JP7345352B2 - tool holder - Google Patents

Description

The present disclosure relates to a tool holder that is fixed to a tool moving part of a lathe and holds a cutting tool.

In general lathe processing, a workpiece is cut by moving a cutting tool in a direction parallel to the rotational axis of the workpiece (hereinafter referred to as the "Z direction"). On the other hand, in recent years, technological development of "skiving processing" in which a workpiece is cut by moving a cutting tool in a direction perpendicular to the rotational axis of the workpiece (hereinafter referred to as "Y direction") has been progressing. In addition, a cutting tool for skiving processing is held in a tool holder with blade lines extending in planes parallel to the Z and Y directions inclined with respect to the Y direction (for example, see Patent Document 1). ).

JP 2019-14037 (Paragraph [0010], Figure 1)

By the way, in order to improve the machining accuracy of skiving machining, machining of continuous workpieces with the same diameter can be performed in the Y direction and the X direction (orthogonal to the Z direction and the Y direction) without moving the cutting tool in the Z direction. It is preferable to move only in the direction of However, if there is an interference part with a larger diameter than the part to be machined next to the part to be machined, machining cannot be performed if the blade line is too long. On the other hand, if the blade line is too short, the amount of movement of the cutting tool in the Z direction will increase, reducing machining accuracy. In addition, if a large number of cutting tools with different lengths of blades are arranged so that the entire blades exactly face each other in the Y direction for each of a plurality of workpieces with different axial lengths, the cost will increase. Therefore, there is a need to develop technology to solve these problems.

The invention according to claim 1, which has been made to solve the above problem, is a tool holder that is fixed to a tool moving part of a lathe and holds a cutting tool, the head part to which the cutting tool is fixed being connected to a support shaft. a movable base provided at one end and in which the blade line of the cutting tool and the axial direction of the support shaft are perpendicular to each other; a support base having a support hole into which the support shaft is rotatably fitted; a chuck mechanism for tightening and fixing the support shaft at any rotational position within the support hole; a fitting cylinder that is fitted into the fitting cylinder, a liquid storage chamber formed inside the fitting cylinder and filled with liquid, and a communicating screw hole formed in the fitting cylinder and communicating with the liquid storage chamber. an adjustment screw that is screwed into the communicating screw hole; and an operation port that is formed on the support base and allows the adjustment screw to face outside, and the liquid storage chamber is opened by the screwing operation of the adjustment screw. In the tool holder, the fitting cylindrical body expands inwardly and outwardly as internal pressure is increased, and the fitting cylindrical body is frictionally fixed to the support hole and the support shaft.

In the invention of claim 2 , the support hole is provided with a small inner diameter part and a large inner diameter part so that the diameter of the head part side is reduced, and a small outer diameter part and a large outer diameter part that fit therein are provided. 2. The tool holder according to claim 1 , wherein an opening of the support hole on the large inner diameter side, which is formed in the fitting cylinder, is closed by the tool moving section.

The invention according to claim 3 includes an elastic fitting member that is fitted into the large inner diameter part together with the large outer diameter part and is elastically deformed when the support base is fixed to the tool moving part. This is a tool holder.

The invention according to claim 4 provides a scale provided on one of the head portion and the support base and arranged in an arc shape centered on the support hole, and a scale provided on the other of the head portion and the support base and arranged on the movable base. 4. The tool holder according to claim 1, further comprising an instruction mark that can be superimposed on any of the scales depending on the rotational position of the tool holder.

The invention according to claim 5 is the tool holder according to any one of claims 1 to 4 , wherein the support base has a tapered portion that tapers upward.

In the tool holder of the first aspect, the movable base to which the cutting tool is fixed is rotatably supported and fixed at an arbitrary rotational position by the chuck mechanism. Then, the rotational position of the movable base is adjusted and fixed so that the entire blade line of the cutting tool is exactly facing each other in the direction orthogonal to the rotational axis of the workpiece for each of the workpieces with various shaft lengths. be able to. This makes it possible to skive workpieces with various axial lengths with high precision without incurring any cost.

Further, the chuck mechanism of the tool holder includes a fitting cylinder fitted between the inner surface of the support hole and the outer surface of the support shaft, and has a liquid storage chamber therein. Then, by screwing the adjustment screw, the internal pressure of the liquid storage chamber is changed to inflate the fitting cylinder inward and outward, thereby fixing the support shaft.

