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轴瓦国家标准(GBI151—82)中第三页倒数第五行规定——“在定位唇周围5mm范围内,其壁厚允许减薄0.015mm”.传统的冲唇法,经冲唇后、其凸唇与圆弧转折临界处不是线而是面,且总有个延伸隆起带(所谓5mm范围)而妨碍着壁厚均匀.隆起带的原因发生在“工位布置与模子”.参见图1、2:由图对比看出,二者之区别在于工位角;图1表示传统冲法,工位角α置于下模α′角互补.由于α′是设计臆定的一个定量,其工作状态使上模冲头刃面与冲床水平台面形成一个工作角β,因二者不是数学关系,为达到工艺要求,势必对β角进行人工修正.不难看出,定位唇工艺依附于工作角修正的手工技艺.在操作上不单增加了难度,而又没有百分之百的把握、图2是改进后的冲唇法,其不同点是工位角α_1(α_1′)是按定位唇尺寸要素(不同机型)通过数学关系而得,所以是个变量,其操作特性在于上
The third and last page of the national standard GBI151-82 (GBI151-82) states that “the wall thickness within the range of 5 mm around the positioning lip is allowed to be reduced by 0.015 mm.” The traditional red lip method, The lip and arc transition critical point is not linear but the surface, and there is always an extension of the uplift zone (the so-called 5mm range) hinder the uniform wall thickness.The reason for the uplift zone occurred in the “station layout and mold.” Referring to Figure 1, 2: It can be seen from the figure that the difference between them lies in the working position. Fig. 1 shows the traditional punching method in which the working angle α is placed at the angle α ’of the lower working mold. Since α’ is a quantitative quantity assumed by the design, State makes the punching punch surface and the punch horizontal table to form an operating angle β, because the two are not mathematical relationship, in order to meet the process requirements, bound to the β angle manual correction.It is easy to see that the positioning lip technology attached to the working angle correction In the operation is not only increased the difficulty, but not 100% sure, Figure 2 is improved after the red lip method, the difference is that the working angle α_1 (α_1 ’) is based on positioning lip size elements (different machines Type) derived from the mathematical relationship, it is a variable, the operating characteristics of the above