CN114932253A - Cutter with inner-cooling jet structure - Google Patents
Cutter with inner-cooling jet structure Download PDFInfo
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- CN114932253A CN114932253A CN202210698598.0A CN202210698598A CN114932253A CN 114932253 A CN114932253 A CN 114932253A CN 202210698598 A CN202210698598 A CN 202210698598A CN 114932253 A CN114932253 A CN 114932253A
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- 238000001816 cooling Methods 0.000 title claims abstract description 149
- 239000000110 cooling liquid Substances 0.000 claims abstract description 35
- 230000008602 contraction Effects 0.000 claims abstract description 13
- 238000004891 communication Methods 0.000 claims description 2
- 238000005520 cutting process Methods 0.000 abstract description 51
- 238000003754 machining Methods 0.000 abstract description 16
- 230000000694 effects Effects 0.000 abstract description 11
- 230000001050 lubricating effect Effects 0.000 abstract description 9
- 238000000889 atomisation Methods 0.000 abstract description 3
- 238000005553 drilling Methods 0.000 description 12
- 239000002826 coolant Substances 0.000 description 10
- 239000000463 material Substances 0.000 description 9
- 238000009826 distribution Methods 0.000 description 8
- 238000012545 processing Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 239000012809 cooling fluid Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 210000001503 joint Anatomy 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 229910000760 Hardened steel Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 229910010037 TiAlN Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000002173 cutting fluid Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B51/00—Tools for drilling machines
- B23B51/06—Drills with lubricating or cooling equipment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B47/00—Constructional features of components specially designed for boring or drilling machines; Accessories therefor
- B23B47/34—Arrangements for removing chips out of the holes made; Chip- breaking arrangements attached to the tool
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Drilling Tools (AREA)
- Drilling And Boring (AREA)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
Abstract
The invention provides a cutter with an internal cooling jet structure, which relates to the field of cutting machining cutters and comprises a drill bit, wherein a spiral cooling channel is arranged in the drill bit, and one end of the cooling channel extends to the drill point of the drill bit to be used as an outlet; the cooling channel is communicated with the outside through a jet hole preset in the side face of the drill bit, a contraction part is arranged in the cooling channel close to the outlet, and the radial sectional area of the contraction part is smaller than the radial sectional areas of other areas of the cooling channel, so that cooling liquid is atomized at the outlet; aiming at the problem of poor cooling effect in the current drill bit cutter machining process, the cooling liquid is conveyed through the cooling channel, the cooling liquid is sprayed out from the outlet of the drill bit tip and the lateral jet hole, the cooling liquid after the dispersed atomization is output from the outlet can cool and lubricate the cutting position, and the jet flow of the cooling liquid output from the jet hole can wash cuttings out from the drill bit blade groove, so that the cooling and lubricating requirements are met.
Description
Technical Field
The invention relates to the field of cutting machining tools, in particular to a tool with an internal cooling jet structure.
Background
To reduce the adverse effects of excessive cutting temperatures on the machining process and tool life, cooling and lubricating the tool is typically performed using a cooling medium. To traditional pouring cutting fluid cooling mode, the main problem that exists includes that coolant pressure is lower, the infiltration ability is relatively poor, is difficult to get into the cutting area and carries out effective cooling, and along with cutting speed improves the cooling effect and is showing and reduce moreover, cutting efficiency receives the restriction. Therefore, the development of a novel cutter with a cooling structure can enhance the heat exchange efficiency of cooling liquid in a cutting area, and the method has important significance for improving the cutting performance of the cutter, prolonging the service life of the cutter and ensuring the processing quality, and is particularly important for the efficient processing of parts made of materials difficult to process, such as titanium alloy, high-temperature alloy, high-strength steel, vermicular cast iron and the like.
The use of an internally cooled drill bit provides some relief from the above-mentioned problems. The inner cooling drill bit is characterized in that the inner cooling drill bit is provided with a cooling hole which penetrates through the shank of the drill bit to the drill tip, and compressed air, cooling liquid or cooling oil is sprayed to a machining area through the inner cooling hole during drilling machining so as to quickly cool a machining surface and the drill tip and reduce the cutting temperature of a cutter. Compared with the conventional drill bit, the inner-cooling drill bit has better working performance, can reduce the damage of high temperature to the drill bit during high-speed processing of the drill bit and prolong the service life of the drill bit.
