JPH05277939A - Specular machineing and its device using mounting type discharge truing/dressing and nonconductor film by electrolysis - Google Patents

Abstract

PURPOSE:To shorten preparatory time for mounting type discharge electrolytic truing or dressing and to improve machining precision by carrying out the truing/dressing of an electrically conductive grinding wheel by mounting type discharge and using the mounting type electrolysis only for generation of a nonconductor film. CONSTITUTION:An electrically conductive grinding wheel 1 is rotated as it is installed on a main spindle 2, and negative voltage is supplied from a discharge electric source 6. In the meantime, to a discharge electrode 3, positive voltage is supplied from the discharge electric source 6. Thereafter, while having the electrically conductive grinding wheel 1 approach the discharge electrode 3, processing liquid and others are jetted between them from a nozzle 7. After carrying out discharge truing/dressing in this way, the discharge electrode 3 is removed with an insulating material 4 from a work shaft 5, and a processed article 11 is installed in place of it. Additionally, and electrolytic electrode 9 is installed against the electrically conductive grinding wheel 1, and while jetting the grinding liquid and others between them from the nozzle 7, low voltage is applied from an electrolytic electric source 10. In this way, by using an electrolytic action, a nonconductor film is adhered on the electrically conductive grinding wheel 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mirror grinding method and apparatus using on-machine electric discharge truing / dressing and electrolytic non-conductive coating.

[0002]

2. Description of the Related Art Conventionally, as a method of mirror surface grinding using on-machine electric discharge dressing, as disclosed in JP-A-1-188266, a voltage is applied to a conductive grindstone to perform mirror surface grinding while performing dressing. The method of performing the processing is shown. However, in this technique, the dressing state may differ depending on the type of the binder of the grindstone, the lot, or the nature of the grinding liquid, and a mirror surface may not be obtained, resulting in variations in the surface roughness. There was also a problem that the initial dressing time was too long. As another technique, there is a method of using a resin bond grindstone or a vitrified bond grindstone.In the case of the resin bond grindstone, the surface roughness is good, but there is a problem that the flatness deteriorates, and in the case of the vitrified bond grindstone, a mirror surface is obtained. There was a problem that it was hard to be caught.

[0003]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention As described above,
Conventionally, there is no method for performing highly precise and stable processing accuracy such as surface roughness and flatness in mirror grinding, and when the processing accuracy deteriorates, it is necessary to re-true or dress the grindstone. Therefore, there are problems that it takes time to set up truing or dressing, and it is necessary to perform alignment with the work.

An object of the present invention is to provide a surface roughness by mirror grinding,
Highly precise and stable processing accuracy such as flatness
If the machining accuracy deteriorates, the grinding stone can be re-trued or dressed on the machine, no time is required for truing or dressing setup, and no alignment with the workpiece is required. It is an object of the present invention to provide a mirror grinding method and an apparatus therefor using a dressing and an electrolytic non-conductive coating.

[0005]

SUMMARY OF THE INVENTION Therefore, the present invention provides a mirror grinding method and apparatus using the on-machine electric discharge truing / dressing and the electrolytic non-conductive coating described in the claims. Solved the problems of the related art.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 (a) is a block diagram of an embodiment apparatus in which a mirror surface grinding method using the discharge truing / dressing of the present invention and an electroconductive non-conductive coating is applied to a rotary surface grinder. Reference numeral 1 is a conductive cup-shaped diamond grindstone, 2 is a main shaft which is a rotating shaft of a grinding machine for rotating the grindstone 1, and 3 is a discharge installed between a grinding machine 1 and a table (not shown) of the grinding machine to discharge electric power between the grindstone Electrode 4, insulating material for insulating the electrode 3 from the main body of the grinder, 5 a work shaft for rotating the discharge electrode 3 or the workpiece 11, 6 for supplying one voltage to the grindstone 1 and the discharge electrode A high-voltage discharge power source for supplying a DC pulse current of the other voltage to 3, a machining liquid nozzle 7 for ejecting a grinding liquid or a machining liquid between the grindstone 1 and the electrode 3, and an electrode 8 for electric discharge truing. It is the driving direction.

FIG. 1 (b) shows that a voltage is applied to the conductive grindstone 1 on-machine discharge truing / dressing by applying an electrolysis power source while applying a grinding liquid which tends to form a non-conductive film, and the electrolysis action causes a failure. An example in which a device for depositing a conductor coating on the on-machine discharge truing / dressing conductive grindstone 1 is applied to a rotary surface grinder is shown. Conductive cup-shaped diamond grindstone 1 shown in Fig. 1 (a)
Is attached to the spindle 2 of the grinding machine that rotates the grindstone 1, the discharge electrode 3 is removed from the work shaft 5 together with the insulating material 4, and the work shaft 5 is attached so that the workpiece 11 is rotated. Has been. Reference numeral 9 is an electrode for electrolysis that causes electrolysis between the wheel 1 and the bottom surface of the wheel 1. 10 is an electrolysis power supply that supplies a low-voltage DC pulse current between the wheel 1 and the electrode 9 for electrolysis.
Reference numeral 12 is a workpiece cutting direction when the workpiece 11 is ground.

In operation, first, as shown in FIG. 1 (a), the conductive grindstone 1 mounted on the spindle 2 of the rotary surface grinder is rotated while being mounted on the spindle 2 for the grinding work. A negative voltage is received from the discharge power source 6, and a high positive voltage is received from the discharge power source 6 to the electrode 3. A conductive grindstone 1 rotating on the spindle 2 with respect to the discharge electrode 3.
The bottom surface of the conductive grindstone 1 is melted by several μm due to the discharge by discharging the grinding fluid or the machining fluid from the machining fluid nozzle 7 into the gap between the two, and the bottom surface of the conductive grindstone 1 is removed by the electrical discharge. It becomes flat.

