KR20020034736A - Hydroforming method using bellows forming actuator - Google Patents

Hydroforming method using bellows forming actuator Download PDF

Info

Publication number
KR20020034736A
KR20020034736A KR1020000065236A KR20000065236A KR20020034736A KR 20020034736 A KR20020034736 A KR 20020034736A KR 1020000065236 A KR1020000065236 A KR 1020000065236A KR 20000065236 A KR20000065236 A KR 20000065236A KR 20020034736 A KR20020034736 A KR 20020034736A
Authority
KR
South Korea
Prior art keywords
bellows
tube
forming actuator
hydroforming method
actuator
Prior art date
Application number
KR1020000065236A
Other languages
Korean (ko)
Other versions
KR100379955B1 (en
Inventor
권희상
Original Assignee
이계안
현대자동차주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 이계안, 현대자동차주식회사 filed Critical 이계안
Priority to KR10-2000-0065236A priority Critical patent/KR100379955B1/en
Publication of KR20020034736A publication Critical patent/KR20020034736A/en
Application granted granted Critical
Publication of KR100379955B1 publication Critical patent/KR100379955B1/en

Links

Classifications

    • 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
    • B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
    • B21D26/033—Deforming tubular bodies
    • B21D26/035—Deforming tubular bodies including an additional treatment performed by fluid pressure, e.g. perforating
    • 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
    • B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
    • B21D26/033—Deforming tubular bodies
    • B21D26/045—Closing or sealing means

Landscapes

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

Abstract

PURPOSE: A hydroforming method using a bellows forming actuator is provided which prevents corrosion inside the tube and removes pressure loss by inserting a bellows shaped forming actuator into a tube and forming the tube by a pressure of liquid supplied through a cylinder. CONSTITUTION: The hydroforming method using the bellows forming actuator comprises a bellows case(32) which is inserted into the inner side of a tube(40); a bellows(34) which is built in the bellows case(32) in a folded state, and which is expanded from the inner side of the tube(40) when a hydraulic pressure inside the bellows(34) is increased; and torsion springs(36) which are fixed to one side of the bellows(34) so that the bellows(34) expanded when a hydraulic pressure inside the bellows(34) is decreased is folded again; and a bellows forming actuator(30), wherein the tube(40) is formed by supplying liquid into the bellows(34) through a cylinder(20) after mounting the bellows forming actuator(30) on the end part of the tube(40) to be formed that is mounted between dies(10) so that the bellows case(32) is inserted into the bellows forming actuator(30).

Description

벨로우즈 포밍 액튜에이터를 이용한 하이드로포밍법{Hydroforming method using bellows forming actuator}Hydroforming method using bellows forming actuator

본 발명은 벨로우즈 포밍 액튜에이터에 관한 것으로서, 더욱 상세하게는 벨로우즈 형상의 포밍 액튜에이터를 튜브 내에 삽입하고, 실린더를 통해 공급되는 액체의 압력으로 튜브를 성형시킴으로써, 튜브 내부의 부식을 방지하고, 압력손실을 없애며, 시일링 상태의 개선으로 물의 누수를 방지할 수 있는 벨로우즈 포밍 액튜에이터를 이용한 하이드로포밍법에 관한 것이다.The present invention relates to a bellows forming actuator, and more particularly, by inserting a bellows-shaped forming actuator into a tube and shaping the tube with the pressure of the liquid supplied through the cylinder, thereby preventing corrosion in the tube and reducing pressure loss. The present invention relates to a hydroforming method using a bellows forming actuator capable of removing water and preventing water leakage by improving the sealing state.

또한, 벨로우즈 내부의 액압감소시 팽창된 벨로우즈가 자동으로 접혀질 수 있도록 함으로써, 상기 튜브를 금형에 용이하게 장착하거나 제거할 수 있도록 한 벨로우즈 포밍 액튜에이터를 이용한 하이드로포밍법에 관한 것이다.In addition, the present invention relates to a hydroforming method using a bellows forming actuator that allows the expanded bellows to be automatically folded when the hydraulic pressure inside the bellows is reduced, thereby allowing the tube to be easily mounted or removed from the mold.

일반적으로 하이드로포밍법은 물 등의 액체를 이용하는 특수한 성형법으로서, 액압에 의해 성형을 하는 방법이다.In general, the hydroforming method is a special molding method using a liquid such as water, and is a method of molding by hydraulic pressure.

