WO1991003576A1 - Procede et dispositif de chauffage auxiliaire d'une piece forgee - Google Patents

Procede et dispositif de chauffage auxiliaire d'une piece forgee Download PDF

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Publication number
WO1991003576A1
WO1991003576A1 PCT/EP1990/001449 EP9001449W WO9103576A1 WO 1991003576 A1 WO1991003576 A1 WO 1991003576A1 EP 9001449 W EP9001449 W EP 9001449W WO 9103576 A1 WO9103576 A1 WO 9103576A1
Authority
WO
WIPO (PCT)
Prior art keywords
intermediate heating
forging
manipulator
furnace
press
Prior art date
Application number
PCT/EP1990/001449
Other languages
German (de)
English (en)
Inventor
Timothy Thexton
Original Assignee
Aga Ab
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 Aga Ab filed Critical Aga Ab
Publication of WO1991003576A1 publication Critical patent/WO1991003576A1/fr

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Classifications

    • 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
    • C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J17/00—Forge furnaces

Definitions

  • the invention relates to a method and an arrangement for intermediate heating of a forging held in the forging press or in the hammer by a manipulator.
  • the workpieces are brought to the processing temperature in the deep furnace, pusher furnace or forging furnace.
  • the temperature inside the workpiece is retained due to the deformation work; however, the temperature of exposed external areas can drop so far that they are at risk of cracking. Intermediate heating is therefore necessary.
  • the forgings are transported back to the pusher furnace or forging furnace according to previous practice. Since these furnaces are large and heavy systems that are operated continuously and are usually not in the immediate vicinity of the forging presses or hammers, transport is necessary, which is both important Means of transport and the transport time is expensive and gives rise to heat loss and scaling. Only in the handicraft business when treating small workpieces can the forging hammer and the forging furnace be provided at such a short distance from one another that these disadvantages are negligible.
  • the invention relates O 91/03576 PCT / EP90 / 01449
  • the invention is based on the object of creating a method and an arrangement for the intermediate heating of large forgings held by a manipulator, which is less complex and lossy.
  • the solution according to the invention consists of two groups of features.
  • the first group of features relates to the fact that the forging remains in the manipulator during intermediate heating and transport, which holds it in the forging press or hammer. This eliminates the need to move the forgings and the need to use separate transport systems. This also has an impact on the construction costs of the intermediate heating furnace, since it does not have any heavy equipment to carry and, if necessary, Moving the forging is required. Rather, the workpiece is held in the intermediate heating furnace by the manipulator and even moved, if necessary, for the purpose of uniform heat distribution, for example rotated.
  • the second group of features relates to the intermediate heating furnace, which, thanks to the manipulator's continued holding of the forging, can be constructed very easily and practically only needs to consist of a burner suitably arranged in a battery. Not even an oven housing is required, although generally useful.
  • This allows the intermediate heating furnace to be arranged in the immediate vicinity of the press or hammer. It can also be designed to be mobile so that it can be used at different locations as required. Its light design also makes it possible to adapt its burner arrangement to the respective requirements, for example the forging receptacle
  • the level of invention is based on the one hand on the interlocking of the two different groups of features. Thanks to the continuous holding of the forging in the manipulator, the intermediate heating furnace can be made so light and adaptable that it can be arranged in the immediate vicinity of the press or hammer. Thanks to this lightweight construction, it is possible to provide it in addition to the otherwise available, stationary and continuously operated deep-forging and forging furnaces as well as possibly in larger numbers and to operate it discontinuously.
  • the amount of invention is based on thermal and thermal considerations.
  • the enormous energy requirement of the furnaces required in connection with the forging operation makes it necessary to operate them as economically as possible and to pay particular attention to the possibility of heat recovery (for example by recuperation, combustion air preheating, etc.).
  • they must be constructed in such a way that the workpieces find uniform temperature and heat transfer conditions on all sides so that they reach the required uniform temperature.
  • These two principles which have been regarded as indispensable by the prior art, are disregarded by the invention.
  • Neither a light, discontinuously switchable furnace can be operated economically by heat recovery.
  • the burners arranged around the workpiece receiving space at a short distance from the workpiece can still guarantee uniform heat transfer and temperature conditions. Rather, it must be expected that higher temperature and higher gas velocities with correspondingly higher heat transfer rates will prevail further outside, in closer proximity to the burners, than in areas of the workpiece receiving space located further inside.
  • the invention has surprisingly recognized that, contrary to the principles that have been valid up to now, the invention has considerable advantages.
  • the heat losses can be considerably reduced by eliminating longer transport times between the press or hammer and pusher furnace.
  • the scale losses are correspondingly lower.
  • the energy used during the operation of the intermediate heating furnace according to the invention is not as economical as in a pusher furnace; however, this disadvantage is due, on the one hand, to the avoidance of the transport heat losses, on the other hand to the strict concentration of the use of energy on the discontinuous intermediate heating periods and finally to the concentration of the pusher furnace operation on the initially continuously predictable heating of the forgings far balanced.
  • the unequal temperature and heat transfer ratios over the diameter of the forging piece holder of the intermediate heating furnace to be used according to the invention are to be regarded as an advantage, contrary to previous assumptions.
  • the supposed disadvantage of the furnace to be used according to the invention thus turns out to be an advantage because the heat emission conditions in the forging press or hammer are essentially inversely represented as heat absorption conditions in the furnace. It also makes it possible to work with higher burner temperatures than are permitted in a pusher furnace.
  • the invention is particularly suitable for forgings of compact cross-sectional shape, i.e. a cross-sectional shape whose dimensions measured in different directions do not differ significantly from one another.
  • Fig. 1 shows a longitudinal section through an intermediate heating furnace
  • Fig. 2 is an end view of the furnace.
  • the furnace housing 1 is closed on the circumference and on one end side and forms an opening 2 on the other end side, which leads to the forging-receiving space 3, the circumference of which is predefined by gas burners 4, which are preferably uniformly distributed and which are expediently External mixing burner is concerned, the flames 5 of which are directed onto the surface 6 of the forging 7, while this is held in the receptacle 3 by the magnetic pulley 8 and rotated for the purpose of more uniform heat distribution.
  • the burner arrangement and thus the dimension and shape of the forging receiving space can be changed as desired and in particular adapted to different forging shapes.
  • a closed housing can often be dispensed with.
  • the burners 4 can be adjusted, for example, in the direction of the arrow 9 to adapt to different diameters of the forging.
  • the forging 7 to be heated is brought to the intermediate heating furnace by means of the manipulator 8 and inserted approximately centrally in its forging-receiving space 3. Shortly before or after, the burners 4 are switched on. The workpiece is heated and removed again. The burners are switched off.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Forging (AREA)

Abstract

Procédé et dispositif de chauffage auxiliaire d'une pièce forgée (7) maintenue, par un manipulateur (8), dans une presse à forger ou un marteau-pilon. Pour réduire les durées de transport, les pertes de chaleur et le calaminage, il est prévu, à proximité de la presse ou du marteau-pilon, un four de chauffage auxiliaire (1) d'une construction légère, présentant un brûleur à gaz (4) agencé autour d'un espace de réception (3) de la pièce forgée et configuré pour un service de courte durée du brûleur. La pièce forgée (7) peut être amenée, en cas de besoin, rapidement dans le four de chauffage auxiliaire (1), où elle est maintenue par le manipulateur (8) et, le cas échéant, entraînée en rotation, ce qui assure une répartition uniforme de la chaleur.
PCT/EP1990/001449 1989-09-07 1990-08-30 Procede et dispositif de chauffage auxiliaire d'une piece forgee WO1991003576A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19893929754 DE3929754A1 (de) 1989-09-07 1989-09-07 Verfahren und anordnung zum zwischenwaermen eines schmiedestuecks
DEP3929754.3 1989-09-07

Publications (1)

Publication Number Publication Date
WO1991003576A1 true WO1991003576A1 (fr) 1991-03-21

Family

ID=6388836

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1990/001449 WO1991003576A1 (fr) 1989-09-07 1990-08-30 Procede et dispositif de chauffage auxiliaire d'une piece forgee

Country Status (2)

Country Link
DE (1) DE3929754A1 (fr)
WO (1) WO1991003576A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102717023A (zh) * 2012-06-28 2012-10-10 江苏金源锻造股份有限公司 一种天然气加热炉
CN107838362A (zh) * 2017-11-10 2018-03-27 苏州昆仑重型装备制造有限公司 模具补温电阻炉

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1061294A (fr) * 1951-08-13 1954-04-12 United States Steel Corp Procédé de chauffage de lingots d'acier en vue du forgeage ou de l'extrusion
FR1125979A (fr) * 1955-05-06 1956-11-12 Rampe de chauffage
FR74242E (fr) * 1958-10-03 1960-11-07 Four de forge
US3334879A (en) * 1964-01-16 1967-08-08 Sievert App R Ab Combination furnace and forge
JPS58174526A (ja) * 1982-04-06 1983-10-13 Daido Steel Co Ltd 鋳片の端部加熱装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1061294A (fr) * 1951-08-13 1954-04-12 United States Steel Corp Procédé de chauffage de lingots d'acier en vue du forgeage ou de l'extrusion
FR1125979A (fr) * 1955-05-06 1956-11-12 Rampe de chauffage
FR74242E (fr) * 1958-10-03 1960-11-07 Four de forge
US3334879A (en) * 1964-01-16 1967-08-08 Sievert App R Ab Combination furnace and forge
JPS58174526A (ja) * 1982-04-06 1983-10-13 Daido Steel Co Ltd 鋳片の端部加熱装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Vol. 8, No. 7 (C-204) (1444), 12. January 1984, & JP, A, 58174526 (Daido Tokushuko K.K.) 13. Oktober 1983 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102717023A (zh) * 2012-06-28 2012-10-10 江苏金源锻造股份有限公司 一种天然气加热炉
CN107838362A (zh) * 2017-11-10 2018-03-27 苏州昆仑重型装备制造有限公司 模具补温电阻炉

Also Published As

Publication number Publication date
DE3929754A1 (de) 1991-03-14

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