EP1334785A1 - Verfahren zum Herausarbeiten einer Giessform aus einem Sandblock und Verwendung des Verfahrens - Google Patents

Verfahren zum Herausarbeiten einer Giessform aus einem Sandblock und Verwendung des Verfahrens Download PDF

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Publication number
EP1334785A1
EP1334785A1 EP02075515A EP02075515A EP1334785A1 EP 1334785 A1 EP1334785 A1 EP 1334785A1 EP 02075515 A EP02075515 A EP 02075515A EP 02075515 A EP02075515 A EP 02075515A EP 1334785 A1 EP1334785 A1 EP 1334785A1
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EP
European Patent Office
Prior art keywords
moulding
machining
tool
block
form part
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Withdrawn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
EP02075515A
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English (en)
French (fr)
Inventor
Mogens Rasmussen
Nils Paaske
Henning Moller Pedersen
Jan Marcussen
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X-Tend ApS
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X-Tend ApS
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 X-Tend ApS filed Critical X-Tend ApS
Priority to EP02075515A priority Critical patent/EP1334785A1/de
Publication of EP1334785A1 publication Critical patent/EP1334785A1/de
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D47/00—Casting plants
    • B22D47/02—Casting plants for both moulding and casting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C13/00—Moulding machines for making moulds or cores of particular shapes
    • B22C13/02—Moulding machines for making moulds or cores of particular shapes equipped with templates, e.g. for sweeping operation
    • B22C13/04—Moulding machines for making moulds or cores of particular shapes equipped with templates, e.g. for sweeping operation with rotary templates, e.g. arranged on a pillar
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/02—Sand moulds or like moulds for shaped castings
    • 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

