JP6183496B1 - Raw nails - Google Patents

Abstract

The present invention provides a raw nail capable of sufficiently suppressing the rotation of the raw nail and taking a sufficiently large processing area of the raw nail. A raw claw (100) is formed in a regular polygonal column and has a first through-hole penetrating to an upper surface of the regular polygonal column so as to pass through a first central axis (112a) that is a central axis of the regular polygonal column. (112), and a child claw (110) having a regular polygonal groove formed on the lower surface of the regular polygonal column so as to pass through the first through hole, and for attaching to a machine tool The first bolt hole (122) and the second bolt hole (123) into which the fixing bolt is inserted, and the regular polygonal columnar convex portion (128) which is fitted into the regular polygon groove of the child claw and fixes the child claw. And a parent nail (120). A second through hole (128b) that penetrates the convex portion is formed in the convex portion, and when the child claw is fixed to the parent claw, the first central axis and the second central axis that is the central axis of the second through hole (122a) overlaps. [Selection] Figure 4

Description

  The present invention relates to a raw nail that is attached to a machine tool and holds a workpiece.

  When processing a workpiece with a machine tool such as a lathe, the workpiece is fixed by, for example, a hard claw. However, when the work piece is fixed with a hard nail, there is a problem that a hard nail fixing scar remains on the work piece.

  On the other hand, for example, in Patent Document 1, a raw nail is attached to a machine tool via an adapter, and the workpiece is held by the raw nail processed according to the shape of the workpiece. Has been shown to make it difficult to remain. In addition, it is shown that by using the regular hexagonal columnar raw nails, each corner of the regular hexagonal column is formed in a different toe shape, so that it can be used for a large number of workpieces with high versatility. Yes.

JP 2002-137105 A

  However, in Patent Document 1, the raw nail is attached to the machine tool so that the raw nail does not rotate by sandwiching the outer wall of the raw nail with an adapter. However, since the outer wall of the raw nail is processed and used, the shape of the outer wall of the raw nail is a constant shape. In other words, there is a possibility that the fixation of the raw nail becomes insufficient. Patent Document 1 also shows that an engagement hole is provided on the lower surface of the raw nail to engage the adapter locking mechanism to prevent the rotation of the raw nail, but the shape of the engagement hole is small, When the size is large, the rotation of the raw nail may not be sufficiently prevented. Furthermore, when the number of engagement holes is increased and the size is increased, there is a problem that the area where the raw nail can be processed is greatly limited.

  Therefore, an object of the present invention is to provide a raw nail that can sufficiently suppress the rotation of the raw nail and can take a sufficiently large processing area of the raw nail.

  The raw nail according to the first aspect has a first through-hole whose outer shape is formed in a regular polygonal column shape and penetrates to the upper surface of the regular polygonal column so as to pass through the first central axis that is the central axis of the regular polygonal column. A first claw hole having a regular polygonal groove formed on the lower surface of the regular polygonal column so as to pass through, a child claw for gripping the workpiece, and a fixing bolt for attaching to the machine tool; A main nail having a second bolt hole and a regular polygonal columnar convex portion that is fitted into the regular polygon groove of the child nail and fixes the child nail. A second through hole penetrating the convex portion is formed in the convex portion, and when the child claw is fixed to the parent claw, the first central axis and the second central axis that is the central axis of the second through hole overlap. ing.

  In the raw nail of the second aspect, in the first aspect, the child nail is formed with a circular groove that passes through the first central axis and is formed on the upper surface of the regular polygonal column.

  In the first aspect and the second aspect, the raw nail of the third aspect is rounded at each corner of the regular polygon groove and each corner of the convex portion.

  In the raw nail of the fourth aspect, in the first and second aspects, a cylindrical groove having a radius shorter than half of the length of the side of the regular polygon is formed at each corner of the regular polygon groove. ing.

  In the raw nail of the fifth aspect, the central axis of the first bolt hole overlaps the second central axis in the first to fourth aspects.

  The raw nail of the sixth aspect is formed so that the convex portion does not overlap the first bolt hole and the second bolt hole in the first to fourth aspects.

  According to the raw nail of the present invention, the rotation of the raw nail can be sufficiently suppressed, and the processing area of the raw nail can be made sufficiently large.

