CN101592569B - Method for processing standard impact test sample with Charpy V-notch - Google Patents
Method for processing standard impact test sample with Charpy V-notch Download PDFInfo
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- CN101592569B CN101592569B CN2009100628081A CN200910062808A CN101592569B CN 101592569 B CN101592569 B CN 101592569B CN 2009100628081 A CN2009100628081 A CN 2009100628081A CN 200910062808 A CN200910062808 A CN 200910062808A CN 101592569 B CN101592569 B CN 101592569B
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Abstract
The invention relates to the field of the test of mechanical properties, and discloses a method for processing a standard impact test sample with a Charpy V-notch. The method comprises the following steps: adopting a high-toughness steel plate as a standard sample raw material, processing the steel plate into a blank material with the width of 56 mm and the thickness of 10.5 mm, using a surface grinding machine to grind the outer surface of the blank material, ensuring that the surface roughness Ra is less than or equal to 1.6 mu m, and dividing the blank material into a semi-finished product along the length direction; adopting a high-precision optical curve grinding machine to cut a V-notch on the middle part of the semi-finished product according to the regulations; then re-dividing the semi-finished product provided with the V-notch at intervals 11 mm along the length direction; and using the surface grinding machine to finally process the width of the sample to 10+/-0.05 mm. The geometric dimension, particularly the processing quality of a V-notch position of the standard sample produced the method is superior to the stipulation in national standard GB/T18658-2002; and the contour tolerance, particularly the alignment of the notch can keep strict consistency, which creates objective conditions for further reducing the energy fluctuation range of the standard sample.
Description
Technical field
The present invention relates to the Mechanics Performance Testing field, specifically be applied to the Charpy impact machine tester metering field.
Background technology
Impact testing machine is the common apparatus of frequent use of Mechanics Performance Testing, is to keep testing machine to measure the accuracy of indicating value, and testing machine must carry out verification and meet related request with the accuracy of determining equipment.At present developed country and ISO (International Standards Organization) ISO require annually to come the verification impact testing machine with the ballistic work standard deviation less than 5% v-notch shock sample.Facts have proved that shock sample is effectively for the precision of checking shock machine, adopt standard specimen can find the variety of issue that shock machine exists: for example the testing machine standoff distance is bigger than normal; The testing machine support position and the pendulum centre of percussion depart from etc.; Therefore it is necessary regularly adopting and driving v-notch shock sample verification shock machine.
The U.S. just proposed with normal of impact sample verification impact testing machine as far back as the sixties in last century, and develop the summer by AUS and try out than v-notch normal of impact sample, at present the normal of impact sample of the U.S. divides three energy levels such as low, height and superelevation, and its standard deviation is between 2%～4%; France nineties in 20th century, also batch making went out the ballistic work coefficient of variation less than 5% v-notch shock sample, and formulated standard-required with standard specimen verification impact testing machine.In GB/T18658-2002 of new revision " Charpy impact machine tester check with summer than breach standard sample " and GB/T3808-2002 " check of Charpy impact machine tester " all clearly regulation need adopt standard impact specimen to come the calibration test machine.Present domestic Baosteel adopts the hot-rolled low carbon steel plate to make the internal control shock sample of opening v-notch, and the in kind horizontal coefficient of variation of this standard specimen has been brought into play certain effect in actual applications less than 3%.But the crudy at Baosteel standard specimen v-notch position and the regulation of GB GB/T18658-2002 remain in certain gap, and main deficiency is that the indexs such as angle, profile and root smooth finish of v-notch are undesirable.
Should be noted that: because the stress state of v-notch sample root of notch when Dynamic Fracture is very complicated, the fluctuation range of the inhomogeneous merit that impacts of the uncertainty in crack propagation path and sample autologous tissue is bigger during sample fracture, therefore develops satisfactory v-notch shock sample and has big technical difficulty.For satisfying technical requirement, not only to select the comparatively stable standard specimen material of autologous tissue, the difference that meanwhile as far as possible reduces between the sample profile also is very important, wherein the crudy of v-notch is very crucial for this.If adopt processing technology (milling cutter or broaching tool) the processing v-notch of common impact specimen to be difficult to guarantee that crudy satisfies the requirement of GB/T18658-2002, main deficiency is that the indexs such as the degree of depth, angle, profile and root smooth finish of breach are undesirable, therefore need take some special measures on the processing technology of standard specimen.The processing cost that this has increased standard specimen has to a great extent reduced working (machining) efficiency.
