KR101702615B1

KR101702615B1 - Method for Treating the Surface of Disk Brake Caliper

Info

Publication number: KR101702615B1
Application number: KR1020150054212A
Authority: KR
Inventors: 전형준
Original assignee: 주식회사 에스이케이
Priority date: 2015-04-17
Filing date: 2015-04-17
Publication date: 2017-02-03
Also published as: KR20160123712A

Abstract

The present invention relates to a method of treating a surface of a caliper mounted on a disc brake of an automobile. More particularly, the present invention relates to a caliper of a caliper made of an aluminum alloy to apply various colors to the surface of the caliper, To a surface treatment method of a disc brake caliper for machining and treating a surface of a caliper so as to maintain hardness.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc brake caliper,

Generally, aluminum is widely used in automobile parts such as wiper head and piston, building materials such as chassis and windows, communication equipment such as mobile phone cases, and sports goods such as arrowheads. Since aluminum is an active metal, an oxide film is easily formed in a natural state. However, since an oxide film formed in a natural state is not uniform and thin, it is necessary to form an oxide film artificially. Thus, conventionally, the surface of an aluminum product is pretreated to remove the oil adhering to the surface, and then an anodizing process is performed to form an oxide film on the surface of the aluminum product.

An anodizing treatment method for causing the color of aluminum to naturally develop in a single color of milky white, gray or black is known in domestic patents including Japanese patent. The electrolysis conditions in the anodizing treatment are generally anodized at a temperature of 15 to 25 DEG C, a voltage of 15 to 20 volts or higher and a temperature of 25 to 50 minutes in a lactic acid solution of 12 to 25% The color can be obtained with the required anodizing film such as black.

The anodizing treatment method used in this case can be classified into hard anodizing and soft anodizing. Hard anodizing has an advantage of excellent corrosion resistance and abrasion resistance because of its high surface hardness. However, it is difficult to apply various colors to the surface of aluminum, It is impossible to satisfy all the requirements of the customer. On the other hand, aluminum produced by the soft anodizing method has a surface hardness lower than that of the aluminum produced by the hard anodizing method, and thus the wear resistance is insufficient. However, due to the advantage that various colors can be displayed on the surface of aluminum, Various colors could be derived according to the requirements of the present invention.

The development of an automotive disc brake surface treatment method capable of exhibiting various colors on the surface of aluminum and having a constant surface hardness by receiving the merits of the hard anodizing surface treatment method and the soft anodizing surface treatment method as described above It is necessary.

1. Published Patent Application No. 10-2010-0085704 'Surface treatment method of high strength aluminum material' (Published on July 29, 2010) 2. Registered Patent Publication No. 10-1448445 'Method for surface treatment of aluminum frame' (Registered on Apr. 2014) 3. Published Japanese Patent Application No. 10-2014-0114573 " Method for manufacturing color wheel using anodizing " (Published date 2014.09.29)

The present invention has been devised to solve the problems described above, and it is an object of the present invention to oxidize the surface of a disk brake caliper made of aluminum, to color various colors according to the requirements of a user, Which can improve the wear resistance and corrosion resistance of the disc brake caliper, which can compensate for corrosion and pollution.

A method of surface treatment of a disk brake caliper according to the present invention includes: a caliper body forming step (S100) of machining an outer shape of a caliper made of aluminum mounted on a disk provided in a drive device of a vehicle and controlling movement of the vehicle; A first preprocessing step (S210) of removing foreign matters adhering to the surface of the caliper formed; A second preprocessing step (S220) of removing the oil adhered to the surface of the caliper after the first preprocessing step (S200); A first water washing step (S310) of washing the surface of the caliper after performing the second pre-treatment step (S220); A first surface treatment step of immersing the caliper in an alkali-based solution having a concentration of 5 to 15% by weight to remove an oxide film formed on the surface of the caliper after the first water-washing step (S300) to obtain a uniform surface (S400); A first neutralization step (S510) of neutralizing the alkali-based solution remaining on the surface of the caliper after the first surface treatment step (S400); A second surface treatment step (S600) of immersing the caliper in the electrolytic solution so that a fine porous oxide film is formed on the surface of the caliper and oxidizing the surface of the caliper to a constant thickness by supplying a constant voltage; A second water washing step (S320) of washing the surface of the caliper after the second surface treatment step (S600); A dyeing step (S700) of infiltrating an arbitrary color onto the surface of the porous oxide film; And a third surface treatment step (S800) of closing the micropores of the porous oxide film so that the corrosion resistance of the caliper surface increases after the dyeing step (S700) is performed and the penetrated color is colored on the surface .

