In-situ temperature measuring device and method for additive molten pool

Abstract

The invention relates to an in-situ temperature measuring device and method for an additive molten pool, relates to the field of additive manufacturing, and can avoid the influence of offline or transposition traceability on a detection result, improve the integration degree of the in-situ temperature measuring device for additive manufacturing, simplify the traceability process and accelerate the detection efficiency. The current real temperature of the target melt material is measured online in real time in the additive manufacturing process, and whether the state of the target melt material meets the requirement of additive manufacturing or not is judged. The in-situ temperature measurement device for the additive molten pool comprises a first light extraction module, a second light extraction module, a third light extraction module, a radiation detection module, an analysis module and a temperature determination module, wherein the radiation detection module is used for determining a radiation brightness value corresponding to incident light. The analysis module is used for determining the radiation emissivity of the target melt material at the preset temperature. And the temperature determination module is used for determining the current real temperature of the target melt material in the second cavity according to the radiation emissivity and the third radiation brightness value.

Description

Technical Field

[0001] The present application relates to the field of additive manufacturing, and in particular to an in-situ temperature measurement device and method for an additive molten pool. Background Art

[0002] Process quality monitoring and quality certification in additive manufacturing is a current research hotspot. At present, additive manufacturing technology has achieved rapid development and has been widely used. The additive manufacturing process requires monitoring equipment to monitor the manufacturing process in order to achieve standardization of additive manufacturing and consistency of component quality.

[0003] However, in traditional technologies, the monitoring equipment of the additive manufacturing process is monitored offline, which is unable to accurately replicate the processing environment and actual optical path in the additive manufacturing project, resulting in large deviations in the detection of parameters such as temperature and radiation intensity. The accuracy of the detection results is low, affecting the quality of additive manufacturing products. Summary of the invention

[0004] The purpose of this application is to provide an in-situ temperature measurement device and method for an additive manufacturing melt pool, which can effectively detect the actual temperature of additively manufactured products, improve the accuracy of temperature detection results of additively manufactured products, and improve the quality of additively manufactured products.

[0005] To achieve the purpose of this application, this application provides the following technical solutions:

[0006] In a first aspect, the present application provides an in-situ temperature measurement device for an additive molten pool, comprising:

[0007] A first light extraction module, located in the first cavity, for extracting a first light emitted by the target melt material in the first cavity at a preset temperature;

[0008] A second light extraction module, located in the first cavity, for extracting a second light emitted by a standard black body material at a preset temperature;

[0009] A third light extraction module, located in the second cavity, for extracting a third light emitted by the target melt material in the second cavity;

[0010] a radiation detection module, used to determine a radiation brightness value corresponding to the incident light according to at least one of the light brightness and the light intensity of the incident light, the radiation detection module being used to receive the first light, the second light and the third light, wherein the radiation brightness value of the first light is a first radiation brightness value, the radiation brightness value of the second light is a second radiation brightness value, and the radiation brightness value of the third light is a third radiation brightness value;

[0011] An analysis module, configured to determine the radiation emissivity of the target melt material at the preset temperature according to the first radiation brightness value and the second radiation brightness value;

[0012] The temperature determination module is used to determine the current real temperature of the target melt material in the second cavity according to the radiation emissivity and the third radiation brightness value.

[0013] In one embodiment, the radiation detection module includes a first state and a second state, in which the radiation detection module is used to receive the first light or the second light, and in which the radiation detection module is used to receive the third light;

[0014] The in-situ temperature measuring device for the additive molten pool also includes:

[0015] The transport module, the first cavity and the second cavity are located on a fixed side of the transport module, the radiation detection module is located on a movable side of the transport module, and the transport module is used to adjust the position of the radiation detection module to switch the use state of the radiation detection module.

[0016] In one embodiment, the transport module comprises:

[0017] A sliding guide rail, wherein the extending direction of the sliding guide rail is the direction from the first cavity to the second cavity;

[0018] A movable structure, the radiation detection module is fixed on the movable structure, the movable structure is movably connected to the sliding guide rail, and the movable structure is used to drive the optical path adjustment module to move along the extension direction of the sliding guide rail.

[0019] In one embodiment, the radiation detection module includes:

[0020] A light intensity radiation detection module, used to determine the radiation brightness value of the incident light according to the light intensity of the incident light; and / or,

[0021] The brightness radiation detection module is used to determine the radiation brightness value of the incident light according to the brightness of the incident light.

[0022] In one embodiment, the light intensity radiation detection module includes:

[0023] The photodetector is used to determine the radiation brightness value of the incident light according to the number of electrons generated by the incident light within a preset time period.

[0024] In one embodiment, the brightness radiation detection module includes:

[0025] The spectrum detector is used to determine the radiation brightness value of the incident light according to the spectrum information of the incident light.

[0026] In one embodiment, it also includes:

[0027] A temperature detection module is used to receive the first light, the second light and the third light, and the temperature detection module is used to determine the current radiation temperature of the incident light according to the brightness of the incident light, wherein the temperature detection module includes an infrared thermal imager.

