JP2001079724A - Cutting tool mounting device, cutting tool supporting rigidity reinforcing device and fixing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve supporting rigidity of a cutting tool by a tool shaft of a machine tool. SOLUTION: A ring member 160 is fixed on a main spindle 16 by a fixing device 162. An inner peripheral surface of a through hole 176 of the ring member 160 is made a taper inner peripheral surface 180 corresponding to a taper outer peripheral surface 35 of a flange part 30. A taper shank 26 is fitted in a taper fitting hole 152 and a rear end part of the flange part 30 is fitted in the through hole 176 of the ring member 160 at the time of installing a tool holder 10 on the main spindle 16. A rear end surface 34 of a holder body 24 makes contact with a head end surface 150 of the main spindle 16 and a taper outer peripheral surface 35 is fastened and fitted on the taper inner peripheral surface 180 of the ring member 160 when the taper shank 26 is drawn in. A taper outer peripheral surface 82 of the taper shank 26 is fastened and fitted on a taper inner peripheral surface 154 of the taper fitting hole 152 and the rear end surface 34 is strongly drawn to the head end surface 150 when the taper shank 26 is further drawn in. Relative movement in the radial direction is restrained as the flange part 30 is supported on the main spindle 16 by the ring member 160 while realizing double constraint.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting tool mounting apparatus for removably attaching a cutting tool to a tool shaft having a fitting hole opened at a tip end surface such as a main shaft of a machine tool.
The present invention relates to a device for enhancing support rigidity of a cutting tool in the cutting tool mounting device, or a fixing device suitable for such a device.

[0002]

2. Description of the Related Art A tool holder for removably attaching a cutting tool to a tool shaft of a machine tool having a fitting hole opened at a front end surface is widely used. This type of tool holder includes a large-diameter portion, and a fitting projection that extends in a direction perpendicular to one end surface of the large-diameter portion and has a smaller diameter than the large-diameter portion. It is detachably attached to the tool shaft in a state where it is fitted. Since this tool holder has a cutting tool holding portion, the cutting tool is held by the cutting tool holding portion,
By attaching and detaching the tool holder, the cutting tool can be attached to and detached from the tool shaft.

However, in the conventional mounting of the cutting tool using the tool holder, the support rigidity of the cutting tool by the tool shaft may not be sufficient. If the support rigidity of the cutting tool is insufficient, there arise problems such as insufficient cutting accuracy being obtained, and insufficient production efficiency resulting in insufficient production efficiency.

[0004]

