Welded integral PCD spiral blade milling cutter
By welding the whole PCD spiral edge milling cutter and combining the carbide cutter body with the PCD cutter head, the problems of fast wear and vibration of traditional spiral edge milling cutters are solved, and efficient and stable high-speed cutting effects are achieved.
Patent Information
- Application Number
- CN202511155287.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-18
- Publication Date
- 2025-09-26
AI Technical Summary
Traditional carbide spiral-edged milling cutters are prone to wear during high-speed cutting, cutting heat causes cutting edge chipping, and are prone to vibration, affecting machining accuracy and efficiency.
A welded integral PCD spiral edge milling cutter is used, which combines a carbide cutter body with a PCD cutter head. The PCD cutter head has a spiral cutting edge designed to be centrally symmetrically distributed, and is equipped with a chip groove and a chip guide groove to optimize cutting heat dissipation and chip discharge.
It improves the wear resistance and impact resistance of the tool, extends its service life, reduces vibration, ensures processing accuracy and efficiency, and is suitable for high-speed cutting.
Smart Images
Figure CN120696473A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of milling cutters, and in particular to a welded integral PCD spiral edge milling cutter. Background Art
[0002] Spiral-edged milling cutters are key tools in the field of mechanical processing for high-speed and large-allowance milling of metals and other materials. They achieve efficient cutting and shaping of the workpiece surface through spiral cutting edges and are widely used in high-precision processing scenarios such as aerospace, automobile manufacturing, etc.
[0003] At present, the mainstream spiral edge milling cutters in the industry are mostly carbide-faced spiral edge milling cutters, which rely on the hardness of the carbide material to achieve cutting function. The cutting edges of these spiral edge milling cutters are integrally machined on the cutter body, and the structural dimensions of multiple cutting edges are the same. This type of spiral edge milling cutter has the following obvious defects in the high-speed and large-allowance milling process: 1. Carbide-based spiral-edge milling cutters are prone to generating a large amount of cutting heat during high-speed cutting, causing localized temperature increases. In high-temperature environments, the hardness and wear resistance of the carbide decrease dramatically, and the cutting edge is prone to thermochemical wear, resulting in rapid edge chipping and shortening the tool life. Rapid cutting edge wear directly reduces the dimensional accuracy of the workpiece and affects product quality, requiring frequent tool replacement. Frequent tool replacement not only reduces processing efficiency, but also increases the operator's workload and restricts production continuity.
[0004] 2. The cutting edges of the spiral milling cutter are evenly distributed around the cutter body. During high-speed cutting, it is easy to cause tool vibration, which increases the processing error. Summary of the Invention
[0005] In view of this, the object of the present invention is to provide a welded integral PCD spiral edge milling cutter to solve the technical problems of fast wear speed and low processing efficiency of traditional spiral edge milling cutters.
[0006] In order to solve the above problems, the present invention provides a welded integral PCD spiral edge milling cutter adopting the following technical solutions: A welded integral PCD spiral-edged milling cutter comprises a carbide cutter body, and also comprises a first PCD cutter head and a second PCD cutter head welded to the carbide cutter body. Two first PCD cutter heads are provided, each having a first spiral cutting edge, and the two first PCD cutter heads are centrally symmetrically distributed about the rotation center of the carbide cutter body. The second PCD cutter head penetrates the carbide cutter body, and the second PCD cutter head has two second spiral cutting edges that pass through the rotation center and are centrally symmetrically distributed about the rotation center. The first spiral cutting edge and the second spiral cutting edge both comprise a side milling edge portion for side milling and an end milling edge portion for end milling. The carbide cutter body is provided with a spiral chip groove on the side of each PCD cutter head. The beneficial effects of the welded integral PCD spiral-edged milling cutter of the present invention are as follows: the present invention uses a high-impact cemented carbide as the cutter body to ensure the stability of the overall structure, and uses a PCD cutter head welded to the cemented carbide body, which gives the spiral cutting edge wear resistance and heat resistance far exceeding that of cemented carbide. This reduces the wear rate of the blade at the material level, increases the service life of the milling cutter, and ensures the stability of the dimensional tolerance of the workpiece. The high impact resistance of the cemented carbide body combined with the high hardness of the PCD blade enables the entire milling cutter to maintain structural stability at high speeds, and prevents the blade from cracking due to centrifugal force or excessive cutting force. In addition, the spiral trajectory allows cutting heat to be quickly discharged along the chip groove, avoiding thermochemical wear caused by heat accumulation on the blade. Furthermore, the spiral cutting edges of traditional spiral milling cutters are evenly distributed and do not pass through the center of rotation of the tool. They are mostly suitable for side milling of workpieces. The material in the center area of the workpiece cannot be directly removed by the cutting edge. The two PCD cutter heads in the present invention both include side milling blades and end milling blades, which can take into account both side milling and end milling at the same time. In addition, the two second spiral cutting edges pass through the center of rotation and are distributed symmetrically in the center, which can effectively and synchronously process the center area of the workpiece and improve processing efficiency.
