CN102513487A - Method for forging large-size integral titanium alloy frames - Google Patents
Method for forging large-size integral titanium alloy frames Download PDFInfo
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Abstract
The invention belongs to the technical field of forging, and relates to a method for forging large-size integral titanium alloy frames, which includes: the first step, designing a finish forge piece and an isothermal forging die according to materials, shapes and size of parts; the second step, designing a hammer pre-forging piece and a die drawing and keeping the size of a cavity of the pre-forging piece die and the size of a cavity of the isothermal forging die consistent; the third step, selecting pre-forging piece blank and making a finish forging die and a pre-forging die according to the first step and the second step; the fourth step, processing the blank by means of hammer pre-forging including coating protective lubricant, heating by an electric furnace, holding temperature, forging, subsequent process and the like; and the fifth step, processing the pre-forging piece by means of isothermal die-forging. The method realizes organic combination of hammer pre-forging and isothermal forging, so that the forging cycle is shortened and the heating number is reduced from 5-7 to 2 in isothermal forging.
Description
Technical field
The invention belongs to the forging field, relate to the forging method of the whole frame of a kind of large titanium alloy.
Background technology
The large titanium alloy forging is meant that generally weight surpasses 50kg, the forging of external diameter beyond 500mm.Along with high-speed development of science and technology, demand large-scale or ultra-large type whole titanium alloy frame isothermal finish forge spare is more and more.And most these forgings generally have architectural features such as high muscle is many, web thin, projected area is big.If directly adopt the molding mode of isothermal forging, need 5～7 fire to accomplish, and all will mill burr behind every fire, the production cycle long (only the mould heating-cooling just needs 8 days time), 1 forging isothermal forging cycle needs 12 day time; This has not only caused equipment, personnel attrition, has also reduced the service life of mould.
Summary of the invention
Technical problem to be solved by this invention is: propose the forging method of the whole frame of a kind of large titanium alloy, shorten the forging cycle of product, improve ratio of briquetting, improve the service life of mould.
Basic ideas of the present invention are through adopting hammer to go up the method for blocking and the combination of isothermal finish-forging, solving above-mentioned technical problem.The present invention specifically comprises following steps:
Step 1, according to material, shape, the size of part, design finish-forging forging and isothermal forging mould;
Step 2, design hammer is gone up blocking spare and die drawing, and its mould is consistent with isothermal forging mould cavity dimension when the finish-forging when blocking;
Step 3 according to step 1, step 2, is chosen blocking spare blank, and fabrication and processing is whole, the blocking mould;
Step 4: blank is hammered into shape blocking, comprise spraying protecting lubricant, electric furnace heating and insulation, forging and subsequent handling supervisor;
Step 5: the formed blocking spare of step 4 is carried out isothermal die forging process.
According to above-described forging method, in step 4, subsequent handling is milled burr and can be crossed and mill 1～2mm.
The present invention realizes that through said method hammer goes up the combination of blocking and isothermal forging, has shortened the forging cycle, and it is inferior to be reduced to 2 fire by 5～7 fire of isothermal forging, has improved production efficiency, has reduced production cost.
The specific embodiment
Following specific embodiments of the invention further specifies.
Step 1, according to material, shape, the size of part, design finish-forging forging and isothermal forging mould.
Architectural features such as the analysis part drawing comprises product parts contour dimension, and projected area, minimum/maximum thickness, muscle height and muscle are wide.According to part characteristics and size, we confirm the forging surplus, and surplus is littler by 30%～50% than conventional die forging.Make the forging digital-to-analogue by this scheme.
Do the mould digital-to-analogue according to the forging digital-to-analogue, mold materials is a high temperature alloy, and the forging material is a titanium alloy; According to the linear expansion coefficient of these two kinds of materials under different temperatures; Confirm the shrinkage factor of forging and mould respectively, finally calculate hot forging digital-to-analogue and mold cavity size, designing mould.
Step 2, design hammer is gone up blocking spare and die drawing, and its mould is consistent with isothermal forging mould cavity dimension when the finish-forging when blocking.
Analyze finish-forging figure, confirm blocking spare design.Be tissue and the performance requirement that satisfies final forging, the waste shape of blocking is when carrying out isothermal forging, and we choose the forging deflection and are controlled at 30%～40%, calculate blocking spare vertical dimension surplus with following formula:
L＝h×(1+k)-h
L-blocking spare vertical dimension surplus in the formula;
H-finish-forging spare gauge;
The deflection of k-forging when isothermal forging.
In order to guarantee smoothly waste shape to be put into die cavity, we adopt closed die forging blocking, and die joint is a curved surface, produce blocking number of packages mould.The forging mold material selects 5CrNiMo on the hammer, and forging material titanium alloy is confirmed the forging shrinkage factor.Finally calculate the mold cavity size, designing mould.
