JP2010099785A - Work pallet positioning and fixing mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a work pallet positioning and fixing mechanism capable of enhancing attaching accuracy of a positioning mechanism, facilitating the design and manufacture and the inventory management of a clamping mechanism, and improving the support rigidity of the center part of the work pallet. <P>SOLUTION: The work pallet positioning and fixing mechanism 2 having the work pallet 1 and a base plate 5 in which the work pallet is detachable from above, positioning the work pallet in vertical and horizontal directions, constraining the rotation of the work pallet, and fixing the work pallet to the base plate includes: an annular base member 6 attached to the center part of the base plate in the state of being projected partially from the top face of the base plate; the positioning mechanism 70 provided on the base member and the work pallet, and capable of positioning the work pallet in horizontal and vertical directions with respect to the base member; and a plurality of positioning and clamping mechanisms 80 provided on a plurality of positions respectively on the peripheral side of the positioning mechanism in the base plate, and capable of positioning and fixing the work pallet in a vertical direction with respect to the base plate. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a work pallet positioning and fixing mechanism, and more particularly to a work pallet that is configured to position a work pallet three-dimensionally with respect to a base plate and restrain and clamp a rotation around a vertical axis.

  In a machine tool such as a machining center, a workpiece to be machined is thrown into the machine tool in a state of being fixed to a work pallet. In order to accurately position and fix the work pallet on the table of the machine tool, a plurality of positioning mechanisms for positioning the work pallet and a plurality of clamping mechanisms for clamping are provided on the table side.

  In the workpiece clamping device of Patent Document 1, plate members 40 having a recessed central portion are fixed at four locations on the lower surface of the workpiece holding member 2, and the base member 1 is engaged with four plate members 40 that are engaged. A positioning element 5 and four sets of chuck members 4 for clamping the work holding member 2 to the base member 1 by a ball lock mechanism are provided. The workpiece holding member 2 is positioned in the horizontal direction with respect to the base member 1 by the four sets of positioning elements, and the surface region 28 of the workpiece holding member 2 is brought into contact with the reference surface 27 of the chuck member 4, thereby positioning in the vertical direction. In addition, the chuck member 4 is configured to be clamped.

  In the clamping device with a datum function of Patent Document 2, four sets of clamp mechanisms 4, 5, 6, and 6 for positioning and fixing the work pallet 3 are provided on the base member 2, and the lower part of the work pallet 3 has 4 Four engagement ring members 4b, 5b, 6b, 6b corresponding to the set of clamp mechanisms 4, 5, 6, 6 are provided, and two sets of clamp mechanisms 4, 5 and two engagement ring members in a diagonal relationship are provided. The work pallet 3 is positioned in the vertical and horizontal directions by 4b and 5b and can be clamped, and the work pallet 3 is clamped by the remaining two sets of clamp mechanisms 6 and 6 and the two engagement ring members 6b and 6b. It is configured to be possible.

Japanese Patent Laid-Open No. 7-132429 JP 2001-38564 A

  In the workpiece clamping device of Patent Literature 1, four plate members constituting four sets of positioning elements are fixed to a workpiece holding member with a plurality of bolts, and four centering members are fixed to a base member with a plurality of bolts. As a result, the number of bolt fastening points for attaching the positioning element increases, so that it is difficult to increase the positioning element mounting accuracy, and the workpiece cutting accuracy is reduced.

In the clamp device with datum function of Patent Document 2, since the four sets of clamp mechanisms are composed of three types of clamp mechanisms 4, 5, 6, and 6, design and manufacture of these multiple types of clamp mechanisms and inventory management are possible. It becomes complicated and the manufacturing cost increases.
Further, in Patent Documents 1 and 2, since four sets of clamp mechanisms are fixed to the four corners of the base member to support the work pallet, there is no portion corresponding to the positioning mechanism in the central portion of the base member. Since the support rigidity is lowered, the larger the workpiece pallet is, the more easily the elastic deformation of the central portion occurs, and the accuracy of cutting the workpiece is lowered.

  An object of the present invention is to provide a work pallet positioning / fixing mechanism that can improve the mounting accuracy of the positioning mechanism, to provide a work pallet positioning / fixing mechanism that is easy to design and manufacture a clamp mechanism and to manage inventory, and to provide a central portion of the work pallet. For example, a work pallet positioning and fixing mechanism that can improve the support rigidity is provided.

  The work pallet positioning and fixing mechanism according to claim 1 has a work pallet and a base plate to which the work pallet can be attached and detached from above, positions the work pallet in the vertical direction and the horizontal direction with respect to the base plate, and the work pallet. In a work pallet positioning and fixing mechanism that restrains the rotation of the base plate about the vertical axis and fixes the work pallet to the base plate, it is attached to the central portion of the base plate so as to partially protrude from the upper surface of the base plate. An annular base member, a positioning mechanism which is mounted on the base member and the work pallet and can position the work pallet in the horizontal direction and the vertical direction with respect to the base member, and the positioning mechanism of the base plate. The work pallet is installed vertically at a plurality of positions on the outer peripheral side, and the work pallet is positioned vertically with respect to the base plate. A plurality of positioning and clamping mechanism that can be and fixable determined, is characterized by comprising a.

  When the work pallet is positioned by engaging with the base plate from above, the work pallet can be positioned in the horizontal direction and the vertical direction with respect to the base plate by the positioning mechanism attached to the base member. In this state, the work pallet can be positioned and fixed to the base plate in the vertical direction by a plurality of positioning and clamping mechanisms.

  The work pallet positioning and fixing mechanism according to a second aspect is the invention according to the first aspect, wherein the base plate is formed in a polygonal shape in a plan view, and the plurality of positioning and clamping mechanisms include a plurality of corner portions of the base plate. It is characterized by being provided between the outer peripheral portions of the base member facing the corner portions.

  According to a third aspect of the present invention, there is provided the work pallet positioning / fixing mechanism according to the first aspect of the invention, wherein the positioning mechanism includes a taper engaging male portion having a smaller diameter toward an upper portion provided on the base member, and a taper provided on the work pallet. The taper engagement male part is formed into a regular polygon having a plurality of arcuate corners and a plurality of side portions whose horizontal cross section is convex outward. The portion is formed in a regular polygon having a plurality of arcuate corners and a plurality of side portions whose horizontal cross section is convex outward, and an outer peripheral side wall portion of the taper engagement female portion and an inner periphery of the taper engagement male portion The taper engagement female portion is configured to closely contact the taper engagement male portion through elastic deformation in at least one radial direction of the side wall portion.

  According to a fourth aspect of the present invention, there is provided the work pallet positioning and fixing mechanism according to the third aspect of the present invention, wherein the positioning mechanism is formed on the Z reference surface formed on the annular portion of the base member and on the work pallet. A lower end reference surface that abuts, and the Z reference surface is in contact with the lower end reference surface when the taper engagement male part and the taper engagement female part are in close contact with each other.

  The work pallet positioning and fixing mechanism according to claim 5 is the invention according to claim 4, wherein the work pallet has a ring member fixed to the work pallet, and the taper engagement female portion is formed on the ring member. It is characterized by that.

  The work pallet positioning / fixing mechanism according to claim 6 is the invention according to claim 3, wherein each of the plurality of side portions in the horizontal cross section of the taper engaging male portion is formed in an arc shape slightly bulging outward. It is characterized by.

  The work pallet positioning / fixing mechanism according to a seventh aspect is characterized in that, in the invention according to the third aspect, each of the plurality of side portions in the horizontal cross section of the tapered engagement male portion is formed in a straight line.

  The work pallet positioning / fixing mechanism according to an eighth aspect is the invention according to the third aspect, wherein each of the plurality of side portions in the horizontal cross section of the taper engaging female portion includes a relief recess formed in a central portion thereof, and the relief portion. And a pair of engagement contact portions formed on both sides of the recess.

  The work pallet positioning and fixing mechanism according to claim 9 is the invention according to claim 3 or 8, wherein each of the plurality of side portions in the horizontal cross section of the tapered engagement male portion includes an escape recess formed in a central portion thereof. It is characterized by having a pair of engagement contact portions formed on both sides of the relief recess.

  According to a tenth aspect of the present invention, there is provided the work pallet positioning / fixing mechanism according to the first aspect, wherein the positioning / clamping mechanism includes a ball lock mechanism, a disc spring laminated body for driving the ball lock mechanism, and the ball lock mechanism. And a hydraulic cylinder for driving the unclamp.

  A work pallet positioning and fixing mechanism according to an eleventh aspect is the invention according to the first aspect, wherein a clamp mechanism for fixing a central portion of the work pallet is provided on the base member, and the clamp mechanism is a clamp provided on the base member. And a ball lock mechanism provided on the work member pallet.

  The work pallet positioning and fixing mechanism according to a twelfth aspect of the present invention is the invention according to the fifth aspect, wherein the ring member includes a plurality of side portions of the taper engaging female portion in close contact with a plurality of side portions of the taper engaging male portion. It is characterized by having an elastic deformation promoting portion that promotes elastic deformation in the diameter expansion direction when engaged.

  According to a thirteenth aspect of the present invention, there is provided the work pallet positioning / fixing mechanism according to the twelfth aspect of the invention, wherein the elastic deformation promoting portion is formed in an arc shape in a plan view formed on the wall portion surrounding the tapered engagement female portion so as to be open at the lower end. A plurality of arc grooves are provided.

  A work pallet positioning and fixing mechanism according to a fourteenth aspect is the invention according to the twelfth aspect, wherein the elastic deformation promoting portion is formed in an arc shape in a plan view formed in an open upper end on a wall portion surrounding the tapered engagement female portion. A plurality of arc grooves are provided.

  According to a fifteenth aspect of the present invention, the work pallet positioning / fixing mechanism is characterized in that, in the second aspect of the invention, the base plate is formed in a rectangular shape in plan view, and four sets of positioning and clamping mechanisms are provided.

  According to a sixteenth aspect of the present invention, there is provided the work pallet positioning / fixing mechanism according to the fifteenth aspect, wherein the diameter of the base member is formed to be 1/3 to 1/2 of the smaller width of the base plate. It is said.

