CN109916810B - Dry sliding friction pair interface transient temperature simulation and test system and disc module - Google Patents
Dry sliding friction pair interface transient temperature simulation and test system and disc module Download PDFInfo
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Abstract
The invention discloses a dry sliding friction pair interface transient temperature simulation and infrared test system, and belongs to the field of optical measurement. The dry sliding friction pair interface transient temperature simulation and infrared test system mainly comprises a working condition simulation module and an infrared test module. The working condition simulation module comprises a controller, a motor, a compressor, a heater, an executing mechanism and a disk module; the infrared testing module comprises an infrared temperature measuring probe, a signal conditioning box, a collecting card and an upper computer; the system can simulate various dry sliding friction pair interface transient temperature values in production and life with high precision. The invention also provides a disk-to-disk sliding friction structure module capable of realizing the simulation and test of the transient temperature of the dry sliding friction pair interface, which has the advantages that: the embedded infrared temperature measurement probe adopts a non-contact temperature measurement structure design, so that the temperature response time is fast and the error is small; the structure is simple, and the friction sample piece is convenient to replace; the temperature simulation range is large, and the working condition simulation at the temperature of-30 ℃ to 500 ℃ can be realized.
Description
Technical Field
The invention relates to a transient temperature simulation and infrared test system for a dry sliding friction pair interface, and belongs to the field of optical measurement.
Background
Sliding friction is a phenomenon that a contact interface generates to prevent relative movement when one object slides on the surface of another object. Dry sliding friction occurs at various corners in production and life, such as slides, rails, dry clutches and brakes. The transient temperature field of the friction pair interface needs to be known to analyze the friction performance, physical and chemical characteristics, mechanical deformation and the like of the contact surface, so that the performance of the friction element is better improved, and the service life is prolonged. At present, the surface transient temperature testing equipment for objects is mainly divided into two measuring schemes of contact type and non-contact type, for example, an optical fiber sensor, a thermocouple and the like are contact type temperature measuring equipment, and an infrared thermal imaging probe, an infrared temperature measuring probe and the like belong to non-contact type temperature measuring equipment.
The traditional dry sliding friction pair interface transient temperature measurement scheme is mainly applied to the fields of product research and development and basic scientific research. For example, wu Jingui (patent application No. 201710164291.1) proposes a transient temperature measurement system based on FPGA, but for the sliding friction field, the problem of installation space of the temperature measurement system is not fully considered; in the field of high-speed aircrafts, wu Dafang (patent application number 200610113792.9) and the like propose a carbon fiber composite material high-speed aircraft fairing surface transient temperature measurement device, which adopts a thermocouple contact type temperature measurement scheme, has doubtful signal response speed and has single application occasion; in the application of a dry clutch, zhang Zhigang (patent application number 201210416067.4) proposes a scheme of punching and measuring temperature on one side of a friction plate of the clutch by using an infrared temperature measurement technology, but the whole system has poor compatibility, is only applied to the field of clutches, and needs to use a clutch object for installation, so that the cost is high; similar to the above, there is a similar problem with a wet clutch friction pair temperature measurement system and method as proposed by Wang Liyong (patent application No. 2015111770. X) et al. Therefore, in the aspect of simulating and testing the transient temperature of the dry sliding friction pair interface, although the alternative technical schemes are more, the defects of the dry sliding friction pair interface are larger or smaller.
At present, the surface transient temperature testing equipment for objects is mainly divided into two measuring schemes of contact type and non-contact type, for example, an optical fiber sensor, a thermocouple and the like are contact type temperature measuring equipment, and an infrared thermal imaging probe, an infrared temperature measuring probe and the like belong to non-contact type temperature measuring equipment. Firstly, the contact type temperature measurement scheme needs to embed a sensor into a friction element at any side, namely, the temperature measurement value is not truly in contact with the interface temperature, so that the error is larger, and the general dynamic response speed of the contact type temperature measurement scheme is slower; although the corresponding speed is higher, the non-contact temperature measurement scheme is mostly limited by the space and the optical characteristics of the friction element, and the transient temperature of the surface-to-surface contact friction pair interface cannot be well measured, so that the non-contact temperature measurement scheme has larger error; for dry friction elements widely applied to various fields, the existing interface transient temperature simulation and test equipment is difficult to reproduce working conditions such as friction materials, ambient temperature, relative rotation speed and the like in actual friction; in addition, the dry friction pair transient temperature measurement equipment applied to a single field needs embedded installation, and has high cost for heavy machinery, complex system and poor compatibility.