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention has been made to directly increase the support rigidity of a cutting tool by a tool shaft. According to the present invention, a cutting tool mounting device, a cutting tool support rigidity increasing device, and a fixing device of the following embodiments can be obtained. As in the case of the claims, each aspect is divided into sections, each section is numbered, and if necessary, the other sections are cited in a form in which the numbers are cited. This is for the purpose of facilitating the understanding of the present invention and should not be construed as limiting the technical features and combinations thereof described in the present specification to those described in the following sections. . Further, when a plurality of items are described in one section, it is not always necessary to adopt the plurality of items together, and it is also possible to take out and adopt only some of the items. (1) A cutting tool mounting device for removably attaching a cutting tool to a tool shaft of a machine tool having a fitting hole opened at a tip end surface, the cutting tool mounting device being provided with a large diameter portion and a right angle from one end surface of the large diameter portion. A fitting projection that extends in the direction, has a smaller diameter than the large diameter portion, and is detachably attached to the tool shaft in a state where the fitting projection is fitted with the fitting hole, and holds the cutting tool. A holder having a through hole having a circular cross-section that fits with an outer peripheral surface of the large-diameter portion in a state where the tool holder is attached to the tool shaft and the fitting protrusion is fitted and fitted in the fitting hole. An annular member;
A fixing device for fixing the annular member to the tool shaft. If the fitting projection of the tool holder is fitted into the fitting hole of the tool shaft and fixed by appropriate means such as being drawn into the tool shaft by a draw bar arranged inside the tool shaft, the tool The cutting tool held by the holder is attached to the tool shaft. When the fitting projection is a taper shank and the fitting hole is a taper hole, only the tight fitting of both, or the tight fitting of both and the end face of the large diameter portion and the tip face of the tool shaft are performed. The tool holder is fixed to the tool shaft by both of the contact. The tool holder mounted in the latter mode is called a two-sided constraint holder. When the fitting projection is a straight shaft having a cylindrical surface, the tool holder is fixed to the tool shaft by abutting the end surface of the large-diameter portion on the tip surface of the tool shaft. As the tool axis, a rotating tool spindle is most common, but a non-rotating axis such as a tailstock shaft of a lathe may be used. In the cutting tool mounting device of this aspect, the tool holder is mounted on the tool shaft as described above, and the annular member is fixed to the tool shaft by the fixing device, and the through hole of the annular member and the large diameter portion of the tool holder are provided. Are also fitted. This fitting also suppresses the relative movement of the tool holder in the radial direction with respect to the tool axis. Therefore, the rigidity of the support of the cutting tool by the tool axis is smaller than that of the conventional mounting of the cutting tool using only the tool holder. Improve. (2) The annular member is provided with the through hole, and is provided with a perforated disk portion which is brought into close contact with the tip end surface of the tool shaft, and extends rearward from the outer peripheral portion of the perforated disk portion to form an outer periphery of the tool shaft. The cutting tool mounting device according to item (1), further comprising a cylindrical portion that fits with the surface (claim 2). Thus, the annular member is provided with the perforated disk portion and the cylindrical portion, the perforated disk portion is brought into close contact with the tip surface of the tool shaft, and the cylindrical portion is fitted on the outer peripheral surface of the tool shaft. In this case, the annular member can be easily and accurately positioned with respect to the tool axis. (3) The fixing device is formed on the outer peripheral surface of the cylindrical portion with a depth that does not reach the inner peripheral surface, and divides the cylindrical portion into a front portion on the perforated disk side and a rear portion on the opposite side. A groove, a plurality of female screw holes formed in the front portion of the cylindrical portion, in parallel with a center line of the cylindrical portion, and opened in a groove side surface on a front portion side of the annular groove; The cutting tool mounting device according to (2), further including a plurality of screw members screwed into the female screw holes, respectively, and having a front end capable of contacting the side surface of the annular groove on the rear side. If the screw member is rotated and pressed against the groove side surface on the rear side of the annular groove, the width of the annular groove is expanded and the relative rotation is made about the bottom of the annular groove as the center of rotation. However, since the cylindrical portion is continuous with the perforated disk portion and has high rigidity, the rear portion is mainly rotated with respect to the front portion. Since this rotation occurs over the entire circumference of the rear portion, the portion of the rear portion away from the annular groove is reduced in diameter, and is strongly pressed against the outer peripheral surface of the tool shaft. The member is fixed to the tool shaft. By rotating several screw members as evenly as possible and pressing them equally against the groove side surface on the rear side of the annular groove, the diameter reduction at the rear part occurs evenly over the entire circumference, and the annular member Well concentrically fixed. As a result, the positioning accuracy of the tool holder with respect to the tool axis is improved by fitting the through hole of the annular member with the large-diameter portion of the tool holder. As a result, the cutting tool held by the tool holder is accurately attached to the tool axis. In other words, the precision