DE4300627A1 - Clamping complex workpiece, e.g. exhaust manifold for machining - Google Patents

Clamping complex workpiece, e.g. exhaust manifold for machining

Info

Publication number
DE4300627A1
DE4300627A1 DE19934300627 DE4300627A DE4300627A1 DE 4300627 A1 DE4300627 A1 DE 4300627A1 DE 19934300627 DE19934300627 DE 19934300627 DE 4300627 A DE4300627 A DE 4300627A DE 4300627 A1 DE4300627 A1 DE 4300627A1
Authority
DE
Germany
Prior art keywords
workpiece
clamping
exhaust manifold
machining
molding
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
DE19934300627
Other languages
German (de)
Other versions
DE4300627C2 (en
Inventor
Hans Dr Ing Gropp
Werner Dr Ing Gesler
Horst Prof Dr Lichtenberg
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.)
INNOVATIVE FERTIGUNGSTECHNOLOG
Original Assignee
INNOVATIVE FERTIGUNGSTECHNOLOG
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 INNOVATIVE FERTIGUNGSTECHNOLOG filed Critical INNOVATIVE FERTIGUNGSTECHNOLOG
Priority to DE19934300627 priority Critical patent/DE4300627C2/en
Publication of DE4300627A1 publication Critical patent/DE4300627A1/en
Application granted granted Critical
Publication of DE4300627C2 publication Critical patent/DE4300627C2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25BTOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B11/00Work holders not covered by any preceding group in the subclass, e.g. magnetic work holders, vacuum work holders
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23QDETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q3/00Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
    • B23Q3/02Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
    • B23Q3/06Work-clamping means
    • B23Q3/08Work-clamping means other than mechanically-actuated

Abstract

The workpiece is partially embedded in a matrix of mouldable resin along with several holding elements such as studs. After the resin has hardened the workpiece is clamped at several points using the moulded in studs.The matrix and embedded workpiece are clamped on the worktable of e.g. an NC machine and the various machining operations completed. After machining the clamps on the moulded-in studs are released and the workpiece removed from the matrix.

Description

Die Erfindung betrifft ein Verfahren zum Spannen eines Guß- oder Schmiedestückes mit komplizierter räumlicher Kontur, beispielsweise eines Auspuffkrümmers, zur me­ chanischen Bearbeitung.The invention relates to a method for tensioning a Cast or forged piece with complicated spatial Contour, for example an exhaust manifold, to me chan editing.

