Multi-edge milling cutter and manufacturing method thereof

Abstract

The invention discloses a multi-edge milling cutter. The multi-edge milling cutter comprises a cutter handle and a cutter head, a plurality of spiral blades which are spirally arranged are arranged on the outer side surface of the tool bit; the end of each tool bit is provided with a chip removal opening and a chip removal assisting lubricating structure. The auxiliary chip removal lubricating structure comprises a plurality of chip removal grooves and an auxiliary pipeline structure; the plurality of chip removal grooves are respectively arranged between the two spiral blades in a spiral manner; the assisting pipeline structure comprises a collecting pipe and a plurality of first pipeline sets. The first pipeline set is provided with a compression spraying structure. The invention further discloses a manufacturing method. The auxiliary pipeline structure is arranged for chip removal, residual of chips in the chip removal groove is prevented, and therefore cleanliness of the tool bit is guaranteed; therefore, cutting performance and efficiency are guaranteed, and service life is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of metal cutting tools, and in particular to a multi-edge milling cutter and a manufacturing method thereof. Background Art

[0002] A milling cutter is a rotary tool with one or more teeth used for milling. When working, each tooth rotates and cuts off the excess of the workpiece intermittently. Milling cutters are mainly used for processing planes, steps, grooves, forming surfaces and cutting off workpieces on milling machines.

[0003] For example, the utility model patent application CN201320359393.3 provides a six-blade milling cutter, including a tool bar and a tool head. The tool head is provided with six spiral side cutting edges and corresponding six end cutting edges. The helix angle α of the side cutting edges is between 45° and 50°. A spiral chip removal groove is provided between the side cutting edges. The first clearance angle of the end cutting edges is 7°, the second clearance angle of the end cutting edges is 16°, and the front angle of the end cutting edges is 8°. A titanium aluminum nitride coating is provided on the surface of the tool head. After adopting the above structure, when the utility model processes the machined surface of the workpiece, the end cutting edges and the side cutting edges process the workpiece, and the processed metal chips are smoothly discharged from the chip removal groove with a helix angle of 45° to 50°, and metal chips will not be blocked between the machined surface and the tool, thereby ensuring the processing accuracy and quality of the machined workpiece and extending the service life of the tool.

[0004] The above-mentioned six-blade milling cutter increases the quality of tool use by setting the first back angle of the end blade to 7°, the second back angle of the end blade to 16°, and the front angle of the end blade to 8°. However, because the six-blade milling cutter has a faster cutting speed and higher efficiency when working, the chip groove needs to accommodate more and is prone to clogging. At the same time, the faster the cutting speed, the more likely it is to generate heat, and overheating will affect the life and working efficiency of the milling cutter.

[0005] In response to the above problems, the publication number: CN202223205022.0 discloses a high-efficiency six-blade milling cutter, which includes a shank portion and a blade portion extending from one end of the shank portion in the axial direction; the blade portion is spirally arranged with multiple blades on the side, and a chip groove is formed between adjacent blades, and the width of the chip groove increases from the middle to both ends; a first cooling channel is provided in the middle of the shank portion, one end of the first cooling channel is closed, and the other end of the first cooling channel passes through an end face of the shank portion away from the blade portion; a plurality of second cooling channels are also provided inside the blade portion, and one end of each of the second cooling channels is connected to the first cooling channel, and the other end extends to the chip groove. The first cooling channel and the second cooling channel are provided, and when the six-blade milling cutter is working, coolant is introduced into the first cooling channel and the second cooling channel, so that the six-blade milling cutter can be cooled quickly and work continuously during operation, thereby increasing the life and working efficiency of the milling cutter. However, the milling cutter still has the following problems: the existing milling cutter has a slow chip removal efficiency, and a cooling channel is used for the outflow of coolant. Due to the lack of a pressurized structure, the discharge impact force of the coolant is relatively low. When the chip groove of the milling cutter is blocked due to the chips being welded together and sticking or getting stuck during processing, the chip removal efficiency and the cutting efficiency of the blade are affected, the processing of the workpiece is affected, the production efficiency is affected, and the service life of the milling cutter is reduced. Summary of the invention

[0006] The present invention aims at the current technical deficiencies and provides a multi-edge milling cutter and a manufacturing method thereof, aiming to solve the technical problems of poor chip removal efficiency, low stubborn chip removal efficiency and low cutting efficiency of the multi-edge milling cutter in the prior art.

