Adjusting device for making fatigue crack and mechanical fatigue crack making device

Abstract

The invention provides an adjusting device for forming fatigue cracks and a mechanical fatigue crack manufacturing device.The adjusting device comprises a workbench, an adjusting pedestal, at least one workpiece support, two baffles and a horizontal adjusting part, and the workbench is used for installing the adjusting pedestal and the horizontal adjusting part; the adjusting pedestal is arranged on the workbench, and the horizontal relative position of the adjusting pedestal and the workbench can be adjusted; the workpiece support is arranged on the upper end face of the adjusting pedestal and used for supporting a workpiece. The two baffles are arranged on the upper end face of the adjusting pedestal, located on the two sides of the workpiece support and used for clamping and fixing a workpiece from the two sides. The horizontal adjusting part is arranged on the workbench and used for adjusting the horizontal position of the adjusting pedestal, and therefore the horizontal position of the workpiece is adjusted. According to the adjusting device for forming the fatigue crack, the crack trend can be controlled, then the growth direction and length of the crack can be controlled, and control over the growth angle, radian and morphology of the crack is achieved.

Description

Technical Field

[0001] The invention relates to the field of material processing, and in particular to an adjusting device for opening fatigue cracks and a mechanical fatigue crack making device. Background Art

[0002] According to the relevant requirements of Volume XI of the American ASME Code, during the in-service inspection of key nuclear island equipment such as the inlet and outlet pipes of the reactor pressure vessel and the main pipeline of a nuclear power plant, it is necessary to use blind test capability verification test blocks with natural defects to verify the reliability of the developed in-service inspection technology. The production of crack verification test blocks with natural defects is a prerequisite for carrying out equipment capability verification work.

[0003] In previous crack opening technologies, mechanical cutting, electric spark or extrusion molding methods are usually used to simulate cracks generated in pipelines. The cracks produced are usually regular processed reflectors. Compared with natural defects such as stress corrosion cracks generated in pipelines in the service environment of nuclear power units, there are significant differences in crack morphology and defect signal response during ultrasonic inspection.

[0004] Artificially processed specification crack defects will lead to large deviations in nondestructive testing errors and the ultimate bursting pressure of cracked pipes, which cannot provide reliable input parameters for accurately formulating defect acceptance criteria and will also cause great trouble to inspectors in judging the ultrasonic signal morphology.

[0005] In the prior art, mechanical cutting, electric spark or extrusion molding methods are usually used to make pipe cracks, and the cracks produced are mainly regular processing cracks. Compared with the natural cracks produced by pipelines in the field service environment, there are significant differences, and it is impossible to effectively simulate the true morphology of natural defects such as stress corrosion cracks produced by pipelines during the in-service inspection stage of nuclear power pipelines, and it is also impossible to meet the requirements for the production of natural defects in the performance verification test blocks in the mandatory Appendix VIII of Volume XI of the ASME Code.

[0006] In view of this, the inventor of the present application has designed an adjustment device for opening fatigue cracks and a mechanical fatigue crack production device in order to overcome the above technical problems. Summary of the invention

[0007] The technical problem to be solved by the present invention is to overcome the defect that the cracks produced by crack opening in the prior art are mainly regular processing cracks, which are greatly different from the natural cracks produced in the pipeline in the field service environment, and to provide an adjustment device for opening fatigue cracks and a mechanical fatigue crack production device.

[0008] The present invention solves the above technical problems through the following technical solutions:

[0009] The present invention provides an adjustment device for opening fatigue cracks, which is characterized in that the adjustment device comprises a workbench, an adjustment base, at least one workpiece support, two baffles and a horizontal adjustment part, the workbench is used to install the adjustment base and the horizontal adjustment part; the adjustment base is arranged on the workbench, and the horizontal relative position of the adjustment base and the workbench is adjustable; the workpiece support is arranged on the upper end surface of the adjustment base to support the workpiece; the two baffles are arranged on the upper end surface of the adjustment base, located on both sides of the workpiece support, and are used to clamp and fix the workpiece from both sides; the horizontal adjustment part is arranged on the workbench to adjust the horizontal position of the adjustment base, thereby adjusting the horizontal position of the workpiece.

