Split type drilling tool

Abstract

The split type drilling machining tool comprises a tool body peripheral face, a handle portion, a cutting tool portion and a tool body peripheral face, a tool body end face, peripheral grooves and a center groove are formed in the end, away from the handle portion, of the cutting tool portion, the peripheral grooves comprise peripheral blade positioning grooves and peripheral chip containing grooves, and the center groove comprises a center blade positioning groove and a center chip containing groove. A peripheral chip groove and a central chip groove are formed in the peripheral surface of the cutter body, the central chip groove is connected with the central chip groove, the peripheral chip groove comprises a peripheral chip groove side wall and a peripheral chip groove bottom surface, a groove is formed in the peripheral chip groove side wall and is in a circular arc shape, the circular arc radius of the groove is R1, the maximum cutting width of a peripheral blade is L, and R1 is larger than or equal to 0.3 L and smaller than or equal to 0.6 L; and the maximum distance L1 between the groove and the side, close to the peripheral surface of the cutter body, of the peripheral blade meets the condition that L1 is larger than or equal to 1.2 L and smaller than or equal to 1.8 L. According to the split type drilling tool, the chip rolling and discharging performance and universality are improved, the machining requirements of different machining parameters and different materials can be met, and the service life is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metal cutting, in particular to a split type drilling tool. BACKGROUND

[0002] When the drilling tool is cutting, the cutting end mainly bears the cutting force, the spiral groove and the machined surface form a closed area, and the chip can only be discharged from the cutting end through the spiral groove. It is difficult to discharge the chip, and when the chip cannot be discharged outside the workpiece in time, the accumulated chip and the spiral groove, the machined surface form severe scraping and extrusion, the tool body will vibrate due to the imbalance of the circumferential force, which not only reduces the quality of the machined surface, but also greatly reduces the service life of the drilling tool. Therefore, the chip removal performance of the drilling tool is an important factor affecting the performance of the tool, which has high requirements for the chip winding performance of the tool.

[0003] In the prior art, in order to reduce the cost of using the tool, the drilling tool is usually designed as a replaceable split type structure, and the cost can be saved by replacing the blade, that is, the drilling tool is composed of two parts of a blade and a tool body. The blade includes a center blade and a peripheral blade, the center blade is used for center material removal, and the peripheral blade is used for peripheral material removal. For example, a drilling tool is disclosed in Chinese patent document No. 202210560807.5, wherein the center groove is arranged adjacent to the rotation center axis, the circumferential groove is arranged adjacent to the tool body circumferential surface, the tool body circumferential surface is provided with a center chip removal groove and a circumferential chip removal groove which are both spiral structures, the circumferential chip removal groove is directly connected with the circumferential chip pocket, the center chip removal groove and the center chip pocket are connected through a center transition groove, and the center transition groove extends from the rotation center axis to the tool body circumferential surface. In order to consider the machining convenience and strength of the tool, the circumferential chip pocket of the existing drilling tool is generally designed as a plane or a near plane. However, the drilling tool with the circumferential chip pocket has the following problems. First, since the linear speed of the peripheral blade is relatively high, when the drilling tool is used for small machining parameter cutting to obtain high surface quality, the thickness of the iron chip is small, it is difficult to normally curl and break, there are many long iron chips, the side wall is easily scraped, and the machining performance is poor. Second, the fine iron chips are easily accumulated at the joint of the circumferential chip removal groove and the circumferential chip pocket, and it is difficult to realize large parameter machining of the short chip material. Third, when soft materials and difficult-to-machine materials such as stainless steel are machined, the plastic deformation of the material is large, and the chip of the peripheral blade is also difficult to normally curl. At this time, the drilling tool has the problems of chip removal, such as tool side wall scraping, machining hole size out-of-tolerance, and even tool machining failure. Fourth, the side wall of the circumferential chip pocket is continuously impacted by the iron chip, and the wear is fast, so the service life of the tool is not good. In summary, the existing drilling tool has poor chip winding and removal performance, poor universality, and cannot meet the machining requirements of different machining parameters and different materials, and the service life is not good. SUMMARY

[0004] The technical problem solved by the present application is to overcome the shortcomings of the prior art, and to provide a split type drilling tool which not only improves the chip removal performance and universality, but also has good strength, can meet the processing requirements of different processing parameters and different materials, and prolongs the service life.

