第542章 这个问题有四种解法4k大章
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应力分布不均匀导致的薄弱点开裂问题,不仅仅国内,在全世界范围内都是个巨大的难题。
一般情况下,如果影响不是特别大,就只能咬咬牙,更频繁地更换零部件。
反正疲劳破坏本来也不是不能用,无非是个寿命问题。
而如果影响很大,那一般就只有针对性补强了。
包括林庆松的本职工作——重型车辆设计,也面临类似的情况。
每一次都得上几年,甚至更长时间慢慢测试和解决。
结果常浩南一上来就是四种解法……
常浩南示意颜永年先回座位,然后自己走到了讲台上面,拿起一根教鞭指着幕布上的设备模型:
“在工作状态中,在锻压机的上部由c型板、十字键、大拉杆、夹紧梁形成一个小的闭环力循。在锻造过程中,液压缸产生的力作用在上板梁上然后传递给c型板,通过十字键依次传给大拉杆、夹紧梁,最后再回到c型板上。”
“所以,这里面最重要的部分是十字键和c型板之间的配合,此二者之间的接触状态,不但会影响力流传递的特征,还会对整机在各个方向的变形产生影响。”
“所以重点在于,在组合结构有较平缓的过渡,使应力和变形顺畅协调传递。”
讲到这里,他回过头,看向下面坐着的十几个人:
“到这一步,认可?”
众人的反应有快有慢,不过基本都点头表示能理解。
“那么,相应地解决方案就是。”
常浩南拉过旁边的黑板,拿起一支粉笔:
“第一,可以在不改变任何构件形状的条件下,设置不均匀的过盈量,这样不会削弱部件本身的强度,至于具体的方法,torchultiphysics中提供了一个叫做‘粘合’的功能,可以把具有不同网格的两部分粘连在一起……”
“这里面,只要过盈量的设定满足Δ=pd103即可,其中e1和e2分别是被包容件与包容件材料的弹性模量……”
“第二,是根据我刚刚进行的力流分析,对十字键和c型板的接触面进行外形修配,减少受压状态下两个零部件的位移量……”
“第三,刚刚说到的开缝问题,实际上是因为预紧力和主作用缸的反作用力产生了一个附加力矩,可以考虑把楔键的下部修配成具有一定斜度的形状,用以平衡这个附加力矩……”
“第四个方法的思路和第三个差不多,不过是通过改变部件结构的方式实现……”
台上,常浩南的思路越讲越通透。
台下,众人也跟着他的思路奋笔疾书。
当然,写着写着,就只能奋笔疾书了。
思路只能回去以后再慢慢回味。
一直到写满两面黑板,常浩南才算是把刚刚临时想到的四种解决办法给讲清楚。
他回过头,本来想问问大家的想法。
但看着或是皱眉思索,或是茫然无措的表情,这个问题终究是没问出来。
有些话,说出来就不礼貌了。
好在能坐在这里的人,也都不会是泛泛之辈。
一时间跟不上思路只是因为他讲的太快太跳跃,而不是真的完全理解不了。
回去多复习一下,总会明白的。
“常总,为什么会这么熟练啊……”
一个稍微年轻一些的技术人员看着面前自己的笔记本,长长地叹了口气。
常浩南自然不可能直接说我开了挂,只好在憋了半天之后回答道:
“或许是因为,torchultiphysics,是我设计的吧……”
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