CN103350167B - Roll forming method of 4340 H steel E-shaped ring forging - Google Patents
Roll forming method of 4340 H steel E-shaped ring forging Download PDFInfo
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- CN103350167B CN103350167B CN201310269285.4A CN201310269285A CN103350167B CN 103350167 B CN103350167 B CN 103350167B CN 201310269285 A CN201310269285 A CN 201310269285A CN 103350167 B CN103350167 B CN 103350167B
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Abstract
The invention discloses a roll forming method of a 4340 H steel E-shaped ring forging, which is provided for guaranteeing a forming size of the E-shaped ring forging and preventing the defects of folding, offset, insufficient filling and the like. The method comprises processing steps as follows: a 4340 H steel bar material which is subjected to blanking according to specification is heated to a forging temperature ranging from 1,100 DEG C to 1,140 DEG C and is upset and punched to obtain a primary ring blank on a press machine; then, the primary ring blank is heated to a forging temperature ranging from 1,120 DEG C to 1,160 DEG C and is subjected to inner-bore material gathering to obtain a secondary ring blank on a ring rolling machine; and the secondary ring blank is placed in the ring rolling machine equipped with a main roller die for roll forming after the secondary ring blank is heated to a forging temperature ranging from 1,140 DEG C to 1,200 DEG C, the deformation is larger than or equal to 45%, and the E-shaped ring forging is obtained. The E-shaped ring forging is subjected to quenching and high-temperature tempering thermal treatment after forged, the quenching is that the E-shaped ring forging is heated to 860 DEG C and is subjected to oil cooling after thermal insulation, and the high-temperature tempering is that the E-shaped ring forging is heated to 590 DEG C and is subjected to air cooling after thermal insulation. The forging is mainly used for the field of wind power and mining machinery and the like.
Description
Technical field
The present invention relates to a kind of forging method of annular element, particularly relate to the roll-forming method of 4340H steel E type ring forging.
Background technology
4340H steel is a kind of structural steel of function admirable, under quality adjustment condition, there is good quenching degree and preferably intensity and toughness, large-scale load-carrying construction part can be manufactured, therefore, 4340H is widely used in the high strength key components and parts in the field such as wind-power electricity generation, mine equipment.
Disclosed in 8 days October in 2008, Chinese invention patent description CN 101279343A discloses a kind of method for rolling and shaping of stainless steel special-shaped ring forging, the method comprises blanking, jumping-up, punching, looping mill rolling, after the method punching, being shaped by designing the direct looping mill rolling of difform mould, realizing the rolling and shaping of forging special-shape ring.But the intermediate blank of the method is the rectangular bloom obtained after rolling in advance, high for the strength of materials, complex-shaped forging special-shape ring, as 4340H steel " E " type ring forging, if adopt said method to be shaped, easily occur folding, partially neck, the defect such as to be not fully filled.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of internal diameter and gathers material base to realize the roll-forming method of 4340H steel E type ring forging, and the method can ensure the roll forming size of 4340H steel E type ring forging.
For solving the problems of the technologies described above, the milling method of 4340H steel E type ring forging of the present invention, its technical scheme comprises the following steps:
4340H Steel Bar by specification blanking is heated to the forging temperature of 1100 DEG C ~ 1140 DEG C, on forcing press, after jumping-up, punching, obtains a secondary ring base;
After a described secondary ring base is heated to the forging temperature of 1120 DEG C ~ 1160 DEG C, on looping mill, after the poly-material of internal diameter, obtain two secondary ring bases;
After described two secondary ring bases are heated to the forging temperature of 1140 DEG C ~ 1200 DEG C, put it into home roll mould is housed looping mill on roll forming, its deflection >=45%, obtains E type ring forging.
Through quenching+high tempering heat treatment after described 4340H steel E type ring forging forging, i.e. Tempering and Quenching, described quenching is that 4340H steel E type ring forging is heated to 860 DEG C of oil coolings after insulation, and described high tempering is that 4340H steel E type ring forging is heated to 590 DEG C of air coolings after insulation.
Compared with prior art, beneficial effect of the present invention is as follows:
The roll-forming method of 4340H steel E type ring forging of the present invention, by the design to intermediate blank, makes blank distribute along ring longitudinal section, thus each size of the final E type ring forging be shaped all is met the demands.Adopt internal diameter to gather the blank-making method of material, only core roller mould need be used just to complete base process, avoid the poly-material of external diameter, need drop into home roll mould, and home roll mould is heavy and costly, processing duration, installation is the shortcoming such as inconvenience relatively.The two secondary ring bases that the method obtains, through roll forming, its deflection >=45%, can obtain the E type ring forging of sense of organization excellence.
Sectional dimension through measuring 4340H steel E type ring forging all meets instructions for use.
The room temperature tensile properties of 4340H steel E type ring forging after testing, its tensile strength is the 980MPa that 1030MPa(is greater than instructions for use), yield strength when its percentage elongation is 0.2% is the 835MPa that 863MPa(is greater than instructions for use), elongation after fracture is that 18%(is greater than 12% of instructions for use), the contraction percentage of area is that 64%(is greater than 55% of instructions for use), hardness HB is that 325(meets 300 ~ 345 of instructions for use), meet instructions for use completely.
The macrostructure of 4340H steel E type ring forging after testing: have no blackspot, hickie, radial segregation, spheroidal structure and other defect, meet instructions for use.
The grain size of 4340H steel E type ring forging after testing, reaches 8.5 grades (being greater than 6.5 grades of instructions for use).
