CN109967619B - One-step hot-press forming die for large-curvature and variable-section titanium alloy skin - Google Patents
One-step hot-press forming die for large-curvature and variable-section titanium alloy skin Download PDFInfo
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- CN109967619B CN109967619B CN201711466097.5A CN201711466097A CN109967619B CN 109967619 B CN109967619 B CN 109967619B CN 201711466097 A CN201711466097 A CN 201711466097A CN 109967619 B CN109967619 B CN 109967619B
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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
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/20—Deep-drawing
- B21D22/22—Deep-drawing with devices for holding the edge of the blanks
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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
- B21D37/10—Die sets; Pillar guides
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- Shaping Metal By Deep-Drawing, Or The Like (AREA)
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Abstract
The invention provides a one-step hot-press forming die for a large-curvature and variable-section titanium alloy skin, and belongs to the technical field of titanium alloy material forming. The die only consists of a male die and a female die, and is not provided with a blank holder positioned in the middle layer; the outer side of the male die is provided with a blank pressing edge, the inner part of the male die is provided with a profile area, and the height of the profile area is lower than that of the blank pressing edge on the outer side. The die is suitable for one-time hot press forming of the titanium alloy skin with large curvature and variable cross section. The method has the characteristics of improving the forming efficiency of the titanium alloy part with large curvature and variable cross section, and the like.
Description
Technical Field
The invention relates to a one-time hot-press forming die for a large-curvature and variable-section titanium alloy skin, and belongs to the technical field of titanium alloy material forming.
Background
At present, the hot forming mode of a titanium alloy sheet metal part with large curvature and variable cross section is to adopt a hot press forming machine with a top cylinder, and to manufacture a die comprising an upper layer, a middle layer and a lower layer, namely a die with a blank holder to apply blank holder force to the sheet metal in advance to realize the hot press forming of the part. Most of the existing hot press forming machines only comprise an upper platform and a lower platform, do not comprise a top cylinder, and only can carry out hot pressing on a die consisting of a male die and a female die, but not a die with a pressing edge ring. If the hot press forming machine is modified, a large amount of labor and money are consumed, and if new equipment with the jacking cylinder is introduced again, huge expenses are caused.
Disclosure of Invention
The invention provides a one-step hot-press forming die for a titanium alloy skin with large curvature and variable cross section, aiming at solving the problem that the existing titanium alloy sheet metal part forming machine with large curvature and variable cross section can not carry out hot pressing on a die with a side ring, and adopting the following technical scheme:
a one-time hot-press forming die for a titanium alloy skin with large curvature and variable cross section only comprises a male die and a female die, and is free of a blank holder in a middle layer; the outer side of the male die is provided with a blank holder, the inner part of the male die is provided with a profile area, and the height of the profile area is lower than that of the blank holder at the outer side; the molded surface of the inner side of the blank holder is the same as the molded surface of the part; the female die is wrapped inside the male die blank holder after die assembly; and a gap is formed between the outer side of the female die and the inner side of the blank holder.
Further, the forming method of the die hot press forming is that the male die and the female die are designed into dies capable of generating blank holder force, the plate is clamped in advance through the die assembly of the female die and the male die, the plate is always in a clamping state in the process of continuing die assembly, the blank holder effect is achieved, then the blanking size is accurately calculated through the part to be formed, the process end of the part is reduced, the phenomenon that the plate is stacked when the process end is too large is avoided, and wrinkles generated in the part forming process are prevented.
Further, the forming method comprises the following specific steps:
the method comprises the following steps: calculating the size of the titanium alloy spreading material to be calculated by adopting an approximate calculus grid drawing method according to the external dimension of the part to be formed, and obtaining the titanium alloy spreading material with the size required by the part to be formed;
step two: determining a process end of the part to be molded according to the height of the part to be molded, and processing the process end to form a saw-tooth shape;
step three: placing the titanium alloy spread material obtained in the step one on a part forming male die, and closing an upper die and a lower die of the die;
step four: carrying out hot pressing treatment on the titanium alloy expanded material, and enabling the titanium alloy expanded material to be in a compressed state all the time in the hot pressing process;
step five: and forming the titanium alloy skin with large curvature and variable cross section.
Further, the process end is 10 mm; if the height of the part to be molded is lower than 60mm, enlarging the process end to 20 mm; if the height of the part to be molded is higher than 200 mm; the process end is shortened to 6 mm.
