CN101817134B - Short-flow casting and rolling composite forming method for ferrule piece - Google Patents
Short-flow casting and rolling composite forming method for ferrule piece Download PDFInfo
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- CN101817134B CN101817134B CN2010101324866A CN201010132486A CN101817134B CN 101817134 B CN101817134 B CN 101817134B CN 2010101324866 A CN2010101324866 A CN 2010101324866A CN 201010132486 A CN201010132486 A CN 201010132486A CN 101817134 B CN101817134 B CN 101817134B
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Abstract
The invention relates to a short-flow casting and rolling composite forming method for a ferrule piece, which belongs to a machining and forming method for a large-sized ferrule piece and mainly overcomes the technical difficulty that the conventional rolling method has high material waste and serious energy waste. The invention adopts the technical scheme that the short-flow casting and rolling composite forming method for the ferrule piece comprises the steps of alloy melting, molten steel refining, centrifugal casting of a ring blank, hot rolling and expanding, rough machining, heat treatment and finish machining, wherein the molten steel refining refers to external refining with an LF furnace and argon stirring to obtain high-purity molten steel; the centrifugal casting of the ring blank comprises that the refined molten steel is centrifugally cast at the temperature of 1,600 DEG C to form the ring blank, and meanwhile the cast blank grains are thinned by adopting electromagnetic stirring; and the hot rolling and expanding comprise that when the ring blank casting is solidified and the temperature drops to initial forging temperature of 1,200 DEG C, the rolling and expanding are directly performed on a rolling and expanding machine, the feeding amount is controlled during rolling and expanding, and the rolling-expanding ratio is 2 to 3.
Description
Technical field
The present invention relates to a kind of method of ferrule piece short-flow casting and rolling composite forming, it belongs to the method that a kind of large-scale ferrule piece shapes.
Background technology
Produce rings such as high-quality bearing ring and flange ring at present, method commonly used is divided into cold rolling expansion and hot the rolling expanded two kinds.Cold rolling expanding method is to utilize forging stock at room temperature to roll over expansion, though this method quality guarantees that easily it is big to need to roll over expansion power, only is applicable to the processing of small-sized ring.Heat is rolled over expanding method and is adopted forging stock-punching-heating-rolling expansion-machined-steps such as heat treatment usually, and this method is usually used in the production of large ring.And for the production of large ring, need carry out descale and punching owing to use forging heat to roll over to expand, and allowance is big, causes the waste of artificial and material.Ring need be carried out heating for multiple times before forging and rolling over expansion, cause the waste and the exhaust gas discharging of the energy.Therefore, this method exists the big and energy waste important disadvantages of waste of material.
Summary of the invention
The objective of the invention is to solve the big and serious technological difficulties of energy waste of waste of material that existing rolling expanding method exists, and a kind of method that can save the high ferrule piece short-flow casting and rolling composite forming of the material and the energy and production efficiency is provided.
The present invention for the technical scheme that solves above-mentioned technological difficulties and adopt is: a kind of method of ferrule piece short-flow casting and rolling composite forming, and it comprises alloy melting, and---liquid steel refining------centrifugal casting ring base is rolled over and is expanded---roughing---heat treatment---fine finishining step by heat; Described liquid steel refining is meant the external refining of employing ladle refining furnace (LF stove), and smelting temperature is 1630 ℃～1650 ℃, and Argon stirs and makes molten steel composition and the rapid homogenising of temperature, to obtain the molten steel of high purity; Described centrifugal casting ring base is meant that refined molten steel carries out centrifugal casting ring base in the time of 1600 ℃, adopts electromagnetic agitation refinement strand crystal grain simultaneously, reduces casting defect; Described heat is rolled over to expand and is meant that billet cast piece to be encircled solidifies, and temperature drops to when forging 1200 ℃ of initial forging temperatures, directly rolles over expansion on Ring Rolling Machine, rolles over when expanding and will control the amount of feeding, rolles over and expands than being 2-3; The described amount of feeding gets the small value between the maximum amount of feeding that pass allowed forging the saturating desired minimum amount of feeding and nip, and cast sturcture is changed into gradually forge tissue, fined and homogenising.
