JPH10102297A - Barrel for electric treatment and plating method using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable periodic pulse energization as well without requiring an excessive power source by providing the inside surface of a rotary barrel for an electrochemical treatment with an insulative partition which comes into contact with an energizing bar and gradually decreasing the quantity of the works to be treated on this partition by rotation of a barrel. SOLUTION: The conductive bar 6 is arranged on the inside surface of the rotary barrel 1 in a treating vessel 9 contg. a treating liquid 8 and the partition 3 consisting of an insulating material is disposed between the same and the inside surface of the barrel 1. The many small-sized works 7 to be treated which are supplied into the barrel fall into the bottom of the barrel 1 from above the partition 3 as the barrel 1 rotates. The quantity of the works 7 to be subjected to the energization treatment between outside electrodes 5 from the center bar 6 on the partition 3 decrease as the barrel rotates. The electrochemical treatment, such as electric polishing, is executed even with a power source of a small capacity. The periodic energization to the works 7 is made possible by continuing the rotation. The easy execution of the pulse plating, etc., by the rotation of the barrel is made possible without requiring special devices.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric processing barrel for performing electric processing.

[0002]

2. Description of the Related Art A barrel for electrochemical treatment is shown in FIG.
As shown in (b), a support structure 20 for supporting the barrel main body 10, an external electrode 50 in a processing liquid tank 90 containing a rotation driving mechanism 70 and a processing liquid 80 for rotation, and a conductive round rod-shaped barrel. Barrel main body 1 having electrode 60 at center
0 and a power supply (not shown).
By rotating the barrel main body 10, an electrochemical reaction is caused on the surface of the work electrically connected to the in-barrel electrode 60, and the surface is polished, etched, degreased, and plated. .

The conventional processing method using a barrel is characterized by processing a large number of workpieces at once, but in the case of an electric barrel, it is required to supply a current corresponding to the amount of the workpiece. Since the amount of current becomes very large and a large-scale power source is required, the barrel for electric processing has not been widely applied to applications requiring a high current density setting. Among the electroplating methods, there is a technique called a pulse plating method in which a current is intermittently applied for the purpose of improving plating characteristics or performing high-speed plating. However, a complicated and expensive power supply is required to perform this. It was necessary and the application of the barrel for electric treatment was few.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide an electric processing barrel capable of performing a large amount of processing and pulse plating without a large power supply capable of flowing a large current or a complicated power supply capable of generating a pulse current.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to an electric processing for accommodating a work and supplying an electric current to the work through a conductive bar to perform an electrochemical treatment of the work. A partition made of an insulating material is provided from the conductive bar to the inside surface of the barrel main body, and a part of the work on the partition surface is rotated by rotating the barrel main body to the partition back side. The spilled work remaining on the partition surface is supplied with electric current from the conductive bar, and the spilled work is cut off from being supplied with electric current from the conductive bar. Provided is a barrel for electric processing in which an amount of a work to be supplied with an electric current is set to an optimum value for a current value.

Further, the present invention provides an electric processing barrel in which the conductive bar is a center bar serving as a rotation center of the barrel main body. In addition, the partition is provided by gripping the conductive bar, and the conductive bar grip portion of the partition is such that the conductive bar is exposed on the surface side of the partition, and a work mounted on the partition surface is provided. On the back side of the partition to receive the current supply from the conductive bar is covered by the grip portion,
Provided is an electric processing barrel adapted to block a spilled work from being supplied with electric current from a conductive bar.

Another object of the present invention is to provide a plating method in which a current supplied to a work is periodically changed by rotation of the electric processing barrel body to perform pulse plating on the work. Further, by changing the rotation speed of the barrel for electric processing,
A pulse plating method for changing a pulse period of a current supplied to the work is provided.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a front sectional view of an electric processing barrel according to one embodiment of the present invention. The barrel for electric processing includes a barrel main body 1 for accommodating the work 7, a support structure 2 for supporting the barrel main body 1, a driving structure 4 for rotating the barrel main body 1, a processing tank 9 for accommodating the processing liquid 8 and accommodating the barrel main body 1. A conductive center bar 6 penetrates the center of the barrel main body 1, and the barrel main body 1 rotates around the center bar 6. A partition 3 made of one insulating material extends from the wall surface of the barrel body 1 to the center bar 6, and the end face of the partition 3 on the side of the center bar 6 covers and holds half of the center bar 6 when viewed from the cross section. . The barrel body 1 is immersed in a processing tank 9 filled with a processing liquid 8. The work can be applied to, for example, an airtight terminal, a fishing hook, a screw, and other components. The partition does not necessarily need to be in contact with the conductive bar or the inner surface of the barrel main body 1, but may be any as long as the work is supplied with current from the conductive bar.

