JPH01199722A - Method and device for electrolytic deburring - Google Patents

Abstract

PURPOSE:To smoothly carry out the electrolysis of burrs wrapped in an electrolyte by closely attaching a thin-walled insulating material on the portion other than a cutout portion on the burr side of a workpiece and allowing to stay or substituting the electrolyte between the workpiece and an electrode from the cutout portion. CONSTITUTION:An electrolyte fed into an electrode 20 from an electrolyte feeding port 22 enters a flow passage 26 through the liquid flow-out ports 28 of the electrode 20 and flows out of a liquid discharge port 32. In this case, since the cutout portion 18 of an inner cylinder 16 is held so as to agree with the cutout portion 12 of a workpiece 10, as the electrolyte arrives at both cutout portions 12, 18, the electrolyte partly stays in this portion while party flowing outward. The electrolyte which stays in the cutout portions 12, 18 and in the electrode 20 forms a chain ring or a bridge 34 connecting burrs 14 to the electrode 20, and the burrs 14 are included in the chain ring. In this condition, as the workpiece is connected to the negative electrode while connecting the electrode 20 to the positive electrode, the burrs 14 which are sufficiently soaked in the electrolyte of the bridge 34 are rapidly electrolyzed by means of the electrolyte, causing a deburring action to rapidly proceed. Since the electrolyte is supplied in succession, the electrolytic action proceeds continuously.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention is aimed at reducing burrs generated on one side of a workpiece, which is a sheet metal part, when machining a notch that passes through the workpiece. The present invention relates to an electrolytic deburring method for electrolytically removing deburring and an apparatus directly used for carrying out this method.

(Background of the Invention) It has been known to perform deburring by electrolysis. This deburring process involves arranging the (positive>'Itt electrode) to face the burr on the workpiece, and performing electrolysis while flowing an electrolytic solution between the two.The burr is removed from the machined part. This occurs along the ridgeline of the corner, but depending on the combination of the shape of the workpiece and the shape of the notch, it can become a complex three-dimensional curve, and the length of the ridge can be long compared to the part dimensions. For example, in parts where multiple cam grooves are formed through a plate or cylinder,
Burrs are formed along very complex curves. Therefore, when deburring, it is necessary to supply an electrolytic solution between the electrode and the burr according to the shape of the iron.
There was a problem in that setting the electrolyte flow path was extremely difficult.

(Purpose of the Invention) The present invention was made in view of the above circumstances, and it is possible to collect the electrolyte evenly only in the immediate vicinity of the burr formed along a complicated curve, and to oppose the burr. The first objective is to provide an electrolytic deburring method that causes an electrolytic action between the burr and the burr and does not cause non-compatibility such as discoloration due to electrolysis around the burr. A second object of the present invention is to provide an apparatus that can be used directly for carrying out this method.

(Structure of the Invention) According to the present invention, the first object is to penetrate the workpiece of a plate-shaped metal part and form it on one side of the workpiece when machining the arrow part. In a method of electrolytically removing burrs, a thin insulating material is kept in close contact with the surface of the workpiece on the burr side, leaving the cutout portion, while the thin insulating material and the side opposite to the workpiece are kept in close contact with each other. An electrolyte is supplied to an electrolyte flow path formed between the electrodes disposed opposite each other, and the electrolyte is guided to the workpiece and the notch of the thin insulating material to connect the workpiece and the 'electrode'. This is achieved by an electrolytic deburring method characterized in that the burr is removed by electrolyzing the burr between the burrs and the burr.

The second [] target is a cylindrical metal part having a penetrating notch as a workpiece, and electrolysis is used to remove burrs that are formed on the inner circumference of the workpiece during machining of the notch. The apparatus includes: a thin insulating inner cylinder that is in close contact with the inner circumferential surface of the workpiece and has a notch portion having substantially the same shape as the notch portion; and an insulating inner cylinder located inside the insulating inner cylinder. and an inner electrode forming an electrolyte flow path between the
This is achieved by an electrolytic deburring device characterized in that the electrolytic solution supplied to the flow path is introduced between the insulating inner cylinder and the workpiece, or between the vicinity of the J-frame portion and the inner electrode for electrolysis. Ru.

