CN105136531B - For the compact tensile specimen of material properties test - Google Patents
For the compact tensile specimen of material properties test Download PDFInfo
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- CN105136531B CN105136531B CN201510439229.XA CN201510439229A CN105136531B CN 105136531 B CN105136531 B CN 105136531B CN 201510439229 A CN201510439229 A CN 201510439229A CN 105136531 B CN105136531 B CN 105136531B
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Abstract
The invention discloses a kind of compact tensile specimens for material properties test, including sample ontology, the upper surface of sample ontology be provided with straight down a width it is narrow and through sample ontology front and rear surfaces deep trouth, the design groove width of the deep trouth is 0.8 to 5mm, it is 0.02 to 0.2 to design the ratio of width to height, it is 10 to 35mm to design groove depth, and the design angle between left skew wall and right skew wall is 30 to 70 °, and the design radial of filleted corner is 0.02 to 0.6mm；Left straight wall is formed and is reached the surface roughness of below Ra1.6 by abrasive wheel forming grinding finishing with filleted corner with right straight wall and left skew wall, right skew wall；It is no more than 0.05 between the symmetry of center line and left skew wall and right skew wall with the symmetry error of the center line between left straight wall and right straight wall, error between the practical groove width of the deep trouth and design groove width is no more than ± 0.08mm, error between practical groove depth and design groove depth is no more than ± 0.05mm, and the error between the real radius and design radial of the filleted corner is no more than ± 0.05 °.
Description
Technical field
It is obtained the present invention relates to a kind of manufacturing method of material properties test compact tensile specimen and by this method
For the compact tensile specimen of material properties test.
Background technology
Plane strain fracture toughness KICFor testing experiment generally there are two types of sample, one kind is 3 points of strain sample (code name S of standard
(EB)), another is compact tensile specimen (code name C (T)).The basic structure of compact tensile specimen is known, that is, is included outer
Shape is generally the sample ontology of cuboid, and it is narrow and through sample that the upper surface of the sample ontology is provided with a width straight down
The deep trouth of ontology front and rear surfaces, the deep trouth include straight trough portion and the corners positioned at straight trough portion bottom, wherein, straight trough portion, which has, to be set
The symmetrical left straight wall of center line between the left side and right side of sample ontology and right straight wall are counted, corners has same
Sample design with the symmetrical left skew wall of the center line and right skew wall, the upper end of left skew wall and right skew wall respectively with left straight wall
And right straight wall lower end connection, it is connected between the lower end of left skew wall and the lower end of right skew wall by a filleted corner；In addition, trying
A pair of circular hole being symmetrically disposed at left and right sides of deep trouth is also provided on sample body.
Size in relation to wherein deep trouth in compact tensile specimen mainly have groove width, slot height, groove depth, left skew wall and right skew wall it
Between angle and filleted corner radius etc..Wherein, groove width refers to the width between left straight wall and right straight wall；Slot height refers to straight trough portion top
It holds to the distance of filleted corner bottom end；Groove depth refers to filleted corner bottom end to the distance of sample ontology lower surface.Due to tough in sample fracture
In property test process, specimen size, sample material, stress state, load mode, loading speed including above-mentioned size,
The factors such as test temperature and experimental enviroment can the test result of fracture toughness impact, therefore, in selection fracture toughness examination
When testing condition, it is necessary to as close possible to actual operating conditions and environment.That is, specimen size and required precision need accordingly
Designed according to actual operating conditions and environment.
Applicant of the present invention is developing a kind of compact tensile specimen for nuclear reactor pressure container, the sample before this
Nuclear radiation, nuclear corrosion are born in reactor, and then physical mechanical property can be caused to decline, to ensure normal reactor operation,
Do not occur nuclear leakage and nuclear pollution, it is specified that every two years taking out a certain proportion of sample progress mechanical test from reactor,
The mechanical performances such as the fracture toughness by testing these samples, so as to be analyzed test data to judge that can reactor after
Reforwarding row.The size of the compact tensile specimen has carried out respective design according to its special operating condition and application environment, wherein,
The design groove width of deep trouth be 0.8 to 5mm, design the ratio of width to height be 0.02 to 0.2, design groove depth be 10 to 35mm, and left skew wall with
Design angle between right skew wall is 30 to 70 °, and the design radial of filleted corner is 0.02 to 0.6mm；Simultaneously, it is desirable that the deep trouth
Form and position error very little, to ensure test accuracy.
