KR20120111854A - Barrel device for barrel plating - Google Patents

Abstract

PURPOSE: A barreling apparatus for barrel plating is provided to reduce electric resistance in plating from a small work piece to a large work piece, thereby reducing the emission of carbon dioxide. CONSTITUTION: A barreling apparatus for barrel plating comprises a negative electrode(11) which is arranged in a position to contact a work piece in a barrel and a positive electrode(12) which is arranged in a position not to contact the work piece in the barrel. The barrel is in an approximately circular or polygonal cylinder shape with a diameter-to-length ratio of 1:0.7-1:1.

Description

Barrel device in barrel plating {BARREL DEVICE FOR BARREL PLATING}

The present invention uses a non-opening barrel, accommodates the work inside the barrel, is immersed in the plating liquid, and energized by the cathode disposed in the barrel and the anode disposed in the plating liquid, while rotating the barrel around the central axis. The present invention relates to a barrel device in barrel plating for plating, and particularly to exhibiting effectiveness as an environmental countermeasure.

In the industrial plating apparatus, constant voltage control is performed to supply electric power from a single rectifier to a plurality of barrels. FIG. 5 shows a typical example of such an electric power supply system, and when the workpieces to be loaded for each barrel are different, the amount of charge should be calculated in advance so as to make the surface area of the workpieces equal in each barrel. However, as apparent from Fig. 5, when the lengths of the wires from the rectifier to the respective barrels are different, electricity tends to flow in the order close to the rectifier. Therefore, the conditions are not exactly the same for all barrels.

Plating is established by Faraday's law, and the amount of material precipitated by electrolysis of the electrolyte solution is proportional to the amount of electricity passing through, and the amount of electricity required to deposit 1 gram equivalent of the material is constant regardless of the type of material. In the galvanizing, if a current of 1.0 A flows for 1 hour in a unit area of 1 dm ² (10 cm x 10 cm = 100 cm ² ), a plated film having a thickness of 17.1 μm is deposited. Although the deposition rate is 0.285 µm / minute, in barrel plating, the plating film is energized when the workpiece is contacted with a current collector (lead wire) called a contact, which is disposed inside the rotating barrel, so that the plating film is precipitated. In many cases, they rely on the skill of workers.

In order to reduce the energy required for the deposition of the plating film, it is necessary to find out the factors influencing the amount of electricity. CO ₂ emissions can be reduced by reducing the total amount of electricity used for the deposition of the plated film. Here, as opening elements to be connected to the CO ₂ emission reduction and the running cost reduction, as described below.

The zinc metal concentration in the barrel decreases with time.

The rotation speed of the barrel affects the deposition amount (film thickness) of the plated film formed on the workpiece surface.

The barrel volume and the surface area of the injected workpiece affect the deposition amount (film thickness) of the plating film.

It is necessary to maintain a constant concentration of zinc metal in the plating bath.

The temperature of the liquid in the plating bath affects the deposition amount (film thickness) of the plating film.

The capacity of the inserted workpiece affects the deposition amount (film thickness) of the plated film.

The surface area of the anode (anode) affects the electrical resistance.

At the time of energization to the electrodes in the barrel, the shape of the contact associated with the energization affects the electrical resistance.

The amount of electricity required for plating film deposition (film thickness) affects the setting of the current density.

The shape of the barrel hole affects the amount of chemicals to be dispensed.

Quantity of pumping medicine affects water supply.

Quantity of pumping medicine affects sludge in drainage treatment.

Water supply affects the drainage process.