[0028] In a second aspect, the present application provides an in-situ temperature measurement method for an additive melt pool, comprising:

[0029] Extracting a first light beam emitted by a target melt material in a first cavity at a preset temperature;

[0030] Extracting a second light emitted by a standard black body material at a preset temperature;

[0031] extracting a third light ray emitted by the target melt material in the second cavity;

[0032] Determine, by a radiation detection device, a radiation brightness value corresponding to the incident light according to at least one of the light brightness and the light intensity of the incident light, wherein the radiation brightness value of the first light is a first radiation brightness value, the radiation brightness value of the second light is a second radiation brightness value, and the radiation brightness value of the third light is a third radiation brightness value;

[0033] Determining the radiation emissivity of the target melt material at the preset temperature according to the first radiation brightness value and the second radiation brightness value;

[0034] The current real temperature of the target melt material in the second cavity is determined according to the radiation emissivity and the third radiation brightness value.

[0035] In one embodiment, before the step of extracting the first light emitted by the target melt material in the first cavity at a preset temperature, the method further includes:

[0036] Obtaining a standard radiation brightness value of the standard black body material at the preset temperature;

[0037] Based on the standard radiation brightness value and the second radiation brightness value, a radiation correction parameter is determined, and the radiation correction parameter is used to correct the first radiation brightness value and the third radiation brightness value.

[0038] In one embodiment, before the step of extracting the first light emitted by the target melt material in the first cavity at a preset temperature, the method further includes:

[0039] Moving the radiation detection device to the light exiting side of the first cavity so that the first light or the second light is incident on the radiation detection device;

[0040] In one embodiment, before the step of extracting the third light emitted by the target molten material in the second cavity, the method further includes:

[0041] The radiation detection device is moved to the light exiting side of the second cavity so that the third light is incident on the radiation detection device.

[0042] The in-situ temperature measurement device and method for additive manufacturing of the present application extracts the first light emitted by the target melt material at a preset temperature through the first light extraction module, and then extracts the second light emitted by the standard black body material at a preset temperature through the second light extraction module, and determines the radiation brightness value corresponding to the first light and the second light according to at least one of the light brightness and light intensity of the incident light through the radiation detection module. The first light and the second light are analyzed by the analysis module, and the radiation emissivity of the target melt material relative to the standard black body material is determined according to the standard radiation value of the standard black body material at the preset temperature, combined with the radiation brightness value of the target melt material in the first cavity and the radiation brightness value of the standard black body, so that the corresponding relationship between the heating temperature and the radiation brightness value of the target melt material can be established. Further, the third light emitted by the target melt material in the second cavity is extracted by the third light extraction module, and the radiation brightness value corresponding to the third light is determined by the radiation detection module. The temperature determination module determines the current real temperature of the target melt material in the second cavity according to the radiation brightness value of the target melt material in the second cavity and the radiation emissivity determined based on the target melt material in the first cavity. This can avoid the impact of offline or transposition traceability on the test results, improve the integration level of in-situ temperature measurement devices used for additive manufacturing, simplify the traceability process, and speed up the test efficiency. It can achieve real-time online measurement of the current true temperature of the target melt material during the additive manufacturing process, determine whether the state of the target melt material meets the requirements of additive manufacturing, improve the reliability and accuracy of the test results, and further improve the quality of additive manufacturing components. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0044] Figure 1 is a schematic structural diagram of an in-situ temperature measurement device for an additive melt pool provided in an embodiment of the present application;

[0045] Figure 2 is a schematic structural diagram of another in-situ temperature measurement device for an additive melt pool provided in an embodiment of the present application;

[0046] Figure 3 is a schematic structural diagram of another in-situ temperature measurement device for an additive melt pool provided in an embodiment of the present application;

[0047] Figure 4 is a schematic structural diagram of another in-situ temperature measurement device for an additive molten pool provided in an embodiment of the present application;

[0048] Figure 5 is a schematic structural diagram of an in-situ temperature measurement device for an additive melt pool provided in an embodiment of the present application;

[0049] Figure 6 is a schematic structural diagram of another in-situ temperature measurement device for an additive melt pool provided in an embodiment of the present application;

[0050] Figure 7 It is a schematic flow chart of a radiation printing method for an additive melt pool provided in an embodiment of the present application.

[0051] Description of Reference Numerals

[0052] 100, first light extraction module; 200, second light extraction module; 300, third light extraction module; 400, radiation detection module; 500, analysis module; 600, first cavity; 700, second cavity; 800, temperature determination module.

[0053] 11. First focusing mirror; 12. Second focusing mirror; 13. Total reflection mirror; 14. First semi-reflective lens; 15. Second semi-reflective lens; 16. Third semi-reflective lens; 17. Third focusing mirror; 18. First photodiode; 19. Second photodiode; 20. Infrared thermal imager; 21. Shared optical path; 22. Dichroic mirror; 23. Scanning galvanometer; 24. Fourth semi-reflective mirror; 25. First aperture; 26. Second aperture; 27. Standard black body material; 28. Target melt material; 29. ​​Heating furnace; 30. Integrating sphere. DETAILED DESCRIPTION

[0054] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present application are given in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0055] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0056] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that when the terms "consisting of" and / or "comprising" are used in this specification, the presence of the features, integers, steps, operations, elements and / or parts can be determined, but the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups is not excluded. At the same time, when used herein, the term "and / or" includes any and all combinations of the relevant listed items.

