JP4981718B2 - Bulge forming method and bulge forming apparatus - Google Patents

Bulge forming method and bulge forming apparatus Download PDF

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JP4981718B2
JP4981718B2 JP2008062277A JP2008062277A JP4981718B2 JP 4981718 B2 JP4981718 B2 JP 4981718B2 JP 2008062277 A JP2008062277 A JP 2008062277A JP 2008062277 A JP2008062277 A JP 2008062277A JP 4981718 B2 JP4981718 B2 JP 4981718B2
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mold
rod
supply port
pressure
seal
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JP2009214156A (en
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卓生 小林
出 堀
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Honda Motor Co Ltd
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Description

本発明は、金型とロッドとの間に配置された素管にその軸線方向の圧縮応力を付与し、素管内に圧液を供給しながら、ロッドを軸線方向に移動させることにより素管を金型の内面形状に成形するバルジ成形方法およびバルジ成形装置に係り、特に素管とロッドの間をシールするシール部の改良に関する。   The present invention applies a compressive stress in the axial direction to a raw tube arranged between a mold and a rod, and moves the rod in the axial direction while supplying pressurized liquid into the raw tube. The present invention relates to a bulge forming method and a bulge forming apparatus for forming an inner surface shape of a mold, and more particularly to an improvement in a seal portion for sealing between a raw tube and a rod.

容器・加工管や、自動車・各種機械の中空構造部品などの成形には、バルジ成形方法が適用されている。バルジ成形方法では、素管を減肉させることなく局部的に膨出させて拡管させることにより、素管を所望形状に成形している。これにより得られるバルジ成形管としては、多数の膨出部分を有する蛇腹状部分のフレキシブルな曲げを可能としたフレキ管や、通常の管より表面積が大きい特徴を利用して放熱などを行うベローズ管、蛇腹状部分の形状を利用してそこにスプリングのような弾力機能を持たせた蛇腹管などがある。   A bulge forming method is applied to molding containers, processed tubes, and hollow structural parts of automobiles and various machines. In the bulge forming method, the raw pipe is formed into a desired shape by locally expanding and expanding the pipe without reducing the thickness. As a bulge forming tube obtained by this, a flexible tube that allows flexible bending of the bellows-shaped portion having a large number of bulged portions, and a bellows tube that performs heat dissipation using a feature that has a larger surface area than a normal tube There is a bellows tube that uses the shape of the bellows-like portion and has a spring-like elasticity function.

バルジ成形方法では、たとえば図3に示すバルジ成形装置1が用いられる(たとえば特許文献1参照)。図3は、バルジ成形装置1の概略構成を表す側断面図である。なお、図3では、バルジ成形装置1の上半分の構成を表している。また、図示の簡略化のため、全ての図面において、金型10に対する素管2の右端の位置を同じとしている。バルジ成形装置1は、内部に素管2が配置される金型10と、素管2の左端部が突き当てられる突当て金型20を備えている。金型10および突当て金型20は、1対の上型および下型から構成されている。金型10,20は、それらの開放を防止する固定手段(図示略)により固定されている。   In the bulge forming method, for example, a bulge forming apparatus 1 shown in FIG. 3 is used (see, for example, Patent Document 1). FIG. 3 is a side sectional view showing a schematic configuration of the bulge forming apparatus 1. In addition, in FIG. 3, the structure of the upper half of the bulge forming apparatus 1 is represented. For simplification of illustration, the position of the right end of the element tube 2 with respect to the mold 10 is the same in all drawings. The bulge forming apparatus 1 includes a mold 10 in which the raw tube 2 is disposed, and a butting mold 20 against which the left end portion of the raw tube 2 is abutted. The mold 10 and the abutment mold 20 are composed of a pair of upper mold and lower mold. The molds 10 and 20 are fixed by fixing means (not shown) for preventing them from being opened.

金型10の内面は、複数の山部11Aと谷部11Bとが交互に形成された蛇腹形状11を有している。山部11Aおよび谷部11Bは、たとえば周期的に形成されるとともに軸線対称形状を有している。素管2の内部には、その軸線方向に沿って移動可能にロッド30が設けられている。ロッド30の内部には圧液供給流路31が形成され、そこから圧液供給口31Aを通じて素管2とロッド30との間に圧液Lが供給される。   The inner surface of the mold 10 has a bellows shape 11 in which a plurality of peak portions 11A and valley portions 11B are alternately formed. The peak portions 11A and the valley portions 11B are formed, for example, periodically and have an axially symmetrical shape. A rod 30 is provided inside the raw tube 2 so as to be movable along the axial direction thereof. A pressure liquid supply channel 31 is formed inside the rod 30, and the pressure liquid L is supplied from the raw tube 2 and the rod 30 through the pressure liquid supply port 31 </ b> A.

ロッド30の周方向表面には、圧液供給口31Aを間にして1対の溝32,33が形成されている。溝32,33には、素管2とロッド30との間をシールするリング状の1対のシール部40,50が配置されている。ロッド30における成形方向反対側のシール部50よりも左側には、成形に使用された圧液Lを回収するための圧液回収流路(図示略)が形成されている。回収された圧液Lは、圧液供給流路31に供給され、再使用される。ロッド30の右端部には、ロッド30を軸線方向右側(成形方向側)に移動させるための移動機構(図示略)が設けられている。金型10の右側には、突当て金型20に向けて素管2に圧縮応力Fを付与する素管押圧機構(図示略)が設けられている。   A pair of grooves 32 and 33 are formed on the circumferential surface of the rod 30 with the pressure liquid supply port 31A therebetween. In the grooves 32, 33, a pair of ring-shaped seal portions 40, 50 that seal between the raw tube 2 and the rod 30 are disposed. A pressure liquid recovery channel (not shown) for recovering the pressure liquid L used for molding is formed on the left side of the seal portion 50 on the opposite side of the molding direction in the rod 30. The recovered pressure liquid L is supplied to the pressure liquid supply channel 31 and is reused. A movement mechanism (not shown) for moving the rod 30 to the right in the axial direction (molding direction side) is provided at the right end of the rod 30. On the right side of the mold 10, an element tube pressing mechanism (not shown) that applies compressive stress F to the element tube 2 toward the abutting mold 20 is provided.

