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
