EP0253194A2 - Device for milling visible surfaces of workpieces - Google Patents

Device for milling visible surfaces of workpieces Download PDF

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Publication number
EP0253194A2
EP0253194A2 EP87109358A EP87109358A EP0253194A2 EP 0253194 A2 EP0253194 A2 EP 0253194A2 EP 87109358 A EP87109358 A EP 87109358A EP 87109358 A EP87109358 A EP 87109358A EP 0253194 A2 EP0253194 A2 EP 0253194A2
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EP
European Patent Office
Prior art keywords
milling
assigned
clamping
workpiece
plane
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.)
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Application number
EP87109358A
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German (de)
French (fr)
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EP0253194A3 (en
Inventor
Josef Eisenhut
Harri Schäfer
Dieter Michalk
Bernd Escher
Walter Hunger
Fritjof Heiland
Eckhardt Berger
Bernd Friedrich
Jörg Güldner
Manfred Bormann
Frank Leonhardt
Gerd Fickenwirth
Gotthard Müller
Bernd Härtel
Gerhard Simon
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VE Wohnungsbaukombinat "Wilhelm Pieck" Karl-Marx-Stadt
Original Assignee
VE Wohnungsbaukombinat "Wilhelm Pieck" Karl-Marx-Stadt
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Application filed by VE Wohnungsbaukombinat "Wilhelm Pieck" Karl-Marx-Stadt filed Critical VE Wohnungsbaukombinat "Wilhelm Pieck" Karl-Marx-Stadt
Publication of EP0253194A2 publication Critical patent/EP0253194A2/en
Publication of EP0253194A3 publication Critical patent/EP0253194A3/en
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/18—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by milling, e.g. channelling by means of milling tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D7/00—Accessories specially adapted for use with machines or devices of the preceding groups
    • B28D7/04—Accessories specially adapted for use with machines or devices of the preceding groups for supporting or holding work or conveying or discharging work

