JP2005083924A - Apparatus for evaluating adhesive force in flame spraying coating - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an adhesive force evaluating apparatus of flame spraying coating for precisely and rapidly evaluating the adhesive force between a body material and flame spraying coating. <P>SOLUTION: The adhesive force evaluating apparatus 20 of the flame spraying coating 13 comprises: two probes 31, 32 that are arranged with an interval L along one direction and scratch the surface of the flame spraying coating; an application means 33 for applying a load when scratching the tip of the two probes; a moving means 50 for moving the two probes in the other direction for orthogonally crossing one direction so that the surface of the flame spraying coating is scratched; a detection means 35 for detecting the amount of rising of the flame spraying coating positioned between the two probes; and a control means 100 for controlling the operation of the moving means. The control means operates the moving means for moving the two probes so that they scratch the surface of the flame spraying coating, and evaluates the adhesive force between the body material 21 and the flame spraying coating, based on the amount of rising of the flame spraying coating detected by the detection means. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a thermal spray coating adhesion evaluation apparatus for evaluating the adhesion between a base material and a thermal spray coating formed on the surface of the base material.

  As a method for evaluating the adhesion of a film, a thin film or a coating film, there are known (1) a tensile test, (2) a scratch test, or (3) a repeated scratch test (patent) (See Literature 1, Patent Literature 2, and Patent Literature 3). For example, each method will be described by taking as an example the case of evaluating the adhesion of a sprayed coating formed on the surface of a base material of a cylinder block.

(1) Tensile test method In the tensile test method, a test piece in which a sprayed coating is formed on the surface of an arc-shaped base material or a sample cut out from a cylinder block as a product is used. A tensile test piece is manufactured by bonding a tensile test jig with an adhesive on the surface of the sprayed coating and the back surface of the base material of the test piece or sample. As the adhesive, an adhesive having an adhesive force stronger than the adhesive force between the base material and the sprayed coating surface is used. Then, a tensile load is applied to the sprayed coating, and the tensile load at the time of fracture is evaluated as the adhesion force.

  However, when the test piece is used, when the test piece is manufactured, the uneven surface shape of the sprayed surface, that is, the surface of the base material, the material of the base material, and how to make the base material (the base material of the cylinder block is a cast product). ) Etc. must be equivalent to the actual state of the parts. When using a sample, the manufactured cylinder block must be destroyed, the sample taken out from the cylinder bore surface on which thermal spraying is applied, and processed into a predetermined size and shape. For this reason, it takes time to produce test pieces and samples.

  In addition, since it is necessary to produce an integrated tensile test piece by bonding the test piece or sample and the tensile test jig, in order to measure the adhesion of the sprayed coating, It takes about 3 days for a series of operations such as production of a tensile test piece accompanied by adhesive work and curing of the adhesive, attachment of the tensile test piece to a tensile tester, and execution of a tensile test. Thus, since it takes too much time for evaluation, it cannot be applied to the line sampling inspection at the time of mass production of parts. Therefore, there is a problem that feedback of evaluation results to the production line cannot be performed in a timely manner.

  Furthermore, since the adhesion force is evaluated using the tensile load as a substitute property when the thermal spray coating interface breaks by performing a tensile test, there are microcracks in the base material and the adhesive layer, for example, other than the thermal spray coating interface. If there is, tensile stress concentrates on the part, and as a result, the fracture may start first from a place other than the sprayed coating interface. This makes it impossible to accurately evaluate the fracture strength of the thermal sprayed coating, and the test pieces, samples, and tensile test pieces that have been manufactured over a long time are wasted. There is a problem that it must be fixed.

(2) Scratch test method In the scratch test method, the surface of the sprayed coating is scratched with a sharp contact, and the frictional resistance between the sprayed coating and the contact is measured. Then, a large variation in the frictional resistance generated when the thermal spray coating is peeled off is captured, and the adhesion force is evaluated using the load applied to the tip of the contact at that time as a substitute characteristic. Hereinafter, the load applied to the tip of the contact is also referred to as tip load.

