US20040154779A1 - Apparatus and method for producing toe caps for safety shoes - Google Patents

Apparatus and method for producing toe caps for safety shoes Download PDF

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Publication number
US20040154779A1
US20040154779A1 US10/477,094 US47709404A US2004154779A1 US 20040154779 A1 US20040154779 A1 US 20040154779A1 US 47709404 A US47709404 A US 47709404A US 2004154779 A1 US2004154779 A1 US 2004154779A1
Authority
US
United States
Prior art keywords
impression
male plug
liquid metal
aluminum
die
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
US10/477,094
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English (en)
Inventor
Claudio Frulla
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.)
Esjotech Srl
Original Assignee
Esjotech Srl
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 Esjotech Srl filed Critical Esjotech Srl
Assigned to ESJOTECH S.R.L. reassignment ESJOTECH S.R.L. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FRULLA, CLAUDIO
Publication of US20040154779A1 publication Critical patent/US20040154779A1/en
Abandoned legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
    • A43B23/00—Uppers; Boot legs; Stiffeners; Other single parts of footwear
    • A43B23/08—Heel stiffeners; Toe stiffeners
    • A43B23/081—Toe stiffeners
    • A43B23/082—Toe stiffeners made of metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D18/00—Pressure casting; Vacuum casting
    • B22D18/02—Pressure casting making use of mechanical pressure devices, e.g. cast-forging
    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43D—MACHINES, TOOLS, EQUIPMENT OR METHODS FOR MANUFACTURING OR REPAIRING FOOTWEAR
    • A43D2200/00—Machines or methods characterised by special features

Definitions

  • the present invention relates to an apparatus for manufacturing toe caps, for safety shoes and the like, made of aluminum, aluminum alloys and light alloys in general, and to the method of manufacturing toe caps.
  • the aim of the present invention is to eliminate the drawbacks noted above, by providing an apparatus for producing toe caps for safety shoes made of aluminum, aluminum alloys and light alloys in general that allows to obtain a toe cap capable of withstanding impact tests and is considerably lighter than corresponding steel toe caps.
  • an object of the invention is to provide a toe cap whose internal structure is practically free from gas with particularly closely arranged molecules, so as to achieve high mechanical strength properties.
  • Another object of the present invention is to provide an apparatus that allows to form the part and in practice to forge it in the plastic state without sprue.
  • Another object of the present invention is to provide an apparatus that allows to obtain a toe cap which, in addition to being nonmagnetic and lightweight, has a low cost.
  • an apparatus for producing toe caps for safety shoes and the like made of aluminum, aluminum alloys and light alloys in general, according to the invention, which comprises a bottom die and a top die which can be associated with respective platens and can be mated so as to form at least one impression, characterized in that it comprises at least one male plug that can be inserted in said impression in order to form the shape of the part being formed and is suitable to act as a flow control element for the duct for introducing the liquid metal in said impression.
  • FIG. 1 is a schematic view of the apparatus according to the invention, with the dies in the open position;
  • FIG. 2 is a view of the apparatus with the dies closed during the step for introducing the liquid metal
  • FIG. 3 is a view of the apparatus during formation of the part by descent of the male plug
  • FIG. 4 is a view of the apparatus during the step of extracting the part from the bottom die
  • FIG. 5 is a view of the apparatus during separation of the part from the male plug
  • FIG. 6 is a schematic view of the resulting part.
  • the apparatus for manufacturing toe caps for safety shoes and the like made of aluminum, aluminum alloys and light alloys in general, according to the invention, comprises a bottom die 1 and a top die 2 , which are respectively associable with a lower platen 3 and with an upper platen 4 .
  • the dies can be mutually mated, by way of the relative motion of the platens and preferably by way of the descent of the upper platen, so as to form an impression 5 .
  • the particularity of the invention consists in that at the impression 5 there is a duct for introducing the liquid metal 10 , which is connected to an assembly for feeding the molten metal 11 , which is temperature-controlled and allows to introduce in the impression 5 pre-dosed quantities of liquid aluminum or aluminum alloys.
  • a male plug 20 which is associated with a movable part 21 of the upper platen 4 constituting motion means for the male plug able to provide, after the introduction of the molten metal inside the impression 5 , the introduction of the male plug forming the exact shape of the part being manufactured; further, the male plug 20 achieves the closure of the inflow duct 10 by means of a flat portion 22 that closes the passage of the duct 10 and allows to form a sprueless part.
  • the male plug 20 defines in practice a flow control element for the duct 10 and also applies a pressure between 500 and 1300 kg/cm 2 so as to perform in practice a forging of the liquid metal, which achieves a plastic deformation of the material before it solidifies and, by applying pressure, more favorable conditions as regards solidification.
  • the bottom die 1 is provided with lower heating resistors 30 and correspondingly the top die 2 is provided with upper heating resistors 31 , which allow optimum temperature control, together with the presence of thermocouples 35 that perform temperature control of the male plug 20 , wherein appropriate heating resistors are provided.
  • the difference between the temperature of the metal before formation and the temperature of the dies that form the impression is preferably as low as possible and is between 150 and 250° C., preferably 200° C.
  • the dies are heated to a preset temperature by means of the electric resistors 30 and 31 , and the metal in the furnace is brought to the required temperature.
  • the upper movable platen descends rapidly until the bottom die and the top die are mutually closed, keeping the male plug 20 partially extracted from the impression 5 .
  • the dosage system for the liquid metal constituted by aluminum and aluminum alloys, is activated in order to introduce a quantity of dosed liquid metal in the impression 5 by means of the inflow duct 10 .
  • the descent of the male plug 20 is activated, under the actuation of the cylinder 21 , which performs a descent at a preset speed and applies a preset pressure.
  • the solidification time begins; during this time, the pressure rises according to a preset criterion in order to forge the part, designated by the reference letter P, which is still in the plastic state.
  • the ejector piston 41 is actuated and acts on the ejector 40 with an upward motion at a preset speed, simultaneously with the actuation for the rise of the upper platen of the press, male plug 20 , up to a preset level.
  • the thicknesses of the resulting part can vary from point to point according to the requirements of mechanical strength of the part, a feature that was not obtainable with conventional methods, which instead started from the pressing of a plate.
  • the materials used, as well as the contingent shapes and dimensions may be any according to requirements.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
  • Forging (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
US10/477,094 2001-05-09 2002-05-02 Apparatus and method for producing toe caps for safety shoes Abandoned US20040154779A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ITMI2001A000949 2001-05-09
IT2001MI000949A ITMI20010949A1 (it) 2001-05-09 2001-05-09 Apparecchiatura per la realizzazione di puntali per scarpe di sucurezza e simili in alluminio sue leghe e leghe leggere in genere nonche' pr
PCT/EP2002/004812 WO2002089625A2 (en) 2001-05-09 2002-05-02 Apparatus and method for producing toe caps for safety shoes