[0007] Furthermore, the effective length of the side milling edge portion of the first spiral cutting edge involved in cutting is greater than the effective length of the side milling edge portion of the second spiral cutting edge involved in cutting, and the effective length of the end milling edge portion of the first spiral cutting edge involved in cutting is less than the effective length of the end milling edge portion of the second spiral cutting edge involved in cutting.
[0008] Beneficial effect: Layered cutting processing is achieved through differentiated length design, that is, the first spiral cutting edge is mainly responsible for side milling and partial end milling of a large area on the periphery of the workpiece, and the second spiral cutting edge, because it passes the rotation center, focuses on large-area cutting and partial outer diameter side milling in the center area of the workpiece. This division of labor reasonably distributes the cutting load, avoids overload of cutting on a single blade, and ensures the processing efficiency of the central and peripheral areas.
[0009] Furthermore, the helix angle of the first helical cutting edge is within a range of 10° to 20°, and the helix angle of the second helical cutting edge is within a range of 10° to 20°.
[0010] Beneficial effects: PCD has good physical heat dissipation effect and can quickly absorb cutting heat. The smaller helix angle improves the strength of PCD material and the impact load resistance of PCD blade while meeting the sharpness and heat dissipation of PCD blade, thus avoiding blade wear and chipping due to excessive force. It is also conducive to the discharge of chips in the spiral direction, and cooperates with the chip groove to improve chip removal efficiency, reduce the generation of built-up edge, and reduce cutting heat accumulation.
[0011] Furthermore, the rotation diameters of the side milling edge portions of the first spiral cutting edge and the second spiral cutting edge are both larger than the diameter of the cemented carbide cutter body.
[0012] Beneficial effect: During cutting, only the first spiral cutting edge and the second spiral cutting edge are in contact with the workpiece. The carbide cutter body does not participate in cutting and always maintains a gap with the workpiece, thus avoiding the carbide cutter body from scratching the workpiece surface, ensuring the surface processing quality of the workpiece, and extending the service life of the carbide cutter body.
[0013] Furthermore, a first cutter head positioning and mounting groove is provided on the groove wall of two oppositely arranged chip grooves, and the two first PCD cutter heads are respectively welded at the corresponding first cutter head positioning and mounting grooves; a second cutter head positioning groove is provided on the carbide tool body and passes through the other two oppositely arranged chip grooves, the second cutter head positioning groove extends radially along the carbide tool body and passes through the rotation center, and the second PCD tool head is welded in the second cutter head positioning groove.
[0014] Beneficial effect: The structural design of the first cutter head positioning and mounting groove and the second cutter head positioning and clamping groove ensures the installation accuracy and stability of the first PCD cutter head, avoids the cutter head from loosening or falling off during high-speed cutting, and improves the reliability of the tool.
[0015] Preferably, the first PCD cutter head has a first rake face and a first flank face, and the connecting position of the first rake face and the first flank face forms the first spiral cutting edge, and the first rake face is a spiral surface processed by an electric spark CNC grinder and matched with the spiral chip groove, so that after the first PCD cutter head is installed, the first rake face and the groove wall of the spiral chip groove extend spirally along the same angle; the second PCD cutter head has two second rake faces and two second flank faces, and the connecting position of the second rake face and the corresponding second flank face forms the second spiral cutting edge, and the second rake face is a spiral surface processed by an electric spark CNC grinder and matched with the spiral chip groove, so that after the second PCD cutter head is installed, the second rake face and the groove wall of the spiral chip groove extend spirally along the same angle.