Step 3 according to step 1 and step 2, is chosen blocking spare blank, and fabrication and processing is whole, the blocking mould.Figure makes mould according to product design.
Step 4: hammer blocking into shape, comprise spraying protecting lubricant, electric furnace heating and insulation, forging and subsequent handling supervisor.
A) spraying protecting lubricant: clean blank is placed 100～150 ℃ electric furnace preheating 10～20 minutes, the spraying lubricant of coming out of the stove, coating is wanted evenly.
B) adopt electric furnace heating and insulation.
C) forge preheated mold before forging with the 630KJ counter-blow hammer.FMT requires: blank transfer time≤40s; During blocking blank is just put, touched 1～2 hammer earlier, the moulding of thumping again; Final forging temperature>=800 ℃; The type of cooling is an air cooling.
D) subsequent handling: mill burr, last fire is crossed and is milled burr 1～2mm; Corner angle and mistake are milled place's polishing slyness, and forging is all polished.
Step 5 is carried out isothermal forging to blocking spare, comprises following program:
A) spraying protecting lubricant: the spraying before with warm washing powder water with the blank scrub; The preheating blank, the spraying lubricant; Coating layer thickness 0.25～0.3mm is coated with the back air dry.
B) adopt electric furnace heating and insulation;
C) isothermal forging equipment adopts forcing press: mould is installed on the equipment, with electric furnace mould is heated.
D) isothermal die forging process: specification requirement: blank transfer time≤30 second; The blank that heats is put into the mould that is preheating to temperature forge and press, utilize computer system control to forge speed and forging vertical dimension during forging; Use the air cooling mode that forging is cooled off.
Repeating step 5 1～2 times.
Below in conjunction with embodiment the specific embodiment is described.
Case 1: forging material: TA15; 988 ℃ of transformation temperatures; Quantity: 4.
Step 1: according to material, shape, the size of part, design finish-forging forging and isothermal forging mould.
Analyze part drawing: product parts contour dimension is 1007 * 1096.5mm, and projected area is 0.38m
2, the thick 1.8～6mm of web, maximum ga(u)ge 160mm, 18 high 20mm of horizontal bar, wide 2mm.Product requirement isothermal finish forge spare.We confirm the monolateral 4～5mm of being of forging surplus according to these characteristics, and it is outer 3 ° that product goes out modular angle, interior 5 °.Make the forging digital-to-analogue.
Do die drawing according to forging drawing, mold materials is a high temperature alloy, and the forging material is a titanium alloy, according to the linear expansion coefficient of these two kinds of materials under forging temperature, confirms the shrinkage factor of forging and mould respectively, confirms that finally mold cavity is of a size of 99.66% of forging.
Step 2: design hammer is gone up blocking spare and die drawing, and its mould is consistent with isothermal forging mould cavity dimension when the finish-forging when blocking.
Analyze finish-forging figure, confirm blocking spare design, the monolateral surplus 3mm of forging horizontal direction; Being calculated and chosen the vertical dimension surplus by formula L=h * (1+k)-h is that (in the formula: L is a blocking spare vertical dimension surplus to 5mm; H is finish-forging spare gauge 12.5～16mm; K is the deflection 30%～40% of forging when isothermal forging).Forging adopts closed die forging, and die joint is a curved surface, produces blocking number of packages mould.The forging mold material selects 5CrNiMo on the hammer; The TA15 forging temperature is 30～50 ℃ down of T β (transformation temperature), and mold preheating temperature is 200～350 ℃, according to the thermal coefficient of expansion of these two kinds of material different temperatures; Confirm that the forging shrinkage factor is 100.7%, promptly mold cavity is of a size of 100.7% of forging.Designing mould figure.
Step 3: according to step 1 and step 2, choose blocking spare blank, fabrication and processing is whole, the blocking mould.Figure makes mould according to product design.
Step 4: hammer blocking into shape.Comprise spraying protecting lubricant, electric furnace heating and insulation, forging and subsequent handling supervisor.
A) spraying protecting lubricant: clean blank is placed 150 ℃ electric furnace preheating 20 minutes, the spraying lubricant of coming out of the stove, coating is wanted evenly, and it is former underlined to be coated with the back marking.
B) electric furnace heating, 958 ℃ of heating-up temperatures are incubated 70 minutes.
C) forge to adopt the 630KJ counter-blow hammer, forging front mold preheating time is 12h, and FMT requires: blank transfer time 20～35; During blocking blank is just put, touched 2 hammers earlier, the moulding of thumping again; Final forging temperature is 805～812 ℃; The type of cooling is an air cooling.
