CN112246915B - Titanium alloy hemispherical shell shape correction device and shape correction method thereof - Google Patents
Titanium alloy hemispherical shell shape correction device and shape correction method thereof Download PDFInfo
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- CN112246915B CN112246915B CN202011021014.3A CN202011021014A CN112246915B CN 112246915 B CN112246915 B CN 112246915B CN 202011021014 A CN202011021014 A CN 202011021014A CN 112246915 B CN112246915 B CN 112246915B
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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
- B21D3/00—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts
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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
- B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
- B21D43/003—Positioning devices
Abstract
The invention relates to a shape correcting device for a titanium alloy hemispherical shell, which comprises a core tool, an appearance constraint tool and a locking assembly, wherein a tool base of the core tool is provided with a step surface which can be embedded into an internal profile of the titanium alloy hemispherical shell to be corrected, the step surface is circumferentially provided with a plurality of first through holes, the appearance constraint tool comprises a plurality of arc-shaped tool parts, each tool part comprises a tool appearance constraint surface which is matched with the step surface to tightly press the internal profile, the tool parts are circumferentially provided with a plurality of second through holes, two ends of each tool part are respectively provided with a locking through hole, each locking assembly comprises a first locking bolt for connecting the first through hole and the second through hole and a second locking bolt for connecting the locking through holes in the two adjacent tool parts, the internal profile is tightly pressed in the core tool and the appearance constraint tool through the locking assemblies, and the appearance constraint tool always generates radial acting force on the internal profile in the thermal deformation process, thereby achieving the purpose of shape correction.
Description
Technical Field
The invention relates to the technical field of titanium alloy hemisphere processing, in particular to a shape correcting device and a shape correcting method for a titanium alloy hemisphere shell.
Background
Based on the characteristic that the titanium alloy material has superplasticity, the titanium alloy hemispherical shell is prepared by heating the plate and the die to a specific high-temperature state and adopting a superplastic forming technology at home and abroad. The method for preparing the hemispherical shell has a plurality of advantages, but still has the problem of deformation of the part profile, particularly the profile in the equatorial region. The deformation of the part is caused by the following aspects: firstly, the factors of the preparation process are that the part is required to be taken out in a high-temperature state after superplastic forming, otherwise, the formed part is blocked in a mould and cannot be taken out due to cooling shrinkage. Meanwhile, the hemispherical shell forming preparation process can be continuously carried out at a high temperature, the production efficiency is improved, the temperature of the plate and the mould does not need to be repeatedly increased or decreased, and the process period and the energy loss are saved. But the rigidity of the hemispherical shell is poor at a high temperature, and the hemispherical shell deforms to a certain extent in the workpiece taking process; in addition, the part is taken out of the high-temperature die, the temperature is rapidly reduced, the problem of uneven cooling exists, the cooling rates of different areas are different, the part generates internal stress, and the molded surface of the part is deformed; and secondly, the superplastic forming equipment has the advantages that along with the increase of the service life of the hemispherical shell forming equipment, the precision of a heating system platform is gradually reduced, creep deformation can occur in the use process of a forming die, and the formed part is bound to have deformation to a certain degree. The structure of the final part equator area of the hemispherical shell is complex, but the molded surface of the area is seriously deformed after forming, so that the flexibility and the processing margin of subsequent machining are limited, and the subsequent machining difficulty is increased.
Aiming at the problem of serious deformation of the molded surface of the equatorial region of the titanium alloy hemispherical shell prepared by superplastic forming, the conventional solution at present is to enlarge the envelope range of a formed blank by increasing the initial thickness of a plate and compensate the machining allowance so as to ensure the development of subsequent machining. In addition, in the process of forming the hemispherical shell, the deformation condition of the forming die needs to be monitored, and the deformation of the die is controlled within a certain range by repairing the molded surface of the die.
