CN109507055A - A method of measurement fastener hardness distribution - Google Patents
A method of measurement fastener hardness distribution Download PDFInfo
- Publication number
- CN109507055A CN109507055A CN201910031359.8A CN201910031359A CN109507055A CN 109507055 A CN109507055 A CN 109507055A CN 201910031359 A CN201910031359 A CN 201910031359A CN 109507055 A CN109507055 A CN 109507055A
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- hardness
- measurement
- depth
- blade
- scratch
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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
Abstract
The present invention provides a kind of method of measurement fastener hardness distribution, include the following steps: to be crossed on sample with method of scoring by blade；Three hardness points are equidistantly successively measured in scribing line starting end, as standard hardness, respectively correspond the depth of scratch corresponding site, it the use of the data that method of scoring obtains is scratch depth h, known data have blade wedge angle η, constant pressure F, obtain the functional relation of micro-vickers hardness and depth of cup: being controlled by director demon, above-mentioned relation and the depth curve of scratch is corresponding, it can be obtained the hardness profile in region to be measured.The method of measurement fastener hardness distribution of the present invention, by claiming region to be measured to cross, by hardness-scratch depth functional relation, direct measuring goes out the hardness distribution situation in surveyed region, and measurement data accuracy is high.
Description
Technical field
The invention belongs to hardness measurement fields, more particularly, to a kind of method of measurement fastener hardness distribution.
Background technique
Hardness is the soft or hard index of material, while there are certain connection with the mechanical property of material (such as: pulling force, shearing)
System.Because its measurement method is more simple, quick relative to the mensuration of pulling force, shearing etc., fastener is in production process
In commonly using hardness judge whether product has reached expected mechanical property requirements.Hardness test generally is single-point survey
Amount calculates hardness number according to the size of impression.And currently, certain new products propose newly the performance of product in fastener
Requirement, cannot simply test the hardness of its pulling force, shearing, single-point (or in region).Such as certain class pumping nail, for product
It is required that be that, the hardness in the region that when riveting deforms is lower than the hardness in undeformed area, and hardness number is required to become in continuous
Change, there can be no the firmness changes of cliff of displacement formula.This is a challenge to existing detection method.
The method for measuring the hardness distribution of such fastener at present, the mainly method by carrying out multimetering, one
In section region, a hardness point is measured every a distance, general measure at least 30 hardness points can draw hardness point
Cloth curve.This method is primarily present following drawback: 1, time of measuring is long, usually tests a hardness point and needs 2min left
Right (including the processes such as reconnaissance, focusing, guarantor's load, measurement, record), therefore the hardness distribution situation for measuring an exemplar at least needs
1 hour.For production, undoubtedly the bottleneck process of production process, becomes the biggest problem of mass production, detection.
2, data inaccuracy, for short part, many products are unable to measure 30 hardness points, therefore in measurement, all can be as far as possible
Shorten the distance between two hardness points, often will appear the case where interfering with each other between two impressions, causes the data of measurement
Inaccurate phenomenon, and this problem is unavoidable using current technology.3, curve unsightly, and can not be read non-
Measurement point is with the hardness number of exterior domain.It is line chart by the hardness profile that the method for multimetering obtains, it is very not beautiful
It sees.It is practical to anticipate even if making its gentle transition, but the curve obtained can not also read the hardness number other than measurement point by fitting
It is adopted little.
Summary of the invention
In view of this, the present invention is directed to propose it is a kind of measurement fastener hardness distribution method, to solve existing measurement side
Method time of measuring is long, measurement data is inaccurate, the inaesthetic problem of hardness profile.
In order to achieve the above objectives, the technical scheme of the present invention is realized as follows:
A method of measurement fastener hardness distribution includes the following steps:
Step 1: it is crossed on sample with method of scoring by blade；
Step 2: three hardness points successively equidistantly are measured as standard hardness in scribing line starting end and respectively correspond scratch phase
The depth for answering position illustrates measuring method of the invention by taking Vickers hardness as an example, it is known that hardness number is related to the diameter of impression,
The hardness number of Vickers hardness and the hardness relation of impression size are as follows:
In formula: S=indentation surface product；
F=load；
α=pressure head opposite face angle；
D is averaged impression catercorner length；
Using method of scoring obtain data be scratch depth h, it is known that data there is blade wedge angle η, constant pressure F to be shown
The functional relation of micro- Vickers hardness and depth of cup:
In formula: F=load；
α=standard hardness measurement pressure head opposite face angle；
λ is the function of region material to be measured Yu blade wedge angle η；
H is scratch depth, is the variable in this formula；
K is correction factor；
Step 3: being controlled by director demon, and above-mentioned relation and the depth curve of scratch is corresponding, can be obtained
Obtain the hardness profile in region to be measured.
