LU508587B1 - Composite extrusion forming apparatus for conical bodies and extrusion forming method - Google Patents

Composite extrusion forming apparatus for conical bodies and extrusion forming method

Info

Publication number
LU508587B1
LU508587B1 LU508587A LU508587A LU508587B1 LU 508587 B1 LU508587 B1 LU 508587B1 LU 508587 A LU508587 A LU 508587A LU 508587 A LU508587 A LU 508587A LU 508587 B1 LU508587 B1 LU 508587B1
Authority
LU
Luxembourg
Prior art keywords
blank
die
extrusion forming
stripper plate
conical
Prior art date
Application number
LU508587A
Other languages
German (de)
Inventor
Zijun Wang
Renjie Yu
Jinxiong Dong
Jie Liu
Nian Yang
Yekun Feng
Original Assignee
Norinco Group Air Ammunition Res Institute Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Norinco Group Air Ammunition Res Institute Co Ltd filed Critical Norinco Group Air Ammunition Res Institute Co Ltd
Application granted granted Critical
Publication of LU508587B1 publication Critical patent/LU508587B1/en

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Classifications

    • 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
    • B21J13/08—Accessories for handling work or tools
    • B21J13/14—Ejecting devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/02—Making uncoated products
    • B21C23/03—Making uncoated products by both direct and backward extrusion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C25/00—Profiling tools for metal extruding
    • B21C25/02—Dies
    • 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
    • B21K21/06—Shaping thick-walled hollow articles, e.g. projectiles

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)

Abstract

The invention discloses a composite extrusion forming apparatus for conical bodies and an extrusion forming method. A die is installed in a prestress ring, an ejector pin is inserted in a bottom hole of the die, a blank positioning ring is installed in a top hole of the die, and a stripper plate fixing plate is installed on a top of the die and a top of the prestress ring. The method comprises: of, placing the blank positioning ring on the top of the die; placing a blank into the die; taking out the blank positioning ring and installing a stripper plate in the stripper plate fixing plate, activating a punch to move downward to extrude the blank, moving the punch upward to exit a cavity of the die; and taking out the stripper plate, and ejecting a part. The invention belongs to the technical field of metal thermoforming.

