Reinforcing edge antifriction indexable blade for high-speed feeding heavy milling

Abstract

The utility model relates to a reinforced-edge antifriction indexable blade for high-speed feeding heavy milling, which is suitable for the field of heavy milling of large parts such as water chamber end sockets and the like. The utility model mainly solves the problems of poor wear and damage resistance, over-high cutting temperature, over-low cutting speed and the like of a cutter in heavy milling. The blade is hexagonal, boomerang-shaped bosses are arranged on the upper surface and the lower surface of the blade, and V-shaped cooling grooves are formed in the bosses. The blade is provided with a reinforcing edge structure, a cutting edge is provided with a negative rake angle chamfering structure, and a transition arc is arranged at a tool nose. A sinusoidal waveform micro-texture groove is formed in the position, close to a tool nose, of the front tool face, a triangular protrusion and a trapezoidal micro-texture groove are arranged on the lower portion and the two sides of the front tool face respectively, arrow-shaped abrasion-resistant chip breaking protrusions are further arranged on the front tool face, and matrix-shaped micro-texture grooves are formed in the positions, close to a cutting edge, of the main rear tool face and the auxiliary rear tool face of the blade. And a chip pocket is formed between the blade reinforcing edge and the boomerang-shaped boss. And a sunk screw hole is formed in the geometric center of the blade. The milling cutter is suitable for milling large forgings.

Description

Technical Field

[0001] The utility model is a tool for the heavy-duty milling field, which is suitable for high-speed feeding and anti-friction indexable milling inserts under extreme manufacturing conditions. Background Art

[0002] The water chamber head in the AP1000 nuclear power unit is used to seal the water vapor circulation system of the nuclear reactor. It is an important component of the nuclear reactor pressure vessel and therefore has strict design requirements and manufacturing standards to ensure the safe operation of the nuclear reactor.

[0003] The water chamber head is a large, special-shaped part with complex inner and outer spherical surfaces and nozzle shapes. After forging, the blank needs to be subjected to heavy milling to meet the requirements of use. The main material of the water chamber head is 508Ⅲ steel, which is a difficult-to-machine material. The reaction of high-melting-point elements with iron gives it high strength and plasticity, but also makes it difficult to machine. During the processing, the inner and outer spherical surfaces, inclined surfaces, cylindrical surfaces, cavities, etc. of the blank need to be processed. The material removal rate is high, the forming speed is slow, the tool path is complex, and the combined effect of large feed rate and back cutting amount causes significant tool vibration. At the same time, the mechanical and thermal loads change drastically, which reduces the tool's wear and breakage resistance and greatly shortens the tool's service life. The frequent replacement of tools seriously limits processing efficiency.

[0004] To address the above problems, a friction-reducing indexable insert with a reinforced edge was designed for high-speed feed heavy-duty milling. By setting up reinforced edges and various forms of micro-textures, the insert's wear and breakage resistance was improved, thereby extending the tool life. Utility Model Content

[0005] The purpose of the utility model is to provide a reinforced edge anti-friction indexable insert for high-speed feed heavy-duty milling, mainly to solve the problems of premature tool failure due to large cutting force, high cutting temperature and severe vibration impact during heavy-duty milling.

[0006] A reinforced edge anti-friction indexable insert for high-speed feed heavy-duty milling, the insert adopts a hexagonal outer contour; boomerang-shaped bosses are provided on the upper and lower surfaces of the insert; V-shaped cooling grooves are provided on the bosses; reinforced edges are provided on both sides of the insert; the cutting edge is provided with a negative rake angle chamfer structure, and the width of the negative rake angle chamfer is 0.1mm; a transition arc is provided at the tip of the insert; a sinusoidal micro-texture groove is provided near the tip of the insert on the front cutting edge; a trapezoidal micro-texture groove parallel to the main and secondary cutting edges is provided near the tip of the insert on the front cutting edge; an arrow-shaped wear-resistant chip-breaking protrusion is provided on the front cutting edge; a triangular protrusion is provided below the sinusoidal micro-texture groove; matrix-shaped micro-texture grooves are provided on the main and secondary back cutting edges of the insert near the cutting edge; a chip groove is formed between the reinforcing edge of the insert and the boomerang-shaped boss; a countersunk screw hole for connecting to the cutter disc is provided at the geometric center of the insert; the insert has a rake angle of 12°, a back angle of 0°, and an inclination angle of 11°.