In the present invention, the electrolytic solution of the second surface treatment step (S600) has a temperature of 0 to 20 DEG C in which sulfuric acid is dissolved in an amount of 10 to 25 wt%, a voltage supplied to the electrolytic solution is 0 to 90 V, To 300 A / m < 2 >, and the operation time is continued so that the oxide film has a thickness of 30 to 40 mu m.

In the dyeing step (S700), the caliper is immersed in an electrolytic solution having a temperature of 10 to 20 占 폚 in which sulfuric acid is dissolved in a proportion of 20% by weight, And a voltage is supplied.

In the present invention, a polishing step (S900) is performed between the first neutralization step (S510) and the second surface treatment step (S600) to increase the smoothness of the surface of the caliper to obtain gloss, (S900) is characterized in that the caliper is immersed for 1 to 120 seconds in a solution having a temperature of 80 to 100 DEG C mixed with 95 weight% of phosphoric acid and 5 weight% of nitric acid.

In the present invention, a coating finishing step (S1000) for finishing the surface of the caliper by electrodeposition coating is further performed after the third surface finishing step (S800).

The present invention relates to an aluminum disk brake caliper which is formed of aluminum and which is made of an aluminum alloy, which prevents corrosion of the surface of the automobile disk brake caliper and adjusts the voltage, temperature and electrolysis time using anodizing, The surface of the substrate can have a constant hardness and at the same time, various colors can be easily colored.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flowchart showing a step sequence of a surface treatment method of a disc brake caliper according to the present invention; FIG.
2 is a flow chart illustrating the addition of a polishing step to the surface treatment method of the disc brake caliper of the present invention.
3 is a flow chart showing the addition of the coating step of the surface treatment method of the disc brake caliper of the present invention.

A method of surface treatment of a disc brake caliper according to the present invention relates to a method of treating a surface of a caliper capable of controlling movement of a vehicle mounted on a disc provided in a driving apparatus of a vehicle. This is a technique that not only displays various colors on the caliper surface but also prevents surface corrosion and improves surface strength. Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a flowchart showing a step sequence of a surface treatment method of a disc brake caliper according to the present invention. FIG. 2 is a flowchart showing a polishing step added to a surface treatment method of a disc brake caliper according to the present invention. And a coating step of a surface treatment method of a brake caliper is added.

Referring to FIG. 1, the body of the caliper is first molded (S100). Preferably, the caliper is made of an aluminum alloy, and the aluminum used is a heat-treated alloy and is preferably made of an alloy of aluminum, magnesium and silicon (6000 series).

Then, a first preprocessing step (S210) is performed in which the outer shape of the caliper is cut and machined into a shape desired by the user, and then the foreign substances attached to the surface of the caliper are removed. The first preprocessing step (S210) corresponds to polishing the surface of the caliper using a separate mechanical mechanism. That is, various defects are likely to occur on the surface of the caliper when forming aluminum, and it has a purpose to remove such defects, scratches, and the like. Grinding, wire brush, or the like may be used as the method used in the first preprocessing step (S210), and a method of sandblasting and barrel finishing may be used. The surface can be polished.

Referring to FIG. 1, a second preprocessing step (S220) is performed to remove oil and fat adhering to the surface of the caliper after the first preprocessing step (S210). The second preprocessing step (S220) has a purpose of chemically or electrically treating the surface of the caliper to remove grease remaining on the surface during the molding process. The second pretreatment step (S220) may be performed by alkali degreasing, acid degreasing, solvent degreasing, etc., preferably by an alkali degreasing method.

Referring to FIG. 1, a first water washing step S310 of washing the surface of the caliper after the second pre-treatment step S220 is performed. The first water washing step S310 corresponds to a step of washing the caliper with the washing water to remove the alkaline solution remaining on the surface of the caliper.

