Spiral groove cutter

Abstract

The utility model discloses a spiral groove cutter which comprises a cutter bar base body, a cutting part located at the front end of the cutter bar base body and a drill tip protruding out of the front end of the cutting part, and a plurality of spiral grooves spirally extending from the front end of the cutting part to a cutter handle part are formed in the cutting part. The drill tip is of a conical structure and comprises a plurality of cutting edges formed around the rotating shaft and grinding chip grooves communicating with the spiral grooves correspondingly. And the cutting edge adopts a superhard sintering layer and is connected with the cutter bar base body through a metal deposition layer. The front end of the drill tip adopts a three-layer structure design, so that the problems that an existing cutter is easy to wear, insufficient in cutting strength, short in service life and the like are solved; the cutting performance of the cutter is ensured due to excellent sharpness and wear resistance of the superhard sintering layer; the metal deposition layer improves the bonding performance between the superhard sintering layer and the cutter bar base body, the interface stress is reduced, and the stability of the whole structure is improved; the cutter bar base body serves as a basic part and provides structural support and mechanical strength for the whole cutter.

Description

Technical Field

[0001] This utility model relates to the field of machining tools, and in particular to a spiral groove cutting tool. Background Technology

[0002] In the field of machining, traditional cutting tools (drills or milling cutters) often suffer from problems such as easy wear of the cutting edge and insufficient cutting sharpness when machining materials with high hardness. Simultaneously, the overall rigidity of the tool is insufficient during machining, making it prone to bending and deformation, directly affecting the tool's stability during processing. These problems not only affect the efficiency and quality of cutting but also shorten the tool's lifespan and increase machining costs. Moreover, traditional cutting tools lack sufficient sharpness and wear resistance of the cutting edge, making it impossible to achieve the combined function of drilling and milling. To overcome these problems, it is necessary to improve traditional cutting tools to meet the precision and efficiency requirements of modern machining; and to realize the industry's pursuit of high-efficiency, multi-functional cutting tools. Utility Model Content

[0003] To solve the above-mentioned technical problems, this utility model provides a spiral groove cutting tool. By designing a three-layer structure at the front end of the drill tip, the cutting performance, wear resistance and service life of the tool at the front end are improved. At the same time, the chip removal groove and the spiral groove are connected by grinding to ensure smooth chip removal.

[0004] The technical solution of this utility model is as follows: it includes a tool bar base, a cutting part located at the front end of the tool bar base, and a drill tip protruding from the front end of the cutting part. The cutting part is provided with a plurality of spiral grooves extending spirally from the front end of the cutting part to the tool holder. The drill tip has a conical structure, including a plurality of cutting edges opened around the rotation axis and a grinding and chip removal groove that is respectively connected to the plurality of spiral grooves. The cutting edges are made of an ultra-hard sintered layer and are connected to the tool bar base through a metal deposition layer.

[0005] Furthermore, two adjacent spiral grooves are connected by a cutting edge band, and the cutting edge band is provided with a radially outward protruding support ligament at its front end along the spiral direction. The support ligament extends spirally from the front end of the cutting part to the tool holder.

[0006] Furthermore, the supporting ligament adopts an ultra-hard sintered layer and is connected to the blade substrate through a metal deposition layer.

[0007] Furthermore: the drill tip includes two sets of cutting edges symmetrical about the rotation axis, and the back faces of the two sets of cutting edges intersect to form a chisel edge.

[0008] Furthermore: the cutting edge includes a regrinding edge and a main cutting edge that extend radially outward from the transverse edge, and the regrinding rake face of the regrinding edge is a circular arc that convexes in the helical direction.

[0009] Furthermore, the flank face of the cutting edge is divided into a first flank face with an ultra-hard sintered layer and a second flank face with the same structure as the tool bar matrix, and the first flank face and the second flank face are connected at a certain angle.

[0010] Furthermore, the front end of the grinding chip removal groove adopts an ultra-hard sintered layer and is connected to the tool bar substrate through a metal deposition layer.

[0011] Furthermore, the front end of the second flank face is made of an ultra-hard sintered layer and is connected to the tool bar substrate through a metal deposition layer.

