DE102011011550B3 - Clamping device for mounting workpiece on workpiece support of workpiece supporting body, comprises workpiece mount control part for sensory determination of contacting position and repeat mounting of workpiece on workpiece support - Google Patents

Abstract

The clamping device (5) comprises a workpiece mount control part for sensory determination of a contacting position and repeat mounting of a workpiece (6) on a workpiece support (1.1.7) of a workpiece supporting body (1). The workpiece supporting body has a stepped vertically adjustable spring acting upper part (1.1), which is supported under the workpiece. An axially guided pusher (1.1.2) is provided, which is accommodated in the upper part of a support element (1.1.1).

Description

The invention is based on the subject matter defined in the preamble of claim 1, wherein well-known knowledge is, in a qualitative machining industrial production of workpieces, the workpieces in clamping devices after a thorough cleaning and decaling positionally and repeatable on or hang up before they tight and secure. This requires a conscientiously performed and evaluated workpiece support control, which makes the use of sensory functional components with clear yes / no statement for the correct edition in mass production in a low-operator process required.

Known art is used for accurate position determination of workpieces during industrial manufacturing processes, sensors on holding devices. This is done, for example, as in DE 10 2005 008 095 A1 described as a simple contacting stylus, in DE 37 27312 A1 as a contacting sensor to indicate the workpiece position and in DE 10 2005 027 721 A1 as a distance sensor to be able to control the correct workpiece position in a cleaning device.

A disadvantage when using these simple structuring sensors is the design for simple contact detection without the workpiece speci fi cally recording the electrical conductivity of the workpiece material.

• • induktive Sensoren, die in ihrer Anwendung, beispielhaft aus DE 20 2009 002 164 U1 und DE 20 2008 002 735 U1 und
• • kapazitive/konduktive Positionsaufnehmer, die beispielhaft aus bekannt sind.

State of the art in the sensory support control of workpieces in clamping devices, in particular clamping devices for larger-sized workpieces joined from components of modular device systems or in clamping jaw systems are beyond

• • inductive sensors, in their application, exemplary DE 20 2009 002 164 U1 and DE 20 2008 002 735 U1 and
• • Capacitive / conductive position sensors, which are known by way of example from FIG.

• • die fehlende ja-/nein-Aussage durch fehlenden Tast-Kontakt des Werkstückes auf der Werkstückauflage des Werkstück-Stützkörpers bei unsachgemäß schräger Werkstücklage. Eine dadurch bedingte Messspaltbildung und -messung erfordert aufwändige Korrekturmaßnahmen zur Werkstücklage,
• • die spezifische Sensorstruktur bedingt eine große Dimensionierung, eine Stößelausbildung aus ferromagnetischen Werkstoff und die Bindung an eine relativ kurze Kabellänge sowie
• • eine geringere Eignung für flexible, werkstückkonturabhängige Anwendung und Anordnung auf Sondervorrichtungen, auch durch kompakt ausgebildete großdimensionierte Stützkörper und die nur punktuelle Anwendung auf Spann- und Auflagebacken von Maschinenschraubstöcken.

A disadvantage is the use of inductive sensors as functional components for a sensory workpiece support control in clamping devices:

• • The missing yes / no statement due to lack of tactile contact of the workpiece on the workpiece support of the workpiece support body with improperly inclined workpiece position. A resulting measurement gap formation and measurement requires complex corrective measures to the workpiece position,
• • The specific sensor structure requires a large dimensioning, a ram formation of ferromagnetic material and the bond to a relatively short cable length and
• • Less suitable for flexible, workpiece contour-dependent application and arrangement on special devices, even by compact trained large-sized support body and the only selective application to clamping and support jaws of machine vices.