The invention has the beneficial effects that:
the design of the one-time hot-press forming die mechanism for the titanium alloy skin with the large curvature and the variable cross section does not need to introduce a novel hot-press forming machine with a top cylinder again, so that the capital investment is greatly reduced; meanwhile, compared with a die with a blank holder, the blanking size is obviously reduced, and the input cost of the plate can be effectively reduced. The one-time hot-press forming die for the titanium alloy skin with the large curvature and the variable cross section can effectively avoid wrinkles during part forming, can reduce the wrinkle rate to 0.2%, effectively improves the finished product rate of manufactured workpieces, and improves the quality and efficiency of workpiece production.
Drawings
FIG. 1 is a diagram of a titanium alloy skin sheet metal part with large curvature and variable cross section.
FIG. 2 is a drawing of part blanking.
FIG. 3 is a front view structure diagram of a one-step hot press forming die for a titanium alloy skin with large curvature and variable cross section according to the invention.
FIG. 4 is a side view structural diagram of a one-time hot press forming die for a large-curvature and variable-section titanium alloy skin according to the invention.
FIG. 5 is a first schematic view of a hot pressing process according to the present invention.
FIG. 6 is a second schematic view of the hot pressing process of the present invention.
FIG. 7 is a third schematic view of the hot pressing process of the present invention.
FIG. 8 is a fourth schematic view of the hot pressing process of the present invention.
Detailed Description
The present invention will be further described with reference to the following specific examples, but the present invention is not limited to these examples.
Example 1:
as shown in fig. 1 to 8, the primary hot-press forming die for the titanium alloy skin with the large curvature and the variable cross section only consists of a male die and a female die, and has no blank holder in the middle layer; the outer side of the male die is provided with a blank holder, the inner part of the male die is provided with a profile area, and the height of the profile area is lower than that of the blank holder at the outer side; the molded surface of the inner side of the blank holder is the same as the molded surface of the part; the female die is wrapped inside the male die blank holder after die assembly; and a gap is formed between the outer side of the female die and the inner side of the blank holder.
The forming method of the die hot press forming comprises the steps of clamping a plate material in advance through the die assembly of a female die and a male die, enabling the plate material to be in a clamping state all the time in the process of continuing die assembly, further achieving the edge pressing effect, accurately calculating the blanking size through a part to be formed, reducing the process end of the part, avoiding the phenomenon that the plate material is stacked when the process end is too large, and preventing wrinkles generated in the forming process of the part.
The forming method comprises the following specific steps:
the method comprises the following steps: calculating the size of the titanium alloy spreading material to be calculated by adopting an approximate calculus grid drawing method according to the external dimension of the part to be formed, and obtaining the titanium alloy spreading material with the size required by the part to be formed;
step two: determining a process end of the part to be molded according to the height of the part to be molded, and processing the process end to form a saw-tooth shape;
step three: placing the titanium alloy spread material obtained in the step one on a part forming male die, and closing an upper die and a lower die of the die;
step four: carrying out hot pressing treatment on the titanium alloy expanded material, and enabling the titanium alloy expanded material to be in a compressed state all the time in the hot pressing process;
step five: and forming the titanium alloy skin with large curvature and variable cross section.
The process end is 10 mm; if the height of the part to be molded is lower than 60mm, enlarging the process end to 20 mm; if the height of the part to be molded is higher than 200 mm; the process end is shortened to 6 mm.
Example 2
During the forming process of the large-curvature and variable-section titanium alloy part, firstly, the unfolding material is accurately calculated in a grid drawing mode similar to calculus according to the overall dimension of the part, and after the unfolding material is calculated, the process end of the part is reduced as much as possible on the basis of ensuring accurate positioning and avoiding the generation of waste parts. If the height of the part is small, a process end needs to be additionally arranged, so that the plate is always in a clamping state in the hot pressing process, but the process end of the plate needs to be processed and is in a sawtooth shape, and the plate is prevented from being stacked to form wrinkles. Finally, the die is not bent after being completely closed, and the bent edge in the hot pressing process is completely converted into a vertical edge because the clearance of the concave-convex die for pressing the edge is small.
The mould is designed to have a structure form of an enclosing wall (edge pressing), the inner side of the edge pressing is the same as the molded surface of a forming area, and a corresponding forming line is obtained in a biased mode, so that the part can be uniformly stressed in the forming process, the stress direction is similar to the tangential direction of the forming line, the part is uniformly fed, and wrinkles are prevented from being generated.
The gap between the inner side of the blank holder and the outer side of the female die is controlled by the thickness of the plate, the gap is adjusted on the basis of considering the reduction amount of the plate, the friction force is measured and calculated through different extrusion forces, and then the friction force is compared with the tensile strength of the plate at the temperature, so that the optimal distance is obtained on the basis of avoiding the plate from being broken.
