JP2005224902A - Substrate processing method of base material surface, base material having substrate processed surface by this method and product - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a substrate processing method of a base material surface capable of forming high adhesive force between painting or various coatings and a base material, preventing growth of a crack and providing a favorable membrane at low processing cost, the base material having a substrate processed surface by this method and a product. <P>SOLUTION: The surface including primary and secondary surfaces 1 and a secondary blast surface 2 is made by applying primary blast treatment on the base material surface on which the painting or the coating is applied, thereafter, cutting it off by a polishing method so that a part of a dimple of blasting remains and treating it by a blasting material finer than a blasting material used for the primary blast treatment as the secondary blast treatment. It is possible to make the primary blast treatment shot peening of more than full coverage. Especially it is suitable as the substrate processing for diamond like carbon film coating. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a base material surface treatment method when a material different from a coating material or a base material is coated or coated on the surface of the base material by an arbitrary method such as an ion plating method, a sputtering method, or an ion deposition method, and the method The present invention relates to a base material and a product having a surface that has been surface-treated.

  When a material different from paint or base material is coated or coated on the surface of a metal base material by ion plating, sputtering, ion vapor deposition, or other methods, the base material side is subjected to ground treatment. The Conventionally, rusting, deposits, oxide scales, and the like on the surface of the base material are generally removed by blasting, and the surface of the base material is roughened to suit the painting or coating, and the fabric is adjusted. In this blasting process, in addition to the surface cleanliness generally defined by ISO 8504-1 and JSI Z0310, the degree of processing is often indicated by surface roughness. The actual situation is set each time.

  However, for the surface of the base material to be coated or coated, the desired adhesion between the base material and the coating and the life of the coating film cannot be obtained simply by indicating the size of the roughness or the range of the roughness. Conventionally, in order to increase the adhesion, those having a sharp angle as the shape of the projection material are used, but generally, the larger the surface roughness, the more paint or coating material is required, and the processing cost is high. There was a problem. In addition, if the coating amount of the coating material or coating material is small, the coating film or coating material on the rough surface portion on the base material side is extremely thin and cannot cover the rough portion, which shortens the life of the coating film. There was a problem.

  Therefore, conventionally, not a simple blasting process but a blasting process is performed a plurality of times by changing the type of the projection material. For example, Patent Document 1 discloses a low specific gravity after performing a primary blasting process using a hard projection material as a base material base treatment method for spraying a wear-resistant material onto a base material surface made of an aluminum alloy. The secondary treatment with a projection material having a fine particle diameter is described. However, as shown in FIG. 4 (b), the ground-treated surface by this method also has an acute-angled tip portion, so that when the coating film is thin, such as a diamond-like carbon film, the acute angle is not necessary. There is a risk that the tip of the shape will cause cracks in the coating film.

The diamond-like carbon film (DLC film) is a carbon film excellent in lubricity and hardness as disclosed in Patent Document 2, and enables dry plastic processing without using a lubricant by forming it on the tool surface. It is attracting attention as a technology. However, the diamond-like carbon film has a problem with the adhesion to the metal base material, and non-patent literature describes that the adhesion is improved by the ground treatment by blasting, but the adhesion is improved and cracks are prevented. A ground treatment method that can satisfy both of these requirements has not yet been established.
Japanese Patent No. 3430427 JP 2000-96233 A “Material Testing Technology” Vol.4, No.2, pp.11-15, “Adhesion Evaluation Method for DLC Films for Molds” April 2003

  The present invention solves the above-mentioned conventional problems, activates the surface of the base material to be coated or coated, forms a high adhesion between the coated or various coating and the base material, and generates cracks. The present invention has been made for the purpose of providing a base material surface preparation method capable of preventing and providing a good film at a low processing cost, and a base material and product having a surface treated by this method. .

  The invention of claim 1, which has been made to solve the above-mentioned problems, is a base material surface treatment method for coating or coating, wherein the base material surface has a primary blast treatment of 0.3 to 2.5 mm. After projecting a spherical projecting material or polygonal projecting material, it was scraped off by a polishing method so that a part of the depth of the dent of the blast remained, and further used as a primary blasting process as a secondary blasting process. It is characterized in that the surface is processed with a projection material finer than the projection material, and the primary and secondary blast surfaces are mixed with the secondary blast surface.

