JP6426387B2 - Tube body chuck device and machine tool - Google Patents

Description

  The present invention relates to a tube chuck device which is used for a machine tool such as a spinning machine and rotatably holds a cylindrical tube, and a machine tool including the tube chuck device.

  A machine tool for performing a spinning process or the like for plastically deforming a workpiece during continuous rotation includes a tube chuck device for rotatably holding the workpiece. For example, the spinning machine rotates the workpiece together with the gripping member in a state where the gripping member of the tube chuck device is pressed against the inner peripheral surface or the outer peripheral surface of the workpiece which is a cylindrical tubular member along the radial direction. The roll is pressed against the workpiece to give the workpiece a desired plastic deformation.

  As a conventional tube chuck device for rotatably supporting a workpiece, a plurality of gripping members disposed along the circumferential direction of the workpiece, each of which is movable in the radial direction of the workpiece, and movable in the axial direction of the workpiece And a drive member. At the time of axial movement of the drive member, the grip members are moved in the radial direction by sliding the plurality of grip members and the drive member on the tapered surface. The workpiece is held by a plurality of gripping members that are in pressure contact in the radial direction. (See, for example, Patent Document 1).

JP, 2014-004651, A

  However, in order to reliably rotate the workpiece, it is necessary to keep the gripping member pressed against the workpiece continuously when the workpiece is rotated, and an axial force continuously acts on the driving member. In the conventional tube chucking apparatus, since the drive member is rotatably supported via the bearing, an axial load from the drive member acts on the bearing even while the workpiece is rotating. For this reason, it is difficult to rotate the work at high speed, and it is necessary to use a high axial strength bearing in order to prevent breakage of the device, resulting in an increase in size and cost of the device. Such a problem similarly occurs in a chuck mechanism for pressing the gripping member against either the outer peripheral surface or the inner peripheral surface of the work.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a small and inexpensive tube chuck device capable of rotating a cylindrical tube at high speed without requiring a bearing for supporting only a drive member, and a machine tool provided with this tube chuck device. It is to do.

The tube chuck device of the present invention includes a sleeve , a driving member, a plurality of gripping members , a first regulating member, and a second regulating member . The sleeve has a cylindrical shape with at least a first end open. The drive member is inserted into the sleeve so as to be movable along only the axial direction of the sleeve by being in contact with the sleeve at a part of the circumferential surface, and is provided with a drive side inclined surface on the first end side. Each of the plurality of gripping members, and freely move along the radial direction of the sleeve in each of the plurality of positions in the circumferential direction of the sleeve is held in the sleeve, the drive-side inclined surface in sliding contact along the axial direction of the sleeve driven A side inclined surface and an abutting surface which abuts on the inner peripheral surface or the outer peripheral surface of the workpiece are integrated with the driving member only in the circumferential direction of the sleeve . An axial drive source provides the drive member with an axial displacement of the sleeve .

When a moving force is supplied from the axial drive source to the drive member, the drive member moves in the axial direction, and the drive side inclined surface slides on the driven side inclined surface, whereby the plurality of gripping members move in the radial direction. By moving the drive member in the direction in which the contact surfaces of the plurality of gripping members approach or separate, the contact surfaces of the plurality of gripping members are brought into pressure contact with the outer peripheral surface or the inner peripheral surface of the work, The workpiece is held by the gripping member. Supplying rotational force to the sleeve in this state, rotation of the sleeve is transmitted to the plurality of gripping members through the driving member, the sleeve, the drive member, a plurality of gripping members and the workpiece are rotated integrally.

Since the drive member does not move (rotate) in the circumferential direction with respect to the sleeve and the plurality of gripping members, it is not necessary to support the drive member by bearings. Since axial movement of the drive member is not transmitted to the sleeve , no axial load is exerted on the bearing that supports the sleeve .

