CN108372215B - Forming method for precise thermal bulging of titanium alloy conical barrel part - Google Patents
Forming method for precise thermal bulging of titanium alloy conical barrel part Download PDFInfo
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- CN108372215B CN108372215B CN201611183009.6A CN201611183009A CN108372215B CN 108372215 B CN108372215 B CN 108372215B CN 201611183009 A CN201611183009 A CN 201611183009A CN 108372215 B CN108372215 B CN 108372215B
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- annular blank
- blank
- expansion valve
- bulging
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
- B21D1/06—Removing local distortions
- B21D1/08—Removing local distortions of hollow bodies made from sheet metal
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/16—Heating or cooling
Abstract
The invention provides a method for forming a titanium alloy conical barrel part by precise thermal bulging, which is technically characterized by comprising the following steps of: the forming method of the precise thermal bulging of the titanium alloy conical barrel comprises five steps, wherein a die in the forming method comprises a bulging core, a limiting block is connected to the bulging core, a bulging lobe is connected to the outer portion of the bulging core, a bottom plate is arranged at the bottom of the die, a pin rod hole is formed in the bottom plate, a pin rod penetrates through the pin rod hole, and one end of the pin rod is connected with the bulging lobe; the invention can simplify the process flow, reduce one-time thermal cycle and surface treatment, reduce the material peroxidation failure and hydrogen increasing risks, improve the product reliability and production efficiency, reduce the equipment resource and hot press die cost investment, directly determine the number of welding seams of the part by the plate width size of the annular blank, is not limited by the forming process, reduce the number of the welding seams to the maximum extent, obviously improve the mechanical property of the part, reduce the welding process risk and the auxiliary tailor welding tooling cost investment because the bus of the conical annular blank is a straight line segment and the tailor welding is straight seam welding.
Description
Technical Field
The invention relates to the technical field of metal plate hot forming, in particular to a forming method for precise hot bulging of a titanium alloy conical barrel part.
Background
Titanium alloy cone cylinder parts with the outer diameter of 600-1000mm and the wall thickness of 1.0-3.0mm are mainly used for the outer wall of the combustion chamber of the aero-engine, and are usually designed into cone-shaped annular components with the generatrix in the shape of a straight line, a curve and other multi-line combination, and the manufacturing precision requirement is high due to the assembly requirement. At present, the prior art has no integral manufacturing process for the large-size titanium alloy conical barrel part, the mature manufacturing process is to divide the conical barrel part into a plurality of halves, split hot press forming is firstly carried out, then the split hot press forming is carried out, an integral annular blank is welded, and finally the part is hot-formed to the size which is actually required through the thermal expansion effect of a fixed split bulging mold.
For a larger-size titanium alloy cone-shaped part, in order to ensure the split hot-press forming quality, the larger the number of the split parts is, the more the number of the welding seams is, and the worse the mechanical property of the part is. The welding edge dislocation of the blank after split forming is not more than 0.1 delta when the blank is subjected to butt welding and butt joint, delta is the thickness of an original base material, otherwise, the quality of a welding seam is directly influenced, the requirement of the split welding on the conformity rate of the profile of the blank after split hot pressing is higher, and therefore the problems of large manufacturing process risk, high manufacturing cost, poor part mechanical property and the like of a large-size titanium alloy conical barrel part cannot be well solved in the prior art.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a method for forming a titanium alloy conical barrel part by precise hot bulging.
A method for forming a titanium alloy conical barrel part by precise thermal bulging,
designing the size of an annular blank according to a material forming limit principle, determining the number of divided petals of the annular blank according to the amplitude of a titanium alloy original plate, manufacturing limiting holes in the annular blank in a blanking process, and manufacturing the divided blank into the annular blank through a roll bending process and a tailor welding process;
secondly, respectively and uniformly coating anti-oxidation coatings on the inner surface and the outer surface of the annular blank, respectively and uniformly coating liquid graphite on the outer surface of the expansion core, the bottom of the expansion valve and the inner and outer molded surfaces of the expansion valve, and then naturally drying the expansion core and the expansion valve;
thirdly, sleeving the annular blank on the outer surface of the expansion valve, matching the position of a limiting hole arranged on the annular blank with the position of a pin plate hole on the bottom plate and fixing the limiting hole by using a pin rod, and installing the expansion core into the expansion valve to support the expansion valve;
fourthly, the mould filled with the annular blank is arranged in hot-pressing equipment, a thermocouple is inserted into the bottom plate, a furnace door is closed, a target heating temperature is set, and a heating system of the hot-pressing equipment is started;
and fifthly, when the temperature of the mold displayed by the hot-pressing equipment reaches the target heating temperature range, starting the hot-pressing equipment to pressurize the mold, observing the closing height of the mold on an operation table, continuously pressurizing to 20t-40t and keeping the height of the mold unchanged, keeping the temperature and the pressure for 10min-40min, stopping pressurizing and unloading, closing a heating system of the hot-pressing equipment, and cooling along with the furnace.
