JP4509984B2 - Neck processing equipment for pipe material - Google Patents

Description

  The present invention relates to a constriction processing apparatus and a constriction processing method for constricting a pipe material, and particularly to a constriction processing apparatus and a constriction processing method for a pipe material suitable for constriction processing of a pipe material used for a superconducting acceleration cavity.

  Currently, superconducting accelerating cavities for linear colliders (electron and positron accelerators) are being developed. In the linear collider, a niobium (Nb) cavity with a resonance frequency of 1.3 GHz is operated in a superconducting state cooled with liquid helium to an absolute temperature of 2 degrees (2K), and an on-axis electric field of 35 MV / m to 45 MV / m is generated. The electron (or positron) beam is accelerated. In the ILC (International Linear Collider Project), 4 to 8 superconducting accelerating cavities (cavities) are arranged in series in a device called cryostad, and 5000 to 2500 are connected in series to form a linear shape of about 30 to 40 km. It is planned to build a cavity.

  FIG. 9 is a front view of a superconducting acceleration cavity composed of nine multi-cells. The superconducting accelerating cavity does not have a monotonous cavity shape inside, but each cell has a constriction called iris for accelerating particles. As a method of manufacturing a superconducting accelerating cavity composed of multiple cells, niobium sheet metal is formed into a half cell by press working, and the half cell group is joined back to back by electron beam welding to form a dumbbell shape. An electron beam method for joining the two by electron beam welding has been established in the art.

  However, the electron beam method has a problem that a bead due to electron beam welding remains in the equator portion (cavity maximum diameter portion) of the completed superconducting acceleration cavity. If the bead is formed in the direction perpendicular to the electric field direction in the equator portion of the superconducting acceleration cavity, it will be a major cause of the deterioration of the cavity performance. For this reason, the electron beam method has a problem that a process of smoothly polishing the beads is required and the welding time is increased.

  Therefore, a method for forming a seamless pipe seamless in both the circumferential direction and the axial direction has been proposed. For example, a manufacturing method has been proposed in which a plurality of press working, deep drawing processing, stretch forming processing, hydraulic bulging processing, and spinning processing are appropriately combined (see, for example, Patent Document 1). The manufacturing method described in Patent Document 1 collects a disk by cutting from a clad plate, and forms it into a cup-shaped cylinder by deep drawing several times. A single cell having an equator portion is produced.

In addition, a method of manufacturing a seamless cavity by bulge processing using a small number of molds has been proposed (for example, see Patent Document 2). In Patent Document 2, a single cell is formed from a cylinder by bulge processing using a pair of split molds that are split at a position corresponding to the maximum diameter portion of the cavity.
JP 2000-367799 A JP 2001-196200 A

  As a method of manufacturing a superconducting acceleration cavity composed of multiple cells, the present inventors have continuously formed constrictions by drawing at a plurality of positions (iris portions) in the pipe material, and then bulgeed to form the equator of the cell. It was thought that if multiple cells were formed at a time by giving a bulge to the area corresponding to, the time could be greatly reduced compared to the method of obtaining single cell cavities one by one.

  However, when the pipe material is clamped to the main shaft of the drawing machine (lathe) with the existing clamping method, and the main shaft is driven to rotate, the pressing roller is pressed to continuously form the constriction at multiple positions of the pipe material. The following problems occurred. That is, since resistance is received at the drawing point to be drawn, it is difficult to obtain a desired shape, for example, the pipe is twisted and the pipe is swelled.

  In addition, even if the necking of the desired shape was successfully formed by drawing, there was a problem that when trying to draw another neck next to it, the neck that had already been processed was distorted during the necking. .

  An object of the present invention is to provide a constriction processing apparatus and constriction processing method for a pipe material that can continuously form a constriction of a desired shape in a pipe material by drawing.

