JP2009125828A - Outer diameter minutely adjustable boring bar - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an outer diameter minutely adjustable boring bar which is simplified to achieve downsizing, improved in reliability of the fixture of a cartridge, and facilitates and stabilizes adjustment of a machining diameter without causing axial displacement of a cutting edge. <P>SOLUTION: According to the structure of the outer diameter minutely adjustable boring bar, a taper shim 3 is fitted into a seat groove 8 formed in a peripheral surface of a tool body 2 in a manner slidable in a tool axial direction, and a tool cartridge 5 whose positioning in a tool radial direction is achieved by a tapered surface 3a and whose positioning in a tool rotating direction is achieved by a first seat surface 8a of the seat groove 8, is provided for the body, followed by moving the tool cartridge 5 in the tool axial direction by an adjusting bolt 4, to thereby adjust the location of a cutter 5b in the tool radial direction. Further the tool cartridge 5 is fastened and fixed to the body by a clamp bolt 6a, and a disk spring 6b is contracted between a head of the clamp bolt 6a and the tool cartridge 5. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an outer diameter fine-tuning boring bar in which fine adjustment of a processing diameter can be accurately performed with a simple and excellent workability structure.

  Examples of the prior art of the above-described outer diameter fine-tuning boring bar include those described in Patent Documents 1 and 2 below.

  The tool disclosed in Patent Document 1 is provided with a pocket for opening a hole in the axial center part on the outer periphery of the outer drive spindle (tool body part) having a hole in the axial part, and a cutting edge is provided in the pocket. A tool cartridge is mounted so as to be movable in the radial direction, and a wedge incorporated in the hole is arranged inside the tool cartridge, and the wedge is driven by an inner drive spindle inserted in the center of the hole to move in the axial direction. Let The tool cartridge in contact with the wedge is moved in the axial direction to be displaced in the tool radial direction, and the radial position of the blade edge (that is, the machining diameter) is adjusted.

Further, the outer diameter fine-tuning boring bar disclosed in Patent Document 2 has a cartridge having a cutting tool attached to a mounting groove provided in the tool body, and the cartridge fixed to the tool body by clamping means is adjusted in the axial direction by an adjuster. Promote. The mounting groove has a first seat surface for positioning the cartridge in the tool rotation direction and a second seat surface for positioning in the tool radial direction, and the second seat surface has a predetermined inclination with respect to the axis of the tool. Corners are attached. Therefore, the cartridge moved in the tool axis direction is guided by the second seat surface and displaced in the tool radial direction, and the machining diameter is finely adjusted by the displacement.
Japanese translation of PCT publication No. 2003-522032 JP 2006-136970 A

  The tool disclosed in Patent Document 1 has a wedge for displacing the tool cartridge and an inner drive spindle inside the tool cartridge. Therefore, the structure becomes complicated and it is difficult to reduce the size. Further, since the hole for incorporating the inner drive spindle is provided in the axial center portion of the outer drive spindle, and the pocket for mounting the tool cartridge is provided in the outer drive spindle in communication with the hole, the tool rigidity tends to be lowered.

  Further, the tool cartridge is urged radially inward by a spring and pressed against the wedge, but it is difficult to use other clamping means together. Therefore, it is necessary to fix the tool cartridge depending on a spring that cannot be expected to have a large tightening force. Therefore, stable fixing cannot be expected, and it is difficult to ensure the stability of processing.

  In addition, the structure of Patent Document 2 secures the cartridge fixing reliability because the cartridge is fixed with a bolt. However, in this structure, it is necessary to adjust the machining diameter by loosening the clamping force with the bolt. Spicy. In addition, the position after adjustment may be shifted due to retightening of the bolt, and the adjustment accuracy may decrease. In addition, since the cartridge moves in two axial directions in accordance with the adjustment, it is necessary to control the processing machine to correct the axial deviation by adjusting the adjustment when there is a request to maintain the axial position of the cutting edge. become.

