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造成压铸生产模具损坏的原因有哪些?

来源:http://www.sdlqmj.com 日期:2019-09-05 发布人:admin 浏览次数:
在压铸生产中,模具损坏的常见形式是就是裂纹,开裂。下面济南注塑模具厂家就给大家费分析一下产生这种现象的原因,希望对大家有所帮助!
In die casting production, the common form of die damage is cracking. The following Jinan injection mould manufacturers will give you a fee analysis of the causes of this phenomenon, I hope to help you all!
应力是导致模具损坏的主要原因,热,机械,化学,操作冲击都是产生应力之源,包括有机械应力和热应力,应力产生于:
Stress is the main cause of die damage. Thermal, mechanical, chemical and operational impact are the sources of stress, including mechanical stress and thermal stress. Stress comes from:
1,毛坯锻造质量问题,有些模具只生产了几百件就出现裂纹,而且裂纹发展很快,有可能是锻造时只保证了外型尺寸,而钢材中的树枝状晶体,夹杂碳化物,缩孔,气泡等疏松缺陷沿加工方法被延伸拉长,形成流线,这种流线对以后的淬火变形,开裂,使用过程中的脆裂,失效倾向影响极大。
1. Quality problems of forging blanks. Some dies produce only a few hundred pieces, and cracks develop rapidly. It is possible that the forging process only guarantees the appearance size, while the dendritic crystals, inclusions of carbides, shrinkage holes, bubbles and other loose defects in steel are stretched along the processing method to form a streamline. It has great influence on the subsequent quenching deformation, cracking, brittle cracking and failure tendency in the use process.
2,在车,铣,刨等终加工时产生的切削应力,这种应力可通过中间退火来消除。
2. The cutting stress produced in turning, milling and planer finishing can be eliminated by intermediate annealing.
3,注塑加工淬火钢磨削时产生磨削应力,磨削时产生摩擦热,产生软化层,脱碳层,降低了热疲劳强度,容易导致热裂,早期裂纹,对h13钢在精磨后,可采取加热至510-570℃,以厚度每25mm保温一小时进行消除应力退火。
3. Grinding stress occurs during grinding of quenched steel by injection moulding. Friction heat occurs during grinding, softening layer and decarburization layer occur, which reduces thermal fatigue strength and easily leads to hot cracking and early cracking. After finishing grinding of H13 steel, stress relief annealing can be carried out by heating it to 510-570 (?) C and holding it for one hour with a thickness of 25 mm.
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4,电火花加工产生应力,模具表面产生一层富集电极元素和电介质元素的白亮层,又硬又脆,这一层本身会有裂纹,有应力,电火花加工时应采用高的频率,使白亮层减到小,必须进行抛光方法去除,并进行回火处理,回火在三级回火温度进行。
4. EDM produces stress, and a white layer enriching electrode and dielectric elements is formed on the surface of the die, which is hard and brittle. There will be cracks and stresses in the layer itself. The frequency used in EDM should be used to reduce the white layer to a small extent. Polishing method must be carried out to remove the white layer and tempering treatment must be carried out. Three-stage tempering temperature is carried out.
模具处理过程中热处理不当,会导致模具开裂而过早报废,特别是只采用调质,不进行淬火,再进行表面氮化工艺,在压铸几千模次后会出现表面龟裂和开裂,钢淬火时产生应力,是冷却过程中的热应力与相变时的组织应力叠加的结果,淬火应力是造成变形,开裂的原因,固必须进行回火来消除应力。
The improper heat treatment in the process of die treatment will lead to die cracking and scrap prematurely. Especially, only quenching and tempering without quenching, and then surface nitriding process will lead to surface cracking and cracking after thousands of die casting times. The stress in steel quenching is the superposition of thermal stress in cooling process and structural stress in phase transformation process. As a result, quenching stress is the cause of deformation and cracking, and the stress must be eliminated by tempering.
以上就是今天小编给大家提供的精彩内容了,相关的技术知识由济南注塑模具整理提供,欢迎更多的小伙伴给我们留言评论:http://www.sdlqmj.com
Above is the wonderful content provided by Xiaobian today. The relevant technical knowledge is provided by Jinan Injection Mold Finishing. More small partners are welcome to leave comments for us: http://www.sdlqmj.com.

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