CN210587327U

CN210587327U - Replaceable drilling blade

Info

Publication number: CN210587327U
Application number: CN201921495851.2U
Authority: CN
Inventors: 侯雅旻; 韩飞
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-09-10
Filing date: 2019-09-10
Publication date: 2020-05-22
Anticipated expiration: 2029-09-10

Abstract

The utility model discloses a removable formula drilling blade, including drill point back angle face, chip pocket, chip groove and screw thread blind hole, drill point back angle face forms a central chisel edge of constituteing by two space curved surfaces in drill point center department, the chip pocket is located the side of drill point back angle face, the bilateral symmetry of drill point back angle face is provided with two margins, the bottom of drill point back angle face is connected with the bottom surface locating surface, the inside at drill point back angle face is seted up to the screw thread blind hole, the side of drill point back angle face is provided with interconnect's circumference clamping face and circumference locating surface, the central line of screw thread blind hole is axis I, the central line of drill point back angle face is axis II. The utility model improves the centering effect of the drill bit while ensuring the strength of the central chisel edge; and through the special design of the rake angle of the chip groove, the scrap iron can be discharged out of the processing area quickly and reliably, the service life of the drill bit is obviously prolonged, and the surface quality of the processed hole is obviously improved.

Description

Replaceable drilling blade

Technical Field

The utility model relates to a cutting equipment technical field specifically is a removable formula drilling blade.

Background

The existing rotary support parts and heat dissipation plate parts made of manganese steel, chromium molybdenum steel, stainless steel and the like need to be processed in a large amount by adopting the cutting mode.

The machining has high requirements on the cutting efficiency of the cutter and the quality of the machined hole. At present, China mainly depends on imported cutters in the field. The entry cost of such drilling inserts is extremely high and also has the following disadvantages: the blade zone is easy to break in the cutting process and the hole wall extrusion process; (II) the front cutter face of the cutter groove is quickly abraded and unsmooth in the chip removal process; and thirdly, the chisel edge is too thin to bear the extrusion force generated by the drill point and the workpiece during centering for a long time. These three points result in a conventional imported drill insert having a relatively low process life and a very high cost per hole.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a removable formula drilling blade to solve the drilling blade process life of the traditional import on the existing market that above-mentioned background art provided and lower, the high problem of haplopore cost.

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a removable formula drilling blade, includes drill point back angle face, chip pocket, chip groove and screw thread blind hole, drill point back angle face forms a central chisel edge of constituteing by two space curved surfaces in drill point center department, the chip pocket is located the side of drill point back angle face, and the crossing department of chip pocket and drill point back angle face forms blade I, the chip pocket is located the side of drill point back angle face, and the crossing department of chip pocket and drill point back angle face forms blade II, the bilateral symmetry of drill point back angle face is provided with two bandeaks, the bottom of drill point back angle face is connected with the bottom surface locating surface, the screw thread blind hole is seted up in the inside of drill point back angle face, the side of drill point back angle face is provided with interconnect's circumference clamping surface and circumference locating surface, the central line of screw thread blind hole is axis I, the central line of drill point back angle face is axis II.

Preferably, the plane of the drill point rear angle surface is a surface A, all straight lines on the surface A are perpendicular to the axis II, the side surface adjacent to the drill point rear angle surface is a surface B, all straight lines on the surface B are parallel to the axis II, and the projection angle (gamma) of the surface A on the surface B is 7 degrees.

Preferably, an included angle (β) between an edge I formed by the intersection of the chip flute and the drill tip back angle surface and an edge II formed by the intersection of the chip discharge flute (3) and the drill tip back angle surface is between 170 and 175 degrees.

Preferably, the rake angle (α 1) at the intersection of the flutes (3) and the drill tip relief surface is 0 ° and increases gradually along the axial rake angle α 1< α 2< α 3.

Preferably, the axis I of the blind threaded hole coincides with the axis II of the back angle surface of the drill point, the blind threaded hole is vertical to the bottom positioning surface, and the cutting edge is symmetrical relative to the axis I.

Preferably, the included angle between the circumferential clamping surface and the circumferential positioning surface is 155 degrees, and the circumferential clamping surface and the circumferential positioning surface are perpendicular to the bottom surface positioning surface.

Compared with the prior art, the beneficial effects of the utility model are that: the replaceable drill insert:

the arc-shaped center chisel edge has high strength on the premise of good centering capacity, an included angle (β) formed by the main cutting edge disperses the application direction of cutting force in the circumferential direction, so that the cutting is more stable, the front angle of the cutter groove is gradually changed along the axial direction, so that the uniform stress of the zero-degree front angle of the main cutting edge is ensured, and the chip removal space and the chip removal direction are ensured, so that the chip removal is smooth and reliable.

Drawings

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

FIG. 2 is a schematic diagram of the pre-processing structure of the drill tip and the processed part of the rear corner face of the drill tip of the present invention;

FIG. 3 is a schematic view of the β corner structure of the back corner face of the drill tip of the present invention;

fig. 4 is a schematic view of the progressive increase of the rake angles α 1, α 2, and α 3 of the back rake face of the drill tip of the present invention.

