A surface profile detection method and detection device for a precision forged housing of a shock absorber

Abstract

The present application relates to a surface contour detection method and detection device for a precision forged shell of a shock absorber. The detection device includes an upper base plate, a lower base plate, a support column, a cylinder, a pull rod, a DE reference seat, a K reference seat, an XY axis reference seat, a Z axis reference seat, an XY detector and a Z axis detector. The DE reference seat is used to fix the precision forged shell of the shock absorber, and the K reference seat is used to abut against the mounting reference surface K of the precision forged shell of the shock absorber. The present application converts the detection of the deviation between the axis of the first cavity and the second cavity into the detection of the surface contour. The DE reference seat and the K reference seat are used to accurately fix the precision forged shell of the shock absorber at the detection position, and perform high-precision direct detection, which is more efficient. The present application can use visual detection equipment for detection, which can effectively improve the detection speed and accuracy of online detection at the production site, prevent misjudgment caused by human eye fatigue, improve production and quality, and reduce the labor intensity of workers.

Description

Technical Field

[0001] The present application relates to the technical field of detection and measurement of new energy vehicle parts, and in particular to a surface profile detection method and a detection device for a precision forged shell of a shock absorber. Background Art

[0002] With the increasing popularity of new energy vehicles, safety issues have gradually become the focus of public attention. Although new energy vehicles are known for their low energy consumption, environmental protection performance and high efficiency, safety configuration cannot be ignored. Among them, the shock absorber system (also known as shock absorber) plays a vital role in driving stability and safety. Common types of shock absorbers include hydraulic shock absorbers and pneumatic shock absorbers. Their principles are to suppress the rebound force of the spring after compression through the damping process, so that the vehicle tires maintain close contact with the road surface, thereby effectively isolating and absorbing road vibrations. For new energy vehicles, since the body weight is usually heavier than that of the same level of fuel vehicles and contains a large number of highly integrated electronic components, the performance requirements for shock absorbers are also higher. Excellent shock absorbers can significantly reduce body bumps, reduce the risk of damage to batteries and electronic components, and thus extend the service life of the vehicle.

[0003] There is an air shock absorber that adopts a multi-tube design. In order to have higher strength, the corresponding shock absorber shell is generally manufactured by a metal precision forging process. Usually, the shape of the shock absorber precision forging shell includes a first cavity and a second cavity. The axes of the first cavity and the second cavity are skew lines, and a positioning step is provided in the second cavity.

[0004] During operation, the air shock absorber needs to maintain good air tightness, so the manufacturing accuracy of the precision forged shock absorber shell is also required to be high. The more important dimensional data include the deviation between the axes of the first cavity and the second cavity, which also determines the subsequent assembly accuracy. Since only the lower end face of the first cavity is open, and both upper and lower end faces of the second cavity are open, and there is a positioning step, it is impossible to use the same processing reference to complete all machining of the precision forged shock absorber shell at one time. Generally, it is divided into two processing steps. First, the first cavity is processed, including processing the placement reference, the installation reference and shaping the first cavity. Then the second cavity is processed, including processing the placement reference and shaping the second cavity. Since the references of the two processing are different, there will be a deviation between the axes of the first cavity and the second cavity. Since the two axes are skew lines, it is difficult to measure directly with the existing technology, and a more expensive contour meter is required. The detection efficiency is not high and needs to be improved. Summary of the invention

[0005] In order to solve the technical problems that the deviation between the axes of the first cavity and the second cavity of the precision forged shell of the shock absorber is difficult to detect and the detection efficiency is low, the present invention provides a surface contour detection method and detection device for the precision forged shell of the shock absorber.

[0006] The technical solution provided by the present application is as follows: a method for detecting the surface profile of a precision forged housing of a shock absorber, wherein the precision forged housing of the shock absorber comprises a first cavity and a second cavity, the axes of the first cavity and the second cavity are skew lines, and a positioning step is provided in the second cavity, comprising the following steps:

[0007] S1, taking the bottom plane of the first cavity as the horizontal reference plane and the outer wall plane of the first cavity as the vertical reference plane, a mounting reference plane K is machined at the lower part of the side surface of the precision forged shell of the shock absorber, and a surface contour detection cut is simultaneously machined at the middle part of the side surface of the precision forged shell of the shock absorber, wherein the surface contour detection cut includes an X-axis detection edge, a Y-axis detection edge and a Z-axis detection plane;

