TWI664090B - Laminated forming system - Google Patents

Abstract

A laminated forming system includes a melt conveying unit, a nozzle unit, and a stage unit for heating and melting a plurality of sheet, powder, or granular plastic substrates into a melt material and outputting the melt. The nozzle unit includes a die that defines a hot runner, the hot pouring prop has an inlet through which the hot melt material passes, and an outlet for the hot melt material output. The stage unit includes a slide table that can be controlled to move relative to the die. The melt glue conveying unit can directly add plastic substrates that do not need to be processed in advance, and can melt the plastic substrates into melt glue materials, extrude them onto the slide table through the hot runner, and then cool and solidify. It doesn't need to be processed in advance, and can use a variety of sheet, powder, or granular plastic substrates without restrictions, and has a large degree of freedom.

Description

Laminated Forming System

The invention relates to a forming system, in particular to a laminated forming system that can directly use a sheet-shaped, powder-shaped, or granular plastic substrate as a raw material.

Laminated manufacturing and forming technology is a technology that has been developed very fast and has received much attention recently. It is mainly based on digital model files and uses adhesive materials such as powder metal or plastic to construct objects in a layer-by-layer addition method. Generally, the multilayer forming system using plastic as the material can only use pre-processed plastic wires as the substrate. These plastic wires are different from the plastic particles commonly used in plastic processing. Therefore, the plastic particles must be processed into plastic wires in addition, the steps are more complicated. And not all kinds of plastic particles can be processed into plastic wires, which results in the limitation of the types of plastic substrates of the multilayer forming system, so there is still room for improvement.

Therefore, an object of the present invention is to provide a multilayer forming system that can directly use a sheet-like, powder-like, or granular plastic substrate.

Therefore, the multilayer forming system of the present invention includes a melt conveying unit, a nozzle unit, and a stage unit for heating and melting a plurality of sheet, powder, or granular plastic substrates into a melt material and outputting the melt. The nozzle unit includes a die which defines a hot runner. The hot pouring prop has an inlet communicating with the melt transfer unit and allowing the melt substance to pass through, and an inlet opposite to the inlet for the melt substance output. Exit. The stage unit includes a slide table for carrying the melted substance output by the die head of the nozzle unit and controlled to move relative to the die head.

The effect of the present invention is that the melt glue conveying unit can directly add sheet, powder, or granular plastic substrates, and after melting the plastic substrates into a melt glue substance, it can be poured by the nozzle unit. After being extruded onto the slide table, it is cooled and solidified to form. As it can directly use sheet, powder, or granular plastic substrates, it does not need to be processed in advance, and it can use various plastic substrates without restrictions. , Great freedom.

Referring to FIG. 1, FIG. 2 and FIG. 3, an embodiment of the multilayer forming system of the present invention includes a melt transfer unit 1, a nozzle unit 2 connected to the melt transfer unit 1, and a nozzle unit 2 disposed below the nozzle unit 2. A stage unit 3 and a control unit 4 electrically connected to the nozzle unit 2 and the stage unit 3. The melt glue conveying unit 1 includes a temperature-controllable material tube 11, a pressing screw 12 rotatably coaxially disposed in the material tube 11 and extending along the axial direction of the material tube 11, and a charging screw capable of driving the pressure A driving module 13 for rotating the material screw 12 and a pressure sensor 14 capable of detecting the pressure in the material tube 11. The material tube 11 can heat and melt a plurality of plastic, powder, or granular plastic substrates into a melt glue substance, and drive the charging screw 12 through the driving module 13 to rotate the melt glue substance. This material pipe 11 is conveyed. In this embodiment, the material tube 11 controls the temperature through a digital temperature control PID, and the pressure sensor 14 monitors and controls the pressure in the material tube 11 by the rotation speed of the material screw 12, and the material is charged. The rotation speed of the screw 12 is about 1 ~ 36RPM, and the extruding capacity is 0.12 ~ 4kg / hr. The driving module 13 is a 750W feedback motor, which can control the rotation speed of the charging screw 12.

The nozzle unit 2 includes a die 21 that defines a hot runner 210 and is connected to the material pipe 11 of the melt transfer unit 1, and a die 21 located in the die 21 and capable of sliding downward relative to the die 21.阀 针 22。 Valve needle 22. The die 21 is recessed to form a channel 211 extending downward from the top surface and communicating with the hot runner 210. The hot runner 210 has an inlet 212 communicating with the material pipe 11, an outlet 213 opposite to the inlet 212 and facing the stage unit 3, and a connection 211, the inlet 212, and the outlet 213 and along the The connecting section 214 extends in the up-down direction. The lower end of the communication segment 214 is gradually closed and is generally tapered. The valve needle 22 passes through the channel 211 from top to bottom and extends into the communication section 214. The bottom end of the valve needle 22 is gradually closed to form a sharp cone shape. In this embodiment, the diameter of the outlet 213 is 1 mm, and the die head 21 is a replaceable design. The diameter of the outlet 213 can be changed as required. The valve needle 22 is driven by a servo motor and a screw mechanism to drive the valve needle 22 to move up and down, and its lead is less than or equal to 5 mm. When the valve needle 22 is driven, it moves up and down relative to the die 21 along the channel 211, so that the length extending into the communication section 214 is increased or decreased, and the cross-sectional area of the communication section 214 is changed. The pointed end of the valve needle 22 and the tapered lower end of the communication section 214 correspond to each other. When the valve needle 22 moves downward to bring the two closer, the valve needle 22 causes the communication section 214 to intercept. The area is reduced, which further increases the pressure difference between the inlet 212 and the outlet 213. Conversely, when the valve needle 22 moves upward, the pressure difference between the inlet 212 and the outlet 213 decreases. The pressure difference can be adjusted by changing the pressure difference. The flow rate of the melted substance output from the outlet 213.

