All kinds of heat treatment furnaces are given a rated working area according to the design and manufacturing level (also known as effective heating zone) size, and maintain a certain furnace temperature uniformity. In order to timely grasp the changes of furnace temperature uniformity of heat treatment furnace, it is also necessary to detect the furnace temperature uniformity according to the changes of furnace conditions during the production process and regularly detect the furnace temperature uniformity. If one of the following conditions is met, the furnace temperature uniformity should be detected: ① before the newly added heat treatment furnace is officially put into production, or it is reused after being idle for more than half a year: ② after overhaul or technical transformation; ③ If the production object or process of the heat treatment furnace changes, it is necessary to change the size of the effective heating zone or the range of the service temperature; ④ Major changes in the category or usage of protective atmosphere: ⑤ changes in the position of temperature control or temperature thermocouple; ⑥ The analysis shows that the quality accident may be related to the uneven furnace temperature; ⑦ Regular inspection. The periodic detection cycle and temperature instrument detection cycle are shown in Table 2.
Table 2 furnace temperature uniformity and temperature instrument detection cycle
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Heat treatment category
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Uniformity of furnace temperature
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Temperature instrument
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Ⅰ
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1 month
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half a year
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Ⅱ
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half a year
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half a year
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Ⅲ
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half a year
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half a year
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Ⅳ
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half a year
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half a year
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Ⅴ
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one year
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one year
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The uniformity of furnace temperature is generally measured under no-load condition, and it can also be measured under half load or full load if necessary. Most of the measurement methods are volume method, section method and single point method. The furnace temperature uniformity test is carried out according to Hb 5425-89 "method for determining the effective heating zone of heat treatment furnace for aerospace parts". The furnace temperature uniformity shall be managed by listing, and the furnace shall be clearly marked as effective Size and position of work area, furnace type, date of this and next verification, etc. In the production process of heat treatment, it is also necessary to treat according to the requirements of heat treatment process The workpiece is placed in the effective working area for heating, so as to truly achieve the purpose of furnace temperature uniformity detection and management.
3. Breakthrough in heat treatment technology
Heat treatment refers to the use of heating or cooling to achieve the desired results. A metal hot working process in which materials are heated, insulated and cooled in the solid state to obtain the expected microstructure and properties. In the process from the stone age to the bronze age and the iron age, the role of heat treatment has been gradually recognized by people. For example, hardening or softening of materials. Heat treatment technology includes annealing, surface hardening, precipitation strengthening, tempering, normalizing and quenching. The current standards include gb/t7232-2012, gb/t8121-2002, gb/t9452-2003, gb/z18718-2002, gb/t22561-2008 and ams2750 e/f/g. Guided by the current standards, Hongzhan science and technology research and development center integrates many technical and scientific researchers to carry out R & D and design, and has made breakthrough progress in the past few days. Now the equipment is under commissioning, and it is expected to be put into the market in the near future, adding bricks and tiles to industrial tests and other fields.
Guangdong Hongzhan Technology Co., Ltd. was founded on May 4, 2005, with its headquarters in Dongguan City, Guangdong Province, China. It has a design and R & D center and production plant, with a production area of more than 6000 square meters, and produces about 1000 environmental test boxes every year. The company has sales and maintenance service centers in Beijing, Shanghai, Wuhan, Chengdu, Chongqing and Hong Kong. Tens of thousands of customers choose the products of Guangdong Hongzhan Technology Co., Ltd. and assemble them in their laboratories and production lines to test cars, trains, aircraft, satellites, mobile phones and other products in a more appropriate, reliable and effective way. By improving product quality and reliability, reduce waste products and failed products, and make the environment better and sustainable development!