  According to the first aspect of the present invention, when positioning the work pallet by engaging with the base plate from above, the work pallet is positioned in the horizontal direction and the vertical direction with respect to the base plate by the positioning mechanism provided on the base member. be able to. In this state, the work pallet can be positioned and fixed to the base plate in the vertical direction by a plurality of positioning and clamping mechanisms, so that the work pallet can be positioned and fixed with respect to the base plate with high accuracy.

  Since the base member is attached to the center part of the base plate, the support rigidity of the center part of the base plate is improved when clamping the work pallet, and the elastic deformation of the center part of the work pallet is suppressed to improve the cutting accuracy. can do. Since all of the positioning / clamping mechanisms have the same structure, the design / manufacturing and inventory management of the positioning / clamping mechanisms are facilitated, and the manufacturing cost can be reduced. Since the positioning mechanism can position and rotate the work pallet in the horizontal direction and the vertical direction with respect to the base plate only at the central portion of the base plate, the mounting accuracy can be improved and the accuracy of the cutting process can be increased.

  According to the second aspect of the present invention, the base plate is formed in a polygonal shape in plan view, and the plurality of positioning and clamping mechanisms are provided between the plurality of corner portions of the base plate and the outer peripheral portion of the base member facing the corner portions. Since it is equipped respectively, the support rigidity with respect to the base plate of a work pallet can be improved.

  According to the invention of claim 3, the taper engagement male part is connected to the taper engagement male part via the elastic deformation of at least one of the outer peripheral side wall part of the taper engagement female part and the inner peripheral side wall part of the taper engagement male part. Therefore, the two-surface restraint can be achieved through this elastic deformation. Therefore, two-plane restraint is ensured without finely adjusting the height direction position of the lower end reference plane or the Z reference plane, and without using a movable member for either the taper engagement male part or the taper engagement female part. Can be achieved.

  The taper engaging male part is a regular polygon having a plurality of arcuate corners and a plurality of side parts whose horizontal cross section is convex outward, and has a structure in which the diameter decreases toward the top. The horizontal section has a structure having a plurality of arcuate corners and a plurality of side portions protruding outward, and therefore, with respect to the base plate through the engagement of the taper engagement male part and the taper engagement female part. The work pallet can be reliably constrained to rotate.

  According to the invention of claim 4, the positioning mechanism includes a Z reference surface formed on the annular portion of the base member, and a lower reference surface formed on the work pallet and in contact with the Z reference surface. Since the Z reference surface is in contact with the lower end reference surface when the portion and the taper engagement female portion are in close contact with each other, the work pallet can be positioned in the vertical direction with respect to the base plate.

  According to the invention of claim 5, since the work pallet has the ring member fixed to the work pallet, and the taper engagement female part is formed on the ring member, the taper engagement female part is directly attached to the work pallet. Manufacturing costs can be reduced compared to forming.

  According to the invention of claim 6, since each of the plurality of side portions in the horizontal cross section of the taper engagement male part is formed in an arc shape slightly bulging outward, the taper engagement male part and the taper engagement female are formed. The contact area between the side portion of the taper engagement male portion and the side portion of the taper engagement female portion increases when the portion engages in close contact with each other, and the ring member can be centered with high accuracy. Can improve mentality.

  According to the invention of claim 7, since each of the plurality of side portions in the horizontal cross section of the taper engagement male part is formed in a straight line, the taper engagement male part and the taper engagement female part are in close contact with each other. When engaged, the rotational restraining force can be improved by the linear shape of each of the plurality of side portions.

  According to the eighth aspect of the present invention, each of the plurality of side portions in the horizontal cross section of the taper engaging female portion has a relief recess formed at the center thereof and a pair of engagements formed on both sides of the relief recess. When the taper engagement male part and the taper engagement female part are engaged in close contact with each other, the pair of contact close contact parts doubles the number of close contact points in the horizontal direction. Positioning accuracy and rotational restraint force are improved. Further, since the relief recesses are provided in the side portions, the compressive stress of the pair of engagement contact portions increases, so that the elastic deformation in the diameter expansion direction can be promoted and the adhesion can be improved. Furthermore, since it is not necessary to polish the surface of the relief recess, the polishing cost can be reduced.

  According to the ninth aspect of the present invention, each of the plurality of side portions in the horizontal cross section of the taper engaging male portion includes an escape recess formed at the center thereof and a pair of engagements formed on both sides of the escape recess. When the taper engagement male part and the taper engagement female part are engaged in close contact with each other, the pair of contact close contact parts doubles the number of close contact points in the horizontal direction. Positioning accuracy and rotational restraint force are improved. Further, since the relief recesses are provided in the side portions, the compressive stress of the pair of engagement contact portions increases, so that elastic deformation in the diameter reduction direction can be promoted and the adhesion can be improved. Furthermore, since it is not necessary to polish the surface of the relief recess, the polishing cost can be reduced.

  According to the invention of claim 10, the positioning and clamping mechanism includes a ball lock mechanism, a disc spring laminated body for driving the ball lock mechanism, and a hydraulic cylinder for driving the ball lock mechanism to be unclamped. Therefore, when clamping, the ball lock mechanism is driven by the urging force of the disc spring stack, and when unclamping, the ball lock mechanism is unclamped by the hydraulic pressure supplied to the hydraulic operating chamber. be able to.

  According to the eleventh aspect of the invention, since the clamp mechanism includes the hydraulic cylinder for clamping and the ball lock mechanism, the Z reference surface of the base member, the lower end reference surface of the ring member, the taper engagement male portion, and the taper engagement female. The two parts are constrained by the portion, the rotation is restricted by the taper engaging male part and the taper engaging female part, and the work pallet can be firmly fixed to the base member.

  According to the invention of claim 12, the elastic deformation of the taper engagement female portion of the ring member can be promoted by the elastic deformation promoting portion.

  According to the invention of claim 13, the elastic deformation promoting portion includes a plurality of arc-shaped grooves formed in an open shape at the lower end in the wall portion of the taper engaging female portion, and thus has a simple structure. It becomes an elastic deformation promoting part.

  According to the invention of claim 14, the elastic deformation promoting portion includes a plurality of arc-shaped grooves formed in an open shape at the upper end of the wall portion of the taper engaging female portion, and thus has a simple structure. It becomes an elastic deformation promoting part.

  According to the fifteenth aspect of the present invention, the base plate is formed in a rectangular shape in a plan view, and four sets of positioning and clamping mechanisms are provided, so that a rectangular work pallet positioning and fixing mechanism is obtained in a plan view.

  According to the invention of claim 16, since the diameter of the base member is formed to be 1/3 to 1/2 of the smaller width of the base plate, the work pallet corresponding to the fixing of the large work pallet. It becomes a positioning and fixing mechanism.

  Hereinafter, the best mode for carrying out the present invention will be described based on examples.

First, the work pallet positioning and fixing mechanism 2 will be described with reference to FIGS.
A work pallet positioning and fixing mechanism 2 (hereinafter referred to as a positioning and fixing mechanism) is attached to the work pallet 1, a ring member 4 fixed to the work pallet 1, a base plate 5, and a central portion of the base plate 5. And a base member 6. The base member 6 includes a clamp mechanism 8 that fixes the ring member 4 so that the ring member 4 can be released and a positioning mechanism 70 that can position the ring member 4 in the horizontal direction and the vertical direction. The base plate 5 is provided with four sets of positioning and clamping mechanisms 80 for fixing the work pallet 1 so that the work pallet 1 can be fixed and released. The base plate 5 is fixed to the table of the machine tool with a plurality of bolts.

Next, the work palette 1 will be described.
The work pallet 1 is for fixing a workpiece to be machined by a machine tool such as a machining center. The work pallet 1 is constituted by a clamp mechanism 8, a positioning mechanism 70, and a plurality of positioning and clamping mechanisms 80. The base plate 5 is positioned and fixed in a vertical direction and a horizontal direction on a table (or a table-equivalent member) of the machine tool, and restrains rotation of the work pallet 1 around the vertical axis with respect to the table.

  As shown in FIGS. 3 and 4, the work pallet 1 includes a pallet main body 1a made of a rectangular steel plate member in plan view, and a ring member fixed to the lower portion of the pallet main body 1a with a plurality of bolts 4a. 4 and four locating rings 75 fixed by a plurality of bolts 75a.

  The vertical axis 4b of the ring member 4 passes through the center of the pallet main body 1a, and the outer diameter of the ring member 4 is about 2/5 of the larger width of the pallet main body 1a and about the smaller width. Ranked 1/2. The ring member 4 is formed with a circular opening 4c having a diameter of about 0.5 to 0.6 times its diameter. In the vicinity of the upper side of the circular opening 4c, a circular opening is formed on the lower surface of the pallet body 1a. A circular recess 1b having a diameter slightly larger than 4c is formed, and the circular recess 1b and the circular opening 4c open downward.

Next, the base plate 5 will be described.
As shown in FIGS. 1 and 2, the base plate 5 is formed in a rectangular shape in plan view from a steel plate member from which the work pallet 1 can be attached and detached. An annular base member 6 is attached to the center portion of the base plate 5 so as to partially protrude from the upper surface of the base plate 5, and the corners of the four corners of the base plate 5 are opposed to the corners. Four sets of positioning and clamping mechanisms 80 are provided in the vicinity of the intermediate position between the outer peripheral portions of the member 6, respectively. The diameter of the base member 6 is formed to be 1/3 to 1/2 of the smaller width of the base plate 5. On the side surface of the base plate 5, a hydraulic supply / discharge hole 73 for supplying and discharging hydraulic pressure, an air supply hole 74 for supplying air, and the like are provided. The four positioning / clamping mechanisms 80 may be provided between the corners of the four corners and the base member 6 facing the corners, depending on the size of the base plate.

Next, the base member 6 will be described.
As shown in FIGS. 1, 2, 5, and 6, the base member 6 includes a vertical axis 6 a and a Z reference surface 10 that receives the lower end reference surface 9 of the ring member 4 and can be positioned in the vertical direction. A tapered engagement male portion 11 which is formed in a regular polygon having a plurality of arcuate corner portions 11a and a plurality of side portions 11b whose horizontal cross section is convex outward, and a circular opening of the ring member 4; And a cylindrical portion 6b that can be inserted into 4c.

