EP1348770A1 - Plant and procedure for the production of small parts in hot formed steel - Google Patents
Plant and procedure for the production of small parts in hot formed steel Download PDFInfo
- Publication number
- EP1348770A1 EP1348770A1 EP02006521A EP02006521A EP1348770A1 EP 1348770 A1 EP1348770 A1 EP 1348770A1 EP 02006521 A EP02006521 A EP 02006521A EP 02006521 A EP02006521 A EP 02006521A EP 1348770 A1 EP1348770 A1 EP 1348770A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- small parts
- tunnel
- cooling
- hot
- plant
- 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.)
- Withdrawn
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J9/00—Forging presses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
- B21J1/06—Heating or cooling methods or arrangements specially adapted for performing forging or pressing operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J13/00—Details of machines for forging, pressing, or hammering
-
- 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
- C21D9/0062—Heat-treating apparatus with a cooling or quenching zone
-
- 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
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
-
- 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
- C21D1/18—Hardening; Quenching with or without subsequent tempering
- C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
-
- 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
- C21D1/84—Controlled slow cooling
Definitions
- the present finding relates to a plant and a procedure for the production of small parts in hot formed steel.
- the production of small parts in hot formed steel can be performed by hot-pressing and successive hardening heat treatment, followed by successive tempering heat treatment.
- the object of the present invention is to obviate the problem of prior art by proposing a plant and procedure that make it possible to reduced the power consumption.
- the plant comprises means 1 suitable to hot-press small parts in steel, typically a pressing heat 1 of the known type.
- the hot-pressed small parts are delivered from the heat at an average temperature of approximately 900-950°C.
- Means 2, suitable to perform a first cooling of the small parts delivered from the heat, and means 3 suitable to perform a second cooling to ambient temperature, are provided.
- the first cooling means 2 perform cooling of the small parts from a temperature of 900-950°C to a temperature of 400-450°C in a time approximately between 50 and 100 seconds, with an average cooling speed between 8 and 12°C/second.
- the second cooling means 3 perform cooling from the temperature of 400-450°C to ambient temperature at an average cooling speed of 30-50°C/hour.
- the means 2 suitable to perform the first cooling comprise a tunnel 4, means 5 suitable to convey the small metal parts essentially through the entire length of said tunnel 4, means 6 suitable to create a current of air in the tunnel 4 and means 7 suitable to introduce nebulized water into the tunnel 4.
- the air and nebulized water are introduced into the tunnel at ambient temperature.
- the tunnel 4 is 5 metres in length and has an air flow section of 4 dm 2 , the small parts remain in the tunnel for approximately 50 to 100 seconds, the air flow is approximately 40 m 3 /hour and the quantity of nebulized water introduced into the tunnel is approximately 5 m 3 /hour.
- the small metal parts are delivered from the tunnel at an average temperature of approximately 400-450°C.
- the tunnel 4 has a rectangular section and the transporting means 5 are composed of a conveyor belt 5, of the known type, arranged inside the tunnel 4, which conveys the small parts essentially along the entire length of the tunnel 4.
- a special fan 6 is provided, connected at the end of the tunnel into which the small parts, still hot, are fed.
- a special pump supplies one or more nozzles which nebulize the water at the entrance to the tunnel.
- the small parts enter the tunnel through a special opening transversal to the axis of the tunnel.
- the nebulized water rapidly absorbs the heat of the small parts and is delivered from the end of the tunnel, together with the air, in the form of unsaturated vapour.
- means to regulate the cooling speed of the first means 2 to regulate the speed at which the small metal parts are conveyed inside the tunnel and/or means to regulate the flow of the air current inside said tunnel and/or means to regulate the flow of nebulized water are provided.
- the second cooling means 3 are suitable to move the small parts in a calm air environment, to perform slow, preferably isothermal, cooling.