  However, the thermal spray coating is formed by melting the powder of the material at a high temperature and spraying the molten droplets on the base material at a high speed and stacking them, so the inside of the thermal spray coating has a structure containing innumerable microscopic voids. have. For this reason, it has a structure in which innumerable minute holes are opened on the surface of the sprayed coating after the surface is ground. Here, the scratch test method is a method of scratching the sprayed coating surface with a contact. For this reason, there is a possibility that the catching resistance when the contact falls into the innumerable minute holes on the surface of the sprayed coating and is caught as fluctuation of the frictional resistance. Therefore, whether the measured variation in frictional resistance is caused by the thermal spray coating being peeled off or caused by the contact falling into the micropores. As a result, there is a problem that the starting point of the thermal spray coating peeling cannot be identified.

  In general, the thickness of the coating evaluated by the scratch test method is 10 μm or less, but the thickness of the sprayed coating applied to the bore inner surface of the cylinder block is as thick as about 100 μm. The scratch test method is a technique in which a frictional resistance is generated between the contact and the film by the load at the tip of the contact, and the film is worn and peeled by the force. For this reason, it is necessary to apply a considerable tip load to the contact in order to generate a shear stress sufficient to peel off the coating at the coating interface existing about 100 μm below the surface. Therefore, in order to evaluate the adhesion of a relatively thick film, measures to prevent damage to the tip of the contactor are taken and the rigidity of the entire device is increased compared to a device that evaluates the adhesion of a relatively thin film. There is a problem that it is very difficult and expensive to manufacture the evaluation apparatus.

(3) Repeated scratch test method In the repeated scratch test method, the thermal spray coating surface is repeatedly scratched (for example, 1000 times) while the tip load of the sharp contactor is periodically and continuously varied from 0 to a predetermined load. The coating is shaved and thinned, and in the process of shaving, the thermal spray coating is peeled off and removed from the base material. When the sprayed coating falls off from the base material, the coating adhesion is evaluated using the number of repeated scratches at that time and the tip load of the contact at that time as substitute characteristics. The repeated scratch test is performed while constantly observing that the thermal spray coating has been peeled off from the base material. In order to confirm that the thermal spray coating has been peeled off or removed from the base material, a magnifying glass or a CCD camera is disposed in the vicinity of the tip of the contact.

However, since the color of the thermal spray coating is the same as the color of the base material, it is very difficult to determine the starting point of peeling / dropping of the thermal spray coating by visual observation. For this reason, evaluation has to rely on human subjectivity, and there exists a problem that the dispersion | variation in an evaluation result is large. Although it is conceivable to arrange a displacement sensor to measure the amount of wear on the thermal spray coating, it may have been caused by the thermal spray coating peeling or dropping, or it may be scraped without peeling or dropping. It is impossible to distinguish whether the displacement is caused by the fact. In addition, since this is a repetitive experiment, there is a problem that it takes a relatively long time to confirm peeling / dropping. Furthermore, in order to observe the peeling / dropping of the thermal spray coating applied to the bore inner surface of the cylinder block, it is necessary to reduce the size of the magnifying glass and the CCD camera, and it is very difficult and expensive to produce an evaluation device. There is a problem of becoming something.
JP-A-5-142128 JP 2000-74819 A JP 2001-91445 A

  The present invention has been made in view of the problems associated with the prior art described above, and provides a thermal spray coating adhesion evaluation apparatus capable of accurately and quickly evaluating the adhesion between a base material and a thermal spray coating. The purpose is to do.

In order to achieve the above object, the invention according to claim 1 is an apparatus for evaluating the adhesion between a base material and a thermal spray coating formed on the surface of the base material.
Two contacts arranged at intervals along one direction and scratching the surface of the sprayed coating;
Applying means for applying a load when scratching the tips of the two contacts;
Moving means for moving the two contacts in another direction orthogonal to the one direction so as to scratch the surface of the thermal spray coating;
Detecting means for detecting a floating amount of the thermal spray coating positioned between the two contacts in a direction perpendicular to the one direction and the other direction;
Control means for controlling the operation of the moving means and evaluating the adhesion between the base material and the thermal spray coating,
The control means actuates the moving means to move the two contacts applied with a load at the tip by the applying means in the other direction so as to scratch the surface of the sprayed coating, and the detecting means The adhesion force of the thermal spray coating is characterized by evaluating the adhesion force between the base material and the thermal spray coating on the basis of the lift amount of the thermal spray coating positioned between the two contacts detected by Evaluation device.

