JP5804589B2 - Coated mold or casting member having excellent sliding characteristics and method for producing the same - Google Patents

Description

The present invention is, for example pressing, went a die for forging, relates coating die or casting member sliding characteristics are required, such as wear resistance and galling resistance in sliding environment with the workpiece It is.

  In recent years, tools such as molds and drills have been used more severely, and further life improvement is required. Among these, wear such as wear and galling is caused by sliding of the work surface of the tool and the workpiece, and is particularly noticeable in plastic working tools such as press working and forging dies in a severe sliding environment. In view of this, a technique for improving the wear resistance and galling resistance of the work surface by applying various surface treatments to the work surface of the tool has been widely implemented. In particular, the coating (coating) method can coat a hard film with a Vickers hardness exceeding HV1000 and has excellent adhesion to the substrate surface, so the life of the coated tool to which it is applied is greatly improved. .

For example, titanium carbide coated by chemical vapor deposition (CVD) (represented by TiC as an elemental structure; hereinafter the same), VC coated by salt bath, physical vapor deposition (PVD) All coatings of HV2000 or more, such as TiCN, TiC, VCN, VC, and AlCrN coated by the above method, have been put into practical use. Among various types of coating means, the PVD method that enables the temperature during coating to be a low temperature equal to or lower than the tempering temperature is effective for coating the tool.
In the mold for plastic processing, where the work material has high strength, the processed product has high precision, and the molding cycle speed is increasing, the load on the work surface is particularly increased, so a hard coating is formed. In many cases, TiCN or TiC having a high hardness and a low friction coefficient is used for cold working.

Recent molds are required to have excellent heat resistance so as to be able to cope with hot working in addition to further strengthening the work material and making the mold complex. On the other hand, as the hard film using the PVD method for the mold, the third element is added to the AlCr-based nitride film having excellent wear resistance and oxidation resistance, for example, There are AlCrSi-based nitride films (Patent Documents 1 and 2). Further, the hard film of the cutting tool includes an AlCrV-based nitride film (Non-Patent Document 1) and an AlVCrSi-based nitride film. (Patent Document 3)
Furthermore, a laminated structure of AlCr nitride and V nitride is disclosed as a hard coating suitable for a cutting tool and a sliding member. (Patent Document 4)

JP 2005-042146 A Japanese Patent Laid-Open No. 2003-321764 JP 2005-262388 A Japanese Patent Laid-Open No. 2005-256081

R. Franz et al., “Influence of phase transition on the tribological performance of arc-evaporated AlCrVN hard coatings, Surface & Coatings Tech. 1101-1105

In order to further improve the life of the coated tool, it is necessary to combine the above-mentioned hard coating with excellent wear resistance, heat resistance and sliding characteristics.
In this case, the AlCrSi-based nitride films of Patent Documents 1 and 2 have high hardness and excellent heat resistance, but have a large frictional resistance during product molding, and there is room for improvement in sliding characteristics. The AlCrV-based nitride film described in Non-Patent Document 1 is excellent in heat resistance and sliding characteristics, but has low film hardness and a problem in wear resistance. And even if it is the AlVCrSi type | system | group nitride film of patent document 3, the multicomponent system component adjustment is not easy but a subject remains. Furthermore, even if the laminated structure of AlCr nitride and V nitride of Patent Document 4 is used, there is room for improvement in wear resistance.

Therefore, the present invention has an object to provide a coated mold or a casting member that is excellent in sliding characteristics on a work surface even in a cold to hot working environment, and is optimal for a plastic working mold , and a method for manufacturing the same. To do.

The present inventors have paid attention to the wear mechanism that occurs in the hard coating in a coated mold or casting member in a sliding environment with the workpiece. The wear mechanism of hard coatings is caused by wear due to low hardness and heat resistance of the coating itself, and damage caused through the deposits due to local adhesion of the workpiece. I found out that there was. Therefore, as a result of research on a technique capable of simultaneously suppressing both of these wears, it was found that there is an advantageous film form for this suppression, and there is an element configuration and a film structure to express it.

