阅读说明：本技术 一种基于3d打印的喷管用复合材料固定壳体 (3D printing-based composite material fixing shell for spray pipe ) 是由 王敏 赵永忠 赵威 刘小平 刘丰 修经纬 张永乐 王浩然 刘晓军 呼日查 邹爱玲 于 2020-11-30 设计创作，主要内容包括：本发明涉及一种基于3D打印的喷管用复合材料固定壳体,分为法兰段、凸止口段、锥段和台阶段,法兰段为圆柱形等壁厚结构,端面上周向均布有多个圆孔；止口段为短圆柱等壁厚结构,与法兰段垂直；锥段为圆锥形等壁厚结构,与凸止口段和法兰段平滑过渡连接；台阶段为回转体,内表面为端面,外表面为短端面+锥面；台阶段一端为一级阶梯结构,另一端与锥段平滑过渡连接；法兰段、凸止口段、锥段和台阶段均为连续纤维增强复合材料,采用增材制造工艺一体化成型,各部分结构平滑过渡连接。本发明实现了3D打印复合材料固定壳体的成形,降低了喷管的结构质量,提高了发动机的质量比,对支撑导弹武器未来的升级跨代具有重要意义。(The invention relates to a composite material fixing shell for a spray pipe based on 3D printing, which is divided into a flange section, a convex spigot section, a conical section and a step section, wherein the flange section is of a cylindrical structure with equal wall thickness, and a plurality of round holes are uniformly distributed on the end surface in the circumferential direction; the spigot section is a short cylinder with equal wall thickness and is vertical to the flange section; the conical section is of a conical structure with equal wall thickness and is in smooth transition connection with the male spigot section and the flange section; the stage is a revolving body, the inner surface is an end surface, and the outer surface is a short end surface plus a conical surface; one end of the step section is of a one-stage step structure, and the other end of the step section is in smooth transition connection with the conical section; the flange section, the convex spigot section, the conical section and the step section are all made of continuous fiber reinforced composite materials and are integrally formed by adopting an additive manufacturing process, and all the parts are connected in a smooth transition mode. The forming method realizes the forming of the 3D printing composite material fixed shell, reduces the structural quality of the spray pipe, improves the mass ratio of the engine, and has important significance for supporting future upgrading and upgrading of missile weapons.)

1. The utility model provides a casing is fixed to combined material for spray tube based on 3D prints, divide into flange section (1), protruding tang section (2), conic section (3) and platform stage (4), its characterized in that:

the flange section (1) is of a cylindrical structure with equal wall thickness, and a plurality of round holes are uniformly distributed on the end surface in the circumferential direction;

the convex spigot section (2) is of a short cylinder equal-wall-thickness structure and is vertical to the flange section (1);

the conical section (3) is of a conical structure with equal wall thickness and is in smooth transition connection with the convex spigot section (2) and the flange section (1);

the stage (4) is a revolving body, the inner surface is an end surface, and the outer surface is a short end surface plus a conical surface; one end of the platform stage (4) is of a one-stage ladder structure, and the other end of the platform stage is in smooth transition connection with the conical section (3);

the flange section (1), the convex spigot section (2), the conical section (3) and the platform section (4) are all made of continuous fiber reinforced composite materials and are integrally formed by adopting an additive manufacturing process, and all the parts are connected in a smooth transition mode.

2. The composite material stationary housing for a nozzle of claim 1, wherein: the raw materials used for the composite material fixing shell for the spray pipe are carbon fibers and thermoplastic resin.

Technical Field

The present invention relates to a 3D printed (also referred to as "additive manufacturing") composite material load bearing structure, and in particular to a fixed shell structure for a solid rocket engine nozzle.

Background

Additive manufacturing techniques have been partially implemented in batch applications in the fields of biomedical, transportation, aerospace, industrial equipment, electronic products, and the like. The continuous fiber reinforced composite material is widely applied to parts such as shells, cabin sections and head covers of missile weapons by virtue of excellent performance of the continuous fiber reinforced composite material. The structural mass of the spray pipe directly influences the range and carrying capacity of a missile weapon, the fixed shell is used as the most core bearing component of the spray pipe, the load environment is severe, the existing materials are mainly alloy steel or titanium alloy, and the mass of the existing materials accounts for about 20%.

Disclosure of Invention

The invention aims to solve the technical problem of providing a composite material fixing shell for a spray pipe based on 3D printing, and aims to solve the problems of reducing the structural quality of the spray pipe, shortening the manufacturing period and improving the mass ratio of a solid rocket engine.

