CN214920776U

CN214920776U - Rotary positioning tool-changing head type drill bit

Info

Publication number: CN214920776U
Application number: CN202121065926.0U
Authority: CN
Inventors: 赵鑫; 金富华
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-05-18
Filing date: 2021-05-18
Publication date: 2021-11-30
Anticipated expiration: 2031-05-18

Abstract

The utility model discloses a rotational positioning interchangeable tool bit formula drill bit, including interchangeable tool bit formula drill bit, interchangeable tool bit formula drill bit includes the steel cutter arbor and installs in the alloy cutter head of steel cutter arbor tip, alloy cutter head top machine-shaping has drill point negative relief angle, one side machine-shaping of alloy cutter head has vice locating surface of circular arc and the lower extreme is fixed with the central location cylinder axle, machine-shaping has rake face chip groove and main cutting edge on the alloy cutter head, the outside machine-shaping of main cutting edge has the back knife face, 2 axial slope main locating plane have vertically been seted up at the edge of back knife face, machine-shaping has the screw fastening plane on the central location cylinder axle, it has bottom horizontal location face to set up torsion draw-in groove and below machine-shaping on the alloy cutter head. The utility model discloses structure to interchangeable tool bit formula drill bit has optimized, makes things convenient for the tool bit formula drill bit to carry out the dismouting to reach stable firm assembly.

Description

Rotary positioning tool-changing head type drill bit

Technical Field

The utility model relates to a drill bit technical field specifically is a but rotational positioning tool changing head formula drill bit.

Background

In machining, for high precision and high efficiency, high speed steel drill bits have been developed into hard alloy drill bits, replaceable-blade U-shaped drill bits, and the like. Cemented carbide drill bits are typically monolithic and the raw materials are expensive. The U-drill efficiency is not as high as that of a solid carbide drill bit. When the processed hole is relatively deep, particularly the length-diameter ratio reaches 5-8 times of the diameter and above, the integral hard alloy drill bit is easy to break during processing, and the U drill bit is difficult to ensure the size and the processing efficiency of the processed hole. The rotary positioning drill bit with the replaceable hard alloy cutter head solves the problems. The hard alloy cutter head is assembled on the steel product cutter bar, so that the high machining efficiency and the high hole precision can be kept, and the efficiency is even higher than that of an integral hard alloy drill bit; but also can avoid the risk of breaking the whole hard alloy drill bit; and the cost and the tungsten carbide resource can be saved. The replaceable drill for hole machining has high cost performance and high machining efficiency.

There are similar interchangeable carbide tipped bits in the market today, such as: 1) the patent No. CN204565232U does not use the interference fit between a screw cutter head and a cutter rod to self-lock; 2) the patent No. CN20465756U, the cutter head is fastened by a screw to be matched and locked with the cutter bar; 3) the American Kennel metal (KENNAMETAL) is positioned through a clamping groove type, the bottom of the cutter head is connected with the cutter rod through threads to be tightly clamped, and the following technical problems exist in the using process: (1) although the tool changing head is fast in the first matching mode, after the tool changing head and the tool bar are in interference fit, after a drill hole is subjected to torsion friction and the tool bar is deformed due to the friction of the tool head, the tool bar is frequently subjected to fatigue failure after more than ten tool heads are replaced, self-locking failure is caused, the tool bar needs to be replaced, on one hand, the cost is high, and on the other hand, uncertain risks exist in the machining process; (2) the second matching mode is that the cutter bar and the cutter head are laterally fastened through the screw, so that stable clamping of the cutter bar and the cutter head is damaged, axial force is applied to the screw during drilling, and the cutter head is easy to loosen after the screw deforms, so that the service life of the cutter head is influenced; (3) the third kind of cooperation mode clamping fitting surface is stable, and the screw only hangs the tool bit, does not receive the axial force when drilling, so earlier two kinds are more stable, nevertheless change the tool bit at every turn and need stretch into the cutter arbor with special spanner of extension, and the elasticity screw is comparatively loaded down with trivial details, can waste more time to influence efficiency. For this reason, a corresponding technical scheme needs to be designed to solve the existing technical problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a but rotational positioning tool changing head formula drill bit has solved among the background art to the relatively poor and dismouting inconvenience of drill bit result of use, this technical problem.

