U-shaped drill blade

Abstract

The utility model discloses a U-shaped drill blade which comprises a blade body, the blade body comprises cutting edges with inclined angles, cutting edges of the cutting edges are sawtooth-shaped cutting edges, the cutting edges are arranged on the outer side of the blade body, and the cutting edges are in transition connection through tool nose fillets. The cutting edge comprises an outer cutting edge and an inner cutting edge, and the outer cutting edge and the inner cutting edge are connected through an arc edge; the blade further comprises a plurality of peripheral side faces and chip breaking tables, the chip breaking tables are evenly arranged at the positions, close to the cutting edges, of the blade body, and the distribution shape of the chip breaking tables corresponds to the distribution shape of the cutting edges. The cutting edge is connected with the outer edge of the peripheral side face, and a bottom installation face connected with the peripheral side face is arranged on the opposite side of the cutting edge. The reaping hook sawtooth-shaped continuous cutting edge structure on the blade enhances the chip breaking and cutting functions of the drill blade, and can meet the requirement for strong chip breaking under special working conditions.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the tool research and development manufacturing technical field, especially, relate to a U drill blade. BACKGROUND

[0002] U drill, a kind of indexable drill bit that can install drilling blade, because of its low cost and high efficiency drilling capacity, has become the first choice for medium or large diameter hole drilling with diameter-depth ratio of 2-5. However, in the process of using U drill blade processing, often encounter the problem that chip breaking cannot be broken or cannot meet the strong chip breaking effect, which not only affects the processing quality, but also may lead to poor hole surface quality.

[0003] At present, the blade type of most drilling blades in the industry is generally achieved by adopting single straight blade, straight blade with blade angle, multi-section straight ladder blade, curved blade, straight line and curved combination cutting edge and the way of digging groove, milling hole on cutting edge, so that cutting edge breaks off to achieve the purpose of chip breaking, but the above-mentioned blade structure cannot meet the strong chip breaking requirement under special working conditions, such as in U drill processing, too long chip will affect the effect of chip removal, and may cause tool and chip re-cutting, reduce the surface quality of workpiece, and the service life of tool cannot be guaranteed. The disadvantage of chip breaking groove is that the breaking-off place cannot participate in cutting or cutting is difficult.

[0004] The patent with the patent number CN209465744U discloses a single-face wave-shaped blade drilling blade; the blade body is single-sided; the blade is a polygonal body; a blade positioning hole is arranged at the geometric center thereof; the blade body includes an upper surface, a lower surface, a plurality of side surfaces connecting the upper surface and the lower surface, and corner surfaces between adjacent side surfaces; the blade is provided with three cutting units; the cutting unit is composed of a cutting edge formed by the intersection of two adjacent side surfaces and the upper surface, a corner edge formed by the intersection of the corner surface connecting the two adjacent side surfaces and the upper surface, and a chip breaking groove; the cutting edge is formed by alternately connecting straight cutting edges and wave-shaped cutting edges; the chip breaking groove is composed of straight chip breaking grooves and circular-arc chip breaking grooves; the straight chip breaking groove is composed of a straight rake face, a first chip breaking platform, a second chip breaking platform and a chip pocket; the circular-arc chip breaking groove is composed of a circular-arc rake face, a circular-arc chip breaking platform and a circular-arc chip pocket. The alternate design of straight line and circular-arc chip breaking groove of the patent performs well in conventional machining, but when high-speed drilling (such as linear velocity exceeding 300 m / min) or deep hole machining, the chip flow rate is accelerated, and the size (such as width 1.5-2.1 mm) of the existing chip pocket may be insufficient for rapid chip removal, leading to chip jamming or tool overheating, and the chip breaking requirement cannot be met. UTILITY MODEL CONTENTS

[0005] The utility model mainly aims at the blade structure in the prior art cannot satisfy the strong broken chip requirement under the special working condition, like U drill processing, too long cutting chip can influence the chip removal effect, simultaneously can cause the tool and cutting chip re cutting, reduces workpiece surface quality, and the service life of tool cannot be guaranteed.

