GB2206632A - Process for the production of hardened particulate metallic material - Google Patents

Process for the production of hardened particulate metallic material Download PDF

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Publication number
GB2206632A
GB2206632A GB8814819A GB8814819A GB2206632A GB 2206632 A GB2206632 A GB 2206632A GB 8814819 A GB8814819 A GB 8814819A GB 8814819 A GB8814819 A GB 8814819A GB 2206632 A GB2206632 A GB 2206632A
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GB
United Kingdom
Prior art keywords
particles
metallic material
production
particulate metallic
heat treating
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
GB8814819A
Other versions
GB2206632B (en
GB8814819D0 (en
Inventor
Charles Boswell Brown
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB8814819D0 publication Critical patent/GB8814819D0/en
Publication of GB2206632A publication Critical patent/GB2206632A/en
Application granted granted Critical
Publication of GB2206632B publication Critical patent/GB2206632B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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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
    • C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/14—Treatment of metallic powder
    • B22F1/142—Thermal or thermo-mechanical treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C11/00—Selection of abrasive materials or additives for abrasive blasts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

A process for the production of particulate metallic material, in particular metallic shot or grit. In order to produce particulate metallic material at a low cost per unit mass of usable material produced, the process includes the steps of reducing swarf or other scrap metal, separating out the particles of usable size, and heat treating the separated out particles to harden them.

Description

Process for the production of particulate metallic material.
The invention relates to a process for the production of particulate metallic material, in particular for producing metallic shot or grit.
Metallic shot or grit is widely used for blast cleaning. In the production of metallic material with which the inventive method is concerned, it is important that it should be produced relatively cheaply and also that it should be capable of being re-cycled for a sufficient period so that blast cleaning operations can be carried on economically.
It has been known to produce blasting shot or abrasive grit utilising ferrous swarf as starting material comprising heat treating the ferrous material to harden at least the surfaces thereof, crushing or otherwise reducing the material into particles, and separating the particles to obtain shot or grit particles. However, it has been found that this method has not been economically viable, basically because particles of shot or grit of a size useful for blast cleaning comprised only a relatively small proportion of the crushed or otherwise reduced material. The object of the invention is to provide a process for producing blasting shot or abrasive grit which will provide such material at a lower cost per unit mass of usable material produced.
According to the invention, there is provided a process for the production of particulate metallic material, the process including the steps of reducing swarf or other scrap metal, separating out the particles of usable size, and heat treating the separated out particles to harden at least the surfaces thereof. The step of heat treating the separated out particles may involve a gas carburising process and will involve a subsequent quenching and tempering of the heated particles.
The step of heat treating the separated out particles may be preceded by a de-greasing operation.
In order that the invention may be fully understood and readily carried into effect, the same will now be described, by way of example only, with reference to the accompanying drawing which is a flow diagram illustrating the various steps in the process.
Referring now to the drawing, a process embodying the invention for the production of particulate metallic material includes the steps of reducing swarf or other scrap metal in apparatus generally indicated 10, separating out the particles of usable size in sieving apparatus generally indicated 12, and heat treating the separated out particles in heating apparatus generally indicated 14, quenching apparatus generally indicated 16, and tempering apparatus generally indicated 18.
The apparatus generally indicated 10 for reducing the swarf or other scrap metal is not illustrated in detail because it will be designed or selected to suit the particular kind of swarf or other scrap metal being processed and to reduce the starting metal to particles of predominantly the required size, consistently and without the need for constant renewal and repair.
The heating apparatus generally indicated 14 will be appropriate to the starting material and to the properties required in the finished product. For example, the heat treatment apparatus may be capable of performing a gas carburising operation.
The production of particulate metallic material in the manner described is able to be carried on at a relatively low cost per unit mass of usable material produced. This is because, since the step of separating out the particles of usable size is performed before the heat treatment is carried out, heat is not wasted on the heat treatment of material which will subsequently be scrapped.
However, various modifications may be made to the method described above. For example, the step of heat treating the separated out particles may be preceded by a de-greasing operation of the kind which will be familiar to those skilled in the art.
The step of heat treating the separated out particles may be carried out in the manner most appropriate according to the general composition of the starting material and may involve consecutive hardening and tempering operations. The heat treatment may involve a gas carburising process.
It will generaly be found that rapid quenching is not crucial. However, depending on the type of swarf or other scrap metal used as the starting material, quenching sufficient to appropriately harden the particulate metallic material may be carried out.
The most obvious starting process is the kind of swarf resulting from various machining operations such as turning, boring and milling. However, other materials can be used, for example the waste resulting from stamping operations using relatively thin metal strip. Indeed, it would even be possible to use chopped steel wire of suitable composition.
The starting material will generally be a ferrous material but need not necessarily be so.

Claims (4)

CLAIMS:
1. A process for the production of particulate metallic material, the process including the steps of reducing swarf or other scrap metal, separating -out the particles of usable size, and heat treating the separated out particles to harden at least the surfaces thereof.
2. The process as claimed in claim 1, in which the step of heat treating the separated out particles involves a gas carburising process and also involves a subsequent quenching and tempering of the heated particles.
3. The process as claimed in either one of the preceding claims, in which the step of heat treating the separated out particles is preceded by a de-greasing operation.
4. A process for the production of particulate metallic material, substantially as hereinbefore described with reference to and as illustrated by the accompanying drawings.
GB8814819A 1987-07-08 1988-06-22 Process for the production of particulate metallic material Expired - Fee Related GB2206632B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8716042A GB8716042D0 (en) 1987-07-08 1987-07-08 Production of particulate metallic material

Publications (3)

Publication Number Publication Date
GB8814819D0 GB8814819D0 (en) 1988-07-27
GB2206632A true GB2206632A (en) 1989-01-11
GB2206632B GB2206632B (en) 1991-05-29

Family

ID=10620291

Family Applications (2)

Application Number Title Priority Date Filing Date
GB8716042A Pending GB8716042D0 (en) 1987-07-08 1987-07-08 Production of particulate metallic material
GB8814819A Expired - Fee Related GB2206632B (en) 1987-07-08 1988-06-22 Process for the production of particulate metallic material

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB8716042A Pending GB8716042D0 (en) 1987-07-08 1987-07-08 Production of particulate metallic material

Country Status (1)

Country Link
GB (2) GB8716042D0 (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB967349A (en) * 1961-06-28 1964-08-19 Desmond James Hutson Improvements in or relating to blast cleaning and like operations

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB967349A (en) * 1961-06-28 1964-08-19 Desmond James Hutson Improvements in or relating to blast cleaning and like operations

Also Published As

Publication number Publication date
GB2206632B (en) 1991-05-29
GB8814819D0 (en) 1988-07-27
GB8716042D0 (en) 1987-08-12

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Legal Events

Date Code Title Description
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19960622