Head of a head-exchangeable cutting tool, and cutting tool

Abstract

This overcomes the constraints imposed by the tool post specifications and increases the types and quantity of cutting members that can be installed on the tool post, thereby enabling multiple types of machining to be performed efficiently on workpieces and improving productivity. [Solution] The head (20) is the head of a head-exchangeable cutting tool (1) and includes an attachment portion (21, 20R) that is attached to a component (10) other than the head (20), and a plurality of mounting hole portions (25, 25) to which cutting members (31, 32) having a generally rod shape are attached.

Description

[Technical Field]

[0001] The present disclosure relates to a head for a head-exchangeable cutting tool and a cutting tool including the head. [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 9(A) and (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 10, 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 head 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 head. [Means for solving the problem]

[0006] [1] An example of a head according to the present disclosure is a head of a head-exchangeable cutting tool, and includes an attachment portion that is attached to a component of the head-exchangeable cutting tool other than the head, and a plurality of mounting holes to which a cutting member having a generally rod shape is attached.

[0007] In this configuration, the head is detachably attached to a component of the head-exchangeable cutting tool. Therefore, after attaching the head to the component previously installed on the tool post, multiple cutting elements can be attached to the head, or the head with multiple cutting elements attached can be attached to the component. Therefore, even if the number of cutting elements 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 in the case of conventional cutting tool 8B (see FIG. 10). 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 elements that can be attached to the tool post, and enable tool exchange without requiring a specific type of tool post. This also enables efficient execution of multiple types of machining on a workpiece.

[0008] [2] The head, excluding the mounting portion, may be substantially rectangular. This allows the entire head to be configured in a shape with a desired aspect ratio, making it easier to reduce the head's thickness so that it is equal to or less than the thickness of the component. This reduces the size and weight of the head, and when a cutting tool with the head mounted on the component is installed on a tool post, interference with another cutting tool placed adjacent to the tool post can be easily avoided.

[0009] [3] Alternatively, the center axis of the mounting hole may be positioned within the thickness or transverse width of the component. In this case, the head structure can be further miniaturized, and interference between the head and the workpiece or with another cutting tool arranged adjacent to the tool post can be further reduced. In this case, the component can also support the cutting force applied to the cutting edge of the cutting member.

[0010] [4] Furthermore, the head may be provided with threaded holes drilled from the sides of the multiple mounting holes so as to communicate with the mounting holes, into which screws for securing the cutting member to the head are threaded. This allows the screws for securing the cutting member to be housed inside the head, thereby achieving further miniaturization of the head. Furthermore, this configuration allows the screws to be positioned in an easily visible position, making it possible to reliably and easily perform the fastening operation of screwing the cutting member to the head. Furthermore, in this case, the effective thread length for tightening the cutting member can be ensured.

[0011] [5] Furthermore, the central axis of the mounting hole may be configured to be approximately parallel to the direction in which the head is fixed to the shank. Such a mounting hole configuration allows for further miniaturization of the head structure and further reduces interference between the head and the workpiece and with another cutting tool placed adjacent to the tool post. Furthermore, by configuring the mounting hole in this manner, a head that is useful for various machining operations using a generally rod-shaped cutting member can be realized.

[0012] [6] More specifically, the head may have a thread length adjustment surface with a threaded hole formed therein. This improves the operability of the screw 22N and allows the threaded hole to be drilled obliquely from the side of the mounting hole toward the mounting hole. This makes it easier to tighten the screw while ensuring the effective length of the screw for fixing the cutting member to the head. Furthermore, this configuration reduces the volume of the head, thereby further reducing the weight of the head and cutting tool.

[0013] [7] Alternatively, the head may have a curved surface with a predetermined curvature so that the center is lowest toward an imaginary plane including the central axes of the mounting holes, and the central axes of the mounting holes may be eccentric from the longitudinal central axis of the component toward the opposite side of the curved surface. In this way, when another cutting tool is placed adjacent to the cutting tool of the present disclosure, the head can be retracted so that the workpiece to be machined, such as a rod-shaped workpiece, faces the curved surface. As a result, the installation density of cutting tools on the tool post can be increased while preventing interference between the cutting tools.

