Wear-resistant indexable circular blade with arc-shaped chip guide grooves for heavy milling of multiple microtextures

Abstract

The utility model discloses a wear-resistant indexable circular blade with arc-shaped chip guide grooves for heavy milling, belongs to the field of heavy milling, and mainly solves the problems that during heavy milling, the blade is worn too early, the cutting temperature is too high, heat is easy to accumulate, so that tool-chip bonding is caused, chip breaking and guiding of the blade are difficult, and the service life of the blade is prolonged. And the cutting efficiency and the service life of the blade are influenced. The blade is in a circular truncated cone shape; a ratchet-shaped boss is arranged on the upper surface of the blade; an arc-shaped chip guide groove is formed in the upper surface of the blade; the front cutter surface is provided with an elliptical wear-resistant bulge and a spherical bulge; an arc-shaped micro-texture is arranged on the front cutter surface close to the cutting edge; dot-matrix-shaped micro-textures are arranged on the two sides of the front cutter face arc-shaped micro-texture; an annular groove micro-texture is arranged on the rear cutter surface close to the cutting edge; a positioning groove is formed in the rear blade surface of the blade, so that positioning and clamping are facilitated; a fastening screw hole is formed in the middle of the blade. The milling device is suitable for milling large castings represented by water chamber end sockets.

Description

Technical Field

[0001] The utility model belongs to the field of heavy-duty milling processing, and in particular relates to a wear-resistant indexable circular blade with multiple micro-texture arc-shaped chip guide grooves for heavy-duty milling. Background Art

[0002] As an important component of the AP1000 nuclear island evaporator of the third-generation nuclear power plant, the water chamber head weighs hundreds of tons and is forged from 508Ⅲ steel. It has the characteristics of high temperature resistance, corrosion resistance, large mass and complex geometric shape.

[0003] 508III steel is a typically difficult-to-machine material due to its high strength and hardness, as well as its high viscosity. Heavy milling, a primary machining method for water chamber heads, results in poor blade cutting performance, leading to increased blade wear and poor surface quality. Furthermore, heavy milling requires high cutting parameters, generating significant cutting forces and vibration, which can lead to excessively high cutting temperatures, heat accumulation, tool-chip adhesion, premature blade failure, and reduced blade life. Consequently, frequent blade replacement is required, increasing auxiliary machining time, reducing machining efficiency, and increasing production costs. Utility Model Content

[0004] The purpose of the utility model is to provide a wear-resistant indexable circular blade with multiple micro-texture arc-shaped chip guide grooves for heavy-duty milling, which mainly solves the problems of large cutting force, severe blade wear, excessive cutting temperature, heat accumulation leading to tool-chip adhesion, difficulty in blade chip breaking and chip guiding, and affecting the processing efficiency of the blade during heavy-duty milling.

[0005] A wear-resistant indexable circular blade with multiple micro-textures and arc-shaped chip guide grooves for heavy-duty milling. The blade has a circular profile, and the front cutting surface of the blade is provided with an arc-shaped micro-texture with a width of 40 μm and a triangular cross-section; the arc-shaped micro-texture is surrounded by elliptical wear-resistant protrusions and spherical protrusions, which are evenly distributed on the front cutting surface along the circumferential direction; the upper surface of the blade is provided with a ratchet-shaped boss; the upper surface of the blade is provided with an arc-shaped chip guide groove; the back cutting surface is provided with an annular groove micro-texture; the back cutting surface of the blade is provided with a positioning groove to facilitate blade positioning; a fastening screw hole is provided in the middle of the blade; the blade rake angle is 9°, the back angle is 8°, and the edge inclination angle is 0°; the blade is fixed to the cutter disc by a fastening screw.

[0006] The beneficial effects of the utility model are as follows:

[0007] The utility model adopts an integral structural design, which can reduce the blade processing cost; the blade has a frustum-shaped shape, a symmetrical structure, high strength, can withstand large cutting forces, and reduces the risk of edge chipping.

[0008] A ratchet-shaped boss is provided at the center of the upper surface of the blade, which can evenly distribute stress, improve the overall strength of the blade, and enhance the impact resistance of the blade.

