JP2003251550A - Workpiece carrying device for double spindle surface grinder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To hole a workpiece accurately in a desired posture according to the datum of corner holes in a workpiece carrying device for double spindle surface grinders. <P>SOLUTION: A rotary driven carrier disc 5 is provided with a clamp mechanisms 20 as workpiece holders spacedly in its peripheral direction. Each of the clamp mechanisms 20 is inserted into a corner hole 61 of the workpiece W and is of internally expanding type in which the clamp mechanism 20 inserted is expanded in the center directions O2 of the rotary shaft to hold the workpiece W from the inside of the corner hole, and is provided with a fix side clamp member 27, which abuts on one end face of the corner hole 61 in the center direction of the rotary shaft, and a moving side clamp member 28, which can move radial direction and abuts on the other end face. Both of the clamp members 27 and 28 are formed into a form of a wedge having slant faces, which lie on one top of the other, and the width of the clamp mechanism 20 in the center direction O2 of the rotary shaft is expanded due to wedge action by the movement of the moving side clamp 28 in its radial directions. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is provided with a pair of rotating rotary drive carrier discs provided with work holders at circumferential intervals, each work holder holding a work, and facing each other in the grindstone axis direction. The present invention relates to a work carrier device for a double-sided surface grinder that grinds both end surfaces of a work at the same time by passing between grinding wheels.

[0002]

2. Description of the Related Art As a work holder provided in this kind of work carrier device, a work holding hole is formed in a carrier disk and the work is fitted into the holding hole, or the outer peripheral surface of the work is gripped by a clamp claw. There is a clamp method etc.

[0003]

In the former work holding hole method, since the work is held in a state where the position of the carrier disk rotation axis direction is not fixed and is inserted between the grindstones, the work is held between the loading position and the grindstone. The guide plate for regulating and guiding the position of the workpiece in the direction of the rotation axis of the carrier disk must be installed with high accuracy during the transfer process up to and after the grinding process, and until the unloading position after grinding. I have to.

In the latter clamping method, in which the outer peripheral surface of the work is gripped by the clamp claws, it is difficult to fix the cutting allowances at both ends of the work in the axial direction of the grindstone to the desired values.

[0005]

In order to solve the above-mentioned problems, the invention according to claim 1 of the present application is provided with work holders which are circumferentially spaced on a carrier disk which is rotationally driven, and each work holder is provided with a work. In a work carrier device of a double-sided surface grinder that holds and both ends of a work are simultaneously ground by passing between a pair of rotating grindstones facing each other in the axis direction of the grindstone, the work carrier is inserted into a square hole of the work as a work holder. In addition, it is characterized by being provided with an internal expansion type clamp mechanism that expands in the direction of the axis of rotation of the carrier disk and holds the work from the inside of the hole.

According to a second aspect of the present invention, in the work carrier device according to the first aspect, the internal expansion type clamp mechanism includes a fixed side clamp member that abuts against one end face of the work square hole in the direction of the carrier disc rotation axis. , A movable side clamping member which is movable in the radial direction of the carrier disc and abuts against the other end surface of the work square hole, both clamping members being formed in a wedge shape having inclined surfaces overlapping with each other, and the movable side clamping member is the carrier circle. By moving in the radial direction of the plate, the width of the clamping mechanism in the direction of the carrier disc rotation axis is expanded by the wedge action.

According to a third aspect of the present invention, in the work carrier device according to the second aspect, the movable side clamp member is urged by a spring inward in the radial direction of the carrier disc to be in a clamped state. An unclamping cam that the cam roller connected to the moving side clamp member contacts is provided on the same axis as the above, and while the clamping mechanism moves from the unloading position to the loading position by the rotation of the carrier disk, Due to the cam crest, the moving side clamp member moves outward against the spring and maintains the unclamped state.

According to a fourth aspect of the present invention, in the work carrier device according to the third aspect, the clamping mechanism is opposed to the section of the carrier disc which passes between at least the rotating grindstones from the outside in the radial direction of the carrier disc. A work removal prevention guide is provided.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a vertical sectional front view (cross-sectional view taken along the line II in FIG. 2) of a horizontal double-sided surface grinder to which the present invention is applied. The following description will be made assuming that the axial center direction of the rotary shaft center O2) overlaps with the horizontal direction. In the grindstone guard 2 provided in the grinder main body 1, a pair of rotating grindstones 3 are arranged on the left and right sides on the grindstone shaft core O1. Both rotating grindstones 3 linked to the drive motor
Are configured to rotate in opposite directions to each other.