That is, the present invention is, on the surface of the die steel or high speed steel of the base material, and a nitride of AlCrSi, nitrides of V is a coated mold or casting member hard film was coated stacked alternately A coating die or casting member having excellent sliding characteristics, wherein the hard coating has a film thickness of 3 μm or more, surface roughness Ra <0.2 μm, Rz <2.0 μm, and Rsk <0. Moreover, it is preferable that the film thickness of the hard coating is 8 μm or more because the life of the coating mold or the casting member can be greatly improved.
A nitride of AlCrSi stacked alternately, each film thickness of the nitride of V, rather than the film thickness of the nitride AlCrSi, it is preferred towards the film thickness of the nitride of V is thick. Further, a nitride AlCrSi stacked alternately, each film thickness of the nitride of V, rather than the film thickness of the nitride AlCrSi, film thickness of the nitride of V is 1.5 times or more Is preferred. These hard coatings are more preferably coated by physical vapor deposition.
The manufacturing method of the present invention, the surface of the die steel or high speed steel of the base material, coated with a nitride of AlCrSi by physical vapor deposition method using an alloy target of AlCrSi in a nitrogen atmosphere, V in a nitrogen atmosphere by repeating the coating of nitride of V by physical vapor deposition method using a metal target, covering the nitride AlCrSi, film thickness nitride of V are alternately laminated over the hard coating 3 [mu] m, the hard the surface of the film and buffing with diamond paste, is Ra <0.2μm, Rz <2.0μm, method of manufacturing the sliding characteristics superior coated mold or casting member to Rsk <0.
And nitrides of AlCrSi, film thickness nitrides are stacked alternately in V it is preferable to coat the above hard film 8 [mu] m.
An alloy target AlCrSi, current ratio put into V metal target is preferably alloy target / V metal target AlCrSi is 2.0 or less.

If the present invention, a hard film that is coated on its surface, wear resistance over the cold in the used space between the heat, excellent heat resistance, and since it is excellent in sliding properties, coating dies or It is possible to dramatically improve the life of the casting member .

Sample No. which is an example of the present invention. 1 is a transmission electron microscope observation photograph of a cross section of 1 hard film, and is an example showing the film structure of the present invention. It is an enlarged photograph of the film | membrane surface which shows the damage form of the film | membrane by the ball-on-disk test of this invention example and a comparative example, and is an example which shows the effect of this invention.

  One of the important features of the present invention is that an optimum combination of element configurations and a coating structure capable of simultaneously suppressing wear due to the two types of mechanisms in the coated tool have been found. In other words, in order to suppress these wears, the hard coating itself is not only excellent in wear resistance and heat resistance, but also particularly excellent in sliding properties with the work material is effective in suppressing the above wear. is there.

Then, it was found that a nitride of AlCrSi excellent in abrasion resistance and heat resistance, and a nitride of V excellent in sliding properties to the laminated structure. By adopting a laminated structure, the nitride of V in the usage environment of the mold or casting member forms V oxide with excellent sliding characteristics on the surface of the coating, and the wear resistance of the nitride of AlCrSi The sliding characteristics can be greatly improved without impairing the heat resistance. Furthermore, in order to exert these effects, the inventors have found that there is an optimum film thickness and surface state of the laminated structure, and have reached the present invention. The details will be described below.

Since the nitride of AlCrSi has a high hardness of HV3000 or higher, has excellent wear resistance, and also has excellent heat resistance, it is possible to suppress damage in the form of wear. However, according to the study of the present inventor, even in nitride AlCrSi having excellent heat resistance and abrasion resistance, under severe sliding environment, with a film surface in that in use, locally workpiece It has been found that the film tends to adhere, the sliding resistance becomes uneven on the surface of the film, and galling and seizure may occur, resulting in damage to the film. In particular, when the work material is Fe-based, Fe oxide generated from the work material may damage the coating surface.

On the other hand, when a compound mainly composed of V is suitably oxidized in the temperature range of 25 to 200 ° C. and formed as a thin oxide layer on the surface of the base material, the nitride of V becomes a counterpart material ( In order to reduce the affinity with the workpiece, it was confirmed that the sliding properties are excellent.
And even when the workpiece is Fe-based, the oxide of V reacts with the Fe oxide and softens the Fe oxide, so the aggression to the film is reduced and the sliding resistance is suppressed, Furthermore, it has been found that the microcrystalline Fe oxide adheres thinly and evenly immediately above the V oxide formed on the surface of the film, so that the Fe oxide itself is also caused by the improvement of the sliding characteristics.
In the above-mentioned tool coated with the nitride of V, adhesion of the workpiece to the surface of the coating during use can be reduced, so that tool wear due to the mechanism can be suppressed. However, since the oxidation of the nitride of V further proceeds in the operating temperature range of approximately 300 ° C. or higher, it continues to contribute to the prevention of wear due to the formation of the oxide film. Helps wear.