The pipe material constriction processing apparatus of the present invention is arranged so that a pipe material to be a workpiece is attached and rotated, and a pipe material attached to the main shaft is opposed to each other in a radial direction, and the pipe material is disposed on a pipe central axis. A pair of generating rollers that are pushed into the side to give a constriction, an X-axis feed mechanism that moves the generating rollers by the same amount in the pipe central axis side or the opposite direction in the radial direction of the pipe material, the generating rollers, A Z-axis feed mechanism that integrally moves the X-axis feed mechanism in the pipe axis direction and a pipe material that is disposed on both sides in the pipe axis direction across the processing point of the pipe material by the generating roller, and clamps the pipe material from the outer periphery. a pair of clamping mechanisms, the comprises a support frame for rotatably supporting the respective clamping mechanisms, the rotational force of the main shaft is disposed parallel to the main shaft is reversed Rotation drive shaft transmitted by each other, a clamp mechanism side gear provided on the outer periphery of each clamp mechanism, and a corresponding clamp mechanism side gear provided at a position facing each clamp mechanism side gear on the rotation drive shaft. And a pair of gear trains that are in mesh with the rotation drive shaft side gear, and the support frame rotatably supports the rotation drive shaft in a region facing each clamp mechanism .

According to the pipe material constriction processing apparatus configured as described above, the pipe material is clamped and rotated from the outer periphery by the pair of clamp mechanisms arranged on both sides in the pipe axial direction across the processing point of the pipe material. In addition, as a result of the generating roller being pressed against the pipe material by two axes, the radial direction and the pipe axis direction, by the X-axis feed mechanism and the Z-axis feed mechanism, the occurrence of burrs at the boundary between the constricted portion and the pipe diameter portion can be suppressed. In addition, the problem of distortion in the processed constriction has also been eliminated. Further, according to the constriction processing apparatus for a pipe material configured as described above, the clamp mechanism and the rotation drive shaft are rotatably held by the support frame, so that the processing points of the pipe material can be reduced without adversely affecting the main shaft. Clamp mechanisms can be provided on both sides. Moreover, since the rotational force in the same rotational direction is given from the rotational drive shaft to the clamp mechanism via the gear train, sufficient rotational force can be secured, stable squeezing can be realized, and resistance is received at the processing point for drawing. In this case, the pipe is not twisted, and the problem that the pipe rises is suppressed.

  Further, according to the present invention, in the above-described necking device for pipe material, the feed in the radial direction of the generating roller and the feed in the pipe axis direction by the X-axis feed mechanism and the Z-axis feed mechanism are controlled biaxially from the NC lathe controller. It is characterized by that.

  According to the constriction processing apparatus for a pipe material configured in this way, since the generating roller is controlled by the biaxial NC, a free indentation curved surface can be obtained, and at the boundary between the constricted portion and the pipe diameter portion. Generation of burr can be suppressed.

  It is desirable that the clamp mechanism is a collet chuck. Further, the pipe material is made of a composite material in which the inner layer is niobium (Nb) and the outer layer is copper (Cu), or the inner layer is copper (Cu), the intermediate layer is niobium (Nb), and the outer layer is copper (Cu). Can be used.

  According to the present invention, a constriction having a desired shape can be continuously formed in a pipe material by drawing, and the manufacturing time of a seamless multi-cell superconducting acceleration cavity can be greatly reduced.

Hereinafter, an embodiment of the present invention will be specifically described with reference to the drawings.
FIG. 1 is a front view of a drawing apparatus according to an embodiment to which the present invention is applied, and FIG. 2 is a top view of the drawing apparatus. Each drawing is a partial cross-sectional view except for a mother machine and a lathe bed. Yes.
A lathe bed 11 is connected horizontally from one side surface of the base machine (lathe) 10, and a main shaft 12 and a rotary drive shaft 13 extending from the base machine 10 are arranged in parallel above the lathe bed 11. The base end portion of the main shaft 12 is connected to a drive source inside the mother machine 10, and the main shaft 12 and the rotary drive shaft 13 are connected via a gear mechanism 14 described later.

  The left fixed block 15 and the right fixed block 16 are attached and fixed to the lathe bed 11 with fasteners such as screws at two predetermined positions on the upper surface of the lathe bed 11. The left fixed block 15 is formed with a through hole through which the pipe material P attached to the main shaft 12 can pass, and a casing 17 is fixedly attached to a side wall facing the right fixed block 16.

  The right fixed block 16 is configured in the same manner as the left fixed block 15, has a through-hole through which the pipe material P attached to the main shaft 12 can pass, and has a casing 18 on a side wall facing the left fixed block 15. Is fixed.