The currently applied internal cooling drill bit mainly comprises a central single-hole internal cooling drill, a double-cooling-pipe type internal cooling drill, a double-spiral-hole internal cooling drill and the like, wherein the double-spiral-hole internal cooling drill has a good machining effect. However, the conventional internally-cooled drill bits all have a common problem that, when the coolant is directly sprayed to the drill tip from the drill bit shank through the cooling hole, although a certain cooling effect is exerted on the cutting edge and the drill tip region, the coolant has insufficient covering surface to the cutting edge and the drill tip and insufficient coolant flow, the cooling surface is unreasonably distributed, and the chips accumulated in the cutting edge groove are not sufficiently washed away, so that the chip removal effect is not ideal. In addition, the cross section of the cooling channel of the current inner cooling drill bit is mostly regular and circular, the size of the inner cooling channel lacks the design basis, and the technical advantages of inner cooling processing are not fully exerted.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a cutter with an inner-cooling jet structure, wherein a cooling channel can convey cooling liquid, the cooling liquid is sprayed out from an outlet at the drill point of a drill bit and a jet hole on the side surface, the outlet outputs the dispersed and atomized cooling liquid to cool and lubricate the cutting position, and the jet flow of the cooling liquid output by the jet hole can wash cuttings out from the edge groove of the drill bit, so that the cooling and lubricating requirements are met.
A cutter with an inner-cooling jet structure adopts the following scheme:
the spiral cooling channel is arranged in the drill bit, and one end of the cooling channel extends to the drill point of the drill bit to be used as an outlet; the cooling channel is communicated with the outside through a jet hole preset in the side face of the drill bit, a contraction part is arranged in the cooling channel close to the outlet, and the radial sectional area of the contraction part is smaller than the radial sectional areas of other areas of the cooling channel, so that cooling liquid is atomized at the outlet.
Further, the cooling channel has the same track line as the land track line of the drill bit, and the cooling channel is spaced from the side of the drill bit.
Furthermore, the cooling channel track line and the cutting edge track line are arranged in parallel, and the section shape of the cooling channel and the section shape of the cutting edge groove of the drill bit are similar in graph along the radial direction of the drill bit.
Furthermore, the jet hole is positioned in the blade groove, one axial end of the jet hole is communicated with the cooling channel, and the other axial end of the jet hole extends to the blade groove.
Furthermore, each edge groove is internally provided with a jet hole, and the jet holes are sequentially arranged at intervals along the extending direction of the edge groove.
Furthermore, a plurality of cooling channels are arranged in the drill bit, and the cooling channels are arranged in one-to-one correspondence with the cutting edges.
Further, the cooling channel between the constriction and the outlet forms an expansion section, and the cooling channel between the constriction and the drill bit shank forms a conveying section; the cross-sectional area of the conveying section is larger than that of the expanding section along the radial direction of the drill bit.
Furthermore, the outlet is positioned on the back of the drill point of the drill, and outlets are uniformly distributed on the back of two sides of the axis of the drill.
Furthermore, a straight hole channel is arranged in the drill handle of the drill bit, one end of the straight hole channel is in butt joint with the spiral channel and is far away from one end of the outlet, and the other end of the straight hole channel extends to the tail end of the drill handle of the drill bit to serve as an inlet.
Further, the straight hole channels are communicated with the spiral channels in a one-to-one correspondence mode, and the straight hole channels are arranged at intervals around the axis of the drill bit.
Compared with the prior art, the invention has the advantages and positive effects that:
(1) the cooling liquid is conveyed through the cooling channel to solve the problem that the cooling effect is poor when the current drill bit cutter is machined, the cooling liquid is sprayed out from the drill bit drilling tip and the side jet hole, the cooling liquid after dispersed atomization is output from the outlet can cool and lubricate the cutting position, and the jet flow of the cooling liquid output from the jet hole can wash cuttings out from the drill bit cutting edge groove, so that the cooling and lubricating requirements are met.
(2) The drill bit is provided with a conformal inner cooling spiral linear cooling channel and a jet hole positioned in the blade groove, high-pressure cooling liquid can respectively reach the drill point and the blade groove of the drill bit, a good cooling and lubricating effect is achieved on a drilling area, and meanwhile cuttings accumulated at the drill point and the blade groove can be timely discharged, so that the abrasion of the drill bit is favorably reduced.
(3) The cross-sectional shape of the cooling channel in the drill bit is similar to that of the blade groove, meanwhile, the trajectory of the cooling channel is the same as the distribution trajectory of the cutting blade zone of the drill bit and the distribution trajectory of the blade groove, the cooling effect of cooling liquid on the cutting edge and the drill point of the drill bit can be improved, the cooling channel is close to the blade zone and the blade groove, the blade zone and the blade groove can be cooled in advance from the inside, and in addition, more reasonable cooling liquid flow distribution can be realized.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
Fig. 1 is a schematic view of the external structure of a drill bit according to embodiment 1 of the present invention.
FIG. 2 is a schematic view showing the distribution of cooling channels inside the drill bit according to example 1 of the present invention.
FIG. 3 is a schematic view of the expansion section of the cooling passage in the drill bit according to example 1 of the present invention.
FIG. 4 is a schematic end view of the drill tip of the drill according to example 1 of the present invention.
