PCD composite drill bit
By designing PCD composite drill bits, which employ staggered tooth distribution and special groove design, the problem of tool wear caused by cutting heat in carbon fiber composite material processing has been solved, extending tool life and improving processing quality and efficiency.
Patent Information
- Application Number
- CN202520302392.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-25
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2035-02-25
AI Technical Summary
The cutting heat generated during the processing of carbon fiber composite materials leads to local softening, deformation, chipping, burrs, and rapid tool wear, making it difficult to achieve ideal processing results and quality. Furthermore, frequent tool replacements increase costs.
The PCD composite drill bit is designed with a drill body and a drill tip. The drill tip has an end cutting edge and a peripheral cutting edge. It features a tapered flank face with staggered teeth and a special groove design. Combined with the wear resistance of PCD material and a high-gloss polishing process, it extends the tool life.
It effectively alleviates chipping, burrs, and delamination at the part exit, extends tool life, improves production efficiency, and reduces production costs.
Smart Images
Figure CN223820679U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of precision machining technology, specifically to a PCD composite drill bit. Background Technology
[0002] Carbon fiber reinforced polymer (CFRP) composites are characterized by light weight, high strength, low density, and good corrosion resistance. They are widely used in industries such as military, aerospace, and automotive. They can reduce weight while ensuring structural strength, making them suitable for applications with strict requirements on weight and strength.
[0003] Furthermore, due to the industrial applications of carbon fiber composite materials, enterprises are becoming increasingly strict in their quality control of processed products. As carbon fiber composite materials generate a large amount of cutting heat during processing, this heat can cause local softening, deformation, or even scorching of the material, increasing processing difficulty and making it prone to chipping, burrs, delamination, or breakage during tool processing. Consequently, the material wear of the parts leads to rapid tool wear, requiring frequent tool replacements, which not only affects production efficiency but also results in high costs. Although cutting heat is dissipated in a timely manner during processing, the use of traditional tools still cannot alleviate chipping, burrs, and delamination at the part exit, making it difficult to achieve ideal processing results and quality. Utility Model Content
[0004] This invention provides a PCD composite drill bit to solve the problems mentioned in the background art.
[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:
[0006] A PCD composite drill bit includes a drill body and a drill tip. The drill body has an end cutting edge and a peripheral cutting edge arranged sequentially at the drill tip. The end cutting edge is formed by two conical flank faces with staggered teeth. Chip-breaking grooves are respectively opened on the surfaces of the two flank faces. The peripheral cutting edge has a cutting band on its surface. The cutting band includes a first cutting band segment, a second cutting band segment, and a third cutting band segment. An interval segment is provided between the second cutting band segment and the third cutting band segment. A transition segment is provided between the third cutting band segment and the flank face.
[0007] Preferably, the drill body includes a guide section and a PCD cutting section. One end of the guide section is provided with a mating groove. The PCD cutting section is disposed in the mating groove and is coaxially disposed with the guide section. The chip-breaking groove, the second cutting edge segment, and the third cutting edge segment are respectively disposed on the PCD cutting section, and the first cutting edge segment is disposed on the guide section.
[0008] Preferably, the two back facets each include a first cutting face and a second cutting face provided on the surface of the PCD cutting part, and a third cutting face provided on the surface of the guide part, and the chip-breaking groove is formed on the first cutting facet.
[0009] Preferably, one chip-breaking groove is provided on one of the flank faces, and two chip-breaking grooves are provided on the other flank face.
[0010] Preferably, the end of the guide portion away from the PCD cutting portion is connected to a shank portion, and the guide portion and the shank portion are coaxially arranged.
[0011] Preferably, two chip removal grooves are provided on the outer wall of the drill body, and the two chip removal grooves are arranged in a spiral shape.
[0012] Preferably, guide slots are provided on the two rake faces of the PCD cutting part, and both guide slots are located on both sides of the transverse cutting edge of the PCD cutting part.
[0013] Preferably, the drill tip angle formed by the two back facets is α, where the angle value of α is 130°.
[0014] Preferably, one end of the second cutting edge segment and both ends of the third cutting edge segment are oblique cut surfaces, and the included angle between the two oblique cut surfaces on the third cutting edge segment is b, where b is 90°.
[0015] Preferably, the interval section and the transition section have the same depth, and the interval section and the transition section are respectively lower than the outer surface of the drill body.
