JP5566980B2 - Work cutting tool - Google Patents

Description

  The present invention relates to a workpiece cutting tool that can cut or chamfer workpieces of various shapes such as rods, pipes, blocks, and the like made of a hard material such as metal, non-ferrous metal, hard resin, and stone.

  Conventionally, there have been tools for polishing a workpiece into a spherical surface and an arc surface (Patent Documents 1 and 2), but the tip of the workpiece such as a non-ferrous metal, a hard resin, a hard material such as stone, or a pipe is spherical, conical, There was no cutting tool that could cut into a convex arc. Therefore, conventionally, in order to cut a workpiece made of hard material, a disk-shaped cutting tool (cutting blade, cutting abrasive grain, etc.) is rotated, and the workpiece is pressed against the cutting tool to cut the workpiece. Cutting while changing the position where the cutting tool was pressed against the workpiece while checking. Therefore, it takes time to cut, and skill is required to be able to cut into a fixed shape.

  There are two types of polishing tools in the above-mentioned Patent Document 1, and one of them polishes the convex spherical part of a workpiece that has been processed into a convex spherical shape in advance by bringing it into contact with the curved curved polishing surface of the polishing tool. The other is to polish the concave spherical surface of the workpiece that has been processed into a concave spherical shape in advance by bringing it into contact with the spherical polishing surface protruding from the processing tool. However, since the former has a larger curved diameter than the convex spherical surface of the workpiece, and the latter has a larger protruding diameter than the concave spherical surface of the workpiece, the latter has both a convex spherical surface and a concave spherical surface. In order to polish the whole, it was necessary to move the workpiece while observing the cutting state of the workpiece to bring it into contact with the curved polishing surface or the spherical polishing surface.

  The polishing tool disclosed in Patent Document 2 polishes a curved polishing surface (surface member) in which a polishing tool is recessed by contacting the convex spherical surface of a workpiece that has been processed into a convex spherical surface in advance. However, since the curved polishing surface of the polishing tool is smaller than the convex spherical surface of the workpiece, the polishing tool must be moved along the convex spherical surface of the workpiece. Moreover, since the surface member of the tool is made of resin in order to finish the surface of the workpiece smoothly, it cannot be used for cutting.

  In either case of Patent Documents 1 and 2, the polished surface of the work must be processed into a spherical shape or a curved concave shape in advance. Moreover, although it could grind | polish, it was not able to cut.

JP-A-8-206953 JP-A-9-239666

  The problem to be solved by the present invention is that if the workpiece is inserted into the cutting tool and the work surface of the workpiece is pressed against the cutting portion of the cutting tool, the workpiece can be cut into a predetermined shape without moving the workpiece while observing the cutting state. It is to provide a work cutting tool with good cutting efficiency.

  The workpiece cutting tool of the present invention is a workpiece cutting tool capable of cutting by inserting workpieces of various shapes such as a rod shape, a column shape, a cylindrical shape, and a block shape, and cutting capable of inserting the workpiece into a base body that can be mounted on a rotating device. When a recess is formed, a cutting portion is provided on the inner peripheral surface of the cutting recess, and the work piece inserted into the cutting recess is pressed against the cutting portion, the workpiece insertion portion ( The workpiece) can be cut along the shape of the inner peripheral surface of the cutting recess.

The inner peripheral surface of the cutting recess can be formed into an arc shape, a conical shape or a truncated cone shape. The inner peripheral surface of the cutting recesses, consecutively provided over two stages smaller back side cutting recess inner diameter than the cuttable inlet side cutting recess of the workpiece and the inlet-side cutting recess, the cutting recess of each stage A cutting part such as a cutting blade or a cutting grindstone can be provided on the surface. The inlet-side cutting recess and the back-side cutting recess, also be continuously provided to allow pushing the workpiece on the far side cutting recess from the inlet side cutting recess, it may be provided in stairs shape. The inlet-side cutting recess and the back-side cutting recess provided in two or more stages of stairs-like, can also be provided chamfer cutting portion of the tapered boundary of the two cutting portions. Two or more of the cutting blades can be provided on the inner peripheral surface of the cutting recess, and the cutting abrasive grains can be diamond particles or superhard metal particles, which are fixed to the inner peripheral surface of the cutting recess. In any of the above cases, a discharge space capable of discharging chips generated by cutting in the cutting recesses or a storage space for storing the chips can be provided in the cutting recesses.

