Method for casting super-large type semi-gear ring

Abstract

The invention discloses a method for casting a super-large type semi-gear ring. An outer rim whole ring open riser and an insulating riser sleeve, inner circle allowance, and external circle chilling block chilling are adopted; and circular insulating blind risers are dispersed on an inner rim and the corresponding bottom is chilled by the chilling block correspondingly so as to obtain semi-gear ring blank. In the method for casting the super-large type semi-gear ring, the outer rim whole ring open riser and the insulating riser sleeve are adopted, so that the feeding capacity of the riser isenhanced and the tissue compactness of the prepared casting is obviously improved, simultaneously floating sand and sundries can float conveniently, and the defects of sand inclusion, air holes and inclusion are reduced; the whole ring inner allowance and sand lining chilling block chilling are adopted; the inner allowance can ensure that an outer rim wall thickness center moves inward; by sand lining chilling block chilling, the tissues of the gear surface and the gear root are densified, and the defect of magnaflux inspection is reduced; and the inner allowance is not removed during furtherprocessing, the blank gear surface quality of the semi-gear ring is guaranteed, and the gear surface magnetic powder and ultrasonic flaw detection yield is improved.

Description

technical field [0001] The invention relates to the technical field of production of an extra-large half ring gear, in particular to a casting method of an extra-large half ring gear. Background technique [0002] Large gear rings are key transmission components in large rotary kilns, mills, building materials, mining, metallurgy, and electrical machinery equipment. The quality of gear rings directly affects the life, performance and transmission stability of equipment. Therefore, how to improve The quality of large gear rings becomes a crucial issue. With the development of the economy and the advancement of science and technology, the specifications of large gear rings used in the field of building materials and metallurgy in the world have developed from 4000-6000 mm in diameter to more than 10000 mm in diameter at present. The specifications are getting larger and the quality requirements are getting higher and higher. In addition to requiring good fatigue resistance, ...

AI Technical Summary

Problems solved by technology

Due to the wide range of solidification and crystallization of the super-large half ring gear, its solidification characteristics determine that shrinkage cavities and shrinkage defects are prone to occur during the casting process, especially in the existing casting process, see attached figure 1 As shown, the risers are scattered at the vertical ribs of the inner and outer rims, and the subsidy is placed under the corresponding risers on the outer side of the outer rim. During the processing of the half ring gear, the milling depth of the rim reaches half of the thickness of the outer rim. Casting defects often appear at the root of the tooth after machining

In addition, due to the large diameter of the half ring gear, the amount of molten steel used is large, the contact time between the molten steel and the molding sand is long during the casting process, and the defects of trachoma and air holes are relatively prominent during production. Excessive magnetic marks often appear after magnetic particle inspection, which not only affects the quality of the product , increase the cost, and affect the delivery time

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