阅读说明：本技术 一种3d四轴打印机及打印方法 (3D four-axis printer and printing method ) 是由 胡俊前 杨群 张宏兵 张睿 张海强 徐学骏 于 2021-07-19 设计创作，主要内容包括：本发明公开一种3D四轴打印机及打印方法,在现有通用的FDM型3D打印机结构的基础上增加一个旋转轴,旋转轴位于打印平台的下方,并与打印平台固定连接,该轴旋转带动打印平台同时旋转,使得打印平台在原有的沿Y轴方向移动的同时可以进行独立的旋转运动,旋转轴与步进电机通过联轴器连接,步进电机固定于打印机的Y轴上。切片方法是将产品的壁厚部分分成内壁和外壁两个部分,内壁按照产品正常的摆放位置沿高度方向(打印机Z轴方向)分层；然后将产品的三维模型旋转一定的角度,旋转角度的大小根据产品的形状确定,再将外壁按照产品旋转后的位置再沿高度方向(打印机Z轴方向)切片。切片后分别生成各自的打印程序。(The invention discloses a 3D four-axis printer and a printing method, wherein a rotating shaft is added on the basis of the structure of the existing universal FDM type 3D printer, the rotating shaft is positioned below a printing platform and is fixedly connected with the printing platform, the shaft rotates to drive the printing platform to rotate simultaneously, so that the printing platform can perform independent rotating motion while moving along the Y-axis direction, the rotating shaft is connected with a stepping motor through a coupler, and the stepping motor is fixed on the Y-axis of the printer. The slicing method is that the wall thickness part of the product is divided into an inner wall and an outer wall, and the inner wall is layered along the height direction (Z-axis direction of the printer) according to the normal placement position of the product; and then, rotating the three-dimensional model of the product by a certain angle, determining the size of the rotating angle according to the shape of the product, and slicing the outer wall along the height direction (the Z-axis direction of the printer) according to the rotated position of the product. After slicing, each print program is generated.)

1. The utility model provides a 3D four-axis printer, includes, printer body, moving part include X axle (1), Z axle (2), Y axle (3), print platform (4) and print shower nozzle (6) and constitute, its characterized in that, still has a rotation axis (5), the rotation axis is located print platform's below to with print platform fixed connection, this rotation of axes drives print platform rotatory simultaneously, makes print platform carry out independent rotary motion when original along the removal of Y axle direction, and the rotation axis passes through the coupling joint with step motor, and step motor is fixed in on the Y axle of printer.

2. A printing method for a printer according to claim 1, characterized in that the printing step is: dividing the wall thickness part of a product into an inner wall part and an outer wall part, wherein the inner wall part is layered along the height direction, namely the Z-axis direction of the printer, according to the normal placement position of the product; then, rotating the three-dimensional model of the product by 90 degrees, and slicing the outer wall along the height direction, namely the Z-axis direction of the printer, according to the rotated position of the product; after slicing, each print program is generated.

3. Printing method according to claim 2, characterised in that for a bent tube product, the product is divided lengthwise into three parts, a first straight part (7), a curved part (8), a second straight part (9); the slicing process is that the first straight line part (7) slices in layers along the height direction, namely the Z-axis direction of the printer; the bending part (8) is sliced layer by layer according to the Z-axis direction of the printer, but each layer is cut, the digital model of the product is rotated by 0.2-0.5 degrees, the size of the digital model depends on the radial size of the bent pipe, and the total rotation angle is equal to the time bending angle of the bent pipe; the second straight line part (9) slices in layers along the Z-axis direction of the printer at the rotated position; after slicing, each print program is generated.

Technical Field

The invention relates to the technical field of 3D printing, in particular to a novel 3D printing process, a slicing method for ensuring the process to be implemented and a mechanical structure.

Background

The motion mode of the traditional FDM type 3D printer is three-axis motion, namely reciprocating motion of a printing spray head along the X-axis direction and the Z-axis direction and reciprocating motion of a printing platform along the Y-axis direction.

The 3D printing process mainly comprises two parts, firstly, slicing the digital three-dimensional model of a printed piece by using software, generating a printing program, and printing an entity product by using a 3D printer according to the generated printing program. The traditional slicing method adopts a unidirectional slicing mode, namely, a three-dimensional model of a printed product is divided into a certain number of layers along the height direction (the positive direction of the Z axis of a printer), a printing program is generated, 3D printed pieces are printed in a layered mode, the layers are stacked layer by layer, and finally a solid product is formed. Firstly, the bonding force between layers is weak, so that the overall strength of the printed product is poor, and the actual use of the 3D printed product is influenced; secondly, for the products with inclined planes and bent tubes, a large amount of supports are needed during printing, so that the printing time is prolonged, the printing efficiency is low, and meanwhile due to the existence of the supports, the materials are wasted, and the surface roughness of the parts is influenced after the supports are removed.

