CN110926980A - Three-wheel contact fatigue testing machine with combined action of environment and cyclic load - Google Patents
Three-wheel contact fatigue testing machine with combined action of environment and cyclic load Download PDFInfo
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- CN110926980A CN110926980A CN201911245311.3A CN201911245311A CN110926980A CN 110926980 A CN110926980 A CN 110926980A CN 201911245311 A CN201911245311 A CN 201911245311A CN 110926980 A CN110926980 A CN 110926980A
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- loading
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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
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
- G01N3/36—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces generated by pneumatic or hydraulic means
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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
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
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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
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0073—Fatigue
Abstract
A three-wheel contact fatigue testing machine under combined action of environment and cyclic load comprises a rack, a transmission device, a cyclic loading device, a signal monitoring and collecting device and an environment simulation device. The loading load adopted by the invention can change circularly, thereby simulating the situation that the load changes at any time in the actual working condition; the environment simulation fatigue test under the conditions of humidity, oil lubrication and gas blowing can be simulated; the testing machine can simultaneously perform contact fatigue tests on three samples, can simultaneously obtain three groups of data, and has a higher testing speed than that of equipment in which only two samples are in contact; the equipment has low cost and convenient sample loading and unloading.
Description
Technical Field
The invention relates to the technical field of machinery, in particular to a three-wheel contact fatigue testing machine under the combined action of environment and cyclic load.
Background
Rolling contact fatigue performance is an important technical index for evaluating the performance of components such as rolling contacts and bearings. Rolling contact fatigue in real conditions is often accompanied by a combined effect of environmental and cyclic loads. At present, a conventional constant-load rolling contact fatigue testing machine and a constant-load rolling contact fatigue testing machine with environment simulation exist internationally, the existing rolling contact fatigue testing machine only has two samples to roll in contact, only has two data at the same time, the experimental efficiency is low, and an efficient rolling contact fatigue testing machine with environment simulation variable load is not developed.
In the prior art, for example, a rolling contact fatigue testing machine capable of providing oil lubrication and temperature environment is disclosed in a working condition simulation rolling contact fatigue testing machine (chinese patent 200510012674.4), but the rolling contact fatigue testing machine is loaded by a constant load, is not a cyclic load, and cannot control humidity. The "high-speed rolling contact fatigue tester" (chinese patent 201310272071.2) discloses a rolling contact fatigue tester loaded by an electric cylinder, but the main shaft of the rolling contact fatigue tester is of a vertical structure and has no environment simulation device. "a roller element rolling contact fatigue tester" (chinese patent 201110346160.8) discloses a variable load oil-drop lubricated rolling contact fatigue tester, but it cannot control humidity, and it is not a three-specimen contact method. In actual conditions, environment and cyclic load act simultaneously, but at present, a rolling contact fatigue testing machine capable of achieving the combined action is not available.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides the rapid three-wheel contact fatigue testing machine under the combined action of the environment and the cyclic load, the testing machine can apply the cyclic load, control the required environment, simultaneously provide three groups of experimental data, and has the advantages of simple structure, simple and convenient operation and lower cost.
The technical scheme adopted by the invention is as follows:
the invention provides a three-wheel contact fatigue testing machine under combined action of environment and cyclic load, which comprises a rack: the rack is of a box-type structure, the upper part of the rack is provided with a table top, the lower part of the rack is provided with a base, a water tank and a hydraulic oil tank are respectively arranged below two sides of the base, and one side of the water tank and one side of the hydraulic oil tank are respectively provided with a drain hole and an oil drain hole; and a transmission device: the device comprises a servo motor fixed on a pedestal of the rack, a driving shaft fixed on the table top through a bearing support seat, a middle driven shaft and a loading driven shaft which are connected to one side of the driving shaft in a sliding manner through the bearing support seat, and one end of the driving shaft is connected with an output shaft of the servo motor through a poly-wedge belt; and a cyclic loading device: the device comprises a hydraulic cylinder fixed on one side of a table top, a telescopic loading head arranged at the output end of the hydraulic cylinder, and a hydraulic controller fixed on the other side of a rack base and connected with the hydraulic cylinder through an oil pipe, wherein a pressure gauge is also arranged on the hydraulic controller; the device transmits load to a loading driven shaft, an intermediate driven shaft and a driving shaft through extrusion of the loading head; and the signal monitoring and collecting device: the device comprises a data collector arranged on one side of a table top, a load sensor fixed on a loading head, a rotating speed sensor and a temperature sensor which are fixed on the side surfaces of a driving shaft, an intermediate driven shaft and a loading driven shaft, wherein an acceleration sensor is also arranged on a bearing supporting seat, and output signals of the sensors are collected by the data collector and transmitted to a computer for processing; and an environment simulation device: the device is including fixing the environment box on the mesa and setting up the environmental controller that one side is used for adjusting environment box internal conditions on the mesa, the environment box is all arranged in to driving shaft, middle driven shaft and loading driven shaft, just be provided with the inflow interface and the outflow interface of medium on the environment box.