[0006] A U drill blade, comprising a blade body, the blade body comprises a cutting edge with an inclination angle, the cutting edge is sawtooth-shaped, the cutting edge is arranged on the outer side of the blade body, and the cutting edges are connected by a nose radius transition; the cutting edge comprises an outer cutting edge and an inner cutting edge, the outer cutting edge and the inner cutting edge are connected by an arc edge; further comprising a plurality of circumferential side surfaces and a chip breaking platform, the chip breaking platforms are uniformly arranged on the blade body close to the cutting edge, and the distribution shape of the chip breaking platforms corresponds to the distribution of the cutting edge; the cutting edge is connected with the outer edge of the circumferential side surface, and the opposite side of the cutting edge is provided with a bottom mounting surface connected with the circumferential side surface.

[0007] Further, the blade body is a polygonal structure, and a screw hole is arranged at the center of the blade body.

[0008] Further, the chip breaking platform is a continuous sickle sawtooth structure.

[0009] Further, the size between the same positions on adjacent chip breaking platforms is 1mm.

[0010] Further, the chip breaking platform comprises a long inclined surface and a short inclined surface, and the long inclined surface and the short inclined surface are inclined in opposite directions to form a toothed structure.

[0011] Further, the distance between the adjacent two intersection points of the long inclined surface and the short inclined surface in the vertical direction is 0.08mm.

[0012] Further, the included angle between the long inclined surface and the short inclined surface is obtuse.

[0013] Further, the included angle alpha between the long inclined surface and the horizontal plane is 6 degrees, and the included angle beta between the short inclined surface and the horizontal plane is 30 degrees.

[0014] Further, the outer cutting edge and the inner cutting edge are each provided with three groups, and the outer cutting edge, the arc edge, the inner cutting edge and the nose radius are sequentially connected in the clockwise direction.

[0015] Further, the circumferential side surface on the blade body constitutes a relief surface, the relief surface comprises an outer cutting edge relief surface and an inner cutting edge relief surface, and the outer cutting edge relief surface and the inner cutting edge relief surface are connected by a circular surface transition.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] This invention includes a cutting edge with an inclined angle, the cutting edge of which is serrated. The cutting edge is located on the outer side of the insert body and is connected to each other by a rounded tip. The cutting edge includes an outer cutting edge and an inner cutting edge, which are connected by a circular arc. It also includes multiple circumferential surfaces and chip breaker platforms, which are evenly arranged on the insert body near the cutting edge, and the distribution shape of the chip breaker platforms corresponds to the distribution of the cutting edge. This invention can be indexably mounted on a tool holder or tool shank, reducing tool changing frequency. By adding a continuous serrated cutting edge structure to the cutting edge, the chip breaking and cutting functions of the drill insert are enhanced, meeting the strong chip breaking requirements under special working conditions. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a U-shaped drill bit;

[0019] Figure 2 A top view of a U-shaped drill bit;

[0020] Figure 3 A bottom view of a U-shaped drill bit;

[0021] Figure 4 A side view of a U-shaped drill bit;

[0022] Figure 5 This is a projected view of the chip breaker stage of a U-shaped drill bit.

[0023] In the above figure, 1. Insert body; 2. External cutting edge; 3. Internal cutting edge; 4. Chip breaker; 5. Bottom mounting surface; 6. Screw hole; 7. Circular arc edge; 8. Tool tip radius; 9. Long bevel; 10. Short bevel; 11. Rake face of external cutting edge; 12. Rake face of internal cutting edge; 13. Circular arc surface; α. Angle between the long bevel and the horizontal plane; β. Angle between the short bevel and the horizontal plane. Detailed Implementation

[0024] To clearly illustrate the technical features of this utility model, the present utility model will be described in detail below through specific embodiments and in conjunction with the accompanying drawings.

[0025] 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 scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0026] Furthermore, in the description of this utility model, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships 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. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0027] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0028] In this utility model, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first and second features, or indirect contact through an intermediate medium. In the description of this specification, references to terms such as "an embodiment," "some embodiments," "example," "specific example," or "some examples" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this utility model. 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.

