JP6517132B2 - Wear resistance evaluation method - Google Patents

Description

  The present invention relates to a method of evaluating wear resistance.

  2. Description of the Related Art Conventionally, there is known a technique of coating a film on the surface of a metal part or the like in order to improve surface strength and wear resistance. For such a coating film, a method and apparatus for evaluating the properties such as film strength and abrasion resistance are required. In the following Patent Documents 1 to 3, as an example of such an evaluation method and an evaluation apparatus, a wear material in which abrasive grains are mixed in a liquid is sprayed to a test object on which a film is formed, Methods and apparatus for assessing membrane properties by weight loss are disclosed.

  In the following Patent Documents 1 and 2, an ejection unit that ejects a wear material in which abrasive particles are mixed in a liquid to a subject, a storage unit that stores the wear material, and a recovery unit that recovers the wear material after spraying There is disclosed a method of evaluating film characteristics from the relationship between the loss of film due to the collision of abrasive grains and the amount of abrasive grains used, using the provided film evaluation apparatus. Patent Document 3 below discloses a film evaluation apparatus provided with a mechanism for automatically switching between a position where the jetting unit can jet the wear material to the subject and a position where the measurement unit can evaluate the film characteristics. ing.

Unexamined-Japanese-Patent No. 2010-237071 JP, 2010-237073, A JP, 2006-184188, A

  In the method for evaluating the wear resistance of the coating disclosed in the above-mentioned Patent Documents 1 to 3, a test subject of a fixed shape is prepared, the wear material is sprayed toward the flat surface, and the wear amount of the film due to the collision of the wear material is calculated. By measuring, the durability of the film (i.e. the durability of the coated tool) is evaluated. This evaluation method is only performed using a fixed-shaped test subject, not a test subject having the shape of a tool actually used such as a cutting tool. Therefore, conventionally, it is not possible to simulate the wear behavior at the time of actual use of the tool parts in which the wear of the coating particularly easily progresses in the buttocks such as the cutting edge of the cutting tool, etc. It was difficult to carry out the test.

  The present invention has been made in view of the above problems, and an object thereof is an abrasion resistance that enables an evaluation test that simulates the wear behavior during actual use of a member in which the wear of the coating particularly easily progresses in the buttocks. It is to provide an evaluation method.

The wear resistance evaluation method according to one aspect of the present invention is a wear resistance evaluation method for evaluating the wear resistance of the hard coating based on the wear behavior when the wear material is caused to collide with the hard coating that covers the test object. . The above-mentioned abrasion resistance evaluation method includes the steps of preparing a subject having a ridge portion covered with a hard film and having a plurality of adjacent surfaces intersect, and the test so that the ridge portion faces the supply side of the wear material. And installing the body, and evaluating the wear resistance of the hard film based on the wear behavior when the wear material supplied toward the buttocks collides. The step of evaluating the abrasion resistance includes a post evaluation step of measuring the moving speed of the interface between the subject and the hard film after the exposure of the subject .

  The present inventors diligently studied to simulate the wear behavior of the film during actual use of a member such as a cutting tool in which wear of the film is particularly likely to progress at the buttocks of the object. As a result, the following findings were obtained, and the present invention was conceived.

  The wear that occurs when the cutting tool is used is classified into rake wear and flank wear, and in particular, abrasive wear becomes dominant on the rake that slides on the work surface. Rake face wear progresses from the surface of the coating to the interface between the tool and the coating in the thickness direction until the coating on the cutting edge (edge) disappears and the tool surface is exposed, and after the tool is exposed The interface between the tool and the coating advances by gradually moving from the tip of the cutting edge. That is, during actual use of the cutting tool, the film does not wear by itself after the exposure of the tool, but exhibits a complex wear behavior that may also be influenced by the adhesion between the tool and the film. The inventor focused on the above-mentioned wear behavior, in particular, simulating the wear behavior after the exposure of the tool, and as a result of conducting a detailed study, as a result, he headed toward the buttocks of an object such as the cutting edge of the cutting tool. I thought about the method of making the wear material collide.

