JP4614113B2 - Machine tool pallet and manufacturing method thereof - Google Patents

Description

  The present invention relates to a pallet for carrying a workpiece onto a table of a machine tool, positioning and fixing the workpiece, and carrying the workpiece from the table and transporting it to a predetermined place, and a method for manufacturing the pallet.

In machine tools such as machining centers, in order to eliminate wasted time, multiple pallets are prepared, and while cutting the workpiece attached to the pallet positioned and fixed on the table inside the machine, The next workpiece is set up on another pallet at a setup station or the like, and the pallet to which the workpiece is attached by the setup is loaded onto the table by an automatic pallet changer, and the pallet having the cut workpiece is removed from the table. It is known to carry it out and carry it to a predetermined place such as a pallet stocker (for example, see Patent Documents 1 and 2).
JP 62-162440 A JP-A-11-333649

  The pallet serves as a reference for mounting workpieces and jigs outside the machine, and is an important part for accurately positioning the workpiece on the table and obtaining workpiece machining accuracy. And a small variation in accuracy among a plurality of pallets. In order to satisfy this requirement, conventionally, after a steel pallet material is cut with high-precision processing equipment, the processed product must be fine-tuned and finished by skilled workers. There was a problem that could not be produced efficiently. In addition, the iron pallet is inconvenient because it has a large mass, requires not only a large amount of power for conveyance, but also when stored in a warehouse-type pallet stocker as a work mounting jig, In addition to being limited in terms of mass, the amount of load was subject to rust and oil burns when left for a long period of time, which deteriorated the accuracy of mounting to the table and the processing accuracy of the workpiece during use.

The present invention has been made in view of the above circumstances, is lightweight, has excellent damping properties, and does not have to worry about rust or oil burning even when left for a long period of time, and can be reused without problems in accuracy. It is an object of the present invention to provide a machine tool pallet and a manufacturing method thereof.
Another object of the present invention is to provide a method for manufacturing a pallet for a machine tool that can repeatedly manufacture a pallet with uniform accuracy without requiring machining or fine adjustment.

The present invention is characterized by the following points in order to solve the above problems.
That is, a pallet for a machine tool according to claim 1 includes a pallet main body made of polymer concrete, a plurality of female screw insert members embedded in an upper portion of the pallet main body with screw holes opened on the upper surface of the pallet main body, and a pallet main body. Has a positioning hole that fits into a positioning member on the table when it is carried into the table of the machine tool, the positioning hole is opened on the lower surface of the pallet body, and a plurality of embedded holes are embedded in the lower part of the pallet body. And a positioning hole insert member.

The method for manufacturing a pallet for a machine tool according to claim 2 is to manufacture a pallet for a machine tool by pouring a polymer concrete in a fluid state from a material introduction port into a molding space of the pallet body formed inside the mold and curing it. In the way to
In the molding space of the mold, a plurality of female screw insert members are held in one of the upper and lower portions, with the openings of the screw holes facing the outside of the molding space, and on the other side, a plurality of positioning members. The hole insert member is characterized in that the openings of the positioning holes are held toward the outside of the molding space.

  A method for manufacturing a pallet for a machine tool according to claim 3 is the method for manufacturing a pallet according to claim 2, wherein the pallet main body is fitted on the mold when the pallet main body is carried into the table of the machine tool. The positioning fixing mechanism is the same as the positioning fixing mechanism, and the positioning hole insert member is fitted to the positioning fixing mechanism and fixed to the mold.

  The pallet manufacturing method for a machine tool according to claim 4 is the pallet manufacturing method according to claim 2 or 3, wherein the female screw insert member is screwed into a bolt inserted through the screw hole from the mold side. It is characterized by being fixed to the mold.

  The pallet manufacturing method for a machine tool according to claim 5 is the pallet manufacturing method according to any one of claims 2 to 4, wherein the mold has a material introduction hole formed in an upper portion thereof and an upper surface of the pallet in a lower portion thereof. After the mold surface for the pallet upper surface is formed and the flowing polymer concrete is poured into the molding space, a pressure piston is inserted into the material introduction hole, and the fluid polymer concrete in the molding space is inserted. It is characterized by pressurization.

The present invention has the following excellent effects.
That is, according to the pallet of the machine tool according to claim 1, since the pallet is mainly composed of polymer concrete, it is lightweight and easy to handle, and the power required for the pallet transport device to transport the pallet is reduced. be able to. Also, as a pallet with excellent damping properties and mounted on a table close to the cutting point of the machine tool, the effect of absorbing cutting vibration is generated, and chatter vibration and the like can be reduced in boring processing and spot facing processing on the machine tool. . Furthermore, there is no worry of rust and oil burning, and good surface quality can be ensured over a long period of time.

