JP2000117525A - Cutter mounting device for internal crank shaft mirror - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve work efficiency and to improve productivity along therewith by a method wherein a cutter mounting device for an internal crank shaft mirror is provided to perform rapid and easy mounting and demounting work of a cutter body on and from a cutter adapter. SOLUTION: In an internal crank shaft wherein by rotating a cutter body 1 having an inner peripheral surface on which a tip 2 is mounted, a work is milled, a claw body 8 arranged radially movably at a cutter adapter 4 to which a cutter body 1 is attached and energized by an energizing means 9 such that a tip part is retractably protruding from the inner peripheral surface of a cutter adapter 4 is engaged with a wedge surface 8b formed on the cutter body 1 side and at the tip part of the claw body 8. At least one clamp means 7 by which the cutter body 1 is locked at the cutter adapter 4, is arranged between the cutter body 1 and the cutter adapter 4, and a mounting and demounting work for the cutter body 1 are effected in a short time, whereby work efficiency is improved and productivity is also improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutter mounting device for an internal crankshaft mirror for processing a crankshaft.

[0002]

2. Description of the Related Art Conventionally, a cutter mounting apparatus for an internal crankshaft mirror for processing a crankshaft using an inner cutter having a plurality of tips on an inner peripheral surface is disclosed in, for example, JP-A-8-118125, Kaihei 6
What is described in -5816 is publicly known.

In the cutter mounting device of the former publication, two or more splines are provided on the outer peripheral portion of the pin mirror cutter at equal intervals in the circumferential direction, and spline grooves corresponding to the splines are provided on the inner peripheral portion of the adapter. The spline and the spline groove are tapered so that the front side in the cutter insertion direction with respect to the adapter becomes gradually narrower.
It is possible to easily attach and detach the pin mirror cutter while achieving high centering accuracy without causing the fitting to be tight due to thermal expansion or the fitting to be broken due to the inclination of the cutter at the time of removal.

In the cutter mounting device disclosed in the latter publication, a key groove of the cutter body is formed in a tapered shape with respect to an axis of the cutter body 1, and a key of a cutter adapter is fitted into the key groove. Even if the cutter body is thermally expanded, the cutter body can be easily removed from the cutter adapter, so that the cutter can be easily replaced in a short time.

[0005]

However, in any of the cutter mounting apparatuses disclosed in the above publications, after the cutter body is mounted on the cutter adapter, a plurality of clamp bolts are tightened to fix the cutter body to the cutter adapter. Also, when removing the cutter body from the cutter adapter, the cutter body is removed from the cutter adapter after loosening and removing a plurality of clamp bolts. For this reason, there has been a problem that a large amount of time is required for attaching and detaching the cutter body, and the working efficiency is poor.

SUMMARY OF THE INVENTION The present invention has been made in order to improve such a conventional problem, and provides a cutter mounting device for an internal crankshaft mirror in which the work of attaching and detaching a cutter body to and from a cutter adapter can be easily performed in a short time. ,
The purpose is to improve the work efficiency and thereby the productivity.

[0007]

To achieve the above object, an invention according to claim 1 is an internal crank for milling a workpiece by rotating a cutter body having a tip mounted on an inner peripheral surface. In the shaft mirror, a claw body is provided movably in a radial direction on a cutter adapter to which the cutter body is attached, and is biased by biasing means so that a tip end protrudes and retracts from an inner peripheral surface of the cutter adapter. Clamping means formed on the cutter body side and engaging a wedge surface formed at the tip of the claw body to lock the cutter body to the cutter adapter is provided between the cutter body and the cutter adapter. At least one location is provided.

With the above structure, the cutter body is attached to the cutter adapter simply by fitting the cutter body into the cutter adapter attached to the cutter drum and pushing in the cutter body. The work of attaching and detaching the cutter body can be performed in a shorter time and more efficiently than when the cutter body is attached and detached. In addition, since the work of attaching and detaching the cutter body can be performed in a short time, the operation rate of the crankshaft mirror increases, and the productivity can be improved.

According to a second aspect of the present invention, there is provided an internal crankshaft mirror for milling a workpiece by rotating a cutter body having a chip mounted on an inner peripheral surface thereof. A claw body that is provided on the cutter adapter so as to be movable in the radial direction, and whose tip end is urged by urging means so as to protrude freely from the inner peripheral surface of the cutter adapter, and that is formed on the cutter body side; At least one clamp means for engaging the cutter body with the cutter adapter by engaging with a wedge surface formed at the tip of the claw body is provided between the cutter body and the cutter adapter. The surface opposite to the wedge surface is provided with an inclined guide surface for retracting the claw body when mounting the cutter body.