バルジ成形装置1では、左端部が突当て金型20に突き当てられた素管2に対して、その右端部から軸線方向左側(成形方向反対側)へ圧縮応力Fを付与しながら、圧液供給口31Aから素管2とロッド30との間に圧液Lを供給する。圧液Lは、素管2が金型10の蛇腹形状11の山部11Aに応じて変形可能となるように高圧に設定され、シール部40,50は、素管2とロッド30との間をシールしている。このような状態でロッド30を軸線方向右側に移動させ、金型10の山部11Aに対応する位置に圧液Lが供給される毎に、素管2が高圧の圧液Lによってその山部11Aの形状に応じて膨出する。このようにして素管2には、山部2Aおよび谷部2Bが右側から順に1個ずつ成形されていくことにより、金型10の蛇腹形状11に対応する形状に拡管成形される。   In the bulge forming apparatus 1, while applying compressive stress F from the right end portion to the left side in the axial direction (opposite side in the forming direction), the pressure fluid is applied to the raw tube 2 whose left end portion is abutted against the abutting mold 20. The pressurized liquid L is supplied between the raw tube 2 and the rod 30 from the supply port 31A. The pressure liquid L is set to a high pressure so that the base tube 2 can be deformed according to the peak portion 11 </ b> A of the bellows shape 11 of the mold 10, and the seal portions 40 and 50 are disposed between the base tube 2 and the rod 30. Is sealed. In such a state, each time the rod 30 is moved to the right in the axial direction and the pressure liquid L is supplied to a position corresponding to the peak portion 11A of the mold 10, the base tube 2 is moved to the peak portion by the high pressure liquid L. It bulges according to the shape of 11A. In this way, the base tube 2 is formed into a shape corresponding to the bellows shape 11 of the mold 10 by forming the crest 2A and the trough 2B one by one in order from the right side.

しかしながら、バルジ成形装置1による拡管成形では、素管の膨出のために圧液Lを高圧にしているから、1個目の山部2Aの成形後、圧液供給口31Aが金型10の山部11A,11A間を移動する毎に、シール部40,50による密閉性に次のような問題が生じていた。   However, in the pipe expansion molding by the bulge molding apparatus 1, the pressure liquid L is set to a high pressure for the expansion of the raw tube, so that the pressure liquid supply port 31 </ b> A of the mold 10 is formed after the first peak 2 </ b> A is molded. Whenever it moves between the mountain parts 11A and 11A, the following problems have arisen in the sealing performance by the seal parts 40 and 50.

拡管成形では、たとえば図4(A)に示すように素管2に山部2Aを成形した後、次の山部(3個目の山部)の成形のため、図4(B)に示すように圧液Lの高圧を維持した状態でロッド30を図の矢印方向に移動させると、成形方向側のシール部40が、金型10におけるロッド30との間隔が大きな部分である3個目の山部11Aを通過する。このとき、素管2は、3個目の山部11Aの形状に応じて膨出するため、成形方向側のシール部40には、金型10からの押圧力が加わりくくなる。その結果、第1シール部40による密閉性が低くなり、そこから右側外部へ圧液Lが漏出する虞がある。このため、圧液Lの高圧を維持するために液圧を高める必要が生じ、時間のロスが発生する。   In the pipe expansion molding, for example, as shown in FIG. 4 (A), a ridge 2A is formed in the raw tube 2, and then the next ridge (third ridge) is formed as shown in FIG. 4 (B). When the rod 30 is moved in the direction of the arrow in the state in which the high pressure of the pressure liquid L is maintained as described above, the seal portion 40 on the molding direction side is the third portion in which the distance from the rod 30 in the mold 10 is large. Pass through the mountain 11A. At this time, since the raw tube 2 bulges according to the shape of the third peak portion 11A, the pressing force from the mold 10 is not easily applied to the sealing portion 40 on the molding direction side. As a result, the sealing performance by the first seal portion 40 is lowered, and there is a possibility that the pressurized liquid L leaks from the right outside. For this reason, in order to maintain the high pressure of the pressurized liquid L, it is necessary to increase the hydraulic pressure, and time loss occurs.

一方、成形方向反対側のシール部50が、図4(B)に示すように素管2に成形された1個目の山部2Aを通過する時、シール部50とその山部2Aとの間に大きな隙間が形成されるため、そこから左側外部へ圧液Lが漏出する虞がある。このため、圧液Lの高圧を維持するために液圧を高める必要が生じ、時間のロスが発生する。以上のようなシール部40,50による密閉性の問題は、1個目の山部2Aの成形後、圧液供給口31Aが金型10の山部11A,11A間を移動する毎に生じる。   On the other hand, when the seal part 50 on the opposite side in the molding direction passes through the first peak part 2A formed in the raw tube 2 as shown in FIG. 4B, the seal part 50 and the peak part 2A Since a large gap is formed between them, the pressure liquid L may leak out from there to the left side. For this reason, in order to maintain the high pressure of the pressurized liquid L, it is necessary to increase the hydraulic pressure, and time loss occurs. The above-described problem of airtightness due to the seal portions 40 and 50 occurs every time the pressurized liquid supply port 31A moves between the ridge portions 11A and 11A of the mold 10 after the first ridge portion 2A is formed.

なお、成形方向側のシール部40による密閉性の問題については、金型10の蛇腹形状11に対するシール部40,50の位置に応じて圧液Lの液圧設定を高圧と低圧との間で切換える対策が考えられる。   In addition, about the problem of the airtightness by the seal | sticker part 40 by the side of a shaping | molding direction, according to the position of the seal | sticker parts 40 and 50 with respect to the bellows shape 11 of the metal mold | die 10, the hydraulic pressure setting of the hydraulic fluid L is between high pressure and low pressure. Possible measures to switch.

たとえば図5(A)に示すように1個目の山部2Aを成形した後、図5(B)に示すように次の山部の成形のためロッド30を軸線方向右側(図中の矢印方向)に移動させる前に、素管2が変形不能となるように圧液Lを低圧にする。続いて、圧液供給口31Aを2個目の山部11A近傍に到着させ、かつ、成形方向側のシール部40をその2個目の山部11Aの右隣の谷部11Bに到着させることにより、そこでシール部40を保持する。次いで、図5(C)に示すようにロッド30の移動を停止し、圧液Lを高圧にすることにより、素管2に2個目の山部2Aを成形する。   For example, after forming the first peak 2A as shown in FIG. 5 (A), the rod 30 is moved to the right in the axial direction (arrow in the figure) for forming the next peak as shown in FIG. 5 (B). Before moving in the direction), the pressure liquid L is set to a low pressure so that the raw tube 2 cannot be deformed. Subsequently, the pressure liquid supply port 31A arrives in the vicinity of the second peak portion 11A, and the seal portion 40 on the molding direction side arrives at the valley portion 11B adjacent to the right of the second peak portion 11A. Therefore, the seal portion 40 is held there. Next, as shown in FIG. 5C, the movement of the rod 30 is stopped, and the pressure liquid L is set to a high pressure, thereby forming the second peak 2 </ b> A on the raw tube 2.

