Powder high-speed steel drill bit with special drill point angle

Abstract

The utility model discloses a powder high-speed steel drill bit with a special drill point angle in the technical field of drill bits, which comprises a cutter handle and a cutter head, the cutter head is fixed at one end of the cutter handle, and the cutter head comprises a chisel edge, a first rear cutter face, a main cutting edge, an edge belt, an edge cleaning groove, a second rear cutter face, a chip dividing groove step, a chip dividing groove, two grooves and a drill point angle. The two grooves extend to the tail end of the tool bit, and the first rear tool face and the second rear tool face are both formed in the outer wall of the tool bit. The powder high-speed steel material is used, the content of carbides in the powder high-speed steel greatly exceeds the allowable range of cast high-speed steel, the hardness is improved to HRC67 or above, and therefore the abrasion resistance is further improved, and the powder high-speed steel material has the main advantages of being good in abradability, small in heat treatment deformation, good in hardness uniformity, high in toughness, good in abrasion resistance, long in service life and stable. And a special drill point structure is adopted, so that the rigidity of a tool nose is improved, and a self-centering function is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of drill bits, in particular to a powder high-speed steel drill bit with a special drill tip angle. Background Art

[0002] Generally, high-speed steel drill bits use high-speed steel materials. Due to the slow cooling of the molten metal, uneven segregation of alloys and coarsening of alloy carbides will occur, which will affect the performance of high-speed steel. Since the particle sizes of the high-speed steel carbides are different and unevenly distributed in this kind of high-speed steel material, it causes rapid wear and low life. The drill tip structure is composed of a chisel edge and two cutting edges, with relatively large cutting resistance, and it is easy to occur the phenomena of chipping and breaking of the cutting edge tip, and even breaking of the tool during the hole machining process. There are also drill bits with a structure of grinding the chisel edge. This kind of drill tip structure will cause a certain loss of rigidity in the tip part and reduce the life. Content of the Utility Model

[0003] The purpose of the utility model is to provide a powder high-speed steel drill bit with a special drill tip angle. Through the rapid solidification process of powder high-speed steel, the carbide particles of the powder high-speed steel are finer and more evenly distributed, and the toughness, hardness and mechanical properties are improved compared with general high-speed steel. Coupled with a special drill tip, the performance is further improved to solve the problems that in the above background art, due to the different particle sizes and uneven distribution of the high-speed steel carbides in the high-speed steel material, it causes rapid wear and low life; the drill tip structure is composed of a chisel edge and two cutting edges, with relatively large cutting resistance, and it is easy to occur the phenomena of chipping and breaking of the cutting edge tip, and even breaking of the tool during the hole machining process. There are also drill bits with a structure of grinding the chisel edge. This kind of drill tip structure will cause a certain loss of rigidity in the tip part and reduce the life.

[0004] To achieve the above purpose, the utility model provides the following technical scheme: a powder high-speed steel drill bit with a special drill tip angle, including a tool shank and a tool bit. The tool bit is fixed at one end of the tool shank. The tool bit includes a chisel edge, a first flank face, a main cutting edge, a land, a relief groove, a second flank face, a chip breaker step, a chip breaker, a groove and a drill tip angle. There are two grooves, which are spirally opened on the outer wall of the tool bit. The two grooves extend to the tail end of the tool bit. The first flank face and the second flank face are both opened on the outer wall of the tool bit. The spiral groove intersects with the first flank face to form the main cutting edge. The tool bit forms the land after grinding through two relief grooves and the grooves. The chip breaker forms the chip breaker step with the second flank face.

[0005] As a further scheme of the utility model: a drill tip angle is formed at the arrow end of the tool bit away from the tool shank, and the chisel edge is opened at the intersection of the drill tip center.

[0006] As a further solution of the present utility model: the edge cleaning groove is arranged at the gap between two grooves on the tool tip, and there is a certain angle between the chip breaking groove and the chip breaking groove step.