[0057] Process quality monitoring and quality certification in additive manufacturing is a current research hotspot. At present, additive manufacturing technology has achieved rapid development and has been widely used. The additive manufacturing process requires monitoring equipment to monitor the manufacturing process in order to achieve standardization of additive manufacturing and consistency of component quality.

[0058] However, in traditional technologies, the monitoring equipment of the additive manufacturing process is monitored offline, which is unable to accurately replicate the processing environment and actual optical path in the additive manufacturing project, resulting in large deviations in the detection of parameters such as temperature and radiation intensity, affecting the quality of additive manufacturing products.

[0059] The present application embodiment provides an in-situ temperature measurement device for additive manufacturing, please refer to Figures 1 to 5, comprising: a first light extraction module 100, a second light extraction module 200, a third light extraction module 300 and a radiation detection module 400, wherein the first light extraction module 100 is located in the first cavity 600, and is used to extract the first light emitted by the target melt material 28 in the first cavity 600 at a preset temperature. The second light extraction module 200 is located in the first cavity 600, and is used to extract the second light emitted by the standard black body material 27 at a preset temperature. The third light extraction module 300 is located in the second cavity 700, and is used to extract the third light emitted by the target melt material 28 in the second cavity 700. The radiation detection module 400 is used to determine the radiation brightness value corresponding to the incident light according to at least one of the light brightness and the light intensity of the incident light, and the radiation detection module 400 is used to receive the first light, the second light and the third light, wherein the radiation brightness value of the first light is the first radiation brightness value, the radiation brightness value of the second light is the second radiation brightness value, and the radiation brightness value of the third light is the third radiation brightness value. The analysis module 500 is used to determine the radiation emissivity of the target melt material 28 at a preset temperature according to the first radiation brightness value and the second radiation brightness value. The temperature determination module 800 is used to determine the current real temperature of the target melt material 28 in the second cavity 700 according to the radiation emissivity and the third radiation brightness value.

[0060] It should be noted that the standard black body material is a material for which the corresponding relationship between temperature and radiation value is known.

[0061] For example, Figure 2 The schematic diagram of the in-situ temperature measurement device for additive manufacturing is shown in FIG. Figure 3 This is a schematic structural diagram of the first light extraction module 100, the second light extraction module 200 and the radiation detection module 400 working together in the in-situ temperature measurement device for additive manufacturing. The target melt material 28 in the first cavity 600 and the target melt material 28 in the second cavity 700 are the same material. The target melt material 28 in the first cavity 600 is used to compare with the radiation brightness value of the standard black body to determine the radiation emissivity of the target melt material 28 relative to the standard black body material 27, so that the corresponding relationship between the heating temperature and the radiation brightness value of the target melt material 28 can be established. The target melt material 28 in the second cavity 700 is the melt material to be detected.

[0062] It should be noted that the radiation emissivity of the standard black body material 27 is a certain value. The standard black body material 27 is used to provide a standard radiation energy value to provide a reference value for the determination of the radiation emissivity of the target melt material 28. Specifically, in this embodiment, the target melt material 28 is AlSi10Mg metal powder.

[0063] Exemplarily, the preset temperature is the temperature at which the target melt material 28 is tested during the test, and the preset temperature can be freely set according to the actual use scenario of the target melt material 28. When the same target melt material 28 is tested, the preset temperature may include multiple ones.

[0064] For example, Figure 4 : This is a schematic structural diagram of the first light extraction module 100 and the radiation detection module 400 working together. The first light extraction module 100 and the second light extraction module 200 may both include a common optical path 21 and an integrating sphere 30. The common optical path 21 includes a transparent glass and a reflector. The first integrating sphere 30 is used to collect and emit the first light or the second light without deviation, and after passing through the transparent glass, the first light emitted by the target melt material 28 and the second light emitted by the standard black body material 27 are reflected to the radiation detection module 400 by the reflector. Among them, the transparent glass is used for light transmission, and the transparent glass can be optical glass, and the transparent glass has good light transmittance in the visible light band to the infrared light band.

[0065] In another example, Figure 5 This is a schematic structural diagram of the first light extraction module 100 and the radiation detection module 400 working together. The integrating sphere 30 can be replaced with a semi-reflective and semi-transparent mirror to achieve the effect achieved by the integrating sphere 30.

[0066] It should be noted that the first cavity 600 may also include a heating furnace 29, a thermocouple, a crucible and a controller. The heating furnace 29 is used to heat and melt the target melt material 28 to ensure that the target melt material 28 is heated to a constant temperature. Specifically, the heating furnace 29 can heat the target melt material 28 by electric heating, electromagnetic heating, etc. The crucible is used to hold the target melt material 28, and the thermocouple is used to measure the temperature of the target melt material 28, and the thermocouple is arranged at least at the upper, middle and lower parts of the crucible. The controller is used to control the temperature and parameters of the heating furnace 29 and the standard black body material 27.