By providing an insulating outer cylinder that is in close contact with the outer peripheral surface of the workpiece, it is possible to prevent the electrolyte from flowing out.

(Example) Fig. 1 is a sectional view of an embodiment of the present invention, Fig. 2 is a perspective view of a workpiece used here, Fig. 3 is an enlarged sectional view of a part thereof, and Fig. 4 is an electrolytic FIG. 3 is an enlarged cross-sectional view showing how a bridge is formed.

As shown in FIG. 2, this liquid additive 10 is a cylindrical metal part, and a plurality of notches 12, which are cam grooves, are formed by machining such as cutting. For this reason, burrs 14 are generated at the corners of the notch 12 on the inner peripheral surface side (third
figure). In FIG. 1, reference numeral 16 denotes a thin insulating inner cylinder with a closed upper end, and the outer peripheral surface of this inner cylinder 16 is in close contact with the inner peripheral surface of the workpiece 10. This inner cylinder 16 is formed with a jig frame part 18 having approximately the same shape as the notch 12 of the workpiece lO. 10 notches 12. Reference numeral 20 denotes an electrode, which is formed in a cylindrical shape so as to face the inner surface of the inner surface 7 and 216 with an appropriate distance therebetween. The f and x portions of this electrode 20 are closed, and
An electrolyte supply [122] is formed at its bottom. The inner cylinder 16 is covered with the electrode 20, and its lower end surface is overlapped with the upper end surface of the electrode 20 and fixed with a bolt 24. Note that a cylindrical space is formed between this inner cylinder 16 and the electrode 20, and this space serves as a substantially vertical electrolyte flow path 26. Note that the electrode 20 is provided with a liquid outflow port for guiding the electrolyte supplied from the electrolyte supply port 22 to the electrolyte flow path 26.
128 is provided in duplicate. Further, a flange portion 30 extending toward the outer circumference with a gap from the electrode 20 is formed at the lower edge of the inner cylinder 16, and a liquid discharge port 32 is formed between the flange portion 30 and the electrode 20. Note that the workpiece 10 is positioned against the flange portion 30 in the vertical direction.

Therefore, in the state of 11Δ, if a pre-electrolyzed solution is supplied from the electrolyte supply port 22 into the electrode 20, this electrolyte enters the flow path 26 from the solution outlet 28 of the electrode 20 and is discharged [132
flows out from the At this time, the inner cylinder I6 is held so that the notch 18 (9) corresponds to the notch 12 of the liquid material 10. Therefore, when the electrolytic solution in the flow path 26 reaches both of these matching J bridge portions 12, 18, a part of it stays there and a part flows out. And these notches 12, 18
And the solution remaining in the electrode J420 forms a chain ring or bridge 34 connecting the burr 14 and the upper electrode 20,
The flash 14 is included in this chain ring.

In this state, liquid addition-1: The object is brought to a negative potential and the electrode 20
1]: When connected to a potential, the burrs 14 immersed in a sufficient amount of electrolyte are rapidly electrolyzed by the electrolyte, and the deburring action rapidly progresses. Since the bridge 34 is constantly replenished with new electrolyte solution, the temperature rise of the electrolyte solution does not become a problem, and the electrolytic action progresses continuously. The period of energization 11v is usually several seconds to 10-odd seconds. This electrolysis effectively removes the burr 14.

In this embodiment, the outer peripheral surface of the workpiece IO is exposed to the outside,
Since the notch 12 is also exposed, the electrolyte flowing through the channel 26 flows outward through the notch 18.12. Therefore, in this case, it is not necessarily necessary to form the outlet 32 between the flange portion 30 provided on the edge of the cylinder 16 and the north pole 2o. Note that there is an inner cylinder 16 on the inner surface of the workpiece lO.
Since the outer surfaces of the workpiece 10 are in close contact with each other, the inner surface of the workpiece 10 is not electrolytically corroded.

FIG. 5 is a sectional view of another embodiment, and FIG. 6 is an enlarged sectional view showing how the bridge is formed. In this embodiment, an outer cylinder 36 is attached to the outer peripheral surface of the workpiece 10 to prevent the electrolyte from flowing out from the notch 12. According to this embodiment, the electrolyte is applied to the workpiece 10
Since it does not adhere to the outer circumferential surface of the workpiece 10 and flow down, the outer surface of the workpiece 10 is not electrolytically eroded and discolored.

