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KR20160103198A - Apparatus for manufacturing a steel tube with varying thicknesses - Google Patents

Apparatus for manufacturing a steel tube with varying thicknesses Download PDF

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Publication number
KR20160103198A
KR20160103198A KR1020150025008A KR20150025008A KR20160103198A KR 20160103198 A KR20160103198 A KR 20160103198A KR 1020150025008 A KR1020150025008 A KR 1020150025008A KR 20150025008 A KR20150025008 A KR 20150025008A KR 20160103198 A KR20160103198 A KR 20160103198A
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South Korea
Prior art keywords
tube
mandrel
cooling medium
unit
cooling
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KR1020150025008A
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Korean (ko)
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KR101663598B1 (en
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박재근
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(주)유창산공
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Priority to KR1020150025008A priority Critical patent/KR101663598B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
    • B21C1/16—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes
    • B21C1/22—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes specially adapted for making tubular articles
    • B21C1/24—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes specially adapted for making tubular articles by means of mandrels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C3/00—Profiling tools for metal drawing; Combinations of dies and mandrels
    • B21C3/02—Dies; Selection of material therefor; Cleaning thereof
    • B21C3/12—Die holders; Rotating dies
    • B21C3/14—Die holders combined with devices for guiding the drawing material or combined with devices for cooling heating, or lubricating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C3/00—Profiling tools for metal drawing; Combinations of dies and mandrels
    • B21C3/16—Mandrels; Mounting or adjusting same

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Extraction Processes (AREA)

Abstract

The present invention relates to a device for manufacturing a tube, comprising: a drawing mold which includes a shaft diameter guide part whose diameter is gradually reduced from an entrance with a large diameter to an escape with a small diameter for passing a tube to be processed; a mandrel unit which includes a mandrel inserted into the tube to be processed to support an inner diameter part of the tube to be processed, and a supporting rod connected to the mandrel to be extended along a longitudinal direction of the tube, wherein a cooling medium passing hole in which a cooling medium passes is formed on the mandrel and the supporting rod; a tube heating part which heats the tube supplied to the drawing mold; a tube propelling part which propels the tube toward the drawing mold along a longitudinal direction; a tube fetching part which fetches the tube drawn from the drawing mold; a cooling medium supply part which supplies a cooling medium into the cooling medium passing hole of the mandrel unit; and a drawing mold cooling part which cools the drawing mold. Accordingly, a tube with a dense structure and an excellent texture, whose molding method is easy, can be manufactured by combining advantages of a hot forming method and a cold forming method.

Description

가변두께 스틸튜브 제조장치 {Apparatus for manufacturing a steel tube with varying thicknesses}TECHNICAL FIELD [0001] The present invention relates to a variable-thickness steel tube manufacturing apparatus,

본 발명은 가변두께 스틸튜브 제조장치에 관한 것이다.The present invention relates to a variable thickness steel tube manufacturing apparatus.

길이방향을 따라 내벽의 두께가 변화하는 가변두께 스틸튜브는, 내력이 필요한 부위에서는 두꺼운 두께로 충분한 강도를 확보할 수 있는 한편, 외력이 비교적 적게 작용하는 부위에서는 두께를 줄여 경량화를 도모할 수 있으므로, 전기 자동차 등의 구조물로서 수요가 크게 증대할 것으로 예견된다.The variable-thickness steel tube, in which the thickness of the inner wall changes along the longitudinal direction, can secure a sufficient strength with a thick thickness at a portion where a proof stress is required, while reducing the thickness at a portion where an external force is relatively small, , And electric vehicles, it is predicted that demand will increase significantly.