[0067] The in-situ temperature measurement device for additive manufacturing of the present application extracts the first light emitted by the target melt material 28 at a preset temperature through the first light extraction module 100, and then extracts the second light emitted by the standard black body material 27 at a preset temperature through the second light extraction module 200, and determines the radiation brightness value corresponding to the first light and the second light according to at least one of the light brightness and light intensity of the incident light through the radiation detection module 400. The first light and the second light are analyzed by the analysis module 500, and the radiation emissivity of the target melt material 28 relative to the standard black body material 27 is determined according to the standard radiation value of the standard black body material 27 at a preset temperature, combined with the radiation brightness value of the target melt material 28 in the first cavity 600 and the radiation brightness value of the standard black body, so that the corresponding relationship between the heating temperature and the radiation brightness value of the target melt material 28 can be established. Further, the third light emitted by the target melt material 28 in the second cavity 700 is extracted by the third light extraction module 300, and the radiation brightness value corresponding to the third light is determined by the radiation detection module 400. The temperature determination module determines the current real temperature of the target melt material 28 in the second cavity 700 according to the radiation brightness value of the target melt material 28 in the second cavity 700 and the radiation emissivity determined based on the target melt material 28 in the first cavity 600. This can avoid the impact of offline or transposition traceability on the detection results, improve the integration level of the in-situ temperature measurement device for additive manufacturing, simplify the traceability process, and speed up the detection efficiency. It can achieve real-time online measurement of the current real temperature of the target melt material 28 during the additive manufacturing process, determine whether the state of the target melt material 28 meets the requirements of additive manufacturing, improve the reliability and accuracy of the test results, and further improve the quality of additive manufacturing components.

[0068] In some embodiments, see Figures 3 to 6 The radiation detection module 400 includes a first state and a second state. In the first state, the radiation detection module 400 is used to receive the first light or the second light. In the second state, the radiation detection module 400 is used to receive the third light. The in-situ temperature measurement device for the additive melting pool also includes: a transportation module, the first cavity 600 and the second cavity 700 are located on the fixed side of the transportation module, the radiation detection module 400 is located on the movable side of the transportation module, and the transportation module is used to adjust the position of the radiation detection module 400 to switch the use state of the radiation detection module 400.

[0069] As an example, Figure 6 It is a schematic structural diagram of the radiation detection module 400 in the in-situ temperature measurement device for additive manufacturing. In the first state, the radiation detection module 400 is used to determine the radiation emissivity of the target melt material 28 in the first cavity 600 according to the radiation emissivity of the standard black body material 27, so that the corresponding relationship between the heating temperature and the radiation brightness value of the target melt material 28 can be established.

[0070] As an example, in the second state, the radiation detection module 400 is used to detect the current real temperature of the target melt material 28 in the second cavity 700 according to the corresponding relationship between the heating temperature of the target melt material 28 and the radiation brightness value.

[0071] It should be noted that by providing a transport module to carry the radiation detection module 400 to switch between the first state and the second state, it can be further ensured that the light incident on the radiation detection module 400 has a high consistency before incident on the radiation detection module 400, thereby further eliminating the influence of the light environment change on the temperature measurement result. At the same time, there is no need to move the first cavity 600 and the second cavity 700, thereby further reducing the temperature change in the cavity, so as to realize the in-situ traceability and in-situ temperature measurement of the additive, thereby improving the objectivity and accuracy of the detection result.

[0072] The in-situ temperature measuring device for additive manufacturing of the present application can realize free switching of the radiation detection module 400 between the first state and the second state by setting a transport module, and then in the first state, the target melt material 28 in the first cavity 600 and the relationship between the heating temperature and the radiation emissivity of the target melt material 28 can be traced in situ, and the actual temperature of the target melt material 28 in the second cavity 700 can be further detected in situ, thereby improving the objectivity and accuracy of the in-situ temperature measuring device for additive manufacturing in detecting the target melt material 28.

[0073] In some embodiments, the transport module includes: a sliding rail, the extension direction of the sliding rail is the direction from the first cavity 600 to the second cavity 700. A movable structure, the radiation detection module 400 is fixed on the movable structure, the movable structure is movably connected to the sliding rail, and the movable structure is used to drive the optical path adjustment module to move along the extension direction of the sliding rail.

[0074] As an example, the sliding rail and the movable structure may adjust the position of the radiation detection module 400 so that the radiation detection module 400 switches between the first state and the second state.

[0075] The in-situ temperature measurement device for additive manufacturing of the present application can maintain the device working smoothly and flexibly by setting a sliding guide rail and a movable structure so that the radiation detection module 400 can be freely switched between the first state and the second state.

