CN217941966U

CN217941966U - Stepped drill bit with auxiliary cutter groove

Info

Publication number: CN217941966U
Application number: CN202221790577.3U
Authority: CN
Inventors: 张大帅; 杨军鹏; 王雪雪
Original assignee: Jinzhou Jinggong Technology Kunshan Co ltd
Current assignee: Jinzhou Jinggong Technology Kunshan Co ltd
Priority date: 2022-07-12
Filing date: 2022-07-12
Publication date: 2022-12-02
Anticipated expiration: 2032-07-12

Abstract

The utility model discloses a step drill with auxiliary cutter grooves, which can not only improve the strength of the step blade to ensure that the cutting edge is not easy to break up and the service life of the drill is prolonged by arranging the auxiliary cutter grooves on the stud of the cutting part; the roughness of the surface of the machined workpiece can be effectively improved; meanwhile, the inflow of cutting fluid can be increased, and the auxiliary drill bit cooling and processing lubricating effects are achieved.

Description

Stepped drill bit with auxiliary cutter groove

Technical Field

The utility model relates to a drill bit, concretely relates to ladder drill bit with auxiliary cutter groove.

Background

Existing step drills have the same number of flutes, i.e. typically two, as the number of cutting edges on the drill tip. Such an embodiment is relatively low cost in manufacturing and provides good tool stability. During machining of the workpiece, the chips removed by the drill tip and the chips removed by the chamfer of the drill are both extracted from the same chip flute. When drilling ductile, long-cut workpiece materials, the chips removed by the drill tip are thus caused to collide with the chips removed by the drill tip at the drilling step. This generally prevents chips from being extracted from the drill tip, and even allows the drill tip to break off or chip off, reducing the service life of the step drill while reducing the roughness of the surface of the machined workpiece.

Disclosure of Invention

In order to overcome the defects, the utility model provides a can prevent that drill bit most advanced and ladder sword from damaging, improve drill bit life and workpiece surface's roughness's ladder drill bit with supplementary sword groove.

The utility model discloses a solve the technical scheme that its technical problem adopted and be: the stepped drill bit with the auxiliary cutter groove comprises a clamping part and a cutting part arranged at the front end of the clamping part, wherein the outer diameter of the cutting part is smaller than that of the clamping part, and a chamfer part is formed at the joint of the cutting part and the clamping part; the cutting portion is kept away from the one end of clamping part has most advanced, most advanced has a plurality of cutting edges of injecing the geometric shape, the cutting edge is furnished with the chip groove respectively, the chip groove is followed the axis of cutting portion is the spiral backward and is extended, wherein, adjacent form the double-screw bolt between the chip groove, the front end of double-screw bolt with most advanced formation week sword, supplementary sword groove has been seted up on the double-screw bolt, supplementary sword groove by week sword spiral backward extends will the ladder sword symmetry of chamfer is cut apart.

As a further improvement of the present invention, the angle between the chamfer portion and the central axis of the clamping portion is 89 ° to 91 °.

As a further improvement of the utility model, the sharp angle of the pointed end is 118-120 degrees.

As a further improvement of the utility model, the outer diameter of the clamping part is 6.0 to 12.0mm.

As a further improvement of the utility model, the outer diameter of the cutting part is 3.0 to 12.0mm.

The utility model has the advantages that: the auxiliary cutter groove is formed in the stud of the cutting part, so that the strength of the step blade can be improved, the cutting edge is not easy to break, the service life of the drill bit is prolonged, and the roughness of the surface of a processed workpiece is improved; but also can increase the inflow of the cutting fluid, and has the functions of assisting the temperature reduction of the drill bit and the processing lubrication.

Drawings

FIG. 1 is a schematic structural view of the present invention;

fig. 2 is an enlarged schematic view of the cutting portion of the present invention.

The following description is made with reference to the accompanying drawings:

1. a clamping part; 2. a cutting portion; 21. a tip; 211. a cutting edge; 212. a peripheral edge; 22. a chip groove; 23. a stud; 231. an auxiliary knife slot; 3. chamfering the corner; 31. a step edge.

Detailed Description

The following description of a preferred embodiment of the present invention will be made in conjunction with the accompanying drawings.

Referring to fig. 1 and 2, an embodiment of a stepped drill bit with an auxiliary cutter groove according to the present invention is a stepped drill bit with an auxiliary cutter groove, which includes a clamping portion 1 and a cutting portion 2 disposed at a front end of the clamping portion 1, wherein an outer diameter of the cutting portion 2 is smaller than an outer diameter of the clamping portion 1, and a chamfer portion 3 is formed at a joint of the cutting portion 2 and the clamping portion 1; the end of the cutting part 2 far away from the clamping part 1 is provided with a tip 21, the tip 21 is provided with a plurality of cutting edges 211 with limited geometric shapes, the cutting edges 211 are respectively provided with chip discharge grooves 22, the chip discharge grooves 22 spirally extend backwards along the axis of the cutting part 2, screw studs 23 are formed between the adjacent chip discharge grooves 22, the front ends of the screw studs 23 and the tip 21 form a peripheral edge 212, auxiliary tool grooves 231 are formed in the screw studs 23, and the auxiliary tool grooves 231 are symmetrically divided by the peripheral edge 212 spirally extending backwards to divide the step edges 31 of the chamfer part 3.