The workpiece cutting tool of the present invention has the following effects.
(1) Insert the workpiece into the cutting recess of the workpiece cutting tool, and rotate the workpiece cutting tool while pressing the tip of the workpiece in the insertion direction against the cutting blade or cutting abrasive in the cutting recess, thereby inserting the workpiece. Ru can be cut along the inner surface shape of the cutting recesses of the distal end side by the cutting blade and cutting abrasive. For this reason, it is not necessary to rotate the workpiece while confirming the cutting state of the workpiece as in the prior art, and even an unskilled person can easily and quickly cut the workpiece according to the shape of the cutting recess.
(2) continuously in the inner circumferential surface of the cutting recesses, the inlet-side cutting recess and than consecutively provided two or more stages the far side cutting recess of smaller diameter from the inlet side cutting recess side to the rear side cutting recess side and if you continuously provided so as to be indentation, if successively pushed the workpiece from the inlet side cutting recess side to the rear side cutting concave portion, the inner peripheral surface of the insertion portion automatically inlet side cutting recess of the workpiece It is cut to a similar multi-stage convex and the inner surface shape between the back-side cutting recess.
(3) the case of providing the inlet side cutting recess and the back-side cutting recess in stairs shape, leave shape cutting part of each work in advance pluggable stepped cutting portions thereof shaped if put difference in the recess, it can be cut to the same multi-stage convex and inner shape of the inlet-side cutting recess and the back-side cutting recess. Moreover, even without first processed into cutting part of each work in advance pluggable shape, it is cut in the same convex shape and inner shape of the cutting recess crowded difference the workpiece inlet side cutting recess is can be, because the workpiece can be cut to the same convex shape and inner shape of the cutting recess crowded difference to the back side cutting recess the cutting of one of the outer diameter of the two or more in the work cutting tools work it can.
(4) an inlet-side cutting recess and the back-side cutting recess provided in two or more stages of stairs-like, the case of providing the chamfer cutting portion of the tapered boundary of the two cutting recess, the inlet-side cutting recess By pressing the peripheral edge part of the inserted workpiece against the chamfered cutting part, the peripheral edge part can be chamfered and cut into a tapered surface.
(5) Since a discharge port capable of discharging chips generated by cutting or a storage space in which chips can be stored is provided in the cutting recess, cutting is suspended in the middle of cutting and the workpiece is removed from the cutting recess. Even if it is not extracted and the chips in the cutting recesses are not discharged, the chips do not interfere with the cutting, continuous cutting is possible, and workability is improved.
(6) Since the cutting blade and cutting abrasive grains are provided in the cutting recess, the operator's hand and fingers do not hit the cutting blade or cutting abrasive grains to be injured.

