End tooling

Abstract

The present invention provides an end-processing tool for flattening the end faces of multiple types of cylindrical bodies having different diameters. [Solution] The end processing tool 1 comprises a holder 2 having a plate-shaped holder body 20, a plurality of insertion holes 31a to 37a formed through the thickness direction of the holder body 20, having hole diameters corresponding to the diameter of each cylindrical body to be cut, and allowing the cylindrical body to rotate circumferentially around its axis when inserted, and a cutting body 4 provided on the side of the holder 2 from which the cylindrical body is led out when the cylindrical body is inserted into each of the insertion holes 31a to 37a, made of a metal block, formed by cutting out the surface of the block at a position opposite to the insertion holes 31a to 37a, and equipped with a cutting edge 43a that contacts the end face of the cylindrical body led out from the insertion holes 31a to 37a and turns the end face to a flat shape, and a positioning structure that specifies the positional relationship between each of the insertion holes 31a to 37a and the cutting body 4.

Description

Technical Field

[0001] The present invention relates to an end processing tool for turning and processing the ends of a plurality of types of rod-shaped cylinders having different diameters.

Background Art

[0002] Conventionally, when assembling plastic models, architectural models, etc., it may be necessary to process the end face of a resin rod-shaped cylinder into a flat shape with high precision, or to chamfer the corners of the ends of the cylinder. On the other hand, in the field of machining, for example, as a jig used for machining the end face of a rod-shaped cylinder made of glass, resin, or metal into a flat shape, or a device for chamfering the corners of the ends of the cylinder, the technologies disclosed in Patent Documents 1 and 2 shown below are known.

[0003] Patent Document 1 discloses an invention related to a processing jig named "processing jig" and used for polishing both end faces of a cylindrical glass rod or the like. The processing jig disclosed in Patent Document 1 includes a rod holding plate having a V-shaped rod holding groove formed in the plate thickness direction, a pressing plate disposed corresponding to the rod holding groove and pressing the rod against both side walls of the groove, a moving means for moving the pressing plate closer to and away from the rod holding groove, and a dummy glass fixed to the peripheral portion of the rod holding groove on the polishing side surface of the rod holding plate.

[0004] Patent Document 2 discloses an invention related to a technique for improving a centerless grinding machine and chamfering the edge of the end of a cylindrical workpiece, named "chamfering method and chamfering device". The chamfering apparatus disclosed in Patent Document 2 is a centerless grinding machine comprising a regulating grinding wheel, which is a grinding wheel that contacts the outer circumferential surface of a cylindrical workpiece, and a grinding wheel, which is a grinding wheel that contacts the workpiece, wherein a workpiece holder is provided having a concave cylindrical surface with a radius dimension approximately equal to the sum of the diameter dimension of the cylindrical workpiece and the radius dimension of the regulating grinding wheel, and the machine comprises a grinding wheel that contacts the vicinity of the end of the cylindrical workpiece, which is sandwiched between the concave cylindrical surface of the workpiece holder and the outer circumferential surface of the regulating grinding wheel and rolling, to grind the edge of the end. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Publication No. 63-189561 [Patent Document 2] Japanese Patent Publication No. 2003-170339 [Overview of the project] [Problems that the invention aims to solve]

[0006] The invention disclosed in Patent Document 1 is suitable for polishing the end face of a cylindrical body to make it flat, but it is not suitable for chamfering the corners of the end of a cylindrical body. On the other hand, the invention disclosed in Patent Document 2 can chamfer the corners of the ends of a cylindrical body, but it cannot process the end faces of the cylindrical body to be flat. Therefore, when considering prior art and when it is desired to chamfer the corners of the end face of a cylindrical body after flattening the end face, it is uneconomical to prepare a polishing device having the invention (processing jig) disclosed in Patent Document 1 and a chamfering device disclosed in Patent Document 2. Furthermore, when individuals assemble plastic models or architectural models as a hobby, it is not practical to prepare a polishing device equipped with the invention (processing jig) disclosed in Patent Document 1 and a chamfering device disclosed in Patent Document 2 in order to flatten the end faces of a very small number of rod-shaped cylindrical bodies and then chamfer the corners of the ends of these cylindrical bodies.

