JPH0760631A - Grinding work device - Google Patents

Abstract

PURPOSE:To enhance work accuracy by changing pressing force of a pressing member to a work in the grinding width direction. CONSTITUTION:A pressing member 6 to press a sanding belt 24 against a work W is formed of a rotary roller 34 and a shaping member 35 to change a pressing surface shape continuously or intermittently in the circumferential direction of a rotary roller arranged on the circumferential surface of this rotary roller 34. This pressing member 6 is supported with a pressing frame 5 installed sidably on a turning frame 3 to turn with a turning shaft 4 as its center, and a rotating angle of the rotary roller 34 is selected properly by a servomotor 23 arranged on the pressing frame 5, and a specific pressing surface of the shaping member 35 is opposed to the work, and a turning angle of the turning frame 3 is selected properly, and a grinding quantity is adjusted in the width direction (grinding width direction) of the belt 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for grinding the surface of a work, and more particularly to a grinding apparatus for pressing a grindstone material against a work by means of a pressing member for grinding.

[0002]

2. Description of the Related Art Conventionally, as this type of grinding apparatus,
The back surface of the sanding belt that rotates endlessly is pressed by a treading pad (pressing member) made of an elastic member, and the sanding belt (grinding stone material) is pressed against the surface of the workpiece that moves in parallel or rotates with respect to the treading pad to perform grinding. There is a so-called belt sander machine (see, for example, Japanese Utility Model Laid-Open No. 61-9245 and Japanese Utility Model Laid-Open No. 64-12765).

[Problems to be Solved by the Invention]

However, according to the above belt sander machine, the pressing force of the treading pad against the work acts almost uniformly on the ground surface of the work within the range of the grinding width. There was a problem that it was difficult to secure the desired processing accuracy when there were variations in dimension or hardness in the width direction, or variations in grindability in the sanding belt in the width direction. .

The present invention has been made to solve the above-mentioned conventional problems, and an object thereof is to make it possible to change the pressing force of a pressing member against a work in the grinding width direction. An object of the present invention is to provide a grinding apparatus that greatly contributes to improvement of processing accuracy.

[0005]

In order to achieve the above object, the present invention provides a grinding device for pressing a grindstone material against a work by means of a pressing member to perform grinding, wherein the pressing member includes a rotating roller and a rotating roller. The pressing member is formed of a shaping member that is arranged on the peripheral surface and that changes the pressing surface shape continuously or intermittently in the circumferential direction, and the pressing member is supported by a pressing frame that is arranged so as to be movable back and forth with respect to the workpiece. It is characterized in that it is configured to.

[0006]

In the grinding apparatus configured as described above, the rotating roller is rotated by a predetermined angle to appropriately select the pressing surface shape of the shaping member, and the pressing surface shape of the shaping member is made to face the work. The pressing force can be changed in the grinding width direction, and the grinding amount can be adjusted in the grinding width direction to ensure the desired processing accuracy.

[0007]

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

In FIG. 1 and FIG. 2, 1 is a base fixed on the floor 2, 3 is a turning frame rotatably mounted on a turning shaft 4 extending vertically from the base 1, and 5 is a turning frame. The pressing frame 3 is slidably mounted in the horizontal direction, and a pressing member 6 is rotatably mounted at the tip of the pressing frame 5. Front of the base 1 (right side of the figure)
A work table (not shown) is installed on the floor 2, and the axial work W supported by the work table is driven to rotate about a horizontal axis orthogonal to the swivel axis 4. There is.

A lower end of a bracket 11 is fixed with a bolt 12 to the rear surface of the base 1 opposite to the side facing the work table, and a swivel cylinder is attached to a forked portion 11a at the upper portion of the bracket 11. A base end portion of 13 is rotatably attached using a shaft 14. On the other hand, a bracket 16 is also fixed to the side surface of the swivel frame 3 by using a bolt 15, and a rod 13 of the cylinder 13 is attached to a forked portion 16a of the bracket 16.
The tip of a is rotatably attached using a shaft 17.
That is, the revolving frame 3 rotates left or right around the revolving shaft 3 in accordance with the expansion and contraction operation of the cylinder 13.

