Single-hole limited position replaceable drill tip

Abstract

The present application relates to a single-hole limiting replaceable drill tip, the lower part of the replaceable drill tip has a V-shaped positioning surface with the same spatial angle as the V-shaped positioning structure of the drill rod and can cooperate with the V-shaped positioning structure, the replaceable drill tip and the drill rod have a common common axis CL, which ensures that the replaceable drill tip and the drill rod are coaxial with the common axis CL; the replaceable drill tip has a limiting hole, which is in abutment with a limiting screw, which ensures that the drill rod and the replaceable drill tip inhibit the possibility of upward movement of the replaceable drill tip in the working state of rotation in the CCW direction, do not loosen, and the positioning is accurate and reliable; the position close to the central part of the replaceable drill tip is provided with a fastening via, and the replaceable drill tip is stably fixed on the drill rod through a fastening screw; the replaceable drill tip and the drill rod are in a sandwich distribution, the connection is firm and becomes an integral whole. The present application has the characteristics of simple structure, accurate positioning, high mechanical strength, reliable installation, and significantly improves the service life of the replaceable drill tip.

Description

TECHNICAL FIELD

[0001] The present application relates to a single-hole limiting replaceable drill tip, belonging to the technical field of cutting tools. BACKGROUND

[0002] At present, in the hole processing technology, cemented carbide drill bits have been widely used, but in the large-diameter drilling process, the overall cemented carbide drill bit is expensive; especially in high-speed and efficient drilling process, the cost of the inner-cooled overall cemented carbide drill bit is higher, and the head drill becomes the inevitable technical path of low-cost processing. The existing disclosed technical solutions have the following disadvantages, for example:

[0003] The Chinese patent with patent number CN202010877085.7 discloses a "symmetrical inclined surface positioning replaceable drill", which is applied to a drilling tool, adopts a three-screw way to limit and lock, has the problems of complex installation action and low adjustment efficiency, and has the problems of difficult disassembly caused by the difference between the screw expansion coefficient and the cutter expansion coefficient during the trial process.

[0004] The Chinese patent with patent application number CN201911099227.5 discloses a "double-face limiting inclined penetration locking head drill", which also adopts a three-screw way to limit and lock, has the problems of complex installation action and low adjustment efficiency.

[0005] The Chinese patent with patent number 201710517688.4 discloses a "high-stability self-centering drill bit drill tip", which adopts a pin positioning, and is installed on a cutter bar through rotation locking. This installation method is relatively accurate in positioning, but the biggest problem is that the installation part of the cutter bar is thin in structure, and is easy to fatigue after multiple clamping, and has the problem of reduced clamping force and further leading to the failure of the replaceable drill tip drill.

[0006] The Chinese patent with patent number 201510252190.0 discloses a "drill bit with replaceable head structure", which adopts pin positioning and is fastened through a pin side pressure surface screw; and also has the problem of thin structure of the installation part of the cutter bar. SUMMARY

[0007] The purpose of the present application is to overcome the deficiencies of the prior art, and to provide a single-hole limiting replaceable drill tip.

[0008] The purpose of the present application is achieved by the following technical solutions:

[0009] The single-hole limiting replaceable drill tip has the features that it is a sheet structure which is 360° center-symmetric with a common axis, and the sheet structure is provided with parallel first and second installation surfaces on the front and back sides thereof; the lower end is provided with a first positioning surface and a second positioning surface which are V-shaped; a fastening through hole is arranged at a position close to the center of the entity, and the fastening through hole is orthogonal to the common axis; and a limiting hole is arranged below the fastening through hole, and the limiting hole is parallel to the fastening through hole.

[0010] The replaceable drill tip is 360° center-symmetrically distributed with a common axis, and is provided with first and second cutting edges which extend from the uppermost end of the replaceable drill tip to the positions of the maximum diameter on both sides of the common axis.

[0011] The left and right sides are provided with first and second edges which are part of the outermost imaginary cylinder of the first and second cutting edges, and the diameter of the imaginary cylinder is the same as the diameter of the replaceable drill tip; the first and second edges have a width and are helical, and the tangent line of the outermost edge of the first and second edges forms a helix angle with the common axis.

[0012] The first and second edges are adjacent to the first and second cutting edges, and the first and second edges are edges of the first and second edges, and are provided with first and second chip flutes; the first and second chip flutes are helical on the replaceable drill tip with the common axis as the reference of the first and second cutting edges and along the natural extension of the first and second edges.

