Burr-free drilling tool

Abstract

The utility model discloses a burr-free drilling tool which comprises a drill tip section, a forming section and a step section, and the drill tip section is located at the end of the burr-free drilling tool. The radial size of the forming section is matched with a to-be-machined hole. The step section is located between the drill tip section and the forming section and comprises a plurality of step structures arranged in a stacked mode, and the radial size of each step structure is gradually increased from the drill tip section to the forming section. Along with rotation of the burr-free drilling tool, the drill tip section, the step section and the forming section sequentially enter the part to be machined, the machining process of a hole to be machined is completed, and the drill tip section is drilled into the part to be machined at a preset position. The step section comprises a plurality of step structures, the friction resistance of the main blade can be shared, the abrasion loss of the main blade is reduced, burrs are reduced, meanwhile, the cutting efficiency of the burr-free drilling tool can be improved, and the service life of the burr-free drilling tool can be prolonged. The radial size of the forming section is matched with the radial size of the to-be-machined hole, and the size precision of the to-be-machined hole is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of machining tools, in particular to a burr-free drilling tool. BACKGROUND

[0002] Drilling is a common processing method in industrial production, but burrs often occur after drilling. The burr at the outlet of the drilling is caused by the deformation and extrusion of the material around the workpiece when the drill bit penetrates out of the workpiece, causing the material around the workpiece to deform, loosen or rise. The existence of burrs not only affects the appearance quality of the product, but also may cause problems to the next process operation.

[0003] Currently, burr control methods such as reducing cutting speed and enhancing sharpness of the cutting edge are commonly used. When the method of reducing cutting speed is used, burr generation can be reduced to some extent, but the production efficiency is low and the production cost is high. When the method of enhancing sharpness of the cutting edge is used, burr generation can also be reduced, but the cutting tool wears too fast, the service life of the cutting tool is not ideal, and the production cost is increased. In addition, a deburring process can be added in the production process, but the increase of this process not only increases the production cost but also greatly reduces the production efficiency, and some special structure products cannot add the deburring process. CONTENT OF THE INVENTION

[0004] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a burr-free drilling tool which can reduce the wear of the main edge of the forming section to reduce the generation of burrs.

[0005] According to the first aspect of the embodiment of the present application, the burr-free drilling tool comprises a drill tip section, a forming section and a stepped section. The drill tip section is at the end of the burr-free drilling tool and is used to drill into the part to be processed. The radial dimension of the forming section matches the radial dimension of the hole to be processed. The stepped section is between the drill tip section and the forming section. The stepped section comprises a plurality of stacked stepped structures, and the radial dimension of each stepped structure gradually increases from the drill tip section to the forming section.

[0006] According to the burr-free drilling tool of the embodiment of the present application, at least the following beneficial effects are achieved: With the rotation of the burr-free drilling tool, the drill tip section, the stepped section and the forming section enter the inside of the part to be processed in turn to complete the processing of the hole to be processed. The drill tip section drills into the part to be processed at a predetermined position to preliminarily position the hole to be processed. The stepped section comprises a plurality of stepped structures which can share the frictional resistance of the main edge to reduce the wear of the main edge and thus reduce the generation of burrs. At the same time, the cutting efficiency and service life of the burr-free drilling tool can be improved. The radial dimension of the forming section matches the radial dimension of the hole to be processed to ensure the dimensional accuracy of the hole to be processed.

[0007] According to some embodiments of the present application, the stepped section comprises a first stepped structure, the first stepped structure comprises a first front blade and a first side blade at an angle to each other, the first front blade is connected to the drill tip section, and the first side blade is at the edge of the first stepped structure.

[0008] According to some embodiments of the present application, a joint position of the first front blade and the first side blade is provided with a first chamfer, the size of the first chamfer is set to 0.1 mm, and the upper and lower deviations are both set to 0.05 mm.

[0009] According to some embodiments of the present application, the stepped section further comprises a second stepped structure, the second stepped structure comprises a second front blade and a second side blade at an angle to each other, the second front blade is connected to the first side blade, and the second side blade is at the edge of the second stepped structure.