According to the present invention, the thermal spray coating can be reliably peeled off from the interface between the thermal spray coating and the base material, and the adhesion force between the base material and the thermal spray coating can be accurately and quickly evaluated. .
There is an effect.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic configuration diagram showing a thermal spray coating adhesion evaluation apparatus 20 according to an embodiment of the present invention, FIG. 2A is a bottom view showing details of the sensor unit 30 shown in FIG. (B) is sectional drawing which follows the 2B-2B line | wire of the same figure (A). For convenience of explanation, the horizontal direction in FIG. 1 is defined as the X direction, the direction orthogonal to the paper surface is defined as the Y direction, and the vertical direction is defined as the Z direction.

  Referring to FIGS. 1 and 2A and 2B, thermal spray coating adhesion evaluation apparatus 20 evaluates the adhesion between base material 12 and thermal spray coating 13 formed on base material surface 12a. In general, the device 20 is composed of two contactors 31 and 32 that are disposed at a distance L along the Y direction (corresponding to one direction) and scratch the surface of the sprayed coating 13. An application means 33 for applying a load when scratching the tips of the two contacts 31 and 32, and a Z direction perpendicular to the Y direction so as to scratch the surface of the sprayed coating 13 An X direction (one direction) perpendicular to the Y direction and the Z direction of the spraying coating 13 positioned between the moving means 50 (corresponding to another direction) and the two contacts 31 and 32 To the direction perpendicular to other directions) A detecting means 35 for detecting the amount, it has a control unit 100 for evaluating the adhesion between the base material 12 and the thermal spray coating 13 to control the operation of the moving means 50. Then, the control unit 100 operates the moving unit 50 to move the two contactors 31 and 32 applied with a load at the tip by the applying unit 33 in the Z direction so as to scratch the surface of the sprayed coating 13. The adhesion force between the base material 12 and the thermal spray coating 13 is evaluated based on the lift amount of the thermal spray coating 13 positioned between the two contacts 31 and 32 detected by the detection means 35. The two contacts 31, 32, the applying means 33 and the detecting means 35 constitute a sensor unit 30.

  In the present embodiment, the adhesion evaluation device 20 further includes the amount of lifting of the thermal spray coating 13 positioned between the two contacts 31 and 32 and the adhesion between the base material 12 and the thermal spray coating 13. It further has a storage means 110 in which the relationship with the value of is previously recorded. Then, the control means 100 estimates the value of the adhesion force between the base material 12 and the thermal spray coating 13 based on the detected lifting amount and the relationship recorded in the storage means 110.

  In the illustrated example, the thermal spray coating 13 to be evaluated is a thermal spray coating 13 formed on the inner surface 12 a of the cylinder block 10 while being applied to the inner surface of the bore 11.

  Hereinafter, the adhesion evaluation apparatus 20 for the thermal spray coating 13 will be described in detail.

  The two contacts 31, 32 are formed with sharp tips at their tips. The distance L between the two contacts 31 and 32 is preferably 1 mm to 2 mm. Furthermore, as each of the two contactors 31 and 32 bites into the thermal spray coating 13, a force in a direction in which the thermal spray coating 13 positioned between the two contacts 31 and 32 contracts is applied to the thermal spray coating 13. It has action surfaces 31a and 32a to be added. The working surfaces 31a and 32a face each other. Each contact 31, 32 is held by a casing 40 constituting the main body of the sensor unit 30 so as to be slidable in the X direction. The casing 40 is formed with guide holes 41 for holding the respective contacts 31 and 32. The tips of the contacts 31, 32 protrude to the outside of the casing 40, and the base ends face the storage chamber 42 formed inside the casing 40.

  The application means 33 includes, for example, a compression coil spring 34 that urges the contactors 31 and 32 with a spring force in a direction in which the contactors 31 and 32 protrude outside the casing 40. The compression coil spring 34 is disposed in the storage chamber 42, and one end thereof is in contact with the base ends of the contacts 31 and 32. The other end of the compression coil spring 34 is in contact with a load cell 37 for load measurement.