続いて、図5(D)に示すように、図5(B)と同様な動作を行い、圧液Lの液圧を低圧にし、圧液供給口31Aを3個目の山部11A近傍に到着させ、かつ、成形方向側のシール部40をその3個目の山部11Aの右隣の谷部11Bに到着させることにより、そこでシール部40を保持する。このような圧液Lの液圧設定の高圧と低圧との間で切換えを、山部2Aの成形および圧液供給口31Aの山部11A,11A間の移動毎に行うことにより、成形方向側のシール部40による密閉性の問題が解消される。   Subsequently, as shown in FIG. 5 (D), the same operation as in FIG. 5 (B) is performed, the pressure of the pressure fluid L is lowered, and the pressure fluid supply port 31A is placed near the third peak portion 11A. Then, the seal portion 40 on the molding direction side is made to arrive at the valley portion 11B adjacent to the right side of the third peak portion 11A, thereby holding the seal portion 40 there. By switching between the high pressure and the low pressure of the hydraulic pressure setting of the pressure liquid L every time the peak portion 2A is molded and the pressure liquid supply port 31A is moved between the peak portions 11A and 11A, the molding direction side is changed. The problem of airtightness due to the seal part 40 is eliminated.

しかしながら、圧液Lの液圧設定では、素管2の拡管成形のために高圧と低圧との間での切換えを繰り返す必要があるため、その液圧の切換えに時間がかかり、拡管成形を高速に行うことが困難である。また、圧液Lを常に高圧に保持することができないため、素管2の金型10への形状凍結性が低下し、その結果、拡管成形の精度が低下し、製品のバラツキが多くなる虞がある。特に、素管2に多数の山部2Aを有する蛇腹形状を成形する場合、その問題は深刻である。   However, in the hydraulic pressure setting of the hydraulic fluid L, it is necessary to repeatedly switch between high pressure and low pressure for expanding the raw tube 2, so it takes time to switch the hydraulic pressure, and high speed pipe expansion is performed. Difficult to do. Moreover, since the pressurized liquid L cannot always be kept at a high pressure, the shape freezing property of the base tube 2 to the mold 10 is lowered, and as a result, the accuracy of the tube expansion molding is lowered, and the product variation may increase. There is. In particular, when a bellows shape having a large number of peak portions 2A is formed on the raw tube 2, the problem is serious.

特開2001−321841号公報Japanese Patent Laid-Open No. 2001-321841

したがって、本発明は、圧液の漏出防止を図ることができるのはもちろんのこと、高速でかつ高精度な拡管成形を行うことができるとともに、これにより製品のバラツキの発生を防止することができるバルジ成形方法およびバルジ成形装置を提供することを目的とする。   Therefore, according to the present invention, it is possible not only to prevent the leakage of the pressurized liquid, but also to perform high-speed and high-accuracy tube expansion molding, thereby preventing the occurrence of product variations. An object is to provide a bulge forming method and a bulge forming apparatus.

本発明のバルジ成形方法は、複数の山部と谷部とが交互に形成された内面形状を有する金型の内部に素管を配置し、素管の内部にその軸線方向に沿って、圧液供給口を有するロッドを設け、素管とロッドの間をシールする1対のシール部を圧液供給口を間にして設け、素管に軸線方向の圧縮応力を付与し、圧液供給口から素管内に圧液を供給しながら、ロッドを軸線方向に移動させることにより素管を金型の内面形状に成形するバルジ成形方法であって、成形方向側のシール部に対してロッドから素管へ向かう方向に圧液の液圧を加えることにより、そのシール部を素管の膨出に追従可能とし、シール部どうしの間隔を、金型の内面形状の少なくとも2山分の距離に設定し、成形方向反対側のシール部の軸線方向の長さを、金型の内面形状の少なくとも1山分の距離に設定することを特徴としている。   According to the bulge forming method of the present invention, a raw pipe is disposed inside a mold having an inner surface shape in which a plurality of crests and troughs are alternately formed, and a pressure is applied along the axial direction inside the raw pipe. A rod having a liquid supply port is provided, and a pair of seal portions for sealing between the raw pipe and the rod are provided with the pressure liquid supply port interposed therebetween, and compressive stress in the axial direction is applied to the raw pipe, and the pressure liquid supply port A bulge forming method for forming the base pipe into the inner shape of the mold by moving the rod in the axial direction while supplying the pressure liquid from the base to the base pipe. By applying hydraulic fluid pressure in the direction toward the pipe, the seal part can follow the bulge of the raw pipe, and the distance between the seal parts is set to a distance of at least two peaks of the inner shape of the mold. The axial length of the seal part on the opposite side of the molding direction It is characterized by setting the distance of one peak fraction even without.

本発明のバルジ成形方法では、素管に軸線方向の圧縮応力を付与し、1対のシール部によりシールされた領域に圧液供給口から素管内に圧液を供給しながら、ロッドを軸線方向に移動させているので、金型の山部に対応する位置に圧液が供給される毎に、素管が圧液によってその山部の形状に応じて膨出する。このようにして素管には、山部および谷部がロッドの移動方向反対側(成形方向反対側)から順に1個ずつ成形されていくことにより、金型の内面形状に対応する形状に拡管成形される。   In the bulge forming method of the present invention, the rod is axially applied while applying compressive stress in the axial direction to the raw tube and supplying the pressurized liquid into the raw tube from the pressurized liquid supply port to the region sealed by the pair of seal portions. Therefore, each time the pressurized liquid is supplied to the position corresponding to the peak portion of the mold, the raw tube bulges out according to the shape of the peak portion by the pressurized liquid. In this manner, the crest and trough are formed in the raw tube one by one in order from the opposite side of the rod movement direction (opposite side of the molding direction), thereby expanding the tube to a shape corresponding to the inner shape of the mold. Molded.

ここで、本発明のバルジ成形方法では、素管とロッドとの間をシールする1対のシール部は、成形時に次のように素管と密着することができる。成形方向側のシール部が素管の1つの山部の成形後、金型の次の山部に対応する位置を通過するとき、素管が圧液によってその山部の形状に応じて膨出する。この場合、成形方向側のシール部には、ロッドから素管へ向かう方向に圧液の液圧を加えることにより、成形方向側のシール部を素管の膨出に追従可能としている。したがって、その追従時に、そのシール部の一端部がロッドに接触した状態で、そのシール部の他端部が素管に接触可能となるようにシール部の形状および弾性特性や、圧液の液圧、ロッドの移動速度などを適宜設定することにより、成形方向側のシール部の少なくとも一部は、素管に常に密着することができる。その結果、素管の成形時に常に圧液を高圧に設定しても、成形方向側の外部への圧液の漏出を防止することができる。   Here, in the bulge forming method of the present invention, the pair of seal portions for sealing between the raw tube and the rod can be in close contact with the raw tube at the time of forming. When the sealing part on the molding direction side passes through a position corresponding to the next peak part of the mold after forming one peak part of the base pipe, the base pipe swells according to the shape of the peak part by the pressure liquid. To do. In this case, by applying hydraulic pressure to the sealing portion on the molding direction side in the direction from the rod toward the raw tube, the sealing portion on the molding direction side can follow the expansion of the raw tube. Therefore, at the time of the follow-up, the shape and elastic characteristics of the seal portion and the liquid pressure of the pressure liquid are set so that the other end portion of the seal portion can contact the raw tube while the one end portion of the seal portion is in contact with the rod. By appropriately setting the pressure, the moving speed of the rod, and the like, at least a part of the sealing portion on the molding direction side can always be in close contact with the raw tube. As a result, even when the pressure liquid is always set to a high pressure during the molding of the raw tube, the leakage of the pressure liquid to the outside on the molding direction side can be prevented.

