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Wednesday, June 30, 2021

HLAA News: HLAA Executive Director Barbara Kelley’s Email Account Hacked

HLAA News: HLAA Executive Director Barbara Kelley’s Email Account Hacked

Link to Hearing Loss Association of America

HLAA Executive Director Barbara Kelley’s Email Account Hacked

Posted: 30 Jun 2021 11:59 AM PDT

Dear HLAA Community, Earlier today (June 30), you may have received a spam email requesting a gift card from HLAA Executive Director Barbara Kelley. This was a spam email–please do not respond....

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What is the content of forging quality inspection?

    The existence of forging defects may affect the processing quality or processing quality of the subsequent processes, and some seriously affect the performance and use of the forgings, and even greatly reduce the service life of the finished parts and endanger safety. Therefore, in order to ensure or improve the quality of cold forgings, in addition to strengthening quality control in the process and taking corresponding measures to prevent the occurrence of forging defects, necessary quality inspections should also be carried out to prevent subsequent processes (such as heat treatment, surface treatment, cold processing, etc.). ) And forgings with defects that have adverse effects on performance will flow into the subsequent process. After quality inspection, remedial measures can be taken on the forgings made according to the nature of the defect and the degree of influence to use, so that it meets the technical standards or requirements for use. Therefore, in a sense, the quality inspection of forgings, on the one hand, is to check the quality of the forgings that have been made, and on the other hand, to point out the improvement direction for the forging process, so as to ensure that the quality of forgings meets the requirements of forging technical standards and meets the design Requirements on processing and use.

 

Forging

  The quality inspection of hot forgings includes the inspection of appearance quality and internal quality. Appearance quality inspection mainly refers to the inspection of the geometric size, shape, surface condition and other items of the forging; the internal quality inspection mainly refers to the inspection of various items such as the chemical composition, macrostructure, microstructure and mechanical properties of the forging. Specifically, the appearance quality inspection of forgings is to check whether the shape and geometric dimensions of the forgings meet the specifications of the drawings, whether the forgings have defects on the surface, what kind of defects are they, and what are their morphological characteristics. The inspection content of the surface condition is generally to check whether the forging surface has surface cracks, folds, wrinkles, pits, orange peel, blisters, scars, corrosion pits, bruises, foreign objects, underfill, pits, lack of meat, Defects such as scratches. The internal quality inspection is to check the internal quality of the forging itself. It is a quality condition that cannot be found by the appearance quality inspection. It includes the inspection of the internal defects of the forgings and the inspection of the mechanical properties of the forgings. Parts or large metal forgings should also be subjected to chemical composition analysis.

 

Forging

  For internal defects, we will use low-power inspection, fracture inspection, and high-power inspection to inspect the forgings for the presence of internal cracks, shrinkage holes, porosity, coarse crystals, white spots, dendrites, and streamlines that do not conform to the shape, Defects such as streamline turbulence, penetrating flow, coarse crystal ring, oxide film, delamination, overheating, overburning organization, etc. For the mechanical properties, it is mainly to check the normal temperature tensile strength, plasticity, toughness, hardness, fatigue strength, high temperature instantaneous rupture strength, high temperature permanent strength, permanent plasticity and high temperature creep strength.

  After the forgings are produced into rigging, their stress conditions, importance, and working conditions are different during use, and the materials and metallurgical forging used are also different. Therefore, different departments will classify forgings according to the above conditions and the requirements of the department. , Different departments and different standards have different classifications of forgings.

Copyright notice: This article comes from  https://beautyblog.top/

 

Please keep the source and address of this article for reprinting: https://beautyblog.top/what-is-the-content-of-forging-quality-inspection/

 

 


Talking about the Application of Beryllium Copper in Plastic Mould

Nowadays, more and more beryllium copper mold materials have been used in the manufacture of plastic molds, and there is a rising trend. What is the reason for this phenomenon? Let me learn about the use of beryllium copper in plastic molds with the editor, and why.

 

1. Sufficient hardness and strength: After many tests, engineers can find out and master the hardening conditions and working conditions of beryllium copper machining alloy precipitation and the mass characteristics of beryllium copper (this is the point that the beryllium copper alloy is based on A prelude to the application of formal products in the market); beryllium copper materials need to go through multiple cycles of tests before they are used in plastic molds to finally determine the physical properties and chemical components that meet the manufacturing and processing; the proof of theory and practice-beryllium When the hardness of copper is hrc36-42, it can reach the hardness, strength, high thermal conductivity required for tungsten die manufacturing, simple and convenient machining, long mold life, and save development and production cycle.

