US20010049955A1 - Pressure controlled fluid pressure extrusion method - Google Patents

Pressure controlled fluid pressure extrusion method Download PDF

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Publication number
US20010049955A1
US20010049955A1 US09/827,699 US82769901A US2001049955A1 US 20010049955 A1 US20010049955 A1 US 20010049955A1 US 82769901 A US82769901 A US 82769901A US 2001049955 A1 US2001049955 A1 US 2001049955A1
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US
United States
Prior art keywords
die
fluid
punch
fluid pressure
pressure
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.)
Abandoned
Application number
US09/827,699
Other languages
English (en)
Inventor
Hisanobu Kanamaru
Kazuto Kobayashi
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.)
Aida Engineering Ltd
Original Assignee
Aida Engineering 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 Aida Engineering Ltd filed Critical Aida Engineering Ltd
Assigned to AIDA ENGINEERING CO., LTD. reassignment AIDA ENGINEERING CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KANAMARU, HISANOBU, KOBAYASHI, KAZUTO
Publication of US20010049955A1 publication Critical patent/US20010049955A1/en
Priority to US10/431,114 priority Critical patent/US7284405B2/en
Abandoned legal-status Critical Current

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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
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
    • B21J5/12—Forming profiles on internal or external surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/007—Hydrostatic extrusion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, 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
    • B21C23/04—Making uncoated products by direct extrusion
    • B21C23/08—Making wire, bars, tubes
    • B21C23/10—Making finned tubes
    • 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
    • B21J5/04—Methods for forging, hammering, or pressing; Special equipment or accessories therefor by directly applied fluid pressure or explosive action
    • 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
    • B21K1/066—Making machine elements axles or shafts splined
    • 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
    • B21K1/12—Making machine elements axles or shafts of specially-shaped cross-section
    • 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
    • B21K1/28—Making machine elements wheels; discs
    • B21K1/30—Making machine elements wheels; discs with gear-teeth

Definitions

  • the present invention relates to a pressure controlled fluid pressure extrusion method.
  • fluid pressure extrusion method defines a method in which extrusion is conducted under the action of fluid pressure. Pressure control describes the adjustment of this fluid pressure in order to conduct proper extrusion.
  • These extrusions can be used to make parts for automobiles such as helical gears and the like.
  • Examples of the prior art include forward extrusion methods as shown in FIG. 1 of Japanese Laid-Open Patent Publication Number 11-254082 and FIG. 3 of Japanese Laid Open Patent Publication Number 7-308729.
  • FIGS. 3 (A)- 3 (D) the essentials of these prior art methods are schematically shown in order to compare these methods of the prior art with the present invention.
  • a material 11 progresses through the steps of 3 (A), 3 (B), 3 (C), and 3 (D) to produce a manufactured product 15 . Because the example of product 15 is perforated, material 11 is also perforated and a mandrel present in the metal mold.
  • the outer diameter of material 11 is approximately the same size as the inner diameter of a container 12 b .
  • FIG. 3(C) when material 11 is extruded into a die 12 and molded by a punch 13 , a large frictional force is generated between the material outer diameter and the container. Furthermore, when molding helical gear part 15 a of manufactured product 15 with a helical gear part 12 a of die 12 , product 15 rotates as it advances along a lead. This rotation adds a large additional frictional force in the direction of rotation as well as the frictional force in the axial direction as described above. As a result, the load needed for working is increased, and there are negative effects on the product precision and on the die life. With this method, the outer diameter part of the material must be straight. If the outer diameter is tiered, the smaller diameter part could become deformed and expand during molding, and the specified molding cannot be conducted.
  • the first object of the present invention is to lengthen the life of the die.
  • the second object is to improve product precision.
  • a fluid pressure is disposed between the die and the material.
  • a suitable fluid pressure acts upon the material.
  • the present invention provides a fluid pressure molding method in which the lower part of a material to be molded forms a lower seal with a die.
  • a punch applying a molding force to the material forms an upper seal with the perimeter of the die.
  • the space between the upper and lower seals forms a pressure chamber that is filed with a fluid.
  • the lower seal is a complete seal to prevent leakage of fluid into the die.
  • the upper seal is given a clearance with the die that permits controlled leakage of fluid therepast at a rate that limits the maximum pressure in the pressure chamber while permitting the development of an adequate pressure on the material being molded.
  • a suitable fluid pressure acts on the outer perimeter surface of a material, the material is pushed directly by a punch into a die for molding, whereby the material is molded into a desired shape.
  • the fluid is suitably sealed by the material, the die, and the punch.
  • the action of the die and the punch compresses and pressurizes the fluid.
  • the fluid pressure acts on the material to form the product.
  • the fluid pressure is adjusted by a clearance of the die and the punch.
  • FIGS. 1 (A) through 1 (D) are drawings of the steps in the process according to an embodiment of the invention.
  • FIG. 2 is an expanded view of the principal part of FIG. 1(B).
  • FIGS. 3 (A) through 3 (D) are drawings illustrating the method of the prior art.
  • a metal mold 100 is constructed from a die 2 , a punch 3 , and a mandrel 4 .
  • the metal mold 100 is set into a conventional press (not shown).
  • the metal mold 100 is actuated by the ascending and descending motion of a slide of the press.
  • die 2 includes a cavity 10 having the shape of the desired molded product.
  • the molded product is a helical gear.
  • Teeth 2 a are formed on the lower part of cavity 10 .
  • Teeth 5 a of molded product 5 are formed by teeth 2 a.
  • material 1 is supplied to die 2 .
  • Material 1 is transported to die 2 by a transport device and is inserted into cavity 10 of die 2 .
  • mandrel 4 is inserted into the hole of material 1 .
  • a fluid is supplied to cavity 10 .
  • oil is used as the fluid.
  • punch 3 is lowered into cavity 10 .
  • the lower end surface of punch 3 contacts the upper surface of material 1 .
  • a fluid pressure chamber 6 is sealed between the punch 3 and the lower portion of the material 1 .
  • the fluid inside cavity 10 is compressed.
  • the fluid is sealed by a first seal 7 at the contact surface between material 1 and punch 3 , a second seal 8 at the insertion surface between die 2 and punch 3 , and a third seal 9 at the insertion surface between die 2 and the lower end of material 1 .
  • Seal 9 must completely seal to prevent leakage of fluid from fluid pressure chamber 6 to the portion of the die 2 containing the teeth 2 a . If the pressurized fluid from fluid pressure chamber 6 penetrates into teeth 2 a , the presence of the material 1 may produce partial depressions in teeth 5 a of molded product 5 . This would prevent achieving the desired shape.
  • Seal 7 may have some leakage without producing any problems.
  • teeth 2 a are a helical gear
  • material 1 rotates with respect to punch 3 .
  • punch 3 advances, a film of fluid penetrates between the teeth 2 a and the teeth 5 a being formed.
  • the resulting lubrication reduces the frictional force that accompanies this rotation.
  • seal 8 With seal 8 , the pressurized fluid must be actively released. If the fluid pressure in fluid pressure chamber 6 rises without limit, there can be problems such as the rupture of members such as die 2 and the like. However, if a large amount of fluid in fluid pressure chamber 6 leaks from seal 8 , material 1 expands radially. This can cause problems such as incomplete molding action of material 1 . Taking these points into account, it is necessary to determine the clearance for the restriction of seal 8 . Seal 8 acts as a relief valve.
  • the clearance of seal 8 is determined so that an optimal fluid pressure of fluid pressure chamber 6 is achieved.
  • molded product 5 inside die 2 is impelled from below by a knockout device (not shown) and is removed from above die 2 .
  • the molded product is lifted to the top of die 2 by a rotatable lifting member.
  • a tiered material is used, but the present invention can be used for a straight material as well. Although there is a hole in the center of the molded product, the present invention does not require a hole.
  • the molded product is a helical gear, but the present invention can be used for molded parts with super gears or with no gears as well.
  • the load needed for molding is reduced.
  • the stress on the die is reduced, and product precision is improved.
  • advantages such as having a die with a long life and conserving energy.
  • even if there is a space between the die and the material there is no deformation of the material.
  • extrusion of tiered materials becomes possible.
  • the cross-section reduction rate for the extrusion is small, and the molding load is further reduced.
  • the fluid pressure in fluid pressure chamber 6 is controlled by the clearance of seal 8 .
  • control is easy and stable.
  • the present invention permits molding of parts that have heretofore been considered difficult to process.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Forging (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
  • Powder Metallurgy (AREA)
US09/827,699 2000-06-09 2001-04-06 Pressure controlled fluid pressure extrusion method Abandoned US20010049955A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US10/431,114 US7284405B2 (en) 2000-06-09 2003-05-06 Pressure controlled fluid pressure extrusion method