[0010] According to one embodiment of the present invention, the horizontal adjustment part includes: a horizontal lateral adjustment component and a horizontal longitudinal adjustment component; the horizontal lateral adjustment component includes an X-axis motor, a first screw, a first bearing and a first bearing seat, which are used to adjust the horizontal lateral position of the adjustment platform; the horizontal longitudinal adjustment component includes a Y-axis motor, a second screw, a second bearing and a second bearing seat, which are used to adjust the horizontal longitudinal position of the adjustment platform.

[0011] According to an embodiment of the present invention, a scale ruler is provided on the adjustment base.

[0012] According to one embodiment of the present invention, backing plates are detachably provided on the two baffles.

[0013] According to one embodiment of the present invention, the height and horizontal mounting position of the workpiece support on the adjustment base are adjustable.

[0014] According to one embodiment of the present invention, each of the workpiece supports includes a support seat and a round rod-shaped support head, the support head is installed in the support seat, the workpiece contacts the support head up and down, and the contact surface between the workpiece and the support head is an arc surface.

[0015] According to one embodiment of the present invention, each of the workpiece supports includes a support seat and a support head, the support head is installed in the support seat, the workpiece contacts the support head from top to bottom, and the contact surface between the workpiece and the support head is a plane.

[0016] According to an embodiment of the present invention, the workpiece support is detachably connected to the adjustment base.

[0017] According to one embodiment of the present invention, the adjustment device further comprises a control system, the X-axis motor and the Y-axis motor are connected to the control system, and the horizontal position of the adjustment platform can be controlled by the control system.

[0018] The present invention also provides a mechanical fatigue crack making device, which is characterized in that the making device includes an adjustment device for opening fatigue cracks as described in any one of claims 1-9, and the making device also includes a pressure head, which is suspended above the workbench and is used to apply downward pressure to the workpiece when opening fatigue cracks.

[0019] According to one embodiment of the present invention, the manufacturing device also includes a detection system, which includes a force detection system and a video monitoring system. The force detection system is used to detect the force conditions of the two workpiece supports and the pressure head; the video monitoring system is used to monitor the preparation conditions of the cracks.

[0020] The positive and progressive effects of the present invention are:

[0021] The fatigue crack forming adjustment device and mechanical fatigue crack forming device of the present invention have a horizontal adjustment part, which can control the contact force position between the pressure head and the workpiece during the fatigue crack forming process to control the crack direction, and then control the crack growth direction and length, thereby realizing the control of the crack extension angle, arc and morphology, and can effectively simulate the natural morphology of cracks in the pipeline weld of a nuclear power plant in service. The natural crack insert formed has been verified by non-destructive testing methods such as ultrasonic waves, reaching the advanced technical level abroad. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and other features, properties and advantages of the present invention will become more apparent through the following description in conjunction with the accompanying drawings and embodiments, in which the same reference numerals always represent the same features, wherein:

[0023] Figure 1 The figure is a schematic diagram of the adjusting device for opening fatigue cracks according to the present invention.

[0024] Figure 2A A schematic front view of a baffle plate provided with a backing plate on the adjusting device for opening fatigue cracks according to the present invention.

[0025] Figure 2B A schematic side view of a baffle plate provided with a backing plate on the adjustment device for opening fatigue cracks according to the present invention.

[0026] Figure 3 This is a schematic diagram of the operation of the adjusting device for forming fatigue cracks in a workpiece with a special structure.

[0027] [Reference Signs]

[0028] Workbench 100

[0029] Workpiece support 200

[0030] First workpiece support 200L

[0031] Second workpiece support 200R

[0032] Support seat 210

[0033] Support head 220

[0034] Baffle 300

[0035] Pad 310

[0036] Bolt 320

[0037] Side wall 330

[0038] Horizontal adjustment unit 400

[0039] Horizontal lateral adjustment assembly 410

[0040] X-axis motor 411

[0041] First lead screw 412

[0042] First hand wheel 413

[0043] Control Panel 414

[0044] Horizontal and longitudinal adjustment assembly 420

[0045] Second lead screw 421

[0046] Second hand wheel 422

[0047] Adjustable stand 500

[0048] Scale ruler 510

[0049] Workpiece 600

[0050] Workpiece 600'

[0051] Crack guide groove 610

[0052] Press head 700

[0053] Base 800

[0054] Flange 810

[0055] Positioning pin 811

[0056] Stand 820 DETAILED DESCRIPTION

[0057] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0058] Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Reference will now be made in detail to preferred embodiments of the present invention, examples of which are shown in the accompanying drawings. Wherever possible, the same reference numerals will be used throughout the drawings to represent the same or similar parts.