Definitions

  • the present invention relates to a method of machining a mould from a block of sand and use of such method.
  • the invention also relates to a moulding tool obtained by the performance of the method.
  • the sand grains which are released by the machining of the block of sand, must be removed, in order to obtain a cavity of the desired shape. If the sand that is cut-away is not removed correctly, this may compromise the result of the machining process and consequently the quality of the form part.
  • the object of the present invention is to provide a solution overcoming the above-identified drawbacks with the techniques known in the art.
  • Another object of the invention is to provide a method of the initially mentioned kind and a use thereof allowing for a less time and cost consuming production of form parts for a moulding tool for foundry operations, such as injection moulding tools, and/or other kinds of object forming operations.
  • a method of machining a mould from a block of granular moulding material for moulding in a foundry operation including machining a form part from a block of granular moulding material, such as sand including a binder, a cavity by using a machining tool, said machining tool being moved relative to the block of moulding material, said movements controlled by a geometric data from a computer control means to form the cavity; and removing the granular material removed from the block by the machining tool during the machining of the cavity.
  • the accuracy of the cavity machined in the block of sand is improved, since the sand grains released by the machining tool is quickly removed from the cavity.
  • the provision of a constant flow of oil which functions not only as a coolant but also for conveying the chips away from the engagement area of the machining tool is not possible due to the nature of the material to be cut.
  • the released cut-away granular material is not left in the cavity between the machining tool and the surface of the cavity and influencing the quality of the result of the machining operation.
  • a mould form part formed in a block of sand for foundry operations is achieved where the dimensional quality of the cavity may be achieved.
  • the block of moulding material is provided in a fixture, which is pivotable in one or more directions.
  • the removal of the released granular material may be performed or at least facilitated by the gravity, since the fixture may be pivoted in such a way that the released granular material is removed by gravity from the area where the machining tool is engaged for the performance of the machining of the cavity.
  • the granular material may be completely removed from the cavity and the block of sand depending on the geometry of the cavity and the direction and amount of inclination of the fixture.
  • the machining tool is a rotary tool.
  • the rotary machining tool is preferably rotatable about an axis, which is inclinable relative to a horizontal position.
  • the machining is carried out by a robot. By mounting the machining tool on a robot, the degrees in the freedom of movement may be very high allowing for a high degree of flexibility in the installation and the method of producing a mould form element.
  • the cut-away material is removed substantially instantly by central suction means, such as a centrally disposed suction channel in the machining tool.
  • central suction means such as a centrally disposed suction channel in the machining tool.
  • the machining is preferably a milling operation, but could also be a drilling operation or any other material removing operation.
  • the machining tool or tools may be adapted to perform "under-cutting" operations.
  • the use of cores or the like may be avoided and/or the number of form parts for the mould may be reduced.
  • the method may be used for producing a set of form moulding parts for a moulding tool, such as a tool for injection moulding of plastic or aluminium objects, said method including machining at least one form part from a block of granular moulding material, such as sand including a binder, a cavity by using a machining tool, said machining tool being moved relative to the block of moulding material, said movements controlled by a geometric data from a computer control means to form the cavity; and removing the granular material removed from the block by the machining tool during the machining of the cavity, casting a form part for a moulding tool by pouring a melt, such as cast iron, aluminium, or other types of metals or alloys, into an assembly of form parts to produce a mould form part for a moulding tool.
  • a melt such as cast iron, aluminium, or other types of metals or alloys
  • the machining operation such as milling, grinding, polishing, electrical spark erosion, and/or similar surface treatment, involves a finishing surface treatment of the mould form part.
  • the machining involved in producing a moulding tool may be significantly reduced, as the only machining required may be reduced to a finishing treatment of the casting.
  • the method according to the previously mentioned aspects may further involve that the mould form part and a counter form part are assembled constituting a mould for a moulding tool, and then pouring a melted metal into the mould, allowing the melt to cool to form a metal casting, breaking the sand mould parts in order to expose the object for mould form part for the moulding tool for an injection moulding process.
  • the use of the method for producing at least one form part for an injection-moulding form for the pressure injection-moulding of objects in aluminium or similar light-weight metal wherein the form part is cast in a metal, such as cast iron, metal alloys or the like, and subsequently applied with a surface structure, said application involving machined to required surface dimensions.
  • the method of producing injection-moulding tools may also be advantageously used for providing injection-moulding tools for injection moulding of e.g. aluminium objects.
  • the method may be used for the production of a form for forming objects in a metal sheet, e.g. by a deep drawing operation pulling.
  • an inexpensive pressing tool may be provided making it possible to produce sheet formed objects in small quantities.
  • a method according to the invention may be used for producing a pattern board in a predetermined shape for use in a casting of an object.
  • an injection-moulding tool for the production of objects by injection moulding comprising at least one form part made by carrying out the method according the invention and used according to the above-mentioned aspects of the invention.
  • FIG 1 a schematic diagram of the operations according to a preferred embodiment of a method according to the invention is shown including a preferred utility of the method in a design and manufacturing process.
  • CAD Computer Aided Design
  • the result of this action of designing the object 2 is a computer representation of the object.
  • This electronic computer representation may then be forwarded to a CAM (CAM: Computer Aided Manufacturing) application, as referred to by 4, in which the mould, including the form parts for the casting of the form, is planned.
  • CAM Computer Aided Manufacturing
  • a machine control programme is created, e.g. a CNC (Computer Numeric Control) programme, as shown by the reference numeral 6 for the production of each of the form parts.
  • a block of granular moulding material preferably sand with a binder mixed into it, is prepared and provided in the machine centre.
  • the (first) CNC programme is fed to the control of a machining centre. This programme governs the machining of the predetermined cavity in a first block of sand 8.
  • a second form part may be produced by machining a second block of sand, as indicated by the reference numeral 10. Accordingly, further form parts may be produced.
  • the machining of the cavities may advantageously include inlet channels for the casting material.
  • the form parts i.e. the blocks of sand
  • the form parts are assembled. Then the operation of casting the object is carried out, as shown by 12.
  • This surface treatment could be a smoothening of the function surface or surfaces of each of the form parts.
  • the objects resulting from this process may be finished parts for use in a machine construction or any other kind of product.
  • the objects resulting from the process shown in fig. 1 are form parts for a moulding tool. These form parts are assembled as shown by the reference 16 to a form for casting a form part for moulding plastic or aluminium 18 or a form part for a deep-drawing or similar metal sheet manipulating process 20.
  • the form parts for the moulding of plastic or aluminium may be made of cast iron e.g. for injection moulding.
  • cast iron is meant all types of cast iron, including grey cast iron, and various alloys suitable for use in a casting process.
  • a block of sand 24 is provided on a fixture means comprising a base support 22 and fixture elements 26 retaining the block of sand 24 on the base support 22.
  • a cavity 29 is formed in the block of sand 24 by a machining tool 28, which is moveable relative to the block of sand in a plurality of directions, as indicated by the arrows on the figure 3.
  • the tool 28 may be provided with a central vacuum channel 30, which is connected, to a vacuum source 32 for removing the released granular material by suction during the machining operation.
  • the machining tool 28 may be a tool for drilling, milling or other material removal processes.
  • the milling tool 28 may be provided with various shapes, such as shown in fig. 4.
  • the milling tools 28, shown in fig. 4 are advantageous in that they are designed to perform cavities with "under-cuttings" in the block of sand 24.
  • the cutting edge 34 of the tool 28 is positioned on the perimeter of a cylindrical head section of the tool 28 with a diameter larger than the shaft of the tool 28.
  • a "hollow" cavity 29 may be formed in the sand block 24 with cavity rim regions 24a extending into the cavity 29.
  • fig. 4 (B) another example of an "undercutting" milling tool 28 is shown which is conical and where the cutting edges 36 on the conical portion of the tool 28.
  • the milling tools 28 shown in fig. 4 are also provided with a central suction channel 30 connected to a source of vacuum 32 for the removal of released material from the milling operation in order to avoid that the machining process is not obstruct by this released material.
  • the base support 22 is inclinably mounted on support fixture means 40.
  • the casting sand i.e. the sand with binder material has sufficient internal strength so that the block of sand does not break up if it is turned into different orientations.
  • this characteristic is used by the method of forming the cavity in the block of sand.
  • the block of sand may be inclined in one or more directions relative to horizontal during the machining operation.
  • the support base may even be turned upside down. This means that the released granular material of the sand block during the machining is transported away from the machining action by the gravity.
  • the machining tool 28 may be arranged on a robot 38 whereby complex cavity shapes may be achieved.
  • the support fixture means 40 may be a robotic or similar installation movable during the machining operation.
  • the robot 38 and/or the fixture 40 may be moved during the machining operation in order to achieve the desired shape of the cavity 29 in the sand block 24. These movements involve, as indicated by the arrows in figs. 5 and 6, relative movements between the machining tool 28 and the fixture including pivoting the machining tool 28 to an inclined orientation relative to the block of sand 24 in order to produce "under-cuttings".
  • the movements of the fixture 40 and the robot 38 handling the machining tool 28 may be controlled in a co-ordinated manner by the machine programme governing the machining operation.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
EP02075515A 2002-02-07 2002-02-07 Verfahren zum Herausarbeiten einer Giessform aus einem Sandblock und Verwendung des Verfahrens Withdrawn EP1334785A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP02075515A EP1334785A1 (de) 2002-02-07 2002-02-07 Verfahren zum Herausarbeiten einer Giessform aus einem Sandblock und Verwendung des Verfahrens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP02075515A EP1334785A1 (de) 2002-02-07 2002-02-07 Verfahren zum Herausarbeiten einer Giessform aus einem Sandblock und Verwendung des Verfahrens