[0014] [8] Meanwhile, unlike the above [4], the central axis of the mounting hole may be configured to be approximately perpendicular to the direction in which the head is fixed to the above-mentioned component. This configuration also allows for further miniaturization of the head structure, and further reduces interference between the head and the workpiece and with another cutting tool arranged adjacent to the tool post. Furthermore, by configuring the mounting hole in this manner, it is possible to realize a head that is useful for various types of machining using a generally rod-shaped cutting member.

[0015] [9] Furthermore, multiple mounting holes may be arranged opposite each other on the head, allowing the cutting members to protrude in opposite directions from the head, thereby increasing the degree of freedom in machining the workpiece.

[0016] [10 and 11] Alternatively, at least one of the multiple mounting holes may be through-hole, or all of the multiple mounting holes may be through-hole. In this case, even if there is only one hole, one cutting member can be attached in either direction. Also, even if there is only one similar hole, two cutting members can be attached from both sides of the hole. Furthermore, by using multiple through-holes, the number of rod-shaped tools that can be attached can be further increased. In addition, if there is a through-hole, it is possible to attach and use a rod-shaped tool with cutting edges on both ends.

[0017]

[12] An example of a cutting tool according to the present disclosure is a head-exchangeable cutting tool, comprising a head according to the present disclosure having a mounting portion, a mounting portion, and a plurality of mounting holes to which a generally rod-shaped cutting member is attached, and a component having an elongated shape and having the head attached to both ends. [Effects of the Invention]

[0018] 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]

[0019] [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) is a perspective view showing a cutting tool 2 according to a second embodiment, and FIG. 10(B) is a perspective view showing a state in which another cutting tool 6 is disposed adjacent to the cutting tool 2. FIG. [Figure 7] 1A to 1D are a right side view, a top view, a left side view, and a front view, respectively, showing the cutting tool 2. [Figure 8] FIG. 10(A) is a perspective view showing a cutting tool 3 according to a third embodiment, and FIG. 10(B) is a perspective view showing a cutting tool 3' according to a fourth embodiment. [Figure 9] 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 10] 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

[0020] 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.

[0021] First Embodiment 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.

[0022] 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.

[0023] As shown in these figures, the cutting tool 1 according to this embodiment includes a shank member 10, two heads 20, and four cutting members 30. The shank member 10 has a body portion 10D extending linearly (in the front-rear direction X), and front and rear surfaces 10L, 10R (end surfaces) thereof are formed with recesses 11 into which the protrusions 21 of the heads 20 are inserted. The shank member 10 corresponds to an example of a "component" in this disclosure, and the body portion 10D functions as a shank (a handle portion of the component). 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 the 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.

[0024] Meanwhile, the head 20 has a protrusion 21 protruding from either the front or rear surface 10L, 10R, having a shape that allows it to be inserted into the recess 11 of the shank member 10. The head 20 is attached to the shank member 10 when 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 10L around the recess 11 (the abutting plane thereon). In this respect, the protrusion 12 of the head 20 corresponds to an example of a part of the "attachment portion" in the present disclosure, and the protrusion 12 and the abutting plane on the rear surface 20R constitute an example of the "attachment portion" of the head 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.

[0025] The head 20 also has two mounting holes 25 on its front surface 20L, into which rod-shaped tools 31, 32 (which correspond to an example of a "substantially rod-shaped cutting member" in the present disclosure) constituting the cutting member 30 are respectively attached. These mounting holes 25 are formed so that their central axes 25C are located within the thickness Ws (width) of the shank member 10 (FIG. 2(B)), 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. 1(B)). Note that in FIGS. 3(A) and 4(A), the fixing direction 21C and the central axes 25C are omitted from illustration due to space limitations.

[0026] 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 (corresponding to an example of a "threaded hole" in the present disclosure) aligned along the axial direction of the mounting hole 25, into which screws 22N for fixing the rod-shaped tools 31 and 32 to the head 20 are fitted. In other words, the threaded holes 23, into which the screws 22N for fixing the rod-shaped tools 31 and 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.

[0027] According to the first embodiment of the present disclosure configured as described above, the head 20 is detachably attached to the shank member 10 to form a head-exchangeable cutting tool 1. 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. Alternatively, the head 20 with the attached cutting member 30 can be attached to the shank member 10. Therefore, even if the number of rod-shaped tools to be attached increases and the shape of the head 20 becomes larger, 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. 10 ), 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 tools 31 and 32 that can be attached to the tool post can be increased. Furthermore, tools can be replaced regardless of the type of tool post. This allows for efficient machining of multiple types of workpieces, thereby improving productivity.

