RU2453387C1 - Roller die for production of round pipes - Google Patents

Abstract

FIELD: instrument making.

SUBSTANCE: die comprises a vessel and working and support rollers arranged into them. Non-driven working rollers forming a round calibre comprise three discs. Levelling of metal flow and roller rotation speeds, reduced friction between rotary discs is provided due to the fact that in each disc there are grooves, in addition to which discs and support rollers have a coating from a nanocomposite material. Disc are installed in a bushing on sliding bearings and may freely rotate. The bushing is fixed on the shaft, which is mounted with its eccentric ends in the vessel. On similar shafts with the help of sliding bearings there are support rollers installed, which serve to compensate opening forces in side discs of working rollers in process of drawing. At the ends of shafts there are conical gears installed, during rotation of which radial adjustment of roller position is carried out, for this purpose at the end of one of the shafts there is a wheel installed connected to a worm gear. To provide rotation of the vessel there is a geared rim and a gear connected with an electric drive.

EFFECT: invention is designed to increase quality of pipes produced by drawing.

2 cl, 1 dwg

Description

The invention relates to the field of metal forming, in particular to the production of round pipes.

Known roller die given in (AS USSR No. 1210939, 1986, BI No. 6). The axes of the die on which the rollers are located are eccentric and rotatably mounted, while they are interconnected by gears. One of the axles has a rotation limiter in the form of a lever with a freewheel groove and a screw stop. In the housing along an arc of a circle, holes of step adjustment of the rotation value of the eccentric axes are made. The holes of the latch are arranged with a step equal to the pitch of the lever of the limiter of rotation of the eccentric axes. A disadvantage of the invention is the dependence of the setting of the position of the roller in the radial direction on the step size of the adjustment holes.

It is also known roller device (US Pat. US No. 5144827, 1992), which consists of three rollers, each of which is fixed in a hollow sleeve, supported by ball bearings. The inner ring of the bearings lies on the eccentric shaft, which is installed in the housing using bushings. One of the eccentric shafts has an extension on which a wheel is mounted connected to the worm. The synchronization of changes in the radial position is carried out using bevel gears mounted on eccentric shafts. The disadvantage of this design is the complexity of its installation, as well as the use of a large number of double ball bearings, which complicates maintenance.

As a prototype taken roller device (US Pat. RF No. 2177385, 2001), which is a two-stand block of three-roll stands. The stand block contains a base with uprights, as well as a group radial adjustment mechanism for the rollers. Three pairs of parallel cheeks with holes are fixed to the stand of the stand at an angle of 120 ° to each other, in which rollers are mounted on eccentric axes, the ends of which are interconnected by bevel gears. At the end of one of the eccentric axes, a cylindrical protrusion is made with a worm gear ring cut on it, interacting with a worm mounted on the outer plane of the roller holder cheek. The advantage of this design is, on the one hand, a higher accuracy of the radial adjustment of the rollers, and on the other hand, the relative ease of production and installation of equipment.

A common drawback of all the presented analogues, as well as the prototype is the lack of alignment between the speeds of rotation of the rollers and the flow of metal.

The objective of the invention is the alignment of the flow rates of the metal and the rotation of the rollers, due to which there should be an increase in the quality of the resulting pipes.

This problem is solved in that the roller die for the production of round pipes contains a housing, working and supporting rollers, mechanisms for regulating the radial position of the rollers, installation and rotation mechanisms of the housing in the frame, and the working rollers forming a round caliber are made of three discs, one central and two lateral, disks are made of equal width with two recesses located on the lateral surfaces of the disks symmetrically relative to the axis of symmetry of the disks, and with the possibility of rotation relative to each other other and mounted in the sleeve on the bearings, and the crowns of the support rollers have a gear support surface. The disks of the working rollers, as well as the supporting rollers, are coated with a nanocomposite material.

