JPH07178665A - Grinding machine - Google Patents

Abstract

PURPOSE:To safely and quickly perform work for replacing an exchange unit while eliminating necessity for adjusting an individual space of each workpiece rest necessary for a very long time. CONSTITUTION:A plurality of workpiece rests 6, presetting a space in the axial direction of a workpiece so as to correspond to a kind of a workpiece (cam shaft W), are integrally formed with a tailstock 5 to form an exchange unit 19, and the prescribed exchange unit is slide transferred replaceably with a work table 3 by a transfer unit 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grinder used for grinding a crankshaft, a camshaft and the like.

[0002]

2. Description of the Related Art Conventionally, as this type of grinding machine, one shown in FIG. 5 has been known. This grinding machine is provided with a work table b slidably mounted on a bed a.
On the work table b, a cam shaft w of a four-cylinder engine as a work is arranged with its axis oriented in the sliding direction of the work table b. Further, on the work table b, a work head c that supports one end of the cam shaft w to impart rotation to the cam shaft w, a tail stock d and a cam that rotatably support the other end of the cam shaft w. Four work rests f that support the journal portion e of the shaft w at an interval in the axial direction are arranged. The work head c, tail stock d, and each work rest f are slidable in the left-right direction with respect to the work table b.

A rotary grindstone g is provided on one side of the camshaft w so as to be movable in a direction orthogonal to the axis of the camshaft w.
The cam shaft w is ground by being moved closer to.

In such a grinding machine, when the work is changed from the camshaft w of the 4-cylinder engine to the camshaft of the 3-cylinder engine, the intervals of the journal portions e of the camshaft are different between the 4-cylinder and the 3-cylinder. Therefore, it becomes necessary to adjust the individual intervals of each work rest f. To perform the adjustment, each workrest f is individually slid to adjust the interval, and when the adjustment is completed, each workrest f is clamped.

By the way, since the intervals between the respective journal portions of the camshaft are designed with high accuracy, the intervals between the respective work rests that support the journal portions also necessarily require high accuracy. However, in such a conventional grinder, when adjusting the individual intervals of the respective work rests f, as described above, the respective work rests f are individually slid and adjusted, so that each work piece can be adjusted with high accuracy. It takes a long time to set the individual intervals of the rests, and the adjustment needs to be performed every time the work is changed, so that it takes a lot of time and labor especially when grinding many kinds of works. There was a problem.

When the number of journal portions e differs depending on the type of camshaft, the journal portion e
It is necessary to install the work rests f on the work table b according to the number of the work rests. However, in the conventional grinder, the work rests f are attached to and removed from the work table b using a simple crane or the like. Therefore, there is a disadvantage that the work is dangerous and the work is complicated and takes a long time.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in order to eliminate such inconvenience, and even if the work is changed, the intervals of the respective work rests corresponding to the work can be set only by replacing the replacement unit. By doing so, it eliminates the need to adjust the individual spacing of each workrest, and
It is an object of the present invention to provide a grinder capable of safely and quickly attaching and removing the replacement unit.

[0008]

In order to achieve the above object, a first aspect of the present invention provides a work head for supporting one end of a shaft-like work and imparting rotation to the work, and the work. And a tail stock that rotatably supports the other end of the work, and a work rest that supports a plurality of predetermined positions in the axial direction according to the type of the work and that is arranged in the middle part of the work with a plurality of axial intervals. A work table that slidably supports the tail stock and the plurality of work rests along the axial direction of the work; and a work table that is movably provided in a direction orthogonal to the axis of the work and approaches the work. In a grinder provided with a rotary grindstone for grinding the work by moving, the plurality of work rests are provided with an axial interval of the work so as to correspond to the kind of the work. And an exchange unit integrally formed with the tailstock, and on the extension line of the movement direction of the exchange unit to the other end side of the work, there are various types of exchange units according to the type of the work. Is provided, and a transfer unit that slideably transfers a predetermined replacement unit onto the work table is provided.

