Twist drill with microgrooves
By setting microgrooves in the helical chip removal groove of the twist drill, the problem of reduced drill life caused by cutting heat and coating peeling is solved, achieving efficient cutting in difficult-to-machine materials and extending drill life.
Patent Information
- Application Number
- CN202520130147.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-20
- Publication Date
- 2026-01-02
- Estimated Expiration
- 2035-01-20
AI Technical Summary
Existing drill bits suffer reduced lifespan during machining due to cutting heat and coating peeling, especially when drilling difficult-to-machine materials such as stainless steel, titanium alloys, and high-temperature alloys. Furthermore, current technologies struggle to effectively reduce cutting heat.
Microgrooves are set in the spiral chip removal groove of the twist drill near the cutting edge. The microgrooves extend from the main cutting edge to the rake face of the chisel edge, reducing the direct contact area between the chip and the rake face. The microgrooves also promote chip bending to reduce cutting heat and twist radius.
By reducing cutting heat and improving chip breaking performance, the service life and cutting efficiency of twist drills are significantly improved.
Smart Images
Figure CN223748624U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to metal cutting technical field, concretely relates to a twist drill with micro groove. BACKGROUND
[0002] In the machining process, the rake face of the drill bit and the chip will produce violent extrusion and friction, which is not only one of the main sources of drill cutting heat, but also has a very high requirement for the coating of the rake face of the drill bit, which makes the rake face of the drill bit prone to coating peeling in the drilling process, and the coating peeling of the rake face of the drill bit is one of the important reasons for reducing the service life of the drill bit. After the coating peeling, the blade edge is prone to built-up edge, reducing the machining life of the drill bit.
[0003] The rake face micro groove and micro texture structures have been applied in the blade field. Both theoretically and practically, the rake face micro groove and micro texture effectively reduce the rake face friction and effectively improve the service life of the tool. However, in the drill bit field, due to the irregularity of the rake face of the drill bit, the machining difficulty is high, and interference phenomenon is prone to occur during grinding. The positioning difficulty is high by using other machining methods such as laser machining, and it is relatively difficult to realize, and the processing cost is high, so this method has not been applied to the drill bit field.
[0004] In the drilling process of difficult-to-machine materials such as stainless steel, titanium alloy and high-temperature alloy, reducing the actual cutting heat is an effective way to improve the service life of the drill bit, and the existing technology only improves the in-groove smoothness of the drill bit, but the effect is not very good. UTILITY MODEL CONTENTS
[0005] The technical problem to be solved by the utility model is to overcome the shortcomings of the prior art, and to provide a twist drill with micro groove, which reduces the heat generated by cutting, improves the service life, increases the chip breaking effect, and improves the cutting effect.
[0006] To solve the above technical problems, the utility model adopts the following technical scheme:
[0007] A twist drill with micro groove, comprising a cutting part and a shank part, the front end of the cutting part is provided with a drill tip, the rear end is connected with the shank part, the drill tip has a cross blade dressing rake face and a cutting edge, the cutting part is provided with two spiral chip removal grooves extending from the drill tip to the shank part, the cutting part forms a blade petal between the two spiral chip removal grooves, the front end of the blade petal is provided with a main blade belt, the part of the spiral chip removal groove close to the cutting edge is provided with a micro groove, and the micro groove extends from the main blade belt to the cross blade dressing rake face.
[0008] As a further improvement of the above technical scheme:
[0009] The micro groove is arranged in parallel with the cutting edge.
[0010] The distance L1 between the micro groove and the cutting edge is 0.05mm-2mm.
[0011] The width L2 of the micro groove is 0.05-3mm, and the depth H of the micro groove is 0.02-2mm.
[0012] The cross-sectional shape of the micro groove is arc-shaped, V-shaped or hook-shaped.
[0013] The micro groove is a straight groove.
[0014] The micro groove is arranged at an acute angle with the cutting edge, and the included angle between the micro groove and the cutting edge is -10°-0 or 0-10°.
[0015] The diameter d of the cutting part is 1-30mm.
[0016] The number of the micro groove is one.
[0017] The number of the micro groove is multiple, and the interval L3 between adjacent micro grooves is 0-1mm.
