A kind of high-efficiency high-accuracy depth drill
The utility model belongs to the metal cutting tool technical field, relates to the high-efficiency high-accuracy depth drill in a kind of Drilling operation.
Drill bit (ratio in hole depth (L) and aperture (D) is greater than 5 o'clock, i.e. L/d〉5, be called deep hole machining) when deep hole machining, owing to have the problems such as chip removal, lubricated, instrument vibration, so be difficult to reach processing request.Main manifestations is front top rake angle for cutting under the condition of sealing near the chisel edge of center, and machining condition is abominable, chip breaking and chip removal difficulty, and heat in metal cutting is difficult for the diffusion cooling, and drilling rod is elongated, and system rigidity is poor.
Existing technology mainly is to inhale by drill gun and spray to bore the processing of finishing deep hole, but these processing technologys have certain requirement and need a large amount of aids to realize equipment, not too suitable for this technique of single and mini-batch production deep hole machining, and along with present machinery industry fast development, model change is more and more faster, thus sometimes production line just set up may be out-of-date.Therefore, there are some improved technology in the existing technology:
Notification number is that the patent documentation of CN2036077 discloses a kind of depth twist drill, the spiral flute type of this drill bit is formed by parabola and circular arc Linear Rotation, and without land, chip pocket is wide, employing than large helix angle and zero draft thick brill core, apex point adopts the correction of cross reconditioning method.But this drill bit is darker because of machining hole in when work, and machining status is abominable, if drill bit without land, will there be the bad problem of guiding in cutter, be easy to bore inclined to one side during boring.
Notification number is that the patent documentation of CN2806004Y discloses a kind of spiral bit, it comprises cutter hub, cutter head, on the described cutter hub spiral goove is arranged, the cutting tip of described cutter head comprise two symmetries cutting edge, the front cutting edge of two symmetries, the front cutting edge of described two symmetries connects by boring core, the centre of two cutting edges that are connected becomes the S type, both sides are that the land of linear pattern main cutting edge drill bit has selfguided function, and the land place of outside and guide frame not only play bearing load and also play the assurance dimensional accuracy, guiding, the effect of location and compressive surface.Can suppress the relative centre of gyration that the negative rake because of chisel edge causes eccentric, traditional technology is that the cylindrical at depth twist drill arranges two symmetrical lands, although improved selfguided function, has increased frictional resistance, cause that the cutting moment of torque increases, and chatter easily occurs in process.
Number of patent application 201110400400.8 discloses a kind of Double-margin depth drill design of distribution or asymmetrical distribution, although make each land in working angles, be in out of phase, stop the generation of the generation of resonance, but also bring thus the imbalance of moment in working angles, can not improve the precision in hole.
The utility model content
The purpose of this utility model improves for above weak point exactly, to the Double-margin that led bad specialized designs, plays the double action of guiding and burnishing-in; For the large shortcoming of resistance, make two margin width sums equal the width of an original land, not only solved guiding bad, also solved resistance problem, thereby a kind of high-efficiency high-accuracy depth drill is provided.
The technical solution of the utility model:
A kind of high-efficiency high-accuracy depth drill, drill bit comprises cutting tip and shank, cutting tip comprises a chisel edge, article two, the main cutting edge take the drill bit centre of gyration as symmetry axis, article two, same minor cutting edge take the drill bit centre of gyration as symmetry axis, the bandwidth sum of the bandwidth of a main cutting edge and a minor cutting edge equal the bandwidth width with the single-blade band drill bit under the condition directly.
Main cutting edge is corresponding with main chip area in smoothing junction; Minor cutting edge and time corresponding connection of chip area.
Main cutting edge is the inner concave curve sword.
Chisel edge is the S type, and chisel edge outwards connects main cutting edge, and main cutting edge and main land circular arc smoothly join, and minor cutting edge smoothly joins with time land circular arc.
The beneficial effects of the utility model:
1. the Double-margin design makes processed hole surface quality good, so the good hole perpendicularity that processes of the guiding of cutter itself is good;
2. the hole circle degree that processes is good, and secondary land can carry out assisted machining and burnishing-in effect, and the working (machining) efficiency of cutter is high, and the hole fineness that processes is good;
3. double chip removing grooves design chip removal is better, is not easy to stop up groove;
4. special fluting design had both guaranteed rigidity, had to solve the chip removal problem;
5. do not use aid just can realize good guide function, saved the working time.
Description of drawings
Fig. 1 is that the master of the utility model embodiment 1 looks schematic diagram.
The specific embodiment
The utility model is by the following examples can the utility model will be further described, yet scope of the present utility model is not limited to following embodiment.
Drill bit comprises cutting tip and shank, cutting tip comprises a short chisel edge 1, article two, main cutting edge 2-1, the 2-2 take the drill bit centre of gyration as symmetry axis, article two, same minor cutting edge 3-1,3-2 take the drill bit centre of gyration as symmetry axis, the bandwidth sum of the bandwidth of main cutting edge 2-1, a 2-2 and minor cutting edge 3-1, a 3-2 equals the bandwidth width with the single-blade band drill bit under the condition directly.
Main cutting edge 2-1,2-2 are corresponding with main chip area 4-1,4-2 in smoothing junction; Minor cutting edge 3-1,3-2 and time corresponding connection of chip area 5-1,5-2.
Chisel edge 1 is the S type, it is characterized in that chisel edge 1 outwards connects main cutting edge 2-1,2-2, and main cutting edge 2-1,2-2 and main land circular arc smoothly join, and minor cutting edge 3-1,3-2 and time land circular arc smoothly join.
When drill bit crept into, two main cutting edge 2-1,2-2 and two minor cutting edge 3-1,3-2 worked simultaneously, have significantly improved stock-removing efficiency, allow processing work under high feeding condition.
The bandwidth of the present embodiment main cutting edge 2-1, a 2-2 and the bandwidth sum of minor cutting edge 3-1, a 3-2 equal the bandwidth width with the single-blade band drill bit under the condition of footpath, and make guiding fine very little with resistance through reasonable computation; The design of Double-margin double chip removing grooves; Main cutting edge 2-1,2-2 are the inner concave curve sword; Chisel edge 1 reconditioning is short S type.
Bear drill tasks by main cutting edge 2-1,2-2 and main land thereof, inferior land is born the hole task of finish reaming, and well combines cutting, leads and support these tasks.Make drill bit have very high borehole accuracy (can reach IT8), surface roughness the best can be to Ra 0.8mm, and concentricity is less than 4 um, and very high dimensional stability is arranged, improve cutting-tool's used life, also can obtain above-mentioned identical effect even process discontinuous hole.