设计简介
摘 要
本课题所研究的模具是典型的三板式模具，即双分型面注塑模。双分型面注塑模有两个分型面，Ⅰ－Ⅰ为第一个分型面，分型后浇注系统凝料由此取出；Ⅱ－Ⅱ为第二个分型面，分型后塑件由此脱出。本模具所采用的材料是流动性和成型性优良、成品率高、但易出现裂纹，成型塑件脱模斜度不宜过小的聚苯乙烯。导纸轮制品呈细长圆管形，且其外圆分布有六个直径较大且壁较薄的凸缘，在注射过程中，为便于制品成型，尽量缩短塑料在注射过程中的流程，本模具采用痕迹不影响塑件外观和使用性能的四个点浇口。本模具型芯细长，在注射过程中型芯易变形，为避免在注射过程中细长型芯发生变形，在制品允许存在工艺孔的条件下，设置了八个支撑杆，用以提高型芯的刚性。为保证在开模过程中使制品留在动模一侧，在定模一侧设置了三个顶杆。为便于将浇注系统凝料取出，特设置了两个分型面。
关键词 ： 分型面 动模 定模
ABSTRACT
This topic studies the mold is the typical three board style mold, namely the double-parting line molds. The double-parting line molds has two profiles, I - I for the first parting line, after dividing pours the system to congeal the material from this to take out; II - II for the second parting line, after dividing models from this to leave. This mold uses the material is the fluidity and the form ability fine, the rate of finished products high, but is easy to appear the crack, takes shape models the drawing of patterns ascent not suitable small polystyrene. A guidance turn of product assumes the tall and slender circle tubular-shaped, also its outer distribution has six diameters to be big also the wall thin flange, in the injection process, for is advantageous for the product to take shape, reduces the plastic in injection process flow as far as possible, this mold uses the trace not to affect models an outward appearance and the operational performance four pin-point gate. This mold core tall and slender, is easy in the injection process medium core to distort, for avoids the slender configuration core having the distortion in the injection process, under the goods in process permission existence craft hole condition, has established eight support pillar, with by enhancement core rigidity. In order to guarantee in opens in the mold process to cause the product to remain moves a mold side, was deciding a mold side to establish three ejector pin. In order to be advantageous for pours the system to congeal the material to take out, has established two parting line
KEYWORDS: pin-point gate movable mold stationary mold
1 引言 1
1.1模具工业在国民经济中的地位 1
1.2我国模具工业的现状 2
1.3塑料模具的功能 3
1.4我国塑料模现状及发展趋势 4
2 模塑工艺规程的编制 6
2.1 塑件的工艺性分析 6
2.1.1 塑件的原材料分析 6
2.1.2 塑件的结构和尺度精度分析及表面质量分析 7
2.1.3 塑件的表面质量分析。 7
2.2 计算塑件的体积和质量 8
2.3 塑件注塑工艺参数的确定 9
3 注塑模的结构设计 10
3.1 分型面选择 10
3.2 型腔数目的确定 11
3.3 排气系统的设计 11
3.4 浇注系统的设计 11
3.4.1主流道系统设计 12
3.4.2 分流道设计 13
3.4.3 浇口设计 14
3.4.4 浇口位置的设置 14
3.4.5 冷料穴的设计 15
3.5 脱模机构设计 15
3.5.1 脱模力的计算 15
3.5.2 脱模机构的相关设计 16
3.6 成型零部件的结构设计 16
3.6.1 凹模结构设计 17
3.6.2 凸模结构设计 17
4 模具设计的有关计算及材料的选择 18
4.1 型腔和型芯工作尺寸计算 18
4.1.1 型芯的计算 18
4.1.2 型腔的计算 19
4.2 型腔厚度计算 20
4.3 成型零件材料的选择 21
5 模具加热和冷却系统的计算 23
5.1 求塑料制品在固化时每小时释放的热量Q 23
5.2 求冷却水的体积流量 23
5.3 求冷却水道直径 24
5.4求冷却水在管道内的流速V 24
5.5 求冷却管道孔壁与冷却水之间的传热膜系数h 24
5.6 求冷却管道总传热面积A 24
5.7 求模具上应开设的冷却管道的孔数n 24
5.8 冷却水孔总长度计算 25
6 模具标准件的选用 25
7 模具闭合高度的确定 27
8 注塑机有关参数的校核 27
9结论 28
致谢 29
