JP2021045799A - Grindstone cover device for internal grinding machine - Google Patents

Abstract

To provide a grindstone cover device for an internal grinding machine that can prevent the grindstone from scattering due to breakage during setup change.SOLUTION: A grindstone cover device 9 comprises: a spindle stock 2 that supports a spindle 3 that holds a work-piece W; and a fixed cover 10 arranged to face the spindle stock 2 so as to partition between the spindle stock and an inner surface grinding shaft 5 that rotates a grindstone 6 for grinding an inner surface of the work-piece W; a movable cover 11 provided on the fixed cover 10 so as to enable opening and closing an opening that allows the inner surface grinding shaft 5 to advance and retreat; and a moving device 12 for moving the movable cover 11 between an open position and a closed position.SELECTED DRAWING: Figure 1

Description

The present invention relates to a grindstone cover device for an inner grinding machine, and more particularly to a grindstone cover device for an inner grinding machine that protects an operator when performing setup change.

As shown in Patent Document 1, the internal grinding machine is provided with a grindstone cover that can be moved between a cover position that covers the grindstone and a non-cover position that exposes the grindstone. In such a grinding machine, grinding is performed with the grindstone cover moved to the non-cover position, and at the end of grinding, a worker who covers the continuously rotating grindstone with the grindstone cover moved to the cover position and performs setup change. It is designed to prevent contact with the grindstone.

An example of a conventional grindstone cover device for an internal grinding machine is shown in FIGS. 4 and 5.

As shown in FIG. 4, the inner surface grinding machine (1) is arranged so as to face the headstock (2) for holding the work (W) and the headstock (2) to rotate the grindstone (6). A door that opens and closes the grinding shaft (5), the entire cover (7) that covers the headstock (2) and the inner grinding shaft (5), and the opening (7a) for entering and exiting the operator provided in the overall cover (7). It is equipped with (8) and a grindstone cover device (30) that covers the grindstone (6).

The grindstone cover device (30) exposes the grindstone cover (31) that is moved in the grindstone axial direction together with the grindstone (6), the cover position where the grindstone cover (31) covers the grindstone (6), and the grindstone (6). It is equipped with a grindstone cover swivel device (32) that swivels the grindstone cover (31) between non-cover positions.

As shown in FIG. 5B, the grindstone cover (31) at the cover position includes a front wall (33) that covers the front of the grindstone (6) and an upper wall (34) that covers the upper part of the grindstone (6). It has a left wall (35) that covers the side of the grindstone (6) near the opening (7a) for workers to enter and exit.

The grindstone cover (31) swivels the swivel arm (32a) of the grindstone cover swivel device (32) between the non-cover position shown in FIG. 5 (a) and the cover position shown in FIG. 5 (b). Can be moved.

Japanese Unexamined Patent Publication No. 2007-276032.

The grindstone cover (31) shown in FIGS. 4 and 5 is installed to prevent an operator who has entered the setup work space (S) by opening the door (8) from contacting the grindstone (6). However, when the grindstone (6) is damaged, it is not designed to prevent the grindstone (6) from scattering. Therefore, although the scattering of the grindstone (6) due to the breakage during processing can be prevented by the entire cover (7), the scattering of the grindstone (6) due to the breakage during the setup change cannot be prevented. Therefore, it is necessary to reduce the rotation speed of the grindstone to a safe rotation speed and then perform the setup change, and it takes time to reduce the rotation speed of the grindstone, which causes a problem that the manufacturing time of parts is increased.

An object of the present invention is to provide a grindstone cover device for an internal grinding machine capable of preventing the grindstone from scattering due to breakage during setup change.