Disclosure of Invention
Aiming at the defects of the surface transient temperature test equipment in the prior art, the dry sliding friction pair interface transient temperature simulation and infrared test system disclosed by the invention aims to solve the technical problems that: the system can be applied to the simulation and test of the transient temperature of the dry sliding friction pair interface in multiple fields, and can simulate the transient temperature values of various dry sliding friction pair interfaces in production and life with high precision. The invention has the following advantages: by adopting a punching non-contact temperature measurement scheme, the error can be reduced to a great extent; the actual working condition can be reproduced in the simulation process, so that the simulated temperature value has higher credibility; the friction sample is convenient to replace, and is suitable for various fields and various friction materials; the structure is simple and convenient, only a small sample is required to be processed, and the cost can be saved to a great extent.
The invention also discloses a disk module for a dry sliding friction pair interface transient temperature simulation and infrared test system, which aims to solve the technical problems that: the disk-to-disk sliding friction structure module can simulate and test the transient temperature of a dry sliding friction pair interface. Has the advantages that: the embedded infrared temperature measurement probe adopts a non-contact temperature measurement structure design, so that the temperature response time is fast and the error is small; the structure is simple, only a small sample is required to be processed, and the friction sample piece is convenient to replace; the temperature simulation range is large, and the working condition simulation at the temperature of-30 ℃ to 500 ℃ can be realized.
The invention is realized by the following technical scheme.
The invention discloses a dry sliding friction pair interface transient temperature simulation and infrared test system which mainly comprises a working condition simulation module and an infrared test module. The working condition simulation module comprises a controller, a motor, a compressor, a heater, an executing mechanism and a disk module; the infrared testing module comprises an infrared temperature measuring probe, a signal conditioning box, a collecting card and an upper computer.
The working condition simulation module works by sending an instruction to the controller by the upper computer, and sending a control signal to the motor, the compressor or the heater by the controller according to different instructions. The executing mechanism is used for providing a relative rotation speed difference of 0-5000r/min for the disc module and a contact pressure of 0-8000N; the compressor and the heater are used for providing an environment temperature of minus 30 ℃ to 500 ℃ for the disk module, so that the interface friction working condition of the dry sliding friction pair is simulated.
The infrared test module works by transmitting temperature signals into a signal conditioning box through two paths of infrared temperature measuring probes arranged in the disk module, transmitting the temperature signals to an acquisition card after filtering, signal amplification and A/D conversion signal conditioning links, and displaying and controlling the temperature signals through an upper computer. Wherein the range of the infrared temperature measuring probe is-50 ℃ to 600 ℃, the precision is better than 0.3 percent, and the response speed is less than or equal to 5ms.
The invention discloses a working method of a dry sliding friction pair interface transient temperature simulation and infrared test system, which comprises the following steps:
step one: and setting parameters of the upper computer, including relative linear speed, ambient temperature, contact pressure, contact angle and sliding time of the object to be simulated.
Step two: and calculating the heat flux density of the complete conversion of the sliding friction work by an upper computer, judging whether the friction material has an excessively strong destructive effect, namely verifying the rationality of parameter setting, and repeating the parameter setting link if the rationality is unreasonable.
In the second step, the excessively strong damage action means that the damage parameter exceeds a preset threshold value, and the threshold value is preferably a material safety threshold value in an upper computer software configuration database.
Step three: and step one, after the parameter setting is completed, a sliding starting instruction is sent out, a controller sends out a control signal, and meanwhile, the test module is started, and temperature data starts to be collected at a high speed and displayed in real time.
Step four: and judging whether the ambient temperature and the relative rotating speed of the disc module reach target set values in sequence, if not, waiting until the target values are reached, and then performing pressurized engagement to start sliding friction.
Step five: judging whether the sliding time reaches the set target sliding time, waiting until the sliding time reaches the target value, releasing pressure and separating, and further stopping the motor and the temperature control.
Step six: after a data storage instruction is sent, the upper computer stores collected data and provides a data playback function.
