EP3144622B1 - Porte-pièce - Google Patents

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Publication number
EP3144622B1
EP3144622B1 EP16188891.2A EP16188891A EP3144622B1 EP 3144622 B1 EP3144622 B1 EP 3144622B1 EP 16188891 A EP16188891 A EP 16188891A EP 3144622 B1 EP3144622 B1 EP 3144622B1
Authority
EP
European Patent Office
Prior art keywords
workpiece
workpiece carrier
carrier
indentations
workpieces
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.)
Active
Application number
EP16188891.2A
Other languages
German (de)
English (en)
Other versions
EP3144622A1 (fr
Inventor
Eduard Michael Lassel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Graphite Materials GmbH
Original Assignee
Graphite Materials GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Graphite Materials GmbH filed Critical Graphite Materials GmbH
Publication of EP3144622A1 publication Critical patent/EP3144622A1/fr
Application granted granted Critical
Publication of EP3144622B1 publication Critical patent/EP3144622B1/fr
Active legal-status Critical Current
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D5/00—Supports, screens, or the like for the charge within the furnace
    • F27D5/0006—Composite supporting structures
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0006—Details, accessories not peculiar to any of the following furnaces
    • C21D9/0018—Details, accessories not peculiar to any of the following furnaces for charging, discharging or manipulation of charge
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/12—Travelling or movable supports or containers for the charge

Definitions

  • the present invention relates to a workpiece carrier for high-temperature processes, in particular thermochemical vacuum processes, a corresponding charging system and a low-pressure carburizing process with corresponding workpiece carriers and / or a corresponding charging system.
  • the workpiece carrier is designed like a tray.
  • the workpieces can be placed next to each other on the workpiece carrier and should, if possible, rest in a defined position on the workpiece carrier.
  • several workpiece carriers are usually arranged one above the other in a frame.
  • the workpiece carriers arranged one above the other are introduced into the high-temperature device in order to treat the workpieces accordingly.
  • Heat treatment using high-temperature processes involves high temperatures, high pressures and high weight loads. Gases or other aggressive media are also used. When using metallic workpiece carriers, these influences often lead to dimensional changes, changes in shape and brittleness of the workpiece carrier material.
  • CFC workpiece carriers made of carbon fiber reinforced carbon, or CFC for short.
  • CFC workpiece carriers have a significantly lower weight than corresponding metal workpiece carriers.
  • the comparable carrier system can therefore achieve an additional load of 70 percent based on the weight of the workpieces resting on the workpiece carrier. Since the CFC workpiece carriers are distortion-free, the precise arrangement of the workpieces is guaranteed. Ultimately, this precise storage of the workpieces enables automatic loading and unloading the frames using appropriate special manipulators.
  • US-A 3,314,666 discloses a workpiece carrier comprising a flat support surface, the support surface being traversed by trough-shaped depressions.
  • the workpiece is made of SiC on a base of Al silicate.
  • the invention is based on the object of designing a workpiece carrier in such a way that the process gases act on the workpiece surface evenly and consistently.
  • the invention is based on the basic idea of substituting a flat workpiece support of a workpiece carrier, in particular for a low-pressure carburizing process, with a point-shaped workpiece support. Nevertheless, due to the large number of support points, the workpiece rests on an almost closed support surface. This self-contained and uniform support prevents the workpiece from warping or bending during carburizing and/or cooling.
  • the flat or flat receiving surfaces are crossed by channel-shaped depressions.
  • the trough-shaped depressions form the passages for the process gas. They direct the process gas to the workpiece surface. In this way, the process gas can diffuse into all areas of the workpiece surface. This means that there are no shadows on the workpiece surface.
  • the depressions reduce the resistance of the gas flow during low-pressure carburizing, enabling rapid and uniform cooling during the subsequent high-pressure gas quenching.
  • the trough-shaped depressions are advantageously arranged in such a way that they do not run parallel to one another, but rather run at a certain angle to one another, so that the depressions overlap and form support surface islands with relatively small surfaces between them.
  • the workpiece support surface with recesses that run at right angles to one another, so that the recesses and the receiving points arranged between the recesses result in a checkerboard pattern.
  • This checkerboard-like arrangement is particularly uniform.
  • the distribution of the process gas on the surfaces of the workpieces is exceptionally homogeneous.
  • An embodiment is also conceivable in which a truncated pyramid of larger width and length is initially provided, on which a truncated pyramid of smaller width and length is placed. In this way, a step or a recess is formed between the two truncated pyramids.
  • the receiving points are designed in a pyramid shape.
  • the workpiece carrier in a grid-like manner.
  • the receiving points separated from each other by the channel-shaped depressions are each arranged only on the grid bars.
  • the invention also includes a charging system with a plurality of workpiece carriers designed in accordance with the invention and preferably arranged one above the other. These workpiece carriers are in turn advantageously arranged one above the other in a frame.
  • the workpiece carrier 1 is constructed like a grid.
  • This workpiece support surface is framed by the frame strips 4.
  • the workpiece carrier 1 can, for example, not be in the drawing figures
  • the frame shown can be inserted and held by this frame.
  • each corner area and the center of the workpiece carrier are penetrated by a receiving hole 10. Bolts not shown in the drawing figures can be inserted or screwed into these receiving holes 10.
  • feet, support feet or otherwise designed support elements which are not shown in the drawing figures, are formed in order to be able to place the workpiece carriers 1 on a surface, for example the bottom of a high-temperature oven, or to be able to stack several workpiece carriers 1 on top of each other.
  • the support elements are designed as support columns, several workpiece carriers 1 resting on these columns, stacked one above the other and the stack of workpiece carriers can be inserted into a high-temperature oven.
  • the support elements can therefore fulfill the dual function of spacers between two workpiece carriers 1 on the one hand and of feet for the workpiece carriers on the other hand.
  • the frame strips 4 can again be seen. Also visible are the trough-shaped depressions 5 and the receiving points 6 formed between the depressions 5.
  • the trough-shaped depressions form the passageways for the process gas, which acts on the surface of a workpiece placed on the workpiece carrier 1 and is not shown in the figures and diffuses into the workpiece surface .
  • the recording points 6 are designed as square truncated pyramids.
  • the Fig. 3 In the left part shows quite flat recording points 6, which are again designed in the manner of truncated pyramids. In the right part of the Fig. 3 On the other hand, higher recording points 6 are shown which are smaller in width and length. These smaller and higher recording points 6 in turn lead to depressions 5 with greater depth.
  • Each recording point 6 consists of a truncated pyramid with a larger length and width, on which a second truncated pyramid with a smaller length and width is placed. This increases the height of the recording points 6 or the depth of the depressions 5.
  • Fig. 5 finally shows an embodiment of the recording points 6, which are designed as tapering pyramids. Here the contact area of the recording points 6 with the workpieces is minimized.
  • the grid-like structure of the workpiece carrier 1 according to Fig. 1 with the longitudinal struts 2 running in the longitudinal direction 8 and the transverse struts 3 running in the transverse direction 9 as a workpiece support surface and the openings 7 enclosed between the longitudinal struts 2 and cross struts 3 have proven to be very practical.
  • Such a workpiece carrier has a low weight, supports the placed workpieces securely and ensures a good supply of the workpiece surfaces with the process gas.
  • the longitudinal struts 2 and cross struts 3 provided with the receiving points 6 and recesses 5 ensure a secure positioning of the workpieces on the workpiece carrier 1, which enables automated loading and unloading of the workpiece carriers 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)

