CN205024324U - Supplementary laser cladding device of steady magnetic field - Google Patents

Abstract

The utility model discloses a stable and constant magnetic field assisted laser cladding device, which belongs to the technical field of surface modification. The device includes a cooler, a CNC console, a CNC machine tool, a sample fixture, a magnetic field generator, a DC power supply, a synchronous powder feeder, and an air storage tank. Coolers, lasers, CNC machine tools and synchronous powder feeders are all controlled by the CNC console. In addition, the cooler is connected to the laser, and the synchronous powder feeder is connected to the gas storage tank, and the cladding powder is sprayed to the substrate through the powder feeding nozzle while feeding the protective gas. The magnetic field generating device is connected to a DC power supply, and the output steady magnetic field acts on both sides of the cladding layer to realize non-contact steady magnetic field assisted laser cladding to modify the surface of the cladding substrate to improve the microstructure and surface comprehensive properties. The device has the advantages of small size, easy assembly, low cost and the like.

Description

A steady magnetic field assisted laser cladding device

technical field

The utility model aims at disclosing a laser cladding device assisted by a stable magnetic field, which belongs to the technical field of surface modification.

Background technique

Laser cladding technology uses a high-energy-density laser beam to fuse the cladding powder and the surface of the substrate to form a modified coating with a strong metallurgical bond. Its purpose is to improve the wear resistance, corrosion resistance, heat resistance, fatigue resistance and high temperature oxidation resistance of the substrate. However, due to its own characteristics of rapid heating and sudden cooling, the formed cladding layer structure is prone to defects such as cracks and pores, which leads to certain restrictions on the industrial application of laser cladding technology. Therefore, improving the solidification characteristics of the laser molten pool and thus improving the structure of the cladding layer has become an important problem to be solved urgently. The magnetic field-assisted laser cladding process can realize the non-contact external field action liquid metal molten pool, and achieve the purpose of optimizing the coating performance by changing the convection and crystallization characteristics of the laser molten pool melt.

Applying a magnetic field during metal solidification is one of the effective methods to improve the structure and mechanical properties of metals. In the above-mentioned patents on magnetic field-assisted laser cladding, it mainly involves the effect of steady magnetic field, alternating magnetic field and rotating magnetic field on the laser cladding process. The alternating/rotating magnetic field disclosed in the patent CN102703898 and the patent CN102703897 can generate electromagnetic stirring on the molten pool to strengthen the convection, so as to achieve the purpose of refining the structure, alleviating cracks, pores and uniform tissue composition; the static magnetic field disclosed in the patent CN103741138 is By suppressing the convection of the melt during the auxiliary laser cladding process, the purpose of regulating the solidification structure of the metal and optimizing its performance is achieved. Although the invention ingeniously designed a device to realize the coaxial recombination of the magnetic field and the laser beam, as shown in Figure 1 in the patent CN103741138, since the excitation coil 3 is wound around the magnetic core 4 and placed at the end of the coaxial laser channel 1, the There are several problems in the following aspects:

(1) Position 4 in Figure 1 of patent CN103741138 is easy to generate magnetic shielding, and the cladding substrate 5 is not in an area with high magnetic field strength, even if the device can produce relatively Large magnetic field, the cladding substrate 5 under the device is actually subjected to little magnetic field effect, and the magnetic field irradiation area is also very limited;

(2) In Figure 2 of patent CN103741138, the excitation coil 3 and the magnetic core 4 are placed at the end of the coaxial laser channel 1, and it is difficult to achieve a high magnetic field through a limited excitation coil in such a narrow space;

(3) The magnetic field device placed in channel 1 of the coaxial laser tends to generate heat when it is working, which is not conducive to the long-term high-power stable and reliable operation of the laser.

The deficiencies in the above aspects lead to little effect of the static magnetic field on the melt of the laser molten pool, and it is even difficult to realize the effective effect of the magnetic field on the laser cladding coating.

Contents of the invention

The purpose of this utility model is to provide a stable and constant magnetic field generating device with large irradiation range and high magnetic field intensity. The magnetic field generating device cooperates with laser cladding equipment to directly act on both sides of the cladding layer, so that the formation of the entire cladding layer The whole process is carried out under the action of a magnetic field; by improving the convection and crystallization characteristics of the liquid metal in the cladding layer, the microstructure of the laser cladding coating and the comprehensive performance of the coating surface are optimized.

The utility model provides a stable and constant magnetic field assisted laser cladding device. A support 8 is provided above the CNC machine tool 3 of the existing laser cladding device. A magnetic field generating device 6 is provided on the support 8. The magnetic field generating device 6 and a DC power supply 7 connection; the middle of the magnetic field generating device 6 is provided with a sample holder 4, the sample holder 4 is located directly below the laser gun head 11, the lower end of the sample holder 4 is fixed on the CNC machine tool 3, and can be moved together with the CNC machine tool for laser cladding The synchronous powder feeder 9 of the device communicates with the gas storage tank 10 and is used as a protective gas delivery device.

Preferably, the laser cladding device includes a cooler 1, a numerical control console 2, a numerical control machine tool 3, a synchronous powder feeder 9, an air storage tank 10, a laser gun head 11, and a laser 12, including a cooler 1 and a numerical control machine tool 3 , The synchronous powder feeder 9 is connected with the numerical control console 2, and the cooler 1 is connected with the laser 12.

The magnetic field generating device 6 described in the utility model is connected with the DC power supply 7 to generate a stable magnetic field to act on both sides of the cladding layer. The numerical control console 2 controls the laser 12 to generate laser light on the surface of the cladding substrate 5. The laser cladding process is in assisted by a steady magnetic field.

