DE102017117037A1 - fixing - Google Patents

Abstract

The invention relates to a fixing device for positionally accurate fixing of workpieces to be machined (2) comprising: - a workpiece holder (3) having at least a first, radially outward workpiece-holding element (3.1), which is ring-like, enclosing the workpiece (2) on the circumferential side and in which the workpiece (2) is fixable in a workpiece-clamping inner region (3a); and - a frame holder (4) having a receiving portion (4a) for clamping the workpiece holder (3); wherein the first workpiece-clamping element (3.1) is constructed symmetrically with respect to a transverse plane (QE) perpendicular to the workpiece-mounting center axis (WMA), in such a way that the workpiece holder (3) in a first installation position and in a first mounting position (3.1) for the first installation position about a in the transverse plane (QE) extending transverse axis (QA) by 180 ° rotated, second mounting position in the socket holder (4) can be clamped.

Description

The invention relates to a fixing device for workpieces to be machined, for example optical lenses, in order to be able to grind or polish them.

Fixing devices for clamping optical workpieces are already known in the prior art. These are used to hold an optical workpiece within a processing machine, by means of which the optical workpiece is mechanically processed, for example. The mechanical processing may be, for example, a grinding process or a polishing process. Optical workpieces often have to be fixed several times in order to carry out different process steps on them. Thus, an optical lens often needs to be machined on the two opposite sides to achieve the desired optical properties. The problem with this is that production inaccuracies arise due to the multiple clamping of the optical workpiece, which can impair the optical properties of the workpiece.

The patent DE 101 39 805 C1 discloses a lens frame. The lens frame includes a plurality of supporting elements which engage in a groove provided circumferentially in the lens to fix the lens in the socket ring.

The European patent application EP 2 163 345 A1 discloses a clamping system with a frame and a clamping device. The clamping device is rotatably mounted on the frame.

Proceeding from this, it is an object of the invention to provide a fixing device, in particular a lens or lens blank fixing device, which allows high precision manufacturing of optical workpieces due to a high accuracy of change.

The object is solved by the features of independent claim 1. Preferred embodiments are subject of the dependent claims. A method for fixing optical workpieces to be processed is the subject of the independent patent claim 19.

According to a first aspect, the invention relates to a fixing device for positionally accurate fixing of workpieces to be machined, which may be optical workpieces in particular. The fixing device comprises a workpiece holder, which has at least one first, radially outer workpiece-holding element. The workpiece holder is ring-shaped, enclosing the workpiece on the circumferential side, so that the workpiece can be fixed in a workpiece-clamping inner region.

The fixing device further comprises a holder holder, which has a receiving area for clamping the workpiece holder. The first workpiece-holding element is constructed symmetrically with respect to a transverse plane extending perpendicular to the workpiece-holder central axis, which is in particular a central transverse plane of the first workpiece-holding element, in such a way that the workpiece holder is mounted over the first workpiece-holding element in a first installation position and in the first installation position about an in-line position the transverse plane extending transverse axis rotated by 180 °, the second mounting position can be clamped in the socket holder.

The essential advantage of the fixing device according to the invention is that the workpiece, after it has been fixed in the workpiece holder, can remain in this workpiece holder until all processing steps (for example grinding, polishing, etc.) have been performed on the workpiece. Due to the symmetrical design of the first workpiece-holding element, the workpiece holder can be fixed in the mounting holder in two different installation positions, in which the workpiece can be processed on the opposite surface sides. As a result, a high repetition and change accuracy and thus an improved machining accuracy of the workpiece can be achieved.

According to one embodiment, the first workpiece-clamping element has on the circumference conical surfaces, in particular ring-like conical surfaces, arranged on opposite sides with respect to the transverse plane. In other words, with a horizontal alignment of the transverse plane, a first conical surface is on the upper side and a second conical surface is on the underside of the transverse plane. Through these conical surfaces, one of which, depending on the installation position, preferably corresponds with at least one inwardly formed conical surface of the holder holder, a highly accurate centered introduction of the workpiece holder into the holder holder is achieved.

According to an exemplary embodiment, the conical surfaces of the first workpiece-clamping element are designed in opposite directions, such that the circumference of the first workpiece-clamping element decreases toward the upper and lower side surfaces of the first workpiece-clamping element. In other words, the first workpiece-holding element is configured to be double-conical, with the conical surfaces tapering such that the diameter of the first workpiece-holding element is measured from one in the region of the transverse plane reduced first diameter to a measured in the region of the side surface second diameter.

According to one embodiment, the conical surfaces of the first workpiece-holding element are ring-like or ring-segment-like. As a result, a highly accurate centering of the workpiece holder in the holder holder can be achieved, in each of the two mounting positions such that the workpiece is aligned exactly centered with respect to a reference position.

