CN112139569A

CN112139569A - Twist drill with combined edge and alloy tool bit

Info

Publication number: CN112139569A
Application number: CN202010428077.4A
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: 2020-12-29

Abstract

The invention provides a twist drill with combined edge alloy cutter bits, 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, and comprises a cutter handle and a spiral cutter body 1.

Description

Twist drill with combined edge and alloy tool bit

The technical field is as follows:

the invention relates to a twist drill with a combined edge and an alloy cutter head, which is used for the drilling and milling process of mechanical processing and the maintenance of a bench worker.

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 has 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 a micro gap is higher, and the essential structural characteristics of substances are not disclosed, so that the existing drilling, poor stability and poor drilling precision.

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 combined-edge alloy tips, 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 new theory in recent years is, the higher strength is, the lower strength is, the intrinsic structural characteristics of a solid is not disclosed, in the case that two solids have the same volume, the surface area of a dispersed small-volume solid is greater than that of an integral solid, even if diamond is broken when the integral structure of a solid reaches a certain volume limit, the sum of the stress strength of the small-volume solid is greater than that of the integral solid according to the volume, and experiments prove that in a cutting tool in a conventional physical state, 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 with the combined edge.

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

a twist drill with combined blade and alloy bit is composed of a handle, a helical cutter body with at least two helical blades, and an alloy bit, and at least two helical cutting blades consisting of a back cutting blade and a transverse blade,

the method is characterized in that: the twist drill with the combined edge and the alloy cutter head integrally comprises a cutter handle and the 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 one alloy cutter head, the alloy cutter head is integrally provided with two cutting surfaces facing to the front end of the rotation direction along the axial center of the twist drill, the spiral cutting surfaces at two sides of the integrally provided two spiral cutter bodies are respectively and integrally provided with the two cutting surfaces of the alloy cutter head with 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 twist drill with the alloy bit with the combined edge is provided with a micro-section with millimeter strength, which is recessed from the cutting surface of the alloy bit in the axial center direction along the cutting edge on the outer periphery of the alloy bit; a micro-strengthening stress extension table with millimeter strength is formed on the inner side of the micro-section of the alloy bit of the twist drill with the combined edge alloy 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.

And the inner side of the cutting surface of the twist drill with the combined edge alloy tool bit is close to the axial center, and a central step platform with millimeter strength is vertically arranged on the cutting surface; 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 central step platform with millimeter strength of the twist drill with the combined edge alloy tool bit is intersected with the rear cutting surface to form a side micro edge with millimeter strength; the central step with millimeter strength and the central step surface with millimeter strength are intersected to form a central blade with millimeter strength; the width of the central stepped surface is less than or equal to one third of the radius of the twist drill with the alloy cutter head with the combined edge.

And the alloy bit of the twist drill with the combined edge is provided with a hole dividing table with millimeter strength in a stepped concave manner from the axial center to the cutting surface of the auxiliary cutting edge on the outer periphery; the cutting surface protruding from the inner side of the hole dividing table with millimeter strength is a dividing cutting surface, and the dividing cutting 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 is intersected with the cutting surface protruding from the inner side to form a dividing cutting edge with millimeter strength; the width of the slitting plane is more than or equal to one third of the radius of the twist drill with the combined edge alloy cutter head, and less than or equal to two thirds of the radius of the twist drill with the combined edge alloy cutter head.

And the alloy bit of the twist drill with the combined edge is provided with a hole dividing table with millimeter strength in a stepped concave manner from the axial center to the cutting surface of the auxiliary cutting edge on the outer periphery; 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 is intersected with the cutting surface protruding from the inner side to form a dividing cutting edge with millimeter strength; the width of the slitting plane is more than or equal to one third of the radius of the twist drill with the alloy cutter head with the combined edge and less than or equal to two thirds of the radius of the twist drill with the alloy cutter head with the combined edge;

and the alloy tool bit cutting edge of the twist drill with the combined edge alloy tool bit is provided with at least one notch edge;

the notch edge extends towards the rear cutting surface to form at least one groove.

the twist drill with the alloy bit with the combined edge is provided with a micro-section with millimeter strength, which is recessed from the cutting surface of the alloy bit in the axial center direction along the cutting edge on the outer periphery of the alloy bit; 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 combined-edge alloy tool bit twist drill in a protruding mode; 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-cutting surface with millimeter strength is intersected with the rear cutting surface 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;

and the rear cutting surface of the combined-blade alloy bit twist drill is provided with at least one level of raised steps and at least one level of raised rear cutting surface in a mode 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 are intersected with the cutting surface at the front end in the rotating direction to form at least one level of raised step blades, and the raised rear cutting surfaces are intersected with the cutting surface at the front end in the rotating direction to form at least one level of raised cutting edges.

