A cooling rate controllable heat treatment device and method

Abstract

The invention discloses a cooling speed controllable heat treatment device and method. The device comprises a heating furnace, a transfer channel and a cooling tank. The furnace and the tank are eachinternally provided with a guide rail and a sample carrying vehicle. A conveying roller way is arranged in the channel, the two ends of the transfer channel are in sealed communication with the heating furnace and the cooling tank correspondingly, two communicating ports are provided with lifting doors, an air conveying pump and a flow meter are arranged between the bottom of the cooling tank anda cooling air source, an air supply pump is arranged between the top of the bottom of the cooling tank and atmosphere, and an air outlet pipe is provided with a water cooling sleeve pipe. The method comprises the steps that sample temperature increasing and preservation are completed in the furnace; the first lifting door is opened, a sample is transferred to the conveying roller way, and then thelifting door is closed; the second lifting door is opened, the sample is transferred into the cooling tan through the conveying roller way, and then the lifting door is closed; the real-time temperature of the sample is measured, a target cooling speed is input into a computer, and the cooling gas type and flow speed are determined; cooling gas is input into the tank for cooling the sample, and meanwhile air exhausting is started to keep the temperature and pressure intensity in the tank stable till the sample is cooled.

Description

technical field [0001] The invention belongs to the technical field of material heat treatment, and in particular relates to a heat treatment device and method with controllable cooling rate. Background technique [0002] In the industrial production process, heat treatment has a huge impact on product performance. The heat treatment equipment is mainly heat treatment furnace, which plays a vital role in ensuring the product performance after heat treatment. However, the main functions of the existing heat treatment furnaces are all Focusing on the control of heating temperature and holding time, little attention has been paid to the control of cooling speed after heat preservation, which has brought a lot of obstacles to the research of different cooling speeds on the structure and performance of products. [0003] To this end, the industry has designed a variety of heat treatment equipment that can adjust the cooling rate, the following are examples: [0004] ①. The Chine...

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Problems solved by technology

[0004] ①. The Chinese patent application with the publication number CN201842873U discloses a controllable cooling rate heat treatment furnace, which adds a cooling fan behind the furnace, and controls the air volume blown in by adjusting the opening of the furnace door, thereby realizing the control of the cooling rate However, the cooling gas source of this heat treatment furnace is air, and the air contains a lot of oxygen, which is not suitable for heat treatment samples with strict oxidation requirements; at the same time, the heat treatment furnace is controlled by adjusting the opening of the furnace door. The cooling speed, the control accuracy of the cooling speed is low, and the cooling of the sample needs to be completed in the resistance furnace, resulting in a low utilization rate of the resistance furnace

[0005] ②. The Chinese patent application with the publication number CN105219933A discloses a resistance furnace with adjustable cooling rate, which is used in conjunction with the induced draft fan through the chimney to organically combine the heating, constant temperature and automatic control of the temperature reduction of the resistance furnace, but the resistance The furnace cannot accurately control the cooling rate, and the cooling of the sample needs to be completed in the resistance furnace, resulting in low utilization of the resistance furnace

[0006] ③. The Chinese patent application whose publication number is CN207797740U discloses a fast heating and cooling auxiliary device for a box-type resistance furnace. Two ventilation cavities are arranged on the upper and lower sides of the furnace body to form an air circuit, and the cooling pipe is arranged on the outside of the pipeline and It is connected with a chiller to form a cold water circuit to control the cooling temperature, but this device is only to increase the cooling rate of the cooling process, but cannot achieve accurate control of the cooling rate, and the cooling of the sample needs to be performed in a resistance furnace. It is completed within a period of time, resulting in a low utilization rate of the resistance furnace

[0007] 4. The Chinese patent application whose publication number is CN206113628U discloses a trolley-type resistance furnace that can control the temperature rise and fall speed. By controlling the circulation speed of the cold air outside the furnace in the cooling tube, the control of the temperature reduction speed in the furnace is realized. However, the resistance furnace only controls the gas flow rate in the cooling tube through the fan, and cannot accurately control the cooling rate, and the cooling of the sample needs to be completed in the resistance furnace, resulting in a low utilization rate of the resistance furnace

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