Precision injection mold movements and use of the process of technical guidelines

More types of plastic injection mould, even if the same injection mold due to the different types of plastics molding, beginning with the accuracy requirements are different, assembly methods vary. Therefore, before the assembly should carefully analyze the role of research assembly diagram, parts diagram and the parts of the base assembly to be determined after the final round reached by assembling the quality indicators of the product.

Action precision injection mold process with the use of the technical requirements:

1 Assembly reference, assembly reference can be roughly divided into:

(1) Work with plastic parts such as the main core, cavity and insert quick reference as assembly parts, other parts of the mold assembly has formulated a reference parts and assemblies.

(2) To the template side of the base surface guide pins and bushings or mold assembly datum for trimming and assembly.

2 Die assembly accuracy, precision mold assembly includes:

(1) Each child accuracy of each parts and components, such as the distance between the dimensional accuracy, concentricity, equality, vertical and so on.

(2) The accuracy of the relative motion, such as the transmission precision linear motion and rotary motion accuracy.

(3) Contact with the accuracy and precision, such as with the gap, the amount of interference contact status.

(4) The size of the wall thickness of the plastic molding pieces when freshly mold, forming the lower limit of wall thickness should be somewhat size.

3 Repair principles:

(1) Repair stripping slope, in principle, should ensure that the large end of the size of the cavity in the workpiece size tolerance range should ensure that small core size carbonyl within the workpiece size tolerances.

(2) Radius corners, the cavity should be small, core should be larger

(3) When there should be corrected when both vertical parting surface of the mold parting surface level so that the true vertical parting surface at the level of sub-surface contact with a gap slightly. Gap value depending on the size of the mold, the mold just a small after contact with each other can be painted red, large die gap of about 0.02mm.

(4) For the injection mould, with a slant slant adhesion mold after parting surface should be left at the gap 0.02-0.03mm.

(5) Repair arc and a straight connection to a smooth surface, the surface does not allow any dents, cutting and filing mold lines should be consistent with the direction.