The popularization of multimedia teaching began several years ago

 The popularization of multimedia teaching began several years ago, including the application of green laser pointer .
This method is a simple process, high alloy material utilization, good controllability, easy automation, more frequent use of actual production. Process: the substrate surface pretreatment → preheat → Feeding laser melting → heat treatment. Alloy pre-law, will be the cladding alloy to a certain pre-covered surface, then cover the alloy surface scanning laser beam, so that the entire alloy covering layer and part of the substrate melting, the laser beam after the departure of melting metal rapid solidification and metallurgical bonding of the cladding layer formed on the substrate surface. The process: the substrate surface pretreatment → preset cladding materials → preheat → laser melting → heat treatment. The teacher has to operate it and explain some key points at the same time without green laser pointer .
The laser cladding process parameters: laser power, scan speed, spot size, to send the amount of powder. Most mold is the working conditions are poor working conditions, protection of the mold surface treatment is very important. Forging dies, for example, hot forging die general alloy tool steel 5CrNiMo or 5CrMnMo manufacturing, forging die to work in high temperatures and under certain loading conditions, poor working conditions, the mold surface should have good high temperature strength, thermal fatigue performance and wear resistance, the use of laser cladding surface treatment technologies can achieve the requirements. It turns out that teachers’ action is chained if green laser pointer is not used.
According to the practical work of the hot forging dies, the hot forging die surface coating material for carbide composite powder NiCrAl/Cr3C2 process method for the alloy synchronization method. The operation of the specific process is as follows: the substrate cladding surface pretreatment of the substrate surface is heated to about 300-450 ℃ oil to the oil or organic cleaning agents. Sandblasted to remove the substrate surface rust, and its coarse, powder-attached. Preheat the stove heating the surface of the substrate is heated to a certain temperature, and appropriate to reduce the temperature difference between the substrate and cladding layer in order to reduce the stress of cladding layers expand and contract. Synchronization powder feeding laser melting in order to ensure the cladding quality, the correct choice of laser power, scan speed, spot diameter and the powder feed rate.