CN110579382A - Pressing cutter for pressing DWTT sample notch and using method thereof - Google Patents
Pressing cutter for pressing DWTT sample notch and using method thereof Download PDFInfo
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- CN110579382A CN110579382A CN201910604462.7A CN201910604462A CN110579382A CN 110579382 A CN110579382 A CN 110579382A CN 201910604462 A CN201910604462 A CN 201910604462A CN 110579382 A CN110579382 A CN 110579382A
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- pressing
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- blade
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- 238000003825 pressing Methods 0.000 title claims abstract description 80
- 238000000034 method Methods 0.000 title claims description 11
- 238000012360 testing method Methods 0.000 claims abstract description 39
- 230000003746 surface roughness Effects 0.000 claims description 4
- 238000000748 compression moulding Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 2
- 238000005336 cracking Methods 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
the invention discloses a pressing knife for pressing DWTT sample notches, which comprises a base body (11) and a knife edge (12) of a pressing knife (1), wherein the base body (11) is a cuboid, and the side edge of the upper part of the base body (11) is provided with a chamfer (11 b); the bottom surface (11 c) of the base body (11) is provided with a groove (11 a), the middle part of the groove (11 a) is provided with a convex blade (12), the blade (12) is V-shaped and extends out of the bottom surface (11 c) of the base body (11), the vertical distance between the blade tip (12 a) and the bottom surface (11 c) is basically consistent with the depth of a sample gap, and the angle of the blade (12) is basically consistent with the angle of the sample gap. The invention has the advantages of meeting the requirements of the angle and the depth of the notch, ensuring the quality of the notch, improving the quality and the test efficiency of the press cutter, reducing the phenomenon of warping and cracking of the press cutter and saving the cost.
Description
Technical Field
The invention relates to the technical field of DWTT test equipment, in particular to a pressing knife for pressing a DWTT test sample notch and a using method thereof.
background
The Drop Weight Tear Test (DWTT) is a test item for characterizing the toughness and brittleness characteristics of materials, is mainly used for low-temperature brittleness test and research of metal materials, and is widely applied to toughness evaluation of pipeline steel as one of quality acceptance indexes of steel pipes because the result obtained by the test method is identical with the result of a pipeline object blasting test.
according to the test standard, the sample gap is required to meet the standard requirement. In order to press the required sample notch, a pressing knife with the shape and the strength meeting the requirements is needed. The quality of the sample notch depends on the properties of the surface roughness, precision, hardness and the like of the pressing knife. The existing pressing knife often causes that the angle and the depth of a notch do not meet the requirements due to the defects of the performance of the pressing knife, and even frequently generates the phenomenon of inclination; meanwhile, in the process of pressing the notch, the blade is warped or cracked due to insufficient hardness of the blade, so that the quality of the notch cannot be guaranteed, and the test efficiency is reduced.
Disclosure of Invention
the invention aims to solve the problems that the existing pressing knife is low in test efficiency and cannot ensure the notch quality, and provides a pressing knife for pressing DWTT sample notches and a using method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
a pressing knife for pressing DWTT sample notches comprises a base body and a knife edge of the pressing knife and is characterized in that:
The matrix is a cuboid, a chamfer is arranged on the side edge of the upper part of the matrix, and the chamfer is 45 degrees, so that the pressing cutter can be better fit with the testing machine, and the stress of the pressing cutter is uniform;
The bottom surface of the base body is provided with a groove, the middle part of the groove is provided with a convex cutting edge, the cutting edge is V-shaped and extends out of the bottom surface of the base body, and the vertical distance between the cutting edge and the bottom surface is basically consistent with the depth of the notch of the sample, so that the depth requirement of pressing the notch is ensured;
The angle of the cutting edge is 45 degrees +/-2 degrees so as to meet the angle requirement of pressing a notch;
the surface roughness Ra0.8 of the cutting edge is 58 ~ 65HRC, so that the smoothness and the wear resistance of the pressing cutter are improved.
the pressing knife is integrally formed.