[0013] Further, the single-hole limiting replaceable drill tip has the features that the included angle of the first and second positioning surfaces is 120°-140°.

[0014] Further, the single-hole limiting replaceable drill tip has the features that the fastening through hole forms an included angle of 50°-70° with the first installation surface or the second installation surface.

[0015] Further, the single-hole limiting replaceable drill tip has the features that the limiting hole forms an included angle of 50°-70° with the first installation surface or the second installation surface.

[0016] Further, the single-hole limiting replaceable drill tip has the features that the helix angle is 15°-35°.

[0017] Further, the single-hole limiting replaceable drill tip has the features that the width of the first and second edges is 0.05-0.1 times the diameter of the replaceable drill tip, and the distance of the first and second edges in the direction of the common axis is the edge length, and the edge length is 0.3-1.0 times the diameter of the replaceable drill tip.

[0018] Further, the single-hole limiting replaceable drill tip has the features that the first and second cutting edges are in the shapes of straight lines, circular arcs or spatial curves which are suitable for cutting.

[0019] The present application has significant advantages and beneficial effects compared with the prior art, which are embodied in the following aspects:

[0020] ①The present application has simple structure, accurate positioning, reliable fastening, and the lower part of the replaceable drill tip has a V-shaped positioning surface with the same spatial angle as the V-shaped positioning structure of the drill rod and can cooperate with it. After installation, the replaceable drill tip and the drill rod have a common axis CL, ensuring that the replaceable drill tip and the drill rod are coaxial with the common axis CL.

[0021] ②The replaceable drill tip has a limiting hole, which is in abutment with the limiting screw during installation, ensuring that the drill rod and the replaceable drill tip are in a working state of rotation in the CCW direction and inhibiting the upward movement of the replaceable drill tip, preventing loosening, accurate positioning, and reliable fastening.

[0022] ③The position close to the center of the replaceable drill tip is provided with a fastening via, and the replaceable drill tip is stably fixed on the drill rod by a fastening screw. The replaceable drill tip and the drill rod are in a sandwich distribution, firmly connected and integrated as a whole.

[0023] ④During work, the rotation direction is CCW, and the cutting is stable. The material grade and geometric characteristics of the replaceable drill tip can be selected according to the workpiece material. The present application has the characteristics of simple structure, accurate positioning, high mechanical strength, reliable installation, significantly improved service life of the replaceable drill tip, low cost, and good economy.

[0024] Other features and advantages of the present application will be described in the following specification, and some will become apparent from the specification, or be understood by those skilled in the art from the specification, or be understood by practicing the embodiments of the present application. The purposes and other advantages of the present application can be achieved and obtained by the structures specifically pointed out in the written specification and the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be considered as limiting the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0026] Figure 1 : Assembly schematic diagram of the replaceable drill tip of the present application;

[0027] Figure 2 : Front view schematic diagram of the replaceable drill tip;

[0028] Figure 3 : Side view schematic diagram of the replaceable drill tip;

[0029] Figure 4 : X-X cross-sectional view schematic diagram of the replaceable drill tip;

[0030] Figure 5 : top view of replaceable drill tip;

[0031] Figure 6 : partial side assembly view of replaceable drill tip;

[0032] Figure 7 : assembly partial Y-Y cross-sectional view of the present application. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. The components of the embodiments of the present application described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0034] It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it need not be further defined and explained in subsequent drawings. Meanwhile, in the description of the present application, orientation terms and order terms, etc. are only used for distinguishing description, and cannot be understood as indicating or implying relative importance.

[0035] As shown in Figure 1 , the single-hole position-limiting replaceable drill tip 200 is a sheet-shaped structure with 360° central symmetry about the axis CL, and is used to be installed on the drill rod 100 to become an important component of the head-changeable drill 01;

[0036] As shown in Figures 2 to 5 , the replaceable drill tip 200 is a sheet-shaped structure with 360° central symmetry about the axis CL, and the front and rear sides of the sheet-shaped structure are provided with the parallel first mounting surface 207A and the second mounting surface 207B; the lower end is provided with the first positioning surface 205A and the second positioning surface 205B, the first positioning surface 205A and the second positioning surface 205B are V-shaped, and the included angle of the first positioning surface 205A and the second positioning surface 205B is 120°-140°;