Since the above-mentioned narrow depth of deep trouth width is big and required precision is again more much higher than the required precision of traditional sample (especially right
The key parameters required precisions such as groove width, groove depth, fillet radius and the symmetrical degree of deep trouth are high), therefore the manufacture of the sample
Difficulty is very big.Since external nuclear power technology development is more early, the compact tension specimen that according to reason saying have and can reach similar precision tries
Sample.However, according to the applicant understood, both at home and abroad to the manufacture of such compact tensile specimen always using pressure forming, chemical attack,
Electric spark or the processing method of wire cutting are molded deep trouth, and the deep trouth that these processing methods process is not achieved higher at all
Required precision.For this purpose, applicant's initiative employs abrasive wheel forming grinding, to be molded deep trouth, (according to general view, groove width is small
It is not easy to use wheel grinding in the deep trouth of 10mm, otherwise grinding wheel easily bursts apart, and abrasive dust discharge and grinding wheel cooling are also problem, are ground essence
Degree it is difficult to ensure that), meanwhile, for reduce to the greatest extent in grinding there may be the problem of, deep trouth shape and pre- is first cut out using wire cutting
A small amount of surplus is stayed, cutter is then engaged to grind advanced technician again, grinding wheel is grinding into definite shape aftershaping fine grinding deep trouth.But this
The deep trouth list of kind method processing differs 0.7mm or so for one with desired groove width always with regard to groove width, cannot meet the needs completely.
Invention content
Based on above-mentioned background, the technical problems to be solved by the invention are that providing a kind of improved material properties test uses
The manufacturing method of compact tensile specimen simultaneously provides a kind of compact tensile specimen for material properties test obtained by this method.
The accuracy of manufacture of deep trouth is very high in the sample and surface quality is preferable, the more preferable accuracy for ensureing fracture toughness test experiment.
The manufacturing method of the material properties test compact tensile specimen of the present invention, including finishing out the outer of sample ontology
Shape, roughing one extends straight down from the upper surface of the workpiece on the workpiece for finishing out sample ontology shape again
Width is narrow and runs through the deep trouth of the workpiece front and rear surfaces, the link then finished to the deep trouth, after finishing
Deep trouth includes straight trough portion and the corners positioned at straight trough portion bottom, and straight trough portion has design with the left side and right side of sample ontology
The symmetrical left straight wall of center line and right straight wall between face, corners have design with the symmetrical left side of the center line
The upper end of skew wall and right skew wall, left skew wall and right skew wall is connect respectively with left straight wall and right straight wall lower end, under left skew wall
It is connected between end and the lower end of right skew wall by filleted corner, the width between left straight wall and right straight wall is groove width, straight trough portion
Top to filleted corner bottom end distance is high for slot, and the distance of filleted corner bottom end to sample ontology lower surface is groove depth, and groove width/slot is a height of
The ratio of width to height, the design groove width of the deep trouth is 0.8 to 5mm, and design the ratio of width to height is 0.02 to 0.2, designs groove depth as 10 to 35mm, and
Design angle between left skew wall and right skew wall is 30 to 70 °, and the design radial of filleted corner is 0.02 to 0.6mm；
Wherein, the finishing of deep trouth is specifically comprised the following steps：
First, deep trouth is roughly ground
A, it selects the first grinding wheel that hardness is L to N grades and reconditioning is carried out to it using symmetrical reconditioning mode, after reconditioning
The actual (real) thickness of first grinding wheel (in the tolerance limit value and lower limiting value for not indicating design size, refers to set without exception than design groove width
Count basic size) it is narrow by 0.02 to 0.12mm；Then the straight trough portion is roughly ground with the first grinding wheel, by the left and right of the first grinding wheel during corase grinding