[0005] To solve the above technical problems, the present application adopts the following technical scheme: A split type drilling tool, comprising a cutting blade and a cutting tool body, the cutting blade comprising a peripheral blade and a central blade, the cutting tool body comprising a shank and a cutting tool part, the outer periphery of the cutting tool part being provided with a tool body peripheral surface, the shank, the cutting tool part and the tool body peripheral surface being symmetrical about a rotation center axis of the cutting tool body, one end of the cutting tool part away from the shank being provided with a tool body end surface, a peripheral blade groove adapted to the peripheral blade and a central blade groove adapted to the central blade, the peripheral blade groove comprising a peripheral blade positioning groove and a peripheral chip pocket, the central blade groove comprising a central blade positioning groove and a central chip pocket, the tool body peripheral surface being provided with a peripheral chip removal groove and a central chip removal groove which extend spirally about the rotation center axis, the central chip removal groove being connected with the central chip pocket, the peripheral chip pocket comprising a peripheral chip pocket side wall connected with the tool body peripheral surface and a peripheral chip pocket bottom surface connected with the peripheral blade positioning groove, the peripheral chip pocket side wall being provided with a groove extending from the peripheral chip removal groove to the tool body end surface, the groove being in the form of a circular arc in a normal plane B, the normal plane B being a plane perpendicular to the extension direction of the groove, the circular arc radius of the groove being R1, the maximum cutting width of the peripheral blade being L, and satisfying: 0.6L >= R1 >= 0.3L, the maximum distance between the groove and the side of the peripheral blade adjacent to the tool body peripheral surface being L1, and satisfying: 1.8L >= L1 >= 1.2L.

[0006] As a further improvement of the above technical scheme: The width of the groove gradually decreases from the peripheral chip removal groove to the tool body end surface.

[0007] The minimum distance between the groove and the tool body peripheral surface is L3, and satisfies: 6mm >= L3 >= 0mm.

[0008] L3 = 1.8mm.

[0009] L = 8.4mm, R1 = 5.0mm, and L1 = 13.5mm.

[0010] The groove is symmetrically arranged about a symmetry plane C, and the symmetry plane C is perpendicular to the normal plane B.

[0011] The symmetry plane C intersects with a plane perpendicular to the peripheral chip pocket bottom surface to form an intersection line J1, and the intersection line J1 and the rotation center axis form an angle a, and satisfies: 20° >= a >= 0°.

[0012] The intersection of the groove and the symmetry plane C forms an intersection line J2, which is a curve.

[0013] The intersection line J2 has a radius of curvature R2, which satisfies: 2.5L >= R2 >= 1.5L.

[0014] The intersection line J2 includes a first line segment J21 connected to the end face of the tool body and a second line segment J22 connected to the peripheral chip flute, the first line segment J21 is in the form of a circular arc with a radius R3, the second line segment J22 is in the form of a circular arc with a radius R4 and is tangent to the first line segment J21, and satisfies: 2.5L >= R3 >= 1.5L, R4 > R3; or, the second line segment J22 is in the form of a straight line and is tangent to the first line segment J21.

[0015] Compared with the prior art, the present application has the following advantages: The split drilling tool has the following advantages: the special groove design changes the flow direction of iron chips when the iron chips generated by the peripheral blade cutting flow to the side wall of the peripheral chip flute, and assists the iron chips to curl and break inward; the production of long iron chips is effectively reduced, the side wall scraping is reduced, and the machining performance is improved when cutting in small machining parameters and machining soft materials; the groove on the side wall of the peripheral chip flute is arranged in communication with the peripheral chip flute at one end and penetrates to the end face of the tool body at the other end, so that the peripheral chip flute is communicated to the end face of the tool body, the accumulation of fine iron chips at the joint of the peripheral chip flute and the peripheral chip flute is effectively prevented, and large parameter machining of short cutting chip materials is realized; the groove effectively improves the chip curling and discharging performance of the peripheral blade, thereby meeting the machining requirements of different machining parameters and different materials and improving the versatility of the tool; meanwhile, the groove changes the flow direction of the iron chips, which is beneficial to avoiding the continuous impact of the iron chips on the side wall of the peripheral chip flute, reducing the impact wear, and prolonging the service life of the tool. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a three-dimensional structural schematic diagram of embodiment one of the split drilling tool.

[0017] Figure 2 is a three-dimensional structural schematic diagram of the peripheral groove in embodiment one of the split drilling tool.

[0018] Figure 3 is a three-dimensional structural schematic diagram of the central groove in embodiment one of the split drilling tool.

[0019] Figure 4is a left view structural schematic diagram of embodiment one of the split type drilling machining tool of the present application.

