JPH11207620A - Article surface treatment method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To continuously and efficiently perform surface finishing, prevent solid substance from remaining in fine clearance and hole and prevent a possibility of damaging a surface by processing the surface of an article by cleaning liquid that water soluble compound is added to water soluble compound saturated aqueous solution. SOLUTION: Cleaning liquid 4 is adjusted by further adding and diffusing water soluble compound in water soluble compound saturated aqueous solution that water soluble compound is dissolved in water till water soluble compound is saturated at a using temperature. Even if an article is a complicated shaped one, a surface processing can be efficiently performed only if cleaning liquid 4 is blown. Even if cleaning liquid 4 remains in fine clearance and hole and is dried and water soluble compound remains, water soluble compound can be easily removed by water because the compound is water soluble. For instance, a workpiece 1 having a groove working surface of 1 mm in width is fixed to a rotatable mounting base 2, cleaning liquid 4 is injected together with compressed air from a nozzle 3, a cleaning burring is performed, a washing is performed by injecting water from a washing nozzle 7, and sticking and remaining cleaning liquid 4 is removed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating a surface of an article, and more particularly, to a method for treating a surface of various metal products manufactured by metal working and various resin products manufactured by molding. The present invention relates to a surface treatment method for removing burrs generated at the time of molding with a mold or cutting of metal or burrs remaining on a resin molded product.

[0002]

2. Description of the Related Art Burrs generated when a hot steel plate or the like is molded by a metal mold or metal cutting processing or burrs remaining on a resin molded product are conventionally performed manually or automatically using tools, blades, brushes, and the like. It has been removed by an apparatus (robot) or by a method using electricity or gas such as electropolishing or deburring. However, while cutting and molding are performed by an automatic machine, in the above-described conventional deburring method, deburring has to be performed for each piece, and productivity has been extremely low. In addition, in the case of electrolytic polishing and deburring, there is a disadvantage that the maintenance of the apparatus is expensive.

Therefore, it is conceivable to continuously perform deburring by spraying solid particles, for example, glass beads onto articles with burrs by blast shot or liquid honing. , Is very difficult to take out. There is also a problem that a solid substance such as glass beads damages the surface of a metal or resin product.

[0004]

SUMMARY OF THE INVENTION According to the present invention, surface treatment of a metal or resin article, for example, deburring and cleaning can be continuously and efficiently performed, and no solid substance remains in minute gaps and holes of the article. It is another object of the present invention to provide a method that does not damage the surface of an article.

[0005]

According to the present invention, an object of the present invention is to provide a method for treating a surface of an article, which comprises treating a surface of the article with a cleaning solution obtained by adding the water-soluble compound to a saturated aqueous solution of the water-soluble compound. Is solved by

The water-soluble compound used in the present invention is:
A compound that is soluble in water and that is excessively added to a saturated aqueous solution and is insoluble and dispersed has a hardness suitable for surface treatment, particularly deburring. The hardness of the compound is selected depending on the hardness of the article to be treated. For a hard metal, a compound having a relatively high hardness may be used, but it is not preferable to use a hard compound for a soft metal or resin because the surface is damaged.

The following compounds can be exemplified as water-soluble compounds that can be used in the present invention, but are not limited thereto. Carbonate: sodium carbonate, sodium hydrogencarbonate, potassium hydrogencarbonate, potassium sodium carbonate Sulfate: sodium sulfate, neutral aluminum monosulfate Phosphate: primary, secondary and tertiary sodium phosphate, acidic sodium pyrophosphate, acidic meta Sodium phosphate, sodium tripolyphosphate, sodium hexametaphosphate, calcium dihydrogen phosphate Silicate: Sodium silicate Hypochlorite: Sodium hypochlorite Aluminate: Sodium aluminate Phthalate: Potassium hydrogen phthalate Other industrial salts , Salt and the like can also be used. Among these, carbonates, particularly sodium hydrogencarbonate or potassium hydrogencarbonate, and sodium sulfate are preferable in terms of dissolution rate, metal corrosiveness (rust generation), safety, and the like.

The washing solution can be prepared by dissolving a water-soluble compound in water until it is saturated at a use temperature, further adding a water-soluble compound to a saturated solution, and dispersing the compound in the solution. The amount of saturation depends on the water-soluble compound and the temperature used. The amount of the water-soluble compound to be added in excess may be appropriately adjusted depending on the purpose of the treatment.The amount is increased for deburring, and the amount is reduced for cleaning foreign substances attached to the surface, for example, grease, and so on. Adjust.

The surface treatment method of the present invention can be applied to any articles. For example, metals (iron, steel, stainless steel,
Aluminum, copper, etc.) and plastics. The shape of the article is not particularly limited. Even an article having a complicated shape can be efficiently surface-treated because only the cleaning liquid is sprayed. Further, even if the cleaning liquid remains in the fine gaps and holes and the compound remains after drying, the compound is water-soluble and can be easily removed with water.