[0037] As shown in Figure 2 , Figure 4 , the position close to the central entity is provided with the fastening through hole 206, the fastening through hole 206 is orthogonal to the common axis CL; the fastening through hole 206 and the first mounting surface 207A or the second mounting surface 207B form an inclined angle of 50°-70°;

[0038] As Figure 2 , Figure 6 , the lower part of the fastening via hole 206 is provided with a limiting hole 204, which is parallel to the fastening via hole 206, and forms an angle of 50°-70° with the first mounting surface 207A or the second mounting surface 207B; when the replaceable drill tip 200 is installed, the limiting screw 400 is tightened to make the first positioning surface 205A and the second positioning surface 205B cooperate with the two bottom surfaces of the drill rod 100 installation structure, and the replaceable drill tip 200 is coaxial with the drill rod 100 along the common axis CL;

[0039] As Figure 2 , Figure 5 , the common axis CL is centrally symmetrically distributed by 360°, and is provided with the first cutting edge 202A and the second cutting edge 202B, which play a cutting role in work, and extend from the uppermost end of the replaceable drill tip 200 to the maximum diameter on both sides of the common axis CL, and the first cutting edge 202A and the second cutting edge 202B are in the shape of a straight line, a circular arc or a spatial curve suitable for cutting action;

[0040] As Figure 3 , Figure 5 , the left and right sides are provided with the first edge 201A and the second edge 201B, which are part of the imaginary cylinder with the outermost edge of the first cutting edge 202A and the second cutting edge 202B, and the diameter of the imaginary cylinder is the same as the diameter of the replaceable drill tip; the first edge 201A and the second edge 201B have a width and are in the shape of a spiral, and the tangent line of the outermost edge of the first edge 201A and the second edge 201B forms a spiral angle 220 with the common axis CL, and the spiral angle 220 is 15°-35°, 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, and the distance of the first edge 201A and the second edge 201B in the direction of the common axis CL is the edge length, which is 0.3-1.0 times the diameter of the replaceable drill tip 200;

[0041] Adjacent to the first cutting edge 202A and the second cutting edge 202B, and with the first edge 201A and the second edge 201B as the edges, the first chip flute 203A and the second chip flute 203B are provided; the first chip flute 203A and the second chip flute 203B are the natural extension of the first cutting edge 202A and the second cutting edge 202B on the replaceable drill tip 200 in the spiral manner along the first edge 201A and the second edge 201B with the common axis CL as the reference;

[0042] As Figure 1 , Figure 6 , Figure 7 shown, the single-hole limiting replaceable drill tip 200 is installed on the drill rod 100;

[0043] The limiting screw 400 is screwed into the limiting screw hole 104 of the drill rod 100 until it is in abutting contact with the limiting hole 204 of the replaceable drill tip 200; the first positioning surface 205A and the second positioning surface 205B of the replaceable drill tip 200 cooperate with the first bottom surface 110A and the second bottom surface 110B of the drill rod 100 mounting structure, so that the replaceable drill tip 200 is coaxial with the drill rod 100 with a common axis CL, and the drill rod 100 and the replaceable drill tip 200 are reliably positioned in the working state of rotating in the CCW direction, the upward movement of the replaceable drill tip 200 is inhibited, and the replaceable drill tip 200 is prevented from being loosened from the drill rod 100;

[0044] After the fastening screw 300 is tightened, the mounting screw hole 103B cooperates with the threaded part of the fastening screw 300, the mounting counterbore 103A is used to place the countersunk part of the fastening screw 300, and the drill rod 100 and the replaceable drill tip 200 are distributed in a sandwich manner and firmly become an integral whole.

[0045] The drill rod 100 and the replaceable drill tip 200 are distributed in a sandwich manner and combined into a single-hole limiting oblique through locking head-changing drill 01 for performing drilling processing; the replaceable drill tip 200 can be conveniently replaced without disassembling the drill rod 100 in use.

