[Technical application] 3D printing technology to repair coal mine machinery sprocket

The laser stereo forming technology combines rapid prototyping technology and laser cladding technology, and is an advanced manufacturing technology for the purpose of achieving high-performance and complex structural metal parts without mold, fast and all-compact near-net forming. The laser stereo forming technology is adopted, which belongs to one of 3D printing technologies . Compared with traditional machining methods, laser stereo forming technology eliminates the need for tools, fixtures and machine tools to create any shape, and its strength and plasticity can reach the forging level, in order to solve the high-performance direct forming and quick repair of equipment maintenance parts. The problem provides a technical shortcut.

According to the 3D model data of the part, the application of laser stereo forming technology enables the material to be stacked point by point, line by line, layer by layer, and the parts are manufactured quickly and accurately. This is an "additive material" manufacturing method.

This "additive material" manufacturing method, after half a year of trial use, for the problem of sprocket ring collapse and excessive wear caused by 3D printing technology, the technicians have rationally adjusted the repair process and printed powder ratio, in the shape of the repaired area and The shape defect of the part is refined.

It is reported that the sprocket ring cooperates with the chain for a long time. Under the action of huge impact force, the sprocket ring tooth surface is easy to wear and break. Generally, it is repaired by the traditional argon arc welding repair welding process, but it is necessary to use the wear-resistant welding rod. The sprocket ring is repaired, the upper CNC milling machine is used to mill the supporting chain teeth, and the tooth surface is quenched.

The premise of using 3D printing technology to repair coal machine components is to build a large database of component prototypes. This depends on a series of hardware and software. It is necessary to use the coordinate measuring instrument for detailed measurement of newly purchased components before entering the warehouse. The accuracy of the measured data is directly It is related to the dimensional accuracy of the later repaired parts. The repaired parts need to be tested in the downhole working environment, and the repair process and powder are adjusted according to the trial conditions.

“In the repair process, the laser beam direction and energy controllability are good, which is beneficial to accurately determine the repair area and minimize the deformation of the sprocket ring. The area to be repaired and the sprocket ring body are dense metallurgical combination, which is not easy to cause The body is peeled off and peeled off. The shape of the repaired area and the shape of the part of the repair are close, the surface quality is high, no post-processing is required, and the whole process is formed, and the whole process is controlled by computer, which is reliable, reproducible and more beautiful.” Zhang Hongqing, who is responsible for the repair, said "The actual service life of the repaired sprocket ring can basically reach the new level and the cost is lower."

It is understood that 74 pieces of sprocket ring repaired by 3D printing technology, if all purchase new ring ring requires 12 million yuan, but the use of 3D printing technology to repair the sprocket ring only needs 6.7 million yuan, saving 5.3 million yuan.

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