Step seven: and (3) realizing single dry sliding friction auxiliary interface transient temperature simulation and infrared test according to the steps from the first step to the sixth step.
Step eight: according to actual needs, the simulation and infrared test of the transient temperature of the dry sliding friction pair interface under different working conditions of corresponding times are carried out, so that the simulation and test of the transient temperature of the dry sliding friction pair interface applied to multiple fields are realized, and the transient temperature values of various dry sliding friction pair interfaces in production and life can be simulated with high precision.
The fields include vehicle friction drive and braking, rock and metal thermophysical property detection, conveyor belt product development, and temperature field analysis of various friction elements.
As an improvement, the upper computer software is written in a simple modularized programming environment, so that the later development is facilitated. The interface mainly comprises a working condition simulation module, an infrared test module and basic keys. The working condition simulation module mainly completes the setting of relative linear speed, ambient temperature, contact pressure, contact angle, sliding time and the like, the setting ranges are 0-60m/s, 30-500 ℃,0-7500N,0-90 DEG and 0-24h in sequence, and the working condition safety indicator light prompts whether the simulation working condition is reasonable and safe; the infrared test module mainly completes the display of two paths of infrared temperature signals, and alarms when the difference of the two paths of infrared temperature signals exceeds a preset threshold value, so as to prompt the sensor to fail or the sliding plane to have a centering problem; basic keys include start swipe, data storage, data playback, emergency stop and exit from the system.
As an improvement, the dry sliding friction working condition simulation module mainly adopts disk-to-disk friction, namely a disk-to-disk module. The disc module mainly comprises a rotating shaft, a workbench, an upper test piece, a lower test piece, a box cover, a flexible clamp, a heating wire and cooling liquid. The peripheral equipment comprises a motor, a rotating speed executing mechanism and a pressure executing mechanism. Connection relation: the motor in the peripheral equipment is connected with a rotating speed executing mechanism through a gear, the rotating speed executing mechanism is connected with a rotating shaft, the rotating shaft is fixedly connected with a workbench, and a test piece is fixed on the workbench; the pressure executing mechanism in the peripheral equipment is connected with a flexible clamp, the flexible clamp is fixedly connected with an upper test piece, and an infrared temperature measuring probe is embedded in the upper test piece; the box cover on the outer sides of the upper test piece and the lower test piece is connected with the box body through fastening screws, the box body is fixedly connected with the equipment shell, heating wires and cooling liquid are distributed in the box body wall, and the heating wires are separated from the cooling liquid through a separation layer. The disc module working method comprises the following steps: the motor drives the rotating shaft and the workbench to rotate, and the lower test piece rotates along with the workbench; the upper test piece is applied with a certain contact pressure by a pressure executing mechanism, and two paths of infrared temperature measuring probes are arranged at the middle and outer diameter parts of the upper test piece through holes to monitor the instant temperature of a contact interface in real time; the heater strip is used for improving ambient temperature rapidly, and the coolant liquid of connecting the compressor is used for reducing ambient temperature, and the case lid plays the heat preservation effect.
The upper test piece and the lower test piece are collectively called a friction sample piece, and as a further improvement, the basic structure of the friction sample piece is simpler, and the repeated processing is convenient. The upper test piece consists of a friction layer, a base layer and two infrared temperature measuring probes. The friction layer and the lower test piece respectively correspond to friction pair materials to be simulated, and the friction layer and the lower test piece conduct contact friction. The infrared temperature measuring probe is arranged at the middle outer diameter of the upper test piece through the through hole, and the detection point directly refers to the friction interface but does not contact the friction interface. The middle part of the upper test piece is provided with through holes for screw fixation and uniformly distributed threaded holes for flexible clamping, the middle part of the lower test piece is provided with through holes for screw fixation, and two sides of the lower test piece are provided with positioning holes.
