Tapping drill for forming taper hole at one time
By designing a symmetrical knife structure and a caramel surface treatment open-hole drill, the strength problem of the single forming of the conical hole of the superhard material is solved, and efficient processing and cost control are achieved.
Patent Information
- Application Number
- CN202421958064.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-14
- Publication Date
- 2025-07-11
- Estimated Expiration
- 2034-08-14
AI Technical Summary
When processing superhard materials, existing open hole drills are difficult to meet the strength requirements of primary forming conical holes.
An open drill is designed with a symmetrical knife body structure, including a long knife surface and a short knife surface, which provides greater structural strength for cutting and extrusion, a short knife surface for supporting and discharging chips, combined with a cartilage surface treatment to improve wear resistance.
It realizes efficient primary molding of ultrahard material conical holes, improves processing efficiency and cutting stability, and reduces manufacturing costs.
Smart Images
Figure CN223083868U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of cutting tools, in particular to a core drill for forming a tapered hole in one step. Background Art
[0002] In the process of forming a tapered hole on the surface of a workpiece, the forming accuracy and forming speed are key technical problems that have long concerned those skilled in the art. The existing core drills improve their strength by optimizing the number and structure of cutting edges, enabling them to form a tapered hole in one step. However, when dealing with super-hard materials such as silicon cores, the existing core drill structures still cannot fully meet the strength requirements. Summary of the Utility Model
[0003] The utility model provides a core drill for forming a tapered hole in one step.
[0004] Specifically, the utility model is realized through the following technical solutions:
[0005] An embodiment of the utility model provides a core drill for forming a tapered hole in one step, having an axis extending from the rear to the front, including:
[0006] A drill shank, provided at the rear;
[0007] A drill bit, provided at the front of the drill shank. The drill bit is symmetrically provided with a pair of cutting bodies extending along the axis direction. Each cutting body is provided with a top surface and an end surface, and the top surfaces of the pair of cutting bodies are formed to be enveloped by a conical contour in the axis direction;
[0008] Wherein, a notch groove is formed between the pair of cutting bodies in the circumferential direction of the cone, and each notch groove is composed of a short cutting surface of one cutting body and a long cutting surface of the other cutting body.
[0009] In some embodiments, a first longitudinal edge and a second longitudinal edge are respectively provided on both circumferential sides of the top surface of the cutting body.
[0010] In some embodiments, the end surface of the cutting body intersects with the long cutting surface to form a long end edge, and the end surface of the cutting body intersects with the short cutting surface to form a short end edge.
[0011] In some embodiments, the end surface of the cutting body intersects with the top surface to form a long end edge.
[0012] In some embodiments, the end surface is a conical surface.
[0013] In some embodiments, a bottom surface facing the front is provided at the rear of the notch groove, and an arc-shaped transition surface is formed between the bottom surface and the short cutting surface.
[0014] In some embodiments, a through hole penetrating the drill shank is formed at the rear of the notch groove for supplying water to the drill bit.
[0015] In some embodiments, both the first longitudinal edge and the second longitudinal edge are aligned with the axial direction.
[0016] In some embodiments, the long end edge and the short end edge are orthogonal to each other.
[0017] In some embodiments, the long end edge extends across the axis, and the short end edge is only provided on one side of the axis.
[0018] In some embodiments, the surface of the drill bit is electroplated or sintered to form emery.
[0019] According to the embodiments of the present invention, the long knife surface forming the notch groove has a larger structural size than the short knife surface, and correspondingly has greater structural strength. During the rotation of the hole-opening drill, the material cut by the first longitudinal edge is continuously extruded and broken by the long knife surface, and at the same time is supported by the short knife surface and accumulated in the notch groove, and then discharged along the bottom of the notch groove. Since the extrusion and breaking of the cut material require greater structural strength, the long knife surface is used to provide sufficient structural strength, while the short knife surface can release more structural size to the long knife surface, so that the hole-opening drill can meet the strength requirements for the one-time forming of a tapered hole in superhard materials.
[0020] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit this application. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] The drawings herein are incorporated into the specification and form a part of the specification, showing embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application.
[0022] Figure 1 is a schematic diagram of a first perspective of a hole-opening drill for one-time forming of a tapered hole in an embodiment of the present invention;
[0023] Figure 2 is a schematic diagram of a second perspective of a hole-opening drill for one-time forming of a tapered hole in an embodiment of the present invention;
[0024] Figure 3 is Figure 2 a partial enlarged view of part A in
[0025] Figure 4 is a side view of a hole-opening drill for one-time forming of a tapered hole in an embodiment of the present invention;
[0026] Figure 5 is a front view of a hole-opening drill for one-time forming of a tapered hole in an embodiment of the present invention.
