WORKPIECE CARRIER AND METHOD FOR ITS PRODUCTION

Abstract

A workpiece carrier and method for producing a workpiece carrier (10) for providing and handling workpieces in high-temperature ovens for high-temperature treatment or similar, said workpiece carrier being made of a support grid (11) having workpiece holders (12) for positioning workpieces on the workpiece carrier, said support grid being made of support struts (14, 15, 16, 17, 19, 20) forming a grid structure (21), said support struts being made of carbon fiber-reinforced carbon (CFC), said workpiece holders being made of positioning devices (22) of the work-piece carrier arranged on the support struts, said positioning devices being arranged on the support struts such that the workpiece can be arranged on the workpiece holder in a predetermined position, said positioning devices comprising a bearing element (24) made of a ceramic fiber composite material, said positioning device being a support element (23) arranged on a support strut for arranging the bearing element.

Claims

1. A workpiece carrier (10, 26) for providing and handling workpieces in high-temperature ovens for high-temperature treatment or similar, said workpiece carrier being made of a support grid (11, 28) having workpiece holders (12, 39) for positioning workpieces on the workpiece carrier, said support grid being made of support struts (14, 15, 16, 17, 19, 20, 29, 30, 31, 32) forming a grid structure (21), said support struts being made of carbon fiber-reinforced carbon (CFC), said workpiece holders being made of positioning devices (22, 27) of the workpiece carrier arranged on the support struts, said positioning devices being arranged on the support struts and being realized in such a manner that workpieces (40) can be arranged on the workpiece holders in a predetermined position, characterized in that the positioning device comprises a bearing element (24, 34) for arranging workpieces, said bearing element being made of a ceramic fiber composite material, said positioning device comprising a support element (23, 33) arranged on a support strut for arranging the bearing element.

2. The workpiece carrier according to claim 1, characterized in that the ceramic fiber composite material is made of an oxide ceramic, preferably an inorganic matrix of aluminum oxide, mullite, zirconium oxide, silicon carbide or silicon nitride.

3. The workpiece carrier according to claim 1, characterized in that the ceramic fiber composite material is made of inorganic fibers, preferably reinforcing fibers made of aluminum oxide, mullite, zirconium oxide, silicon carbide and/or silicon nitride.

4. The workpiece carrier according to claim 3, characterized in that the fibers form a fiber composite, preferably an unstructured, wound or interwoven fiber composite.

5. The workpiece carrier according to claim 1, characterized in that the bearing elements (24, 34) are arranged parallel to each other.

6. The workpiece carrier according to claim 1, characterized in that the workpiece holders (12, 39) are formed having a V-shape.

7. The workpiece carrier according to claim 1, characterized in that the bearing element (24, 34) has a wall thickness of >0.5 mm to <5 mm.

8. The workpiece carrier according to claim 1, characterized in that the support element (23, 33) is made of graphite.

9. The workpiece carrier according to claim 1, characterized in that the bearing element (24, 34) forms a carrier contour (43) having a bearing surface (25, 42) for arranging workpieces (40) on the bearing element.

10. The workpiece carrier according to claim 9, characterized in that the support element (23, 33) forms an abutment contour (36) which is adjusted to the bearing contour of the bearing element.

11. The workpiece carrier according to claim 9, characterized in that the support element (23, 33) is borne or inserted on a support strut (19, 29), preferably being connected to the support strut in a form-fit manner.

12. The workpiece carrier according to claim 1, characterized in that the bearing surface (24, 34) is borne or inserted on the support element (23, 33), preferably being connected to the support element in a form-fit manner.

13. The workpiece carrier according to claim 1, characterized in that the bearing element (24, 34) and/or the support element (23, 33) is profile-shaped.

14. The workpiece carrier according to claim 1, characterized in that the support grid (11, 28) comprises a support frame (13) made of support struts (14, 15, 16, 17, 19, 20, 29, 30, 31, 32), said support frame comprising bearing elements (18) made of graphite by means of which the support struts (17) are connected.

