CN111730111A - Twist drill with alloy tool bit - Google Patents

Abstract

The invention provides an alloy cutter head twist drill, which mainly relates to a drilling cutter used for machining. In the case of the same material of the cutter body and the alloy cutter head, the alloy cutter head twist drill is applied with millimeter strength. On the millimeter scale, the strength of the alloy cutter head twist drill is at least % higher than that of the ordinary structure twist drill. More than 50, the average pressure on the cutting surface of the millimeter-sized alloy cutter head twist drill can be increased by more than 50%.

Description

Alloy bit twist drill

Technical field:

The invention relates to an alloy cutter head twist drill. The alloy cutter head twist drill is used in the drilling and milling process of machining and in the maintenance of fitters. The new machining theory considers that the cutting efficiency of the segmented cutting edge is high. As the shape of the cutting edge is gradually lengthened, it is found that its effect decreases significantly until it disappears, so this theory is still not really correct.

Background technique:

At present, the drilling tools used in machining are composed of a chisel edge, a cutting edge, a spiral cutting edge, and a side edge. Inside, the cutting edge is simultaneously subjected to the rotating cutting force and the center-outward conduction force. Under the action of the double force, the cutting edge at the intersection of the cutting edge and the helical cutting edge is always easily damaged. It is not absolutely balanced and the phenomenon of oscillation occurs. The helical cutting surface and the helical cutting edge are damaged simply by stabilizing the tool on the helical cutting surface. It is generally understood that the smoother the surface, the higher the strength. The new theory is that the surface with a small gap is stronger. However, the existing hole machining tools have low efficiency, are easily damaged, have poor stability and poor drilling accuracy.

Invention content:

The present invention is proposed in view of the above problems, and aims to provide an alloy cutter head twist drill, which has the function of blocking conduction force, has high heat dissipation efficiency, high strength, long life, and can be used in drilling processing. It is easy to locate and has high drilling accuracy. It is generally understood that the smoother the surface, the higher the strength. In recent years, the new theory is that the surface with small gaps has higher strength, but neither reveals the essential structural characteristics of the material. When the solid volume is the same, the surface area of the dispersed small-volume solid is larger than that of the overall solid. When the overall structure of the solid reaches a certain volume limit, even diamond will be broken. The sum of the mechanical strength of the solid is much greater than that of the whole solid. It has been verified by experiments that on the cutting tool in the conventional physical state, the millimeter level has the most obvious high-strength characteristic, that is, the millimeter strength. The invention is in the alloy knife. Head twist drills for applications with millimeter strength.

To achieve the above object, the present invention adopts the following technical solutions:

Alloy cutter head twist drill, relates to a drilling tool for machining, including a tool holder, a helical cutter body and an alloy cutter head. The alloy cutter head twist drill is integrally provided with at least two helical cutter bodies, and each helical cutter body is provided with at least two helical cutter bodies. The surface facing the cutting direction is formed as a spiral cutting surface, and the surface on the outer side of the spiral cutting surface backward in the rotation direction is a spiral secondary cutting surface. The surface on the back side of the front end in the axial direction is formed as a rear cutting surface, at least the rear cutting surfaces on both sides intersect to form a chisel edge or a sharp edge, the helical cutting surface intersects with the rear cutting surface to form a cutting edge, and the helical secondary cutting surface and the rear cutting surface intersect. intersect to form a side edge,

It is characterized in that: the alloy cutter head twist drill is integrally composed of a cutter handle and a helical cutter body, and the front end helical cutting surfaces of at least two helical cutter bodies are milled grooves, which are integrally or connected and formed integrally provided with An alloy cutter head, the alloy cutter head is integrally formed with two cutting surfaces facing the front end of the rotating direction along the axial center of the alloy cutter head twist drill, and the two spiral cutter bodies are integrally provided on both sides of the helical cutting surfaces The two cutting surfaces integrally provided with the alloy cutter head are respectively arranged in the same groove, the spiral cutting edge extends to the alloy cutter head to form a secondary cutting edge, and the spiral secondary cutting surface extends to the alloy cutter head to form a secondary cutting surface;

