A butterfly type water-cooled drill bit

Abstract

The application discloses a butterfly-shaped water-cooled drill bit, relates to the technical field of drilling cutters, and comprises a base and a drill bit installed at the bottom of the base, wherein the inside of the drill bit is sequentially provided with a condensation cavity, a micro channel and an evaporation cavity from top to bottom; the number of the micro channels is at least two, and the micro channels are communicated with the condensation cavity and the evaporation cavity; a filling port communicated with the condensation cavity is formed at the center of the upper end of the drill bit; a plugging head capable of being inserted into the inside of the filling port is arranged at the center of the bottom end of the base; and a connecting mechanism is arranged between the base and the drill bit. The micro circulation loop formed by the evaporation cavity, the micro channel and the condensation cavity can well and quickly dissipate the heat generated by the friction of the drill bit, the expensive high-pressure cooling system is not needed, and the whole drilling system is simplified.

Description

Technical Field

[0001] This utility model relates to the field of drilling tool technology, and in particular to a butterfly-shaped water-cooled drill bit. Background Technology

[0002] Machining drill bits are tools used to drill holes in various materials. There are many types of machining drill bits, each with its specific design and purpose, suitable for different materials and processing requirements, and used in machining equipment for positioning and drilling.

[0003] Existing cooling technologies are mainly divided into two types: external casting cooling and internal cooling for drill bits. External casting cooling involves pouring coolant into the outside of the drill bit and the machining area through the machine tool's coolant system. Internal cooling drill bits, on the other hand, have coolant channels designed inside the drill bit. High-pressure coolant enters from the drill shank and is sprayed onto the cutting edge from outlet holes near the drill tip. This is currently the mainstream solution.

[0004] However, it still has the following drawbacks: the coolant is difficult to effectively enter the core area of ​​the drill tip cutting edge, especially inside deep holes, resulting in low cooling efficiency, waste of coolant, and the need for an expensive high-pressure cooling system, which limits its application on ordinary machine tools. Utility Model Content

[0005] To address the issues of low cooling efficiency, waste of coolant, reliance on high-pressure systems (which require expensive high-pressure cooling systems and limit its application on ordinary machine tools), this application provides a butterfly-shaped water-cooled drill bit.

[0006] The butterfly-shaped water-cooled drill bit provided in this application adopts the following technical solution:

[0007] A butterfly-shaped water-cooled drill bit includes a base and a drill bit installed at the bottom of the base. The drill bit has a condensation chamber, a microchannel, and an evaporation chamber arranged sequentially from top to bottom inside. There are at least two microchannels that connect the condensation chamber and the evaporation chamber. An injection port connected to the condensation chamber is opened at the center of the upper end of the drill bit. A plug that can be inserted into the injection port is provided at the center of the bottom end of the base. A connecting mechanism is provided between the base and the drill bit.

[0008] By adopting the above technical solution, the micro-circulation loop formed by the evaporation chamber, micro-channels and condensation chamber facilitates the rapid release of drill bit temperature without the need for traditional expensive high-pressure cooling systems.

[0009] Preferably, the evaporation chamber is located near the tip of the drill bit, and the longitudinal section of the evaporation chamber is circular. The interior of the evaporation chamber is filled with a low-boiling-point cooling medium.

[0010] By adopting the above technical solution, it is possible to ensure that the heat generated by the friction of the drill bit can be quickly transferred to the evaporation chamber, so that the low-boiling-point cooling working fluid can be quickly vaporized, and the heat can be easily transferred to the condensation chamber.

[0011] Preferably, the condensation chamber is located near the drill shank section of the drill bit, and the longitudinal section of the condensation chamber has an inverted teardrop shape.

[0012] By adopting the above technical solution, the condensation chamber with the inverted teardrop shape can be made to quickly liquefy and release heat after the vaporized cooling medium is cooled down.

[0013] Preferably, the upper end of the sealing head is provided with a circular groove, and a sealing ring is fitted inside the groove.

[0014] By adopting the above technical solution, the sealing head can seal the condensation chamber, and the sealing ring can prevent the coolant from overflowing.

[0015] Preferably, the outer diameter of the plug head is adapted to the inner diameter of the injection port.

[0016] By adopting the above technical solution, it is possible to ensure that the injection port is completely blocked, and the sealing head does not penetrate into the condensation cavity to prevent affecting the flow of the cooling medium.