[0009] The rake face of the blade and the side of the ratchet-shaped boss are connected to form an arc-shaped chip guide groove. The arc-shaped structure can improve the stress distribution and help the chips to be discharged smoothly, reducing the interference of chips on the machined surface during the cutting process and improving the processing quality; at the same time, it can reduce the contact area between the chips and the blade and enhance the heat dissipation effect.

[0010] An arc-shaped micro-texture is provided near the cutting edge on the rake face of the blade. Its curvature is the same as that of the cutting edge and its cross-section is triangular. This structure can effectively reduce the contact area between the blade and the chip. During the cutting process, a small amount of cutting fluid exists in the micro-texture groove, which can reduce the wear of the rake face and improve the cutting lubrication effect. At the same time, the triangular cross-section used by the micro-texture can improve the blade vibration caused by secondary cutting, so that the cutting process can proceed smoothly.

[0011] The blade's arc-shaped micro-texture is provided with lattice micro-textures on both sides, which are evenly distributed on both sides of the arc-shaped micro-texture along the circumferential direction, which can reduce the adhesion of chips on the blade surface, prevent chip accumulation, and keep the front cutting edge clean; the microporous structure increases the effective heat dissipation area of ​​the blade surface, which can enhance the heat dissipation capacity of the blade.

[0012] Elliptical wear-resistant protrusions and spherical protrusions are provided near the lattice micro-texture of the blade, which are evenly distributed on the rake face in the circumferential direction, which can improve the strength of the cutting edge and extend the service life of the cutting edge; reduce the contact area between the rake face and the chips, thereby reducing heat accumulation and making it difficult for the chips to stick to the blade; enhance the chip removal ability, which is conducive to the curling and breaking of the chips, reduce the friction between the blade and the chips, and improve the wear resistance of the blade; the spherical protrusions play an auxiliary role to the elliptical protrusions. When the chips are large, the chips play a secondary chip curling and chip breaking role when flowing through the spherical protrusions.

[0013] An annular groove micro-texture is provided on the flank surface of the blade near the cutting edge, which is evenly distributed on the flank surface in the circumferential direction. This can reduce the contact area between the blade and the workpiece, reduce the friction between the blade and the workpiece surface, and improve the wear resistance of the blade. At the same time, the annular micro-texture can also effectively balance the cutting force acting on the cutting edge, thereby protecting the cutting edge and increasing the service life of the blade.

[0014] The insert flank is provided with six insert positioning grooves along the circumferential direction, which can realize six effective indexing, facilitating positioning and clamping. If one of the cutting edges fails, the insert can be indexed 60° and the other cutting edges can be used to continue milling, thus improving processing efficiency and reducing processing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model.

[0016] Figure 2 It is a front view of the utility model.

[0017] Figure 3 It is a side view of the present utility model.

[0018] Figure 4 It is a rear view of the present invention.

[0019] Figure 5 for Figure 2 Cross-sectional view along the AA direction.

[0020] Figure 6 for Figure 2 A partial enlarged view of point I in the middle.

[0021] Figure 7 for Figure 3 A partial enlarged view of point II in the middle.

[0022] Figure 8 for Figure 5 A partial enlarged view of point III in the middle.

[0023] Markings in the figure: 1-cutting edge; 2-elliptical wear-resistant protrusion; 3-spherical protrusion; 4-lattice microtexture; 5-arc-shaped microtexture; 6-front cutting edge; 7-arc-shaped chip guide groove; 8-ratchet-shaped boss; 9-fastening screw hole; 10-annular groove microtexture; 11-flank cutting edge; 12-positioning groove. DETAILED DESCRIPTION

[0024] Specific implementation method 1: Combination Figures 1-8 As shown, a wear-resistant indexable circular blade with multiple micro-textures and arc-shaped chip guide grooves for heavy-duty milling, the blade has a truncated cone shape, and the area of ​​the bottom surface of the blade is smaller than the area of ​​the upper surface of the blade; a ratchet-shaped boss is provided at the center of the upper surface of the blade, and a circular arc-shaped chip guide groove is provided on the side of the ratchet-shaped boss on the upper surface of the blade; an arc-shaped micro-texture is provided on the front blade surface near the cutting edge; lattice-shaped micro-textures are provided on both sides of the arc-shaped micro-texture; elliptical wear-resistant protrusions and spherical protrusions are provided near the lattice-shaped micro-texture, and are evenly distributed on the front blade surface in the circumferential direction; an annular groove micro-texture is provided on the back blade surface near the cutting edge, and is evenly distributed on the back blade surface in the circumferential direction; a positioning groove is provided on the back blade surface; and a fastening screw hole for fixation is provided in the center of the blade.

