Shank member for replaceable head cutting tool, and cutting tool

Abstract

This overcomes the constraints imposed by the tool post specifications and increases the types and quantity of rod-shaped cutting members that can be installed on the tool post, thereby enabling multiple types of processing to be efficiently performed on workpieces and improving productivity. The shank member (10) of the head-exchangeable cutting tool (1) has an elongated shape and has heads (20) attached to both ends.

Description

[Technical Field]

[0001] The present disclosure relates to a shank member for a cutting tool with an exchangeable head, and a cutting tool including the shank member. [Background technology]

[0002] In automatic lathes, cutting tools with rod-shaped cutting members fixed to a holder are widely used to perform various processes, such as drilling, grooving, and turning, while rotating a workpiece (machined object). Examples of tool rests to which such cutting tools can be attached include rear tool rests, B-axis tool rests, and opposing tool rests. These tool rests are typically designed to accommodate multiple cutting tools to handle complex and diverse machining. However, cost constraints often limit the types and number of tool rests, and there are also restrictions on the types and number of tools that can be attached to the tool rest. As an example of addressing these issues, Patent Document 1, for example, proposes a configuration in which two rod-shaped cutting members are attached to a single holder. This provides a cutting tool that can perform multiple types of machining without increasing the number of tools attached to the tool rest. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-62006 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the cutting tool of Patent Document 1 still has the problem that the tool rests that can be used are limited. Specifically, as shown in Figures 6(A) and 6(B), a cutting tool 8A having one rod-shaped cutting member 81 fixed to the end of a holder 82A is configured to be inserted into a mounting hole 91 provided in a tool rest 9. However, if heads 82B having two cutting members 81 are provided on both ends of the holder 82A in order to increase the number of cutting members 81, as shown in Figure 7, for example, interference with the mounting hole 91 may occur, making it impossible to insert the cutting tool 8B into the mounting hole 91 of the tool rest 9 even when attempting to attach it.

[0005] Therefore, the present disclosure has been made in consideration of the above circumstances, and aims to provide a shank member that overcomes the specification constraints of the tool post and can increase the types and number of rod-shaped cutting members that can be installed on the tool post, thereby enabling multiple types of processing to be efficiently performed on a workpiece, and a cutting tool equipped with this shank member. [Means for solving the problem]

[0006] [1] An example of a shank member according to the present disclosure is a shank member of a head-exchangeable cutting tool, which has an elongated shape and has the head attached to both ends.

[0007] In this configuration, the head is detachably attached to the shank member. Therefore, after attaching the head to a shank member previously installed in the tool post, multiple cutting members can be attached to the head, or the head with multiple cutting members attached can be attached to the shank member. Therefore, even if the number of cutting members is increased and the head shape becomes larger, it is possible to avoid a situation where the cutting tool cannot be attached to the tool post 9 due to interference with the mounting hole 91 of the tool post 9, as with the conventional cutting tool 8B (see FIG. 7). As a result, it is possible to overcome the constraints imposed by the tool post specifications, increase the number and variety of rod-shaped cutting members that can be attached to the tool post, and enable tool exchange without selecting a specific type of tool post. This also makes it possible to efficiently perform multiple types of machining on a workpiece.

[0008] [2] More specifically, a mounting portion having a flat abutment surface for a part of the head may be provided. In this case, by pressing and fixing a part of the head (for example, a protrusion for mounting) against the flat abutment surface on the mounting portion of the shank member, the head can be held by the shank member, thereby forming a cutting tool with a compact shape.

[0009] [3] In this case, the mounting portion may have a recess into which a part of the head is inserted. In this case, the head can be firmly held by the shank member by further inserting a part of the head (for example, a protrusion for mounting) into the recess and fixing them together.

[0010] [4] In this case, a threaded hole may be provided that is drilled from the side of the recess so as to communicate with the recess and into which a screw for fixing the head to the shank member is threaded. This allows the screw for fixing the head to be housed inside the shank member, thereby reducing the size of the shank member. Furthermore, this configuration allows the screw to be appropriately positioned in an easily visible position, making it possible to reliably and easily perform the fastening operation of screwing the head to the shank member.

[0011] [5] More specifically, the screw holes may be provided at both ends of the side wall, which makes it easier to reliably fasten the shank member 10 and the head 20 to each other at a position close to where the two are attached.

[0012] [6] In the above configuration, the central axis of the recess may be configured to be approximately parallel to the direction in which the head is fixed to the shank member. Such a recess configuration allows for further miniaturization of the shank member structure and further reduces interference between the head and the workpiece, and with another cutting tool arranged adjacent to the tool post.

