CN111730111A

CN111730111A - Twist drill with alloy tool bit

Info

Publication number: CN111730111A
Application number: CN202010428158.4A
Authority: CN
Inventors: 王艾泉; 张建华; 其他发明人请求不公开姓名
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-05-17
Filing date: 2020-05-17
Publication date: 2020-10-02

Abstract

The invention provides a twist drill with an alloy cutter head, which mainly relates to a drilling cutter for machining, and has the advantages of strong stability, high heat dissipation efficiency, long service life and easy positioning during drilling and machining.

Description

Twist drill with alloy tool bit

The technical field is as follows:

the invention relates to an alloy bit twist drill which is used for drilling and milling processes of machining and maintenance of fitters, the new machining theory considers that the cutting efficiency of a segmented step-shaped cutting edge is high, and when the step-shaped cutting edge is gradually prolonged, the effect is obviously reduced until the effect disappears, so that the theory is still not a true correct theory.

Background art:

at present, a drilling tool used in machining comprises a chisel edge, a cutting edge, a spiral cutting edge and a side edge, wherein the cutting edge is arranged on a spiral cutting surface and is of a single same-position cutting structure, the cutting edge is in a centrifugal force transmission range of rotary cutting, the cutting edge is simultaneously subjected to rotary cutting force and transmission force of which the center is outward, the cutting edge at the intersection of the cutting edge and the spiral cutting edge is always extremely easy to damage under the action of double forces, the existing drilling tool generates a swinging phenomenon due to the fact that the structure is not absolutely balanced during drilling, the spiral cutting surface and the spiral cutting edge are damaged due to the fact that the tool is stabilized by the spiral cutting surface, the general understanding is that the smoother and higher the strength of the surface is obtained, the new theory is that the strength of the surface with micro gaps is higher, and the essential structural characteristics of substances are not disclosed, so that the existing drilling tool is low in efficiency, and the drilling precision is poor.

The invention content is as follows:

the present invention has been made in view of the above problems, and it is an object of the present invention to provide a twist drill with an alloy bit, which has a function of blocking a conductive force, is high in heat dissipation efficiency, high in strength, long in life, easy to position during drilling, and high in drilling accuracy, and it is widely known that the smoother surface is, the higher strength is, the surface of a surface with a small gap, and the intrinsic structural characteristics of a material are not disclosed, in the case that two solid bodies have the same volume, the surface area of a dispersed small-volume solid is larger than that of an integrated solid body, even diamond is broken when the integrated structure of a solid body reaches a certain volume limit, and the sum of the stress strength of the small-volume solid bodies is much larger than that of the integrated solid body under a volume stress, and experiments prove that the twist drill is used in a cutting tool in a, the millimeter-scale twist drill has the most obvious high-strength characteristic, namely millimeter strength, and is applied to the twist drill with the alloy cutter head.

In order to achieve the purpose, the invention adopts the following technical scheme:

a twist drill with alloy bit is composed of a handle, spiral cutters and alloy bit, and features that at least two spiral cutters are integrally arranged on the twist drill with alloy bit, the spiral cutting surface is formed on the surface of each spiral cutter facing to cutting direction, the spiral cutting surface is the spiral auxiliary cutting surface on the external surface of spiral cutting surface, the spiral cutting surface is crossed with the spiral auxiliary cutting surface to form spiral cutting edge, the back surface of spiral cutting surface is the back cutting surface, the transverse or sharp edges are formed on the back cutting surfaces, the cutting edges are formed on the back cutting surface, and the side edges are formed on the back cutting surface,

the method is characterized in that: the alloy bit twist drill integrally comprises a cutter handle and spiral cutters, wherein the front end spiral cutting surfaces of at least two spiral cutters are milled with grooves and integrally or connected and integrally provided with one alloy bit, the alloy bit is integrally provided with two cutting surfaces facing the front end of the rotation direction along the axial center of the alloy bit twist drill, the spiral cutting surfaces at two sides of the integrally provided two spiral cutters and the two cutting surfaces integrally provided with the alloy bit are respectively arranged with the grooves, the spiral cutting edges extend to the alloy bit to form auxiliary cutting edges, and the spiral auxiliary cutting surfaces extend to the alloy bit to form auxiliary cutting surfaces;

and the alloy tool bit cutting surface of the alloy tool bit twist drill starting to the axial center direction along the spiral cutting edge on the outer periphery of the alloy tool bit is concavely provided with a micro-section with millimeter strength; a micro-strengthening stress extension table with millimeter strength is formed on the inner side of the micro-section of the alloy tool bit of the twist drill with the alloy tool bit in a protruding manner; the micro-cutting surface with millimeter strength is intersected with the auxiliary cutting surface on the outer periphery to form a micro-cutting edge with millimeter strength; the micro-section with millimeter strength and the rear cutting surface are intersected to form a cutting micro-blade with millimeter strength; the micro-reinforcing stress extension table with millimeter strength is intersected with the rear cutting surface to form a side micro-blade with millimeter strength.

