A drill-mill cutter

Abstract

The application discloses a drill and mill cutter, which comprises a rotary cutter body and two or more than two blades, the circumferential surface of the rotary cutter body is provided with the same number of blade grooves as the number of the blades, each blade is installed in the blade groove, the blade is provided with a blade front surface and a blade back surface, the middle part of the blade is provided with an installation through hole penetrating through the blade front surface and the blade back surface, the blade front surface is provided with a front surface bottom positioning surface and a front surface cutting edge unit, the blade back surface is provided with a back surface bottom positioning surface and a back surface cutting edge unit, the front surface bottom positioning surface is parallel to the back surface bottom positioning surface, the blade front surface is rotated 180 degrees around the axis of the installation through hole, and the front surface cutting edge unit is coincided with the back surface cutting edge unit after the front surface bottom positioning surface and the back surface bottom positioning surface are mirror imaged by a bisector plane. The application has the advantages of good universality, convenient installation, good machining quality and the like.

Description

Technical Field

[0001] This invention relates primarily to the field of metal cutting, and more particularly to a drilling and milling cutter. Background Technology

[0002] In the field of machining technology, expanding the machining functions and application range of cutting inserts can reduce the number of inserts used on a cutting tool, thereby reducing tool usage costs and simplifying insert installation. Employing multi-functional drilling and milling tools can effectively enable multi-part, multi-position machining, enhancing tool versatility.

[0003] In existing technologies, integrated drilling and milling tools mainly have the following two structures: 1. The tool uses two different inserts, one left insert and one right insert. The left insert corresponds to the left tool groove, and the right insert corresponds to the right tool groove. However, the two inserts have similar structures, and tool users generally do not have professional tool assembly skills, which may lead to the inserts being installed in the wrong tool groove. In addition, using two types of inserts increases the customer's inventory pressure and increases the cost of use. 2. The tool is equipped with two identical inserts, which are single-sided groove quadrilateral inserts. The two long sides of the insert are the cutting edges of the left and right inserts, respectively, corresponding to the left and right tool grooves. However, because the insert structure is a single-sided groove irregular quadrilateral insert, the left and right main cutting edges of the insert are nearly parallel to the bottom positioning surface. The drop between the two ends of the same main cutting edge is small, which is not conducive to the smooth discharge of chips during the cutting process and has an adverse effect on the surface quality of the machined surface. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a drill and milling cutter that is versatile, easy to install, and has good processing quality.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A drilling and milling cutter includes a rotating cutter body and two or more inserts. The circumferential surface of the rotating cutter body has grooves equal in number to the number of inserts. Each insert is installed in a groove. Each insert has a front side and a back side. A through hole is provided in the middle of the insert, penetrating the front side and the back side. The front side of the insert has a front bottom positioning surface and a front cutting edge unit. The back side of the insert has a back bottom positioning surface and a back cutting edge unit. The front bottom positioning surface and the back bottom positioning surface are parallel. After rotating the front side of the insert 180° about the axis of the through hole, and then mirroring it through the bisecting plane of the front bottom positioning surface and the back bottom positioning surface, the front cutting edge unit and the back cutting edge unit coincide.

[0007] As a further improvement to the above technical solution:

[0008] The front cutting edge unit includes a front main cutting edge, a front first secondary cutting edge, a front second secondary cutting edge, a front first transition edge, and a front second transition edge. One end of the front main cutting edge is connected to the front first secondary cutting edge through a front tip arc transition, and the other end of the front main cutting edge is connected to the front first transition edge through a front curve transition. The two ends of the front second secondary cutting edge are respectively connected to the front first secondary cutting edge and the intersection line of the front bottom positioning surface and the front short positioning surface. The two ends of the front second transition edge are respectively connected to the front first transition edge and the intersection line of the front bottom positioning surface and the front rear corner surface.

