CN106908341A - A kind of method for making sample of steel ball sample and the rockwell hardness testing method of steel ball - Google Patents
A kind of method for making sample of steel ball sample and the rockwell hardness testing method of steel ball Download PDFInfo
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- CN106908341A CN106908341A CN201710192129.0A CN201710192129A CN106908341A CN 106908341 A CN106908341 A CN 106908341A CN 201710192129 A CN201710192129 A CN 201710192129A CN 106908341 A CN106908341 A CN 106908341A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/40—Investigating hardness or rebound hardness
- G01N3/42—Investigating hardness or rebound hardness by performing impressions under a steady load by indentors, e.g. sphere, pyramid
- G01N3/44—Investigating hardness or rebound hardness by performing impressions under a steady load by indentors, e.g. sphere, pyramid the indentors being put under a minor load and a subsequent major load, i.e. Rockwell system
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- 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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0076—Hardness, compressibility or resistance to crushing
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Abstract
A kind of method for making sample of steel ball sample and the rockwell hardness testing method of steel ball, are related to hardness test field.A kind of method for making sample of steel ball sample, face is ground and the step of the second steel ball for grinding face is polished to being machined with relative first；The step of polishing steel ball, includes：Grind after face is repeatedly ground formation experiment face to first, first grinds during face repeatedly ground, after once grind the first wear particle size for grinding face and once grind the first wear particle size for grinding face less than preceding；And grind face to second and grind forming supporting surface.It can grind surface smooth, smooth, meet rockwell hardness testing requirement, and the roughness in experiment face is smaller, relatively accurately can carry out rockwell hardness testing to steel ball sample.A kind of rockwell hardness testing method of steel ball, including：Rockwell hardness testing is carried out to the steel ball sample that the method for making sample of above-mentioned steel ball sample is obtained.Its test result is accurate.
Description
Technical field
The present invention relates to hardness test field, and more particularly to a kind of steel ball sample method for making sample and the Rockwell of steel ball
Hardness measuring method.
Background technology
Steel ball is a kind of important base parts and components, and it is widely used in the fields such as electric power, building materials, mine, metallurgy, especially
It is very extensive in accurate commercial Application.Steel ball is the most important part of bearing, is also that bearing industry uses most rollings
Body, the quality of steel ball directly affects bearing quality.Under some specific conditions, it is often necessary to which the steel ball of special substance is completed
The required function of reaching under varying environment.Therefore, the quality of the quality of steel ball is just particularly important.Steel ball quality is sentenced
It is fixed generally to need to determine its hardness, when the hardness to steel ball is tested, by the spherical form by steel ball is limited, generally require
Steel ball sample is produced by the way of wire cutting, but through the steel ball sample after linear cutter, surface would generally be concavo-convex afterwards
Uneven cutter trade, specimen surface also has grease, does not reach the requirement of hardness test.
The content of the invention
It is an object of the invention to provide a kind of method for making sample of steel ball sample, its can by first grind face grind it is flat
It is whole, smooth, meet hardness test requirement, and the roughness in experiment face is smaller, relatively accurately can carry out Rockwell to steel ball sample
Hardness test.
A kind of rockwell hardness testing method another object of the present invention is to provide steel ball, including to above-mentioned steel ball sample
The steel ball sample that obtains of method for making sample carry out rockwell hardness testing, its test result is accurate.
The present invention is solved its technical problem and is realized using following technical scheme.
The present invention proposes a kind of method for making sample of steel ball sample, and grinding face and second to being machined with relative first grinds face
Steel ball the step of polished；The step of polishing steel ball, includes：Face and second is ground to first to grind face and grind respectively；
Grind after face is repeatedly ground formation experiment face to first, first grinds during face repeatedly ground, after once grind first
The wear particle size for grinding face once grinds the first wear particle size for grinding face less than preceding；And face is ground to second carry out grinding shape
Into supporting surface.
The present invention also proposes a kind of rockwell hardness testing method of steel ball, including：To the method for making sample of above-mentioned steel ball sample
The steel ball sample for obtaining carries out rockwell hardness testing.
The beneficial effect of the embodiment of the present invention is：A kind of method for making sample of steel ball sample, is carried out by grinding face to first
Repeatedly grind, and after the wear particle size that once grinds be larger grain less than the preceding wear particle size for once grinding, when grinding for the first time
The abrasive particle of degree, can grind first rough ripple glaze on face and grind off, and grind must be very fast；But because the grain of abrasive particle
Degree it is larger, therefore first grind face roughness it is also larger.Then by grinding for the second time, the abrasive particle grain for grinding for the second time
Less than the wear particle size for grinding for the first time, after grinding for the second time, the polishing scratch left when first time can be ground grinds off degree, the
One roughness for grinding face can grind smaller, and first grinds face also can be more smooth.Then carry out third time, the 4th time and more
Multiple grinds because after the wear particle size that once grinds less than the preceding wear particle size for once grinding, after repeatedly grinding, the
One grinds face can be more and more smooth, more and more smooth.Second grinds the corresponding face of supporting surface that face is steel ball, only needs to protect when grinding
The certain flatness of card.