  According to the method for manufacturing a pallet of a machine tool according to claim 2, since the pallet is manufactured by pouring fluid polymer concrete into a mold forming space and curing it, the molding surface of the mold is polymer concrete. Thus, it is possible to repeatedly produce a pallet product with uniform accuracy without performing machining and subsequent adjustment work unlike a conventional iron pallet.

  According to the pallet manufacturing method for a machine tool according to claim 3, the positioning hole insert member is positioned and held in the molding space of the mold by the same positioning fixing mechanism as the positioning fixing mechanism on the table of the machine tool. Therefore, the consistency of the positioning hole insert member embedded in the molded pallet with the positioning fixing mechanism on the table is improved, and the pallet loaded on the table of the machine tool is positioned on the table with high accuracy. It can be fixed, and the machining accuracy of the workpiece can be increased.

  According to the method for manufacturing a pallet for a machine tool according to claim 4, the female screw insert member is fixed to the mold with a bolt using a screw hole provided therein, and a special means is provided in the molding space. It can be easily held without using it.

  According to the method for manufacturing a pallet for a machine tool according to claim 5, by pressing the polymer concrete in a flow state in the molding space with a pressurizing piston, the polymer concrete is It is possible to form the upper surface, which is the work mounting surface of the product pallet, with higher accuracy by transferring it to the mold surface for the pallet upper surface at the bottom of the mold.

Hereinafter, a method for manufacturing a pallet for a machine tool according to an embodiment of the present invention will be described with reference to the accompanying drawings. First, an example of a mold used for carrying out a method for manufacturing a pallet for a machine tool according to an embodiment of the present invention will be described with reference to FIGS.
1 to 10, reference numeral 1 denotes a mold for casting a pallet by pouring polymer concrete in a fluid state. The mold 1 includes a rectangular lower mold 3 fixed to a rectangular base plate 2 with bolts 2a, and a front portion disposed along the center of the front side of the lower mold 3 (lower side in FIGS. 6 and 7). A side mold 4, a rear side mold 5 disposed along the entire length of the rear side of the lower mold 3 (upper side in FIGS. 6 and 7), and a left side block 6 disposed on the left side of the front side mold 4. Along the right side block 7 disposed on the right side of the front side mold 4 and the left side of the lower mold 3 between the rear side mold 5 and the left side block 6 (left side in FIGS. 6 and 7). A left side mold 8 disposed between the rear mold 5 and the right block 7 along the right side of the lower mold 3 (the right side in FIGS. 6 and 7). A rectangular upper mold 10 placed on the front and rear side molds 4 and 5, left and right side blocks 6 and 7, left and right side molds 8 and 9; Placed on the rectangular cone locator base and a (positioning member mounting plate) 11.

  The lower mold 3 has an upper surface (inner surface) 3a that is a mold surface that forms the upper surface of the pallet, and the front side mold 4 and the right side surface on the outer surfaces of the front side and the right side (lower side and right side in FIGS. 6 and 7). Reference surfaces 3b and 3c serving as a reference for attachment to the lower mold 3 of the mold 9 are formed. A pair of first positioning plates 12 and 12 are attached to the front reference surface 3b of the lower mold 3 on both end sides (left and right ends in FIGS. 2, 6, and 7) by bolts 12a and 12a, respectively. In addition, a pair of second positioning plates 13 and 13 are attached to the right reference surface 3c by bolts 13a and 13a on both ends thereof (upper and lower ends in FIGS. 6 and 7, and left and right ends in FIG. 3), respectively. ing.

  The front side surface mold 4 is formed in an inverted L shape in cross section, with the upper surface side of the flange 4a facing the inner side of the mold 1, and the outer surface of the front side surface mold 4 being the reference surfaces 12b, 12b of the first positioning plates 12, 12. The lower surface is in contact with the upper surface 3a of the lower mold 3, and is fixed to the lower mold 3 with bolts 14 and is fixed to the first positioning plates 12 and 12 with bolts 12a. Protruding portions 4c and 4c that slightly protrude toward the rear side mold 5 side of the mold 1 are provided on the left and right ends of the inner surface 4b of the flange 4a, and the inclined surfaces that the rear side mold 5 side greatly expands on the inner edges thereof. 4d and 4d are formed.

