Measuring device and method for regulating and controlling growth direction of metal droplets under inclined surface

Abstract

The invention discloses a measuring device and method for regulating and controlling the growth direction of metal molten drops under an inclined surface. The measuring device comprises a molten drop generating device, a substrate temperature regulating and controlling device, a substrate inclination adjusting device, a high-speed camera, a three-dimensional motion platform, a high-speed camera, an infrared point temperature instrument, a thermocouple temperature measuring instrument, an information acquisition system and the like. An inclined substrate platform with a variable temperature field is made through a substrate inclination adjusting device and a substrate temperature regulating and controlling device, molten metal drops are dropped on the inclined substrate platform with the variable temperature field, and monitoring systems such as a high-speed camera and a temperature measuring device are adopted. According to the method, the forming and temperature detection and feedback of the metal molten drop solidification process are realized, the change of the molten drop solidification effect under different parameters is obtained according to an information acquisition system, the morphology change of the molten drop under different temperature fields and different gradients is analyzed, and a measurement method for regulating and controlling the growth direction of the metal molten drop under the inclined surface is established. Therefore, the growth direction of the metal molten drops on the inclined surface can be accurately regulated and controlled.

Description

Technical Field

[0001] The invention relates to the field of metal solidification forming measurement, in particular to the field of regulating the growth direction of metal molten droplets on an inclined surface. Background Art

[0002] Metal droplet additive manufacturing is an advanced manufacturing technology, also known as 3D printing metal. It manufactures parts by stacking molten metal powder layer by layer, with a high degree of design freedom and customization. It is widely used in aerospace, automobile manufacturing, medical equipment and other fields. Inclined surface metal droplet additive manufacturing is a special metal additive manufacturing technology, which is mainly used to manufacture parts with inclined surfaces or complex geometries. In some special fields, such as aerospace and medical device manufacturing, inclined surface metal droplet additive manufacturing technology has important application prospects.

[0003] However, in traditional metal droplet additive manufacturing, since the droplets can only be stacked in the horizontal direction, some difficulties will be encountered when manufacturing parts with inclined surfaces. The existing inclined surface metal droplet additive manufacturing controls the spray direction and angle of the droplets so that the droplets can be stacked along the inclined surface, thereby realizing the manufacturing of inclined surface parts. This technology can improve the manufacturing efficiency and quality of parts, and also expand the application scope of metal droplet additive manufacturing. However, its control complexity is relatively high, requiring a precise control system and parameter adjustment. The control process for complex parts is cumbersome, and the stability and consistency of the droplet stacking are not easy to control. Therefore, it is urgent to accurately measure the solidification process of the metal droplets on the inclined surface to achieve precise control of the droplet solidification, thereby realizing the additive manufacturing forming control on the inclined surface. Summary of the invention

[0004] The present invention provides a measuring device and method for regulating the growth direction of molten metal droplets under an inclined surface, which are used to study the effects of inclination angle and different temperature distributions on the flow and solidification of molten metal droplets, eliminate the influence of gravity on the solidification of molten metal droplets under an inclined surface, achieve precise regulation of the growth direction of molten metal droplets, and provide technical support for directional additive manufacturing of molten metal droplets under an inclined surface.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A measuring device for regulating the growth direction of a molten metal droplet under an inclined surface comprises a molten metal generating device, a CCD camera, an infrared spot thermometer, a thermocouple temperature measuring and collecting device, an inclination adjusting device, a variable temperature field heating device, a data acquisition control system and a temperature control system; wherein the molten metal generating device is used to generate a molten metal droplet of a specific temperature, the variable temperature field heating device realizes a variable temperature field distribution on a substrate by means of a resistance heating rod and a heat insulating material, the inclination of the substrate is adjusted and the substrate is moved by the inclination adjusting device, the solidification process and temperature change of the molten metal droplet are measured by the CCD camera and the thermocouple temperature measuring and collecting device, and the growth direction of the molten metal droplet under the inclined surface is analyzed in combination with the data acquisition control system.

