machine tools

Abstract

In order to provide a machine tool that does not require a large space around the tool unit and also does not require limiting the rotation angle of the tool unit, the automatic lathe (100) is equipped with a front spindle (20) that holds a workpiece (W) and a turret (31) in which the circumferential surface is divided into a plurality of turret surfaces (31n, 31c, …, 31k), and a tool (40, 61, 62, 63, 64, 65) is mounted on the turret surfaces (31n, 31c, …, 31k) and rotates around the Z-axis to perform machining on the workpiece (W) by any one selected tool, and the turret (31) is configured such that at least one of the turret surfaces (31n) is set to have a shorter distance from the Z-axis compared to the other turret surfaces (31c~31k).

Description

Technology Field

[0001] The present invention relates to a machine tool equipped with a turret. Background Technology

[0002] A machine tool is known that has a turret in which the circumferential surface is divided into a plurality of attachment surfaces and each attachment surface is equipped with a tool mounting portion, and a main shaft that holds a workpiece (see, for example, Patent Document 1). This machine tool is installed so that the turret can rotate to machine a workpiece held on the main shaft with a tool mounted on one of the selected tool mounting portions.

[0003] In addition, a machine tool is also proposed that is equipped with a tool unit capable of indexing, which changes the angle relative to the main spindle, on the tool mounting part, so-called B-axis rotation (rotation around the Y-axis) (see, for example, Patent Document 2). Prior art literature

[0004] Japanese Patent Publication No. 2003-225802 Japanese Patent Publication No. 2013-226611 The problem to be solved

[0005] However, since the B-axis pivoting tool unit pivots around the axis of the mounting surface to which it is attached (the Y-axis perpendicular to the mounting surface), it is necessary to secure a large space around it so that the tool unit does not interfere with its surroundings (e.g., the main shaft or cover) as it pivots.

[0006] In addition, in machine tools where such a large space cannot be secured, it is necessary to limit the pivoting angle of the B-axis pivoting tool unit to a range that does not interfere with the surroundings.

[0007] The present invention has been made in consideration of the above circumstances and aims to provide a machine tool that does not require securing a large space around the tool unit and does not require limiting the pivoting angle of the tool unit. means of solving the problem

[0008] The present invention is a machine tool comprising a main shaft that holds a workpiece, a turret having a circumferential surface around a pivot axis and a cross-sectional surface perpendicular to the pivot axis, wherein the circumferential surface is divided into a plurality of attachment surfaces, and a tool is mounted on the plurality of attachment surfaces and rotates around the pivot axis to perform machining on the workpiece by any of the tool at a selected pivot position, wherein the turret is configured such that at least one of the attachment surfaces is set to be shorter in distance from the pivot axis than the other attachment surfaces. Effects of the invention

[0009] According to the machine tool of the present invention, there is no need to secure a large space around the tool unit, and there is also no need to limit the pivoting angle of the tool unit. Brief explanation of the drawing

[0010] FIG. 1 is a perspective view showing the main configuration of an automatic lathe, which is an embodiment of the present invention. Figure 2 is a cross-sectional view along the Z-axis of the first turret blade. FIG. 3 is a front view of the first turret blade assembly viewed from the front and rear in the Z-axis direction of the first turret blade assembly. FIG. 4 is a schematic plan view showing a space including a front main shaft, a first turret blade band, a rear main shaft, and a second turret blade band, divided into a processing room, and shows the first turret blade band being moved away from the front main shaft. FIG. 5 is a schematic plan view showing a space including a front main shaft, a first turret blade band, a rear main shaft, and a second turret blade band, divided into a processing room, and shows a state where the first turret blade band is close to the front main shaft. FIG. 6 is a schematic diagram showing the machinable range that can be machined by a tool when the turret is in the normal position, when it is in the upper position, and when it is in the lower position. Specific details for implementing the invention

[0011] Hereinafter, an automatic lathe (100), which is an example of a machine tool according to the present invention, will be described with reference to the drawings.

