CN113084064B - Large titanium alloy deep cavity long box rib forging, die and forming method thereof - Google Patents
Large titanium alloy deep cavity long box rib forging, die and forming method thereof Download PDFInfo
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- CN113084064B CN113084064B CN202110401443.1A CN202110401443A CN113084064B CN 113084064 B CN113084064 B CN 113084064B CN 202110401443 A CN202110401443 A CN 202110401443A CN 113084064 B CN113084064 B CN 113084064B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
- B21J5/025—Closed die forging
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J13/00—Details of machines for forging, pressing, or hammering
- B21J13/02—Dies or mountings therefor
Abstract
The invention discloses a large titanium alloy deep cavity long box rib forging, a die and a forming method thereof, wherein the die comprises an upper die with a spaced boss and a lower die with a plurality of grooves, the boss is arranged at the center of the width of the bottom surface of the upper die, the bosses are arranged in the length direction, and the grooves on the lower die are arranged in plurality; when the upper die and the lower die are closed, the inner shape of the combined upper die cavity and lower die cavity corresponds to the outer shape of the large titanium alloy deep cavity long box rib forging. The invention has ingenious conception, improves the forging die by adjusting the design of the forging, has convenient and quick forming of the designed forging with the draft and convenient taking of the forging, and has small allowance of the produced forging by machining operation before forging, the outline of the forging is completely distributed along the outline of the part, the integrity of the metal streamline of the forging is kept, and the tissue mechanical property of the forging is improved to a great extent.
Description
Technical Field
The invention relates to the field of manufacturing of titanium alloy deep cavity long box rib dies, in particular to a large titanium alloy deep cavity long box rib forging, a die and a forming method thereof.
Background
In the prior art, the forging of large titanium alloy deep cavity long box rib forgings is usually produced by a die forging mode or a traditional die forging mode. However, the forged piece produced by adopting the forming die mode has low material utilization rate and poor heat treatment hardenability, the metal flow line is basically cut off when the part is machined, and the structure mechanical property and uniformity cannot be ensured. As shown in fig. 5, the design of the traditional die forging forge piece is mainly that a die is partially arranged in the connecting rib of a deep cavity rib, and the produced forge piece has the problem of low material utilization rate because the die parting surface is provided with a thicker connecting skin, and because the inner side wall and the outer side wall of the deep cavity of the forge piece are provided with larger die drawing slopes and the forge piece allowance is large; in addition, the metal streamline can also be cut off in the process of machining parts, the processing technology is more tedious, the production efficiency is not high, and when the inner side wall and the outer side wall of the deep cavity of the forging have larger draft, the filling capacity of metal in the cavity of the forging die is poor, so that great examination is brought to the tonnage of forging equipment.
Disclosure of Invention
The invention aims to provide a large titanium alloy deep cavity long box rib die and a forging forming method thereof, and solves the problems of low material utilization rate, cut-off of a metal flow line, poor forging forming and non-uniform comprehensive mechanical property in the forging process of a deep cavity long box rib forge piece in the prior art.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention discloses a large titanium alloy deep cavity long box rib forging which comprises a forging body, wherein a plurality of top surface groove bodies are arranged on the top surface of the forging body, a connecting rib is arranged between every two adjacent top surface groove bodies, two rectangular bosses are arranged on the bottom surface of the forging body, a plurality of side edge trapezoidal tables are symmetrically arranged on the side walls of the forging body in the two length directions, and the side edge trapezoidal tables are positioned at the tops of the side walls.
Furthermore, four sides of the top surface groove body and the side walls in the two length directions are provided with draft angles.
A die for forging the large titanium alloy deep cavity long box rib forge piece comprises an upper die with spaced bosses and a lower die with grooves, wherein the bosses are arranged at the center of the width of the bottom surface of the upper die, a plurality of bosses are arranged in the length direction and correspond to the shape of the top surface of the large titanium alloy deep cavity long box rib forge piece, and a plurality of grooves are arranged on the lower die and correspond to the shape of the bottom surface of the large titanium alloy deep cavity long box rib forge piece; and after the upper die and the lower die are closed, the inner shape of the combined upper die cavity and lower die cavity corresponds to the outer shape of the large titanium alloy deep cavity long box rib forging.
Further, the side wall of the cavity of the lower die is provided with a draft angle, the side wall of the boss is provided with a draft angle, wherein the draft angle a2 of the side wall of the lower die cavity is set to be 3-5 degrees, and the draft angle a1 of the side wall of the upper die cavity is 1-3 degrees.
Furthermore, a plurality of lower ejector rods are arranged on the lower die and distributed at the positions, which are planar, of the bottoms of the large titanium alloy deep cavity long box rib forgings.
