Tool head for a numerical control machine tool

Abstract

This utility model provides a cutting tool for CNC machine tools, relating to the field of cutting tool technology. It includes a cooling pipe for fixing to the CNC machine tool, and a tool holder for clamping and fixing to the drilling clamping part of the CNC machine tool. The cooling pipe is sleeved outside the tool holder, and a cooling cavity is formed between the cooling pipe and the tool holder support. When the tool holder overheats, the coolant inside the cooling cavity cools it down. The purpose of this technical solution is that when the CNC machine tool drives the tool holder to rotate for drilling, the resulting cutting heat raises the tool holder temperature. At this time, the continuously circulating coolant in the cooling cavity absorbs and carries away a large amount of heat through heat exchange between the cooling pipe and the high-temperature tool holder, effectively reducing the tool holder temperature. Simultaneously, the structural design of the cooling pipe ensures both rigid support for the tool holder and achieves uniform and efficient heat dissipation, thereby preventing tool wear and deformation caused by heat accumulation and ensuring drilling accuracy and tool life.

Description

Technical Field

[0001] This utility model relates to the field of cutting tool technology, and in particular to a cutting tool for CNC machine tools. Background Technology

[0002] CNC machine tool cutting heads are core components for precision machining. They are made of materials such as superhard alloys, ceramics, cubic boron nitride (CBN), and diamond, possessing extremely high hardness, wear resistance, and thermal stability. Precisely controlled by a CNC system, they can efficiently complete turning, milling, drilling, and boring operations, and are suitable for machining various metals, composite materials, and difficult-to-cut materials. When small CNC machine tools are performing drilling operations, due to their compact structure and the fact that they are usually not equipped with a built-in cooling system, the drill bit generates a lot of cutting heat during high-speed rotation and intense friction with the workpiece material. The heat cannot be conducted and dissipated in a timely and effective manner, thus accumulating rapidly in the narrow area of ​​the cutting tip. This causes the temperature of the cutting edge of the drill bit to rise sharply and soften during annealing, which in turn causes its hardness and wear resistance to drop drastically. This not only leads to premature wear, chipping, or even breakage of the drill bit, resulting in a decrease in machining accuracy, but also affects the accuracy of the machine tool spindle due to high-temperature thermal stress, significantly shortening the tool life and increasing production costs. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of existing technologies.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a CNC machine tool cutting head, including a cooling pipe for fixing on the CNC machine tool, and a cutting shank for clamping and fixing on the drilling clamping part of the CNC machine tool; the cooling pipe is sleeved on the outside of the cutting shank, and the cooling pipe and the cutting shank support are formed with a cooling cavity, and the cutting shank is cooled by the coolant inside the cooling cavity when it overheats.

[0005] In at least some embodiments, the cooling chamber is used to connect to the circulation system of the CNC machine tool, so as to realize the circulation and heat transfer of the coolant within the cooling chamber.

[0006] In at least some embodiments, the upper part of the cooling pipe is integrally formed with a water inlet seat, and the lower part of the cooling pipe is integrally formed with a water outlet seat. The water inlet seat communicates with the water outlet seat through the cooling cavity. The water inlet seat and the water outlet seat are respectively used to connect to a coolant source to realize the liquid supply and liquid recovery actions.

[0007] In at least some embodiments, the tool holder includes a connecting rod located inside the cooling chamber. The connecting rod has a plurality of helical blades integrally formed in a circumferential array. When the connecting rod rotates, it drives the helical blades to rotate and realizes a pump-free guided liquid transfer action.

[0008] In at least some embodiments, a clamping rod is fixedly connected to the upper part of the connecting rod, the clamping rod being used to clamp and fix the drilling clamping part of the CNC machine tool, and a drill rod is fixedly connected to the lower part of the connecting rod, the drill rod being controlled by the CNC machine tool to perform a controllable drilling action.

[0009] In at least some embodiments, a support arm is fixedly connected to the outside of the cooling pipe, and a support plate is fixedly connected to the upper part of the support arm. The support plate is used to connect with the moving part of the CNC machine tool.

