EP1685355A2 - Anlage und verfahren zum wärmebehandeln von werkstücken - Google Patents
Anlage und verfahren zum wärmebehandeln von werkstückenInfo
- Publication number
- EP1685355A2 EP1685355A2 EP04818802A EP04818802A EP1685355A2 EP 1685355 A2 EP1685355 A2 EP 1685355A2 EP 04818802 A EP04818802 A EP 04818802A EP 04818802 A EP04818802 A EP 04818802A EP 1685355 A2 EP1685355 A2 EP 1685355A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- workpieces
- places
- opening
- furnace
- rotary hearth
- 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.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
- F27B9/16—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a circular or arcuate path
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
Definitions
- the invention relates to a system for the heat treatment of workpieces with a rotary hearth furnace which can be rotated in cycles and has an outer and an inner wall which delimit an oven space, with doors which divide the oven space into several treatment zones, with a first and a second closable opening for loading or unloading, the openings being arranged in the outer wall and each opening being associated with a transport device for the workpieces and a quenching device.
- the invention further relates to a method for operating the system for heat treating workpieces.
- Such a system which is known from WO 03/081156 A1 and is used for hardening workpieces, has two closable openings for loading and unloading in an outer wall.
- a first opening is preceded by a first quenching device in the form of a hardening press and a second opening is preceded by a second quenching device in the form of a quenching bath.
- the latter is connected directly to the rotary hearth furnace by means of a lock.
- the first opening is assigned a first transport device in the form of an impact device and the second opening is assigned a second transport device in the form of a loading robot or manipulator.
- the workpieces are heated in the rotary hearth furnace in several treatment zones, carburized and quenched in one of the quenching devices.
- the hardened workpieces are then transported on a roller conveyor and into a washer and tempering furnace, in which the workpieces are relieved of tension due to moderate heating.
- the rotary hearth furnace can be used for heating and carburizing first workpieces, which are individually quenched in the first quenching device in the form of a hardening machine or hardening press.
- the rotary hearth furnace can alternatively be used for heating and carburizing second workpieces that are freely quenched in quenching baths and that are packed into batches that are located on batch carriers, e.g. B. gratings or in baskets or similar containers.
- batch carriers e.g. B. gratings or in baskets or similar containers.
- an embodiment of the known system has the disadvantage that the furnace space, which is located in the direction of rotation between the two openings, cannot be used for the heat treatment.
- the object of the invention is accordingly to develop a system of the type mentioned at the outset in such a way that the simultaneous heat treatment of different types of workpieces is made possible.
- the rotary hearth is divided in the direction of rotation into several defined first places for first workpieces and second places for second workpieces, the first and second places alternating, with at least one treatment zone extending between the openings in the direction of rotation, the number of places in this treatment zone is an integral multiple of two and the length of a conveying stroke corresponds to the length of at least two places.
- Each workpiece that is placed in the annular furnace space passes through it completely and is removed through the same opening.
- the length of each treatment zone must be at least two places or an integer multiple of two, for example four, six or eight, for two different workpiece types.
- a third opening is arranged in the outer wall, the third opening being associated with a transport device for the workpieces and a quenching device, the rotary hearth rotating in the direction of rotation into several defined first places for first workpieces, second places for second workpieces and third places for third workpieces divided, the first, second and third places alternating, with at least one treatment zone extending between the openings in the direction of rotation, the number of places in the treatment zone being an integral multiple of three and the length of a conveying stroke Corresponds to a length of at least three places.
- the first places are preferably provided with internals which are designed for heat storage and whose carbon activity is essentially equal to 1.
- the heat capacity is at least 1.5 times the heat capacity of the first workpieces. If these internals remain in the furnace chamber at all times, they can store heat that can be given off to the cold workpieces as soon as they are introduced into the furnace chamber.
- the internals thus serve as secondary radiators, which cause the workpieces to be heated up quickly and which reduce the cycle time. At the same time, the availability of carbon is not reduced because no carbon or soot fails on the heated internals.
- the internals are made of high-temperature-resistant ceramic, in particular SIC or or carbon fiber amplifier ceramic. Ceramic has a low coefficient of expansion so that the internals do not warp.
- the invention is further characterized in that a quenching device in the form of a quenching bath is assigned to the second and / or the third opening, the quenching bath being directly connected by means of a heatable lock which is designed for the intermediate storage of workpieces and which is designed for the intermediate storage of workpieces is connected to the rotary oven.
- a quenching device in the form of a quenching bath is assigned to the second and / or the third opening, the quenching bath being directly connected by means of a heatable lock which is designed for the intermediate storage of workpieces and which is designed for the intermediate storage of workpieces is connected to the rotary oven.