Definitions

  • the invention relates to a device for milling workpieces made of stone or stone-like material, in particular for face milling the step and riser surfaces of stairs in the automated surface processing of such workpieces made of stone or stone-like material, preferably in the industrial prefabrication of components.
  • a milling machine with a longitudinally, transversely and vertically movable milling support which carries a milling motor and in which a first milling spindle, which is driven by the motor shaft and is arranged axially parallel to it as well as a second milling spindle formed by extending the motor shaft.
  • the workpieces are placed on the workpiece carrier and clamped, so that continuous machining without empty cycles is not possible.
  • the milling tools are driven by a milling motor. This motor must be very large in order to transmit the forces required for surface processing such as the face milling of several surfaces.
  • a device for milling building blocks according to DE-OS 3 009 615 is also known.
  • This device is particularly suitable for face milling of two opposite sides of hollow blocks. It has a conveyor belt for the workpieces to be milled and an adjustable milling shaft with milling cutters attached to a frame above the conveyor belt.
  • This device is Although suitable for a continuous workpiece pass, it only enables the surface processing of opposite sides of workpieces, whereby a material-saving surface processing cannot be carried out, since the workpieces are placed and clamped on the conveyor belt with the unprocessed surfaces.
  • DE-OS 3 012 913 a template-controllable stone processing machine is described. It has a workpiece table, running rails arranged on rail foundations, a horizontal bridge that can be moved on it, a support that can be moved along the bridge and a tool delivery transport that can be moved vertically on it. With this machine it is not possible to influence the material removal because the workpieces are aligned with the unprocessed surface will. Since the workpieces have to be clamped individually, a continuous workpiece run is not possible.
  • DE-OS 3 219 883 describes a method for processing the visible surfaces of concrete slabs, in which there is even material removal on the visible side even with different slab thicknesses. Plates are brought up to the material-removing tool on the visible surface. The material is accepted from below. Even with this technical solution, it is not possible to machine several visible surfaces of a workpiece without idle cycles and changes in position in the clamping device.
  • the invention has for its object to provide a device for milling the visible surfaces of workpieces made of stone or stone-like material, which allows several different types of machining operations to be carried out at the same time, the workpiece return takes place continuously without empty return paths and the workpieces are fed to the tools so that a low material removal while maintaining a high surface quality and a general reduction in the processing effort takes place, the footprint of the device being kept small.
  • the workpiece holder has a plurality of pairs of clamping arms arranged diametrically about a common horizontal axis, preferably in duplicate, which are rotatably mounted together in cycles and are connected to a step-by-step mechanism, the clamping arm pairs being assigned clamping devices in each case.
  • the tool holder is designed as a milling bridge that is horizontally movable between two end points, on which in a first plane a step milling machine driven by the motor shaft of the milling motor assigned to it and in a second plane a riser milling machine driven by the motor shaft of the milling motor assigned to it and one via the motor shaft of the milling machine associated milling motor driven chamfer milling cutter are arranged.
  • the levels of the treadmill and the riser and chamfer milling machine are each assigned two adjacent pairs of clamping arms in such a manner that one clamping arm pair is arranged in the plane of the treadmill and the other clamping arm pair is arranged in the plane of the riser and chamfer milling machine.
  • a feed device is assigned to the workpiece holder, which ent entails the negative of the workpiece profile speaking trained receptacle, preferably forks.
  • the clamping devices assigned to the clamping arms consist of tension springs, preferably compression springs, which are connected to a tappet and a two-sided lever and are intermittently engaged with a working cylinder which generates a compressive force acting on the tappet.
  • a workpiece holder 1 and a tool holder are arranged in a base frame.
  • the workpiece holder 1 has a plurality of clamping arm pairs 2 arranged diametrically about a common horizontal axis.
  • the number of clamping arm pairs 2 corresponds to the number of work cycles of the device.
  • the clamping arm pairs 2 are rotatably mounted together in cycles and are connected to a stepping mechanism 3.
  • the clamping arm pairs 2 are also assigned clamping devices 5.
  • the tool holder is designed as a milling bridge 6 that is horizontally movable between two end points, on which a treadmill 8 driven by the motor shaft of the milling motor 7 assigned to it is driven in a second plane, and on the motor shaft of the milling bridge 6 assigned milling motor 7 driven riser 9 and a chamfer milling machine 10 driven in the same way are arranged.
  • the workpiece holder 1 and the milling bridge 6 are arranged with respect to one another in such a way that the tool plane of the treadmill 8 is assigned the workpiece plane of a workpiece held by a pair of clamping arms 2 and the workpiece plane of a further one held by an adjacent pair of clamping arms 2 the tool plane of the riser and chamfer milling machine 9; 10 are, while a third pair of clamping arms 2 is in the storage position and a fourth pair of clamping arms 2 is above the feed device 11.
  • the workpiece receptacle 1 is assigned a feed device 11 which has a receptacle 12 which is designed in a fork-shaped manner and corresponds to the negative of the step profile.
  • the clamping device 5 of the workpiece holder is designed in such a way that the compression springs 4 assigned to the clamping arm pairs 2 are connected to a plunger 13 and a two-sided lever 14 and are intermittently engaged with a working cylinder 15 which generates a pressure force acting on the plunger 13.
  • the steps to be processed are positioned above the feed device 11 by means of a pallet carriage.
  • the feed device 11 which for example consists of four hydraulic cylinders and forks 12 corresponding to the step profile, lifts a pair of steps between the pairs of clamping arms 2 of the workpiece holder 1 above the feed device 11, the stroke of the hydraulic cylinder between the two end positions being exactly limited and thus the pair of steps is aligned with each stroke with respect to the step and riser surface.
  • the one on the pestle 13 acting pressure force generating cylinder 15 actuated so that the compression springs 4 are biased via the two-sided lever 14.
  • the step is preloaded by releasing the pressure springs 4.
  • the treadmill machining (in the production direction at the rear) on the step pair located in the second clamping arm pair 2 is carried out in a third position Clamp arm pair 2 clamped step pair the riser and chamfer machining (above) and with the step pair clamped in the fourth position in the fourth clamp arm pair 2 (in the production direction at the front) the clamping arms are relaxed and this pair of steps is deposited for further processing.
  • the workpiece holder 1 is simultaneously locked by a hydraulic cylinder on the central star construction after the workpiece holder 1 has been rotated by the cycle time.
  • the workpiece holder 1 is unlocked and rotated by 90 ° in a further cycle, the processes described above taking place in the four positions.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Jigs For Machine Tools (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)

