A coated tungsten steel end mill suitable for machining of high hardness materials

Abstract

The utility model relates to tungsten steel end mill technical field, and disclose a kind of coating tungsten steel end mill suitable for high hardness material processing, including end mill handle, the inside telescopic connection of end mill handle has buffer rod, the inside of end mill handle is equipped with the buffer assembly for to end mill buffering, the end of buffer assembly is equipped with quick release assembly for quick release, the side of quick release assembly is equipped with cooling assembly for to end mill cooling;The buffer assembly includes limit piston, limit slot, buffer spring, hydraulic chamber.The utility model can promote limit piston to slide in limit slot by buffer rod, limit piston extrudes hydraulic oil stored in the cavity inside end mill handle, and the hydraulic oil after compression enters hydraulic chamber, while limit piston will promote buffer spring to compress, and further play certain buffering effect, effectively reduce the situation that coating peeling occurs in the combination interface between coating and matrix due to stress concentration of axial force to end mill body.

Description

Technical Field

[0001] This utility model relates to the field of tungsten carbide end mills, specifically a coated tungsten carbide end mill suitable for machining high-hardness materials. Background Technology

[0002] Coated tungsten carbide end mills are precision cutting tools specifically designed for machining high-hardness materials. Their core advantage lies in significantly improving the tool's wear resistance, heat resistance, and cutting efficiency by coating a high-performance thin film onto the surface of a cemented carbide (tungsten carbide) substrate. They utilize an ultra-fine grain tungsten carbide and cobalt alloy, with a cobalt content typically between 3% and 10%. Low-cobalt (3%-6%) formulations offer higher hardness and are suitable for finishing hardened steels or titanium alloys with a hardness of HRC50 or higher; high-cobalt formulations offer greater toughness and are suitable for interrupted cutting or heavy-duty machining.

[0003] In the prior art, such as the coated tapered shank end mill disclosed in CN215392729U, a milling cutter includes a milling post, chip relief grooves, milling cutting edges, a water spray nozzle, a connecting post, a base, a first fixing screw hole, a water injection chamber, a connecting seat, a mating plate, a locking screw, a water injection column, a washer, a tapered shank, a limiting groove, and a second fixing screw hole. It rapidly discharges milling chips generated during milling through the chip relief grooves. Milling cutting edges are provided on the sidewalls of the milling post, located between two adjacent chip relief grooves. A tungsten carbide coating is sprayed onto both the milling cutting edges and the sidewalls of the milling post connected to the milling cutting edges to ensure the wear resistance of the milling cutting edges. A water spray nozzle is recessed at the top of the milling post to clean the milling chips generated during milling.

[0004] Existing milling cutters use chip relief grooves to quickly remove chips generated during milling. Milling cutting edges are provided on the side walls of the milling cutter post. The milling cutting edges and the side walls of the milling cutter post connected to the milling cutting edges are coated with a layer of tungsten steel to ensure the wear resistance of the milling cutting edges. However, although the coating is wear-resistant, its impact resistance is limited. When the milling cutter is fed axially, stress concentration occurs at the interface between the coating and the substrate, which can easily lead to coating peeling and cracking. After losing its protective function, the substrate directly rubs against the workpiece, further accelerating tool wear. Utility Model Content

[0005] Given that the existing technology has the problem that although the coating is wear-resistant, its impact resistance is limited, and stress concentration occurs at the interface between the coating and the substrate when the milling cutter is fed axially, the coating is prone to peeling and cracking. After losing its protective function, the substrate directly rubs against the workpiece, which further accelerates the wear of the tool.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A coated tungsten carbide end mill suitable for machining high-hardness materials includes a milling cutter shank, a buffer rod telescopically connected inside the milling cutter shank, a buffer assembly for buffering the milling cutter inside the milling cutter shank, a quick-release assembly for quick release at the end of the buffer assembly, and a cooling assembly for cooling the milling cutter on one side of the quick-release assembly. The buffer assembly includes a limiting piston, a limiting groove, a buffer spring, a hydraulic chamber, a connecting piece, and a milling cutter body. The limiting piston is slidably installed inside the milling cutter shank and fixedly connected to the buffer rod. A limiting groove opened on the inner wall of the milling cutter shank is slidably connected to one side of the limiting piston. A buffer spring abuts against the side wall of the limiting piston. A hydraulic chamber is opened on the inner wall of the milling cutter shank.