- the invention offers the advantageous possibility that the quenching devices are followed by a common tempering furnace, each of which has a path for the first, second or possibly third workpieces.
- the invention also provides a method, characterized in that a workpiece is introduced and discharged into the furnace space through each opening in each cycle and that at least one treatment zone extends between the openings in the direction of rotation, in which a heat exchange between the first, second, takes place during the heat treatment and possibly third workpieces.
- Figure 1 is a schematic plan view of a first embodiment of a plant for heat treatment.
- Fig. 1 The plant shown schematically in Fig. 1 is used for case hardening, i. H. Gas carburizing and hardening of various workpieces, for example ring gears, which are quenched in a hardening press and drive bevel gears, which are freely quenched in a quenching bath, are used.
- case hardening i. H. Gas carburizing and hardening of various workpieces, for example ring gears, which are quenched in a hardening press and drive bevel gears, which are freely quenched in a quenching bath, are used.
- the system for the heat treatment of workpieces has a rotary hearth furnace 1 which has a rotary hearth 2 which can be rotated in cycles and an outer and inner wall 3a, b which delimit an oven space 4 which is divided into a plurality of treatment zones 6a-d by means of vertically movable doors 5af ,
- first closable opening 7 for loading and unloading several first workpieces, here ring gears, which are individually quenched in a hardening press.
- the first opening 7 is assigned a first transport device 9 in the form of a loading robot or manipulator, with the aid of which the first workpieces are transported into and out of the furnace chamber 4.
- the first opening 7 is preceded by a first quenching device 10 in the form of a hardening machine or hardening press, in which the first workpieces are quenched individually.
- second opening 11 at a distance from the first opening 7, for loading and unloading second workpieces, here drive bevel gears.
- the second opening 11 is preceded by a second quenching device in the form of a quenching bath 13.
- the latter is connected directly to the rotary hearth furnace 1 by means of a lock 14.
- the second opening 11 is assigned a second transport device 15 in the form of an impact device.
- the lock 14 is heated and designed so that a batch or a grate can be temporarily stored in the lock.
- the second workpieces 12 are quenched freely in the quenching bath and are packed into batches which are located on batch carriers, eg. B. gratings or in baskets or similar containers.
- the rotary hearth 2 of the rotary hearth furnace 1 can be rotated in cycles.
- the rotary hearth only moves in one direction, here counterclockwise.
- First places 8 for several first workpieces and second places 12 for several second workpieces 12 alternate in the direction of rotation.
- the entire rotary hearth is thus divided into first places 8 and second places 12.
- two places ie. H. a first place 8 with first workpieces and a second place 12 with second workpieces.
- the length of a conveyor stroke thus corresponds to two places. This ensures that a first workpiece 8 always arrives in front of the first opening 7 and thus in front of the first quenching device and at the same time second workpieces 12 arrive in front of the second opening 11 and accordingly in front of the second quenching device.
- each workpiece that is placed in the annular furnace space passes through it completely and is removed through the same opening.
- the length of each treatment zone must be at least two places or an integer multiple of two, for example four or six.
- each treatment zone must be at least three places or an integer multiple of three, for example six or nine.
- the treatment zones 6a-d each have defined temperatures and treatment atmospheres. In the carburizing process, the workpieces in the treatment zones are heated in a known manner, with a mass transfer taking place. Before removal, ie in the last treatment zone, the workpieces are cooled to the hardening temperature. In the last treatment zone, the carbon level is 0.7% to 0.8% in order to achieve a marginal carbon content in the workpieces at the same level.
- first places are provided with internals (not shown in detail) which are designed for heat storage.
- the fittings have a large heat storage mass and in relation to the first
- the internals preferably consist of high-temperature resistant ceramic.
- the internals can also be used to store the workpieces.
- the internals are designed as frames with a plurality of shelves arranged one above the other for receiving workpieces. These frames form stackable modules that have closed walls and floors.
- the first workpieces are individually stored on the frames.
- the individual workpieces can also be located on support elements. These are, for example, gratings made of heat-resistant steel, on which the workpieces are loaded and unloaded.
- the individual modules form a single free-standing batch of batches so that the furnace zones can be separated from one another by the intermediate doors. If the batch stacks are installed in niches in the furnace lining, there is a simple additional separation of the furnace zones.
- the workpieces which are introduced through an opening in the furnace chamber, pass through this completely and are removed through the same opening.
- the length of each treatment zone must be at least two at least two places or an integer multiple of two, for example four or six. If three different workpiece types are heat-treated at the same time, the length of a treatment zone must be at least three places or an integral multiple of three, for example six or nine.