  The moving means 50 includes a slider 51 movable in the X and Y directions, a slider 52 movable in the Z direction, a motor (not shown) for driving the slider 51 in the X direction, and a slider 51 for driving the slider 51 in the Y direction. (Not shown), a motor (not shown) for driving the slider 52 in the Z direction, and the like. The sensor unit 30 is connected to the slider 52 via a rod 53. When the slider is moved in the Z direction with the tips of the contacts 31 and 32 being in contact with the thermal spray coating 13, the two contacts 31 and 32 in the sensor unit 30 are moved in the Z direction and the surface of the thermal spray coating 13 is moved. Scratch. By changing the distance between the thermal spray coating 13 and the sensor unit 30, the compression amount of the compression coil spring 34 is changed, so that the contact load of the contacts 31 and 32 can be changed. In order to detect the tip positions of the contacts 31 and 32, position detecting means, for example, an encoder or the like is provided in each motor.

  The detection means 35 includes a surface shape measuring sensor 36, and the sensor 36 is attached to the lower surface of the casing 40 so as to be positioned between the two contacts 31 and 32. The sensor 36 detects the amount of lifting in the X direction of the thermal spray coating 13 located between the two contacts 31 and 32 by measuring the distance to the surface of the thermal spray coating 13.

  As shown in FIG. 1, the load cell 37 is connected to the main controller 101, and the measured load data is input to the main controller 101. The sensor 36 is connected to the data link controller 102 via the amplifier 104, and the measured surface shape data is amplified by the amplifier 104 and input to the data link controller 102 as uneven shape data. An encoder provided in a motor included in the moving means 50 is also connected to the data link controller 102, and the output of the encoder is input to the data link controller 102 as position data (X, Y, Z) at the tips of the contacts 31, 32. Is done. A sensor traverse controller 103 for controlling the operation of the motor included in the moving means 50 and moving the sensor unit 30 is connected to the moving means 50. The data link controller 102 collects the uneven shape data and the position data in synchronization with a predetermined sampling period. The collected data is input to the main controller 101.

  The main controller 101 sets the measurement conditions (contact load, moving speed, etc. of the contacts 31 and 32), processes the input uneven shape data, and sprays between the two contacts 31 and 32. The amount of lift of the coating 13 is calculated, or the quality of the adhesion between the base material 12 and the thermal spray coating 13 is determined based on the calculated amount of lift. The main controller 101 further outputs a control signal to the sensor traverse controller 103. The control signal includes a signal for moving the sensor unit 30 according to the set measurement conditions, a signal for centering the surface shape measurement sensor 36, or a contact load of the contacts 31 and 32. A signal for finely adjusting the sensor unit 30 in order to make adjustment or change is included.

  The main controller 101 is further connected with a memory 111 corresponding to the storage unit 110. As described above, the memory 111 records the relationship between the amount of lifting of the thermal spray coating 13 and the value of the adhesion force. In addition, the memory 111 also stores a program for controlling the operation of the entire apparatus 20. Then, the main controller 101 estimates the value of the adhesion force between the base material 12 and the thermal spray coating 13 based on the detected lift amount and the relationship recorded in the memory 111.

  The main controller 101, the data link controller 102, and the sensor traverse controller 103 constitute a control unit 100.

  FIGS. 3A to 3C are views showing a state in which the thermal spray coating 13 can be peeled off from the interface between the thermal spray coating 13 and the base material 12, and FIG. 4 is a diagram between the two contacts 31 and 32. It is a figure with which it uses for description of the mechanism in which the thermal spray coating 13 located in FIG.

  As shown in FIG. 3A, the surface of the thermal spray coating 13 is scratched by the two contacts 31 and 32. The direction of the scratch is perpendicular to the paper surface of FIG. As shown in FIG. 3B, in the case of a high adhesion product having a relatively high adhesion at the interface between the thermal spray coating 13 and the base material 12, peeling at the interface between the thermal spray coating 13 and the base material 12 occurs. No or very little, if any. On the other hand, as shown in FIG. 3C, in the case of a low adhesion product having a relatively low adhesion at the interface between the thermal spray coating 13 and the base material 12, the interface between the thermal spray coating 13 and the base material 12 is used. Peeling occurs, and the thermal spray coating 13 positioned between the two contacts 31 and 32 floats from the base material surface 12a. In FIGS. 3B and 3C, the white arrow 60 indicates the scratch scratch position.