[0012] The beneficial technical effects of this utility model are as follows: the drill tip adopts an ultra-hard sintered layer and is connected to the tool bar substrate through a metal deposition layer. The ultra-hard sintered layer has excellent sharpness and wear resistance, and (when used as a drill bit) it can directly face the cutting material during drilling, bear the main cutting wear, and ensure the cutting performance of the drill bit; the metal deposition layer is located between the ultra-hard sintered layer and the tool bar substrate, which is used to improve the bonding performance between the ultra-hard sintered layer and the tool bar substrate, reduce interface stress, and improve the stability of the overall structure; the support ligament provides sufficient rigidity for the entire drill bit during deep hole machining, preventing the drill bit from bending as a whole; at the same time, the support ligament adopts an ultra-hard sintered layer, which ensures the sharpness of the cutting edge (when used as a milling cutter) for milling, realizing efficient and high-precision cutting, and the drill tip structure at the end makes the tool also have a certain drilling capability, realizing composite machining requirements. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the specific structure of the drill tip of this utility model;

[0015] Figure 3 This is a schematic diagram showing the location of the ultra-hard sintered layer in this utility model;

[0016] Figure 4 This is a schematic diagram showing the location of the metal deposition layer in this utility model;

[0017] Among them: HS, ultra-hard sintered layer; MD, metal deposition layer;

[0018] 1. Cutting section; 11. Spiral groove; 12. Cutting edge band; 2. Tool holder; 3. Drill tip; 31. Rake face; 311. First rake face; 312. Second rake face; 32. Grinding edge; 321. Grinding rake face; 322. Grinding cutting edge; 33. Main cutting edge; 331. Main cutting rake face; 332. Main cutting edge; 34. Chisel edge; 4. Support ligament. Detailed Implementation

[0019] In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0020] Figure 1 and Figure 2 As shown, the present invention discloses a spiral groove cutting tool, which can be used as a drill bit to drill holes of different diameters, depths and precision requirements in metal, or to process existing holes to meet the size and precision requirements of the holes; the tool can also be used as a milling cutter to perform planar milling, groove milling and other operations on metal in CNC machine tools; the tool includes a tool bar base, a cutting part 1 located at the front end of the tool bar base, a tool holder part 2 located at the rear end of the tool bar base, and a drill tip 3 protruding from the front end of the cutting part 1.

[0021] Example 1

[0022] In this embodiment 1, when the tool is used as a drill bit, the cutting part 1 is provided with two spiral grooves 11 extending spirally from the front end of the cutting part 1 to the tool holder part 2 for discharging chips. The cutting part 1 is also provided with cutting edge bands 12 that connect the outer periphery of adjacent spiral grooves 11. The drill tip 3 includes two sets of cutting edges symmetrical about the rotation axis. The drill tip 3 is a conical structure formed by the intersection of the flank faces 31 of the two sets of cutting edges, and a chisel edge 34 is formed at the connection of the two flank faces 31.

[0023] The cutting edge includes a re-grinding edge 32 extending radially outward from the chisel edge 34 and a main cutting edge 33. The re-grinding edge 32 includes, in a helical direction, a re-grinding rake face 321, a re-grinding cutting edge 322, and a flank face 31, wherein the re-grinding rake face 321 is a circular arc protruding in the helical direction. During the cutting process, the circular arc-shaped re-grinding rake face 321 allows the chips to curl more smoothly, reducing the pressure of the chips on the re-grinding edge 32, thereby improving cutting efficiency.

[0024] Along the spiral direction, in front of the 321 cutting face before shaving, the chip removal groove and the shaving surface are connected in sequence by a transition arc surface. The chip removal groove and the shaving surface are interconnected with the spiral groove 11 to form a complete chip removal path.

[0025] The main cutting edge 33 extends from the end of the grinding edge 32 to the cutting edge band 12, and includes, in sequence along the helical direction, the main cutting edge rake face 331, the main cutting edge 332, and the flank face 31.

[0026] Furthermore, the cutting edge 12 is provided with a radially outward protruding support ligament 4 at the front end along the helical direction. The support ligament 4 extends spirally from the front end of the cutting part 1 to the tool holder part 2 to effectively enhance the overall rigidity of the drill bit and prevent the drill bit from bending and deforming when machining materials with high hardness or performing deep hole machining. At the same time, the support ligament 4 comes into contact and rubs against the hole wall during the cutting process of the drill bit. This contact can play a stabilizing and balancing role for the drill bit, ensuring that the drill bit maintains good stability during the drilling process, thereby ensuring the quality of drilling.

[0027] In this embodiment 1, as Figure 3 and Figure 4 The support ligament 4 is made of an ultra-hard sintered layer HS and has a polycrystalline diamond structure. This polycrystalline diamond structure is formed by sintering under high temperature and high pressure and fixed to the rear edge of the spiral groove 11. The ultra-hard properties of polycrystalline diamond give the support ligament 4 extremely high hardness and wear resistance, providing strong support and protection for the drill bit.

