Milling blade
By providing continuous first and second convex strips in front of the cutting of the milling insert, the problem of poor chip breaking effect of existing milling inserts is solved, the cutting strength and durability are improved, and the service life of the insert is extended.
Patent Information
- Application Number
- CN202421266109.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-05
- Publication Date
- 2025-05-06
- Estimated Expiration
- 2034-06-05
AI Technical Summary
The chip breaking effect of existing milling cutters during processing is poor, resulting in a large chip curling radius, affecting processing efficiency and quality, and accelerating blade wear at high temperatures and shortening service life.
A milling insert is designed, which includes an insert body with a screw hole in the center, a first transition edge and a second transition edge are provided at the top corner, the main cutting edge and the light-finishing edge extend in the direction of the screw hole to form a cutting front, and a continuous first convex strip and a second convex strip are provided in the lowering part of the cutting front to reduce the curling radius of the chip.
By reducing the crimp radius of chips, the chips are easier to break, improving the cutting strength and durability of the milling insert and extending the service life of the insert.
Smart Images
Figure CN222830790U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of cutting blades, in particular to a milling blade. Background Art
[0002] In the field of metal cutting, the requirements for parts processing accuracy are getting higher and higher. The existing milling inserts have some significant deficiencies during processing, which affect the processing efficiency and quality. Mainly including:
[0003] 1. The chip breaking effect is poor. In the existing design, the chip is often broken by the chip breaker groove. However, if there is no other structural design, the curling radius of the chip in the chip breaker groove is often relatively large, which makes the chip difficult to break, thereby forming long and continuous chips during the processing. These long chips are not only difficult to remove, but may also be entangled on the workpiece or the tool, affecting the normal processing operation, especially when the main cutting edge is relatively long, chips with a large curling radius are easily formed at the top angle.
[0004] Second, due to the large chip curling radius, the contact area with the front cutting edge is larger during the cutting process, resulting in a longer contact time, and the cutting heat generated is easily transferred to the front cutting edge through the chip.
[0005] 3. High temperature not only accelerates the wear of the blade material, but also reduces the hardness and strength of the blade, thus significantly shortening the service life of the blade. Operators need to frequently replace blades and clean chips, further affecting production efficiency and costs.
[0006] 4. The cutting strength of the milling insert will be weakened by the design of chip breaking by the chip breaker groove. Utility Model Content
[0007] In order to solve the above technical problems, the utility model provides a milling cutter blade.
[0008] The technical solution of the utility model is: it includes a blade body with a screw hole in the center, a first transition edge is arranged at the corresponding top corner of the blade body, the first transition edge is in an arc shape, and the two ends of the first transition edge are transitionally connected with a main cutting edge and a wiper edge respectively, the first transition edge, the main cutting edge and the wiper edge extend in the direction of the screw hole to form a first cutting front face, the first cutting front face is inclined and recessed in the direction of the screw hole, a continuous first convex strip is arranged on the descending part of the first cutting front face, and the extension direction of the first convex strip is the same as the extension direction of the main cutting edge.
[0009] Its further technical solution is:
[0010] The blade body is composed of an upper top surface, a lower bottom surface, two groups of back blade surfaces connected to the upper top surface and the lower bottom surface, and two groups of side surfaces. The blade body has a quadrangular pyramid structure, and the area of the lower bottom surface is smaller than that of the upper top surface.
[0011] Its further technical solution is:
[0012] The upper top surface is in the shape of a parallelogram in a plan view, and the main cutting edge is located on a longer side of the upper top surface.
[0013] Its further technical solution is:
[0014] The main cutting edges are in the form of smoothly connected cutting curves, and two groups of main cutting edges opposite to each other extend obliquely in opposite directions, so that the thickness at two relative corners of the upper top surface is greater than the thickness at the other two relative corners of the upper top surface.
[0015] Its further technical solution is:
[0016] A second transition edge is provided at one end of the main cutting edge away from the first transition edge. The second transition edge extends toward the screw hole to form a second cutting front face. The second cutting front face is inclined and recessed toward the screw hole and transitionally connected to the first cutting front face. A continuous second convex strip is provided on the descending part of the second cutting front face. The second convex strip extends toward the first cutting front face, and the extension direction is the same as the extension direction of the main cutting edge.
[0017] Its further technical solution is:
[0018] The upper top surface includes a mounting surface, the screw hole is located at the center of the mounting surface, the mounting surface is a descending inclined surface centered on the screw hole and surrounding the screw hole, and the first cutting front surface and the second cutting front surface are transitionally connected to the lower part of the inclined surface.
