[미국특허]
METHOD FOR HEAT TREATMENT, HEAT TREATMENT APPARATUS, AND HEAT TREATMENT SYSTEM
원문보기
IPC분류정보
국가/구분
United States(US) Patent
공개
국제특허분류(IPC7판)
C21D-009/00
F27D-005/00
F27D-007/02
F27D-019/00
F27D-021/00
F27B-005/10
F27B-005/16
F27B-005/18
F27B-005/12
F27B-005/13
F27B-009/40
F27B-009/38
F27B-009/39
F27B-009/24
F27B-009/36
C21D-001/76
F27D-003/00
출원번호
US-0409080
(2017-01-18)
공개번호
US-0130287
(2017-05-11)
우선권정보
JP-2012-150239 (2012-07-04)
발명자
/ 주소
TAKAHASHI, Shinichi
KANDA, Kiichi
출원인 / 주소
TAKAHASHI, Shinichi
인용정보
피인용 횟수 :
0인용 특허 :
0
초록▼
A method for heat treatment, a heat treatment apparatus, and a heat treatment system that is capable of performing highly precise and efficient control of heat treatment. A heat treatment furnace has in-furnace structures made of graphite and has a heat-treatment chamber in which heat treatment of m
A method for heat treatment, a heat treatment apparatus, and a heat treatment system that is capable of performing highly precise and efficient control of heat treatment. A heat treatment furnace has in-furnace structures made of graphite and has a heat-treatment chamber in which heat treatment of materials to be treated is performed. A value of ΔG0 (standard formation Gibbs energy) is computed with reference to the sensor information from respective sensors, and an Ellingham diagram, a control range, and a status of the heat treatment furnace in operation expressed by ΔG0 are displayed on a display device. A control unit controls a flow rate of neutral gas or inactive gas as atmosphere gas or a flow velocity of the gas so that ΔG0 is within the control range.
대표청구항▼
1. A heat treatment apparatus for a heat treatment, which is at least one of a bright heat treatment, a thermal refining treatment, a hardening/tempering treatment, brazing, and sintering, comprising: a heat treatment furnace configured to heat-treat a material to be treated;a gas supply device comp
1. A heat treatment apparatus for a heat treatment, which is at least one of a bright heat treatment, a thermal refining treatment, a hardening/tempering treatment, brazing, and sintering, comprising: a heat treatment furnace configured to heat-treat a material to be treated;a gas supply device comprising a flow control valve for supplying atmosphere gas constituted of neutral gas or inactive gas to the heat treatment furnace;a control system configured to control a flow rate from the gas supply device by referring to sensor information from a plurality of sensors for detecting a status of heat treatment in the heat treatment furnace, anda terminal device that displays a display data via a communication line and transmits control information for controlling the control system;wherein the heat treatment furnace has in-furnace structures made of graphite such that the heat treatment can be carried out in a low-oxygen atmosphere gas,wherein the control system comprises:a standard formation Gibbs energy computation unit configured to calculate standard formation Gibbs energy (ΔG0) of the atmosphere gas in the heat treatment furnace in reaction of 2C+O2−2CO by referring to information from a CO sensor and a temperature sensor contained in the sensors, the CO sensor configured to sample a part of the atmosphere gas in the heat treatment furnace with a gas sampling device and to measure CO partial pressure inside the heat treatment furnace based on the sampled atmosphere gas; anda display data generation unit configured to use an Ellingham diagram corresponding to the material in the heat treatment furnace and the calculated standard formation Gibbs energy to generate the display data to be displayed on a display device, the display data generation unit generating the display data such that a status of the calculated standard formation Gibbs energy is displayed on the Ellingham diagram on a display screen of the display device and is updated in real time on the display screen; anda control unit configured to control the flow control valve of the gas supply device such that the calculated standard formation Gibbs energy falls within a control range set on the Ellingham diagram, andwherein the control range is in a region set below an approximate straight line as which standard formation Gibbs energy of the material to be treated at respective temperatures is displayed, and is in a region set below the approximate straight line as which standard formation Gibbs energy in the reaction of 2C+O2=2CO is displayed. 2. The heat treatment apparatus according to claim 1, wherein the material to be treated includes at least one of carbon steel, steel containing an alloy element, nickel (Ni), chromium (Cr), titanium (Ti), silicon (Si) and copper (Cu). 3. The heat treatment apparatus according to claim 1, wherein the control system is configured to calculate reduction finish time of the material to be treated based on time change in the standard formation Gibbs energy. 4. The heat treatment apparatus according to claim 1, further comprising: a conveyance mechanism that conveys a plurality of the materials to be treated in sequence in a longitudinal direction of the heat treatment furnace; andrespective sensors in a plurality of places along the longitudinal direction to detect the status of heat treatment to calculate the standard formation Gibbs energy,wherein the standard formation Gibbs energy is calculated in the respective places with reference to respective signals from the plurality of sensors, and a conveyance rate is controlled by the conveyance mechanism, or a flow rate of the neutral gas or inactive gas or a flow velocity of the gas is controlled, so that the calculated value falls within the control range. 5. The heat treatment apparatus according to claim 1, wherein the display data generation unit is configured to generate the display data including the control range in the Ellingham diagram. 6. The heat treatment apparatus according to claim 1, further comprising a heat treatment database that stores at least one of process information on the materials to be treated, log information about operation of the heat treatment apparatus, and accident information. 7. The heat treatment apparatus according to claim 1, wherein the control range includes: a first control range indicative of a normal operation range of the heat treatment furnace;a second control range outside the first control range; anda third control range outside the second control range,wherein the control system further comprises a status monitoring & abnormality processing unit configured to monitor the status of the calculated standard formation Gibbs energy on the Ellingham diagram, andwherein the status monitoring & abnormality processing unit is configured to output an alarm when the status of the calculated standard formation Gibbs energy on the Ellingham diagram deviates from the first control range, and to output control information so as to stop the operation of the heat treatment apparatus when the status of the calculated standard formation Gibbs energy on the Ellingham diagram shifts to the third control range. 8. The heat treatment apparatus according to claim 1, wherein the heat treatment furnace comprises:a tunnel-like graphite outer muffle formed from graphite, which is placed inside a hollow surrounded with a graphite heat insulator;a tunnel-like graphite inner muffle formed from graphite, an inside of the graphite inner muffle serving as a heat-treatment chamber in which heat treatment of the material to be treated is performed;a mesh belt made of a C/C composite material provided so as to be movable inside the heat-treatment chamber of the graphite inner muffle, the material to be treated being laid on the mesh belt; andgraphite heaters, which are placed outside the graphite inner muffle to heat the heat-treatment chamber, each of the graphite heaters being made to pass through the graphite outer muffle.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.