Referring to FIG. 1, a first surface treatment step (S400) for removing an oxide film formed on a surface of a caliper after a first water washing step (S310) is performed. That is, an oxide film is irregularly formed on the surface of the caliper while performing the first and second preprocessing steps (S210, S220) and the first washing step (S310). In order to remove the oxide film and obtain a uniform caliper surface, Step S400 is performed. More specifically, the caliper is immersed so that the entire surface of the caliper is brought into contact with an alkali-based solution having a concentration of about 5 to 15% by weight. At this time, it is preferable that the temperature of the solution of the alkali-based solution is heated to about 50 to 90 ° C., and it takes preferably about 1 to 90 seconds for the immersion. It is noted that the deposition time can be easily changed according to the thickness of the oxide film formed on the surface of the caliper.

Referring to FIG. 1, a first neutralization step (S510) of neutralizing the alkali-based solution remaining on the surface of the caliper after the first surface treatment step (S400) is performed. The surface of the caliper can be kept neutral through the first neutralization step (S510).

Referring to FIG. 1, a second surface treatment step (S600) for oxidizing the surface of the caliper to a constant thickness is performed after the first neutralization step (S510). The second surface treatment step (S600) is performed by depositing a caliper in the electrolyte solution and supplying a constant voltage to form a fine porous oxide film on the surface of the caliper.

In other words, calipers are made of aluminum alloy, so when the surface is bonded with oxygen, it is naturally oxidized to form a thin film. The resulting coating has various surface properties that are different from other metals. Therefore, when the caliper is polarized in the electrolytic solution as an anode, an oxide film thicker than the natural oxide film and having improved physical properties can be formed. In this case, the resulting coating film can be divided into two types: a barrier type (baryta type) and a porous type (porous type) film in which fine pores are formed. In the caliper of the present invention, it is preferable to form an oxide film in which fine pores are formed.

At this time, the electrolyte in the second surface treatment step (S600) may be used by dissolving sulfuric acid in an amount of 10 to 25% by weight, and the electrolytic solution in which the sulfuric acid is dissolved is heated to a temperature of about 0 to 20 ° C. The voltage supplied to polarize the caliper immersed in the electrolytic solution is set to about 0 to 90 V, the current density is set to 100 to 300 A / m 2, and the time for performing the formation of the oxide film to have a thickness of 30 to 40 μm is controlled do.

That is, when the thickness of the oxide film is 40-50 μm, the hardness of the Vickers hardness (HV) is about 350-450 HV, the surface hardness is high, but the number of colors that can be expressed is quite limited. On the other hand, Of the surface hardness and thus it is vulnerable to external scratches.

Therefore, when the thickness of the oxide film formed on the surface of the caliper is 40-50 탆 as in the above description, good hardness can be obtained and various colors can be dyed on the surface of the caliper.

Referring to FIG. 1, a second water washing step S320 for washing the surface of the caliper after the second surface treatment step (S600) is performed. The second water washing step (S320) has the same purpose and effect as the first water washing step (S310), and is similar to the description of the first washing step (S310).

Referring to FIG. 1, a dyeing step (S700) for dyeing the surface of the oxide film having a plurality of fine pores is performed after a second water washing step (S320). The dyeing step (S700) corresponds to a step of allowing the user to dye any desired dye into fine pores formed on the oxide film to produce a color on the surface of the caliper. The dyeing step (S700) may use a dye of an inorganic compound or a dye of an organic compound. In the dyeing step (S700) used in the caliper of the present invention, an inorganic dyeing method using a dye of an inorganic compound is performed.

In the dyeing step (S700) performed at this time, the sulfuric acid is dissolved in a proportion of 20% by weight, and the caliper is immersed in the electrolyte at 10 to 20 ° C. Then, a voltage of 10 to 20 V is supplied to the electrolytic solution to adsorb the dye on the oxide film. The dye then diffuses and penetrates into the micropores formed in the oxide film and accumulates.

Referring to FIG. 1, after performing the dyeing step (S700), the micropores of the porous oxide film formed on the surface of the caliper are blocked to prevent leakage of the dye accumulated in the micropores, and the third surface treatment for increasing the corrosion resistance of the caliper surface Step S800 is performed. The third surface treatment step (S800) may be performed in such a way that when the boiling water or pressurized water vapor is brought into contact with the surface of the caliper, the oxide film is hydrated and the micropores are blocked. After the caliper is immersed in the metal salt aqueous solution, It can be carried out by penetrating the micropores and simultaneously hydrolyzing and blocking the micropores. In this case, the metal salt may be used as nickel acetate or cobalt acetate. Or a method of coating micropores by applying an organic matter such as oil or synthetic resin to the surface of the caliper and coating the surface of the caliper to coat the micropores.

