CN110026521B - Combined punch device with straight section thick-wall hemispherical end socket - Google Patents
Combined punch device with straight section thick-wall hemispherical end socket Download PDFInfo
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- CN110026521B CN110026521B CN201910428929.7A CN201910428929A CN110026521B CN 110026521 B CN110026521 B CN 110026521B CN 201910428929 A CN201910428929 A CN 201910428929A CN 110026521 B CN110026521 B CN 110026521B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J13/00—Details of machines for forging, pressing, or hammering
- B21J13/02—Dies or mountings therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K21/00—Making hollow articles not covered by a single preceding sub-group
- B21K21/12—Shaping end portions of hollow articles
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- Mechanical Engineering (AREA)
- Forging (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention discloses a combined punch device with a straight section thick-wall hemispherical end socket, belongs to the field of punching equipment, and aims to facilitate demolding. Comprises a core mould and a spherical mould; the spherical mould comprises N mould units, wherein the N mould units are arranged around the central axis of the spherical mould, and the inner cavity surface of the mould unit surrounds to form a conical mould cavity; the core mould comprises a core body matched with the mould cavity, the core body is in movable fit with the mould units along the axial direction of the mould cavity, a connecting structure is arranged between the core body and each mould unit, the core body is movably connected with each mould unit through the connecting structure, and the connecting structure is used as a limiting structure for the axial movement of the core body and each mould unit and a driving structure for the radial movement of each mould unit. According to the invention, the spherical molds are arranged in blocks according to the mold units, and the core body is movably matched with the mold cavity, so that when the core body is lifted up, each mold unit is retracted along the radial direction, a gap is generated between the outer surface of the spherical mold and the inner surface of the hemispherical end socket, and the spherical mold is separated from the inner surface of the end socket forging, thereby facilitating demolding.
Description
Technical Field
The invention belongs to the field of punching, and particularly relates to a combined punch device with a straight section thick-wall hemispherical end socket.
Background
The large thick-wall hemispherical seal head is one of important parts of pressure vessel equipment such as petroleum, chemical engineering, boilers, nuclear power and the like, the requirements on the seal head are correspondingly improved along with the improvement of the design requirements of the equipment, and the seal head is manufactured in a hot stretching integral forming mode for ensuring the stability and safety of key equipment.
The existing die for integrally forming the thick-wall hemispherical end socket by hot stretching is shown in figure 1 and mainly comprises an integral punch 6, a stretching ring, a gasket 5 and the like, the punch with the structure adopts integral design, the problem that the straight section part of the end socket is difficult to demould after hot stretching forming is solved, even if measures such as setting a certain taper at the straight section part of the end socket formed by the punch, spraying a lubricant on the punch before forming and the like are adopted, the problem can not be effectively solved, the end socket can be demoulded smoothly after being placed for a period of time, and the serious demoulding can not be carried out all the time, so that the production efficiency.
Disclosure of Invention
The invention aims to solve the technical problem of providing a combined punch device with a straight section thick-wall hemispherical end socket, which is beneficial to demoulding.
The technical scheme adopted by the invention is as follows: the combined punch device with the straight section thick-wall hemispherical end socket comprises a core die and a spherical die; the spherical mold comprises N mold units, and each mold unit comprises an outer side molding surface and an inner side cavity surface; the N die units are arranged around the central axis of the spherical die, the outer forming surface surrounds the outer surface of the spherical die, and the inner die cavity surface surrounds the tapered die cavity;
the core die comprises a core body, the core body is matched with the die cavity, the core body is in movable fit with the die units along the axial direction of the die cavity, a connecting structure is arranged between the core body and each die unit, the core body is movably connected with each die unit through the connecting structure, and the connecting structure is used as a limiting structure for the axial movement of the core body and each die unit and a driving structure for the radial movement of each die unit.