이러한 가변두께 스틸튜브의 제조를 위해 기존에 제안되어 있는 제조방법들은 크게 열간성형과 냉간성형으로 나뉜다. 열간성형은 대체로 튜브의 외표면을 가열하면서 길이방향으로 압축 혹은 인장력을 가하여 해당 부위의 두께를 변화시킨다. 이 방법은 가변두께 스틸튜브의 제조가 비교적 용이하다는 장점이 있지만 균일한 외경의 가변두께 튜브를 얻기 어렵다. 제조된 가변두께 스틸튜브의 외경이 균일하지 못하므로 외면가공이나 벤딩 등의 후공정을 부가하여 제조할 수 있는 더 정교하고 복잡한 제품의 제조에는 적합하지 못하다는 단점이 있다.The manufacturing methods proposed to manufacture such variable thickness steel tubes are classified into hot forming and cold forming. Hot forming generally changes the thickness of the part by heating the outer surface of the tube and applying compression or tensile force in the longitudinal direction. This method is advantageous in that it is relatively easy to manufacture a variable-thickness steel tube, but it is difficult to obtain a variable-thickness tube having a uniform outer diameter. Since the outer diameter of the manufactured variable-thickness steel tube is not uniform, it is not suitable for manufacturing a more elaborate and complicated product that can be manufactured by adding a post-process such as outer surface machining or bending.

냉간성형 방법에서는 인발성형 방식이 주로 채용된다. 이 방식은 튜브를 인발금형에 통과시킬 때 튜브의 내경에 맨드릴을 삽입하고, 맨드릴의 위치를 길이방향을 따라 소폭 이동시켜 인발된 튜브의 두께가 가변되도록 한다. 이 방법에 의해 제조된 가변두께 스틸튜브는 매끄럽고 균일한 외표면을 가지고 있어 벤딩 등의 후공정의 작업성을 높여준다는 장점이 있다. 그러나 소재의 소성변형성이 낮기 때문에 생산성이 비교적 낮다는 단점이 있다.In the cold forming method, a draw-forming method is mainly employed. In this method, a mandrel is inserted into the inner diameter of the tube when the tube is passed through the drawing die, and the position of the mandrel is slightly moved along the longitudinal direction so that the thickness of the drawn tube is variable. The variable thickness steel tube manufactured by this method has a smooth and uniform outer surface, which enhances the workability of a post-process such as bending. However, since the plastic deformation of the material is low, the productivity is relatively low.

따라서 본 발명의 목적은 균일한 외경을 가지는 가변두께 튜브를 높은 생산성으로 제조할 수 있는 가변두께 스틸튜브 제조장치를 제공하는 것이다. Accordingly, an object of the present invention is to provide a variable-thickness steel tube manufacturing apparatus capable of manufacturing a variable-thickness tube having a uniform outer diameter with high productivity.

상기한 본 발명의 목적은 가공대상 튜브의 통과를 위해 대경의 도입구로부터 소경의 도출구까지 점진적으로 직경이 축소되는 축경안내부를 갖는 인발금형과, 상기 가공대상 튜브의 내부에 삽입되어 인발 시 상기 가공대상 튜브의 내경부를 지지하는 맨드릴과, 상기 맨드릴에 연결되어 상기 튜브의 길이방향을 따라 연장된 지지로드를 가지며, 상기 맨드릴과 상기 지지로드에는 냉각매체가 통과하는 냉각매체통과공이 형성되어 있는 맨드릴유니트와, 상기 인발금형에 공급되는 상기 튜브를 가열하는 튜브가열부와, 상기 튜브를 상기 인발금형을 향해 길이방향을 따라 추진하는 튜브추진부와, 상기 인발금형으로부터 도출되는 상기 튜브를 인출하는 튜브인출부와, 상기 맨드릴유니트의 상기 냉각매체통과공 내에 냉각매체를 공급하는 냉각매체공급부와, 상기 인발금형을 냉각하는 인발금형냉각부를 포함하는 것을 특징으로 하는 길이방향을 따라 내벽 두께가 다른 튜브의 제조장치에 의해서 달성된다. SUMMARY OF THE INVENTION It is an object of the present invention to provide a drawing die having a diametrical guide portion whose diameter is gradually reduced from a large diameter lead portion to a small diameter lead portion for passing a tube to be processed, A mandrel for supporting an inner diameter portion of the tube to be processed and a support rod connected to the mandrel and extending along the longitudinal direction of the tube, wherein the mandrel and the support rod have a cooling medium passage hole through which the cooling medium passes A tube pushing unit for pushing the tube along the length direction toward the drawing die, and a tube pushing unit for pulling out the tube led out from the pulling mold A cooling medium supply unit for supplying a cooling medium into the cooling medium passage of the mandrel unit, And a drawing die cooling section for cooling the drawn metal mold. The apparatus for manufacturing a tube having different wall thickness along the longitudinal direction is provided.