Electric discharge truing with respect to the conductive grindstone 1
After the dressing, the discharge electrode 3 is removed from the work shaft 5 together with the insulating material 4 while the conductive grindstone 1 is still attached to the main shaft 2 as shown in FIG. The workpiece 11 is attached so as to be rotated. The electrolysis electrode 9 is attached to the bottom surface of the on-machine discharge truing / dressed conductive grindstone 1 so that the machining liquid nozzle is provided between the electrolysis electrode 9 and the on-machine discharge truing / dressed conductive grindstone 1. 7. A low voltage is applied using an electrolytic power source 9 while applying a grinding liquid that easily forms a non-conductive film from 7 to the gap between the two, and the non-conductive film is subjected to on-machine discharge truing / dressing by the electrolytic action. The non-conductive coating on the bottom surface of the conductive grindstone 1. Further, the electrolysis is performed in-process even when the work is processed, and the thickness of the non-conductive coating is always made constant.

[0010]

As described above, according to the present invention, the truing / dressing of the conductive grindstone is performed by the on-machine discharge, and the on-machine electrolysis is used only for forming the non-conductive film. Electrolytic truing or dressing setup time is 1/10 compared to electrolytic dressing
The time is extremely short as follows, the influence of the type of binder on the grinding stone and the lot is reduced, and mirror grinding can be performed with high accuracy and stability. This enables highly accurate and stable processing accuracy such as surface roughness and flatness in mirror grinding, and when the processing accuracy deteriorates, the grinding wheel can be re-trued or dressed on the machine. Alternatively, it does not take time to set up the dressing, and there is no need to align with the workpiece.
A mirror grinding method and apparatus using on-machine discharge truing / dressing and an electrolytic non-conductive coating are provided.

[Brief description of drawings]

FIG. 1 is a block diagram of an apparatus according to an embodiment of the present invention in which a mirror surface grinding method using discharge truing / dressing and a non-conductive coating by electrolysis according to the present invention is applied to a rotary surface grinder. Block diagram of the truing / dressing device, (b) shows the voltage applied by using an electrolytic power source while applying a grinding fluid that easily forms a non-conductive film to a conductive grindstone that has been machine-truthed and dressed by the device (a). FIG. 3 is a block diagram of an apparatus that applies a voltage and deposits a non-conductive coating by an electrolytic action.

[Explanation of symbols]

1. ． Conductive cup-shaped diamond whetstone 2. ． Spindle that is a rotating shaft 3. ． Discharge electrode 5. ． 5. Work shaft that rotates the discharge electrode or the work piece. ． Discharge power supply that supplies high-voltage DC pulse current 7. ． Processing liquid nozzle for ejecting grinding liquid or processing liquid 9. ． Electrode for electrolysis 10. ． Electrolytic power supply that supplies low-voltage DC pulse current between the grindstone and the electrode for electrolysis 11. ． Workpiece

Claims (2)

[Claims] 1. A conductive thin blade grindstone mounted on a rotary shaft of a grinding machine is rotated while being mounted, and one voltage is supplied to the conductive grindstone from a high-voltage DC pulse discharge power source, and the discharge power source is supplied from the discharge power source. The other electrode is supplied to the discharge electrode installed on the table of the grinding machine, and the discharge electrode is brought close to the outer peripheral portion or the bottom surface of the rotating conductive grindstone with respect to the surface of the discharge electrode. And discharge the electric discharge while supplying a grinding liquid or a machining liquid between the two, and perform on-machine discharge truing / dressing to shake off and shape the conductive grindstone, and the on-machine discharge truing / dressed conductivity Electrolytic electrodes are attached to the outer peripheral portion or the bottom surface of the conductive grindstone so as to face each other, and there is no gap between the electrolytic electrode and the on-machine discharge truing / dressed conductive grindstone. A low voltage is applied using an electrolytic power source while applying a grinding fluid that easily forms a conductor film, and the non-conductor film is attached to the on-machine discharge truing / dressed conductive grindstone by electrolytic action. A mirror surface grinding method utilizing on-machine electric discharge truing / dressing and electrolytic non-conductive coating. 2. A conductive grindstone mounted on a rotary shaft of a grinding machine, a discharge electrode installed on a table of the grinding machine, and one voltage supplied to the conductive grindstone and the discharge electrode. A discharge power supply for supplying a DC pulse high-voltage current of the other voltage, a grinding liquid nozzle for applying a grinding liquid between the discharge electrode and the conductive grindstone, and the rotation with respect to the surface of the discharge electrode. And an electric discharge machining device for performing on-machine discharge truing / dressing for discharging and shaping the conductive grindstone by causing discharge between the conductive grindstone and the outer peripheral portion or the bottom surface of the conductive grindstone, On-machine discharge truing / dressing, the electrolysis electrode mounted facing the outer peripheral portion or the bottom surface of the conductive grindstone, and one voltage is supplied to the conductive grindstone, and A low-voltage direct current electrolysis power supply for supplying the other voltage to the electrode for electrolysis, and an electrolysis while applying a grinding liquid from which the non-conductive film is likely to be generated between the electrode for electrolysis and the conductive grindstone from the grinding liquid nozzle. An on-machine discharge truing / dressing and electrolysis, comprising: an electrolysis device for applying a low voltage by using a power source to cause an electroconductive action to adhere a non-conductive coating to the on-machine discharge truing / dressing conductive grindstone. Mirror surface grinding machine using the non-conductive coating by.