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2020
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How does the column tooth drill bit fix the alloy to the drill bit
The method of fixing teeth of drill bit refers to how to fix the hard alloy column teeth of rock drilling on the drill bit body. At present, there are three general methods of fixing teeth in China's drilling tool industry: welding, cold fixing teeth and hot setting teeth.
How does the column tooth drill bit fix the alloy to the drill bit
The method of fixing teeth of drill bit refers to how to fix the hard alloy column teeth of rock drilling on the drill bit body. At present, there are three general methods of fixing teeth in China's drilling tool industry: welding, cold fixing teeth and hot setting teeth.
1) Welding process is the earliest tooth fixing process. Its method is relatively simple. It mainly determines the size of the tooth hole and the alloy column tooth through the welding gap, drills the corresponding tooth hole on the drill head body according to the structure of the drill head, and then welds the alloy column tooth on the drill head body by brazing or silver welding. The requirements for drilling accuracy and column tooth size are not high. The disadvantage is that the operation is relatively difficult, easy to leave a scar to affect the appearance, and prone to lack of welding, welding strength is not high, the life of the drill bit is low. More for the production of taper hole connection small diameter ball tooth bit, has now been phased out.
2) The cold-fixed tooth process (cold-pressed process) is currently adopted by most enterprises,The key points of the process are based on the yield limit of the steel used for the drill head body.,Calculate the fit clearance between the tooth hole and the alloy column,Method of using interference fit,The column teeth are pressed into the perforations by external forces. Its characteristic is that the process is easy to master,Relatively high production efficiency,But stability is lacking. When pressing the alloy column tooth into the tooth hole,The drill bit body and column teeth are easily damaged under the action of external force.,Limited overall bit life,Especially late life is poor,Easy to appear off teeth, broken teeth and other phenomena. Now it is mainly used in the thread ball tooth drill bit with relatively low requirements or without repeated grinding.
3) For the use of thread ball tooth drill bits with higher requirements, we advocate the use of hot insert technology, that is, alloy steel with better thermal expansion and toughness is selected as the steel for the drill bit body. According to the difference in thermal expansion between the steel body and the alloy column teeth under the same heating conditions, the alloy column teeth can be embedded on the drill bit body by selecting the appropriate interference. Hot insert tooth fixing process drill bit products are more suitable for repeated grinding of products, and the material and strength of the drill bit pants are better than those of the cold press tooth fixing drill bit, with higher hardness, stronger adaptability and better stability.
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