Tungsten steel milling cutter with inner cooling structure

Abstract

The utility model belongs to the technical field of machining cutters, particularly relates to a tungsten steel milling cutter with an inner cooling structure, and aims to solve the problems that the temperature of a cutting edge of the cutter is sharply increased, the service life of the cutter is shortened and the service life of the cutter is influenced because heat cannot be timely and effectively dissipated when an existing device is used. According to the technical scheme, the tool comprises a tool bar, a tool bit is arranged at one end of the tool bar, and an axial cooling channel is formed in the tool bar; the tool bit has the advantages that the axial cooling channel and the radial cooling channel are designed, cooling liquid can directly reach the cutting edge of the tool bit, compared with traditional external spraying cooling, the cooling efficiency is remarkably improved, the temperature of a tool and a workpiece is rapidly lowered, the machining problem caused by high temperature is reduced, thermal deformation of the tool and the workpiece is effectively reduced through the good cooling effect, and the service life of the tool bit is prolonged. The shape precision of the cutting edge of the cutter is ensured, the machining precision and the surface quality are improved, and the high-precision machining requirement is met.

Description

Technical Field

[0001] This utility model relates to a tungsten carbide end mill, specifically a tungsten carbide end mill with an internal cooling structure, belonging to the field of machining tool technology. Background Technology

[0002] In the field of machining, milling cutters are commonly used cutting tools, and tungsten carbide milling cutters are widely used due to their high hardness and good wear resistance. During the milling process, a large amount of heat is generated between the tool and the workpiece. If heat cannot be dissipated in a timely and effective manner, it will lead to accelerated tool wear, reduced machining accuracy, and even damage to the tool and the workpiece.

[0003] In the prior art, such as the tungsten carbide end mill disclosed in announcement number CN104057131A, the tungsten carbide end mill has high structural strength, and the four corners serve as milling edges, effectively machining the workpiece during continuous rotation. However, the above-mentioned prior art has the following shortcomings: In tungsten carbide end mills, due to the cutting deformation of the metal material and the friction between the tool and the workpiece, a large amount of cutting heat is generated. If this heat cannot be dissipated in a timely and effective manner, the temperature of the cutting edge of the tool will rise sharply. The excessively high temperature will accelerate the wear of the tool material and reduce the tool's service life. On the other hand, it will also reduce the surface quality of the machined workpiece, such as increasing surface roughness and deteriorating workpiece dimensional accuracy. Utility Model Content

[0004] The purpose of this invention is to provide a tungsten carbide end mill with an internal cooling structure to solve the problems that the above-mentioned devices cannot dissipate heat in a timely and effective manner during use, which will cause the cutting edge temperature of the tool to rise sharply, reduce the service life of the tool, and reduce the surface quality of the machined workpiece.

[0005] This utility model achieves the above-mentioned objective through the following technical solution: a tungsten carbide end mill with an internal cooling structure, including a cutter shank;

[0006] The tool holder has a tool head at one end. An axial cooling channel is provided inside the tool holder, and a radial cooling channel is provided inside the tool head. The radial cooling channels are connected to the axial cooling channels, and the outlet of the radial cooling channels is located near the cutting edge of the tool head.

[0007] As a further improvement of this utility model: the tool holder has multiple external cooling channels inside, which are connected to the axial cooling channels, and the outlets of the multiple external cooling channels are located directly above the cutting edge of the tool head.

[0008] As a further improvement of this invention, the diameter of the axial cooling channel gradually decreases from the tail of the tool holder to the tool head.

[0009] As a further improvement of this invention, the radial cooling channels are multiple and evenly distributed along the circumference of the cutter head.

[0010] As a further improvement of this utility model: a control sleeve is provided on the outer side of the tool holder, and multiple connecting holes are opened on the surface of the control sleeve. The number of connecting holes is consistent with the number of external cooling channels and corresponds one-to-one. A slip ring is integrally formed inside one end of the control sleeve, and an annular groove adapted to the slip ring is opened on the surface of the tool head. The control sleeve is rotatably connected to the outer side of the tool holder through the slip ring and the annular groove.

