A kind of composite drill bit
The utility model relates to a kind of composite drill bit, especially can once finish the drill bit of the high efficiency Compound Machining of boring, reaming operation.
At present, generally the drill bit of Shi Yonging mostly is single type, when drilling larger aperture workpiece, usually all be to drill through earlier with a smaller drill bit earlier, and then change this drill bit, remove second reaming with bigger drill bit again, on operating time and labour intensity and operating efficiency, all can not reach effect preferably.
The utility model content
The purpose of this utility model is a kind of composite drill bit of design, can once finish the processing tasks of boring, reaming.
The technical scheme that its technical problem that solves the utility model adopts is: this composite drill bit is combined by large and small drill bit and interior cooling pipe.Its cooling tube is divided into one straight pipeline and two helical pipes, and the straight pipeline inlet is provided with gas thread; Little chisel edge position is provided with the web thinning face; The cutting edge of large and small drill bit is provided with open slot.
The utility model is in process, after the drilling of bradawl head, the big bit part of back directly carries out reaming, and cooling fluid or gas can directly carry out interior cooling to the cutting edge of its composite drill bit by the threaded hole in cooling hole, can effectively solve the phenomenon because of stifled bits that heat in metal cutting produces, the burning of bits, bit freezing.
The beneficial effect of a kind of composite drill bit of the utility model is: can will hole in an action, the reaming operation once finishes, and the open slot of design and cooling hole can make drilling more laborsaving, smooth and easy.When reducing manufacturing procedure, play reducing labor intensity, save the working time, the effect of increasing work efficiency.
Description of drawings
Accompanying drawing 1 is the structural representation of a kind of composite drill bit of this utility model, and Fig. 2 is that a kind of composite drill bit A is to schematic diagram.
Among Fig. 1-2,1 is bradawl head open slot, and 2 is big drill bit open slot, and 3 is the web thinning face, and 4 are cooling hole threaded hole, and 5 are cooling hole straight hole, and 6 is cooling port gas thread silk hole, and 7 is little drill bit, and 8 is big drill bit, and 9 is drillstock.
The specific embodiment
For making the purpose of this utility model, technical scheme clearer, the utility model is described in further detail below in conjunction with the accompanying drawing specific embodiment.
Referring to legend, when the operator processes larger-diameter hole, can directly use this composite drill bit, do not need to use the drill bit of two kinds of different-diameters successively to change drilling by traditional diamond-making technique.This composite drill bit adds man-hour, and leading portion bradawl head 7 bears the drilling task, and the big drill bit 8 of back segment is finished the counterboring task.
The little chisel edge place of this a kind of composite drill bit is provided with web thinning face 3, and has opened 1 and 2 cutting slot respectively on the cutting edge of little drill bit and big drill bit, makes cutting resistance littler, and drilling is more laborsaving, and chip removal is more smooth.In the indoor design of drill bit cooling hole straight hole 5 and threaded hole 4, can coolant pipe and cooling tracheae be installed by the gas thread 6 of straight pipeline inlet, like this, when drilling, strong sufficient cooling fluid or gas can directly reduce by the cutting temperature of threaded hole 4 with cutting surface fast, make the cutting edge of this composite drill bit remain sharp state, the normal heating that occurs in avoiding processing, stifled bits, the burning of bits, the phenomenon of bit freezing, especially more favourable to the processing of deep hole, the processing technology of this composite drill bit is compared traditional boring, the reaming processing technology is convenient, safety, laborsaving, efficient aspect effect is fairly obvious.