Production and Handling of Tooling Selections of Types of Molds Molded parts can be produced by more than one type of mold and by various types of mold design. It is important that mold requirements and expected performance be agreed upon prior to acceptance of the order. Unless the customer has requested otherwise, the …
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1.滑块导轨的高至少要为滑块高的1/3，以保証滑块稳定以及滑动顺畅。 2.有滑动摩擦的位置注意开设润滑槽，为了防止润滑油外流，不宜把槽开成“开式”，而应该为“封闭式”，一般可以用单片刀在铣床上直接铣出。 3.固定模仁的型腔，对小模一般用线割，这样可以提高模具的精度；而较大模的模腔一般铣削的形式加工出来，加工时注意其垂直度，并且为了防止装配时，模仁不到位，模框的四周应该用铣刀铣深0.2。 4.入子与模仁，模仁与模仁，模仁与模框的相互穿插一般要加1°的斜度，以防装配时碰伤。 5.入子的靠位部分长度公差为-0.02，大小公差为-0.10，模仁相对应的靠位公差为+0.02。 6.有C 角的入子最底端到C 角部位的公差为+0.01，以防跑毛边。 7. 本体模具的主体部分用NAK80 的材料，入子、梢等用SKH9、SKH51（材料处理：室化处理，也可以不要）的材料，必要时可以使用VIKING 材料。 8.画好部品之后，应先定滑块的位置、大小，防止发生干涉、及强度不够的现象，然后才定模仁寸法。 9.入子大小公差设为-0.01，模仁上入子孔对应的公差为+0.01。 10.模仁上的线割方孔尖角部分用R0.20 过度，对应的入子部分也为R0.20，以对应线切割时的线径影响，同时可以防止尖角部分磨损，而产生益边。 11.与定位珠相对应的小凹坑寸法一般为底径φ3 夹角90°-120°的圆锥孔。 12.固定侧的拔模角应该大于可动侧，以便离型留在可动侧；而且可以防止部品变形，尤其是壁薄，件长容易变形的零件，固定侧对它的拉力不均容易使部品翘曲，或留在固定侧。 13.对于侧面抽芯力大而部品精度要求又严的零件，最好采用二次抽芯结构。 14.斜梢的斜度+2°=压紧块的斜度（一般为18°或20°或22°）. 15.模具组立时，应该养成如下习惯： a.用空气枪清理模仁、模腔、入子、流道板、分模面的表面。 b.装配前用油石打光模仁、模腔、入子、分模面的表面，以便装配时顺tang。 c.注意清角，以防干涉、碰伤。 d.装配前应该考虑后面的工作如何进行。 16.大模具模仁的侧面压紧块应该设计成锁紧后底于分模面0.5-1.0mm,以防干涉。 17. PC+GF20 收缩率3/1000 18.POM 收缩率正常为20/1000，但有时局部会达30/1000。 19.为防止潜伏式浇口在部品顶出时刮伤部品，在流道离潜伏式浇口2-4mm 处增加一锲形块，高约为流道一半，夹角为单边10°，供顶出时折断浇口。 20.主流道拉料井，采用深8-10mm，夹角为单边10°，顶径为流道宽的倒圆锥；这样的好处是可防止单边磨成锲形的拉料在顶出时勾住流道，造成离型不良。 21.开闭器有两种： 1.橡胶制成，靠中心的螺杆调节变形量，来调节拉力。 2.用弹簧钢制成。其作用都为：延迟可动侧与固定侧的开模时间，应用于小水口模。 22.为了确保模具的顶针和斜销是否复位，有些模具安装了早回机构（母的装在108 板上，公的装在102 板上，公的类似于顶针，底部用无头螺钉堵住，一般布置两个）或微动开关（在108 和109 板[装电器元件]之间）。 23.考虑注塑机装夹模具时的螺杆长度，需要注意上下固定板的厚度，必要时四个角应该铣低一些，同时，为了提高安全性，上下固定板上可以根据注塑机上孔的位置，钻四个螺栓孔。 24.斜销的成型端有一段直面，一般长4-6mm，为了在顶出时斜销在107 与108板间滑动顺烫底部应该倒0.5mm-1mm 的R 角。 25.需要咬花的外观品，拔模斜度的设计需要考虑咬花的程度，以免造成外观拉伤。有些突出部位，考虑咬花后截面会变大，实际加工时应该单边小0.02-0.03。 26.考虑固定侧与可动侧合模会形成断差，固定側比可动侧单边小0.03-0.05。 27.有滑块的模具中，有时需要在滑块上的滑块与压紧块相靠的斜面开设油沟；此外，如果不影响成形的前提下，在模板上表面开设油沟比在滑块底部开设油沟加工效率更高。 28.不应该把分型面选在表面有要求的位置。 29.加纤的收缩率为流动方向小千分之1-2，垂直于流动方向大；不加纤的则正好相反。 30.齿顶圆的收缩率比齿根圆的收缩率小千分之1-2。 31.模具在使用一段时间后，需要进行型修，修模仁的过程中，尽量不要用油石，因为多次使用油石会使模具变形；最好用削好的软木或软竹筷。 …
Common problems during the transparent plastic injection molding Due to the high light transmittance demand of transparent plastic parts, the surface quality of plastic products should be very high, and there must be no markings, whitening,fog, black spots, discoloration, poor gloss and other defects. We must pay great attention in the entire injection molding process …
plastic mold venting Before injection molding, there is a large amount of air in the flow path and the cavity. When the melt enters the cavity quickly, it is necessary to discharge the air quickly. In addition, when the melt is solidified in the cavity, there is a vacuum between the product and the cavity wall, …
9 Tips to Make the Mold Buying Process Easier It can be complicated to buy an injection mold, as there will likely be a lot of back and forth between buyer and contract molder before the final product is settled on. However, the following tips can help save you plenty of time, and make the whole …
With the improvement of China’s mold manufacturing and injection molding, more and more European and American companies have come to China to purchase molds and injection molded parts. But for the first time, this process of procurement in China was somewhat difficult for you. The next is the procurement process and manufacturing process for plastic …
With the continuous improvement of the level of mold manufacturing and mold workers’ skill in China, more and more European and American companies have dropped their purchase orders to Chinese plastic mold factories. The continuous deepening of information exchanges between the two sides has greatly promoted the development of China’s mold industry. For those buyers …
short shot short shot in injection molding refers to the phenomenon that the injection material does not completely fill the cavity of the mold, resulting in incomplete parts. It usually occurs in thin-walled areas or areas away from the gate. For some internal face, the short shot does not matter without affecting the beauty; no …