도 3a와 도 3b는 종래의 하이드로포밍법을 나타내는 단면도로서, 하이드로포밍법을 적용하여 실시하는 튜브(40)의 확관작업을 나타내고 있다.3A and 3B are sectional views showing a conventional hydroforming method, showing the expansion of the tube 40 to which the hydroforming method is applied.

이를 참조하여 종래의 하이드로포밍법을 설명하면 다음과 같다.Referring to this, a conventional hydroforming method will be described.

도 3a에 도시한 바와 같이, 통상의 하이드로포밍법은 소정의 형상으로 확관하고자 하는 튜브(40)를 상기 형상에 대응하는 형상을 가진 상/하형의 금형(10) 사이에 넣고, 상기 튜브(40) 내에 물을 공급하여 수압으로써 상기 튜브(40)를 금형(10)의 형상대로 확관시키는 방법이다.As shown in FIG. 3A, in a conventional hydroforming method, a tube 40 to be expanded into a predetermined shape is inserted between upper and lower molds 10 having a shape corresponding to the shape, and the tube 40 is formed. ), The tube 40 is expanded in the shape of the mold 10 by water pressure.

이때, 물은 양 측의 실린더(20)를 통해 공급되게 된다.At this time, the water is supplied through the cylinder 20 on both sides.

그러나, 상기와 같이 실시되는 하이드로포밍법은 튜브(40) 내부가 물과 직접 접촉되므로 튜브(40) 내부가 부식되기 쉽고, 튜브(40) 끝단과 실린더(20) 사이에서압력손실이 생기게 된다.However, in the hydroforming method implemented as described above, since the inside of the tube 40 is in direct contact with water, the inside of the tube 40 is easily corroded, and a pressure loss occurs between the end of the tube 40 and the cylinder 20.

특히, 두께가 얇고 지름이 큰 단면을 갖는 튜브(40)를 성형할 때, 튜브(40) 끝단과 실린더(20) 사이의 시일링에 문제가 생겨 압력손실과 물의 누수로 성형이 불가해지게 된다.In particular, when forming the tube 40 having a thin thickness and a large diameter cross section, a problem arises in the sealing between the end of the tube 40 and the cylinder 20, and molding is impossible due to pressure loss and water leakage.

또 다른 방법으로는 도 3b에 도시한 바와 같이 팽창 가능한 포밍 액튜에이터(30a)를 금형(10) 사이에 장착된 튜브(40) 내에 삽입하고, 상기 포밍 액튜에이터(30a)에 물를 공급하여 수압으로써 상기 튜브(40)를 금형(10)의 형상대로 확관시키는 방법이 있다.Alternatively, as shown in FIG. 3B, the expandable forming actuator 30a is inserted into the tube 40 mounted between the molds 10, the water is supplied to the forming actuator 30a, and the tube is supplied with water pressure. There is a method of expanding the 40 into the shape of the mold 10.

상기의 포밍 액튜에이터(30a)를 이용한 하이드로포밍법은 튜브(40) 내부가 물와 접촉하지 않으므로 부식의 염려가 없고, 압력손실이 없기 때문에 고난도 성형이 가능하며, 길이가 긴 제품도 성형할 수 있다.In the hydroforming method using the forming actuator 30a, since the inside of the tube 40 does not come into contact with water, there is no fear of corrosion, and since there is no pressure loss, high degree of molding is possible, and a long product can be formed.

그러나, 종래의 포밍 액튜에이터(30a)를 이용한 하이드로포밍법에서는 원하는 튜브(40) 형상이 복잡해질 경우, 튜브(40)를 장착하거나 성형된 튜브(40)를 금형(10) 밖으로 꺼내는데 어려움이 생기는 문제점이 있었다.However, in the conventional hydroforming method using the forming actuator 30a, when the shape of the desired tube 40 becomes complicated, it is difficult to mount the tube 40 or take the molded tube 40 out of the mold 10. There was a problem.

