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防止压铸beplay全站app安卓变形开裂的小窍门!

来源:http://www.jnhjgs.cn     发布时间:2021-06-05 14:22:02    点击:

在压铸beplay全站app安卓零件的生产加工中,由于其形状结构比较复杂,各个部分在截面尺寸上存在着较为明显的差异,因此在进行热处理的时候,各部分加热与冷却的速率也不尽相同。这种情况可能导致在零件的各部分,形成截然不同的热应力、组织应力和相变体积。引起零件体积出现不正常的膨胀或收缩,从而使其尺寸与形状产生较大的偏差,甚至造成开裂。下面beplay全站app安卓加工厂小编给大家讲解一下:
In the production and processing of die-casting die parts, due to its complex shape and structure, there are obvious differences in the section size of each part, so the heating and cooling rates of each part are not the same during the heat treatment. This situation may lead to different thermal stress, microstructure stress and phase transformation volume in each part of the part. It causes the abnormal expansion or contraction of the volume of the parts, resulting in large deviation between the size and shape, and even cracking. The following is a brief introduction from the mold processing factory:
1、造成压铸beplay全站app安卓热处理变形与开裂的原因是多方面的,包括钢材的化学成分与原始组织、零件的结构形状和截面尺寸以及热处理工艺等因素都会涉及。在实际生产中,变形往往是无法彻 底杜绝的,只能尽量减小其发生的程度,但只要采取恰当的手段,开裂的情况完全是可以避免的。
1. There are many reasons for heat treatment deformation and cracking of die casting die, including chemical composition and original structure of steel, structural shape and section size of parts, heat treatment process and other factors. In the actual production, deformation is often unable to completely eliminate, only to minimize the extent of its occurrence, but as long as appropriate measures are taken, the cracking can be completely avoided.
2、预备热处理是相对于热处理而言的,就是在热处理之前增加一个起到预备作用的热处理步骤,这一步骤可以为热处理提供一个良好的机加性能或组织形态。常见的预备热处理工艺包括退火、正火和调质等。
2. Pre heat treatment is relative to heat treatment, that is, adding a heat treatment step to play a preparatory role before heat treatment, which can provide a good machining performance or microstructure for heat treatment. Common preparation heat treatment processes include annealing, normalizing, quenching and tempering.
                               山东beplay全站app安卓
3、淬火和回火是较易使零件产生变形和开裂的过程。对于一些小型压铸beplay全站app安卓、细长圆柱形零件或高合金钢beplay全站app安卓零件等,应避免使用直接加热的淬火方式,而是先将其预热至520到580摄氏度,然后再放入中温盐浴炉内加热至淬火温度。实践证明,采用这种加热方式的零件,比直接在电炉或反射炉中加热淬火,变形量明显要小,开裂情况也基本上可以避免。
3. Quenching and tempering are easy to cause deformation and cracking of parts. For some small die-casting dies, slender cylindrical parts or high alloy steel die parts, the direct heating quenching method should be avoided. Instead, they should be preheated to 520-580 ℃, and then put into the medium temperature salt bath furnace for heating to the quenching temperature. The practice shows that the deformation of the parts with this heating method is obviously smaller than that of the parts quenched directly in the electric furnace or reverberatory furnace, and the cracking can be basically avoided.
4、当压铸beplay全站app安卓零件加热完毕,从炉中取出后不应直接放入冷却剂中,那样容易造成局部温差过大而导致变形和开裂。正确的方法是应先将零件置于空气之中进行预冷,然后再放入冷却剂中淬火。
4. When the die-casting die parts are heated, they should not be directly put into the coolant after they are taken out from the furnace, which will easily cause excessive local temperature difference and lead to deformation and cracking. The correct method is to put the parts into air for precooling, and then put them into the coolant for quenching.
5、压铸beplay全站app安卓零件在冷却剂中淬火之后,不应该在空气中停留过久,而是要及时放入回火炉中进行回火处理,以消除零件的内应力,减小变形和开裂倾向。尤其对于一些需要进行线切割加工的压铸beplay全站app安卓零件,在线切割加工之前采用分级淬火和多次回火热处理,可以有效提高零件的淬透性,使其内应力分布均匀,不易发生变形和开裂。在回火处理过程中,一定要避免低温回火脆性和高温回火脆性的出现。
5. Die casting die parts should not stay in the air too long after quenching in the coolant, but should be put into the tempering furnace for tempering treatment in time, so as to eliminate the internal stress of parts and reduce the tendency of deformation and cracking. Especially for some die-casting die parts that need to be processed by WEDM, the hierarchical quenching and multiple tempering heat treatment before WEDM can effectively improve the hardenability of the parts, make the internal stress distribution uniform, and prevent deformation and cracking. In the process of tempering, it is necessary to avoid the occurrence of low temperature temper brittleness and high temperature temper brittleness.
以上就是beplay全站app安卓加工厂小编给大家讲解的防止压铸beplay全站app安卓变形开裂的小窍门,希望对你有所帮助!
The above is a small die-casting mold processing plant to explain to you to prevent die-casting mold deformation cracking tips, I hope to help you!
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