SU1291238A1 - Arrangement for bending tubes - Google Patents

Abstract

The invention relates to devices for bending pipes in a cold state and allows improving the quality of pipes that are bent without mandrels by providing adjustment of tensile longitudinal forces. The device contains a clamping slider (P) 4 installed in the housing 5, moving reciprocating along the axis of the pipe 6 along the roller guide 7 and placed on both sides of the P friction adjustment nodes between the P 4 and the housing 5. Before the flexible device is configured, creating additional resistance to friction of the slider 4. This makes it possible to obtain the necessary tensile forces of the pipe being bent. Then the pipe billet is bent by winding on the template 1. 2 Cp. F-crystals, 3 Il. with S AA SL

Description

112

The invention relates to pipe and tube production, in particular to the structures of devices for cold bending pipes.

The purpose of the invention is to improve the quality of products by providing the ability to adjust the longitudinal tensile forces of the bent pipe.

In Fig.1, the image but the device, top view; figure 2 - section aa in figure 1; on fig.Z - type BB in figure 2.

The device contains a bending template 1 with a stream, mounted on the axis of the drive 2, clamp 3, the pressure slide

4c stream moving in enclosure

5 when bending the tube 6 and returning idle back along the roller guide 7.

The device is equipped with units for adjusting the friction forces between the pressure slider 4 and the body 5, each of which is made in the form of a prismatic bar 8 with a flat base and a profiled working surface mounted with a flat base (vanity to the body 5, and profiled working surface to the slider, at the same time, the profiled working surface is made in the form of a section 9 and the protrusion 10 adjacent to it at the base of the base 9. The friction force adjustment unit between the pressure slide 4 and the body 5 also contains a profile A special stop 11 connected to the slider 4, made with a rounded tip and interacting with the section 9 and the protrusion 10 of the prismatic bar 8 (with the last face facing the bending axis). The bars 8 are fixed to the housing 5 with adjustment screws 12 with lock nuts 13 and bolts 14. Roller guide 7 is made in the form of a sleeve 15 having an I-beam profile, in the walls of which transverse grooves are cut, where rollers 16 are placed, held from falling out by plates with a figured edge 17. Rollers 16 are made of a material with greater hardness, I eat stuff slide and hob. 18, installed between the housing and the rollers.

The device works as follows.

Pipe blank 6 is installed in a bending device., Fix 82

Clamps 3 with force P in the working profile formed by the streams of template 1 and clamp 3.

The clamp 19 through the housing 5, the base 18, the rollers 16 and the slider 4 onto the tubular blank 6 with the force P creates the necessary lateral force of calibration and bending with simultaneous formation of the amount of rolling friction

slider, i.e. by creating longitudinal tensile forces for compressing the inner and stretching the outer walls of the flexible member, it is smaller in magnitude than is required to perform the bending.

0

By adjusting screws 12, prismatic strips 8 with some tension are applied to stops 11 and screws 12 are fixed with lock nuts 13. The drive is engaged. The template 1, which sits on the axis of the drive, comes into rotation in the direction of the arrow (figure 1). A bending pipe, which creates an elastic load at the points of contact between the stops 11 of the slider 4 and the slider 8, produces a wedge effect on the slider 4, thereby increasing its inhibition and creating additional force, and stretching. These forces, combined with the tensile forces generated by the clamp 19 during calibration and bending, make up the amount required for compressing the internal and expansion of the outer walls of the pipe being bent and give the necessary ratio of lateral forces of calibration and bending with tensile forces.

When the pipe is bent to the required amount, the drive is turned off, the clamp 3 and the clamp 19 are released, the calibration force is removed due to the elastic load in the roller guide, the slider 4 is pushed out of the strips 8 and freely returned to its original position held by the lateral displacement in sections 9 of the strips 8 .

If the bend of the first pipe has deviations from the established requirements, adjustment is made by the adjusting screws 12 to press the strips against the slider 4 until the forces at the bend site correspond to the bending forces with the pressing and calibration forces.

Claims (3)

1. A device for bending pipes, mainly a bottomless one, containing a rotary bending template with a stream, a pipe clamping mechanism installed in a housing with the possibility of reciprocating movement along the axis of the pipe along a roller guide, a pressure slide with a stream, characterized in that product quality by providing the ability to adjust the longitudinal tensile forces in a bent pipe, it is equipped with friction force adjustment knobs located on both sides of the pressure slide the slide and the housing. 2. The device according to Claim 1, m and t is that each knot of friction force adjustment between the pressure slide and the body is made in the form of a prismatic plate with a flat base and a shaped working surface installed five 0 five a flat base to the body, and a profiled working surface - to the slider, as well as a profile stop on the slider with a rounded tip; the bar is installed with the possibility of adjusting the displacement relative to the body towards the slider, and its profiled working surface is made in the form a section inclined in cross section to the base, which is arranged to interact with the rounded apex of the guiding element of the slide and the protrusion adjacent to it, which is arranged to from interaction with the guide face of the slide member facing the , axes are flexible. 3. Device Popp. 1 and 2, characterized in that the roller guide is made in the form of a clip with grooves mounted rigidly in the housing, the rollers are installed in the slots of the clip and are made of a material with a hardness exceeding that of the materials of the housing and the slide. 1