Handle mold improvement program

        1 Introduction
        Modern consumer products has gradually entered the personal consumption phase, the product should not only easy to use, appearance, overall visual quality but also in line with consumer and other personal aesthetic taste. There are personality, fashion, high visual impact products to become a hot spot of the market.
        2 Process Analysis
        It looks deceptively simple, but it's because modern aesthetic demands and have an irregular shape; although not too high dimensional accuracy, but to ensure the strength, the appearance of smooth, in line with modern visual taste, do not allow plastic items appear silver, bubbles, strength decreases and other defects.
        In order to ensure the strength of the handle material selected as the PP, wall thickness 2mm, external dimensions of 135mm @ 98mm @ 42mm, take the plastic parts of the shrinkage rate of 1.5%.
        In general, for dial-shaped thin-walled, cassette plastic parts, they use a three-plate injection mold structure.
        For handle of this article, the original use of three-plate injection mold structure, we need flat on the handle mold cavity, so that A to use the built-in fixed mold core pulling out of the first, B to use in the movable mold core pulling cylinders extraction, mold complex structure of the program, processing difficulties and high cost. Based on the above reasons, after a comprehensive analysis, we decided to adopt the part 45b diagonal method, the original three-plate mold plate mold design improvements for two.
        3 die structure
        Since the handle mold structure plastic parts in large quantities, so the use of a two-piece mold to ensure production requirements. The handle mold mainly by moving template, set the template, the fixed mold base plate, the movable mold base plate, big slant, small slant, gate sets, guide pin guide sleeve, push plate, push plate prescribed plate, push plate guide posts bushings and other components, wherein the stationary platen, moving platen are using integrated materials for the P20, at the time of molding, the movable fixed template merge overall preparation, line cutting apart, so save materials and reduce processing costs.
        In the structure of this mold, A direction structure directly from the fixed and moving molding, B direction with a large slant 2 withdrawn at small C take the child out of 12 with a small slant. Gating system in the mold center, with wide 5mm, 1mm deep side of the gate, from the FIG. 1 R side feed.
        4 Incline pulling mechanism design
        Incline pulling mechanism design not only from the top of the action underway core pulling effect, which is mainly used for the inner and outer surfaces of the wall injection molded parts appear irregularities or top L-shaped barbs, etc. appear. Plastic parts ear broken phenomenon. Solve this problem, by combining analysis and motion analysis, using the form shown in oblique push mold structure, that pushed down the ramp guide rails are not parallel to the sliding direction of the main parting line (return lever disposition type face), but and ear inclined surface parallel to the B direction.
        Tilt angle oblique push for bevel angle B to the main parting plus push oblique angle design, in this case: 45b + 15b = 60b. Incline This special joint bodies in the manufacture, oblique elected P20 material, heat treatment HRC30 ~ 34; slider and rail are selected T10A materials, heat treatment HRC50 ~ 55; Also note the following: oblique push and slide it not too big gap between unilateral gap is generally 0.02 ~ 0. 04mm, in order to avoid the top of the ramp and reset push a larger movement. º oblique push and slide with each corner rounded R1 must be designed so, in order to avoid stress concentration leads to cracking; »oblique push four guide rails slippery surfaces and surfaces must be designed with a tank, in order to ensure flexible movement; ¼ We must ensure that the movable platen and push fit oblique angle oblique push their own point of absolute agreement, in order to avoid stuck phenomenon.
        5 Conclusion
        The handle part is inclined mold design cleverly placed in the mold cavity 45b, the B direction oblique ear side rails designed to push the parallel institutions, while at the time of molding the move, scheduled to die cutting merger, then wire-cutting separately, so greatly simplifying the mold structure, reducing the cost of die manufacturing. For the similar appearance of parts, this is an economical and practical handle mold reasonable structure form.