Blind hole method residual stress detection equipment

Abstract

The utility model relates to blind hole method residual stress detection equipment, which comprises a detection equipment body and a bottom shell fixedly connected to the bottom of the detection equipment body, a fixing part is arranged below the bottom shell, the inner top wall of the bottom shell is fixedly connected with a servo motor, the output end of the servo motor is in transmission connection with a driving rod, and the driving rod is in transmission connection with the detection equipment body. A driving gear fixedly sleeves the peripheral surface of the driving rod, an inner gear ring is fixedly connected in the bottom shell, a rotating disc is rotatably connected to the inner top wall of the bottom shell, the position, corresponding to the driving rod, of the top of the rotating disc is provided with an opening, a plurality of driven rods are rotatably connected to the bottom of the rotating disc, and driven gears fixedly sleeve the peripheral surfaces of the driven rods; and the driving gear and the inner gear ring are meshed with the driven gear. The utility model relates to the technical field of stress detection. According to the utility model, while the machining strain is obviously reduced and the stress detection precision is improved, the servo motor can ensure that the position of the drill bit is accurate and does not need to be repositioned, so that the use of an operator is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of stress detection, in particular to a blind hole method residual stress detection device. Background Art

[0002] Due to different manufacturing processes during the manufacturing process of mechanical parts, residual stress will be generated in the material. The existence of residual stress will reduce the strength of the workpiece, causing deformation and cracking during manufacturing. On the other hand, it will change the size of the workpiece or reduce its mechanical properties such as fatigue strength during the natural release process after manufacturing, thereby affecting their safety. The blind hole method is to stick a special strain rosette on the material, drill a hole in the center of the strain rosette, and cause stress release at the hole edge. The residual stress can be calculated based on the release strain measured by the strain rosette.

[0003] When using blind hole stress detection equipment to conduct stress detection tests, it is necessary to drill a small hole in the center of the stress sensing plate. However, when drilling, the tool cuts the metal and squeezes the hole wall, which will produce processing strain. This processing strain will affect the accuracy of residual stress detection. The traditional processing method is to drill a hole with a smaller diameter drill first, and then gradually use increasingly thicker drills to drill. This method can significantly reduce processing strain, but the blind hole method requires higher positioning accuracy. The above method needs to be repositioned after replacing the drill bit. The steps are cumbersome and inconvenient for operators to use. Utility Model Content

[0004] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a blind hole residual stress detection device, which is convenient for operators to use.

[0005] The above technical objectives of the utility model are achieved through the following technical solutions:

[0006] A blind hole residual stress detection device comprises a detection device body and a bottom shell fixedly connected to the bottom of the detection device body, a fixing portion is arranged below the bottom shell, a servo motor is fixedly connected to the inner top wall of the bottom shell, a driving rod is transmission-connected to the output end of the servo motor, a driving gear is fixedly sleeved on the outer circumference of the driving rod, an inner gear ring is fixedly connected inside the bottom shell, a turntable is rotatably connected to the inner top wall of the bottom shell, an opening is arranged at the top of the turntable corresponding to the driving rod, a plurality of driven rods are rotatably connected to the bottom of the turntable, a driven gear is fixedly sleeved on the outer circumference of the driven rod, the driving gear and the inner gear ring are both meshed with the driven gear, and a drilling portion is arranged below the driven gear.

[0007] Through the above technical solution, through the cooperation of the servo motor, internal gear ring, turntable, driven gear and drilling part, when the device is fixed on the workpiece to be detected and the servo motor is driven to work, the same position of the workpiece can be drilled multiple times without the need for multiple positioning, which facilitates the use of the operator.

[0008] In a preferred example, the present utility model can be further configured as follows: the drilling part includes a sealing shell fixedly connected to the bottom of the driven gear. The top of the sealing shell is open, and a plurality of vertical rods are fixedly connected between the driven gear and the inner bottom wall of the corresponding sealing shell. A slide plate is slidably connected to the outer circumferential surfaces of the plurality of vertical rods. A driving motor is fixedly connected to the bottom of the slide plate. The output end of the driving motor is drivingly connected to a drill bit. The drill bit is threadedly connected to the corresponding sealing shell. An annular opening is formed at the bottom of the bottom shell corresponding to the drill bit, and the drill bit extends below the bottom shell through the annular opening.

[0009] Through the above technical solution, through the cooperation of the slide plate, drill bit, vertical rod, driving motor and sealing shell, when the driving motor works, the drill bit rotates and moves vertically at the same time, so as to realize drilling.

[0010] In a preferred example, the present utility model can be further configured as follows: the plurality of drill bits are arranged in a uniformly annular manner, and along the circumferential direction, the diameters of the plurality of drill bits gradually increase.

[0011] Through the above technical solution, when the servo motor works, the plurality of drill bits move to the drilling position in sequence according to the diameter size, so that the blind hole is gradually enlarged, thereby reducing the processing strain.