[0007] This invention addresses the aforementioned conventional circumstances and aims to provide an end-processing tool that has a simple structure, facilitates the processing of the ends of multiple types of rod-shaped cylindrical bodies with different diameters, and is highly versatile. [Means for solving the problem]

[0008] The first invention for solving the above problems is an end-processing tool for processing the ends of multiple types of rod-shaped cylindrical bodies having different diameters, and is characterized by comprising: a plate-shaped holder body; a holder having a plurality of insertion holes formed through the thickness direction of the holder body, each having a hole diameter corresponding to the diameter of the cylindrical body to be cut, and allowing the cylindrical body to rotate circumferentially around its axis when inserted; a blade body provided on the side from which the cylindrical body is led out when the cylindrical body is inserted into the insertion hole, made of a block of metal or hard ceramic, formed by cutting out the surface of the block at a position opposite to the insertion hole, and equipped with a cutting edge that contacts the end of the cylindrical body led out from the insertion hole and turns the end into a desired shape; and a positioning structure that specifies the positional relationship between each insertion hole and the blade body. In the first invention with the above configuration, each through-hole formed in the holder body has the function of individually holding multiple types of rod-shaped cylindrical bodies having different diameters, and allowing each cylindrical body to rotate circumferentially around its axis. Furthermore, the cutting edge formed on the blade body contacts the end of the cylindrical body that is led out from the through hole, and when the cylindrical body is rotated circumferentially around its axis in this state, it has the effect of turning and processing the end of the cylindrical body to the desired shape. In addition, the first invention allows the processed shape of the end of the cylindrical body to be changed by changing the shape of the cutting edge as desired. Furthermore, in the first invention, by changing the mounting position of the cutting edge on the holder, the ends of the cylindrical bodies leading out from each through hole can be turned using a single cutting edge 4. Furthermore, because the first invention has a positioning structure, when positioning the cutting tool in a location where it is possible to turn the ends of the cylindrical bodies led out from each through hole, the positional relationship between the holder and the cutting tool can be determined so that the position of the cutting edge on the through hole is appropriate.

[0009] The second invention is the first invention described above, characterized in that the cutting edge is formed by cutting out a surface in a block constituting the blade body at a position opposite to the insertion hole, is arranged in a direction perpendicular to the center line of the insertion hole, and is a first cutting edge capable of contacting the end face of a cylindrical body led out from the insertion hole in a flattened manner. In the second invention with the above configuration, the first cutting blade contacts the end face of the cylindrical body that is led out from the through hole, and in this state, when the cylindrical body is rotated circumferentially around its axis, it has the function of turning the end face of the cylindrical body to make it flat. Therefore, according to the second invention, an end-processing tool can be provided that can process the end face of a cylindrical body into a flat shape.

[0010] The third invention is the first invention described above, characterized in that the cutting edge is formed by cutting out a surface in a block constituting the blade body at a position opposite to the insertion hole, the angle θ1 with respect to the center line of the insertion hole is 1° ≤ θ1 < 90°, and the second cutting edge is capable of contacting the corner (edge) of the end of the cylindrical body derived from the insertion hole in a chamfering manner. In the third invention with the above configuration, the second cutting blade contacts the corner (edge) of the end of the cylindrical body that is led out from the through hole, and in this state, when the cylindrical body is rotated circumferentially around its axis, it turns and chamfers the corner of the end of the cylindrical body. Therefore, according to the third invention, an end-processing tool can be provided that can chamfer the corners of the ends of a cylindrical body.

[0011] The fourth invention is the second invention described above, wherein the planar shape of the blade body is rectangular, and it is provided with a first cutting edge at one end in the longitudinal direction and a second cutting edge at the other end, and when the blade body is installed, the holder has through holes formed at a position facing the first cutting edge and a position facing the second cutting edge, and the second cutting edge is formed by cutting out the face of the block constituting the blade body at a position facing the through hole, and the angle θ1 made with the center line of the through hole is 1° ≤ θ1 < 90°, and it is in contact with the corner of a cylindrical body derived from the through hole. The fourth invention, with the above configuration, is characterized by the blade body having both a first cutting edge and a second cutting edge, which allows the end faces of multiple types of rod-shaped cylindrical bodies with different diameters to be flattened using the end processing tool of the fourth invention, and further allows the corners (edges) of the ends of these cylindrical bodies to be chamfered. In other words, according to the fourth invention, a highly versatile end processing tool can be provided that can perform two different types of processing using a single end processing tool.

