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What are the common failures of extrusion molding plastic pipe molds

Update:11-08-2021
Summary:

Leakage at the junction of mold and barrel: The reasons […]

Leakage at the junction of mold and barrel:
The reasons are:
①The machining accuracy of the connection and cooperation of the two parts is low. ⒈The mating surface is rough; ⒉The vertical accuracy of the mating surface and the center line of the mold body is low.
②The two contact surfaces of the joint are not clean and there are foreign objects.
The troubleshooting methods are:
①Refit the joint surface of the mold body, ⒈improve the smoothness of the mating surface; ⒉ensure the verticality of the mating surface and the center line of the mold body.
② Overhaul and remove dirt and foreign matter on the two contact surfaces.
Difficulty in disassembly:
The reasons are:
①There is flashing between the combined parts in the mold body.
②There is no burr on the mating parts before assembly.
③The connecting solid bolts are not coated with silicone oil before assembling.
④The parts are deformed.
The troubleshooting methods are:
①Re-manufacture to improve the accuracy of matching parts.
② Clean the parts before assembling.
③Apply high temperature resistant silicone oil before bolt assembly.
④ Replace parts, made of high temperature resistant and deformed small steel.


The threaded screw is easy to break:
The reasons are:
①Improper use method.
② The selection of manufacturing materials is unreasonable.
The troubleshooting methods are:
① When adjusting the die gap, loosen the screw on the small side of the gap first, and then adjust and tighten the screw on the large side of the gap.
②It is made of 45 steel when necessary, and the hardness can reach 40~45HRC after heat treatment.
Deformation of parts in the mold:
The reasons are:
①Improper disassembly method.
②Squeezed by heavy objects during storage.
③The selection of manufacturing materials is unreasonable.
The troubleshooting methods are:
① Do not use heavy hammers for disassembly and installation.
②No heavy objects are allowed on the mold body during storage.
③It is made of high temperature resistant, small deformation steel.