Further, the connecting structure comprises a hanging plate arranged on the die unit and a lifting lug arranged on the core die; the lifting plate is arranged between the outer side forming surface and the inner side die cavity surface, and the lifting lugs are arranged on the periphery of the core body; the hanging plate is provided with a long round hole, the long round hole extends upwards and inclines towards the outer side of the gravity center of the die unit, and the horizontal distance between two circle centers of the long round hole is delta
A/2,; the lifting lug is provided with a lifting hole; and a pin shaft is arranged between the lifting hole and the long round hole, the pin shaft is movably matched with the long round hole along the length direction of the long round hole, and each die unit is connected with the core body in a rotating matching mode by taking the pin shaft as the center.
Furthermore, the outer side molding surface and the inner side cavity surface of the mold unit surround to form a hollow area, and the hanger plate is positioned in the hollow area and is connected with the outer side molding surface and the inner side cavity surface into a whole.
Furthermore, supporting plates are arranged at two ends of each mould unit along the annular direction of the mould units, the supporting plates are positioned in the hollow area and are connected with the outer side forming surface and the inner side mould cavity surface into a whole, and the supporting plates positioned at two ends of the mould units are symmetrical relative to the hanging plate.
Further, the core body sequentially comprises a cylindrical section, a conical section and a spherical section from top to bottom;
the supporting plate and the hanging plate both comprise inner side faces adjacent to the die cavity, and the inner side faces are cambered surfaces matched with the cylindrical section of the core body.
Further, the core body is an integrally formed part and sequentially comprises a cylindrical section, a conical section and a spherical section from top to bottom; the lifting lug is arranged on the periphery of the cylindrical section.
Further, the vertical distance from the transition surface of the cylindrical section and the conical section to the center of the lifting hole is H1; the vertical distance between two circle centers of the long round hole is H1.
Further, a base is arranged at the top end of the core body; the vertical distance from the circle center of the lifting hole to the bottom surface of the base is H0; the vertical distance between the circle center of the upper long round hole and the upper end surface of the hanging plate is H0.
Further, said N is equal to 3.
Furthermore, a positioning hole which penetrates through the outer side forming surface from the mold cavity is formed in the center of the bottom of the spherical mold.
The invention has the beneficial effects that: according to the invention, the spherical dies are arranged in blocks according to the die units, and the die cavity surrounded by the core body and the die units is movably matched, so that when the core body is pressed down along the axial direction of the die cavity, each die unit expands outwards along the radial direction, the diameter of the spherical die is increased, and the forming of the end socket forging is realized; when the core body is lifted up, each die unit is retracted inwards along the radial direction, a gap is formed between the outer surface of the spherical die and the inner surface of the hemispherical end socket, and the spherical die is separated from the inner surface of the end socket forging piece, so that the demoulding is facilitated.
The assembly of the die unit and the core die is realized through the lifting lugs and the lifting plates, and the lifting holes, the long round holes and the pin shafts are arranged in a shifting gravity center mode, so that the diameter of the spherical die is reduced by means of gravity action, and power source input is not needed.
The spherical die is arranged in blocks according to the die unit, and the hollow area of the die unit is arranged, so that the weight of the spherical die is greatly reduced compared with the weight of the conventional solid punch.
Drawings
FIG. 1 is a schematic diagram of a prior art structure;
FIG. 2 is a schematic structural view of the present invention;
FIG. 3 is a schematic view of a mandrel configuration;
FIG. 4 is a bottom view of FIG. 3;
FIG. 5 is a cross-sectional view A-A of FIG. 4;
FIG. 6 is a schematic structural view of a mold unit;
FIG. 7 is a top view of FIG. 6;
FIG. 8 is a cross-sectional view A-A of FIG. 7;
FIG. 9 is an enlarged view of a portion of FIG. 8 at B;
FIG. 10 is a schematic view of a pressing down state according to the present invention;
FIG. 11 is a schematic view of the present invention in a lifted state.
In the figure, a core die 1, a core body 11, a cylindrical section 111, a conical section 112, a spherical section 113, a base 12, a lifting lug 13, a lifting hole 131, a spherical die 2, a die unit 21, an outer forming surface 211, an inner die cavity surface 212, a die cavity 213, a lifting plate 22, an oblong hole 221, a support plate 23, an inner side surface 231, a positioning hole 24, a pin shaft 3, a seal head forging 4, a gasket 5 and a punch 6.
