Hammer device, apparatus for detecting faulty of welded part, and method using the same

Abstract

A tapping device and a defect detection device and method for a welded part including the same are disclosed. A percussion device according to an embodiment of the present invention may include: a driving unit; an upper body that moves in a set direction by power generated by the driving unit; an elastic body provided on the upper body; a hammer provided on the elastic body; a force sensor provided on the hammer; and a support that supports the elastic body and the hammer.

Description

Technology Field

[0001] The present invention relates to a vehicle component detection device and a detection method using the same. Background Technology

[0002] Many of the components constituting a vehicle's automatic transmission are assembled by welding, and electron beam welding (EBW) is widely used as the welding method.

[0003] When welding parts using electron beam welding, welding defects frequently occur due to the magnetization of the parts, the electron beam, or environmental influences.

[0004] Conventionally, to detect welding defects, visual inspection methods were used to identify defects by visually inspecting the welded area, or cut inspection methods were used to determine whether internal defects had occurred by cutting the welded part.

[0005] While visual inspection methods allow for 100% inspection, they had the problem of being unable to identify weld depth or weld misalignment in welded areas. Additionally, although cutting inspection methods could accurately determine welding defects, they faced the issue of being unable to perform 100% inspection and being limited to sampling inspection because they required the destruction of the parts.

[0006] The matters described in this background technology section are written to enhance understanding of the background of the invention and may include matters that are not prior art already known to those skilled in the art to which this technology belongs. The problem to be solved

[0007] The present invention aims to solve the problems described above by providing a tapping device capable of performing a full inspection of welded parts, a defect detection device for welded parts including the same, and a method. means of solving the problem

[0008] A percussion device according to an embodiment of the present invention for achieving the above-described purpose may include: a driving unit; an upper body that moves in a set direction by power generated from the driving unit; an elastic body provided on the upper body; a hammer provided on the elastic body; a force sensor provided on the hammer; and a support that supports the elastic body and the hammer.

[0009] The above elastic body may be provided with a hammer frame that supports the hammer.

[0010] The above-mentioned base may be formed of an elastic material to absorb vibrations of the hammer and the elastic body.

[0011] The tapping device according to an embodiment of the present invention may further include a control device for controlling the position of the upper body.

[0012] A defect detection device for a welded part according to another embodiment of the present invention may include: a tapping device that applies an external force to a part to be measured and measures the magnitude of the force applied to the part to be measured; a vibration sensor that measures vibrations generated in response to the force applied to the part to be measured by the tapping device; and a controller that calculates a frequency response function (FRF) that takes the force applied to the part to be measured by the tapping device as input and the vibration detected by the vibration sensor as output, and determines whether the part to be measured is defective based on whether a peak value is detected in the peak-in region and the peak-out region of the frequency response function.

[0013] The above-described striking device may include a driving unit; an upper body that moves in a set direction by power generated by the driving unit; an elastic body provided on the upper body; a hammer provided on the elastic body; a force sensor provided on the hammer; and a support base that supports the elastic body and the hammer.

[0014] The above-mentioned base may be formed of an elastic material to absorb vibrations of the hammer and the elastic body.

[0015] The above controller may determine that the measured component is defective if a peak value is not detected in the peak-in region of the frequency response function.

[0016] The above controller can determine that the measured component is defective if a peak value is detected in the peak-out region of the frequency response function.

[0017] A method for detecting defects in a welded part according to another embodiment of the present invention may include: a step of detecting a force applied to a part to be measured by a force sensor; a step of detecting a vibration occurring in the part to be measured by a vibration sensor; a step of calculating a frequency response function (FRF) by a controller, wherein the force detected by the force sensor is input and the vibration detected by the vibration sensor is output; a step of setting a predetermined peak-in region and a peak-out region in the frequency response function by the controller; and a step of determining whether the part to be measured is defective based on whether a peak value is detected in the peak-in region and the peak-out region of the frequency response function by the controller.

