JPH0514798B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention includes degreasing and other pretreatment of workpieces (workpieces), especially fine workpieces, barrel plating, water washing, drying, and further chromate treatment. This invention relates to a barrel for barrel plating used in a series of barrel plating processes.

[Prior art] Originally, barrels for barrel plating processes are roughly divided into horizontal rotation type and tilted rotation type depending on the direction of the rotation axis, but due to their large processing capacity and ease of automation, etc. The former is widely used. Such a horizontally rotating type generally has openings at both ends on the axis of rotation for insertion of the cathode part, and
It is widely known to have a cylindrical body having a side wall with a large number of perforations for the circulation of plating solution, supply of electrolytic current, and drainage, and an opening/closing part for loading and unloading of the workpiece.

When barrel plating using the above barrel,
The barrel containing the workpiece is immersed in the plating bath with its axis of rotation horizontal, and rotated or rocked, and the cathode inserted through the opening so as to make electrical contact with the workpiece inside. A method is adopted in which current is passed between the plating bath and an anode disposed along the side wall of the barrel in the plating bath.

However, in the conventional horizontally rotating barrel as described above, (a) the flow of plating solution and the supply of electrolytic current are carried out through numerous perforations in the side wall, which leads to an imbalance in the bath composition inside and outside the barrel; (b) It is necessary to open and close the opening/closing part to take in and out the workpiece, which leads to a decrease in productivity and makes it difficult to introduce consistent automation and robotization of the barrel plating process. (c) Workpieces tend to get clogged or remain in the opening/closing part, which becomes foreign matter and gets mixed into the next lot, causing defects. (d) A large amount of washing is required when washing the workpieces in the barrel with water. (e) When drying the workpiece, it is necessary to transfer the workpiece inside the barrel to a centrifugal dryer, etc., resulting in a decrease in productivity. At the same time, there were problems such as preventing the introduction of automation and robotization of a series of barrel plating processes.

In order to solve the above-mentioned problems, the present inventor has recently developed a method for inserting a cathode section at both ends on the rotation axis, moving the workpiece in and out, and plating the workpiece, as shown in Japanese Patent Application Laid-Open No. 60-059100. We are developing a barrel for the barrel plating process, which consists of an empty body with openings for liquid flow and supply of electrolytic current, and a perforation on the side wall for draining water.

When barrel plating using this barrel,
The barrel loaded with the workpiece is immersed in the plating bath and rotated or rocked so that the axis of rotation passing through both openings is substantially horizontal, and electrical contact is made with the workpiece inside from the opening. A method is adopted in which electricity is supplied between the cathode section inserted in such a manner and an anode section disposed in the plating bath so as to face both openings. Further, in the barrel improved in this way, the barrel is tilted and the workpiece is carried out through the downwardly directed opening.

[Problem to be solved by the invention]

However, with conventional horizontal rotating barrels, including the improved barrels as described above, when processing particularly fine workpieces, some of the workpieces may fit into the perforations in the side walls and become clogged. There were problems in that some workpieces were not sufficiently plated, and that clogged workpieces remained as they were and mixed into the workpieces of the next lot, resulting in defects.

Regarding fine workpieces, in recent years, products such as electrical and electronic products have become lighter, thinner and shorter, and as a result, the screws, screws, and other mating parts that are incorporated into these products have become smaller and lighter. Also, as mentioned above, the conventional horizontal rotating barrel cannot easily handle the situation.

The main object of the present invention is to provide a barrel for a barrel plating process that can prevent the problem of defects caused by the workpieces clogging the perforations in the barrel side wall when processing particularly fine workpieces. It is in. Furthermore, another object of the present invention is to provide a barrel for barrel plating process that enables effective drainage of water after processing the workpiece.

