CN217070867U

CN217070867U - Straight flute stepped drill with increased sub-cutting edge

Info

Publication number: CN217070867U
Application number: CN202123021038.1U
Authority: CN
Inventors: 李振丰; 奚旭东; 李晓庆; 张明敏
Original assignee: Suzhou Antima Cutting Tool Technology Co ltd
Current assignee: Suzhou Antima Cutting Tool Technology Co ltd
Priority date: 2021-12-03
Filing date: 2021-12-03
Publication date: 2022-07-29
Anticipated expiration: 2031-12-03

Abstract

A straight flute stepped drill for increasing sub-cutting edge comprises a handle part and a cutting part, wherein the cutting part comprises two cutting edges, and a chip groove is formed between the two cutting edges; the cutting part comprises a drill point, a first edge, a first step angle, a sub-cutting edge zone and a second step angle; the main cutting edge is positioned at the drill point, the auxiliary cutting edge is positioned at the first edge and the sub-cutting edge zone, and the stepped cutting edges are positioned at the first stepped angle and the second stepped angle; the drill tip comprises a first main rear cutter surface and a second main rear cutter surface, and a chip groove is formed corresponding to the second main rear cutter surface; the second edge and the first edge are respectively positioned at two sides of the chip groove; the first step angle is positioned on the first step surface, the second step angle is positioned on the second step surface, and the first step angle is positioned at the front part of the second step angle in the axial direction of the cutter; the sub-cutting edge is positioned between the first stepped surface and the second stepped surface, a sub-cutting edge groove is formed in one side of the sub-cutting edge, and the length of the sub-cutting edge groove is larger than that of the sub-cutting edge. The utility model discloses reduce and twine the bits, reduced the sword risk of shaking, multiplicable coping number of times reduces use cost.

Description

Straight flute stepped drill with increased sub-cutting edge

Technical Field

The utility model relates to a drilling tool technical field, concretely relates to increase straight flute ladder of sub-cutting edge area and bore.

Background

In the metal cutting machining industry, step holes are machined in many parts. Taking an automobile engine cylinder body and a cylinder cover as examples, a plurality of step holes need to be processed, and the demand for the cutter is very large. The unit price of the hard alloy cutter is relatively high, so that a customer often needs to grind the cutter for multiple times to increase the use times of the cutter and reduce the use cost of the cutter.

As shown in fig. 1, the threaded counter bore 22 of the cylinder 21 is formed by connecting a threaded bottom hole 22a with a counter bore hole 22b, and since such holes are processed by a composite drill, the first step is solid drilling and the second step is reaming, so that swarf is likely to occur. And because the hole depth of the counter sink hole 22b is too shallow, the designed second step of the cutter is also limited to be short, so that the grinding times of the cutter are reduced to 1-2 times.

Therefore, how to solve the above-mentioned deficiencies of the prior art is a problem to be solved by the present invention.

Disclosure of Invention

The utility model aims at providing a straight flute ladder of increase sub-margin bores.

In order to achieve the above purpose, the utility model adopts the technical scheme that:

a straight flute stepped drill for increasing sub-cutting edge comprises a handle part and a cutting part, wherein the cutting part comprises two cutting edges, and a chip groove is formed between the two cutting edges;

the cutting edge part comprises a drill point, a first edge, a first step angle, a sub cutting edge zone and a second step angle;

the main cutting edge is positioned at the drill tip, the auxiliary cutting edge is positioned at the first edge and the sub-cutting edge zone, and the stepped cutting edge is positioned at the first stepped angle and the second stepped angle;

the drill tip comprises a first main rear cutter surface and a second main rear cutter surface, wherein a chip groove is formed corresponding to the second main rear cutter surface and is positioned at the front end of the chip groove;

the second edge and the first edge are respectively positioned at two sides of the chip groove;

the first step angle is positioned on a first step surface, the second step angle is positioned on a second step surface, and the first step angle is positioned at the front part of the second step angle in the axial direction of the cutter;

the sub-cutting edge is positioned between the first stepped surface and the second stepped surface, a sub-cutting edge groove is formed in one side of the sub-cutting edge, and the length of the sub-cutting edge groove is larger than that of the sub-cutting edge.

