注塑模具毕业设计说明书(5)

天津职业技术师范大学2011届本科生毕业设计

第五章 注塑机校核

5.1注射量的校核

注射生产中,注射机每一个成形周期向模内注入的熔体体积或质量称为制品的注射量。其中包括模内浇注系统和飞边所用的的熔体量。选择注射机时，必须保证制品的注射量小于注射机允许的最大注射量。根据生产经验，制品注射量一般不超过注射机最大注射量的80%。XS-Z-30注射机标定的是额定注射量，即最大注射量，因此按注射量校核。

图13

kVmax≥V=ΣVi+V浇

式中 Vmax为注射机的最大注射量，单位为cm；

V为制品总体积（包括制品、浇注系统及飞边在内），单位为cm； Vi为一个制品体积，单位为cm，图13所示塑料零件尺寸 ； n为型腔数， k～～注射机最大注射量利用系数，取k=0.8； V浇～～浇注系统及飞边体积，单位为cm。 V=nVi+ V浇 因为初步设计为两腔，所以n=2。 Vi=17（cm） V浇=6.7（cm）

kVmax=0.8×250=200 ≥40.7（cm） 因此，此注射机注射量足够。

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3333333天津职业技术师范大学2011届本科生毕业设计

5.2注射压力校核

ABS成形所需的压力为70～90MPa，而XS-Z-30注射机的最大注射压力为119MPa，在ABS成形所需压力的范围之内，因此，该注射机注射压力足够。

5.3模具高度与注射机闭合高度的关系校核

模具的闭合高度应在注射机最大与最小闭合高度之间，即模具的厚度应在注射机允许的模具最大厚度和最小厚度之间。此模具的厚度为285mm，XS-Z-30注射机允许的模具最大厚度为350mm，最小厚度为200mm，200<285<350，因此合格。

5.4开模行程的校核

注射机的开模行程应大于脱模取出塑件所需的开模距离。XS-Z-30注射机为液压—机械式合模机构的注射机，其最大开模行程系由肘杆机构或合模液压缸冲程所决定，而不受模具厚度影响，按注射机最大开模行程大于模具所需的开模距离进行校核。此次设计的模具为三分型面模具，因此对于三分型面开模行程的校核公式为。

Smax?H1?H2?a?(5~10)

Smax?H1?H2?a?(5~10)因此对于单分型面开模行程的校核公式为.

式中H1为制品所用的脱模距离，H2为制品高度，注系统凝料必需的长度，单位均为mm。然而这种校核方法是针对不带侧向抽芯机构的模具。带有侧向抽芯机构的模具，其开模行程的校核必须考虑侧向抽芯距离。

此次设计的模具，其侧向抽芯动作是通过斜导柱带动滑块实现的，这时，需根据侧向抽芯的抽拔距离来决定开模行程Smax。

Smax=SK-HM

式中SK为注射机动模固定板和定模固定板的最大间距（mm）； HM为模具厚度（mm）

H1+H2+（5～10）+a=387～392＜Smax

XS-Z-30注射机的最大开模行程为500mm，因此开模行程足够。

对注射机的校核还有安装部分的尺寸校核，因为在模具结构设计时，就根据注射机的模具安装要求设计的，所以此校核可以省略。

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天津职业技术师范大学2011届本科生毕业设计

总 结 参考文献

[1] 唐志玉,李德群等.塑料模具设计师指南.北京:国防工业出版社,1993. [2] 屈华昌.塑料成型工艺与模具设计.北京:高等教育出版社,2005.

[3] 李德群,唐志玉等.中国模具设计大典 第2卷.南昌:江西科学技术出版社,2003. [4] 屈华昌.塑料模具设计.北京:机械工业出版社,1992.

[5] 王孝培.塑料成型工艺及模具简明手册. 北京:机械工业出版社,2001. [6] 于 华.注射模具设计技术及实例.北京:机械工业出版社,1998. [7] 许发樾.实用模具设计与制造手册.北京:机械工业出版社,2000. [8] 许发樾.模具标准应用手册.北京:机械工业出版社,1997. [9] 袁国定.模具常用机构设计.北京:机械工业出版社,2003.

[10] 章 飞,陈国平等.型腔模具设计与制造.北京:化学工业出版社,2003. [11] 夏巨谌.塑性成型工艺及设备.北京:机械工业出版社,2001.

[12] 常芳娥,坚增运等.注压成型模具设计.西安:西北工业大学出版社,2006. [13] 张荣清.模具设计与制造.北京:高等教育出版社,2003. [14] 张克惠.注塑模具设计.西安:西北工业大学出版社,1995.

