粉末射出

INTRODUCTION of MIM PROCESS

Metal injection molding (MIM) is a technology that combines the strengths of conventional powder metallurgy and plastic injection molding. It is the most cost-effective process in making small parts with complicated shapes.

The process starts with kneading fine metal powders and thermoplastic binders. The kneaded feedstock is then granulated and fed into injection molding machine. Under pressure and heat, the feedstock flows into the mold cavity forming the desired shapes. After being removed from the mold, the molded parts go through a debinding process to remove the binders. The debound parts are then sintered to a density greater than 95%

process :
Metal powder → Kneading → Injection Molding → Debinding and Sintering (machining) → Finished part →

Process information about MIM
tooling detail no. of cavities 1~8
tooling life time per cavity 200000 shots
cleaning interval after every production
molding process temp. 80~185
hydraulic injection pressure 500~1500 bar
process name of injection molding machine ARBURG ; FANUC
name of sintering oven Shimadzu
process time injection 30 second
debinding 12Hr ~ 24Hr
sintering  18Hr ~ 24Hr
other process (total in days) 7~14
total capacity of injection per day (pcs) 1500~8000
delivery time of optimal batch in days 30~45

MIM-01.jpg
Injection Molding equipment
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Injection Molding Equipment
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Debinding and Sintering Equipment (Japanese Equipment – Shmadzu)
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Debinding and Sintering Equipment (USA Equipment – CVI)
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Size of the parts before and after sintering.
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Photo of the MIM samples

常用材料成分及其機械性質
機械性質 密度 (g/cm3) 抗拉強度 ( MPa ) 伸長率 ( % ) 熱處理前硬度 熱處理後硬度 C% Ni% Mo% Cr% Cu% Others Fe
Fe-2% Ni 7.5 350 20 HRB 85 Max.HRC52 < 0.15 2 - - - - Bal
Fe-8% Ni 7.6 450 25 - - < 0.15 8 - - - - Bal
4650 * 7.5 1500 2 HRC 18~30 Max.HRC55 0.5 2 0.5 - - - Bal
316L 7.4 500 40 HRB 70 - < 0.03 11 2.2 17 - 1.4Mn Bal
440C 7.5 1600 2 - Max.HRC55 1 0.6 0.75 17 - 1.0 Mn / 1.0 Si Bal
17-4PH * 7.5 1200 4 HRC22~33 Max. HRC 38 0.05 4 - 17 4 - Bal
M2 * > 8.0 1800 0.5 - Max. HRC 62 0.9 - 0.5 4 - 2.0V / 6.0W Bal
We still have other materials such as WC, Fe50Ni....Etc.

產品關鍵字 粉末射出零件
production process 成型 / 脫脂 / 燒結 / 震盪研磨 / 加工
features 當產品太複雜且太小而不適合用傳統粉末冶金燒結時, MIM是一個很好的選擇.
material 極細燒結金屬粉末混合塑膠黏著劑 : Fe2Ni, Fe8Ni, 4605, 8640, stainless steel 316, stainless steel 17-4, M2, Tungsten carbide / WC 及其他材料
applications 電子零件, 門鎖系統, 產業機械零件, 汽車零件, 航太零件, 醫療器材零件