[0059] Furthermore, although the terms used in the present invention are selected from well-known and commonly used terms, some terms mentioned in the present invention specification may be selected by the applicant at his or her discretion, and their detailed meanings are explained in the relevant parts of the description of this document.

[0060] Furthermore, it is required that the present invention be understood not only by the actual terms used but also by the meanings connoted by each term.

[0061] like Figure 1 As shown, the present invention provides an adjustment device for opening fatigue cracks, the adjustment device comprises a workbench 100, an adjustment base 500, at least one workpiece support 200, two baffles 300 and a horizontal adjustment part 400. The workbench 100 is used to install the adjustment base 500 and the horizontal adjustment part 400.

[0062] The adjustment pedestal 500 is arranged on the workbench 100, and the horizontal relative position of the adjustment pedestal 500 and the workbench 100 is adjustable. The workpiece support 200 is arranged on the upper end surface of the adjustment pedestal 500 to support the workpiece 600 from below. Two baffles 300 are arranged on the upper end surface of the adjustment pedestal 500 outside the workpiece support 200 to clamp and fix the workpiece 600 from both sides.

[0063] The horizontal adjustment part 400 is disposed on the workbench 100 to adjust the horizontal position of the adjustment base 500, thereby adjusting the horizontal position of the workpiece 600. The connection between the workpiece support 200 and the adjustment base 500 can preferably be threaded. The baffle 300 and the adjustment base 500 can be connected by bolts.

[0064] When in use, the workpiece 600 having the crack guiding groove 610 is first placed on the workpiece support 200 to support the workpiece 600. The two baffles 300 clamp the workpiece 600 from both sides, thereby fixing the workpiece 600.

[0065] Then, the horizontal adjustment part 400 is controlled to adjust the horizontal position of the adjustment base 500, so as to control the workpiece 600 to move to the desired position for fatigue crack opening. The horizontal adjustment part 400 can adopt existing conventional mechanical structures such as a slide rail device, a lead screw device, etc.

[0066] During the opening process of the fatigue crack, the pressing head 700 contacts the workpiece 600 from top to bottom and applies pressure to the workpiece 600 . The contact position between the pressing head 700 and the workpiece 600 is A.

[0067] Figure 1 In the illustrated embodiment, there are two workpiece supports 200, and each workpiece support 200 and the workpiece 600 have a supporting position respectively: position B and position C. The two workpiece supports 200 provide support for the workpiece 600 at the position in contact with the workpiece 600. Due to the reaction force, the two workpiece supports 200 generate a force from bottom to top on the workpiece 600 at position B and position C.

[0068] Since the workpiece 600 is simultaneously subjected to forces at three upper and lower positions A, B, and C, a crack is generated in the workpiece 600 at the crack guide groove 610. In the process of generating the crack, the horizontal position of the adjustment pedestal 500 is adjusted by controlling the horizontal adjustment part 400, so that the position A where the pressure head 700 and the workpiece 600 contact and apply force changes, the crack direction can be controlled, and then the crack growth direction and length can be controlled, thereby realizing the control of the crack extension angle, curvature and morphology.

[0069] The adjustment device for opening fatigue cracks provided by the present invention overcomes the shortcomings of existing crack manufacturing technologies, has the ability to open complex cracks, can preform complex cracks on metal materials, and can meet the technical requirements for crack opening.

[0070] Since the adjustment device for opening fatigue cracks provided by the present invention has a horizontal adjustment part 400, the position A where the pressure head 700 contacts and applies force to the workpiece 600 can be controlled during the process of opening fatigue cracks to control the direction of the cracks, and then the direction and length of the crack growth can be controlled, thereby achieving the control of the crack extension angle, arc and morphology, and effectively simulating the natural morphology of cracks in the pipeline weld of a nuclear power plant in service. The natural crack inserts opened have been verified by non-destructive testing methods such as ultrasonic waves, reaching the advanced technical level abroad.

