A PCD spiral cutting tool and its machining process

Abstract

This application relates to a PCD helical cutting edge milling tool and its machining process, specifically within the technical field of PCD cutting tools. The tool includes a carbide tool holder and insert slots. Each insert slot is fixedly fitted with a PCD insert. Before installation, the PCD insert has a pre-machined helical upper surface. After installation, the cutting edge is formed by laser machining. This application provides a low-cost, high-quality cutting tool by separately machining the carbide tool holder and PCD inserts, then fixing the PCD inserts and carbide tool holder together, and finally using a laser to sequentially machine multiple PCD inserts to obtain the cutting edge.

Description

Technical Field

[0001] This application relates to the technical field of PCD cutting tools, and in particular to a PCD helical cutting milling tool and its machining process. Background Technology

[0002] Milling is a machining operation that uses a milling cutter to remove material from the sidewalls and inner walls of a workpiece. Based on the material of the cutter, milling cutters are mainly rotating tools used for milling, with one or more cutting teeth that intermittently cut away material from the workpiece during operation. Milling cutters are primarily used for machining planes, steps, shaped surfaces, and other workpieces.

[0003] When machining large-margin or thin-walled parts, the large cutting margin or low support strength of thin walls often causes the milling cutter to vibrate during machining. Vibration reduces tool life and also reduces the surface quality of the workpiece.

[0004] To address the aforementioned technical issues, PCD spiral end mills have been widely adopted. PCD spiral end mills, compared to ordinary end mills, can significantly disperse cutting forces, thereby reducing the risk of vibration. Existing spiral end mills are either made entirely of PCD material or constructed by fixing PCD inserts to an alloy tool holder. For the first type, PCD material is relatively expensive and has high hardness, making the manufacturing process for chip flutes and cutting edges more complex. For the second type, manufacturing typically involves welding followed by electrical discharge grinding (EDG) on a copper wheel to machine chip flutes and cutting edges, resulting in a larger machining allowance and increasing the difficulty of tool machining. Furthermore, EDM can easily cause PCD material particles to detach. All these factors increase the production cost of the tool and reduce its quality. Therefore, providing a low-cost, high-quality tool is an urgent problem to be solved. Summary of the Invention

[0005] In order to provide a low-cost and high-quality cutting tool, this application provides a PCD spiral cutting tool and its machining process.

[0006] Firstly, this application provides a PCD helical cutting edge milling tool, which adopts the following technical solution: A PCD helical cutting milling tool includes an alloy tool holder and multiple insert slots circumferentially formed around the axis of the alloy tool holder. Each insert slot is fixedly mounted with a PCD insert. The PCD insert has a helical upper surface pre-machined before installation and a cutting edge is formed by laser processing after installation.

[0007] By adopting the above technical solution, the alloy bar is first processed to obtain an alloy tool holder, and the alloy tool holder has been processed to obtain multiple insert grooves. At the same time, the PCD insert is processed to obtain a spiral upper surface. Then, the PCD insert is fixedly installed on the insert groove. Next, the multiple PCD inserts are processed to obtain a cutting edge using a laser.

[0008] The alloy tool holder and PCD insert are machined separately using specialized equipment to obtain a helical cutting edge, which reduces the machining cost and maximizes the benefits. This reduces the production cost of the tool, and the helical cutting edge can improve the cutting sharpness, service life and surface finish of the workpiece, and reduce the axial shear stress of the tool during the machining process, thereby providing a low-cost and high-quality tool.

[0009] Meanwhile, the PCD inserts are manufactured with the entire contour and helical upper surface already machined, which also results in less material allowance at the cutting edge. Then, multiple PCD inserts are machined simultaneously using a laser to obtain the cutting edge, thereby improving tool quality and reducing the probability of PCD material detachment during cutting edge machining. This leads to higher tool quality and extended tool life, thus providing a low-cost and high-quality tool.

[0010] Optionally, the alloy tool holder is provided with multiple alloy chip removal grooves, the insert groove is provided on the alloy chip removal grooves, and the upper surface of the spiral is provided with PCD chip removal grooves. Both the alloy chip removal grooves and the PCD chip removal grooves are spiral in shape and have the same spiral angle.