  The mechanism by which the thermal spray coating 13 located between the two contacts 31 and 32 floats will be described with reference to FIG. (1) First, the sprayed coating 13 is restrained by receiving a downward load in the figure at the points Pa and Pb where the contacts 31 and 32 hit the sprayed coating 13 by the tip loads Fa and Fb of the contacts 31 and 32. (2) As the contacts 31 and 32 bite in, the tapered or inclined working surfaces 31a and 32a at the tips of the contacts 31 and 32 apply a force Fc in a direction to shrink the sprayed coating 13 to the inner side. . (3) When the force Fc acting toward the inside of the thermal spray coating 13 is larger than the interface adhesion force (shear stress) between the thermal spray coating 13 and the base material 12, the thermal spray coating 13 is peeled off. (4) The thermal spray coating 13 that has peeled off is lifted upward by the action of the force Fc in the direction of shrinking inward.

  FIG. 5A is a diagram for explaining the definition of the lift amount of the thermal spray coating 13, and FIG. 5B is a graph showing the lift amount of the thermal spray coating 13 between the test piece having a high adhesion force and the test piece having a low adhesion strength. It is a graph which shows an example.

  As shown in FIG. 5 (A), the floating amount of the sprayed coating 13 is defined as the difference between the center height of the sprayed coating 13 after scratching and the average height of the surface of the sprayed coating 13 before scratching. When the distance L ′ between the two scratch scratches 61 is narrow, the central portion is lifted. As shown in FIG. 5 (B), in the test piece with high adhesion, the amount of lifting of the thermal spray coating 13 is, for example, about 40 μm. In the test piece with low adhesion, the amount of lifting of the thermal spray coating 13 is, for example, , About 70 μm.

  FIG. 6A is a calibration curve showing the relationship between the amount of lift of the thermal spray coating 13 positioned between the two contacts 31 and 32 and the value of the adhesion force between the base material 12 and the thermal spray coating 13. FIG. 6B is a flowchart showing an example of the created calibration curve 70. FIG.

  As shown in FIG. 6 (A), the calibration curve 70 is first prepared by using a test piece in which the thermal spray coating 13 is formed on the base material 12 by a conventional tensile test method to determine the adhesion of the thermal spray coating 13. Measure in advance (step S11). As the measurement data, only data that can confirm that the thermal spray coating 13 has been peeled off at the adhesion interface with the base material 12 is employed.

  Next, the thermal spray coating 13 manufactured under the same conditions as in the case of the test piece is scratch-tested with the two contacts 31 and 32, and the lift amount of the thermal spray coating 13 positioned between the two contacts 31 and 32 is determined. Measurement is performed by the sensor 36 (step S12). Note that the load applied to the contacts 31 and 32 is also measured by the load cell 37.

  Then, a calibration curve 70 is created based on the adhesion obtained in step S11 and the lifting amount obtained in step S12 (step S13). The created calibration curve 70 is also related to the contact load of the contacts 31 and 32. Therefore, it is preferable to perform a scratch test in which loads applied to the contacts 31 and 32 are different, and prepare a calibration curve 70 under a plurality of contact loads. An example of the created calibration curve 70 is shown in FIG. 6B, and the amount of lifting becomes smaller in proportion to the increase in adhesion.

  Next, the operation will be described.

  FIG. 7 is a flowchart showing a procedure for evaluating the adhesion of the thermal spray coating 13.

  The main controller 101 outputs a control signal for operating the moving means 50 to the sensor traverse controller 103 based on the measurement conditions such as the contact load of the contacts 31 and 32. The sensor unit 30 moves to the initial position corresponding to the measurement conditions (step S21).

  The main controller 101 operates the moving means 50 to move the sensor unit 30 in the Z direction so that the two contacts 31 and 32 to which the tip load is applied by the compression coil spring 34 scratch the surface of the sprayed coating 13. . When the contacts 31 and 32 are scratching the thermal spray coating 13, the amount of lift of the thermal spray coating 13 positioned between the two contacts 31 and 32 is measured by the surface shape measuring sensor 36 (step). S22).

  The main controller 101 refers to the calibration curve 70 recorded in the memory 111, and estimates the value of the adhesion force between the base material 12 and the thermal spray coating 13 from the measured lifting amount (step S23).

