Part surface defect detection device and use method thereof

Abstract

The invention discloses a part surface defect detection device and a use method thereof. Belongs to the technical field of part detection. The part surface defect detection device comprises a support, a measuring piece and a supporting rod, the support is provided with a plurality of mounting through holes with parallel axes, the measuring piece comprises a measuring rod and a measuring instrument which are in transmission connection, the measuring instrument is detachably mounted in the mounting through hole, the measuring rod movably penetrates through the mounting through hole provided with the measuring instrument, and the supporting rod is connected with the measuring rod. The supporting rod is detachably installed in the installation through hole. According to the part surface defect detection device disclosed by the embodiment of the invention, the measurement range of the part surface defect detection device can be expanded by adjusting the positions of the measuring piece and the supporting rod, and meanwhile, the part surface defect detection device is simple in structure, small in occupied space and flexible and convenient to use.

Description

Technical Field

[0001] The present invention relates to the technical field of parts detection, and in particular to a device for detecting surface defects of parts and a method for using the device. Background Art

[0002] When inspecting the appearance of a vehicle, the surface quality of the exterior panels is usually strictly inspected. Currently, most surface defect inspections on the market use three-dimensional coordinate measuring machines or Atos optical scanning. Most of these inspection devices are large-scale inspection equipment that can conduct comprehensive and detailed inspections of exterior panels.

[0003] However, existing surface defect detection relies too much on large-scale equipment, which is limited when it comes to quickly outputting the value of the defect degree, and it is difficult to meet the needs of instant feedback. In addition, the quantification of mold area research and compensation also requires the use of equipment and waiting for the inspection cycle. In actual use, it is very inconvenient, especially in a production environment that requires rapid response and flexible adjustment. Summary of the invention

[0004] The present invention aims to solve at least one of the above-mentioned technical problems in the prior art to a certain extent. To this end, the present invention provides a device for detecting surface defects of parts, which occupies a small space and is flexible and convenient to use.

[0005] The invention also provides a method for using the device for detecting surface defects of parts.

[0006] According to an embodiment of the present invention, a part surface defect detection device includes: a bracket, the bracket has a plurality of mounting through holes with parallel axes; a measuring piece, the measuring piece includes a measuring rod and a measuring instrument connected by a transmission, the measuring instrument is detachably mounted on the mounting through hole, the measuring rod is movably inserted into the mounting through hole on which the measuring instrument is mounted, the measuring rod has a detection end away from the measuring instrument, and the detection end is located outside the bracket; a support rod, the support rod is detachably mounted on the mounting through hole, and the support rod and the measuring instrument are mounted on different mounting through holes, the support rod has a support end, and the support end and the detection end are located outside the same side of the bracket.

[0007] According to the part surface defect detection device of the embodiment of the present invention, the bracket has a plurality of mounting through holes with parallel axes, and the measuring piece and the support rod can be detachably installed in different mounting through holes. The measuring range of the part surface defect detection device can be improved by adjusting the positions of the measuring piece and the support rod. At the same time, the part surface defect detection device has a simple structure, occupies a small space, and is flexible and convenient to use.

[0008] According to some embodiments of the present invention, the number of the support rods is N1, and the number of the mounting through holes is N2, satisfying the relationship: N2>N1≥3.

[0009] According to some embodiments of the present invention, in a projection of the part surface defect detection device onto a plane perpendicular to an axis of the mounting through hole, center points of at least three of the support rods are not collinear.

[0010] According to some embodiments of the present invention, in the projection of the part surface defect detection device on the plane perpendicular to the axis of the mounting through holes, a line connecting the center points of at least two of the mounting through holes is perpendicular to a line connecting the center points of another two of the mounting through holes.

[0011] According to some embodiments of the present invention, the positions of the measuring instrument and the support rod relative to the bracket are adjustable in the axial direction of the mounting through hole.

