An internally cooled double-walled end mill assembly

Abstract

This invention belongs to the field of end mill technology, specifically disclosing an internally cooled double-walled end mill assembly. Addressing the technical shortcomings of existing internally cooled end mills, such as uneven cooling, unadjustable flow rate, easy clogging of flow channels, and high heat conduction loss, the invention optimizes the structural design. The end mill assembly includes an end mill head, a clamping block, an end mill disc, a quick-release head, an inner pad, and a cooling channel. The quick-release head is fixed to the end mill disc. The clamping block, in conjunction with the inner pad, clamps and positions the end mill head while simultaneously blocking heat conduction. A through cooling channel is formed between the quick-release head and the end mill disc. The end mill disc has a built-in cooling pipe, with a flow rod and flow spring inside to form a hydraulic flow control structure, which, combined with the centrifugal force of cutting, assists in regulating the coolant flow rate. Near the end mill head, the cooling channel is divided into a first and a second cooling chamber, forming an independent double-walled internal cooling flow path. The inner pad has a tapered tube and internal cooling holes, and the quick-release head has staggered external cooling holes. Both the internal and external cooling holes adopt a variable diameter structure with a coarser inlet and a smaller outlet.

Description

Technical Field

[0001] This invention belongs to the field of milling cutter technology, specifically an internally cooled double-walled milling cutter assembly. Background Technology

[0002] Milling is a core cutting process in the mechanical manufacturing industry. High-speed, precision milling of difficult-to-machine materials such as high-temperature alloys and stainless steel relies heavily on internally cooled end mills. Internally cooled end mills are specialized tools that utilize cooling channels within the cutter body to directly deliver coolant to the working area of ​​the cutting edge. Compared to traditional external cooling methods, this directly removes the cutting heat source, alleviating tool overheating and wear, and is the mainstream solution for improving the cutting efficiency of difficult-to-machine materials.

[0003] Currently, most conventional internal cooling end mills adopt a single-wall, single-straight-hole flow channel structure. The coolant is transported unidirectionally to the cutting position through the tool holder and cutter head flow channels, which can only achieve local fixed-point spray cooling. The industry is also gradually developing internal cooling end mills with double-wall structures, which rely on double-layer sandwich flow channels to expand the cooling coverage area and try to optimize the overall heat dissipation effect.

[0004] Although this type of double-wall internal cooling end mill has overcome the limitations of single-channel cooling, there is still room for optimization in the detailed design of channel layout, flow rate adaptation, and structural connection. The working condition adaptability and heat dissipation uniformity of the cooling channel need to be improved, and the detailed design of cutting heat conduction barrier and channel anti-blocking has not been perfected, making it difficult to maximize the heat dissipation advantages of double-wall internal cooling.

[0005] In view of this, the present invention proposes an internally cooled double-walled end mill assembly, which solves the above-mentioned technical problems. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides an internally cooled double-walled end mill assembly; and optimizes the relevant structural design to address the technical defects of existing internally cooled end mills, such as uneven cooling, unadjustable flow rate, easy clogging of flow channels, and large heat conduction loss.

[0007] The technical solution adopted by the present invention to solve its technical problem is an internally cooled double-walled end mill assembly, including an end mill head, which is fixedly installed on the end mill disc by a clamping block. In addition, it also includes a quick-release head, an inner pad, and a cooling channel.

[0008] The quick-release head is fixedly installed on the milling cutter disc to fix the milling cutter head. The clamping block is fixedly installed on the quick-release head by bolts and the clamping block abuts against the milling cutter head. The inner pad is fixedly installed on one side of the quick-release head to abut the milling cutter head; The quick-release head and the milling cutter disc have interconnected cooling channels at their contact surfaces.

[0009] Preferably, one end of the inner pad is a tubular cylindrical structure that engages with the cooling channel at the bottom of the quick-release head, and the other end of the inner pad is a partially hollow cylindrical tube with its open end abutting against the side wall of the milling cutter head.

