CN103447528B - The Foldable and easy be shaped for selective laser fusing changes building mortion - Google Patents

Abstract

The invention discloses a kind of Foldable and easy replacing building mortion be shaped for selective laser fusing, it is characterized in that, comprise forming board, base plate, from the bottom up diminishing telescopic cover, forming board is fixed on base plate, telescopic cover lower end is fixed on floor peripheral, and base plate is connected with electric pushrod upper plate by lower clamping element; Telescopic cover upper end is connected with the lower surface of forming face by upper clamping element.After forming process terminates, this device need only be taken out and part can be taken out and remove residual powder.

Description

Foldable and easily replaceable forming device for laser selective melting forming

technical field

The invention relates to a 3D printing laser selective melting rapid prototyping technology, in particular to a metal and nonmetal laser selective melting forming device.

Background technique

Selective Laser Melting (SLM) technology is a rapid prototyping technology that can directly form metal parts, and it is one of the main forms of rapid prototyping in 3D printing. The principle of this technology is shown in Figure 1. The industrial computer controls the vibrating mirror to scan the selected area according to the sliced CAD model information, and the scanned metal powder is melted and bonded together. After one layer is scanned, the feeding cylinder is raised by one layer (the forming cylinder is correspondingly lowered by one layer), and the scraper (or rollers) spread a layer of powder on the forming surface, and then scan and melt the next layer, so that the final part is formed layer by layer. Since each layer of unmelted powder supports the inclined (or even suspended) parts, complex metal parts that cannot be manufactured by traditional processing methods can be directly manufactured, and the formed parts have good mechanical properties. Because of this, This process is more and more widely used in aerospace and biomedicine.

Because the SLM process uses a scanning galvanometer to control the laser scanning path, the speed can reach 3-5m/s, so its forming efficiency is relatively high, but it takes a long time to clean up the remaining powder after the part is formed, because the forming process In the process, there will be more or less metal powder remaining on the forming surface, and in the forming cylinder except for the formed parts, other spaces are filled with unmelted metal powder. It is not easy to clean up these powders with a particle size of only a few tens of microns. If you use a vacuum cleaner to suck it, it is time-consuming and laborious, and because the sucked powder is metal, it is easy to damage the motor of the vacuum cleaner; Manual cleaning with a powder cleaning brush, the fine powder will form dust when it moves, which seriously damages the health of the operator, is not conducive to the long-term use of the equipment, consumes a lot of auxiliary time, and does not meet the high efficiency, environmental protection and human nature of modern industry concept. How to solve the cleaning and recovery of laser selective melting powder well also determines the promotion of SLM equipment technology in the market and large-scale industrial application in a sense.

At present, foreign SLM equipment such as EOSINT M280 from EOS in Germany and FS-Realizer ^SLM Machine from MCP in the UK all use special explosion-proof vacuum cleaners to recover the remaining powder after forming. This special vacuum cleaner has no similar products in China.

In actual production, if there is a better way to recover the formed powder and save the vacuum cleaner, it will definitely improve the overall efficiency of the equipment and be more conducive to the health of the staff, thereby improving the competitive advantage of the equipment. In the long run, it will also It can better promote the further development and application of laser selective melting technology.

Contents of the invention

In order to solve the problems of time-consuming, labor-intensive and poor effect of powder recovery in existing SLM equipment, the purpose of the present invention is to provide a forming device for laser selective melting Telescopic, so that it is more convenient to recycle and remove the remaining powder.

In order to achieve the above object, the present invention is achieved by taking the following technical solutions:

A foldable and easy-to-change forming device for laser selective melting and forming, which is characterized in that it includes a forming substrate, a bottom plate, and a telescopic cover that gradually shrinks from bottom to top, the forming substrate is fixed on the bottom plate, and the lower end of the telescopic cover is fixed on the periphery of the bottom plate , the bottom plate is connected with the upper plate of the electric push rod through the lower clamping piece; the upper end of the telescopic cover is connected with the lower surface of the forming surface through the upper clamping piece.

In the above solution, the telescopic cover includes a plurality of rings nested together, the upper end of the radially innermost ring is connected to the lower surface of the forming surface; the lower end of the radially outermost ring is fixed on the periphery of the bottom plate, and each ring extends axially. The long back is connected by the opposite "L" perimeter.

The total axial height of the bottom plate and the forming base plate is not higher than the total height of the telescoping cover in a compressed state.