Further, after the upper die and the lower die are closed, the bottom surface of the upper die is in contact with the top surface of the lower die to form a die parting surface, and the die parting surface is located at the top end of a connecting rib of the large titanium alloy deep cavity long box rib forge piece.
The forging forming method by using the large titanium alloy deep cavity long box rib die is characterized in that: the method specifically comprises the following steps of,
step one, preparation of a rough blank, namely freely forging a bar into the rough blank;
step two, machining the rough blank, namely machining the upper surface and the lower surface of the rough blank along the height direction, wherein the surface roughness of the rough blank is Ra1.6-3.2 mu m during machining;
thirdly, flaw detection of the processed rough blanks, namely performing ultrasonic flaw detection on the processed rough blanks to detect the consistency of internal tissues of the rough blanks;
step four, forging and forming by stages:
1) performing, namely placing the blank subjected to ultrasonic flaw detection in a large titanium alloy deep cavity long box rib die for conventional positioning forging to perform the blank in a die cavity;
2) final forming, namely placing the preformed blank in a die cavity for quasi-beta forging or beta forging to finally form the blank in the die cavity to obtain a forged piece meeting the requirements of the drawing;
3) and ejecting the forged piece out of the forging die through a lower ejection rod in the operation of the forging machine tool, and taking away the forged piece through manual operation or a mechanical arm and placing the forged piece on a product storage rack.
Further, the heating temperature of the blank is 30-50 ℃ below the transformation point during preforming, and the heat preservation time is 0.4-0.8 minutes multiplied by the effective section thickness; the heating temperature of the blank is 10-30 ℃ above the transformation point during final forming, and the heat preservation time is 0.2-0.5 minutes multiplied by the effective section thickness.
Compared with the prior art, the invention has the beneficial technical effects that:
the invention relates to a large titanium alloy deep cavity long box rib forge piece, a die and a forming method thereof, wherein the die comprises an upper die and a lower die, a plurality of bosses are arranged on the upper die, a plurality of grooves are arranged on the top surface of the lower die, and after the upper die and the lower die are closed, the inner shape of the combined upper die cavity and lower die cavity corresponds to the outer shape of the large titanium alloy deep cavity long box rib forge piece; the forging method for the large titanium alloy deep cavity long box rib forge piece by using the die comprises the four steps of 1) forging a bar into a rough blank, 2) machining the rough blank, 3) detecting flaws of the machined rough blank, 4) forging and forming in stages, and the forging and forming operation of the forge piece is completed. The invention has ingenious conception, improves the forging die by adjusting the design of the forging, the parting surface is arranged at one side of the top surface of the forging, and the drawing inclination is arranged on the side wall of the cavity of the lower die and the side wall of the lug boss, so that the forging is convenient and quick to form and convenient to take. Meanwhile, the forging forming method of the forging die can quickly produce the large-scale titanium alloy deep cavity long box rib forge piece on forging equipment with limited tonnage by adopting conventional forging (alpha + beta two-phase region), quasi-beta forging or beta forging technology.
Drawings
The invention is further illustrated in the following description with reference to the drawings.
FIG. 1 is a schematic structural diagram of a large titanium alloy deep cavity long box rib forging of the invention;
FIG. 2 is a schematic longitudinal section structure view of a large titanium alloy deep cavity long box rib mold of the invention;
FIG. 3 is a schematic cross-sectional structure view of a large titanium alloy deep cavity long box rib mold of the invention;
FIG. 4 is a microstructure diagram of a forged piece processed by the forging die of the large titanium alloy deep cavity long box rib die;
FIG. 5 is a schematic structural view of a titanium alloy deep cavity long box rib forging in the prior art;
description of reference numerals: 1. an upper die; 2. a boss; 3. an upper die cavity; 4. a lower die; 5. a lower mold cavity; 6. A lower ejector rod; 7. parting surfaces; 8. a forging body; 801. a top surface trough body; 802. connecting ribs; 803. a rectangular boss; 804. a side trapezoidal table;
a1, drawing draft angle of the side wall of the upper die cavity; a2, drawing draft angle of the side wall of the lower mold cavity; r1, a convex fillet at the bottom of the upper die boss; r2, concave round corner at the bottom of the lower die cavity.
Detailed Description
As shown in fig. 1, the large titanium alloy deep cavity long box rib forging comprises a forging body 8, wherein a plurality of top surface groove bodies 801 are arranged on the top surface of the forging body 8, a connecting rib 802 is arranged between every two adjacent top surface groove bodies 801, two rectangular bosses 803 are arranged on the bottom surface of the forging body 8, a plurality of side trapezoid platforms 804 are symmetrically arranged on the side walls of the forging body in two length directions, and the side trapezoid platforms 804 are located at the tops of the side walls. Specifically, in order to make the molding manufacturability better, the four side edges and the two side walls in the length direction of the top groove 801 are provided with draft angles. Through the adjustment to the trapezoidal platform 804 position in side, change the position of die joint for the shaping manufacturability of product is more, and the mould structure becomes simpler.