[0025] Specific implementation method 2: Combined with Figure 3 、 Figure 5 and Figure 8 As shown, the blade described in this embodiment adopts an integral structure; the blade diameter is 16 mm, the blade thickness is 6.75 mm; the blade front angle is 9°, the blade back angle is 8°, and the blade edge inclination angle is 0°.

[0026] Specific implementation method three: Combination Figure 2 、 Figure 5 、 Figure 6 and Figure 8As shown, the front cutting edge of the blade described in this embodiment is provided with an arc-shaped micro-texture, which is evenly distributed on the front cutting edge along the circumferential direction. The two textures are spaced 45° apart, the texture cross-section is triangular, the texture width is 40μm, the texture spacing is 40μm, the outermost texture is 50μm away from the cutting edge, and its curvature is the same as the curvature of the cutting edge; this structure can effectively reduce the contact area between the blade and the chips, thereby reducing the wear on the front cutting edge; at the same time, the triangular cross-section used by the arc-shaped micro-texture can improve the blade vibration caused by secondary cutting and increase the service life of the blade.

[0027] Specific implementation method four: Figure 2 As shown, the front cutting edge of the blade described in this embodiment is provided with lattice micro-textures on both sides near the arc-shaped micro-texture, with a texture radius of 10 μm, a texture spacing of 50 μm, and a texture depth of 40 μm; the lattice micro-texture can reduce the adhesion of chips on the blade surface and keep the front cutting edge clean.

[0028] Specific implementation method five: Figure 2 As shown, the front cutting surface of the blade described in this embodiment is provided with an elliptical wear-resistant protrusion near the lattice micro-texture, which is evenly distributed on the front cutting surface along the circumferential direction. The elliptical wear-resistant protrusion has a good chip rolling and chip breaking effect, reduces the friction between the blade and the chips, and improves the wear resistance of the blade; at the same time, it can effectively increase the cutting edge strength.

[0029] Specific implementation method six: Figure 2 As shown, the front cutting surface of the blade described in this embodiment is provided with a spherical protrusion near the bottom of the arc-shaped micro-texture, which is evenly distributed on the front cutting surface along the circumferential direction. When the chips are large, the spherical protrusion can play a role of secondary chip rolling and chip breaking; at the same time, it can reduce the contact area between the front cutting surface and the chips, thereby reducing heat accumulation and making it difficult for the chips to stick to the blade; the spherical protrusion has an arc transition with the front cutting surface, which can disperse stress and improve the strength of the spherical protrusion.

[0030] Specific implementation method seven: combination Figure 2 、 Figure 5 and Figure 7 As shown, the upper surface of the blade described in this embodiment is provided with a ratchet-shaped boss, which can evenly distribute stress and enhance the overall strength of the blade. The side of the ratchet-shaped boss is provided with an arc-shaped chip guide groove, and each arc corresponds to an angle of 30° and a radius of 2.3mm. This structure can help the chips to be discharged smoothly, reduce the interference of the chips on the machined surface during the cutting process, and improve the machining quality. The arc-shaped structure can improve the stress distribution. The arc connection can act as a reinforcing rib to increase the strength near the cutting edge. The arc-shaped chip guide groove can achieve a smooth transition between the front cutting edge and the ratchet-shaped boss, which can effectively alleviate stress concentration.