여기서 상기 튜브가열부는 고주파 가열기를 포함하는 것이 더욱 바람직하다.More preferably, the tube heating section includes a high-frequency heater.

또한, 상기 인발금형냉각부는 적어도 하나의 냉각수통과공을 포함하는 것이 인발금형 냉각에 있어서 바람직하다.In addition, the drawing die cooling section preferably includes at least one cooling water passage hole for cooling the drawing die.

또한, 상기 맨드릴유니트와 연결되며 상기 맨드릴유니트를 상기 튜브 내에서 길이방향을 따라 왕복 이동시키는 맨드릴컨트롤부를 더 포함하는 것이 더욱 바람직하다.The apparatus may further include a mandrel control unit connected to the mandrel unit and reciprocally moving the mandrel unit in the tube along its longitudinal direction.

상술한 본 발명의 구성에 따르면 균일한 외경을 가지는 가변두께 튜브를 높은 생산성으로 제조할 수 있다. According to the above-described constitution of the present invention, a variable-thickness tube having a uniform outer diameter can be manufactured with high productivity.

도 1은 본 발명에 따른 튜브 제조장치의 단면도이고,
도 2는 본 발명에 따른 튜브 제조장치의 제어 구조도이다.1 is a cross-sectional view of a tube manufacturing apparatus according to the present invention,
2 is a control structure diagram of a tube manufacturing apparatus according to the present invention.

이하, 본 발명에 따른 실시예를 도면을 참조하여 설명하기로 한다.Hereinafter, embodiments according to the present invention will be described with reference to the drawings.

도 1에 도시된 바와 같이 본 발명에 따른 가변두께 스틸튜브 제조장치(100)는 가공대상 튜브(10)가 통과되는 인발금형(110)과 튜브(10)의 내에서 튜브(10)의 두께를 조절하는 맨드릴유니트(120)로 이루어진다. 1, an apparatus 100 for manufacturing a variable-thickness steel tube according to the present invention includes a drawing die 110 through which a tube 10 to be processed passes and a tube 10 And a mandrel unit 120 to be adjusted.

인발금형(110)은 도넛형상으로 가공대상 튜브(10)가 통과되는 튜브통과공(111)이 인발금형(110)의 축선을 따라 형성되어있다. 튜브통과공(111)에는 튜브(10)의 통과를 위해 대경의 도입구(111a)로부터 소경의 도출구(111b)까지 점진적으로 직경이 축소되는 축경안내부(111c)가 형성된다. 또한, 인발금형(110)의 내부에는 튜브(10)의 인발 시 인발금형(110)의 온도상승을 억제하기 위하여 냉각수통과공(112)이 마련된다. 냉각수통과공(112)은 금형냉각부(P)와 연결되며, 금형냉각부(P)에서 공급된 냉각수는 냉각수통과공(112)을 통해 인발금형(110)내부를 순환하며 인발금형(110)을 냉각시킨다. 가공대상 튜브(10)는 이러한 인발금형(110)을 통과하면서 단면적이 줄어들고 길이방향으로 늘어나 가공 전보다 외경이 축소되어 인발된다.The drawing die 110 has a tube passage hole 111 through which the object tube 10 passes in a donut shape along the axis of the drawing die 110. The tube passing hole 111 is formed with a diametrical guide portion 111c whose diameter is gradually reduced from the large diameter inlet 111a to the small diameter outlet 111b for passing the tube 10 therethrough. In addition, a cooling water passage hole 112 is provided in the interior of the drawing die 110 to suppress the temperature rise of the drawing die 110 when the tube 10 is drawn out. The cooling water passage hole 112 is connected to the mold cooling section P and the cooling water supplied from the mold cooling section P circulates in the drawing metal mold 110 through the cooling water passage hole 112, . The cross section of the tube 10 to be processed passes through the drawing die 110, is reduced in length, is drawn in the longitudinal direction, and is reduced in diameter.

