在對冷拔鋼管進行生（shēng）產處理過程中，一般也要進行一定的變形處理，才能在後（hòu）續的應用過程（chéng）中進行更好的使用，那麽在對冷拔鋼管是如何進行變形處理的呢?當凸模下降與冷拔無縫鋼（gāng）管接觸時，冷拔鋼管起首彎曲，在凸模圓角部位材料發生（shēng）脹（zhàng）形變形並發生硬化。凸模繼續下降，此時，冷拔無縫鋼管有兩種變形的可（kě）能，一是凸模（mó）底（dǐ）部坯料在兩向（xiàng）拉應力感化下（xià）發生（shēng）伸長變形，概況積（jī）增添，厚度減薄，即脹形變形;二是法蘭部門坯料在（zài）切向壓應力、徑向（xiàng）拉應力感化下，經由過（guò）程凹模圓角向直壁的流動（dòng），概況積削（xuē）減，厚度（dù）增（zēng）添，即（jí）拉深（shēn）變形。
In the production process of cold-drawn steel pipe, it is generally necessary to do some deformation treatment in order to make better use in the subsequent application process. Then how to do deformation treatment for cold-drawn steel pipe? When the punch drops and contacts with cold-drawn seamless steel pipe, the cold-drawn steel pipe bends at the beginning and at the rounded corner of the punch. Expansion and hardening occur in the site material. There are two kinds of deformation possibilities for cold-drawn seamless steel pipe when the punch continues to drop. One is that the blank at the bottom of the punch will elongate under two-way tension stress, the general product will increase and the thickness will decrease, i.e. the bulging deformation; the other is that the blank at the flange sector will straighten through the round corner of the concave die under tangential compressive stress and radial tension stress. The wall flow, general area reduction, thickness increase, that is, deep drawing deformation.
當冷拔鋼管拉深變形（xíng）阻力與脹形變形阻力相那時，底（dǐ）部的脹（zhàng）形將與法蘭處的拉深同時進行。若拉深變形阻力小於脹形變形阻力，底（dǐ）部和壁部的坯（pī）料將不再（zài）發生變形，法蘭處的（de）坯料向直壁轉移形成筒壁，拉深變形得以順遂進行，直至變形竣事。若拉深變形阻（zǔ）力年夜於底部或縫部脹形（xíng）變形阻力，則將（jiāng）發生脹形變形。
When the deformation resistance of cold-drawn steel pipe is equal to that of bulging deformation, the bulging at the bottom will proceed simultaneously with the drawing at the flange. If the drawing deformation resistance is less than the bulging deformation resistance, the blank at the bottom and the wall will not deform. The blank at the flange will transfer to the straight wall to form the cylinder wall, and the drawing deformation will proceed smoothly until the deformation is completed. If the deformation resistance in deep drawing is greater than that in bottom or joint, the bulging deformation will occur.
因為冷拔鋼管脹形變形水平有限，是（shì）以這種變形體例的（de）改變意味著分裂的起頭。是以，正常的拉深過（guò）程是彎曲、脹形、拉深的變形過程。不然（rán），則為彎曲、脹形、拉深、脹形、分裂的過程。彎曲變（biàn）形在拉深過程中始終存在。脹形變形或是存在（zài）於變形初（chū）期（qī），或是存在於加工的全過程，或是（shì）與拉深變形瓜代進行直至變形竣事或零件開裂。
Because the expansion deformation level of cold-drawn steel tube is limited, the change of deformation means the beginning of splitting. Therefore, the normal drawing process is the deformation process of bending, bulging and deep drawing. Otherwise, it is a process of bending, bulging, drawing, bulging and splitting. Bending deformation always exists in the process of deep drawing. Bulging deformation exists either in the initial stage of deformation, or in the whole process of processing, or in the process of substitution with deep drawing deformation melon until the end of deformation or cracking of parts.
在對冷拔鋼管（guǎn）進行加工處理的過程中也是比較容易出現一些（xiē）弊（bì）端的，所以（yǐ）這就要求我們在冷拔鋼管進行生產的過程（chéng）中需要注意了，盡量較少一些缺陷的發生。
In the process of processing cold-drawn steel pipe, there are also some drawbacks, so it requires us to pay attention to the production process of cold-drawn steel pipe and try to reduce the occurrence of some defects.
