JP6677536B2 - Work support device - Google Patents

Description

  The present invention measures the inner and outer diameters of a doughnut-shaped workpiece that has been machined with high precision, for example, by supporting the workpiece rotatably in the axial rotation direction of both centers to minimize the interference of the measuring element. The present invention relates to a work supporting device capable of performing high-precision polishing and cutting in addition to performing work.

  When measuring the diameter of the donut-shaped workpiece processed with high precision, the sleeve is expanded by the fluid pressure in the fluid chamber formed between the mandrail body and the sleeve, and the workpiece is expanded by the split collet. (For example, refer to Patent Document 1).

Japanese Utility Model Publication No. 5-56337

  By the way, since the sleeve is expanded by the fluid pressure of Patent Literature 1 and the work is held by the expanding action of the split collet, the expansion margin is small (about 0.1 mm for the collet of 0.5 mm). For this reason, there has been a problem that a mandrel having a collet for the diameter of the work is required.

Further, since the longitudinal direction (axial direction) becomes longer to expand the sleeve, there is a problem that the sleeve is not suitable for a work having a short gripping length.
Further, there is a problem that a force for pressing the work against the work stopper is not generated.

  Therefore, an object of the present invention is to provide a work supporting device that solves the above-mentioned problem.

  In order to solve the above problems, the present invention provides a core shaft in which the outer diameter from the tip to the middle becomes a small diameter portion, and the outer diameter from the middle to the distal end becomes a large diameter portion, and the tip surface of the core shaft and A hole provided so that the tip of the center opposed to the center of the end face is fitted therein, and fitted outside the large diameter portion so as to slide in the axial direction of the core shaft, and the collet claw on the tip side is A collet protruding from the large-diameter portion in the direction of the core shaft small-diameter portion; a sleeve fitted to the outside of the collet and the large-diameter portion to support a distal end on the large-diameter portion; A tapered surface portion provided to reduce the diameter of the collet claw in accordance with the sliding of the collet in the distal direction of the core shaft on both contact surfaces in the tip direction side and a hole on the terminal side of the core shaft connected to the core shaft. Recessed hole provided on the axis and rotating operation head A male screw housed in the hole and inserted into the concave hole, a through hole provided so that a bottom wall surface of the concave hole communicates with an outer peripheral surface of the large diameter portion, and a tip of the male screw A female screw screwed into the collet so as to move in the sliding direction of the collet, an engaging portion provided on the hole wall of the collet in conformity with the through hole, and a head at the tip end of the engaging portion. A pin that protrudes from the outer periphery of the female screw and is movably penetrated in the through-hole in the axial direction of the core shaft, and guide means that is provided to rotate the male screw freely at a fixed position. Is adopted.

  In addition, a core shaft in which the outer diameter from the tip to the middle becomes a small diameter part, and the outer diameter on the end side becomes a large diameter part from the middle, and the point of the center facing the center of the tip surface and the end surface of the core shaft are A hole provided so as to be fitted therein, a collet which is fitted to the outside of the large-diameter portion so as to slide in the axial direction of the core shaft, and a collet claw on a distal end side faces the direction of the small-diameter portion; And a stopper of a fitting work fitted to the outside of the large diameter portion and fixed to the large diameter portion, and a recessed hole provided on the axis of the core shaft connected to a terminal hole of the core shaft. A through-hole provided so that a male screw whose rotating operation head is accommodated in the hole and inserted into the recessed hole, and a bottom hole wall surface of the recessed hole communicates with an outer peripheral surface of the large diameter portion. And a female screw screwed into the tip of the male screw so as to move in the sliding direction of the collet, An engagement portion provided on the hole wall of the collet in alignment with the through-hole; and a head at a tip end of the engagement portion is engaged with the engagement portion so as to protrude from the outer periphery of the female screw. A pin which is movably penetrated in the axial direction of the shaft, and a collet formed by sliding the collet in the opposite direction of the small diameter portion to the small diameter portion side outer peripheral surface of the large diameter portion and the collet claw side inner peripheral surface of the collet. A configuration including a tapered surface portion provided to expand the diameter of the pawl and a guide means provided to rotate the male screw freely at a fixed position is adopted.

  As described above, according to the work supporting device of the present invention, after the outer diameter portion of the leading end of the donut shaped work fitted from the small diameter portion of the core shaft is fitted inside the collet claw of the collet, By engaging the tool with the operation head and rotating the male screw, the pin moves together with the female screw in the direction of the small-diameter portion. With this movement, the pin is engaged with the head of the pin. The collet having the portion is forcibly slid in the moving direction of the pin.

