JPH09256197A - Inspecting method for electrically conductive characteristics of hanging jig for electrolytic surface treatment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inspecting method by which electrically conductive characteristics of a hanging jig for hanging and holding a material to be treated for use in the anodic oxidation treatment, electrolytic coloring treatment and electrodeposition coating, etc., and a change thereof are accurately evaluated by the use of measuring equipment without resorting to the conventional visual judgement. SOLUTION: A conductive detecting member 2 for inspection is bitten and held on one side of the hanging jig 1 to be inspected, an electric circuit is formed between the conductive detecting member 2 and the other side of the hanging jig 1, the contact resistance between the conductive detecting member 2 and the hanging jig 1 is measured, and the electrically conductive characteristics of the hanging jig are evaluated depending on whether the resistance value exceeds a set value or not.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of inspecting a conductive characteristic of a holding type hanging jig used when a long aluminum material is hung vertically for surface treatment.

[0002]

2. Description of the Related Art A long aluminum alloy material, for example, a long aluminum alloy extruded material or pipe having a total length of 5 to 10 meters as a raw material used for general materials and building materials is anodized. When performing surface treatment such as treatment, electrolytic coloring treatment, and electrolytic treatment such as electrodeposition coating, each treatment is performed while being suspended and held by a suspending jig. That is, a large number of long aluminum materials to be treated are hung on a conductive bus bar laid on a traveling carriage via a hanging jig, and the treatment liquid filled in a large number of treatment tanks provided along the transfer line The material to be treated is subjected to a series of treatments in which it is repeatedly dipped in and then baked and dried in a heating furnace to form a desired coloring or film on the material to be treated.

During the electrolytic surface treatment process, the hanging jig for holding and holding the material to be treated is aluminum, which is a conductive material,
It is made of copper or stainless steel, and has a structure in which a material to be processed is held by being held by a spring pressure between a holding rod and a holding claw. Since this hanging jig is lowered to a position close to the liquid surface in the above immersion treatment step in the treatment liquid, a film corresponding to the surface treatment of the material to be treated is also formed on the jig surface. For example, in the electrolytic treatment process such as anodizing treatment or electrolytic coloring treatment, the surface treatment solution is attached, so that the same treatment effect as that performed on the material to be treated, for example, formation of an oxide film or electrolytic deposition occurs, In addition, in a coating process such as electrodeposition coating, the electrodeposition coating film is formed by the adhesion of the resin for the coating film. When the shape of the material to be processed is different for each processing lot, the film is formed on the entire surface of the hanging jig energization surface. For this reason, the hanging jig gradually deteriorates in conductive characteristics and its electrical conductivity deteriorates due to repeated and continuous use thereof. On the other hand, due to repeated immersion of the hanging jig in the treatment bath, the tightening spring may deteriorate, and the hanging holding force of the material to be treated may decrease, resulting in poor gripping.

The deterioration of the hanging jig, that is, the degree of film formation on the surface or the degree of fatigue of the spring for catching the material to be processed in the hanging jig is conventionally determined by a predetermined continuous use period. Each time, the on-site worker visually determines the degree of gloss of the conductive part (for example, copper) of the hanging jig, repairs and repairs the conductive part by polishing, and adjusts the spring tension of the worker. I had to change the spring based on my experience. When the number of times of polishing is increased, the jig becomes unusable and the entire jig is replaced.

[0005]

[Problems to be Solved by the Invention] A conventional inspection method which relies on the visual judgment of a worker on site and the judgment based on empirical intuition to determine the degree of film formation on the surface of the above-mentioned hanging jig and the deterioration of the spring. In that case, it is difficult to accurately determine the presence or absence of abnormalities, and it is overlooked that the oxide film and electrodeposition coating (often using transparent resin as the insulating material) are excessively attached. Or, even if the spring is fatigued, it may be used as it is. If this defective hanging jig is used as it is, the following problems occur. (1) If a hanging jig with an excessively large amount of film adhered to the surface is used, the material to be processed is not energized in a predetermined manner from the conductive bus bar through this hanging jig, and the desired film cannot be formed. Or, depending on the case, heat is generated due to its electric resistance during processing, the holding force of the spring decreases due to temperature rise, the biting force of the hanging jig weakens, and the material to be processed falls in the processing tank. . (2) If the spring is used and the suspension holding force is reduced, the material to be treated will drop even when the material to be treated in the sideways state is lifted from the suspending work table and suspended. (3) If the material to be processed falls in the processing tank, a short circuit accident occurs, and the material to be processed comes into contact with the material to be hung on the conductive bus bar adjacent to the material to be damaged. further,
There is a possibility that the amount of electricity applied to other materials to be processed hung on the same conductive bus bar may change, an appropriate film may not be formed, and all of the same lot may become defective products.

