CN209936047U - Deep hole spiral tap - Google Patents

Abstract

The utility model relates to a deep hole spiral screw tap, including cylindricality cutter body and handle of a knife, be equipped with a plurality of teeth of attacking on the cutter body, be equipped with a plurality of chip grooves in line and spiral chip groove on a plurality of tooth's of attacking cutter body, chip groove in line extends to the cutter body top, and the side top is equipped with the side chip groove, the side chip groove inclines in chip groove inner wall in line, and the bottom is the arc structure, spiral chip groove top and chip groove bottom intercommunication in line, the spiral chip groove on the handle of a knife is the pitch increase for the round from the spiral number of turns, adopt comparatively flat chip groove bits in line, and make the cutter body structure that attacks the total length of tooth is less, the great diameter of neck portion, chip groove bottom cooperation extends to on the handle of a knife, the helicla flute structure that the pitch increases, increase afterbody chip removal performance, reduce cutter cutting resistance, Avoid the cutter accumulated chip wearing and tearing and cutter body to break and decrease, be favorable to improving cutter life and high-speed deep hole machining precision.

Description

Deep hole spiral tap

Technical Field

The utility model relates to a deep hole spiral screw tap belongs to cutting tool technical field.

Background

The screw tap makes a cutting processing internal thread's cutter, can divide into spiral screw tap and straight flute screw tap according to the shape, common spiral screw tap is opened there is the slot also called the screw tap in the axial, it is used for numerical control machining center to bore the blind hole usefulness most, the process velocity is very fast, but the chip groove of spiral tip screw tap is limited, at the deep hole in-process of high-speed grinding, because the longer overhang of handle of a knife is longer, there is not good of tip chip removal performance, the total length of tapping is great than handle of a knife diameter ratio, there is spiral cutter body rupture risk, and if adopt the straight flute screw tap processing deep hole, because the moment of torsion is great, afterbody smear metal is difficult for discharging, lead to the smear metal resistance to increase, influence defect speed, increase cutter wearing and tearing, thereby lead to.

SUMMERY OF THE UTILITY MODEL

The utility model aims at prior art's defect, provide a deep hole spiral tap, the tip adopts comparatively flat chip groove cuttings in line to make and attack the cutter body structure that the tooth overall length is less, the neck diameter is great, on the cooperation of chip groove bottom in line extended to the handle of a knife, the helicla flute structure that the pitch increases, increase afterbody chip removal performance, reduce cutter cutting resistance, avoid the long-pending bits wearing and tearing of cutter and cutter body breaking, be benefited in improving cutter life and high-speed deep hole machining precision.

The utility model discloses a realize through following technical scheme:

a deep hole spiral screw tap comprises a cylindrical cutter body and a cutter handle which are connected into an integral structure, wherein a plurality of tapping teeth which are uniformly arranged at intervals are arranged on the cutter body, the outer diameter of the cutter handle is smaller than the outer diameter of the cutter body, the total length of the plurality of tapping teeth is L, the outer diameter of the cutter body is d, L is smaller than or equal to 2d, a plurality of straight chip grooves and spiral chip grooves are formed in the cutter body of the plurality of tapping teeth, the plurality of chip grooves are uniformly arranged at intervals around the cutter body in a circle, the straight chip grooves extend to the top of the cutter body, side chip grooves are formed in the side top of the cutter body, the side chip grooves are inclined to the inner wall of the straight chip grooves, the bottom of each straight chip groove is of an arc structure, and the side top of each top chip groove extends to the adjacent straight chip grooves;

two inner walls mutually perpendicular of chip groove in line, and the bottom are the arc structure, spiral chip groove top and chip groove bottom intercommunication in line extend to the handle of a knife on the spiral chip groove bottom extends to the handle of a knife, and the spiral chip groove on the handle of a knife is the pitch increase of round from the spiral number of turns, the handle of a knife bottom is equipped with the hexagonal cylinder, be equipped with the screw that extends to the handle of a knife in the hexagonal cylinder.