Abstract

The workpieces concerned are of stone or stone-like material. A work holder has a plurality of pairs of clamping arms arranged diametrically about a common horizontal axis, preferably in a dual configuration, which are mounted in such a way as to rotate together in a cycled manner and are in connection with a sequence processor, the pairs of clamping arms in each case being assigned clamping devices. The work holder is designed as a milling bridge which can move horizontally between two end points. The planes of the millers are assigned in a cycled manner in each case two neighbouring pairs of clamping arms. <IMAGE>

Description

Die Erfindung betrifft eine Vorrichtung zum Fräsen von Werkstücken aus Stein oder steinähnlichem Werkstoff, insbesondere zum Planfräsen der Tritt- und Setzstufen­flächen von Treppenstufen bei der automatisierten Oberflächenbearbeitung solcher Werkstücke aus Stein oder steinähnlichem Material, vorzugsweise in der in­dustriellen Vorfertigung von Bauelementen.The invention relates to a device for milling workpieces made of stone or stone-like material, in particular for face milling the step and riser surfaces of stairs in the automated surface processing of such workpieces made of stone or stone-like material, preferably in the industrial prefabrication of components.

Nach der DE-OS 3 319 893 ist eine Fräsmaschine mit einem gegen ein Maschinengestell längs, quer und in der Höhe verfahrbaren Frässupport bekannt, welcher einen Fräs­motor trägt und in dem eine erste Frässpindel, die von der Motorwelle angetrieben wird und zu ihr achsparallel angeordnet ist sowie eine zweite, durch Verlängerung der Motorwelle gebildete Frässpindel gelagert wird.According to DE-OS 3 319 893 a milling machine with a longitudinally, transversely and vertically movable milling support is known, which carries a milling motor and in which a first milling spindle, which is driven by the motor shaft and is arranged axially parallel to it as well as a second milling spindle formed by extending the motor shaft.

Bei dieser Fräsmaschine werden die Werkstücke auf den Werkstückträger aufgelegt und festgespannt, so daß eine kontinuierliche Bearbeitung ohne Leertakte nicht möglich ist. Desweiteren werden die Fräswerkzeuge von einem Fräs­motor angetrieben. Dieser Motor muß zur Übertragung der für eine Oberflächenbearbeitung wie das Planfräsen mehre­rer Flächen erforderlichen Kräfte sehr groß dimensioniert sein.In this milling machine, the workpieces are placed on the workpiece carrier and clamped, so that continuous machining without empty cycles is not possible. Furthermore, the milling tools are driven by a milling motor. This motor must be very large in order to transmit the forces required for surface processing such as the face milling of several surfaces.

Bekannt ist auch eine Vorrichtung zum Fräsen von Baustei­nen nach der DE-OS 3 009 615. Diese Vorrichtung ist ins­besondere geeignet zum Planfräsen von zwei sich gegen­überliegenden Seiten von Hohlblocksteinen. Sie weist ein Transportband für die zu fräsenden Werkstücke und eine an einem Gestell über dem Transportband befestigte verstell­bare Fräswelle mit Fräsern auf. Diese Vorrichtung ist zwar für einen kontinuierlichen Werkstückdurchlauf ge­eignet, sie ermöglicht aber nur die Oberflächenbearbei­tung sich gegenüberliegender Seiten von Werkstücken, wobei eine materialsparende Oberflächenbearbeitung nicht durchführbar ist, da die Werkstücke auf dem Transport­band mit den unbearbeiteten Flächen aufgelegt und ge­spannt werden.A device for milling building blocks according to DE-OS 3 009 615 is also known. This device is particularly suitable for face milling of two opposite sides of hollow blocks. It has a conveyor belt for the workpieces to be milled and an adjustable milling shaft with milling cutters attached to a frame above the conveyor belt. This device is Although suitable for a continuous workpiece pass, it only enables the surface processing of opposite sides of workpieces, whereby a material-saving surface processing cannot be carried out, since the workpieces are placed and clamped on the conveyor belt with the unprocessed surfaces.