[0012] According to some embodiments of the present invention, the bracket has a plurality of adjustment holes, and the plurality of adjustment holes correspond one-to-one to and are connected with the plurality of mounting through holes, and each of the adjustment holes is installed with an adjustment member that is threadedly matched therewith, and the adjustment member has an adjustment state and a locking state; in the adjustment state, the adjustment member is separated from the measuring instrument or the supported rod in the mounting through hole; in the locking state, the adjustment member is abutted and fixed to the measuring instrument or the supported rod in the mounting through hole.

[0013] According to some embodiments of the present invention, a protective cover is sandwiched between the measuring instrument and the support rod and the corresponding mounting through hole, the protective cover has an avoidance hole, and the adjustment member is inserted into the avoidance hole in the locked state.

[0014] According to some embodiments of the present invention, the avoidance hole extends along the axial direction of the protective sleeve to the axial end of the protective sleeve and forms an open opening.

[0015] According to some embodiments of the present invention, the bracket is made of aluminum alloy.

[0016] According to another aspect of the present invention, the method for using a part surface defect detection device is the above-mentioned part surface defect detection device, and the method for using the part surface defect detection device includes: installing the measuring piece and the support rod on the bracket; placing the part surface defect detection device on the part to be measured, and making the supporting end and the detection end abut against the part without curvature defects of the part, and returning the measuring instrument to zero; moving the bracket on the part and reading the detection value of the measuring instrument.

[0017] According to the method for using the part surface defect detection device of an embodiment of the present invention, after the measuring piece and the support rod are installed on the bracket, the measuring instrument is calibrated to zero, and then the bracket is moved on the part. The curvature deviation of the part at the curvature defect can be obtained by reading the detection value of the measuring instrument. The use of the part surface defect detection device is flexible and convenient.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of the part being tested;

[0020] Figure 2 is a schematic diagram of another part being measured;

[0021] Figure 3 Schematic diagram of a device for detecting surface defects of parts according to an embodiment of the present invention Figure 1 ;

[0022] Figure 4 Schematic diagram of a device for detecting surface defects of parts according to an embodiment of the present invention Figure 2 ;

[0023] Figure 5 is a top view of a bracket according to an embodiment of the present invention;

[0024] Figure 6 yes Figure 5 Section view at AA;

[0025] Figure 7 is a front view of a protective cover according to an embodiment of the present invention;

[0026] Figure 8 yes Figure 7 Sectional view at BB;

[0027] Fig. 9 Schematic diagram of a part surface defect detection device according to an embodiment of the present invention detecting a part Figure 1 ;

[0028] Fig.10 Schematic diagram of a part surface defect detection device according to an embodiment of the present invention detecting a part Figure 2 ;

[0029] Fig.11 yes Fig.10 Sectional view at CC;

[0030] Fig.12 yes Fig.11 Enlarged view at D;

[0031] Fig.13 It is a flow chart of a method for using a device for detecting surface defects of parts according to an embodiment of the present invention.

[0032] Reference numerals:

[0033] Bracket 1; mounting through hole 11; adjustment hole 12;

[0034] Measuring member 2; measuring rod 21; detection end 211; measuring instrument 22;

[0035] Support rod 3; support end 31;

[0036] Protective cover 4; avoidance hole 41; open mouth 411;

[0037] Part surface defect detection device 10;

[0038] Part 20; mold 20a; outer cover 20b. DETAILED DESCRIPTION

[0039] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0040] In the description of the present invention, it is necessary to understand that the terms "length", "up", "down", "front", "back", "horizontal", "top", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0041] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0042] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or can communicate with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] Reference Figure 1 and Figure 2 As shown, Figure 1 The part 20 to be tested is a mold 20a of an outer cover 20b. Figure 2 The part 20 to be measured is the outer cover 20b, and the mold 20a is used to make the outer cover 20b. Generally, the defects of the mold 20a will be fed back to the outer cover 20b, affecting the yield of the outer cover 20b. In addition, in the process of manufacturing the outer cover 20b, due to the complexity of the shape of the outer cover 20b and factors such as material stress release and elastic deformation, defects such as waves often appear on the surface of the outer cover 20b, and these defects need to be accurately measured. At present, three-coordinate measuring machines or Atos optical scanners are usually used for the detection and quantification of defective areas. However, this detection method is too dependent on equipment resources, and the length of its detection cycle often depends on the load condition of the equipment, which results in the inability to quickly output the defect value, affecting the overall work efficiency and response speed. Therefore, in response to the demand for more efficient and flexible detection means, an embodiment of the present invention provides a part surface defect detection device 10 to obtain defect values ​​more quickly and improve production efficiency and quality control level.

