JPH068121A - Grinding device - Google Patents

Abstract

PURPOSE:To remove efficiently casting burrs near a connected section with a close-fitted section which is located at one end of a cover plate section and formed in ring shape, and eliminate use of tools which require coolant. CONSTITUTION:A grinding device is provided with work rotating mechanisms 20, 24, 26, and 28 which hold a work 10 comprising a disk cover plate section 16 and a ring close fitted section 18 installed projectedly at one end of the cover plate section 16 and also rotating the work 10 around an axis line, a No. 1 rotating grinding wheel 30 for grinding a section 14 which is located at one end of the cover plate section 16 of a work 10 formed in disk or ring shape and also located near the connecting section with the close-fitted section 18, a No. 1 grinding wheel rotating means 32a for rotating the No. 1 rotating grinding wheel 30, No. 1 approach and departure mechanisms 36b and 40 for approaching and departing the No. 1 rotating grinding wheel 30 to and from the work 10, and vertical movement mechanisms 34, 36a, and 38 for moving the No. 1 rotational grinding wheel 30 vertically relative to the work 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grinding machine, and more particularly, to a work having a disc-shaped lid plate portion and a ring-shaped fitting portion projecting on one end surface of the lid plate portion. The present invention relates to a grinding device for grinding.

[0002]

2. Description of the Related Art A manhole cover is an example of a work composed of a disk-shaped cover plate part and a ring-shaped fitting part projecting on one end surface of the cover plate part. The manhole cover is formed by a casting method. However, as shown in FIG. 3, the lid of the manhole is a portion 14 of the lid 10 that comes into contact with the base portion 12 of the manhole, that is, a fitting portion 18 that is a lower end surface of the lid plate portion 16 and is formed in a ring shape. It is necessary to remove the casting burrs near the inside of the connecting part to finish it into a flat surface. Conventionally, this finishing work was performed on a lathe.

[0003]

However, there are the following problems in the work of removing the above-mentioned conventional casting burrs and finishing to a flat surface. When removing burrs with a lathe, there is a problem that the amount of cutting per unit time is small and the workability is poor. In addition, it is uneconomical to supply cutting oil during cutting. Further, there is a problem that the casting burr has uneven projection amounts and often damages the cutting tool.
Therefore, according to the present invention, it is possible to efficiently remove casting burrs near one end surface of the lid plate portion and the connection portion with the fitting portion formed in a ring shape, and use a tool that requires cutting oil. The purpose is to provide a grinding machine.

[0004]

In order to solve the above problems, the present invention has the following constitution. That is, a work rotating mechanism that holds a work that is composed of a disk-shaped lid plate portion and a ring-shaped fitting portion that is provided on one end surface of the lid plate portion and that rotates the workpiece about an axis. And a first rotary grindstone formed in a disc shape or a ring shape for grinding one end surface of the lid plate portion of the work and a vicinity of a connecting portion with the fitting portion, and the first rotating grindstone. A first grindstone rotating means for rotating the rotary grindstone; and a first contact / separation mechanism for moving the first rotary grindstone toward and away from the work.
A vertical movement mechanism for vertically moving the first rotary grindstone with respect to the work is provided. Further, the diameter of the first rotary grindstone may be formed so as to gradually decrease in the direction of one end surface. further,
A second rotary grindstone formed into a disc shape or a ring shape for grinding the outer peripheral surface of the lid plate portion of the work; and a second grindstone rotating means for rotating the second rotary grindstone; A second contact / separation mechanism for contacting / separating the second rotary grindstone with respect to the work may be provided.

[0005]

[Operation] The operation will be described. 1st rotary whetstone
When the contacting / separating mechanism and the up-and-down moving mechanism in combination are moved, the first rotating grindstone is brought into contact with one end surface of the lid plate portion in the vicinity of the connecting portion with the fitting portion formed in the ring shape. It becomes possible. Therefore, it is possible to remove the casting burr of the portion with the first rotating grindstone. Also, the first
If the diameter of the rotary grindstone is formed so as to gradually decrease in the direction of the one end face, it is possible to remove the casting burr of the portion of the work having a small diameter. Further, when the second rotary grindstone is provided, the casting burr on the outer peripheral surface of the work can be removed at the same time.