[0010] Preferably, a machine tool docking shaft is fixedly installed in the middle of the milling cutter head, and a cooling pipe is installed through the middle of the milling cutter head. One end of the cooling pipe is arranged in close contact with the docking shaft, and the other end of the cooling pipe is inserted into the cooling channel inside the quick-release head.

[0011] Preferably, a flow rod is slidably installed at the end of the cooling pipe, the outer wall of the flow rod is slidably sealed with the inner cavity of the cooling pipe, one end of the flow rod protrudes from the quick-release head, and a flow spring is connected between this end of the flow rod and the end of the cooling pipe. The diameter of the other end of the flow rod is reduced, and a gap is reserved between it and the inner wall of the cooling pipe. A leakage groove connected to the cooling channel is opened on the side of the cooling pipe facing the quick-release head.

[0012] Preferably, the cooling channel inside the quick-release head is divided into a first cooling chamber and a second cooling chamber near the end mill head, forming a double-walled internal cooling flow path. The first cooling chamber is connected to the tubular cylindrical structure of the inner pad, and the second cooling chamber extends to a position obliquely above the working area of ​​the end mill head.

[0013] Preferably, the milling cutter head has a through hole in the middle, and the hollow round tube of the inner pad has a tapered tube extending towards the through hole in the center of the milling cutter head in the middle, and the inner pad has several internal cooling holes facing the working area of ​​the milling cutter head.

[0014] Preferably, the quick-release head has several external cooling holes located above the milling cutter head, and the external cooling holes are connected to the second cooling chamber.

[0015] Preferably, the inner cooling hole and the outer cooling hole are staggered, with the inner cooling hole acting on the planar sidewall of the milling cutter head and the outer cooling hole acting on the arc sidewall of the milling cutter head. Both the inner cooling hole and the outer cooling hole adopt a variable diameter structure with a coarse inlet and a fine outlet.

[0016] The beneficial effects of the present invention are as follows: The inner pad designed in this invention has both clamping and positioning functions as well as heat insulation functions. Through the double-walled double-cavity diversion cooling combined with the inner and outer staggered cold holes, it can achieve heat dissipation in the cutting area while improving the cooling uniformity. The coolant flow relies on the dual adaptive flow adjustment structure of hydraulic and centrifugal forces, which can accurately match different speed conditions and improve cooling efficiency. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a schematic diagram of the overall connection structure from a first-view perspective of the present invention; Figure 2 This is a schematic diagram of the overall connection structure from a second perspective of the present invention; Figure 3 This is a schematic diagram of the cooling pipe installation method; Figure 4 for Figure 3 Enlarged diagram of point A in the diagram; Figure 5 This is a schematic diagram showing the positional relationship between the milling cutter head and the inner pad; In the picture: 1. Milling cutter head; 2. Clamping block; 3. Milling cutter disc; 4. Quick release head; 5. Inner gasket; 6. Cooling channel; 7. Connecting shaft; 31. Cooling pipe; 32. Flow rod; 33. Flow spring; 311. Leakage groove; 61. First cooling chamber; 62. Second cooling chamber; 51. Tapered tube; 52. Inner cooling hole; 41. Outer cooling hole. Detailed Implementation

[0019] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0020] See Figures 1 to 5 As shown, a preferred embodiment of the present invention provides an internally cooled double-walled milling cutter assembly, including a milling cutter head 1, which is fixedly mounted on a milling cutter disc 3 by a clamping block 2. In addition, it also includes a quick-release head 4, an inner pad 5, and a cooling channel 6.

[0021] The quick-release head 4 is fixedly installed on the milling cutter disc 3 to fix the milling cutter head 1. The clamping block 2 is fixedly installed on the quick-release head 4 by bolts, and the clamping block 2 abuts against the milling cutter head 1. The inner pad 5 is fixedly installed on one side of the quick-release head 4 to abut against the milling cutter head 1; The quick-release head 4 and the milling cutter disc 3 have interconnected cooling channels 6 at their contact surfaces. The milling cutter head 3 is fixedly provided with a machine tool docking shaft 7 in the middle. A cooling pipe 31 is installed through the middle of the milling cutter head 3. One end of the cooling pipe 31 is arranged in close contact with the docking shaft 7, and the other end of the cooling pipe 31 is inserted into the cooling channel 6 inside the quick release head 4. The cooling pipe 31 realizes the introduction of coolant.