In the prior art, the method for meeting the follow-up processing requirement of the hemispherical shell is achieved by increasing the initial thickness of the plate and repairing the molded surface of the die, the follow-up processing allowance of the part is large, the repeated monitoring and repairing of the molded surface of the die cannot guarantee the continuous preparation of the part, the processing cost of the part is high, and the production efficiency is low. Besides, in the continuous preparation process of the hemispherical shell, because the precision of the molded surface of the mold is continuously deteriorated, the deformation of the formed part has difference, and the subsequent processing needs to repeatedly trim and process the tool according to the deformation condition of the part, so that the processing difficulty is further increased, and the subsequent processing efficiency is reduced.
Therefore, the inventor provides a titanium alloy hemispherical shell shape correction device and a shape correction method thereof.
Disclosure of Invention
(1) Technical problem to be solved
The embodiment of the invention provides a shape correcting device and a shape correcting method for a titanium alloy hemispherical shell, wherein the shape correcting device is formed by adopting a core tool, an appearance constraint tool and a locking assembly for mutually locking the core tool and the appearance constraint tool, the locking assembly is utilized to tightly press an internal profile of the titanium alloy hemispherical shell to be corrected in the core tool and the appearance constraint tool, and the appearance constraint tool always generates radial acting force on the internal profile in the thermal deformation process, so that the roundness of the external profile of the internal profile tends to the roundness of a step surface in the thermal deformation process, thereby achieving the purpose of shape correction.
(2) Technical scheme
In a first aspect, the embodiment of the invention provides a shape correcting device for a titanium alloy hemispherical shell, which comprises a core tool, an appearance constraint tool and a locking component for locking the core tool and the appearance constraint tool mutually, wherein the core tool comprises an annular tool base, a step surface which can be embedded into an internal profile of the titanium alloy hemispherical shell to be corrected is arranged on the tool base, and a plurality of first through holes are arranged on the step surface along the circumferential direction of the step surface; the shape constraint tool comprises a plurality of arc-shaped tool parts which are sequentially connected end to end along the circumferential direction of the step surface, the tool parts comprise tool shape constraint surfaces which are matched with the step surface to tightly press the internal molded surface, a plurality of second through holes are arranged on the tool parts along the circumferential direction of the tool parts, and two end surfaces of the tool parts are provided with locking through holes; the locking assembly comprises a first locking bolt for connecting the first through hole and the second through hole, and a second locking bolt for connecting the locking through hole on one of the two adjacent tool parts and the locking through hole on the other tool part.
Further, the core frock is still including locating the strengthening rib at frock base center, the step face is including locating on the strengthening rib periphery and imbed to inside vertical step face of titanium alloy hemisphere type casing and locating profile in the frock on the frock base, vertical step face with inside profile clearance sets up, it has a plurality ofly to follow its circumference equipartition on the profile in the frock first through-hole.
Further, a flange process edge on the titanium alloy hemispherical shell is arranged between the inner molded surface of the tool and the lower surface of the tool, a third through hole is arranged on the flange process edge, and the third through hole is mutually locked with the first through hole and the second through hole through the first locking bolt.
Furthermore, the two ends of the tool appearance constraint surface are respectively provided with a tenon and a mortise which are in mortise-tenon connection, the two adjacent tenons are in mortise-tenon connection with the mortise on one tool piece in the tool pieces, the two end surfaces of the tool pieces are provided with a lug in the direction away from the tool appearance constraint surface, and the lug is provided with a locking through hole.
Further, be equipped with on the frock piece with the U type annular that the tongue-and-groove does not communicate, install U type strengthening rib in the U type annular.
Further, the U-shaped annular groove and the mortise are both located on the upper surface of the tool part.
Further, the core tool is made of stainless steel materials, and the shape restraining tool is made of metal materials with small linear expansion coefficients.