Detailed Description
The invention is further described below with reference to the following figures and examples:
the combined punch device with the straight section thick-wall hemispherical head, as shown in fig. 2, 3, 4, 5, 6, 7 and 8, comprises a core die 1 and a spherical die 2; the spherical mold 2 comprises N mold units 21, and each mold unit 21 comprises an outer molding surface 211 and an inner mold cavity surface 212; the N die units 21 are arranged around the central axis of the spherical die 2, the outer forming surface 211 surrounds and forms the outer surface of the spherical die 2, and the inner die cavity surface 212 surrounds and forms the tapered die cavity 213;
the core mold 1 comprises a core body 11, the core body 11 is matched with the mold cavity 213, the core body 11 is axially and movably matched with the mold units 21 along the mold cavity 213, a connecting structure is arranged between the core body 11 and each mold unit 21, the core body 11 is movably connected with each mold unit 21 through the connecting structure, and the connecting structure is used as a limiting structure for axial movement of the core body 11 and each mold unit 21 and a driving structure for radial movement of each mold unit 21.
According to the invention, the spherical die 2 is formed by arranging N die units 21 around the central axis of the spherical die 2, the outer side forming surfaces 211 of the N die units 21 surround and form the outer surface of the spherical die 2, the size and the shape of the outer surface are the same as those of the inner surface of the end socket forging 4 to be formed, and the outer surface comprises a circular ring section matched with the straight section of the end socket forging 4 and a spherical section matched with the end socket forging 4 in a spherical shape.
The inner cavity surface 212 encloses a cavity 213 forming a taper, and the cavity 213 is adapted to the core body 11 of the core mold 1, i.e. the core body 11 is inserted into the cavity 213 to form a complete punch. When the core body 11 is driven downwards along the axial direction of the cavity 213, each die unit 21 expands outwards due to the conical structure of the core body 11 and the cavity 213, at the moment, the spherical diameter of the spherical section of the outer surface of the spherical die 2 is equal to the inner diameter of the end socket forging 4, and the outer surface of the spherical die 2 is used for molding the hemispherical end socket; when the core body 11 is driven upwards along the axial direction of the die cavity 213, each die unit 21 contracts along the inner direction under the driving of the connecting structure, at the moment, a gap is generated between the outer surface of the spherical die 2 and the inner surface of the hemispherical end socket, and the spherical die 2 is separated from the inner surface of the end socket forging 4, so that the demolding is facilitated.
The connection structure may be any structure capable of assembling the die unit 21 and the core mold 1, such as a hinge, a bolt, a hook, and the like, and preferably, the connection structure includes a hanger plate 22 provided to the die unit 21 and a hanger 13 provided to the core mold 1; the hanger plate 22 is arranged between the outer molding surface 211 and the inner molding surface 212, and the lifting lugs 13 are arranged on the periphery of the core body 11; as shown in fig. 9, the hanger plate 22 is provided with an elongated circular hole 221, the elongated circular hole 221 extends upward and inclines to the outer side of the center of gravity of the die unit 21, and the horizontal distance between two circle centers of the elongated circular hole 221 is δ/2'; the lifting lug 13 is provided with a lifting hole 131; a pin shaft 3 is arranged between the hanging hole 131 and the long circular hole 221, the pin shaft 3 is movably matched with the long circular hole 221 along the length direction of the long circular hole 221, and each die unit 21 is connected with the core body 11 in a rotating matching mode by taking the pin shaft 3 as the center.
