Metal Injection Molding
Application Of Metal Injection Molding MIM in The Field Of Intelligent Locks
The MIM part process used in the key parts of the fingerprint lock is a near-net-shaping technology for manufacturing high-quality precision parts. It injects the plasticized mixture of metal powder and its binder into the mold. Manufacture of complex-shaped parts, so that the finished parts have higher precision and durability, and at the same time have the ability of mass production and lower manufacturing costs, with the incomparable advantages of conventional powder metallurgy, machining and precision casting methods.
Advantages of MIM part process over traditional powder metallurgy process
1. The MIM part process can manufacture products with complex shapes and avoid more secondary machining.
2. MIM parts process products have high density, good corrosion resistance, high strength and good ductility.
3. The MIM part process can combine 2 or more PM products into one metal product, saving materials and processes.
Advantages of MIM part technology over machining
1. The process design of MIM parts can save materials and reduce weight.
2. The MIM process can repeatedly crush and use the injected gate material without affecting the product performance, and the material utilization rate is high.
4. The MIM part process forms complex products at one time through the mold, avoiding multiple processing procedures.
5. The MIM part process can manufacture complex-shaped parts of difficult-to-machine materials.
Advantages of MIM part process over precision casting
1. The MIM part process can manufacture thin-walled products, the thinnest can be 0.2mm.
2. The surface roughness of MIM parts process products is better.
3. The MIM part process is more suitable for making fine blind holes and through holes.
4. The MIM part process greatly reduces the workload of secondary machining.
5. The MIM part process can quickly manufacture small parts in large quantities and at low cost.
Metal powder injection molding, abbreviated (MIM) has many similarities in the molding process, but metal powder injection molding also has special processing such as degreasing and sintering. Powder: The so-called powder metal material is obtained by metal atomization, which includes steel (low alloy, tool steel, stainless steel), super-resistant stainless steel, tungsten, cobalt, titanium, copper, aluminum alloy, and rare metals. Parts processed by metal powder injection molding have higher mechanical properties (tensile strength and elastic modulus) and high temperature resistance, which cannot be achieved by plastic injection molding products. However, due to metal powder (stainless steel metal powder and The price is 90~385 yuan per kilogram) and MIM forming tools are expensive, so it is necessary to reduce the use of expensive metals to make cheaper products. For example: the coordination of investment costs (large-scale products) and processing equipment (reduced use), therefore, in terms of processing relatively small size (thin-walled plastic products) and mass production, metal powder injection molding has the same obvious advantages as plastic injection molding. competitive advantage. During the sintering process of powder particles, with the continuous increase of temperature, the binders (PP, PE, POM) in the products in the early stage are gradually removed, and the particles are combined to achieve a product with a density of 97~99%. , According to the different amount of binder added, the shrinkage rate of the product before and after sintering is also different (10~20%) before, normally 16%. Parts without support areas require fixtures to maintain their shape during sintering. Qinhuangdao Zhongwei Precision Machinery Co., Ltd. is a company specializing in tungsten alloy metal injection molding, titanium alloy metal injection molding, and cemented carbide injection molding. If you have any ideas, you can come to our company for consultation!
What are the general types of metal injection molding molds? Generally, this method is used to process the mold using two parts. One is the cavity, which provides a concave shape. The second is the center of gravity, which gives part of the internal shape. The cost depends on the geometry achieved for the part. As a complex part, the complexity of the mold increases more expensively. In the metal injection molding process, the melt of the injection molding machine is injected into the thermoplastic mold under high pressure. Molten plastic takes shape in a mold, cools and solidifies. The formed part is ejected from the mold. The need for an ejection system pushes up a part of the mold as the part shrinks to the center of gravity as it cools. This is a mold that is generally at the center of gravity with the ejection pins.
Choose materials suitable for precision injection molding. The more important technical indicators for evaluating products are the accuracy of injection molded products (dimensional tolerances, geometric tolerances and surface finish of products). In order to inject precision plastic products, it is necessary to strictly control four major factors, including material selection, mold design, injection molding process, and operator's technical level. The precision injection molding machine requires the dimensional accuracy of the product to be generally ~, and many precision injection molding also requires the injection molding machine to have high injection pressure and high injection speed; the clamping system is required to have sufficient rigidity and high enough clamping accuracy, the so-called clamping accuracy. It refers to the uniformity, adjustment, stability and repeatability of the clamping force, and high precision of the opening and closing position; it is required to accurately control the pressure, flow, temperature, measurement, etc. Injection, to ensure the reproduction conditions of the molding process and the repeatability of the product size, etc. Factors affecting the dimensional accuracy of the product; mold accuracy; molding shrinkage; temperature, humidity and fluctuation range of the environment where the product is used. What is the ultimate goal? High mechanical strength, good dimensional stability, good creep resistance and wide environmental adaptability. There are four commonly used materials: polyoxymethylene (POM) and carbon fiber (CF) reinforced or glass fiber (GF) reinforced POM. This material is characterized by good creep resistance, fatigue resistance, weather resistance, good dielectric properties, flame retardancy, and easy demoulding by adding lubricants. Nylon (PA) and GF reinforced PA66. Features: strong impact resistance and wear resistance, good fluidity, and can be formed. GF reinforced PA66 has higher heat resistance (melting point 250℃).
Yongjia lock metal injection molding advantages
Qinhuangdao Zhongwei Precision Machinery Co., Ltd. focuses on technological innovation and product research and development, and the development scale team continues to grow. The company currently has professional technical staff, provides employees with a broad development platform and growth space, and provides customers with high-quality products and services, which are well received by employees and customers. Qinhuangdao Zhongwei Precision Machinery Co., Ltd.'s main business covers metal injection molding, metal powder injection molding, MIM, adheres to the quality policy of "quality assurance, good service, customer satisfaction", and wins the support and trust of our customers. The company strives to provide customers with all the best services. We believe that honesty, integrity, pioneering and doing the right thing for the company's development will bring common interests and progress to the company and individuals. After several years of development, it has become a well-known enterprise in metal injection molding, metal powder injection molding and MIM industry.