JPH0957620A - Plane belt grinding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plane belt grinding machine which can perform the dressing operation automatically in the condition that a polishing belt is set in place. SOLUTION: A dressing device 10 for a polishing belt 11 and a belt oscillating unit 22 to swing the belt 11 oscillatorily are installed between a contact wheel 12 and idle pulley 13 on which the belt 11 is set over. The dressing device 10 is composed of a backup roll installed on the rear surface of the belt 11, a dresser installed on the grinding surface side of the belt 11, and a dresser drive unit to press the dresser in a specific amount to the backup roll while the belt 11 is pinched. The dressing operation is performed by the dressing device 10 in the condition that the belt 11 ia swinging oscillatorily, and thereby the load on the head motor 15 at the time of dressing is reduced and the lifetime of the belt 11 is prolonged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat belt grinder used for deburring and surface finishing plate-shaped parts, and more particularly to a flat belt grinder including a dresser device.

[0002]

2. Description of the Related Art In a conventional general-purpose surface belt grinder used for deburring plate-like parts, a work (workpiece) continuously conveyed on a conveyor is used. Polishing is performed by a polishing belt that is stretched around the outer periphery of the contact wheel on the lower side of the contact wheel. As a polishing belt used for such processing, there is a cork belt 50 as shown in FIG. The cork belt 50 is formed by adhering cork grains 53 on a base material 51 with an adhesive 52, and minute abrasive grains 55 are also adhered on the surface of the cork grains 53 with an adhesive 54.

Such a cork belt 50 is thicker and more elastic than a normal polishing belt, and in a new state, it is polished by the abrasive grains 55 of the portion closest to the surface. And
While a large number of works are being polished, the abrasive grains 55 fall off from the cork grains 53 and the polishing force is reduced, resulting in a state where the finish of the work is out of the allowable range and processing is defective. For this reason, if the polishing power decreases, replace the belt with a new one, or
You will have to choose between dressing.
When dressing is selected, the tip portion of the cork grain 53 is removed by a dresser, and the abrasive grain 55 on the base material 51 side is removed.
Can be used for polishing to restore the polishing power. Of course, if the cork particles 53 are deleted to some extent, the polishing power cannot be recovered, and in that case, the belt must be replaced with a new belt.

By the way, the size of the work to be polished,
Specifically, when processing a polishing belt that has different dimensions in the width direction, the range of sliding contact between the work and the polishing belt is different, so if you continue to use the polishing belt you have been using until then, the polishing force will increase. Even if it does not drop so much, the polishing power is different between the unused part and the used part, and the finish cannot be made uniform. Therefore, even in such a case, it is necessary to replace the polishing belt or to dress. However, if the polishing belt is selected to be replaced, it takes time to set up and position a new polishing belt. At the same time, there is a problem that the stock quantity of used polishing belts, which is generated by the setup change, increases.

Conventionally, there is no idea of dressing in a grinding machine, and therefore, there is no one in which a dresser device is provided in the grinding machine, and the belt dressing work is performed by removing the polishing belt and using another device. . In this case, a dummy work is attached to the processing point and dressing is performed by pressing the polishing belt against the dummy work, but it takes time to adjust the initial conditions of the processing point, etc. There is a problem that it takes a lot of experience and additional time to reproduce the mounting state after mounting and re-mounting. Similar problems occur when reusing an already used polishing belt.

The present invention has been made in view of the above problems of the prior art. A dressing device is incorporated in a flat belt grinding machine, and dressing work can be automatically performed with a polishing belt attached. It is an object of the present invention to provide a surface belt grinding machine that can correct a thinning amount and set a processing point.

[0007]

In order to achieve the above object, a surface belt grinding machine according to claim 1 of the present invention comprises:
The polishing belt is wound around the contact wheel and the pulley, the driving force from the drive motor is transmitted to the polishing belt via the contact wheel and is rotated, and the workpiece is ground by the polishing belt at the position of the contact wheel. In a flat belt grinder, a backup roll arranged on the non-polishing surface side of the polishing belt, a dresser arranged on the polishing surface side of the polishing belt, and the dressing belt sandwiching the dresser between the contact wheel and the pulley. Then, a dresser device including a dresser drive unit for pressing a prescribed amount against the backup roll is provided.

A flat belt grinding machine according to claim 2 is
A polishing belt oscillating unit that swings the pulley that swings the polishing belt in the axial direction together with the polishing belt that swings in the axial direction, and performs belt dressing work by the dresser device while swinging the polishing belt. Is characterized by.

Further, in the surface belt grinding machine according to a third aspect of the present invention, a slide unit for supporting the contact wheel, the pulley and the dresser device is reciprocally slidably held on a column, and a slide for driving the slide unit on the column. A drive motor is attached, and the final advance amount of the dresser after repeating dressing is fed back to the slide drive motor, and the position of the slide unit can be changed to correct the thickness of the polishing belt. Is characterized by.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows an overall view of a plate deburring surface finishing machine including two flat belt grinding machines 1, two cup brushes 2 and two wheel heads 3 according to an embodiment of the present invention. In the figure, 4 is an operation panel, 5 is a control plate, 6 is a work transfer conveyor, 7 is a cleaning / air blow booth, and an arrow X in the figure indicates the flow direction of the work.

