The design of the casting must fully consider the wall thickness of the casting, the forging arc and the draft angle of the casting, the ribs, the casting holes on the casting and the small distance from the hole to the edge, the square holes and grooves on the casting, There are seven levels of inserts in the castings and the remaining amount of processing of the castings.

Forging arc design standard: Generally, each part of the casting needs to have an arc (other than the analysis surface), which can stabilize the fluidity of the metal material when it is filled, and the vapor can be easily discharged, and can prevent the obtuse angle. Cause cracks. For castings that must be electroplated and scraped, the arc can be evenly coated to avoid the deposition of architectural coatings at oblique angles. The half-circular arc R of the casting is generally not suitable for millimeters, and the small half-circular arc is 0.5 mm.

Design standards for inserts in castings: first, the total number of inserts on the casting is not suitable for too much; second, the connection between the insert and the casting must be strong, and in addition, slotting, protrusions, knurling, etc. are specified on the insert ; Again, the insert must be prevented from beveling, which is easy to place and avoid the stress of the casting. If there is a serious thermoelectric etching effect between the casting and the insert, the surface of the insert must be coated for maintenance; the casting with the insert The quenching and tempering treatment should be prevented to prevent the volume change caused by the change of the two metal materials and loosening the insert.

Design Standard for Forging Arc of Casting
Design standards for wall thickness of castings: thick walls have higher compressive strength and stronger density than thin-walled castings. In view of this, the design plan of castings should follow such standards: ensure that castings have sufficient Under the premise of compressive strength and rigidity, the wall thickness should be reduced as much as possible, and the wall thickness should be kept uniform. Practical experience, the design of the wall thickness of castings is generally 2.5-4mm, and parts with wall thickness exceeding 6mm are not suitable for casting manufacturing. The main performance of the casting wall is too thick and the wall is too thin for the quality of the casting: if the wall of the casting is too thin in the design scheme, the metal material will not be well welded, and the compressive strength of the casting will be jeopardized immediately, which will also cause forming Difficult; when the wall is too thick or severely uneven, it is very easy to cause deflation and cracks. On the other hand, with the increase of the wall thickness, the defects such as vents and shrinkage inside the casting also increase, and they will also decrease. The compressive strength of castings jeopardizes the quality of castings.

Design standards for the remaining amount of castings: under normal circumstances, due to the limitations of the casting process, some specifications of castings, such as precision, roughness or dimensional tolerances, cannot meet the requirements of commodity engineering drawings, the company should first fully consider the selection Such as calibration, drawing, extrusion molding, plastic surgery and other methods of casting and rolling production and repair to carry out repairs, when casting and rolling production and processing can not completely deal with this problem, you should carry out mechanical processing and manufacturing of some parts of the casting, It should be noted here that when carrying out mechanical processing and manufacturing, it is necessary to consider the remaining amount of processing. In addition, as far as possible, the surface layer that will not be harmed by the analysis surface and the formation of the theme activity is used as the reference point for the blank to prevent hazardous processing. Precision.

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