Tool holders and machine tools

Abstract

The present invention provides a tool holder that allows multiple tools to be mounted on the tool holder, with the cutting edges of the tools spaced sufficiently apart, and a machine tool equipped with such a tool holder. [Solution] The tool holder (10A) comprises a first surface (211) attached to the tool post, a second surface (212) facing the first surface (211), a first tool placement area (221) on which the first tool (T1) is placed, and a second tool placement area (222) located away from the first tool placement area (221) in a first direction (201) on which the second tool (T2) is placed. When viewed along the second direction (202) perpendicular to the first surface (211), the length of the second surface (212) in the first direction (201) is longer than the length of the first surface (211).

Description

Technical Field

[0001] This invention relates to a tool holder and a machine tool.

Background Art

[0002] For example, Japanese Patent Application Laid-Open No. 2007-75922 (Patent Document 1) discloses a machine tool provided with a turret tool rest. Two turning tools are mounted on the tool mounting station of the turret tool rest at intervals in the circumferential direction of the turret.

[0003] In addition, Japanese Patent Application Laid-Open No. 2013-184275 (Patent Document 2) and Japanese Patent Application Laid-Open No. 2016-104513 (Patent Document 3) also disclose various tool rests to which tools can be additionally mounted.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0005] As disclosed in the above Patent Documents 1 to 3, a turret-type tool rest for holding tools in a machine tool is known. The turret-type tool rest has a swivel part on which a plurality of tool holders are mounted side by side in the circumferential direction, and by swiveling the swivel part, a desired tool is indexed to the machining position.

[0006] In such a turret-type tool post, configuring each tool holder to accommodate multiple tools reduces the effort required for tool changes on the tool post while enabling the processing of a wide variety of workpieces. However, because the space available for each tool holder on the tool post is limited, it may not be possible to position the cutting edges of multiple tools mounted on the tool holders with sufficient spacing between them. In this case, the processing conditions for the workpiece are severely restricted in order to avoid interference between the workpiece and the tools used for processing, as well as adjacent tools.

[0007] The object of this invention is to provide a tool holder that allows the cutting edges of multiple tools to be positioned at sufficient intervals from each other when multiple tools are attached to the tool holder, and a machine tool equipped with such a tool holder. [Means for solving the problem]

[0008] The tool holder according to this invention is a tool holder that is mounted on a turret-type tool post and is used to hold tools. The tool holder comprises a first surface attached to the tool post, a second surface facing the first surface, a first tool placement area where a first tool is placed, and a second tool placement area located away from the first tool placement area in a first direction and where a second tool is placed. When viewed along the second direction perpendicular to the first surface, the length of the second surface in the first direction is longer than the length of the first surface.

[0009] A machine tool according to this invention comprises a tool post having a swivel section capable of rotational movement, and the above-mentioned tool holder attached to the swivel section. The first direction corresponds to the tangential direction of the circumference of the swivel section centered on the pivot axis. The tool post is indexable to a plurality of angular positions in the circumferential direction around the pivot axis, including a first angular position for positioning a first tool at a predetermined workpiece machining position and a second angular position for positioning a second tool at a predetermined workpiece machining position. [Effects of the Invention]

[0010] According to this invention, when multiple tools are attached to the tool holder, it is possible to provide a tool holder that allows the cutting edges of multiple tools to be positioned at a sufficient distance from each other, and a machine tool equipped with such a tool holder. [Brief explanation of the drawing]

[0011] [Figure 1] This is a front view of a machine tool. [Figure 2] This figure shows the tool post as viewed in the direction indicated by arrow II in Figure 1. [Figure 3] This diagram shows the tool post when the first tool is indexed to the workpiece machining position. [Figure 4] This diagram shows the tool post when the second tool is indexed to the workpiece machining position. [Figure 5] This is a perspective view showing a tool holder for external diameter machining. [Figure 6] This is a perspective view showing the blocks that make up a tool holder for external diameter machining. [Figure 7] This is a side view of the block as seen in the direction indicated by arrow VII in Figure 6. [Figure 8] This is a side view of the block as seen in the direction indicated by arrow VIII in Figure 6. [Figure 9] This is a top view showing the block as seen in the direction indicated by arrow IX in Figure 6. [Figure 10] Figure 6 is a side view showing the block as seen in the direction indicated by arrow X. [Figure 11] A cross-sectional view of the tool holder as seen in the direction of the arrow along the line XI-XI in Figure 5. [Figure 12] This is a cross-sectional view of the tool holder as seen in the direction of the arrow along the line XII-XII in Figure 5. [Figure 13] Figure 6 is a perspective view showing the internal structure of the block. [Figure 14] This is a perspective view showing a tool holder for internal diameter machining. [Figure 15] Another perspective view showing a tool holder for internal diameter machining. [Figure 16]It is a perspective view showing a block constituting a tool holder for inner diameter machining. [Figure 17] It is a side view showing the block as viewed in the direction indicated by arrow XVII in Fig. 16. [Figure 18] It is a side view showing the block as viewed in the direction indicated by arrow XVIII in Fig. 16. [Figure 19] It is a top view showing the block as viewed in the direction indicated by arrow XIX in Fig. 16. [Figure 20] It is a perspective view showing the internal structure of the block in Fig. 16.

Embodiments for Carrying Out the Invention

[0012] Embodiments of this invention will be described with reference to the drawings. In the drawings referred to below, the same or corresponding members are given the same numbers.

[0013] Fig. 1 is a front view showing a machine tool. In Fig. 1, the inside of the machine tool is shown by seeing through the cover body forming the appearance of the machine tool. Fig. 2 is a view showing the tool rest as viewed in the direction indicated by arrow II in Fig. 1.

[0014] Referring to Figs. 1 and 2, the machine tool 100 is a composite machining machine equipped with both a milling function for performing workpiece machining by bringing a rotating tool into contact with a stationary workpiece and a turning function for performing workpiece machining by bringing a tool into contact with a rotating workpiece.

[0015] The machine tool 100 is an NC (Numerically Controlled) machine tool in which various operations for workpiece machining are automated by numerical control by a computer.

[0016] In this specification, for the convenience of explaining the configuration of the machine tool 100, the axis parallel to the rotation axis of the workpiece and extending horizontally is called the "Z-axis," the axis perpendicular to the Z-axis and extending horizontally is called the "Y-axis," and the axis extending vertically is called the "X-axis." In Figure 1, the rightward direction is called the "+Z-axis direction," and the leftward direction is called the "-Z-axis direction." In Figure 1, the direction towards the viewer is called the "+Y-axis direction," and the direction towards the back of the paper is called the "-Y-axis direction." The upward direction is called the "+X-axis direction," and the downward direction is called the "-X-axis direction."

[0017] The machine tool 100 includes a bed 16, a first workpiece spindle 21, a second workpiece spindle 26, a tool spindle 41, and a tool post 30. The first workpiece spindle 21, the second workpiece spindle 26, the tool spindle 41, and the tool post 30 are arranged in the machining area 160. The machining area 160 is the space where workpieces are machined, and is sealed by a cover (not shown) to prevent foreign matter such as chips or cutting oil from leaking outside the machining area 160.

