KR19980040305A - Deburring device using CBN electrodeposition grindstone and electrolytic action - Google Patents

Abstract

The present invention relates to a method and apparatus for removing burrs formed around a hole of a workpiece by using a cubic-boron-nitride electroplated wheel and electrolysis. An object of the present invention is to provide a deburring apparatus and method by maximizing the deburring effect by combining the mechanical deburring using CBN electrodeposited grindstone and electrochemical deburring using electrolytic action. In order to achieve this purpose, the present invention is an electrochemical method by mechanically removing most of the burrs around the hole of a workpiece with a cemented carbide rod electrodeposited with CBN particles, and electrolytically eluting the burrs protruding from the cemented carbide rod as an electrode. The basic concept is to remove the residual burrs and the burrs formed secondary by mechanical deburring. The apparatus of the present invention is applicable to a workpiece having a burr-formed hole, in particular a workpiece having an intersecting hole inside a long workpiece such as a governor shaft or a crankshaft such as an exhaust valve.

Description

Deburring device using CBN electrodeposition grindstone and electrolytic action

The present invention relates to a deburring apparatus for removing burrs of a workpiece. More specifically, the present invention uses a CBN electrodeposited grindstone (cubic-born-nitride electroplated wheel) and an electrolytic action of burrs formed when a hole is drilled into a governor shaft such as an exhaust valve or a crankshaft. It relates to a method and a device for removal.

A burr refers to a curled work piece formed near an edge when cutting or drilling a metal material, and generally has a negative effect such as degrading the quality of the work piece. In particular, in the case of a ball having a cross hole therein such as a governor shaft or a crank shaft such as an exhaust valve, since a burr is also formed at an internal hole intersection point, a deburring process of removing the burr is essentially included.

Conventionally, deburring was performed as a manual post-processing step. This method uses a reamer or countersinking drill to cut around the hole.

However, in this method, the burr around the hole exposed to the outside can be removed relatively easily, but the burr formed in the inner hole is difficult to remove, and the edge of the burr is removed because the drilling must be repeated several times by a skilled worker. There is a problem of inefficient deburring method such as deterioration of quality, change of dimension and additional screening of final pass through quality inspection process. In addition, mechanical deburring also inevitably involves a secondary burr.

Accordingly, the present invention, as a result of earnest research to solve the problems of the conventional deburring method, while removing the burrs protruding into the workpiece with the grindstone electrodeposited CBN (cubic-born nitride) particles on the cemented carbide rod, By removing the remaining burrs by the electrochemical method by electrolysis of the electrolyte solution, it was confirmed that more effective deburring can be achieved in a shorter time than that required for conventional deburring, and the present invention was completed.

After all, it is an object of the present invention to provide a deburring apparatus and method that maximizes the deburring effect by combining mechanical deburring using CBN electrodeposition grindstone and electrochemical deburring using electrolytic action.

1 is a conceptual diagram showing the principle of deburring according to the present invention.

2nd is a detailed view which shows the top view and electrodeposition part of the CBN electrodeposition grindstone used for the apparatus of this invention.

3 is a front view showing a deburring apparatus of the present invention.

* Explanation of symbols for the main parts of the drawings

1: workpiece, 2: CBN electrodeposition grindstone, 3: spindle spindle, 4: workpiece fixed chuck, 5: workpiece bite motor, 6: chuck support, 7: insulation plate, 8: electrolyte outlet, 9: power supply, 10: Transfer lever, 11: Burr formed at the intersection point of the inside diameter of the workpiece, 12: Carbide rod, 13: CBN electrodeposition part

Hereinafter, with reference to the accompanying drawings will be described the basic principle, configuration and operation of the deburring device (hereinafter abbreviated as the present device) using the CBN electrodeposition grindstone and electrolytic action of the present invention. FIG. 1 is a conceptual diagram showing the basic principle of deburring according to the apparatus, and FIG. 2 is a plan view showing the CBN electrodeposition grindstone used in the apparatus. 3 is a front view showing the configuration of the apparatus implemented according to this basic principle.

The basic principle of the apparatus will be described with reference to FIGS. 1 and 2 as follows. As shown in the figure, the device is basically a workpiece (1) by inserting and turning a cemented carbide rod (12) with a CBN particle electrodeposited (13) into the workpiece (1) intersecting holes in the longitudinal and transverse directions therein. It removes the burr 11 inside, and implements by the method of supplying and deburring electrolyte solution simultaneously. A power source 9 is applied between the workpiece 1 and the CBN electrodeposition grindstone 12 to electrolytically elevate the bur which is the protruding portion of the anode.

As shown in FIG. 2, the grindstone used in this apparatus is fabricated to function as a grindstone by electrodepositing CBN particles on a long cemented carbide rod 12, whereby the cemented rod 12 is a workpiece (1). The position of the burr should cover the width of the burr when it is fully in the hole.

Since the hole of the work piece 1 is narrow and long, the grindstone used for this apparatus is produced by the thin long, highly rigid superhard material, and electrodeposits CBN particle | grains with high hardness, abrasion resistance, heat resistance, and thermal conductivity. The CBN particles are tens of microns in size and are Ni wet electrodeposited to a few hundred microns thick. Thus, the grindstone used for this apparatus which electrodeposited CBN particle | grains to the base material, ie, a cemented carbide rod in a single layer, was not only profitable in manufacturing technology or economically, but also inferior in performance compared with the conventional multilayer grindstone.