본 발명은 상기와 같은 문제점을 감안하여 안출한 것으로서, 벨로우즈 형상의 포밍 액튜에이터를 튜브 내에 삽입하고, 실린더를 통해 공급되는 액체의 압력으로 튜브를 성형시킴으로써, 튜브 내부의 부식을 방지하고, 압력손실을 없애며, 시일링 상태의 개선으로 물의 누수가 방지될 수 있는 벨로우즈 포밍 액튜에이터를 이용한 하이드로포밍법을 제공하는데 그 목적이 있다.The present invention has been made in view of the above problems, by inserting a bellows-shaped forming actuator into the tube, and forming the tube with the pressure of the liquid supplied through the cylinder, thereby preventing corrosion in the tube, pressure loss It is an object of the present invention to provide a hydroforming method using a bellows forming actuator which can prevent water leakage by improving the sealing state.

또한, 벨로우즈 내부의 액압감소시 팽창된 벨로우즈가 자동으로 접혀질 수 있도록 함으로써, 상기 튜브를 금형에 용이하게 장착하거나 제거할 수 있도록 한 벨로우즈 포밍 액튜에이터를 이용한 하이드로포밍법을 제공하는데 그 목적이 있다.In addition, an object of the present invention is to provide a hydroforming method using a bellows forming actuator which enables the expanded bellows to be automatically folded when the hydraulic pressure inside the bellows is reduced, so that the tube can be easily mounted or removed from the mold.

도 1은 본 발명에 따른 하이드로포밍법에서 벨로우즈의 초기 장착상태를 나타내는 단면도1 is a cross-sectional view showing an initial mounting state of the bellows in the hydroforming method according to the present invention

도 2는 본 발명에 따른 하이드로포밍법에서 벨로우즈가 팽창된 상태를 나타내는 단면도Figure 2 is a cross-sectional view showing a state in which the bellows expanded in the hydroforming method according to the present invention

도 3a와 3b는 종래의 하이드로포밍법을 나타내는 단면도3A and 3B are cross-sectional views showing a conventional hydroforming method.

<도면의 주요 부분에 대한 부호의 설명><Explanation of symbols for the main parts of the drawings>

10 : 금형20 : 실린더10: mold 20: cylinder

30 : 벨로우즈 포밍 액튜에이터32 : 벨로우즈 케이스30: bellows forming actuator 32: bellows case

34 : 벨로우즈36 : 토션 스프링34: bellows 36: torsion spring

40 : 튜브40 tube

이하, 첨부도면을 참조하여 본 발명을 설명하면 다음과 같다.Hereinafter, the present invention will be described with reference to the accompanying drawings.

본 발명에 따른 벨로우즈 포밍 액튜에이터를 이용한 하이드로포밍법은 튜브(40)의 내측으로 삽입되는 벨로우즈 케이스(32)와;The hydroforming method using the bellows forming actuator according to the present invention includes a bellows case 32 inserted into the tube 40;

접혀진 상태로 상기 벨로우즈 케이스(32)에 내장되고 내부의 액압증가시 튜브(40)의 내측에서 팽창되는 벨로우즈(34)와;A bellows (34) embedded in the bellows case (32) in a folded state and expanded inside the tube (40) when the hydraulic pressure increases therein;

상기 벨로우즈(34)의 일측에 고정되어 상기 밸로우즈(34)의 내부 액압감소시 팽창된 상기 벨로우즈(34)가 다시 접혀지도록 하는 토션 스프링(36);A torsion spring (36) fixed to one side of the bellows (34) to allow the expanded bellows (34) to be folded back when the internal hydraulic pressure of the bellows (34) is reduced;

이 장착된 벨로우즈 포밍 액튜에이터(30)를 구성하고, 금형(10) 사이에 장착된 성형하고자 하는 튜브(40)의 끝단에 상기 벨로우즈 케이스(32)가 삽입되도록 상기 벨로우즈 포밍 액튜에이터(30)를 장착한 후, 실린더(10)를 통해 상기 벨로우즈(34)에 액체를 공급함으로써 상기 튜브(40)를 성형하는 것을 특징으로 한다.The bellows forming actuator 30 is mounted, and the bellows forming actuator 30 is mounted so that the bellows case 32 is inserted into the end of the tube 40 to be molded between the molds 10. After that, the tube 40 is formed by supplying a liquid to the bellows 34 through the cylinder 10.

전술한 바와 같이, 하이드로포밍법은 물 등의 액체를 이용하는 특수한 성형법으로서, 액압에 의해 성형을 하는 방법이다.As described above, the hydroforming method is a special molding method using a liquid such as water, and is a method of molding by hydraulic pressure.