Center line holding between symmetrical center line and the left side and right side overlaps, the control of the rotating speed of the first grinding wheel be 3200 to
4000 revs/min, the control of the movement speed of the first grinding wheel is 15 to 40 ms/min, when the first grinding wheel is often along before sample ontology
Rear direction, which moves back and forth, then feeds down the first grinding wheel once more than primary, and each amount of feeding is 0.01 to 0.05mm, first
Grinding wheel often feeds down coolant of 2 to 4 sprays；
When b, if a walks reconditioning not by bull nose reconditioning at the first grinding wheel wheel rim wedge angle and pointed tips in place, using a left side
Right symmetrical reconditioning mode enters back into subsequent operation after carrying out secondary reconditioning to the first grinding wheel, the first grinding wheel sharp corner after secondary reconditioning
Actual angle in the range of design angle angle ± 2 ° between left skew wall and right skew wall, at the pointed tips of the first grinding wheel outside
Fillet real radius is in the range of the design radial ± 0.05mm of the filleted corner, if by the first grinding wheel wheel rim when a walks reconditioning
Bull nose reconditioning is then directly entered subsequent operation in place at wedge angle and pointed tips；The corners is roughly ground using the first grinding wheel,
The symmetrical center line of the first grinding wheel is overlapped with the center line holding between the left side and right side during corase grinding, first
For 3200 to 4000 revs/min, the movement speed control of the first grinding wheel is 15 to 40 ms/min for the rotating speed control of grinding wheel, when the
One grinding wheel often moves back and forth along the front-rear direction of sample ontology and then feeds down the first grinding wheel once more than primary, feeds every time
It is 0.01 to 0.05mm to measure, and the first grinding wheel often feeds down coolant of 2 to 4 sprays；
2nd, deep trouth is refined
C, it selects the second grinding wheel that hardness is L to N grades and reconditioning is carried out to it using symmetrical reconditioning mode, after reconditioning
The actual (real) thickness of second grinding wheel is smaller by 0.01 to 0.025mm than the upper limit value (upper limit value for referring to tolerance) for designing groove width；Use second
Grinding wheel refines the straight trough portion, and when fine grinding will be between the symmetrical center line of the first grinding wheel and the left side and right side
Center line keeps overlapping, and the rotating speed control of the first grinding wheel is 2800 to 3200 revs/min, and the movement speed control of the first grinding wheel is
10 to 18 ms/min, when the first grinding wheel often along the front-rear direction of sample ontology move back and forth more than primary then by the first grinding wheel to
Lower feeding is primary, and each amount of feeding is 0.001 to 0.005mm, and the first grinding wheel often feeds down coolant of 1 to 3 spray；
D, secondary reconditioning, the reality of the second grinding wheel sharp corner after secondary reconditioning are carried out to the second grinding wheel using symmetrical reconditioning mode
Border angle is in the range of design angle angle ± 2 ° between left skew wall and right skew wall, bull nose at the pointed tips of the second grinding wheel
Real radius is in the range of the design radial ± 0.05mm of the filleted corner；Then, the corners is refined using the second grinding wheel,
The symmetrical center line of the first grinding wheel is overlapped with the center line holding between the left side and right side during fine grinding, first
For 2800 to 3200 revs/min, the movement speed control of the first grinding wheel is 10 to 18 ms/min for the rotating speed control of grinding wheel, when the
One grinding wheel often moves back and forth along the front-rear direction of sample ontology and then feeds down the first grinding wheel once more than primary, feeds every time
It is 0.001 to 0.005mm to measure, and the first grinding wheel often feeds down coolant of 1 to 3 spray.
Further, in fine grinding deep trouth link in the above-mentioned methods, the repeatable operation of at least d steps more than twice,
When repetitive operation d is walked each time, it is used for processing after one piece of second new grinding wheel reconditioning can be used, and the newly used each time
The granularity of two grinding wheels should use successively suitable than the granularity smaller of previous second grinding wheel that uses, the i.e. granularity of the second grinding wheel according to it
Sequence is successively decreased successively.In this way, it can preferably ensure the radius of filleted corner and the machining accuracy of groove depth.