and the alloy cutter head of the alloy cutter head twist drill along the outer peripheral edge of the alloy cutter head and the alloy cutter head cutting surface along the outer peripheral edge of the alloy cutter head toward the axial center direction, the micro-cut surface with millimeter strength is recessed; the alloy cutter The inner side of the micro-cut surface of the alloy cutter head of the head twist drill forms a micro-strengthened stress extension table with millimeter strength; the micro-cut surface with millimeter strength intersects with the secondary cutting surface of the outer peripheral edge to form a micro-cut with millimeter strength The micro-cut surface with millimeter strength intersects with the rear cutting surface to form a cutting micro-edge with millimeter strength; the micro-strengthened stress extension table with millimeter strength intersects with the rear cutting surface to form a side micro-edge with millimeter strength .

Alloy cutter head twist drill, relates to a drilling tool for machining, including a tool holder, a helical cutter body and an alloy cutter head. The alloy cutter head twist drill is integrally provided with at least two helical cutter bodies, and each helical cutter body is provided with at least two helical cutter bodies. The surface facing the cutting direction is formed as a spiral cutting surface, and the surface on the outer side of the spiral cutting surface backward in the rotation direction is a spiral secondary cutting surface. The surface on the back side of the front end in the axial direction is formed as a rear cutting surface, at least the rear cutting surfaces on both sides intersect to form a chisel edge, the helical cutting surface intersects with the rear cutting surface to form a cutting edge, and the helical secondary cutting surface intersects with the rear cutting surface to form a cutting edge. side edge,

It is characterized in that: the alloy cutter head twist drill is integrally composed of a cutter shank and a helical cutter body, and the front end helical cutting surfaces of at least two helical cutter bodies are grooved and integrally or connected and formed integrally provided with a Alloy cutter head, the alloy cutter head is integrally formed with two cutting surfaces facing the front end of the rotation direction along the axial center of the alloy cutter head twist drill, and the spiral cutting surfaces on both sides of the two integrally arranged helical cutter bodies and The two cutting surfaces integrally provided with the alloy cutter head are respectively arranged in the same groove, the spiral cutting edge extends to the alloy cutter head to form a secondary cutting edge, and the spiral secondary cutting surface extends to the alloy cutter head to form a secondary cutting surface;

On the alloy cutter head of the alloy cutter head twist drill, the following technical solutions are set integrally or connected and formed as a whole, and the inner side of the alloy cutter head cutting surface of the alloy cutter head twist drill is close to the axial center. , a central stepped platform with millimeter strength is erected on the cutting surface; the inner side of the central stepped platform with millimeter strength is set toward the central stepped surface raised in the direction of rotation; the alloy of the alloy cutter head twist drill The central stepped platform with millimeter strength on the cutter head intersects with the rear cutting surface to form a side micro-edge with millimeter strength; the center stepped platform with millimeter strength on the alloy cutter head intersects with the central stepped surface with millimeter strength to form a side micro-edge with millimeter strength. The center edge of 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 alloy cutter head twist drill.

Alloy cutter head twist drill, relates to a drilling tool for machining, including a tool holder, a helical cutter body and an alloy cutter head. The alloy cutter head twist drill is integrally provided with at least two helical cutter bodies, and each helical cutter body is provided with at least two helical cutter bodies. The surface facing the cutting direction is formed as a spiral cutting surface, and the surface on the outer side of the spiral cutting surface backward in the rotation direction is a spiral secondary cutting surface. The surface on the back side of the front end in the axial direction is formed as a rear cutting surface, at least the rear cutting surfaces on both sides intersect to form a chisel edge, the helical cutting surface intersects with the rear cutting surface to form a cutting edge, and the helical secondary cutting surface intersects with the rear cutting surface to form a cutting edge. side edge,

It is characterized in that: the alloy cutter head twist drill is integrally composed of a cutter shank and a helical cutter body, and the front end helical cutting surfaces of at least two helical cutter bodies are grooved and integrally or connected and formed integrally provided with a Alloy cutter head, the alloy cutter head is integrally formed with two cutting surfaces facing the front end of the rotation direction along the axial center of the alloy cutter head twist drill, and the spiral cutting surfaces on both sides of the two integrally arranged helical cutter bodies and The two cutting surfaces integrally provided with the alloy cutter head are respectively arranged in the same groove, the spiral cutting edge extends to the alloy cutter head to form a secondary cutting edge, and the spiral secondary cutting surface extends to the alloy cutter head to form a secondary cutting surface;

