Casting of bearing housings

1) Determination of manufacturing process method

Analysis of the casting mechanism and its casting process, the bearing seat is used to clamp the bearing, so as to support the shaft and the parts on the shaft.

The weight of the casting is about 10Kg

Part material is HT200

Outline size (215X80X146) mm

Production program: mass production

2) Due to the small size of the casting, it is advisable to use a wet type with both veil and back yarn

3) Modeling method: whole mold, live block, two-box model modeling

4) Determination of parting surface

The entire shape of the bearing seat is used as the parting surface, and wood is used as the sand core of Φ62.5, and it is basically on one plane, so the entire shape of the bearing is selected as the parting surface, so that the entire cavity is in the lower shape, so that The type is also convenient for the security pouring of the riser.

5) Determination of the position of the pouring riser

The casting is HT200, and the volume shrinkage rate is small, but the casting is a thick solid part, so pay attention to the occurrence of shrinkage defects, so the position and direction of the introduction of the inner runner are very important. According to the structural characteristics of the casting, the use of directional According to the solidification principle, the inner runner should be introduced from the two ends of one side of the base, which can also prevent the sand mold of Φ62.5 from being damaged. The gate against the edge blanking gap can be used to reduce the contact heat between the gate and the casting. It can also avoid overheating of the thick part in the middle and shorten the solidification time, which is beneficial to obtain qualified castings. In addition, because the blank holder gate has a good feeding effect, the casting does not need to be provided with a feeding riser, in order to prevent the generation of pores. , you can set a Φ8-Φ10mm air outlet riser position at the top middle offset position.