A twist drill with alloy bit is composed of a handle, spiral cutters and alloy bit, and features that at least two spiral cutters are integrally arranged on the twist drill with alloy bit, the spiral cutting surface is formed on the surface of each spiral cutter facing to cutting direction, the spiral cutting surface is the spiral auxiliary cutting surface on the external surface of spiral cutting surface, the spiral cutting surface is crossed with the spiral auxiliary cutting surface to form spiral cutting edge, the back surface of spiral cutting surface is the back cutting surface, the transverse edges are formed on the back cutting surfaces, the cutting edges are formed on the back cutting surfaces, and the side edges are formed on the back cutting surface,

the method is characterized in that: the alloy cutter head twist drill integrally comprises a cutter handle and spiral cutter bodies, wherein the front end spiral cutting surfaces of at least two spiral cutter bodies are milled with grooves and integrally or connected and integrally provided with an alloy cutter head, the alloy cutter head is integrally provided with two cutting surfaces facing the front end of the rotation direction along the axial center of the alloy cutter head twist drill, the spiral cutting surfaces at two sides of the integrally provided two spiral cutter bodies and the two cutting surfaces integrally provided with the alloy cutter head are respectively arranged with the grooves, the spiral cutting edges extend to the alloy cutter head to form auxiliary cutting edges, and the spiral auxiliary cutting surfaces extend to the alloy cutter head to form auxiliary cutting surfaces;

the alloy tool bit of the alloy tool bit twist drill is integrally or connected and integrally arranged, and a central step with millimeter strength is erected on the cutting surface of the alloy tool bit twist drill near the axial center on the inner side of the cutting surface of the alloy tool bit; the inner side of the central step platform with millimeter strength is provided with a central step surface which is convex towards the rotating direction; the alloy tool bit twist drill is characterized in that a central step platform with millimeter strength on the alloy tool bit of the alloy tool bit twist drill is intersected with a rear cutting surface to form a side micro blade with millimeter strength; the alloy cutter head is provided with a central step platform with millimeter strength and a central step surface with millimeter strength which are intersected to form a central blade with millimeter strength; the width of the central stepped surface on the alloy cutter head is less than or equal to one third of the radius of the twist drill with the alloy cutter head.

the alloy tool bit of the alloy tool bit twist drill is integrally or connected and integrally arranged, and a hole dividing table with millimeter strength is arranged on a cutting surface of a secondary cutting edge from the axial center to the outer periphery of the alloy tool bit twist drill in a stepped concave manner; the cutting surface protruding from the inner side of the hole dividing table with millimeter strength is a dividing surface, and the dividing surface is intersected with the rear cutting surface to form a cutting edge; the hole dividing table with millimeter strength is intersected with the rear cutting surface to form a side micro blade with millimeter strength; the top of the hole dividing table with millimeter strength on the alloy cutter head is intersected with the cutting surface of the inner side bulge to form a dividing cutting edge with millimeter strength; the width of the sectioning surface of the alloy cutter head is more than or equal to one third of the radius of the twist drill with the alloy cutter head and less than or equal to two thirds of the radius of the twist drill with the alloy cutter head.

Preferably, at least one or more notch edges are provided on the alloy bit cutting edge of the alloy bit twist drill; each of the recessed edges extends toward the rear cutting face to form a recess.

Preferably, at least one or more stages of rising steps and at least one or more stages of protruding rear cutting surfaces are arranged on the rear cutting surface where the alloy bit of the twist drill with the alloy bit is located in a manner that the height of the rear cutting surface in the outer side edge direction from the axial center is reduced, the rising steps and the cutting surface at the front end in the rotation direction intersect to form at least one or more stages of rising step edges, and the at least one or more stages of protruding rear cutting surfaces and the cutting surface at the front end in the rotation direction intersect to form at least one or more stages of protruding cutting edges.

