CN111872169A - Processing die and processing method for high-strength titanium alloy tube blank - Google Patents
Processing die and processing method for high-strength titanium alloy tube blank Download PDFInfo
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- CN111872169A CN111872169A CN202010667809.5A CN202010667809A CN111872169A CN 111872169 A CN111872169 A CN 111872169A CN 202010667809 A CN202010667809 A CN 202010667809A CN 111872169 A CN111872169 A CN 111872169A
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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
- B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
- B21D5/02—Bending sheet metal along straight lines, e.g. to form simple curves on press brakes without making use of clamping means
- B21D5/0209—Tools therefor
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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
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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
- B21D37/18—Lubricating, e.g. lubricating tool and workpiece simultaneously
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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
- B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
- B21D5/02—Bending sheet metal along straight lines, e.g. to form simple curves on press brakes without making use of clamping means
Abstract
The invention provides a processing die and a processing method of a high-strength titanium alloy tube blank, and relates to the technical field of mechanical manufacturing, wherein the processing die of the high-strength titanium alloy tube blank comprises a first die piece, a second die piece and a third die piece connected with the first die piece, the first die piece is arranged at the upper part of the second die piece, the third die piece is connected with the first die piece through a first limiting piece, and the third die piece is connected with the first limiting piece in a sliding manner and is suitable for the third die piece to move towards or away from the second die piece; the second die piece comprises a fixed die cavity which is arranged along the end face, close to the first die piece, of the second die piece in an extending mode in the direction far away from the first die piece, the shape of the fixed die cavity is matched with the outline shape of the third die piece, the second die piece is used for placing a high-strength titanium alloy plate to be processed, and the high-strength titanium alloy plate is suitable for covering the fixed die cavity. The invention has the advantages of simple and convenient process, high efficiency, low cost, strong controllability, high forming precision, excellent performance and wide application prospect.
Description
Technical Field
The invention relates to the technical field of machine manufacturing, in particular to a processing die for a high-strength titanium alloy tube blank and application thereof.
Background
The titanium alloy pipe fitting has wide application in aerospace engine hydraulic pipelines, however, the titanium alloy pipe fitting at present mostly adopts pure titanium or low-strength titanium alloy pipe fittings, along with the continuous improvement of the requirement on the maneuvering performance of an aircraft, the pressure of the hydraulic pipeline is also continuously increased, and the pure titanium and low-strength titanium alloy pipe fittings can not meet the use requirement. However, when the high-strength titanium alloy deforms at room temperature, the deformation resistance is large, the resilience is severe, the forming performance of the material is particularly poor, the pipe is difficult to prepare by adopting the traditional pipe manufacturing process (such as extrusion, rolling and the like), and particularly the pipe with a small diameter-thickness ratio is obtained.
At present, the common processes for preparing the high-strength titanium alloy pipe comprise the following steps: firstly, room temperature multi-pass rolling is combined with inter-pass annealing, however, the process has multiple working procedures and low efficiency, and simultaneously, the multi-pass annealing can reduce the performance of the pipe; secondly, warm rolling process, however, the warm rolling equipment is complex, and the process control stability is poor; thirdly, performing coil welding, namely rolling the tube blank by a plate rolling machine and then welding, however, the method is only suitable for preparing the tube with large diameter-thickness ratio at present, and when the diameter-thickness ratio is small, the high-strength titanium alloy can be broken due to poor plasticity; fourthly, hot-pressing blocking forming is adopted, and then welding is carried out, and the reliability of the tube blank is poor due to more welding seams.
Disclosure of Invention
The invention solves the problems that when the high-strength titanium alloy deforms at room temperature, the deformation resistance is large, the resilience is serious, the forming performance of the material is particularly poor, and the high-strength titanium alloy is difficult to prepare by adopting the traditional pipe making process.
In order to solve the problems, the invention provides a processing die for a high-strength titanium alloy tube blank, which comprises a first die piece, a second die piece and a third die piece connected with the first die piece, wherein the first die piece is arranged at the upper part of the second die piece,
the third module is connected with the first module through a first limiting piece, the third module is connected with the first limiting piece in a sliding mode, the third module is suitable for moving towards the direction close to or away from the second module, and the shape of the end face, close to the third module, of the first module is matched with the contour shape of the third module;
the second die piece comprises a fixed cavity which is arranged along the end face, close to the first die piece, of the second die piece in an extending mode in the direction far away from the first die piece, the shape of the fixed cavity is matched with the outline shape of the third die piece, the second die piece is used for placing a high-strength titanium alloy plate to be machined, and the high-strength titanium alloy plate is suitable for covering the fixed cavity.
