CN111604401A

CN111604401A - Bulging device

Info

Publication number: CN111604401A
Application number: CN202010454674.4A
Authority: CN
Inventors: 龚峰; 张灿滨; 陈凯哲; 闫超; 李康森
Original assignee: Shenzhen University
Current assignee: Shenzhen University
Priority date: 2020-05-26
Filing date: 2020-05-26
Publication date: 2020-09-01
Anticipated expiration: 2040-05-26
Also published as: CN111604401B

Abstract

The application discloses bulging device, it is used for carrying out the bulging to being hollow structure's tubular product, and wherein, tubular product is equipped with and remains the bulging district, and the bulging device includes: the fixing structure comprises a lower die base and an upper die base stacked with the lower die base, wherein the lower die base is provided with a lower through hole, the upper die base is provided with an upper through hole at a position corresponding to the lower through hole, and two ends of the pipe are respectively clamped in the upper through hole and the lower through hole; the forming structure comprises a forming template with a forming die cavity, a flexible medium arranged in the pipe and a punch for pushing the flexible medium, the forming template is fixed between the upper die holder and the lower die holder, the forming die cavity is of a through hole structure, the pipe penetrates through the forming die cavity, the to-be-expanded area is located in the forming die cavity, the inner diameter of the forming die cavity is larger than the outer diameter of the pipe, and the punch pushes the flexible medium downwards under the action of external force. This application is through the flexible medium towards the pipe wall in the forming die intracavity extrusion area of treating the bulging, finally makes tubular product take place the bulging.

Description

Bulging device

Technical Field

The invention belongs to the technical field of pipe bulging forming, and particularly relates to a bulging device.

Background

The pipe fitting is a mechanical part widely used in the automotive, marine and aerospace industries. The development trend that the light weight, the obdurability, the low consumption and the high efficiency of the product are realized into the modern manufacturing technology is realized, and the pipe fitting is of a hollow structure, so that the weight can be reduced, the material can be saved, and the strength and the rigidity of the material can be fully utilized; meanwhile, compared with traditional forming processes such as welding casting, machining and the like, the pipe bulging process belongs to net forming, and is high in material utilization rate, low in cost and high in efficiency, so that the pipe bulging is rapidly developed, and plays an important role in the modern industry.

Disclosure of Invention

An object of the embodiment of this application is to provide an expanding device, aims at solving the problem how to carry out the bulging to tubular product.

In order to achieve the purpose, the technical scheme adopted by the application is as follows: the utility model provides an expanding device for being the tubular product of hollow structure carries out the bulging, wherein, the tubular product is equipped with and remains the bulging area, expanding device includes:

the fixing structure comprises a lower die base and an upper die base stacked with the lower die base, wherein the lower die base is provided with a lower through hole, the upper die base is provided with an upper through hole at a position corresponding to the lower through hole, and two ends of the pipe are respectively clamped in the upper through hole and the lower through hole; and

the forming structure comprises a forming template with a forming die cavity, a flexible medium arranged in a pipe and a punch for pushing the flexible medium, wherein the forming template is fixed between the upper die holder and the lower die holder, the forming die cavity is of a through hole structure, the pipe penetrates through the forming die cavity, the to-be-expanded area is located in the forming die cavity, the inner diameter of the forming die cavity is larger than the outer diameter of the pipe, and the punch pushes the flexible medium downwards under the action of external force, so that the flexible medium drives the pipe wall of the to-be-expanded area to expand towards the forming die cavity.

In one embodiment, the flexible medium comprises a polymer powder.

In one embodiment, the flexible media further comprises a lubricating powder mixed with the polymeric powder.

In one embodiment, the lubricating powder is molybdenum disulfide powder, or the lubricating powder is graphite powder.

In one embodiment, the forming structure further comprises an ultrasonic system for driving the punch to vibrate, and the punch fuses the polymer powder into a sticky shape during vibration.

In one embodiment, the inner diameter of the tubing is greater than the outer diameter of the punch.

In one embodiment, the outer diameter of the tubing is equal to the inner diameter of the lower through hole, and the outer diameter of the tubing is equal to the inner diameter of the upper through hole.

In one embodiment, the bulging device further comprises a heating structure, the heating structure comprises a heating seat with a fixed cavity and a heating tube connected with the heating seat, the lower die seat, the upper die seat and the forming template are all located in the fixed cavity, a heating hole communicated with the fixed cavity is further formed in the side wall of the heating seat, and the heating tube is arranged in the heating hole and one end of the heating tube is abutted to the forming template.

In one embodiment, the bulging device further comprises a guide block, the guide block is arranged above the upper die holder in a stacked mode, a guide hole is formed in the position, corresponding to the upper through hole, of the guide block, and the punch is inserted into the pipe through the guide hole.

