KR101852402B1 - Driving control method of nitrocarburizing and carburizing heat treatment apparatus - Google Patents

Driving control method of nitrocarburizing and carburizing heat treatment apparatus Download PDF

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KR101852402B1
KR101852402B1 KR1020180010343A KR20180010343A KR101852402B1 KR 101852402 B1 KR101852402 B1 KR 101852402B1 KR 1020180010343 A KR1020180010343 A KR 1020180010343A KR 20180010343 A KR20180010343 A KR 20180010343A KR 101852402 B1 KR101852402 B1 KR 101852402B1
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chamber
heat treatment
heating
softening
door
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KR1020180010343A
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Korean (ko)
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남용호
최만호
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(주)청호열처리
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    • 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
    • C21D9/0006—Details, accessories not peculiar to any of the following furnaces
    • 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
    • C21D1/76—Adjusting the composition of the atmosphere
    • 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
    • C21D1/773—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material under reduced pressure or vacuum
    • 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
    • F27B17/00—Furnaces of a kind not covered by any preceding group
    • F27B17/0016—Chamber type furnaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D15/00—Handling or treating discharged material; Supports or receiving chambers therefor
    • F27D15/02—Cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/001—Extraction of waste gases, collection of fumes and hoods used therefor
    • F27D17/002—Details of the installations, e.g. fume conduits or seals
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D7/00—Forming, maintaining, or circulating atmospheres in heating chambers
    • F27D7/06—Forming or maintaining special atmospheres or vacuum within heating chambers
    • 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
    • F27B17/00—Furnaces of a kind not covered by any preceding group
    • F27B17/0016—Chamber type furnaces
    • F27B2017/0091—Series of chambers, e.g. associated in their use
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D7/00—Forming, maintaining, or circulating atmospheres in heating chambers
    • F27D7/06—Forming or maintaining special atmospheres or vacuum within heating chambers
    • F27D2007/066—Vacuum

Abstract

The present invention relates to a method for controlling an operation of a nitrocarburizing and carburizing heat treatment apparatus. The method comprises: a heat treatment material preparation step; a heat treatment material charging step; a charging chamber vacuum exhaustion step; a charging chamber pressure recovery step; a heat treatment material heating chamber movement step; a heat treatment material heating step; a carburizing or nitrocarburizing step; a heat treatment material charging chamber movement step; a charging chamber vacuum exhaustion step; a charging chamber pressure recovery step; a heat treatment material hardening step; and a heat treatment material withdrawal step. A heat treatment material can be more stably treated. Moreover, the occurrence of negligent accidents can be prevented.

Description

연질화 및 침탄 열처리장치의 운전제어방법 { DRIVING CONTROL METHOD OF NITROCARBURIZING AND CARBURIZING HEAT TREATMENT APPARATUS }TECHNICAL FIELD [0001] The present invention relates to a control method of a softening and carburizing heat treatment apparatus,

본 발명은 연질화 및 침탄 열처리장치의 운전제어방법에 관한 것으로, 더 자세하게는 장입실과 가열실 사이에 격리실이 마련된 형태의 연질화 및 침탄 열처리장치에서 열처리물을 장입실로 장입한 후 장입실의 내부로 유입된 공기를 퍼지하고 질소를 충전 복압하는 것에 관한 것이다.The present invention relates to a method for controlling the operation of a softening and carburizing heat treatment apparatus, and more particularly, to a method for controlling the operation of a softening and carburizing heat treatment apparatus in which a heat treatment material is charged into a furnace chamber in a softening and carburizing heat treatment apparatus, To purge the air that has flowed into the interior of the furnace and to charge and pressurize the nitrogen.

일반적으로 열처리는 소재부품에 가열, 냉각에 의한 조직 제어를 통해 금속 또는 합금에 요구되는 강도, 경도, 내마모성, 내피로성, 내충격성, 가공성, 자성 등 여러 가지 성능을 개선하기 위해 필요한 생산 기술이며, 생산기반산업으로 공정 프로세스 중 가장 마지막 단계와 핵심 부분에 해당하므로 모든 산업 특히, 금속산업에 대한 파급효과가 막대하다.In general, heat treatment is a production technology required to improve various properties such as strength, hardness, abrasion resistance, fatigue resistance, impact resistance, workability and magnetic properties required for metal or alloy through controlling the structure by heating and cooling the material parts. As a production-based industry, it is the last stage and key part of the process, so the impact on all industries, especially the metal industry, is enormous.

도 1은 종래의 전형적인 연질화 및 침탄 열처리장치의 구성도이다.1 is a block diagram of a typical conventional softening and carburizing heat treatment apparatus.

도 1에 도시된 종래의 전형적인 연질화 및 침탄 열처리장치는 장입실(20)과 가열실(10)의 사이에 가스유동구멍(31)이 마련된 내부 단열도아(30)가 설치된 형태이다.The conventional softening and carburizing heat treatment apparatus shown in FIG. 1 is a type in which an inner heat insulating door 30 having a gas flow hole 31 is provided between a furnace inlet chamber 20 and a heating chamber 10.

종래의 전형적인 연질화 및 침탄 열처리장치에서 장입실(20)과 가열실(10)은 모두 대기압력(상압)상태를 유지한다.In the conventional typical softening and carburizing heat treatment apparatus, both the entering chamber 20 and the heating chamber 10 maintain the atmospheric pressure (atmospheric pressure) state.

도 2는 종래 기술에 따른 연질화 및 침탄 열처리장치의 운전제어방법의 공정순서도이다.2 is a flow chart of a process for controlling the operation of the softening and carburizing heat treatment apparatus according to the prior art.

종래의 전형적인 침탄 열처리장치의 운전제어방법은,.A conventional operation control method of a carburizing heat treatment apparatus is as follows.

