Freezing sand mold flexible guide micro-channel forming device and method

Abstract

The invention relates to a frozen sand mold flexible guide micro-channel forming device and a frozen sand mold flexible guide micro-channel forming method. The device comprises a sand box positioning working platform; the prefabricated refrigeration sand blank forming box is positioned and placed on the sand box positioning working platform; the pre-stabbing micro-channel flexible device comprises a micro-channel assembly and a driving device for driving the micro-channel assembly to move along the X axis, the Y axis and the Z axis, the micro-channel assembly comprises a needle head seat, a needle head array, a pre-puncturing guide plate and an elastic element, wherein the needle head array is mounted on the needle head seat and comprises a plurality of pre-puncturing needle heads, the pre-puncturing guide plate is connected to the pre-puncturing needle heads in a sliding manner, and the elastic element is arranged between the pre-puncturing guide plate and the needle head seat; and the elastic element is used for providing a force for the pre-needling guide plate to be far away from the needle head seat. According to the invention, high-precision pre-pricking operation of the micro-channel can be realized, the time of blank making and pricking is greatly shortened, and the production efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of sand mold 3D printing, and in particular to a frozen sand mold flexible guide micro-channel forming device and method. Background Art

[0002] In recent years, 3D printing technology has shown its great potential and broad application prospects in many fields. 3D printing technology, also known as additive manufacturing technology, is a technology that stacks materials layer by layer based on digital models to form a three-dimensional entity. It breaks through the limitations of traditional manufacturing technology and can achieve rapid manufacturing of complex shapes and structures. In the 3D sand mold printing process, the application of freezing process is an innovation. Through freezing treatment, the shape and structure of the sand mold can be fixed, while reducing the deformation and shrinkage of the material during the printing process. This helps to achieve higher precision sand mold manufacturing and improve the quality of castings.

[0003] The frozen sand mold flexible guide microfluidic forming device and control method came into being in such a technical background. This method combines the advantages of 3D printing technology and frozen sand casting technology, and realizes a microfluidic device with flexible guide function by accurately controlling the amount of cutting material in the 3D printing process and the cooling and solidification process of the frozen sand mold.

[0004] However, there are still many technical challenges to overcome in 3D printing microfluidic devices, such as how to ensure the position accuracy of the microfluidic channel and the smoothness of the sand mold surface to achieve stable gas flow; how to design a reasonable microfluidic structure to meet specific experimental needs; and how to effectively control the gas in the microfluidic channel to achieve frozen sand mold subtractive processing in the 3D printing direction.

[0005] Therefore, in the context of the rapid development of microfluidic technology and the continuous advancement of 3D printing technology, it is urgently necessary to solve the problems faced by large-sized frozen sand blanks, such as long freezing time, high cost, and difficult demolding, and to develop new methods and new devices to achieve rapid freezing of frozen sand molds, convenient demolding, and low-cost forming. Summary of the invention

[0006] To this end, the present invention provides a frozen sand mold flexible guide microfluidic channel forming device and method, which not only improves the time and energy consumption problems in the early and mid-term of frozen sand mold manufacturing, but also reduces production costs, enhances the adaptability and stability of the system, and brings significant technological progress and economic benefits to the sand mold manufacturing industry.

[0007] In order to solve the above technical problems, the present invention provides a frozen sand mold flexible guide microchannel forming device, comprising: Sand box positioning work platform; A prefabricated refrigerated sand blank forming box is positioned and placed on the sand box positioning work platform; A pre-puncture microfluidic channel flexible device comprises a microfluidic channel component and a driving device for driving the microfluidic channel component to move along three axes: X, Y and Z; Wherein, the microfluidic assembly includes a needle seat, a needle array installed on the needle seat and comprising multiple pre-puncture needles, a pre-puncture guide plate slidably connected to each of the pre-puncture needles, and an elastic element arranged between the pre-puncture guide plate and the needle seat, and the elastic element is used to provide a force for the pre-puncture guide plate to move away from the needle seat.

