JPH09267243A - Crankpin phase-indexing device and phase-indexing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain size reduction and cost reduction in the whole device by arranging a phase-modulating shaft which rotates a crankshaft and indexes of a phase of crankpins different in a phase angle, and connecting a phase indexing shaft rotated by a phase-indexing motor to this. SOLUTION: In the case of indexing a phase of crankpins 40 to 42 of a crankshaft 34, in a condition where both main shaft driving motors 51 and 52 are stopped, a phase-indexing shaft 65 is rotated by a prescribed angle by a phase-indexing motor 67. Therefore, the phase-indexing shaft 65, a phase- modulating shaft 55 and an indexing plate 56 are rotated for indexing to chuck main bodies 26 and 27, and the crankshaft 34 is rotated for indexing with the second axis αas the center, and either of crankpins 40 to 42 is arranged for indexing in a work position on the same axis as the first axis αof main shafts 23 and 24. According to the completion of indexing, an engaging body of a cylinder 60 is engaged with an engaging groove of the indexing plate 56, and the indexing plate 56 is positioned and held at a prescribed indexing angle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crankpin phase indexing device and a phase indexing method embodied in a crankpin grinder for grinding or polishing a crankpin of a crankshaft. is there.

[0002]

2. Description of the Related Art Generally, in this type of crank pin phase indexing device,
Main shafts are rotatably supported by a pair of headstocks on the same axis, and chucks for holding both end journals of the crankshaft at positions separated from the main shaft axis are attached to opposite ends of both main shafts. . A spindle drive motor is connected to each of the pair of spindle stocks, and the spindle is driven to rotate by each spindle drive motor, and the crankshaft is rotated around a crankpin located on the same axis as the spindle. The outer peripheral surface of is processed for grinding or polishing by a rotating grindstone.

Further, a crank pin phase indexing device having a phase indexing motor and a phase indexing shaft is provided on one chuck side, and the crankshaft is rotated by indexing rotation of the phase indexing shaft by the phase indexing motor. The crank pin is rotated about the journal, and the crank pins having different phases on the crank shaft are selectively arranged at the machining position on the axis of the main shaft.

In such a crank pin phase indexing device, at the time of phase indexing, only the phase indexing shaft is rotated while the main shaft is stopped. Further, during the machining operation, it is necessary to rotate the phase indexing shaft together with the main shaft so that the phase indexing shaft maintains a fixed relationship with the main shaft.

Therefore, as a conventional phase indexing device, a complicated planetary gear mechanism is interposed between a main shaft and a phase indexing shaft, as disclosed in, for example, Japanese Patent Application Laid-Open No. 7-60623. By the action of the planetary gear mechanism, two modes of the phase indexing of the phase indexing shaft and the machining operation can be selected.

However, this conventional phase indexing device has a problem that the structure is complicated due to the planetary gear mechanism consisting of a large number of gears, the entire device is large, and the manufacturing cost is high. In addition, the gears in the planetary gear mechanism generate gear rattling noise and the like, resulting in large noise and not only deteriorating the working environment of the crank pin machining,
There is also a problem that accuracy is deteriorated due to wear of gears and maintenance such as oil supply to gears is required.

By the way, when the crankshaft is changed to one having a different half stroke, in other words, one having a different crank arm length, the chuck is moved and adjusted so that the axis of the main shaft and the axis of the chuck are adjusted. The distance between and is changed. In order to allow this distance change, an expandable joint, for example, a Schmidt coupling 201 as shown in FIG. 11, is provided between the main shaft and the chuck.

The Schmidt coupling 201 rotates integrally with the main shaft on the same axis as the drive coupling plate 202, the intermediate coupling plate 203, and the chuck on the same axis as the chuck. Driven coupling plate 204
And The intermediate coupling plate 203 is connected on one side to the drive coupling plate 202 via a link 205 and on the other side to a driven coupling plate 204 via a link 206.

As shown in FIG. 12, the center α of the drive coupling plate 202 and the center β of the driven coupling plate 204 connected to the drive coupling plate 202 via the intermediate coupling plate 203 are defined by , The Schmid coupling 201 is located on the vertical line γ in the expansion / contraction direction.

Usually, in such a Schmidt coupling 201, the minimum specified value δ is set as an unstable region in the approach distance between the centers α and β, and both centers α and β are set.
Beta is designed not to be shorter than this value δ. Therefore, in the conventional configuration as shown in FIG. 12, when the axial distance ε between the main shaft and the chuck is expanded or contracted in response to the change of the half stroke of the crankshaft, the Schmidt coupling 201 is expanded and contracted. Is restricted in the range that can follow.

That is, the first axis α which is the axis of the main shaft.
The distance ε between the second axis β which is the axis of the chuck axis cannot be made smaller than the value corresponding to the minimum specified value δ. Therefore, the driven coupling plate 204 is different from the drive coupling plate 202 in
The limit is that it is moved closer to the position θ shown by the chain double-dashed line in FIG. 12, and the stroke change cannot be dealt with for the crankshaft whose half stroke is smaller than the value δ.

Further, in this type of crankshaft grinder, since the rigidity of the crankpin as a work is generally low, it is necessary to rotate the crankshaft so that the crankshaft is not twisted during machining. Therefore, there has been conventionally proposed a synchronous drive device in which both main shafts are operatively connected by a synchronous shaft, and the both main shafts are synchronously rotated via the synchronous shaft.

However, in this conventional synchronous drive device, both main shafts must be accurately rotated synchronously via the synchronous shaft, so that a troublesome adjustment operation such as removing the backlash of the rotary connecting portion is required. It was necessary to use a large diameter synchronous shaft so that the synchronous shaft itself is not twisted. In addition, there is a risk that the rotary drive system may rattle due to wear or the like due to long-term use of the device, and both spindles may not rotate accurately in synchronization.

