CN102974774A

CN102974774A - Production process of irregular ring type casting

Info

Publication number: CN102974774A
Application number: CN 201210527120
Authority: CN
Inventors: 刘登发
Original assignee: Hengyang Fengshun Automobile Axle Co Ltd
Current assignee: Hengyang Fengshun Automobile Axle Co Ltd
Priority date: 2012-12-10
Filing date: 2012-12-10
Publication date: 2013-03-20

Abstract

The invention discloses a production process of an irregular ring type casting. The production process is characterized by comprising the technical steps of molding, core making, smelting, pouring and splitting. A combined die is adopted; a wet sand core is arranged in the combined die, and a metal shell is arranged outside the combined die; the wet sand core is high in deformability; the casting is low in casting stress, difficult to deform and high in sand discharging performance; the metal shell can guarantee the tissue compactness and the surface quality of the casting; and the yield of a product is over 95 percent.

Description

Irregular lopps castings production technique

Technical field

The present invention relates to a kind of metal casting production method, particularly a kind of irregular lopps castings production technique.

Background technology

At present, producing in the process such as irregular circular pieces such as Gate-valve sealing rings, is to cast first the long rough casting that overlaps shape, and then cuts into the single-piece blank and process.Because rough casting is irregular long cover shape, is difficult to cast with centrifugal process, mainly still relies at present the sand mould casting, but when foundry goods is thick when large, cooling velocity is slow, and its inverse segregation phenomenon is serious, cause organizing not fine and close, there is pore, loose on the surface, and the mechanical performance of foundry goods and withstand voltage properties descend.

Summary of the invention

The objective of the invention is in order to overcome above-mentioned weak point, and provide that a kind of foundry goods is indeformable, dense structure's property and the good irregular lopps castings production technique of surface quality.

For achieving the above object, the concrete technology step of the present invention's employing is as follows:

1, die modeling, coremaking: for the cylindricality green core, be axially extending bore is arranged the combination die of cylindrical metal shell in the core outward, have on the core bottom surface from middle outside equally distributed radially groove in selecting, the axially extending bore lower end with each radially groove be communicated with.

2, melting: with the cast of can coming out of the stove after melt fully, degas of cast metal heating raw materials.

3, cast: before the cast, the metal shell to 110 of first preheated mold ℃～150 ℃, core moisture are controlled at 3.5%～5%, mould are placed on the sand mold base plate again, and the axially extending bore upper port casting metal material solution in core is to watering flat being limited.

4, cut processing: form removal, remove redundance, will grow cover shape rough casting and cut into the single-piece blank, again the single-piece blank is processed into product.

The present invention is green core in selecting, is the combination die of metal shell outward that the green core deformability is good owing to adopt above process, casting stress is little, and is not yielding, and the performance of shaking out is good, metal shell then can guarantee foundry goods dense structure property and surface quality, and product qualification rate reaching is more than 95%.

The specific embodiment

Take produce inwall with the Gate-valve sealing ring of rotation convex tendon as example:

1, select in for cylindrical green core, be the combination die of cylindrical metal shell outward, there is axially extending bore at the core center, outwards equally distributed 4 grooves are radially arranged on the core bottom surface from the center, radially the groove outer end is communicated with respectively the rotary casting groove on the outer peripheral face, and the axially extending bore lower end is communicated with groove radially.

2, the cast metal heating raw materials can be come out of the stove after melt fully, degas cast.

3, before the cast, the metal shell to 110 of first preheated mold ℃～150 ℃, core moisture are controlled at 3.5%～5%, mould are placed on the sand mold base plate again, and the axially extending bore upper port casting metal material solution in core is to watering flat being limited.

4, redundance is removed in form removal, will grow cover shape rough casting and cut into the single-piece blank, again the single-piece blank is processed into product.

Claims

1. irregular lopps castings production technique is characterized in that through following processing step:

(1), die modeling, coremaking: for the cylindricality green core, be axially extending bore is arranged the combination die of cylindrical metal shell in the core outward, have on the core bottom surface from middle outside equally distributed radially groove in selecting, the axially extending bore lower end with each radially groove be communicated with;

(2), melting: with the cast of can coming out of the stove after melt fully, degas of cast metal heating raw materials;

(3), cast: before the cast, the metal shell to 110 of first preheated mold ℃～150 ℃, core moisture are controlled at 3.5%～5%, mould are placed on the sand mold base plate again, and the axially extending bore upper port casting metal material solution in core is to watering flat being limited;

(4), cut processing: form removal, remove redundance, will grow cover shape rough casting and cut into the single-piece blank, again the single-piece blank is processed into product.