1 is a perspective view of a raw nail 100. FIG. (A) is a perspective view of the child claws 110. FIG. (B) is BB sectional drawing of Fig.2 (a). (C) is a bottom view of the child claws 110. (A) is a perspective view of the parent nail 120. FIG. (B) is CC sectional drawing of Fig.3 (a). (C) is a top view of the parent nail 120. (A) is AA sectional drawing of FIG. (B) is sectional drawing of the raw nail | claw 100 in which the fixing bolt 150 was inserted. (A) is a perspective view of the turntable 160 and the claw cradle 161. FIG. 5B is an enlarged view of a dotted line 181 in FIG. (A) is a top view of the processed raw nail 100. FIG. FIG. 4B is a plan view of the chuck 165. FIG. (A) is a perspective view of the parent nail 220. FIG. (B) is a bottom view of the child claws 210. (A) is a perspective view of the child claws 310. FIG. (B) is DD sectional drawing of Fig.8 (a). (C) is a cross-sectional view of the washer 330. (A) is a top view of the main nail 320. FIG. (B) is a plan view of the chuck 265. (A) is a perspective view of the parent nail 420. FIG. (B) is EE sectional drawing of Fig.10 (a). (A) is sectional drawing of the child nail | claw 410. FIG. (B) is a bottom view of the child claws 410. (A) is sectional drawing of the nail | claw 510. FIG. (B) is a perspective view of the child claws 510.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the scope of the present invention is not limited to these forms unless otherwise specified in the following description.

(First embodiment)
<Configuration of raw nail 100>
FIG. 1 is a perspective view of the raw nail 100. The raw nail 100 is composed of a parent nail 120 and a child nail 110. As shown in FIG. 1, the raw claw 100 is used by attaching a child claw 110 to a parent claw 120 and attaching the parent claw 120 to a machine tool or the like. The parent claw 120 is formed in a substantially rectangular parallelepiped shape, and has an upper surface 121a on which the child claw 110 is placed and a lower surface 121b that is a surface opposite to the upper surface 121a and attached to a machine tool or the like. doing. In the following description, the direction in which the long side of the parent claw 120 extends will be described as the X-axis direction, the direction in which the short side extends will be described as the Y-axis direction, and the direction perpendicular to the X-axis direction and the Y-axis direction will be described as the Z-axis direction. In this case, the upper surface 121a is a surface on the + Z axis side, and the lower surface 121b is a surface on the −Z axis side.

  FIG. 2A is a perspective view of the child claws 110. The child claws 110 are formed in a regular hexagonal column shape, and the upper surface 111a that is the + Z-axis side surface and the lower surface 111b that is the −Z-axis side surface of the child claws 110 are each formed in a regular hexagon. Six corners 110a extending along the Z axis are formed on the side wall of the regular hexagonal column of the outer shape of the child claws 110. Moreover, the 1st through-hole 112 is formed so that the center of the upper surface 111a and the lower surface 111b may be penetrated. The first through hole 112 has a first central axis 112a extending in parallel with the Z axis as a central axis. The first central axis 112a is also an axis passing through the centers of the upper surface 111a and the lower surface 111b.

  FIG. 2B is a BB cross-sectional view of FIG. Moreover, FIG.2 (b) is BB sectional drawing of FIG.2 (c) mentioned later. The first through-hole 112 of the child claw 110 includes a circular groove 113 formed in contact with the upper surface 111a, a regular hexagonal groove 115 formed in contact with the lower surface 111b, and a circular groove 113 and a regular hexagonal groove 115. It is comprised by the through-hole 114 which connects. The circular groove 113, the regular hexagonal groove 115, and the through hole 114 have the first central axis 112a as the central axis. In addition, the size of the through hole 114 in the XY plane is smaller than the sizes of the circular groove 113 and the regular hexagonal groove 115 in the XY plane.

  FIG. 2C is a bottom view of the child claws 110. FIG. 2C shows that the through hole 114 has a circular shape and is smaller than the regular hexagonal groove 115. The regular hexagonal groove 115 has a regular hexagonal cross section, but is formed such that all corners 115a of the regular hexagonal groove 115 are rounded. Further, the corner 115 a of the regular hexagonal groove 115 is formed on a straight line connecting the first central axis 112 a and the corner 110 a of the child claw 110.