[0008] S2, using the top plane of the second cavity as the horizontal reference plane and the outer cylindrical surface of the second cavity as the vertical reference plane, a reference plane D is machined on the lower surface of the positioning step, and an inner cylindrical reference surface E is simultaneously machined on the inner wall of the second cavity;

[0009] S3, setting a DE reference seat, placing the shock absorber precision forging housing on the DE reference seat, so that the inner cylindrical reference surface E of the second cavity fits with the DE reference seat, and the top of the DE reference seat abuts against the lower surface of the positioning step;

[0010] S4, set the K reference seat, rotate the precision forged housing of the shock absorber, and make the installation reference surface K fit the side of the K reference seat;

[0011] S5, setting an XY axis reference seat, and setting an XY detector on the XY axis reference seat to detect the X axis detection edge and the Y axis detection edge;

[0012] S6, setting a Z-axis reference seat, and setting a Z-axis detector on the Z-axis reference seat to detect the Z-axis detection plane.

[0013] By adopting the above technical scheme, the present application converts the detection of the deviation between the axes of the first cavity and the second cavity into the detection of the surface contour. First, when processing the first cavity, the installation reference surface K and the surface contour detection cutout are processed. The size of the surface contour detection cutout should be correlated and theoretically correspond to the size to be detected in the second cavity; since the installation reference surface K and the surface contour detection cutout are processed by the same processing reference, the processing accuracy mainly depends on the accuracy of the processing equipment, and the accuracy of the processing equipment (CNC milling machine or machining center) in the prior art is already very high, so at this time, based on the processing reference of the first cavity, the size of the surface contour detection cutout is basically consistent with the design size; when based on the processing reference of the second cavity, the size of the surface contour detection cutout will deviate from the design size, and this deviation is the processing deviation between the axes of the first cavity and the second cavity, which needs to be controlled within a certain range. The present application utilizes a DE reference seat to first basically fix the precision forged shell of the shock absorber, and then utilizes a K reference seat to completely fix the precision forged shell of the shock absorber at the detection position, and then utilizes an XY detector to detect the X-axis detection edge and the Y-axis detection edge, and a Z-axis detector to detect the Z-axis detection plane. Since the detection can be performed directly, there is no need to use a more expensive profilometer, and the detection efficiency is also higher.

[0014] Preferably, the XY detector and the Z-axis detector are visual inspection devices; or the XY detector is an XY go gauge and an XY no-go gauge, and the Z-axis detector is a Z-axis go and no-go gauge.

[0015] Preferably, the X-axis detection edge is parallel to the design size of the top plane of the second cavity; the Y-axis detection edge is parallel to the design size of the central axis of the second cavity; and the Z-axis detection plane is parallel to the design size of the central axis of the second cavity.

[0016] Another technical solution provided by the present application is as follows: a detection device for realizing the surface profile detection method of the precision forged housing of the shock absorber described above, comprising an upper base plate, a lower base plate, a plurality of support columns, a cylinder, a pull rod, a DE reference seat, a K reference seat, an XY axis reference seat, a Z axis reference seat, an XY detector and a Z axis detector;

[0017] The upper base plate and the lower base plate are arranged in parallel up and down and supported by a plurality of support columns. The DE reference seat, the K reference seat, the XY axis reference seat and the Z axis reference seat are all fixedly arranged on the upper base plate; the K reference seat is used to abut against the mounting reference surface K of the precision forged housing of the shock absorber, the XY detector is arranged on the XY axis reference seat, and the Z axis detector is arranged on the Z axis reference seat;

[0018] The upper part of the DE reference seat is an elastic cylindrical chuck, and the DE reference seat is provided with a central axis hole. The cylinder is fixedly set on the upper base plate or the lower base plate, and the pull rod is set on the cylinder axis of the cylinder. The pull rod passes through the upper base plate upward and enters the central axis hole of the DE reference seat. The top of the pull rod is also provided with an inverted cone head. The cylinder is used to pull the pull rod downward, and the inverted cone head of the pull rod is embedded in the central axis hole of the DE reference seat to prop up the elastic cylindrical chuck so that the outer wall of the elastic cylindrical chuck is tightly pressed against the inner cylindrical reference surface E.