[0018] The bed 16 is a base member for supporting the first work spindle 21, the second work spindle 26, the tool spindle 41, and the tool post 30, etc., and is installed on the floor of a factory or similar facility. The bed 16 is made of metal such as cast iron.

[0019] The first work spindle 21 and the second work spindle 26 are capable of holding workpieces (in Figure 1, a workpiece W held by the first work spindle 21 is shown). The first work spindle 21 is driven by a motor to rotate around a rotational center axis 110 parallel to the Z-axis. The first work spindle 21 is provided with a chuck 22 that operates hydraulically or the like to detachably hold a workpiece.

[0020] The second work spindle 26 is positioned opposite the first work spindle 21 in the Z-axis direction. The second work spindle 26 is driven by a motor to rotate around a rotational axis 120 that is parallel to the Z-axis and extends in a straight line with the rotational axis 110. The second work spindle 26 is provided with a chuck 27 that is operated by hydraulics or the like to hold a workpiece in a detachable manner.

[0021] Each of the first work spindle 21 and the second work spindle 26 can be rotated in both forward and reverse directions. When viewing each work spindle from the rear side opposite to the tool post 30, clockwise rotation around the rotation axis 110 and rotation axis 120 corresponds to the forward direction, and counterclockwise rotation corresponds to the reverse direction. For the first work spindle 21, the direction indicated by arrow S1 in Figure 1 corresponds to the forward direction, and the direction indicated by arrow S2 in Figure 1 corresponds to the reverse direction. For the second work spindle 26, the direction indicated by arrow S3 in Figure 1 corresponds to the forward direction, and the direction indicated by arrow S4 in Figure 1 corresponds to the reverse direction.

[0022] The first workpiece spindle 21 is fixed to the bed 16. The second workpiece spindle 26 is movable in the Z-axis direction by various feed mechanisms, guide mechanisms and motors.

[0023] The tool spindle 41 is capable of holding a tool. The tool spindle 41 is driven by a motor to rotate around a rotational axis 140 parallel to the X-axis in a reference position described later. The tool spindle 41 has a built-in clamping mechanism (not shown) for detachably holding a tool.

[0024] The tool spindle 41 is also capable of rotation around a pivot axis 130 parallel to the Y-axis (B-axis rotation). The pivot axis 130 intersects with the rotation axis 140. The rotation range of the tool spindle 41 is, for example, ±120° with respect to a reference position (the position of the tool spindle 41 shown in Figure 1) where the spindle end face 42 of the tool spindle 41 faces in the -X-axis direction (downward).

[0025] The tool spindle 41 is movable in the X, Y, and Z directions by various feed mechanisms, guide mechanisms, and motors. Although not shown in Figure 1, an automatic tool changer (ATC) for automatically changing the tool held on the tool spindle 41 and a tool magazine for storing replacement tools are provided around the first work spindle 21.

[0026] The tool post 30 can hold multiple tools T via multiple tool holders 10, which will be described later. The tool post 30 is a turret-type tool post that moves multiple tools T in the circumferential direction around the pivot axis 150 to position the tools T used for machining at a predetermined workpiece machining position Wp. The pivot axis 150 extends parallel to the rotation axis of the workpiece in the machine tool 100.

[0027] The tool post 30 includes a turret 31 and a tool post base 32. The turret 31 is mounted on the tool post base 32. The turret 31 protrudes from the tool post base 32 in the axial direction of the pivot axis 150. The turret 31 protrudes from the tool post base 32 in the axial direction of the pivot axis 150 toward the first work spindle 21. The turret 31 may also protrude from the tool post base 32 in the axial direction of the pivot axis 150 toward the second work spindle 26. The turret 31 is supported by the tool post base 32 so as to be rotatable about the pivot axis 150. The turret 31 rotates about the pivot axis 150 by receiving rotation from a motor (not shown) mounted on the tool post base 32.

[0028] The swivel section 31 has multiple mounting surfaces 36. A tool holder 10, which will be described later, can be attached to each mounting surface 36.

[0029] The mounting surface 36 consists of a plane perpendicular to a virtual straight line perpendicular to the pivot axis 150. Multiple mounting surfaces 36 are arranged in the circumferential direction centered on the pivot axis 150. The swivel section 31 has thickness (height) in the axial direction of the pivot axis 150 and consists of a rectangular prism having a regular polygonal shape corresponding to the number of mounting surfaces 36 when viewed along the axial direction of the pivot axis 150. The swivel section 31 is provided with a groove 33 that opens to the mounting surface 36 and extends in a direction perpendicular to the pivot axis 150. When a long outer diameter machining tool is held in the tool holder 10 (described later), the shank portion of the tool is positioned in the groove 33.

[0030] The tool post 30 is located between the first work spindle 21 and the second work spindle 26 in the Z-axis direction. The tool post 30 is located below both the rotational axis 110 and the rotational axis 120. The pivot axis 150, when viewed along the Z-axis direction, is located on a virtual straight line that passes through the rotational axis 110 and the rotational axis 120 and extends in the X-axis direction (vertical direction). The tool post 30 is movable in the X-axis and Z-axis directions by various feed mechanisms, guide mechanisms, and motors. The tool post 30 is immovable in the Y-axis direction.

[0031] The machine tool 100 further has a plurality of tool holders 10. The tool holders 10 are capable of holding tools T. As an example, the swivel unit 31 has 10 mounting surfaces 36. As shown in Figure 2, the swivel unit 31 is marked with numbers 1 to 10, and these numbers represent the station numbers of the mounting surfaces 36.

[0032] Multiple tool holders 10 are each attached to multiple mounting surfaces 36. In Figure 2, tool holders 10 are attached to all of the multiple mounting surfaces 36, but tool holders 10 may be attached to only some of the multiple mounting surfaces 36. To prevent foreign matter such as chips or coolant from entering the inside of the swivel section 31, covers may be attached to the mounting surfaces 36 to which tool holders 10 are not attached, using bolts or the like.

[0033] Figure 3 shows the tool post when the first tool is indexed to the workpiece machining position. Figure 4 shows the tool post when the second tool is indexed to the workpiece machining position.

[0034] Referring to Figures 1 to 4, the multiple tool holders 10 include tool holders 10A and tool holders 10B. Tool holder 10A is capable of holding a cutting tool for external diameter machining as tool T. Tool holder 10B is capable of holding a cutting tool for internal diameter machining as tool T. The combination of the number of tool holders 10A and tool holders 10B mounted on the tool post 30 is not particularly limited.

[0035] Each tool holder 10 is capable of holding multiple tools T. The tool holder 10 is capable of holding a first tool T1 and a second tool T2 as tools T. The first tool T1 and the second tool T2 are spaced apart from each other in the circumferential direction about the pivot axis 150. Between adjacent tool holders 10 in the circumferential direction about the pivot axis 150, the first tool T1 and the second tool T2 are arranged adjacent to each other.

[0036] For example, the first tool T1 held in the tool holder 10 of station number 1 and the second tool T2 held in the tool holder 10 of station number 10 are arranged adjacent to each other in the circumferential direction of the pivot axis 150. The first tool T1 held in the tool holder 10 of station number 1 is positioned between the second tool T2 held in the tool holder 10 of station number 1 and the second tool T2 held in the tool holder 10 of station number 10 in the circumferential direction of the pivot axis 150.

