在對模具進(jìn)行注塑加工時，比較容易出現(xiàn)的問題是制品收縮。這是為什么呢？我們要怎么這個問題呢？
In the mold injection processing, the problem is more prone to shrinkage. Why is that? How can we solve this problem?
模具缺陷
Mold defects
對此，澆口和流道截面應(yīng)根據(jù)具體情況適當(dāng)擴大，澆口位置應(yīng)盡量對稱設(shè)置，進(jìn)料口應(yīng)設(shè)置在塑件壁厚部分。如果在離澆口較遠(yuǎn)的地方出現(xiàn)凹痕和縮痕，原因通常是模具結(jié)構(gòu)中某處的熔體流動不暢，阻礙了壓力傳遞。對此，模具澆注系統(tǒng)的結(jié)構(gòu)尺寸應(yīng)適當(dāng)擴大，流道應(yīng)盡量延長出現(xiàn)凹陷的部位。
In this regard, the gate and runner section should be appropriately expanded according to the specific situation, the gate position should be set symmetrically as far as possible, and the feed inlet should be set in the wall thickness part of the plastic parts. If dents and indentations occur further away from the gate, they are usually due to poor melt flow somewhere in the mold structure, impeding pressure transfer. In this regard, the structural size of the casting system should be appropriately expanded, and the runner should be extended to the sunken part as far as possible.
機臺問題
The machine problem
噴嘴孔過大，熔料會倒流收縮，過小，阻力過大，出料量不足。如果合模力不足，毛邊也會收縮，所以
濟南注塑模具認(rèn)為檢查合模系統(tǒng)是否有問題。塑化量不足，應(yīng)選用塑化量大的機器，檢查螺桿、機筒是否磨損。機器設(shè)備的配置和維修檢查也不馬虎，加工中心、精雕等精密模具生產(chǎn)設(shè)備，還有各類注塑機，從設(shè)計開模到注塑，每一個環(huán)節(jié)嚴(yán)格把控，目的是提供更、更完善的服務(wù)。
If the nozzle hole is too large, the molten material will backflow and shrink. If the nozzle hole is too small, the resistance is too large and the discharge quantity is insufficient. If the clamping force is not enough, the burr edge will shrink, so Ji 'nan injection mold thinks that check whether there is a problem with the clamping system. If the plasticizing quantity is insufficient, the machine with large plasticizing quantity should be selected to check whether the screw and barrel are worn. Machine equipment configuration and maintenance inspection is not careless, processing center, precision carving and other precision mold production equipment, as well as all kinds of injection molding machine, from design to mold injection, each link is strictly controlled, the purpose is to provide more professional, more perfect service.
加工方面
processing
料筒溫度過高，體積變化大，特別是前爐溫度。對于流動性較差的塑料，應(yīng)適當(dāng)提高溫度以保證光滑度。注射壓力、速度、背壓太低，注射時間太短，使物料體積或密度不足而收縮壓力、速度、背壓過大，時間過長，造成飛邊和縮水。加料量，即緩沖墊過大時，會消耗注射壓力，過小時，加料量不足。對精度要求不高的零件，注射保壓后，外層基本凝結(jié)硬化，夾層部分仍較軟可頂出，盡快脫模，使它可以在空氣或熱水中緩慢冷卻，可使縮孔平滑，不顯眼，不影響使用。
The barrel temperature is too high, and the volume changes greatly, especially the temperature of the front furnace. For plastic with poor fluidity, temperature should be appropriately raised to ensure smoothness. Injection pressure, speed, back pressure is too low, injection time is too short, so that the material volume or density is insufficient and the shrinkage pressure, speed, back pressure is too large, too long, resulting in flapping and shrinkage. The amount of feeding, that is, when the cushion is too large, it will consume the injection pressure, too small, the amount of feeding is insufficient. For parts with low precision requirements, after injection, the outer layer is basically condensed and hardened, and the sandwich part is still soft and can be pushed out as soon as possible, so that it can be cooled slowly in air or hot water, and the shrinkage cavity can be smooth, unobtruded and does not affect the use.
In addition, raw materials do not meet the requirements of molding, the unreasonable structural design of plastic parts is also the reason for the shrinkage phenomenon of injection mold processing, we must pay more attention to all aspects of the line, more exciting content to http://www.jianninglianzi.com our website to understand it!
