他揉捏她两乳不停呻吟a片,亚洲国产成人精品无码区99,无码jk粉嫩小泬在线观看欧美,黑人上司粗大拔不出来电影

Online Service
Scan it
Support hotline
18681482740
Service Hotline:
18681482740
中文  |   English
News
Contact

Address: Floor 1, Building 2, Quanshengchang Industrial Park, Buyong Shajing Road, Shajing Street, Shenzhen

Contact: Mr. Li 18681482740

Email: lilinhan1314@126.com

Website: www.kotuajans.com

News
How to solve the faults of precision injection molds
04-30 / 2024

The structural feature types and production processing quality of precision injection molds directly affect the quality and work efficiency of plastic handicrafts. There are various phenomena in the process of precision injection mold processing, and the following are solutions to several common phenomena.




It is difficult to remove the material from the gate: during the injection molding operation, the gate adheres to the gate sleeve and is not easy to slip off. During mold opening, handicrafts often show cracks and damage. In addition, the operator must use a copper rod tip to knock it out from the nozzle to loosen it before demolding, which greatly affects work efficiency. The key factor for this type of phenomenon is the poor smoothness of the gate cone hole and the presence of knife marks in the circumferential direction of the inner hole. Another issue is that the material is too soft, causing deformation or damage to the small end of the conical hole after use for a period of time, and the curvature of the nozzle surface is too small, resulting in the formation of rivet heads in the gate material here. The tapered hole of the gate sleeve is difficult to produce and process, so standard parts should be used as much as possible. If self production and processing are required, a dedicated reamer should also be self-made or purchased. The tapered hole needs to be ground to Ra0.4 or less. In addition, it is necessary to set the gate pulling rod or gate ejection mechanism.




Damaged positioning pins: Positioning pins play a crucial guiding role in precision injection molds to ensure that the molding surfaces of the core and cavity do not collide with each other under all conditions, and cannot be used as load-bearing or positioning components. Under the following conditions, the dynamic and fixed molds during injection will generate significant lateral displacement forces: (1) When the wall thickness requirements of plastic parts are uneven, the rate of material flow passing through the thick wall is high, resulting in relatively high pressure; (2) The sides of plastic parts are different, such as the trapezoidal parting surface mold, and the corresponding two sides are subjected to different back pressures.




Moving and fixed mold offset: Large molds have different filling rates in each direction and are affected by the weight of the mold itself during mold installation, resulting in moving and fixed mold offset. In these situations, the lateral displacement force during injection will be applied to the positioning pin, causing the surface layer of the positioning pin to become rough and damaged during mold opening. In severe cases, the positioning pin may deform or break, even making it difficult to open the mold. In order to better improve these phenomena, high-strength positioning keys are added on the parting surface of the mold, one on each side, and the simplest and most reasonable method is to use cylindrical keys. The perpendicularity between the positioning pin hole and the parting surface is very important. During production and processing, the movable and fixed molds are aligned and clamped, and then bored on the boring machine in one go. This ensures the concentricity of the movable and fixed mold holes and minimizes the verticality deviation. In addition, the heat treatment hardness center of the positioning pin and guide sleeve must meet the design requirements.




Dynamic template deformation: During injection of precision injection molds, the molten plastic inside the mold cavity forms a great back pressure, usually between 600~1000 kg/cm2. Mold manufacturers sometimes do not pay attention to this phenomenon and often change the original design dimensions or replace the moving template with low strength steel plates. In molds that use a top bar to top the material, due to the large span of the two seats on both sides, the template bends down during injection. Therefore, the movable formwork must be made of high-quality steel with sufficient wall thickness, and low strength steel plates such as A3 should be avoided. When necessary, support columns or blocks should be set under the movable formwork to reduce the wall thickness of the formwork and enhance its load-bearing capacity.


Links:Zibo CNC machine tool automatic car washing machine Qingdao refrigeration equipment grinder equipment steel grit fire inspection cabinet sweeper motor desulfurization denitrification equipment drawing mold washing machine automatic soldering machine server repair HART475 hand operator dust-free cloth dust-free paper stack screw type Sludge dehydration machine, precision repair welding machine, Shandong motor repair, rotary hot pot equipment, integrated ultrasonic cleaning machine, Zhongjie radial drilling machine, beer equipment, Shenzhen brass manufacturer, welcome lamp, lens digging, drilling rig, aluminum housing manufacturer, automatic dispensing machine, automatic screwing machine neodymium Iron boron magnet 4g router wireless bridge
We provide you with high quality products
爽欲亲伦96部分阅读| 影音先锋资源站| 午夜精品一区二区三区在线观看| 久久精品国产亚洲7777| 日本三级吃奶头添泬播放| 领导每月都要玩我几次怎么办| 女人下边紧了好还是松点好| 成人av视频免费观看| 蜜桃成人无码av在线观看一电影| 吃了他达拉非太硬还需要继续吃吗| 主人在调教室性调教女仆游戏| 门卫老李干了校花琦琦| 成年女性和成年男性bmi| 学生挺进老师的小窄肉里| a级毛片无码免费久久真人软件| 女人扒开腿让男人狂桶30分钟| 最残忍最另类残虐sm的小说| 一区二区三区内射美女毛片| 学长别揉了我快尿了男男| 蜜臀久久精品久久久久酒店| 又硬又粗进去好爽a片潘金莲| 国产无遮挡无码视频免费软件| 国产熟女老妇300部mp4| 翁与小莹最新第九部| 欧美交换国产一区内射| 少妇高潮抽搐无码久久av| 青青草视频在线| 国产精品久久久久久久久免费| 国产成人一区二区三区影院| 欧美毛片又粗又长又大电影| 两个人的免费视频| 午夜dj在线观看| 国产强被迫伦姧在线观看无码| 扒开双腿抽打花蒂惩罚室| 把腿张开我要cao死你| 亚洲无线码一区国产欧美国日产| 国内精品卡一卡二卡三| 猫咪亚洲精品无码mv在线观看| 国产av无码专区亚洲精品| 公开高潮当众露出羞耻h| 欧美又黄又嫩大片a级|