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<正> 塑料的形状主要靠型芯、型胜来保证,能否确保型芯、型腔的相对位置正确,对塑件质量有很大影响。通常型芯、型腔之间都没有直接定位结构,其定位精度主要由导向定位副的定位精度和加工工艺精度来间接保证。能否简化模具结构,使型芯、型腔直接定位来达到导向机构所起的作用呢?笔者在设计尼龙1010油封(见图1)注塑模时,利用型芯凸台和型腔凹穴直接定位,成功地注塑出了合格塑料。现分述如下: 相似文献
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针对塑料模具定模斜向型芯的抽芯设计出一种新型抽芯机构,该抽芯机构由齿条拉杆、螺母及带螺纹型芯组.通过斜齿配合和螺纹配合实现型芯的自动抽芯并锁定,对抽芯机构受力运动分析,确定型芯自锁条件及机构结构参数设计.结果表明,该机构结构较简单,磨损小,对斜向型芯抽芯、定位和锁紧牢靠. 相似文献
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针对定向凝固过程中高压涡轮导向叶片存在沿柱状晶晶界开裂的现象,分析了高温合金柱状晶凝固收缩机理及材料成分对热裂倾向的影响,并对陶瓷型芯高温形变、陶瓷型芯对金属收缩的阻碍等进行了分析。结果发现,定向凝固柱状晶晶界裂纹与晶界结构、合金收缩受阻、陶瓷型芯的形变与漂移有一定的关系。通过采取调整叶型壁厚、陶瓷型芯定位、调整材料成分等措施来抑制定向凝固叶片沿晶界开裂的倾向。 相似文献
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462Q气缸体水套砂芯制芯工艺及热芯盒设计 总被引:8,自引:3,他引:5
选用酚醛树脂砂热芯盒法制作462Q气缸体水套砂芯,以国产ZZ8612射芯机作优先选用机型设计热芯盒,合理选择射砂方向及垂直分盒,确保细窄部位成型及砂芯的整体质量;热芯盒采用一个静模、两个动模,加之动模合理的顶芯机构,从而在ZZ8612射芯机上实现了一盒两芯的设计方案;采用成型冷却模,保证结构强度较低的该水套砂芯在冷却硬化过程中不变型或将变形量减小到最低限度。 相似文献
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介绍了扩散焊接技术在热流道模具分流道板和注射模型芯制造中的应用 ,采用该技术 ,可优化型芯结构 ,缩短成型时间 ,提高塑件质量。 相似文献
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针对有些注射模具的复杂型芯制造工艺性不好、结构难以实现的问题 ,结合工程实际 ,介绍一种将复杂型芯复合化 ,在保证模具型腔结构的前提下 ,改善其制造工艺性的成功实例。 相似文献
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U.C. Nwaogu T. PoulsenR.K. Stage C. BischoffN.S. Tiedje 《Surface & coatings technology》2011,205(16):4035-4044
Foundry refractory coatings protect bonded sand cores and moulds from producing defective castings during the casting process by providing a barrier between the core and the liquid metal. In this study, new sol-gel refractory coating on phenolic urethane cold box (PUCB) core was examined. The coating density, viscosity, moisture content and wet and dry weight of the coating were evaluated on cores that had been coated at three different dip-coating times. The coating coverage, surface appearance and depth of penetration into the cores were examined with a Stereomicroscope. Gray iron castings were produced with sol-gel coated and uncoated cores and the results were related to the coating properties. The casting results were also compared with castings made with cores coated with commercial alcohol-based and water-based foundry coatings. The analyses show that castings produced with sol-gel coated cores have better surface quality than those from uncoated cores and comparable surface quality with the commercial coatings. Therefore, the new sol-gel coating has a potential application in the foundry industry for improving the surface finish of castings thereby reducing the cost of fettling in the foundry industry since the raw materials and technology are easily affordable. 相似文献
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摩托车前挡泥板注射模设计 总被引:2,自引:0,他引:2
通过对摩托车前挡泥板的工艺分析,介绍了挡泥板的模具结构和设计要点,分析了大中型塑料模具整体镶拼式模芯的结构,给出了单个液压缸多方位抽芯的设计方法,解决了注射过程中偏心进料引起的受力不均衡的问题,实现了塑件的顺利顶出。 相似文献