(A) is a longitudinal sectional view showing an example of the workpiece cutting tool of the present invention, (b) is a cutting blade is attached to the cutting recess with a gap, and the gap can be stored in the gap. Explanatory drawing at the time of setting it as a storage space. (A)-(c) is sectional drawing which shows the example of a different shape at the time of making the entrance side cutting part and back | inner side cutting part of the cutting recessed part in the workpiece cutting tool of this invention continue in an arc shape, (d)-(f). (A)-(c) is sectional drawing which shows an example of the workpiece | work inserted in the cutting recessed part of (c), (g) is a perspective view of the workpiece | work which cut the work of (d) by the cutting recessed part of (a), (h) FIG. 3 is a perspective view of a workpiece obtained by cutting the workpiece (e) at the cutting recess portion (b). (A)-(c) is sectional drawing which shows the example of a different shape at the time of making the entrance side cutting part and back | inner side cutting part of a cutting recessed part in the workpiece cutting tool of this invention into a slope, (d)-(f (A) is sectional drawing which shows an example of the workpiece | work inserted in the cutting recessed part of (a)-(c), (g) is a perspective view of the workpiece | work which cut the work of (e) in the cutting recessed part of (b). (A) is sectional drawing which shows the example of a different shape at the time of making the entrance side cutting part and back | inner side cutting part of the cutting recessed part in the workpiece cutting tool of this invention into the slope, and (b) is the workpiece cutting of (a). Sectional drawing which shows an example of the workpiece | work cut with a tool, (c) is sectional drawing of the workpiece | work after cutting the workpiece | work of (b) with the workpiece cutting tool of (a). (A) is sectional drawing which shows the example which provided the chamfering cutting part in the boundary part of the entrance side cutting part and back | inner side cutting part of the cutting recessed part in the workpiece cutting tool of this invention, (b) is the workpiece cutting tool of (a). Sectional drawing which shows an example of the workpiece | work cut | disconnected by (c), (c) is sectional drawing of the workpiece | work after carrying out chamfering cutting of the workpiece | work of (b) with the workpiece cutting tool of (a). (A) is a plan view when cutting abrasive grains are attached to the inner peripheral surface of the cutting recess, (b) is a plan view when a cutting blade is attached to the inner peripheral surface of the cutting recess for clockwise rotation, and (c). (B) is a cross-sectional view when the AA cross section of the cutting blade is rectangular, (d) is a cross-sectional view when the AA cross section of the cutting blade (b) is chevron, (e) is a cutting recess. The top view at the time of attaching a cutting blade for left rotation to an internal peripheral surface.

(Embodiment with one cut recess)
An example of an embodiment of a workpiece cutting tool of the present invention will be described with reference to the drawings. The workpiece cutting tool 1 in FIG. 1A is provided with a mounting shaft 3 at one end in the axial direction of a cylindrical base material 2 and a cutting recess 4 into which a workpiece W can be inserted at the other end in the axial direction of the base material 2. A cutting portion 6 capable of cutting the workpiece W is provided on the inner peripheral surface 5 of the cutting recess 4. Several cutting blades 7 are attached to the cutting part 6 at intervals. A recess (groove, recess, etc.) is formed in the back between the adjacent cutting blades 7, and the recess is opened to the inner peripheral surface 5 of the cutting recess 4 to form a storage space 8. The reservoir space 8 has a size that allows the chips of the workpiece cut in the cutting recess 4 to be collected.

  The shape of the cutting recess 4 in FIGS. 1A and 1B is substantially semicircular, but the shape and size of the cutting recess 4 are various shapes and sizes according to the shape and size of the workpiece W to be cut. be able to. The number, formation location, area, and the like of the storage space 8 can be designed so as to easily collect chips.

  The cutting blade 7 can be formed directly on the inner peripheral surface 5 of the cutting recess 4, but a blade manufactured separately from the inner peripheral surface 5 can also be attached to the inner peripheral surface 5 by welding or other attachment means. The cutting blade 7 may be linear, arcuately curved, or other shapes, but in any case, when several pieces are attached to the inner peripheral surface 5, the workpiece cutting tool 1 is rotated in the clockwise direction. If it is rotated (right-turned) and cut to make it easier to cut, it is attached to the lower right slope (Fig. 6 (b)), or conversely, the workpiece cutting tool 1 is rotated counterclockwise (left-turned). If it cuts, it can be attached to the downward sloping slope (FIG. 6E) so that it can be easily cut.

  The shape of the cutting blade 7 can be designed according to the material, hardness, cutting shape, etc. of the workpiece. As an example, the one shown in FIG. 6C is a rectangular cross-sectional shape, and the one shown in FIG. The shape is V-shaped (mountain shape). The cutting blade 7 in FIG. 6B has a cutting blade 7a formed at the tip in the right rotation direction, and the cutting blade 7 in FIG. 6C has a cutting blade 7a formed in the tip in the left rotation direction.