[0019] Its further technical solution is:
[0020] A third convex strip is provided between the first convex strip and the main cutting edge, and the third convex strip extends along the direction of chip discharge, and a plurality of groups of third convex strips are evenly arranged along the extension direction of the main cutting edge.
[0021] Its further technical solution is:
[0022] The back tool surface is sequentially connected to the first back tool surface, the second back tool surface and the third back tool surface along the upper top surface to the lower bottom surface, and the first back tool surface and the third back tool surface respectively form a first back angle а and a second back angle β with the surface perpendicular to the lower bottom surface, and the first back angle а is less than or equal to the second back angle β.
[0023] Its further technical solution is:
[0024] The extending and intersecting ridges of the upper top surface and the side surface form a wiper edge and an auxiliary cutting edge, and each wiper edge is transitionally connected with the auxiliary cutting edge on the same side by a concave curve to form a clearance.
[0025] Its further technical solution is:
[0026] The upper top surface has a chamfered edge on the entire periphery, and the chamfered edge is a narrow plane evenly arranged along the periphery of the cutting edge.
[0027] The beneficial technical effects of the utility model are as follows: by respectively arranging continuous first convex strips and second convex strips at the descending parts located at the first cutting front and the second cutting front, the curling radius of the chips is reduced, and the chips are easier to break; and the first convex strips and the second convex strips both have the function of reinforcing ribs, thereby enhancing the cutting strength of the milling blade during cutting work; and also avoiding more cutting heat from being transferred to the front cutting edge through the chips, thereby improving the durability of the milling blade. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0029] Figure 2 It is a top view schematic diagram of the utility model;
[0030] Figure 3 It is a schematic diagram of the first rear angle and the second rear angle of the utility model;
[0031] in:
[0032] а, first clearance angle; β, second clearance angle;
[0033] 1. Screw hole; 2. Blade body; 3. Upper top surface; 31. Mounting surface; 32. Rake face; 321. Front of main cutting edge; 322. Front of first transition edge; 323. Front of wiper edge; 324. Front of second cutting edge; 325. Front of secondary cutting edge; 4. Lower bottom surface; 5. Flank face; 51. First flank face; 52. Second flank face; 53. Third flank face; 6. Side surface; 7. Main cutting edge; 8. Wiper edge; 9. Secondary cutting edge; 10. First transition edge; 11. Second transition edge; 12. Behind first transition edge; 13. Behind second transition edge; 14. First ridge; 15. Second ridge; 16. Third ridge. DETAILED DESCRIPTION
[0034] In order to more clearly understand the technical means of the utility model and implement it according to the contents of the specification, the specific implementation methods of the utility model are further described in detail below in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the utility model but are not used to limit the scope of the utility model.
[0035] like Figure 1 to Figure 2As shown, the utility model provides a milling blade, including a blade body 2 with a screw hole 1 in the center, the blade body 2 is surrounded by an upper top surface 3, a lower bottom surface 4, two groups of back cutting surfaces 5 connected to the upper top surface 3 and the lower bottom surface 4, and two groups of side surfaces 6. The shape of the milling blade is a quadrangular pyramid structure, and the area of the lower bottom surface 4 is smaller than the area of the upper top surface 3, and the upper top surface 3 is approximately a parallelogram in a top view.
[0036] The upper top surface 3 includes a mounting surface 31 and a rake face 32, wherein the rake face 32 and the flank face 5 extend and intersect to form a main cutting edge 7, and the main cutting edge 7 is located on the longer side of the milling insert; the rake face 32 and the side surface 6 extend and intersect to form a wiper edge 8 and a secondary cutting edge 9, and a first transition edge 10 is provided at the tip between the main cutting edge 7 and the wiper edge 8, and the first transition edge 10 is transitionally connected to the main cutting edge 7 and the wiper edge 8 respectively; a second transition edge 11 is provided at one end of the main cutting edge 7 away from the first transition edge 10, and the second transition edge 11 is transitionally connected to another secondary cutting edge 9 on a different side, and the first transition edge 10 and the second transition edge 11 are both arc-shaped.
[0037] The main cutting edge 7 is used to perform the main cutting work; the finishing edge 8 repairs the machined surface, improves the quality and smoothness of the machined surface, and increases the impact resistance of the tool tip; the auxiliary cutting edge 9 is used to cooperate with the main cutting edge 7 to complete a small amount of cutting work.
[0038] The flank surface 5 is connected to the side surface 6 corresponding to the wiper edge 8 through a transition arc surface to form a first transition edge rear surface 12 at the transition angle. The first transition edge rear surface 12 is subjected to greater cutting force and cutting heat during cutting. The flank surface 5 is connected to the side surface 6 corresponding to another secondary cutting edge 9 on a different side through a transition arc surface to form a second transition edge rear surface 13 at the transition angle. The height H of the first transition edge rear surface 12 relative to the lower bottom surface 4 is greater than the height h of the second transition edge rear surface 13 relative to the lower bottom surface 4.