The grindstone cover device for an internal grindstone according to the present invention includes a headstock that supports a spindle that holds a work, an inner grindstone that is arranged so as to face the headstock and rotates a grindstone that grinds the inner surface of the work, and a spindle. A grindstone cover device provided on an inner grinding machine provided with a base and an overall cover for covering the inner grinding shaft, which is a grindstone cover device for covering the grindstone, and for a fixed cover for partitioning between the headstock and the inner grinding shaft and a fixed cover. It is characterized by including a movable cover that can open and close an opening that allows the provided internal grinding shaft to move forward and backward, and a moving device that moves the movable cover between an open position and a closed position.

According to the grindstone cover device for an inner surface grinding machine of the present invention, by opening the movable cover, the inner surface grinding shaft can be moved forward and backward from the opening provided in the fixed cover. The inner surface of the work can be ground with a grindstone by advancing and retreating. Then, at the end of grinding, the inner surface grinding shaft is retracted from the opening provided in the fixed cover, and the movable cover is closed, so that the space for the operator to change the setup and the grindstone are the fixed cover and the movable cover. Separated by. Therefore, even if the grindstone rotating at high speed is damaged, it is possible to prevent the grindstone from scattering.

According to the grindstone cover device for an inner surface grindstone of the present invention, the inner surface of the work can be ground by the grindstone by opening the movable cover, and the movable cover is closed at the end of grinding. The space where the operator changes the setup and the grindstone are separated by a fixed cover and a movable cover. Therefore, even if the grindstone that rotates at high speed is damaged, it is possible to prevent the grindstone from scattering, it is not necessary to reduce the rotation speed of the grindstone in order to perform setup change, and the manufacturing time of parts can be shortened. ..

FIG. 1 is a plan view showing one embodiment of the grindstone cover device for an internal grinding machine according to the present invention. FIG. 2 is a perspective view of the grindstone cover device for an internal grinding machine according to the present invention as viewed from the front side. FIG. 2A is a state in which the movable cover is in the open position, and FIG. 2B is a state in which the movable cover is closed. It shows each state in the position. FIG. 3 is a perspective view seen from the rear side. FIG. 4 is a plan view showing a conventional grindstone cover device for an internal grinding machine. 5A and 5B are perspective views, in which FIG. 5A shows a state in which the grindstone cover is in the non-cover position, and FIG. 5B shows a state in which the grindstone cover is in the cover position.

Hereinafter, embodiments of the grindstone cover device for an internal grinding machine of the present invention will be described with reference to FIGS. 1 to 3. In the following description, the left side of FIG. 1 is referred to as the front, the right side is referred to as the rear, and the left and right are referred to as the left and right when the front is viewed from the rear.

As shown in FIG. 1, the inner grindstone (1) is provided at the headstock (2) that supports the spindle (3) extending in the front-rear direction and the tip of the spindle (3) to hold the work (W). A chuck (4) to be used, an inner grinding shaft (5) having a shaft extending in the front-rear direction and arranged to face the headstock (2), and an inner grinding shaft (5) rotatably supported. A grindstone (6) that grinds the inner surface of the work (W), an overall cover (7) that covers the headstock (2) and the inner surface grinding shaft (5), and an overall cover (7) for workers to enter and exit. It is equipped with a door (8) that opens and closes the opening (7a), and a grindstone cover device (9) for an internal grinding machine that can cover the grindstone (6).

The door (8) is closed while the inner surface grinding is being performed, and when the inner surface grinding is completed, the operator opens the door (8), enters the setup work space (S), and enters the work (W). Take out and install. The grindstone cover device (9) protects the operator performing the setup change in the setup work space (S) from the rotating grindstone (6).

The grindstone cover device (9) consists of a fixed cover (10) that separates the headstock (2) and the internal grinding shaft (5), and a movable cover (10) that is attached to the fixed cover (10) so that it can move up and down. It is equipped with an 11) and a moving device (12) that moves the movable cover (11) between the open position and the closed position.

The left and right ends of the fixed cover (10) are fixed to the entire cover (7), and the inner grinding shaft (5) can move forward and backward as shown in Fig. 2 under the center of the left and right sides. An opening (10a) is provided. The movable cover (11) is movable between an upper position for opening the opening (10a) shown in FIG. 2 (a) and a lower position for closing the opening (10a) shown in FIG. 2 (b). There is.