[0011] By adopting the above technical solution, the alloy chip removal groove and the PCD chip removal groove work together to remove chips. At the same time, the PCD chip removal groove is opened on the upper surface of the spiral, so that the PCD chip removal groove and the alloy chip removal groove form a step due to the height difference. Therefore, when the chips move to this step, the chips are divided into two parts under the guidance of the step, so that the chips form two channels for discharge. This reduces the probability of chips concentrating in one place and getting tangled or even tangled on the tool, thereby improving the chip removal effect of the tool and improving the quality of the tool.

[0012] Optionally, the helix angle of the upper surface of the helix is ​​β, where 0° < β ≤ 30°.

[0013] By adopting the above technical solution, the helical PCD insert can improve the cutting ability of the tool. However, as the helix angle increases, the difficulty of PCD insert production and welding will also increase the resistance of the tool during milling, increasing the risk of vibration during milling. In particular, when machining thin-walled workpieces as described in this application, the vibration phenomenon is more serious, reducing the stability of the chips. Therefore, limiting the helix angle to 30° or below makes it possible to achieve low production difficulty, strong and stable chip cutting ability of PCD inserts. This allows the tool to achieve low cost, strong and stable chip cutting ability, and extended tool life, thereby providing a low-cost tool with strong and stable chip cutting ability for machining thin-walled workpieces.

[0014] Optionally, the PCD insert is divided into an end face tooth section, a long tooth section, a chamfering cutting edge section, and a short tooth section in sequence. The end face tooth section is used for milling the end face, and the long tooth section is used for milling the sidewall. The chamfering cutting edge section and the short tooth section both protrude outside the long tooth section and are used for chamfering and milling the sidewall, respectively.

[0015] By adopting the above technical solution, the end face tooth section can mill the end face or the bottom wall of the slot, while the long tooth section can mill the side wall with a longer dimension. The chamfering edge section can chamfer the machined surface, while the short tooth section is used to mill the side wall with a smaller dimension, or to mill the stepped surface. Therefore, the PCD insert can realize the three functions of end face and side wall milling and chamfering in one piece. At the same time, the long tooth section and the short tooth section can meet the machining requirements of various sizes, thereby improving the cutting function of the PCD insert. In addition, the integration of multiple functions also increases the area of ​​the PCD insert, improves the stability of the PCD insert itself and its fixed installation on the insert slot, extends the tool life, and improves the quality of the tool.

[0016] Optionally, the number of PCD blades is even, and two PCD blades arranged opposite each other are grouped together, such that the PCD blades are divided into tooth group A and tooth group B. The chamfered cutting edge is in an inclined state. The included angle between the chamfered cutting edge and the short tooth in tooth group A is γ1, and the included angle between the chamfered cutting edge and the short tooth in tooth group B is γ2, and 0° < γ2 - γ1 < 30°.

[0017] By adopting the above technical solution, multiple sets of PCD inserts work together to distribute the force during milling, thereby reducing the reaction force on a single PCD insert, improving the stability of the PCD insert, and improving the quality of the tool. The chamfering edge is located between the long tooth section and the short tooth section, resulting in a small size of the chamfering edge, which leads to lower strength and easy damage. Therefore, the machining surface is milled by the cooperation of tooth group A and tooth group B. Tooth group B first mills the machining surface, leaving a material allowance after milling, and then tooth group A continues to mill the machining surface, so as to evenly distribute the cutting amount of each tooth, improve the quality of the tool, and extend the tool life.

[0018] Optionally, a tooth angle is formed at the connection between the end face tooth portion and the long tooth portion, and the tooth angle is any one of a right angle, a circular arc, and a straight chamfer; γ2 is 50°, and γ1 is 30°.

[0019] By adopting the above technical solution, the tooth angle can be designed as needed. The tooth angle is used for avoidance, while γ2 is 50° and γ1 is 30°, which further makes the cutting amount of each tooth more uniform, improves the quality of the tool, and extends the tool life.

[0020] Optionally, a step for guiding chips is formed between the upper surface of the spiral and the alloy chip removal groove, and the height of the step gradually increases from zero along the direction from the end face tooth to the short tooth.

[0021] By adopting the above technical solution, one end of the upper surface of the helix located at the end face tooth is flush with the alloy chip removal groove, which allows the chips generated after cutting by the PCD insert to enter the alloy chip removal groove. At the same time, it also ensures that the PCD insert has sufficient thickness to meet the cutting strength requirements. Meanwhile, from the end face tooth to the short tooth, the height of the step gradually increases, causing the chips after cutting to move along the upper surface of the helix towards the step. Then, some chips pass through the step and enter the alloy chip removal groove for discharge, while other chips are discharged from the upper surface of the helix due to the obstruction of the step. This reduces the probability of chips being concentrated and discharged from one place, greatly reducing the situation where chips are entangled together or even wrapped around the tool when they are discharged in a concentrated manner. This improves the chip removal effect of the tool and extends the tool life.