[0007] The technical solution adopted by the present invention to achieve the above-mentioned purpose is:

[0008] A multi-blade milling cutter comprises a milling cutter body, wherein the milling cutter body comprises a shank and a cutter head, and is characterized in that: the cutter head is fixedly connected to one end of the shank; the outer side surface of the cutter head is provided with a plurality of spirally arranged spiral blades; the ends of the cutter head are provided with chip removal openings; the cutter head is also provided with a lubrication structure to assist chip removal; and the surface of the cutter head is provided with a hardened coating.

[0009] As a further improvement, the auxiliary chip removal lubrication structure includes a plurality of chip removal grooves and an auxiliary pipeline structure, wherein the plurality of chip removal grooves are respectively arranged in a spiral manner between the two spiral blades, and the chip removal grooves are respectively connected to the chip removal ports; the auxiliary pipeline structure is arranged in the cutter head.

[0010] As a further improvement, the auxiliary pipeline structure includes a collecting pipe, which is provided with a plurality of connecting pipes, and the connecting pipes are respectively arranged below the chip discharge groove; the connecting pipes are provided with a plurality of pipe groups, and the pipe groups are provided with a compression ejection structure.

[0011] As a further improvement, multiple pipe groups 1 are arranged on the connecting pipe in an array manner; multiple pipe groups 1 each include a first pipe and two extension pipes, the first pipe is arranged on the connecting pipe, and the two extension pipes are arranged on the outer side of the connecting pipe in a mirror manner; the compression ejection structure includes multiple conical structure through holes, the conical structure through holes are respectively arranged on the first pipe and the extension pipe, and are interconnected; the conical structure through holes are provided with an outlet; the outlet is arranged on the surface of the chip groove.

[0012] As a further improvement, the conical structure through hole includes a large-diameter compression part and a small-diameter injection part, the large-diameter compression part is connected to the first pipeline and the extension pipeline, the small-diameter injection part is arranged on the large-diameter compression part, and the small-diameter injection part is connected to the outlet.

[0013] As a further improvement, the knife handle is provided with a connecting pipe, and the connecting pipe is connected to the collecting pipe; the connecting pipe is provided with a connecting port, and the connecting port has an inclined surface; the outer side surface of the knife handle is also provided with a mounting plane.

[0014] As a further improvement, the connecting pipes are all spiral structures following the linear direction of the chip groove; the spiral blades are all provided with cutting edges, and the tail ends of the spiral blades are all provided with flat blades.

[0015] A method for manufacturing the multi-edge milling cutter includes the following steps:

[0016] (1) Main body manufacturing: 3D additive printing technology is used to manufacture the rod body, and the connecting pipes and auxiliary pipeline structures are formed to form the milling cutter body;

[0017] (2) Hardness processing: Fill the connecting pipe and the auxiliary pipe structure with high temperature resistant graphite powder, and use welding to seal the orifice. After the sealing is completed, the milling cutter body after sealing is immersed in the hardening liquid, and then put into the high temperature furnace for the first melting process, so that the hardening coating and the milling cutter body are integrated; after the first melting is completed, the milling cutter body is immersed in the hardening liquid, and then taken out for the second hardening coating melting process; after the second hardening process is completed, it is cooled and placed;

[0018] (3) Contour machining: After hardening, the milling cutter body is finely machined. First, the milling cutter body is contour machined into a cylindrical structure, and the welded material is turned out to expose the outlet;

[0019] After the processing is completed, the high-temperature resistant graphite powder filled inside is discharged, and the CNC equipment is used for hole turning processing. The top of the connecting pipe is opened, and then the high-temperature resistant graphite powder inside is discharged, and then the inclined surface of the connecting port is processed. After the processing is completed;

[0020] CNC precision engraving equipment is used to mill the chip grooves and sharpen the blades to form spiral blades;

[0021] (4) Secondary processing: Processing of cutting edge and flat blade, passivation after processing, and finally passivation, heat treatment and pickling to obtain the rough milling cutter body;

[0022] (5) Polishing: Polishing the milling cutter body after contour processing using polishing equipment; ultrasonic cleaning is performed after polishing;

[0023] (6) Coating treatment: The outlet is blocked by using a 1-5 mm thin steel wire. After the blocking is completed, the milling cutter body is repeatedly immersed in the high temperature resistant coating solution for 20 times, and then placed in an oven for drying at a temperature between 200 and 300 °C.