In the figure: 1. drill point back corner face, 2 chip pocket, 3 chip groove, 4 chip zone, 5 bottom surface locating face, 6 thread blind hole, 7 circumference clamping face, 8 circumference locating face, 9 center chisel edge, 10 cutting edge I, 11 cutting edge II, 12 axis I, 13 axis II.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-4, the present invention provides a replaceable drilling insert, comprising a drill point rear corner face 1, a chip pocket 2, a chip pocket 3, a land 4, a bottom positioning face 5, a threaded blind hole 6, a circumferential clamping face 7, a circumferential positioning face 8, a central chisel edge 9, a cutting edge i 10, a cutting edge ii 11, an axis i 12 and an axis ii 13, wherein the drill point rear corner face 1 forms a central chisel edge 9 composed of two space curved surfaces at the drill point center, the plane of the drill point rear corner face 1 is the plane a, all straight lines on the plane a are mutually perpendicular to the axis ii 13, the side face adjacent to the drill point rear corner face 1 is the plane B, all straight lines on the plane B are parallel to the axis ii 13, the projection angle (γ) of the plane a on the plane B is 7 °, the chip pocket 2 is located on the side face of the drill point rear corner face 1, the chip pocket 2 and the drill point rear corner face 1 form a cutting edge 10, the cutting edge i 2 and the drill point rear corner face 1 are mutually perpendicular to the drill point rear corner face 6, the drill point positioning face 11, the central line of the drill point rear corner face 1 is connected to the drill point 6, the drill point rear corner face 35, the drill point rear corner face is connected to the drill point 6, the drill point rear corner face 35, the drill point 6, the drill point corner face 35 is connected to the drill point 6, the drill point rear corner face 35 is connected to the drill point corner face 367, the drill point 6, the drill point rear corner face is connected to the drill point 6, the drill point 6 is connected to the drill point 6, the drill point rear corner face is connected to the drill point 6, the drill point 6 is connected to the drill point 6.

The working principle is as follows: the center of drill point can be by two tangent space curved surfaces central chisel edge 9 on the arc central axis of formation, this central chisel edge 9 can be at first by the processing part surface formation hemisphere locating surface at the drilling in-process, different with traditional linear type or point type chisel edge, this arc central chisel edge 9 makes the extrusion force evenly distributed of work piece to drill bit central chisel edge 9 department on whole piece central chisel edge 9, and the atress direction prolongs the directional sphere center of sphere direction, the stability of centering has been guaranteed, stress concentration has been avoided, when the function of drilling blade centering has been guaranteed, make the intensity of central chisel edge 9 increase by a wide margin.

In some embodiments, the included angle (β) formed by the cutting edges I10 and II 11 enables the cutting force to be dispersed in two directions in the axial direction during drilling, and avoids the problem of edge breakage caused by the cutting force concentrated on a certain section of the main cutting edge of the drill point.

In some embodiments, the radial rake angle of the cutting edge ii 11 formed by the chip groove 3 and the drill tip back rake surface 1 is 0 °, so that the cutting force on the cutting edge is uniformly distributed, stress concentration is avoided, and meanwhile, the radial rake angle of the chip groove 3 is gradually increased in the process of being away from the drill tip along the axis direction, so that the chip removal space of the chip groove 3 is increased, the discharge direction of the iron chips is also corrected, and the iron chips are guided to be rapidly discharged out of the processing area.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.

Claims

1. The utility model provides a removable formula drilling blade, includes drill point back corner face (1), chip groove (2), chip groove (3) and screw thread blind hole (6), its characterized in that: the drill point rear corner face (1) forms a central chisel edge (9) composed of two space curved surfaces at the center of the drill point, the chip groove (2) is positioned at the side of the drill point rear corner face (1), the intersection of the chip groove (2) and the drill point rear corner face (1) forms a cutting edge I (10), the chip groove (3) is positioned at the side of the drill point rear corner face (1), the intersection of the chip groove (3) and the drill point rear corner face (1) forms a cutting edge II (11), two cutting edge strips (4) are symmetrically arranged at two sides of the drill point rear corner face (1), the bottom of the drill point rear corner face (1) is connected with a bottom surface positioning face (5), the thread blind hole (6) is arranged inside the drill point rear corner face (1), the side of the drill point rear corner face (1) is provided with a circumferential clamping face (7) and a circumferential positioning face (8) which are connected with each other, and the central line of the thread blind hole (6) is an axis I (12), the center line of the drill point rear corner surface (1) is an axis II (13).

2. A replaceable drill insert as claimed in claim 1 wherein: the plane of the drill point rear angle surface (1) is an A surface, all straight lines on the A surface are perpendicular to the axis II (13), the side surface adjacent to the drill point rear angle surface (1) is a B surface, all straight lines on the B surface are parallel to the axis II (13), and the projection angle (gamma) of the A surface on the B surface is 7 degrees.

3. The replaceable drill insert as claimed in claim 1, wherein the cutting edge i (10) formed by the intersection of the chip flute (2) and the drill tip rear corner face (1) and the cutting edge ii (11) formed by the intersection of the chip flute (3) and the drill tip rear corner face (1) form an included angle (β) of between 170 ° and 175 °.

4. The replaceable drilling insert according to claim 1, wherein the flute (3) has a rake angle (α 1) at the intersection with the drill tip relief surface (1) of 0 ° and a gradual increase in axial rake angle of α 1< α 2< α 3.

5. A replaceable drill insert as claimed in claim 1 wherein: the axis I (12) of the threaded blind hole (6) is superposed with the axis II (13) of the drill point rear corner face (1), the threaded blind hole is vertical to the bottom locating face (5), and the cutting edge (4) is symmetrical relative to the axis I (12).

6. A replaceable drill insert as claimed in claim 1 wherein: an included angle between the circumferential clamping surface (7) and the circumferential positioning surface (8) is 155 degrees, and the circumferential clamping surface (7) and the circumferential positioning surface (8) are perpendicular to the bottom surface positioning surface (5).