In order to deal with such a situation, there has been conventionally proposed a synchronous drive device in which motors are separately operatively connected to both spindles and the motors are synchronously controlled. However, in this conventional device, there is a possibility that a synchronous rotation abnormality may occur between the two motors due to the modulation of the control system of the one motor or the like. When the synchronous rotation abnormality occurs in this way, the crankshaft is twisted and the machining accuracy is reduced.

In order to solve such a problem, a synchronous drive device having a structure as disclosed in Japanese Utility Model Publication No. 7-23945, for example, has been conventionally proposed. In this conventional configuration, both main shafts are configured to be synchronously rotated by a pair of motors, and a safety shaft is rotatably coupled between the main shafts on an axis different from the axis of the main shaft. When an abnormality occurs in the synchronous control due to a motor failure or the like, the rotation is transmitted from one main shaft to the other main shaft through the safety shaft to prevent excessive twisting of the crankshaft. It has become.

That is, in this conventional synchronous drive device,
When a synchronization deviation occurs between the two spindles due to modulation of the motor control system, etc., the rotational force of one spindle forces the other spindle to be forced through the safety axis to mechanically synchronize the two spindles. To secure. Therefore, when the synchronization shift occurs, the security shaft takes charge of torque transmission, and a thick and sturdy security shaft is required. For this reason,
Even in a normal state in which the safety axis becomes excessively heavy and the safety axis does not perform its function, the heavy safety axis wastes the power of the motor, resulting in energy loss.

Furthermore, when a synchronization deviation occurs between the two main shafts due to modulation of the control system of one motor, drive torques of different values act on both ends of the crankshaft, and the safety in this state is maintained. The crankshaft is twisted by the forced rotation of the shaft. If the processing is continued in this twisted state, the processing accuracy may be significantly reduced.

The present invention has been made in view of such problems existing in the prior art. The purpose is that the structure is simple and the entire device can be downsized, and the manufacturing cost can be reduced.
Moreover, it is an object of the present invention to provide a crank pin phase indexing device and a phase indexing method that can suppress noise, maintain high precision machining, and facilitate maintenance.

[0019]

In order to achieve the above object, in the invention of a crank pin phase indexing device according to a first aspect of the present invention, the crank pin phase indexing device is arranged on the first axis so as to be spaced apart and opposed to each other, and is synchronously controlled. A pair of spindles that are respectively rotated by a pair of spindle drive motors, a chuck body provided at the tip of each spindle, and a chuck axis provided on each chuck body and separated from the first axis. A chuck portion for holding both end journals of the crankshaft on a second axis parallel to the crankshaft, and a chuck portion rotatably provided on the second axis of at least one of the chuck bodies and engaging with an end surface of the crankshaft. A phase conversion shaft for rotating the shaft and phase-indexing crankpins having different phase angles on the first axis; and a phase conversion shaft connected to the phase conversion shaft and concentric with the main shaft, A first mode in which the phase conversion shaft is rotated by a phase indexing motor, and the phase conversion shaft is synchronously rotated at the same speed as the pair of main shafts; and the phase conversion shaft is a relative speed with respect to the pair of main shafts. A control means for controlling the operations of the phase indexing motor and the both spindle drive motors is provided so that the second mode in which the synchronous rotation is performed with a difference is executed.

According to a second aspect of the present invention, in the crankpin phase indexing device according to the first aspect, at least one main shaft has a hollow shape, and the phase indexing shaft is arranged in the main shaft. Is.

According to a third aspect of the present invention, in the crankpin phase indexing device according to the first or second aspect, the phase conversion shaft is provided with a plurality of positioning portions corresponding to indexing angles, and the chuck body is provided. A holding member is provided which releasably engages with the positioning portion of the phase conversion shaft and holds the phase conversion shaft at a predetermined indexing angle.

According to a fourth aspect of the present invention, in the crankpin phase indexing device according to the third aspect, in the first mode, when the phase indexing motor is stopped, the phase conversion shaft is interposed via the holding member. The spindle is rotated integrally with the chuck body as the spindle rotates.

According to the invention of claim 5, claims 1 to 4
In the crank pin phase indexing device according to any one of items 1 to 5, an expansion joint capable of changing the axial distance between the phase conversion shaft and the phase indexing shaft is interposed.

According to a sixth aspect of the present invention, in the crankpin phase indexing device according to the fifth aspect, the expansion joint is located between the driving side coupling plate, the driven side coupling plate, and between them. It is composed of an intermediate coupling plate and a Schmidt coupling including a link interposed between the coupling plates, and the drive coupling plate and the phase indexing shaft are gear-connected to each other, and the center position of the drive coupling plate is formed. Is deviated from the center of the phase indexing axis in a direction orthogonal to the coupling expansion / contraction direction by a predetermined amount.

According to a seventh aspect of the invention, in the crankpin phase indexing device according to the fifth or sixth aspect, the chuck body is arranged such that the distance between the first axis and the second axis expands and contracts. The position is adjustable with respect to the main shaft.

In the invention described in claim 8, claims 1 to 7 are provided.
In the crank pin phase indexing device according to any one of 1 above, a detection shaft is connected and arranged between the motor shafts of both main shaft drive motors, and when a rotation synchronization deviation occurs between the motor shafts of the detection shaft. A detecting means for detecting this and stopping the both spindle drive motors is provided.

According to a ninth aspect of the invention, in the crankpin phase indexing device according to the eighth aspect, the detection shaft is
It is arranged on another axis parallel to the axis of the main shaft and the axis of the chuck body.

According to a tenth aspect of the invention, in the crankpin phase indexing device according to the eighth or ninth aspect,
The detection shaft is divided into two parts, and a clutch that causes slippage when a synchronization deviation occurs between the two main shafts is interposed between the divided parts, and the detection means detects slippage of the clutch. Then, the motor is stopped.

