CN211071949U - Double-sided limiting inclined-penetrating locking head-changing drill - Google Patents

Abstract

The utility model relates to a two-sided spacing oblique penetration locking drill with replaceable drill point, including the drilling rod and install the interchangeable drill point on it, the interchangeable drill point, the lower part has first spacing face and second spacing face, form the swallow tail structure of narrow top down width, the lower extreme is provided with first locating surface and second locating surface, be the V-arrangement, first locating surface and second locating surface cooperate with two bottom surfaces of drilling rod mounting structure, the position that is close entity central authorities is provided with the fastening via hole, the drilling rod, the upper end is equipped with the mounting structure who is used for installing the interchangeable drill point, the mounting structure is the semi-closed groove of using public axis C L centrosymmetry, the groove has first bottom surface and second bottom surface as the locating surface, be the V-arrangement, the entity part of groove both sides is equipped with the installation screw and the installation counter bore that links up with it, the entity part of groove both sides is provided with first spacing screw and second spacing screw.

Description

Double-sided limiting inclined-penetrating locking head-changing drill

Technical Field

The utility model relates to a two-sided spacing locking drill of trading head of wearing to one side belongs to cutting tool technical field.

Background

In the hole machining process, a hard alloy drill bit is widely adopted, but in the large-diameter drilling process, the whole hard alloy drill bit is expensive in manufacturing cost; especially in high-speed and high-efficiency drilling, the manufacturing cost of the internal-cooling type integral hard alloy drill bit is higher, and the drill bit is an inevitable technical path for low-cost processing. The prior disclosed technical scheme has the following defects:

for example, PCT/I L2005/000999 discloses a "cutting tool, cutting head and cutting tool assembly" which, when applied to a drilling tool, presents the problem of the receiving portion of the shank being too thin and the clamping force being reduced after multiple drill tip changes, thereby resulting in bit failure.

The Chinese patent with the patent application number of 201710517688.4 discloses a high-stability self-centering drill bit, wherein the drill bit is positioned by a pin and is installed on a cutter bar through rotary locking. The mounting mode is accurate in positioning, but the biggest problem is that the mounting part of the cutter bar is single-thin in structure, fatigue is easy to occur after multiple clamping, and the situation that the clamping force is reduced to further cause the failure of the drill bit with the replaceable drill point exists.

Chinese patent No. 201510252190.0 discloses a drill bit with a replaceable cutter head structure, which is positioned by a pin and fastened by a screw on a lateral side surface of the pin; there is also a problem that the mounting portion of the blade holder is structurally thin.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the not enough of prior art existence, provide a two-sided spacing to wear to lock to one side and trade the first brill.

The purpose of the utility model is realized through the following technical scheme:

the double-sided limiting obliquely-penetrating locking head-changing drill is characterized by comprising a drill rod, a replaceable drill tip and a fastening screw, wherein the replaceable drill tip is arranged on the drill rod and has a common axis C L;

the replaceable drill point is in 360-degree central symmetry with an axis C L, the lower part of the replaceable drill point is provided with a sheet structure of a first limiting surface and a second limiting surface, the first limiting surface and the second limiting surface form a dovetail structure with a narrow upper part and a wide lower part, the lower end of the replaceable drill point is provided with a first positioning surface and a second positioning surface, the first positioning surface and the second positioning surface are in a V shape, the first positioning surface and the second positioning surface which are in the V shape are matched with two bottom surfaces of a drill rod installation structure, so that the replaceable drill point and a drill rod are coaxial with a common axis C L, a fastening through hole is arranged at a position close to the center of a solid and is orthogonal to the axis C L, a first cutting edge and a second cutting edge are symmetrically distributed according to the axis C L, the first cutting edge and the second cutting edge are arranged at the 360-degree central symmetry, the first cutting edge and the second cutting edge extend from the central axis C L to the maximum diameter positions at two sides with the uppermost end of the replaceable drill point, the first cutting edge and the second cutting edge are parts of the outermost edges and are in a;

the drill rod is a combination body formed by a drill body, a protective cone and a cylindrical straight shank which are coaxial with a common axis C L, and is provided with a spiral drill rod first chip removal groove and a drill rod second chip removal groove which are symmetrical about an axis C L, the upper end of the drill rod is provided with an installation structure for installing a replaceable drill tip, the installation structure is a semi-closed groove which is symmetrical about a common axis C L, the groove is provided with a first bottom surface and a second bottom surface which are used as positioning surfaces and is arranged in a V shape, solid parts on two sides of the groove are orthogonal to the common axis and are obliquely provided with an installation screw hole and an installation counter bore connected with the installation screw hole, the solid parts on two sides of the groove are centrally and symmetrically distributed according to the axis C L at 360 degrees, and a first limit screw hole and a second limit screw hole are arranged below the installation screw hole and the installation counter bore and above the first bottom surface and.