In order to achieve the above object, the utility model provides a following technical scheme: a rotary positioning drill bit with an interchangeable tool bit comprises the drill bit with the interchangeable tool bit, wherein the drill bit with the interchangeable tool bit comprises a steel tool bar and an alloy tool bit arranged at the end part of the steel tool bar, the top of the alloy tool bit is machined and formed with a negative relief angle of a drill tip, one side of the alloy tool bit is machined and formed with an arc auxiliary positioning surface, the lower end of the arc auxiliary positioning surface is fixed with a central positioning cylindrical shaft, the alloy tool bit of the alloy tool bit is machined and formed with a front tool face chip groove and a main cutting edge, the outer side of the main cutting edge is machined and formed with a rear tool face, the edge of the rear tool face is longitudinally provided with a 2-degree axial inclined main positioning plane, the central positioning cylindrical shaft is machined and formed with a screw fastening plane, the alloy tool bit is provided with a torsion clamping groove, the lower part of the alloy tool bit is machined and formed with a bottom horizontal positioning plane, the edge of the steel tool bit is provided with a tool bar chip groove, and the upper part of the steel tool bit is provided with a matching plane used for matching with the bottom horizontal positioning plane, the utility model discloses a steel cutter arbor, including steel cutter arbor, first rear end face and second rear end face, the location notch that cooperation alloy tool bit used is seted up to cooperation planar one side, the indent clearance plane has been seted up to the upper end of steel cutter arbor, the assembly centering has been seted up at the top of steel cutter arbor, one side of assembly centering machine-shaping respectively has circular arc interference face, the top bilateral symmetry of steel cutter arbor is opened there are first rear end face and second rear end face.

As an optimal implementation manner of the utility model, the interior cooling hole has been seted up on the first rear end face, the fastening screw through-hole has still been seted up to one side of steel cutter arbor.

As a preferred embodiment of the present invention, the fastening screw through hole is provided with a side-mounted screw therein, and the side-mounted screw is in contact with the screw fastening plane.

As a preferred embodiment of the present invention, the 2-degree axial inclination main positioning plane is formed in a 2-degree inclination shape.

As a preferred embodiment of the utility model, the vice locating surface of circular arc of alloy tool bit is used through circular arc interference face and the cooperation of steel cutter arbor.

Compared with the prior art, the beneficial effects of the utility model are as follows:

1. this scheme has optimized the structure of interchangeable tool bit formula drill bit, insert the assembly centering back through central location cylindric axle and the circular indent die cavity of steel cutter arbor, through clockwise rotation, bottom horizontal orientation face contacts with the face and the face cooperation of steel cutter arbor horizontal orientation face earlier, the vice locating surface of circular arc produces the interference with the vice locating surface of steel cutter arbor circular arc when rotatory, 2 axial tilt main locating plane and 2 inclined plane of steel cutter arbor hug closely the back tool bit and stop clockwise rotation, the solid screw of side is twisted respectively into to steel cutter arbor both sides, withstand the screw fastening plane, make the tool bit install on the cutter arbor after can not anticlockwise rotation and break away from the cutter arbor, reach stable firm assembly.

2. This scheme can see and insert the assembly back through central positioning cylinder axle and the circular indent die cavity of steel cutter arbor, tool bit and cutter arbor are on same axle center, realize concentric, after the cutter arbor is packed into to tool bit clockwise rotation, tool bit horizontal orientation face reaches the cooperation with the cutter arbor horizontal orientation face with face ground, bear and support the axial force of drilling man-hour, 2 main orientation face slope main location plane and face ground assembly back, the tool bit is as long as not counter-clockwise turning, just can not drop from the cutter arbor, in addition can resist the rotatory torsion of drilling in-process, the in-process tool bit that resists drilling torsion can bear the axial force from main cutting edge to the cutter arbor always, thereby make the assembly of tool bit and cutter arbor more stable, the vice location circular arc of circular arc interference fit circular arc with can make the tool bit more stable in the drilling in-process, can not move in the horizontal direction. After the side of the screws on the two sides is fixedly propped against the screw fastening plane of the cutter head, the cutter head is prevented from rotating anticlockwise due to huge bounce after the through hole is drilled out, then the cutter head is loosened out of the cutter bar, and the operation is simple, convenient to assemble, disassemble and use.

