Segmented Auxiliary Detection Tooling and Detection Method for Cylindrical Bumps

Abstract

A segmented auxiliary detection tooling and detection method for cylindrical bumps. The reference plate and multiple detection plates are arranged on the support beam, such that the symmetry plane in the width direction of the reference plate and the symmetry planes in the width direction of the respective detection plates are on the same straight line, and the upper surfaces of the reference plate and the respective detection plates are on the same horizontal plane. Each support segment in the support beam is installed in segments on the upper surfaces of the reference plate and / or the detection plates. Each detection plate corresponds to the positions of the respective bumps distributed on the outer circumferential surface of the cylinder, such that the detection holes located on the respective detection plates are respectively fitted with the corresponding bumps. Detection lines are provided on the inner profile surfaces of the detection holes; the accuracy of each bump is determined by the coincidence degree between the detection lines and the axial center line or the circumferential center line on the cylindrical bump. The present invention can directly determine the error values of the bump in the axial and circumferential directions by comparing the scales, and the detection of the shape accuracy of the bumps on the cylinder can be achieved with one installation, with simple and convenient operation and high efficiency.

Description

Technical Field

[0001] The present invention relates to the field of machining, and specifically to an auxiliary tooling and usage method for detecting the shape and position of bumps on the outer side of a cylinder. Background Art

[0002] In the machinery industry, bumps on a cylinder are generally fixed to the outside of the product by means of machining, welding, etc. The final projected shape of the bumps is polygonal, and common ones are quadrilateral and hexagonal. The detection of the final shape and position accuracy of the bumps fixed on the outer side of the cylinder generally uses measuring tools such as angle measuring rulers and vernier calipers for individual measurement, which is applicable to the structure where the bumps on the cylinder are arranged in a single row, with a small total number (≤10) and a total length not greater than 1000 mm. When there are more than 2 rows of bumps on the cylinder, the total number is greater than 10 and the total length is greater than 1000 mm, using a vernier caliper for measurement has a large measurement accuracy error and low detection efficiency; while using a large three - coordinate detector and angle measuring instrument has high detection accuracy, but the operation process is complex, the cost is high, and it is restricted by the operation space.

[0003] In the invention disclosed in the publication number CN106289008A, an inspection tooling for the assembly accuracy of external parts of a solid rocket motor shell is disclosed. This tooling is mainly used for the inspection during the welding and assembly process of the external parts of the solid rocket motor shell. Its structural feature is a long - strip thin steel plate. By utilizing the weak rigidity of the thin - plate structure, it can fit with the cylindrical shell to achieve the inspection of the assembled external parts. The detection accuracy of this tooling is low, and it needs to be fixed and held by a special person to complete. It is only applicable to the use during the process of assembling external parts, and the position of the external parts needs to be adjusted and corrected through multiple repeated measurements to meet the design requirements. If the shell itself is not round or irregular, the assembly detection result has a large error.

[0004] In the invention disclosed in the application number 2018115837816, an auxiliary tooling for detecting the shape and position accuracy of external parts of a cylinder body is disclosed. This tooling is an integral type and is used for detecting the shape and position accuracy of the cylinder body. The maximum size of the parts that this tooling can be used for detection is less than 5000 mm. When it is greater than 5000 mm, the detection of the overall structure is extremely difficult, and it is not easy to carry out detection operations and storage. Summary of the Invention

[0005] To overcome the deficiencies in the prior art, such as large detection errors caused by relying on micrometers for individual measurement and being inapplicable to cylinders with an outer dimension greater than 5000 mm, the present invention proposes a segmented auxiliary detection tooling and detection method for cylinder bumps.