[0012] The fifth invention is any of the first to fourth inventions described above, characterized in that the holder and the blade are fixed by a screw that penetrates them in the thickness direction, and the plurality of through holes are formed on a first circumference centered on the axis of the screw when the holder and the blade are fixed by the screw. In the fifth invention of the above configuration, multiple through holes are arranged on concentric circles (on the first circumference) centered on the axis of the screw when the holder and the blade body are fixed with the screw. In this case, the planar size of the holder can be made relatively smaller compared to the case where multiple through holes are formed in the holder in a straight line at desired intervals. Therefore, according to the fifth invention, it is advantageous for miniaturizing the end processing tool.

[0013] The sixth invention is the fifth invention described above, wherein the positioning structure is a fitting structure including a male structure or a female structure formed on the blade body and a female structure or a male structure formed on the holder, and the female structure or the male structure formed on the holder is arranged on a second circumference centered on the axis of the screw when the holder and the blade body are fixed with a screw. In the sixth invention with the above configuration, by using a fitting structure of a male structure and a female structure as the positioning structure, the shape of the blade body or the holder can be simplified. Therefore, according to the sixth invention, the manufacturing cost of the end processing tool can be reduced.

Effects of the Invention

[0014] According to each of the first to fourth inventions as described above, a highly versatile end processing tool can be provided that can process the ends of a plurality of types of bar-shaped cylinders having different diameters as desired using one type of mechanism. That is, when the cutting edge of the blade body is, for example, the first cutting edge (= the second invention), an end processing tool can be provided that can process the end faces of a plurality of types of bar-shaped cylinders having different diameters into a flat shape. Also, when the cutting edge of the blade body is, for example, the second cutting edge (= the third invention), an end processing tool can be provided that can chamfer the corners of the ends of a plurality of types of bar-shaped cylinders having different diameters. Furthermore, when the blade body includes both the first cutting edge and the second cutting edge (= the fourth invention), a more versatile end processing tool can be provided that can process the end faces of a plurality of types of bar-shaped cylinders having different diameters into a flat shape using one end processing tool, and furthermore, can chamfer the corners of the ends of these cylinders.

[0015] According to the fifth invention, the planar size of the holder can be reduced. Also, the planar size of the blade body does not exceed the planar size of the holder. Therefore, according to the fifth invention, an end processing tool having a simple structure and being small-sized can be provided.

[0016] According to the sixth invention, the form of the positioning structure can be simplified. In this case, since it is not necessary to perform complicated and costly processing during the manufacture of the holder or the blade body, the manufacturing cost of the holder or the blade body can be reduced. Therefore, according to the sixth invention, the manufacturing cost of the end machining tool can be reduced.

Brief Description of the Drawings

[0017] [Figure 1] It is a perspective view of the end machining tool according to this embodiment. [Figure 2] It is a perspective view of the end machining tool according to this embodiment in a disassembled state. [Figure 3] It is a plan view of the holder of the end machining tool according to this embodiment. [Figure 4A] It is a perspective view of the blade body in the end machining tool according to this embodiment as viewed from the upper surface side. [Figure 4B] It is a perspective view of the blade body in the end machining tool according to this embodiment as viewed from the lower surface side. [Figure 5] It is a plan view for explaining the positional relationship between the blade body and each through hole in the end machining tool according to this embodiment. [Figure 6] It is a perspective view showing a state in which the end face of a cylindrical body is machined flat using the end machining tool according to this embodiment. [Figure 7] It is a partial cross-sectional view taken along line X-X in FIG. 6. [Figure 8] It is a perspective view showing a state in which the corner of the end of a cylindrical body is chamfered using the end machining tool according to this embodiment. [Figure 9] It is a partial cross-sectional view taken along line Y-Y in FIG. 6. [Figure 10] It is a cross-sectional view of the first cutting edge according to the modified example, taken in a state where the blade body is installed in the holder, passing through the longitudinal direction of the blade body and cutting in the thickness direction of the blade body. [Figure 11] It is a perspective view of the second cutting edge according to the modified example.

Embodiments for Carrying Out the Invention

[0018] An end-processing tool according to an embodiment of the present invention will be described in detail with reference to Figures 1 to 11. Note that the following description of preferred embodiments is essentially illustrative.

