초록 ▼

The disclosed method features an automatic high production process of forming a socket wrench and other elongated hollow parts such as a nutdriver from a tubular metal workpiece. The method of making a nutdriver includes extruding a workpiece through a tapered female die to reduce both the inside an

The disclosed method features an automatic high production process of forming a socket wrench and other elongated hollow parts such as a nutdriver from a tubular metal workpiece. The method of making a nutdriver includes extruding a workpiece through a tapered female die to reduce both the inside and outside diameters at one end of the workpiece and along a predetermined portion of its length from that one end of the workpiece. A recess of non-circular cross section is formed at the other end of the workpiece. In the method of making a socket wrench, an additional step is included in forming another recess of non-circular cross section at the reduced end of the workpiece.

대표청구항 ▼

A method of forming a socket wrench and other elongated hollow parts, such as a nutdriver, from a workpiece of metallic tubing having a generally uniform circular transverse cross section and a generally uniform wall thickness, the method comprising the steps of elongating the workpiece by driving t

A method of forming a socket wrench and other elongated hollow parts, such as a nutdriver, from a workpiece of metallic tubing having a generally uniform circular transverse cross section and a generally uniform wall thickness, the method comprising the steps of elongating the workpiece by driving the workpiece into a die cavity means with a power operated punch to cold extrude a leading axial portion of the workpiece, the elongating step being effected to increase the length of the workpiece by reducing both the inside and outside diameters at one end of the workpiece and along said leading axial portion extending a predetermined length from said one end and forming a longitudinally extending shaft of reduced diametrical dimensions relative to the original diametrical dimensions of the workpiece, maintaining the wall thickness along said longitudinally extending shaft generally equal to the original wall thickness of the workpiece during the elongating step, and broaching a recess of non-circular cross section at the other end of the workpiece opposite its said one end by driving a second power operated punch of non-circular cross section into said other end of the workpiece, maintaining the increased workpiece length and reduced dimension of the cross sectional diameter of said longitudinally extending shaft relative to said other end of the workpiece during the broaching step, and continuously retaining a circular transverse cross section throughout the length of the workpiece during the elongating and broaching steps.