In the tool holder of the second aspect, the tool moving part to which the support base is fixed is also used as a lid that prevents the fitting cylinder from slipping out into the support hole, so that the number of parts can be reduced. Further, according to the third aspect of the present invention, wobbling of the fitting cylinder within the support hole is suppressed by the elastic deformation of the elastic fitting member.

In the tool holder according to the fourth aspect of the present invention, the rotational position of the cutting tool can be easily specified by the scale and indication mark provided on the head portion and the support base.

Since the support base of the tool holder according to the fifth aspect is tapered upward, it is difficult for chips to accumulate.

A perspective view of a lathe according to a first embodiment of the present disclosure Side sectional view of cutting tool and tool holder Perspective view of movable base Exploded perspective view of tool holder Perspective view of cutting tool and tool holder Conceptual diagram of an example of skiving processing by changing the direction of the cutting tool (A) Front view of the movable base of the second embodiment with a cutting tool attached, (B) Front view of the movable base with no cutting tool attached. Side sectional view of the movable base of the third embodiment Side sectional view of the tool holder of the fourth embodiment A plan view of the support base of the fifth embodiment A perspective view of the support base of the sixth embodiment A perspective view of the support base of the seventh embodiment

[First embodiment]
Hereinafter, an embodiment of a lathe 100 including a cutting tool 30A, a tool holder 10A, and a tool fixing structure for fixing them according to the present disclosure will be described with reference to FIGS. 1 to 6. This lathe 100 performs skiving processing, and has a known structure except for the cutting tool 30A and the tool holder 10A. That is, the lathe 100 includes a chuck section 102 on a main shaft 101 having a horizontal rotation axis, and the rod-shaped workpiece 90 is held in a centered state by the chuck section 102 . Further, in front of the main shaft 101, a center tool (not shown) that abuts against the tip of the workpiece 90 and rotates together with the workpiece 90 is provided. Then, the workpiece 90 is rotationally driven, for example, in a clockwise direction when viewed from the center tool side.

The lathe 100 is equipped with a tool moving section 105 whose positioning is controlled at an arbitrary position. The tool moving section 105 has a plurality of screw holes (not shown) on a flat upper surface. The tool holder 10A is stacked on the upper surface of the tool moving section 105 and fixed with bolts. A cutting tool 30A is held in the tool holder 10A.

The cutting tool 30A approaches the workpiece 90 in a direction perpendicular to the rotational axis J1 of the workpiece 90 in a direction opposite to the circumferential speed direction of the workpiece 90, and is pressed to a position of the workpiece 90 that is offset from the rotational axis J1. . Specifically, in this embodiment, the cutting tool 30A is sent in a horizontal direction perpendicular to the rotation axis J1, and is pressed against, for example, a portion of the workpiece 90 below the rotation axis J1.

Hereinafter, in order to explain the tool holder 10A and the cutting tool 30A in detail, the horizontal direction parallel to the rotation axis J1 is referred to as the "Z direction", the horizontal direction perpendicular to the rotation axis J1 is referred to as the "Y direction", and Z, Y The vertical direction perpendicular to both directions is called the "X direction." Further, the X direction is also referred to as the vertical direction as appropriate. Furthermore, regarding the Y direction, when the tool holder 10A is separated from the workpiece 90 in the Y direction, the side closer to the workpiece 90 will be referred to as the "front side" and the opposite side will be referred to as the "rear side".

As shown in FIG. 2, the tool holder 10A includes a movable base 11 and a support base 20. Further, as shown in FIG. 3, the movable base 11 includes a head portion 12 and a support shaft 16 having a circular cross section that hangs down from the lower surface of the head portion 12. The head portion 12 has a V-shaped groove 13 on the front surface 12F of a rectangular parallelepiped, and has a structure in which the upper surface 12A is inclined downward toward the rear surface 12B. Furthermore, a pair of C-chamfered surfaces 12E are formed at the corners of the top surface 12A and both side surfaces 12C of the head portion 12, and the chamfer width gradually decreases from the rear end toward a position near the front end. Furthermore, the rear surface 12B of the head portion 12 is provided with a rear protrusion 14.