• • die vorrangige Positions-, Anwesenheits- und Spannkraftfeststellung sowie die Störungsüberwachung gegenüber Verunreinigungen und Spänen an Werkstücken, wobei die Feststellung und Kontrolle der exakten Werkstück-Auflage nur indirekt mit erfolgt,
• • die Integration einer Vielzahl der erforderlichen Elektronikteile für diese komplexe und platzaufwendige Sensorstruktur und die relativ große Positionskörperdimensionierung sowie
• • eine aufwändig gestaltete Abdichtung der Positionskörper gegenüber Verunreinigungen und Spänen

A disadvantage of the use of capacitive / conductive position sensors for workpiece support control in clamping devices

• • The priority position, presence and clamping force detection and fault monitoring against contamination and chips on workpieces, with the determination and control of the exact workpiece support takes place only indirectly,
• • The integration of a large number of the required electronic components for this complex and space-consuming sensor structure and the relatively large position body dimensioning and
• • an elaborately designed sealing of the position bodies against contamination and swarf

• • unabhängig von der elektrischen Leitfähigkeit des Werkstück-Werkstoffes
• • mittels eines Werkstückkontaktes auf jedem der zur Spannvorrichtung gehörenden Werkstück-Stützkörper
• • die lage- und wiederholgenaue Lage jedes Werkstückes auf den Werkstück-Stützkörpern
• • als sofortige eindeutige ja-/nein-Aussage zur richtigen Auflage des Werkstückes realisierbar ist wobei
• • eine werkstückabhängige flexible Ausbildung und Anordnung insbesondere in Sonder-Spannvorrichtungen und
• • eine unaufwändige Ausbildung durch Vermeidung kurzer Kabellängen, spezifischer Stößelausbildungen realisierbar ist und
• • Sonderaufwendungen zur Isolierung gegenüber Schmutz- und Spänekontakten zwischen Werkstück und Werkstück-Stützkörpern während der Werdstück-Fertigung-Auflage-Auflagekontrolle und während der Werkstückspannung vermieden werden

The indicated in claim 1 invention is based on the problem, a sensory workpiece support control by means of workpiece support body in such a way that

• • independent of the electrical conductivity of the workpiece material
• • By means of a workpiece contact on each of the clamping device belonging workpiece support body
• • The positional and repeatable position of each workpiece on the workpiece support bodies
• • as an immediate unique yes / no statement on the correct support of the workpiece is feasible
• • a workpiece-dependent flexible design and arrangement, especially in special clamping devices and
• • an unobtrusive training by avoiding short cable lengths, specific ram training is feasible and
• • To avoid extra expense of insulation against dirt and chip contact between the workpiece and workpiece support bodies during fabrication-fabrication-overlay inspection and during workpiece clamping

It is an object of the invention to design clamping devices with a sonsorischen workpiece support control in and on the fixture belonging to fixed and movable workpiece support bodies so that an immediate unambiguous yes / no statement on the correct contacting support of the workpiece on all fixed and adjustable workpiece support bodies without additional measuring gap evaluations and corrections can be electronically determined and evaluated. The training of the required functional components should be small and unpretentious. The accumulation of dirt and chips at the contact points between the support element and retaining ring of the upper part and the resting workpiece should be avoided by a spatial overlap of the larger-sized workpiece and by a regular cleaning and decanting before input and edition of the workpiece in the jig.

The named problem and the above problem are solved by the subject-matter of claim 1 as follows:
The clamping devices, with which in particular prismatic and box-shaped workpieces are positioned and fixed for drilling and milling, are equipped with workpiece support bodies, each of which is a limit switch principle working inductive proximity sensor, the required energy as a DC flow with low voltage on a Electric cable is supplied. The workpiece support body consists of a stepped height adjustable and limited spring-moving under the workpiece supporting abutting upper part and arranged in the lower part sensor unit. The axially guided plunger, which is received in the resilient support element of the upper part and which is formed like a probe pin, forms a switching distance together with the sensor of the sensor unit. The sensor is in at least one insulated with insulating and bearing coatings guide sleeve against a sensor-receiving socket and the device body electrically isolated and recorded securely secured.