一方、シール部どうしの間隔を、金型の内面形状の少なくとも2山分の距離に設定し、成形方向とは反対側のシール部の軸線方向の長さを、金型の内面形状の少なくとも1山分の距離に設定しているので、成形方向とは反対側のシール部の形状および弾性特性を適宜設定することにより、そのシール部は常に、素管の平坦部および素管の成形された谷部のいずれかと常に密着することができる。その結果、素管の成形時に常に圧液を高圧に設定しても、成形方向反対側の外部への圧液の漏出を防止することができる。なお、シール部どうしの間隔の2山分の距離は、成形される山部の分と、素管への圧縮応力付与による座屈防止のために設定した成形方向反対側の山部の分との合計の距離である。   On the other hand, the interval between the seal portions is set to a distance corresponding to at least two peaks of the inner surface shape of the mold, and the axial length of the seal portion opposite to the molding direction is set to at least 1 of the inner surface shape of the mold. Since the distance is set to the distance between the mountains, by appropriately setting the shape and elastic characteristics of the seal portion on the opposite side to the molding direction, the seal portion is always formed by the flat portion of the blank tube and the blank tube. It can always be in close contact with any of the valleys. As a result, even when the pressure liquid is always set to a high pressure during the molding of the raw tube, the leakage of the pressure liquid to the outside on the opposite side in the molding direction can be prevented. In addition, the distance between the two crests of the gap between the seal portions is the crest portion to be molded and the crest portion on the opposite side in the molding direction set for preventing buckling by applying compressive stress to the raw pipe. Is the total distance.

以上のように本発明のバルジ成形方法では、素管の成形時に常に圧液を高圧に設定しても、圧液の外部への漏出を防止することができるので、液圧の不足分を補填することや液圧を高圧と低圧との間で切換えることが不要となるから、素管の成形を高圧でかつ高速に行うことができる。また、圧液を常に高圧に保持することができるから、素管の金型への形状凍結性が向上し、その結果、拡管成形の精度が向上し、製品のバラツキの発生を防止することができる。さらに圧液が供給される領域は、素管とロッドの間における金型の内面形状に対応する全領域ではなく、素管とロッドの間における1対のシール部によりシールされた領域のみであるから、金型を固定する固定手段の小型化を図ることができ、これによりコストを低減することができる。このようなバルジ成形方法は、肉厚の薄い素管に好適である。   As described above, according to the bulge forming method of the present invention, even if the pressure liquid is always set to a high pressure when forming the raw tube, leakage of the pressure liquid to the outside can be prevented. Therefore, it is not necessary to switch between the high pressure and the low pressure, so that the blank tube can be formed at a high pressure and at a high speed. In addition, since the pressurized liquid can be kept at a high pressure at all times, the shape freezing property of the raw pipe to the mold is improved, and as a result, the accuracy of the tube expansion molding is improved and the occurrence of product variations can be prevented. it can. Further, the region where the pressurized liquid is supplied is not the entire region corresponding to the inner surface shape of the mold between the raw tube and the rod, but only the region sealed by the pair of seal portions between the raw tube and the rod. Therefore, it is possible to reduce the size of the fixing means for fixing the mold, thereby reducing the cost. Such a bulge forming method is suitable for a thin tube.

本発明のバルジ成形方法では、種々の構成を用いることができる。たとえば圧液供給口が金型の山部の中央部に到達したとき、ロッドの移動を一旦停止し、圧液供給口の直上の金型の山部の成形を行うことができる。この態様では、素管の肉厚の厚い場合でも、その成形を金型の内面形状に従って確実に行うことができる。   Various configurations can be used in the bulge forming method of the present invention. For example, when the pressure liquid supply port reaches the center of the crest of the mold, the movement of the rod is temporarily stopped, and the crest of the mold just above the pressure liquid supply port can be formed. In this aspect, even when the raw tube is thick, the molding can be reliably performed according to the inner shape of the mold.

本発明のバルジ成形方法は、バルジ成形装置に適用することができる。すなわち、本発明のバルジ成形装置は、複数の山部と谷部とが交互に形成された内面形状を有するとともに、内部に素管が配置される金型と、素管の内部にその軸線方向に沿って設けられるとともに、圧液供給口を有するロッドと、圧液供給口を間にして設けられるとともに、素管とロッドの間をシールする1対のシール部とを備え、素管に軸線方向の圧縮応力を付与し、圧液供給口から素管内に圧液を供給しながら、ロッドを軸線方向に移動させることにより素管を金型の内面形状に成形するバルジ成形装置であって、成形方向側のシール部に対してロッドから素管へ向かう方向に圧液の液圧を加えるための液圧印加流路が設けられ、そのシール部が、液圧印加流路を通じて加えられた圧液の液圧により素管の膨出に追従可能とされ、シール部どうしの間隔が、金型の内面形状の少なくとも2山分の距離に設定され、成形方向反対側のシール部の軸線方向の長さが、金型の内面形状の少なくとも1山分の距離に設定されていることを特徴としている。本発明のバルジ成形装置は、上記バルジ成形方法と同様な作用・効果を得ることができる。   The bulge forming method of the present invention can be applied to a bulge forming apparatus. That is, the bulge forming apparatus of the present invention has an inner surface shape in which a plurality of crests and troughs are alternately formed, a mold in which a raw pipe is disposed, and an axial direction inside the raw pipe And a pair of seal portions for sealing the gap between the raw pipe and the rod. The rod is provided with an axial line. A bulge forming device that applies a compressive stress in the direction and forms the inner tube into the shape of the inner surface of the mold by moving the rod in the axial direction while supplying the pressurized fluid from the pressurized fluid supply port into the inner tube. A hydraulic pressure application channel is provided for applying hydraulic fluid pressure in the direction from the rod to the raw pipe with respect to the sealing portion on the molding direction side, and the seal portion is pressure applied through the hydraulic pressure application channel. It is possible to follow the expansion of the raw tube by the liquid pressure of the liquid, The distance between the parts is set to a distance of at least two peaks of the inner surface shape of the mold, and the axial length of the seal portion on the opposite side of the molding direction is set to a distance of at least one mountain of the inner surface shape of the mold. It is characterized by being set. The bulge forming apparatus of the present invention can obtain the same actions and effects as the above bulge forming method.