  In the present invention, not the cutting blade 7 but the cutting abrasive grains 9 are attached to the inner peripheral surface 5 of the cutting recess 4 as shown in FIGS. 2 (a) to 2 (c) and FIGS. 3 (a) to 3 (c). You can also. The cutting abrasive grains 9 are made of a material that can easily cut the workpiece W. For example, diamond particles, cemented carbide particles, and the like are suitable. The particle size (size) of the cutting abrasive grains 9 is preferably selected so that the cutting efficiency is good and the finished surface of the workpiece W is smooth. The cutting particles 9 are preferably attached uniformly and densely on the entire inner peripheral surface 5 of the cutting recess 4 by vapor deposition, adhesive, or other fixing means as shown in FIG.

  At the back of the cutting recess 4 is a discharge port 10 (FIGS. 2 (a) to (c), FIGS. 3 (a) to (c)) for discharging the chips of the workpiece W to be cut inside. Can be provided. As an example, the discharge port 10 shown in FIGS. 2A to 2C is opened through the depth of the cutting recess 4. The number of the discharge ports 10 can be two or more, and the opening location and size can be designed so that the chips are easily discharged.

(Usage example of workpiece cutting tool in FIG. 1 (a))
In order to cut the workpiece W using the workpiece cutting tool 1 shown in FIG. 1A, the mounting shaft 3 of the workpiece cutting tool 1 is attached to a rotating device. If the tip side of the round bar-shaped workpiece W is inserted into the cutting recess 4 of the workpiece cutting tool 1, the tip is pressed against the cutting portion 6, the mounting shaft 3 is rotated by a rotating device, and the base body 2 is rotated. The tip side of the workpiece W is cut into a convex hemisphere along the inner surface of the cutting recess 4. In this case, if the rotating device can be swung in any direction of 360 degrees with the axis of the mounting shaft 3 as the central axis, cutting becomes easier.

(Work cutting tool in FIG. 2A and its use example)
As shown in FIGS. 2A to 2C, the inner circumferential surface 5 of the cutting recess 4 can be formed in two or more stages, and the cutting blade 7 and the cutting abrasive grains 9 can be provided on the inner circumferential surface 5 of each stage. . The number of steps and the shape of each step can be designed according to the cutting shape of the workpiece. Even in the case of multiple stages, the same points as in the single stage shown in FIG. 1A can be made the same.

Those shown in FIG. 2 (a) as an example of a multi-stage shape is the case of a two-stage, the inlet-side cutting recess 12 of the inlet side of the large diameter cylindrical cutting recesses 4 provided behind the semicircular to the back the side cutting recess 13 are consecutively provided. As this case that uses a work cutting tool 1 is crowded difference the distal end side of the rod-shaped workpiece W to the inlet side cut recessed portion 12 in advance as shown in FIG. 2 (d) are formed into two stages by cutting against the distal end face on the back side cutting recess 13, the distal end side of the workpiece W is cut in a convex spherical along the inner shape of the cutting recesses 4 as shown in FIG. 2 (g).

(Work cutting tool in FIG. 2B and its use example)
The case also two-stage ones shown in FIG. 2 (b) as an example of a multi-stage shape, the inner circumferential surface of the cylindrical inlet side cutting recess 12 is curved inflatable outside, the back of the semicircular to the back side cutting recess 13 is provided continuously, the cutting unit 6 is provided on the inner peripheral surface 5 of the inlet-side cutting recess 12 and the rear-side cutting recess 13. As this case that uses a work cutting tool 1 is crowded difference the distal end side of the rod-shaped workpiece W to the inlet side cut recessed portion 12 in advance as shown in FIG. 2 (e) are formed into two stages pressing the tip end surface on the back side cutting recess 13, by rotating the workpiece cutting tool 1, the large diameter portion of the workpiece W shown in FIG. 2 (e) the cutting portion 6 of the inlet-side cutting recess 12 is cut, the small diameter portion is cut into a convex shape along the inner shape of the cutting recesses 4 as shown in FIG. 2 is cut in the back side cutting recess 13 (h) of the workpiece W.