[0016] Beneficial effects: Due to the material of PCD itself, the rake face of the existing PCD cutter head is mostly flat, which does not match the spiral angle of the spiral chip groove after the PCD cutter head is installed. During cutting, the chips are not easy to be discharged along the spiral chip groove and accumulate, and during cutting, the cutting edge and the workpiece are in line contact, resulting in greater cutting resistance; the rake faces of the first PCD cutter head and the second PCD cutter head in the present invention are both spiral surfaces and match the spiral chip groove. During processing, the blade is in point contact with the workpiece, the cutting resistance is smaller, and the chips are more likely to form a spiral curl and be discharged from the spiral chip groove along the spiral direction, which is not easy to accumulate, thereby achieving rapid dissipation of cutting heat to protect the spiral cutting edge.
[0017] Furthermore, two second chip guide grooves respectively connected to the corresponding chip grooves are formed between the second PCD cutter head and the cemented carbide cutter body.
[0018] Beneficial effect: The chips generated by the second spiral cutting edge in the center area can be quickly introduced into the chip groove through the second chip guide groove, thereby enhancing the chip removal capacity of the center area, avoiding the increase in cutting heat and machining resistance caused by chip accumulation in the center area, and ensuring the stability and accuracy of machining in the center area.
[0019] Furthermore, a first chip guide groove communicating with the corresponding chip groove is provided at the end of the cemented carbide tool body at a position corresponding to the first PCD tool head.
[0020] Beneficial effect: The chips generated by the first spiral cutting edge during end milling or side milling can be introduced into the chip groove through the first chip guide groove, further optimizing the chip removal path, reducing the accumulation of chips on the blade to form built-up edge, and improving the quality of the machined surface.
[0021] Furthermore, in the axial direction of the cemented carbide tool body, the outer diameter length of the first helical cutting edge is 2 to 5 times the outer diameter length of the second helical cutting edge. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 Schematic diagram of the three-dimensional structure of the welded integral PCD spiral edge milling cutter of the present invention Figure 1 ; Figure 2 Schematic diagram of the three-dimensional structure of the welded integral PCD spiral edge milling cutter of the present invention Figure 1 ; Figure 3 A front view of the welded integral PCD spiral edge milling cutter of the present invention from one perspective; Figure 4 A front view of the welded integral PCD spiral edge milling cutter of the present invention from another perspective; Figure 5 A side view of the welded integral PCD spiral edge milling cutter of the present invention; Figure 6 Schematic diagram of the three-dimensional structure of the carbide cutter body of the welded integral PCD spiral edge milling cutter of the present invention; Figure 7 Schematic diagram of the three-dimensional structure of the first PCD cutter head of the welded integral PCD spiral edge milling cutter of the present invention; Figure 8 A schematic diagram of the three-dimensional structure of the second PCD cutter head of the welded integral PCD spiral edge milling cutter of the present invention; Figure 9 This is a cutting thermal analysis comparison diagram of the welded integral PCD spiral edge milling cutter of the present invention.
[0023] Description of reference numerals: 1. Carbide cutter body; 11. Spiral chip groove; 12. First cutter head positioning and mounting groove; 13. Second cutter head positioning slot; 14. Second chip guide groove; 15. First chip guide groove; 2. First PCD cutter head; 21. First spiral cutting edge; 211. First side milling edge; 212. First end milling edge; 213. First rake face; 214. First flank face; 3. Second PCD cutter head; 31. Second spiral cutting edge; 311. Second side milling edge; 312. Second end milling edge; 3121. Chisel edge; 313. Second rake face; 314. Second flank face. DETAILED DESCRIPTION
[0024] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.
[0025] The principles and spirit of the present invention are explained in detail below with reference to several representative embodiments of the present invention.
[0026] An embodiment of a welded integral PCD spiral edge milling cutter provided by the present invention: like Figure 1 and Figure 2 As shown, the welded integral PCD spiral edge milling cutter comprises a cemented carbide tool body 1 and a first PCD tool head 2 and a second PCD tool head 3 welded on the cemented carbide tool body 1 .