[0024] After completion, the milling cutter body is placed in the corrosion-resistant coating solution and repeatedly immersed 20 times, and then taken out and placed in an oven for drying at a temperature between 100 and 150°C;

[0025] Then remove the thin steel wire and proceed to the next step;

[0026] (7) Quenching and cooling: The milling cutter body is quenched and cooled twice. The first time, the milling cutter is placed in a 500-750°C salt bath furnace for quenching and cooling. After keeping warm for 3-8 minutes, it is transferred to a 200-450°C nitrate furnace for quenching and cooling. After cooling in stages until there are no shrinkage cavities, bubbles, peeling, cracks and inclusions on the surface, it is taken out and subjected to hot pressing treatment;

[0027] (8) Cleaning: Clean the milling cutter body after processing to obtain a multi-blade milling cutter.

[0028] As a further improvement, the (3) also includes the following steps: marking the outlet position of the same connecting pipe to form a linear line, then using CNC equipment to process the chip groove, and processing to form the first spiral blade, then using the first spiral blade as a reference blade band, and then processing another blade band to form a rough cutter head.

[0029] As a further improvement, the diameter of the outlet is 0.5mm-3mm.

[0030] The beneficial effects of the present invention are as follows: the present invention prevents the chip removal groove from residual debris by setting an auxiliary pipeline structure for chip removal, thereby ensuring the cleanliness of the cutter head; the conical structure through hole composed of a large-diameter compression part and a small-diameter injection part is used for spraying lubricants or cleaning agents, and a large-diameter compression part and a small-diameter injection part are used for compression, thereby increasing the impact force, improving the chip removal performance, and greatly preventing impurities from adhering or getting stuck in the chip removal groove due to high temperature during cutting by the multi-blade milling cutter, preventing blockage, thereby ensuring cutting performance and efficiency, and extending the service life.

[0031] The invention also discloses a manufacturing method, which greatly ensures the production efficiency and stability of the multi-blade milling cutter, ensures the performance of the blade milling cutter and prolongs the service life of the multi-blade milling cutter.

[0032] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0034] Figure 1 This is a schematic diagram of the overall structure of the multi-edge milling cutter of this embodiment;

[0035] Figure 2 It is a schematic diagram of the left side view of the multi-edge milling cutter of this embodiment;

[0036] Figure 3 is a schematic diagram of a right side view of the multi-edge milling cutter of this embodiment;

[0037] Figure 4 It is a cross-sectional schematic diagram of the connection between one of the pipeline groups 1 and the connecting pipeline in this embodiment;

[0038] Figure 5 4 is a flow chart of the manufacturing method of the multi-edge milling cutter in this embodiment. DETAILED DESCRIPTION

[0039] The following descriptions are merely preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention.

[0040] For example, see the attached Figure 1 to Figure 5A multi-blade milling cutter includes a milling cutter body 1, the milling cutter body 1 includes a shank 2 and a cutter head 3, the cutter head 3 is fixedly connected to one end of the shank 2; the outer side of the cutter head 3 is provided with a plurality of spirally arranged spiral blades 4; the ends of the cutter head 3 are provided with chip removal ports 5; the cutter head 3 is also provided with a chip removal assisting lubrication structure 6; the surface of the cutter head 3 is provided with a hardened coating.

[0041] The auxiliary chip removal lubrication structure 6 includes a plurality of chip removal grooves 60 and an auxiliary pipeline structure 61. The plurality of chip removal grooves 60 are respectively arranged in a spiral manner between the two spiral blades 4. The chip removal grooves 60 are respectively connected to the chip removal ports 5. The auxiliary pipeline structure 61 is arranged in the cutter head 3.

