Analysis of assembly points of injection mold

Analysis of assembly points of injection mold

Before assembly, we should carefully study and analyze the assembly drawings and parts drawings, understand the functions, characteristics and technical requirements of each part, and determine the assembly basis. Through assembly, finally achieve the product quality indicators, mold movement accuracy and use. Various technical requirements.

Assembly basis

(1) The main working parts in the plastic mold, such as core, cavity and inlay, are used as the reference parts for the assembly. The other parts of the mold are assembled and assembled for 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.

Mold assembly accuracy

(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 condition, etc.

(4) The wall thickness of the plastic molded part. When the new mold is made, the wall thickness of the formed part should be biased to the lower limit of the size.

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 gap when the vertical parting surface is touched. The gap value is >0.01mm; the small molds need only be painted with red and then contact each other; the large mold gap is about 0.02mm.

(4) For molds that are clamped with a bevel, after the slope is tightly closed, a gap of 0.02-0.03 mm should be left at the parting surface.

(5) The arc of the repair surface should be smoothed to the straight line, the surface should not be dented, and the ridged line should be consistent with the mold opening direction.