[0007] By setting the temperature and mass of the metal droplet in the acquisition control system, the infrared point thermometer is used to measure the metal droplet generated by the metal droplet generation device without contact, and the temperature is fed back to achieve precise control of the temperature of the metal droplet; the heating rod in the substrate heating device is heated to different temperatures by resistance heating, and the heat insulation material rod is used between the heating devices to isolate the temperature conduction, and the three-dimensional motion platform is controlled to combine substrates with different temperature distributions, and the heat insulation material is used to isolate the heat conduction between the substrates, so as to achieve variable temperature distribution; the thermocouple temperature measuring device is used to measure the distribution of different temperatures, and the heating temperature of different substrates is changed to achieve quantification of the variable temperature distribution. The inclination of the platform is adjusted by the inclination adjustment device to form a substrate platform with a variable temperature distribution with an inclination angle, and the metal droplet is dropped on the substrate platform, the solidification process of the metal droplet is monitored by a CCD camera, and the temperature change of the droplet solidification process is measured by a thermocouple temperature measuring device. Combined with the influence of temperature distribution and inclination angle on the growth direction of the droplet, the growth direction of the metal droplet is accurately measured, thereby achieving precise control of the solidification direction of the metal droplet under the inclination angle.

[0008] A method for measuring and controlling the growth direction of a metal droplet under an inclined surface comprises the following steps:

[0009] Firstly, different heating methods are used to make the container of the metal droplet device contain liquid metal, and the metal droplets are generated by the metal generating device. The temperature of the metal droplets is measured by an infrared thermometer to realize real-time temperature monitoring of the metal droplets.

[0010] The inclination adjustment device adjusts the inclination of the platform by rotating the motor to adjust the inclination to a certain angle; the temperature of the heating rods in the two variable temperature heating devices is adjusted to achieve individual temperature control of each heating rod, and thermal insulation materials are used to suppress the temperature conduction. The two variable temperatures are combined through a three-dimensional motion platform and isolated by thermal insulation materials. A thermocouple temperature collector is used to measure the distribution of the variable temperature, thereby achieving variable temperature distribution at the falling position of the metal droplet.

[0011] After the generated metal droplets fall, a CCD camera and a thermocouple temperature collector are used to monitor the flow process of the metal droplets on the inclined surface and the temperature changes after contacting the substrate, and the effects of different inclination angles and variable temperature distributions on the forming morphology of the metal droplets are analyzed.

[0012] By adopting a data acquisition control system to analyze the measurement results of the morphology of the metal molten droplet, the changes in the morphology of different molten droplets are analyzed, and the relationship between the inclination angle and temperature gradient on the molten droplet morphology is combined, the inclination angle and temperature gradient under the required molten droplet growth direction are formulated to achieve precise control of the molten droplet growth direction.

[0013] Preferably, the metal droplet is obtained by a droplet generating device, and the temperature of the metal droplet can be accurately obtained by infrared spot temperature measurement. The infrared spot temperature non-contact temperature measurement method protects the initial shape of the droplet and accurately measures the temperature of the droplet.

[0014] Preferably, the substrate presents a variable temperature distribution, and is heated by a segmented distributed resistance heating method. The temperature of the heating rods in the heating device is individually regulated, and the temperatures of different heating rods are isolated by insulating material rods to prevent temperature interference between the heating plates. The variable temperature distribution is moved through a three-dimensional mobile platform, and the two heating devices are isolated by insulating materials. At the same time, the variable temperature is monitored by laying thermocouples on the substrate for temperature measurement and collection.

[0015] Preferably, the measuring device uses a CCD camera, a thermocouple temperature measurement acquisition and an infrared point thermometer to jointly monitor the generation and solidification process of the molten droplet and the temperature change. Through the measurement results, the change in the solidification size of the molten droplet at different temperatures is formed.

