JP7540626B2 - Work machine with position correction function - Google Patents

Description

The present invention relates to a working machine with a position correction function that supports a tool for internal diameter machining and is equipped with a tool cartridge that is attached to a boring bar so that the position can be corrected.

In general, various machine tools are used to process a workpiece via a tool, such as a machining tool, attached to a tool holder. In this case, the machine tool is usually incorporated into a working machine having a function and mechanism that works in conjunction with the operation of the machine tool.

For example, in the boring process of the cylinder bore constituting the engine block, multiple processes such as a rough process, a semi-finishing process, and a finishing process are performed. In the finishing process (fine boring), in order to improve the shape accuracy and surface condition of the cylinder bore, it is necessary to process the inner cylinder diameter dimension with high precision on the order of microns. However, when mass production processing is performed, the cutting edge of the boring tool wears as the processing work progresses. Therefore, in order to maintain the machining diameter tolerance in microns, a function is required that can correct the position of the cutting edge of the boring tool in the radial direction in microns (diameter enlargement side). For example, Patent Document 1 discloses a boring tool assembly that provides a tool cartridge with a larger adjustment range of the machining diameter.

In a boring machine having this type of correction function, as shown in Fig. 13, a recess 2 is formed at the tip of a boring bar 1, and a tool cartridge 3 is attached to the recess 2 via a fixing bolt 4. A cutting tool (machining tip) 5 for internal diameter machining is provided at the tip of the tool cartridge 3, and an adjustment bolt 6 for adjusting the machining diameter is screwed in the rear vicinity of the cutting tool 5. An adjustment bolt 7 for adjusting the position of the tool cartridge 3 in the machining axis direction (arrow L direction) is provided at the rear end of the tool cartridge 3. The adjustment bolt 7 is used to adjust the position of each cutting edge when a multi-blade structure is adopted, for example.

In this configuration, when the adjustment bolt 6 is turned in the screwing direction by a wrench (not shown) or the like, the tip of the adjustment bolt 6 presses against the mounting surface 1f, which is the inner surface of the recess of the boring bar 1. The rear end side of the tool cartridge 3 is firmly fixed to the boring bar 1 by the fixing bolt 4, and the tip side where the cutting tool 5 is provided elastically deforms in the diameter expanding direction (the direction of the arrow Ru in FIG. 13). Therefore, the cutting tool 5 adjusts the cutting edge in micron units and corrects the machining diameter in response to the cutting edge wear.

JP 2001-205506 A

In the above-mentioned tool cartridge 3, as shown in Fig. 14, a gap t is formed between the cartridge lower surface 3u at the tip and the mounting surface 1f of the boring bar 1, and they are not in contact with each other. On the other hand, the side surface 3s of the tool cartridge 3 and the side surface 1s of the boring bar 1 are in partial contact with each other at their most protruding portions.

For this reason, when the internal diameter of the workpiece is machined by the cutting tool 5 under the rotating action of the boring bar 1, the force in the thrust direction of the cutting resistance applied to the cutting tool 5 is applied to the mounting surface 1f of the boring bar 1 through the adjustment bolt 6. In other words, the thrust force of the cutting resistance is substantially received at a point by the tip of the adjustment bolt 6. On the other hand, the force in the principal component direction of the cutting resistance is received at the most protruding point between the side surface 3s of the side surface of the tool cartridge 3 and the side surface 1s of the boring bar 1.

When boring is performed in this state, strong and weak cutting resistance acts on the tool cartridge 3 due to changes in the machining allowance and the machined surface, or the relationship between the machining part of the cutting tool 5 and the flow of cutting powder. At that time, although the rear end of the tool cartridge 3 is firmly fixed to the boring bar 1 by the fixing bolt 4, the tip of the tool cartridge 3 is in an elastically deformed state, and an excitation force is generated by the machining force. When this excitation force is applied to the tip of the tool cartridge 3, the tool cartridge 3 vibrates finely while elastically deforming, and vibrates in the direction of arrow A (see FIG. 14) against the cutting main component force and in the direction of arrow B (see FIG. 14) against the cutting thrust force.

At that time, the tool cartridge 3 vibrates with its own natural frequency characteristic in the direction of the arrow A and its own natural frequency characteristic in the direction of the arrow B. Generally, both frequencies are high, on the order of several thousand Hz, and this high frequency (vibration frequency) acts to strike the cutting edge of the cutting tool 5, accelerating damage to the cutting edge. In particular, in the above-mentioned Patent Document 1, there is no strong bolt connection surface, and there is a risk of additional vibration force being generated at the tip of the cartridge.

