Inspection device, inspection method, and method for manufacturing disc brake pad

Abstract

The present invention provides an inspection device, an inspection method and a method for manufacturing a disc brake plate. The inspection device (1) comprises: a support portion (10) supporting a plate-shaped inspection object (400) at an upper end portion (101) of the support portion (10); and a force sensor (20) fastened to a lower end portion (102) of the support portion (10), the force sensor (20) being used to detect a force in a gravity direction and a moment around an axis orthogonal to the gravity direction acting on the support portion (10) from the inspection object (400) in a non-rotating state.

Description

Technical Field

[0001] The present invention relates to an inspection device and an inspection method for inspecting the center of gravity of a plate-shaped inspection object, and a method for manufacturing a disc brake plate. Background Art

[0002] A brake disc installation state inspection device is known that inspects whether a brake disc is fixed vertically with respect to an axle. For example, the brake disc installation state inspection device disclosed in Patent Document 1 includes: a fixing unit that is fixed to a bolt or a nut in a detachable manner, the bolt or the nut being fastened to a non-rotating portion that supports the brake disc in a rotatable manner; a brake disc contact member that is composed of an elastic body that can abut against the side surface of the brake disc; a connecting unit that supports the brake disc contact member on the fixing unit in a freely adjustable position; a strain gauge that is provided on a flexible portion of the brake disc contact member; and an installation state determination unit that determines the installation state of the brake disc based on the output of the strain gauge.

[0003] In addition, for plate-shaped manufactured products such as brake discs, there is a known technique for measuring the center of gravity and checking whether the measured center of gravity position matches the center of gravity position of a normal product. A static balance tester is known as one type of inspection device capable of such an inspection.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Laid-Open No. 6-323352 Summary of the invention

[0007] Problem that the invention aims to solve

[0008] However, previous static balance checkers were unable to obtain the applied moments and the coordinates of the center of gravity.

[0009] An object of one embodiment of the present invention is to realize an inspection device, an inspection method, and a method for manufacturing a disc brake pad that can inspect the center of gravity of a plate-shaped inspection object and detect an applied moment and the coordinates of the center of gravity.

[0010] Solutions for solving problems

[0011] In order to solve the above-mentioned problem, an inspection device involved in one embodiment of the present invention is an inspection device for inspecting the center of gravity of a plate-shaped inspection object, and the inspection device comprises: a support portion, which supports the inspection object at the upper end of the support portion; and a force sensor, which is fastened to the lower end of the support portion, and the force sensor is used to detect the force along the direction of gravity and the moment around the axis orthogonal to the direction of gravity acting on the support portion from the inspection object in a non-rotating state.

[0012] In order to solve the above-mentioned problem, an inspection method involved in one embodiment of the present invention is an inspection method for using the above-mentioned inspection device to inspect the center of gravity of a plate-shaped inspection object, and the inspection method includes: a supporting process, supporting the inspection object at the upper end of the supporting part; and a detection process, using the force sensor to detect the force along the direction of gravity and the moment around the axis orthogonal to the direction of gravity acting on the supporting part from the inspection object supported by the supporting process.

[0013] In order to solve the above-mentioned problem, a manufacturing method of a disc brake plate involved in one embodiment of the present invention includes: a turning process, turning a plate-shaped inspection object serving as a base material of the disc brake plate; and an inspection process, using the above-mentioned inspection device to inspect the center of gravity of the plate-shaped inspection object after being turned in the turning process.

[0014] Effects of the Invention

[0015] According to one embodiment of the present invention, it is possible to realize an inspection device, an inspection method, and a method for manufacturing a disc brake pad that can inspect the center of gravity of a plate-shaped inspection object and detect the moment and the center of gravity coordinates. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a cross-sectional view of an inspection device according to one embodiment of the present invention.

[0017] Figure 2 It is shown Figure 1 A block diagram of the structure of the inspection device is shown.

[0018] Figure 3 yes Figure 1 A perspective view of a force sensor included in the inspection device shown.

[0019] Figure 4 Shows the representation Figure 1 An example of a screen display of inspection results by the inspection device shown.