[0012] FIG. 1 is a perspective view showing the main configuration of an automatic lathe (100) which is an embodiment of the present invention. The automatic lathe (100) shown has a bed (10), a front main shaft (20), a first turret blade assembly (30), a rear main shaft (80), and a second turret blade assembly (90) installed therein.

[0013] The front main shaft (20) is equipped with a collet chuck at its tip and holds a rod-shaped work (W) (see FIG. 4 and FIG. 5 described later) by means of this collet chuck. The front main shaft (20) is rotatable around the Z-axis, which is the extended direction of the shaft, and thereby can rotate the held work (W) around the axis (Z-axis).

[0014] The rear main shaft (80) is positioned facing the front of the front main shaft (20) in the Z-axis direction (front of the front main shaft (20) in the Z-axis direction (direction of the first turret blade assembly (30))). The rear main shaft (80) is also equipped with a collet chuck at its tip, and the rear main shaft (80) can receive and hold the work (W) held by the front main shaft (20) through this collet chuck.

[0015] The rear main axis (80) can also rotate around the Z-axis, which is the extended direction of the main axis, and thereby the workpiece (W) held can be rotated around the axis (Z-axis).

[0016] The rear main shaft (80) is installed on the rear main shaft X-axis slide (14b). The rear main shaft X-axis slide (14b) is installed on the rear main shaft Z-axis slide (14a). The rear main shaft Z-axis slide (14a) is movable in the Z-axis direction relative to the bed (10), and the rear main shaft X-axis slide (14b) is movable in the X-axis direction relative to the rear main shaft Z-axis slide (14a). The X-axis is set at a predetermined angle (e.g., about 60 degrees) relative to the horizontal plane.

[0017] Accordingly, the rear main shaft (80) is installed to be movable in the Z-axis direction and the X-axis direction with respect to the bed (10).

[0018] The first turret blade assembly (30) is positioned in parallel with the rear main shaft (80) in the front of the front main shaft (20) in the Z-axis direction (in the front of the front main shaft (20) in the Z-axis direction). The first turret blade assembly (30) performs machining on a work (W) held on the front main shaft (20) (see FIG. 4) or a work (W) held on the rear main shaft (80) using a predetermined tool.

[0019] The first turret blade assembly (30) is installed on the first blade assembly Y-axis slide (16), the first blade assembly Y-axis slide (16) is installed on the first blade assembly X-axis slide (15), and the first blade assembly X-axis slide (15) is installed on the first blade assembly Z-axis slide (17).

[0020] The first blade member Z-axis slide (17) is installed to be movable along the Z-axis direction with respect to the bed (10). The first blade member X-axis slide (15) is installed on the first blade member Z-axis slide (17) to be movable along the X-axis direction which is orthogonal to the Z-axis direction. The first blade member Y-axis slide (16) is installed on the first blade member X-axis slide (15) to be movable along the Y-axis direction which is orthogonal to the Z-axis direction and the X-axis direction.

[0021] The first turret blade assembly (30) moves in the X-axis direction with respect to the work (W) protruding from the front end of the front end of the front end of the front end of the front end of the front end of the first blade assembly X-axis slide (15) by moving in the X-axis direction with respect to the first blade assembly Z-axis slide (17), and moves in the Y-axis direction with respect to the work (W) protruding from the front end of the front end of the front end of the front end of the front end of the front end of the front end of the front end of the front end of the front end of the first blade assembly Y-axis slide (16) by moving in the Y-axis direction with respect to the first blade assembly X-axis slide (15). The same applies to the work (W) protruding from the front end of the back end of the back end of the back end of the back end of the back end of the back end of the back end of the back end of the back end of the back end of the back end of the back end of the back end of the back end of the front end of the first blade assembly (80).

[0022] The second turret blade assembly (90) is positioned facing the front of the rear main shaft (80) in the Z-axis direction (front of the rear main shaft (80) in the Z-axis direction). The second turret blade assembly (90) performs machining on a workpiece (W) held on the front main shaft (20) or a workpiece (W) held on the rear main shaft (80) using a tool.