Drawings

FIG. 1: a stereo view after the replaceable hard alloy cutter head and the steel cutter bar are assembled;

FIG. 2: a perspective view before the replaceable hard alloy cutter head and the steel cutter bar are assembled in a clockwise rotating way;

FIG. 3: a perspective view before the replaceable hard alloy cutter head and the cutter bar are assembled in a clockwise rotating manner;

FIG. 4: a front view of a replaceable hard alloy cutter head;

FIG. 5: the other visual angle of the horizontal plane of the replaceable hard alloy tool bit;

FIG. 6: a replaceable hard alloy cutter head bottom view;

FIG. 7: a 45 degree top view of the steel cutter bar;

FIG. 8: side view of the steel cutter bar.

In the figure, 1, an alloy cutter head; 2. negative clearance angle of the drill tip; 3. a circular arc auxiliary positioning surface; 4. a central positioning cylindrical shaft; 5. a rake face chip groove; 6. a main cutting edge; 7. a flank face; 8. the main positioning plane is axially inclined by 2 degrees; 9. a screw fastening plane; 10. a torsion clamping groove; 11. a bottom horizontal positioning surface; 12. a cutter bar chip groove; 13. a mating plane; 14. an inward concave clearance plane; 15. a positioning notch; 16. assembling and centering; 17. a second rear end face; 18. a circular arc interference surface; 19. a first rear end face; 20. cooling the hole in the inner cavity; 21. fastening screw through holes; 22. a steel cutter bar; 23. and screws are arranged on the side.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-8, the present invention provides a technical solution: a rotary positioning replaceable cutter bit comprises a replaceable cutter bit body, the replaceable cutter bit body comprises a steel cutter bar 22 and an alloy cutter bit 1 arranged at the end part of the steel cutter bar 22, the top of the alloy cutter bit 1 is machined and formed with a drill tip negative relief angle 2, one side of the alloy cutter bit 1 is machined and formed with an arc auxiliary positioning surface 3, the lower end of the alloy cutter bit 1 is fixed with a center positioning cylindrical shaft 4, the alloy cutter bit of the alloy cutter bit 1 is machined and formed with a rake face chip groove 5 and a main cutting edge 6, the outer side of the main cutting edge 6 is machined and formed with a rear cutter face 7, the edge of the rear cutter face 7 is longitudinally provided with a 2-degree axial inclined main positioning plane 8, the center positioning cylindrical shaft 4 is machined and formed with a screw fastening plane 9, the alloy cutter bit 1 is provided with a torsion clamping groove 10, the lower part of the alloy cutter bit body is machined and formed with a bottom horizontal positioning surface 11, the edge of the steel cutter bit 22 is provided with a cutter bit chip groove 12, and the upper part of the matching plane 13 used for matching with the bottom horizontal positioning surface 11, a positioning notch 15 matched with the alloy cutter head for use is formed in one side of the matching plane 13, an inward concave clearance plane 14 is formed in the upper end of the steel cutter rod 22, an assembly centering center 16 is formed in the top of the steel cutter rod 22, an arc interference surface 18 is formed in one side of the assembly centering center 16 in a machining mode respectively, and a first rear end face 19 and a second rear end face 17 are symmetrically formed in the two sides of the top of the steel cutter rod 22.

Further improved, as shown in fig. 7: an inner cooling hole 20 is formed on the first rear end surface 19, and a fastening screw through hole 21 is formed on one side of the steel cutter bar 22.

And (4) supplementary notes: the internal cooling holes 20 may open on the first rear end face 19 or the second rear end face 17.

Further improved, as shown in fig. 7: the fastening screw through hole 21 is provided with a side-mounted screw 23 therein, and the side-mounted screw 23 abuts against the screw fastening plane 9.

Further improved, as shown in fig. 4: the 2-degree axial inclined main positioning plane 8 is arranged in a 2-degree inclined manner.

Specifically, the arc pair positioning surface 3 of the alloy cutter head 1 is matched with a steel cutter bar 22 for use through an arc interference surface 18.