[0042] The auxiliary pipeline structure 61 includes a collecting pipe 610, and the collecting pipe 610 is provided with a plurality of connecting pipes 611. The connecting pipes 611 are respectively arranged below the chip groove 60, and the connecting pipe 611 includes a corner part and a spiral part. The corner part is used to connect the collecting pipe 610 and the spiral part. The spiral part is arranged below the chip groove 60 in a spiral manner; the connecting pipe 611 is provided with a plurality of pipe groups 612, and the pipe groups 612 are arranged on the connecting pipe 611 in a linear array. The pipe groups 612 are provided with a compression ejection structure 613. The auxiliary pipeline structure 61 is used for chip removal to prevent the chip groove 60 from residual debris, thereby ensuring the cleanliness of the cutter head 3, ensuring the cutting efficiency and processing efficiency, and extending the service life of the multi-blade milling cutter.

[0043] The plurality of pipe groups 612 are arranged in an array on the connecting pipe 611; the plurality of pipe groups 612 each include a first pipe 614 and two extension pipes 615, the first pipe 614 is arranged on the connecting pipe 611, and the two extension pipes 615 are arranged on the outer surface of the connecting pipe 611 in a mirrored manner; the compression ejection structure 613 includes a plurality of conical structure through holes 616, the conical structure through holes 616 are respectively arranged on the first pipe 614 and the extension pipe 615, and are interconnected; the conical structure through holes 616 are provided with an outlet 616a; the outlet 616a is arranged on the surface of the chip groove 60; the diameter of the outlet 616a is 0.5mm-3mm.

[0044] The conical structure through hole 616 includes a large-diameter compression part 617 and a small-diameter injection part 618. The large-diameter compression part 617 is connected to the first pipe 614 and the extension pipe 615. The small-diameter injection part 618 is arranged on the large-diameter compression part 617, and the small-diameter injection part 618 is connected to the outlet 616a. The conical structure through hole 616 is used for spraying lubricants or cleaning agents. The large-diameter compression part 617 and the small-diameter injection part 618 are used for compression to increase the impact force, improve the chip removal performance, and greatly prevent impurities from being adhered or stuck in the chip removal groove 60 due to high temperature during cutting by the multi-blade milling cutter, thereby preventing blockage and ensuring cutting performance and efficiency.

[0045] The tool handle 2 is provided with a connecting pipe 20, and the connecting pipe 20 is connected to the collecting pipe 610; the connecting pipe 20 is provided with a connecting port 200, and the connecting port 200 has an inverted inclined surface. The connecting pipe 611 is used for the inflow of lubricant or cleaning agent, and the connecting port 200 is used to connect with the pipeline of an external liquid supply device; the outer side surface of the tool handle 2 is also provided with a mounting plane 21, and the mounting plane 21 is used for positioning and fixing during installation.

[0046] The connecting pipes 611 are all spiral structures following the linear direction of the chip groove 60; the spiral blades 4 are all provided with cutting edges 40, and the tail ends of the spiral blades 4 are all provided with flat blades 41, and the cutting edges 40 and flat blades 41 are used for chip cutting.

[0047] A method for manufacturing the multi-edge milling cutter includes the following steps:

[0048] (1) Main body manufacturing: The rod body is manufactured by using 3D additive printing technology, and the connecting pipe 611 and the auxiliary pipeline structure 61 are formed, and the milling cutter body 1 is formed after the forming;

[0049] (2) Hardness processing: high temperature resistant graphite powder is filled in the connecting pipe 20 and the auxiliary pipe structure 61, and the orifice is sealed by welding. After the sealing is completed, the milling cutter body 1 is immersed in a hardening liquid, and then placed in a high temperature furnace for a first sintering process, so that the hardened coating and the milling cutter body 1 are integrated; after the first sintering is completed, the milling cutter body 1 is immersed in a hardening liquid, and then taken out for a second hardening coating sintering process; after the second hardening process is completed, it is cooled and placed;

[0050] (3) Contour machining: The milling cutter body 1 after hardening is finely machined. First, the milling cutter body 1 is contour machined into a cylindrical structure, and the welded material is turned out so that the outlet 616a is exposed;

[0051] After the processing is completed, the high temperature resistant graphite powder filled inside is discharged, and the CNC equipment is used for hole turning processing, the top of the connecting pipe 20 is opened, and then the high temperature resistant graphite powder inside is discharged, and then the inclined surface processing of the connecting port 200 is completed;

[0052] The chip groove 60 is milled by using CNC precision engraving equipment, and the spiral blade 4 is formed by sharpening the blade;

