CN212682539U

CN212682539U - Annular cutting high-speed steel plate drill bit

Info

Publication number: CN212682539U
Application number: CN202021192539.9U
Authority: CN
Inventors: 夏海甬; 文志民
Original assignee: ZHEJIANG LANGCHAO PRECISION MACHINERY CO Ltd
Current assignee: ZHEJIANG LANGCHAO PRECISION MACHINERY CO Ltd
Priority date: 2020-06-24
Filing date: 2020-06-24
Publication date: 2021-03-12
Anticipated expiration: 2030-06-24

Abstract

The utility model discloses an annular cutting high-speed steel plate drill bit, a plurality of V-shaped cutting points and a plurality of spiral chip grooves are arranged on a cutting part of the annular cutting high-speed steel plate drill bit, each cutting point is provided with two side angles, two relief angles and radial relief angles with different angles, a cylindrical cutting edge is arranged on the outer side of each cutting point, and TiN hard films are coated on the cutting part, the cutting part of the utility model forms a multilayer cutting structure, can obviously improve the cutting speed and the feeding amount and improve the centering effect, the friction force during the cutting of the drill bit can be reduced by the arrangement of the cylindrical cutting edge, the chips generated during the cutting can be smoothly discharged, the arc chip grooves are additionally arranged at the end parts of the spiral chip grooves between the cutting points, the generation of accumulated chips can be reduced during the cutting, the blocking and the edge breaking phenomenon caused by the blocking of iron chips between the cutting edge and the processed material can be avoided, a spring top disc is arranged in the cutting part, the structure, the handle of a knife and output shaft can carry out the direct connection, and the connected mode is more reliable.

Description

Annular cutting high-speed steel plate drill bit

Technical Field

The utility model relates to an annular cutting high-speed steel sheet drill bit.

Background

Patent No. CN2377029Y discloses a multi-edge steel plate drill, which cuts through a plurality of flat tooth blades and sharp tooth blades arranged at the end of a hollow drill body to achieve the purpose of light and fast cutting, but it still has the following disadvantages: the cutting structures of the flat tooth cutting edges and the sharp tooth cutting edges which are arranged at intervals are still single, particularly the two cutting edges are combined for use, the eccentric phenomenon is easy to generate in the cutting process, and the cutting precision is low; in order to smoothly take out materials remained in the drill body after cutting, a sleeve is required to be arranged at the joint of the tool shank and the output shaft, and a spring ejector rod is arranged in the sleeve, so that the joint of the tool shank and the output shaft is too long, the concentricity is not kept easily during cutting, and the connection mode is not reliable enough.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the not enough of above-mentioned prior art, provide an annular cutting high speed steel plate drill bit.

The technical scheme of the utility model is that: the utility model provides a high-speed steel sheet drill bit of annular cutting, includes handle of a knife and the cavity cutting part that has quick interface, a through-hole has on the handle of a knife, the middle part of through-hole and cutting part is linked together, the diameter of through-hole is less than the internal diameter of cutting part, be provided with a plurality of V type cutting tips and a plurality of quantity and position on the cutting part and the corresponding spiral chip groove of cutting tip, each the cutting tip has different both sides angle, two relief angles and radial relief angle of angle, each the outside of cutting tip still has a cylinder land, still the coating has the TiN dura mater on the cutting part, spiral chip groove tip between each cutting tip still has the circular arc chip groove, the junction of through-hole and cutting part inside forms a step, there is a ring body on the step through the fix with screw, be equipped with the top dish that a diameter and cutting part internal diameter correspond in the cutting part, be connected with the spring between top dish and the ring, the middle part of the ring body is also fixed with a check valve, and the periphery of the top disc is also provided with a plurality of arc-shaped grooves corresponding to the cutting tips in an array manner.

Preferably, the angle of each of the two side angles of the cutting tip is 10 to 35 °, the angle of each of the two back angles of the cutting tip is 5 to 15 °, and the angle of the radial back angle is 5 to 15 °.

Preferably, the width of the cylindrical blade 7 is 0.2-1 mm.

Preferably, the thickness of the TiN hard film is 2 um.

Preferably, the spiral angle of the spiral chip groove is 15-40 degrees, and the wall thickness of the spiral chip groove is 0.5-1.5 mm.

Further, the periphery of the top disc is ground into an arc shape.

The utility model has the advantages that: the utility model discloses a cutting portion forms multilayer cutting structure, can show promotion cutting speed, the feed volume, and improve centering effect, the frictional force when cylinder land sets up the reducible drill bit cutting, and the piece that produces when making the cutting can discharge smoothly, circular arc chip groove is add to spiral chip groove tip between each cutting point, the production of long-pending bits tumour can be reduced during the cutting, avoid the iron fillings card to stop and the tipping phenomenon at the sword with the card that arouses in the middle of by the processing material, built-in spring top plate in the cutting portion, the structure is more simple and compact, handle of a knife and output shaft can directly link up, the connected mode is more reliable.

Drawings

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

FIG. 2 is a tooth profile of the cutting tip of the present invention;

fig. 3 is a left side view of the present invention;

fig. 4 is a cross-sectional view of the present invention;

fig. 5 is a schematic structural diagram of the top plate of the present invention.

Detailed Description

The technical solution of the present invention is further specifically described below by way of examples and with reference to the accompanying drawings.