The rear projecting piece 14 protrudes rearward from the entire lower edge of the rear surface 12B of the head portion 12, and has a curved side surface 14A concentric with the support shaft 16. Further, both ends of the curved side surface 14A are located on the corner ridgeline between the both side surfaces 12C and the rear surface 12B of the head portion 12. Further, the lower surface of the rear projecting piece 14 and the lower surface of the head portion 12 are flat surfaces that are flush with each other and perpendicular to the central axis of the support shaft 16. Furthermore, an instruction mark 14M is engraved at the center of the outer edge of the upper surface of the rear protruding piece 14. The instruction mark 14M has, for example, a straight line shape extending in the radial direction of the curved side surface 14A.

The V-shaped groove 13 extends across the entire front surface 12F of the head portion 12 in the lateral direction, and includes a pair of V-shaped inner surfaces 13A and 13B that are vertically opposed to each other. A back surface 13C that is perpendicular to the front-rear direction is provided at the back (bottom) of the V-shaped groove 13, and there is a gap between the upper and lower edges of the back surface 13C and the pair of V-shaped inner surfaces 13A and 13B. They are connected by a pair of horizontal stepped surfaces 13D. Further, the upper V-shaped inner surface 13A has a smaller vertical width than the lower V-shaped inner surface 13A, and the front edge of the upper V-shaped inner surface 13A is the front end of the lower V-shaped inner surface 13A. It is located behind the edge. Furthermore, a pair of through holes 12H are formed at two locations in the longitudinal direction of the inner surface 13C of the V-shaped groove 13, which penetrate the head portion 12 in the front and back directions.

The cutting tool 30A has an elongated shape with approximately the same length as the V-shaped groove 13, and its cross section is approximately trapezoidal as shown in FIG. It has a pair of V-shaped outer surfaces 33A, 33B that are in surface contact with the side surfaces 13A, 13B. Further, the pair of V-shaped outer surfaces 33A and 33B are bent toward each other at a position near the front end. Furthermore, a pair of through holes 32 corresponding to the pair of through holes 12H of the head portion 12 described above are formed at two locations in the longitudinal direction of the cutting tool 30A. The cutting tool 30A is fixed to the head portion 12 by a pair of bolts B passed through the through holes 12H and 32 and a pair of nuts screwed onto them (see FIG. 3).

When the cutting tool 30A is fixed to the head portion 12, the upper edge portion protrudes upward from the head portion 12, and the protruding portion serves as the blade portion 31. Specifically, the front surface of the cutting tool 30A forms the rake face 31A of the blade part 31, the front edge of the upper V-shaped outer surface 33A forms the flank face 31B of the blade part 31, and the rake face 31A and the flank face 31B is the blade line 31C of the blade portion 31.

As shown in FIG. 7, the support base 20 has a shape in which a truncated cone-shaped conical part 22 is stacked on a rectangular parallelepiped-shaped base part 21. Further, a plurality of arcuate grooves 23 extending in the vertical direction are formed on the side surface of the support base 20. The arcuate groove 23 is disposed at the center of each side surface of the base portion 21 in the lateral direction, and extends from the lower surface of the support base 20 to an intermediate position of the conical portion 22 in the vertical direction. Furthermore, a scale 20M for indicating the rotational position of the head portion 12 is engraved on the upper side of the conical portion 22.

At the four corners of the support base 20, counterbore holes 20Z are vertically penetrated. The support base 20 is fixed to the tool moving section 105 by screwing the bolts passed through the counterbore holes 20Z into a plurality of screw holes (not shown) of the tool moving section 105 (see FIG. 1).

A support hole 24 vertically passes through the center of the planar shape of the support base 20, and the upper end opening of the support hole 24 opens to the upper surface 20A of the support base 20. Thereby, the upper surface 20A of the support base 20 has a ring shape surrounding the upper surface opening of the support hole 24. Further, as shown in FIG. 2, the support hole 24 includes a small inner diameter portion 24A and a large inner diameter portion 24B arranged vertically, and has a horizontal step surface 24C between them. Further, a portion of the large inner diameter portion 24B intersects with the aforementioned arcuate groove 23, and as a result, a side opening 23K is opened in the arcuate groove 23, as shown in FIG.