 

2. Good thermal conductivity: The thermal conductivity of beryllium copper material is beneficial to control the temperature of the plastic machining mold, and it is also easier to control the molding cycle, while ensuring the uniformity of the mold wall temperature; if compared with the steel mold, the molding of beryllium copper The cycle is much smaller, and the average temperature of the mold can be reduced by about 20%. When the difference between the average ejection temperature and the average wall temperature of the mold is small (for example, when the mold parts are not easy to be cooled), use the beryllium copper mold material to cool The time can be reduced by 40%. The mold wall temperature is only reduced by 15%; the characteristics of the above beryllium copper mold materials will bring several benefits to the mold manufacturers using this material to shorten the molding cycle and increase the productivity; the uniformity of the mold wall temperature improves the quality of the drawn products; The mold structure is simplified because the cooling pipes are reduced; the temperature of the material can be increased, thereby reducing the wall thickness of the product and reducing the cost of the product.

 

3. Long service life of the mold: Budgeting the cost of the mold and the continuity of production, the expected service life of the mold is very important for the manufacturer. When the strength and hardness of the beryllium copper meet the requirements, the temperature of the beryllium copper Stress insensitivity can greatly improve the service life of the mold. Before determining the use of beryllium copper mold materials, the yield strength, elastic modulus, thermal conductivity and temperature expansion coefficient of beryllium copper should also be considered. The resistance of beryllium copper to thermal stress is much stronger than that of die steel. From this point of view, the service life of beryllium copper is remarkable!

 

4. High thermal penetration rate: In addition to the thermal conductivity of the pull, the thermal penetration rate of the powder metallurgy mold material is also very important to the plastic products. On the mold using beryllium bronze, the traces of overheating can be eliminated. If the thermal penetration rate is low, The contact temperature of the distal region of the mold wall will be higher, which will increase the temperature difference of the mold, and in extreme cases will cause the temperature of the region to change from the sink mark at one end of the plastic product to the trace of overheated product at the other end .

 

5. Excellent surface quality: beryllium copper is very suitable for surface finishing and can be directly electroplated, and the adhesion performance is very good, and the polishing treatment of beryllium copper is also very easy.

Copyright notice: This article comes from https://led-heatsink.net/

Please keep the source and address of this article for reprinting: https://led-heatsink.net/talking-about-the-application-of-beryllium-copper-in-plastic-mould/

 

 


Tuesday, June 29, 2021

What are the advantages of CNC turning and milling processing?


Compared with conventional CNC titanium machining processes, the outstanding advantages of turning-milling combined machining are mainly manifested in the following aspects:

 

(1) CNC turning and milling compound processing manufacturers introduced to shorten the product manufacturing process chain and improve production efficiency. A variety of special tools can be installed, new tool arrangement, reduce tool change time, improve processing efficiency, turning-milling composite processing can complete all or most of the machining procedures in one clamping, thus greatly shortening the product manufacturing process chain. In this way, on the one hand, the production assistance time caused by the change of the installation card is reduced, and the manufacturing cycle and waiting time of the tooling fixture are also reduced, which can significantly improve the production efficiency.

 

(2) Reduce the number of clamping and improve cnc brass machining accuracy. The reduction in the number of card loading avoids the accumulation of errors due to the conversion of positioning benchmarks. CNC turning-milling composite processing manufacturers analyze, at the same time, most of the current turning-milling composite processing equipment has the function of online detection, which can realize the in-position detection and precision control of key data in the manufacturing process, thereby improving the processing accuracy of the product; high-strength integration The design of the machine bed improves the gravity processing ability for difficult-to-cut materials; the machine is equipped with an automatic feeding device, which can realize automatic feeding and continuous, basically realizing the assembly line operation of a single machine tool.

 

(3) Reduce floor space and reduce production costs.

 

CNC delrin machining composite processing manufacturers analyze that the compact and beautiful appearance design improves the use of space, and makes maintenance and repair more convenient, so that customers can get the greatest satisfaction; although the single unit price of the turning-milling composite processing equipment is relatively high, but due to the manufacturing process chain The shortening and the reduction of the equipment required for the product, as well as the reduction of the number of fixtures, workshop area and equipment maintenance costs, can effectively reduce the overall fixed asset investment, production operation and management costs.

