Drilling device for blind hole residual stress detection

Abstract

The utility model relates to the technical field of residual stress detection, in particular to a drilling device for blind hole residual stress detection, which comprises a detection platform, the detection platform is fixedly provided with a guide cylinder and a plurality of adsorption footing bases distributed around the axis of the guide cylinder in a penetrating manner, and the adsorption footing bases are adsorbed and fixed on the outer wall of a to-be-detected workpiece. An alignment piece or a drill rod is placed in the guide cylinder, a guide lug plate is fixedly connected to the outer wall of the guide cylinder in a protruding mode, a guide rod penetrates through the guide lug plate in a sliding mode, the axial direction of the guide rod is parallel to the axial direction of the guide cylinder, the guide rod is fixedly connected with a pressing plate abutting against a strain rosette, and the guide cylinder is provided with an adjusting piece for adjusting the sliding position of the guide rod. The method has the effect of improving the detection precision of the residual stress of the blind hole.

Description

Technical Field

[0001] This application relates to the field of residual stress detection technology, and in particular to a drilling device for detecting residual stress in blind holes. Background Technology

[0002] During the manufacturing process, workpieces are subjected to various technological factors, such as welding, casting, and machining, which often create residual stress within the workpiece. This inevitably leads to material deformation, reduces the ultimate strength and fatigue strength of the component, and may even cause cracks and brittle fracture, thus affecting the normal performance of the workpiece. Therefore, it is particularly important to detect and evaluate the residual stress within the workpiece.

[0003] The blind hole method is the most widely used method for residual stress testing. The residual stress detected by the blind hole method is the residual stress within the object itself. It requires attaching strain gauges to the object and drilling holes through a drill rod to release the residual stress and obtain the test data. However, in existing technologies, vibrations caused during drilling can lead to slight displacements of the strain gauge positions, reducing the accuracy of the test data. Therefore, further improvements are needed. Utility Model Content

[0004] To improve the detection accuracy of residual stress in blind holes, this application provides a drilling device for detecting residual stress in blind holes.

[0005] The drilling device for detecting residual stress in blind holes provided in this application adopts the following technical solution:

[0006] A drilling device for detecting residual stress in blind holes includes a testing platform. A guide cylinder and several adsorption feet distributed around the axis of the guide cylinder are fixedly inserted into the testing platform. The adsorption feet are adsorbed and fixed to the outer wall of the workpiece to be tested. An alignment component or a drill rod is placed in the guide cylinder. A guide ear plate is protruding and fixedly connected to the outer wall of the guide cylinder. A guide rod is slidably inserted through the guide ear plate. The axis of the guide rod is parallel to the axis of the guide cylinder. A pressure plate that abuts against a strain gauge is fixedly connected to the guide rod. An adjustment component is provided in the guide cylinder to adjust the sliding position of the guide rod.

[0007] By adopting the above technical solution, during the test, the strain gauge is first attached to the surface of the workpiece to be tested. After the alignment component is placed in the guide cylinder for centering, the adsorption base is adsorbed and fixed to the surface of the workpiece to be tested. The sliding position of the guide rod is adjusted by the adjustment component so that the pressure plate is pressed against the strain gauge. Then, the alignment component is pulled out and the drill rod is inserted into the guide cylinder for drilling. The addition of the pressure plate improves the fixing effect of the strain gauge, thereby improving the detection accuracy of residual stress in blind holes.

[0008] Preferably, the pressure plate is provided with an elastic pad that abuts against the strain gauge.

[0009] By adopting the above technical solution, an elastic pad is added between the pressure plate and the strain gauge, which can effectively buffer the vibration and impact force generated during drilling, reduce the risk of displacement or damage to the strain gauge due to uneven force, and ensure that the strain gauge is always in a stable and reliable fixed state, thereby improving the accuracy and reliability of blind hole residual stress detection.

[0010] Preferably, the pressure plate has a through hole for the lower end of the drill rod to pass through, and the through hole and the guide cylinder are coaxially arranged.

[0011] By adopting the above technical solution, the pressure plate has a through hole for the lower end of the drill rod to pass through. The through hole and the guide cylinder are coaxially arranged, which ensures the normal alignment of the alignment component and the accurate alignment of the drill rod with the strain gauge during the drilling process. This avoids measurement errors caused by offset and improves the accuracy of residual stress detection in blind holes.

[0012] Preferably, the guide ear plates are provided in multiple ways and distributed around the axis of the guide cylinder, and the adjusting component includes an adjusting ring threaded onto the guide cylinder, with a rotating groove on the lower end face of the adjusting ring for the upper end of the guide rod to slide.