In the wear resistance evaluation method according to the present invention, the wear material is supplied toward the buttocks of the subject, and the film is worn in the thickness direction so that the subject is exposed at the buttocks by colliding the wear material. Then, the abrasion of the film can be advanced so that the boundary between the subject and the film moves by colliding the wear material with the side of the film. Therefore, according to the above-described wear resistance evaluation method, it becomes possible to simulate the wear behavior at a portion where the wear of the film particularly easily progresses during actual use, such as the buttocks of a cutting tool, which is correlated with this. Abrasion resistance test can be performed. Further, not only the wear behavior in which the film decreases in the thickness direction, but also the wear behavior in which the exposed portion of the surface of the test object spreads in the surface direction can be evaluated. That is, the wear resistance can be evaluated in consideration of the wear behavior affected by the adhesion between the subject and the film. Therefore, it is possible to evaluate wear resistance that simulates the near wear behavior at the time of actual use of the cutting tool.

  In the above-described abrasion resistance evaluation method, the abrasion material may be a liquid in which hard powder is dispersed.

  In the rake face wear of the cutting tool, the work material sliding on the rake face moves substantially parallel to the rake face. Here, when the hard powder is sprayed as it is without being dispersed in the liquid, the hard powder is reflected on the surface of the subject, so it is difficult to move the hard powder in parallel to the surface of the subject. On the other hand, in the above-mentioned abrasion resistance evaluation method, the reflection of the hard powder on the surface of the test object is suppressed by supplying the wear material in which the hard powder is dispersed in the liquid, and the object surface is also subjected to the collision. The wear material can be moved parallel along. This makes it possible to reproduce the wear behavior of the coating close to the actual cutting tool in use. In addition, it is also possible to make the wear material collide more locally and uniformly than when the hard powder is directly jetted.

  In the above-described abrasion resistance evaluation method, in the post-evaluation step, the moving speed of the boundary portion may be measured by the time change of the width of the exposed portion on the surface of the subject.

  The width of the exposed portion formed on the surface of the subject due to the wear of the coating can be easily measured by a simple method such as image analysis. Therefore, by measuring the width of the exposed portion with time, it is possible to easily measure the moving speed of the boundary portion between the subject and the film.

  In the above-described abrasion resistance evaluation method, the step of evaluating the abrasion resistance may further include a pre-evaluation step of measuring a wear rate in a thickness direction of the hard film before exposure of the subject.

  Thus, the wear resistance is evaluated in consideration of not only the wear behavior in which the interface between the subject and the film moves after exposure of the subject, but also the wear behavior in which the film loses weight in the thickness direction before the subject is exposed. can do. Therefore, the wear resistance evaluation that simulates the wear behavior closer to the actual use of the cutting tool becomes possible.

  In the above-mentioned abrasion resistance evaluation method, the subject may be a cutting edge of a cutting tool. The ridge portion may be a cutting edge for cutting a work material at the cutting edge portion.

  As a result, the film can be worn away in the thickness direction so that the tool surface is exposed at the cutting edge due to the collision of the wear material, and then the film can be worn so that the interface between the tool and the film moves. Therefore, a wear resistance evaluation test that simulates the wear behavior during actual use of the cutting tool is possible.

  According to the present invention, it is possible to provide a wear resistance evaluation method that enables an evaluation test that simulates the wear behavior during actual use of a member in which wear of the coating particularly easily progresses in the buttocks.