[0009] The reverse cutting edge unit includes a reverse main cutting edge, a reverse first secondary cutting edge, a reverse second secondary cutting edge, a reverse first transition edge, and a reverse second transition edge. One end of the reverse main cutting edge is connected to the reverse first secondary cutting edge via a reverse tip arc transition. The other end of the reverse main cutting edge is connected to the reverse first transition edge via a reverse curve transition. The two ends of the reverse second secondary cutting edge are respectively connected to the reverse first secondary cutting edge and the intersection line of the reverse bottom positioning surface and the reverse short positioning surface. The two ends of the reverse second transition edge are respectively connected to the reverse first transition edge and the intersection line of the reverse bottom positioning surface and the reverse rear corner surface.

[0010] The circumferential surface of the rotating cutter body is provided with a left cutter groove and a right cutter groove. The front bottom positioning surface of the blade installed in the left cutter groove is in contact with the left cutter groove bottom positioning surface, and the reverse long positioning surface is in contact with the left cutter groove long side positioning surface. The front short positioning surface is in contact with the left cutter groove short side positioning surface. The reverse bottom positioning surface of the blade installed in the right cutter groove is in contact with the right cutter groove bottom positioning surface, and the front long positioning surface is in contact with the right cutter groove long side positioning surface. The reverse short positioning surface is in contact with the right cutter groove short side positioning surface.

[0011] Both the front bottom positioning surface and the back bottom positioning surface are perpendicular to the axis of the mounting through hole.

[0012] The main cutting edge on the front side and the bottom positioning surface on the front side have an angle A, and the connection point between the main cutting edge on the front side and the arc of the tip on the front side is the highest point. The main cutting edge on the back side and the bottom positioning surface on the back side have an angle B, and the connection point between the main cutting edge on the back side and the arc of the tip on the back side is the highest point. The following conditions must be met: 5°≤A≤20°, 5°≤B≤20°.

[0013] The height difference between the two endpoints of the main cutting edge on the front side in a vector direction perpendicular to the bottom positioning surface on the front side is H1, and the height difference between the two endpoints of the main cutting edge on the back side in a vector direction perpendicular to the bottom positioning surface on the back side is H2. The following conditions must be met: 1mm≤H1≤3mm, 1mm≤H2≤3mm.

[0014] Compared with the prior art, the advantages of the present invention are as follows:

[0015] The drilling and milling cutter of this invention has multiple tool slots, and the inserts installed in each tool slot have the same structure. Both sides of the insert have a bottom positioning surface and a cutting edge unit. Different installation methods of the insert can achieve different cutting functions, reducing the difficulty of customer inventory preparation and reducing tool usage costs. Furthermore, the front side of the insert is rotated 180° about the axis of the through hole to be installed, and then mirrored through the bisecting plane of the front bottom positioning surface and the back bottom positioning surface, so that the front cutting edge unit and the back cutting edge unit coincide. The front and back sides of the insert have a clear correspondence with the tool slots. Even non-professionals can quickly and accurately install the insert into the corresponding tool slot without installation errors that would prevent the drilling and milling cutter from achieving its design functions, thus improving installation efficiency and machining quality. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the drill and milling cutter of the present invention.

[0017] Figure 2 This is a three-dimensional structural diagram of the right groove of the drill and milling cutter of the present invention.

[0018] Figure 3 This is a three-dimensional structural diagram of the left groove of the drill and milling cutter of the present invention.

[0019] Figure 4 This is a three-dimensional structural diagram of the cutting blade of the drill and milling cutter of the present invention.

[0020] Figure 5 This is a front view of the cutting insert of the drill and milling cutter of the present invention.

[0021] Figure 6 This is a rear view of the cutting blade of the drill and milling cutter of the present invention.

[0022] Figure 7 This is a side view of the cutting blade of the drill and milling cutter of the present invention.