• • Ausbildungsvarianten des Halterungsringes für das Auflageelement und die
• • Ausbildung der gestuften Höhenpositionierung des Auflageelementes am Oberteil des Werkstück-Stützkörpers

Further embodiments of the invention are specified in the patent claims 2 and 3. They concern:

• • Training variants of the support ring for the support element and the
• • Training the stepped height positioning of the support element on the upper part of the workpiece support body

The invention is illustrated in one embodiment and in the figures and explained in more detail in the following part of the description:

1 . 2 and 3 : Front view illustrations of a workpiece support body in the middle section

4 a 3D view of a device body with different support formations of the workpiece support body

The in the 1 . 2 and 3 illustrated workpiece support body 1 consists in its basic structure of a shell 1.1 and a sensor unit 1.2 ,

• • zylindrische Scheibe in den 1, 2 und 4,
• • Vierkant-Körper,
• • Kegelstumpf-Vollkörper und
• • Kegelstumpf-Teilkörper, beide in der 4,

dargestellt.The top 1.1 consists of the designed as a push button spring support element 1.1.1 , which with his here spherically formed workpiece support 1.1.7 the workpiece 6 supported on the underside of the support ring 1.1.6 for the resilient support element 1.1.1 , the spring element 1.1.4 , the adaptive spacers 1.1.3 and from that, in the adaptive spacer 1.1.3 axially guided and in the support element 1.1.1 firmly held ram 1.1.2 as well as from the plunger terminal pins 1.1.5 , The top 1.1 is with its mentioned functional elements as a complete component by means of several retaining screws 1.1.8 on top of the tensioner 5 or a device body 5.1 attached. The retaining ring 1.1.6 for the support element 1.1.1 is in the training variants

• • cylindrical disc in the 1 . 2 and 4 .
• • square body,
• • truncated cone solid and
• • Truncated cone part body, both in the 4 .

shown.

• • ballige Auflagefläche, in den 1 und 2,
• • flache stirnseitige Auflagefläche,
• • geriffelte stirnseitige Auflagefläche und
• • eingeschraubter federnder Taststift 2

in der 4 dargestellt. Damit wird der Kontur und der Oberflächenart des jeweiligen Werkstückes 6, dessen Werkstückauflage auf Werkstück-Stützkörpern 1 kontrolliert wird, entsprochen.The workpiece support 1.1.7 the resilient support element 1.1.1 is in the variants

• • spherical bearing surface, in the 1 and 2 .
• • flat end-face support surface,
• • corrugated frontal support surface and
• • screwed in spring-loaded stylus 2

in the 4 shown. This is the contour and the surface of the respective workpiece 6 , whose workpiece support on workpiece support bodies 1 controlled, met.

The in the 1 . 2 and 4 as part of the shell 1.1 illustrated adaptive spacer 1.1.3 is interchangeable and allows by the respective workpiece-dependent thickness gauge as a passport and Justiermaß the graded height adjustability and adjustability of the support element 1.1.1 and thus the entire workpiece support body 1 in the tensioning device 5 ,

The lower part of the workpiece support body 1 is passed through in a hole or tapped hole of a plate of the tensioner 5 or in a device body 5.1 recorded sensor unit 1.2 educated. The sensor unit 2 consists of the sensor 1.2.2 , the sensor receptacle 1.2.3 with insulation and storage coating 1.2.6 opposite to those in the sensor receptacle 1.2.3 embedded guide sleeves 1.2.5 and from the adjusting spring 1.2.4 , In addition, the sensor unit 1.2 through a cap 4 Sealed and secured at the hole outlet. The top 1.1 and the sensor unit 1.2 are structured as an operating according to the limit switch principle inductive proximity sensor, wherein the means of the resilient support element 1.1.1 through an overhead workpiece 6 axially towards the sensor unit 1.2 Axially guided ram 1.1.2 with the sensor in its upper position 1.2.2 the sensor unit 1.2 a switching distance 1.2.1 realized at the front. The distance measure of the contactless switching distance 1.2.1 between the plunger 1.1.2 and the sensor 1.2.2 is how in 3 represented by means of an adjusting body 7 adjustable and adjustable. The required DC current with low voltage is via electric cables 3 used in cable feed and sealing air ducts 3.1 in a device body 5.1 the tensioning device 5 hidden are added, fed. The top 1.1 and the sensor unit 1.2 are thus conductively connected to the not shown in the figures power supply component and the electronic signal evaluation unit.