[0044] The part surface defect detection device 10 according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

[0045] Reference Figure 3-Figure 6 As shown, a part surface defect detection device 10 according to an embodiment of the present invention includes: a bracket 1, a measuring piece 2 and a support rod 3, the bracket 1 has a plurality of mounting through holes 11 with parallel axes, the measuring piece 2 includes a measuring rod 21 and a measuring instrument 22 which are transmission-connected, the measuring instrument 22 is detachably mounted on the mounting through hole 11, the measuring rod 21 is movably arranged in the mounting through hole 11 on which the measuring instrument 22 is mounted, the measuring rod 21 has a detection end 211 away from the measuring instrument 22, the detection end 211 is located outside the bracket 1, the support rod 3 is detachably mounted on the mounting through hole 11, and the support rod 3 and the measuring instrument 22 are mounted on different mounting through holes 11, the support rod 3 has a support end 31, and the support end 31 and the detection end 211 are located outside the same side of the bracket 1.

[0046] Among them, the bracket 1 has a plurality of mounting through holes 11. Since the axes of each mounting through hole 11 are parallel, the measuring rod 21 and the support rod 3 passing through different mounting through holes 11 can be parallel. The supporting end 31 of the support rod 3 and the detecting end 211 of the measuring rod 21 are located outside the same side of the bracket 1. When performing defect detection on the surface of the part 20, the measurement personnel can hold the bracket 1, abut the supporting end 31 and the detecting end 211 against the surface of the part 20 to be measured, and then move the bracket 1 in an area with the same curvature on the surface of the part 20, and keep the supporting end 31 and the detecting end 211 abutting against the surface of the part 20. When the detecting end 211 slides over the defect positions such as protrusions, pits, and wave structures on the surface of the part, the measuring rod 21 will move along the axial direction of the mounting through hole 11, and the measuring instrument 22 connected to the measuring rod 21 can display the movement of the measuring rod 21, thereby realizing the identification and measurement of the defect positions on the surface of the part 20.

[0047] At the same time, the measuring instrument 22 can be detachably mounted on the mounting through hole 11, the measuring rod 21 can be movably inserted into the mounting through hole 11 on which the measuring instrument 22 is mounted, the support rod 3 can be detachably mounted on the mounting through hole 11, and the support rod 3 and the measuring instrument 22 are mounted on different mounting through holes 11. That is to say, the measuring piece 2 and the support rod 3 can both be detachably mounted on different mounting through holes 11. When measuring different positions on the surface of the part 20 to be measured, the position of the measuring piece 2 and the support rod 3 can be adjusted to increase the measuring range of the part surface defect detection device 10.

[0048] For example, Figure 3 and Figure 4 As shown, the measuring piece 2 can be removed from the mounting hole 11 at the middle position of the bracket 1 and assembled to the mounting hole 11 at the end position of the bracket 1, so as to facilitate the measuring piece 2 to measure the edge position of the surface of the part 20 and reduce the projection of the bracket 1 on the part surface outside the part, thereby reducing the risk of interference between the bracket 1 and other devices.

[0049] In the above embodiment, the bracket 1 has a plurality of mounting through holes 11 with parallel axes. The measuring piece 2 and the support rod 3 can be detachably mounted on different mounting through holes 11. The positions of the measuring piece 2 and the support rod 3 can be adjusted to improve the measuring range of the part surface defect detection device 10. At the same time, the part surface defect detection device 10 has a simple structure, occupies a small space, and is flexible and convenient to use.

[0050] In some embodiments of the present invention, the number of support rods 3 is N1, and the number of mounting through holes 11 is N2, satisfying the relationship: N2>N1≥3.

