A device and method for rapid processing of low-magnification and hardness samples of round bar products
By setting up an adjustable fixture and a new probe made of SKD61 tool steel probe, the problems of low magnification of round bar products and insufficient processing accuracy of hardness specimens were solved, achieving fast and efficient processing and reducing costs.
Patent Information
- Application Number
- CN202410814348.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-24
- Publication Date
- 2025-10-17
- Estimated Expiration
- 2044-06-24
AI Technical Summary
The existing technology is difficult to meet the low-magnification and hardness specimen processing requirements of round bar products with specifications of φ40~140mm. The processing accuracy is insufficient, the rework rate is high, the inspection cycle is long, and the cost consumption is high.
The first fixture and the second fixture are used in conjunction with a new probe. The fixture has an adjustable range of φ70~130mm and φ40~70mm. The new probe is made of SKD61 tool steel. The detachable structure is set to improve replacement efficiency and accurately control the feed amount.
It broadens the processing range, improves processing efficiency and quality, reduces consumables costs, and meets the large-scale production needs of enterprises.
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Figure CN118595505B_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of round bar product sample processing, in particular to a rapid processing device and method for round bar product macro and hardness samples. BACKGROUND
[0002] At present, the processing method for round bar product macro and hardness samples is affected by many restrictive factors, and it is difficult to meet the needs of enterprise mass production. The effective stroke of the existing high-speed milling clamp is φ140-150mm, which cannot meet the requirements of φ40-140mm round bar product macro and hardness samples. The existing probe cannot eliminate the influence of inaccurate feed amount, resulting in insufficient processing accuracy, high rework rate, long inspection cycle and high cost consumption. SUMMARY
[0003] The purpose of the present application is to provide a rapid processing device and method for round bar product macro and hardness samples. The first clamp 1 and the second clamp 2 are provided to realize full coverage of φ40-150mm round bar product macro and hardness samples. The new probe 3 is detachably arranged to facilitate the replacement of the needle 31, saving 20min / time for each replacement. The new probe 3 is made of SKD61 tool steel material, which is not easy to bend and cause the milling cutter feed amount to be difficult to control, thereby solving the problems raised in the above background technology.
[0004] To achieve the above purpose, the present application provides the following technical scheme:
[0005] A rapid processing device for round bar product macro and hardness samples, comprising a first clamp, a second clamp and a new probe, the first clamp is provided with a first "v"-shaped clamping plate, the upper end of the first "v"-shaped clamping plate is provided with a first telescopic pressing plate, the lower end of the first "v"-shaped clamping plate is mirror-symmetrically provided with a second "v"-shaped clamping plate, the second "v"-shaped clamping plate is fixed on the operation table through bolts, the lower end of the first "v"-shaped clamping plate is provided with a first adjusting clamping plate, the lower end of the first adjusting clamping plate is provided with a second adjusting clamping plate, the upper end of the second "v"-shaped clamping plate is provided with a third adjusting clamping plate, the first clamp is used for clamping samples with a size range of φ70-130mm, the second clamp is provided with a lower clamping plate, the upper end of the lower clamping plate is provided with a left clamping plate and a right clamping plate on both sides, the upper end of the left clamping plate is provided with a second telescopic pressing plate, the upper end of the right clamping plate is provided with a "v"-shaped extrusion rod, the upper end of the "v"-shaped extrusion rod is provided with a third telescopic pressing plate, the lower clamping plate and the right clamping plate are fixed on the operation table through bolts, the second clamp is used for clamping five samples with a size range of φ40-70mm at the same time, the new probe comprises a connecting piece and a measuring needle, one end of the measuring needle is sleeved in the connecting piece and locked through a jack screw, and the measuring needle is made of SKD61 tool steel probe material.
[0006] Preferably, the first "v" shaped clamping plate is provided with a "V" shaped opening, the included angle of the "V" shaped opening is the same as the included angle of the outer edge of the first adjusting clamping plate, and the first adjusting clamping plate is clamped in the "V" shaped opening.