[0020] Figure 5 is a three-dimensional structural schematic diagram of normal plane B of the groove in embodiment one of the split type drilling machining tool of the present application.

[0021] Figure 6 is a cross-sectional structural schematic diagram of at the symmetric plane C of embodiment one of the split type drilling machining tool of the present application.

[0022] Figure 7 is a three-dimensional structural schematic diagram of symmetric plane C of the groove in embodiment one of the split type drilling machining tool of the present application.

[0023] Figure 8 is a front view structural schematic diagram of the cutting tool part in embodiment one of the split type drilling machining tool of the present application.

[0024] Figure 9 is a longitudinal cross-sectional structural schematic diagram of at the symmetric plane C of embodiment one of the split type drilling machining tool of the present application.

[0025] Figure 10 is a three-dimensional structural schematic diagram of embodiment two of the split type drilling machining tool of the present application.

[0026] Figure 11 is a longitudinal cross-sectional structural schematic diagram of at the symmetric plane C of embodiment two of the split type drilling machining tool of the present application.

[0027] Figure 12 is a longitudinal cross-sectional structural schematic diagram of at the symmetric plane C of embodiment three of the present application.

[0028] The various reference signs in the drawings represent: 1, cutting insert; 11, peripheral insert; 12, center insert; 2, cutting tool body; 21, shank; 22, cutting tool part; 23, tool body peripheral surface; 24, tool body end surface; 25, peripheral groove; 26, center groove; 27, rotation center axis; 31, peripheral insert positioning groove; 32, peripheral chip pocket; 33, peripheral chip flute; 41, center insert positioning groove; 42, center chip pocket; 43, center chip flute; 51, peripheral chip pocket side wall; 52, peripheral chip pocket bottom surface; 61, groove. DETAILED DESCRIPTION

[0029] The present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0030] In the description of the present application, it is to be understood by the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0031] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features referred to. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0032] In the present application, unless otherwise explicitly specified and limited, the terms "assembly", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0033] Example one: Figures 1 to 9The first embodiment of the split drilling tool is shown, the split drilling tool of the embodiment includes a cutting blade 1 and a cutting tool body 2, the cutting blade 1 includes a peripheral blade 11 and a center blade 12, the cutting tool body 2 includes a handle 21 and a cutting tool part 22, the outer periphery of the cutting tool part 22 is provided with a tool body peripheral surface 23, the handle 21, the cutting tool part 22 and the tool body peripheral surface 23 are all symmetrical about the rotation center axis 27 of the cutting tool body 2, the end of the cutting tool part 22 away from the handle 21 is provided with a tool body end surface 24, a peripheral groove 25 matched with the peripheral blade 11 and a center groove 26 matched with the center blade 12, the peripheral groove 25 includes a peripheral blade positioning groove 31 and a peripheral chip groove 32, the center groove 26 includes a center blade positioning groove 41 and a center chip groove 42, the tool body peripheral surface 23 is provided with a peripheral chip groove 33 and a center chip groove 43 which are both helically extended around the rotation center axis 27, the center chip groove 43 is connected with the center chip groove 42, the peripheral chip groove 32 includes a peripheral chip groove side wall 51 connected with the tool body peripheral surface 23 and a peripheral chip groove bottom surface 52 connected with the peripheral blade positioning groove 31, the peripheral chip groove side wall 51 is provided with a groove 61 extending from the peripheral chip groove 33 to the tool body end surface 24, the groove 61 is in the form of a circular arc on the normal plane B, the normal plane B is a plane perpendicular to the extending direction of the groove 61, the circular arc radius of the groove 61 is R1, the maximum cutting width of the peripheral blade 11 is L, and 0.6L≥R1≥0.3L is satisfied, the maximum distance between the groove 61 and the side of the peripheral blade 11 adjacent to the tool body peripheral surface 23 is L1, and 1.8L≥L1≥1.2L is satisfied.

[0034] The groove 61 extends from the peripheral chip groove 33 to the tool body end surface 24, that is, the groove 61 connects the peripheral chip groove 33 and the tool body end surface 24, that is, one end of the groove 61 is communicated with the peripheral chip groove 33, and the other end penetrates to the tool body end surface 24, which can prevent the accumulation of fine iron chips at the junction of the peripheral chip groove 33 and the peripheral chip groove 32 when short cutting materials are machined, and realize the machining of short chip materials with large parameters. The groove 61 is in the form of a circular arc on the normal plane B, which is beneficial to ensure that when cutting with small machining parameters and machining soft materials, the groove 61 can change the flow direction of long iron chips, assist the iron chips to curl inward and break, at the same time, the groove changes the flow direction of the iron chips, which is beneficial to avoid the continuous impact of the iron chips on the peripheral chip groove side wall 51, improve the service life and machining performance. 0.6L≥R1≥0.3L and 1.8L≥L1≥1.2L can improve the chip curling and discharging performance of the peripheral blade 11, further reduce the scraping of the peripheral chip groove side wall 51, further improve the machining performance and prolong the service life, and can also meet the machining and machining strength requirements of different machining parameters and different materials, and improve the universality.

