A multi-material interlayer intra-layer dual composite digital differential sanding device and method

Abstract

The application provides a multi-material interlayer and intra-layer double-composite digital differential sanding device, which comprises a plurality of combined lifting sand dischargers, a sanding printing device, a forming platform, a support frame, a base and a detection sand supplementing device, wherein the plurality of combined lifting sand dischargers are composed of a sand scraping plate, a plurality of combined sand storage boxes, a motor and a spiral sand feeder, the sanding printing device is composed of a printing nozzle, a sand A storage box, a sand B storage box, a gradient mixed sanding box, a scraping plate, a twisting mechanism, a heating pipe and an extrusion stirring device, and the detection sand supplementing device is composed of a detection device and a sand supplementing device. The multi-material casting obtained by the device has excellent performance, the thermal physical property parameters of each part change uniformly in gradient, which is beneficial to uniform heat dissipation of the casting and collapse of the sand mold during pouring, fully plays the advantages of multi-material heat transfer and heat storage, and realizes high-throughput preparation of the continuous gradient transition layer of the multi-material sand mold.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of sand 3D printing, and particularly relates to a multi-material interlayer and intralayer double-composite digital differential sand laying device and method. BACKGROUND

[0002] Sand 3D printing technology is an important branch of additive manufacturing technology, and its principle is to discretely slice a designed three-dimensional model of a casting mold, convert three-dimensional manufacturing into simple two-dimensional laminated manufacturing, lay sand layer by layer, and spray adhesive according to the shape information of each layer to obtain the final casting product. It is mainly used for manufacturing sand molds with complex shapes, and saves the mold design and manufacturing time in the traditional sand mold manufacturing process.

[0003] In sand casting, the thermal physical parameters of sand mold materials have a significant impact on the organization and performance of the casting and forming. Therefore, with the development of sand 3D printing technology, multi-material printing has attracted more and more attention. Multi-material sand 3D printing is to lay different types of sand in different sand layers during sand printing, and to control the thermal physical parameters of different positions of the sand mold to achieve uniform heat dissipation of each part during casting, thereby improving the performance of the casting. In the current printing equipment, the laying of multi-material sand molds mostly uses direct superposition of different types of sand. There is no intermediate transition layer at the contact part of the two sand layers, which causes the thermal physical parameters of different printing layers to change instantaneously, and the gradient transition effect is not good, which is not conducive to the uniformity of the overall mold performance. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a multi-material interlayer and intralayer double-composite digital differential sand laying device, which can uniformly lay and print two types of sand, and form a multi-gradient transition layer in the middle of the two sand layers. The multi-material composite is realized in the interlayer and the multi-material composite sand layer is also formed in the intralayer, so as to realize the uniform transition and effective combination of the performance of different parts of the mold.

[0005] To solve the above technical problems, the technical scheme adopted by the present application is as follows: a multi-material interlayer and intralayer double-composite digital differential sand laying device, characterized in that it comprises a plurality of combined sand laying devices, a sand laying and printing device, a forming platform, a support frame, a base and a sand detection and supplementing device. The support frame is fixedly installed on both sides of the base, the top surface of the base is fixedly connected with the forming platform, one side of the forming platform is provided with a first motor for driving the forming platform to ascend and descend, the sand outlet of the sand laying and printing device is located above the forming platform, two guide rails are arranged on the top surface of the support frame, and the sand laying and printing device and the sand detection and supplementing device are installed on the same guide rail of the support frame and move synchronously.

[0006] The multi-combination lifting sand extractor comprises a sand scraping plate, a multi-combination sand storage box, a second motor and a spiral sand feeder, the sand scraping plate is slidably arranged on the multi-combination sand storage box, the sand scraping plate is driven to move by a third motor, the second motor is arranged on one side of the multi-combination sand storage box, the output shaft of the second motor is coaxially and fixedly connected with the spiral sand feeder, and the sand outlet of the spiral sand feeder is communicated with the sand laying printing device.

[0007] The detection sand supplementing device comprises a detection device and a sand supplementing device.

[0008] Preferably, the sand laying printing device is composed of three sand laying printing modules, sand A laying boxes, sand B laying boxes and gradient mixed sand laying boxes are arranged in the three sand laying printing modules respectively, printing nozzles and scrapers are arranged on the sand A laying boxes, the sand B laying boxes and the gradient mixed sand laying boxes, a twisting mechanism is arranged in the gradient mixed sand laying box, and a heating pipe is arranged in the gradient mixed sand laying box.