[0029] Example 1

[0030] like Figure 1As shown, a U-shaped drill bit includes a bit body 1, which includes a cutting edge with an inclined angle. The cutting edge of the cutting edge is serrated and is located on the outer side of the bit body 1. The cutting edges are connected by a fillet 8 at the tip. The cutting edge includes an outer cutting edge 2 and an inner cutting edge 3, which are connected by an arc-shaped edge 7. The bit body also includes multiple peripheral surfaces and chip breaker 4. The chip breaker 4 are evenly arranged on the bit body 1 near the cutting edge, and the distribution shape of the chip breaker 4 corresponds to the distribution of the cutting edge. The cutting edge is connected to the outer edge of the peripheral surface, and a bottom mounting surface 5 is provided on the opposite side of the cutting edge, which is connected to the peripheral surface.

[0031] like Figure 2 , Figure 3 as well as Figure 4 As shown, in this embodiment, the blade body 1 adopts a hexagonal symmetrical structure design. A screw hole 6 with a diameter of 6mm is provided at the center of the blade body 1, facilitating the fixing of the blade to the cutter head or tool holder with screws. The blade body 1 can be indexably mounted on the cutter head or tool holder, reducing the number of tool changes and improving machining efficiency. The cutting edge has a serrated edge, consisting of three sets of alternating outer cutting edges 2 and inner cutting edges 3. Each set of outer cutting edges 2 and inner cutting edges 3 is connected by a 0.5mm radius arc edge 7, transitioning clockwise to the tool tip radius 8, forming a continuous cutting trajectory.

[0032] like Figure 1 and Figure 5 As shown, in this embodiment, the chip breaker 4 is designed as a continuous sickle-shaped structure. Multiple chip breaker 4s are evenly distributed near the end of the flank face and close to the cutting edge. The distance L between adjacent chip breaker 4s is 1 mm. The chip breaker 4 includes a long inclined plane 9 and a short inclined plane 10. The angle α between the long inclined plane 9 and the horizontal plane is 6°, and the angle β between the short inclined plane 10 and the horizontal plane is 30°. The vertical distance D between their intersection points is 0.08 mm. This structure, through the synergistic effect of the serrated cutting edge and the chip breaker 4, can quickly cut chips when machining high yield strength materials, avoid entanglement, reduce cutting edge wear, and improve the machining efficiency of parts.

[0033] Example 2

[0034] like Figure 1As shown, a U-shaped drill bit includes a bit body 1, which includes a cutting edge with an inclined angle. The cutting edge of the cutting edge is serrated and is located on the outer side of the bit body 1. The cutting edges are connected by a fillet 8 at the tip. The cutting edge includes an outer cutting edge 2 and an inner cutting edge 3, which are connected by an arc-shaped edge 7. The bit body also includes multiple peripheral surfaces and chip breaker 4. The chip breaker 4 are evenly arranged on the bit body 1 near the cutting edge, and the distribution shape of the chip breaker 4 corresponds to the distribution of the cutting edge. The cutting edge is connected to the outer edge of the peripheral surface, and a bottom mounting surface 5 is provided on the opposite side of the cutting edge, which is connected to the peripheral surface.

[0035] In this embodiment, the peripheral side surface on the blade body 1 forms the flank face, which includes the outer cutting edge flank face 11 and the inner cutting edge flank face 12. The flank face adopts a double gradient design, with the outer cutting edge flank face 11 having a 15° clearance angle and the inner cutting edge flank face 12 having a 10° clearance angle, transitioning through a 0.5mm arc surface 13.

[0036] The cutting tool is made of gradient carbide with a nano-coating. This structure achieves C-shaped short chips when machining 45# steel, increasing the chip breaking rate by 40%.