[0019] By adopting the above technical scheme, at the production site of the precision forged housing of the shock absorber or similar structural parts, the surface profile of the parts can be detected online through the detection device, so as to ensure the rapid judgment of the quality status of the parts during trial production and initial production. To ensure the accuracy and reliability of the detection, the parts need to be accurately installed on the detection device first, and then the holes, cavities, reference surfaces, and connection positions between parts of different properties on the parts can be detected with the help of detectors (check pins, go and no-go gauges, calipers, micrometers, and even visual inspection), and even visual inspection. The DE reference seat is set in this application, and the upper part is an elastic cylindrical chuck. The top of the elastic cylindrical chuck abuts against the lower surface of the positioning step. After the elastic cylindrical chuck expands, it fits with the inner cylindrical reference surface E of the second cavity, and the precision forged housing of the shock absorber is fixed very firmly. Then, the installation reference surface K is used to locate the angle in the horizontal direction. The overall position accuracy is extremely high, which can naturally improve the accuracy and reliability of the detection.

[0020] Preferably, the detection device also includes a quick clamp, a quick clamp pad and a pressure plate, the quick clamp pad is fixedly arranged on the upper base plate, and the quick clamp is fixedly arranged on the quick clamp pad, and is used to press the pressure plate against the top of the second cavity of the precision forged housing of the shock absorber.

[0021] Preferably, a lifting and rotating cylinder is further provided on the upper base plate, a pressure plate is provided on the swing arm of the lifting and rotating cylinder, and the lifting and rotating cylinder is used to drive the pressure plate to press the top of the second cavity of the precision forged shell of the shock absorber.

[0022] Preferably, the top of the central axis hole of the DE reference seat is provided with a chamfer matched with the inverted cone head of the pull rod.

[0023] Preferably, a cylindrical extension section is further provided at the top of the inverted cone-shaped head of the pull rod, and a straight groove is provided in the middle of the cylindrical extension section.

[0024] Preferably, the XY detector is an XY go gauge and an XY no-go gauge, the Z-axis detector is a Z-axis go and no-go gauge, the XY-axis reference seat is provided with a first guide hole, the XY go gauge and the XY no-go gauge can slide axially in the first guide hole, the Z-axis reference seat is provided with a second guide hole, the Z-axis go and no-go gauge can slide axially in the second guide hole.

[0025] Preferably, the XY go gauge is provided with an X-direction through edge and a Y-direction through edge; the XY stop gauge is provided with an X-direction stop edge and a Y-direction stop edge; and the Z-axis go and stop gauge is provided with a Z-axis through surface and a Z-axis stop surface.

[0026] In summary, the present application includes at least one of the following beneficial technical effects:

[0027] The present application converts the detection of the deviation between the axes of the first cavity and the second cavity into the detection of the surface profile. Since the detection can be performed directly, there is no need to use an expensive profilometer, and the detection efficiency is higher.

[0028] The surface contour detection cut includes an X-axis detection edge, a Y-axis detection edge and a Z-axis detection plane. By detecting the dimensions of the three aspects of the surface contour detection cut, the deviation between the axes of the first cavity and the second cavity is indirectly detected, which is more comprehensive and accurate.

[0029] At the production site of precision forged shock absorber housings or similar structural parts, the surface profile of the parts can be detected online through the detection device, so as to ensure the rapid judgment of the quality status of the parts during trial production and start-up production;

[0030] The XY detector and Z-axis detector of the present application can adopt visual inspection equipment, and use industrial cameras instead of human eyes to complete functions such as recognition, measurement, and positioning. It can effectively improve the detection speed and accuracy of online detection at the production site, prevent misjudgment due to eye fatigue, improve output and quality, and reduce the labor intensity of workers. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A three-dimensional diagram of the precision forged housing of the shock absorber described in the present application is depicted;

[0032] Figure 2 A three-dimensional view of the precision forged housing of the shock absorber described in the present application is shown at another angle;

[0033] Figure 3 A front view of the precision forged housing of the shock absorber described in the present application is depicted;

[0034] Figure 4 Draws Figure 3 Enlarged view of point A in the middle;

[0035] Figure 5 A three-dimensional diagram of the precision forged housing of the shock absorber described in the present application is depicted;

[0036] Figure 6 A three-dimensional diagram of a surface profile detection device for a precision forged housing of a shock absorber according to the first embodiment of the present application is depicted;

[0037] Figure 7A three-dimensional diagram of another angle of the surface profile detection device of the precision forged shell of the shock absorber described in the first embodiment of the present application is depicted;