[0027] Specifically, for ease of description, the end of the carbide tool body 1 for mounting the PCD tool head is defined as its front end. Figure 6 As shown, there are four spiral chip grooves 11 evenly distributed in the circumferential direction of the cemented carbide tool body 1. Among the four spiral chip grooves 11, two spiral chip grooves 11 arranged opposite to each other are centrally symmetrically distributed about the rotation center of the cemented carbide tool body 1. In this embodiment, the groove walls of the two oppositely arranged spiral chip grooves 11 are each provided with a first cutter head positioning and mounting groove 12. The groove wall surface of the first cutter head positioning and mounting groove 12 is in close contact with the corresponding cutting surface of the first PCD cutter head 2 to achieve precise welding. The structure of the first PCD cutter head 2 is similar to that of the embodiment shown in FIG. Figure 3 、 Figure 4 and Figure 7As shown, the first PCD cutter head 2 has a first rake face 213 and a first flank face 214. The junction of the first rake face 213 and the first flank face 214 forms a first spiral cutting edge 21. The first rake face 213 is a spiral surface machined by an electric spark CNC grinder and matched with the spiral chip groove 11, so that after the first PCD cutter head 2 is installed, the first rake face 213 and the groove wall surface of the spiral chip groove 11 extend spirally along the same angle, that is, the first rake face 213 and the corresponding spiral surface of the spiral chip groove 11 form a curved surface, which extends spirally along the set helical angle. The helical angle of the first spiral cutting edge 21 is 10°~20°, and the helical angle here refers to the helical angle of the first rake face 213. The first spiral cutting edge 21 has a first side milling blade portion 211 for side milling and a first end milling blade portion 212 for end milling. As shown Figure 5 As shown, the first spiral cutting edges 21 of the two first PCD cutter heads 2 do not pass through the above-mentioned rotation center, but are still centrally symmetrically distributed about the rotation center.
[0028] like Figure 6 As shown, the cemented carbide tool body 1 is further provided with a second tool head positioning groove 13 that passes through the other two oppositely arranged spiral chip grooves 11. The second tool head positioning groove 13 extends radially along the cemented carbide tool body 1 and is a through groove. The groove wall surfaces are all planes for fitting with the corresponding surfaces of the second PCD tool head 3, which can quickly realize the positioning and installation of the second PCD tool head 3. The second tool head positioning groove 13 passes through the rotation center of the cemented carbide tool body 1.
[0029] The second PCD cutter head 3 is an integrated structure. Figure 3 and Figure 8 As shown, the second PCD cutter head 3 has two second rake faces 313 and two second flank faces 314. The connecting position of the second rake face 313 and the corresponding second flank face 314 forms a second spiral cutting edge 31, that is, the second PCD cutter head 3 has two second spiral cutting edges 31, and the two second spiral cutting edges 31 are centrally symmetrically distributed about the center of rotation. The second rake face 313 is a spiral surface machined by an EDM CNC grinder and matched with the spiral chip groove 11, so that after the second PCD cutter head 3 is installed, the second rake face 313 and the groove wall surface of the spiral chip groove 11 extend spirally at the same angle. The helix angle of the second spiral cutting edge 31 is also between 10° and 20°. The helix angle here refers to the helix angle of the second rake face 313. As shown Figure 5As shown, after the second PCD cutter head 3 is installed, the second spiral cutting edge 31 passes through the center of rotation. At this point, the two first spiral cutting edges 21 and the two second spiral cutting edges 31 are arranged at alternating 90° angles along the circumference of the carbide cutter body 1. In actual manufacturing, the helix angle of the second spiral cutting edge 31 is the same as that of the first spiral cutting edge 21 and the spiral receiving groove 11. Because PCD is hard and can quickly absorb cutting heat, a smaller helix angle range is used, considering the complexity of the machining process. This ensures the strength of the PCD material while maintaining the sharpness and heat dissipation of the tool's PCD cutting edge, improves the PCD cutting edge's resistance to impact loads, and prevents wear and chipping due to excessive force. It also facilitates the helical discharge of chips, which, in conjunction with the chip flute, improves chip removal efficiency, reduces built-up edge, and reduces cutting heat accumulation. It should be noted that the helix angles of the second spiral cutting edge 31, the first spiral cutting edge 21, and the spiral receiving groove 11 can be appropriately designed based on actual needs.
[0030] The surface of the second PCD cutter head 3 for cooperating with the second cutter head positioning slot 13 is flat. When installed, it is stuck in the second cutter head positioning slot 13 and is tightly attached and welded to the corresponding side groove wall of the second cutter head positioning slot 13. At this time, the second spiral cutting edge 31 passes through the rotation center of the cemented carbide cutter body 1. In this embodiment, the second spiral cutting edge 31 on each side includes a second side milling blade portion 311 for side milling and a second end milling blade portion 312 for end milling. The second end milling blade portion 312 also includes a chisel blade portion 3121. Figure 3 、 Figure 4 、 Figure 7 and Figure 8 As shown, the effective cutting length of the first side milling edge 211 is greater than the effective cutting length of the second side milling edge 311, and the effective cutting length of the first end milling edge 212 is less than the effective cutting length of the second end milling edge 312. The first spiral cutting edge 21 is primarily responsible for side milling a large area of the workpiece periphery and partial end milling. The second spiral cutting edge 31, because it passes the center of rotation, focuses on large-area cutting in the center of the workpiece and partial outer diameter side milling.
