CN211588644U - Twist drill based on phase change cooling - Google Patents
Twist drill based on phase change cooling Download PDFInfo
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- CN211588644U CN211588644U CN201921483901.5U CN201921483901U CN211588644U CN 211588644 U CN211588644 U CN 211588644U CN 201921483901 U CN201921483901 U CN 201921483901U CN 211588644 U CN211588644 U CN 211588644U
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- twist drill
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- phase change
- fluted drill
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Abstract
The utility model discloses a fluted drill based on phase transition cooling relates to the machining field, including fluted drill, fluted drill includes cutting part and stalk portion, is hollow structure in cutting part and the stalk portion, and hollow structure is on a parallel with the direction of stalk portion axis, hollow structure's one end are close fluted drill's main cutting edge and chisel edge region, and hollow structure's the other end and the tip isoplane of stalk portion, hollow structure's tip set up sealing screw and seal, and the interior compound phase change material that packs of hollow structure. The utility model discloses dispel the heat with the help of composite phase change material, the titanium nitride coating improves high temperature resistance and wearability, improves fluted drill's life, need not save the expense with the help of outside flowing medium and auxiliary assembly, the utility model discloses a fluted drill simple structure uses portably in actual production, promotes easily.
Description
Technical Field
The utility model relates to a machining field, concretely relates to fluted drill based on phase transition cooling.
Background
In the machining industry, the cutting heat is always a problem generally concerned by people and is also a technical key to be solved urgently by enterprises. The cutting process generates a lot of cutting heat, which is transferred into the tool, causing the temperature of the cutting portion of the tool to rise. Excessive cutting temperatures will accelerate wear of the tool, such as diffusion wear, adhesive wear and chemical wear, thereby reducing tool durability and causing premature failure of the tool.
The drilling process belongs to semi-closed process, during cutting, the twist drill does not only main motion, but also feed motion, so the generated cutting heat is much and is not easy to radiate. Therefore, a large amount of cutting heat is accumulated in a chisel edge area and a main cutting edge area of a cutting part of the twist drill, and further the abrasion failure of the cutting part is accelerated, so that the cutting heat is quickly and effectively transmitted, and the cutting heat is very important for ensuring the durability of the twist drill and obtaining the necessary processing precision of parts.
At present, the cutting temperature of the twist drill is reduced by using the cutting fluid commonly used at home and abroad, but for drilling, the cutting fluid can cause cutting chips to flow into a workpiece, such as the inner surface of a hole, so that the manufacturing precision of the workpiece is reduced; more importantly, the cutting fluid contains toxic chemical substances, can pollute the environment, is harmful to operators and can increase the production cost of enterprises, for example, the cost of purchasing and processing the cutting fluid in the manufacturing industry of the United states accounts for 36 percent of the total manufacturing cost of the whole product.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem in the prior art, the utility model aims to provide a twist drill which can automatically reduce the cutting temperature of the twist drill and prolong the service life of the twist drill.
In order to achieve the above object, the utility model provides a following technical scheme:
the utility model provides a fluted drill based on phase transition cooling, includes fluted drill, fluted drill includes cutting part and stalk portion, the cutting part with be hollow structure in the stalk portion, hollow structure is on a parallel with the direction of stalk portion axis, hollow structure's one end is close fluted drill's main cutting edge and chisel edge region, hollow structure's the other end with the tip isoplanar of stalk portion, hollow structure's tip sets up sealing screw and seals, composite phase change material is filled in hollow structure.
Preferably, the volume of the composite phase change material at 25 ℃ accounts for 75-80% of the volume of the hollow structure.
Preferably, the twist drill is a standard straight shank twist drill with a diameter of 3, 3.5, 6, 10 or 20 mm.
Preferably, the cutting portion includes a chisel edge, a main cutter and a minor cutting edge.
Preferably, the surface of the cutting portion is provided with a titanium nitride coating.
Preferably, the composite phase change material comprises a phase change material, a thermally conductive filler and a nucleating agent.
Preferably, the phase transition temperature of the composite phase change material is 40-75 ℃, and the thermal conductivity is 1-30W/(m.K).
Preferably, the phase-change material accounts for 70-95% by mass, the addition amount of the nucleating agent is 0.5-5%, and the addition amount of the heat-conducting filler is 4.5-25%.
Preferably, the phase-change material contains 60-80% by mass of low-melting-point tin-bismuth-lead alloy.