[0022] Optionally, the alloy tool holder has multiple end-cutting relief angles at one end near the end face teeth. These multiple end-cutting relief angles are used to avoid the end face teeth during milling and to allow the end face teeth to contact the end face first, guiding the chips into the alloy chip removal groove.

[0023] By adopting the above technical solution, the end face toothed part contacts the machining surface first during milling when the tool moves, which improves the stability of the tool during machining and extends the tool life. At the same time, the end face toothed part creates a chip removal space between the end face toothed part and the machining surface, allowing the chips generated during milling to enter the alloy chip removal groove for discharge, thus further improving the chip removal effect of the tool and extending the tool life.

[0024] Optionally, the PCD blade is welded and fixedly mounted on the insert groove. The PCD blade includes a base layer and a PCD layer that are integrally connected during processing. The base layer is made of a material that is easy to weld and fix to the insert groove and is fixedly connected to the insert groove.

[0025] By adopting the above technical solution, the requirements for welding PCD material and alloy are relatively high, which also makes it more difficult to weld PCD inserts into the insert groove, thus increasing the processing cost of PCD inserts. In the production of PCD inserts, the PCD layer and the base layer are sintered into one piece in a high temperature and high pressure sintering furnace, and then the PCD layer is welded and fixedly connected to the insert groove, thereby reducing the production cost of the tool.

[0026] Secondly, the PCD spiral cutting milling tool machining process provided in this application adopts the following technical solution: A PCD spiral cutting tool machining process includes the following steps: Production of alloy tool holders: Helical alloy chip removal grooves and insert grooves are cut or ground on alloy bars, and multiple end-edge clearance angles are obtained at the same time. PCD insert semi-finished product processing: PCD inserts are first shaped to obtain semi-finished products, and then the semi-finished products are processed by special electrical discharge machining or laser processing to obtain the spiral upper surface; PCD insert fixing: Multiple PCD inserts are welded and fixed to multiple insert slots using vacuum welding or high-frequency welding; PCD insert machining: Laser processing is used to process multiple PCD inserts to obtain cutting edges, thereby completing the tool machining.

[0027] By adopting the above technical solution, alloy chip removal grooves, insert grooves, and end-edge clearance angles are first formed by cutting or grinding alloy bars. At the same time, the upper surface of the helical PCD insert is processed. Then, the PCD insert is welded and fixedly installed on the insert groove. Next, multiple PCD inserts are processed by laser to obtain the cutting edge, thereby completing the tool processing. This improves the convenience and quality of tool production and achieves low cost and high quality of tools.

[0028] In summary, this application includes at least one of the following beneficial technical effects: By separately machining the alloy tool holder and PCD insert to obtain a pure helical cutting edge, the machining process becomes more cost-effective and efficient. Moreover, the helical cutting edge can improve the cutting sharpness, service life, and surface finish of the workpiece, and reduce the axial shear stress of the tool during machining, thereby resulting in higher tool quality and extended tool life, thus providing a low-cost and high-quality tool. Attached Figure Description

[0029] Figure 1 This is a three-dimensional structural diagram of the cutting tool in this application; Figure 2 yes Figure 1 Enlarged diagram of section A in the middle; Figure 3 This is a schematic diagram of the structure of tooth groups A and B in this application.

[0030] Reference numerals: 11, insert groove; 12, alloy chip removal groove; 13, insert body; 14, end face clearance angle; 2, alloy tool holder; 21, clamping part; 22, connecting part; 23, mounting part; 3, PCD insert; 31, base layer; 32, PCD layer; 33, end face tooth; 34, long tooth; 35, chamfered edge; 36, short tooth; 37, tooth angle; 41, A tooth group; 42, B tooth group; 5, helix clearance angle; 6, upper surface of helix; 7, PCD chip removal groove; 8, step. Detailed Implementation

[0031] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0032] This application discloses a PCD spiral cutting milling tool.

