Drilling blade

Abstract

The utility model provides a drilling blade which is characterized in that the top of the blade is provided with a front blade face, a plurality of rear blade faces are evenly distributed on the side face of the blade in the circumferential direction, every two adjacent rear blade faces are connected with each other, intersecting lines of the front blade face and all the rear blade faces are cutting edges, each cutting edge is provided with a corresponding chip rolling groove on the front blade face, and the chip rolling grooves are formed in the front blade face. And all the chip rolling grooves are sequentially connected and communicated. Compared with the prior art, the drilling blade has the advantages that the through chip rolling grooves are matched with the cutting edges, the technical problem that an existing drilling blade is poor in chip removal capacity is solved, and built-up edges are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a drilling tool technical field especially relates to a drilling blade. BACKGROUND

[0002] The shallow hole drill is a kind of indexable blade for the hole machining of the medium diameter with the depth-diameter ratio of 3-5.The indexable shallow hole drill made by selecting the blade of suitable material and geometry can work in high speed and high temperature environment, thereby greatly improving the drilling efficiency, improving the hole machining quality, and reducing the blade cost.

[0003] But because the process of drilling shallow hole is to produce hole, so its chip removal capacity is relatively poor compared with milling blade, and poor chip removal capacity can cause built-up edge, and further affect the machining surface. SUMMARY

[0004] In view of the deficiencies in the prior art, the utility model provides a drilling blade, which solves the technical problem of poor chip removal capacity of the existing drilling blade.

[0005] According to the drilling blade of the embodiment of the utility model, the blade top is provided with a rake face, the blade side is circumferentially uniformly provided with a plurality of relief faces, adjacent relief faces are connected with each other, the intersection line of the rake face and all relief faces is a cutting edge, each cutting edge is provided with a corresponding chip flute on the rake face, and all chip flutes are sequentially connected and penetrated.

[0006] The technical principle of the utility model is as follows: because all chip flutes are penetrated, therefore, during cutting, the iron chips generated at any position of the blade can be quickly discharged through the chip flutes.

[0007] Compared with the prior art, the utility model has the following beneficial effects: through the penetration of chip flutes and the cooperation of cutting edges, the technical problem of poor chip removal capacity of the existing drilling blade is solved, and the generation of built-up edge is reduced.

[0008] Further, the blade side is also circumferentially uniformly provided with a plurality of side positioning faces, adjacent side positioning faces are connected with each other, each side positioning face is connected with a relief face, and the included angle between the rake face and the relief face is larger than the included angle between the rake face and the side positioning face.

[0009] By setting two different angles, the included angle between the rake face and the relief face is large, which is used to provide high stability and strength, to ensure that the blade can stably perform powerful cutting, and the included angle between the rake face and the side positioning face is large, which is used to improve the chip removal efficiency.

[0010] Further, the included angle between the rake face and the rear face is 75°±0.5°, and the horizontal height of the rear face is 1.5mm±0.15mm.

[0011] Further, the included angle between the rake face and the side positioning face is 70°±0.5°.

[0012] Further, the circular arc transition surface is arranged between the adjacent rear faces and the adjacent side positioning faces, and the intersection line between the circular arc transition surface and the rake face is also a cutting edge.

[0013] Further, the chip winder groove is provided with an inclined surface close to the rake face and a circular arc surface away from the rake face, and the inclined surface and the circular arc surface are connected through a circular arc transition.

[0014] The structure that the chip winder groove is provided with the inclined surface and the circular arc surface is helpful for chip winding and chip breaking.

[0015] Further, the included angle between the inclined surface and the rake face is 20°±0.5°.

[0016] Further, the top center of the blade is provided with a convex part, the upper surface of the convex part is an upper positioning face, the horizontal height of the upper positioning face is higher than that of the rake face, and the circular arc surface and the upper positioning face are connected through a circular arc transition.

[0017] Further, the bottom center of the blade is provided with a boss, the lower surface of the boss is a lower positioning face, the center of the blade is provided with a countersunk screw hole penetrating through the convex part and the boss, and the large end of the countersunk screw hole is arranged close to the convex part.

[0018] Through the cooperation of the upper positioning face and the lower positioning face, the blade can be stably fixed on the blade rod.

[0019] Further, the rake face is a square plane. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a three-dimensional structure schematic view of the drill bit of the embodiment of the utility model.

[0021] Figure 2 It is a front view of the drill bit of the embodiment of the utility model.

[0022] Figure 3 It is a bottom view of the drill bit of the embodiment of the utility model.

[0023] Figure 4 It is a structure schematic view of the chip winder groove of the embodiment of the utility model.

[0024] In the above figures: 10, rake face; 11, cutting edge; 20, flank face; 21, arc transition surface; 30, side positioning surface; 40, chip groove; 41, inclined surface; 42, arc surface; 50, protrusion; 51, upper positioning surface; 60, boss; 61, lower positioning surface; 70, countersunk screw hole. Detailed Implementation

[0025] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0026] like Figures 1-2 The drilling insert shown has a rake face 10 at the top, which is a square plane. Several flank faces 20 are evenly distributed around the side of the insert, and adjacent flank faces 20 are connected to each other. The intersection line between the rake face 10 and all the flank faces 20 is the cutting edge 11. Several side positioning surfaces 30 are also evenly distributed around the side of the insert, and adjacent side positioning surfaces 30 are connected to each other. Each side positioning surface 30 is connected to a flank face 20, forming the side structure of the insert.