[0053] (4) Secondary processing: machining the cutting edge 4 and the flat blade 41, performing passivation treatment after the machining is completed, and finally performing passivation, heat treatment and pickling to obtain the rough milling cutter body 1;

[0054] (5) Polishing: The milling cutter body 1 after the contour processing is polished by a polishing device; ultrasonic cleaning is performed after the polishing is completed;

[0055] (6) Coating treatment: The outlet 616a is blocked by using a 1-5 mm thin steel wire. After the blocking is completed, the milling cutter body 1 is repeatedly immersed in the high temperature resistant coating solution for 20 times, and then taken out and placed in an oven for drying at a drying temperature between 200 and 300°C.

[0056] After completion, the milling cutter body 1 is placed in the corrosion-resistant coating solution and repeatedly immersed 20 times, and then taken out and placed in an oven for drying at a drying temperature between 100 and 150°C;

[0057] Then remove the thin steel wire and proceed to the next step;

[0058] (7) Quenching and cooling: The milling cutter body 1 is quenched and cooled twice. The first time, the milling cutter is placed in a 500-750°C salt bath furnace for quenching and cooling. After keeping the temperature for 3-8 minutes, it is transferred to a 200-450°C nitrate furnace for quenching and cooling. After cooling in stages until there are no shrinkage cavities, bubbles, peeling, cracks and inclusions on the surface, it is taken out and subjected to hot pressing treatment;

[0059] (8) Cleaning: Clean the milling cutter body 1 after processing to obtain a multi-blade milling cutter.

[0060] The (3) also includes the following steps: marking the position of the outlet 616a of the same connecting pipe 611 to form a linear line, then using CNC equipment to process the chip groove 60, and processing to form the first spiral blade 4, and then using the first spiral blade 4 as a reference blade band, and then processing another blade band to form a rough cutter head 3.

[0061] The present invention provides an auxiliary pipeline structure for chip removal, thereby preventing debris from remaining in the chip removal groove, thereby ensuring the cleanliness of the cutter head; a conical structure through hole composed of a large-diameter compression part and a small-diameter injection part is used for spraying lubricants or cleaning agents, and a large-diameter compression part and a small-diameter injection part are used for compression, thereby increasing the impact force, improving the chip removal performance, and greatly preventing impurities from adhering or getting stuck in the chip removal groove due to high temperature during cutting by the multi-blade milling cutter, preventing blockage, thereby ensuring cutting performance and efficiency, and extending the service life.

[0062] The present invention is not limited to the above-mentioned embodiments. Other multi-blade milling cutters and manufacturing methods thereof obtained by using the same or similar structures, devices, processes or methods as the above-mentioned embodiments of the present invention are within the protection scope of the present invention.

Claims

1. A multi-edge milling cutter, comprising a milling cutter body, wherein the milling cutter body comprises a shank and a cutter head, wherein: The cutter head is fixedly connected to one end of the handle; a plurality of spiral blades arranged in a spiral manner are provided on the outer side of the cutter head; a chip removal opening is provided at each end of the cutter head; the cutter head is also provided with a lubrication structure to assist in chip removal; and a hardened coating is provided on the surface of the cutter head.

2. The multi-edge milling cutter according to claim 1, characterized in that: The auxiliary chip removal lubrication structure includes a plurality of chip removal grooves and an auxiliary pipeline structure. The plurality of chip removal grooves are respectively arranged in a spiral manner between the two spiral blades, and the chip removal grooves are respectively connected to the chip removal ports; the auxiliary pipeline structure is arranged in the cutter head.

3. The multi-edge milling cutter according to claim 2, characterized in that: The auxiliary pipeline structure includes a collecting pipe, which is provided with a plurality of connecting pipes, and the connecting pipes are respectively arranged below the chip discharge grooves; the connecting pipes are provided with a plurality of pipe groups, and the pipe groups are provided with a compression ejection structure.

4. The multi-edge milling cutter according to claim 3, characterized in that: A plurality of the pipe groups 1 are arranged in an array on the connecting pipe; the plurality of the pipe groups 1 each include a first pipe and two extension pipes, the first pipe is arranged on the connecting pipe, and the two extension pipes are arranged on the outer side of the connecting pipe in a mirrored manner; the compression ejection structure includes a plurality of conical structure through holes, the conical structure through holes are respectively arranged on the first pipe and the extension pipe, and are interconnected; the conical structure through holes are provided with an outlet; the outlet is arranged on the surface of the chip removal groove.

