Special Instructions for PX-20 Microcomputer Controlled Chain High Frequency Fatigue Testing Machine
1. The PX-20 chain fatigue testing machine is a fully digital high-frequency fatigue testing machine, and its excellent performance has been verified and recognized by many enterprises in the aerospace system for a long time. It is also a commonly used model in the aerospace system. The equipment indicators and functions fully meet the requirements of ASTM, ISO, GB and other standards or test methods, and fully meet the requirements of various levels of laboratory certification systems at home and abroad.
2. Use the "dynamic and static test force fluctuation" index to characterize the adaptive performance of digital servo controllers and digital power amplifiers in controlling high-frequency fatigue testing machines. This high-frequency fatigue testing machine adopts a "digital servo controller" and a "digital power amplifier", which is a truly fully digital high-frequency fatigue testing machine.
3. Implement a simulation test method for complex stress equivalent fatigue using the "modulation control fatigue test" method.
4. As the high-frequency fatigue testing machine operates based on the principle of resonance, the use of "phase frequency closed-loop control" for synchronous (i.e. same frequency and same phase) measurement and control is necessary to ensure the effectiveness of the entire testing process control. It will not deviate from the resonance point due to changes in the performance of the test piece during the testing process, and has strict frequency and phase following characteristics. The benefits it brings are easy vibration initiation, good stability, good resonance state, high loading capacity, and no stopping of vibration during the testing process.
1、 Purpose and Characteristics
The PX-20 chain fatigue high-frequency testing machine has the characteristics of simple structure, convenient operation, high efficiency, and low energy consumption among various types of fatigue testing machines. Therefore, it is widely used in national defense research, higher education institutions, and industrial production departments.
The PX-20 chain high-frequency fatigue testing machine is widely used to test the fatigue fracture resistance of various metal materials, test KIC values, S-N curves, and so on; Equipped with corresponding fixtures, it is widely used to test the fatigue life of various components (such as plates, gears, crankshafts, bolts, chains, connecting rods, compact stretching, etc.), and can complete a wide variety of fatigue tests including symmetric fatigue tests, asymmetric fatigue tests, unidirectional pulsation fatigue tests, block spectrum fatigue tests, modulation control fatigue tests, high and low temperature fatigue tests, three-point bending, four point bending, torsion, etc. At present, many higher education institutions and research departments, especially in the fields of automobiles, aviation, aerospace, petroleum, etc., use fully digital high-frequency fatigue testing machines for fracture toughness testing, testing the crack propagation rate and threshold value of metal materials. With the improvement of testing methods, its usage functions are constantly expanding.
2、 Brief description of equipment working principle
The PX-20 chain high-frequency fatigue testing machine has excellent performance in terms of control accuracy, stability, ease of operation, and reliability.
The PX-20 chain high-frequency fatigue testing machine computer measurement and control system is a fully digital phase frequency closed-loop control system, which strictly synchronizes control and dynamic force, enabling the system to always work at the resonance point, with low waveform distortion and stable operation. It will not stop vibrating during high-temperature fatigue testing and crack propagation rate testing. The fully digital phase frequency closed-loop control method is a prominent feature of the PX type measurement and control system.

Enhanced measurement and control software

Dynamic waveform display
The computer measurement and control software of PX-20 chain high-frequency fatigue testing machine adopts WIN2000/XP/NT operating system, and the application program adopts WMD (device driver program) mechanism, which runs quickly and can reliably and effectively control the equipment.
The latest released Windows 2000/XP/NT version (compatible with higher versions) measurement and control software has a simple and clear interface, intuitive and convenient operation, and can be mastered proficiently in just over ten minutes, bringing great convenience to operators.
3、 Basic conditions for equipment use
1. On site environmental conditions
Environmental temperature range: (-10~+45) ℃
Relative humidity of the environment: not exceeding 80%
Altitude: not exceeding 1000m
2. Other conditions
The laboratory should have a three-phase four wire 380V AC power supply and necessary power strips (sockets). The voltage fluctuation range of the power supply should not exceed ± 10%, and the allocated power of the power supply should not be less than 1.5 times the power of the equipment. The laboratory should have a reliable grounding wire.
The laboratory floor should be a solid and flat surface capable of carrying equipment, such as a flat cement floor, without the need for special foundations.
4、 Main technical specifications of PX-20 fully digital high-frequency fatigue machine

