The so-called acid-resistant stainless steel plate is actually a stainless steel material that can resist acid corrosion in all kinds of highly corrosive acid media. The acid corrosion resistance of the acid-proof stainless steel plate mainly depends on the chemical composition of the stainless steel plate, such as nickel, chromium, molybdenum and copper. And other alloying elements.
Usually the corrosion resistance of acid-resistant stainless steel plates in oxidizing acids is relatively good, while the corrosion resistance in reducing acids is relatively poor. The oxidizing acid is typically nitric acid and sulfuric acid, and the reducing acid is typically hydrochloric acid.
The acid-resistance stainless steel plate has relatively large plasticity and toughness. The problems that occur during the drilling of the acid-resistant stainless steel plate are mainly due to the fact that it is not easy to break the chips. This will seriously affect the smooth inflow of the cutting fluid. The temperature of the cutting zone is relatively high, and the tool durability is very high. Low, productivity is also relatively low. When drilling, the cutting load will be relatively large, and the chips will consume a very large amount of energy. Together with the high-temperature strength and hardness of such stainless steel plates, the cuttings are not easily broken when they are cut off; and the cold hardening phenomenon also occurs. It can be very serious, the surface hardening degree of the stainless steel plate can reach more than 100%, the thickness of the hardened layer reaches 0.1-0.2mm. The acid-resistant stainless steel plate has a low thermal conductivity of only 1/3-1/4 of that of carbon steel, a very high temperature in the cutting zone, a strong affinity with other metals, and a hard spot in the material. Increase the wear speed of the tool.
In order to solve the problem of chip breaking when drilling acid-resistant stainless steel plates, there are manufacturers who specialize in the research and development of new types of acid-resistant stainless steel chip breaking drills. When they are drilled, the chip length is about 100mm and they are discharged from the hole with a “fireworks” shape. The chip breaking effect is very high. Not bad.
The main point of this “fireworks” shaped chip in the drilling process is to make the chipping point in the critical chipping state; the second is to properly grind the drill tip height and arc radius; the third is to drill The hole position should be selected appropriately, and with a proper amount of feed and a lower cutting speed, the chip is naturally broken in the obliquely twisted state. In general, when using an acid-resistant stainless steel chip breaking drill, it is necessary to use a lower cutting speed and a larger feed rate, which is really beneficial for achieving the purpose of chip breaking.
Source: China Stainless Steel Plate Manufacturer – Yaang Pipe Industry Co., Limited (www.yaang.com)