Stress relieving device for fracture toughness test

Abstract

The embodiment of the invention provides a stress relieving device for a fracture toughness test. The stress relieving device comprises a plurality of guide columns, a base assembly, a top seat assembly, a first pressing block and a second pressing block, the multiple guide columns are arranged on the edge area of the base assembly at intervals, and a first pressing block is arranged in the center area of the base assembly. The top seat assembly can slide in the direction from the second ends to the first ends of the guide columns along the guide columns, and the top seat assembly is provided with second pressing blocks corresponding to the first pressing blocks; the side, facing the top seat assembly, of the base assembly is used for bearing a sample weldment and hammering the sample weldment under the cooperative action of the first pressing block and the second pressing block so as to eliminate residual stress of the sample weldment and enable the sample weldment to generate indentations. By means of the guide column, the base assembly, the top base assembly, the first pressing block and the second pressing block, a weld joint and an adjacent area of a sample weldment can be effectively hammered, residual stress of the sample weldment is eliminated, and the indentation depth is accurately controlled through cooperation of the first pressing block and the second pressing block.

Description

Technical Field

[0001] The embodiments of the present disclosure belong to the field of welding processing technology, and specifically relate to a stress relief device for fracture toughness testing. Background Art

[0002] During the welding process, the thermal stress, phase change stress, processing stress, etc. of the weldment exceed the yield limit, resulting in unrelieved stress remaining in the weldment after cooling. In the fracture toughness test, fatigue crack prefabrication is required for the weldment in advance, but due to the large residual stress inside the weld structure, the straightness of the fatigue crack front cannot be guaranteed.

[0003] The wall thickness of commonly used fracture toughness specimens ranges from about 10mm to 40mm. The fracture toughness standard requires that the indentation depth is only 0.5% of the thickness (i.e., about 0.05mm to 0.2mm). When prefabricating the weldment with indentation, the weldment has unrelieved stress, so it is impossible to accurately control the indentation thickness. In view of this, the inventors have designed a stress relief device that effectively reduces welding residual stress through local compression and accurately controls the indentation thickness. Summary of the invention

[0004] The embodiments of the present disclosure aim to solve at least one of the technical problems existing in the prior art and provide a stress relief device for fracture toughness testing.

[0005] An embodiment of the present disclosure provides a stress relief device for fracture toughness testing, the stress relief device comprising a plurality of guide posts, a base assembly, a top assembly, a first pressing block, and a second pressing block;

[0006] A plurality of guide posts are arranged at intervals at the edge area of ​​the base assembly, and a first end of each guide post is fixedly connected to the base assembly, and a first pressing block is arranged at the central area of ​​the base assembly on a side facing the top seat assembly;

[0007] The top seat assembly is supported on the second ends of the plurality of guide pillars, and the top seat assembly can slide along the plurality of guide pillars from the second ends thereof to the first ends thereof, and a second pressing block corresponding to the first pressing block is provided on the side of the top seat assembly facing the base assembly; wherein,

[0008] The side of the base assembly facing the top seat assembly is used to support the sample weldment. When the top seat assembly slides from the second end of the plurality of guide pillars to the first end thereof, the first pressing block and the second pressing block cooperate to hammer the sample weldment to eliminate the residual stress of the sample weldment and produce an indentation on the sample weldment.

[0009] Optionally, the base assembly includes a base and a pad structure;

[0010] The base is provided with a plurality of fixing holes along its edge area, and the fixing holes are used to fix and connect the first ends of the corresponding guide pillars;

[0011] The pad structure is located on a side of the base facing the top seat assembly, and the side of the pad structure facing the top seat assembly is used to support the sample weldment.

[0012] Optionally, the pad structure includes a sample pad and a first connecting seat, and a first connecting groove is formed on a side of the base facing the top seat assembly;

[0013] The sample pad is located on the side of the base facing the top seat assembly, and the side of the sample pad facing the top seat assembly is used to support the sample weldment;

[0014] The first connection seat is fixedly connected to the side of the sample pad facing the base, and the first connection seat is clamped in the first connection through groove to fix the sample pad and the base.