[0007] As a further improvement of this utility model: a connector is connected to the left side of the buffer rod, and a milling cutter body is fixed to the left side of the connector.

[0008] As a further embodiment of this utility model: the quick-release assembly includes a positioning hole, a fixing bolt, a fixing hole, a limiting block, and a limiting hole, wherein the positioning hole is formed on the side wall of the connector.

[0009] As a further improvement of this utility model: two fixing bolts are symmetrically installed on the outer wall of the connector, and the ends of the two fixing bolts are inserted into fixing holes opened on the buffer rod.

[0010] As a further improvement of this utility model: two limiting blocks are fixed to the end of the buffer rod, and one side of each of the two limiting blocks is engaged with a limiting hole opened on the connector.

[0011] As a further embodiment of this utility model: the cooling assembly includes a water spray hole, a buffer chamber, a conveying pipe and a chip removal groove, the water spray hole is opened at the end of the milling cutter body, and one side of the water spray hole is connected to a buffer chamber opened inside the connector.

[0012] As a further improvement of this utility model: one side of the connector is provided with a conveying pipe that communicates with the buffer cavity, and the outer surface of the milling cutter body is provided with a chip removal groove.

[0013] As a further improvement of this utility model: the outer side of the milling cutter shank is provided with an anti-slip sleeve, and the inner side of the anti-slip sleeve is connected with a retaining strip that is integrally fixed with the milling cutter shank.

[0014] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model uses a buffer rod to push a limiting piston to slide in a limiting groove. The limiting piston squeezes the hydraulic oil stored in the cavity inside the milling cutter shank. The compressed hydraulic oil enters the hydraulic chamber, and the limiting piston pushes the buffer spring to compress, thereby playing a certain buffering role. This effectively reduces the situation where the coating peels off due to stress concentration at the interface between the coating and the substrate caused by axial force on the milling cutter body.

[0015] 2. This utility model allows the connector to be disassembled and replaced by unscrewing the fixing bolts on the connector. The positioning hole provided in the connector can play a positioning role. With the cooperation of the limiting block and the limiting hole, it can play a limiting role and facilitate assembly. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of a coated tungsten carbide end mill suitable for machining high-hardness materials; Figure 2 This is a three-dimensional structural diagram of the cutter body in a coated tungsten carbide end mill suitable for machining high-hardness materials; Figure 3 This is a schematic cross-sectional view of the cutter shank in a coated tungsten carbide end mill suitable for machining high-hardness materials. Figure 4 This is a schematic cross-sectional view of the cutter body in a coated tungsten carbide end mill suitable for machining high-hardness materials. Figure 5 This is a three-dimensional structural diagram of the anti-slip sleeve in a coated tungsten carbide end mill suitable for machining high-hardness materials.

[0017] In the diagram: 1. Milling cutter shank; 2. Buffer rod; 3. Limiting piston; 31. Limiting groove; 32. Buffer spring; 33. Hydraulic chamber; 34. Connecting piece; 35. Milling cutter body; 4. Positioning hole; 41. Fixing bolt; 42. Fixing hole; 43. Limiting block; 44. Limiting hole; 5. Water spray hole; 51. Buffer chamber; 52. Conveying pipe; 53. Chip removal groove; 6. Anti-slip sleeve; 7. Clamping strip. Detailed Implementation

[0018] To make the above-mentioned objectives, features and advantages of this utility model more readily understood, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0019] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0020] Example 1: Please refer to Figures 1-5 This is the first embodiment of the present invention. This embodiment provides a coated tungsten steel end mill suitable for machining high hardness materials, including a milling cutter shank 1. A buffer rod 2 is telescopically connected inside the milling cutter shank 1. A buffer assembly for buffering the milling cutter is provided inside the milling cutter shank 1. A quick-release assembly for quick release is provided at the end of the buffer assembly. A cooling assembly for cooling the milling cutter is provided on one side of the quick-release assembly. The buffer assembly includes a limiting piston 3, a limiting groove 31, a buffer spring 32, a hydraulic chamber 33, a connecting piece 34, and a milling cutter body 35. The limiting piston 3 is slidably installed inside the milling cutter shank 1 and fixedly connected to the buffer rod 2. A limiting groove 31 opened in the inner wall of the milling cutter shank 1 is slidably connected to one side of the limiting piston 3. The side wall of the limiting piston 3 abuts against the buffer spring 32. A hydraulic chamber 33 is opened in the inner wall of the milling cutter shank 1.