- the means 3 suitable to perform cooling in calm air comprise a hollow cylindrical body 8, with a vertical axis, with a top feed opening 9 and a bottom delivery opening 10.
- the hollow cylindrical body is divided into a plurality of cylindrical chambers 11 overlapping and connected sequentially by means of openings arranged according to a helical trajectory.
- Each chamber 11 is provided with a plurality of blades 13 connected to a single rotating shaft 14, suitable to give the small parts a rotatory movement in the opposite direction to said helical trajectory.
- the two cooling processes give the small parts a fine crystalline structure, essentially of the bainitic type, provided with appreciable hardness and toughness (up to 36 HRC).
- the plant is particularly suitable for carbon, carbon and boron, alloy and micro-alloy steels.
Abstract
The invention concerns a plant for the production of small parts in hot formed steel
comprising
- means (1) suitable to hot-press small parts in steel;
- means (2) suitable to perform a first cooling of the hot-pressed small parts to a temperature of 400-450°C at an average cooling speed of 8-12°C/second.
- means (3) suitable to perform a second cooling of the hot-pressed steel from 400-450°C to ambient temperature at an average speed of 30-50°C/hour.
Description
- The present finding relates to a plant and a procedure for the production of small parts in hot formed steel.
- The production of small parts in hot formed steel can be performed by hot-pressing and successive hardening heat treatment, followed by successive tempering heat treatment.
- The procedure for the production of small parts in hot formed steel currently known requires a considerable quantity of power consumption.
- The object of the present invention is to obviate the problem of prior art by proposing a plant and procedure that make it possible to reduced the power consumption.
- Said object is attained with a plant and a procedure conforming to the respective independent claims.
- A possible embodiment of the plant, conforming to the precept of the patent claims, is described below with reference to the accompanying tables in which:
- Fig. 1 is a schematic view of the plant in question;
- Fig. 2 is a front section view of a first cooling device that forms an integral part of the plant;
- Fig. 3 is a top view of a part of a second cooling device that forms an integral part of the plant;
- Fig. 4 is a top view of a second cooling device that forms an integral part of the plant;
- Fig. 5 is a top, partially sectional view of said second cooling device.
-
- With reference to the aforesaid figures the plant comprises means 1 suitable to hot-press small parts in steel, typically a pressing heat 1 of the known type.
- The hot-pressed small parts are delivered from the heat at an average temperature of approximately 900-950°C.
-
Means 2, suitable to perform a first cooling of the small parts delivered from the heat, and means 3 suitable to perform a second cooling to ambient temperature, are provided. - The first cooling means 2 perform cooling of the small parts from a temperature of 900-950°C to a temperature of 400-450°C in a time approximately between 50 and 100 seconds, with an average cooling speed between 8 and 12°C/second.
- The second cooling means 3 perform cooling from the temperature of 400-450°C to ambient temperature at an average cooling speed of 30-50°C/hour.
- The
means 2 suitable to perform the first cooling comprise atunnel 4, means 5 suitable to convey the small metal parts essentially through the entire length of saidtunnel 4, means 6 suitable to create a current of air in thetunnel 4 and means 7 suitable to introduce nebulized water into thetunnel 4. - Typically, the air and nebulized water are introduced into the tunnel at ambient temperature.
- For a plant that produces 90 nuts per minute, weighing 300 grams each, the
tunnel 4 is 5 metres in length and has an air flow section of 4 dm2, the small parts remain in the tunnel for approximately 50 to 100 seconds, the air flow is approximately 40 m3/hour and the quantity of nebulized water introduced into the tunnel is approximately 5 m3/hour. - The small metal parts are delivered from the tunnel at an average temperature of approximately 400-450°C.
- In the embodiment shown the
tunnel 4 has a rectangular section and the transportingmeans 5 are composed of aconveyor belt 5, of the known type, arranged inside thetunnel 4, which conveys the small parts essentially along the entire length of thetunnel 4. - To create the air current inside the tunnel, a special fan 6 is provided, connected at the end of the tunnel into which the small parts, still hot, are fed.