As shown in fig. 1, the annular cutting high-speed steel plate drill comprises a tool shank 2 with a quick connector 1 and a hollow cutting part 3, wherein the tool shank 2 is provided with a through hole 4, the through hole 4 is communicated with the middle part of the cutting part 3, and the diameter of the through hole 4 is smaller than the inner diameter of the cutting part 3;

the cutting part 3 is provided with a plurality of V-shaped cutting tips 5 and a plurality of spiral chip grooves 6 corresponding to the cutting tips 5 in number and position;

referring to fig. 2 and 3, the angles on both sides of each cutting tip 5 are named as a and a1, the angles of a and a1 are 10-35 °, the angles of two clearance angles of each cutting tip 5 are named as b and b1, the angles of b and b1 are 5-15 °, the outer side of each cutting tip 5 is further provided with a cylindrical land 7, the width of the cylindrical land 7 is 0.2-1 mm, the cutting tip 5 is further provided with a radial clearance angle f, the angle of the radial clearance angle f is 5-15 °, and the angles are arranged, so that the cutting part 3 of the present invention forms a multi-layer cutting structure, the cutting speed and the feeding amount can be remarkably improved, the centering effect can be improved, the arrangement of the cylindrical land 7 can reduce the friction force of a drill during cutting, and chips generated during cutting can be smoothly discharged;

the cutting part 3 is also coated with TiN hard films by utilizing a nano vacuum composite ion plating process, the thickness is 2um, the hardness of the TiN hard films can reach 2200HV, the thermal stability is high, the friction factor with steel is low, the cutting efficiency of the cutting part 3 can be further improved, and the service life of a drill bit is prolonged;

the spiral angle of the spiral chip groove 6 is 15-40 degrees, the wall thickness of the spiral chip groove 6 is 0.5-1.5 mm, the surface is of a fully-ground structure, and chips can be discharged more easily and smoothly; the end part of the spiral chip groove 6 between the cutting tips 5 is also provided with an arc chip groove 8, so that the generation of chip accumulation can be reduced during drilling, and the phenomena of clamping stop and tipping caused by the fact that scrap iron is clamped between the blade and a processed material are avoided;

as shown in fig. 4 and 5, a step is formed at the connection position between the through hole 4 and the inside of the cutting part 3, a ring body 9 is fixed on the step through a screw, a top disc 10 with a diameter corresponding to the inner diameter of the cutting part 3 is arranged in the cutting part 3, a spring 11 is connected between the top disc 10 and the ring body 9, when the drill bit drills through the processed material, the material in the cutting part 3 can be ejected by the spring 11, compared with the prior art in which an ejector rod and a sleeve structure are required to be arranged at the rear end of the tool holder 2, the utility model has the advantages of simpler and more compact structure, the tool holder 2 and the output shaft can be directly connected, and the connection mode is more reliable;

in order to ensure the smooth sliding of the top disc 10 in the cutting part 3, the periphery of the top disc 10 is ground into an arc shape;

a check valve 12 is fixed in the middle of the ring body 9, and when the cooling liquid is used for cooling the inside of the cutting part 3 and the cutting tip 5 through the through hole 4 of the cutter handle 2, the check valve 12 can prevent dust generated by cutting from entering the through hole 4 to cause blockage; in order to ensure that the coolant can smoothly reach the cutting tips 5, the outer periphery of the top disk 10 is further arrayed with a plurality of arc-shaped grooves 13 corresponding to the cutting tips 5.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a high-speed steel sheet drill bit of annular cutting, is including handle of a knife and the cavity cutting portion that has quick interface, a through-hole has on the handle of a knife, the middle part of through-hole and cutting portion is linked together, the diameter of through-hole is less than the internal diameter of cutting portion, its characterized in that: the cutting part is provided with a plurality of V-shaped cutting tips and a plurality of quantity and positions and spiral chip grooves corresponding to the cutting tips, each cutting tip is provided with two side angles, two relief angles and radial relief angles with different angles, each cutting tip outside is provided with a cylindrical cutting edge, the cutting part is coated with a TiN hard film, the end part of the spiral chip groove between the cutting tips is provided with an arc chip groove, the connecting part between the through hole and the inside of the cutting part forms a step, the step is fixed with a ring body through a screw, a top disc with the diameter corresponding to the inner diameter of the cutting part is arranged in the cutting part, a spring is connected between the top disc and the ring body, the middle part of the ring body is fixed with a check valve, and the periphery of the top disc is provided with a plurality of arc grooves corresponding to the cutting tips in an array mode.

2. The annular cutting high speed steel plate drill bit of claim 1, wherein: the angle of each of the two side angles of the cutting tip is 10-35 °, the angle of each of the two back angles of the cutting tip is 5-15 °, and the angle of the radial back angle is 5-15 °.

3. The annular cutting high speed steel plate drill bit of claim 2, wherein: the width of the cylindrical blade zone (7) is 0.2-1 mm.

4. The annular cutting high speed steel plate drill bit of claim 3, wherein: the thickness of the TiN hard film is 2 um.

5. The annular cutting high speed steel plate drill bit of claim 4, wherein: the spiral angle of the spiral chip groove is 15-40 degrees, and the wall thickness of the spiral chip groove is 0.5-1.5 mm.

6. The annular cutting high speed steel plate drill bit of claim 5, wherein: the periphery of the top disc is ground into an arc shape.