As shown in fig. 2-3, the die for forging the large titanium alloy deep cavity long box rib forging comprises an upper die 1 with spaced bosses 2 and a lower die 4 with grooves, wherein the bosses 2 are arranged at the center of the width of the bottom surface of the upper die 1, a plurality of bosses 2 are arranged in the length direction and correspond to the shape of the top surface of the large titanium alloy deep cavity long box rib forging, and a plurality of grooves on the lower die 4 are arranged and correspond to the shape of the bottom surface of the large titanium alloy deep cavity long box rib forging; and when the upper die 1 and the lower die 4 are closed, the inner shape of the combined upper die cavity 3 and lower die cavity 5 corresponds to the outer shape of the large titanium alloy deep cavity long box rib forging. Specifically, the shape and specification of the plurality of bosses 2 correspond to the top surface grooves 801 one by one, and the shape and specification of the groove on the lower die 4 correspond to the shape of the forging body 8 and the specification of the rectangular boss 803.
Specifically, the side wall of the cavity of the lower die 4 is provided with a draft angle, the side wall of the boss 2 is provided with a draft angle, wherein the draft angle a2 of the side wall of the lower die cavity 5 is set to be 3-5 degrees, the draft angle a1 of the side wall of the upper die cavity 3 is 1-3 degrees, and the draft angle of the cavity is the same as the draft angle of the relative forming position on the forging.
Specifically, a plurality of lower ejector rods 6 are arranged on the lower die 4, and the lower ejector rods 6 are distributed at the positions, which are planar, at the bottom of the large titanium alloy deep cavity long box rib forging. In addition, the distribution of the ejection rods needs to be kept balanced, so that the stress balance during ejection of the forge piece is ensured, and the problem of local ejection deformation is avoided.
Specifically, after the upper die 1 and the lower die 4 are closed, the bottom surface of the upper die 1 is in contact with the top surface of the lower die 4 to form a die parting surface 7, the die parting surface 7 is located at the top end of a connecting rib of a large titanium alloy deep cavity long box rib forging, the side trapezoidal table 804 is formed on the lower die 4, and a common parting surface is located at the maximum outline of the forging according to the die design principle.
The forging and forming method by utilizing the large titanium alloy deep cavity long box rib die specifically comprises the following steps,
step one, preparation of a rough blank, namely freely forging a bar stock to prepare the rough blank;
step two, machining the rough blank, namely machining the upper surface and the lower surface of the rough blank along the height direction, wherein the surface roughness is required to be Ra1.6-3.2 mu m during machining, and the thickness of the blank reserved after machining is 150 mm; through the mechanical processing, the rough blank with a planar structure is subjected to primary machining forming by a plurality of top surface groove bodies 801 on the upper surface and rectangular bosses 803 on the lower surface according to the design of the forge piece, and the consistency of the forging thickness of each area is kept during forging, so that the quality of the forge piece is better ensured;
thirdly, flaw detection of the processed rough blank, namely performing ultrasonic flaw detection on the processed rough blank to detect the consistency of internal tissues of the rough blank; through nondestructive testing in the middle process, the defect-free interior of the blank is ensured; ensuring that the high power structure of the final forging meets the standard requirement, as shown in figure 4.
Step four, forging and forming by stages:
1) performing, namely placing the blank subjected to ultrasonic flaw detection in a large titanium alloy deep cavity long box rib die for conventional positioning forging to perform the blank in a die cavity; the heating temperature of the preformed blank is 30-50 ℃ below the phase transition point, and the heat preservation time is 0.4-0.8 minutes multiplied by the effective section thickness.
2) Final forming, namely placing the preformed blank in a die cavity for quasi-beta forging or beta forging to finally form the blank in the die cavity to obtain a forged piece meeting the requirements of the drawing; specifically, the heating temperature of the blank during final forming is 10-30 ℃ above the phase transition point, and the heat preservation time is 0.2-0.5 minutes multiplied by the effective section thickness.