장입실 도아(40)의 입구측에 마련되는 장입장치(210)의 상부에 열처리물(P)을 준비하는 단계;Preparing a heat treatment product (P) on an upper part of a charging device (210) provided at an entrance side of the entrance door (40);

외부공기의 유입을 막기 위해 화염커튼(flame curtain)을 작동한 상태에서 장입실 도아(40)를 개방하여 열처리물(P)을 장입하는 단계;Opening the entry door (40) with a flame curtain in operation to prevent entry of outside air and charging the heat treated product (P);

장입실(20)과 가열실(10) 사이의 내부 단열도아(30)를 열고 가열실(10)로 열처리물(P)을 이동시키는 단계;Moving the heat treated material (P) to the heating chamber (10) by opening an internal heat insulating door (30) between the entering chamber (20) and the heating chamber (10)

내부 단열도아(30)를 닫고, 가열실(10)에 분위기가스(Rx가스)를 흘려주면서 열처리물(P)을 가열하는 단계;Heating the heat-treated product (P) while closing the internal heat insulating door (30) and flowing an atmospheric gas (Rx gas) into the heating chamber (10);

열처리물(P)에 대한 가열이 완료되면 공정가스(탄화수소계, 암모니아)를 가열실(10)에 공급하여 연질화 열처리 또는 침탄 열처리를 하는 단계;A step of supplying a process gas (hydrocarbon system, ammonia) to the heating chamber (10) and performing a softening heat treatment or a carburizing heat treatment upon completion of heating the heat-treated product (P);

열처리물(P)에 대한 연질화 열처리 또는 침탄 열처리가 완료되면 내부 단열도아(30)를 열고, 열처리물(P)을 장입실(20)로 이동시키는 단계;When the softening heat treatment or the carburizing heat treatment for the heat treatment P is completed, opening the inner heat insulating door 30 and moving the heat treated product P to the entry chamber 20;

장입실(20)로 이동된 열처리물(P)을 장입실(20) 하부에 마련된 냉각실(50)을 통해 가스냉각(연질화)하거나 유냉각(침탄, 침탄질화)하여 경화시키는 단계;(Softening) or cooling (carburizing, carbo-nitriding) the heat-treated material P moved to the furnace inlet chamber 20 through the cooling chamber 50 provided in the furnace chamber 20 and curing the heat-treated product P;

열처리물(P)의 경화가 완료되면 외부공기의 유입을 막기 위해 화염커튼(flame curtain)을 작동한 상태에서 장입실 도아(40)를 개방하고 열처리물(P)을 꺼내는 단계;를 포함한다.After completion of the curing of the heat treatment product P, opening the entry door 40 and removing the heat treatment product P with the flame curtain in operation to prevent inflow of outside air.

상기 가열실(10)에서 열처리물을 가열하는 단계에서 가열중의 분해되거나 분해되지 않는 가스들은 내부 단열도아(30)의 가스유동구멍(31)를 통해서 장입실(20) 내부를 채우게 되고, 장입실(20)에 채워진 가스들은 연소탑(60)을 통해서 태워져서 최종적으로 대기중으로 방출된다.In the step of heating the heat-treated material in the heating chamber 10, the decomposed or non-decomposed gases in the heating are filled in the entrances into the entrances 20 through the gas flow holes 31 of the internal heat insulating door 30, The gases filled in the inlet 20 are burned through the combustion tower 60 and finally discharged into the atmosphere.

대한민국 등록특허공보 제10-1735628호 (2017년 05월 08일 등록)Korean Registered Patent No. 10-1735628 (registered on May 08, 2017) 일본 공개특허공보 제2009-299122호 (2009년 12월 24일 공개)Japanese Patent Application Laid-Open No. 2009-299122 (published on December 24, 2009)

종래 기술에 따른 연질화 및 침탄 열처리장치의 운전제어방법은 열처리물(P)을 장입실(20)에 장입하거나 장입실(20)에서 외부로 인출할 때에 도 3과 같이 외부공기의 유입을 막기 위해 화염커튼(flame curtain)을 작동하기 때문에 에너지가 소모될 뿐 아니라 화염커튼의 오작동에 따른 화재의 위험이나 작업자의 부상, 그밖의 각종 안전사고가 유발되는 문제가 있었다.The method of controlling the operation of the softening and carburizing heat treatment apparatus according to the related art prevents the inflow of external air as shown in FIG. 3 when the heat treatment P is charged into the entry chamber 20 or taken out from the entrance chamber 20 The operation of the flame curtain for the flame curtain is not only energy consuming but also causes a risk of fire due to the malfunction of the flame curtain, an injury of the operator, and other safety accidents.

본 발명은 상기 종래 기술에 따른 연질화 및 침탄 열처리장치의 운전제어방법의 문제점을 해결하기 위한 것으로, 그 목적이 장입실에 열처리물을 장입하거나 장입실에서 열처리물을 인출할 때에 화염커튼을 사용하지 않는 것에 의해 화재나 작업자의 부상, 그밖의 안전사고의 발생이 없도록 하고, 열처리물을 보다 안정적으로 연질화 열처리 또는 침탄 열처리할 수 있도록 하는 연질화 및 침탄 열처리장치의 운전제어방법을 제공하는 데에 있는 것이다.The object of the present invention is to provide a method for controlling the operation of a softening and carburizing heat treatment apparatus using the flame curtain when the heat treatment material is charged into the inlet chamber or the heat treatment material is taken out from the inlet chamber. The present invention provides a method of controlling the operation of a softening and carburizing heat treatment apparatus capable of performing softening heat treatment or carburizing heat treatment more stably so as not to cause fire or injury of workers or other safety accidents .