As a further improvement, the rotating shaft is preferably in threaded connection with the workbench, the pressure actuating mechanism and the flexible clamp, and the rotating speed actuating mechanism and the rotating shaft; the box cover, the flexible clamp, the infrared temperature measuring probe, the workbench and the rotating shaft are standard components, and when a single component is damaged, the box cover, the flexible clamp, the infrared temperature measuring probe, the workbench and the rotating shaft are continuously used through replacement;
The number of the infrared temperature measuring probes is two, the infrared temperature measuring probes are symmetrically distributed at 180 degrees, and one path is selected as a signal checking path; the thickness of the friction layer of the upper test piece can be flexibly adjusted, and is preferably 5-8mm; the embedded depth of the infrared temperature measurement probe can be flexibly adjusted, and the distance between the top end of the probe and the contact interface is preferably 10-15mm; the cooling liquid is required to have stable characteristics and high cooling rate, and R290 is preferable.
When the normal working condition of the dry clutch of the household car is simulated, the friction layer material of the upper test piece is paper-based powder metallurgy, the material of the lower test piece is 65Mn steel, and the working condition parameters are relative linear speed 25m/s, ambient temperature 60 ℃, contact pressure 200N, contact angle 0 degree and sliding time 2s.
The beneficial effects are that:
1. The system for simulating and testing the transient temperature of the dry sliding friction pair interface disclosed by the invention can simulate the transient temperature problem of the dry sliding friction pair interface in production and life, and various actual working conditions are reproduced by replacing corresponding friction materials and parameter settings, so that the system has very wide applicability.
2. According to the system for simulating and testing the transient temperature of the dry sliding friction pair interface, disclosed by the invention, through a punching embedded non-contact infrared temperature measurement scheme, the range of an infrared temperature measurement probe is-50-600 ℃, the accuracy is 0.3%, the response speed is less than or equal to 5MS, a punching embedded friction upper test piece is provided with a high-speed data acquisition and storage function with a 16-bit 8-channel sampling rate of 80MS/s, the testing accuracy is high, the response speed is high, and the system has obvious advantages compared with the traditional contact temperature measurement scheme.
3. According to the system for simulating and testing the transient temperature of the dry sliding friction pair interface, disclosed by the invention, by arranging two paths of infrared temperature measuring channels, the calibration is performed in real time, and the system has better data credibility than the signal acquisition of a single channel; and the heat flow safety value is judged by setting the parameters, and the alarm is given when the heat flow safety value exceeds the safety value range, so that the heat flow safety value has good safety and stability.
4. According to the system for simulating and testing the transient temperature of the dry sliding friction pair interface, disclosed by the invention, the temperature is controlled through the closed box body, the heating wire heats and the cooling liquid refrigerates, and the system has higher simulation strictness and feasibility than an open working environment, so that the application range is greatly increased.
5. According to the system for simulating and testing the transient temperature of the dry sliding friction pair interface, disclosed by the invention, through the test thought of sampling and simulating separately, the accurate test of the transient temperature of the sliding friction contact interface of various friction materials in various fields is realized, compared with a mechanical embedded temperature test system, the system is more convenient for replacing a friction sample piece for repeated test, the volume is smaller, the structure is simpler, the processing is easier, and the cost can be saved to a great extent.
Drawings
FIG. 1 is a basic block diagram of a dry sliding friction pair interface transient temperature simulation and test system.
Fig. 2 is a logic diagram of a system implementation scheme according to the present invention.
FIG. 3 is a schematic diagram of the interface configuration of the upper computer of the system of the present invention.
Fig. 4 is a schematic diagram of the basic structure of the disk module of the present invention. The device comprises a 1-box cover, a 2-lower test piece, a 3-workbench, a 4-rotating shaft, a 5-upper test piece, 6-cooling liquid, 7-heating wires, 8-temperature sensors and 9-flexible clamps.
FIG. 5 is a diagram of a test piece on process according to the present invention, wherein: fig. 5a is a top view and fig. 5b is a front view. 5.1-friction layer, 5.2-base layer and 5.3-infrared temperature measuring probe.
FIG. 6 is a diagram of a test piece under process according to the present invention, wherein: fig. 6a is a top view and fig. 6b is a front view.
Detailed Description
The invention will be further described with reference to the drawings and examples.
Example 1:
As shown in fig. 1, the system for simulating and testing the transient temperature of the dry sliding friction pair interface disclosed in the embodiment mainly comprises a working condition simulation module and an infrared test module. The working condition simulation module comprises a controller, a motor, a compressor, a heater, an executing mechanism and a disk module; the infrared test module comprises an infrared temperature probe, a signal conditioning box, an NI acquisition card and an upper computer.
