What are some of injection molding process theories you don’t know?

Property of friction between macromolecules when molten plastic flows is called viscosity of plastic, and coefficient of this viscosity is called viscosity, so viscosity is a reflection of fluidity of molten plastic. The larger viscosity, the stronger viscosity of melt, the worse fluidity, the more difficult processing.Comparing fluidity of a plastic is not based on its viscosity value, but on…

Heat treatment is done well, mold processing is less troublesome!

First, causes of mold heat treatment defects and how to prevent Heat treatment of mold includes preliminary heat treatment, final heat treatment, and surface strengthening treatment. Generally, heat treatment defect refers to various defects that occur in final heat treatment process or in subsequent process, such as quenching, deformation, poor hardness, electric machining cracking, grinding…

8 common misunderstandings of precision mold processing

We know that EDM is process of electrolytically etching off workpiece, while electrochemistry is dissolution of workpiece by electrolyte. Relatively speaking, EDM is now very popular. For example, in the manufacture of molds, EDM is an important process. However, some technical misunderstandings in mold factory will cause numerical control EDM to fail to meet expected accuracy, surface,…

In mould processing, if we want to ensure the accuracy of die parts, we need to reserve machining allowance during processing. Machining allowance refers to the difference between the solid size of the workpiece and the size of the drawings. Machining allowance directly affects the quality of the parts. Excessive margin will waste raw materials, increase the consumption of machine tools and other energy; too small margin will easily lead to scrap of work pieces. Therefore, when processing die parts, it is necessary to reserve machining allowance reasonably.

The following is the method of reserving machining allowance in each process of die processing.

1. For workpieces requiring heat treatment, the grinding machine allowance of 0.25mm on one side of the spare material size before heat treatment is added.

2. The core pins and sleeves that needs CNC rough processing, the reserved allowance of one side is 0.2mm;

3. Reserve 0.3-0.5 mm on one side of the rough milling outline, 0.05 mm on the one side of the forming part and 0.1 mm on the one side of the rough outline after line cutting.

4. After CNC finishing and electric pulse polishing, mirror polishing should be done, leaving 0.03mm polishing margin on one side.

In addition to the above methods, we also need to reserve machining allowance according to the actual situation. As long as all links are well done, the processing accuracy of die parts will be guaranteed.

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Above article from KENOS official website (http://www.moldpart-manufacturer.com/)