CN105817622A - Single-layer multi-material surface overlay system based on powder bed additive manufacturing - Google Patents

Abstract

A powder bed additive manufacturing single-layer multi-material surface laying system, including a forming worktable, a forming cylinder is arranged in the middle below the forming worktable, two powder supply cylinders are arranged on both sides of the forming cylinder, and above the forming worktable There are two sliding rails configured through the truss mechanism, and the two sliders matched with the two sliding rails are connected with a guide rod, and the bottom end of the guide rod is connected with a powder pressing board, and the two pressing powder boards are respectively controlled by two stepping motors It moves left and right, and the powder pressing board is connected with two control systems respectively. The invention can quickly form parts with any multi-dimensional and multi-material, absorb the powder material to be adsorbed on the powder pressing board, and compact the powder material on the surface of the formed part. , to achieve the effect of improving the density of parts, the mobile surface laying system moves fast, realizes the precise control of the amount of powder spreading, and improves the production efficiency.

Description

A single-layer multi-material surface layup system for powder bed additive manufacturing

technical field

The invention relates to the field of powder bed additive manufacturing, in particular to a powder bed additive manufacturing single-layer multi-material surface layer system.

Background technique

Powder bed additive manufacturing technology is an advanced additive manufacturing technology that uses the powder to be formed to be formed after layer-by-layer powder coating, and then solidified after bonding, sintering or melting. It can realize complex shapes, especially complex inner cavity structures. Manufacturing of precision customized parts.

Compared with single-material additive manufacturing technology, multi-material, especially single-layer multi-material additive manufacturing technology can form parts with complex material properties and geometric properties, thereby achieving the purpose of efficiently improving product performance. However, the existing rapid prototyping machines based on powder bed additive manufacturing technology are usually designed and manufactured based on single-material products, and it is difficult to meet the increasing complexity requirements of industrial products and the flexibility and efficiency requirements required by the market.

Contents of the invention

In order to overcome the shortcomings of the above-mentioned prior art, the object of the present invention is to provide a single-layer multi-material surface lay-up system for powder bed additive manufacturing, so as to realize efficient forming of multi-dimensional multi-material parts with complex material properties and geometric properties. At the same time, it achieves the effect of uniform and dense powder spreading and preheating each layer of powder, so that the powder spreading process is fast and efficient.

In order to achieve the above object, the present invention adopts the following technical solutions:

A single-layer multi-material surface laying system for powder bed additive manufacturing, including a forming work surface 1, a forming cylinder 2 is provided in the middle below the forming work surface 1, and a first powder supply cylinder 3 is provided on both sides of the forming cylinder 2 -1 and the second powder supply cylinder 3-2, the two sides above the forming table 1 are respectively fixedly connected by the connecting plate 4 and the truss mechanism 5, and the truss mechanism 5 is equipped with a first slide rail 8-1 and a second slide rail 8 -2, the first slide rail 8-1 and the second slide rail 8-2 are arranged in parallel in the vertical direction, the first slide rail 8-1 cooperates with the first slide block 11-1, and the first slide block 11-1 The first guide rod 12-1 is connected, and the bottom end of the first guide rod 12-1 is connected with the first powder pressing plate 9; the second slide rail 8-2 cooperates with the second slider 11-2, and the second slider 11 -2 is connected with a second guide rod 12-2, the bottom end of the second guide rod 12-2 is connected with a second powder pressing plate 10, and the first powder pressing plate 9 is connected to one side end of the first slide rail 8-1 The first stepping motor 7-1 of the first part controls it to move left and right, and the second stepping motor 7-2 connected to the other end of the second slide rail 8-2 controls the second stepping motor 7-2 to move left and right. Moving, the first powder pressing board 9 is connected with the first control system 13 , and the second powder pressing board 10 is connected with the second control system 14 .

The rapid prototyping method of a powder bed additive manufacturing single-layer multi-material surface layer system comprises the following steps:

Step 1: Export the layered slice information of the part to be printed, and identify the information of each layer, including the information of the powder material A to be adsorbed and storing it in the first control system 13, and the information of the powder material B to be adsorbed. into the second control system 14;

Step 2: Place the powder material A to be adsorbed in the first powder supply cylinder 3-1, place the powder material B to be adsorbed in the second powder supply cylinder 3-2, the first powder compaction plate 9 and the second powder compaction Plates 10 give attraction respectively;

Step 3: Through the first control system 13 and the second control system 14, the lower bottom surfaces of the first powder compaction board 9 and the second powder compaction board 10 are respectively provided with the nth layer slice information of the part to be printed, wherein the first powder compaction board 9. The bottom surface of the second compaction plate 10 is formed according to the filling shape of the powder material A to be adsorbed in the nth layer information, and the bottom surface of the second compaction plate 10 is formed according to the filling shape of the powder material B to be adsorbed in the nth layer information. Attraction of areas of equal shape;

