JP2011133114A5

JP2011133114A5 -

Info

Publication number: JP2011133114A5
Application number: JP2009289943A
Authority: JP
Filing date: 2009-12-22
Publication date: 2012-06-21
Anticipated expiration: 2029-12-22

Description

上記目的を達成するために、本第１発明では、台車上にワークを積載して炉内へ出し入れすることにより熱処理とこの間の冷却を行なうバッチ式熱処理炉において、第１熱処理工程と、これに続く第２熱処理工程との間の熱処理間時間を決定する方法であって、第２熱処理工程の開始温度が第１熱処理工程の終了温度よりも低い場合には、開始温度と終了温度の差を、炉の大きさに応じて予め定められた炉冷却速度で除した値を台車冷却時間とする一方、第２熱処理工程の開始温度が第１熱処理工程の終了温度以上の場合には前記台車冷却時間を０に設定するステップと、前記台車冷却時間が、ワーク冷却方法に応じて予め定められた追加時間よりも大きい場合には前記台車冷却時間と台車への積込み時間の和を前記熱処理間時間として決定する一方、前記台車冷却時間が前記追加時間以下の場合には当該追加時間と前記積込み時間の和を前記熱処理間時間として決定するステップとを備える。 In order to achieve the above object, according to the first aspect of the present invention, in a batch type heat treatment furnace in which a heat treatment is performed by loading a workpiece on a carriage and taking it into and out of the furnace, and a cooling process is performed. A method for determining a time between heat treatment steps to the subsequent second heat treatment step, where the difference between the start temperature and the end temperature is determined when the start temperature of the second heat treatment step is lower than the end temperature of the first heat treatment step. When the start temperature of the second heat treatment step is equal to or higher than the end temperature of the first heat treatment step, the value obtained by dividing the value by the furnace cooling rate determined in advance according to the size of the furnace is the carriage cooling time. A step of setting the time to 0, and if the bogie cooling time is larger than an additional time predetermined in accordance with a work cooling method, the sum of the bogie cooling time and the loading time on the bogie is calculated as the time between the heat treatments. Determined as That one, when the carriage cooling time is less than the additional time and determining the sum of time loading the with the additional time as between the heat treatment time.

Claims

In a batch type heat treatment furnace that performs heat treatment and cooling during this time by loading and unloading workpieces on the carriage and determining the time between heat treatments between the first heat treatment step and the subsequent second heat treatment step When the start temperature of the second heat treatment step is lower than the end temperature of the first heat treatment step, the difference between the start temperature and the end temperature is determined in accordance with the furnace cooling determined in advance according to the size of the furnace. While the value divided by the speed is used as the bogie cooling time, when the start temperature of the second heat treatment process is equal to or higher than the end temperature of the first heat treatment process, the bogie cooling time is set to 0; When the additional time predetermined in accordance with the work cooling method is greater than the predetermined time, the sum of the cart cooling time and the loading time on the cart is determined as the time between heat treatments, while the cart cooling time is less than the additional time. Steps and heat treatment time between determining a batch type heat treating furnace comprising determining the sum of time loading the with the additional time as between the heat treatment time in the case of.