Preferably, a sliding groove is formed in the first limiting member, connecting ends are formed at two ends of the third module, the connecting ends are suitable for being inserted into the sliding groove, and the height of the sliding groove is greater than that of the connecting ends.
Preferably, the first limiting member is provided with a connecting hole connected with the first module.
Preferably, the processing mold for the high-strength titanium alloy tube blank further comprises second limiting parts, and the two second limiting parts are connected to the front end and the rear end of the first limiting part respectively.
Preferably, the second die part comprises limiting bosses which are arranged on the end face, close to the first die part, of the second die part, the two limiting bosses are located on two sides of the fixed cavity, and the high-strength titanium alloy plate is suitable to be placed between the two limiting bosses.
Preferably, a temperature measuring hole is formed in the second module and used for placing a temperature measuring instrument.
Preferably, the processing mold for the high-strength titanium alloy pipe blank further comprises a heating device, and the heating device is arranged outside the second mold component.
Preferably, the processing mold for the high-strength titanium alloy tube blank further comprises an insulation box, and the second mold and the third mold are arranged inside the insulation box.
Preferably, the third module is a cylindrical structure, and the radius of the third module gradually increases or decreases along the length direction of the third module.
Compared with the prior art, the processing die for the high-strength titanium alloy tube blank has the advantages of simple structure, easiness in operation, no need of multi-pass long-time annealing, high efficiency, low cost, strong controllability, high forming precision, excellent performance and the like, and has wide application prospect.
In order to solve the technical problems, the invention provides a method for processing a high-strength titanium alloy tube blank, which is based on a processing die of the high-strength titanium alloy tube blank and comprises the following steps:
step S1, after a second module is heated to the forming temperature of the high-strength titanium alloy plate, the high-strength titanium alloy plate is placed between two limiting bosses of the second module, the first module moves towards the direction close to the second module under the action of external force, after the third module is contacted with the high-strength titanium alloy plate, the third module slides into the top of the sliding groove and is contacted with the first module, and at the moment, the high-strength titanium alloy plate enters a fixed cavity of the second module under the action of the pressure of the first module to obtain a high-strength titanium alloy U-shaped part and perform primary heat preservation;
step S2, moving the first mold part away from the second mold part under the action of an external force, allowing the third mold part to enter the bottom of the chute under the action of gravity, forming a gap between the third mold part and the first mold part, rotating the high-strength titanium alloy U-shaped part 90 ° clockwise, allowing one end of the high-strength titanium alloy U-shaped part to enter the gap, moving the first mold part toward the second mold part under the action of the external force, sliding the third mold part into the top of the chute after the first mold part contacts the fixed cavity, pressing the end of the high-strength titanium alloy U-shaped part entering the gap into an arc shape, allowing the other end of the high-strength titanium alloy U-shaped part to enter the fixed cavity under the action of the pressure of the third mold part, and obtaining a high-strength titanium alloy C-shaped part, and carrying out second heat preservation;
step S3, the first die piece is moved in the direction far away from the second die piece under the action of external force, the third die piece enters the bottom of the sliding groove under the action of gravity, the high-strength titanium alloy C-shaped piece is rotated 90 degrees clockwise, the opening of the high-strength titanium alloy C-shaped piece faces downwards, the first die piece is moved in the direction close to the second die piece under the action of external force, after the first die piece contacts the fixed die cavity, the third die piece slides into the top of the sliding groove, the high-strength titanium alloy C-shaped piece enters the fixed die cavity under the action of pressure of the third die piece, two ends of the opening of the high-strength titanium alloy C-shaped piece are closed, and heat preservation is carried out for the third time, so that a high-strength titanium alloy O-shaped piece, namely a high-strength titanium alloy pipe blank is obtained.
Preferably, before the step S1, the method further includes: and (3) pretreating the surfaces of the high-strength titanium alloy plate, the fixed cavity and the third die piece.
Preferably, the method for pretreating the surfaces of the high-strength titanium alloy plate, the fixed cavity and the third mold part comprises the following steps: and spraying a lubricant on the surfaces of the high-strength titanium alloy plate, the fixed cavity and the third die piece.
Preferably, the forming temperature range of the high-strength titanium alloy plate is 550-750 ℃.
Preferably, the time range of the first heat preservation is 30-120s, the time range of the second heat preservation is 30-120s, and the time range of the third heat preservation is 120-600 s.
Preferably, the high strength titanium alloy is Ti55, Ti60, TA15, TA32, TC4 or TC 31.
Compared with the prior art, the processing method of the high-strength titanium alloy tube blank solves the problems of large deformation resistance, easy cracking, serious resilience and the like of the high-strength titanium alloy conical tube blank prepared at room temperature, realizes the integrated technology of blank forming and resilience elimination at high temperature, has simple and convenient process, has the characteristics of high efficiency, low cost, strong controllability, high forming precision, excellent performance and the like compared with the traditional tube forming technology, and has wide application prospect.
