Milling cutter blade

Abstract

The utility model relates to the technical field of milling cutters, in particular to a milling cutter blade which comprises two identical and opposite end faces, a peripheral side face extending between the two opposite end faces, a chip guiding face parallel to the end faces and slightly lower than the end faces, and at least one group of cutting edges symmetrically arranged on the two opposite corner side faces with the end faces as the center. The cutting edge comprises a corner cutting edge which is raised at a corner side surface and a main cutting edge which is raised at an inclined side surface associated with the corner side surface; the corner cutting edge and the main cutting edge extend and descend to the chip guiding face, and a concave chip discharging groove is formed among the corner cutting edge, the main cutting edge, the chip guiding face and the end face. The milling cutter is provided with a cutting edge streamline in smoother transition, the stress of the cutting edge in unit length is reduced, the milling cutter can bear higher feeding speed, the service life of the blade is prolonged, the chip discharging groove follows the natural streamline of the cutting edge, chips are effectively guided to be discharged, and heat accumulation and workpiece surface damage caused by chip accumulation are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of milling cutters, in particular to a milling cutter blade. Background Art

[0002] In the current field of metal cutting, milling cutters are key cutting tools, and their performance directly affects processing efficiency, precision, and cost control. Traditional milling cutter design often focuses on improving a single cutting performance, such as enhancing the hardness of the blade and improving the geometry of the cutting edge. Existing milling cutter blades have certain problems: the cutting edge design is simple, and the blade structure cannot be fully utilized for stress dispersion, resulting in easy edge damage at high feed speeds; the chip removal effect is poor, and improper chip control can easily lead to a decrease in the quality of the processed surface, and even damage to the tool or machine tool. Utility Model Content

[0003] 1. Technical issues to be solved

[0004] The utility model aims to provide a milling cutter blade which can withstand a higher feed speed and has a chip discharge groove design which is more conducive to chip discharge.

[0005] 2. Technical Solution

[0006] The utility model is realized by the following technical solutions:

[0007] The utility model provides a milling cutter blade, comprising:

[0008] two identical and opposite end faces;

[0009] An outer peripheral side surface extending between the two opposite end surfaces, the outer peripheral side surface comprising two opposite main side surfaces, two pairs of oblique side surfaces extending symmetrically between two edges of the main side surfaces, and a corner side surface located between adjacent main side surfaces and oblique side surfaces;

[0010] A chip guide surface that is parallel to and slightly lower than the end surface;

[0011] At least one set of cutting edges symmetrically arranged at two opposite corner sides with respect to the end face center, the cutting edges comprising:

[0012] Corner cutting edges raised from the corner sides;

[0013] a main cutting edge with a raised beveled flank associated with the corner flank;

[0014] The corner cutting edge and the main cutting edge extend downward toward the chip guide surface, and a concave chip groove is formed between the corner cutting edge, the main cutting edge, the chip guide surface and the end surface.

[0015] Furthermore, a single pair of inclined side surfaces extending symmetrically between the two edges of the main side surfaces has an arc-shaped chamfered surface associated with the two sides, and the arc-shaped chamfered surface is raised to form a trimming edge, and the inclination angles of the corner cutting edge, the main cutting edge, the trimming edge and the chip guide surface gradually transition and become smaller.

[0016] Furthermore, the value range of the included angle α between a single pair of oblique side surfaces extending symmetrically between two edges of the main side surface is 120°≤α≤160°.

[0017] Furthermore, a downwardly inclined edge finishing surface is formed on a ridge line where the corner cutting edge intersects with the main cutting edge, and a ridge line where the corner cutting edge intersects with the main side surface.

[0018] Furthermore, a through stepped hole is provided between two opposite end faces, and the stepped hole is symmetrically structured with a center plane as a boundary, and the center plane is a virtual plane bounded between the two end faces and equidistant from the two end faces.