Preferably, the phase-change material also contains one or more of paraffin, sodium acetate trihydrate, sodium thiosulfate pentahydrate, disodium hydrogen phosphate dodecahydrate, sodium sulfate decahydrate, sodium carbonate decahydrate, polyethylene glycol and n-butyl stearate, and the mass part of the phase-change material is 20-40%.
Preferably, the nucleating agent is selected from one or more of borax, anhydrous disodium hydrogen phosphate, diatomite, silicon dioxide, sodium silicate, strontium hydroxide octahydrate, strontium chloride hexahydrate and sodium thiosulfate pentahydrate.
Preferably, the heat conducting filler is selected from one or more of expanded graphite, carbon nano tubes, heat conducting carbon fibers, graphene, three-dimensional graphite foam, silicon carbide, copper powder and aluminum powder.
Compared with the prior art, the beneficial effects of the utility model are that:
(1) the utility model continuously transmits the heat of the twist drill to the outside by means of the composite phase-change material, thereby strengthening the heat radiation condition of the drill bit and reducing the temperature of the drill bit, thereby prolonging the service life of the twist drill; the titanium nitride coating can improve the high temperature resistance and the wear resistance of the twist drill and further improve the service life of the twist drill.
(2) Since the composite phase-change material does not need to be used for heat dissipation by means of external flowing media and auxiliary equipment, the expensive expense of the auxiliary equipment and the use and treatment expense of external cooling media are saved.
(3) The utility model discloses a twist drill simple structure, its use does not have special requirement, uses portably in actual production, promotes easily.
Drawings
Fig. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the principle structure of the present invention;
FIG. 3 is a schematic structural diagram of a drill bit according to the present invention;
fig. 4 is a schematic structural view of an end portion of the handle portion in the present invention;
description of the labeling: 1-cutting part, 2-handle, 3-hollow structure, 4-sealing screw, 5-composite phase change material, 6-chisel edge and 7-main cutting knife.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Please refer to fig. 1-4, the utility model discloses a twist drill based on phase transition cooling, including the twist drill, the twist drill includes cutting part 1 and stalk portion 2, cutting part 1 with be hollow structure 3 in the stalk portion 2, hollow structure 3 is on a parallel with the direction of 2 axes of stalk portion, hollow structure 3's one end is close main cutting edge and chisel edge 6 region of twist drill, hollow structure 3's the other end with the tip isoplanar of stalk portion 2, hollow structure 3's tip sets up sealing screw 4 and seals, fill composite phase change material 5 in hollow structure 3.
By means of the sealing screw 4, the composite phase change material 5 can thus be replaced as desired.
Further, referring to fig. 2, the volume of the composite phase change material 5 at 25 ℃ is 75-80% of the volume of the hollow structure 3.
Further, the twist drill is a standard straight shank twist drill with the diameter of 3, 3.5, 6, 10 or 20 mm.
Further, the cutting portion 1 includes a chisel edge 6, a main cutting blade 7, and a minor cutting edge.
Further, the surface of the cutting portion 1 is provided with a titanium nitride coating. The titanium nitride coating can improve the high temperature resistance and the wear resistance of the twist drill and prolong the service life of the twist drill.
Further, the composite phase change material 5 includes a phase change material, a thermally conductive filler, and a nucleating agent.
Further, the phase change temperature of the composite phase change material 5 is 40-75 ℃, and the thermal conductivity is 1-30W/(m.K).
Further, the phase-change material accounts for 70-95% by mass, the addition amount of the nucleating agent is 0.5-5%, and the addition amount of the heat-conducting filler is 4.5-25%.
Further, the phase-change material contains 60-80% by mass of low-melting-point tin-bismuth-lead alloy. The low melting point Sn-Bi-Pb alloy has a melting point of 70-90 deg.C and an expansion rate of 0.01%.
Further, the phase-change material also contains one or more of paraffin, sodium acetate trihydrate, sodium thiosulfate pentahydrate, disodium hydrogen phosphate dodecahydrate, sodium sulfate decahydrate, sodium carbonate decahydrate, polyethylene glycol and n-butyl stearate, and the mass portion of the phase-change material is 20-40%.
Further, the nucleating agent is selected from one or more of borax, anhydrous disodium hydrogen phosphate, diatomite, silicon dioxide, sodium silicate, strontium hydroxide octahydrate, strontium chloride hexahydrate and sodium thiosulfate pentahydrate.
Further, the heat-conducting filler is selected from one or more of expanded graphite, carbon nano tubes, heat-conducting carbon fibers, graphene, three-dimensional graphite foam, silicon carbide, copper powder and aluminum powder.
The parts not specifically described in this embodiment are commercially available materials or parts.