[0038] Figure 8 A top view of a surface profile detection device for a precision forged housing of a shock absorber according to the first embodiment of the present application is depicted;

[0039] Fig. 9 A schematic diagram of the state after the precision forged housing of the shock absorber is placed on the surface contour detection device according to the first embodiment of the present application is depicted;

[0040] Fig.10 A top view of the precision forged housing of the shock absorber after being placed on the surface contour detection device according to the first embodiment of the present application is depicted;

[0041] Fig.11 Draws Fig.10 Sectional view at the middle BB;

[0042] Fig.12 A three-dimensional diagram of another angle of the surface profile detection device of the precision forged shell of the shock absorber described in the first embodiment of the present application is depicted;

[0043] Fig.13 A three-dimensional diagram of a DE reference seat in a surface profile detection device for a precision forged housing of a shock absorber described in Example 1 of the present application is depicted;

[0044] Fig.14 A three-dimensional diagram of a K reference seat in a surface profile detection device for a precision forged housing of a shock absorber according to the first embodiment of the present application is depicted;

[0045] Fig.15 A three-dimensional diagram of an XY go gauge in a surface profile detection device for a precision forged housing of a shock absorber according to the first embodiment of the present application is depicted;

[0046] Fig.16 An end view of an XY go gauge in a surface profile detection device for a precision forged housing of a shock absorber according to the first embodiment of the present application is depicted;

[0047] Fig.17 A three-dimensional diagram of an XY stop gauge in a surface profile detection device for a precision forged housing of a shock absorber according to the first embodiment of the present application is depicted;

[0048] Fig.18 An end view of an XY stop gauge in a surface profile detection device for a precision forged housing of a shock absorber according to the first embodiment of the present application is depicted;

[0049] Fig.19 A three-dimensional diagram of a Z-axis go / no-go gauge in a surface profile detection device for a precision forged housing of a shock absorber according to the first embodiment of the present application is depicted;

[0050] Fig. 20A three-dimensional diagram of a pull rod in a surface profile detection device for a precision forged housing of a shock absorber according to the first embodiment of the present application is depicted;

[0051] Fig.21 Draws Fig. 20 Enlarged view of point C in the middle;

[0052] Fig. 22 A three-dimensional diagram of a surface profile detection device for a precision forged housing of a shock absorber according to a second embodiment of the present application is depicted;

[0053] Fig.23 A schematic diagram of the state after the precision forged shell of the shock absorber is placed on the surface contour detection device according to the second embodiment of the present application is depicted.

[0054] Description of reference numerals: 1, upper base plate; 2, lower base plate; 3, support column; 4, cylinder; 5, pull rod; 51, inverted cone head; 52, cylindrical extension section; 53, slotted; 6, DE reference seat; 61, elastic cylindrical chuck; 62, center axis hole; 63, chamfer; 7, K reference seat; 8, XY axis reference seat; 81, first guide hole; 9, Z axis reference seat; 91, second guide hole; 10, XY pass gauge; 10A, X-direction through edge; 10B, Y-direction through edge; 11, XY stop gauge; 11A, X-direction stop edge; 11B, Y-direction stop edge; 12. Z-axis go / no-go gauge; 12A. Z-axis through surface; 12B. Z-axis stop surface; 13. Quick clamp; 14. Quick clamp pad; 15. Pressing plate; 16. Lifting and rotating cylinder; 161. Swing arm; 100. Precision forged housing of shock absorber; 101. First cavity; 102. Second cavity; 103. Positioning step; 104. Surface contour detection cutout; 1041. X-axis detection edge; 1042. Y-axis detection edge; 1043. Z-axis detection plane; 105. Installation reference plane K; 106. Reference plane D; 107. Inner cylindrical reference plane E. DETAILED DESCRIPTION

[0055] The following is combined with Figures 1 to 23 This application is described in further detail.

[0056] Reference Figures 1 to 5 , is the object to be detected by the present application, specifically a precision forged shock absorber housing 100, the precision forged shock absorber housing 100 comprises a first cavity 101 and a second cavity 102, the axes of the first cavity 101 and the second cavity 102 are skew lines, and a positioning step 103 is provided in the second cavity 102. Figure 2 As shown, the first cavity 101 is sealed at the upper end and open at the lower end; Figure 5 As shown, the second cavity 102 is open at both the upper and lower ends.