With the above arrangement, when the cutter body is fitted to the cutter adapter attached to the cutter drum and the cutter body is pushed in, the inclined guide surface provided on the claw body is pressed by the cutter body, and the tip of the claw body is pressed. The cutter body can be easily attached to the cutter adapter, and the work of attaching and detaching the cutter body takes less time compared to the case where the cutter body is attached and detached using multiple bolts. Can be performed efficiently. In addition, since the work of attaching and detaching the cutter body can be performed in a short time, the operation rate of the crankshaft mirror increases, so that productivity can be improved.

In order to achieve the above object, according to a third aspect of the present invention, an inclined guide surface for retreating the claw body when removing the cutter body is provided on a surface of the clamp means opposite to the wedge surface provided on the claw body. It is a thing.

With the above configuration, when removing the cutter body,
When the inclined guide surface of the claw body is pressed by a jig or the like, the claw body is retracted, so that the cutter body can be easily removed.

In order to achieve the above object, the invention according to claim 4 relates to an annular cutter receiving seat formed on the inner peripheral surface of the cutter adapter, and an annular concave step formed on the outer peripheral surface of the cutter body. Thus, the cutter body is attached to the cutter adapter.

According to the above configuration, the cutter body can be firmly clamped between the cutter receiving seat of the cutter adapter and the wedge surface of the claw body. Does not occur, which enables high-accuracy milling.

According to a fifth aspect of the present invention, a taper spline formed on an outer peripheral surface of a cutter body is engaged with a taper spline formed on an inner peripheral surface of a cutter adapter. The cutter body is attached to the adapter.

According to the above configuration, the cutter adapter and the cutter main body can be firmly connected to each other by the tapered spline. Therefore, the cutter main body does not vibrate during the work processing, and the chip does not chatter. High milling processing becomes possible.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described in detail with reference to FIGS. FIG. 1 is a front view of a cutter body and a cutter adapter provided with a cutter mounting device, FIG. 2 is a cross-sectional view taken along line AA of FIG. 1, FIG. 3 is a perspective view of clamping means, and FIG. FIG.

In these figures, reference numeral 1 denotes a cutter body formed in an annular shape, and a large number of chips 2 are mounted on the inner peripheral surface at intervals in the circumferential direction. The tip 2 includes a tip 2a for milling the outer peripheral surface of a pin or a journal (neither is shown) of a crankshaft and a tip 2b for milling a shoulder side surface. In addition to being detachably attached to the main body 1, a concave step portion 1 a is formed in the outer peripheral portion of the cutter main body 1 in an annular shape in the circumferential direction, and when the cutter main body 1 is fitted to the cutter An annular cutter receiving seat 4a protruding from the inner peripheral surface of the adapter 4 is fitted to the concave step portion 1a.

On the outer peripheral surface of the cutter body 1, one or a plurality of key grooves 1b tapered in the axial direction of the cutter body 1 are formed, and these key grooves 1b are provided on the cutter adapter 4 side. The key 5 is fitted. The cutter adapter 4 is also formed in an annular shape, and a plurality of mounting holes 4b for mounting the crankshaft mirror (not shown) to the cutter drum (not shown) are formed in the outer peripheral portion at equal intervals in the circumferential direction. One end of the key 5 is fixed to the portion by a fixing tool 6.

The other end of the key 5 protrudes from the inner peripheral surface of the cutter adapter 4, and the other end of the key 5 is aligned with the key groove 1 b of the cutter body 1, so that the key 5 is formed on the inner peripheral surface of the cutter adapter 4. By closely fitting the outer peripheral surface of the cutter body 1, the cutter body 1 can be positioned (aligned) with respect to the cutter adapter 4, and at the same time, when the workpiece is processed, the cutter body 1 is inserted from the cutter adapter 4 via the key 5. The rotational force can be transmitted to.

On the other hand, the cutter body 1 and the cutter adapter 4
Between them, one or a plurality of clamp means 7 for detachably fixing the cutter body 1 to the cutter adapter 4 are provided. The clamping means 7 is shown in FIGS.
As shown in FIG. 5, the claw body 8 is fitted into the concave portion 1c formed on the outer peripheral surface of the cutter body 1 and engages with the inclined locking surface 1d formed at the rising portion of the concave portion 1c. I have.