3) And ejecting the forged piece out of the forging die through a lower ejection rod in the operation of the forging machine tool, and taking away the forged piece through manual operation or a mechanical arm and placing the forged piece on a product storage rack.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (5)
1. The utility model provides a forge mould of long box rib forging of large-scale titanium alloy deep cavity, the long box rib forging of large-scale titanium alloy deep cavity includes the forging body, be provided with a plurality of top surface cell bodies on the top surface of forging body, be provided with the splice bar between two adjacent top surface cell bodies, four sides of top surface cell body and two length direction's lateral wall are provided with the pattern drawing inclination, be provided with two rectangle bosss on the bottom surface of forging body, the symmetry is provided with the trapezoidal platform of a plurality of sides on two length direction's of forging body the lateral wall, just the trapezoidal platform of side is located the top of lateral wall, its characterized in that: the die comprises an upper die with a spaced boss and a lower die with a groove, wherein the boss is arranged at the center of the width of the bottom surface of the upper die, a plurality of bosses are arranged in the length direction and correspond to the shape of the top surface of a large titanium alloy deep cavity long box rib forging, and a plurality of grooves are arranged on the lower die and correspond to the shape of the bottom surface of the large titanium alloy deep cavity long box rib forging; after the upper die and the lower die are closed, the inner shape of the combined upper die cavity and lower die cavity corresponds to the outer shape of the large titanium alloy deep cavity long box rib forging; after the upper die and the lower die are closed, the bottom surface of the upper die is in contact with the top surface of the lower die to form a die parting surface, and the die parting surface is located at the top end of a connecting rib of the large titanium alloy deep cavity long box rib forge piece.
2. The die for forging the large-scale titanium alloy deep-cavity long box rib forging piece according to claim 1, wherein: the side wall of the cavity of the lower die is provided with a draft angle, the side wall of the boss is provided with a draft angle, wherein the draft angle a2 of the side wall of the lower die cavity is set to be 3-5 degrees, and the draft angle a1 of the side wall of the upper die cavity is 1-3 degrees.
3. The die for forging the large-scale titanium alloy deep-cavity long box rib forging piece according to claim 1, wherein: and the lower die is provided with a plurality of lower ejector rods, and the lower ejector rods are distributed at the positions, which are planar, of the bottom of the large titanium alloy deep cavity long box rib forging.
4. The die forging forming method for forging the large titanium alloy deep cavity long box rib forging piece is characterized by comprising the following steps of: the method specifically comprises the following steps of,
step one, preparation of a rough blank, namely freely forging a bar stock into the rough blank;
step two, machining the rough blank, namely machining the upper surface and the lower surface of the rough blank along the height direction, wherein the surface roughness of the rough blank is Ra1.6-3.2 mu m during machining;
thirdly, flaw detection of the processed rough blank, namely performing ultrasonic flaw detection on the processed rough blank to detect the consistency of internal tissues of the rough blank;
step four, forging and forming by stages:
1) performing, namely placing the blank subjected to ultrasonic flaw detection in a die for forging the large-scale titanium alloy deep-cavity long box rib forge piece for conventional positioning forging to perform the blank in a die cavity;
2) final forming, namely placing the preformed blank in a die cavity for quasi-beta forging or beta forging to finally form the blank in the die cavity to obtain a large titanium alloy deep-cavity long box rib forging meeting the requirements of a drawing;
3) and (3) ejecting the large titanium alloy deep cavity long box rib forge piece out of the die through a lower ejection rod in the operation of the forging machine tool, and taking away the large titanium alloy deep cavity long box rib forge piece through manual operation or a mechanical arm to place the large titanium alloy deep cavity long box rib forge piece on a cooling frame.
5. The die forging forming method for forging the large-scale titanium alloy deep-cavity long box rib forging according to claim 4, wherein the method comprises the following steps: during preforming, the heating temperature of the blank is 30-50 ℃ below the transformation point, and the heat preservation time is 0.4-0.8 minutes multiplied by the effective section thickness; the heating temperature of the blank is 10-30 ℃ above the transformation point during final forming, and the heat preservation time is 0.2-0.5 minutes multiplied by the effective section thickness.
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| CN113634701B (en) * | 2021-08-19 | 2023-08-15 | 北京北方车辆集团有限公司 | Forging and demolding method of electric screw press without upper ejection |
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| JP2005014079A (en) * | 2003-06-30 | 2005-01-20 | Aichi Steel Works Ltd | Manufacturing method for partial-cold-working strengthened connecting-rod |
| CN103192014A (en) * | 2013-03-21 | 2013-07-10 | 无锡透平叶片有限公司 | Structure of titanium alloy large-scale rib die forging |
| CN104439001B (en) * | 2014-11-29 | 2017-09-01 | 无锡透平叶片有限公司 | A kind of die-forging forming method of large titanium alloy structural member |
| CN106975722B (en) * | 2017-05-12 | 2018-11-30 | 吴浩 | The flexible release method of the large scale special-shaped structural forging of closed die forging |
| CN110976747B (en) * | 2019-12-24 | 2021-10-15 | 陕西宏远航空锻造有限责任公司 | Method for forging TC17 alloy blisk through beta forging |
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