  The invention of claim 2, which was made to solve the same problem, is a ground surface treatment method for a base material surface to be coated, and the base material surface has a diameter of 0.8 mm or less as a primary blast treatment of 0.2 mm or less. After projecting a spherical projection material or polygonal projection material that is larger than the diameter, it is scraped off by the polishing method so that a part of the depth of the blast mark remains, and from the projection material used for the primary blast as the secondary blast The surface is treated with a fine projection material to form a surface in which primary, secondary blast surfaces and secondary blast surfaces are mixed.

  The invention of claim 3, which was made to solve the same problem, is a ground surface treatment method for a base material surface to be coated, and the base material surface has a diameter of 0.8 mm or less as a primary blast treatment of 0.2 mm or less. A spherical projection material or polygonal projection material of a diameter or larger is projected, shot peening is performed by a projection process of full coverage or more, and then a part of the depth of the dent after shot peening is left by a polishing method. The surface of the primary shot peening surface was subjected to secondary blasting, and the secondary blast surface was mixed. It is characterized by having a surface.

  Furthermore, the invention of claim 4 made to solve the same problem is a method for ground treatment of a base material surface on which a coating is applied, and the primary treatment of the base material surface is a diameter of 1.2 mm or less and a diameter of 0.2 mm or less. The above-mentioned polygonal projection material is projected, shot peening is performed by a projection process of full coverage or more, and then the grinding process is used to scrape off a part of the depth of the dent after shot peening. The surface of the primary shot peening treatment surface mixed with the secondary blast treatment surface, and the secondary blast treatment surface It is characterized by having a surface mixed with. The invention of claim 5 is characterized in that the method of claim 3 or 4 is made for coating diamond-like carbon (DLC).

  The invention of claim 6 is directed to a base material, and has a surface that has been surface-treated by any of the methods of claims 1 to 4, and the invention of claim 7 is a metal or A ceramic product or a ceramic composite product is a target, and a surface treatment is performed by the method of claim 5, and the treated surface has a surface coated with diamond-like carbon (DLC).

  According to the above-mentioned present invention, when applying various coating films such as coating or DLC film on the surface of the base material, the surface of the base material is preliminarily treated so as to obtain a fine and blasted skin in consideration of adhesion. Therefore, the adhesion between the coating formed on the surface and various coating films and the base material is remarkably improved, and a film processing that can withstand use under severe use conditions can be achieved. In addition, the blasted surface by the method of the present invention is used for the primary treatment as a secondary treatment by adding polishing after the primary treatment as compared to the conventional blasted surface in which irregularities are mainly formed using one type of projection material. Since the surface roughness over the entire surface is reduced by using a finer projection material than the applied projection material, cracks are not generated in the coating or coating film, and the absolute amount of the coating or coating film can be reduced. Material costs for the material can be reduced.

  In addition, this processing method is a simple processing method, and the manufacturing management method is also simple, so that the entire manufacturing cost is reduced. As described above, according to the present invention, it is possible to obtain excellent effects that the coating quality is high and the manufacturing cost is low. In particular, molds and tools for press work are used under high loads and high surface pressures, so various coating films are selected and applied according to the usage conditions, but they cannot withstand repeated use and have a short life. Although there were problems, these problems can be solved by applying the parts manufactured by the processing method of the present invention.

  The invention according to claim 1 relates to a method for treating a base material surface of a base material on which coating or coating is performed. As the base material, it is common to select a metal according to the application. As shown in the flow of FIG. 1, a spherical projection material or a polygonal projection material having a diameter of 0.2 to 2.5 mm is first projected as a primary blast treatment on the surface of the base material. Here, the diameter of the projection material is set to 0.2 to 2.5 mm. When the diameter is smaller than this, it is difficult to give a dent having a sufficient depth on the surface of the base material. This is because the depth becomes excessive and cracks are likely to occur in the coating film.

  As a result, a dent having a cross-sectional shape as shown in FIG. 2 (a) is given to the surface of the base material, and the substrate is scraped off so that a part of the depth of the dent by the primary blasting process remains by the polishing method. ), And a secondary blast process is performed with a projection material finer than the projection material used for the primary blast process. As a result, as shown in FIG. 2C, the secondary blast is applied on the surface (primary and secondary blast surface) 1 on which the secondary blast is applied on the primary blast surface and on the polished flat surface. A surface mixed with the surface (secondary blast surface) 2 is obtained.