Description

1 LU508587
DESCRIPTION
COMPOSITE EXTRUSION FORMING APPARATUS FOR CONICAL
BODIES AND EXTRUSION FORMING METHOD
Background of the Present Invention
The invention relates to an extrusion forming apparatus and an extrusion forming method, in particular to a composite extrusion forming apparatus for conical bodies and an extrusion forming method, belonging to the technical field of metal thermoforming.
Description of Related Arts
Conical metal structural components are widely used in projectile launches and aircraft structures. Conical materials typically include high-strength steel, high-temperature alloys, and other materials that are difficult to process, which necessitate high dimensional accuracy for the parts due to their functional requirements. However, their structure makes forming these parts challenging. Generally, the final part shape is achieved through direct cutting from bar stock, or by machining extruded blanks obtained from extrusion forming.
The former results in significant material waste and low production efficiency, which does not align with the principles of green manufacturing and is detrimental to cost control. In contrast, the latter method offers relatively higher material utilization and production efficiency. However, conventional extrusion forming methods often lead to tilting of extruded blanks, compromising the accuracy of extrusion forming and potentially causing blank fractures, necessitating larger machining allowances after extrusion. Therefore, there is a need to develop new high-precision extrusion forming methods to improve the accuracy of extrusion forming, reduce machining allowances, and enhance material utilization.
Summary of the Present Invention
The purpose of the invention is to address the issue of tilting of extruded blanks during extrusion forming, which compromises the accuracy of extrusion forming and
2 LU508587 potentially causes blank fractures, necessitating larger machining allowances after extrusion. Consequently, the invention provides a composite extrusion forming apparatus for conical bodies and an extrusion forming method.
The technical scheme adopted by the invention is as follows.
A composite extrusion forming apparatus for conical bodies comprises a punch and a die, and further comprises a stripper plate fixing plate, a blank positioning ring, a prestress ring and an ejector pin, wherein the die is installed in the prestress ring, the ejector pin is inserted in a bottom hole of the die, the blank positioning ring is installed in a top hole of the die, and the stripper plate fixing plate is installed on a top of the die and a top of the prestress ring.
Further, the composite extrusion forming apparatus for conical bodies further comprises a stripper plate, wherein the stripper plate is an annular plate, and the stripper plate is detachably installed on the stripper plate fixing plate.
Further, an annular groove is radially machined on an inner side wall of the stripper plate fixing plate, and the stripper plate is installed in the annular groove of the stripper plate fixing plate.
Further, the stripper plate fixing plate is an annular sleeve, the prestress ring is an annular cylinder, the die is a circular cylinder, a central hole of the circular cylinder is composed of a conical hole and a circular hole which are connected, the blank positioning ring is a conical sleeve, an outer circular surface of the conical sleeve is a conical surface, and a central hole of the conical sleeve is a circular through hole.
Further, the die is installed on an inner side wall of the prestress ring, the conical surface of the blank positioning ring is installed in the top conical hole of the die, and the ejector pin is installed in the circular hole of the die.
An extrusion forming method using the composite extrusion forming apparatus for conical bodies is realized according to the following steps:
Step 1, placing the blank positioning ring on a top of the conical hole of the die;
3 LU508587
Step 2, placing a blank into the die through the blank positioning ring, so that the ejector pin fits into a groove at a bottom of the blank and a top of the blank coincides with a bottom of the blank positioning ring:
Step 3, taking out the blank positioning ring and installing the stripper plate in the mounting groove of the stripper plate fixing plate;
Step 4, activating the punch to move downward to extrude the blank, allowing the material at the bottom of the blank to flow downward while the material on the top flows upward, ultimately filling a cavity of the die with the blank;
Step 5, moving the punch upward to exit the cavity of the die; and
Step 6, taking out the stripper plate, and making the ejector pin move upward to eject a part from the cavity of the die.
