A DFRcutoff specimen prefabrication damage production device

Abstract

This invention relates to the field of material fatigue resistance assessment technology, and in particular to a device for creating pre-damage on a DFRcutoff specimen. The device includes a base and a specimen clamping assembly and a file clamping assembly mounted on the base. The specimen clamping assembly can hold the DFRcutoff specimen and is slidably mounted on the base. The file clamping assembly can clamp a file, which can process the DFRcutoff specimen. The file clamping assembly is connected to an adjustment mechanism, which is slidably mounted on the base and can drive the file clamping assembly to slide in a direction perpendicular to the plane of the base. In use, the specimen clamping assembly clamps the DFRcutoff specimen, and the file clamping assembly clamps the file. The file clamping assembly can reciprocate in the vertical direction to control the pre-damage size. After adjusting the file clamping assembly, the reciprocating sliding of the specimen clamping assembly achieves precise processing of the pre-damage on the specimen by the file.

Description

Technical Field

[0001] This invention relates to the field of material fatigue resistance assessment technology, and in particular to a DFRcutoff specimen pre-damage fabrication device. Background Technology

[0002] The detailed fatigue rated strength cutoff (DFRcutoff) of metallic materials is used for evaluating the fatigue resistance of materials, process selection, and structural detail design. The DFRcutoff value is determined experimentally, requiring the fabrication of a test specimen (hereinafter referred to as a DFRcutoff specimen). Chinese Patent Publication No. CN106446344A discloses a method for determining the DFR value of a notched structural test specimen, the technical solution of which involves calculating the DFR value for the notched structural test specimen.

[0003] In DFRcutoff specimen fabrication, creating the pre-damage is the most critical step in the process. The measured DFRcutoff values ​​are extremely sensitive to the size of the pre-damage, typically requiring an accuracy of 0.1 mm. Current technology involves manually creating the pre-damage on the specimen using a file, which has several drawbacks:

[0004] (1) The accuracy of the pre-fabricated damage dimensions cannot be guaranteed. This is the main drawback. The operation relies entirely on manual experience, and the accuracy is generally around 0.5 mm. This leads to the pre-fabricated damage shape and size of individual samples not meeting the test requirements. It also leads to the pre-fabricated damage dimensions of batch samples not meeting the consistency requirements.

[0005] (2) It is difficult to obtain the same pre-damage size for samples made of different materials. Different materials have different hardnesses. If the same pre-damage size is required, the filing force can only be controlled by experience, resulting in a high degree of dispersion in the actual size obtained.

[0006] Therefore, how to change the current situation in the preparation of DFRcutoff specimens where the pre-damage size is inconsistent and the dimensional accuracy cannot be guaranteed has become an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0007] The purpose of this invention is to provide a device for fabricating pre-damage in DFRcutoff specimens, so as to solve the problems existing in the prior art and improve the consistency and dimensional accuracy of pre-damage in DFRcutoff specimen fabrication.

[0008] To achieve the above objectives, the present invention provides the following solution: The present invention provides a DFRcutoff specimen pre-damage fabrication device, including a base and a specimen clamping assembly and a file clamping assembly disposed on the base. The specimen clamping assembly is capable of holding a DFRcutoff specimen and is slidably disposed on the base, with the relative sliding direction of the specimen clamping assembly and the base parallel to the plane of the base. The file clamping assembly is capable of clamping and mounting a file, which can process the DFRcutoff specimen. The file clamping assembly is connected to an adjustment mechanism, which is slidably disposed on the base and can drive the file clamping assembly to slide in a direction perpendicular to the plane of the base. The specimen clamping assembly slides relative to the base and causes the DFRcutoff specimen to rub against the file, thereby achieving pre-damage fabrication of the DFRcutoff specimen.

[0009] Preferably, the sample clamping assembly includes two parallel mounting seats with a gap between them. The mounting seats are slidably mounted on the base. Each mounting seat has a positioning groove, in which the DFRcutoff sample is placed. The mounting seat is also connected to a clamping member that can press the DFRcutoff sample into the positioning groove.

[0010] Preferably, both mounting seats are disposed on a mounting plate, and a slide rail is provided between the mounting plate and the base, the slide rail being perpendicular to the line connecting the two mounting seats; the clamping member is an elbow clamp.

[0011] Preferably, the mounting plate is connected to an adjustment handle, which is rotatably mounted on the base and is connected to the mounting base via a lead screw.

[0012] Preferably, the filing clamping assembly includes a support block and a clamping block, the number of clamping blocks is two, the two clamping blocks are detachably connected, the two clamping blocks can clamp the file, the two clamping blocks are located between the two mounting seats, one of the clamping blocks is slidably disposed on the support block, and the support block is fixed on the base.