[0007] As a further solution of the present utility model: the rotation angle of the two grooves is 26° - 32°, the angle of the drill point is 118° - 135°, the axial clearance angle of the first flank is selected as 12°, and the axial angle of the chip breaking groove is selected as 50°.

[0008] As a further solution of the present utility model: the axial included angle of the web is 25° - 30° smaller than that of a conventional high-speed steel drill bit.

[0009] Compared with the prior art, the beneficial effects of the present utility model are as follows: using powder high-speed steel material, the carbide content in the powder high-speed steel greatly exceeds the allowable range of the cast high-speed steel, so that the hardness is increased to above HRC67, thereby further improving the wear resistance. The main advantages are: good grindability, small heat treatment deformation, good hardness uniformity, high toughness, good wear resistance, long and stable service life, and adopting a special drill tip structure, which improves the rigidity of the tool tip and has the function of self-centering. Description of the Drawings

[0010] Figure 1 It is the front view structural schematic diagram of a powder high-speed steel drill bit with a special drill tip angle of the present utility model;

[0011] Figure 2 It is a powder high-speed steel drill bit with a special drill tip angle of the present utility model Figure 1 The enlarged schematic diagram of the structure at A in;

[0012] Figure 3 It is the pointed schematic diagram of the tool tip of the powder high-speed steel drill bit with a special drill tip angle of the present utility model.

[0013] In the figure: 1, web; 2, first flank; 3, main cutting edge; 4, land; 5, edge cleaning groove; 6, second flank; 7, chip breaking groove step; 8, chip breaking groove; 9, groove; 10, shank; 11, drill point angle; 12, tool tip. Detailed Embodiments

[0014] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0015] The terms "first", "second", etc. in the description and claims of this application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of this application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of the same category, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the description and claims means at least one of the connected objects, and the character " / ", generally represents an "or" relationship between the associated objects before and after.

[0016] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0017] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", "setting" should be understood in a broad sense. For example, it can be fixedly connected and set, or detachably connected and set, or integrally connected and set. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0018] Please refer to Figures 1 to 3 In an embodiment of the present utility model, a powder high-speed steel drill bit with a special drill tip angle includes a shank 10 and a cutting head 12. The cutting head 12 is fixed to one end of the shank 10. The cutting head 12 includes a chisel edge (1), a first flank 2, a main cutting edge 3, a land 4, a margin groove 5, a second flank 6, a chip breaker step 7, a chip breaker 8, a groove 9, and an 11° drill point angle. There are two grooves 9, and they are helically formed on the outer wall of the cutting head 12. The two grooves 9 extend to the tail end of the cutting head 12. The first flank 2 and the second flank 6 are both formed on the outer wall of the cutting head 12. The groove 9 intersects with the first flank 2 to form the main cutting edge 3. The cutting head 12 forms the land 4 after being ground by the two margin grooves 5 and the groove 9. The chip breaker 8 and the second flank 6 form the chip breaker step 7.

[0019] An 11° drill point angle is formed at the end of the cutting head 12 away from the shank 10, and the chisel edge 1 is formed at the intersection of the drill tip center.

[0020] The margin groove 5 is arranged at the gap between the two grooves 9 on the cutting head 12, and there is a certain angle between the chip breaker 8 and the chip breaker step 7.

[0021] The rotation angle of the two grooves 9 is 26° to 32°, the angle of the drill point 11 is 118° to 135°, the axial rake angle of the first flank 2 is selected as 12°, the axial angle of the chip breaker groove 8 is selected as 50°, and the axial included angle of the chisel edge 1 is 25° to 30° smaller than that of a conventional high-speed steel drill bit.