[0019] [1; Regarding the basic configuration of the present invention] The structure of an end processing tool according to a typical embodiment of the present invention (hereinafter referred to as "this embodiment") will be described with reference to Figures 1 to 4B. The end processing tool 1 according to this embodiment is a tool used to process the ends of multiple types of rod-shaped cylindrical bodies (for example, made of resin) having different diameters. Such an end processing tool 1 consists of a holder 2 (see Figures 1 to 3) made of a resin plate-shaped holder body 20 with through holes 31a to 37a and 31b to 37b formed therein, through which multiple types (for example, 7 types) of rod-shaped cylindrical bodies of different diameters can be individually inserted; a blade body 4 (see Figures 1, 2, and 4A and 4B) made of a metal block 41 mounted on the upper surface 20a of the holder 2, having a first cutting blade 43a that turns the end faces of cylindrical bodies (not shown) led out from each of the through holes 31a to 37a to process them into a flat shape, and a second cutting blade 43b that turns the corners of the ends of cylindrical bodies (not shown) led out from each of the through holes 31b to 37b to process them into chamfered shapes; and a screw 8 (fixing device, see Figures 1 and 2) that penetrates the thickness direction of the holder 2 and the blade body 4 and fixes them together. Furthermore, the through holes 31a to 37a and 31b to 37b are formed to penetrate the thickness direction of the holder body 20.

[0020] Furthermore, the end processing tool 1 is equipped with a positioning structure 5 that determines the positional relationship between the holder 2 and the blade body 4 when fixing the blade body 4 to the upper surface 20a of the holder 2. This positioning structure 5 is a fitting structure consisting of a male structure which is a cylindrical projection 6 protruding from the lower surface of the blade body 4 made of a metal block 41, and a female structure which is a bottomed hole 71 to 77 formed on the upper surface 20a of the holder 2 and has a concave shape that fits with the projection 6.

[0021] As shown in Figures 2 and 3, the holder body 20 of the end processing tool 1 according to this embodiment is formed from a plate made of polyacetal resin into a circular shape, and a screw insertion hole 21 is formed at the center of the holder body 20 when viewed from the top surface 20a side, through which the threaded rod 9 of the screw 8, which is a fixing device, is inserted. As shown in Figure 3, when the holder body 20 is viewed from the top surface 20a side, through holes 31a to 37a and through holes 31b to 37b are formed on a first circumference P1 with radius R1 and centered at the center position C1 of the screw insertion hole 21, at desired intervals.

[0022] Furthermore, the through holes 31a to 37a all have different diameters. More specifically, as shown in Figures 2 and 3, the diameter of the holes decreases sequentially from through hole 31a to through hole 37a. Furthermore, the through holes 31b to 37b all have different diameters. More specifically, as shown in Figures 2 and 3, the diameter of the holes decreases sequentially from through hole 31b to through hole 37b. Furthermore, in the through holes 31a to 37a and 31b to 37b, when a cylindrical body to be processed is inserted into each of the through holes, the cylindrical body can be rotated circumferentially around its axis.

[0023] In addition, through holes 31a and 31b, 32a and 32b, 33a and 33b, 34a and 34b, 35a and 35b, 36a and 36b, and 37a and 37b have the same diameter. The through holes in each pair described above are further arranged so as to be point-symmetric with respect to the center position C1 of the screw insertion hole 21 when the holder 2 is viewed from its upper surface 20a side.

[0024] Furthermore, as shown in Figure 3, the holder 2 has bottomed holes 71 to 77 formed at desired intervals on a second circumference P2 with radius R2, centered at the central position C1 of the screw insertion hole 21. In holder 2, the radius R2 of the second circumference P2 in which the bottomed holes 71-77 are formed is set to be smaller than the radius R1 of the first circumference P1 (R1 <R2)。 In other words, when the cutting body 4 is mounted on the upper surface 20a of the holder 2, the positioning structure 5 (projection 6 and bottomed holes 71-77) is positioned between the center position C1 of the screw insertion hole 21 and the first circumference P1. At this time, the distance from the center position C1 of the screw insertion hole 21 to the center position C2 of each bottomed hole 71-77 is constant and R2. Although not shown in the diagram, the bottomed holes 71-77 may also be through holes.

[0025] The blade body 4 consists of a block 41 made of a hard metal such as steel and shaped like a rectangular parallelepiped, and is equipped with a first cutting edge 43a at one end in the longitudinal direction and a second cutting edge 43b at the other end. More specifically, as shown in Figures 1, 2, 4A, and 4B, the first cutting edge 43a is formed by cutting out (first notch 42a) one end 41a in the longitudinal direction of a rectangular parallelepiped block 41 that constitutes the blade body 4, and the surface facing the upper surface 20a of the holder 2. Furthermore, when the blade body 4 is mounted on the holder 2, the first cutting edge 43a is positioned perpendicular to the center line of the through hole (any of the through holes 31a to 37a) and is formed to contact the end face of the cylindrical body that is led out from the through hole.

