Parts processing inspection is the fundamental guarantee and basis of parts accuracy and mold product quality, mold parts inspection content and inspection means depending on different production conditions and production scale and different.
Because the mold processing belongs to the single-piece production, processing processes, parts surface complex, its quality inspection, and conventional testing are slightly different. At the same time for the mold cavity hardness, corrosion resistance and ornamental processing requirements are difficult to achieve through the general testing methods, only through certain processing methods and process measures to ensure. Sometimes the test results of mold parts can not be evaluated by qualified or not, such as the cavity surface polishing usually indicates the quality of polishing. This is the difference between mold parts testing and ordinary parts testing.
Mold parts inspection content
Mold parts inspection content is mainly geometric inspection, including size tolerance, shape tolerance, position tolerance, surface roughness and threaded core, cavity tolerance, etc.
Dimensional tolerance requirements are to ensure the accuracy of the size of the parts, with dimensional tolerance requirements, are to ensure the interchangeability of the parts, the accuracy of the fit of the motion vice, fit clearance, and deviation. There are two kinds of dimensional tolerances: linear dimensional tolerance and angular taper tolerance. Shape tolerance requirements are to ensure the accuracy and working performance of the mold. Shape tolerance is for a single element, including straightness, flatness, roundness, cylindricity, line contour, and surface contour, etc. Position tolerance is for the associated elements, including parallelism, perpendicularity, inclination, coaxial, position, and symmetry, etc. Surface roughness is an indicator that characterizes the microscopic morphological error of the workpiece surface. Thread inspection includes single-content inspection (such as pitch, tooth angle, mid-diameter, etc.) and comprehensive inspection.
1. Mold plate parts
This type of parts mainly affects the closing accuracy and movement accuracy of the mold and is also an important reference surface in the process of processing and assembly, which needs to focus on the inspection of the surface roughness of the upper and lower plane, parallelism, flatness, perpendicularity with the side, cylindricity of the hole system, perpendicularity, hole size, and hole spacing size.
2. Cavity type parts
These parts are directly related to the dimensional accuracy of the plastic parts, which is the core part of the mold processing but also needs to focus on the content of the inspection. The inspection of cavity parts includes almost all the contents of dimensional tolerance, shape tolerance, position tolerance, surface roughness and tolerance of threaded core and cavity, etc. At the same time, there are also requirements of release slope and surface quality inspection, such as the evaluation of polishing quality and the judgment of whether the plating is off.
3. Structural parts
These parts have the function of guidance and movement, such as guide pillars, guide bushings, sliders, etc., the surface quality requirements are high. Guide pillar inspection indicators are the coaxial, cylindricity, radial dimensions of each step axis section. The guide sleeve is mainly to detect the coaxial, cylindricity, and radial dimensions of its internal and external cylindrical surface. The slider has high accuracy requirements for the parallelism, flatness, and angle of the locking bevel of the sliding fit surface. The tie rod mainly detects the consistency of the axial functional dimensions, and the pressure plate mainly detects the parallelism, perpendicularity, and consistency of the functional dimensions. For push rods, reset rods, and other outsourced parts mainly from the incoming channels to ensure quality, you can test the radial dimension, hardness.
4. Standard parts class parts
The inspection of standard parts class parts needs special equipment, which is difficult to carry out in general enterprises, but the premature fatigue of screws and premature failure of reset springs may cause damage to the mold. So we should use some products from famous enterprises with good quality and high reputation to avoid similar problems.