JPH06198552A - Work feeding method for centerless grinding machine and feeding device - Google Patents

Abstract

PURPOSE:To provide a high feeding efficiency of a work by driving a work loader efficiently in a centerless grinding machine which carries out infeed grinding. CONSTITUTION:Two work loaders 4, 5 moves along the same traveling path between a grinding position A of a work W and a loading/unloading position B, and one work loader 4 carries out a discharging operation of the work W while the other work loader 5 carries out a feeding operation of the work W. Both of the work loaders 4, 5 move intersectionally without interfering with each other around the grinding position A of the work W. In this way, two work loaders 4, 5, which cooperate with each other, are driven efficiently, so that a high speed exchanging operation of the work W in the grinding position A is achieved and non-grinding time in a centerless grinding machine is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a device for supplying a workpiece to a centerless grinding machine, and more specifically,
TECHNICAL FIELD The present invention relates to a technique for efficiently supplying and discharging a workpiece in a centerless grinding machine that performs in-feed grinding.

[0002]

2. Description of the Related Art In-feed grinding of a centerless grinder is a grinding method that is preferably used for so-called stepped workpieces having different outer diameters and workpieces requiring high grinding accuracy. In the grinding, the supply of the work pieces is usually performed by a horizontally moving conveyer conveyor and one work piece loader that moves up and down.

Specifically, when the conveyor conveys the workpiece horizontally and reaches the position above the centerless grinding machine,
A workpiece loader receives the conveyed workpiece, descends, and supplies the workpiece onto a grinding position between the grinding wheel and the adjusting wheel, that is, a blade. The work loader stands by in the vicinity of the grinding position as it is while the work is being ground, and again receives the ground work, lifts it, and discharges it onto the conveyor. After that, the same process is repeated, and the workpiece is sequentially and continuously ground.

[0004]

However, in the method for supplying and discharging the work by one work loader as described above, the transfer with the conveyer at the time of supplying and discharging the work, the transfer to the grinding position, Furthermore, since the work loader is driven intermittently, such as when waiting for the work to be ground, the work supply efficiency is extremely poor, and the grinding efficiency is greatly reduced.

The present invention has been made in view of the above conventional problems, and an object of the present invention is to efficiently drive a work loader in a centerless grinder that performs infeed grinding. The object of the present invention is to provide a workpiece supply method and a workpiece supply apparatus that can obtain a high workpiece supply efficiency.

[0006]

In order to achieve the above object, the method of supplying a workpiece according to the present invention includes two workpiece loaders that follow the same movement path between a workpiece loading / unloading position and a grinding position. One of the workpiece loaders performs a workpiece discharging operation while the other workpiece loader performs a workpiece supplying operation, and both workpiece loaders are provided in the vicinity of the workpiece grinding position. The feature is that they move so as not to interfere with each other.

Further, the work supply apparatus of the present invention executes the work supply method described above, and includes two loader devices for conveying the work between the carry-in / carry-out position and the grinding position. The loader device is provided with a control device for driving and controlling the loader devices in synchronism with each other. The loader device includes a work loader that detachably holds a work, and a drive that moves the work loader horizontally and vertically. And the workpiece loaders of the both loader devices are configured to follow the same movement path between the loading / unloading position and the grinding position. It is configured to drive and control the loader.

[0008]

The two work loaders follow the same movement path between the work loading / unloading position and the grinding position, while one work loader is performing the work discharging operation of the other work loader. The work loader is drive-controlled to perform a work feeding operation.

Moreover, these two work loaders move in a crossing manner so as not to interfere with each other in the vicinity of the grinding position of the work. Specifically, the workpiece loader on the workpiece supply side descends when the workpiece loader on the workpiece discharge side deviates from the workpiece supply path to feed the workpiece to the grinding position.

As described above, by efficiently driving the two work loaders in cooperation with each other, the work of exchanging the work pieces at the grinding position is sped up and the non-grinding time of the centerless grinder is reduced. Plan.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 4 show a workpiece supplying apparatus according to the present invention. Specifically, the workpiece supplying apparatus 1 is such that a workpiece W is between a grinding wheel 2 and an adjusting wheel 3 of a centerless grinder. On the other hand, it is applied to in-feed grinding that is supplied and discharged from above, and is configured with two loader devices 4 and 5 and a control device 6 as main parts. A blade 7 is arranged between the grinding wheel 2 and the adjusting wheel 3 to support the workpiece W at the grinding position A.

The loader devices 4 and 5 carry out a horizontal movement and a vertical movement to convey the work W between the grinding position A and the carry-in / carry-out position B. It is configured.

The work loader 8 detachably holds the work W. Specifically, as shown in FIGS. 3 and 4, the work loader 8 is an air drive unit 10 and a pair of chuck claws 11, 11. The chuck 12 is provided as a main part, and further a pressing member 13 and a positioning part 14 are provided.

