GB2092468A - Particulate medium for fluidized bed operations - Google Patents

Particulate medium for fluidized bed operations Download PDF

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Publication number
GB2092468A
GB2092468A GB8103541A GB8103541A GB2092468A GB 2092468 A GB2092468 A GB 2092468A GB 8103541 A GB8103541 A GB 8103541A GB 8103541 A GB8103541 A GB 8103541A GB 2092468 A GB2092468 A GB 2092468A
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GB
United Kingdom
Prior art keywords
particles
bed
fluidized bed
heating
workpiece part
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
Application number
GB8103541A
Other versions
GB2092468B (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Procedyne Corp
Original Assignee
Procedyne Corp
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 Procedyne Corp filed Critical Procedyne Corp
Priority to GB8103541A priority Critical patent/GB2092468B/en
Publication of GB2092468A publication Critical patent/GB2092468A/en
Application granted granted Critical
Publication of GB2092468B publication Critical patent/GB2092468B/en
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
    • B01J8/18—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles
    • B01J8/24—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles according to "fluidised-bed" technique
    • B01J8/46—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles according to "fluidised-bed" technique for treatment of endless filamentary, band or sheet material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
    • B01J8/18—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles
    • B01J8/1836—Heating and cooling the reactor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/32—Lubrication of metal being extruded or of dies, or the like, e.g. physical state of lubricant, location where lubricant is applied
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C29/00—Cooling or heating work or parts of the extrusion press; Gas treatment of work
    • 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
    • B21J3/00—Lubricating during forging or pressing
    • 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
    • C21D1/53—Heating in fluidised beds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2208/00—Processes carried out in the presence of solid particles; Reactors therefor
    • B01J2208/00008—Controlling the process
    • B01J2208/00017—Controlling the temperature
    • B01J2208/00106—Controlling the temperature by indirect heat exchange
    • B01J2208/00168—Controlling the temperature by indirect heat exchange with heat exchange elements outside the bed of solid particles
    • B01J2208/00212—Plates; Jackets; Cylinders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2208/00—Processes carried out in the presence of solid particles; Reactors therefor
    • B01J2208/00008—Controlling the process
    • B01J2208/00017—Controlling the temperature
    • B01J2208/00513—Controlling the temperature using inert heat absorbing solids in the bed

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Organic Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Lubricants (AREA)

Abstract

In the operation of a fluidized bed for pre-heating workpiece parts as a step in a metal working process, the bed is comprised of graphite or other solid lubricant instead of the refractory particles e.g., sand conventionally employed. Thus, the parts may be removed from the bed for a succeeding operation without the necessity of coating the part with a lubricant as a separate step. Stearate-type lubricants can be used for treating yarns.