The table top is fixed with a slideway, and the middle driven shaft and the loading driven shaft can horizontally move for a certain distance along the slideway and are kept on the same horizontal line with the axis of the driving shaft.
The load output by the cyclic loading device is a constant load, a sine wave load or a triangular wave load.
The environment controller can adjust the humidity, the air flow speed and the lubricating oil flow speed in the environment box.
The bottom of the environment box is made of rubber materials.
The main shaft is made of high-strength martensitic stainless steel.
Compared with the prior art, the invention has the following beneficial effects:
the loading load adopted by the invention can change circularly, so that the situation that the load changes at any time in the actual working condition is simulated, and the environment simulation fatigue test under the conditions of humidity, oil lubrication, gas blowing and the like can be simulated; the contact fatigue test of three samples can be carried out simultaneously, three groups of data are obtained simultaneously, and the test speed is higher than that of equipment with only two samples in contact; in addition, the invention has simple structure, lower production cost, very convenient sample loading and unloading and very ideal technical effect.
Drawings
FIG. 1 is a schematic top view of an embodiment of a three-wheel contact fatigue testing machine under the combined action of environment and cyclic load according to the present invention;
FIG. 2 is a schematic front view of the present invention;
FIG. 3 is a schematic view of the structure of a sample;
FIG. 4 is a case hardened alloy steel fatigue specimen.
Wherein, the reference numbers: 1-a rack, 2-a transmission device, 3-a cyclic loading device, 4-a signal detection and acquisition device, 5-an environment simulation device, 11-a table top, 12-a base, 13-a water tank, 14-a hydraulic oil tank, 15-a drain hole, 16-an oil drain hole, 17-a slideway, 18-a safety cover, 21-a private servo motor, 22-a bearing support seat, 23-a driving shaft, 24-a middle driven shaft, 25-a loading driven shaft, 31-a hydraulic cylinder, 32-a loading head, 33-an oil pipe, 34-a hydraulic controller, 35-a pressure gauge, 41-a data acquisition device, 42-a load sensor, 43-an acceleration sensor, 51-an environment box and 52-an environment controller.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
It should be noted that in the description of the present invention, it should be noted that the terms "upper", "lower", "top", "bottom", "one side", "the other side", "left", "right", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience of describing the present invention and simplifying the description, but do not mean that a device or an element must have a specific orientation, be configured in a specific orientation, and be operated.
Referring to fig. 1 and 2, the overall structure of an embodiment of the three-wheel contact fatigue testing machine with combined action of environment and cyclic load, which is proposed by the invention, is shown. The testing machine comprises a rack 1, a transmission device 2, a cyclic loading device 3, a signal monitoring and acquiring device 4 and an environment simulation device 5.
Wherein, rack 1 is box structure, and its upper portion is provided with mesa 11, and the lower part is provided with base 12, the below of base 12 both sides is provided with water tank 13 and hydraulic tank 14 respectively, just the side of water tank 13 is provided with wash port 15, the side of oil tank 14 is provided with oil drain hole 16, one side of water tank and hydraulic tank is provided with wash port and oil drain hole respectively, and hydraulic tank 14 is used for depositing hydraulic oil, and waste hydraulic oil accessible oil drain hole 16 discharges moreover, and hydraulic oil cools off through the cooling water, and the cooling water is arranged in water tank 13, and the cooling water is changed to accessible wash port 15.