[0018] Compared with the prior art, the advantages of the utility model lie in that:
[0019] The twist drill with micro groove of the utility model has the micro groove arranged on the part of the spiral chip removal groove close to the cutting edge, the micro groove extends from the main blade to the horizontal blade, the direct contact area of the chip and the rake face of the cutting edge is reduced, the heat generated by cutting is reduced, and the service life is prolonged. BRIEF DESCRIPTION OF DRAWINGS
[0020] Figure 1 is the front view structural schematic diagram of the embodiment one of the twist drill with micro groove of the utility model.
[0021] Figure 2 is the side view structural schematic diagram of the embodiment one of the twist drill with micro groove of the utility model.
[0022] Figure 3 is the structural schematic diagram of the micro groove part of the embodiment one of the twist drill with micro groove of the utility model.
[0023] Figure 4 is Figure 1 the sectional view structural schematic of A-A in Figure 1 .
[0024] Figure 5 is Figure 1 the sectional view structural schematic of A-A in Figure 2 .
[0025] Figure 6 isFigure 1 Cross-sectional structure of A-A Figure 3 .
[0026] Figure 7 Figure 2 is a structure diagram of the micro groove part of the embodiment two of the twist drill with micro groove.
[0027] Figure 8 Figure 3 is a cross-sectional view of the micro groove part of the embodiment two of the twist drill with micro groove.
[0028] Figure 9 Figure 4 is a use state diagram of the twist drill with micro groove.
[0029] The various reference signs in the drawings represent:
[0030] 1, cutting part; 2, shank part; 3, drill tip; 4, transverse land relief surface before grinding; 5, helical flute; 6, blade petal; 7, main blade band; 8, micro groove; 9, cutting edge. DETAILED DESCRIPTION
[0031] The utility model will be further described in detail below in combination with the drawings and specific embodiments.
[0032] In the description of the utility model, it is understood that the directions or position relations indicated by the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the directions or position relations shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the utility model.
[0033] In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "multiple" is two or more, unless otherwise specifically limited.
[0034] In the utility model, unless otherwise specifically defined and limited, the terms "assembly", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication or interaction relationship between two elements. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.
[0035] Implementation of List 1:
[0036] Figures 1 to 6 This invention illustrates a first embodiment of a microgrooved twist drill. The microgrooved twist drill of this embodiment includes a cutting part 1 and a shank 2. The cutting part 1 has a drill tip 3 at its front end and is connected to the shank 2 at its rear end. The drill tip 3 has a chisel edge grinding face 4 and a cutting edge 9. The cutting part 1 has two spiral chip removal grooves 5 extending from the drill tip 3 to the shank 2. A cutting edge 6 is formed between the two spiral chip removal grooves 5. The front end of the cutting edge 6 has a main cutting edge band 7. The portion of the spiral chip removal grooves 5 near the cutting edge 9 has a microgroove 8. The microgroove 8 extends from the main cutting edge band 7 to the chisel edge grinding face 4.
[0037] This twist drill with microgrooves has microgrooves 8 in the spiral chip removal groove 5 near the cutting edge 9. These microgrooves 8 extend from the main cutting edge 7 to the rake face 4 of the chisel edge. During machining, if... Figure 9 As shown, this reduces the direct contact area between the chip and the rake face of the cutting edge, thereby reducing the heat generated during cutting and increasing service life. Simultaneously, when the latter half of the microgroove 8 contacts the chip, it promotes chip bending, thus reducing the cutting twist radius, increasing chip breaking effect, and improving cutting performance.
[0038] Furthermore, in this embodiment, the microgroove 8 is arranged parallel to the cutting edge 9, which facilitates processing.
[0039] Furthermore, in this embodiment, the distance L1 between the microgroove 8 and the cutting edge 9 is 0.05mm to 2mm, resulting in good chip breaking and cutting effects.
[0040] Furthermore, in this embodiment, the width L2 of the microgroove 8 is 0.05–3 mm, and the depth H of the microgroove 8 is 0.02–2 mm.
[0041] Furthermore, in this embodiment, the cross-sectional shape of the microgroove 8 can be as follows: Figure 5 The arc shown can also be as follows: Figure 6 The V-shape shown, or as... Figure 4 The hook shape is shown. Of course, the cross-sectional shape of the microgroove 8 is not limited to arc, V-shape and hook shape, but can also be other required shapes.
[0042] Furthermore, such as Figure 3 As shown, in this embodiment, the microgroove 8 is a straight groove, which is easy to process and has good chip breaking and cutting effects.
