Extrusion The blank is subjected to three-direction uneven compressive stress in the closed cavity, and is extruded from the orifice or slit of the mold to reduce the cross-sectional area, and the processing method for forming the desired product is called extrusion. Classification extruded (1) According to the forming temperature, the extrusion is divided into…
Welding Process 1. Fusion welding: A method of locally heating and melting a surface of a connected object to a liquid and then cooling it into a unit. 2. Pressure welding: The physical effects of friction, diffusion and pressure are used to overcome the unevenness of the two joint surfaces, and the oxide film and…
Submerged Arc Welding Submerged arc welding is a method in which an arc is burned under the flux layer for welding, and electrical and mechanical devices are used to feed and move the arc. 1.Basic principle The welding arc is burned between the wire and the workpiece, and the arc heat melts the ends of…
Brazing 1.Advantage (1) The heating temperature is low, which has little influence on the microstructure and properties of the base metal and is easy to ensure the dimensional accuracy of the weldment. (2) It can realize the connection of dissimilar metals or alloys, metals and non-metals. (3) Some brazing methods can complete dozens or hundreds…
Casting Process 1. Selection principle of pouring position 1) The important working surface or working surface of the casting should be downward. If it is difficult to achieve downward, it should be placed on the side as far as possible. 2) The large plane of the casting should be as far as possible. 3) Most…
Sand Casting And Metal Casting Characteristics Sand casting has a wide range of applications and is suitable for almost all parts production. For some large, single or small batch castings, manual styling is the first choice. The machine shape can improve the molding speed and the dimensional accuracy and quality of the mold, and is…
Advantages And Disadvantages Of Pressure Casting The advantages of pressure casting are as follows: 1) High productivity, can be die-casted 50 to 150 times per hour, up to 500 times, which is convenient for automated and semi-automatic production. 2) The casting has high dimensional accuracy and smooth surface (CT6～9, Ra0.4～3.2 μm). 3) The castings are…
Low Pressure Casting And Investment Casting The advantages of low pressure casting are as follows: 1) The pouring pressure and speed are easy to adjust, and can adapt to different mold types; the filling type is stable, the flushing force to the mold is small, and the gas is easy to be excluded. 2) It…
Advantages And Disadvantages Of Centrifugal Casting Centrifugal casting is the main production method for cast iron pipes, cylinder liners, copper bushings and bimetal bearings. The maximum weight of castings can reach several tens of tons, and it can also produce heat-resistant steel roller and special steel seamless pipe blanks. Its advantages are as follows: 1)…
What Are The Design Elements Of The Mold? The structure of the blow molding, the casting mold and the thermoforming mold is relatively simple, and the structures of the compression molding die, the injection molding die and the transfer molding die are relatively complicated, and the parts constituting such a mold are also many. The…