JPS5677324A - Cooling method and its apparatus in heat treatment of tool steel - Google Patents

Cooling method and its apparatus in heat treatment of tool steel

Info

Publication number
JPS5677324A
JPS5677324A JP15467479A JP15467479A JPS5677324A JP S5677324 A JPS5677324 A JP S5677324A JP 15467479 A JP15467479 A JP 15467479A JP 15467479 A JP15467479 A JP 15467479A JP S5677324 A JPS5677324 A JP S5677324A
Authority
JP
Japan
Prior art keywords
tool steels
atmosphere
cooling
tool
gas
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
JP15467479A
Other languages
Japanese (ja)
Other versions
JPS5827324B2 (en
Inventor
Masayoshi Shimizu
Takuya Echigoya
Yoshito Sone
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.)
SHIMIZU DENSETSU KOGYO KK
Kobe Steel Ltd
Original Assignee
SHIMIZU DENSETSU KOGYO KK
Kobe Steel Ltd
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 SHIMIZU DENSETSU KOGYO KK, Kobe Steel Ltd filed Critical SHIMIZU DENSETSU KOGYO KK
Priority to JP54154674A priority Critical patent/JPS5827324B2/en
Publication of JPS5677324A publication Critical patent/JPS5677324A/en
Publication of JPS5827324B2 publication Critical patent/JPS5827324B2/en
Expired legal-status Critical Current

Links

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
    • 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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)

Abstract

PURPOSE:To eliminate the uneven properties in tool steels based on the difference in cooling rate at the time of cooling the heat-treated tool steels in a cooling chamber, by circulating an in-furnace gas selectively in a forward direction from above to below and a backward direction from below to above for the tool steels and the coolers on both sides thereof. CONSTITUTION:At the time of heat treating tool steels in a nonoxidative atmosphere heating furnace consisting of a heating part 10 and a cooling part 2, first the tool steel is preheated and held at 800-900 deg.C by the heater 9 in a heating furnace of a vacuum atmosphere, and further the temperature is raised to 1,000-1,100 deg.C, after which the atmosphere is substituted with an N2 gas or inert gas atmosphere and tool steel is subjected to regular heating for 10-30min at 1,200- 1,300 deg.C. Following to this, the tool steels I-V are put into the cooling part 2 between coolers 3, 3' consisting of the heat exchangers in the cooling chamber 1A, where they are cooled by changing over the downward direction circulating flow of the in-furnace atmosphere gas by a fan 5A and the upward direction circulating flow by a fan 5B at every fixed time. The temperature gradients in the upper and lower part of the tool steels are eliminated and the entire part are uniformly cooled; therefore, the defect that material quality assumes uneven structure is eliminated.
JP54154674A 1979-11-28 1979-11-28 heat treatment equipment Expired JPS5827324B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP54154674A JPS5827324B2 (en) 1979-11-28 1979-11-28 heat treatment equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP54154674A JPS5827324B2 (en) 1979-11-28 1979-11-28 heat treatment equipment

Publications (2)

Publication Number Publication Date
JPS5677324A true JPS5677324A (en) 1981-06-25
JPS5827324B2 JPS5827324B2 (en) 1983-06-08

Family

ID=15589417

Family Applications (1)

Application Number Title Priority Date Filing Date
JP54154674A Expired JPS5827324B2 (en) 1979-11-28 1979-11-28 heat treatment equipment

Country Status (1)

Country Link
JP (1) JPS5827324B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59159926A (en) * 1983-02-28 1984-09-10 Shimadzu Corp Method and device for heat treatment
JPS59159927A (en) * 1983-02-28 1984-09-10 Shimadzu Corp Heat treating device
KR20010007913A (en) * 2000-10-23 2001-02-05 채윤기 The reinforcing of hardness and a cooling method solving a change of color using nitrogen gas in a heat treatment progress

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52156112A (en) * 1976-06-18 1977-12-26 Alco Standard Corp Furnace for heat treatment and method of heatttreating therewith

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52156112A (en) * 1976-06-18 1977-12-26 Alco Standard Corp Furnace for heat treatment and method of heatttreating therewith

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59159926A (en) * 1983-02-28 1984-09-10 Shimadzu Corp Method and device for heat treatment
JPS59159927A (en) * 1983-02-28 1984-09-10 Shimadzu Corp Heat treating device
KR20010007913A (en) * 2000-10-23 2001-02-05 채윤기 The reinforcing of hardness and a cooling method solving a change of color using nitrogen gas in a heat treatment progress

Also Published As

Publication number Publication date
JPS5827324B2 (en) 1983-06-08

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