Step 4: Use the first slider 11-1 and the first guide rod 12-1 to move the first pressing plate 9 upwards, and then move the first stepping motor 7-1 and the first slide rail 8-1 Press the powder pressing plate 9 to the top of the first powder supply cylinder 3-1, absorb a layer of powder material A to be adsorbed, then move the first powder pressing plate 9 to the forming surface of the forming cylinder 2, compact the powder downwards, disconnect the second the suction force of a powder pressing plate 9, and move the first powder pressing plate 9 to the starting position;

Step 5: Use the second slider 11-2 and the second guide rod 12-2 to move the second pressing plate 10 upwards, and then move the second stepping motor 7-2 and the second slide rail 8-2 Press the powder pressing plate 10 to the top of the second powder supply cylinder 3-2, absorb a layer of powder material B to be adsorbed, then move the second powder pressing plate 10 to the forming surface of the forming cylinder 2, compact the powder downwards, disconnect the first the suction force of the second powder pressing plate 11, and move the second powder pressing plate 10 to the starting position;

Step 6: Use a heat source to lay a compacted layer of powder on the forming surface of the forming cylinder 2 for scanning, melting and forming;

Step 7: The forming cylinder 2 moves downward for a distance of a certain layer thickness, and the first powder supply cylinder 3-1 and the second powder supply cylinder 3-2 move upward for a distance of a layer thickness;

Step 8: Through the first control system 13 and the second control system 14, respectively, the lower bottom surfaces of the first powder compaction plate 9 and the second powder compaction plate 10 have the n+1th layer slicing information of the part to be printed, wherein the first compactor The bottom surface of the powder plate 9 forms an attraction force of the same shape area according to the filling shape of the powder material A to be adsorbed in the n+1th layer information, and the bottom surface of the second powder pressing plate 10 contains the powder to be adsorbed according to the n+1th layer information The filled shape of material B forms an attraction for an area of equal shape;

Step 9: Repeat the above steps 4 to 8, repeating the cycle layer by layer, and finally form the whole part.

The described rapid prototyping method of a powder bed additive manufacturing single-layer multi-material surface layup system is carried out under an inert gas environment or a vacuum environment.

The powder to be adsorbed in the second step is electrostatic powder or magnetic powder.

The way to give the powder-tamping board attractive force in the step 2 is to connect the powder-pressing board to a high-voltage power supply to make the powder-pressing board have an electrostatic attraction, or to make the powder-pressing board magnetic by attaching a magnet to the lower surface of the powder-pressing board attraction.

The present invention has the following beneficial effects:

Because the single-layer multi-material surface layup system of the present invention is not limited by the shape and dimension of the part to be formed, it can quickly form any multi-dimensional and multi-material parts; due to the attractive method, the powder material to be adsorbed is adsorbed on On the powder pressing board, the powder material can be compacted on the surface of the formed part to achieve the effect of increasing the density of the part; due to the fast movement speed of the mobile surface laying system, the moving process is not resisted, and the powder spreading process can be completed quickly. It can realize precise control of powder spreading amount and improve production efficiency.

Description of drawings

Fig. 1 is a schematic structural diagram of the system of the present invention.

detailed description

The present invention will be further described in detail below in conjunction with the accompanying drawings.

Referring to Fig. 1 , a powder bed additive manufacturing single-layer multi-material surface laying system includes a forming worktable 1, a forming cylinder 2 is provided in the middle below the forming worktable 1, and a first forming cylinder 2 is provided on both sides of the forming cylinder 2. The powder supply cylinder 3-1 and the second powder supply cylinder 3-2 are fixedly connected on both sides above the forming table 1 through the connecting plate 4 and the truss mechanism 5 respectively, and a rib plate is also connected between the connecting plate 4 and the truss mechanism 5 6. The truss mechanism 5 is equipped with a first slide rail 8-1 and a second slide rail 8-2, the first slide rail 8-1 and the second slide rail 8-2 are arranged in parallel in the vertical direction, and the first slide rail 8-1 cooperates with the first slider 11-1, the first slider 11-1 is connected with the first guide rod 12-1, and the bottom end of the first guide rod 12-1 is connected with the first pressing powder plate 9; The second slide rail 8-2 cooperates with the second slide block 11-2, the second slide block 11-2 is connected with the second guide rod 12-2, and the bottom end of the second guide rod 12-2 is connected with the second pressing powder plate 10. The slider and the guide rod can move the powder pressing plate up and down, and the first powder pressing plate 9 is controlled by the first stepping motor 7-1 connected to the end of the first slide rail 8-1 to move left and right , the second powder pressing plate 10 is controlled by the second stepper motor 7-2 connected to the other end of the second slide rail 8-2 to move left and right, the first powder pressing plate 9 is connected to the first control system 13 , the second powder pressing plate 10 is connected to the second control system 14, and the control system controls the powder pressing plate to realize the precise powder suction function.

