Quick feed drill tip

Abstract

The utility model relates to a quick feeding drill point which is a rotary body which is centrosymmetric about an axis Z, a spiral groove which is arranged at a spiral angle is used as a chip groove, an outer enveloping entity of the chip groove is a cutter back, the upper portion of the chip groove is a cutting portion, a first cutter face and a second cutter face are formed on the cutter back in a cutting mode, and an intersecting line of the first cutter face and the second cutter face is a back line. The intersecting line of the first tool faces and the chip grooves is a space curve and forms a main cutting edge, the main cutting edge extends in the direction of the axis Z and is provided with an inner cutting edge, the main cutting edge and the inner cutting edge are connected through a transition edge, and the intersecting line formed by the two symmetrical first tool faces is a chisel edge. The chisel edge is scientifically designed, the strength is obviously improved, and the cutting capacity near the chisel edge is improved; the size of the redesigned chisel edge is slightly changed in the subsequent procedure of mass production, the chisel edge stability and the chisel edge reliability of a finished product are greatly improved, and the method is suitable for continuous and stable production of mass drill bit products.

Description

Technical Field

[0001] The utility model relates to a fast-feed drill tip, belonging to the technical field of mechanical processing and cutting tools. Background Art

[0002] Due to the technological progress of cutting machine tools, five-axis CNC machine tools have been rapidly popularized. In the drilling processing of five-axis CNC machine tools, higher requirements are put forward for efficient processing. Specifically, it is manifested in the following aspects: 1) Efficient processing is reflected in high-speed feed, which is often more than twice as high as in the past; 2) Since five-axis machine tools usually use one clamping to complete as many processing tasks as possible, it is often necessary to complete four or five-sided processing, which makes it increasingly unacceptable for the drill bit to break or break during the drilling process, and puts higher requirements on the high stability of the drill bit; 3) In the five-axis process, the traditional "roughing-heat treatment-finishing" process path is abandoned, and the "heat treatment-semi-finishing / finishing" method is more used, which reduces the process transfer, but also makes the drilling more oriented to high-hardness workpiece materials. Therefore, it is particularly urgent to design a new type of fast-feed drill that can face high-hardness materials. Utility Model Content

[0003] The utility model aims to overcome the shortcomings of the prior art and provide a fast-feed drill tip.

[0004] The purpose of the utility model is achieved through the following technical solutions:

[0005] The rapid feed drill tip is characterized in that the drill tip is a rotating body that is centrally symmetrical about the axis Z, the spiral groove set at a spiral angle is the chip groove, the outer envelope entity of the chip groove is the knife back, the upper part is the cutting part, the knife back is cut to form the first knife face and the second knife face, the intersection line of the first knife face and the second knife face is the back line, the intersection line of the first knife face and the chip groove is a spatial curve, forming a main cutting edge, the main cutting edge extends in the direction of the axis Z, an inner cutting edge is provided, the main cutting edge and the inner cutting edge are connected by a transition edge, and the intersection line formed by the two symmetrical first knife faces is the transverse edge.

[0006] Furthermore, in the above-mentioned fast feed drill tip, a third cutting surface is provided on the right side of the inner cutting edge and the transition edge, the intersection of the second cutting surface and the third cutting surface forms a horizontal reference line, and the inner cutting edge and the horizontal reference line form a spatial angle α in a direction perpendicular to the axis Z.

[0007] Furthermore, in the above-mentioned fast feed drill tip, the angle α is 75° to 100°.

[0008] Furthermore, in the above-mentioned fast feed drill tip, the inner cutting edge, the transition edge and the third cutting surface form a semi-enclosed space, and the semi-enclosed space partially overlaps with the chip groove space to discharge the extruded chips generated by the transverse edge and the chips generated by the inner cutting edge.

[0009] Furthermore, in the above-mentioned rapid feed drill tip, an offset C between the inner cutting edge and the axial plane is negative.

[0010] Furthermore, in the above-mentioned rapid feed drill tip, an offset B between the horizontal reference line and the axial plane is in a positive direction.

[0011] Furthermore, in the above-mentioned rapid feed drill tip, the angle β of the third cutting surface is 55° to 90°.

[0012] Compared with the prior art, the present invention has significant advantages and beneficial effects, which are specifically embodied in the following aspects:

[0013] ① The utility model scientifically designs the chisel edge, significantly improves the strength, and improves the cutting ability near the chisel edge; the subsequent process of mass production rarely changes the size of the redesigned chisel edge, and the chisel edge stability and reliability of the finished product are greatly improved, which is suitable for the continuous and stable production of large-scale drill products and is extremely beneficial to improving product quality;

[0014] ②The change of drill tip structure is more suitable for post-processing of high-hardness workpiece materials, reducing the number of steps and improving processing efficiency;

[0015] ③ The fast feed drill tip is used as the working part of the drill bit. It is applied to solid carbide twist drill bits, high-speed steel twist drill bits, and can also be applied to "interchangeable head" type combined drill bits, which can better meet the high-speed processing requirements of new five-axis machining centers.

[0016] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by implementing the specific implementation of the utility model. The purpose and other advantages of the utility model can be achieved and obtained by the structures specifically pointed out in the written description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 : Axonometric diagram of the drill tip of the utility model;

[0019] Figure 2 : A top view of the drill tip of the utility model;

[0020] Figure 3: A partial enlarged schematic diagram of the drill tip of the utility model;

[0021] Figure 4 : Figure 3 Schematic diagram of PP cross-section. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. The components of the embodiments of the utility model generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the utility model claimed for protection, but merely represents the selected embodiments of the utility model. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the utility model.