[0020] Figure 5 This is a flowchart illustrating a processing procedure of an inspection method according to one embodiment of the present invention.

[0021] Figure 6 It is a flowchart explaining the processing steps of the manufacturing method involved in one embodiment of the present invention. DETAILED DESCRIPTION

[0022] <Structure of inspection device>

[0023] Reference Figure 1 and Figure 2 Next, an inspection device 1 according to an embodiment of the present invention will be described. Figure 1 is a cross-sectional view of the inspection device 1 . Figure 2 is a block diagram showing the structure of the inspection device 1. Figure 1 In the figure, a part of the structure is shown in a cross-sectional view for the convenience of explanation.

[0024] The inspection device 1 is an inspection device for inspecting the center of gravity of a plate-shaped inspection object 400. Here, as an example, the inspection object 400 is a disc-shaped casting having a draft angle after turning, which is a base material of a disc brake plate. The inspection object 400 can also be called a disc brake plate that has been turned. However, the inspection object 400 is not limited to the disc brake plate that has been turned. For example, a disc-shaped structure, a flat rectangular structure, etc. can also be used as the inspection object 400. These plate-shaped inspection objects do not need to be symmetrical.

[0025] The inspection device 1 includes a support portion 10 and a force sensor 20. The support portion 10 is a columnar structure having a central axis in the vertical direction. In addition, in the present embodiment, the vertical direction is defined as the Z axis. In addition, the accompanying drawings also show an XYZ three-dimensional coordinate system in which a plane perpendicular to the Z axis is defined as an XY plane and the X-axis and Y-axis directions are defined.

[0026] The support portion 10 includes an upper end portion 101 located at the front end on the positive side of the Z axis, a lower end portion 102 corresponding to the end on the negative side of the Z axis, and an intermediate portion 103 connecting the upper end portion 101 and the lower end portion 102. The inspection object 400 is placed on the upper end portion 101. In the case where the inspection object 400 is the above-mentioned disc brake plate that has been turned, the upper end portion 101 is fitted into a recessed portion ( Figure 1 The upper end portion 101 has a structure with a tapered front end, so that even if the type of the inspection object changes, the upper end portion 101 can be well fitted in the fitting portion of each inspection object. The upper end portion 101 supports the inspection object 400 in this way.

[0027] The middle part 103 is a columnar body with a small diameter, and the upper end part 101 is fixed to one end of the middle part 103, and the lower end part 102 is fixed to the other end. There is no particular restriction on the small diameter as long as it is smaller than the diameter of the inspection object. There is no particular restriction on the length in the Z-axis direction as long as it can achieve a state in which the inspection object is supported only by the upper end part 101.

[0028] The lower end portion 102 constitutes the end portion on the negative Z-axis side of the support portion 10. The force sensor 20 is fastened to the lower surface of the lower end portion 102 (the surface facing the negative Z-axis direction). The lower end portion 102 has a flange portion that protrudes in the diameter expansion direction compared to the outer peripheral surface of the middle portion 103. In other words, the lower end portion 102 is in a flange shape and protrudes in the diameter expansion direction compared to the outer peripheral surface of the middle portion 103. The lower end portion 102 (flange portion) protrudes in the diameter expansion direction, thereby ensuring a wide connection area with the force sensor 20.

[0029] The force sensor 20 is fastened to the lower end portion 102 of the support portion 10, and is used to detect the force in the direction of gravity and the moment about an axis orthogonal to the direction of gravity acting on the support portion 10 from the non-rotating inspection object 400. The force sensor 20 is a six-axis force sensor, but may also be a three-axis force sensor. Figure 3 The force sensor 20 which is a six-axis force sensor will be described.

