JP2003266295A - Buff machining controller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stabilize polishing quality and improve production efficiency by automatically controlling a polishing condition by a buff wheel 12. <P>SOLUTION: A buff machining controller is provided with a buff drive motor 13 for rotating the buff wheel 12, a buff pressing motor 14 for giving pressing force against a workpiece W to the buff wheel 12 through a ball screw 16, a current sensor 1 for detecting load of the buff wheel 12 as a load current value, a position sensor 2 for detecting a wear amount of the buff wheel 12 as a travel amount of the buff wheel 12, and a controller 4 for controlling the drive of the buff pressing motor 14 and the buff drive motor 13 from a detected value and a reference value of the current sensor 1 and the position sensor 2. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a buffing control device which can automatically control a polishing state by a buff in a buffing device used for mirror-finishing metal parts or the like.

[0002]

2. Description of the Related Art The exposed metal portion of a vehicle dynamic damper or the like is mirror-finished by a buffing machine. The buffing device performs polishing by pressing a buffing wheel made of a laminate of cloth holding an abrasive or a felt or the like against a work surface of a workpiece while rotating the motor.

In such a buffing process, when the load for pressing the outer peripheral surface of the buffing wheel against the work and the polishing rate are excessively large, the amount of wear of the buffing vehicle becomes unnecessarily large, and conversely it is too small. In this case, a high-quality mirror finish cannot be obtained. For this reason, the pressing load and the polishing speed (rotation speed) of the buff wheel must always be adjusted appropriately, but in the past, the adjustment was made while the operator heard the grinding sound and observed the surface condition of the work. The current situation is to rely on intuition. Further, as the outer peripheral surface of the buff wheel wears, the peripheral speed of the polishing surface decreases, so it is also necessary to adjust the rotation speed of the buff wheel. I was going.

However, such adjustment depending on the operator's intuition results in poor production efficiency and a large cost burden, and requires a high degree of skill of the operator. Moreover, it is difficult to secure stable quality because the finishing quality varies depending on the skill level.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and its technical problem is to improve the polishing state by a buffing wheel without depending on the high skill of an operator. The automatic control aims to stabilize the polishing quality and improve the production efficiency.

[0006]

The conventional technical problems can be effectively solved by the present invention. That is, a buffing control device according to the invention of claim 1 is a buff drive motor for rotating a buffing wheel, a buffing push motor for giving a pushing force to a work on the buffing wheel, and a load detection for detecting a load of the buffing wheel. And a controller for controlling the drive of the buff pressing motor based on the detected value from the load detecting means. Therefore,
The buff pressing motor is controlled by the controller so that the polishing load due to the pressing load of the buff wheel on the work always has an optimum value.

According to a second aspect of the present invention, in the buffing control device according to the first aspect, the load detecting means is a current sensor for detecting the load current value of the buff drive motor. The load torque that acts on the buff wheel during polishing with the buff wheel is proportional to the pressing load of the buff wheel against the work, and the load current (spindle drive current) of the buff drive motor is proportional to the load torque, so it is detected by the current sensor. Based on the applied load current value, the pressing load of the buff wheel on the work by the pressing motor can be appropriately controlled.

A buffing control device according to a third aspect of the present invention is the buffing control device according to the first aspect, further comprising a wear detecting means for detecting the amount of wear of the buffing vehicle, and the controller detects the wear amount from the wear detecting means. The rotation speed of the buff drive motor is controlled so as to compensate for the decrease in the peripheral speed due to the decrease in the outer diameter of the buff vehicle based on the detected value of. The outer diameter of the buff wheel decreases with time due to wear, but the number of revolutions of the buff wheel is constantly corrected based on the value detected by the wear detection means, so the polishing speed of the outer peripheral polishing surface of the buff wheel is adjusted. Can be kept constant.

