SU1538974A1 - Thread-rolling head - Google Patents

Abstract

The invention relates to the processing of metals by pressure and can be used for rolling external threads on hollow parts. The purpose of the invention is to improve the quality of the thread being rolled by simultaneously rolling the thread and calibrating the workpiece in diameter. The head is equipped with a calibrating mechanism, made in the form of a spring-loaded expanding cone, a separator with inclined grooves, in which there are conical roll rollers installed with the ability to interact with the expanding cone, and a spring-loaded cage covering the roll rollers with a cylindrical shoulder for interaction with the rear end plane of the cartridge, which installed thread rolling rollers. Thread rolling is performed by diluting the rolls inside the workpiece by axially moving the expansion cone. 1 hp f-ly, 6 ill.

Description

The invention relates to the processing of metals by pressure and can be used for rolling external cylindrical threads on hollow parts.

The purpose of the invention is to improve the quality of the thread being rolled by simultaneously calibrating the workpiece in diameter with rolling.

FIG. 1 schematically shows the proposed thread rolling head, a general view; in fig. 2 is a section A-A in FIG. one; in fig. 3 is a section BB in FIG. one; in fig. 4 shows a section B-B in FIG. one; in fig. 5 - the position of the roll rollers in the separator; in fig. 6 - thread rolling head at the time of the end of thread rolling, general view.

The thread rolling head comprises a housing 1, in the central hole of which is mounted with the possibility of axial movement of the cartridge 2. In the radial grooves made in the cartridge at an angle of 120 ° relative to one another, axes 3 are installed with the possibility of rotation, for example

three thread rolling rollers 4. With a larger number of rollers, the angle between them is 360 ° / l, where and is the number of thread rolling rollers. Axis 3 is rotated to the elevation angle of the thread being rolled. Inside the housing 1 and the cassette 2 is installed a separator 5 with rollers 6, turned at an angle a to the axis of the separator 5 displaced along an arc of a circle relative to the thread rolling rollers at an angle of 60 °. When the angle of displacement is 360 ° / 5p (the number of rollers is equal to the number of thread rolling rollers). The separator 5 with the housing 1 is connected via a square shank (Fig. 4). Inside the separator 5, there is an expanding cone 7, which interacts with the rolling rollers 6 and is equipped with a cylindrical shank 8 on which a shoulder is made and a spring 11 is pressed between two washers 9 and 10 and is pressed on the shank by nuts 12 on the separator 5. roll rollers 6 falling out of the groove of the separator 6. Between work

wasp

00

with l

four

my 13 and the end inside the case have a spring 14, which in the initial position of the rolling head squeezes the holder 13 and the cartridge 2 interacting with the inner end of the cassette 2 with thread rolling rollers 6. The holder 13 has the possibility of axial movement, all the way into the shoulder with which the separator 5. the clip 15 is radially mounted, held from accidental falling out of the spring ring 16, and in the separator radial grooves are made through which the pins interact with the washer 9 and the collar on the shank 8. By turning in the case 1 of the cassettes 2 is held by a key 17 secured to the housing with screws 18. Fixing the extreme positions of the mandrel during its axial movement is performed by a ball lock 19 mounted on the housing. To visually monitor the movements of the cartridge 2 in the housing, an indicator 20 is made in the form of a pin pressed into the cartridge 2 and out through the groove in the housing wall to the outside. The extreme positions of the pointer are marked by risks on the outer surface of the housing (not shown). The device is set up to obtain a full thread profile on a hollow workpiece 21 by changing the stroke length of the expanding cone 7 inside the separator 5 while unscrewing or screwing in the stop 22. The stop is fixed by screw 23. The cutting head is fixed to the tailstock quills of the lathe and the workpiece - in the chuck and tell her to rotate.

Thread rolling head works as follows.

Turning on the rotation of the machine spindle, insert the separator 5 into the hole in the hollow billet 21 until the end of the pipe, acting on the end of the sleeve 13, displaces the latter until it stops at the shoulder on the separator. In this case, the spring 14 is compressed, and the cassette 2 is held in its initial position by a ball retainer 19. When axially moving along the separator 5, the sleeve 13 acts on the washer 9 with pins 15, sliding along the slots of the separator 5. compresses the spring 11 mounted on the shank 8, due to which the expansion cone 7 is displaced along the axis, pushes the rolling rollers b and brings them into contact with the inner surface of the hollow billet. The rollers 6 rolling around the inner surface of the pipe rotate and cause the sliding cone to rotate, which is now due to the angle of inclination of the axis of the rollers to the axis of the support cone axially, and the rollers 6 move apart. i.e. an increase in its diameter. As soon as the thread-rolling rollers 4 touch the outer surface of the workpiece 21, the process of forming the thread profile and unscrewing the part from the thread rolling head, in which the thread-rolling tape cassette 2 begins

rollers 4, overcoming the force of the spring clamp 19, moves in the axial direction relative to the housing 1. To obtain a complete thread profile, 2-3 turns of the workpiece are sufficient, while the expansion cone 7 moves in the opening of the separator 5 until it contacts the stop with the stop. With further rotation, the thread profile is calibrated. After rolling threads on the machined part, the latch 19 fixes the cartridge 2 in the new

position (Fig. 6), and the pointer 20 is aligned with the risk on the housing 1. To remove the screw 23 from the thread rolling head, make 1-2 turns in the opposite direction, resulting in a sliding cone 7 inside

The separator 5 is moved along the axis in the opposite direction and is eliminated by tension between the inner surface of the workpiece 21, the rollers b and the sliding cone 7. When the thread rolling head is withdrawn from the machined part, the yoke 13

5 returns the spring 14 to its original position and closes the rolling rollers 6, preventing them from falling out. Under the action of the spring 14, the yoke 13 interacts with the cylindrical collar with the end plane of the cassette 2, and the pins 15 with the collar on the cylindrical shank of the sliding cone 7, returning them to their original position, after which the device is ready for processing the next part. In order to ensure a full thread profile over the entire length of the rolled pipe, the length of the thread rolling rollers 4 must be 2-3 thread steps longer than the length of the rolling rollers 6.

The thread rolling head allows the thread to roll on the hollow parts of the hole while simultaneously calibrating the diameter of the workpiece, which improves the quality of the thread being machined.

Claims (2)

Invention Formula 5 1. A thread rolling head, comprising a housing, a cassette with front and rear end planes, mounted inside the housing with the possibility of axial movement, characterized in that, in order to improve the accuracy of the thread being rolled, 0 simultaneous with rolling calibration of the workpiece in diameter, the head is equipped with a calibration mechanism, made in the form of a spring-loaded expanding cone, a separator with inclined grooves, in which conical roll rollers are installed, which are installed with the possibility of interaction with a expanding cone, and covering the rolled rollers of a spring-loaded cage with cylindrical burt 0 five for interacting with the back face plate rollers on bone cassette, with a separator stiffness mounted on the body, and the holder is connected to the expansion cone. 2. The thread rolling head according to claim 1, is different from the fact that there are smooth tapered roles — where ki shifted relative to thread - number of set angle C determined by swirl 360 yy- the number of thread rolling rollers included. at T H 7 AT L- 12 YU Riga.1 Schig.g 6-5 Fig.z nineteen In In (I and r. 4 22 23 Schi 5