Drawings
FIG. 1 is a schematic structural diagram 1 of a processing die for a high-strength titanium alloy tube blank in an embodiment of the invention;
FIG. 2 is a schematic structural diagram 2 of a processing die for a high-strength titanium alloy tube blank in an embodiment of the invention;
fig. 3 is a schematic structural diagram of a first limiting member according to an embodiment of the disclosure;
FIG. 4 is a schematic view of a method for processing a high-strength titanium alloy tube blank according to an embodiment of the invention;
FIG. 5 is a schematic structural diagram of a high-strength titanium alloy plate according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a high-strength titanium alloy conical tube blank prepared from the high-strength titanium alloy plate material in fig. 5.
Description of reference numerals:
1-a first module, 2-a second limiting part, 3-the first limiting part, 4-a pin, 5-a third module, 6-a second module, 7-a temperature measuring hole, 8-a heat preservation box, 9-a limiting boss, 10-a connecting hole, 11-a sliding chute, 12-a high-strength titanium alloy plate, 13-a heating device and 14-a fixed cavity.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
In the description of the present invention, it is to be understood that the forward direction of "X" in the drawings represents the right direction, "the reverse direction of" X "represents the left direction," the forward direction of "Y" represents the upper direction, "the reverse direction of" Y "represents the lower direction," the forward direction of "Z" represents the front direction, "the reverse direction of" Z "represents the rear direction, and the directions or positional relationships indicated by the terms" X "," Y "and" Z "are based on the directions or positional relationships shown in the drawings of the specification, only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. The terms "first", "second" and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of the feature. The description of the term "some specific embodiments" means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. Throughout this specification, the schematic representations of the terms used above do not necessarily refer to the same implementation or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
As shown in fig. 1-6, the embodiment of the invention provides a processing die for a high-strength titanium alloy tube blank, which comprises a first die piece 1, a second die piece 6 and a third die piece 5 connected with the first die piece 1, wherein the first die piece 1 is arranged on the upper part of the second die piece 6,
the third module 5 is connected with the first module 1 through the first limiting piece 3, the third module 5 is connected with the first limiting piece 3 in a sliding mode, the third module 5 is suitable for moving towards the direction close to or away from the second module 6, and the shape of the end face, close to the third module 5, of the first module 1 is matched with the contour shape of the third module 5;
the second die part 6 comprises a fixed cavity 14 which is arranged along the end surface of the second die part 6 close to the first die part 1 and extends in the direction far away from the first die part 1, the shape of the fixed cavity 14 is matched with the outline shape of the third die part 5, the second die part 6 is used for placing a high-strength titanium alloy plate 13 to be processed, and the high-strength titanium alloy plate 13 is suitable for covering the fixed cavity 14.
In the processing die for the high-strength titanium alloy tube blank, the third die piece 5 is connected with the first die piece 1 through the first limiting piece 3, the third die piece 5 is in sliding connection with the first limiting piece 3, namely the third die piece 5 is indirectly driven by the first die piece 1 to move towards the direction close to or away from the second die piece 6, blank forming can be realized only through one set of forming die, the structure is simple, the operation is easy, multi-pass long-time annealing is not needed, and the processing die has the characteristics of high efficiency, low cost, strong controllability, high forming precision, excellent performance and the like, has wide application prospect, and is particularly suitable for forming and processing of high-strength titanium alloy circular tube blanks and conical tube blanks.
In this embodiment, the shapes of the fixed die cavity 14 and the third die piece 5 are not limited, in some specific embodiments, the third die piece 5 is cylindrical, the cross section of the fixed die cavity 14 is arc-shaped with equal radians, the end surface of the first die piece 1 close to the third die piece 5 is arc-shaped with equal radians, and the finally obtained high-strength titanium alloy tube blank is a round tube blank; in other specific embodiments, the end surface of the first mold part 1 close to the third mold part 5 is in an arc shape with gradually increasing or decreasing radian, the cross-sectional shape of the fixed cavity 14 is in an arc shape with gradually increasing or decreasing radian, the third mold part 5 is in a cylindrical shape with gradually increasing or decreasing radius along the length direction of the third mold part 5, and the finally obtained high-strength titanium alloy tube blank is a conical tube blank. In this embodiment, the longitudinal direction of the third mold member 5 is the direction X in the drawing.
It should be noted that in the present embodiment, the third module 5 is connected to the first module 1 through the first limiting member 3, so as to limit the movement of the third module 5 in the left-right direction, that is, to limit the movement of the third module 5 in the X direction in the drawing.