The present invention is devised to solve this type of problem, and aims to provide a work machine with a position correction function that has a simple configuration, is capable of effectively suppressing tool vibration, and minimizing damage to the tool tip.

The working machine with position correction function according to the present invention includes a boring bar, a tool cartridge that supports an internal diameter machining tool so that the position of the tool can be corrected in the machining diameter direction and is attached to the boring bar, and a flat spring member that has a flat plate shape and is provided with an elastic deformation portion that curves or bends along the way. A hole portion is formed in the outer periphery of the boring bar so as to intersect with the rotation axis direction of the boring bar, and a recess portion is formed in the tip portion of the tool cartridge so as to be approximately parallel to the hole portion. One end of the flat spring member is inserted into the hole portion, while the other end of the flat spring member is inserted into the recess portion.

In the work machine with position correction function according to the present invention, a flat spring member is inserted into a recess provided at the tip of the tool cartridge and elastically presses the tip inward in the machining diameter direction. Moreover, the flat spring member generates a frictional force between the tip of the tool cartridge and the flat spring member against vibrations in the machining direction of the tool. Therefore, a strong frictional force is generated at the contact portion between the tool cartridge and the flat spring member, generating a high damping force. Moreover, the natural vibration characteristics of the tool cartridge and the natural vibration characteristics of the flat spring member interact with each other to generate new and good damping characteristics. Therefore, it is possible to effectively suppress the vibrations of the tool and reduce damage to the tool tip as much as possible.

1 is a perspective explanatory view of a machine tool constituting a working machine with a position correction function according to a first embodiment of the present invention; FIG. 2 is a cross-sectional explanatory view of a main part of the machine tool. FIG. 2 is an explanatory diagram of the tip side of a boring bar that constitutes the machine tool. FIG. 2 is a sectional front view of the tip side of the boring bar. FIG. 2 is an exploded perspective view of the boring bar, the tool cartridge, and the flat spring member. FIG. 4 illustrates a natural vibration spectrum of the tool cartridge. FIG. 13 is a diagram showing a natural vibration spectrum of a flat spring member. FIG. 13 is a diagram showing a natural vibration spectrum when the flat spring member and the tool cartridge are engaged with each other. FIG. 11 is a sectional front view of a main part of a boring bar constituting a working machine with a position correction function according to a second embodiment of the present invention. FIG. 11 is an explanatory view of the tip side of the boring bar, showing a fixed state by another fixing bolt. FIG. 13 is an explanatory cross-sectional view of the tip side of the boring bar, showing the fixed state by the another fixing bolt. FIG. 13 is a sectional front view of a main part of a boring bar constituting a working machine with a position correction function according to a third embodiment of the present invention. FIG. 1 is an explanatory diagram of a boring bar constituting a conventional boring processing device. FIG. 2 is an explanatory diagram of cutting resistance caused by the conventional boring bar.

As shown in Fig. 1, a machine tool 10, which is a working machine with a position correction function according to a first embodiment of the present invention, includes a main body 12, and a spindle housing 14 is attached to the main body 12 so as to be slidable in the X-, Y-, and Z-axis directions. As shown in Fig. 2, a spindle 16 is rotatably provided in the spindle housing 14 via a bearing 18, and a boring bar 20 is detachably attached to the spindle 16. Note that the boring bar 20 is attached to the machine tool 10, which is a machining center, but is not limited to this and may be used in a dedicated machine (not shown).

The boring bar 20 has a shank portion 22 connected to the spindle 16, and a boring bar body 24 is integrally provided with the shank portion 22. A tool cartridge 26 is attached to the outer periphery of the tip side of the boring bar body 24, which is opposite to the shank portion 22 side (spindle 16 side).

On the outer periphery of the tip side of the boring bar body 24, there are provided a first wall surface 28a formed in a machining radial direction (arrow R direction) intersecting the rotational axis direction (machining axis direction) (arrow L direction) of the boring bar 20, a second wall surface 28b formed in a machining direction intersecting the rotational axis direction and the machining radial direction, and a third wall surface 28c constituting the bottom surfaces of the first wall surface 28a and the second wall surface 28b.

