CN109238838B - Rotary bending fatigue test fixture and method - Google Patents
Rotary bending fatigue test fixture and method Download PDFInfo
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- CN109238838B CN109238838B CN201811066708.1A CN201811066708A CN109238838B CN 109238838 B CN109238838 B CN 109238838B CN 201811066708 A CN201811066708 A CN 201811066708A CN 109238838 B CN109238838 B CN 109238838B
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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
- G01N3/02—Details
- G01N3/04—Chucks
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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
- G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending forces
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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
- G01N2203/003—Generation of the force
- G01N2203/0032—Generation of the force using mechanical means
- G01N2203/0033—Weight
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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
- G01N2203/006—Crack, flaws, fracture or rupture
- G01N2203/0067—Fracture or rupture
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Abstract
The invention discloses a rotary bending fatigue test fixture and a method, the test fixture comprises a coupling sleeve, a positioning shaft, a bearing and a bearing sleeve, the bearing is arranged in the bearing sleeve, one end of the coupling sleeve is fixedly arranged in an inner ring of the bearing, the other end of the coupling sleeve is provided with an installation hole for connecting one end of a test sample, the other end of the test sample is driven by a machine tool to do rotary motion, one end of the positioning shaft is arranged on the tail end of the machine tool, the other end of the positioning shaft is provided with a load device which is matched and connected with the bearing sleeve through a chute sliding block, the bearing sleeve is provided with a load device which applies load along the sliding direction of the chute, after the test sample is installed, the load device applies bending load to the bearing sleeve, the machine tool is started to drive the test sample to do rotary motion, the machine tool is stopped until the test sample, the material can be subjected to the rotary bending fatigue test without customizing complex driving equipment.
Description
Technical Field
The invention belongs to the field of material performance testing, relates to a material fatigue performance testing technology, and particularly relates to a rotary bending fatigue test fixture and a method, which can test the fatigue life and the fatigue strength of a material in a room temperature environment.
Background
The fatigue test is a test device for testing the fatigue strength and the fatigue life of materials. In the national standard GB/T4337-2008 'Metal Material fatigue test rotating bending method', a sample is assembled into a cantilever and subjected to single-point or double-point stress application; or assembled into a beam and then four-point force application is carried out. At present, the rotary bending fatigue testing machine which is mainly applied at home and works under high temperature by four-point stress has the restriction of factors such as overhigh requirement on the processing precision of a sample, overlarge weight loading capacity and the like, so that the cost is higher, and the rotary bending fatigue testing machine is difficult to popularize in the market. In the actual use condition of most materials, the fatigue failure of the materials is actually carried out at normal temperature, so that a lot of major accidents caused by the fatigue failure are highly regarded by the engineering field, but the lack of equipment for carrying out normal-temperature rotation bending fatigue test makes the current condition difficult to meet the market demand.
Disclosure of Invention
Aiming at the requirements of the existing conditions, the clamp designs a room temperature cantilever rotation bending fatigue test clamp which is simple in structure, accurate in loading, wide in application range and self-protected according to the national standard requirements.
The technical scheme adopted by the clamp for solving the technical problem is as follows:
the utility model provides a rotatory bending fatigue test anchor clamps which characterized in that: the bearing is installed in the bearing sleeve, one end of the coupling sleeve is fixedly installed in an inner ring of the bearing, the other end of the coupling sleeve is provided with an installation hole used for connecting one end of a test sample, the other end of the test sample is driven to rotate through a rotating motion device, one end of the positioning shaft is installed on a supporting device, the other end of the positioning shaft is provided with a sliding groove perpendicular to the axis of the bearing sleeve, the end portion of the bearing sleeve is provided with a sliding block installed in the sliding groove, and the bearing sleeve is provided with a load device applying load along the sliding direction of the sliding groove.
As an improvement, the rotary motion driving device is a machine tool, the test sample is fixed through a three-jaw chuck of the machine tool, and the positioning shaft is supported through a tailstock of the machine tool.
As an improvement, the load device is a weight device, an annular groove is formed in the outer portion of the bearing sleeve, the weight device is hung on the annular groove of the bearing sleeve through a connecting device, a sliding groove in a corresponding positioning shaft is arranged in the direction of a plumb bob, and the machine tool is a horizontal machine tool.
As an improvement, the weight device is a weight tray, and weights with different loads can be added on the weight tray according to requirements.
As an improvement, the connecting device is a soft iron wire or a steel wire rope.
