JP2004330099A - Coated part production method and coated part production device - Google Patents

Abstract

Provided is a method and apparatus for producing a component to be coated, in which the uniformity of a coating after drying is extremely high.
A plurality of supports (7) for supporting a work (10) are fixed on a surface of a conveyor (2) along a conveying direction of the conveyor. Further, the portion of the conveyor 2 where the work transfer direction changes from the vertical transfer portion to the oblique transfer portion is directed vertically downward, and is located above the lubricant 11 of the storage tank 1. In this position, the work 10 is immersed in the lubricant 11 of the storage tank 1 with the contact portion 9 side of the support 7 turned downward. Further, the support 7 has a contact portion 9 in the form of a needle, which contacts the work 10 with an area as small as possible.
[Selection diagram] Fig. 1

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for producing a component to be coated, in which a liquid lubricant (including a water-based and a solvent-based) is applied to the surface of a component (steel including stainless steel) to be subjected to cold plastic working to form a coating, and production of the component to be coated. Equipment related.
[0002]
[Prior art]
Generally, when molding automobile parts and the like using cold forging or cold pressing, in order to maintain lubricity and mold releasability between a part (work) to be molded and a molding die, a pre-processing is performed. A water-based solid lubricant is applied to the surface of the work and dried to form a lubricant film on the work surface.
[0003]
Conventionally, as a method of applying the water-based fixed lubricant to the surface of the work, a belt conveyor that conveys the work to be applied while placing the work in a random state, and a coating liquid tank in which a liquid as a lubricant is stored. Is used. This is done by setting the conveyor line so that the belt conveyor passes through the lubricant in the coating liquid tank, and transporting the work placed on the belt conveyor while immersing the work in the lubricant to apply the lubricant to the work surface. It is a method of applying continuously.
[0004]
As another method, there is a technique of applying a lubricant to a work using a screw-type conveyor and drying the work (for example, see Patent Document 1). Patent Literature 1 discloses a tank for storing a lubricant, and a screw-type conveyor in which an input side end of a workpiece is immersed in the lubricant in the tank and is inclined and fixed to the tank. . In this technology, when applying lubricant, the work is put into the casing of the screw type conveyor from the work input port, immersed in the lubricant of the tank, and then the screw blades of the conveyor are rotated, so that the work is rotated. While being in contact with the screw surface of the screw blade and the inner surface of the casing, the screw blade is moved toward the work discharge port opposite to the work input port.
[0005]
As still another method, there is a technique of applying a lubricant to a work using a revolver-shaped rotating cylinder (for example, see Patent Document 2). Patent Literature 2 discloses a lubricant applying apparatus for applying an aqueous dry lubricant for cold forging to a rod-shaped work, in which a rotating drum having a substantially horizontal rotation center axis and a predetermined region of the rotating drum are provided. A lubrication tank that stores lubricant so that it is immersed in the rotary drum.The rotary drum stores the work in a lying state and penetrates the rotary drum linearly in the axial direction so that the work can enter and exit along the axial direction. There is disclosed a technique in which storage chambers are provided at both end surfaces thereof, and the lubricant is applied to a work in the storage chamber by allowing the storage chamber to pass through the lubricant in the lubrication tank by the rotation of the rotary drum.
[0006]
In addition, there is a technique of immersing a work in a lubricant in a lubrication tank by vertically reciprocating the work sent by a transport belt while holding the work in a vertical state (for example, see Patent Document 3). In addition, in the technology of applying a coating such as electrodeposition coating to the surface of a cylindrical magnet used for various motors for the purpose of smoothing, cleaning, rust prevention, etc., a coating process is performed. The cylindrical magnet) is attracted and fixed by a relatively weak magnet to prevent deformation of the object to be coated and to transport the object without adversely affecting the properties of the coating film and the magnetic properties of the object to be coated. There is also disclosed a coating technique which is easy to electrodeposit and suitable for mass production (for example, see Patent Document 4).