  The circular groove 113 and the through hole 114 are formed by, for example, a lathe or a milling machine. The regular hexagonal groove 115 is formed, for example, by forming a circular groove on the first central axis 112a with a lathe or a milling machine, inserting an end mill into the circular groove, and moving the end mill in the XY plane. A regular hexagonal groove 115 can be formed by spreading. Since the regular hexagonal groove 115 is formed by the end mill in this way, the corner 115a of the regular hexagonal groove 115 is formed so as to have a round chamfer which is the radius of the end mill.

  FIG. 3A is a perspective view of the parent nail 120. The master claw 120 has a body portion 121 and a convex portion 128 that are substantially rectangular parallelepiped. In the body 121, a convex portion 128 having an outer shape of a substantially regular hexagonal column is formed on an upper surface 121a that is a surface on the + Z-axis side. In the regular hexagonal column of the outer shape of the convex portion 128, six corner portions 128a extending along the Z axis are formed. Further, the first nail 120 is formed with a first bolt hole 122 that penetrates the convex portion 128 and the body portion 121 in the Z-axis direction, and a second bolt hole 123 that penetrates the body portion 121 in the Z-axis direction. . On the lower surface 121b that is the surface on the −Z-axis side of the body portion 121, a groove 124 that extends from the −X-axis side end to the + X-axis side end at the center of the lower surface 121b is formed. In addition, a protrusion 125 extending from the −Y axis side to the + Y axis side is formed in a portion excluding the groove 124 substantially at the center of the lower surface 121b.

  FIG.3 (b) is CC sectional drawing of Fig.3 (a). Moreover, FIG.3 (b) is CC sectional drawing of FIG.3 (c) mentioned later. The first bolt hole 122 has a second central axis 122a parallel to the Z axis, and the second bolt hole 123 has a central axis 123a parallel to the Z axis. The first bolt hole 122 includes a second through hole 128b that penetrates the convex portion 128, and the second through hole 128b has the second central axis 122a as a central axis. The second bolt hole 123 includes a circular groove 126 connected to the upper surface 121 a and a circular groove 127 connected to the lower surface 121 b and the circular groove 126. The diameter of the circular groove 126 is larger than that of the circular groove 127.

  FIG. 3C is a top view of the parent nail 120. In the master claw 120, the second central axis 122a and the central axis 123a are formed side by side in the X-axis direction. Further, the corner portion 128a of the convex portion 128 is formed so as to have a round chamfer having substantially the same radius as the corner portion 115a of the regular hexagonal groove 115 of the child claw 110, and at least one corner portion 128a is the first corner portion 128a. 2 formed on a straight line connecting the central axis 122a and the central axis 123a.

  FIG. 4A is a cross-sectional view taken along the line AA in FIG. 4A includes the BB cross section of the child claw 110 of FIG. 2A, and includes the CC cross section of the parent claw 120 of FIG. 3A. The child claws 110 are combined with the parent claws 120 by fitting the regular hexagonal grooves 115 of the child claws 110 into the convex portions 128 of the parent claws 120. The diameter of the outer circumferential circle of the regular hexagonal groove 115 and the diameter of the outer circumferential circle of the convex portion 128 are formed to be substantially equal. When the child claw 110 is connected to the parent claw 120, the regular hexagon of the child claw 110 is formed. When the side surface of the groove 115 and the side surface of the convex portion 128 of the parent claw 120 contact each other, the child claw 110 is fixed so as not to rotate in the XY plane.

  In the raw nail 100, as shown in FIG. 4A, the child nail 110 and the parent nail 120 are combined so that the first center axis 112a of the child nail 110 and the second center axis 122a of the parent nail 120 overlap. . Moreover, the through-hole 114 and the 1st bolt hole 122 of the child nail | claw 110 are formed in the substantially same diameter.