[0027] like Figure 2 As shown, the angle between the rake face 10 and the flank face 20 is greater than the angle between the rake face 10 and the side locating surface 30. This ensures the strength of the cutting edge 11 while improving chip removal and heat dissipation capabilities, resulting in excellent tool life. Specifically, the angle between the rake face 10 and the flank face 20 is 75°±5°, the angle between the rake face 10 and the side locating surface 30 is 70°±0.5°, and the horizontal height of the flank face 20 is 1.5mm±0.15mm. These specific values ​​of angle and height allow the cutting performance of the tool to reach its optimal level, reducing the machining time by 5%-10% and greatly improving machining efficiency.

[0028] like Figure 1 As shown, there is an arc transition surface 21 between adjacent back face 20 and between adjacent side positioning surface 30. The intersection line of the arc transition surface 21 and the front face 10 is also the cutting edge 11, which avoids the problem that the intersection area of ​​the two intersecting cutting edges 11 is easy to break during cutting.

[0029] like Figure 1 , 4As shown, each cutting edge 11 has a corresponding chip-rolling groove 40 on the rake face 10. All chip-rolling grooves 40 are connected in sequence. The side of the chip-rolling groove 40 closest to the rake face 10 is an inclined surface 41, and the side of the chip-rolling groove 40 furthest from the rake face 10 is an arc surface 42. The inclined surface 41 and the arc surface 42 are connected by an arc transition. Specifically, the angle between the inclined surface 41 and the rake face 10 is 20°±0.5°. When the chip is cut off by the cutting edge 11, it will enter the chip-rolling groove 40. At this time, the chip will move along the inclined surface 41. When it comes into contact with the arc surface 42, it will curl along the arc surface and break off with the chip at the inclined surface 41 to form small chip particles, which are then discharged.

[0030] like Figures 1-3 As shown, a protrusion 50 is integrally formed at the center of the top of the blade. The upper surface of the protrusion 50 is the upper positioning surface 51. The horizontal height of the upper positioning surface 51 is higher than that of the front cutting face 10. The arc surface 42 is connected to the upper positioning surface 51 by an arc transition. A boss 60 is integrally formed at the center of the bottom of the blade. The lower surface of the boss 60 is the lower positioning surface 61. A countersunk screw hole 70 is provided at the center of the blade, which passes through the protrusion 50 and the boss 60. The larger end of the countersunk screw hole 70 is located on the side close to the protrusion 50, so that the blade can be fixed to the tool holder with screws.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A drilling tool, characterized in that: The top of the blade is designated as the rake face, and several flank faces are evenly distributed around the side of the blade. Adjacent flank faces are connected to each other. The intersection lines of the rake face and all flank faces are cutting edges. Each cutting edge has a corresponding chip groove on the rake face, and all chip grooves are connected and intersected in sequence.

2. A drilling tool as described in claim 1, characterized in that: The blade also has several side positioning surfaces evenly distributed circumferentially on its side. Adjacent side positioning surfaces are connected to each other. Each side positioning surface is connected to a rear cutting face. The angle between the front cutting face and the rear cutting face is greater than the angle between the front cutting face and the side positioning surface.

3. A drilling tool as described in claim 2, characterized in that: The angle between the front and rear cutting faces is 75°±0.5°, and the horizontal height of the rear cutting face is 1.5mm±0.15mm.

4. A drilling tool as described in claim 2, characterized in that: The angle between the rake face and the side positioning face is 70°±0.5°.

5. A drilling tool as described in claim 2, characterized in that: An arc transition surface is provided between adjacent back facets and between adjacent side positioning surfaces, and the intersection line of the arc transition surface and the front facet is also the cutting edge.

6. A drilling tool as described in claim 1, characterized in that: The chip groove is inclined on the side near the rake face and curved on the side away from the rake face, with a curved transition between the inclined and curved surfaces.

7. A drilling tool as described in claim 6, characterized in that: The angle between the inclined surface and the rake face is 20°±0.5°.

8. A drilling tool as described in claim 6, characterized in that: The blade has a protrusion at the center of its top, and the upper surface of the protrusion is an upper positioning surface. The upper positioning surface is horizontally higher than the front blade surface, and the arc surface is connected to the upper positioning surface by an arc transition.

9. A drilling tool as described in claim 6, characterized in that: The blade has a boss at the bottom center, the lower surface of the boss is a lower positioning surface, and the blade has a countersunk screw hole at the center that passes through the protrusion and the boss. The larger end of the countersunk screw hole is located on the side near the protrusion.

10. A drilling insert as described in any one of claims 1-9, characterized in that: The rake face is a square plane.

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