JPS632287Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a grinder that grinds the surface of a workpiece by rotating a grinding tool at high speed.

In recent years, attempts have been made to attach a grinder to an industrial robot to automatically grind the surface of a workpiece. When the burr is removed from the casting by moving it, the outer dimensions of the casting vary and the grinding tool is worn out, so the burr is often removed too much or left uncut.

The present invention was developed in view of the above-mentioned circumstances, and it is an object of the present invention to provide a grinder that can absorb variations in the external dimensions of workpieces and deviations due to wear and tear of the grinding tool. Hereinafter, one embodiment of the present invention will be described in detail based on the drawings. Reference numeral 1 denotes a cylindrical casing oriented in the vertical direction, and a mounting portion 2 is integrally provided on the outer surface of the body of the casing 1 in a protruding manner. Also, inside the casing 1, as shown in FIG. 2, three arc-shaped leaf springs 3 are fixed at their respective outer ends to the inner surface of the casing 1 at equal intervals, forming a spiral shape as a whole. Further, a cylindrical bearing case 4 is attached to the casing 1 at the inner end of the leaf spring 3.
It is installed concentrically with the As shown in FIG. 1, the bearing case 4 extends vertically and penetrates the casing 1.

A rotary shaft 6 oriented in the vertical direction is rotatably provided in the bearing case 4 via bearings 7 and 8, and an air motor 9 mounted on the upper end of the bearing case 4 is connected to the upper end of the rotary shaft 6. The output shaft is connected, and the lower end has an inverted conical grindstone 10.
is attached via a chuck 11. 1
A bearing holder 2 is screwed onto the lower end of the bearing case 4.

The device configured as described above is attached to an industrial robot (not shown) that is taught to move along the contour of the burr on the casting, and the grinding wheel 10 is moved perpendicularly to the burr on the casting (not shown). While pressing the whetstone 10 against the surface of the casting with burrs, the air motor 9 is driven to rotate the whetstone 10 via the rotating shaft 6 and the robot is operated, so that the whetstone 10 rotates and moves along the contour of the casting. be done. In this case, whetstone 1
0. Since the bearing case 4, air motor 9, etc. are elastically supported by the spiral leaf spring 3, and the grinding wheel 10 is pressed against the casting surface by the repulsive force of the leaf spring 3, the grinding wheel 10 is The grinding wheel 10 is moved in the direction of the casting in response to variations in external dimensions of the casting and deviations due to wear of the grinding wheel 10, and is constantly in contact with the surface of the casting with a nearly constant force. It is moved along the contour of the casting while absorbing accurately and scraping off burrs.

In the above embodiment, the rotating shaft 6 is rotated by the air motor 9, but an electric motor may also be used. Further, the grindstone 10 may be another grinding tool such as a file. Furthermore, this device may be used by pointing in any direction within 360 degrees. Furthermore, the bearing case 4 is
Although it is supported by two leaf springs 3, 3, any number of leaf springs may be used as long as it is two or more.

As is clear from the above description, the present invention provides a rotating means for rotating a grinding tool inside a cylindrical casing via a plurality of arc-shaped leaf springs spirally arranged at equal intervals. Since this is an elastically supported grinder, when this grinder is attached to an industrial robot that has been taught and grinding is performed, the grinding tool will shift appropriately in response to variations in the external dimensions of the workpiece and deviations due to wear and tear of the grinding tool. This has excellent practical effects, such as absorbing the deviation and preventing over-cutting such as burrs and the occurrence of uncut parts.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a partially sectional front view, and FIG. 2 is a sectional view taken from A to A in FIG. 1. 3: Leaf spring, 4: Bearing case, 6: Rotating shaft, 9: Air motor, 10: Grindstone.

Claims (1)

[Scope of utility model registration request] In a grinder that grinds the surface of a workpiece by rotating a grinding tool, a rotating means for holding and rotating the grinding tool is connected to a cylinder via a plurality of arc-shaped leaf springs arranged in a spiral shape at equal intervals. A grinder characterized by elastic support within a shaped casing.