Fig. 5 is a comparative diagram showing the result of the cooling passage fluid dynamics simulation at an inlet pressure of 20bar in example 1 of the present invention.
Fig. 6 is a comparative graph showing the result of the cooling passage fluid dynamics simulation at an inlet pressure of 30bar in example 1 of the present invention.
Fig. 7 is a schematic diagram showing a comparison of the results of the flow field distribution rule of the jet hole in embodiment 1 of the present invention.
In the figure, 1, a drill shank, 2, a drill bit, 3, a blade groove, 4, an outlet, 5, a straight hole channel, 6, a cooling channel, 7, a straight hole, 8, a straight hole, 9, a straight hole, 10, a straight hole, 11, a straight hole, 12, a contraction part, 13 and an expansion section.
Detailed Description
Example 1
In an exemplary embodiment of the present invention, a tool with an internally cooled fluidic structure is shown in fig. 1-7.
The cutter with the internal cooling jet structure as shown in figures 1 and 2 is used for drilling and machining difficult-to-machine materials, in particular to a drill bit 2 with a double-spiral blade groove 3, a cooling channel 6 is arranged inside the cutter as a conformal internal cooling high-pressure jet structure, high-pressure cooling liquid is directly injected into the internal cooling channel 6 from a drill handle 1 of the drill bit 2 in the drilling process, and the cooling liquid is sprayed out from an outlet 4 of the cooling channel 6 at the drill point and a jet hole straight hole at the blade groove 3 to play the roles of cooling and lubricating and punching chips out from the blade groove 3 of the drill bit 2, so that the service life of the drill bit 2 can be prolonged, the machining quality can be improved, and the cutter is suitable for high-speed and high-efficiency drilling and machining of the difficult-to-machine materials such as high-temperature alloy, hardened steel and the like.
As shown in figure 1, the cutter with the inner cooling jet structure mainly comprises a drill handle 1 of a drill bit 2 and a main body of the drill bit 2, and the two parts are of an integral structure, so that the rigidity of the cutter can be ensured, and the cutter is favorable for processing stability.
As shown in fig. 2, a spiral cooling channel 6 is provided in the drill 2, and one end of the cooling channel 6 extends to the drill tip of the drill 2 as an outlet 4. The cooling channels 6 can be arranged in the main body of the drill bit 2 in a plurality of numbers corresponding to the spiral blade grooves 3 on the drill bit 2, when the plurality of cooling channels 6 are arranged, all the cooling channels 6 are annularly arranged around the axis of the drill bit 2 at intervals, the cooling channels 6 are distributed in a separated mode, and each cooling channel 6 can independently cool the drill bit 2.
The cooling channel 6 is communicated with the outside through a jet hole preset in the side face of the drill bit 2, a contraction part 12 is arranged in the cooling channel 6 close to the outlet 4, and the radial sectional area of the contraction part 12 is smaller than the radial sectional areas of other areas of the cooling channel 6, so that cooling liquid is atomized at the position of the outlet 4.
A straight hole channel 5 is arranged in the drill handle 1 of the drill bit 2, one end of the straight hole channel 5 is in butt joint with one end of the spiral channel far away from the outlet 4, and the other end of the straight hole channel 5 extends to the tail end of the drill handle 1 of the drill bit 2 to serve as an inlet.
As shown in fig. 2, in this embodiment, taking two cooling channels 6 and two straight-hole channels 5 as an example, two straight-hole channels 5 located in the drill bit 2 are symmetrically arranged with respect to the axis of the drill bit 2, two symmetrically arranged cooling channels 6 located in the main body of the drill bit 2, the straight-hole channels 5 are in one-to-one correspondence communication with the spiral channels, and a plurality of straight-hole channels 5 are arranged at intervals around the axis of the drill bit 2.
The helix angle and the thread pitch of the cooling channel 6 in the drill bit 2 are consistent with those of the cutting edge groove 3, the track line of the cooling channel 6 is the same as that of the cutting edge of the drill bit 2, and the distance between the cooling channel 6 and the side face of the drill bit 2 is kept, so that a good cooling effect is guaranteed for the cutting edge at the end part of the drill bit 2 and the cutting edge of the outer wall cutting edge of the drill bit 2.
Straight holes communicated with the cooling channel 6 are uniformly distributed at the position of the edge groove 3 of the drill bit 2, the straight holes are used as jet holes for outputting cooling liquid to form jet flow, the cooling liquid is sprayed out from the jet holes at the position of the edge groove 3 through the cooling channel 6, and the coolant jet flow plays a role in flushing cuttings at the position of the edge groove 3 with enough pressure.