[Means to solve the problem]

In order to solve the above problems, the barrel for barrel plating process according to the present invention is a horizontally rotating barrel for barrel plating process, and includes at least insertion of a cathode section, insertion and removal of a workpiece, and It has openings for the circulation of plating solution, supply of electrolytic current, and drainage after processing, and is characterized by having a side wall without perforations and having a porous cover over one opening.

[Effect]

After a workpiece is introduced into the barrel through its opening, it is immersed in a plating bath so that its rotational axis is horizontal, and then rotated or swung around its rotational axis by a motor or the like. It will be done. Further, the cathode part is inserted through the opening so as to be in contact with the workpiece inside, while the anode part is arranged so as to face both the openings, and electricity is applied between the two electrodes to perform barrel plating.

In the above-mentioned barrel plating, since the plating solution flows and the electrolytic current is supplied exclusively through both openings, there is no need for a hole in the side wall as in the conventional case. Furthermore, since there is no such perforation in the side wall, there is no problem of clogging of fine workpieces. In addition, in order to enable smoother distribution of plating solution and supply of electrolytic current, the gap between both openings should be shortened to the extent that the structure allows, the barrel itself should be made smaller, and the opening should be made smaller relative to the barrel diameter. It is preferable to take a large part. The overall shape of the barrel is cylindrical, tapering from the center to both ends, in order to facilitate the loading and unloading of workpieces and to ensure that the loaded workpieces roll smoothly and are stably held inside. A shaped body or a rectangular cylindrical body is preferable.

When draining water from a workpiece, it is sufficient to tilt the barrel so that the opening with the porous cover faces downward, and drain the water through that opening and the porous cover.In that case, even if the barrel is tilted, the workpiece inside will not drain. It will not spill outside.

Such a porous cover has holes or slits large enough to prevent the workpiece from passing through;
The material may be selected as appropriate from among materials that do not interfere with the flow of the plating liquid or the supply of electrolytic current. A cloth material having a stitch or weave smaller than the workpiece, particularly preferably a net material having a mesh smaller than the workpiece, can be used.

The porous cover should preferably cover the entire opening, but even if a part of the opening is left uncovered, the barrel should be placed so that the exposed part is at the top when draining water. At the same time, it can be used satisfactorily by adjusting the inclination of the barrel so that the workpiece does not spill out from the exposed part. In that case, during barrel plating, even if a porous cover is used, which has a slightly poor distribution of plating solution, the exposed openings mentioned above will promote the distribution of plating solution, and the porous cover will allow the plating solution to flow. It is also possible to compensate for the lack of sex.

Furthermore, the above-mentioned porous cover is detachable from the opening so that the most suitable one can be selected depending on the type and size of the workpiece to be processed, and it can be easily replaced with a new one in the event of damage. It is preferable that

In addition, in the present invention, means for rotating the barrel around its rotation axis, loading/unloading of the work,
There is no particular limitation on the means for moving or tilting the barrel for draining water, etc., and for example, known means can be used.

〔Example〕

FIG. 1 is a cross-sectional view of essential parts of an example of a barrel for barrel plating process according to the present invention. In the figure, a barrel 1 includes a central cylindrical portion 2 and frusto-conical cylindrical portions 3a extending on both sides of the central cylindrical portion 2. , 3b, and has no perforations in its side walls, wide openings 4a and 4b are provided at both ends, and one opening 4a has porous holes made of net material. A sex cover 5 is detachably attached.

A driven gear 6 is attached to the outer circumference of the truncated conical cylindrical portion 3a, and baffle plates 7 are protruded from the inner wall of the cylindrical portion 2 at appropriate intervals, and minute workpieces 8 are inserted into the barrel through the opening 4b. has already been introduced from the pre-processing stage.