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Fig. 1 is the Forging Technology flow chart of 4340H steel E type ring forging.
Detailed description of the invention
The specific embodiment of the present invention is as follows:
The main chemical elements content (percentage by weight) of 4340H steel is: C content 0.36% ~ 0.44%, containing Mn amount 0.50% ~ 0.80%, si content 0.17% ~ 0.37%, containing S amount≤0.020%, P content≤0.020%, containing Cr amount 0.60% ~ 0.90%, ni content 1.25% ~ 1.75%, containing Mo amount 0.15% ~ 0.25%, surplus is Fe.
The forging and forming technology step of this steel E type ring forging is as follows:
As shown in Figure 1, the 4340H Steel Bar 10 by specification blanking is heated to the forging temperature of 1100 DEG C ~ 1140 DEG C, places it on the chopping block of forcing press, after jumping-up, punching, obtain a secondary ring base 20; After again a secondary ring base 20 being heated to the forging temperature of 1120 DEG C ~ 1160 DEG C, on the looping mill with core roller mould, after the poly-material of internal diameter, obtain two secondary ring bases 30; After again two secondary ring bases 30 being heated to the forging temperature of 1140 DEG C ~ 1200 DEG C, put it into home roll mould is housed looping mill on roll forming, its deflection >=45%, obtains E type ring forging 40.
After forging, 4340H steel E type ring forging 40 is through quenching+high tempering heat treatment, i.e. Tempering and Quenching, described quenching is that 4340H steel E type ring forging 40 is heated to 860 DEG C of oil coolings after insulation, and described high tempering is that 4340H steel E type ring forging 40 is heated to 590 DEG C of air coolings after insulation.
Claims (2)
1. a roll-forming method for 4340H steel E type ring forging, is characterized in that, comprise the following steps:
4340H Steel Bar by specification blanking is heated to the forging temperature of 1100 DEG C ~ 1140 DEG C, on forcing press, after jumping-up, punching, obtains a secondary ring base;
After a described secondary ring base is heated to the forging temperature of 1120 DEG C ~ 1160 DEG C, on looping mill, after the poly-material of internal diameter, obtain two secondary ring bases;
After described two secondary ring bases are heated to the forging temperature of 1140 DEG C ~ 1200 DEG C, put it into home roll mould is housed looping mill on roll forming, its deflection >=45%, obtains E type ring forging.
2. the roll-forming method of 4340H steel E type ring forging according to claim 1, it is characterized in that: through quenching+high tempering heat treatment after described 4340H steel E type ring forging forging, i.e. Tempering and Quenching, described quenching is that 4340H steel E type ring forging is heated to 860 DEG C of oil coolings after insulation, and described high tempering is that 4340H steel E type ring forging is heated to 590 DEG C of air coolings after insulation.
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| CN201310269285.4A CN103350167B (en) | 2013-06-30 | 2013-06-30 | Roll forming method of 4340 H steel E-shaped ring forging |
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| CN201310269285.4A CN103350167B (en) | 2013-06-30 | 2013-06-30 | Roll forming method of 4340 H steel E-shaped ring forging |
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| CN103350167A CN103350167A (en) | 2013-10-16 |
| CN103350167B true CN103350167B (en) | 2015-04-22 |
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| CN105081678B (en) * | 2014-05-13 | 2018-01-16 | 陕西宏远航空锻造有限责任公司 | A kind of method for rolling and shaping of nickel base superalloy height cylinder ring |
| CN104148557B (en) * | 2014-06-30 | 2016-05-25 | 贵州安大航空锻造有限责任公司 | The super plastic forming method of GH4169 alloy complex section annular element |
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| CN111705187A (en) * | 2020-07-02 | 2020-09-25 | 南京迪威尔高端制造股份有限公司 | Manufacturing method for reducing stress cracks of 4340 steel ring piece |
| CN112296245B (en) * | 2020-09-17 | 2023-01-31 | 豪梅特航空机件(苏州)有限公司 | Forging method for improving creep property of Wasp ring forging |
| CN115229441B (en) * | 2022-07-26 | 2024-02-09 | 重庆金世利航空材料有限公司 | Manufacturing method of small titanium alloy high-cylinder ring rolled piece |
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| JPH06106283A (en) * | 1992-09-28 | 1994-04-19 | Kobe Steel Ltd | Method for forming ring having partial projection on its outer circumference |
| JP2006289394A (en) * | 2005-04-07 | 2006-10-26 | Daido Steel Co Ltd | METHOD FOR MANUFACTURING RING MADE OF Mn-Cu ALLOY |
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| KR20110075130A (en) * | 2009-12-28 | 2011-07-06 | 한국기계연구원 | A semi-finished ring rolling machine and manufacturing method for profiled ring |
| CN103100622A (en) * | 2012-12-12 | 2013-05-15 | 贵州航宇科技发展股份有限公司 | Roll shaping method of ultrahigh-strength steel complex deformed section annular piece |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH06106283A (en) * | 1992-09-28 | 1994-04-19 | Kobe Steel Ltd | Method for forming ring having partial projection on its outer circumference |
| JP2006289394A (en) * | 2005-04-07 | 2006-10-26 | Daido Steel Co Ltd | METHOD FOR MANUFACTURING RING MADE OF Mn-Cu ALLOY |
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| KR20110075130A (en) * | 2009-12-28 | 2011-07-06 | 한국기계연구원 | A semi-finished ring rolling machine and manufacturing method for profiled ring |
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