(Work cutting tool of FIG. 2 (c) and its use example)
Those shown in FIG. 2 (c) as an example of a multi-stage shape is the case of the cutting recesses 4 are three-stage, the inner peripheral surface of the inlet-side cutting recess 12 is formed in the semicircular tapered inlet side to its inner small diameter semicircular intermediate cutting recess 14 than the cutting recess 12 is provided continuously, the back side cutting recess 13 of semicircular further small diameter in its back is continuously provided. When using this workpiece cutting tool 1, the inlet-side cutting recess 12, crowded difference the distal end side of the rod-shaped workpiece W that is molded in advance in a three-stage, as shown in FIG. 2 (f) pressing the tip end surface on the back side cutting recess 13, the inlet-side cutting recess 12 by rotating the cutting tool 1, an intermediate cutting recess 14, the back side cutting recess 13, along the inner surface shape of the cutting recesses 4 It is cut into a convex shape.

Work cutting tool 1 shown in FIG. 2 (c), an inlet-side cutting recess 12, the intermediate cutting recess 14, the boundary portion of the back side cutting recess 13 is gently continuously and the workpiece can continuously push the inlet side cutting recess 12, the intermediate cutting recess 14, since is provided a cutting unit 6 for all of the inner peripheral surface 5 of the rear-side cutting recess 13, advance is not processed into cylindrical workpiece as shown in FIG. 2 (f) the cutting crowded difference on the inlet side cutting recess 12, as it is cut and push the workpiece to an intermediate cutting recess 14, further, by pushing the workpiece on the far side cutting recess 13, the inner surface of the cutting recesses 4 It can cut continuously in a convex shape along the shape.

(Work cutting tool in FIG. 3A and its use example)
A case 3 workpiece cutting tool also cutting recesses 4 shown in (a) is a three-stage, the inlet-side cutting recess 12 in the cylindrical recess, an intermediate cutting recess 14 slopes tapers to its destination and stepwise by the previously flat surface portion 16, the tip of the rear-side cutting recess 13 of the flat portion 16 in a concave conical thereof, the inlet-side cutting recess 12, the intermediate cutting recess 14, the back side cutting the cutting portion 6 on the inner peripheral surface of the recessed portion 13 is provided. If cutting crowded difference workpieces are molded in advance two stage as shown in the cutting recesses 4 in FIG. 3 (d), can cut the front end side of the workpiece W in a conical shape in the back side cutting recess 13, the middle portion of the workpiece W can be formed to slope at an intermediate cutting recess 14, the base side of the workpiece W can be cut into a cylindrical shape on the inlet side cutting recess 12.

(Work cutting tool in FIG. 3B and its use example)
Figure 3 workpiece cutting tool 1 illustrated in (b) is obtained by cutting recesses 4 five stages, and the inlet-side cutting recess 12 in a cylindrical shape, among the first intermediate cutting recess 14 in front of the previously the circumferential surface is on a slope, the second intermediate cutting recess 17 of the above, the inner peripheral surface of the third intermediate cutting recess 18 of the above the arcuate surface of the taper, the back side cutting recess 13 of the conical the recess, which inlet-side cutting recess 12, the intermediate cutting recess 14,17,18 is provided with a cutting portion 6 on the inner peripheral surface of the inner side cutting recess 13. Cutting this cutting recesses 4, if the cutting crowded difference the workpiece W that is molded in advance four stages as shown in FIG. 3 (e), the base side of the workpiece W in a cylindrical shape on the inlet side cutting recess 12 can, in an intermediate cutting recess 14,17,18 can cut the middle portion of the workpiece W on the slopes of three stages, it is possible to cut the tip of the workpiece W to the conical convex in the back side cutting recess 13.