In der DE-OS 3 012 913 wird eine schablonensteuerbare Steinbearbeitungsmaschine beschrieben. Sie weist einen Werkstücktisch, auf Schienenfundamenten angeordnete Laufschienen, eine darauf verfahrbare horizontale Brücke, einen längs der Brücke verfahrbaren Support und einen daran vertikal verfahrbaren Werkzeugzustelltransport auf, Mit dieser Maschine ist keine Beeinflussung des Material-­abtrages möglich, da die Werkstücke nach der unbearbei­teten Oberfläche ausgerichtet werden. Da die Werkstücke einzeln gespannt werden müssen, ist kein kontinuierlicher Werkstückdurchlauf möglich.In DE-OS 3 012 913 a template-controllable stone processing machine is described. It has a workpiece table, running rails arranged on rail foundations, a horizontal bridge that can be moved on it, a support that can be moved along the bridge and a tool delivery transport that can be moved vertically on it. With this machine it is not possible to influence the material removal because the workpieces are aligned with the unprocessed surface will. Since the workpieces have to be clamped individually, a continuous workpiece run is not possible.

Mit der Anordnung entsprechend der DE-OS 3 012 913 ist die Bearbeitung nur einer Fläche möglich, so daß die Werkstücke zur Bearbeitung weiterer Flächen stets umge­spannt werden müssen.With the arrangement according to DE-OS 3 012 913, machining is only possible on one surface, so that the workpieces must always be reclamped for machining further surfaces.

Ein Verfahren zur Bearbeitung der Sichtflächen von Beton­platten, bei dem auch bei unterschiedlichen Plattenstär­ken eine gleichmäßige Materialabnahme an der Sichtseite erfolgt, wird in der DE-OS 3 219 883 beschrieben. Hier­bei werden Platten auf der Sichtfläche aufliegend an das materialabnehmende Werkzeug herangeführt. Die Material-­abnahme erfolgt von unten. Auch mit dieser technischen Lösung ist eine Bearbeitung mehrerer Sichtflächen eines Werkstückes ohne Leertakte und Lageveränderungen in der Spanneinrichtung nicht realisierbar.DE-OS 3 219 883 describes a method for processing the visible surfaces of concrete slabs, in which there is even material removal on the visible side even with different slab thicknesses. Plates are brought up to the material-removing tool on the visible surface. The material is accepted from below. Even with this technical solution, it is not possible to machine several visible surfaces of a workpiece without idle cycles and changes in position in the clamping device.

Der Erfindung liegt die Aufgabe zugrunde, eine Vor­richtung zum Fräsen der Sichtflächen von Werkstücken aus Stein oder steinähnlichem Material zu schaffen, die es gestattet, mehrere verschiedenartige Bearbeitungsvor­gänge gleichzeitig vorzunehmen, wobei der Werkstückrück­lauf kontinuierlich ohne Leerrückwege erfolgt und die Werkstücke den Werkzeugen so zugeführt werden, daß ein geringer Materialabtrag bei Einhaltung einer hohen Oberflächenqualität sowie eine allgemeine Senkung des Bearbeitungsaufwandes erfolgt, wobei der Standflächen­bedarf der Vorrichtung klein gehalten ist.The invention has for its object to provide a device for milling the visible surfaces of workpieces made of stone or stone-like material, which allows several different types of machining operations to be carried out at the same time, the workpiece return takes place continuously without empty return paths and the workpieces are fed to the tools so that a low material removal while maintaining a high surface quality and a general reduction in the processing effort takes place, the footprint of the device being kept small.

Erfindungsgemäß wird diese Aufgabe dadurch gelöst, daß die Werkstückaufnahme mehrere diametral um eine gemein­same horizontale Achse angeordnete Klemmarmpaare, vor­zugsweise in doppelter Ausführung, aufweist, die gemein­sam taktweise drehbar gelagert sind und in Verbindung mit einem Schrittschaltwerk stehen, wobei den Klemmarm­paaren jeweils Spanneinrichtungen zugeordnet sind. Die Werkzeugaufnahme ist als zwischen zwei Endpunkten hori­zontal bewegliche Fräsbrücke ausgebildet, an der in einer ersten Ebene eine über die Motorwelle des ihr zugeordne­ten Fräsmotors angetriebene Trittstufenfräse und in einer zweiten Ebene eine über die Motorwelle des ihr zu­geordneten Fräsmotors angetriebene Setzstufenfräse und eine über die Motorwelle des ihr zugeordneten Fräsmotors angetriebene Fasenfräse angeordnet sind.According to the invention, this object is achieved in that the workpiece holder has a plurality of pairs of clamping arms arranged diametrically about a common horizontal axis, preferably in duplicate, which are rotatably mounted together in cycles and are connected to a step-by-step mechanism, the clamping arm pairs being assigned clamping devices in each case. The tool holder is designed as a milling bridge that is horizontally movable between two end points, on which in a first plane a step milling machine driven by the motor shaft of the milling motor assigned to it and in a second plane a riser milling machine driven by the motor shaft of the milling motor assigned to it and one via the motor shaft of the milling machine associated milling motor driven chamfer milling cutter are arranged.