It is a schematic diagram which shows the structure of the circulation type MSE tester used for the abrasion resistance evaluation method which concerns on this embodiment. It is a figure which shows a mode that the surface shape of a subject is measured with a stylus type two-dimensional roughness meter. It is a flowchart which shows the procedure of the said abrasion resistance evaluation method. It is a figure which shows the structure of the insert used by the said abrasion resistance evaluation method. It is a schematic diagram which shows the state installed in the state which the test subject inclined with respect to the injection direction of abrasion material. It is a schematic diagram which shows the abrasion behavior of the hard film by injection of a wear material. It is an optical micrograph which observed the subject surface after abrasion of a hard film. It is a photograph which shows the wear condition of the film in the cutting edge of an insert. It is a schematic diagram for demonstrating the abrasion behavior of the film | membrane in an insert. It is a graph which shows the time change of the wear width in an insert.

  Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

(Test equipment)
First, the configuration of a test apparatus 1 used in the method of evaluating wear resistance according to the present embodiment will be described with reference to FIG.

  The test device 1 is a micro slurry jet erosion (MSE) type device in which the wear material S in which hard powder is dispersed in liquid is accelerated by compressed air and sprayed toward the subject 10. The test apparatus 1 is a circulating MSE tester, and the table 2 on which the subject 10 is set, the nozzle 4 for jetting the wear material S toward the subject 10, and the wear material S to the subject 10 A mixer 8 for stirring the wear material S in the tank 8, and an air supply unit 5 for supplying compressed air to the nozzle 4.

  The table 2 is disposed in the upper space in the tank 8 and has an installation surface 2A on which the subject 10 is set. In FIG. 1, the surface of the subject 10 is in a posture to face the nozzle 4, but the installation surface 2A can be installed in a posture in which the buttocks of the subject 10 face to the nozzle 4 (injection port 4A). It is done.

  The mixer 7 is disposed at a lower portion in the tank 8. The mixer 7 stirs the wear material S stored in the lower space of the tank 8 after being jetted from the nozzle 4 to the subject 10. A suction hole 6 is formed in a portion of the mixer 7 above the propeller. Since the test device 1 is a circulation type device, the wear material S sucked up from the suction hole 6 can be supplied to the nozzle 4 again.

  The air supply unit 5 includes an air compressor 5A, an air pipe 5B connecting the air compressor 5A and the nozzle 4, and a regulator 5C provided in the middle of the air pipe 5B, a pressure sensor 5D and a solenoid valve 5E. ing. The compressed air generated by the air compressor 5A is supplied to the nozzle 4 through the air pipe 5B. The flow rate of the compressed air is adjusted by the regulator 5C, and the pressure is measured by the pressure sensor 5D. By opening and closing the solenoid valve 5E, the flow and blocking of the compressed air in the air pipe 5B can be switched. The solenoid valve 5E is provided with a timer 5F.

  The nozzle 4 jets the wear material S accelerated by the compressed air toward the subject 10 on the table 2. The nozzle 4 has an injection port 4A for injecting the wear material S. The nozzle 4 is installed on the upper side surface of the tank 8 with the injection port 4A oriented in the horizontal direction so that the wear material S can be jetted from the side surface (right side surface) of the tank 8 toward the table 2.

(Measuring instrument)
Next, a measuring device for performing various measurements on the subject 10 after the wear material S is injected will be described. This measuring instrument is not provided in the test apparatus 1 but is another apparatus.

  This measuring instrument covers an image acquisition means such as an optical microscope or an electron microscope, an image display means such as a display for displaying the acquired image, an image analysis means for analyzing the acquired image, and the subject 10 It has operation means for calculating the wear rate of the film, etc., and optical or stylus type shape measurement means.

  The tester can confirm on the image display means that the film covering the subject 10 disappears by the jet of the wear material S and the subject 10 is exposed. And based on the time until the subject 10 is exposed and the thickness of the film before the start of the test, the wear rate in the thickness direction of the film can be calculated by the calculating means. The examiner can also measure the width of the exposed portion of the subject 10 by image analysis means. Then, based on the time change of the width of the exposed portion, the wear rate in the surface direction of the film can be calculated by the calculation means.