The utility model has the advantages that:

(1) the end part of the cutter body is provided with a relatively flat straight chip groove for chip removal, the chip removal depth is increased through the inclined side chip groove, the inclined chip groove enables the top cutter face to be sharper, the chip breaking is smooth, the chip accumulation phenomenon at the end part during deep hole milling is avoided, the cutting resistance is reduced, the screw tap arm thickness for spiral chip removal at the end part is larger, and the breaking risk of high-speed cutting can be reduced; (2) the size design that the total length of tapping is less than or equal to 2 times of the diameter of the cutter body is adopted, and the length of the tapping part is shorter than that of a common spiral screw tap, so that the frictional resistance can be reduced, and the cutter body is prevented from being broken; (3) the spiral chip removal groove is connected with the arc-shaped bottom of the straight chip removal groove and extends to the cutter handle, so that the problems that the cutter handle is long in overhang and insufficient in chip removal force due to the fact that only a straight groove is used for removing chips during deep hole milling are solved; (4) the spiral chip groove on the cutter handle has the advantages that the pitch is increased from the fact that the number of spiral turns is one circle, the chips can be smoothly discharged from the bottom of the cutter groove, the chips are prevented from being accumulated and abraded, and therefore the service life of the cutter is prolonged, and the high-speed deep hole machining precision is improved.

Drawings

Fig. 1 is a top perspective view of the present invention.

Fig. 2 is a bottom perspective view of the present invention.

Fig. 3 is a front view of the present invention.

Fig. 4 is a side view of the present invention.

Fig. 5 is a top view of the present invention.

(in the figure, thecutter body 1, the cutter handle 2, thetapping 3, theboss 4, thefirst round angle 5, thestraight chip groove 6, thespiral chip groove 7, theside chip groove 8, thetop chip groove 9, thesecond round angle 10, thehexagonal cylinder 11 and the screw hole 12).

Detailed Description

The following describes the present invention with reference to the accompanying drawings.

The utility model provides a deep hole spiral tap, includes thecylindricality cutter body 1 and the handle of aknife 2 that even formula structure becomes, be equipped with thetooth 3 of attacking that a plurality of even intervals set up on thecutter body 1, 2 external diameters of handle of a knife are less than 1 external diameters of cutter body, and wherein, a plurality of total length of attackingtooth 3 are L, and 1 external diameter of cutter body is d, and L less than or equal to 2 d. The size design of thetapping 3 with the total length of the tapping 3 being less than or equal to 2 times of the outer diameter of thecutter body 1 is adopted, so that the tooth part is shorter than a common spiral screw tap, and the tap is suitable for avoiding the breakage of thecutter body 1 at the tooth part during deep hole processing so as to prolong the service life of the screw tap.

Be equipped withboss 4 between 1 bottom of cutter body and the handle of aknife 2,boss 4 outer wall is arc structure, and is equipped withfirst fillet 5 between bottom and the handle of aknife 2. Adopt the outer wall to becurved boss 4 as the neck ofcutter body 1 and handle of aknife 2, guarantee neck thickness to throughfirst fillet 5 and the transition of handle of aknife 2, guarantee that the neck supports stably, reduce the rupture risk.

Thecutter body 1 of the plurality of tappingteeth 3 is provided with a plurality ofstraight chip grooves 6 andspiral chip grooves 7, the plurality of chip grooves are uniformly arranged around thecutter body 1 at intervals, thestraight chip grooves 6 extend to the top of thecutter body 1, the side top of the cutter body is provided withside chip grooves 8, theside chip grooves 8 are inclined to the inner walls of thestraight chip grooves 6, the bottoms of the side chip grooves are of arc structures, thecutter body 1 at the side top of theside chip grooves 8 is provided withtop chip grooves 9, thetop chip grooves 9 are inclined to the inner walls of thestraight chip grooves 6, the bottoms of the top chip grooves are of arc structures, and the side tops of thetop chip grooves 9 extend to the adjacent;

two inner walls mutually perpendicular ofchip groove 6 in line, and the bottom is the arc structure, be equipped withsecond fillet 10 between two inner walls ofchip groove 6 in line. Thesecond round angle 10 is adopted to transition the inner wall of thestraight chip groove 6, so that the area of the inner wall of theside chip groove 8 is larger, the smoothness of chip breaking at the top of the side chip groove is ensured, chip adhesion at the corner of the inner wall of thestraight chip groove 6 is avoided, and the chip removal performance is improved.

