EP2910320A1 - Method for forming hollow parts - Google Patents

Method for forming hollow parts Download PDF

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Publication number
EP2910320A1
EP2910320A1 EP14156235.5A EP14156235A EP2910320A1 EP 2910320 A1 EP2910320 A1 EP 2910320A1 EP 14156235 A EP14156235 A EP 14156235A EP 2910320 A1 EP2910320 A1 EP 2910320A1
Authority
EP
European Patent Office
Prior art keywords
rod material
open end
hollow portion
hollow
forging
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP14156235.5A
Other languages
German (de)
French (fr)
Inventor
Henry Shih
Hung-Shou Chan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SuperAlloy Industrial Co Ltd
Original Assignee
SuperAlloy Industrial 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 SuperAlloy Industrial Co Ltd filed Critical SuperAlloy Industrial Co Ltd
Priority to EP14156235.5A priority Critical patent/EP2910320A1/en
Publication of EP2910320A1 publication Critical patent/EP2910320A1/en
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
    • B21J5/025—Closed die forging
    • 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
    • B21K1/00—Making machine elements
    • B21K1/06—Making machine elements axles or shafts
    • B21K1/063—Making machine elements axles or shafts hollow

Definitions

  • the present invention relates to a method for forming metal parts, and more particularly to a method for forming hollow parts.
  • a conventional method for forming hollow parts includes: providing a rod-like member; drilling a hole at one end of the rod material to make the rod material hollow; injecting liquid into the hole and sealing the hole with a plug; forging the rod material into a part, and pulling the plug out of the hole during forging process; drilling a hole in the formed part again to let out the liquid.
  • the hollow part is formed by drilling hole in the rod material, and drilling hole reduces the integrity of the rod material, which definitely will impair the structural strength of the finished products.
  • the present invention has arisen to mitigate and/or obviate the afore-described disadvantages.
  • the primary objective of the present invention is to provide a method for forming hollow parts at high efficiency.
  • a method for forming hollow parts in accordance with the present invention comprises the following steps:
  • the hollow portion of the finished hollow part is formed by tube drawing without impairing the integrity of the rod material, the mechanical property and the structural strength of the rod material are still maintained during the process of forming the hollow portion. Then the rod material goes through the steps of filling, sealing, forming and drilling to form the hollow part, and the mechanical property and the structural strength of the rod material are not impaired during the whole process of forming the hollow part.
  • the open end is closed by the forging process, which increases the yield rate and improves the structural strength of the finished product.
  • a method for forming hollow parts in accordance with the present invention comprises the following steps:
  • the hollow portion 11 of the finished hollow part is formed by tube drawing without impairing the integrity of the rod material 10, the mechanical property and the structural strength of the rod material 10 are still maintained during the process of forming the hollow portion 11. Then the rod material 10 goes through the steps of filling, sealing, forming and drilling to form the hollow part, and the mechanical property and the structural strength of the rod material are not impaired during the whole process of forming the hollow part.
  • the open end 111 is closed by the forging process, which increases the yield rate and improves the structural strength of the finished product.

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

Abstract

A method for forming hollow parts (30) involves the steps of preparing a rod material; treating the rod material with a tube drawing process to form a hollow portion which has an open end, filling liquid into the hollow portion via the open end; sealing the open end with a plug; forging the rod material which has gone through the steps of filling liquid and sealing the open end into a desired shape, the open end being closed during forging process, and the plug being removed from the open end during the forging process; drilling a discharge hole (12) which is in communication with the hollow portion (11) in the rod material obtained from the step of forging, so as to discharge the liquid out of the hollow portion; and obtaining a hollow part (30) after the liquid is discharged from hollow portion via the discharge hole.

