CN112454896A

CN112454896A - Base support for top angle landing of additive manufacturing cube unit type and design method thereof

Info

Publication number: CN112454896A
Application number: CN202011292042.9A
Authority: CN
Inventors: 严鹏飞; 唐晨松; 丁越寅; 严彪
Original assignee: Tongji University
Current assignee: Tongji University
Priority date: 2020-11-18
Filing date: 2020-11-18
Publication date: 2021-03-09

Abstract

The invention relates to a base support for landing of a vertex angle of a cube unit type in additive manufacturing and a design method of the base support. Compared with the prior art, the invention can provide necessary stable support for the unbalanced structure with the downward vertex angle, so that the cubic unit structure with the downward vertex angle can be stably placed, and the 3D printing is convenient to carry out.

Description

Base support for top angle landing of additive manufacturing cube unit type and design method thereof

Technical Field

The invention relates to an accessory for additive manufacturing, in particular to a base support for a top angle landing of a cubic unit type for additive manufacturing and a design method thereof.

Background

Additive manufacturing although virtually all shapes can be made theoretically, in actual practice, due to limitations in the dicing pattern. Printing needs to limit the suspension angle, and suspension structures cannot be generated, so that a plurality of structures cannot be printed, or reasonable supporting structures need to be added. When the apex angle like the apex angle of cube, right angle triangular pyramid fallen to the ground, to the printing of other faces, need increase the base and support cube or right angle triangular pyramid to print other faces.

At present, unsupported suspended structures, such as negative poisson ratio structures, can appear in some novel cubic periodic symmetric structure models when the models are placed, so that the models can not be printed under common conditions.

Disclosure of Invention

The present invention is directed to overcoming the above-mentioned drawbacks of the prior art and providing a base support for additive manufacturing of a corner landing of a cubic unit type and a method for designing the same.

The purpose of the invention can be realized by the following technical scheme:

the utility model provides a base is supported that is used for apex angle of additive manufacturing cube cell type to fall to ground, includes the support to and set up at the support top and the assorted recess of cube apex angle.

Further, the support is a triangular pyramid.

Furthermore, the support is a triangular pyramid vertical cutting angle, and the bottom surface is hexagonal.

Further, the bottom corner of the groove is arranged on the bottom surface of the support or in the support.

Further, the support is of a lattice structure or a solid structure.

More preferably, the support is of a lattice structure, so that the support is lighter in weight.

A design method for a base support used for the floor of a vertex angle of a cube unit type in additive manufacturing comprises the following specific steps:

(a) rotating the cubic unit to be processed to a required position, namely, enabling a plane to be processed to be parallel to the bottom surface;

(b) creating a support;

(c) and (4) taking the support as a Boolean difference set for the cube, and taking the difference set part to obtain the base support.

Further, in step (c): the differential set part of the support is subjected to vertical cutting or suspended beveling or protruding beveling, so that unnecessary materials and space are reduced.

Further, the base support is a porous support filled by a lightweight hollow porous structure or a lattice grid structure.

Compared with the prior art, the invention can provide necessary stable support for the unbalanced structure with the downward vertex angle, so that the cubic unit structure with the downward vertex angle can be stably placed, and the 3D printing is convenient to carry out.

Drawings

FIG. 1 is a schematic structural view of a support base constructed in embodiment 1 of the present invention;

fig. 2 is a schematic structural view of a support base after corner cutting in embodiment 1 of the present invention;

fig. 3 is a schematic structural view of a support base constructed in embodiment 2 of the present invention.

The reference numbers in the figures indicate:

1. support, 2, recess.

Detailed Description

The invention is described in detail below with reference to the figures and specific embodiments.

Example 1

The utility model provides a base is supported that is used for apex angle of additive manufacturing cube cell type to fall to ground, includes support 1 to and set up at support 1 top and cube apex angle assorted recess 2. The support 1 is a triangular pyramid or a triangular pyramid vertical cutting angle to form a hexagonal bottom surface. The bottom corner of the recess 2 is at the bottom surface of the holder 1 or in the holder 1. The support 1 can be designed to be lightweight and hollow, for example, the support can be designed to be a lattice structure, and the support can have enough support strength for the structure.

