WO2012176326A1 - 無給油型ヘアピンパイプベンダー - Google Patents
無給油型ヘアピンパイプベンダー Download PDFInfo
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- WO2012176326A1 WO2012176326A1 PCT/JP2011/064517 JP2011064517W WO2012176326A1 WO 2012176326 A1 WO2012176326 A1 WO 2012176326A1 JP 2011064517 W JP2011064517 W JP 2011064517W WO 2012176326 A1 WO2012176326 A1 WO 2012176326A1
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- WIPO (PCT)
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- forming roll
- raw material
- material pipe
- hairpin
- pipe material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/02—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers
- B21D53/06—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers of metal tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D7/00—Bending rods, profiles, or tubes
- B21D7/02—Bending rods, profiles, or tubes over a stationary forming member; by use of a swinging forming member or abutment
- B21D7/024—Bending rods, profiles, or tubes over a stationary forming member; by use of a swinging forming member or abutment by a swinging forming member
Definitions
- the present invention relates to a pipe bender (hairpin pipe bender) capable of bending 180 ° with respect to a metal raw material pipe material, and in particular, without supplying lubricating oil to the inside of the raw material pipe material, or a very small amount.
- the present invention relates to a hairpin pipe bender that can be bent 180 ° with respect to a raw material pipe material simply by supplying lubricating oil.
- a hairpin pipe bender 51 having a structure as shown in FIGS. 9 and 10 has been conventionally used. More specifically, the main part of the hairpin pipe bender 51 includes a forming roll 52, a clamp die 53, and a pressure die 54. Among these, the forming roll 52 has, at one end, an arc-shaped portion 52c having a shape corresponding to a bending radius (curvature) to be processed, and from the upper surface 52b through the arc-shaped portion 52c to the lower surface 52d. A continuous groove 52a is formed, and about 180 ° from the position (0 ° position) shown in FIGS.
- the clamp die 53 is configured such that an upper surface 53 b is pressed with a predetermined pressure toward the lower surface 52 d of the forming roll 52 by a pressurizing device (not shown), and is configured to rotate integrally with the forming roll 52. Has been.
- the upper surface 53b of the clamp die 53 is also formed with a groove 53a having a shape corresponding to the outer peripheral surface of the raw material pipe material to be processed.
- the pressure die 54 is for holding one end side of the raw material pipe material when the raw material pipe material is bent, and a groove 54a similar to the groove 53a of the clamp die 53 is formed on the upper surface 54b. Is formed.
- the groove 52a on the lower surface 52d side of the forming roll 52 and the groove 53a of the clamp die 53 are provided.
- the raw material pipe material P is inserted between the two.
- the position of the clamp die 53 is slightly lowered to widen the gap between the forming roll 52 and the clamp die 53 so that the raw material pipe material P can be smoothly inserted into the grooves 52a and 53a.
- the cored bar 55 (mandrel) is inserted from the front end of the raw material pipe material P to an appropriate internal position (a position in the vicinity of the arcuate portion 52c where bending is performed).
- the forming pipe 52 and the clamp die 53 are rotated about the axis A 'as the rotation center, and the raw material pipe material P is bent.
- the forming roll 52 and the clamp die 53 are rotated to the position of about 180 ° (the position shown in FIG. 11 (3))
- the clamp die 53 is opened, and the core metal 55 is pulled out from the raw material pipe material P, and the raw material pipe material P is removed from the forming roll 52 and discharged.
- a U-shaped book-shaped copper pipe bent at 180 ° is widely used as a part for forming a closed pipe line of a refrigerant mounted on an air conditioner or the like.
- a copper tube of a book meat with the conventional hairpin pipe bender 51 as shown in FIG. 11, since the material is very soft, if the 180 ° bending process is performed, distortion or cracking occurs. There is a problem. For example, wrinkles occur in the inner part in the radial direction (bending radius direction), the outer part in the radial direction is crushed, and the cross section that originally had a shape close to a perfect circle is deformed into an irregular shape. There's a problem.
- a force acting in the direction opposite to the arcuate portion 52c may be applied to the distal end portion Pa of the raw material pipe material P during bending.
