CN108152107A - A kind of 3D printing analogue simulation is heat-shrinked parameter measuring apparatus with metal material - Google Patents

Abstract

The invention relates to a measuring device for thermal shrinkage parameters of metal materials for 3D printing simulation, including a data acquisition and analysis system, a displacement sensor, a slider, a bolt, a thermocouple, and a T-shaped slot. The T-shaped slot is used to hold a metal melt. The slider is located in the T-shaped slot and can slide along the T-shaped slot. The bolt is connected to the slider. When in use, the bolt extends into the metal melt. The displacement sensor is connected with the slider to collect the displacement data of the slider, the thermocouple is arranged in the T-shaped groove, and is used to collect the temperature change data of the melt in the T-shaped groove, and the data acquisition and analysis system is connected with the displacement sensor and thermocouple connection, receive and process the collected temperature data and displacement data, and finally determine the temperature-displacement relationship curve during the metal solidification process, so as to characterize the thermal shrinkage parameters of the metal material. The invention can be used for measuring the heat shrinkage parameters of metals and their alloys.

Description

A measuring device for thermal shrinkage parameters of metal materials for 3D printing simulation

technical field

The invention relates to a measuring device for heat shrinkage parameters of metal materials used for 3D printing simulation, and belongs to the technical field of additive manufacturing numerical simulation simulation. Specifically, it is to meet the collection of measurement data of material parameters required in the simulation calculation and modeling process in the field of additive manufacturing.

Background technique

Since the development of additive manufacturing technology, due to its unique advantages in the manufacture of metal parts with complex structures and expensive materials, as well as small-batch customized production, metal 3D printing technology has attracted widespread attention in academia and industry around the world. Attention, its processed parts and products have also been successfully used in aviation, aerospace, medical and other fields.

In the metal 3D printing process, the metal powder material is rapidly melted under the action of a high-energy focused heat source, and then cooled and solidified into shape. During this rapid heating and cooling process, the thermophysical process between the molten metal and the solidified metal layer As well as the interaction with the metal powder, the convection effect inside the melt, the heat radiation effect on the surface of the melt, the diffusion and escape behavior of the gas in the melt during solidification, and the local shrinkage of the metal material during the solidification process, all of which will affect the final The microstructure and mechanical properties of 3D printed parts have a crucial influence.

The thermophysical interaction process of metal melts in the 3D printing process is often carried out on a microscopic scale, and the interaction between them is also very complex, which is difficult to observe and study through traditional detection methods. This has severely restricted the understanding of the microstructure control, internal defect formation, and deformation and cracking of 3D printed parts in the current metal 3D printing process.

In recent years, with the continuous development of material science and computing technology, computer simulation technology has attracted more and more attention. Through the integrated calculation and simulation technology, it is possible to intuitively solve the temperature, thermal stress and other problems involved in the 3D printing process, such as the distribution of the temperature field, the size of the molten pool, the solidification cooling rate, the distribution of thermal stress, and the size and distribution of internal residual stress Wait. These thermophysical process parameter information are of vital reference for the study of material microstructure evolution, internal defect formation, structural deformation, and the interaction mechanism between them during the 3D printing process.

Simulation technology has received more and more attention at home and abroad in terms of 3D printing process optimization, and has gradually developed into one of the core methods to solve bottleneck problems such as residual stress, deformation and cracking of 3D printed parts, and the simulation calculation results are highly dependent on Therefore, it is particularly important to measure the thermodynamic parameters of metal materials through experiments.

Contents of the invention

The object of the present invention is to provide a measuring device for thermal shrinkage parameters of metal materials used for 3D printing simulation in order to overcome the above-mentioned defects in the prior art. The device of the invention can measure the heat shrinkage parameters of the metal melt, and provide basic data for subsequent 3D printing simulation, data modeling and other processes.

The core idea of the present invention is: measure the displacement of the slider during the solidification process of the metal melt through the displacement sensor, and measure the change of the melt temperature at the same time, and then the data acquisition and analysis system performs subsequent data analysis and processing according to the temperature-displacement curve. Get the thermal shrinkage related parameters of the metal material.