The claw body 8 is accommodated movably in the radial direction at the inner peripheral end of a guide hole 4c formed in the cutter adapter 4 in the radial direction, and accommodated at the outer peripheral end of the guide hole 4c. The cutter body 1 is urged toward the cutter body 1 by an urging means 9 comprising a compression spring. An adjusting screw 10 for adjusting the urging force of the urging means 9 is screwed into an outer peripheral end of the guide hole 4c, and an elongate hole 8a formed on the base end side of the claw body 8 is provided. The stopper pin 11 having both ends fixed to the cutter adapter 4 is inserted therethrough.
Thereby, the claw body 8 is prevented from falling out of the guide hole 4c.

The claw body 8 is protruded from the inner peripheral surface of the cutter adapter 4 on the distal end side so as to be freely protruded and retracted, and the distal end portion is engaged with a locking surface 1d formed in the concave portion 1c of the cutter body 1. A wedge surface 8b is formed, and the claw body retreating member 1 provided on the cutter replacement jig 14 on a surface opposite to the wedge surface 8b.
An inclined guide surface 8c that abuts with 4c is formed.

As shown in FIG. 4, the cutter replacement jig 14 has a handle 14b and at least a pair of support means 15 mounted on a jig body 14a on a disk slightly larger in diameter than the outer diameter of the cutter body 1. ing. The support means 15 has a support shaft 15a rotatably supported by the jig body 14a, and the cutter body 1 is provided at one end of the support shaft 15a.
A screw portion 15b that can be screwed into the screw hole 1f formed in the support shaft 15a is provided at the other end of the support shaft 15a.
Is provided.

A weight 15e is provided movably in the axial direction between the handle 15c and a large diameter portion 15d provided at an intermediate portion of the support shaft 15a. A substantially L-shaped claw body retreat member 14c is provided. One end side of the claw body retreating member 14c has the jig body 1
4a, the other end is provided so as to be parallel to the support shaft 15a, and the tip end is the inclined guide surface 8c of the claw body 8.
Is pressed to retreat the claw body 8 and a circular hole 14e opened in the jig body 14a.
A support cylinder 14f that supports the inner peripheral surface of the cutter body 1 is fixed to a peripheral portion of the cutter body 1.

Next, the operation of the above-configured cutter exchanging apparatus according to the first embodiment will be described. In attaching the cutter body 1 to the cutter adapter 4 previously attached to the cutter drum of the crankshaft mirror, First, one side of the cutter body 1 is held.
4f is fitted into the inner peripheral portion of the cutter body 1, and in this state, the handle 15c of the support means 15 is rotated, and the screw portion 15b of the support shaft 15a is screwed into the screw hole 1f of the cutter body 1.

Next, in this state, the handle 14b of the cutter exchanging jig 15 is gripped and the cutter body 1 is held substantially vertically, and the key 5 on the cutter adapter 4 and the key groove 1b of the cutter body 1 are aligned. Then, the outer peripheral surface of the cutter body 1 is fitted to the inner peripheral surface of the cutter adapter 4 and the cutter body 1 is pushed into the cutter adapter 4. As a result, the concave step portion 1a of the cutter body 1 presses the inclined guide surface 8c at the tip of the claw body 8 protruding into the inner periphery of the cutter adapter 4 to cause the tip of the claw body 8 to retreat. The surface passes through the tip of the claw body 8, and as shown in FIG. 4, the cutter receiving seat 4a of the cutter adapter 4 is engaged with the concave step portion 1a of the cutter body 1, and the claw body 8 is a claw body retreating member. It is held in a retracted state by the tip of 14c.

Next, in this state, the handle 15c of the support means 15 is
When the support shaft 15a is retracted and the claw body retreating member 14c is also retracted, the biasing force of the biasing means 9 causes the claw body 8 to enter the recess 1c on the outer periphery of the cutter body 1. As a result, the wedge surface 8b of the claw body 8 is
The outer peripheral portion of the cutter body 1 is clamped between the cutter receiving seat 4a of the cutter adapter 4 and the wedge surface 8b of the claw body 8. Thus, the cutter main body 1 can be attached to the cutter adapter 4 simply by pushing the cutter main body 1 into the cutter adapter 4, and the cutter main body 1 can be attached.
After the installation, the cutter replacement jig 14 is removed from the cutter body 1 so that the work can be processed by the cutter body 1.

Further, when the cutter body 1 is rotated together with the cutter adapter 4 and the work is milled by the tip 2 attached to the inner peripheral surface of the cutter body 1, the turning force from the cutter adapter 4 is applied to the key 5 Is transmitted to the cutter main body 1 through the rotary shaft, so that the rotational force and the cutting reaction force do not directly act on the claw body 8 of the clamp means 7.

