Metal items made MIM stainless steel feed may be sintered due to the MIM process metal injection molding products they use. The surface finish may be relatively rough, with slight burrs, fine MIM stainless steel particles may adhere to Product surface. In order to achieve surface finish (some products even require a mirror effect) deburring requirements, grinding, polishing, sandblasting other surface treatment processes are often added. Here's how to finish MIM stainless steel

1.MIM stainless steel mechanical polishing

MIM stainless steel mechanical polishing is based on cutting plastic deformation of the material surface to remove the polished convex parts to obtain a smooth surface.Generally, you use whetstone strips, wool wheels, sandpaper, etc., mainly manual operations, special parts such as rotary external surface You can use auxiliary tools such as turntables. If the appearance quality is high, you can use ultra-refined polishing. The ultra-precise grinding polishing is a special grinding tool. In the grinding polishing liquid containing abrasives, it is pressed against the surface of the workpiece to be processed for high-speed rotation. Using this technology, the surface roughness of Ra0.008μm can be reached, which is the highest among various polishing methods. Optical lens molds often use this method.

2. MIM stainless steel electrolytic polishing

The basic principle of MIM stainless steel electrolytic polishing is the same as that of chemical polishing, that is, by selectively dissolving the small protruding parts of the material, the appearance is smooth. Compared with chemical polishing, the effect of cathode reflection can be removed, the effect is better.

3. MIM stainless steel fluid polishing

MIM stainless steel fluid polishing is dependent on the high-speed fluid the abrasive particles carried by it to wash the surface of the workpiece to reach the polishing target. Common methods are: abrasive radiation processing, liquid radiation processing, hydrodynamic grinding, etc. Hydrodynamic grinding is driven by hydraulic pressure, which causes the liquid medium carrying abrasive particles to flow back forth across the surface of the workpiece at high speed.

The medium is mainly made of a special compound (polymer-like substance) that flows through at a lower pressure is mixed with an abrasive.The abrasive can be made of silicon carbide powder.

4. MIM stainless steel magnetic grinding polishing

MIM stainless steel magnetic grinding polishing is the use of magnetic abrasive to form an abrasive brush under the action of a magnetic field to grind the workpiece. This method has high processing efficiency, good quality, easy control of processing conditions good working conditions.

At present, the most important polishing methods for parts made by the MIM process are magnetic grinding mechanical polishing. The polishing in plastic mold processing is very different the surface polishing required in other industries. Many of the polishing of the mold can be called mirror processing. It only has high requirements for polishing itself, but also has high standards for surface flatness, smoothness geometric accuracy.