A second aspect of the present invention is a work head for supporting one end of a shaft-like work to impart rotation to the work, and a tail stock for rotatably supporting the other end of the work. And a work rest that is arranged in the intermediate portion of the work at intervals in the axial direction and supports a plurality of predetermined axial positions according to the type of the work, and the tail stock and the plurality of work rests. A work table that slidably supports along the axial direction of the work, a table support base that slidably supports the work table along the axial direction of the work, and the work table along the axial direction of the work. By means of table feed means for slidingly moving along with, and movably provided in the direction orthogonal to the axis of the work, and moving closer to the work. In a grinder provided with a rotary grindstone for grinding a work, the plurality of work rests are set with an axial interval of the work so as to correspond to the type of the work, and are integrally formed with the tail stock. And a predetermined replacement unit is slidably transferred to the work table by being arranged on the extension line of the work table on the extension line of the movement direction to the other end side of the work. A plurality of transfer tables on which different types of exchange units are arranged are arranged in a direction orthogonal to the axis of the work and are movable in the same direction. Shift means for moving the mounting table in a direction orthogonal to the axis of the work to arrange a predetermined transfer table on the extension line is provided, and the transfer table is provided with the shift table on the work table. A first locking mechanism that locks an end of the replacement unit detachably is provided, and the work table holds the replacement unit when the replacement unit is locked by the first locking mechanism. A second locking mechanism that locks the work table releasably and a third locking mechanism that locks the replacement unit to the work table at the set position of the work are provided. It is what

[0010]

According to the first aspect of the present invention, a plurality of work rests, in which the axial intervals of the works are preset so as to correspond to the types of works, are integrally formed with the tailstock to form an exchange unit. Since the predetermined replacement unit is slidably transferred to the work table by the transfer means, the individual intervals of the respective work rests are set according to the change of the work only by exchanging the replacement unit. Since the replacement unit is replaced by slide transfer between the transfer means and the work table, it is not necessary to use a crane or the like when replacing the replacement unit.

According to the second aspect of the present invention, the replacement unit is replaced as follows.

First, the work table is slid toward the transfer table by the table feeding means. Next, the locking of the replacement unit with respect to the work table by the third locking mechanism is released, and the replacement unit on the work table is locked by the first locking mechanism. In this state,
The work table is slid by the table feed means in a direction away from the transfer table. At this time, since the replacement unit is locked by the first locking mechanism, the replacement unit moves in the direction in which the work table is separated from the transfer table while being left in the locking position.

Next, the replacement unit is locked to the work table by the second locking mechanism, and the locking of the replacement unit by the first locking mechanism is released. In this state, when the work table is slid by the table feeding means toward the transfer table, the replacement unit is locked to the work table by the second locking mechanism, so that the work table and the replacement unit are integrated. The transfer unit is slid to the transfer table. After being transferred, the replacement unit is unlocked by the second locking mechanism, and the work table is returned to the original position by the table feeding means.

Next, each transfer table is shifted in the direction orthogonal to the axis of the work by the shift means, and the other exchange unit is positioned on the extension line of the work table in the sliding direction. After that, the work table is slid toward the transfer table by the feeding means, and the replacement unit is locked to the work table by the second locking mechanism. In this state, the work table is slid by the feeding means in the direction away from the transfer table. At this time, since the replacement unit is locked to the work table by the second locking mechanism, the replacement unit moves together with the work table in the same direction.

Next, the locking of the replacement unit by the second locking mechanism is released, and the replacement unit is locked by the first locking mechanism. In this state, the work table is slid toward the transfer table by the table feeding means. At this time, since the replacement unit is locked by the first locking mechanism, the work table slides toward the transfer table with the replacement unit left in the locking position, and thereby the work table is moved to the work table. The replacement unit is slide-transferred. Then, the replacement unit transferred to the work table is locked at the work setting position by the third locking mechanism, thereby completing the replacement of the replacement unit.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 is a plan view of a grinder which is an example of the embodiment of the present invention, FIG. 2 is a front view of FIG. 1, and FIG. 3 is III- of FIG.
FIG. 4 is a sectional view taken along line III, and FIG. 4 is an explanatory diagram for explaining a method of replacing the replacement unit.

