Clamp nut casting technology based on casting and rolling combined forming

Abstract

The invention discloses a clamp nut casting technology based on casting and rolling combined forming. According to the casting technology, casting ingredients are mixed by the ratio of carbon steel: scrap iron=89-90%:10-20%, a clamp nut is directly formed through rolling and expanding in the casting process, and the working procedures of blanking, forging and punching in an existing technology are omitted. According to the designed clamp nut casting technology based on casting and rolling combined forming, in the casting process, the defects of shrinkage, porosity, segregation and the like of a casting blank are reduced, and grains are refined as much as possible, so that the high-quality clamp nut capable of meeting the requirement for rolling and expanding forming performance is manufactured; the clamp nut is provided with an obvious yielding platform which does not disappear along with time, the delayed fracture resistance is high, plasticity is high, machining and manufacturing pollution is small, and cost is low.

Description

technical field [0001] The invention relates to a fastening nut casting process based on casting-rolling composite forming. Background technique [0002] At present, the fasteners produced by many large steel mills mainly increase the strength by adding "V" or "VN" alloys, and the addition amount reaches about 0.15%. As we all know, the cost of adding alloys will increase by 300-400 yuan, while large When producing this type of fasteners on a large scale, due to the limitations of factors such as changes in alloy composition, production speed, smelting and rolling processes, the quality of the produced products is also unstable, and the phenomenon of low strength and unqualified strength-to-yield ratio often occurs , especially products with specifications below 14mm are more serious. [0003] In the prior art, the hot rolling forming process of fasteners uses forging blanks as raw materials, and realizes the forming of rings through the forging-punching-rolling process. Th...

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Problems solved by technology

[0002] At present, the fasteners produced by many large steel mills mainly increase the strength by adding "V" or "VN" alloys, and the addition amount reaches about 0.15%. As we all know, the cost of adding alloys will increase by 300-400 yuan, while large When producing this type of fasteners on a large scale, due to the limitations of factors such as changes in alloy composition, production speed, smelting and rolling processes, the quality of the produced products is also unstable, and the phenomenon of low strength and unqualified strength-to-yield ratio often occurs , especially products with specifications below 14mm are more serious

[0003] In the prior art, the hot rolling forming process of fasteners uses forging blanks as raw materials, and realizes the forming of rings through the forging-punching-rolling process. This process first produces steel ingots, and then in the steel plant The billet is cut on a forging hammer or other equipment to produce a round billet or square billet. After being transported to the ring production enterprise, it must be cut by a sawing machine to obtain the billet required for the ring, and then forged by a large hydraulic press or other forging equipment. into a round billet, and then obtain a ring blank by punching process, and then roll and expand it through a ring rolling machine; Sawing, forging, and punching all require large-scale equipment, which not only requires a large investment, but also consumes energy and power; the punching process and multiple heating cause material waste; there are large energy and power consumption, serious material waste, low efficiency, high cost, increase emissions and pollute the environment