JP4926592B2 - Manufacturing method of coated product - Google Patents

Description

  The present invention relates to a method and a coating apparatus for manufacturing a coated product by applying a liquid medicine to a workpiece. In particular, a new method and coating suitable for producing coated products (semi-finished products) by applying rust-preventive oil to metal parts such as cast products before cutting (castings for cutting), forged materials, press materials, etc. It is an invention related to the apparatus.

  Here, description will be made by taking a casting for machining as an example, but the present invention is not limited to this.

  Castings for machining used as machine component materials and automotive component materials are rusted during storage. For this reason, a rust preventive oil is normally apply | coated to the casting (work) for cutting (refer patent document 1 paragraph 0007 grade | etc.,).

  And application | coating of antirust oil was generally performed by means, such as immersion and a spray. However, the surface of the casting material has many irregularities (particularly corners), and it has been difficult to apply uniformly (see Patent Document 1, paragraph 0003, etc.).

  In particular, in the case of oiliness (including O / W emulsion), it has been said that uniform coating on a workpiece is difficult by a normal coating method. In order to ensure a complete rust preventive oil application effect, it was necessary to apply thickly or overcoat.

  For this reason, excessive application of rust-preventing oil adversely affects handling and workability in subsequent cutting and the like, leading to a large consumption of rust-preventing oil. In the case of spray application, mist (dispersed liquid aerosol: mist) generated by spray application is scattered, requiring special measures to prevent workers from sucking.

Although not affecting the patentability of the present invention, the following Patent Documents 1 and 2 and the like exist as prior art documents related to the anticorrosive coating film of the casting for cutting.
JP-A-6-15225 Japanese Patent Laid-Open No. 10-425

  In view of the above, the present invention is suitable for a method for manufacturing a coated product and an oily chemical solution capable of forming a coating film that is as thin and thin as possible with an oily chemical solution such as rust preventive oil on a workpiece having irregularities. Another object is to provide a continuous coating apparatus.

  Another object (problem) of the present invention is to provide a method for producing a coated product and a continuous coating apparatus suitable for an oily chemical solution that can contribute to the improvement of the coating work environment together with the above object (problem). .

  The manufacturing method of the coated product of this invention solves the said subject with the following structure.

A method for producing a coated product by applying an oily chemical to a workpiece,
While transporting the work by a perforated conveyor that does not substantially cause air pressure loss,
After wetting the perforated conveyor and workpiece with the oily chemical,
The air curtain heading toward the perforated conveyor is sprayed to cut the workpiece and to make the oily chemical liquid mist.

  Thickness that results in the work drip-cut by the air curtain passing through the mist chemical solution, so that excess adhered chemical solution is removed and at the same time the chemical solution adheres to the poorly adhered part due to mist and dripping of the liquid chemical solution occurs. A coated product (rust-preventive oil coated product) having a uniform and thin film coating can be produced without the occurrence of a coating portion.

  In the manufacturing method of the coated product, it is preferable that the wetting is performed by dropping from above and jetting from below. The amount of wetting (oil-based chemical solution) can be easily adjusted as compared with the case where a perforated conveyor or workpiece is immersed and wetted.

  In the manufacturing method of the coated product, wetting and misting of the oily chemical is performed in the closed first and second processing chambers in which the loading / unloading port of the workpiece is opened only when loading / unloading, and the wetting and It is desirable that a surplus chemical solution (including a mist state) generated by the dripping is recovered by dropping it by its own weight (free fall) and circulating for use in the wetting. As a result, the excess oily chemical solution that has not been used is recycled without being diffused, which contributes to the improvement of the working environment.

In the above-described configuration, it is preferable that a jacket chamber is formed over the first and second processing chambers, and mist recovery is performed through the jacket chamber . The diffusion of mist generated in the first and second processing chambers to the outside of the system can be reliably prevented, and further contributes to the improvement of the working environment.

  It is preferable that the method for producing a coated product having the above-described configuration is applied to the production of a rust-preventive oil-coated product for metal parts because the effect of the present invention is remarkable.

  The structure of the continuous coating apparatus for workpieces suitable for the manufacturing method of the coated products having the above-described structures is as follows.

A continuous application device for continuously applying a coating liquid to a work (object to be coated),
A net-type conveyor for transferring workpieces, and a first processing chamber and a second processing chamber arranged along the workpiece transfer direction so that the workpiece transfer surface of the conveyor penetrates,
In the first processing chamber, a dripping nozzle and / or a spray nozzle (spray nozzle) heading toward the conveyor connected to the coating liquid supply pipe are provided,
The second processing chamber includes a slit nozzle capable of forming an air curtain toward the conveyor, and
The loading / unloading port of each workpiece in the first and second processing chambers is closed with a curtain through which the workpiece on the conveyor can pass,
A coating liquid tank is provided opposite the lower opening of the first and second processing chambers, and the coating liquid tank is connected to the coating liquid supply pipe through a pump so as to be circulated.