[0007]
[Patent Document 1]
JP-A-2002-234609 (paragraph number [0014], see FIG. 1)
[Patent Document 2]
JP-A-2002-102998 (paragraph number [0011], see FIGS. 1 and 2)
[Patent Document 3]
JP 2001-170733 A (see paragraph numbers [0024] and [0035], FIG. 1)
[Patent Document 4]
JP-A-8-176892 (paragraph numbers [0049], [0052], [0092], [0097]; see FIGS. 3 and 7)
[0008]
[Problems to be solved by the invention]
However, in the application method by the conveyance of the belt conveyor, since the works randomly placed on the conveyor are immersed and applied to the lubricant in a partially overlapping state, the application of the lubricant to the overlapping parts of the works is not possible. Become uniform. In addition, since the work is immersed in the lubricant while being in contact with the conveyor and is applied, the portion of the work that has been in contact with the conveyor is not uniformly applied. In addition, a large amount of lubricant is taken out by the conveyor, thereby increasing the processing cost.
[0009]
Further, the coating method according to Patent Document 1 is a method in which a work immersed in a lubricant is conveyed and dried while changing the direction of the work by a screw-type conveyor. Since the inner surface of the casing is frequently contacted, the lubricant coating film tends to be non-uniform. Furthermore, since the lubricant attached to the screw blade adheres to the work again each time it comes into contact with the work, the thickness unevenness of the coating film increases.
[0010]
Further, in the coating method according to Patent Document 2, the work is stored in a storage chamber of a rotary drum, and the rotation of the rotary drum causes the storage chamber to pass through a lubricant in a lubrication tank to apply the work. The workpiece contacts a wide area, and the application of the lubricant becomes uneven. In addition, since it comes into contact with a conveying device such as a conveyor before the drying process in a wet state before drying, the adhesion of the lubricant becomes uneven.
[0011]
Further, in the application method according to Patent Document 3, the work is held in a vertical state and reciprocated up and down so that the work is immersed in the lubricant in the lubrication tank and then dried. The lubricant is not applied, or a liquid pool is formed on the upper surface of the work, so that a uniform coating film is not formed.
[0012]
In any case, in the prior art, when applying a liquid lubricant while transporting the work, the work is often in contact with objects other than the lubricant or the contact area is wide, There was a problem that the uniformity of the coating after drying was very poor.
[0013]
In recent years, when making a pinion gear for an automobile part by cold forging, a highly lubricating cold forging agent is applied to the surface of a billet (cylindrical) before forging to form a coating film. Since such a pinion gear is formed by a very severe press, it is required that the coating on the billet surface is very uniform. However, the conventional coating technique cannot obtain a very uniform coating as described above, and thus is not suitable for producing high-precision parts for automobiles. Highly lubricating chemicals are often expensive and require a minimum required amount of coating treatment.
[0014]
In Patent Document 4, in the electrodeposition coating, the object to be coated is attracted by a magnet in a non-contact manner and pressed against a plurality of electrode needles to support and fix the object to be coated. Is merely performed by immersion in a processing solution and lifting. In other words, no attention has been paid to the removal (liquid drainage) of the liquid excessively attached to the object to be coated because it is a technique of electrodeposition coating. Further, the processing liquid adhering to the fixing jig for the object to be coated is taken out, leading to a loss of the processing liquid. Exceptionally, electrodeposition coating can be mostly recovered in the post-process, but other chemicals are very difficult to recover.
[0015]
Accordingly, an object of the present invention is to provide a method and a method for producing a coated part which can achieve extremely high uniformity of a dried film (coating) and a low processing cost in view of the above conventional problems. It is to provide a device.
[0016]
[Means for Solving the Problems]
The present inventors have conducted researches to solve the above-mentioned problems, and as a result, the uniformity of the coating applied to the surface is determined by the position of the applied component after dipping the applied component in the lubricant, The inventor has found that the component support structure when immersing the component has an influence, and has invented a method and an apparatus described below.
[0017]
That is, in order to achieve the above object, in the method for producing a component to be coated according to the present invention, the component to be coated is supported on a support by a magnetic force via a projecting portion provided on the support, and the component to be coated is liquid. After contacting the object, the part to be applied is not brought into contact with any part other than the protruding portion, and the posture of the part is changed, thereby removing excess liquid adhering from the part to be applied and drying.