[0037] Typically, Figure 3 shows the case where the first tool T1, held in the tool holder 10 of station number 1, is positioned at the workpiece machining position Wp, and Figure 4 shows the case where the second tool T2, held in the tool holder 10 of station number 1, is positioned at the workpiece machining position Wp. The workpiece machining position Wp is the position where the tool T used for machining the workpiece is positioned. In the X-axis direction, the workpiece machining position Wp is located between the rotational axis 110 and rotational axis 120 and the swivel axis 150. The tool T positioned at the workpiece machining position Wp is positioned directly below the workpiece held by the first workpiece spindle 21 or the second workpiece spindle 26.

[0038] The tool post 30 allows the swivel section 31 to be indexed to multiple angular positions P01, P11, P02, P12, P03, P13, P04, P14, P05, P15, P06, P16, P07, P17, P08, P18, P09, P19, P10, and P20 in the circumferential direction around the swivel axis 150. The multiple angular positions P01, P11, P02, P12, P03, P13, P04, P14, P05, P15, P06, P16, P07, P17, P08, P18, P09, P19, P10, and P20 are arranged in the order listed above at equal intervals (18° each) in the circumferential direction around the swivel axis 150.

[0039] Angular positions P01, P02, P03, P04, P05, P06, P07, P08, P09, and P10 correspond to the regular indexing positions of station numbers 1 to 10, respectively. For example, when the swivel unit 31 is indexed to angular position P01 shown in Figure 3, the first tool T1 held in the tool holder 10 of station number 1 is positioned at workpiece machining position Wp. When the swivel unit 31 is indexed to angular position P02, the first tool T1 held in the tool holder 10 of station number 2 is positioned at workpiece machining position Wp. When the swivel section 31 is positioned at angular position P01, a virtual straight line connecting the rotational axis 110 and rotational axis 120 with the swivel axis 150, extending in the X-axis direction, is perpendicular to the mounting surface 36 at station number 1. When the swivel section 31 is positioned at angular position P02, a virtual straight line connecting the rotational axis 110 and rotational axis 120 with the swivel axis 150, extending in the X-axis direction, is perpendicular to the mounting surface 36 at station number 2.

[0040] Angular positions P11, P12, P13, P14, P15, P16, P17, P18, P19, and P20 each correspond to intermediate indexing positions between adjacent stations in the circumferential direction around the pivot axis 150. For example, when the pivot unit 31 is indexed to angular position P11 shown in Figure 4, the second tool T2 held in the tool holder 10 of station number 1 is indexed to workpiece machining position Wp, and when the pivot unit 31 is indexed to angular position P12, the second tool T2 held in the tool holder 10 of station number 2 is indexed to workpiece machining position Wp.

[0041] The NC program for operating the machine tool 100 includes a command code that positions the swivel unit 31 at a predetermined angular position. The command code consists of a number representing the angular position and a number that identifies tool compensation. As an example, the instruction codes for positioning the swivel section 31 at angular positions P01, P11, P02, P12, P03, P13, P04, P14, P05, P15, P06, P16, P07, P17, P08, P18, P09, P19, P10, and P20 are T0101, T1111, T0202, T1212, T0303, T1313, T0404, T1414, T0505, T1515, T0606, T1616, T0707, T1717, T0808, T1818, T0909, T1919, T1010, and T2020, respectively.

[0042] Figure 5 is a perspective view showing a tool holder for outer diameter machining. Referring to Figure 5, the tool T has a shank 51 and a tip 52. The shank 51 is the part held by the tool holder 10. The shank 51 consists of a rod member extending in one direction. The tip 52 is the part that constitutes the cutting edge for machining the workpiece. The tip 52 is attached to the shank 51. The tip 52 is attached to the end of the rod-shaped shank 51 that extends in one direction.

[0043] Referring to Figures 1 and 5, the first tool T1 and the second tool T2 are positioned opposite the first workpiece spindle 21 in the axial direction of the pivot axis 150. The first tool T1 and the second tool T2 are used for machining a workpiece held on the first workpiece spindle 21. In each tool T of the first tool T1 and the second tool T2, positioned at the workpiece machining position Wp, the tip 52 is positioned to face the +Y axis. The first tool T1 and the second tool T2 are used for machining a workpiece when the first workpiece spindle 21 is rotated in the forward direction (the direction indicated by arrow S1 in Figure 1).

[0044] The tool holder 10 is capable of holding a third tool T3 and a fourth tool T4 as tools T. The third tool T3 and the fourth tool T4 are spaced apart from each other in the circumferential direction around the pivot axis 150. Between adjacent tool holders 10 in the circumferential direction around the pivot axis 150, the third tool T3 and the fourth tool T4 are positioned adjacent to each other.

[0045] The third tool T3 is positioned symmetrically with respect to the first tool T1, with a virtual plane perpendicular to the pivot axis 150 in between. The fourth tool T4 is positioned symmetrically with respect to the second tool T2, with a virtual plane perpendicular to the pivot axis 150 in between.

[0046] The third tool T3 and the fourth tool T4 are positioned opposite the second workpiece spindle 26 in the axial direction of the pivot center axis 150. The third tool T3 and the fourth tool T4 are used for machining workpieces held by the second workpiece spindle 26. In each tool T of the third tool T3 and the fourth tool T4, positioned at the workpiece machining position Wp, the tip 52 is positioned to face the +Y axis. The third tool T3 and the fourth tool T4 are used for machining workpieces when the second workpiece spindle 26 is rotated in the reverse direction (indicated by arrow S4 in Figure 1).

[0047] Next, the more specific structure of the tool holder 10A for outer diameter machining will be described. Figure 6 is a perspective view showing the blocks that make up the tool holder for outer diameter machining. Figure 7 is a side view showing the blocks as seen in the direction indicated by arrow VII in Figure 6. Figure 8 is a side view showing the blocks as seen in the direction indicated by arrow VIII in Figure 6. Figure 9 is a top view showing the blocks as seen in the direction indicated by arrow IX in Figure 6. Figure 10 is a side view showing the blocks as seen in the direction indicated by arrow X in Figure 6.

[0048] In Figures 5 to 10, and later in Figures 13 to 20, the first direction 201, the second direction 202, the third direction 203, and the fourth direction 204 are indicated by arrows. When the tool holder 10 is attached to the tool post 30 (swivel section 31), the first direction 201 corresponds to the tangential direction of the circumference centered on the swivel axis 150, the second direction 202 corresponds to the direction perpendicular to the swivel axis 150, and the fourth direction 204 corresponds to the axial direction (Z-axis direction) of the swivel axis 150.

[0049] Referring to Figures 5 to 10, the tool holder 10A has a block 210. The block 210 is made of metal. The block 210 has a first face 211, a second face 212, a third face 213, a fourth face 214, a fifth face 215, and a sixth face 216. Overall, the block 210 is a hexahedron having the first face 211, the second face 212, the third face 213, the fourth face 214, the fifth face 215, and the sixth face 216.

[0050] The first surface 211 is one of several sides of the tool holder 10A that is attached to the tool post 30. When the tool holder 10A is attached to the tool post 30, the first surface 211 is in surface contact with the mounting surface 36.