The first restricting member is a pin passing through an axial through hole formed in the inside of the sleeve, and is constituted by a pin fixed to the drive member, while allowing axial movement of the drive member in the sleeve It restricts the movement of the circumferential direction of the drive member. Rotation of the sleeve is reliably transmitted to the driven member by the first regulating member.

The second restricting member includes a plurality of keys which are fitted in the radial direction to both the first key groove formed on each of the plurality of gripping members and the second key groove formed on the sleeve. restricting movement in the circumferential direction while allowing movement of the respective radial direction of the plurality of gripping members relative to the sleeve. Rotation of the sleeve is reliably transmitted to each of a plurality of gripping members by the second regulating member.

The machine tool of the present invention comprises the above tubular body chuck device, and a frame for supporting the sleeve, and a rotation driving source for supplying rotation to the sleeve, the machining apparatus for machining a workpiece continuous rotating, the.

According to the present invention, since the drive member does not move in the circumferential direction with respect to the sleeve and the plurality of gripping members, it is not necessary to support the drive member by a bearing. Also, since axial movement of the drive member is not transmitted to the sleeve , no axial load acts on the bearing that supports the sleeve . By these, the bearing which supports only a drive member can be made unnecessary, and the tube chuck apparatus and machine tool which rotate a cylindrical tube at high speed can be comprised small and inexpensively.

FIG. 1 is a schematic plan view of a spinning machine which is a machine tool according to an embodiment of the present invention. It is side surface sectional drawing of the principal part of the tube chuck | zipper apparatus with which the spinning machine is equipped. (A)-(C) is a rear view, a side sectional view, and a front view of a grasping member which constitutes the tube chuck device.

  Below, the case where the tube chuck apparatus concerning embodiment of this invention is applied to the spinning machine which is a machine tool is mentioned as an example, and is demonstrated.

  As shown in FIG. 1, the spinning machine 100 includes a tube chuck device 10, a motor 20, and a forming device 30, and presses the roller 31 against a workpiece W of a continuously rotating cylindrical tube to plastically deform it into a desired shape. Drawing to produce By mounting a dedicated tool on the forming apparatus 30 instead of the roller 31, it is possible to perform processing other than drawing processing such as end cutting and deburring.

  The tube chuck device 10 includes a frame 11, a sleeve 12, a drive member 13, three grip members 14, a drive shaft 15, and a cylinder 16, and supports the work W rotatably about its axis.

  The frame 11 rotatably supports the sleeve 12 via a bearing 111. The sleeve 12 has a cylindrical shape with both ends open, and the first end 12A side is a large diameter portion 121, and the second end 12B side is a small diameter portion 122. The pulley 123 is fixed to the outer peripheral surface of the small diameter portion 122 of the sleeve 12 in a state of being externally fitted.

  The drive member 13 has an annular shape with an outer diameter substantially equal to the inner diameter of the large diameter portion 121, and is movable only in the axial direction of the workpiece W in the large diameter portion 121. The inner circumferential surface of the drive member 13 is a frusto-conical drive-side inclined surface 131.

  Each of the three gripping members 14 is disposed at a position inside the drive member 13 and at a position where the circumferential direction of the workpiece W is divided into three. The outer surface of each gripping member 14 is formed as a frusto-conical driven side slope 141 in contact with the drive side slope 131.

  The driving side inclined surface 131 and the driven side inclined surface 141 can also be formed in a plane that is always in surface contact with each other.

  The outer side surface of each gripping member 14 is a cylindrical contact surface 142 that is in surface contact with the outer peripheral surface of the workpiece W. Each of the three gripping members 14 is held by the sleeve 12 so as to be movable only in the radial direction. The number of holding members 14 may be two or more, and is not limited to three.

  One end of the drive shaft 15 is fixed to the bottom surface of the drive member 13, and the other end is fixed to the piston 161 of the cylinder 16. The cylinder 16 is a hydraulic cylinder as an example, and corresponds to the axial drive source of the present invention. The cylinder 16 moves the drive shaft 15 in the direction of the arrow X1 and in the direction of the arrow X2 by introducing pressure oil selectively to the front and back sides of the piston 161 via the ports 162 and 163. . The cylinder 16 is not limited to a hydraulic cylinder, and an air cylinder can also be used.