[0018] In the step of determining whether there is a defect, if a peak value is not detected in the peak-in region, the part to be measured is determined to be defective, and if a peak value is detected in the peak-out region, the part to be measured is determined to be defective. Effects of the invention

[0019] According to the tapping device, the defect detection device for a welded part including the same, and the method according to the embodiment of the present invention as described above, by comparing the frequency response function of a good part with the frequency response function of a part to be measured to determine whether the part to be measured is defective, the defect status can be accurately determined through a full inspection of the part to be measured. Brief explanation of the drawing

[0020] These drawings are for reference to explain exemplary embodiments of the present invention, and therefore, the technical concept of the present invention should not be interpreted as being limited to the attached drawings. FIG. 1 is a perspective view illustrating the configuration of a defect detection device for welded parts according to an embodiment of the present invention. FIG. 2 is a side view illustrating the configuration of a defect detection device for welded parts according to an embodiment of the present invention. FIG. 3 is a block diagram illustrating the configuration of a defect detection device for welded parts according to an embodiment of the present invention. FIG. 4 is a perspective view illustrating the configuration of a tapping device (200) according to an embodiment of the present invention. FIG. 5 is a side view illustrating the configuration of a tapping device (200) according to an embodiment of the present invention. FIG. 6 is a flowchart illustrating a method for detecting defects in welded parts according to an embodiment of the present invention. FIGS. 7 to 10 are drawings for explaining the operation of a defect detection device for a welded part according to an embodiment of the present invention. FIG. 11 is a graph illustrating a frequency response function to explain the peak-in region according to an embodiment of the present invention. FIG. 12 is a graph illustrating a frequency response function to explain the peak-out region according to an embodiment of the present invention. Specific details for implementing the invention

[0021] Embodiments of the present invention are described in detail with reference to the attached drawings so that those skilled in the art can easily implement the invention. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein.

[0022] To clearly explain the present invention, parts unrelated to the explanation have been omitted, and the same reference numerals are used for identical or similar components throughout the specification.

[0023] In addition, the size and thickness of each component shown in the drawings are depicted arbitrarily for the convenience of explanation, so the present invention is not necessarily limited to what is shown in the drawings, and the thickness has been enlarged to clearly represent various parts and regions.

[0025] Hereinafter, a defect detection device for welded parts according to an embodiment of the present invention will be described in detail with reference to the attached drawings.

[0026] FIG. 1 is a perspective view illustrating the configuration of a defect detection device for a welded part according to an embodiment of the present invention. FIG. 2 is a side view illustrating the configuration of a defect detection device for a welded part according to an embodiment of the present invention. FIG. 3 is a block diagram illustrating the configuration of a defect detection device for a welded part according to an embodiment of the present invention.

[0027] As illustrated in FIGS. 1 to 3, a defect detection device for a welded part according to an embodiment of the present invention may include a tapping device (200), a vibration sensor (300), a controller (400), and a display device (500).

[0028] A tapping device (200) is provided on a base frame (100) that is mounted on a conveyor belt on which a part to be measured moves. The tapping device (200) applies an external force to the part to be measured and measures the magnitude of the force applied to the part to be measured. The magnitude of the force measured by the tapping device (200) is transmitted to a controller (400).

[0029] The vibration sensor (300) measures vibrations that occur in response to a force applied to a part to be measured by a tapping device (200), and the measured vibrations are transmitted to a controller (400).

[0030] The controller (400) takes the force applied to the part to be measured by the tapping device (200) as input and calculates a frequency response function (FRF) that takes the vibration detected by the vibration sensor (300) as output, and determines whether the part to be measured is defective from the peak value generated in the frequency response function.

[0031] To this end, the controller (400) may be equipped with one or more processors that operate according to a set program, and said set program is configured to perform each step of the method for detecting defects in welded parts according to an embodiment of the present invention.

[0032] Whether a part to be measured is defective, as determined by the controller (400), can be displayed on the display device (500). To this end, the display device (500) may be implemented as a liquid crystal display (LCD), a portable terminal such as a smartphone or tablet computer, or a desktop computer.

[0034] The configuration of the tapping device (200) according to an embodiment of the present invention will be described in detail with reference to the attached drawings.

[0035] FIG. 4 is a perspective view illustrating the configuration of a tapping device (200) according to an embodiment of the present invention. FIG. 5 is a side view illustrating the configuration of a tapping device (200) according to an embodiment of the present invention.

[0036] Referring to FIGS. 4 and 5, the tapping device (200) may include a driving part (220), an upper body (230), an elastic body (240), a hammer (250), a force sensor (251), and a base (260).

[0037] The driving unit (220) can be implemented through a hydraulic cylinder or a pneumatic cylinder that moves the upper body (230) in a set direction (e.g., up and down). The driving unit (220) can be operated by a control signal from a controller (400).

[0038] In an embodiment of the present invention, the driving unit (220) can be mounted on the base frame (100) through the control device (210).

