JP2021112775A - Surface polishing jig, characteristic detection device and surface polishing device - Google Patents

Abstract

To provide a surface polishing jig which can polish a surface with good efficiency even if an object to be polished has an insulation layer on the whole area.SOLUTION: In a surface polishing jig, a cylindrical insulator 12 is located inside a cylindrical electrode 11. The jig comprises, inside the cylindrical insulator 12, a first electrode part which is an open hole 12a capable of passing a polishing tool 40, a second electrode part which brings a plate electrode 15, which is a magnet, into contact with a polishing object with an insulation layer and fix the same, and two connection parts 13, 14 which can connect a characteristic detection device, which detects characteristics of a circuit which is established in the order of the cylindrical electrode 11, the polishing tool 40, the polishing object and the plate electrode 15 of the second electrode part when inserting the polishing tool 40 into the open hole 12a of the first electrode part, to the cylindrical electrode 11 and the plate electrode 15 respectively.SELECTED DRAWING: Figure 2

Description

The present invention relates to a surface polishing jig used when polishing an object to be polished having an insulating layer on the surface until a metal surface appears, a characteristic detection device connected to the surface polishing jig, and the characteristic detection device. The present invention relates to a surface polishing device to which a signal line from the above can be connected or includes the characteristic detection device inside.

Conventionally, an object to be measured, which is a metal object, is irradiated with X-rays, an X-ray diffraction image is imaged by the diffraction X-ray generated by the object to be measured, and the residual stress of the object to be measured is obtained from the imaged diffraction image. An X-ray diffraction measuring device for measuring the above is known. In order to perform measurement with this X-ray diffraction measuring device, it is necessary that the metal that is the material of the object to be measured is exposed on the surface. Therefore, if there is a layer different from the material of the measurement object, such as a layer by painting or a layer coated with resin on the surface of the measurement object, it is necessary to remove this layer by polishing. When measuring an object to be measured, which is a metal object, with an X-ray diffractometer, the metal of the material needs to be exposed only at the location where the X-ray is irradiated. Therefore, when polishing the surface of the object to be measured, As a polishing device, it is common practice to use a device in which the drill blade of an electric drill is a blade (for example, an end mill) with less digging in the axial direction. When surface polishing is performed by such a polishing device, it is possible to visually confirm whether or not the metal of the material has come out on the surface, but in the visual confirmation, the surface of the object to be polished may be excessively polished. Many inefficient. Therefore, a means may be taken to detect the conduction state between the polishing blade of the polishing apparatus and the object to be polished, and to detect that the metal of the material has come out on the surface due to the detection of the continuity. In machining using a rotating tool, as a method of detecting the conduction state between the tool and the machined object, for example, as shown in Patent Document 1 below, between the tool and the machined object. There is a method of applying a voltage and detecting a current. Further, as shown in Patent Document 2 below, a capacitor is formed by providing an electrode around the vicinity of a portion in a conductive state with the tool, and an AC voltage is applied between the electrode and the object to be processed. There is also a method of detecting the current when applied.

Japanese Unexamined Patent Publication No. 5-190374 JP-A-2002-233933

The device for measuring X-ray diffraction of a measurement object, which is a metal object, is a device that is small and can be transported to a place where the measurement object is located, such as the device manufactured and sold by the applicant of the present application, for measurement. However, there are cases where the entire surface of a metal object measured by such a device is covered with an insulating layer, such as being painted on the entire surface. When surface polishing such a metal object, in order to detect the conduction state between the tool and the object to be polished using the conventional technique, the electrode is polished at a point different from the measurement point of the object to be polished. Must be connected so that a voltage can be applied between the tool and the object to be polished. For this reason, polishing for X-ray diffraction measurement and polishing for voltage application must be performed respectively, and the efficiency is rather worse than when it is visually confirmed that the metal of the material has come out on the surface. Therefore, at present, when the polishing device is transported to a place where the object to be polished is to be polished and the surface of the object is polished, it is visually confirmed that the metal has come out on the surface, which is inefficient.

The present invention has been made to solve this problem, and an object of the present invention is to use a polishing tool and an object to be polished, which are used when polishing an object to be polished having an insulating layer on the surface until a metal surface appears. It is a surface polishing jig for detecting the conduction state between the two, and even if the object to be polished is entirely covered with an insulating layer, the surface is efficiently polished without extra polishing. It is an object of the present invention to provide a surface polishing jig which can be used. Another object of the present invention is to provide a characteristic detection device that is connected to the surface polishing jig to accurately detect the conduction state. Further, it is an object of the present invention to provide a surface polishing device to which a signal line from the characteristic detecting device can be connected or which includes the characteristic detecting device inside and which facilitates a surface polishing operation.

In order to achieve the above object, the feature of the present invention is that a cylindrical insulator is arranged inside the cylindrical electrode, and the inside of the cylindrical insulator is a through hole through which a polishing tool can pass. When a polishing tool is inserted into the through hole of the first electrode portion, the second electrode portion which has a magnet portion and the electrode is brought into contact with and fixed to the object to be polished having an insulating layer, and the first electrode portion, the first electrode portion is used. A characteristic detection device that detects the characteristics of the circuit consisting of the electrodes of the 1 electrode section, the polishing tool, the object to be polished, and the electrodes of the 2nd electrode section is installed on the electrodes of the 1st electrode section and the electrodes of the 2nd electrode section, respectively. It is a surface polishing jig provided with two connecting portions that enable connection.

According to this, the surface polishing jig is set on the polishing target so that the polishing portion of the polishing target is directly below the through hole of the first electrode portion of the surface polishing jig, and the surface polishing jig is set. When a polishing tool is inserted into the through hole of the first electrode portion of the above, a first capacitor composed of the electrode of the first electrode portion and the polishing tool is provided between the electrode of the first electrode portion and the electrode of the second electrode portion. It can be regarded as a circuit including a switch consisting of a polishing tool and a conduction state of the object to be polished, and a second capacitor composed of the electrode of the second electrode portion and the object to be polished. Since the characteristics of this circuit change greatly depending on the conduction state (switch ON / OFF) between the polishing tool and the object to be polished, the surface polishing jig is used while the polishing tool is rotated to polish the surface. If a characteristic detection device is connected to the connection part of the tool and the characteristics of the circuit between the electrodes of the first electrode part and the electrodes of the second electrode part are detected, the timing at which the characteristics change significantly is detected for polishing. It is possible to detect the continuity between the tool and the object to be polished. That is, even if the object to be polished has an insulating layer on the entire surface, the surface can be efficiently polished without performing extra polishing. Further, since the second electrode portion has a magnet, the surface polishing jig can be fixed to the object to be polished during surface polishing if the magnetic force is adjusted appropriately, and the surface is polished even if the object to be polished is not horizontal. A jig can be set. Note that detecting the characteristics of a circuit means detecting some physical quantity of the circuit when some action is performed on the circuit.

