Numerical control blade with optimized chip breaker groove structure

Abstract

The utility model discloses a numerical control blade with broken chip groove optimization structure, including blade base body, the cutting edge one side of blade base body is provided with broken chip groove, the broken chip groove extends along the cutting edge length direction and total length is equal with cutting edge, the broken chip groove includes introduction section, transition section and broken chip section, introduction section, transition section and broken chip section are smooth in proper order and connect, and the slot width of three is consistent, the cross section of introduction section is the outer convex arc, transition section is the plane that leans to the inside of blade base body, the slot bottom of broken chip section is equipped with 3 even interval distribution's broken chip boss, the utility model discloses the total length of broken chip groove is completely consistent with cutting edge, and each subsection length proportion is reasonable, avoids the structure interference, ensures that the chip whole course along cutting edge corresponding path and exports, the synergies of introduction section arc design and transition section lean structure, ensure that the chip along the preset path and export smoothly, do not scratch workpiece surface, promote the machining accuracy.

Description

Technical Field

[0001] This utility model relates to the field of cutting tool technology, specifically a CNC insert with an optimized chip breaker structure. Background Technology

[0002] CNC inserts are core components in CNC machining, and their chip-breaking performance directly affects machining accuracy, efficiency, and tool life. The chip breaker groove, as a key structure for chip breaking in CNC inserts, is crucial; its design rationality (including dimensional matching and structural form) determines the chip shape and removal effect.

[0003] Existing CNC inserts often feature chip breaker grooves with a single arc or trapezoidal structure, frequently exhibiting problems such as a mismatch between the total length of the chip breaker groove and the cutting edge length, and an imbalance in the segment size ratio. This leads to: firstly, unstable chip breaker performance, making it difficult to achieve uniform chip breakering for workpieces with varying hardness and toughness (e.g., steel, aluminum, cast iron); secondly, poor chip guidance, easily resulting in chip entanglement in the tool and scratching the workpiece surface; and thirdly, insufficient compatibility between the chip breaker groove structure and the insert substrate, exacerbating groove wall wear and shortening insert life. Therefore, it is necessary to synergistically optimize the structural form and dimensional parameters of the chip breaker groove to solve these technical problems. Utility Model Content

[0004] The purpose of this invention is to provide a CNC cutting tool with an optimized chip breaker groove structure to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a CNC insert with an optimized chip breaker groove structure, comprising an insert base, wherein a chip breaker groove is provided on one side of the cutting edge of the insert base, the chip breaker groove extends along the length direction of the cutting edge and the total length is equal to that of the cutting edge; the chip breaker groove includes an inlet section, a transition section and a chip breaker section, the inlet section, the transition section and the chip breaker section are smoothly connected in sequence, and the groove width of the three is the same; the cross-section of the inlet section is an outwardly convex arc shape, the transition section is a plane inclined inward to the insert base, and the bottom of the chip breaker section is provided with three evenly spaced chip breaker protrusions, the top of the chip breaker protrusions is a sharp end, and they are arranged along the extension direction of the chip breaker groove.

[0006] Preferably, the arc radius of the guide section is 1.2-1.8mm, the length of the guide section is 1.0-2.0mm, and the connection between the guide section and the cutting edge is provided with a rounded corner with a radius of 0.1-0.3mm.

[0007] Preferably, the angle between the transition section and the upper surface of the blade substrate is 35-45°, the length of the transition section is 3.0-4.0 mm, and the length of the transition section accounts for 1 / 3-1 / 2 of the total length of the chip breaker groove.

[0008] Preferably, the length of the chip-breaking segment is 4.5-5.5 mm, the height of the chip-breaking boss is 0.8-1.2 mm, the width of the chip-breaking boss itself is 1.0-1.5 mm, the distance between two adjacent chip-breaking bosses is 1.0-2.0 mm, and the included angle of the sharp end of the chip-breaking boss is 30-45°.

[0009] Preferably, the chip breaker groove has a width of 2.0-3.0 mm, a depth of 1.0-1.5 mm, and a wall roughness Ra≤0.8 μm.

[0010] Preferably, the blade substrate is made of cemented carbide material, and the cutting edge area of ​​the blade substrate is coated with TiAlN with a coating thickness of 3-5 μm.

