CN214184755U

CN214184755U - Stepping small-curvature pipe bending forming device

Info

Publication number: CN214184755U
Application number: CN202022785430.2U
Authority: CN
Inventors: 董晓宾; 惠渊博
Original assignee: MCC SFRE Heavy Industry Equipment Co Ltd
Current assignee: MCC SFRE Heavy Industry Equipment Co Ltd
Priority date: 2020-11-26
Filing date: 2020-11-26
Publication date: 2021-09-14
Anticipated expiration: 2030-11-26

Abstract

The utility model discloses a stepping small-curvature pipe bending forming device, which is characterized by comprising an upper die and a lower die; the upper die is arranged on an upper workbench of the press machine through a connecting bracket; the lower die is placed on a lower workbench of the press; and a thin-wall steel pipe to be bent is placed between the upper die and the lower die. The die is simple to manufacture, low in cost, attractive in pipe fitting forming after bending, high in efficiency and suitable for manufacturing any thin-wall pipe fitting. The pipe fitting is restrained by the die to deform outwards by expansion force during bending, and the pipe fitting is fed at a short distance and bent at a small curvature. Thereby achieving the effect that the shape of the steel pipe is small, the deformation curvature can be adjusted at will.

Description

Stepping small-curvature pipe bending forming device

Technical Field

The utility model belongs to the technical field of the pipe fitting bending apparatus, a step-by-step small curvature pipe fitting bending apparatus is related to.

Background

The bending of the steel pipe is an important process in the mechanical manufacturing, and the thin-wall steel pipe becomes a hot spot for the development of the fields of water supply, oil supply, hot steam and the like of various domestic steel mills. The existing pipe fittings with bent parts comprise elbows, bridges and the like, and have the defects of more welding lines, difficult stress relief and easy cracking in welding areas; the other is manufactured by adopting a mechanical pipe bender, because the pipe wall is thin, the pipe is stressed by two lateral forces of the inner side and the outer side, the pressure expands towards the two sides, and the pipe is easy to collapse, particularly, a pipe fitting with a small bending radius is easy to collapse, and the pipe is scrapped. Although sand is poured into the pipe, the phenomenon of buckling happens occasionally. In addition, in the bending process, sometimes the outer side of the pipe wall is thinned, the inner side of the pipe wall is seriously wrinkled, the roundness of the bent pipe cannot be guaranteed, the appearance is not attractive, and the quality requirement of the pipe cannot be met.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a step-by-step little curvature pipe fitting bending apparatus has the crooked position steel pipe of effectual control and warp in the pipe fitting manufacturing process to need not irritate the characteristics that the curved flat circularity problem of pipe fitting just can be solved to the sand.

The technical scheme adopted by the utility model is that the bending forming device for the stepping small-curvature pipe fitting is characterized by comprising an upper die and a lower die; the upper die is arranged on an upper workbench of the press machine through a connecting bracket; the lower die is placed on a lower workbench of the press; and a thin-wall steel pipe to be bent is placed between the upper die and the lower die.

The upper die is in a semicircular cake shape, and the outer edge of the upper die is provided with a smooth arc-shaped groove.

The bottom of the lower die is horizontal, and the top of the lower die is provided with a sunken groove.

The central radius R1 of the bent pipe fitting of the upper die is smaller than the central radius R1 of the bent pipe fitting of the lower die by 5-10 mm.

The outer radius r2 of the bent pipe fitting of the lower die is 1-2mm smaller than the bent outer radius of the pipe fitting.

The outer radius r2 of the bent pipe of the lower die is in smooth transition with the boundaries of the straight edges at two sides.

The utility model has the advantages that:

the utility model discloses a hydraulic press cooperation is step-by-step little curvature pipe fitting bending forming technique, and the mould is made simply, and is with low costs, and the pipe fitting shaping is pleasing to the eye after the bending, and is efficient, is suitable for any thin-walled tube spare preparation. The pipe fitting is restrained by the die to deform outwards by expansion force during bending, and the pipe fitting is fed at a short distance and bent at a small curvature. Thereby achieving the effect that the shape of the steel pipe is small, the deformation curvature can be adjusted at will.

