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Metal Parts Manufacturing Process
Jul 04, 2017

             1. Automotive engine connecting rod structure characteristics and its main technical requirements: The connecting rod is one of the main power transmission parts in the automobile engine, and its head is connected with the piston by piston pin and the crankshaft connecting rod axle neck. The compressed gas mixture gas in the combustor of the cylinder expands rapidly after ignition and burns to the top of the piston with great pressure, and the connecting rod passes the force of the piston to the crankshaft, pushing the crankshaft to rotate. The connecting rod component consists of a connecting rod body, a connecting rod cap and a bolt and a nut. In the engine work process, the connecting rod must withstand the expansion gas alternating pressure and the inertia force function, the connecting rod must have the sufficient strength and the rigidity, but also should minimize the connecting rod own weight, reduces the inertia force. The cross-section of the rod body is I-I, from the big head to the small size gradually become smaller.Metal Parts Manufacturing

            2. Automobile engine connecting rod material and blank: The connecting rod in the work withstands the multi-directional alternating load the role, must have the very high intensity. Therefore, the link materials are generally used high-strength carbon steel and alloy steel, such as 45 steel, 65 steel, 40Cr, 40MnB and so on. Ductile iron and powder metallurgy materials have been used in recent years. An automobile engine connecting rod is made of 40MnB steel, which is formed by the die satin method, and the rod body and the rod cover are forged into one. For this integral forging blank, it is to be cut in later machining process. In order to ensure that the cut hole processing allowance is even, the connecting rod head Kong Oval. Relative to the split forging, the integral forging of the connecting rod blanks has the advantages of less material loss, less forging working hours and less die. The disadvantage is that the required forging equipment has great power and the existence of metal fiber is cut off.Metal Parts Manufacturing

           3. Welding is a processing method that joins two pieces of metal locally or at the same time heating and pressurizing. 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 the arc discharge at high temperatures. 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 Shan round) through the current heating and melting to firmly join. 2 pieces of body parts welding, the edge of every 50-100 Shan 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, 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 Parts Manufacturing