A side-vented twist drill heat dissipation structure

Abstract

This utility model relates to the technical field of twist drill heat dissipation structures, providing a side-hole venting type twist drill heat dissipation structure, including a support shank, the outer wall of which is provided with a spiral groove for material discharge. This utility model utilizes the self-locking transmission effect of the worm gear and worm wheel in the venting heat dissipation structure to drive the support shank to rotate smoothly, and also facilitates the addition of a miniature air pump for active ventilation and heat dissipation. The miniature air pump actively delivers gas along the connecting vertical pipe into the spiral-shaped central air channel inside the support shank, causing the airflow to form a spiral flow, increasing the contact area with the air channel wall and enhancing the heat dissipation effect. Furthermore, the matching of the venting side hole with the cutting edge allows the ejected airflow to directly act on the high-temperature cutting zone, quickly removing heat and preventing tool softening and workpiece thermal damage. The airflow is also guided by the air guide channel along the spiral groove for material discharge, achieving a synergistic effect of heat dissipation and chip removal.

Description

Technical Field

[0001] This utility model relates to the technical field of heat dissipation structure for twist drills, and in particular to a side-hole ventilation type heat dissipation structure for twist drills. Background Technology

[0002] Twist drills have a twisted cutting edge and are mainly used to machine cylindrical through holes or blind holes on workpieces. When in use, the spiral grooves of the working part are used for chip removal and cutting fluid delivery, while the cutting edge is responsible for cutting the material. Considering that the high temperature during the cutting process may cause thermal deformation, surface hardening or burning at the drilled part of the workpiece, and that chips may easily stick to the spiral grooves of the drill bit, resulting in poor chip removal, further aggravating friction and heat generation, and causing drill jamming, twist drills often need to be equipped with a heat dissipation structure. To address this, patent CN216151209U discloses a twist drill with a built-in heat dissipation structure, specifically relating to the mechanical field. The drill includes a main body, with a mounting sleeve fitted on the outer surface of one end. A fixed disk is rotatably connected to the outer surface of the mounting sleeve via a bearing. Several exhaust blades are fixedly connected to one side of the outer surface of the fixed disk, and a connecting turntable is provided on the other side of the outer surface of the fixed disk. An air collecting frame ring is rotatably connected to the outer surface of the connecting turntable via a sliding assembly. This twist drill with a built-in heat dissipation structure, by setting the air collecting frame ring, allows the main body to rotate, causing the connecting turntable to rotate and driving the surrounding airflow. The airflow passes through the air inlet slot and is blocked by the air inlet baffle before entering the airflow space slot. Furthermore, the air inlet baffle is pushed by the airflow, and because the air collecting frame ring and the connecting turntable are rotatably connected via a sliding assembly, the high-speed rotation of the twist drill main body may also cause the air collecting frame ring to rotate. While the aforementioned twist drill with its built-in heat dissipation structure can be equipped with an air-collecting frame ring during use, the rotation of the twist drill body drives the connecting turntable to rotate, causing the surrounding airflow. The airflow enters the airflow space slot through the air inlet slot and is blocked by the air inlet baffle. At this time, the air inlet baffle is pushed by the airflow, and since the air-collecting frame ring and the connecting turntable are connected by a sliding component, the high-speed rotation of the twist drill body or the air-collecting frame ring can also cause it to rotate. However, it only dissipates heat through the airflow movement of the exhaust blades and the air-collecting frame ring. It requires high-speed rotation. When the drill bit is drilling at low speed or machining hard materials, the airflow speed is insufficient, and the heat dissipation efficiency drops significantly. Moreover, the airflow can only dissipate heat indirectly through the external spiral groove and cannot directly act on the high-temperature area where the cutting edge contacts the workpiece. Therefore, it is necessary to design a side-hole ventilation type twist drill heat dissipation structure. Utility Model Content

[0003] The purpose of this invention is to provide a side-ventilated twist drill heat dissipation structure to solve the defects of existing twist drill heat dissipation structures, such as unstable heat dissipation effect and inability to simultaneously achieve efficient heat dissipation and chip removal.