[0051] The first surface 211 consists of a plane that includes a first direction 201 and a fourth direction 204. The first surface 211 is parallel to the first direction 201. The second direction 202 is perpendicular to the first surface 211. The first surface 211 as a whole has a rectangular shape with a pair of edges extending in the first direction 201 and facing each other in the fourth direction 204, and a pair of edges extending in the fourth direction 204 and facing each other in the first direction 201.

[0052] The second surface 212 is opposite the first surface 211. The second surface 212 is positioned on the opposite side of the first surface 211, with a gap in the second direction 202. The second surface 212 consists of a plane that includes the first direction 201 and the fourth direction 204. When viewed along the fourth direction 204, the second surface 212 has a rectangular shape as a whole, having a pair of edges that extend in the first direction 201 and are opposite to each other in the fourth direction 204, and a pair of edges that extend in the fourth direction 204 and are opposite to each other in the first direction 201.

[0053] The second surface 212 has a larger area than the first surface 211. When the block 210 (tool holder 10A) is viewed along the second direction 202 perpendicular to the first surface 211, the length L2 of the second surface 212 in the first direction 201 is longer than the length L1 of the first surface 211 in the first direction 201 (L2 > L1). The width of the block 210 in the first direction 201 increases in the second direction 202 as it moves from the first surface 211 towards the second surface 212.

[0054] The third surface 213 and the fourth surface 214 are opposite each other. The fourth surface 214 is positioned on the opposite side of the third surface 213, spaced apart in the fourth direction 204. The third surface 213 consists of a plane including the first direction 201 and the second direction 202. The third surface 213 extends between the first surface 211 and the second surface 212 in the second direction 202, and between the fifth surface 215 and the sixth surface 216 in the first direction 201. The fourth surface 214 consists of a plane including the first direction 201 and the second direction 202. The fourth surface 214 extends between the first surface 211 and the second surface 212 in the second direction 202, and between the fifth surface 215 and the sixth surface 216 in the first direction 201. The third surface 213 and the fourth surface 214 have a symmetrical shape across a virtual plane that includes the first direction 201 and the second direction 202.

[0055] With the tool holder 10A attached to the tool post 30, the third surface 213 faces the first work spindle 21 in the axial direction of the pivot axis 150, and the fourth surface 214 faces the second work spindle 26 in the axial direction of the pivot axis 150.

[0056] The fifth face 215 and the sixth face 216 are opposite each other. The sixth face 216 is positioned on the opposite side of the fifth face 215, spaced apart in the first direction 201. The fifth face 215 consists of a plane that includes the second direction 202 and the fourth direction 204. In the second direction 202, the fifth face 215 extends between the first face 211 and the second face 212, and in the fourth direction 204, it extends between the third face 213 and the fourth face 214. The fifth face 215 consists of a plane perpendicular to the first face 211. The sixth face 216 consists of a plane parallel to the fourth direction 204 and oblique to the second direction 202. In the second direction 202, the sixth face 216 extends between the first face 211 and the second face 212, and in the fourth direction 204, it extends between the third face 213 and the fourth face 214. The sixth face 216 consists of a plane that intersects the first face 211 at an oblique angle. The sixth face 216 has a larger area than the fifth face 215.

[0057] When the tool holder 10 is attached to the tool post 30, the third surface 213 and the fourth surface 214 face each other between adjacent tool holders 10 in the circumferential direction around the pivot axis 150.

[0058] Block 210 is provided with a first tool placement section 221 and a second tool placement section 222. A first tool T1 is placed in the first tool placement section 221. A second tool T2 is placed in the second tool placement section 222. The first tool T1 and the second tool T2 are cutting tools for outer diameter machining. The second tool placement section 222 is located away from the first tool placement section 221 in the first direction 201. The first tool placement section 221 and the second tool placement section 222 are spaced apart from each other in the first direction 201.

[0059] The first tool placement section 221 is located between the fifth surface 215 and the second tool placement section 222 in the first direction 201. The second tool placement section 222 is located between the first tool placement section 221 and the sixth surface 216 in the first direction 201. The first tool placement section 221 is located closer to the fifth surface 215 than to the sixth surface 216 in the first direction 201. The second tool placement section 222 is located closer to the sixth surface 216 than to the fifth surface 215 in the first direction 201.

[0060] The first tool placement section 221 has a groove shape that extends in the second direction 202 between the first surface 211 and the second surface 212. The first tool placement section 221 is provided on the third surface 213. The first tool placement section 221 has a groove shape that extends in the second direction 202 while recessing in the fourth direction 204 from the third surface 213, and opens on the first surface 211 and the second surface 212. The groove width of the first tool placement section 221 is longer than the groove width of the second tool placement section 222. When the block 210 is cut by a plane perpendicular to the second direction 202, the first tool placement section 221 has a rectangular opening surface.

[0061] The second tool placement section 222 has a groove shape that extends in a third direction 203 oblique to the second direction 202, between the first surface 211 and the second surface 212. The second tool placement section 222 is provided on the third surface 213. The second tool placement section 222 has a groove shape that extends in the third direction 203 while recessing in the fourth direction 204 from the third surface 213, and opens on the first surface 211 and the second surface 212. The third direction 203 is oblique to the second direction 202 and perpendicular to the fourth direction 204. When the block 210 is cut by a plane perpendicular to the third direction 203, the second tool placement section 222 has a rectangular opening surface.

[0062] The distance between the first tool placement section 221 and the second tool placement section 222 in the first direction 201 increases as you move from the first surface 211 to the second surface 212 in the second direction 202.

[0063] The shank 51 of the first tool T1 is positioned in the groove-shaped first tool placement section 221. The shank 51 of the second tool T2 is positioned in the groove-shaped second tool placement section 222. The end of the shank 51 to which the tip 52 is attached protrudes from the respective placement sections of the first tool placement section 221 and the second tool placement section 222 into the space on the second surface 212. The tip 52 is positioned away from the second surface 212 in the second direction 202.

[0064] Figure 11 is a cross-sectional view of the tool holder as seen in the direction of the arrow along the line XI-XI in Figure 5. Figure 12 is a cross-sectional view of the tool holder as seen in the direction of the arrow along the line XII-XII in Figure 5.

[0065] Referring to Figures 5 to 12, the tool holder 10A further includes a wedge member 231. The wedge member 231 is provided in the first tool placement section 221. The wedge member 231 fixes the first tool T1, which is placed in the first tool placement section 221, to the block 210 by applying a wedge force to the first tool T1.

[0066] The wedge member 231 includes a first wedge piece 232 and a second wedge piece 233. The first wedge piece 232 and the second wedge piece 233 are arranged together with the first tool T1 in a groove-shaped first tool placement section 221. The first wedge piece 232 and the second wedge piece 233 are positioned adjacent to the first tool T1 in the first direction 201. The first wedge piece 232 is positioned between the first tool T1 and the second wedge piece 233 in the first direction 201.

[0067] The first wedge piece 232 has a tapered surface 232a. The second wedge piece 233 has a tapered surface 233a. The tapered surface 232a extends in a strip shape in the second direction 202, while being inclined with respect to the fourth direction 204. The distance between the first tool T1 (shank 51) and the tapered surface 232a in the first direction 201 decreases in the fourth direction 204 as it moves from the third surface 213 toward the bottom of the groove of the first tool placement section 221. The tapered surface 233a is in surface contact with the tapered surface 232a. The tapered surface 233a has a tapered shape corresponding to the tapered surface 232a.