参考文献 30
本课题所研究的模具是典型的三板式模具，即双分型面注塑模。双分型面注塑模有两个分型面，Ⅰ－Ⅰ为第一个分型面，分型后浇注系统凝料由此取出；Ⅱ－Ⅱ为第二个分型面，分型后塑件由此脱出。本模具所采用的材料是流动性和成型性优良、成品率高、但易出现裂纹，成型塑件脱模斜度不宜过小的聚苯乙烯。导纸轮制品呈细长圆管形，且其外圆分布有六个直径较大且壁较薄的凸缘，在注射过程中，为便于制品成型，尽量缩短塑料在注射过程中的流程，本模具采用痕迹不影响塑件外观和使用性能的四个点浇口。本模具型芯细长，在注射过程中型芯易变形，为避免在注射过程中细长型芯发生变形，在制品允许存在工艺孔的条件下，设置了八个支撑杆，用以提高型芯的刚性。为保证在开模过程中使制品留在动模一侧，在定模一侧设置了三个顶杆。为便于将浇注系统凝料取出，特设置了两个分型面。
关键词 ： 分型面 动模 定模
ABSTRACT
This topic studies the mold is the typical three board style mold, namely the double-parting line molds. The double-parting line molds has two profiles, I - I for the first parting line, after dividing pours the system to congeal the material from this to take out; II - II for the second parting line, after dividing models from this to leave. This mold uses the material is the fluidity and the form ability fine, the rate of finished products high, but is easy to appear the crack, takes shape models the drawing of patterns ascent not suitable small polystyrene. A guidance turn of product assumes the tall and slender circle tubular-shaped, also its outer distribution has six diameters to be big also the wall thin flange, in the injection process, for is advantageous for the product to take shape, reduces the plastic in injection process flow as far as possible, this mold uses the trace not to affect models an outward appearance and the operational performance four pin-point gate. This mold core tall and slender, is easy in the injection process medium core to distort, for avoids the slender configuration core having the distortion in the injection process, under the goods in process permission existence craft hole condition, has established eight support pillar, with by enhancement core rigidity. In order to guarantee in opens in the mold process to cause the product to remain moves a mold side, was deciding a mold side to establish three ejector pin. In order to be advantageous for pours the system to congeal the material to take out, has established two parting line
KEYWORDS: pin-point gate movable mold stationary mold
1 引言 1
1.1模具工业在国民经济中的地位 1
1.2我国模具工业的现状 2
1.3塑料模具的功能 3
1.4我国塑料模现状及发展趋势 4
2 模塑工艺规程的编制 6
2.1 塑件的工艺性分析 6
2.1.1 塑件的原材料分析 6
2.1.2 塑件的结构和尺度精度分析及表面质量分析 7
2.1.3 塑件的表面质量分析。 7
2.2 计算塑件的体积和质量 8
2.3 塑件注塑工艺参数的确定 9
3 注塑模的结构设计 10
3.1 分型面选择 10
3.2 型腔数目的确定 11
3.3 排气系统的设计 11
3.4 浇注系统的设计 11
3.4.1主流道系统设计 12
3.4.2 分流道设计 13
3.4.3 浇口设计 14
3.4.4 浇口位置的设置 14
3.4.5 冷料穴的设计 15
3.5 脱模机构设计 15
3.5.1 脱模力的计算 15
3.5.2 脱模机构的相关设计 16
3.6 成型零部件的结构设计 16
3.6.1 凹模结构设计 17
3.6.2 凸模结构设计 17
4 模具设计的有关计算及材料的选择 18
4.1 型腔和型芯工作尺寸计算 18
4.1.1 型芯的计算 18
4.1.2 型腔的计算 19
4.2 型腔厚度计算 20
4.3 成型零件材料的选择 21
5 模具加热和冷却系统的计算 23
5.1 求塑料制品在固化时每小时释放的热量Q 23
5.2 求冷却水的体积流量 23
5.3 求冷却水道直径 24
5.4求冷却水在管道内的流速V 24
5.5 求冷却管道孔壁与冷却水之间的传热膜系数h 24
5.6 求冷却管道总传热面积A 24
5.7 求模具上应开设的冷却管道的孔数n 24
5.8 冷却水孔总长度计算 25
6 模具标准件的选用 25
7 模具闭合高度的确定 27
8 注塑机有关参数的校核 27
9结论 28
致谢 29
参考文献 30
