KR20170048823A - Hydroforming apparatus for tube - Google Patents

Hydroforming apparatus for tube Download PDF

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Publication number
KR20170048823A
KR20170048823A KR1020150149389A KR20150149389A KR20170048823A KR 20170048823 A KR20170048823 A KR 20170048823A KR 1020150149389 A KR1020150149389 A KR 1020150149389A KR 20150149389 A KR20150149389 A KR 20150149389A KR 20170048823 A KR20170048823 A KR 20170048823A
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KR
South Korea
Prior art keywords
tube
pipe
molding plate
mold
upper mold
Prior art date
Application number
KR1020150149389A
Other languages
Korean (ko)
Other versions
KR101744799B1 (en
Inventor
이병호
임창준
강대건
이호진
유영훈
Original Assignee
세종공업 주식회사
(주)탈리스
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Priority to KR1020150149389A priority Critical patent/KR101744799B1/en
Publication of KR20170048823A publication Critical patent/KR20170048823A/en
Application granted granted Critical
Publication of KR101744799B1 publication Critical patent/KR101744799B1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D7/00—Bending rods, profiles, or tubes
    • B21D7/06—Bending rods, profiles, or tubes in press brakes or between rams and anvils or abutments; Pliers with forming dies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/02—Stamping using rigid devices or tools
    • B21D22/04—Stamping using rigid devices or tools for dimpling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D7/00—Bending rods, profiles, or tubes
    • B21D7/16—Auxiliary equipment, e.g. for heating or cooling of bends

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Abstract

According to the present invention, an apparatus for hydroforming a pipe comprises: a lower and an upper mold vertically stacked on top of each other to arrange a pipe to be formed therebetween to bend the pipe; a lower forming plate mounted on a surface of the lower mold coming in contact with the pipe; an upper forming plate mounted on a surface of the upper mold coming in contact with the pipe; a pair of punches to seal both longitudinal ends of the pipe; and a pair of feeding cylinders to transport the punches. One or more uneven units are formed on an upper surface of the lower forming plate and a lower surface of the upper forming plate to allow the lower and the upper forming plate to form a pattern matching the uneven units on a surface of the pipe when the lower mold and the upper mold bend the pipe. According to the apparatus for hydroforming the pipe, the pipe is bent while the pipe is filled with high pressure compression water to prevent wrinkles on a bending portion. Bending and surface processing of the pipe are simultaneously performed to improve productivity and reduce a defect rate. Various types of pipes can be hydroformed by replacing and mounting the lower and the upper forming plate.

Description

[0001] The present invention relates to a hydroforming apparatus for tube,

The present invention relates to a hydraulic pressure molding apparatus for plastic-working a pipe material in a state in which high-pressure compressed water is injected into a pipe material, and more particularly, to a hydraulic pressure molding apparatus capable of simultaneously bending and surface- To a molding apparatus.

In the modern industry, in which the industry is continuously developing, product cycles are getting shorter due to diversification of consumers' purchasing preferences and the trend of smaller and larger variety of industrial structure. In order to cope with this, the industrial field has been steadily pursuing automation of the process.

On the other hand, it should be noted that the automation process must consider and reflect factors such as the speedy work process, process precision and product quality improvement. In recent years, due to the increase in income of such consumers and the development of various products, the industrial customs are also increasing and becoming larger.

Further, in order to secure the supply amount in accordance with the demand amount of the pipe as described above, it is necessary to shorten the time required for the manufacturing process, and in order to do so, automation of the related process is essential. Until recently, however, the milling work has mostly been done by hand.

Generally, the tube is manufactured by welding a metal sheet of a predetermined thickness by welding at the end, and may be used in a straight shape or in a curved shape by bending or curving the stop at a certain curvature. At this time, when bending the tube by simple pressing, wrinkles are generated or collapsed at the bending portion, and when the tube has a small curvature, the bending angle is not accurate and the bending surface is not smooth.

In order to solve such a problem, a hydroforming apparatus has been proposed in which the tube is bended while a high-pressure compressed water is filled in the tube. However, since the conventional hydroforming apparatus merely performs a function of bending the tube only, it can not form a concave or convex pattern in the tube, and therefore, a separate plastic working step for machining the tube surface is additionally required. It is difficult to precisely select the pattern forming position, which leads to a disadvantage that the product defects are increased.