  FIG. 2 shows how the surface shape of the subject 10 after the wear material S is injected is measured using a shape measurement means (two-dimensional roughness meter). The surface of the subject 10 is abraded by the jet of the abrading material S, whereby an erosion mark 10A is formed. As shown by the broken line 31 in FIG. 2, the cross-sectional shape can be measured by tracing the erosion mark 10A with a stylus type probe 30. By repeating such shape measurement and the ejection of the wear material S, the cross-sectional shape of the subject 10 can be observed over time.

(Abrasion resistance evaluation method)
Next, a method of evaluating wear resistance according to the present embodiment performed using the test apparatus 1 will be described along the flowchart shown in FIG.

  First, step S10 of preparing a subject is performed. In this step S10, an insert (cutting edge) of the cutting tool shown in FIG. 4 is prepared as the subject 10.

  This insert is used by attaching to the shank tip of the cutting tool. The subject 10 has a square shape in plan view and is made of a hard material such as cemented carbide. The subject 10 has a rake surface 11 which is a portion raised up into a work material (not shown) and a flank surface 12 which is a escaped portion to avoid contact with the work material. A portion where the rake face 11 is connected to the flank 12 is a cutting edge 13. The cutting edge 13 is a portion that cuts in contact with the work material, and is a ridge including a ridge line where the adjacent rake face 11 and flank face 12 intersect. At four corners of the subject 10, there are provided apexes 14 (ridges) where a rake face 11 and two flanks 12 adjacent to the rake face 11 meet. The surface of the subject 10 is covered with a hard film made of a metal ceramic material such as TiAlN. The hard film is formed on the subject 10 by a predetermined film forming method such as AIP (arc ion plating).

  Next, step S20 of installing a subject is performed. In this step S20, the subject 10 prepared in the above step S10 is set on the table 2 of the test apparatus 1 (FIG. 1). Here, as shown in FIG. 5, the subject 10 is installed on the installation surface 2A in a state of being inclined so as to form a predetermined inclination angle θ with respect to the ejection direction of the wear material S. As a result, the buttocks (cutting edges) 13 of the subject 10 face the supply side (i.e., the injection port 4A side) of the wear material S, and the wear material from the nozzle 4 toward the buttocks 13 in step S30 described later. S can be injected. The subject 10 can be installed in the inclined state by any means, and may be inclined using a jig, for example, or the table 2 itself may be inclined.

  It is preferable that the test object 10 be installed at an inclination angle θ of 45 ° so that the wear material S is sprayed evenly to both the rake face 11 and the flank face 12, but the rake face 11 and the flank face 12 When the wear material S is to be jetted intensively to any one of the surfaces, the inclination angle θ may be adjusted accordingly. Specifically, the inclination angle θ may be set to a value exceeding 45 ° in the case of intensive injection to the rake face 11, and the inclination angle in the case of intensive injection to the flank 12 θ may be set to a value less than 45 °.

  Next, step S30 of evaluating the abrasion resistance of the hard film is performed. In this step S30, as shown in FIG. 6, the wear material S in which the hard powder is dispersed in the liquid is sprayed toward the ridge portion 13 of the subject 10, and the wear when the wear material S collides with the hard film 20 The wear resistance of the hard film 20 is evaluated by the behavior.

  This step S30 includes a pre-evaluation step S31 performed before the exposure of the subject 10 and a post-evaluation step S32 performed after the exposure of the subject 10, as described below. The upper part of FIG. 6 shows the wear behavior of the hard film 20 when viewed from the direction perpendicular to the ejection direction of the wear material S, and the lower part of FIG. 6 shows the hardness when viewed from the injection direction of the wear material S. The wear behavior of the coating 20 is shown. FIG. 6 (A) shows the state before the subject 10 is exposed, FIG. 6 (B) shows the state when the subject 10 is exposed, and FIG. 6 (C) shows the subject 10 exposed. Shows the state after the

  The hard powder contained in the wear material S is made of hard particles such as alumina (corundum), SiC (alundum) or diamond particles. The particle size of the hard particles is about 0.5 to 100 μm, but can be appropriately selected according to the shape of the test object 10, the type of the hard film 20, and the film thickness. Further, the injection speed of the wear material S, the injection amount, and the distance between the flange portion 13 and the injection port 4A can be freely set, and can be appropriately selected similarly to the particle diameter of the hard particles.

