TWM604249U - Multi-beam coaxial laser cladding device - Google Patents

Abstract

This creation provides a multi-beam coaxial laser thawing device, which can be applied to the multilayer manufacturing auxiliary system. By adding multiple laser beams outside the laser tool head in the laser processing system, the laser beam can be started in segments, The demand for laser spot size expansion. When the main laser beam is turned on and scanning moves, the material to be processed can be synchronized to achieve preheating, heat source expansion and improve the quality of laminated products. The multi-beam laser structure is a laser melting nozzle formed by the main beam combined with an auxiliary beam. The laser processing uses the auxiliary beam to increase the melting efficiency to realize a laser processing head with flexible controllable input.

Description

Multi-beam coaxial laser melting device

This creation is related to the field of laser application, especially a multi-beam coaxial laser thawing device that can be used in the manufacture of laminated materials.

With the advent of smart manufacturing and digital entity conversion technology, in order to meet the prerequisite of green environmental protection, there is an urgent need to upgrade the current traditional manufacturing mode. The reason lies in the field of molds, automobiles, and aviation. A large number of components are used, and these components are frequently used, causing the components to be easily damaged by abrasion/corrosion, and reducing the service life of the components. On the other hand, the above-mentioned components are often complicated in geometry, cumbersome and time-consuming. Therefore, in order to solve the above problems, the technology of repairing and remanufacturing the surface wear and the technology of rapid stacking of components is extremely important. Space for development.

Because the laser processing system is used in repair and remanufacturing and rapid build-up manufacturing, whether it is the use of equipment or process gas, compared with hot/cold spraying, the repairable area, the repairable depth of the part and the surface treatment of the inner hole are compared. , Its application and cost considerations are more advantageous than hot/cold spraying. So far, it can be used whether it is metal materials or ceramic materials, especially for the modification of the surface of the material to improve or increase the wear resistance, corrosion resistance or high temperature oxidation resistance of the material surface.

However, cracks and voids are the most common defects in laser repair remanufacturing and rapid build-up manufacturing. The main reason for the formation of these deficiencies comes from the inability to accurately control the metallurgical chemical reaction and solidification behavior of metallurgical materials from high temperature to normal temperature.

During the manufacturing process, solidification cracks, also known as crystallization cracks, occur in the late stage of the metal solidification process. When the metal material has grown from nucleation, grain growth, to passing through the grain boundary, until the final crystallization is almost complete, at the same time, there is still a thin liquid layer between the grains, which has low fluidity and low plasticity. Once, the cooling process The medium temperature distribution is not uniform. When the material condenses and shrinks and the tensile deformation exceeds the critical value, the cracks will crack along the liquid layer near the grain boundary. This kind of cracks mostly originate from the final junction of dendrites and extend along the intercrystalline. In severe cases, the cracks will extend to the surface of the cladding layer, especially containing more sulfur and phosphorus (sometimes containing silicon and carbon). Among the carbon steel materials, such as high-carbon steel, heat-resistant steel, nickel-based alloys and aluminum alloys, solidification cracks are particularly prone to appear in the weld.

On the other hand, in laser multilayer manufacturing, the focal distance of the laser determines the size of the laser spot, and the spot size determines the size of the molten pool. Therefore, in order to obtain a sufficiently large spot size, the focal position is often The defocusing state, and because of the energy density of the laser acting on the surface of the material and the yield rate of the powder material during the cladding process largely depend on the spot size, therefore, in order to obtain a good quality cladding layer, high-powered Laser source can be realized.

In order to solve the above-mentioned common deficiencies in the laser layer manufacturing process, based on years of experience, our team conceived a device for applying a multi-beam laser cladding processing head to a layered manufacturing auxiliary system. The auxiliary laser beam is assisted by the bracket mechanism to align the auxiliary laser beam to the main laser beam spot, effectively solving the laser spot size, the molten pool is small, and a relatively uniform temperature range of the molten pool is provided to melt the material When entering the molten pool, it can be effectively melted and combined to further increase the yield.

One of the purposes of this creation is to provide a laser thawing device to increase the spot size, so that when the fused powder material enters the molten pool, the yield rate can be more effectively increased. With the uniform and stable temperature distribution characteristics, the The cladding coating has high uniformity production quality.

In order to achieve the above purpose, this creation system discloses a multi-beam coaxial laser thawing device for laser thawing processing of an object to be processed, including: a main laser beam with an inner nozzle on one side, The inner nozzle is supplied with the main laser beam to emit the laser to form a main spot; an outer nozzle is arranged on the side of the inner nozzle relative to the position of the inner nozzle to form a coaxial arrangement, and the outer nozzle provides a shield Gas; A plurality of auxiliary laser beams are arranged around the side of the main laser beam, and the auxiliary laser beams emit the laser to form a primary spot; wherein, the main spot and the secondary spot are superimposed A fusion spot is formed; and a powder flow channel is formed by ringing on the side of the inner nozzle relative to the position of the inner nozzle to form a coaxial arrangement, and the powder flow channel provides a fusion powder to the fusion spot. A cladding coating is formed in a molten pool; wherein the powder flow channel is coaxially arranged with the inner nozzle and the outer nozzle, and the powder flow channel is between the inner nozzle and the outer nozzle to supply the melt Covered with powder.

Preferably, the auxiliary laser beams are arranged at equal intervals.

Preferably, the secondary spot is connected to the periphery of the main spot to overlap to form the fusion spot.

In order for your reviewer to have a clear understanding of the content of this creation, please refer to the following descriptions and diagrams. The performance shown in each figure is only a schematic diagram for explaining the technical characteristics of the case, and does not mean that the creation can only be implemented in these ways. Please refer to Figures 1 to 4, which are schematic diagrams of the action and device of each preferred embodiment of the creation.