A kind of rockwell hardness testing method of steel ball, because of the steel ball sample examination obtained with the method for making sample of above-mentioned steel ball sample
Test that face is smooth, smooth, meet the standard of rockwell hardness testing, thus the result of hardness test is accurate, accurate.
Specific embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below will be in the embodiment of the present invention
Technical scheme be clearly and completely described.Unreceipted actual conditions person, builds according to normal condition or manufacturer in embodiment
The condition of view is carried out.Agents useful for same or the unreceipted production firm person of instrument, are the conventional product that can be obtained by commercially available purchase
Product.
Below to the method for making sample and the rockwell hardness testing method of steel ball of a kind of steel ball sample of the embodiment of the present invention
It is specifically described.
A kind of method for making sample of steel ball sample, grinding face and the second steel ball for grinding face to being machined with relative first is carried out
The step of polishing；The step of polishing steel ball, includes：Face and second is ground to first to grind face and grind respectively；Ground to first
Face forms experiment face after repeatedly being ground, first grinds during face repeatedly ground, after once grind the first mill for grinding face
Grain granularity once grinds the first wear particle size for grinding face less than preceding；And grind face to second and grind forming supporting surface.
Hardness test is to weigh the good and bad important symbol of workpiece quality, and rockwell hardness testing is realized by hardometer,
If the back of the body surveys workpiece has problem in itself, error can be then produced in test, this can cause certain influence to production.Using wire cutting
Mode steel ball is cut, the steel ball after processing grinds face and second and grinds face including relative first.Carrying out Rockwell
During hardness test, roughness and flatness to testing face are to have certain requirements.Experiment face rough surface, can cause test high
Hardness (quenching part) value is higher, and soft (quenched part) value is relatively low.Experiment face surface irregularity, hardness test value can height change
Change, the test result that each test position is obtained can differ larger.
Carry out repeatedly grinding to form experiment face by grinding face to first, and after the wear particle size that once grinds less than previous
The secondary wear particle size for grinding, is the abrasive particle of larger granularity when grinding for the first time, can grind rough wave on face by first
Line grinds off, and grind must be very fast；But because the granularity of abrasive particle is larger, therefore first grinds the roughness in face also larger
A bit.Then by grinding for the second time, the wear particle size that the wear particle size for grinding for the second time grinds less than first time, by second
After grinding, the polishing scratch left when can be ground first grinds off, and the first roughness for grinding face can grind smaller, and first grinds face
Also can be more smooth.Then carry out third time, the 4th time and more frequently grind because after the wear particle size that once grinds be less than
The preceding wear particle size for once grinding, after repeatedly grinding, first grinds face can be more and more smooth, more and more smooth.In this hair
In bright embodiment, grind and ground by sand belt sample milling machine realization, such efficiency can be some higher, the abrasive band in embodiment
Granularity is above-mentioned wear particle size.In other embodiments, other also may be selected and grinds mode, for example, carried out manually using sand paper
Grind, manually grinding efficiency can be lower.
Preferably, when grinding face to first and repeatedly grind, repeatedly grind including：Corase grind, fine grinding and fine grinding, the abrasive particle of corase grind
, more than the wear particle size of fine grinding, the wear particle size of fine grinding is more than the wear particle size for refining for granularity.The wear particle size of corase grind is 30-80
Mesh, the wear particle size of fine grinding is 200-280 mesh, and the wear particle size of fine grinding is 750-850 mesh.It is further preferred that the mill of corase grind
Grain granularity is 50 mesh, and the wear particle size of fine grinding is 220 mesh, and the wear particle size of fine grinding is 800 mesh.The scope is that inventor combines certainly
The preferred value that body experience is obtained with creative work, repeatedly grinds the mode that selection is roughly ground, fine grinding and fine grinding are combined, and slightly
The wear particle size of mill, fine grinding and fine grinding selects above-mentioned scope, and it is more smooth, smooth that first for finally obtaining grinds face.
Further, when being roughly ground, grind when face is completely exposed metallic luster and stop until first；When carrying out fine grinding, directly
Stop when grinding face flat-satin to first；When being refined, untill first grinds face without polishing scratch.Grinding face to first is carried out
After corase grind, fine grinding, fine grinding, under above-mentioned standard, the first roughness for grinding face is finally less than 1.6.