of the cutting process is improved. Since the screw member can be rotated from the front of the tool shaft, the annular member can be fixed to the tool shaft without any trouble even when there is an obstacle on the outer peripheral side of the tool shaft. (4) A plurality of split grooves having a depth parallel to the center line of the cylindrical portion and reaching at least the annular groove are formed in the rear portion of the cylindrical portion, between the adjacent groove portions. The cutting tool mounting device according to the mode (3), wherein at least one of the plurality of screw members can be brought into contact with the portion (3). When a plurality of split grooves are formed in the rear portion, the diameter of the rear portion can be easily reduced, and the annular member can be easily fixed to the tool shaft. (5) The inner peripheral surface of the through hole is a tapered inner peripheral surface having a smaller diameter as the portion is closer to the tool axis, and is fitted with a corresponding tapered outer peripheral surface formed in a large diameter portion of the tool holder. The cutting tool mounting apparatus according to the above mode (1) to (4). If the inner peripheral surface of the through hole and the outer peripheral surface of the large-diameter portion are tapered, they can be easily fitted together with a small fitting gap. The perforated disk portion may have a straight inner peripheral surface, and the large-diameter portion may have a straight outer peripheral surface. It is desirable to form a chamfer to guide. (6) The cutting tool mounting device according to (5), wherein the inner peripheral surface of the taper and the outer peripheral surface of the taper are tightly fitted. If the inner peripheral surface of the taper and the outer peripheral surface of the taper are tightly fitted, the rigidity of support of the cutting tool by the tool shaft and the positioning accuracy are further improved. (7) a large-diameter portion, and a fitting projection that extends in a direction perpendicular to one end surface of the large-diameter portion and has a smaller diameter than the large-diameter portion;
A cutting tool in a cutting tool mounting device of a type in which a tool holder for holding a cutting tool is mounted on a tool shaft of a machine tool having a fitting hole opening at a front end face by fitting a fitting projection into the fitting hole. An apparatus for increasing the support rigidity of the tool, wherein the tool holder is fitted to the tool shaft, and the fitting projection is fitted to and fitted to the fitting hole, and is fitted to the outer peripheral surface of the large diameter portion. A cutting tool support rigidity increasing device (Claim 4), comprising: an annular member having a through hole with a circular cross section; and a fixing device for fixing the annular member to a tool shaft. The cutting tool support rigidity enhancing device according to this section is obtained by extracting a part of the cutting tool mounting device according to the above (1), and is used in combination with the ordinary tool holder. If this is the case, the support rigidity of the cutting tool by the tool axis can be increased. The features described in the above items (2) to (6) are also applicable to the cutting tool support rigidity enhancing device of this item. (8) A cylindrical member that can be fixed to the outer peripheral surface of a shaft member having a circular cross section, and is formed at a depth that does not reach the inner peripheral surface on the outer peripheral surface of the cylindrical member fitted to the outer peripheral surface of the shaft member. An annular groove which divides the member into a first part and a second part, and on the first part of the cylindrical part, on the groove side surface on the first part side of the annular groove parallel to the center line of the cylindrical part A plurality of female screw holes formed in an open state, and a plurality of screw members each of which is screwed into the plurality of female screw holes and whose tip can abut the groove side surface of the annular groove on the second portion side. A fixing device, characterized in that it comprises: The fixing device developed for fixing the cutting tool mounting device or the cutting tool support rigidity increasing device,
As a device for fixing a cylindrical member to the outer peripheral surface of a shaft member having a circular cross section, it can be used for a wide range of applications. The cylindrical member may be a member to be attached to the shaft member itself, or may be a member for attaching another member to the shaft member.
In the former case, if the annular groove is formed in the center of the cylindrical member in the axial direction, the first part and the second part are uniformly contracted, so that the shaft member can be gripped. In the latter case, the cylindrical member forms a cylindrical portion of another member. The features described in the above items (2) and (4) are also applicable to the fixing device of this item.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a state in which a tool holder 10 of the present embodiment is mounted on a main shaft 16 as a tool shaft of a machine tool. The tool holder 10 includes the holder body 2
4, a taper shank 26, a pull stud 28, and the like. As shown in FIG. 2, the holder main body 24 has a stepped cylindrical shape, and includes a flange portion 30 and a small-diameter cylindrical protrusion 32 extending concentrically from one end surface of the flange portion 30. A rear end surface 34 of the flange portion 30 on the side opposite to the cylindrical projection 32 side is a plane perpendicular to the axis. The rear end of the flange portion 30 has a tapered outer peripheral surface 3 inclined toward the axis as it approaches the rear end surface 34.
5 are formed. A rear end face 34 is provided on the flange portion 30.
And an outer circumferential surface, and two axially extending engaging recesses 36 are formed at two locations separated in the diameter direction. An annular groove 38 having a V-shaped cross section is formed at an axially intermediate portion of the flange portion 30. By holding the tool holder 10 on the tool holding arm of the automatic tool changer in the annular groove 38, the tool holder 10 is automatically moved to the main shaft 16.
Can be attached and detached.

