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Saturday, January 16, 2021

HLAA News: HLAA Appointed to the FCC’s Disability Advisory Committee

HLAA News: HLAA Appointed to the FCC’s Disability Advisory Committee

Link to Hearing Loss Association of America

HLAA Appointed to the FCC’s Disability Advisory Committee

Posted: 16 Jan 2021 07:18 AM PST

HLAA has once again been appointed to sit on the Federal Communications Commission's (FCC's) Disability Advisory Committee (DAC). On January 13, 2021, the FCC released a Public Notice announcing the...

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Friday, January 15, 2021

HLAA News: Veterans Across America Virtual Chapter Meeting – January 19, 2021

HLAA News: Veterans Across America Virtual Chapter Meeting – January 19, 2021

Link to Hearing Loss Association of America

Veterans Across America Virtual Chapter Meeting – January 19, 2021

Posted: 15 Jan 2021 02:32 PM PST

We invite veterans with hearing loss to attend the next Veterans Across America Virtual Chapter Meeting (VAAVC) online using Zoom. Date:  Tuesday, January 19, 2020 Time: 8 p.m. ET, 7 p.m. CT, 6 p.m....

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Tuesday, January 12, 2021

Introduction of KOVAR parts

KOVAR parts are commonly used as metal casing materials in the electronic packaging industry. Because they have a linear expansion coefficient close to that of molybdenum group glass, and can produce less sealing stress during the sealing (melting) process with molybdenum group glass, so To obtain good air-tightness, in order to make the metal tube and shell to achieve air-tight sealing, in the entire sealing process, the annealing process undoubtedly plays an important role as a link between the previous and the next. The internal stress generated during KOVAR  machining also prepares the material structure for the implementation of the subsequent process-the sealing process of the metal parts.

The main purpose of annealing Kovar shell before sealing is to:

(1) Eliminate machining stress.

When Kovar undergoes plastic machining deformation during cold working, about 10% to 15% of the applied energy is converted into internal energy, which is commonly referred to as internal stress, so that the Kovar material structure is in an unstable state. Under this condition, it can be maintained for a long time without significant changes. Once it is heated, a series of changes in structure and properties will occur, and the material structure tends to a stable state. This change in structure and properties, especially changes in the structure of the structure, is reflected on the sealing surface The tensile stress on the molybdenum group glass during high temperature sealing may cause the glass to produce small cracks and leak;

(2) Eliminate work hardening.

In the process of cold working, cnc manufacturing and forming of Kovar parts, due to defects such as grain elongation and grain breakage in the internal material structure, crystal defects and dislocation density increase greatly. The smaller the distance between the dislocation and the dislocation, the greater the interference between each other, and the greater the distortion of the surrounding lattice. Each dislocation line has a stress field, and the dislocation and dislocation pass through each The interaction of the stress field causes the hardness and elasticity of Kovar to increase, while the plasticity decreases, which is work hardening. If the work hardening is not eliminated, the stress field of the interaction between dislocations and dislocations will be broken due to crystal recovery or recrystallization during high-temperature sealing, and the balance will be lost. This also affects the sealing of metal and glass. Certain stress effects;




Alan Lan

Foreign trade manager

General Manager's Office | Wonder Group

13712198704 | 15112807161
info@wonders-group.com
https://beryllium-copper.com/
No 3,Zhengda Road,Shatou Village,Chang'an Town,Dongguan City,Guangdong Province,China


What material is used for medical parts

According to the working characteristics of medical parts, it is required to be resistant to a certain temperature during disinfection (usually high-temperature steam disinfection), not to be rusty, high in strength, hardness (scalpel), and not easy to deform. Generally, stainless steel is selected, and stainless steel has The materials with the above characteristics are martensitic stainless steel, such as 3Cr13 and 4Cr13 martensitic stainless steel and 9Cr18 machining stainless steel spring , etc., and martensitic stainless steel is the cheapest stainless steel, which can meet the requirements of medical equipment.
The heat treatment process is basically quenching + low temperature tempering.