[0013] Preferably, the clamping block is provided with a limiting groove, the shape of the limiting groove matches the shape of the file, the limiting grooves of the two clamping blocks are arranged opposite to each other, the two clamping blocks cooperate to clamp the file, the two clamping blocks are connected by bolts; the clamping block and the support block are detachably connected.

[0014] Preferably, the adjustment mechanism includes a micrometer assembly, and a clamping block near the support block is connected to the micrometer assembly, the micrometer assembly being able to drive the clamping block to reciprocate in the vertical direction.

[0015] Preferably, both the sample clamping assembly and the filing clamping assembly are provided with size scales.

[0016] The present invention achieves the following technical advantages over the prior art: The DFRcutoff specimen pre-damage fabrication device of the present invention includes a base and a specimen clamping assembly and a file clamping assembly disposed on the base. The specimen clamping assembly can hold the DFRcutoff specimen and is slidably disposed on the base, and the relative sliding direction of the specimen clamping assembly and the base is parallel to the plane of the base. The file clamping assembly can hold and install a file, which can process the DFRcutoff specimen. The file clamping assembly is connected to an adjustment mechanism, which is slidably disposed on the base and can drive the file clamping assembly to slide in a direction perpendicular to the plane of the base. The specimen clamping assembly slides relative to the base and causes the DFRcutoff specimen to rub against the file, thereby realizing the pre-damage fabrication of the DFRcutoff specimen. When using the DFRcutoff specimen pre-damage fabrication device of the present invention, the specimen clamping assembly can clamp the DFRcutoff specimen, and the file clamping assembly can clamp the file. The file clamping assembly can reciprocate in the vertical direction to control the pre-damage size. After adjusting the file clamping assembly, the specimen clamping assembly is slid back and forth to realize the processing of the DFRcutoff specimen by the file. The device of the present invention uses the relative movement between the specimen clamping assembly and the base to realize the fabrication of DFRcutoff specimen pre-damage. The damage size fabrication of batch specimens has high consistency. Using the device of the present invention, the efficiency and standardization of DFRcutoff specimen fabrication are greatly improved, which brings great convenience to the subsequent measurement and processing of test values. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the DFRcutoff specimen pre-damage fabrication device of the present invention;

[0019] Figure 2 This is a schematic diagram of the clamping plate of the DFRcutoff specimen pre-damage fabrication device of the present invention;

[0020] Figure 3 This is a schematic diagram of the filing and clamping assembly of the DFRcutoff specimen pre-damage fabrication device of the present invention;

[0021] Figure 4 This is a schematic diagram showing the adjustment position of the filing clamping assembly of the DFRcutoff specimen pre-damage fabrication device of the present invention;

[0022] Figure 5 This is a schematic diagram of the sample clamping assembly of the DFRcutoff sample pre-damage fabrication device of the present invention.

[0023] Figure 6 This is a schematic diagram of the specimen clamping assembly of the DFRcutoff specimen pre-damage fabrication device of the present invention clamping the specimen.

[0024] Figure 7 This is a top view of the DFRcutoff specimen pre-damage fabrication device of the present invention.

[0025] Figure 8 This is a top view of the DFRcutoff specimen pre-damage fabrication device of the present invention during operation.

[0026] Among them, 1 is the base, 2 is the sample clamping assembly, 3 is the filing clamping assembly, 4 is the mounting base, 5 is the positioning groove, 6 is the clamping part, 7 is the slide rail, 8 is the adjusting handle, 9 is the support block, 10 is the clamping block, 11 is the limiting groove, 12 is the micrometer assembly, 13 is the DFRcutoff sample, 14 is the file, and 15 is the mounting plate. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0028] The purpose of this invention is to provide a device for fabricating pre-damage in DFRcutoff specimens, so as to solve the problems existing in the prior art and improve the consistency and dimensional accuracy of pre-damage in DFRcutoff specimen fabrication.

[0029] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] Please refer to Figure 1-8 ,in, Figure 1 This is a schematic diagram of the DFRcutoff specimen pre-damage fabrication device of the present invention. Figure 2 This is a schematic diagram of the clamping plate of the DFRcutoff specimen pre-damage fabrication device of the present invention. Figure 3 This is a schematic diagram of the filing and clamping assembly of the DFRcutoff specimen pre-damage fabrication device of the present invention. Figure 4 This is a schematic diagram illustrating the adjustment of the filing and clamping assembly of the DFRcutoff specimen pre-damage fabrication apparatus of the present invention. Figure 5 This is a schematic diagram of the specimen clamping assembly of the DFRcutoff specimen pre-damage fabrication device of the present invention. Figure 6 This is a schematic diagram of the specimen clamping assembly of the DFRcutoff specimen pre-damage fabrication device of the present invention, showing the specimen clamping structure. Figure 7 This is a top view schematic diagram of the DFRcutoff specimen pre-damage fabrication device of the present invention. Figure 8 This is a top view of the DFRcutoff specimen pre-damage fabrication device of the present invention during operation.