[0030] Figure 3 FIG. 2 is a perspective view of a force sensor 20 as a six-axis force sensor. Figure 3 As shown, the force sensor 20 includes a strain generating body 11 and a strain gauge group consisting of six strain gauges 12a1, 12a2, 12b1, 12b2, 12c1, and 12c2. Here, the six-axis force sensor is a force sensor that can detect the X-axis direction component, Y-axis direction component, Z-axis direction component, moment component around the X-axis, moment component around the Y-axis, and moment component around the Z-axis of the external force. In addition, the strain generating body 11 is configured in a manner that the two main surfaces are parallel to the XY plane. The main surface on the positive direction side of the Z axis, which is one of the pair of main surfaces of the strain generating body 11, is called the main surface 11a, and the main surface on the negative direction side of the Z axis, which is the other main surface, is called the main surface 11b.

[0031] In addition, the force sensor 20 is an example, and other existing force sensors may also be used. For example, regarding the structure of the force sensor, the Japanese Patent Application No. 2020-165898 (Japanese Patent Application No. 2019-068598) may also be applied. Figure 1 and Figure 2 The force sensor described.

[0032] In addition, the force sensor 20 includes a plurality of resistor elements and a plurality of bridge circuits in addition to the strain generating body 11 and the strain gauges 12a1, 12a2, 12b1, 12b2, 12c1, and 12c2. However, in the present embodiment, the strain generating body 11 and the strain gauges 12a1, 12a2, 12b1, 12b2, 12c1, and 12c2 are described, and the description of the plurality of resistor elements and the plurality of bridge circuits is omitted. Regarding the structure of the plurality of resistor elements and the plurality of bridge circuits, it is possible to apply existing force sensors (for example, those disclosed in Japanese Patent Publication No. 2020-165898) Figure 1 and Figure 2 The structure of the force sensor described in the specification.

[0033] The strain generating body 11 is a plate-shaped member made of elastic material. Figure 3 As shown, the strain generating body 11 includes a core 111, a frame 112 surrounding the core 111, and arm portions 113a to 113c connecting the core 111 and the frame 112. Examples of the material of the strain generating body 11 include conductors such as aluminum alloy, alloy steel, stainless steel, and dielectrics such as ceramics, resins, and glass. In the present embodiment, the strain generating body 11 is made of ceramics, which is an example of a dielectric.

[0034] In addition, as a processing method of the strain generating body 11, mechanical processing of a base material as a plate-like member with uniform thickness can be cited. As an example of mechanical processing, cutting can be cited. Regarding cutting, NC (Numerical Control) processing can be preferably used. In addition, when an external force acts on the core 111 in a state where the frame portion 112 is fixed, a strain corresponding to the external force is generated in the arm portions 113a to 113c. Therefore, the core 111 is sometimes referred to as a "force-bearing portion" and the frame portion 112 is sometimes referred to as a "fixed portion".

[0035] The force sensor 20 is formed by connecting the main surface 11a on the positive direction side of the Z axis, which is one of the main surfaces of the pair of main surfaces of the strain generating body 11, to the main surface 11a on the positive direction side of the Z axis. Figure 1The lower surface of the lower end portion 102 (flange portion) of the support portion 10 shown faces each other, and the lower surface is fastened to the core portion 111. The lower end portion 102 (flange portion) of the support portion 10 has a size that can be fastened to the core portion 111. The central axis of the middle portion 103 of the support portion 10 is located above the central point of the strain generating body 11. By setting such a structure, the force sensor 20 becomes a structure in which an external force acts on the core portion 111, that is, a force acting on the support portion 10 from the inspection object 400 in a non-rotating state. The force sensor 20 detects the Z-axis component of the force. The Z-axis component of the force is equivalent to "the force in the direction of gravity acting on the support portion 10 from the inspection object 400 in a non-rotating state". In addition, the force sensor 20 detects the moment component of the force around the X-axis and the moment component around the Y-axis. These components are equivalent to "the moment around the axis orthogonal to the gravity direction".

[0036] In addition, there is no particular limitation on the shape of the core 111, but in the present embodiment, a column shape with a substantially triangular bottom surface (i.e., a substantially triangular prism shape) is adopted as the shape of the core 111. In addition, there is no particular limitation on the shape of the frame 112, but in the present embodiment, a ring shape is adopted as the shape of the frame 112. The outer periphery and the inner periphery of the frame 112 are both substantially circular and are formed in a concentric manner. The strain generating body 11 is formed by processing a substrate of uniform thickness as described above. Therefore, the thickness of the core 111 is substantially equal to the thickness of the frame 112 (equal in the present embodiment). The core 111 is accommodated inside the inner periphery of the frame 112 in such a manner that the center of the ring-shaped frame 112 coincides with the center of gravity of the core 111.

