您好,欢迎访问济南七和模具有限公司 !

济南七和模具有限公司

主做模具钢材生产研发,保障质量

全国服务热线

4008379668

    当前位置:首页>新闻中心>新闻动态>热作模具钢材需要哪些工作条件?

    热作模具钢材需要哪些工作条件?

    来源:https://www.jnqhmj.com/ 日期:2020-12-16 发布人:admin


    模具钢行业日益兴起,正在走向世界每个角落,江苏模具钢产业也走进了中国前列,很多人对模具钢有一定的了解,但是并不了解热作模具钢的工作条件,那么今天就由江苏苏州东锜模具钢小编为大家讲解一下热作模具钢材需要哪些工作条件。
    Die steel industry is rising day by day, is moving to every corner of the world, Jiangsu die steel industry has also entered the forefront of China, many people have a certain understanding of die steel, but do not understand the working conditions of hot working die steel, so today from Jiangsu Suzhou dongkai die steel editor for you to explain what working conditions hot work die steel needs.
    (l)模腔表层金属受热。通常锤锻模工作时.其模腔表面温度可达300~400℃以上热挤压模可达500一800℃以上;压铸模模腔温度与压铸材料种类及浇注温度有关。如压铸黑色金属时模腔温度可达1000℃以上。这样高的使用温度会使模腔表面硬度和强度显著降低,在使用中易发生打垛。为此.对热模具钢的基本使用性能要求是热塑变抗力高,包括高温硬度和高温强度、高的热塑变抗力,实际上反映了钢的高回火稳定性。由此便可以找到热模具钢合金化的第一种途径,即加入Cr、W、Si.等合金元素可以提高钢的回火稳定性。


    (l) The surface metal of die cavity is heated. In general, the surface temperature of die cavity of hammer forging die can reach 300-400 ℃ and that of hot extrusion die can reach 500-800 ℃. The cavity temperature of die-casting die is related to the type of die-casting material and pouring temperature. For example, the temperature of die cavity can be over 1000 ℃ when casting ferrous metal. Such a high temperature will make the surface hardness and strength of the die cavity significantly reduced, and it is easy to stack in use. Therefore, the basic performance requirement of hot die steel is high thermoplastic deformation resistance, including high temperature hardness and high temperature strength, high thermoplastic deformation resistance, which actually reflects the high tempering stability of steel. Therefore, the first way of alloying hot die steel can be found, that is, adding CR, W, Si and other alloy elements can improve the tempering stability of the steel.
    (2)模腔表层金属产生热疲劳(龟裂)。热模的工作特点是具有间歇性.每次使热态金属成形后都要用水、油、空气等介质冷却模腔的表面。因此.热模的工作状态是反复受热和冷却,从而使模腔表层金属产生反复的热胀冷缩,即反复承受拉压应力作用.其结果引起模腔表面出现龟裂,称为热疲劳现象,由此,对热模具钢提出了第二个基本使用性能要求.即具有高的热疲劳抗力。一般说来,影响钢的热疲劳抗力的因素主要有:①钢的导热性。钢的导热性高,可使模具表层金属受热程度降低,从而减小钢的热疲劳倾向性。一般认为钢的导热性与合碳量有关,含碳量高时导热性低,所以热作模具钢不宜采用高碳钢。在生产中通常采用中碳钢(C0.3%5~0.6%)合碳量过低.会导致钢的硬度和强度下降.也是不利的。②钢的临界点影响。通常钢的临界点(Acl)越高.钢的热疲劳倾向性越低,因此.一般通过加入合金元素Cr、W、Si、引来提高钢的临界点。从而提高钢的热疲劳抗。
    (2) Thermal fatigue (cracking) occurs on the surface metal of die cavity. The working characteristic of hot die is intermittency. The surface of die cavity must be cooled by water, oil, air and other media every time hot metal is formed. Therefore, the working state of the hot die is repeated heating and cooling, so that the surface metal of the die cavity will produce repeated thermal expansion and cold contraction, that is, repeatedly bear the tensile and compressive stress. As a result, cracks appear on the surface of the die cavity, which is called thermal fatigue phenomenon. Therefore, the second basic performance requirement for hot die steel is put forward, that is, high thermal fatigue resistance. Generally speaking, the main factors affecting the thermal fatigue resistance of steel are: 1) thermal conductivity of steel. The high thermal conductivity of steel can reduce the heating degree of the surface metal of the die, thus reducing the thermal fatigue tendency of the steel. It is generally considered that the thermal conductivity of steel is related to the carbon content, and the thermal conductivity is low when the carbon content is high. Therefore, high carbon steel is not suitable for hot working die steel. In production, medium carbon steel (c0.3% 5 ~ 0.6%) is usually used. If the carbon content is too low, the hardness and strength of the steel will decrease, which is also unfavorable. ② Critical point effect of steel. In general, the higher the critical point (ACL) of steel is, the lower the thermal fatigue tendency of steel is. Therefore, the critical point of steel is generally improved by adding alloying elements Cr, W, Si and lead. Therefore, the thermal fatigue resistance of steel is improved.
    以上就是山东模具钢小编为大家带来的热作模具钢材料需要的工作条件,希望能够帮助到大家的学习,喜欢的朋友也可以继续阅读:http://www.jnqhmj.com
    The above is the working conditions for hot working die steel materials brought by shandong Die Steel Co., Ltd. I hope it can help you to learn and your favorite friends can continue to read: http://www.jnqhmj.com

    咨询热线:4008379668

    邮箱:qihemuju@163.com

    地址:山东省济南市鲍山办事处简家屯村内村委会向西50米

    备案:鲁ICP备19056638号-1

    技术支持:网站建设

    流量统计:

    网站地图    TXT    XML

    七和模具二维码

    七和模具二维码