Preferably, at least one or more steps and at least one or more raised rear cutting surfaces are arranged on the rear cutting surface of the alloy bit twist drill starting from the axial center in a manner that the height of the rear cutting surface in the direction of the outer side edge is reduced, the at least one or more steps and the cutting surface at the front end in the rotation direction intersect to form at least one or more steps and the at least one or more raised rear cutting surfaces and the cutting surface intersect to form at least one or more raised cutting edges; and at least one or more notch edges are arranged on the stepped cutting edge of the alloy cutter head with at least one or more steps, and each notch edge extends towards the rear cutting surface to form a groove.

Preferably, chamfer surfaces, chamfer edges and chisel edges are formed on the rear cutting surfaces on the two sides of the front end of the alloy bit of the twist drill with the alloy bit in an intersecting manner at the axial center; or the rear cutting surfaces on the two sides of the front end of the alloy tool bit of the twist drill with the alloy tool bit are intersected at the axial center to form a chamfer surface, a chamfer edge and a sharp edge without a chisel edge.

Preferably, cooling holes are integrally provided in the cutter shank and the spiral cutter body of the alloy-tipped twist drill.

Preferably, the included angle formed by the cutting edge at the outermost side of the alloy bit of the twist drill with the alloy bit and the spiral auxiliary cutting edge is an acute angle; or the included angle formed by the cutting edge at the outermost side of the alloy tool bit of the twist drill with the alloy tool bit and the spiral auxiliary cutting edge is a right angle; or the included angle formed by the cutting edge at the outermost side of the alloy tool bit of the twist drill with the alloy tool bit and the spiral auxiliary cutting edge is an obtuse angle.

Preferably, the tool handle of the twist drill with the alloy tool bit is a straight handle; or the cutter handle of the twist drill with the alloy cutter head is a taper handle.

Has the advantages that:

in the contrast experiment that goes on the drilling machine, use the fluted drill of diameter 10.15 as the experiment, be the cobalt-containing high-speed steel of M35 together, thermal treatment simultaneously, with batch production, the drilling object is the gear finish turning processing price of forging quenching and tempering, drilling depth 35mm, the blind hole, under the fluted drill rotational speed and the amount of feed of ordinary structure reached the limit, alloy tool bit fluted drill can also improve rotational speed 25%, improve the amount of feed 25%, comprehensive drilling efficiency improves more than the one time, the drilling quantity alloy tool bit fluted drill increases more than the fluted drill of ordinary structure by three times.

Description of the drawings:

the technical solutions and advantages of the present invention will be described in detail by referring to the accompanying drawings, in which:

fig. 1 is a schematic view of a twist drill with alloy tips according to a first embodiment of the present invention.

Fig. 2 is a schematic view of a twist drill with alloy tips according to a second embodiment of the present invention.

Fig. 3 is a schematic view of a twist drill with alloy tips according to a third embodiment of the present invention.

Fig. 4-5 are schematic diagrams of combined applications of the alloy-bit twist drill according to the first to third embodiments of the present invention.

The specific implementation mode is as follows:

preferred embodiments of the alloy-tipped twist drill of the present invention will be described in detail below with reference to the accompanying drawings, and embodiments 1 to 3 will be mainly described by taking as an example a tool in which the alloy-tipped twist drill integrally has two helical blades.

Embodiment 1:

as shown in fig. 1, an alloy-bit twist drill 1 according to a first embodiment of the present invention, and a drilling tool for machining, are mainly composed of a tool shank (not shown) including a taper shank or a straight shank and helical cutters 4, at least two helical cutters 4 are formed integrally with or coupled to each other and have grooves milled in their front helical cutting surfaces, an alloy bit 31 is integrally formed with the alloy bit 31 along an axial center of the alloy-bit twist drill 1 to have a cutting surface 13 facing a front end in a rotational direction, and the helical cutting surfaces 13 of the two helical cutters 4 are respectively provided in the same groove as the two cutting surfaces 13 of the alloy bit 31;