[0031] like Figure 1 and Figure 2 As shown, after the second PCD cutter head 3 is installed, the cutting surface corresponding to the spiral chip groove 11 and the carbide cutter body 1 form a second chip guide groove 14 that communicates with the spiral chip groove 11. Figure 6 As shown, the front end of the cemented carbide cutter body 1 is also provided with a first chip guide groove 15 in communication with the corresponding spiral chip groove 11 at the position corresponding to the first PCD cutter head 2. The second chip guide groove 14 and the first chip guide groove 15 can guide chips into the corresponding spiral chip groove 11 for discharge during machining, thereby reducing chip accumulation on the corresponding cutting edge.
[0032] like Figure 3 As shown, the rotation diameter D1 of the side milling edge portion of the first spiral cutting edge 21 and the second spiral cutting edge 31 is larger than the diameter D2 of the carbide cutter body 1. In this way, during the cutting process, the first spiral cutting edge 21 and the second spiral cutting edge 31 are guaranteed to cut the workpiece, avoiding the carbide cutter body 1 from participating in the cutting, scratching the workpiece surface and damaging the carbide cutter body 1. Figure 4 As shown, in the axial direction of the carbide cutter body 1, the length of the entire spiral blade milling cutter is L, the outer diameter length of the first spiral cutting edge 21 is L2, and the outer diameter length of the second spiral cutting edge 31 is L1. In actual manufacturing, L2 is 2 to 5 times of L1, and this multiple is a positive number in the range of 2 to 5. Reasonable parameter design can be performed according to actual needs. The outer diameter length of the second spiral cutting edge 31 is shorter, which is more suitable for precise and large-scale cutting of the central area, avoiding machining vibration or precision error in the central area caused by excessive blade length. Although the first spiral cutting edge 21 is mainly responsible for cutting the peripheral area of the workpiece, the first spiral cutting edge 21 and the second spiral cutting edge 31 can cooperate with each other to achieve precise machining of the workpiece.
[0033] The present invention uses high-impact carbide as the main body of the spiral-edge milling cutter. The spiral groove is pre-ground on the carbide cutter body 1, and then the PCD cutter head material is welded as the raw material for the cutting edge. The spiral cutting edge is then machined using an advanced CNC EDM grinder. The desired spiral edge can be produced based on the workpiece being machined.
[0034] Figure 9 This is a schematic diagram of the cutting thermal analysis process using finite element analysis software, which selects the overall PCD cutting material and then adjusts the different parameters of the cutting edge. Figure 9 The spiral cutting edge of the left tool has a small helix angle, while the spiral cutting edge of the right tool has a large helix angle. The other parameters of the two sets of tools are the same. From the experimental results, the red part of the blade is the focus of cutting heat. Under the same cutting conditions, Figure 9 The spiral cutting edge of the tool on the left generates greater cutting heat, and the area of the cutting edge where this heat is concentrated is larger. The spiral cutting edge of the tool on the right, on the other hand, generates less cutting heat, and the area of the cutting edge where this heat is concentrated is smaller, effectively reducing the rate of cutting edge wear. In other words, as the helix angle increases, less cutting heat is generated, and the heat dissipation capacity is enhanced. However, given the properties of PCD material, the helix angle cannot be excessively increased during machining. Therefore, an appropriate helix angle, while maintaining the inherent strength of the PCD, ensures rapid heat dissipation, reduces cutting heat generation at the cutting edge, protects the cutting edge, and extends the tool's life.
[0035] The welded integral PCD spiral blade milling cutter of the present invention uses PCD material as the cutting edge, and takes advantage of the high hardness, strong wear resistance and excellent thermal conductivity of PCD to significantly reduce the wear rate of the blade. At the same time, during the cutting process, it can ensure that only the PCD blade contacts the workpiece, preventing the carbide cutter body 1 from participating in the cutting or scratching the workpiece, further reducing ineffective wear, and ultimately extending the tool life, reducing the number of replacements, reducing the operator's workload, and improving production continuity. In addition, the welded integral PCD spiral blade milling cutter of the present invention can simultaneously achieve side milling and end milling, and can complete all-round processing with one clamping. The differentiated design of the effective cutting length of the first spiral cutting edge 21 and the second spiral cutting edge 31 forms layered cutting processing of the periphery and the center, reasonably distributes the cutting load, avoids overloading of a single blade, and further improves processing efficiency. Since the two first spiral cutting edges 21 and the two second spiral cutting edges 31 are symmetrically distributed about the center of rotation, the cutting force is evenly distributed in the circumferential direction, greatly reducing vibration, and can meet the high-speed cutting machine processing of machine tools within 40,000 r / min.