In one embodiment, the expanding device of item, characterized by: the fixing structure further comprises a bottom plate, and the lower die holder is fixed on the bottom plate.

The beneficial effect of this application lies in: the pipe is penetrated through the forming die cavity, the two ends of the pipe are respectively fixed to the upper through hole and the lower through hole, the flexible medium is pushed downwards through the stretcher, the flexible medium extrudes the pipe wall of the to-be-bulging area towards the forming die cavity, and finally the pipe is bulged.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

FIG. 1 is a cross-sectional view of an expanding device provided in accordance with an embodiment of the present application;

FIG. 2 is an enlarged fragmentary view at A of the expanding device of FIG. 1;

fig. 3 is a cross-sectional view of an expanding device provided in accordance with yet another embodiment of the present application.

Wherein, in the figures, the respective reference numerals:

100. a bulging device; 10. a fixed structure; 11. an upper die holder; 12. a lower die holder; 13. a base plate; 20. forming a structure; 21. a punch; 22. a flexible medium; 23. forming a template; 50. a pipe; 51. a region to be expanded; 30. a guide block; 31. a guide hole; 111. an upper through hole; 121. a lower through hole; 60. a heat generating structure; 61. a heating base; 62. a heat generating tube; 231. and forming a mold cavity.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

Referring to fig. 1 and fig. 3, an expanding device 100 for expanding a tube 50 is provided, in which the tube 50 is a hollow structure, and the tube 50 is provided with an area 51 to be expanded. Optionally, the tubing 50 is made of copper. The expanding device 100 comprises a fixed structure 10 and a forming structure. The fixing structure 10 includes a lower die base 12 and an upper die base 11 stacked on the lower die base 12. The lower die holder 12 is provided with a lower through hole 121, and the upper die holder 11 is provided with an upper through hole 111 corresponding to the lower through hole 121. The two ends of the tube 50 are respectively clamped in the upper through hole 111 and the lower through hole 121. Alternatively, to facilitate assembly and disassembly of the tube 50, the lower die base 12 and the upper die base 11 are disposed in half, that is, the upper die base 11 is formed by two half upper bases in butt joint, and the lower die base 12 is also formed by two half lower bases in butt joint. The forming structure 20 comprises a forming template 23 with a forming cavity 231, a flexible medium 22 arranged in the tube 50 and a punch 21 for pushing the flexible medium 22, the forming template 23 is fixed between the upper die holder 11 and the lower die holder 12, the forming cavity 231 is in a through hole structure, namely the forming cavity is communicated with the upper through hole 111 and the lower through hole 121, the tube 50 penetrates through the forming cavity 231, the area 51 to be expanded is positioned in the forming cavity 231, the cross section of the forming cavity 231 is circular, and the inner diameter of the forming cavity 231 is larger than the outer diameter of the tube 50. The punch 21 pushes the flexible medium 22 downwards under the action of the stretcher, so that the flexible medium 22 drives the pipe wall of the to-be-expanded area 51 to fill the forming die cavity 231, and thus the expansion of the pipe 50 is realized. Alternatively, the flexible medium 22 is a powder medium, and the shape thereof may be changed arbitrarily, so that the region to be expanded 51 is expanded into the forming die 231.

The tube 50 is inserted into the forming cavity 231, the two ends of the tube 50 are respectively fixed to the upper through hole 111 and the lower through hole 121, and the flexible medium 22 is pushed downward by the stretcher, so that the flexible medium 22 extrudes the wall of the to-be-expanded area 51 into the forming cavity 231, and finally the tube 50 is expanded.

Referring to fig. 1 and 3, in one embodiment, the flexible medium 22 includes polymer powder. Alternatively, the polymer powder may be ethylene-vinyl acetate copolymer (EVA), Polyethylene (PE), polyvinyl chloride (PVC), Polytetrafluoroethylene (PTFE), and polyurethane (TPU), which are elastic solid particles having the characteristics of easy sealing and small particle size. Which has good die-attaching property when forming a complicated and small-sized pipe 50.

In one embodiment, the flexible medium 22 further comprises a lubricating powder mixed with a polymer powder. Alternatively, the lubricating powder is molybdenum disulfide powder, or the lubricating powder is graphite powder. Optionally, the ratio of lubricating powder to polymeric powder is 1: 9. Because the friction force between the polymer powder and the inner wall of the pipe 50 is too large, especially at the end of bulging processing, the polymer powder is compressed, which can cause the buckling failure of the pipe 50 in the area 51 to be bulged, and the bulging failure is caused. The lubrication condition of the polymer powder is improved by mixing the lubrication powder and the polymer powder, and the bulging quality of the pipe 50 is improved. The bulging device 100 of the embodiment also has the advantage of low mold cost, avoids the defects of insufficient mold adhesion and high sealing requirement existing in plasticine forming or hydraulic forming, and can be applied to bulging of small and medium-sized pipes 50.