[0004] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a side-hole ventilation type twist drill heat dissipation structure, including a support shank; The outer wall of the support handle is provided with a spiral groove for material discharge, and the top of the support handle is provided with a cutting edge. The bottom of the support handle is equipped with a transmission box, and the inside of the transmission box is movably connected with a worm and a worm wheel. The support handle is equipped with a ventilation and heat dissipation structure, which includes a threaded central air passage located in the middle of the inside of the support handle. The bottom of the threaded central air passage is connected to a connecting vertical pipe fixed to the worm gear. The ventilation and heat dissipation structure also includes an outer reinforcing tube that is uniformly fixed to the outer wall of the support handle, and the top end of the outer reinforcing tube is provided with a ventilation side hole that matches the cutting edge, and the outer wall of the outer reinforcing tube is provided with a guide air channel that matches the spiral groove for material discharge and the ventilation side hole.

[0005] Furthermore, both ends of the bottom of the transmission box are provided with mounting feet, and the outer side wall of the transmission box is evenly provided with heat dissipation fins, and the mounting feet are provided with screw holes.

[0006] Furthermore, a miniature air pump is installed at the bottom of the transmission box, and a filter screen is threadedly connected to the input end of the miniature air pump.

[0007] Furthermore, a rotary joint is provided between the output end of the micro air pump and the connecting vertical pipe, and the vertical center lines of the connecting vertical pipe, worm gear, threaded central air passage and support handle are on the same vertical line.

[0008] Furthermore, there are four external reinforcement tubes, which are distributed at equal angles at the top of the support handle. The internal structure of the threaded central air passage, the external reinforcement tubes, and the ventilation side hole are connected.

[0009] Furthermore, a self-lubricating component is installed on the transmission housing, and the self-lubricating component includes a lubricating grease mounting box that is snapped into the top of the transmission housing, and elastic fixing straps are evenly connected to the top of the lubricating grease mounting box.

[0010] Furthermore, the top of the lubricant grease mounting box is uniformly provided with limiting holes, and the inside of the limiting holes is connected to oil-distributing balls that are in contact with the worm gear.

[0011] The present invention provides a side-hole venting type twist drill heat dissipation structure, the advantages of which are: By incorporating a ventilation and heat dissipation structure, the worm gear and worm wheel on the structure create a self-locking transmission effect, which not only drives the support shank to rotate smoothly but also facilitates the addition of a miniature air pump for active ventilation and heat dissipation. The miniature air pump actively delivers gas along the connecting vertical pipe into the spiral central air channel inside the support shank, causing the airflow to form a spiral flow, increasing the contact area with the air channel wall and enhancing the heat dissipation effect. Furthermore, the matching of the ventilation side holes with the cutting edge allows the ejected airflow to directly act on the high-temperature cutting zone, quickly removing heat and preventing tool softening and workpiece thermal damage. The airflow is also guided by the air guide channel to flow along the spiral groove for material discharge, balancing heat dissipation and chip removal to improve overall processing efficiency. Moreover, the four external reinforcement tubes distributed at equal angles not only provide ventilation channels but also enhance the structural strength of the support shank. By incorporating a self-lubricating component, the paste-like lubricant in the lubricant grease box of the self-lubricating component contacts the worm gear through the oil-spreading ball bearings in the limiting hole. The paste-like lubricant in the lubricant grease box is solid or semi-solid. When the worm gear rotates, its tooth surface continuously rolls and rubs against the oil-spreading ball bearings in the limiting hole. The rotation of the oil-spreading ball bearings scrapes off a small amount of paste-like lubricant, evenly transferring it to the worm gear tooth surface to form a lubricating film, thus achieving a lubrication and protection function. Furthermore, the locking structure of the transmission box and the lubricant grease box, as well as the fixing and limiting function of the elastic fixing belt, facilitate the user's replacement of the paste-like lubricant inside the lubricant grease box. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model; Figure 2 This is a three-dimensional cross-sectional structural diagram of the transmission housing of this utility model; Figure 3 This is a three-dimensional structural diagram of the cross-section of the support handle of this utility model; Figure 4 This is a three-dimensional structural diagram of the self-lubricating component of this utility model in a disassembled state. Figure 5 For the present utility model Figure 1 Enlarged structural diagram at point A in the middle.

