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        當前位置:首頁 ? 行業資訊 ? 焊管成型時的回彈

        焊管成型時的回彈

        發布來源:云南鋼煌商貿有限公司  發布日期: 2022-06-18  訪問量:25

        低碳鋼焊管成型時,反彈一般不是很突出的問題。隨著我國焊管行業的發展,各種新材料在焊管行業的應用,各種低合金、合金鋼焊管等金屬元素的加入,以及合金焊管的開發和生產,成型過程中的反彈已成為一個突出的問題。

        During the forming of low carbon steel welded pipe,the springback is generally not a very prominent problem. With the development of China's welded pipe industry,the application of various new terials in the welded pipe industry,the addition of various metal elements such as low alloy and alloy steel welded pipe,and the development and production of alloy welded pipe,their springback in the forming process has become a more prominent problem.


        成型回彈為:

        Forming springback is inly shown as follows:

        1.根據孔型設計方法設計成型輥,由于回彈,實際較終成型不是所需的形狀,特別是帶鋼邊緣成型不足。

        1.The forming roll is designed according to the pass design method. Due to rebound,the actual final forming is not the required shape,especially the edge forming of strip steel is insufficient.

        2.合金焊管高速生產時,回彈會導致離開擠壓輥時未完全凝固的焊縫出現裂紋,焊管焊縫內表面出現裂紋。

        2.During high-speed production of alloy welded pipe,large rebound will cause cracks at the weld that has not fully solidified when leaving the extrusion roll,and cracks will appear on the inner su ce of the weld of welded pipe.

        3.為了提高合金焊管的焊接速度,管坯的兩個邊緣需要緊密接觸。如果回彈較大,擠壓輥的前后邊緣將打開管坯,使焊接無法進行。

        3.In order to improve the welding speed of alloy welded pipe,the two edges of the pipe blank need to be in close contact. If the rebound is large,the pipe blank will open at the front and rear edges of the extrusion roll, king the welding impossible.

        焊管的成型是一個塑性變形的過程,包括彈性變形的一部分,彈性變形是導致回彈的。金屬不是理想的塑性變形材料。金屬材料在焊管成型過程中的加工硬化和變形條件的復雜性使得回彈問題難以準確解決。

        The forming of welded pipe is a plastic defor tion process,which includes part of elastic defor tion,and it is elastic defor tion that causes springback. Metal is not an ideal plastic defor tion terial. The work hardening phenomenon of metal terials and the complexity of defor tion conditions in the forming process of welded pipe ke it difficult to accurately solve the springback problem.


        就鋼材而言,其彈性模量對化學成分的小變化和微結構的變化不是很敏感,彈性模量差別不大,因此其反彈主要取決于屈服強度,因此冷軋帶鋼作為低碳鋼,強度高于熱軋帶鋼,低合金鋼和合金鋼高于低碳鋼,因此反彈較大。

        As far as iron and steel terials are concerned,their elastic modulus is not very sensitive to s ll changes in chemical composition and microstructure,and there is little difference in their elastic modulus. Therefore,their resilience inly depends on the yield strength. Therefore,as a low-carbon steel,cold-rolled strip has higher strength and greater resilience than hot-rolled strip,and the strength of low-alloy steel and alloy steel is higher than that of low-carbon steel,Therefore,the rebound is large.

        幾種克服反彈的方法:

        Several methods to overcome rebound:

        1.適當增加成型輥的變形量

        1.Properly increase the defor tion of forming roll

        對于一些大型回彈材料或大型焊管設計成型輥,應考慮大回彈因素,適當增加各成型輥的變形,使管坯回彈后的形狀達到所需的形狀,特別是金屬帶的邊緣,有利于防止桃管的產生。

        For some terials with large springback or large welded pipe,when designing the forming roll,the factor of large springback should be considered,and the defor tion of each forming roll should be appropriately increased to ke the shape of the pipe blank after springback reach the required shape,especially the edge part of the metal belt. This method is conducive to preventing the occurrence of peach shaped pipe.

        2.采用加熱成型法

        2.Heating forming method is adopted

        隨著溫度的升高,金屬材料的屈服強度和彈性模量會降低,加熱成型可以減少成型過程中的反彈。

        Because the yield strength and elastic modulus of metal terials will decrease with the increase of temperature,heating forming can reduce the amount of springback in the forming process.


        3.采用非對稱成型法

        3.Adopt asymmetric forming method

        非對稱成型法是指擠壓輥前使用兩組非對稱成型輥,使管坯在進入擠壓輥前發生兩次不對稱變形。只要非對稱輥設計合理,管坯的兩個邊緣就可以在一定距離內保持密切接觸,以滿足焊接要求。

        Asymmetric forming method refers to the use of two groups of asymmetric forming rollers before the extrusion roller,so that the pipe blank has two asymmetric defor tion before entering the extrusion roller. As long as the asymmetric roller is reasonably designed,under the action of the two groups of extrusion rollers,the two edges of the pipe blank can intain close contact within a certain distance,so as to meet the welding requirements.


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