FIG. 2 is a front view of the flat belt grinding machine 1 in FIG. 1, and FIG. 3 is a side view of the same. This flat belt grinding machine 1
Mainly includes the support drive unit 8 and the polishing belt unit 9
And a dresser device 10. The polishing belt 11 includes a contact wheel 12 and an idle pulley 1.
Head column 1 of support drive unit 8
The rotary driving force from the head motor 15 provided on the No. 4 is transmitted to the contact wheel 12 via the V belt 16 to rotate the polishing belt 11 so that the workpiece W conveyed by the workpiece conveyor 6 is polished. Has become.

The support drive unit 8 further comprises a slide drive motor 17, a speed reducer 18 and a slide feed screw 19, and the rotation of the slide drive motor 17 is transmitted to the slide feed screw 19 via the timing belt 20 and the speed reducer 18. The polishing belt unit 9 is moved up and down.

The polishing belt unit 9 includes a tension cylinder 21 for varying the position of the idle pulley 13 to apply tension to the polishing belt 11, a polishing belt oscillating unit 22, and a dresser device 10.
Is supported by the slide unit 23, and the slide unit 2
3 is attached to the head column 14 of the support drive unit 8 so as to be vertically movable, the support member 24 of the idle pulley 13 is connected to the tension cylinder 21, and the lower end edge of the slide unit 23 is connected to the slide feed screw 19. There is. Appropriate tension can be applied to the polishing belt 11 by pushing the support member 24 upward with the tension cylinder 21.
By rotating the slide feed screw 19, the slide unit 23 can be slid, that is, the entire polishing belt unit 9 can be moved up and down.

4 to 7 show the polishing belt oscillating unit 22. This unit includes a pair of oscillating operation cylinders 25, 25, an oscillating bar 26, a stopper driving cylinder 27, an oscillating amount regulating stopper 28, and a valve 29 for electrically and pneumatically controlling the operation of these components. , 30 is included in the control circuit. Note that FIG. 6 shows an oscillating operation cylinder 25 and an oscillating bar 26 as viewed in the direction perpendicular to the paper surface of FIG.
FIG.

This polishing belt oscillating unit 22
Is to shake the polishing belt 11 in the directions of arrows A and B in FIG. Specifically, while the polishing belt 11 is rotating, the valve 29 is energized by an electric signal to open the oscillating amount restriction stopper 28, and the valve 30 is energized to open the oscillating bar 26 by the oscillating operation cylinder 25. The piston rod 31 of the tension cylinder 21 is centered on the idle pulley 13 connected to the oscillating bar 26, and the polishing belt 11 is moved in the A direction by swinging the neck around the axis C,
Then, an electric timer (not shown) in the control circuit is turned off to perform the reverse operation to the above, and the polishing belt 11 is moved in the B direction to automatically cause the oscillating amount regulating stopper 2
Between 8 and 28, the polishing belt 11 is oscillated.
When the polishing belt 11 is stopped, the stopper driving cylinder 27 moves forward to move the oscillating bar 26 to the center position between the oscillating operating cylinders 25, 25 and stop it.

FIG. 8 shows the dresser device 10 in detail.
The dresser device 10 mainly includes a backup roll 32 disposed on the non-polishing surface side of the polishing belt 11, a dresser 33 disposed on the polishing surface side of the polishing belt 11, and a backup roll 3 with the dresser 33 sandwiching the polishing belt 11.
Dresser drive unit 3 for pressing specified amount to 2
Consists of four.

The dresser drive unit 34 is a drive device for bringing the dresser 33 into and out of contact with the backup roll 32, and is a stepping motor 35, a timing belt 36, a ball screw 37, and an origin switch 38.
And the OT switch 39, the support member 40 of the dresser 33 connected to the ball screw 37 is moved in the vertical direction of FIG. 7 (the horizontal direction in FIG. 2, the vertical direction to the paper surface of FIG. 3) to reciprocate the dresser 33. (Hereinafter, when the dresser 33 moves to the polishing belt 11 side is referred to as forward movement, and when it is separated from the polishing belt 11 is referred to as reverse movement.) The stepping motor 35, the origin switch 38, and the support member 41 for the overshooting restriction switch 39 are connected and fixed to the side edge of the slide unit 23. Reference numerals 42 and 42 in the figure are guide bars for guiding the movement of the support member 40 of the dresser 33.

The backup roll 32 is hardened, the bearing 43 is inserted into the end face thereof, and the non-polished face of the polishing belt 11, that is, the back face is brought into contact with the slide unit 23.
It is fixed to and is used for backing up when the dresser 33 moves forward. Reference numeral 44 in the drawing denotes a bearing support bar.