The revolving frame 3 has a U-shaped portion 18 whose upper side is open at the side facing the work W supported by the work table. Guide grooves 19, 19 are formed inside the two opposing walls 18a, 18b constituting the U-shaped portion 18, and the pressing frame 5 has its both side portions provided with the guide grooves 19 and 19.
It is slidably fitted in. Further, a pressing cylinder 20 is fixedly provided on the back surface of the vertical wall 18c conceivable at the bottom of the U-shaped portion 18, and the rod 20a extending from the cylinder 20 into the U-shaped portion 18 has a tip end. The pressing frame 5 is connected. As a result, the pressing frame 5 becomes the cylinder 20.
Sliding along the guide groove 19 according to the expansion and contraction of the workpiece W
To move back and forth.

On the other hand, the tip end side of the pressing frame 5 is a bifurcated arm portion 21, and a rotary shaft 22 to which the pressing member 6 is attached is rotatably bridged to the arm portion 21. The rotary shaft 22 extends in a horizontal direction intersecting the sliding direction of the pressing frame 5, and its operation is controlled by a servo motor 23 fixed to the outer surface of the arm portion 21. The pressing member 6 will be described in detail later. Reference numeral 24 is a sanding belt, which is designed to pass through the front surface of the pressing member 6 by a feeding means (not shown) and rotate endlessly. The pressing member 6 uses the sanding belt 24 for the work W.
The pressing force is controlled by the pressing cylinder 20.

Therefore, the turning amount sensor (stroke sensor) 26 is attached to the base 1 via the bracket 25, and the detection plate 27 is attached to the turning frame 3 so as to be able to come into contact with the turning amount sensor 26. ing. The turning amount sensor 26 and the detection plate 27 are for detecting the turning amount of the turning frame 3, and the signal of the turning amount sensor 26 is sent to a controller 40 (FIG. 5) described later.
A stroke sensor 29 is attached to the front end of the revolving frame 3 via a bracket 28, and the stroke talk sensor is attached to the front end of the arm portion 21 of the pressing frame 5.
A detection plate 30 is attached so as to be able to abut on 29. The stroke sensor 29 and the detection plate 30 are for detecting the pressing stroke of the pressing member 6 against the work W.
The signal of the stroke sensor 29 is also sent to the controller 40. Further, an encoder 31 for detecting the rotation angle of the rotary shaft 22 that supports the pressing member 6 is attached to the servo motor 23, and its signal is also a controller.
It is supposed to be sent to 40.

A sensor mount 32 is extended from the front surface of the base 1 to the vicinity of the work W supported by the work base.
A dimension measuring sensor 33 is attached to the tip end thereof so as to face the pressing member 6. This dimension measuring sensor 33 is used for the work W.
The outer diameter of the work piece W is measured by bringing a plurality of measuring elements 33a arranged in the axial direction into contact with the peripheral surface of the work W.
The signal is also sent to the controller 40.

Here, as shown in FIGS. 3 and 4, the pressing member 6 is composed of a rotating roller 34 as a core and a shaping member 35 arranged on the peripheral surface of the rotating roller 34. .
The rotary roller 34 has a shaft hole 36 through which the rotary shaft 22 is inserted at its shaft center, and a key (not shown) is formed in a key groove 36a formed by axially extending the inner surface of the shaft hole 36. When fitted, they are non-rotatably attached to the rotary shaft 22. On the other hand, the shaping member 35 has a convex portion 37 on its surface (pressing surface) for continuously changing the height and width of the rotary roller 34 in the circumferential direction, and a convex portion 37 for continuously changing the height and width of the rotary roller 34 in the circumferential direction. The concave portion 38 for changing the width and the convex portion 37
A flat portion 39 is provided at the boundary between the concave portion 38 and the concave portion 38. The convex portion 37 and the concave portion 38 are provided over approximately half the circumference of the rotary roller 34, and the flat portion 39 is provided only in a narrow range between them. The shaping member 35 is made of an elastic body (rubber), is prepared as a plate member as shown in FIG. 4, and is joined to the rotating roller 34 with an adhesive.