On the other hand, to remove the cutter body 1 from the cutter adapter 4 in order to replace the cutter body 1, first, a cutter replacement jig 14 is attached to a side surface of the cutter body 1 so that the claw body of the cutter replacement jig 14 is retracted. The tip of the claw body 8 is retracted to the position shown in FIG. 4 by the insertion member 14c, and then the handle 14b of the cutter replacement jig 14 is gripped and the cutter body 1 is pulled out in this state. When the cutter main body 1 is strongly fitted to the cutter body 4 and it is difficult to pull out the cutter body 4, the weight 15e of the support means 15 is caused to strongly collide with the handle 15c to give an impact to the cutter main body 1 via the support shaft 15a. The cutter body 1 can be more easily extracted.

In the first embodiment, the key 5 provided on the cutter adapter 4 is fitted into the key groove 1a of the cutter body 1, thereby positioning the cutter body 1 with respect to the cutter adapter 4 and transmitting the torque. However, as in the second embodiment shown in FIGS. 5 to 8, the first embodiment is also applicable to a cutter device in which the cutter adapter 4 and the cutter body 1 are engaged with each other by a tapered spline. It can be implemented in the same way as the example.

Next, the second embodiment will be described. The same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. In the second embodiment, taper splines 4g, 1g tapering in the axial direction of the cutter body 1 are formed on the inner peripheral surface of the cutter adapter 4 and the entire outer peripheral surface of the cutter body 1, and these taper splines are formed. 4g,
The cutter body 1 is attached to the cutter adapter 4 by engaging 1g with each other. Clamping means 7 is provided between the cutter body 1 and the cutter adapter 4.

The clamping means 7 is, as shown in FIG.
Taper spline 1 formed on the outer peripheral surface of cutter body 1
g, for example, every other recessed part 1
c and a claw body 8 fitted into these recessed portions 1c. The concave portion 1c reaches almost half in the thickness direction from one side surface of the cutter body 1, and at the rising portion of the concave portion 1c,
A locking surface 1d that engages with a wedge surface 8b formed on the claw body 8 is formed.

Further, similarly to the first embodiment, the claw body 8 is inserted into the guide hole 4b formed on the cutter adapter 4 side.
A wedge surface which is housed movably in the radial direction of the cutter adapter 4 and is urged toward the cutter main body 1 by an urging means 9, and a tip end of the claw body 8 is engaged with the locking surface 1 d. 8b and an inclined guide surface 8c are formed.

Next, the operation of the above-configured cutter mounting apparatus according to the second embodiment will be described. First, on the side of the cutter body 1 to be attached to the cutter adapter 4,
After the cutter replacement jig 14 is attached in the same manner as in the first embodiment, the handle 14b of the cutter replacement jig 14 is gripped and the cutter body 1 is held almost vertically. 4g of tapered spline formed on
Then, the cutter body 1 is connected to the cutter adapter 4 with the tapered spline 1g formed on the outer peripheral surface of the cutter body 1 being matched.
Push in.

As a result, the convex portion 1h of the tapered spline 1g formed on the outer peripheral surface of the cutter body 1 presses the inclined guide surface 8c of the claw body 8 to retract the claw body 8, so that the convex portion 1h is 8, the taper spline 1g of the cutter body 1 and the taper spline 4 of the cutter adapter 4
g, the tip of the claw body 8 enters into the recessed portion 1c on the outer periphery of the cutter body 1 and the wedge surface 8 of the claw body 8
b engages with the locking surface 1d of the recess 1c so that the cutter body 1 does not come out of the cutter adapter 4.
Clamp.

Thus, the cutter body 1 can be attached to the cutter adapter 4 only by pushing the cutter body 1 into the cutter adapter 4, and after the cutter body 1 is attached, the cutter replacement jig is used by the cutter body 1. 14
By removing the workpiece, the workpiece can be processed by the cutter body 1.

In order to remove the cutter body 1 from the cutter adapter 4, the reverse operation to the above-mentioned attachment may be performed.

FIG. 9 shows a modification of the cutter changing jig 14. Next, when this is explained, if the urging force of the urging means 9 is increased in order to increase the clamping force of the claw body 8, the cutter changing jig 14 is changed. Even if the cutter body 1 is pushed into the cutter adapter 4 using the jig 14, the claw body 8 cannot be retracted by the claw body retreating member 14 c alone, or a large pressing force is required to retract the claw body 8. Required. Therefore, in order to increase the pressing force, an intensifying means 17 is provided in the vicinity of the supporting means 15 of the cutter exchanging jig 14, and the intensifying means 17 is a screw shaft 17 which can be screwed into a screw hole 4c provided in the cutter adapter 4.
and a handle 17b for rotating the screw shaft 17a.

