JP3188101B2 - Recessing spindle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recessing spindle for circumferentially grooving or chamfering the inner peripheral surface of a circular hole formed in a metal work.

[0002]

2. Description of the Related Art In drilling a differential gear mounting hole of a transmission case of an automobile, a groove for forming a snap ring fitting groove is formed in a circumferential direction of an inner peripheral surface of a circular hole to be processed. . For grooving the inner surface of a hole in a work such as a transmission case, a recessing tool with a cutting tool protruding from the outer periphery is inserted eccentrically into the hole to be processed, and the resizing tool is inserted into the center line of the hole to be processed. In many cases, the processing is performed by a reversing spindle rotating and swinging around the center. A conventional example of such a recessing spindle will be described with reference to FIGS. 4 to 6 and FIG.

[0003] The re-processing spindle shown in FIGS. 4 to 6 is mounted on a boring head 30 which moves toward and away from the work 1. The resetting spindle is eccentrically fitted on a cylindrical oscillating spindle 31 having a cylindrical recessing tool 4 having a cutting tool 3 protruding on the outer periphery and coaxially integrated with the tip thereof, and eccentrically mounted on the outer periphery of the oscillating spindle 31. Cylindrical slide spindle 32, a cylindrical rotary spindle 33 and a ring-shaped rotary bush 34 coaxially fitted around the outer periphery of the slide spindle 32.
And a coil-shaped spring member 35 built in the swing spindle 31.

[0004] The recessing tool 4 is used for simultaneously grooving two inner peripheral surfaces of the hole 2 to be machined of the work 1.
The cutting tool 3 is protruded at two locations in the axial direction on the outer periphery. Byte 3
As shown in FIG. 6B, for example, is inserted through a bite hole 36 penetrated through the recessing tool 4 in the diameter direction and fixed with screws 37.

The rotary spindle 33 is rotatably supported by a pair of left and right bearings 38 on the boring head 30, and is rotated by a rotary drive source (not shown) by rotating a gear 39 coaxially projecting from the rear end of the rotary spindle 33. , The rotating spindle 33 rotates about its center line. The slide spindle 32 is inserted into the inner periphery of the rotary spindle 33 so as to be slidable only in the axial direction by fitting the key 40 and the key groove 41.
The slide spindle 32 rotates integrally with the rotary spindle 33 by the engagement between the key 40 and the key groove 41. A rotary bush 34 is fitted in a fixed position on the outer periphery of the slide spindle 32 in front of the rotary spindle 33 so as to be rotatable in the circumferential direction.

The swing spindle 31 is eccentrically inserted into the slide spindle 32 so as to be relatively rotatable in the circumferential direction. As shown in FIG. 6A, the slide spindle 3
2 and the center point Q of the oscillating spindle 31 are distance L
The rotary spindle 33 and the slide spindle 32 rotate about a common center point P, and the swing spindle 31 swings about the center point P by this rotation.

A connecting pin 42 is fixed to a fixed portion of the front end of the rotary spindle 33 projecting from the boring head 30. The connecting pin 42 passes through a clearance hole 43 whose central portion is formed in the slide spindle 32 in the shape of an elongated hole in the axial direction, and has a circular tip portion formed in a lead groove 44 formed in the swing spindle 31 in a spiral shape in the circumferential direction. Slidably engage. When the swing spindle 31 is moved back and forth in the axial direction with respect to the slide spindle 32, the connecting pins 4 move along the lead grooves 44.
2 slides, and the oscillating spindle 31 rotates around its center point Q with respect to the slide spindle 32. Also,
When the slide spindle 32 rotates, the swing spindle 31 rotates and swings about the center point P of the slide spindle 32 due to the engagement between the lead groove 44 and the connection pin 42.

A spring retainer 45 is axially slidably fitted in the rear end of the opening of the swing spindle 31, and a spring material 35 is compression-inserted between the spring retainer 45 and the resetting tool 4 at the tip of the swing spindle 31. Is done. The spring retainer 45 is fixed to the center of the rear end of the rotary spindle 33.

The processing spindle of FIG. 4 operates as follows. As shown in FIG.
Is advanced, the recessing tool 4 is eccentrically inserted into the hole 2 to be machined of the work 1, and the rotary bush 34 is
To determine the insertion position of the re-processing tool 4 in the hole 2 to be machined. Recessing tool 4 at this time
As shown by a chain line in FIG. 6B, the cutting tool 3 is held at a predetermined angular position away from the inner periphery of the hole 2 to be machined.