[0006] The segmented auxiliary detection tooling for cylindrical bumps proposed by the present invention includes a support beam, a reference plate, a plurality of detection plates and a plurality of fixing plates. Among them: the reference plate and the plurality of detection plates are arranged on the support beam along the length direction of the support beam, and the symmetry plane in the width direction of the reference plate and the symmetry planes in the width direction of the respective detection plates are located on the same straight line, and the upper surfaces of the reference plate and the respective detection plates are on the same horizontal plane. The support beam is formed by end-to-end lapping of a plurality of support segments, and each support segment is segmented and installed on the upper surface of the reference plate and / or the detection plate, and the end faces of adjacent support segments are butted. The positions of the plurality of detection plates respectively correspond to the positions of the respective bumps distributed on the outer circumferential surface of the cylinder, so that the detection holes located on each detection plate can be respectively fitted with the corresponding bumps. The reference plate is fixedly connected to the threaded reference hole at the front end of the cylinder.

[0007] The lower surface of the detection plate is an arc surface, and the radius of the arc surface is the same as the radius of the cylinder to be detected. There is an installation hole for the support beam in the middle of the upper surface of the detection plate, and the support beam is fixed on the upper surface of the detection plate through the fixing screw. Pin holes for positioning pins are distributed on both sides of the fixing screw installation hole. The lower surface of the detection plate is an arc surface. The radius of the arc surface is the same as the radius of the cylinder and fits with the outer circumferential surface of the cylinder. Two rectangular detection holes are distributed on both sides of the detection plate; the peripheral surfaces inside each detection hole are respectively inner surfaces, and the inner surfaces at the two short sides of each detection hole are axial inner surfaces for detecting the shape accuracy of the bump in the axial direction; the inner surfaces at the two long sides of each detection hole are circumferential inner surfaces for detecting the shape accuracy of the bump in the axial direction.

[0008] The lengths of the four inner sides of each detection hole are respectively greater than the lengths of the four sides of the bump. When each detection hole is respectively fitted with the corresponding bump, there is a 10 mm gap between the four side surfaces of each bump and the four inner surfaces of each detection hole, forming a detection space around the peripheral surface of each bump.

[0009] Detection lines are provided on each inner surface. The detection lines are divided into a circumferential center line and an axial center line. Among them, the detection line at the symmetry line in the length direction of each circumferential inner surface is the circumferential center line; the detection line at the symmetry line in the length direction of each axial inner surface is the axial center line. Scale lines are respectively provided on both sides of the circumferential center line and both sides of the axial center line, and the distance between each scale line is 1 mm.

[0010] To determine whether the deviation direction of the bump in the axial direction is a positive deviation or a negative deviation, it is set that one end of the rear joint of the cylinder is a positive deviation, and a "+" is marked at the scale line facing the rear joint end of the cylinder; one end of the front joint of the cylinder is a negative deviation, and a "-" is marked at the scale line facing the rear joint end of the cylinder.

[0011] To determine whether the deviation direction of the bump in the circumferential direction is a positive deviation or a negative deviation, when the deviation of the bump is biased towards the horizontal direction, the deviation is a positive deviation, and a "+" is marked at the scale line at one end towards the horizontal direction; when the deviation of the bump is biased towards the vertical direction, the deviation is a negative deviation, and a "-" is marked at the scale line at one end towards the vertical direction.

[0012] The mating end faces between the support segments are all stepped, and the mating end faces are mutually engaged through the steps to ensure that the assembly reference is in place, and fixing plates are respectively installed on both side surfaces of the engaged part.

[0013] The lower surface of the reference plate is an arc surface segment that fits with the outer circumferential surface of the cylinder to be detected, and the arc surface of the arc surface segment is the positioning surface of the cylinder to be detected. There are mounting holes for the support beam on the symmetric plane in the length direction of the upper surface of the reference plate; there are mounting holes for the positioning pins on both sides of the mounting hole. Mounting holes for positioning screws are distributed on the arc surface segment, and the mounting holes of the positioning screws are concentric with the threaded reference holes at the front end of the cylinder to be detected.

[0014] The method for detection using the segmented auxiliary detection tooling for the cylinder bump proposed by the present invention is as follows:

[0015] Step 1, before detecting the position accuracy of each bump of the cylinder by the segmented auxiliary tooling, use an electric engraving pen to respectively make an axial center marking line and a circumferential center marking line on the side surface of each bump.