[0007] Preferably, the first adjusting clamping plate, the second adjusting clamping plate and the third adjusting clamping plate are all "v" shaped, the included angle of the inner edge of the first adjusting clamping plate is the same as the included angle of the outer edge of the second adjusting clamping plate, the included angle of the inner edge of the second adjusting clamping plate is greater than the included angle of the inner edge of the third adjusting clamping plate, and the included angle of the outer edge of the third adjusting clamping plate is the same as the included angle of the "V" shaped opening.
[0008] Preferably, the first telescopic pressing plate is provided with a first locking bolt, the length of the first locking bolt is greater than 60mm, one end of the first locking bolt is connected with the first pressing fixing part, the other end of the first locking bolt is connected with a first pressing strip, and the first pressing strip is locked through the locking nut on the first locking bolt.
[0009] Preferably, the second telescopic pressing plate is provided with a second locking bolt, one end of the second locking bolt is connected with the second pressing fixing part, the other end of the second locking bolt is connected with a second pressing strip, the length of the second pressing strip is greater than the width of the left clamping plate by 60mm, and the second pressing strip is locked through the locking nut on the second locking bolt.
[0010] Preferably, the third telescopic pressing plate is provided with a third locking bolt, one end of the third locking bolt is connected with the second pressing fixing part, the other end of the third locking bolt is connected with a third pressing strip, the length of the third locking bolt is greater than 90mm, and the third pressing strip is locked through the locking nut on the third locking bolt.
[0011] Preferably, the "v" shaped extrusion rod is provided with a cross bar, one end of the cross bar is arranged on the upper end of the right clamping plate, the other end of the cross bar is connected with a "V" shaped pressing plate at the bottom, the "V" shaped pressing plate is arranged between the left clamping plate and the right clamping plate, the length of the left clamping plate is greater than the length of the right clamping plate, and the length of the lower clamping plate is greater than the width of the left clamping plate by 140mm.
[0012] Another technical problem to be solved by the present application is to provide a rapid processing method for round bar product macro and hardness samples, comprising the following steps:
[0013] S1, first, sample selection and preparation, the selected sample with a specification of φ40-150mm is transversely sawed into a full cross-section round cake shaped sample with a height of 35-50mm and a size head tolerance of ±1mm;
[0014] S2, using a 960a high-speed milling device to process the surface of the sample, and the processing steps are as follows:
[0015] S21, according to different sample specifications, grading processing is loaded, for the sample with the specification range of φ140-150mm, through the existing range of φ140-150mm clamp is loaded, single loading one piece, for the sample with the specification range of φ70-130mm, through the first clamp is loaded, single loading one piece, for the sample with the specification range of φ40-70mm, through the second clamp is loaded, while loading five pieces of sample;
[0016] S22, start the cycle start button, measure the height zero, program input sample diameter, automatically capture three points of the measured surface mutually 120°, take the length of 80% sample radius from the center as the reference point, obtain the information of sample height, establish the reference zero reference surface, if the three points are not in a horizontal plane, take the lowest point vertical coordinate as the reference zero;
[0017] S23, set the milling down tool amount, measure the reference zero reference surface through the new probe, process 1.5mm on the basis of zero, complete the rapid processing test of round bar product macro and hardness sample.
[0018] Compared with the prior art, the beneficial effects of the present application are:
[0019] The present application provides a kind of round bar product macro and hardness sample rapid processing device and method, by the application of the first clamp, second clamp and new probe set, to broaden the original φ140-150mm range, improve single loading amount, shorten the measuring needle replacement time, improve the sample processing efficiency;By using the SKD tool steel probe material that is not easy to bend and deform, accurately control the feed amount, improve the processing quality, avoid the quality problem caused by the processing precision does not conform;By only replacing the measuring needle, not only improve the processing efficiency, also reduce the cost of consumables, meet the enterprise mass production demand. BRIEF DESCRIPTION OF DRAWINGS
[0020] Figure 1 It is the first clamp structure diagram of the present application;
[0021] Figure 2 It is the second clamp structure diagram of the present application;
[0022] Figure 3 It is the "v" shaped extrusion rod structure diagram of the present application;
[0023] Figure 4 It is the new probe structure diagram of the present application.