[0021] Specifically, a connector 34 is connected to the left side of the buffer rod 2, and a milling cutter body 35 is fixed to the left side of the connector 34.

[0022] Furthermore, the limiting piston 3 pushes the buffer spring 32 to compress, thereby playing a certain buffering role and effectively reducing the situation where the coating peels off due to stress concentration at the interface between the coating and the substrate caused by axial force on the milling cutter body 35.

[0023] Specifically, the quick-release assembly includes a positioning hole 4, a fixing bolt 41, a fixing hole 42, a limiting block 43, and a limiting hole 44. The positioning hole 4 is located on the side wall of the connector 34.

[0024] Furthermore, unscrew the fixing bolt 41 on the connector 34 to separate the end of the fixing bolt 41 from the fixing hole 42 on the buffer rod 2.

[0025] In use, place the milling cutter shank 1 in a suitable position, and then, through the retaining strip 7 provided on the milling cutter shank 1, align the anti-slip sleeve 6 with the retaining strip 7 and push it horizontally to assemble the anti-slip sleeve 6 onto the milling cutter shank 1. Then, connect and fix the anti-slip sleeve 6 to the feed end of the machine tool. The machine tool drives the milling cutter shank 1 to feed, thereby performing cutting operations on the workpiece. Through the buffer rod 2 provided inside the milling cutter shank 1, when the milling cutter body 35 is fed too fast and collides, the buffer rod 2 can push the limit piston 3 to slide in the limit groove 31. At this time, the limit piston 3 squeezes the hydraulic oil stored in the cavity inside the milling cutter shank 1, so that the compressed hydraulic oil enters the hydraulic chamber 33. At the same time, the limit piston 3 will push the buffer spring 32 to compress, thereby playing a certain buffering role and effectively reducing the situation where the coating peels off due to stress concentration at the interface between the coating and the substrate caused by axial force on the milling cutter body 35.

[0026] In summary, when using this coated tungsten steel end mill suitable for machining high-hardness materials, the buffer rod 2 can push the limiting piston 3 to slide within the limiting groove 31. The limiting piston 3 squeezes the hydraulic oil stored in the internal cavity of the end mill shank 1, and the compressed hydraulic oil enters the hydraulic chamber 33. The limiting piston 3 will push the buffer spring 32 to compress, thereby playing a certain buffering role and effectively reducing the situation where the coating peels off due to stress concentration at the interface between the coating and the substrate caused by axial force on the end mill body 35.

[0027] Example 2: Please refer to Figures 1-5 This is the second embodiment of the present utility model.

[0028] Specifically, two fixing bolts 41 are symmetrically installed on the outer wall of the connector 34. The ends of the two fixing bolts 41 are inserted into fixing holes 42 opened on the buffer rod 2. Two limiting blocks 43 are fixed to the ends of the buffer rod 2. The limiting holes 44 opened on the connector 34 are snapped into one side of each limiting block 43.

[0029] Furthermore, the positioning hole 4 provided in the connector 34 can play a positioning role. With the cooperation of the limiting block 43 and the limiting hole 44, it can play a limiting role, which facilitates assembly.

[0030] Specifically, the cooling assembly includes a water spray hole 5, a buffer chamber 51, a delivery pipe 52, and a chip removal groove 53. The water spray hole 5 is located at the end of the milling cutter body 35. One side of the water spray hole 5 is connected to the buffer chamber 51 located inside the connector 34. One side of the connector 34 is provided with a delivery pipe 52 that is connected to the buffer chamber 51. The outer surface of the milling cutter body 35 is provided with a chip removal groove 53. The outside of the milling cutter shank 1 is covered with an anti-slip sleeve 6. The inner side of the anti-slip sleeve 6 is connected with a retaining strip 7 that is integrally fixed to the milling cutter shank 1.

[0031] Furthermore, the coolant enters the buffer chamber 51 inside the connector 34 through the delivery pipe 52, and then is sprayed out through the water spray hole 5, thereby spraying water to cool the contact surface between the workpiece and the milling cutter body 35.

[0032] In use, the delivery pipe 52 is connected to an external coolant delivery device, allowing the coolant to enter the buffer chamber 51 inside the connector 34 through the delivery pipe 52, and then be sprayed out through the water spray hole 5 to cool the contact surface between the workpiece and the milling cutter body 35. The chip removal groove 53 facilitates the discharge of waste chips generated during cutting. When the milling cutter body 35 needs to be replaced, the fixing bolt 41 on the connector 34 can be unscrewed, allowing the end of the fixing bolt 41 to separate from the fixing hole 42 on the buffer rod 2. At this time, the connector 34 can be disassembled for easy replacement. The positioning hole 4 inside the connector 34 can play a positioning role. With the cooperation of the limiting block 43 and the limiting hole 44, it can play a limiting role, facilitating assembly.