  • 3Cr13 steel quenching temperature 1000~1050°, oil quenching, tempering temperature 150~350°
  • 4Cr13 steel quenching temperature 1050~1100°, oil quenching, tempering temperature 150~350°

When tempering these two kinds of steel, try to choose a higher temperature, such as 300 °, for the need of high temperature disinfection (high temperature disinfection water vapor can reach 300 °)

The quenching temperature of 9Cr18 steel is 1000~1050, oil quenching, tempering temperature is 200~300. Of course, the above mentioned are all kinds of surgical medical machining equipment, injection puncture equipment, plastic surgery equipment, general examination equipment, family planning equipment, orthopedics (Orthopedics) ) Surgical instruments and other materials, such as scalpels (scalpel handles and blades, skin knives, wart peeling knives, lancets, spatulas, razors, dander scrapers, picking knives, front knives, pedicure knives , Manicure knife, scalpel), surgical scissors (ordinary surgical scissors, tissue scissors, comprehensive tissue scissors, suture removal scissors, plaster scissors, dissecting scissors, gauze bandage scissors, educational surgical scissors), various forceps (ordinary hemostatic forceps) , Small blood vessel hemostatic forceps, mosquito hemostatic forceps, tissue forceps, cemented carbide insert needle holders, ordinary needle holders, wound crimping forceps, skin pressure forceps, bullet forceps, gauze peeling forceps, sponge forceps, scarf forceps , Skin tube forceps, instrument forceps), forceps for basic surgery (small vessel forceps, non-invasive forceps, tissue forceps, plastic forceps, needle-holding forceps, health forceps (simple forceps), plucking forceps, tissue forceps, dressing forceps , Dissecting forceps, hemostatic clip), basic surgical needles, hooks (aneurysm needles, probes, hair pushing needles, hair transplanting needles, picking needles, straight-pointed needles for teaching, vein retractors, wound hooks, flat retractors, double-ended retractors , Skin retractors, anatomical hooks), stethoscopes, etc., do not include the machining materials of medical equipment, such as X-ray machines, B-ultrasound, CT, photographic equipment, laboratory equipment, etc. The materials of these overall equipment are based on the technical requirements of the parts of the equipment Different, you can choose from a wide range of varieties.




Alan Lan

Foreign trade manager

General Manager's Office | Wonder Group

13712198704 | 15112807161
info@wonders-group.com
https://beryllium-copper.com/
No 3,Zhengda Road,Shatou Village,Chang'an Town,Dongguan City,Guangdong Province,China


Analysis of Difficulties in Processing of Medical Parts and Devices

90% of medical machining parts and equipment implants are made of Ti6Al-4V titanium alloy, which is derived from light weight, high strength and high biocompatibility. Titanium alloy 6AL-4V has become a commonly used material for medical implant equipment. Titanium alloy 6AL-4V is usually used in the production of hip joints, bone screws, knee joints, bone plates, dental implants, and spine connection components. Titanium alloy has the characteristics of work hardening, the cutting angle is large in the processing process, and the chips produced are thin. A relatively small contact area is formed on the surface.

1. Titanium alloy materials that are difficult to process for medical parts

The high speed laser cutting force during the machining process, combined with the frictional force during chip flow, will comprehensively lead to excessive local cutting heat of the tool. The poor thermal conductivity of titanium alloys prevents the cutting heat from being conducted quickly. As a result, a large amount of cutting heat is concentrated on the cutting edge and the tool surface. High cutting force and cutting heat will comprehensively cause crescent craters and cause rapid tool failure.

The relatively low modulus of elasticity makes titanium alloys more elastic than steel. Therefore, excessive cutting force should be avoided to ensure that the rebound of the workpiece is small. Thin-walled parts have a tendency to deform under tool pressure, causing chatter, friction and even tolerance problems. The key to solving the problem is to ensure the rigidity of the entire system. It is very necessary to use tools with sharp cutting edges and correct geometric shapes. In addition, machining titanium alloys have a tendency to chemically react and alloy with cutting tools at high temperatures, and their chips have a tendency to be welded to the surface of the tool.

2. Reliable and compact machine tool fixture

Medical equipment processing equipment needs to be able to process small and complex parts made of difficult-to-process materials (such as titanium alloy or stainless steel) with high accuracy requirements. For example, processing bone and joint replacement parts is quite complicated. Due to the poor cutting performance of the material being processed, the blank is usually a bar stock-which means that a large amount of metal needs to be removed. As a result, some parts are cast into a shape close to the finished product, but this also adds to the trouble-the need to manufacture complex and expensive fixtures. Another factor that increases processing complexity is the narrow tolerance range.

Medical equipment parts and components have high requirements for material, processing accuracy, and surface finish, which requires high reliability of the processing system. Therefore, extremely high requirements are placed on machine tools, fixtures, cutting tools, and CAM software. Workpieces are usually processed on advanced medical equipment processing equipment such as Swiss automatic lathes, multi-spindle machine tools and rotary tables. These machine tools are mostly characterized by very small size and very compact structure.

The characteristics and requirements of medical device parts processing have undoubtedly promoted the development of processing technology and solutions to improve the competitiveness and production efficiency of small and medium-sized enterprises in machining medical devices.