- the compressive force acting on the radially inner portion is suppressed by the frictional resistance between the distal end portion Pa of the raw material pipe material P and the pressure die 54, thereby avoiding the generation of wrinkles. It is like that. Specifically, when the raw material pipe material P is wound around the outer side of the arc-shaped portion 52 c of the forming roll 52, the tip-side portion Pa of the raw material pipe material P is pressed against the pressure die 54 and the arc-shaped portion 52 c. However, since the pressure die 54 is fixed at this time, the tip end portion Pa of the raw material pipe material P is subjected to the frictional resistance generated between the pressure die 54 and the pressure die 54.
- the cored bar 55 is inserted into the raw material pipe material P as shown in FIG.
- a new frictional resistance is generated between the cored bar 55 and the inner peripheral surface of the raw material pipe material P, and this frictional resistance causes a distortion or a crack in the first half processed portion Pc1.
- the raw material pipe material P is inserted from the end of the inserted metal core 55.
- the lubricating oil is sprayed toward the inner wall.
- the frictional resistance between the cored bar 55 and the inner peripheral surface of the raw material pipe material P is reduced, and distortion and cracks can be suitably prevented.
- the present invention has been made in order to solve the above-described problems, and even when it is intended for a pipe material that is very soft and is prone to distortion such as wrinkles and crushing or cracks. It is an object of the present invention to provide a hairpin pipe bender that can be suitably bent without spraying oil inside or only spraying a very small amount of lubricating oil.
- the present invention has a forming roll having an arc-shaped portion at one end, a clamp die, and a pressure die, and the rear end portion of the raw material pipe material is sandwiched between the forming roll and the clamp die,
- a hairpin pipe bender capable of bending the raw material pipe material by 180 ° by rotating the forming roll and the clamp die around the axis line with the tip side portion of the raw material pipe material being placed on
- the tip of the raw material pipe material is set according to the rotation angle of the forming roll by setting the axis that becomes the rotation center of the forming roll to a position that is shifted at least 0.5 mm from the center of the arc of the arc-shaped portion.
- the size of the frictional resistance between the side portion and the pressure die is changed, and the latter half of the bending process (90 ° to about 1
- the friction resistance acting on the raw material pipe material in the range of 80 ° is configured to be larger than the friction resistance acting on the raw material pipe material in the first half of the bending process (range of 0 ° to 90 °). It is characterized by.
- the axis serving as the rotation center of the forming roll is shifted from the center of the arc of the arcuate portion in a predetermined direction (a direction perpendicular to the longitudinal direction of the forming roll and in the direction of the clamping die).
- a predetermined direction a direction perpendicular to the longitudinal direction of the forming roll and in the direction of the clamping die.
- the first half of the bending process (the forming roll is at the 0 ° position) by setting the position shifted to the center of the forming roll.
- the frictional resistance acting on the raw material pipe material gradually increases, and the latter half of the bending process (the forming roll rotates from the 90 ° position to the approximately 180 ° position). It is preferable that the friction resistance acting on the raw material pipe material is gradually increased to a maximum position and then gradually decreased.
- the present invention provides a hairpin pipe bender capable of bending a raw material pipe material by 180 ° by a base and an upper portion supported in a state of being movable in the horizontal direction on the base.
- the forming roll is rotated to a position of an angle set within a range of 75 ° to 105 °, the upper movement is restricted and stopped, and in the latter half of the bending process, the raw material pipe
- the frictional resistance acting on the material is configured to be larger than the frictional resistance acting on the raw material pipe material in the first half of the bending process.
- the axis that becomes the rotation center of the forming roll by setting the axis that becomes the rotation center of the forming roll to a position that is shifted at least 0.5 mm from the center of the arc of the arcuate portion, according to the rotation angle of the forming roll. It is preferable that the size of the frictional resistance between the tip side portion of the raw material pipe material and the pressure die is changed.
- the axis of rotation of the forming roll is a predetermined direction (the direction perpendicular to the longitudinal direction of the forming roll and the direction on the clamp die side) and / or the forming roll from the center of the arc of the arcuate portion. Is preferably set at a position shifted to the center of the forming roll).
