Analysis of Plastic Injection Mold Products for Window Handle spacer plastic injection part

一.Plastic products

1.Process analysis of plastic parts 

 First,this product belong to outer product,the product weight is 0.31g,the material is Acteal,surface polishing need to make high polishng,the customer's request need make 16 cavaties mold.We check the  all request and give the DFM report to customers.

2.Calculate the volume and mass of plastic parts

The calculation of the quality of plastic parts is to select the injection machine and determine the number of cavities.After calculation
The volume of the plastic part is V=1.008. According to Appendix B, the Acteal density is P=1.009g · mm-3, therefore the mass of the plastic part is 0.31g,The mold structure of the first mock examination and two pieces, considering its overall dimensions, the pressure required during injection Force, preliminary selection of HTF90-I injection machine.

3.Determination of process paraeters fmor plastic injection molding

According to Appendix H, the forming process parameters of Nylon can be selected as follows
Barrel temperature: front section 200-210 ℃, middle section 210-300 ℃, rear end 180-200 ℃
Nozzle temperature: 190-200 ℃
Mold temperature: 50-80 ℃
Injection pressure: 70-120MP
Maintaining pressure: 50~70MP
Injection time: 3-5 seconds, holding time 15-30 seconds, cooling time 15-30 seconds
Forming cycle: 40-70s

4.Selection of injection mold parting surface   

In mold design, the selection of the parting surface is crucial as it determines the structure of the mold.The selection of the parting surface should be based on the principles of the parting surface and the forming requirements of the plastic part,The parting method shown in the figure can reduce the complexity of the mold and reduce the number of molds,The processing difficulty of the tool is also convenient for demolding the mold.

5. Principles for selecting parting surfaces:
a. The maximum contour of the plastic part, otherwise the product cannot be taken out
b. Beneficial for smooth demolding of plastic parts and preventing suction of front molds 
c. Beneficial for ensuring the accuracy requirements of plastic parts 
d. Meet the appearance quality requirements of the product 
e. Facilitate the processing and manufacturing of molds