As a result of reviewing the plating of the barrel from this viewpoint, the inventor has obtained a certain result for the open barrel, and has applied for a part thereof. However, since the open barrel has an opening portion in the cross section in the direction of the rotation axis of the barrel, and the workpiece is accommodated in the portion defined by the opening diameter and the barrel inner diameter, for example, a long bolt or the like may come out of the opening. This is not appropriate because there are problems such as higher. It is also a matter to consider whether the conveyance system of the barrel is a carrier system (Fig. 5) or an elevator system (Fig. 6). The carrier method is a method in which a conveyance trolley called a carrier processes each step while moving a barrel, and the elevator method raises the process in which the pretreatment tank and the plating tank are arrange | positioned endlessly at a fixed pitch at a fixed time at every pitch- It is a system which processes each process by repeating lateral-falling-immersion. In this carrier system, the diameter D of the barrel is small and the axial length L is large (see Figs. 7A and B), and when such a long barrel is used to plate a small-volume workpiece, the workpieces are formed in the longitudinal direction. It may tend to fall off, causing problems with energization, and plating may not be possible. This problem is more remarkable in small screws such as M2 to M4. However, when these are put into the barrel, the dose is 50 kg and the volume is about 15 l (hereinafter, "l" is liter). On the other hand, such a problem is unlikely to occur because a large screw, such as M16, has a dose of about 100 kg and a volume of about 60 l, and a dose of 50 kg, which has a volume of about 30 l and a volume twice that of a small screw. In addition, an example of an elongated barrel is a normal form in the barrel of a carrier system, as can be seen in Japanese Patent Laid-Open No. 2008-95143.

The present invention has been made after confirming the knowledge that the barrel is made non-open and the length L should be shorter than the long one, and it is assumed that the barrel device is an elevator system. In the elevator system, the barrel is arranged in the direction in which the rotation axis direction coincides with the barrel conveyance direction, and takes the endless movement method surrounding a constant winding path. As a result, the length of the barrel is restricted in a constant pitch (adjacent barrel spacing), but this restriction means that the diameter D is large and the axial length L is small in the form of a barrel (Figs. 8A and B), It is suitable for the present invention. In the barrel, in order for the cathode and the workpiece to stably contact, it is necessary to inject the workpiece with the minimum volume. This is because the length L of the barrel is short and the diameter D is large, so that the conditions of the workpiece input amount are also alleviated. .

Japanese Patent Publication No. 2008-95143

SUMMARY OF THE INVENTION The present invention has been made in view of the above point, and the problem is that by using a non-opening barrel, even long bolts can be plated without problems, and furthermore, the electrical resistance is reduced in the plating of large workpieces from small workpieces. The present invention provides a barrel device for barrel plating that can reduce CO ₂ emissions. Further, other of the present invention, task is to, with can be carried out without application of a fundamental change in the conventional plating apparatus, provides a plating apparatus according to a barrel plating to achieve a CO ₂ emissions reduction and running cost reduction .

MEANS TO SOLVE THE PROBLEM In order to solve the said subject, this invention uses a non-opening barrel, accommodates a workpiece | work inside the barrel, it is immersed in plating liquid, energizes the cathode arrange | positioned inside the barrel, and the anode arrange | positioned in plating liquid, In the barrel plating for electroplating while rotating around the central axis, the barrel is provided with a cathode disposed at a position in contact with the workpiece inside the barrel, and an anode disposed at a position not in contact with the workpiece within the barrel. Means have been devised in the form of a substantially cylindrical or almost polygonal cylindrical shape and the ratio of their diameter and length is in the range of 1: 0.7 to 1: 1.

As mentioned above, this invention presupposes that it is a barrel apparatus in an elevator system. As shown in Fig. 6, the plating apparatus of the elevator system adopts an endless movement system surrounding a constant circumferential path, and repeats pretreatment and plating in a cycle of ascending to descending to descending to immersion (raising or rising). Therefore, even if all the barrels are electrically treated under the same conditions even at the plating liquid concentration, the plating conditions may be considered to be the same. In the non-opening barrel 10 used in the present invention, as shown in Fig. 9, both end faces in the barrel central axis direction are closed, and an opening portion is provided on the circumferential side of the rotating body, and a lid C is provided on the opening portion. ) Is installed. The object of the present invention is to accommodate the workpiece inside the barrel, immerse it in the plating liquid, energize the cathode disposed in the barrel and the anode disposed in the plating liquid, and perform barrel plating while rotating the barrel 10 around the central axis. to be.