In order to solve this problem, the above-described wear and tear can be achieved if V can be added to provide excellent sliding characteristics without impairing the characteristics of the hard film having excellent wear resistance and heat resistance. While introducing the suppression effect, this hard coating can be used continuously and stably even in the use region between warm temperatures.
In this case, Ti-based carbides and nitrides have a high hardness of HV3000 or higher, so they have excellent wear resistance, but their own oxidation temperature is low, so if the working surface temperature of the mold rises, the wear of the film Is easy to progress. On the other hand, in the nitride of AlCrSi, because high hardness of more than HV3000 is obtained, excellent abrasion resistance, and since it is also excellent as heat resistance as described above, there is no above-mentioned problem of concern to the Ti-containing carbide such as . However, since the oxidation as seen in the nitride of V does not occur, it alone has poor sliding characteristics, and it is difficult to cope with local wear caused by adhesion of the workpiece.

Accordingly, the present invention includes a nitride AlCrSi, by a hard coating composed of a laminated structure of a nitride of V, have a good sliding operation of the nitride of V to produce an oxidized protective coating, a wear-resistant found can be imparted without impairing the properties of the nitride of AlCrSi having excellent heat resistance. As a result, excellent wear resistance, heat resistance, and sliding characteristics are simultaneously achieved over the use range between cold and hot. The mold or casting member of the present invention having the above characteristics in a well-balanced manner can suppress the occurrence of unevenness on the sliding surface of the film even in each temperature environment during use, and has low attack on the workpiece. Thus, damage such as galling that occurs during sliding can be suppressed, and the life of the mold or casting member can be improved.

A nitride of AlCrSi employing the present invention, to more effectively express both characteristics of the multilayer coating that individual nitride layer of a nitride of V is preferably a thickness of nanometer level. The preferred thickness of this case, the film thickness of the nitride AlCrSi is at 100nm or less, the film thickness of the nitride V is 100nm or less.
In order to obtain sufficient sliding characteristics under use environment of the mold, a nitride AlCrSi stacked alternately, each film thickness of the nitride of V, rather than the film thickness of the nitride AlCrSi, The film thickness of V nitride is preferably thicker. If the thickness of the V nitride is 1.5 times or more than the thickness of the individual AlCrSi nitride, it is more preferable because the oxide of V that enhances the sliding characteristics is sufficiently generated. . If the thickness of the nitride of V becomes too thick, the wear resistance may deteriorate depending on the use environment. The thickness of the nitride of V is not more than 4.0 times the thickness of the nitride of AlCrSi. It is preferable that

In the present invention the ratio adjustment of each constituent element, the metal composition component of nitrides of V is fixed in one element of V, to adjust the composition of the nitride of the other AlCrSi the predetermined ones Is the best. At this time, the ratio of each element type constituting the nitride of AlCrSi is Al _a Cr _b Si _c N (where a, b, and c indicate atomic ratios, and a + b + c = 1), , B, c ≠ 0 and a + b> 0.5. More preferably, a + b> 0.8. It is more preferable that the content of Al having excellent heat resistance is larger than that of Cr.

The film thickness of the hard film is 3 μm or more.
In press molding, since the force applied from the film surface is large, if the film is thinner than this, the film strength becomes poor and the film is easily damaged. In particular, in a high stress environment, to join a large force at the interface of the film and the substrate, from the difference between the film and the elastic deformation amount of the substrate, the film peeling and film damage easily occurs, the mold or casting member life The influence of the film thickness on the thickness increases. Therefore, the film thickness is preferably 8 μm or more under a high load environment.
When the film thickness of the hard film becomes too thick, film peeling may easily occur, and the film thickness is preferably 20 μm or less. More preferably, it is 15 μm or less.