[0027] Reference numerals:
[0028] 10: drill shank;
[0029] 20: Drill bit; 21: Cutter body; 211: Top surface; 212: Long cutter surface; 213: Short cutter surface; 214: End face; 215: First longitudinal edge; 216: Second longitudinal edge; 217: Long end edge; 218: Short end edge; 219: Top edge; 22: Notch groove; 221: Bottom surface; 222: Transition surface; 23: Through hole. Detailed implementation mode
[0030] The present utility model will now be described with reference to several embodiments. It should be understood that the description of these embodiments is only for enabling those of ordinary skill in the art to better understand and thus implement the present utility model, rather than implying any limitation on the scope of the present utility model.
[0031] As used herein, the term "comprising" and its variants are to be construed as open-ended terms meaning "including but not limited to"; the terms "embodiment" and "an embodiment" are to be construed as "at least one embodiment"; the term "another embodiment" is to be construed as "at least one other embodiment"; the terms "first", "second", etc. may refer to different or the same objects; the term "arranged" is not limited to direct connection or indirect connection, nor to a specific connection manner. There may also be other explicit and implicit definitions hereinafter.
[0032] In the following description, some specific numerical values or numerical ranges may be involved. It should be understood that these numerical values and numerical ranges are only exemplary, and they may be conducive to putting the idea of the present utility model into practice. However, the description of these examples is not intended to limit the scope of the present utility model in any way. According to specific application scenarios and requirements, these numerical values or numerical ranges can be set otherwise.
[0033] As described above, the structural strength of the existing hole-opening drill cannot meet the requirement of forming a tapered hole in a superhard material in one step. The hole-opening drill for forming a tapered hole in one step proposed by the embodiments of the present utility model at least partially solves the above problems. The following will refer to Figures 1 to 5 to describe the structure and working principle of the hole-opening drill for forming a tapered hole in one step according to the exemplary embodiments of the present utility model. As Figures 1 - 5 shown, the hole-opening drill for forming a tapered hole in one step according to the embodiment of the present utility model generally includes a drill shank 10 arranged at the rear and a drill bit 20 arranged at the front. Both the drill shank 10 and the drill bit 20 are in a form of rotational central symmetry as a whole. The rotation center is defined as the axis of the hole-opening drill, that is, the axis extends from the right rear to the front. The drill shank 10 is used to be clamped by the main shaft of the processing equipment, and the cutter body 21 arranged on the drill bit 20 is used to cut the workpiece material. Herein, "rear part" and "front part" are only used to conveniently describe the structural position relationship and are not used as specific scope limitations.
[0034] In one embodiment, a pair of cutter bodies 21 are symmetrically arranged with respect to the axis on the drill bit 20. The pair of cutter bodies 21 extend substantially axially from the rear to the front. "Symmetric" means that the positions and spacings of the pair of cutter bodies 21 in the circumferential direction of the drill bit 20 are the same. Specifically, each cutter body 21 has a top surface 211 and an end surface 214. The top surface 211 refers to the surface of the cutter body 21 that is radially away from the axis, and the end surface 214 refers to the surface presented at the outermost front end of the extension of the cutter body 21. The end surface 214 is used to contact the workpiece material first.
[0035] In one embodiment, to ensure the balanced rotation force of the opening drill during the process of forming a tapered hole and avoid excessive vibration of the opening drill, the top surfaces 211 of the pair of cutter bodies 21 are formed to be enveloped by a conical contour in the axial direction, as Figure 4 shown, that is, a symmetric conical surface in the axial direction, as Figure 5 shown. In the front view at any cross-sectional position of the axis, the contour of the top surfaces 211 of the pair of cutter bodies 21 exactly coincides with an imaginary circular contour.
[0036] In one embodiment, a gap is formed between the pair of cutter bodies 21 in the circumferential direction. The gap area is equivalent to a notch groove 22 cut out for the aforementioned imaginary circular contour. The length dimension of the notch groove 22 in the axial direction is the same as that of the cutter body 21. Specifically, a long cutting surface 212 and a short cutting surface 213 are respectively formed on both sides in the circumferential direction of each cutter body 21. Each notch groove 22 is defined by the long cutting surface 212 of one cutter body 21 and the short cutting surface 213 of the other cutter body 21. Among them, the long cutting surface 212 corresponds to the long edge 217 at the front of the cutter body 21, and the short cutting surface 213 corresponds to the short edge 218 at the front of the cutter body 21. The long edge 217 has a longer dimension than the short edge 218, so that the corresponding long cutting surface 212 has a larger area and correspondingly higher structural strength.