On the alloy cutter head of the alloy cutter head twist drill, the following technical solutions are set integrally or connected and formed as a whole, on the alloy cutter head of the alloy cutter head twist drill from the axial center to the outer peripheral edge On the cutting surface of the cutting edge, a step-shaped depression is provided with a millimeter-strength splitting table; the inner convex cutting surface of the millimeter-strength splitting table is a splitting surface, and the splitting surface intersects with the rear cutting surface to form a cutting edge ; The said sub-hole table with millimeter strength intersects with the rear cutting surface to form a side micro-edge with millimeter strength; the top of the sub-hole table with millimeter strength on the alloy cutter head intersects with the inner convex cutting surface to form a A slitting edge with millimeter strength; the width of the slitting surface of the alloy cutter head is greater than or equal to one third of the radius of the alloy cutter head twist drill, and less than or equal to two thirds of the radius of the alloy cutter head twist drill.

Preferably, at least one or more notch edges are provided on the alloy tool tip cutting edge of the alloy tip twist drill; each of the notch edges extends to the rear cutting surface to form a groove.

Preferably, at least one or more stages are arranged on the rear cutting surface where the alloy cutter head of the alloy cutter head is located from the axial center in such a manner that the height of the rear cutting surface in the direction of the outer side edge decreases. A raised step and a raised at least one or more rear cutting face, the raised step intersecting with the cutting face at the front end in the rotational direction to form at least one or more raised step edges, and a raised at least one step. The one or more levels of rear cutting surfaces intersect with the front cutting surfaces in the rotational direction to form at least one or more levels of raised cutting edges.

Preferably, the rear cutting surface on which the alloy cutter head of the alloy-tipped twist drill is located is provided with at least one or more vertical vertical surfaces starting from the axial center in such a manner that the height of the rear cutting surface in the direction of the outer side edge decreases. A raised step and at least one or more levels of raised rear cutting faces, the at least one or more raised steps intersecting with the cutting face at the front end of the rotation direction to form at least one or more raised step edges, At least one or more levels of rear cutting surfaces of the protrusions intersect with the cutting surfaces to form at least one or more levels of raised cutting edges; and the stepped at least one or more levels of alloy cutter head cutting edges are provided with at least one or a plurality of notch edges, each notch edge extending toward the rear cutting face to form a groove.

Preferably, the rear cutting surfaces on both sides of the front end of the alloy cutter head of the alloy cutter head are intersected at the axial center to form a chamfered surface, a chamfered edge and a chisel edge; The back cutting surfaces on both sides of the front end of the alloy cutter head intersect at the axial center to form a chamfered surface, a chamfered edge and a sharp edge without a chisel edge.

Preferably, a cooling hole is integrally provided in the tool shank and the helical cutter body of the alloy cutter head twist drill.

Preferably, the angle at which the outermost cutting edge of the alloy cutter head of the alloy cutter head and the helical secondary cutting edge intersect is an acute angle; or the outermost cutting edge of the alloy cutter head of the alloy cutter head twist drill The intersecting angle between the edge and the helical secondary cutting edge is a right angle; or the intersecting angle between the outermost cutting edge of the alloy cutter head of the alloy cutter head twist drill and the helical secondary cutting edge is an obtuse angle.

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

Beneficial effects:

In the comparative experiment carried out on the drilling machine, a twist drill with a diameter of 10.15 was used as the experiment. The same is M35 cobalt-containing high-speed steel, heat-treated at the same time, and produced in the same batch. The drilling object is forged and tempered gears. The drilling depth is 35mm, the blind hole, and the twist drill speed and feed amount of the ordinary structure reach the limit, the alloy cutter head twist drill can also increase the speed by 25%, increase the feed amount by 25%, and double the comprehensive drilling efficiency. Above, the number of holes drilled by alloy cutter head twist drill is more than three times more than that of twist drill with ordinary structure.