As an improvement, the sliding groove on the positioning shaft is a dovetail groove, and the sliding block at the end part of the corresponding bearing sleeve is a dovetail sliding block.
As an improvement, a gap is reserved between the dovetail sliding block and the groove bottom of the dovetail groove.
As an improvement, the bearing is arranged in a bearing sleeve in an interference fit mode, the coupling sleeve is arranged in an inner ring of the bearing in an interference fit mode, and a threaded hole used for fixing a test sample is formed in the side face of a mounting hole of the coupling sleeve.
As an improvement, the end part of the bearing sleeve is provided with a dismounting hole which is convenient for dismounting the bearing.
A rotating bending fatigue test method is characterized by comprising the following steps:
the method comprises the following steps that firstly, a coupling sleeve is installed in an inner ring of a bearing in an interference fit mode, the bearing is installed in a bearing sleeve in the interference fit mode, the bearing sleeve is installed in a sliding groove of a positioning shaft, and the positioning shaft is installed on a tailstock of a horizontal machine tool and aligned;
fixing one end of a test sample in a shaft coupling sleeve through a bolt, and installing the other end of the test sample on a three-jaw chuck of a horizontal machine tool;
thirdly, applying a load in the direction of a plumb to the bearing sleeve through a weight;
and step four, starting the horizontal machine tool, driving the test sample to rotate under the bending load until the test sample is broken or reaches a preset rotation cycle number, and stopping the horizontal machine tool to finish the test.
The invention has the beneficial effects that:
the rotary bending fatigue test fixture can be clamped on a numerical control machine tool to carry out a rotary bending fatigue test on a metal material under a normal temperature condition, and test the fatigue strength and the fatigue life. The innovative direct weight loading design ensures that the clamp has simple structure, high reliability and convenient clamping; the bearing sleeve is matched and positioned with the sliding block and the sliding groove of the positioning shaft, so that the error caused by the misalignment of the fatigue test sample in the installation process is avoided, and the centering property is ensured. The screw fastening mode that allies oneself with axle sleeve and sample adopted can the sample of multiple dimensions of centre gripping, through experimental actual inspection, and it is not had the not hard up condition to stabilize all the time at rotatory in-process. A through hole is reserved behind the bearing sleeve, and the bearing is easy to disassemble, replace and repair if damaged after multiple tests. The three-jaw chuck of the machine tool is matched with the sample, the coupling sleeve, the bearing sleeve, the positioning shaft and the machine tool, the structure is simple, and the loading is convenient.
Drawings
FIG. 1 is a schematic sectional view of a rotary bending fatigue test fixture according to the present invention;
FIG. 2 is a partial schematic view of the test fixture of FIG. 1;
FIG. 3 is a schematic top view of a bearing housing;
FIG. 4 is a schematic top view of the positioning shaft;
FIG. 5 is a schematic top view of the coupling sleeve;
FIG. 6 is a schematic view of a rotary bending fatigue test fixture mounting load device of the present invention.
1-test sample, 2-coupling sleeve, 3-threaded hole, 4-bearing, 5-bearing sleeve, 6-annular groove, 7-positioning shaft, 8-dismounting hole, 9-sliding groove, 10-sliding block, 11-weight, 12-iron wire and 13-three-jaw chuck.
Detailed Description
Example (b): the present invention will be described below by way of example with reference to a horizontal machine tool as a rotary motion drive device.
As shown in figure 1, the rotary bending fatigue test fixture comprises a coupling sleeve 2, a bearing 4, a bearing sleeve 5 and a positioning shaft 7. The connection relationship is as follows: the coupling sleeve 2 is arranged in an inner ring of the bearing 4 in an interference fit manner, the bearing 4 is arranged in the bearing sleeve 5 in an interference fit manner, a sliding groove 9 in the plumb direction is arranged on the positioning shaft 7, the sliding groove 9 can be a dovetail groove, a sliding block 10 arranged in the sliding groove 9 on the positioning shaft 7 is arranged at the end part of the bearing sleeve 5, the corresponding sliding block 10 is a dovetail sliding block, the rear part of the positioning shaft 7 is a cylinder with a gradually reduced section, the gradient is 1:20, and the positioning shaft 7 can be aligned when arranged on a horizontal machine tool tailstock conveniently, and in the embodiment of the invention, the positioning shaft 7 can also be supported by other supporting devices, such as a bracket; an annular groove 6 for loading a load is formed in the middle of the bearing sleeve 5, a weight tray is hung on the annular groove 6 through an iron wire 12 and applies a load in the direction of a plumb bob to the bearing sleeve 5, and the weight tray is added or subtracted through a weight 11 to adjust the load; one end of the coupling sleeve 2 is fixedly installed in an inner ring of the bearing 4, the other end of the coupling sleeve is provided with a mounting hole used for connecting the test sample 1, a threaded hole 3 used for locking the test sample 1 is formed in the side face of the mounting hole of the coupling sleeve 2, one end of the test sample 1 is installed on a three-jaw chuck 13 of the horizontal machine tool and fixed through the three-jaw chuck 13, and the other end of the test sample 1 is installed in the mounting hole and fixed after penetrating through the threaded hole 3 through a screw.