Further, in Step 2, the blank is put into the die through the blank positioning ring, and a length of coincidence L between the top of the blank and the bottom of the blank positioning ring ranges from 5 mm to 10 mm.
Further, when the blank is put into the die in Step 2, the blank is structured as an integrated component with an inverted truncated cone segment at the bottom and a cylindrical segment at the top, a height of the cylindrical segment is H1, and a height of the inverted truncated cone segment is H2, with a ratio of H1 to H2 ranging from 5:3 to 5:4.
Further, a depth of the groove at the bottom of the blank in Step 2 is 15-20 mm.
Compared with the prior art, the invention has the following advantages.
The invention employs a composite hot extrusion forming method to achieve precise forming of a double-sided cavity conical body. The use of the blank positioning ring allows for accurate initial positioning of the blank when placed in the die, ensuring it remains coaxial with the die. The blank has a shape comprising a cylindrical segment of a certain length and a truncated cone segment, which helps maintain a stable center of gravity of the blank during the extrusion process while ensuring a high material utilization rate. Additionally, the outer surface of the truncated cone segment of the blank fits closely with the inner wall of the die, and the bottom groove of the blank cooperates with the ejector pin, both serving to position the blank during extrusion, reliably preventing any tilting of the blank and ensuring that the finished part is axisymmetrical. This improves the
4 LU508587 accuracy of extrusion forming, reduces the machining allowance for final shaping, increases material utilization, and lowers manufacturing costs.
Brief Description of the Drawings
Fig. 1 is a schematic view of a double-sided cavity conical part 8;
Fig. 2 is a schematic view of a blank 4;
Fig. 3 is a structural diagram of a high-precision composite extrusion forming apparatus for a double-sided cavity conical body;
Fig. 4 is a schematic view of a blank 4 placed in a die 5;
Fig. 5 is a schematic view depicting the installation of a stripper plate after the removal of a blank positioning ring 3.
Fig. 6 is a schematic view of an initial state before extrusion forming; and
Fig. 7 is a schematic view of a final state after extrusion forming.
Detailed Description of the Preferred Embodiment
Embodiment 1: This embodiment will be described with reference to Figs. 3-7. A composite extrusion forming apparatus for conical bodies in this embodiment comprises a punch 1 and a die 5, and further comprises a stripper plate fixing plate 2, a blank positioning ring 3, a prestress ring 6 and an ejector pin 7, wherein the die 5 is installed in the prestress ring 6, the ejector pin 7 is inserted in a bottom hole of the die 5, the blank positioning ring 3 is installed in a top hole of the die 5, and the stripper plate fixing plate 2 is installed on a top of the die 5 and a top of the prestress ring 6.
In this embodiment, the punch 1 is used to create a cavity at a top of an extruded part, and the blank positioning ring 3 is placed at a top of an inner cavity of die 5 to ensure that the blank 4 is centered within the die 5 before extrusion and remains vertical.
Embodiment 2: This embodiment will be described with reference to Figs. 5-7. A composite extrusion forming apparatus for conical bodies in this embodiment further comprises a stripper plate 21, wherein the stripper plate 21 is an annular plate, the stripper plate 21 is detachably installed on the stripper plate fixing plate 2, and the stripper plate 21 is installed in a mounting groove of the stripper plate fixing plate 2 for stripping of the extruded part 8. Other components and connections are the same as those in Embodiment 1.
Embodiment 3: This embodiment will be described with reference to Figs. 5-7.
According to a composite extrusion forming apparatus for conical bodies in this embodiment, an annular groove is radially machined on an inner side wall of the stripper plate fixing plate 2, and the stripper plate 21 is installed in the annular groove of the stripper plate fixing plate 2. Other components and connections are the same as those in
Embodiment 2.
Embodiment 4: This embodiment will be described with reference to Figs. 5-7.
According to a composite extrusion forming apparatus for conical bodies in this embodiment, the stripper plate fixing plate 2 is an annular sleeve, the prestress ring 6 is an annular cylinder, the die 5 is a circular cylinder, a central hole of the circular cylinder is composed of a conical hole and a circular hole which are connected, the blank positioning ring 3 is a conical sleeve, an outer circular surface of the conical sleeve is a conical surface, and a central hole of the conical sleeve is a circular through hole. Other components and connections are the same as those in Embodiment 1.