[0039] The adjustment device (210) is for adjusting the driving unit (220) and the upper body (230) to an appropriate position according to the size of the part to be measured. The adjustment device (210) may include an adjustment frame (211) fixedly installed on the base frame (100), and a movable frame (218) that is installed to be movable in the vertical direction on the adjustment frame (211) and fixedly installed with the upper body (230). At this time, the movable frame (218) may be mounted on the upper body (230) via a connecting frame (219).

[0040] A plurality of adjustment grooves (212) are formed in the vertical direction of the adjustment frame (211), and an adjustment nut (214) can be inserted into the adjustment groove (212). By inserting an adjustment nut (214) into one of the adjustment grooves (212) to fix the movable frame (218), the height of the upper body (230) mounted on the movable frame (218) can be adjusted.

[0041] The upper body (230) reciprocates in a direction set by the operation of the drive unit (220). An elastic body (240) is mounted on one end of the drive unit (220). The elastic body (240) may be made of a silicone rubber pad. The elastic body (240) may be mounted to the upper body (230) through a fixing frame (241) that is mounted on one end of the upper body (230) and secures the elastic body (240).

[0042] A hammer (250) is mounted on the other end of the elastic body (240). At this time, the hammer (250) may be mounted on a hammer frame (252) mounted on the other end of the elastic body (240). The hammer (250) is a component for applying external force to a part to be measured. Since one end of the elastic body (240) is mounted to the upper body (230) through a fixed frame (241), the elastic body (240) can perform the role of a kind of cantilever.

[0043] The hammer (250) is mounted on the other end of an elastic body (240) that is fixed at one end. At this time, the hammer (250) can be mounted to the elastic body (240) through a hammer frame (252) mounted on the end of the elastic body (240). The hammer frame (252) serves to fix the hammer (250) to the elastic body (240) and can also serve as an inertial mass when an external force is applied to a part to be measured through the hammer (250).

[0044] A force sensor (251) is mounted on the hammer (250), and the force sensor (251) measures the magnitude of the force applied to the part to be measured when an external force is applied to the part to be measured by the hammer (250), and the measured signal is transmitted to the controller (400). The force sensor (251) can be implemented through an acceleration sensor. For example, the acceleration sensor detects the acceleration generated when the hammer (250) comes into contact with the part to be measured, and the magnitude of the force applied to the part to be measured can be measured through the acceleration detected by the acceleration sensor and the mass of the hammer (250).

[0045] The upper body (230) may be provided with a support (260) that supports an elastic body (240) and a hammer (250) (or a hammer frame (252) on which the hammer (250) is mounted). The support (260) may be made of an elastic material (e.g., rubber) so as not to cause residual vibration in the elastic body (240) and the hammer frame (252) which are restored to their original positions after elastic deformation. To this end, the support (260) may be provided at the central lower part of the hammer frame (252) and the central lower part of the elastic body (240).

[0047] Hereinafter, a method for detecting defects in welded parts according to an embodiment of the present invention as described above will be explained in detail with reference to the attached drawings.

[0048] FIG. 6 is a flowchart illustrating a method for detecting defects in welded parts according to an embodiment of the present invention.

[0049] As illustrated in FIG. 6, when a part to be measured (e.g., a gear module used in an automatic transmission) moves to a set position (e.g., a set position on a conveyor belt), the user adjusts the vertical height of the tapping device (200) according to the size of the part to be measured through the adjustment device (210) (see FIG. 7).

[0050] When the part to be measured is moved to a set position, the controller (400) operates the tapping device (200) to apply an external force to the part to be measured (S10).

[0051] Specifically, when the controller (400) drives the drive unit (220) (e.g., a pneumatic cylinder or a hydraulic cylinder) in an upward direction, the elastic body (240) mounted on one end of the drive unit (220) moves upward, and the opposite end of the elastic body (240) on which the hammer (250) is mounted moves upward due to elastic deformation, thereby applying an external force to the part to be measured as the hammer (250) strikes the part to be measured (see FIG. 8). When the elastic body (240) on which the hammer (250) is mounted returns downward, the elastic body (240) and the hammer frame (252) on which the hammer (250) is mounted are placed on a base (260) formed of an elastic material. Thus, vibration of the elastic body (240) and the hammer frame (252) can be prevented.

[0052] The force sensor (251) equipped in the hammer (250) measures the magnitude of the force applied to the part to be measured and transmits it to the controller (400) (S20).

[0053] The vibration sensor (300) measures the vibration generated in the part to be measured in response to the external force applied to the part to be measured by the hammer (250) and transmits it to the controller (400) (S30).

