Introduction to Zhongwei’s precision metal injection molding process
Metal injection molding process referred to as MIM process
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| Qinhuangdao Zhongwei Precision Mechanical Parts Co., Ltd. focuses on the R&D, production and sales of metal injection molding processes. The company cooperates with the powder metallurgy TiAl and Ti alloy research group of the University of Science and Technology Beijing. It has more than 10 years of research and practice in titanium injection molding, and has now batched it. It has been producing parts for 5 years and can provide customers with one-stop service technology companies such as product design and R&D, mold making, finished product processing and assembly. The development of metal powder injection molding (MIM) is very eye-catching. Molding has been used in the ceramics and plastics industries for many years. Only recently has powder been used in the metallurgical industry. The market for metal powder injection molding products is still very limited, but it has a huge potential market. Injection molding is a molding method that also combines molding, so it is also called injection molding. The usual injection molding process is: put the mixed pellets or powder into the barrel of the injection molding machine, and through heating, heat shrinkage, shear mixing and transportation, the materials can achieve uniformity and shadowing effects, and then With the help of a plunger or screw applying pressure to the plasticized mixture, the high-temperature fluid is injected into the pre-closed low-temperature mold cavity through the nozzle in front of the material storage and the runner system of the mold. After cooling and shaping, the mold is opened and ejected. Products, products with a certain geometric shape and precision are obtained. Can provide customers with titanium alloy, stainless steel, alloy steel, copper alloy, and 6061 aluminum alloy part |
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| About MIM: Powder injection molding technology (PIM for short) is a new component forming technology that combines traditional powder metallurgy forming technology and plastic injection molding technology. According to the different raw material powders in the injection molding process, they can be divided into two categories: one is ceramic powder injection molding technology (referred to as CIM), and the other is metal powder injection molding technology (referred to as MIM); metal powder injection molding is simple To put it simply, metal powder fillers are added to plastic, then the plastic is removed, and then the powder is sintered into a whole product. It is a near-net shape process that produces complex parts at a lower cost; MIM products are widely used in smartphones, Consumer electronics fields such as tablets and wearable devices, as well as medical equipment, auto parts and other fields. |
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MIM development history: In the 1970s - the powder injection molding (PIM) process of ceramic spark plugs began to appear; in 1979 - Parmareh metal injection molding products won two awards, and the MIM process attracted attention in the industry; 1986 - --- Japan's Nippon Seison introduced MIM technology, and my country began experimental research on MIM technology; 1990 - Israel's Metalor Company introduced MIM technology and established a MIM production line; 1997~2000 - my country's May 3rd Research Institute , Beijing Iron and Steel Institute and Central South University have successively established MIM companies. MIM technology has gradually been industrialized in my country; from 2000 to 2006 - my country's MIM companies continued to innovate, and the domestic MIM industry showed a year-by-year growth trend; from 2006 to the present - benefited Due to the innovation of feeding technology by BASF in Germany and the widespread application of MIM technology in the field of consumer electronics, the MIM industry entered a period of rapid growth after 2012. |
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| Advantages of metal injection molding MIM: unrestricted structure: complex metal parts can be directly formed like plastic injection molding, allowing free design of three-dimensional shapes. In theory, all shapes that can be molded by plastic can be realized through the MIM process; physical properties are reliable: The product has a uniform structure and good density, and the density can reach more than 98% of the theoretical density. The product has high mechanical properties such as strength, hardness, and elongation; the product has high precision: the dimensional accuracy of the product can reach +/-0.3% in one forming, and the general accuracy requirements The products do not require post-processing; the batch cost advantage is significant: Compared with other processes, especially products with complex structures, the near-net shape process has obvious mass production cost advantages using the MIM process. |
| Metal injection molding MIM process flow: |
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Parameter Description：
MIM product parameter table | |||||||||||
| characteristic | minimum value | maximum value | best advice | ||||||||
| weight | 0.01g | 240g | 0.1~50g | ||||||||
| wall thickness | 0.1mm | 10mm | 0.5~5mm | ||||||||
| annual demand | 50000pcs | million pcs | >100 Thousand pcs | ||||||||
| size/mm | Standard tolerance /mm | Advanced machining tolerances/mm |
| 0-5 | ±0.05 | ±0.025 |
| 5-10 | ±0.07 | ±0.03 |
| 10-20 | ±0.10 | ±0.05 |
| 20-50 | ±0.30 | ±0.10 |
| 50-100 | ±0.50 | ±0.2 |
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