The working principle is as follows: firstly, according to the specific size of the rotating bending fatigue test sample, calculating the stress relation corresponding to the weight of the loading weight through theory. The weight with corresponding weight is hung on the weight tray and is hung on the annular groove 6 on the bearing sleeve 5 through the iron wire 12, so that the test sample 1 is subjected to bending moment. And starting a motor of the numerical control machine tool, recording time and rotating speed, and driving the test sample 1 to rotate, bend and deform by the rotation of the three-jaw chuck 13. And in the loading process, the test sample 1 is broken, the motor is closed, the weight is taken down, and the test sample 1 is taken down after the test is finished. And if the test sample 1 does not crack after reaching the set cycle number, closing the power supply, taking down the weight, finishing the test and taking down the test sample 1.
As a specific embodiment, the bearing 4 of the invention can adopt a 6004 deep groove ball bearing, the section of the annular groove 6 on the bearing sleeve 5 is in a circular arc shape with phi 4.7mm, and in order to facilitate the dismounting and mounting of the bearing 4, two dismounting holes 8 with phi 6mm symmetry are arranged at the opposite end of the bearing sleeve 5.
It should be noted that in the embodiment of the present invention, the sliding groove 9 on the positioning shaft 7 is in the plumb direction, the weight tray is hung on the bearing sleeve 5 through the iron wire 12 to apply a load in the plumb direction, of course, the weight tray may not be needed, the required weight is directly strung up and hung on the annular groove 6 of the bearing sleeve 5 through the iron wire 12, even the weight or the weight tray may be connected to the bearing sleeve 5 through other manners, as long as the force in the plumb direction is applied, for example, the steel wire rope may be hung or the hook may be connected.
In order to avoid the test sample 1 to break, the bearing sleeve 5, the coupling sleeve 2 and the weight drop together, a 0.1mm action gap can be arranged between the sliding block 10 of the bearing sleeve 5 and the groove bottom of the sliding groove 9 of the positioning shaft 7, and thus, when the test sample 1 breaks, the bearing sleeve 5 inclines under the action of the weight and the bearing sleeve 5, the sliding block 10 on the bearing sleeve can be clamped in the sliding groove 9 and cannot drop, and the device can be effectively prevented from being damaged when being impacted on the ground.
As a more specific example, considering that the bearing housing 5 can slide relative to the positioning shaft 7 and the bearing housing 5 does not fall on the ground when the test sample 1 is broken, as shown in fig. 2, the sliding groove 9 may be provided as a dovetail groove having a groove depth of about 5mm, and the corresponding slider 10 on the bearing housing 5 may be a dovetail slider.
It should be noted that the load device of the present invention applies the load by the gravity of the weight, but may apply any load to the bearing housing 5 in a direction perpendicular to the axial direction thereof, in this case, the load application direction is not limited to the direction of the plumb, and may be the same as the direction of the sliding groove 9 on the positioning shaft 7, and the same drive for rotating the test sample 1 is not limited to a horizontal machine tool, but may be a vertical machine tool, and may be an electric drill or other motor.
Claims (7)
1. The utility model provides a rotatory bending fatigue test anchor clamps which characterized in that: the test device comprises a coupling sleeve, a positioning shaft, a bearing and a bearing sleeve, wherein the bearing is arranged in the bearing sleeve, one end of the coupling sleeve is fixedly arranged in an inner ring of the bearing, the other end of the coupling sleeve is provided with an installation hole used for connecting one end of a test sample, the other end of the test sample is driven by a rotary motion device to do rotary motion, one end of the positioning shaft is arranged on a supporting device, the other end of the positioning shaft is provided with a chute vertical to the axis of the bearing sleeve, the end part of the bearing sleeve is provided with a sliding block arranged in the chute, and the bearing sleeve is provided with a load device;
the rotary motion driving device is a machine tool, a test sample is fixed through a three-jaw chuck of the machine tool, and a positioning shaft is supported through a tailstock of the machine tool;
the sliding groove on the positioning shaft is a dovetail groove, the sliding block at the end part of the corresponding bearing sleeve is a dovetail sliding block, and a gap is reserved between the dovetail sliding block and the groove bottom of the dovetail groove.