  FIG. 4B is a cross-sectional view of the raw claw 100 in which the fixing bolt 150 is inserted. The cross-sectional view of the raw nail 100 shown in FIG. 4 (b) is the same as FIG. 4 (a). In the raw claw 100 shown in FIG. 4B, the fixing bolt 150 is inserted into the first bolt hole 112 and the second bolt hole 123, and is fixed to the machine tool or the like by the fixing bolt 150. The fixing bolt 150 includes, for example, a head portion 151 and a shaft portion 152, and the head portion 151 is fixed to the circular groove 113 of the child claw 110 and the circular groove 126 of the second bolt hole 123, whereby the raw claw 100 is attached to a machine tool or the like. Fixed. The shaft portion 152 is threaded as a male screw, and the raw claw 100 is screwed to a machine tool or the like.

  FIG. 5A is a perspective view of the turntable 160 and the claw base 161. In FIG. 5A, a lathe 160 of a lathe and three claw bases 161 attached to the turntable 160 are shown. The raw nail 100 is used by being attached to each nail cradle 161. Each claw cradle 161 moves back and forth with respect to the center of the turntable 160.

  FIG. 5B is an enlarged view of a dotted line 181 in FIG. In FIG. 5 (b), one claw base 161 attached to the turntable 160 is shown. The claw receiving table 161 is formed with a protrusion 162 protruding from the surface of the claw receiving table 161 so that the center of the claw receiving table 161 extends from the outer peripheral side of the rotating disk 160 toward the center side. Further, a groove 163 is formed near the center of the claw receiving base 161 so as to block the protrusion 162. When the raw nail 100 is fixed to the nail cradle 161, the groove 124 of the lower surface 121b of the body part 121 of the parent nail 120 of the raw nail 100 is fitted into the protrusion 162, and the protrusion 125 of the lower surface 121b of the body part 121 is inserted into the nail cradle. 161 is inserted into the groove 163. In addition, two screw holes 164 are formed in the claw base 161, and the raw claw 100 is fixed to the claw base 161 by fixing the fixing bolt 150 to the screw hole 164.

  FIG. 6A is a top view of the processed raw nail 100. In the raw nail 100, each corner 110a of the child nail 110 serves as a toe for fixing the workpiece, but each corner 110a is used by being processed according to the shape of the workpiece. In FIG. 6A, the corner 110a on the + X-axis side of the child claws 110 is cut according to the shape of the workpiece. Although the child claws 110 have six corner portions 110a, since each corner portion 110a can be processed differently, one child nail 110 can be used to hold a plurality of workpieces having different shapes.

  FIG. 6B is a plan view of the chuck 165. FIG. 6B shows a state where the chuck 165 holds the workpiece 170. A chuck 165 for holding the workpiece 170 includes a rotating disk 160, a claw base 161, and a raw claw 100. FIG. 6B shows a state where the raw nail 100 is fixed to the nail cradle 161 by the fixing bolt 150 and holds the workpiece 170. In each raw nail 100 shown in FIG. 6B, the corner 110a of the child nail 100 is cut as shown in FIG. 6A, thereby holding the workpiece 170 in a wide area. In addition, since it is difficult for the force to concentrate on a specific portion of the workpiece 170, scars due to the holding are hardly left on the workpiece 170, and deformation can be suppressed. In addition, the child claws 110 of the raw claws 100 are preferably formed of the same material as the workpiece 170. The processing of the raw nail 100 is appropriately performed according to the shape of the workpiece 170. However, when the material of the child nail 110 and the workpiece 170 is the same, it is preferable because the chip processing becomes easy.

  In the raw nail 100, when the child nail 110 is fixed so as not to rotate with respect to the parent nail 120, the outer nail 110 is fixed not by suppressing the outer wall of the child nail 110 but by suppressing the inner wall of the regular hexagonal groove 115 of the child nail 110. doing. Therefore, even if the outer wall of the child claws 110 is shaved as shown in FIG. 6A and the shape of the outer wall is changed, the force for fixing the child claws 110 does not drop. Further, since the child claws 110 and the parent claws 120 are combined so that the side surfaces of the regular hexagonal grooves 115 of the child claws 110 and the side surfaces of the convex portions 128 of the parent claws 120 are in contact with each other, It is preferable because the contact area on the side surface becomes large and the child claws 110 can be firmly fixed so as not to rotate in the XY plane.