  The casings 17 and 18 incorporate left and right collet chucks for fixing the outer periphery of the pipe material P on both sides of the machining point, and gears provided on the outer periphery of the left and right collet chucks and a gear provided on the rotary drive shaft 13. A gear train that is connected to each other is incorporated. The structure of the left and right collet chucks and the gear train will be described later.

  As shown in FIG. 2, a Z-axis stage 19 that slides in the Z-axis direction that is the axial direction of the main shaft 12 is placed between the left and right fixed blocks 15 and 16. An axis feeding device 21 in the Z-axis direction is installed at the end of the lathe bed 11 on the opposite side to the mother machine 10. A feed screw 22 that is rotationally driven by the shaft feeding device 21 extends in the Z-axis direction, and is screwed to a part of the Z-axis stage 19 so as to be capable of shaft feeding. Therefore, the shaft feeding device 21 can rotationally drive the feed screw 22 clockwise or counterclockwise to feed the Z-axis stage 19 leftward or rightward in the drawing.

  Two guide rails 23 a and 23 b are arranged on the upper surface of the Z-axis stage 19 in the X-axis direction orthogonal to the Z-axis direction. A pair of X-axis stages 24 and 25 are mounted on the Z-axis stage 19 so as to be slidable on the guide rails 23a and 23b in the X-axis direction. An axis feeding device 26 in the X-axis direction is installed at the end of the Z-axis stage 19 in the X-axis direction. A feed screw 27 that is rotationally driven by the shaft feeding device 26 extends in the X-axis direction, and is screwed to the pair of X-axis stages 24 and 25 so as to be capable of axial feeding. In the feed screw 27, the thread groove is reversed between the threaded portion of one X-axis stage 24 and the threaded portion of the other X-axis stage 25. For example, when rotated clockwise, the pair of X-axis stages 24, A pair of X-axis stages 24 and 25 are configured to move away from each other by the same distance when they are moved closer to each other by the same distance and rotated counterclockwise.

  The Z-axis direction axis feeding device 21 and the X-axis direction axis feeding device 26 are constituted by servo motors, for example, and the axis feed amount and timing are controlled biaxially by the NC lathe control device 28. It is assumed that the pipe material P is constricted in a desired shape by a two-axis (Z-axis and X-axis) control method by the NC lathe control device 28. In the NC lathe control device 28, constriction shape information to be given to the pipe material P is registered in advance in a numerical data format.

  As shown in FIG. 3, a mounting plate 31 is fixed to the end surface of the mother machine 10 into which the base end portion of the main shaft 12 is inserted. The mounting plate 31 is provided with a through hole at a position where the main shaft 12 penetrates, and a housing 32 for holding the shaft end of the rotary drive shaft 13 is provided at the top.

  A main shaft side gear 33 fixed to the outer periphery of the main shaft 12 is disposed so as to be adjacent to the mounting plate 31. The main shaft side gear 33 is concentrically fixed to the outer periphery of the rotary drive shaft 13 and meshes with the rotary drive shaft side gear 34 housed in the housing 32. The housing 32 holds the shaft end portion of the rotary drive shaft 13 via bearings 35 so as to be rotatable at two locations in the axial direction. Accordingly, the rotation of the main shaft 12 is transmitted to the rotary drive shaft 13 through the gear mechanism 14 (33, 34), and the main shaft 12 and the rotary drive shaft 13 are configured to rotate in reverse at the same rotational speed in synchronization. Yes.

  The left fixed block 15 forms a hollow cube body, and through-holes 15a and 15b larger than the diameter of the pipe material P are formed in the central portion where the main shaft 12 passes through substantially the center. In the left fixed block 15, one side surface of the casing 17 is attached and fixed to the side wall on the through-hole 15b side.

  The lower portion (main shaft side) of the casing 17 is formed with a through hole in a region through which the main shaft 12 passes, and a left collet chuck 36 is provided in the through port portion. A collet chuck side gear 37 is concentrically fixed to the outer periphery of the left collet chuck 36. On the other hand, the upper portion (rotation drive shaft side) of the casing 17 has a through hole formed in a region through which the rotation drive shaft 13 passes, and is concentrically fixed to the outer periphery of the rotation drive shaft 13 in the through hole portion. A rotary drive shaft side gear 38 is accommodated. In the casing 17, the collet chuck side gear 37 and the rotational drive shaft side gear 38 are engaged with each other, and the left collet chuck 36 rotates in the rotational direction of the main shaft 12 at the same rotational speed as the main shaft 12 from the rotational drive shaft 13 side. It is comprised so that force may act.