Claims (7)

  1. Support de pièce à traiter (1), réalisé en un carbone renforcé de fibres de carbone et pourvu d'une face plane d'accueil de la pièce à traiter, la face d'accueil de la pièce à traiter étant traversée par des creux (5) en forme de rainure, et les creux (5) en forme de rainure constituant des voies de passage pour un gaz de process.
  2. Support de pièce à traiter (1) selon la revendication 1, caractérisé en ce que les creux (5) se chevauchent, divisant ainsi la face d'accueil de la pièce à traiter en une pluralité de points de réception (6) disposés les uns à côté des autres.
  3. Support de pièce à traiter (1) selon les revendications 1 ou 2, caractérisé en ce que plusieurs creux (5) s'étendent longitudinalement (8) et d'autres creux (5) s'étendent transversalement (9), de manière à ce que les points de réception (6) soient disposés les uns à côté des autres à la manière des cases d'un échiquier.
  4. Support de pièce à traiter (1) selon l'une des revendications 1 à 3, caractérisé par des points de réception (6) en forme de tronc de pyramide.
  5. Support de pièce à traiter (1) selon la revendication 4, caractérisé par des points de réception (6) en forme de tronc de pyramide, constitués d'un tronc de pyramide en tant que base dont la longueur et la largeur sont plus importantes, et d'un deuxième tronc de pyramide, posé sur ce dernier, dont la longueur et la largeur sont moins importantes.
  6. Support de pièce à traiter (1) selon l'une des revendications 1 à 5, caractérisé par une face d'accueil de la pièce à traiter qui ressemble une grille pourvue d'une pluralité d'interruptions (7).
  7. Système de chargement par lots, destiné à une installation sous vide et comportant plusieurs supports de pièces à traiter (1) selon l'une des revendications 1 à 6 qui sont superposés les uns aux autres.
EP16188891.2A 2015-09-16 2016-09-15 Porte-pièce Active EP3144622B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE202015104929 2015-09-16

Publications (2)

Publication Number Publication Date
EP3144622A1 EP3144622A1 (fr) 2017-03-22
EP3144622B1 true EP3144622B1 (fr) 2023-11-01

Family

ID=57003352

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16188891.2A Active EP3144622B1 (fr) 2015-09-16 2016-09-15 Porte-pièce

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EP (1) EP3144622B1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018101994A1 (de) * 2018-01-30 2019-08-01 Ald Vacuum Technologies Gmbh Vorrichtung zur Abstützung metallischer Werkstücke und Verfahren zur thermochemischen Behandlung
DE102020123322A1 (de) * 2020-09-07 2022-03-10 Ald Vacuum Technologies Gmbh Fluidführung zur Abschreckung metallischer Werkstücke

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3314666A (en) * 1964-11-10 1967-04-18 Cyprus Mines Corp Fast fire tunnel kiln
DE19651408C2 (de) * 1996-12-11 2001-04-19 Fraunhofer Ges Forschung Werkstückträger zum Wärmebehandeln von Werkstücken und Verwendung des Werkstückträgers
DE10312802B3 (de) * 2003-03-21 2004-07-22 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Werkstückträger zum Wärmebehandeln von Werkstücken
DE20319600U1 (de) * 2003-12-17 2004-03-18 Sgl Carbon Ag Werkstückträger aus faserverstärkter Keramik zum Wärmebehandeln von Werkstücken
DE102006004902A1 (de) * 2005-02-02 2006-08-24 Gtd Graphit Technologie Gmbh Gitterrost aus kohlenstofffaserverstärktem Kohlenstoff
CN101960245A (zh) * 2008-03-05 2011-01-26 日本碍子株式会社 陶瓷烧成用窑工具板
JP5972831B2 (ja) * 2013-06-06 2016-08-17 東洋炭素株式会社 熱処理炉用治具

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EP3144622A1 (fr) 2017-03-22

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