また、本発明のバルジ成形装置は、種々の構成を用いることができる。たとえば、圧液供給口が金型の山部の中央部に到達したとき、ロッドの移動を一旦停止し、圧液供給口の直上の金型の山部の成形を行うことができる。この態様では、上記バルジ成形方法の態様と同様な作用・効果を得ることができる。   The bulge forming apparatus of the present invention can use various configurations. For example, when the pressure liquid supply port reaches the center of the crest of the mold, the movement of the rod is temporarily stopped, and the mold crest just above the pressure liquid supply port can be formed. In this aspect, the same actions and effects as in the aspect of the bulge forming method can be obtained.

本発明のバルジ成形方法またはバルジ成形装置によれば、素管の成形時に常に圧液を高圧に設定しても、圧液の外部への漏出を防止することができるので、液圧の不足分を補填することや液圧を高圧と低圧との間で切換えることが不要となるから、素管の成形を高圧でかつ高速に行うことができる。また、圧液を常に高圧に保持することができるから、素管の金型への形状凍結性が向上し、その結果、拡管成形の精度が向上し、製品のバラツキの発生を防止することができる。   According to the bulge forming method or the bulge forming apparatus of the present invention, even if the pressure liquid is always set to a high pressure when forming the raw pipe, it is possible to prevent leakage of the pressure liquid to the outside. Therefore, it becomes unnecessary to switch between high pressure and low pressure, so that the raw tube can be formed at high pressure and at high speed. In addition, since the pressurized liquid can be kept at a high pressure at all times, the shape freezing property of the raw pipe to the mold is improved, and as a result, the accuracy of the tube expansion molding is improved and the occurrence of product variations can be prevented. it can.

(1)実施形態の構成
以下、本発明の一実施形態について図面を参照して説明する。図1は、本発明の一実施形態に係るバルジ成形装置100の概略構成を表す側断面図である。図1では、バルジ成形装置1の上半分の構成を表している。なお、本実施形態では、図3と同様な構成要素には同符号を付し、その説明は省略している。
(1) Configuration of Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a side sectional view showing a schematic configuration of a bulge forming apparatus 100 according to an embodiment of the present invention. In FIG. 1, the structure of the upper half of the bulge forming apparatus 1 is shown. In the present embodiment, the same components as those in FIG. 3 are denoted by the same reference numerals, and the description thereof is omitted.

ロッド30の内部には圧液供給流路131が形成され、そこから圧液供給口131Aを通じて素管2とロッド30との間に圧液Lが供給される。ロッド30の周方向表面には、圧液供給口131Aを間にして1対の溝132,133が形成されている。溝132,133には、素管2とロッド30との間をシールするリング状の1対のシール部140,150が配置されている。本実施形態では、素管2の成形時のロッド30の移動方向は右側であるから、シール部140は本発明の成形方向側のシール部、シール部150は本発明の成形方向反対側のシール部である。   A pressurized liquid supply channel 131 is formed inside the rod 30, and the pressurized liquid L is supplied from the raw tube 2 and the rod 30 through the pressurized liquid supply port 131 </ b> A therefrom. A pair of grooves 132 and 133 are formed on the circumferential surface of the rod 30 with the pressure fluid supply port 131A therebetween. In the grooves 132 and 133, a pair of ring-shaped seal portions 140 and 150 that seal between the raw tube 2 and the rod 30 are disposed. In this embodiment, since the moving direction of the rod 30 at the time of forming the raw tube 2 is the right side, the seal part 140 is a seal part on the molding direction side of the present invention, and the seal part 150 is a seal on the opposite side of the molding direction of the present invention. Part.

シール部140,150は、たとえば弾性を有している。シール部140は、溝132の内面の右側・左側の側面部全周に接触することにより、そこをシールしている。シール部140と圧液供給口131Aとの間隔は半山分に設定することが好適である。この場合、シール部140が金型10の谷部11Bに対応する位置を通過するとき、圧液供給口131A金型10の山部11Aの中央部に対応する位置に到達することができる。シール部140,150どうしの間隔は、たとえば金型10の蛇腹形状11の2山分の距離に設定されている。シール部150の軸線方向の長さは、金型10の蛇腹形状11の1山分の距離に設定されている。この場合、シール部150の形状および弾性特性を適宜設定することにより、シール部150は、素管2の成形時、素管の平坦部および素管の成形された谷部のいずれかと常に密着することができる。なお、山部11A,11Aどうしの間隔が等間隔でない場合、シール部140,150どうしの間隔である2山分の距離は、隣接する2つの山部の合計距離のなかで最大なものとし、シール部150の軸線方向の長さである1山分の距離は、1山分の距離のなかで最大なものとする。   The seal parts 140 and 150 have elasticity, for example. The seal portion 140 seals the inner surface of the groove 132 by contacting the entire circumference of the right and left side portions. It is preferable to set the interval between the seal part 140 and the pressurized liquid supply port 131A to a half mountain. In this case, when the seal part 140 passes through a position corresponding to the valley part 11B of the mold 10, it can reach a position corresponding to the central part of the peak part 11A of the pressure liquid supply port 131A mold 10. The distance between the seal portions 140 and 150 is set to, for example, a distance corresponding to two peaks of the bellows shape 11 of the mold 10. The length of the seal portion 150 in the axial direction is set to a distance corresponding to one mountain of the bellows shape 11 of the mold 10. In this case, by appropriately setting the shape and elastic characteristics of the seal portion 150, the seal portion 150 is always in close contact with either the flat portion of the blank tube or the trough portion of the blank tube when the blank tube 2 is molded. be able to. In addition, when the intervals between the ridges 11A and 11A are not equal, the distance between the two ridges, which is the interval between the seal portions 140 and 150, is the maximum of the total distance between the two adjacent ridges, The distance for one mountain, which is the length of the seal portion 150 in the axial direction, is the largest of the distances for one mountain.

ロッド30の内部には、圧液供給流路131と溝132とを接続する液圧印加流路134が形成され、液圧印加流路134を通じて圧液Lの液圧が、シール部140に対してロッド30から素管2へ向かう方向に加えられる。これにより、シール部140が、素管2の成形時、素管の膨出に追従可能となっている。この場合、シール部140の下端部がロッド30に接触した状態で、シール部140の上端部が素管2に接触可能となるようにシール部2の形状および弾性特性や、圧液Lの液圧、ロッド30の移動速度などを適宜設定することにより、シール部140の少なくとも一部は、素管2に常に密着することができる。   Inside the rod 30, a fluid pressure application channel 134 that connects the fluid supply channel 131 and the groove 132 is formed, and the fluid pressure of the fluid L is applied to the seal portion 140 through the fluid pressure application channel 134. Then, it is added in the direction from the rod 30 toward the raw tube 2. Thereby, the seal | sticker part 140 can follow the expansion | swelling of a raw tube at the time of shaping | molding of the raw tube 2. As shown in FIG. In this case, the shape and elastic characteristics of the seal portion 2 and the liquid L of the pressure liquid L so that the upper end portion of the seal portion 140 can be in contact with the raw tube 2 while the lower end portion of the seal portion 140 is in contact with the rod 30. By appropriately setting the pressure, the moving speed of the rod 30 and the like, at least a part of the seal portion 140 can always be in close contact with the raw tube 2.