Further, the concrete operations of the method for scoring are as follows: cut the sample of required measurement by wire cutting, cruelly
Reveal region to be measured, inlay sample and polished by sand paper polishing, diamond paste, completes sample preparation；Sample is fixed on survey
It tries on platform, it is ensured that will not be moved in scribing line, while guarantee that region to be measured is consistent with the direction of scribing line.
Further, the controller is PLC or computer.
Further, the blade is mounted below hardness test instrument.
Further, the pressing-in force of blade and the pressing-in force of standard hardness are consistent, or at multiple proportion.
Further, the guarantor after blade indentation test carries the time not less than 10s.
Further, 0.5~5mm/min of blade forward speed range；
Further, the standard hardness point is corresponding with the depth areas of scratch.
Further, the measuring method can replace Vickers hardness with Rockwell hardness or Brinell hardness.
Compared with the existing technology, the method for measurement fastener hardness distribution of the present invention has the advantage that
(1) method of measurement fastener hardness distribution of the present invention, by claiming region to be measured to cross, by hard
Degree-scratch depth functional relation, direct measuring go out the hardness distribution situation in surveyed region, and measurement data accuracy is high.
(2) method of measurement fastener hardness distribution of the present invention, method is simple, and time of measuring is short, greatly improves
Working efficiency.
Detailed description of the invention
The attached drawing for constituting a part of the invention is used to provide further understanding of the present invention, schematic reality of the invention
It applies example and its explanation is used to explain the present invention, do not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is the structural schematic diagram one of blade described in the embodiment of the present invention；
Fig. 2 is the structural schematic diagram two of blade described in the embodiment of the present invention.
Specific embodiment
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", "upper", "lower",
The orientation or positional relationship of the instructions such as "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside" is
It is based on the orientation or positional relationship shown in the drawings, is merely for convenience of description of the present invention and simplification of the description, rather than instruction or dark
Show that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as pair
Limitation of the invention.In addition, term " first ", " second " etc. are used for description purposes only, it is not understood to indicate or imply phase
To importance or implicitly indicate the quantity of indicated technical characteristic.The feature for defining " first ", " second " etc. as a result, can
To explicitly or implicitly include one or more of the features.In the description of the present invention, unless otherwise indicated, " multiple "
It is meant that two or more.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood by concrete condition
Concrete meaning in the present invention.
The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
A method of measurement fastener hardness distribution as depicted in figs. 1 and 2, comprises the following steps that
It is crossed on sample with method of scoring by blade；
Since the hardness of position each in region is different, it is also different that blade streaks left scratch depth, therefore
The hardness distribution situation in region can be determined according to the depth of sample.
Three hardness points successively equidistantly, which are measured, as standard hardness in scribing line starting end respectively corresponds scratch corresponding site
Depth illustrate measuring method of the invention by taking Vickers hardness as an example, it is known that hardness number is related to the diameter of impression, and Vickers is hard
The hardness number of degree and the hardness relation of impression size are as follows:
In formula: S=indentation surface product；
F=load；
α=pressure head opposite face angle；
D is averaged impression catercorner length.
Using method of scoring obtain data be scratch depth h, it is known that data there is blade wedge angle η, constant pressure F to be shown
The functional relation of micro- Vickers hardness and depth of cup:
In formula: F=load；
α=standard hardness measurement pressure head opposite face angle；
λ is the function of region material to be measured Yu blade wedge angle η；
H is scratch depth, is the variable in this formula；
K is correction factor.
It is controlled by director demon, above-mentioned relation and the depth curve of scratch is corresponding, it can be obtained to be measured
The hardness profile in region.
Such as with other kinds of hardness (such as Rockwell hardness, Brinell hardness), method is identical as above-mentioned corresponding relationship, tool
Body formula repeats no more.
The concrete operation step of the method for scoring are as follows:
The sample of required measurement is cut by wire cutting, exposure region to be measured inlays sample and passes through sand paper
Polishing, diamond paste polishing, complete sample preparation；
Sample is fixed on test platform, it is ensured that will not be moved in scribing line, while guarantee region to be measured and drawing
The direction of line is consistent.
The controller is PLC or computer.
The blade is mounted below hardness test instrument.