가공 전 가공대상 튜브(10)는 일정한 외경과 내경을 가진다. 튜브(10)의 일단에는 튜브(10)를 길이방향으로 인발금형(110)을 향하여 추진하는 튜브추진부(130)가 설치된다. 튜브추진부(130)는 추진롤러(131)를 포함하며 상기 추진롤러(131)에 의해 튜브(10)는 인발금형(110)으로 이동된다. 튜브(10)의 타단에는 인발금형(110)으로부터 도출되는 튜브(10)를 인출하는 튜브인출부(140)가 설치된다. 튜브인출부(140)는 튜브물림조오(141)를 포함하며 상기 튜브물림조오(141)에 의해 튜브(10)는 길이방향으로 당겨진다. 도시된 실시예에서는 튜브(10)를 밀고 당기는 수단으로 추진롤러(131)를 가지는 튜브추진부(130)와 튜브물림조오(141)를 포함하는 튜브인출부(140)로 도시하였지만 튜브추진부(130)에 가압피스톤을 이용하여 튜브(10)를 미는 구성과 튜브인출부(140)에 인출롤러를 이용하여 당기는 구성 등의 다양한 방법으로 튜브(10)를 밀고 당길 수 있다.The to-be-processed tube 10 before machining has a constant outer diameter and an inner diameter. At one end of the tube 10, a tube propelling unit 130 for propelling the tube 10 toward the drawing die 110 in the longitudinal direction is installed. The tube pushing unit 130 includes a pushing roller 131 and the tube 10 is moved to the pulling mold 110 by the pushing roller 131. At the other end of the tube 10, a tube draw-out portion 140 for drawing out the tube 10 led out from the drawn metal mold 110 is provided. The tube withdrawal portion 140 includes a tube jaw 141 which is pulled in the longitudinal direction by the tube jaw 141. Although shown in the illustrated embodiment as a tube withdrawal 140 that includes a tube pusher 130 having a pusher roller 131 and a tube jaw 141 as a means of pushing and pulling the tube 10, The tube 10 can be pushed and pulled by various methods such as pushing the tube 10 using a pressure piston to the tube drawing part 130 and pulling the tube drawing part 140 using a drawing roller.

한편, 본 발명에 따른 가변두께 스틸튜브 제조장치(100)는 튜브(10)의 길이방향에 인발금형(110)으로 공급되는 튜브(10)를 가열하기 위한 튜브가열부(150)가 설치된다. 튜브가열부(150)는 통상 멀티턴 코일로 된 고주파 가열기로 만들어진다. 멀티턴 코일로 된 고주파 가열기는 튜브(10)를 둘러싸며 전자 유도에 의해 에너지를 튜브(10)에 전달하여 가열한다. 가열된 튜브(10)는 연성이 증가하여 인발금형(110)에서 보다 쉽게 성형될 수 있다. 도시된 실시예에서 튜브가열부(150)는 멀티턴 코일로 된 고주파 가열기로 구현되었지만, 저주파가열, 유전가열, 마이크로파가열 등을 이용한 전자파가열기 또는 레이저 가열기로 대체될 수 있다. 가공대상 튜브(10)는 튜브추진부(130)의 추진 및 튜브인출부(140)의 인장에 의해 인발금형(110)을 통과하고 인발금형(110)을 통과하는 동안 맨드릴유니트(120)에 의해 튜브(10) 내벽의 두께가 변화된다.In the variable thickness steel tube manufacturing apparatus 100 according to the present invention, a tube heating part 150 for heating the tube 10 supplied to the drawing die 110 in the longitudinal direction of the tube 10 is installed. The tube heating portion 150 is usually made of a high frequency heater made of multi-turn coils. A high-frequency heater made of a multi-turn coil surrounds the tube 10 and transfers energy to the tube 10 by electromagnetic induction to heat it. The heated tube 10 can be molded more easily in the drawing die 110 because of increased ductility. In the illustrated embodiment, the tube heating portion 150 is embodied as a high-frequency heater made of a multi-turn coil, but an electromagnetic wave using a low-frequency heating, dielectric heating, microwave heating, or the like can be replaced by an electromagnetic heater or a laser heater. The tube 10 to be processed is passed by the mandrel unit 120 while passing through the drawing die 110 and passing through the drawing die 110 by the pushing of the tube pushing part 130 and the pulling of the tube drawing part 140 The thickness of the inner wall of the tube 10 is changed.