  The left and right side blocks 6 and 7 are each formed in a quadrangular prism shape, the lower end of which is in contact with the upper surface 3a of the lower mold 3 and the front outer surface thereof is the reference surface 12b of the first positioning plate 12. Are fixed to the upper surface 3a of the lower mold 3 by bolts 14 and fixed to the first positioning plate 12 by bolts 12a. The lower half of the left and right side blocks 6, 7 at the corners located inside the mold 1 have inclined surfaces 6a, 7a that are cut out at approximately 45 degrees, and the lower surface 6b of the notch is the front side surface. The lower surface 4e of the flange 4a of the mold 4 is flush with the lower surface 4e. The end portions of the inclined surfaces 6 a and 7 a on the front side mold 4 side are continuous with both end portions of the lower inner surface 4 f of the front side mold 4.

  The rear side mold 5 is formed in a shape in which the left and right side blocks 6 and 7 are integrally joined to both ends of the front side mold 4 and fixed to the upper surface 3a of the lower mold 3 by bolts 14. Corresponding to the flange 4a of the front side mold 4, the inner surface 4b of the flange, the inclined surface 4d, the lower surface 4e, the lower inner surface 4f and the inclined surfaces 6a, 7a of the left and right side blocks 6, 7, 5a, an inner surface 5b of the flange, an inclined surface 5d, a lower surface 5e, a lower inner surface 5f, and inclined surfaces 5g and 5g are provided. Further, the rear side mold 5 is fixed to the second positioning plate 13 by a bolt 13a with the right end thereof being in contact with the positioning surface 13b of the second positioning plate 13.

The left side mold 8 is configured by combining the upper mold member 16 on the lower mold member 15 and fitting the protrusions 15a and the recesses 16a to overlap each other. Are brought into contact with the upper surface 3a of the lower mold 3, and both end portions (upper and lower ends of FIGS. 4 and 6) are brought into contact with the rear side mold 5 and the left side block 6 and are lowered by bolts 14. 3 is fixed. The lower mold member 15 is formed with an inner surface 15 b along the left side of the lower mold 3 by connecting both ends to the inclined surface 6 a of the left side block 6 and the inclined surface 5 g of the rear side mold 5.
The upper die member 16 forms a flange 16b protruding toward the inside of the mold 1 above the lower die member 15 in the same manner as the flanges 4a and 5a of the front side die 4 and the rear side die 5. The inner surface 16c along the left side of the lower mold 3 and inclined surfaces 16d, 16d connected to the inclined surfaces 4a, 5d of the front side surface mold 4 and the rear side surface mold 5 are provided at both ends thereof. The upper mold member 16 has recesses 16f protruding from the inner surface 15b of the lower mold member 15 to the outside of the mold 1 and recessed from the lower surface 16e on both ends.

  In addition, the right side mold 9 has a lower mold member 17 and an upper mold member 18 that fit the protrusions 17a and the recesses 18a in the same manner as the upper and lower mold members 15 and 16 of the left side mold 8. These outer end portions (the right end portion in FIGS. 6 and 7) are brought into contact with the reference surface 13b of the positioning plate 13 and fixed to the positioning plate 13 with bolts 13a. At the same time, both end portions (upper and lower end portions in FIGS. 3 and 6) are brought into contact with the rear side surface mold 5 and the right side surface block 7, and the lower surface of the lower mold member 17 is connected to the upper surface 3a of the lower mold 3. Abutted and fixed to the lower mold 3 by bolts. The upper and lower mold members 18 and 17 on the right side mold 9 also have an inner surface 15b of the lower mold member 15 of the left side mold 8, a flange 16b, an inner surface 16c, an inclined surface 16d, a lower surface 16e of the upper mold member 16, Similarly, an inner surface 17b, a flange 18b, an inner surface 18c, an inclined surface 18d, a lower surface 18e, and a recess 18f are formed at positions respectively facing the recess 16f.