[0076] In some embodiments, see Figure 6 The radiation detection module 400 includes: a light intensity radiation detection module, which is used to determine the radiation brightness value of the incident light according to the light intensity of the incident light; and / or a brightness radiation detection module, which is used to determine the radiation brightness value of the incident light according to the light brightness of the incident light.

[0077] In one example, the radiation detection module 400 includes a light intensity radiation detection module, which is used to determine the radiation brightness value of the incident light according to the light intensity of the incident light.

[0078] In another example, the radiation detection module 400 includes: a light intensity radiation detection module and a brightness radiation detection module, wherein the light intensity radiation detection module is used to determine the radiation brightness value of the incident light according to the light intensity of the incident light, and the brightness radiation detection module is used to determine the radiation brightness value of the incident light according to the light brightness of the incident light.

[0079] In yet another example, the radiation detection module 400 includes a brightness radiation detection module, which is used to determine the radiation brightness value of the incident light according to the light brightness of the incident light.

[0080] The in-situ temperature measurement device for additive manufacturing of the present application can obtain at least one of the light brightness and the light intensity by setting a light intensity radiation detection module and a brightness radiation detection module to determine the radiation brightness values ​​corresponding to the first light and the second light. The first light and the second light are analyzed by the analysis module 500, and the radiation emissivity of the target melt material 28 relative to the standard black body material 27 is determined according to the standard radiation value of the standard black body material 27 at a preset temperature, combined with the radiation brightness value of the target melt material 28 in the first cavity 600 and the radiation brightness value of the standard black body, so that the corresponding relationship between the heating temperature and the radiation brightness value of the target melt material 28 can be established.

[0081] In some embodiments, please continue Figure 6 The light intensity radiation detection module 400 includes: a photodetector, which is used to determine the radiation brightness value of the incident light according to the number of electrons generated by the incident light within a preset time period.

[0082] As an example, the photodetector can determine the radiant brightness value of the incident light according to the number of electrons generated by the incident light within a preset time. Specifically, the number of electrons can be calculated according to the following formula:

[0083]

[0084] The radiance responsivity can be calculated according to the following formula:

[0085]

[0086] Where tint is the integration time, L(λ) is the radiance at wavelength λ1 and λ2 and at wavelength λ2, G is the detector output signal value, c1 and c2 are Planck constants, and T is the temperature of the standard melt material.

[0087] It should be noted that the light intensity detection module may also include a second semi-reflective mirror 15, a third semi-reflective mirror 16, a fourth semi-reflective mirror 24 and a full-transmitting mirror. The second semi-reflective mirror 15, the third semi-reflective mirror 16 and the fourth semi-reflective mirror 24 are all used for light splitting, and the full-transmitting mirror is used to reflect the first light and the second light so as to make the light incident on the first photodiode 18 and the second photodiode 19. Specifically, the light intensity detection module may also include a filtering module, and the filtering module includes a first focusing mirror 11, a second focusing mirror 12 and a third focusing mirror 17. The first focusing mirror 11 and the second focusing mirror 12 are both used to focus and filter the first light emitted by the target melt material 28 and the second light emitted by the standard black body material 27. The first focusing mirror 11 can filter the radiation light other than 800~900nm, the second focusing mirror 12 can filter the radiation light other than 400~700nm, and the third focusing mirror 17 is used to focus the radiated light, and the third focusing mirror 17 does not have a filtering function. The filter module can personalize the target wavelength range according to the detection requirements, further analyze the brightness of light within the target wavelength range, and increase the comprehensiveness and diversity of the detection results.

[0088] In the in-situ temperature measurement device for the additive melt pool provided in the embodiment of the present application, the photoelectric detector can convert the received photons into electrons, so the radiation brightness value of the incident light can be determined according to the number of electrons generated by the incident light within a preset time. The corresponding relationship between the heating temperature and the radiation brightness value of the target melt material 28 and the standard black body material 27 can be established more intuitively and accurately, thereby improving the accuracy and objectivity of the detection results.

[0089] In some embodiments, please refer to Figure 6 The brightness radiation detection module 400 includes: a spectrum detector, which is used to determine the radiation brightness value of the incident light according to the spectrum information of the incident light.

[0090] As an example, the spectral detector may include but is not limited to a spectrometer, which is used for spectral signal detection. Specifically, in this embodiment, the spectral detection range of the spectrometer is 0.4~2.5μm. For example, the spectral detection of the spectrometer can be 0.4μm, 0.8μm, 1.2μm, 1.6μm, 2.0μm, 2.4μm or 2.5μm.

[0091] In the in-situ temperature measurement device for additive melting pool provided in the embodiment of the present application, the spectrum detector can form spectrum information of different wavelengths from the light intensity of the first light and the second light, and the wavelength and the radiation brightness value are positively correlated, so the radiation brightness value of the first light and the radiation brightness value of the second light can be determined based on the spectrum information of the spectrum detector at the same time. The radiation brightness value of the incident light can be determined more intuitively and accurately, improving the accuracy and objectivity of the detection results.