[0037] In one embodiment, a first longitudinal edge 215 and a second longitudinal edge 216 are respectively formed on both sides in the circumferential direction of each cutter body 21. For the convenience of description, the edge formed by the intersection of the long cutting surface 212 and the top surface 211 is defined as the first longitudinal edge 215, and the edge formed by the intersection of the short cutting surface 213 and the top surface 211 is defined as the second longitudinal edge 216. Exemplarily, the first longitudinal edge 215 and the second longitudinal edge 216 can be completely consistent with the axial direction. In this case, the notch groove 22 is formed as a straight groove. In another example, the first longitudinal edge 215 and the second longitudinal edge 216 can also be at an inclined angle or helically twisted with respect to the axial direction. In this case, since the inclination or twisting direction is towards the first longitudinal edge 215, the notch groove 22 is formed as a straight groove, an inclined groove or a helically twisted groove. Among them, the inclination angle or the helical twist angle is defined to be relatively small, such as 3 - 5 degrees, to avoid excessive local instantaneous force on the long cutting surface 212 due to too large an angle.
[0038] In one embodiment, the end face 214 of the tool body 21 may be a flat surface or a conical surface. Setting it as a conical surface is more conducive to positioning the midpoint of the conical hole on the surface of the workpiece material. As Figure 5 shown, when looking at the end face 214 from the front view, the end face 214 intersects with the long tool face 212 to form a long end edge 217, and intersects with the short tool face 213 to form a short end edge 218. When driving the hole drill to rotate counterclockwise along Figure 5 during the initial stage of the formation of the conical hole, the long end edge 217 cuts the workpiece material, and the short end edge 218 scrapes the cuttings that have been cut but not completely separated, so as to ensure that the material cut by the long end edge 217 can be completely peeled off.
[0039] In one embodiment, the end face 214 intersects with the top face 211 to form a top edge 219. Before the first longitudinal edge 215 contacts the material and starts cutting, the top edge 219 can be used to preliminarily position the cutting path of the first longitudinal edge 215 to avoid crosstalk and vibration during the cutting process of the first longitudinal edge 215.
[0040] In one embodiment, a through hole 23 penetrating the drill shank 10 is formed at the rear of the notch groove 22. The waterway system supplies coolant or lubricant to the notch groove 22 through the through hole 23, and supplies it to each cutting edge part through the notch groove 22. Therefore, it is ensured that the coolant or lubricant can be supplied to the required part almost along the shortest route, ensuring the efficient utilization of the coolant or lubricant.
[0041] In one embodiment, the rear of the notch groove 22 is provided with a bottom face 221 facing the front. The through hole 23 can be directly formed in the area of the bottom face 221. To improve the chip removal efficiency, an arc-shaped transition face 222 is formed between the short tool face 213 and the bottom face 221. The chips are pressed by the long tool face 212 on the short tool face 213, and the chips supported by the short tool face 213 slide along the short tool face 213 to the transition face 222. Under the arc-shaped guidance of the transition face 222, the chips are smoothly discharged from the bottom area of the notch groove 22, reducing the additional force load on the tool body 21 caused by chip accumulation.
[0042] In one embodiment, as Figure 5As shown, when viewed from the front view, the long end edge 217 and the short end edge 218 can be set to be orthogonal to each other, so that the corresponding long blade surface 212 and the short blade surface 213 are also orthogonal to each other. In this case, on the one hand, compared with the case where the long blade surface 212 and the short blade surface 213 form an acute angle, the notch groove 22 can have enough capacity to accommodate chips. On the other hand, compared with the case where the long blade surface 212 and the short blade surface 213 form an obtuse angle, the chips pressed down by the long blade surface 212 can be supported by the short blade surface 213 more quickly, avoiding sticking to the uncut material of the workpiece after sliding out of the notch groove 22 along the radial direction, thus hindering further cutting and forming. That is to say, the orthogonal state is the most balanced state between the two.
[0043] In one embodiment, as Figure 5 shown, when viewed from the front view, relative to the axis, the long end edge 217 extends from one side of the axis to the other side, while the short end edge 218 only extends on one axial side, so that on the basis of ensuring that the short end edge 218 is as long as possible and ensuring that the long end edge 217 is longer than the short end edge 218, the cross-section of the drill bit 20 is in a "double-sector" shape, and the connecting part between the two cutting bodies 21 in the "double-sector" shape has sufficient connection strength.