[0033] Reference Figure 1 and Figure 2 The PCD spiral milling cutter includes an alloy tool holder 2 and multiple insert slots 11 circumferentially opened around the axis of the alloy tool holder 2. Each insert slot 11 is fixedly installed with a PCD insert 3. Before installation, the PCD insert 3 has been machined to form a spiral upper surface 6. After installation, the PCD insert 3 is laser-processed to form a cutting edge.

[0034] The alloy tool holder 2 includes a clamping part 21, a connecting part 22, and a mounting part 23 that are coaxially connected and gradually decrease in diameter. The clamping part 21 has the largest diameter to facilitate clamping with a tool shank during use. Multiple alloy chip removal grooves 12 are formed around the axis of the alloy tool holder 2. The alloy chip removal grooves 12 are formed on the side wall of the mounting part 23 and penetrate the mounting part 23 at the end opposite to the connecting part 22 and extend along the axis of the mounting part 23 to the connecting part 22. The alloy chip removal grooves 12 are spiral-shaped and used for chip removal.

[0035] The number of alloy chip removal grooves 12 is even and not less than four. The following description assumes four alloy chip removal grooves 12. The number of insert grooves 11 is the same as the number of alloy chip removal grooves 12 and they are arranged in a one-to-one correspondence. The insert grooves 11 are formed on the side wall of the alloy chip removal grooves 12 and also extend to the connecting part 22. The alloy tool holder 2, alloy chip removal grooves 12, and insert grooves 11 are all produced using specialized equipment. The production of the tool is existing technology and will not be described further here.

[0036] The number of PCD inserts 3 is the same as the number of insert slots 11 and they are set one-to-one. The PCD inserts 3 are fixedly installed on the insert slots 11 by welding. The PCD inserts 3 include a base layer 31 and a PCD layer 32 that are connected as a whole during processing. The base layer 31 is made of a material that is easy to fix to the insert slot 11, and the base layer 31 is fixedly connected to the insert slot 11. The PCD layer 32 is located above the base layer 31 and is made of PCD material. The base layer 31 can be made of metal or alloy, etc.

[0037] Reference Figure 1 and Figure 2 The PCD layer 32 has a spiral upper surface 6 on the side wall near the alloy chip removal groove 12, and the PCD blade 3 has a chip cutting edge for chip removal. The PCD blade 3 has a PCD chip removal groove 7 on the side wall near the alloy chip removal groove 12. The PCD chip removal groove 7 passes through the PCD blade 3 along the axis of the alloy tool holder 2. The spiral upper surface 6, the alloy chip removal groove 12 and the PCD chip removal groove 7 are all spiral and the spiral angle of all three is β, where 0°<β≤30°. β is designed as needed, and β is preferably 10°, 20°, 25° and 30°.

[0038] The spiral upper surface 6 and the PCD chip removal groove 7 are machined before the PCD blade 3 is installed into the insert groove 11. That is, they are machined together during the machining of the PCD blade 3. However, there is still a machining allowance at the chip cutting edge of the PCD blade 3, so that the chip cutting edge is formed by laser cutting after the PCD blade 3 is welded and fixedly installed into the insert groove 11.

[0039] Reference Figure 1 and Figure 3 The PCD insert 3 is divided into an end face tooth section 33, a long tooth section 34, a chamfering cutting edge section 35, and a short tooth section 36. The end of the PCD insert 3 near the mounting part 23 extends outside the insert groove 11, and the end face tooth section 33 is located at the end of the PCD insert 3 outside the insert groove 11. The end face tooth section 33 is perpendicular to the axis of the alloy tool holder 2 and is used for milling the end face or the bottom of the groove. The long tooth section 34 is used for milling the side wall with a longer dimension. The chamfering cutting edge section 35 and the short tooth section 36 both protrude outside the long tooth section 34, and the chamfering cutting edge section 35 is used for chamfering the machined surface.

[0040] The short tooth 36 is shorter than the long tooth 34 and is used for milling smaller sidewalls. The short tooth 36 protrudes beyond the long tooth 34, allowing it to mill stepped sidewalls as well. The machining areas of the long tooth 34, the chamfered cutting edge 35, and the short tooth 36 are all located outside the insert groove 11 to facilitate cutting. The end face tooth 33, the long tooth 34, the chamfered cutting edge 35, and the short tooth 36 are all provided with chamfered helical back angles 5, which are used to avoid obstruction during machining. A tooth angle 37 is formed at the connection between the end face tooth 33 and the long tooth 34, and the tooth angle 37 can be any one of a right angle, a circular arc, or a straight chamfer.