  The taper engagement male part 11 is formed integrally with the base member 6, and the inclination angle of the taper engagement male part 11 with respect to the vertical is preferably about 7 ° to 12 °. The horizontal cross section of the taper engaging male part 11 is formed in a regular octagon having eight arcuate corners 11a and eight side parts 11b protruding outward. The eight side portions 11b are each formed in a straight line. The taper engagement male portion 11 is located on the inner peripheral side from a conical surface that connects a ball 24 of eight ball lock mechanisms 15 described later and the center in the radial direction of the Z reference surface 10.

  As shown in FIG. 6, the base member 6 is fixed to the base plate 5 with a plurality of bolts 7. The Z reference surface 10 is formed in an annular shape with an opening angle of about 10 ° in plan view on the annular portion 6c outside the taper engaging male portion 11 on the upper surface of the base member 6, and the Z reference surface 10 is 8 portions are formed at equal intervals in the circumferential direction so as to correspond to the side portions 11b of the taper engaging male portion 11. A shallow annular groove 10 a is formed inside these Z reference planes 10.

  Seating confirmation nozzles 12 for jetting pressurized air are formed on a pair of Z reference planes 10 facing each other with the shaft center 6a interposed therebetween, and an air passage 12a for supplying the pressurized air to these seating confirmation nozzles 12 serves as a base member 6. And the base plate 5 are formed. The air passage 12a is connected to a pressurized air supply source and a pressure switch. The pressure switch detects a change in the air pressure in the air passage 12a, and the lower end reference surface 9 of the ring member 4 has four Z positions based on the change in the air pressure. It is confirmed that the user is seated on the reference plane 10.

Next, the ring member 4 will be described.
As shown in FIGS. 3 and 4, the ring member 4 has a vertical axis 4 b, an annular lower reference surface 9, and the lower reference surface 9 is in contact with the Z reference surface 10 of the base member 6. In this way, the taper engagement female formed into a regular polygon having a plurality of arcuate corners 13a and a plurality of side portions 13b that can be engaged with the taper engagement male part 11 from above and whose horizontal cross section is convex outward. Part 13. The taper engagement female portion 13 is engaged in close contact with the taper engagement male portion 11 through the elastic deformation of the outer peripheral side wall portion of the taper engagement female portion 13 in the diameter increasing direction.

  The taper engaging female portion 13 is formed integrally with the ring member 4. The horizontal section of the taper engagement female portion 13 is formed in a regular octagon having eight arcuate corner portions 13a and eight side portions 13b that protrude outward, and the taper engagement female portion 13 is reduced in diameter toward the top. Yes. The eight side portions 13b are each formed in a straight line. The ring member 4 is fixed to the pallet main body 1a by a plurality of bolts 4a. A shallow annular recess 9 a is formed in the lower surface portion of the ring member 4 inside the annular lower end reference surface 9. In addition, when the taper engagement male part 11 engages with the taper engagement female part 13 in close contact, the arcuate corner part 11a engages with the arcuate corner part 13a with a slight gap. It may be good or may be a structure engaged in close contact.

Next, the positioning mechanism 70 will be described.
The positioning mechanism 70 is provided on the base member 6 and the work pallet 1. A taper engagement male part 11 formed on the base member 6, a taper engagement female part 13 formed on the ring member 4 of the work pallet 1, and a Z reference surface 10 formed on the annular part 6c of the base member 6. And the lower end reference surface 9 formed on the ring member 4 of the work pallet 1, and the taper engagement male portion 11 and the taper engagement through elastic deformation in the diameter expansion direction of the outer peripheral side wall portion of the taper engagement female portion 13. When the mating portion 13 is engaged in close contact, the lower end reference surface 9 abuts on the Z reference surface 10, and the work pallet 1 is placed with high accuracy in the horizontal and vertical directions with respect to the base member 6. It is possible to position and constrain rotation about the vertical axis.

Next, the clamp mechanism 8 will be described.
As shown in FIGS. 5 and 6, the clamp mechanism 8 is for fixing the work pallet 1 to the base member 6 via the ring member 4, and the clamp mechanism 8 includes a clamping hydraulic cylinder 14, a base A ball lock mechanism 15 provided on the member 6 and the ring member 4 is provided. The clamping hydraulic cylinder 14 includes a cylinder bore 16 formed in the base plate 5 and the base member 6, a piston member 17 movably mounted on the cylinder bore 16 in the vertical direction, a hydraulic operation chamber 18 for releasing the clamp, A hydraulic pressure supply passage 19 connected to an external hydraulic pressure supply source via a hydraulic pressure supply / discharge hole 73, an annular spring accommodating chamber 20 formed in the piston member 17 and the base member 6, and the spring accommodating chamber 20 are mounted. The disc spring laminated body 21 in a compressed state is provided. A breathing air passage 22 connected to the spring accommodating chamber 20 is also formed.

  The ball lock mechanism 15 includes eight ball holding holes 23 formed in the cylindrical portion 6b of the base member 6, eight balls 24 (steel balls) that are movably mounted in the ball holding holes 23 in the radial direction, a ring Eight ball receiving grooves 25 formed so as to correspond to the eight ball holding holes 23 in the inner peripheral side portion of the upper end portion of the member 4, and the upper end portion of the piston rod 17a of the piston member 17 and the cylindrical portion 6b The disc member 26 is slidably fitted in the upper and lower directions, and eight ball drive inclined portions 27 are formed on the outer peripheral portion of the disc member 26 so as to correspond to the eight ball holding holes 23. And a recess 28 for retracting the ball. The eight ball holding holes 23 and the eight balls 24 are positioned so as to correspond to the central portions of the eight side portions 11 b of the taper engagement male portion 11.

  The ball receiving groove 25 is formed as an inclined partial cylindrical groove that can receive the lower end of the ball 24. The disc member 26 is fixed to the upper end portion of the piston rod 17 a by a nut member 29 with eight pairs of ball drive inclined portions 27 and ball retracting recess portions 28 corresponding to the eight ball holding holes 23. ing. The nut member 29 has a plurality of holes 29a for engaging the tool.

  In the state where the hydraulic pressure is supplied to the hydraulic working chamber 18 to hold the piston member 17 in the raised position and the eight balls 24 are partially retracted into the eight ball retracting recesses 28, the ring member 4 of the work pallet 1 is moved. When the hydraulic pressure in the hydraulic working chamber 18 is switched to the drain pressure after engaging the base member 6 from above, the piston member 17 is driven downward by the elastic force of the disc spring laminate 21. At the time of the lowering drive, as shown in FIG. 5, eight balls 24 are driven radially outward by the eight ball driving inclined portions 27 to engage with the eight ball receiving grooves 25, thereby To press downward, the ring member 4 is clamped to the base member 6 by the clamp mechanism 8. When the hydraulic pressure is supplied to the hydraulic working chamber 18 at the time of releasing the clamp, the piston member 17 is raised, and the eight balls 24 are partially retracted into the eight ball retracting recesses 28 and are released from the clamp.

Next, the air blow mechanism will be described.
An annular air chamber 30 is formed between the base member 6 and the disk member 26, and an air supply path 31 for supplying pressurized air to the air chamber 30 is formed. This air supply path 31 is formed in the base plate 5. The air passage 31 a and the air supply hole 74 are connected to a pressurized supply source, and pressurized air is supplied to the air chamber 30.

  Eight air supplied with pressurized air from the air chamber 30 in order to air blow foreign matter such as cutting chips between the lower end reference surface 9 and the Z reference surface 10 and between the lower end reference surface 9 and the base member 6. A passage 32 and a slit-like horizontal air nozzle 32 a that is continuous with the air passage 32 are formed. The horizontal air nozzle 32a is formed in a partial circular shape with a small thickness so as to blow air over the entire Z reference surface 10.

  In order to blow air between the taper engagement male part 11 and the taper engagement female part 13, eight air nozzles 33 connected to the air chamber 30 are formed at the lower end of the cylindrical part 6 b, and pressurized air is supplied from these air nozzles 33. When the ring member 4 is engaged with the base member 6 while jetting out, the narrow gap between the taper engagement male part 11 and the taper engagement female part 13 is strongly blown by air, and foreign matter such as cutting chips Is removed.

Next, four sets of positioning and clamping mechanisms 80 will be described. Since each positioning and clamping mechanism has the same structure, one set of positioning and clamping mechanisms 80 will be described.
As shown in FIG. 7, the positioning and clamping mechanism 80 includes a locate ring 75 attached to the work pallet 1, a support base 81 attached to the base plate 5, and a hydraulic cylinder 86 formed inside the support base 81. And the piston member 87 and the ball lock mechanism 90 provided on the piston member 87 and the locating ring 75, and the locating ring 75 can be positioned and fixed to the base plate 5 in the vertical direction.

  The locate ring 75 includes a tapered inner peripheral surface 75a formed at the lower end portion of the inner peripheral surface of the center hole of the locate ring 75, an annular lower end reference surface 75b formed at the lower end of the locate ring 75, and an inner portion of the center hole. And an annular receiving portion 75c formed at the upper end of the peripheral surface.

  The support base 81 includes a cylindrical portion 81 a fitted in the mounting hole 5 a of the base plate 5, and a disc portion 81 b that is connected to the upper end of the cylindrical portion 81 a and is fixed in contact with the upper surface of the base plate 5. The cylindrical portion 81b has a tapered cylindrical portion 81c extending upward, a Z-direction reference surface 81d formed on the upper surface of the disk portion 81b and receiving the lower end reference surface 75b, and a cylinder hole 81e.

  The outer peripheral surface of the taper cylinder part 81c is formed in the taper outer peripheral surface which becomes small diameter upwards. In a state where the lower end reference surface 75b is in contact with the Z-direction reference surface 81d, the tapered inner peripheral surface 75a is disposed with a gap on the outer side of the tapered outer peripheral surface of the tapered cylindrical portion 81c. A slight gap is formed between the inner peripheral wall of the locating ring 75 between the stopper portion 75c and the outer peripheral surface of the cylindrical portion 81f. Thereby, the locating ring 75 can be positioned with high accuracy in the vertical direction with respect to the support base 81 without interfering with the horizontal positioning by the positioning mechanism 70 of the central portion.