  As a result, while reducing the diameter of the collet claw of the collet by the tapered surface portion of the sleeve and the collet, the collet is pressed against the donut-shaped hole wall of the work, and the work can be stably and precisely gripped by the outer diameter gripping method with respect to the core shaft. At the same time, the measurement can be performed by bringing the probe of the measuring instrument into contact with the hole wall around the core axis of the work.

  Also, after inserting the inner diameter portion of the leading end of the donut-shaped work fitted from the small diameter portion of the core shaft outside the collet claw of the collet, the tool is engaged with the operation head in the hole and the male screw is turned. By moving the pin, the pin moves together with the female screw in the direction opposite to the small-diameter portion of the core shaft, and with this movement, the collet having the engaging portion engaged with the head of the pin is forcibly moved in the pin moving direction. Slide.

  As a result, while expanding the collet claw by the tapered surface portion of the collet and the large-diameter portion, the collet is pressed against the donut-shaped hole wall of the work, and the work can be stably and highly accurately gripped by the inner diameter gripping method with respect to the core shaft. The measurement can be performed by bringing the probe of the measuring instrument into contact with the hole wall around the core axis of the work, and the work drawn into the work stopper can be pressed to stably hold the work.

  A straight guide to the core axis is provided on the rear end side of the collet taper surface, so that even a collet shape having a short taper surface length can be pulled straight, so that high-precision gripping can be performed.

The core shaft used in the outer diameter gripping method and the inner diameter gripping method described above is composed of a large diameter portion and a small diameter portion, and a collet is fitted in the large diameter portion. It is located outside the outer circumference of the small diameter portion.
For this reason, the tracing stylus can be brought into contact with the measurement surface of the work without being interfered by the core axis.

  Further, in addition to supporting a measurement work, it can also be used to support a work on which polishing and cutting are performed.

FIG. 2 is a front view showing the first embodiment of the present invention. It is a partially notched enlarged front view which shows the principal part same as the above. FIG. FIG. It is a partially notched front view which shows 2nd Embodiment.

Next, an embodiment of the present invention will be described with reference to the accompanying drawings.
A shown in FIGS. 1 to 4 of the first embodiment of the present invention is a core shaft.

  The outer diameter of the core shaft A from the tip to the middle is a small-diameter portion 1, and the outer diameter from the middle to the distal end is a large-diameter portion 2.

  Holes 3 and 4 are provided at the centers of the distal end surface and the distal end surface of the core shaft A, into which the tip of the opposing center B is fitted.

  On the outer side of the large-diameter portion 2, a collet claw 5 on the distal end side is fitted so that a collet 6 protruding from the boundary between the large-diameter portion 2 and the small-diameter portion 1 toward the distal end of the core axis A slides. It is.

  As is well known, the collet claw 5 is provided with a plurality of slits 7 interspersed in the distal direction from the distal end surface of the collet 6 on the small diameter portion 1 side.

  Further, a sleeve 8 is fitted from the tip of the collet 6 toward the large-diameter portion 2, and the end of the sleeve 8 is supported (fixed) by screwing a bolt 9 into the large-diameter portion 2.

  In addition, a recessed hole 10 is provided from the bottom of the end side hole 4 of the core shaft A to the shaft core small diameter portion of the core shaft A, and the turning operation head 11 of the terminal is accommodated in the hole 4. The male screw 12 is inserted into the recess 10.

  In the case shown in the figure, the operation head 11 is rotated by providing a square hole 13 on the end face of the operation head 11 and fitting a tip of a wrench (not shown) as a rotation operation tool into the square hole 13. Let's do it.

  The male screw 12 is guided by a guide means C to freely rotate at a fixed position.

  In the case shown in the figure, the guide means C includes inner and outer peripheral surfaces of the concave hole 10 around the entire circumference of the semicircular annular groove 14 which matches the outer peripheral surface of the operation head 11 and the hole wall of the concave hole 10. Are sequentially pushed through the holes 15 communicating with each other, and are closed by the stopper 17 into which the holes 15 are screwed after the pushing is completed.

  Then, the male screw 12 is freely rotated by the ball 16 and a guide for preventing movement in the axial direction is performed. Since the male screw 12 is tightened by the rotational contact of the ball 16, friction is reduced, and a strong force is obtained with a weak force. Although the tightening can be performed, it is not limited to this.

  Further, a through hole 18 is provided in which the inner end wall of the recessed hole 10 communicates with the outer peripheral surface of the large diameter portion 2, and a male screw is inserted into the through hole 18 so as to advance and retreat along the axis of the core shaft A. A female screw 19 is screwed into the female screw 12, and a pin 20 is provided to extend from the outer peripheral surface of the female screw 19 and pass through the through hole 18.

