EP3144622B1 - Workpiece carrier - Google Patents
Workpiece carrier Download PDFInfo
- 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
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- 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.)
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- 239000000969 carrier Substances 0.000 claims description 26
- 238000000034 method Methods 0.000 claims description 21
- 238000007373 indentation Methods 0.000 claims 5
- 239000011203 carbon fibre reinforced carbon Substances 0.000 claims 1
- 239000007789 gas Substances 0.000 description 15
- 238000005255 carburizing Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 230000000284 resting effect Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 239000012876 carrier material Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
Images
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)
Description
Die vorliegende Erfindung betrifft einen Werkstückträger für Hochtemperaturprozesse, insbesondere thermochemische Vakuumprozesse, ein entsprechendes Chargiersystem und ein Niederdruckaufkohlungsverfahren mit entsprechenden Werkstückträgern und / oder einem entsprechenden Chargiersystem.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.
Auf derartige Werkstückträger werden einzelne Werkstücke aufgelegt, um in einer Vorrichtung behandelt zu werden. Der Werkstückträger ist dabei tablarartig ausgebildet. Die Werkstücke können auf dem Werkstückträger nebeneinander aufgelegt werden und sollen möglichst in einer definierten Position auf dem Werkstückträger aufliegen. Für den Hochtemperaturprozess werden mehrere Werkstückträger in der Regel in einem Gestell übereinander angeordnet. Die so übereinander angeordneten Werkstückträger werden in die Hochtemperatureinrichtung eingebracht, um die Werkstücke entsprechend zu behandeln.Individual workpieces are placed on such workpiece carriers in order to be treated in a device. 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. For the high-temperature process, 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.
Bei der Wärmebehandlung mit Hilfe von Hochtemperaturprozessen treten hohe Temperaturen, hohe Drücke, und hohe Gewichtsbelastungen auf. Außerdem werden Gase oder andere aggressive Medien eingesetzt. Bei der Verwendung von metallischen Werkstückträgern führen diese Einflüsse häufig zu Maßänderungen, Formänderungen und zur Versprödung des Werkstückträgermaterials.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.
Zur Vermeidung dieses unerwünschten Verhaltens der Werkstückträger werden vermehrt Werkstückträger aus kohlenstofffaserverstärktem Kohlenstoff, kurz CFC (carbon fiber reinforced carbon) eingesetzt. Diese CFC-Werkstückträger weisen ein deutlich niedrigeres Gewicht als entsprechende metallische Werkstückträger auf. Das vergleichbare Trägersystem kann somit eine Mehrbeladung von 70 Prozent bezogen auf das Gewicht der auf dem Werkstückträger aufliegenden Werkstücke realisieren. Da die CFC-Werkstückträger verzugfrei sind, ist die punktgenaue Anordnung der Werkstücke gewährleistet. Schließlich ermöglicht diese punktgenaue Lagerung der Werkstücke ein automatisches Be- und Entladen der Gestelle durch entsprechende Spezialmanipulatoren. (
Um dies zu verhindern ist es bekannt, die Werkstückträger gitterartig auszubilden, so dass die Werkstücke lediglich auf den Gitterstreben aufliegen und im Bereich der Durchbrechungen im Gitter das Prozessgas problemlos mit dem Werkstück in Kontakt treten kann. Weiterhin ist es beispielsweise aus der
Ausgehend hiervon liegt der Erfindung die Aufgabe zugrunde, einen Werkstückträger so zu gestalten, dass die Prozessgase die Werkstückoberfläche gleichmäßig und gleichbleibend beaufschlagen.Based on this, 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.
Diese Aufgabe ist durch die Merkmalskombination des Anspruchs 1 in erfinderischer Weise gelöst. Die Unteransprüche beinhalten teilweise vorteilhafte und teilweise für sich selbst erfinderische Weiterbildungen dieser Erfindung.This task is solved in an inventive manner by the combination of features of
Die Erfindung beruht auf der Grundüberlegung, eine flächige Werkstückauflage eines Werkstückträgers insbesondere für ein Niederdruckaufkohlungsverfahren durch eine punktförmige Werkstückauflage zu substituieren. Gleichwohl liegt das Werkstück aufgrund der Vielzahl von Auflagepunkten auf einer nahezu geschlossenen Auflagefläche auf. Diese in sich geschlossene und gleichmäßige Auflage verhindert, dass sich das Werkstück während des Aufkohlens und / oder des Abkühlens verzieht oder durchbiegt.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.