[0031] Specific implementation method eight: combination Figure 3 、 Figure 7 and Figure 8As shown in the figure, the blade flank is the main contact area with the machined workpiece surface. An annular groove micro-texture is provided on the blade flank near the cutting edge, which is evenly distributed on the flank along the circumferential direction. The texture width is 30μm, the texture spacing is 50μm, the texture depth is 40μm, and the outermost texture is 50μm away from the cutting edge. This structure can reduce the contact area between the blade and the workpiece, reduce the friction between the blade and the workpiece surface, and improve the wear resistance of the blade. At the same time, the annular groove micro-texture can also effectively balance the cutting force acting on the cutting edge, thereby protecting the cutting edge and increasing the service life of the blade.

[0032] Specific implementation method nine: Combination Figure 2 and Figure 4 As shown, the insert adopts a round profile, has high strength and high cutting stability, can withstand large tool deflection and vibration, and is suitable for heavy milling operations.

[0033] Specific implementation method ten: Combination Figure 3 and Figure 4 As shown in the figure, there are six positioning grooves on the back face, which are evenly distributed along the circumferential direction, which are helpful for positioning and clamping. The blade can be effectively indexed 6 times; the blade is fixed to the cutter head by tightening screws. If one of the cutting edges fails, the blade can be indexed 60° and the other cutting edges can be used to continue milling, effectively improving the processing efficiency.

Claims

1. A wear-resistant indexable circular insert with multiple micro-textured arc-shaped chip guide grooves for heavy-duty milling, wherein the insert has a truncated cone shape and is characterized by: A ratchet-shaped boss (8) is provided at the center of the upper surface of the blade, and a circular arc chip guide groove (7) is provided on the side of the ratchet-shaped boss (8) on the upper surface of the blade; an arc-shaped micro-texture (5) is provided on the front blade surface (6) near the cutting edge (1); lattice-shaped micro-textures (4) are provided on both sides of the arc-shaped micro-texture (5); elliptical wear-resistant protrusions (2) and spherical protrusions (3) are provided near the lattice-shaped micro-texture (4), and are evenly distributed on the front blade surface (6) along the circumferential direction; an annular groove micro-texture (10) is provided on the back blade surface (11) near the cutting edge (1), and is evenly distributed on the back blade surface (11) along the circumferential direction; a positioning groove (12) is provided on the back blade surface (11); and a fastening screw hole (9) for fixing is provided at the center of the blade.

2. The wear-resistant indexable circular insert with multiple micro-texture arc-shaped chip guide grooves for heavy-duty milling according to claim 1, characterized in that: A ratchet-shaped boss (8) is provided at the center of the upper surface of the blade.

3. The wear-resistant indexable circular insert with multiple micro-texture arc-shaped chip guide grooves for heavy-duty milling according to claim 1, characterized in that: A circular arc chip guide groove (7) is provided on the side of the ratchet-shaped boss (8) on the upper surface of the blade, and the corresponding angle of each circular arc is 30 degrees, and the corresponding radius of the circular arc is 2.3 mm.

4. The wear-resistant indexable circular insert with multiple micro-texture arc-shaped chip guide grooves for heavy-duty milling according to claim 1, characterized in that: The arc-shaped micro-texture (5) on the front cutting surface (6) of the blade is provided with lattice-shaped micro-texture (4) on both sides, with a texture radius of 10 μm, a texture spacing of 50 μm, and a texture depth of 40 μm.

5. The wear-resistant indexable circular insert with multiple micro-texture arc-shaped chip guide grooves for heavy-duty milling according to claim 1, characterized in that: The blade back surface (11) is provided with an annular groove micro texture (10), which is evenly distributed along the circumferential direction, the corresponding angle of each micro texture is 30 degrees, the interval between two micro textures is 30 degrees, the texture width is 30 μm, the texture spacing is 50 μm, the texture depth is 40 μm, and the outermost texture is 50 μm away from the cutting edge (1).

6. The wear-resistant indexable circular insert with multiple micro-texture arc-shaped chip guide grooves for heavy-duty milling according to claim 1, characterized in that: Spherical protrusions (3) are provided on the blade rake face (6) close to the lower side of the arc-shaped micro-texture (5) and are evenly distributed along the circumferential direction. Elliptical wear-resistant protrusions (2) are provided between the two arc-shaped micro-textures (5).

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