- the hairpin pipe bender according to the present invention can suppress the compressive force acting on the radially inner portion of the raw material pipe material by the frictional resistance acting on the tip side portion of the raw material pipe material in the latter half of the bending process. Since it is possible to suitably avoid the occurrence of wrinkles, and in the first half of the bending process, it is configured so that a resistance force does not act on the raw material pipe material, or only a small frictional resistance force acts, It is possible to prevent thinning and lowering of rigidity in the first half processed portion of the raw material pipe material. As a result, when the second half of the bending process is executed, the second half processed portion is extended with respect to the first half processed portion.
- the spraying of the lubricating oil on the inner peripheral surface of the raw material pipe material can be omitted, or the spray amount of the lubricating oil can be suppressed to a very small amount.
- FIG. 1 is a perspective view of a main part of a hairpin pipe bender 1 according to the first embodiment of the present invention.
- FIG. 2 is a cross-sectional view taken along the line XX of the main part of the hairpin pipe bender 1 shown in FIG.
- FIG. 3 is an explanatory view of a 180 ° bending process by the hairpin pipe bender 1 shown in FIG.
- FIG. 4 is an explanatory diagram of an operation mode (0 ° position) of the forming roll 2 of the hairpin pipe bender according to the second embodiment of the present invention.
- FIG. 5 is an explanatory view of an operation mode (position of 90 °) of the forming roll 2 shown in FIG.
- FIG. 1 is a perspective view of a main part of a hairpin pipe bender 1 according to the first embodiment of the present invention.
- FIG. 2 is a cross-sectional view taken along the line XX of the main part of the hairpin pipe bender 1 shown in FIG.
- FIG. 3 is an explan
- FIG. 6 is an explanatory diagram of the operation mode (position of about 180 °) of the forming roll 2 shown in FIG.
- FIG. 7 is a view showing another configuration example of the forming roll 2 in the hairpin pipe bender according to the second embodiment of the present invention.
- FIG. 8 is a diagram illustrating another configuration example of the forming roll 2 in the hairpin pipe bender according to the second embodiment of the present invention.
- FIG. 9 is a perspective view of a main part of a conventional hairpin pipe bender 51.
- FIG. 10 is a cross-sectional view taken along line YY of the main part of the conventional hairpin pipe bender 51 shown in FIG.
- FIG. 11 is an explanatory diagram of a 180 ° bending process by the conventional hairpin pipe bender 51 shown in FIG. 9.
- FIG. 1 is a perspective view of the main parts (forming roll 2, clamp die 3, and pressure die 4) of the hairpin pipe bender 1 according to the first embodiment of the present invention
- FIG. 2 is shown in FIG. It is sectional drawing by XX.
- the forming roll 2 has an arcuate portion 2c having a shape corresponding to a bending radius and a curvature to be processed at one end, and an arcuate portion from the upper surface 2b.
- a continuous groove 2a passing through 2c and reaching the lower surface 2d is formed.
- the forming roll 2 is configured to rotate about 180 ° from the position shown in FIG. 1 with the axis A as the center of rotation.
- channel 2a becomes a shape corresponding to the outer peripheral surface of the raw material pipe material used as a process target.
- the clamp die 3 is configured so that the upper surface 3b is pressed with a predetermined pressure toward the lower surface 2d of the forming roll 2 by a pressing device (not shown), and is configured to rotate integrally with the forming roll 2.
- a pressing device not shown
- a groove 3 a having a shape corresponding to the outer peripheral surface of the raw material pipe material to be processed is also formed on the upper surface 3 b of the clamp die 3.
- the pressure die 4 is for holding one end of the raw material pipe material from below when the raw material pipe material is bent.
- a groove 6 a similar to the groove 3 a of the clamp die 3 is formed on the upper surface 6 b of the upper portion 6.
- the upper portion 6 is supported on the base 7 via a cross roller guide (not shown) capable of linear movement, and is movable in the horizontal direction (left-right direction in FIG. 2).