When the cutter body 1 is attached to the cutter adapter 4 by the cutter exchanging jig 14, the handle 17b is rotated to screw the screw shaft 17a into the screw hole 4c of the cutter adapter 4 as shown in FIG. As a result, the cutter replacement jig 14 is attracted toward the cutter adapter 4, and the tip of the claw body retreating member 14 c of the cutter replacement jig 14 is strong.
, The claw body 8 can be retreated with a small force even if the urging force of the urging means 9 is increased.

[Brief description of the drawings]

FIG. 1 is a front view showing a cutter mounting device for an internal crankshaft mirror according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a partially cutaway perspective view showing the cutter mounting device for the internal crankshaft mirror according to the first embodiment of the present invention.

FIG. 4 is an operation explanatory view of the cutter mounting device for the internal crankshaft mirror according to the first embodiment of the present invention.

FIG. 5 is a front view showing a cutter mounting device for an internal crankshaft mirror according to a second embodiment of the present invention.

FIG. 6 is a sectional view taken along line BB of FIG. 5;

FIG. 7 is a partially cutaway perspective view showing a cutter mounting device for an internal crankshaft mirror according to a second embodiment of the present invention.

FIG. 8 is an operation explanatory view of a cutter mounting device for an internal crankshaft mirror according to a second embodiment of the present invention.

FIG. 9 is an explanatory view showing a modified example of a cutter replacement jig used for attaching and detaching the cutter body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Cutter body 1a ... Concave step part 1g ... Taper spline 2 ... Chip 4 ... Cutter adapter 4a ... Cutter receiving seat 4g ... Taper spline 7 ... Clamping means 8 ... Claw body 8b ... Wedge surface 8c ... Inclination guide surface 9 ... Biasing means

Claims (5)

[Claims] 1. An internal crankshaft mirror for milling a workpiece by rotating a cutter body (1) having a tip (2) attached to an inner peripheral surface thereof, and a cutter adapter (1) for mounting the cutter body (1). (4) a pawl body (8) movably provided in a radial direction and having a tip end urged by urging means (9) so as to protrude from the inner peripheral surface of the cutter adapter (4) so as to be freely protruded and retracted; The cutter body (1) is engaged with the cutter adapter (4) by engaging with a wedge surface (8b) formed on the cutter body (1) side and formed on the tip of the claw body (8). A cutter mounting device for an internal crankshaft mirror, wherein at least one clamp means (7) for stopping is provided between the cutter body (1) and the cutter adapter (4). 2. An internal crankshaft mirror for milling a workpiece by rotating a cutter body (1) having a tip (2) attached to an inner peripheral surface thereof, and a cutter adapter (2) for mounting the cutter body (1). (4) a pawl body (8) movably provided in a radial direction and having a tip end urged by urging means (9) so as to protrude from the inner peripheral surface of the cutter adapter (4) so as to be freely protruded and retracted; The cutter body (1) is engaged with the cutter adapter (4) by engaging with a wedge surface (8b) formed on the cutter body (1) side and formed on the tip of the claw body (8). At least one clamping means (7) for stopping is provided between the cutter body (1) and the cutter adapter (4), and the cutter body (8) is provided on the surface of the claw body (8) opposite to the wedge surface (8b). Claw for mounting (1) A cutter mounting device for an internal crankshaft mirror, comprising an inclined guide surface (8c) for retreating a body (8). 3. An inclined guide for retracting the claw body (8) when the cutter body (1) is removed from a surface opposite to the wedge surface (8b) provided on the claw body (8) of the clamping means (7). 3. The cutter mounting device for an internal crankshaft mirror according to claim 1, further comprising a surface (8c). 4. A cutter body (1) is provided on an annular cutter receiving seat (4a) formed on an inner peripheral surface of a cutter adapter (4).
The internal crankshaft according to claim 1 or 2, wherein the cutter body (1) is attached to the cutter adapter (4) by engaging an annular concave step (1a) formed on the outer peripheral surface of the internal crankshaft. Mirror cutter mounting device. 5. A cutter is formed by engaging a taper spline (1g) formed on an outer peripheral surface of a cutter body (1) with a taper spline (4g) formed on an inner peripheral surface of a cutter adapter (4). 3. The cutter mounting device for an internal crankshaft mirror according to claim 1, wherein the cutter body (1) is mounted on the adapter (4).