 

Copyright notice: This article comes fromhttps://tungusten.com/

Please keep the source and address of this article for reprinting: https://tungusten.com/what-are-the-advantages-of-cnc-turning-and-milling-processing/


Various parts of precision CNC machining


1. Parts with high precision requirements

 

The precision requirements of precision CNC machining parts mainly refer to the precision requirements of size, shape, position and surface, and the surface precision mainly refers to the surface roughness. Because the CNC lathe has good rigidity, high precision in manufacturing and tool setting, and can easily and accurately perform manual compensation and automatic compensation, it can process shaft parts with high dimensional accuracy. In some cases, it can achieve the effect of turning instead of grinding. In addition, because the motion of the CNC lathe is realized by high-precision interpolation and servo drive, it can process parts with high shape accuracy requirements such as straightness, roundness, and cylindricity.

 

Because the CNC lathe can complete a lot of processing content in one clamping, it can effectively improve the position accuracy of the parts, and the processing quality is stable. The CNC lathe has the function of cutting at constant linear speed, so it can not only cnc machine parts with small and uniform surface roughness, but also suitable for turning parts with different surface roughness requirements. Generally, the machining accuracy of CNC lathes can reach 0.001mm, and the surface roughness Ra can reach 0.16μm (precision CNC lathes can reach 0.02μm).

 

2. Parts with small surface roughness values

 

The precision CNC machining numerical control lathe has a constant linear speed cutting function, which can machine parts with small and uniform surface roughness values. The problem is that the surface roughness depends on the feed rate and cutting speed when the material, the finishing allowance and the tool have been determined. The cutting speed changes, resulting in inconsistent surface roughness after turning. Using the constant line cutting function of the CNC lathe, you can choose the best line speed to cut cones, spheres and end faces, so that the surface roughness values ​​after turning are small and consistent. .

 

3. Parts with complex surface contour shapes

 

Because the precision  titanium machining CNC lathe has linear and circular interpolation functions (some CNC lathes also have some non-arc curve interpolation functions), it can turn complex shapes composed of arbitrary straight lines and various flat curves. Body parts, including list curves that cannot be described by equations that are processed by fitting calculations. As shown in Figure 4-1, the molding surface of the closed cavity of the shell part cannot be machined on an ordinary lathe, but it can be easily machined on a CNC lathe.

 

Copyright notice: This article comes from  https://lasercutting.top/

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What is the content of forging quality inspection?

 The existence of forging defects may affect the processing quality or processing quality of the subsequent processes, and some seriously affect the performance and use of the forgings, and even greatly reduce the service life of the finished parts and endanger safety. Therefore, in order to ensure or improve the quality of cold forgings, in addition to strengthening quality control in the process and taking corresponding measures to prevent the occurrence of forging defects, necessary quality inspections should also be carried out to prevent subsequent processes (such as heat treatment, surface treatment, cold processing, etc.). ) And forgings with defects that have adverse effects on performance will flow into the subsequent process. After quality inspection, remedial measures can be taken on the forgings made according to the nature of the defect and the degree of influence to use, so that it meets the technical standards or requirements for use. Therefore, in a sense, the quality inspection of forgings, on the one hand, is to check the quality of the forgings that have been made, and on the other hand, to point out the improvement direction for the forging process, so as to ensure that the quality of forgings meets the requirements of forging technical standards and meets the design Requirements on processing and use.

 

Forging

  The quality inspection of hot forgings includes the inspection of appearance quality and internal quality. Appearance quality inspection mainly refers to the inspection of the geometric size, shape, surface condition and other items of the forging; the internal quality inspection mainly refers to the inspection of various items such as the chemical composition, macrostructure, microstructure and mechanical properties of the forging. Specifically, the appearance quality inspection of forgings is to check whether the shape and geometric dimensions of the forgings meet the specifications of the drawings, whether the forgings have defects on the surface, what kind of defects are they, and what are their morphological characteristics. The inspection content of the surface condition is generally to check whether the forging surface has surface cracks, folds, wrinkles, pits, orange peel, blisters, scars, corrosion pits, bruises, foreign objects, underfill, pits, lack of meat, Defects such as scratches. The internal quality inspection is to check the internal quality of the forging itself. It is a quality condition that cannot be found by the appearance quality inspection. It includes the inspection of the internal defects of the forgings and the inspection of the mechanical properties of the forgings. Parts or large metal forgings should also be subjected to chemical composition analysis.