[0028] A metal deposition layer MD is also provided between the tool bar substrate and the ultra-hard sintered layer HS. The metal deposition layer MD can not only reduce the interfacial stress between the tool bar substrate and the ultra-hard sintered layer HS, but also improve the bonding interface between the two, increase the bonding strength, make the drill bit more stable during the cutting process, and extend the service life of the drill bit.

[0029] Furthermore, the cutting edge employs an ultra-hard sintered layer HS and is connected to the tool bar substrate via a metal deposition layer MD, ensuring high hardness and wear resistance of the cutting edge. The cutting edge extends outward in the radial direction and connects with the supporting ligament 4 to form an organic whole.

[0030] The flank face 31 is divided into a first flank face 311 with an ultra-hard sintered layer HS and a second flank face 312 with the same structure as the tool bar matrix. The first flank face 311 and the second flank face 312 are connected at a certain angle, so that the drill bit can make full use of the wear resistance and high temperature resistance of the first flank face 311 during operation to maintain the cutting performance of the drill bit; and the second flank face 312 can provide the necessary toughness.

[0031] Furthermore, the front end of the second flank face 312 connected to the drill tip 3 and the front end of the chip removal groove are both configured with a three-layer structure, consisting of an ultra-hard sintered layer HS, a metal deposition layer MD, and a cutting rod substrate, arranged sequentially from the front end towards the shank 2. This three-layer structure further enhances the performance of the drill bit in the critical area of ​​the drill tip 3.

[0032] Example 2

[0033] In this embodiment 2, when the tool is used as a milling cutter, the structure of the milling cutter is the same as that in embodiment 1. The difference is that in the milling cutter structure, the supporting ligament 4 not only enhances the overall rigidity of the tool and prevents the tool from bending and deforming during machining, but also serves as the main cutting part. Moreover, its three-layer structure design can ensure the sharpness and wear resistance of the cutting edge, achieving efficient and high-precision cutting. At the same time, the drill tip structure design of the milling cutter covers the composite function of the milling cutter, which can both mill and drill, enabling multiple machining processes to be completed on one tool. There is no need to change tools during machining, resulting in higher efficiency.

[0034] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A spiral groove cutting tool, characterized in that: The tool includes a tool base, a cutting section (1) located at the front end of the tool base, a tool holder section (2) located at the rear end of the tool base, and a drill tip (3) protruding from the front end of the cutting section (1). The cutting section (1) is provided with a plurality of spiral grooves (11) extending spirally from the front end of the cutting section (1) to the tool holder section (2). The drill tip (3) has a conical structure and includes a plurality of cutting edges opened around the rotation axis and a grinding chip removal groove that communicates with the plurality of spiral grooves (11). The cutting edges are made of an ultra-hard sintered layer (HS) and are connected to the tool base through a metal deposition layer (MD).

2. The spiral groove cutting tool according to claim 1, characterized in that: Two adjacent spiral grooves (11) are connected by a cutting edge band (12). The cutting edge band (12) has a radially outward protruding support ligament (4) at its front end along the spiral direction. The support ligament (4) extends spirally from the front end of the cutting part (1) to the tool holder part (2).

3. A spiral groove cutting tool according to claim 2, characterized in that: The supporting ligament (4) is made of an ultra-hard sintered layer (HS) and is connected to the blade substrate through a metal deposition layer (MD).

4. A spiral groove cutting tool according to claim 1, characterized in that: The drill tip (3) includes two sets of cutting edges symmetrical about the rotation axis, and the back face (31) of the two sets of cutting edges intersect to form a chisel edge (34).

5. A spiral groove cutting tool according to claim 4, characterized in that: The cutting edge includes a grinding edge (32) extending radially outward from the transverse edge (34) and a main cutting edge (33). The grinding rake face (321) of the grinding edge (32) is a circular arc protruding in the spiral direction.

6. A spiral groove cutting tool according to claim 1, characterized in that: The flank face (31) of the cutting edge is divided into a first flank face (311) with an ultra-hard sintered layer (HS) and a second flank face (312) with the same structure as the tool bar substrate. The first flank face (311) and the second flank face (312) are connected at a certain angle.

7. A spiral groove cutting tool according to claim 1, characterized in that: The front end of the grinding chip removal groove is made of an ultra-hard sintered layer (HS) and is connected to the tool bar substrate through a metal deposition layer (MD).

8. A spiral groove cutting tool according to claim 6, characterized in that: The front end of the second flank face (312) is made of an ultra-hard sintered layer (HS) and is connected to the tool bar substrate through a metal deposition layer (MD).

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