  Furthermore, since the side surface of the regular hexagonal groove 115 of the child nail 110 is separated from the outer wall of the child nail 110, the cutting area of the child nail 110 can be secured widely, and the child nail 110 can be secured as shown in FIG. It is preferable because the outer wall of the nail 110 can be greatly sharpened and it is easy to deal with workpieces of various shapes and sizes.

(Second Embodiment)
The child claws and the parent claws constituting the raw claws can be formed in various shapes. Hereinafter, modifications of the child claws and the parent claws will be described.

<Configuration of parent nail 220>
FIG. 7A is a perspective view of the parent nail 220. The parent nail 220 has a body part 121 and a convex part 228. The convex portion 228 has an outer shape formed in a hexagonal column shape, and a first bolt hole 122 is formed in the center. Unlike the corner portion 128a of the convex portion 128 shown in FIG. 3A, the corner portion 228a of the convex portion 228 is not rounded and formed as an obtuse angle. Other portions of the parent nail 220 are the same as those of the parent nail 120.

<Configuration of child claws 210>
FIG. 7B is a bottom view of the child claws 210. The child claws 210 are formed with regular hexagonal grooves 215 instead of the regular hexagonal grooves 115 of the child claws 110 (see FIGS. 2A to 2C), and other components are the child claws 110. Is the same. In the regular hexagonal groove 215, circular grooves 215 a are formed at each corner of the regular hexagonal groove 215. The radius R1 of the circular groove 215a is shorter than half the length S1 of each side of the regular hexagonal groove 215. As a result, the regular hexagonal groove 215 always has a side wall that contacts the side surface of the convex portion 228.

  When fitting the child claw 110 into the convex part 228 of the parent claw 220 shown in FIG. 7A, the corner 115a of the regular hexagonal groove 115 of the child claw 110 (FIG. 2C). And the corners 228a of the projections 228 of the parent claw 220 are in contact with each other, and the side surfaces of the projections 228 and the side walls of the regular hexagonal grooves 115 are not in contact with each other. There are cases where it cannot be suppressed. In addition, since the regular hexagonal groove 115 is formed by an end mill, it is difficult to form the corner 115a in an obtuse shape in accordance with the shape of the convex portion 228.

  On the other hand, the child claws 210 can be used as the parent claws 220. When the child claws 210 are combined with the parent claws 220, the corners 228 a of the convex portions 228 are inserted into the circular grooves 215 a at the corners of the regular hexagonal grooves 215, and the side walls of the regular hexagonal grooves 215 and the side surfaces of the convex portions 228. Therefore, the child claws 210 can be firmly fixed to the parent claws 220.

<Configuration of child claws 310>
FIG. 8A is a perspective view of the child claws 310. The child claws 310 are formed in a regular hexagonal column shape. The upper surface 311a that is the surface on the + Z-axis side and the lower surface 311b that is the surface on the −Z-axis side of the child claws 310 are formed in a regular hexagon. A first through hole 312 that penetrates the child claws 310 in the Z-axis direction is formed at the center of the child claws 310. The first through hole 312 is formed by a circular groove 313 formed at the center of the upper surface 311a and a regular hexagonal columnar through hole 314 formed at the center of the lower surface 311b and connected to the circular groove 313. Unlike the corner portion 115a of the regular hexagonal groove 115 of the child claw 110 in FIG. 2C, the corner portion 314a of the regular hexagonal columnar through-hole 314 is formed at an obtuse angle.

  FIG.8 (b) is DD sectional drawing of Fig.8 (a). The child claws 310, the regular hexagonal columnar through-holes 314 of the child claws 310, and the circular groove 313 all have a first central axis 312 a extending in the Z-axis direction as a central axis. The circular groove 313 of the child claws 310 has a diameter D1 and the regular hexagonal columnar through hole 314 has a diameter of a circumscribed circle of the regular hexagonal column D2. In the child claw 310, the diameter D1 is formed larger than the diameter D2, and when the child claw 310 is fixed with a fixing bolt, the head of the fixing bolt is suppressed by the circular groove 313.