the alloy bit twist drill 1 is integrally provided with two spiral cutter bodies 4, the surface of the alloy bit 31 of each spiral cutter body 4 facing the cutting direction is formed into a cutting surface 13, the surface of the outer side of the cutting surface 13 facing backwards in the rotating direction is a secondary cutting surface 8, the cutting surface 13 intersects with the secondary cutting surface 8 to form a spiral cutting edge, the surface of the axial front end back side of the cutting surface 13 is formed into a rear cutting surface 5, rear cutting surfaces on at least two sides intersect to form a chisel edge, chamfers 22 and chamfer edges 2 are formed at two end chamfers of the chisel edge, a cutting edge 6 is formed by the intersection of the cutting surface 13 and the rear cutting surface 5, a side edge 7 is formed by the intersection of the secondary cutting surface 8 and the rear cutting surface 5, the spiral cutting edge extends to the alloy bit 31 to form a secondary cutting edge, the spiral secondary cutting surface 8 extends to the alloy bit 31 to form a secondary cutting surface 8 of the alloy bit 31, or protrudes from the secondary cutting surface 8 of the alloy bit 31 to the spiral cutting surface;

the micro-tangent plane 18 with millimeter strength is concavely arranged on the cutting surface 13 of the alloy cutter head 31 in the axial center direction from the spiral cutting edge 17 on the outer periphery of the alloy cutter head 31 on the twist drill 1 with the alloy cutter head; a micro-strengthening stress extension table 20 with millimeter strength is formed by erecting the inner side of the micro-section 18 of the alloy tool bit 31 of the twist drill 1 with the alloy tool bit; the micro-cutting surface 18 with millimeter strength and the secondary cutting surface 8 of the outer periphery are intersected to form a micro-cutting edge 17 with millimeter strength; the alloy tool bit 31 is provided with a millimeter-strength micro-cutting surface 18 which is intersected with the rear cutting surface 5 to form a millimeter-strength cutting micro-blade 16; the micro-strengthening stress extension platform 20 with millimeter strength on the alloy tool bit 31 is intersected with the rear cutting surface 5 to form a side micro-blade 19 with millimeter strength.

The arrangement is equivalent to drilling a process hole and then drilling, because the micro-reinforced stress extending platform 20 with millimeter strength is arranged to enhance the strength of the micro-section 18 with millimeter strength, and the micro-section 18 with millimeter strength has the characteristic of small composite and strong strength because the area is reduced, the micro-section is characterized in that the average strength of one side surface of the micro-section in millimeter scale is larger than the centimeter scale, the centimeter scale is larger than the decimeter scale, 1 cubic centimeter is 1 kilocubic millimeter, the area is the surface area of 1 cubic centimeter and 6 hundred square millimeters, the surface area of 1 thousand cubic millimeters is 6 thousand square millimeters, the surface area of 1 cubic centimeter is one tenth of the surface area of 1 thousand cubic millimeters according to the volume average applied force, therefore, the millimeter-scale bearing pressure limit is far larger than the centimeter scale, and the force extended by the spiral micro-reinforced stress extending platform 20 with millimeter strength is added, the micro-section support structure has the effect of supporting and strengthening the strength of the micro-section 18 with millimeter strength, so that the micro-section support structure is arranged on the same cutter and has high strength and stability, and compared with a common reamer, the micro-section support structure has the advantages of being more durable and stable in strength cutting edge degree, and therefore the micro-section support structure has the advantage of high efficiency and is higher in drilling precision.

According to the above structure, since the drilling cutting is a circular motion, a centrifugal force is generated in the circular motion process, the cutting edge 6 forms a transmission carrier of the centrifugal force, the cutting edge 6 is separated by the cutting surface 13 and the adjacent spiral micro-reinforced stress extension table 16, the micro-cutting edge 17 and the side micro-cutting edge 19 formed by the intersection of the micro-cutting surface 18 with millimeter strength and the rear cutting surface, the cutting edge 6 is separated by the side micro-cutting edge 19 and the micro-reinforced stress extension table 20, the cutting force is differentiated, the overall cutting force is reduced, the stress action of the micro-cutting edge 17 and the inner cutting edge 6 of the outer side cutting surface, namely the micro-cutting surface 18 and the rear cutting surface, is reduced to the maximum extent, the temperature of the alloy cutter head 3131 is reduced, the stress of the outer end cutting edge which is most vulnerable to the cutter is decomposed, the service life of the cutter is prolonged, and the high strength is.

