RU1814585C - Method of making nuts - Google Patents

Abstract

Usage: metal forming, in particular the manufacture of nuts by cold or hot stamping. SUMMARY OF THE INVENTION: A cut preform with a longitudinal fiber is calibrated. During calibration, at least one of the ends of the preform is inclined with respect to the direction of the fiber. In subsequent settlement, the application of strain forces is carried out at an angle to the location of the fibers of the calibrated preform. 1 s.p. f-ly, 11 ill.

Description

The invention relates to the processing of metals by pressure and can be used in the manufacture of nuts by hot or cold stamping.

The purpose of the invention is to improve the quality of nuts by improving their performance.

Figure 1 shows a workpiece cut off from a bar; figure 2 - detail after the I transition; in Fig. 3 - the same after the II transition; figure 4 is the same after the III transition; figure 5 is the same after the IV transition; on figb - the same, after the V transition; Fig.7 is the same after the VI transition; on Fig - the location of the part and tool before stamping at the I transition; Fig.9 is the same, after stamping on the I transition; in FIG. 10 - the same, before stamping at the II transition; figure 11 is the same after stamping at the II transition.

The method is carried out as follows.

At the first transition, the workpiece is calibrated, cut off from a cylindrical rod with a longitudinal arrangement of fibers, with the end surface

the preforms are produced perpendicular to the axis of the preform, as well as to the metal fibers.

At the second transition, the preform is upset by applying a deformed deformation force to the direction of the fibers of the calibrated transition preform 1. The metal fibers are arranged at an angle to the axis of the workpiece.

At the T junction, the polyhedron and the recesses under the hole are pre-shaped. A deformation force is applied along the axis of the transition workpiece II.

At the IV transition - the final shaping of the polyhedron and the recesses under the hole. A deformation force is applied along the axis of the transition workpiece III. The metal fibers are arranged at an angle to the axis of the workpiece.

At the Vth junction, the hole is pierced with the jumper removed.

At the VI transition - the formation of carvings.

After NI transitions, the workpiece turns over .s 180 °.

Cut off from the bar billet 1 with a longitudinal arrangement of fibers after installation (L

with

™ A

N SL 00 SL

poured into the channel of the transition matrix 2 1. Then, with a punch 3 having a beveled end surface, relying on the ejector 4, the workpiece is calibrated to obtain the end surface of the workpiece 5, which is not perpendicular to its axis, and also to the metal fibers. The stamped preform is pushed out of the matrix 2 by the ejector 4 and, after turning through 180 °, it is inserted into the channel of the transition matrix b, II, after which the punch 7, based on the ejector 8, disembarks the preform 9, applying a deformation force at an angle to the direction of the fibers of the preform 5. After deformation, the metal fibers are arranged at an angle to the axis of the workpiece 9.

Example. The M20 nuts are stamped according to GOST 5915-70 from steel grade 10KP according to GOST 10702-78 on an AB823 machine.

A blank with a diameter of d 23.2 mm and a height of h 23.6 mm is cut from a cylindrical rod. then it is calibrated to a diameter di 24.1 mm and a height hi 23.4 mm, while the angle of inclination of the end surface to the axis of the workpiece is 15 °. At the second transition, the workpiece is upset to a diameter d2 of 28.5 mm and a height of P2 15.6 mm. At the third transition, a preliminary shaping of the hexagon with a diameter of approx.

5

0

5

0

guns d3 31.1 mm and a height of 15.1 mm. At the IV transition, the final shaping of the hexagon is carried out with a diameter of the circumscribed circle d4 of 33.6 mm and a height of P4 of 15.9 mm. At the Vth junction, holes are pierced with a diameter ds of 17.6 mm, after which M20-7H thread is cut.

Claims (2)

1. A method of manufacturing nuts, including cutting a workpiece from a bar with a longitudinal arrangement of fibers, settling the workpiece, preliminary and final formation of a polyhedron, through hole piercing and subsequent thread formation, characterized in that, in order to improve the quality of nuts by improving their operational characteristics, before upsetting, the workpiece is calibrated to obtain at least one of its ends inclined with respect to the longitudinal arrangement of the workpiece fibers, and during upset the next formation of the polyhedron, the deformation force is applied at an angle to the direction of the fibers of the calibrated workpiece. 2. The method according to claim 1, characterized in that when calibrating the workpiece to obtain one inclined end face, it is turned over 180 ° before subsequent upsetting. Phage 7 Fa g / o Phi II