Den Ebenen der Trittstufenfräse und der Setzstufen- und Fasenfräse sind jeweils zwei benachbarte Klemmarmpaare taktweise derart zugeordnet, daß ein Klemmarmpaar in der Ebene der Trittstufenfräse und das andere Klemmarmpaar in der Ebene der Setzstufen-und Fasenfräse angeordnet ist.The levels of the treadmill and the riser and chamfer milling machine are each assigned two adjacent pairs of clamping arms in such a manner that one clamping arm pair is arranged in the plane of the treadmill and the other clamping arm pair is arranged in the plane of the riser and chamfer milling machine.

Der Werkstückaufnahme ist eine Zuführeinrichtung zuge­ordnet, die eine dem Negativ des Werkstückprofils ent­ sprechend ausgebildete Aufnahme, vorzugsweise Gabeln, aufweist.A feed device is assigned to the workpiece holder, which ent entails the negative of the workpiece profile speaking trained receptacle, preferably forks.

Die den Klemmarmen zugeordneten Spanneinrichtungen be­stehen aus Spannfedern, vorzugsweise Druckfedern, welche mit einem Stößel und einem zweiseitigen Hebel verbunden sind und stehen taktweise mit einem, eine auf den Stößel wirkende Druckkraft erzeugenden Arbeitszylinder, im Eingriff.The clamping devices assigned to the clamping arms consist of tension springs, preferably compression springs, which are connected to a tappet and a two-sided lever and are intermittently engaged with a working cylinder which generates a compressive force acting on the tappet.

Die Erfindung soll nachstehend anhand eines Ausführungs­beispieles näher erläutert werden. Hierbei zeigen

  • Fig. 1: eine schematische Darstellung der Werk­stückaufnahme;
  • Fig. 2: eine schematische Darstellung der Vor­richtung in einer Seitenansicht.
The invention will be explained in more detail below using an exemplary embodiment. Show here
  • 1: a schematic representation of the workpiece holder;
  • Fig. 2: a schematic representation of the device in a side view.

In einem Grundgestell sind eine Werkstückaufnahme 1 und eine Werkzeugaufnahme angeordnet.A workpiece holder 1 and a tool holder are arranged in a base frame.

Die Werkstückaufnahme 1 weist mehrere diametral um eine gemeinsame horizontale Achse angeordnete Klemmarmpaare 2 auf. Die Anzahl der Klemmarmpaare 2 entspricht der Anzahl der Arbeitstakte der Vorrichtung. Die Klemmarmpaare 2 sind gemeinsam taktweise drehbar gelagert und stehen in Verbindung mit einem Schrittschaltwerk 3. Den Klemmarm­paaren 2 sind desweiteren Spanneinrichtungen 5 zugeordnet.The workpiece holder 1 has a plurality of clamping arm pairs 2 arranged diametrically about a common horizontal axis. The number of clamping arm pairs 2 corresponds to the number of work cycles of the device. The clamping arm pairs 2 are rotatably mounted together in cycles and are connected to a stepping mechanism 3. The clamping arm pairs 2 are also assigned clamping devices 5.

Die Werkzeugaufnahme ist als zwischen zwei Endpunkten horizontal bewegliche Fräsbrücke 6 ausgebildet, an der in einer ersten Ebene eine über die Motorwelle des ihr zugeordneten Fräsmotors 7 angetriebene Trittstufenfräse 8 in einer zweiten Ebene eine über die Motorwelle des ihr zugeordneten Fräsmotors 7 angetriebene Setzstufenfräse 9 und eine in gleicher Art und Weise angetriebene Fasen­fräse 10 angeordnet sind.The tool holder is designed as a milling bridge 6 that is horizontally movable between two end points, on which a treadmill 8 driven by the motor shaft of the milling motor 7 assigned to it is driven in a second plane, and on the motor shaft of the milling bridge 6 assigned milling motor 7 driven riser 9 and a chamfer milling machine 10 driven in the same way are arranged.