Generally by deep trouth described in wire cutting roughing, the deep trouth reserved margin after roughing is preferably the above method
0.2 to 0.5mm.In addition, the coolant in the step a, step b, step c and/or step d is preferably anti-using WD-40 dehumidifying
Become rusty lubricant." WD-40 dehumidifying slushing compound " is the commodity of WD-40 companies of the U.S..In process, inventor pays attention to
It arrives, the thermal energy that grinding wheel contact workpiece generates is higher, and since grinding wheel is very thin, the ratio of width to height of slot is larger, therefore grinding wheel thermal diffusivity is also poor；
The abrasive dust that grinding wheel generates when finishing easily is attached on the cutting face of grinding wheel to change the shape of grinding wheel and size, increases friction
Power, heating aggravation, and then grinding wheel adhesive performance is caused to change, the sand grains of sharp corner easily comes off, and abrasion is obvious.Cause
This, to solve the problems, such as that grinding wheel cooling and sand grains come off, inventor has tried out the oil base of both domestic and external ten several models, water base cooling
After liquid proving and comparisom, it is found that WD-40 dehumidifying slushing compounds can decompose, clean the abrasive dust of attachment, and play unexpected
Cooling effect, so as to ensure the high-quality and efficient of processing.In addition, the preferred promise of the first grinding wheel and the second grinding wheel in the above method
Pause grinding wheel, and the promise grinding wheel specifically refers to " NORTON " grinding wheel of French Sheng Ge spots group, wherein the concrete model of the first grinding wheel
Preferably WA80-LV- Φ 200*6* Φ 31.75 (product type of NORTON grinding wheels, similarly hereinafter), the concrete model of the second grinding wheel is excellent
It is selected as WA120-LV- Φ 200*6* Φ 31.75, and when the second grinding wheel successively uses two pieces or more, the second sand used at first
The concrete model of wheel is preferably WA120-LV- Φ 200*6* Φ 31.75, and the concrete model of the second grinding wheel then used is preferably
WA180-LV- Φ 200*6* Φ 31.75, hereafter again for WA240-LV- Φ 200*6* Φ 31.75, generally using above-mentioned three pieces the
Two grinding wheels.Applicant is found by experiment that, above-mentioned NORTON grinding wheels and WD-40 dehumidifying slushing compounds are used cooperatively,
Grinding wheel is not easy to burst apart, and bursts apart when wearing also unobvious, and using other a variety of grinding wheels instead then frequently and significant with wear phenomenon
It is more.
The compact tensile specimen of material fracture toughness testing experiment is used for as made from the above method, including sample ontology,
The upper surface of sample ontology be provided with straight down a width it is narrow and through sample ontology front and rear surfaces deep trouth, the deep trouth packet
Straight trough portion and the corners positioned at straight trough portion bottom are included, straight trough portion has design between the left side and right side of sample ontology
The symmetrical left straight wall of center line and right straight wall, corners have design with the symmetrical left skew wall of the center line and
The upper end of right skew wall, left skew wall and right skew wall is connect respectively with left straight wall and right straight wall lower end, lower end and the right side of left skew wall
It is connected between the lower end of skew wall by a filleted corner；Width between left straight wall and right straight wall is groove width, and straight trough portion top is extremely
Filleted corner bottom end distance is high for slot, and the distance of filleted corner bottom end to sample ontology lower surface is groove depth, and groove width/slot is a height of wide high
Than the design groove width of the deep trouth is 0.8 to 5mm, and it is 0.02 to 0.2 to design the ratio of width to height, and design groove depth is 10 to 35mm, and left oblique
Design angle between wall and right skew wall is 30 to 70 °, and the design radial of filleted corner is 0.02 to 0.6mm；Left straight wall and the right side are straight
Wall and left skew wall, right skew wall formed with filleted corner by abrasive wheel forming grinding finishing and reach below Ra1.6 surface it is thick
Rugosity；With the symmetry of the center line and left skew wall between the left straight wall and right straight wall that are finished by abrasive wheel forming grinding
It is no more than 0.05 between right skew wall with the symmetry error of the center line, practical groove width and the design groove width of the deep trouth
Between error be no more than ± 0.08mm, practical groove depth and design groove depth between error be no more than ± 0.05mm, the inner circle
Error between the real radius and design radial at angle is no more than ± 0.05 °.
