Additive manufacturing sprayer for fiber reinforced composite material based on ultrasonic enhancing

[0030] Specific embodiment one:

[0031] Combine below figure 1 , 2 3. Description of this embodiment. The present invention belongs to the field of additive manufacturing. More specifically, it relates to a nozzle based on an ultrasonic-enhanced fiber-reinforced composite material additive manufacturing, including a nozzle 1, an inner cavity 2, a heat conducting block 3, and a cap 4. , Fiber sprinkler 5, fiber throat 6, Teflon tube Ⅰ 7, resin nozzle 8, resin throat 9, Teflon tube Ⅱ 10, heating rod 13, temperature sensor 14 and ultrasonic generator 16, can improve the resin and fiber The bonding effect prevents the head from clogging and is easy to clean the nozzle.

[0032] The spray head 1 is detachably connected to the lower end of the inner cavity 2, the heat conducting block 3 is sleeved on the spray head 1, a heating rod 13 and a temperature sensor 14 are nested on the heat conducting block 3, and the upper end of the inner cavity 2 is detachable Connected with cap 4. The detachable connection can be a threaded connection or an interference fit, etc. The purpose is to divide the nozzle into multiple parts for manufacturing. In the event of a wire jam, the parts can be quickly disassembled to facilitate cleaning and dredging of the print head.

[0033] The cap 4 is provided with a through hole for connecting the fiber throat 6 and the resin throat 9. The fiber throat 6 and the resin throat 9 can be detachably connected to the through hole of the cap 4, and the resin throat 9 is connected to the through hole. The resin nozzle 8 can also be detachably connected to the through hole. The through hole used to connect the fiber throat 6 and the resin throat 9 can be a threaded hole to achieve a threaded connection, or it can be a cylindrical hole corresponding to the outer diameter of the fiber throat 6 and the resin throat 9 to achieve an interference fit Connection, both ways can realize detachable connection. In addition, it is better to have multiple through holes, so that multiple strands of resin 12 of the same material or different materials can be fed simultaneously. And the through holes should be evenly distributed around the fiber throat pipe 6, so that the fiber throat pipe 6 has an even amount of resin to enter in all directions, and prevents the resin from entering the fiber throat pipe 6 from unevenly, so that the fiber in the fiber throat pipe 6 cannot be guaranteed. 11 cannot be in the center position. When the resin wrapped around the fiber 11 is the most uniform, that is, when the fiber 11 is in the middle of the resin, the printing effect is the best. The resin nozzle 8 should be connected to the cap 4 from the inside of the cap 4, and then connect the resin throat 9 from the outside of the cap 4 and make the lower end of the resin throat 9 and the upper end of the resin nozzle 8 closely contact to prevent The resin overflows. If the lower end of the resin throat 9 and the upper end of the resin nozzle 8 are not in close contact, the resin may overflow from the gap between the resin throat 9, the nozzle 8 and the cap 4.

[0034] The fiber throat pipe 6 is sheathed with a Teflon tube I7, and the lower end of the fiber throat tube 6 is detachably connected with a fiber nozzle 5; the Teflon tube I7 is mainly used to insulate heat and prevent resin heat from passing through the fiber throat tube 6. Pass to fiber 11. The fiber nozzle 5 can be detachably connected to the lower end of the fiber throat pipe 6 through threaded connection or interference fit. The detachable connection is used to prevent the fiber 11 from being blocked and unable to be cleaned when the resin enters the fiber throat 6. Because most of the molten resin will flow out of the nozzle outlet under the action of pressure, but a small part will gradually enter the fiber throat 6 along the pipe of the fiber 11. The fiber nozzle 5 can control the amount of resin entering by controlling the size of the outlet diameter, and can also guide the flow of the resin, thereby preventing the resin from entering the fiber throat 6.

[0035] The resin throat 9 is sheathed with a Teflon tube II 10, which is used for heat insulation to prevent heat from being transferred to the resin at the upper end of the resin throat tube 9, so that the resin at the upper end of the resin throat tube 9 is melted, thereby facilitating Block the resin pipe 9.

[0036] After the inner cavity 2 and the cap 4 are connected, a cavity 15 is formed. The cavity 15 is used to contain the melted resin and make the melted resin extrude from the lowermost outlet under the action of pressure.

[0037] The multiple ultrasonic generators 16 are fixedly connected to the outer wall of the heat conducting block 3 or the inner wall of the inner cavity 2, and are evenly distributed around the axis of the inner cavity 2. The ultrasonic generator 16 can be fixedly connected to the inner cavity 2 or the heat conducting block 3 by means of glue bonding or welding. If the ultrasonic generator 16 is fixedly connected to the inner wall of the inner cavity 2, the cap 4 needs to be provided with a hole for threading and sealing. The ultrasonic generator 16 can generate ultrasonic waves, thereby driving the molten resin to vibrate, so that the bonding effect between the resin and the fiber is greatly improved.

[0038] Specific implementation manner two:

[0039] Combine below figure 1 , 2 3. Description of this embodiment. This embodiment will further explain the first embodiment. The inner cavity 2 includes an inclined section I2-1 and a vertical section I2-2, and the fiber nozzle 5 includes an inclined section II5-1 and a vertical section II5. -2. The inclined section I2-1 of the inner cavity 2 and the inclined section II5-1 of the fiber nozzle 5 form a resin material flow guide cavity whose cross-sectional area decreases from top to bottom, and the vertical section I2 of the inner cavity 2 -2 forms a cylindrical extrusion cavity, and the vertical section II5-2 of the fiber nozzle 5 forms a cylindrical baffle column. The cross-sectional area of ​​the outlet of the grease flow guiding cavity is getting smaller and smaller, so that the flow speed of the resin increases, and the pressure at the outlet increases, so that the resin and fiber bonding effect is better, thereby improving the mechanical properties of the printed workpiece. The cylindrical extrusion cavity can make the resin fully wrap around the fiber, and is also used to improve the bonding performance of the resin and the fiber. The cylindrical baffle column is used to change the flow direction of the resin to reduce the probability of the resin flowing into the fiber throat 6.

[0040] Specific implementation manner three:

[0041] Combine below figure 1 , 2 3 illustrates this embodiment. This embodiment further illustrates the first embodiment. The lowermost end of the vertical section II5-2 of the fiber spray head 5 is located in the vertical section I2-2 of the inner cavity 2. This can effectively ensure that the fiber 11 is in the middle of the resin, thereby improving the printing effect.