CN216575693U

CN216575693U - Scratch-proof drill bit for drilling

Info

Publication number: CN216575693U
Application number: CN202122410244.5U
Authority: CN
Inventors: 高怀伟; 苗振邦
Original assignee: Binzhou Daisen Wheel Technology Co ltd
Current assignee: Binzhou Daisen Wheel Technology Co ltd
Priority date: 2021-09-30
Filing date: 2021-09-30
Publication date: 2022-05-24
Anticipated expiration: 2031-09-30

Abstract

The utility model provides a drill bit capable of preventing scratches during drilling, which adopts the following scheme: including the drill bit main part, the drill bit main part includes stalk portion and fixed connection in the cutting part of stalk portion front end, be provided with two section at least cutting edges on the cutting part, the axis spiral setting of drill bit main part is followed to the cutting edge, forms the helicla flute that the chip removal was used between the cutting edge, the tip of cutting edge intersects in the drill core point department of drill bit main part. The device is simple to manufacture, low in price and low in use cost, can ensure that the sticky bits are always kept at the inner side of the outer edge turning point, and when the drill bit retracts, the sticky bits cannot contact the side wall of the drill hole, so that the inner hole is effectively prevented from being scratched by the sticky bits or accumulated bits; the rejection rate can be effectively reduced, and the product quality is stabilized.

Description

Scratch-proof drill bit for drilling

Technical Field

The utility model relates to the technical field related to drill bit machining, in particular to a scratch-proof drill bit for drilling.

Background

When the automobile hub is produced, in a drilling process, due to the fact that a drill bit tip sticks chips or accumulated chip nodules are formed in the drilling process, when the drill bit retreats, the drill bit tip sticks chips or the accumulated chip nodules contact with the inner wall of a drill hole, scratches are formed on the inner wall of the drill hole, certain influences are caused on the appearance of a product, even the inner wall of the drill hole is scratched, and the assembly characteristic of the drill hole is seriously influenced.

SUMMERY OF THE UTILITY MODEL

The utility model provides a scratch-proof drill for drilling, aiming at overcoming the defect that the drill tip is easy to scratch the inner wall of a drill hole due to chip sticking and chip accumulation.

The technical scheme adopted by the utility model for solving the technical problems is as follows: the utility model provides a fish tail drill bit is prevented in drilling, includes drill bit main part, drill bit main part includes stalk portion and fixed connection in the cutting part of stalk portion front end, be provided with two sections at least cutting edges on the cutting part, the cutting edge forms the helicla flute that the row bits were used along drill bit main part's axis spiral setting between the cutting edge, the tip of cutting edge intersects in drill core point department of drill bit main part. When the drilling process is carried out, the handle part is arranged in the clamping part of the machine tool, and the drill bit main body is driven to do circular motion and feed motion, so that the first cutting edge and the second cutting edge are driven to drill into a workpiece to be processed for cutting the drilling depth and drilling a through hole; then, the drill bit body is continuously driven to feed, the aperture side blade cuts, the drilling aperture is machined, and the drilling diameter and the drilling precision are ensured to meet the requirements; chips generated in the cutting process are discharged through the spiral groove; in addition, the first cutting edge and the second cutting edge are arranged to be broken line edge surfaces, and after the outer edge turning point deviates to the cutting edge, the chip sticking part of the cutting edge is always kept at the inner side of the outer edge turning point, so that the drill point is prevented from sticking chips or accumulating chips to scratch a drill hole.

Further, the drill main body further comprises a transition part arranged at the joint of the cutting part and the handle part, and a first transition fillet is arranged at the joint of the transition part and the handle part. The first transition fillet is arranged, so that the torsional strength of the joint of the transition part and the handle part can be increased, and the breakage in the drilling process can be prevented.

Furthermore, the cross section of the spiral groove is in a concave arc shape, the spiral groove extends to the transition part from the drill core tip in a spiral mode, and the depth of the spiral groove is gradually reduced. The concave arc-shaped spiral groove is arranged, so that cutting resistance can be reduced, the abrasion degree of a cutting edge is reduced, and the service life of the drill bit is prolonged.

Further, the cutting edge includes first cutting edge and second cutting edge, first cutting edge and second cutting edge link to each other, are the broken line setting, the sharp angle of first cutting edge is 118, the sharp angle of second cutting edge is not more than 30. The first cutting edge and the second cutting edge are arranged to be broken line edge faces, so that after the outer edge turning point deviates to the cutting edge, the chip adhering part of the cutting edge is always kept at the inner side of the outer edge turning point, and the purpose of avoiding scratching a drill hole by adhering chips or accumulating chips is achieved.

Further, a ratio of a length of the second cutting edge to a maximum diameter of the edge portion is approximately equal to 1: 4. The length of the second cutting edge is limited, and the cutting capacity of the drill and the shape of the drilled hole are ensured.