  The hydraulic cylinder 86 includes a piston member 87, a disc spring stacked body 88, and a hydraulic operation chamber 89. The piston member 87 is mounted in the cylinder hole 81e, and a stacked disc spring stacked body 88 is mounted in a compressed state in the annular spring accommodating chamber 87a to clamp the piston member 87 downward. A hydraulic working chamber 89 is formed on the lower surface side of the piston member 87, and an oil passage 5 b for supplying and discharging hydraulic pressure to the hydraulic working chamber 89 is formed in the base plate 5. To a hydraulic pressure supply source (not shown).

  The ball lock mechanism 90 includes a plurality of balls 91 (steel balls) movably mounted in the radial direction in a plurality of holding holes 81g of a cylindrical portion 81f extending upward from the upper end of the tapered cylindrical portion 81c, and a piston rod of the piston member 87. And a plurality of recesses 92 formed on the outer peripheral portion of the portion near the upper end of 87b. The recess 92 includes an inclined recess 92a for driving the ball 91 radially outward, and a retracting recess 92b connected to the lower end of the inclined recess 92a and partially retracting the ball 91 radially inward. Have.

  In the clamped state, the piston member 87 is pressed downward by the urging force of the disc spring laminated body 88, and each ball 91 is driven radially outward by the inclined recess 92a and pressed by the annular locking portion 75c to locate. 75 is clamped. In the unclamped state, the piston member 87 is advanced upward by the hydraulic pressure supplied to the hydraulic working chamber 89, and each ball 91 is partially retracted to the retracting recess 92b and does not protrude outside the outer peripheral surface of the cylindrical portion 81f. . In this unclamped state, the work pallet 1 can be moved upward. In addition, you may form the ditch | groove corresponding to each ball | bowl 91 instead of the cyclic | annular latching | locking part 75c.

  A plurality of air nozzles 96a and a plurality of air nozzles 96b are formed in order to air blow the chips adhering to the taper outer peripheral surface of the lower end reference surface 75b, the Z-direction reference surface 81d, the tapered inner peripheral surface 75a, and the tapered cylindrical portion 81c. The pressurized air can be supplied from the air passage 5c to the plurality of air nozzles 96b. Pressurized air can be supplied to the plurality of air nozzles 96 a through the air supply hole 74, the air passage 5 d, and the check valve 97.

  As described above, the plurality of clamp mechanisms 85 include the ball lock mechanism 90, the disc spring laminated body 88 for clamping the ball lock mechanism 90, and the hydraulic cylinder 86 for unclamping the ball lock mechanism 90. Therefore, when clamping, the ball lock mechanism 90 is clamped by the urging force of the disc spring laminated body 88, and when unclamping, the ball lock mechanism 90 is driven by the hydraulic pressure supplied to the hydraulic cylinder 86. Can be unclamped.

Next, the operation and effect of the positioning / fixing mechanism 2 will be described.
When the work pallet 1 to which the workpiece is fixed is positioned and fixed on the table of the machine tool, the ring is operated while the hydraulic pressure is supplied to the hydraulic working chamber 18 of the clamping mechanism 8 and the hydraulic working chamber 89 of the positioning and clamping mechanism 80. The member 4 is engaged with the base member 6, and the four locating rings 75 are engaged with the support bases 81 corresponding to the locating rings 75. At this time, it is performed while supplying pressurized air to the air chamber 30 and the plurality of air nozzles 96a and 96b.

  At this time, in the positioning mechanism 70, the ring member 4 and the base member 6 are engaged with each other in a state where the rotational phases around the axis are matched, and the taper engagement female portion 13 is lightly brought into contact with the taper engagement male portion 11. The lower end reference surface 9 of the ring member 4 is lightly brought into contact with the eight Z reference surfaces 10. In the positioning / clamping mechanism 80, the lower end reference surface 75b of the locating ring 75 is brought into a light contact with the Z-direction reference surface 81d.

  In this state, when the hydraulic pressure in the hydraulic working chambers 18 and 89 is switched to the drain pressure, the work pallet 1 is clamped to the base plate 5 as described above. The taper engagement female portion 13 is brought into close contact with the taper engagement male portion 11 through minute elastic deformation of the outer peripheral side wall portion, and the lower end reference surface 9 is brought into close contact with the Z reference surface 10, thereby positioning and clamping. In the mechanism 80, the lower end reference surface 75b is in close contact with the Z-direction reference surface 81d.

  The work pallet 1 is positioned with high accuracy in the vertical direction (Z direction) with respect to the base plate 5 by bringing the lower end reference plane 9 into close contact with the Z reference plane 10 and the lower end reference plane 75b into close contact with the Z direction reference plane 81d. can do. By bringing the taper engagement female portion 13 into close contact with the taper engagement male portion 11, the work pallet 1 can be positioned with high accuracy in the horizontal direction, and the vertical axis of the work pallet 1 with respect to the base member 6 can be positioned. The rotational phase can be positioned with high accuracy, and the work pallet 1 can be restrained from rotating about the axis with respect to the base member 6. In this way, the taper engagement male part 11 and the taper engagement female are not adjusted without fine adjustment of the height direction positions of the lower end reference surface 9 or the Z reference surface 10 and the lower end reference surface 75b or the Z direction reference surface 81d. Two-plane restraint can be reliably achieved without using a movable member in any of the portions 13.

  Since the base member 6 is attached to the central portion of the base plate 5, when the work pallet 1 is clamped, the support rigidity of the central portion of the base plate 5 is improved, and the elastic deformation of the central portion of the work pallet 1 is suppressed and cutting is performed. The processing accuracy can be improved. Since all of the positioning / clamping mechanisms 80 have the same structure, the design / manufacturing and inventory management of the positioning / clamping mechanism 80 are facilitated, and the manufacturing cost can be suppressed. Since the positioning mechanism 70 can position and rotate the work pallet 1 in the horizontal direction and the vertical direction with respect to the base plate 5 only at the center portion of the base plate 5, the mounting accuracy can be improved and the accuracy of cutting can be increased. it can.

  Since the horizontal cross section of the taper engagement male part 11 and the taper engagement female part 13 is a regular octagon having eight arc-shaped corner parts 11a, 13a and eight side parts 11b, 13b, it is a non-circular regular polygon. However, since the shape is close to a circle, there is very little wasted wall or space in the taper engaging male part 11 and the taper engaging female part 13, which is advantageous for downsizing the apparatus, and in terms of manufacturing cost. But it is advantageous.

  Since each of the eight side portions 11b of the taper engaging male portion 11 is formed in a straight line and each of the eight side portions 13b of the taper engaging female portion 13 is formed in a linear shape, the taper engaging male portion is formed. When the part 11 and the taper engagement female part 13 are engaged in close contact, the rotational restraining force can be improved by the linear shape of the eight side portions 11b.

  Since the taper engaging male portion 11 is located on the inner peripheral side of the conical surface connecting the plurality of balls 24 and the center of the Z reference surface 10 in the radial direction, the ring member 4 is engaged with the base member 6 and clamped. In doing so, a force that presses the eight side portions 13b of the taper engaging female portion 13 toward the inner peripheral side acts, so that the outer peripheral side wall portion of the eight side portions 13b of the taper engaging female portion 13 increases in the diameter increasing direction. The eight side portions 13b can be brought into close contact with the eight side portions 11b.

  In the ball lock mechanism 15, the eight ball holding holes 23 and the plurality of balls 24 are positioned so as to correspond to the central portions of the plurality of side portions 11 b of the taper engagement male portion 11. When clamping, the eight side portions 13 b of the taper engagement female portion 13 are pressed against the eight side portions 11 b of the taper engagement male portion 11, and the taper engagement female portion 13 is brought into close contact with the taper engagement male portion 11. Can be made.

  When the ring member 4 is engaged with the base member 6 and clamped by the clamp mechanism 8, pressurized air is supplied to the air chamber 30, and pressurized air is ejected from the eight horizontal air nozzles 32 a to form the lower end reference surface 9 and Z. Since the reference surface 10 is air blown, foreign matter such as chips is not caught between them. Similarly, pressurized air is ejected from the eight air nozzles 33 and air is blown between the taper engagement male part 11 and the taper engagement female part 13, and therefore, between the taper engagement male part 11 and the taper engagement female part 13. It does not bite foreign matter such as chips. Since air is blown at a wide angle from the horizontal air nozzle 32a toward the entire area of the Z reference plane 10, the air blowing action can be improved.

  When releasing the clamp by the clamp mechanism 8 and the positioning / clamp mechanism 80, as described above, the hydraulic pressure is supplied to the hydraulic working chambers 18 and 89, and the eight balls 24 are placed in the ball retracting recess 28 in four sets. The ball 91 can be retracted into the ball retracting recess 92b, the upper end of the piston rod 17a is brought into contact with the upper end wall surface of the circular recess 1b of the work pallet 1, and the upper end of the piston member 87 is pushed upward. When the pallet 1 is brought into contact with the upper end wall surface of the circular recess 1c and pushed upward, the engagement between the taper engagement female portion 13 and the taper engagement male portion 11 is separated, and the clamp can be released.

  In the clamp state, in the ball lock mechanism 15, the ball 24 is received in an arc contact state by the ball receiving groove 25, and the ring member 4 is not easily indented by the ball 24, and durability is improved. In addition, since they are engaged with the eight ball receiving grooves 25, it is possible to restrain the work pallet 1 from rotating about the axis with respect to the base member 6.

  In addition, the disc member 26 is provided at the upper end of the piston rod 17a of the clamp mechanism 8, and the eight ball driving inclined portions 27 and the ball retracting recess 28 are formed on the outer peripheral portion of the disc member 26. Most of 17a can be reduced in diameter, and hydraulic cylinder 14 can be reduced in size and weight. Since the air chamber 30 is formed by effectively using the disk member 26, the configuration of the air supply path for air blowing can be simplified.