Because the present invention has adopted technique scheme, directly utilize the waste heat of strand to roll over expansion production large ring, reduced the heating number of times, saved cost, improved production efficiency.Roll over the expansion process and cast sturcture has been become forge tissue, make the quality of product parts reach the forging level, fully satisfy of the requirement of large ring such as bearing flange towards the development of fields such as wind-powered electricity generation, space flight.Therefore, compare with background technology, the present invention has following advantage.
1, energy savings: the present invention has saved the forging process in original method, utilizes the strand waste heat directly to roll over expansion, has reduced the heating number of times, has saved the energy.
2, reduce toxic emission: reduced exhaust gas discharging when reducing the heating number of times, protected environment.
3, economical with materials: strand can directly cast out required pass, saved the punching operation in original method, but economical with materials is more than 30%.Smelt remelting waste material is utilized again, further cut the waste, improve stock utilization.
4, save manually, boost productivity: utilize centrifugal strand directly to roll over expansion and can save operations such as forging, descale, punching, save manually, improved production efficiency.
The specific embodiment
The present invention is described in further detail below in conjunction with embodiment.
Embodiment 1
The method of a kind of ferrule piece short-flow casting and rolling composite forming in the present embodiment, it comprises alloy melting, and---liquid steel refining------centrifugal casting ring base is rolled over and is expanded---roughing---heat treatment---fine finishining step by heat; Described liquid steel refining is meant and adopts ladle refining furnace (LF stove) external refining, smelting temperature is 1630 ℃～1650 ℃, Argon stirs and makes molten steel composition and the rapid homogenising of temperature, reduce objectionable impurities and gas in the molten steel, in the process of refining, in stove, add alloy and carry out the composition fine setting, to obtain the molten steel of high purity; Described centrifugal casting ring base is meant that refined molten steel carries out centrifugal casting ring base in the time of 1600 ℃, adopts electromagnetic agitation refinement strand crystal grain simultaneously, reduces defective such as foundry goods segregation, improves equiaxial crystal ratio and slab quality; Described heat is rolled over to expand and is meant that billet cast piece to be encircled solidifies, and temperature drops to when forging 1200 ℃ of initial forging temperatures, directly utilizes waste heat to roll over expansion on Ring Rolling Machine, rolles over when expanding and will control the amount of feeding, rolles over and expands than being 2.The amount of feeding gets the small value between the maximum amount of feeding that pass allowed forging the saturating desired minimum amount of feeding and nip, cast sturcture is changed into gradually forge tissue, fined and homogenising, workpiece mechanical performance after making rolling expand reaches or near the forging level, reaches the purpose of shaping and modification simultaneously.Roughing: will roll over and expand the part Vehicle Processing to required size (leaving surplus).Heat treatment: further improve tissue by heat treatment, improve the mechanical property of product.Fine finishining: be ground to the product required size.
Embodiment 2
The method of a kind of ferrule piece short-flow casting and rolling composite forming in the present embodiment, it comprises alloy melting, and---liquid steel refining------centrifugal casting ring base is rolled over and is expanded---roughing---heat treatment---fine finishining step by heat; Described liquid steel refining is meant and adopts ladle refining furnace (LF stove) external refining, smelting temperature is 1630 ℃～1650 ℃, Argon stirs and makes molten steel composition and the rapid homogenising of temperature, reduce objectionable impurities and gas in the molten steel, in the process of refining, in stove, add alloy and carry out the composition fine setting, to obtain the molten steel of high purity; Described centrifugal casting ring base is meant that refined molten steel carries out centrifugal casting ring base in the time of 1600 ℃, adopts electromagnetic agitation refinement strand crystal grain simultaneously, reduces defective such as foundry goods segregation, improves equiaxial crystal ratio and slab quality; Described heat is rolled over to expand and is meant that billet cast piece to be encircled solidifies, and temperature drops to when forging 1200 ℃ of initial forging temperatures, directly utilizes waste heat to roll over expansion on Ring Rolling Machine, rolles over when expanding and will control the amount of feeding, rolles over and expands than being 3.The amount of feeding gets the small value between the maximum amount of feeding that pass allowed forging the saturating desired minimum amount of feeding and nip, cast sturcture is changed into gradually forge tissue, fined and homogenising, workpiece mechanical performance after making rolling expand reaches or near the forging level, reaches the purpose of shaping and modification simultaneously.Roughing: will roll over and expand the part Vehicle Processing to required size (leaving surplus).Heat treatment: further improve tissue by heat treatment, improve the mechanical property of product.Fine finishining: be ground to the product required size.
