阅读说明：本技术 一种3d打印汽车活塞 (3D prints car piston ) 是由 张钧翀 曾勇 于 2021-05-25 设计创作，主要内容包括：一种3D打印汽车活塞涉及汽车活塞技术领域,包含活塞顶部、活塞环槽部以及活塞裙部。活塞外部壳状结构,内部由抗冲击结构阵列排布而成,当活塞在使用中发生摩擦碰撞时,点阵结构通过吸收能量来减轻对活塞整体的伤害,起到保护作用；同时,在活塞工作时,这种特殊的结构使得活塞整体的受力更均匀,可以抵抗更多冲击力；此外,活塞采用AlSi-(10)Mg材料进行3D打印而成,镂空的点阵结构设计减轻了活塞的重量同体积的材料质量减少50％,使用更加安全可靠,使用寿命也相应得到提高。(The utility model provides a 3D prints car piston relates to car piston technical field, contains piston top, piston ring slot portion and piston skirt portion. The piston is of a shell-shaped structure outside, and the interior of the piston is formed by arranging an anti-impact structure in an array mode, when the piston is in friction collision in use, the lattice structure reduces the damage to the whole piston by absorbing energy, and the protection effect is achieved; meanwhile, when the piston works, the whole stress of the piston is more uniform due to the special structure, and more impact force can be resisted; in addition, the piston adopts AlSi 10 The Mg material is printed in 3D mode to form, the hollow dot matrix structure design reduces the weight of the piston by 50% with the material mass of the same volume, the use is safer and more reliable, and the service life is correspondingly prolonged.)

1. The utility model provides a 3D prints car piston, contains piston top, piston ring slot portion and piston skirt portion, and its characterized in that car piston's impact effect regulates and control through the density that changes the inside unit lattice dot matrix of piston, and car piston manufacture process includes following step:

(1) designing an inner shell layer structure and an outer shell layer structure; designing an inner shell layer and an outer shell layer of the piston by using UG three-dimensional modeling software, wherein the outer shell layer and the inner shell layer are both in a tightly packed structure and are used for connecting a lattice structure, the inner shell layer and the outer shell layer are designed by using the three-dimensional modeling software, and the surface of the inner shell layer and the surface of the outer shell layer are generated by performing surface fitting on the appearance and the points of the inner surface and the outer surface of the piston to form a shell-shaped solid model;

(2) designing a lattice structure; introducing the designed inner and outer shell-shaped structures into a Rhino three-dimensional modeling software, filling lattices between inner and outer shell layer curved surfaces through the Rhino, selecting cross lattices as lattice units, respectively setting the number of the lattices to be 19, 13 and 3 in the direction of X, Y, Z, setting the diameter of a middle beam of the lattices to be 0.8cm, generating lattice layer lattice units as shown in figure 2, obtaining lattice structures, laminating the lattice structures with the inner and outer shells, and generating an integral model to derive an STL format model;

(3) a production process of the piston; and (3) slicing the STL model, guiding the STL model into an SLM type 3D printing device, and printing the STL model by using the SLM type 3D printing device, wherein the printing layer thickness is 0.02 cm.

2. The automotive piston of claim 1, wherein: in the printing process in the step (3), the printing material is selected from AlSi10 Mg.

Technical Field

The invention relates to the technical field of automobile pistons, in particular to a 3D printing automobile piston and a manufacturing method thereof.