[0010] Compared with the prior art, the advantages and positive effects of this utility model are as follows: In this invention, when a CNC machine tool drives the tool holder to rotate for drilling, the resulting cutting heat will cause the tool holder temperature to rise. At this time, the coolant, such as cutting fluid or oil, which is continuously circulating in the cooling chamber, absorbs and carries away a large amount of heat through heat exchange between the cooling pipe and the high-temperature tool holder, effectively reducing the temperature of the tool holder. At the same time, the structural design of the cooling pipe ensures both the rigid support of the tool holder and achieves uniform and efficient heat dissipation, thereby curbing tool wear and deformation caused by heat accumulation and ensuring drilling accuracy and tool life. Attached Figure Description

[0011] Figure 1 This utility model provides a three-dimensional structural schematic diagram of a tool head for CNC machine tools; Figure 2 This utility model provides a three-dimensional structural diagram of an overall exploded structure of a tool head for CNC machine tools; Figure 3 This utility model provides a three-dimensional structural schematic diagram of the cross-section of the cooling pipe in a CNC machine tool tool head; Figure 4 This utility model proposes a tool head for CNC machine tools. Figure 3 A three-dimensional structural diagram of point A in the middle.

[0012] Legend: 1. Cooling pipe; 2. Tool holder; 3. Cooling chamber; 4. Water inlet seat; 5. Water outlet seat; 6. Support arm; 7. Support plate; 101. Clamping rod; 102. Drill rod; 103. Connecting rod; 104. Helical blade. Detailed Implementation

[0013] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0014] 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. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0015] Implementation examples, based on Figures 1-4 As shown in the figure, the present invention provides a CNC machine tool cutting head, including a cooling pipe 1 for fixing on the CNC machine tool, and a cutting bar 2 for clamping and fixing the drilling clamping part of the CNC machine tool; the cooling pipe 1 is sleeved on the outside of the cutting bar 2, and the cooling pipe 1 and the cutting bar 2 support are formed with a cooling cavity 3, and the cutting bar 2 is cooled by the coolant inside the cooling cavity 3 when it is overheated.

[0016] When the CNC machine tool drives the tool holder 2 to rotate for drilling, the resulting cutting heat will cause the temperature of the tool holder 2 to rise. At this time, the coolant, such as cutting fluid or oil, which is continuously circulating in the cooling chamber 3, absorbs and carries away a large amount of heat through heat exchange between the cooling pipe 1 and the high-temperature tool holder 2, effectively reducing the temperature of the tool holder 2. At the same time, the structural design of the cooling pipe 1 not only ensures the rigid support of the tool holder 2, but also achieves uniform and efficient heat dissipation, thereby curbing tool wear and deformation caused by heat accumulation and ensuring drilling accuracy and tool life.

[0017] In this embodiment, the cooling chamber 3 is used to connect to the circulation system of the CNC machine tool, realizing the circulation and heat transfer of coolant within the cooling chamber 3. The upper part of the cooling pipe 1 is integrally formed with a water inlet seat 4, and the lower part of the cooling pipe 1 is integrally formed with a water outlet seat 5. The water inlet seat 4 is connected to the water outlet seat 5 through the cooling chamber 3. The water inlet seat 4 and the water outlet seat 5 are respectively used to connect to the coolant source to realize the liquid supply and liquid recovery actions. The tool holder 2 includes a connecting rod 103, which is located inside the cooling chamber 3. The connecting rod 103 is integrally formed with several spiral blades 104 in a circumferential array. When the connecting rod 103 rotates, it drives the spiral blades 104 to rotate and realize the liquid pump-free guided transfer action. The upper part of the connecting rod 103 is fixedly connected with a clamping rod 101, which is used to clamp and fix the drilling clamping part of the CNC machine tool. The lower part of the connecting rod 103 is fixedly connected with a drill rod 102, which is controlled by the CNC machine tool to perform controllable drilling action.

[0018] During operation, the CNC machine tool spindle drives the clamping rod 101 to rotate, which in turn drives the connecting rod 103 and the lower drill rod 102 fixed thereto to rotate synchronously for drilling. At the same time, the external coolant source continuously supplies coolant to the cooling chamber 3 through the water inlet seat 4, and the coolant filling the chamber directly contacts the high-temperature connecting rod 103 and the spiral blade 104. As the connecting rod 103 rotates at high speed, its circumferential array of integrated spiral blades 104 acts like a miniature turbine, constantly stirring and pushing the coolant forward along the cavity in a spiral motion, achieving pump-free forced circulation and greatly improving heat exchange efficiency. During the flow process, the coolant fully absorbs the cutting heat conducted by the drill rod 102 through the connecting rod 103. The heated liquid is discharged through the water outlet seat 5 to the external system for cooling and filtration, forming a closed loop. This design not only actively cools the machined area through the physically isolated cooling chamber 3, preventing cutting fluid from contaminating the machining zone, but also utilizes the eddies and turbulence generated by the blades to disrupt the thermal boundary layer, significantly enhancing heat transfer. This allows for precise control of the tool holder 2 temperature, suppressing thermal deformation and wear, and ensuring accuracy and tool durability in deep hole machining.