The above-mentioned manufacturing method of the present invention ensure that the machining accuracy of deep trouth at least through following several respects：(1) deep trouth is left
The control of right symmetry.Between left straight wall and right straight wall between the symmetry of the center line and left skew wall and right skew wall with
The symmetry requirement of the center line is very high (being no more than ± 0.05mm), and for wheel grinding processing, precision is very high, i.e.,
Make the precision for jig bore and machining center also not low.To solve the symmetrical degree of deep trouth, symmetrical reconditioning requirement is formulated, sternly
Lattice control grinding wheel thickness, wedge angle angle and wedge angle outer arc radius, the symmetrical degree of deep trouth are effectively solved.(2) really
Determine grinding parameter.Determine that grinding parameter is very crucial, it is related to grinding wheel service life, the stability of size, the height of qualification rate.
The rule of grinding wheel cylindrical corner wear when having grasped grinding filleted corner according to experiment applicant, and determining of innovating is a set of ideal
Grinding parameter (revolution of grinding wheel, the depth of cut, the movement speed of grinding wheel, the spray mode of cooling agent), avoids because of grinding parameter
Select it is improper grinding wheel is caused to burst apart, the phenomenon that workpiece is scrapped.(3) the wear control problem of grinding wheel sharp corner bull nose.Grinding wheel
Wedge angle position is easy to wear and spring sword, to control the abrasion of grinding wheel, and discovery must be noted that problems with：Grinding wheel must be ground pair
Claim, it is ensured that during grinding, each face of grinding wheel (containing point) uniform force；Grinding wheel enters slot and to avoid impacting, grinding wheel is caused to burst apart, especially slowly
It is that grinding wheel tip contacts part will more slow down；The special lubricating and cooling agent of simultaneous selection is coordinated, and reduces grinding wheel wedge angle
The abrasion at position.(4) control of groove depth.Because the abrasion of grinding wheel sharp corner is most fast, therefore the control of groove depth is very difficult.The reply of use
Method is：Grinding wheel sharp corner contact workpiece is slower, in addition to strictly control admission velocity, should also strictly control grinding parameter, keep
Sharp, the feed number spraying cooling agent as defined in technological parameter of grinding wheel postpones the abrasion of grinding wheel tip as possible.(5) grinding wheel
Selection.Mainly the hardness of grinding wheel is selected to be combined to reach in cutting ability, wear-resisting property, be trimmed to other machined parameters
The comprehensive benefit of type performance etc..In short, above-mentioned manufacturing method has been implemented in combination with by multiple technologies means to special depth
The high-precision modeling grinding of slot creates the machining accuracy limit of deep trouth in current compact tensile specimen.
The accuracy of manufacture of deep trouth is high in the obtained compact tensile specimen of the present invention and surface quality is preferable, and more preferable guarantee is disconnected
The accuracy of toughness test experiment is split, therefore is suitable for pair in the fields such as nuclear reactor pressure container, aerospace by it
The very high occasion of sample required precision.
Description of the drawings
Fig. 1 is the structure diagram of the compact tensile specimen of the embodiment of the present invention 1.
Fig. 2 is the vertical view of Fig. 1.