[0028] Furthermore, because the head 20, excluding the protrusion 21, is generally rectangular, the entire head 20 can be configured to have a shape with a desired aspect ratio, as in this embodiment, and can be thinned so that the head thickness Wh (width) is equal to or less than the shank thickness Ws (width). This reduces the size and weight of the head 20, and when a cutting tool 1 with the head 20 attached to 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 steps on both surfaces of the shank member 10 and the head 20 can be eliminated, making it easier to thin 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.

[0029] 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.

[0030] 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, this configuration allows the screws 22N and the threaded holes 23 to be positioned in easily visible positions, making it possible to reliably and easily perform the fastening work of screwing the rod-shaped tools 31, 32 to the head 20. Furthermore, in this case, the effective screw length for fastening the rod-shaped tools 31, 32 can be secured.

[0031] Furthermore, the central axis 25C of the mounting hole 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)), thereby enabling 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. Furthermore, by configuring the mounting hole 25 in this manner, a head 20 that is useful for performing various types of machining using rod-shaped tools 31 and 32 can be realized.

[0032] 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.

[0033] 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 with these recesses 11 and protrusions 12 fitted together, and the rear surface 20R (contact plane on the rear surface) around the protrusion 12 abutting against the front surface 10R (contact plane on the front surface) around the recess 11. This allows the head 20 to be pressed against the contact plane on the shank member 10 and fixed, resulting in a cutting tool 1 with a compact shape and reducing the installation area of ​​the cutting tool on the tool post. Furthermore, by inserting the protrusion 21 of the head 20 into the recess 11 of the shank member 10 and fastening them together with the screw 12N, the head 20 can be firmly held to the shank member 10.

[0034] 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, with this configuration, the screw 12N and the threaded hole 13 can be positioned in an easily visible position, making it possible to reliably and easily perform the fastening operation of screwing the head 20 to the shank member 10.

[0035] 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.

[0036] Second Embodiment Fig. 6(A) is a perspective view showing a cutting tool 2 according to a second embodiment, and Fig. 6(B) is a perspective view showing a state in which another cutting tool 6 is arranged adjacent to the cutting tool 2. Figs. 7(A) to 7(D) are a front view, a top view, a rear view, and a left side view, respectively, showing the cutting tool 2. The coordinate axes shown in Fig. 7 are those relative to Fig. 7(A).

[0037] As shown in these figures, the cutting tool 2 according to this embodiment includes a shank member 40, two heads 50 (one of which is not shown), and a cutting member 30. The shank member 40 is a generally round bar-shaped member that extends linearly (in the front-rear direction X), similar to the shank member 10, except that the threads 22N provided on the side wall 14 are changed to threads 42N provided on the top wall 44. The right side surface 40F, left side surface 40B, and bottom surface 40K of the shank member 40 have the same flat surfaces as the top surface 10U, bottom surface 10K, and left side surface 10B of the shank member 10.

[0038] The head 50 has two mounting holes 55 instead of the two mounting holes 25 on the front surface 50L of the head 20, excluding the protrusion 21. The right side surface 50F is curved, unlike the right side surface 20F of the head 20. The right side surface 50F is concave, with a predetermined curvature that is lowest at the center, toward an imaginary plane including the central axis 55C of the mounting holes 55. Meanwhile, the left side surface 50B of the head 50 is also curved in the same shape as the right side surface 50F, as shown in FIG. 7(D), and is convex toward the left (Y2). The top surface 50U and bottom surface 50K of the head 50 are generally flat. Furthermore, the central axis 55C of the mounting holes 55 is eccentric from the longitudinal central axis 40C of the shank member 40 toward the opposite side (Y2) of the direction in which the curved surface of the right side surface 50F is formed (Y1). The mounting holes 55 are fitted with rod-shaped tools 33 and 34 (corresponding to an example of the "substantially rod-shaped cutting member" in the present disclosure) that constitute the cutting member 30.