맨드릴유니트(120)는 튜브(10)의 내부에 삽입되어 인발 시 튜브(10)의 내경부를 지지하는 맨드릴(121)과, 맨드릴(121)에 연결되어 튜브(10)의 길이방향을 따라 연장된 지지로드(122)를 가지며, 맨드릴(121)과 지지로드(122)에는 냉각매체가 통과하는 냉각매체통과공(123)이 형성된다. 맨드릴(121)의 냉각매체통과공(123)에는 맨드릴(121)의 축선방향에서 가로방향으로 분기된 적어도 하나의 냉각분기통로가 형성된다. 냉각매체통과공(123)에 공급되는 냉각매체는 냉각매체공급부(B)에 의해 공급된다. 냉각매체공급부(B)는 공랭식 또는 수랭식의 매체를 사용할 수 있으며, 냉각매체공급부(B)를 통해 공급된 냉각매체는 지지로드(122) 및 맨드릴(121)의 냉각매체통과공(123)을 통해 지지로드(122)와 맨드릴(121)을 냉각시킨다. 도시된 실시예에서는 냉각매체가 냉각매체통과공(123)을 통해 맨드릴(121)을 통과하는 방식으로 구현되었지만 경우에 따라서 냉각매체통과공(123)을 통해 공급되는 냉각매체는 이중경로를 통해 회수되어 내부 순환 되는 방식 또한 가능하다. The mandrel unit 120 includes a mandrel 121 which is inserted into the tube 10 and supports the inner diameter portion of the tube 10 at the time of withdrawal and a mandrel 121 which is connected to the mandrel 121 and extends along the longitudinal direction of the tube 10 And a cooling medium passage hole 123 through which the cooling medium passes is formed in the mandrel 121 and the support rod 122. At least one cooling branch passage branched in the transverse direction in the axial direction of the mandrel 121 is formed in the cooling medium passage hole 123 of the mandrel 121. The cooling medium supplied to the cooling medium passage hole 123 is supplied by the cooling medium supply section B. The cooling medium supply unit B can use an air-cooling or water-cooling medium and the cooling medium supplied through the cooling medium supply unit B can be supplied through the cooling medium passage hole 123 of the support rod 122 and the mandrel 121 Thereby cooling the support rod 122 and the mandrel 121. Although in the illustrated embodiment, the cooling medium is implemented in such a manner that the cooling medium passes through the mandrel 121 through the cooling medium passage hole 123, the cooling medium supplied through the cooling medium passage hole 123 as the case may be, And the internal circulation is also possible.

맨드릴(121)은 축경안내부(111c)와 상응하는 형상으로 직경이 다른 제1 단부(121a)와 제2 단부(121b)를 가진다. 맨드릴(121)의 제1 단부(121a)는 제2 단부(121b)보다 직경이 크고 축경안내부(111c)에 형성된 소경의 도출구(111b)보다 직경이 크다. 맨드릴(121)의 제1 단부(121a)와 제2 단부(121b)는 서로 연결되어 있으며, 제2 단부(121b)로 향할수록 직경이 점진적으로 축소된다.The mandrel 121 has a first end portion 121a and a second end portion 121b having different diameters in a shape corresponding to the diametral guide portion 111c. The first end portion 121a of the mandrel 121 is larger in diameter than the second end portion 121b and larger in diameter than the small diameter outlet port 111b formed in the shaft diameter guide portion 111c. The first end 121a and the second end 121b of the mandrel 121 are connected to each other and the diameter gradually decreases toward the second end 121b.

맨드릴(121)과 맨드릴(121)에 연결된 지지로드(122)는 도시하지 않은 맨드릴컨트롤부(124)에 연결되어 튜브(10)의 내에서 길이방향을 따라 왕복운동을 한다. 맨드릴(121)이 도출구(111b)의 방향으로 접근하면 튜브(10)의 내벽은 조여져 튜브(10)의 내벽 두께는 줄어든다. 반대로 맨드릴(121)이 도출구(111b)로부터 멀어지면 그와 같은 수축은 영향을 받지 않는다. 이러한 동작의 반복으로 인해 튜브(10)는 외벽은 일정한 외경을 가지면서 내벽은 길이방향을 따라 원하는 위치에서 다양한 두께를 가지어 응력이 집중되는 곳을 보강하도록 할 수 있다.The support rod 122 connected to the mandrel 121 and the mandrel 121 is connected to a mandrel control unit 124 (not shown) and reciprocates along the longitudinal direction within the tube 10. When the mandrel 121 approaches the direction of the outlet 111b, the inner wall of the tube 10 is tightened to reduce the thickness of the inner wall of the tube 10. Conversely, if the mandrel 121 is moved away from the outlet 111b, such shrinkage is not affected. Due to the repetition of this operation, the tube 10 can have a constant outer diameter of the outer wall, while the inner wall has various thicknesses at desired positions along the length direction, so that the stress concentration can be reinforced.