[0010] According to some embodiments of the present application, the second side blade comprises a cutting part and a relief part, the cutting part is between the second front blade and the relief part, the relief part is inclined to the middle part of the second stepped structure, and the relief part is set to an angle of 5° to the axial direction of the burr-free drilling tool, so that the relief part avoids the side wall of the to-be-processed hole.

[0011] According to some embodiments of the present application, the cutting part is parallel to the axial direction of the burr-free drilling tool, the length of the cutting part is set to 0.3 mm, and the upper and lower deviations are both set to 0.05 mm.

[0012] According to some embodiments of the present application, a joint position of the cutting part and the second side blade is provided with a second chamfer, the size of the second chamfer is set to 0.1 mm, and the upper and lower deviations are both set to 0.05 mm.

[0013] According to some embodiments of the present application, the stepped section further comprises a third stepped structure, the third stepped structure comprises a main blade and a third side blade at an angle to each other, the main blade is connected to the second side blade, and the third side blade is at the edge of the third stepped structure.

[0014] According to some embodiments of the present application, the main blade is inclined to the direction of the forming section, and the main blade is set to an angle of 3° to the radial direction of the burr-free drilling tool, so that the joint position of the main blade and the third side blade forms a sharp corner protruding from the main blade.

[0015] According to some embodiments of the present application, the radial distance of the stepped structure is set to 0.5 mm, the axial distance between adjacent stepped structures is set to 1 mm, and the upper and lower deviations are both set to 0.05 mm.

[0016] Additional aspects and advantages of the present application will be made apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0017] The accompanying drawings are included to provide a further understanding of the present application, and constitute a part of this specification that describes it, illustrate it and also explain the principles of the present application, but do not limit the present application.

[0018] Figure 1 It is a front view of the burr-free drilling tool of the embodiment of the present application;

[0019] Figure 2 It is a sectional view of the drill tip section and the stepped section in the burr-free drilling tool of the embodiment of the present application;

[0020] Figure 3 It is a front view of the burr-free drilling tool of the embodiment of the present application; Figure 2

[0021] Figure 4 It is a front view of the burr-free drilling tool of the embodiment of the present application; Figure 2

[0022] Figure 5 It is a front view of the burr-free drilling tool of the embodiment of the present application; Figure 2

[0023] Reference Signs:

[0024] Drill tip section 100;

[0025] Formed section 200; chip flute 201;

[0026] Stepped section 300; first stepped structure 301; first rake 3011; first side blade 3012; first chamfer 3013; second stepped structure 302; second rake 3021; cutting part 3022; avoiding part 3023; second chamfer 3024; third stepped structure 303; main blade 3031; third side blade 3032. DETAILED DESCRIPTION

[0027] The embodiments of the present application are described in detail below with reference to the accompanying drawings. The embodiments described below are examples for explaining the present application and should not be construed as limiting the present application.

[0028] ​​​In the description of this application, it should be understood that descriptions involving orientations, 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. They are only for the convenience of describing this application 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. Therefore, they cannot be understood as limitations on this application.

[0029] In the description of this application, "several" means more than one, "plurality" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0030] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, and connecting 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 this application based on the specific content of the technical solution.

[0031] In the description of this application, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples.

[0032] like Figure 1 As shown, an embodiment of the present application provides a burr-free drilling tool, which includes a drill tip section 100, a forming section 200 and a step section 300. The drill tip section 100 is conducive to positioning the burr-free drilling tool on the part to be processed, and also facilitates the burr-free drilling tool to initially enter the part to be processed; the forming section 200 limits the size of the hole to be processed, ensuring the dimensional accuracy of the hole to be processed.

[0033] Furthermore, the stepped section 300 can share the friction resistance of the main cutting edge 3031 in the burr-free drilling tool, maintain the sharpness of the main cutting edge 3031 for a long time, and thus reduce the generation of burrs.

[0034] In some examples, the drill tip segment 100 is at the end of the burr-free drilling tool and forms a tip, which is at the axial position of the burr-free drilling tool. During the hole machining process, the final shape of the hole corresponds to the shape of the burr-free drilling tool, so the tip of the drill tip segment 100 needs to be positioned at the axial position of the hole to be machined at the beginning of the machining to ensure the dimensional accuracy of the hole to be machined. It can be understood that the tip also facilitates the gradual penetration of the burr-free drilling tool into the part to be machined.