[0018]
The apparatus for producing a component to be coated according to the present invention has a storage part for storing liquid and a protruding portion for supporting the component to be coated, and supports and fixes the component to be coated with the magnetic force so as to contact the component to be coated. After transferring the support and bringing the component to be contacted with the liquid in the storage section, changing the orientation of the component to be coated without bringing the component into contact with any part other than the protrusions. The present invention is characterized by comprising a transport unit for removing excess liquid adhering from the application part and a drying unit for drying the liquid adhering to the application target part.
[0019]
In the above-described production method and the production apparatus, the coated component is supported and fixed by magnetic force so that the coated component is brought into contact with the protruding portion of the support, so that the coated component is brought into contact with the support with a minimum contact area. It becomes possible to support, and the support has a very simple structure. Then, after the component to be coated thus supported is brought into contact with the liquid, the component to be coated is excessively adhered from the component to be coated by changing the posture of the component to be coated without contacting the component other than the protruding portion. Since the liquid has been removed, the coating on the surface of the part to be coated formed after drying becomes very uniform.
[0020]
In order to minimize the contact area between the component to be coated and the support, it is desirable that the component to be coated be supported by the support in a point contact with a protruding portion.
[0021]
Furthermore, in the process of transporting the support, after the protruding portion of the support is directed downward and the component to be coated is brought into contact with the liquid, the posture of the support is changed so that the protruded portion faces obliquely downward. It is desirable to remove excess liquid adhering from the parts to be coated. This is because when the part is separated from the liquid after the part is contacted with the liquid downward, the liquid stays in the upper part of the part that is in contact with the projecting part of the support. Therefore, the liquid remaining on the surface can be effectively removed by changing the posture of the support and the component to be applied such that the protruding portion faces obliquely downward. Further, when the part to be coated that has been brought into contact with the liquid is separated from the liquid, a slight stagnation of the liquid also occurs at the lower part of the part to be coated. .
[0022]
As a mode of changing the posture of the component to be coated, a mode in which the component to be coated is rotated while being moved is exemplified as in the following embodiments, but is not limited thereto.
[0023]
The term “contact” described in the claims and the detailed description of the invention means, for example, that the component to be applied is immersed in a liquid at room temperature or heated, or that the liquid is imparted with some reactivity. And immersing while partially reacting.
[0024]
In addition, `` liquid '' means, in addition to a water-based solid lubricant applied to maintain lubricity and mold release properties between a part before forging and a molding die, for example, paint paint, etc. It shall widely include coating agents.
[0025]
Further, “uniform” means that the thickness of the coating after applying and drying the liquid on the surface of the component to be coated is uniformly and uniformly attached to the component to be coated.
[0026]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. The apparatus shown here is one of the modes for realizing the method for producing a coated part of the present invention, and the present invention is not limited to this.
[0027]
FIG. 1 is a partial cross-sectional view showing an outline of an example of an apparatus for realizing a method for producing a coated part according to the present invention, and FIG. 2 is a partial cross-sectional view showing an outline of a work support in the present invention.
[0028]
The coated part production apparatus 14 of the embodiment shown in FIG. 1 is applied to a lubricant applying and drying step before press-working a workpiece 10 as a coated part in the present invention. The work 10 of this example uses a billet (cylindrical) that is cold forged by a press machine when forming an automobile part or the like, and is made of steel including stainless steel.
[0029]
The coated part production apparatus 14 includes a storage tank 1 for storing a liquid lubricant 11, a conveyor 2 for transporting only the work 10 so as to be immersed in the lubricant 11, and a control device 3 for controlling the conveyor 2 and the like. I have.
[0030]
The lubricant 11 is a water-based dry lubricant (also referred to as a water-based solid lubricant). For example, trade names “Fine Lube E760” and “Fine Lube E740C” manufactured by “Nippon Parkerizing Co., Ltd.” can be used.
[0031]
An electric heater 4 for heating the lubricant 11 in the tank to a predetermined temperature and a thermometer 5 for detecting and displaying the temperature of the lubricant 11 are provided in the storage tank 1 which is a storage area for the lubricant 11. The temperature of the lubricant 11 can be managed by the thermometer 5.