Further, another feature of the present invention is a cylindrical or prismatic concave portion having the central axis of the through hole of the first electrode portion as a substantially central axis, and the head of a bolt in which the object to be polished is tightened to the plate. In the case of a portion, the surface polishing jig is provided with a recess sized to fit the head.

According to this, when the object to be polished is the head of a bolt tightened to the plate, a recess may be fitted into the head to fix the surface polishing jig, and the object to be polished is the plate. In some cases, the surface polishing jig may be fixed as it is, so that the surface polishing can be performed on various objects to be polished by using the surface polishing jig described above.

Another feature of the present invention is the capacitor formed from the electrode of the first electrode portion and the polishing tool inserted into the through hole in the characteristic detection device connected to the connection portion of the surface polishing jig described above. It is a charge / discharge circuit that repeatedly charges and discharges the electrode of the second electrode portion and the capacitor formed from the object to be polished at a set cycle, and during charging, the ground and the electrode of the first electrode portion are connected to each other. A charge / discharge circuit in which an equal amount of electric charge is transferred between the space and between the ground and the electrode of the second electrode portion, and a charge / discharge circuit when charging and discharging are repeatedly performed by the charge / discharge circuit. It is provided with a strength detection circuit for detecting the strength of a voltage or a current at a predetermined location.

According to this, the potential of the electrode of the first electrode portion changes greatly depending on the conduction state (switch ON / OFF) between the polishing tool and the object to be polished regardless of whether or not the object to be polished is grounded. Further, regardless of whether the polishing object is grounded or not, when the polishing tool and the polishing object are electrically connected, the amount of electric charge transferred to each capacitor during charging is equal and substantially constant. The potential of the electrode of the first electrode portion becomes substantially constant. Therefore, if the strength detection circuit detects the strength of the voltage or current at an appropriate location, the detected strength can be compared with the preset strength to accurately conduct the continuity between the polishing tool and the object to be polished. Can be detected. Further, since the charge / discharge circuit can be configured by using a DC power supply, the characteristic detection device can be made by using a battery, the characteristic detection device can be made small, and the location of the object to be polished is not restricted. Can be done.

Another feature of the present invention is the capacitor formed from the electrode of the first electrode portion and the polishing tool inserted into the through hole in the characteristic detection device connected to the connection portion of the surface polishing jig described above. Two The electrodes of the electrode part and the capacitor formed from the object to be polished are used as one of the capacitors in the circuit, and the bridge circuit composed of the element having resistance in the AC current and the AC power supply and the AC power supply of the bridge circuit are AC. When a voltage is applied, a strength detection circuit for detecting the strength of the voltage or current at a portion bridging between the parallel circuits of the bridge circuit is provided.

According to this, regardless of whether the polishing object is grounded or not, the voltage at the point where the parallel circuit of the bridge circuit is bridged is determined by the conduction state (switch ON / OFF) between the polishing tool and the polishing object. Or the intensity of the current fluctuates greatly. Therefore, if the intensity of voltage or current is detected by the intensity detection circuit and the detected intensity is compared with the preset intensity, the continuity between the polishing tool and the object to be polished can be detected accurately.

Another feature of the present invention is the through hole of the first electrode portion in the surface polishing apparatus capable of inputting a signal based on the characteristic output by the characteristic detecting apparatus connected to the connection portion of the surface polishing jig described above. It is provided with a driving means for rotationally driving the polishing tool to be inserted into the device and a control means for controlling the operation and stopping of the driving means by a signal based on the characteristic input from the characteristic detection device.

According to this, if the control means detects the continuity between the polishing tool and the object to be polished by the signal based on the characteristic output by the characteristic detection device and stops the driving means, the operator operates the surface polishing device. Since it is sufficient to concentrate on polishing the object to be polished, the efficiency of the polishing work is improved. In this case, the surface polishing device is separate from the characteristic detecting device, and there are both a form in which a signal line from the characteristic detecting device is connected and a form in which the surface polishing device includes the characteristic detecting device inside.

It is an external view of the surface polishing jig which concerns on one Embodiment of this invention. It is a partial cross-sectional view when the surface polishing jig of FIG. 1 is set on the object to be polished, and the polishing tool of the surface polishing apparatus is inserted into the through hole of the surface polishing jig. It is a figure which showed the circuit which holds between the two connection parts of the surface polishing jig when the characteristic detection apparatus is connected to the surface polishing jig in the state of FIG. It is a block diagram which concerns on one Embodiment of the characteristic detection apparatus connected to the surface polishing jig. FIG. 5 is a diagram showing that the signal strength corresponding to the voltage strength output by the low-pass filter of the characteristic detection device of FIG. 4 changes depending on the conduction state between the polishing tool and the polishing object. It is a block diagram which concerns on another embodiment of the characteristic detection apparatus connected to the surface polishing jig. It is a figure which showed the structure of the surface polishing apparatus which uses the signal output by the characteristic detection apparatus of FIG. 4 or FIG. 6 for drive control of a polishing tool.

The structure of the surface polishing jig according to the embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 is an external view of the surface polishing jig 1, and FIG. 2 shows that the surface polishing jig 1 is set on the object to be polished and the polishing tool 40 of the surface polishing device 4 is set on the surface polishing jig 1. It is a figure which showed only the surface polishing jig 1 as a cross-sectional view when it was inserted into a through hole 12a. In the present embodiment, the object to be polished is the head of the bolt Bt fastened to the plate Pt, and the plate Pt and the bolt Bt have an insulating film formed by painting on the surface thereof. Then, in the surface polishing using the surface polishing jig 1 shown in FIGS. 1 and 2, the polishing tool 40 is rotated to remove the insulating film from a part of the head of the bolt Bt, and the material of the bolt Bt is made of the material. The surface polishing jig 1 is used to expose the metal to the surface, and is used to detect the conduction state between the polishing tool 40 and the bolt Bt. The purpose of exposing the metal of the material of the bolt Bt to the surface is to enable X-ray diffraction measurement for the applicant of the present application as described in the background technology, but the object is not limited to this. It may have any purpose as long as it is necessary to expose the metal of the material to the surface in a part of the above.

As shown in FIG. 1, the surface polishing jig 1 is cylindrical, and a ring-shaped flat plate electrode 15 is attached to the bottom surface 10b of the columnar main body 10, and a through hole 12a is formed in the central axis. I am doing. The main body 10 is made of resin, and the flat plate electrode 15 is made of magnet. As a result, the surface polishing jig 1 is lightweight and can be easily carried. If the material of the plate Pt is a magnetic material such as iron, the surface polishing jig 1 is fixed to the plate Pt so that the polishing portion is directly below the through hole 12a. Can be done. Since the plate Pt has an insulating film formed by painting as described above, when the flat plate electrode 15 is attracted to the plate Pt, the metal which is the material of the plate Pt and the flat plate electrode 15 face each other with the insulating film in between. Therefore, it can be considered that the capacitor is formed. Then, if the surface polishing jig 1 is fixed to the plate Pt, the capacitance of this capacitor is constant. Further, the main body portion 10 has connection portions 13 and 14 fixed to the side surface 10e for connecting to the characteristic detection device 2 described later with a cable. The connection portions 13 and 14 are land-type terminals, and cables can be connected by inserting a banana plug. It should be noted that which part of the surface polishing jig 1 the connecting portions 13 and 14 are conducting with each other will be described later.