[0016] Step 2, place the support beam of the auxiliary tooling at the symmetric generatrix of the bump on the outer circumferential surface of the cylinder, make the inner arc surface of the reference plate closely fit with the outer circumferential surface of the cylinder, and align the centers of the 4 threaded reference holes at the front joint end of the cylinder with the 4 positioning holes on the reference plate of the auxiliary tooling. At the same time, check and adjust the gap between each bump on the cylinder and the four inner surfaces of the detection holes one by one.

[0017] Step 3, connect the threaded reference holes at the front joint end of the cylinder and the positioning holes of the reference plate through 4 positioning screws and make them in tight fit to ensure that the assembly reference of the tooling is accurate and error-free.

[0018] Step 4, observe the coincidence degree of the detection lines on the axial inner surface and the detection lines on the circumferential inner surface in the detection holes on each detection plate with the axial center marking line or the circumferential center marking line on the corresponding bump.

[0019] When the axial detection lines and the circumferential detection lines on the inner surfaces respectively coincide with the axial center marking line and the circumferential center marking line on the corresponding bump, the position accuracy of the bump is qualified and meets the requirements.

[0020] When the axial detection line on each of the inner surfaces coincides with the axial center mark on the corresponding bump, but the detection line on the circumferential inner surface does not coincide with the circumferential center mark on the bump, the bump position accuracy is unqualified and does not meet the requirements.

[0021] When the circumferential detection line on each inner surface coincides with the circumferential center mark on the corresponding bump, but the detection line on the axial inner surface does not coincide with the axial center mark on the bump, the bump position accuracy is unqualified and does not meet the requirements.

[0022] When the axial detection lines on the inner surface and the detection lines on the circumferential inner surface do not coincide with the axial center marking lines and the circumferential center marking lines on the corresponding protrusions, the position accuracy of the protrusions is unqualified and does not meet the requirements.

[0023] When determining whether the axial deviation direction of the bump is positive or negative, if the axial center mark line is biased toward the end of the rear joint of the cylinder, it indicates that the axial position of the bump is longer than the standard size, which is a positive deviation; if the axial center mark line is biased toward the end of the front joint of the cylinder, it indicates that the axial position of the bump is shorter than the standard size, which is a negative deviation.

[0024] When determining whether the circumferential deviation direction of the protrusion is positive or negative, if the circumferential center mark line deviates toward the horizontal direction of the end face of the rear joint of the cylinder, it indicates that the circumferential position of the protrusion is larger than the standard size, which is a positive deviation; if the circumferential center mark line deviates toward the vertical direction of the end face of the rear joint of the cylinder, it indicates that the circumferential position of the protrusion is smaller than the standard size, which is a negative deviation.

[0025] Step 5: According to the offset positions of the axial center mark and the circumferential center mark on the axial and circumferential detection lines of the corresponding detection holes, the axial and circumferential offset values ​​are directly recorded using the number of deviation scale lines and the "+" and "-" marks. The detection results of each protrusion of the cylinder are obtained by recording the axial and circumferential offset values ​​of each protrusion one by one.

[0026] The present invention is a tool for detecting the accuracy of bumps on a cylinder and a detection method thereof. The cylinder is provided with 4 rows of bumps obtained by machining, the total number of which is greater than 10, and the spacing between two bumps located at both ends of the cylinder is greater than 3000 mm. After machining is completed, the shape accuracy of each bump needs to be detected. The tool proposed by the present invention does not require multiple measurements or large-scale detection instruments. It only needs to detect the shape angle and position accuracy of the corresponding bumps by using multiple sets of shape detection plates, and the position accuracy detection of all bumps can be completed at one time.

[0027] When the present invention is in use, the segmented auxiliary tooling is first placed as a whole on the cylinder, and the reference plate on the segmented auxiliary tooling is connected to the reference hole on the cylinder through positioning screws. The position accuracy of each convex block is determined by detecting the coincidence degree between the axial center marking line and the circumferential center marking line of the outer profile surface of the cylinder convex block and the detection line on the inner profile surface of the corresponding monitoring hole.