In a second aspect, another embodiment of the present invention provides a method for calibrating a titanium alloy hemispherical shell, including: the method comprises the following steps: sleeving a titanium alloy hemispherical shell to be corrected on the mold core tool, then tightly attaching the tool shape constraint surface of each tool piece to the inner profile, sequentially connecting a plurality of tool pieces of the shape constraint tool end to end along the circumferential direction of the step surface, aligning the first through hole with the second through hole, and aligning every two locking through holes on the tool pieces which are connected adjacently; inserting the first locking bolt into the first through hole, the third through hole and the second through hole, inserting the second locking bolt into the two adjacent locking through holes, and adjusting the screwing-in or screwing-out distance between the first locking bolt and the first locking bolt to control the pretightening force of the tool shape constraint surface on the inner profile; placing the titanium alloy hemispherical shell to be corrected and the correction device in a well type heat treatment furnace together, heating to the correction temperature, and then preserving heat for a period of time; and when the temperature in the heat treatment furnace is reduced to a preset temperature, taking out the titanium alloy hemispherical shell to be corrected and the correction device, continuously adjusting the first locking bolt and the second locking bolt to control the pretightening force of the tool appearance constraint surface on the inner profile, and repeating the third step until the formed titanium alloy hemispherical shell is obtained.
Further, before the first step, calculating the size of the titanium alloy hemispherical shell to be corrected at the correction temperature according to the size of the formed titanium alloy hemispherical shell at room temperature, and processing the core tool and the appearance constraint tool according to the size of the titanium alloy hemispherical shell to be corrected.
Further, before the first step, calculating the sizes of the core tool and the exterior constraint tool at the shape correcting temperature according to the size of the titanium alloy hemispherical shell blank, and processing the core tool and the exterior constraint tool according to the size data of the core tool and the exterior constraint tool at the shape correcting temperature.
(3) Advantageous effects
In summary, the invention adopts the core tool, the appearance constraint tool and the shape correction device formed by the locking components for locking with each other, the locking components are utilized to tightly press the inner profiles of the titanium alloy hemispherical core tool and the appearance constraint tool shell to be corrected in the core tool and the appearance constraint tool, the appearance constraint tool always generates radial acting force on the inner profiles in the thermal deformation process, so that the outer roundness of the inner profiles tends to the roundness of a step surface in the thermal deformation process, thereby achieving the purpose of correcting, the tool has simple structure, few components, flexibility, easy implementation and low input cost, improves the appearance accuracy of the hemispherical shell, reduces the thickness of an original plate increased for making up the elliptical deformation, saves the material cost input and reduces the subsequent processing allowance; the mold surface repair cost, the part appearance detection and the forming period are saved, and the continuity of the forming process of the hemispherical shell is ensured; the cost and the period of repeated finishing of the processing tool are saved, and the processing difficulty and the risk are reduced; and the shape correcting process simultaneously eliminates the internal stress generated by uneven cooling of the part. The tightness can be adjusted through bolts, and the follow-up change of the constraint molded surface can be realized after the appearance constraint tool is combined;
drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural view of the present invention.
FIG. 2 is a schematic structural view of the core tooling of the present invention.
Fig. 3 is a schematic structural view of the inventive tooling assembly.
FIG. 4 is an assembly schematic view of the mold core tool and the titanium alloy hemispherical shell to be calibrated.
FIG. 5 is an assembly schematic view of the shape correcting device and the titanium alloy semispherical shell to be corrected.
Fig. 6 is a schematic structural view of the U-shaped reinforcing bar of the present invention.