  The outer diameter of the enlarged diameter portion 151 of the axial intermediate portion of the drive shaft 15 is made equal to the inner diameter of the boss portion 124 formed on the inner peripheral surface of the sleeve 12. The drive shaft 15 is axially slidable with respect to the boss portion 124 at the enlarged diameter portion 151.

  When the workpiece chucking device 10 supports the workpiece W, the cylinder 16 is driven to move the drive shaft 15 most in the direction of the arrow X1 along the axial direction, and the workpiece is held between the three gripping members 14 Insert W

  When the cylinder 16 is driven from this state to move the drive shaft 15 in the direction of the arrow X1 along the axial direction, the drive member 13 moves in the direction of the arrow X1 within the large diameter portion 121, and the drive side tilt of the drive member 13 The surface 131 moves in the direction of the arrow X1 while sliding on the driven-side inclined surface 141. When the drive side inclined surface 131 moves to the large diameter side in the driven side inclined surface 141, the three gripping members 14 move in the direction to approach each other along the radial direction, and the three gripping members 14 abut The work W is supported by the surface 142 being in pressure contact with the outer peripheral surface of the work W.

  The motor 20 corresponds to the rotational drive source of the present invention, and fixes the pulley 202 to the output shaft 201. A belt 21 is stretched around the pulley 202 and the pulley 123. The motor 20 supplies rotation to the sleeve 12 via the pulley 202, the belt 21 and the pulley 123.

  In the sleeve 12, the drive member 13 is restricted from moving in directions other than the axial direction, and the holding member 14 is restricted from moving in directions other than the radial direction. Further, since the drive shaft 15 is fixed to the drive member 13, the drive shaft 15 moves integrally with the drive member 13, and movement in directions other than the axial direction is restricted in the sleeve 12. For this reason, when the sleeve 12 rotates, the drive member 13, the drive shaft 15, and the gripping member 14 rotate integrally with the sleeve 12, and the work W rotates about the axis.

  The forming apparatus 30 which is the processing apparatus of the present invention includes the motors 33 and 34, and the cylinder 35, and the tool base 32 supporting the roller 31 can be reciprocated along the arrow X direction and the arrow Y direction. It is rotatably supported by By driving the motors 33 and 34 and the cylinder 35, the roller 31 is pressed against the outer peripheral surface of the continuously rotating workpiece W to be formed into a desired shape.

  At this time, in order to support the workpiece W reliably by the tube chuck device 10, the three gripping members 14 are urged in the direction in which they approach each other, and the contact surface 142 is brought into pressure contact with the outer peripheral surface of the workpiece W There is a need. Therefore, during the formation of the workpiece W, the cylinder 16 is continuously driven to continuously bias the drive member 13 and the drive shaft 15 in the arrow X1 direction.

  However, the drive member 13 and the drive shaft 15 do not rotate relative to the sleeve 12 and only slide the inner peripheral surface of the sleeve 12 along the axial direction, and need to be rotatably supported by bearings There is no In addition, since the sleeve 12 itself does not move in the axial direction, no external force in the axial direction acts on the bearing 111 that supports the sleeve 12 rotatably.

  As shown in FIG. 2, in the tube chuck device 10, the drive shaft 15 is provided with a flange 152 at one end. The flange 152 is fixed to one end of the drive shaft 15 by welding, for example. Through holes 153 are formed in the flange 152 at a plurality of circumferential positions. The fixing bolt 154 passes through the through hole 153. In the drive member 13, through holes 132 </ b> A and 132 </ b> B are formed at a plurality of circumferential positions facing the through holes 153. The fixing bolt 133 passes through the through holes 132A and 132B.