In order to further achieve the object of the invention, the use method of the pressing knife for pressing the notch of the DWTT test sample is further provided, and is characterized by comprising the following steps:
a. The pressing cutter is manufactured according to the performance size and the structure of the pressing cutter, so that the requirements on the angle, the depth, the finish and the hardness of the cutting edge are met;
b. The pressing cutter is directly arranged on a testing machine for pressing a sample notch and is fixed by a bolt;
c. Placing the sample under the pressing knife according to the test requirements, wherein the placing position is accurate;
d. Starting the testing machine, and performing one-step compression molding on the notch;
e. and taking out the pressed notch sample, placing the notch sample to a specified position, carrying out the next DWTT test, and placing the next sample for continuing the test until the test is completely finished.
compared with the prior art, the invention has the beneficial effects that: through integrated into one piece's pressing tool, loading and unloading and change are more convenient, and the angle and the degree of depth of sample breach have highly been ensured to the angle of cutting edge, and the smooth finish of cutting edge prevents to take place to glue the phenomenon of sword among the breach pressing process, ensures the integrality and the validity of sample breach to guarantee DWTT drop hammer tear test's validity and accuracy, this device need not to change other test equipment simultaneously, has saved the cost.
drawings
FIG. 1 is a front view of a pressing blade for pressing notches in a DWTT test specimen according to the present invention;
FIG. 2 is a side view of a pressing blade of the present invention for pressing notches in a DWTT specimen;
FIG. 3 is a bottom view of a pressing blade for pressing notches in a DWTT test specimen according to the present invention;
fig. 4 is an enlarged view of the structure of the cutting edge of the pressing knife of the present invention.
Detailed Description
example 1
In order to make the present invention more clear, the following is a further description of the pressing knife for pressing DWTT specimen notches and the method of using the same according to the present invention, and the specific embodiments described herein are only for explaining the present invention and are not intended to limit the present invention.
referring to fig. 1 and 2, a pressing knife for pressing DWTT specimen notches comprises a base body 11 and a blade 12 of the pressing knife 1, and is characterized in that:
The base body 11 is a cuboid, a chamfer 11b is arranged on the side edge of the upper part of the base body 11, and the angle alpha of the chamfer 11b is 45 degrees, so that the press cutter is better matched with the testing machine, and the stress of the press cutter is uniform;
Referring to fig. 1, 2 and 3, a groove 11a is formed in the bottom surface 11c of the base 11, a protruding blade 12 is arranged in the middle of the groove 11a, the blade 12 is V-shaped, the blade 12 extends out of the bottom surface 11c of the base 11, and the vertical distance between the blade 12 and the bottom surface 11c is substantially the same as the depth of a sample notch, so as to ensure the depth requirement of the notch;
referring to fig. 4, the angle β of the blade 12 is 45 ° to meet the angle requirement of pressing the notch;
the surface roughness Ra0.8 of the cutting edge 12 is 62HRC, so that the smoothness and the wear resistance of the pressing cutter are improved.
The pressing knife 1 is integrally formed.
The invention also provides a method for pressing a notch of a test sample by DWTT by using the pressing knife, which is characterized by comprising the following steps:
a. the pressing cutter is manufactured according to the performance size and the structure of the pressing cutter, so that the requirements on the angle, the depth, the finish and the hardness of the cutting edge are met;
b. The pressing cutter is directly arranged on a testing machine for pressing a sample notch and is fixed by a bolt;
c. placing the sample under the pressing knife according to the test requirements, wherein the placing position is accurate;
d. Starting the testing machine, and performing one-step compression molding on the notch;
e. and taking out the pressed notch sample, placing the notch sample to a specified position, carrying out the next DWTT test, and placing the next sample for continuing the test until the test is completely finished.
In the invention, the total length of the pressing knife 1 is 60mm, the width is 29.5 +/-0.2 mm, the thickness of the substrate 11 is 20mm, the height of the cutting edge 12 is 5.1 +/-0.5 mm, the notch angle of the pressed sample is 45 degrees, and the depth is 5 mm: through integrated into one piece's pressing tool, loading and unloading and change are more convenient, and the angle and the degree of depth of sample breach have highly been ensured to the angle of cutting edge, and the smooth finish of cutting edge prevents to take place to glue the phenomenon of sword among the breach pressing process, ensures the integrality and the validity of sample breach to guarantee DWTT drop hammer tear test's validity and accuracy, this device need not to change other test equipment simultaneously, has saved the cost.
in addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (7)
1. A pressing knife for pressing DWTT sample notches comprises a base body (11) and a knife edge (12) of the pressing knife (1), and is characterized in that:
the base body (11) is a cuboid, and the side edge of the upper part of the base body (11) is provided with a chamfer (11 b);
The bottom surface (11 c) of the base body (11) is provided with a groove (11 a), the middle part of the groove (11 a) is provided with a convex blade (12), the blade (12) is V-shaped and extends out of the bottom surface (11 c) of the base body (11), the vertical distance between the blade tip (12 a) and the bottom surface (11 c) is basically consistent with the depth of a sample gap, and the angle of the blade (12) is basically consistent with the angle of the sample gap.
