Two Ultrasonic Flow Testing Devices of Hubei Metrology Institute Obtained National Utility Model Patent

[China Instrument Network Instrument R&D] Adding a patent member to the National Quality and Technical Basic Field will provide a stronger impetus for the development of the high-tech service industry in the measurement and testing service industry.

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Recently, the research team of the Flow Measurement Technology Research Laboratory and the Portable Environment Large Flow Gas Sampling and Calibration Device, named after Sang Xiaoming, a professional measurement expert of the Hubei Institute of Metrology and Measurement Technology, released a new achievement in the field of quality and technical basic research. The double differential pressure ultrasonic flow measuring device and the adjustable two-headed time difference ultrasonic flow measuring device successfully obtained national utility model patents.
As a utility model patent, solving the technical problems of inspection and inspection and the development of service-related industries is the first consideration. The Venturi Double Differential Pressure Ultrasonic Flow Measurement Device is designed with a dual differential pressure flowmeter, which extends the flow measurement range of the ultrasonic flowmeter by 30%. It will effectively solve the problem that the high flow rate gas sampler in the nuclear power field cannot be calibrated in the field due to the large flow range. The difficulties will meet the measurement requirements of some safety monitoring equipment in the nuclear power industry; at the same time, this device will also effectively solve the problem of the incompleteness of the stability check standards for gas flow standard equipment.
"Reducing the two-probe time-difference ultrasonic flow measuring device" by improving the structure of the ultrasonic flow measuring device will effectively reduce the pressure loss during the calibration process of soot and particulate matter sampler, improve the sensitivity of the sampler calibration, and provide the sampler for soot and particulate matter. Low pressure loss calibration provides research direction.
Inspection and testing technology Utility model patent research is an important technical support for testing and testing the development of the service industry. After obtaining two patents this time, the Hubei Provincial Metrology Institute has obtained three utility model patents for inspection and testing, and is applying for and preparing to apply for six invention patents and utility model patents. In the future, the Hubei Provincial Metrology Institute will accelerate the adjustment of metrology and testing technology services to the measurement and scientific research, focus on strengthening the competitiveness of metrology and testing technologies, and strive to achieve an overall improvement in the quality of inspection and inspection technology services, as well as the promotion of national quality technology and domestic inspections. Testing service industry development and make more contributions.
(Original Title: Hubei Province Measurement Institute Wins Two National Utility Model Patents)

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

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