[0092] In some embodiments, please refer to Figure 6 The in-situ temperature measurement device for the additive melt pool also includes: a temperature detection module, which is used to receive the first light, the second light and the third light, and the temperature detection module is used to determine the current radiation temperature of the incident light according to the brightness of the incident light, wherein the temperature detection module includes an infrared thermal imager.

[0093] As an example, the infrared thermal imager 20 may be, but is not limited to, a telephoto medium-wave infrared thermal imager 20, which may be used to capture radiation images during additive processing, and the detector response band is 1.3 to 2.5 μm, for example, the detector response band may be 1.3 μm, 1.5 μm, 1.7 μm, 1.9 μm, 2.1 μm, 2.3 μm or 2.5 μm. The infrared thermal imager 20 includes a telephoto lens to ensure the radiance details of the radiation image, wherein the lens may be designed according to the actual distance during the actual operation, while ensuring that the depth of field of the thermal imager covers the farthest distance of the target melt material 28 to ensure clear imaging.

[0094] It should be noted that the in-situ temperature measurement device for the additive melt pool may also include an industrial computer for analysis. The industrial computer for analysis is used to install radiation measurement software, set measurement parameters, and operate the measurement process.

[0095] It should be noted that the in-situ temperature measurement device for the additive melt pool may also include: a laser powder bed melting device, and the laser powder bed melting device includes: a laser, an optical fiber, a scanning galvanometer 23, and a protective window. Among them, the laser is used to provide a high-energy beam laser for additive manufacturing. Specifically, in this embodiment, the laser power may be greater than 500W. For example, the laser power may be 500W, 600W, 700W or 800W. The optical fiber is used to transmit the laser emitted by the laser and accurately inject it into the scanning galvanometer 23. The scanning galvanometer 23 is used for focusing, splitting and scanning. The scanning galvanometer 23 includes a spectroscope, a first galvanometer, a second galvanometer and a protective window.

[0096] In some examples, the scanning galvanometer 23 may include a focusing mirror, which is used to focus the high-energy laser beam emitted by the laser to ensure that the high-energy laser beam is accurately irradiated on the target component of additive manufacturing, and the spectroscope is mainly used to reflect and filter the high-energy laser beam. The first galvanometer is connected to the first galvanometer motor, and the second galvanometer is connected to the second motor. The first motor and the second motor both have a scanning function to complete the scanning work of the scanning galvanometer 23. The protective window is used for light transmission. Specifically, the scanning window can be optical glass, which has good light transmittance from the visible light band to the infrared band. The molding cavity is mainly used to provide a molding environment for the target melt material 28, and mainly includes a cavity structure, a powder spreading device, a molding cylinder, and a Z-axis motion platform. The cavity structure is used to provide a working space for the powder spreading device and the molding cylinder. The powder spreading device is used to spread the target melt material 28 powder. The molding cylinder is used to provide a molding space for the target melt material 28. The Z-axis motion platform can move the various components of the laser powder bed melting device along the Z axis to adjust the length of the optical fiber to adapt to the working conditions of additive manufacturing.

[0097] The present application also provides an in-situ temperature measurement method for an additive melt pool, see Figure 7 ,include:

[0098] S11: extracting a first light beam emitted from the target melt material in the first cavity at a preset temperature.

[0099] Exemplarily, the target melt material 28 in the first cavity 600 and the target melt material 28 in the second cavity 700 are the same material. The target melt material 28 in the first cavity 600 is used to compare with the radiation brightness value of the standard black body to determine the radiation emissivity of the target melt material 28 relative to the standard black body material 27, so that the corresponding relationship between the heating temperature and the radiation brightness value of the target melt material 28 can be established.

[0100] Exemplarily, the preset temperature is the temperature at which the target melt material 28 is tested during the test, and the preset temperature can be freely set according to the actual use scenario of the target melt material 28. When the same target melt material 28 is tested, the preset temperature may include multiple ones.

[0101] S12: extracting the second light emitted by the standard black body material at a preset temperature.

[0102] It should be noted that the radiation emissivity of the standard black body material 27 is a certain value. The standard black body material 27 is used to provide a standard radiation energy value to provide a reference value for the determination of the radiation emissivity of the target melt material 28. The target melt material 28 is a melt material to be detected. Specifically, in this embodiment, the target melt material 28 is AlSi10Mg metal powder.

[0103] S13: extracting a third light ray emitted by the target melt material in the second cavity.

[0104] Exemplarily, the target melt material 28 in the second cavity 700 is the target melt material 28 to be detected.

[0105] S14: Determine the radiation brightness value corresponding to the incident light through a radiation detection device according to at least one of the light brightness and light intensity of the incident light, wherein the radiation brightness value of the first light is a first radiation brightness value, the radiation brightness value of the second light is a second radiation brightness value, and the radiation brightness value of the third light is a third radiation brightness value.

[0106] By way of example, but not limited to, the radiation detection module 400 may include a first photodiode 18, a second photodiode 19, and a detector corresponding to the photodiode, wherein the first photodiode 18 is used to detect and record radiation light of 800-900 nm, and the second photodiode 19 is used to detect and record radiation light of 400-700 nm. The detector is used to obtain the light brightness of the first light and the second light to determine the radiation brightness values ​​corresponding to the first light and the second light.