FIG. 2 is a side sectional view of FIG. According to this embodiment, when the barrel main body 1 is rotated, a part of the work 7 spilled from above the partition 3 made of an insulating material turns to the back side of the partition 3, and the current is supplied from the center bar 6. You are blocked from receiving. The amount of the work 7 in contact with the center bar 6 and through which the current flows gradually decreases as the rotation progresses,
Since the total surface area of the work 7 remaining on the surface of the partition 3 is sufficiently small, the current value applied to the work 7 can be set to an optimum value even with a small power supply. In the case of electrolytic polishing, the optimum current value is determined by the material of the work, but in the case of the stainless steel of this embodiment, the current density is 30 to 500 A / dm.
Second place is appropriate. According to the present invention, unlike in normal electrolytic polishing, unevenness in polishing due to current shading is reduced.

The processing situation will be described with reference to FIG. First, the work 7 is put into the barrel main body 1 provided by passing the partition 3 of the insulating material from the conductive center bar to the inner surface side of the barrel main body, and the barrel main body 1 is rotated in the direction of the arrow (a). At this time, the current applied to the work 7 from the conductive center bar 6 serving as an electrode is a small current for each work 7 because the amount of the work 7 is large and the total surface area is large (b). However, when the rotation of the barrel main body 1 is advanced, the work 7 spills on the electrode side and the back side, and the supply of current from the conductive center bar is cut off (c). When the rotation is further advanced, the amount of the work 7 remaining on the partition 3 decreases, the surface area of the work 7 through which the current flows becomes small, and a sufficiently large current flows through the work 7 (d). By repeating the rotation of the barrel main body 1 many times in this manner, an optimum high current application can be performed very easily and uniformly over the entire work without strictly setting polishing conditions (e).

FIG. 4 is a sectional view of a second embodiment of the present invention. This embodiment is the same as the first embodiment except that the polarity of the conductive center bar, which is the electrode of the first embodiment, is opposite and the work 7 is plated. The same reference numerals are given and the description is omitted.
In this embodiment, when plating is performed, the current flowing through the work 7 changes from 0 to a sufficiently high value, so that pulse plating that can reduce adverse effects such as polarization due to constant current plating can be performed without preparing a complicated power supply. There is an advantage that it can be realized. The pulse width of the plating varies depending on the material of the work, but in the embodiment, 3 to 5 seconds is appropriate, and the rotation speed is 12 to
It was 20 times / minute. In the case of plating as well, optimal pulse plating can be realized extremely easily without strictly setting plating conditions as in the case of electropolishing. In addition, in the case of plating that is difficult if any overcurrent flows, the amount and angle of the work on the partition may be known in advance, and the current may be stopped at an angle where the overcurrent occurs. On the contrary, the current can be supplied only when the angle is the optimum current.

[0012]

As described above, according to the present invention, by making the amount of work on the partition appropriate for the current value,
There is an advantage that a large number of workpieces can be processed at once by enabling processing with small power and repeating the processing. Further, pulse electric processing can be performed without using a complicated power supply, and the cycle thereof can be arbitrarily set by changing the rotation speed of the barrel main body.

[Brief description of the drawings]

FIG. 1 is a front sectional view of a first embodiment of the present invention.

FIG. 2 is a side sectional view of the first embodiment of the present invention.

FIG. 3 is a diagram showing a state of a work in a barrel according to the present invention.

FIG. 4 is a sectional view of a barrel according to a second embodiment of the present invention.

FIG. 5 is a sectional view of a conventional barrel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Barrel main body 3 Partition 3a Gripping part 6 Conductive bar 7 Work 8 Processing liquid 9 Processing tank

Claims (5)

[Claims] 1. An electric processing barrel for accommodating a work and supplying an electric current to the work through a conductive bar to perform an electrochemical treatment of the work, wherein a partition member made of an insulating material is connected to the conductive member. Provided from the bar to the inside surface of the barrel main body, rotate the barrel main body to move a part of the work on the partition surface to the partition back surface side, and the work on the partition surface receives current supply from the conductive bar So that
A barrel for electrical processing, wherein the work on the back surface is cut off from receiving a current from the conductive bar to optimize the current from the conductive bar and the amount of work with respect to the current value. 2. The apparatus according to claim 1, wherein the conductive bar is a center bar serving as a center of rotation of the barrel body.
A barrel for electrical processing as described. 3. The partition is provided by gripping the conductive bar. The conductive bar grip portion of the partition is such that the conductive bar is exposed on the front side of the partition, The work placed on the surface of the partition is supplied with current from the exposed portion of the conductive bar, and the back surface of the partition is covered by the gripping portion, and the spilled work supplies the current from the conductive bar. 2. The barrel for electrical processing according to claim 1, wherein the barrel is blocked from receiving. 4. A plating method for performing pulse plating on a work by periodically changing a current supplied to the work by rotating the electric processing barrel. 5. A pulse plating method for changing a pulse period of a current supplied to the workpiece by changing a rotation speed of the barrel for electric processing.