Embodiment 5: This embodiment will be described with reference to Fig. 5.
According to a composite extrusion forming apparatus for conical bodies in this embodiment, the die 5 is installed on an inner side wall of the prestress ring 6, the conical surface of the blank positioning ring 3 is installed in the top conical hole of the die 5, and the ejector pin 7 is installed in the circular hole of the die 5.
A top of the ejector pin 7 is integrally provided with a cylindrical protrusion, a disc- shaped body and a bottom end, the cylindrical protrusion fits into a groove 41, the disc- shaped body is installed in the circular hole of the blank positioning ring 3, and the ejector pin 7 is used for ejecting the extruded part 8 out of the die 5. Other components and connections are the same as those in Embodiment 1.
Embodiment 6: This embodiment will be described with reference to Figs. 2-7. An extrusion forming method using the composite extrusion forming apparatus for conical bodies in this embodiment is realized according to the following steps:
Step 1, placing the blank positioning ring 3 on a top of the conical hole of the die 5;
6 LU508587
Step 2, placing a blank 4 into the die 5 through the blank positioning ring 3, so that the ejector pin 7 fits into a groove 41 at a bottom of the blank 4 and a top of the blank 4 coincides with a bottom of the blank positioning ring 3;
Step 3, taking out the blank positioning ring 3 and installing the stripper plate 21 in the mounting groove of the stripper plate fixing plate 2;
Step 4, activating the punch 1 to move downward to extrude the blank 4, allowing the material at the bottom of the blank to flow downward while the material on the top flows upward, ultimately filling a cavity of the die with the blank;
Step 5, moving the punch 1 upward to exit the cavity of the die 5; and
Step 6, taking out the stripper plate 21, and making the ejector pin 7 move upward to eject a part 8 from the cavity of the die 5.
Embodiment 7: This embodiment will be described with reference to Fig. 4.
According to the extrusion forming method using the composite extrusion forming apparatus for conical bodies in this embodiment, in Step 2, the blank 4 is put into the die 5 through the blank positioning ring 3, and a length of coincidence L between the top of the blank 4 and the bottom of the blank positioning ring 3 ranges from 5 mm to 10 mm. This technical scheme allows for accurate initial positioning of the blank 4 when placed in the die 5, ensuring it remains coaxial with the die 5. Other components and connections are the same as those in Embodiment 6.
Embodiment 8: This embodiment will be described with reference to Figs. 5-7.
According to the extrusion forming method using the composite extrusion forming apparatus for conical bodies in this embodiment, when the blank 4 is put into the die 5 in
Step 2, the blank 4 is structured as an integrated component with an inverted truncated cone segment at the bottom and a cylindrical segment at the top, a height of the cylindrical segment is H1, and a height of the inverted truncated cone segment is H2, with a ratio of
H1 to H2 ranging from 5:3 to 5:4. This technical scheme helps maintain a stable center of gravity of the blank during the extrusion process while ensuring a high material utilization rate. Other components and connections are the same as those in Embodiment 6.
Embodiment 9: This embodiment will be described with reference to Figs. 5-7.
According to the extrusion forming method using the composite extrusion forming
7 LU508587 apparatus for conical bodies in this embodiment, a depth of the groove 41 at the bottom of the blank 4 in Step 2 is 15-20 mm. By adopting the above technical scheme, after the blank 4 is put into the die 5, a clearance fit is formed between the bottom groove 41 and the ejector pin 7. This, along with the fit between the truncated cone segment of the blank and the die, ensures that the blank does not tilt during the extrusion, resulting in an axially symmetric extruded part. Other components and connections are the same as those in
Embodiment 6.
Although the invention has been disclosed by means of preferred embodiments, they are not intended to limit the invention. Any person skilled in the art, without deviating from the scope of the technical scheme of the invention, may utilize the disclosed structure and technical details to make slight alterations or modifications that constitute equivalent variations, which are still considered within the scope of the technical scheme of the invention.