In the invention of the crankpin phase indexing method according to the eleventh aspect, a pair of main shafts, which are arranged on the first axis and are opposed to each other at a distance, are rotated by a pair of main shaft drive motors which are controlled in synchronization with each other. And a chuck body provided at the tip of each spindle and a second chuck body provided on each chuck body and spaced apart from the first axis and parallel to the first axis.
A chuck portion for gripping both end journals of the crankshaft on the axis of, and rotatably provided on the second axis of at least one chuck body, and engages with the end surface of the crankshaft to rotate the crankshaft, A phase conversion shaft for phase indexing crankpins having different phase angles on the first axis according to processing, and a phase conversion motor connected to the phase conversion shaft and concentrically arranged with the main shaft. In the crank pin phase indexing device having a phase indexing shaft rotated by the control means, the operation of the phase indexing motor and the both spindle drive motors is controlled by the control means, and the first mode is executed during the machining operation. The phase conversion shaft is synchronously rotated at the same speed as the pair of main shafts, and the second mode is executed at the time of phase indexing so that the phase conversion shaft is moved relative to the pair of main shafts. It is obtained so as to rotate synchronously with.

According to the twelfth aspect of the invention, in the crankpin phase indexing method according to the eleventh aspect, in the first mode, the phase indexing motor and the both spindle drive motors are synchronously driven. is there.

According to the thirteenth aspect of the present invention, in the crankpin phase indexing method according to the eleventh aspect, the phase conversion shaft is held by the holding member at a predetermined indexing angle with respect to the chuck body. In the first mode, when the phase indexing motor is stopped, the phase conversion shaft is rotated integrally with the chuck body along with the rotation of the main shaft via the holding member.

According to the fourteenth aspect of the present invention, in the crankpin phase indexing method according to any one of the eleventh to thirteenth aspects, in the second mode, the phase indexing motor is operated with both spindle drive motors stopped. Is to rotate.

According to a fifteenth aspect of the present invention, in the crankpin phase indexing method according to any one of the eleventh to thirteenth aspects, in the second mode, when the both spindle drive motors are rotating, the both spindle drive is performed. The rotational speed of at least one of the motor and the phase indexing motor is changed to give a relative speed difference therebetween.

Therefore, according to the invention described in claims 1, 11, 12, 14 and 15, the machining operation and the indexing can be performed by switching the mode without using a complicated planetary gear mechanism. Simpler configuration.

According to the second aspect of the invention, the phase indexing shaft is located in the main shaft, so that the size can be reduced. According to the invention described in claims 3, 4 and 13, the positioning of the phase conversion shaft can be directly performed by mechanical engagement.

According to the invention described in claim 5, the expansion joint can cope with the change of the half stroke amount of the crankshaft. According to the invention described in claim 6, the Schmidt coupling can be expanded and contracted without being restricted by the minimum specified value of the unstable region of the Schmidt coupling.

According to the seventh aspect of the invention, the distance of the chuck center of the chuck body with respect to the axis of the main shaft can be adjusted. According to the invention described in claim 8, when abnormalities occur in the synchronous rotations of the two spindle drive motors due to modulation of the control system of the two spindle drive motors or the like, the rotations of the two spindle drive motors can be immediately stopped. .

According to the invention described in claim 9, since the detection shaft extends in the same direction as the main shaft and the like, the structure can be downsized. According to the tenth aspect of the invention, when an abnormality occurs in the synchronous rotation of the pair of main shafts, the clutch slips, and the connection of the divided portions of the detection shaft is released.

[0039]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below in detail with reference to FIGS. 1 to 5 and 7 to 10.

As shown in FIG. 1, a pair of headstocks 21 and 21.
Numerals 2 are arranged so as to face each other on a table (not shown) at a predetermined interval. The hollow main shafts 23, 24 are rotatably supported by the respective headstocks 21, 22 via bearings 25 so as to be located on the first axis α.

The chuck bodies 26 and 27 are attached to a mounting member 28,
The main shafts 23 and 24 are attached via the ends 29, and gripping parts 32 and 33 as chuck parts, which are composed of a holder 30 and a clamp arm 31, are provided at the opposing ends thereof. Then, the grips 32 and 33 allow the both-end journals 35 and 3 of the crankshaft 34 to be
6 is gripped on a second axis β parallel to the first axis α. The distance ε between the second axis β and the first axis α is between the centers of the journals 35 and 36 of the crankshaft 34 and the centers of the pins 40 to 42 as shown in FIG. Distance (one half stroke)
It is set according to κ.

In addition, the chuck bodies 26 and 27 extend and contract the distance ε between the second axis β and the first axis α with respect to the mounting members 28 and 29, that is, the first axis α. It is mounted so that it can be moved and adjusted in a direction orthogonal to. Then, by rotating the adjusting screw 39 with a nut runner or the like (not shown), the chuck bodies 26, 27
Is moved to adjust the distance ε between the two axes α and β.

Further, in a state where the crankshaft 34 is held between the chuck bodies 26 and 27, any one of the crankpins 40 to 42, for example, the crankpins 40 on both sides is aligned with the first axis α of the main shafts 23 and 24. They are arranged on the same axis.

A pair of main shaft drive motors 51, 52 consisting of servo motors are installed corresponding to the respective main shafts 23, 24, and these motor shafts are attached to the main shafts 23, 24 via a pair of gears 53, 54, respectively. Operatively connected. Then, due to the synchronous rotation of the main shaft drive motors 51 and 52, both main shafts 23 and 24 are synchronously rotated at the same speed and in the same direction, and the crankshaft 34 held between the grip portions 32 and 33 is rotated to the main shafts 23 and 24. Is rotated about any one of the crankpins 40 to 42 located on the same axis as the first axis α of. Therefore, both end journals 35 and 36 of the crankshaft 34 are revolved around the crankpins 40 to 42 together with the chuck bodies 26 and 27. In this revolving state, the grinding wheel 20 is rotationally driven and comes into contact with any of the crank pins 40 to 42 on the first axis α, and the outer peripheral surfaces of the crank pins 40 to 42 are processed for machining or polishing. To be done.