Further, the double-sided limiting obliquely-penetrating locking bit-changing drill has an included angle of 120-140 ° between the first positioning surface and the second positioning surface.

Further, the double-sided limiting obliquely-penetrating locking head-changing drill has the advantages that the fastening through hole and the first mounting surface or the second mounting surface form an included angle of 50-70 degrees in an inclined mode.

Further, the double-sided limiting obliquely-penetrating locking head-changing drill is characterized in that the first cutting edge and the second cutting edge are linear, arc or space curve shapes suitable for cutting.

Further, the double-sided limiting obliquely-penetrating locking bit-changing drill is characterized in that the outermost edge tangents of the first edge and the second edge and the axis C L form a helical angle, and the helical angle is 15-35 degrees.

Further, the double-sided limiting obliquely-penetrating locking drill with the replaceable drill tip is characterized in that the width of the first edge and the width of the second edge are 0.05-0.1 times of the diameter of the replaceable drill tip, the distance between the first edge and the second edge in the direction of the axis C L is the length of the edge, and the length of the edge is 0.3-1.0 times of the diameter of the replaceable drill tip.

Further, the double-sided limiting obliquely-penetrating locking head-changing drill is characterized in that a drill tip first chip removal groove and a drill tip second chip removal groove are arranged adjacent to the first cutting edge and the second cutting edge and take the first edge and the second edge as edges, and the drill tip first chip removal groove and the drill tip second chip removal groove are formed in a mode that the first cutting edge and the second cutting edge extend along the first edge and the second edge in a spiral mode on the replaceable drill tip by taking the axis C L as a reference.

Further, the double-sided limiting slant-threading locking drill bit is characterized in that the first drill rod chip groove and the second drill rod chip groove have a truncated shape in a section of the vertical axis C L.

Further, the two-sided limiting obliquely-penetrating locking drill bit is characterized in that the truncated shape is formed by four line sections which are connected in sequence, the starting section and the ending section are a first straight line section and a second straight line section, and the middle section is a first circular arc section and a second circular arc section.

Further, the double-sided limiting obliquely-penetrating locking head-changing drill is characterized in that the V-shaped included angle between the first bottom surface and the second bottom surface is 120-140 degrees, and when the replaceable drill tip is installed, the replaceable drill tip can be matched with the first positioning surface and the second positioning surface of the replaceable drill tip, so that the replaceable drill tip and the drill rod are coaxial with each other on the common axis C L.

Further, the double-sided limiting obliquely-penetrating locking drill bit is characterized in that the axes of the first limiting screw hole and the second limiting screw hole are spatially perpendicular to and non-orthogonal to the common axis C L.

Compared with the prior art, the utility model have apparent advantage and beneficial effect, the concrete aspect that embodies is in following:

① the utility model has unique design and novel structure, the drill bit comprises a replaceable drill bit and a drill rod capable of installing the replaceable drill bit, the lower part of the replaceable drill bit is provided with a V-shaped positioning surface, the upper part of the drill rod is provided with an installation structure, the groove of the installation structure is provided with a V-shaped positioning bottom surface, the replaceable drill bit has the same space angle with the V-shaped positioning structure of the drill rod and can be matched, after installation, the replaceable drill bit and the drill rod have a common axis C L, and the replaceable drill bit is stably fixed on the drill rod;

② the replaceable drill point has two limiting surfaces, the two limiting surfaces form a dovetail structure with a narrow top and a wide bottom, when in installation, the first limiting screw and the second limiting screw ensure that the drill rod and the replaceable drill point are reliably positioned and do not loosen under the working state of CCW direction rotation through the abutting connection of the limiting screws;

③ fastening through holes are arranged at the position of the replaceable drill tip near the center of the solid body, the replaceable drill tip is stably fixed on the drill rod through fastening screws, and the replaceable drill tip and the drill rod are distributed in a sandwich manner and are firmly connected to form a whole;