As shown in fig. 3, preferably, a sliding slot 11 is provided on the first limiting member 3, and connecting ends are provided at two ends of the third mold member 5, the connecting ends are adapted to be inserted into the sliding slot 11, and the height of the sliding slot 11 is greater than the height of the connecting ends, so that a gap exists between the first mold member 1 and the third mold member 5 in the Y direction in the figure. In some preferred embodiments, the number of the first limiting members 3 is 2, and the first limiting members are respectively disposed at two ends of the first module 1 and the third module 5 in the length direction, and the two ends of the third module 5 are respectively disposed with a first connecting end and a second connecting end, and the first connecting end and the second connecting end are respectively inserted into the sliding grooves 11 on the first limiting members 3. In this embodiment, the longitudinal direction of the first mold member 1 and the third mold member 5 is the direction X in the drawing.
It should be noted that, in the present embodiment, the sliding groove 11 is extended along the height direction of the first limiting member 3, and is suitable for the third mold member 5 to slide along the height direction of the first limiting member 3, and in the present embodiment, the height direction of the first limiting member 3 is the Y direction in the drawing.
In this embodiment, the height of the slide groove 11 is greater than the height of the connecting end, so that the third mold member 5 slides in height, and the sliding distance is 15-25mm, thereby ensuring the formation.
In this embodiment, the shape of the sliding groove 11 is not limited, as long as the shape of the sliding groove 11 matches the shapes of the first connecting end and the second connecting end, and the third module 5 is suitable for moving along the height direction of the first limiting member 3, and the structure is simple and easy to process. In some preferred embodiments, the shape of the sliding groove 11 is hexagonal, and in other embodiments, the shape of the sliding groove 11 is rectangular, so that the structure is simple and the processing is easy.
Preferably, the first limiting member 3 is provided with a connecting hole 10 connected with the first module 1. In this embodiment, the shape of the connection hole 10 is not limited, and in some preferred embodiments, the connection hole 10 is a regular hexagon, which has a simple structure, a neat and beautiful appearance, and is more firmly connected.
Preferably, the processing mold for the high-strength titanium alloy tube blank further comprises second limiting parts 2, and the two second limiting parts 2 are respectively connected to the front end and the rear end of the first limiting part 3. In the present embodiment, the front end and the rear end of the first stopper 3 are in the direction Z in the drawing.
In this embodiment, the connection manner of the first limiting member 3 and the second limiting member 2 is not limited, and in some preferred embodiments, the first limiting member 3 and the second limiting member 2 are connected by a pin 4, so that the connection is convenient and firm.
Preferably, the second mold part 6 comprises a limit boss 9, the limit boss 9 is arranged on the end surface of the second mold part 6 close to the first mold part 1, the limit boss 9 is a platform which is arranged along the end surface of the second mold part 6 in an upward protruding manner, the two limit bosses 9 are arranged on two sides of the positioning cavity 14, and a high-strength titanium alloy plate 13 is suitable to be placed between the two limit bosses 9. In some preferred embodiments, the height of the limiting boss 9 is the same as the thickness of the high-strength titanium alloy plate 13, so that the position of the high-strength titanium alloy plate 13 on the second die element 6 is more stable, and the phenomenon that the high-strength titanium alloy plate moves to influence the forming is avoided.
Preferably, the second module 6 is provided with a temperature measuring hole 7, and the temperature measuring hole 7 is used for placing a temperature measuring instrument, in some preferred embodiments, the temperature measuring instrument is a thermocouple temperature measuring instrument, so that the temperature sensing is sensitive, and the test is more accurate.
Preferably, the processing die for the high-strength titanium alloy pipe blank further comprises a heating device 12, and the heating device 12 is arranged outside the second die piece 6 and used for heating. The heating device 12 in this embodiment may be any one of an induction coil, a heating rod, or a resistance wire.
Preferably, the processing mold for the high-strength titanium alloy tube blank further comprises an insulation box 8, and the second mold 6 and the third mold 5 are arranged inside the insulation box 8 to ensure the forming temperature. In some preferred embodiments, asbestos is disposed in the incubator 8 to prevent temperature loss and reduce the forming temperature.
Compared with the prior art, the processing die for the high-strength titanium alloy pipe blank indirectly drives the third die piece 5 to move towards or away from the second die piece 6 in the sliding groove 11 through the first die piece 1, so that a gap exists between the first die piece 1 and the third die piece 5, when one end of the high-strength titanium alloy U-shaped piece extends into the gap, two ends of the high-strength titanium alloy U-shaped piece can be simultaneously pressed, springback is reduced, blank forming can be realized only through one set of forming die, the structure is simple, the operation is easy, multi-pass long-time annealing is not needed, and the processing die has the characteristics of high efficiency, low cost, strong controllability, high forming precision, excellent performance and the like, and has a wide application prospect.
