Foundry technique method of lower support board of ball type support

Abstract

The invention discloses a technological method for casting a lower support plate of a ball shaped support. The technological method comprises the following steps: according to the structural shape of the lower support plate of the ball shaped support, namely, a square plate, manufacturing a sand mold, adopting a shape of a water glass quartz sand pit, using an upward large plane of the lower support plate as a parting surface, and horizontally pouring the parting surface; scraping a lower middle circular lug boss and a concave spherical surface on the other side by a scraper (1), pounding therest parts by natural patterns, and providing outer chill blocks (2) at four cast corners thereof; providing a pouring head outside the sand mold, and adopting a reverse-bottom pouring head in an inner pouring channel (3); and pounding an upper mold by a sand box, and providing a shrink head table and a shrink head horizontal reinforce (6) in the center part. The technological method reduces the defects such as planar sand holes, sand marks, and the like on the cast, meets the feeding requirement of the cast, ensures compactness inside the cast, improves quality of the cast, and reduces production cost.

Description

technical field [0001] The invention belongs to the technical field of casting, in particular to a casting process method for a lower bearing plate of a spherical bearing used for a bridge bearing. Background technique [0002] The bridge bearing is an important structural component connecting the upper structure and the lower structure of the bridge. It can reliably transmit the reaction force and deformation (displacement and rotation angle) of the upper structure of the bridge to the lower structure of the bridge, so that the actual stress of the structure is consistent with the calculation. consistent with the theoretical schema. The spherical bearing is a kind of bridge bearing, and the lower bearing plate is one of the three major parts of the spherical bearing. It is made of low carbon steel and is assembled on the bottom pier of the spherical bearing to bear the bridge load. (bearing more than 10,000 tons). Due to the particularity of the used parts, the design req...

AI Technical Summary

Problems solved by technology

The existing casting process has the following problems: 1) castings are poured horizontally with the large plane facing upwards, and defects such as trachoma and sand inclusions are prone to appear between the risers on the upper plane; The defect is located between the risers

3) The number of risers is large and the weight is large. The weight of the pouring riser accounts for 66-80% of the weight of the casting, and the production cost is relatively high.

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