Referring to FIG. 2, a polishing step (S900) may be performed between the first neutralization step (S510) and the second surface treatment step (S600). This is performed to increase the smoothness of the caliper surface to obtain gloss and to obtain a uniform thickness of the oxide film during the second surface treatment step (S600). The polishing step (S900) is carried out by immersing the caliper for about 1 to 120 seconds in a solution having a temperature of 80 to 100 DEG C mixed with 95 weight% of phosphoric acid and 5 weight% of nitric acid.

Referring to FIG. 3, after the third surface treatment step (S800), a coating finishing step (S1000) for finishing the surface of the caliper with an electrodeposited coating is further performed. The coating finishing step (S1000) can deposit the caliper on the paint and then apply a constant voltage to the paint to form a coating film on the surface of the caliper. As a result, the surface of the caliper can be coated with a uniform thickness so that the rustproofing can be improved and the advantage of providing a gloss effect can be obtained.

Since the surface of the caliper mounted on the automotive disc brake of the present invention in which the above steps are performed can obtain surface strength improved, it is possible to prevent breakage and scratches caused by external impacts, tools and the like during vehicle maintenance, It can be colored on the surface so that it is possible to widen the range of color selection according to the demand of the user.

none.

Claims

A caliper body forming step (S100) for machining an outer shape of a caliper made of aluminum mounted on a disk provided in a driving device of the vehicle and controlling movement of the vehicle;
A first preprocessing step (S210) of removing foreign matters adhering to the surface of the caliper formed;
A second preprocessing step (S220) of removing the oil adhered to the surface of the caliper after the first preprocessing step (S200);
A first water washing step (S310) of washing the surface of the caliper after performing the second pre-treatment step (S220);
A first surface treatment step of immersing the caliper in an alkali-based solution having a concentration of 5 to 15% by weight to remove an oxide film formed on the surface of the caliper after the first water-washing step (S300) to obtain a uniform surface (S400);
A first neutralization step (S510) of neutralizing the alkali-based solution remaining on the surface of the caliper after the first surface treatment step (S400);
A second surface treatment step (S600) of immersing the caliper in the electrolytic solution so that a fine porous oxide film is formed on the surface of the caliper and oxidizing the surface of the caliper to a constant thickness by supplying a constant voltage;
A second water washing step (S320) of washing the surface of the caliper after the second surface treatment step (S600);
A dyeing step (S700) of infiltrating an arbitrary color onto the surface of the porous oxide film;
And a third surface treatment step (S800) of closing the micropores of the porous oxide film so as to increase the corrosion resistance of the caliper surface after the dyeing step (S700) and color the infiltrated color on the surface,
The electrolytic solution of the second surface treatment step (S600) is prepared by dissolving sulfuric acid in an amount of 10 to 25% by weight to form an oxide film having a porous porous form having fine pores on the surface of the caliper, The voltage supplied to the electrolyte is 0 to 90 V and the current density is 100 to 300 A /
The caliper is polarized so that the thickness of the oxide film is formed to be 30 to 40 占 퐉 with the caliper as an anode in the electrolyte so as to improve physical properties of the porous oxide film,
The third surface treatment step (S800) may include immersing the caliper in an aqueous metal salt solution containing nickel sate or cobalt suture so that hydrolysis occurs to penetrate the porous oxide film with nickel sulphate or cobalt sulphate to block the micropores Wherein the surface of the disc brake caliper is surface treated.

delete

The method according to claim 1,
The dyeing step (S700) uses an organic or inorganic dye, and the caliper is immersed in an electrolytic solution having a temperature of 10 to 20 DEG C in which sulfuric acid is dissolved in a proportion of 20 wt%, and then a voltage of 10 to 20 V is supplied Wherein the surface of the disc brake caliper is surface treated.

The method according to claim 1,
(S900) between the first neutralization step (S510) and the second surface treatment step (S600) to increase the smoothness of the surface of the caliper to obtain gloss,
Wherein the polishing step (S900) comprises immersing the caliper in a solution having a temperature of 80 to 100 DEG C mixed with 95 weight% of phosphoric acid and 5 weight% of nitric acid for 1 to 120 seconds .

The method according to claim 1,
Wherein a coating finishing step (S1000) of finishing the surface of the caliper with an electrodeposited coating is performed after performing the third surface finishing step (S800).