TWI667123B - Improved intake structure for laminated manufacturing - Google Patents

Abstract

The present invention provides an improved intake structure for laminated manufacturing, which is a structure improvement of a nozzle for laminated manufacturing, through which a gas generating device is connected, and a gas guide generated by the gas generating device Leading into the processing chamber, the inlet structure comprises a conversion unit connected to the gas generating device, a flow guiding unit connected to the conversion unit for guiding the gas into the gas, connecting the guiding unit and adjusting the a rectifying unit that enters a gas flow rate, and a cavity intake unit that guides the gas into the processing chamber, wherein a plurality of commutator segments are disposed in the rectifying unit, and the position, the spacing and the number of the plurality of commutator segments are set to control the flow resistance The method achieves the purpose of controlling the uniform flow velocity distribution of the gas cross-section into the processing chamber.

Description

Improved intake structure for laminated manufacturing

The present invention relates to an improvement in the structure of the intake port, and more particularly to an improvement in the structure of the intake port for laminate manufacturing.

Additive Manufacturing (AM) or Three-Dimensional Printing is a technology that is currently being developed in various countries. It has spared no effort in this advanced country to change the current manufacturing environment and strengthen its international competitiveness. In the current laminated manufacturing technology, mainly based on laser laminate manufacturing technology, the technology uses laser as the energy source, through the laser melting principle, the three-dimensional model is divided into two-dimensional geometric shapes, paved The powder layer, which is then passed through the laser beam to provide the required energy, melt-forms the powder layer on the two-dimensional geometry, and uses a gradual stacking method to achieve a complex structure that cannot be fabricated by conventional processing.

Referring to FIG. 1 , it is a schematic diagram of a conventional intake port structure for laminated manufacturing. As shown in the figure, the structure includes a panel 1 on which a plurality of through holes 11 are disposed, and the through holes 11 are provided. The central through hole 111 and the edge through hole 112 are respectively disposed, and the hole diameter of the central through hole 111 is respectively set to be smaller than the edge through hole 112, so that the gas entering the cavity is evenly distributed. However, the setting manner is that the gas enters into the air. In the airway, a spoiler is generated in the air inlet, and the middle The aperture of the central through hole 111 is small, so the gas entering the intake passage is hindered, and the recirculation occurs, so that the gas entering the cavity is blocked by the backflow and the aperture of the central through hole 111, and cannot be designed as expected. Uniform access to the cavity.

However, at present, the laser laminate manufacturing technology faces problems such as poor production efficiency, unstable workpiece quality, limited metal materials, and expensive materials and equipment. Among them, the quality of the work is unstable due to the laminated manufacturing. When the slag and oxide are not effectively removed, the impurities in the working chamber are too high, which in turn affects the processing zone where the melt is not formed, and the impurities and oxides in the finished product occur.

Based on the above, there is an urgent need for a laminate manufacturing technology that can keep the processing area clean and avoid welding slag and oxide contamination of the processing area, thereby improving the quality and stability of the laminated manufacturing.

In view of the above disadvantages of the prior art, the main object of the present invention is to provide an improvement of the intake port structure for laminated manufacturing, by changing the position, spacing and quantity of the plurality of commutator segments, and controlling the flow into the machining chamber by flow resistance control. The purpose of the uniform velocity distribution of the cross-sectional flow velocity of the body gas.

Another object of the present invention is to provide an improved intake port structure for laminated manufacturing, which can achieve the purpose of controlling the cross-sectional gas flow of the intake structure by changing the position, spacing and number of the cross-section of the rectifying unit in the cross section of the rectifying unit. .