[0016] By adopting the above technical solution, the beneficial effects achieved by this utility model are as follows:
[0017] In this invention, PCD material is selected as the cutting material to increase wear resistance. The drill tip adopts a staggered chip arrangement, and the peripheral cutting edge adopts a stepped design that matches the feed, as well as a special groove design and high-gloss polishing in the groove. These manufacturing processes effectively extend the tool life and alleviate phenomena such as chipping, burrs, and delamination at the part exit, ensuring machining quality. Furthermore, the extended tool life reduces the problem of frequent tool replacement, effectively improving production efficiency and reducing production costs. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model.
[0019] Figure 2 for Figure 1 Enlarged structural diagram of the selected area in the middle box.
[0020] Figure 3 This is a top view of the structure of this utility model.
[0021] Figure 4 This is a schematic diagram of the rear blade face of this utility model from one perspective.
[0022] Figure 5 This is a schematic diagram of the back face of the present invention from another perspective.
[0023] Figure 6 This is a schematic diagram of the blade of this utility model from one perspective.
[0024] Figure 7 This is a schematic diagram of the blade belt structure from another perspective of this utility model.
[0025] In the diagram: 1. Drill body; 2. Drill tip; 3. End cutting edge; 4. Circumferential cutting edge; 5. Chip removal groove; 6. Rake face; 61. First cutting face; 62. Second cutting face; 63. Third cutting face; 7. Chip separation groove; 8. Cutting edge; 81. First cutting edge section; 82. Second cutting edge section; 83. Third cutting edge section; 9. Interval section; 10. Transition section; 11. Guide section; 12. PCD cutting section; 13. Shank; 14. Guide groove. Detailed Implementation
[0026] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.
[0027] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.
[0028] like Figures 1-7 As shown, this utility model provides a PCD composite drill bit, including a drill body 1 and a drill tip 2. Two chip removal grooves 5 are provided on the outer wall of the drill body 1. The two chip removal grooves 5 are arranged in a spiral shape. The drill body 1 has an end cutting edge 3 and a peripheral cutting edge 4 arranged sequentially at the drill tip 2. The end cutting edge 3 is formed by a conical flank face 6 with two staggered teeth. Chip-breaking grooves 7 are respectively provided on the surface of the two flank faces 6. The surface of the peripheral cutting edge 4 is provided with a cutting edge 8. The cutting edge 8 includes a first cutting edge segment 81, a second cutting edge segment 82 and a third cutting edge segment 83. An interval segment 9 is provided between the second cutting edge segment 82 and the third cutting edge segment 83. A transition segment 10 is provided between the third cutting edge segment 83 and the flank face 6.
[0029] Combination Figure 6 and Figure 7As shown, the interval section 9 and the transition section 10 have the same depth, and the interval section 9 and the transition section 10 are respectively lower than the outer surface of the drill body 1. One end of the second cutting edge section 82 and the two ends of the third cutting edge section 83 are respectively oblique cutting surfaces, and the included angle of the two oblique cutting surfaces on the third cutting edge section 83 is b, where b is 90°. The surfaces of the interval section 9 and the transition section 10 are lower than the surface of the peripheral cutting edge 4. This allows the peripheral cutting edge 4 of the drill bit to adopt a stepped design that matches the feed of the machining process, which can extend the tool life. At the same time, it can also alleviate the phenomena of chipping, burrs, and delamination at the exit of the part to a certain extent. Thus, it can effectively improve the machining effect and machining quality.
[0030] Furthermore, in the actual production and manufacturing of the PCD composite drill bit proposed in this solution, the inner surfaces of multiple chip-breaking grooves 7, as well as the interval sections 9 and transition sections 10, need to be highly polished. The high-gloss polishing adopts existing publicly available technology, which is well known and applied by those skilled in the art, and will not be described in detail in this article.
[0031] As a further step, the drill body 1 includes a guide section 11 and a PCD cutting section 12. One end of the guide section 11 is provided with a mating groove. The PCD cutting section 12 is disposed in the mating groove and is coaxially disposed with the guide section 11. The chip-breaking groove 7, the second cutting edge segment 82 and the third cutting edge segment 83 are respectively disposed on the PCD cutting section 12. The first cutting edge segment 81 is disposed on the guide section 11. The end of the guide section 11 away from the PCD cutting section 12 is connected to a shank 13. The guide section 11 and the shank 13 are coaxially disposed.
[0032] Combination Figure 6 and Figure 7 As shown, specifically, the widths of the first cutting edge segment 81, the second cutting edge segment 82, and the third cutting edge segment 83 are all the same, and the interval segment 9 and one end of the second cutting edge segment 82 and the third cutting edge segment 83 are respectively provided with a chamfered surface. The transition segment 10 and one end of the third cutting edge segment 83 are also provided with a chamfered surface. The inner bottom surfaces of the interval segment 9 and the transition segment 10 are respectively lower than the surface of the peripheral cutting part 4, which causes the drill bit to form a stepped design through the special interval segment 9 and the transition segment 10. This ensures that the stepped design can match the machining process feed, alleviate the undesirable phenomena at the exit of certain parts, and indirectly extend the service life of the tool.