According to one embodiment, the receiving region of the holder holder on the inner peripheral side on at least one ring-like or ring segment-like cone surface. The conical surface may for example be formed as a continuous ring or formed by a plurality of circumferentially distributed arranged cone ring segments. Depending on the installation position, this conical surface acts in each case with one of the conical surfaces provided on the outside circumference of the workpiece holder, thereby achieving a highly accurate, centered reception of the workpiece holder in the holder holder.

According to one exemplary embodiment, the first workpiece-holding element has on its circumference, in particular on the outer peripheral side, a continuous circumferential groove or circumferentially, in particular on the outer peripheral side, distributed groove segments. In this groove or groove segments clamping means can engage to fix the workpiece holder within the socket holder. In particular, the clamping means can be designed to interlock positively in the groove or the groove segments. In particular, a pressure directed towards the bearing surface or the interface, which is intended for connection to a processing machine, can be exerted on the workpiece holder by the clamping means, so that the workpiece holder is pressed onto contact surfaces provided for plan positioning of the workpiece holder.

According to one exemplary embodiment, the first workpiece-holding element has at least one groove, at least one notch and / or at least one protrusion protruding from the side face, which has at least one corresponding projection, at least one groove or at least one notch in the first and second side faces Receptacle of the socket holder form-fitting cooperate. In particular, a positive connection between the workpiece holder and the holder holder is achieved by the cooperating grooves, notches or projecting from the side surfaces of projections to bring the workpiece holder together with the workpiece held in a defined rotational position in the socket holder. In order to ensure a clear rotational position in which the workpiece holder is introduced into the holder holder, the projections, grooves or indentations may be arranged such that the workpiece holder can be introduced only in exactly one single rotational position in the holder holder. This can be done in particular by a kind of local or spatial coding of the projections, grooves or indentations. The projections, grooves or indentations on the two opposite side surfaces of the workpiece holder are provided such that regardless of the installation position of the workpiece holder, the workpiece is always in the same rotational position in the holder holder can be introduced.

According to one exemplary embodiment, the workpiece holder is designed to receive a workpiece connecting piece enclosing the workpiece on the circumference. This workpiece connecting piece can be materially connected, for example by an adhesive bond, with the workpiece. Alternatively, it is possible to form-fit and / or force-fit the connection between the workpiece and the workpiece connector, for example by shrinking a workpiece connector (e.g., shrink sleeve). This workpiece connection piece serves not only for coupling the workpiece to the workpiece holder, but preferably also remains after the processing of the workpiece on this and then serves as a coupling interface of the workpiece in the intended installation situation, for example in an optical system. As a result, the fixing of the workpiece already takes place during its machining based on the workpiece connecting piece, which is also used later as a coupling interface in the intended installation situation, so that the relative position of the workpiece is the same both during machining of the workpiece and in the later intended installation situation ,

According to one embodiment, the workpiece holder is designed in several parts and at least one second workpiece-holding element is provided between the first workpiece-holding element and the workpiece connecting piece. This ensures that the first workpiece-holding element can be manufactured separately with high precision. This first workpiece-holding element serves as an interface to the frame holder and has highly accurately manufactured surfaces which bear against the frame holder. The second workpiece detection member connects the workpiece connector to the first workpiece detection member. Preferably, the second workpiece-clamping element comprises an upper and a lower workpiece-clamping element part. The upper and The lower workpiece-holding-element part has contact surfaces for the first workpiece-clamping element and for the workpiece-connecting piece, wherein these are clampably fixable between the upper and the lower workpiece-clamping element part. Due to the multi-part design of the workpiece holder a highly accurate fixation of the workpiece in this workpiece holder and a highly accurate recording of this workpiece holder in the holder holder can be achieved.

According to one embodiment, a circumferential or a plurality of distributed arranged contact surfaces for plan positioning of the workpiece holder are provided on the receiving area of the holder holder. These contact surfaces are formed for example by upwardly projecting surfaces, which are made for example by grinding with high precision, so that a planar positioning of the workpiece holder is achieved in the socket holder.

According to one embodiment, the socket holder on clamping means for clamping the workpiece holder in the receiving area. These clamping means are in particular designed such that the workpiece holder is pressed against a provided in the socket holder cone surface. The clamping means can be actively movable or manually operated or activatable clamping means by automatic drive means. By means of these clamping means, the workpiece holder can be fixed firmly and positionally accurate but releasably in the receiving area.