In summary, the device uses a cemented carbide rod electrodeposited with CBN particles to remove most of the burrs around the hole of the workpiece mechanically, and electrolytically elutes the burrs protruding from the cemented carbide rod as electrodes. The basic concept is to remove the burrs formed secondary by deburring.

Referring to FIG. 3, the configuration of the apparatus is as follows. As shown in the figure, the apparatus automatically controls the chuck 4 to fix the workpiece 1 to be deburred, such as the governor shaft or crank shaft of the exhaust valve, and the workpiece fixed chuck 4 automatically. The workpiece bite motor 5, the chuck support 6 which supports the workpiece fixed chuck 4, the CBN electrodeposition grindstone 2 inserted and rotated into the hole of the workpiece 1, and this CBN electrodeposition grindstone 2 Main spindle spindle (3) fixing the feedstock, a transfer lever (10) for transferring the CBN electrodeposition grindstone (2) up and down, and a power supply device (9) for supplying electricity to the CBN electrodeposition grindstone (2) and the workpiece (1). ), An insulating plate (7) laid under the chuck support (6) to insulate the work piece (1) from other elements, and an electrolyte injection hole (8) for injecting an electrolyte solution into the hole of the work piece (1).

The magnetic field of the apparatus constructed as described above will be described below.

First, the operator installs the workpiece 1 with a hole to be deburred in the apparatus. The workpiece 1 is fixed to the fixed chuck 4, which is mounted to the chuck support 6. The workpiece fixing chuck 4 is preferably used to accurately match the central axis of the CBN electrodeposition grindstone (2) and the hole center axis of the workpiece (1), preferably using a 3-jaw chuck. good. The operator turns on and off the workpiece bite motor 5 so that the workpiece fixed chuck 4 can bite the workpiece 1 automatically. Therefore, in order to fix the workpiece 1 at the correct position, the workpiece entanglement motor 5 must be correctly centered initially.

When the transfer lever 10 is lowered for deburring, the spindle spindle 3 with the CBN electrodeposition grindstone 2 fixed thereon descends, and the CBN electrodeposition grindstone 2 is inserted into the hole of the workpiece 1 and rotated while the burrs of the workpiece hole are rotated. Remove it. Most burrs can be removed by this CBN electrodeposition grindstone 2. The spindle spindles 3 were turret type for continuous deburring.

At the same time as the deburring by the CBN electrodeposition grindstone 2, the electrolyte is injected into the hole of the work 1 by the electrolyte jet port 8. In addition, (-) electricity is applied to the CBN electrodeposition grindstone (2) through the spindle spindle (3) and (+) electricity from the power supply device (9) to the work piece (1) through the chuck support (6). The applied electricity activates the electrolyte between the workpiece 1 and the CBN electrodeposited grindstone 2 and elutes the protruding burrs, thereby eliminating the remaining burrs or secondary formed burrs not removed by the CBN electrodeposited grindstone 2 grindstone. Can be. As a result of the deburring using this apparatus, the same amount of deburring was possible in 1/3 time of the time required for the conventional deburring.

The power supply device 9 preferably outputs a pulse power source in which the pulse width and the idle width are adjusted from several mA to several tens of mA, and the maximum value of the current is adjusted from several A to several tens A. By controlling the power applied using the power supply device 9, the electrolytic action could be stabilized according to each electrolyte solution. The polarity of electricity applied to the work 1 and the CBN electrodeposited grindstone 2 can be arbitrarily determined according to the type of electrolyte. In addition, an insulating plate 7 was laid under the chuck support 6 to insulate the work 1 and the CBN electrodeposition grindstone 2.

As described above, when the deburring is performed using the apparatus, deburring can be performed in a shorter time than the time required for the conventional deburring, and the deburring portion is clean, and no separate post-processing is necessary. Therefore, it is possible to produce parts of excellent quality and to reduce production costs.

Claims (8)

Inserting and rotating the cutting tool into the hole of the workpiece to mechanically remove the burr, and at the same time, the burr is electrochemically removed by injecting electrolyte into the hole of the workpiece while the tool and the workpiece are energized. . The deburring method according to claim 1, wherein the cutting tool is prepared by electrodepositing CBN particles on a rod made of cemented carbide material. A deburring apparatus for removing burrs around a hole of a workpiece, the deburring apparatus comprising: fixing means for fixing the workpiece; A cutting tool inserted into the hole of the workpiece and rotating; Fixing means for fixing and rotating the cutting tool; Power supply means for supplying electricity to the cutting tool and the workpiece; And an electrolyte ejection outlet for supplying an electrolyte solution to the hole of the workpiece. 4. The deburring apparatus according to claim 3, wherein the work fixing means further comprises a fixed chuck for fixing the work and a workpiece bite motor for operating the fixed chuck to fix the work. The deburring apparatus according to claim 3, wherein the cutting tool is prepared by electrodepositing CBN particles on a rod made of cemented carbide. 4. The deburring apparatus according to claim 3, wherein the cutting tool fixing means moves up and down as spindle spindles. 7. The deburring apparatus according to claim 6, wherein the spindle spindles are turret shaped. The deburring apparatus according to claim 3, wherein the power supply means outputs pulsed electric power.