이하, 첨부도면을 참조하여 본 발명을 좀 더 상세히 설명하면 다음과 같다.Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

첨부한 도 1은 본 발명에 따른 하이드로포밍법에서 벨로우즈의 초기 장착상태를 나타내는 단면도이고, 도 2는 본 발명에 따른 하이드로포밍법에서 벨로우즈가 팽창된 상태를 나타내는 단면도이다.1 is a cross-sectional view showing an initial mounting state of the bellows in the hydroforming method according to the present invention, Figure 2 is a cross-sectional view showing an expanded state of the bellows in the hydroforming method according to the present invention.

이에 도시한 바와 같이, 본 발명에 따른 하이드로포밍법은 벨로우즈 형상의 포밍 액튜에이터(30) 일부를 튜브(40) 내에 삽입하고, 이를 기존의 실린더(20)에 장착하여 상기 실린더(20)로써 공급되는 물의 압력으로 튜브(40)를 성형하게 된다.As shown in the drawing, the hydroforming method according to the present invention inserts a part of the bellows-forming foaming actuator 30 into the tube 40, and mounts it on the existing cylinder 20 to be supplied to the cylinder 20. The tube 40 is molded by the pressure of water.

상기 벨로우즈 포밍 액튜에이터(30)에는 성형하고자 하는 튜브(40) 내측으로 삽입되는 벨로우즈 케이스(32)와, 상기 벨로우즈 케이스(32) 내에서 접혀질 수 있도록 설치되는 벨로우즈(34)와, 상기 벨로우즈(34)의 일측에 고정되어 상기 벨로우즈(34)가 다시 접혀질 수 있도록 하는 토션 스프링(36)이 장착된다.The bellows forming actuator 30 has a bellows case 32 inserted into the tube 40 to be molded, a bellows 34 installed to be folded in the bellows case 32, and the bellows 34. The torsion spring 36 is fixed to one side thereof so that the bellows 34 can be folded again.

본 발명의 벨로우즈 포밍 액튜에이터(30)는 튜브(40) 길이에 따라 튜브(40) 일측이나 양측의 실린더(20)에 장착될 수 있다.Bellows forming actuator 30 of the present invention can be mounted to the cylinder 20 on one side or both sides of the tube 40, depending on the length of the tube (40).

또한, 실린더(20)에 장착된 상태의 액튜에이터(30)를 성형하고자 하는 튜브(40)의 끝단에 고정하고, 상기 벨로우즈(34)가 접혀진 상태로 내장되어 있는 벨로우즈 케이스(32)를 튜브(40) 내측으로 삽입시킨다.In addition, the actuator 30 mounted on the cylinder 20 is fixed to the end of the tube 40 to be molded, and the bellows case 32 in which the bellows 34 is folded is built in the tube 40. ) Insert it inside.

상기 토션 스프링(36)은 꼬여진 일단이 액튜에이터(30)에 장착되고, 벨로우즈 케이스(32) 내측으로 벨로우즈(34)를 따라 설치되어 타단이 벨로우즈(34)의 반대편 일측에 고정된다.The torsion spring 36 is twisted one end is mounted to the actuator 30, is installed along the bellows 34 into the bellows case 32, the other end is fixed to the opposite side of the bellows (34).

튜브(40)의 성형시에는 상기 토션 스프링(36)이 벨로우즈(34)의 팽창과 함께펼쳐지게 되고, 성형이 끝나게 되면 수압이 제거되면서 팽창된 상태의 벨로우즈(34)가 상기 토션 스프링(36)의 탄성력에 의해 다시 접혀지도록 되어 있다.When the tube 40 is molded, the torsion spring 36 is expanded with the expansion of the bellows 34. When the molding is completed, the bellows 34 in the expanded state is removed while the hydraulic pressure is removed. It is to be folded back by the elastic force.

상기 벨로우즈(34)가 팽창되거나 접혀질 때, 벨로우즈(34)가 출입하게 되는 벨로우즈 케이스(32)의 끝단은 벨로우즈(34)가 접힐 때 걸리지 않도록 곡선부(32a)로 가공처리한다.When the bellows 34 is inflated or folded, the end of the bellows case 32 into which the bellows 34 enters and exits is processed by the curved portion 32a so as not to be caught when the bellows 34 is folded.