[0039] According to the second embodiment of the present disclosure configured as described above, the head 50 is detachably attached to the shank member 40 to form a head-exchangeable cutting tool 2. Therefore, as with the cutting tool 1, even if the rod-shaped tools 33, 34 are attached to the head 50, it is possible to avoid a situation in which they cannot be installed on the tool post 9. As a result, it is possible to overcome the constraints imposed by the specifications of the tool post, increase the number and types of rod-shaped tools 33, 34 that can be installed, and enable tool replacement without having to choose the type of tool post. This allows for efficient execution of multiple types of machining on a workpiece, thereby improving productivity, and other functions equivalent to those of the head 20 and cutting tool 1 of the first embodiment.

[0040] Furthermore, with this configuration, when cutting tool 6 is placed adjacent to cutting tool 2 as shown in FIG. 6(B), the workpiece to be machined, such as a rod-shaped workpiece (not shown), can be positioned between the curved front surface 50F and the cutting member 39 attached to cutting tool 6. This allows head 50 to be retracted so as not to interfere with the workpiece, thereby increasing the installation density of cutting tools on the tool post while preventing interference between cutting tools, thereby further improving the efficiency of machining operations. Furthermore, since threads 42N are provided on the upper wall 44 of shank member 40, attachment and detachment of head 20 is easy even in the state shown in FIG. 6(B).

[0041] Third and Fourth Embodiments Fig. 8(A) is a perspective view showing a cutting tool 3 according to a third embodiment, and Fig. 8(B) is a perspective view showing a cutting tool 3' according to a fourth embodiment. The cutting tool 3 shown in Fig. 8(A) includes a cutting member 30 composed of a shank member 60, a head 70, and rod-shaped tools 35 and 36. The cutting tool 3' shown in Fig. 8(B) includes a cutting member 30 composed of a shank member 60, a head 70', and rod-shaped tools 37 and 38. The shank member 60 common to these tools, although some parts are not shown, is a square rod-shaped member that has a step portion 60S and extends in the vertical direction Z, and is held by, for example, multiple comb-shaped pedestals provided on a tool post.

[0042] A protrusion 61 is provided on the lower Z2 side (lower surface) of the step portion 60S, and a mounting hole portion (not shown) is drilled therein, into which a protrusion portion (not shown) of the head 70, 70' (which corresponds to an example of part of the "mounting portion" in this disclosure) is inserted. Further, a screw hole portion 63 is drilled in the front surface 60L of the step portion 60S, which communicates with the mounting hole portion and into which a screw (not shown) is fitted to fix the head 70, 70' to the shank member 60.

[0043] On the other hand, the heads 70, 70' are generally rectangular parallelepiped-shaped except for the protrusions (not shown), and a recess 71 that fits with the protrusion 61 of the shank member 60 is formed on the top surface 70U. A protrusion (not shown) that fits into the mounting hole of the shank member 60 is also formed on the top surface 70U and protrudes upward Z1. Furthermore, a mounting hole 75 for mounting the rod-shaped tools 35, 36 is formed in the rear surface 70R of the head 70 (FIG. 8(A)). On the other hand, a mounting hole 75 for mounting the rod-shaped tool 37 is formed in the rear surface 70R of the head 70', and a mounting hole 75 for mounting the rod-shaped tool 38 is formed in the front surface 70L.

[0044] The mounting hole portion 75 is provided so that its central axis 75C is approximately perpendicular (orthogonal) to the fixing direction 60C (vertical direction XZ) of the heads 70, 70′ to the shank member 60. As shown in the figure, the mounting hole portions 75 are provided so that their central axes 75C are located within the thickness Ws (width) of the shank member 60. Furthermore, a threaded hole portion 73 is drilled from the side of the mounting hole portion 75 on the right side surface 70F of the head 70, and the threaded hole portion 73 communicates with the mounting hole portion 75 and receives a screw (not shown) for fixing the rod-shaped tool 35 to the head 70 ( FIG. 8(A) ). A threaded hole portion is drilled on the left side surface opposite the right side surface 70F, and receives a screw for fixing the cutting member 36 to the head 70 ( FIG. 8(A) ). On the other hand, a threaded hole portion is drilled in the left side surface of the head 70′ opposite the right side surface 70F, the threaded hole portion communicating with the mounting hole portion 75 and receiving a screw for fixing the rod-shaped tools 37, 38 to the head 70′ (FIG. 8(B)).