[0037] In the present embodiment, as the shape of the arm portions 113a to 113c, a column shape (i.e., a substantially quadrangular prism shape) having a substantially quadrilateral cross section and extending in one direction is adopted. In addition, there is no particular limitation on the number of the arm portions 113a to 113c, but in the present embodiment, the number of the arm portions 113a to 113c is set to 3. The arm portion 113a extends from the core portion 111 in the negative direction of the Y axis to connect the core portion 111 to the frame portion 112. In addition, the arm portion 113b extends in the direction of -120° (120° clockwise) from the negative direction of the Y axis in the XY plane to connect the core portion 111 to the frame portion 112. In addition, the arm portion 113c extends from the core portion 111 in the direction of +120° (120° counterclockwise) from the negative direction of the Y axis in the XY plane to connect the core portion 111 to the frame portion 112.

[0038] However, the shapes of the core 111, the frame 112, and the arms 113a to 113c are not limited to the above shapes. For example, the core 111, the frame 112, and the arms 113a to 113c may be as described in Japanese Patent Application Publication No. 2020-165898. Figure 1 That shape.

[0039] like Figure 2 As shown, the inspection device 1 also includes a control unit 30 (determination unit) capable of controlling each component. The control unit 30 obtains the output signal of the force sensor 20. The control unit 30 obtains a signal representing the force in the gravity direction (negative direction of the Z axis) and the moment around the axis orthogonal to the gravity direction, which are detected by the force sensor 20 and acted on the support unit 10 from the inspection object 400 in a non-rotating state. In addition, the control unit 30 determines the center of gravity of the inspection object 400. The moment component around the X axis and the moment component around the Y axis detected by the force sensor 20 indicate that the center of gravity position has shifted. Therefore, since the weight can be calculated based on the above-mentioned Z-axis direction component, the control unit 30 can obtain the position after the shift relative to the center position, that is, the center of gravity position, by dividing the value of the moment component around the X axis (or the moment component around the Y axis) by the weight.

[0040] The control unit 30 further determines whether the determined center of gravity is at the position of the center of gravity that the inspection object 400 should have. To this end, the control unit 30 uses information on the position of the center of gravity that the inspection object 400 should have and information on the center of gravity determined based on the output signal of the force sensor 20. That is, the control unit 30 is configured such that information related to the inspection object 400 is pre-registered or pre-input into the control unit 30, and the control unit 30 obtains information related to the center of gravity that the inspection object 400 should have, for example, via a server. In addition, the information related to the center of gravity that the inspection object 400 should have may also be a structure that the control unit 30 itself has.

[0041] Here, the information related to the center of gravity that the inspection object 400 should have is information indicating the position coordinates of the center of gravity that the inspection object 400 should have. In addition, the position coordinates of the center of gravity that the inspection object 400 should have may include coordinates indicating the range when the position of the center of gravity that the inspection object 400 should have is within a prescribed allowable range.

[0042] The control unit 30 compares the position coordinates of the center of gravity determined based on the output signal of the force sensor 20 (hereinafter sometimes referred to as the "determined center of gravity") with the position coordinates of the center of gravity that the inspection object 400 should have (hereinafter sometimes referred to as the "center of gravity of a normal product"). In addition, the control unit 30 determines whether the determined center of gravity is at the center of gravity position of a normal product (is within the allowable range that can be regarded as a normal product). One reason why the determined center of gravity is located at a position coordinate different from the center of gravity of a normal product is that the structure of the inspection object 400 itself is defective. Regarding the structural defects of the inspection object 400 itself, in addition to deformation or notches, when the inspection object 400 is a disk-shaped casting that has been turned and is the base material of a disc brake plate, defects associated with casting or defects in turning can also be listed.