  It is preferable that the continuous coating apparatus for a workpiece having the above-described configuration is configured such that a jacket chamber is formed outside the first and second processing chambers, and the jacket chamber is connected to a mist collector. Contribute by improving the working environment.

  It is desirable that the continuous coating apparatus of the present invention is applied to a coating apparatus for an oily chemical solution (for example, oily rust preventive oil) because the effect of the present invention is remarkable.

  (A) Hereinafter, the rust preventive oil continuous coating apparatus which is one embodiment of the present invention will be described.

  Basically, it is a continuous coating treatment device for continuously applying rust preventive oil to a cast product (workpiece) W. In the present embodiment, a cast product before cutting is taken as an example of the workpiece, and an oil-based rust-proof oil (oil-based chemical solution) is taken as an example of the rust-proof oil.

  A net type conveyor 12 and a closed first processing chamber 14 and a second processing chamber 16 disposed above the transfer surface 18 of the net type conveyor 12 are provided.

Here, the net-type conveyor (perforated conveyor) 12 has an opening ratio that allows oil-based rust preventive oil that has wetted the conveyor 12 (attached to the conveyor 12) to be misted by air injection from below. There is no particular limitation as long as it is. The perforated conveyor 12 is normally assumed to have substantially no air pressure loss, and a net type conveyor can be typically used. Specifically, an aperture ratio of 30 to 90%, preferably 60 to 80% is used. The aperture ratio by the air curtain is too low, wet the conveyor or the like is (adherent) mist of anti-rust oil is difficult, is difficult to secure the strength for the aperture ratio is too high work transfer.

  Specifically, the drive chains 20 and 20 are attached to both sides of the wire net 18 and the total length is made endless. The front and rear wheels (consisting of an integrally rotating sprocket 24a and drum 24b; the same applies hereinafter) 24, 24A, an intermediate wheel 25, and a tension wheel 25A are attached to the front and rear and middle of the frame 22 perpendicularly to the conveyance direction and horizontally. The chain 20 is engaged with each of the sprockets 24a,. The rotating shaft of the driving side (front side) wheel 24 is connected to the output shaft of the geared motor (electric motor) 27. Then, the net type conveyor 12 is operated by starting the geared motor 27. The chain tension is adjusted manually with an adjusting bolt (not shown).

  In the first processing chamber 14, antirust oil spray pipes (antirust oil supply means) 30 and 30 </ b> A are arranged above and below a wire net (conveying surface) 18 of the net type conveyor 12.

  In the present embodiment, the rust preventive oil spray pipes 30 and 30A are formed by forming a plurality of spray nozzles 30b in parallel at a predetermined pitch on the pipe 30a. When using a dedicated machine for oil-based rust preventive oil, the upper rust oil spray pipe need not be a spray pipe, and may be a rust preventive oil dripping pipe.

  These antirust oil spray pipes 30 and 30A are connected via an oil supply (circulation) pipe 36 provided with an antirust oil tank 32 and a circulation pump 34. Moreover, the upper part of the rust preventive oil tank 32 is open, and the excess rust preventive oil after spraying can be recovered by free or self-weight fall. In addition, the drain part 38 is provided in the bottom part of the antirust oil tank 32, and the oil quantity gauge 40 is attached to the side part.

  In the second processing chamber 16, air injection pipes 42 are arranged above and below the wire net (conveying surface) 18. Each air injection pipe 42 is connected to a ring blower (air supply means: gas transporter) 44 disposed above the second processing chamber 16 via a blower duct 46.

  In the present embodiment, the air injection pipe 42 includes a slit (flat) nozzle 42b along the generatrix of the pipe 42a in the pipe 42a, and can form an air curtain during air injection.

  In the second processing chamber 16, the air curtain (air blow) formed by the slit nozzle has a drip-cutting action for removing excessive adhesion portions such as a liquid pool based on the corners (dents) on the work W, and a wire The net 18 and the work W are wetted (attached), and the effect of mist-forming the rust preventive oil is achieved. When the workpiece W passes through the mist, the rust-preventing oil adheres to the portion where the rust-preventing oil adhesion is poor, and a uniform rust-preventing oil thin film is formed on the workpiece W.