Further, the cutting edge also comprises an aperture side edge, a second transition fillet is arranged between the aperture side edge and the drill tip, and the edge inclination angle of the aperture side edge is 11 degrees. The cutting amount of the aperture side edge is enhanced, and the hole expanding efficiency is improved.

Further, the aperture side edge comprises an inclined edge face and a straight edge face, the second transition fillet extends to form the inclined edge face, the large end of the inclined edge face is connected with the straight edge face, the straight edge face is connected with a transition portion, and the diameter of the transition portion is equal to that of the straight edge face. The inclined blade face can play a role in buffering, the blade is prevented from being broken or broken, abrasion is reduced, and the service life of the drill bit is prolonged.

According to the technical scheme, the utility model has the following advantages:

the scheme provides a drill bit capable of preventing scratches during drilling, the device is simple to manufacture, low in price and low in use cost, a sticky chip part can be guaranteed to be kept inside an outer edge turning point all the time, sticky chips cannot contact the side wall of a drill hole when the drill bit moves back, and the inner hole is effectively prevented from being scratched by sticky chips or accumulated chips; the rejection rate can be effectively reduced, and the product quality is stabilized.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description will be briefly introduced, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Fig. 2 is a top view of fig. 1.

Fig. 3 is a cross-sectional view a-a of fig. 1.

Fig. 4 is a cross-sectional view of B-B in fig. 3.

In the figure, 1, a drill main body, 2, an edge part, 3, a shank part, 4, a transition part, 5, a first transition fillet I, 6, a drill core tip, 7, a first cutting edge, 8, a second cutting edge, 9, a spiral groove, 10, a hole diameter side edge, 11, a second transition fillet II, 12, an inclined cutting surface, 13 and a straight cutting surface.

Detailed Description

In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the present embodiment, and it is apparent that the embodiments described below are only a part of embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the scope of protection of this patent.

As shown in fig. 1 to 4, a drill bit for preventing scratches during drilling comprises a drill bit body 1, wherein the drill bit body 1 comprises a shank 3 and an edge part 2 fixedly connected to the front end of the shank 3, at least two sections of cutting edges are arranged on the edge part 2, the cutting edges are spirally arranged along the axis of the drill bit body 1, a spiral groove 9 for chip removal is formed between the cutting edges, and the end parts of the cutting edges are intersected at a core tip 6 of the drill bit body 1. The cutting edge adopts the tungsten carbide steel blade, and the stalk portion adopts SKS3 material, and the cutter body hardness is HRC 40-55, and the blade hardness is HRC 90 +/-2.

In the present embodiment, the specific structure of the cutting edge is as follows: the cutting edge is including the first cutting edge 7 and the second cutting edge 8 that are located the drill point, and first cutting edge 7 and second cutting edge 8 link to each other, and both are the broken line setting, and the sharp angle of first cutting edge 7 is 118, and the sharp angle of second cutting edge 8 is not more than 30. Wherein, the most preferred embodiment is that the angle of the edge of the first cutting edge 7 is 118 degrees, and the angle of the edge of the second cutting edge 8 is 20 degrees; the blade face can be set to have the inclination of 0.05-0.12 per 100 of the length, the first cutting edge 7 and the second cutting edge 8 are set to be broken line blade faces, the outer edge turning point deviates to the cutting edge, and the chip sticking part of the cutting edge is always kept at the inner side of the outer edge turning point, so that the purpose of preventing the inner hole from being scratched by the sticking chips or the accumulated chips is achieved.

Specifically, the ratio of the length of the second cutting edge 8 to the maximum diameter of the edge portion 2 is approximately equal to 1: 4. The diameter of the normally arranged edge part 2 is 11.5mm, and the length of the second cutting edge 8 is 3 mm; the length of the second cutting edge 8 is limited to ensure the cutting ability of the drill and the shape of the drilled hole.

The cutting edge further comprises an aperture side edge 10, a second transition fillet 11 is arranged between the aperture side edge 10 and the drill tip, and the edge inclination angle of the aperture side edge 10 is 11 degrees. The diameter of the aperture side edge 10 can be changed by arranging a variable diameter connecting part; the blade inclination angle of the aperture side blade 10 is set to 11 degrees, so that the cutting amount of the aperture side blade 10 is favorably enhanced, and the hole expanding efficiency is improved.