In the figure:
1-core tooling; 2-an external constraint tool; 3-a second locking bolt; 4-a first locking bolt; 10-titanium alloy hemispherical shell; 11-an annular tooling base; 12-reinforcing ribs; 13-inner profile of the tool; 14-vertical step surface; 15-a first via; 21-assembling a tool piece; 101-an inner profile; 102-flange process edge; 103-a third via; 211-tool outline constraint surface; 212-tenon; 213, mortises; 214-a second via; 215-U-shaped ring groove; 216-U-shaped reinforcing ribs; 217-a bump; 218-locking through hole.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the invention and are not intended to limit the scope of the invention, i.e., the invention is not limited to the embodiments described, but covers any modifications, alterations, and improvements in the parts, components, and connections without departing from the spirit of the invention.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
In a first aspect, fig. 1 is a schematic structural diagram of an embodiment of the present invention, as shown in fig. 1 to 3, the shape calibrating device for a titanium alloy hemispherical shell includes a core tool 1, an exterior constraint tool 2, and a locking component for locking the core tool 1 and the exterior constraint tool 2 to each other, the core tool 1 includes an annular tool base 11, a step surface for attaching to an internal profile 101 of a titanium alloy hemispherical shell 10 to be calibrated is provided on the tool base 11, a plurality of first through holes 15 are arranged on the step surface along a circumferential direction thereof, the exterior constraint tool 2 includes a plurality of arc-shaped tools 21 sequentially connected end to end along the circumferential direction of the step surface, each tool 21 includes a tool exterior constraint surface 211 for pressing the internal profile 101 in cooperation with the step surface, a plurality of second through holes 214 are arranged on the tool 21 along the circumferential direction thereof, two end surfaces of the tool 21 are provided with locking through holes 218, the locking assembly comprises a first locking bolt 4 connecting the first through hole 15 and the second through hole 214, and a second locking bolt 3 connecting the locking through hole on one of the two adjacent tool parts 21 and the locking through hole on the other tool part. It should be noted here that the number of the first through holes 15 is the same as that of the second through holes 214.
According to the invention, the shape correcting device which is composed of the core tool, the shape restraining tool and the locking component for mutually locking the core tool and the shape restraining tool is adopted, the screwing-in and screwing-out distances of the first locking bolt and the second locking bolt of the locking component are adjusted to enable the inner profile of the titanium alloy semispherical shell to be corrected to be always kept tightly pressed in the core tool and the shape restraining tool until the shape restraining surface of the tool is completely attached to the inner profile, and the shape restraining tool always generates radial acting force on the inner profile in the thermal deformation process, so that the roundness of the outer profile of the inner profile tends to the roundness of a step surface in the thermal deformation process, thereby achieving the purpose of correcting the shape.
As a preferred embodiment, as shown in fig. 2, the core tooling 1 further includes a reinforcing rib 12 disposed at the center of the tooling base 11, the step surface includes a vertical step surface 14 disposed on the periphery of the reinforcing rib 12 and embedded into the titanium alloy hemispherical shell 10 and a tooling inner mold surface 13 disposed on the tooling base 11, the vertical step surface 14 is disposed at a gap from the inner mold surface 101, and a plurality of first through holes 15 are uniformly distributed on the tooling inner mold surface 13 along the circumferential direction thereof. Through the arrangement of the gap between the vertical step surface and the inner profile and the embedding of the gap into the titanium alloy hemispherical shell, the part of the aluminum alloy hemispherical shell to be corrected can be ensured to be installed on a mold core tool before the correction, the space of the inner profile with deformation in the correction process is ensured, finally, the inner profile is attached to the vertical step surface under the action of the shape constraint surface to achieve the purpose of correcting, and meanwhile, the titanium alloy hemispherical shell to be corrected has good guiding when being assembled with the mold core tool through the vertical step surface.
As another preferred embodiment, as shown in fig. 4, a flange technical edge 102 on the titanium alloy hemispherical shell 10 is arranged between the inner mold surface 13 of the tool and the lower surface of the tool 21, a third through hole 103 is arranged on the flange technical edge 102, and the third through hole 103, the first through hole 15 and the second through hole 214 are locked to each other by the first locking bolt 4. The third through hole is formed in the flange process edge on the titanium alloy hemispherical shell 10, and the third through hole, the first through hole and the second through hole are aligned with each other, so that the titanium alloy hemispherical shell is conveniently locked between the mold core tool and the appearance constraint tool, and the continuous compression of the appearance constraint surface of the tool to the inner profile is kept by adjusting the first locking bolt and the second locking bolt.
