CN2037278U

CN2037278U - Dual blade rotary centre flat-inlaid compound bit

Info

Publication number: CN2037278U
Application number: CN 88214223
Authority: CN
Inventors: 董希仁
Original assignee: HARBIN TOOLS FACTORY NO 2
Current assignee: HARBIN TOOLS FACTORY NO 2
Priority date: 1988-09-23
Filing date: 1988-09-23
Publication date: 1989-05-10

Abstract

The utility model relates to a dual blade rotary centre flat-inlaid compound bit, comprising a bit body [3], a cutting blade [2], a drill point blade [1], a fastening pin [5] and a Moh's taper tail circular cone [4]. The cutting blade [2] is an indexing rhombic blade which is fixed in the blade groove of the bit body [3] by the fastening pin [5]. The drill point blade [1] made of the high speed steel is arranged at the drill point in the V-shaped groove and is matched with the groove. The blade [1] is provided with a circular arc chip breaker groove, which chooses the different widths and angles according to the different processing materials and apertures.

Description

Dual blade rotary centre flat-inlaid compound bit

The utility model relates to a kind of indexable center of twolip empiecement composite drill bit of processing metallic shallow bore hole, and it is specially adapted to disposable the getting out of large diameter hole (hole depth: 2D～3D, D are the machining hole diameter).

At present in metal cutting, the workload of drilling accounts for about 30%, but boring bar tool is compared with other cutter, operating efficiency is very low, and drilling speed has only 20～30 meters/minute, and according to statistics: diameter is in φ 20～60 millimeter, the hole depth hole less than three times of apertures, account for more than 1/4th of machining hole sum, the efficient that improves this class shallow bore hole drilling highly significant, this problem has caused common concern, and is devoted to the improvement of boring bar tool.

Development along with indexable tool, the drill bit of indexable carbide chip processing shallow bore hole has appearred using, the weak point that facts have proved this drill bit is: it must use on the machine tool of high-power, good rigidly, and in the rotating occasion of drill bit, must adopt special-purpose dop again.

In order to address this problem, the utility model is that the employing center studs with blade, two main cutting edges use the structure (needn't grind before using) of the indexable carbide chip of rhombus, be actually a drilling process, finished by two kinds of blades respectively by depth difference, drilling torque significantly reduces, and it not necessarily necessarily requires the machine tool of high-power good rigidly, in the drilling, also can not force to add the inject cooling liquid heat radiation.

On the structure, stud with a unbearable blade at center, the anterior top of drill body, according to the difference in processing aperture, blade width is chosen in 10～22 millimeters scopes, because unbearable cutting speed is low, chisel edge can select narrowlyer, according to different rapidoprints, blade can be worn into difformity and angle, so that improve working (machining) efficiency, blade itself has garden arc chip-breaker, make smear metal be broken shape bits, the chip removal smoothness, heat radiation is good, needn't force to add inject cooling liquid.

Splicing of unbearable blade and drill body is to open the groove of a section for " ∨ " shape on the drill body top along the vertical direction of drill body axis, blade is put into groove, the blade apex point is on the drill body axis, two inclined-planes of " ∨ " shape groove and two planes of blade are tight fit, and it is convenient to change blade.

Blade is selected high speed steel material for use, good toughness, not tipping, not burned tip in the drilling process; Unbearable blade width should be greater than the minimum drill diameter of cutting tip, and height will be exposed to the degree of depth that is doubled in groove outside " ∨ " shape groove after fastening.

On the rake face of drill body top, by two holding pins, two indexable rhombus carbide chips are fastened in the insert groove of rake face of drill body, two blades lay respectively at the both sides of drill body axis.When fastening blade, can on side-locating face,, realize the fine setting of drill lip diameter dimension with the method for boring copper sheet, can carry out the grinding of blade before using, directly use, reduced the secondary process time, also guaranteed the aperture size precision.

Compound brill drill body afterbody is the Morse's taper cone, and whole drill body can use for a long time.

Specify enforcement of the present utility model now in conjunction with the accompanying drawings, Fig. 1 is the front view of compound brill, and Fig. 2 is a left view.

On two rake faces of drill body (3) top, by holding pin (5) the indexable carbide chip of rhombus (2) is fastened in two cutter grooves, main cutting edge becomes 8 °～12 ° angle with the vertical line of drill body axis, and the main cutting edge of blade should be parallel with the former main cutting edge of drill bit.Groove face is close together with each corresponding contact-making surface of blade.

The drill point angle of unbearable blade (1) is 118 °, work chisel edge branch is listed on two planes of both sides, 15 ° of anterior angles, 8 ° of relief angles, and the circular arc chip-breaker arranged, unbearable blade (1) becomes tight fit with " ∨ " shape groove on drill body (3) top center, the subtended angle of " ∨ " shape groove is 5 °, the fluting direction is the axis normal with drill body (3), the degree of depth is as the criterion with the cutter groove that does not influence cutting tip (2), after unbearable blade (1) is fixed in " ∨ " shape groove, be exposed at the part size of groove outside, less than the degree of depth in groove, the bore dia that blade width is greater than the minimum that cutting tip (2) can process is as the criterion, but is less than the diameter of drill body (3).

The afterbody of drill body (3) is the cone of Morse's taper.

Claims

1, the indexable center of the twolip empiecement composite drill bit of processing major diameter shallow bore hole, this composite drill bit is made up of with the cone afterbody [4] of two holding pins [5], Morse's taper drill body [3], cutting tip [2], unbearable blade [1], it is characterized in that:

A cutting tip [2] is to be fastened in the insert groove of anterior rake face of drill body [3] by holding pin [5];

B infiltrates blade [1] and becomes tight fit with center, the anterior top of drill body [3] " V " shape groove.

2, composite drill bit according to claim 1 is characterized in that: cutting tip is a rhombus hard gold alloy indexable insert tip, throw away tip; Unbearable blade (1) is a high speed steel material, and blade width is chosen between 10～22 millimeters, and the circular arc chip-breaker is arranged.