[0011] Preferably, the blade base has a polygonal structure with a mounting hole at its center, and the chip breaker groove is correspondingly provided on the inner side of each cutting edge of the blade base.

[0012] Compared with the prior art, the beneficial effects of this utility model are: 1. Strong size matching: The total length of the chip breaker groove is completely consistent with the cutting edge, and the length ratio of each segment is reasonable, avoiding structural interference and ensuring that the chips are discharged along the corresponding path of the cutting edge throughout the entire process; 2. Strong chip breaking stability: Multiple triangular chip breaking bosses are evenly distributed, and with the segmented guide structure, it can achieve uniform chip breaking for workpieces of various materials such as steel, stainless steel, aluminum alloy, and cast iron. The chip length is controlled at 4-8mm, the chip breaking rate is high, and long chip entanglement is completely avoided. 3. Good guidance: The combined effect of the arc design of the inlet section and the inclined structure of the transition section ensures that the chips are smoothly discharged along the preset path, without scratching the workpiece surface and improving the machining accuracy; 4. Long service life: The low roughness design of the groove wall reduces friction and wear, and the TiAlN coating enhances the hardness and high temperature resistance of the blade, resulting in a significantly longer service life compared to traditional blades; 5. Wide adaptability: It can meet various machining methods such as turning and milling, and has strong versatility. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a partial cross-sectional view of the present invention. Figure 3 This is a top view of the structure of this utility model.

[0014] In the diagram: 1. Insert base; 2. Cutting edge; 3. Chip breaker groove; 31. Inlet section; 32. Transition section; 33. Chip breaker section; 4. Fillet; 5. Chip breaker boss. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Please see Figure 1-3 This utility model provides a technical solution: a CNC insert with an optimized chip breaker groove structure, including an insert base 1, a chip breaker groove 3 is provided on one side of the cutting edge 2 of the insert base 1, the chip breaker groove 3 extends along the length direction of the cutting edge 2 and the total length is equal to that of the cutting edge 2, to ensure structural fit, without exceeding or falling short; the chip breaker groove 3 includes an inlet section 31, a transition section 32 and a chip breaker section 33, the inlet section 31, the transition section 32 and the chip breaker section 33 are smoothly connected in sequence, and the groove width of the three is the same, to avoid chips getting stuck at the segment connection; The inlet section 31 has a convex arc shape in cross-section, with an arc radius of 1.2-1.8 mm and a length of 1.0-2.0 mm. A fillet 4 with a radius of 0.1-0.3 mm is provided at the connection between the inlet section 31 and the cutting edge 2. This arc-shaped structure, combined with its reasonable length, smoothly guides the chips into the chip breaker groove 3, reducing impact wear between the chips and the groove wall, while also preventing the inlet section 31 from occupying too much space in the chip breaker section 33.

[0017] The transition section 32 is a plane inclined inwards towards the blade base 1. The angle between the transition section 32 and the upper surface of the blade base 1 is 35-45°. The length of the transition section 32 is 3.0-4.0 mm, and the length of the transition section 32 accounts for 1 / 3-1 / 2 of the total length of the chip breaker groove 3. The inclined plane realizes the gradient guidance of the chips, smoothly transitioning the chips introduced by the inlet section 31 to the chip breaker section 33, avoiding chip accumulation or displacement.

[0018] The bottom of the chip-breaking section 33 is provided with three evenly spaced chip-breaking protrusions 5. The tops of the chip-breaking protrusions 5 are sharp and they are arranged along the extension direction of the chip-breaking groove 3. The length of the chip-breaking section 33 is 4.5-5.5 mm, the height of the chip-breaking protrusions 5 is 0.8-1.2 mm, the width of the chip-breaking protrusions 5 is 1.0-1.5 mm, the distance between two adjacent chip-breaking protrusions 5 is 1.0-2.0 mm, and the included angle between the sharp ends of the chip-breaking protrusions 5 is 30-45°. Through the even distribution of the three protrusions, a stable mechanical barrier is formed within a limited length, forcing the chips to break into short chips, while avoiding chip clogging caused by excessively dense protrusions.

