Back to Results   |You are in :  Home  >  Tube Formation

The processes which predominate in this respect are cold drawing and cold pilgering. Cold forging, flow forming, cold rolling and other processes involving machining operations (e.g. honing) are less important in terms of the quantities produced and tend to be reserved for the manufacture of tube and pipe for special applications

Cold Forming-In plug drawing, a plug which is either fixed to a mandrel bar, or a so-called floating plug (this lodges in the forming zone as a result of its particular shape and the forming pass it produces) forms an annular gap with the block die through which the tube is drawn. This reduces within close tolerances both the outside and inside diameters, and thus also the wall thickness, as well as smoothing and polishing both the outside and inside surfaces

Cold Pilgering -The cold pilgering process is characterized by the fact that the hollow blank is forged and elongated over a stationary, tapered mandrel by two rolls with ring dies of a corresponding pass design which reciprocate back and forth over the stock.This rolling action is imparted by a rack and pinion arrangement in which the pinions are rigidly connected to the pilger rolls, so causing them to rotate as the rolling stand traverses to and fro.


The rolling stand motion, and thus the longitudinal travel and rotation of the rolls, is powered by a crank drive.The pass design of the two rolls consists of a circular recess, corresponding to the cross section of the hollow blank, which tapers over a certain portion of the roll circumference to provide an ideal, continuous transition to the finished tube diameter. Consequently, as the rolls move forward and backward, the hollow blank is formed in the desired manner


We use cookies to offer a better browsing experience, analyze site traffic, and personalize content. By using this site, you agree to our use of cookies.

Accept
Decline