CN87212416U - Adjustable single-sided cutting rough and finish drill bit without refacing - Google Patents

Abstract

The utility model discloses an adjustable and throw-away bit of rough and finish, for single-sided cutting, and assembled up by a cutter body, a fastening guiding element, an adjustable guiding element and throw-away knife-blade machines with centre holes. A polygon knife blade fastened in a knife trough at the front end of a bit body serves for the cutting task; the fastening guiding element and the adjustable guiding element around the body serve for the guiding task; the bit body is also provided with a completely independent working portion which serves for the cutting and sleeking; namely, a throw-away knife blade fastened in an inclined knife trough above the adjustable guiding element is used for cutting and sleeking. The utility model which has the advantages of simple structure and high reliability of blade fastening can adjust the dimension of the bit and can guarantee the finish processing of deep holes.

Description

Adjustable single-sided cutting rough and finish drill bit without refacing

The present invention is a kind of metal-cutting machine tool.

There is not the thick smart drill bit of the adjustable monolateral cutting of throw away in the prior art, and the adjustable monolateral cut drill of more advanced throw away.Adjustable monolateral cut drill (certificate of invention 3284505) as the edge indexable insert tip, throw away tip of the Soviet Union, system is used for structural steel and the alloy fine finishining of the deep hole of part in addition, it has a polygonal blade, place the cutter groove of bit body front end, adopt the central screw clamping mode, blade is fastening, a fastening guide is installed on the periphery of body.The round end that another adjustable guide has polishing is welded on the bolt, bolt is screwed into drill body And and locks with limit screw, change adjustable guide, overhang can be adjusted the size of drill bit, this drill bit structure is simple, adopt the adjustable adjusting range that can enlarge drill bit, change processing dimension, because the adjustable guide that work in-process is adjusted, carry less, only bear radial cutting component, make that polishing round end work in-process can play roll extrusion smoothing effect on the adjustable guide, to guarantee the fine finishining of deep hole, but the mode that this employing polishing round end comes work in-process to carry out the roll extrusion smoothing can not effectively be eliminated the darker cutting remaining trace that produces on the hole wall in the drilling, can not control the dimensional tolerance of processing mesopore accurately.

The present invention is the change to Soviet Union's drill bit, promptly at the original part of serving as cutwork of drill body, (see in the accompanying drawing 3) with serve as the part of guiding work, comprise fastening guiding (see in the accompanying drawing 8) and adjustable guiding (see in the accompanying drawing 10), (polishing round end work in-process plays roll extrusion smoothing effect on the original herein adjustable guide, only play the guiding role here.) architecture basics on, acquired a working portion of independently serving as cutting smoothing task.Its concrete practice is, that tilts above adjustable guide has opened one and has had the cutter groove that two cell walls and baseplane have center screw, settle in the cutter groove indexable insert tip, throw away tip of serving as the square band centre bore of cutting smoothing task (see in the accompanying drawing 5) blade to take central screw (see in the accompanying drawing 6) clamping mode to come fastening, the front of blade has positive rake angle, its main cutting edge and cutter hub axis have an angle of inclination, to guarantee that the blade front has the front end of the main cutting edge of positive rake angle, there are one and processed hole wall to prolong the facet blade that axially parallels, cut smoothing, so just can make reducing that the hole wall surface cutting remaining trace of processing tries one's best, effectively raise the surface smoothness of hole wall, this employing is at the front end of cutting smoothing blade, its front has positive rake angle again; And and a facet blade that can parallel vertically with hole wall in cutting, the next practice that in drilling, realizes the cutting smoothing of hole wall, be all " fluted drills ", comprise Ni Zhifu drill, and three swords of domestic and international up-to-date employing, " fluted drills " such as four swords all can't be realized because of its fixing " fried dough twist formula " design feature, on the cutter groove bottom at blade rear, opened simultaneously a screw for the screw use of the eccentric head of band, disposed the screw (see in the accompanying drawing 7) of an eccentric head of band in the screw, tighten the eccentric head branch that this screw makes it, the work that has served as the 3rd cutter cell wall is in order to the six-freedom degree in the effective elimination blade installation, a screw for the adjustment screw use has been opened in the top of blade on cutter hub, an adjustment screw without a head (see in the accompanying drawing 4) is housed in the screw, cutting depth when being used for regulating the blade smoothing, with the dimensional accuracy of effective control processing and the surface smoothness of realizing ideal, this drill bit size that can regulate drill bit not only simple in structure can guarantee the fine finishining of deep hole, also can be made into the dimensions of series according to the difference of the specification of the blade of selecting for use.

It should be noted that also that at last design of the present invention promptly above-mentioned is acquired a practice of independently serving as the operate portions of cutting smoothing task, it can also be applicable in the drill bit of some machine clamping structures and press from both sides thick smart drill bit in order to be made into other forms of machine.

Accompanying drawing is the thick smart drill bit overview of the adjustable monolateral cutting of throw away.---central screw, 3---polygon blade, 4---adjustment screw, 5---square blade, 6---center pinching screw, 7---band dog screw, 8---the adjustable guide of fastening guide, 9---limit screw, 10---of 1-cutter hub, 2 among the figure.

Claims (3)

1, the thick smart drill bit of the adjustable monolateral cutting of throw away is by cutter hub, fastening guide, adjustable guide, the blade machinery of throw away band centre bore is assembled, the adjustable monolateral cut drill of throw away has a polygon blade, place the cutter groove of cutter hub front end, adopt the central screw clamping mode that blade is fastening, settle a fastening guide on the periphery of cutter hub, with one have the polishing round end, afterbody is externally threaded cylindrical adjustable guide, it is screwed in the cutter hub by the external screw thread of afterbody; And locks with limit screw, and the overhang that changes adjustable guide can be adjusted the size of drill bit.The invention is characterized in: it has acquired a working portion of fully independently serving as cutting smoothing task on the original architecture basics of the adjustable monolateral cut drill of above-mentioned throw away.An indexable insert tip, throw away tip of serving as the square band centre bore of cutting smoothing task is settled in having opened in a cutter groove with two cell walls, baseplane band center screw, the cutter groove of promptly tilting above former adjustable guide.It is fastening that blade adopts the central screw clamping mode.The main cutting edge of blade and cutter hub axis have an angle of inclination, on the cutter bottom land plane at blade rear, opened a screw, the screw of an eccentric head of band is housed in the screw, on the cutter hub above the inboard blade on cutter bottom land plane, opened a screw, an adjustment screw is housed in the screw.

2, the thick smart drill bit of the adjustable monolateral cutting of throw away according to claim 1, blade, blade fastening that its one serves as cutting smoothing task takes that the central screw clamping mode is meant, blade is installed in one and has the place ahead, two cell wall cutter bottom land planes and have cutter groove Zhong ， And that a band dog screw is housed on another screw that a center screw, rear open tightening, blade is clamped in the cutter groove by a screw that passes blade center hole and cutter groove center screw.

3, the thick smart drill bit of the adjustable monolateral cutting of throw away according to claim 1, its feature is to have acquired a working portion of fully independently serving as cutting smoothing task on bit body, the square band centre bore indexable insert tip, throw away tip that it serves as cutting smoothing task has positive rake angle.

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