Further, the target heating temperature is 600-800 ℃.
Further, the first step further includes designing a titanium alloy cone blank, the titanium alloy cone blank is designed to be a cone-shaped annular blank with a bus as a straight line segment, the outer diameter of the upper port and the outer diameter of the lower port of the annular blank are adjusted according to a material forming limit principle, so that the maximum deformation rate of the annular blank when the annular blank expands to the cone is smaller than the maximum elongation rate allowed by the material, the cone-shaped annular blank is unfolded into a fan-shaped blank through calculation of a geometric formula, and the number of the fan-shaped blank divided pieces, namely the split blank, is determined according to the amplitude of the original titanium alloy plate.
Further, the dimensions of the conical ring-shaped blank are subject to design principles
K is the maximum elongation allowed by the material, dx is the external diameter of any section of the annular blank, and dy is the external diameter of the same section of the conical barrel part and the annular blank.
Further, the mould is connected with the stopper including the core that expands on the core that expands, and the external connection of the core that expands has the lamella that expands, and the bottom of mould is provided with the bottom plate, is provided with the round pin pole hole on the bottom plate, and the downthehole pin pole that has of pin pole passes, and the lamella that expands is connected to the one end of pin pole.
Furthermore, the expansion core, the expansion valve and the bottom plate are of a revolving body structure, the expansion valve is uniform and multi-valve coaxial, and the expansion valve horizontally and radially slides when the expansion core vertically moves downwards under the action of external force.
The invention has the advantages that:
1. the process flow is simplified, one-time thermal cycle and surface treatment are reduced, the risks of material peroxidation failure and hydrogen increase are reduced, the reliability and production efficiency of products are improved, and the equipment resource and hot-pressing die cost input are reduced;
2. the number of the welding seams of the part is directly determined by the plate width size of the annular blank, is not limited by a forming process, can reduce the number of the welding seams to the maximum extent, and obviously improves the mechanical property of the part;
3. the bus of the conical annular blank is a straight line segment, and the tailor welding is straight seam welding, so that the welding process risk and the cost input of an auxiliary tailor welding tool are reduced;
4. the sliding type split thermal expansion die is utilized to realize the one-time thermal expansion in-place of the part, and the part forming precision is higher.
Drawings
FIG. 1 is a schematic diagram of the structure of a mold;
fig. 2 is a schematic view of the bulging of the annular blank to the cone element.
The labels in the figures are:
1. expansion core
2. Limiting block
3. Expansion valve
4. Pin rod
5. A base plate.
Detailed Description
In order that the invention may be more clearly understood, the following detailed description of the embodiments of the invention is given with reference to the accompanying drawings.
Example 1
As shown in fig. 1-2, a method for forming a titanium alloy conical barrel part by precision thermal bulging, comprises a first step of designing the size of an annular blank according to a material forming limit principle, determining the number of divided sections of the annular blank according to the amplitude of an original titanium alloy plate, manufacturing limiting holes arranged on the annular blank in a blanking process, manufacturing the divided blank into the annular blank by a roll bending process and a tailor welding process, wherein the roll bending process and the tailor welding process adopt the prior art; secondly, respectively and uniformly coating anti-oxidation coatings on the inner surface and the outer surface of the annular blank, respectively and uniformly coating liquid graphite on the outer surface of the expansion core 1, the bottom of the expansion valve 3 and the inner and outer molded surfaces of the expansion valve 3, and then naturally drying; thirdly, sleeving an annular blank on the outer surface of the expansion valve 3, matching the position of a limiting hole arranged on the annular blank with the position of a pin plate hole on a bottom plate 5, and fixing the limiting hole by using a pin rod 4, and arranging the expansion core 1 in the expansion valve 3 to support the expansion valve 3; fourthly, the mould filled with the annular blank is arranged in hot-pressing equipment, a thermocouple is inserted into the bottom plate 5, a furnace door is closed, a target heating temperature is set, and a heating system of the hot-pressing equipment is started; fifthly, when the temperature of the die displayed by the hot-pressing equipment reaches the target heating temperature range, the target heating temperature is 600-800 ℃, the hot-pressing equipment is started to pressurize the die, the closing height of the die is observed on an operation table, the pressure is continuously increased to 20-40 t, and the height of the die is not changed any more, the pressurization is stopped and the unloading is carried out after the temperature and the pressure are kept for 10-40 min, the heating system of the hot-pressing equipment is closed, and the die is cooled along with the furnace.
