Clamp suitable for fatigue test of steel ball sample

Abstract

The utility model discloses a fixture suitable for a fatigue test of a steel ball sample, which comprises a lower fixture part, an upper fixture part and a protective part, the lower fixture part is rigidly connected with a working table of a host, and the steel ball sample is placed in a spherical groove of the lower fixture part; the upper clamp part is rigidly connected with the loading part of the main machine, and the loading part of the main machine moves up and down to load a steel ball sample; the protection part is used for wrapping the periphery of the steel ball sample after the steel ball sample is placed in the spherical groove of the lower clamp part, a gap is reserved between the steel ball sample and the spherical groove, and a circular through hole is formed in the top end of the protection part and used for exposing the upper surface of the steel ball sample. The clamp is simple in structure and convenient to install, the labor intensity and the production cost are reduced, and the production efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of fixture, especially to a fixture suitable for steel ball sample fatigue test. BACKGROUND

[0002] The fatigue test of steel ball is to detect the fatigue limit of steel ball under the action of dynamic load and give the basis of actual fatigue-cycle number curve.

[0003] There is no standard test method for steel ball fatigue test in China at present.

[0004] Therefore, the utility model provides a fixture suitable for steel ball sample fatigue test. UTILITY MODEL CONTENT

[0005] The utility model discloses a kind of fixtures suitable for steel ball sample fatigue test, can satisfy the fatigue experiment of different specifications steel ball sample.

[0006] To achieve the above object, the utility model provides the following technical scheme:

[0007] A kind of fixture suitable for steel ball sample fatigue test, comprising:

[0008] Lower fixture component, the workbench surface of host computer is rigidly connected with the lower fixture component, and steel ball sample is placed in the spherical recess of lower fixture component;

[0009] Upper fixture component, the loading component of host computer is rigidly connected with the upper fixture component, and steel ball sample is loaded by the up-down movement of the loading component of host computer;

[0010] Protective component is used to be wrapped around steel ball sample and have gap after steel ball sample is placed in the spherical recess of lower fixture component, and the top of protective component is equipped with circular through-hole, for exposing the upper surface of steel ball sample.

[0011] Further, the lower fixture component includes lower fixture base and lower pressing head, and the workbench surface of host computer is rigidly connected with the lower fixture base, and the upper surface of lower pressing head forms the spherical recess for placing steel ball sample.

[0012] Further, the lower fixture base and lower pressing head are fixedly connected by first bolt.

[0013] Further, the upper surface of lower fixture base is formed with first positioning groove, and the lower surface of lower pressing head is formed with first positioning block, and first positioning block is matched with first positioning groove.

[0014] Further, the lower end of lower fixture base is external thread structure, and the lower end surface of lower fixture base is perpendicular to shaft center, and is rigidly connected with the workbench surface of host computer by external thread.

[0015] Further, the upper clamp component comprises an upper clamp base and an upper press head, the upper clamp base is rigidly connected with the loading component of the main machine, and the lower surface of the upper press head is formed in a convex shape.

[0016] Further, the upper clamp base and the upper press head are fixedly connected through a second bolt.

[0017] Further, the lower surface of the upper clamp base is formed with a second positioning groove, and the upper surface of the upper press head is formed with a second positioning block matched with the second positioning groove.

[0018] Further, the upper end of the upper clamp base is in an external thread structure, the upper end surface of the upper clamp base is perpendicular to the shaft center, and the upper end surface is rigidly connected with the loading component of the main machine through the external thread.

[0019] Further, the protective component is in a cylindrical structure, and the lower end of the protective component is fixed on the lower press head of the lower clamp component through a third bolt.

[0020] Compared with the prior art, the clamp provided by the utility model has the beneficial effects that:

[0021] The clamp provided by the utility model is suitable for fatigue test of a steel ball sample, and is used for completing fatigue test of the steel ball sample on a high-frequency fatigue testing machine. According to the characteristics of the fatigue test of the steel ball sample and the characteristics of the high-frequency fatigue testing machine, the sample steel ball only needs to be placed in the groove of the lower press head, the steel ball can be automatically centered under the action of its own gravity, and then the protective cover is installed, and the test can be performed. The clamp has a simple structure and is convenient to install, reduces labor intensity and production cost, and improves production efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can also be obtained by those skilled in the art according to these drawings.

[0023] Figure 1 The structure diagram of the clamp suitable for fatigue test of a steel ball sample provided by the utility model embodiment Figure 1 .

[0024] Figure 2 The structure diagram of the clamp suitable for fatigue test of a steel ball sample provided by the utility model embodiment Figure 2 .

[0025] Figure 3 The structure diagram of the lower clamp component provided by the utility model embodiment.