[0031] This invention provides a DFRcutoff specimen pre-damage fabrication device, including a base 1 and a specimen clamping assembly 2 and a file clamping assembly 3 disposed on the base 1. The specimen clamping assembly 2 can hold a DFRcutoff specimen 13 and is slidably disposed on the base 1. The relative sliding direction of the specimen clamping assembly 2 and the base 1 is parallel to the plane of the base 1. The file clamping assembly 3 can clamp a file 14, which can process the DFRcutoff specimen 13. The file clamping assembly 3 is connected to an adjustment mechanism, which is slidably disposed on the base 1 and can drive the file clamping assembly 3 to slide in a direction perpendicular to the plane of the base 1.

[0032] When using the DFRcutoff specimen pre-damage fabrication device of the present invention, the specimen clamping assembly 2 can clamp the DFRcutoff specimen 13, and the file clamping assembly 3 clamps the file 14. The file clamping assembly 3 can reciprocate in the vertical direction to control the pre-damage size. After adjusting the file clamping assembly 3, the specimen clamping assembly 2 is slid back and forth to realize the processing of the DFRcutoff specimen 13 by the file 14. The device of the present invention uses the relative movement between the specimen clamping assembly 2 and the base 1 to realize the fabrication of pre-damage on the DFRcutoff specimen 13. The damage size fabrication of batch specimens has high consistency. Using the device of the present invention, the fabrication efficiency and standardization of DFRcutoff specimen 13 are greatly improved, which brings great convenience to the subsequent measurement and processing of test values.

[0033] The sample clamping assembly 2 includes two parallel mounting seats 4 with a gap between them. The mounting seats 4 are slidably mounted on the base 1. Each mounting seat 4 has a positioning groove 5, within which the DFRcutoff sample 13 is placed. Each mounting seat 4 is also connected to a clamping element 6, which presses the DFRcutoff sample 13 firmly into the positioning groove 5. By placing both ends of the DFRcutoff sample 13 into the positioning groove 5, positioning the pre-damaged section between the two mounting seats 4, and pressing the DFRcutoff sample 13 firmly with the two clamping elements 6, the sample is prevented from wobbling and affecting processing accuracy. It should be noted that the shape, size, and angle of the positioning groove 5 can be arranged according to the size of the DFRcutoff sample 13 and the location of the pre-damaged section.

[0034] To ensure the uniformity of sample movement, both mounting bases 4 are mounted on mounting plate 15, which is slidably connected to base 1. To improve the relative smoothness of sliding between mounting plate 15 and base 1, a slide rail 7 is provided between mounting plate 15 and base 1. The slide rail 7 also restricts the movement trajectory of mounting plate 15, preventing misalignment and thus improving the movement accuracy of mounting base 4. In this specific embodiment, the slide rail 7 is perpendicular to the line connecting the two mounting bases 4. In practical applications, the setting direction of the slide rail 7 can be specifically set according to the pre-damage processing position and processing conditions of DFRcutoff sample 13. In addition, the clamping member 6 is an elbow clamp, which is convenient and quick to operate, improving work efficiency.

[0035] In addition, the mounting plate 15 is connected to an adjustment handle 8, which is rotatably mounted on the base 1. The adjustment handle 8 is connected to the mounting seat 4 via a lead screw. By rotating the adjustment handle 8, the mounting seat 4 can be driven to slide on the base 1, which is convenient to operate and improves the motion accuracy of the mounting seat 4, avoids misoperation, and thus improves the pre-damage processing accuracy of the DFRcutoff sample 13.

[0036] Specifically, the filing clamping assembly 3 includes a support block 9 and a clamping block 10. There are two clamping blocks 10, which are detachably connected. The two clamping blocks 10 can clamp the file 14. The two clamping blocks 10 are located between two 4s. The file 14 is located between two platform connecting plates 4 to process the DFRcutoff sample 13. One of the clamping blocks 10 is slidably set on the support block 9. The support block 9 is fixed on the base 1. Adjusting the relative position of the clamping block 10 and the support block 9 can drive the file 14 to rise or fall, thereby controlling the pre-damage size.

[0037] To further improve the stability of the file 14, a limiting groove 11 is provided on the clamping block 10. The shape of the limiting groove 11 matches the shape of the file 14. The limiting grooves 11 of the two clamping blocks 10 are arranged opposite each other. The two clamping blocks 10 cooperate to clamp the file 14, ensuring the processing accuracy of the file 14. The two clamping blocks 10 are connected by bolts, which makes disassembly and assembly convenient. The clamping block 10 is detachably connected to the support block 9. In order to adapt to different files 14, multiple sets of clamping blocks 10 can be set. Multiple sets of clamping blocks 10 have limiting grooves 11 with different shapes. By adjusting the clamping blocks 10, files 14 of different specifications can be clamped, meeting various processing needs and improving the flexibility and adaptability of the tooling.

