JPH08112756A - Wear correcting mechanism in polishing machine - Google Patents

Abstract

PURPOSE: To perform polishing work under a fixed polishing pressure by providing a correcting mechanism of increasing a degree of pressure contact of a rotary polisher with a workpiece, in the case of decreasing a measured value in a measuring part to a measuring lower limit value or less in a condition that the workpiece is set. CONSTITUTION: In a condition that setting a workpiece 1 is judged by a detecting part 3 with the workpiece 1 in polishing work, in the case that a rotary polisher 2 is worn with a measured value in a measuring part 5 in a measuring lower limit value or less, a moving control mechanism 6 is actuated to move the rotary polisher 2 to relatively approach relating to the workpiece 1, and a degree of pressure contact of the rotary polisher 2 against the workpiece 1 is increased to control a wearing amount corrected. For instance, reversely in the case of increasing the measured value of the measuring part 5 to a measuring upper limit value or more, the moving control mechanism 6 is actuated to move the rotary polisher 2 to relatively separate relating to the workpiece 1, so as to reduce the degree of pressure contact of the rotary polisher 2 against the workpiece 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention corrects and adjusts the pressure contact degree of a rotary abrasive body with respect to a work by moving a rotary abrasive body to be pressed against the work relative to the work according to wear of the rotary abrasive body. However, the present invention relates to a wear correction mechanism in a polishing machine configured to always polish a work at a predetermined polishing pressure.

[0002]

2. Description of the Related Art There is a conventional wear compensating mechanism in a polishing machine that manually moves and corrects a rotary abrasive body. However, in automatic control, the wear of the rotary abrasive body is generally considered. Based on the data, the number of polishing times and the extent to which the rotary polishing body is moved are set in advance and correction control is performed.

However, in such a conventional automatic control method, if there is a difference between the preset data and the actual wear situation, it causes an error.

Further, since the correction control is performed after polishing several times, the correction control is not performed for each workpiece that is continuously introduced, and continuous and highly accurate automatic correction control cannot be achieved.

In view of the above problems, the present invention has a simple structure in which sequential correction control is performed for each workpiece.
It is an object of the present invention to provide a wear compensation mechanism for an extremely excellent automatic control type polishing machine that can perform polishing processing with high accuracy and at a constant polishing pressure.

[0006]

The gist of the present invention will be described with reference to the accompanying drawings.

The rotary polishing body 2 which is pressed against the work 1 is
The rotary abrasive body 2 is moved relative to the work 1 in accordance with the wear of the rotary abrasive body 2 so as to correct and adjust the pressure contact degree of the rotary abrasive body 2 with respect to the work 1 so that the work 1 can always be polished at a predetermined polishing pressure. In the wear compensating mechanism in the constructed polishing machine, a detection unit 3 for detecting whether or not the work 1 is set at the polishing position where the rotary polishing body 2 is pressed is provided, and a drive motor for driving the rotary polishing body 2 4 is provided with a measuring unit 5 for measuring the load current or the load voltage corresponding to the load current, and the measuring unit 5 has a lower polishing resistance and a lower measurement limit value a determined to be polishing at a desired polishing pressure or less.
And the upper limit of measurement b, which is determined to have a large polishing resistance and is considered to be polished at a desired polishing pressure or more, and the degree of pressure contact between the rotary polishing body 2 and the work 1 is controlled to be relatively moved to perform correction adjustment. A control mechanism 6 is provided, and at least the work 3 is determined by the detection unit 3 to be set,
Further, when the measurement value of the measuring unit 5 is less than or equal to the measurement lower limit value a, the movement control mechanism 6 is activated to increase the pressure contact degree between the rotary abrasive body 2 and the work 1. The present invention relates to a wear correction mechanism in a polishing machine, which is configured as a correction mechanism having a meter relay structure.

Further, the detection unit 3 for detecting whether or not the work 1 is set is measured by measuring the load current of the drive motor 4 for driving the rotary abrasive body 2 or the load voltage corresponding to this load current. The measuring unit 7 is provided with the unit 7.
Is set to a measurement lower limit value c that is determined that the work piece 1 is not set because the grinding resistance is small or zero and is below a predetermined grinding pressure, and the measurement value of the measuring unit 7 is below the measurement lower limit value c. 2. If there is, the work 1 is not set, and the movement control mechanism 6 is configured not to operate so as to have a double relay structure, and the wear correction mechanism in the sanding machine according to claim 1. It is related to.