According to a fourth aspect of the present invention, in the buffing control device according to the third aspect, the wear detecting means comprises a position sensor for detecting the amount of movement of the buffing wheel by the buffing motor. . In other words, the buffing car that is pressed by the buffing motor so that the pressing load on the work is always the optimum value,
Since the workpiece moves to the work side following the wear, the wear amount can be detected from the movement amount.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic configuration explanatory view showing a preferred embodiment of a buffing control device according to the present invention. In FIG. 1, reference numeral W is a work made of an annular metal part such as a vehicle dynamic damper,
The work table 11 of the apparatus is sequentially transported and set.

Reference numeral 12 is a buff wheel, which is a cloth or felt or the like holding an abrasive, and is formed in a circular shape centering on a rotation axis whose axis is substantially parallel (horizontal) to the surface to be processed of the work W. The buff drive motor 13 is driven to rotate around the axis.

Reference numeral 14 is a buff pressing motor which is located above the buff wheel 12 and is fixedly installed on the frame 15 of the apparatus. The lower end of the vertical output shaft 14a in the buff pressing motor 14 has a vertical ball screw 16
Is bound to.

A pressing plate 17 is screwed onto the ball screw 16. On the other hand, the bearing (not shown) for rotatably supporting the rotating shaft of the buff wheel 12 and the buff drive motor 13 are provided on the movable support base 1.
8, the pressing plate 17 and the movable support 18 are connected via a spring 19. That is, when the ball screw 16 is rotated forward and backward around its axis by the buff pressing motor 14, the pushing plate 17 is moved up and down by the propulsive force of the ball screw 16, and the movement is transferred to the movable support 18 via the spring 19. When transmitted, the buff wheel 12 moves up and down together with the buff drive motor 13. In addition, the buff wheel 12 is the work W on the work table 1.
In the state of contacting the surface to be processed, the compression amount of the spring 19 changes as the pressing plate 17 moves up and down, so that the pressing load of the buff wheel 12 against the surface to be processed of the work W changes.

Reference numeral 1 is a current sensor for detecting the spindle drive current i of the buff drive motor 13. When the outer peripheral surface of the buffing wheel 12 is pressed against the surface of the workpiece W on the workbench 1 and is rotated to perform polishing, the torque due to the polishing load acting on the buffing wheel 12 is applied to the surface of the workpiece W to be processed. It is proportional to the pressing load of the buff wheel 12, and the spindle drive current i of the buff drive motor 13 is also proportional to the torque due to this polishing load. Therefore, the spindle drive current value detected by the current sensor 1 is the buff pressing motor 1
4, the polishing load torque changes in proportion to the amount of movement of the pressing plate 17 (compression amount of the spring 19) due to the drive of No. 4 and the polishing load torque due to the pressing load of the buff wheel 12 against the work W.

Reference numeral 2 is a position sensor installed on the movable support 18. This position sensor 2 is a movable support 1.
The moving amount of 8 is detected. Since the amount of movement corresponds to the amount of wear of the outer peripheral polishing surface 12a of the buff wheel 12, the position sensor 2 functions as wear detecting means for the buff wheel 12. As the position sensor 2, for example, a potentiometer, a non-contact type distance sensor that detects the distance between the movable support 18 and the frame 11, or a rotary encoder attached to the buff pressing motor 14 can be used.

A rotation speed sensor 3 such as a rotary encoder is provided on the rotary shaft of the buff wheel 12 or the main shaft of the buff drive motor 13. That is, the rotation speed of the buff wheel 12 is always detected by the rotation speed sensor 3.