[0068] The first wedge piece 232 is fastened to the bottom of the groove in the first tool placement section 221 using a bolt or the like. In this configuration, the axial force of the bolt along the fourth direction 204 is converted into a wedge force along the first direction 201 at the tapered surfaces 233a and 232a that are in surface contact with each other. This wedge force along the first direction 201 acts on the shank 51 of the first tool T1, pressing the shank 51 against the groove wall of the first tool placement section 221.

[0069] The tool holder 10A further includes a screw member 241. The screw member 241 is provided in the second tool placement section 222. The screw member 241 fixes the second tool T2, which is placed in the second tool placement section 222, to the block 210 by applying a screw axial force to the second tool T2.

[0070] The block 210 is provided with a plurality of screw holes 246. The screw holes 246 extend from the sixth surface 216 in a direction perpendicular to the third direction 203 and open into the groove wall of the second tool placement section 222. The plurality of screw holes 246 are spaced apart from each other in the third direction 203. The screw members 241 consist of hollow sets (screws with a hexagonal hole in the head). Each of the plurality of screw members 241 is screwed into the plurality of screw holes 246. The tip of the screw member 241 abuts against the shank 51 of the second tool T2 placed in the second tool placement section 222, and the axial force (tightening force) of the screw member 241 acts on the shank 51.

[0071] Block 210 is further provided with a third tool placement section 223 and a fourth tool placement section 224. The third tool placement section 223 and the fourth tool placement section 224 are provided on the fourth surface 214. The fourth tool placement section 224 is located away from the third tool placement section 223 in the first direction 201. The third tool placement section 223 and the fourth tool placement section 224 are spaced apart from each other in the first direction 201.

[0072] The third tool placement section 223 faces the first tool placement section 221 in the fourth direction 204. The third tool placement section 223 has a groove shape similar to that of the first tool placement section 221. The fourth tool placement section 224 faces the second tool placement section 222 in the fourth direction 204. The fourth tool placement section 224 has a groove shape similar to that of the second tool placement section 222. The third tool placement section 223 and the fourth tool placement section 224 have shapes that are symmetrical to the first tool placement section 221 and the second tool placement section 222, respectively, across a virtual plane that includes the first direction 201 and the second direction 202.

[0073] The third tool T3 is positioned in the third tool placement section 223. The third tool T3 is fixed to the block 210 by a wedge member 231, similar to the first tool T1. The fourth tool T4 is positioned in the fourth tool placement section 224. The fourth tool T4 is fixed to the block 210 by a plurality of screw members 241, similar to the second tool T2. The third tool T3 and the fourth tool T4 referred to here are cutting tools for external diameter machining.

[0074] In this configuration, the tool T positioned at the workpiece machining position Wp is held by the first workpiece spindle 21 and machined while rotating in the forward direction by a tip 52 facing in the +Y axis direction, or by the second workpiece spindle 26 and machined while rotating in the reverse direction. In this case, a force in the -Y axis direction acts from the workpiece on the tool T. The tool holder 10 can receive forces from the first tool T1 or the third tool T3 at the groove wall of the first tool placement section 221, and forces from the second tool T2 or the fourth tool T4 at the groove wall of the second tool placement section 222, thereby effectively suppressing vibrations during workpiece machining.

[0075] Furthermore, it is possible to mount the tool T on the block 210 by reversing the orientation shown in Figure 2 so that the tip 52 of the tool T positioned at the workpiece machining position Wp faces in the -Y axis direction. In this configuration, the tip 52 of the tool T positioned at the workpiece machining position Wp, facing in the -Y axis direction, is used to machine a workpiece held by the first workpiece spindle 21 and rotating in the reverse direction, or to machine a workpiece held by the second workpiece spindle 26 and rotating in the forward direction. In this case, a force in the +Y axis direction acts from the workpiece on the tool T. Since the tool holder 10 can receive forces from the first tool T1 or the third tool T3 on the side surface of the wedge member 231, vibrations during workpiece machining can be effectively suppressed. On the other hand, since the tool holder 10 receives forces from the second tool T2 or the fourth tool T4 on multiple screw members 241, there is a possibility that vibrations will occur during workpiece machining in this case.

[0076] Referring to Figures 5 to 10, the block 210 is further provided with a plurality of bolt holes 218. The bolt holes 218 extend in the second direction 202 and open to the first surface 211 and the second surface 212. The plurality of bolt holes 218 are arranged in a grid pattern with spacing between them in the first direction 201 and the fourth direction 204.

[0077] Multiple bolts are inserted into each of the multiple bolt holes 218. The block 210 is fastened to the tool post 30 (swivel section 31) using these bolts.

[0078] Furthermore, the block 210 is configured such that the mounting position of the block 210 with respect to the tool post 30 can be selected from a first position shown in Figure 2 and a second position which is the first position inverted so that the fifth surface 215 and the sixth surface 216 are swapped with each other.

[0079] Referring to Figures 3 and 5, the length La of the first tool T1 placed in the first tool placement section 221 is longer than the length Lb of the first tool T1 protruding from the second surface 212 (La > Lb). The length Lc of the second tool T2 placed in the second tool placement section 222 is longer than the length Ld of the second tool T2 protruding from the second surface 212 (Lc > Ld). As an example, the values ​​of La and Lc are 95 mm, and the values ​​of Lb and Ld are 30 mm.

[0080] Length La may be more than twice length Lb (La ≥ 2 × Lb) or more than three times length Lb (La ≥ 3 × Lb). Length Lc may be more than twice length Ld (Lc ≥ 2 × Ld) or more than three times length Ld (Lc ≥ 3 × Ld). The length relationship between the first tool T1 and the first tool placement section 221, and the length relationship between the second tool T2 and the second tool placement section 222 have been explained as representative examples, but the same relationships apply to the third tool T3 and the fourth tool T4.

[0081] Figure 13 is a perspective view showing the internal structure of the block in Figure 6. Referring to Figures 5 through 10 and Figure 13, the tool holder 10A further has a nozzle 251. The nozzle 251 is capable of discharging coolant. The nozzle 251 is mounted on the second surface 212.

[0082] The tool holder 10A has nozzles 251, including a first nozzle 251A, a second nozzle 251B, a third nozzle 251C, and a fourth nozzle 251D. The first nozzle 251A, the second nozzle 251B, the third nozzle 251C, and the fourth nozzle 251D are arranged in a grid pattern with spacing between them in both the first direction 201 and the fourth direction 204. In the first direction 201, the first nozzle 251A, the second nozzle 251B, the third nozzle 251C, and the fourth nozzle 251D are positioned closer to the fifth surface 215 than to the sixth surface 216. In the fourth direction 204, the first nozzle 251A, the second nozzle 251B, the third nozzle 251C, and the fourth nozzle 251D are positioned between the first tool placement section 221 and the third tool placement section 223. The first nozzle 251A, the second nozzle 251B, the third nozzle 251C, and the fourth nozzle 251D are located inside the multiple bolt holes 218.