As shown in FIG. 2, a cylindrical recess 10a having a central axis substantially the same as that of the main body 10 is formed on the bottom surface 10b of the main body 10, and the size of the recess 10a is set on the head of the bolt Bt to be polished. It is sized to fit. As a result, when the surface polishing jig 1 is set on the plate Pt so that the head of the bolt Bt is fitted into the recess 10a, the center of the head of the bolt Bt is directly below the through hole 12a.

As shown in FIG. 2, the main body 10 is formed with a through hole having a central axis substantially the same as that of the main body 10, and a metal cylindrical electrode 11 is inserted into the through hole and fixed. The metal of the cylindrical electrode 11 may have a high electrical conductivity, for example, copper. A resin cylindrical insulator 12 is fixed inside the cylindrical electrode 11, and the inside of the cylindrical insulator 12 is a through hole 12a, the diameter of which is slightly larger than the diameter of the polishing tool 40. ing. As a result, the surface polishing jig 1 is set on the plate Pt so that the head of the bolt Bt is directly below the through hole 12a, and then the polishing tool 40 is inserted into the through hole 12a to polish as shown in FIG. The tip of the tool 40 reaches the head of the bolt Bt. At this time, since the cylindrical electrode 11 surrounds the vicinity of the metal polishing tool 40, it can be considered that a capacitor is formed. Further, the length of the cylindrical electrode 11 is slightly shorter than the length of the through hole formed in the central axis of the main body 10 and the length of the cylindrical insulator 12, and is above the upper end of the cylindrical electrode 11. And below the lower end of the cylindrical electrode 11, sealing materials 18 and 19 for insulation are coated so that the surface of the main body 10 is not dented and the chemical is cured. That is, since the cylindrical insulator 12 is inside the cylindrical electrode 11 and the upper end and the lower end are sealed, the cylindrical electrode 11 does not come into contact with another object. As a result, even if the position of the polishing tool 40 changes in the lateral direction in the central axis direction, or even if chips are generated due to surface polishing of the head of the bolt Bt, the polishing tool 40 and the cylindrical electrode It is not short-circuited with 11, and the capacitor formed by the polishing tool 40 and the cylindrical electrode 11 continues to be maintained during the polishing operation.

If the cylindrical insulator 12 is made of resin, it is good in terms of insulating properties, but since there is a possibility that the rotating polishing tool 40 may come into contact with the cylindrical insulator 12, the resin made of a material resistant to this contact is selected. good. For example, polytetrafluoroethylene (PTFE) has a small coefficient of friction, so that it has good lubricity, and also has good weather resistance and heat resistance, so that it is suitable as a material for the cylindrical insulator 12. Further, the sealing materials 18 and 19 are good as long as they are easy to apply and have good insulation, weather resistance and heat resistance after curing, and are, for example, silicone. Hereinafter, the cylindrical electrode 11 is inserted and fixed in a through hole having substantially the same central axis as the main body 10, and the cylindrical insulator 12 is inserted and fixed inside the cylindrical electrode 11, and further. The portion formed by sealing the upper end and the lower end of the cylindrical electrode 11 is referred to as a first electrode portion. Further, a portion in which the flat plate electrode 15 which is a magnet is fixed to the bottom surface 10b of the main body portion 10 is referred to as a second electrode portion.

As shown in FIG. 2, the main body 10 has a through hole 10c formed from the side surface 10e toward the through hole of the central axis, and the through hole 10c has an insertion portion of the connection portion 13 from the entire length of the through hole 10c. A conducting wire 16 which is slightly longer than the length obtained by subtracting the length of 13a is inserted. Then, since the insertion portion 13a of the connecting portion 13 is inserted from the side surface 10e into the through hole 10c and the connecting portion 13 is fixed by the side surface 10e, the conducting wire 16 is pressed against the cylindrical electrode 11 and the insertion portion 13a. There is. As a result, the conductive portion inside the connecting portion 13 is conducting with the cylindrical electrode 11. Further, in the main body 10, a through hole 10d is formed upward from the bottom surface 10b, a conducting wire 17 slightly longer than the total length of the through hole 10d is inserted in the through hole 10d, and a flat plate which is a magnet is inserted in the bottom surface 10b. Since the electrode 15 is fixed, the conductor 17 is pressed against the flat plate electrode 15. Then, a through hole 10f is formed from the side surface 10e toward a position slightly lower than the upper end of the through hole 10d, and the insertion portion 14a of the connecting portion 14 is inserted into the through hole 10f. Since the connecting portion 14 is fixed by the side surface 10e and the length of the insertion portion 14a is slightly longer than that of the through hole 10f, the conducting wire 17 is pressed against the insertion portion 14a. As a result, the conductive portion inside the connecting portion 14 is electrically connected to the flat plate electrode 15 which is a magnet.

The method of manufacturing the surface polishing jig 1 will be described below. First, the resin is molded into a columnar shape as shown in the main body 10 of FIGS. 1 and 2, and a through hole having a diameter substantially the same as the outer diameter of the cylindrical electrode 11 is formed in the central axis of the molded main body 10 to form a bottom surface. A recess 10a into which the head of the bolt Bt can be fitted from 10b is opened with the central axis and the central axis of the main body 10 substantially the same. Next, a through hole 10c having a size capable of inserting the conducting wire 16 from the side surface 10e of the main body portion 10 is opened toward the central axis of the main body portion 10, and a through hole 10d having a size capable of inserting the conducting wire 17 from the bottom surface 10b is formed on the side surface. The length from 10e is about the same as the length of the insertion portion 14a of the connecting portion 14, and the opening is made so as to have an appropriate length upward from the position directly below the through hole 10c. Next, after applying an adhesive to the through hole formed in the central axis of the main body 10, the cylindrical electrode 11 is inserted and fixed so that the upper end and the lower end are slightly behind the surface of the main body 10. An adhesive is applied to the inside of the cylindrical electrode 11, a resin cylindrical insulator 12 is inserted, and the upper end and the lower end are fixed so as to be at the same positions as the surface of the main body 10. Next, the chemicals of the sealing materials 18 and 19 for insulation are applied to the upper and lower ends of the cylindrical electrode 11 so that the recessed portions are filled and cured. Next, the conducting wire 16 is inserted into the through hole 10c from the side surface 10e, the insertion portion 13a of the connecting portion 13 is inserted, and the connecting portion 13 is fixed to the side surface 10e with an adhesive. Next, the conducting wire 17 is inserted from the bottom surface 10b into the through hole 10d, an adhesive is applied to a predetermined portion of the bottom surface 10b, and then the flat plate electrode 15 which is a magnet is pressed and fixed, and the connection portion 14 is connected to the through hole 10f. The insertion portion 14a of the above is inserted, and the connection portion 14 is fixed to the side surface 10e with an adhesive. As a result, the surface polishing jig 1 is completed.

