1 material control
First, because of the special working conditions, vibration sieve therefore, material choice is very important, especially the key components of the material. The current market product quality uneven, some good and some bad, so the market competition is not standardized, the vibration sieve material, should be preferred procurement, for a retest of purchase quality and establish files. Our state has direct relationship with the vibration sieve manufacturing enterprises. Second, according to user requirements of material selection, the incoming material quality certificate file, save as a product quality tracking analysis judgment. Third, material control content. One is according to the qualified subcontractors requires the selection of supply enterprises, the establishment of product quality tracking system, dynamic assessment of supply enterprises. Two is to
The main physicochemical properties of steel sampling. The three is to supply enterprises, stock name, quantity and use of the material product contract number registration, the product inspection certificate, the original sampling record filing. Four is to take inspection measures mainly materials of key parts, ensure
Defects are not used for products.
2 the manufacturing accuracy control
In addition to the shape and position control and roughness control, the most important is the control of welding deformation. Welding deformation is one of the main gap between Chinese and foreign famous brａnd products of vibrating screen, mainly appears the welding deformation of steel, the deformation is up to several millimeters. Screen frame longitudinal beam, a feeding box and the rear baffle plate and box type vibrator sieve with straight line both sides of the main beam connecting plate all have this problem, foreign brand-name products welding parts to keep straight, no visible deformation, including welding with continuous long welding seam. Screen frame component for the welding parts, the domestic enterprises generally use the manual electric arc welding single, this method is often used for small pieces of welding, but for the main beam of 30mm above the plate must be multi pass welding, resulting in low efficiency and the welding skin cleaning dirty, easy to form a slag and other defects. The modern manufacturing industry has been widely used in CO2 gas shielded welding, the welding of low cost, easy to operate, with a fine wire welding deformation small, weld anti rust, corrosion resistance, arc concentrated heat and strong penetration, can replace manual electric arc welding. In addition, submerged arc welding has good applicability for more than 30mm welding, the screen frame steel for low carbon steel, has good weldability, but the structure of the screen frame and the stress state is much different from the general steel structure and pressure vessel, so the choice of welding method according to the specific conditions of the workpiece, the formulation of welding process, in the manufacturing process, to the strict implementation of welding technology can resolve the problem of deformation.
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