[0043] Here, the control unit 30 further determines the polar angle (unit: deg) when the position of the center of gravity of the inspection object 400 is expressed in polar coordinates with the position of the center of gravity of the normal product as the origin, and the moment (unit: Ncm) around the axis orthogonal to the gravity direction, based on the determined position coordinates of the center of gravity and the position coordinates of the center of gravity of the normal product. In addition, the control unit may determine at least one of these.

[0044] like Figure 2 As shown, the inspection device 1 includes an output unit 40 for outputting the result determined by the control unit 30. The output unit 40 outputs the result determined by the control unit 30, that is, outputs information indicating whether the determined center of gravity is the center of gravity of a normal product (the center of gravity within the allowable range). In the case where the output unit 40 includes a display device, it can be displayed in the following manner: an image obtained by synthesizing an image showing the determined center of gravity and an image showing the center of gravity of a normal product (the center of gravity within the allowable range) into an image schematically showing a top view of the inspection object 400 is displayed on a display screen of the display device. Figure 4 Let's explain this.

[0045] Figure 4 5 is an example of an image 500 displayed on a display screen of a display device included in the output unit 40. In the image 500, an image 501 schematically showing a top view of the inspection object 400 includes an image 502 showing the determined center of gravity, an image 503 showing the center of gravity of a normal product, and an image 504 showing the allowable range of the center of gravity. In addition, the right side of the image 500 includes an image 505 showing the position coordinates of the determined center of gravity, the polar angle (in Figure 4In this way, by having the function of displaying and notifying, the operator at the inspection site or the manufacturing site where the inspection object is manufactured can know the center of gravity of the inspection object 400, and thus can know whether the inspection object is a normal product (product or a structure that is the base material of the product).

[0046] In addition, Figure 4 In the image 500, in addition to displaying the above-mentioned images 501 to 505, the measurement data of the force sensor 20 can also be displayed as an image in the form of a graph, for example. Figure 4 In the image 500, the judgment result of judging whether the inspection object 400 is a normal product having the center of gravity of a normal product (center of gravity within the allowable range) may be displayed instead of the above-mentioned images 501 to 505. For example, it is also possible to display the character "OK" when the inspection object 400 is a normal product and the character "NG" when the inspection object 400 is not a normal product. In addition, the above-mentioned display device can be arranged in a management room separated from the turning operation site in addition to being arranged at the turning operation site.

[0047] As described above, according to the inspection device 1 of this embodiment, the force sensor 20 fastened to the lower end portion 102 of the support portion 10 can detect the force in the direction of gravity and the moment around the axis orthogonal to the direction of gravity acting on the support portion 10 from the plate-shaped inspection object 400 in a non-rotating state. As a result, the position of the center of gravity of the inspection object 400 can be statically determined. The inspection device 1 of this embodiment can also be called a static balance tester. In addition, according to the above-mentioned structure, it is possible to determine whether there is a deviation in the position of the center of gravity relative to a normal product, thereby determining whether the inspection object 400 is a normal product.

[0048] Furthermore, according to the inspection apparatus 1 of the present embodiment, the position of the center of gravity of the inspection object can be statically determined using one force sensor 20 , so control is simple and calibration can be performed in a short time.

[0049] In addition, as described above, the lower end portion 102 of the support portion 10 has a flange portion that protrudes in the direction of the diameter expansion relative to the outer peripheral surface of the middle portion 103. As a result, it is easy to detect the force in the gravity direction and the moment around the axis orthogonal to the gravity direction acting on the support portion from the inspection object by the force sensor.

[0050] Furthermore, the inspection apparatus 1 can also measure the weight of the inspection object 400 supported by the support portion 10 using the force sensor 20 .

[0051] <Inspection method>

[0052] Figure 5 This is a flowchart showing the process of an inspection method for inspecting the center of gravity of a plate-shaped inspection object using the inspection device 1 of the present embodiment 1. The inspection method (S10) includes a supporting step (S11) and a detecting step (S12).

[0053] The supporting step S11 is a step of supporting the inspection object 400 at the upper end portion 101 of the supporting portion 10 .