Background

The piston is a central part which does reciprocating motion in an automobile engine, and occupies an extremely important position in the operation of the whole engine, along with the continuous improvement of the automobile performance, the power of the engine as the heart of the automobile is also increased, and the piston is particularly important in the automobile manufacturing industry. The piston is connected with the connecting rod in the using process, and the piston is matched with the connecting rod to realize the piston movement of the piston and provide power. The piston mainly comprises three parts, which are respectively: top portion, annular groove portion and skirt portion. The top of the piston is the main part of the combustion chamber, the shape of the piston is related to the selected combustion chamber form, the gasoline engine mostly adopts a flat-top piston, the engine has the advantages of small heat absorption area, the top of the piston of the diesel engine is often provided with various pits, and the specific shape, position and size of the pits are adapted to the requirements of forming and burning the mixed gas of the diesel engine. Therefore, the piston is in a severe working environment with high speed, high pressure and high temperature for a long time, the stable and durable running of the engine is considered, the requirement on the material is very strict, the piston has enough strength and rigidity, small expansion coefficient, small relative density, wear resistance and corrosion resistance and low cost, the piston of the common automobile engine at present is generally made of aluminum alloy, and the quality of the piston can not be reduced almost due to a compact structure. However, the aluminum alloy piston obtained by the existing manufacturing mode is only subjected to impact stamping by virtue of the self performance of the alloy, and the impact stamping performance of the aluminum alloy piston is difficult to improve.

Disclosure of Invention

The invention aims to provide an impact-resistant 3D printing automobile piston which can play a role of impact resistance by utilizing the design of a dot matrix, and meanwhile, the weight is reduced and the use is safer under the condition of not changing the size of the piston.

The implementation scheme of the invention is as follows:

the utility model provides a 3D prints car piston, contains piston top, piston ring slot portion and piston skirt portion, prints the in-process at 3D, regards above-mentioned part as the piston wholly, divide into shell layer, inner shell layer, dot matrix layer triplex with it.

The overall shape of the automobile piston is designed, and a flat-top piston design mode is selected as an indication. The piston size ratio can be obtained by scanning the existing piston size, and the piston material is selected from AlSi10Mg as the main material without being limited to a specific size.

The piston comprises an outer shell layer, an inner shell layer and a dot matrix layer, wherein the outer shell layer and the inner shell layer are of tightly packed structures and are used for connecting dot matrix structures, the inner shell layer and the outer shell layer are designed by using three-dimensional modeling software, the surface fitting is carried out on the appearance and the points of the inner surface and the outer surface of the piston to generate the surface of the inner shell layer and the outer shell layer, and a shell-shaped solid model is formed. The inner-layer shell-shaped structure and the outer-layer shell-shaped structure are led into a Rhino modeling software for lattice filling, cross lattices are selected as lattice units, the units form triangles by lines, compared with a common mode that a body center lattice structure and a face center lattice structure are combined by a triangle and a square, the stability is improved by 20%, the stress is uniform, under the same material, the shock resistance is improved while the quality is reduced, the service life is prolonged by 50%, and therefore the lattice structure is adopted as a filling lattice of the automobile piston. The lattice is filled with X, Y, Z fixed quantity of three shafts, 19, 13 and 3, the diameter of the middle beam of the lattice is 0.8cm, and the lattice structure is laminated with the inner shell and the outer shell to generate an integral model to derive the STL format model.

The automobile piston is produced in a 3D printing mode due to the fact that the structure of the automobile piston is complex, firstly, the STL model is sliced, then the STL model is led into SLM type 3D printing equipment, printing materials are AlSi10Mg, the thickness of a printing layer is 0.02cm, and the model obtained after printing is simply processed.

The invention has the beneficial effects that:

compared with the existing automobile piston, the invention has the following remarkable advantages: the invention adopts the design of a dot matrix structure, and when the piston works, the special structure ensures that the whole piston is stressed more uniformly and can resist more impact force; in addition, the design of the dot matrix enables the weight of the piston to be reduced, the mass of the material with the same volume to be reduced by 50%, and the piston is safer and more reliable to use while the production cost is reduced.

Drawings

Fig. 1 is a schematic view of an overall model.

FIG. 2 is a schematic diagram of a lattice layer lattice cell model.

Fig. 3 is a particle diagram of AlSi10Mg powder.

Fig. 4 is a schematic cross-sectional view of the piston.

In the figure: piston crown 1, ring groove 2, piston group 3.

Detailed Description

The technical solution of the present invention is further described with reference to the accompanying drawings and the detailed description.

