成人精品久久久_极品一线天粉嫩虎白馒头 _日韩a毛片免费全部播放完整_亚洲一区二区三区四区五区

要提升濟南模具加工的精密度，條件有很多，其中最本質的是塑料材料、注塑模具、注塑工藝和注塑設備這四項基本因素。我們設計塑料外殼模具時，應首先選定工程塑料材料，而能進行精密塑料外殼加工的工程塑料又必須選用那些力學性能高、尺寸穩定、抗蠕變性能好、耐環境應力開裂的材料。其次應根據所選擇的塑料材料、成品尺寸精度、件重、質量要求以及預想的模具結構選用適用的注塑機。To improve the precision of the mold processing in Ji'nan, there are many conditions, the most essential is the plastic materials, injection mold, injection molding process and injection molding equipment, these four basic factors. We design the plastic shell mold, should be first selected engineering plastics materials, and can carry out precision plastic shell processing engineering plastics must choose those high mechanical properties, dimensional stability, good creep resistance, environmental stress cracking resistance of materials. Second, according to the selection of plastic materials, product size precision, weight, quality requirements and the expected mold structure to choose the appropriate injection molding machine.

1.關模壓：濟南模具加工原則上應大于塑膠射入模內的總壓，以不出毛邊為基準。Mold closing: Ji'nan mold processing principle should be greater than the plastic injection mold in the total pressure, with no burr as the benchmark. 　　

2.壓力和速度：壓力和速度有部分相同的關系作用于模內。目的使原料進入模內能均勻，徹底，適量的充滿各角落.太低會短射，縮水，太高有毛頭，過飽，粘模，燒焦，易損模具及內應力高等不良現象。Pressure and speed: pressure and velocity have the same effect on the mold. Objective to make the raw material into the mold can be uniform, thorough, full of every corner. The amount is too low will shrink, short shot, too high a feather, satiety, sticking, burning, and internal force of die wearing higher adverse phenomenon.

3.速度：濟南模具加工的速度的快慢決定原料在模具澆道內及成品中之狀況，快有毛邊，過飽，燒焦，慢了出現短射，縮水，結合不良易斷等。　Speed: the speed of mold processing in Ji'nan determines the raw material in the mold and the situation in the finished product, fast edge, too full, burnt, slow the emergence of short shot, shrink, combined with bad easily broken. 　

4.溫度：原料不同，溫度各異，太低溶液膠顏色不均，成品內應力增大.因溫度過低增壓過高，可能引起螺桿斷裂，過高，產品有毛邊，又因冷卻產生溫差，引起收縮。此時，濟南模具加工的原料會分解，變黃，變色，易斷裂.冷卻時間變長，氣不容易排出，會有瓦斯氣。Temperature: different materials, different temperature is too low, uneven color glue solution, the finished internal stress increases. Because the low temperature may cause excessive pressure, screw fracture, high product, a flash, because of cooling temperature difference, cause contraction. At this point, the Ji'nan mold processing materials will decompose, yellowing, discoloration, easy to break. Cooling time becomes longer, gas is not easy to discharge, there will be gas.