[0024] In the figure: 1, first clamp; 11, first "v" shaped clamping plate; 111, "V" shaped opening; 12, second "v" shaped clamping plate; 13, first adjusting clamping plate; 14, second adjusting clamping plate; 15, third adjusting clamping plate; 2, second clamp; 21, lower clamping plate; 22, left clamping plate; 23, right clamping plate; 24, "v" shaped extruding rod; 241, horizontal rod; 242, "V" shaped pressing plate; 3, new probe; 31, connecting piece; 32, measuring needle; 33, top wire; 4, first telescopic pressing plate; 41, first locking bolt; 42, first pressing fixing piece; 43, first pressing strip; 5, second telescopic pressing plate; 51, second locking bolt; 52, second pressing fixing piece; 53, second pressing strip; 6, third telescopic pressing plate; 61, third locking bolt; 62, third pressing strip. DETAILED DESCRIPTION
[0025] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.
[0026] To solve the existing problems, please refer to Figures 1-4 The technical solutions are provided in the embodiments as follows:
[0027] The utility model provides a kind of quick processing device of round bar product low multiple and hardness test sample, including first clamp 1, second clamp 2 and new type probe 3, first clamp 1 is provided with first "v" shape clamping plate 11, first "v" shape clamping plate 11 upper end is provided with first telescopic pressing plate 4, first "v" shape clamping plate 11 below is provided with mirror image symmetry with second "v" shape clamping plate 12, second "v" shape clamping plate 12 is fixed on operating table by bolt, first "v" shape clamping plate 11 lower end angle is provided with first adjusting clamping plate 13, first adjusting clamping plate 13 lower end angle is provided with second adjusting clamping plate 14, second "v" shape clamping plate 12 upper end angle is provided with third adjusting clamping plate 15, and first adjusting clamping plate 13, second adjusting clamping plate 14 and third adjusting clamping plate 15 are adjusted to clamping size by increasing or decreasing, and the clamping range of first clamp 1 can be φ70~130mm, second clamp 2 is provided with lower clamping plate 21, and both sides of lower clamping plate 21 upper end are provided with left clamping plate 22 and right clamping plate 23 respectively, left clamping plate 22 upper end is provided with second telescopic pressing plate 5, and right clamping plate 23 upper end is provided with "v" shape extrusion rod 24, and "v" shape extrusion rod 24 upper end is provided with third telescopic pressing plate 6, and second telescopic pressing plate 5 and third telescopic pressing plate 6 are realized to test sample and press tightly, and lower clamping plate 21 and right clamping plate 23 are fixed on operating table by bolt, and second clamp 2 can simultaneously hold five test samples with the size range of φ40~70mm, and the clamping size is adjusted by adjusting the position of left clamping plate 22 and "v" shape extrusion rod 24, new type probe 3 includes connecting piece 31 and measuring needle 32, and one end of measuring needle 32 is sleeved in connecting piece 31 and is locked by top wire 33, realizes only the probe replacement mode of replacing measuring needle 32, is more efficient, and measuring needle 32 adopts SKD61 tool steel probe material, and SKD61 tool steel probe material has φ1mm conductive, hard and invariable deformation, fragile breakage characteristics, avoids the problem that probe is easily bent and leads to large feed amount, and processing precision is improved.
[0028] Please refer to Figure 1 , the shape size of first "v" shape clamping plate 11 is same with second "v" shape clamping plate 12, and "V" shape opening 111 is arranged on first "v" shape clamping plate 11, and the included angle of "V" shape opening 111 is same with the included angle of the outer edge of first adjusting clamping plate 13, and first adjusting clamping plate 13 is clamped in "V" shape opening 111, and first adjusting clamping plate 13 is "v" shape.
[0029] Second adjusting clamping plate 14 and third adjusting clamping plate 15 are "v" shape, and it is convenient to clamp test sample, and the included angle of the inner edge of first adjusting clamping plate 13 is same with the included angle of the outer edge of second adjusting clamping plate 14, and the included angle of the inner edge of second adjusting clamping plate 14 is greater than the included angle of the inner edge of third adjusting clamping plate 15, and the included angle of the outer edge of third adjusting clamping plate 15 is same with the included angle of "V" shape opening 111, and the clamping size is adjusted by increasing or decreasing first adjusting clamping plate 13, second adjusting clamping plate 14 and third adjusting clamping plate 15.