[0013] [7] An example of a cutting tool according to the present disclosure is a head-exchangeable cutting tool, comprising a head and a shank member according to the present disclosure having an elongated shape and having heads attached to both ends.

[0014] [8] In the above configuration, the head may have a mounting portion and a plurality of mounting holes to which the generally rod-shaped cutting member is attached. [Effects of the Invention]

[0015] According to the present disclosure, it is possible to overcome the constraints imposed by the tool post specifications and increase the types and number of rod-shaped cutting members that can be installed on the tool post, thereby enabling efficient execution of multiple types of machining on workpieces and improving productivity. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 1A is a perspective view showing a cutting tool 1 according to a first embodiment, and FIG. 1B is an exploded perspective view showing a part of the cutting tool 1. [Figure 2] 1A and 1B are a right side view and a bottom view, respectively, showing the cutting tool 1. FIG. [Figure 3] 1A to 1E are a right side view, a top view, a bottom view, a front view, and a rear view, respectively, showing a shank member 10 that constitutes the cutting tool 1. [Figure 4] 1A to 1E are a right side view, a top view, a bottom view, a front view, and a rear view, respectively, showing the head 20 and the cutting member 30 that constitute the cutting tool 1. [Figure 5] 1 is a side view schematically showing a state in which a cutting tool 1 is set on a tool rest. [Figure 6] 10(A) and 10(B) are side views each showing a schematic state before and after a conventional cutting tool 8A is attached to a tool rest. [Figure 7] FIG. 10 is a side view schematically showing a state before a conventional cutting tool 8B is attached to a tool rest. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, the present embodiment will be described with reference to the accompanying drawings. To facilitate understanding of the description, the same components in each drawing will be assigned the same reference numerals whenever possible, and redundant description will be omitted. Note that the following embodiments are examples for explaining the present disclosure, and are not intended to limit the present disclosure to only these embodiments. Furthermore, the present disclosure can be modified in various ways without departing from the gist thereof. Furthermore, a person skilled in the art can adopt embodiments in which the elements described below are replaced with equivalents, and such embodiments are also within the scope of the present disclosure.

[0018] FIG. 1(A) is a perspective view showing a cutting tool 1 according to a first embodiment, and FIG. 1(B) is an exploded perspective view showing a portion of the cutting tool 1. FIGS. 2(A) and 2(B) are a right side view and a bottom view, respectively, showing the cutting tool 1. FIGS. 3(A) to 3(E) are a right side view, a top view, a bottom view, a front view, and a back view, respectively, showing a shank member 10 constituting the cutting tool 1. FIGS. 4(A) to 4(E) are a right side view, a top view, a bottom view, a front view, and a back view, respectively, showing a head 20 and a cutting member 30 constituting the cutting tool 1. The coordinate axes shown in FIGS. 3 and 4 indicate the coordinate axes for FIGS. 3(A) and 4(A), respectively.

[0019] In addition, in this disclosure, for convenience, to explain relative directions, the coordinate axes shown in Figures 2(A), 3(A), 4(A), etc. are used as the reference, and the left direction as viewed from the front is referred to as the "forward X1," the opposite direction is referred to as the "rear X2," and these two directions may be collectively referred to as the "front-to-back direction X." In addition, in the same figures, the direction toward the front of the paper is referred to as the "rightward Y1," the opposite direction is referred to as the "leftward Y2," and these two directions may be collectively referred to as the "left-to-right direction Y." Furthermore, the upward direction is referred to as the "upward Z1," the opposite direction is referred to as the "downward Z2," and these two directions may be collectively referred to as the "up-down direction Z." Following these guidelines, a front view refers to the perspective of the cutting tool 1 mounted on the tool post as viewed from the front X1 toward the rear X2, and a rear view refers to the opposite perspective. The right side view refers to the viewpoint when the cutting tool 1 is viewed from the right Y1 to the left Y2, and the left side view refers to the viewpoint in the opposite direction. The top view refers to the viewpoint when the cutting tool 1 is viewed from the upper Z1 to the lower Z2, and the bottom view refers to the viewpoint in the opposite direction.

[0020] As shown in these figures, the cutting tool 1 according to this embodiment includes a shank member 10, two heads 20, and four cutting portions 30. The shank member 10 has a body portion 10D that extends linearly (in the front-rear direction X), and front and rear surfaces 10L, 10R (end surfaces) thereof are formed with recesses 11 into which protrusions 21 of the heads 20 (corresponding to an example of a "part of the head" in this disclosure) are inserted. The body portion 10D functions as the shank (the handle portion of the component) of the shank member 10. Furthermore, threaded holes 13 into which screws 12N for fixing the heads 20 are fitted are drilled at both ends of the right side surface 10F of the shank member 10. In other words, threaded holes 13 into which screws 12N for fixing the heads 20 to the shank member 10 are threaded are drilled at both ends of a side wall 14 of the body portion 10D so as to communicate with the recesses 11 from the sides. Additionally, keys 14a for positioning the head 20 are provided to protrude outward from the front surface 10L and the rear surface 10R of the body 10D.

[0021] Meanwhile, the head 20 has a protrusion 21 protruding from either the left or right side surface 10L, 10R, having a shape that can be inserted into the recess 11 of the shank member 10. The head 20 is attached to the shank member 10 with these recesses 11 and protrusions 12 fitted together, and the rear surface 20R around the protrusion 12 (the abutting plane thereon) abutting against the front surface 10L around the recess 11 (the abutting plane thereon). In this respect, the recess 11 of the shank member 10 corresponds to an example of a part of the "attachment portion" in the present disclosure, and the recess 11 and the abutting plane on the front surface 10L constitute an example of the "attachment portion" of the shank member in the present disclosure. A female thread portion 21N is machined into the body of this protrusion 21, into which the screw 12N of the shank member 10 is threadedly engaged. The head 20, excluding the protrusion 21, has a generally rectangular parallelepiped shape with a thickness Wh (width along the left-right direction Y in the figure) that is equal to the thickness Ws (width) of the shank member 10. Furthermore, a key groove 24a into which the key 14a fits is provided at the boundary between the right side surface 20F and the rear surface 20R of the head 20. With this structure, the shank member 10 and the head 20 can be aligned by fitting the key 14a into the key groove 24a, thereby simplifying and reliably attaching the head 20 to both ends of the shank member 10.

[0022] The head 20 also has two mounting holes 25 on its front surface 20L, into which rod-shaped tools 31 and 32 (which correspond to an example of a "substantially rod-shaped cutting member" in the present disclosure) constituting the cutting member 30 are attached, respectively. The mounting holes 25 are formed so that their central axes 25C are located within the thickness Ws (width) of the shank member 10 (FIG. 2B) and are arranged so that the central axes 25C are substantially parallel to a fixing direction 21C (front-rear direction X) of the head 20 to the shank member 10 (FIG. 1B). The dashed-dotted line indicating the fixing direction 21C in the drawing coincides with the central axis of the recess 11 (FIG. 1A). Therefore, the central axis of the recess 11 is also substantially parallel to the fixing direction of the head 20 to the shank member 10. Due to space limitations, the fixing direction 21C and the central axes 25C are not shown in FIGS. 3A and 4A.

[0023] Furthermore, the head 20 has thread length adjustment surfaces 20M between the right side surface 20F and the bottom surface 20K, and between the left side surface 20B and the top surface 20U, which are flat surfaces connecting these surfaces. The thread length adjustment surfaces 20M are flat surfaces that are approximately parallel to the heads of the screws 22N. Each thread length adjustment surface 20M is provided with two threaded holes 23 aligned along the axial direction of the mounting hole 25, into which screws 22N are fitted for fixing the rod-shaped tools 31, 32 to the head 20, respectively. In other words, the threaded holes 23, into which the screws 22N for fixing the rod-shaped tools 31, 32 to the head 20 are threaded, are drilled from the side of the mounting hole 25 at a predetermined angle with respect to the XZ plane so as to communicate with the mounting hole 25.

[0024] According to the first embodiment of the present disclosure configured as described above, a head-exchangeable cutting tool 1 is configured by removably attaching the head 20 to the shank member 10. Therefore, as shown in FIG. 5 , the head 20 can be attached to the shank member 10 that has been previously installed on the tool post 9, and then the cutting member 30 can be attached to the head 20, or the head 20 with the cutting member 30 attached can be attached to the shank member 10. Therefore, even if the size of the head 20 increases due to the increase in the number of rod-shaped cutting members that can be attached, a situation in which the cutting tool 1 cannot be attached to the tool post 9 due to interference with the mounting hole 91 of the tool post 9, as in the case of the conventional cutting tool 8B (see FIG. 7 ), can be avoided. As a result, the limitations imposed by the tool post specifications can be overcome, and the types and number of rod-shaped cutting members that can be attached to the tool post can be increased. Furthermore, tool exchange is possible regardless of the type of tool post. This allows for efficient processing of multiple types of workpieces, thereby improving productivity.

