WO2018092966A1

WO2018092966A1 - Apparatus and method for manufacturing pipe having variable cross-section

Info

Publication number: WO2018092966A1
Application number: PCT/KR2016/013937
Authority: WO
Inventors: 장동석; 박종배; 김성민
Original assignee: 동연스틸주식회사
Priority date: 2016-11-18
Filing date: 2016-11-30
Publication date: 2018-05-24
Also published as: KR101942242B1; KR20180056481A

Abstract

The present invention relates to an apparatus for manufacturing a pipe having a variable cross-section and a method for manufacturing a pipe having a variable cross-section using same, the apparatus comprising: a first moving device and a second moving device each having a respective pressurizing space formed therebetween; a plurality of support wedges arranged along the circumferential direction on the inner circumferential surfaces of the pressurizing spaces; a plurality of pressurizing wedges each coupling to the respective inner circumferential surfaces of the plurality of support wedges so as to form, between each pressurizing wedge and support wedge, a draw-out space where a pipe member is inserted into and drawn out from; a draw-out mold having the diameter of the draw-out space adjusted by having the respective intervals arranged between the plurality of support wedges and the plurality of pressurizing wedges adjusted by means of pressurization by the first moving device and the second moving device; and a mandrel for supporting the inner circumferential surface of the pipe member inserted in the draw-out space.

Description

Pipe manufacturing apparatus and method with variable cross section

The present invention relates to an apparatus and method for manufacturing a pipe having a variable cross section that can be used for various industrial parts.

In general, drawing is a method of metal processing in which a material is pushed into a mold and the balance of the bending process grabs and pulls the material, thereby making the cross-sectional area smaller and longer than the material.

That is, since the hole of the drawing die has a constant cross-sectional shape, the product to be produced is also molded into a constant cross-sectional shape toward the longitudinal direction.

However, in the case of the product manufactured through the above-mentioned drawing process, since it is formed long with only a constant cross-sectional shape in the longitudinal direction of the product there is a difficulty in producing a product that requires bending or variable cross-sectional shape of the product.

Particularly, even though the stress distribution varies depending on the product, the same thickness is formed throughout the product, resulting in more size and strength than necessary in a part of the product, which is uneconomical and prevents the product from being lightweight and simplified in structure.

The conventional method of manufacturing a tube having a change in cross section requires two tubes having different diameters or thicknesses, and also requires a process of overlapping each other or first-order processing in order to join two different tubes. Due to this, labor waste, unit cost rise, production time is excessive, as well as uniform welding is difficult, many defects occur, and there is a problem that the performance of the product is also degraded due to the change of physical properties due to the heat of welding.

The present invention has been made to solve the above problems, the object of the present invention is that the welding work or post-treatment processing is unnecessary, it is easy to process the product and can reduce the production time, production cost and manufacturing cost of the product To provide a pipe manufacturing apparatus and method having a variable cross section.

Pipe manufacturing apparatus having a variable cross-section according to the present invention includes a first moving device and a second moving device, the pressing space is formed between each of the plurality of support wedges are arranged in the circumferential direction on the inner peripheral surface of the pressing space, A plurality of pressure wedges respectively coupled to inner circumferential surfaces of the plurality of support wedges to form a drawing space in which pipe members are inserted and drawn between the plurality of support wedges and the plurality of pressure wedges by pressing the first and second moving devices. It characterized in that it comprises a drawing mold and the mandrel for supporting the inner circumferential surface of the pipe member inserted into the drawing space by adjusting the arrangement interval of the support wedge and the plurality of pressure wedge is adjusted the diameter of the drawing space.

In addition, the drawing mold has a plurality of support springs respectively installed between the plurality of support wedges, the plurality of support wedges and a plurality of pressure wedges to prevent the separation of the plurality of support wedges and a plurality of pressure wedges The cover further comprises a plurality of support covers coupled to the upper mold and the lower mold.

In addition, the mandrel is characterized in that it further comprises a disk formed of a multi-stage structure, and a bar connected to one end of the disk.

Pipe manufacturing method having a variable cross-section according to the present invention is a plurality of supports radially installed on the inner peripheral surface of the pressurized space located between the first moving device and the second moving device by the pressure of the first moving device and the second moving device. The first step of adjusting the diameter of the drawn space formed on the inner side of the plurality of pressure wedges by adjusting the arrangement interval of the wedge and the plurality of pressure wedges respectively coupled to the inner circumferential surface of the plurality of support wedges, And a second step of mounting the member, a third step of inserting a mandrel into the inside of the pipe member, and a fourth step of drawing a variable cross section on the pipe member by drawing the pipe member.