The surface roughness is Ra <0.2 μm, Rz <2.0 μm, and Rsk <0.
The surface of the hard coating contains droplets, coating defects, impurities, and the like, and is not suitable for use as a mold or a casting member , so it needs to be smooth. In particular, when the film is thick, the surface roughness decreases due to accumulation of droplets and film defects, so the surface of the film needs to be smooth.
Under the sliding environment, the convex portion on the surface of the film is the starting point, and adhesion of the work material occurs, resulting in film peeling or wear. Therefore, it is most important to reduce the convex portions.
Therefore, only Ra and Rz, which are general surface roughnesses (ISO4287-1997), are insufficient to grasp the frequency of the convex portions, and in addition to Ra and Rz, control of Rsk is important. .
The surface roughness Rsk value (ISO4287-1997) is a parameter indicating the objectivity with respect to the center line of the amplitude distribution curve. For example, when the surface of the film has many concave portions, Rsk <0 is indicated, and when there are many convex portions, Rsk> 0 is indicated, and the frequency of the convex portions and the concave portions can be managed.
By controlling the surface roughness within the above range, in the coated tool including the V nitride layer, the V oxide formed on the surface of the base material under the use environment of the tool is very thinly formed. Therefore, the sliding characteristics are improved. When the workpiece is Fe-based, the sliding property can be improved by allowing the Fe oxide to be thinly and uniformly deposited on the entire V oxide on the V oxide.

The above-mentioned hard coating employed by the present invention is not particularly limited with respect to the coating method. However, considering the heat effect on the base material of the mold or casting member , the fatigue strength of the product , the adhesion of the film, etc., if the base material is die steel or high speed steel, the temperature is lower than its tempering temperature. It is preferable to use a physical vapor deposition method (PVD method) such as an arc ion plating method or a sputtering method in which the film can be formed by a method and compressive stress remains in the film.

In the present invention, when a laminated film is formed by employing the PVD method, a V (vanadium) metal target can be used for the film formation. The V metal target has an advantage that it has good workability and is easy to manufacture. Thus, the surface of the base material of the mold or casting member, the coating of the nitride AlCrSi by physical vapor deposition method using an alloy target of AlCrSi in a nitrogen atmosphere, a physical vapor deposition using a V metal target in a nitrogen atmosphere By repeating the coating of the nitride of V by the method, the coating mold or casting member of the present invention can be easily obtained.
More specifically, two or more types of targets each consisting of a simple V metal that is easy to manufacture and an AlCrSi alloy with adjusted components are prepared. And the PVD apparatus by which a target component is coat | covered alternately with the structure where a base material rotates in the center which a some target surrounds can be used. At this time, by adjusting the film forming atmosphere to nitrogen, when the surface of the rotating substrate passes the front surface of the AlCrSi alloy target , the nitride of AlCrSi is coated, and when passing the front surface of the V metal target, V The nitride can be coated.

  In order to achieve the surface roughness of the present invention, a polishing method after coating is important. With the conventional coating polishing methods such as polishing with abrasive paper and polishing with media made of resin and diamond particles, the surface roughness of Ra and Rz is smoothed, but the protrusions can be reliably reduced. It's not easy. Therefore, it is preferable to perform buffing using a diamond paste to reduce the number of protrusions and efficiently reduce the value of Rsk as well as Ra and Rz.

In the physical vapor deposition method using a target, since the coating rate differs depending on each component of the target, the individual film thickness can be controlled by controlling the current applied to the target. The alloy target and V metal target AlCrSi used in the present invention, towards the metal target of V is due to the high deposition rate than alloy target AlCrSi, than the thickness of the nitride AlCrSi, nitrides V The film thickness tends to be a thick film.
Therefore, in order to obtain sufficient lubricating properties under tool use environment than the thickness of the nitride AlCrSi, in the direction of thickness of the nitride of V and thick film, an alloy of AlCrSi target and V metal The ratio of the current supplied to the target is preferably 2.0 or less for the alloy target of AlCrSi / V metal target. In this case, may be a smaller current to be introduced into the alloy target AlCrSi, it may increase the current to be introduced into the V metal target. More preferably, it is 1.5 or less.
In order to ensure a constant film formation rate, the current input to the target is preferably 80 A or more. If the current applied to the target becomes too large, the film formation is difficult to stabilize, so it is preferable to set the current to 160 A or less.