[0009] Preferably, the gradient mixed sand laying box is divided into a plurality of independent micro sand laying boxes, sand A and sand B mixed in different proportions are respectively arranged in the plurality of micro sand laying boxes, and the height of the micro sand laying box is 1 / 5 of the height of the sand A laying box or the sand B laying box.

[0010] Preferably, the sand A laying boxes, the sand B laying boxes and the gradient mixed sand laying boxes are arranged horizontally or in a stepped manner, and extrusion stirring devices are arranged in the sand A laying boxes and the sand B laying boxes to promote sand dropping by rotating extrusion.

[0011] Preferably, a twisting mechanism is arranged at the bottom of the gradient mixed sand laying box to control the sand laying flow of each micro sand laying box, and a heating pipe is arranged at the sand outlet of each micro sand laying box to make the sand fall onto the forming platform more uniformly and smoothly.

[0012] Preferably, independent sand storage spaces are arranged in the multi-combination sand storage box, and various sand A, sand B and mixed sand in different proportions used by the sand laying printing device are respectively arranged in the sand storage spaces, a fourth motor is connected to the inner bottom plate of the sand storage space, and the sand is discharged from the sand storage space by driving the inner bottom plate to move upward.

[0013] Preferably, a detection head is arranged on the detection device, and a sand supplementing box is arranged in the sand supplementing device.

[0014] A multi-material interlayer and intralayer double-composite digital micro sand laying method comprises the following steps:

[0015] S1, selecting appropriate two kinds of sand according to the type of the casting, mixing the two kinds of sand in different proportions to obtain mixed sand, and performing layering and slicing processing on a casting mold geometric model to obtain two-dimensional slicing information of each layer;

[0016] S2, respectively, the sand into a plurality of combination sand storage box, through the host computer program control sand in the designated sand box upward movement, sand plate driven sand from the transport to the spiral sand feeder, through the spiral sand feeder rotation extrusion sand delivery to the corresponding sand laying box;

[0017] S3, sand laying box filled with sand after opening the print job, sand laying printing device from left to right according to the set speed uniform motion, open twist mechanism, heating tube and extrusion stirring device, sand B sand laying box first sand laying, sand scraping and printing operation, printing is completed after the gradient mixed sand laying box in turn sand forming gradient sand layer, and through the sand, printing complete gradient mixed sand printing operation, then sand A sand laying box sand laying, sand scraping and printing operation;

[0018] S4, sand laying printing device moves to the right side, complete three layers of sand sand printing operation, forming platform moves down three layer thickness distance, detection sand filling device and sand laying printing device return to the initial position, open detection sand filling function during movement, repair the printing plane defect position;

[0019] S5, repeat the sand laying printing steps of S2-S4, until the completion of the printing job of the preset mold;

[0020] S6, take out the printed multi-material gradient mixed sand mold, clean the workbench.

[0021] Preferably, the type of sand is any two of silica sand, zircon sand, chromite sand, ceramsite sand, magnesia sand and olivine sand.

[0022] Preferably, the gradient mixed sand layer obtained by stacking each differential sand laying box in the multi-gradient mixed sand laying box is uniformly sprayed with an adhesive for printing.

[0023] Compared with the prior art, the present application has the following advantages:

[0024] 1. The present application realizes the gradient and uniform transition of different differential sand layers in the layer on the basis of the equal thickness sand layer of the traditional sand laying device, and realizes the preparation of high-throughput sand laying layer.

[0025] 2. The present application realizes the storage and delivery of multiple types of sand through the multi-combination lifting sand discharger, improves the degree of automation of the sand laying printing process, and improves the interlayer sand laying precision.

[0026] 3. The present application improves the use performance of the whole mold, promotes the uniform cooling of the cast part, and improves the collapse performance of the mold by preparing interlayer and intralayer double composite sand laying layer.

[0027] The present application will be further described in detail below with reference to the accompanying drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is the overall structural schematic diagram of the present application.

[0029] Figure 2 is the bottom view structural schematic diagram of the sand laying printing device in the present application.

[0030] Figure 3 is the top view structural schematic diagram of the sand laying printing device in the present application.

[0031] Figure 4 is the structural schematic diagram of the multi-combination lifting sand discharger in the present application.

[0032] Figure 5 is the structural schematic diagram of the sand detecting and supplementing device in the present application.

[0033] Figure 6 is the cross-sectional schematic diagram of the sand laying printing layer in the present application.