As shown in Figures 3 to 5, the outer periphery of the tip side of the boring bar body 24 is provided with a first outer wall surface 30a on the back side of the first wall surface 28a, a second outer wall surface 30b connected to the first outer wall surface 30a via a step, and a third outer wall surface 30c substantially perpendicular to the second outer wall surface 30b. The outer periphery of the tip side of the boring bar body 24 is provided with a first square hole (hole portion) 32a having a rectangular cross section, which crosses the rotation axis direction of the boring bar 20, i.e., extends in the machining direction (arrow S direction in Figure 4), and penetrates the first outer wall surface 30a. The outer periphery of the tip side of the boring bar body 24 is provided with a second square hole (hole portion) 32b having a rectangular cross section, which is parallel to the first square hole 32a and penetrates the second outer wall surface 30b. The first rectangular hole 32a and the second rectangular hole 32b may have various cross-sectional shapes as long as they correspond to the cross-sectional shape of the flat spring member 46 described later. The second rectangular hole 32b does not have to be a through hole.

A first bolt hole 34a that intersects with and communicates with the second rectangular hole 32b, and a second bolt hole 34b located to the rear of the first bolt hole 34a are formed in the second wall surface 28b of the boring bar body 24. A first fixing bolt 36a is screwed into the first bolt hole 34a, while a tip end of a second fixing bolt 36b is screwed into the second bolt hole 34b.

The tool cartridge 26 has a generally rectangular columnar shape, and a cutting tool (tool) 38 for internal diameter machining is fixed (supported) at the tip end side by various fixing structures such as a screw or a clamp piece. An adjustment bolt 40 that adjusts the position of the cutting tool 38 attached to the tool cartridge 26 in the machining axis direction is engaged with the rear end surface of the tool cartridge 26. A bolt insertion hole 42 is formed at the rear end side of the tool cartridge 26. The tip of a second fixing bolt 36b inserted into the bolt insertion hole 42 screws into a second bolt hole 34b formed in a second wall surface 28b of the boring bar main body 24, and the tool cartridge 26 is fixed to the boring bar main body 24.

A square hole (recess) 44 is formed in the side surface of the tip end of the tool cartridge 26, communicating with the first square hole 32a of the boring bar body 24. The square hole 44 may be a through hole as necessary. For example, a hexagonal socket adjustment bolt 45 is screwed into the tip end of the tool cartridge 26, and the tip of the adjustment bolt 45 abuts against the second wall surface 28b of the boring bar body 24.

A flat spring member 46 is attached to the boring bar body 24 and the tool cartridge 26. As shown in Figs. 4 and 5, the flat spring member 46 is a strong spring made of alloy steel such as spring steel, and has a thick and long arc shape. The flat spring member 46 has a flat shape and is provided with a first flat portion (other end) 48a and a second flat portion (one end) 48b extending parallel to each other, and an elastically deformable portion 48c that curves (or bends at multiple points) on the way. The second flat portion 48b is longer than the first flat portion 48a and is set to a size smaller than the opening size of the second rectangular hole 32b of the boring bar body 24, and is inserted and disposed in the second rectangular hole 32b as described later. The first flat portion 48a is set to a dimension smaller than the opening dimension of the first rectangular hole 32a in the boring bar body 24 and the opening dimension of the rectangular hole 44 in the tool cartridge 26, and is inserted into the first rectangular hole 32a and the rectangular hole 44, as described below (the engagement portion between the tool cartridge 26 and the flat spring member 46).

The first flat portion 48a of the flat spring member 46 is provided with a first inclined surface 50a on the inner surface facing the second flat portion 48b, the first inclined surface 50a being inclined in a direction away from the second flat portion 48b toward the tip. The second flat portion 48b of the flat spring member 46 is provided with a second inclined surface 50b on the inner surface facing the first flat portion 48a, the second inclined surface 50b being inclined in a direction away from the first flat portion 48a toward the tip. The second flat portion 48b is formed with a recess (e.g., a tapered surface) 50c with which the first fixing bolt 36a engages. The first inclined surface 50a, the second inclined surface 50b, and the recess 50c may be provided as necessary, and may be set to various shapes.

The installation work of the flat spring member 46 is performed as follows. First, in the flat spring member 46, the first flat portion 48a and the second flat portion 48b are usually slightly inclined in a direction approaching each other when no external force is applied (unloaded state). The first flat portion 48a and the second flat portion 48b may be parallel to each other in the unloaded state. In this case, it is sufficient that the first rectangular hole 32a and the second rectangular hole 32b are slightly inclined in a direction away from each other toward the spring member insertion direction.