The barrel 1 is rotatably supported horizontally by left and right brackets 9a, 9b near the tops of its truncated conical cylinders 3a, 3b, and these brackets 9a, 9b are connected to a frame 10, and the connecting portions on both sides thereof An intermediate shaft 12 having an intermediate gear 11 that meshes with the driven gear 6 of the barrel 1 is rotatably supported horizontally on the frame 10, and at the center of the upper end of the frame 10 is an annular hook 13 for lifting and moving the barrel 1. Further, two parallel shafts 14, 14 are attached to the frame 10 and penetrate in the horizontal direction on both sides thereof. Also, a gear motor 1 is attached to the frame 10.
5 is installed, and its main drive gear 16 is an intermediate gear 11
It meshes with. Shaft 14, 14 plating tank 1
The plating bath 1 is hung on the upper edge of the barrel 1 to a depth of about two-thirds thereof.
Immerse it in 8. Further, U-shaped hooks 19, 19 are attached to both ends of the shafts 14, 14, respectively.

Further, a cathode part 20 is inserted into the barrel 1 through the opening 4b so as to be in electrical contact with the workpiece 8, and into the dazzling bath 18 so as to face the openings 4a and 4b of the barrel 1. That is, the anode portions 21, 21 are arranged perpendicular to the axis of rotation.

In the above configuration, the gear motor 15 is started to rotate the barrel 1, and the opening 4 is opened as necessary.
Good barrel plating is performed by supplying current between the cathode section 20 and anode sections 21, 21 while forcibly circulating or injecting the plating solution through a and 4b. The baffle plate 7 promotes good rolling of the workpiece 8 within the barrel 1 as the barrel 1 rotates.

Next, when draining the processed work 8,
By hooking a lifting shaft (not shown) onto the U-shaped hooks 19, 19 on the opening 4b side and pulling it upward, the opening 4b becomes the opening 4a.
water can be drained through the opening 4a and the porous cover 5, which are directed downward.

In addition, when carrying out the workpiece 8 from the barrel 1, by hooking the lifting shaft to the U-shaped hooks 19, 19 on the opening 4a side and pulling it upward, it is possible to remove the workpiece 8 from the opening. The portion 4a rises relative to the opening 4b, and the workpiece 8 can be carried out through the downwardly directed opening 4b.

Note that the same barrel operation as described above can be used in processes other than barrel plating in a series of barrel plating processes.

〔Effect of the invention〕

As described above, the barrel for the barrel plating process according to the present invention does not have any perforations in the side wall unlike the conventional ones, and it is not only possible to insert the cathode part but also to take in and out the workpiece.
The distribution of plating solution, the supply of electrolytic current, and even the draining of water after processing are all performed through large openings at both ends, and the draining is effectively done through a porous cover to prevent the workpiece from spilling outside. It will be done.

Therefore, the barrel according to the present invention can be manufactured at a much lower cost than conventional barrels, and is easier to maintain.
Furthermore, in the present invention, when processing particularly fine workpieces, it is possible to prevent the problem of defects caused by the workpieces clogging the perforations in the barrel side wall.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part of an example of a barrel for a barrel plating process according to the present invention. (Explanation of symbols) 1... Barrel, 4a... Opening,
4b... opening, 5... porous cover, 6... driven gear, 8... workpiece, 11... intermediate gear, 15... gear motor, 16... main drive gear, 17... plating tank, 18...
Plating bath, 20...cathode part, 21... anode part.

Claims (1)

[Scope of Claims] 1. In a barrel for a horizontally rotating barrel plating process, at least the insertion of a cathode part, the insertion and removal of a workpiece, the distribution of a plating solution, the supply of electrolytic current, and the draining after processing at both ends on the axis of rotation. has an opening for
A barrel for a barrel plating process, characterized in that it has a side wall without perforations and a porous cover on one opening. 2. The barrel for barrel plating process according to claim 1, which has a tapered shape from the center to both ends. 3. The barrel for barrel plating process according to claim 1, wherein the porous cover is removably attached to the opening. 4. The barrel for barrel plating process according to claim 1, wherein the porous cover is made of a net material. 5. The barrel for barrel plating process according to claim 1, wherein the porous cover is provided so as to partially expose the porous cover to the opening.