[0071] like Figure 1 As shown, as a preferred embodiment of the adjustment device for opening fatigue cracks of the present invention, the horizontal adjustment part 400 includes: a horizontal transverse adjustment component 410 and a horizontal longitudinal adjustment component 420. Among them, the horizontal transverse adjustment component 410 includes an X-axis motor 411, a first screw 412, a first bearing and a first bearing seat, which are used to adjust the horizontal transverse position of the adjustment platform 500. The connection and installation method of the X-axis motor 411, the first screw 412, the first bearing and the first bearing seat is a conventional connection form already existing in the mechanical field.

[0072] The two first bearings are sleeved at both ends of the first lead screw 412, the first bearings are arranged in the first bearing seat, the first bearing seat is fixed on the workbench 100, the lower part of the adjustment pedestal 500 is connected to the first lead screw 412, and the horizontal transverse position of the adjustment pedestal 500 can be moved with the axial rotation of the first lead screw 412. The rotating shaft of the X-axis motor 411 is connected to one side of the axial direction of the first lead screw 412, and the first lead screw 412 is driven by the X-axis motor 411 to rotate axially to adjust the horizontal transverse position of the adjustment pedestal 500.

[0073] The horizontal and longitudinal adjustment assembly 420 includes a Y-axis motor, a second lead screw 421 , a second bearing and a second bearing seat, and is used to adjust the horizontal and longitudinal position of the adjustment platform 500 .

[0074] The connection and installation method of the Y-axis motor, the second lead screw 421, the second bearing and the second bearing seat is a conventional connection form in the mechanical field. Two second bearings are sleeved at the two ends of the second lead screw 421, the second bearing is arranged in the second bearing seat, the second bearing seat is fixed on the workbench 100, and the horizontal transverse adjustment component 410 is connected to the second lead screw 421. With the axial rotation of the second lead screw 421, the horizontal longitudinal position of the horizontal transverse adjustment component 410 can be moved. The rotating shaft of the Y-axis motor is connected to one side of the axial direction of the second lead screw 421, and the second lead screw 421 is driven by the Y-axis motor to rotate axially to adjust the horizontal longitudinal position of the horizontal transverse adjustment component 410, thereby adjusting the horizontal longitudinal position of the adjustment base 500.

[0075] A first hand wheel 413 and a second hand wheel 422 may be provided on one axial side of the first lead screw 412 and one axial side of the second lead screw 421 , respectively, to facilitate manual adjustment of the horizontal position of the adjustment platform 500 .

[0076] A control panel 414 may also be installed on the workbench 100 , and the X-axis motor 411 and the Y-axis motor are electrically connected to the control panel 414 , so that the X-axis motor 411 and the Y-axis motor may be controlled through the control panel 414 .

[0077] The horizontal adjustment part 400 of the above-mentioned embodiment structure can control the position A where the pressure head 700 contacts and applies force with the workpiece 600 during the process of opening a fatigue crack, so as to control the direction of the crack, and then control the direction and length of crack growth, thereby achieving control of the crack propagation angle, curvature and morphology, and can effectively simulate the natural morphology of cracks in the pipeline welds of a nuclear power plant under service conditions.

[0078] like Figure 2A and Figure 2BAs shown, as a preferred embodiment of the adjustment device for opening fatigue cracks of the present invention, backing plates 310 are detachably provided on the two baffles 300 .

[0079] For example, the side wall 330 of the baffle 300 has a prefabricated hole, the backing plate 310 also has a through hole, and the baffle 300 and the backing plate 310 are connected by bolts 320 .

[0080] When the workpiece 600 is small, the baffle plate 300 alone cannot clamp the workpiece 600 from both sides, so a pad 310 is provided on the baffle plate 300 to reinforce the workpiece 600 .

[0081] As a preferred embodiment of the adjustment device for opening fatigue cracks of the present invention, the height and horizontal installation position of the workpiece support 200 on the adjustment base 500 are adjustable.

[0082] For example, the bottom of the workpiece support 200 is connected to the adjustment base 500 through a screw, and the height of the workpiece support 200 and the adjustment base 500 is adjusted by screwing the screw. The height adjustment mechanism can also be a hydraulic rod or the like.