The lower mold 3 includes the inner surfaces 4f and 5f of the front and rear side molds 4 and 5 and the left, the inclined surfaces 6a and 7a of the right surface measuring blocks 6 and 7, and the inclined surfaces 5g and 5g of the rear surface mold 5 and the left. A plurality (24 in the illustrated example) of female screw insert members 19 are provided over substantially the entire area surrounded by the inner surfaces 15b and 17b of the lower mold members 15 and 17 of the right molds 8 and 9. The upper and lower surfaces of the lower mold 3 are vertically fixed to the upper surface 3a of the lower mold 3 by mounting bolts 20 that are arranged vertically and horizontally and are inserted into the bolt holes from the lower surface of the lower mold 3.
As shown in FIG. 8, the female screw insert member 19 is provided with annular grooves 19b and 19c near the upper end and the outer periphery of the lower end of the hexagonal column-shaped insert main body 19a, and a screw hole opened at the lower end on the center axis. 19d, the lower end of which is seated in the recess 21 at the upper end of the bolt hole of the lower die 3 and the upper surface of the ring 22 is in contact with the upper surface 3a of the lower die 3. The mounting bolt 20 is screwed into the hole 19d.

  Similarly, the front side mold 4 has the female screw insert member 19 at the same height position from the upper surface 3a of the lower mold 3 in the longitudinal direction of the front side mold 4 (left and right direction in FIG. 7). A plurality (two in the illustrated example) are arranged at a predetermined interval, and are fixed perpendicularly to the inner surface 4f toward the rear surface mold 5 side. Similarly, in the right side mold 9, the female screw insert member 19 is disposed at the same height position from the upper surface 3 a of the lower mold 3 in the longitudinal direction of the front right side mold 9 (vertical direction in FIG. 7). A plurality of (four in the illustrated example) are arranged at predetermined intervals, and are fixed perpendicularly to the inner surface 17b toward the left side surface mold 8 side.

  The upper mold member 18 of the right mold 9 has a recess 18f on the right block 7 side (the lower end side in FIG. 6) and is located closer to the inner side than the inner surface 17b of the lower mold member 17. A pin 23 is fixedly provided. As shown in FIG. 9, the upper end of the pin 23 is fitted into a hole 18h provided in the lower surface 18g of the recess 18f of the upper mold member 18, and a screw hole 23a opened at the upper end provided on the central axis thereof. Further, the bolt 24 inserted into the bolt hole from the upper surface of the upper mold member 18 is screwed to be provided perpendicular to the lower surface 18g (the inner surface 3a of the lower mold 3). Similarly, the pin 23 is also provided in the recess 16f on the rear side mold 5 side in the upper mold member 16 of the left side mold 8.

Further, the recesses 16f and 18f on the rear side mold 5 side of the upper mold members 16 and 18 of the left and right molds 8 and 9 are outside the inner surfaces 15b and 17b of the lower mold members 15 and 17, respectively. A pin 25 having a diameter smaller than that of the pin 23 is fixed to the upper die members 16 and 18 in the same manner as the pin 23 at a position close to the pin 23.
The upper die 10 and the cone locator base 11 are provided with circular material introduction holes 10a, 11a at the center thereof, and are superposed on each other and integrally assembled by a bolt 26, and together by a through bolt 26. The front side mold 4, the rear side mold 5, and the left and right side molds 8 and 9 are fixed to the upper mold members 16 and 18. The lower surface (inner surface) 10b of the upper mold 10 is provided with the pin 23 fixed in a similar manner at a symmetrical position in FIGS.

Furthermore, the upper mold 10 and the cone locator base 11 are provided with flanges 4a and 5a of the front and rear side molds 4 and 5, and flanges 16b and 18b of the upper mold members 16 and 18 of the left and right side molds 8 and 9, respectively. A cone locator (positioning hole insert member) 27 and a positioning cone (positioning member) 28 are provided at positions corresponding to the four corners of the quadrangular region surrounded by the inner surfaces 4b, 5b, 16c and 18c, respectively. Yes.
As shown in FIG. 10, the cone locator 27 is formed in a bottomed cylindrical shape with notches 27a and 27a provided on both sides of the outer peripheral portion in the middle in the axial direction, and the upper portion is open. Are fitted into mounting holes 10c provided at positions corresponding to the four corners. The upper end of the opening of the cone locator 27 is formed as an upwardly expanding tapered hole (positioning hole) 27b, and an upper tapered hole 27c is formed below the tapered hole 27c so as to communicate with the tapered hole 27c. The bottom is a bottomed hole 27d having a diameter larger than the large diameter portion of the tapered hole 27c.

  As shown in FIG. 10, the positioning cone 28 is formed in a cylindrical shape having a flange 28 a on the outer periphery of the intermediate portion, and the upper cylindrical portion 28 b is positioned at positions corresponding to the four corners of the cone locator base 11. The upper mold 10 is fitted to a cylinder 11b provided with its axis aligned with the mounting hole 10c, and is attached to the lower surface 11c of the cone locator base 11 by means of a bolt 29 through the flange 28a. Further, a tapered shaft portion 28c having a constriction aligned with the tapered hole 27b of the cone locator 27 is provided below the flange 28a of the positioning cone 28, and a cylindrical shape continuing below the tapered shaft portion 28c. A plurality of ball holes 28e are formed on the outer peripheral portion of the portion 28d in the diametrical direction at intervals in the circumferential direction.

