Auxiliary device for detecting residual stress of iron casting

Abstract

The utility model discloses an auxiliary device for detecting residual stress of an iron casting, which comprises a base, a drilling assembly is arranged on the base, and a drill bit is arranged on the drilling assembly; a mounting seat is further arranged on the base, a cover plate capable of being opened and closed is arranged on the mounting seat, a groove is formed in the mounting seat, a through hole corresponding to the groove is formed in the cover plate, and the through hole is located under the drill bit; at least one group of clamping pieces is arranged on the side edge of the groove on the mounting seat, and the clamping pieces are used for clamping a to-be-tested sample. The auxiliary device for detecting the residual stress of the iron casting is simple in structure, easy to operate and use, and capable of better accommodating and clamping a sample, so that a drill bit can accurately drill a hole in a strain gauge on the surface of the sample, and the accuracy and the detection efficiency of stress detection are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of iron casting detection, in particular to an auxiliary device for detecting residual stress of iron castings. Background Art

[0002] Residual stress refers to the self-balanced internal stress that exists within an object in the absence of external influences. This stress is typically caused by the effects of various process factors during the manufacturing process. Even after these factors disappear, some of these effects and influences remain within the object. Residual stress can be caused by a variety of factors, including uneven deformation, plastic deformation, or phase transitions during machining, thermal processing, and chemical treatment. It significantly impacts the performance and lifespan of an object. Harmful residual stress can reduce the fatigue life and strength of a material and increase the risk of crack growth and fracture.

[0003] Existing residual stress detection methods mostly involve attaching strain gauges to the surface of the workpiece, then drilling holes at the locations of the strain gauges to release local stress, connecting a residual stress detection device to the strain gauges, and calculating the magnitude of the residual stress based on the strain data. However, although existing designs are mostly used to improve the alignment problem between the drill bit and the strain gauge, in actual operation, there may still be certain difficulties in aligning the axis of the drilling device with the strain gauge, affecting the detection accuracy. Moreover, when the bottom of the workpiece being measured is uneven or has protrusions, it is not convenient for the workpiece to be installed smoothly. Summary of the Invention

[0004] The purpose of the utility model is to provide an auxiliary device for residual stress detection of cast iron parts in view of the problems existing in the prior art.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] An auxiliary device for residual stress detection of cast iron parts, comprising a base, a drilling assembly being provided on the base, and a drill bit being provided on the drilling assembly; the base is also provided with a mounting seat, an openable and closable cover plate being provided on the mounting seat, a groove being provided in the mounting seat, a through hole corresponding to the groove being provided on the cover plate, and the through hole being located directly below the drill bit; the mounting seat is provided with at least one set of clamping members on the side of the groove, and the clamping members are used to clamp the sample to be tested.

[0007] The auxiliary device for residual stress detection of cast iron parts has a simple structure, is easy to operate and use, and can better accommodate and clamp the sample so that the drill bit can accurately drill holes on the strain gauge on the surface of the sample, which is beneficial to improving the accuracy and efficiency of stress detection.

[0008] The mounting seat is configured to support the sample to be tested, and in conjunction with the clamping member, it can effectively secure the sample to be tested, ensuring that it is correctly installed and that it does not easily shift or deviate during the drilling process. By providing the groove within the mounting seat, when the sample to be tested (the cast iron part) is irregular or has a protrusion on the bottom of the cast iron part, the bottom of the cast iron part can be placed within the groove. This can accommodate the irregular or protruding portion of the bottom of the sample to be tested, ensuring that its upper surface, i.e., the surface with the strain gauge attached, is arranged horizontally on the mounting seat. This arrangement not only facilitates the installation of the sample to be tested, but also helps improve the accuracy of the test.

[0009] The setting of the groove can perform stress detection on workpieces of more shapes, increasing the diversity of device detection. The shape of the groove can also be set to various shapes according to actual needs; at the same time, the groove can also collect debris generated when drilling the sample to be tested, protecting the working environment.

[0010] Furthermore, a pair of fixing strips are provided on the upper edge of the mounting seat, and the clamping members are provided on opposite sides of the pair of fixing strips; one side of the cover plate is rotatably connected to one of the fixing strips, and the other side of the cover plate is snap-connected to the other fixing strip. This snap-connection method is simple and convenient.

[0011] Furthermore, protrusions are provided at both ends of the fixing strip, and a slot for connecting the protrusions is provided on the inner side of the open end of the cover.

[0012] Furthermore, the clamping member includes a pair of clamping plates, and an adaptive elastic element or a locking element connected to the clamping plates to provide a suitable clamping force.