Die mechanische Bearbeitun von Guß- und Schmiedestüc­ ken, wie z. B. das Fräsen und Bohren mit NC - Maschinen, ist trotz Verwendung von Universalspannmitteln, Bau­ kasten- und Spezialvorrichtungen kompliziert und aufwen­ dig. Derzeitig sind auch keine technischen Lösungen bekannt, die ein einfaches und kostengünstiges Spannen dieser Werkstücke für die Einzelfertigung ermöglichen. Bekannt ist lediglich durch DE-OS 30 49 359 ein Spann­ verfahren für Werkstücke, bei welchem das Werkstück ganz oder teilweise in einem thermisch erweichbaren speziellen Verbundwerkstoff eingebettet wird, der nach seiner Abkühlung auf Umgebungstemperaturen fest ist und somit die beim Bearbeiten des Werkstückes auftretenden Kräfte übertragen kann und anderseits beim Erstarrungs­ vorgang das Werkstück nicht oder nur unwesentlich ver­ formt. Der Temperaturausdehnungskoeffizient des Ver­ bundwerkstoffes soll durch Auswahl seiner Komponenten dem des jeweiligen Werkstückes anpaßbar sein. Erreicht wird dies beispielsweise durch die Verwendung eines Me­ talles, einer ferromagnetischen Komponente, eines niedrigschmelzenden Metalles und eines Wachses. Da der Verbundwerkstoff elektrisch leitfähig ist, kann er in­ duktiv erwärmt werden. Das Spannen des Werkstückes er­ folgt in der Weise, in dem das Werkstück oder Teile des Werkstückes in eine oder mehrere Mulden einer Palette gelegt werden, wobei der jeweilige Verbundwerkstoff schon in den Mulden ist. Nach dem Abkühlen des Verbund­ werkstoffes auf Umgebungstemperaturen soll das Werk­ stück gespannt sein. Das Spannen von Werkstücken mit komplizierten räumlichen Konturen ist schwierig, da zu­ sätzlich Hilfsmittel zur Lagesicherung des Werkstückes notwendig sind, um somit eine mechanische Bearbeitung an bestimmten Stellen des Werkstückes zu ermöglichen. Die Nachteile des Spannverfahrens sind weiterhin in der Verwendung eines speziellen, gesondert herzustellenden Verbundwerkstoffes und in seiner induktiven Erwärmung zu sehen.The mechanical processing of castings and forgings ken, such as B. milling and drilling with NC machines, is despite the use of universal clamping devices, construction box and special devices complicated and expensive dig. There are currently no technical solutions known, the simple and inexpensive clamping enable these workpieces for one-off production. Only one tension is known from DE-OS 30 49 359 process for workpieces in which the workpiece fully or partially in a thermally softenable special composite material is embedded, which according to its cooling to ambient temperatures is solid and thus those that occur when machining the workpiece Can transfer forces and on the other hand during solidification operation does not ver or only insignificantly ver forms. The coefficient of thermal expansion of the ver bundwerkstoffes should be by selecting its components be adaptable to that of the respective workpiece. Reached this is done, for example, by using a me talles, a ferromagnetic component, one low melting metal and a wax. Since the Composite material is electrically conductive, it can in be heated ductively. Clamping the workpiece follows in the manner in which the workpiece or parts of the Workpiece in one or more troughs of a pallet be placed, the respective composite material is already in the hollows. After the composite has cooled The material should be at ambient temperatures be excited. Clamping workpieces with  complicated spatial contours is difficult because of that additional tools to secure the position of the workpiece are necessary for mechanical processing to enable at certain points on the workpiece. The disadvantages of the tensioning process are still in the Use of a special, to be manufactured separately Composite and in its inductive heating to see.

Daher besteht die Aufgabe der Erfindung in der Entwick­ lung eines Verfahrens zum Spannen eines Guß- oder Schmiedestückes mit komplizierter räumlicher Kontur zur mechanischen Bearbeitung, welches einfach und mit ge­ ringem Aufwand zu realisieren ist und ohne zusätzliche Hilfsmittel das Werkstück in der für die Bearbeitung notwendigen Lage sicher hält.Therefore, the object of the invention is to develop development of a method for clamping a casting or Forgings with a complicated spatial contour for mechanical processing, which is simple and with ge can be realized with little effort and without additional Aids the workpiece in the for machining necessary location holds securely.

Erfindungsgemäß wird dies dadurch erreicht, daß das zu bearbeitende Werkstück und ein oder mehrere Aufnahmeelemente für Werkstückspan­ ner in einen in eine Form gegossenen aushärtbaren Form­ stoff lagebestimmt gedrückt werden, das Werkstück nach dem Aushärten des Formstoffes gespannt, mechanisch be­ arbeitet und danach der Form entnommen wird. Kennzeich­ nend ist ebenfalls für das Verfahren, daß der Formstoff ein gießbares, reaktionsharzgebundenes Material ist. Vorteilhafterweise können Werkstücke mit komplizierten räumlichen Konturen mit geringem Aufwand mechanisch be­ arbeitet werden, da das Spannverfahren ein einfaches Spannen derartiger Werkstücke ermöglicht und der ver­ wendete Formstoff billig ist. Das gespannte und zu be­ arbeitende Werkstück hat durch die partielle Formstoff­ umhüllung eine gute Lagesicherung. Dadurch sind auch gute Zerspanungsbedingungen gegeben. Das erfindungsge­ mäße Spannverfahren ist wirtschaftlich im Musterbau und bei der Einzelfertigung von Werkstücken anwendbar. Weitere vorteilhafte Anwendungsmöglichkeiten werden bei der Realisierung von Fügeprozessen und Montagearbeiten gesehen.According to the invention this is thereby achieved that the workpiece to be machined and one or more receiving elements for workpiece chips ner in a curable mold cast in a mold position, the workpiece is pressed the hardening of the molding material, mechanically works and is then removed from the form. Indicator nend is also for the process that the molding material is a castable, reactive resin bonded material. Advantageously, workpieces with complicated mechanically be spatial contours with little effort work because the clamping process is a simple one Allows clamping of such workpieces and the ver applied molding material is cheap. The tense and be working workpiece has through the partial molding material wrapping a good position securing. This also means good machining conditions. The fiction moderate clamping process is economical in prototyping and applicable for the individual production of workpieces. Other advantageous applications are at the implementation of joining processes and assembly work  seen.