[0008] In one embodiment of the present invention, the prefabricated refrigerated sand blank forming box includes a forming box body and a thermal insulation layer wrapped around the box body, a gap filled with cold air is left between the thermal insulation layer and the side wall of the forming box body, the side wall of the forming box body is provided with micro holes for cold air to penetrate into the sand mold, and the gap is connected to the refrigeration device.

[0009] In one embodiment of the present invention, the forming box is made of Teflon material to avoid sand sticking when the sand blank is frozen and formed.

[0010] In one embodiment of the present invention, the plurality of pre-puncture needles are of the same length and are distributed in a rectangular array.

[0011] In one embodiment of the present invention, a positioning block for placing the prefabricated refrigerated sand blank forming box is provided on the sand box positioning work platform.

[0012] In one embodiment of the present invention, the driving device includes a Z-axis driving component that drives the microfluidic component to move along the Z-axis, an X-axis driving component that drives the lifting driving component to move along the X-axis direction, and a Y-axis driving component that drives the X-axis driving component to move along the Y-axis.

[0013] In one embodiment of the present invention, the X-axis drive assembly and / or the Y-axis drive assembly adopts a linear module; the Z-axis drive assembly adopts a servo electric cylinder.

[0014] In one embodiment of the present invention, the elastic element comprises a compression spring sleeved outside the pre-puncture needle head, which can prevent floating sand of the sand blank from being brought out when the needle is retracted.

[0015] In one embodiment of the present invention, each of the pre-puncture needles is connected to the needle seat via a threaded joint.

[0016] The present invention also provides a method for forming a frozen sand mold flexible guide microchannel, using the frozen sand mold flexible guide microchannel forming device, the method comprises: Mix the sand material and the binder evenly to form a sand mixture; The sand mixture is loaded into the prefabricated refrigerated sand blank forming box and frozen to form a sand mold; In computer-aided design software, a three-dimensional model corresponding to the sand mold is established, and the required microchannel arrangement is determined by simulation according to the three-dimensional model, and a simulation of tool processing is performed to determine the motion trajectory of the tool, wherein the motion trajectory includes the tool processing path and the processing depth; Converting the motion trajectory into inching motion parameters of the needle array; According to the inching motion parameters, the micro-channel assembly is controlled to move, so as to realize the micro-channel forming on the surface of the sand blank.

[0017] The above technical solution of the present invention has the following advantages compared with the prior art: The present invention discloses a frozen sand mold flexible guide microfluidic channel forming device and method. By combining the precise control of the linear module and the servo stroke electric cylinder, the present invention can realize high-precision pre-puncture operation of the microfluidic channel, greatly shorten the time for blank puncturing, and improve production efficiency.

[0018] The present invention ensures that the sand blank has reliable positioning and support during the processing under freezing conditions by firmly placing the prefabricated refrigerated sand blank forming box on the sand box positioning work platform. The pre-puncture microfluidic flexible device is composed of a microfluidic assembly and a multi-axis drive, which can perform targeted needle insertion operations on the sand blank. A plurality of pre-puncture needles are distributed on the needle seat. With the help of the elastic element and the pre-puncture guide plate, flexible up and down movement can be achieved in the Z-axis direction to meet the acupuncture requirements of different depths and different positions. The overall integration is high, and the sand blank positioning, freezing and microfluidic forming functions can be integrated into the same device to avoid multiple handling. The microfluidic assembly can move in three-axis directions and perform acupuncture, which can meet the processing requirements of sand blanks of various shapes and different areas.

[0019] The forming box of the present invention adopts an inner and outer double-layer structure, wherein the inner layer is the box body and the outer layer is the heat-insulating material. A gap area is left between the two layers, and the refrigeration device can input cold air into the gap. Through the micro holes preset in the side wall of the box, the cold air slowly and evenly penetrates into the interior of the sand blank, thereby maintaining a low-temperature environment for the entire sand blank.