The working condition simulation module works by sending an instruction to the controller by the upper computer, and sending a control signal to the motor, the compressor or the heater by the controller according to different instructions. The executing mechanism is used for providing a relative rotation speed difference of 0-5000r/min for the disc module and a contact pressure of 0-8000N; the compressor and the heater are used for providing an environment temperature of minus 30 ℃ to 500 ℃ for the disk module, so that the interface friction working condition of the dry sliding friction pair is simulated.
The infrared test module works by transmitting temperature signals into a signal conditioning box through two paths of infrared temperature measuring probes arranged in a disk module, transmitting the temperature signals to an NI acquisition card with 16-bit 8-channel sampling rate of 80MS/s after filtering, signal amplification and A/D conversion signal conditioning links, and displaying and controlling the temperature signals through upper computer software written in Labview. Wherein the range of the infrared temperature measuring probe is-50 ℃ to 600 ℃, the precision is 0.3 percent, and the response speed is less than or equal to 5ms.
The working method of the dry sliding friction pair interface transient temperature simulation and infrared test system disclosed by the embodiment comprises the following steps:
Step one: setting parameters of an upper computer, including relative linear speed, ambient temperature, contact pressure, contact angle and sliding time of an object to be simulated;
Step two: the heat flow density of the complete conversion of the sliding friction work is obtained through calculation of an upper computer, whether the friction material is subjected to too strong damage is judged, namely, the rationality of parameter setting is verified, and if the rationality is unreasonable, the parameter setting link is repeated; in the second step, the excessively strong damage action means that the damage parameter exceeds a preset threshold value, and the threshold value is preferably a material safety threshold value in an upper computer software configuration database.
Step three: after the parameter setting is completed, a sliding starting instruction is sent out, a controller sends out a control signal, and meanwhile, a test module is started, and temperature data starts to be collected at a high speed and displayed in real time;
step four: sequentially judging whether the ambient temperature and the relative rotation speed of the disc module reach target set values or not, and if not, waiting until the target values are reached, and then pressurizing and engaging so as to start sliding friction;
Step five: judging whether the sliding time reaches the set target sliding time, and releasing pressure and separating after waiting until the sliding time reaches the target value, so as to stop the motor and the temperature control;
Step six: after a data storage instruction is sent, the upper computer stores collected data and provides a data playback function.
Step seven: and (3) realizing single dry sliding friction auxiliary interface transient temperature simulation and infrared test according to the steps from the first step to the sixth step.
Step eight: according to actual needs, the simulation and infrared test of the transient temperature of the dry sliding friction pair interface under different working conditions of corresponding times are carried out, so that the simulation and test of the transient temperature of the dry sliding friction pair interface applied to multiple fields are realized, and the transient temperature values of various dry sliding friction pair interfaces in production and life can be simulated with high precision.
The system can be applied to the simulation and test of the transient temperature of the dry sliding friction pair interface in multiple fields, and can simulate the transient temperature values of various dry sliding friction pair interfaces in production and life with high precision. The invention has the following advantages: by adopting a punching non-contact temperature measurement scheme, the error can be reduced to a great extent; the actual working condition can be reproduced in the simulation process, so that the simulated temperature value has higher credibility; the friction sample is convenient to replace, and is suitable for various fields and various friction materials; the structure is simple and convenient, only a small sample is required to be processed, and the cost can be saved to a great extent.
The upper computer software is written by Labview, has a simple modularized programming environment, and is convenient for later development. The interface mainly comprises a working condition simulation module, an infrared test module and basic keys. The working condition simulation module mainly completes the setting of relative linear speed, ambient temperature, contact pressure, contact angle, sliding time and the like, the setting ranges are 0-60m/s, 30-500 ℃,0-7500N,0-90 DEG and 0-24h in sequence, and the working condition safety indicator light prompts whether the simulation working condition is reasonable and safe; the infrared test module mainly completes the display of two paths of infrared temperature signals, and alarms when the difference of the two paths of temperature signals exceeds 5% of the average value, so that the sensor is prompted to have faults or the sliding plane has centering problems; basic keys include start swipe, data storage, data playback, emergency stop and exit from the system.