Specific embodiment
Embodiment 1
As shown in Figure 1, with the compact tensile specimen of Mr. Yu's nuclear reactor pressure container, the shape of sample ontology 100 is
Cuboid, it is narrow and through table before and after sample ontology 100 that the upper surface 110 of sample ontology 100 is provided with a width straight down
The deep trouth 120 in face, the deep trouth 120 include straight trough portion 121 and the corners 122 positioned at 121 bottom of straight trough portion, and straight trough portion 121 has
There is center line 150 symmetrical left straight wall 121a of the design between the left side 130 of sample ontology 100 and right side 140
With right straight wall 121b, corners 122 has design with the symmetrical left skew wall 122a of the center line 150 and right skew wall
The upper end of 122b, left skew wall 122a and right skew wall 122b are connect respectively with left straight wall 121a and right straight wall 121b lower ends, left
By a filleted corner 122c connection between the lower end of skew wall 122a and the lower end of right skew wall 122b, gone back on sample ontology 100
A pair of circular hole 170 being symmetrically disposed at left and right sides of deep trouth is provided with, there are one dovetails in addition, more than 121 top of straight trough portion also opening
Slot 180；Wherein, the width between left straight wall 121a and right straight wall 121b be groove width L2,121 top of straight trough portion to filleted corner 122c
Bottom end distance is the high H2 of slot, and the distance of filleted corner 122c bottom ends to 100 lower surface 160 of sample ontology is groove depth D, and groove width/slot is high
For the ratio of width to height, main Geometrical Tolerance Principle is as follows on the sample：The design height H1 of sample ontology 100 for 31.75 ±
0.02mm, the design width L1 of sample ontology 100 are 30.48 ± 0.02mm, the design thickness W1 of sample ontology 100 for 12.7 ±
0.02mm, the design groove width L2 of deep trouth 120 is 1.9 ± 0.05mm, and design groove depth D is 14.275 ± 0.03mm, left skew wall 122a
Design angle between right skew wall 122b is 40 ° ± 2 °, and the design radial of filleted corner 122c is R0.05 ± 0.03mm, Zuo Zhi
Between wall 121a and right straight wall 121b between the symmetry of the center line 150 and left skew wall 122a and right skew wall 122b with
The symmetry error of the center line 150 is no more than 0.03；In addition, to the required precision of circular hole 170 and dovetail groove 180 also compared with
It is high.
The manufacturing process flow of said sample is as shown in the table.
| Process | Process title | Use equipment | Allowance (millimeter) | Remarks |
| 1 | Blanking | Sawing machine | 5 | Nothing |
| 2 | Milling shape | Milling machine | 0.8 | Roughing shape |
| 3 | Grind shape | Plain grinding | 0.1 | Roughing shape |
| 4 | Prebored hole | Machining center | 1 | Roughing circular hole |
| 5 | Thick fluting | Wire cutting | 0.3 | Roughing deep trouth and dovetail groove |
| 7 | Refine shape | Precision grinder | Up to figure | Finished profile |
| 8 | Roughly grind slot | Precision grinder | 0.03 | Roughly grind deep trouth (belonging to finishing deep trouth) |
| 9 | Refine slot | Precision grinder | Up to figure | Refine deep trouth (belonging to finishing deep trouth) |
| 10 | Grind dovetail | Precision grinder | Up to figure | Refine dovetail groove |
| 11 | Right boring hole | Machining center | Up to figure | Roughing circular hole |
| 12 | Product inspection | Nothing | ||
| 13 | Purged and packed | Nothing |
Above-mentioned steps 8 to 9 are explained in detail below.
First, deep trouth is roughly ground
A, select the NORTON grinding wheels (model WA80-LV- Φ 200*6* Φ 31.75) of France Sheng Ge spots group and to its into
Row reconditioning, using symmetrical reconditioning mode, the actual (real) thickness of the first grinding wheel is narrower by 0.03 to 0.07mm than design groove width after reconditioning；
The straight trough portion 121 is roughly ground using the first grinding wheel, by the symmetrical center line of the first grinding wheel and the left side 130 during corase grinding
The holding of center line 150 between right side 140 overlaps, and the rotating speed control of the first grinding wheel is 3600 revs/min, the first grinding wheel
Movement speed control for 20 ms/min, when the first grinding wheel often moved back and forth along the front-rear direction of sample ontology 100 it is primary then by the
One grinding wheel is fed down once, and each amount of feeding is 0.02mm, and the first grinding wheel often feeds down a 3 sprays coolant (cooling
Liquid uses WD-40 dehumidifying slushing compounds, similarly hereinafter)；
B, secondary reconditioning, using symmetrical reconditioning mode, the first grinding wheel wedge angle after secondary reconditioning are carried out to the first grinding wheel
The actual angle at place is in the range of design angle angle ± 2 ° between left skew wall 122a and right skew wall 122b, the point of the first grinding wheel