  FIG. 3 is an enlarged cross-sectional view of the base treatment surface obtained by the method of the present invention. Fig. 4 (a) shows a ground treated surface blasted using one type of conventional projection material, and Fig. 4 (b) shows a mixture of blast materials with different shapes, or blast treatment with different shapes. It is a cross-sectional enlarged view of a base treatment surface obtained by a conventional method in which primary and secondary are respectively projected and blasted. The surface treated by the conventional blast treatment has a tip that causes cracks in the coating film, whereas the surface treated by the method of the present invention has no sharp tip and the adhesion of the coating film. It is characterized in that it has a deep valley (A part) that contributes to improvement. Further, the amount of polishing can be changed according to the type of coating film. This makes it possible to perform optimum ground processing for each coating film. The amount of dents due to blast remaining on the polished surface is selected according to the type of coating film, but is preferably selected from 5% to 70%, more preferably from 5% to 30%.

  In the invention of claim 2, as shown in the flow of FIG. 5, the primary blast to the surface of the base material to be coated is made of a spherical projection material having a diameter of 0.8 mm or less and a diameter of 0.2 mm or more or a polygonal shape. This is done using a projection material. Subsequent steps are the same as those of the first aspect of the invention. Thus, in the invention of claim 2, by using a projection material having a diameter of 0.8 mm or less and 0.2 mm or more, it is possible to obtain a ground surface that is more uniform than the invention of claim 1.

  In the invention of claim 3, as shown in the flow of FIG. 6, as a primary blast treatment on the surface of the base material to be coated, a spherical projection material having a diameter of 0.8 mm or less and a diameter of 0.2 mm or more or polygonal A projection material is projected, and shot peening is performed by a projection process of full coverage or more. Here, the full coverage means a machining state in which there is no gap between the dents and the initial surface of the base material is not left, and the machining time to reach the full coverage is called a full coverage time. Coverage is a value indicating the degree of blast processing, and is defined as coverage C = B / A (%) from the total processing area A of the base material and the total area B of the dents included in the projection material included in A. Yes. FIG. 7 shows the surface states of 50% coverage, 70% coverage, and full coverage.

  In particular, the base strengthening method for the base material coated with diamond-like carbon generally requires a blasting finish to provide full coverage in order to remove rust, oxide scale or foreign matter on the base material surface and activate the surface. It has been proved by experiments so far that rust, oxide scale or foreign matters remain in the processing that does not reach full coverage, and the adhesion between the diamond-like carbon film and the base material is significantly insufficient due to this cause.

  Then, it is scraped off by a polishing method so that a part of the depth of the dent after shot peening remains, blasted with a projection material finer than the projection material used for the primary treatment as the secondary treatment, and the primary shot as before A surface obtained by mixing a surface subjected to secondary blasting on the peening surface and a secondary blast surface is obtained.

  In the invention of claim 4, as shown in the flow of FIG. 8, as a primary blast treatment on the surface of the base material to be coated, a spherical projection material having a diameter of 1.2 mm or less and a diameter of 0.2 mm or more or a polygonal projection material A projection material is projected, and shot peening is performed by a projection process of full coverage or more. After that, it is scraped off by the polishing method so that a part of the depth of the dent after shot peening remains, and the base reinforcement treatment is performed with a diameter of 0.2 mm or less of the polygonal projection material finer than the projection material used for the primary treatment as the secondary treatment I do. Thus, although the size and shape of the projection material are different from those of the invention of claim 3, a surface in which the secondary blast treatment surface is mixed with the primary shot peening treatment surface and the surface in which the secondary blast treatment surface is mixed is obtained. This is the same as the invention of claim 3.

  The inventions according to claims 3 and 4 are particularly suitable as a base treatment method for coating a diamond-like carbon film, and can achieve excellent results as shown in the following examples.

  In the following, the method for strengthening the base material of the base material coated with diamond-like carbon (DLC) will be described. The base material is a high hardness and high toughness cold work tool steel (equivalent to die steel) having a surface hardness of HRC 60 to 63. The primary blasting to the base material uses a polygonal projection material with a diameter of 0.2 to 0.3 mm, blasts over the entire surface of the base material, and the amount of dents is in a state where there is no gap between the dents A full coverage finish with no initial base material remains. The blasting time of the present invention was carried out at 3 times the full coverage time, and the surface activation and surface roughness adjustment were sufficiently performed.

  Subsequently, the above blast surface was polished with a polishing disk. Polishing was performed so as to leave a valley portion A (see FIG. 7) of the dent generated by the blasting process described above. The polished surface and valley dimension h after polishing were 3 to 5 μm. There are no special processing conditions for polishing. Secondary blasting uses a polygonal projection material having a diameter of 0.04 to 0.08 mm and is blasted over the entire surface of the base material, and the amount of dents on the surface of the base material with no gaps between the dents. Full coverage with no polished surface left. The surface roughness after secondary blasting was 1.5 to 2.2 μm in terms of average roughness.