2. a pressing knife for pressing DWTT specimen notches according to claim 1, characterized in that:
the angle of the cutting edge (12) is 45 degrees +/-2 degrees.
3. A pressing knife for pressing DWTT specimen notches according to claim 1, characterized in that: the surface roughness Ra0.8 of the blade (12).
4. The pressing knife for pressing DWTT test piece notches according to claim 1 is characterized in that the hardness requirement of the material of the cutting edge (12) is 58 ~ 65 HRC.
5. A pressing knife for pressing DWTT specimen notches according to claim 1, characterized in that: the pressing knife (1) is integrally formed.
6. a pressing blade for pressing DWTT specimen notches according to claim 1 ~ 5, characterized in that the chamfer (11 b) is 45 °.
7. a method of using a spatula for pressing DWTT specimen notches as recited in any one of claims 1 ~ 5, comprising the steps of:
a. The pressing cutter is manufactured according to the performance size and the structure of the pressing cutter, so that the requirements on the angle, the depth, the finish and the hardness of the cutting edge are met;
b. the pressing cutter is directly arranged on a testing machine for pressing a sample notch and is fixed by a bolt;
c. Placing the sample under the pressing knife according to the test requirements, wherein the placing position is accurate;
d. starting the testing machine, and performing one-step compression molding on the notch;
e. and taking out the pressed notch sample, placing the notch sample to a specified position, carrying out the next DWTT test, and placing the next sample for continuing the test until the test is completely finished.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910604462.7A CN110579382A (en) | 2019-07-05 | 2019-07-05 | Pressing cutter for pressing DWTT sample notch and using method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910604462.7A CN110579382A (en) | 2019-07-05 | 2019-07-05 | Pressing cutter for pressing DWTT sample notch and using method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110579382A true CN110579382A (en) | 2019-12-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910604462.7A Pending CN110579382A (en) | 2019-07-05 | 2019-07-05 | Pressing cutter for pressing DWTT sample notch and using method thereof |
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| CN (1) | CN110579382A (en) |
Citations (12)
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|---|---|---|---|---|
| CN2874470Y (en) * | 2006-03-24 | 2007-02-28 | 宝山钢铁股份有限公司 | Combined press knife capable of control depth |
| CN101387590A (en) * | 2007-09-12 | 2009-03-18 | 威海市试验机制造有限公司 | Sample break pressing machine |
| CN103954483A (en) * | 2014-03-18 | 2014-07-30 | 西安交通大学 | Superhigh-strength steel plate-shaped fatigue testing specimen, clamped position processing method and high-cycle fatigue testing method of superhigh-strength steel plate-shaped fatigue testing specimen |
| CN203853620U (en) * | 2014-06-10 | 2014-10-01 | 哈尔滨汽轮机厂有限责任公司 | V impacting specimen broaching tool |
| CN204027947U (en) * | 2014-07-29 | 2014-12-17 | 上海宝钢工业技术服务有限公司 | The sample anvil block structure of Charpy impact machine tester |
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| CN205949881U (en) * | 2016-08-30 | 2017-02-15 | 哈尔滨汽轮机厂有限责任公司 | A special cutter holder that is used for major diameter pipeline mouth of pipe chamfer |
| CN107297602A (en) * | 2017-08-04 | 2017-10-27 | 北京首钢股份有限公司 | A kind of processing method of the special push type broach of Drop test pieces |
| CN207946283U (en) * | 2018-03-27 | 2018-10-09 | 北京首钢股份有限公司 | Hammer body support construction and drop hammer tester |
| CN208223957U (en) * | 2018-06-07 | 2018-12-11 | 西安石油大学 | A kind of gap on samples in drop weighted tear tests detection device |
| CN210604088U (en) * | 2019-07-05 | 2020-05-22 | 南京钢铁股份有限公司 | Pressing knife for pressing DWTT sample notch |
-
2019
- 2019-07-05 CN CN201910604462.7A patent/CN110579382A/en active Pending
Patent Citations (12)
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