JPS6150759A - Centerless grinding machine - Google Patents

Abstract

PURPOSE:To improve a degree of freedom in the setting direction of a grinding machine and its reliability of grinding accuracy, by regulating the space of a control wheel by rotary driving force of a motor mounted inside the grinding machine a utilizing a diameter measuring device of a workpiece so as to feedback control the motor. CONSTITUTION:Each machine element of a control wheel 2, its driving motor 103, dressing device 104, etc. is housed in a machine frame 101 forming the external contour of a centerless grinding machine 100. A threaded bar 107 is rotated by actuating a DC servomotor 111, correcting a space betwen a grinding wheel 1 and the control wheel 2. The grinding machine, comparing the measured value of a diameter of a pellet P after being ground by a measuring device 114 with a preset value, rotates the motor 111 in a direction separating the wheel 2 from or bringing it near the wheel 1 when the diameter of the pellet P is smaller or larger than the preset value. While the machine, measuring the diameter of the pellet P by the measuring device 114 while blowing nitrogen gas from a nozzle 117, automatically corrects the space between the both wheels 1, 2.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Application) The present invention relates to a centerless grinder for grinding an outer cylinder of a workpiece.

(Prior art) As shown in FIG. 3, a centerless grinding machine includes a grinding wheel 1, an Xgl leveling wheel 2 disposed opposite to the grinding wheel 1, and an angle of the adjusting wheel 2. Adjust the distance between the grinding wheel 1 and the grinding wheel 1! l! ! ! It is equipped with a grinding wheel correction device 3, and of the adjustment grinding wheel correction device 3, the distance correction means for correcting the distance from the grinding wheel 1 generally includes a manual feed device 4 and a fine movement feed device 5. There is.

By the way, in order to simplify one mechanism, especially in a downsized centerless grinding machine, the configuration of the feed device 4 is changed in the direction in which the grinding wheel 1 and the adjusting wheel 2 face each other, that is, in the direction in which the adjusting wheel 2 faces. A screw rod 6 was arranged along the moving direction, one end of the screw rod 6 protruded from the machine frame, and an operating handle 7 was attached to it.

For this reason, when the installation space is limited, specifically in a rich closed space (glove box) where the grinding of nuclear fuel sintered bodies is carried out, the presence of the operation handle 7 protruding from the machine frame, There were some restrictions on the installation of centerless grinding machines.

For example, in the nuclear fuel manufacturing process, the grinding process in which a sintered body (hereinafter referred to as a pellet) made of fuel materials such as uranium No. 325 is ground into a cylindrical shape and the inspection process, which is the next step, have a negative impact on the human body. In order to ensure airtightness and to facilitate maintenance of the equipment inside the glove box, the glove box is made to have a constant width (within 1 m). There is.

For this reason, when installing a centerless grinder in such a glove box, it is necessary to install the centerless grinder so that the feed direction of the grinder is aligned with the conveyance line of the pellets due to the presence of the operating handle that protrudes from the machine frame. It may not be possible. As shown in FIG. The related equipment is connected by a feeder, and the feeder applies vibration to the guide trough to move the pellet P, so the movement of the pellet P is obstructed by the bent part of the guide trough, and the grinding JR
This necessitates that the front and rear feeder devices have complicated mechanisms, and also causes a problem in that the next step, external dimension inspection, is delayed.

(Problems to be Solved by the Invention) The present invention has been made in view of the above-mentioned circumstances, and its technical problem is the grinding wheel and f of a grinding machine.
To provide a centerless grinding machine whose outer dimensions in the opposing direction of A-leveling grinding wheels are made as compact as possible, and which can improve the degree of freedom in the installation direction of two grinding machines even when installed in a limited space. It is in.

(Means for solving the problem) In order to achieve this technical problem, the present invention includes:
A motor is installed as a drive source for the interval correction means of the 81 grinding wheel, and a measuring device is used to measure the diameter of the workpiece, and the diameter value of the workpiece measured by the measuring device is compared with the set diameter value, When the diameter of the workpiece is small, the adjustment wheel is moved in the direction away from the grinding wheel, and when the diameter of the workpiece is large, the adjustment wheel is moved in the direction toward the grinding wheel. The configuration is such that a comparison control means is provided to output power to the motor.

(Operation/Effect) According to the present invention, since the yJ leveling stone wheel interval is corrected by the rotational driving force of the motor installed in the grinding machine, it is possible to The external dimensions can be made compact, and therefore, even when installed in a limited space, the degree of freedom in the installation direction of the grinder can be improved.

In addition, the control of the motor as the drive source of the interval correction means,
By controlling the diameter of the workpiece using a measuring device, the grinding accuracy of the workpiece can be made reliable, and the grinding machine can be automated, making it unmanned. Driving becomes possible.

(Example) Hereinafter, an example of the present invention will be described based on the drawings, and the same reference numerals will be given to the same components as those of the conventional grinding machine described above, and the description thereof will be omitted as appropriate.