[0026] Furthermore, as shown in Figures 1, 2, 4A, and 4B, the second cutting edge 43b is formed by cutting out (second notch 42b) the other end 41b in the longitudinal direction of the rectangular parallelepiped block 41 that constitutes the blade body 4, and the surface facing the upper surface 20a of the holder 2. The second cutting edge 43b is formed such that, when the blade body 4 is mounted on the holder 2, the angle θ1 it makes with respect to the center line of the through hole (any of the through holes 31b to 37b) is 1° ≤ θ1 < 90° (see Figures 4A and 4B), more preferably 30° ≤ θ1 < 90° (see Figures 4A and 4B), and it contacts the corner of the cylindrical body derived from the through hole (any of the through holes 31b to 37b). Furthermore, if the above θ1 is close to 1°, in order to maintain the strength of the blade body 4, it is preferable to give thickness to the side surface S (see Figures 4A and 4B) of the block 41 that constitutes the blade body 4 on the side where the second notch 42b is not formed (not shown).

[0027] In addition, the blade body 4 has a screw hole 44 formed at the longitudinal center of the rectangular block 41 into which the screw rod 9 of the fixing device, the screw 8, is screwed. This screw hole 44 is formed to penetrate the thickness direction of the block 41, that is, the thickness direction of the holder 2 when the blade body 4 is mounted on the upper surface 20a of the holder 2. Furthermore, the blade body 4 has a cylindrical projection 6 protruding from the surface of the rectangular block 41 that faces the upper surface 20a of the holder 2.

[0028] [2; Regarding the method of use of the present invention] The method of using the end processing tool 1 according to this embodiment will be described with reference to Figures 5 to 9. For example, as shown in Figures 5 and 6, when the projection 6 protruding from the blade body 4 of the end processing tool 1 according to this embodiment is fitted into the bottomed hole 71, and the holder 2 and the blade body 4 are fixed together with a screw 8 in this state, the end face of the cylindrical body to be processed, which is led out from the through hole 31a to the upper surface 20a side of the holder 2, can be turned with the first cutting edge 43a to process it into a flat shape. More specifically, in the state shown in Figure 6, the cylindrical body 11 is inserted through the through hole 31a from the lower surface 20b side of the holder 2 (see Figures 6 and 7), its end face 11b is brought into contact with the first cutting edge 43a, and then the cylindrical body 11 is rotated circumferentially around its axis (in the direction indicated by the symbol Q in Figures 6 and 7), thereby processing the end face 11b of the cylindrical body 11 into a flat shape.

[0029] Furthermore, if the position of the cutting edge 4 in the holder 2 is the same as described above, and the cylindrical body to be processed is led out from the through hole 31a towards the upper surface 20a side of the holder 2, the corners of the cylindrical body can be turned and chamfered using the second cutting edge 43b. More specifically, in the state shown in Figure 8, the cylindrical body 11 is inserted through the through hole 31b from the lower surface 20b side of the holder 2 (see Figures 8 and 9), and after the corner 11c of its end 11a is brought into contact with the second cutting edge 43b of the blade body 4, the cylindrical body 11 is rotated circumferentially around its axis (in the direction indicated by the symbol Q in Figures 8 and 9) to form a chamfered portion 11d on the corner 11c of the end 11a of the cylindrical body 11.

[0030] In other words, with the end processing tool 1 according to this embodiment, the end face 11b of the cylindrical body 11 can be processed into a flat shape by inserting the cylindrical body 11 through the through hole 31a of the holder 2 and rotating it in the circumferential direction around its axis. After this, the cylindrical body 11 can be removed from the through hole 31a, inserted into the through hole 31b, and rotated circumferentially around its axis, thereby chamfering the corner 11c of the end 11a of the cylindrical body 11.

[0031] Furthermore, in the end processing tool 1 according to this embodiment, the position of the first cutting edge 43a moves sequentially over the through holes 32a to 37a by fitting the projections 6 protruding from the cutting edge 4 into the respective bottomed holes 71 to 77 formed on the upper surface 20a of the holder 2 while sequentially moving the cutting edge 4. In conjunction with this, the position of the second cutting edge 43b also moves sequentially over the through holes 32b to 37b (see Figure 5). In other words, using a single cutting edge 4, the end faces of the cylindrical bodies derived from each of the through holes 32a to 37a can be flattened by the first cutting edge 43a. In addition, using a single cutting edge 4, the corners of the ends of the cylindrical bodies leading out from each of the through holes 32b to 37b can be chamfered by the second cutting edge 43b.