When in use: the utility model optimizes the structure of the drill bit with replaceable cutter bits, after the centering 16 is inserted and assembled through the central positioning cylindrical shaft 4 and the circular concave cavity of the steel cutter bar, through clockwise rotation, firstly, the surface-to-surface matching contact of the bottom horizontal positioning surface 11 and the horizontal positioning surface of the steel cutter bar, the arc auxiliary positioning surface 3 and the arc auxiliary positioning surface 3 of the steel cutter bar generate the arc interference surface 18, the cutter bit stops clockwise rotation after the 2-degree axial inclined main positioning plane 8 and the 2-degree inclined plane of the steel cutter bar are tightly attached, the side-mounted screws 23 are respectively screwed on both sides of the steel cutter bar, the screw fastening plane 9 is propped, the alloy cutter bit 1 can not rotate anticlockwise after being installed on the cutter bar, the stable and firm assembly is achieved, after the central positioning cylindrical shaft 4 and the circular concave cavity of the steel cutter bar are inserted and assembled, the cutter bit 1 and the cutter bar are on the same axis, realizing concentricity, after a tool bit is installed into a tool bar in a clockwise rotating way, the horizontal positioning surface of the tool bit 1 and the horizontal positioning surface of the tool bar are matched with each other in a surface-to-surface way and bear and support the axial force during drilling, after the surface-to-surface way of the main positioning plane 8 is assembled in a 2-degree axial inclination way, the tool bit can not fall off from the tool bar as long as the tool bit does not rotate anticlockwise, in addition, the rotating torque force during drilling can be resisted, the tool bit can bear the axial force from the main cutting edge 6 to the tool bar all the time in the process of resisting the drilling torque force, thereby the assembly of the tool bit and the tool bar is more stable, the tool bit can be more stable in the drilling process by the arc interference fit of the auxiliary positioning arc, the tool bit can not move in the horizontal direction, after the side of screws at two sides are fixedly propped against the tool bit screw fastening plane 9, the huge counter-elastic force after the through hole is drilled out of the head is prevented, the tool bit can rotate anticlockwise, and the tool bit can be released out of the tool bar, the operation is simple, and the disassembly, the assembly and the use are convenient.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a rotatory location interchangeable tool bit formula drill bit, includes interchangeable tool bit formula drill bit, its characterized in that: the replaceable cutter head type drill bit comprises a steel cutter bar (22) and an alloy cutter head (1) arranged at the end part of the steel cutter bar (22), wherein the top of the alloy cutter head (1) is machined and formed with a negative drill point relief angle (2), one side of the alloy cutter head (1) is machined and formed with an arc auxiliary positioning surface (3) and a center positioning cylindrical shaft (4) is fixed at the lower end of the arc auxiliary positioning surface, the alloy cutter head of the alloy cutter head (1) is machined and formed with a front cutter surface chip discharge groove (5) and a main cutting edge (6), the outer side of the main cutting edge (6) is machined and formed with a rear cutter surface (7), the edge of the rear cutter surface (7) is longitudinally provided with a 2-degree axial inclined main positioning plane (8), the center positioning cylindrical shaft (4) is machined and formed with a screw fastening plane (9), the alloy cutter head (1) is provided with a torsion clamping groove (10) and the lower part is machined and formed with a bottom horizontal positioning plane (11), cutter arbor chip groove (12) and top have been seted up at the edge of steel cutter arbor (22) and have been seted up cooperation bottom horizontal location face (11) cooperation plane (13) that use, location notch (15) that cooperation alloy tool bit used are seted up to one side of cooperation plane (13), the indent is seted up to the upper end of steel cutter arbor (22) and is kept away empty plane (14), assembly centering (16) have been seted up at the top of steel cutter arbor (22), one side machine-shaping respectively of assembly centering (16) has circular arc interference face (18), the top bilateral symmetry of steel cutter arbor (22) is opened has first rear end face (19) and second rear end face (17).

2. A rotary positioning indexable drill bit according to claim 1 wherein: an inner cooling hole (20) is formed in the first rear end face (19), and a fastening screw through hole (21) is further formed in one side of the steel cutter bar (22).

3. A rotary positioning indexable drill bit according to claim 2 wherein: a side mounting screw (23) is arranged in the fastening screw through hole (21), and the side mounting screw (23) is abutted to the screw fastening plane (9).

4. A rotary positioning indexable drill bit according to claim 1 wherein: the 2-degree axial inclined main positioning plane (8) is formed in a 2-degree inclined manner.

5. A rotary positioning indexable drill bit according to claim 1 wherein: the arc pair positioning surface (3) of the alloy cutter head (1) is matched with a steel cutter bar (22) through an arc interference surface (18).