[0020] During processing, the sand blank is protected by a stable low-temperature environment, which can reduce deformation or cracking; and the surface of the Teflon box is not easy to stick to the sand blank, which provides convenience for subsequent removal or flipping of the sand blank.

[0021] The design of the flexible pre-puncture microfluidic channel device of the present invention allows the needle to be adjusted in depth and position according to different sand mold shapes and requirements, and needles and guide plates of different sizes can be replaced, further enhancing the flexibility and adaptability of the device.

[0022] The present invention ensures the accuracy and stability of processing through real-time monitoring and adjustment, makes the control of acupuncture depth and density more precise, and can maintain the accuracy and stability of the acupuncture template even in the secondary deep cooling process.

[0023] The flexible guide microchannel design device for frozen sand molds and the control method thereof of the present invention are not only innovative, but also can achieve the purpose of rapid refrigeration of frozen sand molds in practical applications, save energy consumption, and improve economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments of the present invention in conjunction with the accompanying drawings.

[0025] Figure 1 It is a schematic structural diagram of the frozen sand mold flexible guide microchannel forming device of the present invention.

[0026] Figure 2 It is a partial view of the microfluidic component of the present invention.

[0027] Figure 3 It is a top view of the frozen sand mold flexible guide microchannel forming device of the present invention.

[0028] Figure 4 for Figure 3 Screenshot at the middle AA.

[0029] Figure 5 The present invention is a flow chart of the method for forming a frozen sand mold flexible guide microchannel.

[0030] Description of the Figures in the Specification: 101. Y-axis drive assembly; 102. Linear module; 103. X-axis drive assembly; 104. Crossbeam; 105. Mounting bracket; 106. Z-axis drive assembly; 107. Connecting plate; 108. Pre-puncture needle; 109. Elastic element; 110. Pre-puncture guide plate; 111. Forming box; 112. Insulation layer; 113. Prefabricated refrigerated sand blank forming box; 114. Sand box positioning work platform; 115. Metal frame; 116. Positioning block. DETAILED DESCRIPTION

[0031] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0032] In the present invention, when directions (up, down, left, right, front, and back) are described, it is only for the convenience of describing the technical solution of the present invention, rather than indicating or implying that the technical features referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0033] In the present invention, the meaning of "several" is one or more, the meaning of "multiple" is two or more, and "greater than", "less than", "exceeding", etc. are understood to exclude the base number; "above", "below", "within", etc. are understood to include the base number. In the description of the present invention, if "first" and "second" are described, they are only for the purpose of distinguishing technical features, and should not be understood as indicating or implying relative importance or implicitly indicating the quantity of the technical features indicated or the sequence relationship of the technical features indicated.

[0034] In the present invention, unless otherwise clearly defined, words such as "arranged", "installed", "connected", etc. should be understood in a broad sense. For example, they can be directly connected, or indirectly connected through an intermediate medium; they can be fixedly connected, or detachably connected, or integrally formed; they can be mechanically connected, or electrically connected or capable of communicating with each other; they can be the communication inside two components or the interaction relationship between two components. Those skilled in the art can reasonably determine the specific meaning of the above words in the present invention in combination with the specific content of the technical solution.

[0035] Embodiment 1 Referring to Figures 1 to 4 as shown, a flexible guiding microchannel forming device for frozen sand molds of the present invention includes: A sand box positioning working platform 114; A prefabricated refrigerated sand blank forming box 113, which is positioned and placed on the sand box positioning working platform 114; A pre-piercing microchannel flexible device, including a microchannel assembly and a driving device for driving the microchannel assembly to move along the X, Y, and Z axes; Among them, the microchannel assembly includes a needle seat, a needle array installed on the needle seat and including multiple pre-piercing needles 108 (microchannel needles), a pre-piercing guide plate 110 slidably connected to each of the pre-piercing needles 108, and an elastic element 109 arranged between the pre-piercing guide plate 110 and the needle seat. The elastic element 109 is used to provide a force for the pre-piercing guide plate 110 to move away from the needle seat.