According to one embodiment, the clamping means are formed by clamping bolts, which are formed deliverable in the radial direction on the workpiece holder. Alternatively or additionally, the clamping means are adapted to clamp the workpiece holder in a direction perpendicular to the radial direction (i.e., directed, for example, towards the face positioning contact surfaces) in the receiving area. For this purpose, the clamping means may be formed by a clamping ring, which in addition to a sealing of free spaces or recesses on the contact surfaces for plan positioning of the workpiece holder directed towards clamping the workpiece holder in the holder holder causes. As a result, a highly accurate, releasable fixation of the workpiece holder is achieved in the socket holder.

According to one embodiment, the clamping means are adapted to effect an at least partial circumferential, in particular outer peripheral, positive locking on the workpiece holder. In particular, the clamping means have a projection which engages in a groove provided on the outer peripheral side on the workpiece holder, in particular the first workpiece-holding member. As a result, the clamping means cause a particularly advantageous positionally accurate fixation of the workpiece holder in the holder holder.

According to one embodiment, the clamping means are designed as self-locking clamping mechanism. In more detail, the clamping means are formed by spring-loaded clamping bolts, which are pressed by spring force into an advanced position. In this advanced position, the free ends of the clamping bolts act on the workpiece holder and fix it by clamping. The clamping bolts can be brought via suitable automatic or manual drive means in a retracted position, so that the clamping of the workpiece holder canceled and thus the workpiece holder is released.

According to one embodiment, the clamping means are deactivated by negative pressure or by a fluid under pressure, so that the clamping of the workpiece holder is canceled. For this purpose, channels may be provided in the socket holder in order to transmit the fluid actuating the clamping means or the negative pressure to the clamping means.

According to one embodiment, the socket holder is designed in several parts and has at least one lower and one upper socket holder part. The lower frame support part can for example form an interface to a processing machine in the lower region and have suitable means, for example fastening bores and / or a king bore, by way of which the lower frame support part can be fixed to the processing machine. Alternatively, the interface to the processing machine can be formed by a cylindrical attachment mandrel or a polygon taper, by means of which the lower holder support part can be fixed to the processing machine. In addition, the lower frame support part form the bottom of the receiving area and form one or more bottom-side contact surfaces for the workpiece holder. The upper frame support member may be formed, for example, annular and limit the receiving area radially outward. In addition, the clamping means can be fixed or integrated in the upper mounting bracket part.

According to one embodiment, the socket holder below the receiving area on a liquid receiving space, which is filled with a fluid to support the workpiece to be machined on the bottom side. For this purpose, one or more channels may be provided in the socket holder to the liquid receiving space with a Fluid, in particular to fill a liquid. Likewise, sealing means may be provided to seal the receiving area to the workpiece frame. The liquid receiving space may be directly and directly formed in the receiving space of the socket holder, ie, the fluid may be filled directly into the liquid receiving space and no further element (expanding wall, membrane, etc.) is provided which separates the fluid and the workpiece to be processed , Alternatively, the liquid receiving space can also be formed by a balloon-like structure, an expanding wall or a membrane which is provided in the receiving space and in which or under which the fluid is introduced. By filling the socket holder or the liquid receiving space with the fluid, the workpiece to be machined is supported on the workpiece side opposite the workpiece side to be machined, so that deformation of the workpiece by its own weight or when pressing a machining tool to the workpiece side to be machined prevented or at least substantially minimized.

• - Umfangsseitiges Fixieren des zu bearbeitenden optischen Werkstücks in der ringartigen Werkstückfassung;
• - Einspannen der Werkstückfassung in die Fassungshalterung, um das Werkstück an einer ersten Werkstückseite zu bearbeiten;
• - Vorzugsweise nach der Bearbeitung der ersten Werkstückseite, Ausspannen der Werkstückfassung aus der Fassungshalterung und Wenden der Werkstückfassung samt darin aufgenommenem Werkstück;
• - Einspannen der Werkstückfassung in die Fassungshalterung in der gewendeten Position, um das Werkstück an einer der ersten Werkstückseite gegenüberliegenden zweiten Werkstückseite zu bearbeiten.

According to a further aspect, the invention relates to a method for fixing workpieces to be machined, in particular optical workpieces in a fixing device. The fixing device comprises an annular workpiece holder and a holder holder, which has a receiving area for clamping the workpiece holder. The method comprises the following steps:

• - Peripheral fixing of the optical workpiece to be machined in the annular workpiece holder;
• - Clamping the workpiece holder in the socket holder to edit the workpiece on a first side of the workpiece;
• - Preferably after the processing of the first side of the workpiece, clamping the workpiece holder out of the holder holder and turning the workpiece holder together with the workpiece received therein;
• - Clamping the workpiece holder in the socket holder in the inverted position to edit the workpiece on a second side of the workpiece opposite the first workpiece side.