[0017] Preferably, the connecting mechanism includes a ring-shaped locking block integrally formed with the base and a locking groove opened on the upper part of the drill bit. The locking block has an arc-shaped structure, and a limit block is provided at the bottom of the side edge of the locking block.

[0018] By adopting the above technical solution, the limiting block can restrict the card block in the vertical direction of the card slot, which facilitates positioning and installation.

[0019] Preferably, the length of the slot is greater than the length of the block, and a wedge-shaped groove is provided at the bottom corner of the slot to engage with the limiting block.

[0020] By adopting the above technical solution, when the card block is inserted into the appropriate position of the card slot, it can be rotated at a small angle, so that the limiting block can be locked inside the wedge-shaped groove, thereby allowing the card block to be restricted and not disengaged in the vertical direction of the card slot.

[0021] In summary, this application includes at least one of the following beneficial technical effects:

[0022] 1. By utilizing the micro-circulation loop formed by the evaporation chamber, micro-channels, and condensation chamber, the heat generated by drill bit friction can be dissipated quickly and effectively, eliminating the need for an expensive high-pressure cooling system and simplifying the entire drilling system;

[0023] 2. The base and drill bit can be assembled and installed together by the locking action of the locking block and the locking groove. Under the restriction of the limiting block, the locking block can be restricted in the vertical direction of the locking groove. Under high-speed rotation conditions, it can prevent the drill bit from separating from the base during operation. It can also facilitate the quick separation of the base and drill bit when not in use. Attached Figure Description

[0024] Figure 1 This is a schematic diagram illustrating the cross-sectional structure of a water-cooled drill bit, representing a key embodiment of this application.

[0025] Figure 2 This is a schematic diagram of the overall structure of a butterfly-shaped water-cooled drill bit according to an embodiment of this application;

[0026] Figure 3 The embodiments of this application mainly embody Figure 2 A schematic diagram of the enlarged structure of part A in the diagram;

[0027] Figure 4 This is a schematic diagram illustrating the main structure of the base, the card block, and the sealing head in the embodiments of this application;

[0028] Reference numerals: 1. Base; 2. Drill bit; 3. Condensation chamber; 4. Evaporation chamber; 5. Microchannel; 6. Inlet; 7. Plug; 8. Sealing ring; 9. Locking block; 10. Locking groove; 11. Limiting block; 12. Groove. Detailed Implementation

[0029] The following is in conjunction with the appendix Figures 1-4 This application will be described in further detail.

[0030] This application discloses a butterfly-shaped water-cooled drill bit.

[0031] Reference Figure 1-3A butterfly-shaped water-cooled drill bit includes a base 1 and a drill bit 2 mounted on the bottom of the base 1. The cutting edge of the drill bit 2 is butterfly-shaped. The interior of the drill bit 2, from top to bottom, comprises a condensation chamber 3, microchannels 5, and an evaporation chamber 4. There are at least two microchannels 5 connecting the condensation chamber 3 and the evaporation chamber 4. The evaporation chamber 4 is located near the tip of the drill bit 2 and has a circular cross-section. The interior of the evaporation chamber 4 is filled with a low-boiling-point cooling medium, which can be Novec series electronic fluorine. The cooling medium can be liquefied, such as ethanol. The condensing chamber 3 is located near the shank of the drill bit 2. The longitudinal section of the condensing chamber 3 is in the shape of an inverted water droplet. The inverted water droplet-shaped condensing chamber 3 can allow the vaporized cooling medium to quickly liquefy and release heat after cooling. An injection port 6 connected to the condensing chamber 3 is provided at the center of the upper end of the drill bit 2. The injection port 6 can facilitate the injection and pouring out of the cooling medium for replacement. In addition, the drill bit 2 in this application can be made by 3D metal printing or other methods, thereby realizing the formation of its internal channels and cavities.