Hierfür sind die ebenen beziehungsweise planen Aufnahmeflächen von rinnenförmigen Vertiefungen durchzogen. Die rinnenförmigen Vertiefungen bilden die Durchleitungen für das Prozessgas. Sie leiten das Prozeßgas zur Werkstückoberfläche hin. Das Prozessgas kann auf diese Weise in sämtliche Bereiche der Werkstückoberfläche diffundieren. Verschattungen an der Werkstückoberfläche treten somit nicht auf.For this purpose, 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.
Zugleich wird im Bereich der Vertiefungen der Flächenkontakt mit dem Werkstück beseitigt, so dass die gesamte wirksame Auflagefläche des Werkstückträgers reduziert wird. Da das Prozeßgas 100 % der Oberfläche des Werkstücks bei der Diffusion erreicht, ist die wirksame Diffusionsfläche des Werkstücks erheblich größer als die tatsächliche Auflagefläche des Werkstücks auf dem Werkstückträger.At the same time, surface contact with the workpiece is eliminated in the area of the recesses, so that the entire effective contact surface of the workpiece carrier is reduced. Since the process gas reaches 100% of the surface of the workpiece during diffusion, the effective diffusion area of the workpiece is significantly larger than the actual contact area of the workpiece on the workpiece carrier.
Die Vertiefungen reduzieren den Widerstand des Gasstroms während der Niederdruckaufkohlung und ermöglicht so ein schnelles und gleichmäßiges Abkühlen bei der anschließenden Hochdruckgasabschreckung.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.
Werden die Vertiefungen in sehr engen Abständen nebeneinander angebracht, wechseln relativ schmale Auflagebereiche sich mit den rinnenartigen Vertiefungen ab, so dass bezogen auf die Gesamtoberfläche des Werkstücks nur sehr geringe Teilbereiche der Werkstückoberfläche auf der Werkstückauflagefläche des Werkstückträgers aufliegen. Da aufliegende und nicht aufliegende Oberflächenbereiche des Werkstücks einander in kurzen Abständen abwechseln, erreicht das Prozessgas alle Oberflächenbereiche gut.If the depressions are placed next to each other at very close intervals, relatively narrow support areas alternate with the channel-like depressions so that, based on the total surface of the workpiece, only very small portions of the workpiece surface rest on the workpiece support surface of the workpiece carrier. Since the surface areas of the workpiece that are on and those that are not on the surface alternate at short intervals, the process gas reaches all surface areas easily.
Vorteilhaft werden die rinnenförmigen Vertiefungen so angeordnet, dass sie nicht parallel zueinander verlaufen, sondern in einem gewissen Winkel zueinander verlaufen, so dass sich die Vertiefungen überschneiden und zwischen sich Auflageflächeninseln mit relativ kleinen Oberflächen bilden.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.
Als besonders vorteilhaft hat es sich herausgestellt, die Werkstückauflagefläche mit rechtwinklig zueinander verlaufenden Vertiefungen zu versehen, so dass die Vertiefungen und die zwischen den Vertiefungen angeordneten Aufnahmepunkte ein Schachbrettmuster ergeben. Diese schachbrettmusterartige Anordnung ist besonders gleichmäßig. Zugleich ist die Verteilung des Prozessgases auf den Oberflächen der Werkstücke außergewöhnlich homogen. In Weiterbildung der schachbrettartigen Ausbildung ist es vorgesehen, die Aufnahmepunkte nach Art von Pyramidenstümpfen auszubilden. Hierbei sind verschiedene Höhen von Pyramidenstümpfen denkbar. Auch ist eine Ausgestaltung denkbar, bei der zunächst ein Pyramidenstumpf größerer Breite und Länge vorgesehen ist, auf welchen ein Pyramidenstumpf kleinerer Breite und Länge aufgesetzt ist. Zwischen beiden Pyramidenstümpfen ist auf diese Weise eine Stufe beziehungsweise ein Rücksprung gebildet. In weiterer Ausgestaltung ist es vorgesehen, die Aufnahmepunkte pyramidenförmig auszugestalten.It has proven to be particularly advantageous to provide 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. At the same time, the distribution of the process gas on the surfaces of the workpieces is exceptionally homogeneous. In a further development of the chessboard-like design, it is planned to design the recording points in the manner of truncated pyramids. Different heights of truncated pyramids are conceivable. 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. In a further embodiment, it is provided that the receiving points are designed in a pyramid shape.