[0011] As a further improvement of this invention, a sealing gasket is installed on the surface of the tool holder and at the outlet of the external cooling channel.

[0012] As a further improvement of this utility model, a nozzle is installed at the bottom of the control sleeve and at the outlet of the connecting hole.

[0013] As a further improvement of this utility model: the surface of the cutter head is provided with multiple grooves, and the outlet of the radial cooling channel is connected to the grooves.

[0014] The beneficial effects of this utility model are:

[0015] This invention utilizes a combination of structures including axial cooling channels, radial cooling channels, a control sleeve, a nozzle, a connecting hole, an external cooling channel, and a groove. The axial and radial cooling channel design allows the coolant to directly reach the cutting edge of the tool. Compared with traditional external spray cooling, this significantly improves cooling efficiency, rapidly reduces the temperature of the tool and workpiece, and minimizes machining problems caused by high temperatures. The excellent cooling effect effectively reduces thermal deformation of the tool and workpiece, ensuring the shape accuracy of the tool's cutting edge, thereby improving machining accuracy and surface quality, and meeting the requirements of high-precision machining.

[0016] The axial cooling channel diameter gradually changes, accelerating the coolant flow rate. Combined with multiple radial cooling channels evenly distributed around the circumference of the tool head, the coolant is sprayed evenly across all parts of the tool head, comprehensively covering the cutting area. This ensures a consistent temperature around the circumference of the tool head, preventing localized overheating. The coolant is sprayed from the grooves on the cutting edge, directly cooling and lubricating the cutting edge, reducing tool wear. The uniform cooling also makes the tool head wear more even, reducing tool change frequency and saving machining costs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the radial cooling channel and the axial cooling channel in this utility model;

[0019] Figure 3This is a cross-sectional schematic diagram of the control sleeve, slip ring, and external cooling channel in this utility model;

[0020] Figure 4 This is a schematic diagram of the sealing gasket structure in this utility model;

[0021] Figure 5 In this utility model Figure 2 Enlarged schematic diagram of the structure at point A in the diagram;

[0022] In the diagram: 1. Tool holder; 2. Tool head; 3. Axial cooling channel; 4. Radial cooling channel; 5. Control sleeve; 6. Nozzle; 7. Connecting hole; 8. Slip ring; 9. Annular groove; 10. External cooling channel; 11. Sealing gasket; 12. Groove. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example 1

[0024] like Figures 1 to 5 As shown, a tungsten carbide end mill with an internal cooling structure includes a tool holder 1;

[0025] The tool holder 1 is provided with a tool head 2 at one end. An axial cooling channel 3 is provided inside the tool holder 1. A radial cooling channel 4 is also provided inside the tool head 2. The radial cooling channels 4 are all connected to the axial cooling channels 3. The outlet of the radial cooling channels 4 is located near the cutting edge of the tool head 2.

[0026] Multiple radial cooling channels 4 inside the cutter head 2 are connected to the axial cooling channels 3 and are evenly distributed in the circumferential direction of the cutter head 2. This ensures that all parts of the cutter head 2 can be adequately cooled, avoids local overheating of the cutter head 2, ensures the temperature uniformity of the cutter head 2 in the entire circumferential direction, makes the tool wear more uniform, and thus improves the machining accuracy.

[0027] Furthermore, the tool holder 1 has multiple external cooling channels 10 inside, which are connected to the axial cooling channel 3. The outlets of the multiple external cooling channels 10 are located directly above the cutting edge of the tool head 2.