serial number	name	Model	quantity	Instructions
1	High frequency fatigue testing machine host	PX-20 type	1 unit
2	All digital measurement and control electrical box	PX-20 type	1 unit
3	High frequency fatigue testing machine high-voltage cabinet	PX-20 type	1 unit	Mainly includes: high-voltage distribution system and power amplifier.
4	Communication servo motor	RYC075C3-VVT2	1 unit	Reliability and lifespan superior to DC servo motors
5	Communication servo motor controller	GYG075CC2-T2E	1 unit	Due to the use of fully digital control, its stability and controllability are superior to DC servo motor controllers, with no zero drift.
6	High frequency fatigue machine specific load sensor	PX-20kN	1 unit	High frequency response, high precision, infinite lifespan high-frequency dedicated dynamic sensor. The spoke structure (non column or cylinder structure) has excellent anti eccentric load performance. Has excellent stability and accuracy.
7	Lenovo brand commercial computer	Mainstream configuration, 22 inch LCD display	1 unit	The mainstream configuration at the time of shipment, in order to ensure that the configuration is not outdated.
8	laser printer	Hp1007 A4	1 unit
9	PCI bus dedicated control card	PCI1	1 piece	Standard WDM driver for logic control. All components are imported.
10	PCI bus display card	CI2	1 piece	Standard WDM driver for dynamic waveform display. All components are imported.
11	High frequency fatigue test	V5.25	1 set	Enhanced version of conventional fatigue, program-controlled fatigue, modulation control measurement and control software with dynamic waveform (dynamic load waveform, excitation waveform, current waveform) display function; It has complete digital protection functions, etc. Windows XP/2000 and above platforms.
12	Sensor calibration fixture	PX-20	1 set	Including 1 positioning carrier disk and 1 loading head. Used for installing measuring instruments or conducting compression tests during measurement and inspection.
13	Coaxial verification specimen	standard form	1 piece	Specialized upper and lower coaxial installation positioning rods that are compatible with the equipment, for assembly and use.
14	Circular specimen fatigue test fixture	M22×1、M14×1	1 set each
15	random tool		1 set
16	random materials		1 set	1 software CD, 1 fixture and tooling drawing, 1 product qualification certificate, 1 packing list for use and maintenance instructions.

Other optional accessories

serial number	name	Model	Instructions
1	New type of board fixture	new-type	Can cross zero
2	Standard board fixture	standard form
3	three-point bending	standard form
4	Thin plate fixture	standard form
5	Four point bending	standard form
6	Twist fixture	standard form
7	Gear fixture	Double tooth standard type or single tooth type
8	Fastener Fixture Series
9	Chain clamp series
10	Automotive connecting rod fixture series
11	Reinforced steel bar fixture series
12	Lock fixture	Specialized type
13	Double tube high-temperature furnace	100～1100℃	Including 3 temperature measurement and control devices, 3 K-type thermocouples, furnace body rotating bracket, heat dissipation water jacket, etc.
14	Double tube high-temperature furnace	200～1200℃	Including 3 temperature measurement and control devices, 3 K or S-type thermocouples, furnace rotating bracket, heat dissipation water jacket, power cabinet, etc.
15	High and low temperature environmental chamber		Liquid nitrogen refrigeration type or refrigeration unit type.

6、 The main functions of PX-20 fatigue machine and the main differences in performance compared to other products
1. The PX-20 fatigue machine host has a novel and unique design, and is optimized using a multi degree of freedom mechanical model, resulting in better dynamic loading capacity, dynamic force error, and load fluctuation than foreign products.
2. The PX-10 fatigue machine has functions such as conventional fatigue testing, including constant dynamic and static load constant stress amplitude fatigue testing (symmetrical or asymmetrical), block spectrum (programmable) fatigue testing, and modulation control fatigue testing (sine wave, triangular wave, trapezoidal wave, custom wave).
A. Waveform diagrams of various stress states in conventional fatigue testing
Among them: green - symmetric fatigue test, red - tensile to tensile fatigue test,
White compression fatigue test, blue tension compression asymmetric fatigue test.