[0015] Optionally, the top seat assembly includes a top seat and a pressure plate structure;

[0016] The top seat is provided with a plurality of guide holes along its edge region, and the guide holes are used for sliding connection with the second ends of the corresponding guide pillars; and the pressure plate structure is located on the side of the top seat facing the base assembly.

[0017] Optionally, the pressure plate structure includes a pressure plate and a second connecting seat, and the top seat is provided with a second connecting groove on one side facing the base assembly;

[0018] The pressure plate is located on the side of the top seat facing the base assembly, and the second connecting seat is fixedly connected to the side of the pressure plate facing the top seat. The second connecting seat is clamped in the second connecting groove to fix the pressure plate and the top seat.

[0019] Optionally, the stress relief device further includes a first stopper disposed on two opposite side walls of the base, and a second stopper disposed on two opposite side walls of the top seat;

[0020] The first end of the first stopper is rotatably disposed on the side wall surface corresponding to the base through a rotating shaft; and when the first stopper is rotated to the first position, the second end of the first stopper abuts against the first connecting seat;

[0021] The first end of the second stopper is rotatably disposed on the side wall surface corresponding to the top seat through a rotating shaft; and when the second stopper is rotated to the second position, the second end of the second stopper abuts against the second connecting seat.

[0022] Optionally, a first pressing block hole is provided on a side of the sample pad facing the top seat assembly, and the first pressing block hole is used to accommodate and fix the first pressing block;

[0023] A second pressing block hole is formed on one side of the pressure plate facing the base assembly, and the second pressing block hole is used to accommodate and fix the second pressing block.

[0024] Optionally, the stress relief device further comprises a plurality of elastic members;

[0025] Each of the elastic members is wound around the corresponding guide column, and the elastic member is located between the base assembly and the top assembly.

[0026] Optionally, the stress relief device further comprises a fixing seat, a positioning rod and a positioning block;

[0027] The fixing seat is fixed to the edge area of ​​one end of the base assembly along the axial direction thereof, the positioning rod is movably arranged through the fixing seat, and one end of the positioning rod is used to abut against the sample weldment;

[0028] The positioning block is rotatably arranged at an edge area of ​​the base assembly along one radial end thereof, one end of the positioning block is rotatably connected to the base assembly via a fastener, and the other end of the positioning block is used to abut against the sample weldment.

[0029] Optionally, the stress device further includes a handle provided on the base assembly, and a pressing handle provided on a side of the top seat assembly facing away from the base assembly.

[0030] The stress relief device for fracture toughness test of the embodiment of the present disclosure can effectively hammer the weld and adjacent areas of the sample weldment through the provided guide column, base assembly, top seat assembly, first pressure block and second pressure block to eliminate the residual stress of the sample weldment, and accurately control the indentation depth through the cooperation of the first pressure block and the second pressure block. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of a stress relief device for fracture toughness test according to an embodiment of the present disclosure;

[0032] Figure 2 A side view of a stress relief device for fracture toughness testing according to another embodiment of the present disclosure. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the technical solution of the present disclosure, the present disclosure is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0034] like Figure 1 and Figure 2As shown, a stress relief device 100 for fracture toughness test, the stress relief device 100 comprises a plurality of guide pillars 110, a base assembly 120, a top assembly 130, a first pressing block 140 and a second pressing block 150. The plurality of guide pillars 110 are arranged at intervals at the edge area of ​​the base assembly 120, and the first end of each guide pillar 110 is fixedly connected to the base assembly 120, and the first pressing block 140 is arranged at the central area of ​​the base assembly 120 on the side facing the top assembly 130;

[0035] The top seat assembly 130 is supported on the second ends of the plurality of guide pillars 110, and the top seat assembly 130 can slide along the plurality of guide pillars 110 from the second ends thereof to the first ends thereof, and the top seat assembly 130 is provided with a second pressing block 150 corresponding to the first pressing block 140 on the side facing the base assembly 120. The side of the base assembly 120 facing the top seat assembly 130 is used to carry the sample weldment 200, and during the sliding process of the top seat assembly 130 from the second ends of the plurality of guide pillars 110 to the first ends thereof, the first pressing block 140 and the second pressing block 150 cooperate to hammer the sample weldment 200, so as to eliminate the residual stress of the sample weldment 200 and generate an indentation on the sample weldment 200.