[0025] Furthermore, a protrusion 21 having a shape that can be inserted into the recess 11 of the shank member 10 is provided, and the head 20 is attached to the shank member 10 in a state where these recesses 11 and protrusions 12 fit together and the rear surface 20R around the protrusion 12 (the abutting plane thereon) abuts against the front surface 10R around the recess 11 (the abutting plane thereon). This allows the head 20 to be pressed against and fixed against the abutting plane of the shank member 10, realizing a cutting tool 1 with a compact shape and enabling the installation area of the cutting tool on the tool post to be reduced.

[0026] Furthermore, by fastening the protrusion 21 of the head 20 into the recess 11 of the shank member 10 with the screw 12N, the head 20 can be firmly held by the shank member 10.

[0027] Furthermore, a threaded hole 13 into which a screw 12N for fixing the head 20 to the shank member 10 is threaded is drilled so as to communicate with the side of the recess 11. This allows the screw 12N for fixing the head 20 to be housed inside the shank member 10, thereby realizing a more compact shank member 10. Furthermore, this configuration allows the screw 12N and the threaded hole 13 to be positioned so that they are easily visible, making it possible to reliably and easily perform the fastening operation of screwing the head 20 to the shank member 10.

[0028] Furthermore, screw holes 13 into which screws 12N for fixing the head 20 are inserted are drilled at both ends of the right side surface 10F of the shank member 10, which has the advantage of making it easier to securely fix the two at a position close to where the head 20 is attached to the shank member 10.

[0029] Furthermore, the central axis of the recess 11 of the shank member 10 is arranged to be approximately parallel to the fixing direction 21C (front-rear direction X) of the head 20 to the shank member 10 (FIG. 1(B)), which enables further miniaturization of the shank member 10. This further reduces interference between the head 20 and the workpiece, and interference with other cutting tools arranged adjacent to the tool post, thereby further increasing the installation density of cutting tools on the tool post and significantly improving productivity.

[0030] Furthermore, because the head 20, excluding the protrusion 21 (mounting portion), is generally rectangular, the entire head 20 can be configured to have a shape with a desired aspect ratio, as in this embodiment, and the head thickness Wh (width) can be reduced to be equal to or less than the shank member thickness Ws (width). This reduces the size and weight of the head 20, and when a cutting tool 1 with the head 20 mounted on the shank member 10 is installed on a tool post, interference with other cutting tools arranged adjacent to the tool post can be easily avoided. As a result, the installation density of cutting tools on the tool post can be further increased, further improving productivity. Furthermore, if the thicknesses of the shank member 10 and the head 20 are equivalent, the difference in height between the two surfaces of the shank member 10 and the head 20 can be eliminated, making it easier to reduce the thickness of the cutting tool 1. This further facilitates avoiding interference with other cutting tools arranged adjacent to the tool post when the cutting tool 1 is installed on the tool post.

[0031] Furthermore, since the central axis 25C of the mounting hole 25 is formed to be located within the thickness Ws of the shank member 10 (FIG. 2(B)), the structure of the head 20 can be further miniaturized. This further reduces interference between the head 20 and the workpiece, and interference with other cutting tools arranged adjacent to the tool post, thereby further increasing the installation density of cutting tools on the tool post and further improving productivity. In addition, in this case, the shank member 10 can support the cutting force applied to the cutting edges of the rod-shaped tools 31 and 32, thereby increasing the rigidity of the cutting tool 1.

[0032] Furthermore, the central axis 25C of the mounting hole portion 25 is arranged to be approximately parallel to the fixing direction 21C (front-rear direction X) of the head 20 to the shank member 10 (FIG. 1(B)), which enables further miniaturization of the head 20. This further reduces interference between the head 20 and the workpiece and with other cutting tools arranged adjacent to the tool post, thereby further increasing the installation density of cutting tools on the tool post and significantly improving productivity.

[0033] Furthermore, threaded holes 23 into which screws 22N for fixing the rod-shaped tools 31, 32 to the head 20 are threaded are drilled from the side of the mounting hole 25 at a predetermined angle with respect to the XZ plane so as to communicate with the mounting hole 25. This allows the screws 22N for fixing the rod-shaped tools 31, 32 to be housed inside the head 20, thereby achieving further miniaturization of the head 20. Furthermore, with this configuration, the screws 22N and the threaded holes 23 can be disposed in positions where they are easily visible, so that the fastening operation of screwing the rod-shaped tools 31, 32 to the head 20 can be performed reliably and easily.