Claims (9)

8 LU508587 CLAIMS
1. A composite extrusion forming apparatus for conical bodies, comprising a punch (1) and a die (5), and further comprising a stripper plate fixing plate (2), a blank positioning ring (3), a prestress ring (6) and an ejector pin (7), wherein the die (5) is installed in the prestress ring (6), the ejector pin (7) is inserted in a bottom hole of the die (5), the blank positioning ring (3) is installed in a top hole of the die (5), and the stripper plate fixing plate (2) is installed on a top of the die (5) and a top of the prestress ring (6).
2. The composite extrusion forming apparatus for conical bodies according to claim 1, further comprising a stripper plate (21), wherein the stripper plate (21) is an annular plate, and the stripper plate (21) is detachably installed on the stripper plate fixing plate (2).
3. The composite extrusion forming apparatus for conical bodies according to claim 2, wherein an annular groove is radially machined on an inner side wall of the stripper plate fixing plate (2), and the stripper plate (21) is installed in the annular groove of the stripper plate fixing plate (2).
4. The composite extrusion forming apparatus for conical bodies according to claim 1, wherein the stripper plate fixing plate (2) is an annular sleeve, the prestress ring (6) is an annular cylinder, the die (5) is a circular cylinder, a central hole of the circular cylinder is composed of a conical hole and a circular hole which are connected, the blank positioning ring (3) is a conical sleeve, an outer circular surface of the conical sleeve is a conical surface, and a central hole of the conical sleeve is a circular through hole.
5. The composite extrusion forming apparatus for conical bodies according to claim 4, wherein the die (5) is installed on an inner side wall of the prestress ring (6), the conical surface of the blank positioning ring (3) is installed in the top conical hole of the die (5), and the ejector pin (7) is installed in the circular hole of the die (5).
9 LU508587
6. An extrusion forming method using the composite extrusion forming apparatus for conical bodies according to any one of claims 1-5, wherein the method is realized according to the following steps: step 1, placing the blank positioning ring (3) on a top of the conical hole of the die (5); step 2, placing a blank (4) into the die (5) through the blank positioning ring (3), so that the ejector pin (7) fits into a groove (41) at a bottom of the blank (4) and a top of the blank (4) coincides with a bottom of the blank positioning ring (3); step 3, taking out the blank positioning ring (3) and installing the stripper plate (21) in the mounting groove of the stripper plate fixing plate (2); step 4, activating the punch (1) to move downward to extrude the blank (4), allowing the material at the bottom of the blank to flow downward while the material on the top flows upward, ultimately filling a cavity of the die with the blank; step 5, moving the punch (1) upward to exit the cavity of the die (5); and step 6, taking out the stripper plate (21), and making the ejector pin (7) move upward to eject a part (8) from the cavity of the die (5).
7. The extrusion forming method using the composite extrusion forming apparatus for conical bodies according to claim 6, wherein in step 2, the blank (4) is put into the die (5) through the blank positioning ring (3), and a length of coincidence L between the top of the blank (4) and the bottom of the blank positioning ring (3) ranges from 5 mm to 10 mm.
8. The extrusion forming method using the composite extrusion forming apparatus for conical bodies according to claim 6, wherein when the blank (4) is put into the die (5) in step 2, the blank (4) is structured as an integrated component with an inverted truncated cone segment at the bottom and a cylindrical segment at the top, a height of the cylindrical segment is H1, and a height of the inverted truncated cone segment is H2, with a ratio of H1 to H2 ranging from 5:3 to 5:4.
9. The extrusion forming method using the composite extrusion forming apparatus for conical bodies according to claim 6, wherein a depth of the groove (41) at the bottom of the blank (4) in step 2 is 15-20 mm.
LU508587A 2024-02-04 2024-08-19 Composite extrusion forming apparatus for conical bodies and extrusion forming method LU508587B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202410157186.5A CN120421358A (en) 2024-02-04 2024-02-04 Cone composite extrusion forming device and extrusion forming method

Publications (1)

Publication Number Publication Date
LU508587B1 true LU508587B1 (en) 2025-08-08

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ID=95830042

Family Applications (1)

Application Number Title Priority Date Filing Date
LU508587A LU508587B1 (en) 2024-02-04 2024-08-19 Composite extrusion forming apparatus for conical bodies and extrusion forming method

Country Status (4)

Country Link
CN (1) CN120421358A (en)
LU (1) LU508587B1 (en)
WO (1) WO2025161351A1 (en)
ZA (1) ZA202407896B (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102371287B (en) * 2010-08-26 2013-04-17 哈尔滨建成集团有限公司 Extrusion die and method for extrusion molding inside and outside reduction blank by same
CN103567249B (en) * 2013-10-31 2015-07-22 中北大学 Extrusion moulding combined mould of large long-cone horn cylinder member
CN104070129B (en) * 2014-06-06 2017-04-12 济南中森机械制造有限公司 Hot extrusion forging die for pipe with flange and deep blind taper hole shaft and forging technology thereof
CN116493531A (en) * 2023-04-26 2023-07-28 天津航天长征技术装备有限公司 Extrusion forming process and die for a horseshoe-shaped special-shaped cross-section die forging

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ZA202407896B (en) 2025-05-28
CN120421358A (en) 2025-08-05
WO2025161351A1 (en) 2025-08-07

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Effective date: 20250808