Preferably, a chamfer surface and a chisel edge 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 combined-edge 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 cutter head of the twist drill with the combined-edge alloy cutter head are intersected at the axial center to form a chamfer surface and a sharp edge without a chisel edge.

Preferably, the tool handle of the twist drill with the alloy cutter head with the combined edges is a straight handle.

Or the cutter handle of the twist drill with the alloy cutter head with the combined edge is a taper handle.

Preferably, the tool shank and the spiral strip of the twist drill with the combined-edge alloy bit are integrally provided with cooling holes.

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

Preferably, the alloy bit cutting edge of the twist drill with the combined edge alloy bit can be provided with a plurality of notch edges, and each notch edge extends towards the rear cutting surface to form a groove.

Preferably, the twist drill with the combined-blade alloy bit has a rear cutting surface on which the alloy bit is located, the rear cutting surface having a plurality of steps and a plurality of convex rear cutting surfaces rising from an axial center thereof, the rear cutting surface having a side edge facing outward being formed with a height decreasing in the rear cutting surface, the plurality of steps and the cutting surface at the front end in the rotational direction intersecting each other to form a plurality of steps and a plurality of convex cutting edges intersecting each other to form a plurality of convex 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 where the alloy bit of the twist drill with the combined edge alloy bit is located, 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 rotating direction intersect to form at least one or more steps and edges, 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.

Has the advantages that:

in the contrast experiment that goes on the drilling machine, use the fluted drill of diameter 10.15 to be the experiment, be M35's cobalt-containing high-speed steel 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 condition of limit, combination sword alloy 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 combination sword alloy bit fluted drill increases more than the fluted drill of ordinary structure threefold.

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 micro-enhanced stress extension table and micro-facet portion provided on the cutting face of a twist drill with a composite-edge alloy tip according to a first embodiment of the present invention.

Fig. 2 is a schematic view of the center step land and the center step face portion provided on the twist-drill cutting face of the composite-edge alloy-bit of the first embodiment of the present invention.

Fig. 3 is a schematic view of the hole-dividing land and the section of the cutting face of a twist drill with a composite-edge alloy tip according to a first embodiment of the present invention.

Fig. 4 is a combined application diagram of a micro-stress-enhancement extension platform and a micro-section, a central step platform and a central step surface, and a hole-dividing platform and a section-dividing surface arranged on the twist-drill cutting surface of the alloy tool bit with combined edges of the first embodiment to the third embodiment of the invention.

Fig. 5 is a schematic view of the combined application of the second embodiment in which the notch edge provided on the cutting edge of the twist drill with the combined-edge alloy bit of the first embodiment of the present invention extends toward the rear cutting surface to form a groove or the combined application of the third embodiment in which a step provided standing on the rear cutting surface forms a step edge on the cutting surface.

The specific implementation mode is as follows:

preferred embodiments of the twist drill with combined-edge alloy tips according to the present invention will be described in detail below with reference to the accompanying drawings, and in embodiments 1 to 3, a tool having two helical strips will be mainly described as an example.

Embodiment 1:

as shown in fig. 1 to 4, a twist drill with a combined-edge alloy bit and a combined-edge alloy bit according to a first embodiment of the present invention mainly relates to a drilling tool for machining, the twist drill with a combined-edge alloy bit integrally comprises a tool shank (not shown) including a taper shank or a straight shank and a spiral cutter body 4, at least two spiral cutter bodies 4 are milled on the front spiral cutting surface and integrally or coupled and integrally provided with an alloy bit 31, the alloy bit 31 is integrally formed with a cutting surface 13 facing the front end in the rotation direction along the axial center of the twist drill 1 with the combined-edge alloy bit, and the spiral cutting surfaces 13 on both sides of the integrally provided two spiral cutter bodies 4 are respectively provided with the same groove as the two cutting surfaces 13 integrally provided with the alloy cutter body 31;

