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型腔膜(压铸模、塑料模等)制件的成形,其收缩率一般用下式计算: k_计=(c-b)/b×100％式中 k_计——计算收缩率; b——制件在室温下的单向尺寸; c——模具在室温下的单向尺寸。由于制件成形收缩时受各种因素影形响,所以各种有关手册资料中所列材料的计算收缩率也只是一个范围。为了防止收缩超差,一般须对成形零件尺寸进行验算。按平均收缩率计算模具成形零件尺寸的方法比较简便,所以是最常用的一种方法,其公式一般为: D~(+σ)=(1+1k_平-xΔ)~(+σ) 按平均收缩率计算型芯尺寸的公式一般为: d_(-σ)=(L+LK_平+xΔ)_(-σ)式中σ——模具制造公差(一般为Δ/n,n取值4～6);
Cavity film (die-casting mold, plastic mold, etc.) forming parts, the shrinkage rate is generally calculated using the following formula: k_ meter = (cb) / b × 100% where k_ meter - calculated shrinkage; b- - Unidirectional dimensions of the part at room temperature; c - Unidirectional dimensions of the mold at room temperature. Due to various factors affecting the shrinkage of the part during forming, the calculated shrinkage of the materials listed in the various handbook materials is only a range. In order to prevent over-poor shrinkage, the general shape of the parts to be checked. According to the average shrinkage rate calculation mold forming parts of the size of the method is relatively simple, it is the most commonly used method, the formula is generally: D ~ (+ σ) = (1 + 1k_ flat-xΔ) ~ (+ σ) press The average shrinkage calculation core size formula is generally: d _ (- σ) = (L + LK_ flat + xΔ) _ (- σ) Where σ - mold manufacturing tolerances (usually Δ / n, n value 4 ~ 6);