[0013] The following are the annotations in the diagram: 1. Support handle; 2. Spiral groove for material discharge; 3. Transmission housing; 4. Self-lubricating component; 401. Lubricating grease mounting box; 402. Oil spreading ball bearing; 403. Limiting hole; 404. Elastic fixing band; 5. Miniature air pump; 6. Worm gear; 7. Worm; 8. Mounting foot; 9. Ventilation and heat dissipation structure; 901. Threaded central air passage; 902. External reinforcing tube; 903. Airflow guide passage; 904. Ventilation side hole; 905. Connecting vertical pipe; 10. Cutting edge. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. 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.

[0015] Please see Figures 1-5 The present invention provides a side-hole ventilation type twist drill heat dissipation structure, including a support shank 1.

[0016] Reference Figures 1-5 The outer wall of the support handle 1 is provided with a spiral groove 2 for material discharge, and the top of the support handle 1 is provided with a cutting edge 10. The bottom of the support handle 1 is equipped with a transmission box 3, and the inside of the transmission box 3 is movably connected with a worm gear 7 and a worm wheel 6. A ventilation and heat dissipation structure 9 is installed on the support handle 1, and the ventilation and heat dissipation structure 9 includes a threaded central air passage 901 located in the middle of the inside of the support handle 1, and the bottom of the threaded central air passage 901 is connected to a connecting vertical pipe 905 fixed on the worm gear 6. The ventilation and heat dissipation structure 9 also includes an outer reinforcing tube 902 that is uniformly fixed to the outer wall of the support handle 1, and the top end of the outer reinforcing tube 902 is provided with a ventilation side hole 904 that matches the cutting edge 10. The outer wall of the outer reinforcing tube 902 is provided with a guide air channel 903 that matches the material discharge spiral groove 2 and the ventilation side hole 904. A miniature air pump 5 is installed at the bottom of the transmission box 3, and a filter screen is threadedly connected to the input end of the miniature air pump 5. A rotary joint is provided between the output end of the micro air pump 5 and the connecting vertical pipe 905, and the vertical center lines of the connecting vertical pipe 905, the worm gear 6, the threaded central air passage 901 and the support handle 1 are on the same vertical line. There are four external reinforcement tubes 902, and the external reinforcement tubes 902 are distributed at equal angles on the top of the support handle 1. The internal parts of the threaded central air passage 901, the external reinforcement tubes 902 and the ventilation side hole 904 are connected.

[0017] In use, the self-locking transmission structure formed by the worm 7 and worm wheel 6 drives the support handle 1 to rotate smoothly. The cutting edge 10 at the top of the support handle 1 drills the workpiece, while the spiral groove 2 on its outer wall removes chips. Simultaneously, the micro air pump 5 starts, and external gas, after being filtered by the filter screen at the input end, is delivered to the connecting vertical pipe 905 through the rotary joint at the output end. The rotary joint solves the problem of connecting the rotation of the support handle 1 with the gas delivery, ensuring stable airflow. Then, the gas enters the threaded central air passage 901 inside the support handle 1 along the connecting vertical pipe 905. The air passage 901 creates a spiral flow of air, increasing the contact area with the air passage wall, enhancing heat dissipation, and improving air kinetic energy. This ensures that the gas is accurately delivered to the cutting edge 10 area. The ventilation side hole 904 is precisely matched with the cutting edge 10, and the ejected airflow directly acts on the high-temperature cutting zone, quickly removing heat and preventing tool softening and workpiece thermal damage. Furthermore, the air guide passage 903 guides the airflow along the direction of the discharge spiral groove 2, taking into account both heat dissipation and chip removal, and improving overall machining efficiency. The four equally angled external reinforcement tubes 902 not only provide ventilation channels but also enhance the structural strength of the support shank 1, extending tool life.

[0018] Reference Figures 1-4 Both ends of the bottom of the transmission box 3 are provided with mounting feet 8, and the outer side wall of the transmission box 3 is evenly provided with heat dissipation fins, and the mounting feet 8 are provided with screw holes. A self-lubricating component 4 is installed on the transmission housing 3, and the self-lubricating component 4 includes a lubricating oil grease installation box 401 that is snapped into the top of the transmission housing 3. The top of the lubricating oil grease installation box 401 is evenly connected with elastic fixing straps 404. The top of the lubricant grease mounting box 401 is evenly provided with limiting holes 403, and the inside of the limiting holes 403 is connected to the oil spreading balls 402 that are in contact with the worm gear 7.