The purpose of the present invention can be achieved through the following technical solutions:

A device for measuring heat shrinkage parameters of metal materials for 3D printing simulation, including a data acquisition and analysis system, a displacement sensor, a slider, a bolt, a thermocouple, and a T-shaped slot, the T-shaped slot is used to hold a metal melt, and the The slider is located in the T-shaped slot and can slide along the T-shaped slot. The bolt is connected to the slider. When in use, the bolt extends into the metal melt. When the metal melt solidifies and shrinks, the bolt drives the slider to slide. The displacement sensor is connected with the slider to collect the displacement data of the slider. The thermocouple is arranged in the T-shaped groove to collect the temperature change data of the melt in the T-shaped groove. The data acquisition and analysis system is connected with the displacement sensor and The thermocouple is connected to receive and process the collected temperature data and displacement data.

In one embodiment of the present invention, a water cooling base is arranged under the T-shaped slot.

In one embodiment of the present invention, the water-cooled base adopts a water-cooled copper base.

In one embodiment of the present invention, a groove is formed on the water-cooling base, and a T-shaped groove is formed by inserting a sheet into the groove.

In one embodiment of the present invention, the material of the slider, the bolt and the T-slot is graphite.

In one embodiment of the present invention, the surfaces of the sliders, bolts, and T-slots are coated.

In one embodiment of the present invention, the data acquisition and analysis system is a computer with a data acquisition card and built-in LABVIEW software.

The invention adopts the water-cooled base and the T-shaped groove to form the metal melt solidification channel, and the melt will solidify rapidly under the action of water cooling. When the melt solidifies, the bolts with a certain diameter inserted into the melt will drive the graphite to slide. The blocks move with the melt. Then the displacement of the graphite slider is measured by the displacement sensor, and at the same time, the thermocouple collects the temperature change data of the melt in the T-shaped groove, and the data acquisition and analysis system is connected with the displacement sensor and the thermocouple, and receives the collected temperature data and Displacement data, and processed, and finally determine the temperature and displacement relationship curve in the process of metal solidification, so as to characterize the thermal shrinkage parameters of metal materials. The invention can be used for measuring the heat shrinkage parameters of metals and their alloys.

Description of drawings

Fig. 1 is the schematic structural diagram of the front view of the metal material thermal shrinkage parameter measurement device for 3D printing simulation in Example 1;

Fig. 2 is a schematic diagram of the top view of the metal material heat shrinkage parameter measurement device for 3D printing simulation in Example 1;

FIG. 3 is the temperature-displacement curve collected in Example 1.

The numbers in the figure show: 1 is the data acquisition and analysis system, 2 is the displacement sensor, 3 is the water-cooled base, 4 is the slider, 5 is the bolt, 6 is the thermocouple, and 7 is the T-slot.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

Example

A device for measuring heat shrinkage parameters of metal materials for 3D printing simulation, as shown in Figures 1 and 2, comprising a data acquisition and analysis system 1, a displacement sensor 2, a slider 4, a bolt 5, a thermocouple 6 and a T-shaped slot 7, The T-shaped slot 7 is used to hold the molten metal. The slider 4 is located in the T-shaped slot 7 and can slide along the T-shaped slot 7. The bolt 5 is connected to the slider 4. When in use, the bolt 5 extends into the metal melt. When the metal melt solidifies and shrinks, the bolt 5 drives the slider 4 to slide, the displacement sensor 2 is connected to the slider 4 to collect the displacement data of the slider 4, and the thermocouple 6 is arranged in the T-shaped groove 7 to collect the T-shaped For the temperature change data of the melt in the tank 7, the data acquisition and analysis system 1 is connected with the displacement sensor 2 and the thermocouple 6 to receive and process the collected temperature data and displacement data.

Wherein, a water cooling base 3 is arranged under the T-shaped slot 7 . The water-cooled base 3 adopts a water-cooled copper base. There is a groove on the water-cooling base 3, and a T-shaped groove 7 is formed by inserting a sheet into the groove. Slide block 4, bolt 5, T-shaped slot 7 are made of graphite.