[0057] The embodiment of the present application discloses a surface profile detection method of a precision forged housing 100 of a shock absorber, comprising the following steps:

[0058] S1, the bottom plane of the first cavity 101 is taken as the horizontal reference plane, and the outer wall plane of the first cavity 101 is taken as the vertical reference plane ( Figure 1 ), a mounting reference surface K105 is machined on the lower part of the side of the shock absorber precision forging housing 100, and a surface contour detection cutout 104 is simultaneously machined on the middle part of the side of the shock absorber precision forging housing 100, and the surface contour detection cutout 104 includes an X-axis detection edge 1041, a Y-axis detection edge 1042 and a Z-axis detection plane 1043;

[0059] S2, taking the top plane of the second cavity 102 as the horizontal reference plane and the outer cylindrical surface of the second cavity 102 as the vertical reference plane, a reference plane D106 is machined on the lower surface of the positioning step 103, and an inner cylindrical reference surface E107 is simultaneously machined on the inner wall of the second cavity 102;

[0060] S3, setting the DE reference seat 6, placing the shock absorber precision forging housing 100 on the DE reference seat 6, so that the inner cylindrical reference surface E107 of the second cavity 102 fits with the DE reference seat 6, and the top of the DE reference seat 6 abuts against the lower surface of the positioning step 103;

[0061] S4, setting the K reference seat 7, rotating the shock absorber precision forging housing 100, so that the installation reference surface K105 is in contact with the side surface of the K reference seat 7;

[0062] S5, setting an XY axis reference base 8, and setting an XY detector on the XY axis reference base 8 to detect the X axis detection edge 1041 and the Y axis detection edge 1042;

[0063] S6, setting a Z-axis reference seat 9, and setting a Z-axis detector on the Z-axis reference seat 9 to detect the Z-axis detection plane 1043.

[0064] The present application converts the detection of the deviation between the axes of the first cavity 101 and the second cavity 102 into the detection of the surface contour, so the processed surface contour detection cutout 104 must be associated with the axis size of the second cavity 102. Figure 3 and Figure 4As shown, the face contour detection cutout 104 includes an X-axis detection edge 1041, a Y-axis detection edge 1042, and a Z-axis detection plane 1043. The specific dimensions are as follows: the X-axis detection edge 1041 is parallel to the design dimension of the top plane of the second cavity 102; the Y-axis detection edge 1042 is parallel to the design dimension of the central axis of the second cavity 102; and the Z-axis detection plane 1043 is parallel to the design dimension of the central axis of the second cavity 102. By detecting the dimensions of the three aspects of the face contour detection cutout 104, the deviation between the axes of the first cavity 101 and the second cavity 102 is indirectly detected, which is more comprehensive and accurate.

[0065] Reference Figures 6 to 21 , as an embodiment of the detection device for realizing the surface profile detection method of the precision forged shell 100 of the shock absorber described above, it includes an upper base plate 1, a lower base plate 2, a plurality of support columns 3, a cylinder 4, a pull rod 5, a DE reference seat 6, a K reference seat 7, an XY axis reference seat 8, a Z axis reference seat 9, an XY detector and a Z axis detector.

[0066] The upper base plate 1 and the lower base plate 2 are arranged in parallel up and down and supported by a plurality of support columns 3. The DE reference seat 6, K reference seat 7, XY axis reference seat 8 and Z axis reference seat 9 are all fixedly set on the upper base plate 1; the K reference seat 7 is used to abut against the mounting reference surface K105 of the precision forged housing 100 of the shock absorber, the XY detector is set on the XY axis reference seat 8, and the Z axis detector is set on the Z axis reference seat 9.

[0067] like Figure 8 and Fig.12 As shown, a plurality of fixing holes are processed on the upper substrate 1, which are respectively used for the DE reference seat 6, the K reference seat 7, the XY axis reference seat 8 and the Z axis reference seat 9. The processing shape and position accuracy of the fixing holes are required to be high in order to ensure the position accuracy of the DE reference seat 6, the K reference seat 7, the XY axis reference seat 8 and the Z axis reference seat 9 after installation.

[0068] The upper part of the DE reference seat 6 is an elastic cylindrical chuck 61, and a central axis hole 62 is provided on the DE reference seat 6. The cylinder 4 is fixedly set on the upper base plate 1 or the lower base plate 2, and the pull rod 5 is set on the cylinder axis of the cylinder 4. The pull rod 5 passes through the upper base plate 1 upward and enters the central axis hole 62 of the DE reference seat 6. The top of the pull rod 5 is also provided with an inverted cone head 51. The cylinder 4 is used to pull the pull rod 5 downward, and the inverted cone head 51 of the pull rod 5 is embedded in the central axis hole 62 of the DE reference seat 6 to open the elastic cylindrical chuck 61 so that the outer wall of the elastic cylindrical chuck 61 is tightly pressed against the inner cylindrical reference surface E107.

