Study on Strengthening and Toughening Process of V-2.49 Air Compressor Valve
Features.
The use of large-scale machines should be based on the economy and ensure the safety of transportation, optimize the combination and maximize the effect. In the process of application, establish a sense of quality, highlight the advantages of science and technology, and use it scientifically and rationally. Strengthen cooperation with relevant departments during construction to adapt to the transportation production system. It is necessary to discuss the technical problems in the application of solving the influence of the position of the contact pole on the construction.
The repair of the large machine should focus on the repair, build the repair frame at all levels for the overhaul state, and fully consider the matching of repair and maintenance capabilities. The overhaul is mainly based on factory repair, supplemented by Beijing and Shanghai as the center to establish a north-south overhaul base, and form an interactive consortium. The factory repair solves most of the overhaul of the whole machine, and the overhaul base solves part of the overhaul of the whole machine, and mainly solves the overhaul of the interchange assembly. Each mechanical section is mainly based on state repair. Deep research should be carried out and promoted to improve the annual repair. Should be done and repaired.
Li Lixin, born in 1967, is an engineer in the Beijing Mechanical Section of the Beijing Railway Bureau and a major in road maintenance machinery.
Address: No. 4, Shagang Village, Xidaokou, Fengtai District, Beijing, China. Development of the 0-type 1 meter-meter diesel locomotive. Li Yongjie Beijing Seven Locomotive Works Technology Center developed the 00-type meter-rail diesel locomotive exported to Vietnam. It is a motorcycle in northern China. The industrial group Beijing Seven Locomotive Works Co., Ltd. is a hydraulic transmission locomotive developed for the railway transportation line of the Vietnam Mongol Coal Preparation Company. It is used for freight and shunting operations. It is a project for the factory to participate in international competitive bidding, and is equipped with Caterpillar 35088 EFI engine. 0208 hydraulic reversing gearbox, loading power 970, boundary.
The 01 type meter-rail diesel locomotive adopts the frame-bearing hood exterior structure; the entire upper part of the locomotive is placed on the two-axis bogie by a rolling friction side bearing, and the bogie is connected with the vehicle body by the traction rod mechanism; the upper part of the locomotive From the back end to the front end, it is the electric room cab power room cooling room auxiliary room.
The 01 type locomotive has the following technical features worthy of mentioning the import of 01, Ding 35, 88 EFI engine, small size, small weight, small start, quick operation, simple protection, complete measures, reliable low emissions. 2, transmission system optimization design, matching speed diesel engine, output universal joint shaft adopts Germany 83 series, boundary 54106 products, light weight transmission torque large performance stable and reliable. 3 adopts the shaft liquid transfer bogie, the axle gear box is connected by the universal joint shaft to transmit the power, and the universal joint shaft is horizontally distributed. This structure is currently the first in the domestic locomotive. 4 Optimized design of the driver's cab, using the standardized design results of the locomotive driver's cab issued by the Ministry of Railways Transportation Bureau; in order to ensure the clearance height of the driver's cab, the 5.0, 8028 power supply refrigeration air conditioner is installed outside the front wall of the driver's cab, consisting of two curved cylinders. The air duct realizes the circulation of hot and cold air in the driver's room. The air duct material is a honeycomb noise reduction and heat insulation board widely used in the aviation field, which effectively reduces the noise from the power room and the air conditioner, and ensures that the hot and cold air in the air duct does not heat with the outside air temperature. exchange.
In July 2003, the locomotive was towed and passed the test on the main line of Kunming River in Kunming. The test results showed that the diesel engine and the running department of the locomotive were not abnormal in the operation of the Kunhe line. The locomotive can pass through the tunnel of the Kunhe line. The minimum radius of the curve through the Kunhe line is only 87, which does not cause damage to the line.
The test shows that the performance indicators of the 01 type meter rail locomotive meet the design requirements; it can fully meet the requirements of the user pulling 00 tons of trucks on the slope of 9, and the locomotive speed is greater than 12kmh.