[0028] The external cooling channel 10 is connected to the axial cooling channel 3, which can supply additional coolant to the cutting area. Together with the radial cooling channel 4, it cools the cutting edge of the tool head 2 from multiple directions, forming a three-dimensional cooling system. This significantly enhances the cooling capacity, reduces the temperature of the cutting area more efficiently, and prevents the tool from failing due to overheating. At the same time, the outlet of the external cooling channel 10 is located directly above the cutting edge of the tool head 2, so the coolant can be directly sprayed onto the most critical working part of the cutting edge. This can stabilize the temperature of the cutting area, reduce the impact of temperature fluctuations on the material properties of the workpiece, make the cutting process smoother, reduce vibration and noise during the machining process, and further improve machining accuracy and efficiency.

[0029] Furthermore, the diameter of the axial cooling channel 3 gradually decreases from the tail of the tool holder 1 to the tool head 2.

[0030] As the diameter of the axial cooling channel 3 gradually decreases from the tail of the tool holder 1 to the tool head 2, the flow rate of the coolant in the channel will increase, allowing it to reach the cutting area of ​​the tool head 2 more quickly, thus improving the timeliness of cooling. This will more efficiently reduce the temperature of the tool head 2 and the workpiece, reduce problems such as tool wear and workpiece deformation caused by high temperature, and improve machining accuracy and surface quality.

[0031] Furthermore, there are multiple radial cooling channels 4, which are evenly distributed along the circumference of the cutter head 2.

[0032] A radial cooling channel 4 is evenly distributed in the circumference of the cutter head 2, which can cover the cutting area of ​​the cutter head 2 in all directions, so that the coolant is evenly sprayed in all parts of the cutter head 2, ensuring that the temperature of the cutter head 2 is consistent in the circumference direction, avoiding local overheating. Uniform cooling can prevent the cutter head 2 from thermal deformation due to local overheating, ensuring the shape accuracy of the cutting edge of the tool, and thus improving the machining accuracy. Example 2

[0033] Improvements based on Example 1:

[0034] Furthermore, a control sleeve 5 is provided on the outer side of the tool holder 1. The surface of the control sleeve 5 has multiple connecting holes 7. The number of connecting holes 7 is the same as the number of external cooling channels 10 and they correspond one-to-one. A slip ring 8 is integrally formed inside one end of the control sleeve 5. The surface of the tool head 2 has an annular groove 9 that matches the slip ring 8. The control sleeve 5 is rotatably connected to the outer side of the tool holder 1 through the slip ring 8 and the annular groove 9.

[0035] The control sleeve 5 can rotate around the tool holder 1. During the rotation, the relative position of the connecting hole 7 and the external cooling channel 10 changes, thereby controlling the flow rate of the coolant.

[0036] Furthermore, a sealing gasket 11 is installed on the surface of the tool holder 1 and at the outlet of the external cooling channel 10.

[0037] The sealing gasket 11 can effectively fill the tiny gaps between the tool holder 1 and the control sleeve 5, preventing coolant from seeping out of these gaps and ensuring that the coolant is accurately sprayed from the outlet of the connecting hole 7 onto the cutting edge of the tool head 2 according to the design path, so as to ensure that the cooling effect is not affected.

[0038] Furthermore, a nozzle 6 is installed at the bottom of the control sleeve 5 and at the outlet of the connecting hole 7.

[0039] The nozzle 6 can optimize the spraying of coolant, so that the coolant is sprayed out at a specific angle. Compared with the coolant flowing out directly from the connecting hole 7, the nozzle 6 can spray the coolant more concentratedly and evenly to the cutting edge of the tool head 2, thereby enhancing the cooling and lubrication effect and improving the machining accuracy and surface quality.

[0040] Furthermore, the surface of the cutter head 2 is provided with multiple grooves 12, and the outlet of the radial cooling channel 4 is connected to the grooves 12.