As shown in FIGS. 1 and 3, the phase conversion shaft 55
Is rotatably supported by one chuck body 26 so as to be located on the same axis as the second axis β. The indexing plate 56 is fixed to the phase conversion shaft 55, and a pin 58 engageable with an eccentric hole 57 on one end face of the crankshaft 34 is projected on the end face thereof, and a plurality of positioning parts are formed on the outer periphery. Engagement grooves 59 are formed at the same predetermined phase as the arrangement phase of the crank pins 40 to 42.

The cylinder 60 is arranged on one chuck body 26 so as to face the peripheral surface of the indexing plate 56, and the piston rod thereof has an engaging groove 59 of the indexing plate 56.
An engaging body 61 as a holding member that can be engaged and disengaged is attached to the. The engaging body 61 engages with one engaging groove 59 on the indexing plate 56, whereby the indexing plate 56
And the phase conversion shaft 55 is held at the selected indexing angle so that any one of the crankpins 40 to 42 can rotate.
Positioned and held in a state of being arranged on the first axis α of 3, 24.

The pusher 62 is disposed in the index plate 23 and the phase conversion shaft 55, and is pushed outward by the urging force of the spring 63 so as to contact and support one end surface of the crankshaft 34. ing. The cylinder 64 is arranged in the chuck body 27 on the side opposite to the pusher 62, and the piston rod of the cylinder 64 allows the crankshaft 3 to move.
The other end surface of 4 is pressed to connect the crankshaft 34 to the pin 58 of the index plate 56.

The phase indexing shaft 65 is supported at the center of the one main shaft 23 so as to be relatively rotatable through a bearing (not shown). The Schmidt coupling 66 as an expansion joint is interposed between the phase indexing shaft 65 and the phase converting shaft 55, and the shafts 23 and 65 are connected to each other via the Schmidt coupling 66 and the pair of gears 69 and 70. It is operatively connected with a rotation transmission ratio of 1: 1. The phase indexing motor 67 is mounted on one of the headstocks 21, and its motor shaft is directly connected to the phase indexing shaft 65 via a coupling 68.

As shown in FIGS. 1, 4 and 5, the Schmidt coupling 66 includes a drive coupling plate 71, an intermediate coupling plate 72, and a driven coupling plate 73. The drive coupling plate 71 is mounted so that its center η is located so as to be offset by a predetermined distance κ in a direction orthogonal to a perpendicular line γ connecting the first axis α and the second axis β. It is rotatably supported by 26.

The driven coupling plate 73 is also used.
Are concentrically fixed to the phase conversion shaft 55. The intermediate coupling plate 72 has three links 74 on one side.
Is connected to the drive coupling plate 71 via the link, and is connected to the driven coupling plate 73 via the three links 75 on the other side. The center ω of the driven coupling plate 73 is located on the second axis β.

The predetermined distance κ corresponds to at least the unstable region of the Schmidt cup link 66, that is, the minimum prescribed value δ of the approach distance between the center η of the drive coupling plate 71 and the center ω of the driven cup link plate 73. It is set larger than the size. Then, when the half stroke of the crankshaft 34 to be processed changes due to the change of the work to be processed, the second axis β of the phase conversion shaft 55 with respect to the first axis α of the phase indexing shaft 65. The chuck bodies 26 and 27 are moved in the radial direction toward and away from each other to adjust the distance between the first axis α and the second axis β. At this time, as shown in FIGS. 4 (a) (b) (c),
The corresponding positional relationship between the plates 71, 72, 73 changes. In addition, in FIG. 5, it is schematically drawn for easy understanding.

The controller 76, which constitutes the control means, includes the phase indexing motor 67 and the both spindle drive motors 51, 52.
There are two modes for controlling the operation of the. That is, during the machining operation, the first mode for machining is executed by the action of the controller 76, and the phase indexing motor 67
And both spindle drive motors 51 and 52 are synchronously controlled at the same speed, and the phase conversion shaft 55 is integrally rotated with the spindles 23 and 24 in the same direction via the phase indexing shaft 65 and the Schmidt coupling 66. It has become so. Further, when the pins 40 to 42 of the crankshaft 34 are phase-indexed, the control device 76 acts to perform the second phase indexing.
The mode is executed. Then, the both spindle drive motors 51,
In the stopped state or the rotated state of 52, the phase indexing motor 67 is synchronously controlled with a relative speed difference with respect to the both spindle drive motors 51 and 52. This allows
The phase conversion shaft 55 is relatively rotated with respect to the main shafts 23 and 24 for phase indexing via the phase indexing shaft 65 and the Schmidt coupling 66.

As shown in FIGS. 1 and 7, the detection shaft 81 is rotatably supported between the two headstocks 21 and 22, and both ends of the detection shaft 81 are connected via gears 82 and 83 to the main shaft drive motor 5.
1, 52 motor shafts are operatively connected. The detection shaft 81 is arranged at a position different from the first axis α and the second axis β and on an axis parallel to the axes α and β. The detection shaft 81 is divided into two parts 86 and 87 in the vicinity of one headstock 21, and a clutch 88 is interposed in the divided part.

As shown in FIGS. 7 and 8, the clutch 88 is provided with a pair of clutch plates 95 and 96 arranged so as to face the divided portion of the detection shaft 81. The first clutch plate 95 is fitted and supported by a clutch plate support 97 fixed to one portion 86 of the detection shaft 81 so as to be movable in the axial direction. On the other hand, the second clutch plate 96 is fitted and fixed to the other portion 87 of the detection shaft 81.