Compared with the traditional method (the powder in the forming process falls directly into the forming cylinder), the advantages of the present invention are:

1. The remaining powder during the forming process falls into the foldable and replaceable powder forming device, and gradually stretches as the bottom plate descends, and each layer of metal powder will fall into the telescopic cover. After forming, just take out the device to recover the powder, which is very convenient to operate

2. Since there is no powder remaining on the forming surface, and the remaining powder of each layer is in the telescopic cover, after the forming is completed, no additional equipment is needed to clean up the remaining powder in the equipment, which saves manual cleaning operations The process greatly improves the working environment of the staff.

3. The time for powder cleaning and powder recovery is greatly shortened, the overall forming efficiency of the equipment is improved, and the competitiveness of the equipment in the market is improved.

The invention is applicable to the field of 3D printing rapid prototyping, and aims to solve the problem of inconvenient recovery and cleaning of forming powder existing on laser selective melting equipment. It saves the powder cleaning time and improves the utilization rate of the forming machine.

Description of drawings

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

Figure 1 is a schematic diagram of the principle of laser selective melting equipment.

Fig. 2 is a schematic structural view of the device of the present invention. In the figure: 1. Forming base surface, 2. Pressing part, 3. Cylinder body, 4. Telescoping cover, 5. Base plate, 6. Pressing part, 7. Forming base plate, 8. Electric push rod.

Fig. 3 is a schematic diagram of the compression state of the forming device of Fig. 2 .

Fig. 4 is an enlarged schematic view of the connecting portion of the retractable cover. Among them: a is the enlarged view of part I in Fig. 2; b is the enlarged view of part II in Fig. 3.

Detailed ways

As shown in Figure 2, a foldable and easy-to-change forming device for laser selective melting and forming is set in the cylinder body 3 of the original forming cylinder, including a forming base plate 7, a bottom plate 5, and a telescopic cover 4 that gradually shrinks from bottom to top . The forming substrate 7 is fixed on the base plate 5 , the lower end of the telescoping cover 4 is fixed on the periphery of the base plate 5 , and the base plate 5 is connected to the upper plate of the electric push rod 8 through the clamping member 6 . The upper end of the telescopic cover 4 is connected to the lower surface of the forming surface 1 (connected with the upper end of the former forming cylinder) through the clamping part 2 .

At the beginning of forming, the electric push rod 8 pushes the bottom plate 5 and the forming base plate 7 up, so that the forming base plate and the forming surface 1 are flush. The shape in the figure is only for illustration, and the actual application is not limited to the material and structure, as long as the expansion and contraction effect and sufficient rigidity can be ensured (so as not to collapse and cause the powder to overflow when taken out), the total height of the base plate 5 and the forming base plate 7 It should not be higher than the total height of the telescoping cover 4 in a compressed state. During the forming process, the forming device gradually extends as the bottom plate descends, and each layer of metal powder will fall into the device. After forming, the shape changes as shown in Figure 2, loosen the clamping devices 2 and 6, take out the forming device, clean out the metal powder in it, and take out the formed parts.

Figure 4 shows a specific structure of the telescoping cover 4, including a plurality of (at least three) nested rings (Fig. 4b) whose height is greater than the total height of the bottom plate and the forming base plate, and the upper end of the radially innermost ring is connected and formed The lower surface of surface 1; the lower end of the radially outermost ring is fixed on the periphery of the bottom plate 5, and the diameter of each ring increases in turn, and each ring is connected by the opposite "L" periphery after being axially elongated (Fig. 4a). The "L" periphery of the inner ring slides along the inner wall of the "L" periphery of the outer ring, which can effectively prevent the powder from flowing out.

Claims (3)

1. the Foldable and easy replacing building mortion be shaped for selective laser fusing, it is characterized in that, comprise forming board, base plate, from the bottom up diminishing telescopic cover, forming board is fixed on base plate, telescopic cover lower end is fixed on floor peripheral, and base plate is connected with electric pushrod upper plate by lower clamping element; Telescopic cover upper end is connected with the lower surface of forming face by upper clamping element.

2. the Foldable and easy be shaped for selective laser fusing as claimed in claim 1 changes building mortion, and it is characterized in that, described telescopic cover comprises multiple ring be nested together, joint forming face, radial direction interior side loop upper end lower surface; Radially side loop lower end is fixed on floor peripheral, and each ring diameter increases successively, and connected by contrary " L " shape periphery after each ring axial elongation, under interior side loop, " L " periphery slides along the inwall of " L " periphery on the ring of outside.

3. the Foldable and easy be shaped for selective laser fusing as claimed in claim 2 changes building mortion, and it is characterized in that, the axial total height of described base plate and forming board is not higher than telescopic cover total height in the compressible state.