Hard alloy die size, hard alloy die geometry and size should be consistent with the provisions of the casting pattern. The dimensional tolerances of the die casting dies shall be performed in accordance with the regulations. When there are special provisions and requirements, must be marked on the drawing. Casting mould dimension tolerance does not include foundry gradient, the machined surface: inclusion of the small end as a benchmark, inclusive as big as the benchmark, the surface to be processed: inclusive as big as a benchmark, by inclusion of the small end as a benchmark, there are special provisions and requirements shall be indicated in the figure.
When used in the casting mould test sample and its mechanical properties should comply with the provisions of the GB/T15114-1994 when used in the casting mould body inspection, the specified site cut the mechanical properties of the specimens shall not be less than single cast sample of 78%, if you have special requirements can be agreed upon by both sides of supply and demand.
The extent and quantity of the defects should be consistent with the standards agreed by both parties. The gate of casting mould, flying edge, overflow mouth, every skin, the mark of the top rod should be cleaned up. But allowed to leave a trace. If there is no special provisions to the pattern, settings related to die casting process, such as the top pole position, type line position, gate and an overflow port position by the production plant self imposed, otherwise pattern should be specified or agreed upon by both sides of supply and demand. Casting molds need special processing surface, such as polishing, shot blasting, chrome plating, coating, anodic oxidation, chemical oxidation and so on must be indicated on the drawing or agreed by both sides of supply and demand.
When the casting mold needs machining, the machining allowance shall be executed in accordance with the regulations. If there are special provisions and requirements, the machining allowance shall be marked on the drawing. Surface quality, surface roughness of the casting mold should be in accordance with the provisions. Casting molds are not allowed to have cracks, under casting, loose, air bubbles and any penetrating defects. Casting hard alloy mold allows for a scratch, depression, lack of meat and mesh burr and other defects
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