the twist drill 1 with the combined blade alloy bit is integrally provided with two spiral cutter bodies 4, the surface of the alloy bit 31 of each spiral cutter body 4 facing to the cutting direction is provided with a cutting surface 13, the surface of the outer surface side of the cutting surface 13 facing backwards in the rotating direction is provided with a secondary cutting surface 8, the cutting surface 13 and the secondary cutting surface 8 are intersected to form a spiral cutting edge, the surface of the axial front end back side of the cutting surface 13 is provided with a rear cutting surface 5, the rear cutting surfaces at least at two sides are intersected to form a chisel edge, the two end chamfers of the chisel edge are provided with a chamfer surface 22 and a chamfer edge 2, the cutting surface 13 and the rear cutting surface 5 are intersected to form a cutting edge 6, the secondary cutting surface 8 and the rear cutting surface 5 are intersected to form a side edge 7, the spiral cutting edge extends to the alloy bit 31 to form the secondary cutting edge, the spiral secondary cutting surface 8 extends to the alloy bit 31 to form the secondary cutting surface 8 of, or the auxiliary cutting surface 8 and the alloy cutter head 31 are protruded out of the spiral auxiliary cutting surface 8;

a 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 along the outer periphery of the alloy cutter head 31 on the twist drill 1 with the combined edge alloy cutter head; the inner side of the micro-section 18 of the alloy bit 31 of the twist drill 1 with the combined edge is convexly provided with a micro-reinforced stress extension table 20 with millimeter strength; 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 micro-cutting surface 18 with millimeter strength and the rear cutting surface 5 intersect to form a cutting micro-blade 16 with millimeter strength; the micro-stress extension stands 20 with millimeter strength intersect the rear cutting face 5 to form side micro-blades 19 with millimeter strength.

And near the inner side of the spiral cutting surface 13 of the twist drill 1 with the combined edge alloy cutter head close to the axial center O, a central step 10 with millimeter strength and a convex central step surface 12 are vertically arranged, the central step 10 with millimeter strength is vertically connected with the cutting surface 13, an included angle which is more than or equal to 90 degrees is formed between the central step 10 with millimeter strength and the intersected central step surface 12, an included angle which is more than or equal to 90 degrees is formed between the central step 10 with millimeter strength and the adjacent cutting surface 13, a central edge 11 with millimeter strength is formed by the intersection of the central step 10 with millimeter strength and the central step surface 12, the cutting surface 13, the central step 10 with millimeter strength and the central step surface 12 intersect with the rear cutting surface 5 at the front end extending along the axial direction to form a side micro blade 19 and a middle cutting blade 3; the inner side of the central step platform 10 with millimeter strength is provided with a central step surface 12 which is convex towards the rotating direction; the width of the central stepped surface 12 is less than or equal to one third of the radius of the twist drill 1 with the alloy cutter head with the combined edge;

and on a spiral line extending in parallel along the spiral cutting edge from the vicinity of the axial center to the vicinity of the center of the radius of the sub cutting face 8 and at the center or the vicinity of the radius on the cutting face 13 of the twist drill 1 with the combined-edge alloy tip, a hole dividing table 23 and a splitting surface 24 which are arranged in a stepped protruding mode and have millimeter strength are formed, the hole dividing table 23 with millimeter strength is connected to the cutting surface 13 in a standing mode, an included angle which is larger than or equal to 90 degrees is formed between the hole dividing table 23 with millimeter strength and the adjacent splitting surface 24, the hole dividing table 23 with millimeter strength and the cutting surface 13 adjacent to the inner side protruding mode are intersected to form an included angle which is larger than or equal to 90 degrees, the splitting surface 24 and the hole dividing table 23 with millimeter strength are intersected to form a splitting blade 26, and the cutting surface 24 and the hole dividing table 23 with millimeter strength and the rear cutting surface 5 are intersected to form a cutting blade 6 and a side micro blade 19; the cutting surface 13 protruding from the inner side of the upper part of the hole dividing table 23 with millimeter strength 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 combined edge alloy bit twist drill 1 and less than or equal to two thirds of the radius of the combined edge alloy bit twist drill 1.

The arrangement is equivalent to drilling a process hole and then drilling, because the micro-reinforced stress extension table 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 characteristic is that the average strength of one side surface of the micro-section with millimeter strength in terms of volume is greater than the centimeter level, the centimeter level is greater than the decimeter level, 1 cubic centimeter is 1 kilocubic millimeter, the area is the surface area of 1 cubic centimeter which is 6 hundred square millimeters, the surface area of 1 thousand cubic millimeters is 6 thousand square millimeters, the force applied in terms of volume is one tenth of the surface area of 1 thousand cubic millimeters, so the pressure bearing limit of the millimeter level is far greater than the centimeter level, in addition, the force of the spiral micro-reinforced stress extension table 20 with millimeter strength has the effect of supporting and reinforcing the strength of the micro-section 18 with millimeter strength, so that the arrangement on the same tool has high strength and stability, and compared with a common reamer, the micro-reinforced stress extension table has the advantages of higher durability and strength edge stability, thereby having the advantage of high efficiency and higher drilling precision.