[0032] [3; Regarding the effects of the present invention] According to the end processing tool 1 of this embodiment, not only can the end faces 11b of multiple types of rod-shaped cylindrical bodies 11 having different diameters be processed into a flat shape using a single end processing tool, but the corners 11c of the ends 11a of these cylindrical bodies 11 can also be chamfered. Therefore, the end processing tool 1 provides a highly versatile end processing tool.

[0033] Furthermore, the end processing tool 1 according to this embodiment is composed of three parts: a holder 2, a cutting edge 4, and a screw 8 (fixing device), making its structure extremely simple. Furthermore, the end processing tool 1 can be miniaturized by having a circular planar shape for the holder 2 and configuring the cutting edge 4 to rotate in the circumferential direction of the holder 2 with respect to the axis of the threaded rod 9 that constitutes the screw 8. Therefore, a compact, portable, and highly storable end processing tool 1 can be provided.

[0034] [4; Regarding modifications of the present invention, etc.] (Regarding the positioning structure) In this embodiment, the position of the blade body 4 in the holder 2 is described using a positioning structure 5 (fitting structure) consisting of a cylindrical projection 6 (male structure) protruding from the blade body 4 and bottomed holes 71-77 (female structure) formed on the upper surface 20a of the holder 2 as an example. However, the same effect can be obtained by replacing the male structure and the female structure. Furthermore, when using a cylindrical projection 6 (on the blade body 4 side) and a bottomed hole 71-77 (on the holder 2 side) as the positioning structure 5, as shown in Figure 2, the structure of the blade body 4 and the holder 2 becomes simpler, thereby improving the productivity of the end processing tool 1. Therefore, the end processing tool 1 according to this embodiment can be provided at a low cost. Furthermore, the shapes of the male and female structures in the positioning structure 5 may be other than those shown in the drawings of this embodiment. In this case, the productivity of the end processing tool 1 may decrease, but the functionality will be comparable.

[0035] In addition to the above, the positioning structure 5 may also be configured to partially embed the lower surface of the blade body 4 in the thickness direction into the upper surface of the holder 2 (however, the planar shape of this recess corresponds to the planar shape of the blade body 4), thereby enabling the blade body 4 to be positioned on the upper surface 20a of the holder 2. In this case as well, the same effects will be achieved.

[0036] (Regarding the blade) In this embodiment, the case where a metal (e.g., steel) blade 4 is used is described as an example, but the blade 4 may also be made of hard ceramics. In this case, especially when the cylindrical body 11 is made of resin, the end portion 11a of the cylindrical body 11 can be processed without any problems.

[0037] Furthermore, in this embodiment, the case in which both the first cutting edge 43 and the second cutting edge 43b are provided on the block 41 constituting the blade body 4 is described as an example, but the block 41 may be provided with only the first cutting edge 43a or only the second cutting edge 43b. In the former case, it is not necessary to form through holes 31b to 37b in the holder 2, and in the latter case, it is not necessary to form through holes 31a to 37a in the holder 2. In either case, although the versatility of the end processing tool 1 is reduced compared to the case where the blade body 4 is equipped with both the first cutting edge 43a and the second cutting edge 43b, the functions of flattening the end face 11b of the cylindrical body 11 or chamfering the corners of the end 11a of the cylindrical body 11 are performed without any problems.

[0038] In this embodiment, the case in which the blade body 4 is equipped with a first cutting edge 43a and a second cutting edge 43b is given as an example, but the cutting edges formed on the blade body 4 may be other than those described above. More specifically, the blade body 4 may have, for example, a cutting edge capable of performing "outer shape cutting" (including "end face cutting" and "face cutting") to form a region with a smaller diameter on the end 11a side of the cylindrical body 11, "taper cutting" to reduce the diameter of the end 11a side of the cylindrical body 11 toward the end face 11b, "grooving" to form a groove on the circumferential direction of the end 11a side of the cylindrical body 11 in which the cross section perpendicular to the axial direction of the cylindrical body 11 is concave, "parting" to cut the end 11a side of the cylindrical body 11 to a desired length, "male thread cutting" to form a male screw structure on the circumferential surface of the end 11a side of the cylindrical body 11, and "boring" or "center hole" to form a bottomed hole on the end face 11b side of the cylindrical body 11, either individually or two desired cutting edges selected from these.

