Electronic high-temperature creep fatigue testing machine

1. Product Introduction: The $r $n electronic high-temperature creep fatigue testing machine is mainly used to measure the phenomenon of slow plastic deformation of metal and alloy materials under long-term constant high temperature and constant stress, as well as the performance of specimens in fatigue state. Widely used in industries such as metallurgy, military, aerospace, and related quality inspection agencies. $r $n1.1 Construction conditions $r $n (1) Voltage: 380V/220V #177; 10%, three-phase five wire (zero and ground wires cannot be mixed). Frequency: 50Hz (fluctuation+0.5~-1.0). $r $n (2) Environmental conditions: Room temperature: 15 ℃~30 ℃; Humidity: Relative humidity below 80%.

1Product Introduction

Electronic high-temperature creep fatigue testing machinemainUsed to measure the phenomenon of slow plastic deformation of metal and alloy materials under long-term constant high temperature and constant stress, as well as the performance of specimens in fatigue state.Widely used in industries such as metallurgy, aerospace, and related quality inspection agencies.

1.1construction conditions

（1）Voltage:380V/220V±10%Three phase five wire (neutral and ground wires cannot be mixed). Frequency:50HZ(Fluctuations)+0.5～-1.0）.

（2）Environmental conditions: Room temperature:15℃～30℃； Humidity: Relative humidity below80%.

（3）In an environment without obvious electromagnetic field interference, no impact, no vibration, and no corrosive media around.

（4）Leave no less than around the testing machine0.7mThe space is clean, the working environment is tidy, and there is no dust.

（5）The levelness of the host seat and rack shall not exceed0.2‰.

3.Main technical indicators

4.testing machinestructural principle

The testing machine mainly consists of the testing machine mainframe, high-temperature pull rod and fixture, high-temperature electric furnace, temperature control measurement system, deformation measurement system, electrical system, computer control system, and testing software system.

The testing machine has a safety protection function that ensures the safety of the testing personnel. There is a main electrical switch, an emergency stop button, a safe and reliable upper and lower limit protection system, etc. The testing machine has a luminous buzzer alarm system. The safety alarm function includes various fault alarms such as temperature exceeding the upper and lower limits alarm, deformation exceeding the range alarm, and rod travel limit alarm, and has functions such as sample fracture and test end alarm.

4.1Testing machine mainframe

The mainframe of the testing machine adopts a floor standing design,The upper crossbeam is connected to the workbench with two columns, forming a portal high stiffness frame,Having sufficient rigidity, the deformation of the frame can be ignored when operating under high loads, ensuring that the testing machine does not deform during long-term use. At the same time, the host has sufficient operating space,Effective experimental width500mm，Convenient installation and use of standard force measuring instruments, temperature measuring thermocouples, and creep deformation measuring devices; The load sensor is placed underneath and installed below the high-temperature furnace,The use of temperature compensation technology has improved the stability and reliability of the long-term operation of the test machine.

There is an automatic coaxiality adjustment device between the upper and lower clamp rods of the testing machine to achieve excellent coaxiality of the upper and lower clamps. The universal self-adjusting device has low friction and will not cause vibration, overload, torque, or eccentricity to the sample during the adjustment process, making it highly stable and reliable. The use of coaxiality adjustment device ensures that the tensile specimen is in an ideal two force rod state, and the automatically aligned ball joint ensures that the coaxiality of the test force of the upper and lower clamps is less than8%.

The testing machine uses a digital controller to control a high-precision, high response frequency AC electromechanical servo system, coupled with a high-precision prestressed ball screwTo achieve automatic loading and unloading of the testing machine system, it has the characteristics of fast frequency response and high repeatability positioning accuracy.The loading system consists of communication servo motors, turbine worm reducers, high-precision ball screws, and loading actuators. The servo motor is connected to the input end of the worm gear reducer through a synchronous toothed belt, and the output end of the reducer is connected to a high-precision ball screw. The loading actuator is fixed on the nut of the ball screw, and an anti rotation mechanism is installed on the loading actuator, so that the loading actuator can only move up and down and cannot rotate, thereby achieving automatic loading and unloading of the testing machine system.

