JPH0740065U - Electrolytic compound polishing tool - Google Patents

Abstract

(57) [Summary] [Purpose] For electrolytic composite polishing, which can be applied mainly to forming for flatness processing, and the distance between the grindstone and the electrode does not change much, and adjustment is easy even if it changes. Providing tools. [Structure] Non-conductive cylindrical grindstone, electrodes concentrically inserted outside the grindstone, and the positions of the polishing surface of the workpiece facing the lower end surface of the grindstone and the electrode lower end surface are variably adjusted. In addition, it consists of a coupling member that fastens the grindstone and the electrode, a rotary shaft that connects the grindstone and the electrode to rotate it, a polishing surface of the work piece, and a power supply that applies a voltage to the rotary shaft. The base, the fitting member for synchronously fitting the grindstone and the electrode that are fastened and integrated to the base, and the electrode for the base provided in the through hole provided in the axial direction of the base. It has a rotating member composed of a biasing spring-like body and a rotating shaft, and a rotary joint is provided on the rotating shaft so that the electrolytic solution is supplied from the hole formed in the shaft center toward the center of the grindstone. The electrolytic composite polishing tool is characterized by the following.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to electrolytic composite polishing that combines mechanical polishing with a grindstone and electrolytic processing.

[0002]

[Prior art]

 In complex electropolishing, a conductor is electrolytically processed by elution by an electric current after mechanical polishing.In this method, depending on the electrolytic solution used, a conductor type (for example, sodium chloride) and a nonconductor type (for example, sodium nitrate) are used. ), It is possible to elute a large amount of the workpiece, but it is difficult to control the elution amount and the processed shape accuracy is poor. In the latter case, electrolytic elution starts after mechanical polishing, and a strong tendency to form a non-conductive film on the surface and suppress elution due to electric current makes it easy to maintain the machining locus of the workpiece and obtain high shape accuracy.

Therefore, a non-conductive type electrolytic solution is generally used for precision machining. At this time, because the grindstone is used for electrolytic composite polishing, because of the relationship with the electrode, for example, even if an electrode is provided on the opposite side of the work piece of the grindstone, the grindstone is non-conductive and no current flows. A porous material that has conductivity by pouring an electrolytic solution into it, for example, a non-woven fabric made of nylon fiber with abrasive grains attached, or a free abrasive method in which abrasive particles are dispersed in the electrolytic solution is used. As in JP 61-219525 A, a sponge-like porous body such as urethane foam is used, and an electrolytic solution containing abrasive grains is passed through the porous body, and the electrolytic buff polishing method of JP-A 52-149697. As described above, a plurality of grindstones are formed in a strip shape in the longitudinal direction on the circumference of the cylinder and electrodes are used between the grindstones.

[0004]

[Problems to be solved by the device]

 However, the non-woven fabric of nylon fiber with abrasive grains attached, or the sponge-like porous body in which the electrolytic solution containing abrasive grains is passed through, has both viscoelasticity and extremely weak rigidity. Therefore, although it is possible to improve the surface roughness along the curved surface of the work piece, it is unsuitable for processing mainly for forming flatness, and there are multiple strips in the longitudinal direction around the cylinder. If a grindstone is formed with electrodes between the grindstones, it can be surface-polished, but the height difference between the grindstone and the electrode changes in increments due to the removal of abrasive grains due to polishing or dressing. Is not suitable for.

The present invention has been made in view of the above problems, and can be applied to processing mainly for forming for flatness processing, and the distance between the grindstone and the electrode does not change so much. Even so, it is an object of the present invention to provide an electrolytic composite polishing tool that can be easily adjusted.

[0006]

[Means for Solving the Problems]

 In order to solve the above-mentioned object, the present invention provides a non-conductive cylindrical grindstone, an electrode concentrically inserted outside the grindstone, a polishing surface of a workpiece facing the lower end surface of the grindstone, and an electrode lower electrode. A coupling member that variably adjusts the position of the end face and that fastens the grindstone to the electrode, a rotating shaft that connects the grindstone and the electrode and rotates this, and a power supply that applies a voltage to the polishing surface of the workpiece and the rotating shaft. And a fitting member that fits the grindstone and the electrode, which are fastened and integrated, to the rotating shaft at the same time, and a spring-like member that is provided in the through hole provided in the axial direction and urges the electrode. It has a rotating member composed of a body and a rotating body, and a rotary joint is provided on the rotating shaft to supply the electrolytic solution toward the center of the grindstone through a hole opened in the shaft center. A tool for electrolytic composite polishing was used.