As shown in fig. 4, an embodiment of the present invention further provides a method for processing a high strength titanium alloy tube blank, where the processing mold based on the high strength titanium alloy tube blank includes the following steps:
step S1, after the second die piece 6 is heated to the forming temperature of the high-strength titanium alloy plate 13, the high-strength titanium alloy plate 13 is placed between two limiting bosses 9 of the second die piece 6, the first die piece 1 moves towards the direction close to the second die piece 6 under the action of external force, after the third die piece 5 is contacted with the high-strength titanium alloy plate 13, the third die piece 5 slides into the top of the sliding groove 11 and is contacted with the first die piece 1, at the moment, the high-strength titanium alloy plate 13 enters the fixed cavity 14 of the second die piece 6 under the action of the pressure of the first die piece 1, a high-strength titanium alloy U-shaped piece is obtained, and the heat preservation is carried out for the first time; it should be noted that the first mold member 1 moves toward the second mold member 6 by an external force, i.e. the first mold member 1 moves vertically downward by an external force;
step S2, the first die piece 1 is moved to the direction far away from the second die piece 6 under the action of external force, the third die piece 5 enters the bottom of the sliding groove 11 under the action of gravity, a gap is formed between the third die piece 5 and the first die piece 1, the high-strength titanium alloy U-shaped piece is rotated 90 degrees clockwise, one end of the high-strength titanium alloy U-shaped piece enters the gap, the first die piece 1 is moved to the direction close to the second die piece 6 under the action of the external force, after the first die piece 1 contacts the fixed die cavity 14, the third die piece 5 slides into the top of the sliding groove 11, at the moment, one end of the high-strength titanium alloy U-shaped piece entering the gap is pressed to be arc-shaped, the other end of the high-strength titanium alloy U-shaped piece enters the fixed die cavity 14 under the action of the pressure of the third die piece 5, a high-strength titanium alloy C-; it should be noted that the first mould part 1 is moved away from the second mould part 6, i.e. the first mould part 1 is moved vertically upwards;
step S3, the first mold part 1 is moved away from the second mold part 6 under the action of external force, at this time, the third mold part 5 enters the bottom of the chute 11 under the action of gravity, the high-strength titanium alloy C-shaped part is rotated 90 ° clockwise, the opening of the high-strength titanium alloy C-shaped part faces downward, the first mold part 1 is moved toward the second mold part 6 under the action of external force, after the first mold part 1 contacts the fixed cavity 14, the third mold part 5 slides into the top of the chute 11, at this time, the high-strength titanium alloy C-shaped part enters the fixed cavity 14 under the action of pressure of the third mold part 5, both ends of the opening of the high-strength titanium alloy C-shaped part are closed, and heat preservation is performed for the third time, so as to obtain a high-strength titanium alloy O-shaped part, that is, namely, a high.
In this embodiment, the bottom of the chute 11 and the top of the chute 11 are the bottom and the top in the Y direction in the drawing.
In the present embodiment, the U-shaped member, the C-shaped member, and the O-shaped member are all cross-sectional shapes.
Preferably, before step S1, the method further includes: and (3) pretreating the surfaces of the high-strength titanium alloy plate 13, the fixed cavity 14 and the third die piece 5.
Preferably, the method for pretreating the surfaces of the high-strength titanium alloy plate 13, the fixed cavity 14 and the third mold part 5 comprises the following steps: and (3) spraying a lubricant on the surfaces of the high-strength titanium alloy plate 13, the fixed cavity 14 and the third die piece 5. In some preferred embodiments, the lubricant is a boron nitride lubricant, which reduces the friction between the high-strength titanium alloy sheet 13 and the cavity 14 and the third mold part 5 during the hot deformation process, and prevents the oxidation of the high-strength titanium alloy sheet 13 at high temperature.
Preferably, the forming temperature range of the high-strength titanium alloy plate 13 is 550-750 ℃, and the forming effect is good.
Preferably, the time range of the first heat preservation is 30-120s, the time range of the second heat preservation is 30-120s, and the time range of the third heat preservation is 120-600s, so that the rebound is reduced, and the shaping effect is good.
Preferably, the high-strength titanium alloy is Ti55, Ti60, TA15, TA32, TC4 or TC31, has high strength and is more widely applied.
Compared with the prior art, the processing method of the high-strength titanium alloy tube blank solves the problems of large deformation resistance, easy cracking, serious resilience and the like of the high-strength titanium alloy conical tube blank prepared at room temperature, realizes the integrated technology of blank forming and resilience elimination at high temperature, has simple and convenient process, has the characteristics of high efficiency, low cost, strong controllability, high forming precision, excellent performance and the like compared with the traditional tube forming technology, and has wide application prospect.