[0034] BRIEF DESCRIPTION OF DRAWINGS

[0035] 1 - multi-combination lifting sand discharger; 2 - sand laying printing device; 3 - forming platform;

[0036] 4 - support frame; 5 - base; 6 - sand detecting and supplementing device;

[0037] 7 - printing nozzle; 8 - sand A laying box; 9 - gradient mixed sand laying box;

[0038] 10 - sand B laying box; 11 - scraper; 12 - twisting mechanism;

[0039] 13 - heating pipe; 14 - extrusion stirring device; 15 - sand scraping plate;

[0040] 16 - multi-combination sand storage box; 17 - second motor; 18 - spiral sand feeder;

[0041] 19 - detecting device; 20 - sand supplementing device. DETAILED DESCRIPTION

[0042] Example 1

[0043] As Figures 1-6As shown, the embodiment provides a multi-material interlayer in-layer double-composite digital differential sanding device, which comprises a plurality of combined lifting sand dischargers 1, a sanding printing device 2, a forming platform 3, a support frame 4, a base 5, and a detection sand supplementing device 6. The support frame 4 is fixedly installed on both sides of the base 5. The top surface of the base 5 is fixedly connected with the forming platform 3. A first motor for driving the forming platform to lift is installed on one side of the forming platform 3. The sand outlet of the sanding printing device 2 is located above the forming platform 3. Two guide rails are arranged on the top surface of the support frame 4. The sanding printing device 2 and the detection sand supplementing device 6 are installed on the same guide rail of the support frame 4 and move synchronously. The detection sand supplementing device 6 is fixedly connected with the sanding printing device 2 and moves synchronously.

[0044] The plurality of combined lifting sand dischargers 1 comprise a sand scraping plate 15, a plurality of combined sand storage boxes 16, a second motor 17, and a spiral sand feeder 18. The sand scraping plate 15 is slidably installed on the plurality of combined sand storage boxes 16. The sand scraping plate 15 is driven to move by a third motor. The second motor 17 is installed on one side of the plurality of combined sand storage boxes 16. The output shaft of the second motor 17 is coaxially fixedly connected with the spiral sand feeder 18. The sand outlet of the spiral sand feeder 18 is communicated with the sanding printing device 2.

[0045] The detection sand supplementing device 6 comprises a detection device 19 and a sand supplementing device 20.

[0046] In the embodiment, the sanding printing device 2 is composed of three sanding printing modules. Sand A sanding boxes 8, sand B sanding boxes 10, and gradient mixed sanding boxes 9 are arranged in the three sanding printing modules, respectively. The sand A sanding boxes 8, the sand B sanding boxes 10, and the gradient mixed sanding boxes 9 are all provided with printing nozzles 7 and scraping plates 11. A twisting mechanism 12 is arranged in the gradient mixed sanding boxes 9. A heating pipe 13 is arranged in the gradient mixed sanding boxes 9.

[0047] In the embodiment, the gradient mixed sanding boxes 9 are divided into a plurality of mutually independent differential sanding boxes. The plurality of differential sanding boxes respectively contain 1:4, 2:3, 1:1, 3:2, and 4:1 mixed sand A and sand B. The height of the differential sanding boxes is 1 / 5 of the height of the sand A sanding boxes 8 and the sand B sanding boxes 10.

[0048] In the embodiment, the sand A sanding boxes 8, the sand B sanding boxes 10, and the gradient mixed sanding boxes 9 are arranged horizontally or in a stepped manner. Extrusion agitating devices 14 are installed in the sand A sanding boxes 8 and the sand B sanding boxes 10 to promote sand dropping by rotating extrusion of the extrusion agitating devices 14.

[0049] In this embodiment, the gradient mixed sand laying box 9 is provided with a twisting mechanism 12 at the bottom to control the sand laying flow of each micro-sand laying box to change between 0.1mm and 2mm, and a heating pipe 13 is installed at the sand outlet of each micro-sand laying box to heat the sand more uniformly and smoothly to the forming platform 3 by 800W-1200W power.

[0050] In this embodiment, the multiple combination sand storage box 16 is provided with independent sand storage spaces, and multiple types of sand A, sand B and mixed sand with different proportions used by the sand laying printing device 2 are stored in the sand storage spaces respectively. The inner bottom plate of the sand storage space is connected with a fourth motor, and the fourth motor drives the inner bottom plate to move upwards to make the sand leave the sand storage space.