The lifting lugs 13 and the lifting plates 22 are arranged, so that the die unit 21 and the core die 1 can be conveniently assembled, the die unit 21 and the core die 1 are integrated into a whole, and the lifting lugs 13 and the lifting plates 22 are simple in structure, easy to manufacture and small in occupied space. The hanger plate 22 is disposed between the outer molding surface 211 and the inner cavity surface 212, and does not occupy the external space of the mold unit 21, and does not increase the peripheral size of the spherical mold 2, so that the structure of the spherical mold 2 is more compact. Most importantly, the oblong hole 221 which is inclined upwards to the outside of the gravity center on the hanging plate 22 and the pin shaft 3 on the lifting lug 13 are arranged, so that when the core body 11 is lifted upwards, the pin shaft 3 moves from the lower end of the oblong hole 221 to the upper end of the oblong hole 221, the die unit 21 is in a state of being suspended on the core body 11, and at the moment, the horizontal distance of delta/2 is pushed outwards along the radial direction at the hanging position of the die unit 21 and the core body 11, so that the die unit 21 rotates along the pin shaft 3 under the action of gravity, and the distance of delta/2 is contracted inwards along the radial direction without the input of an external power.
Preferably, the outer molding surface 211 and the inner cavity surface 212 of the mold unit 21 surround each other to form a hollow region, and the hanger plate 22 is located in the hollow region and integrally connected to the outer molding surface 211 and the inner cavity surface 212.
The outer molding surface 211 and the inner cavity surface 212 of the die unit 21 surround to form a hollow area, and the weight thereof is greatly reduced as compared with a conventional solid punch. Meanwhile, the hollow area creates a space for installing the hanger plate 22, and the structural compactness of the die unit 21 is ensured.
In order to increase the contact surface between the adjacent mold units 21 and improve the accuracy of the spherical mold formed by the inward shrinkage of each mold unit 21, it is preferable that support plates 23 are disposed at both ends of each mold unit 21 in the circumferential direction of the mold unit 21, the support plates 23 are located in the hollow region and integrally connected to the outer molding surface 211 and the inner cavity surface 212, and the support plates 23 located at both ends of the mold unit 21 are symmetrical with respect to the hanger plate 22.
The support plate 23 increases the contact area of the adjacent mold units 21 so that the degree of occurrence of the misjoint of each mold unit 21 is reduced during the adduction of each mold unit 21. And the support plates 23 at the two ends of each die unit 21 are symmetrical about the hanger plate 22, so that the center of gravity of the die unit 21 is located at the middle position along the circumferential direction thereof, and the die unit 21 is prevented from inclining sideways.
Preferably, the core 11 is an integrally formed part, and sequentially includes a cylindrical section 111, a conical section 112 and a spherical round section 113 from top to bottom.
The core 11 is integrated into one piece spare, can effectively guarantee the accuracy of core 11 size. The conical section 112 of the core 11 is provided to power the horizontal movement of the die unit 21 when the core 11 is pressed down. The conical section 112 of the core 11 cooperates with the inner cavity surface 212 of the die unit 21 to provide a guiding force so that as the core 11 is depressed, the conical section 112 of the core 11 pushes the die unit 21 radially outwardly to expand. While the cylindrical section 111 creates advantages for the mounting of the lifting lug 13.
While the inner side surfaces 231 of the supporting plate 23 and the hanger plate 22 are cambered surfaces adapted to the cylindrical section 111 of the core body 11, as shown in fig. 10 and 11, when the center of gravity of the mold unit 21 is close to the core body 11, the inner side surfaces 231 and the cylindrical section 111 of the core body 11 are naturally attached under the action of gravity, at this time, the conical section 112 of the core body 11 is separated from the mold cavity 213, when the core body is pressed down for a distance H0, the conical section 112 of the core body 11 is attached to the mold cavity 213, the inner side surfaces 231 and the cylindrical section 111 of the core body 11 are separated, the gap is δ/2, and the outer molding surface 211 is moved δ/2 radially outwards; when the core body is lifted for a distance H0, the inner side surface 231 naturally fits with the cylindrical section 111 of the core body 11 under the action of gravity, the outer side forming surface 211 moves delta/2 inwards along the radial direction, a gap delta/2 is formed between the outer side forming surface 211 and the end socket forging 4, and demolding is achieved.
The lifting hole 131 is positioned above the transition surface of the cylindrical section 111 and the conical section 112, and the vertical distance from the transition surface of the cylindrical section 111 and the conical section 112 to the center of the lifting hole 131 is H1; the vertical distance between two circle centers of the long circular hole 221 is H1. The core 11 is moved vertically by as little distance as possible, so that the mold unit 21 can be retracted under the action of gravity.