In front of the grindstone guard 2, there is arranged a carrier disc 5 which rotates around a rotary shaft center O2 parallel to the grindstone shaft center O1. Is set to. The carrier disc 5 is supported by both ends, and the left side of the carrier disc 5 is a joint flange 6
Is interlocked with the motor shaft of the carrier drive motor 7 via the boss 8. The right side of the carrier disk 5 is connected via the boss 8 to the support shaft 1
It is rotatably fitted and supported at 0. The support shaft 10 cannot rotate with respect to the shaft support case 11, and the carrier disk rotation shaft core O2
The adjustment screw 12 with a handle is screwed together while being fitted so as to be movable in the direction.
By rotating a, the support shaft 10 and the boss 8 can be moved and adjusted in the axial direction.

FIG. 2 is a sectional view taken along line II-II of FIG. 1, in which the carrier disk 5 is adapted to rotate in the direction of arrow R,
A work supply device 14 is arranged in the front upper part of the carrier disk 5, and a work discharge device 15 composed of a discharge chute or the like is arranged in the front lower part thereof. The work supply device 14 extends between the rotary grindstones 3 in the arrow R direction. A work removal preventing guide 17 that covers the carrier disk 5 from the outside in the radial direction is provided in a section up to the work discharging device 15. Note that the radial direction of the carrier disk 5 will be simply referred to as the "radial direction" in order to prevent redundant text.

As a work holder, a plurality of carrier discs 5 (for example, 10) are provided at equal intervals in the rotation direction R.
Clamp mechanism 20 is provided so as to project outward in the radial direction, and the clamp mechanism 20 is an internal expansion type in which the width in the direction of the rotation axis O2 can be expanded. The cam rollers 21 are arranged so as to be interlocked with each other.

A ring-shaped cam 24 coaxial with the rotary shaft core O2 is arranged on the radially inner side of each cam roller 21.
Each cam roller 21 is in contact with the outer peripheral surface of the cam 24. On the outer peripheral surface of the cam 24, from the unloading position A2 in the vicinity of the work discharge device 15, the work supply device 1
An unclamping cam crest 24a is formed in a section θ1 near 4 to the loading position A1.

The cam 24 has a rotary shaft center O as shown by an imaginary line.
It is fixed to a bracket plate 33 having a hole 32 coaxial with 2 and the rear end of the bracket plate 33 has a grindstone guard 2
Is fixed to the front end face of the.

FIG. 3 is an enlarged vertical cross-sectional front view of the carrier disk 5. The clamp mechanism (work holder) 20 arranged at the outer peripheral end of the carrier disk 5 in the radial direction has a fixed side clamp member 27 and a movable side. It is composed of a clamp member 28.
The fixed side clamp member 27 is fixed to the carrier disk 5, has a through hole 29 that penetrates in the radial direction, and integrally has a fixed side wedge portion 30 that projects outward in the radial direction. The moving-side clamp member 28 is inserted into the insertion hole 29 so as to be movable in the radial direction, and integrally has a moving-side wedge portion 31 projecting outward in the radial direction. Fixed side wedge part 3
0 has a slope formed so that the thickness becomes thinner as it goes outward in the radial direction, and the moving wedge portion 31 has a slope formed as it becomes thinner as it goes inward in the radial direction. Both wedge parts 30 and 31 are arranged so that the slopes overlap from the left and right. Therefore, by pulling the moving side clamp member 28 inward in the radial direction, the lateral width of the wedge portions 30 and 31 (rotating shaft core O2
The width D in the direction can be expanded.

The inward radial end of the moving side clamping member 28 is connected to the clamping force transmitting plate 34 by means of a concave and convex engagement, and the transmitting plate 34 is movable in the groove 35 of the carrier disk 5 in the radial direction. And is extended inward in the radial direction, and a slide block 37 is fixed to the inner end. A roller support shaft 39 parallel to the direction of the rotation axis O2 is fixed to the slide block 37, and a clamp coil spring 40 is pressed against the slide block 37 from the outside in the radial direction. Through the block 37 and the clamp force transmission plate 34, the moving side clamp member 28 is urged inward in the radial direction (clamping side).

The cam roller 21 is rotatably supported on the roller shaft 39 via a needle bearing 42. The cam roller 21 pushes the cam roller 21 radially outward against the clamp coil spring 40. By moving, the moving side clamp member 28 is moved to the outside in the radial direction via the transmission plate 34, and the work W is unclamped.

FIG. 4 is a view taken in the direction of arrow IV in FIG. 3, in which the fixed side clamp member 27 is formed in an inverted T shape, and inclined surfaces are formed at both ends in the rotation direction R, and both inclined surfaces are held by a metal fitting. It is fixed to the carrier disk 5 by pressing it with 45.