Als vorteilhaft wird es weiterhin angesehen, den Werkstückträger gitterartig auszubilden. Bei dieser gitterartigen Ausbildung sind die von den rinnenförmigen Vertiefungen voneinander getrennten Aufnahmepunkte jeweils nur auf den Gitterstäben angeordnet.It is also considered advantageous to design the workpiece carrier in a grid-like manner. In this grid-like design, the receiving points separated from each other by the channel-shaped depressions are each arranged only on the grid bars.
Die Erfindung umfasst auch ein Chargiersystem mit mehreren entsprechend der Erfindung ausgestalteten, vorzugsweise übereinander angeordneten Werkstückträgern. Diese Werkstückträger sind ihrerseits vorteilhaft in einem Gestell übereinander angeordnet.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.
Anhand der in den Zeichnungsfiguren angeordneten Ausführungsbeispiele ist die Erfindung mit weiteren Einzelheiten erläutert. Es zeigen:
- Fig. 1
- eine Draufsicht auf einen erfindungsmäßigen Werkstückträger,
- Fig. 2
- das Detail II aus
Fig. 1 , - Fig. 3
- zwei nebeneinander angeordnete Ausführungsbeispiele von pyramidenstumpfförmig ausgestalteten Aufnahmepunkten,
- Fig. 4
- ein Ausführungsbeispiel mit Aufnahmepunkten mit gestufter Pyramidenstumpfform sowie
- Fig. 5
- eine Ausführung der Erfindung mit pyramidenförmigen Aufnahme-Punkten.
- Fig. 1
- a top view of a workpiece carrier according to the invention,
- Fig. 2
- the detail II
Fig. 1 , - Fig. 3
- two exemplary embodiments of truncated pyramid-shaped receiving points arranged next to each other,
- Fig. 4
- an embodiment with mounting points with a stepped truncated pyramid shape and
- Fig. 5
- an embodiment of the invention with pyramid-shaped recording points.
Der Werkstückträger 1 ist gitterartig aufgebaut. Die Längsstreben 2 und die zu den in Längsrichtung 8 verlaufenden Längsstreben 2 rechtwinklig verlaufenden Querstreben 3 bilden die eigentliche Werkstückauflagefläche des Werkstückträgers 1. Diese Werkstückauflagefläche ist eingerahmt von den Rahmenstreifen 4. Mit Hilfe der Rahmenstreifen 4 kann der Werkstückträger 1 beispielsweise in ein in den Zeichnungsfiguren nicht dargestelltes Gestell eingeschoben und von diesem Gestell gehalten werden. Schließlich ist jeder Eckbereich sowie das Zentrum des Werkstückträgers von einer Aufnahmebohrung 10 durchsetzt. In diese Aufnahmebohrungen 10 können in den Zeichnungsfiguren nicht dargestellte Bolzen eingeschoben oder eingeschraubt werden. In Verlängerung dieser Bolzen sind in den Zeichnungsfiguren wiederum nicht dargestellte Standfüsse, Stützfüsse oder anderweitig gestaltete Stützelemente ausgebildet, um die Werkstückträger 1 auf einer Fläche, beispielsweise dem Boden eines Hochtemperaturofens abstellen oder mehrere Werkstückträger 1 übereinander aufstapeln zu können. Sind die Stützelemente als Stützsäulen ausgestaltet, können mehrere Werkstückträger 1 auf diesen Säulen ruhend übereinander gestapelt sein und der Werkstückträgerstapel in einen Hochtemperaturofen eingeschoben werden. Die Stützelemente können also die Doppelfunktion von Abstandhaltern zwischen zwei Werkstückträgern 1 einerseits und von Standfüssen für die Werkstückträger andererseits erfüllen.The
In der Detaildarstellung der
Die
In der Darstellung der
Während mit Hilfe eines thermochemischen Vakuumprozesses behandelte Werkstücke nach dem Stand der Technik eine Oberflächenhärte im Intervall von 34 bis 58 HRC aufwiesen, haben Experimente mit der erfinderischen Ausgestaltung der Werkstückträger 1 ergeben, dass die Oberflächenhärte der Werkstücke in einem Intervall von 60 bis 64 HRC liegt. Die Härte der Werkstückoberflächen ist damit nicht nur signifikant gesteigert worden sondern liegt auch in einem sehr viel schmaleren Intervall als beim Stand der Technik. Dies bedeutet, dass mit den erfindungsmäßigen Werkstückträgern 1 Werkstücke mit einer nahezu gleichmäßigen homogenen Oberflächengüte hergestellt werden können.While workpieces treated with the aid of a thermochemical vacuum process according to the prior art had a surface hardness in the interval of 34 to 58 HRC, experiments with the inventive design of the
Der gitterartige Aufbau des Werkstückträgers 1 gemäß
- 11
- WerkstückträgerWorkpiece carrier
- 22
- LängsstrebeLongitudinal strut
- 33
- QuerstrebeCross brace
- 44
- RahmenstreifenFrame strips
- 55
- Vertiefungdeepening
- 66
- AufnahmepunktRecording point
- 77
- DurchbrechungBreakthrough
- 88th
- LängsrichtungLongitudinal direction
- 99
- QuerrichtungTransverse direction
- 1010
- Aufnahmebohrunglocation hole
Claims (7)
- A workpiece carrier (1) formed from a carbon-fibre-reinforced carbon and having a planar workpiece support face, wherein the workpiece support face is penetrated by channel-like indentations (5), and wherein the channel-like indentations (5) form the passages for a process gas.