[0036] The device can ensure that the sand blank has reliable positioning and support during the processing under freezing conditions by firmly placing the prefabricated refrigerated sand blank forming box 113 on the sand box positioning work platform 114. The pre-puncture microfluidic flexible device is composed of a microfluidic assembly and a multi-axis drive, which can perform targeted needle insertion operations on the sand blank. A plurality of pre-puncture needles 108 are distributed on the needle holder. With the help of the elastic element 109 and the pre-puncture guide plate 110, flexible up and down movement can be achieved in the Z-axis direction to meet the acupuncture needs of different depths and different positions.

[0037] Specifically, the prefabricated refrigerated sand blank forming box 113 includes a forming box body 111 and an insulation layer 112 wrapped around the box body. A gap (specifically 25 mm) filled with cold air is left between the insulation layer 112 and the side wall of the forming box body 111. The side wall of the forming box body 111 is provided with micro holes for cold air to penetrate into the sand mold to ensure the low temperature environment of the frozen sand mold. The gap is connected to the refrigeration device. The refrigeration device can input cold air into the gap. Through the preset micro holes on the side wall of the box body, the cold air slowly and evenly penetrates into the interior of the sand blank, thereby maintaining the low temperature environment of the entire sand blank. During processing, the sand blank is protected by a stable low temperature environment, which can reduce deformation or cracking.

[0038] Exemplarily, in order to achieve uniform freezing of the sand blank, the refrigeration device is used to realize the circulation path of cold air, and the cold air is output from the refrigeration main unit and enters the side wall gap layer of the forming box 111 through the cold air delivery pipeline. The gap layer surrounds the four sides of the forming box 111 to ensure that the cold air can evenly cover the entire outside of the sand blank. The micropores on the side wall of the box can guide the cold air to slowly and evenly penetrate into the inside of the sand blank, thereby achieving the establishment of a low-temperature environment from the outside to the inside. The distribution density and pore size of the micropores can be adjusted according to the volume and material properties of the sand blank to ensure the uniformity of the cold air penetration speed and penetration depth. After the cold air completes the cooling process inside the sand blank, it is discharged through the exhaust port at the top or bottom of the box. In addition, multiple temperature sensors are arranged at different positions of the box to monitor the temperature changes inside the box and various areas of the sand blank in real time. Sensor types include thermocouples or infrared thermometers, which can be selected according to different accuracy requirements.

[0039] Specifically, the forming box 111 is made of Teflon (PTFE) material to avoid sand sticking when the sand blank is frozen and formed. Teflon is selected as the main material of the forming box 111 because of its extremely low surface energy and excellent chemical inertness. Sand blanks are prone to hardening during the freezing process. If ordinary metal or plastic materials are used, they may adhere tightly to the solidified sand blank. Teflon has a smooth surface and a low friction coefficient, which can significantly reduce the phenomenon of sand sticking or sand jamming.

[0040] Specifically, the plurality of pre-puncture needles 108 have the same length and are distributed in a rectangular array. In order to form a uniformly distributed or specifically structured microchannel on a large area of ​​sand blank, the plurality of pre-puncture needles 108 can be arranged in a rectangular grid to facilitate uniform control of their lifting position and depth. In addition, the same length of the needles can make it easier to achieve synchronous depth insertion during the overall needle insertion process.

[0041] Specifically, a positioning block 116 for placing the prefabricated refrigerated sand blank forming box 113 is provided on the sand box positioning work platform 114. The forming box 111 can be limited or precisely positioned in the X and Y directions to prevent the box from being offset under the action of the servo motor or external force. The relative position of the sand blank and the pre-puncture needle 108 can be ensured to be stable, thereby improving the accuracy of microchannel processing.

[0042] Specifically, the driving device includes a Z-axis driving assembly 106 for driving the microfluidic assembly to move along the Z axis, an X-axis driving assembly 103 for driving the lifting driving assembly to move along the X axis, and a Y-axis driving assembly 101 for driving the X-axis driving assembly 103 to move along the Y axis. Exemplarily, the X-axis driving assembly 103 and / or the Y-axis driving assembly 101 use a linear module 102; the Z-axis driving assembly 106 uses a servo electric cylinder.