상기한 바와 같은 목적을 달성하기 위하여, 본 발명에 따른 연질화 및 침탄 열처리장치의 운전제어방법은 장입실과 가열실의 사이에 격리실이 마련되고, 장입실의 입구측을 밀폐하는 제1진공도아; 격리실의 입구측을 밀폐하는 제2진공도아; 가열실의 입구측을 밀폐하는 단열도아;를 포함하는 연질화 및 침탄 열처리장치의 운전제어방법으로, 장입실의 제1진공도아의 입구측에 마련되는 장입장치의 상부에 열처리물을 준비하는 단계; 장입실 입구측의 제1진공도아를 개방하여 열처리물을 장입실에 장입하는 단계; 제1진공도아를 닫고, 장입실의 내부공기를 진공배기하는 단계; 장입실에 질소를 충전하여 장입실의 압력을 회복시키는 단계; 격리실의 제2진공도아와 가열실의 단열도아를 개방한 후 가열실로 열처리물을 이동하는 단계; 제2진공도아와 단열도아를 닫고, 가열실에 질소가스를 흘려주면서 열처리물을 가열하는 단계; 열처리물에 대한 가열이 완료되면 공정가스를 가열실에 공급하여 연질화 열처리 또는 침탄 열처리를 하는 단계; 열처리물에 대한 연질화 열처리 또는 침탄 열처리가 완료되면 내부 단열도아과 제2진공도아를 열고, 열처리물을 장입실로 이동시키는 단계; 내부 단열도아와 제2진공도아를 닫고, 장입실의 내부공기를 진공배기하는 단계; 장입실에 질소를 충전하여 장입실의 압력을 회복시키는 단계; 장입실로 이동된 열처리물을 장입실 하부에 마련된 냉각실을 통해 가스냉각하거나 유냉각하여 경화시키는 단계; 열처리물의 경화가 완료되면 장입실의 제1진공도아를 개방하고 열처리물을 꺼내는 단계;를 포함하는 것을 특징으로 한다.In order to accomplish the above object, the present invention provides a method for controlling operation of a softening and carburizing heat treatment apparatus, comprising: providing an isolation chamber between a furnace chamber and a heating chamber; a first vacuum furnace for sealing the inlet side of the furnace chamber; ; A second vacuum port for sealing the inlet side of the isolation chamber; A method of controlling an operation of a softening and carburizing heat treatment apparatus comprising the steps of: preparing a heat treatment material on an upper part of a charging device provided on an inlet side of a first vacuum door in a charging chamber; ; Opening the first vacuum port on the inlet side of the inlet chamber to charge the heat treatment product into the inlet chamber; Closing the first vacuum door and evacuating the internal air in the entering chamber; Filling the inlet chamber with nitrogen to restore the inlet chamber pressure; Opening the second vacuum door of the isolation chamber and the insulating door of the heating chamber, and then moving the heat treatment object to the heating chamber; Heating the heat treatment material while closing the second vacuum door and the heat insulating door and flowing nitrogen gas into the heating chamber; Supplying the process gas to the heating chamber and performing a softening heat treatment or a carburizing heat treatment when the heating of the heat treatment product is completed; Opening the inner heat insulating door and the second vacuum door after completing the softening heat treatment or the carburizing heat treatment on the heat treatment material, and moving the heat treatment material to the entry chamber; Closing the inner heat insulating door and the second vacuum door, and evacuating the internal air in the entering room; Filling the inlet chamber with nitrogen to restore the inlet chamber pressure; A step of gas-cooling or liquefying the heat-treated material moved into the furnace chamber through a cooling chamber provided in the furnace chamber and curing the furnace; And a step of opening the first vacuum door of the entry chamber and taking out the heat treatment article when the hardening of the heat treatment article is completed.

본 발명에 따른 연질화 및 침탄 열처리장치의 운전제어방법은 연질화 및 침탄 열처리장치의 장입실에 제1배기유로와 제2배기유로, 그리고 질소공급유로가 마련되고, 제1배기유로에 제1배기밸브와 로터리 진공펌프가 설치되고, 제2배기유로에 제2배기밸브와 미케니컬부스터펌프가 설치되고, 미케니컬부스터펌프의 토출유로가 로터리 진공펌프와 접속되고, 로터리 진공펌프의 토출유로가 연소탑과 접속되고, 제1질소공급유로에 제1질소공급밸브가 설치되고, 장입실의 내부공기를 진공배기하는 단계가 로터리 진공펌프와 접속된 제1배기유로의 제1배기밸브를 개방하고, 로터리 진공펌프를 작동시켜 장입실의 내부를 안정시키는 단계; 제1배기밸브를 닫고, 미케니컬부스터펌프와 접속된 제2배기유로의 제2배기밸브를 열고 미케니컬부스터펌프와 로터리 진공펌프를 동작시켜 장입실의 내부 압력을 감압 조절한 후 제2배기밸브를 닫는 단계;를 포함하는 것을 특징으로 한다.A method for controlling the operation of a softening and carburizing heat treatment apparatus according to the present invention is characterized in that a first exhaust passage, a second exhaust passage and a nitrogen supply passage are provided in a take-in chamber of a softening and carburizing heat treatment apparatus, A second exhaust valve and a mechanical booster pump are provided in the second exhaust passage, a discharge passage of the mechanical booster pump is connected to the rotary vacuum pump, and the discharge of the rotary vacuum pump Wherein the first nitrogen supply valve is provided in the first nitrogen supply passage and the step of evacuating the internal air in the entrances is performed by the first exhaust valve of the first exhaust passage connected to the rotary vacuum pump And operating the rotary vacuum pump to stabilize the interior of the entry chamber; The first exhaust valve is closed, the second exhaust valve of the second exhaust passage connected to the mechanical booster pump is opened, the mechanical booster pump and the rotary vacuum pump are operated to adjust the internal pressure of the intake chamber to be reduced, And closing the exhaust valve.