In the contrast experiment that goes on the drilling machine, use the fluted drill of diameter 10.5 as the experiment, be the cobalt-containing high-speed steel of M35 together, thermal treatment simultaneously, same batch production, the drilling object is the gear finish turning processing price of forging quenching and tempering, drilling depth 35mm, the blind hole, alloy tool bit fluted drill 1's tangent plane 18 width 1.5mm a little, the height of micro-strengthening stress extension platform 20 is 0.6mm, under the condition that fluted drill rotational speed and the amount of feed of common structure reached the limit, alloy tool bit fluted drill 1 can also improve the rotational speed 25%, improve 25% of the amount of feed, comprehensive drilling efficiency improves 0.56 times, alloy fluted drill drilling 526 of common structure, alloy tool bit fluted drill 1 drills 4316, the drilling quantity alloy tool bit fluted drill 1 increases seven times more than the fluted drill of common structure.

According to the experimental result, the service efficiency and the service life of the twist drill are obviously greatly improved, and the structure is proved to be an effective mode for prolonging the service life and improving the efficiency.

Embodiment 2:

as shown in fig. 2, an alloy-tipped twist drill 1 according to a second embodiment of the present invention, which is a combined use of the first embodiment, relates to a drilling tool for machining, and is composed of a tool shank (not shown) including a taper shank or a straight shank and helical blades 4, at least two helical blades 4 having front end helical cutting surfaces on which grooves are milled and integrally or coupled and integrally provided with an alloy tip 31, the alloy tip 31 integrally provided with a cutting surface 13 facing the front end in the rotational direction along the axial center of the alloy-tipped twist drill 1, and two helical cutting surfaces 13 of the two helical blades 4 integrally provided with the alloy tip 31, respectively, being provided with grooves;

the alloy bit twist drill 1 is integrally provided with two spiral cutter bodies 4, a cutting surface 13 is formed on the surface of an alloy bit 31 of each spiral cutter body 4 facing the cutting direction, a secondary cutting surface 8 is formed on the surface of the outer side of the cutting surface 13 facing backwards in the rotating direction, a spiral cutting edge is formed by the intersection of the cutting surface 13 and the secondary cutting surface 8, a rear cutting surface 5 is formed on the surface of the axial front end back side of the cutting surface 13, a chisel edge is formed by the intersection of at least two rear cutting surfaces on two sides, a chamfer surface 22 and a chamfer edge 2 are formed on the chamfer of two ends of the chisel edge, a cutting edge 6 is formed by the intersection of the cutting surface 13 and the rear cutting surface 5, a side edge 7 is formed by the intersection of the secondary cutting surface 8 and the rear cutting surface 5, the spiral cutting edge extends to the alloy bit 31 to form the secondary cutting edge, and the spiral secondary cutting surface 8 extends to the alloy bit 31 to;

a central step 10 with millimeter strength and a convex central step 12 are vertically arranged near the axial center O on the inner side of the cutting surface 13 of the alloy cutter head 31 of the twist drill 1 with the alloy cutter head, the central step 10 with millimeter strength is vertically connected with the cutting surface 13 of the alloy cutter head 31, an included angle of more than or equal to 90 degrees is formed between the central step 10 with millimeter strength on the alloy cutter head 31 and the intersected central step 12, an included angle of more than or equal to 90 degrees is formed between the central step 10 with millimeter strength on the alloy cutter head 31 and the adjacent cutting surface 13, a central blade 11 with millimeter strength is formed by the intersection of the central step 10 with millimeter strength on the alloy cutter head 31 and the central step 12, the front ends of the central step 10 and the central step surface 12 with millimeter strength on the alloy tool bit 31 extending along the axial direction are intersected with the rear cutting surface 5 to form a side micro blade 19 and a middle cutting blade 3;

the alloy tool bit 31 is provided with a central step surface 12 which is convex towards the rotating direction at the inner side of the central step 10 with millimeter strength; the width of the central stepped surface 12 on the alloy tool bit 31 is less than or equal to one third of the radius of the twist drill 1 with the alloy tool bit.

Through above-mentioned setting up be equivalent to having beaten the fabrication hole earlier and then having drilled in drilling process, because the setting on same cutter consequently has very high stability, compares ordinary reamer and has more stable advantage, consequently possesses efficient advantage, and the drilling precision is also higher.

In the contrast experiment of going on the drilling machine, use diameter 10.15's fluted drill to be the experiment, contain high-speed steel for M35 with, thermal treatment simultaneously, with batch production, the drilling object is the gear finish turning processing price of forging quenching and tempering, drilling depth 35mm, the blind hole, alloy tool bit fluted drill 1's cutting face 13 is wide 3.5mm, central ladder 10 is high 0.6mm, under the condition that the fluted drill rotational speed and the amount of feed of common structure reach the limit, alloy tool bit fluted drill 1 can also improve rotational speed 25%, improve the amount of feed 25%, comprehensive drilling efficiency improves 0.56 times, 1 drilling 731 of alloy tool bit fluted drill of common structure, 1 drilling 3698 of alloy tool bit fluted drill, the drilling quantity increases four times more than the fluted drill of common structure than the fluted drill of dividing aversion fluted drill.