[0107] S15: Determine the radiation emissivity of the target melt material at a preset temperature according to the first radiation brightness value and the second radiation brightness value.

[0108] As an example, the photodetector can determine the radiant brightness value of the incident light according to the number of electrons generated by the incident light within a preset time. Specifically, the number of electrons can be calculated according to the following formula:

[0109]

[0110] The radiance responsivity can be calculated according to the following formula:

[0111]

[0112] Where tint is the integration time, L(λ) is the radiance at wavelength λ1 and λ2 and at wavelength λ2, G is the detector output signal value, c1 and c2 are Planck constants, and T is the temperature of the standard melt material.

[0113] S16: Determine the current actual temperature of the target melt material in the second cavity according to the radiation emissivity and the third radiation brightness value.

[0114] The radiation detection method for additive manufacturing of the cable of the present application is to extract the first light emitted by the target melt material 28 in the first cavity 600 at a preset temperature. Then extract the second light emitted by the standard black body material 27 at a preset temperature. Further extract the third light emitted by the target melt material 28 in the second cavity 700. The radiation detection device determines the radiation brightness value corresponding to the incident light according to at least one of the light brightness and light intensity of the incident light, wherein the radiation brightness value of the first light is the first radiation brightness value, the radiation brightness value of the second light is the second radiation brightness value, and the radiation brightness value of the third light is the third radiation brightness value. Further, according to the first radiation brightness value and the second radiation brightness value, the radiation emissivity of the target melt material 28 at the preset temperature is determined. Finally, according to the radiation emissivity and the third radiation brightness value, the current real temperature of the target melt material 28 in the second cavity 700 is determined. According to the standard radiation value of the standard black body material 27 at a preset temperature, combined with the radiation brightness value of the target melt material 28 in the first cavity 600 and the radiation brightness value of the standard black body, the radiation emissivity of the target melt material 28 relative to the standard black body material 27 is determined, so that the corresponding relationship between the heating temperature and the radiation brightness value of the target melt material 28 can be established. Further, the third light emitted by the target melt material 28 in the second cavity 700 is extracted by the third light extraction module 300, and the radiation brightness value corresponding to the third light is determined by the radiation detection module 400. The current real temperature of the target melt material 28 in the second cavity 700 is determined by the temperature determination module according to the radiation brightness value of the target melt material 28 in the second cavity 700 and the radiation emissivity determined based on the target melt material 28 in the first cavity 600. Thereby, the influence of offline or transposition traceability on the detection result can be avoided, the integration level of the in-situ temperature measurement device for additive manufacturing is improved, the traceability process is simplified, and the detection efficiency is accelerated. It is possible to measure the current true temperature of the target melt material 28 in real time online during the additive manufacturing process, determine whether the state of the target melt material 28 meets the requirements of additive manufacturing, improve the reliability and accuracy of the test results, and further improve the quality of additive manufacturing components.

[0115] In some embodiments, before the step of extracting the first light emitted by the target melt material 28 in the first cavity 600 at a preset temperature, the method further includes:

[0116] S01: Obtain the standard radiation brightness value of the standard black body material at a preset temperature.

[0117] S02: Based on the standard radiation brightness value and the second radiation brightness value, determine a radiation correction parameter, where the radiation correction parameter is used to correct the first radiation brightness value and the third radiation brightness value.

[0118] As an example, when the standard radiation brightness value of the standard black body material 27 is the standard radiation brightness under an ideal state, the radiation correction parameter can be determined based on the standard radiation brightness value and the second radiation brightness value, so that in the subsequent testing of the first light and the third light, the first radiation brightness value and the third radiation brightness value are corrected to improve the accuracy and objectivity of the testing of the first radiation brightness value and the third radiation brightness value.

[0119] In some embodiments, before the step of extracting the first light emitted by the target melt material 28 in the first cavity 600 at a preset temperature, the step further includes: moving the radiation detection device to the light-emitting side of the first cavity 600 so that the first light or the second light is incident on the radiation detection device.

[0120] As an example, the radiation detection device can be moved to the light-emitting side of the first cavity 600 by using, but not limited to, a sliding guide rail and a movable structure, and the extension direction of the sliding guide rail is the direction from the first cavity 600 to the second cavity 700. The movable structure, the radiation detection module 400 is fixed on the movable structure, the movable structure is movably connected to the sliding guide rail, and the movable structure is used to drive the optical path adjustment module to move along the extension direction of the sliding guide rail.

[0121] In some embodiments, before the step of extracting the third light emitted by the target melt material 28 in the second cavity 700 , the step further includes: moving the radiation detection device to the light exit side of the second cavity 700 so that the third light is incident on the radiation detection device.

[0122] As an example, the radiation detection device can be moved to the light-emitting side of the second cavity 700 by using, but not limited to, a sliding rail and a movable structure, and the extension direction of the sliding rail is the direction from the first cavity 600 to the second cavity 700. The movable structure, the radiation detection module 400 is fixed on the movable structure, the movable structure is movably connected to the sliding rail, and the movable structure is used to drive the optical path adjustment module to move along the extension direction of the sliding rail.