 

Forging

  For internal defects, we will use low-power inspection, fracture inspection, and high-power inspection to inspect the forgings for the presence of internal cracks, shrinkage holes, porosity, coarse crystals, white spots, dendrites, and streamlines that do not conform to the shape, Defects such as streamline turbulence, penetrating flow, coarse crystal ring, oxide film, delamination, overheating, overburning organization, etc. For the mechanical properties, it is mainly to check the normal temperature tensile strength, plasticity, toughness, hardness, fatigue strength, high temperature instantaneous rupture strength, high temperature permanent strength, permanent plasticity and high temperature creep strength.

  After the forgings are produced into rigging, their stress conditions, importance, and working conditions are different during use, and the materials and metallurgical forging used are also different. Therefore, different departments will classify forgings according to the above conditions and the requirements of the department. , Different departments and different standards have different classifications of forgings.

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Tuesday, June 22, 2021

HLAA News: “Overcoming Hearing Loss” – The Latest Podcast from The People’s Pharmacy

HLAA News: “Overcoming Hearing Loss” – The Latest Podcast from The People’s Pharmacy

Link to Hearing Loss Association of America

“Overcoming Hearing Loss” – The Latest Podcast from The People’s Pharmacy

Posted: 22 Jun 2021 10:13 AM PDT

Barbara Kelley is the executive director of the Hearing Loss Association of America. She can be reached at bkelley@hearingloss.org. Follow her on Twitter @Bkelley_HLAA. When the producer of NPR's...

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Tuesday, June 15, 2021

Imported CNC lathe processing machine tool equipment and debugging

After the CNC machine tool is produced by the manufacturer, the machine tool has been subjected to various requirements and inspections, and only after passing the inspection, can it leave the factory. Regarding medium and large CNC machine tools, because the machine tools are large in size and not convenient for transportation, they must be distinguished and transported to the user after they collapse before they can be used before they can be reassembled and debugged. As for small machine tools, the float level gauge does not need to crash the machine tool during transportation, so the installation, debugging and acceptance tasks of the machine tool are relatively simple.

 

After the machine is transported to the user, it can be put into operation formally after simple connection, adjustment of the machine level and trial cutting, and the things required are relatively simple. The following introduces the equipment, debugging and acceptance requirements of small CNC machine tools.

 

First, the initial installation content of imported CNC lathe processing machine tools includes: according to the requirements of the machine tool, select the appropriate position to place the machine tool; read the material of the machine tool to ensure the accurate use of the CNC machine tool.

  

2. Wire connection processed by imported CNC lathes: This part of the content is mainly the main power connection of the machine tool. Although the step of the magnetic cnc milling column level gauge is very simple, if this step is not done well, it will cause unnecessary troubles, or even Severe results will occur. Here are some considerations for power connection:

  

1. Confirm the input power voltage and frequency. The current voltage power supply in our country is: three-order AC 380V; single-phase 220V. Domestic machine tools generally use three-phase 380V, frequency 50Hz power supply, and some imported machine tools do not use three-order AC 380V, frequency 50Hz power supply, and these cnc bending machine tools are equipped with power transformers, and users can choose according to the requirements. The next step is to reflect on the up and down fluctuations of the power supply, whether the glass tube level gauge can meet the requirements of the machine tool, whether there is a large fluctuation in the vicinity of the machine tool that can affect the power supply, if the voltage fluctuation is too large or there is a large-scale equipment, a stabilizer should be installed , Because the power supply does not fluctuate and the electrical disturbance occurs, the machine tool will affect the invariance of the machine tool.

  

2. The phase sequence of the power supply processed by the imported CNC training is confirmed. When the phase sequence is wrong, there is a fuse that can blow the control unit. The method of reflecting the phase sequence is relatively simple. Use the phase sequence to connect to the following figure to measure, when the phase sequence table is in sequence When the hour hand is twisted, the phase sequence is accurate. Otherwise, the phase sequence is wrong. At this time, you only need to swap any two power cords in the UVW three-phase.