[0028] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0029] The present invention is connected and positioned through the positioning screws installed on the reference plate of the multi-segment combined support beam and the reference hole of the cylinder; the shape and position accuracy of each convex block are determined by the coincidence degree between the detection line on the inner profile surface of each detection hole and the axial center marking line and the circumferential center marking line of the corresponding convex block; by comparing the scales, the error values of the convex block in the axial and circumferential directions can be directly determined. The detection of the shape accuracy of the convex block on the cylinder can be realized by one installation, with simple and convenient operation and high efficiency.

[0030] When determining whether the shape and position accuracy of each convex block meet the requirements: if the circumferential center marking line and the circumferential center marking line of each convex block on the cylinder completely coincide with the detection line of the corresponding detection hole, it is determined that the position accuracy of each convex block on the cylinder is qualified; if the circumferential center marking line and the circumferential center marking line of a certain convex block do not coincide with the detection line of the corresponding detection hole, it is determined that the position accuracy of the convex block is unqualified, and by reading the scale line between the center marking line and / or the circumferential center marking line of the convex block and the detection line of the detection hole, the actual deviation value of the convex block in the axial or circumferential direction is determined and recorded. By checking and confirming the scale difference between each convex block and the detection hole one by one, the detection of the position accuracy of all the convex blocks on the outer side of the cylinder can be realized, and at the same time, the measurement error caused by repeated measurement with a vernier caliper in multiple directions is avoided, with high measurement accuracy and simple operation.

[0031] The segmented support beam adopted by the present invention can complete the rapid detection of the cylinder convex block by increasing or decreasing several groups of support beams according to the actual length of the cylinder. Especially when the length of the cylinder is greater than 5000 mm, it has obvious advantages. Because compared with the integral detection tooling, detection toolings with corresponding lengths need to be manufactured for different lengths of cylinders. When the length of the cylinder is greater than 5000 mm, the processing difficulty of the integral tooling increases significantly, and at the same time, the transportation and storage costs are high. While the segmented auxiliary tooling is in an assembled form, the processing difficulty of the single support segment is low, and it adopts a simple assembly method, with convenient operation and easy storage.

[0032] The segmented auxiliary tooling can judge whether the position accuracy of each convex block on the cylinder is qualified through one installation. More importantly, the actual deviation data of the position accuracy of each convex block can be directly and quickly obtained visually. Description of the Drawings

[0033] Figure 1 This is the front view of the present invention.

[0034] Figure 2 is Figure 1 the top view of

[0035] Figure 3 This is the side view of the segmented auxiliary tooling assembled with the cylinder.

[0036] Figure 4a This is the front view of the segmented support beam assembly; Figure 4b is Figure 4a the schematic structural view in the A-A direction in

[0037] Figure 5 This is the front view of the support beam.

[0038] Figure 6a This is the sectional view of the reference plate; Figure 6b This is the top view of the reference plate.

[0039] Figure 7a This is the front view of the detection plate. Figure 7b This is the top view of the detection plate. Figure 7c is Figure 7b the partial schematic view of part A in Figure 7d This is the mating diagram of the detection hole and the convex block, Figure 7e This is the schematic view of the convex block.

[0040] Figure 8 This is the front view of the fixing plate.

[0041] Figure 9 This is the schematic view for determining the positive and negative deviations of the convex block accuracy of the present invention.

[0042] In the figure: 1. Support beam; 2. Positioning pin; 3. Fixing screw; 4. Positioning screw; 5. Reference plate; 6. Detection plate; 7. Assembly bolt; 8. Fixing plate; 9. Cylindrical pin; 10. Detection hole; 11. Cylinder; 12. Convex block; 13. Detection line; 14. Scale line; 15. Axial center marking line; 16. Circumferential center marking line. Detailed implementation manner

[0043] This embodiment is a segmented auxiliary tooling for detecting the shape of the convex block of the cylinder, including a support beam 1, a reference plate 5, a plurality of detection plates 6 and a plurality of fixing plates 8. Among them: the reference plate and the plurality of detection plates are arranged on the support beam along the length direction of the support beam, and the symmetry plane in the width direction of the reference plate and the symmetry plane in the width direction of each detection plate are located on the same straight line, and the upper surface of the reference plate and the upper surface of each detection plate are in the same horizontal plane.