To further illustrate the present invention, reference is made to the following examples:
example 1
The utility model provides a fluted drill based on phase transition cooling, includes fluted drill, fluted drill includes cutting part 1 and stalk portion 2, is hollow structure 3 in cutting part 1 and the stalk portion 2, and hollow structure 3 is on a parallel with the direction of 2 axes of stalk portion, and hollow structure 3's one end is close fluted drill's main cutting edge and chisel edge 6 region, and hollow structure 3's the other end and the tip isoplanar of stalk portion 2, and hollow structure 3's tip sets up sealing screw 4 and seals, and hollow structure 3 intussuseption is filled with compound phase change material 5.
Specifically, the volume of the composite phase-change material 5 at 25 ℃ accounts for 75% of the volume of the hollow structure 3; the twist drill is a standard straight shank twist drill with the diameter of 3.5; the cutting portion 1 comprises a chisel edge 6, a main cutting edge 7 and a minor cutting edge; the surface of the cutting part 1 is provided with a titanium nitride coating. The composite phase change material 5 comprises a phase change material, a thermally conductive filler and a nucleating agent. The phase transition temperature of the composite phase change material 5 is 75 ℃, and the thermal conductivity is 28W/(m.K). 70 percent of phase-change material, 5 percent of nucleating agent and 25 percent of heat-conducting filler, wherein the phase-change material contains 80 percent of low-melting-point tin-bismuth-lead alloy by mass and also contains paraffin (C)20H42) And n-butyl stearate accounting for 20 mass percent of the phase change material; the nucleating agent is selected from diatomite, and the heat-conducting filler is selected from heat-conducting carbon fiber.
Example 2
The utility model provides a fluted drill based on phase transition cooling, includes fluted drill, fluted drill includes cutting part 1 and stalk portion 2, is hollow structure 3 in cutting part 1 and the stalk portion 2, and hollow structure 3 is on a parallel with the direction of 2 axes of stalk portion, and hollow structure 3's one end is close fluted drill's main cutting edge and chisel edge 6 region, and hollow structure 3's the other end and the tip isoplanar of stalk portion 2, and hollow structure 3's tip sets up sealing screw 4 and seals, and hollow structure 3 intussuseption is filled with compound phase change material 5.
Specifically, the volume of the composite phase change material 5 at 25 ℃ accounts for 80% of the volume of the hollow structure 3; the twist drill is a standard straight shank twist drill with the diameter of 6 mm; the cutting portion 1 comprises a chisel edge 6, a main cutting edge 7 and a minor cutting edge; the surface of the cutting part 1 is provided with a titanium nitride coating. The composite phase-change material 5 comprises a phase-change material, a heat-conducting filler and a nucleating agent, wherein the phase-change temperature of the composite phase-change material 5 is 45 ℃, and the heat conductivity is 28W/(m.K). The phase-change material comprises 80 mass percent of phase-change material, 3 mass percent of nucleating agent and 17 mass percent of heat-conducting filler, wherein the phase-change material contains 60 mass percent of low-melting-point tin-bismuth-lead alloy, and the phase-change material also contains a mixture of sodium acetate trihydrate, polyethylene glycol and n-butyl stearate, which accounts for 40 mass percent of the phase-change material; the nucleating agent is selected from a mixture of borax and sodium silicate, and the heat-conducting filler is selected from a mixture of expanded graphite and aluminum powder.
Example 3
The utility model provides a fluted drill based on phase transition cooling, includes fluted drill, fluted drill includes cutting part 1 and stalk portion 2, is hollow structure 3 in cutting part 1 and the stalk portion 2, and hollow structure 3 is on a parallel with the direction of 2 axes of stalk portion, and hollow structure 3's one end is close fluted drill's main cutting edge and chisel edge 6 region, and hollow structure 3's the other end and the tip isoplanar of stalk portion 2, and hollow structure 3's tip sets up sealing screw 4 and seals, and hollow structure 3 intussuseption is filled with compound phase change material 5.