  The present invention eliminates the above-mentioned problems, that is, simplifies the structure so that the size can be reduced, and at the same time, increases the reliability of fixing the cartridge, and further adjusts the machining diameter without axial displacement of the blade edge. The challenge is to make it easy and stable.

  In order to solve the above-mentioned problems, in the present invention, an outer diameter fine-tuning boring bar, a tool body provided with a seat groove on the outer periphery, a taper shim that fits slidably in the tool axis direction in the seat groove, and the seat groove An adjustment bolt for moving the taper shim positioned in the tool radial direction on the second seat surface in the tool axial direction, positioning in the tool radial direction on the taper surface of the taper shim, and positioning in the tool rotation direction on the first of the seat groove. A tool cartridge provided with a cutting tool that is inserted in the seat groove so as to be slidable in the tool radial direction and not movable in the tool axial direction, and clamping means for fixing the tool cartridge and the taper shim to the tool body. I had it. In addition, the clamp means includes a clamp bolt and a disc spring that is contracted between the head of the clamp bolt and the tool cartridge, and the clamp bolt is provided with a mounting hole provided in the tool cartridge; The tool cartridge was screwed into the tool body by passing through a through hole having a size that allows the tool cartridge to move in the tool axis direction between the clamp bolt provided on the taper shim. The through hole is sized such that a clearance allowing a desired amount of axial movement of the taper shim is formed between the clamp bolt.

The preferable form of this outer diameter fine adjustment type boring bar is shown below.
(1) As the adjusting bolt, a head that is rotatable to the taper shim on one end side and engaged in an axially non-movable manner, a threaded portion on the other end side, and an external portion between the head and the threaded portion. What employ | adopted what respectively provided the rotation operation part which can be operated, and made this adjustment bolt parallel to a tool axis | shaft, and screwed the said screw part with the tool main body.
(2) A backlash suppressing screw that applies rotational resistance to the adjusting bolt is screwed into the tool body.
(3) The tool body is provided with a guide pin protruding from the first seating surface of the seat groove, the tool cartridge is provided with a guide groove extending in the tool radial direction, and the guide pin can be moved in the tool radial direction in the guide groove. The tool cartridge is engaged so as to stop the movement of the tool cartridge in the seat groove direction.

In the boring bar of the present invention, since the tool cartridge is fixed by tightening with a clamp bolt, the fixing force can be increased and the fixing reliability can be improved as compared with a structure depending on the spring force.
In addition, since the disc spring is interposed between the head of the clamp bolt and the tool cartridge, the machining diameter can be adjusted in a state in which a movement resistance is applied to the tool cartridge by the force of the disc spring.
Adjustment work is easy.
Furthermore, the position of the tool cartridge after adjustment due to retightening of the bolt can be prevented by the force of the spring, and adjustment accuracy does not deteriorate.

  Furthermore, since the tool cartridge does not move in the tool axis direction when adjusting the machining diameter, it is not necessary to correct the deviation when there is a request to maintain the axial position of the cutting edge.

  Embodiments of the present invention will be described below with reference to FIGS. As shown in FIGS. 1 to 4, the illustrated outer diameter fine adjustment boring bar 1 includes a tool body 2, a taper shim 3, an adjustment bolt 4, a tool cartridge 5, a clamping means 6, and a backlash suppressing screw. 7 is assembled.

  Although the tool main body 2 has shown what detachably adds the head part 2a which provides the tool cartridge 5 to the front-end | tip of the shank part 2b (FIG. 1), the head part and the shank part may be formed integrally. The outer periphery of the tip of the tool body 2 (the illustrated tool is the outer periphery of the head portion 2a) includes a first seating surface 8a shown in FIG. 3, a second seating surface 8b intersecting at right angles thereto, and a first seating surface 8a. A seat groove 8 having a third seating surface 8c facing in parallel is provided.