[0051] Specifically, when using the part surface defect detection device 10, the number N1 of support rods 3 and the number N2 of mounting holes 11 need to satisfy the relationship: N2>N1≥3, where N1 and N2 are both integers. The number of support rods 3 is at least 3, which can enable the part surface defect detection device 10 to form multiple contact points with the part 20 being tested, improve the stability of the bracket 1, and facilitate the operation and use of the part surface defect detection device 10. At the same time, the number of mounting holes 11 needs to be greater than the number of support rods 3 to ensure that the support rods 3 and the measuring piece 2 can be installed in the corresponding mounting holes 11, so as to adjust the positions of the support rods 3 and the measuring piece 2.

[0052] In some embodiments of the present invention, in the projection of the device 10 for detecting surface defects of parts on a plane perpendicular to the axis of the mounting through hole 11 , the center points of at least three support rods 3 are not collinear.

[0053] Specifically, when the center points of at least three support rods 3 in the projection of the part surface defect detection device 10 on the plane perpendicular to the axis of the mounting through hole 11 are not collinear, the three support rods 3 in the part surface defect detection device 10 can form a non-collinear three-point support, that is, the three support ends 31 of the three support rods can be located at the three vertices of a triangle. Through the principle of three-point stable system construction, the part surface defect detection device 10 can be kept stable on the part 20 to be tested through the three support rods 3 when in use, so that the detection result is more accurate and reliable.

[0054] In some embodiments of the present invention, in the projection of the part surface defect detection device 10 on the plane perpendicular to the axis of the mounting through holes 11 , the line connecting the center points of at least two mounting through holes 11 is perpendicular to the line connecting the center points of the other two mounting through holes 11 .

[0055] Among them, when the center point line of at least two mounting holes 11 in the projection of the part surface defect detection device 10 on the plane perpendicular to the axis of the mounting holes 11 is perpendicular to the center point line of the other two mounting holes 11, it is convenient to realize non-collinear three-point support of the three support rods 3.

[0056] Specifically, refer to Figure 5As shown, the center points of the two mounting through holes 11 at the left end and the middle position of the bracket 1 are located on the first straight line, and the center points of the other two mounting through holes 11 at the right end of the bracket 1 are located on the second straight line. The first straight line is parallel to the left-right direction, the second straight line is parallel to the front-back direction, and the first straight line is perpendicular to the second straight line. When the part surface defect detection device 10 is in use, three support rods 3 can be used, of which two support rods 3 can be installed in the two mounting through holes 11 at the right end of the bracket 1 one by one, and one of the mounting through holes 11 at the left end and the middle position of the bracket 1 can be installed with another support rod 3, and the other mounting through hole 11 can be used to install the measuring piece 2, so as to quickly realize the non-collinear three-point support of the three support rods 3, and the part surface defect detection device 10 is convenient and quick to use.

[0057] In some embodiments of the present invention, in the projection of the part surface defect detection device 10 on the plane perpendicular to the axis of the mounting through holes 11 , the line connecting the center points of two mounting through holes 11 may pass through the center of the line connecting the center points of the other two mounting through holes 11 .

[0058] Specifically, refer to Figure 5 As shown, the center points of the two mounting through holes 11 at the left end and the middle position of the bracket 1 are connected to the center of the line passing through the other two mounting through holes 11 at the right end of the bracket 1, and the two mounting through holes 11 at the right end of the bracket 1 can be installed with support rods 3, so that the two support rods 3 can symmetrically support the bracket 1 in the front and rear directions, which is beneficial to further improve the stability of the part surface defect detection device 10 during use.

[0059] In some embodiments of the present invention, the positions of the measuring instrument 22 and the support rod 3 relative to the bracket 1 are adjustable in the axial direction of the mounting through hole 11 .