[0009]

When the detection unit 3 determines that the work 1 is not set, the movement control mechanism 6 is not operated.

When the work 1 is judged to have been set by the detection unit 3 and the work 1 is being ground, the measurement value of the load current of the drive motor 4 or the voltage corresponding to the load current is measured by the measurement unit 5. If it is between the lower limit value a and the measurement upper limit value b, the movement control mechanism 6 does not operate because the work 1 is polished by the rotary polishing body 2 with an appropriate degree of pressure contact.

When the rotary abrasive body 2 is worn and the measured value of the measuring section 5 is less than or equal to the measurement lower limit value a, the movement control mechanism 6
Is activated, the rotary abrasive body 2 moves relatively closer to the work 1, the pressure contact degree of the rotary abrasive body 2 with respect to the work 1 is increased, and the wear amount is corrected and controlled.

On the contrary, for example, when the measured value of the measuring section 5 becomes equal to or more than the upper limit value b of measurement, the movement control mechanism 6 is actuated and the rotary abrasive body 2 moves relatively away from the work 1. Then, the degree of pressure contact of the rotary polishing body 2 with respect to the work 1 is reduced.

Therefore, the pressure contact degree (polishing pressure) is always automatically corrected and adjusted by the correction mechanism of the meter relay structure for each work 1 to be sequentially polished, and the load of the drive motor 4 is always lower than the measurement lower limit value a and the measurement upper limit. It will be maintained in a proper state between the value b.

[0014]

EXAMPLE In the present example, the present invention is applied to a polishing machine for sequentially supplying a shaft as a work 1 and pressing and polishing a buff or a grindstone, which is a rotary polishing body 2, for example. Is configured to transmit the rotational drive force of the drive motor 4 via a rotation transmission mechanism such as a pulley 8 and a transmission belt 9 to rotate the drive motor 4.

The unit including the drive motor 4 and the rotation transmission mechanism is moved by rotating the screw rod 14 to move the rotary abrasive body 2 to and from the work 1.

In this embodiment, the screw rod 14 is a ball screw, which is indexed and rotated by a control motor (stepping motor) 10 so that the rotary abrasive body 2 can be precisely moved and controlled on the order of 1/100 mm. There is.

1 and 2 show a first embodiment.

In this embodiment, the measuring section 5 is an analog type meter for measuring the load current of the drive motor 4.

This analog type measuring unit 5 is provided with a lower limit value hand 11 for determining the measuring lower limit value a and an upper limit value hand 12 for determining the measuring upper limit value b, and the knob of the measuring unit 5 is turned to set the lower limit value. needle
11, moving the upper limit hand 12 to measure lower limit value a, upper limit value b
To decide.

When the measuring needle 13 indicating the load current is located between the lower limit needle 11 and the upper limit needle 12, it means that the load is appropriate, that is, the polishing is performed at an appropriate polishing pressure.

When the rotary abrasive body 2 is worn and the measuring needle 13 is below the lower limit needle 11, for example, a relay signal (pulse signal) is output from the measuring unit 5 to the control motor (stepping motor) 10. The control motor (stepping motor) 10 is rotated by a predetermined rotation amount based on the condition set in advance by the pulse signal, and the ball screw 14 is rotated (the movement control mechanism 6 is operated). The rotary abrasive body 2 is moved closer to the work 1 on the order, and the polishing pressure is corrected and adjusted.

Therefore, the workpieces 1 supplied one after another are checked for polishing pressure (pressure contact degree) by the correction mechanism of the meter relay structure every time polishing is performed, and when the polishing pressure is insufficient due to abrasion, the workpieces 1 are corrected and adjusted. .

If the measuring needle 13 exceeds the upper limit needle 12, it is determined that the degree of pressure contact is higher than an appropriate value, and conversely a relay signal for rotating the control motor (stepping motor) 10 in reverse is output. Then, the movement control mechanism 6 causes the rotary abrasive body 2 to move apart.

Therefore, in this embodiment, even if the rotary polishing body 2 is worn or the shape and type of the work 1 is changed, the polishing can be always performed with a constant polishing pressure.

Since the measurement lower limit value a and the measurement upper limit value b can be easily adjusted and set, the work 1 can be changed.

