In machining, hole processing accounts for about one-fifth of the total amount of machining, of which drilling accounts for about 30% of the total hole processing. I believe that gold fans working on the front line of drilling are familiar with drill bits. When purchasing drill bits, there will be drill bits of different materials and colors. So what is the difference between different colors of drill bits? Is the color related to the quality of drill bits? Which color of drill bits is better to buy?
Is the color of the bit related to the quality?
First of all, it is impossible to distinguish the quality of the drill bit simply from the color. There is no direct and inevitable relationship between color and quality. Different color bits are mainly different processing processes. Of course, a general judgment can be made from the color, but at present, poor-quality drill bits will also process their own colors to achieve the appearance of high-quality drill bits. Style.
What's the difference between different color drill bits?
High-quality fully grinding high-speed steel drill bits often appear in white. Of course, rolled drill bits can also achieve white by grinding the outer circle. The reason why it is high quality is that in addition to the material itself, the quality control in the grinding process is also quite strict, and there will be no burns on the surface of the tool. Black is a nitrided drill bit, which is a chemical method to improve the durability of the tool after placing the finished tool in a mixture of ammonia and water vapor. After insulation treatment at 540~560C. At present, most of the black drill bits on the market are only black (in order to cover up burns or black leather on the surface of the tool), but the actual use effect has not been effectively improved.
There are three processes for producing drill bits. Black is rolled, which is the worst. The white one is clear and ground. Because unlike rolling, it does not produce high-temperature oxidation, the grain structure of steel has not been damaged and is used to drill workpieces with slightly higher hardness. The tan drill bit is called cobalt-containing drill in the industry, which is the unspoken rule of the industry of this bit. Cobalt-containing diamonds were originally white and ground and produced. When it was later atomized, it was made of tan (commonly referred to as amber), which is the best in circulation at present. Another Kind Of M35 (Co 5%) Is Gold. This Kind Of Drill Bit Is Called Titanium-plated Drill, Which Is Divided Into Decorative Plating And Industrial Plating. Decorative plating has no effect at all, but it looks good and golden. Industrial plating is excellent, and the hardness can reach HRC78, which is higher than that of cobalt-containing drills (HRC54).