  Here, the positions of the air injection pipes (air curtain forming means) 42 and 42A and the direction of the air injection are changed from the viewpoint of dropping / misting. That is, the nozzle direction of the upper air injection pipe 42 is directly below (vertical), but the lower air injection pipe 42A is positioned closer to the workpiece conveyance direction than the upper one, and in the conveyance direction of the slit nozzle 42b. It is arranged with a predetermined elevation angle so as to face each other.

  However, the position, orientation, and shape of the air injection nozzle may vary depending on the product and the type of rust preventive oil. For this reason, although not shown, it is desirable that the optimum position and direction can be manually adjusted.

  In the present embodiment, the first processing chamber 14 and the second processing chamber 16 are separated independent chambers arranged in the workpiece conveyance direction (may be continuous independent chambers having only partition walls). That is, the workpiece entrance / exit immediately above the wire net (conveying surface) 18 is closed by a deflectable slit curtain 48. Further, since the first processing chamber 14 and the second processing chamber 16 are continuous, the boundary between the first processing chamber 14 and the second processing chamber 16 is closed by a single slit curtain 48.

  In the illustrated example, the slit curtain (flexible curtain) 48 is made of a rubber plate and formed with a large number of slits. However, the slit curtain (flexible curtain) 48 is limited to the slit curtain as long as the workpiece moving on the conveying surface 18 can pass smoothly. Absent. That is, there is no problem even with a flexible curtain or even an air curtain as long as the mist can be prevented from escaping to the outside (outside the machine).

Furthermore, a jacket box 50 that forms a covering space layer (jacket chamber) 51 covering the periphery and upper part of the first processing chamber 14 and the second processing chamber 16 is disposed , and the mist is placed on the jacket box 50. A collector (collector) 52 is provided. The mist collector 52 can collect mist with a filter, and can be replaced when the filter is clogged.

  An oil pan 54 is disposed below the rust preventive oil tank (chemical solution tank) 32. The oil pan 54 receives rust preventive oil leaked out of the apparatus due to oil leakage from the apparatus section, and prevents the oil from flowing out to the floor surface.

  Further, the processing number can be automatically counted by the photoelectric sensor 56 at the product discharge position of the apparatus.

  The first processing chamber 14, the second processing chamber 16, and the jacket box 50 have side walls (front and rear walls) each provided with a closure lid (not shown) made of a transparent plate, and sprayed with rust preventive oil. The mist state can be observed, and the nozzle angle and nozzle can be changed.

  (B) Next, the manufacturing method of the coated product (oil-based antirust oil coating film formation product) using the said apparatus is demonstrated.

  As a preparatory step, a predetermined amount of rust preventive oil is put into the rust preventive oil tank 32.

  1) Start the net type conveyor (perforated conveyor) 12 for conveying the workpiece.

2) Start circulation pump 34 to adjust the amount of injected oil. What is necessary is just to be able to be dripped, and the pump discharge pressure is usually in the range of 0.01 to 0.8 MPa. In addition, although the dripping amount per 1 m < ² > of wire-based oil-based rust preventive oil in this case changes according to the kind of rust preventive oil and a workpiece | work, it is 10-100 g, for example.

  3) Start the blower (gas transporter) 44 and adjust the air volume. Usually, the nozzle discharge pressure is in the range of 5 to 30 kpa.

  4) Start the mist collector 52 and check the filter for clogging.

  5) A cast product (work) W is placed on the net type conveyor 12 and carried into the work device. Then, in the 1st processing chamber 14, the wire net 18 and the workpiece | work W are wetted with antirust oil. Further, in the second processing chamber 16, the work W is dropped by the air curtain and the rust preventive oil is made mist, so that the work is exposed to the mist atmosphere. That is, by dripping, the excess rust preventive oil is removed at the excessive adhesion site, and the misted rust preventive oil is adhered at the poor adhesion site to form a uniform, thin-walled rust oil coating. The Then, the workpiece W is carried out of the apparatus while counting the number via the photoelectric sensor 56.

  6) The rust preventive oil is stored in the rust preventive oil tank 32, and from the rust preventive oil spray pipe (rust preventive oil supply means) 30 from the rust preventive oil tank 32 through the oil supply pipe 36 by the circulation pump 34. The wire net 18 and the workpiece W are wetted by being sprayed. And the excessive rust preventive oil which does not adhere to the wire net | network 18 and a workpiece | work falls, and is collect | recovered with the rust preventive oil tank 32, and is circulated and used.

7) The rust preventive oil mist generated in the first treatment chamber 14 and the second treatment chamber 16 of the rust preventive oil is formed on the outer periphery formed by the jacket box 50 covered over the first and second treatment chambers 14 and 16. It is sucked and collected by the mist collector 52 through the duct from the jacket chamber 51 and released to the atmosphere. When sucked directly from the second processing chamber 16, the mist is diluted and it becomes difficult to form a uniform and thin oil film on the workpiece surface by the mist.