Die Werkstückaufnahme 1 und die Fräsbrücke 6 sind zuein­ander derart angeordnet, daß der Werkzeugebene der Tritt­stufenfräse 8 die Werkstückebene eines von einem Klemm­armpaar 2 gehaltenen Werkstückes und die Werkstückebene eines weiteren, von einem benachbarten Klemmarmpaar 2 gehaltenen der Werkzeugebene der Setzstufen- und Fasen­fräse 9;10 zugeordnet sind, während ein drittes Klemm­armpaar 2 in Ablagestellung und ein viertes Klemmarm­paar 2 über der Zuführeinrichtung 11 steht. Der Werk­stückaufnahme 1 ist eine Zuführeinrichtung 11 zugeordnet, die eine dem Negativ des Stufenprofils entsprechend aus­gebildete Aufnahme 12, die gabelförmig gestaltet ist, aufweist.The workpiece holder 1 and the milling bridge 6 are arranged with respect to one another in such a way that the tool plane of the treadmill 8 is assigned the workpiece plane of a workpiece held by a pair of clamping arms 2 and the workpiece plane of a further one held by an adjacent pair of clamping arms 2 the tool plane of the riser and chamfer milling machine 9; 10 are, while a third pair of clamping arms 2 is in the storage position and a fourth pair of clamping arms 2 is above the feed device 11. The workpiece receptacle 1 is assigned a feed device 11 which has a receptacle 12 which is designed in a fork-shaped manner and corresponds to the negative of the step profile.

Die Spanneinrichtung 5 der Werkstückaufnahme ist derart ausgebildet, daß die den Klemmarmpaaren 2 zugeordneten Druckfedern 4 mit einem Stößel 13 und einem zweiseitigen Hebel 14 verbunden sind und taktweise mit einem, eine auf den Stößel 13 wirkende Druckkraft erzeugenden Arbeits­zylinder 15 im Eingriff stehen.The clamping device 5 of the workpiece holder is designed in such a way that the compression springs 4 assigned to the clamping arm pairs 2 are connected to a plunger 13 and a two-sided lever 14 and are intermittently engaged with a working cylinder 15 which generates a pressure force acting on the plunger 13.

Mittels eines Palettenwagens werden die zu bearbeitenden Stufen über der Zuführeinrichtung 11 positioniert. Nach Stillstand des Palettenwagens hebt die Zuführeinrichtung 11, die beispielsweise aus vier Hydraulikzylindern und dem Stufenprofil entsprechenden Gabeln 12 besteht, ein Stufenpaar zwischen die über der Zuführeinrichtung 11 stehenden Klemmarmpaare 2 der Werkstückaufnahme 1, wobei der Hub der Hydraulikzylinder zwischen den beiden End­lagen genau begrenzt ist und somit das Stufenpaar bei jedem Hub bezüglich der Tritt- und Setzstufenfläche aus­gerichtet ist. Gleichzeitig wird der eine auf den Stößel 13 wirkende Druckkraft erzeugende Arbeitszylinder 15 betätigt, so daß über die zweiseitigen Hebel 14 die Druckfedern 4 vorgespannt werden. Nach Erreichen der oberen Endlage erfolgt die Stufenvorspannung durch Entspannen der Druckfedern 4.The steps to be processed are positioned above the feed device 11 by means of a pallet carriage. After the pallet truck has come to a standstill, the feed device 11, which for example consists of four hydraulic cylinders and forks 12 corresponding to the step profile, lifts a pair of steps between the pairs of clamping arms 2 of the workpiece holder 1 above the feed device 11, the stroke of the hydraulic cylinder between the two end positions being exactly limited and thus the pair of steps is aligned with each stroke with respect to the step and riser surface. At the same time, the one on the pestle 13 acting pressure force generating cylinder 15 actuated so that the compression springs 4 are biased via the two-sided lever 14. After reaching the upper end position, the step is preloaded by releasing the pressure springs 4.