[0046] As described above, the structure of the present application is simple, accurate in positioning, reliable in fastening, the lower part of the replaceable drill tip has a V-shaped positioning surface which has the same spatial angle as the V-shaped positioning structure of the drill rod and can cooperate with it, after installation, the replaceable drill tip and the drill rod have a common axis CL, and the coaxiality of the replaceable drill tip and the drill rod with the common axis CL is ensured;

[0047] The position close to the central entity of the replaceable drill tip is provided with a fastening via hole, the replaceable drill tip is stably fixed on the drill rod by the fastening screw, the replaceable drill tip and the drill rod are distributed in a sandwich manner, and are firmly connected and become an integral whole;

[0048] The replaceable drill tip has a limiting hole, when installed, the limiting screw is in abutting contact with the limiting hole, so that the drill rod and the replaceable drill tip are inhibited from moving upward in the working state of rotating in the CCW direction, loosening does not occur, accurate and reliable positioning is achieved;

[0049] During work, the CCW rotation direction is adopted, cutting is stable, the material grade and geometric characteristics of different replaceable drill tips can be selected according to the workpiece material; the present application has the advantages of low processing cost and good economy.

[0050] The above merely provides the preferred embodiments of the present application, but does not limit the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application. It should be noted that similar reference numerals and letters represent similar items in the following drawings, thus, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0051] The above merely provides the preferred embodiments of the present application, but does not limit the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application. It should be noted that similar reference numerals and letters represent similar items in the following drawings, thus, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0052] It should be noted that the relational terms herein such as first and second and the like are used solely to distinguish one from another entity or action, without necessarily requiring or implying any actual relationship or order between such entities or actions. Moreover, 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 can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

Claims

1. A single-hole limiting replaceable drill tip, characterized in that: It is a sheet-like structure with 360° central symmetry along a common axis (CL). The front and rear sides of the sheet-like structure are provided with a first mounting surface (207A) and a second mounting surface (207B) that are parallel to each other. The lower end is provided with a first positioning surface (205A) and a second positioning surface (205B), which are V-shaped. A fastening through hole (206) is provided near the center of the solid, and the fastening through hole (206) is orthogonal to the common axis (CL). Below the fastening through hole (206) is a limiting hole (204), which is parallel to the fastening through hole (206). The first cutting edge (202A) and the second cutting edge (202B) are provided with a 360° central symmetrical distribution around the common axis (CL). The first cutting edge (202A) and the second cutting edge (202B) extend from the common axis (CL) to the maximum diameter on both sides from the uppermost end of the replaceable drill tip (200). The left and right sides are provided with a first edge (201A) and a second edge (201B). The first edge (201A) and the second edge (201B) are part of the outermost imaginary cylinder of the first cutting edge (202A) and the second cutting edge (202B). The diameter of the imaginary cylinder is the same as the diameter of the replaceable drill tip. The first edge (201A) and the second edge (201B) have width and are helical. The outermost tangent of the first edge (201A) and the second edge (201B) forms a helix angle (220) with the common axis (CL). Adjacent to the first cutting edge (202A) and the second cutting edge (202B), with the first edge (201A) and the second edge (201B) as the edges, there are a first chip removal groove (203A) and a second chip removal groove (203B); the first chip removal groove (203A) and the second chip removal groove (203B) are the natural extensions of the first cutting edge (202A) and the second cutting edge (202B) on the replaceable drill tip (200) in a spiral manner with the common axis (CL) as the reference and along the first edge (201A) and the second edge (201B).

2. The single-hole limiting replaceable drill tip according to claim 1, characterized in that: The included angle between the first positioning surface (205A) and the second positioning surface (205B) is 120° to 140°.

3. The single-hole limiting replaceable drill tip according to claim 1, characterized in that: The fastening through hole (206) is inclined at an angle of 50° to 70° to the first mounting surface (207A) or the second mounting surface (207B).

4. The single-hole limiting replaceable drill tip according to claim 1, characterized in that: The limiting hole (204) is inclined at an angle of 50° to 70° with the first mounting surface (207A) or the second mounting surface (207B).

5. The single-hole limiting replaceable drill tip according to claim 1, characterized in that: The helix angle (220) is 15° to 35°.

6. The single-hole limiting replaceable drill tip according to claim 1, characterized in that: The width of the first edge (201A) and the second edge (201B) is 0.05 to 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 common axis (CL) is the edge length, and the edge length is 0.3 to 1.0 times the diameter of the replaceable drill tip (200).

7. The single-hole limiting replaceable drill tip according to claim 1, characterized in that: The first cutting edge (202A) and the second cutting edge (202B) are straight lines, arcs, or spatial curves adapted to the cutting action.

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