one. Test machine specifications
Main Specifications:
1. The force sensor is a radial tension sensor with a precision of 0.05% FS. The relative accuracy of the system's force measurement within the range of 2% to 100% FS is as high as ±1%.
2. The displacement sensor adopts a 2000 track/circle optical encoder and adopts quadrupled technology to achieve a resolution of 2400 tracks/turn (resolution up to 0.01mm).
3, measurement and control system using SmartTest test machine monitoring and control system, the main indicators:
(1) Three analog input channels for force value and electronic extensometer measurement. The number of AD conversion codes is ±120,000 (without step measurement with a high-resolution AD converter is better than 4 steps).
(2) A 1:100 speed ratio digital output channel, stepless speed regulation within the range of 2 ~ 200mm/min with the control servo system.
(3) Three photoelectric coded input channels are used to measure large deformation and displacement measurements, using 4 times technology to improve measurement resolution.
two. Technical Parameters
(1) Maximum test force: 50KN
(2) Accuracy level: Level 1
(3) Structure: Portal frame structure, full spray treatment
(4) Permissible error limit for test force indication: within ±1% of indication value
(5) Load measurement range: 0.4% to 100% of full scale FS
(6) Force resolution: 1/300000 of the maximum test force
(7) Limit of displacement indication error: within ±1% of indication
(8) Minimum displacement resolution: 0.01mm
(9) Beam speed adjustment range: 0.01 to 500 mm/min
(10) Relative error of beam speed: within ±1% of the set value
(11) Effective stretching space: 650mm
(12) Effective test width: 400mm
(13) Host Dimensions: 795×490×1850mm
(14) The weight of the host: 400kg
(15) Power Supply: 220V, 50Hz, 1KW
(16) Software and user interface: software and interactive man-machine dialogue operation interface under WINDOWS operating environment
(17) The test process and measurement, display, analysis, and control are all completed by the microcomputer.
(18) After the sample is destroyed, the moving beam automatically stops moving (or automatically returns to the initial position)
(19) Program-controlled and mechanical two-level limit protection
(20) When the load exceeds the rated value of 3 to 5%, automatic shutdown
three. Measurement and Control System Introduction
(A) Circuit Introduction
SmartTest digital data acquisition and control acquisition card is based on the PCI interface of the computer built-in PCI test card, in line with the PCI2.1 specification. The card can be directly inserted into any of the PCI insertion slots of the PC. By simply connecting the cable directly to the testing machine, the PC can automatically measure and control the PC, and truly plug and measure. SmartTest universal test card integrates program-controlled amplification, A/D conversion, digital I/O, count and pulse width (PWM), square wave generation (SWP) and other functions. Its system structure is reliable and concise, and it has very good mutuality. Change sex.
(II) Technical performance
1 The whole system adopts digital design, which is safe, stable, reliable and with high precision
2 The whole system without any adjustable device, digital zero adjustment and automatic calibration of measurement and control parameters
3 The system integrates CPLD computing devices, with high-speed computing capabilities, real-time processing of digital signals
4 This system uses the PCI2.1 bus standard, easy to expand, easy to upgrade and "plug and play"
5 Programmable amplifiers for integrated precision instruments, automatic shifting, automatic zero detection
(III) Software Overview
Based on the WINDOWS operating platform, the software is simple to operate, powerful, human-machine dialogue structure. Adopts standard Windows XP style, easy to learn
1. The software adopts modular design, different test types are created, test control and data analysis have independent modules and are separated from the main program. Can adapt to multiple test types of test control and data processing
2. The test data can be added by the user. The number is not limited, and the test record can be created by the template method. It is convenient and quick.
3. Automatically complete the test process, determine the broken type, and automatically record and save the test data. All test data is saved in internationally-available XML format
4. Efficient test data management functions enable rapid query, loading and deletion of test data in a variety of ways
5. The end of the test system automatically analyzes, statistical test results, analysis methods can be set by the user
6. Flexible report editing function provides users with special report editing tools for graphic typesetting. It is easy to learn and can easily print test curves and related pictures and texts.
7. Users can delete test data as needed
8. Users can change the analysis method according to their needs. The data can be amended according to their own needs.
9. Dedicated database management library module
1. Simultaneously record the force-time, deformation-time, displacement-time test curves, can switch observations at any time, zoom in and out, move horizontally or vertically, real-time high-speed sampling
2, provides a variety of report printing interface, the user can edit any format report as needed
3, test data using standard database management, automatic preservation of all test data and curves
The test curve is displayed in real time during the test. After the test is completed, the test data, curve and test piece information of the test piece are displayed in this operation window.
(4) Some national standards or test methods for software integration
This set of control software has now integrated more than 100 kinds of national and non-metallic metal standards or test methods, to meet the needs of customers in various aspects of the test, the test report method can be customized and updated at any time according to customer needs, so that customers can bring It is extremely easy to use.
(five) data query window
Database queries can be performed on historical test data. Simply enter certain conditions and the test data can be found immediately.