[0013] Furthermore, the central axis of the drill bit and the vertical center line of the through hole are on the same vertical line.

[0014] Furthermore, the drilling assembly includes a steel shaft arranged on the base, a movable platform that can be raised and lowered is connected to the steel shaft, the drill bit is arranged downward at one end of the movable platform away from the steel shaft, and a drive motor that is connected to and drives the drill bit is also provided on the movable platform.

[0015] Furthermore, a connecting shaft is provided at the upper end of the drill bit, which is connected to the movable platform through a bearing and extends from above the movable platform, and a driven wheel is provided on the connecting shaft; a motor mounting plate for mounting the driving motor is provided on one side of the movable platform, and a driving wheel is provided at the output end of the driving motor, and the driving wheel and the driven wheel are connected by a transmission belt.

[0016] Furthermore, a fixed platform is provided below the steel shaft and the fixed platform is provided with a lifting rod, which is connected to the mobile platform and can control the lifting of the mobile platform.

[0017] Compared with the prior art, the beneficial effects of the present invention are: 1. The auxiliary device for residual stress detection of cast iron parts has a simple structure, is easy to operate and use, and can better accommodate and clamp the sample so that the drill bit can accurately drill holes on the strain gauge on the surface of the sample, which is beneficial to improving the accuracy and efficiency of stress detection; 2. The setting of the mounting seat can be used to carry the sample to be tested, and the setting of the clamping member can better fix the sample to be tested, ensuring that its installation position is correct and that it will not be easily displaced or deviated during the drilling process; 3. By arranging the groove inside the mounting seat, the irregular or protruding parts of the bottom of the sample to be tested can be accommodated to ensure that the sample is properly installed. Prove that its upper surface, that is, the surface with the strain gauge is arranged horizontally on the mounting base. Such an arrangement is not only conducive to the installation of the sample to be tested, but also conducive to improving the accuracy of the detection; 4. The arrangement of the groove can perform stress detection on workpieces of more shapes, increasing the diversity of device detection. At the same time, the groove can also collect debris generated when the sample to be tested is drilled, protecting the working environment; 5. The central axis of the drill bit and the vertical center line of the through hole are on the same vertical line. When the drill bit drills the sample to be tested, it can be well ensured that the axis of the drill bit and the strain gauge are corresponding, reducing the difficulty of axis alignment adjustment and increasing the detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the mounting base of the auxiliary device of the utility model;

[0019] Figure 2 The overall structure of the auxiliary device of the utility model is shown in FIG. Figure 1 ;

[0020] Figure 3 The overall structure of the auxiliary device of the utility model is shown in FIG. Figure 2 ;

[0021] In the figure: 1. Base; 2. Mounting seat; 3. Fixing bar; 4. Compression spring; 5. Clamp; 6. Cover; 7. Groove; 8. Bump; 9. Slot; 10. Steel shaft; 11. Fixed platform; 12. Moving platform; 13. Driving motor; 14. Driving wheel; 15. Driven wheel; 16. Transmission belt; 17. Drill bit; 18. Motor switch; 19. Power socket; 20. Through hole. DETAILED DESCRIPTION

[0022] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," etc., etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] like Figures 1 to 3 As shown, an auxiliary device for residual stress detection of cast iron parts includes a base 1, which is a stainless steel base. The base 1 is provided with a drilling assembly, and the drilling assembly is provided with a drill bit 17; the base 1 is also provided with a mounting base 2, and the mounting base 2 is provided with an openable and closable cover plate 6, a groove 7 is provided in the mounting base 2, and a through hole 20 corresponding to the groove 7 is provided on the cover plate 6, and the through hole 20 is located directly below the drill bit 17; the mounting base 2 is provided with at least one set of clamping members on the side of the groove 7, and the clamping members are used to clamp the sample to be tested.

[0025] The auxiliary device for residual stress detection of cast iron parts has a simple structure, is easy to operate and use, and can better accommodate and clamp the sample so that the drill bit can accurately drill holes on the strain gauge on the surface of the sample, which is beneficial to improving the accuracy and efficiency of stress detection.

[0026] The mounting base 2 is configured to support the sample to be tested, and in conjunction with the clamping member, it can effectively secure the sample to be tested, ensuring that it is correctly installed and that it does not easily shift or deviate during the drilling process. By providing the groove 7 within the mounting base 2, when the sample to be tested (the cast iron part) is irregular or has a protrusion on the bottom of the cast iron part, the bottom of the cast iron part can be placed within the groove. This can accommodate the irregular or protruding portion of the bottom of the sample to be tested, ensuring that its upper surface, that is, the surface with the strain gauge attached, is arranged horizontally on the mounting base. This arrangement not only facilitates the installation of the sample to be tested, but also helps improve the accuracy of the test.