[0060] Specifically, in the axial direction of the mounting through hole 11, the length of the measuring rod 21 extending out of the mounting through hole 11 can be adjusted by adjusting the position of the measuring instrument 22 relative to the bracket 1, and the length of the support rod 31 extending out of the mounting through hole 11 can be adjusted by adjusting the position of the support rod 3 relative to the bracket 1. Therefore, before the part surface defect detection device 10 is used, the position of the measuring instrument 22 and the measuring rod 21 can be adjusted in the axial direction of the mounting through hole 11, so that the detection end 211 of the measuring rod 21 and the support end 31 of each support rod 3 are located on the same plane or curved surface, thereby realizing the calibration and zeroing of the part surface defect detection device 10 to ensure the measurement accuracy of the part surface defect detection device 10.

[0061] In addition, when the surface curvature of the part 20 to be measured is large, the positions of the measuring instrument 22 and the support rod 3 relative to the bracket 1 can be adjusted in the axial direction of the mounting through hole 11, so that the length of the measuring rod 21 and the support rod 3 extending out of the mounting through hole 11 is lengthened, thereby avoiding interference between the end face of the bracket 1 close to the part 20 and the part 20, thereby improving the ease of use of the part surface defect detection device 10.

[0062] In some embodiments of the present invention, reference Figure 3-Figure 6 As shown, the bracket 1 has a plurality of adjustment holes 12, and the plurality of adjustment holes 12 correspond to and are connected with the plurality of mounting through holes 11 one by one. Each adjustment hole 12 is installed with an adjustment member that is threadedly matched therewith, and the adjustment member has an adjustment state and a locking state. In the adjustment state, the adjustment member is separated from the measuring instrument 22 or the support rod 3 in the mounting through hole 11, and in the locking state, the adjustment member is abutted and fixed to the measuring instrument 22 or the support rod 3 in the mounting through hole 11.

[0063] Specifically, the bracket 1 has a plurality of adjustment holes 12, which correspond to and are connected to a plurality of mounting through holes 11 one by one, and the adjustment holes 12 are used to cooperate with the adjustment member to adjust and lock the measuring instrument 22 or the support rod 3. When the adjustment member is separated from the measuring instrument 22 or the support rod 3 in the mounting through hole 11, the measuring instrument 22 and the support rod 3 can be adjusted in the axial direction of the mounting through hole 11 of the bracket 1 or separated from the bracket 1; when the adjustment member is abutted and fixed with the measuring instrument 22 or the support rod 3 in the mounting through hole 11, the measuring instrument 22 and the support rod 3 are fixed in the current adjustment position and cannot move in the axial direction of the mounting through hole 11. Through the cooperation of the adjustment member and the adjustment hole 12, not only the part surface defect detection device 10 can flexibly adjust the position of the support rod 3 and the measuring instrument 22, but also the calibration and zeroing of the device is facilitated, thereby making the part surface defect detection device 10 more convenient to use.

[0064] It should be noted that the adjusting member can be a screw, and the adjusting member can adjust the position of the adjusting member in the adjusting hole 12 by cooperating with the thread of the adjusting hole 12, thereby adjusting and locking the measuring instrument 22 and the support rod 3.

[0065] In other embodiments of the present invention not shown in the figures, the mounting through hole 11 may be a threaded hole, and the measuring instrument 22 and the support rod 3 may be provided with external threads that cooperate with the threads of the mounting through hole 11, so that the measuring instrument 22 and the support rod 3 can be detachably connected to the mounting through hole 11 by rotating the measuring instrument 22 and the support rod 3, and the position of the measuring instrument 22 and the support rod 3 relative to the bracket 1 in the axial direction of the mounting through hole 11 can be adjusted.

[0066] In some embodiments of the present invention, reference Figure 7 and Figure 8 As shown, a protective cover 4 is sandwiched between the measuring instrument 22 and the support rod 3 and the corresponding mounting through hole 11 , and the protective cover 4 has an avoidance hole 41 , and the adjustment member is passed through the avoidance hole 41 in the locked state.