The term "high-precision or high-precision" in the sense of the present invention is understood to mean a fixing device which has a repeatable positioning accuracy or clamping situation of the workpiece holder in the same frame holder with multiple clamping and unclamping, in particular also with a previously described turning of the frame holder by 180 ° Range of for example 5 .mu.m to 0.05 .mu.m, in particular 1 .mu.m to 0.1 .mu.m allows.

For the purposes of the present invention, "fluid" means both liquid and gaseous media.

The expressions "approximately", "substantially" or "approximately" in the context of the invention mean deviations from the respective exact value by +/- 10%, preferably by +/- 5% and / or deviations in the form of changes insignificant for the function ,

Further developments, advantages and applications of the invention will become apparent from the following description of exemplary embodiments and from the figures. In this case, all described and / or illustrated features alone or in any combination are fundamentally the subject of the invention, regardless of their summary in the claims or their dependency. Also, the content of the claims is made an integral part of the description.

• 1 beispielhaft eine Ausführungsform einer Fixiervorrichtung in einer Explosionsdarstellung;
• 2 beispielhaft die Fixiervorrichtung gemäß 1 in einer Draufsichtdarstellung;
• 3 beispielhaft eine Schnittdarstellung der in 1 gezeigten Fixiervorrichtung entlang der in 2 gezeigten Schnittlinie A-A;
• 4 beispielhaft eine Schnittdarstellung der in 1 gezeigten Fixiervorrichtung entlang der in 2 gezeigten Schnittlinie B-B;
• 5 beispielhaft eine Schnittdarstellung der in 1 gezeigten Fixiervorrichtung entlang der in 2 gezeigten Schnittlinie C-C;
• 6 beispielhaft eine Schnittdarstellung der in 1 gezeigten Fixiervorrichtung entlang der in 2 gezeigten Schnittlinie D-D;
• 7 beispielhaft eine kuchenstückartige Schnittdarstellung der in 1 gezeigten Fixiervorrichtung in einer perspektivischen Ansicht; und
• 8 beispielhaft eine teilweise Explosionsdarstellung der Fixiervorrichtung, bei der die Werkstückfassung losgelöst von der Fassungshalterung dargestellt ist.

The invention will be explained in more detail below with reference to the figures of exemplary embodiments. Show it:

• 1 an example of an embodiment of a fixing device in an exploded view;
• 2 by way of example the fixing device according to 1 in a plan view;
• 3 exemplified a sectional view of in 1 shown fixing device along in 2 shown section line AA;
• 4 exemplified a sectional view of in 1 shown fixing device along in 2 shown section line BB;
• 5 exemplified a sectional view of in 1 shown fixing device along in 2 shown section line CC;
• 6 exemplified a sectional view of in 1 shown fixing device along in 2 shown section line DD;
• 7 by way of example a cake-like sectional view of the in 1 shown fixing device in a perspective view; and
• 8th by way of example a partial exploded view of the fixing device, in which the workpiece holder is shown detached from the frame holder.

1 shows an exploded view of a fixing device according to the invention 1 , The fixing 1 includes a workpiece holder 3 that the workpiece to be machined 2 receives.

Under workpiece is a part to be machined of any kind and formed from any material understood, which in the fixing device according to the invention 1 can be tensioned or machined. In particular, this may be an optical lens or a lens blank. The invention thus relates in particular to a lens-fixing device. The fixing device 1 further includes a socket holder 4 that have a reception area 4a forms in which the workpiece holder 3 can be used.

The mounting bracket 4 preferably also serves as an interface to the machine tool, by means of which the workpiece 2 is processed. In particular, the socket holder 4 an interface area 4b on, by means of the fixing device 1 abuts against a processing table of the processing machine. The interface of the fixing device 1 can be adapted to the machine tool and can in particular holes or openings for fixing the fixing device 1 on the processing machine and / or means for centering or alignment of the fixing device 1 relative to this processing machine, for example in the form of a king hole, a cylindrical mounting mandrel, a polygon cone, etc. have.

The detailed structure of the fixing device 1 as well as their mode of operation is described below on the basis of 2 to 7 described in more detail.

For holding the workpiece 2 in the workpiece holder 3 is on the workpiece 2 a workpiece connector 2.1 appropriate. The workpiece connector 2.1 is preferably annular, ie encloses the workpiece 2 Completely complete. The workpiece connector 2.1 For example, it may be formed by a metal ring, such as aluminum, brass or similar material. The workpiece connector 2.1 can via cohesive connection means, for example by an adhesive, preferably insoluble with the workpiece 2 be connected. Alternatively, the workpiece connector 2.1 positive and / or non-positive with the workpiece 2 be connected, for example, by shrinking. This workpiece connector 2.1 preferably remains after machining the workpiece 2 at this and serves, for example, in the later installation situation of the workpiece 2 for fixing in a corresponding receptacle.