2. The rotary bending fatigue test fixture of claim 1, wherein: the load device is a weight device, an annular groove is formed in the outer portion of the bearing sleeve, the weight device is hung on the annular groove of the bearing sleeve through a connecting device, a sliding groove in a corresponding positioning shaft is arranged in the plumb direction, and the machine tool is a horizontal machine tool.
3. The rotary bending fatigue test fixture of claim 2, wherein: the weight device is a weight tray, and weights with different loads can be added on the weight tray according to requirements.
4. The rotary bending fatigue test fixture of claim 2, wherein: the connecting device is a soft iron wire or a steel wire rope.
5. The rotary bending fatigue test fixture of any one of claims 1 to 4, wherein: the bearing is installed in the bearing sleeve in an interference fit mode, the coupling sleeve is installed in the inner ring of the bearing in an interference fit mode, and a threaded hole used for fixing a test sample is formed in the side face of the installation hole of the coupling sleeve.
6. The rotary bending fatigue test fixture of any one of claims 1 to 4, wherein: the end part of the bearing sleeve is provided with a dismounting hole which is convenient for dismounting the bearing.
7. A rotary bending fatigue test method using the rotary bending fatigue test jig of claim 5, characterized by comprising the steps of:
the method comprises the following steps that firstly, a coupling sleeve is installed in an inner ring of a bearing in an interference fit mode, the bearing is installed in a bearing sleeve in the interference fit mode, the bearing sleeve is installed in a sliding groove of a positioning shaft, and the positioning shaft is installed on a tailstock of a horizontal machine tool and aligned;
fixing one end of a test sample in a shaft coupling sleeve through a bolt, and installing the other end of the test sample on a three-jaw chuck of a horizontal machine tool;
thirdly, applying a load in the direction of a plumb to the bearing sleeve through a weight;
and step four, starting the horizontal machine tool, driving the test sample to rotate under the bending load until the test sample is broken or reaches a preset rotation cycle number, and stopping the horizontal machine tool to finish the test.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811066708.1A CN109238838B (en) | 2018-09-13 | 2018-09-13 | Rotary bending fatigue test fixture and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811066708.1A CN109238838B (en) | 2018-09-13 | 2018-09-13 | Rotary bending fatigue test fixture and method |
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| CN109238838A CN109238838A (en) | 2019-01-18 |
| CN109238838B true CN109238838B (en) | 2021-02-19 |
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| CN113649932A (en) * | 2020-04-28 | 2021-11-16 | 长三角先进材料研究院 | Longitudinal polishing system suitable for plate-shaped samples |
| CN114813410B (en) * | 2022-07-01 | 2022-09-16 | 沈阳美茵联合检测有限公司 | S/N curve fitting test method for rotary bending fatigue of aviation hydraulic conduit |
| CN116878878B (en) * | 2023-09-05 | 2023-11-14 | 万向钱潮股份公司 | Bearing test reinforcing and fastening device |
| CN117405585A (en) * | 2023-12-14 | 2024-01-16 | 天津六0九电缆有限公司 | Test method and equipment for rapidly judging loosening of wire insulation film |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE29908676U1 (en) * | 1999-05-17 | 1999-12-02 | Rms Regelungs Und Mestechnik D | Circulation bending testing machine |
| KR101277930B1 (en) * | 2011-09-28 | 2013-06-27 | 현대제철 주식회사 | Rotary bending fatigue tester |
| CN103203660A (en) * | 2013-05-07 | 2013-07-17 | 无锡华联科技集团有限公司 | Steel plate end face milling and centring device |
| US9976197B2 (en) * | 2014-11-24 | 2018-05-22 | Japan Casting & Forging Corporation | Method for producing journal part of 9 to 12% Cr steel turbine rotor, and journal part produced by the method |
| CN204514729U (en) * | 2015-04-20 | 2015-07-29 | 燕山大学 | Liner testing machine |
| CN105716851B (en) * | 2016-03-30 | 2018-06-19 | 华南理工大学 | A kind of valve rotation fatigue bending machine |
| CN106290026B (en) * | 2016-09-29 | 2023-03-21 | 华南理工大学 | Rotary bending fatigue testing machine |
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