KR 10-2011-0138705 A

SUMMARY OF THE INVENTION The present invention has been proposed in order to solve the above problems and it is an object of the present invention to prevent bending of the bending portion by bending the bending portion in a state where the high pressure water is filled in the bending portion, The present invention has been made in view of the above problems, and it is an object of the present invention to provide a tubular hydraulic pressure molding apparatus capable of improving productivity and reducing a defective rate.

According to another aspect of the present invention, there is provided a hydraulic pressure molding apparatus comprising: a lower mold and an upper mold which are vertically stacked with a workpiece being interposed therebetween to bend the workpiece; A lower molding plate mounted on a surface of the lower mold to be in contact with the tube; An upper mold plate mounted on a surface of the upper mold that is in contact with the tube; A pair of punches for sealing both longitudinal ends of the pipe material; And a pair of feeding cylinders for transferring the pair of punches, wherein at least one concave / convex portion is formed on an upper surface of the lower molding plate and a lower surface of the upper molding plate, respectively, The lower molding plate and the upper molding plate form a pattern to be formed on the surface of the pipe member with the concave-convex portion.

The lower molding plate and the upper molding plate are each formed into a semicylindrical shape having a semicircular cross section so as to cover the entire one outer side of the tube,

When the width direction ends of the lower molding plate and the upper molding plate come into contact with each other, the lower molding plate and the upper molding plate form a single pipe shape bent or curved.

The lower molding plate and the upper molding plate are made of a material having higher strength than the lower mold and the upper mold.

The upper mold is lowered to bend the tube while the tube is placed on the lower mold, and the pair of feeding cylinders are moved in a direction in which the upper mold is in contact with the tube, Is moved toward the tube.

The lower mold and the upper mold are configured to bend down the interruption of the pipe to a U shape, and the descending speed of the upper mold and the moving speed of the punch are set to be the same.

The pair of punches are respectively in close contact with both longitudinal ends of the tube, and a part of the ends are inserted into the tube in a fitting manner.

The maximum outer diameter of the punch is formed to be equal to the outer diameter of the pipe.

By using the apparatus for hydroforming hydraulic pressure according to the present invention, it is possible to prevent the occurrence of wrinkles in the bending portion by bending the pipe material in a state in which the high-pressure compressed water is filled in the pipe, and the bending and surface processing As a result, the productivity and the defect rate can be improved, and it is possible to perform various types of pipes by hydroforming by replacing only the lower molding plate and the upper molding plate.

1 is a side view of a tubular hydroforming apparatus according to the present invention.
2 is an exploded perspective view of a lower molding plate and an upper molding plate included in the tubular hydroforming apparatus according to the present invention.
Figs. 3 to 5 sequentially illustrate the process of forming the tube by using the tube hydroforming apparatus according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a hydraulic hydroforming apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a side view of a tubular hydraulic pressure molding apparatus according to the present invention, and FIG. 2 is an exploded perspective view of a lower molding plate and an upper molding plate included in the tubular fluid pressure molding apparatus according to the present invention.

The apparatus for hydroforming a pipe according to the present invention is a type of a plastic working apparatus for bending a pipe 10 so that the diameter of each part of the pipe 10 can be increased without causing a phenomenon of forming a wrinkle on the bending portion of the pipe 10 And bending the tube 10 in a state in which high-pressure compressed water is injected into the tube 10 so that the tube 10 can be kept constant.

At this time, the tubular hydroforming apparatus according to the present invention is most distinguished in that it is configured so as to be able to perform both the bending process of the tube 10 and the surface machining. That is, the apparatus for hydroforming a pipe according to the present invention comprises a lower mold 110 and an upper mold 120 which are stacked vertically with a pipe 10 to be machined therebetween to bend the pipe 10, An upper mold 120 plate mounted on a surface of the upper mold 120 which is in contact with the tube 10 and a lower mold 120 installed on a surface of the upper mold 120 to be in contact with the tube 10, A pair of punches 310 for sealing both longitudinal ends of the tube 10 and a pair of feeding cylinders 320 for transferring the pair of punches 310. At this time, at least one recessed portion 240 is formed on the upper surface of the lower molding plate 210 and the lower surface of the upper molding plate 220, respectively.