As other alternative embodiments.
Preferably, as shown in fig. 3, a tenon (212) and a mortise (213) connected in a mortise and tenon manner are respectively arranged at two ends of the tool shape constraint surface (211) along the length direction of the tool shape constraint surface, the tenon (212) on one of the two adjacent tool parts (21) is in mortise and tenon connection with the mortise (213) on the other tool part, a protruding block (217) is arranged on two end surfaces of the tool part (21) in the direction away from the tool shape constraint surface (211), and the locking through hole (218) is arranged on the protruding block (217).
Preferably, as shown in fig. 3, a U-shaped ring groove (215) which is not communicated with the mortise (213) is arranged on the tool part (21), and a U-shaped reinforcing rib (216) is installed in the U-shaped ring groove (215).
Preferably, as shown in fig. 3, the U-shaped ring groove (215) and the mortise groove (213) are both located on the upper surface of the tool member (21).
Preferably, as shown in fig. 1, the core tooling (1) is made of stainless steel material, and the shape constraint tooling (2) is made of metal material with small linear expansion coefficient.
In a second aspect, fig. 1 is a schematic structural diagram of an embodiment of the present invention, and as shown in fig. 1 to 3, a titanium alloy hemisphere shell to be corrected is corrected by using the above-mentioned correction device for a titanium alloy hemisphere, the correction method includes,
the method comprises the following steps: sleeving a titanium alloy hemispherical shell to be shaped on the core tool 1, then tightly attaching the tool shape constraint surface 211 of each tool part 21 to the inner profile 101, sequentially connecting a plurality of tool parts 21 of the shape constraint tool 2 end to end along the circumferential direction of the step surface, aligning the first through holes 15 with the second through holes 214, and aligning every two locking through holes 218 on each tool part 21 which is connected adjacently;
step two: inserting a first locking bolt 4 into the first through hole 15 and the second through hole 214, inserting a second locking bolt 3 into the two adjacent locking through holes 218, and adjusting the screwing-in or screwing-out distance between the first locking bolt 4 and the first locking bolt 3 to control the pretightening force of the tool appearance constraint surface 211 on the inner profile 101;
step three: placing the titanium alloy hemispherical shell to be corrected and the correction device in a well type heat treatment furnace together, heating to the correction temperature, and then preserving heat for a period of time;
step four: and when the temperature in the heat treatment furnace is reduced to the preset temperature, taking out the titanium alloy hemispherical shell to be corrected and the correction device, continuously adjusting the first locking bolt 4 and the second locking bolt 3 to control the pretightening force of the tool appearance constraint surface 211 on the inner profile 101, and repeating the third step until the formed titanium alloy hemispherical shell is obtained. The shape correcting temperature is 650-750 deg.C, which is selected according to the characteristics of titanium alloy material in different high temperature states.
As a preferred embodiment, before the step one, the dimension of the titanium alloy hemispherical shell to be calibrated at the calibration temperature is calculated according to the dimension of the titanium alloy hemispherical shell which is molded at room temperature, and the core tool 1 and the appearance constraint tool 2 are processed according to the dimension of the titanium alloy hemispherical shell to be calibrated.
As another preferred embodiment, before the first step, the sizes of the core tooling and the exterior constraint tooling at the shape correcting temperature are calculated according to the size of the titanium alloy hemispherical shell blank, and the core tooling 1 and the exterior constraint tooling 2 are processed according to the size data of the core tooling and the exterior constraint tooling at the shape correcting temperature.