The dry sliding friction working condition simulation module mainly adopts disc-to-disc friction, namely a disc-disc module. The disc module mainly comprises a rotating shaft 4, a workbench 3, an upper test piece 5, a lower test piece 2, a box cover 1, a flexible clamp 9, a heating wire 7 and cooling liquid 6. The peripheral equipment comprises a motor, a rotating speed executing mechanism and a pressure executing mechanism. Connection relation: the motor in the peripheral equipment is connected with a rotating speed executing mechanism through a gear, the rotating speed executing mechanism is connected with a rotating shaft 4, the rotating shaft 4 is fixedly connected with a workbench 3, and a lower test piece 2 is fixed on the workbench 3; the pressure executing mechanism in the peripheral equipment is connected with the flexible clamp 9, the flexible clamp 9 is fixedly connected with the upper test piece 5, and the infrared temperature measuring probe 5.3 is embedded in the upper test piece 5; the case cover 1 on the outer sides of the upper test piece and the lower test piece is connected with the case body through fastening screws, the case body is fixedly connected with the equipment shell, heating wires 7 and cooling liquid 6 are distributed in the case body wall, and the heating wires 7 are separated from the cooling liquid 6 through a partition layer. The working method comprises the following steps: the motor drives the rotating shaft 4 and the workbench 3 to rotate, and the lower test piece 2 rotates along with the workbench 3; the upper test piece 5 is applied with a certain contact pressure by a pressure executing mechanism, and two paths of infrared temperature measuring probes 5.3 are arranged at the middle and outer diameter parts of the upper test piece 5 through holes to monitor the instant temperature of a contact interface in real time; the heating wire 7 is used for rapidly increasing the ambient temperature, the cooling liquid 6 connected with the compressor is used for reducing the ambient temperature, and the box cover 1 plays a role in heat preservation.
The upper test piece 5 and the lower test piece 2 are collectively called a friction sample, and as a further improvement, the basic structure of the friction sample is simpler, and the repeated processing is convenient. The upper test piece consists of a friction layer 5.1, a base layer 5.2 and two infrared temperature measuring probes 5.3. The friction layer 5.1 and the lower test piece 2 respectively correspond to friction pair materials to be simulated, and the friction layer 5.1 and the lower test piece 2 conduct contact friction. The infrared temperature measuring probe 5.3 is arranged at the middle outer diameter of the upper test piece through the through hole, and the detection point directly refers to the friction interface but does not contact the friction interface. The middle part of the upper test piece is provided with through holes for screw fixation and uniformly distributed threaded holes for flexible clamping, the middle part of the lower test piece is provided with through holes for screw fixation, and two sides of the lower test piece are provided with positioning holes.
By adopting a non-contact temperature measurement scheme, the range of the infrared temperature measurement probe 5.3 is-50-600 ℃, the precision is 0.3 percent, the response speed is less than or equal to 5MS, a through hole is formed to embed a friction upper test piece, a high-speed data acquisition and storage function with a 16-bit 8-channel sampling rate of 80MS/s is provided, the testing precision is high, the response speed is high, and the method has obvious advantages compared with the traditional contact temperature measurement scheme.
The upper computer software is written by Labview, and as an alternative, an upper computer interface written based on C/C# language can be adopted, so that the functions can be realized as well;
the number of the infrared temperature measuring channels is 2, and as an alternative, the design of all the channels with the number of more than or equal to 2 can also fulfill the aim of testing, and the infrared temperature measuring channels have the effects of checking signals and increasing data quantity.