Clamping mechanism 20 in the embodiment
Is manufactured as a work W for gripping a rocker arm of an engine as indicated by an imaginary line. The work (rocker arm) W has a boss portion 60 that fits on a rocker arm shaft and also has an arm. A square hole 61 for inserting an arm support, which is orthogonal to the axial direction of the boss portion 60, is provided in the middle of the boss portion 60, and the workpiece is gripped by the internal expansion type clamp mechanism 20 using the square hole 61. ing. Further, in order to stabilize the posture of the work W having the boss portion 60 and the arm as described above, the fixed side clamp member 27 is formed with an upward U-shaped boss seat 48 that supports the boss portion 60 of the work W. At the same time, an arm seat 49 for supporting the arm is formed.

FIG. 5 is an enlarged view of arrow V in FIG. 3, in which the square hole 61 of the work W is formed in a rectangular shape, and the fixed side wedge portion 30 inserted into the square hole 61 is on the left side of the square hole 61. Abutting on the wall surface, the moving side wedge portion 31 abuts on the right wall surface of the square hole 61.

FIG. 6 is an enlarged sectional view taken along line VI-VI of FIG. 3, in which the clamping force transmission plate 34 is arranged in the groove 35 of the carrier disk 5 and is held by the grooved cover 5a as described above. . The grooved cover 5a is fitted in a recess 51 formed in the carrier disk 5 and is fixed by a bolt 52.

[0022]

First, the flow of the work W in the grinding work will be described. In FIG. 2, the work supply device 14 is attached to each clamp mechanism 20 of the carrier disk 5 that rotates in the direction of arrow R.
To sequentially grind the workpiece W at the clamp position A1 by passing the workpiece W between the rotary grindstones 3 in the clamped position A1, and at the same time, to grind the workpiece W at the unclamped position A2. It is unclamped and then discharged to the discharge device 15.

The operation of the clamp mechanism 20 will be specifically described. [Work Supply Position] In FIG. 2, when the clamp mechanism 20 reaches the work supply device 14, the cam roller 21 is in an unclamped state by riding on the cam crest 24a, and the clamp mechanism in the unclamped state. As shown in FIG. 4, the square hole 61 of the unprocessed work W is fitted into the shaft 20.

[Clamping position A1] At the clamping position A1 in FIG. 2, the cam crest 24a ends, so that the moving side clamping member 28 moves inward in the radial direction by the elastic force of the coil spring 40 as shown in FIG. The lateral action D of the wedge portions 30 and 31 is expanded by the wedge action. This allows
The left and right inner surfaces of the square hole 61 of the work W are clamped from the inside. At this time, the left and right overhanging amounts of the work are determined with reference to the left end surface of the fixed wedge portion 30, so that the left and right cutting allowances of the work W can be accurately distributed to desired values. Further, since the moving side clamp member 28 is clamped by pulling it inward in the radial direction, the work W is pulled inward in the radial direction at the same time as the clamping operation, and the boss portion 60 and the arm of the work W in FIG. The workpieces W can be reliably pressed against the seats 48, 49, and the work W can be accurately fixed in a predetermined posture.

[Grinding process] In FIG.
While passing through the space, the clamped state is maintained,
Both surfaces of the work are ground simultaneously.

[Unclamping position A2 and discharging position] At the unclamping position A2 in FIG. 2, the cam roller 21 rides on the cam crest 24a so that the cam roller 2 in FIG.
1 moves outward in the radial direction against the spring 40, whereby the moving-side clamp member 28 moves outward in the radial direction to be in an unclamped state, and then the discharging device 15 in FIG. Is released.

In this embodiment, since the work W is gripped by utilizing the elastic force of the coil spring 40 as shown in FIG. 3, for example, when the coil spring 40 is damaged, when the fatigue limit is reached, or the cutting margin is extremely large. There is a possibility that the work W may come out to the outside in the radial direction when a large amount of work is inserted and cannot be endured by the clamping force of the coil spring 40. However, as shown in FIG. Is arranged from the work supply device 14 to the work discharge device 15, so that the removal can be prevented.

[0028]

Other Embodiments of the Invention (1) Although the embodiments of FIGS. 1 and 2 show an example in which the present invention is applied to a horizontal work carrier device, a carrier disk rotates about a vertical axis. It is also possible to apply it to a vertical work carrier device.

(2) It is also possible to have a structure in which the lateral width of both wedges is expanded and the square hole of the work is clamped by pushing the moving side clamping member outward in the radial direction.

[0030]

As described above, according to the present invention, (1) as a work holder provided on the carrier disc, the work shaft is inserted into the square hole 61 of the work W and the rotation axis O
Since the internal expansion type clamp mechanism 20 that expands in two directions and grips the work W is provided, the work W can be ground according to the square hole reference instead of the outer shape reference. By setting the respective cutting allowances on both sides in the core direction individually, it is possible to easily obtain the distribution accuracy from the center of the workpiece to the both sides in the core direction of the rotary shaft.