Hard coating employed in the present invention includes a nitride of each of AlCrSi, has a compound structure of a nitride and V, can exhibit its properties by the optimum film thickness and surface condition. Therefore, a nitride AlCrSi, some or all carbonitride nitride and V, effect effects of the present invention though the form of the oxycarbonitride was being exerted.

In Example 1, the characteristics of the coating composition were evaluated with a ball-on-disk tester.
As the base material to be surface-treated, a disk-shaped test piece (diameter 20 mm × thickness 5 mm) of high-speed steel SKH51 specified by JIS was prepared. This was tempered to 64 HRC by tempering at 540 to 580 ° C. after quenching by cooling with nitrogen gas from heating and holding at 1180 ° C. in vacuum. These flat surfaces were mirror-polished to a surface roughness Ra of 0.016 μm, Rz of 0.016 μm, and Rsk−0.116, and then subjected to alkali ultrasonic cleaning.

  An arc ion plating method was used as the film forming means. The film formation is performed using a PVD apparatus having a structure in which the substrate rotates around the center surrounded by a plurality of targets, and the first and second targets shown in Table 1 are installed in the arc evaporation source. Then, the substrate was placed on a plate having a rotation mechanism on a jig table having a planetary mechanism in the chamber. The table and the plate on the table rotate independently of each other.

Next, heat degassing was performed in a vacuum at a temperature of 773 K and 1 × 10 ⁻³ Pa in an arc ion plating apparatus having a chamber volume of 1.4 m ³ (the insertion space for the processed product is 0.3 m ³ ). Thereafter, cleaning with Ar plasma was performed at a temperature of 723K. Then, nitrogen in the reaction gas was introduced into the apparatus, and arc discharge was generated on various targets. Under 723 K, the reaction gas pressure was 3 Pa, the table rotation speed was 5 rpm, and the base material during coating was -100 V. A bias voltage of Moreover, each film thickness ratio was adjusted by changing the electric current supplied to the V metal target.
Sample No. 1 to 5, the total film thickness of the hard coating is about 3.5 μm. 6 and 7, the film formation time was adjusted so that the total film thickness was about 8 μm. Table 1 shows the film forming conditions.

The coated surface was smoothed by buffing using a diamond paste having a particle diameter of 3 μm so that the sample had a predetermined surface roughness. And the surface roughness Ra, Rz, Rsk value of the film surface of each sample uses a stylus type roughness meter (SURFCOM 480A manufactured by Tokyo Seimitsu Co., Ltd.), an evaluation length of 4 mm, a measurement speed of 0.3 mm / s, The measurement was performed under the condition of a cut-off value of 0.8 mm.
The hardness of the coating surface was measured with a load of 150 kgf using a Vickers hardness tester (HM100 manufactured by Mitutoyo Corporation).
The average film thickness of the laminated film was measured by transmission electron microscope observation. The total film thickness was measured with an electron microscope. Table 2 shows each measurement result.

Sample No. 1 in which AlCrSi nitride layers and V nitride layers were alternately laminated. 1 to 3 had a hardness of HV3000 or higher. As the thickness of the V nitride layer increased, the hardness tended to decrease. Sample No. The V nitride of 5 had a hardness of HV2100, which was lower than that of the film containing the AlCrSi nitride.
The individual film thicknesses that were alternately stacked were obtained from the average of the film thicknesses of 10 adjacent layers in the measurement region.
Sample No. Individual film thickness of 1 of the laminated coating, nitride layer of about 3nm of AlCrSi, nitride layer V is had a thickness of about 6 nm. In FIG. 1 is a cross-sectional observation photograph of a film by a transmission electron microscope.
Sample No. 2, the nitride layer of AlCrSi about 3 nm, the nitride layer of the V is had a thickness of about 4.5 nm. Sample No. 3, a nitride layer of AlCrSi about 3 nm, the nitride layer of the V is had a thickness of about 3 nm. Sample No. 6, nitride layer AlCrSi about 3 nm, the nitride layer of V was about 6 nm.
The surface roughness of each sample was Ra <0.2 μm, Rz <2.0 μm, and Rsk <0.

