Rough machining indexable CBN milling cutter

Abstract

The utility model discloses an indexable CBN milling cutter for rough machining, which relates to the technical field of milling cutters, and comprises a hard alloy cutter bar and an alloy cutter, the bottom surface of the hard alloy cutter bar is fixedly connected with a fixed disc, the middle part of the bottom surface of the fixed disc is fixedly connected with an inserting rod, and the middle part of the upper surface of the alloy cutter is provided with an inserting hole in a penetrating manner; clamping grooves are formed in the front side and the rear side of the upper end of the inserting hole, torque transmission strips are fixedly connected to the front side and the rear side of the inserting rod and the lower portion of the fixing disc, the torque transmission strips are clamped into the clamping grooves, at least eight sets of chip grooves are formed in the lower end of the alloy cutter, and cutter grooves are formed in the chip grooves. And a CBN blade is fixedly connected to the interior of the cutter groove through a screw. The milling cutter has the advantages that the damaged blade can be independently detached and replaced, the milling cutter does not need to be integrally replaced, the maintenance and replacement cost of the cutter can be remarkably reduced, the downtime is shortened, and the machining adaptability is improved.

Description

Technical Field

[0001] This utility model relates to the field of milling cutter technology, specifically to a roughing indexable CBN milling cutter. Background Technology

[0002] Milling cutters are one of the most important cutting tools used in machining processes for surfaces, holes, and other structures, and are used in large quantities. CBN milling cutters are mainly used for machining ferrous high-hardness metals, such as hardened steel and cast steel (iron). They can withstand high temperatures (above 1000 degrees Celsius) and their hardness remains at 8000 HV, making them a good tool material for improving production efficiency and machining difficult-to-machine materials.

[0003] For example, Chinese patent (CN217070893U) provides a CBN end mill with chip breaker grooves, including a tool shank. One end of the tool shank has an angled welding groove, and CBN cutting teeth are brazed into the angled welding groove. The lower part of the CBN cutting teeth is provided with a clearance angle, the tip of the CBN cutting teeth is provided with a blunt fillet, and the upper part of the CBN cutting teeth is provided with a negative chamfer and chip breaker grooves. This CBN end mill with chip breaker grooves, by providing a negative chamfer and chip breaker groove structure on the CBN cutting teeth, can increase its impact resistance by using the negative chamfer and blunt fillet, and the chip breaker grooves can make the chips break in time, protecting the machined surface, thereby improving dimensional accuracy and preventing long chips from wrapping around the tool and causing tool breakage, thus significantly extending the end mill's service life.

[0004] The aforementioned CBN cutting teeth are welded inside the inclined welding groove. Due to the small thickness of the cutting edge, the cutting edge is easily damaged during machining. Once damaged, the CBN end mill needs to be replaced as a whole, making it difficult to reuse and resulting in waste. Furthermore, the torque is transmitted through the tool holder, and the magnitude of the transmitted torque is limited by the material of the tool holder. If the material of the tool holder is not strong enough, it may cause the tool holder to bend or break under high torque, thereby affecting the machining stability and safety. To address the above problems, a roughing indexable CBN end mill is proposed to solve the problem. Utility Model Content

[0005] To address the aforementioned technical problems, a roughing indexable CBN end mill is provided. This solves the problems of the current CBN end mills where the teeth are welded inside the inclined welding groove. Due to the small thickness of the cutting edge, the end mill is easily damaged during machining. Once damaged, the entire CBN end mill needs to be replaced, making it difficult to reuse and resulting in waste. Furthermore, the torque is transmitted through the tool holder, and the magnitude of the transmitted torque is limited by the material of the tool holder. If the material of the tool holder is not strong enough, it may bend or break under high torque, thus affecting the stability and safety of machining.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a roughing indexable CBN end mill, comprising a carbide tool holder and a carbide cutting tool, wherein a fixed plate is fixedly connected to the bottom surface of the carbide tool holder, a connecting rod is fixedly connected to the middle of the bottom surface of the fixed plate, a connecting hole is formed through the middle of the upper surface of the carbide cutting tool, and slots are formed on both the front and rear sides of the upper end of the connecting hole, and torque transmission strips are fixedly connected to the front and rear sides of the connecting rod and the lower part of the fixed plate, the torque transmission strips are engaged in the slots, and at least eight sets of chip removal grooves are formed at the lower end of the carbide cutting tool, and tool grooves are provided inside the chip removal grooves, and CBN cutting tools are fixedly connected inside the tool grooves by screws.