Description of drawings:

The technical solutions and advantages of the present invention will be described in detail with reference to the accompanying drawings, in which:

FIG. 1 is a schematic diagram of an alloy-tip twist drill according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram of an alloy cutter head twist drill according to a second embodiment of the present invention.

FIG. 3 is a schematic diagram of an alloy cutter head twist drill according to a third embodiment of the present invention.

4-5 are schematic diagrams of combined application of the alloy cutter head twist drills according to the first to third embodiments of the present invention.

Detailed ways:

The preferred embodiments of the alloy cutter head twist drill of the present invention will be described in detail below with reference to the accompanying drawings. In Embodiments 1-3, an alloy cutter head twist drill integrally provided with two helical cutter bodies is used as an example for illustration.

Embodiment 1:

As shown in FIG. 1 , the alloy cutter head twist drill 1 according to the first embodiment of the present invention, the alloy cutter head twist drill 1, mainly relates to a drilling tool for machining, and the alloy cutter head twist drill is integrally formed by The tool shank (not shown) includes a tapered shank or a straight shank, and is composed of a helical cutter body 4. The front end helical cutting surfaces of at least two helical cutter bodies 4 are grooved and integrally or connected and formed integrally provided with an alloy The cutter head 31, the alloy cutter head 31 is integrally formed with the cutting surface 13 toward the front end of the rotation direction along the axial center of the alloy cutter head twist drill 1, and the two sides of the two helical cutter bodies 4 are integrally provided for helical cutting. The two cutting surfaces 13 integrally provided with the alloy cutter head 31 are respectively provided with the same groove;

The alloy cutter head twist drill 1 is integrally provided with two helical cutter bodies 4 , and the face facing the cutting direction on the alloy cutter head 31 of each helical cutter body 4 is formed as a cutting face 13 , and the cutting face 13 is rearward in the rotational direction. The surface on the outer side is the minor cutting surface 8, the cutting surface 13 intersects the minor cutting surface 8 to form a helical cutting edge, the surface on the back side of the front end of the cutting surface 13 in the axial direction is formed as the rear cutting surface 5, and at least the rear cutting surfaces on both sides are formed. The intersection is formed with a chisel edge, the two ends of the chisel edge are chamfered to form a chamfered surface 22 and a chamfered edge 2, the cutting surface 13 intersects with the rear cutting surface 5 to form a cutting edge 6, and the minor cutting surface 8 intersects with the rear cutting surface 5. A side edge 7 is formed, the helical cutting edge extends to the alloy cutter head 31 to form a minor cutting edge, and the helical minor cutting surface 8 extends to the alloy cutter head 31 to form the minor cutting surface 8 of the alloy cutter head 31 , or is combined with the alloy cutter head 31 The secondary cutting surface 8 protrudes from the helical secondary cutting surface 8;

The alloy cutter head twist drill 1 is provided with a micro-cut surface 18 with millimeter strength along the outer periphery of the alloy cutter head 31. The helical cutting edge 17 begins to be recessed on the cutting surface 13 of the alloy cutter head 31 in the axial center direction; The inner side of the micro-cut surface 18 of the alloy cutter head 31 of the cutter head twist drill 1 stands up to form a micro-strengthened stress extension table 20 with millimeter strength; the micro-cut surface 18 with millimeter strength intersects with the secondary cutting surface 8 of the outer periphery to form The micro-cutting edge 17 with millimeter strength; the micro-cut surface 18 with millimeter strength on the alloy cutter head 31 intersects with the rear cutting surface 5 to form a cutting micro-edge 16 with millimeter strength; the alloy cutter head 31 has a millimeter-strength cutting edge 16 The strength of the micro-strengthened stress development station 20 intersects the rear cutting face 5 to form a side micro-edge 19 with millimeter strength.