Therefore, when the lower mold 110 and the upper mold 120 press the tube 10 to bend the tube 10, the lower molding plate 210 mounted on the upper surface of the lower mold 110, The upper molding plate 220 mounted on the lower surface of the upper mold 120 is pressed onto the surface of the tube 10 so that the tube 10 is bent in the bending structure of the lower molding plate 210 and the upper molding plate 220 A pattern is formed on the surface of the concave-convex portion 240 to be formed.

That is, by using the apparatus for hydroforming according to the present invention, the bending of the tube 10 can be performed by one operation of lowering the upper mold 120 while the tube 10 is placed on the lower mold 110 And surface processing are performed all at once, which is advantageous in that the productivity is remarkably improved.

When the surface of the tube 10 is bent by the plastic forming method, a separate mold having the concave-convex portion should be pressed against the outer surface of the tube 10. The same lower and upper molds 110, Even if the bending of the tube 10 is performed by bending the tube 10 with a predetermined angle, the bending angle of the tube 10 having the bending process may be finely distorted, This becomes very difficult. If the metal mold having the concavities and convexities is not brought into close contact with the outer surface of the tube 10 accurately, the surface can not be precisely machined, thereby increasing the defective rate.

However, in the tubular hydroforming apparatus according to the present invention, the entire lower mold plate 210 and the upper mold plate 220 are in close contact with the outer surface of the tube 10 in the process of bending the tube 10, 10 has an advantage that a pattern corresponding to the concave and convex portions 240 is formed at a precise position, that is, a defect rate is hardly generated.

When the pattern to be formed on the surface of the tube 10 is located only on the upper surface and the lower surface of the tube 10, the lower and upper plates 210 and 220 are disposed only on the upper and lower surfaces of the tube 10, Can be configured to be in close contact with each other. When the lower molding plate 210 and the upper molding plate 220 are in close contact with only the upper and lower surfaces of the tube 10, The untouched surface bulges and the overall shape of the tube 10 can be abnormally deformed.

Therefore, it is preferable that the lower molding plate 210 and the upper molding plate 220 are formed in a semi-cylindrical shape having a shape capable of covering the entire outer surface of one tube 10, that is, each having a semicircular cross section. When the lower molding plate 210 and the upper molding plate 220 are each formed into a semi-cylindrical shape, when the width direction ends of the lower molding plate 210 and the upper molding plate 220 are bent, The tubular member 10 to be fluid-pressure-molded between the lower molding plate 210 and the upper molding plate 220 can be maintained in a circular shape even if it is bent or curved.

In order to press the tube 10 to bend it and to form a pattern of protrusions 240 on the surface of the tube 10, a component for pressing the tube 10 is made of a material having a higher strength than the tube 10 . When the lower mold 110, the upper mold 120, the lower molding plate 210, and the upper molding plate 220 are both made of a high-strength material, since the material having high strength is generally expensive, The total manufacturing cost of the molding apparatus becomes very high.

Therefore, it is preferable that only the lower molding plate 210 and the upper molding plate 220, which are in direct contact with the tube 10, are manufactured from a high strength material. That is, the lower molding plate 210 and the upper molding plate 220 are preferably made of a material having a higher strength than the lower mold 110 and the upper mold 120.

If only the lower molding plate 210 and the upper molding plate 220 are made of a high strength material and the lower mold 110 and the upper mold 120 are made of a material having a relatively low strength, Since the pipe 10 can be fluid-pressure-formed, the manufacturing cost of the pipe hydraulic pressure molding apparatus can be remarkably reduced.

The lower molding die 210 and the upper molding die 220, which are directly pressed to the tube 10, and the lower molding die 210, When the type of the tube 10 to be manufactured is changed, only the lower molding plate 210 and the upper molding plate 220 are replaced and the remaining components, that is, the lower mold 110, The upper mold 120, the punch 310, and the feeding cylinder 320 can all be used in common, which is advantageous in that the utilization is very high.