Description

SPECIFICATION Particulate medium for fluidized bed operations There are many applications in the metal-working industry where heating of a workpiece part in a fluidized bed is desired. For example, the forging of steel or aluminium parts is performed at elevated temperatures. Similarly, extrusion of metals requires prior heating. The pre-heating of billets can be accomplished safely and economically in a fluidized bed.
However, one of the disadvantages of the conventional fluidized bed, i.e. the use of particles of refractory material as the fluidized medium, is the fact that particles of bed material which cling to the part are frequently carried along into the site of a subsequent operation. Since most materials commonly employed are aluminium oxides, silica sands, or other abrasive-type granules, such carry-out can damage the subsequent forging or extrusion dies.
According to the present invention there is provided a fluidized bed for heating a workpiece part immersed therein prior to subjecting the part to a forming operation, comprising a receptacle to contain a charge of solid particles to transfer heat to the workpiece part and means to pass a gas under pressure through the mass of particles to agitate the particles for optimum transfer of heat, in which said particles comprise a solid lubricant.
By using solid particles selected from a family of lubricating-type materials, e.g. graphite, the fluidized bed may be used for its intended basic function of subjecting the workpiece part to heat and the problems attendant upon the presence of abrasive particles eliminated. As a matter of fact, since graphite is frequently used to lubricate the tools employed in subsequently working the workpiece part, any particles carried over from the bed contribute in a salutary way.
Other examples of the use of lubricating type materials for fluidized beds can include, but are not limited to, zinc oxides and stearate-type materials which are used as lubricants in the textile industry and hence can be used for the heating and curing of synthetic yarns where these materials are used as lubricants in subsequent weaving operations.
1. Afluidized bed for heating a workpiece part immersed therein prior to subjecting the part to a forming operation, comprising a receptacle to contain a charge of solid particles to transfer heat to the workpiece part and means to pass a gas under pressure through the mass of particles to agitate the particles for optimum transfer of heat, in which said particles comprise a solid lubricant.
2. Afluidized bed as claimed in claim 1, in which the particles comprise graphite particles.
3. Afluidized bed as claimed in claim 1, in which the particles comprise stearate-type material particles capable of use as a lubricant.
4. Afluidized bed as claimed in claim 3, in which the stearate-type material particles are capable of use as a lubricant for yarn as used in the manufacture of textiles.
5. A fluidized bed as claimed in any preceding claim, substantially as hereinbefore described.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (5)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Particulate medium for fluidized bed operations There are many applications in the metal-working industry where heating of a workpiece part in a fluidized bed is desired. For example, the forging of steel or aluminium parts is performed at elevated temperatures. Similarly, extrusion of metals requires prior heating. The pre-heating of billets can be accomplished safely and economically in a fluidized bed. However, one of the disadvantages of the conventional fluidized bed, i.e. the use of particles of refractory material as the fluidized medium, is the fact that particles of bed material which cling to the part are frequently carried along into the site of a subsequent operation. Since most materials commonly employed are aluminium oxides, silica sands, or other abrasive-type granules, such carry-out can damage the subsequent forging or extrusion dies. According to the present invention there is provided a fluidized bed for heating a workpiece part immersed therein prior to subjecting the part to a forming operation, comprising a receptacle to contain a charge of solid particles to transfer heat to the workpiece part and means to pass a gas under pressure through the mass of particles to agitate the particles for optimum transfer of heat, in which said particles comprise a solid lubricant. By using solid particles selected from a family of lubricating-type materials, e.g. graphite, the fluidized bed may be used for its intended basic function of subjecting the workpiece part to heat and the problems attendant upon the presence of abrasive particles eliminated. As a matter of fact, since graphite is frequently used to lubricate the tools employed in subsequently working the workpiece part, any particles carried over from the bed contribute in a salutary way. Other examples of the use of lubricating type materials for fluidized beds can include, but are not limited to, zinc oxides and stearate-type materials which are used as lubricants in the textile industry and hence can be used for the heating and curing of synthetic yarns where these materials are used as lubricants in subsequent weaving operations. CLAIMS
1. Afluidized bed for heating a workpiece part immersed therein prior to subjecting the part to a forming operation, comprising a receptacle to contain a charge of solid particles to transfer heat to the workpiece part and means to pass a gas under pressure through the mass of particles to agitate the particles for optimum transfer of heat, in which said particles comprise a solid lubricant.
2. Afluidized bed as claimed in claim 1, in which the particles comprise graphite particles.
3. Afluidized bed as claimed in claim 1, in which the particles comprise stearate-type material particles capable of use as a lubricant.
4. Afluidized bed as claimed in claim 3, in which the stearate-type material particles are capable of use as a lubricant for yarn as used in the manufacture of textiles.
5. A fluidized bed as claimed in any preceding claim, substantially as hereinbefore described.
GB8103541A 1981-02-05 1981-02-05 Particulate medium for fluidized bed operations Expired GB2092468B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8103541A GB2092468B (en) 1981-02-05 1981-02-05 Particulate medium for fluidized bed operations

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8103541A GB2092468B (en) 1981-02-05 1981-02-05 Particulate medium for fluidized bed operations

Publications (2)

Publication Number Publication Date
GB2092468A true GB2092468A (en) 1982-08-18
GB2092468B GB2092468B (en) 1985-05-30

Family

ID=10519466

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8103541A Expired GB2092468B (en) 1981-02-05 1981-02-05 Particulate medium for fluidized bed operations

Country Status (1)

Country Link
GB (1) GB2092468B (en)

Also Published As

Publication number Publication date
GB2092468B (en) 1985-05-30

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