EP3717221A1 - Garniture de moule de cuisson - Google Patents
Garniture de moule de cuissonInfo
- Publication number
- EP3717221A1 EP3717221A1 EP18826419.6A EP18826419A EP3717221A1 EP 3717221 A1 EP3717221 A1 EP 3717221A1 EP 18826419 A EP18826419 A EP 18826419A EP 3717221 A1 EP3717221 A1 EP 3717221A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- slots
- chamber
- aluminum
- counterfoil
- matrix
- 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- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/20—Accessories: Details
- B22D17/22—Dies; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies
- B22D17/229—Dies; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies with exchangeable die part
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
- B29C33/3842—Manufacturing moulds, e.g. shaping the mould surface by machining
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/20—Accessories: Details
- B22D17/22—Dies; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/20—Accessories: Details
- B22D17/22—Dies; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies
- B22D17/24—Accessories for locating and holding cores or inserts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/0601—Vulcanising tyres; Vulcanising presses for tyres
- B29D30/0606—Vulcanising moulds not integral with vulcanising presses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/0601—Vulcanising tyres; Vulcanising presses for tyres
- B29D30/0606—Vulcanising moulds not integral with vulcanising presses
- B29D2030/0607—Constructional features of the moulds
- B29D2030/0612—Means for forming recesses or protrusions in the tyres, e.g. grooves or ribs, to create the tread or sidewalls patterns
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2905/00—Use of metals, their alloys or their compounds, as mould material
- B29K2905/02—Aluminium
Definitions
- the present invention relates to the manufacture of a mold member for molding a tread of a tire.
- mold elements are generally made from a matrix of friable material, preferably plaster. To remove the matrix of friable material, it must be destroyed in order to release the mold element obtained.
- This matrix incorporates strips for forming the tread patterns and which will be secured in the mold member during molding thereof. It is only the destruction of the matrix that releases these lamellae.
- the slats must be able to hold in place during the injection of aluminum and exit easily during demolding of the mold member. This is all the more complex when the injection of aluminum is carried out under pressure.
- the object of the invention is to provide a device and a method for manufacturing a mold element for molding a tread that is both reusable and that allows slats to be positioned in the tread element. mold while ensuring both its position during injection pressure and easy removal during demolding of the mold member.
- the device according to the invention is a device for manufacturing a mold element for molding a tread by injection of aluminum under pressure, it is characterized in that it comprises a matrix and a steel counterfoil, said matrix and said counterfoil defining a chamber and that the matrix comprises slots in which are inserted lamellae, said slots having a width greater than the thickness of the lamella so that said slats being able to exit the slot during demolding of the mold member out of the chamber and the slots are blind.
- the width of the slit chosen is a compromise between the strength of the slat during the injection of aluminum under pressure and the ease of demolding of said slat.
- the slots are blind because it allows to limit the depression of the strip because they open only on one side and do not cross the matrix.
- the width of the slit is between 102% and 150% of the thickness of the slat. This game is sufficient to allow easy release of the coverslip.
- the slots may have a width between + 0.01mm and + 0.20mm, preferably +0.030mm and +0.070mm of the thickness of a lamella
- the width of the slit is between 105% and 120% of the thickness of the slat.
- the slots have an insertion depth greater than 4 mm. This minimum depth makes it possible to guarantee the resistance of the lamella during the injection of the aluminum.
- the slots have a depth less than or equal to 25 mm.
- the slots have an insertion depth less than or equal to 12 mm.
- the slots have an insertion depth less than or equal to 8 mm.
- the counterfoil comprises an aluminum inlet channel disposed at the rear of said counterfoil. This position is particularly convenient for injecting aluminum and it leaves the impression of the arrival channel at the rear of the molded part which has no effect on the tread.
- the slats are made of steel.
- the slats are straight.
- the slats are curved
- the corrugated lamellae That is to say that they have a series of curves that can have different heights and that can be longitudinal with respect to the length of the slat. It is possible to combine several shapes of lamellae in the same mold.
- the invention also relates to a method of manufacturing a mold element for molding a tread in the device with at least one of the preceding features, the method is characterized in that it comprises the following steps:
- the slots are made by electroerosion.
- the slots are made by laser machining in a water jet.
- Laser machining in a water jet is described in particular in US patent 2016/0 368 090.
- the filling pressure of the aluminum is between 20 kN and 150 kN.
- the filling phase is divided into two phases: a first phase to bringing the fluid to a first cavity and filling the chamber, a second phase to maintain the pressure in the fluid in the chamber to ensure its proper filling especially during solidification and to compensate for the shrinkage phenomenon.
- a piston keeps the pressure in the chamber.
- the method comprises the implementation of a holding pressure in the chamber, and said holding pressure is greater than the filling pressure.
- the holding pressure of the aluminum is less than 530 kN.
- FIG. 1 is a view of a tool receiving the device for manufacturing a mold element for molding a tread according to the invention
- FIG. 2 is a perspective view of an intermediate counterfoil
- FIG. 3 is a perspective view of a counterform with an aluminum inlet channel
- FIG. 4 is a view of a mold element with a matrix according to the invention.
- the tool 6 illustrated in FIG. 1 comprises two parts 60 and 61 intended to close with each other.
- the part 60 is equipped with a die 2 and the part 61 with a counterfoil 3.