Embodiment 3:

as shown in fig. 3, an alloy-tipped twist drill 1 according to a third embodiment of the present invention, which is used in combination with the first to second embodiments, mainly relates to a drilling tool for machining, and is composed of a tool shank (not shown) including a taper shank or a straight shank and a helical cutter body 4, at least two helical cutter bodies 4 having a front end helical cutting surface on which grooves are milled are integrally or coupled and integrally provided with an alloy tip 31, the alloy tip 31 integrally forms a cutting surface 13 facing the front end in the rotational direction along the axial center of the alloy-tipped twist drill 1, and the helical cutting surfaces 13 on both sides of the integrally provided helical cutter bodies 4 are respectively provided with the same groove as the two cutting surfaces 13 integrally provided with the alloy tip 31;

on a spiral line extending in parallel along a spiral cutting edge from the vicinity of the axial center to the vicinity of the center of the radius of the minor cutting surface 8 and at or near the center of the radius on the cutting surface 13 of the alloy-tipped twist drill 1, the cutting surface 13 of the alloy cutter head 31 is vertically connected with the hole dividing table 23 with millimeter strength, an included angle which is larger than or equal to 90 degrees is formed between the hole dividing table 23 with millimeter strength on the alloy cutter head 31 and the adjacent cutting surface 24, the hole dividing table 23 with millimeter strength on the alloy cutter head 31 is intersected with the adjacent cutting surface 13 with the inner side bulge to form an included angle which is larger than or equal to 90 degrees, the cut surface 24 is intersected with the hole dividing table 23 with millimeter strength to form a cut edge 26, and the cut surface 24 and the hole dividing table 23 with millimeter strength are intersected with the rear cutting surface 5 to form a cutting edge 6 and a side micro-edge 19;

the cutting surface 13 which is provided with the millimeter-strength hole dividing table 23 and protrudes from the inner side of the upper part of the alloy cutter head 31 is a dividing surface 24, and the width of the dividing surface 24 is more than or equal to one third of the radius of the twist drill 1 with the alloy cutter head and less than or equal to two thirds of the radius of the twist drill 1 with the alloy cutter head.

In the contrast experiment that goes on the drilling machine, use the fluted drill of diameter 10.5 to be the experiment, be the cobalt-containing high-speed steel of M35 together, thermal treatment simultaneously, with batch production, the drilling object is the gear finish turning processing price of forging quenching and tempering, drilling depth 35mm, the blind hole, alloy tool bit fluted drill 1 cuts 24 wide 2.5mm in face, divide the hole platform 23 height 0.8mm, under the condition that the fluted drill rotational speed of common structure and feed reach the limit, alloy tool bit fluted drill 1 can also improve rotational speed 20%, improve the feed rate 20%, comprehensive drilling efficiency improves 0.44 times, 412 fluted drill holes of common structure, 2676 drill holes of alloy tool bit fluted drill 1, the drilling quantity increases five times more than the fluted drill of common structure more than alloy tool bit fluted drill 1.

As shown in fig. 4-5, the embodiments of the present invention are combined and selectively applied on the basis of the first to third embodiments, at least one notch edge 29 is provided on the cutting edge 6 of the alloy bit 31 of the alloy bit twist drill 1, and the notch edge 29 extends towards the rear cutting surface to form a groove 30;

or a plurality of notch edges 29 may be provided on the alloy bit cutting edge 6 of the alloy bit twist drill, each notch edge 29 extending toward the rear cutting face to form a groove 30.

Or at least one step 27 and at least one convex rear cutting surface 5 are arranged on the rear cutting surface 5 where the alloy bit of the alloy bit twist drill is positioned in a manner that the height of the rear cutting surface 5 in the direction of the outer side edge 7 from the axial center is reduced, the at least one step 27 and the cutting surface 13 at the front end in the rotating direction are intersected to form at least one step edge 28, and the at least one convex rear cutting surface 5 and the cutting surface 13 at the front end in the rotating direction are intersected to form at least one convex cutting edge 6.