[0039] The main cutting edges 7 are in the form of smoothly connected cutting curves, and two groups of main cutting edges 7 opposite to each other on the milling blade extend obliquely in opposite directions, so the thickness at two relative corners of the upper top surface 3 is greater than the thickness at the other two relative corners of the upper top surface 3.
[0040] Furthermore, the screw hole 1 is located at the center of the mounting surface 31, and the mounting surface 31 is centered on the screw hole 1 and is a descending inclined surface around the screw hole 1. The main cutting edge 7, the first transition edge 10 and the wiper edge 8 extend toward the screw hole 1 to form a first cutting front surface, including a main cutting edge front surface 321, a first transition edge front surface 322 and a wiper edge front surface 323. The main cutting edge front surface 321, the first transition edge front surface 322 and the wiper edge front surface 323 are all inclined and recessed toward the screw hole 1 and are located at the recessed position and transitionally connected to the lower part of the inclined surface.
[0041] Furthermore, the second transition edge 11 and the auxiliary cutting edge 9 extend toward the screw hole 1 to form a second cutting front face 324 and an auxiliary cutting edge front face 325 respectively. The second cutting front face 324 and the auxiliary cutting edge front face 325 are both inclined and recessed toward the screw hole 1 and are located at the recessed part and transitionally connected to the lower part of the inclined surface.
[0042] The front face 321 of the main cutting edge, the front face 322 of the first transition edge, the front face 323 of the finishing edge, the front face 324 of the second cutting edge and the front face 325 of the secondary cutting edge respectively form chip breaking grooves with the inclined surface in the direction of the screw hole 1. During cutting, the chip breaking grooves allow the chips to flow out along the front cutting edge face 32 and contact, curl and break with the inclined surface, so as to reduce the contact friction between the chips and the upper top surface 3, thereby reducing the main cutting force.
[0043] The chip breaker groove tends to be linear and arc-shaped, that is, the chip breaker groove includes a linear portion for guiding the chip discharge and an arc portion for curling the chip, thereby causing deformation and breakage; since the linear portions of the chip breaker grooves formed by the front of the main cutting edge 321 close to the front of the first transition edge 322, the front of the first transition edge 322, and the front of the finishing edge 323 and the inclined surface are respectively too long, the chip contacts the upper top surface 3 for too long and the contact area is too large during the chip discharge process, thereby increasing the friction between the chip and the upper top surface 3, thereby increasing the main cutting force; at the same time, the cutting heat carried by the chip is more easily transferred to the blade body 2, affecting the service life of the milling blade.
[0044] In order to solve the above technical problems, in this embodiment, continuous first convex strips 14 are provided at the portion of the main cutting edge front 321 close to the first transition edge front 322, the first transition edge front 322 and the descending portion of the wiper edge front 323, and the extending direction of the first convex strips 14 is the same as the extending direction of the main cutting edge 7. The straight line portion for guiding the chip discharge is greatly shortened, and the first convex strips 14 reduce the curling radius of the chip, making it easier to break.
[0045] Furthermore, a portion of the main cutting edge front surface 321 close to the second cutting front surface 322 and a descending portion of the second cutting front surface 324 are provided with a continuous second convex strip 15 , and an extending direction of the second convex strip 15 is the same as an extending direction of the main cutting edge 7 .
[0046] The first convex strip 14 and the second convex strip 15 both function as reinforcing ribs, that is, they enhance the cutting strength of the milling cutter blade during cutting.
[0047] Furthermore, a third ridge 16 is provided in the chip breaker groove, and the third ridge 16 extends in the direction of chip discharge, and multiple groups of third ridges 16 are arranged in parallel and evenly in the chip breaker groove along the extension direction of the main cutting edge 7. Specifically, multiple groups of the third ridges 16 are distributed in the chip breaker groove near the first transition edge 10. The third ridge 16 can reduce the contact area between the chip and the upper top surface 3, thereby greatly reducing the heat transferred from the chip to the blade body; and improving the service life of the blade body.
[0048] The first convex strip 14 , the second convex strip 15 and the third convex strip 16 are all long heat dissipation strips, and the surfaces thereof are cylindrical structures.
[0049] In this embodiment, Figure 3 The flank surface 5 is sequentially connected with a first flank surface 51, a second flank surface 52 and a third flank surface 53 along the upper top surface 3 to the lower bottom surface 4. The first flank surface 51 and the third flank surface 53 respectively form a first flank angle а and a second flank angle β with the surface perpendicular to the lower bottom surface 4. The first flank angle а is less than or equal to the second flank angle β. This structure ensures that there is no interference between the flank surface 5 of the milling insert, especially the part close to the lower bottom surface 4 of the insert body 2, and the machined surface.