[0037] Example 3

[0038] like Figure 1 As shown, a U-shaped drill bit includes a bit body 1, which includes a cutting edge with an inclined angle. The cutting edge of the cutting edge is serrated and is located on the outer side of the bit body 1. The cutting edges are connected by a fillet 8 at the tip. The cutting edge includes an outer cutting edge 2 and an inner cutting edge 3, which are connected by an arc-shaped edge 7. The bit body also includes multiple peripheral surfaces and chip breaker 4. The chip breaker 4 are evenly arranged on the bit body 1 near the cutting edge, and the distribution shape of the chip breaker 4 corresponds to the distribution of the cutting edge. The cutting edge is connected to the outer edge of the peripheral surface, and a bottom mounting surface 5 is provided on the opposite side of the cutting edge, which is connected to the peripheral surface.

[0039] In this embodiment, the insert body 1 adopts a triangular symmetrical structure design, with each side equipped with a double-cascaded chip breaker 4: a main chip breaker 4 (1.2mm spacing, 10° long bevel / 35° short bevel) and an auxiliary micro-tooth structure (0.3mm spacing, 15° long bevel / 45° short bevel). The outer cutting edge 2 adopts a wavy serrated edge with an amplitude of 0.05mm and a wavelength of 0.3mm. The flank face innovatively adopts a stepped load-reducing structure, with the flank face 11 of the outer cutting edge containing three 0.02mm height difference steps, and the flank face 12 of the inner cutting edge equipped with a vibration-damping groove (0.1mm deep, 0.5mm wide). The insert mounting surface is designed with a wedge-shaped positioning groove (55° angle), which works in conjunction with the hydraulic clamping system of the tool holder. Silicon carbide whisker-reinforced ceramic matrix composite material is used, suitable for machining high-temperature alloys (such as Inconel 718), and can still maintain effective chip breaking under interrupted cutting conditions.

[0040] Obviously, the above-described embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A U-drill insert comprising an insert body, characterized in that, The blade body comprises cutting edges with an inclination angle, the cutting edges have jagged edges, the cutting edges are arranged on the outer side of the blade body, and the cutting edges are connected by a tip round corner transition; the cutting edges comprise outer cutting edges and inner cutting edges, the outer cutting edges and the inner cutting edges are connected by an arc edge; a plurality of peripheral side surfaces and chip breakers are further included, the chip breakers are uniformly arranged on the blade body close to the cutting edges, and the distribution shape of the chip breakers corresponds to the distribution of the cutting edges; the cutting edges are connected with the outer edge of the peripheral side surface, and the opposite side of the cutting edge is provided with a bottom mounting surface connected with the peripheral side surface.

2. A U-bit insert according to claim 1, characterized in that The blade body is a polygonal structure, and a screw hole is arranged at the center of the blade body.

3. A U-bit insert according to claim 1, characterized in that The chip breakers are continuous sickle jagged structures.

4. A U-bit insert according to claim 3, characterized in that The size between the same positions on adjacent chip breakers is 1 mm.

5. A U drill insert according to claim 4, characterized in that The chip breakers comprise long inclined surfaces and short inclined surfaces, the long inclined surfaces and the short inclined surfaces are inclined in opposite directions to form a jagged structure.

6. A U-bit gage blade according to claim 5, wherein, The distance between the adjacent two intersection points of the long inclined surface and the short inclined surface in the vertical direction is 0.08 mm.

7. A U-bit gage blade according to claim 5 wherein, The included angle between the long inclined surface and the short inclined surface is obtuse.

8. A U-bit gage blade according to claim 7, characterized in that The included angle α between the long inclined surface and the horizontal plane is 6°, and the included angle β between the short inclined surface and the horizontal plane is 30°.

9. The U-bit cutter according to claim 1, wherein The outer cutting edges and the inner cutting edges are each provided with three groups, and the outer cutting edges, the arc edges, the inner cutting edges and the tip round corners are sequentially connected in the clockwise direction.

10. The U-bit cutter according to claim 1, wherein The peripheral side surface on the blade body constitutes a relief surface, the relief surface comprises outer cutting edge relief surfaces and inner cutting edge relief surfaces, and the outer cutting edge relief surfaces and the inner cutting edge relief surfaces are connected by an arc surface transition.

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