While the foregoing is directed to embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Claims (9)
1. The dry sliding friction pair interface transient temperature simulation and infrared test system is characterized in that: the system consists of a working condition simulation module and an infrared test module; the working condition simulation module comprises a controller, a motor, a compressor, a heater, an executing mechanism and a disk module; the infrared testing module comprises an infrared temperature measuring probe (5.3), a signal conditioning box, an acquisition card and an upper computer;
The working condition simulation module works by sending an instruction to a controller by an upper computer, and sending a control signal to a motor, a compressor or a heater by the controller according to different instructions; the executing mechanism is used for providing a relative rotation speed difference of 0-5000r/min for the disc module and a contact pressure of 0-8000N; the compressor and the heater are used for providing an environment temperature of minus 30 ℃ to 500 ℃ for the disc module, so that the interface friction working condition of the dry sliding friction pair is simulated;
The infrared test module working method is that two paths of infrared temperature probes (5.3) arranged in the disk module transmit temperature signals into a signal conditioning box, and the temperature signals are transmitted to an acquisition card after being subjected to filtering, signal amplification and A/D conversion signal conditioning links, and are displayed and controlled by an upper computer;
The working method is that,
Step one: setting parameters of an upper computer, including relative linear speed, ambient temperature, contact pressure, contact angle and sliding time of an object to be simulated;
Step two: the heat flow density of the complete conversion of the sliding friction work is obtained through calculation of an upper computer, whether the friction material is subjected to too strong damage is judged, namely, the rationality of parameter setting is verified, and if the rationality is unreasonable, the parameter setting link is repeated;
In the second step, the excessively strong destructive action means that the destructive parameter exceeds a preset threshold value, and the threshold value upper computer software is provided with a material safety threshold value in a database;
Step three: after the parameter setting is completed, a sliding starting instruction is sent out, a controller sends out a control signal, and meanwhile, a test module is started, and temperature data starts to be collected at a high speed and displayed in real time;
step four: sequentially judging whether the ambient temperature and the relative rotation speed of the disc module reach target set values or not, and if not, waiting until the target values are reached, and then pressurizing and engaging so as to start sliding friction;
Step five: judging whether the sliding time reaches the set target sliding time, and releasing pressure and separating after waiting until the sliding time reaches the target value, so as to stop the motor and the temperature control;
step six: after a data storage instruction is sent, the upper computer stores collected data and provides a data playback function;
Step seven: according to the steps one to six, realizing single dry sliding friction auxiliary interface transient temperature simulation and infrared test;
Step eight: according to actual needs, the simulation and infrared test of the transient temperature of the dry sliding friction pair interface under different working conditions of corresponding times are carried out, so that the simulation and test of the transient temperature of the dry sliding friction pair interface applied to multiple fields are realized, and the transient temperature values of various dry sliding friction pair interfaces in production and life can be simulated with high precision.
2. The dry sliding friction pair interface transient temperature simulation and infrared test system of claim 1, wherein: the range of the infrared temperature measuring probe (5.3) is-50 ℃ to 600 ℃, the precision is better than 0.3%, and the response speed is less than or equal to 5ms.
3. A dry sliding friction pair interface transient temperature simulation and infrared test system as claimed in claim 1 or 2, wherein: the fields include vehicle friction drive and braking, rock and metal thermophysical property detection, conveyor belt product development, and temperature field analysis of various friction elements.
4. A dry sliding friction pair interface transient temperature simulation and infrared test system as set forth in claim 3, wherein: the upper computer software is written with a simple modularized programming environment, so that the later development is facilitated; the interface consists of a working condition simulation module, an infrared test module and basic keys; setting relative linear speed, ambient temperature, contact pressure, contact angle and sliding time is completed in the working condition simulation module, the setting ranges are respectively and sequentially corresponding to 0-60m/s, -30-500 ℃,0-7500N,0-90 and 0-24h, and the working condition safety indicator lamp prompts whether the simulation working condition is reasonable and safe; the infrared test module completes the display of two paths of infrared temperature signals, and alarms when the difference of the two paths of temperature signals exceeds a preset threshold value, so as to prompt the sensor to have a fault or the sliding plane to have a centering problem; basic keys include start swipe, data storage, data playback, emergency stop and exit from the system.