Dimensional control skills for stainless steel parts processing


Modify tool offset value to ensure dimensional accuracy

 

According to stainless steel parts machining manufacturers, when the workpiece error exceeds the workpiece tolerance due to the first tool setting error or other reasons, and the processing requirements cannot be met, the workpiece can be modified to achieve the required size by modifying the tool compensation. The method to ensure the radial size is as follows:

 

Absolute coordinate input method

 

According to the principle of "large reduction, small increase", modify the tool compensation at 001004. If the workpiece size is larger by 0.1mm when cutting the groove with the No. 2 cutting tool, and the tool compensation display at 002 is X3.8, you can enter X3.7 to reduce the No. 2 tool compensation.

 

Relative coordinate method

 

As in the above example, input U-0.1 at 002 cutter compensation, and the same effect can also be obtained.

The same is true for the cnc operating of the axial size. For example, if you use the No. 1 external tool to machine a certain shaft segment, and the size is longer than 0.1mm, you can enter W0.1 at the 001 tool offset.

 

Semi-finish machining eliminates the influence of screw gap to ensure dimensional accuracy

 

According to the analysis of stainless steel parts processing manufacturers, for most CNC machining, after a long period of use, due to the influence of the screw gap, the size of the processed workpiece often appears unstable. At this time, we can perform a semi-finishing process after roughing to eliminate the influence of screw clearance. For example, after rough machining the outer circle with No. 1 tool G71, you can input U0.3 at 001 tool compensation and call G70 fine turning once. After stopping the measurement, input U-0.3 at 001 tool compensation and call G70 fine turning again. . After this semi-finished turning, the influence of the screw gap is eliminated, and the stability of the dimensional accuracy is ensured.


What is the reason for the high temperature of the die-casting mold?

In the process of using the die-casting mold, we need to understand the reason why the temperature of the die-casting mold becomes higher, so what is the specific reason? Let's take a look together below.

Many accessories used by people in daily life are manufactured by die-casting molds, so this mold technology is in great demand in the market. In the shopping malls, due to the increase in demand, the development of Kaiping die-casting manufacturers has gradually expanded along with the economy. However, what is the result of the high surface temperature of the die-casting mold? Here is a brief introduction to the problem, hoping to bring help to those in need.
Casting standards will be affected: the surface temperature of the die-casting mold is closely related to the standard accuracy of the casting. If the surface temperature does not meet the requirements or the temperature spread is unreasonable, the casting will have poor standard accuracy due to uneven heating. The phenomenon appears. So from this perspective, the temperature issue must be paid attention to.
The appearance of the casting will be affected: the surface temperature of the die casting mold will definitely affect the appearance of the casting. If the temperature is unreasonable, it will simply cause severe deformation of the casting, such as unevenness and shrinkage. It is necessary to know that the impact of appearance will have a great impact on product sales, so the appearance quality of castings must be paid attention to.
Standard accuracy and appearance quality will be greatly affected, which is caused by the surface temperature of the die-casting mold, so people must control the surface temperature of the mold at any time during processing.

T Copyright notice: This article comes from https://diecastingmanufacturer.com/

Please keep the source and address of this article for reprinting: https://diecastingmanufacturer.com/what-is-the-reason-for-the-high-temperature-of-the-die-casting-mold/

 


Thursday, June 10, 2021

Knowledge of aluminum processing technology

Aluminum is the most widely used and widely used metal material among non-ferrous metals, and its application range is still expanding. There are many kinds of aluminum products produced using aluminum, and there are more than 700,000 types according to statistics. Various industries such as construction and decoration, transportation, and aerospace have different needs. Today I will introduce to you the processing technology of aluminum products and how to avoid processing deformation.

Wednesday, June 9, 2021

HLAA News: HLAA Joins Consumers Commenting on FCC Rules

HLAA News: HLAA Joins Consumers Commenting on FCC Rules

Link to Hearing Loss Association of America

HLAA Joins Consumers Commenting on FCC Rules

Posted: 08 Jun 2021 02:46 PM PDT

HLAA signed onto comments drafted in concert with TDI (Telecommunications for the Deaf and Hard of Hearing) and other Accessibility Advocacy Organizations and Research Organizations that were filed...

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Monday, June 7, 2021

What are the requirements for the runners of die-casting molds?

The runners of die-casting molds have corresponding requirements, so we need to understand these requirements as much as possible, which is of great help for us to use die-casting molds.