The relevant content in the above technical solution is explained as follows:

1. in the above scheme, the cutting angles of the sub-margin and the second step angle are staggered.

2. In the above scheme, the first main rear cutter face is provided with an inner cooling hole, the inner cooling hole is communicated with a coolant flow channel, and the coolant flow channel is axially arranged in the cutter.

3. In the above scheme, a clearance groove is formed at the joint of the first edge and the first step angle and used for removing a high point at the root of the step.

4. In the scheme, the length of the chip groove is 45-50% of the length of the cutter.

The utility model discloses a theory of operation and advantage as follows:

the utility model relates to a straight flute ladder drill for increasing sub-cutting edge zone, which comprises a handle part and a cutting part, wherein the cutting part comprises two cutting edges, and a chip groove is arranged between the two cutting edges; the cutting part comprises a drill point, a first edge, a first step angle, a sub-cutting edge zone and a second step angle; the main cutting edge is positioned at the drill point, the auxiliary cutting edge is positioned at the first edge and the sub-cutting edge zone, and the stepped cutting edges are positioned at the first stepped angle and the second stepped angle; the drill tip comprises a first main rear cutter surface and a second main rear cutter surface, and a chip groove is formed corresponding to the second main rear cutter surface; the second edge and the first edge are respectively positioned at two sides of the chip groove; the first step angle is positioned on the first step surface, the second step angle is positioned on the second step surface, and the first step angle is positioned at the front part of the second step angle in the axial direction of the cutter; the sub-cutting edge is positioned between the first stepped surface and the second stepped surface, a sub-cutting edge groove is formed in one side of the sub-cutting edge, and the length of the sub-cutting edge groove is larger than that of the sub-cutting edge.

Compared with the prior art, the utility model has the advantages that:

1. by additionally adding the sub-edge groove, the chip containing space and the chip cutting and breaking capacity of the cutter are increased, and the chip winding effect is reduced;

2. the cutting angles of the sub-cutting edge zone and the second step angle are staggered, so that the risk of tool shaking is reduced;

3. through the design of the sub-blade zone, the second stepped grinding frequency is not limited by the length of the first edge any more, grinding can be increased to 7-8 times, and the use cost of the cutter is greatly reduced.

Drawings

FIG. 1 is a schematic sectional view of a workpiece to be machined according to the present invention;

FIG. 2 is a schematic structural diagram of an embodiment of the present invention;

fig. 3 is a schematic structural view of a head according to an embodiment of the present invention;

fig. 4 is a perspective view of an embodiment of the present invention.

In the above drawings: 1. a handle; 2. a blade part; 3. a land; 4. a chip groove; 5. drilling a tip; 6. a first edge; 7. a first step angle; 8. a sub-margin; 9. a second step angle; 10. a first major relief surface; 11. a second major relief surface; 12. a chip pocket; 13. a second edge; 14. a first step surface; 15. a second step surface; 16. a sub-blade groove; 17. an internal cooling hole; 18. a refrigerant flow channel; 19. a clearance groove; 21. a cylinder body; 22. a threaded counter bore; 22a, threaded bottom hole; 22b, counter sink holes.

Detailed Description

The invention will be further described with reference to the following drawings and examples:

example (b): the present disclosure will be described more fully hereinafter with reference to the accompanying drawings, in which embodiments of the disclosure may be shown and described, and which, when modified and varied by the techniques taught herein, can be made by those skilled in the art without departing from the spirit and scope of the disclosure.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The singular forms "a", "an", "the" and "the", as used herein, also include the plural forms.

