EP1162014A2 - Procédé d'extrusion par pression hydraulique à pression controlée - Google Patents

Procédé d'extrusion par pression hydraulique à pression controlée Download PDF

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Publication number
EP1162014A2
EP1162014A2 EP01304835A EP01304835A EP1162014A2 EP 1162014 A2 EP1162014 A2 EP 1162014A2 EP 01304835 A EP01304835 A EP 01304835A EP 01304835 A EP01304835 A EP 01304835A EP 1162014 A2 EP1162014 A2 EP 1162014A2
Authority
EP
European Patent Office
Prior art keywords
die
material blank
fluid
punch
fluid 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.)
Granted
Application number
EP01304835A
Other languages
German (de)
English (en)
Other versions
EP1162014B1 (fr
EP1162014A3 (fr
Inventor
Hisanobu Kanamaru
Kazub 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
Publication of EP1162014A2 publication Critical patent/EP1162014A2/fr
Publication of EP1162014A3 publication Critical patent/EP1162014A3/fr
Application granted granted Critical
Publication of EP1162014B1 publication Critical patent/EP1162014B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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.
  • Examples of the prior art include forward extrusion methods as shown in Figure 1 of Japanese Laid-Open patent Publication Number 11-254082 and Figure 3 of Japanese Laid-Open Patent Publication Number 7-308729.
  • a material blank 11 progresses through the steps of 3(A), 3(B), 3(C) and 3(D) to produce a manufactured product 15.
  • the manufactured product 15 comprises a throughbore.
  • the blank material 11 also comprises a throughbore for receiving a mandrel in the metal mold.
  • the outer diameter of the material blank 11 is approximately the same size as the inner diameter of a container part 12b of a die 12.
  • Figure 3(C) when the material blank 11 is extruded into the die 12 and molded by a punch 13, a large frictional force is generated between the outer diameter of the material blank and the container.
  • the product 15 rotates as it advances along the die. This rotation generates a large additional frictional force in the direction of rotation as well as the frictional force which is generated in the axial direction as described above.
  • the working load is increased, and there are negative effects on the product precision and on the die life.
  • the outer diameter part of the material blank must be straight. If the outer diameter is tiered, that is to say, the material blank comprises one or more different diameter parts, the smaller diameter part could become deformed and could expand during molding such that the specified molding is not achieved.
  • a fluid pressure is disposed between the die and the material blank.
  • a suitable fluid pressure acts upon the material blank.
  • an aspect of 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 filled 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 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 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.
  • 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.
  • the die 2 includes a cavity 10 having the shape of the desired molded product.
  • the molded product is a helical gear.
  • Teeth 2a are formed on the lower part of a cavity 10, that is to say towards the bottom of the mold 100 in the drawings of Figures 1(A) to 1(D).
  • Teeth 5a of the molded product 5 are formed by teeth 2a.
  • the material blank 1 is supplied to die 2.
  • the material blank 1 is transported to die 2 by a transport device (not shown) and is inserted into a cavity 10 of the die 2.
  • the mandrel 4 is inserted into a central throughbore in the material blank 1.
  • a fluid is supplied to cavity 10. In the present arrangement, oil is used as the fluid.
  • the punch 3 is lowered into cavity 10.
  • the lower end surface of the punch 3 contacts the upper surface of the material blank 1.
  • a fluid pressure chamber 6 is defined and sealed between the punch 3 and the lower portion of the material blank 1.
  • the fluid inside cavity 10 is pressurised.
  • 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 blank 1.
  • the seal 9 must completely seal to prevent leakage of fluid from the fluid pressure chamber 6 to the portion of the die 2 containing the teeth 2a. If the pressurized fluid from fluid pressure chamber 6 penetrates into teeth 2a, the presence of the material 1 may produce partial depressions in teeth 5a of molded product 5. This would prevent achieving the desired shape.
  • the seal 7 may have some leakage without producing any problems.
  • teeth 2a are a helical gear, while molding, material 1 rotates with respect to punch 3.
  • punch 3 advances, a film of fluid penetrates between the teeth 2a and the teeth 5a being formed.
  • the resulting lubrication reduces the frictional force that accompanies this rotation.
  • the pressurized fluid must be actively released. If the fluid pressure in the fluid pressure chamber 6 rises without limit, problems such as rupture of members such as die 2 and the like can occur. 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 an incomplete molding action of the material blank 1. Taking these points into account, it is necessary to determine the clearance for the restriction of seal 8. In this way, the seal 8 acts as a pressure relief valve.
  • the clearance of seal 8 is determined so that an optimal fluid pressure in the fluid pressure chamber 6 is achieved.
  • the molded product 5 inside die 2 is impelled from below by a knockout device (not shown) and is removed from above the die 2. In other words, the molded product is lifted to the top of die 2 by a rotatable lifting member (not shown).
  • a tiered material blank is used, but the present invention can be used for a straight or constant diameter material blank as well.
  • the present invention does not require a throughbore to be provided.
  • 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.
  • 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. As a result, control is easy and stable.
  • the method of 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)
EP01304835A 2000-06-09 2001-06-01 Procédé d'extrusion par pression hydraulique à pression controlée Expired - Lifetime EP1162014B1 (fr)

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
JP2000173006 2000-06-09

Publications (3)

Publication Number Publication Date
EP1162014A2 true EP1162014A2 (fr) 2001-12-12
EP1162014A3 EP1162014A3 (fr) 2002-07-24
EP1162014B1 EP1162014B1 (fr) 2005-03-23

Family

ID=18675310

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01304835A Expired - Lifetime EP1162014B1 (fr) 2000-06-09 2001-06-01 Procédé d'extrusion par pression hydraulique à pression controlée

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

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3382691A (en) * 1964-07-31 1968-05-14 Atomic Energy Authority Uk Hydrostatic extrusion processes
GB1215452A (en) * 1967-02-02 1970-12-09 Atomic Energy Authority Uk Improvements in or relating to hydrostatic extrusion apparatus
US3765222A (en) * 1971-12-30 1973-10-16 Asea Ab Die for hydrostatic extrusion of sections having elongated projections
US3983730A (en) * 1971-08-16 1976-10-05 Battelle Memorial Institute Method of hydrostatic extrusion

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3382691A (en) * 1964-07-31 1968-05-14 Atomic Energy Authority Uk Hydrostatic extrusion processes
GB1215452A (en) * 1967-02-02 1970-12-09 Atomic Energy Authority Uk Improvements in or relating to hydrostatic extrusion apparatus
US3983730A (en) * 1971-08-16 1976-10-05 Battelle Memorial Institute Method of hydrostatic extrusion
US3765222A (en) * 1971-12-30 1973-10-16 Asea Ab Die for hydrostatic extrusion of sections having elongated projections

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
US20010049955A1 (en) 2001-12-13
JP3707768B2 (ja) 2005-10-19
EP1162014B1 (fr) 2005-03-23
EP1162014A3 (fr) 2002-07-24

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