As shown in FIG. 2, on the outer peripheral side of the cylindrical projection 32, keys 42 are provided at two positions separated in a diametrical direction. The key 42 is fixed by a bolt 46 to a key groove 44 provided in the flange portion 30 in the same phase as the engaging concave portion 36. A female screw hole 48 passing through the center is formed in the cylindrical projection 32. The cylindrical projection 32 in the present embodiment is provided with a face mill 50 as a processing tool.
(Shown by a two-dot chain line in FIG. 1), the through-hole 52 formed in the front milling tool 50 and the cylindrical protrusion 32 are fitted, and the key 42 and the front milling tool are fitted. The male screw portion 58 of the set bolt 56 is screwed into the female screw hole 48 in a state where the key groove 54 formed in the hole 50 is fitted. The flange portion 60 of the set bolt 56 contacts the counterbore hole bottom surface 62 of the front milling cutter 50, and the front milling cutter 50 is fixed to the tool holder 10. The set bolt 56 is rotated by engaging a hexagonal wrench (not shown) with a hexagonal hole (not shown) provided on the end face of the flange portion 60 on the side opposite to the male screw portion 58.

A straight hole 70 passing through the center axis is formed in the rear end face 34 of the holder body 24. A female screw hole 72 is formed on the bottom surface of the straight hole 70 on the center axis, and communicates with the female screw hole 48. Taper shank 2
6 includes a straight fitting portion 80 fitted slidably in the axial direction in the straight hole 70, and a taper fitting portion 84 having a tapered outer peripheral surface 82. Taper fitting section 84
The side close to the straight fitting portion 80 has a tapered fitting portion 84.
Is larger than the straight fitting portion 80, and the diameter gradually decreases as the distance from the straight fitting portion 80 increases. Front end surface 86 of taper fitting portion 84
And the rear end face 34 of the holder body 24 define the limit of fitting of the tapered shank 26 to the holder body 24.
The clearance between the straight hole 70 and the straight fitting portion 80 is desirably set to a value near 0, and particularly desirably a negative value. Even if the fitting clearance is negative and tight fitting is performed, if a large force is applied to the taper shank 26, the straight fitting portion 80 will
It can be slid within zero.

The tapered shank 26 has a center hole 90 extending axially from the front end face 88 of the straight fitting portion 80 through the center. The rear end face 92 of the taper shank 26 has a female screw hole 94 passing through the center and reaching the center hole 90.
Is formed, and the external thread portion 96 of the pull stud 28 is screwed.

A spring member 100 is provided between the holder main body 24 and the tapered shank 26, and urges the holder main body 24 and the tapered shank 26 in a direction approaching each other. The spring member 100 according to the present embodiment is configured such that a plurality of disc springs 102 are stacked in series so as to be alternately opposite in direction. One end of the spring member 100 is received by the holder body 24 via the spring receiving shaft 108, and the other end is received by the taper shank 26 via the spring receiving member 110. The spring bearing shaft 108 in the present embodiment is a stepped bolt,
At the end, the screw member 72 is screwed into the female screw hole 72 of the holder body 24, and receives the spring member 100 via the rolling thrust bearing 120 on the end surface 118 of the head 116 as a large diameter portion. A hexagonal hole 124 as a tool engagement portion is formed on a top surface 122 of the head 116 opposite to the end surface 118 of the head 116 that receives the spring, and a hexagon wrench (not shown) inserted from the female screw hole 94 side is engaged with the hexagonal hole 124. Rotated. The female screw hole 94
It also functions as a tool insertion hole.

An annular spring receiving member 110 is fitted near the opening of the center hole 90 of the tapered shank 26. Radial holes 130, 132 formed through the straight fitting portion 80 and the spring receiving member 110 in the radial direction.
The spring 134 is immovable in the center hole 90 by fitting the pin 134 across the. A through hole 138 passing through the center is formed in the spring receiving member 110, and the spring receiving shaft 108 passes through the through hole 138. Therefore, by providing the spring receiving member 110, an annular protrusion that protrudes radially inward from the inner peripheral surface of the center hole 90 is formed. The spring member 100 is received on an end surface 140 of the spring receiving member 110 that faces the head 116 of the spring receiving shaft 108. The spring bearing shaft 108 is not fixed to the holder body 24,
When the spring member 100 is in a free state, the spring receiving shaft 108 is at a position shown by a two-dot chain line in FIG.

In this state, a hexagon wrench is inserted from the female screw hole 94 and the spring receiving shaft 108 is rotated, whereby the male screw portion 114 is screwed into the female screw hole 72 and the spring receiving shaft 108 is attached to the spring member 100. It is moved toward the holder main body 24 against the force. Spring bearing shaft 10
8 is rotated by the rolling thrust bearing 120 so that the spring member 1 is rotated.
The movement is not transmitted to the 00 side, and only the movement in the axial direction is transmitted. After the spring bearing shaft 108 is fixed to the holder main body 24, the spring member 100 is in an elastically deformed state, and the biasing force is applied to the straight fitting portion 80 of the taper shank 26 into the straight hole 70 of the holder main body 24. Acts to increase the depth. After the taper shank 26 is attached to the holder main body 24, the male thread portion 96 of the pull stud 28 is screwed into the female thread hole 94 of the taper shank 26, and the assembly of the tool holder 10 is completed.