The overall structure will be described with reference to FIGS. 1 to 3. The grinder 1 includes a work table 3 which is slidable on the bed 2 in the left-right direction. A camshaft W of a four-cylinder engine as a work is arranged above the work table 3 with its axis oriented in the sliding direction of the work table 3. The work table 3 is provided with a work head 4 that supports the left end of the cam shaft W and applies rotation to the cam shaft W.
To the right of the work head 4, four work rests 6 that support the journal portion J of the cam shaft W at an axial interval and a tail stock that rotatably presses and supports the right end portion of the cam shaft W. An exchange unit 19 integrally formed with 5 is provided on the work table 3 so as to be slidable in the left-right direction. On one side of the camshaft W, a grindstone base 7 having a rotating grindstone 7a for grinding the camshaft W by moving closer is provided so as to be movable in a direction orthogonal to the axis of the camshaft W. . A transfer unit 8 for slidably transferring a predetermined replacement unit 19 onto the work table 3 is arranged at the right end of the bed 2. The bed 2 is extended on the pedestal 9 in the left-right direction. A guide portion 10 for guiding the sliding movement of the work table 3 is formed on the upper surface thereof.

The work table 3 has a rectangular shape elongated in the left-right direction, and a ball screw feed mechanism 11 having a drive motor 11a is connected to the left end portion thereof. By driving the drive motor 11a, the work table 3 slides in the left-right direction along the guide portion 10. In addition, a guide portion 12 is formed on the upper surface of the work table 3 for guiding the work head 4 and the replacement unit 19 to slide in the left-right direction. Guide part 12
As shown in FIG. 3, the cross section has an inverted trapezoidal cross section, and the upper surface 13 and the slope portions 14 and 15 on both the left and right sides serve as guide surfaces for the work head 4 and the replacement units 19.

The work head 4 has a lower portion as a slide portion 18 having a slide surface having a shape corresponding to the guide surface of the work table 3, while an upper portion is provided with a center 17 which is rotationally driven by a drive motor 16. ing. The center 17 supports the left end of the camshaft W to impart rotation to the camshaft W.

The lower part of the exchange unit 19 is a slide portion 21 having a slide surface 20 having a shape corresponding to the guide surface of the work table 3 (see FIG. 3). At the center of the tailstock 5, there is provided a center 5a that rotatably presses and supports the right end of the camshaft W. The respective work rests 6 are fixedly arranged with individual intervals set in accordance with the type of work, here the intervals of the journal portions J of the camshaft W of the 4-cylinder engine. Work rest 6
As shown in FIG. 3, sliding bodies 22 and 23 slidable in a direction orthogonal to the axis of the camshaft W are vertically spaced apart from each other.

At the tip of the sliding body 22, a camshaft W
The shoe 22a that is in contact with and supports the journal portion J is attached. On the other hand, a threaded portion 24 is provided at the base end of the sliding body 22 so as to project to the outside.
The sliding body 22 is slid by rotating the screw portion 24 from the outside. In FIG. 3, reference numeral 25 is a fixing screw that fixes the sliding body 22 via a holding plate 26 that engages with an inclined surface 22b formed on the outer peripheral portion of the sliding body 22.