[0012] In a preferred example, the present utility model can be further configured as follows: the fixing part includes a plurality of vacuum suckers fixedly connected to the bottom of the bottom shell. A vacuum generator is arranged on the side wall of the bottom shell, and the output end of the vacuum generator is communicated with the corresponding vacuum sucker.

[0013] Through the above technical solution, through the cooperation of the vacuum sucker and the vacuum generator, the device can be more conveniently fixed on the workpiece, preventing the device from shaking during drilling, and further facilitating the use of the operator.

[0014] In summary, the present utility model includes at least one of the following beneficial technical effects:

[0015] 1. Through the cooperation of a servo motor, an internal gear ring, a turntable, a driven gear, and a drill bit, in the initial state, align the drill bit with the smallest diameter with the position on the workpiece where drilling is required. Then start the vacuum generator to fix this device on the workpiece. After drilling is completed, start the servo motor to move the drill bit with a slightly larger diameter to the blind hole to expand the blind hole. In this way, several drill bits work in sequence, significantly reducing the machining strain and improving the stress detection accuracy. At the same time, the servo motor can ensure the accurate position of the drill bit, eliminating the need for repositioning and facilitating the use of the operator.

[0016] 2. Through the cooperation of a slide plate, a drill bit, a vertical rod, a driving motor, and a sealing shell, when the driving motor works, it drives the drill bit to rotate and move vertically at the same time, thus realizing drilling. There is no need for the operator to press down this device, reducing the labor intensity of the operator. Description of the Drawings

[0017] Figure 1 is the overall structural schematic diagram of this embodiment;

[0018] Figure 2 is this embodiment Figure 1 the enlarged view of part A;

[0019] Figure 3 is the lower sectional view of this embodiment.

[0020] In the figure, 1, the detection equipment body; 2, the bottom shell; 3, the fixing part; 31, the vacuum suction cup; 32, the vacuum generator; 4, the servo motor; 5, the driving gear; 6, the internal gear ring; 7, the turntable; 8, the driven rod; 9, the driven gear; 10, the drilling part; 101, the sealing shell; 102, the vertical rod; 103, the slide plate; 104, the driving motor; 105, the drill bit; 11, the annular opening. Detailed Description of the Embodiment

[0021] The following further describes the present utility model in detail with reference to the drawings.

[0022] Embodiment:

[0023] Referring to Figures 1 to 3 , a residual stress detection device by the blind hole method disclosed by the present utility model includes a detection equipment body 1 and a bottom shell 2 fixedly connected to the bottom of the detection equipment body 1. A fixing part 3 is arranged below the bottom shell 2. The detection equipment body 1 is the prior art. A special strain rosette is pasted on the workpiece, a hole is drilled in the center of the strain rosette to cause stress release at the hole edge, and the detection equipment body 1 can calculate the residual stress according to the released strain measured by the strain rosette.

[0024] The fixing part 3 includes a plurality of vacuum suction cups 31 fixedly connected to the bottom of the bottom shell 2. A vacuum generator 32 is arranged on the side wall of the bottom shell 2, and the output end of the vacuum generator 32 is communicated with the corresponding vacuum suction cup 31. The vacuum suction cup 31 is attached to the surface of the workpiece, and then the vacuum generator 32 is started, so that the vacuum suction cup 31 can be tightly connected to the workpiece, thereby fixing the device on the surface of the workpiece.

[0025] A servo motor 4 is fixedly connected to the inner top wall of the bottom shell 2. The output end of the servo motor 4 is drivingly connected with a driving rod, and a driving gear 5 is fixedly sleeved on the outer peripheral surface of the driving rod. An internal gear ring 6 is fixedly connected inside the bottom shell 2, and a turntable 7 is rotatably connected to the inner top wall of the bottom shell 2. The top of the turntable 7 is provided with an opening corresponding to the driving rod, and the turntable 7 is not in contact with the driving rod.

[0026] A plurality of driven rods 8 are rotatably connected to the bottom of the turntable 7. A driven gear 9 is fixedly sleeved on the outer peripheral surface of the driven rod 8. Both the driving gear 5 and the internal gear ring 6 are meshed with the driven gear 9. When the servo motor 4 works to drive the driving rod to rotate, the driving rod drives the driving gear 5 to rotate. Under the cooperation of the driving gear 5 and the internal gear ring 6, the driven gear 9 rotates while revolving around the center of the driving gear 5. The plurality of driven gears 9 drive the turntable 7 to move stably.

[0027] A drilling part 10 is arranged below the driven gear 9. The drilling part 10 includes a sealing shell 101 fixedly connected to the bottom of the driven gear 9. The top of the sealing shell 101 is provided with an opening, and a plurality of vertical rods 102 are fixedly connected between the driven gear 9 and the inner bottom wall of the corresponding sealing shell 101. A sliding plate 103 is slidably connected to the outer peripheral surfaces of the plurality of vertical rods 102 together.

[0028] A driving motor 104 is fixedly connected to the bottom of the sliding plate 103. The output end of the driving motor 104 is drivingly connected with a drill bit 105, and the drill bit 105 is threadedly connected to the corresponding sealing shell 101. An annular opening 11 is formed in the bottom of the bottom shell 2 corresponding to the drill bit 105, and the drill bit 105 passes through the annular opening 11 and extends below the bottom shell 2.