The rapid prototyping method of a powder bed additive manufacturing single-layer multi-material surface layer system comprises the following steps:

Step 1: Export the layered slice information of the part to be printed, and identify the information of each layer, including the information of the powder material A to be adsorbed and storing it in the first control system 13, and the information of the powder material B to be adsorbed. Into the second control system 14, the powder material A to be adsorbed and the powder material B to be adsorbed are both electrostatic powders;

Step 2: Place the powder material A to be adsorbed in the first powder supply cylinder 3-1, place the powder material B to be adsorbed in the second powder supply cylinder 3-2, the first powder compaction plate 9 and the second powder compaction The plates 10 give suction respectively, and the way of giving the suction is to connect the first powder compaction plate 9 and the second powder compaction plate 10 to a high-voltage power supply respectively, and the polarity of the first powder compaction plate 9 is the same as that of the powder material A to be adsorbed. The charged polarity is opposite, the powder material A to be adsorbed can be tightly adsorbed on the lower surface of the first powder pressing plate 9, and the polarity of the second pressing powder plate 10 is the same as that of the charged powder material B to be adsorbed. On the contrary, the powder material B to be adsorbed can be tightly adsorbed on the lower surface of the second pressing powder plate 10;

Step 3: Through the first control system 13 and the second control system 14, the lower bottom surfaces of the first powder compaction board 9 and the second powder compaction board 10 are respectively provided with the nth layer slice information of the part to be printed, wherein the first powder compaction board 10. The lower bottom surface of the second compaction plate 10 is formed according to the filling shape of the powder material A to be adsorbed in the information of the nth layer to form an area of the same shape. Attraction of areas of equal shape;

Step 4: Use the first slider 11-1 and the first guide rod 12-1 to move the first pressing plate 9 upwards, and then move the first stepping motor 7-1 and the first slide rail 8-1 Press the powder pressing plate 9 to the top of the first powder supply cylinder 3-1, absorb a layer of powder material A to be adsorbed, then move the first powder pressing plate 9 to the forming surface of the forming cylinder 2, compact the powder downwards, disconnect the second the suction force of a powder pressing plate 9, and move the first powder pressing plate 9 to the starting position;

Step 5: Use the second slider 11-2 and the second guide rod 12-2 to move the second pressing plate 10 upwards, and then move the second stepping motor 7-2 and the second slide rail 8-2 Press the powder pressing plate 10 to the top of the second powder supply cylinder 3-2, absorb a layer of powder material B to be adsorbed, then move the second powder pressing plate 10 to the forming surface of the forming cylinder 2, compact the powder downwards, disconnect the first the suction force of the second powder pressing plate 10, and move the second powder pressing plate 10 to the starting position;

Step 6: Use a heat source to lay a compacted layer of powder on the forming surface of the forming cylinder 2 for scanning, melting and forming;

Step 7: The forming cylinder 2 moves downward for a distance of a certain layer thickness, and the first powder supply cylinder 3-1 and the second powder supply cylinder 3-2 move upward for a distance of a layer thickness;

Step 8: Through the first control system 13 and the second control system 14, respectively, the lower bottom surfaces of the first powder compaction plate 9 and the second powder compaction plate 10 have the n+1th layer slicing information of the part to be printed, wherein the first compactor The bottom surface of the powder plate 9 forms an attraction force of the same shape area according to the filling shape of the powder material A to be adsorbed in the n+1th layer information, and the bottom surface of the second powder pressing plate 10 contains the powder to be adsorbed according to the n+1th layer information The filled shape of material B forms an attraction for an area of equal shape;

Step 9: Repeat the above steps 4 to 8, repeating the cycle layer by layer, and finally form the whole part.

Claims (5)