As shown in fig. 1-4, the overall shape of the automobile piston is designed, and the design mode of the flat-top piston is taken as an illustration. The piston size ratio can be obtained by scanning the existing piston size, and the piston material is selected from AlSi10Mg as the main material without being limited to a specific size.

The utility model provides a 3D prints car piston, contains piston top, piston ring slot portion and piston skirt portion, and its characterized in that car piston's shock-resistant effect can be regulated and control through the density that changes the inside unit lattice dot matrix of piston, and car piston manufacture process includes following step:

(1) and designing an inner shell layer structure and an outer shell layer structure. By scanning the existing piston size, regardless of a particular size alone. The inner shell layer and the outer shell layer of the piston are designed by UG three-dimensional modeling software, the outer shell layer and the inner shell layer are both in a tightly packed structure and are used for connecting a lattice structure, the inner shell layer and the outer shell layer are designed by the UG three-dimensional modeling software, the surface fitting is carried out on the inner surface appearance and the outer surface appearance of the piston and points to generate the surface of the inner shell layer and the outer shell layer, and a shell-shaped solid model is formed.

(2) And designing a lattice structure. The designed inner and outer shell-shaped structures are led into a Rhino three-dimensional modeling software, lattice filling is carried out between inner and outer shell layer curved surfaces through the Rhino, cross lattices are selected as lattice units, the energy absorption of the lattice structure is higher than that of a common body-centered cubic structure, the number of the lattices is respectively set to be 19, 13 and 3 in the direction X, Y, Z, the diameter of a lattice center beam is set to be 0.8cm, lattice layer lattice units shown in figure 2 are generated, a lattice structure is obtained, and the lattice structure and the inner and outer shells are laminated to generate an integral model to derive an STL format model.

(3) And (3) a production process of the piston. And slicing the STL model, guiding the STL model into an SLM type 3D printing device, selecting AlSi10Mg as a printing material, wherein the thickness of the printing layer is 0.02cm, and no support is required to be added when the SLM type 3D printing device is used for printing, so that the post-processing time is reduced.

(4) And (5) post-processing the model. After the model is printed, the model is simply processed by clear water, and relevant inspection is obtained and the model can be put into use after being qualified.

The inner shell and the outer shell in the step (1) are in a compact and packed structure, and the size can be obtained by scanning the size of the existing piston without being limited to a specific size.

Due to the existence of the dot matrix in the step (2), the weight of the whole piston is reduced under the condition that the volume is not changed, and the supporting and pressure-resisting capabilities of the dot matrix structure are excellent.

In the printing process in the step (3), the printed thickness is 0.02cm, which is one of the most accurate printing thicknesses of the AlSi10Mg formed by SLM at present, and the performance of the integrally formed automobile piston can be ensured by the high precision.

The key point of the invention lies in the design of lattice layers, cross lattice units are adopted as design units, lattice units are filled between an inner layer and an outer layer, the number of the lattice units of each layer is fixed, the difficulty of the invention lies in the filling of AlSi10Mg lattice by 3D printing, the traditional automobile piston requires compact and dense metal, the invention adopts Rhino software to fill the lattice in a parameterization mode, so that the outer structure of the inner layer and the outer layer of the obtained piston is compact, and a certain gap is reserved in the inner lattice relatively, but the lattice structure can well reduce the metal usage amount so as to reduce the overall weight, and in addition, the stable lattice support structure can also effectively resist the impact force, thereby prolonging the service life of the automobile piston and reducing the cost.

The three parts of the automobile piston are regarded as a three-layer structure integrally formed in a 3D printing mode, an inner layer structure and an outer layer structure are designed through three-dimensional modeling software, a lattice structure is filled between the inner layer and the outer layer, a finally generated model file is guided into the software for slicing, the sliced file is guided into a 3D printer for printing, the complex lattice structure can be produced through the 3D printing mode, a physical model formed after printing is simply processed, and the obtained relevant inspection and detection are qualified and can be put into use.

While the invention has been described with reference to specific preferred embodiments, it will be understood by those skilled in the art that various changes and modifications may be made therein without departing from the general concept of the invention as defined by the appended claims.