Example 3
In the process of forming a large-curvature and variable-section titanium alloy part, as shown in figure 1, firstly, the expanded material of the part is accurately calculated in a calculus mode, and a process end of the part is given according to the height of the part. If the height of the part is lower and the process end is properly enlarged, the part is always in a clamping state in the forming process. If the height of the part is too large, the technical end of the part is reduced as much as possible, the phenomenon that the plates are stacked in the forming process to generate wrinkles is prevented, the technical end ranges from 6mm to 20mm, and the expanded view is shown in figure 2.
As shown in fig. 3 to 8, the forming area of the male die is lower than the blank holder on the outer side, and the fillet of the male die and the female die is considered here, the purpose of the fillet is to prevent the part from being scratched when forming, and the height of the fillet is to be eliminated when the blank holder is higher than the height of the forming area; the gap between the outer profile of the female die and the inner profile of the blank holder is obtained by the thickness of the plate, the friction force applied to the plate and the tensile strength of the plate, so that the plate is always in a tightened state along the tangential direction, and the forming and manufacturing of parts are completed.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (3)
1. A one-time hot-press forming die for a titanium alloy skin with large curvature and variable cross section is characterized in that the die only consists of a male die and a female die and is not provided with a blank holder in a middle layer; the outer side of the male die is provided with a blank holder, the inner part of the male die is provided with a profile area, and the height of the profile area is lower than that of the blank holder at the outer side; the molded surface of the inner side of the blank holder is the same as the molded surface of the part; the female die is wrapped inside the male die blank holder after die assembly; the forming method of the hot press forming of the die is characterized in that a gap is formed between the outer side of the female die and the inner side of the blank holder, the plate is clamped in advance through the die assembly of the female die and the male die, the plate is always in a clamping state in the process of continuing die assembly, the blank holder effect is further achieved, the blanking size is accurately calculated through a part to be formed, the process end of the part is reduced, the phenomenon that the plate is stacked due to the fact that the process end is too large is avoided, and wrinkles generated in the part forming process are prevented.
2. The primary hot press forming die for the large-curvature and variable-section titanium alloy skin according to claim 1, wherein the forming method comprises the following specific steps:
the method comprises the following steps: calculating the size of the titanium alloy spreading material to be calculated by adopting an approximate calculus grid drawing method according to the external dimension of the part to be formed, and obtaining the titanium alloy spreading material with the size required by the part to be formed;
step two: determining a process end of the part to be molded according to the height of the part to be molded, and processing the process end to form a saw-tooth shape;
step three: placing the titanium alloy spread material obtained in the step one on a part forming male die, and closing an upper die and a lower die of the die;
step four: carrying out hot pressing treatment on the titanium alloy expanded material, and enabling the titanium alloy expanded material to be in a compressed state all the time in the hot pressing process;
step five: and forming the titanium alloy skin with large curvature and variable cross section.
3. The large-curvature and variable-section titanium alloy skin one-time hot press forming die according to claim 2, wherein the process end is 10 mm; if the height of the part to be molded is lower than 60mm, enlarging the process end to 20 mm; if the height of the part to be molded is higher than 200 mm; the process end is shortened to 6 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711466097.5A CN109967619B (en) | 2017-12-28 | 2017-12-28 | One-step hot-press forming die for large-curvature and variable-section titanium alloy skin |
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| CN201711466097.5A CN109967619B (en) | 2017-12-28 | 2017-12-28 | One-step hot-press forming die for large-curvature and variable-section titanium alloy skin |
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| CN112792200A (en) * | 2020-12-28 | 2021-05-14 | 航天海鹰(哈尔滨)钛业有限公司 | Hot-press forming method for variable-curvature skin sheet metal part |
| CN113857356A (en) * | 2021-11-09 | 2021-12-31 | 西安航空学院 | Forming die and method for airplane skin parts |
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| BR112012024685A2 (en) * | 2010-04-12 | 2016-06-07 | Crown Packaging Technology Inc | method of making a metal cup, apparatus for making a meta cup, container body and container |
| JP5644942B2 (en) * | 2011-05-16 | 2014-12-24 | トヨタ自動車株式会社 | Hot press mold and method for manufacturing hot press mold |
| CN103042090B (en) * | 2013-01-06 | 2015-10-28 | 重庆水轮机厂有限责任公司 | Turbine runner blade compression-moulding methods |
| CN107263016A (en) * | 2016-04-06 | 2017-10-20 | 哈尔滨飞机工业集团有限责任公司 | A kind of big plate width complex profile structural skin processing method |
| CN206199991U (en) * | 2016-08-12 | 2017-05-31 | 福州汇龙机械模具有限责任公司 | A kind of hard mould of high-strength plate |
| CN107855395A (en) * | 2017-12-07 | 2018-03-30 | 北京星航机电装备有限公司 | A kind of titanium alloy box-shaped part Hot drawing device |
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