Surface hardness testing system

Abstract

The utility model provides a surface hardness testing system which comprises a surface hardness meter and a base, the base comprises a first surface and a second surface opposite to the first surface, the first surface is a plane, and the second surface is provided with a V-shaped groove for accommodating an object to be tested. According to the surface hardness testing system disclosed by the utility model, the to-be-tested object is accommodated in the V-shaped groove of the base, so that the to-be-tested object can be better stabilized, and the probe of the surface hardness tester is more reliably contacted with the surface of the to-be-tested object; and the measurement accuracy of the surface hardness of the to-be-measured object, especially a small-diameter curved-surface object (such as a round roller or a round ball), is further improved.

Description

Technical Field

[0001] The utility model relates to a surface hardness testing system, and particularly to a testing system suitable for testing the surface hardness of an object with a small-diameter curved surface (such as a round roller or a ball). Background Art

[0002] At present, there is no testing equipment and method specifically designed for testing the surface hardness of small round rollers or balls. Conventional handheld surface hardness testers usually measure the hardness of flat samples. However, when using a handheld surface hardness tester to measure the surface hardness of a round roller or a ball, especially a round roller or a ball with a small radius, the repeatability of the measurement is very poor, and there may be a measurement deviation of more than 5%.

[0003] Therefore, it is necessary to develop a surface hardness testing system that can improve the measurement accuracy of the surface hardness of an object with a small-diameter curved surface (such as a round roller or a ball). Summary of the Utility Model

[0004] One of the purposes of the utility model is to provide a surface hardness testing system that can improve the measurement accuracy of the surface hardness of an object with a small-diameter curved surface (such as a round roller or a ball).

[0005] According to one aspect of the utility model, a surface hardness testing system is provided, including: a surface hardness tester and a base. The base includes a first surface and a second surface opposite to the first surface. The first surface is a plane, and the second surface has a V-shaped groove for accommodating the object to be tested.

[0006] Preferably, the surface hardness tester and the V-shaped groove are arranged such that the axis of the probe of the surface hardness tester is tangent to the contact point of the object to be tested accommodated in the V-shaped groove. Optionally, the two side walls of the V-shaped groove are symmetrically arranged. The surface hardness tester is arranged such that the axis position of the probe of the surface hardness tester and the lowest point of the V-shaped groove are on the same vertical line.

[0007] The utility model has the following beneficial effects: Through the surface hardness testing system of the utility model, the object to be tested is accommodated in the V-shaped groove of the base, which can better stabilize the object to be tested and make the probe of the surface hardness tester contact the surface of the object to be tested more reliably, thereby improving the measurement accuracy of the surface hardness of the object to be tested, especially an object with a small-diameter curved surface (such as a round roller or a ball). Description of the Drawings

[0008] To more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings only exemplarily show some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings. Moreover, these drawings should not be construed as any limitation on the present utility model.

[0009] Figure 1 is a schematic diagram of a surface hardness testing system according to an embodiment of the present utility model;

[0010] Figure 2 is a schematic diagram of the base of a surface hardness testing system according to an embodiment of the present utility model;

[0011] Figure 3 is a schematic diagram of the contact between the probe of a surface hardness tester in the prior art and the surface of an object to be tested (part);

[0012] Figure 4 is a schematic diagram of the base size of a surface hardness testing system according to an embodiment of the present utility model. Detailed implementation manners

[0013] It should be noted that the following embodiments are exemplary descriptions of the present utility model, and the features in different embodiments can be combined with each other without conflict. The present utility model will be described in detail below with reference to the drawings and specific embodiments.

[0014] As Figure 1 shown is a schematic diagram of a surface hardness testing system 100 according to an embodiment of the present utility model.

[0015] As Figure 1 and Figure 2 shown, the surface hardness testing system 100 includes a surface hardness tester 20 and a base 10. The base 10 includes a first surface 11 and a second surface 12 opposite to the first surface 11. The first surface 11 is a plane, and the second surface 12 has a V-shaped groove 13 to accommodate the object to be tested 50.