As shown in FIG. 2, a fitting cylinder 25 and an elastic fitting member 27 are fitted inside the support hole 24. As shown in FIG. 4, the fitting cylinder 25 has a small outer diameter portion 25A that fits into the small inner diameter portion 24A of the support hole 24, and a large outer diameter portion that fits into the large inner diameter portion 24B of the support hole 24. It has an outer diameter portion 25B. Further, the inside of the fitting cylinder 25 has a uniform inner diameter throughout.

The elastic fitting member 27 has a disk shape, has an outer diameter that is approximately the same as the large outer diameter portion 25B of the fitting cylinder 25, and has an inner diameter that is slightly larger than the inner diameter of the fitting cylinder 25. Further, as shown in FIG. 2, the elastic fitting member 27 is stacked below the fitting cylinder 25 within the support hole 24, and the lower end of the elastic fitting member 27 slightly protrudes from the lower surface of the support base 20. . Then, by tightening the bolt that attaches the support base 20 to the upper surface of the tool moving part 105, the elastic fitting member 27 is elastically deformed, and the step surface 25C on the outer surface of the fitting cylinder 25 is moved inside the support hole 24. It is pressed against the step surface 24C on the side surface. This suppresses rotation and vertical play of the fitting cylinder 25 with respect to the support base 20. Further, in this state, the upper surface of the fitting cylinder 25 is located slightly below the upper surface 20A of the support base 20.

A liquid storage chamber (not shown) for storing fluid is provided inside the fitting cylinder 25. Further, as shown in FIG. 4, the large outer diameter portion 25B of the fitting cylinder 25 is formed with a communicating screw hole 25N that communicates with the liquid storage chamber. The communicating screw hole 25N extends in a direction inclined with respect to the radial direction of the large outer diameter portion 25B, and a counterbore portion 25Z that is expanded from the communicating screw hole 25N is formed at the open end of the communicating screw hole 25N. There is. The adjusting screw 26 is screwed into the communicating screw hole 25N, and the head portion of the adjusting screw 26 is accommodated in the counterbore portion 25Z. In addition, in order to prevent the adjustment screw 26 from being screwed to a position where it accidentally comes out of the communication screw hole 25N, an interference protrusion 25K (specifically, a set screw or pin) protrudes from the inner surface of the counterbore portion 25Z. ing. Furthermore, as shown in FIG. 5, the adjustment screw 26 faces outward from the side opening 23K of the arcuate groove 23, so that the adjustment screw 26 can be screwed in from the side of the support base 20. ing.

As shown in FIG. 2, the support shaft 16 of the movable base 11 is fitted inside the fitting cylinder 25. Further, the lower surface of the head portion 12 is overlapped with the upper surface 20A of the support base 20, so that the movable base 11 is positioned with respect to the support base 20 in the axial direction of the support shaft 16. Then, with the adjustment screw 26 loosened, the movable base 11 can be rotated to any rotational position relative to the support base 20, and the movable base 11 can be extracted from the support base 20. Furthermore, when the adjustment screw 26 is tightened, the internal pressure of the liquid storage chamber in the fitting cylinder 25 increases, and the small outer diameter portion 25A of the fitting cylinder 25 bulges inward and outward, causing the fitting cylinder 25 to expand. The support shaft 16 and the support base 20 are frictionally engaged. Thereby, the movable base 11 is fixed to the support base 20 so as to be non-rotatable and non-movable up and down.

The explanation regarding the configuration of this embodiment is above. Next, the effects of the tool holder 10A will be described using an example in which the workpiece 90 shown in FIG. 6 is skived using the lathe 100 of this embodiment. A workpiece 90 in the figure is provided with first to sixth workpieces 91 to 96 from one end in the axial direction to the other end, and among these, the first and sixth workpieces are spaced apart. The third and fifth processed parts 91, 93, and 95 are skived. Further, the processed parts 92 and 94 located next to the first, third and fifth processed parts 91, 93 and 95 are The outer diameters are larger or the same. Moreover, the axial lengths of the first, third, and fifth processed parts 91, 93, and 95 are different from each other.