[0013] By adopting the above technical solution, setting multiple guide ears and distributing them around the axis of the guide cylinder, the stability of the guide rod in different directions can be ensured and deviation can be prevented. By rotating the adjusting ring, the adjusting ring can slide relative to the guide cylinder along the axial direction, thereby realizing the sliding adjustment of the pressure plate.

[0014] Preferably, the adjusting member further includes a spring sleeved on the upper part of the guide rod, one end of the spring abutting against the lower end face of the adjusting ring, and the other end of the spring abutting against the guide ear plate.

[0015] By adopting the above technical solution, a spring is added to improve the smoothness of the guide rod's sliding and resetting.

[0016] Preferably, the cross-section of the rotating groove is T-shaped, and the upper end of the guide rod is fixedly connected to a slider that is slidably connected to the rotating groove.

[0017] Preferably, the outer peripheral wall of the adjusting ring has anti-slip texture.

[0018] By adopting the above technical solution, the outer peripheral wall of the adjusting ring is provided with anti-slip texture, which can increase the friction between the hand and the adjusting ring.

[0019] Preferably, the adsorption base is a magnetic base.

[0020] By adopting the above technical solution, magnetic feet can be used to quickly adsorb and fix the device onto the surface of the workpiece to be tested, thereby improving installation efficiency and stability.

[0021] In summary, this utility model has the following beneficial effects:

[0022] 1. During testing, first attach the strain gauge to the surface of the workpiece to be tested, place the alignment piece in the guide cylinder for centering, then attach the adsorption base to the surface of the workpiece to be tested, and adjust the sliding position of the guide rod by adjusting the adjustment piece so that the pressure plate is pressed against the strain gauge. Then, remove the alignment piece and insert the drill rod into the guide cylinder for drilling. The addition of the pressure plate improves the fixing effect of the strain gauge, thereby improving the detection accuracy of residual stress in blind holes.

[0023] 2. Adding an elastic pad between the pressure plate and the strain gauge can effectively buffer the vibration and impact force generated during drilling, reduce the risk of displacement or damage to the strain gauge due to uneven stress, and ensure that the strain gauge is always in a stable and reliable fixed state, thereby improving the accuracy and reliability of blind hole residual stress detection.

[0024] 3. Using magnetic feet allows for quick adsorption and fixation onto the surface of the workpiece to be tested, improving installation efficiency and stability. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of a drilling device for detecting residual stress in blind holes.

[0026] Figure 2 This is a schematic diagram of the connection structure of a tool microscope;

[0027] Figure 3 This is a structural schematic diagram of the adjusting component.

[0028] In the diagram, 1. Detection platform; 2. Guide cylinder; 21. Limiting groove; 22. Guide ear plate; 23. Guide rod; 231. Slider; 24. Pressure plate; 241. Through hole; 25. Elastic pad; 3. Adsorption base; 4. Tool microscope; 41. Positioning ring; 5. Drill rod; 51. Drill bit; 6. Adjusting component; 61. Adjusting ring; 62. Spring; 63. Rotating groove. Detailed Implementation

[0029] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0030] This application discloses a drilling device for detecting residual stress in blind holes, referring to... Figure 1 The test platform 1 includes a guide cylinder 2 and several adsorption feet 3 distributed around the axis of the guide cylinder 2. In this embodiment, there are three adsorption feet 3 and the adsorption feet 3 are magnetic feet. The adsorption feet 3 are adsorbed and fixed to the outer wall of the workpiece to be tested.

[0031] Reference Figure 1 , Figure 2The guide cylinder 2 is vertically arranged and houses an alignment member or a drill rod 5. In this embodiment, the alignment member is a tool microscope 4, and the tool microscope 4 or the drill rod 5 is inserted into the guide cylinder 2. The guide cylinder 2 is used for centering the tool microscope 4 and guiding the drilling of the drill rod 5. The outer peripheral wall of the drill rod 5 abuts against the inner peripheral wall of the guide cylinder 2, and the drill rod 5 can rotate relative to the guide cylinder 2. A drill bit 51 is fixedly connected to the lower end face of the drill rod 5, and the upper end of the drill rod 5 can be externally connected to an electric drill. A limiting groove 21 is coaxially formed on the upper part of the guide cylinder 2, and the limiting groove 21 extends to the upper end face of the guide cylinder 2. A positioning ring 41 is fixedly connected to the upper part of the tool microscope 4 by a set screw, and the positioning ring 41 is adapted to be inserted into the limiting groove 21.

