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Advantage: MIM is the best way to make a lock cylinder. Not only MIM can make various kinds of complex shape parts, but also it can meet the requirements of the size precision. If the tolerance has high demand, after MIM, we need to do extra CNC process. As to the surface, most lock parts have no further requirement, because stainless steel can resist the rust. Its surface is bright enough.

Here we have some experiences on how to make moulds and avoid normal problems in the moulding design.

MIM moulds are generally used to produce small parts, and the size of the moulds is small. Normally, as long as the use area of the template does not exceed 60% of the length and width, and the depth does not exceed 10%, the strength calculation can be ignored. Moreover, the shape of the die and the actual force in the cavity is very complex. Even if there are many assumptions, it is difficult to get the results by elasticity and finite element method. Therefore, the method of enlarging safety factor is often used in die design.

However, for larger products or ultra-high pressure precision forming process, if possible, the cavity strength should be calculated, to prevent overflow or even damage due to insufficient strength. The strength calculation of the simple shape cavity can refer to the design manual of plastic mould. Complex cavity can be analyzed and calculated by finite element method or professional software. In order to ensure the accuracy of products, the following points should be paid attention to in mold design:

1) Rational design of the die magnification factor. On the premise of ensuring smooth forming, the amount of binder should be reduced as much as possible.

2) Reasonable die structure. Precise dimension parts should have a certain hardness degree and be easily replaced. The tolerance must be reasonable. The upper tolerance limit should be adopted for forming 'holes' and the lower tolerance limit for forming 'shafts' should be adopted as far as possible. The parts technological structure should be reasonable to ensure the processing accuracy.

3) To select reasonable gates and location.

4) To select reasonable ejection modes, as far as possible to make ejection uniform and stable, and reduce deformation.

5) Temperature control system should be set up in the die to ensure uniform filling and cooling as far as possible, and to reduce the non-uniformity of density.

6) To choose the cavity quantity and adopt uniform and symmetrical layout as far as possible to ensure balanced filling. Special precision products should minimize the number of cavity.

7) Reasonable clearance to avoid flash and burr.