Parts processing methods and processes in the mold industry

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Generally speaking, mold parts processors use the following methods for processing:

• 1. Milling: mainly using a milling cutter to mill the plane
• 2. Grinding: mainly using a grinding wheel to grind the surface of the workpiece.
• 3. Planing: mainly using a planer to plan the surface of the workpiece.
• 4. Special processing: a method of directly using electrical energy, chemical energy, etc. for processing.
• 5. CNC processing: mainly through digital information to control the machine tool, so that the relative movement between the processed parts and the tool meets the requirements, and the parts are processed from the surface.

The processing technology of mold parts generally adopts the following methods:

• 1. Geometric shape accuracy The geometric shape accuracy (roundness, cylindricity) of the journal should generally be limited to the diameter tolerance point range. When the geometric shape accuracy requirements are high, the allowable tolerance can be specified separately on the part drawing.
• 2. Surface roughness Depending on the working part of the surface of the part, there may be different surface roughness values. For example, the surface roughness of the bearing journal of the ordinary machine tool spindle is Ra0.160.63um, and the surface roughness of the matching journal is Ra0.632.5um. With the increase of machine speed and precision, the surface roughness value requirements of shaft parts will become smaller and smaller.
• 3. Dimensional accuracy The journal is the main surface of shaft parts, which affects the rotation accuracy and working state of the shaft. The diameter accuracy of the journal is usually IT69 according to its use requirements, and the precision journal can reach IT5.
• 4. Position accuracy It mainly refers to the coaxiality of the matching journal of the assembled transmission part relative to the supporting journal of the assembled bearing, which is usually expressed by the radial runout of the matching journal to the supporting journal; according to the use requirements, the high-precision shaft is specified to be 0.0010.005mm, while the general precision shaft is 0.010.03mm. In addition, there are requirements for the coaxiality of the inner and outer cylindrical surfaces and the perpendicularity of the axial positioning end face and the axis centerline.