[0019] In use, the user places the paste-like lubricant into the lubricant grease box 401 and secures it with the elastic fixing band 404. In the self-lubricating component 4, the paste-like lubricant in the lubricant grease box 401 contacts the worm gear 7 through the oil-spreading ball 402 in the limiting hole 403. The paste-like lubricant in the lubricant grease box 401 is solid or semi-solid. When the worm gear 7 rotates, its tooth surface continuously rolls and rubs against the oil-spreading ball 402 in the limiting hole 403. The rotation of the oil-spreading ball 402 scrapes off a small amount of paste-like lubricant and evenly transfers it to the tooth surface of the worm gear 7, forming a lubricating film and improving the self-lubricating stability of the transmission structure.

[0020] With an external power supply, the user installs the shaft through which the worm 7 inside the transmission housing 3 passes onto the drive motor of the machine tool. The worm 7 inside the transmission housing 3 meshes with the worm wheel 6 to drive the support handle 1 to rotate smoothly. The cutting edge 10 at the top of the support handle 1 performs drilling operations on the workpiece.

[0021] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A side-hole ventilation type twist drill heat dissipation structure, including a support shank (1); Its features are: The outer wall of the support handle (1) is provided with a spiral groove (2) for discharging material, and the top of the support handle (1) is provided with a cutting edge (10). The bottom of the support handle (1) is equipped with a transmission box (3), and the inside of the transmission box (3) is movably connected with a worm (7) and a worm wheel (6). The support handle (1) is equipped with a ventilation and heat dissipation structure (9), and the ventilation and heat dissipation structure (9) includes a threaded central air passage (901) located in the middle of the inside of the support handle (1), and the bottom of the threaded central air passage (901) is connected to a connecting vertical pipe (905) fixed on the worm gear (6). The ventilation and heat dissipation structure (9) further includes an outer reinforcement tube (902) uniformly fixed to the outer wall of the support handle (1), and the top end of the outer reinforcement tube (902) is provided with a ventilation side hole (904) that matches the cutting edge (10), and the outer wall of the outer reinforcement tube (902) is provided with a guide air channel (903) that matches the material discharge spiral groove (2) and the ventilation side hole (904).

2. The heat dissipating structure of a side hole vented twist drill according to claim 1, wherein: The transmission box (3) has mounting feet (8) at both ends of its bottom, and heat dissipation fins are evenly distributed on the outer side wall of the transmission box (3). The mounting feet (8) are provided with screw holes.

3. The heat dissipation structure of a side-hole venting twist drill according to claim 1, characterized in that: The bottom of the transmission box (3) is equipped with a micro air pump (5), and the input end of the micro air pump (5) is threaded with a filter screen.

4. The heat dissipation structure of a side-hole venting twist drill according to claim 3, characterized in that: A rotary joint is provided between the output end of the micro air pump (5) and the connecting vertical pipe (905), and the vertical center lines of the connecting vertical pipe (905), the worm gear (6), the threaded central air passage (901) and the support handle (1) are on the same vertical line.

5. The heat dissipation structure of a side-hole venting twist drill according to claim 1, characterized in that: Four external reinforcement tubes (902) are provided, and the external reinforcement tubes (902) are distributed at equal angles on the top of the support handle (1). The internal connections of the threaded central air passage (901), the external reinforcement tubes (902) and the ventilation side hole (904) are interconnected.

6. The heat dissipation structure of a side-hole venting twist drill according to claim 1, characterized in that: The transmission housing (3) is equipped with a self-lubricating component (4), and the self-lubricating component (4) includes a lubricating grease mounting box (401) that is snapped into the top of the transmission housing (3), and the top of the lubricating grease mounting box (401) is uniformly connected with an elastic fixing band (404).

7. The heat dissipation structure of a side-hole venting twist drill according to claim 6, characterized in that: The top of the lubricant grease mounting box (401) is uniformly provided with limiting holes (403), and the inside of the limiting holes (403) is connected to oil-distributing balls (402) that are in contact with the worm (7).

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