5. The multi-edge milling cutter according to claim 4, characterized in that: The conical structure through hole includes a large-diameter compression part and a small-diameter injection part, the large-diameter compression part is connected to the first pipeline and the extension pipeline, the small-diameter injection part is arranged on the large-diameter compression part, and the small-diameter injection part is connected to the outlet.

6. The multi-edge milling cutter according to claim 5, characterized in that: The knife handle is provided with a connecting pipe, and the connecting pipe is connected to the collecting pipe; the connecting pipe is provided with a connecting port, and the connecting port has an inclined surface; the outer side surface of the knife handle is also provided with a mounting plane.

7. The multi-edge milling cutter according to claim 6, characterized in that: The connecting pipes are all spiral structures following the linear direction of the chip removal groove; the spiral blades are all provided with cutting edges, and the tail ends of the spiral blades are all provided with flat blades.

8. A method for manufacturing a multi-edge milling cutter according to any one of claims 1 to 7, characterized in that: It includes the following steps: (1) Main body manufacturing: 3D additive printing technology is used to manufacture the rod body, and the connecting pipes and auxiliary pipeline structures are formed to form the milling cutter body; (2) Hardness processing: Fill the connecting pipe and the auxiliary pipe structure with high temperature resistant graphite powder, and use welding to seal the orifice. After the sealing is completed, the milling cutter body after sealing is immersed in the hardening liquid, and then put into the high temperature furnace for the first melting process, so that the hardening coating and the milling cutter body are integrated; after the first melting is completed, the milling cutter body is immersed in the hardening liquid, and then taken out for the second hardening coating melting process; after the second hardening process is completed, it is cooled and placed; (3) Contour machining: After hardening, the milling cutter body is finely machined. First, the milling cutter body is contour machined into a cylindrical structure, and the welded material is turned out to expose the outlet; After the processing is completed, the high-temperature resistant graphite powder filled inside is discharged, and the CNC equipment is used for hole turning processing. The top of the connecting pipe is opened, and then the high-temperature resistant graphite powder inside is discharged, and then the inclined surface of the connecting port is processed. After the processing is completed; CNC precision engraving equipment is used to mill the chip grooves and sharpen the blades to form spiral blades; (4) Secondary processing: Processing of cutting edge and flat blade, passivation after processing, and finally passivation, heat treatment and pickling to obtain the rough milling cutter body; (5) Polishing: Polishing the milling cutter body after contour processing using polishing equipment; ultrasonic cleaning is performed after polishing; (6) Coating treatment: The outlet is blocked by using a 1-5 mm thin steel wire. After the blocking is completed, the milling cutter body is repeatedly immersed in the high temperature resistant coating solution for 20 times, and then placed in an oven for drying at a temperature between 200 and 300 °C. After completion, the milling cutter body is placed in the corrosion-resistant coating solution and repeatedly immersed 20 times, and then taken out and placed in an oven for drying at a temperature between 100 and 150°C; Then remove the thin steel wire and proceed to the next step; (7) Quenching and cooling: The milling cutter body is quenched and cooled twice. The first time, the milling cutter is placed in a 500-750°C salt bath furnace for quenching and cooling. After keeping warm for 3-8 minutes, it is transferred to a 200-450°C nitrate furnace for quenching and cooling. After cooling in stages until there are no shrinkage cavities, bubbles, peeling, cracks and inclusions on the surface, it is taken out and subjected to hot pressing treatment; (8) Cleaning: Clean the milling cutter body after processing to obtain a multi-blade milling cutter.

9. The manufacturing method according to claim 8, characterized in that: The above (3) also The method comprises the following steps: marking the outlet position of the same connecting pipe to form a linear line, then using CNC equipment to process the chip groove, and processing to form the first spiral blade, then using the first spiral blade as a reference blade band, and then processing another blade band to form a rough cutter head.

10. The multi-edge milling cutter according to claim 7, characterized in that: The diameter of the outlet is 0.5 mm-3 mm.

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