JPH05220662A - Polishing device - Google Patents

Abstract

PURPOSE:To smoothly push a grinding wheel at the time of bringing it into contact with a workpiece such as lengthy pipe in the initial stage of polishing, and ensure the polishing. CONSTITUTION:A grinding wheel 23 is gently moved closer to a lengthy pipe T side by a rotatable drum 29 and a chain 30 in the state where the grinding wheel 23 is energized in the direction of the lengthy pipe T by an air cylinder 23 and separated from the lengthy pipe T, whereby the grinding wheel 23 can be smoothly brought into contact with the lengthy pipe T.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polishing apparatus for pressing a rotating grindstone against a work material (for example, an outer peripheral surface of a long tube having a different diameter) to polish the work material.

[0002]

2. Description of the Related Art Conventionally, when polishing the outer peripheral surface of a long tube, a rotating disk-shaped grindstone is pressed against the outer surface of the long tube supported by a blade and a backup roller. By moving along the axis of the long tube, the long tube was rotated and the outer peripheral surface was polished.

[0003]

By the way, in this case,
In the conventional polishing apparatus, it is not possible to gently press the whetstone at the time of contacting the outer peripheral surface of the long tube at the beginning of polishing, a large load is applied to the whetstone and the long tube, and smooth polishing can be performed. There is a problem that it is difficult to do.

The present invention has been made in view of the above circumstances. An object of the present invention is to allow a grindstone to be smoothly pressed against a work material such as a long pipe at the beginning of grinding, so that the grindstone can be pressed smoothly. The object of the present invention is to provide a polishing apparatus capable of reliably performing the above.

[0005]

In order to achieve the above object, the first aspect of the present invention provides a polishing apparatus for pressing a rotating grindstone against a work material rotated at a fixed position to polish the work material. In the above, the grindstone is provided with a pressing means for moving the grindstone closer to and away from the work material, and a movement adjusting means for adjusting the moving speed and the allowable range of the grindstone is connected to the grindstone. is there. According to a second aspect of the present invention, the pressing means comprises a cylinder for pressing the grindstone against the work material with a constant pressure. further,
According to a third aspect of the present invention, measuring means for measuring the outer diameter of the grindstone is provided in the vicinity of the grindstone, and the peripheral speed of the grindstone is controlled to be constant based on the outer diameter of the grindstone measured by the measuring means. A control means is provided.

[0006]

According to the first aspect of the polishing apparatus of the present invention, the pressing means urges the grindstone toward the work material, and the grindstone is separated from the work material by the movement adjusting means. By gently moving the grindstone closer to the work material side, the grindstone can be brought into smooth contact with the work material. Further, according to claim 2 of the polishing apparatus of the present invention, stable polishing is performed by pressing a grindstone against a work material with a cylinder adjusted to have a constant pressure. Further, according to claim 3 of the polishing apparatus of the present invention, the outer diameter of the grindstone is measured by the measuring means, and the peripheral speed of the grindstone is made constant by the control means based on the measurement result. The polishing conditions for the work material are kept constant.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is an explanatory view of a whetstone contact mechanism portion of a polishing apparatus showing an embodiment of the present invention, FIG. 2 is a schematic side view explaining a mechanism for keeping the peripheral speed of the whetstone constant, and FIG. 3 is the above. It is a front view of a polishing device. Then, as an object to be polished by this polishing apparatus, for example, a different diameter long tube T as shown in FIG. 4 can be cited. The long tube T has a small diameter portion 2 formed at two locations on the tube body 1 and a taper portion 4 between the small diameter portion 2 and the large diameter portion 3. 1 to 3, reference numeral 10 is a base, on which a pair of parallel guide rails 11 are laid, and two moving bodies 12 slide on the guide rails 11. The movable body 12 is movably provided, and a feed screw shaft 13 is screwed to the lower portion of each of the movable bodies 12. A motor (not shown) is connected to each of the feed screw shafts 13, and each moving body 12 is connected by each motor.
Are independently movable along the guide rail 11. A set of guide rails 14 is laid on each of the moving bodies 12 in a direction orthogonal to the guide rails 11, and a movable body 15 is slidably provided on each of the guide rails 14. Has been. Further, a feed screw shaft 16 is screwed to the lower portion of each movable body 15, a motor 17 is connected to one end of the feed screw shaft 16, and a potentiometer 18 is connected to the other end.
A liquid receiving tank 19 and a pair of support members 20 are provided on each of the movable bodies 15, and a support arm 21 vertically swings at a fulcrum F above the support members 20. It is provided freely. Further, a grindstone shaft 22 is rotatably connected to the lower end of each of the support arms 21, a grinding wheel (grinding wheel) 23 is attached to one end of the grindstone shaft 22, and a pulley 24 is attached to the other end. A motor 27 for rotating a grindstone installed above the support arm 21 is connected via a belt 25 and a pulley 26. Further, on each of the movable bodies 15, a pressing air cylinder 28 for horizontally swinging the support arm 21 from a vertical line by a predetermined angle is horizontally arranged, and a rotatable drum 29 is provided. A chain 30 is provided between the outer edge portion 29a of the drum 29 and the grindstone shaft 22.
Are connected. Then, by rotating the drum 29, the grindstone shaft 22 (the grindstone 2 through the chain 30).
The moving speed and allowable range of 3) are adjusted.