[0035] In some examples, the drill tip segment 100 is at the end of the burr-free drilling tool and forms a tip, which is at the axial position of the burr-free drilling tool. During the hole machining process, the final shape of the hole corresponds to the shape of the burr-free drilling tool, so the tip of the drill tip segment 100 needs to be positioned at the axial position of the hole to be machined at the beginning of the machining to ensure the dimensional accuracy of the hole to be machined. It can be understood that the tip also facilitates the gradual penetration of the burr-free drilling tool into the part to be machined.

[0036] Further, compared with the drill tip segment 100 and the stepped segment 300, the radial dimension of the forming segment 200 is larger and corresponds to the radial dimension of the hole to be machined. It can be understood that the radial dimension of the forming segment 200 has high accuracy, and when the forming segment 200 drills into the part to be machined, it ensures that the hole formed can meet the dimensional accuracy requirements.

[0037] In addition, the forming segment 200 is provided with a plurality of chip grooves 201 around it, which facilitates the discharge of machining chips along the chip grooves 201 out of the hole to be machined during the hole machining process, avoiding the influence of machining chips remaining in the hole on the dimensional accuracy of the hole to be machined.

[0038] In some examples, as shown in FIG. 1, the stepped segment 300 is between the drill tip segment 100 and the forming segment 200, and the stepped segment 300 includes a plurality of stepped structures, and each stepped structure is stacked. Figure 2

[0039] In some examples, the stepped segment 300 includes a plurality of stepped structures, and each stepped structure is stacked. Therefore, the distance of different stepped structures to the drill tip segment 100 and the forming segment 200 is different.

[0040] Specifically, when there are three stepped structures, the stepped segment 300 includes a first stepped structure 301, a second stepped structure 302 and a third stepped structure 303, the first stepped structure 301 is closest to the drill tip segment 100, the third stepped structure 303 is closest to the forming segment 200, and the second stepped structure 302 is between the first stepped structure 301 and the third stepped structure 303.

[0041] ​In the process of hole machining, the first stepped structure 301 first contacts the workpiece, then the second stepped structure 302 contacts the workpiece, and finally the third stepped structure 303 contacts the workpiece. The main blade 3031 is arranged on the third stepped structure 303. Since the first stepped structure 301 and the second stepped structure 302 first contact the workpiece and gradually increase the contact area with the workpiece, the main blade 3031 avoids contacting the workpiece with an excessively large contact area. Therefore, the first stepped structure 301 and the second stepped structure 302 can share the frictional resistance of the main blade 3031, reduce the wear of the main blade 3031, thereby reducing the generation of burrs, and also help to improve the cutting efficiency and service life of the burr-free drilling tool.

[0042] In some examples, as shown in FIG. 1, the stepped section 300 includes a first stepped structure 301, and the first stepped structure 301 includes a first front blade 3011 and a first side blade 3012 at an angle with each other. Figure 3 The first front blade 3011 is directed towards the to-be-machined hole and connected to the drill tip section 100, and the first side blade 3012 is at the edge of the first stepped structure 301. Specifically, the first front blade 3011 is perpendicular to the first side blade 3012.

[0043] The first front blade 3011 is used to contact the workpiece, and the radial dimension of the first side blade 3012 defines the contact area of the first front blade 3011 with the workpiece. At the same time, the first side blade 3012 also has a certain cutting effect on the side wall of the to-be-machined hole.

[0044] In some examples, a first chamfer 3013 is arranged at the position where the first front blade 3011 and the first side blade 3012 meet, which can reduce the wear of the blade edge and increase the service life of the burr-free drilling tool.

[0045] Specifically, the size of the first chamfer 3013 is 0.1 mm, and the upper and lower deviations are both 0.05 mm.

[0046] In some examples, as shown in FIG. 1, the stepped section 300 further includes a second stepped structure 302, and the second stepped structure 302 includes a second front blade 3021 and a second side blade at an angle with each other. Figure 4 The second front blade 3021 is directed towards the to-be-machined hole and connected to the first side blade 3012, and the second side blade is at the edge of the second stepped structure 302.