In such a case, the tool holder 10A of this embodiment has a structure in which the movable base 11 to which the cutting tool 30A is fixed is fixed at any rotational position, so skiving can be performed as follows. I can do it. That is, when skiving the first workpiece part 91, the blade line 31C of the cutting tool 30A is applied to the entire first workpiece part 91 in the Y direction (direction perpendicular to the rotation axis J1 of the workpiece 90). The rotational position of the movable base 11 is adjusted and fixed so that the entire movable base 11 is exactly facing each other. As a result, skiving can be performed by moving the cutting tool 30A only in the Y direction and the 1 processed portion 91 is processed.

Further, after finishing machining the first workpiece part 91, the cutting tool 30A is separated from the first workpiece part 91 in the Y direction, moved in the Z direction, and placed at a position facing the third workpiece part 93. do. Then, the adjustment screw 26 of the fitting cylinder 25 is operated to change the rotational position of the movable base 11, so that the entire blade line 31C of the cutting tool 30A is exactly opposed to the entire third workpiece part 93 in the Y direction. The movable base 11 is fixed at a rotational position so that the movable base 11 is rotated. From there, the third workpiece portion 93 can be skived by moving the cutting tool 30A only in the Y direction and the X direction, and the third workpiece portion 93 is processed with high processing accuracy. Thereafter, the fifth processed portion 95 is also processed with high processing accuracy in the same manner.

In this way, in the tool holder 10A of this embodiment, the movable base 11 to which the cutting tool 30A is fixed is rotatably supported and fixed at any rotational position by the fitting cylinder 25 as a chuck mechanism. Then, the movable base 11 is rotated at such a position that the entire blade line 31C of the cutting tool 30A is exactly opposed to each of the workpieces having various axial lengths in a direction orthogonal to the rotational axis J1 of the workpiece 90. can be adjusted and fixed. This makes it possible to skive workpieces with various axial lengths with high precision without incurring any cost.

Further, in the tool holder 10A of this embodiment, since the movable base 11 can be easily attached and detached as described above, for example, a plurality of movable bases 11 to which cutting tools 30A having different lengths of the blade lines 31C are attached may be prepared. By replacing these movable bases 11, it is possible to easily handle a plurality of workpieces having different axial lengths over a wide range.

Furthermore, since the support base 20 has a conical portion 22 that tapers upward (corresponding to the “tapered portion” in the claims), accumulation of chips on the support base 20 is suppressed. be done.

In addition, by recording the rotational position of the movable base 11 for each workpiece at the position of the scale 20M indicated by the instruction mark 14M, the rotational position of the movable base 11 can be recorded when processing workpieces with the same axial length. Adjustment becomes easier.

Furthermore, in the tool holder 10A of this embodiment, the tool moving part 105 to which the support base 20 is fixed is also used as a lid that prevents the fitting cylinder 25 from slipping out into the support hole 24, thereby reducing the number of parts. is planned. Moreover, the elastic deformation of the elastic fitting member 27 assembled into the support hole 24 together with the fitting cylinder 25 prevents the fitting cylinder 25 from shaking in the axial direction within the support hole 24, and the fitting cylinder The holding of the movable base 11 by the body 25 becomes stable.

[Second embodiment]
FIG. 7 shows the movable base 11B and cutting tool 30B of this embodiment. Further, in FIG. 7, the same reference numerals as in the first embodiment are attached to the parts already explained in the first embodiment. Hereinafter, only the parts that are different from the first embodiment will be explained.

As shown in FIG. 7(B), the head portion 12 of the movable base 11B is shorter in the lateral direction than the head portion 12 of the movable base 11 of the first embodiment, and the front surface 12F of the head portion 12 is shorter than the head portion 12 of the movable base 11 of the first embodiment. A through hole 12H that penetrates the head portion 12 in the front and back directions is provided at the center of the vertical and horizontal directions on the inner surface 13C of the V-shaped groove 13 provided therein.

As shown in FIG. 7(A), the cutting tool 30B has a substantially truncated pyramid shape that is rotationally symmetrical at 90 degrees. Further, the cutting tool 30B is formed with a through hole that penetrates the center portion of the front surface in the front and back directions. Note that a 90 degree rotationally symmetrical shape refers to a shape that looks the same even when rotated 90 degrees, and the cutting tool 30B looks the same even when rotated 90 degrees around the through hole.