[0023] The second turret blade assembly (90) is installed on the second blade assembly inclined Y-axis slide (13), the second blade assembly inclined Y-axis slide (13) is installed on the second blade assembly X-axis slide (12), and the second blade assembly X-axis slide (12) is installed on the second blade assembly Z-axis slide (11).

[0024] The second blade member Z-axis slide (11) is installed to be movable along the Z-axis direction relative to the bed (10). The second blade member X-axis slide (12) is installed on the second blade member Z-axis slide (11) to be movable along the X-axis direction. The second blade member inclined Y-axis slide (13) is installed on the second blade member X-axis slide (12) to be movable along the inclined Y-axis direction, which is orthogonal to the Z-axis direction and also intersects the Y-axis at a predetermined angle.

[0025] The second turret blade assembly (90) moves in the X-axis direction relative to the second blade assembly X-axis slide (12) and is gripped by the back main shaft (80) and moves in the X-axis direction relative to the work protruding from the front end of the back main shaft (80), and the second blade assembly inclined Y-axis slide (13) moves in the inclined Y-axis direction relative to the second blade assembly X-axis slide (12) and is gripped by the back main shaft (80) and moves in the inclined Y-axis direction relative to the back main shaft (80).

[0026] In addition, by combining movement in the inclined Y-axis direction by the second blade plate inclined Y-axis slide (13) and movement in the X-axis direction by the second blade plate X-axis slide (12), the second turret blade plate (90) can be moved as if it were moving in the Y-axis direction.

[0027] FIG. 2 is a cross-sectional view along the Z-axis of the first turret blade assembly (30), and FIG. 3 is a front view of the first turret blade assembly (30) seen from the front and rear in the Z-axis direction of the first turret blade assembly (30).

[0028] The first turret blade assembly (30) is provided with a main body (35), a turret (31), and an extension (39), as shown in FIG. 2. The main body (35), the turret (31), and the extension (39) are arranged in this order toward the front along the Z-axis direction.

[0029] The main body (35) is provided with a rotation axis (36a) extending in the Z-axis direction and a pivot axis (36b) coaxial with the rotation axis (36a). Both the rotation axis (36a) and the pivot axis (36b) are rotatable around the axis. The rotation axis (36a) and the pivot axis (36b) rotate independently of each other.

[0030] The rotation axis (36a) rotates around the Z-axis, thereby rotating a rotating tool, such as a drill bit attached to the turret (31), around the axis of the rotating tool.

[0031] The pivot axis (36b) is formed in a tubular shape positioned radially outward from the rotation axis (36a). By rotating the pivot axis (36b) around the axis, the turret (31) pivots around the Z-axis relative to the main body (35).

[0032] As shown in FIG. 2 and 3, the turret (31) is formed in the shape of a prism when viewed from the front in the Z-axis direction. The turret (31) is attached to the main body (35) so as to be rotatable by rotating the pivot axis (36b) around the Z-axis while the axis of the prism follows the Z-axis.

[0033] An extension (39) protruding in the Z-axis direction from the front end (31z) is fixed to the front end (31z) located at the front end (31z) in the Z-axis direction, which is orthogonal to the pivot axis (36b) of the turret (31). The extension (39) rotates integrally with the turret (31) around the pivot axis (36b). A pivoting motor (38), which is a power source for pivoting the rotary tool unit (40) described later, is installed inside the extension (39).

[0034] The turret (31) has a circumferential surface around the axis of the prism divided into 10 flat turret surfaces (31n, 31c, 31d, 31e, 31f, 31g, 31h, 31i, 31j, 31k). The turret surfaces (31c to 31k) have the same length along the circumferential direction and the same dimensions from the pivot center (Z-axis) of the turret (31).

[0035] Meanwhile, the turret surface (31n) has a longer circumferential dimension compared to the other turret surfaces (31c~31k), and also has a shorter dimension from the pivot center (Z-axis) of the turret (31).