- A special pump supplies one or more nozzles which nebulize the water at the entrance to the tunnel.
- The small parts enter the tunnel through a special opening transversal to the axis of the tunnel.
- The nebulized water rapidly absorbs the heat of the small parts and is delivered from the end of the tunnel, together with the air, in the form of unsaturated vapour.
- To regulate the cooling speed of the
first means 2, means (not shown) to regulate the speed at which the small metal parts are conveyed inside the tunnel and/or means to regulate the flow of the air current inside said tunnel and/or means to regulate the flow of nebulized water are provided. - The second cooling means 3 are suitable to move the small parts in a calm air environment, to perform slow, preferably isothermal, cooling.
- The
means 3 suitable to perform cooling in calm air comprise a hollow cylindrical body 8, with a vertical axis, with a top feed opening 9 and a bottom delivery opening 10. - Internally the hollow cylindrical body is divided into a plurality of cylindrical chambers 11 overlapping and connected sequentially by means of openings arranged according to a helical trajectory.
- Each chamber 11 is provided with a plurality of
blades 13 connected to a single rotatingshaft 14, suitable to give the small parts a rotatory movement in the opposite direction to said helical trajectory. - The two cooling processes give the small parts a fine crystalline structure, essentially of the bainitic type, provided with appreciable hardness and toughness (up to 36 HRC).
- By varying the flow of air and/or nebulized water and/or the time the small parts remain inside the tunnel it is possible to modify the quality of the final crystalline structure.
- The plant is particularly suitable for carbon, carbon and boron, alloy and micro-alloy steels.
- It is apparent that the plant described above consumes less power and its construction is relatively simple.
Claims (6)
- Plant for the production of small parts in hot formed steel comprisingmeans (1) suitable to hot-press small parts in steel;means (2) suitable to perform a first cooling of the hot-pressed small parts to a temperature of 400-450°C at an average cooling speed of 8-12°C/second;means (3) suitable to perform a second cooling of the hot-pressed steel from 400-450°C to ambient temperature at an average speed of 30-50°C/hour.
- Plant, as claimed in claim 1, in which said means (2) to perform said first cooling comprise:a tunnel (4);means (5) suitable to receive the hot-pressed small parts at one end of the tunnel and to convey the small metal parts through said tunnel (4);means (6) suitable to create a current of air in said tunnel (4);means (7) suitable to introduce nebulized water into said tunnel (4).
- Plant, as claimed in claim 2, in which means to regulate the speed at which the small metal parts are conveyed and/or means to regulate the flow of the air current inside said tunnel and/or means to regulate the flow of nebulized water are provided.
- Plant, as claimed in any of the previous claims, in which said means (3) suitable to perform cooling in calm air comprise a hollow cylindrical body (8), with a vertical axis, with a top feed opening (9) and a bottom delivery opening (10) and divided internally into a plurality of overlapping cylindrical chambers (11) connected sequentially by means of openings (12) arranged according to a helical trajectory, provided in each chamber (11) with a plurality of blades (13), connected to a single rotating shaft (14), suitable to give the small parts a rotatory movement in the opposite direction to said helical trajectory.
- Procedure for the production of small parts in hardened steel comprising the following steps:hot-pressing of the small metal parts;reducing the temperature of the small parts from 900-950°C to 400-450°C at an average speed of 8-12°C/second;reducing the temperature of the small parts from 400-450°C to ambient temperature at an average speed of 30-50°C/hour.