[0044] The support beam 1 is formed by end-to-end lapping of multiple support segments, which plays a rigid support role in the detection tooling. Each support segment is made of an aluminum I-shaped profile, and is installed segment by segment on the upper surface of the reference plate 5 and / or the detection plate 6, and the end faces of adjacent support segments are butt-jointed to form the support beam. The end faces of adjacent support segments are fixedly connected through the fixing plate 8. The length of the support beam is determined according to the length of the cylinder to be detected. The number of the reference plates 5 is 1, and it is fastened to the threaded reference hole at the front end of the cylinder through the positioning screw 4 to realize the fixed connection between the reference plate 5 and the cylinder, so as to determine the tooling assembly reference.

[0045] The positions of the respective detection plates 6 correspond to the positions of the respective bumps 12 distributed on the outer circumferential surface of the cylinder, and the lengths of the four inner sides of each detection hole are respectively greater than the lengths of the four sides of the bump. When each detection hole is respectively fitted with the corresponding bump, there is a 10-mm gap between the four side surfaces of each bump and the four inner surfaces of each detection hole, forming a detection space around the circumferential surface of each bump. The detection plate 6 is fixedly connected to the support beam 1 through the fixing screw 3 and the positioning pin 2.

[0046] The structures of the respective support segments are the same. The cross-section of each support segment is in the shape of an I, and is fixed on the upper surfaces of the reference plate 5 and the detection plate 6 through the fixing screw 3 and the positioning pin 2 on the lower surface of the support segment. The mating end faces between the support segments are all in a stepped shape, and the mating end faces are mutually fitted through the steps to ensure that the assembly reference is in place, and fixing plates 8 are respectively installed on the two side surfaces of the fitting part.

[0047] The detection plate 6 is a rectangular plate and is made of carbon steel. The lower surface of the detection plate is an arc surface, and the radius of the arc surface is the same as the radius of the cylinder to be detected. There is an installation hole for the support beam 1 in the middle of the upper surface of the detection plate, and the support beam 1 is fixed on the upper surface of the detection plate through the fixing screw. Pin holes for the positioning pins 2 are distributed on both sides of the fixing screw installation hole. The lower surface of the detection plate is an arc surface. The radius of the arc surface is the same as the radius of the cylinder and fits with the outer circumferential surface of the cylinder. There are 2 rectangular detection holes 10 distributed on both sides of the detection plate; the circumferential surfaces inside each detection hole are inner surfaces, and the inner surfaces at the two short sides of each detection hole are axial inner surfaces for detecting the shape accuracy of the bump in the axial direction; the inner surfaces at the two long sides of each detection hole are circumferential inner surfaces for detecting the shape accuracy of the bump in the axial direction.

[0048] Detection lines are provided on each inner surface. The detection lines 13 are divided into circumferential center lines and axial center lines. Among them, the detection lines at the symmetry lines in the length direction of each circumferential inner surface are circumferential center lines; the detection lines at the symmetry lines in the length direction of each axial inner surface are axial center lines. Scale lines 14 are respectively provided on both sides of the circumferential center line and both sides of the axial center line, and the distance between each scale line is 1 mm.

[0049] To determine whether the deviation direction of the bump in the axial direction is a positive deviation or a negative deviation, it is set that one end of the cylindrical rear joint is the positive deviation, and a "+" is marked at the scale line facing this end of the cylindrical rear joint; one end of the cylindrical front joint is the negative deviation, and a "-" is marked at the scale line facing this end of the cylindrical rear joint.

[0050] The "+" marks on both sides of each of the axial detection lines and the circumferential detection lines indicate a tendency to be larger than the standard size, and the "-" marks indicate a tendency to be smaller than the standard size.

[0051] To determine whether the deviation direction of the bump in the circumferential direction is a positive deviation or a negative deviation, when the deviation of the bump is biased towards the horizontal direction, this deviation is a positive deviation, and a "+" is marked at the scale line facing the horizontal direction end; when the deviation of the bump is biased towards the vertical direction, this deviation is a negative deviation, and a "-" is marked at the scale line facing the vertical direction end.