A support frame 31 is provided on the base 10, and a long tube T is provided at the tip of the support frame 31.
A blade 32 for mounting the is installed. A backup roll 33 that supports the long tube T from the side is provided on the side of the blade 32.
An air cylinder 34 for detection is provided at the base end of the support frame 31.
Reference numeral 4 is a double rod type in which piston rods project from both ends thereof. The detection rod 35 is connected to the tip of one piston rod, and the detector 36 is attached to the tip of the other piston rod. Further, a limit switch 37 is installed on the support frame 31 so as to face the detector 36.

When the small diameter portion 2 and the taper portion 4 (A and B portions in FIG. 4) of the long tube T are polished by using the polishing apparatus configured as described above, first, both grindstones 23 are removed. Perform the operation to install each in the reference position. That is, the moving body 12 is driven by the motor (not shown).
Are moved along the pair of guide rails 11 to move the grindstone 23 along the axis of the grindstone shaft 22, and the piston of the air cylinder 34 in the state where the outer peripheral surface of the grindstone 23 faces the detection rod 35. By operating the rod, the detection rod 35 is brought closer to the grindstone 23 side (see FIG. 2). As a result, the detector 36 comes into contact with the limit switch 37. In this state, the motor 17 moves the movable body 15 along the pair of guide rails 14 to bring the grindstone 23 into contact with the tip end surface of the detection rod 35 to detect the detection rod 3.
Push back 5. As a result, when the tip end surface of the detection rod 35 and the outer peripheral surface of the grindstone 23 in a state where the air cylinder 28 is not energized reaches a predetermined optimum distance L, the detector 36 moves from the limit switch 37. Then, the detection signal of the limit switch 37 is input to the control mechanism.
As a result, the control mechanism stops the movement of the movable body 15 by the motor 17, installs the grindstone 23 at the reference position, and moves the position of the movable body 15 based on the measurement signal from the potentiometer 18. By indexing and calculating the outer diameter of the grindstone 23,
The rotation speed of the grindstone rotating motor 27 is determined, and the peripheral speed of the grindstone 23 is set to a predetermined value by an inverter control. In this way, the reference positions of the two grindstones 23 are set respectively. The setting operation is performed not only when the grindstones 23 are attached to the grindstone shaft 22, but also at predetermined intervals according to the wear of the grindstones 23 (as shown in FIG.
The axis O of (1) approaches the blade 32 side as the grindstone 23 wears).