[0022] During installation, the milling cutter head 1 is clamped by the clamping block 2 and the inner pad 5, while simultaneously isolating the heat transfer of the milling cutter head 1.

[0023] For further details, please refer to [link / reference]. Figure 3 and Figure 5As shown, one end of the inner pad 5 is a tubular cylindrical structure that engages with the cooling channel 6 at the bottom of the quick-release head 4. The other end of the inner pad 5 is a partially hollow cylindrical tube, with its open end abutting against the side wall of the milling cutter head 1. The hollow cylindrical tube has a planar structure near the cutting edge working area of ​​the milling cutter head 1 to avoid obstructing the working area. Simultaneously, when coolant flows in from the front cooling channel 6, it immediately enters the internal cavity of the inner pad 5 and briefly resides there. At this time, because the open end of the inner pad 5 is in contact with the side wall of the milling cutter head 1, the coolant absorbs the heat from the milling cutter head 1 upon entering.

[0024] For further details, please refer to [link / reference]. Figure 3 and Figure 4 As shown, a flow rod 32 is slidably installed at the end of the cooling pipe 31. The outer wall of the flow rod 32 is slidably sealed with the inner cavity of the cooling pipe 31. One end of the flow rod 32 protrudes from the quick-release head 4, and a flow spring 33 is connected between this end of the flow rod 32 and the end of the cooling pipe 31. The diameter of the other end of the flow rod 32 is reduced, and a gap is reserved between it and the inner wall of the cooling pipe 31. A leakage groove 311 connected to the cooling channel 6 is opened on the side of the cooling pipe 31 facing the quick-release head 4.

[0025] During operation, when coolant is introduced into the cooling pipe 31, the flow rod 32 is squeezed and slides within the cooling pipe 31 under the high pressure of the coolant. At this time, the flow spring 33 is compressed and deformed, and the leakage groove 311 gradually opens. The coolant in the cooling pipe 31 flows into the cooling channel 6 inside the quick-release head 4 from the leakage groove 311, thereby cooling the milling cutter head 1. The coolant flow rate can be actively adjusted by its hydraulic pressure. At the same time, with the rotation of the milling cutter disc 3 during the milling process, the centrifugal force provided by the change in its rotation speed can help adjust the exposed extension length of the flow rod 32, further adjusting the coolant flow rate.

[0026] For further details, please refer to [link / reference]. Figure 3 and Figure 4 As shown, the cooling channel 6 inside the quick-release head 4 splits into a first cooling chamber 61 and a second cooling chamber 62 near the end mill head 1, forming a double-walled internal cooling flow path. The first cooling chamber 61 is connected to the tubular cylindrical structure of the inner pad 5, and the second cooling chamber 62 extends to a position obliquely above the working area of ​​the end mill head 1. Through the dual cooling channels, they do not interfere with each other, increasing the cooling area.

[0027] For further details, please refer to [link / reference]. Figure 5 As shown, the milling cutter head 1 has a through hole in the middle, and the hollow round tube of the inner pad 5 has a tapered tube 51 extending towards the central through hole of the milling cutter head 1 in the middle. The inner pad 5 has several internal cooling holes 52 facing the working area of ​​the milling cutter head 1. Through the tapered tube 51, the flow of coolant can be concentrated, so that during the initial spraying process, it can concentrate the impact on the central through hole area of ​​the milling cutter head 1, thereby improving the heat carrying effect of the milling cutter head 1.

