JPH0521709B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to an electrolytic buffing compound polishing device that combines the elution action of an anode through electrolysis and the buffing action to finish the surface of metal into a mirror finish. The present invention relates to an electrolytic buffing compound polishing device that can automatically adjust the pressing force of a polishing head against a surface to be polished.

(Prior art) This type of electrolytic buffing composite polishing device removes only the film on the convex parts of the passivating oxide film on the minute irregularities produced on the surface of the object to be polished connected to the anode by electrolytic polishing. By mixing it with a buff or an electrolytic solution and mechanically removing it by abrasive grain abrasion, the electrolytic concentration is concentrated on the convex portions of the surface to be polished, greatly increasing the electrolytic polishing speed. As a prior art of such a polishing device, which performs mirror finishing, for example, the one described in Japanese Patent Publication No. 49120/1983 is known.

That is, in this prior art, a movable cylinder is fitted into a fixed cylinder so that it can move in and out only in the axial direction, a polishing head is attached to the front end of this movable cylinder, and the movable cylinder is connected to the fixed cylinder. A cylinder is interposed between them so that they can move in and out in the axial direction, and when the cylinder is driven, the movable cylinder moves in the direction of the surface to be polished, and a rotating polishing head is applied to the surface to be polished. The pressing force of the polishing head is adjusted by adjusting the pressure of the pressurized fluid supplied to the cylinder.

(Problem to be Solved by the Invention) However, in the above-mentioned prior art, the pressing force of the polishing head is set to a predetermined value simply by adjusting the pressure of the pressure fluid that operates the cylinder, so the pressing force is It is not possible to make fine pressure adjustments to bring the polishing head closer to the desired pressure, and the only way to calculate the pressing force of the polishing head is from the pressure value of the pressure fluid, making it impossible to accurately detect the pressing force. Therefore, it is difficult to adjust and maintain the abrasive removal effect of the abrasive material attached to the electrode plate of the polishing head on the surface to be polished to the optimum pressing force, and it is difficult to achieve a mirror finish with the desired surface roughness. Can not.

Furthermore, because the cylinder has operating inertia and seal resistance, there is a problem in that the polishing head does not respond smoothly to the undulations and irregularities of the surface to be polished.

(Means for Solving the Problems) The present invention has been made in order to solve the problems of the conventional art. The housing is guided so as to be raised and lowered by the actuator, and the housing is suspended from the base via the actuator. A cylindrical drive shaft is rotatably supported within the housing with its axis facing the operating direction of the actuator. The drive shaft is rotated by a drive motor disposed in the housing, and a rotary shaft is provided inside the cylindrical drive shaft, which rotates integrally with the drive shaft and is movable up and down, and has an electrolyte supply hole inside. The upper and lower ends of the rotating shaft are inserted into the housing, and the upper and lower ends of the rotating shaft are respectively projected from the upper end of the cylindrical drive shaft and the lower end surface of the housing;
A polishing head that performs electrolytic buffing and compound polishing is attached to the lower end of the protrusion, and a rotary joint that supplies electrolyte is attached to the upper end of the protrusion.Furthermore, a bearing seat with a load cell installed in the middle of the rotating shaft is installed. A cup-shaped receiver is attached to the housing so that the distance between the receiver and the receiver can be adjusted by moving it against the receiver, and an elastic body made of a coil spring is interposed between the receiver and the cup-shaped receiver. The pressing force of the polishing head is adjusted to a predetermined pressure by adjusting the distance between the receiving seat and the cup-shaped receiver in response to this detection signal. The invention is characterized in that it is configured to do so.

(Function) According to the above configuration, when performing electrolytic buff composite polishing by pressing the polishing head against the surface of the object to be polished while rotating, the sum of the weight of the polishing head and rotating shaft and the elastic force of the elastic body is This is the pressing force of the head to be polished against the surface. Therefore, by appropriately adjusting the elastic force of the elastic body, the pressing force can be arbitrarily set, and thereby a mirror surface with a desired surface roughness can be obtained.