As shown in FIG. 1, a main shaft 16 of a machine tool to which the tool holder 10 of the present embodiment is attached has a taper fitting hole 152 as a fitting hole opened in a distal end face 150.
Are formed. The tapered fitting hole 152 has a tapered inner peripheral surface 154 corresponding to the tapered outer peripheral surface 82 of the tapered fitting portion 84 of the tapered shank 26. Taper fitting hole 1
A drawbar as a drawing device (not shown) is provided inside the communication hole communicating with 52, and engages with a pull stud 28 as an engaged portion to draw the taper shank 26 into the main shaft 16. As shown by the two-dot chain line in FIG.
The taper shank 26 is drawn toward the main shaft 16 against the urging force of the spring member 100 with respect to the holder body 24. The biasing force of the spring member 100 is set smaller than the pulling force applied to the pull stud 28 by the draw bar.

An annular member 160 is fixed to the main shaft 16 by a fixing device 162. The annular member 160 includes a hollow disk portion 168 and a cylindrical portion 172 extending from the outer peripheral portion of the rear end face 170 of the disk portion 168. Disk part 1
68 is brought into close contact with the distal end surface 150 of the main shaft 16 at the rear end surface 170, and the cylindrical portion 172 is fitted to the outer peripheral surface 175 of the main shaft 16 at the inner peripheral surface 174. The disc portion 168 has a through hole 176 penetrating the center. The inner peripheral surface of the through hole 176 has a front end surface 17 opposite to the rear end surface 170 of the disc portion 168 in a state attached to the main shaft 16.
The tapered inner peripheral surface 180 is inclined so as to approach the axis as it approaches the distal end surface 150 of the main shaft 16 from 8. The tapered inner peripheral surface 180 is inclined corresponding to the tapered outer peripheral surface 35 of the flange portion 30. An annular groove 186 having a depth that does not reach the inner peripheral surface 174 of the cylindrical portion 172 is formed at a substantially intermediate portion of the cylindrical portion 172 in the axial direction, so that the cylindrical portion 172 is formed with the front portion 188 and the rear portion 190.
And is divided into The outer peripheral surface of the rear portion 190 is
8 is smaller than the outer peripheral surface. Groove side 1 on the front portion 188 side of the annular groove 186 from the tip surface 178 of the disk portion 168
Internally threaded holes 194 opening in the hole 92 are formed at a plurality of locations (see FIG. 3) spaced at equal intervals in the circumferential direction. A screw member 196 is screwed into these female screw holes 194, and the distal end surface 198 can abut the groove side surface 200 on the rear portion 190 side of the annular groove 186.

The main shaft 16 also has two diametrically spaced apart shafts.
A drive key 204 protruding from the distal end face 150 is provided at a location. In the tapered inner peripheral surface 180 of the disk portion 168 of the annular member 160, cutouts 206 having a rectangular cross section slightly larger than the drive key 204 are provided at two locations diametrically separated.
When the annular member 160 is attached to the main shaft 16, the tip of the drive key 204 passes through the notch 206 and protrudes from the annular member 160.

The attachment of the annular member 160 to the main shaft 16 will be described. With the phase of the notch 206 of the annular member 160 and the phase of the drive key 204 of the main shaft 16 matched, the rear end surface 170 of the disk portion 168 of the annular member 160 is aligned with the front end surface 150 of the main shaft 16 from the front end surface 150 side of the main shaft 16. It is inserted until it comes in close contact. The ring member 16 is driven by the drive key 204
Rotation of the 0 with respect to the main shaft 16 is prevented. Then, when the screw member 196 is rotated by a rotary tool or the like and further tightened in a state where the tip end surface 198 is in contact with the groove side surface 200 of the annular groove 186, the rear portion 1 of the cylindrical portion 172 is
90 is pushed by the screw member 196, and the annular groove 186 is pushed out in the axial direction. Since the cylindrical portion 172 is continuous with the disk portion 168 on the front portion 188 side and has high rigidity, the rear portion 190 mainly has the annular groove 18 with respect to the front portion 188 side.
6 about the bottom. By rotating each screw member 196 as evenly as possible, the cylindrical portion 1 is rotated.
The diameter of the rear end side of the rear portion 190 farther from the annular groove 186 is reduced over the entire circumference of the rear portion 72, and the inner peripheral surface 174 of that portion is strongly pressed against the outer peripheral surface of the main shaft 16, and the
Are accurately and concentrically fixed to the main shaft 16.