[0036] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.
[0037] The welded integral PCD spiral blade milling cutter provided by the present invention is introduced in detail above. Specific embodiments are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified in a number of ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention. The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.
Claims
1. A welded integral PCD spiral edge milling cutter, comprising a carbide cutter body, characterized in that: It also includes a first PCD cutter head and a second PCD cutter head welded to the carbide cutter body; two first PCD cutter heads are provided, each having a first spiral cutting edge, and the two first PCD cutter heads are centrally symmetrically distributed about the rotation center of the carbide cutter body; the second PCD cutter head penetrates the carbide cutter body, and the second PCD cutter head has two second spiral cutting edges that pass through the rotation center and are centrally symmetrically distributed about the rotation center; the first spiral cutting edge and the second spiral cutting edge both include a side milling edge portion for side milling and an end milling edge portion for end milling; a spiral chip groove is provided on the side of each PCD cutter head on the carbide cutter body.
2. A welded integral PCD spiral edge milling cutter according to claim 1, characterized in that: The effective length of the side milling edge of the first spiral cutting edge involved in cutting is greater than the effective length of the side milling edge of the second spiral cutting edge involved in cutting, and the effective length of the end milling edge of the first spiral cutting edge involved in cutting is less than the effective length of the end milling edge of the second spiral cutting edge involved in cutting.
3. The welded integral PCD spiral edge milling cutter according to claim 1, characterized in that: The helix angle of the first helical cutting edge is within a range of 10° to 20°.
4. A welded integral PCD spiral edge milling cutter according to claim 3, characterized in that: The helix angle of the second helical cutting edge is within a range of 10° to 20°.
5. The welded integral PCD spiral edge milling cutter according to claim 1, characterized in that: The rotation diameters of the side milling edge portions of the first spiral cutting edge and the second spiral cutting edge are both larger than the diameter of the cemented carbide cutter body.
6. A welded integral PCD spiral edge milling cutter according to any one of claims 1 to 5, characterized in that: Two of the relatively arranged chip grooves have first cutter head positioning and mounting grooves on their walls, and the two first PCD cutter heads are respectively welded to the corresponding first cutter head positioning and mounting grooves; a second cutter head positioning groove is provided on the carbide cutter body, passing through the other two relatively arranged chip grooves, and the second cutter head positioning groove extends radially along the carbide cutter body and passes through the rotation center, and the second PCD cutter head is welded in the second cutter head positioning groove.
7. A welded integral PCD spiral edge milling cutter according to any one of claims 1 to 5, characterized in that: The first PCD cutter head has a first rake face and a first flank face, and the connecting position of the first rake face and the first flank face forms the first spiral cutting edge, and the first rake face is a spiral surface processed by an electric spark CNC grinder and matched with the spiral chip groove, so that after the first PCD cutter head is installed, the first rake face and the groove wall of the spiral chip groove extend spirally along the same angle; the second PCD cutter head has two second rake faces and two second flank faces, and the connecting position of the second rake face and the corresponding second flank face forms the second spiral cutting edge, and the second rake face is a spiral surface processed by an electric spark CNC grinder and matched with the spiral chip groove, so that after the second PCD cutter head is installed, the second rake face and the groove wall of the spiral chip groove extend spirally along the same angle.
8. The welded integral PCD spiral edge milling cutter according to claim 1, characterized in that: Two second chip guide grooves respectively connected to the corresponding chip grooves are formed between the second PCD cutter head and the cemented carbide cutter body.
9. The welded integral PCD spiral edge milling cutter according to claim 7, characterized in that: The end of the cemented carbide tool body is provided with a first chip guide groove in communication with the corresponding chip groove at a position corresponding to the first PCD tool head.
10. The welded integral PCD spiral edge milling cutter according to claim 1, characterized in that: In the axial direction of the cemented carbide cutter body, the outer diameter length of the first spiral cutting edge is 2 to 5 times the outer diameter length of the second spiral cutting edge.