Further, a plurality of accommodating holes 90 for accommodating and retaining the balls 89 are formed in the first clutch plate 95.
The clutch plate 96 is formed with a plurality of engagement recesses 98 with which the balls 89 are slidably engaged. Further, a detection flange 91 is integrally formed on the outer peripheral edge of the first clutch plate 95 so as to project.

A plurality of coil springs 99 are interposed between the ring member 92 fixed to the clutch plate support 97 and the first clutch plate 95, and the first clutch plate 95 faces the second clutch plate 96 side. I am urged to move. Then, normally, as shown in FIG. 9, the ball 89 in the accommodation hole 90 of the first clutch plate 95 is urged by the urging force of the coil spring 99.
, Is engaged with the recess 98a of the second clutch plate 96, and the two clutch plates 95, 96 are held in the connected state.

The detector 93, which is a detection means composed of a proximity switch, includes the detection flange 9 of the first clutch plate 95.
1 is attached to one headstock 21 via a bracket 94 so as to face 1. Then, normally, in a state where both clutch plates 95 and 96 are connected via the ball 89 by the urging force of the coil spring 99, both side portions 8 of the detection shaft 81 are generated by the synchronous rotation of both the spindle drive motors 51 and 52.
6, 87 are rotated integrally.

On the other hand, when a synchronization deviation exceeding a predetermined amount occurs between the motor shafts of the both spindle drive motors 51, 52, a twisting force is generated in the divided portion of the detection shaft 81. As a result, as shown by the chain double-dashed line in FIG. 9, each ball 89 disengages from the engagement recess 98 against the biasing force of the coil spring 99 and rides on the end surface of the second clutch plate 96, so that both clutch plates The connection of 95 and 96 is opened and slippage occurs.

In addition, the ball 89 moves from the engaging recess 98 to the second position.
When riding on the end surface of the clutch plate 96, the coil spring 99
Contraction causes the first clutch plate 95 to move leftward from the state shown in FIG. 8 to the state shown in FIG. As a result, the detection flange 91 comes close to the detector 93,
A detection signal is output from the detector 93 to the control device 76. Then, the control device 76 stops the rotation of the both spindle drive motors 51 and 52 based on the detection signal from the detector 93.

Next, the operation of the phase indexing device configured as described above will be described. Now, in this phase indexing device, when performing phase indexing of the crank pins 40 to 42, the second mode is executed by the action of the control device 76. During execution of this second mode, both gripping portions 32 and 33 are brought into a semi-clamped state by a moving means (not shown) while both spindle drive motors 51 and 52 are stopped, and the indexing plate 56 is engaged. With the engaging body 61 disengaged from the groove 59, the phase indexing motor 67 rotates the phase indexing shaft 65 by a predetermined angle. That is,
A relative speed difference occurs between the main shafts 23 and 24 and the phase indexing shaft 65.

As a result, the phase indexing shaft 65, the phase converting shaft 55 and the indexing plate 56 are indexed and rotated with respect to the chuck bodies 26 and 27. The crankshaft 34 is index-rotated about the second axis β along with the indexing rotation of the indexing plate 56, and any one of the crankpins 40 to 42 having different phases on the crankshaft 34 is rotated by the main shaft. The first and second axes 23 and 24 are indexed and arranged at a processing position on the same axis.

When the indexing is completed, the engaging body 61 of the cylinder 60 is engaged with the engaging groove 59 of the indexing plate 56, and the indexing plate 56 is held at the predetermined indexing angle. Next, the crankshaft 34 is set at a required indexing position with its both-end journals 35 and 36 clamped by the grips 32 and 33.

On the other hand, during the machining operation, the controller 76 executes the first mode. During execution of this first mode, the phase indexing motor 67 drives the both spindle drive motors 5
1, 52 are controlled synchronously in the same direction at the same speed, and the phase conversion shaft 55 is connected to the main shafts 23, 24 and the chuck body 2 via the phase indexing shaft 65 and the Schmidt coupling 66.
6 and 27 are rotated integrally. As a result, the crankshaft 34 has the first axis α concentric with the main shafts 23, 24.
The crank pin 4 is rotated around any one of the crank pins 40 to 42 that are indexed and positioned above.
The peripheral surface of 0 to 42 is processed by the grinding wheel 20.

During the machining of the crank pins 40 to 42, the clutch 88 on the detection shaft 81 is usually in the state of being connected via the ball 89 by the urging force of the coil spring 58. Therefore, the two spindle drive motors 51, 52
The main shafts 23 and 24 are synchronously rotated by the synchronous rotation of
When the normal machining operation is performed, both side portions 86 and 87 of the detection shaft 81 are integrally rotated via the clutch 88.

Further, during this machining operation, if a synchronous deviation occurs in the synchronous rotation of the motor shafts due to modulation of one control system of the main shaft drive motors 51, 52, etc., a twisting force acts on the clutch 88 of the detection shaft 81. . Then, when the synchronization deviation between the motor shafts exceeds a predetermined amount, the clutch 8 of the detection shaft 81
When a twisting force of a predetermined value or more acts on 8, a speed difference is generated between both side portions 51a and 51b of the detection shaft 81, and a relative slip occurs between both clutch plates 95 and 96.

The slip of the clutch plates 95 and 96 causes the ball 89 to ride up from the recess 98 of the second clutch plate 96, whereby the first clutch plate 95 is moved to the position shown in FIG.
After being moved to the left from the state, the detection flange 91 approaches the detector 93, as shown in FIG. Therefore, the abnormal state of the synchronization deviation of the motor shafts is detected by the detector 93, and the rotation of the spindle drive motors 51 and 52 is immediately stopped by the control of the control device 76. Therefore, the spindle 2
The crankshaft 34 continues to be rotated and the machining operation is not continued in the state where the synchronous rotation deviation is still generated in 3 and 24.