Example 1
As shown in fig. 5 to 6, an embodiment of the present invention provides a method for processing a high-strength titanium alloy conical shell, including the following steps:
and step S0, unfolding according to the diameter of the neutral layer of the required conical tube blank, cutting a fan-shaped Ti55 high-strength titanium alloy plate 13, and grinding a 15-degree groove on a straight edge section, as shown in figure 5. Spraying boron nitride lubricant on the surface of the Ti55 high-strength titanium alloy plate 13, the fixed cavity 14 and the third die piece 5, on one hand, ensuring that the friction force of the Ti55 high-strength titanium alloy plate 13, the fixed cavity 14 and the third die piece 5 is small in the thermal deformation process, and on the other hand, preventing the Ti55 high-strength titanium alloy plate 13 from being oxidized at high temperature.
Step S1, after the second module 6 is heated to 750 ℃ through an induction coil, the Ti55 high-strength titanium alloy plate 13 is placed between two limiting bosses 9 of the second module 6, the first module 1 moves towards the direction close to the second module 6 under the action of external force, after the third module 5 is contacted with the Ti55 high-strength titanium alloy plate 13, the third module 5 slides into the top of the sliding groove 11 under the action of deformation resistance and is contacted with the first module 1, at the moment, the Ti55 high-strength titanium alloy plate 13 enters the shaping cavity 14 of the second module 6 under the action of the pressure of the first module 1, a Ti55 high-strength titanium alloy U-shaped piece is obtained, heat is preserved for 90S, and springback is reduced; it should be noted that the first mold member 1 moves toward the second mold member 6 by an external force, i.e. the first mold member 1 moves vertically downward by an external force;
step S2, the first die piece 1 is moved in the direction far away from the second die piece 6 under the action of external force, the third die piece 5 enters the bottom of the sliding groove 11 under the action of gravity, a gap of 20mm is formed between the third die piece 5 and the first die piece 1, the Ti55 high-strength titanium alloy U-shaped piece is rotated 90 degrees clockwise, one end of the Ti55 high-strength titanium alloy U-shaped piece enters the gap, the first die piece 1 is moved in the direction close to the second die piece 6 under the action of external force, after the first die piece 1 contacts the fixed die cavity 14, the third die piece 5 slides into the top of the sliding groove 11, at the moment, one end of the Ti55 high-strength titanium alloy U-shaped piece entering the gap is pressed to be arc-shaped, the other end of the Ti55 high-strength titanium alloy U-shaped piece enters the fixed die cavity 14 under the action of the pressure of the third die piece 5, a Ti55 high-strength titanium alloy C-shaped piece is obtained; it should be noted that the first mould part 1 is moved away from the second mould part 6, i.e. the first mould part 1 is moved vertically upwards;
step S3, the first mold part 1 is moved in the direction away from the second mold part 6 under the action of external force, at the moment, the third mold part 5 enters the bottom of the sliding groove 11 under the action of gravity, the Ti55 high-strength titanium alloy C-shaped part is rotated 90 degrees clockwise, the opening of the Ti55 high-strength titanium alloy C-shaped part faces downwards, the first mold part 1 is moved in the direction close to the second mold part 6 under the action of external force, after the first mold part 1 contacts the fixed cavity 14, the third mold part 5 slides into the top of the sliding groove 11, at the moment, the Ti55 high-strength titanium alloy C-shaped part enters the fixed cavity 14 under the action of pressure of the third mold part 5, two ends of the opening of the Ti55 high-strength titanium alloy C-shaped part are closed, and the temperature is kept for 420S, and a Ti55 high-strength titanium alloy O-shaped part, namely a Ti55 high.
In this example, the large end diameter of the high-strength titanium alloy conical shell was 100mm, the small end diameter was 30mm, the wall thickness was 2mm, and the length was 275 mm.