Accordingly, the pipe manufacturing apparatus and method having a variable cross section according to the present invention is drawn in a state in which the tubular member is radially pressurized by a plurality of pressure wedges, there is no need for welding work or post-treatment process, the product processing operation is easy And there is an advantage that can reduce the production time, production cost and manufacturing cost of the product.

1 is a schematic view showing a pipe manufacturing apparatus having a variable cross section according to the present invention.

Figure 2 is a cross-sectional view showing a state in which the tube member is inserted and drawn in the pipe manufacturing apparatus having a variable cross-section according to the present invention.

Figure 3 is a schematic view showing a state in which the support cover is further installed in the pipe manufacturing apparatus having a variable cross-section according to the present invention.

1000: pipe manufacturing apparatus having a variable cross section according to the present invention

10: pipe member

110: first moving device

115: drawing space

120: second moving device

200: drawing mold

210: support wedge

220: pressure wedge

230: support spring

240: support cover

300: mandrel

310: disk

320: Bar

Hereinafter, the technical spirit of the present invention will be described in more detail with reference to the accompanying drawings.

The accompanying drawings are only examples to illustrate the technical idea of the present invention in more detail, and thus the technical idea of the present invention is not limited to the forms of the accompanying drawings.

1 is a schematic view showing a pipe manufacturing apparatus having a variable cross section according to the present invention, Figure 2 is a cross-sectional view showing a state in which the pipe member is inserted and drawn in the pipe manufacturing apparatus having a variable cross section according to the present invention.

Referring to FIG. 1, the pipe manufacturing apparatus 1000 having a variable cross section according to the present invention includes a first moving device 110, a second moving device 120, a drawing mold 200, and a mandrel 300. .

The first moving device 110 and the second moving device 120 are conventional pressurization devices, and the second moving device 120 is installed below the first moving device 110.

In addition, a pressurized space is formed between the first moving device 110 and the second moving device 120. The pressurized space may be formed in a polyhedral structure, but FIG. 1 illustrates an example in which the pressurized space is formed in a circular shape, but the present invention is not limited thereto.

The drawing mold 200 is a tube member 10 is inserted and drawn, and includes a support wedge 210, pressure wedge 220.

The support wedge 210 is arranged along the circumferential direction on the inner circumferential surface of the pressing space.

The pressure wedge 220 is coupled to each of the inner circumferential surfaces of the plurality of support wedges 210 to form a drawing space 115 into which the tubular member 10 is inserted and drawn between each other.

On the other hand, the drawing mold 200 is controlled by the arrangement of the plurality of support wedges 210 and the plurality of pressure wedges 220 by the pressure of the first mobile device 110 and the second mobile device 120 is adjusted. The diameter of the drawing space 115 is adjusted.

Referring to FIG. 2, the mandrel 300 is inserted into the tube member 10 to support an inner circumferential surface of the tube member 10 inserted into the drawing space 115.

Accordingly, the pipe manufacturing apparatus 1000 having a variable cross section according to the present invention is drawn in a state in which the tubular member 10 is radially pressurized by a plurality of pressure wedges 220, thereby eliminating the need for welding or post-treatment. Thus, there is an advantage that the product processing operation is easy and the production time, production cost and manufacturing cost of the product can be reduced.

Figure 3 is a schematic diagram showing a state in which the support cover is further installed in the pipe manufacturing apparatus having a variable cross section according to the present invention.

Referring to FIG. 3, the drawing mold 200 may further include a plurality of support springs 230 and a plurality of support covers 240.

The plurality of support springs 230 are installed between the plurality of support wedges 210, respectively, and serve to elastically open the plurality of support ways.

The plurality of support covers 240 cover both sides of the plurality of support wedges 210 and the plurality of pressure wedges 220 to prevent the plurality of support wedges 210 and the pressure wedges 220 from being separated. And it is coupled to the first transfer device 110 and the second transfer device 120.

Referring back to FIG. 2, the mandrel 300 may further include a disk 310 and a bar 320.

The disk 310 is formed in a multi-stage structure in which a plurality of tubes having different diameters are connected to each other. Referring to FIG. 2, the disk 310 may be formed to have a shorter diameter as the disk 310 is disposed farther from the bar 320, but the present invention is not limited thereto.