(2)実施形態の動作
次に、バルジ成形装置100によるバルジ成形方法について、図面を参照して説明する。なお、図2のロッド30のなかで図示されている矢印は、ロッド30の移動方向を示している。
(2) Operation of Embodiment Next, a bulge forming method by the bulge forming apparatus 100 will be described with reference to the drawings. Note that the arrows shown in the rod 30 of FIG. 2 indicate the moving direction of the rod 30.

図1に示すように、素管2の左端部を突当て金型20に突き当て、素管2の右端部から軸線方向左側へ圧縮応力Fを付与しながら、1対のシール部140,150によりシールされた領域に圧液供給口131Aから素管2内に圧液Lを供給する。この状態でロッド30を軸線方向右側(成形方向)に移動させることにより、圧液供給口131Aが金型10の山部11Aに対応する位置に到達する毎に、素管2が圧液Lによってその山部11Aの形状に応じて膨出する。このようにして素管2には、山部11Aおよび谷部11Bがロッド30の移動方向(成形方向)とは反対側から順に1個ずつ成形されていき、金型10の内面形状に対応する形状に拡管成形される。   As shown in FIG. 1, a pair of seal portions 140 and 150 are applied while a compressive stress F is applied from the right end portion of the raw tube 2 to the left side in the axial direction by abutting the left end portion of the raw tube 2 against the abutting mold 20. The pressurized liquid L is supplied into the raw tube 2 from the pressurized liquid supply port 131A to the region sealed by the above. By moving the rod 30 to the right in the axial direction (molding direction) in this state, each time the pressure liquid supply port 131A reaches a position corresponding to the peak portion 11A of the mold 10, the base tube 2 is moved by the pressure liquid L. It bulges according to the shape of the peak 11A. In this manner, the peak portion 11 </ b> A and the valley portion 11 </ b> B are formed in the raw tube 2 one by one from the opposite side to the moving direction (molding direction) of the rod 30, and correspond to the inner surface shape of the mold 10. Expanded into a shape.

このような拡管成形において、素管2とロッド30との間をシールする1対のシール部140,150は、素管2の山部2Aの成形時はもちろんのこと、その山部2Aと金型10の次の山部11Aとの間を移動するとき、素管2と密着することができる。たとえば図2(A)に示すように、成形方向側のシール部140が素管2の2個目の山部2Aの成形後、金型10の3個目の山部11Aに対応する位置を通過するとき、素管2が圧液Lによってその山部11Aの形状に応じて膨出する。   In such pipe expansion molding, the pair of seal portions 140 and 150 for sealing between the raw tube 2 and the rod 30 is not limited to the time of forming the crest 2A of the raw tube 2, but the crest 2A and the gold When moving between the next peaks 11 </ b> A of the mold 10, the base tube 2 can be in close contact. For example, as shown in FIG. 2 (A), after the molding portion 2A of the raw tube 2 is molded, the position corresponding to the third peak portion 11A of the mold 10 is formed. When passing, the raw tube 2 is bulged by the pressure liquid L according to the shape of the peak portion 11A.

ここで本実施形態では、成形方向側のシール部140には、ロッド30から素管2へ向かう方向に圧液Lの液圧を加えることにより、シール部140を素管2の膨出に追従可能としている。したがって、その追従時に、そのシール部140の下端部がロッド30に接触した状態で、そのシール部140の上端部が素管2に接触可能となるようにシール部140の形状および弾性特性や、圧液Lの液圧、ロッド30の移動速度などを適宜設定することにより、図2(A)に示すように、成形方向側のシール部140の少なくとも一部は、素管2に常に密着することができる。その結果、素管2の成形時に常に圧液Lを高圧に設定しても、成形方向側の外部への圧液の漏出を防止することができる。   Here, in the present embodiment, the sealing portion 140 follows the bulging of the raw tube 2 by applying hydraulic pressure of the pressurized liquid L to the sealing portion 140 on the molding direction side in the direction from the rod 30 toward the raw tube 2. It is possible. Therefore, at the time of the follow-up, the shape and elastic characteristics of the seal portion 140 so that the upper end portion of the seal portion 140 can be in contact with the raw tube 2 while the lower end portion of the seal portion 140 is in contact with the rod 30, By appropriately setting the hydraulic pressure of the pressurized liquid L, the moving speed of the rod 30, and the like, as shown in FIG. 2A, at least a part of the seal portion 140 on the molding direction side is always in close contact with the raw tube 2. be able to. As a result, even if the pressure liquid L is always set to a high pressure when the raw tube 2 is molded, leakage of the pressure liquid to the outside on the molding direction side can be prevented.

続いて、図2(B)に示すように、素管2の3個目の山部2Aの成形後、成形方向側のシール部140が、金型10の3個目の谷部11Bに対応する位置を通過する。ここで本実施形態では、シール部140,150どうしの間隔を、金型10の内面形状の少なくとも2山分の距離に設定している。これにより、図2(B)に示すように、成形方向側シール部140が金型10の3個目の谷部11に対応する位置を通過するとき、成形方向反対側のシール部150が素管2の2個目の谷部11Bに対応する位置を通過する。   Subsequently, as shown in FIG. 2 (B), after forming the third peak 2 </ b> A of the raw tube 2, the seal part 140 on the molding direction side corresponds to the third valley 11 </ b> B of the mold 10. Pass through the position to be. Here, in this embodiment, the distance between the seal portions 140 and 150 is set to a distance of at least two peaks of the inner surface shape of the mold 10. As a result, as shown in FIG. 2B, when the molding direction side seal portion 140 passes through the position corresponding to the third valley portion 11 of the mold 10, the seal portion 150 on the opposite side in the molding direction is bare. It passes through a position corresponding to the second trough portion 11B of the tube 2.

また、成形方向とは反対側のシール部150の軸線方向の長さを、金型10の内面形状の少なくとも1山分の距離に設定している。これにより、図2(B)に示すように、成形方向反対側のシール部150の両端部は、1個目の山部11Aの両端側の最下部(素管2の左端部の平坦部と素管2の1個目の谷部2B)に対応する位置を通過する。したがって、成形方向とは反対側のシール部150の形状および弾性特性を適宜設定することにより、そのシール部150は常に、1個目の山部11Aの両端側の最下部と密着することができる。その結果、素管2の成形時に常に圧液Lを高圧に設定しても、成形方向反対側の外部への圧液の漏出を防止することができる。   Further, the length in the axial direction of the seal portion 150 opposite to the molding direction is set to a distance of at least one mountain of the inner shape of the mold 10. Thereby, as shown in FIG. 2 (B), both end portions of the seal portion 150 on the opposite side in the molding direction are the lowermost portions on both end sides of the first peak portion 11A (the flat portion at the left end portion of the raw tube 2). It passes through a position corresponding to the first valley 2B) of the raw tube 2. Accordingly, by appropriately setting the shape and elastic characteristics of the seal portion 150 on the side opposite to the molding direction, the seal portion 150 can always be in close contact with the lowermost portions on both ends of the first peak portion 11A. . As a result, even when the pressure liquid L is always set to a high pressure when the raw tube 2 is molded, leakage of the pressure liquid to the outside on the opposite side in the molding direction can be prevented.