The following various modifications may be applied to the positioning and fixing mechanism 2.
[1] As shown in FIG. 8, the taper engagement male portion 11 is a taper engagement male portion having a small axial length, and is formed on the taper engagement male portion corresponding to the lower end portion of the ring member 4A. Has been.
[2] As shown in FIGS. 9 and 10, the base member 6 is fixed with a pair of vertical positioning pins 40 positioned symmetrically with respect to the axis 6a, and the ring member 4B has positioning pins 40. A pair of pin holes 41 to be inserted are formed. A cone-shaped taper portion 40 a is formed at the upper end portion of the positioning pin 40. By fitting these positioning pins 40 into the pin holes 41, the rotational phase around the axis of the work pallet 1A relative to the base member 6 is correctly positioned.

  Therefore, when the taper engagement female portion 13 of the ring member 4B is engaged with the taper engagement male portion 11 of the base member 6, the plurality of arc-shaped corner portions 13a of the taper engagement female portion 13 are tapered engagement male portions. The rotational phase can be adjusted to match the plurality of arcuate corner portions 11a of the portion 11. In addition, since the taper engagement female portion 13 cannot be engaged with the taper engagement male portion 11 in a state where the rotation phase is not matched, the taper engagement female portion generated by engaging with the rotation phase inconsistent. 13 and the taper engagement male part 11 can be prevented from being damaged. A plurality of pairs of positioning pins 40 and a pair of pin holes 41 may be provided.

[3] As shown in FIGS. 11 and 12, for the same purpose as the above [2], the vertical center of the base plate 5 located symmetrically with respect to the axis 6a of the base member 6 is provided at the center of both left and right ends. A pair of positioning pins 42 is fixed, and a pair of notch holes 43 into which the pair of positioning pins 42 engage is formed in the work pallet 1B. A taper portion 42 a is formed at the upper end portion of the positioning pin 42. Since the notch hole 43 penetrates to the upper end of the work pallet 1B, it is advantageous in aligning the pair of notch holes 43 with the pair of positioning pins 42. A pin hole may be formed instead of the notch hole 43, or a pair of positioning pins 42 and a plurality of pairs of notch holes 43 may be provided.
[4] As shown in FIG. 13, in order to hold the work pallet 1C with an arm member of an ATC (automatic tool changer), a holding groove 44 having a trapezoidal cross section is formed on the outer periphery of the ring member 4C. .

[5] As shown in FIGS. 14 and 15, the ring member 4 </ b> D of the work pallet 4 </ b> D has a taper engagement female portion 13 when the taper engagement female portion 13 is engaged in close contact with the taper engagement male portion 11. It has the elastic deformation promotion part 50 which accelerates | stimulates the elastic deformation to the diameter expansion direction of the outer peripheral side wall part. The elastic deformation promoting portion 50 includes eight arc-shaped grooves 51 having a circular arc shape in a plan view formed in a shape of a lower end opened in a wall portion surrounding the taper engaging female portion 13. Between the circular arc grooves 51 adjacent to the circular arc groove 51, a rib wall 53 having a length in the circumferential direction that is approximately half the circumferential length of the circular arc groove 51 is formed. An annular wall 52 is formed.

  When the taper engagement female portion 13 is engaged with the taper engagement male portion 11 in close contact, the eight rib walls 53 and the annular wall 52 are engaged in close contact via elastic deformation in the diameter increasing direction. It can be positioned accurately in the horizontal direction. The rib wall 53 is formed at a circumferential position corresponding to a regular octagonal arcuate corner in the horizontal cross section. The number of arc grooves 51 is not limited to eight, and may be less than eight, or nine or more.

  As described above, since the elastic deformation promoting portion 50 is provided, when the taper engagement female portion 13 is closely engaged with the taper engagement male portion 11, the diameter of the wall portion surrounding the taper engagement female portion 13 is increased. Elastic deformation in the direction can be promoted. In addition, the rigidity and elastic deformability of the eight rib walls 53 and the annular wall 52 can be set appropriately by appropriately setting the ratio of the total length of the plurality of rib walls 53 to the entire circumference. Excellent flexibility.

  As shown in FIGS. 16 and 17, as the elastic deformation promotion portion 50 </ b> A partially changed from the elastic deformation promotion portion 50, the ring member 4 </ b> E of the work pallet 4 </ b> E of the first example surrounds the taper engagement female portion 13. Eight arc grooves 54 having an arc shape in a plan view formed in an open shape at the upper end are provided in the wall portion. Between the arc groove 54 and the adjacent arc groove 54, a rib wall 55 having a circumferential length approximately half the circumferential length of the arc groove 54 is formed, and a certain degree of rigidity is provided inside the eight arc grooves 54. An annular wall 55 is formed. A lower wall 56 having a thickness similar to that of the annular wall 55 is formed below the eight arc grooves 54.

  As shown in FIG. 18, as the elastic deformation promoting portion 50 </ b> B partially changed from the elastic deformation promoting portion 50, in the ring member 4 </ b> F of the second example, the taper engagement female portion 13 is in close contact with the taper engagement male portion 11. The elastic deformation promoting portion 50B that promotes the elastic deformation of the outer peripheral side wall portion of the taper engaging female portion 13 when engaged in a shape. The elastic deformation promoting portion 50B includes an annular groove 57 having a lower end open shape formed in a wall portion surrounding the taper engaging female portion 13. The cross-sectional shape of the annular groove 57 is a rectangular shape having a small radial width. Between the taper engagement female portion 13 and the annular groove 57, an annular wall 58 is formed which can be elastically deformed in the diameter increasing direction and has a certain degree of rigidity.

As shown in FIG. 19, the elastic deformation promoting portion 50 </ b> C obtained by partially changing the elastic deformation promoting portion 50 is formed on the annular wall 58 in addition to the annular groove 57 in the ring member 4 </ b> G of the third example. A plurality of (for example, two or four) notch portions 59 are formed.
As shown in FIG. 20, as the elastic deformation promoting portion 50 </ b> D in which the elastic deformation promoting portion is partially changed, the ring member 4 </ b> H of the fourth example includes a plurality of grooves formed on the annular wall 58 in addition to the annular groove 57. (For example, eight) slits 60 are formed.

As shown in FIG. 21, as the elastic deformation promoting portion 50 </ b> E in which the elastic deformation promoting portion 50 is partially changed, the ring member 4 </ b> I of the fifth example has an inner circumferential side of the annular groove 57 in addition to the annular groove 57. A plurality of (for example, eight) rectangular opening holes 62 formed in the annular wall 58 are formed.
As shown in FIG. 22, as the elastic deformation promoting portion 50 </ b> F obtained by partially changing the elastic deformation promoting portion 50, the ring member 4 </ b> J of the sixth example has a circumferential direction on the wall portion surrounding the taper engaging female portion 13. A plurality of (for example, eight) slits 63 in the radial direction formed at appropriate intervals are formed.

  As shown in FIG. 23, an annular groove 64 having a triangular cross section is formed in the ring member 4K of the seventh example as an elastic deformation promoting part G in which the elastic deformation promoting part 50 is partially changed. An annular wall 65 is formed inside the annular groove 64. Note that a fitting cylinder portion 66 is formed on the upper surface portion of the ring member 4K so as to protrude into a circular concave portion having a large diameter of the work pallet. Further, the ring member 4K may be configured by omitting the outer peripheral side wall portion of the annular groove 64.

[6] FIG. 24 is a plan view of the base member 6A. In the base member 6A of the first example shown in FIG. 24, eight arcuate corner portions 11aA in which the horizontal section of the taper engaging male portion 11A is convex outward. And eight side portions 11bA slightly bulging outward. The eight side portions 11bA are curved in an arc shape with a small curvature. The taper engaging female portion of the ring member (not shown) is formed in a shape that closely engages with the taper engaging male portion 11A through elastic deformation in the diameter increasing direction of the ring member.

  Since the taper engagement male part 11A and the taper engagement female part are formed in a regular octagonal shape in the horizontal cross section, since it is a regular polygon and a shape close to a circle, the waste of the wall and the waste of space are very much. Therefore, it is advantageous in reducing the size of the apparatus, and in terms of manufacturing cost. When engaged in close contact, the contact area of the side portion 11bA increases, the ring member can be centered with high accuracy, and centripetality can be improved.

  FIG. 25 is a plan view of the base member 6B. In the base member 6B of the second example shown in FIG. 25, the horizontal cross section of the taper engaging male portion 11B is convex outward and outward. It is formed in a regular hexagon having six side portions 11bB that are slightly swollen. The six side portions 11bB are curved in an arc shape with a small curvature. The taper engaging female portion of the ring member (not shown) is formed in a shape that closely engages with the taper engaging male portion 11B through elastic deformation in the diameter increasing direction of the ring member.

  Since the taper engagement male part 11B and the taper engagement female part are formed in a regular hexagonal shape in the horizontal cross section, the regular polygonal shape is close to a circle, so the waste of the wall and the waste of space are extremely high. Therefore, it is advantageous in reducing the size of the apparatus, and in terms of manufacturing cost. When engaging closely, the contact area between the side portions increases, the ring member can be centered with high accuracy, and centripetality can be improved.

  FIG. 26 is a plan view of the base member 6C. In the base member 6C of the third example shown in FIG. 26, the horizontal cross section of the taper engagement male portion 11C protrudes outward and four arcuate corner portions 11aC. It is formed in a regular tetragon having four side portions 11bC that are slightly swollen. The four side portions 11bC are curved in an arc shape with a small curvature. The taper engagement female portion of the ring member (not shown) is formed in a shape that closely engages with the taper engagement male portion 11C through elastic deformation in the diameter expansion direction of the ring member.

  Since the taper engagement male part 11C and the taper engagement female part are formed in a regular quadrangle in the horizontal cross section, they are a regular polygon and a shape close to a circle. Therefore, it is advantageous in reducing the size of the apparatus, and in terms of manufacturing cost. When engaging closely, the contact area between the side portions increases, the ring member can be centered with high accuracy, and centripetality can be improved.

  FIG. 27 is a plan view of the base member 6D. In the base member 6D of the fourth example shown in FIG. 27, the horizontal section of the taper engagement male portion 11D is linear with the six arc-shaped corner portions 11aD protruding outward. Are formed in a regular hexagonal shape having six side portions 11bD. The taper engagement female portion of the ring member (not shown) is formed in a shape that closely engages with the taper engagement male portion 11D through elastic deformation of the ring member in the diameter increasing direction. Since each of the six side portions 11bD is formed in a straight line shape, the rotation restraining force can be improved by the linear shape of the six side portion 11bD when engaged in close contact.