[0051] In this embodiment, the detection device 19 is provided with a detection head, and the sand supplementing device 20 is provided with a sand supplementing box. The detection head of the detection device 19 is an industrial camera, which can collect the surface topography information of the sand laying surface for image analysis and defect judgment. The sand supplementing device contains a type of sand. The detection and sand supplementing are realized by controlling the detection sand supplementing device and the printing device to move simultaneously. The detection camera can capture the surface topography information of the sand laying printing surface in real time, feed back to the upper computer for analysis, and obtain the defect information. Then, the sand supplementing device is controlled to move to the defect position for sand supplementing through program instructions.

[0052] Embodiment 2

[0053] The embodiment provides a method for multi-material interlayer and intra-layer double-composite digital micro-sand laying, which comprises the following steps:

[0054] S1, according to the type of casting, chrome iron sand and silica sand are selected, and the two types of sand are mixed in a proportion of 1:4, 2:3, 1:1, 3:2 and 4:1 respectively to obtain mixed sand for use. The casting geometric model is subjected to layering and slicing treatment to obtain two-dimensional slicing information of each layer, and the printing speed is set to 45mm / s, and the sand laying thickness of each layer is 0.5mm;

[0055] S2, the sand is placed in the multiple combination sand storage box 16 respectively, the sand in the specified sand storage box is moved upwards through the program control of the upper computer, the sand is driven from the conveying to the spiral sand conveyor 18 by the sand scraping plate 15, and the sand is conveyed to the corresponding sand laying box through the rotation and extrusion of the spiral sand conveyor 18;

[0056] S3, after the sand box is filled with sand, the printing operation is started, the sand printing device 2 moves at a constant speed of 45 mm / s from left to right, the sand outlet width of the twisting mechanism 12 is set to 0.1 mm, the twisting mechanism 12, the heating pipe 13 and the extrusion stirring device 14 are started, the sand box 10 first performs sanding, scraping and printing operations, the printing thickness is 0.5 mm, after the printing is completed, the gradient mixed sand box 9 sequentially falls sand to form a 0.1*5 mm thick gradient sand layer, and the gradient mixed sand printing operation is completed through scraping and printing, then the chromite sand sanding box performs sanding, scraping and printing operations, and the printing layer thickness is 0.5 mm;

[0057] S4, when the sand printing device 2 moves to the rightmost position, the sand printing operation of the three layers of sand is completed, the forming platform 3 moves downward by 1.5 mm, the detection sand supplementing device 6 and the sand printing device 2 return to the initial position at the same time, the detection sand supplementing function is started during the movement process, and the printing plane defect position is repaired;

[0058] S5, the sand printing steps of S2-S4 are repeated until the printing operation of the preset mold is completed.

[0059] S6, the printed multi-material gradient mixed sand mold is taken out, and the workbench is cleaned.

[0060] In the embodiment, the gradient mixed sand layer obtained by stacking each differential sanding box in the multi-gradient mixed sanding box 9 after sanding is uniformly sprayed with an adhesive for printing.

[0061] The above is only a preferred embodiment of the present application, and does not limit the present application. Any simple modification, change and equivalent change made according to the technical essence of the application to the above embodiment are still within the protection scope of the technical solution of the present application.

Claims

1. A multi-material interlayer in-layer dual composite digital differential sanding device, characterized in that, The utility model provides a kind of sanding device, including multiple combination lifting sand extractor (1), sanding printing device (2), forming platform (3), support frame (4), base (5) and detect sand filling device (6), the support frame (4) is fixedly installed in base (5) both sides, the base (5) top surface is fixedly connected with forming platform (3), the first motor of driving forming platform lifting is installed in the side of forming platform (3), the sand outlet of sanding printing device (2) is located above forming platform (3), the top surface both sides of support frame (4) are provided with two guide rails, sanding printing device (2) and detect sand filling device (6) are installed on the same guide rail of support frame (4) and move synchronously; The sanding printing device (2) is composed of three sanding printing modules, sand A sanding box (8), sand B sanding box (10) and gradient mixed sanding box (9) are arranged in the three sanding printing modules respectively, the gradient mixed sanding box (9) is divided into a plurality of independent micro sanding boxes, a plurality of micro sanding boxes respectively contain different proportions of sand A and sand B, the height of the micro sanding box is 1 / N of the height of the sand A sanding box (8) and the sand B sanding box (10). The multiple combination lifting sand extractor (1) includes a sand scraping plate (15), a multiple combination sand storage box (16), a second motor (17) and a spiral sand feeder (18), the sand scraping plate (15) is slidably installed on the multiple combination sand storage box (16), the sand scraping plate (15) is driven to move by the third motor, the second motor (17) is installed on one side of the multiple combination sand storage box (16), the output shaft of the second motor (17) is coaxially fixedly connected with the spiral sand feeder (18), and the sand outlet of the spiral sand feeder (18) is communicated with the sanding printing device (2). The detection sand filling device (6) includes a detection device (19) and a sand filling device (20).