  The right fixed block 16 forms a hollow cube body, and through-holes 16a and 16b larger than the diameter of the pipe material P are formed in the central part where the main shaft 12 passes through substantially the center. In the right fixed block 16, one side surface of the casing 18 is attached and fixed to the side wall on the through-hole 16b side.

  In the lower part of the casing 18, a through hole is formed in a region through which the main shaft 12 passes, and a right collet chuck 39 is provided in the through hole portion. A right collet chuck side gear 40 is concentrically fixed to the outer periphery of the right collet chuck 39. On the other hand, the upper portion of the casing 18 is formed with a through hole in a region through which the rotary drive shaft 13 passes, and the rotary drive shaft side gear 41 fixed concentrically to the outer periphery of the rotary drive shaft 13 in the through port portion. Is stored and arranged. In the casing 18, the right collet chuck side gear 40 and the rotation drive shaft side gear 41 are engaged with each other, and the right collet chuck 39 is rotated from the rotation drive shaft 13 side in the rotation direction of the main shaft 12 at the same rotational speed as the main shaft 12. Force to act.

  In the present embodiment, since the middle of the left collet chuck 36 and the right collet chuck 39 is a machining point, the pipe material P is fixed to the main shaft 12 (with the left collet chuck 36 and the right collet chuck 39 fixed on the left and right of the machining point. Since it is rotated together with the workpiece, an extremely stable rotation operation can be obtained during machining.

Here, a specific configuration of the left and right collet chucks 36 and 39 will be described in detail.
FIG. 4 is a cross-sectional view showing the configuration of the left and right collet chucks 36 and 39. As shown in the figure, a collet 43 whose opening edges are cracked at a plurality of locations in the circumferential direction is integrally formed or connected and fixed to one end of a cylindrical member 42 having a diameter slightly larger than the workpiece diameter. The cylindrical adapter member 44 is slidably fitted on the outer periphery of the cylindrical member 42, and the contact surface of the pressing member 44a provided at the distal end portion of the adapter member 44 is pressed into contact with the tapered surface 43a of the outer peripheral end portion of the collet 43. It has become. Pushing bases 45 having screw holes are provided at a plurality of locations (for example, four locations) in the circumferential direction on the outer periphery of the other end of the cylindrical member 42. The tip of the screw member 46 screwed into the screw hole of the push-in table 45 is pressed against the rear end of the adapter member 42, and the screw member 46 is screwed so that the collet 43 holds the workpiece and retracts the screw member 46. Thus, the collet 43 can be loosened. The adapter member 44 fixed to the pipe material P via the collet 43 rotates together with the pipe material P as the main shaft 12 rotates. Therefore, the outer peripheral portion of the adapter member 44 that forms the outer peripheral surface of the left collet chuck 36 is rotatably held in the casing via the ball bearings 47, 48, and 49 at a plurality of locations (three locations).

  The right collet chuck 39 is configured in the same manner as the left collet chuck 36. That is, the cylindrical member 52, the collet 53, the adapter member 54, the pushing base 55, the screw member 56, and the ball bearings 57, 58, 59 are combined as shown in the figure.

  FIG. 5 is a partial cross-sectional view showing a setting state of the pipe material P which is a workpiece. The pipe material P shown in the figure shows a state after constriction is formed at five locations. It is assumed that the pipe material P before the constriction processing is a seamless pipe having a cylindrical shape having a certain diameter.

  A pipe guide member 61 is fitted into and fixed to the through hole 15a formed in the left fixed block 15. The pipe guide member 61 has an inner diameter slightly larger than the outer shape of the pipe material P serving as a workpiece, and holds the pipe material P inserted into the through-hole 15a of the left fixed block 15 so as to be slidable without backlash. It has become. A pipe guide member 62 is also provided in the through hole 16a formed in the right fixed block 16 to hold the pipe material P inserted into the through hole 16a slidably without backlash.