[0041] Two PCD inserts 3 are arranged opposite each other, forming a group, thus dividing the multiple PCD inserts 3 into tooth group A 41 and tooth group B 42. Therefore, the two PCD inserts 3 in tooth group A 41 and the two PCD inserts 3 in tooth group B 42 are spaced apart. The included angle between the chamfered cutting edge 35 and the two short teeth 36 of the two PCD inserts 3 in tooth group A 41 is γ1, while the included angle between the chamfered cutting edge 35 and the short teeth 36 of the two PCD inserts 3 in tooth group B 42 is γ2, where 0° < γ2 - γ1 < 30°, preferably γ2 is 50° and γ1 is 30°. Therefore, tooth group B 42 mills the machined surface first, leaving a machining allowance after milling, and then tooth group A 41 continues milling the machined surface. This evenly distributes the cutting amount per tooth, improving tool quality and extending tool life.

[0042] Reference Figure 1 and Figure 3 After the alloy chip removal groove 12 is opened, the alloy tool holder 2 forms four insert bodies 13, and the four insert bodies 13 are arranged in a circumferential array around the alloy tool holder 2. The end of the four insert bodies 13 opposite to the connecting part 22 is provided with an end cutting clearance angle 14. The end cutting clearance angle 14 connects the two alloy chip removal grooves 12, and the end cutting clearance angle 14 is in an inclined state and is used to guide the chips generated by cutting into the alloy chip removal groove 7 for discharge. At the same time, the end cutting clearance angle 14 also causes the end of the PCD insert 3 near the end cutting clearance angle 14 to extend outside the insert groove 11, so that when milling the end face, the end face tooth 33 first contacts the surface to be machined for milling. The end cutting clearance angle 14 is machined at the same time when the alloy tool holder 2 is produced.

[0043] Reference Figure 1 , Figure 2 and Figure 3A step 8 is formed between the upper surface 6 of the spiral and the bottom of the alloy chip removal groove 12 to guide the chips. The height of the step 8 gradually increases from zero along the direction from the end face tooth 33 to the short tooth 36. The step 8 has a vertical planar structure, and the step 8 can also be an arc-shaped structure. This reduces the accumulation of chips at the step 8, so that the end of the upper surface 6 of the spiral near the end face tooth 33 is flush with the alloy chip removal groove 7. This ensures that the PCD insert 3 has sufficient thickness to guarantee the strength of the PCD insert 3.

[0044] The height between the upper surface 6 of the spiral near the short tooth 36 and the alloy chip removal groove 12 is the greatest, and the upper surface 6 of the spiral is located on the side of the alloy chip removal groove 12 near the axis of the alloy tool holder 2. This allows the step 8 to allow the chips to be discharged in two directions. One direction is to continue moving along the upper surface 6 for discharge, and the other direction is to enter the alloy chip removal groove 7 for discharge. This greatly reduces the probability that the chips will entangle together or even get tangled on the tool when discharged in one place, thus improving the chip removal effect and extending the tool life.

[0045] The working principle of this application embodiment is as follows: Specialized equipment is used to separately process alloy tool holders and PCD inserts. The alloy tool holders are already machined and have alloy chip removal grooves, insert grooves, and end-edge clearance angles. The PCD inserts have remaining allowance at the cutting edge. Then, multiple PCD inserts are welded and fixedly installed onto multiple insert grooves. Finally, laser processing is used to form the cutting edge of the multiple PCD inserts, thus completing the tool production. This improves the convenience and quality of tool production, extends tool life, and provides a low-cost and high-quality tool.

[0046] This application discloses a PCD spiral cutting tool machining process.

[0047] Reference Figure 1 and Figure 2 The machining process for PCD spiral cutting milling tools includes the following steps: Production of alloy tool holder 2: Helical alloy chip removal grooves 12 and insert grooves 11 are cut or ground on the alloy bar stock, and multiple end cutting clearance angles 14 are processed at the same time. PCD blade 3 semi-finished product processing: PCD blade 3 is first shaped to obtain a semi-finished product, and then the semi-finished product is processed by laser processing or electrical discharge machining to obtain the spiral upper surface 6; PCD blade 3 fixing: Multiple PCD blades 3 are welded and fixed to multiple insert slots 11 by vacuum welding or high frequency welding; PCD insert 3 finished product processing: Laser processing is used to process multiple PCD inserts 3 to obtain cutting edges, thereby completing the tool processing.