  A connection pin 17 is disposed between the through hole 153 and the through holes 132A and 132B facing each other. The connection pin 17 has, for example, a cylindrical shape, and female screw parts 171 and 172 are formed from the both ends toward the inside. The drive member 13 and the drive shaft 15 are integrated by screwing the fixing bolt 154 penetrating the through hole 153 to the female screw portion 171 and screwing the fixing bolt 133 penetrating the through holes 132A and 132B to the female screw portion 172. Fixed. The connection pin 17 and the fixing bolts 133 and 154 correspond to a first restricting member of the present invention.

  On the inner circumferential surface of the large diameter portion 121 of the sleeve 12, a convex portion 125 and a convex portion 126 are formed so as to be spaced apart from each other over the entire circumference. In the convex portion 125 and the convex portion 126, fitting holes 1251 and fitting holes 1261 are formed at a plurality of circumferential positions facing the through holes 153 and the through holes 132A and 132B. The connecting pin 17 is slidably fitted in the fitting hole 1251 and the fitting hole 1261 in the axial direction. The drive member 13 integrated with the connection pin 17 and the drive shaft 15 are allowed to move only in the axial direction with respect to the sleeve 12 and restricted in movement in the other direction, and rotate integrally with the sleeve 12.

  In FIG. 2, the upper side of the center line indicates that the drive member 13 and the drive shaft 14 have moved the most in the X1 direction, and the lower side of the center line have the drive member 13 and the drive shaft 14 having the most movement in the X2 direction. Is shown.

  Further, the sleeve 12 is divided into a plurality of annular parts along the axial direction to form the large diameter part 121, the small diameter part 122, the convex part 125 and the convex part 126, and these parts are formed The manufacturing cost can be reduced by connecting the two by welding or fastening bolts or the like.

  As shown in FIGS. 3A to 3C, the three gripping members 14 have the same shape. The driven side inclined surface 141 of the outer diameter portion of the gripping member 14 and the contact surface 142 of the inner peripheral portion are slightly shorter than a circular arc in which the circumference is equally divided into three in the circumferential direction. The back surface side of the outer peripheral surface of the gripping member 14 is a cylindrical portion 143 continuous with the driven side inclined surface 141. In the cylindrical portion 143, a collar portion 144 and a groove portion 145 are formed over the entire circumference. A keyway 148 is formed on the back of the gripping member 14 along the radial direction at the circumferential center. In each of the three gripping members 14, recessed portions 147 having a circular cross section are formed from the four positions of the side surfaces 146 facing each other toward the inside.

  Both ends of the cylindrical elastic member 19 are fitted into the concave portions 147 of the two holding members 14 whose side surfaces 146 face each other among the three holding members 14. The elastic member 19 generates an elastic force in a direction in which two gripping members 14 having side surfaces 146 facing each other are separated from each other.

  As shown in FIG. 2, the flange portion 144 is slidably fitted along the radial direction between the convex portion 125 and the convex portion 126 of the sleeve 12 in a state where the convex portion 126 is positioned in the groove portion 145. . The gripping member 14 is allowed to move only in a plane orthogonal to the axial direction in the sleeve 12 and is restricted from axial movement.

  As shown in FIG. 2, a key groove 127 is formed at a position facing the key groove 148 on the surface of the convex portion 125 of the sleeve 12 facing the back surface of the gripping member 14. The keys 18 are inserted in the radial direction in the key groove 148 and the key groove 127 which face each other. The rotation of the sleeve 12 is transmitted to the gripping member 14 via the key 18. Therefore, the gripping member 14 rotates integrally with the sleeve 12 together with the work W against which the contact surface 142 is in pressure contact. Also, the gripping member 14 is permitted to move only in the radial direction in a plane orthogonal to the axial direction in the sleeve 12. The key 18 and the key grooves 127 and 148, together with the collar portion 144 and the convex portions 125 and 126, correspond to a second restricting member of the present invention.