The bar 330 may be connected to one end of the disk 310 and may be inserted into the pipe member 10 by an actuator (not shown).

Accordingly, the mandrel 300 is formed by the disk 310 having a multi-stage structure, and thus the portion corresponding to the diameter of the pipe member 10 inserted into the drawing space 115 in the disk 310 is drawn out. There is an advantage that can be provided quickly into the interior of the tube member 10 inserted into the space 115.

1 to 3, a pipe manufacturing method having a variable cross section according to the present invention will be described.

The first step is radially formed on the inner circumferential surface of the pressurized space located between the first mobile device 110 and the second mobile device 120 by the pressure of the first mobile device 110 and the second mobile device 120. Arranged intervals of the plurality of support wedges 210 and the plurality of pressure wedges 220 respectively coupled to the inner circumferential surfaces of the plurality of support wedges 210 are adjusted to be formed between the plurality of pressure wedges 220. The diameter of the drawing space 115 is adjusted.

In the second step, the tubular member 10 is mounted on the drawing space 115.

In a third step, the mandrel 300 is inserted into the pipe member 10.

In the fourth step, the tube member 10 is drawn to form a variable cross section on the tube member 10.

Meanwhile, the drawing mold 200 may further include a plurality of support springs 230 and a plurality of support covers 240.

The plurality of support springs 230 are installed between the plurality of support wedges 210, respectively, and serve to elastically open the plurality of support ways. Accordingly, in the first step, an arrangement interval of the plurality of support wedges 210 and the plurality of pressure wedges 220 is adjusted by the pressure of the first mobile device 110 and the second mobile device 120. Afterwards, when the pressurization of the first moving device 110 and the second moving device 120 is stopped, an arrangement interval between the plurality of support wedges 210 and the plurality of pressure wedges 220 is also supported by the support spring 230. By the elasticity of the first moving device 110 and the second moving device 120 is easily returned to the pre-press arrangement interval.

Accordingly, in the fourth step, the disk 310 is formed in a multi-stage structure, whereby the portion corresponding to the diameter of the pipe member 10 inserted into the drawing space 115 in the disk 310 is drawn out. There is an advantage that can be provided quickly into the interior of the tube member 10 inserted in (115).

The present invention is not limited to the above-described embodiments, and the scope of application is not limited, and various modifications can be made without departing from the gist of the present invention as claimed in the claims.

Claims

A first moving device and a second moving device each having a pressurized space formed therebetween;

A plurality of support wedges arranged in the circumferential direction on the inner circumferential surface of the pressing space, and a plurality of pressure wedges respectively coupled to the inner circumferential surfaces of the plurality of support wedges to form a drawing space in which pipe members are inserted and drawn between them. And a drawing mold in which an arrangement interval of the plurality of support wedges and the plurality of pressure wedges is adjusted by the pressure of the first moving device and the second moving device to adjust the diameter of the drawing space. And

And a mandrel for supporting an inner circumferential surface of the pipe member inserted into the drawing space.
The method of claim 1, wherein the drawing mold

The upper mold and the plurality of support springs respectively installed between the plurality of support wedges, covering both sides of the plurality of support wedges and the plurality of pressure wedges to prevent separation of the plurality of support wedges and the pressure wedges. Pipe manufacturing apparatus having a variable cross-section characterized in that it further comprises a plurality of support covers coupled to the lower mold.
The method of claim 1, wherein the mandrel

And a disk having a multi-stage structure, and a bar connected to one end of the disk.
A plurality of support wedges radially installed on an inner circumferential surface of the pressurizing space located between the first and second moving devices by pressurization of the first and second moving devices, and on the inner circumferential surfaces of the plurality of support wedges, respectively. A first step of adjusting a diameter of a drawing space formed inside the plurality of pressure wedges by adjusting an arrangement interval of the plurality of pressure wedges coupled;

A second step of placing a tube member in the drawing space;

Inserting a mandrel into the tube member; And

And a fourth step of drawing the pipe member to form a variable cross section on the pipe member.
The method of claim 4, wherein the drawing mold

The upper mold and the plurality of support springs respectively installed between the plurality of support wedges, covering both sides of the plurality of support wedges and the plurality of pressure wedges to prevent separation of the plurality of support wedges and the pressure wedges. Pipe manufacturing method having a variable cross-section characterized in that it further comprises a plurality of support covers coupled to the lower mold.
The method of claim 4, wherein the mandrel

And a disk having a multi-stage structure, and a bar connected to one end of the disk.