[0026] Figure 4 The structure schematic view of the lower clamp base is provided for the embodiment of the utility model.

[0027] Figure 5 The structure schematic view of the lower pressing head is provided for the embodiment of the utility model.

[0028] Figure 6 The structure schematic view of the upper clamp component is provided for the embodiment of the utility model.

[0029] Figure 7 The structure schematic view of the upper clamp base is provided for the embodiment of the utility model.

[0030] Figure 8 The structure schematic view of the upper pressing head is provided for the embodiment of the utility model.

[0031] Figure 9 The structure schematic view of the protection component is provided for the embodiment of the utility model.

[0032] Mark explanation:

[0033] 1, lower clamp component; 2, upper clamp component; 3, protection component; 4, steel ball sample; 5, loading component; 6, workbench surface; 7, lower clamp base; 8, lower pressing head; 9, spherical recess; 10, first bolt; 11, first positioning groove; 12, first positioning block; 13, upper clamp base; 14, upper pressing head; 15, protrusion; 16, second bolt; 17, second positioning groove; 18, second positioning block; 19, third bolt. Specific implementation

[0034] In order to make the technical personnel in the prior art better understand the technical scheme of the utility model, the utility model will be further introduced in detail in conjunction with the drawings and examples.

[0035] As Figures 1-2 Indicated, the utility model provides a kind of clamp suitable for steel ball sample fatigue test, including: lower clamp component 1, upper clamp component 2 and protection component 3.Wherein:

[0036] The lower clamp component 1 is rigidly connected with the workbench surface 6 of host computer, and the steel ball sample 4 is placed in the spherical recess 9 of lower clamp component 1;

[0037] The upper clamp component 2 is rigidly connected with the loading component 5 of host computer, and the steel ball sample 4 is loaded by the up-down movement of the loading component 5 of host computer;

[0038] The protective component 3 is used for wrapping around the steel ball sample 4 with a gap after the steel ball sample 4 is placed in the spherical groove of the lower clamp component 1, and the top end of the protective component 3 is provided with a circular through hole for exposing the upper surface of the steel ball sample 4.

[0039] As shown in the figure, the lower clamp component 1 comprises a lower clamp base 7 and a lower pressing head 8, the lower clamp base 7 is rigidly connected with the workbench surface 6 of the main machine, and the upper surface of the lower pressing head 8 forms a spherical groove 9 for placing the steel ball sample 4. Specifically, the lower clamp base 7 and the lower pressing head 8 are fixedly connected by a first bolt 10. Figures 3-5

[0040] In order to ensure the coaxiality, the joint surfaces of the lower clamp base 7 and the lower pressing head 8 are provided with positioning stops, specifically, the upper surface of the lower clamp base 7 is formed with a first positioning groove 11, and the lower surface of the lower pressing head 8 is formed with a first positioning block 12, which is matched with the first positioning groove 11.

[0041] The lower clamp base 7 is made of alloy structural steel and is subjected to quenching and tempering treatment to ensure its mechanical properties. The lower end of the lower clamp base 7 is externally threaded, the lower end surface of the lower clamp base 7 is perpendicular to the axis, and is rigidly connected with the workbench surface 6 of the main machine through external threads. Specifically, the rigid connection is achieved by gear pressing disc compression and elimination of thread gap.

[0042] The lower pressing head 8 is made of alloy die steel and has high strength and high hardness, and the overall hardness is above HRC 60 (higher than the hardness of the sample), which ensures the durability of the clamp. The top surface of the lower pressing head is provided with a spherical groove 9, and the spherical radius of the spherical groove is greater than the radius of the sample (steel ball) (about 8% larger is more appropriate), which can not only ensure the automatic centering of the steel ball in the groove under the action of its own gravity, but also has sufficient expansion margin in the case of steel ball breakage, so as to avoid damage to the clamp.

[0043] As shown in the figure, the upper clamp component 2 comprises an upper clamp base 13 and an upper pressing head 14, the upper clamp base 13 is rigidly connected with the loading component 5 of the main machine, and the lower surface of the upper pressing head 14 forms a protrusion 15. Specifically, the upper clamp base 13 and the upper pressing head 14 are fixedly connected by a second bolt 16. Figures 6-8 In order to ensure the coaxiality, the joint surfaces of the upper clamp base 13 and the upper pressing head 14 are provided with positioning stops, specifically, the lower surface of the upper clamp base 13 is formed with a second positioning groove 17, and the upper surface of the upper pressing head 14 is formed with a second positioning block 18, which is matched with the second positioning groove 17.

[0044]

[0045] ​​The upper clamp base 13 is made of alloy structural steel, and is subjected to quenching and tempering treatment to ensure mechanical properties.