[0007] The beneficial effects of the utility model are as follows:

[0008] The utility model adopts a hexagonal double-sided design, and the installation position of the hexagonal blade on the cutter disc is not easy to change, which can ensure the processing quality. At the same time, the hexagonal blade has a compact structure and good vibration resistance, and the double-sided design can reduce production costs.

[0009] There are six reinforcing edges on both sides of the blade, which can increase the strength of the tool cutting edge and improve the cutting edge's resistance to wear and breakage; the cutting edge of the blade is equipped with a negative rake chamfer, which can improve the distribution of force during cutting and reduce cutting temperature.

[0010] Both the upper and lower surfaces of the blade are equipped with boomerang-shaped bosses. The middle of the boomerang faces the reinforced edge, which helps to increase the strength of the reinforced edge and make the blade more evenly stressed during heavy cutting. The upper surface of the boss is equipped with a V-shaped cooling groove to improve the heat dissipation capacity of the blade. The V-shaped cooling groove can also store a small amount of cutting fluid to play a role in lubrication and cooling.

[0011] The blade's reinforced edge and the boomerang-shaped boss outer profile form a chip groove, which helps the outflow of chips, thereby reducing friction generated during cutting and further reducing heat accumulation.

[0012] The insert can be effectively indexed three times and used on both sides at the same time. If one of the cutting edges fails, the insert can be indexed 120° and the other cutting edge can be used to continue milling, reducing processing costs and improving production efficiency.

[0013] Sinusoidal micro-texture grooves and trapezoidal micro-texture grooves are provided on the rake face of the blade near the tip, which can form tiny grooves during the cutting process, which helps to store and distribute lubricants, thereby reducing friction between the tool and the workpiece; a triangular protrusion is provided below the sinusoidal micro-texture groove, which can guide chips and strengthen the strength of the tip; an arrow-shaped wear-resistant chip-breaking protrusion is provided on the rake face, with the arrow direction facing the cutting edge, which can slow down the wear of the rake face, while strengthening the cutting edge strength and improving the chip breaking ability.

[0014] The main and secondary flank surfaces of the insert are provided with matrix-shaped micro-texture grooves, which can reduce the contact area between the insert and the workpiece, reduce the friction between the insert and the workpiece surface, and thus play a role in slowing down tool wear.

[0015] A countersunk screw hole is provided at the geometric center of the blade, and the blade can be fixed to the milling cutter disc by screws. The countersunk screw hole can improve safety, improve surface flatness, reduce resistance, and help improve connection strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model.

[0017] Figure 2 It is a top view of the utility model.

[0018] Figure 3 It is a front view of the utility model.

[0019] Figure 4 It is a bottom view of the present utility model.

[0020] Figure 5 for Figure 2 Cross-sectional view along the AA direction.

[0021] Figure 6 for Figure 2 A partial enlarged view of point J in the middle.

[0022] Figure 7 for Figure 3 A magnified view of the part at K in the middle.

[0023] Figure 8 for Figure 5 A partial enlarged view of point L in the middle.

