News

Extrusion molding plastic pipe mold, common failures and solutions!

update:30-10-2020
abstract:

⑴Material leakage at the junction of mold and barrel: T […]

⑴Material leakage at the junction of mold and barrel:

The reasons are:

①The machining accuracy of the connection and fit 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.

⑵ Difficulty in disassembly:

The reasons are:

①There is flashing between the combined parts in the mold. ② There is no burr on the mating parts before assembly. ③The connecting solid bolts are not coated with silicone oil before assembly. ④The parts are deformed.

The troubleshooting methods are:

①Re-manufacture to improve the accuracy of matching parts. ② Clean the parts before assembly. ③Apply high temperature resistant silicone oil before bolt assembly. ④ Replace parts, made of high temperature resistant and deformed small steel.

⑶The threaded screw is easy to break:

The reasons are:

① Improper use method. ② The selection of manufacturing materials is unreasonable.

The troubleshooting methods are:

①When adjusting the die gap, loosen the screw on the small side of the gap, 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.

⑷Deformation of parts in the mold:

The reasons are:

① Improper disassembly method. ②Squeezed by heavy objects during storage. ③ Unreasonable selection of manufacturing materials.

The troubleshooting methods are:

①Do 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.