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introduction： Welding method using electron beam as heat source。As shown in the figure Schematic diagram of electron beam welding As indicated﹐Hot cathode(Or filament)Emitted electron﹐Accelerated by a high voltage electrostatic field in a vacuum﹐The success rate of electromagnetic field aggregation generated by magnetic lens is high1.5×105watts/centimetre2Electron beam of(Beam diameter is0.25～1millimeter)﹐Bombarding the surface of the workpiece﹐The released kinetic energy is converted into heat energy﹐Molten metal﹐Create deep and narrow welds(deep/Wide ratio up to10﹕1～30﹕1)﹐The welding speed can reach125～200meter/when﹐The heat affected zone of the workpiece
2015-03-19 Reading quantity 2793
introduction： At the customs，The commodity number is the same as the tariff number，Customs administration is carried out with this number The customs tariff code is summarized as follows： Metalworking machine tool：Host involvement81A tariff code，from84561000-84639000。 Which gold cutting machine56Kind of： 8456For special processing machine tools，A total of7Kind of tariff code； 8457For machining centers and groups and machine tool classes，A total of6Kind of tariff code； 8458lathe，A total of4Kind of tariff code； 8459Drill for、boring、Milling machines，A total of14Kind of tariff code； 8460It is a grinding machine，A total of16Kind of tariff code
2015-03-19 Reading quantity 2892
introduction： A component that provides a timed ration of high pressure fuel to the injector。It is the main component of diesel engine injection system。Commonly used in diesel engines are plunger type fuel injection pump and distribution type fuel injection pump。Plunger fuel injection pump has good performance﹐Reliable use﹐It has been widely used。Distribution fuel injection pump Yes20century50A new type of fuel injection pump appeared in the late 1990s﹐It has the advantage of being light﹑Low cost﹑Easy to use。 Plunger fuel injection pump figure Plunger type fuel injection pump pumping principle It is the pumping principle of plunger type fuel injection pump。A chute or spiral groove is milled on the cylindrical surface of the plunger﹐The inner cavity of the groove is connected with the pump cavity above the plunger
2015-03-19 Reading quantity 2791
introduction： The technology of organizing and managing the production and operation activities of industrial enterprises by applying the ideas and methods of systems engineering。Enterprise systems by people﹑fund﹑equipment﹑Raw material﹑Task and information are composed of six elements﹐They all have to meet certain constraints。To carry out management, we must first understand their constraints﹐Thus, the optimal operation of the system can be obtained dynamically under the restrictive conditions。Constraints fall into two categories﹐One is the restriction of economic law﹐One is the restriction of technical conditions。The global maximum is obtained under the condition of constraint
2015-03-19 Reading quantity 2790
introduction： one．Nuclear power valve development status Nuclear power valve is a large quantity and wide range of water pressure equipment in nuclear power plant，Its connected to the entire nuclear power plant300Complementary system，It is a key accessory for the safe operation of nuclear power plants。According to relevant statistics，Existing nuclear power units in the world500reseat，Total installed capacity of up to4Hundred millionKWabove，The main reactor types are pressurized water reactors（PWR）、Boiling-water reactor（BWR）、Graphite pile（LGR）、Fast reactor（FBR）、High temperature gas cooled reactor（HTGR）、Heavy water reactor（PHWR）。among，Pressurized water reactor (PWR) accounts for the entire stack type50%above。
2015-03-19 Reading quantity 2884
introduction：1.Whether the outer packing is clear In general，The factory brands have their own specialized designers for external packaging design，And arrange the production of factories with satisfactory production conditions，Therefore, the packaging is very clear from lines to color blocks，In no uncertain terms。 2.Whether the steel seal is clear inFAGImported bearing[Imported bearing:Simply put, the import bearing agent refers to the sale of an imported bearing brand。The main brands of imported bearings arenskbearing，ikobearing，fagbearing，Of good quality，Of course, the price is not cheap。]The brand will be printed on the body、Label etc。Very small font，but
2015-03-19 Reading quantity 1438
introduction：Discussion on different speed regulation modes of decelerating motor City-state gear motor is mostly induction motor，In the field of motor and drive, the speed control has been studied。The city-state usually uses a brake to adjust it，In the industry, there is usually a pole change speed、Variable frequency speed regulation、Ac voltage regulation speed regulation and speed regulation with hydraulic coupler and other different ways。And each high-speed mode has its own characteristics。We should consider the advantages and disadvantages of different speed control methods on the basis of the principle of deceleration motor。 one：Principle of gear motor： The reducer motor is composed of a reducer and an induction motor，Reducer principle：Different utilization
2015-03-19 Reading quantity 2893
introduction：one、Blanking process The blanking deformation process can be divided into three stages：The first stage：Elastic deformation stage(figure2onela) figure2-1 Blanking deformation process After the punch makes contact with the material，First flatten the material，Then punch and die cutting edge pressed into the material，Due to bending momentMThe role of，The material not only produces elastic compression but also slightly bends，As the punch continues to press in，The stress on the cutting edge of the material gradually increases，untilhDepth time，The internal stress of the material reaches the elastic limit，This is the elastic deformation stage of the material。
2015-03-19 Reading quantity 2778
introduction： Causes of viscous bending in the mold: 1、Insufficient mold rigidity;2、Bulge due to injection pressure of the mold expansion. The cavity expands somewhat due to the injection pressure，If it is restored in the mold，However, in fact, the pressure in the mold remains high to cool and cure the product，When the mold is restored to its original state, a great force is exerted on the mold，Makes the mold have to open a little bit。 solution： immediately：Manage the exit pressure，Do not rise above the value that should be set。 perennial：Settings
2015-03-19 Reading quantity 2839
introduction： Through bearing[bearing:bearing（“Bearing”，Japanese person“Axial receptor”）It is a part that holds and reduces the friction coefficient of load during mechanical transmission。Can also be said，When other parts move relative to each other on the shaft，A device used to reduce the coefficient of friction during power transmission and to keep the center of the shaft fixed。]Failure and deterioration，Performance state parameters to judge and predict bearing reliability and performance，On the part of the anomaly，Cause and risk level to identify and judge，Comprehensive techniques that determine repair and improvement methods。therefore，Bearing fault diagnosis technology is not simple
2015-03-19 Reading quantity 1441
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