Li Yongjie, born in 1972, is an engineer of China North Locomotive Group Beijing Seven Locomotive Works and graduated from Dalian Railway Institute.
The gas valve plate is made of 313 martensitic stainless steel. The steel has high toughness and good corrosion resistance in the quenched and tempered state. The strength of such steel in the quenched and tempered state is mainly affected by steel. The state of carbide precipitation and digital control, so the study of the carbide precipitation rule of valve steel has an important meaning for controlling the quality of valve products and improving their toughness.
The rule of carbide precipitation in martensitic stainless steel under different heat treatment conditions, the factors such as the retention and cooling rate of austenitizing temperature in the temperature range of 3 were studied, and the precipitation and toughness of the martensite stainless steel were prevented. The resistance of phase slab beam boundary cleavage is the main way to improve the toughness of 313 martensitic stainless steel after quenching and tempering, and it is proposed that the secondary quenching and tempering process can obtain good strength and sex.
Through the process research, it is concluded that the carbides precipitated along the crystal can be precipitated after austenitizing at a temperature lower than a certain critical cooling, or can be precipitated during the tempering after quenching, and the experiment shows that the austenite is too cold. The critical cooling rate of precipitated carbide is about 3035, 1.
The higher the austenitizing temperature, the residence or slow cooling in the 13 temperature range increases the tendency of carbides to crystallize along the crystal. The more the fraction of carbides deposited along the crystal and the distribution of the network, the greater the effect on the toughness.
When the carbide precipitated along the crystal is austenitized again, it must be dissolved at a higher temperature and a longer solution time, and cooled at a temperature greater than the critical cooling rate. The more precipitation fraction along the crystal carbide, the higher the solid solution time is. long.
The toughness of 313 martensitic stainless steel under quenching and tempering treatment is mainly controlled by carbide precipitation. By improving the quenching and tempering process, the distribution of carbides on the substrate can be significantly improved, thereby changing the physical process of fatigue fracture, preventing the occurrence of intergranular fracture and increasing the cleavage fracture stress along the slab boundary, thereby improving the toughness.
Art, its fatigue fracture life can be increased by 2 times.
The application of the toughening treatment in the production of the valve plate adopts the secondary quenching and tempering process. After the loading and unloading of two sets of 16 sets in the Nanchang Locomotive Depot of the Beijing Locomotive Depot of the Shijiazhuang Locomotive Depot, the 2.49 air compressor valve is used for type test. 300,000 kilometers without breaks. In May 2002, the 2.49 air compressors produced by our factory all used improved valve plates and equipment. There were about 200 air compressors of 2.49. The length of loading time was not the longest. The longest was nearly two years. , 2.49 User feedback of air compressor valve breakage.
Wu Dequan, male, 37 years old, deputy director of the technical department of Beijing Nankou Locomotive & Rolling Machinery Factory, senior engineer.
18-inch inverter main circuit drive and protection Tu Jianjun Lanzhou locomotive plant product development department circuit inverter, analysis of hybrid circuits, 8850 drive and over-current protection and snubber circuit over-voltage protection.
The overcurrent protection adopts the special drive mixed 1 circuit protection module designed with 103 Ding and the corresponding inverter to design the inverter. The overcurrent protection during short circuit is parameterized according to the analog through short circuit condition, so that the short circuit time before the device is not damaged Turn off to protect the device. To limit the dynamic trajectory to the æ‹™30 area, it is reasonable to use slow turn-off; when the drive protection function is activated, the output trigger voltage 1 is pulled down from +15 to +10, and the short-circuit time that can be withstood by 8 â–¡ In the above protection process, 0 gradually decreases from + 15 to ten 10, and maintains the period of time, because the immediate closing end 103 will cause the voltage to rise sharply. If it is too fast, it will cause 106 damage or mis-conduction.
Overvoltage protection design buffer is the best solution, buffering
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