Among them, this creation system discloses a multi-beam coaxial laser thawing device for laser thawing processing of an object 9 to be processed. The laser thawing device includes a main laser beam 10 and an outer laser beam. The nozzle 12, a plurality of auxiliary laser beams 20 and a powder flow channel 30. The main laser beam 10 is provided with an inner nozzle 11 on one side, and the inner nozzle 11 is used for the main laser beam 10 to emit a laser to form a main spot 101. The outer nozzle 12 is arranged on the side of the inner nozzle 11 relative to the inner nozzle 11 to form a coaxial arrangement. The outer nozzle 12 is provided with a shielding gas 120. The auxiliary laser beams 20 are arranged around the side of the main laser beam 10, and the auxiliary laser beams 20 can be used to form a primary spot 201.

Further, the setting angle of the main spot 101 and the secondary spot 201 can be such that the two overlap to form a fusion spot 40. Accordingly, the fusion spot 40 has better uniform and stable temperature distribution characteristics, and the size and area of the fusion spot is also larger than the traditional fusion range, thereby increasing the yield. In addition, the powder flow channel 30 is arranged on the side of the inner nozzle 11 relative to the inner nozzle 11 to form a coaxial arrangement, and the powder flow channel 30 provides a fusion powder 301 to the fusion spot 40 formed A molten pool 302 forms a cladding coating 303. The powder flow passage 30 is coaxially arranged with the inner nozzle 11 and the outer nozzle 12, and the powder flow passage 30 is between the inner nozzle 11 and the outer nozzle 12 to supply the fused powder 301. Because the side-axis powder feeding is pneumatically sent to the spot, the side-axis powder feeding can be divided into two types: asymmetric side powder feeding and symmetric coaxial powder feeding. The side powder feeding is easily affected by the direction of movement and melts The quality is relatively poor; the coaxial powder feeding and melting coating has good quality and strong versatility. In other words, the coaxial design of this invention can be easily understood as a circular-shaped outlet structure, and the coaxial feeding method can be used to achieve a better laser fusion effect.

Further, in order to make the secondary spot 201 formed by the auxiliary laser beams 20 and the main spot 101 have a better overlapping effect, the auxiliary laser beams 20 are arranged at equal intervals, with a circle of 360 degrees. In other words, three of the auxiliary laser beams 20 are arranged at an angle of about 120 degrees between each other; four auxiliary laser beams 20 are arranged at an angle of about 90 degrees between each other. , And so on.

Furthermore, since increasing the size of the fusion spot 40 can increase the yield, based on this consideration, the secondary spot 201 can be connected to the periphery of the main spot 101 to overlap to form the entire range of the fusion spot 40. In this way, the range of the molten pool 302 that the fusion spot 40 can generate correspondingly can also be greatly increased. When the cladding powder 201 enters the range of the molten pool 302, the yield can be effectively increased.

To sum up, the multi-beam coaxial laser thawing device created by this invention can be applied to the multilayer manufacturing auxiliary system. The laser beam can be realized by adding multiple laser beams outside the laser tool head in the laser processing system. The demand for segmented start and enlargement of the laser spot size. When the main laser beam is turned on and scanning moves, the material to be processed can be synchronized to achieve preheating, heat source expansion and improve the quality of laminated products. According to this, the laser processing head with flexible controllable input can effectively increase the spot size, and promote the melting of powder materials into the molten pool to more effectively increase the material yield. With the uniform and stable temperature distribution characteristics, the melting The coating has high uniformity production quality.

The above are only the preferred embodiments of this creation, and are not used to limit the scope of rights of this creation; therefore, changes, modifications, or replacements of elements with the same function made without departing from the equal scope of this creation are still All should be covered in the scope of the patent of this creation.

10: Main laser beam 11: Inner nozzle 101: Main spot 12: Outer nozzle 120: shielding gas 20: auxiliary laser beam 201: secondary spot 30: powder runner 301: Melting powder 302: Weld Pool 303: Melting coating 40: Melting spot 9: Object to be processed

Figure 1 is a schematic diagram of the action of a preferred embodiment of creation. Figure 2 is a schematic diagram of the action of another preferred embodiment of the creation. Figure 3 is a schematic diagram of the action of another preferred embodiment of the creation. Figure 4 is a schematic diagram of a device for creating a preferred embodiment.

10: Main laser beam

11: Inner nozzle

12: Outer nozzle

20: auxiliary laser beam

30: powder runner

Claims (3)

A multi-beam coaxial laser thawing device for laser thawing processing of an object to be processed, comprising: A main laser beam, provided with an inner nozzle on one side, the inner nozzle is used for the main laser beam to emit a laser to form a main spot; An outer nozzle is arranged on the side of the inner nozzle relative to the position of the inner nozzle to form a coaxial arrangement, and the outer nozzle is provided with a shielding gas; A plurality of auxiliary laser beams are arranged around the side of the main laser beam, and the auxiliary laser beams emit the laser to form a primary spot; wherein, the main spot and the secondary spot are superimposed to form a Melting spot; and A powder flow path is arranged on the side of the inner nozzle relative to the position of the inner nozzle to form a coaxial arrangement, and the powder flow path provides a molten powder to a molten pool to form a molten coating; wherein the powder flow The channel is coaxially arranged with the inner nozzle and the outer nozzle, and the powder flow channel is between the inner nozzle and the outer nozzle to supply the fused powder. The multi-beam coaxial laser thawing device according to claim 1, wherein the auxiliary laser beams are arranged at equal intervals. The multi-beam coaxial laser fusion device according to claim 2, wherein the secondary spot is connected to the periphery of the main spot and overlaps to form the fusion spot.

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