次いで、図2(C)に示すように、成形方向側のシール部140が素管2の3個目の山部2Aの成形後、金型10の4個目の山部11Aに対応する位置を通過するとき、素管2が圧液Lによってその山部11Aの形状に応じて膨出する。この場合、成形方向側のシール部140では、図2(B)と同様な動作が行われるので、そのシール部140の少なくとも一部は、素管2に常に密着することができる。その結果、素管2の成形時に常に圧液Lを高圧に設定しても、成形方向側の外部への圧液の漏出を防止することができる。   Next, as shown in FIG. 2C, the position of the seal portion 140 on the molding direction side corresponding to the fourth peak 11 </ b> A of the mold 10 after the third peak 2 </ b> A of the raw tube 2 is molded. When passing through, the raw tube 2 is bulged by the pressure liquid L according to the shape of the peak portion 11A. In this case, since the same operation as that in FIG. 2B is performed in the sealing portion 140 on the molding direction side, at least a part of the sealing portion 140 can always be in close contact with the raw tube 2. As a result, even if the pressure liquid L is always set to a high pressure when the raw tube 2 is molded, leakage of the pressure liquid to the outside on the molding direction side can be prevented.

本実施形態では、以上のようなシール部140,150の動作が、素管2のN個目の山部2Aの成形およびその成形後の金型10の次の山部11Aへの移動時に繰り返し行われることにより、1対のシール部140,150は、成形時に素管2と常に密着することができる。これにより、素管2の成形時に常に圧液Lを高圧に設定しても、圧液Lの外部への漏出を防止することができる。したがって、液圧の不足分を補填することや液圧を高圧と低圧との間で切換えることが不要となるから、素管2の成形を高圧でかつ高速に行うことができる。また、圧液Lを常に高圧に保持することができるから、素管2の金型10への形状凍結性が向上し、その結果、拡管成形の精度が向上し、製品のバラツキの発生を防止することができる。   In the present embodiment, the operations of the seal portions 140 and 150 as described above are repeated when the N-th peak portion 2A of the raw tube 2 is molded and when the mold 10 after the molding moves to the next peak portion 11A. By being performed, the pair of seal portions 140 and 150 can always be in close contact with the raw tube 2 during molding. Thereby, even if the pressure liquid L is always set to a high pressure when the raw tube 2 is formed, leakage of the pressure liquid L to the outside can be prevented. Accordingly, it becomes unnecessary to compensate for the shortage of the hydraulic pressure and to switch the hydraulic pressure between the high pressure and the low pressure, so that the raw tube 2 can be formed at a high pressure and at a high speed. In addition, since the pressurized liquid L can be maintained at a high pressure at all times, the shape freezing property of the raw tube 2 to the mold 10 is improved, and as a result, the accuracy of the tube expansion molding is improved and the occurrence of product variations is prevented. can do.

さらに圧液Lが供給される領域は、素管2とロッド30の間における金型10の内面形状に対応する全領域ではなく、素管2とロッド30の間における1対のシール部140,150によりシールされた領域のみであるから、金型10を固定する固定手段の小型化を図ることができ、これによりコストを低減することができる。このようなバルジ成形方法は、肉厚の薄い素管に好適である。   Further, the region to which the pressurized liquid L is supplied is not the entire region corresponding to the inner surface shape of the mold 10 between the raw tube 2 and the rod 30, but a pair of seal portions 140, between the raw tube 2 and the rod 30. Since it is only the area | region sealed by 150, size reduction of the fixing means which fixes the metal mold | die 10 can be achieved, and, thereby, cost can be reduced. Such a bulge forming method is suitable for a thin tube.

特に、圧液供給口131Aが金型10の山部11Aの中央部に到達したとき、ロッド30の移動を一旦停止し、圧液供給口131Aの直上の金型10の山部11Aの成形を行うことにより、素管2の肉厚の厚い場合でも、その成形を金型10の内面形状11に従って確実に行うことができる。   In particular, when the pressure fluid supply port 131A reaches the center of the peak portion 11A of the mold 10, the movement of the rod 30 is temporarily stopped, and the peak portion 11A of the mold 10 immediately above the pressure fluid supply port 131A is molded. By performing, even if the raw tube 2 is thick, the molding can be reliably performed according to the inner surface shape 11 of the mold 10.

本発明の一実施形態に係るバルジ成形装置の概略構成を表す側断面図である。It is a sectional side view showing a schematic structure of a bulge forming device concerning one embodiment of the present invention. 図1に示すバルジ成形装置を用いたバルジ成形方法の各工程を表し、(A)は素管の3個目の山部の成形時のバルジ成形装置の概略構成を表す側断面図、(B)は素管の3個目の山部の成形直後のバルジ成形装置の概略構成を表す側断面図、(C)は素管の4個目の山部の成形時のバルジ成形装置の概略構成を表す側断面図である。1 represents each step of the bulge forming method using the bulge forming apparatus shown in FIG. 1, and (A) is a side sectional view showing a schematic configuration of the bulge forming apparatus at the time of forming the third peak portion of the raw tube, ) Is a side sectional view showing a schematic configuration of the bulge forming apparatus immediately after forming the third crest of the raw pipe, and (C) is a schematic configuration of the bulge forming apparatus at the time of forming the fourth crest of the raw pipe. FIG. 従来のバルジ成形装置の概略構成を表す側断面図である。It is a sectional side view showing the schematic structure of the conventional bulge forming apparatus. 図3のバルジ成形装置を用いたバルジ成形方法の各工程を表し、(A)は素管の2個目の山部の成形直後のバルジ成形装置の概略構成を表す側断面図、(B)は3個目の山部の成形のためにロッドを移動させているときのバルジ成形装置の概略構成を表す側断面図である。Each step of the bulge forming method using the bulge forming apparatus of FIG. 3 is represented, (A) is a side sectional view showing a schematic configuration of the bulge forming apparatus immediately after forming the second peak portion of the raw tube, (B). These are sectional side views showing the schematic structure of the bulge forming apparatus when the rod is moved for forming the third peak. 図3のバルジ成形装置を用いた他のバルジ成形方法の各工程を表し、(A)は素管の1個目の山部の成形直後のバルジ成形装置の概略構成を表す側断面図、(B)は素管の2個目の山部の成形前のバルジ成形装置の概略構成を表す側断面図、(C)は素管の3個目の山部の成形直後のバルジ成形装置の概略構成を表す側断面図、(D)は素管の3個目の山部の成形前のバルジ成形装置の概略構成を表す側断面図である。Each step of another bulge forming method using the bulge forming apparatus of FIG. 3 is represented, (A) is a side sectional view showing a schematic configuration of the bulge forming apparatus immediately after forming the first peak portion of the raw tube, B) is a side sectional view showing a schematic configuration of the bulge forming apparatus before forming the second crest of the element pipe, and (C) is an outline of the bulge forming apparatus immediately after forming the third crest of the element pipe. A side sectional view showing composition, (D) is a side sectional view showing a schematic structure of a bulge forming device before forming the 3rd peak part of a blank tube.

