Three-edge integral hard alloy drill bit with drill tip provided with chip breaker groove
By designing the cutting edge and R-type chip breaker structure of the three-flute solid carbide drill bit, the problems of displacement and chip removal difficulties of traditional drill bits in deep holes or complex working conditions are solved, and efficient and stable drilling is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-10
- Publication Date
- 2026-03-20
AI Technical Summary
Traditional two-flute drill bits are prone to deviation when machining deep holes or in complex working conditions. They have high cutting pressure, poor chip removal, and easy clogging of chips, which leads to decreased drilling accuracy and shortened service life.
A three-flute solid carbide drill bit with chip breaker grooves is designed. It adopts three cutting edges and an R-type chip breaker groove structure, combined with a fine-grained Al2O3 coating and a nano-columnar MT-TiCN coating to ensure stable support and effective chip removal.
It improves drilling accuracy and stability, reduces chip clogging, extends tool life, and increases machining efficiency.
Smart Images
Figure CN224011295U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of drill bit, specifically, relate to a three -pronged whole hard alloy drill bit of drill tip with chip breaker groove. BACKGROUND
[0002] In the traditional drilling processing, two-pronged drill bit is one of the most commonly used tools. However, this kind of drill bit has obvious technical defects: first, the centering performance is insufficient, and when processing deep hole or complex working condition (such as cross hole, inclined surface entrance and exit), it is easy to deviate, resulting in the decline of drilling precision; second, the cutting pressure is larger in the cutting process, the chip removal resistance is high, and the iron filings are easy to block the chip removal groove, which not only affects the processing efficiency, but also causes the tool overheating due to the retention of iron filings, aggravates the blade wear, and shortens the service life; third, the chip breaking capacity of the traditional two-pronged drill bit is limited, and wide iron filings are easy to be generated during processing, especially when processing high toughness materials, the iron filings are difficult to curl and break, further aggravating the problem of poor chip removal.
[0003] In summary, a three-pronged whole hard alloy drill bit with drill tip and chip breaker groove is provided to solve the above problems. CONTENT OF THE UTILITY MODEL
[0004] The utility model provides a three-pronged whole hard alloy drill bit with drill tip and chip breaker groove, solves the problem of limited chip breaking capacity of the drill bit and iron filings blocking the chip removal groove.
[0005] The technical scheme of the utility model is as follows: including drill body, its characterized in that: the drill body is circumferentially arrayed and is uniformly distributed with three cutting edges, the chip removal groove is formed between the adjacent cutting edges, the R type chip breaker groove is arranged at the upper edge of the three cutting edges, the width of the R type chip breaker groove is 5% of the diameter of the drill body, the depth of the R type chip breaker groove is 3% of the diameter of the drill body, and the diameters of the three R type chip breaker grooves are different, and the front end of the drill body is provided with a drill tip structure.
[0006] As a preferred technical scheme of the utility model, the three cutting edges are distributed in 120 ° circumferential array around the center axis of the drill body.
[0007] As a preferred technical scheme of the utility model, the angle of the drill tip structure is 136 °.
[0008] As a preferred technical scheme of the utility model, the spiral angle of the chip removal groove is 28 °-32 °, and the relief angle of the cutting edge is 8 °-12 °.
[0009] As a preferred technical scheme of the utility model, the curvature radius of the R type chip breaker groove is 0.1-0.3mm, and the groove bottom of the R type chip breaker groove is a circular arc surface.
[0010] As a preferred technical scheme of the utility model, the cutting edge is provided with a coating, and the coating adopts fine-grained Al2O3 coating and nano columnar structure MT-TiCN.
[0011] The utility model discloses a working principle and beneficial effect are:
[0012] The drill bit is not easy to deviate under complex working conditions such as cross hole and inclined plane, and the drilling precision is improved, the cutting edge of each cutting edge is provided with R type chip breaker groove and divides single iron chip into two, three cutting edges change three iron chips into six narrow iron chips, the iron chip width is reduced, the curling radius is smaller, can smoothly pass through the chip removal groove and is discharged, avoids the jam and tool wear, guarantees the stability and service life of drilling, cooperates special coating, suitable spiral angle and relief angle, solves the problem of big cutting force of tool and difficult chip removal. BRIEF DESCRIPTION OF DRAWINGS
[0013] The utility model will be further described in detail in combination with the drawings and specific embodiment.
