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山東鋁合金壓鑄防止變形與開裂的措施?

刮刮乐2000 www.yfrmbf.com.cn 來源:    發布時間:2019-12-03 11:36:31    點擊:

現在就由濟南市宏捷模具有限公司帶大家了解一下山東鋁合金壓鑄是怎么處理及防止壓鑄模具熱處理變形與開裂的?
  Now Jinan Hongjie mould Co., Ltd. will take you to know how to deal with and prevent the heat treatment deformation and cracking of Shandong Aluminum alloy die casting mould?
  形成壓鑄模具熱處置變形與開裂的緣由是多方面的,包括鋼材的化學成分與原始組織、零件的構造外形和截面尺寸以及熱處置工藝等要素都會觸及。在實踐消費中,變形常常是無法徹底根絕的,只能盡量減小其發作的水平,但只需采取恰當的手腕,開裂的狀況完整是能夠防止的。
  There are many reasons for forming the deformation and cracking of die-casting mould during heat treatment, including the chemical composition and original structure of steel, the structural shape and section size of parts, and heat treatment process. In the practice of consumption, deformation is often not completely rooted, only to minimize the level of its attack, but only to take the appropriate wrist, the complete situation of cracking can be prevented.
  準備熱處置
  Prepare for heat treatment
  所謂的準備熱處置是相關于更終熱處置而言的,就是在更終熱處置之前增加一個起到準備作用的熱處置步驟,這一步驟能夠為更終熱處置提供一個良好的機加性能或組織形態。常見的準備熱處置工藝包括退火、正火和調質等。。
  The so-called preparation heat treatment is related to the final heat treatment, which is to add a preparation step before the final heat treatment, which can provide a good mechanical performance or microstructure for the final heat treatment. Common heat treatment processes include annealing, normalizing and tempering..
  淬火加熱方式和零件的防護
  Quenching heating mode and protection of parts
  淬火和回火是更易使零件產生變形和開裂的過程。關于一些小型壓鑄模具、細長圓柱形零件或高合金鋼模具零件等,應防止運用直接加熱的淬火方式,而是先將其預熱至520到580攝氏度,然后再放入中溫鹽浴爐內加熱至淬火溫度。理論證明,采用這種加熱方式的零件,比直接在電爐或反射爐中加熱淬火,變形量明顯要小,開裂狀況也根本上能夠防止。
  Quenching and tempering are the processes that are most likely to cause deformation and cracking of parts. For some small die-casting dies, slender cylindrical parts or high alloy steel die parts, the quenching method of direct heating should be prevented. 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 theory proves that the deformation of the parts heated by this way is obviously smaller than that of the parts directly heated and quenched in the electric furnace or reverberatory furnace, and the cracking condition can be fundamentally prevented.
山東鋁合金壓鑄
  另外,在停止淬火和回火處置時,有必要對零件容易發作變形和開裂的部位,采取措施停止有效地維護,使其外形與截面對稱,內應力堅持平衡。特別關于那些外形復雜的零件更是如此。常用的維護辦法包括捆包法、填充法和梗塞法等。
  In addition, when quenching and tempering are stopped, it is necessary to take measures to stop the effective maintenance of the parts prone to deformation and cracking, so that the shape and section are symmetrical, and the internal stress is kept in balance. Especially for those parts with complex shape. Common maintenance methods include baling method, filling method and infarct method.
  冷卻方式優化和冷卻劑的選擇
  Optimization of cooling mode and selection of coolant
  當壓鑄模具零件加熱終了,從爐中取出后不應直接放入冷卻劑中,那樣容易形成部分溫差過大而招致變形和開裂。正確的辦法是應先將零件置于空氣之中停止預冷,然后再放入冷卻劑中淬火。為保證零件各個局部冷卻速度平均,放入冷卻劑后還應停止恰當旋轉,且旋轉方向更好是不固定。
  When the die-casting die parts are heated up, they should not be directly put into the coolant after being taken out of the furnace, which is easy to cause deformation and cracking due to excessive temperature difference. The correct way is to put the parts in the air to stop precooling, and then put them into the coolant for quenching. In order to ensure the average cooling speed of each part, the proper rotation should be stopped after the coolant is put in, and the rotation direction should preferably be not fixed.
  冷卻劑的選擇也同樣重要。關于合金鋼而言,運用硝酸鉀和亞硝酸鈉熱浴的等溫淬火或分級淬火是減小變形的有效辦法,特別是對處置外形復雜、尺寸請求準確的壓鑄模具而言。有些多孔模具零件,具有在油中冷卻收縮,在硝酸鹽中冷卻收縮的特征,合理應用兩種不同介質,也能夠減小由于淬火形成的零件變形。
  The choice of coolant is equally important. As for alloy steel, the use of isothermally or step quenching with potassium nitrate and sodium nitrite hot bath is an effective way to reduce the deformation, especially for die-casting dies with complex shape and accurate size requirements. Some porous die parts have the characteristics of cooling shrinkage in oil and cooling shrinkage in nitrate. Reasonable application of two different media can also reduce the deformation of parts due to quenching.
  回火處置的控制
  Control of tempering treatment
  壓鑄模具零件在冷卻劑中淬火之后,不應該在空氣中停留過久,而是要及時放入回火爐中停止回火處置,以消弭零件的內應力,減小變形和開裂傾向。特別關于一些需求停止線切割加工的壓鑄模具零件,在線切割加工之前采用分級淬火和屢次回熾熱處置,能夠有效進步零件的淬透性,使其內應力散布平均,不易發作變形和開裂。在回火處置過程中,一定要防止低溫回火脆性和高溫回火脆性的呈現。
  After quenching in the coolant, die-casting die parts should not stay in the air for too long, but should be put into the tempering furnace in time to stop tempering, so as to eliminate the internal stress of parts and reduce the deformation and cracking tendency. Especially for some die-casting die parts that need to stop the WEDM, the use of graded quenching and repeated heat treatment before the WEDM can effectively improve the hardenability of the parts, so that the internal stress distribution is average, and it is not easy to deform and crack. In the process of tempering treatment, it is necessary to prevent the appearance of low temperature temper brittleness and high temperature temper brittleness.
  以上就是由濟南市宏捷模具有限公司對壓鑄模具熱處理變形與開裂的處理及防止問題的介紹,希望可以幫到你,歡迎訪問官網//www.yfrmbf.com.cn
  The above is the introduction of Jinan Hongjie mould Co., Ltd. to the treatment and prevention of deformation and cracking in heat treatment of die casting mould. I hope to help you. Welcome to the official website //www.yfrmbf.com.cn
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