注塑模具成形零件的設計一般要先設計模具型腔的數量和排位。模具的型腔不能簡單的套用機械零件的尺寸公差，塑件的尺寸精度寸會受到塑件結構，塑件原料和生產時塑件收縮率等很多因素的影響，所以，模具型腔的排位要遵循一定的原則，才能符合模具制造的要求。
In the design of injection mold parts, the number and arrangement of mold cavities should be designed first. The dimensional tolerance of mechanical parts cannot be simply applied to the mold cavity. The dimensional accuracy of plastic parts will be affected by many factors such as plastic part structure, plastic part raw materials and plastic part shrinkage during production. Therefore, the ranking of mold cavity must follow certain principles in order to meet the requirements of mold manufacturing.
模具型腔的排位原則要求如下：
The principle requirements of mold cavity arrangement are as follows:
1.流道短原則:防止澆注系統凝料,還可節約鋼材及模具制造成本，提高注塑過程產品的合格率。
1. Principle of short flow channel: prevent solidification of gating system, save steel and mold manufacturing cost, and improve the qualification rate of products in injection molding process.
3.壓力平衡原則:使模具在注射時承受漲型力的合力靠近模具中心,與注塑機的鎖模力在同一條直線上，避免不平衡的流動導致分子取向不規則，引起收縮率不一致。
3. Pressure balance principle: make the resultant force of the mold bearing the expansion force close to the center of the mold during injection and in the same line with the clamping force of the injection molding machine, so as to avoid irregular molecular orientation caused by unbalanced flow and inconsistent shrinkage rate.
2.溫度平衡原則:使模具型腔各處的溫度大致相等,保證各型腔塑件的收縮率相等。
2. Principle of temperature balance: make the temperatures at all parts of the mold cavity approximately equal to ensure that the shrinkage of plastic parts in each cavity is equal.
4.進料平衡原則:對于一模多腔的模具,同一塑件應從同一位置進料,以保證塑件的互換性;流道和澆口的大小、長短應與塑件大小相適應,盡量保證各型腔同時進料,同時充滿保證每個型腔進料均勻。
4. feeding balance the first mock exam for multi cavity mold, the same plastic parts should be fed from the same position to ensure the interchangeability of the plastic parts. The size and length of the runner and gate shall be consistent with the size of the plastic part, and try to ensure that each cavity is fed at the same time and filled at the same time, so as to ensure that each cavity is fed evenly.
合理設計制造注塑模具成型零件的型腔，保證塑件的成型質量，提高模具的生產效率。
Reasonably design and manufacture the cavity of injection mold molding parts, ensure the molding quality of plastic parts and improve the production efficiency of the mold.