[0043] In this embodiment, in order to achieve flexible movement in three-dimensional directions, a multi-axis serial drive method is adopted in this embodiment. The X-axis drive assembly 103 is installed on the crossbeam 104 of the metal frame 115, and the X-axis drive assembly 103 and the Y-axis drive assembly 101 are installed on the metal frame 115 at the same time. The Z-axis drive assembly 106 is slidably connected to the X-axis drive assembly 103 through the mounting bracket 105, and the Z-axis drive assembly 106 is connected to the needle seat through the connecting plate 107. With this arrangement, the needle array can be arbitrarily positioned in three axes according to the processing path, covering a large range of sand blank areas.

[0044] Specifically, the elastic element 109 includes a compression spring sleeved outside the pre-puncture needle 108, which can prevent the floating sand of the sand blank from being brought out when the needle is withdrawn. In addition, when the needle is inserted into or pulled out of the sand blank, the compression spring can provide a certain buffer force, so that the needle will not excessively pull the surface of the sand blank at the moment of insertion or withdrawal. Therefore, even if the surface of the sand blank is loose, the hole shape of the microchannel can be guaranteed to be intact, reducing the risk of floating sand falling or being brought out.

[0045] Specifically, each of the pre-puncture needles 108 is connected to the needle holder through a threaded joint. This facilitates the disassembly and replacement of the needle. The pre-puncture needles 108 of different sizes and lengths can be replaced according to the different depths and positions of the pre-puncture at various positions of the sand mold. The pre-puncture guide plate 110 can be replaced with different forms according to the different characteristics of the cast sand mold. During maintenance or cleaning, the corresponding needles can also be removed or reinstalled separately.

[0046] Example 2 Reference Figure 5 As shown, this embodiment provides a method for forming a frozen sand mold flexible guide microchannel, using the frozen sand mold flexible guide microchannel forming device, the method includes: S1. Mix the sand material and the binder evenly to form a sand mixture.

[0047] S2, loading the sand mixture into the prefabricated refrigerated sand blank forming box 113, and freezing to form a sand mold.

[0048] Specifically, a refrigeration device is connected to the outer periphery of the box body, so that the sand blank is partially solidified or completely frozen in a low temperature environment. The Teflon material and microporous structure around the box body are used to allow cold air to penetrate into the sand blank from the gap between the insulation layer 112 and the side wall of the box body, ensuring uniform cooling and preventing the sand blank from sticking to the box wall after freezing.

[0049] S3. In computer-aided design software (CAD), a three-dimensional model corresponding to the sand mold is established (the existing sand blank shape can also be three-dimensionally scanned and modeled), and the required microchannel layout (such as the position, shape and corresponding parameters of the microchannel such as width, height, routing distribution, etc.) is determined through simulation based on the three-dimensional model, and tool processing simulation is performed to determine the tool motion trajectory, which includes the tool processing path and processing depth.

[0050] It should be noted that through simulation (such as finite element or fluid analysis), it is also possible to simulate the deformation of the sand mold under different conditions (such as freezing or local heating process) and the fluid dynamics characteristics of the microchannel in the sand mold (pressure distribution, flow rate, etc.).

[0051] In microchannel design, it is necessary to open channels of specific depth and shape on the surface or inside of the frozen sand mold to meet the requirements of airflow or fluid flow; the tool can move according to the trajectory set by the simulation system and process the microchannel at a specified depth.

[0052] In CAM (computer-aided manufacturing) or CNC programming software, the tool processing path can be determined according to the shape of the microchannel, including the starting point, processing route, feed speed, spindle speed, etc. If the sand blank needs to be partially grooved or trimmed, one or more tool motion trajectories for different depths and different areas are generated.

[0053] Through simulation, tool processing can be carried out in advance. According to the requirements of microchannels for fluid flow, the model can be quickly modified and re-simulated, and the tool path can be accurately planned.