The air driving portion 10 of the air chuck 12 is attached to and supported by the loader main body 15 and communicates with an air supply source via an air circuit (not shown). Also,
As shown in FIG. 4, the chuck claws 11, 11 have their upper base end portions 11a, 11a supported so as to be openable and closable with the support shafts 16, 16 as fulcrums, and through the interlocking mechanism (not shown). It is connected to the driving unit 10. on the other hand,
Chuck recesses 11b and 11b are provided inside the lower tips of the chuck claws 11 and 11, respectively, and a part of the workpiece W, that is, a portion deviated from the grinding position is chucked in the chuck recesses 11b and 11b. .

Reference numeral 17 denotes a positioning bolt that defines the maximum expansion range of the chuck claws 11, 11, and the maximum expansion range can be adjusted by operating the positioning bolt 17 to advance and retract. 18 is a chuck claw 1
The proximity switch which detects the closed state of 1 and 11 is shown.

The pressing member 13 serves to assist the chucking state of the air chuck 12, and is attached and fixed to the loader body 15 in a suspended state at the rear side position of the air chuck 12, as shown in FIG. In addition, the lower end surface 13a is a contact support surface that contacts the upper surface of the workpiece W. The height position of the contact support surface 13a is
The workpiece W chucked by the chuck claw 11 is set so as to correspond to the chuck recess 11b of the chuck claw 11, and the upper surface of the workpiece W is abutted and supported by the abutment support surface 13a. Retained.

The positioning portion 14 defines the axial position of the workpiece W, and comprises a pair of front and rear positioning members 19 and 20, as shown in FIG. Both of these positioning members 1
The upper base end portions 19a and 20a of the reference numerals 9 and 20 are attached and fixed to the front and rear positions of the loader body 15 in a suspended state, and the inner side surfaces 19b and 20b of the reference numerals 9 and 20 are the work W.
The front and rear end surfaces Wa and Wb are contact support surfaces.

The loader body 15 includes a rear positioning member 2
Mounting holes 15a and 15a for 0 and mounting holes 15b and 15b for the air chuck 12 and the pressing member 13 are provided. These mounting holes 15a and 15b are both shown in FIG.
The shape of the long hole extends in the front-rear direction as shown in FIG.

By moving the tightening location of the tightening bolt 21 with respect to the mounting hole 15a, the positions of the two contact support surfaces 20b can be adjusted according to the length of the workpiece W, and the mounting hole can be adjusted. The positions of the air chuck 12 and the pressing member 13 can be adjusted by moving the tightening locations of the tightening bolts 22 with respect to 15b.

The drive unit 9 moves the work loader 8 horizontally and vertically, and as shown in FIG.
An apparatus main body 29 that is composed of a pair of ball screws 25 and 26 and a pair of servo motors 27 and 28 that rotationally drive them, and that is installed above the centerless grinding machine.
Is attached to.

The horizontal ball screw 25 is used for the work loader 8
In the horizontal direction. Both ends of the screw shaft 25a are rotatably supported by the bearings 29a and 29b of the device body 29 in a horizontal state, and one end of the screw shaft 25a drives the servomotor 27. It is connected to a shaft (not shown).

Further, as shown in FIG. 2, the nut portion 25b screwed onto the screw shaft 25a so as to be able to move forward and backward is provided along the guide rails 29c and 29c of the apparatus main body 29 in the front-back direction (in the plane of FIG. The lifting / lowering side ball screw 26 is attached to a support member 30 which is movable in the vertical direction) and is attached to the nut portion 25b.

The elevating side ball screw 26 is for vertically moving the work loader 8 in the vertical direction.
6a is rotatably supported on the support member 30 of the nut portion 25b in a vertical state, and its upper end is connected to a drive shaft (not shown) of the servo motor 28. Further, the work loader 8 is attached to the nut portion 26b screwed to the screw shaft 26a so as to be able to advance and retract. The loader arm 35 includes a guide member 37 attached to the apparatus body 29.
Guided by (FIG. 2), it is vertically moved up and down.

Due to the construction of these drive parts 9, the work loaders 8 and 8 of both loader devices 4 and 5 are located between the grinding position A and the loading / unloading position B as shown in FIG. As shown by the arrow, they will follow the same movement route.

The control unit 6 controls both of these loader units 4, 5
Although not shown in the figure, each of them is driven by a microcomputer including a CPU, a RAM, a ROM, an I / O port, and the like, and one workpiece loader 5 performs a discharging operation of the workpiece W. While I was going
The other work loader 4 performs a work supplying operation, and further, both work loaders 4 and 5 are controlled so as to move in a crossing manner so as not to interfere with each other in the vicinity of the grinding position A.

That is, in FIG. 1, when the preceding work W is being ground while being supported on the blade 7, the loader device 5 that has supplied the work W is in the vicinity of the grinding position A (for example, as it is). After waiting at the grinding upper position D), the other loader device 4 waits at the upper waiting position C of the grinding position A after receiving the next workpiece W at the loading / unloading position B.

When the grinding of the preceding work W is completed, the loader device 5 chucks and supports the work W again and moves up to the grinding upper position D (arrow), and then to the carry-in / carry-out upper position E. Then, the loader device 4 is horizontally moved toward it and is separated from the descending path (workpiece supply path) of the loader device 4 (arrow).