  Further, on the peripheral wall of the collet 6, there is provided an engaging portion 21 corresponding to the through hole 18, and the engaging portion 21 is engaged with a head 22 provided at an end of the pin 20 in the protruding direction. It is fitted as follows.

  By this engagement relationship, the forward / backward movement of the female screw 19 is transmitted from the pin 20 to the forward / backward slide of the collet 6.

  In addition, the through hole 18 is formed in an oval shape so as not to hinder the sliding of the pin 20. In the illustrated case, the pin 20 is projected in two directions. However, the number of the pin 20 is not limited.

  The contact surface between the collet 6 and the sleeve 8 is provided with tapered surface portions 23 and 24 for reducing the diameter of the collet 6 as the collet 6 moves backward (toward the end of the core axis A).

The tapered surface portion 23 provided on the outer peripheral surface of the collet 6 is inclined upward (to increase the degree of protrusion of the outer diameter sequentially) in the tip direction of the core axis A, and is provided on the inner peripheral surface of the sleeve 8. Reference numeral 24 indicates a downward slope (so that the degree of protrusion of the inner diameter decreases gradually) in the terminal direction of the core axis A.
Reference numeral 25 in the drawing denotes a stopper fixed to the sleeve 8 via a bolt 26.

  When configured as described above, the work W is fitted from the front end side of the core shaft A, and the flange portion of the work W is fitted inside the front end of the collet 6, as shown in FIGS.

  Under this condition, the tool is engaged with the operation head 11 and the male screw 12 is rotated in one direction to move the pin 20 together with the female screw 19 in the right direction in FIG.

Then, since the collet 6 is slid rightward in FIG. 2 by the engagement relationship between the engaging portion 21 and the head 22, the diameter of each collet claw 5 of the collet 6 is reduced by the tapered surface portions 23 and 24 which are in contact with each other. .
As a result, the workpiece W is gripped by the core axis A (outside diameter gripping method).

  Thus, the tip of the center B can be fitted into the hole 3 on the distal end side and the hole 4 on the distal end side of the core shaft A to support the core shaft A rotatably.

  Thereafter, the measurement is performed by bringing the probe d of the measuring device D into contact with the inner diameter of the work W as shown in FIGS.

In the measurement, as shown in FIG. 2, the inner diameter of the collet claw 5 of the work W on the non-contact side is measured.
After the measurement, the support of the core shaft A by the center B is released, and the core shaft A is collected.

  Thereafter, by engaging the tool with the operation head 11 and rotating the male screw 12 in the other direction, the diameter of each collet claw 5 of the collet 6 is increased, and the holding of the work W is released. The released work W is collected.

Next, a second embodiment will be described with reference to FIG. 5 of the accompanying drawings.
A in FIG. 5 is a core shaft.

  The holes 3, 4 and the small-diameter portion 1, the large-diameter portion 2, and the male screw 12 inserted into the recessed hole 10, the operation head 11 of the male screw 12, the guide means C, A female screw 19 screwed into a male screw, a pin 20 protruding from the female screw 19, a collet 6 having a collet claw 5 fitted in the large diameter portion 2, and a through hole 18 for the pin 20 provided in the large diameter portion 2 for penetration. An engaging portion 21 provided on the collet 6 such that a head 22 provided on the pin 20 is in an engagement relationship, and a sleeve also serving as a stopper fitted to the outside of the collet 6 and fixed to the large-diameter portion 2 via the bolt 9. 8 is the same as in the first embodiment, and a detailed description is omitted.

  The difference between the first embodiment and the second embodiment is that the work W in the first embodiment is an outer diameter gripping method, whereas the work W in the second embodiment is an inner diameter gripping method. .

Due to this inner diameter gripping method (second embodiment), when the collet 6 slides in the direction from the small diameter portion 1 to the large diameter portion 2 in accordance with the turning operation of the male screw 12, a tapered surface portion of the outer peripheral surface of the large diameter portion 2 is formed. Each of the collet claws 5 of the collet 6 is expanded in the radially expanding direction at the contact surface between the base 31 and the tapered surface portion 32 of the inner peripheral surface of the collet 6, and the collet pawl 5 is pressed against the inner peripheral surface of the work W.
As a result, the workpiece W is held on the core shaft A by the inner diameter holding method.