Further, ground to first after face repeatedly grinds, first to grind face be the face where the steel ball centre of sphere.First grinds
Face is the face where the steel ball centre of sphere, when carrying out rockwell hardness testing to steel ball, selects the centre of sphere of steel ball as one of test
Point, can preferably react the performance of steel ball.
Further, in the sample making course of steel ball sample, also to grind face to second and grind, the wear particle size for grinding
It is 30-80 mesh.Second to grind after face grinds be the supporting surface of steel ball, only need to ensure certain flatness, therefore select grain
Spend for the abrasive particle of 30-80 mesh is ground, the speed for so grinding can be fast, it is preferable that grinds face to second and grinds
When, the granularity of abrasive particle is 30-80 mesh.
Further, face and second is ground to first to grind after face grinds, and then steel ball is cleaned.Cleaning steel
The step of ball, includes：Steel ball is cleaned with kerosene, hot water, alcohol successively, soak time of the steel ball in kerosene is in 3min
And more than, the temperature of hot water at 30 DEG C and more than.
Steel ball is put into kerosene soak 3min and more than, immersion can be by foreign substance cleanings such as the greases on steel ball in kerosene
Totally, then with temperature in 30 DEG C and hot water injection's sample of the above, it is capable of washing fall steel ball on the kerosene left, then wait steel ball
It is dried, uses alcohol washes steel ball.After being cleaned to steel ball in a manner described, finally meet the mark of rockwell hardness testing
It is accurate.
A kind of method of testing of the Rockwell hardness of steel ball, including the steel ball examination obtained to the method for making sample of above-mentioned steel ball sample
Sample carries out hardness test, because the steel ball specimen surface obtained with the method for making sample of above-mentioned steel ball sample is smooth, smooth, meets Rockwell
The standard of hardness test, thus the result of hardness test is more accurate, accurate.
Feature of the invention and performance are described in further detail with reference to embodiments.
Embodiment 1
A kind of method for making sample of steel ball sample, is cut using the mode of wire cutting to steel ball, the steel ball bag after processing
Include relative first and grind face and second and grind face.Face is ground using sand belt sample milling machine to first repeatedly to be ground, after grinding
The experiment face of steel ball is formed, grind mode is carried out successively according to corase grind, fine grinding, fine grinding.The abrasive band granularity of corase grind is 50 mesh, is ground
To when being completely exposed metallic luster；The abrasive band granularity of fine grinding is 220 mesh, is stopped when first grinds face flat-satin；Essence
The mesh of abrasive band granularity 800 of mill, grind face flat-satin until first, without polishing scratch untill.After the completion of grinding, first grinds face for steel
Face where the ball centre of sphere.Face is ground using sand belt sample milling machine to second to grind, abrasive band granularity is 50 mesh, and steel is formed after grinding
The supporting surface of ball.After the completion of grinding, steel ball is put into kerosene and soaks 3min, the foreign substance cleanings such as the grease on steel ball is clean；
Then with 30 DEG C of hot water injection's steel ball, the kerosene on steel ball is washed, after waiting steel ball to dry, uses alcohol washes steel ball.
A kind of rockwell hardness testing method of steel ball, including the steel ball sample obtained to the method for making sample of above-mentioned steel ball sample
Carry out rockwell hardness testing.
Embodiment 2
A kind of method for making sample of steel ball sample, the mode using wire cutting includes to the steel ball that steel ball is carried out after cutting processing
Relative first grinds face and second and grinds face.Face is ground to first repeatedly to be ground, grind rear shape using sand belt sample milling machine
Into the experiment face of steel ball, grind mode is carried out successively according to corase grind, fine grinding, fine grinding.The abrasive band granularity of corase grind is 40 mesh, is ground
Untill when being completely exposed metallic luster；The abrasive band granularity of fine grinding is 230 mesh, is stopped when first grinds face flat-satin；Fine grinding
The mesh of abrasive band granularity 780, grind face flat-satin until first, without polishing scratch untill.After the completion of grinding, first grinds face for steel ball
Face where the centre of sphere.Face is ground using sand belt sample milling machine to second to grind, abrasive band granularity is 30 mesh, and steel ball is formed after grinding
Supporting surface.After the completion of grinding, steel ball is put into kerosene and soaks 5min, the foreign substance cleanings such as the grease on steel ball is clean；So
Afterwards with 50 DEG C of hot water injection's steel ball, the kerosene on steel ball is washed, after waiting steel ball to dry, use alcohol washes steel ball.
