机械5

摘要 随着各种性能优越的工程塑料的不断开发，工业、民业的各种塑料制品需要的不断增长，注塑工艺越来越多地用于制造领域成形各种性能要求的制品。而注塑模具的设计质量、注塑机应用等直接影响成形制品的生产效率、质量及成本。一副好的注射模具可成型上百万次，由于其寿命的延长，从另一方面降低了塑件的成型成本，并且好的模具由于更换，检修少，从而提高了其生产效率。为了满足日益发展的工业的要求和民需生活品的需要，我们应不断的研究开发，设计出能提高注射模性能的注射模，以满足各行各业的需要。 在本设计中，通过运用CAD对电器盖进行一模二穴的设计开发，其中包括凸、凹模的设计、推出机构的设计、注射机的选择与校核、浇注系统的设计、冷却系统的设计、模架的选择等各项工作。在本设计中，设计的重点在成型零部件即凸、凹模的设计和浇注系统、冷却系统的设计。其中浇注系统和冷却系统的设计是一副模具的设计灵魂，浇注系统的设计直接影响着塑件的成型质量和生产效率[1]。因此，对浇注系统的设计是注射模具设计的重点工作。而与此同时，模具的温度对塑件的质量和生产效率也着直接的影响，模具温度的控制直接影响着模具的凝固时间和收缩内应力，从而影响模具的成型周期长短和塑件质量好坏，及其表面粗糙度等。在本设计中着重设计了凸、凹模尺寸、浇注系统和冷却系统的尺寸及其系统结构。通过本次设计，我们首先学习了解了我国塑料模具的现状和发展状况、注射模的基本结构和注射模成型工艺过程以及模具设计的基本原理。 关键词：CAD；CAM；注塑模；工艺 ABSTRACT With the co
nti
nuous developme
nt of each high performa
nce e
ngi
neeri
ng plastics, plastic products i
ndustry, the i
ndustry
needs to co
nti
nue to grow, the i
njectio
n moldi
ng process is more a
nd more used i
n various performa
nce requireme
nts of formi
ng the products ma
nufacturi
ng. The quality of i
njectio
n mold desig
n, i
njectio
n moldi
ng machi
ne by formi
ng a direct impact o
n productio
n efficie
ncy, quality a
nd cost of products. Mold ca
n be a good i
njectio
n moldi
ng millio
ns of times, because of their lo
nger life expecta
ncy, o
n the other ha
nd, reduces the cost of plastic parts moldi
ng, a
nd die as a result of a good replaceme
nt, less mai
nte
na
nce, thereby improvi
ng the productio
n efficie
ncy. I
n order to meet the
needs of the growi
ng i
ndustrial requireme
nts a
nd the quality of life, we should co
nti
nue research a
nd developme
nt, desig
ned to improve the performa
nce of i
njectio
n mold i
njectio
n mold, i
n order to meet the
needs of all walks of life. I
n this desig
n, through the desig
n a
nd developme
nt usi
ng CAD i
n a mold with two cavities o
n the tray, i
ncludi
ng co
nvex a
nd co
ncave mold desig
n, the desig
n of ejecti
ng mecha
nism, the choice of i
njectio
n machi
ne a
nd check, gati
ng system desig
n, cooli
ng system desig
n, the choice of mold a
nd other work. I
n this desig
n, the desig
n focus o
n the desig
n of moldi
ng parts is co
nvex a
nd co
ncave mold desig
n, gati
ng system a
nd cooli
ng system. The desig
n of gati
ng system a
nd cooli
ng system is the soul of a mold desig
n, gati
ng system desig
n directly affects the plastic parts moldi
ng quality a
nd productio
n efficie
ncy of [1]. Therefore, the desig
n of pouri
ng system is the focus of the desig
n of the i
njectio
n mould. At the same time, the temperature of the mould for the plastic parts quality a
nd productio
n efficie
ncy has a direct impact, the mold temperature co
ntrol directly affect the mold solidificatio
n time a
nd co
ntractio
n stress, thus affecti
ng the moldi
ng cycle of mold a
nd plastic parts quality, a
nd surface rough
ness. The size of the co
nvex, co
ncave die size, gati
ng system a
nd cooli
ng system a
nd its system structure desig
n i
n the desig
n. Through this desig
n, we first lear
n to u
ndersta
nd the curre
nt situatio
n a
nd developme
nt of plastic mold i
n our cou
ntry, the basic structure a
nd the i
njectio
n mold i
njectio
n mold a
nd moldi
ng process a
nd the basic pri
nciples of mold desig
n. Keywords: CAD; CAM; i
njectio
n mold; Tech
nology 目录 摘要I ABSTRACT II 目录III 第1章绪论1 1.1蓬勃发展的模具工业1 1.2塑料模具工业的现状和技术的主要发展方向1 第2章塑件的工艺分析3 2.1塑件的工艺性分析4 2.1.1塑件的原材料分析4 2.1.2 ABS的注塑工艺参数5 2.2塑件的结构和尺寸精度及表面质量分析5 2.2.1结构分析5 2.2.2尺寸精度分析5 2.2.3表面质量分析5 2.3计算塑件的体积和质量6 第3章注射机的选择及校核7 3.1注射机的选择7 3.2型腔数目的确定及校核8 3.3锁模力的校核9 3.4开模行程的校核9 第4章浇注系统的设计10 4.1分型面的选择10 4.2主流道的设计11 4.3浇口设计12 4.3.1剪切速率的校核12 4.3.2主流道剪切速率校核13 4.3.3浇口剪切速率的校核13 第5章成型零部件设计14 5.1型腔和型芯工作尺寸计算14 5.2型腔侧壁厚度计算15 第6章合模导向机构设计17 第7章温度调节系统设计18 7.1对温度调节系统的要求18 7.2冷却系统设计18 7.2.1设计原则18 7.2.2冷却时间的确定18 7.2.3塑料熔体释放的热量19 7.2.4高温喷嘴向模具的接触传热19 7.2.5注射模通过自然冷却传导走的热量20 7.2.6冷却系统的计算21 7.2.7凹模冷却系统的计算21 第8章模具工作原理说明23 结论24 参考文献25 致谢26