The stage unit 3 includes a slide table 31 that is horizontally disposed and directly below the outlet 213 of the nozzle unit 2, and a triaxial driver 32 that can move the slide table 31 in three axial directions. In this embodiment, the slide table 31 is a CKD ETS electric slide table 31 with a size of 300x300x400mm. The three-axis driver 32 has a 20-bit resolution motor and drives the slide table 31 to move through the chariot chain. The control unit 4 includes a pressure monitoring module 41 that can sense the pressure in the hot runner 210 of the nozzle unit 2 and control the movement of the valve needle 22 of the nozzle unit 2, and an electrical connection to the pressure monitoring module 41. And the human-machine interface module 42 of the three-axis driver 32. After measuring the pressure in the hot runner 210, the pressure monitoring module 41 can subtract the pressure value set by the pressure sensor 14 of the melt transfer unit 1 to obtain the pressure difference between the two. This pressure difference is the pressure difference between the inlet 212 and the outlet 213 of the feed pipe 11. By controlling the aforementioned pressure difference, the output flow of the hot melt substance in the hot runner 210 can be controlled.

In this embodiment, a sheet-shaped, powder-shaped, or granular plastic substrate can be directly placed, and converted into a melt-adhesive substance through the melt-adhesive conveying unit 1, and then the opening degree can be adjusted by controlling the upward and downward movement of the valve needle 22. It can control the flow rate of the melted substance after passing through the hot runner 210. The extruded melted substance will be formed on the slide table 31, and the triaxial driver 32 will drive the slide according to the digital position input in advance. The slide table 31 moves the slide table 31 relative to the nozzle unit 2, and further controls the hot melt material to form a desired shape on the slide table 31.

In summary, the melt adhesive conveying unit 1 can directly use sheet, powder, or granular plastic substrates, without the need to process the plastic substrates into plastic wires. The materials are relatively unrestricted and pass through the valve. The upward and downward displacement of the needle 22 can adjust the opening degree, thereby controlling the output flow of the melt glue material, so the purpose of the invention can be achieved.

However, the above are only examples of the present invention. When the scope of implementation of the present invention cannot be limited in this way, any simple equivalent changes and modifications made in accordance with the scope of the patent application and the content of the patent specification of the present invention are still Within the scope of the invention patent.

1‧‧‧ Melt Adhesive Conveying Unit

11‧‧‧ material tube

12‧‧‧Feeding screw

13‧‧‧Drive Module

14‧‧‧Pressure sensor

2‧‧‧ Nozzle Unit

21‧‧‧die

210‧‧‧ hot runner

211‧‧‧channel

212‧‧‧Entrance

213‧‧‧Export

214‧‧‧connected section

22‧‧‧ Valve Needle

3‧‧‧stage unit

31‧‧‧Slide

32‧‧‧Three-axis driver

4‧‧‧Control unit

41‧‧‧Pressure Monitoring Module

42‧‧‧Human Machine Interface Module

Other features and effects of the present invention will be clearly presented in the embodiment with reference to the drawings, in which: FIG. 1 is a schematic diagram illustrating an embodiment of the multilayer forming system of the present invention; FIG. 2 is a top view, and FIG. A control unit of this embodiment is not shown; and FIG. 3 is a schematic diagram illustrating a nozzle unit and a control unit in this embodiment.

Claims (5)

A laminated forming system includes: a melt adhesive conveying unit for heating and melting a plurality of sheet, powder, or granular plastic substrates into a melt adhesive material and outputting the same; a nozzle unit including a hot melt pouring A die head of the tunnel, the hot pouring prop has an inlet communicating with the melt conveying unit for the melt material to pass through, and an outlet opposite to the inlet and outputting the melt material; and a stage unit including A slide table for carrying the melt glue substance output from the die head of the nozzle unit and controlled to move relative to the die head. The multilayer forming system according to claim 1, wherein the hot runner of the nozzle unit further has a communication section connecting the inlet and the outlet, the die head is recessed to form a channel connecting the communication section, and the nozzle unit is further It includes a valve needle extending through the channel and placed in the communication section. The valve needle can be controlled to slide along the channel relative to the die and change the cross-sectional area of the communication section. The layer forming system according to claim 2, wherein the glue conveying unit includes a material pipe capable of controlling temperature and communicating with the inlet of the nozzle unit, a rotatably disposed in the material pipe and along the material pipe. An axially extending charging screw and a driving module capable of driving the charging screw to rotate to transfer the melted glue material along the feeding tube. The build-up forming system according to claim 3, wherein the glue conveying unit further comprises a pressure sensor capable of detecting the pressure in the material tube, the build-up forming system further includes a control unit, and the control unit includes a Pressure monitoring module capable of sensing the pressure in the hot runner of the nozzle unit and controlling the movement of the valve needle of the nozzle unit. The multilayer forming system according to claim 4, wherein the stage unit further includes a three-axis driver capable of driving the slide table, and the control unit further includes an electrical connection to the pressure monitoring module and the three-axis driver. HMI module.