본 발명에 따른 연질화 및 침탄 열처리장치의 운전제어방법은 장입실에 질소를 충전하여 장입실의 압력을 회복시키는 단계가 제1질소공급유로의 제1질소공급밸브를 열어 장입실에 질소를 채워 복압시키는 것을 특징으로 한다.In the method of controlling the operation of the softening and carburizing heat treatment apparatus according to the present invention, the step of filling nitrogen in the inlet chamber and restoring the pressure in the inlet chamber opens the first nitrogen supply valve of the first nitrogen supply channel to fill the inlet chamber with nitrogen And pressurized.

본 발명에 따른 연질화 및 침탄 열처리장치의 운전제어방법은 가열실에 공정가스공급유로와 제2질소공급유로, 그리고 제3배기유로가 마련되고, 공정가스공급유로에 공정가스공급밸브이 설치되고, 제2질소공급유로에 제2질소공급밸브가 설치되고, 제3배기유로에 연소탑이 설치되고, 가열실에서 열처리물을 가열하는 단계에서 열처리물의 가열중에 분해되거나 분해되지 않는 가스들이 제3배기유로을 통해 연소탑으로 배기된 후 연소탑에서 태워져서 최종적으로 대기중으로 방출되는 것을 특징으로 한다.The method for controlling the operation of the softening and carburizing heat treatment apparatus according to the present invention is characterized in that the heating chamber is provided with a process gas supply passage, a second nitrogen supply passage and a third exhaust passage, a process gas supply valve is provided in the process gas supply passage, A second nitrogen supply valve is provided in the second nitrogen supply passage, a combustion tower is provided in the third exhaust passage, gases which are not decomposed or decomposed during the heating of the heat treatment product in the step of heating the heat treatment product in the heating chamber, Is discharged to the combustion tower through the flow path, burned in the combustion tower, and finally discharged into the atmosphere.

본 발명에 따른 연질화 및 침탄 열처리장치의 운전제어방법은 연질화 및 침탄 열처리장치에서 가열실의 가열방식이 전기저항 가열방식이나 가스버너에 의한 방식인 것을 특징으로 한다.The operation control method of the softening and carburizing heat treatment apparatus according to the present invention is characterized in that the heating method of the heating chamber in the softening and carburizing heat treatment apparatus is an electric resistance heating method or a gas burner method.

본 발명에 따른 연질화 및 침탄 열처리장치의 운전제어방법에 의하면, 열처리를 해야할 열처리물을 장입실에 장입하거나 열처리가 완료된 열처리물을 장입실에서 외부로 인출할 때에 화염커튼을 사용하지 않기 때문에 화염커튼으로 인한 화재의 위험이나 작업자의 부상, 그밖의 각종 안전사고의 우려가 없게 된다.According to the operation control method of the softening and carburizing heat treatment apparatus according to the present invention, since the flame curtain is not used when the heat treatment material to be heat-treated is charged into the entry chamber or the heat-treated material after the heat treatment is taken out from the entrance chamber, There is no risk of fire due to the curtain, injury of the operator, and other safety accidents.

도 1은 종래의 전형적인 연질화 및 침탄 열처리장치의 구성도,
도 2는 종래 기술에 따른 연질화 및 침탄 열처리장치의 운전제어방법의 공정순서도,
도 3은 종래 기술에 따른 연질화 및 침탄 열처리장치의 운전제어방법의 화염커튼 작동상태도,
도 4는 본 발명이 관계하는 연질화 및 침탄 열처리장치의 구성도,
도 5는 본 발명이 관계하는 연질화 및 침탄 열처리장치의 평면도,
도 6는 본 발명에 따른 연질화 및 침탄 열처리장치의 운전제어방법의 공정순서도,
도 7a 및 도 7b는 본 발명이 관계하는 연질화 및 침탄 열처리장치의 가열실의 가열 예시도.1 is a schematic view of a conventional softening and carburizing heat treatment apparatus,
FIG. 2 is a flow chart of a process for controlling the operation of a softening and carburizing heat treatment apparatus according to the prior art,
FIG. 3 is a state in which the flame curtain is operated in the operation control method of the softening and carburizing heat treatment apparatus according to the prior art,
4 is a configuration diagram of a softening and carburizing heat treatment apparatus to which the present invention is related,
5 is a plan view of the softening and carburizing heat treatment apparatus to which the present invention is concerned,
FIG. 6 is a flow chart of a process for controlling the operation of the softening and carburizing heat treatment apparatus according to the present invention,
7A and 7B are heating examples of heating chambers of a softening and carburizing heat treatment apparatus to which the present invention is related.

이하 본 발명에 따른 연질화 및 침탄 열처리장치의 운전제어방법을 첨부된 도면에 의거하여 상세하게 설명하면 다음과 같다.DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an operation control method of a softening and carburizing heat treatment apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

이하에서, "상방", "하방", "전방" 및 "후방" 및 그 외 다른 방향성 용어들은 도면에 도시된 상태를 기준으로 정의한다.In the following, the terms "upward", "downward", "forward" and "rearward" and other directional terms are defined with reference to the states shown in the drawings.

도 4는 본 발명이 관계하는 연질화 및 침탄 열처리장치의 구성도이고, 도 5는 본 발명이 관계하는 연질화 및 침탄 열처리장치의 평면도이다.Fig. 4 is a configuration diagram of the softening and carburizing heat treatment apparatus to which the present invention is related, and Fig. 5 is a plan view of the softening and carburizing heat treatment apparatus to which the present invention is concerned.