1 and 2 show a center L/S grinder a100 according to the present invention which is applied to grinding pellets P. This centerless grinder 100 has a glove box because the pellet P is a radioactive material. It is installed within the
The centerless grinding machine 100 is supplied with pellets P formed in the sintering process, which is the previous process, by a feeder 12 consisting of a vibration guide trough, and the pellets P after grinding are sent to the external dimension inspection process, which is the subsequent process, by vibration. It is sent out through the guide trough 13.

The centerless grinding machine +00 has an outer shell formed by a machine frame lO1, and each element is housed in the machine frame lot.
The machine frame 101 is provided with a bed +02, and an adjusting grinding wheel 2, a motor 103 for driving the adjusting grinding wheel 2, and a dressing device +04 are attached to the bed 102. The bend 102 has a two-part structure, and the angle of the adjusting grinding wheel 2 is adjusted by loosening the horizontal angle correction bolt 105 and the feed angle correction bolt (not shown). 108 in the figure is a feed angle correction fulcrum. The bed 102 having such a configuration as shown in FIG.
ot, the grinding wheel 1 and the adjusting wheel 2 are allowed to slide in opposite directions, and the sliding of the bed '+02 causes the adjusting wheel 2 to move away from and approach the grinding wheel 1. It is being done.

- On the other hand, screws #1 are arranged along the sliding direction of the bed 102 on the machine frame 101 and are rotatably supported by the machine frame 101. , 107 are provided, and a gear 10 is fixed to the threaded rod +07, and an actuator 108 is screwed to its nephew.

゛ The actuator +09 engages with the driven WA 110 fixed to the aforementioned bed 102, and the distance between the grinding wheel 1 and the adjustment grinding wheel 2 is corrected by the bed 102 that follows the movement of the actuator 109. That drive! D as II source
A C servo motor Ill is disposed within the machine frame 101, and a gear 108 fixed to the screw rod 107 and a DC servo motor Ill are disposed in series with the grinding machine 100 in order to measure the diameter of the pitch P. The diameter of the pellet P measured by the measuring device 114 is compared with the set value, and when the diameter of the pellet P is small, the adjusting grinding wheel 2 is separated from the grinding wheel 1. direction, peret)
This is done by a comparison control means (not shown) which issues a signal to the motor 112 to rotate the motor 112 in a direction that brings the adjustment grinding wheel 2 closer to the grinding wheel 1 when the value of the diameter of P is larger than the set value. Here, the measuring device 114 is a laser beam measuring device that scans the pellet P with a laser beam and measures the diameter from the length of time during which the laser beam is shaded by the pellet P. In Figure 0, 115 is an oil tank for axle lubrication, and the oil tank +15 is conventionally attached to the machine frame 1.
This example 100 is attached to the outside of 01.
In this case, consideration has been given to making the external dimensions of the grinding machine 100 more compact by storing it in the machine frame 101.

The centerless grinding machine 100 configured in this manner has no members protruding from the machine frame 101, and the outer dimensions of both paper stone wheels 1.2 in the opposing directions are compact. There is no restriction on the arrangement within the centerless grinding [100 pellets P].
The glove box 11 can be placed along the longitudinal direction of the glove box 11. From this, it is now possible to connect the pellet P conveyance line with a straight line as shown in Figure 5, and the pellet P conveyance line can be connected with a straight line as shown in Figure 5.
The movement of P can be made smooth, it is possible to prevent a delay in measurement with the measuring device +14 that can be arranged in series, and the mechanism of the feeder equipment after the grinder n+1 can be simplified. .

Also, while blowing nitrogen gas from the nozzle 117, the diameter of the ground beret P is immediately measured with the measuring device 114, and the distance between the two paper stones 1.2 is automatically corrected by Fitoback control. From, glove box 11
This will enable unmanned operation inside the vehicle.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 show an embodiment according to the present invention,
FIG. 1 is a partially sectional view, and FIG. 2 is a partially side view. FIG. 3 is a partial sectional view of a conventional centerless grinder, and FIG. 4 is a diagram showing the arrangement of the grinder in a glove box. FIG. 5 is a layout diagram of the grinding machine according to this embodiment inside the glove box. +00... Centerless grinding machine of the embodiment 1... Grinding wheel, 2... Adjusting grinding wheel 3... Adjusting grinding wheel correction device Ill... DC servo motor) 14... Measuring instrument

Claims (1)

[Claims] (1) A measuring device that is equipped with a motor as a drive source for the interval correction means of the adjustment grinding wheel and that measures the diameter of the workpiece;
Compare the diameter value of the workpiece measured with the measuring device and the set diameter value, and if the diameter of the workpiece is small, move the adjustment grinding wheel in the direction away from the grinding wheel, and check that the diameter of the workpiece is small. A centerless grinding machine characterized in that it is provided with a comparison control means for issuing a signal to the motor to move the adjusting grinding wheel in a direction closer to the grinding wheel when the adjustment grinding wheel is larger than the grinding wheel.