Drawings

FIG. 1 is a front view of an upper mold of the bending apparatus for step-by-step bending of small-curvature pipes of the present invention;

FIG. 2 is a front view of a lower mold of the bending apparatus for step-by-step bending of small-curvature pipes of the present invention;

FIG. 3 is a left side sectional view of an upper surgical mold of the bending and forming device for a step-by-step small-curvature pipe of the present invention;

FIG. 4 is a left side view of the lower mold of the step-by-step small curvature pipe bending device

Fig. 5 is the whole structure diagram of the step-by-step small-curvature pipe bending and forming device of the present invention.

In the figure, 1, a connecting support, 2, an upper die, 3, a thin-wall steel pipe and 4, a lower die are arranged;

r1 is the central radius of the upper die bent pipe fitting, and R2 is the inner radius of the bent pipe fitting;

r1 is the central radius of the bent pipe fitting of the lower die, and r2 is the outer radius of the bent pipe fitting;

h is the height of the bending arc length of the thin-wall steel pipe.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.

As shown in fig. 4, a bending and forming device for a stepped small-curvature pipe comprises an upper die 2 and a lower die 4; the upper die 2 is arranged on an upper workbench of the press machine through a connecting bracket 1; the lower die 4 is placed on a lower workbench of a press machine; and a thin-wall steel pipe 3 to be bent is placed between the upper die 2 and the lower die 4.

As shown in fig. 1-2, the upper die 2 is in a shape of a semicircular pie, and the outer edge of the upper die is provided with a smooth arc-shaped groove.

As shown in fig. 3-4, the lower mold 4 is horizontal at the bottom and has a depressed groove at the top.

The central radius R1 of the bent pipe fitting of the upper die 2 is smaller than the central radius R1 of the bent pipe fitting of the lower die 4 by 5-10 mm. This facilitates bending of the thin-walled steel tube 3 having an arc greater than 180 degrees.

The outer radius r2 of the bent pipe of the lower die 4 is 1-2mm smaller than the outer radius of the bent pipe. Thus being convenient for eliminating the rebound after the external force of the steel pipe bend is removed.

The outer radius r2 of the bent pipe of the lower die 4 is in smooth transition with the boundaries of the straight edges at the two sides. This does not cause scratching of the tube when it is bent.

The height H in FIG. 2 determines the chord length of R2 and also determines the arc length of the bent steel tube, and the larger the diameter of the tube, the thinner the wall thickness of the tube, and the smaller the height H; conversely, the larger.

The inner radius R2 of the bent pipe fitting is pressed down to contact with the outer radius R2 of the bent pipe fitting to form an outer circle of the steel pipe, so that the outward two force expansion forces are applied when the bent pipe fitting is restrained, and the pipe fitting cannot be collapsed.

The utility model discloses a concrete operation process as follows:

step 1, installing and fixing an upper die 2 and a lower die 4 on a press according to a figure 5;

and 2, calculating the bending arc length of the pipe fitting to be bent, marking the bending position, placing the pipe fitting in a sunken groove of the lower die 4, and then forming the bending center part.

Claims

1. A stepping small-curvature pipe bending forming device is characterized by comprising an upper die (2) and a lower die (4); the upper die (2) is arranged on an upper workbench of the press machine through a connecting bracket (1); the lower die (4) is placed on a lower workbench of a press machine; and a thin-wall steel pipe (3) to be bent is placed between the upper die (2) and the lower die (4).

2. The bending and forming device for the small-curvature stepped pipe fitting according to claim 1, wherein the upper die (2) is semicircular pie-shaped, and the outer edge of the upper die is provided with a smooth arc-shaped groove.

3. The progressive low-curvature pipe bending apparatus of claim 1, wherein said lower die (4) is horizontal at the bottom and has a depressed groove at the top.

4. A progressive small-curvature tube bending apparatus according to claim 1, wherein the radius R1 of the center of the bent tube of said upper die (2) is smaller than the radius R1, 5-10mm of the center of the bent tube of said lower die (4).

5. The apparatus for stepwise bending and forming a pipe having a small curvature according to claim 1, wherein the outer radius r2 of the bent pipe of the lower die (4) is 1-2mm smaller than the outer radius of the bent pipe.

6. The bending and forming device for the stepped small-curvature pipe fitting of claim 1, wherein the outer radius r2 of the bent pipe fitting of the lower die (4) is in smooth transition with the boundary of two straight sides.