Embodiment 3
The method of a kind of ferrule piece short-flow casting and rolling composite forming in the present embodiment, it comprises alloy melting, and---liquid steel refining------centrifugal casting ring base is rolled over and is expanded---roughing---heat treatment---fine finishining step by heat; Described liquid steel refining is meant and adopts ladle refining furnace (LF stove) external refining, smelting temperature is 1630 ℃～1650 ℃, Argon stirs and makes molten steel composition and the rapid homogenising of temperature, reduce objectionable impurities and gas in the molten steel, in the process of refining, in stove, add alloy and carry out the composition fine setting, to obtain the molten steel of high purity; Described centrifugal casting ring base is meant that refined molten steel carries out centrifugal casting ring base in the time of 1600 ℃, adopts electromagnetic agitation refinement strand crystal grain simultaneously, reduces defective such as foundry goods segregation, improves equiaxial crystal ratio and slab quality; Described heat is rolled over to expand and is meant that billet cast piece to be encircled solidifies, and temperature drops to when forging 1200 ℃ of initial forging temperatures, directly utilizes waste heat to roll over expansion on Ring Rolling Machine, rolles over when expanding and will control the amount of feeding, rolles over and expands than being 2.5.The amount of feeding gets the small value between the maximum amount of feeding that pass allowed forging the saturating desired minimum amount of feeding and nip, cast sturcture is changed into gradually forge tissue, fined and homogenising, workpiece mechanical performance after making rolling expand reaches or near the forging level, reaches the purpose of shaping and modification simultaneously.Roughing: will roll over and expand the part Vehicle Processing to required size (leaving surplus).Heat treatment: further improve tissue by heat treatment, improve the mechanical property of product.Fine finishining: be ground to the product required size.
Rolling in the foregoing description is expanded than selecting arbitrarily between 2-3.
Claims (1)
1. the method for a ferrule piece short-flow casting and rolling composite forming is characterized in that: comprise alloy melting that---liquid steel refining------centrifugal casting ring base is rolled over and expanded---roughing---heat treatment---fine finishining step by heat; Described liquid steel refining is meant the external refining of employing ladle refining furnace (LF stove), and smelting temperature is 1630 ℃～1650 ℃, and Argon stirs and makes molten steel composition and the rapid homogenising of temperature, to obtain the molten steel of high purity; Described centrifugal casting ring base is meant that refined molten steel carries out centrifugal casting ring base in the time of 1600 ℃, adopts electromagnetic agitation refinement strand crystal grain simultaneously, reduces casting defect; Described heat is rolled over to expand and is meant that billet cast piece to be encircled solidifies, and temperature drops to when forging 1200 ℃ of initial forging temperatures, directly rolles over expansion on Ring Rolling Machine, rolles over when expanding and will control the amount of feeding, rolles over and expands than being 2-3; The described amount of feeding gets the small value between the maximum amount of feeding that pass allowed forging the saturating desired minimum amount of feeding and nip, and cast sturcture is changed into gradually forge tissue, fined and homogenising.
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| CN2010101324866A CN101817134B (en) | 2010-03-22 | 2010-03-22 | Short-flow casting and rolling composite forming method for ferrule piece |
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| CN2010101324866A CN101817134B (en) | 2010-03-22 | 2010-03-22 | Short-flow casting and rolling composite forming method for ferrule piece |
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| CN101817134B true CN101817134B (en) | 2011-09-07 |
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