In the process of injection moulding into a mould may g […]
In the process of injection moulding into a mould may generate flash (also known as overflow edge, Pi Feng, burrs, etc.), flashes are mostly occurred in the mould's split position, such as moving mould and static mould parting surface, slider sliding Matching parts, gaps in the inserts, holes in the ejector pins, etc., are largely due to the failure of the clamping force of the mould or the machine table. Summarized some specific reasons, as follows:
A. The maximum clamping force of the machine is not enough. The machine with sufficient clamping force should be used. Wear of the mould clamping machine or wear of the mould clamping cylinder wear drops or returns causing a drop in clamping force. If the heating system is out of control and the actual temperature is too high, check if there are any problems with the thermocouple, heating coil, etc.
B. The emergence of "flash" several situations and solutions:
1. The mould cavity disequilibrium or parallelism is not enough to cause local flash and local dissatisfaction due to unbalanced force. Flow paths should be placed in the center of mass symmetry without affecting the integrity of the parts.
2. Friction will be caused when the movable member and sliding core of the mould are unbalanced.
3. When the mould is exhausted poorly, the compressed air will expand the parting surface of the mould and cause flashes. A good exhaust system should be set up, or the exhaust groove should be dug on the parting surface.