도 4 및 도 5와 같이 본 발명이 관계하는 연질화 및 침탄 열처리장치(100)는 장입실(120)과 가열실(110)의 사이에 격리실(130)이 마련되는 형태이다.4 and 5, the softening and carburizing heat treatment apparatus 100 according to the present invention is a type in which a separation chamber 130 is provided between a gettering chamber 120 and a heating chamber 110.

본 발명이 관계하는 연질화 및 침탄 열처리장치(100)는 장입실(120)의 입구측을 밀폐하는 제1진공도아(140); 격리실(130)의 입구측을 밀폐하는 제2진공도아(150); 가열실(110)의 입구측을 밀폐하는 단열도아(160);를 포함한다.A softening and carburizing heat treatment apparatus (100) according to the present invention includes a first vacuum door (140) for sealing an inlet side of a entrant chamber (120); A second vacuum door 150 for sealing the inlet side of the isolation chamber 130; And an insulating door (160) for sealing the inlet side of the heating chamber (110).

장입실(120)에는 제1배기유로(121)와 제2배기유로(122), 그리고 질소공급유로(123)가 마련되고, 제1배기유로(121)에는 제1배기밸브(AV1)와 로터리 진공펌프(RP1)가 설치되고, 제2배기유로(122)에는 제2배기밸브(AV2)와 미케니컬부스터펌프(MP2)가 설치되고, 미케니컬부스터펌프(MP2)의 토출유로는 로터리 진공펌프(RP1)와 접속되고, 로터리 진공펌프(RP1)의 토출유로는 연소탑(180)과 접속된다.A first exhaust passage 121 and a second exhaust passage 122 and a nitrogen supply passage 123 are provided in the intake chamber 120. The first exhaust valve AV1 and the rotary valve The second exhaust valve AV2 and the mechanical booster pump MP2 are installed in the second exhaust passage 122 and the discharge passage of the mechanical booster pump MP2 is provided in the rotary And the discharge passage of the rotary vacuum pump RP1 is connected to the combustion tower 180. [

제1질소공급유로(123)에는 제1질소공급밸브(NV1)가 설치된다.The first nitrogen supply valve 123 is provided with a first nitrogen supply valve NV1.

가열실(110)에는 공정가스공급유로(111)와 제2질소공급유로(112), 그리고 제3배기유로(113)가 마련되고, 공정가스공급유로(111)에는 공정가스공급밸브(DV1)이 설치되고, 제2질소공급유로(112)에는 제2질소공급밸브(NV2)가 설치되고, 제3배기유로(113)에는 연소탑(180)이 설치된다.The heating chamber 110 is provided with a process gas supply passage 111, a second nitrogen supply passage 112 and a third exhaust passage 113. A process gas supply valve DV1 is connected to the process gas supply passage 111, A second nitrogen supply valve NV2 is provided in the second nitrogen supply passage 112 and a combustion tower 180 is provided in the third exhaust passage 113. [

도 6은 본 발명에 따른 연질화 및 침탄 열처리장치의 운전제어방법의 공정순서도이다.6 is a process flow chart of a method of controlling the operation of the softening and carburizing heat treatment apparatus according to the present invention.

본 발명에 따른 연질화 및 침탄 열처리장치의 운전제어방법은The operation control method of the softening and carburizing heat treatment apparatus according to the present invention

장입실(120)의 제1진공도아(140)의 입구측에 마련되는 장입장치(210)의 상부에 열처리물(P)을 준비하는 단계;Preparing a heat treatment product P on the charging device 210 provided at the entrance side of the first vacuum door 140 of the entry chamber 120;

장입실(120) 입구측의 제1진공도아(140)를 개방하여 열처리물(P)을 장입실(120)에 장입하는 단계;Opening the first vacuum door (140) at the entry side of the entry chamber (120) and loading the heat treated article (P) into the entry chamber (120);

제1진공도아(140)를 닫고, 장입실(120)의 내부공기를 진공배기하는 단계;Closing the first vacuum door (140) and evacuating the internal air in the entry chamber (120);

장입실(120)에 질소를 충전하여 장입실(120)의 압력을 회복시키는 단계;Charging nitrogen into the entry chamber 120 to restore the pressure in the entry chamber 120;

격리실(130)의 제2진공도아(150)와 가열실(110)의 단열도아(160)를 개방한 후 가열실(110)로 열처리물(P)을 이동하는 단계;Opening the second vacuum door 150 of the isolation chamber 130 and the insulation door 160 of the heating chamber 110 and moving the heat treatment P to the heating chamber 110;

제2진공도아(150)와 단열도아(160)를 닫고, 가열실(110)에 질소가스(N2)를 흘려주면서 열처리물(P)을 가열하는 단계;Heating the heat treated material P while closing the second vacuum door 150 and the heat insulating door 160 and flowing nitrogen gas N 2 into the heating chamber 110;

열처리물(P)에 대한 가열이 완료되면 공정가스(탄화수소계, 암모니아)를 가열실(110)에 공급하여 연질화 열처리 또는 침탄 열처리를 하는 단계;Supplying a process gas (hydrocarbon-based or ammonia) to the heating chamber 110 to perform a softening heat treatment or a carburizing heat treatment upon completion of heating the heat-treated product P;

열처리물(P)에 대한 열처리가 완료되면 내부 단열도아(160)과 제2진공도아(150)를 열고, 열처리물(P)을 장입실(120)로 이동시키는 단계;Opening the inner heat insulating door (160) and the second vacuum door (150) and moving the heat treated product (P) to the entry chamber (120) when the heat treatment for the heat treated product (P) is completed;

내부 단열도아(160)와 제2진공도아(150)를 닫고, 장입실(120)의 내부공기를 진공배기하는 단계;Closing the inner heat insulating door (160) and the second vacuum door (150) and evacuating the internal air in the entry chamber (120);