Example 2
The embodiment of the invention provides a method for processing a high-strength titanium alloy round tube blank, which comprises the following steps:
and step S0, unfolding according to the diameter of the neutral layer of the required circular tube blank, cutting out a rectangular TC4 high-strength titanium alloy plate 13, and grinding a 15-degree groove on a straight section. Spraying boron nitride lubricant on the surface of the TC4 high-strength titanium alloy plate 13, the fixed cavity 14 and the third die piece 5, so that the friction force of the TC4 high-strength titanium alloy plate 13, the fixed cavity 14 and the third die piece 5 is small in the thermal deformation process, and the oxidation of the TC4 high-strength titanium alloy plate 13 at high temperature is prevented;
step S1, after the second module 6 is heated to 700 ℃ through an induction coil, the TC4 high-strength titanium alloy plate 13 is placed between two limiting bosses 9 of the second module 6, the first module 1 moves towards the direction close to the second module 6 under the action of external force, after the third module 5 is contacted with the TC4 high-strength titanium alloy plate 13, the third module 5 slides into the top of the sliding groove 11 under the action of deformation resistance and is contacted with the first module 1, at the moment, the TC4 high-strength titanium alloy plate 13 enters the shaping cavity 14 of the second module 6 under the action of the pressure of the first module 1, a TC4 high-strength titanium alloy U-shaped piece is obtained, heat is preserved for 70S, and rebound is reduced; it should be noted that the first mold member 1 moves toward the second mold member 6 by an external force, i.e. the first mold member 1 moves vertically downward by an external force;
step S2, the first die piece 1 is moved in the direction far away from the second die piece 6 under the action of external force, the third die piece 5 enters the bottom of the sliding groove 11 under the action of gravity, a gap of 20mm is formed between the third die piece 5 and the first die piece 1, the TC4 high-strength titanium alloy U-shaped piece is rotated 90 degrees clockwise, one end of the TC4 high-strength titanium alloy U-shaped piece enters the gap, the first die piece 1 is moved in the direction close to the second die piece 6 under the action of external force, after the first die piece 1 contacts the fixed cavity 14, the third die piece 5 slides into the top of the sliding groove 11, at the moment, one end of the TC4 high-strength titanium alloy U-shaped piece entering the gap is pressed to be arc-shaped, the other end of the TC4 high-strength titanium alloy U-shaped piece enters the fixed cavity 14 under the action of the pressure of the third die piece 5, the TC4 high-strength titanium alloy C-shaped piece is obtained, heat; it should be noted that the first mould part 1 is moved away from the second mould part 6, i.e. the first mould part 1 is moved vertically upwards;
step S3, the first mold part 1 is moved in the direction away from the second mold part 6 under the action of external force, at the moment, the third mold part 5 enters the bottom of the sliding groove 11 under the action of gravity, the TC4 high-strength titanium alloy C-shaped part is rotated 90 degrees clockwise, the opening of the TC4 high-strength titanium alloy C-shaped part faces downwards, the first mold part 1 is moved in the direction close to the second mold part 6 under the action of external force, after the first mold part 1 contacts the fixed cavity 14, the third mold part 5 slides into the top of the sliding groove 11, at the moment, the TC4 high-strength titanium alloy C-shaped part enters the fixed cavity 14 under the action of pressure of the third mold part 5, two ends of the opening of the TC4 high-strength titanium alloy C-shaped part are closed, and heat is preserved for 480S, and a TC4 high-strength titanium alloy O-shaped part, namely a TC4 high-.
In this example, the TC4 high-strength titanium alloy circular tube blank had a diameter of 100mm, a wall thickness of 2mm and a length of 275 mm.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (15)
1. A processing die for a high-strength titanium alloy tube blank is characterized by comprising a first die piece (1), a second die piece (6) and a third die piece (5) connected with the first die piece (1), wherein the first die piece (1) is arranged at the upper part of the second die piece (6),
the third module (5) is connected with the first module (1) through a first limiting piece (3), the third module (5) is connected with the first limiting piece (3) in a sliding mode and is suitable for the third module (5) to move towards the direction close to or away from the second module (6), and the shape of the end face, close to the third module (5), of the first module (1) is matched with the outline shape of the third module (5);
the second die part (6) comprises a fixed cavity (14) which is arranged along the end face, close to the first die part (1), of the second die part (6) and extends in the direction far away from the first die part (1), the shape of the fixed cavity (14) is matched with the outline shape of the third die part (5), the second die part (6) is used for placing a high-strength titanium alloy plate (13) to be processed, and the high-strength titanium alloy plate (13) is suitable for covering the fixed cavity (14).
2. A processing die for a high strength titanium alloy tube blank according to claim 1, wherein a sliding groove (11) is formed on the first limiting member (3), connecting ends are formed at two ends of the third mold member (5), the connecting ends are suitable for being inserted into the sliding groove (11), and the height of the sliding groove (11) is greater than that of the connecting ends.
3. A processing die for a high strength titanium alloy tube blank according to claim 1, wherein the first limiting member (3) is provided with a connecting hole (10) connected with the first die member (1).
4. A processing mold for a high strength titanium alloy tube blank according to claim 1, further comprising second limiting members (2), wherein the two second limiting members (2) are respectively connected to the front end and the rear end of the first limiting member (3).
5. A processing mold for a high-strength titanium alloy tube blank according to claim 1, characterized in that the second mold part (6) comprises limiting bosses which are arranged on the end surface of the second mold part (6) close to the first mold part (1), two limiting bosses are arranged on two sides of the positioning cavity (14), and the high-strength titanium alloy plate (13) is suitable to be placed between the two limiting bosses.
