A multi-stage variable-diameter infrared temperature measuring device and temperature measuring method for induction melting

A technology of infrared temperature measurement and induction smelting, which is applied in the directions of measuring devices, radiation pyrometry, sensing liquid thermal radiation, etc., can solve problems such as inability to achieve continuous measurement, influence of temperature measurement accuracy, and unstable temperature measurement points , to achieve the effect of improving temperature measurement accuracy, fast temperature measurement response speed and prolonging life

Active Publication Date: 2018-06-19
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the traditional hand-held infrared thermometer is not suitable for vacuum induction melting. The main problems are: first, the temperature measurement point of the hand-held infrared thermometer is artificially controlled, and the temperature measurement point is unstable, resulting in errors secondly, continuous measurement cannot be realized due to the need for hand-held infrared thermometers; finally, infrared temperature measurement is easily affected by the surrounding environment, while vacuum induction melting melts alloys under high temperature and high vacuum conditions, and the alloy melt Gasification, volatilization, and flue gas produced by the working medium at high temperature will cause a large amount of dust and flue gas near the melting crucible. These substances are usually easy to attach to the glass window of the infrared thermometer temperature measurement port, thus affecting the temperature measurement. The accuracy of the temperature has a great influence on the
At present, some infrared thermometers eliminate the influence of flue gas by purging, but this method is also not suitable for vacuum induction melting. Firstly, the effect of purging is not stable, and secondly, the gas purged will inevitably affect the alloy to be measured. The surface temperature of the melt is affected, resulting in a drop in temperature and inaccurate temperature measurement

Method used

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  • A multi-stage variable-diameter infrared temperature measuring device and temperature measuring method for induction melting
  • A multi-stage variable-diameter infrared temperature measuring device and temperature measuring method for induction melting
  • A multi-stage variable-diameter infrared temperature measuring device and temperature measuring method for induction melting

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Embodiment 1

[0035] The device of the present invention is used to smelt GH4169 nickel-based superalloy return material, the refining temperature is 1650° C., and the refining time is 10 minutes.

[0036] Step 1: Preheat the crucible, ingot mold, and the funnel used for pouring, then place it in the vacuum induction furnace, clean the furnace and furnace wall.

[0037] Step 2: Pretreatment of the returned material: Use a grinder to grind the returned material to remove the scale on the surface of the returned material. Then ultrasonically clean it with acetone for about 10 minutes, and dry it in an oven.

[0038] Step 3: Put the pretreated return materials into the furnace crucible, cover the furnace cover; after evacuating for 1-2 hours, start to supply electricity.

[0039] Step 4: First add the charge to the furnace with a low power below 5KW for 10-20 minutes, and then gradually increase the power to 10-15KW to melt all the charge. After the charge is completely melted, open the arg...

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Abstract

The invention discloses an infrared temperature measuring device and a temperature measuring method for vacuum induction smelting, comprising an infrared temperature measuring probe, a window, a multi-stage temperature measuring tube and a fixing device; Infrared light, the window is used to keep the vacuum seal and allow the infrared light to pass through, the multi-stage temperature measuring tube allows the infrared light to pass through, focus and form a spot irradiated on the temperature target to be measured, and the temperature measurement process The generated smoke and / or steam is deposited and / or discharged; the multi-stage temperature measuring tube includes a multi-stage structure, and at least one stage of the multi-stage structure includes a wide-diameter portion at one end and a small hole at the other end; The fixing device is used to fix the infrared temperature measuring device, so that the light spot formed by the infrared light for temperature measurement is irradiated on the target to be measured. The present invention is different from the traditional hand-held infrared temperature measuring device, and adopts a fixed and multi-level structural connection method, so that dust and steam are deposited on the inner wall of the temperature measuring tube during the rising process, preventing them from adhering to the glass window of the temperature measuring port , which can realize real-time, continuous and accurate temperature measurement.

Description

technical field [0001] The invention belongs to the technical field of casting equipment, and in particular relates to a multi-stage variable-diameter infrared temperature measuring device and a temperature measuring method for induction melting. Background technique [0002] Vacuum induction melting technology has been widely used in the production of special alloy materials such as nickel-based superalloys, titanium alloys, stainless steel, and ultra-high-strength steel due to its high efficiency, low energy consumption, and strong electromagnetic stirring effect that is beneficial to eliminate component segregation. . In the vacuum induction melting process, the alloy liquid is usually refined under the conditions of high temperature, high vacuum and high stirring, and the appropriate pouring temperature must be controlled. Therefore, realizing accurate measurement of alloy melt temperature plays a key role in achieving high purity and high accuracy of final alloy compon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J5/00G01J5/02
CPCG01J5/004G01J5/05
Inventor 张花蕊张虎
Owner BEIHANG UNIV
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