[0039] Furthermore, since the end processing tool 1 of this embodiment allows the blade body 4 to be removed from the holder 2, a separate blade body 4 may be prepared with cutting blades other than the first cutting blade 43a and the second cutting blade 43b, or with two desired types of cutting blades, and the type of turning applied to the end 11a of the cylindrical body 11 may be selected as desired by changing the blade body 4. In this case, the end processing tool 1 of this embodiment consists of one holder 2 and two or more cutting bodies 4 equipped with the desired cutting edge.

[0040] (Regarding the shape of the first cutting edge) If the blade body 4 is equipped with a first cutting edge 43a, it may further have the following features. With the blade body 4 mounted on the holder 2, when the blade body 4 and the holder 2 are cut in the direction passing through the longitudinal direction of the blade body 4 and in the thickness direction of the blade body 4, the cross-section (see Figure 7) (however, in this cross-section, the center line of the through hole 31a and the rake face 46 of the blade body 4 are both arranged vertically), the angle θ2 (= cutting edge angle) made by the relief face 45 with respect to the vertically arranged rake face 46 of the first cutting edge 43a may be set to θ2 < 90°, more preferably θ2 = 85°. In this case, compared to setting θ2 = 90°, the first cutting edge 43a can be made sharper, so the end face 11b of the cylindrical body 11 can be efficiently machined to be flat.

[0041] Furthermore, in the same cross-section, the rake face 46 of the first cutting edge 43a does not necessarily have to be positioned vertically; it may be formed at an angle of θ3 (= rake angle) with respect to the vertical. The size of this rake angle θ3 can be appropriately changed depending on the material that makes up the workpiece to be turned. More specifically, it is preferable to set it to θ3 ≤ 20°. While a larger value of θ3 improves the cutting performance of the first cutting edge 43a, the cutting performance may be too good, causing the cutting edge of the first cutting edge 43a to bite into the workpiece during turning. Furthermore, in the first cutting edge 43a of the same cross-section, it is preferable to set the angle θ4 (=relief angle) made by the relief surface 45 with respect to the horizontal direction so that 0 < θ4. Note that if θ4 = 0, the cutting edge of the first cutting edge 43a may lift during turning, which is undesirable.

[0042] The first cutting edge 43a in the blade body 4 may further have the following features. In this embodiment, we take the example of a case where the cutting edge of the first cutting blade 43a, formed on one end 41a side of the blade body 4, is positioned on the side surface S of the block 41 (see Figures 4A and 4B above). In this case, there is a risk that during mass production or transport of the blade body 4, the cutting edge of the first cutting blade 43a may collide with other blocks 41 or the like that make up the blade body 4, causing it to be crushed and resulting in a defective blade body 4. In light of these circumstances, the modified first cutting blade 43a may have a notch 48 formed at the top of the block 41 constituting the blade body 4, which consists of three surfaces: the side surface S, the rake surface 46, and the relief surface 45, as shown in Figure 11. In this case, the cutting edge 49 of the first cutting blade 43a can be positioned slightly recessed, closer to the other side (not shown) opposite the side S of the block 41. In this case, the risk of the cutting edge 49 of the first cutting blade 43a becoming crushed and the blade body 4 becoming a defective product during mass production or transport of the blade body 4 equipped with the modified first cutting blade 43a can be significantly reduced. As a result, the yield of the end processing tool 1 according to this embodiment can be increased, and thus the productivity of the end processing tool 1 can be improved.

[0043] (Regarding the holder) In this embodiment, the case in which the holder body 20 is made of polyacetal resin is given as an example, but the material of the holder body 20 is not limited to the above resin, and metal or ceramics may also be used. In any case, the same effects will be achieved. Furthermore, if the holder body 20 is made of polyacetal resin, a holder 2 with excellent heat resistance and wear resistance can be provided. In this case, a durable end processing tool 1 can be provided.