[0041] The groove 12 increases the contact area between the coolant and the cutting edge of the tool head 2 and the machining area, allowing the coolant to absorb the heat generated during the cutting process more fully. The outlet of the radial cooling channel 4 is connected to the groove 12. When the coolant is sprayed out from the groove 12, it can cover the cutting edge more comprehensively, quickly remove heat, effectively reduce the temperature of the tool head 2 and the workpiece, reduce thermal deformation, and improve machining accuracy and surface quality.

[0042] Working principle: During use, in the milling process, the coolant is delivered to the inlet of the axial cooling channel 3 at the tail of the tool holder 1 through external equipment. As the diameter of the axial cooling channel 3 gradually decreases, the flow rate of the coolant increases, improving the cooling effect. It then enters the radial cooling channel 4 and the external cooling channel 10 connected to the axial cooling channel 3, and is finally sprayed onto the cutting edge to cool and lubricate the cutting area.

[0043] In the radial cooling channel 4, coolant is sprayed from the outlet near the cutting edge of the tool head 2 through the groove 12 to directly cool and lubricate the cutting edge. At the same time, in the external cooling channel 10, coolant is sprayed from directly above the cutting edge of the tool head 2 through the connecting hole 7 and the nozzle 6 on the control sleeve 5 to further enhance the cooling effect. By rotating the control sleeve 5, the flow rate of coolant sprayed from the nozzle 6 can be adjusted to adapt to different processing requirements.

[0044] A nozzle 6 is installed at the bottom of the control sleeve 5 and at the outlet of the connecting hole 7, so that the coolant can be sprayed more accurately onto the cutting area. A sealing gasket 11 is installed on the surface of the tool holder 1 and at the outlet of the external cooling channel 10 to prevent coolant leakage.

[0045] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0046] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A tungsten steel milling cutter with internal cooling structure comprising a cutter bar (1); characterized in that: The cutter bar (1) is provided with a cutter head (2) at one end; The tool holder (1) has an axial cooling channel (3) inside, and the tool head (2) also has a radial cooling channel (4) inside. The radial cooling channels (4) are connected to the axial cooling channels (3), and the outlet of the radial cooling channels (4) is located near the cutting edge of the tool head (2).

2. The tungsten steel milling cutter having an internal cooling structure according to claim 1, characterized in that: The tool holder (1) has multiple external cooling channels (10) inside, which are connected to the axial cooling channel (3). The outlets of the multiple external cooling channels (10) are located directly above the cutting edge of the tool head (2).

3. The tungsten steel milling cutter having an internal cooling structure according to claim 1, characterized in that: The diameter of the axial cooling channel (3) gradually decreases from the tail of the tool holder (1) to the tool head (2).

4. The tungsten steel milling cutter having an internal cooling structure according to claim 1, characterized by: The radial cooling channels (4) are numerous and are evenly distributed along the circumference of the cutter head (2).

5. The tungsten steel milling cutter having an internal cooling structure according to claim 1, characterized by: A control sleeve (5) is provided on the outside of the tool holder (1). The surface of the control sleeve (5) is provided with multiple connecting holes (7). The number of connecting holes (7) is the same as the number of external cooling channels (10) and they correspond one to one. A slip ring (8) is integrally formed inside one end of the control sleeve (5). The surface of the tool head (2) is provided with an annular groove (9) that matches the slip ring (8). The control sleeve (5) is rotatably connected to the outside of the tool holder (1) through the slip ring (8) and the annular groove (9).

6. The tungsten steel milling cutter having an internal cooling structure according to claim 1, characterized by: A sealing gasket (11) is installed on the surface of the tool holder (1) and at the outlet of the external cooling channel (10).

7. The tungsten steel milling cutter having an internal cooling structure according to claim 5, characterized in that: A nozzle (6) is installed at the bottom of the control sleeve (5) and at the outlet of the connecting hole (7).

8. The tungsten steel milling cutter having an internal cooling structure according to claim 1, characterized by: The surface of the cutter head (2) is provided with multiple grooves (12), and the outlet of the radial cooling channel (4) is connected to the grooves (12).

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