  First, in the pre-evaluation step S31, as shown in FIG. 6A, the wear material S is jetted toward the ridge portion 13 of the subject 10, and the hard film 20 is collided with the hard powder in the wear material S. Wear in the thickness direction. In this step S31, before the hard film 20 disappears in the ridge portion 13 and the subject 10 is exposed, the wear rate of the hard film 20 in the thickness direction is measured.

  Specifically, after the wear material S is jetted for a predetermined time, the shape of the collar 13 is measured by a two-dimensional roughness meter as shown in FIG. 2 and compared with the shape of the collar 13 before the start of the test. Thus, the wear rate is measured. That is, the wear rate is calculated from the injection time of the wear material S and the amount of decrease in the film thickness of the hard film 20 in the meantime. Alternatively, the exposure rate of the subject 10 may be confirmed by the image display means, and the wear rate may be calculated based on the time until the subject 10 is exposed and the film thickness of the hard film 20 before the start of the test.

  Next, in the post evaluation step S32, after the hard film 20 disappears in the ridge portion 13 and the subject 10 is exposed (FIG. 6B), the wear material S is continuously jetted toward the ridge portion 13 . The hard film 20 includes a surface 20B along the rake surface 11 and the flank 12 and a side surface 20A intersecting the surface 20B. The wear material S flows away from the ridge portion 13 along the rake face 11 and the flank face 12 as shown in FIGS. 6 (B) and 6 (C). The hard powder in the wear material S collides with the side surface 20A of the hard film 20, whereby the boundary portions A1 and A2 of the test object 10 and the hard film 20 move in the direction away from the ridge 13 Wear progresses. That is, the abrasion of the hard film 20 progresses in each of the rake face 11 and the flank face 12 starting from the ridge portion 13. In this step S32, the moving speeds of the boundary portions A1 and A2 in the wear behavior are measured.

  Specifically, an image of the surface of the subject 10 is acquired by an optical microscope, and the acquired image is displayed on the display. Then, as shown in FIG. 7, boundary positions L1 and L2 indicating the boundary between the subject and the hard film are determined by image analysis. Here, since the position of the boundary portion varies in the extending direction of the collar portion 13, the boundary positions L1 and L2 may be determined as the average position. However, the determination of the boundary positions L1 and L2 is not limited to this, and various methods are possible, and may be determined based on only a specific position in the direction in which the ridge 13 extends, for example. The boundary positions L1 and L2 are measured over time, and with the time change, the speed at which the boundary portions A1 and A2 move in the direction away from the heel 13 (arrow in the lower part of FIG. 6C) is measured.

  In the image of the surface of the subject 10 displayed on the display, the width W of the exposed portion B may be measured as the wear width by image analysis, and the moving speed of the boundary portions A1 and A2 may be measured by the time change. . As shown in the lower part of FIG. 6C, the width W is a boundary portion A1 between the test object 10 and the hard film 20 on the rake face 11 and a boundary portion A2 between the test object 10 and the hard film 20 on the flank 12 Distance between The wear resistance evaluation method according to the present embodiment is completed by performing the above steps S10 to S30 in order.

(Action effect)
Next, features of the method of evaluating wear resistance according to the present embodiment and the effects and advantages thereof will be described.

  The abrasion resistance evaluation method according to the present embodiment includes step S10 of preparing the test subject 10 having the heel portion 13 and step S20 of installing the subject 10 so that the heel portion 13 faces the supply side of the wear material S. And step S30 for evaluating the wear resistance of the hard film 20 based on the wear behavior when the wear material S supplied toward the ridge portion 13 collides.