[0047] The second front edge 3021 is used to contact the workpiece, and the radial dimension of the second side edge defines the contact area of the burr-free drilling tool with the workpiece. It can be understood that the radial dimension of the second side edge is greater than the radial dimension of the first side edge 3012. When the second stepped structure 302 of the burr-free drilling tool enters the workpiece, the contact area of the burr-free drilling tool with the workpiece is further increased.

[0048] In some examples, the second side edge plays a cutting role on the sidewall of the machined hole, and the second side edge includes a cutting portion 3022 and a relief portion 3023 that are connected to each other, and the cutting portion 3022 is between the second front edge 3021 and the relief portion 3023.

[0049] The cutting portion 3022 is parallel to the axial direction of the burr-free drilling tool, and the relief portion 3023 is inclined to the middle part of the second stepped structure 302, so that the cutting portion 3022 and the relief portion 3023 are at an angle. It can be understood that the radial dimension of the second stepped structure 302 gradually decreases in the direction away from the first stepped structure 301. At the same time, due to the existence of the relief portion 3023, the contact area between the second side edge and the sidewall of the machined hole is reduced, and the friction therebetween is reduced, thereby reducing the wear of the edge.

[0050] In some examples, the length of the cutting portion 3022 is set to 0.3 mm, and the upper and lower deviations are both set to 0.05 mm. At the same time, the angle between the relief portion 3023 and the axial direction of the burr-free drilling tool is set to 5°.

[0051] In some examples, a second chamfer 3024 is arranged at the position where the second front edge 3021 and the cutting portion 3022 are connected, and the second chamfer 3024 can reduce the wear of the edge and increase the service life of the burr-free drilling tool.

[0052] Specifically, the size of the second chamfer 3024 is set to 0.1 mm, and the upper and lower deviations are both set to 0.05 mm.

[0053] In some examples, as shown in Figure 5 The stepped section 300 further includes a third stepped structure 303, and the third stepped structure 303 includes a main edge 3031 and a third side edge 3032 that are at an angle to each other. The main edge 3031 is directed towards the machined hole and connected to the second side edge, and the third side edge 3032 is at the edge of the third stepped structure 303.

[0054] The radial dimension of the third side edge 3032 is the same as the radial dimension of the forming section 200, and the third stepped structure 303 can also be understood as a part of the forming section 200, so that the radial dimension precision of the third side edge 3032 determines the size precision of the machined hole.

[0055] Meanwhile, the main blade 3031 is used to contact the part to be machined, and the radial dimension of the third side blade 3032 is greater than that of the second side blade. When the third stepped structure 303 of the burr-free drilling tool enters the part to be machined, the contact area between the burr-free drilling tool and the part to be machined is further increased.

[0056] In some examples, the main blade 3031 is inclined to the direction of the forming section 200, and specifically, the angle between the main blade 3031 and the radial direction of the burr-free drilling tool is set to 3°. The inclined arrangement of the main blade 3031 can form an acute angle at the connection position of the main blade 3031 and the third side blade 3032, thereby increasing the sharpness of the blade edge at this position and ensuring the dimensional accuracy of the side wall of the machined hole.

[0057] In some examples, the radial spacing of the stepped structure is set to 0.5 mm. When the radial spacing is greater than 0.5 mm, the area of the blade edge at each position is increased, resulting in greater frictional resistance; when the radial spacing is less than 0.5 mm, the area of the blade edge at each position is too small, resulting in poor wear resistance, and regardless of whether it is greater than or less than 0.5 mm, it will affect the service life of the drill bit.

[0058] Further, the axial spacing of adjacent stepped structures is set to 1 mm, and the upper and lower deviations are each set to 0.05 mm. When the axial spacing is greater than 1 mm, the length of the burr-free drilling tool is increased, affecting the rigidity; when the axial spacing is less than 1 mm, the heat and chip removal between the blade edges at each position will interfere with each other, affecting the service life of the burr-free drilling tool.

[0059] In some examples, according to burr-free drilling tools of different diameters, the number of layers of the stepped structure can be adaptively adjusted, and the number of layers of the stepped structure is set to 2 or 3 layers.