  The regular hexagonal columnar through-hole 314 is formed by, for example, wire discharge cutting. Therefore, the corner | angular part 314a of the regular hexagonal columnar through-hole 314 can be formed in an obtuse angle like Fig.8 (a). Moreover, since the corner | angular part 314a of the regular hexagonal columnar through-hole 314 is formed in an obtuse angle, the child claw 310 forms the corner | angular part 228a of the convex part 228 like the main nail | claw 220 (refer Fig.7 (a)) in an obtuse angle. Can be used in combination with the parent nails.

  FIG. 8C is a cross-sectional view of the washer 330. The washer 330 is used by being attached to the child claw 310 when the raw claw having the child claw 310 is attached to the machine tool or the like by the fixing bolt 150. The washer 330 is formed by a disc-shaped base portion 335 and a convex portion 336 formed on the surface of the base portion 335 on the −Z-axis side. The base 335 is fitted into the circular groove 313 of the child claw 310 when the washer 330 is attached to the child claw 310. Further, the convex portion 336 is fitted into the regular hexagonal columnar through-hole 314 of the child claw 310 when the washer 330 is attached to the child claw 310. The convex portion 336 is formed in a regular hexagonal column shape, for example, in accordance with the shape of the columnar or regular hexagonal columnar through hole 314, and is the sum of the convex portion of the parent nail (for example, the convex portion 128) and the convex portion 336 of the washer 330. It is formed so that the height is the same as or smaller than the length in the Z-axis direction of the regular hexagonal columnar through hole 314 of the child claw 310. The base portion 335 and the convex portion 336 are formed so that the first central axis 312a becomes the central axis when the washer 330 is attached to the child claw 310.

  A through-hole 332 that penetrates in the Z-axis direction is formed at the center of the washer 330. The through-hole 332 is formed on the surface on the + Z-axis side of the washer 330 and on the surface on the −Z-axis side of the washer 330 and is connected to the upper circular groove 333 and more than the upper circular groove 333. The lower circular groove 334 having a small radius is formed with the first central axis 312a as the central axis. When fixing the raw claw having the claw 310 to the machine tool, the washer 330 is fitted into the claw 310 and the fixing bolt 150 is inserted into the through hole 332 so that the head 151 is fixed to the upper through hole 333. It can be screwed to machine tools and the like.

<Configuration of parent nail 320>
FIG. 9A is a plan view of the parent nail 320. The master claw 320 includes a body portion 121 and a convex portion 128, like the parent claw 120, but unlike the parent claw 120, the convex portion 128 is formed so that the side faces not the corner portion 128 a in the + X-axis direction. Has been.

  FIG. 9B is a plan view of the chuck 265. FIG. 9B shows a state where the raw claw 300 is fixed to the claw receiving base 161 by the fixing bolt 150 and the chuck 265 holds the workpiece 171. The chuck 265 includes a rotating plate 160, a claw base 161, and a raw claw 300. The raw nail 300 is formed by combining the child nail 110 and the parent nail 320. In the raw nail 300, since the convex portion 128 of the parent claw 320 is fitted and combined with the regular hexagonal groove 115 of the child nail 110, the side surface of the child nail 110 faces in the X-axis direction. In the raw nail 300 shown in FIG. 9B, the side surface of the child nail 110 that contacts the workpiece 171 is cut according to the shape of the workpiece 171.

  When a relatively large workpiece 171 is to be held by the corner 110a of the child claw 110, the corner 110a of the child claw 110 is deepened to secure a contact area between the workpiece 171 and the child claw 110. I have to sharpen it. Therefore, it may be difficult to process the child claws 110. In the raw nail 300, the side surface of the child nail 110 is processed to hold the workpiece 171, thereby reducing the processing amount of the child nail 110 and increasing the contact area between the workpiece 171 and the child nail 110. be able to.

<Configuration of parent nail 420>
FIG. 10A is a perspective view of the parent nail 420. The parent nail 420 is used for, for example, a hydraulic power chuck. The parent nail 420 has a body part 421 and a convex part 428. The body portion 421 is formed in a substantially rectangular parallelepiped shape having a long side extending in the X-axis direction and a short side extending in the Y-axis direction, and a convex portion 428 is formed on the upper surface 421a which is a surface on the + Z-axis side. A groove 424 extending from the −X axis side to the + X axis side at the center of the lower surface 421b is formed in the lower surface 421b that is the surface on the shaft side. A second through hole 428b that is internally threaded is formed in the center of the convex portion 428, and a rounded chamfered corner portion 428a is formed on the outer wall of the convex portion 428. The convex portion 428 has a corner portion 428a at the end on the + X-axis side. In the body portion 421, a first bolt hole 422 and a second bolt hole 423 are formed at a location different from the convex portion 428.