The workpiece holder 3 itself is formed in several parts in the embodiment shown and comprises a first workpiece-holding element 3.1 , which preferably the radially outer part of the workpiece holder 3 forms. For connecting the workpiece 2 in particular of the workpiece 2 provided workpiece connection piece 2.1 with the first workpiece-clamping element 3.1 is at least a second workpiece-holding element 3.2 intended. In the exemplary embodiment shown, the second workpiece-holding element comprises 3.2 a lower and an upper workpiece-holding member part 3.2.1 . 3.2.2 , which are for example ring-shaped. The lower workpiece-holding element part 3.2.1 has radially inwardly a receptacle for the workpiece connector 2.1 on. In particular, this receptacle may have a lower contact surface and a radially the workpiece connector 2.1 enclosing contact surface for the workpiece connector 2.1 form. The the workpiece connector 2.1 radially enclosing bearing surface can be attached to the outer diameter of the workpiece connector 2.1 be adapted accurately or the contact surface may have an internal thread into which a corresponding external thread of the workpiece connecting piece 2.1 can be screwed.

In the radially outer region, the lower workpiece-holding element part 3.2.1 a receptacle for the first workpiece detection element 3.1 , in particular a lower contact surface and a radial contact surface for the first workpiece-clamping element 3.1 form. The radial contact surface, in turn, can, for example, fit precisely to the inner mold or the inner diameter of the first workpiece-holding element 3.1 be adapted or have an external thread on which a corresponding internal thread of the first workpiece-holding element 3.1 can be screwed on.

The two workpiece holder element parts 3.2.1 . 3.2.2 may preferably be relative to each other in the axial direction along a workpiece holder axis WMA , that are braced against each other in a direction perpendicular or substantially perpendicular to the workpiece clamping top side. This clamping preferably causes a clamping of the upper workpiece-holding element part 3.2.2 relative to the lower workpiece-holding element part 3.2.1 so that over the second workpiece-holding element 3.2 the workpiece connector 2.1 with the first workpiece-clamping element 3.1 is firmly connected.

The first workpiece-holding element 3.1 is preferably also formed like a ring. It serves to record the workpiece holder in a positionally accurate and replicable manner in relation to the rotational position and the spatial position 3 in the mounting bracket 4 , The first workpiece-holding element 3.1 is in terms of in 1 indicated transverse plane QE , which are perpendicular to the workpiece holder axis WMA runs, symmetrical, in particular formed mirror-symmetrically. This allows the workpiece holder 3 in two different mounting positions in the mounting bracket 4 be installed, in a first installation position in which the example in 1 overhead side of the workpiece 2 on the interface surface 4b the mounting bracket 4 opposite side shows and in a second mounting position in which the workpiece 2 180 ° around the one in the transverse plane QE extending transverse axis QA turned into the mounting bracket 4 is received, so that the top in the first installation position side now the interface surface 4b the mounting bracket 4 is arranged facing. This has the distinct advantage that the workpiece 2 over the workpiece holder 3 attached to the workpiece 2 remains, can be re-clamped positionally accurate, so that a machining of both sides of the workpiece is made possible, with a fixed location reference to each other (see. 8th ).

To achieve a high positioning accuracy, the first workpiece-sensing element 3.1 outer circumference conical surfaces 3.1.1 . 3.1.1 ' on, with a first conical surface 3.1.1 above the transverse plane QE and a second cone surface 3.1.1 ' below the transverse plane QE is provided. The cone surfaces 3.1.1 . 3.1.1 ' can be annular, in particular annular or ring-segment-like design. The cone surfaces 3.1.1 . 3.1.1 ' are arranged in particular such that they are the first workpiece-holding element 3.1 taper to opposite sides, ie the circumference of the workpiece-holding element 3.1 takes from a central area towards the upper and lower side surfaces 3.1.2 . 3.1.3 down.

Depending on the mounting position, a cone surface acts in each case 3.1.1 . 3.1.1 ' with a corresponding conical surface 4.1 the mounting bracket 4 together, a spatially centered introduction of the workpiece holder 3 in the mounting bracket 4 to enable. The cone surface 4.1 is, for example, as in 3 shown, the receiving area on the circumference 4a the workpiece holder 3 surrounding provided. The cone surface 4.1 is doing so to the cone surface 3.1.1 . 3.1.1 ' of the first workpiece-holding element 3.1 adapted (for example by means of an inverse inclination of the conical surface) that this along the Werkstückfassungsmittelachse WMA extending insertion movement in the socket holder 4 is centered.