A kind of rockwell hardness testing method of steel ball, including the steel ball sample obtained to the method for making sample of above-mentioned steel ball sample
Carry out rockwell hardness testing.
Embodiment 3
A kind of method for making sample of steel ball sample, is cut using the mode of wire cutting to steel ball, the steel ball bag after processing
Include relative first and grind face and second and grind face.Face is ground using sand belt sample milling machine to first repeatedly to be ground, after grinding
The experiment face of steel ball is formed, grind mode is carried out successively according to corase grind, fine grinding, fine grinding.The abrasive band granularity of corase grind is 60 mesh, is ground
To when being completely exposed metallic luster；The abrasive band granularity of fine grinding is 200 mesh, is stopped when first grinds face flat-satin；Essence
The mesh of abrasive band granularity 820 of mill, grind face flat-satin until first, without polishing scratch untill.After the completion of grinding, first grinds face for steel
Face where the ball centre of sphere.Face is ground using sand belt sample milling machine to second to grind, abrasive band granularity is 60 mesh, and steel is formed after grinding
The supporting surface of ball.After the completion of grinding, steel ball is put into kerosene and soaks 8min, the foreign substance cleanings such as the grease on steel ball is clean；
Then with 50 DEG C of hot water injection's steel ball, the kerosene on steel ball is washed, after waiting steel ball to dry, uses alcohol washes steel ball.
A kind of rockwell hardness testing method of steel ball, including the steel ball sample obtained to the method for making sample of above-mentioned steel ball sample
Carry out rockwell hardness testing.
Embodiment 4
A kind of method for making sample of steel ball sample, is cut using the mode of wire cutting to steel ball, the steel ball bag after processing
Include relative first and grind face and second and grind face.Face is ground using sand belt sample milling machine to first repeatedly to be ground, after grinding
The experiment face of steel ball is formed, grind mode is carried out successively according to corase grind, fine grinding, fine grinding.The abrasive band granularity of corase grind is 40 mesh, is ground
To when being completely exposed metallic luster；The abrasive band granularity of fine grinding is 200 mesh, is stopped when first grinds face flat-satin；Essence
The mesh of abrasive band granularity 800 of mill, grind face flat-satin until first, without polishing scratch untill.After the completion of grinding, first grinds face for steel
Face where the ball centre of sphere.Face is ground using sand belt sample milling machine to second to grind, abrasive band granularity is 80 mesh, and steel is formed after grinding
The supporting surface of ball.After the completion of grinding, steel ball is put into kerosene and soaks 10min, the foreign substance cleanings such as the grease on steel ball is clean；
Then with 60 DEG C of hot water injection's steel ball, the kerosene on steel ball is washed, after waiting steel ball to dry, uses alcohol washes steel ball.
A kind of rockwell hardness testing method of steel ball, including the steel ball sample obtained to the method for making sample of above-mentioned steel ball sample
Carry out rockwell hardness testing.
Comparative example
A kind of method for making sample of steel ball sample, is cut using the mode of wire cutting to steel ball, the steel ball bag after processing
Include relative first and grind face and second and grind face, face and second is ground to first with the sand paper that granularity is 150 mesh grinds face and enter
Row grinds, and after the completion of grinding, first grinds face of the face where the steel ball centre of sphere.After grinding first grinds the experiment that face is steel ball
Face, after grinding second grinds the supporting surface that face is steel ball.After grinding grease is removed with alcohol.
Test example
Rockwell hardness testing is carried out to the steel ball sample that the method for making sample of embodiment 1 and the steel ball sample of comparative example is obtained.
The rockwell hardness testing of steel ball is with reference to GB/T230.1-2004 (metal rockwell hardness testing).5 points of each steel ball Specimen Determination,
It is respectively the centre of sphere, 1/4R, 1/2R, 3/4R and edge, test result is as shown in table 1.
The rockwell hardness testing result of the steel ball sample of the embodiment 1 of table 1 and comparative example
As shown in table 1, the test result according to table 1 can be seen that the steel ball sample of embodiment 1 each position measurement and obtain
Hardness number be all more or less the same, only difference 0.5 between its maximum and minimum value, the hardness number of each position difference it is minimum only
Have 0.1, and the average value of the hardness number also with hardness of each position is little.And each position of the steel ball sample of comparative example
Hardness number difference is larger, and 2.8 are differed between its maximum and minimum value, and the hardness number difference of each position is minimum also to be reached
Also differ larger between 0.4, and the hardness number and hardness average value of each position.Illustrate by the steel ball of the embodiment of the present invention
The steel ball sample that the method for making sample of sample is obtained, hardness test is carried out to it, and the result of test is more accurate, accurate.