Work cutting tool 1 shown in FIG. 3 (b) the inlet-side cutting recess 12, three intermediate cutting recess 14,17,18, the boundary portion of the back side cutting recess 13 is continuously slowly, continuously work There as can push the inlet side cutting recess 12, the intermediate cutting recess 14,17,18, since is provided a cutting unit 6 for all of the inner peripheral surface 5 of the rear-side cutting recess 13, in advance workpiece W cutting crowded difference the workpiece inlet side cutting recess 12 remains cylindrical without processing in multiple stages, the intermediate cutting recess 14,17,18 the workpiece as the cutting progresses, the rear-side cutting recess 13 The workpiece can be cut into a continuous convex shape along the shape of the inner surface of the cutting concave portion 4 by successively pushing in.

(Work cutting tool in FIG. 3C and its use example)
Figure 3 workpiece cutting tool 1 shown in (c) is obtained by cutting recesses 4 in three stages, and the inlet-side cutting recess 12 in a cylindrical shape, the flat portion 16a provided on the first, cylindrical to its destination the intermediate cutting recess 14 is provided, the flat portion 16b in the previously provided, the concave rear side cutting recess 13 of the conical provided ahead, their inlet-side cutting recess 12, the intermediate cutting recess 14, the back It is provided with a cutting portion 6 on the inner peripheral surface of the side cutting recess 13. This cutting recesses 4, 3 if the cutting crowded difference the workpiece W that is molded in advance three stages (f), the convex distal end side conical workpiece W at the far side cutting recess 13 is cut in the middle portion of the workpiece W is cut into a cylindrical shape at an intermediate cutting recess 14, the root side of the workpiece W is cut into a cylindrical shape on the inlet side cutting portion 12.

(Work cutting tool in FIG. 4A and its use example)
Figure 4 Work cutting tool 1 shown in (a) is obtained by cutting recesses 4 in two stages, the inlet-side cutting recess 12 and a cylindrical concave, the inner peripheral surface of the intermediate cutting recess 14 of the previous was the bulging arcuate slope slightly inward, the back side cutting recess 13 of the back and the concave conical and the rear side cutting recess 13 of the above conical inlet side cutting recess 12, the intermediate cutting concave portion 14 is provided with a cutting portion 6 on the inner peripheral surface of the inner side cutting recess 13. This cutting recesses 4, if the cutting push the cylindrical workpiece W shown in FIG. 4 (b), the cutting tip side of the workpiece W to the conical convex in the back side cutting recess 13, the inlet-side cutting base side of the workpiece W can be cut in a convex shape slope along the shape of the inlet-side cutting recess 12 in the recess 12. Also in this case, the columnar workpiece W shown in FIG. 4B can be pressed and continuously cut as the cutting progresses to obtain the cross-sectional shape shown in FIG.

(Work cutting tool in FIG. 5A and its use example)
Figure 5 Work cutting tool 1 shown in (a) is obtained by cutting recesses 4 in two stages, the inlet-side cutting recess 12 and the cylindrical concave, and stepwise arranged a flat portion 16 to its destination the back side cutting recess 13 back to the semicircular concave of the planar portion 16 is provided, which is provided with a chamfer cutting portion 19 in the boundary portion of the inlet-side cutting recess 12 and the flat portion 16. When the cylindrical workpiece W shown in FIG. 5 (b) is inserted into the cutting recess 4 and the tip surface thereof is pressed against the flat portion 16, the chamfered cutting portion 19 causes the workpiece W as shown in FIG. 5 (c). The outer peripheral edge of the tip is chamfered to form the inclined surface 20. The chamfered cutting portion 19 can also be provided at another location in the cutting recess 4.

  In the present invention, the number of steps, structure, shape, size, radius of arc, inclination angle of the slope, shape of the cutting blade, number of cutting blades, mounting position, cutting abrasive material, particle size, mounting density, etc. are necessary. It can be designed accordingly, but the parts common to both can be the same.