[0006] The present invention shows the conductive characteristics of a suspending jig for suspending and holding a material to be treated, which is to be subjected to electrolytic treatment such as anodizing treatment, electrolytic coloring treatment, and electrodeposition coating, that is, the deterioration state. It is an object of the present invention to provide an inspection method that can be accurately evaluated by using a measuring device without depending on a judgment.

[0007]

In order to achieve the above-mentioned object, the present invention has a conductive detecting member for inspection which is held in one side of a suspending jig to be inspected, and which holds the conductive detecting member for inspection. An electric circuit is formed between the suspension jig and the other side of the suspension jig, the contact resistance between the conductivity detecting member and the suspension jig is measured, and it is determined whether the resistance value exceeds a set value. A method for inspecting the conductive characteristics of a hanging jig for electrolytic surface treatment, which is characterized in that the conductive characteristics of the hanging jig are evaluated. In this case, a plurality of conductivity detecting members are bitten and held on one side of a hanging jig that simultaneously hangs a plurality of workpieces to be inspected, and one of the conductivity detecting members and the other side of the hanging jig are held. It is effective to form an electric circuit between them. Further, if the same material as the material to be processed that is suspended and held by the suspension jig is used as the conductivity detection member, the zero point can be set and a good result can be obtained. Further, in the above method, when the measured resistance value exceeds the set value, it is displayed by the display means, and when the measured resistance value is recorded,
It is more effective in terms of management.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a connection diagram for explaining a method for inspecting a conductive characteristic of a hanging jig according to the present invention.
In the figure, reference numeral 1 is a suspending jig for suspending and holding a material to be processed, which itself is disclosed in Japanese Utility Model Publication No. 3-24605.
It is described in Japanese Utility Model Publication No. 62-36851 and the like, and it is a known one.

The hanging jig 1 fixes a holding rod 12 also serving as a current-carrying bar at a lower portion between the left and right support frames 11, 11 and holds a material to be processed between the holding rod 12 and the holding rod 12. Support frame 11,
A holding claw 13 is pivotally attached to a front end of 11 by a shaft 14 so that the holding claw 13 can be brought into contact with and separated from the front end of the holding rod 12 by an eccentric arc surface. On the upper surface of the holding rod 12, a channel-shaped slider 15 having a groove width for inserting and removing the holding claw 13 is placed so that the groove opening thereof can be moved up and down along the longitudinal direction of the holding rod 12. It is.

The operating lever 17 is composed of a vertical arm 17a and front and rear lateral arms 17b and 17c. The vertical arm 17a has a tip end pivotally mounted in an intermediate groove of the slider 15 and a front portion. The horizontal arm 17b of the link 2 link 2 left and right
One end of each of the links 2 and 22 is pivotally connected by a shaft 23, and
The other end of 2 is pivotally connected to an intermediate portion of the holding claw 13 by a shaft 24.

Spring receiving pins 25, 25 are provided on both sides of the front end of the lateral arm 17b at the front of the operating lever 17, and spring receiving pins 26, 26 are provided on the lower ends of the supporting frames 11, 11 so as to project therefrom. The springs 27 and 27 are connected to the links 22 and 22 between the spring receiving pins 25, 26, 25 and 26 of the springs 27 and 27, respectively.
As a result, the holding claws 13 are constantly repelled in the closing direction in which the holding claws 13 are pressed against the holding rods 12 via the links 22 and 22.

The material to be processed is the material insertion port 16 of the hanging jig 1.
It is forcibly pushed in from and is held by the conductive bus bar while being held between the holding rod 12 and the eccentric arcuate surface of the holding claw 13 having the serrated teeth. When removing the material to be processed from the hanging jig 1, the lateral arm 17c at the rear of the operation lever 17 is spring-loaded.
When pushed to the side of the holding rod 12 against 27, 27, the slider 15 moves forward and the material to be treated is pushed out.

In the present invention, the hanging jig 1
In order to inspect the conductive property of the, the conductive detection member 2 for inspection is bitten and held between the holding rod 12 and the holding claw 13, and the conductive detection member 2 and the holding rod 12 of the hanging jig 1 are held. The electric circuit 3 is formed between the rear end portion (which may be another portion). Then, the measuring circuit 4 is provided in the electric circuit 3.