The above arrangement is equivalent to punching a process hole before drilling during the drilling process. Since the micro-strengthened stress extension table 20 with millimeter strength is provided to enhance the strength of the micro-cut surface 18 with millimeter strength, the The micro-section 18 itself has the characteristics of being small and strong due to the smaller area. The characteristic is that the average strength of the surface area on one side of the same material in millimeters is greater than centimeters, and centimeters are greater than decimeters. 1 cubic centimeter = 1 thousand cubic millimeters, and area is 1 cubic centimeter of surface area = 600 square millimeters of surface area, 1 thousand cubic millimeters of surface area is 6 thousand square millimeters, and the average force applied by volume in 1 cubic centimeter is 1 thousand cubic millimeters One-tenth of the surface area calculated, so the millimeter-level pressure bearing limit is much larger than that of the centimeter-level, plus the force extended by the spiral micro-strengthened stress extension table 20 with millimeter-strength, which supports and strengthens the micro-strength with millimeter-strength. The effect of the strength of the cut surface 18, so the setting on the same tool has high strength and stability. Compared with ordinary reaming drills, it has the advantages of more durability and stability of strength and edge, so it has the advantage of high efficiency. The hole accuracy is also higher.

According to the above structure, since drilling and cutting is a circular motion, centrifugal force is generated in the process of circular motion. The cutting edge 6 forms a transmission carrier of centrifugal force. The micro-cutting edge 17 and the side micro-edge 19 formed by the intersection of the micro-cut surface 18 and the rear cutting surface separate the cutting edge 6, and the side micro-edge 19 and the micro-strengthened stress extension table 20 form a composite positioning function, which differentiates the cutting force and reduces the cutting force. The overall cutting force is reduced, the external cutting surface, that is, the micro-cutting edge 17 and the inner cutting edge 6 intersecting the micro-cut surface 18 and the rear cutting surface, are reduced to the greatest extent. The force of the cutting edge of the fragile outer end prolongs the service life of the tool and maintains high strength during the machining process.

In the comparative experiment carried out on the drilling machine, a twist drill with a diameter of 10.5 is used as the experiment, and the same is M35 cobalt-containing high-speed steel, heat-treated at the same time, produced in the same batch, and the drilling object is forged and tempered gears. Drilling depth 35mm, blind hole, alloy cutter head twist drill 1 has a micro-cut surface 18 with a width of 1.5mm, and a micro-strengthened stress extension table 20 with a height of 0.6mm. Under the circumstance that the rotational speed and feed amount of the twist drill with ordinary structure reach the limit, the alloy The cutter head twist drill 1 can also increase the speed by 25%, increase the feed amount by 25%, and increase the comprehensive drilling efficiency by 0.56 times. The number of holes of the alloy cutter head twist drill 1 is more than seven times more than that of the ordinary structure twist drill.

According to the above experimental results, the use efficiency and service life of the twist drill are significantly improved, which proves that this structure is an effective way to prolong the service life and improve the efficiency.

Embodiment 2:

As shown in FIG. 2 , the alloy cutter head twist drill 1 according to the second embodiment of the present invention is comprehensively used on the basis of the first embodiment, and relates to a drilling tool for machining. The alloy cutter head twist drill is integrally composed of a cutter shank (not shown) including a tapered shank or a straight shank, and a helical cutter body 4. The front end helical cutting surfaces of at least two helical cutter bodies 4 are grooved and integrally or connected. An alloy cutter head 31 is integrally formed, and the alloy cutter head 31 is integrally formed with a cutting surface 13 toward the front end of the rotation direction along the axial center of the alloy cutter head twist drill 1. Two integrally provided cutting surfaces 13 are formed. The two helical cutting surfaces 13 on both sides of the helical cutter body 4 and the two cutting surfaces 13 integrally provided with the alloy cutter head 31 are respectively provided with the same groove;