[0030] A first locking bolt 41 is provided on the first telescopic pressure plate 4. The length of the first locking bolt 41 is greater than 60 mm, which is sufficient to stretch and tighten the sample in the range of φ70 to 130 mm. One end of the first locking bolt 41 is connected to the first pressure fixing piece 42, and the first pressure fixing piece 42 is fixed to the operating table by bolts. The other end of the first locking bolt 41 is connected to the first pressure strip 43, and the first pressure strip 43 is locked by the locking nut on the first locking bolt 41.
[0031] See also Figure 2 A second locking bolt 51 is provided on the second telescopic pressure plate 5, one end of the second locking bolt 51 is connected to the second pressure fixing piece 52, and the second pressure fixing piece 52 is fixed to the operating table by bolts. The other end of the second locking bolt 51 is connected to the second pressure strip 53, and the length of the second pressure strip 53 is 60 mm longer than the width of the left clamping plate 22, which is sufficient to move the left clamping plate 22 left and right to clamp the sample with a clamping range of φ40 to 70 mm. The second pressure strip 53 is locked by the locking nut on the second locking bolt 51.
[0032] A third locking bolt 61 is provided on the third telescopic pressure plate 6, one end of the third locking bolt 61 is connected to the second pressure fixing piece 52, and the other end of the third locking bolt 61 is connected to the third pressure strip 62, and a "V"-shaped extrusion rod 24 is provided at the lower end of the third pressure strip 62. The length of the third locking bolt 61 is greater than 90 mm, which is sufficient for the "V"-shaped extrusion rod 24 to move up and down to clamp the sample with a clamping range of φ40~70 mm. The third pressure strip 62 is locked by the locking nut on the third locking bolt 61.
[0033] See also Figure 2 and Figure 3 A cross bar 241 is provided on the "V"-shaped extrusion rod 24, one end of the cross bar 241 is provided on the upper end of the right clamping plate 23, and the bottom of the other end of the cross bar 241 is connected to a "V"-shaped pressing plate 242. The "V"-shaped pressing plate 242 is provided between the left clamping plate 22 and the right clamping plate 23. The V"-shaped pressing plate 242 is convenient for clamping the sample. The length of the left clamping plate 22 is longer than the length of the right clamping plate 23, and the length of the lower clamping plate 21 is 140mm longer than the width of the left clamping plate 22, which is sufficient to move the left clamping plate 22 left and right to clamp the sample in the range of φ40 to 70mm.
[0034] In order to better demonstrate the processing flow of the present invention, this embodiment now proposes a rapid processing method for low-magnification and hardness test specimens of round bar products, including the following steps:
[0035] Step 1: First, select the sample with a specification of φ40~150mm, and then saw the selected sample horizontally into a full-section round pancake sample with a height of 35~50mm and a tolerance of ±1mm for the size of the end;
[0036] Step two, use 960a high-speed milling equipment for surface processing of the sample, the processing steps are as follows:
[0037] First, according to different sample specifications, grading processing, for the sample with a size range of φ140-150mm, the existing range of φ140-150mm is used for clamping, and one sample is clamped at a time;
[0038] For the sample with a size range of φ70-130mm, the first clamp 1 is used for clamping, and one sample is clamped at a time (for example, for a sample with a size of φ70mm, first, the third adjusting clamp plate 15 is clamped at the "V" shaped opening 111 of the second "v" shaped clamp plate 12, then the sample is placed in the third adjusting clamp plate 15, the second adjusting clamp plate 14 is clamped on the sample, the first adjusting clamp plate 13 is clamped on the second adjusting clamp plate 14, and the first "v" shaped clamp plate 11 is clamped on the first adjusting clamp plate 13, as shown in Figure 1 , loosen the locking nut on the first locking bolt 41, pull down the first pressing strip 43 to the first "v" shaped clamp plate 11, and tighten the locking nut on the first locking bolt 41 to lock the first pressing strip 43);
[0039] For the sample with a size range of φ40-70mm, the second clamp 2 is used for clamping, and five samples are clamped at a time (for example, for five samples with a size of φ40mm, loosen the locking nuts on the second locking bolt 51 and the third locking bolt 61, place the five samples as shown in Figure 2 the left clamp plate 22, tighten the locking nut on the second locking bolt 51 to lock the second pressing strip 53, and pull down the "v" shaped pressing rod 24 until the "V" shaped pressing plate 242 clamps the sample, and tighten the locking nut on the third locking bolt 61 to lock the third pressing strip 62 and the "v" shaped pressing rod 24);
