A high-precision machining drill bit

Abstract

This utility model belongs to the field of drill bit technology, specifically relating to a high-precision drill bit, comprising: a base with three sets of equidistant cutting blades integrally formed at its top, and a circular chip removal platform machined at the center of the top of the base; cutting blades with a layered cutting mechanism on their surface, including two columns welded to the end face of the cutting blades; and mounting holes formed at the bottom of the base for mounting the base to the spindle. The integrally formed structure of this utility model can effectively improve the strength of the cutting blades and prevent vibration during the machining process, thereby effectively improving the machining accuracy of the holes.

Description

Technical Field

[0001] This utility model relates to the field of drill bit processing technology, and in particular to a high-precision drill bit. Background Technology

[0002] In the field of machining, the purpose of machining drills is to achieve rapid hole opening. The existing utility model patent CN202122649749.7 describes a stepped rapid drilling coreless drill bit. Its cutting edge has a fan-shaped cross-section, and the position where it is fixedly connected to the base is the narrowest part of the cutting edge, which increases the risk of breakage during machining. Moreover, since its single cutting edge cannot achieve automatic centering through the principle of cutting force balance, and there is no corresponding conical guide, it is very easy to cause center deviation during machining rotation. The impact between the cutting edge and the hole wall will form a vibration, thereby damaging the cutting edge. It is impossible to guarantee the drilling perpendicularity and machining accuracy. Utility Model Content

[0003] The purpose of this utility model is to provide a high-precision machining drill bit, comprising: The base has three sets of equidistant machining blades integrally formed at its top, and a circular chip removal platform is machined at the center of the top of the base. The cutting blade has a surface-machined layered cutting mechanism, which includes two pillars welded to the end face of the cutting blade. Mounting holes are provided at the bottom of the base for mounting the base to the spindle.

[0004] Preferably, a conical guide surface is machined at the center of the mounting hole, and an arc-shaped guide surface is machined on the side of the chip removal platform. The intersection point of the arc-shaped guide surface and the extension line of the axial height of the conical guide surface are on the same straight line.

[0005] Preferably, the thickness of the processing blade decreases uniformly from left to right, the mounting groove for welding the column is two arcs, the mounting groove fits the side wall of the column, and the bottom diameter of the column is greater than the depth of the mounting groove.

[0006] Preferably, a diamond guide bar is welded to the end of the column away from the processing blade.

[0007] Preferably, both the chip removal platform and the arc-shaped guide surface are provided with chip removal holes, and the chip removal holes are connected to the mounting holes.

[0008] The beneficial effects of this utility model are: By integrating the base and the cutting tool, the strength of the connection between the cutting tool and the base is increased, preventing the cutting tool from breaking during use. By welding the column body into the mounting groove that fits its side wall, displacement of the column body during stress is effectively prevented, and the guiding strength of the column body is improved by the outermost guide bar. The conical guide surface at the inner axis and the arc-shaped guide surface on the side of the chip removal platform enable the entire drill bit to achieve self-centering, further ensuring drilling perpendicularity and machining accuracy.

[0009] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0010] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0011] Figure 1 This is a top view structural diagram of the base according to an embodiment of the present invention; Figure 2 This is a structural view of the base bottom of an embodiment of this utility model; Figure 3 This is a cross-sectional structural diagram of an embodiment of the present utility model; Figure 4 This is an enlarged view of the processing blade in an embodiment of this utility model.

[0012] In the picture: 1. Base, 2. Machining blade, 3. Chip removal platform, 4. Column, 5. Mounting hole, 6. Conical guide surface, 7. Arc-shaped guide surface, 8. Mounting groove, 9. Diamond guide bar, 10. Chip removal hole. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0014] like Figures 1 to 4As shown, this embodiment provides a high-precision machining drill bit, including: a base 1, the top of which is integrally formed with three sets of equidistant machining inserts 2. The center of the top of the base 1 is machined into a circular chip removal platform 3, which eliminates the central drilling part of the traditional drill bit, greatly reducing the weight of the top and the machining load, and leaving enough space for the chips generated during cutting to increase chip removal efficiency; machining inserts 2, the surface of which is machined into a layered cutting mechanism, including two columns 4 welded to the end face of the machining insert 2 to form a stepped segmented machining, which pre-drills holes before the machining insert 2 to avoid excessive force on the insert and breakage due to excessive depth of cut at one time; and mounting holes 5, which are opened at the bottom of the base 1 for mounting the base 1 to the spindle, and have mounting threads inside.