Specifically, the volume of the composite phase change material 5 at 25 ℃ accounts for 80% of the volume of the hollow structure 3; the twist drill is a standard straight shank twist drill with the diameter of 20 mm; the cutting part 1 comprises a chisel edge 6, a main cutting edge 7 and a minor cutting edge, and the surface of the cutting part 1 is provided with a titanium nitride coating. The composite phase-change material 5 comprises a phase-change material, a heat-conducting filler and a nucleating agent, wherein the phase-change temperature of the composite phase-change material 5 is 60 ℃, and the heat conductivity is 20W/(m.K). The phase-change material accounts for 80% by mass, the nucleating agent accounts for 5% by mass, the heat-conducting filler accounts for 15% by mass, the phase-change material contains 70% by mass of low-melting-point tin-bismuth-lead alloy, and the phase-change material also contains a mixture of disodium hydrogen phosphate dodecahydrate, sodium sulfate decahydrate and sodium carbonate decahydrate, which accounts for 30% by mass of the phase-change material; the nucleating agent is selected from a mixture of strontium hydroxide octahydrate and sodium thiosulfate pentahydrate, and the heat-conducting filler is selected from a mixture of carbon nano tubes and three-dimensional graphite foam.
The working principle is illustrated in the embodiment 1 as follows: using low melting point Sn-Bi-Pb alloy and paraffin wax (C)20H42) N-butyl stearate, diatomite and leadThe composite phase-change material 5 is composed of hot carbon fibers, the phase-change temperature of the composite phase-change material 5 is 75 ℃, the twist drill continuously accumulates heat during working, when the internal temperature of the twist drill is higher than 75 ℃, the composite phase-change material 5 absorbs heat from the twist drill and gradually changes from a liquid state to a solid state, the temperature of the twist drill is maintained to be not higher than 75 ℃ within a long time, and when the twist drill stops working and the ambient temperature is lower than 75 ℃, the composite phase-change material 5 releases heat and gradually changes from the solid state to the liquid state to the environment. In addition, when the content of paraffin or the type and the proportion of carbon number and fatty acid in the composite phase-change material 5 are changed, the temperature regulating capacity of the twist drill is changed, for example: the heat preservation time is prolonged by increasing the content of paraffin in the phase transition. Similarly, when the content of the low-melting-point tin-bismuth-lead alloy or the proportion of the tin-bismuth-lead in the composite phase-change material 5 is changed, the temperature regulating capability of the twist drill is changed accordingly, for example, the phase-change temperature is increased when the content of the lead is increased.
The utility model discloses the 5 phase transition temperature of composite phase change material that adopt is adjustable (40-75 ℃), and circulation stability is good, and more importantly thermal conductivity is high and adjustable (1-30W/(m K)), can really realize the cooling of fluted drill.
The utility model continuously transmits the heat of the twist drill to the outside by means of the composite phase-change material 5, thereby strengthening the heat radiation condition of the drill bit and reducing the temperature of the drill bit, thereby prolonging the service life of the twist drill; the titanium nitride coating can improve the high temperature resistance and the wear resistance of the twist drill and further improve the service life of the twist drill; since the composite phase-change material 5 does not need to dissipate heat by means of external flowing media and auxiliary equipment, the expensive expense of the auxiliary equipment and the use and treatment expense of external cooling media are saved; the utility model discloses a twist drill simple structure, its use does not have special requirement, uses portably in actual production, promotes easily.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (5)
1. The twist drill based on phase change cooling comprises a twist drill body and is characterized in that the twist drill body comprises a cutting part and a handle part, the cutting part and the handle part are internally provided with a hollow structure, the hollow structure is parallel to the axis direction of the handle part, one end of the hollow structure is close to a main cutting edge and a chisel edge area of the twist drill body, the other end of the hollow structure is coplanar with the end part of the handle part, a sealing screw is arranged at the end part of the hollow structure to seal the end part, and a composite phase change material is filled in the hollow structure.
2. The twist drill based on phase change cooling of claim 1, wherein the volume of the composite phase change material at 25 ℃ is 75-80% of the volume of the hollow structure.
3. The twist drill based on phase change cooling of claim 1, wherein the twist drill is a standard straight shank twist drill with a diameter of 3, 3.5, 6, 10 or 20 mm.
4. The twist drill based on phase change cooling of claim 1, wherein the cutting portion comprises a chisel edge, a primary cutting edge and a secondary cutting edge.
5. The twist drill based on phase change cooling of claim 1, wherein: the surface of the cutting part is provided with a titanium nitride coating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921483901.5U CN211588644U (en) | 2019-09-08 | 2019-09-08 | Twist drill based on phase change cooling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921483901.5U CN211588644U (en) | 2019-09-08 | 2019-09-08 | Twist drill based on phase change cooling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211588644U true CN211588644U (en) | 2020-09-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921483901.5U Active CN211588644U (en) | 2019-09-08 | 2019-09-08 | Twist drill based on phase change cooling |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211588644U (en) |
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- 2019-09-08 CN CN201921483901.5U patent/CN211588644U/en active Active
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