[0006]

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the present embodiment, a manhole cover (see FIG. 3) is an example of a work composed of a disk-shaped cover plate part and a ring-shaped fitting part projecting on one end surface of the cover plate part. ) Will be described as an example. In FIG. 1, reference numeral 20 denotes a rotary table, which supports the work 10 at its upper portion and is rotatable. The workpiece 10 is positioned at a predetermined position by a member 22 provided on the upper surface of the rotary table 20 so that the axis of the workpiece 10 coincides with the axis of the rotary table 20. Reference numeral 24 denotes a rotary clamp portion, which can be moved up and down by a hydraulic cylinder 26 and can be rotated by a hydraulic motor 28. Rotating clamp 24
The workpiece 10 can be sandwiched between the member 22 and the member 22 by moving downward. Further, when the rotary clamp portion 24 is rotationally driven while the work 10 is clamped, the work 10 rotates horizontally together with the rotary table 20. The rotary table 20, rotary clamp 24, hydraulic cylinder 26,
The hydraulic motor 28 constitutes a work rotating mechanism.

Reference numeral 30 is a first rotary grindstone, which is formed in a disc shape or a ring shape, and has an outer peripheral surface formed in a tapered shape so that the diameter thereof becomes gradually smaller toward the front end surface. The first rotary grindstone 30 is a fitting portion 18 that is provided on the lower surface of the cover plate portion 16 of the work 10 and that projects in a ring shape.
The portion 14 in the vicinity of the inner side of the connecting portion with is ground in the circumferential direction to form a flat surface. The first rotary grindstone 30 is always inclined with respect to the vertical line by an angle A (see FIG. 2).
As clearly shown in FIG. 2, the angle A is an angle at which the outer peripheral surface of the first rotary grindstone 30 can come into line contact with the portion 14 of the work 10 for grinding. This is an angle determined by the taper angle or the like of the outer peripheral surface of the first rotary grindstone 30. The first rotary grindstone 30 is fixed to the movable plate 34 while maintaining this angle A. First
By making line contact with the outer peripheral surface of the rotary grindstone 30 and the portion 14 of the work 10, surface grinding becomes possible, and the working time can be shortened. Further, since the outer peripheral surface of the first rotary grindstone 30 is formed in a tapered shape, the portion 14 of the work 10 having a small diameter can be ground. 32a is the first
This is an electric motor which is an example of the whetstone rotating means of No. 1, and rotates the first rotating whetstone 30. The position of the electric motor 32a is also fixed to the movable plate 34. Reference numeral 36a is a servo motor that constitutes a vertical movement mechanism, and is fixed to a fixed plate 38. The servo motor 36a rotates the screw rod (not shown) to move the movable plate 34 up and down along the fixed plate 38. By the vertical movement of the movable plate 34, the first rotary grindstone 30 can be vertically moved with respect to the work 10.

A first movable base 40 has a fixed plate 38 fixed to its upper surface. The first movable base 40 is movable in the left-right direction with respect to the main body base 42. Reference numeral 36b is a servo motor which constitutes a first contact / separation mechanism, and horizontally drives the first movable base 40 along the main body base 42 by rotationally driving a screw rod (not shown),
The first rotary grindstone 30 can be moved toward and away from the work 10. Reference numeral 44 denotes a second rotary grindstone, which is formed in a disc shape or a ring shape, and is provided for grinding the outer peripheral surface 46 (see FIG. 2) of the lid plate portion 16 of the work 10 by the left end surface. Reference numeral 32b is an electric motor which is an example of a second grindstone rotating means, and rotates the second rotary grindstone 44 about an axis.

Reference numeral 48 is a gear motor, which moves the grindstone cover 52 forward and backward via a shaft 50. 54 is a second movable base, and the second rotary grindstone 44, the electric motor 32b, etc. are fixed to the upper surface. The second movable base 54 is movable in the left-right direction with respect to the main body base 42. Reference numeral 36c is a servo motor that constitutes a second contact / separation mechanism, and horizontally drives the second movable base 54 along the main body base 42 by rotationally driving a screw rod (not shown).
The second rotary grindstone 44 can be moved toward and away from the work 10.

Next, the operation of removing the casting burrs on the portion 14 and the outer peripheral surface 46 of the work 10 by the grinding apparatus having the above structure will be described with further reference to FIG. The grinding device of this embodiment is controlled by an NC controller (not shown) having a microcomputer. When the work 10 is clamped on the rotary table 20 and the rotary clamp portion 24 rotates, the work 10 also rotates in the horizontal plane. This rotation may be continuous rotation in the same direction, reciprocal rotation in the forward and reverse directions, or a combination of both. At that time, the upper end position of the first rotary grindstone 30 is located below the lower end surface of the fitting portion 18 of the work 10, and the first movable base 40 is moved toward the work 10 while maintaining the same height position. Move forward to (first motion). When the first movable base 40 moves forward by a predetermined amount, the movable plate 34 is raised so that the outer peripheral surface of the upper end of the first rotary grindstone 30 is moved to the work 10.
The portion 14 is brought into contact (second operation). The first movable base 4 while maintaining the height position of the first rotary grindstone 30.
0 further advances toward the workpiece 10 (third operation). This makes it possible to polish the entire circumference of the portion 14.