[0069] In this embodiment, refer to Figure 6 and Figure 7, the XY detector is an XY go gauge 10 and an XY stop gauge 11, and the Z-axis detector is a Z-axis go and stop gauge 12. The go and stop gauge is a type of gauge, and is more advantageous when used for large-scale inspection of products; of course, calipers, micrometers and other graduated measuring tools can also be used, but measuring products one by one is time-consuming and labor-intensive, and the efficiency is low. In this application, the XY detector and the Z-axis detector can also use visual inspection equipment, using industrial cameras instead of human eyes to complete functions such as identification, measurement, and positioning, which can effectively improve the detection speed and accuracy of online detection at the production site, prevent misjudgment caused by human eye fatigue, improve production and quality, and reduce the labor intensity of workers.

[0070] Reference Fig.12 The XY axis reference seat 8 is provided with a first guide hole 81, and the XY go gauge 10 and the XY stop gauge 11 can slide axially in the first guide hole 81. The Z axis reference seat 9 is provided with a second guide hole 91, and the Z axis go and stop gauge 12 can slide axially in the second guide hole 91. Fig.15 and Fig.16 The XY pass gauge 10 is provided with an X-direction pass edge 10A and a Y-direction pass edge 10B; Fig.17 and Fig.18 The XY stop gauge 11 is provided with an X-direction stop edge 11A and a Y-direction stop edge 11B; Fig.19 The Z-axis go / no-go gauge 12 is provided with a Z-axis through surface 12A and a Z-axis stop surface 12B. The XY-axis reference seat 8 is used to ensure that the XY go / no-go gauge 10 and the XY stop gauge 11 have accurate movement directions, and the Z-axis reference seat 9 is used to ensure that the Z-axis go / no-go gauge 12 has accurate movement directions and is not affected by human factors, thereby ensuring the reliability of the detection results.

[0071] Reference Fig. 9 , Fig.10 and Fig.11 The surface contour detection device also includes a quick clamp 13, a quick clamp 13 pad and a pressure plate 15. The quick clamp 13 pad is fixedly arranged on the upper base plate 1, and the quick clamp 13 is fixedly arranged on the quick clamp 13 pad, which is used to press the pressure plate 15 on the top of the second cavity 102 of the shock absorber precision forging shell 100. Since the shape of the shock absorber precision forging shell 100 is relatively complex and the center of gravity is relatively large, when it is directly placed on the DE reference seat 6, the shock absorber precision forging shell 100 will tilt under the action of gravity, so the present application is provided with a quick clamp 13 and a pressure plate 15. The pressure plate 15 is a planar structure, which can fit with the top of the second cavity 102 of the shock absorber precision forging shell 100. The shock absorber precision forging shell 100 is pressed by the quick clamp 13, so that the upper surface of the DE reference seat 6 can be completely fitted with the reference plane D106 of the lower surface of the positioning step 103, so that the shock absorber precision forging shell 100 is in an accurate detection position.

[0072] In this embodiment, refer to Fig.13 The top of the central axis hole 62 of the DE reference seat 6 is provided with a chamfer 63 adapted to the inverted cone head 51 of the pull rod 5, which can improve the force conditions and reduce the friction between the two, so that it is easier to expand the elastic cylindrical chuck 61 on the top of the DE reference seat 6 and reduce the tension requirement on the cylinder 4. Fig. 20 and Fig.21 A cylindrical extension section 52 is also provided at the top of the inverted cone head 51 of the pull rod 5. The cylindrical extension section 52 has a large surface area, is more wear-resistant, has a long service life, is dimensionally stable, and avoids frequent replacement; a straight groove 53 is provided in the middle of the cylindrical extension section 52 to slightly weaken the rigidity of the cylindrical extension section 52, which can not only further reduce wear, but also will not affect the expansion degree of the elastic cylindrical chuck 61.