Furthermore, since the elastic body is a coil spring, the polishing head has good responsiveness to unevenness on the surface to be polished, and the rotating shaft to which the polishing head is attached is located below the actuator that suspends the housing. Since the elastic body that presses the rotating shaft and the actuator are arranged in series, the operating force from the actuator and the elastic body is directly and precisely transmitted to the polishing head. can do.

In addition, a catch made of a load cell is installed in the middle part of the rotating shaft via the bearing, and a cup-shaped receiver is attached to the housing so that the distance between the catch and the catch can be adjusted by moving. The elastic body is interposed between the catch seat and the cup-shaped receiver, the pressing force of the elastic body is detected by the load cell, and the distance between the catch seat and the cup-shaped receiver is adjusted in response to this detection signal. By adjusting the polishing head, the pressing force of the polishing head is adjusted to a predetermined pressure.
The pressing force of the polishing head against the surface to be polished can be corrected to an arbitrarily set value, and even if the pressing force by the elastic body itself is outside the range where it can be maintained constant against unevenness of the surface to be polished, it will be smooth. Moreover, the pressing force can be automatically adjusted and maintained at a constant level, and a uniformly polished surface can always be obtained.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings. FIG. 1 shows an electrolytic buffing composite polishing apparatus according to this embodiment, and in the figure, reference numeral 1 indicates a housing. The housing 1 is suspended via an actuator 3 from a base 2 for mounting the device disposed above the housing 1, and fitting holes 4 perforated at each corner are vertically provided from the base 2. The guide rod 5 is fitted into the guide rod 5, and the actuator 3 is driven up and down to move up and down in the vertical direction with respect to the surface A to be polished. This housing 1
A motor 6 is fixedly supported, and a cylindrical drive shaft 7 is rotatably supported at a position apart from the motor 6 through a bearing 8 around a vertical axis. This drive shaft 7 is interlocked and connected to the motor 6 via a belt pulley type reduction mechanism 9, and a rotary shaft 11 is provided in a hollow portion 10 and is freely movable only in the axial direction of the drive shaft 7 via a rotation transmission means. It is supported by being inserted into. That is, a key 12 is embedded in the outer peripheral surface of the rotating shaft 11, and a key groove 13 into which the key 12 engages is formed in the drive shaft 7, and the engagement between the key 12 and the key groove 13 is As a result, while the rotating shaft 11 is freely movable with respect to the driving shaft 7, the rotational force of the driving shaft 7 is transmitted to rotate the rotating shaft 11. In addition, this rotation transmission means may be one based on spline fitting.

The rotating shaft 11 is a hollow shaft with a through hole 14 formed in the axial direction, and a polishing head 16 is attached to its lower end via an insulating plate 15, while a rotary joint 17 is attached to its upper end. The electrolytic solution is configured to be supplied to the through hole 14 via the rotary joint 17.

The polishing head 16 has an abrasive material 19 made of non-woven fabric affixed to the lower surface of the trochanter-shaped electrode plate 18, and an electrolyte reservoir 20 is formed between the abrasive material 19 and the outlet opening of the through hole 14. It was formed. A brush holder 22 is provided at a position close to the electrode plate 18 of the polishing head 16 via an insulating support rod 21.
is attached to the brush holder 22, and the power supply brush 24 is pressed against the circumferential surface of the electrode plate 18 by the spring force of a spring 23 built into the brush holder 22. Reference numeral 25 denotes a power supply line, which is connected to the cathode side of the DC power source for electrolysis, and feeds electrolysis power to the power supply brush 24.