In order to achieve the above object, the present invention provides a method for laminated manufacturing The improvement of the inlet structure is an improvement of the inlet structure for the processing chamber of the laminated manufacturing equipment, through which a gas generating device is connected, and the gas generated by the gas generating device is guided into The processing chamber includes a conversion unit connected to the gas generating device, a flow guiding unit connected to the conversion unit for guiding the gas into the gas, a connecting the guiding unit and adjusting the inlet gas a rectifying unit of the flow rate, and a cavity intake unit for guiding the gas passing through the rectifying unit to the cavity of the processing chamber, wherein the rectifying unit is provided with a plurality of commutator segments, and the position and spacing of the plurality of commutator segments are set And the quantity, the flow resistance control method is used to achieve the purpose of controlling the uniform flow velocity distribution of the gas cross-section into the processing chamber.

1‧‧‧ panel

11‧‧‧through hole

111‧‧‧Medium hole through hole

112‧‧‧Edge through hole

2‧‧‧ Intake structure

21‧‧‧Conversion unit

22‧‧‧Guide unit

23‧‧‧Rectifier unit

24‧‧‧Air intake unit

231‧‧‧Rectifier

Figure 1 is a schematic view of a conventional intake port structure.

Figure 2 is a schematic view showing the structure of the intake port of the present invention.

Figure 3 is a schematic diagram of the flow field of a conventional 4-division air intake structure.

Figure 4 is a schematic view showing the structure of the commutator piece of the present invention.

Figure 5 is a schematic view of a first embodiment of the present invention.

Figure 6 is a schematic view of the flow field of the first embodiment of the present invention.

The embodiments of the present invention are described below by way of specific examples, and those skilled in the art can understand the other advantages and advantages of the present invention from the disclosure.

Please refer to FIG. 2 , which is a schematic view of the structure of the inlet passage of the present invention. As shown in the figure, it is an improvement of the inlet structure for the processing chamber of the laminated manufacturing equipment, and a gas is connected through the inlet structure 2 . Generating a device (not shown), and guiding the gas generated by the gas generating device into the processing chamber, the inlet structure 2 includes a conversion unit 21 connected to the gas generating device, and connecting the conversion The unit 21 is configured to guide the flow guiding unit 22 into the gas, a rectifying unit 23 connecting the guiding unit 22 and adjusting the flow rate of the incoming gas, and a unit for guiding the gas passing through the rectifying unit 23 into the processing chamber. The air intake unit 24 is characterized in that: the rectifying unit 23 is provided with a plurality of rectifying pieces 231, and the position, the spacing and the number of the plurality of rectifying pieces 231 are set, and the flow resistance control mode is used to control. Enter the purpose of the uniform flow velocity distribution of the cross-section flow velocity of the gas in the processing chamber.

Please refer to Fig. 3, which is a schematic diagram of the flow field of the conventional 4-divle inlet structure, and the flow field analysis of the 4-division diversion structure (Fig. 3a), in order to ensure the flow field of the height at the height of the setting mode. In the case of the situation, each height change and flow field condition test (shown in Figures 3b to 3d) is performed on the basis of the processing platform. As disclosed in the above figure, the conventional 4 is provided with the inlet structure at a test height of 5 mm. At the inlet of the inlet (Fig. 3b), a significant disturbance of the airflow is generated. When the test height is raised to 10 mm (Fig. 3c), the disturbance of the intermediate gas flow is reduced, but disturbances are generated on both sides of the inlet. The condition increases. When the test height is adjusted to 15mm (Fig. 3d), the disturbance phenomenon at the entrance disappears, the disturbance phenomenon on both sides of the inlet is reduced, but the gas disturbance cannot be eliminated, so in the production of the base layer, Easy to cause product Uneven material or distribution, which in turn affects the accuracy of laminate manufacturing