- the movement range M of the upper portion 6 (see FIG. 3 (2)) is regulated by a stopper (not shown), and when the forming roll 2 is rotated to the 90 ° position (position shown in FIG. 3 (2)). It comes to stop at. That is, in the first half of the bending process (while the forming roll 2 rotates from the 0 ° position to the 90 ° position), the upper portion 6 is changed from the position shown in FIG. It moves to the position shown in the figure, but stays at the position shown in FIGS. 3 (2) and 3 (3) in the latter half of the bending process (while the forming roll 2 rotates from the 90 ° position to the 180 ° position). It will be.
- the forming roll 2 and the clamp die 3 are rotated upward with the axis A as the center of rotation, and further to the position of about 180 ° shown in FIG. 3 (3).
- the forming roll 2 and the clamp die 3 are rotated to bend the raw material pipe material P.
- the clamp die 3 is opened, the core 5 is pulled out from the raw material pipe material P, and the raw material pipe material P is removed from the forming roll 2 and discharged. To do.
- the forming roll 2 rotates, a portion of the raw material pipe material P that contacts the arc-shaped portion 2c of the forming roll 2 is wound around the arc-shaped portion 2c. In response to this, it is gradually pulled toward the arc-shaped portion 2c. Since the upper portion 6 of the pressure die 4 on which the tip end portion Pa is placed is movable in the horizontal direction on the base 7 in the first half of the bending process as described above, the forming roll While 2 rotates from the position of 0 ° to the position of 90 °, it moves in the same direction together with the tip side portion Pa pulled toward the arcuate portion 2c.
- the resistance force generated between the upper portion 6 and the base 7 when the upper portion 6 moves toward the arc-shaped portion 2c is extremely small. For this reason, in the first half of the bending process, the resistance force by the pressure die 4 hardly acts on the front end side portion Pa pulled toward the arc-shaped portion 2c.
- the radius of the tip end portion Pa is caused by the frictional resistance between the tip end portion Pa of the raw material pipe material P and the pressure die 54 (see FIG. 11) that presses this from the lower side.
- the hairpin pipe bender 1 of the present embodiment also has a conventional hairpin pipe bender in the latter half of the bending process.
- the frictional resistance between the distal end portion Pa of the raw material pipe material P and the upper portion 6 can suppress the compressive force acting on the radially inner portion of the raw material pipe material P, and the generation of soot It can be avoided.
- the resistance force does not act on the raw material pipe material P in the first half of the bending process, so the compressive force acting on the radially inner portion of the tip end portion Pa is not suppressed.
- the wrinkles in the radially inner portion mostly occur in the latter half of the bending process, and the latter half processed portion Pc2 (raw material pipe material shown in FIG. 3 (3)). It can be seen that P occurs in the second half of the bending process, that is, in the portion wound around the outside of the arcuate portion 2c while the forming roll 2 rotates from the 90 ° position to the 180 ° position. Yes.
- the frictional resistance at the time of sliding of the tip side portion Pa of the raw material pipe material P increases the stretching force acting on the radially outer portion, so that the tip side portion in the first half of the bending process.
- the outer side in the radial direction of the first half processed portion Pc1 shown in FIG. 3 (2) becomes thin, and the rigidity decreases accordingly.
- the hairpin pipe bender 1 of the present embodiment as described above, in the first half of the bending process, since it is configured so that the resistance force does not act on the raw material pipe material P, thinning in the first half processed portion Pc1, and As a result, when the second half of the bending process is executed, the stretching force of the second half processed portion Pc2 with respect to the first half processed portion Pc1, the core metal 5 and the raw material pipe material P can be reduced. Even when the frictional resistance with the peripheral surface acts, the occurrence of crushing and cracking can be suitably avoided.
- spraying of the lubricating oil on the inner peripheral surface of the raw material pipe material P can be omitted, or the spray amount of the lubricating oil can be suppressed to a very small amount.
- the upper portion 6 of the pressure die 4 is configured to be stopped by the stopper when the forming roll 2 is rotated to the 90 ° position.