A contact resistance is generated at the contact portion between the conductivity detecting member 2 and the hanging jig 1. This contact resistance varies greatly depending on the type of film (particularly anodized film) formed on the surface of the hanging jig 1, the degree of film thickness, or the degree of tightening force of the spring of the hanging jig 1. Therefore, the quality is determined by measuring the value with high accuracy and comparing it with the initial setting value according to the electrolytic treatment to be performed.

FIG. 2 is a block diagram of the measuring circuit 4 shown in FIG. The contact resistance between the conductivity detecting member 2 and the hanging jig 1 is measured by a measuring instrument including a voltmeter, and the resistance value is displayed. In this case, as the conductivity detecting member 2,
It is preferable to use a conductive detection member made of aluminum, which is made of the same material as the material to be processed suspended from the suspension jig 1, for example, in the case of surface treatment of an aluminum material, without causing a difference in material resistance. . The measured contact resistance value is compared with a preset reference resistance value to determine whether it exceeds the set value, evaluate the conductive characteristics of the hanging jig 1, and display the determination result. To do. That is, when the measured resistance value is larger than the set value, it is displayed by the display means, for example, by flashing a red lamp or sounding a buzzer. If you record the measured resistance value with a recording means, you can check the judgment result,
More effective.

The set reference resistance value can be changed according to the usage conditions of the hanging jig. That is, the reference resistance value varies depending on the material of the hanging jig, the allowable range of the amount of electricity to the material to be treated, the holding force of the hanging jig, the characteristics of the film formed by the surface treatment, etc. It is set individually according to.

If the measured resistance value exceeds the set value, the hanging jig to be inspected is selected as being defective and needs repair and maintenance, and the material to be processed in the hanging jig is selected. Polish the contact surface to remove the adhered coating, or check the fatigue of the spring of the hanging jig and replace it if necessary.

FIG. 3 is a connection diagram showing another embodiment different from that shown in FIG. In this embodiment, a plurality of workpieces can be suspended and held on a single suspending jig. The hanging jig having a plurality of chuck portions is also a known one as described in Japanese Utility Model Publication No. 60-36381 and the like, and its schematic configuration will be described below.

In the suspension jig 1 ', two legs 32, 32 are branched and extended from the end of the base 31 at a predetermined interval, and each leg 32,
32 are arranged at a predetermined interval in the front-rear direction, and each leg 3
Chuck parts 33, 3 that should hold the material to be processed at the tips of 2, 32
3 is provided, and each operation lever 34, 3 that opens and closes this chuck part
4 is extended. Then, the upper operation lever and the lower operation lever are connected by a link mechanism, and when one operation lever is swung, the other operation lever is also swung so that the lower ends of the legs 32, 32 are Two workpieces can be chucked to chuck portions 33, 33, which are composed of frame 35 fixed to each leg 32, 32 and cams 36 pivoted on frame 35.

In this embodiment, both chuck portions 3 described above are used.
Conductivity detecting members 2'and 2'for inspection are respectively bitten and held in 3, 33, and both conductivity detecting members 2'and 2 '
An electric circuit 3'is formed between any of the 2'and the rear end of the hanging jig 1 '. Then, in this electric circuit 3 ', as shown in FIG.
The measurement circuit 4 is provided as in the above embodiment. The electric circuit 3'is provided with a changeover switch 5 so that it can be selectively connected to either of the conductivity detecting members 2'and 2 ', and the changeover switch 5 is changed over manually or on the basis of a relay control signal from the measuring circuit 4. The contact resistances at the plurality of chuck portions 33, 33 of the hanging jig 1'are separately measured. The method of measurement is the same as that of the embodiment shown in FIG. 1, and therefore its explanation is omitted. In this embodiment, for a hanging jig having a plurality of chuck portions on a single hanging jig, the contact resistance of the chuck portions can be sequentially measured.

[0021]

【Example】

[Embodiment 1] Next, an embodiment of the present invention will be further described. As hanging jigs to be inspected, unused and used products (1) through used in the process of anodizing film treatment, nickel bath electrolytic coloring treatment, and acrylic resin electrodeposition coating treatment in an aluminum electrolytic coloring line A used product (3) was prepared, and its conductive property was evaluated by the inspection method shown in FIG. As the conductivity detecting member, JIS A6 made of the same material as the material to be processed that is suspended and held by the suspension jig.
Aluminum extruded shape that is 063 (40 mm x 100 mm x
2 mmt), and this was held between the holding jig holding rod and the holding claw, and the contact resistance between the conductive detection member and the hanging jig was measured. As a comparative example, there is a conventional inspection method in which the quality is determined by a method of visually determining the gloss of the surface of the hanging jig (copper) with which the material to be processed contacts. Table 1 shows the results of the determination.

