Week 8 - Challenge 5 - Core & Cavity Design

CORE AND CAVITY design for switch bezel:

first of all you have full knowedge about waht is , cavity, parting surface, parting line etc.

core and cavity:

a core is the one part of the mould.and it is respponsible for half of the molded part. actually core is the projection of the bodyand cavity is the depression of the body. these core and cavity combines to form a mould. then the plastic material injected into these mould to get a plastic part.

parting surface:

injection mold has two major components one is core and another is cavity .during the injecction molding process, these two halves are pressed tightly from a sealed hollow to avoid the melt flow leakage and maintain certain holding pressure, the pressed surface are called parting surface , usually parting surface are the biggest projection outline of the part.

parting line:

it is the area in which parting surface and component meets Or it is a junction between core and cavity

and the parting surface has some set of rules because the product quality mostly depends on the parting surface.

DESIGN PARTING SURFACE SHOULD FOLLOW THE FOLLOWING PRINCIPLES :

• Design the injection mold simple as possible .Avoid or reduce side parting as much as possible to reduce complexity of the mold making.
• Ease of de-molding as far as possible, for instance the plastic parts should stay in fixed halve of injection mold and should ejected by ejection system avoid , side de-molding action,
• Ensure the dimension accuracy of the molded parts ,Try to make the parts similar dimension accuarcy reqirements in same mold to reduce manufacturing and assembly errors .
• Ensure apperance reqirement of molded parts,finish or mismatch usually occurs on parting surface , so the parting surface should not be designed on high quality requiremnent surfaces.
• Ensure adequate venting.If possible parting surface should be place at the end of the mold flow.This is going to be advantage of fillng and venting.

core design:

To etrapolate class A surface

trim class A with class c to get inside portion

Now, trim the B surface with with output of Class A & C that will be parting surface with resprect to area.Extrude the skectch overall throgh the tooling direction are trim it with parting surface.

Final output of core design

Part body of core

Similarlly,Repeating the same as done for the cavity part and trim it on other side surface

Part body of cavity

FINAL Close body surfaces of Core & cavity are,

Parting surface and parting line

The core and cavity are translated to the certain value foe understanding

Result:

The core and cavity for the switch bezel has been created as per the design rules.