[0073] The present application converts the detection of the deviation between the axes of the first cavity 101 and the second cavity 102 into the detection of the surface contour. First, when processing the first cavity 101, the installation reference surface K105 and the surface contour detection cutout 104 are processed. The size of the surface contour detection cutout 104 should be associated with and theoretically correspond to the size of the second cavity 102 to be detected. Since the installation reference surface K105 and the surface contour detection cutout 104 are processed by the same processing reference, the processing accuracy mainly depends on the accuracy of the processing equipment, and the accuracy of the processing equipment (CNC milling machine or machining center) in the prior art is already very high. Therefore, at this time, based on the processing reference of the first cavity 101, the size of the surface contour detection cutout 104 is basically consistent with the design size; when based on the processing reference of the second cavity 102, the size of the surface contour detection cutout 104 will deviate from the design size. This deviation is the processing deviation between the axes of the first cavity 101 and the second cavity 102, which needs to be controlled within a certain range. The present application utilizes the DE reference seat 6 to first basically fix the shock absorber precision forged shell 100, and then utilizes the K reference seat 7 to completely fix the shock absorber precision forged shell 100 at the detection position, and then utilizes the XY detector to detect the X-axis detection edge 1041 and the Y-axis detection edge 1042, and the Z-axis detector to detect the Z-axis detection plane 1043. Since the detection can be performed directly, there is no need to use a more expensive profilometer, and the detection efficiency is also higher.

[0074] At the production site of the precision forged housing 100 of the shock absorber or similar structural parts, the surface profile of the parts is detected online through the detection device, so as to ensure the rapid judgment of the quality status of the parts during trial production and initial production. To ensure the accuracy and reliability of the surface profile detection, the parts need to be accurately installed on the detection device first, and then the holes, cavities, reference surfaces, connection positions between parts and other aspects of the parts with different properties can be detected with the help of detectors (check pins, go and no-go gauges, calipers, micrometers, and even visual inspection). The DE reference seat 6 is set in this application, and the upper part thereof is an elastic cylindrical chuck 61. The top of the elastic cylindrical chuck 61 abuts against the lower surface of the positioning step 103. After the elastic cylindrical chuck 61 expands, it fits with the inner cylindrical reference surface E of the second cavity 102, and the precision forged housing 100 of the shock absorber is fixed very firmly. Then, the installation reference surface K is used to locate the angle in the horizontal direction. The overall position accuracy is extremely high, which can naturally improve the accuracy and reliability of the detection.

[0075] Reference Fig. 22 and Fig.23 As a second embodiment of the detection device for realizing the surface contour detection method of the precision forged shell 100 of the shock absorber described above, the difference from the first embodiment is that a lifting and rotating cylinder 16 is also provided on the upper base plate 1, and a pressure plate 15 is provided on the swing arm 161 of the lifting and rotating cylinder 16. The lifting and rotating cylinder 16 is used to drive the pressure plate 15 to press the top of the second cavity 102 of the precision forged shell 100 of the shock absorber. The quick clamp requires manpower to operate, and the precision forged shell 100 of the shock absorber has a large mass, and it is relatively laborious to operate the quick clamp. Since the products are all tested in batches, the inspectors are prone to fatigue. The present application adopts a lifting and rotating cylinder 16. When raised, the swing arm 161 drives the pressure plate 15 to rotate 90 degrees outward (or other angles) to make room without affecting the free placement of the precision forged shell 100 of the shock absorber. When dropped, the swing arm 161 drives the pressure plate 15 to rotate 90 degrees inward and presses the precision forged shell 100 of the shock absorber downward, thereby achieving the purpose of fixing the precision forged shell 100 of the shock absorber and reducing the labor intensity of the inspectors. Other structures and beneficial effects are consistent with those in Example 1 and will not be repeated here.