[0016] The beneficial effects of adopting the above technical solution are:

[0017] (1) The present invention solves the problem of regulating the solidification and forming of molten metal droplets on inclined surfaces, and the problem of the difficulty in regulating the solidification and forming of molten metal droplets in the process of complex angle additive manufacturing. The temperature and quality of molten metal droplets are regulated by protecting the morphology of molten metal droplets. The molten metal droplets are attached to the substrate by adjusting the bevel angle and adding variable temperature. The solidification morphology changes of the molten metal droplets are observed by a CCD camera, and the flow of the molten metal droplets and the solidification morphology changes are measured. According to the measurement results, the solidification and forming of the molten metal droplets are regulated by adjusting the temperature of the molten metal droplets, the tilt angle of the substrate, and the temperature distribution of the substrate, thereby realizing the precise regulation of the growth direction of the molten metal droplets at the tilt angle.

[0018] (2) The present invention uses infrared point temperature to monitor the temperature of the molten metal droplets, and feeds back the temperature changes of the molten metal droplets to the molten metal generating device to control the molten metal droplets, thereby ensuring accurate temperature control of the molten metal droplets.

[0019] (3) The tilted substrate device with a variable temperature field of the present invention adjusts the inclination angle through a control system, sets different temperatures for the heating rods using resistance heating, uses insulation materials to insulate different heating devices to prevent heat conduction between different temperatures, adjusts the distance between the heating devices through a three-dimensional motion platform, measures the temperature of the temperature field through a thermocouple temperature measuring device, and feeds back the temperature measurement information to the control system, so as to regulate the heating device to achieve a stable temperature field distribution.

[0020] (4) The present invention monitors the solidification forming process of the molten metal droplets on the inclined surface by means of coordinated measurement of the metal droplet generation temperature, the solidification forming process and the substrate temperature distribution. According to the information fed back by the measurement, the molten metal temperature, the substrate inclination angle and the substrate temperature distribution are regulated by an integrated control system, thereby achieving precise control of the growth direction of the molten metal droplets on the inclined surface.

[0021] The present invention is described in detail below in conjunction with specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The present invention is a structural schematic diagram of a measuring device for regulating the growth direction of a molten metal droplet under an inclined surface, and the accompanying drawings are marked as follows: 1-metal molten metal droplet generating device, 2-CCD camera, 3-infrared point thermometer, 4-thermocouple temperature measuring collector, 5-metal molten metal droplet, 6-substrate, 7-three-dimensional motion platform, 8-thermal insulation material, 9-data acquisition control system, 10-variable temperature heating device, 11-tilt adjustment device.

[0023] Figure 2 It is a structural schematic diagram of the heating device.

[0024] The reference numerals are as follows: 6 - substrate, 12 - heating resistor rod, 13 - thermal insulation material rod, 14 - temperature control system. DETAILED DESCRIPTION

[0025] The content of the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0026] like Figure 1 and Figure 2As shown, a measuring device system for regulating the growth direction of metal droplets under an inclined surface includes a metal droplet generating device, an infrared point thermometer, a CCD camera, a thermocouple temperature collector, a data acquisition control system, a variable temperature heating device, an inclination adjustment device, a heating resistor rod, an insulation material rod, and a temperature control system.

[0027] Among them, for the metal droplets generated by the droplet generation device, the temperature of the metal droplets is measured by an infrared spot thermometer, and the measured temperature is fed back to the data acquisition system, which is regulated according to the temperature value to accurately measure the temperature of the droplets. Different heating devices are heated to different temperature ranges. Insulation materials are used between different heating devices for insulation. The distance between the heating devices is adjusted by a three-dimensional motion platform. The temperature of the substrate is measured by thermocouple temperature measurement to achieve a variable temperature field distribution. The inclination is adjusted by an inclination adjustment device to form a certain angle. The variable temperature field substrate is moved to just below the metal droplet. After the droplet falls onto the substrate, a high-speed camera and a thermocouple collector are used to collect the solidification morphology and temperature change of the metal droplet. The droplet temperature, substrate inclination angle and temperature distribution are changed to measure the droplet morphology. According to the measurement results of the metal droplet morphology under variable parameters, the influence of the droplet temperature, substrate inclination angle and temperature distribution on the metal droplet is analyzed, and a measurement method for regulating the growth direction of the metal droplet under an inclined surface is established to achieve precise regulation of the growth direction of the metal droplet under an inclined surface.