Arrows B, C and D show movement patterns of the above-mentioned first operation, second operation and third operation. Note that the second operation and the third operation may be repeated if necessary. When the entire circumference of the portion 14 has been ground, the upper end position of the first rotary grindstone 30 is lowered below the lower end surface of the fitting portion 18 of the work 10, and the first movable base 40 is retracted once. The grinding of the portion 14 is finished. The outer peripheral surface 46 of the work 10 is ground simultaneously with the grinding of the portion 14. The position of the second rotary grindstone 44 is set to a position corresponding to the outer peripheral surface 46 of the work 10, and the second movable base 54 is moved forward in the direction of the work 10 while maintaining the same height position. The second movable base 54 is advanced by a predetermined amount,
The left end surface of the second rotary grindstone 44 is attached to the outer peripheral surface 46 of the work 10.
Abut and grind. The second rotating grindstone 44 may be brought into contact with the second rotating grindstone 44 continuously or intermittently. In the present embodiment, since the burr on the portion 14 of the work 10 and the outer peripheral surface 46 is removed at the same time, the working efficiency can be improved. Although various embodiments of the present invention have been described above, the present invention is not limited to the above embodiments,
Of course, many modifications can be made without departing from the spirit of the invention.

[0012]

When the grinding apparatus according to the present invention is used,
When the rotary whetstone of No. 1 is moved by combining the first contacting / separating mechanism and the vertical moving mechanism, the first grinding wheel is moved to one end surface of the lid plate portion in the vicinity of the connecting portion with the fitting portion formed in the ring shape. It is possible to bring the rotating grindstone into contact. Therefore, since the casting burr in the relevant portion can be removed by the first rotary grindstone, the casting burr in the vicinity of the connecting portion can be efficiently removed, and a grinding device that does not use a tool that requires cutting oil can be provided. Can be provided. Further, if the configuration of claim 2 is adopted, the diameter of the first rotary grindstone gradually decreases in the direction of the one end surface, so that it is possible to remove the casting burr of the portion of the work having a small diameter. . Further, by adopting the configuration of claim 2 and providing the second rotary grindstone, the casting burr on the outer peripheral surface of the work can be removed at the same time, and the working efficiency can be remarkably improved.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a grinding device according to the present invention.

FIG. 2 is a partial front view showing a state in which a work is being ground.

FIG. 3 is a partial cross-sectional view showing a structure of a manhole cover which is a work.

[Explanation of symbols]

 10 Lid which is a Work 14 Grinding Part 16 Lid Plate Part 18 Fitting Part 20 Rotary Table 24 Rotary Clamp Part 26 Hydraulic Cylinder 28 Hydraulic Motor 30 First Rotating Wheel 32a, 32b Electric Motor 34 Movable Plate 36a, 36b, 36c Servo Motor 38 Fixed plate 40 First movable base 44 Second rotary grindstone 46 Outer peripheral surface 54 Second movable base

Claims (3)

[Claims] 1. A work, which is composed of a disk-shaped lid plate portion and a ring-shaped fitting portion projectingly provided on one end surface of the lid plate portion, is held, and the workpiece is rotated about an axis line. A work rotating mechanism; and a first rotating grindstone formed in a disc shape or a ring shape for grinding one end surface of the cover plate portion of the work and a portion near a connecting portion with the fitting portion, A first whetstone rotating means for rotating a first rotary whetstone; a first contact / separation mechanism for moving the first rotary whetstone in and out of contact with the work; and the first rotation. A grinding apparatus comprising: a vertical movement mechanism for vertically moving a grindstone with respect to the work. 2. The grinding apparatus according to claim 1, wherein the diameter of the first rotary grindstone is formed so as to become gradually smaller toward one end face. 3. A second rotary grindstone formed in a disk shape or a ring shape for grinding the outer peripheral surface of the cover plate portion of the work, and a second rotary grindstone for rotating the second rotary grindstone. The grinding apparatus according to claim 1 or 2, further comprising: a grindstone rotating means; and a second contact / separation mechanism for moving the second rotary grindstone toward and away from the work.