[0019] In this embodiment, a support arm 6 is fixedly connected to the outside of the cooling pipe 1, and a support plate 7 is fixedly connected to the upper part of the support arm 6. The support plate 7 is used to connect with the moving part of the CNC machine tool.

[0020] The support plate 7 is rigidly connected to the moving part of the CNC machine tool, such as the slide table, to ensure that the cooling pipe 1 and its internal circulation system move synchronously and accurately with the tool. The support arm 6 acts as a sturdy bridge, stably suspending the cooling pipe 1 outside the tool holder 2. This not only isolates the transmission of machining vibrations but also ensures the constant relative position of the cooling chamber 3 and the tool holder 2, making the cyclic cooling process continuous and stable, unaffected by the machine tool's feed motion.

[0021] The working principle of this utility model is as follows: When the CNC machine tool drives the tool holder 2 to rotate for drilling, the cutting heat generated will cause the temperature of the tool holder 2 to rise. At this time, the coolant, such as cutting fluid or oil, which is continuously circulating in the cooling chamber 3, absorbs and carries away a large amount of heat through heat exchange between the cooling pipe 1 and the high-temperature tool holder 2, effectively reducing the temperature of the tool holder 2. At the same time, the structural design of the cooling pipe 1 not only ensures the rigid support of the tool holder 2, but also achieves uniform and efficient heat dissipation, thereby curbing tool wear and deformation caused by heat accumulation and ensuring drilling accuracy and tool life.

[0022] The above are merely preferred embodiments of this utility model and are not intended to limit the utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model without departing from the technical solution of this utility model shall still fall within the protection scope of this utility model.

Claims

1. A cutting head for a CNC machine tool, comprising a cooling pipe (1), said cooling pipe (1) being used to fix it on the CNC machine tool, characterized in that, Also includes: Tool holder (2), the tool holder (2) is used to clamp and fix the drilling machine clamping part on the CNC machine tool; The cooling pipe (1) is sleeved on the outside of the tool bar (2). The cooling pipe (1) and the tool bar (2) support are formed with a cooling cavity (3). When the tool bar (2) is overheated, the cooling liquid inside the cooling cavity (3) is used to achieve the cooling action.

2. The tool head for a CNC machine tool according to claim 1, characterized in that: The cooling chamber (3) is used to connect the circulation system of the CNC machine tool to realize the circulation and heat transfer of the coolant in the cooling chamber (3).

3. A tool head for a CNC machine tool according to claim 2, characterized in that: The upper part of the cooling pipe (1) is integrally formed with a water inlet seat (4), and the lower part of the cooling pipe (1) is integrally formed with a water outlet seat (5). The water inlet seat (4) is connected to the water outlet seat (5) through the cooling cavity (3). The water inlet seat (4) and the water outlet seat (5) are respectively used to connect to the coolant source to realize the liquid supply and liquid recovery actions.

4. A tool head for a CNC machine tool according to claim 3, characterized in that: The tool holder (2) includes a connecting rod (103), which is located inside the cooling chamber (3). The connecting rod (103) has a plurality of spiral blades (104) integrally formed in a circumferential array. When the connecting rod (103) rotates, it drives the spiral blades (104) to rotate and realizes the pump-free guided transmission of liquid.

5. A cutting head for a CNC machine tool according to claim 4, characterized in that: A clamping rod (101) is fixedly connected to the upper part of the connecting rod (103). The clamping rod (101) is used to clamp and fix the drilling clamping part of the CNC machine tool. A drill rod (102) is fixedly connected to the lower part of the connecting rod (103). The drill rod (102) is controlled by the CNC machine tool to perform controllable drilling.

6. A tool head for a CNC machine tool according to claim 1, characterized in that: The cooling pipe (1) is fixedly connected to a support arm (6), and a support plate (7) is fixedly connected to the upper part of the support arm (6). The support plate (7) is used to connect with the moving part of the CNC machine tool.

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