  The taper shim 3 is fitted in the seat groove 8 so as to be slidable in the tool axis direction by performing positioning in the tool radial direction on the second seat surface 8b. The taper shim 3 has a taper surface 3a having a predetermined inclination with respect to the axis C of the tool body 2, a through hole 3b, and an engagement groove 3d that opens to the surface 3c (see FIGS. 4 and 8). ing. The taper surface 3a is on the opposite side to the surface 3c in contact with the second seating surface 8b. Further, the through hole 3b is a hole in which a desired amount of axial movement of the taper shim 3 is formed between the through hole 3b and a clamp bolt 6a, which will be described later, and is provided through the tapered surface 3a to the surface 3c. It has been.

  The adjustment bolt 4 moves the taper shim 3 in the tool axis direction. The adjustment bolt 4 has a large-diameter head 4a shown in FIG. 4 on one end side. Moreover, it has the screw part 4b in the other end side, and has the rotation operation part 4c which can be operated from the outside between the head part 4a and the screw part 4b. The adjustment bolt 4 is engaged with the head 4a so as to be rotatable with respect to the engagement groove 3d of the taper shim 3 in parallel with the tool axis, so that the relative movement in the axial direction is impossible, and the screw portion 4b is screwed into the tool body 2. .

  The rotation operation unit 4c is provided with an operation hole (4d in FIG. 4) formed at a constant pitch on the outer periphery, and a rod-shaped wrench is inserted into the operation hole 4d to perform the rotation operation. A scale for displaying the rotation angle of the adjusting bolt 4 can be provided on the rear surface of the rotation operating portion 4c and the taper shim 3 (the rightmost surface in FIG. 4). There is a correlation between the amount of rotation of the adjusting bolt 4, the amount of axial movement of the taper shim 3, and the amount of radial displacement of the blade edge. You can know the amount of direction adjustment.

  The tool cartridge 5 includes a base 5a, a cutting tool 5b attached to a seat of a tip corner of the base, an attachment hole 5c (see FIGS. 4 and 6) penetrating the base 5a in the tool radial direction, and a tool radial direction. The guide groove 5d (see FIG. 4 and FIG. 7) extends in the direction. The cutting tool 5b provided in the illustrated tool cartridge 5 is a detachable throw-away tip that is fixed to the base 5a of the tool cartridge with a clamp screw 5e. The tool cartridge 5 is slidable in the tool radial direction in the seat groove 8 by positioning in the tool radial direction with the taper surface 3a of the taper shim 3 and positioning in the tool rotation direction with the first seat surface 8a. It is inserted so that it cannot move in the axial direction.

  As shown in FIG. 7, the guide groove 5d is provided on the first seating surface of the tool cartridge 5 supported by the first seating surface 8a, and is provided on the tool body 2 so as to protrude from the first seating surface 8a. 9 is engaged with the guide groove 5d so as to be movable in the tool radial direction so that the movement of the tool cartridge 5 in the tool axis direction is restricted. A plurality of guide pins 9 and guide grooves 5d are provided in the illustrated boring bar. However, if at least one guide pin 9 and one guide groove 5d are provided, the purpose of installation is achieved.

  The clamp means 6 includes a clamp bolt 6 a shown in FIG. 4 and a disc spring 6 b that is contracted between the head of the clamp bolt 6 a and the tool cartridge 5. The clamp bolt 6 a is an element for fixing the tool cartridge 5 and the taper shim 3 to the tool body 2, and includes a mounting hole 5 c provided in the tool cartridge 5 and a long through hole 3 b in the tool axis direction provided in the taper shim 3. Each of the screw shafts is passed through and screwed into the tool body 2.

  The backlash suppression screw 7 is screwed into the tool body 2 (see FIGS. 1, 2, and 4), and applies rotational resistance to the adjustment bolt 4 to prevent loosening of the bolt during cutting. The portion to which the backlash suppression screw 7 is pressed is a trapezoidal screw as shown in FIG. This backlash restraining screw 7 is a preferred element but is not essential.

  The guide groove 5d and the guide pin 9 are not essential. The prevention of the movement of the tool cartridge 5 in the tool axis direction can also be performed by providing the tool body 2 with a movement restricting surface that engages with the tool cartridge 5.

