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
  • F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
  • F27B9/36—Arrangements of heating devices
• • 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
• • 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
  • C21D1/34—Methods of heating
• • 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
  • C21D11/00—Process control or regulation for heat treatments
• • 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
  • C21D9/0056—Furnaces through which the charge is moved in a horizontal straight 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
  • F27B9/40—Arrangements of controlling or monitoring devices
• • 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
  • C21D2221/00—Treating localised areas of an article
• • 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
  • C21D2221/00—Treating localised areas of an article
  • C21D2221/01—End parts (e.g. leading, trailing end)
• • 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
  • C21D2221/00—Treating localised areas of an article
  • C21D2221/02—Edge parts

Definitions

• the invention relates to a method for heating a molded component for subsequent press hardening, wherein the mold component is first heated to a predetermined temperature and then heated in regions by means of mutually independently controllable heating elements of a Schuelementfeldes to a higher temperature.
• the invention is therefore based on the object, a method for heating a mold component to different temperatures in such a way that, despite a continuous flow, the mold components can be subjected to a required for the subsequent press hardening heat treatment with improved temperature control within the different parts to be heated.
• the invention solves the stated object, characterized in that the mold component during its promotion by the Schuelementfeld with the aid of the conveying direction in longitudinal and transverse rows arranged, at least in groups with different heating power controlled Heating elements is heated.
• the heating elements can be controlled with different heating power, an essential prerequisite for an improved temperature control of the molded components is initially met.
• the possibility of controlling the heating elements of both the longitudinal rows and the transverse rows independently of each other, at least in groups it is additionally possible to influence the temperature of the molded components in a longitudinal strip extending in the conveying direction during component feeding, in order not only reach specified temperature levels in the region of such longitudinal strips, but also to be able to hold for a predetermined time.
• the mold components can be cooled strip-shaped in the conveying direction over the longitudinal rows of the heating elements associated, optionally controllable cooling devices.
• This optional cooling allows in a conventional manner, an additional heat dissipation, which facilitates the maintenance of a predetermined temperature profile during the area-wise heat treatment of the mold components, if necessary.
• the associated with such heat dissipation heat losses are to be accepted.
• a continuous furnace for heating in portions a preformed preheated to a predetermined temperature component to a higher temperature with a furnace housing passing through conveyor for the molding and with a conveyor element associated Schuelementfeld from each independently controllable heating elements can be assumed. If the heating elements arranged in longitudinal and transverse rows with respect to the conveying direction of the conveyor are controlled at least in groups in the longitudinal and transverse directions with different heating powers, additional heat in the region of the longitudinal rows of the heating elements can be sensitively introduced into the mold component to be treated over the length of the heating element field in that in the respective longitudinal strip of the molded component a predetermined temperature ratur Installation can be maintained over the length of the continuous furnace, and largely independent of the temperature control in an adjacent longitudinal strip.
• heating elements are designed as electrical resistance heaters, because in this case the control of heating power This heating elements can be made very simple.
• the longitudinal rows of the heating elements can optionally be assigned controllable cooling devices.
• An additional delimitation of these possible cooling zones can be achieved by separating webs between the cooling devices, which form a thermal insulation between the longitudinal rows of the heating elements.
• cooling devices naturally depends on their distance from the cooling region of the mold components. For this reason, particularly advantageous design requirements for such cooling devices arise when the heating elements are arranged in a connectable to a cooling air jacket casing, so that the distance between the cooled longitudinal strips of the mold components and the cooling devices can be kept small without affecting the heating power.
• the jacket pipes are separated from the cooling air blower. At best, the cooling effect can be increased by blowing a cooling gas over the jacket tubes of the heating elements onto the area of the molded component to be treated.
• Fig. 2 shows the distribution of the heating elements of a Schuelementfeldes the continuous furnace in a schematic block diagram
• Fig. 3 shows the temperature profile in the region of individual longitudinal strips of a mold component during its promotion by the continuous furnace.
• heating elements 7 in longitudinal rows 8 and transverse rows 9 of a Schuelementfeldes 10 are provided in the continuous furnace 1 by means of a conveyor 11 whose conveyor rollers are designated by 12 in FIG.
• the heating elements 7 are provided above and below the conveyor 11.
• the lined with a thermal insulation 13 furnace housing 14 has in the region of the longitudinal rows 8 of the heating elements 7 cooling means 15 in the form of cooling tubes, which can be selectively connected to a cooling fan.
