Technical requirements for die casting

When talking about die casting, do you know the technical requirements for it? Today we will go through this topic from five aspects to give you some information about Sieg-Huao’s main manufacturing process-high pressure die casting.There are different related national standards for chemical composition of alloy material, mechanical properties, dimensions and tolerances of die casting parts and surface roughness of the castings. This is the necessary conditions to produce qualified die casting parts. 

1. Chemical composition of alloy material. In order to assure the quality of raw materials, the chemical composition of the alloy shall comply with GB/T15115.

2. Mechanical properties. When the die-casting sample is used for inspection, its mechanical properties shall comply with the provisions of GB/T15115. When the die casting parts are used for body test, the mechanical properties of the cutting sample at the designated part shall not be lower than 75% of the single casting sample. If there are special requirements, it can be agreed by both parties.

3. Dimensions of die casting parts. The geometrical shape and size of die casting parts shall conform to the requirements of casting pattern. Dimension tolerance of die casting parts shall be carried out in accordance with the provisions of GB6414. In case of special regulations and requirements, it shall be noted on the drawing. If there is any physical tolerance of die casting parts the marking method shall be in accordance with the provisions of GB1182.

4.Dimension tolerance of die casting parts does not include casting slant, and its un-machined surface: the inclusion surface is based on small end, and it shall be indicated on the drawing when there are special regulations and requirements. When mechanical machining is required for die casting parts, the machining allowance shall be in accordance with GB/T11350. In case of special requirements, the additional workload shall be indicated on the drawing.

5.Surface quality of die casting parts. The surface roughness of the castings should conform to the rule of GB6060.1. The casting is not allowed to have cracks, under-casting, looseness, bubbles and any penetration defects. No abrasions, dents, lack of flesh and mesh burrs are allowed in the casting, but the extent and quantity of defects should be consistent with the agreed standards. Casting sprays, flanges, spillages, skins, ejector marks and etc. shall be cleaned, but it is allowed to leave marks. If there is no special stipulation on the drawing, the setting of the die casting process, such as the position of the top bar, the position of the parting line, the position of the gate and the overflow port, shall be determined by the manufacturer. Otherwise the drawing shall be indicated or agreed upon by both parties. 

If you want to know much about technical requirements for die casting please feel free to contact us!