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introduction： A sensor that measures temperature based on thermoelectric effects﹐It is a commonly used temperature measuring component in temperature measuring instruments。Make conductors of different materialsA﹑BConnect to a closed loop(figure1a Schematic diagram of thermocouple )﹐One end of the contact point is called the measuring end﹐One end refers to the reference end。If the temperature between the measuring end and the reference end is equal to0 imparity﹐Then in the loopA﹑BA thermoelectric potential is generatedE AB(﹐0 )﹐This phenomenon is called the Seebeck effect﹐Immediate thermoelectric effect。E ABSize dependent conductorA﹑BThe material and the temperature at both ends and0 vary﹐This circuit is called a prototype thermocouple。In practical application(figure1b Principle of thermocouple
2015-02-03 Reading quantity 2847
introduction：Laser welding and arc welding are two commonly used methods for mold repair。 Argon arc welding Argon arc welding is a kind of arc welding，The burning arc between the continuously fed welding wire and the workpiece is used as the heat source，It is welded by the gas emitted from the torch nozzle to protect the arc。At present, argon arc welding is a common method，Suitable for most major metals，Carbon steel included、Alloy steel。Mig welding is suitable for stainless steel、aluminum、magnesium、copper、titanium、Zirconium and nickel alloys，Due to low price，It is widely used in mold repair welding，But the welding heat affected area is large、Defects such as large solder joints，At present, the laser has been gradually supplemented in the repair of precision molds
2015-02-03 Reading quantity 2899
introduction：Content summary:If we find an entity that doesnt conform，The system will notify the user，A tool to determine the problem of solid model is given，Users can usually be based onWebthe、familiarModelCHECKIn the interface，Automatic correction。ModelCHECKBy enabling users to build good models that can be reused in subsequent applications，To simplify the work of design team engineers。Promotes reuse of models as companies continue to increase their use in their design processPro/ENGINEERsoftware，Model reuse ModelCHECKYes
2015-02-03 Reading quantity 2814
introduction： It has sufficient strength at high temperatures、Certain oxidation resistance and corrosion resistance as well as long-term structural stability of the steel。Heat resistant steels include heat strength steels and oxidation resistant steels。 Thermal strength steel Steel with sufficient strength at high temperatures and a certain degree of oxidation resistance。Heat-strength steel is often used in the manufacture of steam turbines、Rotor and blade of a gas turbine、Boiler superheater、Bolts and springs that work at high temperatures。Commonly used thermal strength steels are pearlescent thermal strength steels、Martensite thermal strength steel and austenitic thermal strength steel, etc。 ① Pearlescent thermal steel：This kind of heat-strength steel contains few alloying elements,Its total content generally does not exceed3～5％。Most commonly used
2015-02-03 Reading quantity 2833
introduction： Group grade code Chemical composition（The surplus is copper）（Mass fraction）（）Aluminum, iron, manganese, nickel and other impurities≤Aluminium bronze5Aluminium bronze7Aluminium bronze9-2Aluminium bronze9-4Aluminium bronze10-3-1.5Aluminium bronze10-4-4Aluminium bronzeQAl5QAl7QAl9-2QAl9-4QAl10-3-1.5QAl10-4-44～66～88～108～109～119.5～112～42～43.3～5.51.5～2.61～23.5～5.51.61.61.71.70.750.8Beryllium bronze5Beryllium bronze2
2015-02-03 Reading quantity 2822
introduction：FAGbearing[FAGbearing:The main shaft bearing is made of a solid inner ring、Outer ring、The ball、And a single row angular contact ball bearing consisting of a cage assembly with a solid window cage。]There are four main methods of grease injection，Theyre the fat cup method、smudging、Grease gun method and centralized grease feeding method。 first：Fat cup method inFAGbearing[FAGbearing:The main shaft bearing is made of a solid inner ring、Outer ring、The ball、And a single row angular contact ball bearing consisting of a cage assembly with a solid window cage。]Open a small hole next to the fat cup，The oil in the cup is constantly replenishedFAGbearing[FAGbearing:Main shaft bearing
2015-02-03 Reading quantity 1547
introduction： The main contents of NC programming are：Analyze part drawings to determine the process、Numerical calculation、Write processor、Proofreading procedure and first piece trial cut。 The specific steps of programming are described below： 1.Analytical pattern、Determine the process Machining parts on CNC machine tools，The original data that the technician gets is the part drawing。According to part drawing，Can be on the shape of the part、Dimensional accuracy、Surface roughness、Work material、The blank types and heat treatment conditions were analyzed，Then select the machine tool、cutter，Determine the positioning clamping device、Processing method、Machining sequence and cutting
2015-02-03 Reading quantity 2910
introduction：CNC milling machine can mainly mill planes、Grooves and surfaces，It can also process complex cavities and bosses。CNC milling machine spindle mounted milling tool，Under process control，Install workpieces along the workbenchX、Y、ZThe direction of the three axes，By constantly changing the relative position between the milling tool and the workpiece，Machining the workpiece in accordance with the requirements of the drawing。Because the CNC milling machine configuration of the CNC system is different，The instructions used vary in definition and function，But the basic functions and programming methods are the same。1.The main function of CNC milling machine1）Point control function The point control of CNC milling machine is mainly used for workpiece
2015-02-03 Reading quantity 2819
introduction：jiejiaoxian Line of section line of section The intersection line between the plane and the surface of the spatial form。It is one of the contents of descriptive geometry research。When the surface of the space body is a curved surface，The intersecting line is a plane curve,When the surface of a space form is composed of several planes,The intersecting line is a polygon。After giving the relative positions of the plane and space shapes，It is easy to draw projections of plane and spatial forms from a polyhedral orthographic diagram，But the projection of their intersecting lines cant usually be drawn directly，It is usually necessary to use the auxiliary surface method to find the projection of several points on the intersecting line，However,
2015-02-03 Reading quantity 2812
introduction： The stamping process of making cup-shaped parts with flat slab﹐Also known as drawing。Cylindrical shape can be made by deep drawing﹑spherical﹑cone﹑box-shaped﹑stepped﹑Hollow parts with flanges and other complex shapes。Drawing and flanging are used﹑bulging﹑flaring﹑Shrinkage and other process combinations﹐It can be made into stamping parts with more complex shapes。Automobile body﹑Fuel tank﹑The basin﹑Cups and boiler seals are drawn。Drawing equipment is mainly mechanical press。figure1 Drawing schematic diagram For the principle of drawing。In cylinder
2015-02-03 Reading quantity 2823
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