  Although the pipe material P is set to the main shaft 12 in advance in a structure to be described later, a fixing ring 63 is fixed in the vicinity of the end of the pipe material P set on the main shaft 12 and the movable member 64 slides. It is attached freely. A plurality of disc springs 65 are provided between the fixed ring 63 and the movable member 64. On the other hand, an engaging member 66 is attached to the end of the pipe material P on the mother machine side. The engaging member 66 has a substantially cylindrical shape, one end opening is set to a diameter through which the disc spring 65 can pass, and the other end opening is set to a diameter smaller than the flange diameter of the movable member 64. The pipe material P is set on the main shaft 12 in a state where the disc spring 65 is pushed into the mother machine side by the flange of the movable member 64 and tightened, and the pipe material P itself may be extended or contracted by drawing. However, while the disc spring 65 restricts the extension of the pipe material P itself, it has a structure capable of absorbing the shrinkage. When the pipe material P is pushed to the mother machine side, the disc spring 65 contracts to generate a force (elastic force) that pushes the movable member 64, and the engagement member 66 receives the elastic force and pushes the pipe material P back to the opposite end side. To be transferred to the pipe material P.

  A fixed ring 73 is provided in the vicinity of the other end of the pipe material P set on the main shaft 12, and a movable member 74 is provided closer to the center of the pipe material P than the fixed ring 73. An engaging member 75 is attached to the end opening of the pipe material P in the same manner as described above. The flange of the movable member 74 is engaged with the opening edge of the engaging member 75 on the fixed ring 73 side.

  Therefore, as shown in FIG. 5, the fixed ring 73 is attached to the main shaft 12 in such a manner that the movable member 74 engaged with the opening edge of the one end portion of the pipe material P is pressed into the mother machine side with a predetermined pressing force and the disc spring 65 is compressed. By fixing, the pipe material P can be fixed to the main shaft 12.

  FIG. 6 is a plan view of the X-axis stage portion, and the left and right fixed blocks, the casing, and the collet chuck portion are cross-sectional views cut horizontally at the main shaft 12 portion. FIG. 7 is a side view of the X-axis stage as viewed from the axis feeding device (X-axis) 26 side. The feed screw portion and the Z-axis stage of the X-axis stage are sectional views cut horizontally at the feed screw portion.

  In FIG. 6, a rear generating roller 71 is mounted and fixed on the rear X-axis stage 24 with its rotational axis parallel to the main shaft 12. Further, in FIG. 6, a front generating roller 72 is mounted and fixed on the front X-axis stage 25 with its rotating shaft parallel to the main shaft 12. The generating rollers 71 and 72 are arranged on the axis of the feed screw 27.

  As shown in FIG. 7, an axis feeding device (X axis) 26 is attached and fixed to the Z axis stage 19. A feed screw 27 connected to the rotation shaft of the shaft feeding device (X-axis) 26 is fixed to a bearing at the end of the Z-axis stage that passes through the lower portions of the X-axis stages 24 and 25 and faces each other. At the lower part of the X-axis stages 24 and 25 through which the feed screw 27 penetrates, threaded portions that are screwed into thread grooves formed on the outer peripheral surface of the feed screw 27 are formed. In the feed screw 27, a left screw 27a is formed at a portion to be screwed with a screw portion of one X-axis stage 24, and a right screw is at a portion to be screwed with a screw portion of the other X-axis stage 25. A screw 27b is formed.

  Next, the operation of the drawing apparatus according to the present embodiment configured as described above will be described. In this example, an Nb material and a copper clad pipe material suitable for manufacturing a superconducting acceleration cavity are used as the pipe material P. For example, the inner layer is made of niobium (Nb) and the outer layer is made of copper (Cu), or the inner layer is made of copper (Cu), the intermediate layer is made of niobium (Nb), and the outer layer is made of a composite material of copper (Cu). A plurality of (for example, 5 to 9) constrictions are drawn into the cylindrical pipe material P.

  In this embodiment, both the X-axis and Z-axis feed rates are set to 2 to 800 mm / min, and the X-axis stroke is set to around 125 mm. The maximum roller pushing force by the rear generating roller 71 and the front generating roller 72 was 2 tons. The workpiece rotation speed is set to 800 rpm at the maximum and is set on the mother machine side. The workpiece specification was an outer diameter of 100 mm to 150 mm, the maximum length was 2120 mm, and the maximum pushing amount in the radial direction was 50 mm.

