Diamond miniature deep hole drilling tool for silicon carbide

Abstract

The utility model discloses a diamond miniature deep hole drilling cutter for silicon carbide, which belongs to the technical field of drilling cutters and comprises a cutter handle, and a drilling portion spirally extends from the top of the cutter handle. The drilling part comprises a clearance neck part on the outer side, and a chip groove is formed in the inner side of the clearance neck part; the spiral chip groove part is made of hard alloy materials, a drill tip is arranged at the top of the spiral chip groove part, and a plurality of cutting edges are arranged on the drill tip part and intersect in a nonlinear mode. The drill bit is made of diamond, and the length of a drill point machining part is 2-4 times of the length of a blade diameter. The tool can machine a silicon carbide material with the Moh's hardness of 9.0-9.5, the machining capacity of the tool is effectively enhanced, the radial counter-acting force brought by drilling and vibration brought by co-frequency resonance are reduced through the multiple non-linear intersecting cutting edges, the machining precision and the surface quality can be improved easily, the risk of edge breaking is reduced, and the machining efficiency of the tool is improved. Stability and reliability during drilling are ensured, durability of the cutter is improved, and the service life of the cutter is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of drilling tools, in particular to a diamond micro deep hole drilling tool for silicon carbide. Background Art

[0002] Micro deep hole drilling tools are widely used and are often used for processing micro holes in optical precision parts, microelectronic devices, medical instruments, etc. made of semiconductor materials such as single crystal silicon, silicon carbide, ceramics, etc. Micro hole drilling tools refer to drill bits with a blade diameter less than or equal to ￠3.0mm. They can perform deep hole processing in a very small space and maintain high precision and surface quality. Therefore, they play an important role in modern manufacturing.

[0003] In the related technology, commonly used cutting tools include high-speed steel cutting tools, carbide coated cutting tools, metal ceramic cutting tools, etc. The materials of these cutting tools are usually of low hardness and can be used to process materials with low Mohs hardness. However, silicon carbide material has a higher hardness, with a Mohs hardness of 9.0-9.5. Ordinary cutting tools are prone to blade breakage and tool breakage when processing silicon carbide. The processing capacity is low and the service life of the drill bit cannot be guaranteed. In addition, drilling tools with ordinary structures do not optimize the transverse edge structure, do not play a good centering role, cannot meet the actual required tolerances for product processing, and have low product processing accuracy. Utility Model Content

[0004] The purpose of the utility model is to provide a diamond micro deep hole drilling tool for silicon carbide to solve at least one aspect of the problems and defects raised in the above background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A diamond micro deep hole drilling tool for silicon carbide, comprising:

[0007] A tool handle, wherein a drilling portion is spirally extended from the top of the tool handle;

[0008] The drilling part comprises an outer clearance neck, and a chip removal groove is arranged inside the clearance neck;

[0009] The drilling part is made of cemented carbide, a drill bit is arranged on the top thereof, and a plurality of cutting edges are included along the drill bit, and the plurality of cutting edges are nonlinearly intersecting;

[0010] The drill bit is made of diamond material, and the length of the drill bit is 2-4 times the length of the blade diameter.

[0011] The diamond micro deep hole drilling tool for silicon carbide according to this solution has at least the following technical effects:

[0012] The diamond micro deep hole drilling tool for silicon carbide has a drill bit made of diamond material, and the length of the drill bit is 2-4 times the length of the blade diameter, so that the tool can process silicon carbide materials with a Mohs hardness of 9.0-9.5, effectively enhancing the processing capability of the tool. Through a number of nonlinearly intersecting cutting edges, during the processing, the several cutting edges are not drilled on the same straight line, reducing the radial reaction force caused by drilling and the vibration caused by the same frequency resonance, which helps to improve the processing accuracy and surface quality, reduce the instability in the processing process, reduce the risk of broken blades, ensure the stability and reliability during drilling, and improve the durability and service life of the tool.

[0013] As a further solution of the utility model: the drill bit tip is formed with a chisel edge, and the chisel edge is a straight line.

[0014] Since a chisel edge is formed at the center of the drill tip, the chisel edge is straight, so that the tip of the drill bit is divided into two cutting surfaces. The two cutting surfaces intersect on a straight line during drilling. During the processing, only one straight line contacts the material being processed, reducing the contact area between the drill tip and the material. This reduces the axial cutting resistance and can play a good centering role, thereby ensuring a better straightness tolerance of the drilled hole.