④ the drill rod can be installed with the replaceable drill point through two limit screws and fastening screws to form a double-sided limit obliquely-penetrating locking drill for drilling, so that the replaceable drill point can be conveniently replaced without disassembling the cutter bar during use;

⑤, the cutting is stable when the drill bit works according to the CCW direction, in the implementation example, the material marks and the geometrical characteristics of different replaceable drill points can be selected according to the workpiece material, the drill bit has the characteristics of simple structure, accurate positioning, high mechanical strength and the like, is reliable to install, can obviously prolong the service life of the replaceable drill points, and has low cost and good economical efficiency.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1: the utility model discloses an assembly three-dimensional schematic diagram;

FIG. 2: a front view of the replaceable drill tip;

FIG. 3: side view of the interchangeable drill tip;

FIG. 4: a perspective view of the drill rod;

FIG. 5: the utility model has a partial view assembled on the front side of the replaceable drill point and the drill rod;

FIG. 6: the utility model has a side assembly partial view of the replaceable drill point and the drill rod;

FIG. 7: FIG. 5 is an X-X sectional view (cross-sectional view);

FIG. 8: a schematic view of an alternative example cooling channel for a drill rod;

FIG. 9: schematic representation of an alternative example of a drill rod is a cylindrical shank.

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. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiment of the present invention, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present invention, the directional terms and the sequence terms and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.

As shown in fig. 1, the double-sided limiting angle-penetration locking head-changing drill comprises a drill rod 100, an interchangeable drill tip 200 and a fastening screw 300, wherein the interchangeable drill tip 200 is arranged on the drill rod 100 and has a common axis C L.

As shown in fig. 2 to 3, the replaceable drill tip 200 is centrosymmetric in 360 degrees around an axis C L, the lower part of the replaceable drill tip has a sheet structure with a first limiting surface 204A and a second limiting surface 204B, the first limiting surface 204A and the second limiting surface 204B form a dovetail structure with a narrow top and a wide bottom, and the front side and the rear side of the sheet structure are provided with a first mounting surface 207A or a second mounting surface 207B which are parallel;

the lower end of the drill rod is provided with a first positioning surface 205A and a second positioning surface 205B, the first positioning surface 205A and the second positioning surface 205B are V-shaped, the included angle between the first positioning surface 205A and the second positioning surface 205B is 120-140 degrees, and the V-shaped first positioning surface 205A and the V-shaped second positioning surface 205B are matched with the two bottom surfaces of the drill rod installation structure, so that the replaceable drill tip 200 and the drill rod are coaxial with each other by a common axis C L.

The replaceable drill point 200 is stably fixed on the drill rod 100 through the fastening screw 300, the replaceable drill points 200 and the drill rod 100 are distributed in a sandwich mode, and are firmly connected to form a whole.

The replaceable drill point comprises a first cutting edge 202A and a second cutting edge 202B which are distributed according to an axis C L in a 360-degree central symmetry manner and play a role in cutting in work, wherein the first cutting edge 202A and the second cutting edge 202B extend from the central axis C L to the maximum diameter positions on two sides of the uppermost end of the replaceable drill point 200, and the first cutting edge 202A and the second cutting edge 202B are in a straight line shape, an arc shape or a space curve shape which is suitable for the cutting role;

the left side and the right side of the replaceable drill point are provided with a first edge 201A and a second edge 201B, the first edge 201A and the second edge 201B are parts of an imaginary cylinder of the outermost edge of the first cutting edge 202A and the second cutting edge 202B, the first edge 201A and the second edge 201B have width and are spiral, the tangent line of the outermost edge of the first edge 201A and the second edge 201B and an axis C L form a spiral angle 220, the spiral angle 220 ranges from 15 degrees to 35 degrees, the width of the first edge 201A and the width of the second edge 201B are 0.05-0.1 times of the diameter of the replaceable drill point 200, the distance between the first edge 201A and the second edge 201B in the direction of the axis C L is the edge length, and the edge length is 0.3-1.0 times of the diameter of the replaceable drill.

Adjacent to the first cutting edge 202A and the second cutting edge 202B, on the basis of the first edge 201A and the second edge 201B, a first chip flute 203A and a second chip flute are provided, which are both drill points and which are the first chip flute 203A and the second chip flute 202B, which extend in a spiral manner on the exchangeable drill point 200 and along the first edge 201A and the second edge 201B, in a natural manner, with reference to the axis C L.