[0035] The split drilling tool has a groove 61 with a special structure. When the iron filings generated by the peripheral blade 11 flow to the side wall 51 of the peripheral chip pocket, the groove 61 can change the flow direction of the iron filings, and assist the iron filings to curl inward and break. In the cutting of small machining parameters and soft materials, the generation of long iron filings is effectively reduced, the side wall scraping is reduced, and the machining performance is improved. The groove 61 on the side wall 51 of the peripheral chip pocket is arranged in communication with the peripheral chip groove 33 at one end and penetrates to the tool body end face 24 at the other end, so that the peripheral chip groove 33 is communicated to the tool body end face 24. The accumulation of fine iron filings at the junction of the peripheral chip groove 33 and the peripheral chip pocket 32 can be effectively prevented, and the machining of short chip materials with large parameters is realized. The groove 61 effectively improves the curling and discharging performance of the peripheral blade 11, thereby meeting the machining requirements of different machining parameters and different materials, and improving the versatility of the tool. At the same time, the groove 61 changes the flow direction of the iron filings, which is beneficial to avoid the continuous impact of the iron filings on the side wall 51 of the peripheral chip pocket, reduce the impact wear, and prolong the service life of the tool. In summary, through the design of the groove 61 with a special structure, the curling and discharging performance and versatility of the drilling tool as a whole are improved, the strength is good, the machining requirements of different machining parameters and different materials can be met, and the service life is prolonged.

[0036] Further, as shown in Figure 2 the embodiment, the width of the groove 61 gradually decreases from the peripheral chip groove 33 to the tool body end face 24, further reduces the curling radius of the iron filings, and makes the iron filings curl more tightly, thereby further improving the discharging performance.

[0037] Further, as shown in Figure 4 the embodiment, the minimum distance between the groove 61 and the tool body peripheral surface 23 is L3, which satisfies: 6mm≥L3≥0mm, and further reduces the scraping of the iron filings curled through the groove 61 on the side wall 51 of the peripheral chip pocket. Preferably, L3=1.8mm.

[0038] Preferably, L=8.4mm, R1=5.0mm, and L1=13.5mm.

[0039] Further, in the embodiment, the groove 61 is symmetrically arranged about the symmetry plane C, and the symmetry plane C is perpendicular to the normal plane B. The symmetric arrangement of the groove 61 about the symmetry plane C is beneficial to machining and improving the curling and discharging performance.

[0040] Further, as shown in Figure 8 the embodiment, the symmetry plane C intersects with the plane perpendicular to the bottom surface 52 of the vertical peripheral chip pocket to form an intersection line J1, and the angle between the intersection line J1 and the rotation center axis 27 is a, which satisfies: 20°≥a≥0°, and can better control the curling direction of the iron filings of the peripheral blade 11, thereby helping to improve the curling and discharging performance. Preferably, a=13°.

[0041] Further, as shown in Figure 7 the intersection of the recess 61 and the symmetry plane C forms a intersection line J2, the intersection line J2 is a curve, which can strengthen the tendency of the iron filings to curl inward, and is also conducive to ensuring the smoothness of the recess 61.

[0042] Further, in the embodiment, the radius of curvature of the intersection line J2 is R2, which satisfies: 2.5L≥R2≥1.5L, so that the tendency of the iron filings to curl inward is very good, and the smoothness of the recess 61 is also very good. Preferably, R2=16mm.

[0043] Embodiment two: Figure 10 and Figure 11 The second embodiment of the split type drilling tool of the present application is shown, the split type drilling tool of the present embodiment is basically the same as that of embodiment one, the difference is only that: the intersection line J2 includes a first line segment J21 and a second line segment J22, the first line segment J21 is connected with the end face 24 of the tool body, the second line segment J22 is connected with the peripheral chip flute 33, the first line segment J21 is in the form of a circular arc with a radius R3; the second line segment J22 is in the form of a circular arc with a radius R4 and is tangent to the first line segment J21, which satisfies: 2.5L≥R3≥1.5L, R4>R3. Preferably, R3=16mm, R4=40mm.