[15] 许鹤峰,陈言秋等.注塑模具设计要点与图例.北京:化学工业出版社,1999. [16] 高军,李熹平.注塑工艺成型分析急模具设计指导.北京：化学工业出版社，2009. [17]陈孝康，陈炎嗣等.实用模具技术手册.北京:中国轻工业出版社,2001年. [18]田光辉,林红旗.模具设计与制造.北京:北京大学出版社,2009年.

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天津职业技术师范大学2011届本科生毕业设计

英文翻译 Molding structure

Because the plastics industry flies soon development and plastics product the expansion in each realm apply, the request of product to molding tool is also more and more high. Experience that also designs a personnel to the profession in the meantime make higher request, it was the important factor that decides product function to establish the choice of time-accounting system article material in the plastics product molding tool. Still have product wall thick etc. problem is an assistance to design software to can not solve of, need the profession designs a personnel for a long time the empirical backlog then can work well. Therefore this text plastics product the molding tool designs to win some discussions that the important problems do with the synopsis.

In the country plastics industry development, the application of calculator contained important function. The calculator technique designs the application of realm in the molding tool and consumedly shorten a molding tool design time, particularly the calculator lends support to the large-scale expansion of engineering(ＣＡＥ ) technique and solved the plastics product development, molding tool design and product to process medium weak link. The embodiment appears the superiority of generation science and technology more in the aspects of raising rate of production, promising product quality and declicod low cost etc.. But the modern technique can not act for experience of profession design personnel, when plastics molding tool's establishing the choice of time-accounting system article material is to decide that the molding tool designs the important factor of molding tool material choice. How choose suitable material, is an important problem , in the molding tool that design.

The choice of the plastics product material to the influence that the molding tool designs

There is not good material generally speaking, only used false material in the particular realm. There fore, the design has to thoroughly understand various function of material that can be provided as choice, and cautiously test these materials, study it and various factor is to the influence that models to process product function. This text carries on analysis for the hot Su material of tradition to explain a problem. In the middle of injecting and modeling most in common use of is hot Su plastics. It can is divided into to have no already set plastics and half plastics again. These two types of materials are in the member structure and is turned by crystallize there is obvious dissimilarity on the function of influence. Generally speaking, half hot Su the plastics mainly used for the parts of machine high strength, but has no already set hot Su plastics because of not easy, then often drive applied at the outer shell. This is the big frame of material choice want to continue to choose according to the filler and to build up material secondly.

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天津职业技术师范大学2011届本科生毕业设计

The analysis that carries on a choice according to the filler and the to build up material

The hot Su plastics canned is divided into don't strengthen, the glass fiber to build up, mineral and vitreous body fill etc. category product. The glass fiber is mainly used for increasing strength, hard degree and exaltation to apply temperature; Mineral and Bo Xian then have lower to build up effect and mainly used for decrease to raise a song. The glass fiber will influence to model to process, particularly will produce constringency and raise a song to the parts. So, the glass fiber strengthens material ability not drive have never strengthened hot Su plastics or low content to build up material to act for, but can't have a size change. The mindset of glass fiber is decided by the fluxion direction, this will cause the variety of parts machine strength. Experiment(from inject to model a slice of horizontal and lengthways intercepted 10 tests, and at the same pull a dint test instrument top to they of the machine function carried on a comparison) enunciation, to added the hot Su polyester resin that 30% glass fibers strengthen, it horizontally pulled to stretch a strength ratio lengthways(fluxion direction) low the 32%, the song amount of mold and impact strength reduced 43% and 53% respectively.

In the comprehensive calculation for considering the strength of safe factor, should notice to these loss.

At some hot Su joined a series of to build up material, filler and change sex to change their properties in the plastics. BE had to in earnest check from the manual or the database by the function variety of these additive creations, better still expert's technique suggestion of house for hearing original material manufactory. With choice most is suitable material.

Consider degree of humidity that the influence is to the material function Some hot Su material, especially PA6 and PA66, the hygroscopic power is very shot. This probably is to their machine functions and the bigger influence of the size stability creation. While carrying on a design, should specially notice this kind of function, consider its influence to the product function.

The choice of the molding tool material is decided by product material, meticulous analysis product material after they can choose the most suitable molding tool material when the molding-tool-design.

The plastics product molding tool material chooses

After the material of meticulous analysis plastics product usage, select by examinations the most suitable molding tool material. Currently our country the market is familiar, the suitable heat shrink the molding tool material of sex material to have: The non- metal alloy models to anticipate a molding tool steel(namely the carbon plain steel), ooze carbon to model to anticipate a molding tool steel and prepare hard model to anticipate molding tool steel, time limited efficacy hard to model to anticipate molding tool steel and whole Cui hard model to anticipate a molding tool steel and bear corrosion to model to anticipate the molding tool steel a few kinds. When the molding tool material selects by examinations, according to whether product material changes sex and

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