[0048] The working principle of this application embodiment is as follows: First, the alloy chip removal groove 12, insert groove 11 and end-edge clearance angle 14 are formed by cutting or grinding the alloy bar. At the same time, the helical upper surface 6 is machined by the PCD insert 3. Then, the PCD insert 3 is welded and fixedly installed on the insert groove 11. Next, multiple PCD inserts 3 are machined by laser to obtain the cutting edge, thereby completing the tool processing. This improves the convenience and quality of tool production and achieves low cost and high quality of tools.

[0049] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A PCD helical cutting milling tool, characterized in that: It includes an alloy tool holder (2) and multiple insert slots (11) circumferentially opened around the axis of the alloy tool holder (2). Each insert slot (11) is fixedly installed with a PCD insert (3). The PCD insert (3) has a spiral upper surface (6) before installation and a cutting edge is formed by laser processing after installation. The alloy tool holder (2) is provided with multiple alloy chip removal grooves (12), the insert groove (11) is provided on the alloy chip removal grooves (12), and the upper surface (6) of the spiral is provided with PCD chip removal grooves (7). The alloy chip removal grooves (12) and PCD chip removal grooves (7) are both spiral and have the same spiral angle. The PCD insert (3) is divided into an end face tooth section (33), a long tooth section (34), a chamfering cutting edge section (35), and a short tooth section (36) in sequence. The end face tooth section (33) is used for milling the end face, and the long tooth section (34) is used for milling the side wall. The chamfering cutting edge section (35) and the short tooth section (36) both protrude from the long tooth section (34) and are used for chamfering and milling the side wall, respectively. The number of PCD blades (3) is even and two PCD blades (3) are arranged opposite each other to form a group, so that the PCD blades (3) are divided into group A (41) and group B (42). The chamfered cutting edge (35) is in an inclined state. The angle between the chamfered cutting edge (35) and the short tooth (36) in group A (41) is γ1, and the angle between the chamfered cutting edge (35) and the short tooth (36) in group B (42) is γ2, and 0° < γ2 - γ1 < 30°.

2. The PCD helical cutting milling tool according to claim 1, characterized in that: The spiral angle of the upper surface (6) of the spiral is β, where 0° < β ≤ 30°.

3. A PCD spiral cutting milling tool according to claim 1, characterized in that: A tooth angle (37) is formed at the connection between the end face tooth portion (33) and the long tooth portion (34), and the tooth angle (37) is any one of a right angle, a circular arc and a straight chamfer; γ2 is 50° and γ1 is 30°.

4. A PCD spiral cutting milling tool according to claim 1, characterized in that: A step (8) for guiding the chips is formed between the upper surface (6) of the spiral and the alloy chip removal groove (12). The height of the step (8) gradually increases from zero along the direction from the end face tooth (33) to the short tooth (36).

5. A PCD spiral cutting milling tool according to claim 1, characterized in that: The alloy tool holder (2) has multiple end-edge relief angles (14) at one end near the end face tooth (33). The multiple end-edge relief angles (14) are used to avoid the end face tooth (33) milling the end face and to make the end face tooth (33) contact the end face first and guide the chips into the alloy chip removal groove (12).

6. A PCD spiral cutting milling tool according to claim 1, characterized in that: The PCD blade (3) is welded and fixedly installed on the insert groove (11). The PCD blade (3) includes a base layer (31) and a PCD layer (32) that are integrated during processing. The base layer (31) is made of a material that is easy to weld and fix to the insert groove (11) and is fixedly connected to the insert groove (11).

7. A machining process applied to the PCD helical cutting milling tool described in claim 5, characterized in that: The process includes the following steps: Production of alloy tool holder (2): Helical alloy chip removal groove (12) and insert groove (11) are cut or ground on alloy bar stock, and multiple end cutting clearance angles (14) are obtained at the same time. PCD blade (3) Semi-finished product processing: PCD blade (3) is first formed to obtain a semi-finished product, and then the semi-finished product is processed by laser processing or electrical processing to obtain the spiral upper surface (6). Fixing of PCD blades (3): Multiple PCD blades (3) are welded and fixed to multiple insert slots (11) by vacuum welding or high frequency welding; PCD insert (3) finished product processing: Laser processing is used to process multiple PCD inserts (3) to obtain cutting edges, thereby completing the tool processing.

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