When the boring tool 4 is further advanced to advance the rotary spindle 33 and the spring retainer 45, the spring material 35 is compressed and the connecting pin 42 advances through the relief hole 43 of the slide spindle 32 as shown in FIG. Then, the lead groove 44 of the oscillating spindle 31 is pressed forward in the axial direction. With this pressing, a rotational torque is applied to the oscillating spindle 31, and the oscillating spindle 31 rotates around its center point Q. When the oscillating spindle 31 rotates by the angle α as shown by the solid line in FIG. 6B, the tip of the cutting tool 3 comes into contact with the inner peripheral surface of the hole 2 to be machined.

The rotary spindle 33 is driven to rotate before and after the rotation of the swing spindle 31. Then, the three members of the rotating spindle 33, the slide spindle 32, and the swing spindle 31 integrally rotate around the center point P,
The tip of the cutting tool 3 of the re-processing tool 4 abutting on the inner peripheral surface of the hole 2 rotates around the center line of the hole 2 to form a groove in the inner peripheral surface of the hole 2 in the circumferential direction. To form.

When the grooving is completed, the boring head 30 is retracted. While the boring head 30 is retracted to the position shown in FIG.
Is pressed by the work 1, and the position of the recessing tool 4 in the hole 2 to be processed is maintained constant. During this time, the connecting pin 42 of the rotating spindle 33 that is retracted moves the swing spindle 3
1 is moved backward through the lead groove 44 of the swing spindle 31.
Is rotated in the direction opposite to the rotation direction before the groove cutting, and the tip of the cutting tool 3 is separated from the inner peripheral surface of the hole 2 to be processed. Thereafter, the recessing tool 4 comes out of the hole to be processed 2 by retreating the boring head 30.

The recessing spindle shown in FIG. 7 uses a cylinder 50 to rotate the reversing tool 4 inserted eccentrically to a fixed position in the hole 2 to be processed of the work 1 in both the forward and reverse directions. The resetting spindle comprises a cylindrical oscillating spindle 51 having a processing tool 4 coaxially and integrally at its tip, a cylindrical rotary spindle 52 eccentrically fitted on the outer periphery of the oscillating spindle 51, and an oscillating It comprises a spindle shaft 53 slidably fitted on the inner periphery of the spindle 51 and a cylinder 50 for moving the spindle shaft 53 back and forth in the axial direction.

A connecting pin 54 is detachably screwed to the distal end of the spindle shaft 53 in the diametrical direction. Connecting pin 54
A head 54a protruding from the outer periphery of the spindle shaft 53 has a lead groove 5 formed in the swing spindle 51 in a spiral shape in the circumferential direction.
5 is slidably fitted to the key groove 56 formed in the axial direction of the inner peripheral surface of the rotary spindle 52 so as to be slidable in the axial direction.

The front and rear ends of the rotary spindle 52 are rotatably supported by the boring head 30 by bearings 57, and a gear 58 for rotating the rotary spindle 52 is fixed to the outer periphery of the rear end of the rotary spindle 52. Boring head 30
The cylinder 50 is fixed at a fixed position behind the rotary spindle 52.

The processing spindle of FIG. 7 performs the following operation. The boring head 30 is advanced toward the work 1, and the recessing tool 4 is eccentrically inserted into the hole 2 to be processed of the work 1 and inserted to a predetermined position. At this time, the rotation center line of the rotary spindle 52 is made to coincide with the center line of the hole 2 to be processed. The spindle shaft 53 is advanced by the cylinder 50, and the head 54 a of the connecting pin 54 is slid into the lead groove 55 of the swing spindle 51, and the swing spindle 51 is moved.
To rotate. The tip of the cutting tool 3 comes into contact with the inner peripheral surface of the hole 2 to be processed by the rotation of the swing spindle 51. When the rotary spindle 52 is driven to rotate, the rotational torque is applied to the connecting pin 5.
The rotation is transmitted directly to the oscillating spindle 51 and the spindle shaft 53 at 4, and the rotating spindle 52, the oscillating spindle 51, and the spindle shaft 53 are integrally rotated about the center line of the hole 2 to be machined.

When the grooving of the inner peripheral surface of the hole 2 is completed by the swinging rotation of the recessing tool 4 eccentric in the hole 2, the spindle 50 is moved backward by the cylinder 50. The head 54 of the connecting pin 54 is
a retreats in the lead groove 55 of the oscillating spindle 51, the oscillating spindle 51 rotates in the reverse direction, and the tip of the cutting tool 3 separates from the inner peripheral surface of the hole 2 to be machined.