The transmission device 2 comprises a servo motor 21 fixed on one side of the base of the rack, a driving shaft 23 fixed on the table board through a bearing support seat 22, a middle driven shaft 24 and a loading driven shaft 25 arranged on one side of the driving shaft 23, and one end of the driving shaft 23 is connected with an output shaft of the servo motor 21 through a poly-wedge belt 26; a slideway 17 is fixed in the area of the table top 11 on one side of the driving shaft 23, the intermediate driven shaft 24 and the loading driven shaft 25 are arranged on the slideway 17 through a bearing support seat, so that the intermediate driven shaft 24 and the loading driven shaft 25 can freely move for a certain distance in the horizontal direction, and the axes of the driving shaft 23, the intermediate driven shaft 24 and the loading driven shaft 25 are positioned on the same horizontal line; in this embodiment, the driving shaft 23 is made of a high-strength martensitic stainless steel material; the test sample 6 is respectively sleeved in the middle of the driving shaft 23, the middle driven shaft 24 and the loading driven shaft 25, and is shown in fig. 3 as a test sample schematic diagram, the outer diameter of the test sample is 70-85mm, the section of the test sample is in a boss shape, so that the contact stress is improved, and key grooves are formed in the test sample so as to be fixed on the shafts; the servo motor 21 can control the rotating speed through a frequency converter, and the rotating speed can be adjusted within the range of 0-1200 r/min.
The cyclic loading device 3 comprises a hydraulic cylinder 31 fixed on one side of the table top 11 through a bolt 36, a loading head 32 telescopically mounted at the output end of the hydraulic cylinder, and a hydraulic controller 34 fixed on the other side of the rack base 12 and connected with the hydraulic cylinder 31 through an oil pipe 33, wherein a pressure gauge 35 is further arranged on the hydraulic controller 34; the loading head 32 corresponds to the middle part of the loading driven shaft 25, and the device transmits load to the loading driven shaft 25, the middle driven shaft 24 and the driving shaft 23 through the extrusion of the loading head 32, so that the three test samples 6 are pressed together and keep good continuous contact; the cyclic loading device 3 can output a constant load, a sine wave load or a triangular wave load, the cyclic load can be adjusted within the range of 0-20kN through the hydraulic controller 34, and the frequency of the cyclic load can be adjusted within the range of 0.1-2 Hz.
The signal detection and acquisition device 4 comprises a data acquisition unit 41 arranged on one side of the table top 11, a load sensor 42 fixed between the loading head 32 and the hydraulic cylinder 31, and a rotational speed sensor and a temperature sensor (not shown in the figure) fixed on the side surfaces of the driving shaft 23, the intermediate driven shaft 24 and the loading driven shaft 25, an acceleration sensor 43 is further arranged on the bearing support seat 22, output signals of the load sensor 42, the acceleration sensor 43, the rotational speed sensor and the temperature sensor are all transmitted to a computer for processing, and the data acquisition unit 41 is used for acquiring and recording vibration data of the test sample 6 on the driving shaft 23, the intermediate driven shaft 24 and the loading driven shaft 25.
The environment simulation device 5 comprises an environment box 51 fixedly mounted on the table top 11 and an environment controller 52 arranged on one side of the table top 11 and used for adjusting the internal environment of the environment box 51, the driving shaft 23, the intermediate driven shaft 24 and the loading driven shaft 25 are all arranged in the environment box 51 in the test process, and an interface (not shown in the figure) for introducing media such as protective gas and lubricating oil to flow in and out is arranged on the environment box 51; the environment controller 52 can adjust the humidity, the air flow speed and the lubricating oil flow speed inside the environment box 51, can control the humidity to be 20-90%, the lubricating oil flow speed of 20-70 drops/min and the air flow of 0-20 liters/min, and the lubricating oil pump and the oil groove can be arranged on the base 12; the bottom of the environment box 51 is made of rubber materials, and plays a role in sealing.
In the testing machine, the safety cover 18 is arranged above the table top 11 in the testing process, so that the safety of the testing machine is improved.
