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title="【组图】低压浇铸过程中常见的问é¢?各项操作规程对最后效果的影响">【组图】低压浇铸过程中å¸?..</a><br/> <a href="/news/338.html" title="铸造件的设计要æ±?>铸造件的设计要æ±?..</a><br/> </dd> </dl> </div> </div> <div class="leftitem"> <div class="tit">联系我们</div> <div class="lianxi"> <dl> <dt><div>咨询电话</div> <div class="tel">0315-6192766</div> </dt> <dd> <p>联系:杨国ç¾?/p> <p>手机: 13831547338</p> <p>邮箱: <a href="mailto:tskxjx@126.com" rel="nofollow">tskxjx@126.com</a></p> <p>网址:www.1k2klbg.cn</p> <p>地址: 河北省唐山市玉田县城西环路西侧后湖工业园区路北侧</p> </dd> </dl> </div> </div> </div> <div class="main_right"> <div class="sitemap"><a href="/">首页</a> > <a href="/news/">新闻信息</a> > 详细内容</div> <div class="content"> <div class="news_xaingxi"><h1>压铸失效的原因有哪些ï¼?/h1></div> <div class="news_author"> 来源ï¼?a href='http://www.1k2klbg.cn/news/288.html'>http://www.1k2klbg.cn/news/288.html</a>   å‘布时间ï¼?020-06-01 </div> <div class="news_content"> <p><div style="padding:0px;margin:0px;"> 压铸模具在压铸生产过程中,有时会出现失效,失效的成因主要由以下三方面导致,下面为大家简单介绍: </div> <div style="padding:0px;margin:0px;"> 1.碎裂失效 </div> <div style="padding:0px;margin:0px;"> 在压射力的作用下,压铸模具会在最薄弱处萌生裂纹,尤其是模具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最先出现细微裂纹,当晶界存在脆性相或晶粒粗大时,即容易断裂。而脆性断裂时裂纹的扩展很快,这对模具的碎裂失效是很危险的因素。为此,一方面凡模具面上的划痕、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。另外要求所使用的模具材料的强度高、塑性好、冲击韧性和断裂韧性均好ã€?</div> <div style="padding:0px;margin:0px;"> 2.溶蚀失效 </div> <div style="padding:0px;margin:0px;"> 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,它们与模具材料有较好的亲和力,特别是Al易咬模。当模具硬度较高时,则抗蚀性较好,而成型表面若有软点,则对抗蚀性不利ã€?</div> <div style="padding:0px;margin:0px;"> 3.热疲劳龟裂损坏失æ•?</div> <div style="padding:0px;margin:0px;"> 压铸生产时,压铸模具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。为此,一方面压铸起始时模具必须充分预热。另外,在压铸生产过程中压铸模具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,要确保模具投产前和制造中的内因不发生问题。因实际生产中,多数的模具失效是热疲劳龟裂失效ã€?</div></p> </div> <div class="pagess"> <ul><div>上一æ?<a href="289.html">铝合金压铸件热处理工è‰?/a></div> <div>下一æ?<a href="287.html">【推荐】影响不锈钢铸件尺寸精准的因素是什么_不锈钢铸件加工生成的热解产物是什ä¹?/a></div> </ul> </div> <div 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