For fear of the excessive shortcoming of v-notch standard specimen energy hunting, simplify manufacture craft, in recent years, domestic Iron and Steel Research Geueral Inst has also been developed camber (arch form) notch shock standard model.But it should be noted that, the routine check mode of the impact process of camber standard specimen and common impact specimen does not keep strict conformance, and practical application shows that also this standard specimen lacks enough susceptibility (bigger than normal as the sample standoff distance, sample die misalignment etc.) to some equipment deficiencies.Directive document " the Installing that provides in Unite States Standard (USS) Institute for Research and Technology (be called for short NIST) in addition, Maintaining, and Verifying YourCharpy Impact Machine " spell out: owing to utilize standard specimen in verification process, to have " compensatory error ", it is standard specimen some defective to equipment, lack enough susceptibility as sample die misalignment, tup die misalignment, swing arm bending etc., if rely on standard impact energy values K merely
REquipment is examined and determine, and its result can be relatively loose.For the duty of thoroughly evaluating equipment, need thrust the inspection of having no progeny of sample, in this document, describe the inspection item of having no progeny of standard specimen in detail.Project relates to anvil block wearing and tearing (worn anvils), sample die misalignment (Off-CenterSpecimen), tup die misalignment all many-sides such as (Off-Center Striker).Owing to camber standard specimen self, it fails to be separated into two independent parts under room temperature or cryogenic conditions, just can't carry out " inspection of having no progeny " to it, and this also is to hinder the key factor that arc standard specimen large-scale promotion is used.
There is following shortcoming in actual applications in prior art:
1. on the camber standard specimen stricti jurise of present domestic employing and do not meet the technical requirement of GB/T18658-2002, this sample does not only satisfy the regulation of GB/T18658-2002 in shape, the more important thing is that it can't realize real fracture in impact process, break through jaw from standard specimen centering until standard specimen, there is notable difference in standard specimen and testing machine time of day and daily operating mode between the two.Ignored the influence that the material fracture is caused himself and equipment owing to this standard specimen is subjective, caused standard specimen to some equipment deficiency,, sample die misalignment bigger than normal as the sample standoff distance, tup die misalignment etc. lack enough susceptibility, if rely on it that equipment is examined and determine merely, its result is obviously relatively loose.The more important thing is that the arc standard specimen can't be separated into two independent parts, just can't thrust the inspection of having no progeny of sample.
2. the energy rank of existing standard specimen covers incomplete, and the ceiling capacity rank that no matter is the home or overseas standard specimen at present is about 220J, and the standard specimen of impact energy about 300J do not seen formal report.(widespread usage of rated energy＞300J), existing standard specimen can't satisfy such testing machine needs of calibrating indirectly, and the standard specimen of being badly in need of developing about 300J is filled up technological gap along with domestic and international macro-energy balance weight impact testing machine.
Summary of the invention
Technical matters to be solved by this invention provides a kind of job operation of standard impact test sample with Charpy V-notch, it has the high tenacity of employing material and processes raw material as standard specimen, offered v-notch according to regulation among the GB/T18658-2002 thereon, standard specimen is improved " susceptibility " of equipment latent defect; Utilize high-precision optical profile grinder processing v-notch, make the crudy of gap portions be better than every index among the GB/T18658-2002 greatly; Adjusted manufacturing procedure, the operation that adopts first grinding semi-manufacture breach again semi-manufacture to be cut apart, make standard specimen contour tolerance particularly breach aspect neutral, be consistent, thereby the appearance difference between sample is dropped to minimum level, create the characteristics of objective condition for further reducing standard specimen energy hunting scope.
For solving the problems of the technologies described above, the job operation of a kind of standard impact test sample with Charpy V-notch provided by the invention is characterized in that, processes according to following step:
Preferred job operation is to process according to following step:
To further being optimized for of above-mentioned job operation, step 4 is, adopts the every along its length once more interval 11mm of line cutting to cut the semi-manufacture of holding v-notch successfully, and dividing the semi-manufacture width that cuts is 10.5mm, thickness is 10mm ± 0.05mm, and length is 55
-0.10 0.00Mm.
