CN201511130U - A coaxial powder feeding nozzle for laser rapid prototyping - Google Patents

Abstract

A coaxial powder feeding nozzle for laser rapid prototyping, comprising a cooling water cover, a cone nozzle sleeve, an inner cone nozzle, a powder inlet sleeve and a water inlet pipe. The taper mouth sleeve is in the cooling water cover, and the water inlet pipe is inserted into the cooling water cover. The cavity between the cooling water cover and the cone nozzle sleeve is the outer cooling water channel. The cooling water cover and the cone mouth sleeve are connected by a thread structure, and sealing rings are respectively provided at the upper and lower joint surfaces. The inner cone mouth and the powder inlet sleeve are in the cone mouth sleeve. The inner cone nozzle and the powder inlet sleeve are connected by threads, the inner cone nozzle is inside, the powder inlet sleeve is outside, the cavity between the inner cone nozzle and the powder inlet sleeve is the inner cooling water channel, the inner cone nozzle and the powder inlet sleeve There are sealing rings respectively on the two joint surfaces of the sleeve. The outer surface of the inner cone mouth is a conical surface, and there are 4 or 6 groove structures uniformly formed on this surface. The centerlines of the groove structures meet at one point, and this intersection coincides with the laser focus spot. The utility model has good sealing and cooling, the powder outlet does not stick to the powder, improves the convergence and spray speed of the powder, and the main connection method is threaded connection, which is not only easy to process, convenient to assemble and disassemble, but also overcomes the large heat input of the welding connection. Disadvantages of large changes in parts.

Description

A coaxial powder feeding nozzle for laser rapid prototyping

Technical field: The utility model relates to a powder feeding nozzle, especially a coaxial powder feeding nozzle for laser rapid prototyping, which is mainly used in metal powder laser rapid prototyping systems and laser surface cladding systems.

Background technology: Laser is the most promising field in the 20th century. More than 20 kinds of laser processing technologies have been developed abroad, among which laser cladding technology is currently one of the most active laser processing technologies. Laser rapid prototyping technology is a combination of laser cladding technology and rapid prototyping technology, using metal powder as raw material, using high-power laser cladding technology, and using rapid prototyping layered manufacturing ideas to manufacture metal functional parts. This technology has attracted people's attention because of its ability to directly form metal functional parts, and has made great progress. In addition to high-power lasers, the laser rapid prototyping system mainly includes light guide and focusing devices, numerical control devices and metal powder feeding devices, among which metal powder feeding is a key technology, which directly affects the laser surface cladding and Quality and efficiency in laser rapid prototyping. At present, there are three main methods of metal powder feeding: preset powder method, side synchronous powder feeding method and coaxial powder feeding method. At present, the coaxial powder nozzles using the coaxial powder feeding method are used more, and most of the coaxial powder nozzles adopt the structure of the coaxial annular cone sleeve. Although this coaxial powder nozzle has a compact structure, it still has the following problems:

1. Poor powder convergence: the existing ring-shaped cone sleeve structure has powder sprayed out on the entire circumference, and it is difficult to realize powder convergence into the molten pool of laser cladding or laser rapid prototyping.

2. Low powder utilization rate: Because the coaxial powder feeding nozzle with the existing annular cone sleeve structure has poor powder aggregation, it directly leads to low powder utilization rate, which leads to increased processing costs.

3. Difficult processing: most of the existing coaxial powder feeding nozzles adopt welding structure, which leads to large heat input in welding processing, large deformation of the workpiece, and low yield, resulting in difficult processing.

Summary of the invention: In view of the shortcomings of the above-mentioned prior art, the utility model provides a coaxial powder feeding nozzle for laser rapid prototyping.

In order to achieve the above purpose, the technical solution adopted by the utility model is: a coaxial powder feeding nozzle for laser rapid prototyping, including a cooling water cover, a cone nozzle sleeve, an inner cone nozzle, a powder inlet sleeve and a water inlet pipe. The taper mouth sleeve is in the cooling water cover, and the water inlet pipe is inserted into the cooling water cover. The cavity between the cooling water cover and the cone nozzle sleeve is the outer cooling water channel. The cooling water cover and the cone mouth sleeve are connected by a thread structure, and sealing rings are respectively provided at the upper and lower joint surfaces. The inner cone mouth and the powder inlet sleeve are in the cone mouth sleeve. The inner cone nozzle and the powder inlet sleeve are connected by threads, the inner cone nozzle is inside, the powder inlet sleeve is outside, the cavity between the inner cone nozzle and the powder inlet sleeve is the inner cooling water channel, the inner cone nozzle and the powder inlet sleeve There are sealing rings respectively on the two joint surfaces of the sleeve. The outer surface of the inner cone mouth is a conical surface, and there are 4 groove structures (with a difference of 90 degrees for each groove) or 6 groove structures (with a difference of 60 degrees for each groove) evenly formed on this surface, and the center lines of the groove structures meet Intersect at one point, and this intersection coincides with the laser focus spot.