[0038] In this specific embodiment, to improve machining accuracy, the adjustment mechanism includes a micrometer assembly 12. A clamping block 10 near the support block 9 is connected to the micrometer assembly 12. The micrometer assembly 12 can drive the clamping block 10 to reciprocate. The micrometer assembly 12 can achieve an adjustment of the file 14 with a vertical accuracy of 0.01 mm, thereby improving machining accuracy. In other specific embodiments of the present invention, the clamping block 10 can also be connected to the support block 9 through a gear rack or worm gear mechanism, which, while driving the file 14 to rise and fall, improves machining accuracy and the stability of the file 14.

[0039] Furthermore, the sample clamping assembly 2 and the file clamping assembly 3 are detachably connected to the base 1, which facilitates the disassembly and adjustment of the relative positions of the DFRcutoff sample 13 and the file 14, and also facilitates cleaning and maintenance.

[0040] When using the tooling for pre-damage fabrication of the DFRcutoff specimen according to the present invention, the specimen clamping assembly 2 can clamp the DFRcutoff specimen 13, and the file clamping assembly 3 can clamp the file 14. The file clamping assembly 3 can reciprocate in the vertical direction to control the size of the pre-damage. After adjusting the file clamping assembly 3, the specimen clamping assembly 2 is slid back and forth to realize the processing of the DFRcutoff specimen 13 by the file 14. The tooling of this invention utilizes the relative movement between the sample clamping assembly 2 and the base 1 to create pre-damage on the DFRcutoff sample 13. This results in high consistency in the damage dimensions of batch samples. For samples made of different materials, the consistency of the pre-damage dimensions can be achieved by controlling the feed value, reducing the dispersion to a negligible level. Simultaneously, the filing clamping assembly 3 is equipped with a micrometer assembly 12, improving the dimensional accuracy of the pre-damage creation to 0.01 mm. Furthermore, the tooling of this invention can adapt to various types and specifications of files 14, meeting the requirements for pre-damage on different samples. Using the tooling of this invention significantly improves the efficiency and standardization of DFRcutoff sample 13 production, greatly facilitating the subsequent measurement and processing of experimental values.

[0041] The above description is merely a specific embodiment of the present invention, providing a detailed description of the invention. Parts not covered herein are conventional techniques. However, the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. The scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A DFRcutoff specimen pre-damage fabrication device, characterized in that: The device includes a base and a sample clamping assembly and a file clamping assembly mounted on the base. The sample clamping assembly can hold a DFRcutoff sample and is slidably mounted on the base, with the relative sliding direction of the sample clamping assembly and the base parallel to the plane of the base. The file clamping assembly can hold and mount a file, which can process the DFRcutoff sample. The file clamping assembly is connected to an adjustment mechanism, which is slidably mounted on the base and can drive the file clamping assembly to slide in a direction perpendicular to the plane of the base. The sample clamping assembly slides relative to the base and causes the DFRcutoff sample to rub against the file, thereby creating pre-damage on the DFRcutoff sample. The sample clamping assembly includes two parallel mounting seats with a gap between them. The mounting seats are slidably mounted on the base. Each mounting seat has a positioning groove, in which the DFRcutoff sample is placed. The mounting seat is also connected to a clamping member, which can press the DFRcutoff sample into the positioning groove. The filing clamping assembly includes a support block and a clamping block. There are two clamping blocks, which are detachably connected. The two clamping blocks can clamp the file. The two clamping blocks are located between two mounting seats. One of the clamping blocks is slidably disposed on the support block, and the support block is fixed to the base. Both mounting bases are mounted on a mounting plate, and a slide rail is provided between the mounting plate and the base, the slide rail being perpendicular to the line connecting the two mounting bases; the clamping element is an elbow clamp; The mounting plate is connected to an adjustment handle, which is rotatably mounted on the base. The adjustment handle is connected to the mounting base via a lead screw. The clamping block is provided with a limiting groove, the shape of which matches the shape of the file. The limiting grooves of the two clamping blocks are arranged opposite to each other, and the two clamping blocks can clamp the file when they cooperate. The two clamping blocks are connected by bolts. The clamping block and the support block are detachably connected. The adjustment mechanism includes a micrometer assembly, and a clamping block near the support block is connected to the micrometer assembly. The micrometer assembly can drive the clamping block to reciprocate in the vertical direction.

2. The DFRcutoff specimen pre-damage fabrication device according to claim 1, characterized in that: Both the sample clamping assembly and the filing clamping assembly are equipped with dimensional scales.

Images