[0018]

SUMMARY OF THE INVENTION FIG.
When the spring member 35 is used as a power source for rotating the resetting tool 4 and the oscillating spindle 31 like a spindle, a resetting operation failure due to a malfunction of the spring member 35 may occur, and there is a problem in reliability. there were. For example, when the boring head 30 is retracted after the inner peripheral surface of the hole 2 to be processed is grooved by the cutting tool 3 inserted eccentrically into the hole 2 to be processed of the work 1, the cutting tool Since the spring force of the spring material 35 for rotating the rotating member 4 in the reverse direction is weak, the recessing tool 4 does not rotate in the reverse direction, and the tip of the cutting tool 3 does not sufficiently separate from the inner peripheral surface of the hole 2 to be machined. In the case of occurrence of this problem, the tip of the cutting tool 3 rubs the inner peripheral surface of the processing hole 2 when the recessing tool 4 is extracted from the processing hole 2,
Troubles have occurred in which the tip of the cutting tool 3 is damaged or the inner peripheral surface of the hole 2 to be machined is damaged.

The resetting spindle shown in FIG. 7 achieves high reliability by forcibly rotating the resetting tool 4 by the cylinder 50 to ensure the resetting operation. However, the processing shown in FIG.
In the case of a spindle, the rotating spindle 52 and the spindle shaft 53 are connected by a connecting pin 54 so as not to rotate relative to each other in the circumferential direction, and the swing spindle 51 and the spindle shaft 53 are connected so as to be relatively rotatable in the circumferential direction. The connecting pin 54 enters the rotary spindle 52, and there is a maintenance problem that the replacement operation of the connecting pin 54 is very troublesome.

That is, the connecting pin 54 is
In the axial movement, the lead groove 55 of the oscillating spindle 51 is slid to rotate the oscillating spindle 51, and the rotational torque of the rotating spindle 52 is transmitted to the spindle shaft 53 and the oscillating spindle 51. , Replaced regularly or as needed. However, since the connecting pin 54 is located inside the rotary spindle 52, replacing the connecting pin 54 requires disassembling the entire processing spindle. This replacement requires a great deal of time and effort.

In the recessing spindle shown in FIG. 7, the structure between a pair of bearings 57 for supporting the rotary spindle 33 on the boring head 30 is different from that of the rotary spindle 33.
Has a triple spindle structure in which the oscillating spindle 31 and the spindle shaft 53 are inserted, so that if the thickness of each spindle is increased to provide high steel properties, the entire diameter increases, and the entire diameter increases. If the thickness of each spindle is reduced in order to reduce the diameter, the steel becomes poor, bending occurs at the time of operation, etc., and the processing operation may become uncertain,
There was a problem that the spindle design was difficult.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a recessing spindle which has a reliable reversing operation and is easy to design and maintain.

[0023]

According to the present invention, a recessing tool having a cutting tool protruding from the outer periphery is inserted eccentrically into a circular hole to be processed formed in a workpiece, and the recessing tool is centered on its center line. A cutting spindle is used to machine the inner peripheral surface of the hole to be processed by rotating the resizing tool around the center line of the hole to be processed by rotating the cutting tool on the inner peripheral surface of the hole to be processed. The above object is achieved by using the following oscillating spindle, rotary spindle, slide spindle, and cylinder.

That is, according to the present invention, there is provided a swing spindle having a recessing tool coaxially and integrally with a tip thereof, an eccentric distance of an eccentric distance between the swing spindle and a hole to be processed, inserted into the outer periphery of the swing spindle, Supports the spindle so that it can rotate in the circumferential direction, and can slide in the axial direction between the rotating spindle and the rear end of the rotating spindle that rotates around the center line of the hole to be machined. The rotatable spindle is inserted into the rotatable spindle so as to be relatively rotatable in the circumferential direction and is rotatable integrally with the rotatable spindle. A slide spindle having a circumferential spiral lead groove into which the connected connecting pin is slidably inserted, and a cylinder for moving the slide spindle back and forth in the axial direction. By moving the slide spindle back and forth with respect to the oscillating spindle by the cylinder, the connecting pin is slid in the lead groove of the oscillating spindle to cause the oscillating spindle to rotate in both forward and reverse directions.

[0025]

The main part which requires high steel between the front and rear ends of the rotary spindle has a double structure consisting only of the rotary spindle and the oscillating spindle. The thickness of the spindle in this part is increased to increase the steel quality. However, the diameter does not increase as a whole. Also, a connecting pin is provided at the rear end of the oscillating spindle that protrudes from the rear end of the rotary spindle, and the connecting pin is inserted into the lead groove of the slide spindle, so that the connecting pin can be seen from outside the rotary spindle, In other words, the connecting pin is located at a place where the pin can be manually replaced from the outside, and the replacing work of the connecting pin can be performed easily and in a short time.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment will be described below with reference to FIGS.