[0015] As a further solution of the utility model: a supporting part is arranged between the tool handle and the drilling part.

[0016] As a further solution of the utility model: the side wall of the support portion is arc-shaped, and the arc-shaped side wall is tangent to the air avoidance diameter line.

[0017] Since a support portion is provided between the tool handle and the drilling portion, the side wall of the support portion is in an arc shape, and the arc-shaped side wall is tangent to the clearance diameter line, when the drill tip is subjected to the axial force during processing and the force is transmitted in the reverse direction, the vibration is gradually weakened by gradually increasing the rigidity, ensuring that the drill bit will not break or the blade will not break when drilling holes, achieving more stable processing, and improving the overall rigidity and drilling stability of the tool.

[0018] As a further solution of the utility model: the diameter of the clearance neck is 0.01mm-0.1mm smaller than the blade diameter.

[0019] The avoidance neck does not participate in drilling and does not contact the machined surface hole wall. The diameter of the avoidance neck is 0.01mm to 0.1mm smaller than the blade diameter, so that the avoidance neck can enhance the rigidity and strength of the cutting edge, avoid the tool from swinging or jumping due to the high-speed rotation of the machine tool spindle during processing, and improve the stability and reliability of the tool.

[0020] As a further solution of the utility model: the roughness Ra of the chip groove is 0.1μm-0.4μm.

[0021] The chip groove is polished by a grinding wheel with particles of D10 or less, and has a smooth surface, so that the roughness Ra of the chip groove is 0.1μm-0.4μm, which can ensure the smoothness of the chip removal process, avoid blockage caused by chips generated by cutting, and ensure the continuity and efficiency of the processing process; and the smooth chip groove surface is conducive to the flow of coolant, helps to improve the cooling effect, and effectively reduces the temperature of the tool during the processing; at the same time, the smooth chip groove surface can maintain the stability of the tool during drilling, which helps to improve the processing accuracy.

[0022] As a further solution of the utility model: the width of the chip removal groove increases from small to large in the direction from the drill tip to the cutting part.

[0023] Since the width of the chip groove increases from small to large from the drill tip to the cutting part, it can help the chips to be discharged more smoothly to the outside of the cutting area, avoiding blockage or tool jamming during the processing due to poor chip removal, further ensuring the continuity and efficiency of the processing; and it is conducive to the flow of coolant, effectively reducing the temperature of the tool during the processing, and further improving the cooling effect of the tool.

[0024] As a further solution of the utility model: the cutting edge is a cylindrical edge band and is formed with an inverted cone, and the width of the edge band of the cutting edge is 9%-11% of the edge diameter.

[0025] Since the cutting edge is a cylindrical edge band and has a reverse cone, the edge band width of the cutting edge is 9%-11% of the edge diameter, which can effectively support the cylindrical edge band, and the reverse cone of the edge band can reduce the contact with the hole wall, thereby reducing the friction with the hole wall and improving the durability and service life of the cutting edge.

[0026] As a further solution of the utility model: the drilling portion and the drill bit are connected by silver soldering.

[0027] Since the drilling part and the drill bit are connected by silver welding, the contact surface of the diamond rod and the cemented carbide rod is fully coated with silver solder paste, and the temperature is controlled at 200℃ to evaporate the moisture therein to fix it, and then it enters the vacuum welding furnace for welding, and the temperature is cooled after welding; it helps to improve the welding strength and bending strength of the drilling part and the drill bit, and no cold solder joints are generated, so that the tool can withstand the vibration caused by processing, avoid tool breakage, and improve the reliability and service life of the tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to facilitate understanding by those skilled in the art, the present invention is further described below in conjunction with the accompanying drawings.

[0029] Figure 1 This is a schematic diagram of the structure of a diamond micro deep hole drilling tool for silicon carbide;

[0030] Figure 2 The diagram is a schematic diagram of the drill tip structure of a diamond micro deep hole drilling tool for silicon carbide.