[0032]
The temperature of the lubricant 11 in the storage tank 1 can be set, for example, in the range of 50 ° C to 80 ° C. It should be noted that the heat generation amount of the electric heater 4 may be controlled based on the data detected by the thermometer 5. Further, instead of direct heating by a heater, indirect heating by a storage tank equipped with a water jacket is also possible.
[0033]
The belt-type conveyor 2 as a transport means in FIG. 1 has a configuration in which a horizontal transport portion, a vertical transport portion, and an oblique transport portion are continuous. That is, the conveyor 2 is looped around the three pulleys 6a, 6b, 6c, and the work transfer direction can be changed to the horizontal direction, the vertical direction, and the oblique direction at the positions of the pulleys 6a, 6b, 6c. . The conveyor 2 may be of various forms, for example, a chain type conveyor. Also. The inclination angle of the oblique conveyance portion of the conveyor 2 is set to an optimum value according to the shape of the work 10 or the characteristics (eg, viscosity) of the lubricant 11.
[0034]
A plurality of supports 7 that support the work 10 are fixed on the surface of the conveyor 2 along the conveying direction of the conveyor. The support 7 is made of a non-magnetic material such as plastic or some stainless steel.
[0035]
Further, the portion of the conveyor 2 where the work transfer direction changes from the vertical transfer portion to the oblique transfer portion is directed downward, and is located above the lubricant 11 of the storage tank 1. In this position, the work 10 is immersed in the lubricant 11 of the storage tank 1 with the contact portion 9 side of the support 7 turned downward.
[0036]
The support 7 has a contact portion 9 that contacts the work 10 with a minimum area. The contact portion 9 may have a projecting shape, and may have a needle shape, a rod shape, a spherical shape (hemispherical shape) or the like according to the shape of the work 10 (FIG. 2). Is also good. The number of the contact portions 9 is one or two or more. However, it is preferable to change the optimum shape for the contact portion 9 depending on the shape of the work 10 or the characteristics of the lubricant 11. By using such a contact portion 9, the contact area between the support 7 and the work 10 is reduced, or the space between the support 7 and the work 10 is increased.
[0037]
Further, a magnet 8 is attached inside the conveyor 2 looped around the three pulleys 6a, 6b, 6c. The magnet 8 extends along the conveyor 2 and maintains a predetermined distance between the magnet 8 and the conveyor 2. The magnet 8 may be a permanent magnet such as neodymium, or an electromagnet that is excited by electricity, or any other magnet that generates a magnetic force. By adjusting the magnetic force of the magnet 8 and the distance between the magnet 8 and the support 7, the work may be performed. 10 can be reliably fixed to the support 7. Note that, instead of the configuration in which the magnets 8 are provided inside the conveyor 2 as described above, a magnet may be inserted into the support 7. This configuration reduces the amount of magnets used in the device and is inexpensive.
[0038]
Above the horizontal transport portion of the conveyor 2, a mounting means 13 for mounting the work 10 on the support 7 on the conveyor 2, and detachment of the work 10 after the coating film dried on the support 7 is removed from the support 7 Means 12 are provided. The detaching means 12 and the attaching means 13 are not particularly limited in the configuration for realizing the means. For example, there is attaching and detaching of the work 10 to and from the support 7 by a robot arm. Unless the work 10 is strongly fixed, the detachment operation and the mounting operation may be facilitated from the time when the work is detached to the time when the next work is mounted. For example, as shown in FIG. In the existing transport area, the magnet 8 is moved further away from the support 7 or the magnetic force is reduced to adjust the fixing force of the work.
[0039]
Next, a flow of forming a lubricant film on the surface of the work 10 by the coated part production apparatus 14 of the present embodiment will be described.
[0040]
First, the cylindrical work 10 is lowered while being held by the mounting means 13, and is placed on the support 9 in the horizontal transfer portion of the conveyor 2. At this time, the cylindrical bottom surface of the work 10 is fixed to the contact portion 9 of the support 7 by the magnetic force of the magnet 7. In this state, the work 10 moves in the horizontal direction.