[0067] Specifically, a protective cover 4 is sandwiched between the measuring instrument 22 and the support rod 3 and the corresponding mounting through hole 11. In actual applications, the measuring instrument 22 and the support rod 3 are detachable and adjustable. Frequent adjustment and disassembly in the mounting through hole 11 may cause wear of the mounting through hole 11. Therefore, by arranging the protective cover 4 in the mounting through hole 11, the measuring instrument 22 and the support rod 3 are installed in the corresponding mounting through hole 11 through the corresponding protective cover 4 to reduce the wear of the mounting through hole 11, which is beneficial to improve the service life of the bracket 1. In addition, the protective cover 4 can be replaced regularly, and the replacement of the protective cover 4 is convenient and the maintenance cost is low.

[0068] At the same time, the protective cover 4 has an avoidance hole 41, and the adjustment piece can be inserted into the avoidance hole 41. When the adjustment piece needs to lock and fix the support rod 3, the adjustment piece can pass through the avoidance hole 41 and abut against the support rod 3 to make the protective cover 4 and the support rod 3 clamped by the inner wall of the installation through hole 11 and the adjustment piece to achieve a locked state. When the adjustment piece needs to lock and fix the measuring instrument 22, the adjustment piece can pass through the avoidance hole 41 and abut against the measuring instrument 22 to make the protective cover 4 and the measuring instrument 22 clamped by the inner wall of the installation through hole 11 and the adjustment piece to achieve a locked state.

[0069] In some embodiments of the present invention, reference Figure 7 and Figure 8 As shown, the avoidance hole 41 extends along the axial direction of the protective sleeve 4 to the axial end of the protective sleeve 4 and is formed with an open opening 411 .

[0070] Specifically, the avoidance hole 41 is along the axial direction of the protective sleeve 4 ( Figure 7 and Figure 8 The avoidance hole 41 extends to the axial end of the protective sleeve 4 and is parallelly formed with an open mouth 411. The open mouth 411 can be located at the lower end of the protective sleeve 4. When the protective sleeve 4 needs to be removed, the adjustment member can be adjusted to the adjustment state. At this time, even if a part of the adjustment member is located in the avoidance hole 41, the protective sleeve 4 can be removed from the installation through hole 11 in the opposite direction of the open mouth 411. That is to say, when removing the protective sleeve 4, the protective sleeve 4 can be pushed upward to separate the adjustment member from the open mouth 411 and avoid interference between the protective sleeve 4 and the adjustment member. Similarly, when installing the protective sleeve 4, the adjustment member can enter the avoidance hole 41 from the open mouth 411, and interference between the adjustment member and the protective sleeve 4 can also be avoided. The setting of the open mouth 411 facilitates the installation and removal of the protective sleeve 4.

[0071] In some embodiments of the present invention, the measuring member 2 is a micrometer.

[0072] Specifically, the micrometer can have an accuracy of at least 0.01 mm, has extremely high measurement accuracy, and can measure tiny deformations. In the embodiment of the present invention, the measuring rod 21 of the measuring member 2 is connected by transmission with the measuring instrument 22, and the measuring rod 21 will undergo a tiny displacement when subjected to the pressure of the object being measured. This displacement is amplified by the transmission system and transmitted to the pointer of the measuring instrument 22, and the measurement result is displayed on the measuring instrument 22. By using a micrometer as the measuring instrument 22, tiny deformations can be captured and measured, thereby ensuring the accuracy and reliability of the measurement results of the part surface defect detection device 10.

[0073] In some embodiments of the present invention, the bracket 1 is made of aluminum alloy.

[0074] Specifically, the density of aluminum alloy is much lower than that of traditional materials such as steel. Therefore, compared with brackets made of other materials, the bracket 1 made of aluminum alloy is lighter during installation, disassembly or use by testers, which reduces the labor intensity of testers.

[0075] According to a method for using a part surface defect detection device according to another embodiment of the present invention, the part surface defect detection device is the part surface defect detection device of the above embodiment.

[0076] Reference Fig.13 As shown, the method for using the part surface defect detection device includes:

[0077] Step S1, installing a measuring piece and a support rod on a bracket.