- The workpiece carrier (1) according to claim 1, characterised in that the indentations (5) intersect with one another and divide the workpiece support face into a plurality of adjacently arranged receiving points (6).
- The workpiece carrier (1) according to claim 1 or 2, characterised in that a plurality of indentations (5) run in the longitudinal direction (8) and further indentations (5) run in the transverse direction (9), in such a way that the receiving points (6) are arranged adjacently in the form of squares of a checkerboard pattern.
- The workpiece carrier (1) according to any one of claims 1 to 3, characterised by receiving points (6) in the form of pyramid frustums.
- The workpiece carrier (1) according to claim 4, characterised by receiving points (6) in the form of pyramid frustums, consisting of a pyramid frustum of greater length and width as base and, placed thereon, a second pyramid frustum of shorter length and width.
- The workpiece carrier (1) according to any one of claims 1 to 5, characterised by a grid-like workpiece support face with multiple openings (7).
- A charging system for a vacuum system comprising a plurality of workpiece carriers (1) according to any one of claims 1 to 6 arranged one above the other.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE202015104929 | 2015-09-16 |
Publications (2)
Publication Number | Publication Date |
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EP3144622A1 EP3144622A1 (en) | 2017-03-22 |
EP3144622B1 true EP3144622B1 (en) | 2023-11-01 |
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Family Applications (1)
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EP16188891.2A Active EP3144622B1 (en) | 2015-09-16 | 2016-09-15 | Workpiece carrier |
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EP (1) | EP3144622B1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102018101994A1 (en) * | 2018-01-30 | 2019-08-01 | Ald Vacuum Technologies Gmbh | Device for supporting metallic workpieces and method for thermochemical treatment |
DE102020123322A1 (en) * | 2020-09-07 | 2022-03-10 | Ald Vacuum Technologies Gmbh | Fluid guidance for quenching metallic workpieces |
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US3314666A (en) * | 1964-11-10 | 1967-04-18 | Cyprus Mines Corp | Fast fire tunnel kiln |
DE19651408C2 (en) * | 1996-12-11 | 2001-04-19 | Fraunhofer Ges Forschung | Workpiece carrier for heat treatment of workpieces and use of the workpiece carrier |
DE10312802B3 (en) * | 2003-03-21 | 2004-07-22 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Workpiece carrier in heat resistant fiber bonded ceramic material with a workpiece reception region and a segmented distancing device useful for heat treatment of workpieces |
DE20319600U1 (en) * | 2003-12-17 | 2004-03-18 | Sgl Carbon Ag | Workpiece support made from fibre reinforced ceramic, used for thermal treatment of metal goods, has workpiece holders releasably secured to base plate |
DE102006004902A1 (en) * | 2005-02-02 | 2006-08-24 | Gtd Graphit Technologie Gmbh | Carbon fibre composite grille used as charge support frame in vacuum furnaces, has feet containing reinforcing fibres extending parallel to bottom side of grille |
CN101960245A (en) * | 2008-03-05 | 2011-01-26 | 日本碍子株式会社 | Kiln tool plate for firing ceramic |
JP5972831B2 (en) * | 2013-06-06 | 2016-08-17 | 東洋炭素株式会社 | Heat treatment furnace jig |
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