一般模具加工在選擇分型面的選擇會影響到開模后的注塑件是滯留在動模型腔中，還是滯留在定模型腔中，進而影響到產品能否順利脫模，還會影響到模具型腔的加工性。分型面處是否會產生飛邊或分型面的痕跡線是否會影響到注塑件尺寸形狀壁厚模具結構模具排氣及注塑件膜模。故選擇分型面時，要綜合考慮各方面影響因素條件和要求，合理地選擇分型面。
In general, the choice of parting surface in mold processing will affect whether the injection molded parts stay in the moving mold cavity or in the fixed mold cavity, which will not only affect the smooth demoulding of products, but also affect the processability of mold cavity. Whether there will be flash at the parting surface or whether the trace line of the parting surface will affect the size, shape, wall thickness, mold structure, mold exhaust and film mold of injection parts. Therefore, when selecting the parting surface, we should comprehensively consider all influencing factors, conditions and requirements, and reasonably select the parting surface.
模具加工在選擇分型面應考慮的因素：
Factors to be considered in selecting parting surface for die processing:
一般情況下，注塑件應滯留在動模型腔中，越便于產品的脫模；
Generally, the injection molded parts should stay in the moving mold cavity, which is more convenient for product demoulding;
應避開障礙體的阻礙，避免運動干涉，方便產品脫模和模具型腔的加工；
The obstacles shall be avoided to avoid movement interference and facilitate product demoulding and mold cavity processing;
應盡量設在不顯眼和易去除飛邊毛刺及容易加工的位置上；
It shall be set in an inconspicuous position where it is easy to remove flash and burr and easy to process;
應設在無凹陷及圓弧R的切點之外的位置上；
It shall be set outside the tangent point of arc r without depression;
應考慮到澆口位置的設置及其形狀；
The setting of gate position and its shape shall be considered;
有利于澆注系統和排氣系統的布置；
It is conducive to the layout of gating system and exhaust system;
不影響模具加工的尺寸及其精度；
It does not affect the size and accuracy of die processing;
應考慮塑料的性能及填充條件；
The properties and filling conditions of plastics shall be considered;
應考慮成型的工藝性及效率；
The processability and efficiency of forming shall be considered;
模具的結構簡單使用方便穩定。
The die has simple structure, convenient and stable use.
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