CN107042308A - A kind of antifouling powder device for powdering formula constituency fusion apparatus moulding cylinder - Google Patents

Abstract

The invention discloses an anti-clogging powder device for a forming cylinder of a powder-spreading type selective melting equipment, and particularly relates to a buckle design scheme for connecting four thin plates, the main purpose of which is to drive a rectangular ring when the forming substrate descends The four thin plates on the four sides move downwards, and the two adjacent thin plates are connected vertically through the buckles on the four corners of the rectangular ring, and cooperate with the rectangular thin plates at the bottom to form a cuboid forming chamber, so that the formed substrate, formed parts and powder are all placed in it. Compared with the existing forming chamber mechanism, this mechanism separates the forming substrate from the four walls of the forming cylinder through four thin plates, and places the forming substrate and metal powder in a closed groove composed of four thin plates and the bottom thin plate, so that While ensuring that the molding substrate can move downward, the molding substrate and the powder are separated from the four walls of the molding chamber, so as to avoid the powder piled up between the molding substrate and the four walls of the molding chamber, and then powder plugging occurs.

Description

An anti-clogging powder device for forming cylinders of powder-spreading selective melting equipment

technical field

The present invention belongs to the invention of the anti-clogging powder method for the forming cylinder of the powder-spreading type selective melting equipment, and particularly relates to a design for connecting four thin plates through buckles, which is expected to be used for the anti-clogging powder of the forming cylinder in the powder-spreading type selective melting equipment

Background technique

The powder-spreading selective laser melting technology is a typical metal 3D printing technology. Its basic principle is that the powder-spreading device evenly spreads the metal powder on the molding substrate, and then the laser (or electron beam) is controlled by the vibrating mirror system to The laid powder layer is selectively scanned and melted. Then the substrate is lowered by one layer thickness, and the powder spreading device performs powder spreading. The above steps are repeated continuously, layer by layer, and finally the processing of metal parts is completed. Compared with traditional parts processing technology, selective fusion molding technology can realize the full utilization of materials and can manufacture parts with very complex shapes. At present, this technology has been widely used in aerospace, medical and other fields, and has very good development prospects.

In selective fusion molding equipment, every time the laser (or electron beam) scans a layer of powder, the molding substrate will drop one layer. During the descending process of the molding substrate, the powder on the substrate will accumulate in the gap between the substrate and the inner wall of the molding cylinder. middle. The commonly used solution at present is to improve the dimensional accuracy of the base plate and the inner wall of the molding chamber and install a rubber ring for sealing. However, since the powder particles are very small, the particles are still inevitably accumulated in the gaps. Aiming at the problem that the forming substrate of the selective melting molding equipment is easy to be powder-filled, the present invention specially designs a device that can prevent powder-plugging.

Contents of the invention

The main purpose of the present invention is to solve the problem of forming cylinder plugging powder in selective melting equipment, and specially designed an anti-clogging powder device, which can be installed on the forming cylinder already in use, or can be combined with the forming cylinder Prepare a new molding cylinder to realize the separation of the molding substrate and the molding cylinder wall, thereby avoiding the effect of powder plugging.

The plug-free powder structure for the powder-spreading 3D printer molding cylinder is characterized in that it includes a rectangular fixing ring, a rectangular baffle, and a rectangular fixing ring in a back-shaped structure, and the rectangular fixing ring includes buckles for powder blocking and connections. Buckle; the four corners of the rectangular fixing ring are buckles for connection; the buckle for connection is a right-angle structure, and the inside is two arc-shaped channels perpendicular to each other, and its function is to make the two rectangular baffles pass through The two arc-shaped channels are then glued to each other; between the two buckles for connection on the four sides of the back-shaped baffle is a buckle for blocking powder, and its function is to prevent the powder from flowing out from the edge; There is an arc channel inside the buckle;

One side of the rectangular baffle is glued with a rectangular rubber strip, and the side of the rubber strip perpendicular to the rectangular thin baffle is pasted with a Velcro sticker, and the other side of the rectangular baffle is glued with a Velcro mother sticker at a place symmetrical to the rectangular rubber strip ;The lower end of the rectangular baffle is connected with the rubber bottom plate;

The shape of the metal bottom plate is square, and the area is the same as the bottom area of the cube surrounded by the four rectangular baffles;

In the initial state, the metal bottom plate is at the highest point, which is in contact with the back-shaped structure; the rectangular baffle is connected to the four sides of the metal bottom plate through buckles; during use, the metal bottom plate gradually descends, and the four rectangular baffles follow The movement is gradually connected together by buckles; the rectangular baffle is made of elastic material, which can be folded in the arc-shaped channel of the buckle for powder blocking and the buckle for connection.