Further, when the crankshaft 34 is changed to one having a different half stroke, the chuck main bodies 26 and 27 are moved and adjusted via an adjusting screw by a nut runner or the like (not shown) to adjust the axis α. , Β distance ε
Change the setting. Then, with this change, the Schmidt coupling 66 expands and contracts. That is, FIG.
As shown in (a), (b), and (c), the driven coupling plate 7 corresponds to the change in the distance ε between the axes α and β.
The center β of 3 is moved in the expansion / contraction direction of the distance ε on the vertical line γ. Therefore, it is possible to sufficiently follow the crankshaft 34 having a relatively large stroke of a half stroke and the crankshaft 34 having a relatively small stroke of a half stroke, and to cope with a wide range of stroke changes. .

That is, in this embodiment, as shown in FIG.
As shown in FIG. 5, the drive coupling plate 71 is moved to one side in a direction in which the center η thereof is orthogonal to the perpendicular line γ of the expansion / contraction direction of the Schmidt coupling 66, at least the minimum specified value which is an unstable region of the Schmidt coupling 66. The stroke portion of δ is displaced from the beginning by a predetermined distance κ and arranged at a position offset. The phase indexing shaft 65 and the drive coupling plate 71 are directly connected to each other by gears 33 and 34.

By doing so, when the second axis β is brought closer to the first axis α, the center η of the driven coupling plate 73 moves on the vertical line γ. Therefore, as shown by the chain double-dashed line in FIG. 5, the driven coupling plate 73 passes laterally of the drive coupling plate 71, and can be further moved in the same direction after the passage. At this time, since the driven coupling plate 73 does not approach the drive coupling plate 71 beyond the distance between the centers thereof, the Schmidt coupling 27 can be expanded and contracted without difficulty. Therefore, even if the half stroke of the crankshaft 34 is small, regardless of the minimum specified value δ of the Schmidt coupling 66, the Schmidt coupling 66
The expansion and contraction movement of is allowed.

Further, in this embodiment, as shown in FIG. 5, the center η of the drive coupling plate 71 is offset from the vertical line γ by a predetermined distance κ in a direction orthogonal to the vertical line γ, and the phase indexing shaft 65 is further provided. Perpendicular to the position
It is arranged at a position offset by a predetermined distance λ in the direction. As a result, in comparison with the conventional configuration shown in FIG.
There is no restriction on the contraction direction of the Schmidt coupling 66, and it is possible to further lengthen the Schmid coupling 66 in the expansion direction by the offset of the distance λ. Therefore, one-half stroke of the crankshaft, from a large stroke εmax that could not be conventionally supported to a small stroke ε equal to or less than the minimum specified value δ, can be applied to various crankshafts 34 with the same device. become.

The effects exhibited by the above embodiment will be described below. (1) In this phase indexing device, the relative rotation of the phase indexing motor 67 and the both spindle drive motors 51 and 52 during machining operation and phase indexing is performed under the synchronous rotation control. , 24 and the phase indexing shaft 65 do not need to interpose a complicated planetary gear mechanism. Therefore, the structure of the device is simple, the overall size can be reduced, and the manufacturing cost can be reduced. Further, since the planetary gear mechanism is not necessary, not only noise due to rattling noise of gears can be eliminated, but also replacement due to gear wear and maintenance such as refueling become unnecessary.

(2) Since the phase conversion shaft 55 is provided with the indexing plate 56, the positioning and position holding of the phase conversion shaft 55 at a predetermined indexing angle is directly performed by mechanical engagement, and the indexing plate 56 is indexed. It is possible to improve the delivery and position holding accuracy.

(3) Phase indexing shaft 65 and phase conversion shaft 5
Schmidt coupling 66 is the coupling between 5 and
Therefore, it is possible to secure a large amount of expansion and contraction between the shafts 65 and 55, and it is possible to easily cope with a large change in half stroke of the crankshaft 34.

(4) Particularly, in the Schmidt coupling 66 of this embodiment, as shown in FIGS.
As shown in (c), the center ω of the driven coupling plate 73 is moved along the perpendicular γ in the expansion / contraction direction of the distance ε in response to the change of the distance ε between the axes α and β. There is. Therefore, as described above, even for a relatively large crankshaft 34 having a half stroke (see FIG.
(In the case of (a)) Half stroke is relatively small,
For example, even in the case where the Schmidt coupling 66 slightly exceeds the minimum specified value δ (in the case of FIG. 4C), it is possible to sufficiently follow and easily cope with a wide stroke change.

(5) Since the phase indexing shaft 65 is inserted into the hollow main shaft 23, the shaft configuration can be downsized, and the entire device can be downsized. (6) A detector 93 is provided as a detection means for detecting a rotational synchronization deviation between the motor shafts of the both main shaft drive motors 51, 52. Therefore, when an abnormality occurs in the synchronous rotation between the two motor shafts, it is possible to detect it and immediately stop the rotation of the both spindle drive motors 51 and 52. Therefore, no twist is applied to the crankshaft 34 held between the chuck bodies 26, 27 at the tips of the both spindles 23, 24, and the machining operation is continued with the twisting force acting on the crankshaft 34. It is possible to prevent the machining accuracy of the work from being deteriorated.

(7) Since the detection shaft 81 extends in the same direction as the main shafts 23, 24, etc., the overall structure can be miniaturized. (8) When a synchronism shift occurs between the two main shafts 23, 24, the clutch 88 is caused to slip to allow the main shafts 23, 24 to slip.
Is stopped. Therefore, the detection shaft 81 is not provided with a power transmission function, a thin and lightweight detection shaft 81 can be adopted, the detection shaft 81 can be rotated with a small torque, and energy loss can be suppressed.