Referring to fig. 1 and 3, in one embodiment, the forming structure 20 further includes an ultrasonic system for driving the punch 21 to vibrate, and the punch 21 melts the polymer powder into a viscous form during the vibration. Optionally, the ultrasonic system drives the punch 21 to vibrate at high frequency, so that the polymer powder vibrates relative to the inner wall of the pipe 50, the friction force between the polymer powder and the pipe 50 is reduced, and the forming limit and the forming quality are improved. Alternatively, the high molecular powder is instantaneously melted into a viscous state through high-frequency vibration of the punch 21 at the end of the bulging process, the time is 0.5s, the flexible medium 22 in the viscous state can drive the region 51 to be bulged to fully fill the forming die cavity 231, the bulging limit is improved, and the melting of the high molecular occurs at the end of the bulging process, so that the requirement of high sealing performance due to the adoption of the flexible medium 22 in the viscous state at normal temperature is avoided.

In one embodiment, the inner diameter of the tube 50 is larger than the outer diameter of the punch 21, i.e., there is a predetermined gap between the side surface of the punch 21 and the inner wall of the tube 50, thereby preventing the punch 21 from touching the inner wall of the tube 50 during vibration.

In one embodiment, the outer diameter of the tubing 50 is equal to the inner diameter of the lower through hole 121 and the outer diameter of the tubing 50 is equal to the inner diameter of the upper through hole 111, so that both ends of the tubing 50 are stable during the bulging process.

Referring to fig. 1 and 3, in an embodiment, the bulging apparatus 100 further includes a heating structure, the heating structure includes a heating base 61 having a fixing cavity and a heating tube 62 connected to the heating base 61 and generating heat in a conductive state, the lower die base 12, the upper die base 11 and the forming template 23 are all located in the fixing cavity, a heating hole communicated with the fixing cavity is further formed in a side wall of the heating base 61, and the heating tube 62 is disposed in the heating hole and one end of the heating tube abuts against the forming template 23. Optionally, the flexible medium 22 is graphite powder, and the forming template 23 is heated to 300-400 ℃ through the heating pipe 62, so that the temperature of the pipe 50 can be raised through heat transfer, the thermoplasticity of the pipe 50 is further improved, and the forming limit and the forming quality of the pipe 50 are improved. Optionally, the heating tube 62 is circumferentially provided in plural numbers so as to uniformly heat and warm up the tube 50.

In one embodiment, the bulging apparatus 100 further includes a guide block 30, the guide block 30 is stacked above the upper die base 11, a guide hole 31 is formed in a position of the guide block 30 corresponding to the upper through hole 111, and the punch 21 is inserted into the tube 50 through the guide hole 31. The guide hole 31 is used to guide the insertion of the punch 21 into the tube 50.

In one embodiment, the fixing structure 10 further comprises a bottom plate 13, and the heat generating base 61 and the lower die base 12 are fixed on the bottom plate 13.

The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed.

Claims

1. The utility model provides an expanding device for being hollow structure's tubular product carries out the bulging, wherein, tubular product is equipped with and remains bulging area, its characterized in that, expanding device includes:

2. The expanding apparatus of claim 1, wherein: the flexible medium includes a polymer powder.

3. The expanding apparatus of claim 2, wherein: the flexible media further includes a lubricating powder mixed with the polymeric powder.

4. The expanding apparatus of claim 3, wherein: the lubricating powder is molybdenum disulfide powder, or the lubricating powder is graphite powder.

5. The expanding apparatus of claim 2, wherein: the forming structure further comprises an ultrasonic system for driving the punch to vibrate, and the punch fuses the polymer powder into a sticky body during vibration.

6. The expanding apparatus of claim 5, wherein: the inner diameter of the pipe is larger than the outer diameter of the punch.

7. The expanding apparatus of claim 1, wherein: the outer diameter of the pipe is equal to the inner diameter of the lower through hole, and the outer diameter of the pipe is equal to the inner diameter of the upper through hole.

8. The expanding apparatus of claim 2, wherein: the bulging device still includes heating structure, heating structure is including the heating seat that has fixed chamber and connection the heating tube of heating seat, the die holder the upper die base and the shaping template all is located fixed chamber, the intercommunication has still been seted up to the lateral wall of heating seat the heating hole in fixed chamber, the heating tube set up in heating hole and one end butt the shaping template.

9. The expanding device of any one of claims 1 to 7, wherein: the bulging device further comprises a guide block, the guide block is arranged above the upper die base in a stacked mode, a guide hole is formed in the position, corresponding to the upper through hole, of the guide block, and the punch is inserted into the pipe through the guide hole.

10. The expanding device of any one of claims 1 to 7, wherein: the fixing structure further comprises a bottom plate, and the lower die holder is fixed on the bottom plate.