[0060] In the burr-free drilling tool, the following technical requirements exist: there are no notches in each cutting edge, and there is no burning phenomenon; the burr-free drilling tool is made of aluminum-magnesium alloy material; and the burr-free drilling tool is coated with 15+TiB2 material.

[0061] In actual implementation, the burr-free drilling tool needs to be assisted by an MQL tool holder and a machine tool MQL cooling system to achieve effective machining. The burr-free drilling tool needs to be provided with a central cooling hole, which plays a cooling role during drilling; the forming section 200 is provided with a relatively wide and smooth 15° spiral chip removal groove 201, which ensures that aluminum chips are quickly removed and are not easy to stick during high-speed machining; and the rotational speed of the machine tool during hole machining needs to be above 7000 r / min.

[0062] In some alternative embodiments, the function / operations referred to in the block diagrams can not occur in the order shown in the operational illustrations. For example, two blocks shown in succession can in fact be executed substantially concurrently or the blocks sometimes can be executed in reverse order, depending on the functionality / operations involved. Also, the embodiments presented and described in the flowcharts are only examples of the methods that can be employed in the application. The methods are not limited to the order in which the operations are presented in the flowcharts. Alternative embodiments are possible where the order of the operations is changed and where sub operations described as part of a larger operation are performed independently.

[0063] The embodiments of the present application are described in detail above with reference to the accompanying drawings, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present application. Furthermore, the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

Claims

1. A burr-free drilling tool, characterized in that: include: a drill tip section, the drill tip section being located at the end of the burr-free drilling tool and being used for drilling into a part to be processed; a forming section, wherein the radial dimension of the forming section matches the hole to be processed; The step section is located between the drill tip section and the forming section. The step section includes a plurality of stacked step structures. The radial size of each step structure gradually increases from the drill tip section to the forming section.

2. The burr-free drilling tool according to claim 1, characterized in that: The step section includes a first step structure, the first step structure includes a first leading edge and a first side edge that are angled with each other, the first leading edge is connected to the drill tip section, and the first side edge is at an edge of the first step structure.

3. The burr-free drilling tool according to claim 2, characterized in that: A first chamfer is provided at the connection position between the first front edge and the first side edge. The size of the first chamfer is set to 0.1 mm, and the upper deviation and the lower deviation are both set to 0.05 mm.

4. The burr-free drilling tool according to claim 2, characterized in that: The step section further includes a second step structure, the second step structure including a second front edge and a second side edge at an angle to each other, the second front edge connecting the first side edge, and the second side edge being located at an edge of the second step structure.

5. The burr-free drilling tool according to claim 4, characterized in that: The second side edge includes a cutting portion and an avoidance portion, the cutting portion is located between the second front edge and the avoidance portion, the avoidance portion is inclined toward the middle of the second step structure, and the avoidance portion is set at an angle of 5° to the axial direction of the burr-free drilling tool so that the avoidance portion avoids the side wall of the hole to be processed.

6. The burr-free drilling tool according to claim 5, characterized in that: The cutting portion is parallel to the axial direction of the burr-free drilling tool, the length of the cutting portion is set to 0.3 mm, and the upper deviation and the lower deviation are both set to 0.05 mm.

7. The burr-free drilling tool according to claim 5, characterized in that: A second chamfer is provided at a position where the cutting portion connects with the second side edge. The size of the second chamfer is set to 0.1 mm, and the upper deviation and the lower deviation are both set to 0.05 mm.

8. The burr-free drilling tool according to claim 4, characterized in that: The step section further includes a third step structure, which includes a main edge and a third side edge at an angle to each other, wherein the main edge is connected to the second side edge, and the third side edge is located at an edge of the third step structure.

9. The burr-free drilling tool according to claim 8, characterized in that: The main edge is inclined toward the forming section, and the angle between the main edge and the radial direction of the burr-free drilling tool is set to 3°, so that the connection position between the main edge and the third side edge forms a sharp corner protruding from the main edge.

10. The burr-free drilling tool according to claim 1, characterized in that: The radial spacing of the step structures is set to 0.5 mm; the axial spacing of adjacent step structures is set to 1 mm, and the upper deviation and the lower deviation are both set to 0.05 mm.

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