The attachment of the tool holder 10 to the main shaft 16 will be described. Tool holder 10 held by a tool holding arm
However, in a state where the phases of the engagement recess 36 of the tool holder 10 and the drive key 204 of the main shaft 16 match, the tool holder 1
The 0 taper shank 26 is inserted into the taper fitting hole 152, and the taper outer peripheral surface 35 of the flange portion 30 is fitted into the through hole 176 of the disk portion 168 of the annular member 160. Then, the draw bar provided in the main shaft 16 is engaged with the pull stud 28 of the tapered shank 26, and the tapered shank 26 is retracted. First, the holder body 2
4, the rear end surface 34 abuts against the front end surface 150 of the main shaft 16, and the tapered outer peripheral surface 35 of the flange portion 30 is tightly fitted to the tapered inner peripheral surface 180 of the annular member 160. In this state, the tapered shank 26 There is a slight gap between the shaft and the tapered fitting hole 152 of the main shaft 16.
When the taper shank 26 is further retracted as shown by a two-dot chain line in FIG. 1, the straight fitting portion 80 of the taper shank 26 is slid in the straight hole 70 of the holder body 24, and the taper shank 26 is Is moved away from the holder main body 24 against the urging force of the above, and the tapered outer peripheral surface 82 is tightly fitted to the tapered inner peripheral surface 154 of the tapered fitting hole 152. Also, the spring member 1
By the urging force of 00, the rear end face 34 of the holder main body 24 is strongly attracted to the front end face 150 of the main shaft 16. In this way, dimensional errors of the taper fitting hole 152, the taper shank 26, etc. are absorbed to realize two-sided restraint, and the flange member 30 is also supported by the main shaft 16 by the annular member 160, so that relative movement in the radial direction can be performed. As a result, the tool holder 10 is firmly and accurately held on the main shaft 16.

At the time of cutting with the face mill 50 attached to the spindle 16 via the tool holder 10, the drive key 204 provided on the spindle 16 is attached to the flange 30.
The rotational torque of the main shaft 16 is reliably transmitted to the tool holder 10 by engaging with the engaging recess 36 formed in the tool holder 10. The processing resistance during the processing is determined by the rear end face 34 of the holder body 24.
The tip end surface 150 of the main shaft 16 contacting with the holder main body 24
Straight fitting portion 8 of taper shank 26 fitted to
0 and the tapered inner peripheral surface 180 of the annular member 160, the rear end surface 34 is brought into close contact with the front end surface 150, and the flange portion 30 and the tapered shank 26 are firmly held on the main shaft 16. Holder body 24
Of the main shaft 16 is well suppressed,
6 improves the support rigidity of the face milling cutter 50. When removing the tool holder 10 from the main shaft 16, the draw bar is advanced and the engagement with the pull stud 28 is released, and the taper shank 26 is returned to the holder main body 24 side by the urging force of the spring member 100, and Released from the close contact of
The tool holder 10 can be removed.

As is clear from the above description, in the present embodiment, the flange portion 30 forms a large diameter portion, and the tapered shank 26 forms a fitting projection. The tool holder 10, the annular member 160 and the fixing device 162 constitute a tool mounting device. Further, the spring receiving member 11
0 constitutes a spring receiving projection, and the spring receiving shaft 108, the spring receiving projection, and the spring member 100 constitute an urging device. Assuming that the main shaft 16 corresponds to the shaft member having a circular cross-section according to claim 5 and the cylindrical portion 172 of the annular member 160 corresponds to a cylindrical member fixed to the outer peripheral surface of the shaft member, the front portion 188 of the cylindrical portion 172 is cylindrical. The first part of the member has a rear 190
Correspond to the second part, and the first part and the second part together with the annular groove 186, the female screw hole 194, and the screw member 196 constitute a fixing device.

As in the above embodiment, when the outer peripheral surface of the rear end portion of the flange portion 30 is the tapered outer peripheral surface 35 and the through hole 176 of the annular member 160 is the tapered inner peripheral surface 180, the flange portion 30 can be formed. The tool can be easily fitted into and removed from the through hole 176. However, in the case of a tool holder in which the outer peripheral surface of the large diameter portion is parallel to the axial direction, the through hole of the annular member is a straight hole, It is also possible to adopt a form that holds the surface. An example is shown in FIG. Parts having the same configuration as the tool holder 10 are denoted by the same reference numerals, and description thereof is omitted.