[0036] Specifically, Figure 1 and Figure 2 As shown, four guide posts 110 are fixedly arranged at the four edges of the base assembly 120, for example, the bottoms of the four guide posts 110 are fixed at the four corners of the base assembly 120, and a first pressing block 140 is arranged at the top center area of ​​the base assembly 120. Of course, the guide posts 110 can also be arranged in other numbers and spaced at the edge area of ​​the base assembly 120, and this embodiment does not impose specific restrictions on this. The top seat assembly 130 is slidably supported on the top of the four guide posts 110, and a second pressing block 150 is arranged at the bottom of the top seat assembly 130. When the stress relief device 100 for fracture toughness test is working, the sample weldment 200 is placed above the base assembly 120. At this time, the bottom of the sample weldment 200 is supported on the base assembly 120 and the first pressure block 140. The top seat assembly 130 is pressed downward, and the top seat assembly 130 slides toward the bottom along the top of the guide column 110 until the second pressure block 150 contacts the sample weldment 200 and produces a hammering effect on the sample weldment 200. The base assembly 120 and the first pressure block 140, the top seat assembly 130 and the second pressure block 150 can effectively eliminate the residual stress of the sample weldment 200 during the process of hammering the sample weldment 200, and the first pressure block 140 and the second pressure block 150 can make the sample weldment 200 produce a prefabricated indentation. It is not difficult to understand that the position of the sample weldment 200 can be adjusted according to actual needs, for example:

[0037] The stress relief device 100 further includes a fixing seat 190, a positioning rod 191 and a positioning block 192. The fixing seat 190 is fixedly arranged at an edge region of one end of the base assembly 120 along its axial direction, the positioning rod 191 is movably arranged through the fixing seat 190, and one end of the positioning rod 191 is used to abut the sample weldment 200. The positioning block 192 is rotatably arranged at an edge region of one end of the base assembly 120 along its radial direction, one end of the positioning block 192 is rotatably connected to the base assembly 120 through a fastener 193, and the other end of the positioning block 192 is used to abut the sample weldment 200.

[0038] Specific as Figure 1 and Figure 2 As shown, a fixing seat 190 can be set in the left edge area of ​​the base assembly 120, and a positioning rod 191 can be movably set in the fixing seat 190 through the cooperation of a lead screw nut and a screw. The positioning rod 191 is inserted into the fixing seat 190, and the left and right positions of the sample weldment 200 can be adjusted and positioned by adjusting the left and right positions of the positioning rod 191. A hand wheel 1911 can be fixedly connected to the left side of the positioning rod 191, and the specific position of the positioning rod can be adjusted by rotating the hand wheel 1911. A positioning block 192 is set in the rear edge area of ​​the base assembly 120, and one end of the positioning block 192 is movably connected to the base assembly 120 through a fastener 193, such as a positioning screw. By rotating the positioning block 192 connected to one end of the base assembly 120, the other end of the positioning block 192 is rotated to follow, so that the front and rear positions of the sample weldment 200 can be adjusted. It should be noted that the fixing seat and the positioning rod can also be set on the left side, and the positioning block can also be set in different positions such as the front. This embodiment does not specifically limit the specific positions of the fixing seat, the positioning rod, and the positioning block.

[0039] The stress relief device for fracture toughness test of the embodiment of the present disclosure can effectively hammer the weld and adjacent areas of the sample weldment through the provided guide column, base assembly, top seat assembly, first pressure block and second pressure block to eliminate the residual stress of the sample weldment, and accurately control the indentation depth through the cooperation of the first pressure block and the second pressure block.

[0040] For example, Figure 1 and Figure 2 As shown, the base assembly 120 includes a base 121 and a pad structure. The base 121 is provided with a plurality of fixing holes (not marked in the figure) along its edge area, and the fixing holes are used to fix the first ends of the corresponding guide pillars 110. The pad structure is located on the side of the base 121 facing the top assembly 130, and the pad structure facing the top assembly 130 is used to support the sample weldment 200.

