drill bit made by carbide or steel knot cemented carbide

Cemented Carbide is a hard material used extensively as cutting tool material, as well as other industrial applications. It consists of fine particles of carbide cemented into a composite by a binder metal. Cemented carbides commonly use tungsten carbide (WC), titanium carbide (TiC), or tantalum carbide (TaC) as the aggregate. Mentions of “carbide” or “tungsten carbide” in industrial contexts usually refer to these cemented composites.

Most of the time, carbide cutters will leave a better surface finish on the part, and allow faster machining than high-speed steel or other tool steels. Carbide tools can withstand higher temperatures at the cutter-workpiece interface than standard high-speed steel tools (which is a principal reason for the faster machining). Carbide is usually superior for the cutting of tough materials such as carbon steel or stainless steel, as well as in situations where other cutting tools would wear away faster, such as high-quantity production runs.

———–Reference from https://en.wikipedia.org/wiki/Cemented_carbide

Binder metal in Steel Knot Cemented Carbide is not Co or Ni as usually, is steel. So, more cheaper than cemented carbide with good machining performance after heat treatment process as wear-resistant parts in mechine is a big advantage. It is C. G. Goetze who firstly developed steel knot cemented carbide based on TiC and high speed steel in 1955.

For carbide, WC+Co, hardness is HRA 92, and for steel carbide, hardness is HRA 89. Usually, price of steel carbide is 3/4 of common carbide, and the advantage of steel knot carbide is that it can be rolling, forging, annealing and welding. Many uses of steel knot carbide have not yet been developed. Meanwhile, the processing accuracy, precision, of Purple Pavilion is ±0.005mm or even ±0.001mm on carbide. 

Here are prictures and movie of carbide and steel knot carbide.

movie1- tooth of drill bit made by steel knot carbide, HRA 89 

pictures of tooth of drill bit made by steel knot carbide, HRA 89

pictures of small diameter steel carbide drill bit, HRA 89

pictures of steel knot carbide welded on surface of machine, HRA89

pictures of precision of carbide for drill bit is ±0.005mm, HRA 92

movie-1 of precision of carbide with ±0.005mm, HRA 92

movie-2 of precision of carbide with ±0.005mm, HRA 92

movie-3 of precision of carbide with ±0.005mm, HRA 92

movie-4 of precision of carbide with ±0.005mm, HRA 92

movie-5 of precision of carbide+steel with ±0.005mm, HRA 92 

Purple Pavilion is also focusing on this kind of large diameter carbide or steel knot carbide drill bit. Meanwhile, Purple Pavilion is planning to develop a brand new type drill bit by steel knot carbide and new base alloy this year, more wearing-resistant steel+more cheap steel knot carbide .

Here are movies related drill bit.

Movie-1 carbide or steel knot carbide drill bit

Movie-2 carbide or steel knot carbide drill bit

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