The tool holder 300 shown in FIG. 4 includes a holder body 302 and the pull stud 28. The tool holder 300 according to the present embodiment includes a holder main body 302.
Is a flange portion 306 and a rear end face 3 of the flange portion 306.
08 and a small diameter tapered shank 310 extending concentrically
And a small-diameter cylindrical protrusion 32 extending concentrically from the front end face 312 of the flange portion 306.
06, a tool holder in which the taper shank 310 and the cylindrical projection 32 are integrally provided. The tapered shank portion 310 includes a tapered outer peripheral surface 316 that is inclined toward the axis as it approaches the rear end surface 314. A female screw hole 318 extending in the axial direction is formed in the rear end surface 314, and the male screw portion 96 of the pull stud 28 is screwed. The outer peripheral surface 322 of the rear end portion 320 of the flange portion 306 is a straight outer peripheral surface extending in parallel to the axial direction. Also, the rear end portion 320 of the flange portion 306
In the vicinity of the rear end surface 308, a chamfered portion 32 as a guide portion is provided.
4 are formed. Annular member 32 in the present embodiment
The through-hole 328 of the sixth disk portion 168 is a straight hole that extends in parallel with the axial direction and can be fitted with the rear end portion 320 of the flange portion 306 exactly. The clearance between the through hole 328 and the rear end portion 320 of the flange portion 306 is desirably set to a value close to 0, and particularly desirably a negative value. Even when the fitting clearance is set to a negative value and tightly fitted, the flange portion 306 can be removed from the through hole 328 by applying a large force to the flange portion 306 in the axial direction.

When the tool holder 300 in this embodiment is mounted on the main shaft 16, the tool holder 300 held by the tool holding arm is engaged with the engagement recess 3 of the tool holder 300.
6 and the drive key 204 of the main shaft 16 are in phase with each other and inserted into the tapered fitting hole 152, and the rear end portion 320 of the flange portion 320 is fitted into the through hole 328 of the annular member 326. Through hole 328 of flange portion 310
Into the chamfered portion 3 provided on the flange portion 310.
Guided by 24. Then, the draw bar provided inside the main shaft 16 is engaged with the pull stud 28 fixed to the rear end of the tapered shank 310, and when the pull stud 28 is retracted, the rear end 3 of the flange 306 is formed.
20 is tightly fitted into the through hole 328 of the disk portion 168 of the annular member 326, and the tapered outer circumferential surface 316 of the tapered shank portion 310 and the tapered inner circumferential surface 154 of the tapered fitting hole 152 are tightly fitted. Mated. At this time, the rear end face 308 of the flange portion 306 and the spindle 1
As shown in FIG. 4, a slight gap is formed between the front end surface 150 and the front end surface 150 of the base 6. Thus, the taper fitting hole 15
2 and the fitting protrusion 306 are tightly fitted and the flange 306 is fitted.
Due to the tight fit between the tool holder 300 and the annular member 326, the relative movement of the tool holder 300 in the radial direction is suppressed.
00 is firmly supported by the main shaft 16. Instead of the chamfered portion 324, a chamfered portion may be formed on the tip end side of the through hole 328 of the annular member 326, or a chamfered portion may be formed on the side of the flange portion 310 and the through hole 328 facing each other. It is also possible to form

The tool mounting device of the present embodiment and the tool mounting device of the embodiment shown in FIGS. 1 to 3 can be embodied in a form in which combinations of components are mutually changed. For example, in the tool holder 300 of the present embodiment,
While forming a taper outer peripheral surface on the flange portion 306,
The through hole of the annular member 326 may have a tapered inner peripheral surface corresponding to the tapered outer peripheral surface. Further, when the large-diameter portion of the two-surface restraint type tool holder as in the embodiment shown in FIGS. 1 to 3 is a straight outer peripheral surface,
The annular member 326 in the present embodiment can be applied.

As shown in FIG. 5, it is also possible to form radially extending split grooves 400 at a plurality of positions spaced apart in the circumferential direction of the annular member 160. The split groove 400 is provided at the rear portion 19.
0 from the rear end face to the annular groove 186, whereby the rear part 190 is composed of the partial cylindrical part 402 divided into a plurality of parts in the circumferential direction.
The effect that the diameter reduction of 90 is made easier is obtained. As an example, the form in which the split groove 400 is formed in the annular member 160 has been described. However, it is of course possible to form the split groove 400 in the annular member 326, and the number of the split grooves 400 can be appropriately set.

