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In order to reduce the welding deformation, a reasonable welding process has been established, and strict process measures are adopted to ensure that the welding deformation is within a reasonable range. Welding method: using small wire energy welding, short arc narrow bead, segment welding, multi-layer welding to reduce the welding heat affected zone, refine the grain and improve the mechanical properties of the weld. Interlayer temperature: This prevents grain coarsening and reduces the tendency of hot cracks to occur. Measures to prevent or reduce welding deformation: Fixed plate steel is used to reduce the amount of deformation.
Welding procedure of the front (rear) disc of the fan impeller Before welding: The welding rod needs to be baked (baked) and placed in the incubator for use. The inner ring and the outer ring of the front (rear) disc are machined to open the groove. Before the welding, the oil, rust and scale in the weld bevel and around the weld are cleaned by the angle-polished grinding wheel, and the rust is sprayed in time. Agent. Place the inner and outer rings of the front (rear) plate horizontally on the workbench. Installed, fixed by spot welding with a fixed plate, and fully welded to the fixed plate after inspection. To ensure the interlayer temperature layer, a thermocouple thermometer is used to control the temperature. Select DC manual arc welding machine and tungsten argon arc welding equipment. The welding of the front (rear) disc is welded to the opposite side of the fixed plate by welding, and then the surface of the fixed plate is welded by manual arc welding after the surface is welded to the height of the welding. Turn over to weld the opposite side of the fixed plate. Note: Double cross welding must be used when welding
And the latter welding is opposite to the previous welding direction. After each welding, the welding slag should be tapped after the welding slag. If there is splash, it should be ground and then welded. The amount of deformation should be observed for each layer of welding, and the amount of welding deformation can be adjusted at any time by the welding order. The layerwise temperature should be measured at any time during the welding process, and if necessary, the welding should be stopped to prevent coarsening of the grains and reduce the tendency of hot cracking. The fixed plate can be removed after the stress relief heat treatment. Post-weld heat treatment: Stress-relieving treatment is carried out immediately after welding. During heat treatment, the sensitive temperature at which temper brittleness is generated should be avoided.
The welding of the welding blade and the front (rear) disk of the cover blade and the front (rear) disk is mainly impossible to be welded after all the spot welding, and only the blade and the front plate are welded first and then welded to the rear plate.
The welding of the blade and the front plate is heated by one side, which causes the front plate to deform greatly, which affects the dimensional accuracy. Therefore, the welding process can be strictly controlled to minimize the amount of deformation. The following measures can be taken to weld the reverse deformation process ring on the front plate when the blade is welded to the front plate, and the rigidity is fixed and reversely deformed. In the welding process, the small specification welding parameters are used as much as possible, and the double cross welding is adopted in the order. The welding of the impeller is strictly carried out according to the above process, the welding quality is ensured and the welding deformation is controlled within the required range. The use of low-matching high-toughness welding rods is very effective in reducing the tendency of cracks for high-torque rotating parts. It is necessary to rigidly fix and post-weld stress-relieving heat treatment to reduce deformation and reduce stress concentration.
The process of changing the front (rear) disk of the impeller from the forging to the two-body ring welding is very important for increasing the market competitiveness of the drum fan product because of the reduction of manufacturing cost.
The other end is connected to the pressing rod through the bearing, the shaft and the sliding groove, and the bearing on the connecting rod reciprocates in the sliding groove to drive the pressing rod to reciprocate. The connecting rod is subjected to bending moment, tension and pressure at the same time. Therefore, its strength and stiffness should be considered.
Moreover, during the motion conversion process, it is easy to generate vibration due to imbalance, or "catch up". Therefore, the parallelism of the bearing blocks at both ends and the perpendicularity to the same end face are to be ensured. Quenching and tempering should be carried out before finishing.
The presser palm presses the palm directly on the catalyst material and is connected to the end of the binder bar. Through the movement of the pressure bar, the palm is moved up and down to press the material downwards, so that the material can be smoothly transported forward without turning back. Because it is in direct contact with the material, it should use materials with good corrosion resistance. The automatic pressure feeder adopts frequency converter speed regulation, which not only meets the requirements of different pressure frequency of customers, but also makes the whole machine compact and light. The machine was tested by the Catalyst Factory of Shandong First Fertilizer Plant, which proved that the pressing effect is very good, and can completely replace the manual pressing material, greatly improving production efficiency and ensuring production safety.
The hot rolled Steel Ball manufactured by rotary cutting and roll forging, has the advantages of large output, stable quality and high delivery speed,,especially suitable for long association purchasing of large mining groups. Hot Rolling Ball production process is: Raw material -Hot Rolling Mill - Water Quenching -Tempering
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