[0043] Furthermore, in this embodiment, the diameter d of the cutting part 1 is 1 to 30 mm.
[0044] Furthermore, in this embodiment, the number of microgrooves 8 is one.
[0045] Further, in the embodiment, the twist drill is made of tungsten-cobalt hard alloy material, but is not limited to such base material, and the cutting portion 1 can be coated.
[0046] Embodiment two:
[0047] Figure 7 and Figure 8 The second embodiment of the twist drill with micro-grooves is shown, and the structure of the embodiment is basically the same as that of the first embodiment, and the difference is that the number of micro-grooves 8 is multiple, and the distance L3 between adjacent micro-grooves 8 is 0-1 mm. The distance L1 between the micro-groove 8 closest to the cutting edge 9 and the cutting edge 9 is 0.05 mm-2 mm.
[0048] Embodiment three:
[0049] The third embodiment of the twist drill with micro-grooves is shown, and the structure of the embodiment is basically the same as that of the first embodiment or the second embodiment, and the difference is that the micro-groove 8 is arranged at an acute angle with the cutting edge 9, and the included angle between the micro-groove 8 and the cutting edge 9 is -10°-0 or 0-10°.
[0050] Embodiment four:
[0051] The processing method of the micro-groove 8 of the twist drill with micro-grooves of the first embodiment, the second embodiment and / or the third embodiment is that the micro-groove 8 is ground on a numerical control grinding machine, and then the sawtooth at the intersection line between the micro-groove 8 and the spiral chip flute 5 is removed by adopting a surface treatment process such as spraying diamond or diamond brush polishing, so as to achieve a smooth and bright surface effect.
[0052] In the embodiment, the granularity of the fine-grained formed grinding wheel can be selected according to the actual grinding amount of the micro-groove 8; the surface finish required at the intersection line between the micro-groove 8 and the spiral chip flute 5 is Ra0.2 or less, and no obvious sawtooth is observed under 100 times of optical microscope.
[0053] Although the utility model has been disclosed as above with the preferred embodiments, it is not intended to limit the utility model. Any person skilled in the art can make many possible changes and modifications to the utility model technical solution or modify it into equivalent embodiments with equivalent changes without departing from the scope of the utility model technical solution. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the utility model technical solution shall fall within the scope of protection of the utility model technical solution.
Claims
1. A twist drill with micro-grooves, comprising a cutting part (1) and a shank part (2), the front end of the cutting part (1) is provided with a drill tip (3), the rear end is connected with the shank part (2), the drill tip (3) has a transverse land resharpening rake face (4) and a cutting edge (9), the cutting part (1) is provided with two spiral flutes (5) extending from the drill tip (3) to the shank part (2), the cutting part (1) forms a land lobe (6) between the two spiral flutes (5), the front end of the land lobe (6) is provided with a main land band (7), characterized in that: The part of the spiral chip flute (5) close to the cutting edge (9) is provided with a micro groove (8), and the micro groove (8) extends from the main blade band (7) to the transverse blade dressing rake face (4).
2. The micro-grooved twist drill according to claim 1, wherein: The micro groove (8) is parallel to the cutting edge (9).
3. The micro-grooved twist drill according to claim 2, wherein: The distance L1 between the micro groove (8) and the cutting edge (9) is 0.05mm-2mm.
4. The micro-grooved twist drill according to claim 1, wherein: The width L2 of the micro groove (8) is 0.05-3mm, and the depth H of the micro groove (8) is 0.02-2mm.
5. The micro-grooved twist drill according to claim 1, wherein: The cross-sectional shape of the micro groove (8) is arc-shaped, V-shaped or hook-shaped.
6. The micro-grooved twist drill according to claim 1, wherein: The micro groove (8) is a straight groove.
7. The micro-grooved twist drill according to claim 1, wherein: The micro groove (8) is arranged at an acute angle with the cutting edge (9), and the included angle between the micro groove (8) and the cutting edge (9) is-10°-0 or 0-10°.
8. The micro-grooved twist drill according to claim 1, wherein: The diameter d of the cutting part (1) is 1-30mm.
9. The micro-grooved twist drill according to any one of claims 1 to 8, wherein: The number of the micro groove (8) is one.
10. The micro-grooved twist drill according to any one of claims 1 to 8, characterized in that: The number of the micro groove (8) is multiple, and the spacing L3 between adjacent micro grooves (8) is 0-1mm.