[0027] The setting of the groove 7 can perform stress detection on workpieces of more shapes, increasing the diversity of device detection. The shape of the groove 7 can also be set to various shapes according to actual needs; at the same time, the groove 7 can also collect debris generated by the test sample during drilling, protecting the working environment.

[0028] The cover plate 6 is configured to press the four sides of the sample to be tested from above, and can further fix the sample to be tested. The through hole 20 provided thereon corresponds to the groove 7, and can expose the strain gauge pasted on the sample to be tested without affecting its drilling operation.

[0029] In specific implementation, when testing the residual stress of the cast iron part, first, a strain gauge is attached to the point of maximum residual stress of the cast iron part or the point where the workpiece is subjected to the greatest force during use, and then the cast iron part is placed between the clamps 5, and the cast iron part is pressed downward so that the cast iron part can be firmly clamped between the clamps 5, and then the cover plate 6 is rotated so that it covers the mounting seat. At this time, the strain gauge will be placed inside the through hole 20. Since the drill bit 17 is located directly above the through hole 20, when the drill bit 17 drills the cast iron part and the strain gauge thereon, it avoids the occurrence of certain difficulties in aligning the axis of the drilling assembly with the strain gauge, thereby increasing the detection accuracy.

[0030] Furthermore, a pair of fixing bars 3 are provided on the upper edge of the mounting base 2, and the clamping members are provided on opposite sides of the pair of fixing bars 3; one side of the cover plate 6 is rotatably connected to one of the fixing bars, and the other side of the cover plate is engaged with the other fixing bar.

[0031] The pair of fixing bars 3 provide space for the clamping member and facilitate connection to the cover plate, allowing a certain gap between the inner side of the cover plate 6 and the upper surface of the mounting base to accommodate the upper portion of the sample to be tested. The cover plate can also be opened and closed conveniently by flipping.

[0032] Furthermore, protrusions 8 are provided at both ends of the fixing bar 3, and slots 9 are provided on the inner side of the open end of the cover plate 6 to connect with the protrusions 8. The cooperation between the protrusions 8 and the slots 9 enables the cover plate 6 to be connected and closed; in practice, other types of fasteners or locking members can also be used to perform the cover closing operation.

[0033] Furthermore, the clamping member includes a pair of clamping plates 5 and an adaptive elastic element or a locking element connected to the clamping plates 5 .

[0034] In this embodiment, the adaptive elastic element is a compression spring 4, one end of which is connected to the fixing bar 3 and the other end is connected to the clamping plate 5. A pair of compression springs 4 is provided between each clamping plate 5 and the fixing bar 3. The spring force of the pair of compression springs 4 can smoothly apply spring force to the clamping plate. The pair of clamping plates 5 are also symmetrically arranged. When the sample to be tested is placed between the pair of clamping plates 5, the pair of clamping plates 5 will simultaneously clamp the two ends of the sample to be tested and fix the sample to be tested. Preferably, the compression spring 4 is also provided with a pneumatic or hydraulic telescopic rod connecting the clamping plate and the fixing bar, which can further improve the stability and directionality of the compression spring clamping.

[0035] In some embodiments, a locking element may be provided to adjust and lock the clamping plate. The locking element may be a locking screw or the like.

[0036] Furthermore, the central axis of the drill bit 17 is on the same vertical line as the vertical center line of the through hole 20. When the drill bit 17 drills the test sample, it can well ensure that the axis of the drill bit 17 and the strain gauge are aligned, which reduces the difficulty of axis alignment adjustment and improves the detection accuracy.

[0037] Furthermore, the drilling assembly includes a steel shaft 10 arranged on the base 1, and the steel shaft 10 is a hardened chrome-plated steel shaft. A liftable movable platform 12 is connected to the steel shaft 10, and the end of the movable platform 12 away from the steel shaft 10 is provided with the drill bit 17 arranged downward, and the movable platform 12 is also provided with a drive motor 13 connected to and driving the drill bit 17.

[0038] A connecting shaft is provided at the upper end of the drill bit 17, which is connected to the movable platform 12 through a bearing and extends from above the movable platform. A driven wheel 15 is provided at the upper extending portion of the connecting shaft. A motor mounting plate for mounting the drive motor 13 is provided on one side of the movable platform 12. A driving wheel 14 is provided at the output end (such as the drive shaft) of the drive motor 13 extending from above. The driving wheel 14 is connected to the driven wheel 15 through a transmission belt 16.