[0033] Furthermore, the PCD cutting part 12 is made of PCD material, which can increase the wear resistance of the tool and extend its service life.
[0034] As a further step, the two flank faces 6 each include a first cutting edge 61 and a second cutting edge 62 provided on the surface of the PCD cutting part 12 and a third cutting edge 63 provided on the surface of the guide part 11, and chip-breaking grooves 7 are provided on the first cutting edge 61. One chip-breaking groove 7 is provided on one flank face 6, and two chip-breaking grooves 7 are provided on the other flank face 6.
[0035] As a further step, guide slots 14 are provided on the two rake faces of the PCD cutting section 12, and both guide slots 14 are located on both sides of the transverse cutting edge of the PCD cutting section 12.
[0036] As a further step, the apex angle of the drill tip 2 formed by the two back faces 6 is α, where the angle value of α is 130°.
[0037] The functional characteristics of the composite drill bit in this embodiment are as follows: PCD material is selected as the cutting material to increase wear resistance, and the drill tip 2 adopts staggered chip arrangement, the peripheral cutting edge 4 adopts a stepped design that matches the feed, as well as a special groove design and high-gloss polishing in the groove, thereby extending the tool life and alleviating the phenomena of chipping, burrs, and delamination at the exit of the part, improving production efficiency and reducing production costs.
[0038] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0039] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.
Claims
1. A PCD composite drill bit, characterized in that, The drill body (1) includes a drill body (2) and a drill tip (2). The drill body (1) has an end cutting edge (3) and a peripheral cutting edge (4) arranged sequentially at the drill tip (2). The end cutting edge (3) is formed by a conical back face (6) with two staggered teeth. Chip-breaking grooves (7) are opened on the surfaces of the two back faces (6). The surface of the peripheral cutting edge (4) is provided with a cutting edge (8). The cutting edge (8) includes a first cutting edge segment (81), a second cutting edge segment (82) and a third cutting edge segment (83). A gap segment (9) is provided between the second cutting edge segment (82) and the third cutting edge segment (83). A transition segment (10) is provided between the third cutting edge segment (83) and the back face (6).
2. The PCD composite drill bit according to claim 1, characterized in that, The drill body (1) includes a guide part (11) and a PCD cutting part (12). One end of the guide part (11) is provided with a mating groove. The PCD cutting part (12) is disposed in the mating groove and is coaxially disposed with the guide part (11). The chip-breaking groove (7), the second cutting edge segment (82) and the third cutting edge segment (83) are respectively disposed on the PCD cutting part (12), and the first cutting edge segment (81) is disposed on the guide part (11).
3. A PCD composite drill bit according to claim 2, characterized in that, The two back face (6) respectively include a first cutting face (61) and a second cutting face (62) on the surface of the PCD cutting part (12) and a third cutting face (63) on the surface of the guide part (11), and the chip groove (7) is opened on the first cutting face (61).
4. A PCD composite drill bit according to claim 3, characterized in that, One chip-breaking groove (7) is provided on one of the back face (6), and two chip-breaking grooves (7) are provided on the other back face (6).
5. A PCD composite drill bit according to claim 2, characterized in that, The guide portion (11) is connected to a handle portion (13) at one end away from the PCD cutting portion (12), and the guide portion (11) and the handle portion (13) are coaxially arranged.
6. A PCD composite drill bit according to claim 5, characterized in that, Two chip removal grooves (5) are provided on the outer wall of the drill body (1), and the two chip removal grooves (5) are arranged in a spiral shape.
7. A PCD composite drill bit according to claim 6, characterized in that, The two rake faces of the PCD cutting part (12) are respectively provided with guide slots (14), and the two guide slots (14) are located on both sides of the transverse cutting edge of the PCD cutting part (12).
8. A PCD composite drill bit according to claim 1, characterized in that, The apex angle of the drill tip (2) formed by the two back facets (6) is a, where the angle value of a is 130°.
9. A PCD composite drill bit according to claim 1, characterized in that, One end of the second cutting edge segment (82) and both ends of the third cutting edge segment (83) are oblique cut surfaces, and the included angle between the two oblique cut surfaces on the third cutting edge segment (83) is b, where b is 90°.
10. A PCD composite drill bit according to claim 1, characterized in that, The interval section (9) and the transition section (10) have the same depth, and the interval section (9) and the transition section (10) are respectively lower than the outer surface of the drill body (1).