The driving portion of the surface polishing device 4 shown in FIG. 2 is an example. The surface polishing device 4 is insulated from the polishing tool 40, and the bolt Bt, which is an object to be polished, is formed by rotating the polishing tool 40. Any device may be used as long as it can polish the head of the device. The surface polishing device 4 shown in FIG. 2 is fixed by inserting the polishing tool 40 into the fixing portion 41 and tightening the screw 42, and the tip of the rotating shaft 45 is fixed to the flange portion 44, and the flange of the fixing portion 41 is fixed. The surface polishing apparatus 4 is insulated from the polishing tool 40 by being fixed by the screws of the insulator via the insulator 43 made of 41a and resin. Further, the polishing tool 40 may be any tool as long as the tip can polish the object by rotating.

In FIG. 3, the surface polishing jig 1 having the above-described structure is set on the object to be polished, the polishing tool 40 is inserted into the through hole 12a of the surface polishing jig 1, and the connection portion of the surface polishing jig 1 is shown. It is a figure which showed the circuit formed between the connection part 13 and 14 when the characteristic detection device 2 was connected to 13 and 14. In other words, it is a figure which showed the circuit formed between the connection part 13 and 14 when the characteristic detection device 2 is connected to the connection part 13 and 14 in the state of FIG. As described above, the connecting portion 13 is conducting to the cylindrical electrode 11, and the connecting portion 14 is conducting to the flat plate electrode 15 which is a magnet. A cylindrical insulator 12 which is a resin is fixed to the inside of the cylindrical electrode 11, and a polishing tool 40 is inserted into the through hole 12a of the cylindrical insulator 12. The cylindrical electrode 11 and the polishing tool Since the 40s are close to each other, it can be assumed that the capacitor C1 is formed, and that the capacitor C1 is conducting to the connection portion 13. Further, the polishing tool 40 does not conduct to the surface polishing device 4 side due to the insulator 43, and does not conduct to the bolt Bt and the plate Pt, which are the objects to be polished, before polishing, but the head of the bolt Bt. When the bolt Bt comes into contact with the metal material of the bolt Bt, it conducts to the object to be polished, so that it can be said that the switch SW is formed. Further, since the flat plate electrode 15 which is a magnet is in contact with the plate Pt via the insulating layer, it can be assumed that the capacitor C2 is formed, and it is assumed that the capacitor C2 is conducting to the connection portion 14. be able to.

As can be seen from the circuit shown in FIG. 3, when the switch SW is turned on (when the polishing tool 40 and the material of the bolt Bt come into contact with each other), the capacitor C1 and the capacitor C2 are connected in series between the connection portions 13 and 14. Assuming that the capacitances of the capacitors C1 and C2 are C1 and C2, respectively, the total capacitance is {C1 · C2 / (C1 + C2)}. Further, if the switch SW is OFF (unless the polishing tool 40 and the material of the bolt Bt come into contact with each other), the switch SW can be regarded as a capacitor having a capacitance of substantially 0, so that the total capacitance becomes substantially 0. That is, the capacitance between the connecting portions 13 and 14 changes greatly depending on whether the switch SW is turned on or off (depending on whether or not the bolt Bt of the polishing tool 40 is in contact with the material). Therefore, for polishing, a device capable of detecting a characteristic that greatly changes due to a change in capacitance between the connection portions 13 and 14 is connected as the characteristic detection device 2, and a timing at which the characteristic detected by the characteristic detection device 2 changes significantly is detected. The continuity between the tool 40 and the object to be polished can be detected.

As can be understood from the above description, in the surface polishing jig 1 of the above embodiment, the cylindrical insulator 12 which is a resin is arranged inside the cylindrical electrode 11, and the inside of the cylindrical insulator 12 is polished. Penetration of the first electrode portion which is a through hole 12a through which the tool 40 can pass, the second electrode portion which contacts and fixes the flat plate electrode 15 which is a magnet to the object to be polished having an insulating layer, and the first electrode portion. When the polishing tool 40 is inserted into the hole 12a, the characteristic of detecting the characteristics of the circuit consisting of the cylindrical electrode 11 of the first electrode portion, the polishing tool 40, the object to be polished, and the flat plate electrode 15 of the second electrode portion in this order. The detection device 2 is provided with two connecting portions 13 and 14 that enable the detection device 2 to be connected to the cylindrical electrode 11 of the first electrode portion and the flat plate electrode 15 of the second electrode portion, respectively.

According to this, the surface polishing jig 1 is set on the polishing object so that the polishing portion of the object to be polished is directly below the through hole 12a of the first electrode portion of the surface polishing jig 1, and the surface is polished. When a polishing tool is inserted into the through hole 12a of the first electrode portion of the jig 1, the cylindrical electrode 11 of the first electrode portion and the flat plate electrode 15 of the second electrode portion are connected to the cylinder of the first electrode portion. A circuit consisting of a capacitor C1 composed of a shape electrode 11 and a polishing tool 40, a switch SW composed of a conduction state of the polishing tool 40 and an object to be polished, and a capacitor C2 composed of a flat plate electrode 15 of a second electrode portion and an object to be polished. Can be regarded as. The characteristics of this circuit vary greatly depending on the conduction state (switch SW ON / OFF) between the polishing tool 40 and the object to be polished. Therefore, while the polishing tool 40 is rotated to polish the surface, the surface is polished. If the characteristic detection device 2 is connected to the connection portions 13 and 14 of the polishing jig 1 to detect the characteristics of the circuit between the cylindrical electrode 11 of the first electrode portion and the flat plate electrode 15 of the second electrode portion. By detecting the timing at which the characteristics change significantly, the continuity between the polishing tool 40 and the object to be polished can be detected. That is, even if the object to be polished has an insulating layer on the entire surface, the surface can be efficiently polished without performing extra polishing. Further, since the flat plate electrode 15 of the second electrode portion is a magnet, the surface polishing jig 1 can be fixed to the polishing target during surface polishing if the magnetic force is adjusted appropriately, and the polishing target is horizontal. The surface polishing jig 1 can be set without it.

Further, in the surface polishing jig 1 of the above embodiment, the surface polishing jig 1 is a cylindrical recess 10a having the central axis of the through hole 12a of the first electrode portion as a substantially central axis, and the object to be polished is tightened into the plate Pt. In the case of the head of the rolled bolt Bt, a recess 10a sized to fit the head is provided. According to this, when the object to be polished is the head of the bolt Bt tightened to the plate Pt, the recess 10a may be fitted into the head to fix the surface polishing jig 1 and the object to be polished. When the object is a plate Pt, the surface polishing jig 1 may be fixed as it is, so that the surface polishing jig 1 can be used to polish various objects to be polished.