장입실(120)에 질소를 충전하여 장입실(120)의 압력을 회복시키는 단계;Charging nitrogen into the entry chamber 120 to restore the pressure in the entry chamber 120;

장입실(120)로 이동된 열처리물(P)을 장입실(120) 하부에 마련된 냉각실(170)을 통해 가스냉각(연질화)하거나 유냉각(침탄, 침탄질화)하여 경화시키는 단계;(Softening) or cooling (carburizing, carbo-nitriding) the heat-treated P moved to the entering chamber 120 through the cooling chamber 170 provided under the entering chamber 120 to cure the heat-

열처리물(P)의 경화가 완료되면 장입실(120)의 제1진공도아(140)를 개방하고 열처리물(P)을 꺼내는 단계;를 포함한다.After the curing of the heat treatment P is completed, the first vacuum door 140 of the entry chamber 120 is opened and the heat treatment P is taken out.

상기에서 장입실(120)의 내부공기를 진공배기하는 단계는 The step of evacuating the inside air of the entrances 120

로터리 진공펌프(RP1)와 접속된 제1배기유로(121)의 제1배기밸브(AV1)를 개방하고, 로터리 진공펌프(RP1)를 일정시간(예를 들면 5~7분 정도) 작동시켜 장입실(120)의 내부를 안정시키는 단계;The first exhaust valve AV1 of the first exhaust passage 121 connected to the rotary vacuum pump RP1 is opened and the rotary vacuum pump RP1 is operated for a predetermined time (for example, 5 to 7 minutes) Stabilizing the interior of the inlet chamber 120;

제1배기밸브(AV1)를 닫고, 미케니컬부스터펌프(MP2)와 접속된 제2배기유로(122)의 제2배기밸브(AV2)를 열고 미케니컬부스터펌프(MP2)와 로터리 진공펌프(RP1)를 동작시켜 장입실(120)의 내부 압력을 일정범위(예를 들면 991~998mbar)로 감압 조절한 후 제2배기밸브(AV2)를 닫는 단계;를 포함한다.The first exhaust valve AV1 is closed and the second exhaust valve AV2 of the second exhaust passage 122 connected to the mechanical booster pump MP2 is opened and the mechanical booster pump MP2 and the rotary vacuum pump MP2 are opened. Closing the second exhaust valve AV2 after operating the internal combustion engine RP1 to regulate the internal pressure of the intake chamber 120 to a predetermined range (for example, 991 to 998 mbar), and then closing the second exhaust valve AV2.

장입실(120)에 질소를 충전하여 장입실(120)의 압력을 회복시키는 단계는 제1질소공급유로(123)의 제1질소공급밸브(NV1)를 열어 장입실(120)에 질소를 채워 복압시킨다.In the step of filling nitrogen in the inlet chamber 120 and restoring the pressure in the inlet chamber 120, the first inlet valve NV1 of the first nitrogen supply channel 123 is opened to fill the inlet chamber 120 with nitrogen Pressurize.

이때 이때 장입실(120)에 충전되는 질소 압력이 10mbar 이상이면 진공펌프를 작동하고 7mbar이하이면 진공펌프의 작동을 정지한다.At this time, if the nitrogen pressure charged in the entry chamber 120 is 10 mbar or more, the vacuum pump is operated and if the pressure is 7 mbar or less, the operation of the vacuum pump is stopped.

가열실(110)에서 열처리물을 가열하는 단계에서 열처리물(P)의 가열중에 분해되거나 분해되지 않는 가스들은 제3배기유로(113)을 통해 연소탑(180)으로 배기된 후 연소탑(180)에서 태워져서 최종적으로 대기중으로 방출된다.Gases which are not decomposed or decomposed during the heating of the heat-treated product P in the step of heating the heat-treated product in the heating chamber 110 are exhausted to the combustion tower 180 through the third exhaust gas passage 113, ) And finally released into the atmosphere.

도 7a 및 도 7b는 본 발명이 관계하는 연질화 및 침탄 열처리장치의 가열실의 가열 예시도이다.7A and 7B are heating examples of heating chambers of a softening and carburizing heat treatment apparatus to which the present invention is related.

연질화 및 침탄 열처리장치(100)에서 가열실(110)의 가열방식은 도 7a와 같은 전기저항 가열방식이나 도 7b와 같은 가스버너에 의한 방식을 사용할 수 있다.In the softening and carburizing heat treatment apparatus 100, the heating chamber 110 may be heated by an electric resistance heating method as shown in FIG. 7A or by a gas burner as shown in FIG. 7B.

도 7a의 전기저항 가열방식은 라디안튜브 히터에 의한 가열방식으로 장치 구성 및 제어가 용이하지만 에너지 효율이 낮은 단점이 있다.The electric resistance heating method shown in FIG. 7A is a heating method using a radial tube heater, which is easy to configure and control, but has a disadvantage of low energy efficiency.

도 7b의 가스버너에 의한 방식은 전기저항 가열방식에 비해 제어가 용이하지 않지만 에너지 효율이 높은 장점이 있다.The method using the gas burner of FIG. 7B is not easy to control as compared with the electric resistance heating method, but has an advantage of high energy efficiency.

본 발명에 따른 연질화 및 침탄 열처리장치의 운전제어방법은 장입실(120)에 열처리물(P)을 장입한 후 제1진공도아(140)를 밀폐하고 장입실(120)의 내부 공기를 퍼지하고, 질소를 충전 복압함으로써 장입실(120) 내부로 유입된 외부 공기를 제거할 수 있게 되는 것으로, 가열실(110)에 외부 공기가 진입하여 열처리 분위기를 저해하는 것을 방지할 수 있게 된다.The method for controlling the operation of the softening and carburizing heat treatment apparatus according to the present invention is a method for controlling the operation of the softening and carburizing heat treatment apparatus according to the present invention by sealing the first vacuum door 140 after the heat treatment P is charged into the entering chamber 120, And the outside air introduced into the inlet chamber 120 can be removed by charging and pressurizing nitrogen, thereby preventing external air from entering the heating chamber 110 and hindering the heat treatment atmosphere.

