Patent ID: 9162265
Filing Date: 2015-10-20
Classification: B21B,B21D

Abstract:
1. A method for making a collar to the end of a pipe ( 8 ), comprising: positioning a collar making apparatus which comprises an attachment clamp ( 7 ) surrounding the pipe ( 8 ), at a distance from the end of the pipe which corresponds to the width of the collar to be formed, the collar making apparatus comprising a body part ( 1 ), to which is connected by hinging a pivoting cradle in the shape of a fork and equipped with swinging arms ( 4 ) which are pivoted on the body part ( 1 ) in such a way that the pivots ( 5 ) are located at a point outside the pipe, the cradle being provided with a forming cone ( 9 ), which forming cone ( 9 ) can be taken inside the end of the pipe ( 8 ) to which the collar is to be formed; moving the forming cone ( 9 ) by an axial movement, obliquely to the central axis of the pipe ( 8 ), inside the pipe until the forming cone ( 9 ) makes contact with the inner surface of the pipe, making essentially linear contact with the inner surface of the pipe, and the forming cone ( 9 ) is loaded with the desired load pressure against the inner surface; then, pivoting, the forming cone by means of the pivoting cradle outwards from the central axis of the pipe ( 8 ), around the inner edge of the attachment clamp ( 7 ), and at the same time making the forming cone ( 9 ) and pipe ( 8 ) rotate with respect to each other around the central axis of the pipe; and, continuing the pivoting and rotating movements until the desired collar ( 8 ′) has formed against the face ( 7 ′) of the attachment clamp at the end of the pipe, which acts as a back stop for the collar, wherein the body part ( 1 ) is connected to the attachment clamp ( 7 ) in such a way that the axis of rotation of the pivoting cradle determined by the pivots ( 5 ) runs in the direction of the tangent of the pipe ( 8 ), through the center of an imaginary circle determined by the corner radius between the collar ( 8 ′) to be formed and the inner surface of the pipe.