[0054] S4, converting the motion trajectory into the inching motion parameters of the needle array.

[0055] The motion path of the designed microfluidic three-dimensional model tool can be further converted into the motion parameters of the pre-puncture needle 108 to ensure the high precision of the position and size of the microfluidic channel. Compared with the continuous processing of the tool, the pre-puncture microfluidic flexible device can perform the lifting movement of the regional matrix distribution, so as to arrange dense micro-through holes or micro-channels in a specific area.

[0056] The motion trajectory and depth information of the tool on the X / Y / Z axes are converted into the inching motion parameters of the needle array, that is, the motion trajectory of the tool is received, and according to the microchannel area division, the continuous processing trajectory is discretized into point-by-point lifting and lowering actions performed by the needle array; and the corresponding insertion and extraction actions are generated for the needle array.

[0057] For example, the tool motion trajectory represents the three-axis (X / Y / Z) path and depth information when continuously cutting or grooving the sand blank; while the inching motion parameters of the needle array refer to the motion instructions for "inserting needles-pulling needles" at different coordinate points and different depths for the discretely arranged multiple pre-puncture needles 108. There are differences in the movement forms of the two, which need to be completed through a conversion or conversion process. First, plan the tool motion path in the CAD / CAM system, including the tool's movement route on the X / Y plane, the Z-axis cutting depth, and the feed speed and other continuous information.

[0058] Discretization is performed to divide the continuous tool trajectory into several tiny areas or grid points according to the microchannel distribution or the target hole grid. At each grid point, the "coordinate position" and "depth" information corresponding to the tool are extracted to determine the coordinates and penetration depth of the needle at that point.

[0059] The needle array can be moved as a whole to a certain grid area at the same time, and then perform a single or multiple "insertion-extraction" action according to the required depth of the grid point.

[0060] By arranging the grid points sequentially or in parallel, a "jog instruction set for the needle array" can be generated, including specific X / Y positions, Z-axis travel (insertion depth), and action sequence and beat time, etc. Finally, the above-mentioned jog instructions are input into a control system such as a PLC or an industrial PC, and the system uniformly dispatches the linear module 102 and servo electric cylinder of the X / Y / Z three axes to make the needle array complete the pre-puncture movement point by point (or row by row, column by column).

[0061] In addition, the tool path can be generated by the CAM software (such as G code files), and the continuous curve / surface can be divided into several finer segments or points by sampling (equidistant or variable pitch) according to the required resolution. Secondary interpolation or fitting is performed on each sampling point to ensure that the sampling points are dense enough when the curvature of the curve changes significantly.

[0062] S5. According to the inching motion parameters, the microchannel assembly is controlled to move to achieve microchannel forming on the surface of the sand blank. The linear module 102 in the X / Y direction is used to move the pre-puncture needle 108 on the horizontal plane; the Z-axis servo electric cylinder is used to drive the needle array to move up and down with high precision; a compression spring is set between the needle and the guide plate to prevent the floating sand from being taken out when the needle is retracted.

[0063] In addition, in order to maintain high-precision microchannel puncture, illustratively, all the above-mentioned planned motion instructions are input into the control system (PLC or industrial PC), and the processing or acupuncture parameters are dynamically adjusted by real-time monitoring of the feedback of the servo motor, electric cylinder and linear module 102. On each drive component, a high-precision encoder or grating ruler is equipped to detect the real-time position and compare it with the target position to achieve closed-loop control. A force sensor can also be set. When the needle insertion resistance is abnormal, the system automatically compensates or reduces the insertion force to prevent the needle from squeezing the sand blank or exceeding the position limit. By fine-tuning the needle position or depth when an error occurs; modifying the needle insertion sequence or speed; and recalculating the acupuncture instructions for the local area. This maintains high precision in subsequent acupuncture steps.

[0064] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0065] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1a device for the functions specified in one or more boxes.

[0066] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory produce a manufactured article including an instruction device, and the instruction device implements the functions specified in the process Figure 1 one process or more processes and / or boxes Figure 1 a function specified in one or more boxes.