[0031] Reference numerals:

[0032] 101. Tool handle; 102. Drilling part; 103. Clearance neck; 104. Chip groove; 105. Drill bit; 106. Cutting edge; 107. Chisel edge; 108. Support part. DETAILED DESCRIPTION

[0033] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0034] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0035] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0036] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0037] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model, that is, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the utility model provided in the accompanying drawings is not intended to limit the scope of the utility model claimed for protection, but merely represents 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 creative work are within the scope of protection of the utility model.

[0039] like Figure 1 and Figure 2 The utility model embodiment shown is a diamond micro deep hole drilling tool for silicon carbide, comprising: a tool handle 101, a drilling portion 102 spirally extending from the top of the tool handle 101; the drilling portion 102 includes an outer air avoidance neck 103, and a chip groove 104 is arranged on the inner side of the air avoidance neck 103; the drilling portion 102 is made of cemented carbide, and a drill bit 105 is arranged on the top thereof, and a plurality of cutting edges 106 are included along the drill bit 105, and the plurality of cutting edges 106 are non-linearly intersecting; the drill bit 105 is made of diamond material, and the length of the drill bit 105 is 2-4 times the length of the blade diameter.

[0040] Specifically, the drill bit 105 of the diamond micro deep hole drilling tool for silicon carbide is made of diamond material, and the length of the drill bit 105 is 2-4 times the length of the blade diameter, so that the tool can process silicon carbide materials with a Mohs hardness of 9.0-9.5, effectively enhancing the processing capability of the tool. Through a plurality of nonlinearly intersecting cutting edges 106, during the processing process, the plurality of cutting edges 106 are not drilled on the same straight line, reducing the radial reaction force caused by drilling and the vibration caused by the same frequency resonance, which helps to improve the processing accuracy and surface quality, reduce the instability during the processing, reduce the risk of broken blades, ensure the stability and reliability during drilling, and improve the durability and service life of the tool.

[0041] like Figure 2 As shown, a chisel edge 107 is formed at the tip of the drill bit 105, and the chisel edge 107 is straight.

[0042] Specifically, since a chisel edge 107 is formed at the center of the tip of the drill bit 105, the chisel edge 107 is linear, so that the tip of the drill bit 105 is divided into two cutting surfaces. The two cutting surfaces intersect on a straight line during drilling, and during the processing, only one straight line contacts the material being processed, reducing the contact area between the tip of the drill bit 105 and the material, thereby reducing the axial cutting resistance and having a good centering effect, thereby ensuring a better straightness tolerance of the drilled hole.

[0043] like Figure 1 As shown, a support portion 108 is provided between the tool handle 101 and the drilling portion 102. The side wall of the support portion 108 is arc-shaped, and the arc-shaped side wall is tangent to the clearance diameter line.

[0044] Specifically, since a support portion 108 is provided between the shank 101 and the drilling portion 102, the side wall of the support portion 108 is in an arc shape, and the arc-shaped side wall is tangent to the clearance diameter line, when the tip of the drill bit 105 is subjected to the axial force during processing and is reversely transmitted, the vibration is gradually weakened by gradually increasing rigidity, ensuring that the drill bit 105 will not break or break the blade when drilling holes, achieving more stable processing, and improving the overall rigidity and drilling stability of the tool.

[0045] Furthermore, the diameter of the clearance neck portion 103 is 0.01 mm to 0.1 mm smaller than the blade diameter.

[0046] Specifically, the avoidance neck 103 does not participate in drilling and does not contact the machined surface hole wall, and the diameter of the avoidance neck 103 is 0.01mm to 0.1mm smaller than the blade diameter, so that the avoidance neck 103 can enhance the rigidity and strength of the cutting edge 106, avoid the tool from swinging or jumping due to the high-speed rotation of the machine tool spindle during the processing, and improve the stability and reliability of the tool.

[0047] Furthermore, the roughness Ra of the chip groove 104 is 0.1 μm-0.4 μm.

[0048] Specifically, the chip groove 104 is polished by a grinding wheel with D10 or smaller particles, and has a smooth surface, so that the roughness Ra of the chip groove is 0.1μm-0.4μm, which can ensure the smoothness of the chip removal process, avoid blockage caused by chips generated by cutting, and ensure the continuity and efficiency of the processing process; and the smooth surface of the chip groove 104 is conducive to the flow of coolant, helps to improve the cooling effect, and effectively reduces the temperature of the tool during the processing; at the same time, the smooth surface of the chip groove 104 can maintain the stability of the tool during drilling, which helps to improve the processing accuracy.