In one embodiment of the present invention, the data acquisition and analysis system 1 is a computer including a data acquisition card and built-in LABVIEW software.

The invention adopts the water-cooled base and the T-shaped groove to form the solidification channel of the metal melt. The melt will solidify rapidly under the action of water cooling. When the melt solidifies, the bolts with a certain diameter inserted into the melt will drive the graphite to slide The blocks move with the melt. Then the displacement of the graphite slider is measured by the displacement sensor. At the same time, the thermocouple 6 collects the temperature change data of the melt in the T-shaped groove 7. The data acquisition and analysis system 1 is connected with the displacement sensor 2 and the thermocouple 6 to receive the collected temperature data. and displacement data, and processed to finally determine the temperature-displacement relationship curve during the metal solidification process, so as to characterize the thermal shrinkage parameters of the metal material. The invention can be used for measuring the heat shrinkage parameters of metals and their alloys.

Using the above-mentioned device to test the aluminum alloy material, the melt pouring temperature is 750°C, and the measurement data is recorded to 100°C. The temperature-displacement curve obtained after processing according to the measurement data is shown in Figure 3. In Figure 3, Δl _exp is pre-expansion displacement, is the non-equilibrium solidification stage displacement, is the start temperature of solidification shrinkage, and TCC is the linear solidification shrinkage segment. It can be seen that the entire solidification curve of aluminum alloy can be divided into three sections, the pre-expansion stage with increased displacement, the liquid phase contraction stage, and the solid phase contraction stage, which conform to the general principle of metal liquid phase solidification and have high measurement accuracy. It can provide accurate thermal shrinkage data of metal materials for 3D printing simulation.

The above descriptions of the embodiments are for those of ordinary skill in the art to understand and use the invention. It is obvious that those skilled in the art can easily make various modifications to these embodiments, and apply the general principles described here to other embodiments without creative efforts. Therefore, the present invention is not limited to the above-mentioned embodiments. Improvements and modifications made by those skilled in the art according to the disclosure of the present invention without departing from the scope of the present invention should fall within the protection scope of the present invention.

Claims (6)

1. a kind of 3D printing emulation simulates metal material heat shrinkage parameter measuring device, it is characterized in that, comprises data acquisition and analysis system (1), displacement sensor (2), slide block (4), bolt (5), thermocouple ( 6) and a T-slot (7), the T-slot (7) is used to hold the molten metal, the slider (4) is located in the T-slot (7), and can move along the T-slot (7) sliding, the bolt (5) is connected to the slider (4), and the bolt (5) extends into the metal melt during use, and the bolt (5) drives the slider (4) to slide when the metal melt solidifies and shrinks, so Described displacement sensor (2) is connected with slide block (4), is used for collecting the displacement data of slide block (4), and described thermocouple (6) is arranged in T-shaped groove (7), is used for collecting T-shaped groove ( 7) For the temperature change data of the inner melt, the data acquisition and analysis system (1) is connected with the displacement sensor (2) and the thermocouple (6), receives and processes the collected temperature data and displacement data. 2. The device for measuring thermal shrinkage parameters of metal materials for 3D printing simulation according to claim 1, characterized in that a water-cooled base (3) is arranged below the T-shaped slot (7). 3. A device for measuring thermal shrinkage parameters of metal materials for 3D printing simulation according to claim 2, characterized in that, the water-cooled base (3) is provided with a groove, which is formed by inserting a sheet into the groove T-slot (7). 4. A kind of 3D printing emulation simulation according to claim 1 uses metal material thermal shrinkage parameter measuring device, is characterized in that, described slider (4), bolt (5), T-shaped groove (7) material adopts graphite . 5. The device for measuring heat shrinkage parameters of metal materials for 3D printing simulation according to claim 1, characterized in that, the surface of the material of the slider (4), the bolt (5), and the T-slot (7) is Coating treatment. 6. The device for measuring thermal shrinkage parameters of metal materials for 3D printing simulation according to claim 1, wherein the data collection and analysis system (1) is a computer with a data collection card and built-in LABVIEW software.