  Then, the main controller 101 compares the preset adhesion force threshold value with the estimated adhesion force value (step S24), and if the estimated adhesion force value is greater than or equal to the threshold value (step S24). S24, “Yes”), the adhesion between the base material 12 and the thermal spray coating 13 is evaluated as “good”. On the other hand, if the estimated value of the adhesion force is smaller than the threshold value (step S24, “No”), the main controller 101 determines that the adhesion force between the base material 12 and the thermal spray coating 13 is “No”. evaluate.

  The adhesion strength evaluation apparatus 20 for the thermal spray coating 13 in this embodiment belongs to the scratch test method in which the surface of the thermal spray coating 13 is scratched by the sharp contacts 31 and 32 in terms of mechanism. The thermal spray coating 13 positioned therebetween is used to lift up in a direction (X direction) perpendicular to the scratching direction (Z direction). For this reason, the thermal spray coating 13 can be reliably peeled off from the interface between the thermal spray coating 13 and the base material 12. Since the thermal spray coating 13 can be peeled off at the adhesion interface with the base material 12, the tip loads of the contacts 31, 32 when the thermal spray coating 13 is scratched and the two contacts 31 set by the method of the present embodiment. , 32 and the amount of lift of the sprayed coating 13 positioned between the two contacts 31, 32 can be correlated one-to-one with the interfacial adhesion force of the sprayed coating 13. Therefore, compared with a general scratch test method for measuring the frictional resistance between the thermal spray coating and the contact, the interfacial adhesion force of the thermal spray coating 13 can be accurately evaluated.

  Further, since the value of the adhesion force between the base material 12 and the thermal spray coating 13 is estimated based on the detected lifting amount and the calibration curve 70 created and recorded in advance, it is directly and easily reduced. Adhesion can be evaluated with time. For this reason, it is possible to easily increase the frequency of line sampling inspection during mass production of parts. Therefore, the quality determination result regarding the adhesion of the thermal spray coating 13 can be fed back to the production line of the thermal spray coating 13 in a timely manner, and by controlling the processing conditions of the thermal spray coating 13 in a timely manner, the thermal spray coating 13 of good quality can be obtained. It can be obtained stably.

  When evaluating the adhesion of the thermal spray coating 13 during mass production of parts, it is not necessary to manufacture a tensile test piece by bonding a test piece or sample and a tensile test jig each time. The time required for such as can be greatly reduced.

  Next, the result of considering the relationship between the distance L between the two contacts 31 and 32 and the amount of lifting of the thermal spray coating 13 will be described.

  FIG. 8 (A) is a diagram showing a floating state of the thermal spray coating 13 in an example in which the adhesion of the iron-based thermal spray coating 13 formed on the aluminum base material 12 is evaluated, and FIG. It is a figure which shows the relationship between the space | interval L between the contacts 31 and 32, and the amount of lifting of the thermal spray coating. FIG. 9A is a diagram showing the influence of the interval L between the two contacts 31 and 32 on the correlation function R, and FIG. 9B is a diagram between the two contacts 31 and 32. It is a figure which shows the influence which the space | interval L of affects on dispersion | variation (sigma). Note that, as defined in FIG. 8A, the center lift is the lift of the thermal spray coating 13 at the center of the two scratch scratches 61, and the lift MAX is the highest lift of the spray coating 13. The amount of lift at the site.

  As is apparent from FIG. 8B, when the distance L between the two contactors 31 and 32 is 2.5 mm or more, the adhesive strength at the interface between the thermal spray coating 13 and the base material 12 is high or low. The amount of lift at the center of the sprayed coating 13 was zero. Therefore, the adhesion cannot be evaluated.

  When the distance L between the two contactors 31 and 32 was set between 1 mm and 2 mm, the amount of lift varied depending on the level of adhesion at the interface between the thermal spray coating 13 and the base material 12. Therefore, it becomes possible to evaluate the adhesion by correlating the amount of lifting at the center with the adhesion of the thermal spray coating 13.

