CN105817510A - Bend forming method controlling distortion - Google Patents

Abstract

The invention discloses a bending forming method for controlling distortion. On the basis of the original bending forming by filling fine sand inside the pipe or supporting with a low melting point to prevent pipe distortion during the forming process, the external anti-distortion control measures of the pipe are added, specifically The method includes the following steps: A. filling the inside of the pipe part with fine sand for support; B. restricting the width of the pipe part from the outside to limit the deformation of the two side walls of the rectangular cross-section pipe when it is bent and formed, and to control the side wall of the rectangular cross-section during the bending and forming process. The wall pipe material flows freely; C. Limit the height of the pipe parts from the outside, limit the clamping height of the upper and lower molds, and prevent the bending part of the pipe from being unstable and distorted by the impact force of the upper and lower molds; D. Bending processing. The present invention adopts the bending and forming stamping equipment for controlling the distortion of aluminum alloy thin-walled pipe parts with large aspect ratio rectangular section, adopts the press machine, and slowly stamps and forms to prevent the distortion caused by the rapid flow of materials during rapid stamping.

Description

A Distortion Controlled Press-bending Forming Method

technical field

The invention belongs to the field of pipe forming, and in particular relates to a bending forming method for controlling distortion.

Background technique

When the bending of rectangular section pipes cannot be formed by the general stretch bending method and winding method, die bending or pressure bending is usually used. This method has a simple mold structure, easy operation, high production efficiency, and saves raw materials, which is more suitable for aviation. Sheet metal scientific research and small batch production.

Pipe bending forming is to use the upper and lower dies of the forming tool installed on the stamping equipment to realize the bending of the pipe. Pipe bending forming tooling is usually composed of upper and lower dies. The upper and lower dies have the forming angles of the formed parts respectively. The upper die is installed and fixed on the upper table of the stamping equipment, and the lower die is installed and fixed on the lower table of the stamping equipment. When forming, the parts to be formed are placed on the lower mold, the stamping equipment is started, and the upper table of the stamping equipment is driven downward, and the pipe placed on the lower mold is bent until it fits with the lower mold to realize the forming of the part.

The profile of the pipe formed by bending is prone to distortion. In order to avoid this phenomenon, the inside of the pipe is usually filled with fine sand or low melting point alloy and then formed by bending. When rectangular cross-section pipe parts are formed by press bending, sometimes even though the interior is filled with fine sand or low melting point to support the pipe wall, the cross-section still produces bulges, depressions and other distortions during forming, which affects the quality and service life of the parts, especially for pipes with long cross-sections. Aluminum alloy pipes with large width ratios are more prone to distortion when bending narrow sections.

Contents of the invention

The technical problem to be solved by the present invention is to provide a new press-bending forming process capable of effectively controlling section distortion, and improve the bending-forming quality of rectangular-section pipe parts.

In order to solve the above problems, the technical solution of the present invention provides a deformation-controlling bending forming method. On the basis of the original bending forming by filling the inside of the pipe with fine sand or low melting point support to prevent pipe distortion during the forming process, the external anti-corrosion of the pipe is added. Distortion control measures specifically include the following steps:

A. Fill the inside of the pipe parts with fine sand support;

B. Limit the width of the pipe part from the outside, restrict the deformation of the two side walls of the rectangular cross-section pipe when it is bent and formed, and control the arbitrary flow of the rectangular cross-section side wall pipe material during the bending and forming process;

C. Limit the height of the pipe parts from the outside, limit the clamping height of the upper and lower molds, and avoid the instability and distortion of the bending part of the pipe due to the impact force of the upper and lower molds;

D. Bending processing.

Preferably, the step B uses the lower mold to have a cavity structure with the same width as the part to realize the anti-bulging of the side during the bending forming process; the step C is to use the tooling structure to make the minimum distance between the upper and lower molds Spacing is limited to the height of rectangular section tubing.

The beneficial effect of the present invention is that the bending and forming stamping equipment with large aspect ratio rectangular section aluminum alloy thin-walled pipe parts is used to control distortion, and the press is used to slowly stamp and form, so as to prevent the distortion caused by the rapid flow of materials during rapid stamping.

Description of drawings

Below in conjunction with accompanying drawing, specific embodiment of the present invention is described in further detail, wherein:

Fig. 1 is the bending forming schematic diagram of the present invention;

Fig. 2 is a structural form A-A view of the mold of the present invention.

Among them: 01 is the upper template, 02 is the upper mold, 03 is the lower mold of the cavity, 04 is the screw assembly, 05 is the lower template, 06 is the diagram before the part is bent, 07 is the diagram after the part is bent, and 08 is the lower mold of the splint.

detailed description

Example

Process preparation

Manufacture the bending die according to the product design, the structure of the upper and lower dies, the lower die has a cavity with a rectangular cross-section pipe width, and the cavity is made into a split structure with splints clamped laterally to facilitate placing and picking up parts, upper and lower Mold clamping limit device;

manufacturing

blanking;

Degreasing, removing dirt and impurities on the surface of the square tube;

Falling burrs, smoothing the edge of the material, avoiding injury to the operator and scratching other products and molds;

The inside of the pipe is filled with fine sand support;

The parts are fixed, and the narrow section of the rectangular pipe part is placed on the lower mold of the 03. cavity. The lower mold of the 08. splint is driven by the screw assembly of 04. and slides closer to the lower mold of the 03. cavity. The lower mold of the 03. cavity and the 08. The lower mold of the splint forms a cavity with the same width as the narrow section of the rectangular pipe, so as to keep sliding with the parts;

Bending forming, the press drives the 02. upper die fixed on the 01. upper template slowly descends to touch the pipe part and then continues to descend until the shoulder of the 02. upper die contacts the shoulder of the lower die of the 03. cavity and stops descending, the pipe is bent, End of bending forming;

Unloading, the press drives the 02. upper die fixed on the 01. upper template to move upward, and the 02. upper die leaves the cavity formed by the 03. lower die and the 08. splint lower die, and the splint lower die is on the 04. lead screw Driven by the component, it slides and separates from the lower mold of the 03. cavity to ensure that the parts are unloaded from the mold without pulling, and the parts are taken out;

Remove the inner filling of the pipe;

Inspection, checking product quality according to drawings and related technical requirements;

Degreasing, removing oil stains generated during processing, etc.;

Marking, marking the product drawing number, production date, etc.

Claims (2)

1. A bending forming method for controlling distortion, characterized in that on the basis of the original bending forming by filling fine sand inside the pipe or supporting with a low melting point to prevent pipe distortion during the forming process, an external anti-distortion control measure for the pipe is added , including the following steps: A. Fill the inside of the pipe parts with fine sand support; B. Limit the width of the pipe part from the outside, restrict the deformation of the two side walls of the rectangular cross-section pipe when it is bent and formed, and control the arbitrary flow of the rectangular cross-section side wall pipe material during the bending and forming process; C. Limit the height of the pipe parts from the outside, limit the clamping height of the upper and lower molds, and avoid the instability and distortion of the bending part of the pipe due to the impact force of the upper and lower molds; D. Bending processing. 2. The method according to claim 1, characterized in that, in the step B, the cavity structure with the same width as the part is formed by the lower molding to realize the anti-bulging of the side during the bending forming process; the step C is The minimum distance between the upper and lower dies is limited to the height of the rectangular section pipe through the tooling structure.