Während das erste von vier Klemmarmpaaren 2 die vor­stehend beschriebene erste Stellung 1 einnimmt, erfolgt an dem in der zweiten Stellung befindlichen, in einem zweiten Klemmarmpaar 2 eingespannten Stufenpaar die Tritt­stufenbearbeitung (in Fertigungsrichtung hinten), an dem in der dritten Stellung befindlichen, in einem dritten Klemmarmpaar 2 eingespannten Stufenpaar die Setzstufen- und Fasenbearbeitung (oben) und bei dem in der vierten Stellung befindlichen, im vierten Klemmarmpaar 2 einge­spannten Stufenpaar (in Fertigungsrichtung vorn) erfolgt die Entspannung der Klemmarme und die Ablage dieses Stufenpaares zur weiteren Bearbeitung. In dieser Stellung erfolgt gleichzeitig nach der taktzeitgebundenen Drehung der Werkstückaufnahme 1 um 90° deren Verriegelung mit einem Hydraulikzylinder an der Mittelsternkonstruktion. Nach Beendigung des Fräsvorganges an den in der zweiten und dritten Stellung befindlichen Stufenpaaren wird die Werkstückaufnahme 1 entriegelt und in einem weiteren Takt um 90° gedreht, wobei die vorstehend beschriebenen Vorgänge in den vier Stellungen ablaufen.While the first of four clamping arm pairs 2 occupies the first position 1 described above, the treadmill machining (in the production direction at the rear) on the step pair located in the second clamping arm pair 2 is carried out in a third position Clamp arm pair 2 clamped step pair the riser and chamfer machining (above) and with the step pair clamped in the fourth position in the fourth clamp arm pair 2 (in the production direction at the front) the clamping arms are relaxed and this pair of steps is deposited for further processing. In this position, the workpiece holder 1 is simultaneously locked by a hydraulic cylinder on the central star construction after the workpiece holder 1 has been rotated by the cycle time. After completion of the milling process on the pairs of stages located in the second and third positions, the workpiece holder 1 is unlocked and rotated by 90 ° in a further cycle, the processes described above taking place in the four positions.

Claims (3)

1. Vorrichtung zum Fräsen der Sichtflächen von Werkstük­ken aus Stein oder steinähnlichem Werkstoff, ins­besondere zum Planfräsen der Tritt- und Setzstufen­flächen von Treppenstufen, bestehend aus einem Grund­gestell mit darin angeordneter Werkstück- und Werk­zeugaufnahme, dadurch gekennzeichnet, daß die Werk­stückaufnahme (1) mehrere diametral um eine gemeinsame horizontale Achse angeordnete Klemmarmpaare (2), vor­zugsweise in doppelter Ausführung, aufweist, die gemeinsam taktweise drehbar gelagert sind und in Verbindung mit einem Schrittschaltwerk (3) stehen, wobei den Klemmarmpaaren (2) jeweils Spanneinrichtungen (5) zugeordnet sind und die Werkzeugaufnahme als zwischen zwei Endpunkten horizontal bewegliche Fräs­brücke (6) ausgebildet ist, an der in einer ersten Ebene eine über die Motorwelle des ihr zugeordneten Fräsmotors (7) angetriebene Trittstufenfräse (8) und in einer zweiten Ebene eine über die Motorwelle des ihr zugeordneten Fräsmotors (7) angetriebene Setz­stufenfräse und eine über die Motorwelle des ihr zuge­ordneten Fräsmotors (7) angetriebene Fasenfräse (10) angeordnet sind und daß den Ebenen der Trittstufen­fräse (8) und der Setzstufenfräse (9) und Fasenfräse (10) jeweils zwei benachbarte Klemmarmpaare (2) taktweise derart zugeordnet sind, daß ein Klemmarm­paar (2) in der Ebene der Trittstufenfräse (8) und das andere in der Ebene der Setzstufen (9)- und Fasenfräse (10) angeordnet ist.1. Device for milling the visible surfaces of workpieces made of stone or stone-like material, in particular for face milling the step and riser surfaces of steps, consisting of a base frame with a workpiece and tool holder arranged therein, characterized in that the workpiece holder (1) several diametrically around a common horizontal axis arranged clamping arm pairs (2), preferably in duplicate, which are rotatably mounted together in cycles and are connected to a stepping mechanism (3), the clamping arm pairs (2) being assigned clamping devices (5) and the tool holder is designed as a horizontally movable milling bridge (6) between two end points, on which a treadmill (8) driven via the motor shaft of the milling motor (7) assigned to it in a first plane and a treadmill (8) driven via the motor shaft of the milling motor (7) assigned to it in a second plane ) driven riser and e a chamfer milling machine (10) driven via the motor shaft of the milling motor (7) assigned to it and that the levels of the treadmill (8) and the riser milling machine (9) and chamfer milling machine (10) are each assigned two adjacent pairs of clamping arms (2) in such a manner that that a pair of clamping arms (2) is arranged in the plane of the treadmill (8) and the other in the plane of the risers (9) and chamfering machine (10). 2. Vorrichtung nach Patentanspruch 1, dadurch gekenn­zeichnet, daß der Werkstückaufnahme (1) eine Zuführ­einrichtung (11) zugeordnet ist, die eine dem Negativ des Werkstückprofils entsprechend ausgebildete Auf­nahme, vorzugsweise Gabeln (12), aufweist.2. Device according to claim 1, characterized in that the workpiece holder (1) is assigned a feed device (11), one of the negative of the workpiece profile appropriately designed receptacle, preferably forks (12). 3. Vorrichtung nach Patentanspruch 1 oder 2, dadurch gekenn­zeichnet, daß die den Klemmarmpaaren (2) zugeordneten Spannvorrichtungen (5) aus Druckfedern (4) bestehen, die mit einem Stößel (13) und einem zweiseitigen Hebel (14) verbunden sind und taktweise mit einem, eine auf den Stößel (13) wirkende Druckkraft erzeu­genden Arbeitszylinder (15) im Eingriff stehen.3. Device according to claim 1 or 2, characterized in that the clamping arm pairs (2) associated clamping devices (5) consist of compression springs (4) which are connected to a plunger (13) and a two-sided lever (14) and intermittently with a working cylinder (15) generating a pressure force acting on the tappet (13) are in engagement.
EP87109358A 1986-07-10 1987-06-30 Device for milling visible surfaces of workpieces Withdrawn EP0253194A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DD292356 1986-07-10
DD29235686A DD250892B1 (en) 1986-07-10 1986-07-10 DEVICE FOR REMOVING SURFACES OF WORKPIECES