An inclined surface 27 is formed on the upper surface of the tip of the sliding body 23, and the inclined surface 27 is formed above the inclined surface 27.
An engaging member 28 that is wedge-engaged with is provided. A support body 29, which is slidable in the vertical direction, is inserted and disposed above the engagement member 28 via a spring 30. A shoe 29a that is in contact with the lower side of the journal portion J and supports the journal portion J is attached to the tip of the support body 29. on the other hand,
A threaded portion 31 is provided at the base end of the sliding body 23 so as to project to the outside. The sliding body 23 is slid by rotating the screw portion 31 from the outside. Then, when the sliding body 23 slides, the supporting body 29 slides in the vertical direction against the biasing force of the spring 30 by the wedge action of the inclined surface 27 of the sliding body 23 and the engaging member 28. In FIG. 3, reference numeral 23a is a restriction pin that restricts the sliding of the sliding body 23 more than necessary.

Further, as shown in FIG. 2 and FIG. 3, two relief portions 20a are formed at predetermined intervals in the longitudinal direction on the slide surface of the slide portion 21 away from the rotary grindstone 7a. The replacement unit 1 is provided in each escape portion 20a.
Fixing holes 32 and 33 for positioning 9 at the set position of the camshaft W are formed. Each fixing hole 32, 3
3, the fixing holes 32, 3 are provided in the slope portion 14 of the guide portion 12.
The piston parts 36 of the fixed cylinders 34 and 35 (third locking mechanism) provided at the same intervals as 3 are inserted and removed. The exchange unit 19 is positioned by inserting the pistons 36 into the fixing holes 32 and 33. In the positioned state, not only the individual intervals of the respective work rests 6 are set according to the type of work, but also the distance between the work head 4 and the tail stock 5 is set according to the length of the work. Both ends of the work are centered at the centers 17 and 5, respectively.
well supported by a. Here, in this embodiment,
The fixing hole 32 (left side in FIG. 2) and the piston portion 36 (right side in FIG. 2) of the fixed cylinder 35 also serve as the second locking mechanism of the present invention.

As shown in FIG. 1, the grindstone base 7 is a bed 2
It is provided on a mount 37 extending from the side of the mount 9 so as to be slidable in a direction orthogonal to the axis of the camshaft W. At the front of the whetstone stand 7, there is a rotary whetstone 7a.
Are arranged so as to face the camshaft W. Rotary whetstone 7
A drive motor 38 for rotating the rotary grindstone 7a via a belt mechanism is provided behind a. A ball screw mechanism 40 having a drive motor 39 for slidingly moving the whetstone base 7 is connected to the rear portion of the whetstone base 7. By driving the drive motor 39 to move the grindstone base 7 closer to the camshaft W, the camshaft W is ground by the rotary grindstone 7a.

The transfer unit 8 is a predetermined exchange unit 1
9 is used to replaceably slide the work table 9 onto the work table 3, and as shown in FIGS.
A slide base 42 is provided on the top so as to be slidable in a direction orthogonal to the axis of the camshaft W. On the slide base 42, two transfer bases 43 that hold a replacement unit according to the type of camshaft so as to be slidable along the axial direction of the camshaft W are mounted.
The two are fixedly arranged apart from each other in the sliding direction.

The transfer table 43 has an inverted trapezoidal cross section similar to the guide section 12 of the work table 3, and its upper surface 45 and slopes (not shown) on both left and right sides, respectively. It serves as a slide guide surface of the replacement unit 19. Further, the slide base 42 has a shift cylinder 44
Are connected. By driving the shift cylinder 44, each transfer table 43 is integrally shifted in the sliding direction of the slide table 42, and the predetermined transfer table 43 is placed on the extension line of the work table 3 in the sliding direction and the upper surface 45 thereof. Is aligned with the upper surface 13 of the guide portion 12 of the work table 3.