A base 12 is arranged at the top end of the core body 11; the vertical distance from the circle center of the lifting hole 131 to the bottom surface of the base 12 is H0; the vertical distance between the circle center of the upper long circular hole 221 and the upper end surfaces of the hanging plate 22 and the supporting plate 23 is H0.
By the structure, after the core body 11 is pressed down to the proper position, the base 12 is supported on the supporting plate 23 and the hanging plate 22 to support the core body 11 together, and the stability and reliability of supporting the core body 11 are ensured. Meanwhile, the base 12 is arranged to be conveniently connected with a press machine for providing pressure.
The spherical mold 2 may be composed of 4 or more mold units 21, but for convenience of processing and use, it is preferable that the spherical mold 2 is composed of 3 identical mold units 21 around the central axis of the spherical mold 2.
In order to position the ball die 2 and prevent the combined punch device from deviating from the blank center, it is preferable that a positioning hole 24 penetrating the outer molding surface 211 from the cavity 213 is provided in the center of the bottom of the ball die 2. When the spherical die is used specifically, the spherical die can be firstly installed to the positioning hole 24 and the center of the blank by using the positioning pin, the relative position of the spherical die 2 and the blank is locked, and then the spherical die is subjected to punch forming.
Claims (9)
1. Take combination formula drift device of straight section thick wall hemisphere head, its characterized in that: comprises a core mould (1) and a spherical mould (2); the spherical mold (2) comprises N mold units (21), and each mold unit (21) comprises an outer side molding surface (211) and an inner side mold cavity surface (212); the N die units (21) are arranged around the central axis of the spherical die (2), the outer side forming surface (211) surrounds and forms the outer surface of the spherical die (2), and the inner side die cavity surface (212) surrounds and forms a conical die cavity (213);
the core mold (1) comprises a core body (11), the core body (11) is matched with a mold cavity (213), the core body (11) is in movable fit with the mold units (21) along the axial direction of the mold cavity (213), a connecting structure is arranged between the core body (11) and each mold unit (21), the core body (11) is movably connected with each mold unit (21) through the connecting structure, and the connecting structure is used as a limiting structure for the axial movement of the core body (11) and each mold unit (21) and a driving structure for the radial movement of each mold unit (21);
the connecting structure comprises a hanging plate (22) arranged on the die unit (21) and a lifting lug (13) arranged on the core die (1); the lifting plate (22) is arranged between the outer side molding surface (211) and the inner side die cavity surface (212), and the lifting lugs (13) are arranged on the periphery of the core body (11); the hanging plate (22) is provided with a long circular hole (221), the long circular hole (221) extends upwards and inclines towards the outer side of the gravity center of the die unit (21), and the horizontal distance between two circle centers of the long circular hole (221) is delta/2; a lifting hole (131) is arranged on the lifting lug (13); a pin shaft (3) is arranged between the lifting hole (131) and the long circular hole (221), the pin shaft (3) is movably matched with the long circular hole (221) along the length direction of the long circular hole (221), and each die unit (21) is connected with the core body (11) in a rotating matching mode by taking the pin shaft (3) as the center; the core body (11) is an integrated piece and sequentially comprises a cylindrical section (111), a conical section (112) and a spherical ball section (113) from top to bottom.
2. The modular punch assembly of claim 1, further comprising: the outer forming surface (211) and the inner cavity surface (212) of the die unit (21) surround to form a hollow area, and the hanger plate (22) is located in the hollow area and integrally connected with the outer forming surface (211) and the inner cavity surface (212).
3. The modular punch assembly of claim 2, further comprising: and supporting plates (23) are arranged at two ends of each mould unit (21) along the circumferential direction of the mould units (21), the supporting plates (23) are positioned in the hollow area, are connected with the outer side forming surface (211) and the inner side mould cavity surface (212) into a whole, and are symmetrical about the hanging plate (22) in the supporting plates (23) positioned at two ends of the mould units (21).