Furthermore, the workpiece holder points 3 , in particular the first workpiece-holding element 3.1 , an at least partially, preferably circumferentially circumferential groove 3.1.4 on. In this groove 3.1.4 can be clamping devices 5 , as described in more detail below, intervene to secure the workpiece holder 3 in the mounting bracket 4 or in the direction of the workpiece holder axis WMA directed pressing against the mounting bracket 4 to ensure.

The upper and lower side surface 3.1.2 . 3.1.3 of the first workpiece-holding element 3.1 are preferably ground flat and serve as contact surfaces against corresponding contact surfaces 4.2 the mounting bracket 4 , In the embodiment shown are in the side surfaces 3.1.2 . 3.1.3 groove 3.1.5 or indentations provided with inversely formed projections 4.3 the mounting bracket 4 interact. In particular, the grooves 3.1.5 or notches and the projections 4.3 conformed to each other so that the projections 4.3 positive fit in the grooves 3.1.5 or indentations engage and thus with respect to the rotational position positionally accurate introduction of the workpiece holder 3 in the mounting bracket 4 enable.

To the workpiece holder 3 in both mounting positions in the same rotational position in the socket holder 4 can bring a marking the rotational position marking on the workpiece holder 3 be provided with a corresponding mark on the socket holder 4 interacts. Alternatively or additionally, the grooves 3.1.5 or notches and the projections 4.3 have a special, coded arrangement, so that the arrangement of the workpiece holder 3 in the mounting bracket 4 only in a single rotational position is possible.

Below is the mount bracket 4 described in more detail. The mounting bracket 4 is, as in particular in the 3 to 6 recognizable, cup-like or substantially cup-shaped. This also allows workpieces 2 be machined on both sides with a convex curved surface area. In the illustrated embodiment, the socket holder 4 formed in several parts and consists essentially of a lower and an upper socket holder part 4A . 4B , This multi-part design is advantageous for manufacturing reasons. However, the mount bracket can 4 also be formed from a single holder holder part.

The lower socket holder part 4A includes the interface surface 4b and a top side of the interface surface 4b protruding ring-like section 4.5 , on the upper side of the preferably circumferentially distributed contact surfaces 4.2 as well as in the grooves 3.1.5 engaging projections 4.3 are provided.

The upper socket holder part 4B is designed to be on the lower frame support part 4A placed on the top side and to be fixed to this. The fixation of the mounting bracket parts 4A . 4B against each other can be done by any connection means, in particular by screwing or by a on the ring-like section 4.5 provided on the outer side outer thread, with a corresponding inner peripheral side provided internal thread of the upper frame support part 4B interacts.

The upper socket holder part 4B For example, is formed like a ring and has the inside circumference of the conical surface 4.1 depending on the installation position with one of the conical surfaces 3.1.1 . 3.1.1 ' of the first workpiece-holding element 3.1 interacts.

As previously stated, are on the mount bracket 4 clamping means 5 provided by means of which a backup of the workpiece holder 3 in the mounting bracket 4 is effected. As in particular in the 6 and 7 Recognizable, the clamping devices 5 in the illustrated embodiment by clamping bolts 5.1 formed, the radially inward, ie in the direction of the workpiece holder axis WMA be deliverable, thereby the workpiece holder 3 to fix. In other words, the clamping bolts 5.1 displaceable in the radial direction in the socket holder 4 , in particular in the upper mounting bracket part 4B guided. In the embodiment shown, several such clamping bolts are circumferentially distributed 5.1 intended.

The clamping devices 5 are self-locking in the illustrated embodiment, ie without applying external forces are the clamping means 5 held in the securing position, ie they fix the workpiece holder even without external forces 3 inside the frame holder 4 , These are the clamping bolts 5.1 by elastic elements, in particular by spring elements 5.2 held in an advanced position. At the workpiece holder 3 facing free end have the clamping bolt 5.1 one projection each 5.1.1 on, to those on the first workpiece-holding element 3.1 provided outer peripheral side groove 3.1.4 conformed and to engage in this groove 3.1.4 is trained. Through the clamping devices 5 , in particular the clamping bolts 5.1 For example, it is ensured that the workpiece holder 3 centered in the frame holder 4 held while the contact surfaces 4.2 the same is pressed.

Deactivating the clamping devices 5 , in particular the clamping bolt 5.1 can be done manually. In the embodiment shown are means for automatically deactivating the clamping means 5 or the clamping bolt 5.1 intended. Here, the clamping bolts 5.1 be positioned by the application of a vacuum or alternatively a pressurized fluid from the advanced position to a retracted position, so that the projection 5.1.1 the clamping bolt 5.1 no longer in the groove 3.1.4 the workpiece holder 3 engages and thus the workpiece holder 3 from the mounting bracket 4 can be removed.