[0049] Furthermore, the width of the chip groove 104 increases from small to large in the direction from the drill tip to the cutting part.

[0050] Specifically, since the width of the chip groove 104 increases from the tip of the drill bit 105 to the cutting part 102, it can help the chips to be discharged more smoothly to the outside of the cutting area, avoiding blockage or tool jamming during the processing due to poor chip removal, further ensuring the continuity and efficiency of the processing; and it is conducive to the flow of coolant, effectively reducing the temperature of the tool during the processing, and further improving the cooling effect of the tool.

[0051] According to an embodiment of the present invention, the cutting edge 106 is a cylindrical edge band and is formed with an inverted cone, and the edge band width of the cutting edge 106 is 9%-11% of the edge diameter.

[0052] Since the cutting edge 106 is a cylindrical blade and has an inverted cone, the blade width of the cutting edge 106 is 9%-11% of the blade diameter, which can effectively support the cylindrical blade, and the inverted cone of the blade can reduce the contact with the hole wall, thereby reducing the friction with the hole wall, thereby improving the durability and service life of the cutting edge 106.

[0053] It should be noted that the drilling portion 102 and the drill bit 105 are connected by silver soldering.

[0054] Specifically, since the drilling portion 102 and the drill bit 105 are connected by silver soldering, the contact surface of the diamond rod and the cemented carbide rod is fully coated with silver solder paste, and the temperature is controlled at 200°C to evaporate the moisture therein to fix it, and then it enters a vacuum welding furnace for welding, and is cooled after welding; this helps to improve the welding strength and bending strength of the drilling portion 102 and the drill bit 105, and does not produce cold solder joints, so that the tool can withstand the vibration caused by processing, avoid tool breakage, and improve the reliability and service life of the tool.

[0055] The above contents are merely examples and explanations of the structure of the utility model. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the utility model or exceed the scope defined in the claims, they should all fall within the protection scope of the utility model.

Claims

1. A diamond micro deep hole drilling tool for silicon carbide, characterized in that: include: A tool handle (101), wherein a drilling portion (102) is spirally extended from the top of the tool handle (101); The drilling portion (102) comprises an outer clearance neck (103), and a chip removal groove (104) is arranged inside the clearance neck (103); The drilling portion (102) is made of hard alloy, and a drill bit (105) is arranged on the top thereof. A plurality of cutting edges (106) are included along the drill bit (105), and the plurality of cutting edges (106) intersect nonlinearly; The drill bit (105) is made of diamond, and the length of the drill bit (105) is 2-4 times the length of the blade diameter.

2. The diamond micro deep hole drilling tool for silicon carbide according to claim 1, characterized in that: The tip of the drill bit (105) is formed with a chisel edge (107), and the chisel edge (107) is straight.

3. The diamond micro deep hole drilling tool for silicon carbide according to claim 1, characterized in that: A supporting portion (108) is provided between the tool handle (101) and the drilling portion (102).

4. The diamond micro deep hole drilling tool for silicon carbide according to claim 3, characterized in that: The side wall of the support portion (108) is in an arc shape, and the arc-shaped side wall is tangent to the clearance diameter line.

5. The diamond micro deep hole drilling tool for silicon carbide according to claim 1, characterized in that: The diameter of the clearance neck (103) is 0.01 mm to 0.1 mm smaller than the blade diameter.

6. The diamond micro deep hole drilling tool for silicon carbide according to claim 1, characterized in that: The roughness Ra of the chip removal groove (104) is 0.1 μm-0.4 μm.

7. The diamond micro deep hole drilling tool for silicon carbide according to claim 6, characterized in that: The width of the chip removal groove (104) increases from small to large in the direction from the drill tip to the cutting part.

8. The diamond micro deep hole drilling tool for silicon carbide according to claim 1, characterized in that: The cutting edge (106) is a cylindrical edge band and is formed with an inverted cone. The edge band width of the cutting edge (106) is 9%-11% of the edge diameter.

9. The diamond micro deep hole drilling tool for silicon carbide according to any one of claims 1 to 8, characterized in that: The drilling portion (102) and the drill bit (105) are connected by silver soldering.

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