  FIG. 28 is a plan view of the base member 6E. In the base member 6E of the fifth example shown in FIG. 28, the horizontal section of the taper engagement male portion 11E is linear with four arcuate corner portions 11aE protruding outward. Are formed in a regular square shape having four side portions 11bE. The taper engaging female portion of the ring member (not shown) is formed into a shape that closely engages with the taper engaging male portion 11E through elastic deformation in the diameter increasing direction of the ring member. Since each of the four side portions 11bE is formed in a linear shape, the rotational restraining force can be improved by the linear shape of the four side portions 11bE when engaging closely.

[7] As shown in FIG. 29, the flat plate member 26A is slidably disposed on the inner side of the cylindrical portion 6b and is integrally formed with a rod portion 26a extending downward from the central portion. is there.
On the outer peripheral portion of the flat plate member 26 </ b> A, eight sets of ball driving inclined portions 27 and ball retracting recess portions 28 formed so as to correspond to the eight ball holding holes 23 are provided. The lower portion of the rod portion 26a is screwed to the central portion of the piston member 17 with eight pairs of ball driving inclined portions 27 and ball retracting recess portions 28 corresponding to the eight ball holding holes 23. . An annular air chamber 30 is formed between the disk member 26 </ b> A and the base member 6.

Next, a positioning and fixing mechanism 2L according to a second embodiment that is a partial modification of the first embodiment will be described with reference to FIGS. 30 to 32. The same reference numerals are given to the same components as those of the preceding embodiment. A description thereof will be omitted, and only different components will be described.
As shown in FIGS. 30 and 31, the taper engaging male portion 11L formed on the base member 6L has eight arcuate corner portions 11aL and eight side portions 11bL, and the side portions 11bL in these horizontal cross sections. Each has a relief recess 35 formed in the center thereof, and a pair of engagement contact portions 36 formed on both sides of the relief recess 35.

  The taper engaging female portion 13L formed on the ring member 4L of the work pallet 2L has eight convex arc-shaped corner portions 13aL and eight side portions 13bL, and each of the side portions 13bL in the horizontal cross section, It has a relief recess 38 formed in the center thereof, and a pair of engagement contact portions 39 formed on both sides of the relief recess 38. In addition, the side part here shows the part of the range A in FIG. 32, and an arc-shaped corner part shows the part of the range B in FIG.

  The relief recess 35 of the tapered engagement male portion 11L is formed in a shallow groove shape along the vertical direction on the tapered surface of the base member 6L. The relief recess 38 of the tapered engagement female portion 13L is formed in a shallow groove shape along the vertical direction on the tapered surface of the ring member 4L. Each of the relief recesses 35 and 38 is formed in a region that is about ½ of the side portions 11bL and 13bL. The pair of engagement contact portions 36 and the pair of engagement contact portions 39 opposite to the pair are formed so as to be in a parallel state.

  When this taper engagement male part 11L is engaged with the taper engagement female part 13L, a slight gap is provided between the arcuate corner part 11aL and the arcuate corner part 13aL, while the taper engagement female part 13L Engage in close contact via elastic deformation of the outer peripheral side wall. At this time, the pair of engagement contact portions 36 and the pair of engagement contact portions 39 are engaged in close contact, so that the number of contact locations is doubled compared to the first embodiment, and the horizontal direction is increased. Positioning accuracy and rotational restraint force are improved.

  Further, since the relief recess 35 is provided in the side portion 11bL and the relief recess 38 is provided in the side portion 13bL, the compressive stress of the pair of engagement contact portions 36 and 39 is increased, so that the outer periphery of the taper engagement female portion 13L is increased. The side wall portion facilitates minute elastic deformation in the diameter increasing direction, and the inner periphery of the taper engaging male portion 11L promotes minute elastic deformation in the diameter reducing direction at the wall portion, thereby improving adhesion. . Further, in the present embodiment, it is not necessary to polish the surfaces of the relief recesses 35 and 38 as compared to precisely polishing the entire tapered surfaces of the taper engaging male part 11 and the taper engaging female part 13. Therefore, the polishing cost can be reduced. Other configurations, operations, and effects are the same as those in the first embodiment.

Next, a partial modification of the side portions 11bL and 13bL of the present embodiment will be described.
As shown in FIG. 33, in the side portions 11bM and 13bM of the first example, the pair of engagement contact portions 36A and 39A are formed in a tapered shape so as to approach the other side as they approach the escape recesses 35 and 38. ing.
As shown in FIG. 34, in the side portions 11bN and 13bN of the second example, the pair of engagement contact portions 36B and 39B are formed in a tapered shape that approaches the other side as the distance from the escape recesses 35 and 38 increases. .

As shown in FIG. 35, in the side portion 11bL of the third example, the relief recess 35 and the pair of engagement contact portions 36 are formed only in the taper engagement male portion 11L, and the pair of engagement contact portions 36 are It forms so that it may become parallel to the linear side part 13b of the taper engagement female part 13 which opposes.
As shown in FIG. 36, in the side portion 11bM of the fourth example, the relief recess 35 and the pair of engagement contact portions 36A are formed only in the taper engagement male portion 11M, and the pair of engagement contact portions 36A are It is formed in a tapered shape so as to approach the counterpart side as it approaches the escape recess 35.

As shown in FIG. 37, in the side portion 11bN of the fifth example, the relief recess 35 and the pair of engagement contact portions 36B are formed only in the taper engagement male portion 11N, and the pair of engagement contact portions 36B are It is formed in a tapered shape so that it is closer to the other side as it is farther from the escape recess 35.
As shown in FIG. 38, in the side portion 13bL of the sixth example, the relief recess 38 and the pair of engagement contact portions 39 are formed only in the taper engagement female portion 13L, and the pair of engagement contact portions 39 are It forms so that it may become parallel to the side part 11b of the taper engagement male part 11 which opposes.

As shown in FIG. 39, in the side portion 13bM of the seventh example, the relief recess 38 and the pair of engagement contact portions 39A are formed only in the taper engagement female portion 13M, and the pair of engagement contact portions 39A are It is formed in a taper shape so as to approach the other side as it approaches the escape recess 38.
As shown in FIG. 40, in the side portion 13bN of the eighth example, the relief recess 38 and the pair of engagement contact portions 39B are formed only in the taper engagement female portion 13N, and the pair of engagement contact portions 39B are It is formed in a tapered shape so that it is closer to the other side as it is farther from the escape recess 38.

Next, a positioning and fixing mechanism 2R according to a third embodiment that is a partial modification of the first embodiment will be described with reference to FIGS. 41 to 44. The same reference numerals are used for the same components as those in the preceding embodiment. A description thereof will be omitted, and only different components will be described.
As shown in FIGS. 41 and 42, the base member 6R has the clamping mechanism 8 of the first embodiment omitted, and has an upper end formed on a perfectly circular flat surface. The base member 6R is formed with a taper engagement male portion 11R having a smaller diameter toward the upper side. The taper engagement male portion 11R has eight arcuate corner portions 11aR whose horizontal cross section protrudes outward and eight linear portions. And a side portion 11bR.

  As shown in FIGS. 43 and 44, the ring member 4R of the work pallet 2R is formed with a taper engagement female portion 13R by omitting the ball lock mechanism 15 of the clamp mechanism 8 of the first embodiment. The base member 6R and the ring member 4R are formed with a lower overall height than that of the first embodiment. The taper engaging female portion 13R has eight arc-shaped corner portions 13aR whose horizontal cross section is convex outward and eight straight side portions 13bR. The shapes of the taper engagement male portion 11R and the taper engagement female portion 13R can be the various shapes of the first and second embodiments.

  When the work pallet 2R is positioned and clamped with respect to the base plate 5, the ring member 4R is positioned in the horizontal direction and the vertical direction with respect to the base member 6R and restrains rotation around the vertical axis to The positioning and clamping mechanism 80 is positioned and clamped in the vertical direction. Since the positioning and fixing mechanism 2R omits the clamp mechanism 8, the structure of the ring member 4R and the base member 6R is simplified and can be easily manufactured, so that the manufacturing cost can be suppressed. Other configurations, operations, and effects are the same as those in the first embodiment.

  A clamp mechanism 108 applicable instead of the clamp mechanism 8 of the first embodiment will be described. As shown in FIGS. 45 and 46, the clamp mechanism 108 includes a clamp hydraulic cylinder 114 and a ball lock mechanism 115. The base member 106 is provided at the center portion of the base plate 5 and receives the lower end reference surface 109 of the ring member 104 and can be positioned in the vertical direction, the eight arcuate corner portions 111a and the eight side portions. The taper engagement male part 111 is formed in a regular octagon having 111 b and the diameter is reduced toward the upper side, and a cylindrical part 106 a that can be inserted into the opening of the ring member 104.

  The ring member 104 includes an annular lower end reference surface 109 and a taper engagement female portion 113 formed in a regular octagon having eight arcuate corner portions and eight side portions. The taper engagement female portion 113 is engaged with the taper engagement male portion 111 in a close contact manner through elastic deformation of the outer peripheral side wall portion of the taper engagement female portion 113 in the diameter increasing direction. As the shape of the taper engagement female portion 113, the above-described various shapes can be applied. Further, the arcuate corner portion of the taper engaging female portion 113 may engage with the arcuate corner portion 111a with a slight gap. It is desirable that the thickness of the ring member 104 in the radial direction is made small so that the ring member 104 is easily elastically deformed when being fixed to the base member 106.

  The hydraulic cylinder 114 includes an annular piston member 117 and a bottom cover member 131 that forms part of the hydraulic working chamber 118. The annular piston member 117 has an annular piston portion 117a and an annular piston rod 117b extending upward from the annular piston member 117a. The upper portion of the annular piston rod 117b is fitted into the cylindrical portion 106a so as to be slidable in the vertical direction. Yes. A plurality of ball driving inclined portions 127 and a plurality of ball retracting recesses 128 are formed on the outer peripheral portion of the annular piston rod 117b so as to correspond to the plurality of ball holding holes 123 for holding the plurality of balls 124.