Referring to FIG. 4, it is a schematic structural view of the rectifier sheet of the present invention. As shown in the figure, after the conversion unit 21 introduces external air into the inlet structure, the flow guiding unit 22 subdivides the incoming gas into a plurality of smaller pieces. The flow of the fluid is provided at the rectifying unit 23 with a plurality of commutator segments 231. The position, the spacing and the number of the plurality of commutator segments 231 are set, and the flow velocity and flow uniformity of the gas flow field are controlled by the flow resistance control method, and then the gas is permeated. The air intake unit 24 is transmitted to the processing chamber (not shown). Referring to FIG. 5, it is a schematic diagram of the first embodiment of the present invention. As shown in the figure, the height h and the length L of the fairing 231 are adjusted. Each of the segments 231 is provided with a spacing b, so that the gas entering the inlet structure 2 enters along the conversion unit 21, and then passes through the flow guiding unit 22 to divert the incoming gas into the rectifying unit. The inventor of the present invention The uniformity of the incoming gas is increased, so that the rectifying piece 231 in the rectifying unit 23 is adjusted, and the height, length and distribution of the rectifying piece are adjusted, so that the airflow at each of the different positions is subjected to different resistance effects. Forming a uniform gas into the cavity, wherein the present invention calculates the uniformity analysis parameter Uniformity of the intake structure 2 by using the velocity of the test sampling zone As the design basis of the intake structure 2, the more the obtained value becomes closer to 1, through the simulation result, the more uniform the flow rate is obtained, and it is proposed in the specification that the pitch of the fairing 231 is set at a pitch of 0.05 to 0.2 times. Set the optimal setting range.

Please refer to FIG. 6 , which is a schematic diagram of a flow field according to a first embodiment of the present invention, which is disclosed by the above figure. In this case, the air intake unit 24 exits 100 mm to 500 mm. The height of 20mm is used as the test sampling area to collect the sampling point velocity data. As shown in the figure, another 4 partition structure is added to the common 4-cell diversion structure (as shown in Fig. 6a), and the rectification is set in the honeycomb division mode. For the measurement of the flow field condition in the flow channel, in order to ensure the flow field state of the height of the installation mode, the height change and the flow field condition test are respectively performed based on the processing platform (Fig. 6b~6d) Show), at the test height of 5mm (Fig. 6b), as shown in the inlet of the inlet, the resulting airflow disturbance is more obvious on both sides of the centerline. When the test height is 10mm (Fig. 6c), the entrance The gas disturbance condition generated by the space is obvious when it is 5 mm, but when the test height is adjusted to 15 mm (Fig. 6d), the disturbance at the entrance disappears.

The above-described embodiments are merely illustrative of the features and functions of the present invention, and are not intended to limit the scope of the technical scope of the present invention. Modifications and variations of the above-described embodiments can be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, the scope of protection of the present invention should be as set forth in the scope of the claims described below.

Claims (5)

An improved intake port structure for laminated manufacturing, which is an improvement of an inlet structure for a processing chamber of a laminated manufacturing apparatus, through which a gas generating device is connected and generated by the gas generating device The gas is guided into the processing chamber, the inlet structure includes a conversion unit connected to the gas generating device, a flow guiding unit connected to the conversion unit for guiding the gas into the gas, and a connecting flow guiding unit And adjusting a rectifying unit for entering the gas flow rate, and a cavity intake unit for guiding the gas passing through the rectifying unit to the cavity in the processing cavity, wherein the main structure of the inlet channel is characterized in that: the rectifying unit is provided with a plurality of The commutator piece is expanded outward from the center of the cross section of the rectifying unit, arranged in an equidistant spacing manner, and the position, the spacing and the number of the plurality of rectifying sheets are arranged, so that the fluids at different positions are subjected to different resistance effects to flow The way of controlling the amount of intake air reaches the purpose of controlling the gas flow in the cross section of the intake structure. The improvement of the intake port structure for laminated manufacturing according to claim 1, wherein the number of the fins is set inversely proportional to the magnitude of the gas flow rate. The improvement of the intake port structure for laminated manufacturing according to the first aspect of the patent application, wherein the arrangement distance of the commutator pieces is 0.05 to 0.2 times the length of the commutator piece. The improvement of the intake port structure for laminated manufacturing according to the first aspect of the invention, wherein the set-up pitch of the commutator is arranged in an equidistant manner from the center of the cross-section of the rectifying unit. The improvement of the intake port structure for laminated manufacturing according to claim 1, wherein the cross section of the inlet structure is one of a circular shape, a rectangular shape, a triangular shape and a polygonal shape.