  The exemplary outer diameter fine-tuning boring bar 1 configured as described above operates the clamp bolt 6a to rotate, and moves the taper shim 3 in the tool axis direction. Accordingly, the taper surface 3a of the taper shim 3 is displaced in the tool radial direction, the tool cartridge 5 positioned on the taper surface 3a moves in the tool radial direction, and the position of the cutting edge of the cutting tool 5b is finely adjusted in the tool radial direction. The

  In the structure of FIG. 4, the machining diameter increases when the taper shim 3 is moved to the right side in the drawing, but the operation of moving the taper shim 3 to the right side in the drawing with the inclination direction of the taper surface 3a reversed from the drawing. The processing diameter can also be reduced.

Partially broken plan view showing the main part of the boring bar of the present invention Side view showing the head of the boring bar of FIG. Front view of the head of the boring bar of FIG. The expanded sectional view of the position along the XX line of FIG. Side view of tool cartridge Sectional drawing of the position along the YY line of FIG. Sectional drawing of the position along the ZZ line of FIG. Perspective view of taper shim

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Outer diameter fine adjustment type boring bar 2 Tool body 2a Head part 2b Shank 3 Taper shim 3a Tapered surface 3b Through-hole 3c Surface 3d Engaging groove 4 Adjustment bolt 4a Head 4b Screw part 4c Rotation operation part 4d Operation hole 5 Tool cartridge 5a Base 5b Cutting tool 5c Mounting hole 5d Guide groove 5e Clamp screw 6 Clamp means 6a Clamp bolt 6b Belleville spring 7 Backlash suppression screw 8 Seat groove 8a First seat surface 8b Second seat surface 8c Third seat surface 9 Guide pin

Claims (4)

A tool body (2) provided with a seat groove (8) on the outer periphery, a taper shim (3) fitted to the seat groove (8) so as to be slidable in the tool axis direction, and a second seat surface (8b) of the seat groove (8) ), The adjustment bolt (4) for moving the taper shim (3) positioned in the tool radial direction in the tool axial direction, and the taper surface (3a) of the taper shim (3) for positioning in the tool radial direction. A blade tool (5b) is provided which is positioned on the first seat surface (8a) of the seat groove (8) and is slidable in the tool radial direction and cannot be moved in the tool axis direction. A tool cartridge (5), and the tool cartridge (5) and clamping means (6) for fixing the taper shim (3) to the tool body (2);
The clamp means (6) comprises a clamp bolt (6a), and a disc spring (6b) that is contracted between the head of the clamp bolt (6a) and the tool cartridge (5), and the clamp The tool axis direction of the tool cartridge (5) is arranged between the bolt (6a) between the mounting hole (5c) provided in the tool cartridge (5) and the clamp bolt (6a) provided in the taper shim (3). An outer diameter fine-tuning boring bar that is threaded into the tool body (2) through the through-holes (3b) each having a size that allows for movement into the tool body.   As the adjustment bolt (4), a head (4a) that can be rotated on the taper shim (3) on one end side and engaged in an axially non-movable manner, and a screw part (4b) on the other end side, Are provided with rotary operation portions (4c) that can be operated from the outside between the screw portion and the screw portion (4b) in parallel with the tool axis. The outer diameter fine-tuning boring bar according to claim 1, screwed into 2).   The outer diameter fine adjustment type boring bar according to claim 2, wherein a backlash suppressing screw (7) for applying rotational resistance to the adjustment bolt (4) is screwed into the tool body (2).   The tool body (2) is provided with a guide pin (9) protruding from the first seat surface (8a), the tool cartridge (5) is provided with a guide groove (5d) extending in the tool radial direction, and the guide pin ( 9) is engaged with the guide groove (5d) so as to be movable in the radial direction of the tool, so that the movement of the tool cartridge (5) in the seat groove (8) is stopped in the tool axis direction. The outer diameter fine-tuning boring bar according to any one of claims 1 to 3.

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