Further, the mould is connected with stopper 2 including bloated core 1 on the core 1 that expands, and the external connection of bloated core 1 has bloated lamella 3, and the bottom of mould is provided with bottom plate 5, is provided with the round pin pole hole on the bottom plate 5, and the downthehole pin pole 4 that has of round pin pole passes, and bloated lamella 3 is connected to the one end of round pin pole 4.
Example 2
As shown in figure 1-2, a titanium alloy cone tube precision thermal bulging forming method, the first step, according to the material forming limit principle design the size of the ring blank, according to the original plate amplitude of the titanium alloy determine the ring blank divided the number of the valve, the ring blank set the limit hole in the blanking process to make, the valve blank through the roll bending process and the welding process to make the ring blank, the roll bending process and the welding process use the existing technology, also includes the titanium alloy cone tube blank design, the titanium alloy cone tube blank design for titanium alloy cone tube blank for the bus line for the straight line cone ring blank, according to the material forming limit principle adjust the annular blank upper port and lower port outside diameter size, the annular blank bulging to cone tube maximum deformation rate is less than the material allowed maximum elongation rate, through the geometric formula calculation cone blank into the fan blank, and determining the number of the segmented pieces of the fan-shaped blank, namely the segmented blank according to the amplitude of the original titanium alloy plate. The size of the conical annular blank is designed according to the principle that
K is the maximum elongation allowed by the material, dx is the external diameter of any section of the annular blank, and dy is the external diameter of the same section of the conical barrel part and the annular blank; secondly, respectively and uniformly coating anti-oxidation coatings on the inner surface and the outer surface of the annular blank, respectively and uniformly coating liquid graphite on the outer surface of the expansion core 1, the bottom of the expansion valve 3 and the inner and outer molded surfaces of the expansion valve 3, and then naturally drying; thirdly, sleeving an annular blank on the outer surface of the expansion valve 3, matching the position of a limiting hole arranged on the annular blank with the position of a pin plate hole on a bottom plate 5, and fixing the limiting hole by using a pin rod 4, and arranging the expansion core 1 in the expansion valve 3 to support the expansion valve 3; fourthly, the mould filled with the annular blank is arranged in hot-pressing equipment, a thermocouple is inserted into the bottom plate 5, a furnace door is closed, a target heating temperature is set, and a heating system of the hot-pressing equipment is started; fifthly, when the temperature of the die displayed by the hot-pressing equipment reaches the target heating temperature range, the target heating temperature is 600-800 ℃, the hot-pressing equipment is started to pressurize the die, the closing height of the die is observed on an operation table, the pressure is continuously increased to 20-40 t, and the height of the die is not changed any more, the pressurization is stopped and the unloading is carried out after the temperature and the pressure are kept for 10-40 min, the heating system of the hot-pressing equipment is closed, and the die is cooled along with the furnace.
Further, the mould is including expanding core 1, be connected with stopper 2 on the core 1 that expands, the external connection of core 1 that expands has the lamella 3 that expands, the bottom of mould is provided with bottom plate 5, bottom plate 5 is annular bottom plate, be provided with the round pin pole hole on the bottom plate 5, round pin pole downthehole round pin pole 4 that has passes, the lamella 3 that expands is connected to the one end of round pin pole 4, core 1 that expands is the revolution solid structure with the lamella 3 that expands and bottom plate 5, the lamella 3 that expands is even multilobe coaxial, expand the lamella 3 horizontal radial slip of lamella when the vertical downstream of core 1 that expands during exogenic action
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (3)
1. A forming method for precise thermal bulging of a titanium alloy conical barrel part is characterized by comprising the following steps: the used mold comprises an expansion core, a limiting block is connected to the expansion core, an expansion valve is connected to the outer portion of the expansion core, a bottom plate is arranged at the bottom of the mold, a pin rod hole is formed in the bottom plate, a pin rod penetrates through the pin rod hole, and one end of the pin rod is connected with the expansion valve, and the method comprises the following steps:
the method comprises the steps that firstly, a titanium alloy conical barrel blank is designed into a conical annular blank with a straight line section as a bus, the outer diameter of an upper port and a lower port of the annular blank is adjusted according to a material forming limit principle, so that the maximum deformation rate of the annular blank when the annular blank is expanded to the conical barrel is smaller than the maximum elongation rate allowed by a material, the conical annular blank is unfolded into a fan-shaped blank through calculation of a geometric formula, the number of segmented petals of the annular blank is determined according to the amplitude of an original titanium alloy plate, limiting holes formed in the annular blank are manufactured in a blanking process, and the segmented blank is manufactured into the annular blank through a roll bending process and a tailor welding process;
the dimensions of the conical ring-shaped blank are subject to the design principle
K is the maximum elongation allowed by the material, dx is the external diameter of any section of the annular blank, and dy is the external diameter of the same section of the conical barrel part and the annular blank;
secondly, respectively and uniformly coating anti-oxidation coatings on the inner surface and the outer surface of the annular blank, respectively and uniformly coating liquid graphite on the outer surface of the expansion core, the bottom of the expansion valve and the inner and outer molded surfaces of the expansion valve, and then naturally drying the expansion core and the expansion valve;
thirdly, sleeving the annular blank on the outer surface of the expansion valve, matching the position of a limiting hole arranged on the annular blank with the position of a pin plate hole on the bottom plate and fixing the limiting hole by using a pin rod, and installing the expansion core into the expansion valve to support the expansion valve;
fourthly, the mould filled with the annular blank is arranged in hot-pressing equipment, a thermocouple is inserted into the bottom plate, a furnace door is closed, a target heating temperature is set, and a heating system of the hot-pressing equipment is started;
and fifthly, when the temperature of the mold displayed by the hot-pressing equipment reaches the target heating temperature range, starting the hot-pressing equipment to pressurize the mold, observing the closing height of the mold on an operation table, continuously pressurizing to 20t-40t and keeping the height of the mold unchanged, keeping the temperature and the pressure for 10min-40min, stopping pressurizing and unloading, closing a heating system of the hot-pressing equipment, and cooling along with the furnace.
2. The method for forming the titanium alloy conical barrel part by the precise hot bulging according to claim 1, wherein the method comprises the following steps: the target heating temperature is 600-800 ℃.
3. The method for forming the titanium alloy conical barrel part by the precise hot bulging according to claim 1, wherein the method comprises the following steps: the expansion core, the expansion valve and the bottom plate are of a revolving body structure, the expansion valve is uniform and multi-valve coaxial, and the expansion valve horizontally and radially slides when the expansion core vertically moves downwards under the action of external force.
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| CN201611183009.6A CN108372215B (en) | 2016-12-20 | 2016-12-20 | Forming method for precise thermal bulging of titanium alloy conical barrel part |
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| CN201611183009.6A CN108372215B (en) | 2016-12-20 | 2016-12-20 | Forming method for precise thermal bulging of titanium alloy conical barrel part |
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| CN108372215B true CN108372215B (en) | 2020-07-07 |
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| CN110743979B (en) * | 2019-11-26 | 2020-10-16 | 中国航发沈阳黎明航空发动机有限责任公司 | Thermal bulging die for arc-shaped concave surface of titanium alloy thin-wall cylindrical part and working method |
| CN111644556B (en) * | 2020-06-12 | 2021-12-07 | 无锡派克新材料科技股份有限公司 | Manufacturing method of Ti64 alloy casing forging inclined-plane ring blank |
| CN113102868B (en) * | 2021-04-20 | 2023-02-28 | 中国直升机设计研究所 | Helicopter main nozzle lobe machining method |
| CN113245451B (en) * | 2021-06-09 | 2022-02-11 | 索罗曼(常州)合金新材料有限公司 | Method for producing titanium alloy large-caliber square thin-walled tube |
| CN113770647A (en) * | 2021-08-12 | 2021-12-10 | 上海航天精密机械研究所 | Vacuum thermoforming method for titanium alloy variable-curve bus spray pipe |
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| JPS587376B2 (en) * | 1978-09-27 | 1983-02-09 | 日本金属株式会社 | Foil ring manufacturing method |
| CN102009565A (en) * | 2010-11-03 | 2011-04-13 | 杭州润德车轮制造有限公司 | Steel ring integral wheel rim |
| CN102489596B (en) * | 2011-11-24 | 2014-04-02 | 贵州安大航空锻造有限责任公司 | Hot bulging method for forming rectangular titanium alloy rolled ring into special-shaped ring |
| CN102500706B (en) * | 2011-11-24 | 2014-02-05 | 贵州安大航空锻造有限责任公司 | Method for thermally bulging special titanium alloy ring rolled member |
| CN102873513B (en) * | 2012-09-29 | 2016-01-13 | 北京航星机器制造公司 | The gas expansion forming method of a kind of aluminium alloy large size, thin walled ball section covering |
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