이와 같은 가변두께 스틸튜브의 제조과정은 제어부(200)를 통해 제어된다. 제어부(200)는 사용자가 입력부(210)를 통해 설정한 입력값에 따라 튜브추진부(130)와 튜브인출부(140) 및 튜브가열부(150)를 동작시켜 튜브를 인발시키고, 맨드릴컨트롤부(124)를 제어하여 튜브(10) 내부의 두께를 가변화한다. 또한 인발금형(110)을 거쳐 도출되는 튜브(10)의 온도를 측정하여 튜브냉각부(AC)를 제어하여 튜브(10)를 냉각시키고, 인발과정에서 맨드릴냉각부(C)와 금형냉각부(P)를 제어하여 맨드릴유니트(120)와 인발금형(110)을 냉각시킨다. 도출된 튜브(10)의 온도는 인발금형(110)의 도출부에 배치된 비접촉 온도센서(220)를 통해 측정된다. 그리고 튜브인출부(140) 부근에는 자기센서 또는 초음파센서와 같은 두께센서(230)가 설치되어 도출된 튜브(10)의 두께 측정이 가능하다. 측정된 두께값은 제어부(200)로 전송되며, 제어부(200)는 측정된 두께값을 기초로 두께를 조정할 수 있다. 만약 측정된 두께가 입력값 대비 허용오차를 벗어날 경우, 맨드릴컨트롤부(124), 튜브추진부(130), 튜브인출부(140) 및 튜브가열부(150)를 제어하여 실시간으로 튜브(10) 두께를 보정한다. 제어부(200)를 통해 제어되는 모든 과정 및 측정된 결과는 표시부(240)를 통해 보여지며, 사용자는 이를 통해 가변두께 스틸튜브의 제작과정을 확인 가능하다.The process of manufacturing such a variable-thickness steel tube is controlled through the control unit 200. The control unit 200 operates the tube propulsion unit 130 and the tube extraction unit 140 and the tube heating unit 150 to extract the tube according to the input value set by the user through the input unit 210, (124) to vary the thickness of the inside of the tube (10). Also, the temperature of the tube 10 led out through the drawing die 110 is measured to control the tube cooling unit AC to cool the tube 10, and during the drawing process, the mandrel cooling unit C and the mold cooling unit P to control the mandrel unit 120 and the drawing die 110 to be cooled. The temperature of the derived tube 10 is measured through the non-contact temperature sensor 220 disposed at the lead-out portion of the drawing die 110. A thickness sensor 230 such as a magnetic sensor or an ultrasonic sensor is installed near the tube outlet 140 to measure the thickness of the tube 10. The measured thickness value is transmitted to the controller 200, and the controller 200 can adjust the thickness based on the measured thickness value. If the measured thickness is out of tolerance with respect to the input value, the mandrel control unit 124, the tube propulsion unit 130, the tube withdrawal unit 140, and the tube control the heating unit 150, Correct the thickness. All processes controlled by the controller 200 and the measured results are displayed through the display unit 240, and the user can confirm the manufacturing process of the variable-thickness steel tube.

