RU105204U1 - TUBE BENDER FOR THIN WALL PIPES - Google Patents

Abstract

 1. A pipe bender for thin-walled pipes, comprising a leading bending roller with a worm screw and a support with a clamping and forming rollers located on the faceplate, characterized in that the support is freely swinging on an axis rigidly fixed to the faceplate relative to the leading bending roller. ! 2. The pipe bender according to claim 1, characterized in that the pinch roller is made with a profile in the form of a semicircle of radius Rf = (0.501-0.55) · Dн, where Dн is the outer diameter of the molded thin-walled pipe. ! 3. The pipe bender according to claim 1, characterized in that the forming roller is made with an ellipsoidal profile with a diameter at the inlet of the roller Din = (1,0005-1,01) · Dn, with a radius Rin at the top of the ellipse Rb = (0,4 -0.44) · Dn and with the depth of the profile Ne at the top of the ellipse Ne = (0.502-0.51) · Dn.

Description

The invention relates to the technique of mechanical shaping of pipe products, in particular to machines and devices for bending thin-walled pipes by winding.

A pipe bender is known (see A. Galperin. Machines and equipment for pipe bending. M. Mechanical Engineering, 1964, Fig. 20.) [1] (see Fig. 1), in which the end of the pipe 1 being formed is rigidly fixed with a clamp 2 relative to the lead bending roller 3. The bending is provided with pinch 4 and molding 5 rollers placed on a support 6, which is moved tangentially relative to the roller 3 using a separate drive. Forced rotation of the roller 3 is provided with a worm screw 7 with a manual or mechanical drive. The required bending angle is provided by the angle of rotation of the drive roller 3 together with the clamp 2 using the worm screw 7. The disadvantage of the prototype is:

the need to use carbide fold-smoothing (mandrel) with a bending radius Rg≤5 Dн, where Dн - the outer diameter of the formed pipe 1;

- increased drive force of the drive roller 3, especially when using a mandrel;

- significant distortion of the profile of the formed pipe at the bend.

The objective of the utility model is to ensure high quality bending of thin-walled pipes and simplifying the device in terms of refusing to use a folding smoothing device with a bending radiance Rg≥2 Dн.

To achieve the task, the support, on which the pinch and forming rollers are placed, is made freely swinging on an axis rigidly mounted on the faceplate relative to the bending roller, and the profile of the pinch roller is made with a radius Rf = (0,501-0,55) · Dн, and the molding profile the roller is made ellipsoidal with a diameter at the entrance to the roller Din = (1,0005-1,01) · Dн, with a radius at the top of the ellipse Rв = (0,4-0,44) · Дн and with the depth profile Ne at the top of the ellipse Ne = (0.502-0.51)

The structure of the proposed pipe bender is shown in figure 2. Figure 3 shows the profiles of the pinch 4 and molding 5 rollers, the photo of figure 4 shows samples of thin-walled pipes formed by a pipe bender of figure 2. The device for bending the pipe 1 contains a clamp 2, rigidly connected to the drive roller 3 located on the faceplate (not shown). The presser 4 and molding 5 rollers are placed on the swinging support 6. The drive of the bending roller 3 is provided from the worm screw 7, and the movable support of the support 6 on the faceplate is provided on axis 8. When rotating through the worm screw 7 of the bending roller 3, the pipe 1 fixed in the clamp 2 is wound on the roller 3, at the same time the upper part of the pipe profile is formed by the profiles of the rollers 4 and 5. By pressing the pipe 1 to the upper roller 3 part of her profile acquires a characteristic shape that is different from the semicircle. Subsequent pulling of the pipe 1 through the forming roller 5 provides the correction of its upper profile to a semicircle without the use of a mandrel. In figure 1 and figure 2, the positions 2 'and 1' indicate the elements 1 and 2 in the final state, after the bending molding process. The profile of the pinch roller 4 (see Fig. 3) is made in the form of a semicircle of radius Rf = (0.501-0.55) · Dn, the profile of the molding roller 5 is made ellipsoidal with a diameter at the inlet of the roller Din = (1.000-1-1.01 ) · Дн, with a radius at the apex of the ellipse Rв = (0.4-0.44) · Дн and with a profile depth of Ne at the apex of the ellipse Ne = (0.502-0.51) · Дн.

The movable mounting of the support 6 on the axis 8 provides an adaptive position of the rollers 4 and 5 relative to the bending roller 3 for pipes of various materials - from aluminum to steel of various grades.

The photo of figure 4 shows samples of bends of thin-walled pipes made by the proposed device. The bending profile corresponds exactly to the circumference, there are no folds on the bend, the bending quality is excellent both in copper and steel samples. Simplification of the process of bending thin-walled pipes without the use of carbide mandrel reduces the pulling force of the pipe with high quality molding. The proposed version of the device

Claims (3)

1. A pipe bender for thin-walled pipes, comprising a leading bending roller with a worm screw and a support with a clamping and forming rollers located on the faceplate, characterized in that the support is freely swinging on an axis rigidly fixed to the faceplate relative to the leading bending roller. 2. The pipe bender according to claim 1, characterized in that the pinch roller is made with a profile in the form of a semicircle of radius Rf = (0.501-0.55) · Dн, where Dн is the outer diameter of the molded thin-walled pipe. 3. The pipe bender according to claim 1, characterized in that the forming roller is made with an ellipsoid profile with a diameter at the inlet of the roller Din = (1,0005-1,01) · Dn, with a radius Rin at the top of the ellipse Rb = (0,4 -0.44) · Dn and with the depth of the profile Ne at the top of the ellipse Ne = (0.502-0.51) · Dn.