SU846020A1 - Thread rolling-on head - Google Patents

Description

(54) CARVING HEAD

one

The invention relates to the processing of metals by pressure, in particular, to devices for the manufacture of internal threads by plastic deformation.

Known thread rolling tool, containing placed in the housing of the knurling rollers with a circular thread and a support roller with a threaded thread 1.

The disadvantage of this tool is that when the rolling rollers roll over the support roller, slippage is possible, therefore, after machining several threaded holes, the support roller changes its initial position and it can exit from the threaded zone.

The closest to the proposed is a thread rolling tool containing knurled rollers with ring cutting, a threaded support roller with a shank and a mechanism for returning the support roller to its original position, made in the form of a flat spiral spring, and the spring is installed at one end with a slot of the shank along the groove, and the other end is fixed on the tool body 2.

However, this tool is not suitable for processing long threads due to the limited length of the flat coil spring. Increasing the length of the spring leads to an increase in the dimensions of the tool and a decrease in spring stiffness. Thus, for example, for processing threads with a length of 10 threads, it is necessary to have a spring providing more than 30 turns, which, with a shank diameter of 10 m, constitutes a spring length greater than 1 m, while its rigidity in the free state is insignificant.

The purpose of the invention is to expand the technological capabilities of the tool.

Claims (2)

The goal is achieved by the fact that the mechanism for returning the support roller to its initial position is made in the form of a clamp installed in the housing coaxially with the support roller and axially spring-loaded, a ball mounted in the support roller shaft and spring-loaded in the radial direction, and the sleeve freely mounted on the support shaft a roller having on one side longitudinal radius grooves, and on the other two protrusions, the sleeve being connected to the second end of the flat spiral spring. On fi.g. 1 shows a thread rolling head, starting position; in fig. 2 shows section A-A in FIG. one; in fig. 3 shows a section BB in FIG. one; in fig. 4 - head, end position. Roller rollers 1 with a circular thread are placed in the housing 2 offset from each other by the amount of thread lift. In the housing along its axis there is a supporting threaded roller 3, on the shank of which the sleeve 4 is placed, provided on one side with longitudinal radius caps 5, and on the other with two projections 6. In one of the radius grooves 5 there is a ball 7 mounted in the hole the shank of the support roller 3 and pressed by the screw 8 and the spring 9. The housing 2 has a flat spiral spring 10, one end of which is fixed to the housing 2 and the other on the sleeve 4, and the retainer 11 with the axial grooves springed in the axial direction of the spring 12. Head works leduyuschim way. In the initial position (Fig. 1), the supporting threaded roller 3 is screwed into the body. The ball 7 is located in one of the grooves 5 of the sleeve 4, the flat spiral spring 10 is in a free state, the latch 11 is fed to the collar of the shank of the threaded roller 3 by the spring 12. Between the grooves of the latch 11 and the projections 6 of the sleeve 4 there is a gap whose size is smaller than the radius grooves 5 of the sleeve 4. When the thread-rolling rollers 1. 1 interact with part 12, the rollers begin to rotate, while the threaded supporting roller 3 begins to rotate and turn out of the housing 2, rotating with the balloon 7 the sleeve 4 and twisting the flat spiral spring 10. Turning out of the housing 2 the threaded support roller 3 moves the ball 7 along the radial groove 5, and the latch 11 under the action of the spring 12 descends until the protrusions 6 enter into their grooves, while the rotation of the sleeve 4 stops and the flat spiral spring 10 stops to twist, leaving tense. When the hub 4 is inhibited, the ball 7 is embedded in the shank of the roller 3 and, by clicking, leaves the hub 4; Further threading is performed at the fixed position of the flat spiral spring (Fig. 4). The tool returns to its original position in the reverse order. Thread rolling rollers 1, rotating in the opposite direction in reverse, rotate the threaded support roller 3 and screw it into the housing 2. The ball 7 enters the sleeve 4 and, being clicked, rotates in it, and the flange of the shank depresses the latch 11, withdraws it from of the protrusions 6. After the slots of the retainer 11 have come out of the protrusions 6 of the sleeve 4, the ball 7 falls into one of the radius grooves 5 of the sleeve 4, and the flat spiral spring 10 turns the threaded support roller 3 to its original position, eliminating its possible preliminary stop due to slippage and thread rolling rollers 1 in reverse to the thread of the part. Claims of the invention: A thread rolling head comprising rollers with a ring thread mounted in the housing, a threaded support roller with a shank and a support roller return mechanism to its original position, having a flat helical spring, one end of which is fixed to the housing, so that capabilities, the mechanism for returning the support roller to its original position is made in the form of a clamp installed in the housing coaxially with the support roller, axially spring-loaded, the ball is mounted ennogo in the shank of the support roller, a spring-loaded in the radial direction. sleeve, freely mounted on the shank support roller, having on one side longitudinal radius grooves, and on the other two protrusions, and the sleeve is connected with the second end of the flat spiral spring. Sources of information taken into account in the examination 1. USSR author's certificate number 354932, cl. B 21 N 3/08, 09.01.71. 2. USSR author's certificate for application number 2517425 / 25-27, cl. B 21 N 3/08, 1976. b - c (reg.