  First, the unprocessed pipe material P (the pipe material P shown in FIG. 5 is in a state after processing the constriction in five places) is set on the main shaft 12. In FIG. 5, the right end portion of the pipe material P is restricted from moving in the right direction in the drawing by the fixing ring 73 via the engaging member 75 and the movable member 74. Further, the left end portion of the pipe material P is pressed and held to the right in the drawing by the elastic force of the disc spring 65. As a result, the pipe material P is slightly reduced in the pipe axial direction during constriction, but the length change can be absorbed by the disc spring 65 and follows the axial expansion and contraction during workpiece machining. Can always maintain a sufficient holding force.

  Next, the main shaft 12 is moved in the axial direction (Z-axis direction) in a state where the rear generating roller 71 and the front generating roller 72 are retracted from the pipe material P, and the first necking processing position in the pipe material P is processed. The point is positioned so that the rear generating roller 71 and the front generating roller 72 are in the opposite pushing positions.

  At this time, the left and right collet chucks 36 and 39 are disposed on both sides in the pipe axial direction of the processing points by the rear generation roller 71 and the front generation roller 72. The screw members 45 and 56 are screwed in the tightening direction of the collets 43 and 53 at a plurality of positions in the circumferential direction in the left and right collet chucks 36 and 39. As a result, the collets 43 and 53 uniformly clamp both sides of the processing point of the pipe material P, and the pipe material P is attached to the left and right fixed blocks 15 and 16 via the casings 17 and 18 that rotatably hold the collet chucks 36 and 39. It will be held.

  Next, the mother machine 10 rotates the main shaft 12 at a constant speed. The rotation of the main shaft 12 is transmitted to the rotary drive shaft 13 via the gear mechanism 14, and the main shaft 12 and the rotary drive shaft 13 rotate at the same rotational speed in synchronization. The pipe material P fastened and fixed to the main shaft 12 by the left and right collet chucks 36 and 39 rotates around the main shaft 12 as a rotation axis.

  At this time, the left and right collet chuck side gears 37, 40 provided on the collet chucks 36, 39 mesh with the rotation drive shaft side gears 38, 41, and the rotation drive shaft side gears 38, 41 connect the rotation drive shaft 13. The rotating shaft rotates in the opposite direction to the main shaft 12. Therefore, the left and right collet chuck side gears 37 and 40 are rotated by receiving the rotational force from the main shaft 12 and are also rotated by receiving the synchronized rotational driving force from the rotational drive shaft 13 side.

  In the state where the pipe material P is clamped by the left and right collet chucks 36 and 39 on both sides in the pipe axial direction of the pipe material P and the pipe material P is rotated at a predetermined speed, the rear generating roller 71 and the front generating roller with respect to the processing point 72 is pressed from the front and back to perform drawing. The rear generating roller 71 and the front generating roller 72 are controlled by the NC lathe control device 28 in two directions: radial feed (X axis) and pipe axial feed (Z axis). When the feed screw 27 is rotated by the shaft feeding device (X axis) 26, the X axis stages 24 and 25 are moved by the same amount in the workpiece center side or in the opposite direction. If the X-axis stages 24 and 25 are moved toward the workpiece center, the rear creation roller 71 and the front creation roller 72 are moved toward the workpiece center and pressed against the pipe machining point with a predetermined pushing force to perform drawing. Is called. Further, when the feed screw 22 is rotated by the shaft feeding device (Z-axis) 21, the Z-axis stage 19 moves in the pipe axis direction. If the Z-axis stage 19 is moved in the pipe axial direction, the throttle positions of the rear generating roller 71 and the front generating roller 72 in the pipe axial direction change. By combining the X-axis feed and the Z-axis feed, the inclination of the constricted portion with respect to the pipe material P can be formed. In this embodiment, radial feed (X-axis) and pipe axial feed (Z-axis) are controlled biaxially by the NC lathe controller 28, and the rear generating roller 71 and the front generating roller 72 are biaxial. Since it can be moved by the NC, it is possible to obtain an indented curved surface that is free in the plane, and a work creation profile as shown in FIG. 8 can be obtained.