2. A multi-material interlayer in-die dual composite digital differential sanding device according to claim 1, wherein, The sand A sanding box (8), the sand B sanding box (10) and the gradient mixed sanding box (9) are provided with a printing nozzle (7) and a scraper (11), the gradient mixed sanding box (9) is provided with a twisting mechanism (12), and the gradient mixed sanding box (9) is provided with a heating pipe (13).

3. A multi-material interlayer in-die dual composite digital differential sanding device according to claim 2, wherein, The sand A sanding box (8), the sand B sanding box (10) and the gradient mixed sanding box (9) are arranged horizontally or in a stepped manner, and the sand A sanding box (8) and the sand B sanding box (10) are provided with an extrusion stirring device (14) to promote sand falling by rotating extrusion of the extrusion stirring device (14).

4. A multi-material interlayer in-die dual composite digital differential sanding device according to claim 3, wherein, The gradient mixed sanding box (9) is provided with a twisting mechanism (12) at the bottom to control the sanding flow of each micro sanding box, and a heating pipe (13) is installed at the sand outlet of each micro sanding box to make the sand fall more uniformly and smoothly onto the forming platform (3).

5. A multi-material interlayer in-die dual composite digital differential sanding device according to claim 1, wherein, The multiple combination sand storage box (16) is provided with independent sand storage spaces, and the sand storage spaces respectively store various sand A, sand B and different proportion mixed sand used by the sanding printing device (2), and the inner bottom plate of the sand storage space is connected with a fourth motor, so that the sand is separated from the sand storage space by driving the inner bottom plate to move upward.

6. A multi-material interlayer in-die dual composite digital differential sanding device according to claim 1, wherein, The detection device (19) is provided with a detection head, and the sand supplementing device (20) is provided with a sand supplementing box.

7. A method of accomplishing multi-material interlaminar in-situ dual composite digital differential layup using the multi-material interlaminar in-situ dual composite digital differential layup apparatus of any one of claims 1-6, wherein, The method comprises the following steps: S1, selecting two types of sand suitable for the casting type, mixing the two types of sand in different proportions to obtain mixed sand, and performing layering slicing processing on a casting geometric model to obtain two-dimensional slicing information of each layer; S2, placing the sand into a plurality of combined sand storage boxes (16), moving the sand in the specified sand storage box upward under the control of an upper computer program, driving the sand from the conveying to the spiral sand conveyor (18) by the sand scraping plate (15), and conveying the sand to the corresponding sand laying box by rotating and extruding the spiral sand conveyor (18); S3, after the sand laying box is filled with sand, starting the printing operation, moving the sand laying and printing device (2) at a uniform speed from left to right according to the set speed, starting the twisting mechanism (12), the heating pipe (13) and the extrusion stirring device (14), the sand B sand laying box (10) first performs sand laying, sand scraping and printing operation, and then the gradient mixed sand laying box (9) sequentially drops sand to form a gradient sand layer, and the sand laying, sand scraping and printing operation of the gradient mixed sand is completed through sand scraping and printing, and then the sand A sand laying box (8) performs sand laying, sand scraping and printing operation; S4, when the sand laying and printing device (2) moves to the rightmost side, the sand laying and printing operation of the three layers of sand is completed, the forming platform (3) moves downward by a distance of three layer thickness, the detection sand supplementing device (6) and the sand laying and printing device (2) return to the initial position at the same time, and the detection sand supplementing function is started during the movement process to repair the defect position of the printing plane; S5, repeating the sand laying and printing steps of S2-S4 until the printing operation of the preset casting mold is completed; S6, taking out the printed multi-material gradient mixed sand mold and cleaning the workbench.

8. A multi-material interlayer in-die dual composite digital differential sanding method as defined in claim 7, wherein, The types of sand are any two of silica sand, zircon sand, chromite sand, ceramsite sand, magnesia sand and olivine sand.

9. A multi-material interlayer in-die dual composite digital differential sanding method as defined in claim 7, wherein, The gradient mixed sand layer obtained by stacking the sand in each micro sand laying box in the multi-gradient mixed sand laying box (9) is uniformly sprayed with an adhesive for printing.

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