Three-edge drill bit structure

Abstract

The three-blade drill bit structure comprises a drill body and a three-blade tool bit, the drill body comprises a clamping section, a chip removal spiral section and a blade section, a chip removal groove is formed in the outer wall of the blade section, a tool bit installation clamping groove is formed in the end of the blade section, and the tool bit installation clamping groove and the chip removal groove are arranged in a staggered mode; the middle of the bottom wall of the tool bit installation clamping groove is a plane, and the edge of the bottom wall of the tool bit installation clamping groove is a downward inclined face. The middle part of the bottom surface of the three-blade tool bit is a horizontal matching surface; an inclined convex blade edge is arranged at the edge of the bottom surface of the three-blade tool bit; the three-blade tool bit is clamped in the tool bit installation clamping groove and is welded and fixed, the plane is attached to the horizontal matching face, and the inclined edge of the inclined convex blade edge is attached to the downward inclined face. The three-blade drill bit is reasonable in structural arrangement, the contact area of the three-blade tool bit and the drill body can be increased, the strength and stability of the whole structure can be improved, the torsion of the drill bit can be increased, damage or head flat breakage is not prone to occurring in the using process, and the overall using stability can be improved.

Description

Technical Field

[0001] The invention belongs to the technical field of drill bits, and in particular relates to a three-edged drill bit structure. Background Art

[0002] A drill bit is a common drilling and cutting structure, which is mainly used in conjunction with tools such as electric hammer drills to complete drilling and cutting operations by rotating the drill bit. A three-blade drill bit is a common drill bit structure, which includes a spiral cutter body and a three-blade cutter head arranged at the end of the spiral cutter body. Although it can meet the general use requirements, the spiral cutter body and the three-blade cutter head are integrally formed, which will greatly increase the processing cost. The spiral cutter body and the three-blade cutter head are separately arranged. For example, the Chinese patent application number is: CN202210109164.2, and the patent name is: A three-blade drill bit, including a rod-shaped cutter body and three cutter heads arranged at the working end of the cutter body, the three cutter heads extend radially and are distributed radially, the inner ends of the three cutter heads intersect at the central axis position, the top of each cutter head is provided with a cutting edge extending from the outside to the inside, the front side of the cutting edge is provided with a cutting front side, and the rear side of the cutting edge is provided with a cutting back side, the cutting front sides of each cutter head are arranged in the same direction, and the cutting edges are arranged inclined, and the inner ends of the three cutting edges intersect at the central axis position to form the apex of the tip. During processing, a corresponding three-blade groove needs to be opened on the spiral cutter body, and the bottom wall of the three-blade groove needs to be processed into a plane. Although this can reduce the processing cost, the three-blade cutter head not only has a more complex structure, which greatly increases the processing cost, but also the connection between the spiral cutter body and the three-blade cutter head is prone to head damage or breakage during use, which will affect the stability and reliability of the overall drill bit to a certain extent. Summary of the invention

[0003] The purpose of the present invention is to provide a three-edge drill bit structure which has a reasonable structural arrangement and is conducive to improving the stability of use.

[0004] The technical solution to achieve the purpose of the present invention is a three-edge drill structure, including a drill body and a three-edge cutter head, the drill body includes a clamping section, a chip removal spiral section and a blade section, the outer wall of the blade section is provided with a chip removal groove, the chip removal groove is connected to the chip removal spiral groove of the chip removal spiral section;

[0005] A cutter head mounting slot is provided at the end of the blade section, and the cutter head mounting slot is staggered with the chip removal groove;

[0006] The middle part of the bottom wall of the tool head mounting slot is a plane, and the edge of the bottom wall of the tool head mounting slot is a downwardly inclined surface, and the high end of the downwardly inclined surface is at the edge of the plane;

[0007] The middle part of the bottom surface of the three-edged blade head is a horizontal mating surface, and an inclined convex blade edge is integrally formed at the edge of the bottom surface of the three-edged blade head;

[0008] The three-edged blade head is clamped in the blade head mounting slot and fixed by welding, and the plane is fitted with the horizontal matching surface, and the inclined edge of the inclined convex blade edge is fitted with the downward inclined surface.