To detect the characteristics of a circuit between the cylindrical electrode 11 of the first electrode portion and the flat plate electrode 15 of the second electrode portion means to detect some physical quantity of the circuit when any action is performed on the circuit. Therefore, various actions and physical quantities can be considered. Therefore, various types of characteristic detection devices can be considered as the characteristic detection device connected to the surface polishing jig 1, but the characteristic detection device 2 shown in FIG. 4 can accurately detect changes in the characteristics of the circuit and is compact. The location of the object to be polished is not restricted. The characteristic detection device 2 is connected to the connection portions 13 and 14 of the surface polishing jig 1, and the switch SW is turned on by detecting the characteristic that greatly changes due to the change in the capacitance between the connection portions 13 and 14. It is a device that detects the timing (the polishing tool 40 and the material of the bolt Bt come into contact with each other). This characteristic detection device 2 has connection portions 27 and 28, which are land-type terminals similar to the connection portions 13 and 14 of the surface polishing jig 1, and connects cables having banana plugs at the ends on both sides. By inserting the 13 and 14 into the connecting portions 27 and 28, respectively, the connecting portion 13 and the connecting portion 27 and the connecting portion 14 and the connecting portion 28 can be connected. This is to connect the connection portion 27 and the capacitor C1 and the connection portion 28 and the capacitor C2 in FIG.

The switch 20 outputs a signal to the ON-OFF circuit 21 each time the switch 20 is pressed, and the ON-OFF circuit 21 outputs an operation signal and a stop signal in order each time a signal is input. Further, the ON-OFF circuit 21 outputs a stop signal when a signal is input from the comparison circuit 32 described later. The operation signal and stop signal of the ON-OFF circuit 21 are input to the pulse train signal oscillation circuit 22, the constant current output circuit 23, and the constant current output circuit 24, and the pulse train signal oscillation circuit 22 has a period set when the operation signal is input. A pulse train signal is output, and a voltage is applied to the constant current output circuits 23 and 24 so that a current of a set intensity flows. The pulse train signal output by the pulse train signal oscillation circuit 22 is input to the switch circuits 25 and 26, and the switch circuits 25 and 26 switch the switch each time a pulse is input. That is, when the switch 20 is pressed from the stopped state, the capacitors C1 and C2 in FIG. 3 are repeatedly charged and discharged at a predetermined cycle.

When the switch SW is ON (the polishing tool 40 and the material of the bolt Bt are in contact with each other), the switch of the switch circuit 25 and the switch of the switch circuit 26 are switched at regular intervals, so that they are most charged. The amount of charge at the time is constant, and the negative pole side of the constant current output circuit 23 and the positive pole side of the constant current output circuit 24 are grounded by being connected to the ground terminal 29, so that the capacitors C1 and C2 are grounded. If the capacitance is constant, the potentials of the connecting portions 13 and 27 and the connecting portions 14 and 28 (the potentials of the cylindrical electrode 11 and the flat plate electrode 15) are constant. Further, in the discharge, the electric charge moves between the capacitors C1 and C2, but the constant current output circuit 23 and the constant current output circuit 24 are set to output currents of equal strength, and the switch circuits 25 and 26, respectively. Since the switches of are switched at the same timing, the charge amounts of the capacitors C1 and C2 are always the same, and the potentials of the connecting portions 13 and 27 and the connecting portions 14 and 28 at the time of the most discharge (cylindrical electrode 11). And the potential of the flat plate electrode 15) are also constant. This does not depend on the presence or absence of grounding of the plate Pt, which is the object to be polished. When the switches of the switch circuits 25 and 26 are switched at an early cycle, the circuit becomes a switched capacitor, and the potentials of the connecting portions 13 and 27 and the connecting portions 14 and 28 (potentials of the cylindrical electrode 11 and the flat plate electrode 15) become. It will always have a constant potential. Then, this potential is determined by the capacitance of the capacitors C1 and C2.

When the switch SW is in the OFF state (the material of the polishing tool 40 and the bolt Bt are not in contact with each other), the switch SW can be regarded as a capacitor having a capacitance of substantially 0, so that the entire capacitors C1, the switch SW and the capacitor C2 are also included. It can be regarded as a capacitor with zero capacitance. At this time, in charging, the constant current output circuit 23 and the constant current output circuit 24 become the upper limit of the set applied voltage, the constant current cannot flow, and the capacitors C1 and C2 are not charged. However, since the negative electrode side of the constant current output circuit 23 and the positive electrode side of the constant current output circuit 24 are grounded, the potentials of the connecting portions 13 and 14 (potentials of the cylindrical electrode 11 and the flat plate electrode 15) are substantially 0. It becomes constant at the potential of. This is a case where the plate Pt is not grounded. If the plate Pt is grounded, the electric charge is transferred to the capacitor C2 by the constant current output circuit 24 during charging, but the electric charge is not transferred to the capacitor C1. Then, in the discharge, the electric charge moves between the charged capacitor C1 and the uncharged capacitor C2. In this state, when the switches of the switch circuits 25 and 26 are switched at an early cycle, the potentials of the connecting portions 13 and 27 and the connecting portions 14 and 28 (the potentials of the cylindrical electrode 11 and the flat plate electrode 15) become a certain potential. To have. However, the potentials of the connecting portions 13 and 27 (the potentials of the cylindrical electrodes 11) are on the negative side.

That is, the potentials of the connecting portions 13 and 27 (the potentials of the cylindrical electrodes 11) are such that when the plate Pt is not grounded and the switch SW is changed from OFF to ON (the materials of the polishing tool 40 and the bolt Bt are not used). From the contact state to the contact state), the potential is determined by the capacitance of the capacitors C1 and C2 from approximately 0, and when the plate Pt is grounded, the potential is determined by the capacitance of the capacitors C1 and C2 from the negative potential. become. Therefore, regardless of whether the plate Pt is grounded or not, an appropriate potential lower than the potential of the connecting portions 13 and 27 (the potential of the cylindrical electrode 11) when the switch SW is ON is set, and the set potential is set to the connecting portion 13. By detecting that the potential of, 27 (the potential of the cylindrical electrode 11) has been exceeded, the contact between the polishing tool 40 and the material of the bolt Bt can be detected. In FIG. 5, when the plate Pt is not grounded, the voltage between the ground and the connecting portions 13 and 27 (cylindrical electrode 11) is applied, (a) the switch SW is OFF and (b) the switch SW is ON. It is the figure shown in the state. As shown in FIG. 5, since the voltage strength differs greatly between the OFF state and the ON state of the switch SW, if a strength slightly larger than 0 is set, the contact between the polishing tool 40 and the material of the bolt Bt can be detected. The circuits and devices after the voltage detection circuit 30 are circuits and devices for this detection. In the state where the plate Pt is grounded, (a) when the switch SW is OFF, the voltage strength is on the minus side, so there is no problem as long as the strength is set to be slightly larger than 0.