본 발명에 따른 연질화 및 침탄 열처리장치의 운전제어방법은 종래 기술과 같이 가열실로 외부 공기가 유입되는 것을 방지하기 위해 화염커튼을 사용할 필요가 없기 때문에 에너지를 절감할 수 있게 됨은 물론 화재나 작업자의 부상, 그밖의 안전사고를 발생을 방지할 수 있게 된다.The operation control method of the softening and carburizing heat treatment apparatus according to the present invention does not require the use of a flame curtain to prevent the inflow of external air into the heating chamber as in the prior art, Injuries and other safety accidents can be prevented.

이상 본 발명자에 의해서 이루어진 발명을 상기 실시 예에 따라 구체적으로 설명하였지만, 본 발명은 상기 실시 예에 한정되는 것은 아니고 그 요지를 이탈하지 않는 범위에서 여러 가지로 변경 가능한 것은 물론이다.Although the present invention has been described in detail with reference to the above embodiments, it is needless to say that the present invention is not limited to the above-described embodiments, and various modifications may be made without departing from the spirit of the present invention.

100 : 연질화 및 침탄 열처리장치
110 : 가열실
120 : 장입실
130 : 격리실
140 : 제1진공도아
150 : 제2진공도아
160 : 단열도아100: Softening and carburizing heat treatment apparatus
110: heating chamber
120: Entering the hall
130: isolation chamber
140: First vacuum door
150: Second vacuum door
160: Insulation Doors

Claims (5)

