CN103350329A - Blank making method of large 4340 H steel special-shaped ring forging - Google Patents
Blank making method of large 4340 H steel special-shaped ring forging Download PDFInfo
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- CN103350329A CN103350329A CN2013102704461A CN201310270446A CN103350329A CN 103350329 A CN103350329 A CN 103350329A CN 2013102704461 A CN2013102704461 A CN 2013102704461A CN 201310270446 A CN201310270446 A CN 201310270446A CN 103350329 A CN103350329 A CN 103350329A
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Abstract
The invention discloses a blank making method of a large 4340 H steel special-shaped ring forging. 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, stretched and upset to obtain a pie-shaped blank on a press machine; then, the pie-shaped blank is heated to a forging temperature ranging from 1,120 DEG C to 1,160 DEG C and is subjected to single-side material gathering, double-side material gathering and punching to obtain a primary blank on the press machine; and the pie-shaped blank is placed in a ring rolling machine equipped with a core roller for rolling after the pie-shaped blank is heated to a forging temperature ranging from 1,120 DEG C to 1,160 DEG C to obtain a secondary blank; and after the pre-rolling blank is formed through rolling, the large 4340 H steel special-shaped ring forging is obtained. The forming temperature ranges from 1,140 DEG C to 1,200 DEG C, the deformation is larger than or equal to 45%, the core roller of the ring rolling machine is combined by a core roller part and a special core roller, and 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 blank-making method of ring forging, particularly related to the blank-making method of the large scale special-shaped ring forging of 4340H steel.
Background technology
The 4340H steel is a kind of structural steel of function admirable, under quality adjustment condition, have good quenching degree and preferably intensity and toughness, can make large-scale load-carrying construction spare, therefore, 4340H is widely used in the high strength key components and parts in the fields such as wind-power electricity generation, mine equipment.
On October 8th, 2008, disclosed Chinese invention patent specification CN 101279343A disclosed a kind of method for rolling and shaping of stainless steel special-shaped ring forging, the method is to finish the preparation of intermediate blank by the rectangular bloom that obtains after rolling in advance, it is lower that this blank-making method is applicable to the strength of materials, the simple middle-size and small-size forging special-shape ring of cross sectional shape, and it is high for the strength of materials, complex-shaped large scale special-shaped ring forging, such as the large scale special-shaped ring forging of 4340H steel, if adopt said method to be shaped, roll-force requirement to looping mill is very large, and occurs easily folding, inclined to one side neck, the defective such as be not fully filled.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of blank-making method at the poly-large scale special-shaped ring forging of 4340H steel of expecting, rolling in advance of forcing press on looping mill.
For solving the problems of the technologies described above, the blank-making method of the large scale special-shaped ring forging of 4340H steel of the present invention, its technical scheme may further comprise the steps:
After 4340H Steel Bar During by the specification blanking being heated to 1100 ℃ ~ 1140 ℃ forging temperature, on forcing press, through jumping-up, pulling, obtain the cheese base behind the jumping-up again;
The forging temperature of described cheese blank heating to 1120 ℃ ~ 1160 ℃, on forcing press, base of acquisition after the poly-material of single face, two-sided poly-material, punching;
After described circular material blank being heated to 1120 ℃ ~ 1160 ℃ forging temperature, put it into carrying out roll off on the looping mill of core roller, obtain the secondary base.
Described pre-rolling stock obtains the large scale special-shaped ring forging of 4340H steel after roll forming.Described rolling temperature is 1140 ℃ ~ 1200 ℃, deflection 〉=45%.
The core roller of described looping mill is combined by general core roller and special-purpose core roller.