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2000173006A JP3707768B2 (ja) 2000-06-09 2000-06-09 圧力コントロール液圧押出方法
JP2000-173006 2000-06-09

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US10/431,114 Continuation-In-Part US7284405B2 (en) 2000-06-09 2003-05-06 Pressure controlled fluid pressure extrusion method

Publications (1)

Publication Number Publication Date
US20010049955A1 true US20010049955A1 (en) 2001-12-13

Family

ID=18675310

Family Applications (1)

Application Number Title Priority Date Filing Date
US09/827,699 Abandoned US20010049955A1 (en) 2000-06-09 2001-04-06 Pressure controlled fluid pressure extrusion method

Country Status (5)

Country Link
US (1) US20010049955A1 (fr)
EP (1) EP1162014B1 (fr)
JP (1) JP3707768B2 (fr)
CA (1) CA2343685C (fr)
DE (1) DE60109519T2 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101449270B1 (ko) * 2013-04-17 2014-10-10 한국생산기술연구원 헬리컬 기어 후가공 공정을 포함하는 헬리컬 기어 제조방법
TWI622490B (zh) * 2014-10-21 2018-05-01 王正平 精密擠切成形機
TWI722949B (zh) * 2020-07-30 2021-03-21 瑋瑩實業有限公司 鉚合螺帽之斜紋成型模具結構

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1111351A (en) * 1964-07-31 1968-04-24 Atomic Energy Authority Uk Improvements in or relating to hydrostatic extrusion processes
GB1215452A (en) * 1967-02-02 1970-12-09 Atomic Energy Authority Uk Improvements in or relating to hydrostatic extrusion apparatus
SE361270B (fr) * 1971-12-30 1973-10-29 Asea Ab
US3983730A (en) * 1971-08-16 1976-10-05 Battelle Memorial Institute Method of hydrostatic extrusion

Also Published As

Publication number Publication date
DE60109519T2 (de) 2006-04-13
CA2343685C (fr) 2006-07-04
JP2001347336A (ja) 2001-12-18
CA2343685A1 (fr) 2001-12-09
DE60109519D1 (de) 2005-04-28
JP3707768B2 (ja) 2005-10-19
EP1162014A2 (fr) 2001-12-12
EP1162014B1 (fr) 2005-03-23
EP1162014A3 (fr) 2002-07-24

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Legal Events

Date Code Title Description
AS Assignment

Owner name: AIDA ENGINEERING CO., LTD., JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KANAMARU, HISANOBU;KOBAYASHI, KAZUTO;REEL/FRAME:011719/0045

Effective date: 20010329

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION