WO1995014111A1 - Facility for the heat treatment of metal parts, especially parts made of zinc-containing non-ferrous metals - Google Patents
Facility for the heat treatment of metal parts, especially parts made of zinc-containing non-ferrous metals Download PDFInfo
- Publication number
- WO1995014111A1 WO1995014111A1 PCT/EP1994/003819 EP9403819W WO9514111A1 WO 1995014111 A1 WO1995014111 A1 WO 1995014111A1 EP 9403819 W EP9403819 W EP 9403819W WO 9514111 A1 WO9514111 A1 WO 9514111A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- channel
- cold trap
- heated
- section
- zinc
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/02—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working in inert or controlled atmosphere or vacuum
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
- C21D1/767—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material with forced gas circulation; Reheating thereof
-
- 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
-
- 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
- C21D9/0043—Muffle furnaces; Retort furnaces
Definitions
- the invention is based on a system for heat treatment of small metal parts with the features specified in the preamble of claim 1.
- a system is known from DE-GM 91 00 289.
- the known system has a horizontal channel that is heated over most of its length.
- An endless conveyor belt runs through the channel, for example a metal link belt, which is deflected downwards at the end of the channel and is returned to the entrance of the channel through a cooling bath.
- the conveyor belt runs a bit in front of the entrance to the canal on a horizontal surface; here the small parts are placed on the belt.
- the small parts in the known system fall into a quenching bath; however, it is also known to have a non-heated channel connected to the heated section of the channel outside the furnace, during which the small parts cool more slowly than if they fall into a quenching bath.
- the canal the heated section of which is often called
- Retort contains an atmosphere adapted to the goal of heat treatment, e.g. Hydrogen or nitrogen.
- An atmosphere of pure hydrogen is preferably used for bright annealing in order to achieve a low-oxide surface.
- Zinc has a low melting point (420 ° C), a low boiling point (907 ° C) and a relatively high vapor pressure even at the melting point.
- a low melting point 420 ° C
- a low boiling point 907 ° C
- a relatively high vapor pressure even at the melting point.
- the zinc vapor Precipitation initially makes bare surfaces gradually blind, which is particularly annoying when the parts are to be brightly annealed. It is therefore known to subsequently chemically pickle metal parts that have become blind through heat treatment in order to remove the zinc deposit and to obtain a bare surface again.
- the subsequent pickling is not only an additional complex process, but also brings with it environmental problems, because strong acids are used and the pickling baths have to be enriched with zinc and disposed of in an environmentally friendly manner.
- Another disadvantage is that the retort in which the heat treatment takes place has to be laboriously cleaned from time to time in order to remove the zinc vapor deposit.
- the present invention has for its object to show a way how the problems with the zinc vapors escaping from zinc-containing non-ferrous metals can be reduced during bright annealing.
- the cold trap is in flow connection with the channel, so that the zinc vapors are conducted to the cold trap with the flow from the hot channel.
- the zinc vapor is sucked out of the hottest part of the channel and accordingly, from the hottest part of the canal. »Branching line led to a cold trap outside the channel. In this way, the zinc vapors are detected where they are most likely to be generated.
- the shielding gas extracted from the hot section of the duct is returned to the duct after flowing through the cold trap via a return line, but preferably not to the heated one Section, because there it would lower the furnace temperature, but in front of the heated section of the channel, so that it is heated together with the small parts entering the heated section, or behind the heated section of the channel, where the small parts cooled down again become; if a cooling duct is connected to the heated section of the duct, in which the small parts are cooled under protective gas, d: - "the recycled protective gas is expediently introduced ;, .-- into the cooling duct, especially at the beginning.
- the effect of the extraction is particularly favorable if it takes place at several points in the channel, for example once in the first section of the channel, the protective gas extracted from there being able to be returned to the area in front of the heated section, and once more in the second half of the heated section of the channel, from where the extracted protective gas is preferably returned to the subsequent channel, which may be used for cooling.
- a cold trap itself is particularly suitable for an elongated container filled with packing elements, through which flow flows longitudinally from one end to the other end, the zinc vapor being able to precipitate on the packing elements.
- Suitable fillers are fillers which are known in chemical process engineering, for example Raschig rings.
- the cold trap does not have to be particularly cold. It suffices if the temperature of the cold trap falls below the temperature at which the interfering metal vapor condenses and solidifies. It is even undesirable to cool the cold trap too deeply in order not to get a temperature drop in the retort and to keep the energy consumption low.
- a temperature between 200 ° C and 350 ° C in the cold trap is well suited for the separation of zinc vapors.
- the fillers are replaced from time to time and can be subjected to recycling in order to recover the zinc deposited on them in crystalline form.
- FIG. 1 An embodiment of the invention is shown schematically in the accompanying drawing.
- the drawing shows a longitudinal section through a heat treatment furnace, through which the small parts to be treated pass.
- a heat treatment furnace There is a in the oven Elongated channel 1, also called a retort, which is surrounded by furnace insulation 2 over most of its length.
- a heating device 3 is attached, which is preferably equipped with electrical
- Heating elements works; but a gas heater could also be used.
- An endless conveyor belt runs through channel 1, on which the small parts pass through the channel.
- the channel leads out of the furnace insulation 2 at both ends.
- a cold section la of the channel lying in front of the furnace serves to feed the small parts.
- a section 1b of the channel running behind the furnace serves for the controlled cooling of the small parts under the same protective gas which is also used in the heated section 1c of the channel, and is surrounded by a cooling jacket 5 for this purpose.
- two lines 6 and 7 branch off towards the top and each open into a retort attachment 8 or 9, in which an elongated, cylindrical container 10 or 11 is immersed from above, which is attached to it lower end has a perforated bottom 12.
- the retort attachments 8 and 9 are closed by a cover 13 through which the containers 10 and 11 are passed gas-tight.
- the containers 10 and 11 are also closed by a cover 14, through which a tube 15, 16 is introduced concentrically to the container 10 and 11, respectively.
- the pipes 15 and 16 are on their closed bottom end.
- a tubular lance 17 and 18 leads from above into the tubes 15 and 16, which opens shortly before the lower end of the outer tube 15 and 16, respectively. Cooling air is blown in through the lances 17 and 18, which rises in the annular space between the lance and the outer tube 15 or 16 and cools the annular space between the outer tube 15, 16 and the container 10 or 11, which is filled with fillers 19 , for example filled with Raschig rings.
- One retort attachment 8 ' is assigned to the first half of the heated section 1c of the channel. From it, a return line 20 starting from the cover 14, in which a pump 21 is located, leads back into the cold section 1 a of the channel lying in front of the furnace.
- the second retort attachment 9 is assigned to the second half of the heated section 1c of the channel. From there, too, starting from the cover 14, a second return line 22, in which a pump 23 is located, leads back to the channel 1, but this time to the section 1b emerging from the furnace, namely at the beginning of the cooling jacket 5.
- the heat-treated small parts leave the hot section 1c of the channel bare and can be cooled in section 1b in a controlled manner under protective gas, so that the bare surface is retained.
- Hydrogen is preferred as the protective gas, which at most contains negligible proportions of gases which interfere with bright annealing, such as water vapor or CO.
- the hydrogen does not diffuse through the wall of the retort, it is not made of ceramic, but preferably of metal.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Crystallography & Structural Chemistry (AREA)
- Thermal Sciences (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
- Furnace Details (AREA)
- Tunnel Furnaces (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP95901393A EP0729519A1 (en) | 1993-11-18 | 1994-11-18 | Facility for the heat treatment of metal parts, especially parts made of zinc-containing non-ferrous metals |
FI962113A FI107453B (en) | 1993-11-18 | 1996-05-17 | Plant for heat treatment of metallic parts, especially of non-ferrous metals containing zinc |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19934339315 DE4339315A1 (en) | 1993-11-18 | 1993-11-18 | Plant for the heat treatment of small parts made of metal, in particular of non-ferrous metals containing zinc |
DEP4339315.2 | 1993-11-18 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1995014111A1 true WO1995014111A1 (en) | 1995-05-26 |
Family
ID=6502853
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1994/003819 WO1995014111A1 (en) | 1993-11-18 | 1994-11-18 | Facility for the heat treatment of metal parts, especially parts made of zinc-containing non-ferrous metals |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0729519A1 (en) |
CZ (1) | CZ288760B6 (en) |
DE (1) | DE4339315A1 (en) |
FI (1) | FI107453B (en) |
WO (1) | WO1995014111A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ATE270714T1 (en) * | 1999-08-18 | 2004-07-15 | Patherm Sa | DEVICE FOR CONTINUOUS HEAT TREATMENT OF METAL WORKPIECES, INDIVIDUALLY OR IN GROUP |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
LU36453A1 (en) * | ||||
US3035824A (en) * | 1960-02-24 | 1962-05-22 | Midland Ross Corp | Furnace with cooled and recirculated atmosphere |
FR2397611A1 (en) * | 1977-07-12 | 1979-02-09 | Mat Thermique Moder Const | THERMAL TREATMENT OVEN |
FR2477900A1 (en) * | 1980-03-14 | 1981-09-18 | Heurtey Metallurgie | METHOD AND DEVICE FOR SEPARATING GASEOUS ATMOSPHERES IN ATMOSPHERE HEAT TREATMENT PLANTS |
DE9100289U1 (en) * | 1990-01-20 | 1991-04-04 | Wolfgang Kohnle Waermebehandlungsanlagen Gmbh, 7534 Birkenfeld, De | |
JPH03240938A (en) * | 1990-02-16 | 1991-10-28 | Furukawa Electric Co Ltd:The | Method for heat treating copper-zinc alloy wire |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE669963C (en) * | 1936-10-30 | 1939-01-07 | Siemens Schuckertwerke Akt Ges | Process and device for bright annealing of incandescent material in standing pull-through annealing furnaces |
DE2601658C3 (en) * | 1976-01-17 | 1978-11-30 | Fa. J.F. Mahler, 7300 Esslingen | Cooling device for a continuous furnace open on the inlet and outlet side for the heat treatment of workpieces |
DE4125215A1 (en) * | 1991-07-30 | 1993-02-04 | Linde Ag | METHOD FOR PURIFYING OR PREPARING GASES |
-
1993
- 1993-11-18 DE DE19934339315 patent/DE4339315A1/en not_active Withdrawn
-
1994
- 1994-11-18 WO PCT/EP1994/003819 patent/WO1995014111A1/en not_active Application Discontinuation
- 1994-11-18 EP EP95901393A patent/EP0729519A1/en not_active Ceased
- 1994-11-18 CZ CZ19961436A patent/CZ288760B6/en not_active IP Right Cessation
-
1996
- 1996-05-17 FI FI962113A patent/FI107453B/en active
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
LU36453A1 (en) * | ||||
US3035824A (en) * | 1960-02-24 | 1962-05-22 | Midland Ross Corp | Furnace with cooled and recirculated atmosphere |
FR2397611A1 (en) * | 1977-07-12 | 1979-02-09 | Mat Thermique Moder Const | THERMAL TREATMENT OVEN |
FR2477900A1 (en) * | 1980-03-14 | 1981-09-18 | Heurtey Metallurgie | METHOD AND DEVICE FOR SEPARATING GASEOUS ATMOSPHERES IN ATMOSPHERE HEAT TREATMENT PLANTS |
DE9100289U1 (en) * | 1990-01-20 | 1991-04-04 | Wolfgang Kohnle Waermebehandlungsanlagen Gmbh, 7534 Birkenfeld, De | |
JPH03240938A (en) * | 1990-02-16 | 1991-10-28 | Furukawa Electric Co Ltd:The | Method for heat treating copper-zinc alloy wire |
Non-Patent Citations (1)
Title |
---|
DATABASE WPI Week 9149, Derwent World Patents Index; AN 91-358491 * |
Also Published As
Publication number | Publication date |
---|---|
CZ143696A3 (en) | 1996-09-11 |
FI107453B (en) | 2001-08-15 |
DE4339315A1 (en) | 1995-05-24 |
CZ288760B6 (en) | 2001-08-15 |
FI962113A (en) | 1996-05-17 |
FI962113A0 (en) | 1996-05-17 |
EP0729519A1 (en) | 1996-09-04 |
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