[0076] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method for detecting the surface profile of a precision forged housing of a shock absorber, wherein the precision forged housing of the shock absorber comprises a first cavity and a second cavity, wherein the axes of the first cavity and the second cavity are skew lines, and a positioning step is provided in the second cavity, wherein: The surface contour detection method comprises the following steps: S1, taking the bottom plane of the first cavity as the horizontal reference plane and the outer wall plane of the first cavity as the vertical reference plane, processing a mounting reference plane K at the lower part of the side surface of the precision forged shell of the shock absorber, and simultaneously processing a surface contour detection cutout at the middle part of the side surface of the precision forged shell of the shock absorber, wherein the surface contour detection cutout includes an X-axis detection edge, a Y-axis detection edge and a Z-axis detection plane; S2, using the top plane of the second cavity as the horizontal reference plane and the outer cylindrical surface of the second cavity as the vertical reference plane, machining a reference plane D on the lower surface of the positioning step, and simultaneously machining an inner cylindrical reference surface E on the inner wall of the second cavity; S3, setting a DE reference seat, placing the shock absorber precision forging housing on the DE reference seat, so that the inner cylindrical reference surface E of the second cavity fits with the DE reference seat, and the top of the DE reference seat abuts against the lower surface of the positioning step; S4, set the K reference seat, rotate the precision forged housing of the shock absorber, and make the installation reference surface K fit the side of the K reference seat; S5, setting an XY axis reference seat, and setting an XY detector on the XY axis reference seat to detect the X axis detection edge and the Y axis detection edge; S6, setting a Z-axis reference seat, and setting a Z-axis detector on the Z-axis reference seat to detect the Z-axis detection plane; The X-axis detection edge is parallel to the design size of the top plane of the second cavity; the Y-axis detection edge is parallel to the design size of the central axis of the second cavity; the Z-axis detection plane is parallel to the design size of the central axis of the second cavity; The XY detector and the Z-axis detector are visual inspection devices; or the XY detector is an XY go gauge and an XY stop gauge, and the Z-axis detector is a Z-axis go and stop gauge.

2. A detection device for realizing the surface profile detection method of the precision forged housing of a shock absorber according to claim 1, characterized in that: It includes an upper base plate, a lower base plate, a plurality of support columns, a cylinder, a pull rod, a DE reference seat, a K reference seat, an XY axis reference seat, a Z axis reference seat, an XY detector and a Z axis detector; The upper base plate and the lower base plate are arranged in parallel up and down and supported by a plurality of support columns. The DE reference seat, the K reference seat, the XY axis reference seat and the Z axis reference seat are all fixedly arranged on the upper base plate; the K reference seat is used to abut against the mounting reference surface K of the precision forged housing of the shock absorber, the XY detector is arranged on the XY axis reference seat, and the Z axis detector is arranged on the Z axis reference seat; The upper part of the DE reference seat is an elastic cylindrical chuck, and the DE reference seat is provided with a central axis hole. The cylinder is fixedly set on the upper base plate or the lower base plate, and the pull rod is set on the cylinder axis of the cylinder. The pull rod passes through the upper base plate upward and enters the central axis hole of the DE reference seat. The top of the pull rod is also provided with an inverted cone head. The cylinder is used to pull the pull rod downward, and the inverted cone head of the pull rod is embedded in the central axis hole of the DE reference seat to prop up the elastic cylindrical chuck so that the outer wall of the elastic cylindrical chuck is tightly pressed against the inner cylindrical reference surface E.

3. The detection device according to claim 2, characterized in that: It also includes a quick clamp, a quick clamp pad and a pressure plate. The quick clamp pad is fixedly arranged on the upper base plate, and the quick clamp is fixedly arranged on the quick clamp pad, and is used to press the pressure plate on the top of the second cavity of the precision forging of the shock absorber.

4. The detection device according to claim 2, characterized in that: The upper base plate is also provided with a lifting and rotating cylinder, and a pressure plate is provided on the swing arm of the lifting and rotating cylinder. The lifting and rotating cylinder is used to drive the pressure plate to press the top of the second cavity of the shock absorber for precision forging.

5. The detection device according to claim 2, characterized in that: The top of the central axis hole of the DE reference seat is provided with a chamfer matched with the inverted cone head of the pull rod.

6. The detection device according to claim 5, characterized in that: A cylindrical extension section is also provided at the top of the inverted cone-shaped head of the pull rod, and a straight groove is provided in the middle of the cylindrical extension section.

7. The detection device according to claim 2, characterized in that: The XY detector is an XY go gauge and an XY no-go gauge, the Z-axis detector is a Z-axis go and no-go gauge, the XY-axis reference seat is provided with a first guide hole, the XY go gauge and the XY no-go gauge can slide axially in the first guide hole, the Z-axis reference seat is provided with a second guide hole, the Z-axis go and no-go gauge can slide axially in the second guide hole.

8. The detection device according to claim 7, characterized in that: The XY go gauge is provided with an X-direction through edge and a Y-direction through edge; the XY stop gauge is provided with an X-direction stop edge and a Y-direction stop edge; the Z-axis go and stop gauge is provided with a Z-axis through surface and a Z-axis stop surface.

Images