  The bottom cover member 131 includes a central tube portion 131a that is inserted into the annular piston portion 117a of the annular piston member 117 and has a through hole 135 at the center, and a bottom wall portion 131b that closes the bottom portion of the hydraulic operation chamber 118, and has a central tube portion. 131 a and the bottom wall 131 b are integrally formed, and the bottom cover member 131 is fixed to the base member 106. An annular spring accommodating chamber 133 is formed between the cylindrical portion 131a of the bottom cover member 131, the annular piston 117, and the annular member 126. The annular piston 117 is elastically attached to the spring accommodating chamber 133 in the clamping direction (downward). The disc spring laminated body 120 of the compression state for energizing is accommodated.

  An annular member 126 that closes the upper end of the spring accommodating chamber 133 is provided on the upper outer peripheral portion of the central cylindrical portion 131a of the bottom cover member 131, and the nut member 129 is screwed into the cylindrical portion 131a from above the annular member 126. Thus, the annular member 126 is fixed. A hydraulic working chamber 118 is formed between the bottom lid member 131 and the annular piston portion 117a. A plug member 136 is detachably attached to the upper end portion of the through hole 135 that passes through the central cylindrical portion 131a of the bottom cover member 131. For example, when a sensor or switch is provided on the work pallet, the plug member 136 is removed, and the hose and electric cables introduced into the through hole from below are guided to the work pallet.

  An annular space 140 is formed in the gap between the upper inner circumferential surface of the base member 106 and the outer circumferential surface of the annular piston rod portion 117b. When the taper engagement female portion 113 is engaged with the taper engagement male portion 111 by the annular space 140, the taper engagement is accompanied by the elastic deformation of the outer peripheral side wall portion of the taper engagement female portion 113 in the direction of minute diameter expansion. The taper engagement female portion 113 engages with the taper engagement male portion 111 in a close contact manner through elastic deformation of the inner peripheral side wall portion of the merger portion 111 in the diameter reduction direction. The upper end portion of the annular space 140 may be extended and communicated with the ball holding hole 123.

  When the work pallet 101 to which the workpiece is fixed is positioned and fixed on the table of the machine tool, the ring pallet 104 and the base member 106 are engaged with each other in a state in which the rotational phases around the axial centers coincide with each other. The portion 113 is lightly brought into contact with the taper engaging male portion 111. With the lower end reference surface 109 of the ring member 104 slightly in contact with the eight Z reference surfaces 110, the hydraulic pressure in the hydraulic working chamber 118 is switched to the drain pressure. The ring member 104 is clamped to the base member 106, and the ring member 104 is elastically deformed in the direction of minute diameter expansion of the outer peripheral side wall portion of the taper engagement female portion 113 and the taper engagement male of the base member 106. Through the elastic deformation of the inner peripheral side wall portion of the portion 111 in a minute diameter reduction direction, the base member 106 comes into close contact with the lower end reference surface 109 into close contact with the Z reference surface 110.

  By bringing the lower end reference surface 109 into close contact with the Z reference surface 110, the center portion of the work pallet 101 can be positioned with high accuracy in the vertical direction (Z direction). By bringing the taper engagement female portion 113 into close contact with the taper engagement male portion 111, the center portion of the work pallet 101 can be positioned with high accuracy in the horizontal direction, and the vertical axis of the work pallet 101 with respect to the base member 106. The rotational phase around the center can be positioned with high accuracy, and the work pallet 101 can be restrained from rotating about the axis relative to the base member 106.

  The upper part of the annular piston rod 117a of the hydraulic cylinder 114 is fitted into the cylindrical part 131a so as to be slidable vertically, and a plurality of balls formed on the outer peripheral part of the annular piston rod 117a so as to correspond to the plurality of ball holding holes 125. Since the drive inclined portion 127 and the plurality of ball retracting recesses 128 are provided, a through hole 135 can be provided in the vicinity of the axial center of the annular piston member 117. Therefore, a hose, an electric signal cable, or the like can be used using the through hole 135. It can be inserted and space can be used effectively. Other configurations, operations, and effects are the same as those in the first embodiment.

  A clamp mechanism 8A applicable instead of the clamp mechanism 8 of the first embodiment will be described. As shown in FIG. 47, the clamp mechanism 8A includes a clamp hydraulic cylinder 164A and a ball lock mechanism 165A. A flange 157a of the pull stud 157 is sandwiched between the pallet main body 151a and the locking portion 154a of the ring member 154A, and the pull stud 157 is fixed. A plurality of balls 174 are held in a plurality of ball holding holes 173 formed in the distal end cylindrical portion 167b of the rod portion 167a, and a recess 178 and a smaller diameter are formed in the inner peripheral side portion of the tapered annular portion 156a of the base member 156. A tapered surface 177 is formed.

  At the time of clamping, when the hydraulic pressure in the oil chamber 168 is switched to the drain pressure, the piston member 167 is driven downward by the elastic force of the disc spring laminated body 171, and the plurality of balls 174 are driven radially inward by the tapered surface 177 to pull the pull stud 157. The pull stud 157 is pressed downward (see the left half of FIG. 47). When releasing the clamp, the hydraulic pressure is supplied to the oil chamber 168 to raise the piston member 167, and the plurality of balls 174 are partially retracted into the recess 178 to release the clamp (see the right half portion of FIG. 47). Other configurations, operations, and effects are the same as those in the first embodiment.

  A clamp mechanism 8B applicable instead of the clamp mechanism 8 of the first embodiment will be described. As shown in FIG. 48, in the clamp mechanism 8B, the tapered annular portion 156a of the base member 156A is omitted, and the recess 178 and the tapered surface 177 of the ball lock mechanism 165B are formed on the inner peripheral side portion of the ring member 154B. ing. At the time of clamping, when the piston member 167 is driven downward, the plurality of balls 174 press the pull stud 157 and the tapered surface 177 downward through the plurality of ball holding holes 173 (see the left half portion of FIG. 48). At the time of releasing the clamp, the piston member 167 is raised, the plurality of balls 174 are partially retracted into the recesses 178, and the clamp is released (see the right half of FIG. 48). Other configurations, operations, and effects are the same as those in the first embodiment.

  A clamp mechanism 8C applicable instead of the clamp mechanism 8 of the first embodiment will be described. As shown in FIG. 49, the clamp mechanism 8C includes a clamp hydraulic cylinder 164C and a ball lock mechanism 165C. A tapered surface 187 b is formed on the inner peripheral side of the tip of the cylindrical rod portion 187 a of the piston member 187. The ball holding member 166 fixed to the base member 156C with a bolt has a cylindrical portion 166a in which a plurality of ball holding holes 173 are formed.

  At the time of clamping, the piston member 187 is driven upward by the disc spring laminate 171 and the taper surface 187b drives the plurality of balls 174 radially inward to form the head of the pull stud 157C integrally formed on the work pallet 151C. Engage with. When releasing the clamp, hydraulic pressure is supplied to the annular oil chamber 185 to lower the piston member 187 so that the plurality of balls 174 can be retracted into the annular space 175 on the distal end side of the rod portion 187a, and the clamp is released. Other configurations, operations, and effects are the same as those in the first embodiment.

  A clamp mechanism 8D applicable instead of the clamp mechanism 8 of the first embodiment will be described. As shown in FIG. 50, the clamp mechanism 8D includes a clamp hydraulic cylinder 164D and a lock mechanism 188 that employs a plurality of engagement pins 189 instead of the plurality of balls 174. At the time of clamping, the plurality of engaging pins 189 are driven radially inward by the tapered surface 187b and engaged with the head of the pull stud 157D. At the time of releasing the clamp, the piston member 187 is lowered, the plurality of engaging pins 189 can be retracted into the annular space 175, and the clamp is released. Other configurations, operations, and effects are the same as those in the first embodiment.

  A clamp mechanism 8E applicable instead of the clamp mechanism 8 of the first embodiment will be described. As shown in FIG. 51, the clamping mechanism 8E includes a clamping hydraulic cylinder 164E and a collet mechanism 190. During clamping, the head portion 191b of the rod portion 192a of the piston member 192 presses the base portions 191a of the plurality of collets 191 downward, and the distal end portion 191b of the collet 191 is radially inward by the upper end portion of the inner peripheral side wall portion of the base member 159. To engage the head of the pull stud 157E. At the time of releasing the clamp, the rod portion 192a presses the base portion 191a upward, the relief groove 191c of the collet 191 engages with the upper end portion of the inner peripheral side wall portion, and the clamp is released. Other configurations, operations, and effects are the same as those in the first embodiment.

A clamp mechanism 8F applicable instead of the clamp mechanism 8 of the first embodiment will be described. As shown in FIG. 51, the clamp mechanism 8F includes a diaphragm mechanism 195.
The diaphragm 196 is composed of a metal plate having a thickness of about 1 mm, and is disposed in the internal space 156b of the base member 156F, and its outer peripheral portion is fixed to the base member 156F. At the time of clamping, a plurality of engaging members 197 provided at equal intervals at the center of the upper surface of the diaphragm 191 are engaged with the head of the pull stud 157F. When releasing the clamp, pressurized air is supplied to the air chamber 198, and the diaphragms 196 are elastically deformed upward, whereby the tip portions of the plurality of engaging members 197 move outward, and the clamp is released. Other configurations, operations, and effects are the same as those in the first embodiment.

Next, a modified example in which the above embodiment is partially modified will be described.
[1] The shape of the base plate 5 is not limited to a rectangular shape, but may be a polygonal shape in plan view. In this case, a plurality of positioning and clamping mechanisms 80 may be mounted so as to correspond to each corner of the polygonal shape. Further, the shape of the base plate 5 may be formed in a circular shape in plan view. In this case, a plurality of positioning and clamping mechanisms 80 may be mounted at equal intervals on the circular outer periphery.
[2] The inner peripheral side wall portion of the taper engagement male portion 11 may be configured to closely contact the taper engagement female portion 13 through elastic deformation in the diameter reduction direction, or the taper engagement. The wall portions of both the male portion 11 and the taper engaging female portion 13 may be elastically deformed to engage closely.
[3] The taper engagement female portion 13 may be formed directly on the pallet main body 1a with the ring member 4 omitted, and the elastic deformation promoting portions 50 having various shapes may be directly formed on the pallet main body 1a. good.
[4] The number of the ball lock mechanisms 15 may be changed as appropriate according to the regular polygonal shape of the taper engagement male portion 11.
[5] In addition, those skilled in the art can implement the present invention by adding various modifications without departing from the spirit of the present invention, and the present invention includes such modifications. is there.