At the center of the front end (left end) of the transfer table 43,
As shown in FIGS. 1 and 2, a through groove 46 penetrating from the upper surface to the lower surface is formed, and a locking lever 47 can be vertically swung in the through groove 46 via a swing shaft 48. It is provided in. The locking claw 4 is provided at the tip of the locking lever 47.
9 is formed, and the locking claw 49 is the replacement unit 19
It is adapted to be engaged with and disengageably engaged with a locking hole 50 formed at the right end of the. The locking claw 49 and the locking hole 50 constitute the first locking mechanism of the present invention. Lock lever 4
A spring 51 for urging the locking claw 49 upward is provided at the rear end portion of 7.
The cylinder 52 is disposed at a position adjacent to the spring 51 with its piston portion abutting on the rear end portion of the locking lever 47. Then, when the piston portion is extended, the locking claw 49 swings downward against the biasing force of the spring 51 and the locking with the locking hole 50 is released. On the other hand, when the piston portion 53 is contracted, The locking claw 49 swings upward and is locked in the locking hole 50.

In such a grinder 1, when the work is changed from the camshaft W to the camshaft of a three-cylinder engine, the replacement unit 19 is arranged so that each workrest corresponds to the camshaft of the three-cylinder engine. 6
The model can be switched to a model corresponding to the work by simply exchanging it with the exchanging unit U whose interval is preset.

To replace the replacement unit 19 with the replacement unit U, first, the work table 3 is slid rightward by the ball screw feeding mechanism 11. Next, the piston portions 36 of the fixed cylinders 34 and 35 are retracted to release the positioning clamp of the replacement unit 19, and the piston portion of the cylinder 52 is contracted to lock the locking claws 49.
Is locked in the locking hole 50 of the replacement unit 19. In this state, when the work table 3 is slid to the left by the pitch of the fixing holes 32 and 33, the replacement unit 19 is locked by the locking claw 49, so that the replacement unit 19 is left at the locking position. The work table 3 slides to the left while keeping the work table 3 stationary, and the piston portion 3
6 is arranged (see FIG. 4).

Next, the piston portion 36 of the fixed cylinder 35
Is inserted into the fixing hole 32 to lock the replacement unit 19 to the work table 3, and the piston portion of the cylinder 52 is extended to disengage the locking claw 49 from the locking hole 50.
When the work table 3 is slid rightward after being detached, the replacement unit 19 is locked to the work table 3, so that the replacement unit 19 moves together with the work table 3 toward the transfer table 43. As a result, the replacement unit 19 is slid and transferred onto the transfer table 43. After being transferred, the piston portion 3 of the fixed cylinder 35
6 is retracted to unlock the exchange unit 19, and the work table 3 is slid to the left to return to the original position.

Next, the transfer cylinders 43 are shifted by the shift cylinders 44 in the direction orthogonal to the axis of the cam shaft W, and the replacement unit U is positioned on the extension line of the work table 3 in the sliding direction. Next, the work table 3 is slid rightward, the piston portion 36 of the fixed cylinder 35 is inserted into the fixing hole 32 of the replacement unit U, and the replacement unit U is locked to the work table 3. In this state,
When the work table 3 is slid to the left, the replacement unit U is locked to the work table 3,
The replacement unit U is integrated with the work table 3 and retracts to the left to be arranged as shown in FIG.

Next, the piston portion of the cylinder 52 is contracted to lock the locking claw 49 in the locking hole 50 of the replacement unit 19, and the piston portion 36 of the fixed cylinder 35 is retracted to engage the replacement unit U. Release the stop. When the work table 3 is slid to the right in this state, since the replacement unit U is locked by the locking claw 49, the work table 3 is moved to the right with the replacement unit U left in the locking position. The replacement unit U is slide-transferred onto the work table 3 by sliding. Then, the piston portions 36 of the fixed cylinders 34 and 35 are extended to positionally clamp the replacement unit 19 at the set position of the camshaft W, and the replacement of the replacement units 19 and U is completed.

[0033]

As is apparent from the above description, according to the present invention, even if the type of work is changed, the individual intervals of the respective work rests can be set only by exchanging the exchange unit. Therefore, it is possible to eliminate the need for adjusting the individual intervals of the respective work rests, which takes a lot of time.

