The allowable deviation of dimension and net weight of castings and the remaining processing quantity of castings shall be determined according to gb6414-86gb/t11351-89gb/t11350-89 specifications and ordering technical standards. The specific deviation shall be determined according to the data information of the technical inspection unit. Frankly speaking, casting size manipulation is to manipulate the dispersion of average error on the premise that the average value and casting size meet the premise. Such discrete variables are usually caused by arbitrary changes or systematic errors, such as production process standards and raw material characteristics.
The design of castings shall meet the requirements of strength and stiffness. It is an important problem to meet the strength of box parts with great stress; But for most cases, the main index to evaluate the performance is stiffness, because the stiffness of the case not only affects the normal operation of the transmission parts, but also affects the working accuracy of the components. The automatic model selection of castings is included.
What should be paid attention to in Dalian casting design
1. The symmetrical structure shall be adopted in the structural design as far as possible, and the linear contour (for casting) shall be adopted as far as possible for the part contour, so as to facilitate the uniform stress and deformation of the structure.
2. The casting wall thickness of parts shall be as uniform as possible, and the transition shall be smooth without too much protrusion. Some edges or corners shall be transited with larger radian as far as possible to avoid casting stress and processing stress.
3. The arrangement of stiffeners shall be uniform and orderly. Whether rectangular or circular, they shall not be too dense (the structure cannot be poured) or too sparse (the structural stiffness is not enough). Full consideration shall be given to the stress characteristics of parts casting, the place where the stiffened plate is reinforced, and the place where the stiffened plate should be left as empty as possible.
4. On the premise of meeting the rigidity requirements and structural characteristics, the casting volume (overall dimension) of parts shall be reduced as far as possible, which not only saves the casting cost, but also makes the casting modeling more convenient (wood mold design and production). At the same time, the structure of parts can be made more compact.
Cast steel products such as large gears, hollow shafts, slag tanks, slag pools, beams and bases are widely used in construction, metallurgy and mining industries, but the product specifications required by each customer are different. Some manufacturers provide one-stop services, have a complete production chain, and provide one-stop services from rough machining and rough machining to finished products. The whole casting process is controlled, the quality is guaranteed, and the delivery time is shorter, which saves time and energy for customers. Large steel casting manufacturers have rich casting production experience, which can meet the needs of different products and provide high-quality products.
Precision casting can be used to cast superalloy castings, such as jet engine blades, streamlined profiles and cooling chambers, which are difficult to form by machining technology. However, the use of precision casting technology can not only achieve mass production and ensure the consistency of castings, but also avoid the residual tool traces after processing.