[0083] When the swivel section 31 is indexed to the regular indexing positions (angular positions P01, P02, P03, P04, P05, P06, P07, P08, P09, P10) of station numbers 1 to 10, coolant is supplied from the tool post base 32 through the swivel section 31 to the tool holder 10 positioned at the workpiece machining position Wp. The coolant passes through the hole 256, which will be described later, and is discharged from the first nozzle 251A and the second nozzle 251B toward the machining point of the first tool T1 and the workpiece, and from the third nozzle 251C and the fourth nozzle 251D toward the machining point of the third tool T3 and the workpiece.

[0084] As shown in Figure 13, the block 210 is further provided with holes 256. The holes 256 include a first hole 256a, a second hole 256b, a third hole 256c, a fourth hole 256d, a fifth hole 256e, a sixth hole 256f, a seventh hole 256g, an eighth hole 256h, and a ninth hole 256i.

[0085] The first hole 256a, the second hole 256b, the third hole 256c, and the fourth hole 256d extend in the second direction 202 and open to the second surface 212. The openings of the first hole 256a, the second hole 256b, the third hole 256c, and the fourth hole 256d on the second surface 212 are fitted with the first nozzle 251A, the second nozzle 251B, the third nozzle 251C, and the fourth nozzle 251D, respectively.

[0086] The fifth hole 256e and the sixth hole 256f extend in the fourth direction 204, spaced apart from each other in the first direction 201. The fifth hole 256e is connected to the first hole 256a and the third hole 256c. The sixth hole 256f is connected to the second hole 256b and the fourth hole 256d. The seventh hole 256g extends in the first direction 201. The seventh hole 256g is connected to the fifth hole 256e and the sixth hole 256f. The fifth hole 256e and the sixth hole 256f are in communication with each other via the seventh hole 256g.

[0087] The eighth hole 256h and the ninth hole 256i extend in the second direction 202 and open to the first surface 211. The eighth hole 256h and the ninth hole 256i are connected to the fifth hole 256e and the sixth hole 256f, respectively.

[0088] When block 210 is mounted on the tool post 30 in the first position shown in Figure 2, coolant from the tool post 30 (swivel section 31) flows into either the eighth hole 256h or the ninth hole 256i. When block 210 is mounted on the tool post 30 in a second position, which is the inversion from the first position such that the fifth surface 215 and the sixth surface 216 are swapped, coolant from the tool post 30 (swivel section 31) flows into either the eighth hole 256h or the ninth hole 256i. The coolant is supplied to the first nozzle 251A, the second nozzle 251B, the third nozzle 251C, and the fourth nozzle 251D through the fifth hole 256e, the sixth hole 256f, the seventh hole 256g, the first hole 256a, the second hole 256b, the third hole 256c, and the fourth hole 256d.

[0089] Next, we will describe the more specific structure of the internal diameter machining tool holder 10B. The internal diameter machining tool holder 10B has basically the same structure as the external diameter machining tool holder 10A. The following description will focus on the structural differences from the external diameter machining tool holder 10A.

[0090] Figures 14 and 15 are perspective views showing a tool holder for internal diameter machining. Figure 16 is a perspective view showing the blocks that make up the tool holder for internal diameter machining. Figure 17 is a side view showing the blocks as seen in the direction indicated by arrow XVII in Figure 16. Figure 18 is a side view showing the blocks as seen in the direction indicated by arrow XVIII in Figure 16. Figure 19 is a top view showing the blocks as seen in the direction indicated by arrow XIX in Figure 16.

[0091] Referring to Figures 14 to 19, the tool holder 10B has a block 310. Block 310 corresponds to block 210 in the tool holder 10A. Block 310 has a first surface 311, a second surface 312, a third surface 313, a fourth surface 314, a fifth surface 315, and a sixth surface 316. The first surface 311, the second surface 312, the third surface 313, the fourth surface 314, the fifth surface 315, and the sixth surface 316 correspond to the first surface 211, the second surface 212, the third surface 213, the fourth surface 214, the fifth surface 215, and the sixth surface 216 in the tool holder 10A, respectively.

[0092] The first surface 311 is one of several sides of the tool holder 10B that is attached to the tool post 30. When the tool holder 10B is viewed along a second direction 202 perpendicular to the first surface 311, the length L4 of the second surface 312 is longer than the length L3 of the first surface 311 in the first direction 201 (L4 > L3).

[0093] The block 310 is provided with a first tool placement section 321 and a second tool placement section 322. The first tool placement section 321 and the second tool placement section 322 correspond to the first tool placement section 221 and the second tool placement section 222 of the tool holder 10A, respectively.

[0094] As shown in Figure 16, the first tool T1 is positioned in the first tool placement section 321. The second tool T2 is positioned in the second tool placement section 322. The second tool placement section 322 is located away from the first tool placement section 321 in the first direction 201.

[0095] The first tool placement section 321 is located between the fifth surface 315 and the second tool placement section 322 in the first direction 201. The second tool placement section 322 is located between the first tool placement section 321 and the sixth surface 316 in the first direction 201. The first tool placement section 321 is located closer to the fifth surface 315 than to the sixth surface 316 in the first direction 201. The first tool placement section 321 is projected onto the first surface 311 in the second direction 202. The second tool placement section 322 is located closer to the sixth surface 316 than to the fifth surface 315 in the first direction 201. The second tool placement section 322 is projected onto the first surface 311 in the second direction 202, shifted toward the first direction 201.

[0096] The first tool placement section 321 and the second tool placement section 322 are located in the second direction 202, closer to the second surface 312 than to the first surface 311.

[0097] The first tool placement section 321 has a hole shape extending in the fourth direction 204 between the third surface 313 and the fourth surface 314. The first tool placement section 321 has a circular opening surface on the third surface 313 and the fourth surface 314. The first tool placement section 321 has a convex shape on the second surface 312 that protrudes in the second direction 202 while extending in the fourth direction 204. The second tool placement section 322 has a hole shape extending in the fourth direction 204 between the third surface 313 and the fourth surface 314. The second tool placement section 322 has a circular opening surface on the third surface 313 and the fourth surface 314. The second tool placement section 322 has a convex shape on the second surface 312 that protrudes in the second direction 202 while extending in the fourth direction 204.

[0098] As shown in Figure 16, the shank 51 of the first tool T1 is positioned in the first tool placement section 321, which has a hole shape. The shank 51 of the second tool T2 is positioned in the second tool placement section 322, which also has a hole shape. The end of the shank 51 to which the tip 52 is attached protrudes from the first tool placement section 321 and the second tool placement section 322 into the space on the third surface 313. The tip 52 is positioned away from the third surface 313 in the fourth direction 204.

[0099] The tool holder 10B further includes a screw member 341. The screw member 341 is provided in the first tool placement section 321 and the second tool placement section 322. The screw member 341 fixes the first tool T1, which is placed in the first tool placement section 321, to the block 310 by applying a screw axial force to it. The screw member 341 also fixes the second tool T2, which is placed in the second tool placement section 322, to the block 310 by applying a screw axial force to it.

[0100] The block 210 is provided with a plurality of screw holes 346. The screw holes 346 consist of through holes opening into the inner walls of the first tool placement section 321 and the second tool placement section 322. The screw members 341 consist of a hollow set. Each of the plurality of screw members 341 is screwed into the plurality of screw holes 346. The tip of the screw member 341 abuts against the shank 51 of the first tool T1 placed in the first tool placement section 321, thereby applying the axial force (tightening force) of the screw member 341 to the shank 51. The tip of the screw member 341 abuts against the shank 51 of the second tool T2 placed in the second tool placement section 322, thereby applying the axial force of the screw member 341 to the shank 51.

