High-power Shiny Surface Cutting Techniques(Part 2)


27/07/2019

Followed by the high-power shiny surface cutting techniques mentioned in the previous class, many partners have raised various questions about this technology. Nowadays, intelligent equipment is gradually replacing the traditional labor manufacturing industry, the requirement for more refined and high-quality cutting product has become the focus and competition key of every user.

Today we will share the high-power shiny surface cutting techniques.

Six key points of high-power shiny surface cutting techniques:

Cutting Speed Adjustment

Compared to normal cutting, the cutting speed of high-power machine will be greatly improved. However, the appropriate cutting speed is more important, because it will directly affect the cutting quality of the product.

If the cutting speed is too fast, the burning will be incomplete, the workpiece will not be cut through. If the cutting speed is too slow, it will lead to excessive burning. Therefore, in calibration process of high-power shiny surface cutting , the standard that we will pay attention to and measure is whether the section is normal or cut through while keep the speed as fast as possible.

Nozzle Height Adjustment

Shiny surface cutting has high requirements on beam propagation, oxygen purity and gas flow direction. Because nozzle height directly affects these three factors, we need to adjust the height of the nozzle properly during high-power cutting. The lower the nozzle height, the closer the beam to the plate surface, the higher the beam propagation quality, the higher the purity of oxygen, and the lower the gas flow to other direction. Therefore, it is better to have lower nozzle height in the cutting process if sensor is not affected.

Cutting Air Pressure Regulation

It can be said that the chemical reaction accounts for the major effect in the cutting of carbon steel. In order to balance heat produced by the burning of C and the chemical reaction of Fe, we must pay attention to the pressure of oxygen, which should not be too large. Another concern is that we should also take notice of the control range of the proportional valve. Generally, the closer to the minimum value of the control range of the proportional valve, the brighter the cut section. Although in order to ensure the stability of the carbon steel plate with the same thickness but different quality, it is better to increase the ratio based on the best section pressure value.

Cutting Power Regulation

Same as the principle of cutting air pressure, in order to balance the heat produced by burning of C and the chemical reaction of Fe, the energy used for cutting plates with various thicknesses is different. Rule: As the thickness of the plate increases, so does the required energy.

Cutting Focus Size Adjustment

After the radiation of fiber laser source, the beam emitted on the nozzle by diffusion and focus process has a certain diameter. The nozzle used in our shiny surface cutting technique is relatively small. In addition to the external factors, if our focus is too large, the light spot will shot on the cutting nozzle and directly cause damage of the cutting nozzle and change of airflow direction. Hence, affecting the cutting quality. Besides, if the focus is adjusted to excessively large, it will heat up the nozzle, which affects the servo induction causing unstable cutting quality. Therefore, we should firstly eliminate the external factors, and then find out the maximum focus value matching the corresponding nozzle size, and then adjust accordingly.

Nozzle Size Selection

Shiny surface cutting has a very high airflow standard. Theoretically the angle between airflow and spot diameter is one of the most important direct factor that can influence the shiny surface quality, so we should control it strictly.

Since the angle of the beam diameter is generally small. In order to match it, the angle of the airflow needs to be controlled within a small range as well. Therefore, we will choose a smaller nozzle when we need a shiny surace. Furthermore, in  some extent, the smaller the nozzle, the brighter the cutting section, and the better the effect.

Class summary:

The technical skills of high-power shiny cutting technology are mainly focus on the following six points: cutting speed, nozzle height, cutting pressure, cutting power, cutting focus and nozzle size.

‘Appropriate speed, lower nozzle height, smaller cutting air pressure, suitable power for corresponding plate thickness, proper focus (angle of spot), smaller nozzle.”

*The above information is for reference only. Correctly adjustment is required based on the actual on-site situation.