  FIG. 8 shows the cutting edge (insert) 100 of the cutting tool provided with the rake face 110 and the flank face 120, and FIG. 9 shows the insert 100 viewed in cross section at the arrow portion in FIG. As shown in FIGS. 9A and 9B, after the hard film 200 disappears and the tool surface is exposed, the wear on the rake surface 110 of the cutting tool is hard as shown in FIGS. 9A and 9B. It advances by moving gradually in the direction (arrow direction in the figure) which separates boundary part A1 with film 200 from ridge part 130. Thereby, as shown to FIG. 9 (A) and (B), the exposed part of the insert 100 is expanded in the rake surface 110, and the abrasion width W becomes large gradually. As described above, the wear during actual use of the cutting tool exhibits a complicated behavior that is affected not only by the behavior of decreasing in the thickness direction but also by the adhesion between the insert and the film after the insert is exposed.

  On the other hand, in the wear resistance evaluation method according to the present embodiment, as shown in FIG. 6, the wear material S is jetted toward the ridge 13 of the subject 10 and the hard powder in the wear material S collides. The hard film 20 is abraded in the thickness direction so that the subject 10 is exposed in the ridge portion 13 by causing the hard powder 20 to collide with the side surface 20A of the hard film 20 and then the subject 10 and the hard film 20 The wear of the hard film 20 can be advanced so that the boundary portions A1 and A2 of the Therefore, according to the above-described wear resistance evaluation method, it is possible to simulate the wear behavior during actual use of the cutting tool, and it is possible to conduct a wear resistance test correlating with this.

  In the above-described abrasion resistance evaluation method, a liquid in which hard powder is dispersed is used as the abrasion material S. Thereby, the reflection of the hard powder on the surface of the test object 10 is suppressed, and it becomes possible to move the hard powder along the surface of the test object 10 substantially in parallel. It can be reproduced. Moreover, compared with the case where the hard powder is projected as it is, the hard powder can be made to collide more locally and uniformly.

  The step S30 of evaluating the abrasion resistance includes a post evaluation step S32 of measuring the moving speed of the boundary portions A1 and A2 between the subject 10 and the hard film 20 after the exposure of the subject 10. By this step S32, not only the wear behavior in which the hard film 20 decreases in the thickness direction, but also the wear behavior in which the exposed portion B of the surface of the test object 10 spreads in the surface direction can be evaluated. Therefore, the wear resistance can be evaluated in consideration of the wear behavior affected by the adhesion between the test object 10 and the hard film 20. The moving speeds of the boundary portions A1 and A2 may be measured based on the time change of the width W of the exposed portion B on the surface of the subject 10.

  The step S30 of evaluating the abrasion resistance includes a pre-evaluation step S31 of measuring the wear rate in the thickness direction of the hard film 20 before the exposure of the subject 10. By this step S31, not only the wear behavior that the boundary portions A1 and A2 of the test subject 10 and the hard film 20 move after the exposure of the surface of the test subject 10, but also the hard coating 20 in the thickness direction before the exposure of the test subject 10 surface The wear resistance can also be evaluated in consideration of the wear behavior which reduces to. Therefore, the wear behavior closer to the actual use state of the cutting tool can be simulated.

(Other embodiments)
In the above embodiment, the present invention is not limited to the case where the wear material S is jetted toward the cutting edge 13 of the subject 10 to evaluate the wear resistance of the hard film 20, and the wear material S is jetted toward the apex 14 It is also good.

  In the said embodiment, it is not restricted to the case where the abrasion material S which the hard powder disperse | distributed to the liquid is injected, a hard powder may be projected independently. However, from the viewpoint of suppressing the reflection on the surface of the subject 10 as described above, it is preferable that the ink be dispersed in the liquid as in the above embodiment.