Sunday, June 6, 2021

Die casting mold stress

During the use of die-casting mold, the die-casting mold will have stress. So what is the reason for this situation? Let's take a look at the causes of stress in the lower die-casting mold.

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Wednesday, June 2, 2021

What should I pay attention to in the die casting of aluminum alloy?

Aluminum alloy die-casting products are mainly used in electronics, cars, motors, and some communication industries. Of course, the primary use is still in the parts of some equipment. So what should we pay attention to in the die-casting of aluminum alloy?

 

1. Consider the issue of demolding,

 

2. Considering the wall thickness of aluminum alloy die-casting, too much thickness will affect the filling

 

3. In the structure, try to avoid the appearance of the structure that causes the mold structure to be messy, and have to use multiple core pulling or spiral core pulling

 

4. The appearance of some die castings may have special requirements, such as oil injection

 

5. Consider the mold problem when designing. Assuming there are multiple orientations of core-pulling positions, try to put both ends, preferably not in the lower position of the core-pulling, so that the aluminum alloy die-casting will cause problems with the core-pulling.

 

Pay special attention to the following points in the use of aluminum alloy die-casting molds:

 

1. It is very troublesome to organize the parting surface of the mold, and it is also very simple to ignore. Assuming that the boss has a high starting point and buys a good mold, then the job is much easier. If the quality of the mold is not good, it is produced. It is inevitable that there will be flashes or dirt on the parting surface of the mold. The operator should always tidy up these parts and equip a small spatula at any time.

 

Assuming that the flash is not removed in time, the parting surface of the mold is simply collapsed, and the aluminum is formed in the production process. Once this result is formed, no matter how good a mold repair expert you are, the possibility of complete repair is very small. Yes, it's not that they don't have the skills.

 

 

 

The emergence of the achievements made by running aluminum not only increases the cost of die-casting, wastes the aluminum in vain, and the product quality is also unstable, especially the internal quality. It also increases the difficulty of confirming the process parameters, and the pass rate will drop a lot. From safety considerations, Increased the chance of work-related injuries.

 

During the shift, the operator thoroughly cleans the parting surface of the mold with kerosene, which not only prevents the mold from being crushed, but also after cleaning, the mold can be blocked by the residue of the release agent or other dirt. The exhaust groove is opened, which is conducive to the discharge of the gas in the cavity during the injection process to advance the product quality. It is advisable for a team to clean the parting surface twice. Let employees develop an outstanding habit.

 

2. When each team takes over, check carefully according to the "Mold Check List" of our company, and solve the problems in time to avoid unnecessary troubles for themselves.

 

3. Application of mold cooling system. When the mold cooling water is used correctly, it not only extends the service life of the mold, but also improves the metal machining efficiency. In actual production, we often neglect its importance. The operators also try to save energy. If it is too troublesome to connect and connect, they will not connect the cooling water pipe. Some companies even save the cost when customizing the mold. Cooling water then constitutes a very serious result.

 

The material of the mold is generally made of special mold steel through various treatments, and even the best mold steel has its limits of use, such as temperature. When the mold is in use, assuming that the mold temperature is too high, it is very simple that tortoise cracks appear on the surface of the mold core early, and some molds even have large areas of tortoise cracks before they exceed 2000 times.

 

Even during the production of the mold, the color of the mold core changed because the mold temperature was too high. After measurement, it even reached more than 400 degrees. When this temperature is quenched by the release agent, it is very easy to crack, and the product is produced. It is also briefly deformed, strained, sticky and other conditions appear.

 

Under the condition of using mold cooling water, the use of mold release agent can be greatly reduced, so that the operator will not use mold release agent to lower the temperature of the mold. The advantage is that it can effectively extend the life of the mold, save the die-casting cycle, improve the quality of the product, reduce the occurrence of mold sticking, strain and aluminum sticking, and reduce the use of mold release agents. It can also reduce the loss of ejector pins and cores due to overheating of the mold.

 

4. It is necessary to preheat the mold during the initial production machining to avoid the occurrence of turtle cracks when the cold mold suddenly encounters hot molten metal. The messy mold can use blowtorch and liquefied gas, and the conditions are good. For the mold temperature machine, the simpler mold can be preheated by slow injection.

 

5. Assuming that the mold is equipped with neutron control, be careful to prevent the signal line between the die casting machine and the mold from being connected. The reason is very clear. In daily production, it is difficult to avoid water on the signal line, which may be caused by the joints. The local is simply broken.