[0019] Furthermore, the farthest longitudinal distance between the corner cutting edges on both sides of the center plane is LA, and the longitudinal distance between the two end surfaces is LB, and LA is 1.1 to 1.8 times of LB.

[0020] Furthermore, the width of the chip groove gradually deepens and widens from the corner cutting edge and the main cutting edge to the chip guide surface.

[0021] Furthermore, the apertures of the stepped holes increase gradually from the central interface to the two end surfaces, and the stepped holes include a minimum hole located at the central interface, and multiple levels of trapezoidal holes with apertures increasing successively; the aperture of the minimum hole is KA, and the aperture of the large end of the largest trapezoidal hole is KB; the side wall angle of the cross section of the smallest trapezoidal hole is β, and the side wall angle of the cross section of the largest trapezoidal hole is γ; wherein the value range of KA is 2.8 to 4.5 mm, the value range of KB is 3.0 to 5.0 mm, 8°≤β≤15°, and 25°≤γ≤38°.

[0022] Furthermore, the radius of the arc-shaped chamfered surface ranges from 1.0 to 2.5 mm; the corner side surface is an arc-shaped curved surface, and its radius ranges from 0.6 to 1.5 mm.

[0023] Furthermore, the distance between the two main side surfaces is PA, and the distance between the two independent and farthest oblique side surfaces is PB, and PB is 1.2 to 3 times of PA.

[0024] 3. Beneficial Effects

[0025] Compared with the prior art, the utility model has the following beneficial effects:

[0026] 1. The corner cutting edge and the main cutting edge of the utility model extend and lower toward the chip guide surface, thereby having a longer cutting edge engagement length and a smoother transition cutting edge streamline, reducing the stress of the cutting edge per unit length, enabling the milling cutter to withstand a higher feed speed and extending the life of the blade.

[0027] 2. The chip groove is formed by depression between the corner cutting edge, the main cutting edge, the chip guide surface and the end face. It not only follows the natural streamline of the cutting edge and effectively guides the chip discharge, avoiding heat accumulation and workpiece surface damage caused by chip accumulation, but also its gradual width and depth structure promotes the rapid evacuation of chips, keeps the processing area clean, helps reduce tool wear and prolongs tool life.

[0028] 3. The trimming edge formed by the bulge on the arc chamfered surface, through its small slope surface, not only helps to evenly distribute the cutting force, but also realizes a smooth transition from the cutting area to the chip guide surface, reducing the cutting resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a top view of the utility model;

[0030] Figure 2 It is the front view of the utility model;

[0031] Figure 3 yes Figure 1 Sectional view of section AA;

[0032] 100-end face; 200-peripheral side face; 201-main side face; 202-oblique side face; 203-corner side face; 204-arc chamfered face; 300-chip guide face; 400-cutting edge; 401-corner cutting edge; 402-main cutting edge; 403-trimming edge; 500-chip groove; 600-edge finishing face; 700-step hole. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0034] A milling cutter insert, see Figures 1 to 3, including two identical and opposite end faces 100, with a peripheral side surface 200 extending between the two opposite end faces 100, and the peripheral side surface 200 including two opposite main side surfaces 201, two pairs of oblique side surfaces 202 extending symmetrically between the two edges of the main side surfaces 201, and a corner side surface 203 located between the adjacent main side surfaces 201 and the oblique side surfaces 202. The insert has a chip guide surface 300 that is parallel to the end face 100 and slightly lower, where "low" means closer to the center plane, wherein the center plane is a virtual plane bounded between the two end faces 100 and equidistant from the two end faces 100.

[0035] In addition, a through stepped hole 700 is provided between the two opposite end faces 100 . The stepped hole 700 is symmetrically structured with the center plane as the boundary. The stepped hole 700 provides an assembly hole position for the milling cutter.