[0007]

[Action]

 A grindstone is applied to the polished surface of the work piece, and an electric voltage is applied between the rotary shaft and the polished surface of the work piece. In this state, the electrode and the grindstone are rotated together with the rotating shaft, and the electrolytic solution is supplied from the rotary joint.

A polishing surface is mechanically polished by a rotating grindstone, and then electrolytic processing is performed to obtain high accuracy and high processing efficiency of the polishing surface while maintaining the processing locus obtained by mechanical polishing.

[0009]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. The electrolytic composite tool 10 of the first embodiment shown in the cross-sectional view in FIG. 1 has a cylindrical integral grindstone 1 having a plurality of liquid discharge grooves 30 on the lower surface, and this grindstone 1 is on the lower surface in the drawing. It has a gap 31 that is in contact with the work piece 5 on the lower side, is parallel to the cup-shaped electrode 2 that covers the entire grindstone 1 on the upper surface, and is in contact with the electrode 2 on the side surface. The grindstone 1 and the electrode 2 have the same center, and the communication hole 9 penetrating the central portion of the grindstone 1 continues to the gap 31 of the electrode 2.

The gap 31 is connected to the upper surface of the electrode 2 and communicates with a communication hole 6 formed inside the shaft 4 for rotating the electrode 2 and the grindstone 1. The communication hole 6 supplies the electrolytic solution from the outside. It is connected to the rotary joint 7 for working. A negative voltage is applied to the electrode 2 from a separately arranged variable voltage power source 8 through the shaft 4, and an electrolysis is formed between the electrode 2 and the workpiece 5 to which a positive voltage electrode is applied.

In this embodiment having such a configuration, the clearance between the work piece 5 and the electrode 2 is adjusted to be t as shown in the figure, and the set screw 3 for fixing the grindstone 1 and the electrode 2 is fastened. Then, the electrolytic composite polishing described below becomes possible. The grindstone 1 is applied to the surface of the workpiece 5, and a voltage is applied between the shaft 4 and the workpiece 5. In this state, the electrode 2 and the grindstone 1 are rotated together with the shaft 4, and the non-conductive type electrolytic solution (sodium nitrate) is supplied from the rotary joint 7 and the communication hole 6.

The workpiece 5 is mechanically polished by the rotating grindstone 1, the non-conductive film on the surface thereof is removed, and electrolysis begins to elute into the electrolytic solution by electrolysis, but a non-conductive film is formed with time, and electrolytic outflow occurs. Is suppressed. Therefore, it is possible to obtain high shape accuracy and high processing efficiency of the work piece while maintaining the processing locus obtained by mechanical polishing. The electrolytic solution is discharged through a plurality of radially arranged passages 30. In this case, a sufficient liquid flow rate is required to fill the gap t, and the gap t between the workpiece 5 and the electrode 2 is required. Electrolytic elution is performed.

FIG. 2 shows a second embodiment of the electrolytic composite tool 22 of the present invention. Unlike the first embodiment, the electrolytic composite tool 22 has a cylindrical grindstone 11 having no passage 30 on its lower surface. The grindstone 11 is in contact with the work piece 15 on the lower side in the drawing on the lower surface and is in contact with the electrode 12 on the side surface. A flange portion 21 is provided on the lower portion of the electrode 12, and a pin 17 is tightly fitted to the flange portion 21. The pin 17 covers the upper surface of the grindstone 11 and the electrode 12 and is a base as a cup-shaped rotating body. Since it loosely fits into the hole provided at the lower end of 16, the electrode 12, grindstone 11, and base 16 rotate simultaneously by rotating the shaft 14 coupled to the upper surface of the base 16. Is possible.