The voltage detection circuit 30 is a circuit that detects the voltage between the ground and the connection portions 13 and 27 (cylindrical electrode 11), and outputs a signal having a strength corresponding to the detected voltage. The low-pass filter 31 is a circuit that outputs a signal obtained by removing high-frequency components from the input signal. In the above description, when the polishing tool 40 and the material of the bolt Bt are in contact with each other, the potentials of the connecting portions 13 and 27 (the potentials of the cylindrical electrodes 11) are substantially constant regardless of the presence or absence of grounding of the plate Pt. However, this is based on the premise that the capacitance of the capacitor C1 is constant. In reality, while the surface polishing is performed, the polishing tool 40 is rotating and its position fluctuates little by little, and the capacitance of the capacitor C1 fluctuates finely. Therefore, the potentials of the connecting portions 13 and 27 (the potentials of the cylindrical electrodes 11) fluctuate finely, and the signal output by the voltage detection circuit 30 also fluctuates finely. The low-pass filter 31 is a circuit that removes this fine variation from the input signal and outputs it to the comparison circuit 32.

The comparison circuit 32 does not output a signal when the strength of the input signal is lower than the set strength, and outputs a signal to the ON-OFF circuit 21 and the buzzer 33 when the strength of the input signal becomes higher than the set strength. .. The strength set in the comparison circuit 32 is an appropriate strength slightly larger than 0, and in the strength of the signal input when the switch SW is in the ON state (the polishing tool 40 and the material of the bolt Bt are in contact with each other). , Less than the smallest expected strength. As a result, when the polishing tool 40 comes into contact with the material of the bolt Bt, a signal is input to the ON-OFF circuit 21 and the buzzer 33. As described above, the ON-OFF circuit 21 outputs a stop signal when a signal is input from the comparison circuit 32, whereby the pulse train signal oscillation circuit 22, the constant current output circuit 23, and the constant current output circuit 24 stop operating. The connection portions 13 and 14 have no potential, and the signal strength output by the voltage detection circuit 30 becomes zero. As a result, the strength of the signal input to the comparison circuit 32 becomes equal to or lower than the set strength, and the comparison circuit 32 does not output the signal. That is, when the materials of the polishing tool 40 and the bolt Bt change from the non-contact state to the contact state, the comparison circuit 32 outputs a signal for a moment, which is a single pulse signal.

The buzzer 33 is a device that generates a buzzer sound for a set time when a signal is input from the comparison circuit 32. After starting the surface polishing, the operator can know that the polishing tool 40 and the material of the bolt Bt are in contact with each other by listening to this buzzer sound.

As can be understood from the above description, in the characteristic detection device 2 of the above embodiment, the capacitor C1 formed from the cylindrical electrode 11 of the first electrode portion and the polishing tool 40 inserted into the through hole 12a, and the second From the pulse train signal oscillation circuit 22, the constant current output circuits 23, 24, and the switch circuits 25, 26, which repeatedly charge and discharge the flat plate electrode 15 of the electrode portion and the capacitor C2 formed from the object to be polished at a set cycle. In this charging / discharging circuit, an equal amount of charge is transferred between the ground and the cylindrical electrode 11 of the first electrode portion and between the ground and the flat plate electrode 15 of the second electrode portion during charging. A strength detection circuit including a voltage detection circuit 30 for detecting the strength of the voltage between the ground and the cylindrical electrode 11 and a low-pass filter 31 when charging and discharging are repeatedly performed by the charge / discharge circuit. And have.

According to this, the potential of the cylindrical electrode 11 changes greatly depending on the conduction state (switch SW ON / OFF) between the polishing tool 40 and the polishing object regardless of whether or not the polishing object is grounded. Further, regardless of whether or not the polishing object is grounded, when the polishing tool 40 and the polishing object are electrically connected, the charge amounts of the respective capacitors C1 and C2 at the time of charging and discharging are equal and substantially constant. Therefore, the potential of the cylindrical electrode 11 becomes substantially constant. Therefore, if the strength detection circuit detects the strength of the voltage between the ground and the cylindrical electrode 11, the detected strength can be compared with the preset strength to accurately conduct the polishing tool 40 and the object to be polished. Can be detected. Further, since the charge / discharge circuit can be configured by using a DC power supply, the characteristic detection device 2 can be made to use a battery, the characteristic detection device 2 can be made compact, and the location of the object to be polished is not limited. can do.

(Modification example 1)
As described above, various types of device can be considered as the characteristic detection device, but the configuration diagram of FIG. 6 is another embodiment capable of accurately detecting the continuity between the polishing tool 40 and the object to be polished. It is a figure which showed the characteristic detection apparatus 2'of. Since this characteristic detection device 2'has the same parts as the above-mentioned characteristic detection device 2, the same parts are given the same numbers and different parts are given different numbers in FIG. The connection portions 27, 28, the switch 20, and the ON-OFF circuit 21 of the characteristic detection device 2'are the same as those of the characteristic detection device 2 described above.

In the characteristic detection device 2', a bridge circuit using a capacitor and a resistor is formed, and by detecting the timing when the voltage or current intensity of the bridge between the parallel circuits of the bridge circuit changes significantly, it is used for surface polishing. The timing at which the capacitance between the connection portions 13 and 14 of the jig 1 changes significantly (the timing at which the switch SW is turned from OFF to ON) is detected. Assuming that the capacitor between the connection portions 13 and 14, that is, the capacitor composed of the capacitor C1, the switch SW and the capacitor C2 in FIG. 3 is the capacitor Cj, the bridge circuit is a parallel circuit of the capacitor Cj and the resistor R1 and the capacitor C3 and the resistor R2. Consists of. The AC voltage output circuit 34 outputs an AC voltage of a set intensity to the parallel circuit when an operation signal is input from the ON-OFF circuit 21.

The capacitance of the capacitor C3 is set to a considerably small value, and the resistances of the resistors R1 and R2 are equal to each other, which is sufficiently smaller than the resistance of the capacitor C3 to the alternating current. If the polishing tool 40 and the object to be polished are in a non-conducting state (switch SW is in the OFF state), the capacitance of the capacitor Cj is approximately 0, and the resistance to the AC current becomes a considerably large value, so that an AC voltage is applied. When a sufficiently large resistor is inserted at the bridge between the parallel circuits, the voltage across the bridge becomes a strength close to zero. Further, when the bridging portion is made conductive as it is, the current flowing through the bridging portion has a strength close to zero. When the polishing tool 40 and the object to be polished are in a conductive state (switch SW is ON), the resistance of the capacitor Cj to the alternating current becomes a value sufficiently smaller than the resistance of the capacitor C3 to the alternating current, so that the distance between the parallel circuits is sufficiently smaller. The above-mentioned voltage or current at the bridging point has a large intensity. Therefore, in the voltage or current of the bridge between the parallel circuits when the polishing tool 40 and the object to be polished are in a conductive state, a voltage or current having an appropriate intensity smaller than the lowest expected voltage or current intensity is set as a set value. If it is determined that the voltage or current at the bridge between the parallel circuits becomes larger than this set value, the contact between the polishing tool 40 and the material of the bolt Bt can be detected. The circuits and devices after the detection circuit 35 are circuits and devices for this detection.