[0041] Furthermore, the pad structure includes a sample pad 122 and a first connecting seat 123, and the base 121 is provided with a first connecting slot (not marked in the figure) on the side facing the top seat assembly 130. The sample pad 122 is located on the side facing the top seat assembly 130 of the base 121, and the side facing the top seat assembly 130 of the sample pad 122 is used to carry the sample weldment 200. The sample pad 122 is fixedly connected to the first connecting seat 123 on the side facing the base 121, and the first connecting seat 123 is clamped in the first connecting slot to fix the sample pad 122 and the base 121.

[0042] Specifically, Figure 1 and Figure 2 As shown, the four corners of the base 121 are respectively provided with fixing holes for fixing and connecting the bottom of the corresponding guide column 110, and the sample pad 122 is clamped in the first connection slot through the first connection seat 123. When the stress relief device 100 for fracture toughness test is used, the first connection seat 123 can be clamped into the first connection slot, so that the sample pad 122 is fixed to the top of the base 121, and then the sample weldment 200 is placed on the top of the sample pad 122 to prepare for hammering.

[0043] The stress relief device for fracture toughness test in the embodiment of the present disclosure provides support for the sample weldment through the provided base and pad structure, which is conducive to hammering the sample weldment to eliminate residual stress at a later time.

[0044] For example, Figure 1 and Figure 2 As shown, the sample pad 122 is provided with a first pressing block hole (not marked in the figure) on one side facing the top seat assembly 130, and the first pressing block hole is used to accommodate and fix the first pressing block 140. It should be noted that the first pressing block hole can be opened according to the required indentation diameter, and a first pressing block with matching size is fixedly accommodated in the first pressing block hole, so that an indentation of a corresponding diameter is generated at the bottom of the sample weldment 200. Of course, when the first pressing block 140 is fixedly accommodated in the first pressing block hole, the length of the first pressing block 140 exposed from the first pressing block hole can generate an indentation of a corresponding depth at the bottom of the sample weldment 200.

[0045] For example, Figure 1 and Figure 2 As shown, the top seat assembly 130 includes a top seat 131 and a pressure plate structure. The top seat 131 is provided with a plurality of guide holes (not marked in the figure) along its edge area, and the guide holes are used to slidably connect the second ends of the corresponding guide pillars 110. And the pressure plate structure is located on the side of the top seat 131 facing the base assembly 120.

[0046] Furthermore, the pressure plate structure includes a pressure plate 132 and a second connection seat 133, and a second connection slot (not marked in the figure) is provided on the side of the top seat 131 facing the base assembly 120. The pressure plate 132 is located on the side of the top seat 131 facing the base assembly 120, and the second connection seat 133 is fixedly connected to the side of the pressure plate 132 facing the top seat 131, and the second connection seat 133 is clamped in the second connection slot to fix the pressure plate 132 and the top seat 131.

[0047] Specifically, Figure 1 and Figure 2 As shown, guide holes are respectively provided at the four corners of the top seat 131 for sliding connection with the top of the corresponding guide column 110, and the pressure plate 132 is clamped in the second connection slot through the second connection seat 133. When the stress relief device 100 for fracture toughness test is used, the second connection seat 133 can be clamped in the second connection slot, so that the pressure plate 132 is fixed to the bottom of the top seat 131, and then the top seat 131 is pressed down so that the pressure plate 132 drives the second pressing block 150 to move downward together, and then the pressure plate 132 and the second pressing block 150, the sample pad 122 and the first pressing block 140 are hammered together to act on the sample weldment 200, thereby eliminating the residual stress of the sample weldment 200 and causing an indentation on the sample weldment 200.

[0048] For example, Figure 1 and Figure 2 As shown, the pressure plate 132 is provided with a second pressing block hole (not marked in the figure) on one side facing the base assembly 120, and the second pressing block hole is used to accommodate and fix the second pressing block 150. It should be noted that the second pressing block hole can be opened according to the required indentation diameter, and a second pressing block with matching size is fixedly accommodated in the second pressing block hole, so that an indentation of a corresponding diameter is generated on the top of the sample weldment 200. Of course, when the second pressing block 150 is fixedly accommodated in the second pressing block hole, the length of the second pressing block 150 exposed from the second pressing block hole can generate an indentation of a corresponding depth on the top of the sample weldment 200.