The proposed device is presented in figure 1, where:

1 - die body;

2 - a reference roller;

3 - the central disk of the working roller;

4 - a side disk of a working roller;

5 - sleeve;

6 - plain bearing;

7 - a cover;

8 - a lock nut;

9 - the shaft of the working roller;

10 - recess;

11 - the shaft of the support roller;

12 - bevel gear;

13 - a worm wheel;

14 - a worm;

15 - fastener;

16 - bandage;

17 - bed;

18 - ring gear;

19 - a gear wheel.

The die consists of a housing 1 and non-driven working rollers and support rollers located in it 2. Non-driven working rollers forming a round gauge, consist of three disks of equal width, one central 3 and two side 4, which can freely rotate independently of each other. Disks are installed in sleeve 5 on thrust sliding bearings 6 and are fixed in it on one side by a collar of the sleeve, and on the other hand by a cover 7 and two nuts 8, which are mounted on the sleeve due to the thread applied to it. The sleeve using a splined connection is mounted on the shaft 9, which is installed in the housing 1 with its ends made eccentrically relative to the main axis of the shafts.

To reduce friction between the disks of the working rollers during rotation, two recesses 10 are made in each of them, located symmetrically with respect to the axis of symmetry of the disks; for the same purpose, the disks and support rollers are coated with a nanocomposite material, which increases the anti-seize and wear-resistant properties of the disk material and friction reducing.

To ensure the required position of the side disks 4 of the working rollers in the axial direction, to compensate for the action on the side disks of the spacer forces during drawing, support rollers 2 are provided, the crowns of which have a toothed bearing surface. The support rollers 2 are installed in the housing 1 by means of the eccentric ends of the shafts 11. The support rollers are mounted on the shafts by thrust sliding bearings 6, identical to the bearings of the disks of the working rollers.

For radial adjustment of the position of the rollers, the use of bevel gears 12 located at the eccentric ends of the stationary shafts 9 and 11, on which the bushes 5 of the rollers and the bearings of the support rollers are installed 6. The bevel gears 12 of the shafts of the working rollers are connected to the bevel gears of the 12 support rollers. The end of one of the shafts 9 of the working rollers has a wheel 13 with a gear rim located on it, connected to the worm 14, during rotation of which there is a sequential rotation of all eccentric ends of the shafts and, accordingly, radial adjustment of the position of the rollers. The assembly of the housing is carried out using a fastener 15. The housing 1 of the roller die is located on the bandages 16 installed in the bed 17. To rotate the housing around its axis, a gear ring 18 is made on it, connected to the gear gear 19. The gear is connected to the electric drive and a brake for turning body and fixing it in a certain position.

To obtain pipes, it is proposed to use two such dies, arranged in series with a rotation of the housing of one dies relative to the other by 60 ° and a diameter of working rollers of the second dies, greater than in the first, which ensures the best quality of the products.

The operation of the device is as follows. The die body 1 is installed in the required position with the drive gear 19. Next, the rollers are adjusted in the radial direction with the help of the worm 14 and bevel gears 12. In the process, a tube on the mandrel is supplied to the device, which is crimped to the required size and then leaves the die entering the next drag, the work of which is carried out according to the same principle. The support rollers 2 during operation provide the position of the side discs 4 of the rollers, providing the necessary rigidity of the caliber, and the independent rotation of the wheels of the working rollers - the required accuracy and quality of products.

The use of such a design of the disks of the working rollers and the support rollers allows their quick change, as well as the possibility of producing pipes of various nomenclatures.

Claims (2)

1. Roller drawing for the production of round pipes, comprising a housing, working rollers forming a round gauge, support rollers, mechanisms for adjusting the radial position of the rollers, installation and rotation mechanisms of the housing in the frame, characterized in that the working rollers are made up of three disks: one central and two side, moreover, the disks are made of equal width with two recesses located on their side surfaces symmetrically with respect to the axis of symmetry of the disks, and are mounted in the sleeve on sliding bearings with POSSIBILITY rotating relative to each other, the crowns of the support rollers have gear supporting surface. 2. The die according to claim 1, characterized in that the disks of the working rollers, as well as the supporting rollers, are coated with a nanocomposite material.