The utility model has good sealing and cooling, and the powder outlet does not stick to the powder, which improves the convergence and spraying speed of the powder, and the main connection method is threaded connection, which is easy to process, convenient to assemble and disassemble, and overcomes the large heat input of the welding connection. Disadvantages of large changes in parts.

Description of drawings:

Fig. 1 is an internal sectional view of the utility model.

Fig. 2 is a schematic diagram of the structure of the inner cone mouth.

FIG. 3 is a bottom view of FIG. 2 .

Detailed ways:

As shown in Figure 1: a coaxial powder feeding nozzle for laser rapid prototyping, including a cooling water cover 1, a cone nozzle sleeve 2, an inner cone nozzle 3, a powder inlet sleeve 4 and a water inlet pipe 5. The cone mouth cover 2 is in the cooling water cover 1, and the water inlet pipe 5 is inserted into the cooling water cover 1. The cavity between the cooling water cover 1 and the nozzle sleeve 2 is the outer cooling water channel 7, which can take away most of the heat reflected to the powder feeding nozzle during laser surface cladding and laser rapid prototyping. The cooling water cover 1 and the cone mouth sleeve 2 are connected by a threaded structure, and sealing rings are respectively provided on the upper and lower joint surfaces to ensure the reliable sealing of this structure. The cooling water cover 1 is threadedly connected with the water inlet and outlet pipes 5. When connecting, the surface of the thread is coated with sealant, and then the thread is tightened to ensure reliable connection and reliable sealing. The inner cone mouth 3 and the powder inlet sleeve 4 are in the cone mouth sleeve 2 . The inner cone nozzle 3 and the powder inlet sleeve 4 are connected by threads, the inner cone nozzle 3 is inside, the powder inlet sleeve 4 is outside, and the cavity between the inner cone nozzle 3 and the powder inlet sleeve 4 is the inner layer cooling water channel 6, This structure keeps the temperature of the powder feeding channel in a low range so that the powder outlet does not stick to the powder. There are sealing rings on the two joint surfaces of the inner cone mouth 3 and the powder inlet sleeve 4 to ensure the safety of this structure. The seal is reliable.

As shown in Figure 2 and Figure 3: the outer surface of the inner cone nozzle 3 is a conical surface, and there are 4 (each groove differs by 90 degrees) or 6 grooves (each groove differs by 60 degrees) evenly on this surface type structure. The powder is ejected from 4 (6) slots, which has the following advantages: 1. Compared with the existing ring-conical surface ejection, the aggregation of the powder is improved. 2. The area of the slot hole is smaller than the area of the ring hole. Under the condition of the carrier gas pressure and the carrier gas flow rate unchanged, the powder injection speed is increased and the convergence is improved. 3. The higher spray speed also makes it difficult for the powder to stick to the powder outlet. The inner cone mouth 3 is a hollow structure, which is a focused laser channel, and an inert gas is passed inside, which not only protects the lens from cleaning, but also keeps the laser melting pool within the protection range of the inert gas. 4. Higher outlet air velocity and higher outlet pressure can spray unmelted powder away, making the surface quality of laser cladding and laser rapid prototyping higher.

Claims (2)

1. A coaxial powder feeding nozzle for laser rapid prototyping, characterized in that: it includes a cooling water cover, a cone nozzle cover, an inner cone nozzle, a powder inlet sleeve and a water inlet pipe; the cone nozzle cover is in the cooling water cover, and the inlet The water pipe is inserted into the cooling water cover; the cavity between the cooling water cover and the cone nozzle sleeve is the outer cooling water channel, and the cooling water cover and the cone nozzle sleeve are connected by a thread structure. There is a sealing ring, the inner cone nozzle and the powder inlet sleeve are in the cone nozzle sleeve, the inner cone nozzle and the powder inlet sleeve are connected by threads, the inner cone nozzle is inside, the powder inlet sleeve is outside, and the inner cone nozzle and the powder inlet sleeve are connected The cavity of the inner layer is the cooling water channel, and there are sealing rings on the two joint surfaces of the inner cone nozzle and the powder inlet sleeve respectively; The centerlines of the type structure meet at one point, and this intersection coincides with the laser focus spot. 2. A coaxial powder feeding nozzle for laser rapid prototyping according to claim 1, characterized in that: there are 4 or 6 groove structures.

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