For supplying the vacuum or the pressurized fluid to the clamping bolt 5.1 are in the mount bracket 4 gas channels 6 brought in. As in particular in 4 recognizable, is at the lower frame support part 4A a gas connection 6.1 provided, via gas duct sections 6.2 with a ring channel 6.3 is fluidically connected. This ring channel 6.3 preferably runs on the outer peripheral side around the ring-shaped section 4.5 around. The on the lower frame support part 4A attached upper Fassungshalterungsteil 4B also has gas channel sections 6.4 on, with the ring channel 6.3 are fluidically connected and via the supply of the vacuum or the pressurized fluid to the clamping bolt 5.1 he follows.

In the transition area between the workpiece holder 3 and the mounting bracket 4 is a ring-like cover 7 intended. This ring-like cover 7 is formed in the illustrated embodiment, a contamination of the fixing device 1 in the area between the workpiece holder 3 and the mounting bracket 4 to prevent. For this purpose, the cover member 7 preferably sealing elements, which bear against the workpiece holder 3 and the mounting bracket 4 and thus dust-proof and in particular also fluid-tight seal the transition region, thereby preventing penetration of particles formed during workpiece machining or fluids used in the processing.

In addition to this covering effect, the cover 7 also as a clamping device 5 be used, in particular to the workpiece holder 3 opposite the contact surfaces 4.2 the mounting bracket 4 to press.

As in particular in the 3 and 5 to recognize, the socket holder 4 the fixing device 1 a fluid receiving space 4.4 on. This fluid receiving space 4.4 is for example through a basin-like recess 8th at the lower frame support part 4A educated. In this fluid receiving space 4.4 For example, a fluid, in particular a fluid, for example water, can be introduced to the fluid receiving space 4.4 up to the workpiece to be machined 2 to fill with the fluid. This allows the workpiece to be machined 2 bottom side, ie at the lower frame support part 4A supported side, so that deformation of the workpiece 2 through one through the Self-weight of the workpiece caused sagging or by an upper-side force in the machining process is at least largely avoided.

For filling the liquid receiving space 4.4 with the fluid is in the lower frame support part 4A a fluid supply channel 8.1 intended. About this fluid supply channel 8.1 may be a fluid, in particular a liquid in the liquid receiving space 4.4 be initiated. In addition, in the lower mounting bracket part 4A a vent channel 8.2 Be provided over the in the liquid receiving space 4.4 contained air can escape when introducing the fluid.

Preferably, when filling the liquid receiving space 4.4 the fixing device 1 positioned so that the with the venting channel 8.2 connected opening in the liquid receiving space 4.4 the highest point of the fluid receiving space 4.4 forms, so after the escape of air from the liquid receiving space 4.4 the entire area below the workpiece 2 filled with the fluid and thereby a sufficient support of the workpiece 2 given during workpiece machining.

For sealing the liquid receiving space 4.4 in the direction of the workpiece holder 3 may be a ring-like sealing element 9 be provided. This preferably extends circumferentially in the region between the lower holder holder part 4A and the second workpiece-sensing element 3.2 and thus prevents penetration of the fluid or fluid into areas between the workpiece holder 3 and the mounting bracket 4 ,

The invention has been described above by means of exemplary embodiments. It is understood that numerous changes and modifications are possible without thereby leaving the scope defined by the claims.

LIST OF REFERENCE NUMBERS

1

fixing

2

workpiece

2.1

Workpiece connector

3

Workpiece amended

3a

Workpiece version of meaning

3.1

first workpiece-holding element

3.1.1, 3.1.1 '

conical surface

3.1.2

upper side surface

3.1.3

lower side surface

3.1.4

groove

3.1.5

groove

3.2

second workpiece detection element

3.2.1

lower workpiece-holding element part

3.2.2

Upper workpiece-holding element part

4

base support

4a

reception area

4b

Interface surface

4A

lower socket holder part

4B

Upper socket holder part

4.1

conical surface

4.2

contact surface

4.3

head Start

4.4

Liquid holding space

4.5

section

5

clamping means

5.1

clamping bolt

5.1.1

head Start

5.2

spring element

6

gas channel

6.1

gas connection

6.2

Gas channel section

6.3

annular channel

6.4

Gas channel section

7

cover

8th

recess

8.1

Supply channel

8.2

vent channel

9

sealing element

QA

transverse axis

QE

transverse plane

WMA

Workpiece central axis version

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 10139805 C1 [0003]
• EP 2163345 A1 [0004]

Claims (19)