[0044] In one embodiment, diamond abrasives are electroplated or sintered on the surface of the drill bit. The diamond abrasives make the drill bit have higher surface hardness and are more suitable for processing super-hard materials. Compared with the scheme of making the whole drill bit of diamond, the manufacturing cost of the drill bit is greatly reduced, thus forming a drill bit with good inner core rigidity and toughness and high surface hardness.
[0045] According to the core drill provided by the embodiment of the present invention, during the process of forming a tapered hole in a super-hard material at one time, the core drill is driven to rotate in the Figure 5 counterclockwise direction shown in the figure. The whole forming process is divided into two stages. In the first stage, the long end edge 217 is used to cut the surface of the super-hard material, and the short end edge 218 is used to scrape and separate the chips. In the second stage, as the first longitudinal edge 215 starts to cut the super-hard material on the outer wall of the tapered hole, the second longitudinal edge 216 scrapes the super-hard material on the outer wall of the tapered hole, so that the chips not completely cut by the first longitudinal edge 215 are completely peeled off; further, the chips cut and peeled off by the first longitudinal edge 215 fall into the notch groove 22, and the chips scraped and peeled off by the second longitudinal edge 216 also fall into the notch groove 22. As the core drill rotates, the long blade surface 212 squeezes, breaks and pushes the chips, and the short blade surface 213 supports the chips, and they work together to make the chips rotate along with the notch groove 22 and guide the chips to be discharged along the bottom of the notch groove 22; among them, because the long blade surface 212 has a larger structural size, it can meet the structural strength required for squeezing and breaking the chips, thus ensuring the smooth completion of the one-time forming process of the tapered hole in the super-hard material.
[0046] In the description of the embodiments herein, any reference to directions and orientations is for the convenience of description only and should not be construed as any limitation to the scope of protection of the present utility model. The description of the preferred embodiments may involve combinations of features, which may exist independently or in combination. The present utility model is not particularly limited to the preferred embodiments. The scope of the present utility model is defined by the claims.
[0047] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present utility model shall be included within the scope of protection of the present utility model.
Claims
1. A hole-opening drill for one-time forming of a tapered hole, having an axis extending from back to front, characterized in that, Comprising: A drill shank (10), arranged at the rear; A drill bit (20), arranged at the front of the drill shank (10), a pair of cutter bodies (21) extending along the axis direction are symmetrically arranged on the drill bit (20), each cutter body (21) is provided with a top surface (211) and an end surface (214), and the top surfaces (211) of the pair of cutter bodies (21) are formed to be enveloped by a conical contour in the axis direction; Wherein, a notch groove (22) is formed between the circumferences of the pair of cutter bodies (21), and each notch groove (22) is composed of a short cutting surface (213) of one cutter body (21) and a long cutting surface (212) of the other cutter body.
2. The hole drilling tool for one-time forming of a tapered hole according to claim 1, characterized in that, First longitudinal edges (215) and second longitudinal edges (216) are respectively arranged on both circumferential sides of the top surface (211) of the cutter body (21).
3. The hole-opening drill for one-time forming of a tapered hole according to claim 1, characterized in that The end surface (214) of the cutter body (21) intersects with the long cutting surface (212) to form a long end edge (217), and the end surface (214) of the cutter body (21) intersects with the short cutting surface (213) to form a short end edge (218).
4. The hole-opening drill for one-time forming of a tapered hole according to claim 1, characterized in that, The end surface (214) of the cutter body (21) intersects with the top surface (211) to form a tip edge (219).
5. The hole-opening drill for one-time forming of a tapered hole according to claim 1, wherein The end surface (214) is a conical surface.
6. The hole-opening drill for one-time forming of a tapered hole according to claim 1, characterized in that, A bottom surface (221) facing the front is arranged at the rear of the notch groove (22), and an arc-shaped transition surface (222) is formed between the bottom surface (221) and the short cutting surface (213).
7. The hole-opening drill for one-time forming of a tapered hole according to claim 1, characterized in that, A through hole (23) penetrating the drill shank (10) is formed at the rear of the notch groove (22) for supplying water to the drill bit (20).
8. The hole-opening drill for one-time forming of a tapered hole according to claim 2, characterized in that, Both the first longitudinal edge (215) and the second longitudinal edge (216) are consistent with the axis direction.
9. The hole-opening drill for one-time forming of a tapered hole according to claim 3, characterized in that, The long end edge (217) and the short end edge (218) are orthogonal to each other.
10. The hole-opening drill for one-time forming of a tapered hole according to claim 3, characterized in that, The long end edge (217) extends across the axis, and the short end edge (218) is only arranged on one side of the axis.
11. The hole-opening drill for one-time forming of a tapered hole according to claim 1, characterized in that, The surface of the drill bit (20) is electroplated or sintered to form diamond grit.