The alloy cutter head twist drill 1 is integrally provided with two helical cutter bodies 4 , and the face facing the cutting direction on the alloy cutter head 31 of each helical cutter body 4 is formed as a cutting face 13 , and the cutting face 13 is rearward in the rotational direction. The surface on the outer side is the minor cutting surface 8, the cutting surface 13 intersects the minor cutting surface 8 to form a helical cutting edge, the surface on the back side of the front end of the cutting surface 13 in the axial direction is formed as the rear cutting surface 5, and at least the rear cutting surfaces on both sides are formed. The intersection is formed with a chisel edge, the two ends of the chisel edge are chamfered to form a chamfered surface 22 and a chamfered edge 2, the cutting surface 13 intersects with the rear cutting surface 5 to form a cutting edge 6, and the minor cutting surface 8 intersects with the rear cutting surface 5. A side edge 7 is formed, the spiral cutting edge extends to the alloy cutter head 31 to form a minor cutting edge, and the helical minor cutting surface 8 extends to the alloy cutter head 31 to form the minor cutting surface 8 of the alloy cutter head 31;

On the inner side of the cutting surface 13 of the alloy cutter head 31 of the alloy cutter head twist drill 1 near the axial center O, a central stepped platform 10 with millimeter strength and a raised central stepped surface 12 are erected. On the cutting surface 13 of the 31, the central stepped platform 10 with millimeter strength is connected, and an included angle greater than or equal to 90° is formed between the central stepped platform 10 with millimeter strength on the alloy cutter head 31 and the intersecting central stepped surface 12, The central stepped platform 10 with millimeter strength on the alloy cutter head 31 intersects with the adjacent cutting surface 13 to form an included angle of greater than or equal to 90°, and the central stepped platform 10 with millimeter strength on the alloy cutter head 31 intersects with the central stepped surface 12 The center edge 11 with millimeter strength is formed, the center step table 10 and the center step surface 12 with millimeter strength on the alloy cutter head 31 extend along the axial direction and the front end intersects with the rear cutting surface 5 to form a side micro-edge 19 and a middle cutting edge. 3;

The inner side of the central stepped platform 10 with millimeter strength on the alloy cutter head 31 is provided with a central stepped surface 12 that protrudes in the direction of rotation; the width of the central stepped surface 12 on the alloy cutter head 31 is less than or equal to the alloy cutter head. Twist drill 1/3 of the radius.

The above setting is equivalent to punching a process hole before drilling during the drilling process. Because it is set on the same tool, it has high stability. Compared with ordinary reaming drills, it has a more stable advantage, so it has The advantage of high efficiency, the drilling accuracy is also higher.

In the comparative experiment carried out on the drilling machine, a twist drill with a diameter of 10.15 is used as the experiment, both of which are M35 containing high-speed steel, heat-treated at the same time, and produced in the same batch. The drilling object is forged and tempered gears. The hole depth is 35mm, blind hole, the cutting surface 13 of the alloy cutter head twist drill 1 is 3.5mm wide, and the center step table 10 is 0.6mm high. When the rotational speed and feed amount of the ordinary structure twist drill reach the limit, the alloy cutter head twist drill Drill 1 can also increase the speed by 25%, increase the feed rate by 25%, and increase the comprehensive drilling efficiency by 0.56 times. The ordinary structure of the alloy cutter head twist drill 1 drills 731 holes, the alloy cutter head twist drill 1 drills 3698 holes, and the drill The number of holes is more than four times more than that of the diameter-shift twist drill than the twist drill of ordinary structure.

Embodiment 3:

As shown in FIG. 3 , the alloy cutter head twist drill 1 of the third embodiment of the present invention is comprehensively used on the basis of the first and second embodiments, and mainly relates to drilling holes for machining. The tool, the alloy cutter head twist drill is integrally composed of a tool shank (not shown) including a tapered shank or a straight shank, and a helical cutter body 4, and the front end helical cutting surfaces of at least two helical cutter bodies 4 are milled and grooved. An alloy cutter head 31 is provided integrally or coupled and integrally formed. The alloy cutter head 31 is integrally formed with a cutting face 13 toward the front end of the rotation direction along the axial center of the alloy cutter head twist drill 1. The two helical cutting surfaces 13 on both sides of the provided two helical cutter bodies 4 are respectively provided in the same groove with the two cutting surfaces 13 integrally provided with the alloy cutter head 31;