A plurality of tap holes 23 that penetrate the base 16 are opened from the upper end of the base 16, and the plunger 18 is screwed into the tap holes 23. The flange portion 21 of the electrode 12 is biased. Therefore, even if the shaft 14 is not necessarily perpendicular to the surface of the work piece 15, the stroke of the plunger 18 allows the work piece to be machined following the surface of the work piece.

The built-in spring of the plunger 18 is also effective as a buffer when the grindstone 11 comes into contact with the workpiece 15. Further, a plurality of screws 19 penetrating the upper end of the base 16 and screwed into the electrode 12 located therebelow are coupled to the base 16 with a gap so that the electrode 12 does not come off from the base 16. .

The screw 20 provided on the upper end of the base 16 is for transmitting the current supplied from the power source 24 from the base 16 to the electrode 12 via the screw 19 via the shaft 14. Also in the configuration of FIG. 2, the electrolytic solution may be supplied from the outside of the electrode, or may be supplied from the rotary joint to the communication hole 29 of the grindstone 11 as shown in FIG. 1, but in the latter case, the grindstone is used. A passage as shown in FIG. 1 is required on the polished surface side of the work piece 11 to be processed.

In the second embodiment configured as described above, the set screw 13 for fixing the grindstone 1 and the electrode 2 is adjusted by adjusting the gap between the workpiece 15 and the electrode 12 to be t as shown in the figure. By fastening, the electrolytic composite polishing described below becomes possible. The grindstone 11 is applied to the surface of the workpiece 15, and a voltage is applied between the shaft 14 and the workpiece 15.

In this state, the base 16, the electrode 12 and the grindstone 11 are rotated together with the shaft 14, and at the same time, the non-conductor is placed in the gap between the workpiece 15 and the electrode 12 from the outside of the electrolysis compound tool 22. Supply type electrolyte (sodium nitrate). The workpiece 15 is mechanically polished by the rotating grindstone 11, the non-conductive film on the surface is removed, and electrolysis starts electrolytic elution into the electrolytic solution, but with time, the non-conductive film comes out and electrolytic outflow is suppressed. To be For this reason, it is possible to obtain high shape accuracy and high processing efficiency of the workpiece while maintaining the processing locus obtained by mechanical polishing. The electrolytic solution that has undergone electrolytic processing is discharged to the outside through a passage (not shown).

In this embodiment, since the spring in the plunger 18 urges the flange portion 21 of the electrode 12 into the tap hole 23, the shaft 14 is always in contact with the surface of the workpiece 15. Even if it is not vertical, it can be processed by the stroke of the plunger 18 following the surface of the work piece, and the spring in the plunger 18 is also effective as a buffer when the grindstone 11 contacts the work piece 15. is there.

In the first and second embodiments, since the grindstone and the electrode are separated from each other, it is easy to configure, and since the elution action can be superposed by the electric current, for example, in the case of polishing chromium, when only the grindstone is used, 3 to 4 is used. Although a pressing force of the kilogram force level was required, the grindstone had the same processing effect with a 1 kilogram force and a current of 1A, and a hard and brittle object such as chrome has a reduced load, resulting in an edge effect. There is even the effect of reducing the number of chips that are easily broken, such as parts.

[0021]

[Effect of device]

 The present invention can separate mechanical grinding and electrolytic processing by separating the grindstone and the electrode, and can be applied to machining mainly for flatness machining, and the grindstone can be integrated into one piece. As a result, the grindstone was not divided into minute abrasives, and the falling of the abrasive grains was extremely small, and it was possible to provide a polishing tool for electrolytic compounding that did not change the distance between the grindstone and the electrode.

[Submission date] December 16, 1994

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0002

[Correction method] Change

[Correction content]

[0002]

[Prior art]

In complex electropolishing, a conductor is electrolytically machined by an elution action by an electric current after mechanical polishing.In this method, depending on the electrolytic solution used, a passive type (eg sodium chloride) and a passive type (eg sodium nitrate) are used. ), It is possible to elute a large amount of the workpiece, but it is difficult to control the elution amount and the processed shape accuracy is poor. In the latter case, electrolytic elution begins after mechanical polishing, and a passive film is formed on the surface of the latter, which tends to suppress elution due to electric current, so that the machining locus of the workpiece can be easily maintained and high shape accuracy can be obtained.