The terms "first," "second," and the like, as used herein, are not intended to be limited to a particular order or sequence, nor are they intended to be used to limit the scope of the present disclosure, but only to distinguish components or operations described by the same terms.

As used herein, the terms "comprising," "including," "having," and the like are open-ended terms that mean including, but not limited to.

As used herein, the term (terms), unless otherwise indicated, shall generally have the ordinary meaning as commonly understood by one of ordinary skill in the art, in this written description and in the claims. Certain words used to describe the disclosure are discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in describing the disclosure.

The terms "front" and "rear" used herein are directional terms, and are used only for describing the positional relationship between the structures, and are not intended to limit the protection schemes and the actual implementation directions.

Referring to the attached drawings 1-4, the straight flute stepped drill for increasing the sub-cutting edge comprises a shank part 1 and a cutting part 2, wherein the cutting part 2 comprises two cutting edges 3, and a chip groove 4 is arranged between the two cutting edges 3.

The cutting edge part 2 comprises a drill point 5, a first edge 6, a first step angle 7, a sub-cutting edge 8 and a second step angle 9.

The main cutting edge is located at the drill tip 5, the auxiliary cutting edge is located at the first edge 6 and the sub-land 8, and the stepped cutting edge is located at the first step angle 7 and the second step angle 9.

The drill tip 5 comprises a first main rear tool face 10 and a second main rear tool face 11, wherein the second main rear tool face 11 is provided with a chip groove 12, and the chip groove 12 is located at the front end of the chip groove 4. As shown in fig. 3, the tool is rotated counterclockwise during machining.

The chip groove structure further comprises a second edge 13, and the second edge 13 and the first edge 6 are located on two sides of the chip groove 4 respectively. The second edge participates in cutting, provides support during drilling, and can realize better hole wall quality.

The first step angle 7 is located on a first step surface 14, the second step angle 9 is located on a second step surface 15, and the first step angle 7 is located in front of the second step angle 9 in the axial direction of the tool.

The sub-blade 8 is positioned between the first stepped surface 14 and the second stepped surface 15, a sub-blade groove 16 is formed in one side of the sub-blade 8, and the length of the sub-blade groove 16 is greater than that of the sub-blade 8.

The first main flank 10 is provided with an inner cooling hole 17, the inner cooling hole 17 is communicated with a coolant channel 18, and the coolant channel 18 is axially arranged in the cutter.

Preferably, a clearance groove 19 is formed at the connection part of the first edge 6 and the first step angle 7, and is used for removing a high point of the step root.

Preferably, the length of the chip discharge groove 4 is 45-50% of the length of the cutter.

Compared with the prior art, the utility model increases the chip containing space and the chip cutting and breaking capacity of the cutter and reduces the chip winding effect by additionally adding the sub-blade groove; the cutting angles of the sub-cutting edge zone and the second step angle are staggered, so that the risk of tool shaking is reduced; through the design of the sub-blade zone, the second stepped grinding frequency is not limited by the length of the first edge any more, grinding can be increased to 7-8 times, and the use cost of the cutter is greatly reduced.

The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

Claims

1. The utility model provides an increase straight flute ladder of sub-margin and bore which characterized in that:

the cutting edge comprises two cutting edges, and a chip groove is arranged between the two cutting edges;

2. The straight flute stepped drill for increasing sub-margin as set forth in claim 1, wherein: the cutting angles of the sub-margin and the second step angle are staggered.

3. The straight flute stepped drill for increasing sub-margin as set forth in claim 1, wherein: the first main rear cutter face is provided with an inner cooling hole, the inner cooling hole is communicated with a refrigerant flow channel, and the refrigerant flow channel is axially arranged in the cutter.

4. The straight flute stepped drill for increasing sub-margin as set forth in claim 1, wherein: and a clearance groove is formed at the joint of the first edge and the first step angle.

5. The straight flute stepped drill for increasing sub-margin as set forth in claim 1, wherein: the length of the chip groove is 45-50% of the length of the cutter.