浇口剥离困难
Difficult gate stripping
注塑过程中，浇口粘在浇口套内，不易脱出。开模时，产品有裂纹损坏。此外，操作人员在脱模前必须将铜棒的从喷嘴中敲出以使其松动，这严重影响了生产效率。
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.
造成这种故障的主要原因是浇口锥孔光洁度差，内孔圆周方向有刀痕。二是材料太软，使用一段时间后锥孔小端变形或损坏，水口球面弧度太小，导致浇口材料在这里产生铆头。浇口套锥孔加工难度大，应尽量采用标准件。如果需要自己加工，还应制作或购买专用铰刀。锥孔需要磨削到Ra0.4以下。此外，还必须提供浇口拉杆或浇口弹出机构。
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.
动、定模偏移
Dynamic and fixed mode offset
对于大型模具，由于各个方向的填充率不同，以及安装模具时模具自身重量的影响，会出现动模和定模偏移。
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.
在这些情况下，注射时导柱会受到横向偏移力，开模时导柱表面会粗糙和损坏。
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.
为了上述问题，在模具分型面的四个侧面各增加一个高强度定位键。使用圆柱键既简单又有效。导孔与分型面的垂直度非常重要。
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.
在处理中，使用了移动。定模对位并装夹后，镗床一次完成，可保证动、定模孔的同心度，垂直度误差小。此外，导柱和导套的热处理硬度必须符合设计要求。
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.
移动模板弯曲
Moving formwork bending
模具注射时，模腔内的熔融塑料产生巨大的背压，一般为600~1000kg/cm2。模具制造商有时不注意这个问题，经常改变原来的设计尺寸，或者用低强度的钢板代替动模板。在带顶杆顶杆的模具中，由于两侧座之间的跨度大，注射时模板向下弯曲。
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.
因此，
山东模具制造厂家认为动模板必须采用钢材，并有足够的厚度。不得使用A3等低强度钢板。必要时可在动模板下设置支撑柱或支撑块，以减少模板厚度，提高承载能力。
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.
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