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Contraction-expansion nozzle, manufacturing method thereof, additive manufacturing equipment and method

A technology of additive manufacturing and nozzles, which is applied in the field of cold spray additive manufacturing, can solve the problems of limited material types, poor material performance, and high cost, and achieve simple process, improved hardness and corrosion resistance, and good material performance. Effect

Pending Publication Date: 2022-07-29
GUANGDONG INST OF NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the processing of complex nozzles, especially deep hole processing, has always been a difficult point in the machinery industry. Deep hole parts prepared by machining methods have a small processing depth and cannot process complex parts, such as bell-shaped nozzles.
However, the preparation of traditional contraction-expansion nozzles, such as carbide nozzles, adopts hot isostatic pressing, sintering molding, and casting molds. The price is high, and the material performance is still not good.
Using 3D printing additive manufacturing method to design parts can well meet the design and preparation of complex internal structures. However, common additive manufacturing methods such as laser selective area scanning still have high heat input, slow preparation speed, and easy to change the physical and chemical properties of raw materials. nature, the types of materials are limited (such as the inability to prepare ceramic materials), and it has the characteristics of high cost and difficult processing.

Method used

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  • Contraction-expansion nozzle, manufacturing method thereof, additive manufacturing equipment and method
  • Contraction-expansion nozzle, manufacturing method thereof, additive manufacturing equipment and method
  • Contraction-expansion nozzle, manufacturing method thereof, additive manufacturing equipment and method

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preparation example Construction

[0020] Some embodiments of the present invention provide a method for preparing a shrink-expand nozzle, which includes: adopting a cold spray method on a rotary shaft base for additive manufacturing of a shrink-expand nozzle required for additive manufacturing, wherein the pressure used for the cold spray is 2MPa~5MPa; use physical method or chemical method to remove the base of the rotating shaft.

[0021] Cold spraying is a kind of rapid prototyping technology. Its main principle is to heat solid powder particles (below the melting temperature) and accelerate them to supersonic speed to collide with the matrix, and then deposit and form a coating through strong plastic deformation. Compared with traditional thermal spraying, this technology does not need to melt the sprayed metal powder particles, so there is no physical and chemical reaction involved in the whole process, and it is a solid-state additive preparation technology. Cold spraying can spray a variety of materials...

Embodiment 1

[0048] The present embodiment provides a method for preparing a contraction-expansion nozzle, which specifically includes:

[0049] Select the base of the rotating shaft made of pure iron. The base of the rotating shaft is prepared by casting. The base of the rotating shaft is as follows: figure 1 shown.

[0050] The intermediate layer is prepared by cold spraying. The material of the intermediate layer is pure aluminum. The corresponding process parameters are: the spraying gas is nitrogen, the spraying pressure is 3.5MPa, the spraying temperature is 500℃, the powder feeding rate is 50g / min, and the nozzle scans The speed is 300mm / s, and the distance from the nozzle to the surface to be sprayed is 35mm.

[0051] After the preparation of the intermediate layer, copper was used as the shrink-expanding nozzle material, and the shrink-expanding nozzle was prepared by cold spraying. The amount of powder is 100g / min, the scanning speed of the nozzle is 400mm / s, and the distance f...

Embodiment 2

[0055] The present embodiment provides a method for preparing a contraction-expansion nozzle, which specifically includes:

[0056] The rotating shaft base of pure aluminum material is selected. The rotating shaft base is prepared by casting. The rotating shaft base is as follows: figure 2 The bell-shaped, rotating shaft base shown is made of pure aluminum.

[0057] The intermediate layer is prepared by cold spraying. The material of the intermediate layer is pure aluminum. The corresponding process parameters are: the spraying gas is nitrogen, the spraying pressure is 4.5MPa, the spraying temperature is 450℃, the powder feeding rate is 60g / min, and the nozzle scans The speed is 350mm / s, and the distance from the nozzle to the surface to be sprayed is 30mm.

[0058] After the preparation of the intermediate layer, the shrink-expansion nozzle is made of tungsten carbide-nickel mixed powder material (the mixing ratio is 50:50 vol.%), and the shrink-expansion nozzle is prepared...

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Abstract

The invention discloses a shrinkage-expansion nozzle and a preparation method thereof and additive manufacturing equipment and method.The preparation method of the shrinkage-expansion nozzle comprises the steps that the required shrinkage-expansion nozzle is manufactured on a rotating shaft base body in an additive mode through a cold spraying method, and the pressure adopted for cold spraying ranges from 2 MPa to 5 MPa; and removing the rotating shaft substrate by adopting a physical method or a chemical method. The shrinkage-expansion nozzle with the complex inner wall shape is manufactured on the surface of the rotating shaft base body in a cold spraying mode, then the rotating shaft base body is removed, the whole process is simple, the shrinkage-expansion nozzle with the compact structure can be generated under the action of large pressure through additive manufacturing on the surface of the rotating shaft base body, and the shrinkage-expansion nozzle with the compact structure is formed. The material is good in performance, and the strength, hardness, corrosion resistance and the like are improved.

Description

technical field [0001] The invention relates to the technical field of cold spraying additive manufacturing, in particular, to a shrink-expanding nozzle and a preparation method thereof, and additive manufacturing equipment and method. Background technique [0002] The contraction-expanding nozzle is the core component of cold spray technology, which plays the role of accelerating metal powder to supersonic flight state. The shape of the nozzle directly affects the acceleration performance of the particles, such as the length of the diverging section, the outlet / throat diameter ratio, etc. Simulations show that the bell-shaped nozzle has the best acceleration performance for particles. During the use of the nozzle, the inner wall of the nozzle directly collides and reacts with the high-temperature and high-speed metal powder, which is prone to wear and corrosion failure. It is a typical cold spraying consumable. [0003] At present, the machining of complex nozzles, especi...

Claims

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Application Information

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IPC IPC(8): B22F10/10B22F10/38B22F10/40B22F12/53B33Y10/00B33Y30/00B33Y80/00B33Y40/20
CPCB22F10/10B22F10/38B22F10/40B22F12/53B33Y10/00B33Y30/00B33Y80/00B33Y40/20
Inventor 褚欣兰海明孙文谢迎春张科杰王高民曾良黄仁忠
Owner GUANGDONG INST OF NEW MATERIALS
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