The movable cover (11) has a front wall (13), an upper wall (14), and left and right walls (15), and the left and right walls (15) are 90 ° outside the left and right walls (15). Bent left and right edges (15a) are provided. The left and right walls (15) are inserted into guide grooves (16) provided in the fixed cover (10) at the rear portion, and the left and right edge portions (15a) face each other with a gap from the rear side to the fixed cover (10). Has been done.

The moving device (12) includes left and right guide rails (17) fixed to the surface of the fixed cover (10) facing the left and right edges (15a) of the movable cover (11), and the movable cover (11). A pair of left and right guide blocks (18) fixed to the surface of the left and right edges (15a) facing the fixed cover (10) and fitted to the guide rail (17), and the right end of the fixed cover (10). It is equipped with a fluid pressure cylinder (19) that moves the bracket (20) attached to the right edge (15a) of the movable cover (11) and fixed to the lower end of the movable cover (11) up and down.

According to the fluid pressure cylinder (19), the lower end of the piston (19a) extending downward is fixed to the bracket (20) and can be moved via the bracket (20) by moving the piston (19a) upward. The cover (11) can be moved between an upper position (ie, an open position) and a lower position (ie, a closed position).

The fixed cover (10) and the movable cover (11) are made of a material having the same strength as the overall cover (7) (for example, a metal such as stainless steel). Therefore, when the movable cover (11) is in the closed position, the internal grinding shaft (5) is arranged by the strong cover (10) (11) in the setup work space (S) where the operator changes the setup. It is separated from the space where it is.

According to the grindstone cover device (9) for the internal grinding machine described above, as shown in FIG. 2A, when the movable cover (11) is in the open position, the opening (10a) provided in the fixed cover (10) is provided. By advancing the inner surface grinding shaft (5) to the position shown by the alternate long and short dash line in FIG. 1, the inner surface of the work (W) can be ground by the grindstone (6).

Then, at the end of grinding, the inner surface grinding shaft (5) is retracted to the position shown by the solid line in FIG. 1 by passing through the opening (10a) provided in the fixed cover (10), and the movable cover (11) is shown in FIG. Move to the closed position shown in 2 (b). As a result, the setup work space (S) and the grindstone (6) are separated by a fixed cover (10) and a movable cover (11). Therefore, even if the grindstone (6) rotating at high speed is damaged, it is possible to prevent the grindstone (6) from scattering, and it is not necessary to reduce the rotation speed of the grindstone (6) in order to change the setup. The production time of the whetstone can be shortened.

(1): Internal grinding machine
(2): Headstock
(3): Main shaft
(5): Internal grinding shaft
(6): Whetstone
(7): Overall cover
(9): Grindstone cover device for internal grinding machine
(10): Fixed cover
(10a): Aperture
(11): Movable cover
(12): Mobile device
(17): Guide rail
(18): Guide block
(19): Fluid pressure cylinder
(W): Work

Claims (2)

It is provided with a headstock that supports the spindle that holds the work, an inner surface grinding shaft that is arranged so as to face the headstock and rotates a grindstone that grinds the inner surface of the work, and an entire cover that covers the headstock and the inner surface grinding shaft. It is a grindstone cover device provided on the inner grinding machine that covers the grindstone, and enables the fixed cover that partitions the headstock and the inner grinding shaft and the inner grinding shaft provided on the fixed cover to advance and retreat. A grindstone cover device for an internal grinding machine, which comprises a movable cover that can open and close an opening and a moving device that moves the movable cover between an open position and a closed position. The grindstone cover device for an internal grinding machine according to claim 1, wherein the movable cover moves along a vertically extending guide rail fixed to the fixed cover and is moved up and down by a fluid pressure cylinder.

Images