  (C) In the above configuration, it is conceivable to collect the mist directly from the second processing chamber where the mist is formed through the mist duct, but the mist concentration becomes dilute and the predetermined rust preventive oil film thickness is increased. There is a possibility that it cannot be formed on the workpiece.

  Further, instead of the wire net of the net type conveyor, punching metal may be used as long as the strength can be ensured and wetted.

  In the above description, the case where the rust preventive oil is oily has been described as an example. However, when the rust preventive oil is aqueous and the apparatus of the present invention is used, the following is obtained.

With a high discharge pressure of the circulation pump 34, a large amount of antirust oil is injected from the upper and lower antirust oil supply pipes 30 and 30A, and a sufficient amount of antirust is applied to the workpiece W in the first processing chamber 14. After applying the rust oil, the aqueous rust preventive oil excessively attached to the workpiece W in the second processing chamber 16 is dropped by an air curtain formed by the upper and lower air injection pipes 42 to form a uniform thin film coating film. Form a coated product. In this case, the spray amount (injection amount) per 1 m ² of the water-based anti-rust oil varies depending on the type of the anti-rust oil / work, but is, for example, 200 to 1000 g.

  (D) Next, one specification of the rust preventive oil continuous coating apparatus in the embodiment will be described below.

Processing capacity: 550 to 900 / h
Work processing dimension (maximum): width 250mm / height 100mm
Conveyor speed: 3-6m / min
Antirust oil circulation pump discharge pressure: 0.2-0.5MPa
Blower discharge pressure: 6 to 27 MPa
Antirust oil tank capacity: Max 150L

It is a front fragmentary sectional view which shows an example of the antirust oil continuous application apparatus which is an example of an apparatus for this invention. FIG. 2 is a schematic partial sectional view taken along line 2-2 in FIG. 1. FIG. 3 is a schematic partial cross-sectional view taken along line 3-3 in FIG. 1. FIG. 4 is a schematic partial sectional view taken along line 4-4 of FIG.

Explanation of symbols

12 Net type conveyor (perforated conveyor)
14 First treatment chamber 16 Second treatment chamber 30 Antirust oil spray (spray) pipe 32 Antirust oil tank (oil chemical tank)
35 Blower (Gas Transporter)
36 Antirust oil supply (circulation) pipe 50 Jacket box 52 Mist collector

Claims (7)

A method for producing a coated product by applying an oily chemical to a workpiece,
While transporting the work by a perforated conveyor that does not substantially cause air pressure loss,
After wetting the perforated conveyor and workpiece with the oily chemical,
In the method of spraying an air curtain toward the perforated conveyor to make the oily chemical liquid mist while performing the drip cutting of the workpiece ,
The wetting of the oily chemical and the dropping / misting are performed in the substantially closed first and second processing chambers in which the loading / unloading opening of the workpiece is opened only when loading / unloading. The excess chemical solution (including mist state) generated by the dripping is collected by dropping its own weight, and is used for circulation to the wetting .
A method for producing a coated product, characterized in that:   The method for producing a coated product according to claim 1, wherein the wetting is performed by dropping from above and jetting from below. The method for producing a coated product according to claim 1, further comprising forming a jacket chamber over the first and second processing chambers, and performing mist collection through the jacket chamber . A method for producing a rust-preventive oil-coated metal part, comprising producing a rust-preventive oil-coated product of a metal part using the method for producing a coated product according to any one of claims 1 to 3 . A continuous application device for continuously applying a coating liquid to a work (object to be coated),
Comprising a perforated conveyor for conveying the workpiece, as the workpiece conveying surface of the perforated conveyor passes, a first processing chamber and the second process chamber which is disposed along the conveying direction of the workpiece,
In the first processing chamber, a dripping nozzle and / or a spray nozzle directed to the perforated conveyor connected to a coating liquid supply pipe is provided,
The second processing chamber includes a slit nozzle capable of forming an air curtain toward the perforated conveyor,
The loading and unloading ports of the workpiece of the first and second processing chambers, the work on the perforated conveyor is closed by passable curtains, further,
A coating liquid tank is provided opposite to the lower opening of the first and second processing chambers, and the coating liquid tank is connected to the coating liquid supply pipe so as to be circulated through a pump.
A continuous coating apparatus characterized by that. 6. The continuous coating apparatus according to claim 5 , wherein a jacket chamber is formed outside the first and second processing chambers, and the jacket chamber is connected to a mist collector. 7. The continuous coating apparatus according to claim 5 , wherein the continuous coating apparatus is an oily chemical solution coating apparatus.

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