The invention has the advantages that:
1. the standard specimen strictness that processes of the present invention has been offered v-notch by the regulation among the GB/T18658-2002, and the routine check of the use-pattern of standard specimen and common impact specimen has kept strict conformance like this; V-notch standard specimen self increases to " susceptibility " of equipment latent defect simultaneously, can utilize particularly that complete brittle failure becomes the two independent parts sample to carry out the inspection of having no progeny of standard specimen under the low temperature, and the inspection of having no progeny can well remedy the not good enough problem of standard specimen susceptibility, thereby the comprehensive more and science of the evaluation work that makes impact testing machine, these aspects obviously have more advantage than domestic present camber standard specimen in usefulness.
2. for the processing of v-notch, domestic present conventional processing technology normally adopts broaching machine or milling machine to carry out, problems such as the indexs such as the degree of depth, angle, profile and root smooth finish of ubiquity breach processing are undesirable, the material object by large tool microscope detects and shows that the gap portions technical indicator of such sample can't satisfy the requirement of GB/T18658-2002.And job operation provided by the present invention adopts high-precision optical profile grinder processing standard specimen v-notch, and the breach crudy obviously is better than every index of GB/T18658-2002, and this is that conventional processing technology is beyond one's reach.
3. when cooperating the high-accuracy optical contour grinder of employing, job operation provided by the present invention has also been made adjustment to existing manufacturing procedure.Take first grinding sample base breach, the operation that the sample base is cut apart then, can guarantee like this standard specimen contour tolerance particularly breach aspect neutral, be consistent, thereby the difference between the sample profile is dropped to minimum level, for the energy hunting scope that further reduces standard specimen has been created objective condition.Data show that the standard deviation with batch standard specimen can be controlled in 3%.
4. the clean deck of boat steel that utilizes high tenacity is as the standard specimen material, and it is carried out normalizing treatment, makes material from having on the preferable inhomogeneity basis better stability being arranged.Provide a kind of energy level to reach the job operation of the standard impact test sample with Charpy V-notch of 300J, can process the shock sample about 300J, filled up the domestic and international technological gap of superenergy standard specimen (energy rank ≈ 300J), even facts have proved through after the depositing of half a year, the energy value of standard specimen still can be stabilized in 298J ± 9J, and standard deviation can be controlled in 3%.
5. adopt the mode of line cutting can save material, reduce difficulty of processing.
The standard specimen produced by the present invention all offers v-notch, the routine check of its use-pattern and common impact specimen keeps strict conformance, simultaneously v-notch standard specimen self increases to " susceptibility " of equipment latent defect, and can utilize that complete brittle failure becomes the two independent parts sample to carry out the inspection work of having no progeny of standard specimen under the low temperature.
Description of drawings
Below in conjunction with the drawings and specific embodiments technical scheme of the present invention is further described in detail.
Fig. 1 is the blank material side view of grinding.
Fig. 2 is for offering the semi-manufacture structural representation of v-notch.
Fig. 3 is for offering the semi-manufacture side view of v-notch.
Fig. 4 is an I portion enlarged drawing.
The synoptic diagram that Fig. 5 is cut apart for the semi-manufacture after will processing.
Wherein, 1-blank material, 2-blank material width, 3-blank material thickness, 4-offers the semi-manufacture of v-notch, 5-V type breach, 6-V type notch depth, 7-V type breach angle, 8-bottom curvature radius, 9-standard specimen finished product.
Embodiment
At first, adopt a kind of ductility steel plate as the standard specimen raw material, also can make for these standard specimen starting material: utilize the clean deck of boat steel of high tenacity as the standard specimen starting material by following manner, it is carried out normalizing treatment: heating-up temperature is 850 ℃～980 ℃, be incubated to place after 1～2 hour and carry out artificial aging more than 5 months, for heating-up temperature, preferred 950 ℃, for temperature retention time, preferred 1.5 hours.Material self is had on the preferable inhomogeneity basis better stability is arranged.Even facts have proved that the energy value of standard specimen still can be stabilized in about 300J through after the depositing of half a year, the standard deviation of standard specimen can be controlled in 3%.