상술한 구성으로 가공대상 튜브(10)는 튜브추진부(130)에 의한 추진력으로 인발금형(110)에 삽입된다. 삽입되는 튜브(10)의 연성을 높이기 위하여 공급되는 튜브(10)는 튜브(10)의 길이방향에서 튜브가열부(150)에 의해 가열된 채로 삽입되고, 인발금형(110)에 삽입된 튜브(10)는 인발금형(110)의 축경안내부(111c)에 의하여 단면적이 줄어들고 길이방향으로 늘어나 가공 전보다 외경이 축소되어 인발된다. 튜브(10)가 인발되는 동안 발생되는 열을 식히기 위해 인발금형(110)엔 냉각수가 내부 순환되고, 맨드릴유니트(120)에는 냉각매체가 순환 또는 통과된다. 인발금형(110)에 의해 튜브(10)의 단면적이 줄어드는 동안 튜브 내부의 벽 두께를 변화하기 위해 맨드릴(121)이 튜브(10) 내로 삽입된다. 맨드릴(121)이 인발금형(110)의 도출구(111b)쪽으로 소폭 접근하면 튜브(10)의 내벽은 조여져 내벽 두께는 줄어들고 반대로 도출구(111b)로부터 소폭 멀어지면 튜브(10)의 내벽은 수축을 받지 않아 두께의 변화가 없다. 이렇게 단면적이 줄어들고 내벽의 두께가 변화된 튜브(10)는 튜브인출부(140)에 의하여 인장되어 작업의 효율을 높인다. 튜브(10)가 인장되는 동안 튜브(10)에 남아있는 열에 의한 튜브(10)의 변형을 방지하기 위해 튜브(10)가 도출되는 길이방향을 따라서 튜브냉각부(AC)가 설치된다. 튜브냉각부(AC)는 분사노즐(160)을 통해 냉각매체를 분사시킨다. 튜브(10)를 냉각하는 방식은 냉각매체에 따라 공랭식 또는 수랭식으로 이루어진다. 냉각공기 또는 냉각수는 분사노즐(160)을 통해 도출되는 튜브(10)로 분사되고 튜브냉각부(AC)의 냉각으로 인해 튜브(10)는 잔열에 의한 변형이 방지된다.With the above-described configuration, the workpiece tube 10 is inserted into the drawing die 110 by the driving force of the tube driving unit 130. The tube 10 supplied for increasing the ductility of the inserted tube 10 is inserted in the longitudinal direction of the tube 10 while the tube is heated by the heating portion 150 and the tube 10 inserted into the drawing die 110 10 is reduced in cross sectional area by the diametrical guide portion 111c of the drawing die 110 and stretched in the longitudinal direction, and the outer diameter is reduced from that before machining. In order to cool the heat generated during the drawing of the tube 10, the cooling metal is circulated in the drawing die 110, and the cooling medium is circulated or passed through the mandrel unit 120. The mandrel 121 is inserted into the tube 10 to change the wall thickness inside the tube while the cross-sectional area of the tube 10 is reduced by the drawing die 110. [ The inner wall of the tube 10 is tightened so that the thickness of the inner wall is reduced and when the mandrel 121 is slightly away from the outlet 111b of the drawing die 110, The thickness is not changed. The tube 10 having a reduced cross-sectional area and a thickness of the inner wall is pulled by the tube draw-out part 140 to increase the efficiency of the work. A tube cooling unit (AC) is installed along the longitudinal direction from which the tube (10) is drawn to prevent deformation of the tube (10) due to heat remaining in the tube (10) while the tube (10) is being pulled. The tube cooling unit (AC) injects the cooling medium through the injection nozzle (160). The method of cooling the tube 10 is air-cooled or water-cooled according to the cooling medium. The cooling air or cooling water is injected into the tube 10 led out through the injection nozzle 160 and the tube 10 is prevented from being deformed by the residual heat due to the cooling of the tube cooling part AC.

100 : 가변두께 스틸튜브 제조장치
10 : 튜브 110 : 인발금형
111: 튜브통과공 112: 냉각수통과공
120 : 맨드릴유니트 124: 맨드릴컨트롤부
130 : 튜브추진부 131: 추진롤러
140 : 튜브인출부 141: 튜브물림조오
150 : 튜브가열부 160 : 분사노즐
200 : 제어부 210 : 입력부
220 : 온도센서 230 : 두께센서
240 : 표시부 AC : 튜브냉각부
P : 금형냉각부 C : 맨드릴냉각부 100: Variable Thickness Steel Tube Making Machine
10: tube 110: drawing die
111: tube passing hole 112: cooling water passing hole
120: mandrel unit 124: mandrel control unit
130: tube pushing part 131: pushing roller
140: tube withdrawal part 141: tube is jammed
150: tube is heated part 160: injection nozzle
200: control unit 210: input unit
220: Temperature sensor 230: Thickness sensor
240: Display portion AC: Tube cooling portion
P: mold cooling section C: mandrel cooling section

Claims (4)