[0007] Preferably, the upper surface of the alloy cutting tool is provided with four positioning holes on the outside of the insertion hole, and the bottom of the alloy cutting tool is provided with mounting holes at positions corresponding to the positioning holes, and the mounting holes are connected to the positioning holes.

[0008] Preferably, a fixing rod is fixedly connected to the bottom of the fixing plate at the position corresponding to the positioning hole, and a fastening nut is threaded to the outer side of the bottom end of the fixing rod, and the fastening nut is set inside the mounting hole.

[0009] Preferably, the upper end of the CBN blade is inclined relative to the lower end of the CBN blade, with an inclination angle of three to five degrees.

[0010] Preferably, the CBN blade is quadrilateral, hexagonal, or octagonal in shape.

[0011] Preferably, the alloy cutting tool is made of the same material as the CBN cutting tool, and its surface is treated with hard chrome plating or nitriding.

[0012] Preferably, the inclination angle of the chip discharge groove is 10 to 15 degrees, and the top and side surfaces of the chip discharge groove are coated with a wear-resistant coating.

[0013] Compared with the prior art, the advantages of this utility model are:

[0014] This invention utilizes a suitable chip removal groove and secures the CBN insert in the groove with screws. When an insert is damaged, it can be removed and replaced individually without replacing the entire milling cutter. This significantly reduces tool maintenance and replacement costs and downtime, as replacing an insert is faster than replacing the entire milling cutter, thereby improving production efficiency. Furthermore, it allows for flexible adjustment and replacement of different types of inserts based on actual wear and requirements, enhancing machining adaptability.

[0015] This invention transmits torque from the motor to the alloy cutting tool by combining a torque transmission bar, a slot, and a fixing rod. The torque transmission bar, slot, and fixing rod can evenly distribute the torque on the contact surface of the tool, reducing local stress concentration and lowering the risk of tool damage. Different materials can be selected for the torque transmission bar, slot, and fixing rod to optimize the torque transmission effect and system stability. The choice of tool holder material is usually limited by the overall design and material properties of the tool holder, offering high flexibility and good adaptability. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the carbide tool holder structure in this utility model;

[0018] Figure 3 This is a top view of the alloy cutting tool of this utility model;

[0019] Figure 4 This is a bottom view of the alloy cutting tool in this utility model;

[0020] Figure 5 This is a schematic diagram of the structure of the alloy cutting tool for removing CBN inserts in this utility model.

[0021] The numbers on the map are:

[0022] 1. Carbide tool holder; 2. Fixed plate; 3. Connecting rod; 4. Torque transmission bar; 5. Fixed rod; 6. Fastening nut; 7. Carbide cutting tool; 8. Connecting hole; 9. Slot; 10. Positioning hole; 11. Mounting hole; 12. Tool groove; 13. Screw; 14. CBN insert; 15. Chip removal groove. Detailed Implementation

[0023] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0024] Reference Figure 1-5As shown, a roughing indexable CBN end mill includes a carbide tool holder 1 and a carbide cutting tool 7. A fixed plate 2 is fixedly connected to the bottom surface of the carbide tool holder 1, and a connecting rod 3 is fixedly connected to the middle of the bottom surface of the fixed plate 2. A connecting hole 8 is opened through the middle of the upper surface of the carbide cutting tool 7. A slot 9 is opened on both the front and rear sides of the upper end of the connecting hole 8. A torque transmission strip 4 is fixedly connected to the front and rear sides of the connecting rod 3 and the lower part of the fixed plate 2. The torque transmission strip 4 is snapped into the slot 9. The combination of the connecting rod 3 and the torque transmission strip 4 realizes a fast and reliable connection between the carbide cutting tool 7 and the carbide tool holder 1. The snap-fit ​​design of the torque transmission strip 4 further enhances the stability of the connection and ensures the effective transmission of torque during the cutting process. At least eight sets of chip removal grooves 15 are opened at the lower end of the carbide cutting tool 7. A tool groove 12 is provided inside the chip removal groove 15. A CBN insert 14 is fixedly connected inside the tool groove 12 by screws 13.

[0025] Specifically, four positioning holes 10 are provided on the upper surface of the alloy cutting tool 7 and the outer side of the insertion hole 8. Mounting holes 11 are provided at the bottom of the alloy cutting tool 7 at the corresponding positions of the positioning holes 10, and the mounting holes 11 are connected to the positioning holes 10.

[0026] Furthermore, a fixing rod 5 is fixedly connected to the bottom of the fixing plate 2 at the position corresponding to the positioning hole 10. A fastening nut 6 is threaded to the outer side of the bottom end of the fixing rod 5. The fastening nut 6 is set inside the mounting hole 11. Through the cooperation of the fixing rod 5 and the fastening nut 6, the alloy tool 7 is reliably fixed, preventing the tool from loosening and falling off during the processing, and ensuring the safety and stability of the processing.