[0045] According to the third and fourth embodiments of the present disclosure configured as described above, the head 70, 70′ is detachably attached to the shank member 60 to form the head-exchangeable cutting tool 3, 3′. Therefore, similar to the cutting tools 1, 2, multiple rod-shaped tools 35, 36 and rod-shaped tools 37, 38 can be mounted with the shank member 60 held in the tool post. This overcomes the constraints imposed by the tool post specifications, increases the number and types of rod-shaped tools 35, 36, 37, 38 that can be mounted on the tool post, and enables tool exchange without requiring a specific tool post. As a result, multiple types of machining can be efficiently performed on a workpiece, improving productivity, and other functions equivalent to those of the head 20 and cutting tool 1 of the first embodiment and the head 50 and cutting tool 2 of the second embodiment can be realized.

[0046] Furthermore, with this configuration, the center axis 75C of the mounting hole 75 is positioned approximately perpendicular to the fixing direction 60C (vertical direction Z) of the head 70, 70' to the shank member 60, thereby enabling further miniaturization of the head 70, 70'. This further reduces interference between the head 70, 70' 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. Furthermore, by configuring the mounting hole 75 in this manner, a head useful for performing various machining operations using rod-shaped tools 35, 36, 37, 38 can be realized.

[0047] Furthermore, multiple mounting holes 75 may be arranged opposite each other on the heads 70, 70'. This allows the cutting members to protrude in opposite directions on the head, thereby increasing the degree of freedom in machining the workpiece and improving flexibility.

[0048] Furthermore, at least one of the multiple mounting holes 75 may be a through hole in the head 70, 70', or all of the multiple mounting holes 75 may be through holes. In this case, even if there is only one hole, one rod-shaped tool can be attached in either direction. Similarly, even if there is only one hole, two rod-shaped tools can be attached from both sides of the hole. Furthermore, multiple through holes can be used to further increase the number of rod-shaped tools that can be attached. Furthermore, if there is a through hole, it is possible to attach and use a rod-shaped tool that has cutting edges on both ends.

[0049] In addition, threaded holes 73, into which screws for fixing the rod-shaped tools 35, 36, 37, and 38 to the heads 70, 70' are threaded, are drilled from the side of the mounting hole 75 at a predetermined angle with respect to the XZ plane so as to communicate with the mounting hole 75. This allows the screws for fixing the rod-shaped tools 35, 36, 37, and 38 to be housed inside the heads 70, 70', thereby achieving further miniaturization of the heads 70, 70'. Furthermore, this configuration allows the screws and threaded holes 73 to be positioned so that they are easily visible from the front and rear, thereby ensuring a reliable and easy fastening operation for fixing the rod-shaped tools 35, 36, 37, and 38 to the heads 70, 70'. Furthermore, in this case, the effective screw length for fastening the rod-shaped tools 35, 36, 37, and 38 can be secured.

[0050] 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.

[0051] That is, for example, three or more cutting members and mounting holes 25, 55, 75 may be provided for each head 20, 50, 70, 70'. Also, the screws 12N, 22N, 42N do not have to be of the screw-and-socket 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. Similarly, the head 70, 70' may be fastened to the shank member 60 by simply fitting the protrusion of the head 70, 70' into the mounting hole of the shank member 60, without providing the protrusion 61 of the shank member 60 and the recess 71 of the head 70, 70'. Also, only one head 20, 50 may be attached to the shank member 10. Furthermore, the central axes 25C of some, but not all, of the mounting hole portions 25 may be located within the thickness Ws (width) of the shank member 10. [Explanation of symbols]

