GB867704A - Improvements in drawbenches - Google Patents

Abstract

867,704. Drawing; bars and tubes. COMPAGNIE FRANCAISE DES METAUX. June 9, 1959 [June 25, 1958], No. 19743/59. Class 83(4). A draw-bench comprises a fixed die carrier 1<SP>1</SP> with at least two dies 21, 22 of decreasing dimensions, a drawing carriage 4<SP>1</SP> with gripping members 10<SP>1</SP> for the work, a device arranged on each side of the bench for receiving the work, supporting-means for the work to be drawn, said supporting means being arranged in tiers and facilitating the engagement of the work in the dies, one such means being adapted to receive a workpiece directly taken from one of the receiving devices and another such means being adapted to receive a workpiece passing out of one of the dies. Tubes of diameter D accommodated in a receiving device or cradle 141 are passed successively first through the die 21 to effect a reduction to diameter D 1 and then through the die 22 for reduction to a diameter D 2 , each tube following the path indicated at f<SP>1</SP> in Fig. 2. After the cradle 141 is empty the dies are changed and the tubes further drawn down in passing back from the cradle 17<SP>1</SP> to the cradle 14<SP>1</SP> on a similar path. Mandrels 8<SP>1</SP> and 9<SP>1</SP> are provided for supporting and engaging the work with the dies each mandrel being capable of pivoting about one end in a horizontal plane through an angle α<SP>1</SP> on either side of the die axis. Two mandrels 8<SP>1</SP> and two mandrels 9<SP>1</SP> are provided so that one each of the mandrels 81, 91 may receive a tube while a preceding tube is still being drawn, mandrel 8<SP>1</SP> receiving a tube D from the cradle 141 while the mandrel 91 receives a tube of diameter D, after its passage through the die 21. Skid arms 16<SP>1</SP> are changed over when the dies are changed. A conventional drawbench for drawing a pair of tubes simultaneously to the same diameter is also described.