  A piston rod 30 in which an upper end piston 30a is fitted to the cylinder 11b is inserted into the shaft hole 28f of the positioning cone 28 so as to be movable in the axial direction. A lower tapered side of the piston rod 30 is provided with a tapered portion 30b that is narrowed and an annular groove 30c that communicates with the tapered portion 30b, and the balls 31 inserted into the respective ball holes 28e are engaged with the tapered portion 30b and the annular groove 30c. Are combined. The piston rod 30 is always urged upward via a piston 30a by a compression spring 32 mounted in a large-diameter hole 28g on the upper end side of the shaft hole 28f of the positioning cone 28. A pressure oil supply hole 11 d communicating with the upper end of the cylinder 11 b is provided on the upper surface of the cone locator base 11.

  The positioning cone 28, the piston rod 30, the ball 31, the compression spring 32, the cylinder 11b, and the like constitute a positioning fixing mechanism for positioning and fixing the cone locator 27 to the positioning cone 28. After inserting the cylindrical portion 28d of the positioning cone 28 into the bottomed hole 27d of the cone locator 27 and fitting the tapered shaft portion 28c into the tapered hole 27b, the pressure is supplied from the pressure oil supply hole 11d of the cone locator base 11. When oil is supplied to the cylinder 11b and the piston 30 is pushed down, the ball 31 is pushed outward from the ball hole 28e by the taper portion 30b of the piston 30, and the ball 31 is pushed against the taper hole 27c. The cone locator 27 is positioned and fixed to the positioning cone 28 by bringing the tapered hole 27b into close contact with the tapered shaft portion 28c. Note that the release of the positioning and fixing of the cone locator 27 with respect to the positioning cone 28 is performed by stopping the supply of pressure oil to the cylinder 11b. In that case, the piston rod 30 is released from the pressure by the pressure oil, and is lifted by the urging force of the compression spring 32, the ball 31 is drawn into the annular groove 30c, and the engagement of the ball 31 with the tapered hole 27c. , So that the positioning cone 28 can be pulled out of the cone locator 27.

The positioning and fixing mechanism is the same as the mechanism for positioning and fixing the pallet to the table of the machine tool and is conventionally known. However, instead of this configuration, a positioning and fixing mechanism of another configuration may be adopted. it can.
Further, on the upper surface of the cone locator base 11, a pressurizing piston 33 for inserting the piston portion 33a into the material introduction holes 10a, 11a of the upper die 10 and the cone locator base 11 is provided by bolts 34 through the flange portion 33b. It is detachably fixed. A screw hole 33c is provided in the center of the upper surface of the pressurizing piston 33 to connect the pressurizing piston 33 to the pulling means.

Next, as described above, the lower mold 3, the front and rear mold surfaces 4 and 5, the left and right front blocks 6 and 7, the left and right molds 8 and 9, and the upper mold 10 A method for producing a pallet for a machine tool by pouring polymer concrete in a fluid state into the molding space P of the enclosed mold 1 will be described with reference to FIG.
In FIG. 11, reference numeral 35 denotes a mixer. The polymer tank 38 and the hardener tank 39 are connected to each other via pipes 36 and 37 having pumps 36a and 37a on the inlet side, and an aggregate inlet 35a on the inlet side. In addition, an aggregate tank 41 is communicated via a conveyor 40 such as a belt conveyor. The mold 1 fixed to the vibrator 42 is disposed below the outlet 35b of the mixer 35.

  In order to manufacture a pallet, for example, a polymer 38a such as an epoxy resin is accommodated in the polymer tank 38, a curing agent 39a that works to cure the polymer 38a is accommodated in the curing agent tank 39, and the aggregate tank 41 is also accommodated. For example, an aggregate 41a obtained by finely pulverizing granite, quartz sand, gravel, etc. is accommodated, and the mixer 35, pumps 36a, 37a, and conveyor 40 are operated. Thus, the polymer 38a and the curing agent 39a are supplied into the mixer 35 through the pipes 36 and 37 by the pumps 36a and 37a, and the aggregate 41a is supplied from the aggregate input port 35a into the mixer 35 by the conveyor 40. . The ratio of the material supplied into the mixer 35 is, for example, 10% by weight of the polymer 38a, 5% of the curing agent 38a, and 85% by weight of the aggregate 41a.

