Ms. Jenny Wang
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Zhejiang Ceeto Mold Co.,Ltd.
We have been dedicated plastic injection molds design and manufacturing for many years and we have rich experience to summarize the following critical principles to be considered during plastic injection molds design works.
01-Clamping force consideration
Lateral clamping force is small, regarding big plastic components which has large projected area, the direction with large projected area should be placed on direction of opening and closing of the front plastic mold block half and the rear plastic mold block half, while the direction with small projected area should be as lateral parting.
02-Comply with plastic injection mold demolding
Parting surface is for demolding to be successful for plastic components. Therefore, position of parting surface should be chosen on part where the biggest section size of plastic products, which is the basic principle.
03-The shape of parting surface
For conventional plastic sample products, normally a parting surface perpendicular to movement direction of plastic injection molding machine is often used.In particular cases, parting surface of other shapes is adopted.Parting surface shape is based on the principle of being convenient machining and demolding. For example, such as curved plastic products, parting surface will be made according to its curvature.
04- Ensure plastic product appearance and quality
Parting surface is not be chosen on smooth surface of pastic products as plastic product appearance is not allowed to have lines and any other kinds of lines which will impact on its looks, regarding plastic product which has requirement of concentricity,putting features having concentricity in the same side in order to ensure the whole concentricity.
05- Direction confirmation
When plastic product is placed in plastic injection mold,selection of parting surface should prevent formation of side hole or side undercut as well as avoid designing complicated plastic mold structure.
06- Be advantage to demolding
Normally demolding structure is in moving half of plastic injection mold,so parting surface should be leaving plastic product in moving half of plastic injection mold when mold is opening during injection. For areas to be sticky on fixing half of plastic injection mold, assistant structure of fixing half should be considered for demolding.
07- Consider lateral mold opening distance
Lateral mold opening distance is small,core-puling long distance direction should be placed on direction of plastic mold opening and closing, short distance direction to be as lateral parting.
08- Plastic mold components to be easy for machining
Parting surface to be chosen to be considered for easy machining for every components of plastic injection molds in order to simplize machining procedures.
09- Better for venting
Parting surface to be as main venting, we design parting surface to be the end of melt plastic in order to get better venting.
10- R parting
For plastic parts having many parting which also having R of parting surface. R parting must be considered instead of sharp areas.
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