[0046] The upper pressure head is made of alloy die steel, and has high strength and high hardness, and the overall hardness is higher than HRC60 (higher than the hardness of the sample), so as to ensure the durability of the clamp.

[0047] The protective component is a cylindrical structure, and the lower end of the protective component is fixed on the lower pressure head 8 of the lower clamp component 1 through the third bolt 19. Figure 9 The protective component 3 is a cylindrical structure, and the lower end of the protective component 3 is fixed on the lower pressure head 8 of the lower clamp component 1 through the third bolt 19.

[0048] The steel ball fatigue experiment is carried out on a high-frequency fatigue testing machine, and the mechanical properties of the sample (steel ball) under dynamic load are measured.

[0049] The utility model discloses a design can realize coaxial installation of lower clamp component and lower clamp component and host equipment, and the sample steel ball is automatically centered in the clamp, thereby ensuring that the loading center line and the mass center of the sample steel ball coincide, and the dynamic loading of the sample steel ball is completed through the up-down movement of the host loading component.

[0050] Therefore, the clamp of the utility model has simple structure, convenient operation, reliable positioning, low production cost and high efficiency, and can meet the fatigue experiment of different specifications of steel ball samples.

[0051] The above examples are only used to illustrate the technical solutions of the utility model, and not to limit them; although the utility model has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can be modified, or some technical features can be replaced equivalently, but these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the utility model.

Claims

1. A jig suitable for fatigue testing of a steel ball specimen, characterized by comprising: The utility model relates to a steel ball test sample loading device, which comprises the following components: a lower clamp component (1) rigidly connected with the workbench surface (6) of a main machine, a steel ball test sample (4) placed in the spherical groove (9) of the lower clamp component (1); an upper clamp component (2) rigidly connected with the loading component (5) of the main machine, the steel ball test sample (4) loaded by the up-and-down movement of the loading component (5) of the main machine; a protective component (3) wrapped around the steel ball test sample (4) with a gap left after the steel ball test sample (4) is placed in the spherical groove of the lower clamp component (1), the top end of the protective component (3) provided with a circular through hole for exposing the upper surface of the steel ball test sample (4).

2. The jig suitable for a fatigue test of a steel ball test piece according to claim 1, characterized by, The lower clamp component (1) comprises a lower clamp base (7) and a lower pressing head (8), the lower clamp base (7) rigidly connected with the workbench surface (6) of the main machine, the upper surface of the lower pressing head (8) forming the spherical groove (9) for placing the steel ball test sample (4).

3. The jig suitable for fatigue test of a steel ball test piece according to claim 2, characterized by The lower clamp base (7) and the lower pressing head (8) are fixedly connected through the first bolt (10).

4. The jig suitable for a fatigue test of a steel ball test piece according to claim 3, characterized by The upper surface of the lower clamp base (7) is provided with the first positioning groove (11), and the lower surface of the lower pressing head (8) is provided with the first positioning block (12) matched with the first positioning groove (11).

5. The jig suitable for fatigue test of a steel ball test piece according to claim 2, wherein The lower end of the lower clamp base (7) is an external thread structure, the lower end surface of the lower clamp base (7) is perpendicular to the axis, and the lower clamp base (7) is rigidly connected with the workbench surface (6) of the main machine through the external thread.

6. The jig suitable for a fatigue test of a steel ball test piece according to claim 1, characterized by The upper clamp component (2) comprises an upper clamp base (13) and an upper pressing head (14), the upper clamp base (13) rigidly connected with the loading component (5) of the main machine, and the lower surface of the upper pressing head (14) forming the protrusion (15).

7. The jig suitable for fatigue test of a steel ball test piece according to claim 6, wherein The upper clamp base (13) and the upper pressing head (14) are fixedly connected through the second bolt (16).

8. The jig suitable for a fatigue test of a steel ball test piece according to claim 7, characterized by The lower surface of the upper clamp base (13) is provided with the second positioning groove (17), and the upper surface of the upper pressing head (14) is provided with the second positioning block (18) matched with the second positioning groove (17).

9. The jig suitable for fatigue test of a steel ball test piece according to claim 6, wherein The upper end of the upper clamp base (13) is an external thread structure, the upper end surface of the upper clamp base (13) is perpendicular to the axis, and the upper clamp base (13) is rigidly connected with the loading component (5) of the main machine through the external thread.

10. The jig suitable for fatigue test of a steel ball test piece according to claim 1, wherein The protective component (3) adopts a cylindrical structure, and the lower end of the protective component (3) is fixed on the lower pressing head (8) of the lower clamp component (1) through the third bolt (19).

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