[0039] During specific implementation, the drive motor 13 is started, and the drive shaft of the drive motor 13 rotates to drive the active wheel 14 to rotate, and the active wheel 14 drives the transmission belt 16 to move to rotate the driven wheel 15, thereby rotating the drill bit 17. Since the drive shaft of the drive motor 13 rotates very quickly, the power of the motor is transmitted to the drill bit 17 through the active wheel 14, the driven wheel 15 and the transmission belt 16 to rotate the drill bit 17. The power consumed by the active wheel 14, the driven wheel 15 and the transmission belt 16 is very small, so the rotation speed of the drill bit 17 does not drop much, and the high-speed rotation of the drill bit 17 can be realized to drill the workpiece.

[0040] In some embodiments, a cavity and a wiring groove are provided on the outer side of the mobile platform 12, which can be used for wiring and setting the controller, and the cable of the drive motor is introduced into the mobile platform. A power socket 19 and a motor switch 18 are provided on the side of the mobile platform 12. When in use, the device is connected to an external power supply through the power socket 19, and the motor switch 18 is pressed to start the drive motor 13.

[0041] Furthermore, a fixed platform 11 is provided below the steel shaft 10 and located below the movable platform 12. A lifting rod, such as an electric lifting rod or a hydraulic lifting rod, is provided on the fixed platform 11, and the lifting rod is connected to the movable platform 12. The lifting rod can further support the movable platform 12 and can also appropriately control the movable platform to rise and fall, while the steel shaft can serve as a guide.

[0042] When testing residual stress, this auxiliary device first selects a residual stress measurement point on the test sample (cast iron part). Generally, the point with the largest residual stress value on the test sample (cast iron part) or the point where the workpiece bears the largest force during use is selected. Then, the surface of the measured point is polished to a roughness of about Ra0.8, and the polished surface is cleaned with acetone or alcohol. The strain gauge is pasted on the cast iron part with 502 glue, and the strain gauge is insulated with transparent tape or insulating tape around it. It is then installed in the mounting seat. After fixing it, the lead on the strain gauge is connected to the measuring line of the residual stress detector through the terminal block, and the stress detector is corrected and reset. After debugging, the detection work begins.

[0043] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An auxiliary device for residual stress detection of cast iron parts, characterized in that: The tester comprises a base, a drilling assembly is provided on the base, and a drill bit is provided on the drilling assembly; the base is also provided with a mounting seat, an openable and closable cover is provided on the mounting seat, a groove is provided in the mounting seat, a through hole corresponding to the groove is provided on the cover, and the through hole is located directly below the drill bit; the mounting seat is provided with at least one set of clamping members on the side of the groove, and the clamping members are used to clamp the sample to be tested.

2. The auxiliary device for residual stress detection of cast iron parts according to claim 1, characterized in that: A pair of fixing bars are provided on the upper edge of the mounting seat, and the clamping members are provided on opposite sides of the pair of fixing bars; one side of the cover plate is rotatably connected to one of the fixing bars, and the other side of the cover plate is engaged with the other fixing bar.

3. The auxiliary device for residual stress detection of cast iron parts according to claim 2, characterized in that: Both ends of the fixing strip are provided with protrusions, and the inner side of the open end of the cover plate is provided with a card slot connected to the protrusions.

4. The auxiliary device for residual stress detection of cast iron parts according to claim 1, characterized in that: The clamping member includes a pair of clamping plates and an adaptive elastic element or a locking element connected to the clamping plates.

5. The auxiliary device for residual stress detection of cast iron parts according to claim 1, characterized in that: The central axis of the drill bit and the vertical center line of the through hole are on the same vertical line.

6. The auxiliary device for residual stress detection of cast iron parts according to claim 1, characterized in that: The drilling assembly includes a steel shaft arranged on the base, a movable platform that can be raised and lowered is connected to the steel shaft, the drill bit is arranged downward at one end of the movable platform away from the steel shaft, and a drive motor connected to and driving the drill bit is also provided on the movable platform.

7. The auxiliary device for residual stress detection of cast iron parts according to claim 6, characterized in that: A connecting shaft is provided at the upper end of the drill bit, which is connected to the movable platform through a bearing and extends from above the movable platform, and a driven wheel is provided on the connecting shaft; a motor mounting plate for mounting the driving motor is provided on one side of the movable platform, and a driving wheel is provided at the output end of the driving motor, and the driving wheel and the driven wheel are connected by a transmission belt.

8. The auxiliary device for residual stress detection of cast iron parts according to claim 6, characterized in that: The steel shaft is located below the movable platform and a fixed platform is provided. The fixed platform is provided with a lifting rod, and the lifting rod is connected to the movable platform.

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