A bearing 26 is provided at the axially intermediate portion of the rotating shaft 11.
A catch seat 27 is mounted through the seat 27, and a load cell 28 is installed inside the upper surface of the catch seat 27. On the other hand, a cup-shaped receiver 30 is screwed into the guide hole 29 of the housing 1 through which the receiver 27 is inserted and guided, and a compression coil spring is formed between the cup-shaped receiver 30 and the receiver 27. Elastic body 31
is interposed. The load cell 28 receives the elastic body 31, detects the elastic force of the elastic body 31, and outputs the detection signal to the calculation control circuit 32. This arithmetic control circuit 32 receives the output of the load cell 28, calculates the amount of change in the pressing force of the polishing head 16 due to a change in the elastic force of the elastic body 31, and also calculates the amount of change in the pressing force of the polishing head 16 in order to correct the pressing force to the set pressing force. A control signal based on the actuator 3 is fed back to the actuator 3, and the actuator 3
receives this control signal and moves up and down by an appropriate stroke to adjust the elastic force of the elastic body 31 to a desired value. More specifically, the calculation control circuit 32 performs the following calculations.

That is, the amount of change ΔP in pressing force in this case is ΔP=P−P1=kΔx, where P: set pressing force, P1: load cell 28
k: spring constant, Δx: amount of change in length of elastic body 31.

Therefore, the amount of change Δx in the length of the elastic body 31 is calculated so that the amount of change ΔP in the pressing force is always 0, and the amount of movement of the actuator 3 is controlled based on the result of this calculation. Also, load cell 2
The value of the pressing force detected by 8 can be monitored by a motor device (not shown), and the pressing force may be determined to be optimal, for example, when the polished surface A has large undulations or irregularities and the elastic force of the elastic body 31 changes significantly. If the value rises or falls abnormally, the operator can be notified by an indicator light or alarm light.

Therefore, in this embodiment, the actuator 3 and the arithmetic control circuit 32 constitute elastic force adjustment means.

In the above configuration, at the time of polishing, after connecting the electrode plate 18 to the cathode of the DC power source for electrolysis and the material to be polished 33 to the anode of the power source via the power supply brush 24, the actuator 3 is operated and the housing 1 is is lowered and the polishing head 16 is pressed onto the surface A to be polished. Next, the pressurized electrolytic solution is supplied from the rotary joint 17 through the through hole 14 to the liquid reservoir 20, and the electrolytic solution is exuded from the liquid reservoir 20 onto the abrasive material 19. On the other hand, by driving the motor 6, the polishing head 1 is moved through the drive shaft 7 and the rotating shaft 11.
6 is rotated, and power is supplied from the power supply brush 24 to the electrode plate 18. Then, the surface A to be polished is polished with the abrasive grains mixed in the abrasive material 19, and a current flows through the electrolytic solution flowing between the abrasive materials 19 as a medium, resulting in a combined action of electrolysis and mechanical buffing. Electrolytic buffing composite polishing is performed.

In this case, in order to optimize the abrasion removal effect on the surface A to be polished, the screwing position of the cup-shaped receiver 30 is adjusted in advance to set the elastic force of the elastic body 31 to an appropriate value. Furthermore, since the housing 1 is suspended by the actuator 3, the weight of the device is supported by the base 2 via the actuator 3, and thereby the weight of the polishing head 16 and rotating shaft 11 and the elastic body 31 are The sum of the elastic force and the elastic force acts as a pressing force of the polishing head 16 against the surface A to be polished. Therefore, the pressing force of the polishing head 16 against the surface A to be polished is
Fine adjustments can be easily made by adjusting the spring force of 1, and a mirror surface with any desired surface roughness can be obtained.If the elastic force of the elastic body 31 is set to 0, the pressing force is Since the weight can be reduced to the sum of the weight of the polishing head 16 and the polishing head 16, a mirror surface with extremely low surface roughness can be obtained with a small pressing force. In addition, since the members that make up these pressing forces are lightweight, they can move up and down while smoothly following the undulations and irregularities of the surface A to be polished, and even on such a surface A to be polished, uniform polishing can be achieved. You can do it.