Test examples
The invention is used for carrying out rolling contact fatigue test on the alloy steel with hardened surface, and the technological parameters are as follows: the rotating speed is 800r/min, the load is 18kN, the circulating load frequency is 0Hz, the humidity is 40%, the compressed air flow is 15L/min, and the test time is 60 h. The sample is polished before the experiment, the fatigue peeling phenomenon appears on the surface of the sample after the experiment, and the surface appearance is shown in figure 4.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (7)
1. The utility model provides an environment and cyclic load combined action's tricycle contact fatigue testing machine which characterized in that: the testing machine comprises
A rack: the rack is of a box-type structure, the upper part of the rack is provided with a table top, the lower part of the rack is provided with a base, a water tank and a hydraulic oil tank are respectively arranged below two sides of the base, and one side of the water tank and one side of the hydraulic oil tank are respectively provided with a drain hole and an oil drain hole;
the transmission device comprises: the device comprises a servo motor fixed on a pedestal of the rack, a driving shaft fixed on the table top through a bearing support seat, a middle driven shaft and a loading driven shaft which are connected to one side of the driving shaft in a sliding manner through the bearing support seat, and one end of the driving shaft is connected with an output shaft of the servo motor through a poly-wedge belt;
a cyclic loading device: the device comprises a hydraulic cylinder fixed on one side of a table top, a telescopic loading head arranged at the output end of the hydraulic cylinder, and a hydraulic controller fixed on the other side of a rack base and connected with the hydraulic cylinder through an oil pipe, wherein a pressure gauge is also arranged on the hydraulic controller; the device transmits load to a loading driven shaft, an intermediate driven shaft and a driving shaft through extrusion of the loading head;
signal monitoring collection system: the device comprises a data collector arranged on one side of a table board, a load sensor fixed on a loading head, a rotating speed sensor and a temperature sensor which are fixed on the side surfaces of a driving shaft, an intermediate driven shaft and a loading driven shaft, wherein an acceleration sensor is also arranged on a bearing supporting seat, and output signals of the sensors are collected by the data collector and transmitted to a computer for processing.
An environment simulation device: the device is including fixing the environment box on the mesa and setting up the environmental controller that one side is used for adjusting environment box internal conditions on the mesa, the environment box is all arranged in to driving shaft, middle driven shaft and loading driven shaft, just be provided with the inflow interface and the outflow interface of medium on the environment box.
2. A three-wheel contact fatigue tester for environmental and cyclic loads in combination according to claim 1, wherein: the table top is fixed with a slideway, and the middle driven shaft and the loading driven shaft can horizontally move for a certain distance along the slideway and are kept on the same horizontal line with the axis of the driving shaft.
3. A three-wheel contact fatigue tester for environmental and cyclic loads in combination according to claim 1, wherein: the load output by the cyclic loading device is a constant load, a sine wave load or a triangular wave load.
4. A three-wheel contact fatigue tester for environmental and cyclic loads in combination according to claim 1, wherein: the environment controller can adjust the humidity, the air flow speed and the lubricating oil flow speed in the environment box.
5. A three-wheel contact fatigue tester for environmental and cyclic loads in combination according to claim 1, wherein: the bottom of the environment box is made of rubber materials.
6. A three-wheel contact fatigue tester working under both environmental and cyclic loads according to any of claims 1-5, characterized by: the main shaft is made of high-strength martensitic stainless steel.
7. A three-wheel contact fatigue tester working under both environmental and cyclic loads according to any of claims 1-5, characterized by: a safety cover is arranged above the table top.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201911245311.3A CN110926980A (en) | 2019-12-06 | 2019-12-06 | Three-wheel contact fatigue testing machine with combined action of environment and cyclic load |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911245311.3A CN110926980A (en) | 2019-12-06 | 2019-12-06 | Three-wheel contact fatigue testing machine with combined action of environment and cyclic load |
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| CN110926980A true CN110926980A (en) | 2020-03-27 |
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| CN201911245311.3A Pending CN110926980A (en) | 2019-12-06 | 2019-12-06 | Three-wheel contact fatigue testing machine with combined action of environment and cyclic load |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112485148A (en) * | 2020-11-30 | 2021-03-12 | 合肥工业大学 | Three-point type sliding-rolling contact fatigue wear testing machine |
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2019
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Cited By (1)
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Application publication date: 20200327 |