[0023] The labels in the diagram represent:

[0024] 1. Rotating tool body; 2. Tool insert; 3. Tool insert front side; 31. Front side bottom locating surface; 311. Front side short locating surface; 312. Front side clearance angle surface; 313. Front side long locating surface; 32. Front side cutting edge unit; 321. Front side main cutting edge; 322. Front side first secondary cutting edge; 323. Front side second secondary cutting edge; 324. Front side first transition edge; 325. Front side second transition edge; 326. Front side tool tip arc; 327. Front side curve; 4. Tool insert back side; 41. Back side bottom locating surface; 411. Back side short locating surface; 412. Back side clearance angle surface; 413. Back side long locating surface Positioning surface; 42, reverse cutting edge unit; 421, reverse main cutting edge; 422, reverse first secondary cutting edge; 423, reverse second secondary cutting edge; 424, reverse first transition edge; 425, reverse second transition edge; 426, reverse tool tip arc; 427, reverse curve; 5, mounting through hole; 6, tool groove; 61, left tool groove; 611, left tool groove bottom positioning surface; 612, left tool groove long side positioning surface; 613, left tool groove short side positioning surface; 62, right tool groove; 621, right tool groove bottom positioning surface; 622, right tool groove long side positioning surface; 623, right tool groove short side positioning surface. Detailed Implementation

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] In the description of this invention, it should be noted that the terms "center", "upper", "lower", "horizontal", "inner", "outer", "top", "bottom", etc., which indicate orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0027] Figures 1 to 7This invention illustrates an embodiment of a drill-and-mill cutter. The cutter includes a rotating cutter body 1 and two or more inserts 2. The circumferential surface of the rotating cutter body 1 has the same number of slots 6 as the inserts 2. Each insert 2 is installed in a slot 6. Each insert 2 has a front insert 3 and a back insert 4. A through-hole 5 is provided in the middle of each insert 2, penetrating both the front insert 3 and the back insert 4. The front insert 3 has a front bottom positioning surface 31 and a front cutting edge unit 32. The back insert 4 has a back bottom positioning surface 41 and a back cutting edge unit 42. The front bottom positioning surface 31 and the back bottom positioning surface 41 are parallel. The front insert 3 is rotated 180° about the axis of the through-hole 5, and then mirrored through a bisecting plane of the front bottom positioning surface 31 and the back bottom positioning surface 41. The front cutting edge unit 32 and the back cutting edge unit 42 are then... The face cutting edge unit 42 overlaps, and multiple tool slots 6 are provided. The inserts 2 installed in each tool slot 6 have the same structure. Both the front and back sides of the insert 2 are provided with bottom positioning surfaces and cutting edge units. Different installation methods of the inserts can achieve different cutting functions, reducing the difficulty of customer inventory preparation and reducing tool usage costs. Moreover, the front side 3 of the insert is rotated 180° about the axis of the mounting through hole 5, and then mirrored through the bisecting plane of the front bottom positioning surface 31 and the back bottom positioning surface 41. The front cutting edge unit 32 and the back cutting edge unit 42 overlap. The front and back sides of the insert 2 have a clear correspondence with the tool slots 6. Even non-professionals can quickly and accurately install the insert 2 into the corresponding tool slots 6 without installation errors that would prevent the drilling and milling cutter from achieving its design function, thus improving installation efficiency and machining quality.

[0028] In this embodiment, the front cutting edge unit 32 includes a front main cutting edge 321, a front first secondary cutting edge 322, a front second secondary cutting edge 323, a front first transition edge 324, and a front second transition edge 325. One end of the front main cutting edge 321 is connected to the front first secondary cutting edge 322 via a front tip arc 326, and the other end of the front main cutting edge 321 is connected to the front first transition edge 324 via a front curve 327. The two ends of the front second secondary cutting edge 323 are respectively connected to the intersection lines of the front first secondary cutting edge 322 and the front bottom positioning surface 31 and the front short positioning surface 311. The two ends of the front second transition edge 325 are respectively connected to the intersection lines of the front first transition edge 324 and the front bottom positioning surface 31 and the front rear corner surface 312. The front bottom positioning surface 31 is included on one side of the front cutting edge unit 32. When the insert 2 is installed in the left tool groove 61, it serves a positioning function. At the same time, without changing the length and width of the insert, the size of the front bottom positioning surface 31 can be easily adjusted by adjusting the length of the second secondary cutting edge 323 and the second transition edge 325 on the front side. The shape and size of the front bottom positioning surface 31 can be adjusted according to the needs of the actual application scenario, optimizing the clamping stability of the insert installed in the tool groove, thereby increasing the insert life, reducing the possibility of vibration during cutting, and improving the insert performance. Specifically, it can effectively improve the consistency of the outer periphery cutting edge height of the insert, reduce the cutting edge height difference of the insert, reduce the difficulty of insert manufacturing, and facilitate the control of insert precision. At the same time, it can correspondingly increase the size of the front long positioning surface 313 and the front clearance angle surface 312, increase the positioning area, improve the clamping and positioning stability of the insert, and reduce vibration during cutting.