The apparatus of the present invention includes a cathode 11 disposed at a position in contact with a workpiece inside the barrel 10 and an anode 12 disposed at a position not in contact with the workpiece W inside the barrel 10. Equipped with. FIG. 8 schematically shows the relationship between the cathode 11, the anode 12, and the workpiece W in the barrel, in which case the barrel 10 rotates counterclockwise with respect to the central axis 13. I assume. That is, in the inside of the barrel 10 to be left-turned, the anode 12 is disposed at the upper and left positions inside the barrel away from the work W with respect to the work W that is deposited on the lower side and the right side thereof. We are looking for ways to do this.

The barrel has an almost cylindrical or nearly polygonal shape, and the ratio of the diameter and the length thereof can be set in the range of 1: 0.7 to 1: 1. 9 schematically shows the ratio of the diameter D and the length L of the barrel 10. In the ratio between the diameter D and the length L, the lower limit of the length is 0.7 because the auxiliary anode easily comes into contact with the workpiece, and when contacted, shortens it, causing the rectifier to break. This is because these risks can be avoided by making them relatively large. Therefore, in the present invention, when the pitch is 900 mm, an example in which the barrel is 580 mm in length and 650 mm in diameter and the ratio is 1: 0.89 is appropriate. However, when increasing the input quantity of a workpiece | work or putting a thing with a long dimension of a workpiece | work, it will design in the direction which enlarges the diameter of a barrel within the range of the ratio of the said diameter and length. In addition, as a diameter of a barrel, when a raw material is made into PVC (vinyl chloride resin) or PP (polypropylene), about 800 mm is a limit. Thus, 1: 0.7 is the proper ratio.

In addition, the anode inside the barrel constitutes an auxiliary anode, and the main anode can be arranged so as to almost follow the circumference of the barrel in the plating bath filled with the plating liquid. In the energization of only the main cathode of the related art disposed outside the barrel, the voltage tends to be slightly higher because the barrel main body interferes with the energization. In the present invention, since the space inside the barrel can be widened in the radial direction, and the auxiliary anode can be installed inside the barrel in the widened space, the effect of lowering the voltage can be expected. The barrel body has a number of barrel holes on its circumferential side. In the present invention, the barrel hole has a long hole shape so that the chemicals easily flow in and out, and the barrel hole can be configured to be inclined with respect to the rotational direction.

Since the present invention is constructed and functioned as described above, long bolts can be plated without problems by using a non-open barrel and the ratio of the diameter and the length to 1: 0.7 to 1: 1. Moreover, the effect which can reduce an electrical resistance in plating of a large workpiece from a small workpiece is shown. In addition, according to the present invention, it is possible to provide a barrel apparatus for barrel plating that can reduce CO ₂ emissions, and to reduce CO ₂ emissions and running costs without making a fundamental change to the existing plating apparatus. Can be achieved.

BRIEF DESCRIPTION OF THE DRAWINGS It is a front view which shows an example of the barrel apparatus in barrel plating which concerns on this invention.
2 is an explanatory side view showing the apparatus.
3 is a plan explanatory view showing a main part of the apparatus.
4 is a graph showing the effect of the present invention.
It is explanatory drawing which shows the typical example of the conventional power supply system.
It is explanatory drawing which shows the plating apparatus of the elevator system which applies this invention.
Fig. 7 shows a conventional non-opening barrel, where A is a side view and B is a front view.
Fig. 8 schematically illustrates the non-opening barrel of the present invention, where A is a side view and B is a front view.
9 shows an example of the non-opening barrel of this invention similarly, A is a side view, B is a front view.

EMBODIMENT OF THE INVENTION Hereinafter, with reference to drawings, embodiment of this invention is described in detail. BRIEF DESCRIPTION OF THE DRAWINGS The front view which shows an example of the barrel apparatus in barrel plating which concerns on this invention, In each figure, 15 is a support | pillar of a barrel plating apparatus, 16 is an elevator, and the elevator 16 guides the support | pillar 15 to a guide rail. In addition, it is installed so that lifting and lowering is possible, and in an elevator system line, it shall be provided so that it may be conveyed in the direction orthogonal to the surface of FIG. 17 and 18 are arms which consist of a pair of left and right members, are attached to the elevator 16 at the base end, and bearing parts 19 and 21 for the barrel rotation shaft are provided at the tip end, respectively. The barrel main body 20 of the barrel apparatus which concerns on this invention is affixed in the suspended state in the part of the bearing parts 19 and 21 of the front-back both ends.