[0078] Among them, the installation position of the measuring piece can be selected according to the position of the part to be measured. For example, when it is necessary to measure the edge position of the part, the measuring instrument of the measuring piece can be installed in the mounting hole at the end of the bracket to ensure that the detection end can contact the edge position of the part. When it is necessary to measure the middle position of the part, the measuring instrument of the measuring piece can be installed in the mounting hole in the middle of the bracket to improve the stability of the part surface defect detection device.

[0079] Step S2, placing the part surface defect detection device on the part to be tested, and making the supporting end and the detection end abut against the part without curvature defects, and returning the measuring instrument to zero.

[0080] Among them, the surface of the part can be polished with an oil stone to make the part reveal the position of the curvature defect. When the supporting end and the detection end are in contact with the part without curvature defect, the measuring instrument is reset to zero. Therefore, when the part with curvature defect is detected, the detection end will move up and down with the curvature defect, and the measuring instrument will display the corresponding detection value, which is the curvature deviation at the curvature defect.

[0081] Step S3, moving the bracket on the part and reading the detection value of the measuring instrument.

[0082] When the bracket moves, the detection end abuts against the curvature defect position of the part, and the curvature deviation at the curvature defect can be quickly obtained by reading the detection value of the measuring instrument.

[0083] According to the method for using the part surface defect detection device of an embodiment of the present invention, after the measuring piece and the support rod are installed on the bracket, the measuring instrument is calibrated to zero, and then the bracket is moved on the part. The curvature deviation of the part at the curvature defect can be obtained by reading the detection value of the measuring instrument. The use of the part surface defect detection device is flexible and convenient.

[0084] In some specific embodiments of the present invention, the measurement of the surface defects of the part 20 using the part surface defect detection device 10 may be performed in the following steps:

[0085] Step S11 , installing three support rods 3 on the bracket 1 .

[0086] Specifically, three support rods 3 are installed in different mounting holes 11, and the support ends 31 of the three support rods 3 are located at the three vertices of a triangle. In addition, the position of each support rod 3 can be adjusted in the axial direction of the mounting hole 11 so that the support end 31 of each support rod 3 is located in the same horizontal plane.

[0087] Step S12: installing the measuring piece 2 on the measuring bracket 1.

[0088] Specifically, the installation position of the measuring piece 2 can be selected according to the position of the part 20 to be measured. For example, when it is necessary to measure the edge position of the part 2, the measuring instrument 22 of the measuring piece 2 can be installed in the mounting hole 11 at the end of the bracket 1 to ensure that the detection end 211 can contact the edge position of the part 2. When it is necessary to measure the middle position of the part 2, the measuring instrument 22 of the measuring piece 2 can be installed in the mounting hole 11 in the middle of the bracket 1 to improve the stability of the part surface defect detection device 10.

[0089] Step S13, calibrate the measuring instrument 22 to zero.

[0090] Specifically, the part surface defect detection device 10 can be placed on a portion of the standard part or the part 20 to be tested without curvature defects by holding the bracket 1, and the detection end 211 and each support end 31 are in contact with the surface of the standard part or the part 20 to be tested, and the value of the measuring instrument 22 is reset to zero.

[0091] Step S14, performing defect detection on the part 20.

[0092] Specifically, refer to Figure 9-12As shown, hold the bracket 1 and keep the support end 31 of the support rod 3 in contact with the defect-free part of the part 20, and start to move the bracket 1 in the direction to be tested to ensure that the measuring instrument 22 can contact the curvature defect surface of the part 20. At this time, the value E read from the measuring instrument 22 is the curvature deviation of the defect, where Fig.12 The deviation value E between the theoretical curvature (the dotted line in Figure 12) and the actual curvature (the surface of the part 20 abutted by the detection end 211) of the part 20 at the curvature defect surface is illustrated. The degree and scope of the defect can be judged according to different defect deviation values, so as to eliminate the defect according to different defect situations.

[0093] It should be noted that the surface of the part 20 can be polished with an oil stone to expose the location of the curvature defect of the part 20, so that the curvature defect can be measured by the part surface defect detection device 10.