The chisel edge O is formed by intersecting the rear cutting surfaces at two sides of the twist drill with the alloy bit with the combined edge, or the chamfer surfaces 22 are formed by chamfering at two ends of the chisel edge O, the original chisel edge O of the chamfer edge 2 is formed into a reduced chisel edge O or a sharp edge O without the chisel edge O after being chamfered, and the huge resistance generated by overlong the chisel edge is greatly reduced due to the reduction or elimination of the chisel edge.

According to the above structure, since the drilling cutting is a circular motion, a centrifugal force is generated during the circular motion, the cutting edge 6 forms a transmission carrier of the centrifugal force, the cutting face 13 and the adjacent spiral micro-reinforcing stress spreading stage 16 and the micro-cutting edge 17 formed by intersecting the micro-cutting face 18 with millimeter strength and the rear cutting face, the cutting edges 6 are separated by the side micro blades 19, the side micro blades 19 and the micro-reinforced stress extension table 20 form a composite positioning function, cutting force is differentiated, integral cutting force is reduced, the stress action of the micro cutting edges 17 and the inner side cutting edges 6 of the outer side cutting faces, namely the micro tangent face 18 and the rear cutting face, is reduced to the maximum extent, the temperature of the alloy cutter head 31 is reduced, the stress of the cutting edge at the outer end of the cutter which is most vulnerable is decomposed, the service life of the cutter is prolonged, and high strength is kept in the machining process all the time.

In the comparative experiment carried out on the drilling machine, the twist drill with the diameter of 10.5 is used as an experiment, the twist drill with the diameter of M35 is used as cobalt-containing high-speed steel, the heat treatment is carried out simultaneously, the production is carried out in the same batch, the drilling object is the gear finish turning processing price of forging quenching and tempering, the drilling depth is 35mm, the blind hole is formed, the micro section 18 width of the twist drill with the combined edge alloy cutter head is 1.5mm, the micro strengthening stress extension table is 20 mm high by 0.6mm, under the condition that the rotating speed and the feed amount of the twist drill with the common structure reach the limit, the rotating speed of the twist drill with the combined edge alloy cutter head can be increased by 25 percent, the feed amount is increased by 25 percent, the comprehensive drilling efficiency is increased by 0.56 times, the alloy twist drill with the common structure drills 526, the twist drill with the combined edge alloy cutter head drills 4316, and the.

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. 1 to 5, in the twist drill 1 with the combined-edge alloy bit according to the second embodiment of the present invention, a notch edge 29 is provided on the cutting edge 6 of the alloy bit 31 added to the first embodiment, and the notch edge 29 extends to the rear cutting surface to form a groove 30.

By adding a combination of the notch edge 29 and the groove 30 extending toward the rear cutting surface to the cutting edge 6 of the alloy tip 31 of the twist drill 1 with the combined-edge alloy tip described in the first embodiment 1, the cutting efficiency and the service life of the twist drill 1 with the combined-edge alloy tip can be maximized by utilizing the effect of chip breaking and cutting force decomposition of the notch edge 29.

In the contrast experiment carried out on the drilling machine, the twist drill with the diameter of 10.5 is used as an experiment, the same is M35 cobalt-containing high-speed steel, the heat treatment is carried out simultaneously, the production is carried out in the same batch, the drilling object is the gear finish turning processing price of forging quenching and tempering, the drilling depth is 35mm, the blind hole, the micro section 18 width of the twist drill with the combined edge alloy cutter head 1 is 1.5mm, the micro strengthening stress extension table 20 is 0.6mm high, under the condition that the rotating speed and the feed amount of the twist drill with the common structure reach the limit, the rotating speed of the twist drill with the combined edge alloy cutter head 1 can be increased by 25 percent, the feed amount is increased by 25 percent, the comprehensive drilling efficiency is increased by 0.56 times, 526 alloy twist drill holes with the common structure are formed in the twist drill with the combined edge alloy cutter head 1, 13316 drill holes are formed in the combined edge alloy cutter head twist drill with the drilling.

