TWM604248U - Coaxial laser cladding device with assisting beam - Google Patents

Abstract

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

Description

Coaxial laser thawing device with auxiliary beam

This creation is related to the field of laser application, especially a coaxial laser thawing device with auxiliary beam 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 and environmental protection, it is urgent to upgrade the current traditional manufacturing model. 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 complex in geometry, cumbersome and time-consuming. Therefore, in order to solve the above-mentioned problems, the technology of repairing and remanufacturing surface abrasion and rapid stacking of components has great advantages. Space for development.

Since 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 to hot/cold spraying for repairable area, repairable depth of parts and surface treatment of inner holes , Its application and cost considerations are more advantageous than hot/cold spraying. So far, it can be used whether it is metal material or ceramic material, especially for modifying 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 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 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 confluence of dendrites and expand along the intergranular. 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 at 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 fused 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-mentioned purpose, this creation is to disclose a coaxial laser thawing device with auxiliary beams for laser thawing processing of an object to be processed, including: a thawing head body with an inner nozzle and a An outer nozzle, wherein the inner nozzle is used for a main laser beam to emit a laser to form a main spot; the outer nozzle is arranged coaxially around the inner nozzle to provide a shielding gas; a plurality of brackets are respectively An auxiliary laser beam is provided. The brackets are arranged around the side of the fusion head body, so that the auxiliary laser beams are arranged around the main laser beam, and the auxiliary laser beams are provided to form A primary spot; wherein the main spot and the secondary spot are superimposed to form a fusion spot; and a powder flow channel 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 The channel provides a fusion coating powder to a molten pool formed in the fusion spot to form a fusion coating; wherein the powder flow channel is coaxially arranged with the inner nozzle and the outer nozzle, and the powder flow channel is between The fusion coating powder is supplied between the inner nozzle and the outer nozzle, and the brackets can move relative to the fusion coating head body.

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

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

Preferably, the fused powder is fused relative to the fusion spot in an asymmetric side powder feeding mode; or the fused powder is fused relative to the fusion spot in a symmetric coaxial powder feeding mode.

Preferably, the laser thawing device further has a base for placing the object to be processed, and the brackets are movable and form an angle of 60 to 80 degrees with respect to the base. Preferably, the brackets are movable and form a distance of 100-180 mm from the base.

In order for your reviewers 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 features of the case, and does not mean that this 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 is to disclose a coaxial laser thawing device with auxiliary beams for laser thawing processing of an object 9 to be processed, wherein the laser thawing device includes a fusion head body 1, A plurality of supports 2 and a powder flow channel 30. The cladding head body 1 is provided with an inner nozzle 11 and an outer nozzle 12. The inner nozzle 11 can be used for a main laser beam 10 to emit a laser to form a main spot 101; the outer nozzle 12 is opposite to the inner nozzle 11 The nozzle 11 is coaxially arranged around the nozzle to provide a shielding gas 120. The brackets 2 are respectively provided with an auxiliary laser beam 20, and the brackets 2 are arranged around the side of the fusion head body 1, so that the auxiliary laser beam 20 is arranged around the main laser beam 10. And the auxiliary laser beams 20 can be used to form the 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 material yield. In addition, the powder flow channel 30 is arranged on one side of the main laser beam 10, and the powder flow channel 30 provides a fusion powder 301 to the fusion spot 40 to form a molten pool 302. In addition, in order to increase the flexibility of laser processing with controllable input, the brackets 2 can move relative to the fusion head body 1. In addition, the powder flow channel 30 is arranged on the side of the inner nozzle 11 relative to the position of the inner nozzle 11 to form a coaxial arrangement, and the powder flow channel 30 provides the fusion powder 301 to the molten pool 302 to form a fusion coating层303。 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 the present creation can be easily understood as a ring-shaped outlet structure, and the coaxial feeding method can be used to achieve a better laser melting 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 and then overlap to form the entire range of the fusion spot 40. In this way, the melting spot 40 greatly increases the range of the molten pool 302 that can be generated accordingly, and when the melting powder 201 enters the range of the molten pool 302, the material yield can be effectively increased.

Furthermore, in order to enhance the flexibility of laser processing with controllable input, the laser thawing device further has a base 5 for placing the object 9 to be processed, and the brackets 2 are movable relative to the base. The seat 5 forms an included angle of 60 to 80 degrees. Preferably, the brackets 2 are movable and form a distance of 100-180 mm with the base 5 respectively. Through the aforementioned changes in angle and distance, the size of the fusion spot 40 and the temperature distribution of the molten pool 302 can be adjusted flexibly. According to this, the laser fusion process can be effectively realized for different laminated materials and the fusion powder 301. effect.

To sum up, the coaxial laser thawing device with auxiliary beam can be applied to the auxiliary system of multi-layer manufacturing. By adding multiple laser beams outside the laser tool head in the laser processing system to achieve laser The beam segment starts and the laser spot size is expanded. 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.

1: Melting head body 10: Main laser beam 11: Inner nozzle 101: Main spot 12: Outer nozzle 120: shielding gas 2: bracket 20: auxiliary laser beam 201: secondary spot 30: powder runner 301: Melting powder 302: Weld Pool 303: Melting coating 40: Melting spot 5: Pedestal 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.

1: Melting head body

10: Main laser beam

11: Inner nozzle

12: Outer nozzle

2: bracket

20: auxiliary laser beam

30: powder runner

5: Pedestal

Claims (5)

A coaxial laser thawing device with auxiliary beam for laser thawing processing of an object to be processed, including: A cladding head body has an inner nozzle and an outer nozzle, wherein the inner nozzle can be used for a main laser beam to emit a laser to form a main spot; the outer nozzle is arranged coaxially around the inner nozzle. To provide a shielding gas; A plurality of brackets are respectively provided with an auxiliary laser beam, and the brackets are arranged around the side of the fusion head body, so that the auxiliary laser beams are arranged around the main laser beam, and the auxiliary laser beams are arranged around the main laser beam. The laser beam is used to form a primary spot; wherein the main spot and the secondary spot are superimposed to form a fusion 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, the inner nozzle and the outer nozzle are coaxially arranged, the powder flow channel is between the inner nozzle and the outer nozzle to supply the fusion powder, and the brackets can move relative to the fusion head body. The coaxial laser thawing device with auxiliary beams according to claim 1, wherein the auxiliary laser beams are arranged at equal intervals. The coaxial laser fusion device with auxiliary beam according to claim 2, wherein the secondary spot is connected to the periphery of the main spot and overlaps to form the fusion spot. For example, the coaxial laser thawing device with auxiliary beam described in any one of claims 1 to 3 has a base for placing the object to be processed, and the brackets are movable relative to the The base forms an angle of 60 to 80 degrees. The coaxial laser thawing device with auxiliary beam according to claim 4, wherein the brackets are movable and form a distance of 100-180 mm from the base.

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