[0028] For further details, please refer to [link / reference]. Figure 4 and Figure 5 As shown, the quick-release head 4 has several external cooling holes 41 located above the milling cutter head 1. The external cooling holes 41 are connected to the second cooling chamber 62. The internal cooling holes 52 are staggered with the external cooling holes 41. The internal cooling holes 52 act on the planar sidewall of the milling cutter head 1, and the external cooling holes 41 act on the arc sidewall of the milling cutter head 1. This achieves sufficient heat dissipation of the milling cutter head 1 from both internal and external directions. The internal and external coolant flow directions do not interfere with each other, reducing splashing. Both the internal cooling holes 52 and the external cooling holes 41 adopt a variable diameter structure with a coarse inlet and a fine outlet to prevent debris from splashing and clogging the outlet. At the same time, it increases the outlet pressure of the coolant, achieving the dual effects of chip removal and heat dissipation.

[0029] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An internally cooled double-walled end mill assembly, comprising an end mill head (1), characterized in that, The milling cutter head (1) is fixedly mounted on the milling cutter disc (3) by a clamping block (2), and also includes: Quick-release head (4), which is fixedly installed on the milling cutter disc (3) for fixing the milling cutter head (1), and clamping block (2) is fixedly installed on the quick-release head (4) by bolts, and clamping block (2) abuts against the milling cutter head (1). Inner pad (5), the inner pad (5) is fixedly installed on one side of the quick release head (4) and is used to abut against the milling cutter head (1). Cooling channel (6): The quick release head (4) and the milling cutter head (3) are connected by a cooling channel (6). The cooling channel (6) in the quick release head (4) is divided into a first cooling chamber (61) and a second cooling chamber (62) when it is close to the milling cutter head (1), forming a double-walled internal cold flow path. The first cooling chamber (61) is connected to the tubular cylindrical structure of the inner pad (5), and the second cooling chamber (62) extends to the position obliquely above the working area of ​​the milling cutter head (1).

2. The internally cooled double-walled end mill assembly according to claim 1, characterized in that: One end of the inner pad (5) is a tubular cylindrical structure that engages with the cooling channel (6) at the bottom of the quick-release head (4). The other end of the inner pad (5) is an incompletely hollow cylindrical tube with its open end abutting against the side wall of the milling cutter head (1).

3. The internally cooled double-walled end mill assembly according to claim 1, characterized in that: The milling cutter disc (3) is fixedly provided with a machine tool docking shaft (7) in the middle. A cooling pipe (31) is installed through the middle of the milling cutter disc (3). One end of the cooling pipe (31) is attached to the docking shaft (7) and the other end of the cooling pipe (31) is inserted into the cooling channel (6) inside the quick release head (4).

4. The internally cooled double-walled end mill assembly according to claim 3, characterized in that: A flow rod (32) is slidably installed at the end of the cooling pipe (31). The outer wall of the flow rod (32) is slidably sealed with the inner cavity of the cooling pipe (31). One end of the flow rod (32) protrudes from the quick-release head (4), and a flow spring (33) is connected between this end of the flow rod (32) and the end of the cooling pipe (31). The diameter of the other end of the flow rod (32) is reduced, and a gap is reserved between it and the inner wall of the cooling pipe (31). A leakage groove (311) connected to the cooling channel (6) is opened on the side of the cooling pipe (31) facing the quick-release head (4).

5. The internally cooled double-walled end mill assembly according to claim 1, characterized in that: The milling cutter head (1) has a through hole in the middle, and the hollow round tube of the inner pad (5) has a tapered tube (51) extending towards the central through hole of the milling cutter head (1) in the middle. The inner pad (5) has several internal cooling holes (52) facing the working area of ​​the milling cutter head (1).

6. The internally cooled double-walled end mill assembly according to claim 1, characterized in that: The quick-release head (4) has several external cooling holes (41) located above the milling cutter head (1), and the external cooling holes (41) are connected to the second cooling chamber (62).

7. The internally cooled double-walled end mill assembly according to claim 6, characterized in that: The internal cooling hole (52) and the external cooling hole (41) are offset from each other. The internal cooling hole (52) acts on the planar side wall of the milling cutter head (1), and the external cooling hole (41) acts on the arc side wall of the milling cutter head (1). Both the internal cooling hole (52) and the external cooling hole (41) adopt a variable diameter structure with a coarse inlet and a fine outlet.

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