The cleaning liquid used in the present invention contains, in addition to the water-soluble compound, a cleaning agent for enhancing the cleaning effect, for example, a surfactant or an additive such as a rust preventive for preventing rust generation. Can also be added. Usually, the concentration of these additives is 1 to 10% by weight, preferably 3 to 10% by weight, based on the washing liquid.
7% by weight.

The cleaning liquid can be applied to the article by conventional methods and apparatus for treating the article with the liquid. For example, deburring and surface cleaning can be performed by injecting a cleaning liquid onto the article with an appropriate pressure using an injector. Depending on the material, the surface roughness can also be improved.

Hereinafter, the present invention will be described specifically with reference to examples.

EXAMPLE 1 Example 1 As shown in FIG. 1, a workpiece 1 (iron (SCM21) built-in hydraulic solenoid valve spool) having a surface with a groove of 1 mm width was mounted on a rotatable mounting table 2. Fixed. On the other hand, the cleaning liquid 4 (the same volume of sodium carbonate is dissolved and dispersed in water) is pumped to the nozzle 3 with compressed air (5 kg / cm ² ), so that the nozzle 3 applies the cleaning liquid to the cleaning surface (the surface having grooves) of the workpiece 1. Injected for 10 seconds. The distance between the cleaning surface and the tip of the nozzle was 10 to 15 mm. The recovered cleaning liquid after the injection passed through the mesh saw 5 and the water passage towel 8 and was returned to the cleaning liquid tank. After removing the cleaning burrs, the workpiece 1 was rotated so that the cleaning surface was directed to the washing nozzle 7 side, and water was sprayed from the nozzle 7 to perform washing, thereby removing the remaining aqueous solution. The washing water passes through the water flow tow 8,
Collected in tank 5. In this case, the water flown is moved to the left in FIG. 1 by the cylinder 9, and the washing water flows down to the tank 5.

FIG. 2 shows the surface of the workpiece before deburring. In the photograph of FIG. 2, two black lines are grooves,
Numerous burrs are found at both edges of the groove. The surface roughness (Ra) of the flat surface was 1.5 μm. FIG. 3 shows the surface of the workpiece after the cleaning deburring. All burrs were removed from both edges of the groove. The surface roughness of the flat surface is 0.5
μm.

Example 2 Cleaning deburring was performed in the same manner as in Example 1 except that a valve body made of aluminum was used as a work piece. FIG. 4 shows the edge portion of the workpiece before cleaning deburring. Many burrs are found at the edge. FIG. 5 shows the edge portion of the workpiece after cleaning deburring. All burrs were removed from the edge portion.

[Brief description of the drawings]

FIG. 1 is a schematic view of a cleaning apparatus used in an embodiment.

FIG. 2 is a photomicrograph showing the surface state of the workpiece cleaned in Example 1 before cleaning.

FIG. 3 is a photomicrograph showing the surface state of the workpiece cleaned in Example 1 after cleaning.

FIG. 4 is a photomicrograph showing the surface state of the work piece cleaned in Example 2 before cleaning.

FIG. 5 is a photomicrograph showing the surface state of the work piece cleaned in Example 2 after cleaning.

[Explanation of symbols]

1: Workpiece, 2: Rollable mount, 3: Nozzle,
4: cleaning solution, 5: snowboard, 7: nozzle, 8: toyu, 9:
cylinder.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Koichi Ito 2-6-1 Nishi-Nagasu-cho, Amagasaki-shi, Hyogo Inside Nard Research Institute, Inc. (72) Inventor Yoei Mizukami 2 Nishi-Nagasu-cho, Amagasaki-shi, Hyogo No.6-1, Nard Research Institute Co., Ltd.

Claims (7)

[Claims] 1. A method for treating the surface of an article, comprising treating the surface of the article with a cleaning solution obtained by adding the water-soluble compound to a saturated aqueous solution of the water-soluble compound. 2. The surface treatment method according to claim 1, wherein the surface treatment is deburring. 3. The surface treatment method according to claim 1, wherein the water-soluble compound is a water-soluble carbonate. 4. The surface treatment method according to claim 3, wherein the water-soluble carbonate is sodium hydrogen carbonate or potassium hydrogen carbonate. 5. The surface treatment method according to claim 1, wherein the water-soluble compound is sodium sulfate. 6. The surface treatment method according to claim 1, wherein the cleaning liquid further contains a cleaning agent and / or a rust inhibitor. 7. The method according to claim 1, wherein the cleaning liquid is sprayed on the surface of the article.
7. The surface treatment method according to any one of 6.