• these cooling tubes can represent jacket tubes of the heating elements 7, so that the cooling devices 15 come closer to the shaped components 2 due to this design. which improves the cooling effect at a given cooling performance.
• cooling zones separating webs 16 may be provided which form a thermal insulation to better distinguish the cooling zones from each other or from the adjacent heating zones.
• the heating elements 7 are preferably formed as electrical resistance heaters, which can be controlled independently of each other at least in groups with different heating power. 2, the percentage of the heating power is given, with which the individual heating elements 7 are driven. This means in the indication 100 that the heating elements 7 are driven with the full heating power, but that the heating elements 7 with the indication 0 are switched off, while the indication 50 denotes a control of the heating elements 7 with half the heating power.
• FIG. 3 the temperature profile in selected longitudinal strips a, b, c, d with respect to the conveying direction 3 of the mold component 2 during the kiln passage in the control of the heating elements 7 is shown with the heating powers indicated for the individual heating elements 7. It turns out that in the common heating zone 4, the molded component 2 is heated to a predetermined temperature below the temperature Ti for the AC3 point. Due to the mass distribution arise at the output of the heating zone 4 for the individual longitudinal strips a, b, c, d of the mold component 2 different temperatures T a , T b , T c , T d .
• the temperature in the heating zone 5 should be raised above the temperature Ti of the AC3 point, the temperature in the region of the longitudinal strip c should be kept below the temperature Ti. For this reason, the heating elements 7 of the longitudinal strip c associated longitudinal row 8 of the Schuelementfeldes 10 are turned off, so that only a slight heat input through the heating elements 7 of the adjacent longitudinal rows 8 results in the region of the heating zone 5, which are each driven with half heating power.
• the temperature profile t c for this longitudinal strip c shows this fact behaves.
• the temperature profile t a would result in a continued heating to an excessively high treatment temperature at the exit of the heating zone 5.
• the heating elements 7 of the adjacent longitudinal rows 8 of the heating element field 10 are provided in the region of the longitudinal strip a for a restricted heat supply, as can be seen from the temperature profile t a in the region of the heating zone 5. Since the starting temperatures of the heating zone 4 for the longitudinal strips b and d are comparatively low, a higher heat input in these longitudinal strips b and d in the region of the heating zone 5 is required to ensure the respective holding temperatures at the exit of the heating zone 5.
• the heating elements 7 in the heating zone 5 associated with the longitudinal strips b and d are therefore subjected to full heating power in the area of the longitudinal strip b and 60% of the heating power in the region of the longitudinal strip d, so that the curve t b or t d results with the the holding temperatures at the exit of the heating zone 5 for the associated longitudinal strips b, d can be ensured.
• the heating elements 7 belonging to the individual longitudinal strips 7 of the holding zone 6 are activated with a corresponding power.
• the heat outputs of the heating elements 7 of the adjacent longitudinal rows 8 results for the maintenance of the temperature gradient t a a heating power of each
• the temperature profile t b is ensured by the sequence of heating elements 7, which are controlled with 80 or 70% of the heating power, in the associated longitudinal row 8.
• the heating elements 7 in the holding zone 6 are first controlled with 60% and then with 70% of the heating power. Because of this sensitive control of the amount of heat introduced into the mold component in strips, a predetermined temperature profile can advantageously be maintained, with the aid of the additional cooling possibility indicated in FIG. is opened when a given temperature profile requires the additional cooling of a strip area.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Mechanical Engineering (AREA)
• Crystallography & Structural Chemistry (AREA)
• Thermal Sciences (AREA)
• Physics & Mathematics (AREA)
• Materials Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• General Engineering & Computer Science (AREA)
• Tunnel Furnaces (AREA)
• Heat Treatment Of Articles (AREA)
• Furnace Details (AREA)
• Heat Treatments In General, Especially Conveying And Cooling (AREA)
• Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)

Applications Claiming Priority (1)

Publications (1)

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ID=44629754

Family Applications (1)

Country Status (10)

Families Citing this family (15)

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• 2011
  • 2011-06-30 MX MX2013014246A patent/MX2013014246A/es not_active Application Discontinuation
  • 2011-06-30 US US14/112,634 patent/US20140045130A1/en not_active Abandoned
  • 2011-06-30 CN CN201180071338.0A patent/CN103765145A/zh active Pending
  • 2011-06-30 RU RU2014103103/02A patent/RU2014103103A/ru not_active Application Discontinuation
  • 2011-06-30 KR KR1020137029593A patent/KR20140029438A/ko not_active Application Discontinuation
  • 2011-06-30 EP EP11740805.4A patent/EP2726802A1/de not_active Withdrawn
  • 2011-06-30 WO PCT/AT2011/000286 patent/WO2013000001A1/de active Application Filing
  • 2011-06-30 CA CA2834558A patent/CA2834558A1/en not_active Abandoned
  • 2011-06-30 JP JP2014517321A patent/JP2014522911A/ja not_active Withdrawn
  • 2011-06-30 BR BR112013029982A patent/BR112013029982A2/pt not_active IP Right Cessation

Non-Patent Citations (1)

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