  A diamond-like carbon film (DLC film) is directly formed on the surface of the concavo-convex shape reinforced in this way. In producing the DLC film, the production method is not particularly limited, and any known method such as sputtering or ion plating may be used. The film thickness of the DLC to be produced may be selected from the range of, for example, 0.1 to 300 μm in consideration of the application purpose, use conditions such as the load per unit area applied to the DLC film at the time of application, or the life. The DLC film of the present invention was produced under the following conditions, and the film thickness was 1 μm.

Deposition conditions:
Pretreatment: baking at 150 ° C. for 60 minutes. Ar Bombard (50min)
Using gas and flow _{rate: C 6 H 6 · 2cc /} min
Deposition method: Ionization deposition substrate by electron impact Voltage: 2 kV, 50 mA
Degree of vacuum: 1.5 × 10 ³ Pa
Substrate temperature: 149-168 ° C
Deposition time: 150 min

  Next, in order to examine the adhesion of the DLC film obtained under the above-mentioned film formation conditions, this sample was subjected to a friction test using a ball-on-disk basic friction tester. For comparison, a DLC film was directly formed on a conventional blasted product in the same manner as described above, and a friction test was performed. FIG. 9 schematically shows the main part of the testing machine, 3 is a rotating disk as a sample, 4 is a test ball on the fixed side, and three hard balls are arranged on the jig 5 at equal intervals. The entire jig is pressed against the rotating disk 3 so that a vertical load is applied.

The specifications of the basic friction tester are as follows.
Fixed side test ball: 1/4 inch in diameter, material SUJ2, number of 3 Rotating side: 36 mm in diameter
Rotational speed: V = 160mm / sec, rotational speed N = 1-100rpm
The friction conditions are as follows.
Friction diameter: 30mm
Friction speed: 31mm / s
Vertical load: 100, 200, 400, 600, 800, 1000 N (sliding continuously every 10 minutes for each vertical load)
Atmosphere: In air Lubrication condition: No lubrication

  Prior to the experiment, the surface of the ball and the sample was degreased with acetone and dried before being used in the experiment. In the test, each vertical load was continuously slid for 10 minutes, and the peel resistance was evaluated using the load when finally peeled as the peel load. The presence or absence of peeling was evaluated by changing the friction coefficient and observing the sample surface with a microscope. Those that did not peel until 1000 N were replaced with new balls at this stage, a vertical load of 1000 N was applied again, and a sliding test was conducted for 30 minutes. In the case where peeling of the film did not occur even after 30 minutes, the ball was replaced with a new one again, and similarly, a sliding test was conducted for 30 minutes in total for 3 hours. The test results under the above conditions are shown in FIG. Further, FIG. 10B shows the result of the same test performed on the base material processed by the conventional method. It can be seen that the parts using the ground reinforcement method of the present invention show a lower coefficient of friction than those processed by the conventional method shown in FIG. It can also be seen from Table 1 that it has excellent adhesion. In the table, “◯” indicates that no peeling occurred, and “×” indicates the occurrence of peeling.

  With the present invention, a cemented carbide alloy or a ceramic base material having a ceramic coating as an intermediate layer was also tested, and the same effect as described above was obtained. The metal product in the present invention refers to a metal product that requires industrial wear resistance such as a press mold, a punch mold, and the like, and a cemented carbide alloy coating as an intermediate layer. Refers to press molds that process high-hardness materials, and ceramic products are industrial wear resistance such as molds such as hole dies that draw materials with low hardness and low yield point, such as stoppers for bottle containers. Ceramic products that require

  The following four synergistic factors can be considered as factors for improving the adhesion of the DLC film according to the present invention. First, the surface of the base material is activated by irradiating the surface of the base material with a blasting material so that it is at least full coverage, thereby removing rust, oxide scale and deposits. Furthermore, the primary blasted part was polished and then secondary blasted again to generate countless mountain-shaped irregularities, and the surface was further activated to make the DLC film easy to adhere. Secondly, the surface area of the base material is increased by the concave portion of the h dimension portion shown in FIG. 3 (b) and the uneven portion finer than the h dimension formed by the secondary blast, which remains after the primary blasting → polishing process. The substantial adhesion area of the DLC film has increased, and the adhesion force of the DLC film has increased accordingly. Third, when a DLC film is formed on the innumerable irregularities formed by blasting as described above, a part of the DLC film enters the irregularities and, when used as a post-deposition part, the DLC film is applied. The frictional force, etc. applied to the surface parallel to the surface makes it difficult to slip between the base material and the DLC film, making it difficult to come off. Fourth, since the primary blasting is polished and then the secondary blasting is performed using a fine projection material, the numerical value of the height of the unevenness is narrower than the treated surface of only the primary blast, and the unevenness Since the number of peaks is remarkably large, the load applied to the formed DLC film is more easily and easily received, and the surface is more advantageous without burdening the DLC film.