The replaceable drill tip 200 is limited by a first limiting screw 400A and a second limiting screw 400B, the first limiting screw 400A and the second limiting screw 400B are screwed into a first limiting screw hole 104A and a second limiting screw hole 104B of the drill rod 100, abut against the first limiting surface 204A and the second limiting surface 204B, and the replaceable drill tip 200 is stably fixed on the drill rod 100 by the fastening screw 300.

The lower part of the interchangeable drill tip 200 is provided with a V-shaped positioning structure, namely a first positioning surface 205A and a second positioning surface 205B, the first positioning surface 205A and the second positioning surface 205B are at the same spatial angle with the first bottom surface 110A and the second bottom surface 110B of the installation structure 102 of the drill rod 100 and can be matched with each other, after installation, the interchangeable drill tip 200 and the drill rod 100 share a common axis C L, and the interchangeable drill tip 200 and the drill rod 100 are ensured to rotate in the CCW direction by the common axis C L as a whole during operation.

As shown in fig. 4 to 7, the drill rod 100 is a coaxial combination of a drill body 109, a protection cone 107 and a cylindrical straight shank 106 by a common axis C L;

the drill rod first chip groove 101A and the drill rod second chip groove 101B are provided with a spiral drill rod first chip groove 101A and a spiral drill rod second chip groove 101B which take an axis C L as a symmetric center and are used for discharging chips formed by drilling, the drill rod first chip groove 101A and the drill rod second chip groove 101B are provided with a designed section on a T-T section vertical to the axis C L, the section is formed by sequentially connecting four line sections, the starting section and the ending section are a first straight line section Z1 and a second straight line section Z2, the middle section is a first circular arc line section R1 and a second circular arc line section R2, different circular arc radiuses and different splicing angles can be selected according to different sizes of the drill rod 100, the drill rod first chip groove 101A and the drill rod second chip groove 101B can be regarded as a drill tip first chip groove 203A and a drill tip second chip groove of the mounted replaceable drill tip 200, extend on the drill rod 100 along the axis C L, and the length can be adjusted according to the;

the upper end of the replaceable drill point 200 is provided with a mounting structure 102 for mounting the replaceable drill point 200, the mounting structure 102 is a semi-closed groove 115 which is centrosymmetric about a common axis C L, the groove 115 is provided with a first bottom surface 110A and a second bottom surface 110B and is arranged in a V shape, the V-shaped included angle between the first bottom surface 110A and the second bottom surface 110B is 120-140 degrees, the first bottom surface 110A and the second bottom surface 110B are positioning surfaces, and when the replaceable drill point 200 is mounted, the replaceable drill point 200 can be matched with the V-shaped first positioning surface 205A and the second positioning surface 205B of the replaceable drill point 200, so that the replaceable drill point 200 and the drill rod 100 are coaxial about the common axis C L;

the solid parts at two sides of the groove 115 are orthogonal to the common axis and are obliquely provided with an installation screw hole 103B and an installation counter bore 103A connected with the installation screw hole 103B, when in installation, the installation screw hole 103B is matched with the thread part of the fastening screw 300, and the installation counter bore 103A is used for placing the counter head part of the fastening screw 300; after the fastening screw 300 is locked, the drill rod 100 and the replaceable drill tip 200 are distributed in a sandwich mode and are firmly integrated;

the solid parts on two sides of the groove 115 are distributed in a 360-degree central symmetry mode according to an axis C L, a first limiting screw hole 104A and a second limiting screw hole 104B are arranged below the mounting screw hole 103B and the mounting counter bore 103A and above the first bottom surface 110A and the second bottom surface 110B, and the respective axes of the first limiting screw hole 104A and the second limiting screw hole 104B are perpendicular to the common axis C L in space but not orthogonal.

The replaceable drill tip drill rod 100 is used for installing the replaceable drill tip 200, during installation, the first limiting screw 400A and the second limiting screw 400B are screwed into the first limiting screw hole 104A and the second limiting screw hole 104B respectively, abut against the first limiting surface 204A and the second limiting surface 204B, the replaceable drill tip 200 is stably fixed on the drill rod 100 through the fastening screw 300, the possibility that the replaceable drill tip 200 moves upwards is restrained, and the replaceable drill tip 200 is prevented from loosening from the drill rod 100. The two-sided limiting obliquely-penetrating locking head-changing drill 01 is combined and used for executing drilling processing. The replaceable drill tip 200 can be conveniently replaced without disassembling the cutter bar 100 in use. The first limiting screw 400A and the second limiting screw 400B ensure that the drill rod 100 and the replaceable drill point 200 are reliably positioned in the working state of rotating in the CCW direction and are not loosened. After the tightening screw 300 is tightened, the drill rod 100 and the replaceable drill tip 200 are distributed in a "sandwich" manner.