  The diameter of the tapered surface portion 31 of the large-diameter portion 2 is gradually reduced (tapered) in the direction of the small-diameter portion 1 from the middle of the outer periphery of the large-diameter portion 2. It was provided so that the diameter was gradually increased in the direction.

  The work W holding means with respect to the core axis A, the support of the core axis A at the center, and the measurement by the measuring element d of the measuring device D are the same as those in the first embodiment, and detailed description is omitted.

  Naturally, as shown in FIG. 5, the tracing stylus d measures the inner diameter of a portion of the work W where the collet claw 5 does not contact.

  After the measurement, the core shaft A unsupported by both centers B is collected, and then the male screw 12 is rotated in the other direction using a tool engaged with the square hole 13, whereby the female screw is rotated. 19 moves to the opposite side of the operation head 11, and the collet 6 is forcibly slid in the direction of the small diameter portion 2 by the pin 20 and the engagement relationship between the engagement portion 21 and the head 22 which move together with this movement. Let it.

  As a result, the diameter of the collet claw 5 is reduced, the holding of the work W is released, and the released measured work W is recovered.

  In the first and second embodiments, the measurement of the work has been described. However, the present invention is not limited to this, and can be used for supporting the work W to be polished or cut.

A Core axis B Center C Guide means D Measuring device d Measuring element W Work 1 Small diameter portion 2 Large diameter portion 3 Hole 4 Hole 5 Collet claw 6 Collet 7 Slit 8 Sleeve 9 Bolt 10 Recessed hole 11 Operating head 12 Male screw 13 Square hole 14 Annular groove 15 Hole 16 Ball 17 Plug 18 Through hole 19 Female screw 20 Pin 21 Engaging portion 22 Head 23 Tapered surface portion 24 Tapered surface portion 25 Stopper 26 Bolt 31 Tapered surface portion 32 Tapered surface portion

Claims (2)

  The core shaft whose outer diameter from the tip to the middle becomes a small diameter part and the outer diameter on the end side becomes a large diameter part from the middle, and the pointed end of the center facing the center of the tip surface and the end surface of the core shaft fits. So as to slide in the axial direction of the core shaft outside the large-diameter portion, and the collet claw on the distal end projects from the large-diameter portion in the direction of the core-shaft small-diameter portion. A collet, a sleeve fitted to the outside of the collet and the large-diameter portion, and a distal end supported by the large-diameter portion, and the core of the collet provided on both contact surfaces of the sleeve and the collet in the distal direction. A tapered surface portion provided so as to reduce the diameter of the collet claw in accordance with the sliding in the axial terminal direction, a concave hole provided on the axis of the core shaft connected to a hole on the terminal side of the core shaft, and a rotating operation. The head was inserted into the hole with the head inside the hole A screw, a through hole provided so that the bottom hole wall surface of the concave hole and the outer peripheral surface of the large diameter portion communicate with each other, and a tip of the male screw screwed into the collet so as to move in the sliding direction of the collet. A female screw, an engaging portion provided on the hole wall of the collet in conformity with the through hole, and a head at the tip of the engaging portion being engaged with the engaging portion to project from the outer periphery of the female screw, and A work supporting apparatus comprising: a pin penetrating a through-hole movably in the axial direction of the core shaft; and guide means provided to rotate the male screw freely at a fixed position.   A core shaft whose outer diameter from the tip to the middle becomes a small diameter portion and the outer diameter on the end side becomes a large diameter portion from the middle, and the pointed end of the center facing the center of the tip surface and the end surface of the core shaft fits. And a collet which is fitted to the outside of the large-diameter portion so as to slide in the axial direction of the core shaft, and wherein the collet claw on the tip side faces the direction of the small-diameter portion; A stopper for a fitting work fitted to the outside of the large diameter portion and fixed to the large diameter portion; a recessed hole provided on the axis of the core shaft connected to a hole on the end side of the core shaft; A male screw inserted into the recessed hole with the dynamic operation head housed in the hole, a through hole provided so that the bottom hole wall surface of the recessed hole and the outer peripheral surface of the large diameter portion communicate with each other, A female screw screwed into the tip of the male screw so as to move in the sliding direction of the collet; An engaging portion provided on the hole wall of the collet in conformity with the above, and a head at the tip end of the engaging portion is engaged with the engaging portion and protrudes from the outer periphery of the female screw. The pin movably penetrated in the axial direction, and the collet claw along with the small-diameter portion of the collet on the collet claw-side inner peripheral surface of the collet on the small-diameter portion-side outer peripheral surface of the large-diameter portion. A work supporting device comprising: a tapered surface portion provided to increase the diameter; and guide means provided to rotate the male screw freely at a fixed position.

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