B. Waveform diagram of program-controlled fatigue test (a special case of square wave modulation fatigue test)

C. Modulation control fatigue test waveform diagram (the following only illustrates the situation of dynamic load modulation control, in fact, dynamic load
The load and average load can be modulated and controlled separately or simultaneously, resulting in numerous test functions

Waveform diagram of sine wave modulation fatigue test

Triangle wave (a special case of arbitrary line wave) modulation fatigue test waveform diagram

Modulation fatigue test waveform diagram of trapezoidal wave (a special case of arbitrary line wave)

Waveform diagram of fatigue test with arbitrary line wave modulation
3. Adopting a fully digital phase frequency closed-loop control system, the control is strictly synchronized with the dynamic force, and the effective sampling control frequency reaches 80kHz. Therefore, the system can always work at the resonance point between the specimen and the weight, with easy and convenient starting, low waveform distortion, stable and reliable operation, and does not stop vibrating with changes in the performance of the specimen itself during the test process, ensuring the fault free operation of the equipment. Simultaneously possessing good reliability and scalability.
4. The host adopts a dynamic and static load decoupling design in its structure, which makes the control of dynamic and static loads independent of each other and does not interfere with each other during operation; Adopting seamless double lead screws and dual guides to ensure the rigidity, parallelism, and coaxiality of the host; The equipment has a suitable operating height and is easy to clamp the test piece. During the experiment, the dynamic and static loads can be controlled separately or simultaneously, and the dynamic and static load settings can be freely adjusted manually. The system will automatically and accurately adjust to the new load value, with smooth loading, no overshoot, and no influence from factors such as temperature and cracks.
5. The PX fatigue machine has the largest coverage range (10kN~500kN). The 10kN high-frequency fatigue machine fills the gap of the smallest tonnage in China, while the 500kN high-frequency fatigue machine fills the gap of the largest tonnage in China.
6. When configuring the fatigue crack propagation rate testing device, it has the function of fatigue crack propagation rate testing.
7. When configuring static test attachments, it has the function of a static testing machine.
8. When configuring accessories for high or low temperature environmental testing, environmental simulation tests can be conducted on materials such as metals, including simulation tests under high temperature, low temperature, and alternating high and low temperature environments. It has the function of communicating with the temperature controller, and can set values and programming settings, real-time display, and timed recording of test temperature. When temperature protection or high-frequency machine protection is effective, it can be set to cool down and power off the high or low temperature environment test furnace.
9. It has relatively complete protection functions, such as overload protection, mechanical limit protection, motor overcurrent protection, fracture protection, exciter overcurrent secondary protection, frequency drop protection, manual setting protection for upper and lower limits of dynamic and static loads, and dynamic and static load loss protection. Many protections can be flexibly configured according to the requirements of different tests. The experimental process can be unmanned.
10. The computer uses WINDOWS as the working platform and adopts virtual panel and device driver (WDM) technology. The interface is clear, the operation is convenient, the program is standardized and robust, and the speed is fast. It completes the management and control of the entire device, such as real-time monitoring, real-time waveform display, processing and saving of data graphics, storage and printing of test reports, etc.
Instructions:
a. Real time waveform display: refer to the waveform display panel earlier. The real-time displayed waveforms include dynamic load waveform, current waveform, and excitation waveform, which are mainly used for self diagnosis of resonance state. This is extremely important for the operator, as it reflects the resonance state of the entire system, including the host, control, especially the fixture (mainly the specimen clamping), and the specimen itself, bringing great convenience to the operation.
b. Automatic storage of experimental process data: refer to the storage settings panel. The storage methods include equal time intervals and equal cycle times intervals, which can record the entire process of test data, test status, and the time of each test and status occurrence, and automatically store them on the computer hard drive to prevent data loss due to power outages. For intermittent fatigue testing, the test process data can be automatically continued to maintain the integrity of the test process data. Process data can be printed as reports, and its format can also be converted into commonly used software document formats such as Word, Excel, etc.