  FIG.10 (b) is EE sectional drawing of Fig.10 (a). The first bolt hole 422 has a second central axis 422a parallel to the Z axis, and the second bolt hole 423 has a central axis 423a parallel to the Z axis. The first bolt hole 422 and the second bolt hole 423 are configured by a circular groove 426 connected to the upper surface 421a and a circular groove 427 connected to the lower surface 421b and the circular groove 426. The diameter of the circular groove 426 is larger than that of the circular groove 427. The convex portion 428 is formed so as not to overlap the first bolt hole 422 and the second bolt hole 423 in the Z-axis direction. The second through hole 428b formed in the convex portion 428 is formed so as to penetrate the convex portion 428 but not the body portion 421. The convex portion 428 and the second through hole 428b have a second central axis 422a that is a common central axis.

<Configuration of child claws 410>
FIG. 11A is a cross-sectional view of the child claws 410. Moreover, Fig.11 (a) is GG sectional drawing of FIG.11 (b) mentioned later. The child claws 410 are formed in a regular hexagonal column shape like the child claws 110, and regular hexagonal grooves 115 are formed on the lower surface 411b. A through hole 114 is formed so as to connect the regular hexagonal groove 115 and the upper surface 411a. The regular hexagonal groove 115 and the through hole 114 form a first through hole 412 that penetrates the child claws 410 in the Z-axis direction. The regular hexagonal groove 115 and the through hole 114 have the same first central axis 112a.

  FIG. 11B is a bottom view of the child claws 410. As shown in FIG. 11B, the regular hexagonal groove 115 is formed larger than the through hole 114. Therefore, when fixing the child claws 410, the fixing bolts having a head portion larger than the size of the through-hole 114 are used, and the head portions of the fixing bolts are suppressed by the upper surface 411a to fix the child claws 410. can do.

<Structure of child claws 510>
FIG. 12A is a cross-sectional view of the child claws 510. Moreover, Fig.12 (a) is HH sectional drawing of FIG.12 (b) mentioned later. The child claws 510 are formed in the shape of a regular hexagonal column like the child claws 110, and regular hexagonal grooves 115 are formed on the upper surface 111a and the lower surface 111b. A through hole 514 is formed so as to connect the regular hexagonal grooves 115 on the upper surface 111a and the lower surface 111b. The regular hexagonal groove 115 and the through-hole 514 form a first through-hole 512 that penetrates the child claw 510 in the Z-axis direction. The regular hexagonal groove 115 and the through hole 514 have the same first central axis 112a. The child claws 510 have the same configuration as the child claws 110 (see FIG. 2) except for the regular hexagonal grooves 115 and the through holes 514 on the upper surface 111a. Since the child claws 510 are formed so as to be symmetrical in the vertical direction, the upper surface 111a can be used as a surface on the −Z axis side and the lower surface 111b can be used as a surface on the + Z axis side so as to be turned upside down.

  FIG. 12B is a perspective view of the child claws 510. As for the child nail 510, the corner | angular part 110a is processed and the holding part for hold | maintaining a to-be-processed object is formed. 12 (b), a fan-shaped holding portion 511a is formed on the upper surface 111a side of one corner portion 110a, and a fan shape having a smaller radius than the holding portion 511a is formed on the lower surface 111b side of the holding portion 511a. The holding portion 511b is formed. A fan-shaped holding portion 511c is formed on the lower surface side 111b of the corner portion 110a. Since the child claws 110 are formed in a hexagonal column shape, different holding portions can be formed on the six corner portions 110a. However, since the child claws 510 can be used upside down, the upper surface of one corner portion 110a can be used. Holding portions can be formed on the 111a side and the lower surface 111b side, respectively, and different holding portions can be formed at a total of 12 locations.