 

Then the composition is short-circuited with the machine tool. If a signal error is formed, it will alarm and proactively stop and delay the time, or the signal will be disordered and the mold will be broken. Constitute unnecessary discards. Pay attention to the waterproof of the travel switch.


Tuesday, June 1, 2021

CNC turning and milling composite processing manufacturers explain the selection of lathes


1. Preparation

 

The CNC turning and milling composite processing manufacturer introduced the process requirements of typical parts and the batch of processed workpieces. The function that the CNC lathe should have is to make preparations and the prerequisites for the reasonable selection of CNC lathes. Meet the process requirements of typical parts

 

The process requirements of typical parts are mainly the structural size, processing range and accuracy requirements of the parts. According to the accuracy requirements, that is, the dimensional accuracy, positioning accuracy and surface roughness of the workpiece, the control accuracy of the CNC lathe is selected.

 

Choose based on reliability. Reliability is a guarantee for improving product quality and production efficiency. The reliability of a CNC machine tool means that the machine tool runs stably for a long time without failure when it performs its functions under specified conditions. That is, the mean time between failures is long, even if there is a failure, it can be restored in a short time and put into use again. Choose machine tools with reasonable structure, well-manufactured, and mass-produced machines. Generally, the more users, the higher the reliability of the CNC system.

 

2. Purchase of machine tool accessories and tools

 

According to the analysis of CNC turning-milling composite processing manufacturers, the machine tool accessories, spare parts and their supply capacity, and cutting tools are very important to the CNC machining and turning centers that have been put into production. When choosing a machine tool, carefully consider the compatibility of tools and accessories.

 

3. Focus on the identity of the control system

 Manufacturers generally choose products from the same manufacturer, and should at least purchase control systems from the same manufacturer, which brings great convenience to the maintenance work. Teaching units require students to be knowledgeable and knowledgeable, so it is a wise choice to choose different systems and equip them with various simulation software.

 

4. Choose according to the performance-price ratio

 Introduced by CNC turning-milling composite machining manufacturers, to ensure that the functions and accuracy are not idle, not wasted, and do not choose functions that are not related to your needs.


Introduction to the method of aluminum alloy die casting to solve casting porosity

Method to solve casting porosity

 

First analyze the reasons for the formation of stomata, and then take corresponding measures.

 

(1) Choose dry and clean alloy materials.

 

(2) Do not overheat or degas the melt under control.

 

(3) Reasonably choose the casting process parameters, especially the injection speed. The starting point for speed-regulating high-speed machining.

 

(4) Sequential filling helps to discharge the cavity gas. Pouring I: 1, and the runner has sufficient length. It should be 50 ram, which is conducive to the smooth flow of alloy liquid and gas discharge.

 

The thickness and direction of I:1 can be changed, and overflow grooves and exhaust grooves are set at the holes. The sum of the cross-sectional area of ​​the overflow product is not less than 60% of the sum of the cross-sectional area of ​​the gate part, otherwise the slag discharge effect will be poor.

 

(5) Choose good performance paint and spray volume control.

 

Choose the right die casting machine

 

 

 

Die-casting machine is the key equipment for die-casting production, and its performance objectively determines the quality of die-casting parts. The correct choice of die-casting machine is essential to ensure product quality, improve production efficiency and reduce production costs. The performance of the die casting machine depends on two aspects.

 

Sufficient clamping force: to prevent the flow pressure of the molten metal from reaching high peaks, and to prevent flashing and flying materials.

 

Sufficient injection capacity: to ensure that the stand casting process will not cause overheating or a large amount of overflow of the mold, and at the same time ensure that the machine has enough capacity to transport enough molten metal and fill the cavity as required to accelerate the speed in a short time.

 

Design of Die Casting Mould Runner

 

Because the zinc alloy must fill the cavity in a short time, the design and manufacturing of the die-casting mold and its runner system are much higher than that of the plastic mold.

 

The runner system guides the metal solution to fill the cavity in some way. It plays an important role in the flow direction of the metal liquid, pressure transmission, filling time, exhaust conditions and mold temperature distribution.

 

It is also an important factor that determines the quality of die castings.

 

The design principle of the die-casting mold runner system should be summarized from the gooseneck to the gate to avoid sharp corners, and the runner surface should be smooth to reduce resistance and maintain the flow rate of the liquid zinc alloy.