[Procedure 3]

[Document name to be amended] Statement

[Name of item to be corrected] 0003

[Correction method] Change

[Correction content]

For this reason, a passive type electrolytic solution is generally used for precision machining. At this time, because the grindstone is used for electrolytic composite polishing, because of the relationship with the electrode, for example, even if an electrode is provided on the opposite side of the work piece of the grindstone, the grindstone is non-conductive and no current flows. A porous material that has conductivity by pouring an electrolytic solution into it, for example, a non-woven fabric made of nylon fiber with abrasive grains attached, or a free abrasive method in which abrasive particles are dispersed in the electrolytic solution is used. As in JP 61-219525 A, a sponge-like porous body such as urethane foam is used, and an electrolytic solution containing abrasive grains is passed through the porous body, and the electrolytic buff polishing method of JP-A 52-149697. As described above, a plurality of grindstones are formed in a strip shape in the longitudinal direction on the circumference of the cylinder and electrodes are used between the grindstones.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction content]

[0006]

[Means for Solving the Problems]

In order to solve the above-mentioned object, the present invention provides a non-conductive cylindrical grindstone, an electrode concentrically inserted outside the grindstone, a polishing surface of a workpiece facing the lower end surface of the grindstone, and an electrode lower electrode. A coupling member that variably adjusts the position of the end face and that fastens the grindstone to the electrode, a rotating shaft that connects the grindstone and the electrode and rotates this, and a power supply that applies a voltage to the polishing surface of the workpiece and the rotating shaft. consists of a and a base that is fastened to the rotary shaft, and a fitting member relative to the base and the grinding wheel and the electrode integrally fastened to be capable of fitting synchronization, penetrations provided in the axial direction of the base It has a rotating member that is composed of a rotating shaft and a spring-like body that is installed in the hole and biases the electrode against the base , and the rotary joint is provided on the rotating shaft. The electrolytic composite polishing tool is characterized in that the electrolytic solution is supplied to the portion.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction content]

[0009]

【Example】

Embodiments of the present invention will be described below with reference to the drawings. The electrolytic composite polishing tool 10 of the first embodiment shown in the cross-sectional view in FIG. 1 has a cylindrical monolithic grindstone 1 having a plurality of liquid discharge grooves 30 on its lower surface. It has a gap 31 parallel to the cup-shaped electrode 2 that covers the entire grindstone 1 on the upper surface in contact with the workpiece 5 on the lower side in the figure, and contacts the electrode 2 on the side surface. The grindstone 1 and the electrode 2 have the same center, and the communication hole 9 penetrating the central portion of the grindstone 1 continues to the gap 31 of the electrode 2.

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction content]

In this embodiment having the above-described structure, the gap between the workpiece 5 and the electrode 2 is adjusted to be t as shown in the figure, and the set screw 3 for fixing the grindstone 1 and the electrode 2 is fastened. Then, the electrolytic composite polishing described below becomes possible. The grindstone 1 is applied to the surface of the workpiece 5, and a voltage is applied between the shaft 4 and the workpiece 5. In this state, the electrode 2 and the grindstone 1 are rotated together with the shaft 4, and a passive type electrolytic solution (sodium nitrate) is supplied from the rotary joint 7 and the communication hole 6.

[Procedure Amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction content]

[0012] The grinding wheel 1 is rotated, the workpiece 5 is mechanically polished, but the passive film on the surface is removed electrolytic dissolution begins in the electrolyte solution by electrolysis, passivation film can over time, electrolyte outflow Is suppressed. Therefore, it is possible to obtain high shape accuracy and high processing efficiency of the work piece while maintaining the processing locus obtained by mechanical polishing. The electrolytic solution is discharged through a plurality of radially arranged passages 30. In this case, a sufficient liquid flow rate is required to fill the gap t, and the gap t between the workpiece 5 and the electrode 2 is required. Electrolytic elution is performed.