(2) Since the clamp mechanism 20 is inserted into the square hole 61 of the work W and the work W is fixed by the internal expansion method, compared to the clamp mechanism that clamps the outer peripheral surface of the work W, the carrier disk 5 is fixed. The members for the clamp mechanism to be arranged can be compactly arranged, whereby the number of work holders (clamp mechanism) attached to one carrier disk can be increased.

(3) The wedge portion 30 of the clamp member 27 on the fixed side that abuts the internal expansion type clamp mechanism 20 on one end face of the square hole 61 of the work W in the direction of the rotation axis O 2 and the rotation axis O.
The wedge portion 31 of the moving-side clamp member 28 that abuts the other end face in the two directions, and the slopes of both clamp members 27, 28 are overlapped, the wedge portion 30,
31 is a rotary shaft center O while maintaining a rectangular cross section as a whole.
By expanding in two directions, the slopes of the wedge portions 30 and 31 do not come into contact with the square holes 61 of the work W, and the work can be reliably clamped.

(4) A cam roller for connecting the moving-side clamp member 28 to the moving-side clamp member 28 on the same axis as the carrier disc 5 by urging the moving-side clamp member 28 inward in the radial direction by the spring 40. An unclamping cam 24 with which 21 abuts is provided. While the carrier disc 5 rotates to move the clamping mechanism 20 from the unloading position to the loading position, the cam crest 24a of the cam 24 causes the moving side clamping member 28 to spring. If it is designed to move outward against 40 and release the clamp, the clamping and unclamping action can be automatically performed only by providing the cam roller 21 and the cam 24.

(5) If the work removal preventing guide 17 facing the clamp mechanism 20 from the outside in the radial direction is provided at least in the section of the carrier disk 5 that passes between the rotary grindstones 3, fatigue of the spring 40 or Due to the large shaving allowance, even when the elastic force of the spring cannot maintain the clamped state, it is possible to prevent the spring from coming out of the clamp mechanism 20.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of a horizontal double-sided surface grinder to which the present invention is applied.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a vertical front enlarged view of a carrier disc.

FIG. 4 is a view on arrow IV in FIG.

5 is an enlarged view of FIG. 3 as seen from the direction of arrow V. FIG.

6 is a sectional view taken along line VI-VI of FIG.

[Explanation of symbols]

1 Grinder main body 2 whetstone guard 3 rotary whetstone 5 carrier disks 7 Drive motor 14 Work supply device 15 Work discharge device 17 Workpiece removal prevention guide 20 Clamp mechanism (work holder) 21 Cam roller 24 ring cam 27 Fixed side clamp material 28 Moving side clamp material 30 Fixed side wedge 31 Moving side wedge part 34 Clamping force transmission plate 40 spring

Claims (4)

[Claims] 1. A rotatively driven carrier disk is provided with work holders at intervals in the circumferential direction, each work holder holds a work, and the work wheels are passed between a pair of rotating grindstones facing each other in the axial direction of the grindstone. In a work carrier device of a double-sided surface grinder that simultaneously grinds both end faces of a work by means of a work holder, the work holder is inserted into a square hole of the work and expanded in the direction of the axis of rotation of the carrier disc to grip the work from the inside of the hole. A work carrier device for a double-sided surface grinding machine, which is equipped with an internal expansion type clamp mechanism. 2. The internal expansion type clamp mechanism comprises a fixed side clamp member that abuts on one end surface of the work square hole in the direction of the carrier disc rotation axis, and a workpiece square hole which is movable in the radial direction of the carrier disc. A moving side clamp member that abuts the end face,
Both clamp members are formed in a wedge shape having slopes that overlap each other, and the moving side clamp member moves in one direction in the radial direction of the carrier disc, so that the wedge action expands the width of the clamping mechanism in the direction of the carrier disc rotation axis. The work carrier device for a double-sided surface grinding machine according to claim 1, wherein 3. A cam roller for connecting the moving-side clamp member to the moving-side clamp member on the same axis as the carrier disc by clamping the moving-side clamp member inward in the radial direction of the carrier disc by a spring. An unclamping cam that abuts against is provided.While the carrier disc rotates, the clamping mechanism moves from the unloading position to the loading position. The work carrier device for a double-sided surface grinder according to claim 2, wherein the work carrier device is adapted to move and maintain an unclamped state. 4. A work withdrawing prevention guide facing the clamp mechanism from the outside in the radial direction of the carrier disk is provided in at least a section of the carrier disk that passes between the rotary grindstones. Work carrier device for a double-sided surface grinding machine as described.