As shown in FIG. 8, the replaceable drill tip 200 is provided with at least a first cooling channel 120A and a second cooling channel 120B, which are symmetrically distributed in the center of 360 degrees along an axis C L, the first cooling channel 120A and the second cooling channel 120B are communicated with the main cooling channel 105, when the replaceable drill tip is machined, the replaceable drill tip 200 is provided with cooling liquid, the space arrangement of the first cooling channel 120A and the second cooling channel 120B is fully considered, the replaceable drill tip cannot be interfered with the first limit screw hole 104A or the second limit screw hole 104B, and the leakage problem of the cooling liquid exists, and therefore, the first limit screw hole 104A or the second limit screw hole 104B can be eccentrically configured.

As shown in fig. 9, a cylindrical straight shank 106 at the lower end of the drill rod 100 is provided with an internal thread 107 for connecting an oil path for supplying a cooling fluid to the bit-changing drill 01 during drilling; the cylindrical straight shank 106 is provided with a side pressing surface 108, so that the bit-changing drill 01 can be conveniently installed on a lathe.

To sum up, the utility model relates to a uniquely, novel structure, the drill rod of interchangeable drill point and mountable interchangeable drill point is bored including removable interchangeable, and the lower part of interchangeable drill point has the V-arrangement locating surface, and the upper portion of drill rod is provided with mounting structure, and mounting structure's groove has V-arrangement location bottom surface, and the V-arrangement locating structure space angle of interchangeable drill point and drill rod is the same and can cooperate, and after the installation, interchangeable drill point and drill rod possess common share axis C L, and the interchangeable drill point is fixed on the drill rod steadily.

The interchangeable drill point has two spacing faces, and two spacing faces form under the narrow wide forked tail structure, during the installation, through stop screw and its butt, first stop screw and second stop screw guarantee that drilling rod and interchangeable drill point fix a position reliably under the rotatory operating condition of CCW direction, do not take place the pine and take off.

The position that is close entity central authorities of interchangeable point of drill is provided with the fastening via hole, fixes the interchangeable point of drill on the drilling rod through fastening screw steadily, and the interchangeable point of drill is "sandwich" distribution with the drilling rod, and firm in connection just becomes a whole.

The drill rod, two stop screws of accessible and fastening screw are in the same place the installation of drilling rod and interchangeable drill point, make up into two-sided spacing to wear to lock to trade the head and bore for carry out drilling processing, realize under the condition that in use does not dismantle the cutter arbor, conveniently change interchangeable drill point.

The cutting is carried out according to the CCW rotating direction during working, and the cutting is stable; in the implementation example, different material marks and geometric characteristics of the replaceable drill point can be selected according to the material of the workpiece; the replaceable drill point has the characteristics of simple structure, accurate positioning, high mechanical strength and the like, is reliable to install, can obviously prolong the service life of the replaceable drill point, and is low in cost and good in economical efficiency.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. 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. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

Claims (10)

1. The double-sided limiting obliquely-penetrating locking head-changing drill is characterized by comprising a drill rod (100), a replaceable drill tip (200) and a fastening screw (300), wherein the replaceable drill tip (200) is arranged on the drill rod (100) and has a common axis C L;

the replaceable drill point (200) is in 360-degree central symmetry with an axis C L, the lower portion of the replaceable drill point is provided with a sheet structure of a first limiting surface (204A) and a second limiting surface (204B), the first limiting surface (204A) and the second limiting surface (204B) form a dovetail structure with a narrow upper portion and a wide lower portion, the lower end of the replaceable drill point is provided with a first positioning surface (205A) and a second positioning surface (205B), the first positioning surface (205A) and the second positioning surface (205B) are in a V shape, the V-shaped first positioning surface (205A) and the V-shaped second positioning surface (205B) are matched with two bottom surfaces of a drill rod mounting structure, the replaceable drill point (200) and a drill rod are coaxial with a common axis C L, a fastening through hole (206) is arranged at a position close to the center of a solid, the fastening through hole (206) is orthogonal to the axis C L, the replaceable drill point and the replaceable drill point is symmetrically distributed according to the axis C L with the axis C L, the replaceable drill point is provided with a first cutting edge (202A) and a second cutting edge (202B), the replaceable drill point (202A) and the replaceable drill point (202B) are in a spiral shape, the first cutting edge (202A), the outermost cutting edge 201A) and the second cutting edge (201B), the replaceable drill point (202A) and the replaceable drill point (202B) extend towards the outermost side 201A), the outermost diameter of the;