[0052] During use, by the degree of coincidence between the detection lines 13 in each of the detection holes and the axial center marking line 15 and the circumferential center marking line 16 on each bump respectively, the deviation value is directly read to determine whether the position accuracy of the bump meets the design requirements, so as to realize the rapid detection of each bump.

[0053] The reference plate 5 is a rectangular plate made of carbon steel. The lower surface of this reference plate is also an arc surface section that fits the outer circumferential surface of the cylinder to be detected, and the arc surface of this arc surface section is the positioning surface of the cylinder to be detected. There are mounting holes for the support beam 1 on the symmetry plane in the length direction of the upper surface of this reference plate; there are mounting holes for the positioning pins 2 on both sides of these mounting holes. There are mounting holes for the positioning screws 4 distributed on the arc surface section, and the mounting holes of each positioning screw are concentric with the threaded reference holes at the front end of the cylinder to be detected.

[0054] This embodiment also proposes a usage method for detecting the position accuracy of the cylinder bumps by using the segmented auxiliary tooling. The specific process is as follows:

[0055] Step 1, before detecting the position accuracy of each bump of the cylinder by the segmented auxiliary tooling, use an electric engraving pen to respectively make an axial center marking line 15 and a circumferential center marking line 16 on the side surfaces of each bump. The width and depth of the marking lines are both 0.1 mm, which is convenient for subsequent visual inspection and determination.

[0056] Step 2, place the auxiliary tooling support beam at the symmetrical generatrix of the protrusion on the outer circumferential surface of the cylinder 11, make the inner arc surface of the reference plate 5 fit closely with the outer circumferential surface of the cylinder 11, and align the four threaded reference holes at the front joint end of the cylinder with the centers of the four positioning holes of the reference plate 5 on the auxiliary tooling. At the same time, check and adjust each protrusion of the cylinder one by one to be located in the auxiliary tooling detection hole to prevent the protrusion from interfering or not fitting with the auxiliary tooling due to improper assembly relationship, resulting in the inability of the auxiliary tooling to be installed and tested normally.

[0057] Step 3, connect the threaded reference hole of the front joint end of the cylinder with the positioning hole of the reference plate 5 through four positioning screws 4 and make them fit tightly to ensure that the tooling assembly reference is accurate and error-free.

[0058] Step 4, observing the coincidence of the detection line 13 on the axial inner surface and the detection line 13 on the circumferential inner surface of the detection hole on each detection plate 6 with the axial center mark line 15 and the circumferential center mark line 16 on the corresponding protrusion.

[0059] When the axial detection line on each inner surface and the detection line 13 on the circumferential inner surface respectively coincide with the axial center mark line 15 and the circumferential center mark line 16 on the corresponding bump, the bump position accuracy is qualified and meets the requirements.

[0060] When the axial detection line on each inner surface coincides with the axial center mark 15 on the corresponding bump, but the detection line on the circumferential inner surface does not coincide with the circumferential center mark 16 on the bump, the bump position accuracy is unqualified and does not meet the requirements.

[0061] When the circumferential detection line on each inner surface coincides with the circumferential center mark 15 on the corresponding bump, but the detection line on the axial inner surface does not coincide with the axial center mark 16 on the bump, the bump position accuracy is unqualified and does not meet the requirements.

[0062] When the axial detection lines on the inner profile and the detection lines on the circumferential inner profile do not coincide with the axial center marking line 15 and the circumferential center marking line 16 on the corresponding bump, the bump position accuracy is unqualified and does not meet the requirements.

[0063] When determining whether the axial deviation direction of the bump is positive or negative, if the axial center mark line is biased toward the end of the rear joint of the cylinder, it indicates that the axial position of the bump is longer than the standard size, which is a positive deviation; if the axial center mark line 15 is biased toward the end of the front joint of the cylinder, it indicates that the axial position of the bump is shorter than the standard size, which is a negative deviation.

