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压铸beplay全站app安卓的失效要注意什么?

来源:http://www.jnhjgs.cn     发布时间:2021-08-18 11:44:41    点击:

一、热疲劳龟裂损坏失效
1、 Thermal fatigue cracking failure
压铸生产时,beplay全站app安卓反复受激冷激热的作用,成型表面与其内部产生变形,相互牵扯而出现反复循环的热应力,导致组织结构二损伤和丧失韧性,引发微裂纹的出现,并继续扩展,一旦裂纹扩大,还有熔融的金属液挤入,加上反复的机械应力都使裂纹加速扩展。
During die casting production, the mold is repeatedly subjected to the action of cooling and heating, the forming surface and its interior are deformed and involved with each other, resulting in repeated cyclic thermal stress, resulting in secondary damage and loss of toughness of the organizational structure, leading to the emergence and continuous expansion of microcracks. Once the crack expands, molten metal is squeezed in, and repeated mechanical stress accelerates the crack propagation.
为此,一方面压铸起始时beplay全站app安卓必须充分预热。另外,在压铸生产过程中beplay全站app安卓必须保持在一定的工作温度范围中,以免出现早期龟裂失效。同时,要确保beplay全站app安卓投产前和制造中的内因不发生问题。因实际生产中,多数的beplay全站app安卓失效是热疲劳龟裂失效。
Therefore, on the one hand, the die must be fully preheated at the beginning of die casting. In addition, in the process of die casting production, the die must be kept in a certain working temperature range to avoid early cracking failure. At the same time, it is necessary to ensure that there are no problems due to internal causes before the mold is put into production and during manufacturing. Because in actual production, most die failure is thermal fatigue cracking failure.
二、碎裂失效
2、 Fragmentation failure
山东铝合金压铸
在压射力的作用下,beplay全站app安卓会在更薄弱处萌生裂纹,尤其是beplay全站app安卓成型面上的划线痕迹或电加工痕迹未被打磨光,或是成型的清角处均会出现细微裂纹,当晶界存在脆性相或晶粒粗大时,即容易断裂。
Under the action of the injection force, the mold will initiate cracks at the weakest part, especially the scribed marks or machining marks on the mold forming surface are not polished, or the fine cracks will appear first at the corner clearing of the molding. When there is brittle phase at the grain boundary or the grain is coarse, it is easy to fracture.
而脆性断裂时裂纹的扩展很快,这对beplay全站app安卓的碎裂失效是很危险的因素。为此,一方面凡beplay全站app安卓面上的划痕、电加工痕迹等必须打磨光,即使它在浇注系统部位,也必须打光。另外要求所使用的beplay全站app安卓材料的强度高、塑性好、冲击韧性和断裂韧性均好。
The crack propagates rapidly during brittle fracture, which is a very dangerous factor for the fragmentation failure of the die. Therefore, on the one hand, all scratches and machining marks on the mold surface must be polished, even if it is in the gating system. In addition, the die materials used are required to have high strength, good plasticity, good impact toughness and fracture toughness.
三、溶蚀失效
3、 Corrosion failure
常用的压铸合金有锌合金、铝合金、镁合金和铜合金,也有纯铝压铸的,Zn、Al、Mg是较活泼的金属元素,它们与beplay全站app安卓材料有较好的亲和力,特别是Al易咬模。当beplay全站app安卓硬度较高时,则抗蚀性较好,而成型表面若有软点,则对抗蚀性不利。
The commonly used die-casting alloys include zinc alloy, aluminum alloy, magnesium alloy and copper alloy, as well as pure aluminum die-casting. Zn, Al and Mg are more active metal elements. They have good affinity with die materials, especially Al is easy to bite the die. When the die hardness is high, the corrosion resistance is good, while if there are soft spots on the forming surface, the corrosion resistance is unfavorable.
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This article is compiled and released by Shandong Aluminum alloy die casting. Do you know something about these contents? For more information, please click: http://www.jnhjgs.cn We will have more wonderful content for you to see.
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