  In the above embodiment, the test object 10 is not limited to the insert of the cutting tool, and is a member such as a tool component such as a shearing tool or a mechanical component such as a turbine blade, which is a member that easily wears the coating on the edge of the object. It may be Then, by supplying the wear material toward the buttocks of these members, a wear resistance evaluation test simulating the wear behavior at the time of actual use becomes possible as in the above embodiment.

(Example)
The following experiment was performed using the test apparatus 1 which is a circulating MSE test apparatus shown in FIG.

  First, a cemented carbide insert coated with a TiAlN film (thickness: about 10 μm) was prepared as a subject. The TiAlN film was formed by the AIP method. Next, the insert was set on the table 2 with the ridge portion (cutting edge) directed to the injection port 4A side, and the wear material S was injected toward the ridge portion. The test conditions were as follows.

<Test conditions>
Particle size: # 2000 (average particle size: 6.9 μm)
Particle concentration in wear material S: 3% by mass
Projection distance: 10 mm
Projection angle: 45 °
The surface of the insert after spraying the wear material S was observed with an optical microscope, and the width W of the exposed portion of the surface of the insert was measured over time from the photograph.

  FIG. 7 is an optical micrograph of the surface of the insert as viewed from the jetting direction of the wear material S, showing the wear width W formed by the jetting of the wear material S. As shown in FIG. The graph of FIG. 10 is a graph showing the time change of the wear width W on the insert surface.

  As shown in the graph of FIG. 10, the wear width W is zero from time T0 to time T1 when the test is started, and the wear width W increases substantially linearly after time T1 has elapsed. Therefore, by dividing the film thickness of the TiAlN film before the start of the test by the time T0 to T1 until the insert is exposed, it is possible to calculate the wear rate in the thickness direction of the TiAlN film before the insert is exposed. In addition, the slope at which the wear width W increases after the elapse of time T1, the increase speed of the wear width W is obtained, and the moving speed of the boundary portion between the insert and the TiAlN film is obtained. In this way, it was possible to carry out the wear resistance evaluation simulating the wear behavior on the rake face of an actual cutting tool.

  It should be understood that the embodiments and examples disclosed this time are illustrative in all respects and not restrictive. The scope of the present invention is shown not by the above description but by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims.

  1 test apparatus, 2 table, 2A installation surface, 4 nozzle, 4A injection port, 5 air supply unit, 5A air compressor, 5B air piping, 5C regulator, 5D pressure sensor, 5E solenoid valve, 5F timer, 6 suction port, 7 Mixer, 8 tanks, 10 subjects, 10A erosion marks, 11 scoops, 12 flanks, 13 cutting edges (heads), 14 apexes (heads), 20 hard film, 20A side, 20B surface, 30 probes

Claims (4)

A wear resistance evaluation method for evaluating the wear resistance of a hard coating according to the wear behavior when a wear material is caused to collide with a hard coating covering a test object,
Preparing a subject having a buttock coated with a hard coating and having a plurality of adjacent faces meet;
Placing the subject such that the buttocks face the supply side of the wear material;
Evaluating the wear resistance of the hard coating according to the wear behavior when the wear material supplied toward the buttocks collides.
The method of evaluating abrasion resistance, the step of evaluating the abrasion resistance includes a post evaluation step of measuring a moving speed of a boundary between the object and the hard coating after the exposure of the object. The wear resistance evaluation method according to claim 1 , wherein in the post evaluation step, the moving speed of the boundary portion is measured by time change of the width of the exposed portion on the surface of the subject. The method of evaluating wear resistance according to claim 1 or 2 , wherein the step of evaluating wear resistance further includes a pre-evaluation step of measuring a wear rate in a thickness direction of the hard film before exposure of the subject. . The subject is a cutting edge of a cutting tool,
The wear resistance evaluation method according to any one of claims 1 to 3 , wherein the ridge portion is a cutting edge for cutting a work material at the cutting edge portion.

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