[0009] It is further preferred that: the groove includes a straight groove portion, a triangular guide groove portion and an inclined groove portion;

[0010] One end of the straight groove portion is connected to the end of the spiral groove of the spiral segment, and the triangular guide groove portion is arranged on one side of the connection between the straight groove portion and the spiral groove, and the inclined high end of the inclined groove portion is connected to the other end of the straight groove portion.

[0011] More preferably, the angle between the downwardly inclined surface and the plane is 120-170 degrees.

[0012] It is further preferred that: the thickness of the blade portion of the three-blade blade head matches the width of the blade head mounting slot, the height of the blade portion of the three-blade blade head is greater than the depth of the blade head mounting slot and the edge of the blade portion of the three-blade blade head protrudes from the outer surface of the blade section.

[0013] It is further preferred that: the solder used to weld and fix the three-blade cutter head and the cutter head mounting slot is a copper-nickel-manganese welding wire.

[0014] It is further preferred that the cross-sections of the straight groove portion and the inclined groove portion are both semicircular.

[0015] It is further preferred that the three-edged blade head is a YG8 alloy blade head.

[0016] The present invention has positive effects: the structure of the present invention is reasonably arranged, the middle part of the bottom wall of the cutter head mounting slot is a plane, the edge of the bottom wall of the cutter head mounting slot is a downwardly inclined surface, and the inclined high end of the downwardly inclined surface is at the edge of the plane. Through the above structure, since the middle part of the bottom wall of the cutter head mounting slot is a plane and the side edge is a downwardly inclined surface, the strength and toughness of the side wall of the cutter head mounting slot can be guaranteed, and the middle part of the bottom surface of the three-blade cutter head is a horizontal matching surface, and the bottom surface edge of the three-blade cutter head is integrally formed with an inclined convex blade edge; during processing, the three-blade cutter head is clamped in the cutter head mounting slot and welded and fixed. Through the above structure, the connection contact area between the three-blade cutter head and the drill body can be increased, which is beneficial to improving the strength and stability of the overall structure, and the bottom surface of the downwardly inclined surface and the inclined convex blade edge is also beneficial to increasing the torque of the drill bit, and it is not easy to be damaged or the head is broken during use, which is beneficial to improving the overall stability of use and service life;

[0017] At the same time, the groove includes a straight groove portion, a triangular guide groove portion and an inclined groove portion, and the cross-sections of the straight groove portion and the inclined groove portion are both semicircular. Through the above structure, the inclined groove portion is conducive to improving the effectiveness and smoothness of chip removal, which is conducive to improving the efficiency of drilling;

[0018] In addition, the solder used to weld and fix the three-edged blade head and the blade head mounting slot is copper-nickel-manganese welding wire, which can improve the welding firmness and has strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments and in conjunction with the accompanying drawings, wherein:

[0020] Figure 1 It is a structural schematic diagram of the present invention;

[0021] Figure 2 It is a schematic diagram of the split structure of the present invention;

[0022] Figure 3 It is a schematic diagram of the specific structure of the three-edged blade head in the present invention;

[0023] Figure 4 It is a schematic diagram of the specific structure of the drill body in the present invention.

[0024] Figure numerals: drill body 1, clamping section 11, chip removal spiral section 12, blade section 13, three-edged cutter head 2, chip removal groove 3, straight groove portion 31, triangular guide groove portion 32, inclined groove portion 33, cutter head mounting slot 4, plane 5, downward inclined surface 6, horizontal mating surface 7, inclined convex blade edge 8. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Example

[0027] See Figures 1 to 4 As shown, a three-edge drill structure includes a drill body 1 and a three-edge cutter head 2. The drill body includes a clamping section 11, a chip removal spiral section 12 and a cutter head 13. In this embodiment, the drill body is a conventional material structure of the prior art, and the three-edge cutter head is a YG8 alloy cutter head. Therefore, it is not recorded in detail; the chip removal spiral groove depth and width of the chip removal spiral section can be processed as needed, and are simply applied.