  Sample No. About 1-7, the sliding characteristic when an other party material was set to JIS bearing steel SUJ2 was evaluated. As a test condition, a ball-on-disk tester (Tribometer manufactured by CSM Instruments) was used. The disk-shaped test piece was rotated at a speed of 150 mm / sec while pressing SUJ2 balls (diameter 6 mm) against the coating film with a load of 2 N in the atmosphere of 25 ° C. (normal temperature) to 400 ° C. The test distance was 100 m, and the friction coefficient was an average value of 10 m, 20 m, 30 m, 40 m, 50 m, 60 m, 70 m, 80 m, 90 m, and 100 m. Table 3 shows the wear coefficients of various films at various temperatures.

  Sample No. 2 having a laminated structure of AlCrSi nitride and V nitride. 1 to 3 and 6 are sample Nos. 1 and 2 which are nitrides of V. The coefficient of friction was as low as 5. Sample No. From the comparison of the stacking periods of 1 to 3, the friction coefficient increased as the ratio of the nitride layer of V decreased. Sample No. 1, which is a nitride of AlCrSi not containing nitride of V. Nos. 4 and 7 had higher wear coefficients than the examples of the present invention.

  Furthermore, about the film surface after the said test, the unevenness | corrugation of a film | membrane sliding part was measured on the conditions of 1.5 mm / s with a surface roughness meter (Surfcom 480A by Tokyo Seimitsu Co., Ltd.), The wear state of the film was evaluated. That is, when the surface unevenness value is plus (+), it is an attached form, and when it is minus (−), it means that the film is worn. Table 4 shows the measurement results of the wear state of the film. (FIG. 2 shows an enlarged overview photograph of the coating surface.) Table 5 shows the measurement results of the wear of the mating member φ6 SUJ2 ball.

Sample No. Since 1-3, 6 contains the nitride of AlCrSi which is excellent in abrasion resistance and heat resistance, the unevenness | corrugation of the sliding part decreased in each temperature environment. And since it contains the nitride layer of V which is excellent in sliding characteristics, the wear diameter of the counterpart material is almost the same in each temperature environment, and the aggressiveness to the counterpart material is reduced.
On the other hand, sample No. Nos. 4 and 7 did not contain a V nitride layer having excellent sliding performance, and as shown in Table 4, the counterpart material locally adhered to the surface of the film from a 25 ° C. test environment. As the test temperature increased, the amount of adhesion increased. Further, as the adhesion amount increased, the attacking property against the counterpart material also increased, and the wear diameter of the ball became extremely large as shown in Table 5.
Sample No. In No. 5, local adhesion did not occur, and the opponent aggression was also low as shown in Table 5. However, in the test environment of 200 ° C. or higher, the heat resistance of the film was low, the film was oxidized, and the amount of wear of the film increased as shown in Table 4.
Both the AlCrSiN film and the VN film have large variations in the amount of adhesion of the mating material on the sliding surface or the wear amount of the film at each test temperature, and the AlCrSi nitride and the V nitride of the composition of the present invention The sliding property was inferior compared to the laminated film.

Next, the actual durability was evaluated by a reciprocating frictional wear test in which the load applied to the hard coating was larger, assuming the usage environment of the actual mold.
For the substrate to be surface-treated, a square test of die steel SKD61 as defined in JIS, which was tempered to 45 HRC by tempering at 540 to 580 ° C. after quenching by cooling with nitrogen gas from heating at 1050 ° C. in vacuum. A piece (180 × 20 × 20) was prepared. These planes were mirror-polished to a surface roughness Ra of 0.016 μm, Rz of 0.016 μm, and Rsk−0.116, and then subjected to alkali ultrasonic cleaning.

As the film forming means, the same arc ion plating method as in Example 1 was used. Cleaning with Ar plasma was performed under the same conditions as in Example 1. Then, nitrogen in the reaction gas was introduced into the apparatus, and arc discharge was generated on various targets. Under 723 K, the reaction gas pressure was 3 Pa, the table rotation speed was 5 rpm, and the base material during coating was -100 V. No. 5 was applied to the sample No. 8-No. 19 was coated. The film thickness was changed by adjusting the coating time.
The sample No. 1 was then buffed using a diamond paste having a particle size of 3 μm. The film surface of 8-17 was smoothed.
Sample No. Nos. 18 and 19 were smoothed with # 600 and # 1000 abrasive papers. The film forming conditions are shown in Table 6.