In the example shown in FIGS. 1-3, the barrel main body 20 has the shape of a substantially polygonal cylinder shape, The diameter is 650 mm and the length is 650 mm. Therefore, since the ratio of the diameter and the length of the barrel body 20 is 1: 1, it will be understood that it is in the range of 1: 0.7 to 1: 1. The illustrated barrel body 20 is a polygonal cylindrical shape having a hexagonal cross-sectional shape, and both end surfaces in the barrel central axial direction are closed by end plates 22 and 23, and one side 23 serves as a large gear. . The barrel periphery of the barrel body rotating body has a large number of barrel holes, and an opening portion 24 is formed as an entrance and exit of the work W, and the opening portion 24 is opened and closed by a lid 25. It is possibly installed. Since the shape of the barrel hole affects the amount of chemicals to be dispensed, it is preferable to have a long hole shape (not shown), and to form the inclined direction of the holes so that the chemicals easily flow in and out. Do. As a result of making the diameter of the barrel relatively large, the distance at the time of chemical inflow and outflow becomes long in the radial direction, so that the inflow and outflow of chemicals can be smoothed by making the barrel hole long and inclining the rotation direction.

The barrel device of the present invention includes a pair of left and right cathodes 26 and 26 disposed inside the barrel body 20 and in contact with the workpiece W, and the workpiece W inside the barrel 10. The internal anode 27 arrange | positioned in the position which does not contact () is provided (internal example 27 in this example is corresponded to an auxiliary anode). The cathodes 26 and 26 inside the barrel are attached to the barrel body 20 at the positions of the bearing portions 19 and 21. In addition, in the example of FIG. 1, in the inside of the barrel main body 20 which becomes a right turn, with respect to the workpiece | work W which the lower part also accumulates on the left side, in the upper part and the right position inside the barrel away from the said workpiece W, The internal anode 27 is arranged. In this case, the barrel main body 20 assumes clockwise rotation with respect to the central axis. In addition, 26a shows a negative electrode lead wire (refer FIG. 1 and FIG. 3).

The inner anode 27 has a long rectangular shape and the plate surface does not contact the workpiece at the time of rotation and at the time of feeding in the direction in which the longitudinal direction thereof is parallel to the central axis direction of the barrel body 20. Rather, it is inclined toward the work side so as to face the work on the left side in the rotational direction. In this manner, the bracket 28 is bolted to the front and rear bearing portions 19 and 21 at both ends in the barrel body, and the internal anode 27 is attached to the bracket 28 (see FIGS. 2 and 3). ). The bracket 28 serves as a part of the energizing member, and the lead members 29 and 31 for the internal anode are fastened together by bolts fixing both ends thereof, whereby the attachment of the member and the securing of the energizing path are secured. consist of. Wiring from an energization path outside of the drawing is connected to the lead members 29 and 31.

In order to rotate the barrel main body 20, a drive mechanism 30 is provided. The drive mechanism 30 includes the motor 32 installed on the hanger arm base, the pinions 33 and 34, the intermediate shaft 36 coupled to the motor 32 by the chain 35, and the intermediate shaft 36. It has the reduction gears 37 and 38 of the other end of (), and drives the large gear 23a provided in the outer periphery of the reduction gear 38 and the said end plate 23. As shown in FIG. In addition, the other end 26b of the cathode lead wire 26a is connected to the sliding mechanism 39, so that power can be supplied while moving.