Or a plurality of steps 27 and a plurality of convex rear cutting surfaces 5 are arranged on the rear cutting surface 5 where the alloy bit of the alloy bit twist drill is positioned, in a manner that the height of the rear cutting surface 5 in the direction of the outer side edge 7 from the axial center is reduced, the steps 27 and the cutting surface 13 at the front end in the rotating direction are intersected to form a plurality of steps 28, and the convex rear cutting surfaces 5 and the cutting surface 13 at the front end in the rotating direction are intersected to form a plurality of convex cutting edges 6;

or at least one or more steps 27 and at least one or more raised rear cutting faces 5 are arranged on the rear cutting face 5 where the alloy bit of the twist drill with the alloy bit is arranged in a manner that the height of the rear cutting face 5 in the direction of the side edge 7 outside from the axial center is reduced, the at least one or more steps 27 and the cutting face 13 at the front end in the rotating direction are intersected to form at least one or more steps 28, and the at least one or more raised rear cutting faces 5 and the cutting face 13 are intersected to form at least one or more raised cutting edges 6; and at least one or more stepped cutting edges 6 are provided with at least one or more notch edges 29, each notch edge extending towards the rear cutting face to form a groove 30.

The cutting efficiency and the service life of the alloy bit twist drill 1 can be maximized by the combined arrangement of the cutting edge 6 of the alloy bit 31 of the alloy bit twist drill 1 provided with the notch edge 29 for breaking chips and decomposing cutting force and extending the notch edge to the rear cutting surface to form the groove 30.

The stepped convex step 27 is arranged on the rear cutting surface 5 of the alloy tool bit 31 of the alloy tool bit twist drill 1, so that the stability of the alloy tool bit twist drill 1 in drilling is effectively improved, the cutting resistance is effectively decomposed, and the cutting efficiency and the service life of the alloy tool bit twist drill 1 are improved.

On the basis of the first to third embodiments, the included angle formed by the cutting edge 6 of the outermost alloy cutter head 31 of the twist drill 1 with the spiral auxiliary cutting edge 14 is an acute angle; or the included angle of the cutting edge 6 of the alloy cutter head 31 at the outermost side of the twist drill with the alloy cutter head and the intersection angle of the spiral auxiliary cutting edge 14 are right angles; or the included angle of the cutting edge 6 of the alloy cutter head 31 at the outermost side of the twist drill with the alloy cutter head and the spiral auxiliary cutting edge 14 is an obtuse angle.

The rear cutting surfaces 5 on the two sides of the front end of the alloy bit 31 of the twist drill 1 with the alloy bit are intersected at the axial center to form a chamfer surface 22, a chamfer edge 24 and a chisel edge 3; or the back cutting surfaces on the two sides of the front end of the alloy bit of the twist drill with the alloy bit are intersected at the axial center to form a chamfer surface 22, a chamfer surface 22 without a chisel edge, a chamfer edge 24 and a sharp edge O.

The tool shank and the spiral tool body of the twist drill 1 with the alloy tool bit are integrally provided with cooling holes 32.

The tool handle (not shown) of the twist drill 1 with the alloy tool bit is a straight handle; or the cutter handle (not shown) of the twist drill 1 with the alloy bit is a taper handle.

Although the above description has been made by taking a tool having two helical blades 4 as an example, the tool of the present invention may have a plurality of helical blades 4, and the configuration of the above-described embodiment and various other combinations of the helical blades 4 may be adopted.

The preferred embodiments described above are illustrative rather than limiting and the invention may be embodied and carried out in other ways without departing from the spirit and essential characteristics thereof, the scope of the invention being indicated by the claims and all changes that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims

1. A twist drill with alloy bit is composed of a handle, spiral cutters and alloy bit, and features that at least two spiral cutters are integrally arranged on the twist drill with alloy bit, the spiral cutting surface is formed on the surface of each spiral cutter facing to cutting direction, the spiral cutting surface is the spiral auxiliary cutting surface on the external surface of spiral cutting surface, the spiral cutting surface is crossed with the spiral auxiliary cutting surface to form spiral cutting edge, the back surface of spiral cutting surface is the back cutting surface, the transverse or sharp edges are formed on the back cutting surfaces, the cutting edges are formed on the back cutting surface, and the side edges are formed on the back cutting surface,