[0064] When determining whether the circumferential deviation direction of the bump is a positive deviation or a negative deviation, if the circumferential center marking line 16 deviates towards the horizontal direction of the end face of the rear joint of the cylinder, it indicates that the circumferential position of the bump is larger than the standard size, which is a positive deviation; if the circumferential center marking line 16 deviates towards the vertical direction of the end face of the rear joint of the cylinder, it indicates that the circumferential position of the bump is smaller than the standard size, which is a negative deviation.

[0065] Step 5: According to the offset positions of the axial center marking line 15 and the circumferential center marking line 16 on the axial and circumferential detection lines of the corresponding detection holes, directly record the axial and circumferential offset values by using the number of deviation scale lines 14 and the "+" and "-" markings. By recording the offset values of each bump in the axial and circumferential directions one by one, the detection results of each bump of the cylinder are obtained.

Claims

1. A segmented auxiliary detection tooling for cylindrical bumps, characterized in that, It includes a support beam, a reference plate, a plurality of detection plates and a plurality of fixing plates; wherein: the reference plate and the plurality of detection plates are arranged on the support beam along the length direction of the support beam, and the symmetry plane in the width direction of the reference plate and the symmetry planes in the width direction of the respective detection plates are located on the same straight line, and the upper surfaces of the reference plate and the respective detection plates are in the same horizontal plane; the support beam is formed by end-to-end lapping of a plurality of support segments, and each support segment is separately installed on the upper surface of the reference plate and / or the detection plate, and the end faces of adjacent support segments are butted; the positions of the plurality of detection plates respectively correspond to the positions of the respective bumps distributed on the outer circumferential surface of the cylinder, so that the detection holes located on each detection plate can be respectively fitted with the corresponding bumps; the reference plate is fixedly connected to the threaded reference hole at the front end of the cylinder; The lower surface of the detection plate is an arc surface, and the radius of the arc surface is the same as the radius of the cylinder to be detected and fits with the outer circumferential surface of the cylinder to be detected; there is an installation hole of the support beam in the middle of the upper surface of the detection plate, and the support beam is fixed on the upper surface of the detection plate by fixing screws; pin holes of positioning pins are distributed on both sides of the fixing screw installation hole; two rectangular detection holes are distributed on both sides of the detection plate; the peripheral surfaces inside each detection hole are respectively inner surfaces, and the inner surfaces at the two short sides of each detection hole are axial inner surfaces for detecting the shape accuracy of the bump in the axial direction; the inner surfaces at the two long sides of each detection hole are circumferential inner surfaces for detecting the shape accuracy of the bump in the axial direction; The lengths of the four inner sides of each detection hole are respectively greater than the lengths of the four sides of the bump; when each detection hole is respectively fitted with the corresponding bump, there is a gap of 10 mm between the four side surfaces of each bump and the four inner surfaces of each detection hole, forming a detection space around the peripheral surface of each bump; Detection lines are provided on each inner surface; the detection lines are divided into a circumferential center line and an axial center line. Among them, the detection line at the symmetry line in the length direction of each circumferential inner surface is the circumferential center line; the detection line at the symmetry line in the length direction of each axial inner surface is the axial center line; scale lines are respectively provided on both sides of the circumferential center line and both sides of the axial center line, and the distance between each scale line is 1 mm; To determine whether the deviation direction of the bump in the axial direction is a positive deviation or a negative deviation, it is set that one end of the rear joint of the cylinder is the positive deviation, and a "+" is marked at the scale line facing one end of the rear joint of the cylinder; one end of the front joint of the cylinder is the negative deviation, and a "-" is marked at the scale line facing one end of the rear joint of the cylinder; To determine whether the deviation direction of the bump in the circumferential direction is a positive deviation or a negative deviation, when the deviation of the bump is biased towards the horizontal direction, the deviation is a positive deviation, and a "+" is marked at the scale line facing one end of the horizontal direction; when the deviation of the bump is biased towards the vertical direction, the deviation is a negative deviation, and a "-" is marked at the scale line facing one end of the vertical direction.

2. The segmented auxiliary detection tooling for a cylindrical bump according to claim 1, wherein The mating end faces between the respective support segments are all stepped, and the respective mating end faces are mutually fitted through the steps to ensure that the assembly reference is in place, and fixing plates are respectively installed on both side surfaces of the fitting part.