Die Erfindung soll am Beispiel des Spannens eines Aus­ puffkrümmers mit fünf zu bearbeitenden Flanschen näher erläutert werden.The invention is based on the example of clamping an off puff elbow with five flanges to be machined closer are explained.

Hierzu ist es notwendig, daß eine der Größe des Auspuff­ krümmers entsprechende Form mit einem reaktionsharzge­ bundenen Material, beispielsweise MAPULIT, gefüllt wird. Danach kann der Auspuffkrümmer lagebestimmt in den Form­ stoff eingedrückt werden. Dies bedeutet, daß die Flanschflächen etwa vertikal (± 1 Grad) ausgerichtet sind. Gleichzeitig werden drei Gewindestifte für Spann­ eisen in den Formstoff an den Stellen eingedrückt die die Spannkräfte zur Wirkung bringen. Der Formstoff här­ tet in kurzer Zelt aus, so daß die Spanneisen montiert und das Werkstück gespannt werden kann. Nach dem Aus­ richten und Spannen der Form auf dem Arbeitstisch einer NC-Maschine werden die fünf Flansche des Auspuffkrüm­ mers plangefräst, die Bohrungen für die Befestigungs­ schrauben hergestellt und der bearbeitete Auspuffkrüm­ mer nach dem Lösen der Spanneisen der Form entnommen.For this it is necessary that one of the size of the exhaust Krümmers corresponding shape with a reactive resin bound material, such as MAPULIT, is filled. After that, the exhaust manifold can be positioned in the shape be pressed in. This means that the Flange surfaces aligned approximately vertically (± 1 degree) are. At the same time, three setscrews for clamping iron pressed into the molding material at the points bring the tension forces to bear. The molding material hard tet in a short tent, so that the tensioning iron is mounted and the workpiece can be clamped. After the end straighten and clamp the shape on the work table one NC machine will be the five flanges of the exhaust manifold mers face milled, the holes for the attachment screws and the machined exhaust manifold removed from the mold after loosening the clamping arms.

Claims (2)

1. Verfahren zum Spannen eines Guß- oder Schmiedestüc­ kes mit komplizierter räumlicher Kontur, beispielswei­ se eines Auspuffkrümmers, zur mechanischen Bearbeitung, bei dem ein Werkstück ganz oder teilweise in einem ther­ misch erweichbaren Verbundwerkstoff eingebettet wird, dadurch gekennzeichnet, daß
  • - das zu bearbeitende Werkstück und ein oder mehrere Aufnahmeelemente für Werkstückspanner, wie beispiels­ weise Gewindestifte, in einen in eine Form gegossenen aushärtbaren Formstoff lagebestimmt gedrückt werden,
  • - das Werkstück nach dem Aushärten des Formstoffes ge­ spannt und mechanisch bearbeitet wird, sowie ab­ schließend
  • - das bearbeitete Werkstück der Form entnommen wird.
1. A method for clamping a Guß- or Schmiedestüc kes with a complicated spatial contour, for example se an exhaust manifold, for mechanical processing, in which a workpiece is completely or partially embedded in a thermally softenable composite material, characterized in that
  • the workpiece to be machined and one or more receiving elements for workpiece clamps, such as set screws, for example, are pressed into a position-hardened molding material cast in a mold,
  • - After the hardening of the molding material, the workpiece is clamped and mechanically processed, and finally
  • - The machined workpiece is removed from the mold.
2. Verfahren nach Anspruch 1, dadurch ge­ kennzeichnet, daß der Formstoff ein gieß­ bares, reaktionsharzgebundenes Material ist.2. The method according to claim 1, characterized ge indicates that the molding material is poured hard, reactive resin-bound material.
DE19934300627 1993-01-13 1993-01-13 Process for clamping a casting or forging Expired - Fee Related DE4300627C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19934300627 DE4300627C2 (en) 1993-01-13 1993-01-13 Process for clamping a casting or forging