Reference numeral 4 is a controller. The controller 4 includes a CPU (central processing unit) 41,
A ROM (Read Only Memory) 42 that stores a control program, a RAM (Random Access Memory) 43 that temporarily stores the detection data from the current sensor 1 and the position sensor 2 and other processing data, a work, etc. And an input unit 44 for inputting various data and the like. The CPU 41 determines from the spindle drive current detection value detected by the current sensor 1 and the preset reference current value,
The control data is calculated based on the deviation data and output to the drive circuit 5 of the buff pressing motor 14,
Further, the peripheral speed of the outer peripheral polishing surface 12a of the buff wheel 12 obtained from the buff wear detection data detected by the position sensor 2 and the rotation speed data of the buff wheel 12 detected by the rotation speed sensor 3, and a preset reference value. From the peripheral speed data, the deviation is 0
The rotation speed control data that satisfies the above condition is calculated and output to the drive circuit 6 of the buff drive motor 13.

Incidentally, the reference current data and the reference peripheral velocity data are set to proper values obtained in advance by experiments or the like, and are stored in the RAM 43 of the controller 4.

The buffing control device having the above structure is
When the work W is conveyed to a predetermined position on the work table 11, the outer peripheral polishing surface 12a of the buffing wheel 12 is pressed against the upper surface (working surface) of the work W, which is rotated by the drive of the buff drive motor 13 to perform polishing. Be seen. At this time, spring 1
When the pressing load on the work W given to the buff wheel 12 via the movable support 18 is too small by 9,
The load torque acting on the buff wheel 12 due to the polishing is also small, and therefore the current value of the spindle drive current i of the buff drive motor 13 detected by the current sensor 1 becomes lower than the preset reference current value. . Therefore, the CPU 41 of the controller 4 outputs the control data based on the deviation to the drive circuit 5 of the buff pressing motor 14, whereby the buff pressing motor 14 is activated by the current sensor 1.
Until the deviation between the detected current value and the reference current value by 0 becomes 0, the pressing plate 17 is rotated in the downward direction so as to increase the compression amount of the spring 19 so as to increase the pressing load of the buff wheel 12 against the work W. Let

On the other hand, when the pressing load against the work W is excessive, the load torque acting on the buff wheel 12 is also excessive due to the polishing, so that the buff drive motor detected by the current sensor 1 is also increased. The detected value of the spindle drive current i of 13 is higher than the reference current value. Therefore, the CPU 41 of the controller 4 outputs the control data based on the deviation to the drive circuit 5 of the buff pressing motor 14, thereby causing the buff pressing motor 14 to detect the current detection value by the current sensor 1 and the reference current value. In order to reduce the pressing load of the buffing wheel 12 against the work W, the pressing plate 17 is rotated in the pulling-up direction until the deviation of is decreased to 0.

Therefore, by controlling the buff pressing motor 14 as described above, the buff wheel 12 always polishes the work W with an optimum pressing load. Therefore, unlike the case where the operator hears the grinding sound or observes the surface state of the work and adjusts the pressing load by relying on the intuition, the buff wheel 12 wears off unnecessarily,
Since the quality of polishing does not vary and the operator does not have to adjust the pressing load,
Work efficiency can be improved.

The outer peripheral polishing surface 12a of the buffing wheel 12 is worn away over time due to the polishing process. Since the buff wheel 12 is pressed against the work W so that the pressing load from the spring 19 is constant as described above, the axial center position of the buff wheel 12 is changed as the outer peripheral polishing surface 12a is worn. It will be displaced downward.

By the way, the outer peripheral polishing surface 12a of the buffing wheel 12
As the outer diameter of the buffing wheel 12 decreases with time, the peripheral speed of the outer peripheral polishing surface 12a, that is, the polishing speed, when the rotation speed of the buffing wheel 12 by the buffing drive motor 13 is constant. Will be reduced. However, according to this embodiment, the displacement of the buff wheel 12 due to wear of the outer peripheral polishing surface 12a is always detected by the position sensor 2, while the rotation speed of the buff wheel 12 is constantly detected by the rotation speed sensor 3. It has been detected. And the position sensor 2
When the peripheral speed of the outer peripheral polishing surface 12a of the buffing wheel 12 determined by the detection data from the rotation speed sensor 3 becomes lower than the preset reference peripheral speed data, the controller 4
Shows the control data based on the deviation of the buff drive motor 1
3 to the drive circuit 6, and the buff drive motor 13 detects the deviation between the peripheral speed value obtained from the detection data from the position sensor 2 and the rotational speed data from the rotational speed sensor 3 and the reference peripheral speed value. Buff drive motor 13 until 0
Of the buff wheel 12 is compensated for by reducing the outer peripheral speed of the buff wheel 12.