Alan Lan

Foreign trade manager

General Manager's Office | Wonder Group

13712198704 | 15112807161
info@wonders-group.com
https://beryllium-copper.com/
No 3,Zhengda Road,Shatou Village,Chang'an Town,Dongguan City,Guangdong Province,China


KOVAR parts seal preparation and physical properties

Kovar® is a vacuum-melted iron-nickel-cobalt low-expansion alloy. The chemical composition content is controlled in a very narrow range to ensure accurate and balanced thermal expansion performance. At the same time, strict quality control during the manufacturing process of KOVAR machining parts also ensures balance Its physical and mechanical properties are more suitable for deep drawing, stamping and various cutting processes.

Material use

Kovar® is used for vacuum sealing of hard glass and ceramics, and is widely used in electron tubes, microwave tubes, transistors and diodes. On integrated circuits, it is used for flat integrated circuits and dual in-line packages.

Seal preparation

All parts made by Kovar® should be degassed and annealed in a wet hydrogen atmosphere. Hydrogen is injected into water at room temperature and gets wet through blisters. Care must be taken to prevent surface carbonization. The heat treatment furnace must have a cooling chamber that provides the same atmosphere. The heat treatment is carried out in the temperature range of 1540/2010°F (838/1099°C). The heat treatment time starts from a low temperature and rises to a high temperature in 20 minutes. Then the parts are moved to the cooling zone and cooled to 570°F (299° C) Then take it out.

When sealing between metal and hard glass, it is recommended that the metal has an oxide film. The preferred oxide film is thin and tightly adsorbed on the metal surface treatment. Such an oxide film can be heated to 1200/1290°F (650/700°C) in an atmospheric environment and continue for a period of time until the dark gray surface layer turns into a light brown oxide film.

  • Physical properties
  • The proportion is 8.36;
  • Density 0.3020lb/in3;
  • Thermal conductivity 120.0 BTU-in/hr/ft²/°F;
  • Elasticity coefficient (E) 20.0 x 103 ksi;
  • Resistance (70.0°F) 294.0 ohm-cir-mil/ft;
  • Curie temperature 815°F;
  • The melting point is 2640°F.
  • magnetic

Kovar alloy machining are magnetic below the Curie temperature, and the magnetic properties depend on heat treatment. The smaller the hardness, the higher the permeability and the smaller the hysteresis loss.




Alan Lan

Foreign trade manager

General Manager's Office | Wonder Group

13712198704 | 15112807161
info@wonders-group.com
https://beryllium-copper.com/
No 3,Zhengda Road,Shatou Village,Chang'an Town,Dongguan City,Guangdong Province,China


Do you know how to test the processing density of metal parts?

Metal parts processing density tester KW-300A, metal parts, refers to the collective name of various specifications and shapes of metal blocks, metal rods, metal tubes, etc. made of metal materials. In the production process, density is very important. One of the physical properties is that manufacturers need to strictly control the density of products.

KW-300A is a precision instrument composed of electronic machining balance, density software, density accessories, etc. It can quickly and conveniently measure the density of solids of various shapes, equipped with professional measuring accessories and transparent sinks. It is easy to carry, simple to operate, powerful, high precision and repeatable.

  • KW-300A parameters and features:
  • Weighing range: 0.005g~ 300g
  • Density/specific gravity accuracy: 0.001 g/cm3
  • Test time is about 5 seconds;
  • Display value density, volume temperature compensation;
  • Solution temperature can be set to 0~100℃/auto;
  • Compensation solution The compensation solution can be set to 19.999.

Directly read the density and volume of solid blocks, particles, and floating bodies of any shape with a density of >1 or <1, ​​with temperature compensation setting and solution compensation setting functions, more user-friendly operation, and more in line with the needs of field operations. The density measuring table is integrated by injection molding, which is convenient and quick to install and has a longer use time.

The one-piece anti-corrosion large sink design is adopted to reduce the error caused by the buoyancy of the hanging railing line, and it is also convenient to test larger bulk objects.

With the function of upper and lower density limits, it can judge whether the specific gravity of the test object is qualified or not. Equipped with buzzer device.

Built-in battery, equipped with windshield, more suitable for on-site testing. Applicable to: rubber, wire and cable, aluminum products, plastic particles, powder metallurgy, mineral rock, precision ceramics, glass industry, metal products, precision ceramics, refractory materials, magnetic materials, alloy materials, mechanical parts, metal recycling, minerals and Research laboratories for new materials such as rock, cement manufacturing, and jewelry industries.



Alan Lan

Foreign trade manager

General Manager's Office | Wonder Group

13712198704 | 15112807161
info@wonders-group.com
https://beryllium-copper.com/
No 3,Zhengda Road,Shatou Village,Chang'an Town,Dongguan City,Guangdong Province,China