In order to solve the existing technical problems, the technical scheme adopted by the invention is as follows: a composite material fixing shell for a spray pipe based on 3D printing is divided into a flange section, a male spigot section, a conical section and a step section, wherein the flange section is of a cylindrical structure with equal wall thickness, and a plurality of round holes are uniformly distributed on the end face in the circumferential direction; the convex spigot section is of a short cylinder structure with equal wall thickness and is vertical to the flange section; the conical section is of a conical equal-wall-thickness structure and is in smooth transition connection with the male spigot section and the flange section; the stage is a revolving body, the inner surface is an end surface, and the outer surface is a short end surface plus a conical surface; one end of the step section is of a one-stage step structure, and the other end of the step section is in smooth transition connection with the conical section; the flange section, the convex spigot section, the conical section and the step section are all made of continuous fiber reinforced composite materials and are integrally formed by adopting an additive manufacturing process, and all the parts are connected in a smooth transition mode.

The composite material fixing shell for the spray pipe based on 3D printing has a short manufacturing period, and the mass ratio of an engine is increased. The fixed shell is made of a continuous fiber reinforced composite material, the raw materials are carbon fiber and thermoplastic resin, and the fixed shell does not contain any metal material; the molding mode of additive manufacturing is adopted, and the composite material belongs to an integral composite material structure based on continuous fiber reinforcement. As the main bearing component of the engine spray pipe, the strength requirement and the rigidity requirement of the spray pipe can be met, the structural quality of the spray pipe is reduced, the manufacturing period is shortened, an advanced technical approach is provided for improving the performance and the research and development efficiency of an engine, and the solid power technology is supported to be upgraded and updated.

Advantageous effects

The method has the advantages that the characteristic that the continuous fiber reinforced composite material additive manufacturing technology can realize the integrated forming of the parts with complex structures is utilized, the forming of the 3D printing composite material fixing shell is realized, the structural quality of the spray pipe is reduced, the mass ratio of the engine is improved, and the method has important significance for supporting future upgrading and upgrading of missile weapons.

The composite material fixing shell for the spray pipe based on 3D printing has the advantages of wider application range, stronger designability and lighter structural mass; by adopting a continuous fiber reinforcement process, the structural integrity is better, and the bearing capacity is stronger; 3D printing is adopted, the manufacturing period is shorter, the utilization rate of raw materials is higher, and a more engineered technical approach is provided for reducing the structural quality of the spray pipe. The expansion nozzle can be popularized and applied to the expansion section shell of the nozzle, and the technical inheritance is higher.

Drawings

FIG. 1 is a front view of the present invention;

FIG. 2 is a right side view of the present invention;

FIG. 3 is an enlarged view of a portion of FIG. 2 at I;

the labels in the figure are: 1-flange section, 2-convex spigot section, 3-cone section and 4-step section.

Detailed Description

The invention is further described with reference to the following figures and specific embodiments.

As shown in the attached drawing 1, the composite material fixing shell for the spray pipe based on 3D printing is composed of a flange section 1, a convex spigot section 2, a conical section 3 and a step section 4.

As shown in attached figures 2 and 3, the flange section 1 is a cylindrical structure with equal wall thickness, and a plurality of round holes are uniformly distributed on the end surface in the circumferential direction;

the wall thickness, the number of end face round holes, the aperture and the diameter of the distribution circle of the flange section 1 can be adjusted adaptively according to index requirements.

The male end section 2 is a short cylinder with the same wall thickness and is vertical to one end of the flange section at 90 degrees;

the conical section 3 is of a conical structure with equal wall thickness and is in smooth transition connection with the male end section and the flange section;

stage 4 is a solid of revolution, with the inner surface being the end face and the outer surface being the short end face plus the conical surface. One end of the platform stage 4 is of a primary ladder structure, and the other end of the platform stage is in smooth transition connection with the conical section; stage 4 can be adjusted according to the overall nozzle structure needs.

The wall thickness and the cone angle of the cone section 3 and the chamfer angle connected and transited with the male end section 2 and the step section 4 can be adjusted;

the flange section 1, the convex spigot section 2, the conical section 3 and the step section 4 are all made of continuous fiber reinforced composite materials and are integrally formed by adopting an additive manufacturing process, four parts of structures are connected in a smooth transition mode, and the wall thickness and the shape can be adjusted according to different engine combustion chamber parameters and spray pipe structures.

The fixed shell structure disclosed by the invention realizes full-composite material by utilizing a 3D printing process, and can meet the bearing requirement of the spray pipe.

The fixed shell product of the invention has the actually measured structure mass of 1.41kg, and is converted intoBulk density of about 1.63g/cm³. Through finite element simulation analysis and routine hydraulic test verification and examination of the spray pipe, the structure is complete after the test, the bearing capacity is reliable, and the feasibility is proved.