The detection circuit 35 has a sufficiently large resistance inside, and outputs a signal corresponding to an envelope (envelope) in the voltage at both ends of the bridge between the parallel circuits. In other words, since an AC voltage is applied to the bridge circuit, the voltage across the bridge is a voltage that vibrates with respect to the time axis, and the detection circuit 35 outputs a signal with a strength corresponding to the amplitude intensity of this vibration. do. Instead of this, the detection circuit 35 may conduct the bridging portion as it is and output a signal corresponding to an envelope (envelope) in the current flowing through the bridging portion. The comparison circuit 37 is the same as the comparison circuit 32 of the characteristic detection device 2, and does not output a signal when the strength of the input signal is less than the set strength, and when the strength of the input signal becomes greater than the set strength, the signal is signaled. Is output to the ON-OFF circuit 21 and the buzzer 33. The ON-OFF circuit 21 outputs a stop signal when a signal is input from the comparison circuit 37, and the AC voltage output circuit 34 stops the voltage output, so that the strength of the signal output by the detection circuit 35 becomes zero. Therefore, even in the characteristic detection device 2', the comparison circuit 37 outputs a signal for a moment, and is a single pulse signal. The buzzer 33 is the same as that of the characteristic detection device 2, and the operator can know that the polishing tool 40 and the material of the bolt Bt are in contact with each other by listening to the buzzer sound.

As can be understood from the above description, in the characteristic detection device 2'of the above embodiment, the capacitor and the second electrode formed from the cylindrical electrode 11 of the first electrode portion and the polishing tool 40 inserted into the through hole 12a. A bridge composed of a capacitor C3 having a resistance in an alternating current, a resistor R1, a resistor R2, and an alternating current voltage output circuit 34, with the flat plate electrode 15 and the capacitor formed from the object to be polished as one of the capacitors in the circuit. It includes a circuit and a detection circuit 35 that detects the strength of a voltage or current that bridges between parallel circuits of the bridge circuit when the AC voltage output circuit 34 of the bridge circuit applies an AC voltage.

According to this, regardless of whether the polishing object is grounded or not, the location where the parallel circuit of the bridge circuit is bridged by the conduction state (switch SW ON / OFF) between the polishing tool 40 and the polishing object. The intensity of the voltage or current of is greatly fluctuated. Therefore, if the strength of the voltage or current is detected by the detection circuit 35 and the detected strength is compared with the preset strength, the continuity between the polishing tool 40 and the object to be polished can be detected accurately. ..

(Modification 2)
In the surface polishing by the characteristic detection device 2 and the characteristic detection device 2'described above, the operator knows that the polishing tool 40 and the material of the bolt Bt are in contact with each other due to the buzzer sound generated by the buzzer 33, and the surface is manually polished. The operation of the polishing device 4 is stopped, but instead of this, the operation of the surface polishing device 4 may be automatically stopped when the polishing tool 40 and the material of the bolt Bt come into contact with each other. The surface polishing device 4 shown in FIG. 7 enables the signal from the characteristic detection device 2 to be input, and when the polishing tool 40 and the material of the bolt Bt are in contact with each other, the surface is subjected to the signal input from the characteristic detection device 2. The operation of the polishing device 4 is stopped. Although the characteristic detection device 2 is used in FIG. 7, the description is the same for the characteristic detection device 2'.

The characteristic detection device 2 shown in FIG. 7 is provided with a terminal for outputting the signal of the comparison circuit 32. By connecting this terminal and the surface polishing device 4 with a cable, the signal of the comparison circuit 32 is buzzed. Instead of outputting to 33, it is output to the surface polishing device 4. The surface polishing device 4 also has a terminal for inputting a signal from the characteristic detection device 2, and the operator sets the surface polishing jig 1 on the object to be polished and then sets the surface polishing jig 1. 1 and the characteristic detection device 2 are connected by a cable, and further, the characteristic detection device 2 and the surface polishing device 4 are connected by a cable.

The surface polishing device 4 shown in FIG. 7 outputs a signal to the ON-OFF circuit 47 each time the switch 49 is pressed, and the ON-OFF circuit 47 outputs an operation signal and a stop signal in order each time the signal is input. .. Further, the ON-OFF circuit 47 outputs a stop signal when a signal from the comparison circuit 32 of the characteristic detection device 2 is input. The operation signal and stop signal of the ON-OFF circuit 47 are input to the rotation drive circuit 48, and when the operation signal is input, the rotation drive circuit 48 outputs a drive signal for rotationally driving the polishing tool 40, and the stop signal is generated. When input, the output of the drive signal is stopped. As a result, when the switch 49 is pressed, the polishing tool 40 is rotationally driven, and as described above, the polishing tool 40 and the material of the bolt Bt are in contact with each other, and when the comparison circuit 32 outputs a signal, the polishing tool 40 is rotated. The drive stops.

As can be understood from the above description, the surface polishing device 4 of the above embodiment makes it possible to input a signal output by the characteristic detection device 2 and rotationally drives the polishing tool 40 to be inserted into the through hole 12a of the first electrode portion. It includes a rotation drive circuit 48 and an ON-OFF circuit 47 that controls the operation and stop of the rotation drive circuit 48 by a signal based on the characteristics input from the characteristic detection device 2.

According to this, if the ON-OFF circuit 47 detects the continuity between the polishing tool 40 and the object to be polished by the signal based on the characteristic output by the characteristic detection device 2, and stops the rotation drive circuit 48, the work is performed. Since the person only has to operate the surface polishing device 4 to concentrate on polishing the object to be polished, the efficiency of the polishing work is improved.

The implementation of the present invention is not limited to the above-described embodiments and modifications, and various modifications can be made as long as the object of the present invention is not deviated.

In the embodiment in which the operation of the surface polishing device 4 is automatically stopped by a signal from the characteristic detection device 2, which is a modification of the above embodiment, a signal is sent from the comparison circuit 32 at the timing when the polishing tool 40 and the object to be polished are electrically connected. Is output. However, any signal can be detected as long as it is a signal based on the characteristics of a circuit consisting of the cylindrical electrode 11 of the first electrode portion, the polishing tool 40, the object to be polished, and the flat plate electrode 15 of the second electrode portion. The device 2 may output to the surface polishing device 4. For example, the signal output by the low-pass filter 31 is output to the surface polishing device 4, the same circuit as the comparison circuit 32 of the above embodiment is provided in the surface polishing device 4, and the signal is output from the circuit to the ON-OFF circuit 47. You may try to do it.

Further, in the embodiment in which the operation of the surface polishing device 4 is automatically stopped by a signal from the characteristic detecting device 2, which is a modification of the above embodiment, the characteristic detecting device 2 and the surface polishing device 4 are connected by a cable. However, instead of this, the characteristic detection device 2 itself may be provided inside the surface polishing device 4. According to this, since it is only necessary to connect between the surface polishing jig 1 and the surface polishing device 4 before performing the surface polishing work, the work efficiency is improved.