[0067] These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process. Therefore, the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in the process Figure 1 one process or more processes and / or boxes Figure 1 a function specified in one or more boxes.

[0068] Finally, it should be noted that the above specific implementation manners are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the examples, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A frozen sand mold flexible guide microchannel forming device, characterized in that: include: Sand box positioning work platform (114); A prefabricated refrigerated sand blank forming box (113) is positioned and placed on the sand box positioning work platform (114); A pre-puncture microfluidic channel flexible device comprises a microfluidic channel component and a driving device for driving the microfluidic channel component to move along three axes: X, Y and Z; The microfluidic assembly comprises a needle seat, a needle array mounted on the needle seat and comprising a plurality of pre-puncture needles (108), a pre-puncture guide plate (110) slidably connected to each of the pre-puncture needles (108), and an elastic element (109) arranged between the pre-puncture guide plate (110) and the needle seat, wherein the elastic element (109) is used to provide a force to move the pre-puncture guide plate (110) away from the needle seat.

2. A frozen sand mold flexible guide microchannel forming device according to claim 1, characterized in that: The prefabricated refrigerated sand blank forming box (113) comprises a forming box body (111) and a heat-insulating layer (112) wrapped around the box body, a gap for filling with cold air is left between the heat-insulating layer (112) and the side wall of the forming box body (111), micro holes are provided on the side wall of the forming box body (111) for cold air to penetrate into the sand mold, and the gap is connected to a refrigeration device.

3. A frozen sand mold flexible guide microchannel forming device according to claim 2, characterized in that: The forming box (111) is made of Teflon material to prevent sand from sticking to the sand blank during freeze forming.

4. A frozen sand mold flexible guide microchannel forming device according to claim 1, characterized in that: The plurality of pre-puncture needles (108) have the same length and are distributed in a rectangular array.

5. A frozen sand mold flexible guide microchannel forming device according to claim 1, characterized in that: The sand box positioning work platform (114) is provided with a positioning block (116) for placing the prefabricated refrigerated sand blank forming box (113).

6. A frozen sand mold flexible guide microchannel forming device according to claim 1, characterized in that: The driving device comprises a Z-axis driving component (106) for driving the microfluidic component to move along the Z axis, an X-axis driving component (103) for driving the lifting driving component to move along the X-axis direction, and a Y-axis driving component (101) for driving the X-axis driving component (103) to move along the Y axis.

7. A frozen sand mold flexible guide microchannel forming device according to claim 6, characterized in that: The X-axis drive assembly (103) and / or the Y-axis drive assembly (101) adopts a linear module (102); and the Z-axis drive assembly (106) adopts a servo electric cylinder.

8. A frozen sand mold flexible guide microchannel forming device according to claim 1, characterized in that: The elastic element (109) comprises a compression spring sleeved outside the pre-puncture needle (108), which can prevent floating sand from the sand blank from being brought out when the needle is retracted.

9. A frozen sand mold flexible guide microchannel forming device according to claim 1, characterized in that: Each of the pre-puncture needles (108) is connected to the needle seat via a threaded joint.

10. A method for forming a frozen sand mold flexible guide microchannel, characterized in that: Utilizing the frozen sand mold flexible guide microchannel forming device according to any one of claims 1 to 8, the method comprises: Mix the sand material and the binder evenly to form a sand mixture; The sand mixture is loaded into the prefabricated refrigerated sand blank forming box (113) and frozen to form a sand mold; In computer-aided design software, a three-dimensional model corresponding to the sand mold is established, and the required microchannel arrangement is determined by simulation according to the three-dimensional model, and a simulation of tool processing is performed to determine the motion trajectory of the tool, wherein the motion trajectory includes the tool processing path and the processing depth; Converting the motion trajectory into inching motion parameters of the needle array; According to the inching motion parameters, the micro-channel assembly is controlled to move, so as to realize the micro-channel forming on the surface of the sand blank.

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