In the barrel apparatus in the illustrated example, the anode inside the barrel constitutes an auxiliary anode, and the main anode 41 is disposed so as to almost follow the circumference of the barrel in the plating bath 40 filled with the plating liquid. Has The main anode 41 is provided with the part 41a which arrange | positioned so that it may be enclosed from the barrel outer side with respect to the workpiece | work W deposited on the left side, and the part 41b arrange | positioned outside the inner anode 27. . 41a of these two parts is provided so that it may be easy to supply electricity to the workpiece | work W deposited on the left side by barrel rotation, and 41b is provided in order to make an anode area larger. In particular, the three anodes 27, 41a, and 41b are arranged so as to surround the work W that is deposited on the left side, whereby the current is easily flowed. In the figure, 42a, 42b is a lead member for positive electrodes, and is connected with the wiring from the electricity supply path out of the figure. 43 represents the plating bath expectation.

<Plating test>

Since the plating test by zinc plating was performed using the barrel plating apparatus comprised as mentioned above, the content and a result are demonstrated next.

<Contents of plating examination>

Test process: Acid wash (using hydrochloric acid with a concentration of 35%, 15 minutes at room temperature) → alkali electrolysis (using an electrolyte generally used for zinc plating, 5 minutes at room temperature) → temporary rust prevention (caustic soda with a concentration of 1%) Use, 1 minute at room temperature) → plating (according to the conditions in Table 1 below) → post-treatment (using chromate treated material, pH 2.4, 30 ° C. for 30 seconds).

The workpiece used for the plating was a tapping screw of M4 × 12, the barrel loading amount 40kg, the surface area 25.Odm ₂ / kg, the total surface area 1000dm ₂ , the plating liquid Zn13g / l, NaOH 130g / l, NaCO ₃ 30g / l, and others As a brightening agent, 2 ml / l of M3 and 0.3 ml / l of B were used.

<Result of plating test>

According to Table 2, it is understood that the average film thickness of 8.34 µm in the case of the presence of the auxiliary anode corresponds to an increase of 11.6% with respect to the average thickness of 7.17 µm in the case of not using the auxiliary anode, and a remarkable effect was obtained. This result is shown in the graph of FIG. 4, and the peak of the film thickness with the auxiliary anode is almost 8 μm, whereas the peak of the film thickness without the auxiliary anode is less than 7 μm, and the numerical value of Table 2 is shown. And the difference is significant.

The barrel of the barrel plating apparatus according to the present invention, since it is possible to perform the coating as described above, to shorten the plating time, which would reduce the amount of electricity can be possible, and reduce the CO ₂ emissions as a result.

In the said embodiment, the case where the barrel apparatus in barrel plating of this invention was applied to zinc plating was demonstrated. However, zinc plating is adopted as a typical example of plating to the last, and needless to say, the present invention is not limited only to zinc plating.

10: Barrel shown schematically
11: cathode
12: anode
13: central axis
15: prop
16: lift
17, 18: hanger arm
19, 21: bearing
20: barrel body
22, 23: single plate
24: opening part
25: cover
26: cathode
27: internal anode
28: bracket
29, 31: lead member
30: drive mechanism
32: motor
33, 34: Pinion
35: chain
36: intermediate axis
37, 38: reduction gear
39: big gear
40: plating bath
41: main anode

Claims (3)

A barrel which uses an unopened barrel, accommodates a work inside the barrel, is immersed in the plating liquid, and energizes the cathode disposed in the barrel and the anode disposed in the plating liquid, and performs electroplating while rotating the barrel around the central axis. In plating,
A cathode disposed at a position in contact with the work inside the barrel,
An anode disposed at a position not in contact with the workpiece inside the barrel,
The barrel device has a form of a substantially cylindrical or almost polygonal cylindrical shape, and the ratio of the diameter and the length thereof is in the range of 1: 0.7 to 1: 1. The method according to claim 1,
The barrel apparatus in barrel plating which has the structure which the anode inside a barrel comprises the auxiliary anode, and arrange | positioned the main anode almost in the circumference | surroundings of the plating tank which filled the plating liquid. The method according to claim 1,
The barrel body has a plurality of barrel holes on the circumferential side thereof, and the barrel hole has a long hole shape so that chemicals easily flow in and out, and the barrel hole is inclined with respect to the rotational direction. The barrel apparatus in barrel plating provided.

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