Bull nose real radius is in the range of the design radial ± 0.05mm of the filleted corner 122c at the top of the horn end；It is thick using the first grinding wheel
Grind the corners 122, during corase grinding by the symmetrical center line of the first grinding wheel and the left side 130 and right side 140 it
Between center line 150 keep overlapping, the control of the rotating speed of the first grinding wheel is 3600 revs/min, and the movement speed of the first grinding wheel controls
Be 20 ms/min, when the first grinding wheel often along the front-rear direction of sample ontology 100 move back and forth it is primary then by the first grinding wheel downwards into
To primary, each amount of feeding is 0.02mm, and the first grinding wheel often feeds down coolant of 3 sprays；
2nd, deep trouth is refined
C, NORTON grinding wheels (model WA120-LV- Φ 200*6* Φ 31.75) of France Sheng Ge spots group and and right are selected
It carries out reconditioning, and using symmetrical reconditioning mode, the actual (real) thickness of the second grinding wheel is smaller than the upper limit value for designing groove width after reconditioning
0.01 to 0.025mm；The straight trough portion 121 is refined using the second grinding wheel, by the symmetrical center line of the second grinding wheel during fine grinding
The holding of center line 150 between the left side 130 and right side 140 overlaps, and the control of the rotating speed of the second grinding wheel is 3000 turns/
Minute, the movement speed control of the second grinding wheel is 15 ms/min, when the second grinding wheel is often past along the front-rear direction of sample ontology 100
Multiple movement once then feeds down the second grinding wheel once, and each amount of feeding is 0.002mm, and the second grinding wheel is often fed down 2 times
Spray a coolant；
D, secondary reconditioning, using symmetrical reconditioning mode, the second grinding wheel sharp corner after secondary reconditioning are carried out to the second grinding wheel
Actual angle is in the range of design angle angle ± 2 ° between left skew wall 122a and right skew wall 122b, the wedge angle point of the second grinding wheel
Bull nose real radius is in the range of the design radial ± 0.05mm of the filleted corner 122c at end；Institute is refined using the second grinding wheel
State corners 122, when fine grinding will be between the symmetrical center line of the second grinding wheel and the left side 130 and right side 140
Center line 150 keeps overlapping, and the rotating speed control of the second grinding wheel is 3000 revs/min, and the movement speed control of the second grinding wheel is 15
M/min, when the second grinding wheel is often once then fed down one by the second grinding wheel along the reciprocating motion of the front-rear direction of sample ontology 100
Secondary, each amount of feeding is 0.002mm, and the second grinding wheel often feeds down coolant of 2 sprays.
120 compact tensile specimens are manufactured experimently using the method for embodiment 1, product qualification rate reaches 97%.The qualified examination of trial-production
The far super external similar products of the deep trouth accuracy of manufacture of sample, and deep trouth surface quality is preferable, surface roughness reaches Ra0.4, is more than
Design requirement.
Embodiment 2
The link for roughly grinding deep trouth is reduced to by embodiment 2 on the basis of embodiment 1：Select Sheng Ge spots group of France
NORTON grinding wheels (model WA80-LV- Φ 200*6* Φ 31.75) simultaneously carry out reconditioning to it, using symmetrical reconditioning mode, repair
The actual (real) thickness of the first grinding wheel is narrower by 0.03 to 0.07mm than design groove width after mill, and the actual angle of the first grinding wheel sharp corner is left oblique
In the range of design angle angle ± 2 ° between wall and right skew wall, bull nose real radius is institute at the pointed tips of the first grinding wheel
It states in the range of the design radial ± 0.05mm of filleted corner；Then the straight trough portion 121 and corners are roughly ground using the first grinding wheel
122, by the center line 150 between the symmetrical center line of the first grinding wheel and the left side 130 and right side 140 during corase grinding
It keeping overlapping, the rotating speed control of the first grinding wheel is 3600 revs/min, and the movement speed control of the first grinding wheel is 20 ms/min, when
First grinding wheel often along the front-rear direction of sample ontology 100 reciprocating motion once then the first grinding wheel is fed down once, every time into
It is 0.02mm to amount, the first grinding wheel often feeds down coolant of 3 sprays, and (coolant is using WD-40 dehumidifying anti-rust and lubrications
Agent).As it can be seen that embodiment 2 simplifies the number of the first grinding wheel of reconditioning on the basis of embodiment 1, therefore roughly grind the link work of deep trouth
Make more efficient.120 compact tensile specimens are manufactured experimently using the method for embodiment 2, product qualification rate reaches 95%.