- the die 2 and the counterfoil 3 define a chamber 5.
- This chamber 5 is in the hollow form of the mold element 1.
- the counterfoil 3 comprises an inlet channel 30 disposed at the rear of the counterfoil 3 (FIG. 3) or laterally (FIG. 2).
- the arrival of the lateral casting allows a better filling for complex sculptures and easier to automate.
- the arrival of the casting at the back of the mold is more suitable for simple sculptures.
- the arrival channel 30 passes through the thickness of the counterfoil and opens into the chamber 5.
- the funnel-shaped inlet channel 30 is preceded by a cavity 31 in symmetrical shape with two arms 311 each terminated by a substantially circular space 310.
- Upstream means what is located before in the path of the aluminum under pressure, and downstream what is located after.
- This cavity 31 makes it possible to collect and store at its ends in the spaces 310 the oxides and dirt arriving in the feed channel.
- the matrix 2 is for example made of steel with slots 20 in which steel strips 4 are placed.
- the slots 20 are made by conventional machining, by electroerosion with for example copper electrodes, by laser machining or by laser machining in a water jet.
- the dimensions of the slots 20 are such that there is a clearance between the strip 4 and the slot.
- the slot 20 is sufficiently wide so that each strip 4 is able to exit the slot during demolding of the mold member 1 of the chamber 5 while being sufficiently narrow so that it remains in place during the injection of aluminum under pressure.
- the clearance may be between 0.01mm and 0.20mm depending on the size of the blade and preferably between 0.03mm and 0.07mm.
- the coverslip has a length, a height and a thickness.
- the blade 20 may have different shapes: straight, curved or corrugated in the direction of its length. It can also have a variable height to achieve more or less deep cuts in the tread.
- the manufacturing method of the mold element 1 is broken down as follows:
- the matrix 2 is made of steel
- the matrix 2 is mounted on the part 60 of the tooling 6,
- the mold element 1 is demolded with the slats
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1761278A FR3074079A1 (fr) | 2017-11-28 | 2017-11-28 | Garniture de moule de cuisson |
PCT/FR2018/053016 WO2019106285A1 (fr) | 2017-11-28 | 2018-11-28 | Garniture de moule de cuisson |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3717221A1 true EP3717221A1 (fr) | 2020-10-07 |
Family
ID=61187468
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18826419.6A Withdrawn EP3717221A1 (fr) | 2017-11-28 | 2018-11-28 | Garniture de moule de cuisson |
Country Status (5)
Country | Link |
---|---|
US (1) | US20210016470A1 (fr) |
EP (1) | EP3717221A1 (fr) |
CN (1) | CN111386188A (fr) |
FR (1) | FR3074079A1 (fr) |
WO (1) | WO2019106285A1 (fr) |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1159901A (en) * | 1967-01-24 | 1969-07-30 | Goodyear Tire & Rubber | A Tire Mold Having a Concealed Vent. |
DE2831219C2 (de) * | 1978-07-15 | 1984-03-15 | Maschinenbau HERBERT KG, 6000 Frankfurt | Formsegment, insbesondere für Reifenvulkanisierformen und Verfahren zu seiner Herstellung |
EP0591745A3 (fr) * | 1992-10-07 | 1994-10-12 | Michelin & Cie | Moule pour pneumatiques, et procédé de moulage de pneumatiques. |
US6491854B1 (en) * | 1998-12-10 | 2002-12-10 | The Yokohama Rubber Co., Ltd. | Metallic mold for tire curing and process for producing the same |
JP3297029B2 (ja) * | 1999-11-26 | 2002-07-02 | 日本碍子株式会社 | タイヤ成形用金型の製造方法及び補修方法 |
US7402031B2 (en) * | 2002-05-23 | 2008-07-22 | Kabushiki Kaisha Bridgestone | Piece for tire mold, method of producing the piece, piece-type tire mold and method of producing the piece-type tire mold |
JP2004042505A (ja) * | 2002-07-12 | 2004-02-12 | Ngk Insulators Ltd | タイヤ成形用金型の製造方法 |
CN101376168B (zh) * | 2007-08-31 | 2011-04-20 | 李玉明 | 高压浇铸轮胎模具花纹块时钢片的植入方法 |
CN202621875U (zh) * | 2012-04-19 | 2012-12-26 | 郑恬晨 | 镁合金压铸模横浇道弧锥形尾端 |
US10307864B2 (en) | 2013-12-13 | 2019-06-04 | Avonisys Ag | Methods and systems to keep a work piece surface free from liquid accumulation while performing liquid-jet guided laser based material processing |
-
2017
- 2017-11-28 FR FR1761278A patent/FR3074079A1/fr active Pending
-
2018
- 2018-11-28 WO PCT/FR2018/053016 patent/WO2019106285A1/fr unknown
- 2018-11-28 US US16/766,823 patent/US20210016470A1/en not_active Abandoned
- 2018-11-28 CN CN201880076246.3A patent/CN111386188A/zh active Pending
- 2018-11-28 EP EP18826419.6A patent/EP3717221A1/fr not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
WO2019106285A1 (fr) | 2019-06-06 |
US20210016470A1 (en) | 2021-01-21 |
FR3074079A1 (fr) | 2019-05-31 |
CN111386188A (zh) | 2020-07-07 |
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Legal Events
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