Then, the elastically deformable portion 48c is struck by a hammer or the like in a state where the tip of the first flat portion 48a is slightly inserted into the first square hole 32a, while the tip of the second flat portion 48b is inserted into the second square hole 32b. Therefore, the first flat portion 48a is inserted into the first square hole 32a under the guiding action of the first inclined surface 50a, and is further inserted into the square hole 44 of the tool cartridge 26. At that time, one side (the inward side) of the first flat portion 48a slides in a state of being in pressure contact with the wall surface of the first square hole 32a and the wall surface of the square hole 44. On the other hand, the second flat portion 48b is inserted into the second square hole 32b under the guiding action of the second inclined surface 50b. At that time, one side (the inward side) of the second flat portion 48b slides in a state of being in pressure contact with the wall surface of the second square hole 32b.

Therefore, the flat spring member 46 is attached to the boring bar body 24 and the tool cartridge 26 with the first flat portion 48a and the second flat portion 48b being pushed apart from each other. This allows the flat spring member 46, which has a high spring stiffness, to be easily and reliably assembled. Furthermore, the tip of the first fixing bolt 36a abuts against the recess 50c of the flat spring member 46, thereby preventing the flat spring member 46 from coming off. Since the second rectangular hole 32b is a through hole, the operation of removing the flat spring member 46 can be easily performed by inserting a tool from the tip of the second flat portion 48b.

The operation of the machine tool 10 according to the first embodiment configured as above will be described below.

2, when the spindle 16 constituting the machine tool 10 is driven to rotate, the boring bar 20 rotates integrally with the spindle 16. A tool cartridge 26 is attached to the boring bar 20, and a cutting tool 38 of the tool cartridge 26 machines (machines the inner diameter) the inner peripheral surface of a workpiece (not shown) under the rotation of the boring bar 20. Next, when the cutting edge of the cutting tool 38 is worn down by the machining operation, the position of the cutting tool 38 is adjusted (corrected) outward in the machining radial direction via an adjustment bolt 45.

In this case, in the first embodiment, the flat spring member 46 is inserted in a state in which it is expanded, and is attached to the boring bar body 24 and the tool cartridge 26. Specifically, one side of the second flat portion 48b constituting the flat spring member 46 is arranged in a state of being pressed against the wall surface of the second square hole 32b formed in the boring bar body 24. Meanwhile, one side of the first flat portion 48a constituting the flat spring member 46 is arranged in a state of being pressed against the wall surface of the first square hole 32a formed in the boring bar body 24 and the wall surface of the square hole 44 formed in the tool cartridge 26. Therefore, the tip portion of the tool cartridge 26 is elastically pressed toward the inside in the machining radial direction by the strong spring rigidity of the flat spring member 46. Therefore, the vibration acting in the direction of the arrow B (machining radial direction) shown in FIG. 14 is effectively reduced.

Moreover, the flat spring member 46 generates a frictional force between itself and the tip of the tool cartridge 26 against vibration in the machining direction of the cutting tool 38 (the direction of the arrow A in FIG. 14). As a result, a strong frictional force is generated at the contact portion between the tool cartridge 26 and the flat spring member 46, generating a high damping force. The action of this damping force improves the damping characteristics of the tool cartridge 26 attached to the boring bar body 24.

Incidentally, as a method for expressing the natural vibration characteristics of the tool cartridge 26 having spring properties, a method is known in which the ratio between the input value that applies a force to the target object by impact vibration and the output value that appears when excited by the vibration force is expressed as a transfer function using a frequency spectrum. In this case, if there is even one part with a significant natural vibration characteristic, for example, a phenomenon in which a vibration peak rises steeply and high, the value of modal flexibility deteriorates, and not only high-frequency vibration of the cutting edge of the cutting tool 38 but also unstable machining states and chattering are likely to occur. On the other hand, a frequency spectrum with no significant natural frequency peak or a smooth peak will result in a relatively stable machining state.

6 is a diagram showing a spectrum obtained by measuring the natural frequency of the tool cartridge 26 without the flat spring member 46. In this spectrum, the low to medium frequency range is almost flat with no significant peak value, while a significant peak value of the natural frequency appears in the high frequency range. This deteriorates the modal flexibility value, and makes it easy for an unstable machining state and chatter to occur.

7 is a diagram showing a spectrum obtained by measuring the natural frequency of the flat spring member 46 alone. In this spectrum, a significant peak value appears in the mid-frequency range, while a gentle and high peak value appears in the high-frequency range.