  In addition, as described above, polishing is performed after primary blasting, and then secondary blasting is performed using a fine projection material, so that the numerical width of the height of the unevenness is narrower than the treated surface of only primary blasting. As a result, the undulation on the surface of the coated DLC film is also smaller than in the case where only the primary blast treatment is performed. As a result, as shown in FIG. It is a thing. From the above, the ground reinforcement method of the present invention is remarkably effective in improving the adhesion of the DLC coating and lowering the friction coefficient, and in particular, the peel resistance is remarkably improved and the low friction coefficient is obtained. It can be said that it is a useful processing method as a base processing method for plastic processing by non-lubrication under pressure, for example, DLC coating on the surface of a mold that rubs against a workpiece.

It is a flowchart of invention of Claim 1. It is an expanded sectional view which shows the cross-sectional change of the base material in this invention. It is an expanded sectional view of the base material processed by this invention method. It is an expanded sectional view of the base material processed by the conventional method. It is a flowchart of invention of Claim 2. It is a flowchart of invention of Claim 3. It is a conceptual diagram of coverage by blasting. It is a flowchart of invention of Claim 4. It is a schematic diagram of the principal part of the testing machine used for the Example. (A) is a graph showing the test load of the test piece strengthened by the treatment method according to the present invention and the change in the coefficient of friction over time, and (B) shows the same test result of the test piece strengthened by the treatment method according to the prior art. It is a graph.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Primary and secondary blast surface 2 Secondary blast surface 3 Rotating disc as sample 4 Test ball on fixed side 5 Jig

Claims (7)

  A method of ground treatment of a base material surface to be painted or coated, after projecting a spherical or polygonal projection material having a diameter of 0.2 to 2.5 mm as a primary blast treatment on the base material surface , Scraped off so that part of the blast depth of the blast remains with the polishing method, and further processed with a projection material finer than the projection material used for the primary blast treatment as the secondary blast treatment, the primary and secondary blast surfaces A base material surface treatment method characterized in that the surface is a mixture of a secondary blast surface.   A ground surface treatment method for a base material surface to be coated, after projecting a spherical projection material having a diameter of 0.8 mm or less and a diameter of 0.2 mm or more or a polygonal projection material as a primary blast treatment on the surface of the matrix The surface is removed by grinding so that a part of the depth of the blast marks remains, and the secondary blast is treated with a finer projection material than the primary blasting material, and the primary, secondary blast surface and secondary blast surface. A surface treatment method for the surface of a base material, characterized in that the surface is a mixed surface.   A base material surface treatment method for coating a base material surface, and projecting a spherical projection material or a polygonal projection material having a diameter of 0.8 mm or less and a diameter of 0.2 mm or less as a primary blast treatment on the base material surface, Shot peening is performed with a projection process of full coverage or higher, and then the grinding process is used to scrape off part of the depth of the dent after shot peening. A ground surface treatment method for a base material surface, characterized in that a surface obtained by blasting with a material and subjecting a primary shot peening treatment surface to secondary blast treatment and a secondary blast surface is mixed.   A base material surface treatment method for coating a base material surface, and projecting a polygonal projection material having a diameter of 1.2 mm or less and a diameter of 0.2 mm or more as a primary treatment on the surface of the base material. Shot peening, then scrape off by polishing method so that a part of the depth of the dent after shot peening remains, 0.2mm smaller than the projection material used for the primary treatment as a secondary treatment 0.2mm Substrate reinforcement treatment at a diameter or less, and a surface treatment of the base material surface characterized by a surface in which the secondary blast treatment surface is mixed with the primary shot peening treatment surface and a surface in which the secondary blast treatment surface is mixed Method.   5. A base material surface treatment method, wherein the method according to claim 3 or 4 is performed for coating diamond-like carbon (DLC).   A base material having a surface that has been surface-treated by the method according to claim 1. A metal, a ceramic product, or a ceramic composite product, characterized by having a surface treated by a method according to claim 5 and having a treated surface coated with diamond-like carbon (DLC).

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