When the tubular hydroforming is repeated several times, the portions contacting the tubular member 10 are worn. In the tubular hydroforming apparatus according to the present invention, the lower molding plate 210 and the upper molding plate 220 are replaced It is expected that the maintenance cost can be remarkably reduced.

3 to 5 sequentially illustrate the process of forming the tube 10 by using the tube hydroforming apparatus according to the present invention.

When the pipe 10 is to be formed by using the pipe tapping apparatus according to the present invention, the pipe 10 is first placed on the lower mold 110 as shown in FIG. At this time, the lower molding plate 210 is mounted on the upper surface of the lower mold 110, and the tube 10 is in contact with the lower molding plate 210.

4, the punch 310 is inserted into the tube 10 as shown in FIG. 4, so that the tube 10 is inserted into the tube 10, (10). At this time, the pair of punches 310 are in close contact with both longitudinal ends of the tube 10 so that the compressed water in the tube 10 can not flow out to the outside, and are in close contact with both ends in the longitudinal direction of the tube 10 A part of the end of the punch 310 is inserted into the inside of the tube 10 in a fitting manner so that the pressure of the compressed water in the tube 10 can be further increased. When a part of the end of the punch 310 is press-fitted into the pipe 10 as described above, not only the pressure of the compressed water inside the pipe 10 is increased but also the sealing property of both ends of the pipe 10 in the longitudinal direction is improved Effect can also be obtained.

The upper mold 120 is lowered to bend the tube 10 in accordance with the shapes of the lower mold 110 and the upper mold 120. [ 5, the lower mold 110, the upper mold 120, the lower molding plate 210, and the upper molding plate 220 are vertically cut to clearly show the bending shape of the tube 10, The lower molding plate 210 and the upper molding plate 220 are respectively formed in a semi-cylindrical shape as shown in FIG. 2, so that the lower molding plate 210 and the upper molding plate 220 are pressed to cover the entire outer surface of the tube 10.

When the lower mold 110 is lifted and the upper mold 120 is lowered when the tube 10 is bent, when the lower mold 110 and the upper mold 120 are lifted and lowered, It is disadvantageous in that the precision of machining is lowered and the driving parts for lifting and lowering the lower mold 110 and the upper mold 120 are separately provided. Therefore, it is preferable that the lower mold 110 is fixed and only the upper mold 120 is raised and lowered.

On the other hand, when the end of the tube 10 is bent while the both ends of the tube 10 are fixed, the total length of the tube 10 is increased, and the diameter of the tube 10 is reduced. As the diameter of the tube 10 is reduced, the surface of the tube 10 is not brought into close contact with the lower molding plate 210 and the upper molding plate 220, so that the surface of the tube 10 is not normally processed .

Therefore, in order to prevent the phenomenon that the entire length of the tube 10 is increased and the diameter of the tube 10 is reduced, even if the tube 10 is bent, It is preferred that the feeding cylinder 320 is configured to gradually push both ends of the tube 10 into place. That is, after the upper forming plate 220 contacts the tube 10, the pair of feeding cylinders 320 are moved in a direction corresponding to the lowering speed of the upper mold 120, (10). ≪ / RTI >

When the punch 310 supporting both longitudinal ends of the pipe 10 is moved in the direction of compressing the pipe 10 during the bending process of the pipe 10, the reduction of the diameter of the pipe 10 is prevented, The surface of the tube 10 can be pressed onto the lower molding plate 210 and the upper molding plate 220 so that the surface of the tube 10 can be normally processed.

If the maximum outer diameter of the punch 310 is set larger than the outer diameter of the tube 10, the punch 310 can not be smoothly transferred horizontally between the lower mold 110 and the upper mold 120, It is preferable that the maximum outer diameter of the tubular member 310 is set equal to the outer diameter of the tubular member 10.