  The polymer 38a, the curing agent 39a, and the aggregate 41a supplied into the mixer 35 are uniformly mixed over a predetermined time to be generated as a polymer concrete 42 in a fluid state (slurry), and are discharged from the outlet 5b. The pressurizing piston 33 is poured into the molding space P through the material introduction holes 10a and 11a of the mold 1 from which the cone locator base 11 is removed, for example, for about 1 to 1.5 hours. During this time, the vibrator 42 is operated to vibrate the mold 1, so that the polymer concrete in the fluidized state reaches every corner in the molding space P of the mold 1. When the fluidized polymer concrete is filled in the molding space P of the mold 1 and rises to the material introduction port 10a of the upper mold 10, the supply of the polymer concrete from the mixer 35 to the mold is stopped. Then, the piston portion 33 a of the pressurizing piston 33 is inserted into the cone locator base 11 and the material introduction holes 11 a and 10 a of the upper mold 10, and the flange portion 33 b of the pressurizing piston 33 is connected to the cone locator base 11 by the bolt 34. By tightening, the polymer concrete in a fluid state in the molding space P is pressurized and left undisturbed for about 24 hours by the piston portion 33a.

  Thereby, the polymer concrete in a fluid state is hardened by the action of the hardener, and a pallet made of solid polymer concrete is formed in the molding space P. Thereafter, the hydraulic pressure applied to the pressurizing piston 30 in the cylinder 11 b of the cone locator base 11 is released, the connection between the positioning cone 28 and the cone locator 27 is released, and the positioning plates 12 and 13 are moved to the mold 1. After removing from the mold, the mold 1 is disassembled in a predetermined order. At this time, by removing the bolts 20 and 24 from the screw holes 19d of the female screw insert member 19 and the screw holes 23a of the pins 23 and 25, the female screw insert member 19, the pins 23 and 25, and the cone locator 27 are formed. It remains embedded in a hardened polymer concrete pallet.

  The polymer concrete pallet 43 produced in this way is composed of an upper surface 43a of the pallet formed by the upper surface 3a of the lower mold 3 of the mold 1 and the front and rear side molds 4, as shown in FIG. 5 of the inner surfaces 4f and 5f of the left and right side blocks 6 and 7 and the inclined surfaces 5g and 5g of the rear side mold 5 and of the lower mold members 15 and 17 of the left and right side molds 6 and 7. The outer peripheral surface 43b formed by the inner surfaces 15b and 17b and having four corners cut out, the lower surfaces 4e and 5e of the front and rear surface molds 4 and 5, and the upper mold member 16 of the left and right surface molds 8 and 9. , 18 and upper and lower surfaces 43d formed by the lower surfaces 6b, 7b of the left and right side blocks 6, 7, respectively. Further, the lower surface 43e of the pallet formed integrally with the lower surface 10b of the upper mold 10 of the mold 1 and the flanges 4a and 5a of the front and rear side molds 4 and 5 are formed on the lower side of the upper plate 43d. Four corners formed by the inner surfaces 4b and 5b and the inclined surfaces 5d and 5d and the inner surfaces 16c and 18c of the flanges 16b and 18b and the inclined surfaces 16d and 18d of the upper mold members 16 and 18 of the left and right side surface molds 8 and 9, respectively. A rectangular lower plate 43g having a cutout outer peripheral surface 43f and smaller than the upper plate 43d is provided. Further, the outer peripheral surfaces of the two opposite sides are formed at the four corners of the upper plate 43d and the lower plate 43g by the recesses 16f and 18f in the upper mold members 16 and 18 of the left and right side molds 8 and 9 of the mold 1. A protruding portion 43h protruding outward from 43b and 43f is formed.

The pallet body 43i composed of the upper board 43d, the lower board 43g, and the protrusion 43h has screw holes 19d on the upper surface 43a of the upper board 43d and two outer peripheral surfaces 43b adjacent to the upper surface 43a. The female screw insert member 19 opened in the outer peripheral surface 43b is embedded, and the cone locator 27 is embedded in the four corners of the lower surface 43e of the lower plate 43g with its lower end protruding from the lower surface 43e. . Further, pins 23 and 25 are embedded in the diagonal positions of the projecting portion 43h and the symmetrical position of the lower surface 43e of the lower board 43g, with their screw holes 23a opened to the outside, respectively.
The screw hole 19d of the female screw insert member 19 opened on the upper surface 43a of the upper board 43d is used for screwing a bolt for fixing a work mounting jig or the like on the pallet main body 43i. The screw hole 19d of the female screw insert member 19 opened on the outer peripheral surface 43b of 43d fixes a positioning member or the like for positioning the workpiece and the workpiece mounting jig in two directions at right angles on the pallet main body 43i. Used to screw bolts.