  For example, the rear generating roller 71 and the front generating roller 72 are first pushed in from the front and rear portions with respect to the constriction center position in the pipe axis direction, and then pulled back to the original position. Next, the rear generating roller 71 and the front generating roller 72 are moved by a predetermined amount in the Z-axis direction (for example, leftward movement), and then moved in the Z-axis direction (rightward movement) while moving in the push-in direction to the center position of the neck. When it reaches, the Z-axis movement is stopped and pulled back to the original position in the X-axis direction. Similarly, after the rear generating roller 71 and the front generating roller 72 are moved by the same distance in the Z-axis direction (rightward movement) from the center of the constriction, the Z-axis movement (leftward movement is performed while moving the X-axis by the same distance in the pushing direction. ) When the constricted center position is reached, the Z-axis movement is stopped and pulled back to the original position in the X-axis direction. Such biaxial control is repeated symmetrically around the center of the constriction while gradually increasing the movement distance in the Z-axis direction (left-right movement) and the movement distance in the X-axis direction.

  When the necking process is successfully performed at one position, the clamps by the left and right collet chucks 36 and 39 are released, the main shaft 12 is moved by a predetermined amount in the Z-axis direction, and the rear generating roller 71 and the front generating roller 72 are adjacent to each other. It positions so that it may be located in the processing point which is. Thereafter, the outer periphery of the pipe material P is clamped again on both sides adjacent to the machining point by the left and right collet chucks 36, 39, and the necking is performed at the machining point in the same manner as described above. At this time, as shown in FIG. 5, the left and right collet chucks 36 and 39 clamp the pipe diameter portion adjacent to the successful constricted portion, so that the pipe material P is held on both sides with a required clamping force without deforming the constricted portion. It can be clamped from.

  In previous experiments, the pipe material was clamped only on one side of the base machine side, and the roller was pushed in from only one side in the X-axis direction to perform the constriction processing. As a result, the burr ( In addition, when the adjacent constriction was processed, the shape of the already processed constriction was distorted, and the correct shape could not be maintained.

  As described above, when the pipe material P subjected to the constriction processing was verified for the change in the thickness of the pipe after the drawing, it was confirmed that the pipe material P had reproducibility within a range of 0.1 mm.

  In this embodiment, both sides of the processing point are clamped by the left and right collet chucks 36, 39, and the rear generating roller 71 and the front generating roller 72 are pushed in from the front and rear to perform the narrowing process. Succeeded in suppressing the occurrence of burrs at the boundary with the part, and also solved the problem of distortion in the processed neck.

  Further, in this embodiment, since the rear generating roller 71 and the front generating roller 72 are biaxially controlled by the NC, a free pressing curved surface can be obtained, and at the boundary between the constricted portion and the pipe diameter portion. Generation of burrs can be suppressed.

  In the above description, the case where the pipe material used for the superconducting accelerating cavity is constricted is explained, but in addition to this, in the manufacturing field of automobile parts, general machinery, ornaments, etc., a plurality of constrictions are continuously formed on the pipe material. The present invention can be applied if there is an application to be given.

  In the above description, the rotation drive shaft side gears 38 and 41 of the rotation drive shaft 13 are engaged with the collet chuck side gears 37 and 40. However, the components on the rotation drive shaft 13 side are removed and the rotation by the main shaft 12 is performed. Even with the force alone, the occurrence of burrs and the distortion of the processed neck can be suppressed to some extent.

  Further, not only one set of tools including the rear generation roller 71 and the front generation roller 72 but also a plurality of sets can be installed so that drawing can be performed in parallel to increase productivity. In this case as well, it is desirable to provide a pair of left and right for each processing point so that it is clamped by a clamping mechanism such as a collet chuck on both sides of the pipe processing point.

  Furthermore, the movement of the main shaft 12 and / or the tool (the rear generating roller 71 and the front generating roller 72) for positioning the tool with respect to the pipe machining point may be automated. The work efficiency is further improved by automatically moving the tool or the spindle 12 to the adjacent machining point after the constriction machining at a certain machining point.

  The present invention is applicable to a processing apparatus that processes a plurality of constrictions in a pipe material.