- Procedure, as claimed in claim 5, in which said first cooling is performed with a flow or air and nebulized water.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP02006521A EP1348770A1 (en) | 2002-03-19 | 2002-03-19 | Plant and procedure for the production of small parts in hot formed steel |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP02006521A EP1348770A1 (en) | 2002-03-19 | 2002-03-19 | Plant and procedure for the production of small parts in hot formed steel |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1348770A1 true EP1348770A1 (en) | 2003-10-01 |
Family
ID=27798794
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02006521A Withdrawn EP1348770A1 (en) | 2002-03-19 | 2002-03-19 | Plant and procedure for the production of small parts in hot formed steel |
Country Status (1)
Country | Link |
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EP (1) | EP1348770A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1911536A1 (en) * | 2005-07-14 | 2008-04-16 | JFE Steel Corporation | Hot forging equipment |
CN113547066A (en) * | 2021-08-14 | 2021-10-26 | 东莞市立丞五金制品有限公司 | Cold heading system of processing |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2048736A (en) * | 1979-05-11 | 1980-12-17 | Msp Ind | Warm Forging of Connecting Rod Caps |
US4714500A (en) * | 1984-12-21 | 1987-12-22 | Krupp Stahl Ag | Method for thermal treatment of pearlitic rail steels |
EP0384181A2 (en) * | 1989-02-03 | 1990-08-29 | Hitachi, Ltd. | Steam turbine rotor shaft and heat-resisting steel therefor |
EP0735150A2 (en) * | 1995-03-29 | 1996-10-02 | Toyota Jidosha Kabushiki Kaisha | Method for producing cast iron gear |
WO1999002744A1 (en) * | 1997-07-10 | 1999-01-21 | Skf Engineering & Research Centre B.V. | Method for performing a heat treatment on metallic rings, and bearing ring thus obtained |
WO2001071050A1 (en) * | 2000-03-24 | 2001-09-27 | Kawasaki Steel Corporation | Non-refined steel being reduced in anisotropy of material and excellent in strength, toughness and machinability |
US20010025674A1 (en) * | 1994-07-19 | 2001-10-04 | Voest Alpine Schienen Gmbh & Co. | Method for heat-treating profiled rolling stock |
-
2002
- 2002-03-19 EP EP02006521A patent/EP1348770A1/en not_active Withdrawn
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2048736A (en) * | 1979-05-11 | 1980-12-17 | Msp Ind | Warm Forging of Connecting Rod Caps |
US4714500A (en) * | 1984-12-21 | 1987-12-22 | Krupp Stahl Ag | Method for thermal treatment of pearlitic rail steels |
EP0384181A2 (en) * | 1989-02-03 | 1990-08-29 | Hitachi, Ltd. | Steam turbine rotor shaft and heat-resisting steel therefor |
US20010025674A1 (en) * | 1994-07-19 | 2001-10-04 | Voest Alpine Schienen Gmbh & Co. | Method for heat-treating profiled rolling stock |
EP0735150A2 (en) * | 1995-03-29 | 1996-10-02 | Toyota Jidosha Kabushiki Kaisha | Method for producing cast iron gear |
WO1999002744A1 (en) * | 1997-07-10 | 1999-01-21 | Skf Engineering & Research Centre B.V. | Method for performing a heat treatment on metallic rings, and bearing ring thus obtained |
WO2001071050A1 (en) * | 2000-03-24 | 2001-09-27 | Kawasaki Steel Corporation | Non-refined steel being reduced in anisotropy of material and excellent in strength, toughness and machinability |
EP1199375A1 (en) * | 2000-03-24 | 2002-04-24 | Kawasaki Steel Corporation | Non-refined steel being reduced in anisotropy of material and excellent in strength, toughness and machinability |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1911536A1 (en) * | 2005-07-14 | 2008-04-16 | JFE Steel Corporation | Hot forging equipment |
EP1911536A4 (en) * | 2005-07-14 | 2013-11-06 | Jfe Steel Corp | Hot forging equipment |
CN113547066A (en) * | 2021-08-14 | 2021-10-26 | 东莞市立丞五金制品有限公司 | Cold heading system of processing |
CN113547066B (en) * | 2021-08-14 | 2023-10-20 | 东莞市立丞五金制品有限公司 | Cold heading system of processing |
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