[0024] Markings in the figure: 1-front cutting edge; 2-negative rake angle chamfer; 3-sinusoidal micro-texture groove; 4-trapezoidal micro-texture groove; 5-chip groove; 6-arrow-shaped wear-resistant chip-breaking protrusion; 7-countersunk screw hole; 8-boomerang-shaped boss; 9-V-shaped cooling groove; 10-triangular protrusion; 11-transition arc; 12-reinforced edge; 13-matrix micro-texture groove. DETAILED DESCRIPTION

[0025] Specific implementation method 1: Combination Figures 1-8 As shown, a friction-reducing indexable milling insert for high-speed feeding and extreme manufacturing conditions is provided. The insert has a hexagonal shape and adopts a structure with a reinforced edge (12); the cutting edge of the insert is provided with a negative rake chamfer (2); the upper and lower surfaces of the insert are provided with a boomerang-shaped boss (8), and the boomerang-shaped boss (8) is provided with a V-shaped cooling groove (9); the inner side of the reinforced edge (12) of the insert and the side edge of the boomerang-shaped boss (8) form a chip groove (5); the tool tip is provided with a A cross arc (11); a sinusoidal micro-texture groove (3) is provided on the front cutting edge (1) near the cutting edge, and a triangular protrusion (10) is provided below the groove; a trapezoidal micro-texture groove (4) parallel to the primary and secondary cutting edges is provided on the front cutting edge (1) near the cutting edge; an arrow-shaped wear-resistant chip-breaking protrusion (6) is provided on the front cutting edge (1); a matrix-shaped micro-texture groove (13) is provided on the primary and secondary flanks of the tool; and a countersunk screw hole (7) for fixing the blade is provided at the geometric center of the blade.

[0026] Specific implementation method 2: Combination Figure 2 、 Figure 3 、 Figure 5 、 Figure 8 As shown, the blade of this embodiment adopts an integral structure, and the blade adopts a hexagonal double-sided design, is provided with six reinforcing edges (12), the height of the reinforcing edge (12) is 1.5mm, after one cutting edge fails, another cutting edge can be quickly replaced to continue processing, thereby improving the blade utilization rate and processing efficiency; the blade body thickness is 5mm, the thickness at the reinforcing edge (12) is 8mm, the blade rake angle γ=12°, the back angle is 0°, and the edge inclination angle is 11°.

[0027] Specific implementation method three: Combined with Figure 3 、 Figure 5 and Figure 8 As shown, the cutting edge of the blade described in this embodiment is provided with a negative rake chamfer (2) with a width b = 0.1 mm and an angle γ0 = 13°, which can improve the distribution of cutting force during processing and reduce cutting temperature; a countersunk screw hole (7) with a diameter of 6 mm is provided at the geometric center of the blade for connection with the cutter head.

[0028] Specific implementation method four: Combination Figure 2 、 Figure 6As shown, the blade tip of the blade in this embodiment is provided with a transition arc (11) with a radius of 0.5 mm; a sinusoidal micro-texture groove (3) is provided near the blade tip on the front cutting edge (1), with a depth of 15 μm, an amplitude of 30 μm, and a period of 100 μm, and a triangular protrusion (10) is provided below the sinusoidal micro-texture groove (3), with a height of 30 μm, which can increase the impact resistance of the blade tip and prevent the tool from being damaged prematurely; trapezoidal micro-texture grooves (4) are provided on both sides of the sinusoidal micro-texture groove (3), with a depth of 15 μm, which can be used to store a small amount of cutting fluid to reduce the wear of the front cutting edge (1).

[0029] Specific implementation method five: Combination Figure 2 、 Figure 4 As shown, the upper and lower surfaces of the blade described in this embodiment are both provided with a boomerang-shaped boss (8), the boss height is 0.1 mm, and a V-shaped cooling groove (9) with a depth of 0.1 mm is provided on the boss, which can improve the heat dissipation capacity of the blade; the side of the boomerang-shaped boss (8) and the inner side of the reinforcing edge (12) form a chip groove (5), and the boomerang-shaped boss (8) can also enhance the overall strength of the blade and improve the impact resistance of the blade.

[0030] Specific implementation method six: combination Figure 2 、 Figure 4 As shown, the front cutting surface (1) of the blade in this embodiment is provided with an arrow-shaped wear-resistant chip-breaking protrusion (6), the direction of the arrow faces the cutting edge, and the height is 15 μm, which can slow down the wear of the front cutting surface (1) and at the same time play a role in strengthening the cutting edge strength and improving the chip-breaking ability.