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1749596A1 (de) * 2005-07-29 2007-02-07 ACTech GmbH Verfahren zur Herstellung einer Giessform aus einem Verbundformstoff für Giessereizwecke
CN102284730A (zh) * 2011-08-17 2011-12-21 机械科学研究总院先进制造技术研究中心 消失模数字化加工方法及其设备
CN102489675A (zh) * 2011-11-14 2012-06-13 机械科学研究总院先进制造技术研究中心 无模铸造成形机
CN102773420A (zh) * 2012-08-20 2012-11-14 机械科学研究总院先进制造技术研究中心 一种砂型的组合模具造型方法
CN101372135B (zh) * 2008-09-24 2012-11-21 机械科学研究总院先进制造技术研究中心 一种铸型数控加工的排砂方法及其装置
WO2013071479A1 (zh) * 2011-11-14 2013-05-23 机械科学研究总院先进制造技术研究中心 无模铸造成形机
WO2014101323A1 (zh) * 2012-12-31 2014-07-03 机械科学研究总院先进制造技术研究中心 一种大型数字化无模铸造成形机
CN104707937A (zh) * 2015-02-13 2015-06-17 佛山市峰华卓立制造技术有限公司 一种利用反向模具制备砂型的方法及砂型制备方法
CN112743049A (zh) * 2021-01-28 2021-05-04 第一拖拉机股份有限公司 一种适用于缸体砂型的快速改型方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1013661A (fr) * 1946-06-14 1952-08-01 Moules de fonderie en matériaux réfractaires
FR1138883A (fr) * 1954-11-12 1957-06-20 Procédé de fabrication de moules et modèles ou noyaux de fonderie, ainsi que produits obtenus
US4104347A (en) * 1974-11-19 1978-08-01 Kubota, Ltd. Method of making a sand mold
JPS5466326A (en) * 1977-11-07 1979-05-28 Mitsubishi Heavy Ind Ltd Molding of casting mold
JPS59166350A (ja) * 1983-03-11 1984-09-19 Mitsubishi Heavy Ind Ltd 鋳型造型装置
EP0317315A2 (de) * 1987-11-18 1989-05-24 D'sa Robert Verfahren zur Herstellung einer Giessform