D) subsequent handling: mill burr, last fire is crossed and is milled burr 1～2mm; Corner angle and mistake are milled place's polishing slyness, and forging is all polished.
Step 5 is carried out isothermal forging to blocking spare, comprises following program:
A) spraying protecting lubricant: the spraying before with warm washing powder water with the blank scrub;
Blank heats 10min in 150 ℃ of furnace temperature, come out of the stove with the watering can spraying, and coating layer thickness 0.25～0.3mm is coated with the back air dry; Lubricant is selected KBC-12 for use.
B) electric furnace heating, 958 ℃ of forging heating-up temperatures are incubated 70 minutes;
C) isothermal forging adopts 10000 tons of hydraulic presses: mould is installed on the equipment, with Rotary Electric Furnace mould is heated;
D) isothermal die forging process specification requirement: blank 25s transfer time; The blank that heats is put into the mould that is preheating to temperature forge and press, utilize computer system control to forge speed and forging vertical dimension during forging.The forging and pressing parameter is set: different according to compression area and different each the fire time pressure of full level, maximum is set at 4000 tons; Forge speed (equipment crossbeam speed): 0.001～0.005mm/s; First fire: the compacting blank makes blank integral body contact with mould; Drafts 10.0mm; Second fire: drafts 5.0mm; Forging is cooled to the air cooling mode.
Repeating step 51 times.
Claims (2)
1. the forging method of the whole frame of large titanium alloy is characterized by, and said method comprises hammer and goes up blocking and isothermal forging finish-forging, specifically may further comprise the steps:
Step 1, according to material, shape, the size of part, design finish-forging forging and isothermal forging mould;
Step 2, design hammer is gone up blocking spare and die drawing, and its mould is consistent with isothermal forging mould cavity dimension when the finish-forging when blocking;
Step 3 according to step 1, step 2, is chosen blocking spare blank, and fabrication and processing is whole, the blocking mould;
Step 4: blank is hammered into shape blocking, comprise spraying protecting lubricant, electric furnace heating and insulation, forging and subsequent handling supervisor;
Step 5: the formed blocking spare of step 4 is carried out isothermal die forging process.
2. forging method according to claim 1, its characteristic also is: in step 4, it was to mill 1～2mm that subsequent handling is milled burr.
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103962487A (en) * | 2014-04-08 | 2014-08-06 | 中国航空工业集团公司北京航空材料研究院 | Large-scale solid-forging metal framework with lugs and manufacturing method thereof |
| CN104646578A (en) * | 2013-12-31 | 2015-05-27 | 中国航空工业集团公司沈阳飞机设计研究所 | Isothermal forging method for titanium alloy whole frame-shaped piece |
| CN104785691A (en) * | 2015-04-14 | 2015-07-22 | 太原科技大学 | Closed die forging precise forming method for bulkhead forge piece |
| CN104785692A (en) * | 2015-04-14 | 2015-07-22 | 太原科技大学 | Method for determining shape and dimension of bulkhead forging thickness-variable slab |
| CN104801644A (en) * | 2015-04-14 | 2015-07-29 | 太原科技大学 | Pre-forming mold and method of variable-thickness plate blank of separation frame forge element |
| CN105215245A (en) * | 2015-10-16 | 2016-01-06 | 西安三角航空科技有限责任公司 | A kind of forging method of ultra-large type whole titanium alloy frame forging |
| CN105436373A (en) * | 2015-10-14 | 2016-03-30 | 中国航空工业集团公司北京航空材料研究院 | Nickel-based powder high-temperature alloy ingot superplastic isothermal closed upset cake blank making method |
| CN105728612A (en) * | 2014-12-12 | 2016-07-06 | 陕西宏远航空锻造有限责任公司 | Forging method of large titanium alloy frame class precision forge piece for aviation aircraft |
| CN108526365A (en) * | 2018-05-30 | 2018-09-14 | 西安三角防务股份有限公司 | A kind of forging forming method of large titanium alloy center piece |
| CN108526381A (en) * | 2018-05-22 | 2018-09-14 | 西安三角防务股份有限公司 | A kind of forging method of ultra-large type aluminum matrix composite ring |