[0050] Furthermore, each of the wiper edges 8 and the secondary cutting edge 9 on the same side are transitionally connected by a concave curve to form a clearance, which can reduce the contact length between the secondary cutting edge 9 and the workpiece during the cutting process of the blade body, reduce the cutting resistance, and facilitate the discharge of chips.
[0051] Furthermore, the upper top surface 3 has a chamfered edge on the entire periphery, that is, a narrow plane is evenly provided along the cutting edge of the milling blade to increase the blade strength and improve the durability of the milling blade.
[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as within the protection scope of the present invention.
Claims
1. A milling insert, comprising a insert body (2) having a screw hole (1) at the center, a first transition edge (10) being provided at a corresponding vertex angle of the insert body (2), the first transition edge (10) being in an arc shape, and a main cutting edge (7) and a wiper edge (8) being transitionally connected at both ends of the first transition edge (10), characterized in that: The first transition edge (10), the main cutting edge (7) and the wiper edge (8) extend in the direction of the screw hole (1) to form a first cutting front face, the first cutting front face is inclined and recessed in the direction of the screw hole (1), a descending portion of the first cutting front face is provided with a continuous first convex strip (14), and the extension direction of the first convex strip (14) is the same as the extension direction of the main cutting edge (7).
2. A milling insert according to claim 1, characterized in that: The blade body (2) is formed by an upper top surface (3), a lower bottom surface (4), two groups of back blade surfaces (5) connected to the upper top surface (3) and the lower bottom surface (4), and two groups of side surfaces (6); the outer shape of the blade body (2) is a quadrangular pyramid structure, and the area of the lower bottom surface (4) is smaller than the area of the upper top surface (3).
3. A milling insert according to claim 2, characterized in that: The upper top surface (3) is in the shape of a parallelogram in a plan view, and the main cutting edge (7) is located on the longer side of the upper top surface (3).
4. A milling insert according to claim 2, characterized in that: The main cutting edges (7) are in the form of cutting curves that are smoothly connected in sequence, and two groups of main cutting edges (7) that are opposite to each other extend obliquely in opposite directions, so that the thickness at two relative corners of the upper top surface (3) is greater than the thickness at the other two relative corners of the upper top surface (3).
5. A milling insert according to claim 2, characterized in that: A second transition edge (11) is provided at one end of the main cutting edge (7) away from the first transition edge (10); the second transition edge (11) extends in the direction of the screw hole (1) to form a second cutting front face (324); the second cutting front face (324) is inclined and recessed in the direction of the screw hole (1) and transitionally connected to the first cutting front face; a continuous second convex strip (15) is provided at the descending portion of the second cutting front face (324); the second convex strip (15) extends toward the first cutting front face, and the extension direction is the same as the extension direction of the main cutting edge (7).
6. A milling insert according to claim 5, characterized in that: The upper top surface (3) comprises a mounting surface (31), the screw hole (1) is located at the center of the mounting surface (31), the mounting surface (31) is a descending inclined surface centered on the screw hole (1) and surrounding the screw hole (1), and the first cutting front surface and the second cutting front surface (324) are transitionally connected to the lower part of the inclined surface.
7. The milling insert according to claim 1, characterized in that: A third convex strip (16) is provided between the first convex strip (14) and the main cutting edge (7), the third convex strip (16) extending in the direction of chip discharge, and a plurality of groups of third convex strips (16) are evenly arranged along the extension direction of the main cutting edge (7).
8. The milling insert according to claim 2, characterized in that: The back tool surface (5) is sequentially transitionally connected with a first back tool surface (51), a second back tool surface (52) and a third back tool surface (53) along the upper top surface (3) to the lower bottom surface (4); the first back tool surface (51) and the third back tool surface (53) respectively form a first back angle а and a second back angle β with a surface perpendicular to the lower bottom surface (4); the first back angle а is less than or equal to the second back angle β.
9. The milling insert according to claim 2, characterized in that: The ridges extending from the upper top surface (3) and the side surface (6) intersect to form a wiper edge (8) and an auxiliary cutting edge (9), and each wiper edge (8) and the auxiliary cutting edge (9) on the same side are transitionally connected by a concave curve to form a clearance.
10. The milling insert according to claim 2, characterized in that: The upper top surface (3) has a chamfered edge on the entire periphery, and the chamfered edge is a narrow plane evenly arranged along the periphery of the cutting edge.