[0044] Embodiment three: Figure 12 The third embodiment of the split type drilling tool of the present application is shown, the split type drilling tool of the present embodiment is basically the same as that of embodiment one, the difference is only that: the second line segment J22 is in the form of a straight line and is tangent to the first line segment J21. Preferably, R3=16mm.

[0045] Although the present application has been disclosed with the above preferred embodiments, it is not intended to limit the present application. Any person skilled in the art can make many possible changes and modifications to the technical solutions of the present application, or modify equivalent embodiments with equivalent changes, without departing from the scope of the technical solutions of the present application, using the technical contents disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application, without departing from the content of the technical solutions of the present application, shall fall within the scope of protection of the technical solutions of the present application.

Claims

1. A split type drilling tool comprising a cutting insert (1) and a cutting tool body (2), the cutting insert (1) comprising a peripheral insert (11) and a central insert (12), the cutting tool body (2) comprising a shank (21) and a cutting tool portion (22), an outer periphery of the cutting tool portion (22) being provided with a tool body peripheral surface (23), the shank (21), the cutting tool portion (22) and the tool body peripheral surface (23) being symmetrical about a rotation center axis (27) of the cutting tool body (2), an end of the cutting tool portion (22) away from the shank (21) being provided with a tool body end surface (24), a peripheral groove (25) adapted to the peripheral insert (11) and a central groove (26) adapted to the central insert (12), the peripheral groove (25) comprising a peripheral insert positioning groove (31) and a peripheral chip pocket (32), the central groove (26) comprising a central insert positioning groove (41) and a central chip pocket (42), the tool body peripheral surface (23) being provided with a peripheral chip flute (33) and a central chip flute (43) extending helically about the rotation center axis (27), the central chip flute (43) being connected with the central chip pocket (42), the peripheral chip pocket (32) comprising a peripheral chip pocket side wall (51) connected with the tool body peripheral surface (23) and a peripheral chip pocket bottom surface (52) connected with the peripheral insert positioning groove (31), characterized in that: The peripheral flute side wall (51) is provided with a groove (61) extending from the peripheral flute (33) to the tool body end face (24), the groove (61) is in the form of a circular arc in the normal plane B, the normal plane B is a plane perpendicular to the extension direction of the groove (61), the circular arc radius of the groove (61) is R1, the maximum cutting width of the peripheral blade (11) is L, and 0.6L≥R1≥0.3L is satisfied, the maximum distance between the groove (61) and the side of the peripheral blade (11) adjacent to the tool body peripheral surface (23) is L1, and 1.8L≥L1≥1.2L is satisfied.

2. Split-type drilling machining tool according to claim 1, characterized in that: The width of the groove (61) gradually decreases from the peripheral flute (33) to the tool body end face (24).

3. The split-point machining tool of claim 1, wherein: The minimum distance between the groove (61) and the tool body peripheral surface (23) is L3, and 6mm≥L3≥0mm is satisfied.

4. A split-point machining tool according to claim 3, characterized in that: L3=1.8mm.

5. The split-point machining tool of claim 1 wherein: L=8.4mm, R1=5.0mm, and L1=13.5mm.

6. A split drilling tool according to any one of claims 1 to 5, characterized in that: The groove (61) is symmetrically arranged about the symmetry plane C, and the symmetry plane C is perpendicular to the normal plane B.

7. A split-point machining tool according to claim 6, characterized in that: The symmetry plane C intersects the plane perpendicular to the peripheral flute bottom surface (52) to form an intersection line J1, and the intersection line J1 and the rotation center axis (27) form an angle a, and 20°≥a≥0° is satisfied.

8. A split-point machining tool according to claim 7, characterized in that: The intersection of the groove (61) and the symmetry plane C forms an intersection line J2, and the intersection line J2 is a curve.

9. A split-point machining tool according to claim 8, characterized in that: The curvature radius of the intersection line J2 is R2, and 2.5L≥R2≥1.5L is satisfied.

10. A split-point machining tool according to claim 9, characterized in that: The intersection line J2 includes a first line segment J21 and a second line segment J22, the first line segment J21 is connected to the tool body end face (24), the second line segment J22 is connected to the peripheral flute (33), the first line segment J21 is in the form of a circular arc with a radius R3, the second line segment J22 is in the form of a circular arc with a radius R4 and is tangent to the first line segment J21, and 2.5L≥R3≥1.5L and R4>R3 are satisfied; or, the second line segment J22 is in the form of a straight line and is tangent to the first line segment J21.

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