(9) Moreover, when the main shafts 23 and 24 are out of synchronization, the clutch 88 slips, so that the detection shaft 8
Even if an excessive torque difference occurs between both side portions 86 and 87 of 1, the damage of the detection shaft 81 can be prevented.

The present invention may be modified and embodied as follows. (1) A pair of phase indexing mechanisms, such as the phase indexing shaft 65 and the phase indexing motor 67, should be provided for the respective main shafts 23 and 24. With this configuration, it is suitable for phase indexing of a crankshaft having a large total length.

(2) The drive coupling plate 71 and the phase indexing shaft 65 should be connected using a toothed belt instead of a gear connection. According to this structure, the displacement distance κ can be increased, and the flexibility of design is improved.

(3) As shown in FIG. 6, in place of the configuration of FIG. 5, the configuration is such that a predetermined distance λ offset in the direction of the normal γ is omitted. (4) Both spindle drive motors 51, 52 should be built-in motors.

(5) In this case, both detection shafts 81 are provided between the two main shafts 23 and 24, for example, between shafts of timing pulleys connected to each other by a belt. (6) The indexing plate 56 serves as a positioning portion and a holding member.
And using a toothed coupling between the chuck bodies 26, 27.

Even with such a configuration, the effects of the above-described embodiment can be enjoyed. (7) Under the first mode, the phase indexing motor 67
Is not driven, the engaging groove 59 of the index plate 56 and the engaging body 61 of the chuck bodies 26, 27 are brought into a coupled state, and the phase conversion shaft 55 is integrated with the chuck bodies 26, 27 as the main shafts 23, 24 rotate. To rotate.

(8) In the second mode, when the spindle drive motors 51 and 52 rotate, the phase indexing motor 67 is synchronously rotated at a rotation speed different from that, whereby the phase indexing shaft 65 is moved to the spindle 23, It should be configured to perform phase indexing by rotating with a relative speed difference with respect to 24. In this case, the control device 76 may be configured to change only the rotation speeds of the spindle drive motors 51 and 52, or the rotation speed of only the phase indexing motor 67, or Drive motors 51, 52
The object can be achieved by changing the rotation speeds of both the phase indexing motor 67 and the phase indexing motor 67. Then, in this way, the motors 51, 52, 67 are continuously processed.
It is possible to perform phase indexing without stopping.
Therefore, the efficiency of processing can be improved.

[0084]

Since the present invention is constructed as described above, it has the following effects. Claims 1, 11, 1
According to the inventions described in Nos. 2, 14 and 15, a complicated planetary gear mechanism is not required, the structure of the device is simple and the entire size can be reduced, and the manufacturing cost can be reduced, and the noise can be reduced. It can be suppressed and maintenance becomes easy.
Moreover, phase indexing can be performed even while the spindle is rotating, and the processing efficiency is improved.

According to the second aspect of the present invention, the phase indexing shaft is located in the main shaft, so that the size can be reduced. According to the invention described in claims 3, 4 and 13, the phase conversion shaft can be directly positioned by mechanical engagement, whereby the crank pin is accurately positioned at a required indexing position. Can contribute to high precision machining.

According to the invention described in claim 5, it is possible to cope with the change of the 1/2 stroke S1 of the crankshaft,
Various types of crankshafts can be processed. Claim 6
According to the invention described in (1), the half stroke S1 of the crankshaft is relatively large to small,
Not only can it be easily dealt with, but it can also contribute to the miniaturization of the device.

According to the invention described in claim 7, the distance of the chuck center of the chuck body with respect to the axis of the main shaft can be adjusted, and the 1/2 stroke of the crankshaft can be easily changed.

According to the eighth aspect of the present invention, when an abnormality occurs in the synchronous rotation of the two spindle drive motors due to the modulation of the control system of the two spindle drive motors, etc., the rotation of the two spindle drive motors is immediately stopped. be able to.

According to the invention described in claim 9, since the detection shaft extends in the same direction as the main shaft and the like, the structure can be downsized. According to the tenth aspect of the invention, when an abnormality occurs in the synchronous rotation of the pair of main shafts, the clutch slips, and the connection of the divided portions of the detection shaft is released. Therefore, damage to the detection shaft can be prevented.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a crankpin grinder embodying the present invention.

FIG. 2 is an explanatory diagram for explaining phase indexing of a crank pin.

FIG. 3 is a partially enlarged sectional view showing a positioning structure of a phase indexing shaft.

FIG. 4 is an explanatory diagram for explaining the operation of the Schmidt coupling.

FIG. 5 is an explanatory view for explaining the operation of the Schmidt coupling.

FIG. 6 is an explanatory view showing another embodiment of the Schmidt coupling.

FIG. 7 is an enlarged front view showing a detection mechanism.

FIG. 8 is a partially enlarged vertical sectional view showing the clutch mechanism of FIG.

9 is a partially enlarged cross-sectional view showing the clutch mechanism of FIG.

FIG. 10 is an enlarged cross-sectional view showing a part of FIG.

FIG. 11 is a perspective view showing a conventional Schmidt coupling.

FIG. 12 is an explanatory diagram for explaining the operation of the conventional Schmidt coupling.

[Explanation of symbols]

21, 22 ... Headstock, 23, 24 ... Spindles, 26, 27 ...
Chuck body, 32, 33 ... Gripping portion as chuck portion, 34 ... Crank shaft, 35, 36 ... Journal, 40, 41, 42 ... Crank pin, 51, 52 ... Spindle drive motor, 55 ... Phase conversion shaft, 56 ... Index plate, 5
9 ... Engaging groove as positioning portion, 61 ... Engaging body as holding member, 65 ... Phase indexing shaft, 66 ... Schmidt coupling, 67 ... Phase indexing motor, 71 ... Drive coupling plate, 72 ... Intermediate cup Ring plate, 7
3 ... Driven coupling plate, 76 ... Control device as control means, 81 ... Detection shaft, 86, 87 ... Part, 88 ...
Clutch, 89 ... Ball, 93 ... Detector as detecting means, α ... First axis, β ... Second axis.