Note that in FIG. 5.6, the same parts as in FIG. 1.4 are marked with a numeral, so their explanation will be omitted.

The outer cylinder 36 is normally made of an insulating material, but by making the outer cylinder 36 of metal and maintaining it at a slightly higher vertical position than the workpiece 10, the outer surface of the workpiece 10 can be prevented from electrolytic corrosion. It is possible to prevent this from happening. That is, instead of the applied object 10, move this outer cylinder from 1°1, ? ;'I' It is possible to use it as a sacrificial electrode for electrolytic corrosion, prevent discoloration of the object 10 due to electrolysis, and give a good finish.

(Effects of the Invention) As described in 1- below, the method of the present invention is to bring a thin insulating material into close contact with the burr side of the workpiece except for the notch, and to introduce an electrolytic solution into the notch of both parts. The accumulated electrolyte is constantly replaced by the supplied electrolyte, and the electrolysis of the burr covered with this electrolyte is performed smoothly.
do.

The device according to the invention also provides a device that can be used directly for carrying out this method.

In particular, if the outer cylinder is brought into close contact with the outer peripheral surface of the cylindrical metal part that is the workpiece, the electrolytic solution will not electrolytically corrode the outer surface of the workpiece, and the finish will be even better.

[Brief explanation of the drawing]

:, fSI IJ is a sectional view of one embodiment of the present invention, FIG. 2 is a shoulder view of the workpiece used here 1Δ, and 314th is its -
FIG. 4 is an enlarged sectional view showing how an electrolyte bridge is formed. Further, FIG. 5 is a sectional view of another embodiment, and FIG. 6 is an enlarged sectional view of a part thereof. lO... Workpiece, 12.18... Notch, 14... Burr, 16... Inner cylinder. 20... Electrode, 36... Outer cylinder. Patent applicant: Aviation Standards Industry Co., Ltd. Agent: Attorney Yama 1) Fumio (and 1 other person) Figure 1 Figure 28 Figure 3

Claims (3)

[Claims] (1) A method for removing burrs formed on one side of a workpiece by electrolysis when machining a notch that passes through the workpiece, which is a plate-shaped metal part, while leaving the notch While holding a thin insulating material in close contact with the surface of the workpiece on the burr side, an electrolyte is introduced into an electrolyte flow path formed between the thin insulating material and an electrode placed opposite to the thin insulating material on the side opposite to the workpiece. An electrolytic deburring method characterized in that the burr is removed by supplying an electrolytic solution to the workpiece and the cutout portion of the thin insulating material and electrolyzing between the workpiece and the electrode. (2) In an apparatus that uses a cylindrical metal part having a penetrating notch as a workpiece, and removes burrs formed on the inner circumferential side of the workpiece due to machining of the notch by electrolysis, a thin-walled insulating inner cylinder that is in close contact with the inner peripheral surface of the workpiece and has a cutout portion having substantially the same shape as the cutout portion;
an inner electrode located inside the insulated inner cylinder and forming an electrolyte flow path between the insulated inner cylinder and the insulated inner cylinder, and an inner electrode that forms an electrolyte flow path between the insulated inner cylinder and the workpiece; An electrolytic deburring device characterized in that electrolysis is conducted between the vicinity of the cutout portion and the inner electrode. (3) In an apparatus that uses a cylindrical metal part having a penetrating notch as a workpiece, and removes burrs formed on the inner circumferential side of the workpiece due to machining of the notch by electrolysis, a thin-walled insulating inner cylinder that is in close contact with the inner peripheral surface of the workpiece and has a cutout portion having substantially the same shape as the cutout portion;
An inner electrode is located inside the insulating inner cylinder and forms an electrolyte flow path between the insulating inner cylinder and the inner electrode is in close contact with the outer peripheral surface of the workpiece to prevent the electrolyte from flowing out from the workpiece. and an insulating outer cylinder that prevents electrolysis, and the electrolytic solution supplied to the flow path is guided between the insulating inner cylinder and the vicinity of mutually overlapping notches of the workpiece and the inner electrode for electrolysis. Deburring device.