JPS6186140A - Electrolytic removal for burrs - Google Patents

Abstract

PURPOSE:To suppress the formation of oxydized film by allowing electrolytic liquid to flow at a high speed in the narrow gaps between the insulating members arranged at the part where electrolysis is not necessary and the wall surfaces of the flow-out passages for electrolytic solution. CONSTITUTION:Electrodes 6 and 13 are arranged in close to the burrs 4 and 5 for a workpiece 1, and are brought into electric conduction, feeding electrolytic liquid from the electrolyte feeding hole 17 of the electrode 6. The electrolytic liquid flows-out in the direction of arrow (a) from the narrow passages 9 and 12 between the wall surfaces of the flow-out passages between insulating members 8 and 10, transverse hole 3, and a vertical hole 2. The burrs 4 and 5 are dissolved and removed by the electrolytic action, and the gas formed by the electrolytic action speedily flows outside with the electrolytic liquid whose flow speed is accelerated by the gaps 9 and 12 which are narrowed by the insulating members 8 and 10. Therefore, only the burrs 4 and 5 are electrolyzed and removed because of the presence of the insulating members 8 and 10, and the wall surfaces of the transverse and vertical holes 2 and 3 are not oxydized.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention is a method of dissolving and removing burrs generated by cutting or drilling metal products or non-ferrous metal products using an electromagnetic liquid and an electrode. This relates to a deburring method.

[Prior Art] Various methods are generally known for removing burrs by electrolysis. For example, an electrolytic deburring method is disclosed in Japanese Patent Publication No. 49-39744 and Japanese Patent Publication No. 50-31103.

In the method of deburring the previous stone, an insulating material supporting the electrode is applied to the part of the workpiece that does not require electrolysis, and the electrode is slid. Prevents R-liquid from flowing in. In addition, the electrolyte can freely flow out of the holes drilled from the side of the cylinder without providing equivalent insulating material.

With this deburring method, if an insulating material is applied, the sliding aa of the insulating material may be removed when it is removed from the workpiece.
! Not only is there a lot of wear and tear, but the usable life of extinct wood is short;
The insulating material must always be formed on the outer circumferential surface that perfectly matches the contact surface of the workpiece, and depending on the part to be processed on the workpiece, there is the inconvenience that a large number of insulating materials of various shapes must be prepared. be. Also, if deburring is performed without any insulating material placed in the drilled holes, parts other than the burr will also be electrolyzed, and parts far from the electrode that do not require deburring will be removed. An oxide film is formed.

This is because the electrolytic solution stagnates or its flow rate becomes slow, and the gas (hydrogen gas) generated during electrolysis oxidizes the surface and forms an oxide film.

Therefore, if the workpiece to be processed has been honed and polished, the finished surface will become rough due to excess electrolysis and the formation of an oxide film, making it difficult to apply electrolytic deburring methods. It has become.

Furthermore, in the latter deburring method, when removing burrs from holes drilled from the side of the cylinder, an electrode is inserted inside the cylinder to be machined, and the insulating material provided outside the electrode and the inside of the cylinder are removed. There is a narrow gap between the electrode and the wall, and the electrolyte flows into this gap and stagnates, forming an oxide film.The electrolyte also flows into the inner wall of the cylinder on the tip side of the electrode, causing oxidation. A film is formed.

[Problems to be Solved by the Invention] The present invention solves the problem that electrolysis occurs in parts of the workpiece that do not require electrolysis other than the deburring part, or that an oxide film is formed at a position away from the electrode while the electrolyte is flowing out. This is an attempt to solve the problem of the conventional example that .

[Means for Solving the Problems] As a specific means for solving the above-mentioned problems, the present invention provides an insulating material in a portion that does not require electrolysis in the electrolyte outflow passage leading to the deburring portion of the workpiece. 21B, a narrow gap is provided between the insulating material and the wall surface of the electrolyte outflow passage, and the electrolyte is allowed to flow at high speed so as not to stagnate in the gap 1). The present invention provides an electrolytic deburring method characterized by the fact that by disposing the insulating material, the outflow passage is narrowed twice, so that the flow rate of the electrolytic solution is further increased,
Since there is no stagnation of electrolyte, no oxide film is formed.

Furthermore, the presence of the insulating material prevents electrical leakage to areas other than the deburring area that do not require electrolysis, eliminating electrolysis at unnecessary locations.

[Example] Next, the method of the present invention will be explained in more detail based on the illustrated example. Reference numeral 1 is a workpiece, and the workpiece has burrs 4, 2, and 4 burrs in the wildflower 2, horizontal hole 3, etc., by drilling or the like. 5 is occurring. These burrs are divided into burrs 4 exposed on the outside and burrs 5 generated on the inside, and both burrs are simultaneously dissolved and removed.

In this case, the workpiece 1 is set on a crocodile stand (not shown) with the horizontal hole 3 facing upward, as shown in FIG. 2, and is subjected to electrolytic deburring. The electrode 6 is inserted into the horizontal hole 3 of the workpiece 1 set in this way, and the electrode 6 has an electrolyte supply hole 7 in the center, and the entire circumference is made of insulating material except for a part of the tip. covered by 8. The electric collar 6 and the insulating material 8 are made not to come into contact with the workpiece 1, and a narrow gap 9 is provided between the insulating material 8 and the inner wall surface of the horizontal hole 3 for the electrolyte to flow out. 4′
The tip of fA6, ie, the exposed portion, is located close to burr 5.