[0029] In this embodiment, the reverse cutting edge unit 42 includes a reverse main cutting edge 421, a reverse first secondary cutting edge 422, a reverse second secondary cutting edge 423, a reverse first transition edge 424, and a reverse second transition edge 425. One end of the reverse main cutting edge 421 is connected to the reverse first secondary cutting edge 422 through a reverse tip arc 426, and the other end of the reverse main cutting edge 421 is connected to the reverse first transition edge 424 through a reverse curve 427. The two ends of the reverse second secondary cutting edge 423 are respectively connected to the reverse first secondary cutting edge 422 and the intersection line of the reverse bottom positioning surface 41 and the reverse short positioning surface 411. The two ends of the reverse second transition edge 425 are respectively connected to the reverse first transition edge 424 and the intersection line of the reverse bottom positioning surface 41 and the reverse rear corner surface 412.

[0030] In this embodiment, the circumferential surface of the rotating cutter body 1 is provided with a left cutter groove 61 and a right cutter groove 62. The front bottom positioning surface 31 of the blade 2 installed in the left cutter groove 61 contacts the left cutter groove bottom positioning surface 611 of the left cutter groove 61, and the reverse long positioning surface 413 contacts the long side positioning surface 612 of the left cutter groove. The front short positioning surface 311 contacts the short side positioning surface 613 of the left cutter groove. The reverse bottom positioning surface 41 of the blade 2 installed in the right cutter groove 62 contacts the right cutter groove bottom positioning surface 621, and the front long positioning surface 313 contacts the long side positioning surface 622 of the right cutter groove. The reverse short positioning surface 411 contacts the short side positioning surface 623 of the right cutter groove. The correspondence and positioning relationship of the two blades 2 in the left cutter groove 61 and the right cutter groove 62 are clear, the installation is convenient, and the positioning is reliable, which improves the machining quality of the tool.

[0031] In this embodiment, both the front bottom positioning surface 31 and the back bottom positioning surface 41 are perpendicular to the axis of the mounting through hole 5.

[0032] In this embodiment, there is an angle A between the front main cutting edge 321 and the front bottom positioning surface 31, and the connection point between the front main cutting edge 321 and the front tip arc 326 is the highest point. There is an angle B between the reverse main cutting edge 421 and the reverse bottom positioning surface 41, and the connection point between the reverse main cutting edge 421 and the reverse tip arc 426 is the highest point, and the following conditions are met: 5°≤A≤20°, 5°≤B≤20°.

[0033] In this embodiment, the height difference between the two endpoints of the front main cutting edge 321 in the vector direction perpendicular to the front bottom positioning surface 31 is H1, and the height difference between the two endpoints of the back main cutting edge 421 in the vector direction perpendicular to the back bottom positioning surface 41 is H2. The following conditions should be met: 1mm≤H1≤3mm, 1mm≤H2≤3mm. This is beneficial for chip removal during the cutting process and avoids adverse effects on surface quality during drilling and milling.

[0034] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the present invention, should fall within the protection scope of the present invention.