  As described above, the pallet 43 of the machine tool according to the embodiment is embedded in the upper part of the pallet main body 43i with the pallet main body 43i made of polymer concrete and the screw holes 19d opened in the upper surface 43a of the pallet main body 43i. A plurality of female screw insert members 19 and a taper hole (positioning hole) 27b that fits into a positioning cone (positioning member) on the table when the pallet main body 43i is carried into the table of the machine tool. A hole 27b is opened in the lower surface 43e of the pallet main body 43i, and a plurality of cone locators (positioning hole insert members) 27 embedded in the lower portion of the pallet main body 43i are provided.

  Therefore, according to the pallet of the machine tool according to the embodiment, since the pallet 43 is mainly composed of polymer concrete, the pallet 43 is light in weight and reduced to about 1/3 compared to a conventional iron pallet. Therefore, handling is easy, the power required for the pallet conveying device to convey the pallet can be reduced, and the amount stored in the pallet stocker or the like can be increased. Compared to conventional cast iron pallets, the damping performance is about 8 to 10 times better, and as a pallet mounted on a table close to the cutting point of the machine tool, the effect of absorbing cutting vibration is generated, and boring processing on the machine tool. And chatter vibrations can be reduced during spot facing. Furthermore, there is no worry of rust and oil burning, and good surface quality can be ensured over a long period of time.

In addition, in the method for manufacturing a pallet for a machine tool according to the embodiment, the polymer concrete 42 in a fluid state is poured into the molding space P of the pallet main body 43 formed in the mold 1 from the material introduction ports 10a and 11a and cured. In the method of manufacturing the pallet of the machine tool by making the plurality of female screw insert members 19 fixed to the upper surface (inner surface) 3a of the lower die 3 into the molding space P of the mold 1, the screw holes 19d thereof are provided. A plurality of cone locators (insertion members for positioning holes) 27 held to the outside of the molding space P and fixed to the upper mold 10 mold the openings of the tapered holes (positioning holes) 27b. It is configured to be held toward the outside of the space P.
Therefore, since the fluidized polymer concrete 42 is poured into the molding space P of the mold 1 and cured to produce the pallet 43, the upper surface 3a of the lower mold 3 and the front and rear side molds 4 and 5 of the mold 1 are formed. The molding surface consisting of the surfaces 4f, 4b, 5f, 5b, the surfaces 15b, 16c, 17b, 18c of the left and right side molds 8, 9 and the lower surface 10b of the upper mold 10 can be transferred to the polymer concrete with high accuracy. Thus, a pallet product with uniform accuracy can be repeatedly produced without performing machining and subsequent adjustment work unlike a conventional iron pallet.

  Further, according to the pallet manufacturing method of the machine tool according to the embodiment, the same positioning as the positioning and fixing mechanism on the table that fits into the mold 1 when the pallet main body 43 is carried into the table of the machine tool. Since a positioning and fixing mechanism including a cone (positioning member) 28c is provided and the cone locator (positioning hole insert member) 27 is fitted to the positioning cone 28c and positioned and fixed to the mold 1. Since the cone locator 27 is positioned and held in the molding space P of the mold 1 by the same positioning and fixing mechanism as the positioning and fixing mechanism on the table of the machine tool, the cone locator 27 embedded in the molded pallet 43 is The consistency with the positioning and fixing mechanism on the table is enhanced, and the pallet 43 carried on the table of the machine tool is Can be positioned and fixed with high accuracy on Buru, it is possible to enhance the machining accuracy of the workpiece.