Further, in the present embodiment, a detection unit 3 for detecting whether or not the work 1 is set at the polishing position where the rotary polishing body 2 is pressed is provided, and the work 1 is not set by the detection unit 3. In this case, the measuring unit 5 does not output a relay signal by mistake, or ignores it even if it does. This is, for example, simply detecting whether or not the workpiece 1 is disposed in contact with the rotary abrasive body 2. You may provide the sensor to do.

FIG. 3 shows a second embodiment.

In this embodiment, the detection unit 3 is provided with a measuring unit 7 for measuring the load current of the drive motor 4 for driving the rotary abrasive body 2 or the load voltage corresponding to this load current. The measurement lower limit value c is set so that it is judged that the work 1 is not set because the polishing resistance is small or zero and is equal to or less than the predetermined polishing pressure, and the measurement value of the measuring unit 7 is equal to or less than the measurement lower limit value c. If the work 1 is not set, the movement control mechanism 6
It is configured so that it will not operate and has a double relay structure.

In the second embodiment, the measuring unit 7 is an analog system for measuring the load current of the drive motor 4 like the measuring unit 5 and the measuring unit 5 is a digital system.

This analog type measuring unit 7 has a lower limit value hand.
When the measuring lower limit value c is set by 15 and the measuring needle 16 is lower than the lower limit value hand 15, it is determined that the work 1 is not set because there is no resistance of the drive motor 4, and even if the measuring unit 5 Even if a relay signal is output, the relay signal is blocked or the control motor (stepping motor) 10 (movement control mechanism 6) is not operated.

A measurement upper limit value d is also set in the measuring unit 7 by an upper limit value needle 17, and the measurement upper limit value d, that is, the measurement needle
If 16 exceeds the upper limit needle 17, it is determined that there is an abnormality, and the drive motor 4 is controlled to stop.

Further, the digital measuring unit 5 is configured to digitally set the measurement lower limit value a and the measurement upper limit value b and digitally display the measurement value.

[0033]

Since the present invention is constructed as described above, it is possible to perform a correction control for each work piece in a simple structure, and to perform an extremely excellent automatic grinding process with high accuracy and at a constant grinding pressure. It becomes the wear compensation mechanism in the control type polishing machine.

[Brief description of drawings]

FIG. 1 is a schematic configuration explanatory diagram of a first embodiment.

FIG. 2 is a schematic configuration front view of the first embodiment.

FIG. 3 is a schematic configuration explanatory diagram of a second embodiment.

[Explanation of symbols]

 1 Work 2 Rotary Abrasive Body 3 Detecting Section 4 Drive Motor 5 Measuring Section 6 Movement Control Mechanism 7 Measuring Section a Measurement Lower Limit b Measurement Upper Limit c Measurement Lower Limit

Claims (2)

[Claims] 1. A rotary abrasive body that is pressed against a workpiece is moved relative to the workpiece according to wear of the rotary abrasive body, and the degree of press contact of the rotary abrasive body with respect to the workpiece is corrected and adjusted so that the workpiece is always at a predetermined level. In a wear correction mechanism of a polishing machine configured to be capable of polishing with a polishing pressure of 1, the detection unit for detecting whether or not a work is set at a polishing position where the rotary polishing body is in pressure contact, and the rotary polishing body A lower limit of the measurement value that the load current of the drive motor that drives the motor or the load voltage corresponding to this load current is provided, and that the grinding resistance is small and it is judged that the grinding is performed at the desired grinding pressure or less. Then, the upper limit of measurement is set, which is judged to be high in polishing resistance and is polished at a desired polishing pressure or higher, and the relative adjustment of the pressure contact degree between the rotary abrasive body and the workpiece is performed for correction adjustment. If a movement control mechanism is provided and it is determined that at least the work is set by the detection unit, and the measurement value of the measurement unit is less than or equal to the measurement lower limit value, the movement control mechanism operates. A wear correction mechanism for a polishing machine, characterized in that it is configured as a correction mechanism of a meter relay structure by increasing the pressure contact degree between a rotary abrasive body and a workpiece. 2. A detection unit for detecting whether or not the work is set, and a measurement unit for measuring a load current of a drive motor for driving the rotary abrasive body or a load voltage corresponding to the load current. This measurement unit is configured to have a lower measurement limit value that indicates that the work piece is not set because the grinding resistance is small or zero and is below the predetermined grinding pressure.The measurement value of this measurement unit is below the lower measurement limit value. 2. The wear correction mechanism in the sanding machine according to claim 1, wherein the movement control mechanism is configured not to operate when the workpiece is not set, and has a double relay structure.