[0015] A conical guide surface 6 is machined at the center of the mounting hole 5, and an arc-shaped guide surface 7 is machined on the side of the chip removal platform 3. The intersection of the extensions of the arc-shaped guide surface 7 and the extension line of the axial height of the conical guide surface 6 are on the same straight line. Through this double guide structure, the drill bit as a whole achieves a self-centering effect through the principle of balance during processing, preventing the center from shifting during processing, thereby ensuring the perpendicularity of the machined hole and the processing accuracy of the hole wall.

[0016] The thickness of the machining insert 2 decreases uniformly from left to right. The outermost left edge is machined with a larger apex angle of 118° to enhance cutting strength, while the apex angle decreases towards the right to reduce axial force, resulting in a more balanced cutting force distribution and reduced vibration and hole diameter deviation. Since the column 4 and the machining insert 2 are not integral structures, the mounting groove 8 for welding the column 4 onto the upper surface of the machining insert 2 needs to be set as two arcs, allowing the mounting groove 8 to fit snugly against the sidewall of the column 4. This eliminates assembly gaps, prevents loosening or misalignment of straight grooves due to tolerances, and significantly improves the connection rigidity between the column 4 and the machining insert 2. Simultaneously, to ensure that the column 4 contacts the hole wall before the machining insert 2 during drilling, scraping open the hard layer, the bottom diameter of the column 4 is greater than the depth of the mounting groove 8.

[0017] To enhance the wear resistance and surface rigidity of the column 4, a diamond guide 9 is welded to the end of the column 4 away from the processing blade 2. The diamond guide 9 enhances the impact resistance of the column 4 through its high hardness, thereby further increasing the service life of the column 4 and the drill bit.

[0018] Both the chip removal platform 3 and the arc-shaped guide surface 7 are provided with chip removal holes 10, which are connected to the mounting hole 5. When drilling is in progress, water or cutting fluid can be injected into the mounting hole 5 from the rear end in accordance with conventional practices in the art. This will not only provide a cooling effect but also effectively remove surface chips and prevent long chips from getting tangled with the drill bit inside the narrow hole.

[0019] In summary, the core key aspects of this embodiment are: the base 1 employs a centerless circular chip removal platform 3 at its top, reducing the weight of the top and coordinating with the chip removal hole 10 and the mounting hole 5 to improve the efficiency of cutting fluid injection and chip removal, preventing long chips from entangled in narrow holes. Three sets of equidistant machining inserts 2 are integrated into a stepped column structure 4, forming a layered cutting mechanism. Pre-drilling reduces the depth of cut per pass, preventing insert breakage; the insert thickness decreases uniformly from the outer edge to the center, and the apex angle decreases gradually from 118°, balancing the cutting force distribution and reducing vibration and hole diameter deviation. The conical guide surface 6 inside the mounting hole and the arc-shaped guide surface 7 of the chip removal platform 3 form a double self-centering structure, ensuring the perpendicularity of the machined hole. The non-integral column 4 fits into the arc-shaped mounting groove 8, eliminating assembly gaps and improving connection rigidity; diamond guide bars 9 are welded to the ends of the column 4, enhancing wear resistance and impact resistance, and extending drill bit life.

[0020] All the devices selected in this application (parts whose specific structures are not specified) are general standard parts or parts known to those skilled in the art. Their structures and principles can be learned by those skilled in the art through technical manuals or conventional experimental methods.

[0021] In the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A high-precision machining drill bit, characterized by, include: The base (1) has three sets of equidistant machining blades (2) integrally formed at its top, and the center of the top of the base (1) is machined into a circular chip removal platform (3). The cutting blade (2) has a surface processed into a layered cutting mechanism, including two columns (4) welded to the end face of the cutting blade (2); Mounting hole (5) is provided at the bottom of the base (1) for mounting the base (1) to the spindle; A conical guide surface (6) is machined at the center of the mounting hole (5), and an arc-shaped guide surface (7) is machined on the side of the chip removal platform (3). The extension intersection point of the arc-shaped guide surface (7) and the extension line of the axial height of the conical guide surface (6) are on the same straight line.

2. The high-precision machining drill bit according to claim 1, characterized in that: The thickness of the processing blade (2) decreases uniformly from left to right. The mounting groove (8) for welding the column (4) is two arcs. The mounting groove (8) fits the side wall of the column (4). The bottom diameter of the column (4) is greater than the depth of the mounting groove (8).

3. The high-precision machining drill bit according to claim 2, characterized in that: A diamond guide bar (9) is welded to the end of the column (4) away from the processing blade (2).

4. The high-precision machining drill bit according to claim 1, characterized in that: Both the chip removal platform (3) and the arc-shaped guide surface (7) are provided with chip removal holes (10), and the chip removal holes (10) are connected to the mounting holes (5).

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