To further describe the innovation point of the invention and to specifically describe the invention by combining the working principle, as shown in fig. 1 to 6, the roundness of the equator area of the TC4 titanium alloy semispherical shell with the sphere diameter SR500mm is selected to be corrected at 650-750 ℃, the inner profile size (i.e. the inner diameter size), the outer profile size (i.e. the outer diameter size) and the profile structure of the equator area of the TC4 titanium alloy semispherical shell at 650-750 ℃ are calculated, the core tooling structure is designed according to the inner profile size and the profile structure of the semispherical shell at the correction temperature, the inner profile is scaled according to the expansion coefficient of a 304 stainless steel wire, the tooling is provided with spoke reinforcing ribs, first through holes are uniformly distributed on the axial plane of the core tooling, the through holes are in the shape of a key groove, the outer profile structure and the profile structure of the semispherical shell at the correction temperature are designed according to the outer profile constraint tooling structure, and scaling the outer molded surface according to the expansion coefficient of the invar steel wire. The appearance constraint tool is composed of four arc-shaped tool parts, the head and the tail of each arc-shaped tool part are respectively provided with a rectangular tenon and a mortise, and the rectangular tenon and the mortise are tangent to the arc-shaped circular surface; processing an arc-shaped U-shaped ring groove on the upper surface of each tooling part, wherein the radian of the U-shaped ring groove is the same as that of the tooling part, and the U-shaped ring groove is used for mounting a U-shaped reinforcing rib; two end faces of the tooling part are provided with through locking through holes along the circumferential direction, bolts (made of the same material as the tooling part) can be inserted into the through holes to circumferentially lock the tooling, a second through hole (the shape of which is the same as that of the first through hole) corresponding to the position of the mold core tooling is arranged on the upper surface of the external constraint tooling, a U-shaped reinforcing rib structure made of high-temperature alloy material is designed and manufactured according to the size of a U-shaped groove of the external constraint tooling in a shape correction temperature state, a third through hole (the shape of which is the same as that of the first through hole and the second through hole) is prepared on a flange process side of a titanium alloy hemispherical shell to be corrected by adopting a water cutting or machining method according to the position and the size of the first through hole or the second through hole, the mold core of the titanium alloy hemispherical shell to be corrected is sleeved on the tooling, the four tooling parts are connected in an end-to-end mortise mode, and then the second fastening bolts penetrate through the locking through holes on the two adjacent tooling parts, the positions of the first through hole, the second through hole and the third through hole are adjusted, the first locking bolt is connected with all the first through hole, the second through hole and the third through hole, the locking nut is matched with the first locking bolt and the second locking bolt to tightly press the inner molded surface on the vertical step surface, radial and axial pre-tightening force is applied to the titanium alloy hemispherical shell to be corrected, after the first locking bolt and the second locking bolt are adjusted, the titanium alloy hemispherical shell to be corrected and the correcting device are stably placed in a pit type heat treatment furnace, a furnace door is closed, a heating system is started, after the average temperature of the heating furnace reaches the correcting temperature, the heat is continuously preserved for 2 hours, then the titanium alloy hemispherical shell to be corrected and the correcting device are cooled along with the furnace, and when the temperature in the heat treatment furnace is reduced to below 50 ℃, the titanium alloy hemispherical shell to be corrected and the correcting device are taken out, and then continuing to adjust the first locking bolt, the second locking bolt and the locking nut, keeping the shape constraint surface of the tool to apply pretightening force to the inner profile of the titanium alloy hemispherical shell, repeating the steps until the shape constraint tool is completely locked to the position (namely the shape constraint surface of the tool is completely attached to the inner profile, and the first locking bolt, the second locking bolt and the locking nut are matched and rotated to the position), and finishing shape correction.
It should be clear that the embodiments in this specification are described in a progressive manner, and the same or similar parts in the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. The present invention is not limited to the specific steps and structures described above and shown in the drawings. Also, a detailed description of known process techniques is omitted herein for the sake of brevity.