Compared with prior art, beneficial effect of the present invention is as follows:
The blank-making method of the large scale special-shaped ring forging of 4340H steel of the present invention, by the dish type blank being gathered material, punching, rolling the large scale special-shaped ring base of rear acquisition 4340H steel in advance, blank is distributed along the ring longitudinal section, thereby so that each size of the final large scale special-shaped ring forging that is shaped all meet the demands.The core roller that adopts is combined type core roller, and it comprises general core roller and combination core roller, for difform annular, only needs to change combination core roller and get final product, has avoided the whole core roller of replacing and causes waste.The large scale special-shaped ring base that the method obtains, through roll forming, its deflection 〉=45% can obtain the large scale special-shaped ring forging of sense of organization excellence.
Adopt the blank-making method of the large scale special-shaped ring forging of 4340H steel of the present invention, the large scale special-shaped ring base of the 4340H steel of acquisition obtains the large scale special-shaped ring forging of 4340H steel after roll forming, and its performance indications are as follows:
Sectional dimension through measuring the large scale special-shaped ring base of 4340H steel all meets instructions for use.
The room temperature tensile performance of the large scale special-shaped ring forging of 4340H steel after testing, its tensile strength is that 1030MPa(is greater than the 980MPa of instructions for use), yield strength when its percentage elongation is 0.2% is that 863MPa(is greater than the 835MPa of instructions for use), elongation after fracture be 18%(greater than instructions for use 12%), the contraction percentage of area be 64%(greater than instructions for use 55%), hardness HB be 325(satisfy instructions for use 300 ~ 345), satisfied instructions for use fully.
The macrostructure of the large scale special-shaped ring forging of 4340H steel after testing: have no blackspot, hickie, radially segregation, spheroidal structure and other defective, meet instructions for use.
The grain size of the large scale special-shaped ring forging of 4340H steel has after testing reached 8.5 grades (greater than 6.5 grades of instructions for use).
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.
Fig. 1 is the poly-material blank-making technology flow chart of the large scale special-shaped ring forging of 4340H steel;
Fig. 2 is base schematic diagram of the large scale special-shaped ring forging of 4340H steel;
Fig. 3 is the core roller schematic diagram of looping mill;
Fig. 4 is the large scale special-shaped ring forging secondary of 4340H steel base schematic diagram.
The specific embodiment
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%, contain Mn amount 0.50%～0.80%, si content 0.17%～0.37%, contain S amount≤0.020%, P content≤0.020%, contain Cr amount 0.60%～0.90%, ni content 1.25%～1.75%, contain Mo amount 0.15%～0.25%, surplus is Fe.
The blank-making method step of the large scale special-shaped ring forging of this steel is as follows:
As shown in Figure 1, the 4340H Steel Bar During by the specification blanking is heated to 1100 ℃ ~ 1140 ℃ forging temperature after, be placed on the forcing press, through jumping-up, pulling, obtain cheese base 10 behind the jumping-up again; Again described cheese base 10 is heated to 1120 ℃ ~ 1160 ℃ forging temperature, and place it on the forcing press, one side with 30 pairs of cheese bases 10 of lower poly-material drift is gathered material, again cheese base 10 is turned, keep the invariant position of lower poly-material drift 30 in cheese base 10, the another side of using 31 pairs of cheese bases 10 of poly-material drift gathers material, obtains a base 11 after to cheese base 10 punchings behind the poly-material, as shown in Figure 2.
After a described base 11 being heated to 1120 ℃ ~ 1160 ℃ forging temperature, put it into carrying out roll off on the looping mill of core roller, obtain secondary base 12.The structure of core roller comprises general core roller 20 and special-purpose core roller 21 as shown in Figure 3, and special-purpose core roller 21 can be selected according to the cross sectional shape of annular element.
Described pre-rolling stock obtains the large scale special-shaped ring forging of 4340H steel after roll forming.Described rolling temperature is 1140 ℃ ~ 1200 ℃, deflection 〉=45%.
Claims (3)
1. the blank-making method of the large scale special-shaped ring forging of 4340H steel is characterized in that, may further comprise the steps:
After 4340H Steel Bar During by the specification blanking being heated to 1100 ℃ ~ 1140 ℃ forging temperature, on forcing press, through jumping-up, pulling, obtain the cheese base behind the jumping-up again;
The forging temperature of described cheese blank heating to 1120 ℃ ~ 1160 ℃, on forcing press, base of acquisition after the poly-material of single face, two-sided poly-material, punching;
After described circular material blank being heated to 1120 ℃ ~ 1160 ℃ forging temperature, put it into carrying out roll off on the looping mill of core roller, obtain the secondary base.