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1013661A (fr) * 1946-06-14 1952-08-01 Moules de fonderie en matériaux réfractaires
FR1138883A (fr) * 1954-11-12 1957-06-20 Procédé de fabrication de moules et modèles ou noyaux de fonderie, ainsi que produits obtenus
US4104347A (en) * 1974-11-19 1978-08-01 Kubota, Ltd. Method of making a sand mold
JPS5466326A (en) * 1977-11-07 1979-05-28 Mitsubishi Heavy Ind Ltd Molding of casting mold
JPS59166350A (ja) * 1983-03-11 1984-09-19 Mitsubishi Heavy Ind Ltd 鋳型造型装置
EP0317315A2 (de) * 1987-11-18 1989-05-24 D'sa Robert Verfahren zur Herstellung einer Giessform

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section Ch Week 197927, Derwent World Patents Index; Class M22, AN 1979-50013B, XP002207000 *
PATENT ABSTRACTS OF JAPAN vol. 009, no. 018 (M - 353) 25 January 1985 (1985-01-25) *

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1749596A1 (de) * 2005-07-29 2007-02-07 ACTech GmbH Verfahren zur Herstellung einer Giessform aus einem Verbundformstoff für Giessereizwecke
CN101372135B (zh) * 2008-09-24 2012-11-21 机械科学研究总院先进制造技术研究中心 一种铸型数控加工的排砂方法及其装置
CN102284730A (zh) * 2011-08-17 2011-12-21 机械科学研究总院先进制造技术研究中心 消失模数字化加工方法及其设备
CN102284730B (zh) * 2011-08-17 2016-08-31 机械科学研究总院先进制造技术研究中心 消失模数字化加工方法及其设备
US9144838B2 (en) 2011-11-14 2015-09-29 Advanced Manufacture Technology Center, China Academy Of Machinery Science & Technology Forming machine without pattern casting
CN102489675A (zh) * 2011-11-14 2012-06-13 机械科学研究总院先进制造技术研究中心 无模铸造成形机
WO2013071479A1 (zh) * 2011-11-14 2013-05-23 机械科学研究总院先进制造技术研究中心 无模铸造成形机
JP2014533206A (ja) * 2011-11-14 2014-12-11 アドバンスド マニュファクチャー テクノロジー センター、チャイナアカデミー オブ マシーネリー サイエンス アンド テクノロジー 原型レス鋳造成形機
EP2781281A4 (de) * 2011-11-14 2015-12-02 Advanced Mft Tech Ct Cn Camst Gesenkfreies giessen und formmaschine
CN102773420A (zh) * 2012-08-20 2012-11-14 机械科学研究总院先进制造技术研究中心 一种砂型的组合模具造型方法
CN102773420B (zh) * 2012-08-20 2016-01-20 机械科学研究总院先进制造技术研究中心 一种砂型的组合模具造型方法
WO2014101323A1 (zh) * 2012-12-31 2014-07-03 机械科学研究总院先进制造技术研究中心 一种大型数字化无模铸造成形机
CN104707937A (zh) * 2015-02-13 2015-06-17 佛山市峰华卓立制造技术有限公司 一种利用反向模具制备砂型的方法及砂型制备方法
CN112743049A (zh) * 2021-01-28 2021-05-04 第一拖拉机股份有限公司 一种适用于缸体砂型的快速改型方法
CN112743049B (zh) * 2021-01-28 2022-08-26 第一拖拉机股份有限公司 一种适用于缸体砂型的快速改型方法

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