Next, the elastic force of the elastic body 31 is detected by the load cell 28, and the detection signal is output from the load cell 28 to the arithmetic control circuit 32, and the actuator 3 is actuated by the control signal output from this circuit 32, and the housing 1 is The entire body is moved up and down by the amount of movement based on the control signal. As a result, the distance between the cup-shaped receiver 30 and the receiver 27 is relatively widened,
The elastic body 31 expands and contracts to automatically adjust the elastic force to the set value. Further, in this case, since the pressing force of the polishing head 16 can be adjusted and maintained as desired while observing the monitor device, the surface to be polished A can be finished to any desired surface roughness. Furthermore, when a warning is issued, the polishing operation of the device can be immediately stopped.

FIG. 2 shows another embodiment of the present invention, and in the figure, parts having the same configuration and function as those of the previous embodiment are given the same reference numerals, and the explanation thereof will be omitted.

In the embodiment shown in this figure, the actuator 3 has only the function of raising and lowering the housing 1, and a cup-shaped holder 30 serving as an elastic force adjustment means is screwed into or screwed into the housing 1. A rotary drive mechanism 34 is built in, and the rotary drive mechanism 34 and the load cell 28 are connected to the arithmetic control circuit 3.
2, the detection signal of the load cell 28 is converted into a control signal by the arithmetic control circuit 32, and sent to the rotation drive mechanism 34, and the cup-shaped receiver 30 is rotated by the rotation drive mechanism 34. The elastic force of the elastic body 31 is increased or decreased by changing the screwing position. In this case, a hydraulic or pneumatic cylinder can be used as the actuator 3.

FIG. 3 shows still another embodiment of the present invention, and in the figure, parts having the same configuration and operation as those of the previous embodiment are designated by the same reference numerals, and the explanation thereof will be omitted.

In the embodiment shown in this figure as well, the actuator 3 is connected to the housing 1 as in the other embodiments.
However, instead of the structure in which the cup-shaped receiver 30 is screwed into the guide hole 29 of the housing 1 in each of the above embodiments, the cup-shaped receiver 30 is screwed into the guide hole 29. It is equipped with a cup-shaped receiver 35 that can be moved up and down without any movement, and this cup-shaped receiver 35 is attached to the housing 1.
The movement is controlled by the expansion and contraction of the actuator 36 suspended from the actuator 36.
is electrically connected to the load cell 28 via the arithmetic control circuit 32, and the actuator 36 expands and contracts in response to the detection signal of the load cell 28, thereby creating a gap between the cup-shaped receiver 35 and the receiver seat 27. The elastic force of the elastic body 31 interposed therein is increased or decreased.

It goes without saying that in the present invention, various design changes can be made in addition to the above-mentioned embodiments.

(Effects of the Invention) As described above, according to the composite polishing device of the present invention,
A cylindrical drive shaft is rotatably supported in a housing that is vertically suspended from the lower surface of the base via an actuator, and the cylindrical drive shaft is rotated by a drive motor disposed in the housing. At the same time, a rotating shaft that rotates integrally with the cylindrical drive shaft and has an electrolyte supply hole inside that is movable up and down is inserted into the cylindrical drive shaft, and a polishing head that performs electrolytic buffing compound polishing is attached to the lower end of this rotating shaft. At the same time, a rotary joint for supplying electrolyte is attached to the upper end, and a catch seat with a load cell inside is attached to the middle part of the rotating shaft via a bearing. Since it has a structure in which a cup-shaped receiver is attached to the housing so that the distance between the seat and the seat can be adjusted, and an elastic body made of a coil spring is interposed between the receiver and the cup-shaped receiver, it is heavy. Regardless of the presence of a housing or a drive motor, the sum of the relatively lightweight polishing head, the weight of the rotating shaft, and the elastic force of the elastic body can act as a pressing force of the polishing head against the surface to be polished. The pressing force of the polishing head can be finely adjusted more accurately than the elastic body, and the small pressing force of the elastic body enables mirror polishing with extremely low surface roughness.

Furthermore, since the elastic body is a coil spring, the polishing head has good responsiveness to unevenness on the surface to be polished, and the rotating shaft to which the polishing head is attached is located below the actuator that suspends the housing. Since the elastic body that presses the rotating shaft and the actuator are arranged in series, the operating force from the actuator and the elastic body is directly and precisely transmitted to the polishing head. In addition, since the elastic body is composed of a coil spring, the pressing force of the polishing head can be precisely and finely adjusted.