| CN109604511A (en) * | 2019-01-15 | 2019-04-12 | 苏州市东盛锻造有限公司 | Threeway forging process for fuel method and its product |
| CN109773096A (en) * | 2018-12-11 | 2019-05-21 | 陕西宏远航空锻造有限责任公司 | It is a kind of to improve flaw detection horizontal forging method and device |
| CN110814251A (en) * | 2019-11-14 | 2020-02-21 | 西安三角防务股份有限公司 | Forging method of large TC18 titanium alloy die forging for landing gear |
| CN112439856A (en) * | 2021-01-05 | 2021-03-05 | 江苏南洋中京科技有限公司 | Hot extrusion method for forging blank |
| CN112872261A (en) * | 2020-12-24 | 2021-06-01 | 陕西宏远航空锻造有限责任公司 | Forging method of titanium alloy flange plate forge piece |
| CN113510208A (en) * | 2020-04-09 | 2021-10-19 | 陕西长羽航空装备有限公司 | Local die forging and rolling combined forming method for titanium alloy T-shaped section ring piece |
| CN113828714A (en) * | 2021-09-22 | 2021-12-24 | 中国第二重型机械集团德阳万航模锻有限责任公司 | Method for forging super-large titanium alloy whole frame |
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| CN104646578A (en) * | 2013-12-31 | 2015-05-27 | 中国航空工业集团公司沈阳飞机设计研究所 | Isothermal forging method for titanium alloy whole frame-shaped piece |
| CN103962487A (en) * | 2014-04-08 | 2014-08-06 | 中国航空工业集团公司北京航空材料研究院 | Large-scale solid-forging metal framework with lugs and manufacturing method thereof |
| CN103962487B (en) * | 2014-04-08 | 2016-08-17 | 中国航空工业集团公司北京航空材料研究院 | A kind of large-scale solid forging metal framework of band ear block and preparation method thereof |
| CN105728612A (en) * | 2014-12-12 | 2016-07-06 | 陕西宏远航空锻造有限责任公司 | Forging method of large titanium alloy frame class precision forge piece for aviation aircraft |
| CN104785691A (en) * | 2015-04-14 | 2015-07-22 | 太原科技大学 | Closed die forging precise forming method for bulkhead forge piece |
| CN104785692A (en) * | 2015-04-14 | 2015-07-22 | 太原科技大学 | Method for determining shape and dimension of bulkhead forging thickness-variable slab |
| CN104801644A (en) * | 2015-04-14 | 2015-07-29 | 太原科技大学 | Pre-forming mold and method of variable-thickness plate blank of separation frame forge element |
| CN105436373A (en) * | 2015-10-14 | 2016-03-30 | 中国航空工业集团公司北京航空材料研究院 | Nickel-based powder high-temperature alloy ingot superplastic isothermal closed upset cake blank making method |
| CN105215245A (en) * | 2015-10-16 | 2016-01-06 | 西安三角航空科技有限责任公司 | A kind of forging method of ultra-large type whole titanium alloy frame forging |
| CN105215245B (en) * | 2015-10-16 | 2019-08-20 | 西安三角航空科技有限责任公司 | A kind of forging method of super large Type Titanium Alloy entirety frame forging |
| CN108526381A (en) * | 2018-05-22 | 2018-09-14 | 西安三角防务股份有限公司 | A kind of forging method of ultra-large type aluminum matrix composite ring |
| CN108526381B (en) * | 2018-05-22 | 2020-12-18 | 西安三角防务股份有限公司 | Forging method of ultra-large aluminum-based composite ring piece |
| CN108526365A (en) * | 2018-05-30 | 2018-09-14 | 西安三角防务股份有限公司 | A kind of forging forming method of large titanium alloy center piece |
| CN109773096A (en) * | 2018-12-11 | 2019-05-21 | 陕西宏远航空锻造有限责任公司 | It is a kind of to improve flaw detection horizontal forging method and device |
| CN109604511A (en) * | 2019-01-15 | 2019-04-12 | 苏州市东盛锻造有限公司 | Threeway forging process for fuel method and its product |
| CN110814251A (en) * | 2019-11-14 | 2020-02-21 | 西安三角防务股份有限公司 | Forging method of large TC18 titanium alloy die forging for landing gear |
| CN113510208A (en) * | 2020-04-09 | 2021-10-19 | 陕西长羽航空装备有限公司 | Local die forging and rolling combined forming method for titanium alloy T-shaped section ring piece |
| CN112872261A (en) * | 2020-12-24 | 2021-06-01 | 陕西宏远航空锻造有限责任公司 | Forging method of titanium alloy flange plate forge piece |
| CN112439856A (en) * | 2021-01-05 | 2021-03-05 | 江苏南洋中京科技有限公司 | Hot extrusion method for forging blank |
| CN113828714A (en) * | 2021-09-22 | 2021-12-24 | 中国第二重型机械集团德阳万航模锻有限责任公司 | Method for forging super-large titanium alloy whole frame |
| CN113828714B (en) * | 2021-09-22 | 2023-11-28 | 中国第二重型机械集团德阳万航模锻有限责任公司 | Forging method for extra-large titanium alloy whole frame |
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Application publication date: 20120627 |