The alloy cutter head twist drill 1 is integrally provided with two helical cutter bodies 4 , and the face facing the cutting direction on the alloy cutter head 31 of each helical cutter body 4 is formed as a cutting face 13 , and the cutting face 13 is rearward in the rotational direction. The surface on the outer side is the minor cutting surface 8, the cutting surface 13 intersects the minor cutting surface 8 to form a helical cutting edge, the surface on the back side of the front end of the cutting surface 13 in the axial direction is formed as the rear cutting surface 5, and at least the rear cutting surfaces on both sides are formed. The intersection is formed with a chisel edge, the two ends of the chisel edge are chamfered to form a chamfered surface 22 and a chamfered edge 2, the cutting surface 13 intersects with the rear cutting surface 5 to form a cutting edge 6, and the minor cutting surface 8 intersects with the rear cutting surface 5. A side edge 7 is formed, the spiral cutting edge extends to the alloy cutter head 31 to form a minor cutting edge, and the helical minor cutting surface 8 extends to the alloy cutter head 31 to form the minor cutting surface 8 of the alloy cutter head 31;

On the cutting surface 13 of the alloy cutter head 31 of the alloy cutter head twist drill 1, from the vicinity of the axial center to the vicinity of the radius center of the minor cutting surface 8 and the helical line extending parallel to the helical cutting edge at or near the center of the radius, The sub-hole table 23 and the splitting surface 24 with millimeter strength are formed to form the stepped protrusions, the upright connection on the cutting surface 13 of the alloy cutter head 31 has the millimeter strength of the sub-hole table 23, and the alloy cutter head 31 has a millimeter strength There is an included angle greater than or equal to 90° between the splitting table 23 and the adjacent splitting surface 24, and the splitting table 23 with millimeter strength on the alloy cutter head 31 intersects with the cutting surface 13 adjacent to the inner protrusion to form an angle greater than or equal to 90°. The included angle is equal to 90°, the slitting surface 24 intersects the slitting table 23 with millimeter strength to form a slitting edge 26, and the slitting surface 24 and the slitting table 23 with millimeter strength intersect with the rear cutting surface 5 to form a cutting edge 6 and side microblades 19;

The upper inner convex cutting surface 13 of the splitting table 23 with millimeter strength on the alloy cutter head 31 is the cutting surface 24, and the width of the cutting surface 24 is greater than or equal to one third of the radius of the alloy cutter head twist drill 1, Less than or equal to two-thirds of the radius of the alloy tip twist drill 1.

In the comparative experiment carried out on the drilling machine, a twist drill with a diameter of 10.5 is used as the experiment, and the same is M35 cobalt-containing high-speed steel, heat-treated at the same time, produced in the same batch, and the drilling object is forged and tempered gears. Drilling depth 35mm, blind hole, alloy cutter head twist drill 1's splitting surface 24 is 2.5mm wide, and split hole table 23 is 0.8mm high. Under the circumstance that the twist drill speed and feed amount of ordinary structure reach the limit, alloy cutter head Twist drill 1 can also increase the speed by 20%, increase the feed amount by 20%, and increase the comprehensive drilling efficiency by 0.44 times. The ordinary structure of the twist drill can drill 412 holes, and the alloy cutter head twist drill 1 can drill 2676 holes. The number of holes is higher than The alloy cutter head twist drill 1 is more than five times more than the ordinary structure twist drill.

As shown in FIGS. 4-5 , the embodiments of the present invention are comprehensively and selectively used on the basis of the first to third embodiments, and at least one recess is provided on the cutting edge 6 of the alloy cutter head 31 of the alloy cutter head twist drill 1 The notch edge 29, the notch edge 29 extends to the rear cutting surface to form a groove 30;

Alternatively, a plurality of notch edges 29 may be provided on the alloy cutter head cutting edge 6 of the alloy cutter head twist drill, and each notch edge 29 extends to the rear cutting surface to form a groove 30 .

Or on the back cutting surface 5 where the alloy cutter head of the alloy cutter head is located, starting from the axial center, at least one level of upright steps is arranged in a manner that the height of the back cutting surface 5 in the direction of the outer side edge 7 decreases. 27 and at least one level of raised rear cutting surface 5, the at least one level of raised step 27 intersects with the cutting surface 13 at the front end of the rotation direction to form at least one level of raised step edge 28, and at least one level of raised step 27 The rear cutting surface 5 intersects with the cutting surface 13 at the front end in the rotational direction to form at least one-stage raised cutting edge 6 .