3. The segmented auxiliary detection tooling for the cylindrical bump according to claim 1, wherein, The lower surface of the reference plate is an arc segment that matches the outer circumferential surface of the cylinder to be detected, and the arc surface of the arc segment is the positioning surface of the cylinder to be detected; there is a mounting hole for the support beam on the symmetrical surface in the length direction of the upper surface of the reference plate; there are mounting holes for the locating pin on both sides of the mounting hole; mounting holes for positioning screws are distributed on the arc segment, and the mounting holes of each positioning screw are made concentric with the threaded reference hole at the front end of the cylinder to be detected.

4. A method for detection using the segmented auxiliary detection tooling for cylindrical bumps described in claim 1, characterized in that, The specific process is: Step 1: Before the segmented auxiliary tooling detects the position accuracy of each protrusion of the cylinder, an axial center mark line and a circumferential center mark line are made on the side surface of each protrusion using an electric engraving pen; Step 2, place the auxiliary tooling support beam at the symmetrical generatrix of the convex block on the outer circumferential surface of the cylinder, make the inner arc surface of the reference plate fit closely with the outer circumferential surface of the cylinder, align the four threaded reference holes at the front joint end of the cylinder with the centers of the four positioning holes on the reference plate on the auxiliary tooling; at the same time, check and adjust the gaps between each convex block on the cylinder and the four inner surfaces of the detection hole one by one; Step 3, connect the threaded reference hole of the front joint end of the cylinder with the positioning hole of the reference plate through 4 positioning screws to make them fit tightly to ensure that the tooling assembly reference is accurate and error-free; Step 4, observing the degree of coincidence between the detection line on the axial inner surface and the detection line on the circumferential inner surface of the detection hole on each detection plate and the axial center mark line or the circumferential center mark line on the corresponding protrusion; When the axial detection line on each of the inner surfaces and the detection line on the circumferential inner surface respectively coincide with the axial center marking line and the circumferential center marking line on the corresponding convex block, the position accuracy of the convex block is qualified and meets the requirements; When the axial detection line on each of the inner surfaces coincides with the axial center mark on the corresponding bump, but the detection line on the circumferential inner surface does not coincide with the circumferential center mark on the bump, the bump position accuracy is unqualified and does not meet the requirements; When the circumferential detection line on each of the inner surfaces coincides with the circumferential center mark on the corresponding bump, but the detection line on the axial inner surface does not coincide with the axial center mark on the bump, the bump position accuracy is unqualified and does not meet the requirements; When the axial detection line on each of the inner surfaces and the detection line on the circumferential inner surface do not coincide with the axial center marking line and the circumferential center marking line on the corresponding convex block, the position accuracy of the convex block is unqualified and does not meet the requirements; Step 5, according to the offset positions of the axial center mark line and the circumferential center mark line on the axial and circumferential detection lines of the corresponding detection holes, directly record the axial and circumferential offset values ​​using the number of deviation scale lines and the "+" and "-" marks; obtain the detection results of each bump of the cylinder by recording the axial and circumferential offset values ​​of each bump one by one.

5. A method for detection using the segmented auxiliary detection tooling for cylindrical bumps described in claim 4, characterized in that: When determining whether the axial deviation direction of the protrusion is positive or negative, if the axial center mark line deviates toward the end of the rear joint of the cylinder, it indicates that the axial position of the protrusion is longer than the standard size, which is a positive deviation; if the axial center mark line deviates toward the end of the front joint of the cylinder, it indicates that the axial position of the protrusion is shorter than the standard size, which is a negative deviation; When determining whether the circumferential deviation direction of the bump is positive or negative, if the circumferential center mark line deviates toward the 3 o'clock direction of the end face of the rear joint of the cylinder, it indicates that the circumferential position of the bump is larger than the standard size, which is a positive deviation; if the circumferential center mark line deviates toward the 9 o'clock direction of the end face of the rear joint of the cylinder, it indicates that the circumferential position of the bump is smaller than the standard size, which is a negative deviation.

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