In sum, the method for making sample and the hardness measuring method of steel ball of a kind of steel ball sample of the embodiment of the present invention,
Repeatedly ground by grinding face to first, and after the wear particle size that once grinds less than the preceding wear particle size for once grinding,
It is for the first time the abrasive particle of larger granularity when grinding, rough ripple glaze on face can be ground by first and ground off, and grind must
Comparatively fast；But because the granularity of abrasive particle is larger, thus first grind face roughness it is also larger.Then ground by second
System, the wear particle size for grinding for the second time after grinding for the second time, can grind less than the wear particle size for grinding for the first time first
When the polishing scratch that leaves grind off, the first roughness for grinding face can grind smaller, and first grinds face also can be more smooth.Then carry out
For the third time, the 4th time and more frequently grind because after the wear particle size that once grinds less than the preceding abrasive particle grain for once grinding
Degree, after repeatedly grinding, first grinds face can be more and more smooth, more and more smooth.Second grinds the supporting surface that face is steel ball
Corresponding face, need to only ensure certain flatness when grinding.The rockwell hardness testing method of steel ball, because being tried with above-mentioned steel ball
The steel ball specimen test face that the method for making sample of sample is obtained is smooth, smooth, meets the standard of rockwell hardness testing, thus hardness test
Result it is accurate, accurate.
Embodiments described above is a part of embodiment of the invention, rather than whole embodiments.Reality of the invention
The detailed description for applying example is not intended to limit the scope of claimed invention, but is merely representative of selected implementation of the invention
Example.Based on the embodiment in the present invention, what those of ordinary skill in the art were obtained under the premise of creative work is not made
Every other embodiment, belongs to the scope of protection of the invention.
Claims (10)
1. a kind of method for making sample of steel ball sample, it is characterised in that including grinding face and the second mill to being machined with relative first
The step of steel ball in face processed is polished；
Polish the steel ball the step of include：Formation experiment face, described first after face is repeatedly ground are ground to described first
Grind during face repeatedly ground, after once grind the described first wear particle size for grinding face and once grind described first less than preceding
Grind the wear particle size in face；And grind face to described second and grind forming supporting surface.
2. the method for making sample of steel ball sample according to claim 1, it is characterised in that grind face to described first and repeatedly grind
When processed, it is described repeatedly grind including：Corase grind, fine grinding and fine grinding, the abrasive particle grain of the wear particle size more than the fine grinding of the corase grind
Degree, the wear particle size of the wear particle size more than the fine grinding of the fine grinding.
3. the method for making sample of steel ball sample according to claim 2, it is characterised in that the wear particle size of the corase grind is
30-80 mesh, the wear particle size of the fine grinding is 200-280 mesh, and the wear particle size of the fine grinding is 750-850 mesh.
4. the method for making sample of steel ball sample according to claim 3, it is characterised in that the wear particle size of the corase grind is 50
Mesh, the wear particle size of the fine grinding is 220 mesh, and the wear particle size of the fine grinding is 800 mesh.
5. the method for making sample of steel ball sample according to claim 2, it is characterised in that when carrying out the corase grind, Zhi Daosuo
State first and grind when face is completely exposed metallic luster and stop；When carrying out the fine grinding, when described first grinds face flat-satin
Only；When carrying out the fine grinding, untill described first grinds face without polishing scratch.
6. the method for making sample of the steel ball sample according to claim any one of 1-5, it is characterised in that ground to described first
After face repeatedly grinds, described first grinds face of the face where the centre of sphere of steel ball.
7. the method for making sample of steel ball sample according to claim 1, it is characterised in that grind face to described second and grind
When processed, the granularity of abrasive particle is 30-80 mesh.
8. the method for making sample of steel ball sample according to claim 7, it is characterised in that grind face to described second and grind
When processed, the granularity of abrasive particle is 30-80 mesh.
9. the method for making sample of steel ball sample according to claim 1, it is characterised in that also including the steel after to grinding
The step of the step of ball is cleaned, cleaning steel ball, includes：The steel ball is cleaned with kerosene, hot water, alcohol successively, institute
State soak time of the steel ball in the kerosene 3min and more than, the temperature of the hot water at 30 DEG C and more than.
10. a kind of rockwell hardness testing method of steel ball, it is characterised in that including：To the steel described in claim any one of 1-9
The steel ball sample that the method for making sample of ball sample is obtained carries out rockwell hardness testing.
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| CN107247005A (en) * | 2017-08-02 | 2017-10-13 | 安吉元融仪器仪表检测有限公司 | A kind of method for calibrating Rockwell apparatus |
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Application publication date: 20170630 |