[0014] Fig. 1 It is the structural schematic diagram of the utility model;
[0015] Fig. 2 It is the structural schematic diagram of the spiral cutting edge of the utility model;
[0016] In the drawing: 1, drill body;2, cutting edge;3, chip removal groove;4, R type chip breaker groove;5, drill tip structure. SPECIFIC EMBODIMENT
[0017] The technical scheme in the embodiment of the utility model will be described clearly and completely in combination with the embodiment of the utility model, and obviously, the described embodiment only is a part of the embodiment of the utility model, and is not all the embodiment. Based on the embodiment in the utility model, all other embodiments obtained by the ordinary skill in the art without making creative labor all relate to the scope of the utility model protection. EMBODIMENT
[0018] As Figs. 1-2As shown, the embodiment proposes a three-blade solid carbide drill bit with a broken chip groove at the drill tip, which comprises a drill body 1, the drill body 1 is cylindrical, the rear end can be connected to the main shaft of the machine tool, the drill body 1 is uniformly distributed with three cutting edges 2 in the circumferential direction, the three cutting edges 2 are distributed in a 120° circumferential array with the center axis of the drill body 1 as the center of symmetry, which ensures uniform distribution of cutting force, and a chip removal groove 3 is formed between adjacent cutting edges 2, R-type chip breaking grooves 4 are formed at the upper edge of each of the three cutting edges 2, the width of the R-type chip breaking groove 4 is 5% of the diameter of the drill body 1, the depth of the R-type chip breaking groove 4 is 3% of the diameter of the drill body 1, for example, if the diameter of the drill body 1 is 12mm, the width of the R-type chip breaking groove 4 is 0.6mm, the depth of the R-type chip breaking groove 4 is 0.36mm, the curvature radius of the R-type chip breaking groove 4 is 0.3-0.5mm, the bottom of the R-type chip breaking groove 4 is a circular arc surface, and the diameters of the three R-type chip breaking grooves 4 are different, such as 0.3mm, 0.4mm and 0.5mm, so as to break different positions of iron filings in a differentiated manner and avoid mutual entanglement of iron filings.
[0019] The front end of the drill body 1 is provided with a drill tip structure 5, and the angle of the drill tip structure 5 is 136°. The spiral angle of the chip removal groove 3 is 28°-32°, and the relief angle of the cutting edge 2 is 8°-12°. The parameter range can balance the cutting force and the chip removal capacity, especially when deep hole machining, the chip removal groove 3 can smoothly discharge the broken chips outside the hole.
[0020] The cutting edge 2 is provided with a coating, and the coating adopts fine-grained Al2O3 coating and nano-pillar structure MT-TiCN. It can effectively reduce the cutting resistance, inhibit the generation of built-up edge, and ensure the stability in the machining process.
[0021] The drill bit is made of K40 hard alloy, and the hardness can reach 89~95HRA, and the bending strength is ≥2100N / mm2, which is suitable for machining most materials such as quenched and tempered steel, stainless steel, low-carbon steel, alloy steel, gray cast iron, nodular cast iron, aluminum alloy, nickel-based alloy, titanium alloy, magnesium alloy, etc.
[0022] The structure design of the three cutting edges 2 of the drill bit forms a stable triangular support when the drill bit cuts into the workpiece, especially in complex working conditions such as cross holes and inclined surfaces, it is not easy to deviate, and the drilling precision is improved, the R-type chip breaking groove 4 is arranged at the edge of each cutting edge 2, which divides a single iron chip into two, the three iron chips of the three cutting edges 2 become six narrow iron chips, the iron chip width is reduced, the curling radius is smaller, and the iron chip can be smoothly discharged through the chip removal groove, avoiding blockage and tool wear, ensuring the stability and service life of the drilling, and cooperating with the special coating, the appropriate spiral angle and the relief angle, the problem of large cutting force and difficult chip removal of the tool is solved.
[0023] The above merely describes the preferred embodiments of the present application, and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A three-flute integral carbide drill bit with chip-breaking grooves at the tip, comprising a drill body (1), characterized in that: The drill body (1) has three cutting edges (2) evenly distributed in a circumferential array. Chip removal grooves (3) are formed between adjacent cutting edges (2). R-shaped chip breaking grooves (4) are opened at the upper edge of each of the three cutting edges (2). The width of the R-shaped chip breaking groove (4) is 5% of the diameter of the drill body (1), the depth of the R-shaped chip breaking groove (4) is 3% of the diameter of the drill body (1), and the diameters of the three R-shaped chip breaking grooves (4) are different. The front end of the drill body (1) is provided with a drill tip structure (5).
2. The three-flute integral carbide drill bit with chip-breaking grooves at the drill tip according to claim 1, characterized in that, The three cutting edges (2) are arranged in a 120° circular array with the central axis of the drill body (1) as the center of symmetry.
3. A three-flute solid carbide drill bit with chip-breaking grooves at the drill tip according to claim 1, characterized in that, The angle of the drill tip structure (5) is 136°.
4. A three-flute solid carbide drill bit with chip-breaking grooves at the drill tip according to claim 1, characterized in that, The helix angle of the chip removal groove (3) is 28°-32°, and the back angle of the cutting edge (2) is 8°-12°.
5. A three-flute solid carbide drill bit with chip-breaking grooves at the drill tip according to claim 1, characterized in that, The radius of curvature of the R-shaped chip breaker groove (4) is 0.3-0.5 mm, and the bottom of the R-shaped chip breaker groove (4) is an arc surface.