[0101] As shown in Figure 15, the second tool placement section 322 may be equipped with a fourth tool T4, which is used for machining a workpiece held on the second workpiece spindle 26, instead of the second tool T2, which is used for machining a workpiece held on the first workpiece spindle 21. In this case, the end of the shank 51 to which the tip 52 is attached protrudes from the second tool placement section 322 into the space on the fourth surface 314.

[0102] Although not shown in the figure, the first tool placement section 321 may be equipped with a third tool T3, which is used for machining a workpiece held on the second workpiece spindle 26, instead of the first tool T1, which is used for machining a workpiece held on the first workpiece spindle 21.

[0103] Block 310 is further provided with a plurality of bolt holes 318. The plurality of bolt holes 318 correspond to the plurality of bolt holes 218 in the tool holder 10A.

[0104] Figure 20 is a perspective view showing the internal structure of the block in Figure 16. Referring to Figures 14 through 20, the tool holder 10B further has a nozzle 351. The nozzle 351 corresponds to the nozzle 251 in the tool holder 10A. The nozzle 251 is mounted on the sides of the third surface 313 and the fourth surface 314.

[0105] The tool holder 10B has a plurality of nozzles 351. The plurality of nozzles 351 are arranged around the opening surface of the first tool placement section 321 on the third surface 313. The plurality of nozzles 351 are arranged around the opening surface of the first tool placement section 321 on the fourth surface 314. Coolant passes through a hole 356, which will be described later, and is discharged from the plurality of nozzles 351 toward the machining point between the first tool T1 or the third tool T3 and the workpiece.

[0106] As shown in Figure 20, the block 310 is further provided with holes 356. Holes 356 correspond to holes 256 in the tool holder 10A. Holes 356 include a first hole 356a, a second hole 356b, a third hole 356c, a fourth hole 356d, a fifth hole 356e, a sixth hole 356f, a seventh hole 356g, an eighth hole 356h, and a ninth hole 356i.

[0107] The first hole 356a and the second hole 356b extend in the fourth direction 204 and open to the third surface 313 and the fourth surface 314. Nozzles 351 are attached to each opening of the first hole 356a and the second hole 356b on the third surface 313, and to each opening of the first hole 356a and the second hole 356b on the fourth surface 314.

[0108] The third hole 356c and the fourth hole 356d extend in the second direction 202. The third hole 356c and the fourth hole 356d are connected to the first hole 356a and the second hole 356b, respectively. The fifth hole 356e and the sixth hole 356f extend in the fourth direction 204. The fifth hole 356e and the sixth hole 356f are connected to the third hole 356c and the fourth hole 356d, respectively. The seventh hole 356g extends in the first direction 201. The seventh hole 356g is connected to the third hole 356c and the fourth hole 356d. The third hole 356c and the fourth hole 356d are in communication with each other via the seventh hole 356g.

[0109] The eighth hole 356h and the ninth hole 356i extend in the second direction 202 and open to the first surface 311. The eighth hole 356h and the ninth hole 356i are connected to the fifth hole 356e and the sixth hole 356f, respectively.

[0110] When block 310 is mounted on the tool post 30 in the first position shown in Figure 2, coolant from the tool post 30 (swivel section 31) flows into either the eighth hole 356h or the ninth hole 356i. When block 310 is mounted on the tool post 30 in a second position, which is the inversion from the first position such that the fifth surface 315 and the sixth surface 316 are swapped, coolant from the tool post 30 (swivel section 31) flows into either the eighth hole 356h or the ninth hole 356i. The coolant is supplied to a plurality of nozzles 351 through the fifth hole 356e, the sixth hole 356f, the seventh hole 356g, the third hole 356c, the fourth hole 356d, the first hole 356a, and the second hole 256b.

[0111] To summarize the configuration of the tool holder 10 (10A / 10B) in the embodiment of the present invention described above, the tool holder 10 (10A / 10B) in this embodiment is a tool holder that is mounted on a turret-type tool post 30 and holds a tool. The tool holder 10 (10A / 10B) comprises a first surface 211 / 311 attached to the tool post 30, a second surface 212 / 312 facing the first surface 211 / 311, a first tool placement section 221 / 321 on which the first tool T1 is placed, and a second tool placement section 222 / 322 located away from the first tool placement section 221 / 321 in a first direction 201 on which the second tool T2 is placed. When viewed along the second direction 202, which is perpendicular to the first surface 211 / 311, the length L2 / L4 of the second surface 212 / 312 is longer than the length L1 / L3 of the first surface 211 / 311 in the first direction 201.

[0112] With this configuration, the tool holder 10 (10A / 10B) has a shape that extends in the first direction 201 from the first surface 211 / 311 attached to the tool post 30 toward the second surface 212 / 312 facing the first surface 211 / 311. As a result, the first tool placement section 221 / 321 and the second tool placement section 222 / 322 can be positioned far apart from each other in the first direction 201, at a distance from the first surface 211 / 311 toward the second direction 202. This makes it possible to position the cutting edge of the first tool T1 placed in the first tool placement section 221 / 321 and the cutting edge of the second tool T2 placed in the second tool placement section 222 / 322 with sufficient spacing between them.

[0113] Furthermore, the first tool placement section 221 has a groove shape extending in a second direction 202 between the first surface 211 and the second surface 212. The second tool placement section 222 has a groove shape extending in a third direction 203 oblique to the second direction 202 between the first surface 211 and the second surface 212. The distance between the first tool placement section 221 and the second tool placement section 222 in the first direction 201 increases as it approaches the second surface 212 from the first surface 211.

[0114] With this configuration, when the first tool T1 and the second tool T2 for outer diameter machining are placed in the first tool placement section 221 and the second tool placement section 222, respectively, it becomes possible to position the cutting edges of the first tool T1 and the second tool T2, which are positioned to protrude from the second surface 212, with sufficient spacing between them.

[0115] Furthermore, the tool holder 10A includes a wedge member 231 provided in the first tool placement section 221 that fixes the first tool T1 by applying a wedge force to the first tool T1, and a screw member 241 provided in the second tool placement section 222 that fixes the second tool T2 by applying a screw axial force to the second tool T2.

[0116] With this configuration, the first tool T1 can be more securely fixed by using the wedge member 231 as the fixing means for the first tool T1. Furthermore, the second tool T2 can be fixed in a more compact space by using the screw member 241 as the fixing means for the second tool T2.

[0117] Furthermore, the tool holder 10A includes a third tool placement section 223 that is parallel to the first surface 211 and faces the first tool placement section 221 in a fourth direction 204 perpendicular to the first direction 201, and where the third tool T3 is placed; and a fourth tool placement section 224 that faces the second tool placement section 222 in the fourth direction 204, is located away from the third tool placement section 223 in the first direction 201, and where the fourth tool T4 is placed.

[0118] With this configuration, the first tool T1 and the second tool T2, which are positioned in the first tool placement section 221 and the second tool placement section 222 respectively, enable machining of the workpiece held on the first workpiece spindle 21, and the third tool T3 and the fourth tool T4, which are positioned in the third tool placement section 223 and the fourth tool placement section 224 respectively, enable machining of the workpiece held on the second workpiece spindle 26.