[0028] In actual application, a chip removal groove 3 is provided on the outer wall of the blade segment, and the chip removal groove is connected with the chip removal spiral groove of the chip removal spiral segment; the chip removal groove cooperates with the chip removal spiral groove of the chip removal spiral segment to realize chip removal operation, and a cutter head mounting groove 4 is provided at the end of the blade segment, and the cutter head mounting groove is staggered with the chip removal groove; through the above structure, the overall strength and toughness of the drill bit can be guaranteed.

[0029] Moreover, in this embodiment, the middle part of the bottom wall of the cutter head installation slot is a plane 5, and the bottom wall edge of the cutter head installation slot is a downward inclined surface 6, and the inclined high end of the downward inclined surface is at the edge of the plane; through the above structure, the side wall strength and toughness of the cutter head installation slot of the drill body can be increased, and the welding contact area with the three-edged cutter head can also be increased to ensure the strength and reliability of the welding. When processing this embodiment, firstly, three inclined grooves are milled at the end of the drill body, and then the center of the three inclined grooves is partially milled to form a plane, thereby reducing the processing efficiency, and it is not easy to be damaged or the head is broken, ensuring the stability and reliability of use.

[0030] Moreover, in actual application, the middle part of the bottom surface of the three-blade cutter head is a horizontal mating surface 7, and an inclined convex edge 8 is integrally formed at the bottom edge of the three-blade cutter head; during processing, the three-blade cutter head is clamped in the cutter head mounting slot and fixed by welding, and the plane is fitted with the horizontal mating surface, and the inclined edge of the inclined convex edge is fitted with the downward inclined surface. The solder used to weld and fix the three-blade cutter head and the cutter head mounting slot is copper-nickel-manganese welding wire. The high temperature resistance is 1030°C. Through the above structure, the firmness of welding can be improved.

[0031] In actual application, the groove 3 includes a straight groove portion 31, a triangular guide groove portion 32 and an inclined groove portion 33; during processing, one end of the straight groove portion is connected to the end of the spiral groove of the spiral segment, and the triangular guide groove portion is arranged on one side of the connection between the straight groove portion and the spiral groove, and the inclined high end of the inclined groove portion is connected to the other end of the straight groove portion. The cross-sections of the straight groove portion and the inclined groove portion are both semicircular. The three sides of the triangular guide groove portion are all arc-shaped sides, and the overall shape of the triangular guide groove composed of three arc-shaped sides is a concave spherical groove. Through the above structure, the effectiveness and stability of chip removal can be improved. When the drill bit is drilling, the drill body rotates upward to discharge powder faster and more conveniently, thereby improving the efficiency of drilling.

[0032] In actual application, the angle between the downwardly inclined surface and the plane is 120-170 degrees.

[0033] In actual application, the thickness of the blade of the three-blade cutter head matches the width of the cutter head mounting slot, the height of the blade of the three-blade cutter head is greater than the depth of the cutter head mounting slot, and the edge of the blade of the three-blade cutter head protrudes from the outer surface of the blade section. Through the above structure, the effectiveness and smoothness of drilling can be improved.