Embodiment 3
For embodiment 3 on the basis of embodiment 2, the d of fine grinding deep trouth link walks repetitive operation altogether three times, uses for the first time
The second grinding wheel model WA120-LV- Φ 200*6* Φ 31.75, the second grinding wheel model WA180-LV- used for the second time
Φ 200*6* Φ 31.75, the second grinding wheel model WA240LV- Φ 200*6* Φ 31.75 used for the third time, i.e., it is above-mentioned three times
The granularity of the second grinding wheel used is successively decreased successively from 120#-180#-240#.It is compact using the method trial-production 120 of embodiment 2
Tensile sample, the real radius that product qualification rate reaches 100%, and more than 90% sample filleted corner 122c reach R0.05
± 0.015mm, groove depth D reach 14.275 ± 0.015mm, preferably ensure that the dimensional accuracy at filleted corner 122c.
Claims (3)
1. for the compact tensile specimen of material properties test, including sample ontology (100), the upper surface of sample ontology (100)
(110) be provided with straight down a width it is narrow and through sample ontology (100) front and rear surfaces deep trouth (120), the deep trouth
(120) corners (122) including straight trough portion (121) and positioned at straight trough portion (121) bottom, straight trough portion (121) have design with
The symmetrical left straight wall of center line (150) between the left side (130) of sample ontology (100) and right side (140)
(121a) and right straight wall (121b), corners (122) have design with the symmetrical left skew wall of the center line (150)
The upper end of (122a) and right skew wall (122b), left skew wall (122a) and right skew wall (122b) respectively with left straight wall (121a) and
Right straight wall (121b) lower end connection, passes through a filleted corner between the lower end of left skew wall (122a) and the lower end of right skew wall (122b)
(122c) is connected；Width between left straight wall (121a) and right straight wall (121b) is groove width, straight trough portion (121) top to filleted corner
(122c) bottom end distance is high for slot, and the distance of filleted corner (122c) bottom end to sample ontology (100) lower surface (160) is groove depth,
The a height of the ratio of width to height of groove width/slot, it is characterised in that：The design groove width of the deep trouth (120) is 0.8 to 5mm, and design the ratio of width to height is 0.02
To 0.2, design groove depth is 10 to 35mm, and the design angle between left skew wall (122a) and right skew wall (122b) is 30 to 70 °,
The design radial of filleted corner (122c) is 0.02 to 0.6mm；Left straight wall (121a) and right straight wall (121b) and left skew wall (122a),
Right skew wall (122b) and filleted corner (122c) formed by abrasive wheel forming grinding finishing and reach below Ra1.6 surface it is thick
Rugosity；With the center line (150) between the left straight wall (121a) and right straight wall (121b) that are finished by abrasive wheel forming grinding
Symmetry and left skew wall (122a) and right skew wall (122b) between do not surpassed with the symmetry error of the center line (150)
0.05 is crossed, the error between the practical groove width of the deep trouth (120) and design groove width is no more than ± 0.08mm, and practical groove depth is with setting
The error counted between groove depth is no more than ± 0.05mm, the error between the real radius and design radial of the filleted corner (122c)
No more than ± 0.05mm.
2. it to be used for the compact tensile specimen of material properties test as described in claim 1, it is characterised in that：Left straight wall (121a)
Between right straight wall (121b) between the symmetry of the center line (150) and left skew wall (122a) and right skew wall (122b)
It is no more than 0.03, between the practical groove width of deep trouth (120) and design groove width with the symmetry error of the center line (150)
Error is no more than ± 0.05mm, and the error between practical groove depth and design groove depth is no more than ± 0.03mm, filleted corner (122c)
Error between real radius and design radial is no more than ± 0.03mm.
3. it to be used for the compact tensile specimen of material properties test as described in claim 1, it is characterised in that：The sample ontology
(100) shape is cuboid.
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| CN106644681B (en) * | 2016-10-08 | 2018-11-09 | 中广核工程有限公司 | The sample component and method of nuclear power plant reactor pressure vessel irradiation experiment |
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