It is a perspective view by the side of the base member of the positioning fixing mechanism which concerns on Example 1 of this invention. It is a top view by the side of the base member of a positioning fixing mechanism. It is a perspective view by the side of the ring member of a positioning fixing mechanism. It is a top view by the side of the ring member of a positioning fixing mechanism. It is sectional drawing of a work pallet and a base member. It is sectional drawing of a work pallet and a base member. It is sectional drawing of a work pallet and a positioning and clamp mechanism. It is sectional drawing of the base member of the 1st modified form which concerns on Example 1. FIG. It is a top view of the ring member and base member of a 2nd modification. It is sectional drawing of a work pallet and a base member. It is a principal part enlarged plan view of the work pallet of the 3rd change form. It is a principal part expanded sectional view of a work pallet and a base board. It is sectional drawing of the work pallet and base member of a 4th modification. It is a top view of the ring member and base member of a 5th modification. It is sectional drawing of a work pallet and a base member. It is a top view of the 1st modification of a ring member and a base member. It is sectional drawing of the 1st modification of a work pallet and a base member. It is sectional drawing of the 2nd modification of a ring member. It is sectional drawing of the 3rd modification of a ring member. It is sectional drawing of the 4th modification of a ring member. It is sectional drawing of the 5th modification of a ring member. It is sectional drawing of the 6th modification of a ring member. It is sectional drawing of the 7th modification of a ring member. It is a top view of the 1st modification of a base member of the 6th modification. It is a top view of the 2nd modification of a base member. It is a top view of the 3rd modification of a base member. It is a top view of the 4th modification of a base member. It is a top view of the 5th modification of a base member. It is sectional drawing of the work pallet and base member of a 6th modification form. FIG. 6 is a perspective view of a base member side of a positioning and fixing mechanism according to a second embodiment. It is a perspective view by the side of the ring member of a positioning fixing mechanism. It is a principal part expanded sectional view of the side part of a taper engagement male part and a taper engagement female part. It is a principal part expanded sectional view of the side part of the 1st modification of the taper engagement male part and taper engagement female part which concern on the change form of Example 2. FIG. It is a principal part expanded sectional view of the 2nd modification of the side part of a taper engagement male part and a taper engagement female part. It is a principal part expanded sectional view of the 3rd modification of the side part of a taper engagement male part and a taper engagement female part. It is a principal part expanded sectional view of the 4th modification of the side part of a taper engagement male part and a taper engagement female part. It is a principal part expanded sectional view of the 5th modification of the side part of a taper engagement male part and a taper engagement female part. It is a principal part expanded sectional view of the 6th modification of the side part of a taper engagement male part and a taper engagement female part. It is a principal part expanded sectional view of the 7th modification of the side part of a taper engagement male part and a taper engagement female part. It is a principal part expanded sectional view of the 8th modification of the side part of a taper engagement male part and a taper engagement female part. 10 is a perspective view of a base member side of a positioning and fixing mechanism according to Embodiment 3. FIG. It is a top view by the side of the base member of a positioning fixing mechanism. It is a perspective view by the side of the ring member of a positioning fixing mechanism. It is a top view by the side of the ring member of a positioning fixing mechanism. FIG. 10 is a cross-sectional view of a main part of a positioning and fixing mechanism according to a fourth embodiment. It is a top view of a base member. FIG. 10 is a cross-sectional view of a main part of a positioning and fixing mechanism according to a fifth embodiment. FIG. 10 is a cross-sectional view of a main part of a positioning and fixing mechanism according to a sixth embodiment. FIG. 10 is a cross-sectional view of a main part of a positioning and fixing mechanism according to a seventh embodiment. FIG. 10 is a cross-sectional view of a main part of a positioning / fixing mechanism according to an eighth embodiment. It is principal part sectional drawing of the positioning fixing mechanism which concerns on Example 9. FIG. FIG. 10 is a cross-sectional view of a main part of a positioning and fixing mechanism according to a tenth embodiment.

Explanation of symbols

1, 1A to 1E, 1L, 1R Work pallet 2, 2L, 2R Positioning and fixing mechanism 4, 4A to 4K, 4L, 4R Ring member 5 Base plate 6, 6A to 6E, 6L, 6R Base member 8, 8A to 8F Clamp Mechanism 9 Lower end reference surface 10 Z reference surface 11, 11A to 11E, 11L to 11N, 11R Taper engagement male part 11a, 11aA to 11aE, 11aL, 11aR Arc-shaped corner part 11b, 11bA to 11bE, 11bL to 11bN, 11bR side Portions 13, 13L to 13N, 13R Taper engaging female portions 13a, 13aL, 13aR Arc-shaped corner portions 13b, 13bL to 13bN, 13bR Side portion 14 Clamping hydraulic cylinder 15 Ball lock mechanism 17 Piston member 18 Hydraulic working chamber 23 Ball holding Hole 24 Ball 25 Ball receiving groove 26, 26A Disk member 27 Ball drive Inclined portion 28 Recessed recesses 35, 38 Escape recesses 36, 36A, 36B, 39, 39A, 39B Engagement contact portions 50, 50A to 50G Elastic deformation promoting portion 70 Positioning mechanism 75 Locate ring 80 Positioning and clamping mechanism 90 Ball lock mechanism

Claims (16)

The work pallet has a base plate to which the work pallet can be attached and detached from above, positions the work pallet in the vertical direction and the horizontal direction with respect to the base plate, and rotates around the vertical axis with respect to the base plate of the work pallet. In the work pallet positioning and fixing mechanism that restrains and fixes the work pallet to the base plate,
An annular base member attached to the central portion of the base plate so as to partially protrude from the upper surface of the base plate;
A positioning mechanism that is mounted on the base member and the work pallet and is capable of positioning the work pallet in a horizontal direction and a vertical direction with respect to the base member;
A plurality of positioning and clamping mechanisms which are respectively provided at a plurality of positions on the outer peripheral side of the positioning mechanism of the base plate and capable of positioning and fixing the work pallet in the vertical direction with respect to the base plate;
A work pallet positioning and fixing mechanism characterized by comprising: The base plate is formed in a polygonal shape in plan view,
2. The work pallet according to claim 1, wherein the plurality of positioning and clamping mechanisms are respectively provided between a plurality of corner portions of the base plate and an outer peripheral portion of the base member facing the corner portions. Positioning and fixing mechanism. The positioning mechanism includes a taper engagement male part that is reduced in diameter toward an upper part provided on the base member, and a taper engagement female part provided on the work pallet,
The taper engagement male part is formed in a regular polygon having a plurality of arcuate corners and a plurality of side parts whose horizontal cross section is convex outward,
The taper engaging female portion is formed in a regular polygon having a plurality of arcuate corner portions and a plurality of side portions whose horizontal cross section is convex outward,
The taper engagement female part is in close contact with the taper engagement male part through elastic deformation in the radial direction of at least one of the outer peripheral side wall part of the taper engagement female part and the inner peripheral side wall part of the taper engagement male part. The work pallet positioning / fixing mechanism according to claim 1, wherein the work pallet positioning / fixing mechanism is configured to engage with the work pallet.   The positioning mechanism includes a Z reference surface formed in an annular portion of the base member, and a lower reference surface formed on the work pallet and abutting against the Z reference surface, and the tapered engagement male portion and the taper 4. The work pallet positioning and fixing mechanism according to claim 3, wherein the Z reference surface abuts on the lower end reference surface when the engaging female portion is in a close contact state.   5. The work pallet positioning and fixing mechanism according to claim 4, wherein the work pallet has a ring member fixed to the work pallet, and the taper engagement female portion is formed on the ring member.   4. The work pallet positioning and fixing mechanism according to claim 3, wherein each of the plurality of side portions in the horizontal cross section of the tapered engagement male portion is formed in an arc shape slightly bulging outward.   4. The work pallet positioning and fixing mechanism according to claim 3, wherein each of the plurality of side portions in the horizontal cross section of the taper engaging male portion is formed in a straight line shape.   Each of the plurality of side portions in the horizontal cross section of the taper engaging female portion has an escape recess formed in the central portion thereof and a pair of engagement contact portions formed on both sides of the escape recess. The work pallet positioning and fixing mechanism according to claim 3.   Each of the plurality of side portions in the horizontal cross section of the taper engagement male portion has an escape recess formed at the center thereof and a pair of engagement contact portions formed on both sides of the escape recess. The work pallet positioning fixing mechanism according to claim 3 or 8.   The positioning and clamping mechanism includes a ball lock mechanism, a disc spring laminated body for clamping the ball lock mechanism, and a hydraulic cylinder for unclamping the ball lock mechanism. Item 2. A work pallet positioning and fixing mechanism according to Item 1. A clamp mechanism is provided for fixing the center portion of the work pallet to the base member.
2. The work pallet positioning and fixing mechanism according to claim 1, wherein the clamp mechanism includes a clamping hydraulic cylinder provided on the base member, and a ball lock mechanism provided on the base member and the work pallet.   The ring member promotes elastic deformation that promotes elastic deformation in a diameter-enlarging direction when a plurality of side portions of the taper engaging female portion are closely engaged with a plurality of side portions of the taper engaging male portion. 6. The work pallet positioning and fixing mechanism according to claim 5, further comprising a portion.   The said elastic deformation promotion part is provided with several circular arc-shaped groove | channels by arc shape by planar view formed in the wall part surrounding the said taper engagement female part at the lower end open shape. Work pallet positioning and fixing mechanism.   13. The elastic deformation promoting portion includes a plurality of arc-shaped arc grooves formed in a plan view formed in an open upper end on a wall portion surrounding the tapered engagement female portion. Work pallet positioning and fixing mechanism.   3. The work pallet positioning / fixing mechanism according to claim 2, wherein the base plate is formed in a rectangular shape in plan view, and four sets of positioning / clamping mechanisms are provided.   16. The work pallet positioning / fixing mechanism according to claim 15, wherein the diameter of the base member is formed to be 1/3 to 1/2 of the smaller width of the base plate.