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19934300627 DE4300627C2 (en) 1993-01-13 1993-01-13 Process for clamping a casting or forging

Publications (2)

Publication Number Publication Date
DE4300627A1 true DE4300627A1 (en) 1994-07-14
DE4300627C2 DE4300627C2 (en) 1995-11-16

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DE19934300627 Expired - Fee Related DE4300627C2 (en) 1993-01-13 1993-01-13 Process for clamping a casting or forging

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DE (1) DE4300627C2 (en)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4339069A1 (en) * 1993-11-16 1995-05-18 Innovative Fertigungstechnolog Chuck for massive workpieces, e.g. mining machine wedge shoe
US6993839B2 (en) * 2002-07-15 2006-02-07 Omni Integrated Technologies, Inc. Method for machining a stainless steel exhaust manifold for a multi-cylinder combustion engine
WO2007082504A1 (en) * 2006-01-19 2007-07-26 Mtu Aero Engines Gmbh Method for the milling machining of components
CN103252660A (en) * 2013-05-19 2013-08-21 河南省西峡汽车水泵股份有限公司 Exhaust manifold pressurization flange connecting hole locating device and hole drilling locating method
CN106217072A (en) * 2016-08-25 2016-12-14 河南飞龙(芜湖)汽车零部件有限公司 A kind of big fixture for processing of exhaust manifold
CN106271731A (en) * 2016-08-25 2017-01-04 河南飞龙(芜湖)汽车零部件有限公司 One is used for processing exhaust manifold side boss fixture
CN106271760A (en) * 2016-08-27 2017-01-04 河南飞龙(芜湖)汽车零部件有限公司 A kind of exhaust manifold little flange fixture for processing after kerf
CN106425538A (en) * 2016-08-25 2017-02-22 河南飞龙(芜湖)汽车零部件有限公司 Small flange clamp for machining exhaust manifold
CN105127476B (en) * 2015-09-24 2017-05-17 北京科诚中业汽车零部件制造有限公司 Vehicle exhaust manifold small head end drilling device
CN110238686A (en) * 2019-06-21 2019-09-17 钟建斌 Turnover fixture is used in a kind of processing of inlet manifold
CN110405659A (en) * 2019-07-18 2019-11-05 张�浩 A kind of frock clamp for the processing of intake manifold flange face
DE102019124146A1 (en) * 2019-09-09 2021-03-11 Technische Universität Darmstadt Process for reworking components

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004027605B4 (en) * 2004-06-05 2006-07-06 Innovative Fertigungstechnologie Gmbh (Ift) Tensioning device for machine tools comprises a body consisting of several hybrid wall parts adhered at the connecting joints
DE102008051741B4 (en) * 2008-10-15 2017-05-04 Festo Ag & Co. Kg Clamping jaw, clamping device and clamping method by phase transition of a latent heat storage material
CN104440180A (en) * 2014-11-28 2015-03-25 重庆三贵机械制造有限公司 Clamp for machining of engine intake manifold
CN105108531A (en) * 2015-09-24 2015-12-02 重庆民发汽车配件有限责任公司 Exhaust manifold sensor installation hole chamfering tool
CN106271709A (en) * 2016-08-25 2017-01-04 河南飞龙(芜湖)汽车零部件有限公司 One is used for processing big fixture of exhaust manifold
CN106271732A (en) * 2016-08-25 2017-01-04 河南飞龙(芜湖)汽车零部件有限公司 A kind of exhaust manifold little flange face fixture for processing