[0094] The part surface defect detection device 10 provided by the embodiment of the present invention can use the three-point stable system construction principle and is equipped with a high-precision measuring piece 2, which can solve the problem of rapid measurement of the outer cover mold surface and the surface defects of the workpiece. At the same time, the material of the lightweight equipment is easy to carry. The part surface defect detection device 10 provided by the embodiment of the present invention not only ensures the stability, rapidity and accuracy of the measurement, can accurately output the defect value, but also expands the measurement range and reduces the dependence on conventional measurement equipment.

[0095] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0096] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A device for detecting surface defects of parts, characterized in that: include: A bracket (1), the bracket (1) having a plurality of mounting through holes (11) with axes parallel to each other; A measuring member (2), the measuring member (2) comprising a measuring rod (21) and a measuring instrument (22) which are connected in a transmission manner, the measuring instrument (22) being detachably mounted on the mounting through hole (11), the measuring rod (21) being movably arranged through the mounting through hole (11) on which the measuring instrument (22) is mounted, the measuring rod (21) having a detection end (211) away from the measuring instrument (22), the detection end (211) being located outside the bracket (1); A support rod (3), wherein the support rod (3) is detachably mounted on the mounting through hole (11), and the support rod (3) and the measuring instrument (22) are mounted on different mounting through holes (11), and the support rod (3) has a support end (31), and the support end (31) and the detection end (211) are located outside the same side of the bracket (1).

2. The device for detecting surface defects of parts according to claim 1, characterized in that: The number of the support rods (3) is N1, and the number of the mounting through holes (11) is N2, satisfying the relationship: N2>N1≥3.

3. The part surface defect detection device according to claim 2, characterized in that: In the projection of the part surface defect detection device onto a plane perpendicular to the axis of the mounting through hole (11), the center points of at least three of the support rods (3) are not collinear.

4. The part surface defect detection device according to claim 3, characterized in that: In the projection of the part surface defect detection device onto a plane perpendicular to the axis of the mounting through holes (11), a line connecting the center points of at least two of the mounting through holes (11) is perpendicular to a line connecting the center points of another two of the mounting through holes (11).

5. The part surface defect detection device according to any one of claims 1 to 4, characterized in that: In the axial direction of the mounting through hole (11), the positions of the measuring instrument (22) and the support rod (3) relative to the bracket (1) are adjustable.

6. The device for detecting surface defects of parts according to claim 5, characterized in that: The bracket (1) has a plurality of adjustment holes (12), the plurality of adjustment holes (12) correspond to and are connected to the plurality of mounting through holes (11) one by one, each of the adjustment holes (12) is installed with an adjustment member threadedly matched therewith, and the adjustment member has an adjustment state and a locking state; In the adjustment state, the adjustment member is separated from the measuring instrument (22) or the supporting rod (3) in the mounting through hole (11); In the locked state, the adjusting member is abutted and fixed against the measuring instrument (22) or the supporting rod (3) in the mounting through hole (11).

7. The device for detecting surface defects of parts according to claim 6, characterized in that: A protective cover (4) is sandwiched between the measuring instrument (22) and the support rod (3) and the corresponding mounting through hole (11), the protective cover (4) having an escape hole (41), and the adjusting member is inserted into the escape hole (41) in the locked state.

8. The device for detecting surface defects of parts according to claim 7, characterized in that: The avoidance hole (41) extends along the axial direction of the protective sleeve (4) to the axial end of the protective sleeve (4) and is formed with an open opening (411).

9. The device for detecting surface defects of parts according to claim 1, characterized in that: The bracket (1) is made of aluminum alloy.

10. A method for using a device for detecting surface defects of a part, characterized in that: The part surface defect detection device is a part surface defect detection device according to any one of claims 1 to 9, and the method for using the part surface defect detection device includes: Installing the measuring piece and the supporting rod on the bracket; Placing the part surface defect detection device on the part to be tested, and making the supporting end and the detection end abut against the part without curvature defect, and returning the measuring instrument to zero; The support is moved on the part to read the detection value of the measuring instrument.

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