In the present embodiment, the specific structure of the aperture side edge 10 is as follows: the aperture side edge 10 comprises an inclined edge face 12 and a straight edge face 13, the second transition fillet 11 extends to form the inclined edge face 12, the big end of the inclined edge face 12 is connected with the straight edge face 13, the straight edge face 13 is connected with the transition part 4, and the diameter of the transition part 4 is equal to that of the straight edge face 13. Transition fillets can be arranged at two ends of the straight edge surface 13, in another embodiment, the aperture side edge 10 can be arranged into two inclined edge surfaces 12 with smaller inclination angles, and one end close to the handle 3 is also provided with an arc bending section; the inclined blade face 12 can play a role in buffering, so that the blade is prevented from being broken or broken, abrasion is reduced, and the service life of the drill bit is prolonged.

In addition, the drill bit body 1 further comprises a transition part 4 arranged at the joint of the blade part 2 and the handle part 3, and a transition round corner I5 is arranged at the joint of the transition part 4 and the handle part 3. The arrangement of the first transition fillet 5 can increase the torsional strength of the joint of the transition part 4 and the handle part 3, and prevent the fracture in the drilling process.

In the present embodiment, the spiral groove 9 has a specific structure that the cross section of the spiral groove 9 is concave arc-shaped, the spiral groove 9 extends spirally from the drill tip 6 to the transition portion 4, and the depth of the spiral groove 9 is gradually reduced. An inwards concave groove can be arranged on one side of the spiral groove 9 close to the transition part 4 for breaking chips, so that the chips can be effectively prevented from being stuck by the drill bit; the concave arc-shaped spiral groove 9 is arranged, so that cutting resistance can be reduced, the abrasion degree of a cutting edge is reduced, and the service life of the drill bit is prolonged.

The working principle of the scratch-proof drill for drilling is as follows: when a drilling process is carried out, the handle part 3 is arranged in a clamping part of a machine tool, and the drill bit main body 1 is driven to do circular motion and feed motion, so that the first cutting edge 7 and the second cutting edge 8 are driven to drill into a workpiece to be processed for cutting the drilling depth to form a through hole; then, the drill bit body 1 is continuously driven to feed, the aperture side blade 10 cuts, the drilling aperture is machined, and the drilling diameter and the drilling precision are ensured to meet the requirements; chips generated during this cutting process are discharged through the spiral groove 9; in addition, the first cutting edge 7 and the second cutting edge 8 are set to be broken line edge surfaces, the outer edge turning point deviates to the rear of the cutting edge, so that the chip sticking part of the cutting edge is always kept at the inner side of the outer edge turning point, and the drilling hole can be effectively prevented from being scratched by the chip sticking of the drill point or the accumulated chips.

The terms "upper", "lower", "outside", "inside", and the like in the description and claims of the present invention and the above-described drawings (if any) are used for distinguishing relative positions without necessarily being construed qualitatively. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the utility model described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The utility model provides a fish tail drill bit is prevented in drilling, its characterized in that, includes drill bit main part (1), drill bit main part (1) includes stalk portion (3) and fixed connection in cutting part (2) of stalk portion (3) front end, be provided with two sections at least cutting edges on cutting part (2), the axis spiral setting of cutting edge along drill bit main part (1), forms helicla flute (9) that row bits were used between the cutting edge, the tip of cutting edge intersects in drill core point (6) department of drill bit main part (1).

2. The drill bit of claim 1, wherein the drill bit body (1) further comprises a transition part (4) arranged at the joint of the blade part (2) and the handle part (3), and a transition fillet I (5) is arranged at the joint of the transition part (4) and the handle part (3).

3. The drill bit according to claim 2, wherein the spiral groove (9) has a concave arc shape in cross section, the spiral groove (9) extends spirally from the drill core tip (6) to the transition part (4), and the depth of the spiral groove (9) is gradually reduced.

4. The drill hole scratch-resistant drill bit as claimed in claim 1, wherein the cutting edge comprises a first cutting edge (7) and a second cutting edge (8) at the drill tip, the first cutting edge (7) and the second cutting edge (8) are connected and arranged in a broken line, the angle of the first cutting edge (7) is 118 °, and the angle of the second cutting edge (8) is not more than 30 °.

5. The drill scratchproof drill bit as claimed in claim 4, characterized in that the ratio of the length of the second cutting edge (8) to the maximum diameter of the blade (2) is approximately equal to 1: 4.

6. The drill anti-scuffing drill bit of claim 1, characterized in that the cutting edge further comprises an aperture side edge (10), a second transition fillet (11) is provided between the aperture side edge (10) and the drill tip, and the edge inclination angle of the aperture side edge (10) is 11 °.

7. The drill hole scratch-resistant drill bit as claimed in claim 6, wherein the aperture side edge (10) comprises an inclined edge surface (12) and a straight edge surface (13), the transition fillet II (11) extends to form the inclined edge surface (12), the big end of the inclined edge surface (12) is connected with the straight edge surface (13), the straight edge surface (13) is connected with a transition part (14), and the diameter of the transition part (14) is equal to that of the straight edge surface (13).