For the forward / backward movement of the dresser 33, the stepping motor 35 rotates by a preprogrammed amount from the origin position defined by the origin switch 38, and the ball screw 37 rotates by a corresponding amount via the timing belt 36. The dresser 33 is moved forward by a predetermined distance, and the dressing belt 11 is sandwiched between the dresser 33 and the backup roll 32, and the dresser is once retracted from the forward end. Program as you go. This operation is performed while the polishing belt 11 is being vibrated as described above, thereby reducing the load on the head motor 15 during dressing and extending the life of the polishing belt 11.

The final amount of advance of the dresser 33 after repeating dressing, that is, the amount of decrease in the thickness of the polishing belt 11 due to dressing is fed back to the slide drive motor 17 by a controller (not shown), and the position of the slide unit 23 is adjusted. Can be corrected by lowering and bringing it closer to the work transfer conveyor 6 side where the height of the upper surface is fixed.

[0021]

As described above, the surface belt grinding machine according to the first aspect of the present invention includes a backup roll disposed on the non-polishing surface side of the polishing belt, and a polishing surface side of the polishing belt between the contact wheel and the pulley. Since the dresser is composed of a dresser drive unit that arranges the dresser and the dresser with a polishing belt sandwiched between the dresser and a specified amount, the dressing belt can be dressed as it is.
Therefore, there is no need to replace the polishing belt or to perform dressing work by another device, and it is very easy to find a processing position after the dressing work, which is effective. Further, even when the size of the work is changed, it is possible to easily cope with the change by dressing without replacing the polishing belt.

As described above, in the flat belt grinding machine according to the second aspect of the present invention, since the dressing device performs the belt dressing work while swinging the polishing belt, in addition to the above-mentioned common effects, the dressing time is improved. It is possible to reduce the load on the drive motor and to extend the life of the polishing belt.

As described above, in the flat belt grinding machine according to the third aspect of the present invention, since the reduction amount of the thickness of the polishing belt due to the dressing is fed back to the slide drive motor to be corrected, the common effect described above can be obtained. In addition, there is an effect that the work for finding the processing position after the dressing work is almost unnecessary.

[Brief description of drawings]

FIG. 1 is an overall view of a plate deburring surface finishing machine including a flat belt grinding machine and the like according to an embodiment of the present invention.

2 is a front view of the flat belt grinding machine in FIG. 1. FIG.

FIG. 3 is a side view of the same.

FIG. 4 is a side sectional view showing a polishing belt oscillating unit of a flat belt grinding machine.

FIG. 5 is a front view of the same.

FIG. 6 is a plan view showing an oscillating operation cylinder and an oscillating bar of the polishing belt oscillating unit.

FIG. 7 is a circuit diagram showing the control circuit.

FIG. 8 is an enlarged plan sectional view showing a dresser device of a flat belt grinding machine.

FIG. 9 is an enlarged sectional view showing the structure of a cork belt.

[Explanation of symbols]

 1 Plane Belt Grinder 6 Work Conveyor 8 Support Drive Unit 9 Polishing Belt Unit 10 Dresser Device 11 Polishing Belt 12 Contact Wheel 13 Idle Pulley 14 Head Column 15 Head Motor 16 V Belt 17 Slide Drive Motor 19 Slide Feed Screw 20 Timing Belt 21 Tension cylinder 22 Polishing belt Oscillating unit 23 Sliding unit 25 Oscillating working cylinder 26 Oscillating bar 27 Stopper driving cylinder 28 Oscillating amount regulation stopper 31 Tension cylinder piston rod 32 Backup roll 33 Dresser 34 Dresser driving unit 35 Stepping motor 36 Timing belt 37 Ball screw 38 Origin switch 39 Can only regulating switch 50 cork belt A, the flow direction of the axis W workpiece X work of the piston rod of the Yurafu direction C tension cylinder B abrasive belt

Claims (3)

[Claims] 1. A polishing belt is wound around a contact wheel and a pulley, a driving force from a drive motor is transmitted to the polishing belt via the contact wheel, and is rotated, so that the polishing belt is covered by the polishing belt at the position of the contact wheel. In a flat belt grinder for grinding a work piece, a backup roll arranged on the non-polishing surface side of the polishing belt, a dresser arranged on the polishing surface side of the polishing belt, and the dresser are provided between the contact wheel and the pulley. A flat belt grinding machine comprising: a dresser device including a dresser drive unit that presses a specified amount of the polishing belt against the backup roll. 2. A polishing belt oscillating unit for swinging a pulley around which the polishing belt is wound along with a polishing belt around which the pulley is wound, and performs belt dressing work by the dresser device while swinging the polishing belt. The flat belt grinding machine according to claim 1, wherein the flat belt grinding machine is formed as described above. 3. A slide unit for supporting the contact wheel, the pulley and the dresser device is reciprocally slidably held on a column, and a slide drive motor for driving the slide unit is attached to the column to repeat dressing. 3. The thickness of the polishing belt can be corrected by feeding back the final amount of advance of the dresser to the slide drive motor after changing the position of the slide unit. Flat belt grinder.