[0036] Here, the other nine turret surfaces (31c to 31k) and the other one turret surface (31n) are described in detail. In general, all turret surfaces are set to have the same dimensions along the circumferential direction and from the center of rotation so that the weight balance around the swivel axis is even. That is, a typical turret is formed in the shape of a regular polygonal prism.

[0037] The turret (31) of this embodiment also has a basic structure formed in the shape of a regular dodecagonal prism, together with nine other turret surfaces (31c~31k), when three virtual turret surfaces (31a, 31b, 31m) shown by a two-dot dashed line in FIG. 3 are formed instead of a turret surface (31n).

[0038] The three virtual turret surfaces (31a, 31b, 31m) have the same length along the circumferential direction as the other nine turret surfaces (31c~31k), and also have the same dimensions from the pivot center (Z-axis) of the turret (31).

[0039] That is, the turret (31) of the present embodiment forms a single flat turret surface (31n) instead of the three turret surfaces (31m, 31a, 31b) formed between the turret surface (31k) and the turret surface (31c) in a typical turret with a virtual regular dodecagonal prism shape.

[0040] Accordingly, the turret (31) of the present embodiment can be described as having three turret surfaces (31m, 31a, 31b) that are continuous in the circumferential direction of the prism, which are cut by a single plane, and the cut plane formed as a single turret surface (31n), based on a general turret in the shape of a regular dodecagonal prism.

[0041] However, the turret (31) of the present embodiment is merely a shape assumed to have been cut from an outer shape based on a regular dodecagonal prism shape, and in reality, a turret in the shape of a regular dodecagonal prism is not formed and then a processing step is performed to cut off a part of the regular dodecagon to form a decagonal prism shape. Additionally, a turret in the shape of a regular dodecagonal prism is formed and then a processing step is performed to cut off a part of the regular dodecagon to form a decagonal prism shape.

[0042] Among the 10 turret surfaces (31n, 31c to 31k), tool holders (61, 62, 63, 64, 65) are attached to 9 turret surfaces (31c to 31k) to mount tools such as cutting bits, indicated by a dotted line. Additionally, tools other than cutting tools may be attached.

[0043] The first turret blade assembly (30) moves in the X-axis direction by the first blade assembly X-axis slide (15), moves the first blade assembly Y-axis slide (16) in the Y-axis direction, moves the first blade assembly Z-axis slide (17) in the Z-axis direction, and the turret (31) rotates around the pivot axis (36b) so that at the selected pivot position, a tool attached to the turret surface comes into contact with a workpiece (W) that is rotated while held on the front main axis (20), thereby causing the tool to process the workpiece (W).

[0044] Here, an extension (39) protruding from the front end surface (31z) of the turret (31) in the direction of the front main axis (20) in the Z-axis direction has an extended turret surface (39a) formed therein that follows the turret surface (31n). The extended turret surface (39a) is formed in the same plane as the turret surface (31n) and is located on the surface of the extension (39), just as the turret surface (31n) is extended on the side of the front main axis (20) in the Z-axis direction of the turret (31).

[0045] And, a rotary tool unit (40) is attached across the turret surface (31n) and the extension turret surface (39a). That is, the rotary tool unit (40) is attached at a position offset toward the front surface (31z) of the turret compared to the tool attached to the other turret surface. The rotary tool unit (40) can pivot around an axis B that is orthogonal to the turret surface (31n) and the extension turret surface (39a). Here, axis B is an axis parallel to the Y-axis.

[0046] The rotary tool unit (40) rotates around axis B by means of a pivoting motor (38) installed inside the extension (39), thereby rotating a rotating member (37b) installed within the same extension (39) around axis B. That is, the rotary tool unit (40) is a so-called B-axis pivoting tool unit.

[0047] And, the rotary tool unit (40) is always connected to the rotary shaft (36a) and the rotary shaft (37a) installed within the extension (39), and also rotates the rotary tool (42) around the axis (C0) of the rotary tool (42) through a transmission mechanism (41) that is always connected to the rotary shaft (37a).

[0048] Accordingly, the rotary tool unit (40) can perform machining by so-called B-axis rotation on a workpiece (W) held on the front main spindle (20) or the rear main spindle (80).

[0049] The automatic lathe (100) configured as described above has a rotating tool unit (40) that rotates along the B-axis attached to a turret surface (31n) and an extended turret surface (39a), the dimensions (distance) from the Z-axis, which is the center of rotation of the turret (31), set shorter than other turret surfaces (31c~31k). Accordingly, the turret surface (31n) is formed with a longer circumferential dimension of the turret (31) compared to other turret surfaces (31c~31k).

[0050] Accordingly, the rotary tool unit (40) installed on the turret surface (31n) (and the extended turret surface (39a)) can secure a longer distance from the tool installed on the adjacent turret surface compared to the one installed on the other turret surfaces (31c to 31k).

[0051] That is, as illustrated in FIG. 3, when a rotary tool unit (40) is installed on a turret surface (31n), the turret surface (31c, 31k) is adjacent to the turret surface (31n). Meanwhile, when the rotary tool unit (40) is installed on, for example, another turret surface (31e), the turret surface (31d, 31f) is adjacent to this turret surface.

[0052] And, the distance between the rotary tool unit (40) installed on the turret surface (31n) and the tool (61, 65) installed on the adjacent turret surface (31c, 31k) is clearly longer than the distance between the rotary tool unit (40) installed on the turret surface (31e) and the tool (62) installed on the adjacent turret surface (31d, 31f).

[0053] Accordingly, according to the automatic lathe (100) of the present embodiment, a sufficient gap can be secured between the rotary tool unit (40) installed on the turret surface (31n) (and extended turret surface (39a)) and the tool (61, 65) installed on the adjacent turret surface (31c, 31k), and there is no need to limit the rotation range of the rotary tool unit (40).

[0054] Additionally, the automatic lathe (100) has a partitioned processing chamber to limit the scattering range of chips generated by processing the workpiece (W) with a rotary tool (42), and also to limit the scattering range of coolant liquid sprayed for purposes such as cooling the heat generated by cutting the workpiece (W) and the rotary tool (42), or reducing friction between the workpiece (W) and the rotary tool (42).

[0055] FIG. 4 is a schematic plan view showing a space partitioned as a processing room that includes parts of the front main shaft (20), the first turret blade assembly (30), the rear main shaft (80), and the second turret blade assembly (90), and shows the first turret blade assembly (30) being far from the front main shaft (20).

[0056] FIG. 5 is a schematic plan view showing a space divided into a processing room that includes parts of the front main shaft (20), the first turret blade assembly (30), the rear main shaft (80), and the second turret blade assembly (90), and shows the state where the first turret blade assembly (30) is close to the front main shaft (20).

[0057] For example, as shown in FIG. 4, a workpiece (W) held on a front main shaft (20), an extension (39) to which a rotary tool unit (40) is attached, and a turret (31) are placed inside a partitioned processing room.

[0058] In a configuration that limits the scattering range of chips or coolant liquid as much as possible, a partition plate (51, 52) that partitions the processing room is positioned immediately after the turret (31) in the Z-axis direction (in the case where the front main shaft (20) side is facing forward, at a position right next to the turret (31) in the rear of the turret (31).

[0059] As in the conventional method, if a rotary tool unit (40) is installed on the normal turret surface (31c~31k) of the turret (31), the rotary tool unit (40) may interfere with the partition plate (51), etc. when the rotary tool unit (40) rotates on the B-axis.

[0060] However, in the automatic lathe (100) of the present embodiment, since the rotary tool unit (40) is installed in a position spanning the turret surface (31n) and the extended turret surface (39a), it is positioned offset (offset) toward the front main shaft (20) side (front end surface (31z) side) in the Z-axis direction compared to the case where it is installed only on the turret surface (31n).

[0061] As a result, the distance (dimension along the Z-axis direction) between the rotary tool unit (40) and the partition plate (51) located at the rear of the turret (31) can be significantly increased compared to that installed on the normal turret surface (31c to 31k).

[0062] Accordingly, according to the automatic lathe (100) of the present embodiment, a sufficient gap can be secured between the rotary tool unit (40) installed on the turret surface (31n) and the other turret surface (31c~31k) and the partition plate (51, 52), and there is no need to limit the rotation range of the rotary tool unit (40).

[0063] Since the first turret blade assembly (30) is movable in the X-axis direction, the partition plates (51, 52) connected to the first turret blade assembly (30) along the X-axis direction are configured to extend and retract according to the movement of the first turret blade assembly (30) in the X-axis direction.

[0064] That is, in FIG. 4, the partition plate (52) positioned above the X-axis direction of the first turret blade assembly (30) is arranged in a superimposed and reduced state with partition plate pieces (52a, 52b) divided into two pieces in the X-axis direction, and the partition plate (51) positioned below the X-axis direction of the first turret blade assembly (30) is arranged in a state where partition plate pieces (51a, 51b, 51c) divided into three pieces in the X-axis direction are arranged in an extended state with their positions in the X-axis direction offset from each other.

[0065] And, as shown in FIG. 5, when the first turret blade assembly (30) moves downward in the X-axis direction, the two partition plates (52a, 52b) positioned on the upper side in the X-axis direction are misaligned in the X-axis direction and their lengths on the upper side in the X-axis direction are extended, thereby securing a partitioned state by the partition plate (52).

[0066] Meanwhile, three partition plates (51a, 51b, 51c) arranged on the lower side of the city in the X-axis direction overlap each other, and the length on the lower side in the X-axis direction is reduced, thereby securing a partitioned state by the partition plate (52).

[0067] In the automatic lathe (100) of the present embodiment, the first turret blade assembly (30) has been described mainly in relation to the work (W) held on the front main spindle (20) or the work (W) held on the rear main spindle (80), but the second turret blade assembly (90) for processing the work (W) held on the rear main spindle (80) or the work (W) held on the front main spindle (20) may also be configured in the same way as the first turret blade assembly (30).

[0068] In the automatic lathe (100) of the present embodiment, the rotary tool unit (40) rotating on the B-axis may not be installed across the turret surface (31n) and the extended turret surface (39a), and the rotary tool unit (40) may be installed only on the extended turret surface (39a) without being attached to the turret surface (31n), or may be installed only on the turret surface (31n).

[0069] That is, the automatic lathe (100) may have a rotating tool unit (40) that rotates along the B-axis attached to at least a turret surface (31n) (or an extended turret surface (39a)) which is set shorter than other turret surfaces (31c~31k) in terms of the dimension (distance) from the Z-axis, which is the center of rotation of the turret (31).

[0070] Additionally, in the case where the rotary tool unit (40) is installed only on the turret surface (31n), the pivot center (axis B) of the rotary tool unit (40) may be the same as the attachment position of the tool attached to the other turret surfaces (31c~31k), but it is preferable that it be closer to the front main axis (20) in the Z-axis direction than the attachment position of the tool attached to the other turret surfaces (31c~31k).

[0071] FIG. 6 is a schematic diagram showing the machinable range that can be machined by a rotary tool (42) when the turret (31) is in a normal position (P1) (corresponding to a selected pivot position), when it is in an upper position (P2) (corresponding to a position different from the selected pivot position), and when it is in a lower position (P3) (corresponding to a position different from the selected pivot position).

[0072] As illustrated in FIG. 6, when the automatic lathe (100) of the present embodiment performs machining of a workpiece with a rotary tool (42) of a rotary tool unit (40), the machining range that the rotary tool (42) reaches by moving the first blade head X-axis slide (15) and the first blade head Y-axis slide (16) in the normal position (P1) is the range S1 shown by the solid line.

[0073] Meanwhile, the machinable range that the rotary tool (42) reaches by moving the first blade head X-axis slide (15) and the first blade head Y-axis slide (16) in the upper position (P2) where the turret (31) is rotated upward is the range S2 shown by the dashed line, and the machinable range that the rotary tool (42) reaches by moving the first blade head X-axis slide (15) and the first blade head Y-axis slide (16) in the lower position (P3) where the turret (31) is rotated downward is the range S3 shown by the two-dot dashed line.

[0074] Accordingly, according to the automatic lathe (100) of the present embodiment, if the rotary tool (42) can be rotated in an upper position (P2) or a lower position (P3) other than the normal position (P1) of the turret (31), the machinable range can be expanded from range S1 to range S2 to S1 to S3.

[0075] In order to rotate the rotary tool (42) in the upper position (P2) or lower position (P3), in addition to the state where the turret surface (31n) is positioned at the lowest surface (lowest surface in the Y-axis direction) of the turret (31), it is preferable that the rotation axis (36a) and the rotation axis (37a) are always connected.

[0076] In addition, in the upper position (P2) or lower position (P3), the tilt of the rotary tool (42) relative to the workpiece is different compared to when the workpiece is processed in the range (S1) in the normal position (P1). However, the control unit of the automatic lathe (100) rotates the front main spindle (20) in response to the tilt of the rotary tool (42) (to offset the tilt) and adjusts the phase of the workpiece relative to the rotary tool (42), thereby eliminating the tilt of the rotary tool (42) relative to the workpiece, so that the workpiece can be processed as if it were being processed in the normal position (P1).

[0077] By rotating the turret (31) to the upper position (P2) or lower position (P3), it becomes possible to make the distance between the workpiece (W) and the tip of the rotary tool (42) greater than the distance in the normal position (P1), thereby allowing the use of a rotary tool (42) having a long dimension along the C0 axis direction. By using a rotary tool (42) with a long dimension along the C0 axis direction, a hole can be drilled that penetrates the workpiece (W) in the diameter direction.

[0078] The machine tool according to the present invention is not limited to automatic lathes. Furthermore, in the machine tool according to the present invention, the tool attached to the turret surface, which is set to have a dimension from the pivot center of the turret shorter than other turret surfaces, does not have to be a rotary tool unit that pivots along the B-axis.

[0079] In addition, the machine tool according to the present invention is not limited to one turret face, in which the dimension from the pivot center of the turret is set shorter than other turret faces, but may have two or three. The machine tool according to the present invention is not limited to having 10 turret faces.

[0080] Although embodiments of the present invention have been described in detail with reference to the drawings, the embodiments are merely examples of the present invention, and the present invention is not limited to the embodiments described above.

[0081] [Cross-reference of related applications]

[0082] This application claims priority based on Japanese Patent Application 2020-139161 filed with the Patent Office of Japan on August 20, 2020, all of which are fully incorporated by reference herein.

Claims

Claim 1 A machine tool comprising a main spindle that holds a workpiece, a turret having a circumferential surface around a pivot axis and a cross-section perpendicular to the pivot axis, wherein the circumferential surface is divided into a plurality of attachment surfaces, and a tool is mounted on the plurality of attachment surfaces and rotates around the pivot axis to perform machining on the workpiece by one of the tools at a selected pivot position, wherein at least one of the attachment surfaces of the turret is provided with a wider gap with a tool installed on an adjacent turret surface compared to the other attachment surfaces, and the distance from the pivot axis is set to be shorter. Claim 2 In claim 1, the tool attached to the attachment surface, which is set to have a shorter distance from the pivot axis compared to the other attachment surface, is a machine tool attached at a position offset to the cross-sectional side compared to the tool attached to the other attachment surface. Claim 3 A machine tool according to claim 1 or 2, wherein the tool attached to the attachment surface, which is set to be shorter from the pivot axis than the other attachment surface, is a rotary tool that pivots around an axis perpendicular to the attachment surface. Claim 4 A machine tool according to paragraph 3, wherein the turret is movable within a plane orthogonal to the axial direction of the main shaft, and the rotary tool attached to the attachment surface, which is set to be shorter from the pivot axis than the other attachment surface, is set to be rotatable in a state where the turret is pivoted to a position different from the pivot position, and the main shaft is rotated to adjust the phase of the workpiece in response to the tilt of the rotary tool in the pivoted state of the turret. Claim 5 delete

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