In contrast, Fig. 8 is a diagram showing the spectrum of natural frequencies measured when the flat spring member 46 and the tool cartridge 26 are firmly engaged (see Figs. 3 and 4). By combining two members with significantly different natural frequency characteristics, i.e., the flat spring member 46 and the tool cartridge 26, the distinct natural frequency characteristics cancel each other out. As a result, as shown in Fig. 8, a flat spectrum characteristic is shown from the low frequency range to the high frequency range with no distinct peak values, and a stable machining state is obtained, while good characteristics that are unlikely to cause chattering or the like can be ensured.

In this way, in the first embodiment, by simply attaching the flat spring member 46 having a simple structure to the boring bar body 24 and the tool cartridge 26, it is possible to obtain the effect that a large frictional force is generated by a high contact force, and the natural vibration characteristics of both interact with each other to newly generate good damping characteristics. Therefore, with a simple configuration, it is possible to impart a good pressing frictional force to the tool cartridge 26, improve the damping characteristics, and improve the processing stability and the durability of the cutting tool 38.

9 is a sectional front view of a main part of a boring bar 100 constituting a working machine with a position correction function according to a second embodiment of the present invention. Note that the same components as those of the boring bar 20 (shown in FIG. 4) of the machine tool 10 according to the first embodiment are given the same reference numerals and detailed description thereof will be omitted.

A rectangular cross-sectional hole (hole) 32 is formed through the outer periphery of the tip end of the boring bar body 102 constituting the boring bar 100, extending in the machining direction (the direction of the arrow S in FIG. 9). A first bolt hole 106 is formed on the outer periphery of the tip end of the boring bar body 102, located on the back side of the tool cartridge 104, and intersects with the rectangular hole 32. A first fixing bolt 36a is screwed into the first bolt hole 106. A rectangular hole 44a is formed on the side opposite the rectangular hole 44 (see FIG. 4) on the tip end side of the tool cartridge 104.

The flat spring member 46 is inserted in a spread-out state, and is thereby attached to the boring bar body 102 and the tool cartridge 104. At this time, one side (the inward side) of the first flat portion 48a is placed in pressure contact with the wall surface of the square hole 44a formed in the tool cartridge 104. Meanwhile, one side (the inward side) of the second flat portion 48b is placed in pressure contact with the wall surface of the square hole 32 formed in the boring bar body 102. The flat spring member 46 is placed in an opposite position to that of the first embodiment, i.e., the elastic deformation portion 48c is placed on the cutting tool 38 side.

In this case, in the second embodiment, the flat spring member 46 is attached to the boring bar body 102 and the tool cartridge 104 in such a manner that it is pushed apart. Therefore, with a simple configuration, it is possible to impart a good pressing frictional force to the tool cartridge 104, improve the damping characteristics, and improve the processing stability and the durability of the cutting tool 38, and the same effects as those of the first embodiment described above can be obtained.

In the first and second embodiments, the second fixing bolt 36b that fixes the tool cartridge 26, 104 to the boring bar body 24, 102 applies a tightening force in a direction perpendicular to the machining direction of the cutting tool 38, but the present invention is not limited to this. As shown in Fig. 10 and Fig. 11, for example, in the boring bar 20, the tool cartridge 26 may be fixed to the boring bar body 24 via an inclined second fixing bolt 110.

The tool cartridge 26 is formed with an inclined hole portion 112 for receiving the second fixing bolt 110, and the boring bar body 24 is formed with a second bolt hole 114 coaxially communicating with the inclined hole portion 112. The second fixing bolt 110 is received in the inclined hole portion 112 and its tip portion is screwed into the second bolt hole 114, so that two mutually perpendicular surfaces 26m1 and 26m2 of the tool cartridge 26 are pressed and held against the first wall surface 28a and the second wall surface 28b of the boring bar body 24. Even with this configuration, the same effects as those of the first and second embodiments can be obtained. Note that the third embodiment described below may also be configured in a similar manner.

12 is a sectional front view of a main part of a boring bar 120 constituting a working machine with a position correction function according to a third embodiment of the present invention. Note that the same components as those in the boring bar 110 (shown in FIG. 9) according to the second embodiment are given the same reference numerals and detailed description thereof will be omitted.

The tool cartridge 104 is attached to the outer periphery of the tip side of the boring bar body 122 constituting the boring bar 120. The boring bar body 122 is provided with a side surface 122s that is substantially flush with the side surface 104s of the tool cartridge 104 on the cutting tool 38 side, and a square hole (hole portion) 124 is formed in the side surface 122s. The square hole 124 is set to a depth substantially the same as the square hole 44a of the tool cartridge 104.