튜브 제조 장치에 있어서,
가공대상 튜브의 통과를 위해 대경의 도입구로부터 소경의 도출구까지 점진적으로 직경이 축소되는 축경안내부를 갖는 인발금형과;
상기 가공대상 튜브의 내부에 삽입되어 인발 시 상기 가공대상 튜브의 내경부를 지지하는 맨드릴과, 상기 맨드릴에 연결되어 상기 튜브의 길이방향을 따라 연장된 지지로드를 가지며, 상기 맨드릴과 상기 지지로드에는 냉각매체가 통과하는 냉각매체통과공이 형성되어 있는 맨드릴유니트와;
상기 인발금형에 공급되는 상기 튜브를 가열하는 튜브가열부와;
상기 튜브를 상기 인발금형을 향해 길이방향을 따라 추진하는 튜브추진부와;
상기 인발금형으로부터 도출되는 상기 튜브를 인출하는 튜브인출부와;
상기 맨드릴유니트의 상기 냉각매체통과공 내에 냉각매체를 공급하는 냉각매체공급부와;
상기 인발금형을 냉각하는 인발금형냉각부를 포함하는 것을 특징으로 하는 튜브 제조 장치.A tube manufacturing apparatus comprising:
A drawing metal mold having a diametral guide portion whose diameter is gradually reduced from a large diameter lead portion to a small lead portion for passage of a tube to be processed;
And a support rod connected to the mandrel and extending along the longitudinal direction of the tube, wherein the mandrel and the support rod are provided with a support rod, A mandrel unit in which a cooling medium passage hole through which the cooling medium passes is formed;
A tube for heating the tube supplied to the drawing die;
A tube propulsion unit for propelling the tube along the length direction toward the drawing die;
A tube withdrawing portion for withdrawing the tube led out from the drawing die;
A cooling medium supply unit for supplying a cooling medium into the cooling medium passage of the mandrel unit;
And a drawing die cooling unit for cooling the drawing die. 제1 항에 있어서,
상기 가열부는 고주파 가열기를 포함하는 것을 특징으로 하는 튜브 제조 장치.The method according to claim 1,
Wherein the heating unit includes a high-frequency heater. 제1 항에 있어서,
상기 인발금형냉각부는 적어도 하나의 냉각수통과공을 포함하는 것을 특징으로 하는 튜브 제조 장치.The method according to claim 1,
Wherein the drawing die cooling section includes at least one cooling water passage hole. 제1 항에 있어서,
상기 맨드릴유니트와 연결되며, 상기 맨드릴유니트를 상기 튜브 내에서 길이방향을 따라 왕복 이동시키는 맨드릴컨트롤부를 더 포함하는 것을 특징으로 하는 튜브 제조 장치.The method according to claim 1,
Further comprising a mandrel control unit connected to the mandrel unit and reciprocally moving the mandrel unit in a longitudinal direction within the tube.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101858739B1 (en) * 2017-10-12 2018-06-28 주식회사 진알루폴 Drawn product cooling apparatus
WO2019220398A3 (en) * 2018-05-15 2021-10-07 裕廊百利鎂合金材料科技有限公司 Magnesium alloy butted tube drawing mechanism

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Publication number Priority date Publication date Assignee Title
JPH0824954B2 (en) * 1987-08-07 1996-03-13 金井 宏之 Wire drawing device
KR200279848Y1 (en) * 2002-02-19 2002-07-02 정임근 Cooling Device for the Dies in Drawing Process
JP2010131617A (en) * 2008-12-03 2010-06-17 Sumitomo Metal Ind Ltd Method of manufacturing ultra-thin wall seamless metallic pipe using floating plug

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0824954B2 (en) * 1987-08-07 1996-03-13 金井 宏之 Wire drawing device
KR200279848Y1 (en) * 2002-02-19 2002-07-02 정임근 Cooling Device for the Dies in Drawing Process
JP2010131617A (en) * 2008-12-03 2010-06-17 Sumitomo Metal Ind Ltd Method of manufacturing ultra-thin wall seamless metallic pipe using floating plug

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101858739B1 (en) * 2017-10-12 2018-06-28 주식회사 진알루폴 Drawn product cooling apparatus
WO2019220398A3 (en) * 2018-05-15 2021-10-07 裕廊百利鎂合金材料科技有限公司 Magnesium alloy butted tube drawing mechanism

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