Publications (1)

Publication Number Publication Date
US20040154779A1 true US20040154779A1 (en) 2004-08-12

Family

ID=11447619

Family Applications (1)

Application Number Title Priority Date Filing Date
US10/477,094 Abandoned US20040154779A1 (en) 2001-05-09 2002-05-02 Apparatus and method for producing toe caps for safety shoes

Country Status (14)

Country Link
US (1) US20040154779A1 (sl)
EP (1) EP1385399A2 (sl)
BR (1) BR0205351A (sl)
CA (1) CA2446373A1 (sl)
CZ (1) CZ20033058A3 (sl)
IT (1) ITMI20010949A1 (sl)
MA (1) MA26175A1 (sl)
PL (1) PL366992A1 (sl)
RU (1) RU2003135641A (sl)
SI (1) SI21343A (sl)
SK (1) SK14552003A3 (sl)
TN (1) TNSN03111A1 (sl)
WO (1) WO2002089625A2 (sl)
ZA (1) ZA200308566B (sl)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2319638A3 (de) * 2009-11-04 2012-01-18 Heinrich G. Baumgartner Metall-Druckgussmaschine
WO2016185424A1 (en) * 2015-05-20 2016-11-24 Alustrategy S.R.L. Improvements relating to equipments for the manufacture of articles made of light alloy or similar
US20220125155A1 (en) * 2020-10-23 2022-04-28 Tbl Licensing Llc Strain-Hardened Safety Toe For Footwear

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20020223A1 (it) * 2002-02-07 2003-08-07 Claudio Frulla Apparecchiatura per la realizzazione di oggetti in alluminio leghe dialluminio leghe leggere e simili
ITPD20020167A1 (it) * 2002-06-21 2003-12-22 Bbs Riva Spa Attrezzatura per realizzare oggetti in alluminio, leghe di alluminio,leghe leggere e simili, e procedimento attuato da detta attrezzatura
CA2485846A1 (fr) * 2003-10-24 2005-04-24 Alcox Sarl Procede et machine pour la production de composants en alliage metallique