[0054] In the detection step S12 , the force in the gravity direction and the moment about the axis orthogonal to the gravity direction acting on the support portion 10 from the inspection target 400 supported by the upper end portion 101 in the supporting step S11 are detected by the force sensor 20 .

[0055] In the detection step S12, the force sensor 20 is used to detect the force in the gravity direction and the moment around the axis orthogonal to the gravity direction acting on the support part 10 from the inspection object 400, thereby determining the center of gravity of the inspection object 400. The detection by the force sensor 20 has been described above, but in the detection step S12, the force sensor 20 detects the Z-axis direction component of the force in the gravity direction, the moment component around the X-axis, and the moment component around the Y-axis, and these detection results are obtained as output signals by the control unit 30, and the control unit 30 determines at least one of the position coordinates of the center of gravity of the inspection object 400, the above-mentioned polar angle, and the moment of the inspection object. In this way, the center of gravity of the inspection object 400 can be detected.

[0056] In addition, the detection step S12 may also include using the output unit 40 ( Figure 2 ) is used to carry out the notification process.

[0057] According to the inspection method S10 described above, the position of the center of gravity of the inspection object can be determined by detecting with the force sensor 20. Thus, it is possible to determine whether the center of gravity is offset from a normal product, and whether the inspection object is a normal product.

[0058] <Product Manufacturing Method>

[0059] The above inspection method can incorporate a turning process of turning a plate-shaped inspection object as a base material of a product (e.g., a disc brake plate) and an inspection process of inspecting the center of gravity of the plate-shaped inspection object after the turning process into a product manufacturing method. Figure 6 One way to illustrate how a product is made. Figure 6 : is a flow chart showing the process of the method for manufacturing the product of this embodiment. Figure 6As shown, the product manufacturing method (S20) includes an inspection step (S21), a determination step (S22), and a subsequent processing step (S23).

[0060] The inspection step S21 includes the above Figure 5 The supporting step S11 and the detecting step S12 may be included. In addition, as a pre-step of the inspection step S21 (supporting step S11), a turning step of turning the plate-shaped inspection object may be included.

[0061] In the determination step S22, it is determined whether the center of gravity of the inspection object 400 is within the allowable range. The center of gravity of the inspection object 400 is determined based on the force in the gravity direction and the moment around the axis orthogonal to the gravity direction acting from the inspection object 400 on the support part 10 detected by the force sensor 20 in the detection step S12. The determination step S22 is performed by the control unit 30 described above. If the result of the determination is that the center of gravity of the inspection object 400 is within the allowable range, the process proceeds to step S22. Figure 6 If the answer is "Yes", the subsequent processing step (S23) is performed. Here, when the inspection object 400 is a casting that has been turned as a base material of a disc brake plate, it is shipped as an example.

[0062] On the other hand, if the result of the determination shows that the center of gravity of the inspection object 400 is outside the permissible range, the Figure 6 If the answer is “No”, the subsequent processing step S23 will not be performed.

[0063] According to the manufacturing method S20 above, the inspection object 400 whose center of gravity is at the center of gravity position of a normal product can be determined, and only the determined inspection object 400 can be made to enter the subsequent processing step S23. Therefore, it can help to manufacture products with good precision. Such an effect can also help achieve Goal 9 of the Sustainable Development Goals (SDGs) advocated by the United Nations, "Building a foundation for industrial and technological innovation (infrastructure, system preparation, etc.)".

[0064] 〔Summarize〕

[0065] The inspection device involved in the first embodiment of the present invention is an inspection device for inspecting the center of gravity of a plate-shaped inspection object, and the inspection device comprises: a support portion, which supports the inspection object at the upper end of the support portion; and a force sensor, which is fastened to the lower end of the support portion, and the force sensor is used to detect the force along the direction of gravity and the moment around the axis orthogonal to the direction of gravity acting on the support portion from the inspection object in a non-rotating state.

[0066] According to the first aspect, the force sensor can be used to detect the center of gravity of the inspection object statically, thereby determining whether the center of gravity is offset from a normal product and whether the inspection object is a normal product.

