模具工业
模具工業
모구공업
DIE & MOUID INDUSTRY
2014年
11期
45-48
,共4页
PVC挤出制品%离模膨胀比%壁厚中心%口模缝隙%膨胀牵伸综合系数
PVC擠齣製品%離模膨脹比%壁厚中心%口模縫隙%膨脹牽伸綜閤繫數
PVC제출제품%리모팽창비%벽후중심%구모봉극%팽창견신종합계수
extruded product of PVC (polyvinyl chloride)%die swell ratio%wall thickness cen-ter%mouth-die gap%compositive factor of expansion and drawing
分析了聚合物PVC型坯的离模膨胀原因,在挤出模头口模缝隙设计及主体尺寸计算中,引入了离模膨胀比、膨胀牵伸综合系数,论述了基于制品壁厚中心的挤出模头设计方法,比以制品外表面为基准设计口模尺寸的方法误差更小,在此基础上推导出型材主体部分口模缝隙及尺寸的计算公式,并通过计算实例进行了验证。
分析瞭聚閤物PVC型坯的離模膨脹原因,在擠齣模頭口模縫隙設計及主體呎吋計算中,引入瞭離模膨脹比、膨脹牽伸綜閤繫數,論述瞭基于製品壁厚中心的擠齣模頭設計方法,比以製品外錶麵為基準設計口模呎吋的方法誤差更小,在此基礎上推導齣型材主體部分口模縫隙及呎吋的計算公式,併通過計算實例進行瞭驗證。
분석료취합물PVC형배적리모팽창원인,재제출모두구모봉극설계급주체척촌계산중,인입료리모팽창비、팽창견신종합계수,논술료기우제품벽후중심적제출모두설계방법,비이제품외표면위기준설계구모척촌적방법오차경소,재차기출상추도출형재주체부분구모봉극급척촌적계산공식,병통과계산실례진행료험증。
The die swell cause of polymer PVC workblank was analyzed. The die swell ratio, compositive factor of expansion and drawing was indroduced in designing the mouth- die gap and calculating the main size. The design method of extrusion die head based on the product wall thickness center was presented. The calculation method will have a smaller er?ror result compared to that with outline as benchmark to calculate the mouth-die size. On the basis of it, the calculation formula for the mouth-die gap of sectional material main part was derived.