[0083] For example, by setting a plurality of mounting holes at multiple locations on the adjustment base 500 and replacing the mounting holes of the workpiece support 200 on the adjustment base 500, the horizontal mounting position of the workpiece support 200 can be adjusted. The horizontal mounting position of the workpiece support 200 can also be adjusted by setting a slide rail structure on the adjustment base 500, and the bottom of the workpiece support 200 is movably connected to the slide groove of the slide rail structure, so that the workpiece support 200 can slide on the slide groove, and the workpiece support 200 is also provided with a threaded fastening device. When the workpiece support 200 slides to the desired position, the threaded fastening device fixes the workpiece support 200, so that the horizontal mounting position of the workpiece support 200 can be adjusted.

[0084] like Figure 3 As shown, there are two workpiece supports 200. Since the heights of the two workpiece supports 200 are adjustable, when the shape of the workpiece 600' is, for example, Figure 3 In the special-shaped structure, when clamping the workpiece 600', the height of one of the two workpiece supports 200, the first workpiece support 200L, remains unchanged, and the horizontal installation position of the first workpiece support 200L is adjusted to a suitable position for conveniently supporting the workpiece 600'. The height of the other second workpiece support 200R is raised, and the horizontal installation position of the second workpiece support 200R is adjusted to a suitable position for conveniently supporting the workpiece 600', so that the special-shaped lower surface of the workpiece 600' and the upper surface of the workpiece 600' remain relatively horizontal.

[0085] During the fatigue cracking process, the press head 700 applies pressure to the workpiece 600' at position A, and the first workpiece support 200L and the second workpiece support 200R support the workpiece 600' at the bottom position B and position C of the workpiece 600', respectively. Figure 3 The middle position C is higher than the position B to adapt to the irregular lower surface of the workpiece 600 ′. Since the workpiece 600 ′ is subjected to forces at the three positions A, B, and C, fatigue cracks are generated at the crack guide groove 610 .

[0086] Figure 3 The workpiece 600' with a special structure is shown as an embodiment only. Since the horizontal installation position and the height of the two workpiece supports 200 are adjustable, the adjustment device for opening fatigue cracks of the present invention can adapt to various shapes of special-shaped workpieces and has a certain versatility.

[0087] like Figure 1 As shown, as a preferred embodiment of the adjustment device for opening fatigue cracks of the present invention, a scale ruler 510 is provided on the adjustment base 500 .

[0088] The horizontal installation position of the workpiece support 200 can be accurately determined by the reading of the scale ruler 510, so that the contact position between the workpiece support 200 and the workpiece 600 can be accurately determined, and then the growth direction of the crack can be determined during the crack opening process.

[0089] like Figure 1 As shown, as a preferred embodiment of the adjustment device for opening fatigue cracks of the present invention, the workpiece support 200 includes a support seat 210 and a round rod-shaped support head 220, the support head 220 is installed in the support seat 210, the workpiece 600 contacts the support head 220 up and down, and the contact surface between the workpiece 600 and the support head 220 is an arc surface.

[0090] Arc surfaces as contact surfaces usually provide better wear resistance and withstand greater pressure. Due to the shape of the arc, the arc contact surface can better disperse the pressure, thereby reducing stress concentration.

[0091] As a preferred embodiment of the adjustment device for opening fatigue cracks of the present invention, the workpiece support 200 includes a support seat 210 and a support head, the support head is installed in the support seat 210, the workpiece 600 contacts the support head up and down, and the contact surface between the workpiece 600 and the support head is a plane.

[0092] For example, by using a rectangular or wedge-shaped support head, the contact surface between the workpiece 600 and the support head can be made flat.

[0093] The planar contact surface is easy to manufacture and process, and is also easier to install and adjust. In addition, the planar contact surface can more easily check the state of the contact surface, thereby replacing the support head 220 or repairing it.

[0094] As a preferred embodiment of the adjustment device for opening fatigue cracks of the present invention, the workpiece support 200 is detachably connected to the adjustment platform 500 .

[0095] For example, the workpiece support 200 and the adjustment base 500 are connected together by a screw, and the workpiece support 200 and the adjustment base 500 are detachable by the screw.

[0096] Since the workpiece support 200 is detachably connected to the adjustment base 500 , it is convenient to replace the workpiece support 200 with the support head 220 of different shapes and sizes, and it is also convenient to replace the damaged workpiece support 200 .

[0097] As a preferred embodiment of the adjustment device for producing fatigue cracks of the present invention, the adjustment device also has a base 800, the lower part of the base 800 is connected to the flange 810 by bolts, the flange 810 is connected to the mechanical fatigue crack production device by a positioning pin 811, and a stand 820 is provided on the base 800, and a workbench 100 is installed on the stand 820.