[0016] The surface hardness tester 20 can be any hardness tester commercially available in the market for measuring the surface hardness of an object, and the specific model is selected according to needs. For example, the HTS-200A digital Shore hardness tester. The surface hardness tester 20 includes a probe 21, and the probe 21 is generally vertically suspended and directly contacts the object to be tested 50 during testing. Preferably, the surface hardness tester 20 is a suspended surface hardness tester.

[0017] The surface hardness tester 20 and the V-groove 13 are arranged such that the axis 22 of the probe 21 of the surface hardness tester 20 is tangent to the contact point of the object 50 to be measured accommodated in the V-groove 13. This can ensure a close and reliable contact between the probe 21 and the surface of the object 50 to be measured, reducing measurement errors.

[0018] Preferably, the two side walls of the V-groove 13 of the base 10 are symmetrically arranged. The surface hardness tester 20 is arranged such that the position of the axis 22 of the probe 21 of the surface hardness tester 20 and the lowest point 14 of the V-groove 13 are on the same vertical line. That is, the lowest point 14 of the V-groove 13 is located at the position of the vertical line 22 of the probe 21 of the surface hardness tester 20.

[0019] Preferably, the surface hardness testing system 100 further includes a bracket 30, and the surface hardness tester 20 is arranged to be suspended on the bracket 30. The bracket 30 includes a vertical rod 31 and a horizontal rod 32. The horizontal rod 32 is fixed on the vertical rod 31, and the height of the horizontal rod 32 from the horizontal plane is adjustable. The surface hardness tester 20 is arranged to be suspended on the horizontal rod 32 of the bracket 30, so that the height of the probe 21 of the surface hardness tester 20 from the object 50 to be measured is adjusted by adjusting the height of the horizontal rod 32 from the horizontal plane.

[0020] The surface hardness testing system 100 further includes a platform 40, and the bracket 30 and the base 10 are arranged on the platform 40.

[0021] In another embodiment, the surface hardness tester 20, the bracket 30 and the platform 40 can be integrally arranged and directly commercially available, such as the HTS-200A digital Shore hardness tester.

[0022] The surface hardness testing system 100 provided by the embodiment of the present utility model has a unique V-groove, which can accommodate the object to be measured and clamp it in the V-groove, and is particularly suitable for accommodating objects with curved surfaces such as cylindrical objects to be measured (such as round rollers) or spherical objects to be measured. In the prior art, generally, small-diameter round rollers or balls or other cylindrical objects to be measured are placed on a plane, which is easy to roll. Moreover, when the probe of the surface hardness tester deviates from the axis of the object to be measured, if the surface of the object to be measured is curved, the probe cannot effectively contact the measured surface, resulting in an error distance. Therefore, it will cause poor contact between the probe 21 of the surface hardness tester 20 and the surface of the object 50 to be measured, resulting in measurement errors.

[0023] The surface hardness testing system 100 provided by the embodiment of the present utility model can conveniently place the object 50 to be measured in the V-groove of the base. The V-groove can better stabilize the object 50 to be measured and make the probe 21 of the surface hardness tester 20 contact the surface of the object 50 to be measured more reliably, avoiding errors caused by the probe not vertically contacting the surface of the round roller, thereby improving the measurement accuracy of the surface hardness of the object to be measured, especially objects with small-diameter curved surfaces (such as round rollers or balls or other cylindrical objects to be measured).

[0024] The surface hardness testing system 100 provided by the embodiments of the present utility model does not particularly limit the object to be tested, which can be a flat object or a curved object. However, the surface hardness testing system 100 provided by the embodiments of the present utility model is particularly applicable to the object to be tested 50 being an object with a small-diameter curved surface, such as a cylindrical object to be tested (such as a round roller) or a spherical object to be tested.

[0025] Such as Figure 3 Schematically illustrates that there is a measurement error due to poor contact between the probe 21 of the surface hardness tester and the surface of the object to be tested (part) 50. There is the following relationship between the barrel radius d of the probe 21, the radius r of the object to be tested 50 (schematically selected as a round roller), and the error s: s 2 + d 2 = r 2 .