A flat spring member 126 is attached to the boring bar body 122 and the tool cartridge 104. The flat spring member 126 is a strong spring made of alloy steel such as spring steel, and has a U-shape or C-shape with a thick and arc-shaped elastic portion. The flat spring member 126 has a flat shape and is provided with a first flat portion (other end) 128a and a second flat portion (one end) 128b that extend parallel to each other and have approximately the same length, and an elastic deformation portion 128c that curves (or bends at multiple points) midway.

The second flat portion 128b has an engaging protrusion 130 protruding toward the first flat portion 128a on an inner surface facing the first flat portion 128a. The flat spring member 126 is attached to the tool cartridge 104 and the boring bar body 122 in a pushed-out state. Specifically, one side of the first flat portion 128a is arranged in a state of being pressed against the wall surface of the square hole 44a formed in the tool cartridge 104. Meanwhile, one side of the second flat portion 128b is arranged in a state of being pressed against the wall surface of the square hole 124 formed in the boring bar body 122. The engaging protrusion 130 abuts against the inner surface of the square hole 124 of the boring bar body 122 and has a function of preventing the flat spring member 126 from coming off.

In this case, in the third embodiment, the flat spring member 126 is attached to the boring bar body 122 and the tool cartridge 104 in such a manner that it is pushed apart. Therefore, with a simple configuration, it is possible to impart a good pressing frictional force to the tool cartridge 104, improve the damping characteristics, and improve the processing stability and the durability of the cutting tool 38, and the like, and thus obtain the same effects as those of the first and second embodiments.

10...machine tool 14...main shaft housing 16...spindle 20, 100, 120...boring bar 24, 102, 122...boring bar body 26, 104...tool cartridge 28a-28c...wall surface 32, 32a, 32b...square hole 36a, 36b, 110...fixing bolt 38...cutting tool 44, 44a, 124...square hole 45...adjusting bolt 46, 126...flat spring member 48a, 48b, 128a, 128b...flat portion 48c, 128c...elastic deformation portion 50a, 50b...inclined surface 50c...recess 130...engaging protrusion

Claims (8)

A boring bar and
a tool cartridge that supports an internal diameter machining tool so as to be capable of correcting a position of the tool in a machining radial direction and is attached to the boring bar;
A flat spring member having a flat plate shape and an elastic deformation portion that is curved or bent in the middle;
Equipped with
a hole is formed in an outer periphery of the boring bar so as to intersect with a direction of a rotation axis of the boring bar;
A recess is formed in a tip portion of the tool cartridge so as to be substantially parallel to the hole,
A work machine with a position correction function, characterized in that one end of the flat spring member is inserted into the hole portion, while the other end of the flat spring member is inserted into the recess portion. 2. A work machine with a position correction function according to claim 1, wherein said flat spring member is curved or bent in a substantially U-shape from said one end toward said other end. 2. The working machine according to claim 1, wherein the tool cartridge and the flat spring member have different natural frequency characteristics,
The tool cartridge and the flat spring member are provided with engagement portions that cancel out the characteristics of the respective natural frequencies by engaging with each other. 3. The working machine according to claim 2, wherein the one end of the flat spring member is provided on an inner surface facing the other end with a first inclined surface inclined in a direction away from the other end toward a tip thereof;
The other end of the flat spring member has an inner surface facing the one end, the inner surface being provided with a second inclined surface inclined in a direction away from the one end toward a tip thereof,
The flat spring member is attached to the boring bar and the tool cartridge in a state where the flat spring member is pressurized in a direction separating the one end and the other end from each other. 3. The working machine according to claim 2, wherein the one end of the flat spring member is provided with a locking protrusion on an inner surface facing the other end, the locking protrusion protruding toward the other end,
The flat spring member is attached to the boring bar and the tool cartridge in a state where the flat spring member is pressurized in a direction separating the one end and the other end from each other. 2. The working machine with position correction function according to claim 1, wherein a fixing bolt is screwed into said boring bar for holding said one end inserted into said hole. 7. A working machine with a position correction function according to claim 6, wherein said one end of said flat spring member is formed with a recess into which said fixing bolt engages. 3. A work machine with a position correction function according to claim 2, wherein the boring bar has a hole into which the other end of the flat spring member is inserted substantially parallel to the hole.

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