(6) Automatic Calibration Window
The force value and deformation can be automatically calibrated. After the debugging is completed, if the user feels that the value of the indication is inaccurate or the measurement and control parameters are changed, just click the automatic calibration button and the system parameters will be restored to the state at the time of debugging.
(7) Zero adjustment of the system adopts digital design
The two acquisition channels can be zeroed by simply operating the mouse, and the system can generally be zeroed once. In normal use, the system will automatically return to the true zero point.
(8) Batch data processing and batch report print window
A batch of similar specimens can be analyzed and analyzed, and the measurement and control data can be compared and the average value can be calculated. The specimens can be collectively printed in batches. We can customize special test reports for our customers. These are just a few representatives of various forms. The test report can also be edited and printed according to user requirements and has associated processing software (batch processing, control programmer, MaxDoc report processor, MaxXls report processor, etc.)
Tungsten Carbide Roller
Tungsten carbide roller has characteristics of good wear resistance, high temperature red hardness, thermal fatigue resistance and thermal conductivity and high strength , have been widely used in high-speed wire rod, bar, rebar, seamless steel tubes, etc. Domestic production of tungsten carbide roller materials mostly WC- Co, WC- Co- Ni- Cr two series, and the content of Co, Co- Ni - Cr is in the range of 6wt% ~ 30wt%. From the use of perspective, tungsten carbide rollers has good mechanical properties, its flexural strength up to 2200 MPa or more, shock toughness up (4 ~ 6) × 10^6 J/ m^2, Rockwell hardness (HRA) is up to 78 to 90, widely in the high-speed wire rod rolling process, which is much higher than single-slot chilled cast steel or high speed steel rolls.Tungsten carbide is made of Tungsten Carbide Powder and binder phase (such as drilling, nickel, etc.), and then pressing and sintering, regardless of the conditions under cold rolled or hot rolled has excellent wear resistance, tungsten carbide rollers has been widely used in pre-finishing mill and finishing of high-speed wire rod currently. On the performance of tungsten carbide roller in hot-rolling wire rod , the material must meet the following requirements:
1. Sufficient anti-fracture strength;
2. Good abrasion resistance;
3. The smooth surface finish;
4. Excellent corrosion resistance, thermal fatigue, thermal cracking performance.
Tungsten carbide roller rings can working in bad conditions , small profile rolling (especially rebar rolling) process conditions is harsher than the high-speed wire rod, and therefore corresponds to the profile rolling ,tungsten carbide rollers recommend using high binder phase carbide.
Tungsten carbide roller material design
Pre-finishing all vehicles roller should ensure its high toughness, strength, rigidity and thermal conductivity, followed before considering its wear resistance. When designing each vehicles roller, pre-finishing materials should choose carbide grades of Co, Co- Ni- Cr binder content is high (greater than or equal to 25wt%) , requiring an average WC grain size of coarse (5μm ~ 6μm), to obtain a higher shock toughness, proper strength and hardness. For the finishing of the roller movements, particularly the last two rollers of the finish rolling, which suffered load is small, and high relative velocity of the material to be pressed (80 m / min ~ 120 m / min). In this case, the wear resistance of the roller to be the most important requirements, and must ensure the strength , timpact toughness and hardness of a reasonable match, so the binder of Co / Ni content ratio and the average grain WC control of particle size and other factors must have greater control in front of different pre-finishing rolling roll.
Tungsten carbide roller category
According to the structure of tungsten carbide rollers, it can be divided into solid tungsten carbide roller and composite tungsten carbide roller. Solid tungsten carbide rollers have been widely used in pre-finishing and finishing stands high speed wire rod mill (including fixed reducing the rack, pinch roller rack). Composite tungsten carbide roller is made of cemented carbide and other materials, and it can be divided into tungsten carbide composite roll rings and solid tungsten carbide composite roller. Tungsten carbide composite roll rings mounted on the roller shaft; solid tungsten carbide composite roller will be directly cast in the roll axis to form a whole, a large load is applied to the rolling mill.
Tungsten carbide roller production process control
Tungsten carbide rollers produced by powder metallurgy method, the key to its process control is the chemical composition of the material and the mixture was prepared, pressed molding, sintering and deep processing and other preparation process parameters.
1. Preparation of starting material (WC focus quality): As the WC raw material and quality control of the use of different levels of quality may fluctuate, resulting in adverse effects on microstructure.
2. Preparation of the mixture: Mixture preparation is the key to the production process of the roller, the roller of failure modes - trachoma, mainly generated by this procedure.
3. Pressing: roller pressing is an important process of the roller mill.
4. Sintering: roller sintering is to determine the final quality of the roller production processes, use of advanced low-pressure sintering technology, HIP sintering technology can greatly improve the performance of roller.
5. Deep processing: deep processing rollers have a greater impact on the quality and accuracy of the roller surface.
Carbide Roller,Carbide Ring,Mill of Rolling Line,Steel Wire Rod,Mill Rolling Finish Stand,Mill Roller Groove Type
Luoyang Golden Egret Geotools Co., Ltd , https://www.xtcthermalspray.com