[0052] 1, 2, 3, 3'...Cutting tool (present disclosure), 6...Cutting tool, 8A, 8B...Cutting tool (conventional), 9...Tool rest, 10...Shank member (component), 10B...Left side, 10D...Body, 10F...Right side, 10K...Lower surface, 10L...Front surface, 10R...Rear surface, 10U...Upper surface, 11...Recess, 13...Hole, 14...Side wall, 14a...Key, 20...Head, 20B...Left side, 20F...Right side, 20K ...lower surface, 20L...front surface, 20M...thread length adjustment surface, 20R...rear surface (part of mounting portion), 20U...upper surface, 21...protrusion (part of mounting portion), 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, 33, 34, 35, 36, 37, 38...rod-shaped tool (approximately rod-shaped cutting member), 39...cutting member, 4 0...shank member, 40B...left side face, 40C...center axis, 40F...right side face, 40K...bottom face, 40U...top face, 44...upper wall, 50...head, 50B...left side face, 50F...right side face, 50K...bottom face, 50L...front face, 50U...top face, 55...mounting hole portion, 55C...center axis, 60...shank member, 60C...fixing direction, 60L...front face, 60S...step portion, 61...convex portion, 63...screw hole portion, 70, 70'...head, 70F...right side, 70L...front, 70R...rear, 70U...top, 71...recess, 73...screw hole, 75...mounting hole, 75C...center axis, 81...cutting member, 82A...holding fixture, 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 head of a head-exchangeable cutting tool, the cutting tool is attached to a tool rest and does not rotate, and processes a workpiece by rotating the workpiece; The head is a mounting portion that is mounted on a component other than the head of the head-exchangeable cutting tool; a plurality of mounting holes formed on the same end surface and into which a substantially rod-shaped cutting member is attached; Equipped with The central axis of the mounting hole is disposed within the thickness or width in the short side direction of the component. head.

2. 2. The head according to claim 1, wherein the portion excluding the mounting portion is substantially rectangular parallelepiped.

3. the thickness of the head is equal to the thickness of the component; the width of the head is greater than the width of the component; The head according to claim 1.

4. 2. The head according to claim 1, further comprising a threaded hole formed from a side of the plurality of mounting holes so as to communicate with the plurality of mounting holes, the threaded hole receiving a screw for fixing the cutting member to the head.

5. The head according to claim 1 , wherein the central axis of the mounting hole is substantially parallel to a direction in which the head is fixed to the component.

6. A head of a head-exchangeable cutting tool, a mounting portion that is mounted on a component other than the head of the head-exchangeable cutting tool; a plurality of mounting holes formed on the same end surface and into which a substantially rod-shaped cutting member is attached; a threaded hole portion drilled from a side of the plurality of mounting hole portions so as to communicate with the plurality of mounting hole portions, and into which a screw for fixing the cutting member to the head is threadedly engaged; Equipped with The central axis of the mounting hole is disposed within the thickness or width in the short-side direction of the component, a thread length adjustment surface on which the threaded hole portion is drilled, the screw length adjustment surface is a plane substantially parallel to the head of the screw, The screw hole portion has a predetermined angle with respect to a side surface of the head. head.

7. A head of a head-exchangeable cutting tool, a mounting portion that is mounted on a component other than the head of the head-exchangeable cutting tool; a plurality of mounting holes to which a substantially rod-shaped cutting member is attached; Equipped with a central axis of the mounting hole portion is substantially parallel to a direction in which the head is fixed to the component; a curved surface having a predetermined curvature that is lowest at the center toward an imaginary plane including the central axes of the plurality of mounting hole portions; The central axes of the plurality of mounting holes are eccentric from the central axis of the component in the longitudinal direction toward the opposite side to the direction in which the curved surface is formed. head.

8. A head of a head-exchangeable cutting tool, a mounting portion that is mounted on a component other than the head of the head-exchangeable cutting tool; a plurality of mounting holes formed on the same end surface and into which a substantially rod-shaped cutting member is attached; Equipped with The central axis of the mounting hole is disposed within the thickness or width in the short-side direction of the component, The central axis of the mounting hole is approximately perpendicular to the direction in which the head is fixed to the component. head.

9. The head of claim 8 , wherein the plurality of mounting holes includes mounting holes arranged oppositely in the head.

10. The head of claim 8 , wherein at least one of the plurality of mounting holes is through.

11. The head of claim 8 , wherein all of the plurality of mounting holes are through holes.

12. A head of a head-exchangeable cutting tool, a mounting portion that is mounted on a component other than the head of the head-exchangeable cutting tool; a plurality of mounting holes formed on the same end surface and into which a substantially rod-shaped cutting member is attached; Equipped with The component has keys protruding outward from both end faces, The head has a key groove that fits into the key on an end face and a side face opposite to the same end face. head.

13. A head-exchangeable cutting tool, a head having a mounting portion and a plurality of mounting holes formed on the same end surface and into which a substantially rod-shaped cutting member is attached; a component having an elongated shape and having the heads attached to both ends; Equipped with The central axis of the mounting hole is disposed within the thickness or width in the short side direction of the component. cutting tools.

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