The resetting spindle shown in the embodiment of FIG. 1 employs a cylinder driving system in which a recessing tool 4 inserted eccentrically into a circular hole 2 of a workpiece 1 is inserted, similarly to the recessing spindle of FIG. It is made to rotate. The resetting spindle shown in FIG. 1 includes a cylindrical oscillating spindle 5 having a recessing tool 4 coaxially and integrally at its tip, a cylindrical rotary spindle 6 eccentrically fitted around the oscillating spindle 5, It comprises a cylindrical slide spindle slidably fitted between the swing spindle 5 and the rear end of the rotary spindle 6, and a cylinder 10 for moving the slide spindle 7 back and forth in the axial direction.

The rotary spindle 6 has a pair of left and right bearings 1 attached to a boring head 11 that moves toward and away from the workpiece 1.
2 is rotatably supported. A gear 13 is fixed coaxially to the outer periphery of the rear end of the rotary spindle 6. Boring head 1
1, a pulley 14 and a gear mechanism 15 as a rotary drive source are incorporated, and the pulley 14 is rotated by an external motor or the like to rotate the gear 13 via the gear mechanism 15, so that the rotary spindle 6 shifts its center line. Drive around the center.

The swing spindle 5 is inserted into the eccentric inner periphery of the rotary spindle 6. The swing spindle 5 has a length whose rear end 5 ′ protrudes from the rear end of the rotary spindle 6, and a connecting pin 8 protrudes from the outer periphery of the protruding rear end 5 ′. The rear end 5 'of the oscillating spindle 5 and the rotating spindle 6
The slide spindle 7 is inserted between the rear ends of the slide spindles. A circumferential spiral lead groove 9 is formed in the slide spindle 7, and the connecting pin 8 is slidably fitted in the lead groove 9.

As shown in FIGS. 2 and 3, the slide spindle 7 and the oscillating spindle 5 are eccentrically inserted into the rotary spindle 6, and the slide spindle 7 and the oscillating spindle 5 are inserted.
Is inserted so as to be relatively slidable only in the axial direction by fitting the key 16 and the key groove 17 in the axial direction. The connecting pin 8 is detachably attached to the rear end 5 ′ of the swing spindle 5. For example, as shown in FIG.
A small-diameter portion 8a inserted into the pin hole 18 penetrated in the diameter direction, and a circular large-diameter portion 8b locked at one end of the pin hole 18
The connecting pin 8 is exchangeably fixed to the swing spindle 5 by screwing a screw 20 from the concave portion 19 formed at the other end of the pin hole 18 through the washer 21 into the small diameter portion 8a. .

The cylinder 10 is arranged at a fixed position behind the slide spindle 7 of the boring head 11, and the tip of a piston rod 10 ′ of the cylinder 10 is fixed to the rear end of the slide spindle 7. A gear cover 22 for protecting the internal gear mechanism 15 and the like is mounted on the boring head 11. An opening 23 through which the internal slide spindle 7 can be seen is formed in a part of the gear cover 22. The opening 23 is
As an inspection window for repair inspection inside the boring head 11,
Alternatively, it is used as a connection pin replacement work window as described later.

The drilling operation of the resetting spindle of FIG. 1 is basically the same as the operation of the resetting spindle of FIG. That is, as shown in FIG. 1, the boring head 11 is advanced toward the work 1, and the recessing tool 4 is eccentrically inserted into the circular processed hole 2 of the work 1 and inserted to a predetermined position. When the cylinder 10 is operated in the state shown in FIG. 1 and only the slide spindle 7 is advanced, as shown in FIG. 2, the lead groove 9 presses the connecting pin 8 and the swing spindle 5 and the recessing tool 4 Revolving around the center line, cutting tool 4
Corresponds to the inner peripheral surface of the hole 2 to be machined.

When the rotary spindle 6 is driven to rotate before and after the rotation of the recessing tool 4, the rotational torque is swung by the key 16 and the key groove 17 to the slide spindle 7, and further by the lead groove 9 and the connecting pin 8. The rotation is transmitted to the spindle 5, and the rotating spindle 6, the slide spindle 7, and the swing spindle 5 are integrally rotated about the center line of the hole 2 to be processed, and the cutting tool 3 of the processing tool 4 is rotated.
The groove is formed on the inner peripheral surface of the hole 2 to be processed.