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1602466B (en) * Hexcel Corp., Dublin, Calif. (V.StA.) Holding device for a honeycomb-like structure
DE3049359A1 (en) * 1980-12-29 1982-07-29 Artur Prof. Dipl.-Ing. 7923 Königsbronn Jung Workpiece holder using low melting point composition - uses modular block with compartments for composition containing metallic inclusions for heating
GB2186510A (en) * 1986-02-13 1987-08-19 United Technologies Corp A workholder and method for securing a workpiece thereto
DE3634268A1 (en) * 1986-10-08 1988-04-21 Hauni Werke Koerber & Co Kg WORKPIECE CLAMPING DEVICE
DE4137981A1 (en) * 1991-11-19 1993-05-27 Magdeburg Werkzeugmasch Workpiece fixture construction system - involves cementing together block elements cast in desired shapes from resin bonded mineral concrete

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1602466B (en) * Hexcel Corp., Dublin, Calif. (V.StA.) Holding device for a honeycomb-like structure
DE3049359A1 (en) * 1980-12-29 1982-07-29 Artur Prof. Dipl.-Ing. 7923 Königsbronn Jung Workpiece holder using low melting point composition - uses modular block with compartments for composition containing metallic inclusions for heating
GB2186510A (en) * 1986-02-13 1987-08-19 United Technologies Corp A workholder and method for securing a workpiece thereto
DE3634268A1 (en) * 1986-10-08 1988-04-21 Hauni Werke Koerber & Co Kg WORKPIECE CLAMPING DEVICE
DE4137981A1 (en) * 1991-11-19 1993-05-27 Magdeburg Werkzeugmasch Workpiece fixture construction system - involves cementing together block elements cast in desired shapes from resin bonded mineral concrete

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19504916A1 (en) * 1993-11-16 1996-08-22 Innovative Fertigungstechnolog Fixture arrangement for use with machine tools
DE19504916C2 (en) * 1993-11-16 2002-08-29 Innovative Fertigungstechnolog Attachment jig
DE4339069A1 (en) * 1993-11-16 1995-05-18 Innovative Fertigungstechnolog Chuck for massive workpieces, e.g. mining machine wedge shoe
US6993839B2 (en) * 2002-07-15 2006-02-07 Omni Integrated Technologies, Inc. Method for machining a stainless steel exhaust manifold for a multi-cylinder combustion engine
US8635772B2 (en) 2006-01-19 2014-01-28 Mtu Aero Engines Gmbh Method of damping vibrations during a machining operation
WO2007082504A1 (en) * 2006-01-19 2007-07-26 Mtu Aero Engines Gmbh Method for the milling machining of components
CN103252660A (en) * 2013-05-19 2013-08-21 河南省西峡汽车水泵股份有限公司 Exhaust manifold pressurization flange connecting hole locating device and hole drilling locating method
CN103252660B (en) * 2013-05-19 2016-07-06 河南省西峡汽车水泵股份有限公司 Exhaust manifold supercharging flange connecting hole positioner and drilling and positioning method
CN105127476B (en) * 2015-09-24 2017-05-17 北京科诚中业汽车零部件制造有限公司 Vehicle exhaust manifold small head end drilling device
CN106425538A (en) * 2016-08-25 2017-02-22 河南飞龙(芜湖)汽车零部件有限公司 Small flange clamp for machining exhaust manifold
CN106217072A (en) * 2016-08-25 2016-12-14 河南飞龙(芜湖)汽车零部件有限公司 A kind of big fixture for processing of exhaust manifold
CN106271731A (en) * 2016-08-25 2017-01-04 河南飞龙(芜湖)汽车零部件有限公司 One is used for processing exhaust manifold side boss fixture
CN106271760A (en) * 2016-08-27 2017-01-04 河南飞龙(芜湖)汽车零部件有限公司 A kind of exhaust manifold little flange fixture for processing after kerf
CN110238686A (en) * 2019-06-21 2019-09-17 钟建斌 Turnover fixture is used in a kind of processing of inlet manifold
CN110238686B (en) * 2019-06-21 2020-06-02 浙江博弈科技股份有限公司 Overturning clamp for machining intake manifold
CN110405659A (en) * 2019-07-18 2019-11-05 张�浩 A kind of frock clamp for the processing of intake manifold flange face
CN110405659B (en) * 2019-07-18 2020-12-18 张�浩 A frock clamp for intake manifold flange face processing
DE102019124146A1 (en) * 2019-09-09 2021-03-11 Technische Universität Darmstadt Process for reworking components

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