Therefore, how to improve the overall strength of the product, enhance the practicability of the product, improve the 3D printing efficiency and quality, reduce the production cost and solve the problem in the application field of the 3D printing technology.

Disclosure of Invention

In order to solve the above problems, the present invention provides a new slicing method, and provides a new structure of a 3D printer to accommodate the new slicing method.

For products with strength requirements, the slicing method provided by the invention divides the wall thickness part of the product into an inner wall and an outer wall, and the inner wall is layered along the height direction (Z-axis direction of a printer) according to the normal placement position of the product; and then, rotating the three-dimensional model of the product by a certain angle, determining the size of the rotating angle according to the actual shape of the product, and slicing the outer wall along the height direction (the Z-axis direction of the printer) according to the rotated position of the product. After slicing, each print program is generated.

For the bent pipe products, the slicing method provided by the invention divides the products into three parts along the length direction, namely a first straight part 7, a bent part 8 and a second straight part 9. The slicing process is that the linear part 1 is sliced in layers along the height direction (the Z-axis direction of the printer); slicing the bent part in a layered mode in the Z-axis direction of the printer, wherein each layer is cut, the digital model of the product is rotated by 0.2-0.5 degrees (the larger size depends on the radial size of the bent pipe), and the total rotation angle is equal to the time bending angle of the bent pipe; the second straight line portion 9 slices in layers in the Z-axis direction of the printer at the rotated position. After slicing, each print program is generated.

In order to enable the printing program to print qualified products, the invention adds a rotating shaft on the basis of the structure of the existing general FDM type 3D printer to meet the rotating requirement in the slicing. The rotation axis is located print platform's below to with print platform fixed connection, this rotation of axes is that drive print platform is rotatory simultaneously, makes print platform can carry out independent rotary motion when original along the removal of Y axle direction, and the rotation axis passes through the coupling joint with step motor, and step motor is fixed in on the Y axle of printer.

Advantageous effects

1. Is an improvement of the traditional i3 and has simple manufacture.

2. The same material improves the strength of the printed object through different manufacturing processes.

3. When some complex angle models are printed, the material saving accords with the development of renewable energy sources.

4. The overall strength is higher when printing conventional objects than before.

5. No support is needed when printing elbows or other models that need support for angle reasons.

Drawings

Fig. 1 is a diagram of a four-axis printer model according to the present invention. In the figure: 1-X axis, 2-Z axis, 3-Y axis, 4-printing platform, 5-rotating shaft machine and 6-printing spray head.

Fig. 2 is a schematic structural view of a bent tube product.

Detailed Description

In order to fully describe the technical scheme of the invention, the following detailed description is combined with the accompanying drawings.

Fig. 1 is a structural diagram of a four-axis printer model according to the present invention. Like the structure of the conventional FDM3D printer, the main moving parts of the printer comprise an X-axis 1, a Z-axis 2, a Y-axis 3, a printing platform 4 and a printing spray head 6. But different from the structure of the conventional FDM3D printer, the printer of the present invention adds a rotating shaft mechanism 5, the rotating shaft of the rotating mechanism is located below the printing platform and is fixedly connected with the printing platform, the shaft rotation drives the printing platform to rotate simultaneously, so that the printing platform can perform independent rotating motion while moving along the Y-axis direction, the rotating shaft is connected with the stepping motor through a coupling, and the stepping motor is fixed on the Y-axis of the printer.

For the bent pipe products, the slicing method provided by the invention divides the products into three parts along the length direction, namely a first straight part 7, a bent part 8 and a second straight part 9. The slicing process is that the linear part 1 is sliced in layers along the height direction (the Z-axis direction of the printer); slicing the bent part in a layered mode in the Z-axis direction of the printer, wherein each layer is cut, the digital model of the product is rotated by 0.2-0.5 degrees (the larger size depends on the radial size of the bent pipe), and the total rotation angle is equal to the time bending angle of the bent pipe; the second straight line portion 9 slices in layers in the Z-axis direction of the printer at the rotated position. After slicing, the respective printing programs are generated and sent to the printer of the present invention for printing.