상기 벨로우즈(34)는 누수되지 않도록 제작되어야 하며, 바람직하게는 확관이 용이하도록 유연성을 갖는 고무나 섬유 재질로써 제작된다.The bellows 34 should be manufactured so as not to leak, preferably made of rubber or fiber material having flexibility to facilitate expansion.

상기 벨로우즈 포밍 액튜에이터(30)를 이용한 하이드로포밍법을 적용하여 튜브(40)를 소정의 형상으로 확관하기 위해서는 상기 형상에 대응하는 형상을 가진 상/하형의 금형(10) 사이에 튜브(40)를 넣고, 상기 튜브(40) 내에 실린더(20)로부터 수로가 형성된 벨로우즈(34)를 삽입한 후, 공급되는 물의 수압으로써 상기 튜브(40)를 금형(10)의 형상대로 확관시키게 된다.In order to expand the tube 40 to a predetermined shape by applying the hydroforming method using the bellows forming actuator 30, the tube 40 is disposed between the upper and lower molds 10 having a shape corresponding to the shape. After inserting the bellows 34 in which the channel is formed from the cylinder 20 in the tube 40, the tube 40 is expanded in the shape of the mold 10 by the water pressure of the supplied water.

이와 같이 하여, 본 발명에 따른 하이드로포밍법은 튜브(40) 내부가 물과 접촉되지 않으므로 부식방지와 작업장의 환경개선을 이룰 수 있고, 시일링의 문제점과 압력손실이 발생되지 않으며, 벨로우즈(34)가 복원되므로 금형(10)에 튜브(40)를 장착하거나 빼낼 때 용이하다.In this way, the hydroforming method according to the present invention can achieve corrosion prevention and environmental improvement of the workplace because the tube 40 is not in contact with water, the sealing problems and pressure loss does not occur, bellows (34) ) Is easily restored when the tube 40 is mounted or removed from the mold 10.

이상에서 상술한 바와 같이, 본 발명에 따른 벨로우즈 포밍 액튜에이터를 이용한 하이드로포밍법에 의하면 벨로우즈 형상의 포밍 액튜에이터를 튜브 내에 삽입하고, 실린더를 통해 공급되는 액체의 압력으로 튜브를 성형시킴으로써, 튜브 내부의 부식을 방지하고, 압력손실을 없애며, 시일링 상태의 개선으로 물의 누수가 방지될 수 있는 효과가 있다.As described above, according to the hydroforming method using the bellows forming actuator according to the present invention, the bellows-forming forming actuator is inserted into the tube, and the tube is formed by the pressure of the liquid supplied through the cylinder to corrode the inside of the tube. To prevent the pressure loss, and to improve the sealing state, there is an effect that can prevent the leakage of water.

또한, 벨로우즈 내부의 액압감소시 팽창된 벨로우즈가 자동으로 접혀질 수 있도록 함으로써, 상기 튜브를 금형에 용이하게 장착하거나 제거할 수 있는 효과가 있다.In addition, by allowing the expanded bellows to be automatically folded when the hydraulic pressure inside the bellows is reduced, there is an effect that the tube can be easily mounted or removed from the mold.

Claims (1)

튜브(40)의 내측으로 삽입되는 벨로우즈 케이스(32)와;A bellows case 32 inserted into the tube 40; 접혀진 상태로 상기 벨로우즈 케이스(32)에 내장되고 내부의 액압증가시 튜브(40)의 내측에서 팽창되는 벨로우즈(34)와;A bellows (34) embedded in the bellows case (32) in a folded state and expanded inside the tube (40) when the hydraulic pressure increases therein; 상기 벨로우즈(34)의 일측에 고정되어 상기 밸로우즈(34)의 내부 액압감소시 팽창된 상기 벨로우즈(34)가 다시 접혀지도록 하는 토션 스프링(36);A torsion spring (36) fixed to one side of the bellows (34) to allow the expanded bellows (34) to be folded back when the internal hydraulic pressure of the bellows (34) is reduced; 이 장착된 벨로우즈 포밍 액튜에이터(30)를 구성하고, 금형(10) 사이에 장착된 성형하고자 하는 튜브(40)의 끝단에 상기 벨로우즈 케이스(32)가 삽입되도록 상기 벨로우즈 포밍 액튜에이터(30)를 장착한 후, 실린더(10)를 통해 상기 벨로우즈(34)에 액체를 공급함으로써 상기 튜브(40)를 성형하는 것을 특징으로 하는 벨로우즈 포밍 액튜에이터를 이용한 하이드로포밍법.The bellows forming actuator 30 is mounted, and the bellows forming actuator 30 is mounted so that the bellows case 32 is inserted into the end of the tube 40 to be molded between the molds 10. Then, the hydroforming method using a bellows forming actuator, characterized in that for forming the tube (40) by supplying a liquid to the bellows (34) through a cylinder (10).
KR10-2000-0065236A 2000-11-03 2000-11-03 Hydroforming method using bellows forming actuator KR100379955B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR10-2000-0065236A KR100379955B1 (en) 2000-11-03 2000-11-03 Hydroforming method using bellows forming actuator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR10-2000-0065236A KR100379955B1 (en) 2000-11-03 2000-11-03 Hydroforming method using bellows forming actuator

