• <th id="tiavd"></th>
    <th id="tiavd"></th>
    <tbody id="tiavd"><pre id="tiavd"></pre></tbody>
    1. <rp id="tiavd"></rp>
      1. 歡迎訪問濟南立強模具有限公司!



        來源:http://www.lasagnafarm.com/ 日期:2022-06-30

        Difficult gate stripping
        During injection molding, the gate is stuck in the gate sleeve and is not easy to come out. During mold opening, the product is cracked and damaged. In addition, the operator must knock the tip of the copper bar out of the nozzle to loosen it before demoulding, which seriously affects the production efficiency.
        The main reason for this failure is the poor finish of the gate taper hole and the knife marks on the circumference of the inner hole. Second, the material is too soft, the small end of the taper hole is deformed or damaged after a period of use, and the spherical radian of the nozzle is too small, resulting in the rivet head of the gate material here. It is difficult to process the taper hole of sprue sleeve, so standard parts should be used as much as possible. If you need to process by yourself, you should also make or purchase a special reamer. The taper hole needs to be ground below Ra0.4. In addition, a gate pull rod or gate ejection mechanism must be provided.
        Dynamic and fixed mode offset
        For large molds, due to the different filling rates in all directions and the influence of the weight of the mold itself when installing the mold, the moving mold and the fixed mold will shift.
        In these cases, the guide post will be subjected to lateral offset force during injection, and the surface of the guide post will be rough and damaged during mold opening.
        In order to solve the above problems, a high-strength positioning key is added to each of the four sides of the parting surface of the die. Using cylindrical keys is simple and effective. The perpendicularity between the guide hole and the parting surface is very important.
        In processing, movement is used. After the fixed mold is aligned and clamped, the boring machine is completed at one time, which can ensure the concentricity of the moving and fixed mold holes and small Perpendicularity Error. In addition, the heat treatment hardness of guide post and guide sleeve must meet the design requirements.
        Moving formwork bending
        During mold injection, the molten plastic in the mold cavity produces a huge back pressure, which is generally 600~1000kg/cm2. Mold manufacturers sometimes do not pay attention to this problem, often change the original design size, or use low-strength steel plate to replace the movable formwork. In the mold with ejector pin ejector pin, due to the large span between the seats on both sides, the template is bent downward during injection.
        Therefore, Shandong mold manufacturers believe that the movable formwork must be made of high-quality steel with sufficient thickness. Low strength steel plates such as A3 shall not be used. If necessary, support columns or blocks can be set under the movable formwork to reduce the thickness of the formwork and improve the bearing capacity.
        The above is the relevant content of the question answer. I hope it can help you. If you still have any questions about this problem, you are welcome to follow our website http://www.lasagnafarm.com And consult our staff, will serve you wholeheartedly.

        相關產品 / Related products



        網站地圖    TXT    XML
      2. <th id="tiavd"></th>
        <th id="tiavd"></th>
        <tbody id="tiavd"><pre id="tiavd"></pre></tbody>
        1. <rp id="tiavd"></rp>