The top of thespiral chip groove 7 is communicated with the bottom of thestraight chip groove 6, the bottom of thespiral chip groove 7 extends to thecutter handle 2, and thespiral chip groove 7 on thecutter handle 2 is increased in pitch by a circle of spiral turns.

The number of thestraight chip grooves 6 and the number of thespiral chip grooves 7 are three. The three chip grooves are uniformly distributed, so that the situation that the depth of the correspondingspiral chip grooves 7 is shallow due to too many chip grooves is avoided, smooth chip removal is ensured, and the risk of breaking thecutter handle 2 is reduced.

The bottom of theknife handle 2 is provided with ahexagonal column 11, and ascrew hole 12 extending to theknife handle 2 is arranged in thehexagonal column 11. The structure of thetool handle 2 with thescrew hole 12 and thehexagonal cylinder 11 is adopted, so that thetool handle 2 is convenient to screw, and thescrew hole 12 and a driving machine tool are quickly assembled and disassembled.

When thetool shank 2 is loaded on a machine tool and used for deep hole thread milling, the inclined chip grooves enable the top tool face to be sharper, and chip breaking is smooth, and chips generated by tapping 3 of thetool body 1 adjacent to thestraight chip grooves 6 are discharged from thestraight chip grooves 6 through thespiral chip grooves 7;

the end part of thecutter body 1 is provided with the relatively flatstraight chip groove 6 for chip removal, and the chip removal depth is increased through the inclinedside chip groove 8, so that the chip accumulation phenomenon at the end part during deep hole milling is avoided, the cutting resistance is reduced, the screw tap arm thickness for chip removal is larger than that of the end part in a spiral manner, and the fracture risk of high-speed cutting can be reduced;

thespiral chip groove 7 is connected with the arc-shaped bottom of thestraight chip groove 6 and extends to thecutter handle 2, so that the problems that thecutter handle 2 is long in overhanging and only adopts straight groove chip removal and insufficient in chip removal force when deep hole milling is avoided, thespiral chip groove 7 on thecutter handle 2 is increased in pitch from the fact that the number of spiral turns is one circle, chips can be smoothly discharged from the bottom of the cutter along with the rotation of thecutter handle 2, the abrasion of accumulated chips of a cutter is avoided, and the cutter is beneficial to prolonging the service life of the cutter and improving the machining precision of high-speed deep holes.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (6)

1. A deep hole spiral screw tap comprises a cylindrical cutter body and a cutter handle which are connected into an integral structure, wherein a plurality of tapping teeth which are uniformly arranged at intervals are arranged on the cutter body, the outer diameter of the cutter handle is smaller than the outer diameter of the cutter body, the deep hole spiral screw tap is characterized in that a plurality of straight chip grooves and spiral chip grooves are arranged on the cutter body of the tapping teeth, a plurality of chip grooves are uniformly arranged at intervals around the cutter body in a circle, the straight chip grooves extend to the top of the cutter body, side chip grooves are arranged at the top of the cutter body, the side chip grooves are inclined to the inner wall of the straight chip grooves, the bottom of each side chip groove is of an arc structure, the top chip grooves are inclined to the inner wall of the straight chip grooves, the bottoms of the side chip grooves are of the arc;

two inner walls mutually perpendicular of chip groove in line, and the bottom are the arc structure, spiral chip groove top and chip groove bottom intercommunication in line extend to the handle of a knife on the spiral chip groove bottom extends to the handle of a knife, and the spiral chip groove on the handle of a knife is the increase of pitch of round from the spiral number of turns.

2. The deep-hole spiral tap according to claim 1, wherein the total length of the plurality of taps is L, the outer diameter of the tap body is d, and L is 2d or less.

3. The deep-hole spiral tap according to claim 2, wherein a boss is arranged between the bottom of the tap body and the tap handle, the outer wall of the boss is of an arc-shaped structure, and a first round angle is arranged between the bottom of the boss and the tap handle.

4. A deep-hole spiral tap according to claim 1, wherein a second rounded corner is provided between two inner walls of said straight flutes.

5. The deep hole spiral tap according to claim 1, wherein the number of the straight flutes and the spiral flutes is three.

6. The deep-hole spiral tap according to any one of claims 1 ~ 5 wherein the bottom of the shank is provided with a hexagonal cylinder having a threaded bore extending into the shank.

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