What are the effects of thermal expansion on the cutting accuracy of CNC cutting machines?

As a common method of current enterprise processing, thermal cutting has been widely used in all walks of life. The advantages of using thermal cutting are economical processing cost and stable cutting quality. However, the disadvantage of CNC cutting machine thermal cutting is the effect of thermal expansion caused by local high temperature on cutting accuracy. What is the impact of thermal expansion on the cutting accuracy of the CNC cutting machine in use? The following small series will give you a brief introduction.

In the actual cutting process of the CNC cutting machine, the cutting parts on the entire steel plate are sequential. When cutting, the temperature of the steel plate is close to room temperature, but the cutting speed of the part is very fast, especially when the part is not very large, the whole steel plate has not had time to heat up and expand when cutting a part; or although there is a local temperature rise, the thermal expansion at room temperature is affected by the surrounding steel plate The size of the cutting part is precise and accurate. With the increase of cutting parts and the continuous input of heat, the temperature of the steel plate increases, and the thermal expansion increases. If a one-way thermal expansion compensation amount △t is not added to the slotting compensation k, the measured size of the re-cut part after cooling to room temperature will deviate from the measured size of the cut part. The deviation will vary with the thermal expansion of the steel plate. Increase and increase until it tends to balance (that is, the heat input of cutting and the heat dissipation of the steel plate reach a basic balance). This is due to the different thermal expansion of the steel plate at different temperatures, which results in the volume change of the steel plate. If the grooving compensation k is not corrected (increase the thermal expansion compensation amount △t), the cutting track will not change, so the volume and size of the cut parts will be reduced after cooling.

In actual operation, you must pay attention to controlling the cutting temperature of the CNC cutting machine to avoid unnecessary waste.

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