[0119] Furthermore, each of the first tool placement section 321 and the second tool placement section 322 is parallel to the first surface 311 and has a hole shape that penetrates in a fourth direction 204 perpendicular to the first direction 201. The first tool placement section 321 and the second tool placement section 322 are positioned in the second direction 202 closer to the second surface 312 than to the first surface 311.

[0120] With this configuration, when the first tool T1 and the second tool T2 for internal diameter machining are placed in the first tool placement section 321 and the second tool placement section 322, respectively, it becomes possible to position the cutting edges of the first tool T1 and the second tool T2, which protrude from the block 310 in the fourth direction 204, at a sufficient distance from each other.

[0121] The machine tool 100 in this embodiment includes a tool post 30 having a swivel section 31 capable of rotational movement, and a tool holder 10 attached to the swivel section 31. The first direction 201 corresponds to the tangential direction of the circumference centered on the pivot axis 150 of the swivel section 31. The tool post 30 is indexable to a plurality of angular positions P01 to P20 in the circumferential direction centered on the pivot axis 150, including a first angular position P01 for positioning the first tool T1 at a predetermined workpiece machining position Wp, and a second angular position P11 for positioning the second tool T2 at a predetermined workpiece machining position Wp.

[0122] With this configuration, by indexing the swivel section 31 to a first angular position P01, workpiece machining using the first tool T1 is made possible, and by indexing the swivel section 31 to a second angular position P11, workpiece machining using the second tool T2 is made possible.

[0123] Furthermore, the length La of the first tool T1 positioned in the first tool positioning section 221 is longer than the length Lb of the first tool T1 protruding from the second surface 212, and the length Lc of the second tool T2 positioned in the second tool positioning section 222 is longer than the length Ld of the second tool T2 protruding from the second surface 212.

[0124] With this configuration, the first tool T1 and the second tool T2 can be held more firmly in the tool holder 10, thereby suppressing the generation of vibrations during workpiece machining.

[0125] The tool holder 10 (10A / 10B) in this embodiment includes a block 210 / 310 having a first surface 211 / 311 attached to the tool post 30 and a second surface 212 / 312 facing the first surface 211 / 311, and a first tool placement section 221 / 321 on which a first tool T1 is placed, and a second tool placement section 222 / 322 located away from the first tool placement section 221 / 321 in a first direction 201 parallel to the first surface 211 / 311, on which a second tool T2 is placed. When the block 210 / 310 is viewed along a second direction 202 perpendicular to the first surface 211 / 311, the length L2 / L4 of the second surface 212 / 312 in the first direction 201 is longer than the length L1 / L3 of the first surface 211 / 311 in the first direction 201.

[0126] The embodiments disclosed herein should be considered in all respects to be illustrative and not restrictive. The scope of the present invention is indicated by the claims rather than by the foregoing description, and all modifications within the meaning and scope equivalent to the claims are intended to be included. [Explanation of Symbols]

[0127] 10,10A,10B Tool holder, 16 Bed, 21 First work spindle, 22,27 Chuck, 26 Second work spindle, 30 Tool post, 31 Swivel section, 32 Tool post base, 36 Mounting surface, 41 Tool spindle, 42 Spindle end face, 51 Shank, 52 Chip, 100 Machine tool, 110,120,140 Rotation axis, 130,150 Swivel axis, 160 Machining area, 201 First direction, 202 Second direction, 203 Third direction, 204 Fourth direction, 210,310 Block, 211,311 First face, 212,312 Second face, 213,313 Third face, 214,314 Fourth face, 215,315 Fifth face, 216,316 Sixth surface, 218,318 bolt holes, 221,321 first tool placement area, 222,322 second tool placement area, 223 third tool placement area, 224 fourth tool placement area, 231 wedge member, 232 first wedge piece, 232a,233a tapered surface, 233 second wedge piece, 241,341 threaded member, 246,346 threaded holes, 251,351 nozzle, 251A first nozzle, 251B second nozzle, 251C third nozzle, 251D fourth nozzle, 256,356 holes, 256a,356a first hole, 256b,356b second hole, 256c,356c third hole, 256d,356d fourth hole, 256e,356e 5th hole, 256f, 356f 6th hole, 256g, 356g 7th hole, 256h, 356h 8th hole, 256i, 356i 9th hole, T tool, T1 1st tool, T2 2nd tool, T3 3rd tool, T4 4th tool, W workpiece, Wp workpiece machining position.

Claims

1. A tool holder that is mounted on a turret-type tool post and holds a tool, The first surface attached to the tool rest, The second surface opposite the first surface, A first tool placement section where the first tool is placed, The apparatus comprises a second tool arrangement section located away from the first tool arrangement section in a first direction, on which a second tool is arranged, When viewed along a second direction perpendicular to the first surface, in the first direction, the length of the second surface is longer than the length of the first surface, and furthermore, A fifth surface perpendicular to the first surface and extending between the first and second surfaces, The present invention further comprises a sixth surface that intersects the first surface obliquely, extends between the first and second surfaces, and faces the fifth surface in the first direction, A tool holder in which, when viewed in a fourth direction parallel to the first surface and perpendicular to the first direction, the first tool placement portion is located in the region between the first and second surfaces in the second direction, and at least a portion of the second tool placement portion is located in the region between the sixth and second surfaces in the second direction.

2. The first tool placement section has a groove shape extending in the second direction between the first surface and the second surface, The second tool placement section has a groove shape that extends in a third direction oblique to the second direction between the first surface and the second surface, The tool holder according to claim 1, wherein the distance between the first tool placement portion and the second tool placement portion in the first direction increases as it approaches the second surface from the first surface.

3. A wedge member provided in the first tool placement section, which fixes the first tool by applying a wedge force to the first tool, The tool holder according to claim 1 or 2, further comprising a screw member provided in the second tool placement portion for fixing the second tool by applying a screw axial force to the second tool.

4. In the fourth direction, a third tool arrangement portion facing the first tool arrangement portion and on which the third tool is arranged, The tool holder according to claim 1 or 2, further comprising a fourth tool arrangement portion which faces the second tool arrangement portion in the fourth direction, is located away from the third tool arrangement portion in the first direction, and on which a fourth tool is arranged.

5. Each of the first tool placement section and the second tool placement section has a hole shape that penetrates in the fourth direction, The tool holder according to claim 1, wherein the first tool placement section and the second tool placement section are provided in a position closer to the second surface than to the first surface in the second direction.

6. The tool post having a swivel section capable of rotational movement, The tool holder described in claim 1 or 2 is attached to the aforementioned rotating section, The first direction corresponds to the tangential direction of the circumference centered on the pivot axis of the pivot section, The tool post is a machine tool in which the swivel section can be indexed to a plurality of angular positions in the circumferential direction about the pivot axis, including a first angular position for positioning the first tool at a predetermined workpiece machining position and a second angular position for positioning the second tool at the predetermined workpiece machining position.

7. The machine tool according to claim 6, wherein the length of the first tool placed in the first tool placement section is longer than the length of the first tool protruding from the second surface, and the length of the second tool placed in the second tool placement section is longer than the length of the second tool protruding from the second surface.

Images