Due to the structure of the pressing member 6, the rotating roller
When the rotation angle of 34 is appropriately selected, the pressing surface (convex portion 37, concave portion 38, flat portion 39) of the specific shape of the shaping member 35 is directed toward the work W, and thus the pressing member 6 is pressed against the work W. The force can be changed in the grinding width direction. Further, when the pressing surface having a specific shape of the shaping member 35 is selected and at the same time the swivel frame 3 is swung by a predetermined angle, the pressing surface moves in the grinding width direction, so that the pressing force to the work W is made wider. You will be able to change.

FIG. 5 shows a control system in this embodiment. In the figure, reference numeral 41 is a hydraulic pressure source including an oil tank 42 and a pump 43, and two hydraulic circuits connecting the hydraulic pressure source 41 to the turning cylinder 13 and the pushing cylinder 20 have supply / discharge valves 44, 45. Are installed respectively. As described above, the controller 40 includes the turning amount sensor 26, the stroke sensor 29, the encoder 31, and the dimension measurement sensor.
The detection signal is input from 33, while
A control signal is output from the controller 40 to the servomotor 23 that rotates the supply / discharge valves 44 and 45 and the pressing member 6. The controller 40 calculates the initial processing amount based on the previously input processing information, calculates the correction processing amount based on the signal from the dimension measurement sensor 33, and further calculates the initial processing amount and the correction processing amount. It has a function to determine the control amount for obtaining (the turning amount of the turning frame 5, the pressing stroke of the pressing member 6, the rotation angle of the pressing member 6) and output the control signal to the supply / discharge valves 44 and 45 and the servo motor 23. is doing.

The operation of the grinding apparatus configured as described above will be described below.

Before grinding, the controller 40
The present dimension data (primary machining dimension data), the grinding allowance, etc. for the portion W'to be ground of the work W are input to the controller 40, and the controller 40 calculates the initial machining amount based on these input data, and also calculates the initial machining amount. The control amount for obtaining is determined, and a control signal is output to each of the supply / discharge valves 44, 45 and the servo motor 23. Then, the revolving cylinder 13 operates to revolve the revolving frame 3 by a predetermined angle, and the pushing cylinder
20, the pushing frame 5 moves forward by a predetermined distance, and further the rotary roller 34 rotates by a predetermined angle so that the pressing surface having a specific shape of the shaping member 35 is directed to the work W. At this time,
Rotation amount sensor 26, stroke sensor 29 and encoder
The operation amount of each element is detected by 31, and the controller 40 feedback-controls each element based on the detection signals.

After completion of the above-mentioned preparation, the work W is rotated by the operation of a work table (not shown), and the sanding belt 24 is rotated by the operation of a feeding means (not shown), so that the work W is ground by the sanding belt 24. The grinding of the portion W'starts. At this time, the pressing force of the pressing member 6 against the portion W ′ to be ground of the work W is changed in the grinding width direction by selecting the pressing surface having a specific shape of the shaping member 35 and turning the turning frame 5 at a predetermined angle. Therefore, the grinding amount is adjusted in the grinding width direction, and the desired processing accuracy is ensured.