Further, in the characteristic detection devices 2 and 2'in the above-described embodiment and the modified example, the operator is made to know the contact between the polishing tool 40 and the material of the bolt Bt by the buzzer sound of the buzzer 33. However, if the operator can know the contact between the polishing tool 40 and the material of the bolt Bt, a means other than the buzzer sound may be used. For example, it may be based on the light emission of a lamp or the pointer of a meter. Moreover, you may combine some means.

Further, in the characteristic detection device 2 in the above embodiment, the potential (voltage between the ground and the cylindrical electrode 11) of the cylindrical electrode 11 of the first electrode portion is detected, but the polishing tool 40 and the bolt Bt are used. If the property changes when the material comes into contact with the material, another property may be detected. For example, the cylindrical electrode 11 of the first electrode portion and the ground may be connected via a resistor to detect the current flowing between the cylindrical electrode 11 and the ground.

Further, in the characteristic detection device 2 in the above embodiment, the potential (earth) of the cylindrical electrode 11 of the first electrode portion is brought into contact with the polishing tool 40 and the material of the bolt Bt by using the circuit of the switched capacitor. And the voltage between the cylindrical electrodes 11) are detected to change significantly. Further, in the characteristic detection device 2'in the modified example, the polishing tool 40 and the material of the bolt Bt are brought into contact with each other by using the bridge circuit, so that the voltage or current at the portion bridging between the parallel circuits of the bridge circuit becomes large. Changed to detect change. However, if the location of the object to be polished is limited and the frequency of carrying the characteristic detection device is low, a characteristic detection device other than the device shown in the above-described embodiment and modification may be used. For example, a device of a method of detecting the intensity of the current flowing between the connecting portions 13 and 14 when an AC voltage is applied between the connecting portions 13 and 14 may be used.

Further, in the surface polishing jig 1 in the above embodiment, the recess 10a that fits into the head of the bolt Bt has a cylindrical shape, but if it fits into the head of the bolt Bt, it is replaced with a prism. It may be shaped. Further, the surface polishing jig 1 in the above embodiment is provided with the recess 10a so that the head of the bolt Bt can be polished and the plate Pt, which is a flat plate, can be polished. If is limited to a flat plate, the recess 10a may not be provided.

Further, in the surface polishing jig 1 in the above embodiment, the flat plate electrode 15 of the second electrode portion is entirely a magnet. However, when the surface polishing jig 1 is set on the object to be polished and the polishing tool 40 is inserted into the through hole 12a to perform surface polishing, the attractive force of the magnet to the object to be polished is increased by the surface polishing jig 1. As long as it does not move, a part of the flat plate electrode 15 may be a magnet, or a magnet may be provided in the vicinity of the flat plate electrode 15. The second electrode portion having the magnet portion described in the claims includes the case where the magnet is provided in the vicinity of the flat plate electrode 15.

Further, in the surface polishing jig 1 in the above embodiment, the main body 10 is formed into a cylindrical shape, but when the main body 10 is set in the object to be polished and the polishing tool 40 is inserted into the through hole 12a, the cylinder of the first electrode portion is formed. The shape may be any shape as long as a circuit can be formed in which the shape electrode 11, the polishing tool 40, the object to be polished, and the flat plate electrode 15 of the second electrode portion are formed in this order. For example, it may be a rectangular parallelepiped shape or a hexagonal prism shape.

Further, in the surface polishing jig 1 in the above embodiment, the material of the main body 10 is made of resin (plastic), but if the material is high in insulation, lightweight and easy to carry, a material other than resin may be used. good. For example, rubber or earthenware may be used.

1 ... Surface polishing jig, 2, 2'... Characteristic detection device, 4 ... Surface polishing device, 10 ... Main body, 10a ... Recess, 10b ... Bottom surface, 10c, 10d ... Through hole, 10e ... Side surface, 10f ... Penetration Holes, 11 ... Cylindrical electrodes, 12 ... Cylindrical insulators, 12a ... Through holes, 13, 14 ... Connections, 13a, 14a ... Inserts, 15 ... Flat plate electrodes, 16, 17 ... Leads, 18, 19 ... Sealing material, 25, 26 ... Switch circuit, 27, 28 ... Connection part, 29 ... Earth terminal, 40 ... Polishing tool, 41 ... Fixed part, 41a ... Flange, 42 ... Screw, 43 ... Insulator, 44 ... Flange part , 45 ... Rotating shaft, Bt ... Bolt, Pt ... Plate

Claims (5)

A cylindrical insulator is arranged inside the cylindrical electrode, and the inside of the cylindrical insulator is a first electrode portion which is a through hole through which a polishing tool can pass.
A second electrode part that has a magnet part and has an insulating layer to bring the electrode into contact with the object to be polished and fix it.
When the polishing tool is inserted into the through hole of the first electrode portion, the characteristics of the circuit consisting of the electrode of the first electrode portion, the polishing tool, the object to be polished, and the electrode of the second electrode portion in this order. A jig for surface polishing, characterized in that the characteristic detection device for detecting In the surface polishing jig according to claim 1,
When the concave portion has a cylindrical shape or a prismatic shape with the central axis of the through hole of the first electrode portion as a substantially central axis and the object to be polished is the head of a bolt tightened to the plate, the head. A surface polishing jig characterized by having a recess sized to fit with. In the characteristic detection device connected to the connection portion of the surface polishing jig according to claim 1 or 2.
Charging and discharging were set for the capacitor formed from the electrode of the first electrode portion and the polishing tool inserted into the through hole, and the capacitor formed from the electrode of the second electrode portion and the object to be polished. It is a charge / discharge circuit that repeats in a cycle so that an equal amount of charge moves between the ground and the electrode of the first electrode portion and between the ground and the electrode of the second electrode portion during charging. Charge / discharge circuit and
A characteristic detection device including a strength detection circuit that detects the intensity of voltage or current at a predetermined position of the charge / discharge circuit when charging and discharging are repeatedly performed by the charge / discharge circuit. In the characteristic detection device connected to the connection portion of the surface polishing jig according to claim 1 or 2.
A capacitor formed from the electrode of the first electrode portion and the polishing tool inserted into the through hole, and a capacitor formed from the electrode of the second electrode portion and the object to be polished are used as one of the capacitors in the circuit. A bridge circuit consisting of an element having resistance in AC current and an AC power supply,
A characteristic detection device including a strength detection circuit that detects the strength of a voltage or current at a portion bridging between parallel circuits of the bridge circuit when the AC power supply of the bridge circuit applies an AC voltage. In a surface polishing apparatus capable of inputting a signal based on the characteristics output by the characteristic detecting apparatus connected to the connection portion of the surface polishing jig according to claim 1 or 2.
A driving means for rotationally driving the polishing tool to be inserted into the through hole of the first electrode portion, and
A surface polishing apparatus comprising: a control means for controlling operation and stop of the drive means by a signal based on a characteristic input from the characteristic detection device.

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