  As described above, the optimal embodiment of the present invention has been described in detail. However, as will be apparent to those skilled in the art, the present invention can be implemented with various modifications and variations within the technical scope thereof.

  For example, in the above embodiment, the outer shape of the child claw, the groove on the lower surface of the child claw, and the convex portion of the parent claw are formed in a regular hexagonal column shape. It may be formed in a column shape. If the outer shape of the child claw, the planar shape of the groove on the lower surface of the child claw and the convex part of the parent claw are formed by the same regular polygon, do not move easily with the child claw attached to the parent nail The corners of the child claws can be used for different workpieces by rotating the child claws and attaching them to the parent claws.

  In the above-described embodiment, the description has been made assuming that the raw claws are attached to the turntable 160 so that the child claws are arranged on the center side of the turntable 160 as shown in FIG. The raw claws may be inverted and attached to the turntable 160 so that the child claws are arranged outside the turntable 160, and used as reverse claws.

  Further, in the above-described embodiment, the explanation has been made on the assumption that the raw claw is attached to the lathe of the lathe, but the raw claw may be used for fixing the workpiece on the NC lathe and the milling machine. Furthermore, the above embodiments may be implemented in various combinations.

100, 300 ... Raw claws 110, 210, 310, 410, 510 ... Child claws 110a ... Corners of child claws 111a, 311a, 411a ... Upper surface 111b, 311b, 411b ... Lower surface 112, 312, 412, 512 ... First through hole 112a, 312a ... 1st central axis 113 ... Circular groove 114, 514 ... Through-hole 115, 215 ... Regular hexagonal groove 115a ... Corner part 120 of regular hexagonal groove 115 120, 220, 320, 420 ... Parent claw 121, 421 ... Body part 121a, 421a ... Upper surface 121b, 421b of body part Lower surface of body part 122, 422 ... First bolt hole 122a, 422a ... Second central axis 123, 423 ... Second bolt hole 123a ... Center of second bolt hole Shafts 124, 424... Groove on the lower surface of the body portion 125... Projection 126 on the lower surface of the body portion 126 127, 426, 427 ... Circular groove 128, 228, 428 ... Convex part 128a, 228a, 428a ... Convex part corner 128b, 428b ... Second through hole 150 ... Fixing bolt 151 ... Head 152 ... Shaft part 160 ... Rotation Panel 161 ... Claw holder 162 ... Protrusion 163 ... Groove 164 ... Screw hole 165, 265 ... Chuck 170 ... Workpiece 215a ... Circular groove 313 ... Circular groove 314 ... Regular hexagonal columnar through hole 330 ... Washer 332 ... Through hole 333 ... Upper circular groove 334 ... Lower circular groove 335 ... Base 336 ... Convex part 511a, 511b, 511c ... Holding part

Claims (5)

The outer shape is formed in a regular polygonal column shape, and passes through the first through hole penetrating to the upper surface of the regular polygonal column so as to pass through the first central axis that is the central axis of the regular polygonal column, and the first through hole. A claw having a regular polygonal groove formed on the upper and lower surfaces of the regular polygonal column in a vertically symmetrical manner and gripping the workpiece;
A first polygon hole and a second bolt hole into which fixing bolts for attachment to a machine tool are inserted, and a regular polygon that is fitted into the regular polygon groove on the upper surface or the lower surface of the child claws to fix the child claws. A columnar convex part, and a parent claw comprising:
The convex portion is formed with a second through-hole penetrating the convex portion, and when the child claw is fixed to the parent claw, the first central axis and the central axis of the second through-hole are 2 Raw nails that overlap with the central axis. Wherein each corner of each corner and the convex portion of the grooves of the regular polygon are round chamfered, soft jaws according to claim 1, wherein the Ru protrusion is fitted into the groove of the regular polygon. The raw nail according to claim 1 , wherein a cylindrical groove having a radius shorter than half of the length of the side of the regular polygon is formed at each corner of the regular polygon groove. The raw nail according to any one of claims 1 to 3 , wherein a central axis of the first bolt hole overlaps the second central axis. The raw nail according to any one of claims 1 to 3 , wherein the convex portion is formed so as not to overlap the first bolt hole and the second bolt hole.