[0041]
After that, the transfer of the support 7 on which the work 10 is placed is shifted to the transfer in the vertical transfer portion by the pulley 6a, and the work 10 is stored in a state where the cylindrical axis direction is tilted 90 degrees with respect to the posture in the horizontal transfer portion. Move toward tank 1.
[0042]
When the support 7 comes near the position where the work transfer direction changes from the vertical transfer portion to the oblique transfer portion by the pulley 6b, the contact portion 9 side of the support 7 is turned downward, and the work 10 is removed from the lubricant 11 of the storage tank 1. Immersed in Further, at this immersion position, the posture of the work 10 is inverted by 180 degrees with respect to the posture in the horizontal transport portion. At this time, only the work 10 is immersed, and the contact portion 9 of the support 7 is immersed as little as possible. Further, the position of the conveyor 2 is set in this manner.
[0043]
Then, the work 10 immersed in the lubricant 11 is lifted out of the lubricant 11 while rotating about the pulley 6b, and at the same time, is transferred to the diagonal transfer part of the conveyor 2 and rises diagonally to the left in FIG. .
[0044]
The posture of the work in the oblique conveyance section is such that the cylindrical axis direction of the work 10 is oblique, and the upper and lower surfaces of the work 10 are inclined. For this reason, in the process of the oblique conveyance, the lubricant that has stayed at the portion that becomes the upper surface of the work 10 that is in contact with the contact portion 9 of the support 7 can be efficiently removed. That is, the shape of the contact portion 9 of the support 7 with the work 10 is designed to be minimized in accordance with the shape of the work to be supported, and the contact portion 9 reduces the space between the support 7 and the work 10. By increasing the size, there is almost no place where a liquid pool occurs on the surface of the work, so after the work is lifted from the liquid due to the change in posture due to the rotation of the work, the excess liquid on the top surface of the work is reliably removed, and The coating on the work surface can be made uniform. Further, even when the work 10 is separated from the lubricant, a small amount of the lubricant that stays at the lower part of the work 10 can be removed in the same manner as the upper part of the work due to the above-mentioned change in posture.
[0045]
Further, in the process after the immersion, the part of the work 10 other than the part which is in contact with the contact part 9 does not come into contact with the components of the apparatus at all, so that the lubricant can be uniformly applied to the surface of the work 10. Further, even in a portion of the workpiece 10 which is in contact with the contact portion 9, the contact portion 9 of the support 7 is formed into a needle-like shape, so that the area of the portion becomes very small. The coating on the work surface that has passed through becomes uniform or almost uniform.
[0046]
Thereafter, the coating film on the work surface is dried by a drying means (not shown) before the work 10 coated with the lubricant is detached from the support 7 on the conveyor 2 by the detaching means 12. As a method for drying, other than a method of sending hot air using a heater using electricity, kerosene, heavy oil, gas, induction heating, infrared rays, etc., a work is heated in advance and then dried by simply sending air. A method or a method of simply blowing air after raising the material temperature of the work by immersing the work in a heated liquid is possible.
[0047]
As described above, the excessively adhered liquid lubricant is removed from the work 10 and dried to form a lubricant film uniformly on the work surface. It is also possible. The removal of the surplus lubricant is not limited to a natural drop using gravity, a method using high pressure air of an air spray, a method for giving a weak vibration to the support 7, and the like.
[0048]
Further, the support 7 may have the contact portion 9 to be brought into contact with the work 10 as described above, and may have any shape, for example, a rod shape, a tubular shape, a plate shape, or the like. In addition to metals such as lead, steel, titanium, titanium alloy, copper, copper alloy, aluminum, and aluminum alloy, nonmetals such as resin, plastic, pottery, glass, and enamel may be used.
[0049]
The conveyor 2 as a conveying means is provided with a support 7 of a workpiece 10 to be coated and moves along with the conveyance. However, the conveyor 2 is not limited to the embodiment shown in FIG. Orbits of the conveyor 2 and the support 7 can be arbitrarily changed by changing the position and the number of. For example, when the conveyor is rotated by two pulleys, the conveyor is constituted by a semicircle and an oblique trajectory. In FIG. 1, the conveyor belt is wrapped around the pulleys 6b and 6c.