[0036] The utility model has at least one group of cutting edges 400, and the same group of cutting edges 400 are symmetrically arranged at two opposite corner side surfaces 203 with the end surface 100 as the center. Since the utility model has two end surfaces 100, at most two groups (i.e., four) of cutting edges 400 can be arranged on the two end surfaces 100, and the four cutting edges 400 can be the same or different to meet various processing requirements. Each cutting edge 400 can be divided into several sections, which at least include a corner cutting edge 401 raised from the corner side surface 203 and a main cutting edge 402 raised from the oblique side surface 202 associated with the corner side surface 203.

[0037] Among them, the corner cutting edge 401 and the main cutting edge 402 extend and lower toward the chip guide surface 300, thereby having a longer cutting edge engagement length and a smoother transition edge streamline, reducing the stress of the cutting edge 400 per unit length, thereby being able to adapt to a higher feed speed and extending the life of the blade.

[0038] In addition, a recessed chip groove 500 is formed between the corner cutting edge 401, the main cutting edge 402, the chip guide surface 300 and the end face 100. The design of the chip groove 500 is in line with the natural extension streamline of the cutting edge, so that the chips will not interfere with or scratch the workpiece surface or hit the tool when flowing out, forming naturally broken small fragments of chips, which is conducive to natural chip removal. The width of the chip groove 500 can be gradually deepened and widened from the corner cutting edge 401 and the main cutting edge 402 to the chip guide surface 300. During cutting, the chips gradually have a larger capacity space as the chip groove 500 extends, which is conducive to the rapid discharge of chips in a diffused manner and the molding of the milling surface.

[0039] In this embodiment, a single pair of inclined side surfaces 202 extending symmetrically between the two edges of the main side surface 201 has an arc-shaped chamfered surface 204 associated with the two sides. The arc-shaped chamfered surface 204 is raised to form a trimming edge 403. The inclination angles between the corner cutting edge 401, the main cutting edge 402, the trimming edge 403 and the chip guide surface 300 gradually transition and become smaller. The blade surface of the trimming edge 403 has a small slope surface that is closer to the chip guide surface 300. While maintaining uniform distribution of cutting force, it is beneficial to smoothly transition the milling surface structure of the main cutting edge 402 between the cutting tail end and the chip guide surface 300.

[0040] The value range of the included angle α between a single pair of oblique side surfaces 202 extending symmetrically between two edges of the main side surface 201 is 120°≤α≤160°.

[0041] A downwardly inclined edge finishing surface 600 is formed at the ridge line where the corner cutting edge 401 intersects with the main cutting edge 402, and at the ridge line where the corner cutting edge 401 intersects with the main side surface 201; in the assembly of the utility model, the edge clearance angle between the main cutting edge 402 and the milling surface is 10 to 12 degrees, and during milling, the edge finishing surface 600 is basically perpendicular to the milling surface.

[0042] The cutting edge depth of the corner cutting edge 401 defines the cutting depth of the milling cutter, and the longitudinal spacing between the two end faces 100 determines the basic structural strength of the milling cutter. In the utility model, the farthest longitudinal spacing of the corner cutting edge 401 located on both sides of the center plane is LA, and the longitudinal spacing between the two end faces 100 is LB, and LA is 1.1 to 1.8 times of LB.

[0043] In addition, the apertures of the stepped hole 700 increase step by step from the central interface to the two end surfaces. The stepped hole 700 includes a smallest hole located at the central interface and multiple levels of trapezoidal holes with apertures increasing in sequence; the aperture of the smallest hole is KA, and the aperture of the largest trapezoidal hole at the large end is KB; the side wall angle of the cross section of the smallest trapezoidal hole is β, and the side wall angle of the cross section of the largest trapezoidal hole is γ; wherein the value range of KA is 2.8 to 4.5 mm, the value range of KB is 3.0 to 5.0 mm, 8°≤β≤15°, and 25°≤γ≤38°.

[0044] The radius of the arc chamfered surface 204 is in the range of 1.0 to 2.5 mm; the corner side surface 203 is an arc-shaped curved surface, and the radius thereof is in the range of 0.6 to 1.5 mm.