Description

    BACKGROUND OF THE INVENTION Field of the Invention
  • The present invention relates to a method for forming metal parts, and more particularly to a method for forming hollow parts.
    • Description of the Prior Art
  • A conventional method for forming hollow parts includes: providing a rod-like member; drilling a hole at one end of the rod material to make the rod material hollow; injecting liquid into the hole and sealing the hole with a plug; forging the rod material into a part, and pulling the plug out of the hole during forging process; drilling a hole in the formed part again to let out the liquid.
  • Since the hollow part is formed by drilling hole in the rod material, and drilling hole reduces the integrity of the rod material, which definitely will impair the structural strength of the finished products.
  • The present invention has arisen to mitigate and/or obviate the afore-described disadvantages.
    • SUMMARY OF THE INVENTION
  • The primary objective of the present invention is to provide a method for forming hollow parts at high efficiency.
  • To achieve the above objective, a method for forming hollow parts in accordance with the present invention comprises the following steps:
    • preparing a rod material;
    • treating the rod material with a tube drawing process to form a hollow portion which has an open end, the hollow portion being formed by inserting a tube into the rod material, and the rod material being deformed and lengthened during the tube drawing process;
    • filling liquid into the hollow portion via the open end;
    • sealing the open end with a plug;
    • forging the rod material which has gone through the steps of filling liquid and sealing the open end into a desired shape, the open end being closed during forging process, and the plug being removed from the open end during the forging process;
    • drilling a discharge hole which is in communication with the hollow portion in the rod material obtained from the step of forging, so as to discharge the liquid out of the hollow portion; and
    • obtaining a hollow part after the liquid is discharged from hollow portion via the discharge hole.
  • Since the hollow portion of the finished hollow part is formed by tube drawing without impairing the integrity of the rod material, the mechanical property and the structural strength of the rod material are still maintained during the process of forming the hollow portion. Then the rod material goes through the steps of filling, sealing, forming and drilling to form the hollow part, and the mechanical property and the structural strength of the rod material are not impaired during the whole process of forming the hollow part. The open end is closed by the forging process, which increases the yield rate and improves the structural strength of the finished product.
    • BRIEF DESCRIPTION OF THE DRAWINGS
    • Fig. 1 shows a rod material used in the method for forming hollow part in accordance with the present invention;
    • Fig. 2 shows the rod material obtained by the step of rough molding of the method for forming hollow part in accordance with the present invention;
    • Fig. 3 shows the rod material obtained by the step of tube drawing of the method for forming hollow part in accordance with the present invention;
    • Fig. 4 shows the rod material obtained by the steps of filling and sealing of the method for forming hollow part in accordance with the present invention;
    • Fig. 5 shows the final product obtained after the step of forging of the method for forming hollow part in accordance with the present invention; and
    • Fig. 6 is a flow chart showing the steps of the method for forming hollow part in accordance with the present invention.
    DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • The present invention will be clearer from the following description when viewed together with the accompanying drawings, which show, for purpose of illustrations only, the preferred embodiment in accordance with the present invention.
  • Referring to Figs. 1-6, a method for forming hollow parts in accordance with the present invention comprises the following steps:
    • Step A of preparing a rod material: preparing a rod material 10, as shown in Fig. 1;
    • Step B of rough molding: roughly molding the rod material 10 into a rough shape, as shown in Fig. 2;
    • Step C of tube drawing C: the rod material 10 is processed with tube drawing process to form a hollow portion 11 which has an open end 111. The hollow portion 11 is formed by inserting a tube X into the rod material 10, meanwhile, the rod material 10 is deformed and lengthened during the tube drawing process (when the tube X is pulled out);
    • Step D of filling: filling liquid into the hollow portion 11 via the open end 111, as shown in Fig. 4;
    • Step E of sealing: sealing the open end 111 with a plug 20;
    • Step F of forging: forging the rod material 10 which has gone through the steps D and E into a desired shape, the open end 111 is closed during forging process, and the plug 20 is removed from the open end 111 since the pressure applied to the plug 20 changes during the forging process;
    • Step G of drilling: drilling a discharge hole 12 which is in communication with the hollow portion 11 in the rod material 10 obtained from the step F, so as to discharge the liquid out of the hollow portion 11; and
    • Step H of obtaining a hollow part: a hollow part 30 is obtained after the liquid is discharged from hollow portion 11 via the discharge hole 12, as shown in Fig. 5.
  • Since the hollow portion 11 of the finished hollow part is formed by tube drawing without impairing the integrity of the rod material 10, the mechanical property and the structural strength of the rod material 10 are still maintained during the process of forming the hollow portion 11. Then the rod material 10 goes through the steps of filling, sealing, forming and drilling to form the hollow part, and the mechanical property and the structural strength of the rod material are not impaired during the whole process of forming the hollow part. The open end 111 is closed by the forging process, which increases the yield rate and improves the structural strength of the finished product.
  • While we have shown and described various embodiments in accordance with the present invention, it is clear to those skilled in the art that further embodiments may be made without departing from the scope of the present invention.