[0027] It is worth noting that the upper end of the CBN insert 14 is inclined relative to the lower end of the CBN insert 14 at an angle of three to five degrees. This inclination helps to improve the distribution of cutting forces, thereby increasing cutting efficiency and machining quality. The three to five-degree inclination angle is an optimized design that ensures cutting performance while avoiding damage to the tool from excessive cutting forces.

[0028] In one embodiment, the CBN insert 14 is quadrilateral, hexagonal, or octagonal in shape. The quadrilateral, hexagonal, or octagonal insert shape design provides a variety of cutting edge options to suit different machining needs and material properties, enhancing the adaptability and flexibility of the tool.

[0029] Preferably, the alloy cutting tool 7 is made of the same material as the CBN insert 14, and its surface is treated with hard chrome plating or nitriding. Using the same material and hard chrome plating or nitriding as the CBN insert 14 improves the tool's hardness and wear resistance, extending its service life. Simultaneously, this treatment also enhances the tool's corrosion resistance and high-temperature resistance.

[0030] Preferably, the inclination angle of the inclined surface of the chip removal groove 15 is 10 to 15 degrees, and the top and side surfaces of the chip removal groove 15 are coated with a wear-resistant coating. The inclination angle of the chip removal groove 15 is designed to be 10 to 15 degrees, which helps the chips to be discharged more smoothly, reduces the heat accumulation and cutting force in the cutting area, and improves the stability and efficiency of the machining process. The wear-resistant coating on the top and side surfaces further enhances the durability of the chip removal groove 15 and extends the maintenance cycle of the tool.

[0031] Working principle: The CBN insert 14 is fixed in the chip removal groove 15 by screw 13. When a insert is damaged, the damaged insert can be removed and replaced separately without replacing the entire milling cutter, which can significantly reduce the cost of tool maintenance and replacement. The torque transmission bar 4, the slot 9 and the fixing rod 5 work together to transmit the torque from the motor to the alloy tool 7. The torque transmission bar 4, the slot 9 and the fixing rod 5 can evenly distribute the torque on the contact surface of the tool, reduce local stress concentration and reduce the risk of tool damage.

[0032] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A roughing indexable CBN end mill, characterized in that: The tool includes a carbide tool holder (1) and a carbide cutting tool (7). The bottom surface of the carbide tool holder (1) is fixedly connected to a fixed plate (2). The bottom surface of the fixed plate (2) is fixedly connected to a plug rod (3). The upper surface of the carbide cutting tool (7) is provided with a plug hole (8) through the middle. The plug hole (8) is provided with slots (9) on both the front and rear sides. The plug rod (3) is fixedly connected to the bottom of the fixed plate (2) on both the front and rear sides. The torque transmission strip (4) is engaged in the slot (9). The lower end of the carbide cutting tool (7) is provided with at least eight sets of chip removal grooves (15). The chip removal grooves (15) are provided with a cutting groove (12). The cutting groove (12) is fixedly connected with a CBN cutting tool (14) by a screw (13).

2. The roughing indexable CBN end mill according to claim 1, characterized in that: The alloy cutting tool (7) has four positioning holes (10) on its upper surface and outside the insertion hole (8). The bottom of the alloy cutting tool (7) has mounting holes (11) at the corresponding positions of the positioning holes (10). The mounting holes (11) are connected to the positioning holes (10).

3. The roughing indexable CBN end mill according to claim 1, characterized in that: The bottom of the fixed plate (2) is fixedly connected to a fixed rod (5) at the position corresponding to the positioning hole (10). The bottom of the fixed rod (5) is threaded with a fastening nut (6), which is located inside the mounting hole (11).

4. The roughing indexable CBN end mill according to claim 1, characterized in that: The upper end of the CBN blade (14) is inclined relative to the lower end of the CBN blade (14) by an angle of three to five degrees.

5. The roughing indexable CBN end mill according to claim 1, characterized in that: The CBN blade (14) is quadrilateral, hexagonal, or octagonal in shape.

6. The roughing indexable CBN end mill according to claim 1, characterized in that: The alloy cutting tool (7) is made of the same material as the CBN cutting tool (14), and its surface is treated with hard chrome plating or nitriding.

7. A roughing indexable CBN end mill according to claim 1, characterized in that: The inclined angle of the inclined surface of the chip removal groove (15) is 10 to 15 degrees, and the top and side surfaces of the chip removal groove (15) are coated with a wear-resistant coating.

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