[0022]

[Table 1]

In the inspection method of the embodiment, among the hanging jigs to be inspected, the unused product and the used product (3) whose measured resistance value is lower than the reference resistance value are passed, and the used product (1 ) And the used product (2) were determined to be defective. On the other hand, in the inspection method of the comparative example, the unused product, the used product (1) and the used product (3) were judged to be the same as those of the example, but the used product (2) was tested. Contrary to the judgment result of the example, the judgment is good. This means that the visual inspection by the operator is unreliable, which means that the inspection method for measuring the contact resistance fails even if it is judged to be good in appearance.

[Embodiment 2] On the other hand, in order to compare the degree of heat generation due to the contact resistance of the hanging jig, as the hanging jig to be inspected, the unused product and the used product (2 ) And an existing product (3) were prepared, a direct current was passed between the conductive detection member and the hanging jig, and the temperature of the biting portion of the hanging jig was measured using an infrared imaging device. as a result,
The unused product was 350 ℃, while the used product (2) was
The temperature reached 580 ℃ and the temperature increased by 230 deg. Compared to the unused product. In contrast, the used product (3) is 460
At ℃, the temperature rose to 110deg.

[0025]

As described above, according to the method for inspecting the conductive characteristics of the hanging jig for electrolytic surface treatment according to the present invention,
Hold the conductive detection member in the holding type hanging jig to be inspected and hold it, and measure the contact resistance between this conductive detection member and the hanging jig to determine whether the resistance value exceeds the set value. The conductive property was evaluated. As a result, as is clear from the results of Example-1, in the conventional visual determination method, it may be overlooked that the oxide film or the electrodeposition coating film is excessively attached, or the spring may be fatigued. Despite being used as it is, it was difficult to accurately determine the presence or absence of an abnormality. Regardless, the conductive characteristics of the hanging jig can be accurately evaluated. Therefore, it is possible to automate the inspection of the hanging jig, which relies on experience in the past, and solve the problem of contact failure. In addition, as shown in Example-2, by grasping the heat generation status of the hanging jig by managing the resistance value and sending the one that may cause the spring deterioration due to abnormal heat generation for maintenance, it can be used repeatedly. Therefore, it is possible to prevent accidents due to the use of the hanging jig whose holding power is lowered. By properly performing the maintenance of the hanging jig, the repair work in view of safety can be optimized, the life can be extended, and uniform film formation on the material to be treated can be expected.

[Brief description of drawings]

FIG. 1 is a connection diagram for explaining an embodiment of a method for inspecting a conductive characteristic of a hanging jig according to the present invention.

FIG. 2 is a block diagram of the measurement circuit shown in FIG.

FIG. 3 is a wiring diagram for explaining another embodiment of the method for inspecting the conductive characteristics of a hanging jig according to the present invention.

[Explanation of symbols]

 1, 1 '... Hanging jig 2, 2' ... Conductivity detection member 3, 3 '... Electric circuit 4 ... Measuring circuit 5 ... Changeover switch

Claims (5)

[Claims] 1. A conductive detecting member for inspection is held in one side of a hanging jig to be inspected, and an electric circuit is formed between the conductive detecting member and the other side of the hanging jig. Then
For electrolytic surface treatment, characterized in that the contact resistance between the conductivity detecting member and the hanging jig is measured, and the conductive characteristic of the hanging jig is evaluated depending on whether or not the resistance value exceeds a set value. Method for inspecting conductive characteristics of hanging jigs. 2. A plurality of conductivity detecting members are bite and held on one side of a hanging jig for simultaneously hanging a plurality of workpieces to be inspected, and any one of the conductivity detecting members and the hanging jig are The method for inspecting the conductive characteristics of a hanging jig for electrolytic surface treatment according to claim 1, wherein an electric circuit is formed between the hanging jig and the side. 3. The electroconductivity of the hanging jig for electrolytic surface treatment according to claim 1, wherein the same material as the material to be treated that is suspended and held by the hanging jig is used as the conductivity detecting member. Characteristic inspection method. 4. The conductive property of the hanging jig for electrolytic surface treatment according to claim 1, wherein when the measured resistance value exceeds a set value, the fact is displayed by a display means. Inspection methods. 5. The method for inspecting the conductive characteristics of a hanging jig for electrolytic surface treatment according to claim 1, wherein the measured resistance value is recorded.