[0028] The variable temperature heating device includes a heating resistor rod, a heat insulation material rod, and a temperature control system. The temperature of different heating rods is changed by the temperature control system to realize a variety of heating rods with different temperatures. Heat insulation materials are added between the heating rods and the heating device to realize the distribution of variable temperature. The substrate temperature is measured by thermocouple acquisition, and the measurement results are fed back to the control system. The heating parameters are adjusted according to the data, thereby realizing the variable temperature field distribution of the substrate.

[0029] The specific implementation is as follows: the method of the present invention is used to control the growth direction of the metal droplet under the inclined surface, including the following steps:

[0030] Step 1. Open the droplet generating device, put aluminum alloy in it, generate aluminum alloy solution and aluminum alloy droplets by adjusting relevant parameters, set the aluminum alloy droplet temperature to 650℃, measure the aluminum alloy droplet temperature with an infrared point thermometer, adjust the droplet heating device according to the infrared detected temperature value to ensure that the temperature of the metal droplet is 650℃.

[0031] Step 2. Adjust the inclination angle to 30° through the inclination adjustment device, and adjust the temperature of the variable temperature heating device. Distribute the variable temperature heating device from bottom to top according to 25°C, 50°C, 25°C, 650°C, 600°C, 500°C, and 400°C, among which 650°C and 600°C on the temperature distribution platform are insulated with 0.1mm thermal insulation material, and move the variable temperature heating device through the three-dimensional motion platform so that its thermal insulation material is directly below the metal droplet. Measure the substrate temperature through thermocouple temperature measurement, and adjust the heating device through the temperature control system according to the measured temperature distribution to eliminate the heat loss caused by air.

[0032] Step 3. After the molten metal drop falls, the solidification process of the molten metal drop is recorded by a high-speed camera (CCD camera), and the temperature change of the molten metal drop after combining with the substrate during the solidification process is collected by a thermocouple collector. It is monitored that when the gravity of the molten metal drop is eliminated, the growth direction of the molten metal drop is perpendicular to the substrate.

[0033] Step 4. Based on the measurement results in step 3, the morphology and temperature changes of the molten drop during the solidification process are analyzed through the information acquisition system. The three parameters of the molten drop temperature, substrate inclination angle and temperature distribution are changed to analyze the solidification process and temperature changes of the metal molten drop under different parameters. By studying the influence of different parameters on the solidification morphology of the metal molten drop, the influence mechanism of the solidification morphology of the metal molten drop under the inclined surface is established, and a measurement method for the growth direction of the metal molten drop on the inclined surface of the aluminum alloy molten drop is formed, thereby realizing the precise control of the growth direction of the aluminum alloy molten drop on the inclined surface.

Claims

1. A measuring device for regulating the growth direction of a metal droplet under an inclined surface, characterized in that: It includes a molten droplet generating device, a CCD camera, an infrared spot thermometer, a thermocouple temperature measuring and collecting device, an inclination adjusting device, a variable temperature field heating device, a data acquisition control system and a temperature control system; wherein, the molten droplet generating device is used to generate metal molten droplets of a specific temperature, the variable temperature field heating device realizes variable temperature field distribution on the substrate by means of resistance heating rods and heat insulation materials, the inclination of the substrate is adjusted and the substrate is moved by the inclination adjusting device, the solidification process and temperature change of the metal molten droplet are measured by the CCD camera and the thermocouple temperature measuring and collecting device, and the data acquisition control system is combined to realize the analysis of the growth direction of the metal molten droplet under the inclined surface.