Next, with reference to grinding blank material side view shown in Figure 1, be the blank material with the standard specimen materials processing after the normalizing treatment.The original size of blank material 1 is: width 2 is 57mm, and thickness 3 is 12mm, and length is not limit, and is the machining precision of guaranteeing that standard specimen is follow-up, and this blank material should keep enough process redundancy, and this process redundancy is 2mm.Preferably, the blank material 1 that processes is of a size of: 210mm (length) * 56mm (width 2) * 10.5mm (thickness 3), be of a size of the direction of 56mm, width 2 directions that are blank material 1 are deck of boat mother metal rolling direction, at this moment, width 2 and thickness 3 directions all leave the process redundancy about 0.5mm.
Adopt 4 outside surfaces of surface grinding machine to blank: the outside surface that thickness direction and length direction constitute, and the outside surface of Width and length direction formation carries out grinding, makes the roughness R of each face of blank
a≤ 1.6 μ m, the blank after will processing is subsequently cut apart along its length, makes it become thickness 3 and is 10mm ± 0.05mm, and width 2 is 55
-0.10 0.00The semi-manufacture 4 of mm.
For blank being divided into half-finished operation: when adopting above-mentioned preferred length dimension to be 210mm, along the 210mm length direction, average mark is slit into 3 long semi-manufacture 4 of each 70mm with it, and these semi-manufacture 4 are of a size of: 70mm (length) * 55
-0.10 0.00Mm (width) * 10mm ± 0.05mm (thickness).
With reference to the semi-manufacture structural representation of offering v-notch shown in Figure 2, the blank material side view of offering v-notch shown in Figure 3 and I portion enlarged diagram shown in Figure 4, adopt the high-precision optical profile grinder that semi-manufacture 4 are opened v-notch 5 according to the regulation among the GB/T18658-2002, the degree of depth 6 of breach is guaranteed that (the back breach cross-sectional height that converts is 8mm ± 0.05mm) at 2mm ± 0.05mm, breach angle 7 is 45 ° ± 1 °, and breach bottom curvature radius 8 is 0.25mm ± 0.025mm; Surfaceness R on the breach face
a≤ 1.6 μ m.The breach crudy need adopt large tool microscope and roughmeter to check.
Then, the synoptic diagram that semi-manufacture after will processing according to Fig. 5 are cut apart adopts the lines cutting to cut along the every interval 11mm of 70mm length direction once more the semi-manufacture 4 of holding v-notch successfully, and dividing the half-finished width that cuts is 10.5mm, thickness is 10mm ± 0.05mm, and length is 55
-0.10 0.00Mm.
At last, the semi-manufacture that branch is cut adopt surface grinding machine that its cut surface is carried out grinding, make the roughness R of cut surface
a≤ 1.6 μ m, this moment standard specimen latter two outside surface also in this step, carried out processing (all the other each faces are finished) in step 2 and step 3.The standard specimen width finally is processed into 10mm ± 0.05mm, and so far standard specimen has been finished all procedure of processings.
Should be noted that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (3)
1. the job operation of a standard impact test sample with Charpy V-notch is characterized in that, processes according to following step:
Step 1 adopts ductility steel plate as the standard specimen raw material, at first is processed into the blank material of width 56mm, thickness 10.5mm, and for guaranteeing the following process precision, this blank material leaves certain process redundancy;
Step 2 adopts four outside surfaces of surface grinding machine to blank, and promptly two outside surfaces of thickness direction and length direction formation and carry out grinding by two outside surfaces that Width and length direction constitute make the roughness R of each face of blank
a≤ 1.6 μ m, it is 10mm ± 0.05mm that the blank after will processing subsequently is cut into thickness along its length, width is
Semi-manufacture;
Step 3, adopt the high-precision optical profile grinder to open v-notch according to the regulation among the GB/T18658-2002 at half-finished middle part, the indentation, there cross-sectional height is 8mm ± 0.05mm, and the breach angle is 45 ° ± 1 °, and breach bottom curvature radius is 0.25mm ± 0.025mm; Surfaceness R on the breach face
a≤ 1.6 μ m;
Step 4, every along its length once more interval 11mm cuts with the semi-manufacture of holding v-notch successfully, and dividing the half-finished width that cuts is 10.5mm, and thickness is 10mm ± 0.05mm, and length is
Step 5, the semi-manufacture that branch is cut adopt surface grinding machine that its cut surface is carried out grinding, make the roughness R of cut surface
a≤ 1.6 μ m finally are processed as 10mm ± 0.05mm with the sample width, divide the semi-manufacture that cut finally to be processed into the standard specimen finished product like this.