Compared with the existing anti-clogging powder device and technology, the device separates the molding substrate from the molding cylinder wall through thin sheets, fundamentally avoiding the problem of powder plugging.

Description of drawings

Figure 1: Schematic diagram of the overall structure 1: Buckle for connection; 2: Rectangular baffle; 5: Buckle for powder blocking

Figure 2: Internal detail view, 3: Sealing strip for connection; 4: Formed substrate.

Figure 3: Schematic diagram of the corners and edges of the sheet-connected plate.

Fig. 4: Foil with sealing strip and formed base plate, :6: One end of attached formed plate

detailed description

The technical scheme adopted by the anti-clogging powder device designed by the present invention is:

(1) The whole device consists of three parts, including thin-sheet connecting plate, thin-sheet and forming substrate.

(2) The overall shape of the sheet connection plate is a back-shaped structure, the connection plate has a certain thickness, and the inside of the four sides is a 180° annular channel, the thickness of the channel is equal to the thickness of the sheet, and the outlet and inlet are at the lower end of the connection plate . Flakes enter from the inlet and come out from the outlet after rotating 180°. This end coming out from the outlet is connected with the four sides of the base plate; the internal structure of the four corners of the sheet connection plate is mutually perpendicular passages, that is, the annular passages on the adjacent two sides are perpendicular to each other here, so that the adjacent two The two sheets can be connected together when they pass through the annular channel.

(3) The function of the sheet is to separate the molding substrate from the molding cylinder wall to prevent powder plugging. The lower end of the sheet is connected to the molding substrate, and a rectangular sealing strip is pasted on one side of the sheet to increase the thickness of the side of the sheet to facilitate connection with adjacent sheets.

(4) The molding substrate is an inverted T-shaped metal plate, and the molding process will be carried out on the substrate. There are two main functions of its shape design: 1. It is to match the shape of the sheet connecting plate; 2. During the molding process, as the base plate descends, the space at the lower part of the connecting plate is greater than the amount of powder applied each time. , Therefore, in each drop of the substrate, the powder layer will drop to a certain height relative to the formed part, so that the powder of the previous layer will not interfere with the new powder when the next powder is spread.

Stick the sealing strip for connection in Figure 2 on one end of the sheet, stick double-sided tape on the side of the sealing strip, make four identical sheets in turn, and then pass through the connecting plate along the entrance of the connecting plate. Connect the end that goes through the connecting plate to the four sides of the molding base.

Raise the lifting platform that controls the lifting of the forming substrate to the highest point, and then connect the connecting plate to the top of the forming cylinder, so that the upper plane of the connecting plate and the forming plane are kept in balance; connect the forming substrate and the lifting platform.

After the above parts are fixed, the molding process can be carried out.

Claims (1)

1. The plug-free powder structure for the powder-spreading 3D printer molding cylinder is characterized in that it includes a rectangular fixing ring, a rectangular baffle, and a rectangular fixing ring in a back-shaped structure, and the rectangular fixing ring includes buckles and connections for powder blocking The buckles used; the four corners of the rectangular fixing ring are used to connect the buckles; the buckles used for the connection are right-angled structures, and the interior is two arc-shaped channels perpendicular to each other, and its function is to make the two rectangular baffles After passing through two arc-shaped passages, they stick to each other; between the two connecting buckles on the four sides of the back-shaped baffle is a buckle for blocking powder, and its function is to prevent the powder from flowing out from the edge; There is an arc channel inside the buckle; One side of the rectangular baffle is glued with a rectangular rubber strip, and the side of the rubber strip perpendicular to the rectangular thin baffle is pasted with a Velcro sticker, and the other side of the rectangular baffle is glued with a Velcro mother sticker at a place symmetrical to the rectangular rubber strip ;The lower end of the rectangular baffle is connected with the rubber bottom plate; The shape of the metal bottom plate is square, and the area is the same as the bottom area of the cube surrounded by the four rectangular baffles; In the initial state, the metal bottom plate is at the highest point, which is in contact with the back-shaped structure; the rectangular baffle is connected to the four sides of the metal bottom plate through buckles; during use, the metal bottom plate gradually descends, and the four rectangular baffles follow The movement is gradually connected together by buckles; the rectangular baffle is made of elastic material, which can be folded in the arc-shaped channel of the buckle for powder blocking and the buckle for connection.