장입실(120)과 가열실(110)의 사이에 격리실(130)이 마련되고,
장입실(120)의 입구측을 밀폐하는 제1진공도아(140); 격리실(130)의 입구측을 밀폐하는 제2진공도아(150); 가열실(110)의 입구측을 밀폐하는 단열도아(160);를 포함하는 연질화 및 침탄 열처리장치의 운전제어방법으로,
장입실(120)의 제1진공도아(140)의 입구측에 마련되는 장입장치(210)의 상부에 열처리물(P)을 준비하는 단계;
장입실(120) 입구측의 제1진공도아(140)를 개방하여 열처리물(P)을 장입실(120)에 장입하는 단계;
제1진공도아(140)를 닫고, 장입실(120)의 내부공기를 진공배기하는 단계;
장입실(120)에 질소를 충전하여 장입실(120)의 압력을 회복시키는 단계;
격리실(130)의 제2진공도아(150)와 가열실(110)의 단열도아(160)를 개방한 후 가열실(110)로 열처리물(P)을 이동하는 단계;
제2진공도아(150)와 단열도아(160)를 닫고, 가열실(110)에 질소가스(N2)를 흘려주면서 열처리물(P)을 가열하는 단계;
열처리물(P)에 대한 가열이 완료되면 공정가스를 가열실(110)에 공급하여 연질화 열처리 또는 침탄 열처리를 하는 단계;
열처리물(P)에 대한 열처리가 완료되면 내부 단열도아(160)과 제2진공도아(150)를 열고, 열처리물(P)을 장입실(120)로 이동시키는 단계;
내부 단열도아(160)와 제2진공도아(150)를 닫고, 장입실(120)의 내부공기를 진공배기하는 단계;
장입실(120)에 질소를 충전하여 장입실(120)의 압력을 회복시키는 단계;
장입실(120)로 이동된 열처리물(P)을 장입실(120) 하부에 마련된 냉각실(170)을 통해 가스냉각하거나 유냉각하여 경화시키는 단계;
열처리물(P)의 경화가 완료되면 장입실(120)의 제1진공도아(140)를 개방하고 열처리물(P)을 꺼내는 단계;를 포함하고,
연질화 및 침탄 열처리장치(100)의 장입실(120)에 제1배기유로(121)와 제2배기유로(122), 그리고 질소공급유로(123)가 마련되고, 제1배기유로(121)에 제1배기밸브(AV1)와 로터리 진공펌프(RP1)가 설치되고, 제2배기유로(122)에 제2배기밸브(AV2)와 미케니컬부스터펌프(MP2)가 설치되고, 미케니컬부스터펌프(MP2)의 토출유로가 로터리 진공펌프(RP1)와 접속되고, 로터리 진공펌프(RP1)의 토출유로가 연소탑(180)과 접속되고, 제1질소공급유로(123)에 제1질소공급밸브(NV1)가 설치되고,
장입실(120)의 내부공기를 진공배기하는 단계는,
로터리 진공펌프(RP1)와 접속된 제1배기유로(121)의 제1배기밸브(AV1)를 개방하고, 로터리 진공펌프(RP1)를 작동시켜 장입실(120)의 내부를 안정시키는 단계;
제1배기밸브(AV1)를 닫고, 미케니컬부스터펌프(MP2)와 접속된 제2배기유로(122)의 제2배기밸브(AV2)를 열고 미케니컬부스터펌프(MP2)와 로터리 진공펌프(RP1)를 동작시켜 장입실(120)의 내부 압력을 감압 조절한 후 제2배기밸브(AV2)를 닫는 단계;를 포함하는 것을 특징으로 하는 연질화 및 침탄 열처리장치의 운전제어방법.A separation chamber 130 is provided between the inlet chamber 120 and the heating chamber 110,
A first vacuum door (140) for sealing the entrance side of the entry chamber (120); A second vacuum door 150 for sealing the inlet side of the isolation chamber 130; And a heat insulating door (160) for sealing the inlet side of the heating chamber (110). The method for controlling the operation of the softening and carburizing heat treatment apparatus
Preparing a heat treatment product P on the charging device 210 provided at the entrance side of the first vacuum door 140 of the entry chamber 120;
Opening the first vacuum door (140) at the entry side of the entry chamber (120) and loading the heat treated article (P) into the entry chamber (120);
Closing the first vacuum door (140) and evacuating the internal air in the entry chamber (120);
Charging nitrogen into the entry chamber 120 to restore the pressure in the entry chamber 120;
Opening the second vacuum door 150 of the isolation chamber 130 and the insulation door 160 of the heating chamber 110 and moving the heat treatment P to the heating chamber 110;
Heating the heat treated material P while closing the second vacuum door 150 and the heat insulating door 160 and flowing nitrogen gas N 2 into the heating chamber 110;
Supplying the process gas to the heating chamber (110) and performing a softening heat treatment or a carburizing heat treatment upon completion of heating the heat treatment product (P);
Opening the inner heat insulating door (160) and the second vacuum door (150) and moving the heat treated product (P) to the entry chamber (120) when the heat treatment for the heat treated product (P) is completed;
Closing the inner heat insulating door (160) and the second vacuum door (150) and evacuating the internal air in the entry chamber (120);
Charging nitrogen into the entry chamber 120 to restore the pressure in the entry chamber 120;
(P) moved to the entry chamber (120) through the cooling chamber (170) provided in the lower entry chamber (120) and curing the gas by cooling or cooling it;
And opening the first vacuum door (140) of the entry chamber (120) and taking out the heat treated product (P) when the heat treatment (P) is cured,
The first exhaust passage 121 and the second exhaust passage 122 and the nitrogen supply passage 123 are provided in the entry chamber 120 of the softening and carburizing heat treatment apparatus 100. The first exhaust passage 121, The second exhaust valve AV2 and the mechanical booster pump MP2 are installed in the second exhaust passage 122 and the first exhaust valve AV1 and the rotary vacuum pump RP1 are provided in the second exhaust passage 122, The discharge passage of the booster pump MP2 is connected to the rotary vacuum pump RP1 and the discharge passage of the rotary vacuum pump RP1 is connected to the combustion tower 180. The first nitrogen supply passage 123 is connected to the first nitrogen A supply valve NV1 is provided,
The step of evacuating the internal air of the entrances 120 comprises:
Opening the first exhaust valve AV1 of the first exhaust passage 121 connected to the rotary vacuum pump RP1 and operating the rotary vacuum pump RP1 to stabilize the interior of the entry chamber 120;
The first exhaust valve AV1 is closed and the second exhaust valve AV2 of the second exhaust passage 122 connected to the mechanical booster pump MP2 is opened and the mechanical booster pump MP2 and the rotary vacuum pump MP2 are opened. Closing the second exhaust valve (AV2) by operating the first exhaust valve (RP1) to regulate the internal pressure of the entrances (120) to be reduced. 삭제delete 제1항에 있어서,
장입실(120)에 질소를 충전하여 장입실(120)의 압력을 회복시키는 단계는 제1질소공급유로(123)의 제1질소공급밸브(NV1)를 열어 장입실(120)에 질소를 채워 복압시키는 것을 특징으로 하는 연질화 및 침탄 열처리장치의 운전제어방법.The method according to claim 1,
In the step of filling nitrogen in the inlet chamber 120 and restoring the pressure in the inlet chamber 120, the first inlet valve NV1 of the first nitrogen supply channel 123 is opened to fill the inlet chamber 120 with nitrogen And controlling the operation of the softening and carburizing heat treatment apparatus. 제1항에 있어서,
가열실(110)에 공정가스공급유로(111)와 제2질소공급유로(112), 그리고 제3배기유로(113)가 마련되고, 공정가스공급유로(111)에 공정가스공급밸브(DV1)이 설치되고, 제2질소공급유로(112)에 제2질소공급밸브(NV2)가 설치되고, 제3배기유로(113)에 연소탑(180)이 설치되고,
가열실(110)에서 열처리물을 가열하는 단계에서 열처리물(P)의 가열중에 분해되거나 분해되지 않는 가스들이 제3배기유로(113)을 통해 연소탑(180)으로 배기된 후 연소탑(180)에서 태워져서 최종적으로 대기중으로 방출되는 것을 특징으로 하는 연질화 및 침탄 열처리장치의 운전제어방법.The method according to claim 1,
The heating chamber 110 is provided with a process gas supply passage 111 and a second nitrogen supply passage 112 and a third exhaust passage 113. A process gas supply valve DV1 is connected to the process gas supply passage 111, A second nitrogen supply valve NV2 is provided in the second nitrogen supply passage 112 and a combustion tower 180 is provided in the third exhaust passage 113,
Gases which are not decomposed or decomposed during the heating of the heat treated product P in the heating chamber 110 are exhausted to the combustion tower 180 through the third exhaust flow passage 113, ), And finally discharged into the atmosphere. The method of controlling operation of a softening and carburizing heat treatment apparatus according to claim 1, 제4항에 있어서,
연질화 및 침탄 열처리장치(100)에서 가열실(110)의 가열방식은 전기저항 가열방식이나 가스버너에 의한 방식인 것을 특징으로 하는 연질화 및 침탄 열처리장치의 운전제어방법.5. The method of claim 4,
A method for controlling the operation of a softening and carburizing heat treatment apparatus characterized in that the heating chamber (110) is heated by an electric resistance heating method or a gas burner in the softening and carburizing heat treatment apparatus (100).
KR1020180010343A 2018-01-29 2018-01-29 Driving control method of nitrocarburizing and carburizing heat treatment apparatus KR101852402B1 (en)

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