2. The measuring device for controlling the growth direction of a metal droplet under an inclined surface according to claim 1, characterized in that: By setting the temperature and mass of the molten metal droplet in the acquisition and control system, the molten metal droplet generated by the molten metal droplet generating device is measured contactlessly by using an infrared spot thermometer, and the temperature is fed back to realize the precise control of the temperature of the molten metal droplet; the heating rod in the substrate heating device is heated to different temperatures by using resistance heating, and the temperature conduction is isolated by using a heat insulating material rod between the heating devices, and the three-dimensional motion platform is controlled to combine substrates with different temperature distributions, and the heat conduction between the substrates is isolated by using a heat insulating material, so as to realize the variable temperature distribution; the distribution of different temperatures is measured by using a thermocouple temperature measuring device, and the heating temperature of different substrates is changed to achieve the quantification of the variable temperature distribution; the inclination of the platform is adjusted by using an inclination adjustment device to form a substrate platform with a variable temperature distribution with an inclination, and the molten metal droplet is dropped on the substrate platform, the solidification process of the molten metal droplet is monitored by a CCD camera, and the temperature change of the molten metal droplet solidification process is measured by using a thermocouple temperature measuring device, and the influence of the temperature distribution and the inclination angle on the growth direction of the molten metal droplet is combined to realize the precise measurement of the growth direction of the molten metal droplet, thereby realizing the precise control of the solidification direction of the molten metal droplet under the inclination angle.

3. A method for measuring the growth direction of a metal droplet under an inclined surface using the device of claim 1, characterized in that: The following steps are involved: Firstly, different heating methods are used to make the container of the metal droplet device contain liquid metal, a metal droplet is generated by a metal generating device, and an infrared thermometer is used to measure the temperature of the metal droplet to realize real-time temperature monitoring of the metal droplet; The inclination adjustment device adjusts the inclination of the platform, and the inclination is adjusted to a certain angle by rotating the motor; the temperature of the heating rods in the two variable temperature heating devices is adjusted to achieve independent temperature control of each heating rod, and the heat insulation material is used to suppress the temperature conduction, and the two variable temperatures are combined through the three-dimensional motion platform, which is isolated by the heat insulation material, and the distribution of the variable temperature is measured by the thermocouple temperature collector, so as to achieve the variable temperature distribution at the falling position of the metal droplet; After the generated metal droplets fall, a CCD camera and a thermocouple temperature collector are used to monitor the flow process of the metal droplets on the inclined surface and the temperature changes after contacting the substrate, and analyze the effects of different inclination angles and variable temperature distribution on the forming morphology of the metal droplets. By adopting a data acquisition control system to analyze the measurement results of the morphology of the metal molten droplet, the changes in the morphology of different molten droplets are analyzed, and the relationship between the inclination angle and temperature gradient on the molten droplet morphology is combined, the inclination angle and temperature gradient under the required molten droplet growth direction are formulated to achieve precise control of the molten droplet growth direction.

4. The method for measuring the growth direction of a metal droplet under an inclined surface according to claim 3, characterized in that: The molten metal droplet is obtained by a molten metal droplet generating device, and the temperature of the molten metal droplet can be accurately obtained by using infrared point temperature. The non-contact temperature measurement method of infrared point temperature protects the initial shape of the molten metal droplet and accurately measures the temperature of the molten metal droplet.

5. The method for measuring the growth direction of a metal droplet under an inclined surface according to claim 3, characterized in that: The substrate presents variable temperature distribution, and is heated by segmented distributed resistance heating. The temperature of the heating rods in the heating device is individually regulated, and insulation material rods are used to isolate the temperatures of different heating rods to prevent temperature interference between heating plates. The variable temperature distribution is moved through a three-dimensional mobile platform, and the two heating devices are isolated by insulation materials. The variable temperature is monitored by laying thermocouples on the substrate for temperature measurement and collection.

6. The method for measuring the growth direction of a metal droplet under an inclined surface according to claim 3, characterized in that: The measuring device uses a CCD camera, a thermocouple temperature measurement and acquisition, and an infrared spot thermometer to jointly monitor the generation and solidification process of the molten metal droplets and the changes in temperature. Through the measurement results, the changes in the solidification size of the molten metal droplets at different temperatures are formed.

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