Next, the A and B portions of the long tube T are polished by the above grindstones 23. That is, when the long tube T is placed on the blade 32 and is laterally supported by the backup roll 33, when the support arm 21 is swung toward the blade 32 by the air cylinder 28,
The grindstone 23 installed at the reference position approaches the long tube T. At this time, since the end of the chain 30 connected to the outer edge portion 29a of the drum 29 is located far from the long tube T, it is rotated at a predetermined peripheral speed by the inverter control of the motor 27 by the control mechanism. Whetstone 2
3 does not come into contact with the long tube T. In this state, the drum 29 is rotated to move the outer edge portion 29a of the drum 29.
By slowly bringing the end portion of the chain 30 connected to the long tube T close to the long tube T, the grindstone 23 gently contacts the long tube T as the support arm 21 swings, and the air cylinder 28 moves. It is pressed against the long tube T by a constant pressing force. As a result, the long tube T becomes the grindstone 2.
By the rotation of 3, polishing is smoothly started. Then, by moving the moving body 12 along the long tube T by the motor, as shown in FIG.
For, the polishing is performed from the left end of the long tube T toward the right, and for the grindstone 23 on the right side, the polishing is performed toward the right (or left) of the portion B.

In this way, the partial polishing of the long tube T can be carried out smoothly. In this case, the distance between the outer peripheral surface of the grindstone 23 and the long tube T at the reference position is controlled to be constant with respect to the change in outer diameter due to wear of the grindstone 23, and the grindstone 2
By controlling the peripheral speed of No. 3 to be constant while maintaining the pressing pressure of the grindstone 23 to be constant by adjusting the pressure of the air cylinder 28, it is possible to constantly maintain the polishing conditions constant and perform stable polishing. it can. Further, when the polishing is started, the rotatable drum 29 and the chain 30 make the contact of the grindstone 23 with the long tube T as gentle as possible, so that the long tube T and the grindstone 23 are heavily loaded. The polishing can be started smoothly without any trouble.

[0013]

As described above, according to the first aspect of the present invention.
In a polishing device for pressing a rotating grindstone against a work material rotated at a fixed position to polish the work material, the grindstone is provided with a pressing means for moving the grindstone closer to and away from the work material. Since the movement adjusting means for adjusting the moving speed and the allowable range of the grindstone is connected to the grindstone, the grindstone is urged toward the work material by the pressing means, and the grindstone is the work material. In the state where the grindstone is separated from the work piece, the movement of the grindstone is gradually brought closer to the work piece side so that the grindstone can be smoothly pressed against the work piece such as a long pipe at the beginning of polishing. In addition, it is possible to prevent a large load from being applied to the grindstone and the abrasive, and it is possible to surely perform the polishing. Further, according to the second aspect of the present invention, stable grinding can be performed by pressing the grindstone against the work material with the cylinder adjusted to have a constant pressure. Further, according to claim 3 of the present invention, the outer diameter of the grindstone is measured by the measuring means, and the peripheral speed of the grindstone is made constant by the control means based on the measurement result, whereby the work material by the grindstone is The polishing conditions can be kept constant.

[Brief description of drawings]

FIG. 1 is an explanatory view of a grindstone contact mechanism portion of a polishing apparatus showing an embodiment of the present invention.

FIG. 2 is a schematic side view illustrating a mechanism for keeping the peripheral speed of a grindstone constant.

FIG. 3 is a front view of the polishing apparatus.

FIG. 4 is an explanatory diagram showing partial polishing of a long tube.

[Explanation of symbols]

 T Long tube of different diameter (work material) 18 Potentiometer (measuring means) 23 Polishing wheel (grinding stone) 27 Motor 28 Air cylinder (pressing means) 29 Drum (moving adjusting means) 30 Chain (moving adjusting means) 37 Limit switch

Claims (3)

[Claims] 1. A polishing apparatus for pressing a rotating grindstone against a work material rotated at a fixed position to polish the work material, in which the grindstone is pressed toward and away from the work material. A polishing apparatus provided with a means, and a movement adjusting means for adjusting a moving speed and an allowable range of the grindstone is connected to the grindstone. 2. The polishing apparatus according to claim 1, wherein the pressing means is a cylinder that presses the grindstone against the work material with a constant pressure. 3. A measuring means for measuring the outer diameter of the grindstone is provided in the vicinity of the grindstone, and a control means for controlling the peripheral speed of the grindstone to be constant based on the outer diameter of the grindstone measured by the measuring means. The polishing apparatus according to claim 1, wherein the polishing apparatus is provided.