[0019] Furthermore, the chip breaker groove 3 has a groove width of 2.0-3.0 mm and a groove depth of 1.0-1.5 mm. The groove wall roughness Ra of the chip breaker groove 3 is ≤0.8 μm, which reduces the frictional resistance between the chip and the groove wall. The insert substrate 1 is made of cemented carbide material. The cutting edge 2 area of ​​the insert substrate 1 is coated with TiAlN with a coating thickness of 3-5 μm to improve wear resistance and high temperature resistance. The insert substrate 1 has a polygonal structure with a mounting hole in the center. The chip breaker groove 3 is correspondingly set on the inner side of each cutting edge 2 of the insert substrate 1 to adapt to multi-edge cutting requirements.

[0020] Specifically, during use, the chips generated by the contact between the cutting edge 2 and the workpiece are smoothly guided (without impact) through the arc-shaped surface of the guide section 31. Under the guidance of the inclined plane of the transition section 32, they flow precisely to the chip breaking section 33. The sharp ends of the three chip breaking bosses 5 form a uniform mechanical obstruction to the chips, causing the chips to break along the gap between the bosses, forming short chips that are smoothly discharged, avoiding entanglement of the tool or scratching of the workpiece.

[0021] The CNC inserts in this embodiment have been tested and found to achieve a chip breaking rate of 99% when machining 45# steel (1200 r / min, feed rate 0.2 mm / r), 304 stainless steel (800 r / min, feed rate 0.15 mm / r), and ADC12 aluminum alloy (2000 r / min, feed rate 0.3 mm / r), with a surface roughness Ra≤0.8 μm. The insert life is extended by 35% compared to traditional inserts.

[0022] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A CNC cutting tool with an optimized chip breaker groove structure, comprising a cutting tool body (1), characterized in that: The cutting edge (2) of the blade base (1) is provided with a chip breaking groove (3) on one side. The chip breaking groove (3) extends along the length direction of the cutting edge (2) and the total length is equal to that of the cutting edge (2). The chip breaking groove (3) includes an inlet section (31), a transition section (32) and a chip breaking section (33). The inlet section (31), the transition section (32) and the chip breaking section (33) are connected smoothly in sequence, and the groove width of the three is the same. The cross section of the inlet section (31) is convex arc-shaped. The transition section (32) is a plane that is inclined to the inside of the blade base (1). The bottom of the groove of the chip breaking section (33) is provided with three chip breaking bosses (5) that are evenly spaced. The top of the chip breaking bosses (5) is a sharp end and they are arranged along the extension direction of the chip breaking groove (3).

2. The CNC cutting tool with an optimized chip breaker groove structure according to claim 1, characterized in that: The radius of the arc of the inlet section (31) is 1.2-1.8 mm, the length of the inlet section (31) is 1.0-2.0 mm, and the connection between the inlet section (31) and the cutting edge (2) is provided with a fillet (4) with a radius of 0.1-0.3 mm.

3. The CNC cutting tool with an optimized chip breaker groove structure according to claim 1, characterized in that: The angle between the transition section (32) and the upper surface of the blade substrate (1) is 35-45°, the length of the transition section (32) is 3.0-4.0 mm, and the length of the transition section (32) accounts for 1 / 3-1 / 2 of the total length of the chip breaker groove (3).

4. The CNC cutting tool with an optimized chip breaker groove structure according to claim 1, characterized in that: The length of the chip-breaking segment (33) is 4.5-5.5 mm, the height of the chip-breaking boss (5) is 0.8-1.2 mm, the width of the chip-breaking boss (5) itself is 1.0-1.5 mm, the distance between two adjacent chip-breaking bosses (5) is 1.0-2.0 mm, and the included angle of the sharp end of the chip-breaking boss (5) is 30-45°.

5. A CNC cutting tool with an optimized chip breaker groove structure according to claim 1, characterized in that: The chip breaking groove (3) has a groove width of 2.0-3.0 mm, a groove depth of 1.0-1.5 mm, and a groove wall roughness Ra≤0.8 μm.

6. A CNC cutting tool with an optimized chip breaker groove structure according to claim 1, characterized in that: The blade substrate (1) is made of cemented carbide material, and the cutting edge (2) area of ​​the blade substrate (1) is coated with TiAlN with a coating thickness of 3-5μm.

7. A CNC cutting tool with an optimized chip breaker groove structure according to claim 1, characterized in that: The blade base (1) has a polygonal structure with a mounting hole at its center. The chip breaker groove (3) is provided on the inner side of each cutting edge (2) of the blade base (1).

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