Closed large-sized copper-nickel alloy BFe30-1-1 flange forming die and machining method

Abstract

The invention provides a closed large-sized copper-nickel alloy BFe30-1-1 flange forming die and a machining method. According to the machining method, the original copper-nickel alloy flange machining mode is changed. The closed flange forming die is designed, and comprises an upper die assembly and a lower die assembly, wherein the upper die assembly comprises an upper die backing plate and a pressing head; the pressing head is fixedly arranged below the upper die backing plate; an inner cavity is formed in the center of the pressing head; the lower die assembly comprises a lower die, a core rod and a lower die backing plate; the lower die is arranged above the lower die backing plate; a die cavity is formed in the center of the lower die; in the die cavity, the diameter of an upper-section die cavity is greater than that of a lower-section die cavity; the upper-section die cavity is in clearance fit with the pressing head; the core rod is arranged in the die cavity; the small end of the core rod faces up; the large end of the core rod faces down; the bottom surface of the core rod is attached to the lower die backing plate; an through hole is formed in the lower die backing plate below the core rod; the large end of the core rod is in clearance fit with the lower-section die cavity; and consequently, the utilization rate of raw materials of a copper-nickel alloy BFe30-1-1 flange product is greatly improved and the material cost is reduced.

Description

technical field [0001] The invention relates to the technical field of processing and manufacturing methods, in particular to a closed copper-nickel alloy flange forming mold and a processing method. Background technique [0002] Copper-nickel alloy is widely used in shipbuilding industry, chemical industry and marine engineering at home and abroad because of its excellent corrosion resistance, anti-marine fouling and other comprehensive properties, among which BFe30-1-1 is a high-alloyed Copper-nickel alloy materials are widely used to make pipeline accessories such as flange joints. [0003] Utility model patent CN201820251039.4 "One-time Forging Forming Die for Flange" introduces a one-time heating and closed hot extrusion forming method; invention patent CN201310510265.1 "A method for extrusion forming of parts with inner and outer flanges and Extrusion Die" introduces a forming method with internal and external flange parts; the invention patent CN201910495036.4 "A For...

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Problems solved by technology

However, the above-mentioned patents are not involved in the forming method and the forming mold of the copper-nickel alloy flange with large specifications and special purposes.

At present, the production of large-size flanges mostly adopts the free forging molding process. The specific process is to forge flange forging rings of corresponding specifications according to the flange dimensions and then machine them; forging rings are machined to form flanges, and the material utilization rate is low. Production higher cost

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