CN114407369B

CN114407369B - Z-axis compensation method of three-dimensional model based on three-dimensional printing

Info

Publication number: CN114407369B
Application number: CN202210111295.4A
Authority: CN
Inventors: 王松; 张朝鑫; 安峰; 郁荫; 任泉珲
Original assignee: Shanghai Mange Technology Co ltd
Current assignee: Shanghai Mange Technology Co ltd
Priority date: 2022-01-29
Filing date: 2022-01-29
Publication date: 2024-07-09
Anticipated expiration: 2042-01-29
Also published as: CN114407369A

Abstract

The invention discloses a Z-axis compensation method of a three-dimensional model based on three-dimensional printing, which comprises the following steps: (1) Recognizing all triangles with normal Z-axis values smaller than 0 in the three-dimensional model A, and generating a new model B; (2) Copying the triangle in the B model one more time, adding the Z values of the vertexes of the triangle which is copied one more time to the set Z compensation height, and then connecting the original triangular surface patch of the B model and the newly copied surface patch at the surface patch boundary to form a closed entity; (3) And performing Boolean subtraction on the model B by the model A to obtain a C model, namely a model after Z-axis compensation. Compared with the prior art, the invention has the beneficial effects that: according to the Z-axis compensation method of the three-dimensional model based on three-dimensional printing, errors between the model after printing and the designed model can be reduced when the model is subjected to three-dimensional printing; the robust algorithm is adopted, so that the method is applicable to all models and high in speed.

Description

Z-axis compensation method of three-dimensional model based on three-dimensional printing

Technical Field

The invention relates to the technical field of 3D printing, in particular to a Z-axis compensation method of a three-dimensional model based on three-dimensional printing.

Background

Along with the development of science and technology, the three-dimensional printing technology is increasingly applied to various fields of production and life, and influences our life. The technology has application in jewelry, footwear, industrial design, construction, engineering and construction (AEC), automotive, aerospace, dental and medical industries, education, geographic information systems, civil engineering, firearms, and other fields. Three-dimensional printing technology is not a technology, and is a generic term for various three-dimensional printing technologies. Common three-dimensional printing techniques are "fused deposition" (FDM), "LCD selective area light transmission principle" (LCD), "digital light processing" (DLP), "stereolithography" (SLA), "selective laser sintering" (SLS), "selective laser melting" (SLM), and the like. For models built with SLA and SLA techniques, excessive curing may result in additional material build-up on the downward surface. The first layer of a model is likely to be thicker than the underlying layer. To avoid the time consuming process of manually correcting these errors after the part is completed, the operator uses a Z-axis compensation function to avoid manually correcting these errors after the part is completed.

In the existing three-dimensional software: some three-dimensional software has a Z-axis compensation function, but the method is not very good, and especially for parts with complex structures, such as sole models (because soles have a plurality of lines with different sizes and different shapes), the effect of Z-axis compensation is poor, the models are damaged, and meanwhile, the speed is low, the memory occupation is high, and the like.

Disclosure of Invention

The invention aims to provide a Z-axis compensation method of a three-dimensional model based on three-dimensional printing, which aims to solve the problems in the background technology.

In order to achieve the above purpose, the present invention provides the following technical solutions:

A Z-axis compensation method of a three-dimensional model based on three-dimensional printing comprises the following steps:

(1) Recognizing all triangles with normal Z-axis values smaller than 0 in the three-dimensional model A, and generating a new model B;

(2) Copying the triangle in the B model one more time, adding the Z values of the vertexes of the triangle which is copied one more time to the set Z compensation height, and then connecting the original triangular surface patch of the B model and the newly copied surface patch at the surface patch boundary to form a closed entity;

(3) And performing Boolean subtraction on the model B by the model A to obtain a C model, namely a model after Z-axis compensation.

As a further scheme of the invention: before the step 1, a Z compensation height is manually set for the three-dimensional model A in advance.

Compared with the prior art, the invention has the beneficial effects that: according to the Z-axis compensation method of the three-dimensional model based on three-dimensional printing, errors between the model after printing and the designed model can be reduced when the model is subjected to three-dimensional printing; the robust algorithm is adopted, so that the method is applicable to all models, is high in speed, saves the software operation time of operators, and improves the printing success rate of the operators.

Drawings

Fig. 1 is a schematic diagram of a model a in a first embodiment of the present invention.

Fig. 2 is a schematic diagram of the size of the bounding box of the model a according to the first embodiment of the present invention.

Fig. 3 is a schematic structural diagram of a model B according to a first embodiment of the present invention.

Fig. 4 is a schematic diagram of a model B closure entity in accordance with a first embodiment of the present invention.

Fig. 5 is a schematic diagram of a model C in a first embodiment of the invention.

Fig. 6 is a schematic diagram of a model C bounding box in accordance with an embodiment of the present invention.

Fig. 7 is a schematic diagram of a gear part before Z-axis compensation in a second embodiment of the present invention.

Fig. 8 is a schematic diagram of a gear part after Z-axis compensation in a second embodiment of the present invention.

Fig. 9 is a schematic diagram showing the comparison of the Z-axis compensation of the gear part in the second embodiment of the present invention.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In an embodiment of the present invention, a Z-axis compensation method for a three-dimensional model based on three-dimensional printing is provided, which is only required to set a Z-compensation height Zheight by a user, and includes the following steps:

(1) Setting Z compensation height Zheight to be 0.18mm in stl format file three-dimensional model A, identifying triangles with normal Z axis values smaller than 0 in model A as shown in figures 1 and 2, and generating a new model B which only contains the identified triangles as shown in figure 3;

(2) The triangle in the B model is duplicated one more and the Z values of the vertices of the duplicated triangle are added to Zheight, and then the original triangle patch and the newly duplicated patch of the B model are connected at the patch boundary. The B model thus constitutes a closed entity, as shown in fig. 4.

(3) Model A performs Boolean subtraction on model B, namely A-B, to obtain a C model, namely the final Z-axis compensation result needed by us, as shown in figures 5 and 6.

In the second embodiment, as shown in fig. 7 and 8, the gear part models with the length, width and height of 23mm, 19mm and 23mm are used for performing the Z-axis compensation operation by the method, the Z-axis compensation height is 0.18 mm, and after the Z-axis compensation is performed by the method shown in fig. 9, all triangles of the gear part models with the normal directions facing downwards are lifted upwards by Zheight height, so that the requirements of three-dimensional printing operators are met.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.

Claims

1. A Z-axis compensation method of a three-dimensional model based on three-dimensional printing is characterized by comprising the following steps of: the method comprises the following steps:

(1) Identifying all triangular patches with normal Z-axis values smaller than 0 in the three-dimensional model A, and generating a new model B;

(2) Copying the triangular patches in the B model one more, adding the Z values of the vertexes of the triangular patches which are copied one more to the set Z compensation height, and then connecting the original triangular patches of the B model and the newly copied patches at the patch boundaries to form a closed entity;

(3) Carrying out Boolean subtraction on the closed entity by the model A to obtain a C model, namely a model after Z-axis compensation;

before the step (1), a Z compensation height is manually set for the three-dimensional model A in advance.