[0098] The adjustment device for making fatigue cracks in the above embodiment is connected to the mechanical fatigue crack making device via the bottom flange 810 with the positioning pin 811, so that the adjustment device can be disassembled and replaced conveniently, which is beneficial to saving production and processing costs.

[0099] As a preferred embodiment of the adjusting device for opening fatigue cracks of the present invention, the adjusting device for opening fatigue cracks also includes a control system, and the X-axis motor 411 and the Y-axis motor are connected to the control system, and the horizontal position of the adjustment platform 500 can be controlled by the control system.

[0100] The control system is used to control the X-axis motor 411 and the Y-axis motor to achieve precise control of the horizontal position of the adjustment base 500, thereby precisely controlling the direction of the crack, and then controlling the crack growth direction and length, thereby achieving control of the crack expansion angle, curvature and morphology, and effectively simulating the natural morphology of cracks in the pipeline weld of a nuclear power plant under service conditions.

[0101] The present invention also provides a mechanical fatigue crack making device, which includes the adjustment device for opening fatigue cracks in the above-mentioned embodiment, and also includes a pressing head 700, which is suspended above the workbench 100 and is used to apply downward pressure to the workpiece 600 when opening fatigue cracks.

[0102] Since the mechanical fatigue crack making device of the present invention includes the adjustment device for making fatigue cracks of the present invention, the horizontal adjustment part 400 of the adjustment device can control the crack direction during the process of making fatigue cracks, and then control the crack growth direction and length, thereby realizing the control of the crack extension angle, arc and morphology, and can effectively simulate the natural morphology of cracks in the pipeline weld of a nuclear power plant in service. The natural crack inserts made have been verified by non-destructive testing methods such as ultrasonic waves, reaching the advanced technical level abroad.

[0103] As a preferred embodiment of the mechanical fatigue crack making device of the present invention, the making device further comprises a detection system, and the detection system comprises a force detection system and a video monitoring system.

[0104] The force detection system is used to detect the force conditions of the workpiece support 200 and the pressure head 700;

[0105] The video monitoring system is used to monitor the preparation of cracks.

[0106] There are devices for monitoring force on the workpiece support 200 and the downward force-applying press head 700, which are electrically connected to the force detection system. The force detection system accurately controls the magnitude and frequency of the force according to the force conditions of the workpiece support 200 and the press head 700.

[0107] During the fatigue crack preparation process, the video monitoring device monitors the crack preparation status at any time, thereby controlling the movement of the adjustment platform 500, controlling the growth direction of the crack, adjusting the opening of the crack, and preparing cracks of different heights as required.

[0108] According to the above structural description, the steps of the fatigue crack preparation method using the mechanical fatigue crack preparation device are as follows:

[0109] Step S1, providing a sample blank, wherein the sample blank has a base surface, processing the surface of the sample blank to required external dimensions and surface finish, and making a crack guiding groove 610 on the sample blank to obtain a workpiece 600.

[0110] Step S2, the direction of the crack guiding groove 610 is downward, fixed on the device, and the position is adjusted so that the crack guiding groove 610 of the workpiece 600 is located at the center.

[0111] Step S3, adjust the position of the baffles 300 on both sides according to the length of the workpiece 600. After the workpiece 600 is installed, tighten it at a distance of 1 mm from the workpiece 600 to prevent the workpiece from slipping or shifting. When the workpiece 600 is small, install the pad 310 on the baffle 300.

[0112] Step S4, crack preparation begins, and the indenter 700 applies pressure downward.

[0113] Step S5, the force application detection system detects the force conditions of the workpiece support 200 and the indenter 700, and precisely controls the magnitude and frequency of the force; the video monitoring device monitors the preparation condition of the crack at any time, so that h < H (the crack depth h is less than the height H of the workpiece 600).

[0114] Step S6, during the process of preparing the crack, the control adjustment base 500 is controlled to move in the X-axis and Y-axis directions, so as to control the direction of the crack.

[0115] The mechanical fatigue crack manufacturing device provided by the present invention can, according to needs, make cracks in sample workpieces of different shapes and sizes, and adjust the growth angle, radian and morphology of the sample cracks to form real fatigue cracks. In addition, the mechanical fatigue crack manufacturing device of the present invention has a control system and a detection system to detect the force conditions, so as to precisely control the magnitude and frequency of the force; monitor the preparation condition of the crack, and control the growth direction and length of the crack, which can not only ensure the controllability of crack making but also realize the generation of real fatigue cracks.