Claims (2)

  1. A method for forming hollow parts characterized by comprising the following steps:
    step A of preparing a rod material, preparing a rod material (10);
    step C of tube drawing, the rod material (10) is processed with tube drawing process to form a hollow portion (11) which has an open end (111), the hollow portion (11) is formed by inserting a tube (X) into the rod material (10), and the rod material (10) is deformed and lengthened during the tube drawing process;
    step D of filling liquid into the hollow portion (11) via the open end (111);
    step E of sealing, sealing the open end (111) with a plug (20);
    step F of forging the rod material (10) which has gone through the steps D and E into a desired shape, the open end (111) is closed during forging process, and the plug (20) is removed from the open end (111) since the pressure applied to the plug (20) changes during the forging process;
    step G of drilling a discharge hole (12) which is in communication with the hollow portion (11) in the rod material (10) obtained from the step F, so as to discharge the liquid out of the hollow portion (11); and
    step H of obtaining a hollow part, a hollow part (30) is obtained after the liquid is discharged from hollow portion (11) via the discharge hole (12).
  2. The method for forming hollow parts as claimed in claim 1 further comprising a step B of rough molding between the steps of A and C, and the step B is used to roughly mold the rod material into a rough shape.
EP14156235.5A 2014-02-21 2014-02-21 Method for forming hollow parts Withdrawn EP2910320A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP14156235.5A EP2910320A1 (en) 2014-02-21 2014-02-21 Method for forming hollow parts

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14156235.5A EP2910320A1 (en) 2014-02-21 2014-02-21 Method for forming hollow parts

Publications (1)

Publication Number Publication Date
EP2910320A1 true EP2910320A1 (en) 2015-08-26

Family

ID=50193222

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14156235.5A Withdrawn EP2910320A1 (en) 2014-02-21 2014-02-21 Method for forming hollow parts

Country Status (1)

Country Link
EP (1) EP2910320A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110125408A (en) * 2019-05-31 2019-08-16 河冶科技股份有限公司 High alloy mould steel hollow steel ingot injection molding method and hollow steel ingot and high alloy mould steel hollow bloom preparation method
CN110153186A (en) * 2019-05-08 2019-08-23 河冶科技股份有限公司 High alloy mould steel hollow bloom preparation method and high alloy mould steel hollow bloom and tubing and annular cutter

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB605555A (en) * 1944-10-30 1948-07-27 George Oswald Eccles Improvements in or relating to the forging of metals
TW500679B (en) * 2001-01-31 2002-09-01 Superalloy Ind Co Ltd Manufacturing method for reducing weight of hollow bicycle crank
TW555606B (en) * 2001-04-02 2003-10-01 Chuen-Bin Wu Method for manufacturing a hollow metal workpiece with solid ends
US20050050986A1 (en) * 2003-09-09 2005-03-10 Zeng Jie Dong Method for manufacturing integrated bicycle crank arm and spider assembly and the crank arm and spider assembly made thereby
TW201204597A (en) * 2010-07-28 2012-02-01 Superalloy Ind Co Ltd A hollow crank and method for integrally forming the same
TW201242797A (en) * 2011-04-22 2012-11-01 Superalloy Ind Co Ltd Hollow rim spoke integrally formed in one-piece and its manufacturing method

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB605555A (en) * 1944-10-30 1948-07-27 George Oswald Eccles Improvements in or relating to the forging of metals
TW500679B (en) * 2001-01-31 2002-09-01 Superalloy Ind Co Ltd Manufacturing method for reducing weight of hollow bicycle crank
TW555606B (en) * 2001-04-02 2003-10-01 Chuen-Bin Wu Method for manufacturing a hollow metal workpiece with solid ends
US20050050986A1 (en) * 2003-09-09 2005-03-10 Zeng Jie Dong Method for manufacturing integrated bicycle crank arm and spider assembly and the crank arm and spider assembly made thereby
TW201204597A (en) * 2010-07-28 2012-02-01 Superalloy Ind Co Ltd A hollow crank and method for integrally forming the same
TW201242797A (en) * 2011-04-22 2012-11-01 Superalloy Ind Co Ltd Hollow rim spoke integrally formed in one-piece and its manufacturing method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110153186A (en) * 2019-05-08 2019-08-23 河冶科技股份有限公司 High alloy mould steel hollow bloom preparation method and high alloy mould steel hollow bloom and tubing and annular cutter
CN110153186B (en) * 2019-05-08 2021-07-06 河冶科技股份有限公司 Method for preparing high alloy tool and die steel hollow pipe blank, hollow pipe blank and annular cutter
CN110125408A (en) * 2019-05-31 2019-08-16 河冶科技股份有限公司 High alloy mould steel hollow steel ingot injection molding method and hollow steel ingot and high alloy mould steel hollow bloom preparation method

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