- a treatment zone 6a is located in the direction of rotation between the two openings 7 and 11 of the rotary hearth furnace 1. This acts as the first treatment zone for the first workpieces 8 and at the same time as the last treatment zone for the second workpieces 12 before the latter leave the furnace chamber through the opening 11.
- heat is exchanged between the different workpieces in the first and second places.
- Heat-storing internals in the places for the first workpieces act as secondary radiators that radiate heat. In this way, simultaneous heat treatment of different types of workpieces is made possible in a single rotary hearth furnace, cycle times are increased and the furnace space is optimally used.
- the workpieces are quenched in one of the quenching devices. After quenching, the workpieces are conveyed on roller conveyors 16a, b and each pass into a washer 17a, b and a common tempering furnace 18, in which the first and second workpieces are relieved of tension due to moderate heating.
- the tempering furnace 18 each has a path 19a, b for the first and the second workpieces.
- the loading and unloading of the batches and the individual parts takes place according to type via the separate roller conveyors 16a, 16b.
- the length of a conveyor stroke corresponds to three places to ensure that all workpieces arrive in front of the opening through which they entered the furnace.
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10354138 | 2003-11-19 | ||
PCT/EP2004/013102 WO2005050112A2 (de) | 2003-11-19 | 2004-11-18 | Anlage und verfahren zum wärmebehandeln von werkstücken |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1685355A2 true EP1685355A2 (de) | 2006-08-02 |
EP1685355B1 EP1685355B1 (de) | 2011-04-06 |
Family
ID=34609134
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04818802A Not-in-force EP1685355B1 (de) | 2003-11-19 | 2004-11-18 | Anlage und verfahren zum wärmebehandeln von verschiedenartigen werkstücken |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1685355B1 (de) |
AT (1) | ATE504792T1 (de) |
DE (2) | DE502004012382D1 (de) |
WO (1) | WO2005050112A2 (de) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007048041A1 (de) * | 2007-10-05 | 2009-04-09 | Loi Thermprocess Gmbh | Drehherdofen |
DE102008006682A1 (de) * | 2008-01-30 | 2009-08-13 | Schuler Smg Gmbh & Co. Kg | Drehofen |
PL2685193T3 (pl) * | 2012-07-11 | 2015-05-29 | Loi Thermprocess Gmbh | Sposób oraz piec karuzelowy do obróbki cieplnej elementów obrabianych |
CN103276165B (zh) * | 2013-06-07 | 2016-09-07 | 鞍钢股份有限公司 | 一种环形炉节能操作方法 |
DE102014004398A1 (de) * | 2014-03-18 | 2015-09-24 | Schuler Pressen Gmbh | Drehofen |
JP6900695B2 (ja) * | 2017-02-09 | 2021-07-07 | 住友金属鉱山株式会社 | 金属酸化物の製錬方法 |
CN108775817A (zh) * | 2018-07-27 | 2018-11-09 | 江苏凤谷节能科技有限公司 | 一种基于ω型回转窑和环形炉组合烧结粉体材料的方法 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3209245A1 (de) * | 1982-03-13 | 1983-09-15 | Brown, Boveri & Cie Ag, 6800 Mannheim | Drehherdofen |
DE3427716C1 (de) * | 1984-07-27 | 1985-11-14 | Daimler-Benz Ag, 7000 Stuttgart | Drehherdofen in Ringbauart zur Waermebehandlung von Werkstuecken |
DE29716221U1 (de) * | 1996-09-04 | 1997-11-20 | Iob Ind Ofen Bau Gmbh | Glühofen zur Wärmebehandlung metallischer Werkstücke |
DE10310739A1 (de) * | 2002-03-27 | 2003-10-09 | Loi Thermprocess Gmbh | Anlage zum Wärmebehandeln von Werkstücken |
-
2004
- 2004-11-18 EP EP04818802A patent/EP1685355B1/de not_active Not-in-force
- 2004-11-18 AT AT04818802T patent/ATE504792T1/de active
- 2004-11-18 DE DE502004012382T patent/DE502004012382D1/de active Active
- 2004-11-18 WO PCT/EP2004/013102 patent/WO2005050112A2/de active Application Filing
- 2004-11-18 DE DE102004055808A patent/DE102004055808A1/de not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO2005050112A3 * |
Also Published As
Publication number | Publication date |
---|---|
EP1685355B1 (de) | 2011-04-06 |
DE102004055808A1 (de) | 2005-06-23 |
ATE504792T1 (de) | 2011-04-15 |
DE502004012382D1 (de) | 2011-05-19 |
WO2005050112A2 (de) | 2005-06-02 |
WO2005050112A3 (de) | 2005-08-04 |
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