Therefore, the outer peripheral polishing surface 12 of the buff wheel 12
Regardless of the wear of a, the buffing wheel 12 always polishes the work W at the optimum polishing speed by controlling the buffing drive motor 13 as described above. Therefore, the quality of polishing does not vary and the operator does not need to adjust the rotation speed of the buff drive motor 13, so that the work efficiency can be improved.

[0025]

According to the buffing control device of the first aspect of the present invention, the buff pressing motor that applies a pressing force to the work on the buffing wheel detects the detection data from the load detecting means for detecting the load of the buffing wheel. Since it is controlled by the controller on the basis of the above, it is possible to always carry out the mirror-polishing finish of the work with the optimum pressing load without depending on the intuition of the operator. For this reason, it is possible to ensure stable product quality without the wear of the buff car unnecessarily advancing.

According to the buffing control device of the second aspect of the present invention, the load detecting means for detecting the load of the buffing vehicle comprises a current sensor for detecting the load current value of the buff drive motor. Since highly accurate detection data can be obtained, it is possible to control the load applied to the work of the buffing vehicle by the buffing motor with high accuracy.

According to the buffing control device of the third aspect of the present invention, the rotation speed of the buff drive motor is controlled based on the detection value from the wear detecting means for detecting the wear amount of the buff wheel. Even if the outer diameter of the car is reduced due to wear on the outer polishing surface of the car, the rotation speed of the buffing wheel is corrected so that the peripheral speed of the outer polishing surface is always constant. Can be polished. Therefore, the polishing quality does not vary due to the abrasion of the outer peripheral polishing surface of the buffing wheel, and the working efficiency can be improved.

According to the buffing control device of the fourth aspect of the present invention, the wear detecting means for detecting the wear amount of the buffing vehicle comprises a position sensor for detecting the moving amount of the buffing vehicle by the buff pressing motor. Since the amount of wear is detected as the amount of movement of the buffed vehicle, highly reliable detection data can be obtained, and therefore the rotation speed of the buffed vehicle by the buff drive motor can be controlled with high accuracy.

[Brief description of drawings]

FIG. 1 is a schematic configuration explanatory view showing a preferred embodiment of a buffing control device according to the present invention.

[Explanation of symbols]

1 Current sensor (load detection means) 2 Position sensor (wear detection means) 3 speed sensor 4 controller 11 Workbench 12 buff cars 13 buff drive motor 14 Buff pressing motor 15 Support 16 ball screws 17 Press plate 18 Movable support 19 spring

Claims (4)

[Claims] 1. A buff drive motor (13) for rotating a buff wheel (12), and a buff pressing motor (14) for applying a force for pressing the work (W) to the buff wheel (12),
A load detection means (1) for detecting the load of the buff wheel (12), and a controller (4) for controlling the drive of the buff pressing motor (14) based on the detection value from the load detection means (1). A buffing control device comprising: 2. The buffing control device according to claim 1, wherein the load detecting means (1) is composed of a current sensor for detecting a drive current value of the buff drive motor (13). 3. A controller (4) comprising wear detecting means (2) for detecting the amount of wear of the buffing wheel (12).
However, based on the detection value from the wear detecting means (2),
The buffing control device according to claim 1, wherein the rotation speed of the buff drive motor (13) is controlled so as to compensate for a decrease in peripheral speed due to a decrease in the outer diameter of the buffing wheel (12). 4. The buffing control device according to claim 3, wherein the wear detecting means (2) comprises a position sensor for detecting the amount of movement of the buffing wheel (12) by the buffing motor (14). .