公开(公告)号：US3750606A

公开(公告)日：1973-08-07

申请号：US3750606D

申请日：1970-03-18

Applicant: ALUMINUM CO OF AMERICA

Inventor： SCHULTZ F

IPC: B21D51/38 ,  F16B5/04 ,  B21D39/00

CPC classification number: B21D51/383 ,  F16B5/045 ,  Y10T29/49938 ,  Y10T29/49943

Abstract: A method of forming an integral rivet in a sheet element including providing cooperating male and female dies and an interposed sheet element, moving the male die toward the female die to draw an outwardly directed hollow boss. Continuing movement of the male die toward the female die to thin an annular region in the lower portion of the hollow boss by compression which establishes metal flow substantially entirely in the direction of the upper portion of the hollow boss. Continuing relative closing movement of the male die with respect to the female die to establish an annular band of thinned material extending upwardly toward the upper portion of the hollow boss, whereby the upper portion of the hollow boss has a thickness substantially equal to the thickness of the remainder of the sheet element. The sheet element may be peripherally restrained around the area in which the boss is formed during boss formation. Apparatus for fabricating an integral rivet in sheet material including a male die having a convexly curved sheet contacting surface and a rearwardly disposed generally cylindrical surface. A female die having a bore defining wall and a peripheral material supporting surface disposed substantially perpendicular to the bore defining wall. An annular concave transition surface connecting the bore defining wall and the material supporting surface. The radius of curvature of the sheet contacting surface and the radius of curvature of the annular concave transition surface being such that movement of the male die toward the female die establishes relative closing movement between the dies which occurs initially at the outer portion of the annular concave surface of the female die and progresses inwardly along the surface as male die movement continues.

Abstract translation: 一种在片材中形成整体式铆钉的方法，包括提供配合的阳模和阴模以及插入的片状元件，使阳模朝向阴模移动以拉伸向外的中空凸台。 使阳模继续移动到阴模，以通过压缩使空心凸台的下部中的环形区域变薄，从而基本上完全沿着空心凸台的上部的方向形成金属流。 阳模相对于阴模继续相对关闭运动以建立向上朝向中空凸台的上部延伸的减薄材料的环形带，由此中空凸台的上部的厚度基本上等于 纸张元素的剩余部分。 片状元件可以围绕在凸起形成期间形成凸台的区域周边地约束。