When the upper mold 120 and the upper mold 120 are constructed to be bent downward in a U shape as shown in the present embodiment, The length of the tube 10 is increased by 20 cm when both ends in the longitudinal direction of the tube 10 are fixed when the tube 10 is lowered by 10 cm in a state of being in contact with the pair of feeding cylinders 10, It is preferable that each of the lengthwise ends of the tube 10 is pressed by 10 cm each. That is, the descending speed of the upper mold 120 and the moving speed of the punch 310 are preferably set to be the same.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the scope of the present invention is not limited to the disclosed exemplary embodiments. It will also be appreciated that many modifications and variations will be apparent to those skilled in the art without departing from the scope of the invention.

10: pipe member 110: lower mold
120: upper mold 210: lower molding plate
220: upper molding plate 240: concave and convex portion
310: Punch 320: Feeding cylinder

Claims (7)

A lower mold and an upper mold which are vertically stacked with a workpiece to be machined therebetween to bend the workpiece;
A lower molding plate mounted on a surface of the lower mold to be in contact with the tube;
An upper mold plate mounted on a surface of the upper mold that is in contact with the tube;
A pair of punches for sealing both longitudinal ends of the pipe material; And
A pair of feeding cylinders for feeding the pair of punches;
, ≪ / RTI &
At least one recessed portion is formed on the upper surface of the lower molding plate and the lower surface of the upper molding plate so that when the lower mold and the upper mold bend the tube, the lower molding plate and the upper molding plate, Wherein the pattern forming step forms a pattern to be combined with the part. The method according to claim 1,
The lower molding plate and the upper molding plate are each formed into a semicylindrical shape having a semicircular cross section so as to cover the entire one outer side of the tube,
Wherein when the width direction ends of the lower molding plate and the upper molding plate are in contact with each other, the lower molding plate and the upper molding plate form a single pipe shape bent or curved. The method according to claim 1,
Wherein the lower molding plate and the upper molding plate are made of a material having a higher strength than the lower mold and the upper mold. The method according to claim 1,
The upper mold is lowered to bend the tube when the tube is placed on the lower mold,
Wherein the pair of feeding cylinders move the punch toward the pipe material in accordance with a descending speed of the upper mold after the upper forming plate contacts the pipe material. The method of claim 4,
The lower mold and the upper mold are configured to down-bend the interruption of the tubing in a " U " shape,
Wherein the lowering speed of the upper mold and the moving speed of the punch are the same. The method according to claim 1,
Wherein the pair of punches are respectively in close contact with both longitudinal ends of the pipe, and a part of the end is inserted into the pipe in a fitting manner. The method of claim 6,
Wherein a maximum outer diameter of the punch is equal to an outer diameter of the pipe.
KR1020150149389A 2015-10-27 2015-10-27 Hydroforming apparatus for tube KR101744799B1 (en)

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Application Number Priority Date Filing Date Title
KR1020150149389A KR101744799B1 (en) 2015-10-27 2015-10-27 Hydroforming apparatus for tube

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KR20170048823A true KR20170048823A (en) 2017-05-10
KR101744799B1 KR101744799B1 (en) 2017-06-09

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20140088927A (en) * 2012-12-14 2014-07-14 엘지전자 주식회사 Mobile terminal
CN111151611A (en) * 2019-12-28 2020-05-15 张家保 Arc bending device of aluminum profile
CN113732155A (en) * 2021-09-08 2021-12-03 南京航威智造科技有限公司 Method for machining large-caliber ultrathin-wall bent pipe
CN114160666A (en) * 2021-11-10 2022-03-11 湖州金螺智能科技有限公司 Thin-wall stainless steel clamping and pressing pipe fitting forming device

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004141904A (en) * 2002-10-23 2004-05-20 Aisin Takaoka Ltd Method and device of forming with hydraulic press

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20140088927A (en) * 2012-12-14 2014-07-14 엘지전자 주식회사 Mobile terminal
CN111151611A (en) * 2019-12-28 2020-05-15 张家保 Arc bending device of aluminum profile
CN113732155A (en) * 2021-09-08 2021-12-03 南京航威智造科技有限公司 Method for machining large-caliber ultrathin-wall bent pipe
CN114160666A (en) * 2021-11-10 2022-03-11 湖州金螺智能科技有限公司 Thin-wall stainless steel clamping and pressing pipe fitting forming device

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