When the grooving of the inner peripheral surface of the hole 2 to be processed is completed, the slide spindle 7 is retracted by the cylinder 10 and the connecting pin 8 is slid into the lead groove 9 by this retraction to reset the swing spindle 5 with the swing spindle 5. The sing tool 4 is rotated in the reverse direction, and the tip of the cutting tool 3 is separated from the inner peripheral surface of the hole 2 to be processed. Thereafter, the boring head 11 is retracted, and the recessing tool 4 is separated from the work 1.

In the recessing spindle shown in FIG. 1, the central part of the steel between the bearings 12 at the front and rear ends of the rotary spindle 6 which is supported by the boring head 11 is formed of only the rotary spindle 6 and the oscillating spindle 5. It has a double spindle structure. For this reason, the outer diameter of the rotary spindle 6 is made approximately the same as the conventional one to increase the wall thickness, or the bearing 12 supporting the rotary spindle 6 is designed to have a large wall thickness to increase the steel quality of the recessing spindle. In addition, it is possible to reduce the outer diameter by setting the thickness of the rotary spindle 6 to a conventional level, thereby simplifying the spindle design.

Also, by forming an opening 23 through which the slide spindle can be seen in the gear cover 22 of the boring head 11 equipped with a recessing spindle,
The lead groove 9 and the connecting pin 8 of the slide spindle 7 can be seen through the opening 23, and the connecting pin 8 can be replaced manually by using the opening 23. When the connecting pin 8 is attached to the oscillating spindle 5 with a screw 20 as shown in FIG. 3, the head 20a of the screw 20 is made hexagonal, and the head 20a is opposite to the lead groove 9 of the slide spindle 7 by 180 °. The work hole 24 is formed by the portion 20a to be viewed.
4 and loosen the head 20a of the screw 20 with a tool,
Can be exchanged.

[0037]

According to the present invention, the main part which requires high steel between the front and rear ends of the rotary spindle has a double spindle structure consisting of only the rotary spindle and the oscillating spindle. Without increasing the size, it is possible to increase the wall thickness of the rotary spindle and the bearings supporting the rotary spindle to enhance the steel properties, thereby providing a highly reliable resetting spindle with high steel properties and stable operation.

Further, since the connecting pin protruding from the rear end of the swing spindle protruding from the rear end of the rotary spindle is inserted into the lead groove of the slide spindle, the connecting pin can be exchanged directly from outside the rotary spindle. Thus, it is possible to provide a simple resetting spindle that can be manually performed, greatly reducing the time required for pin replacement and reducing labor.

[Brief description of the drawings]

FIG. 1 is a side view including a partial cross section showing one embodiment of the present invention.

FIG. 2 is a partially enlarged side view including a partial cross section during operation of the recessing spindle of FIG. 1;

FIG. 3 is an enlarged sectional view taken along the line AA of FIG. 2;

FIG. 4 is a side view including a partial cross section of a conventional processing spindle.

FIG. 5 is a partial cross-sectional view of the resetting spindle shown in FIG. 4 during operation.

FIG. 6A is an enlarged cross-sectional view taken along the line B-B of FIG. 5;
FIG. 5B is an enlarged cross-sectional view along the line CC in FIG. .

FIG. 7 is a side view including a partial cross section of another conventional processing spindle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Work 2 Hole to be machined 3 Bit 4 Recessing tool 5 Swing spindle 6 Rotating spindle 7 Slide spindle 8 Connecting pin 9 Lead groove 10 Cylinder

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B23B 39/00 B23B 29/034

Claims (1)

(57) [Claims] 1. A cutting tool having a cutting tool protruding from the outer periphery is inserted eccentrically into a circular hole to be formed in a workpiece, and the cutting tool is rotated around its center line to process the cutting tool. A resetting spindle that processes the inner peripheral surface of a hole to be processed by rotating the recessing tool around the center line of the hole to be processed and gradually rotating the retooling tool as it hits the inner peripheral surface of the hole. An oscillating spindle having a tool coaxially integrated at the tip, and an eccentric distance between the oscillating spindle and the hole to be machined, which is inserted around the oscillating spindle and rotatably supports the oscillating spindle in its circumferential direction. In addition, a cylindrical rotating spindle that rotates around the center line of the hole to be machined, and an oscillating spindle that can slide axially between the oscillating spindle and the rear end of the rotating spindle Is connected to the rotary spindle so as to be relatively rotatable in the circumferential direction, and to the rotary spindle so as to be integrally rotatable. A slide spindle having a circumferential spiral lead groove slidably inserted therein and a cylinder for moving the slide spindle back and forth in the axial direction are provided, and the slide spindle is moved back and forth with respect to the swing spindle by the cylinder. A reversing spindle, characterized in that the connecting pin is slid in the lead groove to rotate the oscillating spindle.