2. the job operation of a standard impact test sample with Charpy V-notch is characterized in that, processes according to following step:
Step 1 adopts the clean deck of boat steel of high tenacity as the standard specimen starting material.At first it is carried out normalizing treatment: heating-up temperature is 850 ℃～980 ℃, be incubated after 1～2 hour place carry out artificial aging more than 5 months after, being processed into width is 56mm～58mm, and thickness is the blank material of 10.5mm～13mm, and the blank material leaves the process redundancy of 2mm～3mm;
Step 2 adopts four outside surfaces of surface grinding machine to blank, and two outside surfaces that promptly are made of thickness direction and length direction and carry out grinding by two outside surfaces that Width and length direction constitute make the roughness R of each face of blank
a≤ 1.6 μ m, it is 10mm ± 0.05mm that the blank after will processing subsequently is cut into thickness along its length, width is
Semi-manufacture;
Step 3, adopt the high-precision optical profile grinder to open v-notch according to the regulation among the GB/T18658-2002 at half-finished middle part, the indentation, there cross-sectional height is 8mm ± 0.05mm, and the breach angle is 45 ° ± 1 °, and breach bottom curvature radius is 0.25mm ± 0.025mm; Surfaceness R on the breach face
a≤ 1.6 μ m;
Step 4, every along its length once more interval 11mm cuts with the semi-manufacture of holding v-notch successfully, and dividing the half-finished width that cuts is 10.5mm, and thickness is 10mm ± 0.05mm, and length is
Step 5, the semi-manufacture that branch is cut adopt surface grinding machine that its cut surface is carried out grinding, make the roughness R of cut surface
a≤ 1.6 μ m finally are processed as 10mm ± 0.05mm with the sample width, divide the semi-manufacture that cut finally to be processed into the standard specimen finished product like this.
3. the job operation of a kind of standard impact test sample with Charpy V-notch as claimed in claim 1 or 2 is characterized in that,
When the every along its length once more interval 11mm of semi-manufacture that will hold v-notch in the step 4 successfully cut, the mode of cutting that is adopted was the line cutting.
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102825423B (en) * | 2012-09-03 | 2015-11-11 | 上海材料研究所 | A kind of processing method of low stress fatigue sample |
| CN102980788B (en) * | 2012-11-14 | 2014-11-19 | 厦门钨业股份有限公司 | Preparation method for specimen capable of being directly used for X-ray diffraction (XRD) detecting phase compositions |
| CN103196715B (en) * | 2013-03-06 | 2016-08-03 | 中国石油天然气集团公司 | A kind of processing method of Charpy bar |
| CN106404476B (en) * | 2016-08-22 | 2019-03-19 | 宁夏共享集团股份有限公司 | A method of low energy impacts value self-correcting fiducial mark block is made with ferritic spheroidal graphite cast iron |
| CN108213863B (en) * | 2017-12-13 | 2020-04-24 | 北京市计量检测科学研究院 | Preparation method of high-energy/ultrahigh-energy Charpy V-shaped notch standard sample |
| CN110044667B (en) * | 2018-01-16 | 2021-07-16 | 宝山钢铁股份有限公司 | Preparation method of corrosion sample for metal composite plate welding joint |
| CN108956277B (en) * | 2018-08-29 | 2021-09-03 | 广州文冲船厂有限责任公司 | Centering tool for Charpy impact test and working method thereof |
| CN110082244A (en) * | 2019-05-15 | 2019-08-02 | 中国科学院金属研究所 | A kind of test impact specimen v-notch Alignment measuring device |
| CN112985939A (en) * | 2021-02-09 | 2021-06-18 | 芜湖造船厂有限公司 | Charpy impact sample processing method for Charpy impact test |
| CN112975281B (en) * | 2021-02-09 | 2022-06-07 | 芜湖造船厂有限公司 | Method for processing Charpy impact test sample |
| CN112985940A (en) * | 2021-02-09 | 2021-06-18 | 芜湖造船厂有限公司 | Method for processing Charpy impact test sample approved by welding process |
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