A3 mm external square support is constructed by the following specific operations:

1. firstly, the cube is rotated to a required position, and the specific steps are as follows:

a) the upper left corner of the upper plane is rotated to minus 45 degrees around the Z axis as the rotation center.

b) 54.745 DEG about the Y axis with the default center of the part as the center of rotation.

c) And finally, placing two cubes at positions, wherein one vertex of each cube faces downwards, and the planes enclosed by three adjacent vertices of the cube are parallel to each other.

2. The specific method for adding the related support is as follows:

a) a triangular pyramid was created with a base center to apex distance of 7.349mm and a height of 5.196mm, the triangular pyramid apex pointing upwards and the apex angles of the three adjacent faces all being 90 °.

b) The height of the triangular pyramid is taken as a rotating shaft, and the triangular pyramid is rotated by 60 degrees so that the side surfaces of the triangular pyramid are parallel to the three lower planes of the cube.

c) And translating the triangular pyramid to ensure that the vertex angle of the triangular pyramid coincides with the top vertex angle of the cube, and the side faces coincide with three faces above the cube where the vertex angle is located.

d) A solid cube was created with a side length consistent with a negative poisson's ratio structure (i.e., 3mm on a side).

e) And (4) making a Boolean difference set on the solid cube by the triangular pyramid, and making a difference set part by the triangular pyramid.

f) The negative poisson's ratio structure is translated to the solid cubic void portion that is deducted and the model is repaired using the intra-procedural repair fracture function.

In order to reduce unnecessary printing bases, a corner cutting method may be adopted. Preferably, the vertical cut is made in such a way that the extreme cut angles are such that six corners of the cube parallel to the bottom surface constitute a hexagon, whereas the vertical direction projects to the smallest part of the bottom surface when the sample is a cuboid. Or a suspended oblique cutting or a protruding oblique cutting, and an inclined cone angle is arranged on the minimum projection surface.

The base support obtained as described above may be filled with a lightweight hollow porous structure or lattice structure to constitute a porous support as long as sufficient support strength is secured for the structure.

Example 2

When the sample to be printed is a cuboid formed by splicing a plurality of cubes, the shape of the groove 2 is matched with one corner of the cuboid, as shown in fig. 3.

The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.

Claims

1. The utility model provides a base that apex angle that is used for additive manufacturing cube cell type falls to ground supports, its characterized in that includes the support to and set up at the support top and the assorted recess of cube apex angle.

2. The pedestal support for a corner landing of an additive manufactured cube cell type of claim 1, wherein the pedestal is a triangular pyramid.

3. The pedestal support for the corner landing of an additive manufactured cube cell type of claim 1, wherein the pedestal is a triangular pyramid vertical chamfer and the bottom surface is hexagonal.

4. The base support for a corner landing of an additive manufactured cube unit form of claim 1, wherein the bottom corner of the recess is at a bottom surface of the pedestal.

5. The base support for a corner landing of an additive manufactured cube unit form of claim 1, wherein a bottom corner of the recess is in a seat.

6. The base support for a corner landing of an additive manufacturing cube unit form of claim 1, wherein the support is a lattice structure or a solid structure.

7. The base support for a corner landing of an additive manufacturing cube unit form of claim 6, wherein the support is a lattice structure.

8. The method for designing a base support for additive manufacturing of a corner landing of a cubic unit type according to claim 1, comprising the following specific steps:

(b) creating a support;

9. The method of claim 8, wherein in step (c): and (4) performing vertical cutting or suspended beveling or protruding beveling on the part of the support with the difference set.

10. The method of claim 8, wherein the base support is a porous support filled with a lightweight hollow porous structure or lattice grid structure.