[0044] Furthermore, in this embodiment, the planar shape of the holder 2 is made circular, and the example is given where the trajectories of the first cutting blade 43a and / or the second cutting blade 43b when the blade body 4 is moved on the upper surface 20a of the holder 2 are circular. However, the planar shape of the holder 2 does not need to be circular, and the trajectories of the first cutting blade 43a and / or the second cutting blade 43b when the blade body 4 is moved do not need to be circular. More specifically, if the total number of through holes formed in the holder 2 (for example, through holes 31a to 37a, through holes 31b to 37b, etc.) is particularly large, the planar shape of the holder 2 may be made into an elongated rectangle, and the trajectory of the first cutting edge 43a and / or the second cutting edge 43b when moving the blade body 4 may be made into a straight line parallel to the long side of the holder 2 (not shown). In this case, the holder 2 may have a number of screw insertion holes 21 corresponding to the number of through holes, or it may have one elongated hole that serves as both a screw insertion hole 21 and an elongated hole. When the end processing tool 1 according to this embodiment is configured as described above, even if the number of variations in the diameter of the cylindrical body to be processed exceeds seven, it is possible to process the ends 11a of various cylindrical bodies 11 having various diameters using a single end processing tool 1. [Industrial applicability]

[0045] As described above, the present invention is an end-processing tool that can process the ends of multiple types of rod-shaped cylindrical bodies having different diameters as desired, and is applicable in the technical field related to hand tools and the like. [Explanation of Symbols]

[0046] 1…End processing tool 20…Holder 20…Holder body 20a…Top surface 20b…Bottom surface 21…Screw insertion hole 31a~37a, 31b~37b…Through hole 4…Blade body 41…Block 41a…One end 41b…Other end 42a…First notch 42b…Second notch 43a…First cutting edge 43b…Second cutting edge 44…Screw hole 45…Relief face 46…Rake face 47…Top surface 48…Notch 49…Cutting edge 5…Positioning structure 6…Projection (male structure) 71~77…Bottomed hole (female structure) 8…Screw (fixing device) 9…Threaded rod 10…Operating part 11…Cylindrical body (workpiece) 11a…End 11b…End face 11c…Corner (edge) 11d... Chamfered area C1... Center position C2... Center position P1... First circumference P2... Second circumference

Claims

1. A tool for processing the ends of multiple types of rod-shaped cylindrical bodies having different diameters, A holder comprising a plate-shaped holder body, and a plurality of insertion holes formed through the thickness direction of the holder body, each having a hole diameter corresponding to the diameter of the cylindrical body to be cut, and allowing the cylindrical body to rotate circumferentially around its axis when inserted, In this holder, a cutting edge is provided on the side from which the cylindrical body is led out when the cylindrical body is inserted into the insertion hole, and is made of a block made of metal or hard ceramic, and is formed by cutting out the surface of the block at a position opposite to the insertion hole, and contacts the end of the cylindrical body led out from the insertion hole and turns this end into a desired shape, An end processing tool characterized by comprising a positioning structure that specifies the positional relationship between each of the aforementioned insertion holes and the cutting edge.

2. The end processing tool according to claim 1, characterized in that the cutting blade is formed by cutting out a surface in the block at a position opposite to the insertion hole, is arranged in a direction perpendicular to the center line of the insertion hole, and is a first cutting blade capable of contacting the end face of the cylindrical body led out from the insertion hole in a flattened manner.

3. The cutting edge is formed by cutting out a surface in the block at a position opposite to the insertion hole, and the angle θ it makes with respect to the center line of the insertion hole. １ 1°≦θ １ The end processing tool according to claim 1, characterized in that the second cutting blade is <90° and capable of contacting the corner of the cylindrical body led out from the through hole in a manner that chamfers the edge.

4. The planar shape of the blade body is rectangular, and it is provided with a first cutting edge at one end in the longitudinal direction and a second cutting edge at the other end. The holder has the insertion holes formed at a position facing the first cutting blade and a position facing the second cutting blade when the blade body is removed. The second cutting edge is formed by cutting out a surface in the block at a position opposite to the insertion hole, and at an angle θ with respect to the center line of the insertion hole. １ 1°≦θ １ The end processing tool according to claim 2, characterized in that it is <90° and contacts the corner of the cylindrical body led out from the through hole.

5. The holder and the blade are fixed together by screws that penetrate through them in the thickness direction. The end processing tool according to any one of claims 1 to 4, characterized in that the plurality of insertion holes are formed on a first circumference centered on the axis of the screw when the holder and the cutting body are fixed by the screw.

6. The positioning structure is a fitting structure consisting of a male or female structure formed on the blade body and a female or male structure formed on the holder. The end processing tool according to claim 5, characterized in that the female structure or male structure formed on the holder is arranged on a second circumference centered on the axis of the screw when the holder and the cutting body are fixed by the screw.

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