[0040] Second, turn on the cycle start button, measure the height zero, program the sample diameter, automatically capture three points on the measured surface, take the length of 80% of the sample radius from the center as the reference point, obtain the sample height information, establish the reference zero reference surface, if the three points are not on the same horizontal plane, take the lowest point vertical coordinate as the reference zero;
[0041] Third, set the milling depth, measure the reference zero reference surface with the new probe 3, process 1.5mm on the basis of zero, complete the rapid processing test of the low-magnification and hardness sample of the round bar product;
[0042] When the measuring needle 32 needs to be replaced, loosen the top wire 33, remove the measuring needle 32 and replace it with a new measuring needle 32, and lock the top wire 33.
[0043] To sum up: the application provides a kind of round bar product low and hardness sample fast processing device and method, by the first clamp 1, second clamp 2 and novel probe 3 of application setting, to broaden original φ140~150mm range, improve single sample loading quantity, shorten measuring needle 32 replacement time, improve sample processing efficiency;By using the probe material of SKD61 tool steel that is not easy to bend and deform, accurately control the amount of feed, improve the processing quality, avoid the quality problem caused by the processing precision does not meet;By only replacing measuring needle 32, not only improve the processing efficiency, also reduce the cost of consumables, meet the enterprise mass production demand.
[0044] It should be noted that in this paper, such as the first and second relationship terms are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the term "include", "contain" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or includes elements inherent in such process, method, article or equipment.
[0045] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.
Claims
1. A rapid processing device for low-magnification and hardness specimens of round bar products, characterized by: The invention comprises a first clamp (1), a second clamp (2) and a novel probe (3), wherein the first clamp (1) is provided with a first "V"-shaped clamp (11), the upper end of the first "V"-shaped clamp (11) is provided with a first telescopic pressing plate (4), a second "V"-shaped clamp (12) is provided below the first "V"-shaped clamp (11) in a mirror-symmetrical manner, the second "V"-shaped clamp (12) is fixed to the operating table by bolts, a first adjusting clamp (13) is provided at an angle at the lower end of the first "V"-shaped clamp (11), a second adjusting clamp (14) is provided at an angle at the lower end of the first adjusting clamp (13), and a third adjusting clamp (15) is provided at an angle at the upper end of the second "V"-shaped clamp (12), the first clamp (1) is used for clamping a sample with a specification range of φ70~130mm, the second clamp (2) is used for clamping a sample with a specification range of φ70~130mm, and the second clamp (3) is used for clamping a sample with a specification range of φ70~130mm. The second clamp (2) is provided with a lower clamp (21), and a left clamp (22) and a right clamp (23) are provided on both sides of the upper end of the lower clamp (21), a second telescopic pressure plate (5) is provided on the upper end of the left clamp (22), a "V"-shaped extrusion rod (24) is provided on the upper end of the right clamp (23), and a third telescopic pressure plate (6) is provided on the upper end of the "V"-shaped extrusion rod (24). The lower clamp (21) and the right clamp (23) are fixed to the operating table by bolts. The second clamp (2) is used to simultaneously clamp five specimens with a specification range of φ40~70mm. The new probe (3) includes a connecting piece (31) and a measuring needle (32). One end of the measuring needle (32) is sleeved in the connecting piece (31) and locked by a top screw (33). The measuring needle (32) adopts SKD61 tool steel probe material. The shape and size of the first "V"-shaped splint (11) are the same as those of the second "V"-shaped splint (12); a "V"-shaped opening (111) is provided on the first "V"-shaped splint (11); the angle of the "V"-shaped opening (111) is the same as the angle of the outer edge of the first adjustment splint (13); the first adjustment splint (13) is engaged at the "V"-shaped opening (111); the first adjustment splint (13), the second adjustment splint (14) and the third adjustment splint (15) are all "V"-shaped; the angle of the inner edge of the first adjustment splint (13) is the same as the angle of the outer edge of the second adjustment splint (14); the angle of the inner edge of the second adjustment splint (14) is greater than the angle of the inner edge of the third adjustment splint (15); and the angle of the outer edge of the third adjustment splint (15) is the same as the angle of the "V"-shaped opening (111).