[0116] In summary, the adjustment device for making fatigue cracks and the mechanical fatigue crack manufacturing device of the present invention detect the force conditions of the workpiece support 200 and the indenter 700 and the preparation condition of the crack, and can cooperate with the horizontal adjustment part 400 of the adjustment device for making fatigue cracks to control the crack direction during the process of making fatigue cracks, and further control the growth direction and length of the crack, so as to realize the control of the crack expansion angle, radian and morphology, and can effectively simulate the natural morphology of cracks in the in-service state of nuclear power plant pipeline welds. The prepared natural crack blocks are verified by non-destructive testing methods such as ultrasonic waves, and reach the advanced technical level abroad.

[0117] Although the specific embodiments of the present invention have been described above, those skilled in the art should understand that these are only examples, and the protection scope of the present invention is defined by the appended claims. Without departing from the principle and essence of the present invention, those skilled in the art can make various changes or modifications to these embodiments, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A fatigue crack opening regulating device, characterized in that: The adjusting device comprises a workbench, an adjusting seat, at least one workpiece support, two baffles and a horizontal adjusting part. The workbench is used to install the adjustment base and the horizontal adjustment part; The adjustment seat is arranged on the workbench, and the horizontal relative position between the adjustment seat and the workbench is adjustable; The workpiece support is arranged on the upper end surface of the adjustment platform to support the workpiece; The two baffles are arranged on the upper end surface of the adjustment base, located on both sides of the workpiece support, and are used to clamp and fix the workpiece from both sides; The horizontal adjustment part is arranged on the workbench to adjust the horizontal position of the adjustment base, thereby adjusting the horizontal position of the workpiece.

2. The fatigue crack opening adjustment device according to claim 1, characterized in that: The horizontal adjustment part includes: a horizontal transverse adjustment component and a horizontal longitudinal adjustment component; The horizontal lateral adjustment assembly includes an X-axis motor, a first lead screw, a first bearing and a first bearing seat, which are used to adjust the horizontal lateral position of the adjustment platform; The horizontal and longitudinal adjustment assembly includes a Y-axis motor, a second lead screw, a second bearing and a second bearing seat, which are used to adjust the horizontal and longitudinal position of the adjustment platform.

3. The fatigue crack opening adjustment device according to claim 1, characterized in that: Pads are detachably provided on the two baffles.

4. The fatigue crack opening adjustment device according to claim 1, characterized in that: The height and horizontal mounting position of the workpiece support on the adjustment base are adjustable.

5. The fatigue crack opening adjustment device according to claim 1, characterized in that: The adjustment base is provided with a scale ruler.

6. The fatigue crack opening adjustment device according to claim 1, characterized in that: Each of the workpiece supports comprises a support seat and a round rod-shaped support head, wherein the support head is installed in the support seat, the workpiece contacts the support head up and down, and the contact surface between the workpiece and the support head is an arc surface.

7. The fatigue crack opening adjustment device according to claim 1, characterized in that: Each of the workpiece supports comprises a support seat and a support head, wherein the support head is installed in the support seat, the workpiece contacts the support head up and down, and the contact surface between the workpiece and the support head is a plane.

8. The fatigue crack opening adjustment device according to claim 1, characterized in that: The workpiece support is detachably connected to the adjustment base.

9. The fatigue crack opening adjustment device according to claim 2, characterized in that: The adjustment device also includes a control system, the X-axis motor and the Y-axis motor are connected to the control system, and the horizontal position of the adjustment platform can be controlled by the control system.

10. A mechanical fatigue crack making device, characterized in that: The manufacturing device includes the adjustment device for opening fatigue cracks as described in any one of claims 1 to 9, and the manufacturing device also includes a pressing head, which is suspended above the workbench and is used to apply downward pressure to the workpiece when opening fatigue cracks.

11. The mechanical fatigue crack making device according to claim 10, characterized in that: The production device also includes a detection system, which includes a force detection system and a video monitoring system. The force detection system is used to detect the force conditions of the two workpiece supports and the pressure head; The video monitoring system is used to monitor the preparation of cracks.

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