2. A twist drill with alloy bit is composed of a handle, spiral cutters and alloy bit, and features that at least two spiral cutters are integrally arranged on the twist drill with alloy bit, the spiral cutting surface is formed on the surface of each spiral cutter facing to cutting direction, the spiral cutting surface is the spiral auxiliary cutting surface on the external surface of spiral cutting surface, the spiral cutting surface is crossed with the spiral auxiliary cutting surface to form spiral cutting edge, the back surface of spiral cutting surface is the back cutting surface, the transverse edges are formed on the back cutting surfaces, the cutting edges are formed on the back cutting surfaces, and the side edges are formed on the back cutting surface,

3. A twist drill with alloy bit is composed of a handle, spiral cutters and alloy bit, and features that at least two spiral cutters are integrally arranged on the twist drill with alloy bit, the spiral cutting surface is formed on the surface of each spiral cutter facing to cutting direction, the spiral cutting surface is the spiral auxiliary cutting surface on the external surface of spiral cutting surface, the spiral cutting surface is crossed with the spiral auxiliary cutting surface to form spiral cutting edge, the back surface of spiral cutting surface is the back cutting surface, the transverse edges are formed on the back cutting surfaces, the cutting edges are formed on the back cutting surfaces, and the side edges are formed on the back cutting surface,

4. The alloy-tipped twist drill according to any one of claims 1 to 3,

the method is characterized in that: at least one or more notch edges are arranged on the alloy bit cutting edge of the twist drill with the alloy bit; each of the recessed edges extends toward the rear cutting face to form a recess.

5. The alloy-tipped twist drill according to any one of claims 1 to 3,

the method is characterized in that: and at least one or more stages of raised steps and at least one or more stages of raised rear cutting surfaces are arranged on the rear cutting surface where the alloy bit of the twist drill with the alloy bit is positioned in a manner that the height of the rear cutting surface in the direction of the outer side edge is reduced from the axial center, the raised steps and the cutting surface at the front end in the rotating direction are intersected to form at least one or more stages of raised step edges, and the at least one or more stages of raised rear cutting surfaces and the cutting surface at the front end in the rotating direction are intersected to form at least one or more stages of raised cutting edges.

6. The alloy-tipped twist drill according to any one of claims 1 to 3,

the method is characterized in that: at least one or more stages of standing steps and at least one or more stages of raised rear cutting surfaces are arranged on the rear cutting surface where the alloy bit of the twist drill with the alloy bit is positioned in a mode that the height of the rear cutting surface in the direction of the lateral edge on the outer side is reduced from the axial center, the at least one or more stages of standing steps and the cutting surface at the front end in the rotating direction are intersected to form at least one or more stages of standing step edges, and the at least one or more stages of raised rear cutting surfaces and the cutting surface are intersected to form at least one or more stages of raised cutting edges; and at least one or more notch edges are arranged on the stepped cutting edge of the alloy cutter head with at least one or more steps, and each notch edge extends towards the rear cutting surface to form a groove.

7. The alloy-tipped twist drill according to any one of claims 1 to 3,

the method is characterized in that: the rear cutting surfaces on two sides of the front end of the alloy tool bit of the twist drill with the alloy tool bit are intersected at the axial center to form a chamfer surface, a chamfer edge and a chisel edge; or the rear cutting surfaces on the two sides of the front end of the alloy tool bit of the twist drill with the alloy tool bit are intersected at the axial center to form a chamfer surface, a chamfer edge and a sharp edge without a chisel edge.

8. The alloy-tipped twist drill according to any one of claims 1 to 3,

the method is characterized in that: and cooling holes are integrally formed in the cutter handle and the spiral cutter body of the twist drill with the alloy cutter head.

9. The alloy-tipped twist drill according to any one of claims 1 to 3,

the method is characterized in that: the included angle formed by the cutting edge on the outermost side of the alloy tool bit of the twist drill with the alloy tool bit and the spiral auxiliary cutting edge is an acute angle; or the included angle formed by the cutting edge at the outermost side of the alloy tool bit of the twist drill with the alloy tool bit and the spiral auxiliary cutting edge is a right angle; or the included angle formed by the cutting edge at the outermost side of the alloy tool bit of the twist drill with the alloy tool bit and the spiral auxiliary cutting edge is an obtuse angle.

10. The alloy-tipped twist drill according to any one of claims 1 to 3,

the method is characterized in that: the cutter handle of the twist drill with the alloy cutter head is a straight handle; or the cutter handle of the twist drill with the alloy cutter head is a taper handle.