However, for example, when the surface to be ground of the workpiece W has a variation in hardness in the grinding width direction, or when the sanding belt 24 has a variation in grindability in the width direction, desired processing accuracy cannot be obtained. Like However, the dimension of the portion W'to be ground of the workpiece W is constantly measured by the dimension measuring sensor 33, and the measurement result is fed back to the controller 40. That is, the controller 40 constantly monitors the machining accuracy, and temporarily stops the machining when the desired machining accuracy cannot be obtained even after the grinding has progressed to some extent. Then, the correction processing amount that obtains the desired processing accuracy is calculated, the control amount for obtaining the correction processing amount is determined, and the control signals are output to the supply / discharge valves 44 and 45 and the servo motor 23. Thereby, the turning amount of the turning frame 3, the stroke amount of the pushing frame 5,
The rotation angle of the rotating roller 34 is corrected, and as a result, the required portion is intensively ground to ensure the desired processing accuracy.

In the above embodiment, since the pressing frame 5 is supported by the swivel frame 3 so that the pressing angle of the pressing member 6 with respect to the work W can be adjusted, in addition to the rotation of the pressing member 6, the swivel frame can be rotated. By rotating 3 the pressing force of the pressing member 6 against the work W can be changed over a wider range, and a fine adjustment of the processing amount becomes possible. Further, by appropriately setting the height of the convex portion 37 and the depth of the concave portion 38 of the shaping member 35 constituting the pressing member 6, it is possible to positively perform the medium convex / concave processing on the work W. it can.

In the above embodiment, the convex portion 37 and the concave portion 38 provided on the shaping member 35 are continuously changed in the circumferential direction of the rotary roller 34. May be continuously changed in the circumferential direction of the rotating roller 34. Further, although the shaping member 35 is joined to the peripheral surface of the rotating roller 34 in the above-described embodiment, the shaping member 35 may be integrally molded by vulcanization with the rotating roller 34. Further, in the above embodiment, the shaping member 35 is formed of an elastic body, but it may be formed of a rigid body such as metal or ceramics. Furthermore, this shaped member
35 may be formed of, for example, a rubber grindstone, and in this case, a sanding belt as a grindstone material becomes unnecessary.

Further, in the above embodiment, the revolving frame 3 is used.
And a cylinder 1 as means for driving the pressing frame 5.
Although 3 and 20 are used, as the driving means, a gear mechanism (rack
A pinion mechanism) can be used. Further, although the application to the peripheral surface machining of the shaft-shaped work W has been described in the above-mentioned embodiment, the present invention can of course be applied to the surface grinding of the flat work. In this case, the work is moved linearly. In addition, the sanding belt 24
In place of rotating endlessly, a fixed pitch may be fed in one direction.

[0024]

As described above in detail, according to the grinding apparatus of the present invention, the pressing member is rotated to appropriately select the pressing surface shape for the work, and the pressing force of the pressing member is adjusted. Since it can be changed in the grinding width direction, the grinding amount can be adjusted in the grinding width direction to ensure the desired processing accuracy,
Its utility value is enormous.

[Brief description of drawings]

FIG. 1 is a plan view showing the structure of a grinding apparatus according to the present invention.

FIG. 2 is a side view showing the structure of the present grinding apparatus.

FIG. 3 is a side view showing the structure of a pressing member used in the present invention.

FIG. 4 is a perspective view showing the shape of a shaping member that constitutes the pressing member used in the present invention.

FIG. 5 is a schematic diagram showing a control system of the present invention.

[Explanation of symbols]

 1 Base 3 Revolving frame 5 Pressing frame 6 Pressing member 13 Revolving cylinder 20 Pressing cylinder 23 Servo motor 24 Dunning belt 34 Rotating roller 35 Shaped member 37 Convex section 38 Recess 40 Controller W work

Claims (1)

[Claims] 1. A grinding apparatus for pressing a grindstone material onto a work by means of a pressing member for grinding, wherein the pressing member is arranged on a rotating roller and a peripheral surface of the rotating roller, and a pressing surface shape is continuously formed in a circumferential direction thereof. And a shaping member that is changed intermittently, and the pressing member is supported by a pressing frame arranged so as to be able to move back and forth with respect to the work.