Embodiment 3:

as shown in fig. 1 to 5, in a twist drill 1 with a combined-blade alloy tip according to a second embodiment of the present invention, in addition to the first to second embodiments, at least one step 27 and at least one raised rear cutting surface 5 are provided on the rear cutting surface 5 where the alloy tip of the twist drill with a combined-blade alloy tip according to the present invention is located, such that the height of the rear cutting surface 5 in the direction of the outer side cutting edge 7 decreases from the axial center, and the at least one step 27 intersects with the cutting surface 13 at the front end in the rotational direction to form at least one step edge 28, and the at least one raised rear cutting surface 5 intersects with the cutting surface 13 at the front end in the rotational direction to form at least one raised cutting edge 6.

The wear-resistant micro-strengthening stress extending platform 20 and the micro-tangent plane 18 are arranged on the cutting surface 13 of the alloy bit 31 of the twist drill 1 with the combined edge alloy bit; a central edge 11 and a central stepped surface 12 of the central stepped platform 10 for degrading cutting force; and a hole dividing platform 23 for enhancing stability, a step-shaped step 27 on the rear cutting surface 5 for positioning and decomposing cutting force is arranged on the dividing blade 26, the dividing surface 24 and the cutting blade, and the combination of the step-shaped cutting blade 6 and the step-shaped cutting blade 28 formed by protruding on the cutting blade 6 can exert the stability, the cutting efficiency and the service life of the combined blade alloy cutter head twist drill 1 to the maximum extent.

In a comparison experiment carried out on a drilling machine, a twist drill with the diameter of 10.5 is taken as an experiment, the twist drill is M35 cobalt-containing high-speed steel, the heat treatment is carried out simultaneously, the production is carried out in the same batch, the drilling object is the forging hardened and tempered gear finish turning processing price, the drilling depth is 35mm, a blind hole is formed, the width of a split surface 24 of the twist drill with the combined edge alloy cutter head is 2.5mm, the height of a hole splitting table 23 is 0.8mm, under the condition that the rotating speed and the feed amount of the twist drill with the common structure reach the limit, the rotating speed of the twist drill with the combined edge alloy cutter head can be increased by 20%, the feed amount can be increased by 20%, the comprehensive drilling efficiency is increased by 0.44 times, and the twist drill with the combined edge alloy cutter head with the common structure drills 4676.

As shown in fig. 5, in the twist drill 1 with a combined-edge alloy tip according to the fifth embodiment of the present invention, in addition to the first embodiment, a plurality of notch edges 29 may be provided on the alloy tip cutting edge 6 of the twist drill with a combined-edge alloy tip, and each notch edge 29 may have one groove 30 extending toward the rear cutting surface.

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 combined-blade 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 intersect 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 intersect 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 surfaces 5 are arranged on the rear cutting surface 5 where the alloy bit of the combined-edge twist drill is arranged in a manner that the height of the rear cutting surface 5 in the direction of the outer side edge 7 is reduced from the axial center, the at least one or more steps 27 and the cutting surface 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 surfaces 5 and the cutting surface 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 twist drill 1 with the alloy bit with the combined edge can be maximized by the combined arrangement that the notch edge 29 which breaks chips and decomposes the cutting force is arranged on the cutting edge 6 of the alloy bit 31 of the twist drill 1 with the combined edge and extends 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 twist drill 1 with the combined edge alloy tool bit, so that the stability of the twist drill 1 with the combined edge alloy tool bit in drilling is effectively improved, the cutting resistance is effectively decomposed, and the cutting efficiency and the service life of the twist drill 1 with the combined edge alloy tool bit are improved.

On the basis of the first to third embodiments, the included angle formed by the cutting edge 6 of the outermost alloy tool bit 31 of the combined-edge alloy tool bit twist drill 1 and the spiral minor cutting edge 14 is an acute angle; or the included angle formed by the cutting edge 6 of the alloy cutter head 31 at the outermost side of the twist drill with the combined edge alloy cutter head and the spiral auxiliary cutting edge 14 is a right angle; or the included angle between the cutting edge 6 of the outermost alloy tool bit 31 of the twist drill with the combined edge alloy tool bit 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 combined edge 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 rear cutting surfaces on the two sides of the front end of the alloy bit of the twist drill with the combined edge 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 combined-edge alloy tool bit are integrally provided with cooling holes 32.

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

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

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 main idea and the essential characteristics thereof, the scope of the invention being defined by the claims, all variations which come within the scope of the claims being embraced thereby.

