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Non-contact molten pool temperature measuring system and method for powder laying type laser additive manufacturing

A temperature measurement and laser additive technology, which is applied in optical radiation measurement, radiation pyrometry, measuring devices, etc., can solve the problem of high difficulty in follow-up measurement of molten pool temperature, and achieve follow-up temperature test with fast measurement response speed , The effect of high temperature measurement accuracy

Inactive Publication Date: 2020-05-19
SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI
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  • Abstract
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Problems solved by technology

It is extremely difficult to realize the follow-up measurement of the molten pool temperature

Method used

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  • Non-contact molten pool temperature measuring system and method for powder laying type laser additive manufacturing
  • Non-contact molten pool temperature measuring system and method for powder laying type laser additive manufacturing

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Embodiment 1

[0029] The infrared thermometer used in this embodiment is a Rayteck infrared two-color thermometer, and the test process uses a single-color mode to work. The emissivity calibration of infrared temperature measurement during the test is: 0.9.

[0030] The infrared thermometer is connected through the R485 communication module, and then connected to the host computer to collect test data. The specific implementation process does not add a small hole at the front end of the infrared thermometer.

[0031] The temperature information of the molten pool in the process of powder-spraying additive manufacturing process was measured for the powder-spreading forming 316L stainless steel material with a particle size of <325 μm spherical powder. Melt pool temperature measurements were carried out under the following process parameter conditions. Additive process parameters: laser power (170 / 180 / 190 / 200W), scanning speed (200, 300, 400mm / s).

[0032] The measurement of the temperatur...

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PUM

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Abstract

The invention discloses a non-contact molten pool temperature measuring system and method for powder laying type laser additive manufacturing, and belongs to the technical field of powder laying typeadditive manufacturing. A reflector, a filter lens and the like are designed in an existing laser powder laying type additive manufacturing light path system, an infrared thermometer is adopted for capturing infrared light beams, transmitted to the light path system, of heat radiation light beams, and measurement of a temperature of a molten pool is achieved. Accuracy of the optical path system ina testing process and relative position accuracy of the infrared thermometer in an optical path have an important influence on the accuracy of a testing temperature. By utilizing the test method andsystem designed in the invention, temperature change characteristics of the molten pool can be rapidly tested in a non-contact manner, and a test response speed is high.

Description

technical field [0001] The invention relates to the technical field of powder-spraying additive manufacturing, in particular to a non-contact melting pool temperature measurement system and method for powder-spreading laser additive manufacturing. Background technique [0002] Powder-spreading additive manufacturing technology, also known as laser selective melting / sintering technology, can realize the direct molding of fine and ultra-fine structures of various alloy materials such as aluminum, titanium, nickel, copper, and cobalt. It is used in aerospace, biomedicine, automobiles, Typical applications have been obtained in jewelry, etc., and the technology is currently developing vigorously. The powder-spraying additive manufacturing process often takes a long time to form and the forming process is complicated. During the long-term and high-frequency operation of the equipment, it is likely that the forming quality of the local area will have problems due to heat accumulat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J5/00
CPCG01J5/0044
Inventor 王志国赵宇辉赵吉宾高元聂长武
Owner SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI
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