符号の説明Explanation of symbols

2…素管、10…金型、11…蛇腹形状(内面形状)、11A…山部、11B…谷部、20…突当て金型(金型)、30…ロッド、100…バルジ成形装置、131A…圧液供給口、140…成形方向側のシール部、150…成形方向反対側のシール部、L…圧液   DESCRIPTION OF SYMBOLS 2 ... Elementary tube, 10 ... Mold, 11 ... Bellows shape (inner surface shape), 11A ... Mountain part, 11B ... Valley part, 20 ... Abutment mold (mold), 30 ... Rod, 100 ... Bulge molding apparatus, 131A ... Pressure fluid supply port, 140 ... Seal portion on the molding direction side, 150 ... Seal portion on the opposite side in the molding direction, L ... Pressure fluid

Claims (4)

複数の山部と谷部とが交互に形成された内面形状を有する金型の内部に素管を配置し、前記素管の内部にその軸線方向に沿って、圧液供給口を有するロッドを設け、前記素管と前記ロッドの間をシールする1対のシール部を前記圧液供給口を間にして設け、
前記素管に前記軸線方向の圧縮応力を付与し、前記圧液供給口から前記素管内に圧液を供給しながら、前記ロッドを前記軸線方向に移動させることにより前記素管を前記金型の内面形状に成形するバルジ成形方法において、
成形方向側のシール部に対して前記ロッドから前記素管へ向かう方向に前記圧液の液圧を加えることにより、そのシール部を前記素管の膨出に追従可能とし、
前記シール部どうしの間隔を、前記金型の内面形状の少なくとも2山分の距離に設定し、
前記成形方向反対側のシール部の前記軸線方向の長さを、前記金型の内面形状の少なくとも1山分の距離に設定することを特徴とするバルジ成形方法。
A raw pipe is disposed inside a mold having an inner surface shape in which a plurality of crests and troughs are alternately formed, and a rod having a pressurized liquid supply port is provided along the axial direction inside the raw pipe. Providing a pair of seal portions for sealing between the raw tube and the rod, with the pressure fluid supply port in between,
Applying compressive stress in the axial direction to the raw pipe, and supplying the pressurized liquid into the raw pipe from the pressurized liquid supply port, the rod is moved in the axial direction to move the raw pipe to the mold. In the bulge forming method for forming into an inner shape,
By applying a hydraulic pressure of the pressurized liquid in a direction from the rod toward the element pipe with respect to the seal part on the molding direction side, the seal part can follow the swelling of the element pipe,
The interval between the seal portions is set to a distance of at least two peaks of the inner surface shape of the mold,
A bulge forming method characterized in that a length in the axial direction of the seal portion opposite to the forming direction is set to a distance of at least one mountain of the inner surface shape of the mold.
前記圧液供給口が前記金型の山部の中央部に到達したとき、前記ロッドの移動を一旦停止し、前記圧液供給口の直上の前記金型の山部の成形を行うことを特徴とする請求項1に記載のバルジ成形方法。   When the pressure liquid supply port reaches the center of the crest of the mold, the movement of the rod is temporarily stopped, and the crest of the mold is formed immediately above the pressure liquid supply port. The bulge forming method according to claim 1. 複数の山部と谷部とが交互に形成された内面形状を有するとともに、内部に素管が配置される金型と、前記素管の内部にその軸線方向に沿って設けられるとともに、圧液供給口を有するロッドと、前記圧液供給口を間にして設けられるとともに、前記素管と前記ロッドの間をシールする1対のシール部とを備え、
前記素管に前記軸線方向の圧縮応力を付与し、前記圧液供給口から前記素管内に圧液を供給しながら、前記ロッドを前記軸線方向に移動させることにより前記素管を前記金型の内面形状に成形するバルジ成形装置において、
成形方向側のシール部に対して前記ロッドから前記素管へ向かう方向に前記圧液の液圧を加えるための液圧印加流路が設けられ、そのシール部が、前記液圧印加流路を通じて加えられた前記圧液の液圧により前記素管の膨出に追従可能とされ、
前記シール部どうしの間隔が、前記金型の内面形状の少なくとも2山分の距離に設定され、
前記成形方向反対側のシール部の前記軸線方向の長さが、前記金型の内面形状の少なくとも1山分の距離に設定されていることを特徴とするバルジ成形装置。
A plurality of crests and troughs have an inner surface shape formed alternately, a mold in which a raw pipe is disposed, and a pressure liquid that is provided along the axial direction inside the raw pipe. A rod having a supply port; and a pair of seal portions that are provided with the pressure liquid supply port interposed therebetween and seal between the raw tube and the rod;
Applying compressive stress in the axial direction to the raw pipe, and supplying the pressurized liquid into the raw pipe from the pressurized liquid supply port, the rod is moved in the axial direction to move the raw pipe to the mold. In the bulge forming device that forms the inner surface shape,
A hydraulic pressure application channel is provided for applying a hydraulic pressure of the pressurized fluid in a direction from the rod toward the raw pipe with respect to the seal portion on the molding direction side, and the seal portion passes through the hydraulic pressure application channel. It is possible to follow the bulging of the raw tube by the hydraulic pressure of the added pressure fluid,
The interval between the seal portions is set to a distance of at least two peaks of the inner surface shape of the mold,
The bulge forming apparatus, wherein a length in the axial direction of the seal portion opposite to the forming direction is set to a distance of at least one mountain of the inner shape of the mold.
前記圧液供給口が前記金型の山部の中央部に到達したとき、前記ロッドの移動を一旦停止し、前記圧液供給口の直上の前記金型の山部の成形を行うことを特徴とする請求項3に記載のバルジ成形装置。   When the pressure liquid supply port reaches the center of the crest of the mold, the movement of the rod is temporarily stopped, and the crest of the mold is formed immediately above the pressure liquid supply port. The bulge forming apparatus according to claim 3.
JP2008062277A 2008-03-12 2008-03-12 Bulge forming method and bulge forming apparatus Expired - Fee Related JP4981718B2 (en)

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