[0123] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features of the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0124] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. An in-situ temperature measurement device for an additive molten pool, characterized in that: include: A first light extraction module, located in the first cavity, for extracting a first light emitted by the target melt material in the first cavity at a preset temperature; A second light extraction module, located in the first cavity, for extracting a second light emitted by a standard black body material at a preset temperature; A third light extraction module, located in the second cavity, for extracting a third light emitted by the target melt material in the second cavity; a radiation detection module, used to determine a radiation brightness value corresponding to the incident light according to at least one of the light brightness and the light intensity of the incident light, the radiation detection module being used to receive the first light, the second light and the third light, wherein the radiation brightness value of the first light is a first radiation brightness value, the radiation brightness value of the second light is a second radiation brightness value, and the radiation brightness value of the third light is a third radiation brightness value; An analysis module, configured to determine the radiation emissivity of the target melt material at the preset temperature according to the first radiation brightness value and the second radiation brightness value; The temperature determination module is used to determine the current real temperature of the target melt material in the second cavity according to the radiation emissivity and the third radiation brightness value.

2. The in-situ temperature measurement device for additive molten pool according to claim 1, characterized in that: The radiation detection module includes a first state and a second state. In the first state, the radiation detection module is used to receive the first light or the second light. In the second state, the radiation detection module is used to receive the third light. The in-situ temperature measuring device for the additive molten pool also includes: The transport module, the first cavity and the second cavity are located on a fixed side of the transport module, the radiation detection module is located on a movable side of the transport module, and the transport module is used to adjust the position of the radiation detection module to switch the use state of the radiation detection module.

3. The in-situ temperature measurement device for an additive molten pool according to claim 2, characterized in that: The transport module comprises: A sliding guide rail, wherein the extending direction of the sliding guide rail is the direction from the first cavity to the second cavity; A movable structure, the radiation detection module is fixed on the movable structure, the movable structure is movably connected to the sliding guide rail, and the movable structure is used to drive the optical path adjustment module to move along the extension direction of the sliding guide rail.

4. The in-situ temperature measurement device for additive molten pool according to claim 1, characterized in that: The radiation detection module comprises: A light intensity radiation detection module, used to determine the radiation brightness value of the incident light according to the light intensity of the incident light; and / or, The brightness radiation detection module is used to determine the radiation brightness value of the incident light according to the light brightness of the incident light.

5. The in-situ temperature measurement device for additive molten pool according to claim 4, characterized in that: The light intensity radiation detection module comprises: A photoelectric detector is used to determine the radiation brightness value of the incident light according to the number of electrons generated by the incident light within a preset time length.

6. The in-situ temperature measurement device for additive molten pool according to claim 4, characterized in that: The brightness radiation detection module comprises: The spectrum detector is used to determine the radiation brightness value of the incident light according to the spectrum information of the incident light.

7. The in-situ temperature measurement device for additive molten pool according to claim 1, characterized in that: Also includes: A temperature detection module is used to receive the first light, the second light and the third light, and the temperature detection module is used to determine the current radiation temperature of the incident light according to the brightness of the incident light, wherein the temperature detection module includes an infrared thermal imager.

8. An in-situ temperature measurement method for an additive melt pool, characterized in that: include: Extracting a first light beam emitted by a target melt material in a first cavity at a preset temperature; Extracting a second light emitted by a standard black body material at a preset temperature; extracting a third light ray emitted by the target melt material in the second cavity; Determine, by a radiation detection device, a radiation brightness value corresponding to the incident light according to at least one of the light brightness and the light intensity of the incident light, wherein the radiation brightness value of the first light is a first radiation brightness value, the radiation brightness value of the second light is a second radiation brightness value, and the radiation brightness value of the third light is a third radiation brightness value; Determining the radiation emissivity of the target melt material at the preset temperature according to the first radiation brightness value and the second radiation brightness value; The current real temperature of the target melt material in the second cavity is determined according to the radiation emissivity and the third radiation brightness value.

9. The in-situ temperature measurement method for an additive melt pool according to claim 8, characterized in that: Before the step of extracting the first light emitted by the target melt material in the first cavity at a preset temperature, the method further includes: Obtaining a standard radiation brightness value of the standard black body material at the preset temperature; Based on the standard radiation brightness value and the second radiation brightness value, a radiation correction parameter is determined, and the radiation correction parameter is used to correct the first radiation brightness value and the third radiation brightness value.

10. The in-situ temperature measurement method for an additive melt pool according to claim 8, characterized in that: Before the step of extracting the first light emitted by the target melt material in the first cavity at a preset temperature, the method further includes: Moving the radiation detection device to the light exiting side of the first cavity so that the first light or the second light is incident on the radiation detection device; Before the step of extracting the third light emitted by the target melt material in the second cavity, the method further includes: The radiation detection device is moved to the light exiting side of the second cavity so that the third light is incident on the radiation detection device.

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