Further, according to the pallet manufacturing method of the machine tool according to the embodiment, the female screw insert member 19 is screwed into the bolt 20 inserted through the screw hole 19d from the inner surface 3a side of the lower mold 3 of the mold 1. Therefore, the female screw insert member 19 is fixed to the mold 1 with the bolt 20 using the screw hole 10d provided in the female screw insert member 19 and is formed in the molding space P. It can be easily held without using any special means.
Furthermore, the mold 1 has material introduction holes 10a and 11a formed in the upper part, and an upper surface (inner surface) 3a that is a pallet upper surface mold surface for forming the upper surface 43a of the pallet 43 in the lower mold 3 at the bottom. After the flowing polymer concrete 42 is poured into the molding space P, the pressure piston 33 is inserted into the material introduction holes 10a and 11a to pressurize the fluid polymer concrete in the molding space P. Therefore, by pressurizing the fluidized polymer concrete in the molding space P with the pressurizing piston 33, the polymer concrete is applied to the upper surface 3a of the lower mold 3 of the mold 1 without generating a pressurization mark. By transferring with high accuracy, the upper surface 43a, which is the work mounting surface of the product pallet 43, can be formed with higher accuracy.

  The lower mold 3, the front and rear mold surface molds 4, 5, the left and right front blocks 6, 7, the left and right surface molds 8, 9 and the upper mold 10 are combined to form a pallet. Although the mold 1 for forming the space P is configured, the specific configuration of the mold 1 is not limited to the above embodiment, and various modifications may be made according to the shape, size, etc. of the pallet to be molded. it can. The position of the mold surface for the pallet upper surface that forms the upper surface 43a of the pallet 43 and the position of the pressure piston 33 that pressurizes the flowing polymer concrete in the molding space P of the mold 1 are the same as those of the above embodiment. Not only the position but also other positions can be provided.

It is a top view which shows the metal mold | die used for manufacturing the pallet of the machine tool which concerns on one embodiment of this invention. It is also a front view. Similarly, it is a right side view. Similarly, it is a left side view. FIG. 2 is a cross-sectional view taken along the line II in FIG. 1. FIG. 6 is a cross-sectional view of FIG. FIG. 6 is a cross-sectional view of FIG. It is an enlarged view of the A section of FIG. It is an enlarged view of the B section of FIG. It is an enlarged view of the C section of FIG. It is a systematic diagram which shows an example of the equipment which implements the manufacturing method of the pallet of the machine tool which concerns on one embodiment of this invention. It is a perspective view which shows the pallet of the machine tool which concerns on one embodiment of this invention.

Explanation of symbols

1 Mold 2 Base plate 3 Lower mold 3b, 3c Reference surface 4, 5 Front, rear side mold 6, 7 Left, right side block 8, 9 Left, right side mold 10 Upper mold 11 Cone locator base (positioning member mounting plate)
12, 13 Positioning plate 15, 17 Lower die member 16, 18 Upper die member 19 Female thread insert member 20 Mounting bolt 27 Cone locator (positioning hole insert member)
27b Tapered hole (positioning hole)
28 Positioning cone (positioning member)
28c Taper shaft part 33 Pressure piston 35 Mixer 38 Polymer tank 39 Hardener tank 41 Aggregate tank P Molding space

Claims (5)

  A pallet main body made of polymer concrete, a plurality of female screw insert members embedded in the upper part of the pallet main body with screw holes opened on the upper surface of the pallet main body, and the table when the pallet main body is carried into the table of the machine tool A positioning hole that fits into the upper positioning member; and a plurality of positioning hole insert members embedded in the lower portion of the pallet body, the positioning hole being opened on the lower surface of the pallet body. A pallet for machine tools. In a method of manufacturing a pallet of a machine tool by pouring polymer concrete in a fluid state from a material introduction port into a molding space of a pallet body formed inside a mold and curing it,
In the molding space of the mold, a plurality of female screw insert members are held in one of the upper and lower portions, with the openings of the screw holes facing the outside of the molding space, and on the other side, a plurality of positioning members. A method of manufacturing a pallet for a machine tool, wherein the hole insert member is held with the openings of the positioning holes facing the outside of the molding space.   The mold is provided with a positioning and fixing mechanism that is the same as the positioning and fixing mechanism on the table that is fitted when the pallet main body is carried into the table of the machine tool, and the positioning hole insert member is fitted into the positioning and fixing mechanism. The pallet manufacturing method for a machine tool according to claim 2, wherein the pallet is positioned and fixed to a mold.   The pallet for a machine tool according to claim 2 or 3, wherein the female screw insert member is fixed to the die by being screwed into a bolt inserted through the screw hole from the die side. Production method. The mold is provided with a material introduction hole at the top and a pallet top mold surface that forms the top surface of the pallet at the bottom, and after flowing polymer concrete into the molding space, the material introduction hole 5. The method for producing a pallet for a machine tool according to claim 2, wherein a pressure piston is inserted into the polymer concrete to pressurize the polymer concrete in a fluidized state in the molding space.

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