[Procedure Amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction content]

[0013] Figure 2 shows a second embodiment of a composite electrolytic polishing tool 22 of the present invention, electrolytic composite polishing tool 22 is different from the first embodiment, the cylindrical grinding wheel 11 having no passage 30 to the lower surface This grindstone 11 has a lower surface in contact with the workpiece 15 on the lower side in the drawing and a side surface in contact with the electrode 12. A flange portion 21 is provided on the lower portion of the electrode 12, and a pin 17 is tightly fitted to the flange portion 21. The pin 17 covers the upper surface of the grindstone 11 and the electrode 12 and is a base as a cup-shaped rotating body. Since it loosely fits into the hole provided at the lower end of 16, the electrode 12, grindstone 11, and base 16 rotate simultaneously by rotating the shaft 14 coupled to the upper surface of the base 16. Is possible.

[Procedure Amendment 9]

[Document name to be amended] Statement

[Correction target item name] 0018

[Correction method] Change

[Correction content]

In this state, the base 16, the electrode 12 and the grindstone 11 are rotated together with the shaft 14, and at the same time, the passive state is maintained in the gap between the workpiece 15 and the electrode 12 from the outside of the electrolytic polishing tool 22. Supply type electrolyte (sodium nitrate). The grinding wheel 11 is rotated, the workpiece 15 is mechanically polished, but electrolytic dissolution in the electrolyte solution by the passivation film is removed electrolysis of the surface begins, passivation film come out with time, pressing the electrolyte outflow To be For this reason, it is possible to obtain high shape accuracy and high processing efficiency of the workpiece while maintaining the processing locus obtained by mechanical polishing. The electrolytic solution that has undergone electrolytic processing is discharged to the outside through a passage (not shown).

[Procedure Amendment 10]

[Document name to be amended] Statement

[Correction target item name] 0021

[Correction method] Change

[Correction content]

[0021]

[Effect of device]

The present invention can separate mechanical grinding and electrolytic processing by separating the grindstone and the electrode, and can be applied to machining mainly for flatness machining, and the grindstone can be integrated into one piece. As a result, the grindstone was not divided into minute abrasives, and the falling of the abrasive grains was extremely reduced, and it was possible to provide a polishing tool for electrolytic composite polishing that did not change the distance between the grindstone and the electrode.

[Brief description of drawings]

FIG. 1 is a diagram showing a first embodiment of the present invention.

FIG. 2 is a diagram showing a second embodiment of the present invention.

[Explanation of symbols]

 1 Grindstone 2 Electrode 4 Axis 5 Workpiece 7 Rotary Joint 8 Variable Voltage Power Supply 10 Electrolytic Compound Tool 11 Grindstone 12 Electrode 15 Workpiece 16 Base 17 Pin 18 Plunger

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[Procedure amendment]

[Submission date] December 16, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Scope of utility model registration request

[Correction method] Change

[Correction content]

[Scope of utility model registration request]

[Procedure Amendment 11]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a diagram showing a first embodiment of the present invention.

FIG. 2 is a diagram showing a second embodiment of the present invention.

[Explanation of symbols] 1 grindstone 2 electrode 4 axis 5 work piece 7 rotary joint 8 variable voltage power supply 10 electrolytic composite polishing tool 11 grindstone 12 electrode 15 work piece 16 base 17 pin 18 plunger

Claims (3)

[Scope of utility model registration request] 1. A non-conductive cylindrical grindstone, an electrode concentrically provided outside the grindstone, and a position of a polishing surface of a workpiece facing the lower end surface of the grindstone and an electrode lower end surface are variable. For electro-composite polishing, which consists of a coupling member that adjusts the whetstone and the electrode and fastens the electrode, a rotating shaft that connects the whetstone and the electrode and rotates this, a polishing surface of the workpiece and a power supply that applies a voltage to the rotating shaft. tool. 2. A fitting member for fitting a whetstone and an electrode, which are fastened and integrated together, to a rotating shaft in a synchronous manner, and an electrode provided in a through hole provided in an axial direction according to claim 1. An electrolytic composite polishing tool having a rotating member configured by a spring body for urging and a rotating body. 3. A rotary joint used in claims 1 and 2 is provided with a rotary joint so that an electrolytic solution is supplied toward a central portion of a grindstone through a hole formed in the shaft center. A tool for electrolytic composite polishing.