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1703562A (en) * 1928-01-14 1929-02-26 James E Williams Box toe
US2524057A (en) * 1946-07-18 1950-10-03 Thoger G Jungersen Precision forming of metal
US4977947A (en) * 1989-01-31 1990-12-18 Battelle Memorial Institute Method and a device for homogenizing the intimate structure of metals and alloys cast under pressure
US5194202A (en) * 1990-08-03 1993-03-16 Aluminum Company Of America Formation of ceramic-metal composite by pressure casting and oxidation sintering
US5343927A (en) * 1990-10-05 1994-09-06 Tour & Andersson Ab Method and a device for press casting
US5758711A (en) * 1995-05-26 1998-06-02 Water Gremlin Company Molding apparatus for minimizing shrinkage and voids

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6046856A (ja) * 1983-08-24 1985-03-13 Honda Motor Co Ltd 加圧鋳造法
IT1231211B (it) * 1989-08-24 1991-11-23 Tva Holding Procedimento per la colata a pressione controllata di metalli fusi, particolarmente leghe leggere di alluminio e di magnesio, e apparecchiatura per la sua esecuzione
JPH07227302A (ja) * 1993-12-24 1995-08-29 Nhk Spring Co Ltd 安全靴用先芯

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1703562A (en) * 1928-01-14 1929-02-26 James E Williams Box toe
US2524057A (en) * 1946-07-18 1950-10-03 Thoger G Jungersen Precision forming of metal
US4977947A (en) * 1989-01-31 1990-12-18 Battelle Memorial Institute Method and a device for homogenizing the intimate structure of metals and alloys cast under pressure
US5194202A (en) * 1990-08-03 1993-03-16 Aluminum Company Of America Formation of ceramic-metal composite by pressure casting and oxidation sintering
US5343927A (en) * 1990-10-05 1994-09-06 Tour & Andersson Ab Method and a device for press casting
US5758711A (en) * 1995-05-26 1998-06-02 Water Gremlin Company Molding apparatus for minimizing shrinkage and voids

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2319638A3 (de) * 2009-11-04 2012-01-18 Heinrich G. Baumgartner Metall-Druckgussmaschine
WO2016185424A1 (en) * 2015-05-20 2016-11-24 Alustrategy S.R.L. Improvements relating to equipments for the manufacture of articles made of light alloy or similar
KR20180010188A (ko) * 2015-05-20 2018-01-30 알루스트레테지 에스.알.엘. 경합금 등으로 제조된 물품을 제조하기 위한 설비와 관련된 개선물
US20180133787A1 (en) * 2015-05-20 2018-05-17 Alustrategy S.R.L. Improvements relating to equipment for the manufacture of articles made of light alloy or similar
US10556268B2 (en) 2015-05-20 2020-02-11 Alustrategy S.R.L. Improvements relating to equipment for the manufacture of articles made of light alloy or similar
KR102457903B1 (ko) 2015-05-20 2022-10-21 알루스트레테지 에스.알.엘. 경합금 등으로 제조된 물품을 제조하기 위한 설비와 관련된 개선물
US20220125155A1 (en) * 2020-10-23 2022-04-28 Tbl Licensing Llc Strain-Hardened Safety Toe For Footwear
US11684114B2 (en) * 2020-10-23 2023-06-27 Tbl Licensing Llc Strain-hardened safety toe for footwear

Also Published As

Publication number Publication date
BR0205351A (pt) 2003-09-09
WO2002089625A3 (en) 2003-01-23
SK14552003A3 (sk) 2004-07-07
EP1385399A2 (en) 2004-02-04
CA2446373A1 (en) 2002-11-14
RU2003135641A (ru) 2005-05-27
ITMI20010949A1 (it) 2002-11-09
CZ20033058A3 (cs) 2004-02-18
TNSN03111A1 (en) 2005-04-08
MA26175A1 (fr) 2004-07-01
SI21343A (sl) 2004-06-30
WO2002089625A2 (en) 2002-11-14
PL366992A1 (en) 2005-02-07
ITMI20010949A0 (it) 2001-05-09
ZA200308566B (en) 2004-12-07

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Legal Events

Date Code Title Description
AS Assignment

Owner name: ESJOTECH S.R.L., ITALY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:FRULLA, CLAUDIO;REEL/FRAME:014388/0173

Effective date: 20040130

STCB Information on status: application discontinuation

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