- the rotation angle of 2 is not necessarily limited to 90 °, and is in a range of ⁇ 45 ° (that is, a range of 45 ° to 135 °) depending on conditions such as the material, size, bending radius, etc. of the raw material pipe material P.
- the setting may be appropriately changed within a range of ⁇ 15 ° (ie, a range of 75 to 105 °).
- the hairpin pipe bender of the present embodiment is composed of a forming roll, a clamp die, and a pressure die. With the rear end portion of the raw material pipe material sandwiched between the dies and the front end portion placed on the pressure die, the forming roll and clamp die are positioned at 0 ° with the axis A as the center of rotation. The material pipe material can be bent by 180 ° by being rotated to a position of about 180 °.
- the pressure die is not configured to move in the horizontal direction on the base, and the pressure die of the conventional hairpin pipe bender 51 shown in FIG. Like the pressure die 54, it is in a fixed state.
- the axis A serving as the rotation center of the forming roll 2 is lower than the center C of the arc of the arcuate portion 2c (the rotation of the forming roll 2).
- the hairpin of the first embodiment in that it is set at a position slightly shifted to the lower side, that is, the direction perpendicular to the longitudinal direction of the forming roll 2 and the direction of the clamping die in the state before moving. It is different from Pipe Bender 1.
- the offset dimension B is set to 1.0 mm.
- the reason why the axis A that is the rotation center of the forming roll 2 is shifted from the center C of the arc of the arc-shaped portion 2 c is that the raw material depends on the rotation angle of the forming roll 2. This is because the force of pressing the pipe material against the pressure die is changed, and the magnitude of the frictional resistance between the tip side portion of the raw material pipe material and the groove of the pressure die is changed.
- the forming roll 52 When the forming roll 52 is rotated about the axis A ′ passing through the center of the arc of the arc-shaped portion 52c as in the conventional hairpin pipe bender 51 (see FIGS. 9 to 11), the forming roll 52 is formed. While the roll 52 is rotated from the position of 0 ° to the position of about 180 °, the distance between the forming roll 52 and the pressure die 54 is always constant.
- the forming roll 2 is moved from the 0 ° position.
- the distance between the forming roll 2 and the pressure die gradually decreases, and when rotating from the 90 ° position to the approximately 180 ° position, it becomes even narrower. It will be. Therefore, when the forming roll 2 is rotated from the position of 0 ° to the position of about 180 °, the force by which the material pipe material is pressed against the pressure die according to the rotation angle, and the tip of the material pipe material The magnitude of the frictional resistance between the side part and the pressure die gradually increases.
- the forming roll 2 of this embodiment and the forming roll 52 of the conventional hairpin pipe bender (the forming roll 52 rotates around the axis A ′ passing through the center of the arc of the arc-shaped portion 52c shown in FIG. 9).
- the forming roll 52 rotates around the axis A ′ passing through the center of the arc of the arc-shaped portion 52c shown in FIG. 9).
- the operation modes are compared. 4 to 6 indicate the height position of the deepest portion of the groove of the pressure die.
- the distance between the forming roll 2 and the pressure die (two-dot chain line W) of the present embodiment Becomes wider by the offset dimension B than the distance between the conventional forming roll 52 and the pressure die.
- the distance between the forming roll 2 and the pressure die in this embodiment is the same as the distance between the conventional forming roll 52 and the pressure die.
- the distance between the forming roll 2 and the pressure die of this embodiment is the same as that between the conventional forming roll 52 and the pressure die. It becomes narrower by the offset dimension B (see FIG. 4) than the interval.
- the hairpin pipe bender of the present embodiment when the 180 ° bending process is performed by the hairpin pipe bender of the present embodiment, in the first half of the bending process (in the range from 0 ° to 90 °), the force for pressing the raw material pipe material against the pressure die, and The frictional resistance between the tip portion of the raw material pipe material and the pressure die is smaller than that of the conventional forming roll 52, and the pressing force acting on the raw material pipe material in the second half of the bending process (range of 90 ° to about 180 °) In addition, the frictional resistance is larger than that of the conventional forming roll 52.
- a large frictional resistance acts on the tip side portion of the raw material pipe material in the latter half of the bending process, and the latter half processed portion Pc2 of the raw material pipe material (FIG. 3).
- the compressive force acting on the inner side in the radial direction can be suppressed, and the generation of wrinkles can be avoided.
- the resistance acting on the raw material pipe material becomes small, and therefore, it is possible to prevent the thinning and the rigidity of the first half processed portion Pc1 (see FIG. 3 (2)) from being reduced.
- the stretching force of the second half processed portion Pc2 and the frictional resistance between the core metal and the inner peripheral surface of the raw material pipe material act on the first half processed portion Pc1.
- the occurrence of crushing and cracking can be suitably avoided. That is, also in the hairpin pipe bender of this embodiment, the spray of the lubricating oil with respect to the inner peripheral surface of the raw material pipe material can be omitted, or the spray amount of the lubricating oil can be suppressed to a very small amount.
- the offset dimension B of the axis A serving as the rotation center of the forming roll 2 (the amount of deviation from the arc center C of the arc-shaped portion 2c) is set to 1.0 mm.
- the magnitude of frictional resistance acting on the tip side part of the raw material pipe material and the mode of change depend on conditions such as the material pipe material to be processed, dimensions, bending radius, etc. Can be adjusted accordingly.
- the axis A that is the rotation center of the forming roll 2 is shifted only downward (downward in FIG. 4) (on the clamp die side) from the center C of the arc of the arcuate portion 2c.
- the forming roll 2 can be made to have the largest frictional resistance when it is rotated to a position of 90 °, and as shown in FIG. 8, the direction is 45 ° downward to the right from the center C of the arc of the arcuate portion 2c.
- the frictional resistance acting on the raw material pipe material gradually increases, and the second half of the bending process (90 ° to about 180 °).
- the range (1) it is possible to perform bending so that the frictional resistance acting on the raw material pipe material gradually increases to a position of 135 ° where the frictional resistance is maximized, and then gradually decreases.
- the appropriate offset dimension B of the axis A (the amount of deviation from the arc center C of the arc-shaped portion 2c) is calculated for each of the longitudinal direction of the forming roll 2 and the direction orthogonal thereto, and the position of the axis A is determined. It is desirable to decide.
- the pressure die 4 of the first embodiment which is configured so that the upper part 6 can move within a predetermined range in the horizontal direction on the base 7, is applied to the hairpin pipe bender 1 of the second embodiment, and the upper part
- the movement range M of 6 the rotation angle of the forming roll 2 where the upper part 6 stops or the stop position of the upper part 6
- the resistance force acting on the raw material pipe material is bent. It is possible to realize a bending process that changes in a more complicated manner during the process (while the forming roll 2 rotates from a position of 0 ° to a position of about 180 °).
- the upper part 6 is configured to stop when the forming roll 2 is rotated to a position of 45 °, and the upper part 6 is used as the raw material while the forming roll 2 is rotated from the position of 0 ° to the position of 45 °.
- the raw material pipe material P is bent with almost no resistance force, from a 45 ° position to a 135 ° position.
- the frictional resistance acting on the material pipe material P gradually increases, and when rotating from a position of 135 ° to a position of about 180 °, the frictional resistance decreases little by little. It is possible to execute the bending process in such a manner as to do.
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Abstract
Description
2,52:フォーミングロール、
2a,52a:溝、
2b,52b:上面、
2c,52c:円弧状部、
2d,52d:下面、
3,53:クランプダイ、
3a,53a:溝、
3b,53b:上面、
4,54:プレッシャーダイ、
5,55:芯金、
6:上部、
6a:溝、
6b:上面、
7:ベース、
54a:溝、
54b:上面、
A,A’:軸線、
C:円弧の中心、
P:原料パイプ材、
Pa:先端側部分、
Pb:後端側部分、
Pc1:前半加工部分、
Pc2:後半加工部分
Claims (7)
- 一端に円弧状部を有するフォーミングロールと、クランプダイと、プレッシャーダイとを有し、フォーミングロールとクランプダイの間に原料パイプ材の後端側部分を挟持させ、プレッシャーダイの上に原料パイプ材の先端側部分を載置させた状態で、フォーミングロール及びクランプダイを、軸線周りに回動させることにより、原料パイプ材に180°の曲げ加工を施すことができるヘアピンパイプベンダーにおいて、
フォーミングロールの回動中心となる軸線を、円弧状部の円弧の中心から、少なくとも0.5mm以上ずれた位置に設定することにより、フォーミングロールの回動角度に応じて、原料パイプ材の先端側部分とプレッシャーダイとの摩擦抵抗の大きさが変化するように構成され、
曲げ工程の後半において原料パイプ材に作用する摩擦抵抗が、曲げ工程の前半において原料パイプ材に作用する摩擦抵抗よりも大きくなるように構成されていることを特徴とするヘアピンパイプベンダー。 - フォーミングロールの回動中心となる軸線を、円弧状部の円弧の中心から、フォーミングロールの長手方向と直交する方向であって、クランプダイ側の方向へずれた位置に設定することにより、フォーミングロールを0°の位置から約180°の位置まで回動させる際、原料パイプ材に作用する摩擦抵抗が次第に大きくなっていくように構成されていることを特徴とする、請求項1に記載のヘアピンパイプベンダー。
- フォーミングロールの回動中心となる軸線を、円弧状部の円弧の中心から、フォーミングロールの長手方向と直交する方向であって、クランプダイ側の方向、及び、フォーミングロールの長手方向であって、フォーミングロールの中心側の方向へずれた位置に設定することにより、曲げ工程の前半においては、原料パイプ材に作用する摩擦抵抗が次第に大きくなっていき、曲げ工程の後半においては、原料パイプ材に作用する摩擦抵抗が、最大となる位置まで次第に大きくなっていき、その後、次第に小さくなっていくように構成されていることを特徴とする、請求項1に記載のヘアピンパイプベンダー。
- 一端に円弧状部を有するフォーミングロールと、クランプダイと、プレッシャーダイとを有し、フォーミングロールとクランプダイの間に原料パイプ材の後端側部分を挟持させ、プレッシャーダイの上に原料パイプ材の先端側部分を載置させた状態で、フォーミングロール及びクランプダイを、軸線周りに回動させることにより、原料パイプ材に180°の曲げ加工を施すことができるヘアピンパイプベンダーにおいて、
プレッシャーダイが、ベースと、このベース上において水平方向へ移動可能な状態で支持された上部とによって構成され、
フォーミングロールが、75°~105°の範囲内において設定された角度の位置まで回動した時点で、上部の移動が規制され、停止するように構成され、
曲げ工程の後半において原料パイプ材に作用する摩擦抵抗が、曲げ工程の前半において原料パイプ材に作用する摩擦抵抗よりも大きくなるように構成されていることを特徴とするヘアピンパイプベンダー。 - フォーミングロールの回動中心となる軸線を、円弧状部の円弧の中心から、少なくとも0.5mm以上ずれた位置に設定することにより、フォーミングロールの回動角度に応じて、原料パイプ材の先端側部分とプレッシャーダイとの摩擦抵抗の大きさが変化するように構成されていることを特徴とする、請求項4に記載のヘアピンパイプベンダー。
- フォーミングロールの回動中心となる軸線が、円弧状部の円弧の中心から、フォーミングロールの長手方向と直交する方向であって、クランプダイ側の方向へずれた位置に設定されていることを特徴とする、請求項5に記載のヘアピンパイプベンダー。
- フォーミングロールの回動中心となる軸線が、円弧状部の円弧の中心から、フォーミングロールの長手方向と直交する方向であって、クランプダイ側の方向、及び、フォーミングロールの長手方向であって、フォーミングロールの中心側の方向へずれた位置に設定されていることを特徴とする、請求項5に記載のヘアピンパイプベンダー。
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JP2005161342A (ja) * | 2003-12-01 | 2005-06-23 | Toyota Motor Corp | 管材の引き曲げ加工条件算出方法及び装置並びに管材の引き曲げ加工方法及び装置 |
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