CN115815498A - Method for forming long-rod titanium alloy extrusion part with three-branch branches at two ends - Google Patents
Method for forming long-rod titanium alloy extrusion part with three-branch branches at two ends Download PDFInfo
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- CN115815498A CN115815498A CN202211607751.0A CN202211607751A CN115815498A CN 115815498 A CN115815498 A CN 115815498A CN 202211607751 A CN202211607751 A CN 202211607751A CN 115815498 A CN115815498 A CN 115815498A
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Abstract
The invention relates to the technical field of plastic processing and forming of metal materials, in particular to a forming method of a long-rod titanium alloy extrusion with three-branch branches at two ends. The method comprises the following steps: blanking the bar; drawing out the middle part of the bar to form an initial rod part, and keeping two end heads unchanged; extruding and forging two end heads by using a tool, so that the cross section of the end head is changed into an irregular axisymmetric hexagon, wherein the irregular axisymmetric hexagon is an equilateral triangle without vertex angles and base angles; the central axis of the new end is coaxial with the central axis of the initial state rod part; drawing out the rod part in the initial state to obtain a rough blank, wherein the diameter of the rod part of the rough blank is the same as that of the rod part of the forge piece; and performing die forging on the blank, wherein the metal at the end of the blank flows into the special-shaped cavity for forming the end of the forging, and the metal at the rod part of the blank flows into the cavity for forming the rod part of the forging.
Description
Technical Field
The invention relates to the technical field of plastic processing and forming of metal materials, in particular to a forming method of a long-rod titanium alloy extrusion with three-branch branches at two ends.
Background
The highest speed per hour of the navigation of the modern spacecraft reaches more than 2.7 times of the speed of sound. Such fast supersonic flight can cause the spacecraft to rub against the air and generate a significant amount of heat. In this case, a material resistant to high temperature must be used. The "space metal" titanium is the first to come, has light weight, high strength, good corrosion resistance and high temperature resistance, and is especially suitable for manufacturing various spacecrafts. The titanium alloy is mainly used for manufacturing airplanes and engines in aviation, and can meet the use performance of the titanium alloy. When the extrusion piece is formed in a free forging mode, the problem that two ends and the rod part are not coaxial is easily caused, the forming shapes of the two ends of the rod part are not regular, the processing requirements of forgings are difficult to meet, the operation is difficult, and the material utilization rate is low.
Disclosure of Invention
The invention aims to provide a method for molding a long-rod titanium alloy extrusion part with three-branch branches at two ends, aiming at overcoming the defects and shortcomings of the prior art, and the method improves the yield of titanium alloy forging parts and the utilization rate of materials by reasonably designing the preforming structure of the extrusion part, has simple molding process, greatly improves the production efficiency and improves the performance of the extrusion part.
The technical scheme is as follows:
a forming method of a long-rod titanium alloy extrusion part with three-branch branches at two ends comprises the following steps:
blanking the bar;
drawing out the middle part of the bar to form an initial rod part, and keeping two end heads unchanged;
extruding and forging two end heads by using a preformed part tool to change the cross section of the end head into an irregular axisymmetric hexagon which is an equilateral triangle without vertex angles and bottom angles; the central axis of the new end is coaxial with the central axis of the rod part in the initial state;
drawing out the rod part in the initial state to obtain a rough blank, wherein the diameter of the rod part of the rough blank is the same as that of the rod part of the forge piece;
and performing die forging on the blank, wherein the metal at the end of the blank flows into the special-shaped cavity for forming the end of the forging, and the metal at the rod part of the blank flows into the cavity for forming the rod part of the forging.
Before the intermediate portion of the bar is drawn out to form the initial stem of the pierced billet, the method further comprises:
the material distributing groove is machined at two ends of the bar material, so that when the forged piece is preformed, the irregular axisymmetric hexagonal bodies at two ends of the forged piece have enough forged piece volume.
Utilize preforming piece frock to carry out extrusion forging to preforming piece both ends, include:
preheating a tool for special forming pre-forming new end heads to be more than or equal to 350 ℃, preserving heat for more than or equal to 2 hours, forming one angle end of one end of a rod part every 120 degrees by utilizing the axial symmetry characteristic of hexagons at two ends of the rod part of the pre-forming piece during forging, and obtaining three angle ends of one end of the pre-forming piece; the preform is shaped into another new end using the same method.
The preformed part tool is a standard block with an inverted trapezoidal groove, the end head is clamped in the inverted trapezoidal groove, and the included angle between the groove bottom and the groove wall is 120 degrees.
The process from the bar stock to the rough blank can be completed by only 1 fire.
The die forging is completed by 1 fire.
The heating specification from bar stock to forging is: heating to 40 ℃ below the phase transformation point and calculating the heat preservation time according to the heating specification coefficient of 0.8 min/mm.