Specifically, since the outer diameter D of the cutting portion 2 is smaller than the outer diameter D of the clamping portion, the chamfered portion 3 is inevitably formed at the junction of the cutting portion 2 and the clamping portion 1, that is, the front end of the clamping portion 1 is a blade body having a step shape. The front end of the chamfer part 3 is connected with the rear end of the cutting part 2 with the small diameter D, and the rear end of the chamfer part 3 is connected with the front end of the clamping part 1 with the large diameter D. Therefore, the utility model discloses a ladder drill bit is integrated into one piece. In the present embodiment, two chip flutes 22 are provided, the two chip flutes 22 are spirally and symmetrically disposed on the cutting portion 2, two symmetrical studs 23 are formed between the two chip flutes 22, and the tip 21 has a cutting edge 211 corresponding to the chip flute 22 and a peripheral edge 212 corresponding to the stud 23. The auxiliary blade groove 231 formed in the stud 23 extends rearward from the peripheral edge 212 until the step edge 31 of the chamfered portion 3 is divided into two symmetrical parts. That is, the stepped drill without the auxiliary flutes 231 has two symmetrical step edges 31 of the chamfered portion 3, and the added auxiliary flutes 231 divide the step edges 31 into four symmetrical pieces, and the peripheral edges 212 are also divided into four symmetrical pieces simultaneously. In the cutting process, the cutting amount of the small step blade and the peripheral blade is small, so that the strength of the step blade and the peripheral blade can be improved, the cutting edge is not easy to break, and the service life of the step drill bit is prolonged; and the roughness of the surface of the processed workpiece can be effectively improved. Meanwhile, the cutting fluid can flow into the machining area through the chip discharge groove 22 and the auxiliary cutter groove 231 at the same time, the flow rate of the cutting fluid is increased, and the cooling and the machining lubrication of the drill bit can be assisted.

Further, the angle of the chamfer 3 to the central axis of the clamping part 1 is 89 ° to 91 °; the tip angle α of the tip 21 is 118 ° to 120 °; the outer diameter D of the clamping part 1 is 6.0-12.0 mm; the cutting part 2 has an outer diameter d of 3.0 to 12mm. If the cutting portion 2 is selected to have an outer diameter of 3.0mm, the outer diameter of the clamping portion is preferably selected to be 6.0mm.

In summary, the stepped drill bit with the auxiliary cutter groove provided by the utility model has the advantages that the auxiliary cutter groove is arranged on the stud of the cutting part, so that the strength of the stepped blade can be improved, the cutting edge is not easy to break, and the service life of the drill bit is prolonged; the roughness of the surface of the machined workpiece can be effectively improved; meanwhile, the inflow of cutting fluid can be increased, and the auxiliary drill bit cooling and processing lubricating effects are achieved.

In the previous description, numerous specific details were set forth in order to provide a thorough understanding of the invention. The foregoing description is only illustrative of the preferred embodiments of the invention, which can be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. All the contents that do not depart from the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiments according to the technical substance of the present invention all still belong to the protection scope of the technical solution of the present invention.

Claims

1. A step drill with an auxiliary cutter groove comprises a clamping part (1) and a cutting part (2) arranged at the front end of the clamping part (1), wherein the outer diameter of the cutting part (2) is smaller than that of the clamping part (1), and a chamfer part (3) is formed at the joint of the cutting part (2) and the clamping part (1); one end of the cutting part (2) far away from the clamping part (1) is provided with a tip (21), the tip (21) is provided with a plurality of cutting edges (211) with limited geometrical shapes, the cutting edges (211) are respectively provided with a chip discharge groove (22), the chip discharge groove (22) extends along the axis of the cutting part (2) in a backward spiral mode, and the cutting part is characterized in that: a stud (23) is formed between the adjacent chip discharge grooves (22), a peripheral edge (212) is formed at the front end and the tip of the stud (23), an auxiliary cutter groove (231) is formed in the stud (23), and the auxiliary cutter groove (231) is spirally extended backwards from the peripheral edge (212) to symmetrically divide the step edge (31) of the chamfer part (3).

2. The stepped drill bit with auxiliary flutes of claim 1, wherein: the angle between the chamfer (3) and the central axis of the clamping part (1) is 89-91 degrees.

3. The stepped drill bit with auxiliary flutes of claim 1, wherein: the tip (21) has a tip angle of 118 ° to 120 °.

4. The stepped drill bit with the auxiliary pocket of claim 1, wherein: the outer diameter of the clamping part (1) is 6.0-12.0 mm.

5. The stepped drill bit with auxiliary flutes of claim 1, wherein: the outer diameter of the cutting part (2) is 3.0 to 12.0mm.