  The shape, size, material, and the like of the workpiece to be cut with the workpiece cutting tool of the present invention can be arbitrarily selected. The shape may be any of a rod, a pipe, a block, a plate and the like, for example.

  In the above-described embodiment, the case where the columnar workpiece W is cut is described as an example. However, the workpiece W may be a pipe-shaped (cylindrical) shape. May be. The present invention can also be used as a polishing tool for polishing a cut surface of a workpiece cut into a predetermined shape. In that case, the cutting blade or cutting abrasive provided on the inner peripheral surface of the cutting recess 4 is used instead of a polishing buff or other abrasive.

1 Work cutting tool 2 substrate 3 mounting shaft 4 cutting recess 5 the inner peripheral surface 6 the cutting unit 7 Cutting blade 7a cutting edge 8 reservoir space 9 cutting abrasive 10 outlet 12 inlet side cutting recess 13 rear side cutting recess 14 1 th intermediate cutting recess 16 flat portion 16a 1 th planar portion 16b second flat portion 17 second intermediate cutting recess 18 third intermediate cutting recess 19 chamfer cutting portion 20 slopes W workpiece

Claims (9)

A cutting recess capable of inserting a workpiece is formed in a cutting tool base that can be mounted on a rotating device, and a cutting portion such as a cutting blade or cutting abrasive grain is provided on the inner peripheral surface of the cutting recess. In a workpiece cutting tool in which a workpiece is inserted into a cutting recess and pressed against the cutting portion, the workpiece insertion portion is cut or polished along the inner peripheral surface shape of the cutting portion.
The workpiece is a rod-shaped or rod-shaped base with a tip that is thinner than the base formed at the tip,
The cutting recess has a hole shape into which a workpiece can be inserted, and a depth-side cutting recess that is thinner than the entrance-side cutting recess is formed at the tip of the entrance-side cutting recess,
The entrance-side cutting recess has a width and shape that allows the tip of the workpiece to pass but the base of the workpiece abuts, and the back-side cutting recess has a width and shape that can press the tip of the workpiece,
Cutting portions such as cutting blades and cutting abrasive grains are provided on the inner peripheral surface of the inlet-side cutting recess and the inner peripheral surface of the rear-side cutting recess,
The cutting portion of the inlet-side cutting recess can cut the base of the workpiece pressed against it along the inner peripheral surface shape of the inlet-side cutting recess during the rotation of the cutting tool base,
The cutting portion of the back side cutting recess can cut the tip of the workpiece pressed against it along the inner peripheral surface shape of the back side cutting recess during rotation of the cutting tool base.
A workpiece cutting tool characterized by that. The work cutting tool according to claim 1,
The inlet side cutting recess is cylindrical, the back side cutting recess is hemispherical concave,
A workpiece cutting tool characterized by that. In the workpiece cutting tool according to claim 1 or 2,
The rear side cutting recess is formed in a stepped shape in cross section at the tip of the entrance side cutting recess,
A workpiece cutting tool characterized by that. A cutting recess capable of inserting a workpiece is formed in a cutting tool base that can be mounted on a rotating device, and a cutting portion such as a cutting blade or cutting abrasive grain is provided on the inner peripheral surface of the cutting recess. In a workpiece cutting tool in which a workpiece is inserted into a cutting recess and pressed against the cutting portion, the workpiece insertion portion is cut or polished along the inner peripheral surface shape of the cutting recess.
The work has a rod-shaped base portion with an intermediate portion that is thinner than that, and a tip portion that is thinner than that with the middle portion.
The cutting recess is a hole shape into which a workpiece can be inserted, and an entrance side cutting recess, an intermediate cutting recess and a back side cutting recess are formed from the entrance side to the back side,
The inlet side cutting recess can pass through the tip and middle of the workpiece, but the base of the workpiece has a width and shape to press against, and the intermediate cutting recess can pass through the tip of the workpiece but the middle of the workpiece abuts wide. And the back side cutting recess has a width and shape that can press the tip of the workpiece,