5. The system for simulating transient temperature and testing infrared of a dry sliding friction pair interface of claim 4, wherein: the dry sliding friction working condition simulation module adopts disc-to-disc friction, namely a disc module; the disc module consists of a rotating shaft (4), a workbench (3), an upper test piece (5), a lower test piece (2), a box cover (1), a flexible clamp (9), a heating wire (7) and cooling liquid (6); the peripheral equipment comprises a motor, a rotating speed executing mechanism and a pressure executing mechanism; connection relation: the motor in the peripheral equipment is connected with a rotating speed executing mechanism through a gear, the rotating speed executing mechanism is connected with a rotating shaft (4), the rotating shaft (4) is fixedly connected with a workbench (3), and an upper test piece (5) is fixed on the workbench (3); the pressure executing mechanism in the peripheral equipment is connected with the flexible clamp (9), the flexible clamp (9) is fixedly connected with the upper test piece (5), and the infrared temperature measuring probe (5.3) is embedded in the upper test piece (5); the box cover (1) at the outer sides of the upper test piece (2) and the lower test piece (2) are connected with the box body through fastening screws, the box body is fixedly connected with the equipment shell, heating wires (7) and cooling liquid (6) are distributed in the box body wall, and the heating wires are separated from the cooling liquid (6) through a separation layer; the disc module working method comprises the following steps: the motor drives the rotating shaft (4) and the workbench (3) to rotate, and the lower test piece (2) rotates along with the workbench (3); the upper test piece (5) is applied with a certain contact pressure by a pressure executing mechanism, and two paths of infrared temperature measuring probes (5.3) are arranged at the middle and outer diameter parts of the upper test piece (5) through holes, so that the instantaneous temperature of a contact interface is monitored in real time; the heating wire (7) is used for rapidly improving the ambient temperature, the cooling liquid (6) connected with the compressor is used for reducing the ambient temperature, and the box cover (1) plays a role in heat preservation.
6. The system for simulating transient temperature and infrared testing of a dry sliding friction pair interface of claim 5, wherein: the upper test piece (5) and the lower test piece (2) are collectively called a friction sample piece, and the upper test piece (5) consists of a friction layer (5.1), a base layer (5.2) and two infrared temperature measuring probes (5.3); the friction layer (5.1) and the lower test piece (2) respectively correspond to friction pair materials to be simulated, and the friction layer (5.1) and the lower test piece (2) are in contact friction; the infrared temperature measuring probe (5.3) is arranged at the middle outer diameter of the upper test piece (5) through the through hole, and the detection point directly refers to the friction interface but does not contact the friction interface; the middle part of the upper test piece (5) is provided with through holes for screw fixation and uniformly distributed threaded holes for flexible clamping, the middle part of the lower test piece (2) is provided with through holes for screw fixation, and two sides of the lower test piece are provided with positioning holes.
7. The dry friction sliding pair interface transient temperature simulation and infrared test system of claim 6, wherein: the rotating shaft (4) is in threaded connection with the workbench (3), the pressure executing mechanism is in threaded connection with the flexible clamp (9), and the rotating speed executing mechanism is in threaded connection with the rotating shaft (4); the box cover (1), the flexible clamp (9), the infrared temperature measuring probe (5.3), the workbench (3) and the rotating shaft (4) are standard components, and when single components are damaged, the box cover is continuously used through replacement.
8. The dry friction sliding pair interface transient temperature simulation and infrared test system of claim 7, wherein: the number of the infrared temperature measuring probes (5.3) is two, the two infrared temperature measuring probes are symmetrically distributed at 180 degrees, and one infrared temperature measuring probe is optionally used as a signal check; the thickness of the friction layer (5.1) of the upper test piece (5) can be flexibly adjusted, and the thickness is 5-8mm; the embedded depth of the infrared temperature measurement probe (5.3) is flexibly adjusted, and the distance between the top end of the selected probe and the contact interface is 10-15mm; the cooling liquid (6) is required to have stable characteristics, the cooling rate is high, and R290 is selected.
9. The dry sliding friction pair interface transient temperature simulation and infrared test system of claim 8, wherein: when the normal working condition of the dry clutch of the household car is simulated, the material of the friction layer (5.1) of the upper test piece (5) is paper-based powder metallurgy, the material of the lower test piece (2) is 65Mn steel, and the working condition parameters are relative linear speed 25m/s, ambient temperature 60 ℃, contact pressure 200N, contact angle 0 and sliding time 2s.
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| CN110779864B (en) * | 2019-12-04 | 2024-10-15 | 吉林大学 | Bionic microstructure friction and wear process information acquisition device |
| CN112611558B (en) * | 2020-12-31 | 2023-06-23 | 深圳技术大学 | Clutch working condition simulation device for friction testing machine |
| CN115127682A (en) * | 2022-07-11 | 2022-09-30 | 北京泽声科技有限公司 | Test circuit and test method of infrared sensing signal processing system |
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