15. A workpiece carrier construction set comprising a workpiece carrier (10, 26) according to claim 1, having a first set of positioning devices (22, 27) and a second set of positioning devices different to the first set, said positioning devices being able to be arranged on the support struts (19, 29) and being realized in such a manner that first workpieces (40) and/or second workpieces different to the first workpieces can be arranged on the workpiece holders (12, 39).

16. A method for producing a workpiece carrier (10, 26) for providing and handling workpieces in high-temperature ovens for high-temperature treatment or similar, said workpiece carrier being made of a support grid (11, 28) having workpiece holders (12, 39) for positioning workpieces on the workpiece carrier, said support grid being made of support struts (14, 15, 16, 17, 19, 20, 29, 30, 31, 32) forming a grid structure (21), said support struts being made of carbon fiber-reinforced carbon (CFC), said workpiece holders being made of positioning devices (22, 27) of the workpiece carrier made of the support struts, said positioning devices being arranged on the support struts and being realized in such a manner that workpieces (40) can be arranged on the workpiece holders in a predetermined position, characterized in that a bearing element (24, 34) of the positioning device for arranging workpieces is made of a ceramic fiber composite material, a support element (23, 33) of the positioning element for arranging the bearing element is arranged on the support strut.

Description

BRIEF DESCRIPTION OF THE DRAWING FIGURES

[0026] In the following, preferred embodiments of the invention are further described with reference to the attached drawings.

[0027] In the drawings,

[0028] FIG. 1 illustrates a workpiece carrier in a perspective view;

[0029] FIG. 2 illustrates the workpiece carrier in a top view;

[0030] FIG. 3 illustrates a cross-sectional view of a workpiece carrier.

DETAILED DESCRIPTION

[0031] A synopsis of FIGS. 1 and 2 shows a workpiece carrier 10 for providing and handling workpieces in high-temperature ovens. The workpiece carrier 10 is made of a support grid 11 having workpiece holders 12 for positioning workpieces (not illustrated in this instance) on the workpiece carrier 10. The support grid 11 is made of a support frame 13 made of support struts 14, 15, 16, 17 and bearing elements 18 made of graphite. Support struts 19, 20 form a grid structure 21 of the support grid 11. All support struts 14 to 17 and 20, 21 consist of carbon fiber-reinforced carbon (CFC) and are inserted into one another.

[0032] The workpiece carrier 10 further comprises positioning devices 22 which are each made of a support element 23 and a bearing element 24. The support element 23 consists of graphite, and the bearing element 24 consists of a ceramic fiber composite material. The support element 23 is inserted on support strut 19 in each instance, the bearing element 24 being inserted on the support element 23. Between the positioning devices 22 arranged parallel, it has become possible to insert workpieces into the thus formed workpiece holders 12, said workpieces being merely contacted with a surface 25 of the bearing element 24. An undesired contamination of workpieces, for example, via a physical contact with components made of carbon can be thus prevented.

[0033] FIG. 3 shows a partial cross-sectional view of a workpiece carrier 26, a cut extending orthogonally to the positioning devices 27 of the workpiece carrier 26, in this instance. A support grid 28 of the workpiece carrier 26 is made of support struts 29, 30, 31 and 32. The support struts 29 to 32 consist of carbon fiber-reinforced carbon (CFC) and are loosely inserted into on another. The positioning devices 27 are made of a support element 33 made of graphite and a bearing element 34 made of a ceramic fiber composite material. The support elements 33 each comprise a longitudinal groove 35 in this instance, by means of which they are inserted on support struts 29. The bearing element 34 is loosely borne on the support element 33 and nestles against an abutment contour 36 of the bearing element 34. A projecting collar 38 is formed on the bearing element 34 at an upper end 37, said collar 38 enabling hooking the bearing element 34 into the support element 33 and thus a form-fit fixation. Nevertheless, a thermal expansion of the bearing element 34 independent from the support element 33 is possible. Between the positioning devices 27 arranged parallel, a workpiece holder 39 is thus formed for turbine buckets 41 realized as exemplary workpieces 40. The bearing elements 34 form a bearing surface 42 for a punctiform abutment of the turbine buckets 41. Accordingly, a bearing contour 43 of a bearing element 34 essentially corresponds to the abutment contour 36 of the support element 33.