Sample No. whose surface was smoothed About 8-23, the surface roughness and the film thickness were measured by the same method as Example 1. And the frequency | count of damage and the friction coefficient were measured using the reciprocating friction wear test machine (Kyowa Giken Co., Ltd.). SKD61 (45HRC) of φ10 × 16 was used as the mating material to slide. The test was carried out at a measurement load of 200 kgf, a measurement speed of 150 mm / s, a sliding distance of 300 mm reciprocation, test conditions of room temperature and no lubrication.
The number of reciprocating friction and wear tests was up to 300 reciprocations, and the evaluation was performed by the number of times when the film was damaged and the substrate was exposed. The coefficient of friction was obtained by dividing the friction stress during sliding by the measured load.
Table 7 shows the results of various characteristic evaluations.

Among the examples of the present invention, Sample No. with a film thickness of 8 μm or more is used. In Nos. 8 to 14, no film damage occurred even in a reciprocating frictional wear test in which a high load was applied.
Sample No. of the present invention. 15 to 17 are sample Nos. Compared with 8-14, the film thickness was thin, and film damage occurred under a high load use environment.
Sample No. 18 is a sample No. of the present invention example. 9 and Ra and Rz were similar, but Rsk> 0, and there were many convex portions on the coating surface. Therefore, although the film thickness was large, the sliding resistance was high, and the film damage occurred due to the generation of abrasion powder starting from the convex portion.
Sample No. In No. 19, since the surface roughness did not satisfy the range defined by the present invention and the film thickness was not within the preferred range, film damage occurred immediately.

Coated molds or casting member of the present invention, abrasion resistance thereof film surface has excellent heat resistance, since it has sliding properties, can be applied to the sliding components of the various machines.

Claims (8)

On the surface of the die steel or high speed steel of the base material, and a nitride of AlCrSi, a coated mold or casting member nitride coated with hard coating are alternately stacked and V,
A coated mold or casting member having excellent sliding characteristics, wherein the hard coating has a film thickness of 3 μm or more, surface roughness Ra <0.2 μm, Rz <2.0 μm, and Rsk <0. The coated mold or casting member having excellent sliding characteristics according to claim 1, wherein the hard coating has a thickness of 8 μm or more. Claims and nitride AlCrSi stacked alternately, each film thickness of the nitride of V, rather than the film thickness of the nitride AlCrSi, characterized in that towards the film thickness of the nitride of V is thick 3. A coated mold or a casting member having excellent sliding characteristics according to 1 or 2. Wherein a nitride of AlCrSi stacked alternately, each film thickness of the nitride of V, rather than the film thickness of the nitride AlCrSi, the film thickness of the nitride V is 1.5 times or more A coated mold or a casting member having excellent sliding characteristics according to claim 3. 5. The coated mold or casting member having excellent sliding characteristics according to claim 1, wherein the hard film is coated by a physical vapor deposition method. On the surface of the die steel or high speed steel of the base material, coated with a nitride of AlCrSi by physical vapor deposition method using an alloy target of AlCrSi in a nitrogen atmosphere, by physical vapor deposition method using a V metal target in a nitrogen atmosphere By repeating the nitride coating of V,
And nitrides of AlCrSi, film thickness nitride of V are alternately laminated to cover the above hard film 3 [mu] m,
Wherein the surface of the hard film buffing using a diamond paste, Ra <0.2μm, Rz <2.0μm , excellent coated molds or casting member in sliding properties, characterized in that the Rsk <0 Manufacturing method. And nitrides of AlCrSi, for superior coated mold or cast the sliding properties according to claim 6 having a thickness of nitride of V are alternately laminated is characterized by coating the above hard film 8μm Manufacturing method of member . 8. The coating with excellent sliding characteristics according to claim 6, wherein the current ratio of the AlCrSi alloy target and the V metal target is 2.0 or less when the AlCrSi alloy target / V metal target is 2.0 or less. A method for producing a mold or a casting member .