[0032] Reference Figure 3-4 A plugging head 7, which can be inserted into the injection port 6, is provided at the center of the bottom end of the base 1. A connecting mechanism is provided between the base 1 and the drill bit 2. The connecting mechanism includes a locking block 9 that is distributed in a ring and integrally formed with the base 1, and a locking groove 10 opened on the upper section of the drill bit 2. The locking block 9 has an arc-shaped structure. A limiting block 11 is provided at the bottom edge of the side of the locking block 9. The groove length of the groove 10 is greater than the length of the locking block 9, and a wedge-shaped groove that engages with the limiting block 11 is opened at the bottom corner of the groove 10. Through the setting of the locking block 9 and the locking groove 10, quick positioning can be achieved first. When the locking block 9 is inserted into the appropriate position of the locking groove 10, it can be rotated at a small angle so that the limiting block 11 can be locked inside the wedge-shaped groove. This allows the locking block 9 to be restricted in the vertical direction of the locking groove 10 and not to disengage. This ensures that the drill bit 2 does not separate from the base 1 during operation under high-speed rotation conditions.

[0033] Reference Figure 2-4 The upper end of the plugging head 7 is provided with a circular groove 12, and a sealing ring 8 is fitted inside the groove 12. The outer diameter of the plugging head 7 is matched with the inner diameter of the injection port 6, so as to ensure that the injection port 6 is completely blocked, and the plugging head 7 does not penetrate into the condensation chamber 3 to prevent affecting the flow of the cooling medium.

[0034] The implementation principle of this utility model is as follows: the cutting heat generated during drilling is rapidly conducted to the evaporation chamber 4 in the circuit, causing the internal cooling medium to boil and vaporize, which is a phase change heat absorption process. The phase change process can absorb the huge amount of heat generated by the drill bit 2 during drilling, and the efficiency is much higher than that of traditional liquid convection heat transfer. The generated high-pressure steam flows to the lower temperature condensation chamber 3 through multiple micro channels 5 under the action of pressure difference. The base 1 is in contact with the machine tool spindle or jacket, and is simultaneously subjected to a small amount of external coolant flushing the drill bit 2, which can carry away the heat of the condensation chamber 3. In this way, the cooling medium inside the condensation chamber 3 liquefies and releases heat in the condensation section. The liquefied condensate then flows back to the evaporation chamber 4 automatically through the micro channels 5 under the action of gravity, completing an automatic cycle. The whole process does not require a mechanical pump and is a self-driven high-efficiency thermal management method. It directly and quickly dissipates the heat of the core hot area to the outside, with high cooling intensity and no need for an external high-pressure liquid source.

[0035] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A butterfly-shaped water-cooled drill bit, comprising a base (1) and a drill bit (2) mounted on the bottom of the base (1), characterized in that: The drill bit (2) has a condensation chamber (3), a microchannel (5) and an evaporation chamber (4) arranged sequentially from top to bottom inside. There are at least two microchannels (5) that connect the condensation chamber (3) and the evaporation chamber (4). An injection port (6) connected to the condensation chamber (3) is provided at the center of the upper end of the drill bit (2). A plug head (7) that can be inserted into the injection port (6) is provided at the center of the bottom end of the base (1). A connecting mechanism is provided between the base (1) and the drill bit (2).

2. The butterfly-shaped water-cooled drill bit according to claim 1, characterized in that: The evaporation chamber (4) is close to the tip of the drill bit (2), and the longitudinal section of the evaporation chamber (4) is circular. The interior of the evaporation chamber (4) is filled with a low-boiling-point cooling medium.

3. A butterfly-shaped water-cooled drill bit according to claim 2, characterized in that: The condensation chamber (3) is located near the drill shank section of the drill bit (2), and the longitudinal section of the condensation chamber (3) has an inverted teardrop shape.

4. A butterfly-shaped water-cooled drill bit according to claim 3, characterized in that: The upper end of the sealing head (7) is provided with a circular groove (12), and a sealing ring (8) is provided inside the groove (12).

5. A butterfly-shaped water-cooled drill bit according to claim 4, characterized in that: The outer diameter of the plug (7) is matched with the inner diameter of the injection port (6).

6. A butterfly-shaped water-cooled drill bit according to claim 5, characterized in that: The connecting mechanism includes a ring-shaped locking block (9) integrally formed with the base (1) and a locking groove (10) opened on the upper section of the drill bit (2). The locking block (9) has an arc-shaped structure, and a limit block (11) is provided at the bottom of the side edge of the locking block (9).

7. A butterfly-shaped water-cooled drill bit according to claim 6, characterized in that: The length of the slot (10) is greater than the length of the card block (9), and a wedge-shaped groove is provided at the bottom corner of the slot (10) to engage with the limiting block (11).

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