the drill rod (100) is a coaxial combination of a drill body (109), a cone protector (107) and a cylindrical straight shank (106) by a common axis C L;

a spiral drill rod first chip groove (101A) and a spiral drill rod second chip groove (101B) which take an axis C L as a symmetrical center are arranged;

the upper end of the box body is provided with a mounting structure (102), the mounting structure (102) is a semi-closed groove (115) which is centrosymmetric about a common axis C L, and the groove (115) is provided with a first bottom surface (110A) and a second bottom surface (110B) which are used as positioning surfaces and arranged in a V shape;

the solid parts at two sides of the groove (115) are provided with mounting screw holes (103B) and mounting counter bores (103A) connected with the mounting screw holes, wherein the mounting screw holes are orthogonal to the common axis and are obliquely crossed with the groove (115);

solid parts on two sides of the groove (115) are distributed in 360-degree central symmetry according to an axis C L, and a first limiting screw hole (104A) and a second limiting screw hole (104B) are arranged below the mounting screw hole (103B) and the mounting counter bore (103A) and above the first bottom surface (110A) and the second bottom surface (110B).

2. The double-sided limiting obliquely-penetrating locking bit-changing drill according to claim 1, characterized in that: the included angle between the first positioning surface (205A) and the second positioning surface (205B) is 120-140 degrees.

3. The double-sided limiting obliquely-penetrating locking bit-changing drill according to claim 1, characterized in that: the fastening through hole (206) and the first mounting surface (207A) or the second mounting surface (207B) form an included angle of 50-70 degrees.

4. The double-sided limiting obliquely-penetrating locking bit-changing drill according to claim 1, characterized in that: the first cutting edge (202A) and the second cutting edge (202B) are linear, circular, or spatially curvilinear in shape to accommodate the cutting action.

5. The double-sided limiting angle-penetration locking bit-changing drill as claimed in claim 1, wherein the outermost edge tangents of the first edge (201A) and the second edge (201B) form a helix angle (220) with an axis C L, and the helix angle (220) is 15-35 °.

6. A double-sided limiting inclined-penetration locking bit-changing drill according to claim 1 or 5, characterized in that the width of the first edge (201A) and the second edge (201B) is 0.05-0.1 times the diameter of the replaceable drill tip (200), the distance between the first edge (201A) and the second edge (201B) in the direction of the axis C L is the edge length, and the edge length is 0.3-1.0 times the diameter of the replaceable drill tip (200).

7. The double-sided limiting miter locking head drill of claim 1, wherein a first chip removal flute (203A) and a second chip removal flute are provided adjacent to the first cutting edge (202A) and the second cutting edge (202B) and bordered by the first edge (201A) and the second edge (201B), the first chip removal flute (203A) and the second chip removal flute are natural extensions of the first cutting edge (202A) and the second cutting edge (202B) on the replaceable drill tip (200) in a spiral manner and along the first edge (201A) and the second edge (201B) with respect to the axis C L.

8. The double-sided limiting angle-penetration locking head-changing drill according to claim 1, wherein the section of the first drill rod chip removal groove (101A) and the second drill rod chip removal groove (101B) perpendicular to the axis C L is a truncated shape formed by sequentially connecting four line segments, the starting segment and the ending segment are a first straight line segment (Z1) and a second straight line segment (Z2), and the middle segment is a first arc line segment (R1) and a second arc line segment (R2).

9. The double-sided limiting obliquely-penetrating locking head-changing drill according to claim 1, wherein a V-shaped included angle between the first bottom surface (110A) and the second bottom surface (110B) is 120-140 degrees, and when the replaceable drill tip (200) is installed, the replaceable drill tip can be matched with the first positioning surface (205A) and the second positioning surface (205B) of the replaceable drill tip (200), so that the replaceable drill tip (200) and the drill rod (100) are coaxial with each other through a common axis C L.

10. The double-sided limiting angle-penetration locking bit-changing drill according to claim 1, wherein the respective axes of the first limiting screw hole (104A) and the second limiting screw hole (104B) are spatially perpendicular and non-orthogonal to the common axis C L.

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