[0031] Specific implementation method seven: combination Figure 3 、 Figure 7 As shown, the main and secondary flank surfaces of the blade in this embodiment are provided with 5×8 matrix-shaped micro-texture grooves (13) with an outer circle side length of 50 μm, an inner circle side length of 30 μm, a depth of 20 μm, and a spacing of 10 μm, which can reduce the contact area between the blade and the workpiece, reduce the friction between the blade and the workpiece surface, and effectively improve the tool wear.

Claims

1. A reinforced edge anti-friction indexable insert for high-speed feed heavy milling, the insert having a hexagonal shape, characterized in that: The invention adopts a structure with a reinforced edge (12); the cutting edge of the blade is provided with a negative rake chamfer (2); the upper and lower surfaces of the blade are provided with a boomerang-shaped boss (8), and a V-shaped cooling groove (9) is provided above the boss; the inner side of the reinforced edge (12) of the blade and the side of the boomerang-shaped boss (8) form a chip groove (5), and a transition arc (11) is provided at the tip of the tool; a sinusoidal micro-textured groove (3) is provided near the tip of the front blade (1), and a triangular protrusion (10) is provided below the groove; a trapezoidal micro-textured groove (4) parallel to the primary and secondary cutting edges is provided on the front blade (1) of the tool near the tip; an arrow-shaped wear-resistant chip-breaking protrusion (6) is provided on the front blade (1); a matrix-shaped micro-textured groove (13) is provided on the primary and secondary back blades of the tool; and a countersunk screw hole (7) for fixing the blade is provided at the geometric center of the blade.

2. The reinforced edge anti-friction indexable insert for high-speed feed heavy milling according to claim 1, characterized in that: The blade adopts a reinforced edge (12) design, the height of the reinforced edge (12) is 1.5 mm, the thickness of the blade body is 5 mm, the blade rake angle γ is 12°, the back angle is 0°, the edge inclination angle is 11°, and a negative rake angle chamfer (2) design is adopted, the negative chamfer angle γ0 is 13°, and the width b is 0.1 mm.

3. The reinforced edge anti-friction indexable insert for high-speed feed heavy milling according to claim 1, characterized in that: A transition arc (11) is provided at the tip of the tool, and the arc radius is 0.5 mm. A sinusoidal micro-texture groove (3) is provided on the front cutting surface (1) of the tool, and the depth is 15 μm, the amplitude is 30 μm, and the period is 100 μm. A triangular protrusion (10) is provided, and the height is 30 μm. A trapezoidal micro-texture groove (4) is provided, and the depth is 15 μm. A countersunk screw hole (7) with a diameter of 6 mm is provided at the geometric center of the blade.

4. The reinforced edge anti-friction indexable insert for high-speed feed heavy-duty milling according to claim 1, characterized in that: The upper and lower surfaces of the blade are both provided with a boomerang-shaped boss (8) with a boss height of 0.1 mm. The boss is provided with a V-shaped cooling groove (9) with a depth of 0.1 mm. The side edge of the boomerang-shaped boss (8) and the inner side of the reinforcing edge (12) form a chip groove (5).

5. The reinforced edge anti-friction indexable insert for high-speed feed heavy milling according to claim 1, characterized in that: An arrow-shaped wear-resistant chip-breaking protrusion (6) is provided on the front cutting surface (1) of the blade, the arrow direction faces the cutting edge, and the height of the protrusion is 15 μm.

6. The reinforced edge anti-friction indexable insert for high-speed feed heavy milling according to claim 1, characterized in that: The main and auxiliary flank surfaces of the blade are provided with 5×8 matrix-shaped micro-texture grooves (13) with an outer circle side length of 50 μm, an inner circle side length of 30 μm, a depth of 20 μm and a spacing of 10 μm.

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