2. A rapid processing device for low-magnification and hardness test specimens of round bar products according to claim 1, characterized in that: A first locking bolt (41) is provided on the first telescopic pressure plate (4), the length of the first locking bolt (41) is greater than 60 mm, one end of the first locking bolt (41) is connected to the first pressure fixing member (42), and the other end of the first locking bolt (41) is connected to the first pressure strip (43), and the first pressure strip (43) is locked by a locking nut on the first locking bolt (41).
3. A rapid processing device for low-magnification and hardness test specimens of round bar products according to claim 2, characterized in that: A second locking bolt (51) is provided on the second telescopic pressure plate (5), one end of the second locking bolt (51) is connected to the second pressure fixing member (52), and the other end of the second locking bolt (51) is connected to the second pressure strip (53), the length of the second pressure strip (53) is 60 mm longer than the width of the left clamping plate (22), and the second pressure strip (53) is locked by the locking nut on the second locking bolt (51).
4. A rapid processing device for low-magnification and hardness test specimens of round bar products according to claim 3, characterized in that: A third locking bolt (61) is provided on the third telescopic pressure plate (6), one end of the third locking bolt (61) is connected to the second pressure fixing member (52), and the other end of the third locking bolt (61) is connected to the third pressure strip (62), the length of the third locking bolt (61) is greater than 90 mm, and the third pressure strip (62) is locked by a locking nut on the third locking bolt (61).
5. The rapid processing device for low-magnification and hardness test specimens of round bar products according to claim 4, characterized in that: The "V"-shaped extrusion rod (24) is provided with a cross bar (241), one end of the cross bar (241) is provided at the upper end of the right splint (23), and the bottom of the other end of the cross bar (241) is connected to a "V"-shaped pressing plate (242), and the "V"-shaped pressing plate (242) is provided between the left splint (22) and the right splint (23). The length of the left splint (22) is longer than the length of the right splint (23), and the length of the lower splint (21) is 140 mm longer than the width of the left splint (22).
6. A rapid processing method for low-magnification and hardness specimens of round bar products, characterized by: The rapid processing device for low-magnification and hardness test specimens of round bar products according to claim 1 comprises the following steps: S1. First, select and prepare the sample. Saw the selected sample with a size of φ40~150mm horizontally into full-section circular pancake-shaped samples with a height of 35~50mm and a tolerance of ±1mm for the ends. S2. Use 960a high-speed milling equipment to process the surface of the sample. The processing steps are as follows: S21. Samples are loaded in different grades according to different sample specifications. For samples with a specification range of φ140~150mm, the sample is loaded through the existing clamp with a stroke range of φ140~150mm, and one sample is loaded at a time. For samples with a specification range of φ70~130mm, the sample is loaded through the first clamp (1), and one sample is loaded at a time. For samples with a specification range of φ40~70mm, the sample is loaded through the second clamp (2), and five samples are loaded at the same time. S22. Turn on the cycle start button to measure the height zero position. Enter the sample diameter into the program and automatically capture three points on the surface to be measured that are 120 degrees apart. Take the distance from the center of the circle that is 80% of the sample radius as the reference point, obtain the sample height information, and establish the reference zero position reference surface. If the three points are not in the same horizontal plane, the vertical coordinate of the lowest point is used as the reference zero position. S23, set the milling cut amount, measure the reference zero position reference surface through the new probe (3), and process 1.5mm downward based on the zero position to complete the rapid processing test of the low-magnification and hardness specimens of the round bar product.
Citation Information
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