[0022] Among them, the powder high-speed steel drill bit uses a powder high-speed steel round bar. The cutting edge of the round bar is spirally extended from the drill tip to the drill tail at an angle of 26° to 32° by two symmetric spiral grooves (9). The spiral groove 9 intersects with the first flank 2 to form the main cutting edge 3. The cylindrical cutting edge forms the cutting edge band 4 after being ground by two margin grooves 5 and the groove 9. The drill point 11 is selected as 118° to 135°, the axial rake angle of the first flank 2 is selected as 12°, the axial angle of the chip breaker groove 8 is selected as 50°, and the chisel edge 1 is formed at the center position of the drill tip. The axial included angle of the chisel edge 1 is 25° to 30° smaller than that of a conventional high-speed steel drill bit, reducing the axial cutting resistance and chip evacuation resistance. The chip breaker groove 8 and the second flank 6 form a chip breaker step 7, ensuring the rigidity of the entire head of the drill tip. The chips generated during machining are broken after curling and hitting the chip breaker step (7), making the chip shape smaller and more conducive to chip evacuation, thereby improving the tool life.

[0023] Implementation solution: Use powder high-speed steel material, machine spiral grooves and drill tips on the cutting edge to form a drill bit with cutting function. In the drill tip part, a special chip breaker groove 8 is ground. This chip breaker groove 8 increases the second flank angle at the position of the chisel edge 1 of the tool face, making the included angle of the chisel edge 1 formed by the intersection of the conventional first flank 2 and the second flank 6 smaller, reducing the axial cutting resistance and chip evacuation resistance, and forming an obvious step in the middle part of the second flank. Without reducing the rigidity of the tool tip, it has the function of chip breaking.

[0024] As an improved solution in this field:

[0025] In order to further improve the wear resistance of the drill bit and reduce the friction coefficient, advanced coating technologies such as titanium nitride, titanium carbide or alumina coatings can be considered to be applied on the surface of the drill bit. Through these coatings, the hardness and heat resistance of the drill bit surface can be significantly improved, the heat generated during high-speed cutting can be reduced, and the tool life can be extended.

[0026] It should be noted that in this text, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the presence of additional identical elements in the process, method, article or device comprising such element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the reverse order according to the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0027] The embodiments of the present application have been described above in conjunction with the accompanying drawings. However, the present application is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Those of ordinary skill in the art, under the inspiration of the present application and without departing from the spirit and scope protected by the claims of the present application, can still make many forms, all of which fall within the protection scope of the present application.

Claims

1. A powder high-speed steel drill bit with a special drill tip angle, comprising a shank (10) and a cutting head (12), characterized in that: The cutting head (12) is fixed to one end of the tool handle (10). The cutting head (12) includes a transverse edge (1), a first flank face (2), a main cutting edge (3), a land (4), a chamfer groove (5), a second flank face (6), a chip breaker groove step (7), a chip breaker groove (8), grooves (9) and (11) a drill point angle. There are two grooves (9), which are helically formed on the outer wall of the cutting head (12). The two grooves (9) extend to the tail end of the cutting head (12). The first flank face (2) and the second flank face (6) are both formed on the outer wall of the cutting head (12). The groove (9) intersects with the first flank face (2) to form the main cutting edge (3). The cutting head (12) forms the land (4) after grinding through two chamfer grooves (5) and the grooves (9). The chip breaker groove (8) and the second flank face (6) form the chip breaker groove step (7). The rotation angle of the two grooves (9) is 26° to 32°. The angle of the drill point angle (11) is 118° to 135°. The axial rake angle of the first flank face (2) is selected as 12°. The axial angle of the chip breaker groove (8) is selected as 50°.

2. The powder high-speed steel drill bit with a special drill tip angle according to claim 1, characterized in that: A drill point angle (11) is formed at one end arrow of the cutting head (12) away from the tool handle (10). The transverse edge (1) is formed at the intersection of the drill tip center.

3. A powder high-speed steel drill bit with a special drill tip angle according to claim 1, characterized in that: The chamfer groove (5) is arranged at the gap between the two grooves (9) on the cutting head (12). There is a certain angle between the chip breaker groove (8) and the chip breaker groove step (7).

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