[0034] The present invention has positive effects: the structure of the present invention is reasonably arranged, the middle part of the bottom wall of the cutter head mounting slot is a plane, the edge of the bottom wall of the cutter head mounting slot is a downwardly inclined surface, and the inclined high end of the downwardly inclined surface is at the edge of the plane. Through the above structure, since the middle part of the bottom wall of the cutter head mounting slot is a plane and the side edge is a downwardly inclined surface, the strength and toughness of the side wall of the cutter head mounting slot can be guaranteed, and the middle part of the bottom surface of the three-blade cutter head is a horizontal matching surface, and the bottom surface edge of the three-blade cutter head is integrally formed with an inclined convex blade edge; during processing, the three-blade cutter head is clamped in the cutter head mounting slot and welded and fixed. Through the above structure, the connection contact area between the three-blade cutter head and the drill body can be increased, which is beneficial to improving the strength and stability of the overall structure, and the bottom surface of the downwardly inclined surface and the inclined convex blade edge is also beneficial to increasing the torque of the drill bit, and it is not easy to be damaged or the head is broken during use, which is beneficial to improving the overall stability of use and service life;

[0035] At the same time, the groove includes a straight groove portion, a triangular guide groove portion and an inclined groove portion, and the cross-sections of the straight groove portion and the inclined groove portion are both semicircular. Through the above structure, the inclined groove portion is conducive to improving the effectiveness and smoothness of chip removal, which is conducive to improving the efficiency of drilling;

[0036] In addition, the solder used to weld and fix the three-edged blade head and the blade head mounting slot is copper-nickel-manganese welding wire, which can improve the welding firmness and has strong practicality.

[0037] The standard parts used in this embodiment can be purchased directly from the market, and the non-standard structural components recorded in the specification can also be directly processed according to existing technical common sense. At the same time, the connection method of each component adopts the mature conventional means in the prior art, and the machinery, parts and equipment all adopt the conventional models in the prior art, so no specific description will be given here.

[0038] Obviously, the above embodiments of the present invention are merely examples for clearly explaining the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. However, these obvious changes or modifications derived from the essential spirit of the present invention still fall within the protection scope of the present invention.

Claims

1. A three-edged drill bit structure, comprising a drill body and a three-edged cutter head, wherein the drill body comprises a clamping section, a chip removal spiral section and a cutter section, characterized in that: A chip removal groove is provided on the outer wall of the blade segment, and the chip removal groove is connected to the chip removal spiral groove of the chip removal spiral segment; A cutter head mounting slot is provided at the end of the blade section, and the cutter head mounting slot is staggered with the chip removal groove; The middle part of the bottom wall of the tool head mounting slot is a plane, the edge of the bottom wall of the tool head mounting slot is a downward inclined surface, and the high end of the downward inclined surface is at the edge of the plane; The middle part of the bottom surface of the three-edged blade head is a horizontal mating surface, and an inclined convex blade edge is integrally formed at the edge of the bottom surface of the three-edged blade head; The three-edged blade head is clamped in the blade head mounting slot and fixed by welding, and the plane is fitted with the horizontal matching surface, and the inclined edge of the inclined convex blade edge is fitted with the downward inclined surface.

2. A three-edged drill bit structure according to claim 1, characterized in that: The groove includes a straight groove portion, a triangular guide groove portion and an inclined groove portion; One end of the straight groove portion is connected to the end of the spiral groove of the spiral segment, and the triangular guide groove portion is arranged on one side of the connection between the straight groove portion and the spiral groove, and the inclined high end of the inclined groove portion is connected to the other end of the straight groove portion.

3. A three-edged drill bit structure according to claim 1, characterized in that: The angle between the downwardly inclined surface and the plane is 120-170 degrees.

4. A three-edged drill bit structure according to claim 1, characterized in that: The thickness of the blade of the three-blade blade head matches the width of the blade mounting slot, the height of the blade of the three-blade blade head is greater than the depth of the blade mounting slot, and the edge of the blade of the three-blade blade head protrudes from the outer surface of the blade section.

5. A three-edged drill bit structure according to claim 1, characterized in that: The solder used to weld and fix the three-blade cutter head and the cutter head mounting slot is copper-nickel-manganese welding wire.

6. A three-edged drill bit structure according to claim 2, characterized in that: The cross sections of the straight groove portion and the inclined groove portion are both semicircular.

7. A three-edged drill bit structure according to claim 1, characterized in that: The three-edged blade head is a YG8 alloy blade head.

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