CN85202254U

CN85202254U - Single edge rotary combined drill with center blade-inlaid

Info

Publication number: CN85202254U
Application number: CN 85202254
Authority: CN
Inventors: 董希仁
Original assignee: Individual
Current assignee: Individual
Priority date: 1985-06-11
Filing date: 1985-06-11
Publication date: 1986-10-08

Abstract

The utility model is composed of a drill body, a cutting blade, a support blade, a drill point blade and a fastening off-center pin. The cutting and the support blades are all indexing blades. One blade has the cutting action, and the other blade has the support action. The two blades are all fastened on the drill body by the off-center fastening pin. The drill point blade made of the high speed steel is arranged in the oblique groove of the drill point and is tightly matched with the groove. The blade is provided with a circular arc chip breaker groove, which chooses the different widths and uses the different shapes according to the different processing materials and apertures. The drill body can be used in long term, and the tail part is a Moh's taper circular cone.

Description

Single edge rotary combined drill with center blade-inlaid

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

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

Along with the development of indexable tool, the shallow bore hole drill bit of indexable carbide chip has appearred adopting, blade be four jiaos square, four cutting edges are arranged, and work is not ground again with after blunt, but unload position of conversion, and use another cutting edge, can change the position altogether four times.But the weak point that facts have proved this drill bit is: it must use on the machine tool of high-power, high revolution, good rigidly, and the rotating occasion of drill bit, must adopt special-purpose dop again; In order to guarantee to process the dimensional accuracy in aperture, blade must grind before using, and promptly guarantees the fine finishining of blade size, angle, reaches blade and is positioned at and infiltrates; And in drilling process, have two blades to participate in cutting simultaneously, the Compulsory pouring cooling fluid to dispel the heat.

For addressing these problems, task of the present utility model provides the indexable center of a kind of single-blade empiecement composite drill bit, it does not require machine tool high-power, high revolution, the lathe of poor rigidity also can use this composite drill bit, blade also is with four jiaos of blades of hard alloy rotatable, but needn't grind before using; And this composite drill bit has only blade to participate in cutwork, can transposition four times, and there are four cutting edges to utilize; Because the center studs with another blade, be actually a drilling process again, finished by two kinds of blades respectively by depth difference, drilling torque reduces greatly, can not force to add the inject cooling liquid heat radiation.

The utility model structurally is such: stud with a unbearable blade at center, the anterior top of drill body, according to different machining hole diameters, blade width (B) is chosen in 10～22 millimeters scopes, because blade is positioned at unbearable, cutting speed is low, chisel edge can select to such an extent that the spiral bit that uses when boring same hole is narrow, different materials according to processing, blade can be worn into different apex point shapes and angle can improve working (machining) efficiency, unbearable blade itself has the circular arc chip-breaker, make smear metal be broken shape bits, the chip removal smoothness, it is all right to dispel the heat; Just needn't force to add inject cooling liquid in the processing, also help carrying out production strictly in line with rules and regulations; Splicing of unbearable blade and drill body is to adopt the method for opening a drift slot (A) (channel section is a V-arrangement) on the drill body top along the vertical direction of drill body axis, blade is put into groove, the apex point that makes blade is on the drill body axis, two inclined-planes of drift slot become tight fit with two planes of blade, solid and reliable, it is convenient to change blade.The material of blade is a high-speed steel, good toughness, not tipping, not burned tip in the drilling; Unbearable blade width is greater than the minimum cutting diameter of cutting tip; Height will be exposed to after fastening outside the drift slot, is doubled in the degree of depth of groove.

In addition, at the anterior outer edge of drill body,, four jiaos of blades of two hard alloy rotatables (throw away) are fastened in the cutter groove of drill body by two eccentric holding pins; One of them blade plays continuous drilling effect, and another does not participate in drilling, only plays the supporting role of balanced cutting power, two blades lay respectively at the both sides of drill body axis, when fastening blade, can on cutter groove side-locating face, use the method for copper-surfaced sheet simultaneously, realize the fine setting of drill lip diameter dimension, when using blade, can grind before using, directly use, reduce 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; Fig. 2 is the left view of compound brill; Fig. 3 is the vertical view of compound brill.

In two cutter grooves of carbide chip (2), (3) are laid in drill body (1) both sides, top, cutting tip (2), supporting blade (3) are fastened on the drill body (1) by eccentric holding pin (5); The plane at four cutting edge places of cutting tip (2) and the 8 ° of angles of cut of planar line that pass through drill body (1) axis, blade (2), (3) line, the work edge of blade (2) and this plane parallel, intermediate distance is 4 millimeters, (blade thickness is 6 millimeters); After blade (2) was fixing, having formed relief angle was 8 °, and the blade of blade angle own is 20 °, so anterior angle is 12 °; And after the cutter groove also should make blade (2) put into, the cutwork sword becomes 70 ° of angles with the axis of drill body (1), each corresponding contact-making surface of groove face and blade will stick together, and the plane at four cutting edge places of supporting blade (3) is to be parallel to plane that drill body (1) axis, two blade lines formed; Two narrow parallel sided of blade (3) are in the axis of drill body (1), and two narrow sides are then perpendicular to the axis of drill body (1) in addition; That of cutter groove will guarantee all that to the degree of depth and axial depth each cutting edge of supporting blade (3) do not participate in cutting.

The apex point of unbearable blade (4) becomes 118 ° of angles, and work chisel edge branch is listed on two planes of both sides, 15 ° of anterior angles, and 8 ° of relief angles, and the circular arc chip-breaker is arranged; Unbearable blade (4) becomes tight fit with the supercentral drift slot (A) of drill body (1); The section of drift slot (A) is " V " shape, and groove angle is 5 °, and the fluting direction is and the axis normal of drill body (1) that the degree of depth is as the criterion with the cutter groove that does not influence cutting tip (2), supporting blade (3).After unbearable blade (4) is fixed in the drift slot, be exposed at the part size of groove outside, will be the size of groove depth, the width (B) of blade (4) is as the criterion with the bore dia of the minimum that can process greater than cutting tip (2), but is less than the diameter of drill body (1).

The afterbody of drill body (1) is the cone of Morse's taper.

Claims

1, the indexable center of the single-blade empiecement composite drill bit of processing major diameter shallow bore hole, this composite drill bit have drill body (1), cutting tip (2), supporting blade (3), unbearable blade (4) to form with two eccentric holding pins (5), it is characterized in that:

A cutting tip (2), supporting blade (3) are the anterior outer edges that is fastened on drill body (1) by eccentric holding pin [5];

B infiltrates blade (4) and becomes tight fit with the drift slot [A] at center, the anterior top of drill body (1);

2, composite drill bit according to claim 1 is characterized in that:

Cutting tip (2), supporting blade (3) are four jiaos of blades of hard alloy rotatable (throw away); Unbearable blade (4) is a high speed steel material; Blade width (B) is chosen between 10～22 millimeters, and the circular arc chip-breaker is arranged.