[0045] The distance between the two main side surfaces 201 is PA, and the distance between the two irrelevant and farthest oblique side surfaces 202 is PB, which is 1.2 to 3 times of PA.

[0046] The above-described embodiments are merely descriptions of preferred implementations of the present invention, and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements made by ordinary personnel in the field to the technical solution of the present invention should fall within the protection scope of the present invention, and the technical contents of the present invention for protection have been fully recorded in the claims.

Claims

1. A milling cutter blade, characterized in that: include: two identical and opposite end faces; An outer peripheral side surface extending between the two opposite end surfaces, the outer peripheral side surface comprising two opposite main side surfaces, two pairs of oblique side surfaces extending symmetrically between two edges of the main side surfaces, and a corner side surface located between adjacent main side surfaces and oblique side surfaces; a chip guide surface which is parallel to and slightly lower than the end surface; At least one set of cutting edges symmetrically arranged at two opposite corner sides with respect to the end face center, the cutting edges comprising: Corner cutting edges raised from the corner sides; a main cutting edge with a raised beveled flank associated with the corner flank; The corner cutting edge and the main cutting edge extend downward toward the chip guide surface, and a concave chip groove is formed between the corner cutting edge, the main cutting edge, the chip guide surface and the end surface.

2. A milling cutter insert according to claim 1, characterized in that: A single pair of inclined side surfaces extending symmetrically between the two edges of the main side surfaces has an arc-shaped chamfered surface associated with the two sides, and the arc-shaped chamfered surface is raised to form a trimming edge, and the inclination angles of the corner cutting edge, the main cutting edge, the trimming edge and the chip guide surface gradually transition and become smaller.

3. A milling cutter blade according to claim 1 or 2, characterized in that: The value range of the included angle α between a single pair of oblique side surfaces extending symmetrically between the two edges of the main side surface is 120°≤α≤160°.

4. The milling cutter blade according to claim 1, characterized in that: A downwardly inclined edge finishing surface is formed at a ridge line where the corner cutting edge intersects with the main cutting edge and a ridge line where the corner cutting edge intersects with the main side surface.

5. A milling cutter blade according to claim 1 or 2, characterized in that: A through stepped hole is provided between two opposite end faces. The stepped hole is symmetrically structured with a central plane as a boundary. The central plane is a virtual plane bounded between the two end faces and equidistant from the two end faces.

6. A milling cutter insert according to claim 5, characterized in that: The farthest longitudinal distance between the corner cutting edges on both sides of the center plane is LA, and the longitudinal distance between the two end faces is LB, and LA is 1.1 to 1.8 times of LB.

7. The milling cutter blade according to claim 1, characterized in that: The width of the chip groove gradually deepens and widens from the corner cutting edge and the main cutting edge to the chip guide surface.

8. The milling cutter blade according to claim 5, characterized in that: The apertures of the stepped holes increase gradually from the central interface to the two end surfaces. The stepped holes include a minimum hole located at the central interface and multiple levels of trapezoidal holes with apertures increasing successively. The aperture of the minimum hole is KA, and the aperture of the large end of the largest trapezoidal hole is KB. The side wall angle of the cross section of the smallest trapezoidal hole is β, and the side wall angle of the cross section of the largest trapezoidal hole is γ. The value range of KA is 2.8 to 4.5 mm, the value range of KB is 3.0 to 5.0 mm, 8°≤β≤15°, and 25°≤γ≤38°.

9. The milling cutter blade according to claim 2, characterized in that: The radius of the arc chamfered surface ranges from 1.0 to 2.5 mm; the corner side surface is an arc-shaped curved surface, and its radius ranges from 0.6 to 1.5 mm.

10. The milling cutter insert according to claim 2, characterized in that: The distance between the two main side surfaces is PA, and the distance between the two independent and farthest oblique side surfaces is PB, and PB is 1.2 to 3 times of PA.

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