[0067] The inspection device involved in the second embodiment of the present invention is further provided with a determination unit on the basis of the structure of the inspection device involved in the above-mentioned first embodiment, and the determination unit determines at least one of the following data based on the detection result detected by the force sensor, and the data include: the position of the center of gravity of the inspection object; the polar angle when the position of the center of gravity of the inspection object is expressed by polar coordinates with the position of the center of gravity of a normal product as the origin; and the moment around an axis orthogonal to the direction of gravity.

[0068] According to the second aspect, by providing the identification unit, it is possible to know whether the inspection object is a normal product.

[0069] In an inspection device according to a third aspect of the present invention, in addition to the configuration of the inspection device according to the first aspect or the second aspect, the inspection object may be in a disk shape.

[0070] The inspection method involved in the fourth embodiment of the present invention is an inspection method for inspecting the center of gravity of a plate-shaped inspection object using the inspection device recorded in any one of the first to third embodiments, and the inspection method includes: a supporting process, supporting the inspection object at the upper end of the supporting part; and a detection process, using the force sensor to detect the force along the direction of gravity and the moment around the axis orthogonal to the direction of gravity acting on the supporting part from the inspection object supported by the supporting process.

[0071] According to the fourth aspect, the position of the center of gravity of the inspection object can be determined by detecting with the force sensor, thereby determining whether there is a deviation in the center of gravity position relative to a normal product, and determining whether the inspection object is a normal product.

[0072] The manufacturing method of a disc brake plate involved in the fifth embodiment of the present invention includes: a turning process, turning a plate-shaped inspection object serving as a base material of the disc brake plate; and an inspection process, using an inspection device described in any one of the first to third embodiments to inspect the center of gravity of the inspection object after being turned in the turning process.

[0073] According to the fifth aspect, the plate-like inspection object whose center of gravity is at the center of gravity position of a normal product can be identified in the inspection step, so a desired disc brake disc can be manufactured.

[0074] [Additional Notes]

[0075] The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims. Embodiments obtained by appropriately combining technical methods disclosed in different embodiments are also included in the protection scope of the present invention.

Claims

1. An inspection device for inspecting the center of gravity of a plate-shaped inspection object, the inspection device comprising: a support portion, the inspection object being supported at an upper end portion of the support portion; and A force sensor is fastened to the lower end of the support portion, and is used to detect a force in the gravity direction and a moment around an axis orthogonal to the gravity direction acting on the support portion from the inspection object in a non-rotating state.

2. The inspection device according to claim 1, wherein: The device further comprises a determination unit, which determines at least one of the following data based on the detection result detected by the force sensor, wherein the data includes: The position of the center of gravity of the inspection object; a polar angle when the position of the center of gravity of the inspection object is expressed by polar coordinates with the position of the center of gravity of a normal product as the origin; and The moment about an axis orthogonal to the direction of gravity.

3. The inspection device according to claim 1 or 2, wherein: The inspection object is in the shape of a disk.

4. An inspection method is an inspection method for inspecting the center of gravity of an inspection object using an inspection device, the inspection device comprising: a support portion, the plate-shaped inspection object being supported at an upper end portion of the support portion; and a force sensor fastened to the lower end of the support portion, the force sensor being used to detect a force in the direction of gravity and a moment about an axis orthogonal to the direction of gravity acting on the support portion from the inspection object in a non-rotating state, The inspection method comprises: A supporting step of supporting the inspection object at the upper end portion of the supporting portion; as well as The detection step detects, using the force sensor, a force in the gravity direction and a moment around an axis orthogonal to the gravity direction, which act on the support portion from the inspection object supported in the supporting step.

5. A method for manufacturing a disc brake plate, comprising: a turning process for turning a plate-shaped inspection object which is a base material of a disc brake plate; as well as an inspection step of inspecting the center of gravity of the inspection object after the turning step using an inspection device, Wherein, the inspection device comprises: a support portion, the inspection object being supported at an upper end portion of the support portion; and A force sensor is fastened to the lower end of the support portion, and is used to detect a force in the gravity direction and a moment around an axis orthogonal to the gravity direction acting on the support portion from the inspection object in a non-rotating state.

Images