[0034] Additionally, between the right side surface 20F and the bottom surface 20K of the head 20 and between the left side surface 20B and the top surface 20U, thread length adjustment surfaces 20M, which are flat surfaces substantially parallel to the heads of the screws 22N, are formed, and threaded holes 23 are provided therein. This improves the operability of the screws 22N and allows the threaded holes 23 to be drilled obliquely from the side of the mounting hole 25. This has the advantage of making it easier to tighten the screws 22N while ensuring the effective length of the screws 22N for fixing the rod-shaped tools 31 and 32 to the head 20. Furthermore, this configuration reduces the volume of the head 20, thereby enabling further weight reduction of the head 20 and the cutting tool 1.

[0035] The above description of the present embodiment is provided to facilitate understanding of the present disclosure and is not intended to limit the present disclosure. In other words, the present disclosure is not necessarily limited to the specific configurations described above. Design modifications to these specific configurations made by a person skilled in the art are also encompassed within the scope of the present disclosure as long as they comprise the features of the present disclosure. Furthermore, unless otherwise specified, the elements, arrangements, materials, conditions, shapes, dimensions, sizes, scales, etc. of the specific configurations described above are not limited to those exemplified and can be modified as appropriate. Furthermore, the elements of the specific configurations described above can be used in various combinations as long as no technical contradictions arise.

[0036] That is, the shank member 10 is basically cylindrical in shape with flat portions cut out from the cylindrical surface, and in the above embodiment, the right side surface 10F, the left side surface 10B, the top surface 10U, and the bottom surface 10K correspond to these flat portions, but the flat portions may be, for example, only the surfaces on which the screws 12N are provided. Furthermore, the screws 12N, 22N, and 42N do not have to be of the insert type. Furthermore, the head 20 may be fastened to the shank member 10 by simply fitting the protrusion 21 of the head 20 into the recess 11 of the shank member 10 without providing the key 14a and key groove 24a of the shank member 10. [Explanation of symbols]

[0037] 1, 2, 3, 3'... Cutting tool (present disclosure), 8A, 8B... Cutting tool (conventional), 9... Tool rest, 10... Shank member, 10B... Left side surface, 10D... Body portion, 10F... Right side surface, 10K... Lower surface, 10L... Front surface, 10R... Rear surface, 10U... Upper surface, 11... Recess (part of mounting portion), 13... Hole portion, 14... Side wall, 14a... Key, 20... Head, 20B... Left side surface, 20F... Right side surface, 20K... Lower surface, 20L... Front surface, 20M... Thread length adjustment surface, 20R... Rear surface, 20U... Upper surface, 21 ...convex portion (part of head), 21C...fixing direction, 21N...female thread portion, 23...screw hole portion, 24a...key groove, 25...mounting hole portion, 25C...center axis, 30...cutting member, 31, 32...rod-shaped tool (approximately rod-shaped cutting member), 81...cutting member, 82...holding device, 82A...holding device, 82B...head, 91...mounting hole, Wh, Ws...thickness (width), X...front-back direction, X1...front, X2...rear, Y...left-right direction, Y1...right, Y2...left, Z...vertical direction, Z1...upper, Z2...lower

Claims

1. A shank member of a head-exchangeable cutting tool, The cutting tool has an elongated shape and includes a mounting portion on both ends of which a head is mounted, the head having a plurality of mounting holes formed on the same end surface, to which a cutting member having a substantially rod shape is attached. Shank component.

2. A shank member as described in claim 1, wherein the mounting portion has a contact plane against a portion of the head.

3. The shank member according to claim 1 , wherein the mounting portion has a recess into which a portion of the head is inserted.

4. 4. The shank member according to claim 3, further comprising a screw hole portion drilled from a side of said recess so as to communicate with said recess, and into which a screw for fixing said head to said shank member is threadedly engaged.

5. The shank member according to claim 4 , wherein the threaded holes are provided at both ends of the side wall.

6. The shank member according to claim 3 , wherein a central axis of the recess is substantially parallel to a direction in which the head is fixed to the shank member.

7. The head has key grooves on the end face and side face opposite to the same end face, 2. The shank member according to claim 1, wherein the shank member has keys that protrude outward from both end faces and that fit into the key grooves.

8. A head-exchangeable cutting tool, a head having a plurality of mounting holes formed on the same end surface, to which a substantially rod-shaped cutting member is attached; a shank member having an elongated shape and having mounting portions to which the head is attached at both ends; A cutting tool comprising:

9. A cutting tool as described in claim 8, wherein the central axes of the multiple mounting hole portions are approximately parallel to the fixing direction of the head to the shank member.

10. The thickness of the head is equal to the thickness of the shank member, The width of the head is greater than the width of the shank member. The cutting tool according to claim 8.

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