The above description is only an example of the present application and is not limited to the present application. Various modifications and alterations to this application will become apparent to those skilled in the art without departing from the scope of this invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (7)
1. A shape correcting device for a titanium alloy hemispherical shell is characterized by comprising a core tool (1), an appearance constraint tool (2) and a locking assembly for mutually locking the core tool (1) and the appearance constraint tool (2),
the mold core tool (1) comprises an annular tool base (11), a step surface capable of being embedded into an inner molded surface (101) of the titanium alloy hemispherical shell (10) is arranged on the tool base (11), and a plurality of first through holes (15) are formed in the step surface along the circumferential direction of the step surface;
the exterior constraint tool (2) comprises a plurality of arc-shaped tool parts (21) which are sequentially connected end to end along the circumferential direction of the step surface, each tool part (21) comprises a tool exterior constraint surface (211) which is matched with the step surface to tightly press the internal profile (101), a plurality of second through holes (214) are arranged on each tool part (21) along the circumferential direction of the tool part, and two end surfaces of each tool part (21) are provided with locking through holes (218);
the locking assembly comprises a first locking bolt (4) for connecting the first through hole (15) and the second through hole (214), and a second locking bolt (3) for connecting a locking through hole on one tool piece of two adjacent tool pieces (21) with a locking through hole on the other tool piece;
the mold core tool (1) further comprises a reinforcing rib (12) arranged at the center of the tool base (11), the step surface comprises a vertical step surface (14) arranged on the periphery of the reinforcing rib (12) and embedded into the titanium alloy hemispherical shell (10) and a tool inner profile (13) arranged on the tool base (11), the vertical step surface (14) and the inner profile (101) are arranged in a clearance mode, a plurality of first through holes (15) are uniformly distributed on the tool inner profile (13) along the circumferential direction of the tool inner profile, a flange process edge (102) on the titanium alloy hemispherical shell (10) is arranged between the tool inner profile (13) and the lower surface of the tool (21), a third through hole (103) is arranged on the flange process edge (102), and the third through hole (103) is mutually locked with the first through hole (15) and the second through hole (214) through the first locking bolt (4), the both ends of frock appearance binding face (211) are equipped with tenon and mortise connection's tenon (212) and mortise (213) respectively along its length direction, adjacent two on one of them frock piece in frock piece (21) tenon (212) and another frock piece mortise (213) mortise and tenon connection, keeping away from on the both ends face of frock piece (21) the direction of frock appearance binding face (211) is equipped with lug (217), be equipped with on lug (217) locking through-hole (218).
2. The shape correcting device for the titanium alloy hemispherical shell as claimed in claim 1, wherein a U-shaped annular groove (215) which is not communicated with the mortise (213) is arranged on the tool part (21), and a U-shaped reinforcing rib (216) is arranged in the U-shaped annular groove (215).
3. The calibrating device for the titanium alloy hemisphere shell according to claim 2, wherein the U-shaped ring groove (215) and the mortise groove (213) are both located on the upper surface of the tool (21).
4. The shape correcting device for the titanium alloy hemispherical shell as claimed in any one of claims 1 to 3, wherein the core tool (1) is made of stainless steel material, and the shape restraining tool (2) is made of metal material with small linear expansion coefficient.
5. A shape correcting method for a titanium alloy hemispherical shell is characterized in that the shape correcting device for the titanium alloy hemispherical shell as claimed in claim 1 is adopted to correct the shape of the titanium alloy hemispherical shell to be corrected, and the shape correcting method comprises the following steps:
the method comprises the following steps: sleeving a titanium alloy hemispherical shell to be shaped on the core tool (1), then tightly attaching tool shape constraint surfaces (211) of the tool parts (21) to the internal profile (101), sequentially connecting a plurality of tool parts (21) of the shape constraint tool (2) end to end along the circumferential direction of the step surface, aligning the first through holes (15) with the second through holes (214), and aligning every two locking through holes (218) on the tool parts (21) which are adjacently connected;
step two: inserting the first locking bolt (4) into the first through hole (15), the third through hole (103) and the second through hole (214), inserting the second locking bolt (3) into the two adjacent locking through holes (218), and adjusting the screwing-in or screwing-out distance of the first locking bolt (4) and the second locking bolt (3) to control the pre-tightening force of the tool appearance constraint surface (211) on the inner profile (101);
step three: placing the titanium alloy hemispherical shell to be corrected and the correction device in a well type heat treatment furnace together, heating to the correction temperature, and then preserving heat for a period of time;
step four: and when the temperature in the heat treatment furnace is reduced to a preset temperature, taking out the titanium alloy hemispherical shell to be corrected and the correction device, continuously adjusting the first locking bolt (4) and the second locking bolt (3) to control the pretightening force of the tool appearance constraint surface (211) on the inner profile (101), and repeating the third step until the formed titanium alloy hemispherical shell is obtained.