  While the drive shaft 15 and the drive member 13 move in the direction of the arrow X2 from the upper side of the central axis in FIG. 2, the three gripping members 14 are radially outward by the elastic force of the elastic member 19. Move to The contact between the driven-side inclined surface 141 and the drive-side inclined surface 131 is always maintained not only during the movement of the drive shaft 15 and the drive member 13 in the arrow X1 direction from the state below the central axis in FIG. Ru.

  As described above, the tube chuck device 10 moves the drive shaft 15 and the drive member 13 in the axial direction by the cylinder 16 by the contact of the drive-side inclined surface 131 and the driven-side inclined surface 141 with the radius of the gripping member 14. The workpiece W can be supported by the gripping member 14 by converting it into directional movement. In order to rotate the work W, the rotation of the motor 20 is supplied to the sleeve 12. The rotation of the sleeve 12 is transmitted to the drive member 13 and the drive shaft 15 via the connection pin 17 and is transmitted to the grip member 14 via the key 18. The workpiece W can be rotated integrally with the sleeve 12 together with the drive member 13, the grip member 14 and the drive shaft 15.

  The drive member 13, the gripping member 14 and the drive shaft 15 do not rotate relative to the sleeve 12, and therefore, it is not necessary to provide a bearing for rotatably supporting them. Further, since the drive member 13 and the drive shaft 15 slide in the axial direction on the inner peripheral surface of the sleeve 12, no load in the axial direction acts on the bearing 111 externally fitted to the sleeve 12. The rotary chuck device 10 does not need to use a bearing with high axial strength, and can prevent the increase in size and cost of the device.

  The above description of the embodiments should be considered in all respects as illustrative and not restrictive. The scope of the present invention is indicated not by the embodiments described above but by the claims. Further, the scope of the present invention is intended to include all modifications within the scope and meaning equivalent to the claims.

  For example, the tube chuck device of the present invention can be applied to machine tools other than the spinning machine 100 as well.

DESCRIPTION OF SYMBOLS 10-Tube body chuck device 11-Frame 12-Sleeve 13-Drive member 14-Grasp member 15-Drive shaft 16-Cylinder 17-Connection pin 18-Key 19-Resilient member 20-Motor 21-Belt 30-Forming device 31- Roller 111-bearing 121-large diameter portion 122-small diameter portion 123-pulley 131-drive side inclined surface 141-driven side inclined surface 142-abutment surface 202-pulley

Claims (3)

A sleeve having an open cylindrical shape with at least one end open;
Axially only in the movable held in the sleeve, an annular driving member having a driving-side inclined surface on the inner circumferential surface with respect to the sleeve,
Each of the plurality of positions in the circumferential direction of the sleeve is movable only in the radial direction with respect to the sleeve so as to be held by the sleeve, and the driven-side inclined surface slidably contacts in the axial direction A plurality of gripping members each having a surface and an abutting surface that abuts on the inner peripheral surface or the outer peripheral surface of the workpiece
An axial drive source that supplies the axial moving force to the drive member;
It is a pin which penetrates the axial direction through hole formed in the inside of the sleeve, and is constituted by the pin fixed to the drive member, and while the movement of the axial direction of the drive member relative to the sleeve is allowed, the circumference A first regulating member that regulates movement of the direction;
The plurality of keys with respect to the sleeve are constituted by keys which are fitted along the radial direction to both the first key groove formed on each of the plurality of gripping members and the second key groove formed on the sleeve. A second restricting member that restricts the circumferential movement while allowing the radial movement of each of the gripping members;
Tube chucking device having a. The tube chucking device according to claim 1, wherein the drive-side inclined surface and the driven-side inclined surface are in flat surfaces in constant surface contact with each other . The tube chucking device according to claim 1 or 2 ;
A frame pivotally supporting the sleeve;
A rotational drive source for supplying rotation to the sleeve;
A machine tool comprising: a processing device for performing predetermined processing on a workpiece which is held by the tube chuck device and continuously rotates.

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