Claims

1. A drilling and milling cutter, comprising a rotating cutter body (1) and two or more inserts (2), wherein the circumferential surface of the rotating cutter body (1) has a number of slots (6) equal to the number of inserts (2), and each insert (2) is respectively installed in the slot (6), characterized in that: The blade (2) has a front side (3) and a back side (4). The blade (2) has a mounting through hole (5) in the middle that passes through the front side (3) and the back side (4). The front side (3) has a front bottom positioning surface (31) and a front cutting edge unit (32). The back side (4) has a back bottom positioning surface (41) and a back cutting edge unit (42). The front bottom positioning surface (31) is parallel to the back bottom positioning surface (41). The front side (3) is rotated 180° about the axis of the mounting through hole (5) and then the front bottom positioning surface (31) is rotated. After mirroring the bisecting plane of the face (31) and the reverse bottom positioning surface (41), the front cutting edge unit (32) coincides with the reverse cutting edge unit (42). The front cutting edge unit (32) includes a front main cutting edge (321), a front first secondary cutting edge (322), a front second secondary cutting edge (323), a front first transition edge (324), and a front second transition edge (325). One end of the front main cutting edge (321) is connected to the front first secondary cutting edge (322) through a front tip arc (326), and the other end of the front main cutting edge (321) is connected to the front second secondary cutting edge (322). The first transition edge (324) is connected by a front curve (327). The two ends of the second secondary cutting edge (323) are respectively connected to the intersection of the first secondary cutting edge (322) and the front bottom positioning surface (31) and the front short positioning surface (311). The two ends of the second transition edge (325) are respectively connected to the intersection of the first transition edge (324) and the front bottom positioning surface (31) and the front rear corner surface (312). The circumferential surface of the rotating cutter body (1) is provided with a left cutter groove (61) and a right cutter groove (62), and the cutter is installed in the left cutter groove (61). The front bottom positioning surface (31) of the blade (2) is in contact with the left bottom positioning surface (611) of the left groove (61), and the reverse long positioning surface (413) is in contact with the long side positioning surface (612) of the left groove. The front short positioning surface (311) is in contact with the short side positioning surface (613) of the left groove. The reverse bottom positioning surface (41) of the blade (2) installed in the right groove (62) is in contact with the bottom positioning surface (621) of the right groove, and the front long positioning surface (313) is in contact with the long side positioning surface (622) of the right groove. The reverse short positioning surface (411) is in contact with the short side positioning surface (623) of the right groove.

2. The drilling and milling cutter according to claim 1, characterized in that: The reverse cutting edge unit (42) includes a reverse main cutting edge (421), a reverse first secondary cutting edge (422), a reverse second secondary cutting edge (423), a reverse first transition edge (424), and a reverse second transition edge (425). One end of the reverse main cutting edge (421) is connected to the reverse first secondary cutting edge (422) through a reverse tip arc (426). The other end of the reverse main cutting edge (421) is connected to the reverse first transition edge (424) through a reverse curve (427). The two ends of the reverse second secondary cutting edge (423) are respectively connected to the reverse first secondary cutting edge (422) and the intersection line of the reverse bottom positioning surface (41) and the reverse short positioning surface (411). The two ends of the reverse second transition edge (425) are respectively connected to the reverse first transition edge (424) and the intersection line of the reverse bottom positioning surface (41) and the reverse rear corner surface (412).

3. The drilling and milling cutter according to claim 1 or 2, characterized in that: Both the front bottom positioning surface (31) and the back bottom positioning surface (41) are perpendicular to the axis of the mounting through hole (5).

4. The drilling and milling cutter according to claim 2, characterized in that: The front main cutting edge (321) and the front bottom positioning surface (31) have an angle A, and the connection point between the front main cutting edge (321) and the front tip arc (326) is the highest point. The back main cutting edge (421) and the back bottom positioning surface (41) have an angle B, and the connection point between the back main cutting edge (421) and the back tip arc (426) is the highest point, and satisfy: 5°≤A≤20°, 5°≤B≤20°.

5. The drilling and milling cutter according to claim 2, characterized in that: The height difference between the two endpoints of the front main cutting edge (321) in the vector direction perpendicular to the front bottom positioning surface (31) is H1, and the height difference between the two endpoints of the back main cutting edge (421) in the vector direction perpendicular to the back bottom positioning surface (41) is H2. The following conditions should be met: 1mm≤H1≤3mm, 1mm≤H2≤3mm.

Images