The invention has the beneficial effects that: the forming method of the long-rod titanium alloy extrusion part with the three-forked branch at the two ends adopts a free forging preforming method, and a preforming structure of the extrusion part is formed by utilizing a tool with an irregular axisymmetric hexagon body, so that the preforming structure is ingenious in design, good in reliability and strong in operability; the die forging final forming method is adopted, the overall and constraint of the die are utilized to form the outline of the extruded piece, and the final forming structure is high in precision, strong in reliability and good in formability. The forming process is divided into two stages of free forging preforming and die forging final forming, and the trident branches at two ends of the extrusion piece are formed in stages by changing the direction of the forging piece, so that the forming is complete and accurate, the streamline distribution is uniform, the forming property is good, and no defect exists; the rod part of the forge piece is drawn out twice, so that the forging is simple to operate, convenient to realize, smooth in streamline and free of defects; the flow of metal can be well controlled by the profile of the extrusion part formed in the pre-forming and final forming stages, so that the arc line edges of the irregular axisymmetric hexagonal body with radian, and the part of the irregular axisymmetric hexagonal body with radian connected with the rod piece do not generate mechanical defects such as folding, cracks and the like; through the integral ejection device, the material taking becomes simple, and the integral operation is simplified.
Description of the drawings:
in order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a mold assembly view of the present invention;
FIG. 2 isbase:Sub>A sectional view taken along the line A-A in FIG. 1
FIG. 3 is a tooling diagram of a preformed irregular axisymmetric hexagonal body;
FIG. 4 is a schematic view of a preformed extrusion;
FIG. 5 is a schematic view showing the operation of the die in the final extrusion of the blank;
FIG. 6 is a schematic view of a final-shaped extrusion;
wherein, 1, an upper template; 2. an inner hexagonal fastening bolt; 3. an upper die; 4. a lower die; 5. a special-shaped top block; 6. a lower template; 7. a top rod; 8. performing a tool for the irregular axisymmetric hexagon; 3-1, a cavity of an upper die; 4-1, a cavity of a lower die;
Detailed Description
A method for forming a long-rod titanium alloy extrusion part with three branches at two ends comprises the following steps:
1. blanking the bar;
2. machining material distributing grooves at two ends of the bar;
3. heating the titanium alloy blank to 40 ℃ below the phase transformation point, calculating the heat preservation time according to the heating specification coefficient of 0.8min/mm, drawing out the middle part of the bar to form an initial rod part, and keeping two end heads unchanged;
4. preheating a tool for a new end of a special forming preformed piece (shown in figures 3-4) to be more than or equal to 350 ℃, preserving heat for more than or equal to 2 hours, and forming one angle end of one end of a rod part every 120 degrees by utilizing the axial symmetry characteristic of hexagons at two ends of the rod part of the preformed piece during forging to obtain three angle ends of one end of the preformed piece; the preform is shaped into another new end using the same method.
5. Drawing out the initial state rod part to obtain a blank, wherein the diameter of the rod part of the blank is the same as that of the rod part of the forged piece;
6. heating a titanium alloy rough blank to 40 ℃ below a phase transformation point, calculating heat preservation time according to a heating standard coefficient of 0.8min/mm, and integrally heating a final forming die of an extrusion piece to more than 350 ℃ and preserving heat, wherein the final forming die comprises an upper die assembly connected with a slide block of a press machine, a lower die assembly connected with a lower structure of the press machine and an ejection device; as shown in fig. 1-2 and 5, the upper mold assembly comprises an upper template and an upper mold, the lower mold assembly comprises a lower template and a lower mold, and the ejection device comprises an ejector rod and a special-shaped ejector block;
7. mounting the preheated and heat-preserved die on a press; uniformly spraying an organic graphite lubricant to the inner cavity of the mold; putting the titanium alloy rough blank subjected to heat treatment into a lower die cavity;
8. the slide block of the press machine drives the upper die assembly to move downwards, and after the integral cavity of the die is closed, the pressure is maintained for 2min, so that the titanium alloy preformed piece is formed into an extruded piece in the integral cavity of the die;
9. the press machine sliding block drives the upper die assembly to move upwards; the ejection cylinder of the press moves upwards to enable the integral ejection device to move upwards, so that the hexagonal body with the irregular axisymmetric radian of the extrusion piece is completely separated from the cavity of the lower die and then taken out; the upper and lower die assemblies are closed, the fastening bolts connected to the press ram and lower table are loosened, the die is unloaded, and the final extrusion as shown in fig. 6 is obtained.