After removing the finished and milled workpieces 6 from the clamping device 5 are in the condition of non-support of workpieces 6 , on the workpiece supports 1.1.7 , the tops 1.1 and on the workpiece support body 1 in total, via the cable supply and sealing air channels 3.1 in the cavities between the device body as blast air supplied blown air 5.1 , Retaining ring 1.1.6 , Support element 1.1.1 and along the barrier air exit joints 3.2 carry out a dirt cleaning and removal of chips.

LIST OF REFERENCE NUMBERS

1

Workpiece support body

1.1

Upper part (from 1 )

1.1.1

(resilient) support element

1.1.2

Axially guided ram

1.1.3

adaptive spacer

1.1.4

spring element

1.1.5

Tappet clamp pins (for 1.1.2 )

1.1.6

Retaining ring (for 1.1.1 )

1.1.7

Workpiece support (on 1.1.1 )

1.1.8

retaining screws

1.2

sensor unit

1.2.1

(axial) switching distance

1.2.2

Sensor (inductive proximity sensor)

1.2.3

Sensor mounting bush

1.2.4

adjusting spring

1.2.5

Guide sleeves)

1.2.6

Insulation and storage coating

2

springy stylus

3

electric cable

3.1

Cable feed and sealing air channel

3.2

Sealing air outlet joints

4

cap

5

jig

5.1

device body

6

workpiece

7

Adjustment body (for sensor adjustment)

Claims (3)

Clamping devices ( 5 ) with workpiece support control for the sensory detection of a contact-bearing position and repeatable support of a workpiece ( 6 ) on workpiece supports ( 1.1.7 ) of workpiece support bodies ( 1 ) as a yes / no statement regardless of the electrical conductivity of the workpiece material characterized in that the workpiece support body ( 1 ) is an operating on the limit switch principle inductive proximity sensor, wherein a DC current with low voltage via electric cable ( 3 ) and that each workpiece supporting body ( 1 ) a stepped height adjustable and limited spring-moving under the workpiece ( 6 ) supporting fitting upper part ( 1.1 ), in whose trained as a stylus resilient support element ( 1.1.1 ) an axially guided ram ( 1.1.2 ), the front side with an axis-like, in the lower part of the workpiece support body ( 1 ) arranged existing movable sensor ( 1.2.2 ) a sensor unit ( 1.2 ) a switching distance ( 1.2.1 ), wherein the frontal distance measure between the two using an adjusting body ( 7 ) is adjustable and that the sensor ( 1.2.2 ) in at least one of insulating and storage coatings ( 1.2.6 ) sheathed guide sleeve ( 1.2.5 ), opposite a sensor receptacle ( 1.2.3 ) and the device body ( 5.1 ) is electrically isolated and secured in position firmly recorded. Clamping devices with workpiece support control according to claim 1, characterized in that a retaining ring ( 1.1.6 ) for the support element ( 1.1.1 ) optionally as a cylindrical disc, square, truncated cone or truncated pyramid, as a solid or partial body, is formed and that the position and repeatable height position of the support element ( 1.1.1 ) and the workpiece support ( 1.1.7 ) by means of at least one adaptive spacer ( 1.1.3 ) is height adjustable and adjustable. Clamping devices with workpiece support control according to claim 1 and 2, characterized in that in the device body ( 5.1 ) of the tensioning device ( 5 ) Cable feed and sealing air ducts ( 3.1 ) and recorded with the cavities in the sensor unit ( 1.2 ) and in the upper part ( 1.1 ) of the workpiece support body ( 1 ) and that when not resting the workpiece ( 6 ) on the workpiece support ( 1.1.7 ) and suspended Function of the sensor unit ( 1.2 ) with relaxed and removed workpiece ( 6 ) by means of into the cavities between device body ( 5.1 ), Retaining ring ( 1.1.6 ) and support element ( 1.1.1 ) Blowing air can be supplied and through sealing air outlet joints ( 3.2 ) is dissipatable.

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