[0026] According to the national standard GB / T531 - 1999, the stroke of the probe is 2.5 mm. When the measurement error rate is 5%, s = 2.5 * 0.05 = 0.125 mm can be calculated; the radius d of the probe barrel is 7.5 mm, and thus the radius r of the cylinder can be calculated as r = d 2 / (2s) = (7.5 * 7.5) / (2 * 0.125) = 225 mm. That is, when the radius of the cylinder is less than 225 mm, a measurement error of more than 5% may occur when using a traditional surface hardness tester.

[0027] Based on the above calculations, the object to be tested particularly applicable to the surface hardness testing system 100 provided by the embodiments of the present utility model is a cylindrical object to be tested or a spherical object to be tested with a radius less than 225 mm.

[0028] Preferably, in order to stably place the object to be tested on the V-shaped base, it can be ensured that the contact point / tangent point of the object to be tested and the V-shaped groove is within the V-shaped groove. Such as Figure 4 As shown, since the distance between the two contact points of the object to be tested 50 and the V-shaped groove 13 is 2d, and d = r × sinθ, the width D of the V-shaped groove needs to meet the requirement of D > 2r × sinθ. The corresponding opening angle of the V-shaped groove can be designed according to the radius of the object to be tested, and the width of the V-shaped groove can be confirmed.

[0029] Example verification

[0030] In order to measure the surface hardness of a small round roller, the inventor team first tried the traditional method: using a handheld surface hardness tester for measurement. During the test, 3 operators used the handheld hardness tester to measure 5 small round roller samples, and then performed a repeatability analysis on the measurement results. The results showed that the repeatability and reproducibility analysis value (GageR&R) of this test method was 57%, indicating poor repeatability of the method and unreliable measurement results.

[0031] After using the surface hardness testing system provided by the present utility model, three operators tested the same five small round roller samples, conducted an R&R analysis on the measured surface hardness data, and the result of Gage R&R obtained was 10.5%, indicating that the measurement system has good repeatability, stable and reliable results, and can meet the requirements of production inspection.

[0032] The above comparative test results fully illustrate that the surface hardness testing system 100 provided by the embodiment of the present utility model is particularly applicable to curved surface test objects such as cylindrical test objects or spherical test objects, and can improve the measurement accuracy.

[0033] It can be understood that the embodiments described above are only for description and not for limiting the present utility model. Those skilled in the art can understand that the present utility model can be modified and deformed as long as it does not deviate from the spirit and scope of the present utility model. The above modifications and deformations are considered to be within the scope of the present utility model and the appended claims. The protection scope of the present utility model is defined by the appended claims. In addition, any reference signs in the claims should not be construed as limiting the present utility model. The verb "comprising" and its variations do not exclude the presence of other elements or steps other than those stated in the claims. The indefinite article "a" before an element or step does not exclude the presence of a plurality of such elements or steps.

Claims

1. A surface hardness testing system, comprising a surface hardness tester, characterized in that: The device also includes a base, which includes a first surface and a second surface opposite to the first surface. The first surface is a plane, and the second surface has a V-shaped groove to accommodate an object to be measured.

2. The surface hardness testing system according to claim 1, characterized in that: The surface hardness tester and the V-shaped groove are arranged so that the axis of the probe of the surface hardness tester is tangent to the contact point of the object to be tested contained in the V-shaped groove.

3. The surface hardness testing system according to claim 1, characterized in that: The two side walls of the V-shaped groove are symmetrically arranged.

4. The surface hardness testing system according to any one of claims 1 to 3, characterized in that: The surface hardness tester is arranged so that the axis position of the probe of the surface hardness tester and the lowest point of the V-shaped groove are on the same vertical line.

5. The surface hardness testing system according to any one of claims 1 to 3, characterized in that: It also includes a bracket, and the surface hardness tester is arranged to be suspended on the bracket.

6. The surface hardness testing system according to claim 5, characterized in that: The bracket comprises a vertical rod and a cross rod, the cross rod is fixed on the vertical rod, and the height of the cross rod from the horizontal plane is adjustable.

7. The surface hardness testing system according to claim 5, characterized in that: It also includes a platform, and the bracket and the base are arranged on the platform.

8. The surface hardness testing system according to any one of claims 1 to 3, characterized in that: The object to be measured is cylindrical or spherical.

9. The surface hardness testing system according to claim 8, characterized in that: The radius of the object to be measured is less than 225 mm.

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