[0050]
In addition to the conveyor form, for example, the belt-shaped conveyor is replaced with a cylindrical rotary drum, and the support 7 is provided around the circumference of the rotary drum, and the contact portion 9 is provided on the opposite side of the center of the rotary drum. Alternatively, the work 10 may be fixed so as to face, and the posture of the work 10 supported by the support 7 may be changed by rotation of the rotating drum (see FIG. 3). That is, the transporting means applied to the present invention is such that the support is fixed to the transporting part that draws a polygonal line or a curved trajectory, the workpiece is supported by the support with a minimum contact area, and the workpiece is supported along the transporting part. Any form can be applied as long as the position of the workpiece is changed by moving the workpiece without contacting any part other than the contact part.
[0051]
In addition, as a method of contacting the work with the liquid lubricant, the form in which the work is immersed in the liquid is employed. However, the present invention is not limited to this. Alternatively, the liquid may be immersed while being stirred, or the liquid may be blown up from below like a fountain, or sprayed with a nozzle or the like.
[0052]
【The invention's effect】
According to the present invention, in a liquid application technique of applying a liquid to a component to be coated, the component to be coated is supported and fixed by magnetic force so that the component to be coated is brought into contact with a protruding portion of a support. Can be supported on the support with a minimum contact area. In addition, since the support has a very simple structure, the apparatus can be manufactured at low cost. Further, the cost of the coating process can be suppressed at a low cost.
[0053]
Then, after the component to be coated thus supported is brought into contact with the liquid, the component to be coated is excessively adhered from the component to be coated by changing the posture of the component to be coated without contacting the component other than the protruding portion. Since the liquid is removed, the coating on the surface of the component to be applied formed after drying can be formed very uniformly.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional view showing an outline of an example of an apparatus for realizing a method for producing a coated part according to the present invention.
FIG. 2 is a partial cross-sectional view showing an outline of a work support in the present invention.
FIG. 3 is a diagram showing another embodiment of an apparatus for realizing the method for producing a coated part according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Storage tank 2 Conveyor 3 Control device 4 Electric heater 5 Thermometer 6a, 6b, 6c Pulley 7 Support body 8 Magnet 9 Contact part 10 Work 11 Lubricant 12 Desorption means 13 Mounting means 14 Apparatus for producing parts to be coated

Claims (8)

The part to be coated is supported on the support by magnetic force via a protruding portion provided on the support, and after the part to be coated is brought into contact with a liquid, the part to be coated is other than the protruding part. A method for producing a component to be coated, wherein an excessively attached liquid is removed from the component to be coated by changing the posture of the component to be coated without contacting the liquid, and the liquid is dried. The method for producing a component to be coated according to claim 1, wherein the component to be coated is supported on the support in a point contact with the projecting portion. In the process of transporting the support, after contacting the component to be applied with the protruding part of the support facing downward and the liquid, the posture of the support is adjusted so that the protruding part faces obliquely downward. The method for producing a component to be coated according to claim 1, wherein the liquid that is excessively attached is removed from the component to be coated by changing the component. 4. The method for producing a component to be coated according to claim 1, wherein the liquid is a lubricant that is formed on a surface of the component to be coated during forging. 5. A storage unit for storing a liquid,
A support body having a projecting portion for supporting the component to be coated, magnetically supporting and fixing the component to be applied to the projecting portion,
Conveying the support, and after the component to be applied is brought into contact with the liquid in the storage section, by changing the posture of the component to be applied without contacting the component to be applied other than the protruding portion. Conveyance means for removing excess adhered liquid from the part to be coated,
A part to be coated, comprising: a drying unit configured to dry the liquid adhered to the part to be coated. The apparatus for producing a component to be coated according to claim 5, wherein the component to be coated is supported on the support in a point contact with the projecting portion. In the process of transporting the support, the transporting unit contacts the component to be applied with the protruding part of the support facing downward and the liquid in the storage unit, and then the protruding part is inclined downward. The device for producing parts to be coated according to claim 5, wherein an excessively attached liquid is removed from the part to be coated by changing a posture of the support so as to face. The coating target component production apparatus according to claim 5, wherein the liquid in the storage section is a lubricant formed on a surface of the coating target component when forging the coating target component.

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