A rod-shaped insulating material 10 is inserted into the vertical hole 2 from one side. In this case, the insulation material is an appropriate air cylinder mechanism 1.
1, it can be freely taken in and out of the pit 2, and a narrow gap -12 is formed between it and the wall surface of the pit 2, that is, the wall surface that serves as an outflow passage for the electrolyte. Electrodes 13 are set close to the burrs 4 exposed to the outside from the outside.

[Function] As described above, the electrode 6゜13 is placed close to the burr 4.5 on the workpiece 1, and the electrolyte supply hole 7 of the electrode 6 is placed close to the burr 4.5.
Electricity is applied to each electrode 6.13 while feeding the electrolyte from the electrode 6.13. The electrolyte flows from a narrow gap 9°12 between the insulating material 8.10 and the horizontal hole 3 and vertical hole 2 of the workpiece, that is, the wall surface of the electrolyte outflow passage, as shown by arrow a. leak.

Therefore, an electrolytic solution is present between the electrode and the burr, and the burr 4.5 is dissolved and removed by the electrolytic action. The gas generated by this electrolytic action quickly flows out together with the electrolyte through the narrow gap 9.12, and does not stagnate inside. In other words, the part that becomes the flow path for the electrolyte is covered with insulating material 8.1.
By narrowing the hole by 0 and increasing the flow rate of the electric F/I' liquid, gas stoppage: ltl is eliminated, and furthermore, by the presence of an insulating material, especially the presence of an insulating material 10 for the electrode 6, the vertical hole facing the electrode 6 is narrowed. The wall surface of 2 is not electrolyzed at all, and the burrs 1 and 2 are effectively removed by electrolysis. Therefore,
The walls of the gap 9°12 are also the walls of the vertical hole and the horizontal hole, and these walls are areas that are not desired to be oxidized or electrolyzed. And deburring can be done without electrolysis.

After deburring, as shown in FIG. 3, the power to the electrode is turned off and the supply of electrolyte is also stopped, and the air cylinder 11 is operated to remove the insulating material 10 from the workpiece 1.
By scraping and lowering the work table, the horizontal hole 3 is opened.
The electrode 6 is removed from the workpiece 1, and the workpiece 1 is ejected into a predetermined shooter.

The relationship between the electrode 6 and the workpiece 1 is applicable not only to deburring but also to electrolytic machining.

That is, as shown in FIG. 4, a predetermined hole 3a is provided in the workpiece 1a, and the electrode 6 can be used to form an expanded portion 20 shown in phantom inside the abutment of the hole.

In this case, the tip of the electrode 6 is positioned so that it does not hit the bottom of the hole 3a, and a narrow gap of 11'' is created between the wall surface of the hole 3a and the insulating material 8 covering the outer peripheral surface of the electrode 6-. 21, and when the electrode 6 is energized and the electrolyte is supplied from the electrolyte supply hole 7, the exposed tip of the electrode 6 and the hole 3
An electrolytic action occurs between the base part a and the vicinity of the bottom part, and an expanded part 20 having an overall spherical shape is formed. Then, the supplied electric F//liquid is applied to the narrow gap 2 between the wall surface of the hole 3a and the insulating material 8.
1 flows out to the outside. In this case, gas is generated by the electrolytic action, but these gases flow out from the narrow gap 21 together with the electrolyte at an increased flow rate, so they do not stagnate or adhere to the wall surface, and therefore the wall surface is not oxidized. will disappear.

[Effects of the Invention] As explained above, the electrolytic deburring method according to the present invention is achieved by disposing an insulating material in the electrolyte outflow passage leading to the deburring portion of the workpiece and in the part that does not require electrolysis. The outflow passage is narrowed, thereby increasing the flow rate of the electrolyte, so that the gas generated by the electrolytic deburring process quickly flows out together with the electrolyte, and the gas does not stagnate inside. This has the excellent effect of preventing the internal wall surface of the workpiece from being oxidized.

In addition, since there is an insulating material inside the workpiece, parts that do not require deburring are protected from being electrolyzed, so it can also be applied to deburring honed and polished workpieces.

Furthermore, since the insulating material is placed so that it does not touch or come into contact with the workpiece, there is no friction between it and the workpiece as in conventional examples, and the insulating material can be used for a long period of time. Since the material simply narrows the outflow passage for the electrolytic solution, dimensional accuracy is not required so much, and it also has the excellent effect of being able to be formed relatively roughly.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an example of a workpiece to be subjected to electrolytic deburring, Fig. 2 is a schematic sectional view of the same workpiece when applied to the electrolytic deburring method of the present invention, and Fig. 3 is a sectional view showing an example of a workpiece subjected to electrolytic deburring. 1'0
FIG. 4 is a schematic cross-sectional view of an electrolytic deburring part in the electrolytic deburring method 1, and FIG. 4 is a schematic cross-sectional view when the same electrolytic deburring method is applied to an electrolytic machining method. 1.1a... Workpiece 2... Vertical hole 3... Horizontal hole 4.5...
Burr 6, 13... Electrode 7... Electrolyte supply hole 8, 10... Cutting material 9.12.21...
Narrow gap 11 serving as an electrolyte outflow passage... Air cylinder i structure

Claims (1)

[Claims] An insulating material is provided in the electrolytic solution outflow passage leading to the deburring portion of the workpiece and in a part that does not require electrolysis, and a narrow gap is provided between the insulating material and the electrolytic solution outflow passage wall surface. An electrolytic deburring method characterized in that the electrolytic solution is caused to flow at a high speed so as not to stagnate in the gap.