Or on the back cutting surface 5 where the alloy cutter head of the alloy cutter head is located, starting from the axial center, a multi-stage upright is arranged in such a way that the height of the back cutting surface 5 in the direction of the outer side edge 7 decreases. The step 27 and the raised multi-stage rear cutting surface 5, the multi-stage raised step 27 intersects with the cutting surface 13 at the front end of the rotation direction to form a multi-stage raised step edge 28, and the raised multi-stage rear cutting surface 5. It intersects with the cutting surface 13 at the front end of the rotation direction to form a multi-level raised cutting edge 6;

Or set at least one level or more on the back cutting surface 5 where the alloy cutter head of the alloy cutter head is located, starting from the axial center, in a manner that the height of the back cutting surface 5 in the direction of the outer side edge 7 decreases. A raised step 27 and at least one or more raised rear cutting surfaces 5, the at least one or more raised steps 27 intersect with the cutting surface 13 at the front end in the rotational direction to form at least one or more steps A raised stepped edge 28, and at least one or more levels of raised rear cutting surfaces 5 intersect the cutting surface 13 to form at least one or more levels of raised cutting edges 6; and stepped at least one or more levels The cutting edge 6 is provided with at least one or more notch edges 29, and each notch edge is formed with a groove 30 extending toward the rear cutting surface.

By setting the alloy cutter head 31 of the alloy cutter head twist drill 1 on the cutting edge 6, the notch edge 29 that breaks chips and decomposes the cutting force is extended to the rear cutting surface to form a groove 30. The combined arrangement can maximize the use of the alloy cutter head twist Cutting efficiency and service life of drill 1.

By arranging the stepped raised step 27 on the rear cutting surface 5 of the alloy cutter head 31 of the alloy cutter head twist drill 1, the stability of the alloy cutter head twist drill 1 during drilling is effectively improved, the cutting resistance is decomposed, and the cutting resistance is improved. The cutting efficiency and service life of the alloy cutter head twist drill 1.

On the basis of the first to third embodiments, the included angle where the cutting edge 6 of the outermost alloy cutter head 31 of the alloy cutter head twist drill 1 and the helical secondary cutting edge 14 intersect is an acute angle; or The angle that the outermost alloy cutter head 31 cutting edge 6 of the described alloy cutter head twist drill intersects with the helical secondary cutting edge 14 is a right angle; or the outermost alloy cutter head 31 cutting edge 6 of the described alloy cutter head twist drill The included angle where the helical minor cutting edges 14 intersect is an obtuse angle.

On the rear cutting surfaces 5 on both sides of the front end of the alloy cutter head 31 of the alloy cutter head twist drill 1, a chamfered surface 22, a chamfered edge 24 and a chisel edge 3 are formed at the intersection in the axial center; or the alloy cutter head On the rear cutting surfaces on both sides of the front end of the alloy cutter head of the twist drill, a chamfering surface 22 and a chamfering surface 22 without a chisel edge, a chamfering edge 24 and a sharp edge O are formed intersecting at the axial center.

A cooling hole 32 is integrally provided in the tool shank and the helical cutter body of the alloy cutter head twist drill 1 .

The tool shank (not shown) of the alloy cutter head twist drill 1 is a straight shank; or the tool shank (not shown) of the alloy cutter head twist drill 1 is a tapered shank.

According to the above experimental results, the use efficiency and service life of the twist drill are significantly improved, which proves that this structure is an effective way to prolong the service life and improve the efficiency.

Although the tool with two helical cutter bodies 4 has been described above as an example, the cutter of the present invention may also have a plurality of helical cutter bodies 4, and the structure and combination of other forms.

The preferred embodiments described above are illustrative rather than restrictive, and the present invention may be implemented and embodied in other ways without departing from the gist and essential characteristics of the present invention, and the scope of the present invention is determined by the rights The claims define, and all modifications within the scope of the claims fall within the scope of the invention.

Claims (10)

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,

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.

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,

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.

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,

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 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.

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.

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