  If the distance L between the two contacts 31 and 32 is set to be less than 1 mm, irregular deformation or destruction such as buckling of the sprayed coating 13 that has been lifted or lifted occurs as shown in FIG. Thus, the correlation between the amount of lifting at the center and the adhesion of the thermal spray coating 13 can no longer be obtained.

  The experiment was carried out by swinging the distance L between the two contacts 31 and 32 from 0.8 mm to 1.5 mm with respect to the aluminum base material-iron-based thermal spray coating part (adhesion strength around 30 MPa). As a result of analyzing the correlation between the amount of lifting at the center and the adhesion of the thermal spray coating 13, it was found that the correlation was the largest when set to about 1.2 mm (FIG. 9A) and the variation σ was also small. (FIG. 9B).

  Therefore, the adhesion L of the thermal spray coating 13 can be accurately estimated by selecting the distance L between the two contacts 31 and 32 according to the adhesion measurement range of the thermal spray coating 13 between 1 mm and 2 mm. It becomes possible to do. In the case of an aluminum base material-iron-based thermal spray coating part (adhesion strength around 30 MPa), when the distance L between the two contacts 31 and 32 is about 1.2 mm, the viewpoint of the correlation function R and variation σ It was optimal from.

  As described above, in this embodiment, in the apparatus 20 for evaluating the adhesion between the base material 12 and the thermal spray coating 13 formed on the base material surface 12a, the interval L is set along one direction. Two contactors 31 and 32 that are arranged apart from each other and scratch the surface of the thermal spray coating 13, an application means 33 that applies a scratching force to the tips of the two contactors 31 and 32, and the surface of the thermal spray coating 13 The moving means 50 for moving the two contacts 31 and 32 in another direction orthogonal to one direction so as to scratch the thermal spray coating 13 and the thermal spray coating 13 positioned between the two contacts 31 and 32, The detecting means 35 for detecting the amount of lifting in the direction orthogonal to one direction and the other direction, and the operation of the moving means 50 are controlled, and the adhesion force between the base material 12 and the thermal spray coating 13 is evaluated. Control means 100. The means 100 operates the moving means 50 to move the two contacts 31 and 32 applied with a load at the tip by the applying means 33 in the other direction so as to scratch the surface of the sprayed coating 13. Since the adhesion force between the base material 12 and the thermal spray coating 13 is evaluated based on the floating amount of the thermal spray coating 13 positioned between the two contactors 31 and 32 detected by 35, the thermal spray coating 13 and the mother The thermal spray coating 13 is reliably peeled off from the interface with the material 12, and the adhesion force between the base material 12 and the thermal spray coating 13 can be evaluated accurately and quickly.

  Further, a memory in which the relationship (calibration curve 70) between the amount of lifting of the thermal spray coating 13 positioned between the two contacts 31 and 32 and the value of the adhesion force between the base material 12 and the thermal spray coating 13 is recorded. The control unit 100 further includes a unit 110, and the control unit 100 estimates the value of the adhesion force between the base material 12 and the thermal spray coating 13 based on the detected lift amount and the relationship recorded in the storage unit 110. The adhesion strength can be evaluated directly and easily in a short time, and the quality determination result regarding the adhesion strength of the thermal spray coating 13 can be fed back to the production line of the thermal spray coating 13 in a timely manner during the mass production of parts. A quality sprayed coating 13 can be obtained stably.

  Moreover, since the space | interval L between the two contactors 31 and 32 is 1 mm-2 mm, the amount of lift of the sprayed coating 13 and the contact | adhesion power of the sprayed coating 13 are correlated, and adhesive force is evaluated suitably. be able to.

  Further, as each of the two contacts 31 and 32 bites into the thermal spray coating 13, a force Fc in a direction to contract the thermal spray coating 13 positioned between the two contacts 31 and 32 is applied to the thermal spray coating 13. Because the thermal spray coating 13 positioned between the two contacts 31 and 32 is surely peeled off from the interface with the base material 12 and lifted up, the adhesion force is exerted. Can be suitably evaluated.

  Moreover, since the thermal spray coating 13 to be evaluated is the thermal spray coating 13 formed on the inner surface 12a of the cylinder block 10 while being applied to the inner surface of the bore 11, the relatively thick thermal spray coating 13 applied to the inner surface of the bore 11 is used. The adhesion force can be evaluated by a simple and inexpensive apparatus 20.