Cutting portions such as cutting blades and cutting abrasive grains are provided on the inner peripheral surfaces of the entrance-side cutting recess, the intermediate cutting recess, and the back-side cutting recess,
The cutting portion of the entrance-side cutting recess can cut the base of the workpiece pressed against it along the inner peripheral surface shape of the entrance-side cutting recess during rotation of the cutting tool base,
The cutting part of the intermediate cutting recess can cut the intermediate part of the work pressed against it along the inner peripheral surface shape of the intermediate cutting recess during rotation of the cutting tool base,
The cutting portion of the back-side cutting recess can cut the tip of the workpiece pressed against it along the inner peripheral surface shape of the back-side cutting recess during rotation of the cutting tool base.
A workpiece cutting tool characterized by that. In the workpiece cutting tool according to claim 4,
The inlet side cutting recess and the intermediate cutting recess are cylindrical, and the back side cutting recess is a hemispherical concave shape or a sharp cylindrical shape,
A workpiece cutting tool characterized by that. In the workpiece cutting tool according to claim 4,
The inlet side cutting recess is cylindrical, the intermediate cutting recess is a tapered taper, the back cutting recess is a sharp cylinder,
A workpiece cutting tool characterized by that. A cutting recess capable of inserting a workpiece is formed in a cutting tool base that can be mounted on a rotating device, and a cutting portion such as a cutting blade or cutting abrasive grain is provided on the inner peripheral surface of the cutting recess. In a workpiece cutting tool in which a workpiece is inserted into a cutting recess and pressed against the cutting portion, the workpiece insertion portion is cut or polished along the inner peripheral surface shape of the cutting recess.
The workpiece is formed with two or more intermediate parts thinner than the intermediate part on the tip of the rod-shaped base, the intermediate part of the two or more stages is thinner than the intermediate part on the front side, and the intermediate part on the front side. The tip part thinner than that was formed first,
The cutting recess is in the shape of a hole into which a workpiece can be inserted, and an entrance-side cutting recess, two or more intermediate cutting recesses and a back-side cutting recess are formed from the inlet side to the back side, and two or more intermediate cutting recesses are the inlet A narrower intermediate cutting recess is formed at the tip of the intermediate cutting recess on the side,
The entrance-side cutting recess can pass through the tip of the workpiece and the intermediate portion of two or more stages, but the base of the workpiece has a size and shape to press against, and the intermediate cutting recess of two or more steps can pass through the tip of the workpiece. The intermediate part of two or more steps of the workpiece has a width and shape to abut, and the back side cutting recess has a width and shape that can press the tip of the workpiece,
Cutting portions such as cutting blades and cutting abrasive grains are provided on the inner peripheral surfaces of the inlet-side cutting recesses, the intermediate cutting recesses of two or more stages, and the back-side cutting recesses,
The cutting portion of the inlet-side cutting recess can cut the base of the workpiece pressed against it along the inner peripheral surface shape of the inlet-side cutting recess during rotation of the cutting tool base,
The cutting portions of the two or more intermediate cutting recesses are formed into the inner peripheral surface shape of the two or more intermediate cutting recesses during rotation of the cutting tool base. Can be cut along,
The cutting portion of the back side cutting recess can cut the tip of the workpiece pressed against the cutting portion along the inner peripheral surface shape of the back side cutting recess during rotation of the cutting tool base.
A workpiece cutting tool characterized by that. The work cutting tool according to claim 7,
At least two or more intermediate cutting recesses are tapered curved cylindrical shapes, and the back side cutting recesses are hemispherical concave shapes,
A workpiece cutting tool characterized by that. The work cutting tool according to claim 7,
At least the intermediate cutting recesses of two or more stages are tapered with a tapered taper surface, and the back side cutting recess is a sharp cylindrical shape,
A workpiece cutting tool characterized by that.

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