4.2high-temperature furnace

300℃～1200℃ three-stage independent heating furnace,Adopting a split type cylindrical furnace with a high-quality stainless steel shell,3The furnace wire is heated independently. The high-temperature furnace consists of an adjustable support arm system, a stainless steel high-temperature furnace body, furnace tubes, and heating elementsComposed of insulation cotton, electrodes, thermocouple connectors, etc. The high-temperature furnace is shown in the following figure:

The high-temperature furnace body is made of high-quality stainless steel processing, and an air barrier is set between the inner and outer shells,Internally, high-temperature resistant alumina material is used for the furnace tube, and insulation is filled between the furnace tube and the furnace wallUltra fine ceramic fiber cotton,Good insulation effect,Double layer insulation effectively reduces the temperature of the furnace shell, and the surface temperature of the furnace shell is ≤90℃. Heating furnace diameter85mmFacilitate heat conduction and ensure uniform furnace temperature. Using Cornell iron chromium aluminum resistance wire,Iron chromium aluminum resistance wire is embedded in the groove of the furnace tube,Strictly follow the design requirements of the resistance wire, wind and shape it, strictly control the quality, reduce the damage rate on the surface of the electric heating wire, and extend the service life of the electric heating wire. The working life of a resistance furnace is1200Continuous working time at a constant temperature within ℃ is greater than30000Hour.

To ensure uniform temperature in the effective working area of the furnace, a three-stage independent heating resistance furnace is adopted. Each heating wire is controlled by a temperature controller with a microcomputer digital regulator, which has automatic heating and temperature control functions, and the heating process is smooth.High temperature furnace test temperature:300℃～1200Three stage independent heating at ℃, effective soaking zone length: ≥150mm，Temperature fluctuations and temperature gradients within the uniform heat zone: fluctuation ±2℃, temperature gradient3℃. high-temperature furnaceInternally, high-temperature resistant alumina material is used for the furnace tube, with a gap between the furnace tube and the furnace wallfillUltra fine ceramic fiber cotton,Good insulation effect,heating rateNot less than per minute20℃（冷炉）.

Temperature measurement adoptsKType thermocouple, wire diameter φ0.8mmEach length shall not be less than900mmEquipped with a protective porcelain sleeve.

4.3High temperature rod and high temperature extensometer

The material of the furnace pull rod and fixture is high-temperature alloy materialK465For both the upper and lower levels2Segmented, heat-resistant stainless steel is used for the outer part of the furnace3Cr13material.The specifications of the fixture are as follows:

（1）￠5×25(gauge length), sample length74mm, connecting threadM12；

（2）￠10×100(gauge length), sample length185mm, connecting threadM16；

The material of the high-temperature extension rod is high-temperature alloyK465The material and the gauge length of the extensometer are fixed, and the specific configuration is as follows:

（1）￠5×25(gauge length), materialK465；

（1）￠10×100(gauge length), materialK465；

The deformation measurement adopts a pull-out deformation measurement system to measure the deformation within the gauge length of the sample. It consists of a cone sleeve, a snap ring, an extension rod, and a guiding mechanism. This structure is easy to operate and the extensometer can move freely through a tension spring. The long-term deformation measurement of the test is accurate, stable, and reliable. Deformation measurement is carried out using a grating ruler, which has high accuracy, no interference, and no drift in deformation during creep testing for a long time, with a measurement range of shape0-12mm,Measurement resolution0.0001mmError ≤±0.002mmThe testing machine has a dual channel deformation measurement system, and the deformation can be observed in real timeATheBThe deformation and average deformation of two channels can be automatically recorded according to the set methodATheBThe deformation and average deformation of two channels. The controller has a deformation sensor adjustment function, which allows for deformation beyond the pre-set deformation adjustment during creep testingWhen the value is reached, the controller emits an audible and visual alarm to remind the operator to adjust the deformation sensor. The adjustment does not affect the deformation measurement before and after, and the deformation value is automatically accumulated.

The schematic diagram of the structure is shown below.

4.4control systemservo controller

u Support multiple closed-loop control modules;

u A signal conditioning unit with three sensors (force, displacement, deformation);

u Secondary servo valve drive unit;

u Control module: capable of implementing closed-loop control function, capable of collecting signals for fully digital closed-loop control, closed-loop control frequency10kHz；

u Servo valve drive unit: Drive control of nozzle servo valve;

u Frequency range of waveform generator:0.001-100HzFrequency resolution:0.001Hz；

u Control waveforms: sine wave, triangular wave, square wave, sawtooth wave, half sine wave, half triangular wave, random wave, and external input waveform, etc;

u Control mode: force, displacement, and deformation closed-loop control, which can achieve smooth switching of any control mode;

u The system has sensor calibration and reset functions;

4.5betaware

The experimental software is intuitive and highly readable;

Program testing

Easy to learn programming software

Professional static test analysis software

4.5computer

Configure Dell computers with stable performance, capable of installing necessary software for testing and other data processing, file organization, and other related software. The configuration parameters are as follows:

u I5Processor;

u 8GMemory capacity;

u 2THard drive;

u 21.5Inch LCD display；

u Windows 10System.

5. Configuration Details