我厂产品是以管材为主要原料加工的,在管子的弯曲中,我们以前采用的是二滚轮式弯管器,滚轮的沟槽采用半圆形,这样在弯曲半径较小的情况下,常会出现管子内侧受压区起皱纹或被明显压瘪,管子外侧受拉区圆弧面被拉平,如图1所示。通过仔细分析产生缺陷的原因,我们设计了三滚轮式弯管器,如图2所示,滚轮1外径D_1=2(R+r),其中R为管子弯曲半径,r为管子半径。滚轮2、3外径相等,D_2=D_3, I plant products are based on the pipe as the main raw material processing, in the pipe bending, we used to be two roller-type pipe bender, roller groove with a semicircle, so that in the case of smaller bending radius, often The inner pressure zone of the tube wrinkles or was obviously crushed, and the arc surface of the tension zone outside the tube is leveled as shown in FIG. 1. By careful analysis of the causes of defects, we designed a three-roller tube bender, shown in Figure 2, the outer diameter of the wheel 1 D_1 = 2 (R + r), where R is the tube bending radius, r is the tube radius. Roller 2,3 diameter equal, D_2 = D_3,