Front Page Continuation (72) Inventor Yukio Ojiji 100 Fukuno-cho, Higashitonami-gun, Toyama Prefecture Hihira Toyama Co., Ltd. Toyama Plant

Claims (15)

[Claims] 1. A first axis line is arranged to face each other at a distance,
A pair of spindles that are respectively rotated by a pair of spindle drive motors that are controlled in synchronization with each other, a chuck body that is provided at the tip of each spindle, and a chuck body that is provided on each chuck body and that is separated from the first axis line. A chuck portion for gripping both end journals of the crankshaft on a second axis parallel to the first axis, and a chuck portion rotatably provided on the second axis of at least one chuck body and engaged with an end surface of the crankshaft. Then, the crankshaft is rotated to phase-crank the crankpins having different phase angles on the first axis, and the phase conversion shaft is connected to the phase conversion shaft and concentric with the main shaft.
A phase indexing shaft rotated by a phase indexing motor, wherein the phase conversion shaft is synchronously rotated at the same speed as the pair of main shafts, and the phase conversion shaft is relative to the pair of main shafts. A crank pin phase indexing device provided with control means for controlling the phase indexing motor and both spindle drive motors so that the second mode in which the two are synchronously rotated with a speed difference is executed. 2. At least one main shaft has a hollow shape,
The crank pin phase indexing device according to claim 1, wherein the phase indexing shaft is arranged in the main shaft thereof. 3. The phase conversion shaft is provided with a plurality of positioning portions corresponding to indexing angles, and the chuck body is removably engaged with the positioning portion of the phase conversion shaft to index the phase conversion shaft to a predetermined index. The crank pin phase indexing device according to claim 1, further comprising a holding member that holds the position at an angle. 4. The crankpin phase according to claim 3, wherein in the first mode, when the phase indexing motor is stopped, the phase conversion shaft is rotated integrally with the chuck body together with the rotation of the main shaft via the holding member. Indexing device. 5. A phase conversion axis and a phase indexing axis are provided between the phase conversion axis and the phase indexing axis.
The crank pin phase indexing device according to any one of claims 1 to 4, wherein an expansion joint capable of changing the distance between the shafts is interposed. 6. The expansion joint includes a drive-side coupling plate, a driven-side coupling plate, an intermediate coupling plate located therebetween, and a Schmidt cup including a link interposed between the coupling plates. The drive coupling plate and the phase indexing shaft are gear-coupled with each other, and the center position of the drive coupling plate is displaced from the center of the phase indexing shaft by a predetermined amount in the direction orthogonal to the coupling expansion / contraction direction. The crank pin phase indexing device according to claim 5, wherein the crank pin phase indexing device is arranged in a row. 7. The crank pin phase divider according to claim 5, wherein the chuck body is provided so as to be positionally adjustable with respect to the spindle in a direction in which the distance between the first axis and the second axis expands and contracts. Output device. 8. A detection shaft is connected between the motor shafts of both spindle drive motors, and when a rotation synchronization shift occurs between the motor shafts of the detection shaft, the detection shaft is detected to drive both spindles. 8. A detecting means for stopping the motor is provided.
The crank pin phase indexing device according to any one of 1. 9. The crank pin phase indexing device according to claim 8, wherein the detection shaft is arranged on another axis parallel to the axis of the main shaft and the axis of the chuck body. 10. The detection shaft is divided into two parts, and a clutch is provided between the divided parts. The clutch generates a slip when the main shafts are out of synchronization with each other. The crank pin phase indexing device according to claim 8 or 9, wherein slipping of the clutch is detected to stop the motor. 11. A pair of main shafts, which are arranged to face each other on a first axis and are rotated by a pair of main shaft drive motors that are controlled in synchronization with each other, and a chuck body provided at the tip of each main shaft. A chuck portion provided on each chuck body for gripping both end journals of the crankshaft on a second axis that is separated from the first axis and is parallel to the first axis; 2 is provided rotatably on the axis line, is engaged with an end surface of the crankshaft to rotate the crankshaft, and is for phase-indexing the crankpins having different phase angles on the first axis line according to machining. A phase conversion shaft, and is arranged concentrically with the main shaft by being connected to the phase conversion shaft,
In a crankpin phase indexing device provided with a phase indexing shaft rotated by a phase indexing motor, the operation of the phase indexing motor and both spindle drive motors is controlled by a control means, and the first mode of the machining mode is used during machining operation. By executing, the phase conversion shaft is synchronously rotated at the same speed as the pair of main shafts, and by executing the second mode during phase indexing,
A crankpin phase indexing method that rotates the phase conversion shaft synchronously with a relative speed difference with respect to a pair of main shafts. 12. The phase indexing motor and the both spindle drive motors are synchronously driven in the first mode.
The crankpin phase indexing method described in 1. 13. The phase conversion shaft is held in position relative to the chuck body at a predetermined indexing angle by a holding member, and in the first mode, the phase conversion shaft is held together with rotation of the main shaft while the phase indexing motor is stopped. The crankpin phase indexing method according to claim 11, wherein the crankpin phase indexing method is to rotate integrally with the chuck body via a member. 14. The phase indexing motor is rotated in the second mode while both spindle drive motors are stopped.
The crankpin phase indexing method according to any one of 1 to 13. 15. In the second mode, the rotational speeds of at least one of the both spindle drive motors and the phase indexing motor are changed while the both spindle drive motors are rotating, thereby providing a relative speed difference between them. 13. The crankpin phase indexing method according to any one of 13 above.