[0029] When the driving motor 104 works to drive the drill bit 105 to rotate, since the drill bit 105 is threadedly connected to the sealing shell 101 and the sealing shell 101 cannot move, the sliding plate 103 and the driving motor 104 move downward synchronously, so that the drill bit 105 rotates and moves downward at the same time, drilling into the surface of the workpiece, thereby realizing drilling.

[0030] A number of drill bits 105 are arranged in a uniform circular pattern. Along the circumferential direction, the diameters of the number of drill bits 105 gradually increase. Further, the number of drill bits 105 is three, and the diameters of the three drill bits 105 are 5 mm, 10 mm, and 15 mm respectively. Each time the servo motor 4 operates, it drives the turntable 7 to rotate 120°, so that the 10-mm drill bit 105 moves to the position of the original 5-mm drill bit 105, thus realizing automatic positioning.

[0031] The implementation principle of the above embodiment is as follows:

[0032] Place this device on the surface of the workpiece, align the drill bit 105 with the smallest diameter with the position where drilling is required, and then start the vacuum generator 32 to work, so that the vacuum chuck 31 is tightly connected to the workpiece, thereby fixing this device on the surface of the workpiece. Then start the corresponding drive motor 104 to work. The drive motor 104 drives the drill bit 105 to rotate. Since the drill bit 105 is threadedly connected to the sealing shell 101 and the sealing shell 101 cannot move, the slide plate 103 moves downward synchronously with the drive motor 104. Thus, the drill bit 105 rotates while moving downward and drills into the surface of the workpiece, thereby realizing drilling. Then this drive motor 104 works in the reverse direction to make the drill bit 105 return to its original position.

[0033] Next, start the servo motor 4 to work, drive the drive rod to rotate, the drive rod drives the drive gear 5 to rotate. Under the cooperation of the drive gear 5 and the internal gear ring 6, the driven gear 9 rotates while revolving around the center of the drive gear 5. Driven by a number of driven gears 9, the turntable 7 moves stably. The driven gear 9 drives the drill bit 105 to move, so that the drill bit 105 with a larger diameter moves to the drilling position. Then start the corresponding drive motor 104 to work and continue to drill the workpiece. After drilling is completed, start the servo motor 4 to work again, so that each drill bit 105 works in sequence according to the diameter from small to large, reducing the processing strain generated during drilling and improving the detection accuracy of residual stress.

[0034] Finally, the residual stress of the workpiece is detected by the detection device body 1.

[0035] The embodiments of this specific implementation manner are all preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A blind hole residual stress detection device, comprising a detection device body (1) and a bottom shell (2) fixedly connected to the bottom of the detection device body (1), characterized in that: A fixing portion (3) is provided below the bottom shell (2); a servo motor (4) is fixedly connected to the inner top wall of the bottom shell (2); a driving rod is drivingly connected to the output end of the servo motor (4); a driving gear (5) is fixedly sleeved on the outer circumference of the driving rod; an inner gear ring (6) is fixedly connected inside the bottom shell (2); a rotating disk (7) is rotatably connected to the inner top wall of the bottom shell (2); an opening is provided at the top of the rotating disk (7) corresponding to the driving rod; a plurality of driven rods (8) are rotatably connected to the bottom of the rotating disk (7); a driven gear (9) is fixedly sleeved on the outer circumference of the driven rod (8); the driving gear (5) and the inner gear ring (6) are both meshed with the driven gear (9); and a drilling portion (10) is provided below the driven gear (9).

2. The blind hole residual stress detection device according to claim 1, characterized in that: The drilling portion (10) comprises a sealing shell (101) fixedly connected to the bottom of the driven gear (9); the sealing shell (101) is provided with an opening at the top; a plurality of vertical rods (102) are fixedly connected between the driven gear (9) and the corresponding inner bottom wall of the sealing shell (101); a slide plate (103) is slidably connected to the outer peripheral surfaces of the corresponding plurality of vertical rods (102); a driving motor (104) is fixedly connected to the bottom of the slide plate (103); a drill bit (105) is drivingly connected to the output end of the driving motor (104); the drill bit (105) is threadedly connected to the corresponding sealing shell (101); an annular opening (11) is provided at the bottom of the bottom shell (2) corresponding to the drill bit (105); the drill bit (105) passes through the annular opening (11) and extends to the bottom of the bottom shell (2).

3. The blind hole residual stress detection device according to claim 2, characterized in that: The plurality of drill bits (105) are evenly arranged in a ring shape, and the diameters of the plurality of drill bits (105) gradually increase along the circumferential direction.

4. The residual stress detection device using the blind hole method according to claim 3 is characterized in that: The fixing portion (3) comprises a plurality of vacuum suction cups (31) fixedly connected to the bottom of the bottom shell (2); a vacuum generator (32) is arranged on the side wall of the bottom shell (2); an output end of the vacuum generator (32) is connected to the corresponding vacuum suction cups (31).

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