Automotive Mould Widely Used Forging Machining Methods

Casting is to pour molten metal into the mold cavity, cooling and solidification to obtain product production methods. In the process of automobile manufacturing,Automotive Mould the use of cast iron made of rough parts, about 10% of the total weight of the vehicle, such as cylinder body, gearbox box, steering gear shell, rear axle housing, brake drum, various brackets. Cast iron castings are usually made of sand type. Sand-type raw materials to sand, and with the binder, water and other mixed. Sand-type materials must have a certain bonding strength in order to be molded into the desired shape and can withstand high temperature molten iron to wash without collapsing. In order to be molded into an empty cavity that conforms to the shape of the casting,Automotive Mould it must first be made into a wood model called Bakelite. Hot molten iron after cooling the volume will be reduced, therefore, the size of the Bakelite need to be in the original size of the casting on the basis of shrinkage, the need for cutting the surface of the corresponding thickening. Hollow castings need to be made into sand cores and corresponding core bakelite (core box). With a wooden mold, you can turn the cavity sand type (casting also known as "Foundry"). In the manufacture of sand, to consider how to separate the upper and lower sand box to remove the wood mold, but also to consider where molten iron from the inflow, how to fill the empty cavity in order to get high-quality castings. After the sand form is made, it can be poured into the hollow cavity of the sand type. When pouring, the molten iron temperature is 1250-1350 degrees and the temperature is higher when smelting.

In the process of automobile manufacturing, the forging machining method is widely used. Forging is divided into free forging and model forging. Free forging is the process of forming a metal billet on an anvil under impact or pressure (known as "Iron"). The blanks of the gears and shafts of automobiles are machined with free forging methods. The model forging is a machining method which is formed by placing the metal billet in the mold chamber of the forging die and withstanding the impact or pressure. The model forging is a bit like a process in which dough is pressed into a cookie shape in the mold. Compared with the forging die forging,Automotive Mould the workpiece is more complex in shape and more precise in size. Typical examples of automobile die forgings are: engine connecting rod and crankshaft, automobile front axle, steering knuckle and so on.

Cold stamping or sheet metal stamping is a processing method for cutting off or forming the metallic sheet material under pressure in the die. Daily necessities, women's mouth aluminum pot, lunch box, washbasin and so on is the use of cold stamping processing methods made. For example, to make a lunch box, you first need to cut out a rectangle with 4 rounded blanks (known as "blanking"), and then use the convex die to press the blank into the concave die (the expert is called "deep drawing"). In the drawing process, the flat sheet becomes a box-shaped, its 4-side vertical bending, 4 of the corners of the material to produce a heap of poly and can see wrinkles. Automotive parts with cold stamping are: engine oil pan, brake floor, car frame and most body parts. These parts are usually formed by blanking, punching, drawing, bending, flanging, trimming and other processes. In order to manufacture cold stamping parts, die must be prepared. The die is usually divided into 2 pieces,Automotive Mould one of which is mounted above the pressure bed and can be slid up and down, and the other piece is mounted under the pressure bed and fixed. Production, the billet on the 2 die, when the upper and lower die closure, stamping process is completed. The stamping process has high productivity and can produce parts with complex shapes and high precision.

Welding is a machining method that joins two pieces of metal locally or simultaneously heated and pressurized. Our common workers have masks in one hand, and the other in the other hand, the welding method of the electrode and the electrode connected with the wire is called Manual arc welding, which is used to weld the electrodes and welding parts produced by arc discharge at high temperature. Manual arc welding is not used much in automobile manufacture. The most widely used in automobile body manufacturing is spot welding. Spot welding is suitable for welding thin steel plate, the operation, 2 electrodes to 2 pieces of steel plate plus pressure so that the bonding point (diameter of 5-6 甽 round) through the current heating and melting to firmly join. 2 pieces of body parts welding, the edge of every 50-100 甽 welding a point, so that 20 pieces of a discontinuous multiple-point connection. Welding the entire car body, usually requires thousands of solder joints. The strength of the solder joints is very high, each solder joint can withstand the tensile force of 5kN, even tearing the steel plate,Automotive Mould still can not separate solder joints. The common gas welding in the repair workshop is a method of melting and bonding the electrodes and welding pieces with the combustion of acetylene and the burning of oxygen to produce high temperature flames. You can also use this high-temperature flame to cut the metal, known as gas cutting. Gas welding and air cutting application is more flexible, but the heat-affected zone of welding is larger, which makes the deformation and microstructure change and the performance decreases. Therefore, gas welding is rarely used in automobile manufacturing.

Metal cutting process is to use the cutting tool to cut the metal blank layers, so that the workpiece to obtain the required shape, size and surface roughness machining methods. Metal cutting includes fitter and mechanical processing--fitter is a manual tool for cutting machining methods, flexible and convenient operation, widely used in assembly and repair. Machining is the use of machine tools to complete the cutting, including: car, planing, milling, drilling and grinding methods.

1) Turning: Turning is the process of machining the workpiece with a lathe knife. The lathe is suitable for cutting all kinds of rotating surface, such as inner, outer cylinder or cone surface, and can turn the end face. Many axle parts and gear blanks of automobiles are machined on lathes.

2 planing: Planing is the process of machining workpiece with planer. Planer is suitable for machining horizontal plane, vertical surface, incline and groove, etc. The cylinder body of the automobile and the head of the cylinder and the plane of the transmission box and cover are all machined with a planer.

3 Milling: Milling is the process of machining workpieces with milling cutters on milling machines. Milling machine can be used to process the bevel, groove, and even machining gears and surfaces of the old milling widely applied to the processing of various automotive parts. The die of the cold stamping of the automobile body is processed by milling. Computer-controlled milling machine can process the shape of a very complex workpiece, is the modern machining of the main machine.

4 Drilling and boring: drilling and boring are the main cutting methods of machining holes.

5 Grinding: Grinding is the process of machining workpieces with grinding wheels on a grinder. Grinding is a kind of finishing method, can obtain high-precision and roughness of the workpiece, but also can grind high hardness of the workpiece. Some of the auto parts after heat treatment are machined by grinding machines.