The front view of the drawing apparatus which concerns on one embodiment of this invention Top view of the drawing apparatus according to the above embodiment Partial side sectional view of the drawing apparatus according to the above embodiment Side sectional view showing the configuration of the left and right collet chucks Partial sectional view for explaining the holding structure of the pipe material Partial top view for explaining the positional relationship between the pair of X-axis stages and the front and rear generating rollers Partial sectional view for explaining the relationship between the pair of X-axis stages and the feed screw of the shaft feeding device (X-axis) The conceptual diagram for demonstrating the work creation profile in the said one Embodiment External view of superconducting acceleration cavity consisting of multiple cells

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Mother machine, 11 ... Lathe bed, 12 ... Main shaft, 13 ... Rotation drive shaft, 14 ... Gear mechanism, 15 ... Left fixed block, 16 ... Right fixed block, 17, 18 ... Casing, 19 ... Z-axis stage, 21 ... Axis feeder (Z axis), 22 ... Feed screw, 23a, 23b ... Guide rail, 24, 25 ... X axis stage, 26 ... Axis feeder (X axis), 27 ... Feed screw, 28 ... NC lathe controller, DESCRIPTION OF SYMBOLS 31 ... Mounting plate, 32 ... Housing, 33 ... Main shaft side gear, 34 ... Rotary drive shaft side gear, 35 ... Bearing, 36 ... Left collet chuck, 37 ... Left collet chuck side gear, 38 ... Rotary drive shaft side gear (left side) ), 39 ... Right collet chuck, 40 ... Right collet chuck side gear, 41 ... Rotation drive shaft side gear (right side), 42 ... Cylindrical member, 43 ... Collet, 44 ... Adapter member, 45 ... Pushing base 46 ... Screw member, 47, 48, 49 ... Ball bearing, 52 ... Cylindrical member, 53 ... Collet, 54 ... Adapter member, 55 ... Pushing base, 56 ... Screw member, 57, 58, 59 ... Ball bearing, 61, 62 ... Pipe guide member, 63 ... Fixed ring, 64 ... Moveable member, 65 ... Belleville spring, 66 ... Engagement member, 71 ... Rear creation roller, 72 ... Front creation roller, 73 ... Fixed ring, 74 ... Moveable member, 75 ... engagement member.

Claims (4)

A main shaft to which a pipe material to be a workpiece is attached and driven to rotate;
A pair of generating rollers disposed opposite to each other with a pipe member attached to the main shaft in a radial direction, and for pushing the pipe member toward the pipe central axis side to provide a constriction;
An X-axis feed mechanism for moving each of the generating rollers by the same amount in the pipe central axis side, which is the radial direction of the pipe material, or in the opposite direction;
A Z-axis feed mechanism that integrally moves each of the generating rollers and the X-axis feed mechanism in the pipe axis direction;
A pair of clamping mechanisms that are arranged on both sides in the pipe axial direction across the processing point of the pipe material by the generating roller and clamp the pipe material from the outer periphery,
A support frame that rotatably supports each of the clamp mechanisms;
In constricted processing apparatus pipes material provided with the,
A rotational drive shaft that is arranged in parallel with the main shaft and transmits the rotational force of the main shaft in a reversed manner;
A clamp mechanism side gear provided on each outer periphery of each clamp mechanism, and a rotary drive shaft side gear meshed with a corresponding clamp mechanism side gear provided at a position facing each clamp mechanism side gear on the rotary drive shaft; A pair of gear trains consisting of
The pipe material constriction processing apparatus, wherein the support frame rotatably supports the rotary drive shaft in a region facing each of the clamp mechanisms. The X-axis feed mechanism and the Z-axis of the creation roller by the feed mechanism in the radial direction feed and the pipe axis direction of the feed of claim 1 Symbol placement of the pipe, characterized in that two-axis control from the NC lathe controller Constriction processing equipment. The clamping mechanism, pipe constriction processing apparatus according to claim 1 or claim 2 wherein, characterized in that it is constituted by a collet chuck. The pipe material is composed of a composite material of niobium (Nb) for the inner layer and copper (Cu) for the outer layer, or copper (Cu) for the inner layer, niobium (Nb) for the inner layer, and copper (Cu) for the outer layer. pipe constriction processing apparatus according to any one of claims 1 to 3, characterized in that used in the cavity.

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