Publications (2)

Publication Number Publication Date
KR20020034736A true KR20020034736A (en) 2002-05-09
KR100379955B1 KR100379955B1 (en) 2003-04-16

Family

ID=19697149

Family Applications (1)

Application Number Title Priority Date Filing Date
KR10-2000-0065236A KR100379955B1 (en) 2000-11-03 2000-11-03 Hydroforming method using bellows forming actuator

Country Status (1)

Country Link
KR (1) KR100379955B1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20030090378A (en) * 2002-05-23 2003-11-28 최용태 Forming apparatus for bellows
KR200453844Y1 (en) * 2011-04-01 2011-05-30 김영달 popcorn cooking device
KR101419197B1 (en) * 2014-01-07 2014-07-14 손호영 Hydroforming apparatus

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100584489B1 (en) 2005-03-30 2006-05-29 주식회사 성우하이텍 A hydro-forming system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20030090378A (en) * 2002-05-23 2003-11-28 최용태 Forming apparatus for bellows
KR200453844Y1 (en) * 2011-04-01 2011-05-30 김영달 popcorn cooking device
KR101419197B1 (en) * 2014-01-07 2014-07-14 손호영 Hydroforming apparatus

Also Published As

Publication number Publication date
KR100379955B1 (en) 2003-04-16

Similar Documents

Publication Publication Date Title
JP4477227B2 (en) Method and apparatus for hydraulic forming without bending of bent tubular part
ES2185309T3 (en) FRAME MEMBER FOR VEHICLE WITH SHOCK ABSORBER ASSEMBLY AND MANUFACTURING PROCEDURE OF SUCH PART.
KR100379955B1 (en) Hydroforming method using bellows forming actuator
JP4669276B2 (en) Mold vent
EP1366318B1 (en) Coupling for connection of a tube or hose by pushing-in
JPS59156730A (en) Mold releasing method for inner mold in rubber like elastic molded product
JP3046550B2 (en) Case integrated connector and molding method thereof
KR100633244B1 (en) Sealing apparatus for a foaming mould using expansive tube
JP4778739B2 (en) Exhaust pipe and manufacturing method thereof
KR20010042289A (en) Tubular plate and corresponding production method
JP2008062435A (en) Method of manufacturing cylindrical-core-equipped molding
JPH04284209A (en) Foam molding assembly
JP4622653B2 (en) Hydroform molding machine and hydroform mechanical seal
JP2006122943A (en) Nozzle for hydraulic forming, and hydraulic forming apparatus
CN100571920C (en) Bender
KR20040100517A (en) Hydroforming-forming device for steel tube in automobile which is effective on improvement of sealing
KR100405706B1 (en) Axial punch for conical hydroforming
JP4790136B2 (en) Hydroform sealing device for thin-walled steel pipes
KR100336691B1 (en) Hydroforming process using forming actuator
KR20020045723A (en) Axial punch for hydro-forming
KR101034126B1 (en) Method for closing tube using ring member in hydroforming process
KR20030034912A (en) Hydroforming molding apparatus using compress casting
JP2001239330A (en) Fluid pressure bulge-forming method of metal tube
JPS5854010B2 (en) Method for manufacturing heat-shrinkable branch pipes
KR100187150B1 (en) Method of blow moulding

Legal Events

Date Code Title Description
A201 Request for examination
E701 Decision to grant or registration of patent right
GRNT Written decision to grant
LAPS Lapse due to unpaid annual fee