Claims

1. A twist drill with combined blade and alloy bit is composed of a handle, a helical cutter body with at least two helical blades, and an alloy bit, and a helical cutting surface consisting of the front and back end surfaces of each helical blade and with transverse blades,

the method is characterized in that: the twist drill with the combined edge and the alloy cutter head integrally comprises a cutter handle and the 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 the alloy cutter head, the alloy cutter head is integrally provided with two cutting surfaces facing to the front end in the rotating direction along the axial center of the twist drill, the spiral cutting surfaces at the two sides of the integrally provided two spiral cutter bodies are respectively and integrally provided with the two cutting surfaces of the alloy cutter head with 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 twist drill with the alloy bit with the combined edge is provided with a micro-section with millimeter strength, which is recessed from the cutting surface of the alloy bit in the axial center direction along the cutting edge on the outer periphery of the alloy bit; 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 combined edge alloy tool bit in a protruding mode; 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.

And the alloy bit of the twist drill with the combined edge is provided with a hole dividing table with millimeter strength in a stepped concave manner from the axial center to the cutting surface of the auxiliary cutting edge on the outer periphery; 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 is intersected with the cutting surface protruding from the inner side to form a dividing cutting edge with millimeter strength; the width of the slitting plane is more than or equal to one third of the radius of the twist drill with the alloy cutter head with the combined edge and less than or equal to two thirds of the radius of the twist drill with the alloy cutter head with the combined edge.

2. A twist drill with combined blade and alloy bit is composed of a handle, a helical cutter body with at least two helical blades, and an alloy bit, and a helical cutting surface consisting of the front and back end surfaces of each helical blade and with transverse blades,

3. A twist drill with combined blade and alloy bit is composed of a handle, a helical cutter body with at least two helical blades, and an alloy bit, and a helical cutting surface consisting of the front and back end surfaces of each helical blade and with transverse blades,

and the rear cutting surface of the combined edge alloy bit twist drill is provided with at least one stage of standing step and at least one stage of raised rear cutting surface in a mode that the height of the rear cutting surface in the direction of the lateral edge outside from the axial center is reduced, the standing step is intersected with the cutting surface at the front end in the rotating direction to form at least one stage of standing step edge, and the at least one stage of raised rear cutting surface is intersected with the cutting surface at the front end in the rotating direction to form at least one stage of raised cutting edge.

4. A twist drill with a combined edge alloy bit 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 cutter head of the twist drill with the combined-edge alloy cutter head are intersected at the axial center to form a chamfer surface and a chisel edge; or the rear cutting surfaces on the two sides of the front end of the alloy cutter head of the twist drill with the combined-edge alloy cutter head are intersected at the axial center to form a chamfer surface and a sharp edge without a chisel edge.

5. A twist drill with a combined edge alloy bit according to any one of claims 1 to 3,

the method is characterized in that: the tool handle of the twist drill with the combined edge alloy tool bit is a straight handle.

6. A twist drill with a combined edge alloy bit according to any one of claims 1 to 3,

the method is characterized in that: the tool handle and the spiral strip of the twist drill with the combined-edge alloy tool bit are integrally provided with cooling holes.

7. A twist drill with a combined edge alloy bit according to any one of claims 1 to 3,

the method is characterized in that: the included angle formed by the cutting edge at the outermost side of the twist drill with the combined edge alloy cutter head and the spiral auxiliary cutting edge is an acute angle; or the intersection included angle of the cutting edge at the outermost side of the twist drill with the combined edge alloy cutter head 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 twist drill with the combined edge alloy cutter head and the spiral auxiliary cutting edge is an obtuse angle.

8. A twist drill with a combined edge alloy bit according to any one of claims 1 to 3,

the method is characterized in that: the alloy bit cutting edge of the twist drill with the combined edge and the alloy bit can be provided with a plurality of notch edges, and each notch edge extends towards the rear cutting surface to form a groove.

9. A twist drill with a combined edge alloy bit according to any one of claims 1 to 3,

the method is characterized in that: the back cutting surface of the twist drill with the combined blade alloy bit is provided with a plurality of steps and a plurality of convex back cutting surfaces in a mode of descending height from the axial center to the back cutting surface of the side edge direction of the outer side, the steps which are erected in a plurality of stages are intersected with the cutting surface of the front end in the rotating direction to form a plurality of steps and the convex back cutting surfaces are intersected with the cutting surface of the front end in the rotating direction to form a plurality of convex cutting edges.

10. A twist drill with a combined edge alloy bit 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 combined edge alloy bit is positioned in a mode that the height of the rear cutting surface in the direction of the outer side edge 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.