[0054] The controller (400) takes the force applied to the part to be measured transmitted from the force sensor (251) as input and calculates a frequency response function (FRF) that takes the vibration transmitted from the vibration sensor (300) as output (S40).

[0055] A frequency response function for a good product is stored in advance in the controller (400), and the controller (400) maps the frequency response function of the good product to the calculated frequency response function (S50).

[0056] At this time, the frequency response function of the good part has a preset peak-in region and a peak-out region, and the controller (400) determines whether the part to be measured is defective based on whether a peak value is detected in the peak-in region and the peak-out region (S60).

[0057] Here, the peak-in region refers to the region where a peak value should be detected in the corresponding frequency range, and the peak-out region refers to the region where a peak value should not be detected in the corresponding frequency range.

[0058] That is, if a peak value is not detected in the peak-in region of the frequency response function calculated from the component to be measured, the controller (400) may determine that the component to be measured is defective (see FIG. 11). Alternatively, if a peak value is detected in the peak-out region of the frequency response function calculated from the component to be measured, the controller (400) may determine that the component to be measured is defective (see FIG. 12).

[0059] The peak-in region and the peak-out region can be determined in advance by calculating the frequency response function of a plurality of measurement target components. The determined peak-in region and the peak-out region can be stored in advance in the controller (400).

[0060] Whether the measurement target part is defective, as determined by the controller (400), can be displayed on the display device (500).

[0061] According to the device and method for detecting defects in welded parts according to the embodiment of the present invention as described above, the frequency response function of a part to be measured is calculated through a tapping device (200) and a vibration sensor (300), and the defect status of the part to be measured can be determined from whether a peak value is detected in the peak-in region and the peak-out region of the frequency response function of the part to be measured. Accordingly, the defect status of the part to be measured can be quickly identified, and a full inspection of the part to be measured is possible.

[0062] Although preferred embodiments of the present invention have been described above, the present invention is not limited thereto and can be implemented with various modifications within the scope of the claims, the detailed description of the invention, and the attached drawings, and it is obvious that such modifications also fall within the scope of the present invention. Explanation of the symbols

[0064] 100: Base Frame 200: Striking device 210: Control device 211: Adjustment Frame 212: Adjustment Home 214: Adjustment nut 218: Moving Frame 219: Connection Frame 220: Drive unit 230: Upper body 240: Elastic body 241: Fixed Frame 250: Hammer 251: Force sensor 252: Hammer Frame 260: Stand 300: Vibration sensor 400: Controller 500: Display device

Claims

Claim 1 A striking device comprising: a driving unit; an upper body that moves in a set direction by power generated from the driving unit; an elastic body provided on the upper body; a hammer provided on the elastic body; a force sensor provided on the hammer; and a support base that supports the elastic body and the hammer; wherein the elastic body is provided with a hammer frame that supports the hammer, and the support base is provided at the central lower part of the hammer frame and the central lower part of the elastic body. Claim 2 delete Claim 3 In claim 1, the support is a striking device formed of an elastic material to absorb vibrations of the hammer and the elastic body. Claim 4 A tapping device further comprising, in claim 1, a control device for adjusting the position of the upper body. Claim 5 A tapping device that applies an external force to a part to be measured and measures the magnitude of the force applied to the part to be measured; a vibration sensor that measures vibrations generated in response to the force applied to the part to be measured by the tapping device; and a controller that takes the force applied to the part to be measured by the tapping device as input, calculates a frequency response function (FRF) that takes the vibration detected by the vibration sensor as output, and determines whether the part to be measured is defective based on whether a peak value is detected in the peak-in region and the peak-out region of the frequency response function; wherein the tapping device includes a driving unit; an upper body that moves in a set direction by power generated by the driving unit; an elastic body provided on the upper body; a hammer provided on the elastic body; a force sensor provided on the hammer; and a support base that supports the elastic body and the hammer; wherein the elastic body is provided with a hammer frame that supports the hammer, and the support base is provided at the central lower part of the hammer frame and the central lower part of the elastic body. Claim 6 delete Claim 7 In paragraph 5, the above-mentioned base is a defect detection device formed of an elastic material to absorb vibrations of the hammer and the elastic body. Claim 8 In claim 5, the above controller is a defect detection device that determines a measured component to be defective if a peak value is not detected in the peak-in region of the frequency response function. Claim 9 In claim 5, the above controller is a defect detection device that determines a measured component to be defective when a peak value is detected in the peak-out region of the frequency response function. Claim 10 delete Claim 11 delete

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