Subsequently, the loader device 4 descends as it is (arrow), the next work W is placed on the blade 7, and the grinding position A is maintained while the work W is ground. It is standing by at the position D near.

On the other hand, the loader device 5 for supporting the ground work W further moves horizontally to reach the carry-in / carry-out upper position E (arrow), and then descends to the carry-in / carry-out position B as it is ( (Arrow), the ground work W is discharged onto a carry-out belt (not shown).

Subsequently, the loader device 5 receives the unground workpiece W from the carry-in belt (not shown), moves up to the uppermost position F of the carry-in / carry-out upper position E (arrow), and then the grinding position as it is. It moves horizontally to the upper standby position C of A (arrow) and stands by at this position C.

The series of operations (arrows-) are performed while the workpiece W supplied by the loader device 4 is being ground.

Thereafter, the loader devices 4 and 5 alternately repeat the same steps (to), so that the workpieces W, W, ... Are sequentially and continuously ground.

When the workpieces W having different shapes and sizes are to be ground, the distance between the abutting support surfaces 19b and 20b of the positioning portion 14 and the positions of the air chuck 12 and the pressing member 13 are determined as described above. After adjusting, the horizontal ball screw 25 and the vertical ball screw 26 are drive-controlled corresponding to this new workpiece W. As a result, the new workpiece W is accurately supplied to the newly set grinding position A.

The above-described embodiment is merely a preferred embodiment of the present invention, and the present invention is not limited to this, and various design changes can be made within the range.

For example, the moving paths of the loader devices 4 and 5 are
Other configurations may be adopted as long as they intersect so as not to interfere with each other, or may be configured to follow a movement route opposite to the illustrated example.

In the illustrated example, the loader device 4,
Ball screws 25 and 26 and servomotors 27 and 28 are used as the drive unit 9 of FIG. 5, but in addition to this, a hydraulic actuator such as a hydraulic cylinder or a drive source such as an AC motor that replaces the servomotor is used. It is also possible.

[0038]

As described in detail above, according to the present invention,
Two workpiece loaders that follow the same movement path between the workpiece loading / unloading position and the grinding position, so that one performs the workpiece discharging operation while the other performs the workpiece feeding operation. Drive control to both of these work loaders,
Since the workpieces are moved so as to intersect each other in the vicinity of the grinding position so as not to interfere with each other, both workpiece rotors can be efficiently driven in cooperation with each other.

As a result, the work of exchanging the workpieces at the grinding position is accelerated (1.0 to 1.5 seconds), the non-grinding time of the centerless grinder is reduced, and the grinding efficiency is greatly improved. You can

Further, by using a ball screw and a servomotor as the drive unit of the loader device, the setup adjustment accompanying the change of the workpiece can be easily performed.

[Brief description of drawings]

FIG. 1 is a perspective view showing a schematic overall configuration of a workpiece supply device for a centerless grinding machine according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional front view showing a main part of the workpiece supply device.

FIG. 3 is a side view showing a work loader of the work supply apparatus.

FIG. 4 is a front view showing a work loader of the work supply apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Work supply device 2 Grinding wheel 3 Adjusting wheel 4, 5 Loader device 6 Control device 7 Blade 8 Work loader of loader device 9 Drive part of loader device 12 Air chuck 13 Holding member 14 Positioning part 25, 26 Ball screw 27, 28 Servomotor W Workpiece Wa, Wb Workpiece end surface A Workpiece grinding position B Workpiece loading / unloading position

Claims (4)

[Claims] 1. Using two workpiece loaders that follow the same movement path between a workpiece loading / unloading position and a grinding position, while one workpiece loader is performing a workpiece discharging operation. , The other work loader performs a work supplying operation, and both work loaders move in a crossing manner so as not to interfere with each other in the vicinity of the grinding position of the work. Material supply method. 2. The workpiece loader performs a horizontal movement and a vertical movement, and in the vicinity of the grinding position of the workpiece, the workpiece loader on the workpiece supply side has a workpiece supply path on the workpiece loader on the workpiece discharge side. The method for supplying a work to a centerless grinding machine according to claim 1, wherein the work is supplied when the work is disengaged from the center and the work is supplied to a grinding position. 3. A loader device comprising two loader devices for transporting a workpiece between a carry-in / carry-out position and a grinding position, and a control device for synchronously controlling the drive of both loader devices. A work loader that detachably holds the work, and a drive unit that moves the work loader in a horizontal direction and a vertical direction. The work loaders of the both loader devices both include the loading / unloading position and the grinding position. The control device is configured to follow the same movement path to and from the position, and the control device is configured to drive and control both the work loaders by the method according to claim 1 or 2. Work supply device for centerless grinding machine. 4. The drive section of the loader device comprises a pair of ball screws for moving the work loader in horizontal and vertical directions, respectively, and a pair of servomotors for rotationally driving these ballscrews, respectively. 3. The workpiece supply device for the centerless grinding machine according to item 3.