The pressing-in force of blade and the pressing-in force of standard hardness are consistent, or at multiple proportion；
Guarantor after blade indentation test carries the time: 10s or longer；
Blade forward speed: more slower better, it is proposed that 0.5~5mm/min；
The selection of standard hardness point: can randomly select, but requirement is corresponding with the corresponding region of scratch, is convenient for measuring and compares
Compared with；
If the material that measures every time is different, need before the test, by test to the value of correction factor k and λ into
Row determines, to ensure the accuracy of measurement result.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of method of measurement fastener hardness distribution, characterized by the following steps:
Step 1: it is crossed on sample with method of scoring by blade；
Step 2: three hardness points successively equidistantly are measured as standard hardness in scribing line starting end and respectively correspond the corresponding portion of scratch
The depth of position illustrates measuring method of the invention by taking Vickers hardness as an example, it is known that hardness number is related to the diameter of impression, Vickers
The hardness number of hardness and the hardness relation of impression size are as follows:
In formula: S=indentation surface product；
F=load；
α=pressure head opposite face angle；
D is averaged impression catercorner length；
The use of the data that method of scoring obtains is scratch depth h, it is known that data have blade wedge angle η, a constant pressure F, obtain dimensional microstructure
The functional relation of family name's hardness and depth of cup:
In formula: F=load；
α=standard hardness measurement pressure head opposite face angle；
λ is the function of region material to be measured Yu blade wedge angle η；
H is scratch depth, is the variable in this formula；
K is correction factor；
Step 3: being controlled by director demon, and above-mentioned relation and the depth curve of scratch is corresponding, can be obtained to
Survey the hardness profile in region.
2. a kind of method of measurement fastener hardness distribution according to claim 1, it is characterised in that: the method for scoring
Concrete operations are as follows:
The sample of required measurement is cut by wire cutting, exposure region to be measured, inlay sample and polished by sand paper,
Diamond paste polishing, completes sample preparation；
Sample is fixed on test platform, it is ensured that will not be moved in scribing line, while guarantee region to be measured and scribing line
Direction is consistent.
3. a kind of method of measurement fastener hardness distribution according to claim 1, it is characterised in that: the controller is
PLC or computer.
4. a kind of method of measurement fastener hardness distribution according to claim 1, it is characterised in that: the blade installation
Below hardness test instrument.
5. a kind of method of measurement fastener hardness distribution according to claim 1, it is characterised in that: the pressing-in force of blade
It is consistent with the pressing-in force of standard hardness, or at multiple proportion.
6. a kind of method of measurement fastener hardness distribution according to claim 1, it is characterised in that: blade indentation test
Guarantor afterwards carries the time not less than 10s.
7. a kind of method of measurement fastener hardness distribution according to claim 1, it is characterised in that: blade forward speed
0.5~5mm/min of range.
8. a kind of method of measurement fastener hardness distribution according to claim 1, it is characterised in that: the standard hardness
Point is corresponding with the depth areas of scratch.
9. a kind of method of measurement fastener hardness distribution according to claim 1, it is characterised in that: the measuring method
Vickers hardness can be replaced with Rockwell hardness or Brinell hardness.
Priority Applications (1)
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| CN201910031359.8A CN109507055B (en) | 2019-01-14 | 2019-01-14 | Method for measuring hardness distribution of fastener |
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| CN201910031359.8A CN109507055B (en) | 2019-01-14 | 2019-01-14 | Method for measuring hardness distribution of fastener |
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| CN109507055B CN109507055B (en) | 2021-05-28 |
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Cited By (3)
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| CN110231238A (en) * | 2019-05-30 | 2019-09-13 | 吉林省维尔特隧道装备有限公司 | The gradient rigidity detection device and method in development machine hobboing cutter cutter ring section |
| CN113109195A (en) * | 2021-04-16 | 2021-07-13 | 清远南玻节能新材料有限公司 | Method for testing scratch resistance of plate |
| CN114112584A (en) * | 2021-11-19 | 2022-03-01 | 西安近代化学研究所 | Sample preparation kit for determining curing temperature of high-solid-content propellant powder and using method |
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Cited By (5)
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| CN110231238A (en) * | 2019-05-30 | 2019-09-13 | 吉林省维尔特隧道装备有限公司 | The gradient rigidity detection device and method in development machine hobboing cutter cutter ring section |
| CN110231238B (en) * | 2019-05-30 | 2020-04-24 | 吉林省维尔特隧道装备有限公司 | Gradient hardness detection device and method for section of hob ring of heading machine |
| CN113109195A (en) * | 2021-04-16 | 2021-07-13 | 清远南玻节能新材料有限公司 | Method for testing scratch resistance of plate |
| CN114112584A (en) * | 2021-11-19 | 2022-03-01 | 西安近代化学研究所 | Sample preparation kit for determining curing temperature of high-solid-content propellant powder and using method |
| CN114112584B (en) * | 2021-11-19 | 2023-07-18 | 西安近代化学研究所 | Sample preparation kit for determining curing temperature of high-solid-content propellant powder and use method |
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