[0033] In summary, when using this coated tungsten carbide end mill suitable for machining high-hardness materials, the buffer rod 2 can push the limiting piston 3 to slide within the limiting groove 31. The limiting piston 3 squeezes the hydraulic oil stored in the internal cavity of the end mill shank 1, and the compressed hydraulic oil enters the hydraulic chamber 33. The limiting piston 3 pushes the buffer spring 32 to compress, thereby playing a certain buffering role. This effectively reduces the stress concentration at the interface between the coating and the substrate caused by axial force on the end mill body 35, which can lead to coating peeling. Furthermore, by unscrewing the fixing bolt 41 on the connector 34, the connector 34 can be disassembled for easy replacement. The positioning hole 4 provided in the connector 34 can play a positioning role. With the cooperation of the limiting block 43 and the limiting hole 44, it can play a limiting role, which facilitates assembly.

[0034] It should be understood that numerous specific implementation decisions can be made during the development of any actual implementation method, and in any engineering or design project. Such development efforts may be complex and time-consuming, but for those of ordinary skill in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0035] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A coated tungsten carbide end mill suitable for machining high-hardness materials, comprising a cutter shank (1), characterized in that: The milling cutter shank (1) is internally telescopically connected to a buffer rod (2). The milling cutter shank (1) is internally provided with a buffer assembly for buffering the milling cutter. The end of the buffer assembly is provided with a quick-release assembly for quick release. One side of the quick-release assembly is provided with a cooling assembly for cooling the milling cutter. The buffer assembly includes a limiting piston (3), a limiting groove (31), a buffer spring (32), a hydraulic chamber (33), a connecting piece (34), and a milling cutter body (35). The limiting piston (3) is slidably installed inside the milling cutter shank (1) and fixedly connected to the buffer rod (2). A limiting groove (31) opened on the inner wall of the milling cutter shank (1) is slidably connected to one side of the limiting piston (3). The side wall of the limiting piston (3) abuts against the buffer spring (32). A hydraulic chamber (33) is opened on the inner wall of the milling cutter shank (1).

2. The coated tungsten carbide end mill for machining high-hardness materials according to claim 1, characterized in that: The left side of the buffer rod (2) is connected to a connector (34), and the left side of the connector (34) is fixed with a milling cutter body (35).

3. A coated tungsten carbide end mill suitable for machining high-hardness materials according to claim 2, characterized in that: The quick-release assembly includes a positioning hole (4), a fixing bolt (41), a fixing hole (42), a limiting block (43), and a limiting hole (44), wherein the positioning hole (4) is formed on the side wall of the connector (34).

4. A coated tungsten carbide end mill suitable for machining high-hardness materials according to claim 3, characterized in that: Two fixing bolts (41) are symmetrically installed on the outer wall of the connector (34), and the ends of the two fixing bolts (41) are inserted into fixing holes (42) opened on the buffer rod (2).

5. A coated tungsten carbide end mill suitable for machining high-hardness materials according to claim 4, characterized in that: The buffer rod (2) has two limiting blocks (43) fixed at its end. Each of the two limiting blocks (43) has a limiting hole (44) on one side of the connector (34).

6. A coated tungsten carbide end mill suitable for machining high-hardness materials according to claim 5, characterized in that: The cooling assembly includes a water spray hole (5), a buffer chamber (51), a delivery pipe (52), and a chip removal groove (53). The water spray hole (5) is located at the end of the milling cutter body (35), and one side of the water spray hole (5) is connected to the buffer chamber (51) located inside the connector (34).

7. A coated tungsten carbide end mill suitable for machining high-hardness materials according to claim 6, characterized in that: The connector (34) has a conveying pipe (52) that communicates with the buffer cavity (51) on one side, and the milling cutter body (35) has a chip removal groove (53) on its outer surface.

8. A coated tungsten carbide end mill suitable for machining high-hardness materials according to claim 7, characterized in that: The milling cutter shank (1) is fitted with an anti-slip sleeve (6), and the inner side of the anti-slip sleeve (6) is connected with a retaining strip (7) that is integrally fixed with the milling cutter shank (1).

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