Further, since the exchange unit is exchanged by the slide transfer between the transfer means and the work table, compared with the conventional case where a crane or the like is used,
The safety of the operator can be secured, and the replacement work can be performed quickly and easily.

Further, in the case where the table feeding means for slidingly moving the work table is provided,
By providing the 2 and 3 locking mechanisms, the replacement unit can be replaced by utilizing the sliding movement of the work table by the table feeding means, so that the replacement work can be performed more quickly and easily, and Since the table feeding means is already installed to move the work in the axial direction with respect to the rotary grindstone by slidingly moving the work table, and to machine the work in the same direction, the table and the transfer table It is not necessary to provide any other driving means when the replacement unit is slid and transferred to and from the table, and therefore, the structure of the device can be simplified and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a plan view of a grinder that is an example of an embodiment of the present invention.

FIG. 2 is a front view of FIG.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is an explanatory diagram for explaining a method of replacing a replacement unit.

FIG. 5 is a plan view of a conventional grinding machine.

[Explanation of symbols]

1 ... Grinding machine, 2 ... Bed, W ... Camshaft, 3 ... Work table, 4 ... Work head, 5 ... Tail stock,
6 ... Work rest, 7a ... Rotating grindstone, 8 ... Transfer unit, 19, U ... Exchange unit, 11 ... Ball screw feed mechanism, 32 ... Fixing hole, 35 ... Fixed cylinder, 43 ... Transfer table, 44 ... Shift cylinder , 49 ... Locking claw, 50 ... Locking hole

Claims (2)

[Claims] 1. A work head for supporting one end of a shaft-like work to impart rotation to the work, a tail stock for rotatably supporting the other end of the work, and a shaft for an intermediate portion of the work. A plurality of work rests arranged at intervals in the direction and supporting a plurality of predetermined axial positions according to the type of the work, and the tail stock and the plurality of work rests are slid along the work axial direction. In a grinder comprising a work table that is movably supported and a rotary grindstone that is movably provided in a direction orthogonal to an axis of the work and that grinds the work by moving closer to the work, The work rest is a replacement unit formed with an axial interval of the work corresponding to the type of the work and formed integrally with the tail stock. , On the extension line of the movement direction of the exchange unit to the other end side of the workpiece, various types of exchange units corresponding to the types of the workpieces are arranged, and a predetermined exchange unit is slidably attached to the work table. A grinding machine, characterized in that a transfer means for transferring is provided. 2. A work head for supporting one end of a shaft-shaped work to impart rotation to the work, a tail stock for rotatably supporting the other end of the work, and a shaft for an intermediate portion of the work. A plurality of work rests arranged at intervals in the direction and supporting a plurality of predetermined axial positions according to the type of the work, and the tail stock and the plurality of work rests are slid along the work axial direction. A work table that movably supports, a table support base that slidably supports the work table along the axial direction of the work, and a table feed unit that slides the work table along the axial direction of the work. And a rotary whetstone movably provided in a direction orthogonal to the axis of the work to grind the work by moving closer to the work. In a grinding machine provided with the plurality of work rests, an interval between the works in the axial direction is set so as to correspond to the type of the work, and the work rest is an exchange unit integrally formed with the tail stock. On the extension line of the movement direction of the table to the other end side of the work, there are arranged different types of exchange units which are arranged on the extension line so that a predetermined exchange unit can be slidably transferred to the work table. The plurality of transfer tables are arranged in a direction orthogonal to the axis of the work and are movable in the same direction, and each transfer table is attached to the axis of the work. Shift means is provided for moving a predetermined transfer table on the extension line by moving the transfer table in a direction orthogonal to the transfer table, and the transfer table can be detachably engaged with the end portion of the exchange unit on the work table. A first locking mechanism for locking is provided, and the work table is releasably locked to the work table when the replacement unit is locked by the first locking mechanism. A second locking mechanism and a third position that locks the replacement unit to the work table in a detachable manner at the set position of the work.
A grinding machine having a locking mechanism.