Further, each of the four-directed slopes of the cutting tool 30B is an outer slope 33C that can come into surface contact with the V-shaped inner surfaces 13A, 13B of the V-shaped groove 13. Further, each outer slope 33C is bent at a position close to the front end body to form the flank 31B (see FIG. 2) described in the first embodiment. Four blade parts 31 having the above-mentioned flank face 31B, a rake face 31A which is the front surface of the cutting tool 30B, and a blade line 31C between them are formed on the four outer edges of the cutting tool 30B. There is.

According to the configuration of this embodiment, four blade parts 31 can be used by attaching the cutting tool 30B to the tool holder 10A while changing the angle by 90 degrees.

[Third embodiment]
FIG. 8 shows a movable base 11C and a cutting tool 30C of this embodiment. The movable base 11C of this embodiment has a V-shaped groove 13 extending laterally on the upper surface of the head portion 12. Further, one or more screw holes 12M are formed in the inner surface 13C of the V-shaped groove 13.

The cutting tool 30C has V-shaped outer surfaces 33A, 33B that come into surface contact with the V-shaped inner surfaces 13A, 13B of the V-shaped groove 13. The cutting tool 30C has one or more counterbored holes 38 passing through it vertically, and the bolts B passed through the counterbored holes 38 are tightened into the screw holes 12M to attach the cutting tool 30C to the movable base 11C. Fixed. The upper front corner of the cutting tool 30C serves as a blade portion 31. Specifically, the blade portion 31 has a rake surface 31A that is bent from the upper edge of the front V-shaped outer surface 33A and is substantially parallel to the axial direction of the support shaft 16. Further, the upper surface 30J of the cutting tool 30C is inclined downwardly toward the rear, and its front edge forms the flank surface 31B of the blade portion 31.

The movable base 11C and cutting tool 30C of this embodiment may be used by being attached to the support base 20 of the first embodiment or the support bases 20F and 20G of the sixth and seventh embodiments described later.

[Fourth embodiment]
In the tool holder 10B of this embodiment shown in FIG. 9, a liquid storage chamber (not shown) is provided inside the support shaft 16 provided on the movable base 11D. Further, a communicating screw hole 16N communicating with the liquid storage chamber is formed at the lower end of the support shaft 16, and one end thereof opens at the lower end of the side surface of the support shaft 16. An adjustment screw 26 is screwed into the communicating screw hole 16N. Further, this tool holder 10B does not include the fitting cylinder 25 described in the first embodiment, and the support shaft 16 is directly fitted into the support hole 24 of the support base 20D. Then, by tightening the adjustment screw 26 through the side opening 23K of the arcuate groove 23, the support shaft 16 expands to become thicker, and the movable base 11D is fixed to the support base 20D. The configuration of this embodiment also produces effects similar to those of the first embodiment.

Note that the adjustment screw 26 may be housed inside the communicating screw hole 16N so that it does not protrude from the outer surface of the support shaft 16, so that the movable base 11D can be easily removed from the support base 20D. Further, the communicating screw hole 16N may be arranged on the upper surface 12A of the head portion 12 of the movable base 11D. This makes it easier to remove the movable base 11D and operate the adjustment screw 26.

[Fifth embodiment]
The support base 20E of the tool holder 10C of this embodiment shown in FIG. 10 has a structure in which the arcuate groove 23 and the side opening 23K are removed from the support base 20 of the first embodiment. In order to operate the adjustment screw 26 of the fitting cylinder 25 from the outside, an operation hole 28A is provided on the coaxial extension of the adjustment screw 26, passing through between the inner and outer surfaces of the support base 20E. There is. Further, a screw hole 28B penetrating between the inner and outer surfaces of the support base 20E is provided at a position different from the operation hole 28A. A set screw (not shown) screwed into the screw hole 28B prevents the fitting cylinder 25 from rotating inside the support hole 24, so that the adjustment screw 26 can be operated from the outside of the support base 20E through the operation hole 28A. It has become.

[Sixth embodiment]
As shown in FIG. 11, the tool holder 10D of this embodiment includes a support base 20F having a chuck mechanism having the same structure as the chuck part 102 (see FIG. 1) that holds the workpiece 90 in the lathe 100. By screwing together the operation bolt 43 on the side surface of the support base 20F, the claws 42 approach from three sides toward the center of the support hole 24 to hold the support shaft 16, allowing the movable base 11 to move freely. is fixed in the rotational position.