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EP0253194A2 true EP0253194A2 (en) 1988-01-20
EP0253194A3 EP0253194A3 (en) 1990-01-31

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1942538A1 (en) * 1969-08-21 1970-09-10 Schlageter Bayerische Maschf Universal stone milling and cutting machine
US3858369A (en) * 1972-10-18 1975-01-07 Valentin Mikhailovich Dolgov Machine for multiple grinding of semiconductor
FR2469259A1 (en) * 1979-08-08 1981-05-22 Radiotechnique Compelec Silicone waver prodn. system - combines cutting and grinding stages into single operation
DE3009615A1 (en) * 1980-03-13 1981-09-24 Siegfried 7971 Aichstetten Gebhart DEVICE FOR MILLING BLOCKS
FR2479736A1 (en) * 1980-04-02 1981-10-09 Steinbearbeitungs Maschinenfab Stone cutting machine with pattern control - has electric motor coupled to gantry to maintain contact between control curve and curve follower
DE3219883A1 (en) * 1982-05-27 1983-12-01 Horst 4150 Krefeld Sameith Process for machining the exposed surfaces of concrete slabs as well as device for carrying out this process
DE3319893A1 (en) * 1983-06-01 1984-12-06 Bernhard 6259 Brechen Eisenbach Milling machine

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1942538A1 (en) * 1969-08-21 1970-09-10 Schlageter Bayerische Maschf Universal stone milling and cutting machine
US3858369A (en) * 1972-10-18 1975-01-07 Valentin Mikhailovich Dolgov Machine for multiple grinding of semiconductor
FR2469259A1 (en) * 1979-08-08 1981-05-22 Radiotechnique Compelec Silicone waver prodn. system - combines cutting and grinding stages into single operation
DE3009615A1 (en) * 1980-03-13 1981-09-24 Siegfried 7971 Aichstetten Gebhart DEVICE FOR MILLING BLOCKS
FR2479736A1 (en) * 1980-04-02 1981-10-09 Steinbearbeitungs Maschinenfab Stone cutting machine with pattern control - has electric motor coupled to gantry to maintain contact between control curve and curve follower
DE3219883A1 (en) * 1982-05-27 1983-12-01 Horst 4150 Krefeld Sameith Process for machining the exposed surfaces of concrete slabs as well as device for carrying out this process
DE3319893A1 (en) * 1983-06-01 1984-12-06 Bernhard 6259 Brechen Eisenbach Milling machine

Also Published As

Publication number Publication date
DD250892B1 (en) 1988-12-14
DD250892A1 (en) 1987-10-28
EP0253194A3 (en) 1990-01-31

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