Preferably, the irregular axisymmetric hexagon of the rough blank is that the sizes of three sides between each two phases are equal, and the sizes are divided into two types in total; one is a long straight edge and one is a short straight edge;
preferably, the irregular axisymmetric radian hexagonal bodies of the final extruded part are the same in size and shape of three sides at intervals, and are divided into two types in total; one is a straight line edge, and one is an arc line edge; the similar hexagonal surface is provided with a pattern drawing slope; fillets are chamfered at the corners of cavities at two ends of the lower die;
preferably, the axial symmetry characteristics of the forging are significant; the middle rod of the forging is long, needs to be drawn out twice, and is convenient to operate;
preferably, the tooling of the irregular axisymmetric hexagonal body is completely the same as one end of the preformed piece;
preferably, the die parting surface of the forged piece forms an unconventional die parting surface along the maximum sectional area of the forged piece; the parting surfaces form a V shape; a flash groove is arranged between the parting surfaces of the upper die and the lower die;
this embodiment has designed preforming and two stages of final forming, closed die structure and holistic ejecting device: the pre-forming structure of the forge piece is formed by utilizing the tool of the irregular axisymmetric hexagonal body and a free forging mode, so that the forming mode is simple, easy to operate, economical and applicable; by utilizing the axial symmetry characteristic of the hexagonal bodies at the two ends of the forging, when in forging, after one angle end is formed each time, the three angle ends of the hexagonal body at one end of the forging are rotated by 120 degrees, and the irregular axisymmetric hexagonal body at the other end of the preformed piece is formed by utilizing the same method, so that the operation is simplified, the formability is good, and no defect exists; the rod part of the extrusion part is drawn and formed twice by utilizing the characteristics of the maximum inscribed circle of the irregular axisymmetric hexagon of the pre-forming part and the characteristics of the maximum inscribed circle of the hexagonal body of the extrusion part with the final forming irregular axisymmetric radian, so that the flow of metal is well controlled, the streamline distribution is uniform, and the probability of warping of the rod part of the forging part is reduced when the pre-forming forging part is formed; through the final forming stage, the die drawing inclination and the fillet of the upper die and the lower die cavity and the V-shaped die parting surface formed by die assembly of the upper die and the lower die are reasonably designed, so that the final forming extrusion piece is easy to fill the die cavity, the flow of metal is reasonably distributed, perfect streamline is generated, the defects of warping and the like are avoided, and the extrusion piece is easy to form and easy to take. After the blank is deformed integrally, the size parameters of an extruded part of the blank reach reasonable values, the crystal grains are obviously refined mechanically, and the comprehensive performance is obviously improved.
Claims (8)
1. The utility model provides a forming method of two ends trident branch long pole class titanium alloy extruded piece which characterized in that includes:
blanking the bar;
drawing out the middle part of the bar to form an initial rod part, and keeping two end heads unchanged;
extruding and forging two end heads by using a preformed part tool to change the cross section of the end head into an irregular axisymmetric hexagon which is an equilateral triangle without vertex angles and bottom angles; the central axis of the new end is coaxial with the central axis of the rod part in the initial state;
drawing out the rod part in the initial state to obtain a rough blank, wherein the diameter of the rod part of the rough blank is the same as that of the rod part of the forge piece;
and (3) die forging the blank, wherein the metal at the end of the blank flows into the special-shaped cavity for forming the end of the forged piece, and the metal at the rod part of the blank flows into the cavity for forming the rod part of the forged piece.
2. The method of claim 1, wherein drawing the middle portion of the rod before forming the initial stem of the pierced block further comprises:
the material distributing groove is machined at two ends of the bar material, so that when the forged piece is preformed, the irregular axisymmetric hexagonal bodies at two ends of the forged piece have enough forged piece volume.
3. The method of claim 2, wherein extrusion forging the two ends using a preform tooling comprises:
preheating a tool for special molding of a new end of a preformed piece to be more than or equal to 350 ℃, preserving heat for more than or equal to 2 hours, and molding one angle end of one end of a rod part by rotating 120 degrees each time when forging by utilizing the axisymmetric characteristic of hexagons at two ends of the rod part of the preformed piece to obtain three angle ends of one end of the preformed piece; the preform is shaped into another new end using the same method.
4. The method of claim 1 wherein the preform tooling is a standard block having an inverted trapezoidal shaped groove with the ends captured within the inverted trapezoidal shaped groove and the groove bottom angled at 120 ° to the groove wall.
5. The method of claim 1, wherein the process from the bar stock to the blank is performed only 1 fire.
6. The method of claim 1, wherein the swaging is performed 1 fire.
7. The method of claim 1, wherein the heating specification from bar stock to forging is: heating to 40 ℃ below the phase transformation point and calculating the heat preservation time according to the heating specification coefficient of 0.8 min/mm.
8. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the method according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211607751.0A CN115815498A (en) | 2022-12-14 | 2022-12-14 | Method for forming long-rod titanium alloy extrusion part with three-branch branches at two ends |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211607751.0A CN115815498A (en) | 2022-12-14 | 2022-12-14 | Method for forming long-rod titanium alloy extrusion part with three-branch branches at two ends |
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| CN115815498A true CN115815498A (en) | 2023-03-21 |
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| CN202211607751.0A Pending CN115815498A (en) | 2022-12-14 | 2022-12-14 | Method for forming long-rod titanium alloy extrusion part with three-branch branches at two ends |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117000940A (en) * | 2023-09-04 | 2023-11-07 | 常州市丰乐精锻有限公司 | Forging die, equipment and method for crude material of fuel pipe |
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- 2022-12-14 CN CN202211607751.0A patent/CN115815498A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117000940A (en) * | 2023-09-04 | 2023-11-07 | 常州市丰乐精锻有限公司 | Forging die, equipment and method for crude material of fuel pipe |
| CN117000940B (en) * | 2023-09-04 | 2023-12-19 | 常州市丰乐精锻有限公司 | Forging die, equipment and method for crude material of fuel pipe |
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