4. The modular punch assembly of claim 3 having a straight section thick-walled hemispherical end closure, wherein: the core body (11) sequentially comprises a cylindrical section (111), a conical section (112) and a spherical round ball section (113) from top to bottom;
the supporting plate (23) and the hanging plate (22) both comprise inner side surfaces (231) adjacent to the die cavity (213), and the inner side surfaces (231) are cambered surfaces matched with the cylindrical section (111) of the core body (11).
5. A modular punch assembly with a straight section thick-walled hemispherical head as claimed in any one of claims 1 to 3, wherein: the lifting lug (13) is arranged on the periphery of the cylindrical section (111).
6. The modular punch assembly of claim 5 having a straight section thick-walled hemispherical end closure, wherein: the vertical distance from the transition surface of the cylindrical section (111) and the conical section (112) to the center of the lifting hole (131) is H1; the vertical distance between two circle centers of the long round hole (221) is H1.
7. The modular punch assembly of claim 6, further comprising: a base (12) is arranged at the top end of the core body (11); the vertical distance from the circle center of the lifting hole (131) to the bottom surface of the base (12) is H0; the vertical distance between the circle center of the upper long round hole (221) and the upper end face of the hanging plate (22) is H0.
8. The combined punch device with the straight-section thick-wall hemispherical head as claimed in any one of claims 1 to 4, wherein: said N is equal to 3.
9. The modular punch assembly of claim 8, further comprising: a positioning hole (24) penetrating the outer molding surface (211) through the cavity (213) is formed in the center of the bottom of the spherical mold (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910428929.7A CN110026521B (en) | 2019-05-22 | 2019-05-22 | Combined punch device with straight section thick-wall hemispherical end socket |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910428929.7A CN110026521B (en) | 2019-05-22 | 2019-05-22 | Combined punch device with straight section thick-wall hemispherical end socket |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110026521A CN110026521A (en) | 2019-07-19 |
| CN110026521B true CN110026521B (en) | 2020-06-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910428929.7A Active CN110026521B (en) | 2019-05-22 | 2019-05-22 | Combined punch device with straight section thick-wall hemispherical end socket |
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| Country | Link |
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| CN (1) | CN110026521B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115198753B (en) * | 2022-06-20 | 2023-07-04 | 上海工程技术大学 | Structure, manufacturing mold and application thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0866737A (en) * | 1994-08-31 | 1996-03-12 | Nissan Motor Co Ltd | Forging die and knock out pin therefor |
| CN202877381U (en) * | 2012-10-22 | 2013-04-17 | 兰州兰石重型装备股份有限公司 | Mobile type three-petal fan-shaped punch |
| CN207806507U (en) * | 2017-12-27 | 2018-09-04 | 上海新闵重型锻造有限公司 | A kind of dome head shaping mould with extension pipe |
| CN108637093A (en) * | 2018-04-28 | 2018-10-12 | 中南大学 | A kind of aluminium alloy hemispherical shell warm forming die |
| CN208288905U (en) * | 2017-10-10 | 2018-12-28 | 上海新闵（东台）重型锻造有限公司 | The integrally formed formed punch of nuclear power evaporator end socket |
-
2019
- 2019-05-22 CN CN201910428929.7A patent/CN110026521B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0866737A (en) * | 1994-08-31 | 1996-03-12 | Nissan Motor Co Ltd | Forging die and knock out pin therefor |
| CN202877381U (en) * | 2012-10-22 | 2013-04-17 | 兰州兰石重型装备股份有限公司 | Mobile type three-petal fan-shaped punch |
| CN208288905U (en) * | 2017-10-10 | 2018-12-28 | 上海新闵（东台）重型锻造有限公司 | The integrally formed formed punch of nuclear power evaporator end socket |
| CN207806507U (en) * | 2017-12-27 | 2018-09-04 | 上海新闵重型锻造有限公司 | A kind of dome head shaping mould with extension pipe |
| CN108637093A (en) * | 2018-04-28 | 2018-10-12 | 中南大学 | A kind of aluminium alloy hemispherical shell warm forming die |
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| Publication number | Publication date |
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| CN110026521A (en) | 2019-07-19 |
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