The sample fixture is a self-made part of 45 steel material, the purpose is to ensure that when a steady magnetic field is applied, the magnetic base material will not be shifted due to the magnetic field.

The magnetic field generating device 6 is connected with a DC power supply to generate a constant magnetic field of a certain intensity; changing the excitation current of the DC power supply can obtain a stable magnetic field of corresponding intensity to act on both sides of the cladding layer.

Before the laser cladding experiment, the surface of the cladding substrate needs to be polished, and then ultrasonically cleaned and dried with acetone and absolute ethanol for use; after the cladding alloy powder is dried and cooled, it is mixed with the adhesive in a certain proportion and placed in Cladding the surface layer of the base material and drying, or using the synchronous powder feeding method to load the dried alloy powder into the synchronous powder feeder.

During the laser cladding process, the cladding substrate is fixed on the sample fixture, the sample fixture is placed between a pair of magnetic poles of the magnetic field and perpendicular to its axis, and the height of the sample fixture is adjusted so that the preset layer is just in the magnetic field generating device The central axis of the magnetic pole; the laser beam is focused and irradiated on the surface of the substrate, and the excitation current of the DC power supply is adjusted to obtain a stable magnetic field of a certain intensity. The direction of the magnetic field is perpendicular to the scanning speed direction of the laser cladding; The operation console controls the movement of the CNC machine tool to obtain the laser cladding composite coating assisted by a stable and constant magnetic field.

Beneficial effects of the utility model: the utility model obtains a constant magnetic field of a certain intensity by changing the excitation current to assist the laser cladding process. The constant magnetic field can suppress the convection of the molten metal in the molten pool to a certain extent, and the convection of the molten metal in the complex melt And under the action of a magnetic field, the element distribution of the coating structure changes, and the columnar crystals break, which has a great impact on the structure and performance.

Description of drawings

Fig. 1 is a schematic structural diagram of the device described in Embodiment 1 of the present utility model.

Fig. 2 is a schematic structural diagram of the device described in Embodiment 2 of the present invention.

In the figure: 1-cooler; 2-NC console; 3-NC machine tool; 4-sample fixture; 5-clad substrate; 6-magnetic field generator; 7-DC power supply; 8-support; 9-synchronization Powder feeder; 10-air storage tank; 11-laser gun head; 12-laser.

detailed description

This part will provide embodiment, in order to set forth the specific implementation details of the present utility model.

Example 1

The stable magnetic field assisted laser cladding device described in this embodiment includes a cooler 1, a numerical control console 2, a numerical control machine tool 3, a synchronous powder feeder 9, a gas storage tank 10, a laser gun head 11, and a laser 12, including a cooler 1. The CNC machine tool 3 and the synchronous powder feeder 9 are all connected to the CNC console 2, and the cooler 1 is connected to the laser 12; a support 8 is provided above the CNC machine tool 3 of the laser cladding device, and a magnetic field generating device 6 is provided on the support 8 , the magnetic field generating device 6 is connected with the DC power supply 7; the middle of the magnetic field generating device 6 is provided with a sample holder 4, the sample holder 4 is located directly below the laser gun head 11, and the lower end of the sample holder 4 is fixed on the numerically controlled machine tool 3, The synchronous powder feeder 9 of the laser cladding device communicates with the gas storage tank 10 and is used as a protective gas delivery device. The excitation current range is 0-10A, the magnetic field strength range is 0-0.5T, and the number of magnetic poles of the magnetic field generating device 6 is a pair; the adjustable range of the DC power supply 7 in this embodiment is 0-10A, as shown in FIG. 1 .

Example 2

The stable and constant magnetic field assisted laser cladding device described in this embodiment is provided with a bracket 8 above the CNC machine tool 3 of the existing laser cladding device. Connection; the middle of the magnetic field generating device 6 is provided with a sample holder 4, the sample holder 4 is located directly below the laser gun head 11, the lower end of the sample holder 4 is fixed on the CNC machine tool 3, and the synchronous powder feeder of the laser cladding device 9 communicates with the gas storage tank 10 and is used as a protective gas delivery device. The excitation current ranges from 0 to 10A, the magnetic field strength ranges from 0 to 0.5T, and the number of magnetic poles of the magnetic field generating device 6 is two pairs; the adjustable range of the DC power supply 7 is 0 to 10A, as shown in FIG. 2 .

Claims (3)

1. A stable magnetic field assisted laser cladding device, characterized in that: a support (8) is provided above the CNC machine tool (3) of the laser cladding device, and a magnetic field generating device (6) is provided on the support (8), and the magnetic field The generating device (6) is connected to the DC power supply (7); the sample holder (4) is provided in the middle of the magnetic field generating device (6), and the sample holder (4) is located directly below the laser gun head (11). The lower end of (4) is fixed on the CNC machine tool (3), and the synchronous powder feeder (9) of the laser cladding device is connected with the gas storage tank (10) to be used as a protective gas delivery device. 2. The stable magnetic field assisted laser cladding device according to claim 1, characterized in that: the laser cladding device includes a cooler (1), a numerical control console (2), a numerical control machine tool (3), synchronous powder feeding Device (9), gas storage tank (10), laser gun head (11), laser device (12), including cooler (1), CNC machine tool (3), and synchronous powder feeder (9) are all connected with the CNC console ( 2) Connection, the cooler (1) is connected with the laser (12). 3. The constant magnetic field assisted laser cladding device according to claim 1, characterized in that: the magnetic field generating device (6) has more than one pair of magnetic poles.