1. A single-layer multi-material surface laying system for powder bed additive manufacturing, comprising a forming worktable (1), characterized in that: a forming cylinder (2) is provided in the middle of the lower part of the forming worktable (1), and the forming cylinder The first powder supply cylinder (3-1) and the second powder supply cylinder (3-2) are arranged on both sides of (2), and the two sides above the forming worktable (1) pass through the connecting plate (4) and the truss mechanism ( 5) Fixed connection, the truss mechanism (5) is equipped with a first slide rail (8-1) and a second slide rail (8-2), the first slide rail (8-1) and the second slide rail (8- 2) Arranged in parallel in the vertical direction, the first slide rail (8-1) cooperates with the first slider (11-1), and the first guide rod (12-1) is connected to the first slider (11-1) ), the bottom end of the first guide rod (12-1) is connected with the first powder pressing plate (9); the second slide rail (8-2) cooperates with the second slide block (11-2), and the second slide block ( 11-2) is connected with the second guide rod (12-2), the bottom end of the second guide rod (12-2) is connected with the second pressing powder plate (10), and the first pressing powder plate (9) is connected by The first stepper motor (7-1) at the end of one side of the first slide rail (8-1) controls it to move left and right, and the second powder pressing plate (10) is connected to the second slide rail (8-2) The second stepper motor (7-2) at the end of the other side controls it to move left and right, the first powder pressing plate (9) is connected with the first control system (13), the second pressing powder plate (10) and the second pressing powder plate (10) Two control systems (14) are connected. 2. The rapid prototyping method of a powder bed additive manufacturing single-layer multi-material surface layer system according to claim 1, characterized in that, comprising the following steps: Step 1: Export the layered slice information of the part to be printed, and identify the information of each layer, including the information of the powder material A to be adsorbed and storing it in the first control system (13), including the information of the powder material B to be adsorbed The information is stored in the second control system (14); Step 2: Place the powder material A to be adsorbed in the first powder supply cylinder (3-1), place the powder material B to be adsorbed in the second powder supply cylinder (3-2), and place the first powder pressing plate (9 ) and the second powder pressing plate (10) give attraction respectively; Step 3: Through the first control system (13) and the second control system (14), respectively make the lower bottom surfaces of the first powder pressing plate (9) and the second pressing powder plate (10) have the nth slice of the part to be printed Information, wherein the bottom surface of the first powder pressing plate (9) forms the attraction of the same shape area according to the filling shape of the powder material A to be adsorbed in the nth layer information, and the bottom surface of the second powder pressing plate (10) according to the nth layer The information contains the attraction of the filled shape of the powder material B to be adsorbed to form an area of equal shape; Step 4: Use the first slider (11-1) and the first guide rod (12-1) to move the first pressing plate (9) upwards, and then pass the first stepping motor (7-1) and the first The slide rail (8-1) moves the first powder pressing plate (9) to the top of the first powder supply cylinder (3-1), absorbs a layer of powder material A to be adsorbed, and then moves the first powder pressing plate (9) to the top of the first powder supply cylinder (3-1). The forming surface of the forming cylinder (2) compacts the powder downwards, disconnects the suction force of the first powder pressing plate (9), and moves the first powder pressing plate (9) to the starting position; Step 5: Use the second slider (11-2) and the second guide rod (12-2) to move the second pressing plate (10) upwards, and then pass the second stepping motor (7-2) and the second The slide rail (8-2) moves the second powder pressing plate (10) to the top of the second powder supply cylinder (3-2), absorbs a layer of powder material B to be adsorbed, and then moves the second powder pressing plate (10) to the top of the second powder supply cylinder (3-2). The forming surface of the forming cylinder (2) compacts the powder downwards, disconnects the suction force of the second powder pressing plate (11), and moves the second powder pressing plate (10) to the starting position; Step 6: Using a heat source to lay a layer of compacted powder on the forming surface of the forming cylinder (2) for scanning, melting and forming; Step 7: The forming cylinder (2) moves downward for a distance of a certain layer thickness, and the first powder supply cylinder (3-1) and the second powder supply cylinder (3-2) move upward for a distance of a layer thickness; Step 8: Through the first control system (13) and the second control system (14), respectively make the lower bottom surface of the first powder pressing plate (9) and the second pressing powder plate (10) bear the n+1th part of the part to be printed Layer slicing information, wherein the bottom surface of the first powder pressing plate (9) forms the attraction of the same shape area according to the filling shape of the powder material A to be adsorbed in the n+1th layer information, and the bottom surface of the second powder pressing plate (10) According to the filling shape of the powder material B to be adsorbed in the n+1th layer information, the attraction force of the same shape area is formed; Step 9: Repeat the above steps 4 to 8, repeating the cycle layer by layer, and finally form the whole part. 3. The rapid prototyping method of a powder bed additive manufacturing single-layer multi-material surface layer system according to claim 2, characterized in that: the powder bed additive manufacturing single-layer multi-material surface The rapid prototyping method of the laminated system is carried out under an inert gas environment or a vacuum environment. 4. A rapid prototyping method for powder bed additive manufacturing of a single-layer multi-material surface layer system according to claim 2, characterized in that: the powder to be adsorbed in the second step is an electrostatic powder or a magnetic powder powder. 5. A rapid prototyping method for powder bed additive manufacturing of a single-layer multi-material surface layup system according to claim 2, characterized in that: the way of giving the powder press attractive force in the second step is through The powder pressing board is connected with a high-voltage power supply to make the powder pressing board have an electrostatic attraction, or attach a magnet to the lower surface of the powder pressing board to make the powder pressing board have a magnetic attraction.