  The present invention can be applied to, for example, an application for measuring the adhesion of a thermal spray coating formed on the base material surface of a cylinder block while being applied to the bore inner surface.

It is a schematic block diagram which shows the adhesive force evaluation apparatus of the thermal spray coating which concerns on embodiment of this invention. 2A is a bottom view showing details of the sensor unit shown in FIG. 1, and FIG. 2B is a cross-sectional view taken along line 2B-2B of FIG. 3A to 3C are views showing a state in which the sprayed coating can be peeled off from the interface between the sprayed coating and the base material. It is a figure where it uses for description of the mechanism in which the sprayed coating located between two contacts floats up. FIG. 5A is a diagram for explaining the definition of the amount of lift of the thermal spray coating, and FIG. 5B is an example of the amount of lift of the thermal spray coating on the test piece with high adhesion and the test piece with low adhesion. It is a graph to show. FIG. 6A is a flowchart showing a procedure for creating a calibration curve representing the relationship between the amount of lift of the thermal spray coating located between the two contacts and the value of the adhesion force between the base material and the thermal spray coating. FIG. 6B is a diagram showing an example of the created calibration curve. It is a flowchart which shows the procedure which judges and evaluates the adhesive force of a thermal spray coating. FIG. 8 (A) is a diagram showing the state of floating of the thermal spray coating in an example in which the adhesion of the iron-based thermal spray coating formed on the aluminum base material is evaluated, and FIG. 8 (B) is a diagram of two contactors. It is a figure which shows the relationship between the space | interval between and the amount of floats of a thermal spray coating. FIG. 9A is a diagram showing the effect of the interval between the two contacts on the correlation function R, and FIG. 9B shows the effect of the interval between the two contacts on the variation σ. FIG.

Explanation of symbols

10 cylinder block,
11 Bore,
12 Base material,
12a base material surface,
13 Thermal spray coating,
20 Thermal spray coating adhesion evaluation device,
30 sensor unit,
31, 32 Two contacts,
31a, 32a working surface,
33 application means,
35 detecting means,
50 means of transportation,
70 Calibration curve (Relationship between the amount of sprayed coating lifting and the value of adhesion)
100 control means,
110 storage means,
Fc Force in the direction of shrinking the thermal spray coating located between the two contacts,
L The distance between the two contacts.

Claims (5)

In an apparatus for evaluating the adhesion between the base material and the thermal spray coating formed on the surface of the base material,
Two contacts arranged at intervals along one direction and scratching the surface of the sprayed coating;
Applying means for applying a load when scratching the tips of the two contacts;
Moving means for moving the two contacts in another direction orthogonal to the one direction so as to scratch the surface of the thermal spray coating;
Detecting means for detecting a floating amount of the thermal spray coating positioned between the two contacts in a direction perpendicular to the one direction and the other direction;
Control means for controlling the operation of the moving means and evaluating the adhesion between the base material and the thermal spray coating,
The control means actuates the moving means to move the two contacts loaded at the tip by the applying means in the other direction so as to scratch the surface of the sprayed coating, and the detecting means The adhesion force of the thermal spray coating is characterized by evaluating the adhesion force between the base material and the thermal spray coating on the basis of the lift amount of the thermal spray coating positioned between the two contacts detected by Evaluation device. A storage means for recording the relationship between the amount of lifting of the thermal spray coating positioned between the two contacts and the value of the adhesion between the base material and the thermal spray coating;
The said control means estimates the value of the adhesive force between the said base material and the said thermal spray coating based on the detected amount of lifting and the said relationship recorded on the said memory | storage means. An apparatus for evaluating the adhesion of a thermal spray coating as described in 1.   2. The thermal spray coating adhesion evaluation apparatus according to claim 1, wherein an interval between the two contacts is 1 mm to 2 mm.   Each of the two contacts has an action surface that applies a force in a direction to shrink the sprayed coating located between the two contacts as it bites into the sprayed coating. The thermal spray coating adhesion evaluation apparatus according to claim 1, wherein   2. The thermal spray coating adhesion evaluation apparatus according to claim 1, wherein the thermal spray coating to be evaluated is a thermal spray coating applied to the inner surface of the bore and formed on the surface of the base material of the cylinder block.

Images