[0032] Reference Figure 2 , Figure 3 The lower outer wall of the guide cylinder 2 is fixedly connected to a guide ear plate 22 located below the detection platform 1. Multiple guide ear plates 22 are provided and distributed around the axis of the guide cylinder 2. A guide rod 23 is slidably inserted through the guide ear plate 22, and the axis of the guide rod is parallel to the axis of the guide cylinder 2. A pressure plate 24 is fixedly connected to the lower end face of the guide rod 23. An elastic pad 25 that abuts against the strain gauge is fixedly connected to the lower end face of the pressure plate 24. The pressure plate 24 has a through hole 241 through which the lower end of the drill rod 5 passes. The through hole 241 is coaxially arranged with the guide cylinder 2.

[0033] The guide cylinder 2 is equipped with an adjusting component 6 for adjusting the sliding position of the guide rod 23. The adjusting component 6 includes an adjusting ring 61 and a spring 62. The adjusting ring 61 is located between the guide ear plate 22 and the detection platform 1. The adjusting ring 61 is threaded onto the guide cylinder 2, and its outer peripheral wall has anti-slip texture. The lower end face of the adjusting ring 61 has a rotating groove 63 for the upper end of the guide rod 23 to slide. The rotating groove 63 has a T-shaped cross-section. The upper end of the guide rod 23 is fixedly connected to a slider 231 that is slidably connected to the rotating groove 63. The slider 231 is a T-shaped block. The spring 62 is sleeved on the upper part of the guide rod 23. One end of the spring 62 abuts against the lower end face of the adjusting ring 61, and the other end of the spring 62 abuts against the upper end face of the guide ear plate 22.

[0034] The implementation principle of the drilling device for detecting residual stress in blind holes according to an embodiment of this application is as follows: During the test, the strain gauge is first attached to the surface of the workpiece to be tested. After centering the tool microscope 4 in the guide cylinder 2, the adsorption base 3 is adsorbed and fixed on the surface of the workpiece to be tested. By rotating the adjusting ring 61, the adjusting ring 61 moves downward relative to the guide cylinder 2, thereby driving the pressure plate 24 to move downward through the guide rod 23, so that the elastic pad 25 is pressed against the strain gauge. Then, the tool microscope 4 is pulled out and the drill rod 5 is inserted into the guide cylinder 2. The drill rod 5 is rotated by the electric drill to perform the drilling operation.

[0035] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A blind hole residual stress detection drilling device characterized by: Including detection platform (1), detection platform (1) fixedly passes through the guide cylinder (2) and several adsorption foot bases (3) distributed around the guide cylinder (2) axis, adsorption foot base (3) is adsorbed and fixed to the outer wall of the workpiece to be measured, the guide cylinder (2) is placed with alignment piece or drill rod (5), the outer wall of the guide cylinder (2) is fixedly connected with the guide lug (22), the guide lug (22) is slidably provided with the guide rod (23), the axial direction of the guide rod is parallel to the axial direction of the guide cylinder (2), the guide rod (23) is fixedly connected with the pressing plate (24) abutting the strain rosette, the guide cylinder (2) is provided with the adjusting member (6) for adjusting the sliding position of the guide rod (23).

2. The blind hole drilling apparatus for blind hole residual stress measurement according to claim 1, characterized in that: The pressing plate (24) is provided with an elastic pad (25) abutting the strain rosette.

3. The blind hole drilling apparatus for blind hole residual stress measurement according to claim 1, characterized in that: The pressing plate (24) is provided with a through hole (241) for the lower end of the drill rod (5) to pass through, and the through hole (241) and the guide cylinder (2) are coaxially arranged.

4. The blind hole drilling apparatus for residual stress measurement of claim 1, wherein: The guide lug (22) is provided with a plurality of guide lugs (22) distributed around the axis of the guide cylinder (2), and the adjusting member (6) includes an adjusting ring (61) sleeved on the guide cylinder (2), and the lower end surface of the adjusting ring (61) is provided with a rotating groove (63) for the upper end of the guide rod (23) to slide.

5. The blind hole drilling apparatus for residual stress measurement of claim 4, wherein: The adjusting member (6) further includes a spring (62) sleeved on the upper portion of the guide rod (23), one end of the spring (62) abuts against the lower end surface of the adjusting ring (61), and the other end of the spring (62) abuts against the guide lug (22).

6. The blind hole drilling apparatus for residual stress measurement of claim 4, wherein: The cross section of the rotating groove (63) is T-shaped, and the upper end of the guide rod (23) is fixedly connected with a sliding block (231) slidably connected to the rotating groove (63).

7. The blind hole drilling apparatus for residual stress measurement of claim 4, wherein: The outer peripheral wall of the adjusting ring (61) has an anti-slip pattern.

8. The blind hole drilling apparatus for residual stress measurement of claim 1, wherein: The adsorption foot base (3) is a magnetic adsorption foot base.

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