There are many types of plastic molds. Even if the same type of molds have different starting and precision requirements due to different types of molded plastics, the assembly methods are not the same. Therefore, the assembly drawings and parts drawings should be carefully studied before assembly to understand the role of each part. Characteristics and technical requirements, determine the assembly benchmark. Through assembly, and finally fully meet the product's various quality indicators, mold movement accuracy and various technical requirements in the use process.
1. Assembly benchmark, assembly benchmark can be roughly divided into
(1) The main working parts in the plastic mold, such as core, cavity and inlay, are used as the reference parts for assembly. The other parts of the mold have assembly reference parts for preparation and assembly.
(2) Trimming and assembling with the guide side guide sleeve or the template side base surface of the mold as the assembly reference surface.
2. Mold assembly accuracy, mold assembly accuracy includes
(1) Each zero, the mutual accuracy of the components, such as distance dimensional accuracy, coaxiality, equality, verticality, etc.
(2) Relative motion accuracy, such as transmission accuracy linear motion and rotary motion accuracy.
(3) Matching accuracy and contact accuracy, such as matching clearance, interference contact status, etc.
(4) The wall thickness of plastic molded parts. When the new mold is made, the wall thickness of the formed part should be biased to the lower limit of the size.
3. Principle of repair
(1) Repair the draft angle. In principle, the cavity should ensure that the large end size is within the tolerance range of the part. The core should ensure that the small carbonyl size is within the dimensional tolerance of the part.
(2) The fillet radius at the corner, the cavity should be small, and the core should be too large.
(3) When the mold has both the horizontal parting surface and the vertical parting surface, the horizontal parting surface should be slightly left with a gap when the vertical parting surface is touched. The gap value is as follows> After the red is in contact with each other, the gap between the large molds is about 0.02mm.
(4) For the mold with the inclined surface clamping, after the inclined surface is tightly closed, the gap of the parting surface should be 0.02-0.03mm.
(5) The arc of the repair surface should be smoothed with the straight line, the surface should not be dented, and the ridged line should be consistent with the mold opening direction.