[0023] It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. At the same time, in the description of the utility model, directional terms and order terms are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0024] like Figures 1 to 4 As shown, the rapid feed drill tip is a body of revolution that is centrally symmetrical about the axis Z. The drawings and descriptions are defined and described according to the single-sided structure. The spiral groove set at a spiral angle is the chip groove 1, and the outer envelope entity of the chip groove 1 is the blade back 2. The upper part is provided with a cutting portion, which is an important structure for the drill tip to form cutting ability; at the upper end of the blade back 2, the blade back 2 is cut at a certain angle such as 6 to 12° to form a first blade face 3, and the blade back 2 is cut at a larger angle such as 18 to 30° on the first blade face 3 to form a second blade face 4. The intersection of the first blade face 3 and the second blade face 4 is the back line 5, and the intersection of the first blade face 3 and the chip groove 1 is a spatial curve, forming a main cutting edge 6. The main cutting edge 6 extends in the direction of the axis Z and is provided with an inner cutting edge 7. The main cutting edge 6 and the inner cutting edge 7 are connected by a transition edge 8. The intersection of the two symmetrical first blade faces 3 is a transverse edge 9, which plays a role in centering and squeezing the workpiece during the drilling process. The strength of the transverse edge 9 is crucial to the reliability and stability of the drill bit.

[0025] A third cutting surface 10 is provided on the right side of the inner cutting edge 7 and the transition edge 8. The intersection line of the second cutting surface 4 and the third cutting surface 10 forms a horizontal reference line 11. The inner cutting edge 7 and the horizontal reference line 11 form a spatial angle α in a direction perpendicular to the axis Z, and the angle α is 75° to 100°.

[0026] The inner cutting edge 7 , the transition edge 8 and the third cutting surface 10 form a semi-enclosed space, which partially overlaps with the space of the chip discharge groove 1 , so as to smoothly discharge the extruded chips generated by the chisel edge 9 and the chips generated by the inner cutting edge 7 .

[0027] The offset C of the inner cutting edge 7 from the axial plane is in a negative leftward direction. The offset B of the horizontal reference line 11 from the axial plane is in a positive downward direction.

[0028] The chisel edge 9 is relatively weak in the cross section of the PP plane, that is, in the up-down direction, and the angle β of the third blade surface 10 is 55° to 90°, while the angle of the traditional drill tip is 0° to -3°, which greatly improves the strength.

[0029] In summary, the utility model scientifically designs the chisel edge, significantly improves the strength, and improves the cutting ability near the chisel edge; the subsequent process of mass production rarely changes the size of the redesigned chisel edge, and the chisel edge stability and reliability of the finished product are greatly improved, which is suitable for the continuous and stable production of large-scale drill products and is extremely beneficial to improving product quality;

[0030] The change of drill tip structure is more suitable for post-processing of high-hardness workpiece materials, reducing the number of steps and improving processing efficiency;

[0031] The fast feed drill tip, as the working part of the drill bit, is applied to solid carbide twist drill bits, high-speed steel twist drill bits, and can also be applied to "interchangeable head" type combined drill bits, which can better meet the high-speed processing requirements of new five-axis machining centers.

[0032] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model may have various modifications and changes. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model. It should be noted that similar numbers and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0033] The above is only a specific implementation of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention.

[0034] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

Claims

1. Rapid feed drill tip, characterized by: The drill tip is a rotating body that is centrally symmetrical about an axis Z. A spiral groove arranged at a spiral angle is a chip groove (1). The outer envelope entity of the chip groove (1) is a knife back (2). The upper part is a cutting part. The knife back (2) is cut to form a first knife face (3) and a second knife face (4). The intersection line of the first knife face (3) and the second knife face (4) is a back line (5). The intersection line of the first knife face (3) and the chip groove (1) is a space curve to form a main cutting edge (6). The main cutting edge (6) extends in the direction of the axis Z and is provided with an inner cutting edge (7). The main cutting edge (6) and the inner cutting edge (7) are connected by a transition edge (8). The intersection line formed by two symmetrical first knife faces (3) is a chisel edge (9).

2. The fast feed drill tip according to claim 1, characterized in that: A third blade surface (10) is provided on the right side of the inner cutting edge (7) and the transition edge (8); an intersection line of the second blade surface (4) and the third blade surface (10) forms a horizontal reference line (11); and the inner cutting edge (7) and the horizontal reference line (11) form a spatial angle α in a direction perpendicular to the axis Z.

3. The fast feed drill tip according to claim 2, characterized in that: The angle α is 75° to 100°.

4. The fast feed drill tip according to claim 1, characterized in that: The inner cutting edge (7), the transition edge (8) and the third cutting surface (10) form a semi-enclosed space, which partially overlaps with the space of the chip removal groove (1) and is used to discharge the extruded chips generated by the transverse edge (9) and the chips generated by the inner cutting edge (7).

5. The fast feed drill tip according to claim 1, characterized in that: The offset C between the inner cutting edge (7) and the axial plane is negative.

6. The fast feed drill tip according to claim 1, characterized in that: The horizontal reference line (11) is offset from the axial plane by a distance B in a positive direction.

7. The fast feed drill tip according to claim 1, characterized in that: The included angle β of the third blade surface (10) is 55° to 90°.

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