Fixing device for positionally accurate fixing of workpieces to be machined (2) comprising: - A workpiece holder (3) having at least one first, radially outward workpiece-holding element (3.1), which is ring-shaped, surrounds the workpiece (2) on the circumference and in which the workpiece (2) can be fixed in a workpiece-clamping inner region (3a); and - A socket holder (4) having a receiving area (4a) for clamping the workpiece holder (3); wherein the first workpiece-clamping element (3.1) is constructed symmetrically with respect to a transverse plane (QE) perpendicular to the workpiece-mounting center axis (WMA), in such a way that the workpiece holder (3) in a first mounting position and in a first mounting position (3.1) for the first installation position about a in the transverse plane (QE) extending transverse axis (QA) by 180 ° rotated, second mounting position in the socket holder (4) can be clamped. Fixing device after Claim 1 , characterized in that the first workpiece-holding element (3.1) has circumferentially arranged on opposite sides with respect to the transverse plane (QE) conical surfaces (3.1.1, 3.1.1 '). Fixing device after Claim 2 , characterized in that the conical surfaces (3.1.1, 3.1.1 ') of the first workpiece-holding element (3.1) are formed in opposite directions, in such a way that the circumference of the first workpiece-holding element (3.1) to the upper and lower side surface (3.1. 2, 3.1.3) of the first workpiece-holding element (3.1) down. Fixing device after Claim 2 or 3 , characterized in that the conical surfaces (3.1.1, 3.1.1 ') of the first workpiece-holding element (3.1) are ring-like or ring-segment-like. Fixing device according to one of the preceding claims, characterized in that the receiving region (4a) of the holder holder (4) on the inner peripheral side has at least one ring-like or ring-segment-like conical surface (4.1). Fixing device according to one of the preceding claims, characterized in that the first workpiece-holding element (3.1) has circumferentially a continuous circumferential groove (3.1.4) or distributed circumferentially arranged groove segments. Fixing device according to one of the preceding claims, characterized in that the first workpiece-holding element (3.1) on the upper and lower side surface (3.1.2, 3.1.3) at least one groove (3.1.5), at least one notch and / or at least one respectively from the side surface (3.1.2, 3.1.3) projecting projection which cooperate with at least one corresponding projection (4.3), at least one groove or at least one notch in the receiving area (4a) of the socket holder (4) form fit. Fixing device according to one of the preceding claims, characterized in that the workpiece holder (3) for receiving a workpiece (2) circumferentially enclosing workpiece connecting piece (2.1) is formed. Fixing device after Claim 8 , characterized in that the workpiece holder (3) is designed in several parts and between the first workpiece-holding element (3.1) and the workpiece connecting piece (2.1) at least one second workpiece-holding element (3.2) is provided. Fixing device according to one of the preceding claims, characterized in that on the receiving area (4a) of the frame holder (4) a circumferential or more distributed contact surfaces (4.2) for plan positioning of the workpiece holder (3) are provided. Fixing device according to one of the preceding claims, characterized in that the holder holder (4) has clamping means (5) for clamping the workpiece holder (3) in the receiving region (4a). Fixing device after Claim 11 , characterized in that the clamping means (5) by clamping bolts (5.1) are formed, which in the radial direction on the workpiece holder (3) are deliverable and / or that the clamping means (5) are adapted to the workpiece holder (3) in a direction perpendicular to the radial direction direction in the receiving area (4a) clamp. Fixing device after Claim 11 or 12 , characterized in that the clamping means (5) are adapted to effect an at least partial circumferential positive locking on the workpiece holder (3). Fixing device after Claim 13 , characterized in that the clamping means (5) have a projection (5.1.1) which is designed to engage in the circumferential groove (3.1.4) of the workpiece holder (3). Fixing device according to one of the preceding Claims 11 to 14 , characterized that the clamping means (5) are designed as self-locking clamping mechanism. Fixing device after Claim 15 , characterized in that the clamping means (5) can be deactivated by negative pressure or by a fluid under pressure, so that the clamping of the workpiece holder (3) is canceled. Fixing device according to one of the preceding claims, characterized in that the socket holder (4) is designed in several parts. Fixing device according to one of the preceding claims, characterized in that the holder holder (4) below the receiving area (4a) has a liquid receiving space (4.4) which can be filled with a fluid to support the workpiece to be machined (2) on the bottom side. Method for fixing workpieces (2) to be machined in a fixing device (1) comprising an annular workpiece holder (3) and a holder holder (4), wherein the holder holder (4) has a receiving region (4a) for clamping the workpiece holder (3), comprising the following steps: - Peripheral fixing of the optical workpiece to be machined (2) in the annular workpiece holder (3); - Clamping the workpiece holder (3) in the socket holder (4) to edit the workpiece (2) on a first side of the workpiece; - Unclamping the workpiece holder (3) from the holder holder (4) and turning the workpiece holder (3) including therein received workpiece (2); - Clamping the workpiece holder (3) in the socket holder (4) in the inverted position to edit the workpiece (2) on one of the first workpiece side opposite the second workpiece side.

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