[Seventh embodiment]
As shown in FIG. 12, the tool holder 10E of this embodiment includes, for example, a support base 20G having a chuck mechanism that is the same as a general chuck mechanism that holds a tool of an electric drill. Specifically, the support base 20G includes a ring-shaped bevel gear 52 on the upper surface of a support plate 51 that is superimposed and fixed on the tool moving part 105, and a plurality of clamping claws 55 are arranged in an annular shape inside the bevel gear 52. They are lined up and surrounded by a cap member 53. Further, a plurality of engagement holes 54 are formed in the side surface of the cap member 53. Then, by engaging the tip of the shaft 59S of the special tool 59 having a bevel gear 59G in the middle of the shaft 59S with the engagement hole 54 and meshing the bevel gears 52 and 59G, the special tool 59 is rotated. The clamping claws 55 of the clamping claws 55 narrow or widen. By arranging the support shaft 16 of the movable base 11 inside the plurality of clamping claws 55, the movable base 11 is fixed at an arbitrary rotational position.

[Additional notes]
(1) In the first to seventh embodiments, the feeding direction of the tool holder 10A is the Y direction, but it may be in any of the vertical direction, horizontal direction, and oblique vertical direction. The contact position of 30A may be above, below, to the side of, or diagonally to the side of the rotation axis J1, as long as it is offset from the rotation axis J1. That is, the tool holder of the present disclosure can be applied to all equipment in which a cutting tool can perform skiving by moving in a direction perpendicular to the rotation axis of a workpiece.

(2) Furthermore, the tool holder of the present disclosure may be attached to the tool moving part of a lathe that performs skiving processing and normal lathe processing (processing that moves the tool holder 10A in the Z direction), or It may also be attached to the tool moving part of a lathe that only performs machining.

10A to 10E Tool holder 11, 11B to 11D Movable base 12 Head part 14M Instruction mark 16 Support shaft 16N Communication screw hole 20, 20D to 20G Support base 20M Scale 24 Support hole 24A Small inner diameter part 24B Large inner diameter part 24C Step surface 25 Fitting Combined cylinder 25A Small outer diameter part 25B Large outer diameter part 25C Step surface 25N Communication screw hole 26 Adjustment screw 27 Elastic fitting member 30A to 30C Cutting tool 31C Blade line 105 Tool moving part

Claims (5)

A tool holder fixed to a tool moving part of a lathe and holding a cutting tool,
a movable base comprising a head part to which the cutting tool is fixed at one end of a support shaft, and in which the blade line of the cutting tool and the axial direction of the support shaft are orthogonal;
a support base having a support hole into which the support shaft rotatably fits;
a chuck mechanism provided on the support base for tightening and fixing the support shaft at any rotational position within the support hole;
has
The chuck mechanism is
a fitting cylinder fitted between an inner surface of the support hole and an outer surface of the support shaft;
a liquid storage chamber formed inside the fitting cylinder and filled with liquid;
a communicating screw hole formed in the fitting cylinder and communicating with the liquid storage chamber;
an adjustment screw screwed into the communicating screw hole;
an operation port formed on the support base and allowing the adjustment screw to face outward;
A tool holder in which the internal pressure of the liquid storage chamber is increased by the screwing operation of the adjustment screw, causing the fitting cylinder to bulge in and out, and the fitting cylinder is frictionally fixed to the support hole and the support shaft. The support hole is provided with a small inner diameter part and a large inner diameter part so that the diameter of the head part side is reduced, and a small outer diameter part and a large outer diameter part that fit into these parts are formed on the fitting cylinder. is,
The tool holder according to claim 1 , wherein an opening on the large inner diameter side of the support hole is closed by the tool moving section . The tool holder according to claim 2, further comprising an elastic fitting member that is fitted into the large inner diameter portion together with the large outer diameter portion and is elastically deformed when the support base is fixed to the tool moving portion. a scale provided on one of the head portion and the support base and arranged in an arc shape centered on the support hole;
A claim according to any one of claims 1 to 3, further comprising an instruction mark provided on the other of the head portion and the support base and that can be superimposed on any of the scales depending on the rotational position of the movable base. Tool holder described in . The tool holder according to any one of claims 1 to 4 , wherein the support base has a tapered portion that tapers upward .

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