6. The method for calibrating the titanium alloy hemispherical shell as claimed in claim 5, wherein before the step one, the dimension of the titanium alloy hemispherical shell to be calibrated at the calibration temperature is calculated according to the dimension of the titanium alloy hemispherical shell which is molded at room temperature, and the core tool (1) and the shape constraint tool (2) are processed according to the dimension of the titanium alloy hemispherical shell to be calibrated.
7. The method for calibrating the titanium alloy hemispherical shell according to claim 6, wherein before the first step, the size of the core tooling and the size of the shape constraint tooling at the calibration temperature are calculated according to the size of the titanium alloy hemispherical shell blank, and the core tooling (1) and the shape constraint tooling (2) are processed according to the size data of the core tooling and the shape constraint tooling at the calibration temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011021014.3A CN112246915B (en) | 2020-09-25 | 2020-09-25 | Titanium alloy hemispherical shell shape correction device and shape correction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011021014.3A CN112246915B (en) | 2020-09-25 | 2020-09-25 | Titanium alloy hemispherical shell shape correction device and shape correction method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112246915A CN112246915A (en) | 2021-01-22 |
| CN112246915B true CN112246915B (en) | 2022-01-07 |
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| DE2913568A1 (en) * | 1978-04-04 | 1979-10-18 | Hokkai Iron Works Co | PROCESS FOR COMPRESSING FLAT METAL WITH RELATIVELY LOW FORMING CAPACITY |
| CN102335754A (en) * | 2011-10-13 | 2012-02-01 | 中国船舶重工集团公司第七二五研究所 | High-precision machining deformation control method for titanium alloy spherical shell |
| CN204276616U (en) * | 2014-11-06 | 2015-04-22 | 航天材料及工艺研究所 | A kind of titanium alloy Loadings On Hemispherical Shell expansive forming mould |
| CN107984175A (en) * | 2017-12-08 | 2018-05-04 | 中国航天科技集团公司长征机械厂 | A kind of processing method of ultra-thin titanium alloy spherical parts |
| CN111390411A (en) * | 2020-03-06 | 2020-07-10 | 中国船舶重工集团公司第七二五研究所 | Titanium alloy arc section barrel welding assembly school shape device |
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| US9188442B2 (en) * | 2012-03-13 | 2015-11-17 | Bei Sensors & Systems Company, Inc. | Gyroscope and devices with structural components comprising HfO2-TiO2 material |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2913568A1 (en) * | 1978-04-04 | 1979-10-18 | Hokkai Iron Works Co | PROCESS FOR COMPRESSING FLAT METAL WITH RELATIVELY LOW FORMING CAPACITY |
| CN102335754A (en) * | 2011-10-13 | 2012-02-01 | 中国船舶重工集团公司第七二五研究所 | High-precision machining deformation control method for titanium alloy spherical shell |
| CN204276616U (en) * | 2014-11-06 | 2015-04-22 | 航天材料及工艺研究所 | A kind of titanium alloy Loadings On Hemispherical Shell expansive forming mould |
| CN107984175A (en) * | 2017-12-08 | 2018-05-04 | 中国航天科技集团公司长征机械厂 | A kind of processing method of ultra-thin titanium alloy spherical parts |
| CN111390411A (en) * | 2020-03-06 | 2020-07-10 | 中国船舶重工集团公司第七二五研究所 | Titanium alloy arc section barrel welding assembly school shape device |
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