In addition, a catch having a load cell inside is attached to the middle part of the rotating shaft via a bearing, and a cup-shaped receiver is attached to the housing so that the distance between the catch and the catch can be adjusted by moving. The elastic body is interposed between the seat and the cup-shaped receiver, the pressing force of the elastic body is detected by the load cell, and the distance between the seat and the cup-shaped receiver is adjusted in response to this detection signal. Since the pressing force of the polishing head is adjusted to a predetermined pressure by adjusting the polishing head, the pressing force of the polishing head against the surface to be polished can be corrected to an arbitrarily set value. Even if the pressing force of the elastic body itself is outside the range where it can be kept constant against the unevenness of the surface to be polished, it can smoothly and automatically adjust and maintain a constant pressing force, so that a uniform polished surface can always be obtained. It is.

Furthermore, the structure is such that the rotational driving force of the drive unit such as the drive motor is transmitted to the polishing head without affecting the elastic force of the elastic body.
The rotating shaft moves up and down smoothly with respect to the surface to be polished, and the lightweight polishing head and the rotating shaft can be made to sensitively follow the undulations and irregularities of the surface to be polished, and the elastic force of the elastic body via the load cell This allows for more accurate adjustment.

Further, the electrolyte can be supplied through the fixed housing to the hollow through hole of the rotary shaft disposed in the housing through the rotary joint attached to the upper end of the rotary shaft. Electrolytic compound polishing can be performed by feeding an electrolytic solution into the polishing head attached to the lower end of the polishing head.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing one embodiment of the present invention, FIG. 2 is a longitudinal cross-sectional view showing another embodiment of the present invention, and FIG.
The figure is a longitudinal sectional view showing still another embodiment of the present invention. 1...Housing, 2...Fixed base, 3...
Lifting actuator, 7... Drive shaft, 11...
Rotating shaft, 12, 13...Rotation transmission means, 16...
Polishing head, 28... Load cell, 30... Screw member, 31... Elastic body, 35... Spring retainer, 3
6...actuator.

Claims (1)

[Scope of Claims] 1. A guide rod hanging from the lower surface of the base guides the housing in a non-rotatable manner so that it can rise and fall freely, and the housing is suspended from the base via an actuator. A cylindrical drive shaft is rotatably supported with its core facing the actuating direction of the actuator, and this cylindrical drive shaft is rotated by a drive motor disposed in the housing. A rotary shaft that rotates integrally with the drive shaft and has an electrolyte supply hole inside that is movable up and down is inserted, and the upper and lower ends of the rotary shaft protrude from the upper end of the cylindrical drive shaft and the lower end surface of the housing, respectively. A polishing head for electrolytic buffing and compound polishing is attached to the lower end of the protrusion, and a rotary joint for supplying electrolyte is attached to the upper end of the protrusion.Furthermore, a seat with a load cell installed in the middle of the rotating shaft is installed. A cup-shaped receiver is attached to the housing through a bearing and the distance between the receiver and the receiver can be adjusted by moving against the receiver, and an elastic body made of a coil spring is provided between the receiver and the cup-shaped receiver. is inserted, the pressing force of the elastic body is detected by the load cell, and in response to this detection signal, the distance between the receiving seat and the cup-shaped receiver is adjusted, thereby increasing the pressing force of the polishing head to a predetermined pressure. An electrolytic buffing compound polishing device characterized in that it is configured to adjust to. 2. The space between the catch seat and the cup-shaped receiver is adjusted by moving the housing up and down by operating the actuator in response to a detection signal from a load cell. The electrolytic buffing composite polishing device described. 3. The electrolyzer according to claim 1, wherein the distance between the catch seat and the cup-shaped receiver is adjusted by moving the cup-shaped receiver up and down in response to a detection signal from a load cell. Buffing compound polishing device.