[0049] For example, Figure 1 and Figure 2As shown, the stress relief device 100 also includes a first stopper 160 disposed on opposite side walls of the base 121, and a second stopper 170 disposed on opposite side walls of the top seat 131. The first end of the first stopper 160 is rotatably disposed on the side wall surface corresponding to the base 121 through a rotating shaft (not marked in the figure). When the first stopper 160 rotates to the first position, the second end of the first stopper 160 abuts against the first connecting seat 123. The first end of the second stopper 170 is rotatably disposed on the side wall surface corresponding to the top seat 131 through a rotating shaft. When the second stopper 170 rotates to the second position, the second end of the second stopper 170 abuts against the second connecting seat 133.

[0050] Specifically, Figure 1 and Figure 2 As shown, first blocks 160 are rotatably provided on the side walls of the front and rear sides of the base 121 through a rotating shaft, and the first ends of the first blocks 160 are rotatably provided on the front and rear sides of the base 121 through a rotating shaft. When the first blocks 160 on the front and rear sides of the base 121 are rotated to the first position, the second ends of the first blocks 160 abut against the first connecting seat 123, thereby blocking and fixing the first connecting seat 123. Second blocks 170 are rotatably provided on the side walls of the front and rear sides of the top seat 131 through a rotating shaft, and the first ends of the second blocks 170 are rotatably provided on the front and rear sides of the top seat 131 through a rotating shaft. When the second blocks 170 on the front and rear sides of the top seat 131 are rotated to the second position, the second ends of the second blocks 170 abut against the second connecting seat 133, thereby blocking and fixing the second connecting seat 133.

[0051] The embodiments of the present disclosure can replace the pressure plate 132 and the sample pad 122 according to the wall thickness of different sample weldments. When replacement is required, the corresponding first stopper 160 and the second stopper 170 are rotated to disengage them from the first position and the second position respectively, and then the first connecting seat 123 can be disengaged from the first connecting slot to remove the sample pad 122 for replacement; the second connecting seat 133 can be disengaged from the second connecting slot to remove the pressure plate 132 for replacement. After replacing the new pressure plate 132 and sample pad 122, the first stopper 160 and the second stopper 170 are rotated to the first position and the second position respectively to block and position the first connecting seat 123 and the second connecting seat 133. By switching different sample pads and pressure plates, the weld of the sample weldment can be hammered quickly and accurately to eliminate residual stress.

[0052] For example, Figure 1 and Figure 2As shown, the stress relief device 100 further includes a plurality of elastic members 180 . Each of the elastic members 180 is wound around the corresponding guide pillar 110 , and the elastic member 180 is located between the base assembly 120 and the top assembly 130 .

[0053] Specifically, Figure 1 and Figure 2 As shown, an elastic member 180 is also provided on the guide column 110 between the base assembly 120 and the top seat assembly 130. The elastic member 180 can drive the second pressure block 150 to move from the top of the guide column 110 to the bottom and hammer the sample weldment 200 after the top seat assembly 130 drives the second pressure block 150 to automatically return to the top position of the guide column 110 by relying on the elastic force of the elastic member 180, so as to facilitate the next hammering of the sample weldment 200.

[0054] For example, Figure 1 and Figure 2 As shown, the stress device 100 further includes a handle 300 disposed on the base assembly 120 , and a pressing handle 400 disposed on a side of the top assembly 130 away from the base assembly 120 .

[0055] Specifically, Figure 1 and Figure 2 As shown, handles 300 can be respectively provided on the left and right side walls of the base 121 to facilitate carrying the stress device 100 through the handles 300. A pressing handle 400 can also be fixedly connected to the top of the top seat 131 through a fastener, such as a fastening screw, so that when pressing the top seat 131 downward, the pressing handle 400 can be held to press downward, which is more convenient and labor-saving.

[0056] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present disclosure, but the present disclosure is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and substance of the present disclosure, and these modifications and improvements are also considered to be within the scope of protection of the present disclosure.