6. A processing die for a high-strength titanium alloy tube blank according to claim 1, wherein the second die piece (6) is provided with a temperature measuring hole (7), and the temperature measuring hole (7) is used for placing a temperature measuring instrument.
7. A high strength titanium alloy tube blank processing mold according to claim 1, further comprising a heating device (12), wherein the heating device (12) is arranged outside the second mold member (6).
8. A processing die for a high strength titanium alloy tube blank according to claim 1, further comprising an incubator (8), wherein said second die member (6) and said third die member (5) are disposed inside said incubator (8).
9. A high strength titanium alloy tube blank processing mold according to claim 1, wherein the third mold member (5) is of a cylindrical structure, and the radius of the third mold member (5) is gradually increased or decreased along the length direction of the third mold member (5).
10. A method for processing a high-strength titanium alloy pipe blank, which is based on the processing die of the high-strength titanium alloy pipe blank as claimed in any one of claims 1 to 9, and is characterized by comprising the following steps:
step S1, after a second module (6) is heated to the forming temperature of a high-strength titanium alloy plate (13), the high-strength titanium alloy plate (13) is placed between two limiting bosses of the second module (6), a first module (1) moves towards the direction close to the second module (6) under the action of external force, after a third module (5) is contacted with the high-strength titanium alloy plate (13), the third module (5) slides into the top of a sliding groove (11) and is contacted with the first module (1), and at the moment, the high-strength titanium alloy plate (13) enters a shaping cavity (14) of the second module (6) under the action of the pressure of the first module (1) to obtain a high-strength titanium alloy U-shaped piece and perform primary heat preservation;
step S2, the first die piece (1) is moved to a direction far away from the second die piece (6) under the action of external force, the third die piece (5) enters the bottom of the sliding chute (11) under the action of gravity, a gap is formed between the third die piece (5) and the first die piece (1), the high-strength titanium alloy U-shaped piece is rotated 90 degrees clockwise, one end of the high-strength titanium alloy U-shaped piece enters the gap, the first die piece (1) is moved to a direction close to the second die piece (6) under the action of external force, after the first die piece (1) contacts the fixed die cavity (14), the third die piece (5) slides into the top of the sliding chute (11), one end of the high-strength titanium alloy U-shaped piece entering the gap is pressed to be arc-shaped, and the other end of the high-strength titanium alloy U-shaped piece enters the fixed die cavity (14) under the action of the pressure of the third die piece (5), obtaining a high-strength titanium alloy C-shaped piece, and carrying out secondary heat preservation;
step S3, the first mould part (1) is moved to a direction far away from the second mould part (6) under the action of external force, at the moment, the third mould part (5) enters the bottom of the sliding chute (11) under the action of gravity, the high-strength titanium alloy C-shaped part is rotated 90 degrees clockwise, the opening of the high-strength titanium alloy C-shaped part faces downwards, the first mould part (1) is moved to a direction close to the second mould part (6) under the action of external force, after the first mould part (1) contacts the fixed cavity (14), the third mould part (5) slides into the top of the sliding chute (11), at the moment, the high-strength titanium alloy C-shaped part enters the fixed cavity (14) under the pressure action of the third mould part (5), the two open ends of the high-strength titanium alloy C-shaped part are closed, and heat preservation is carried out for the third time, so that a high-strength titanium alloy O-shaped part is obtained, namely a high-strength titanium alloy tube blank.
11. A method of processing a high strength titanium alloy tube blank according to claim 10, further comprising, before step S1: and (3) pretreating the surfaces of the high-strength titanium alloy plate (13), the fixed cavity (14) and the third die piece (5).
12. A method for processing a high strength titanium alloy tube blank according to claim 11, wherein the method for pretreating the surfaces of the high strength titanium alloy plate material (13), the fixed cavity (14) and the third mould part (5) comprises the following steps: and spraying a lubricant on the surfaces of the high-strength titanium alloy plate (13), the fixed cavity (14) and the third die piece (5).
13. A method for processing a high-strength titanium alloy tube blank according to claim 10, wherein the forming temperature range of the high-strength titanium alloy plate material (13) is 550-750 ℃.
14. A processing method of a high-strength titanium alloy tube blank according to claim 10, characterized in that the time range of the first heat preservation is 30-120s, the time range of the second heat preservation is 30-120s, and the time range of the third heat preservation is 120-600 s.
15. A method of processing a high strength titanium alloy tube blank according to claim 10, wherein the high strength titanium alloy is Ti55, Ti60, TA15, TA32, TC4 or TC 31.
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