The configuration of the holder body can be variously changed, and the holder body has a collet chuck, a hydraulic chuck, and the like for holding other processing tools such as a drill, an end mill, a boring tool, and the like. Is possible. As described above, one embodiment of the present invention has been described in detail. However, this is merely an example, and the present invention is directed to the aspects described in the section [Problems to be Solved by the Invention, Problem Solving Means and Effects]. First, various modifications and improvements can be made based on the knowledge of those skilled in the art.

[Brief description of the drawings]

FIG. 1 is a front sectional view showing a cutting tool mounting device according to an embodiment of the present invention.

FIG. 2 is a plan view showing a holder main body of a tool holder of the cutting tool mounting device.

FIG. 3 is a sectional view taken along line AA of FIG. 1;

FIG. 4 is a front sectional view showing a cutting tool mounting device according to another embodiment of the present invention.

FIG. 5 is a side sectional view showing a cutting tool mounting device according to still another embodiment of the present invention.

[Explanation of symbols]

10: Tool holder 16: Spindle 24: Holder body 26: Taper shank 34: Rear end surface 35:
Taper outer peripheral surface 82: Taper outer peripheral surface 84: Taper fitting portion 160: Annular member 162: Fixing device
168: disk portion 170: rear end surface 172: cylindrical portion 174: inner peripheral surface 175: outer peripheral surface 176: through hole 180: tapered inner peripheral surface 186:
Annular groove 188: front part 190: rear part 19
4: female screw hole 196: screw member 200: groove side surface 300: tool holder 302: holder body 3
06: Flange part 310: Tapered shank part 316: Tapered outer peripheral surface
322: outer peripheral surface 326: annular member 328: through hole

Claims (5)

[Claims] 1. A cutting tool mounting device for removably mounting a cutting tool on a tool shaft of a machine tool having a fitting hole opened on a front end surface, comprising: a large-diameter portion and one end surface of the large-diameter portion. A fitting projection that extends in a perpendicular direction and has a smaller diameter than the large-diameter portion, is detachably attached to the tool shaft in a state where the fitting protrusion is fitted with the fitting hole, and holds the cutting tool. In a state where the tool holder is attached to the tool shaft and the fitting projection is fitted and fitted to the fitting hole, a through-hole having a circular cross section is fitted to the outer peripheral surface of the large diameter portion. A cutting tool mounting device, comprising: an annular member provided; and a fixing device for fixing the annular member to a tool shaft. 2. The tool according to claim 1, wherein the annular member includes a through-hole provided with the through-hole and closely attached to a tip end surface of the tool shaft, and extends rearward from an outer peripheral portion of the holed disk. The cutting tool mounting device according to claim 1, further comprising a cylindrical portion fitted with the outer peripheral surface of the cutting tool. 3. The fixing device is formed on the outer peripheral surface of the cylindrical portion with a depth that does not reach the inner peripheral surface, and divides the cylindrical portion into a front portion on the perforated disk side and a rear portion on the opposite side. An annular groove; and a plurality of female screw holes formed in the front portion of the cylindrical portion in a state parallel to the center line of the cylindrical portion and open on a groove side surface on the front side of the annular groove; The cutting tool mounting device according to claim 2, further comprising a plurality of screw members screwed into the plurality of female screw holes, respectively, and a plurality of threaded members each of which can be in contact with a groove side surface of the annular groove on the rear side. 4. A tool holder having a large-diameter portion and a fitting projection extending in a direction perpendicular to one end surface of the large-diameter portion and having a diameter smaller than that of the large-diameter portion. An apparatus for enhancing support rigidity of a cutting tool in a cutting tool mounting apparatus of a type in which a fitting projection is fitted to a fitting hole and attached to a tool shaft of a machine tool having a fitting hole opening on a surface. An annular member having a circular cross-section through-hole that fits with the outer peripheral surface of the large-diameter portion in a state where the tool holder is mounted on the tool shaft and the fitting protrusion is fitted and fitted in the fitting hole; And a fixing device for fixing the annular member to the tool shaft. 5. A cylindrical member that can be fixed to an outer peripheral surface of a shaft member having a circular cross section, and is formed on the outer peripheral surface of the cylindrical member fitted to the outer peripheral surface of the shaft member at a depth that does not reach the inner peripheral surface. An annular groove for dividing the cylindrical member into a first part and a second part; and a groove on the first part of the cylindrical part, parallel to the center line of the cylindrical part and on the first part side of the annular groove. A plurality of female screw holes formed in a state opened to the side surface; and a plurality of screw members screwed into the plurality of female screw holes, respectively, and having a tip abuttable on the groove side surface of the annular groove on the second portion side. And a fixing device.