Claims

1. A stress relief device for fracture toughness testing, characterized in that: The stress relief device includes a plurality of guide pillars, a base assembly, a top seat assembly, a first pressing block and a second pressing block; A plurality of guide posts are arranged at intervals at the edge area of ​​the base assembly, and a first end of each guide post is fixedly connected to the base assembly, and a first pressing block is arranged at the central area of ​​the base assembly on a side facing the top seat assembly; The top seat assembly is supported on the second ends of the plurality of guide pillars, and the top seat assembly can slide along the plurality of guide pillars from the second ends thereof to the first ends thereof, and a second pressing block corresponding to the first pressing block is provided on the side of the top seat assembly facing the base assembly; wherein, The side of the base assembly facing the top seat assembly is used to support the sample weldment. When the top seat assembly slides from the second end of the plurality of guide pillars to the first end thereof, the first pressing block and the second pressing block cooperate to hammer the sample weldment to eliminate the residual stress of the sample weldment and produce an indentation on the sample weldment.

2. The stress relief device for fracture toughness testing according to claim 1, characterized in that: The base assembly includes a base and a pad structure; The base is provided with a plurality of fixing holes along its edge area, and the fixing holes are used to fix and connect the first ends of the corresponding guide pillars; The pad structure is located on a side of the base facing the top seat assembly, and the side of the pad structure facing the top seat assembly is used to support the sample weldment.

3. The stress relief device for fracture toughness testing according to claim 2, characterized in that: The pad structure includes a sample pad and a first connecting seat, and a first connecting groove is formed on the side of the base facing the top seat assembly; The sample pad is located on the side of the base facing the top seat assembly, and the side of the sample pad facing the top seat assembly is used to support the sample weldment; The first connection seat is fixedly connected to the side of the sample pad facing the base, and the first connection seat is clamped in the first connection through groove to fix the sample pad and the base.

4. The stress relief device for fracture toughness testing according to claim 3, characterized in that: The top seat assembly includes a top seat and a pressure plate structure; The top seat is provided with a plurality of guide holes along its edge region, and the guide holes are used for sliding connection with the second ends of the corresponding guide pillars; and the pressure plate structure is located on the side of the top seat facing the base assembly.

5. The stress relief device for fracture toughness testing according to claim 4, characterized in that: The pressure plate structure includes a pressure plate and a second connecting seat, and the top seat is provided with a second connecting groove on one side facing the base assembly; The pressure plate is located on the side of the top seat facing the base assembly, and the second connecting seat is fixedly connected to the side of the pressure plate facing the top seat. The second connecting seat is clamped in the second connecting groove to fix the pressure plate and the top seat.

6. The stress relief device for fracture toughness testing according to claim 5, characterized in that: The stress relief device also includes a first stopper disposed on two opposite side walls of the base, and a second stopper disposed on two opposite side walls of the top seat; The first end of the first stopper is rotatably disposed on the side wall surface corresponding to the base through a rotating shaft; and when the first stopper is rotated to the first position, the second end of the first stopper abuts against the first connecting seat; The first end of the second stopper is rotatably disposed on the side wall surface corresponding to the top seat through a rotating shaft; and when the second stopper is rotated to the second position, the second end of the second stopper abuts against the second connecting seat.

7. The stress relief device for fracture toughness testing according to claim 5, characterized in that: A first pressing block hole is formed on one side of the sample pad facing the top seat assembly, and the first pressing block hole is used to accommodate and fix the first pressing block; A second pressing block hole is formed on one side of the pressure plate facing the base assembly, and the second pressing block hole is used to accommodate and fix the second pressing block.

8. The stress relief device for fracture toughness testing according to any one of claims 1 to 7, characterized in that: The stress relief device also includes a plurality of elastic members; Each of the elastic members is wound around the corresponding guide column, and the elastic member is located between the base assembly and the top assembly.

9. The stress relief device for fracture toughness testing according to any one of claims 1 to 7, characterized in that: The stress relief device also includes a fixing seat, a positioning rod and a positioning block; The fixing seat is fixed to the edge area of ​​one end of the base assembly along the axial direction thereof, the positioning rod is movably arranged through the fixing seat, and one end of the positioning rod is used to abut against the sample weldment; The positioning block is rotatably arranged at an edge area of ​​the base assembly along one radial end thereof, one end of the positioning block is rotatably connected to the base assembly via a fastener, and the other end of the positioning block is used to abut against the sample weldment.

10. The stress relief device for fracture toughness testing according to any one of claims 1 to 7, characterized in that: The stress device also includes a handle arranged on the base assembly, and a pressing handle arranged on a side of the top seat assembly away from the base assembly.

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