2. the blank-making method of the large scale special-shaped ring forging of 4340H steel according to claim 1 is characterized in that: described secondary base obtains the large scale special-shaped ring forging of 4340H steel after roll forming.Described rolling temperature is 1140 ℃ ~ 1200 ℃, deflection 〉=45%.
3. the blank-making method of the large scale special-shaped ring forging of 4340H steel according to claim 1, it is characterized in that: the core roller of described looping mill is combined by general core roller and special-purpose core roller.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104139147A (en) * | 2014-07-07 | 2014-11-12 | 贵州航天新力铸锻有限责任公司 | Forging method of SB564 UNS N06690 alloy large-scale internal T-shaped annular forge piece blank |
| CN105397417A (en) * | 2015-12-02 | 2016-03-16 | 贵州安大航空锻造有限责任公司 | Rolling method of high-temperature alloy plate shaped forging |
| CN107685222A (en) * | 2016-08-04 | 2018-02-13 | 南阳二机石油装备集团股份有限公司 | One kind rolles over the manufacture method of the seamless double-arm lifting-ring of ring (PSL2) |
| CN111085638A (en) * | 2019-12-23 | 2020-05-01 | 宝鸡石油机械有限责任公司 | Rolling forming method of T-shaped section full-fiber gear ring |
| CN114289677A (en) * | 2021-12-15 | 2022-04-08 | 陕西宏远航空锻造有限责任公司 | Rolling forming method for titanium alloy non-uniform-thickness special-shaped thin-wall ring piece |
| CN114406608A (en) * | 2021-12-23 | 2022-04-29 | 江苏保捷精锻有限公司 | Bearing ring grinding and expanding manufacturing process |
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| CN102703818A (en) * | 2012-06-11 | 2012-10-03 | 张家港海陆环形锻件有限公司 | Material for overweight ring forging and manufacturing process for ring forging |
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| RU2191088C2 (en) * | 2000-11-13 | 2002-10-20 | Открытое акционерное общество "Автонормаль" | Method of manufacturing bushing with outer annular member |
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| CN101618498A (en) * | 2009-07-17 | 2010-01-06 | 宁波安拓实业有限公司 | Manufacturing process of adjusting nut |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104139147A (en) * | 2014-07-07 | 2014-11-12 | 贵州航天新力铸锻有限责任公司 | Forging method of SB564 UNS N06690 alloy large-scale internal T-shaped annular forge piece blank |
| CN105397417A (en) * | 2015-12-02 | 2016-03-16 | 贵州安大航空锻造有限责任公司 | Rolling method of high-temperature alloy plate shaped forging |
| CN107685222A (en) * | 2016-08-04 | 2018-02-13 | 南阳二机石油装备集团股份有限公司 | One kind rolles over the manufacture method of the seamless double-arm lifting-ring of ring (PSL2) |
| CN111085638A (en) * | 2019-12-23 | 2020-05-01 | 宝鸡石油机械有限责任公司 | Rolling forming method of T-shaped section full-fiber gear ring |
| CN111085638B (en) * | 2019-12-23 | 2022-03-29 | 宝鸡石油机械有限责任公司 | Rolling forming method of T-shaped section full-fiber gear ring |
| CN114289677A (en) * | 2021-12-15 | 2022-04-08 | 陕西宏远航空锻造有限责任公司 | Rolling forming method for titanium alloy non-uniform-thickness special-shaped thin-wall ring piece |
| CN114406608A (en) * | 2021-12-23 | 2022-04-29 | 江苏保捷精锻有限公司 | Bearing ring grinding and expanding manufacturing process |
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Application publication date: 20131016 |