Taking a double-helix drill bit 2 as an example, two cooling channels 6 are correspondingly arranged, the two cooling channels 6 of the drill bit 2 are symmetrically arranged in the main body of the drill bit 2 close to the cutting edge of the cutting edge on the side surface, a jet hole is positioned in the cutting edge groove 3, one axial end of the jet hole is communicated with the cooling channels 6, and the other axial end of the jet hole extends to the cutting edge groove 3; jet holes are arranged in each edge groove 3, and a plurality of jet holes are sequentially arranged at intervals along the extending direction of the edge groove 3.
It will be appreciated that the number of jet holes at the flute 3 is adjusted according to the number of land cutting tips on the sidewall and the pitch as shown in fig. 1, and the straight hole pitch may be configured to be equal to the pitch of the flute 3.
As shown in figure 2, a plurality of cooling channels 6 are arranged in the head, the cooling channels 6 are arranged in one-to-one correspondence with the margins, the shape of the outer contour of each inner cooling channel is similar to the shapes of the cutting edges and the margins 3 of the drill bit 2, the track lines of the cooling channels 6 are arranged in parallel with the track lines of the margins, and the cross section shapes of the cooling channels 6 and the cross section shapes of the margins 3 of the drill bit 2 are similar graphs along the radial direction of the drill bit 2, so that the flow of cooling liquid can be reasonably distributed according to the positions of the cutting edges, and the cooling and lubricating effects are fully exerted.
As shown in FIG. 4, the distance a between the contour of the outer edge of the cooling channel 6 and the outer contour of the main body of the drill 2 and the cutting edge 3 is 0.3 times the radius of the drill 2 (i.e., R) 1 ) The distance between the circle center of the arc section of the inner edge of the cooling channel 6 and the center of the drill bit 2 is 0.3 time of the radius of the drill bit 2, the arc section of the inner edge of the cooling channel 6 is obtained by rounding two curve sections close to two sides of the cutting edge groove 3, and the radius value R of the arc section of the inner edge of the cooling channel is 2 About 0.12 times the radius of the drill bit 2.
The cooling channel 6 between the constriction 12 and the outlet 4 forms an expansion section 13 and the cooling channel 6 between the constriction 12 and the drill shank 1 of the drill bit 2 forms a transport section as a conventional section of an internal screw hole as shown in fig. 2; the drill handle 1 is used as a straight hole section of the drill bit 2; the cross-sectional area of the conveying section is larger than that of the expanding section 13 along the radial direction of the drill bit 2, and the contraction part 12 forms a contraction section.
Specifically, in the present embodiment, as shown in fig. 2 and 3, the cooling channel 6 of the drill bit 2 comprises three parts, namely a conventional section, a contraction section and an expansion section 13, wherein the total length of the contraction-expansion section 13 of the cooling channel 6 near the drill tip is 1/8 of the length of the main body of the drill bit 2, the ratio of the length of the contraction section to the length of the expansion section 13 of the cooling channel 6 is 2:1, and the ratio of the cross section of the conventional section of the cooling channel 6, the cross section of a contraction-expansion interface (i.e. a throat part) and the size of the cross section at the outlet 4 (i.e. the projection area of the drill tip outlet 4 of the cooling channel 6 in the axial direction of the drill bit 2) is 7:5: 6.
The contraction-expansion structure of the inner cooling channel close to the drill point of the drill bit 2 can improve the spraying speed of the cooling liquid at the outlet 4 of the drill bit 2 and the atomization degree of the cooling liquid, so as to fully exert the cooling and lubricating effects of the cooling channel 6; as shown in fig. 4, the outlet 4 is located on the rear face of the tip of the drill 2, and the outlets 4 are disposed on the rear faces on both sides of the axis of the drill 2.
The diameter of the jet hole at the position of the blade groove 3 is 0.05-0.1 times of the diameter of the main body part of the drill bit 2, so that the dual requirements of the integral strength of the drill bit 2 and the flow of the cooling liquid are met.
As shown in fig. 1, the selection range of the vertex angle α of the drill 2 is 120 ° to 140 °, the specific angle value can be determined according to the material property of the workpiece to be processed, and a larger vertex angle can be selected when the material strength is higher; when different vertex angle angles are selected, the distribution proportion of axial drilling force and radial drilling force in the drilling process can be changed, the stability of the machining process is enhanced, and the drill bit 2 is ensured to have enough rigidity and drilling stability.
In addition, in the embodiment, the spiral angle of the drill 2 is selected to be in the range of 20-40 degrees, the specific angle can be determined according to the material property of the workpiece to be machined, and a larger spiral angle can be properly selected when the high-viscosity hard-chip-breaking material is machined.
The drill bit 2 is integrally made of ultra-fine grain hard alloy, the TiAlN coating is coated on the surface of the drill bit, excellent cutter toughness, cutter high-temperature strength and wear resistance can be considered, difficult-to-machine materials can be efficiently drilled, and the machining quality and the service life of the drill bit 2 are ensured.
Surface roughness R of cutting edge 3 of drill 2 a The cutting edge is equal to 0.15, so that the friction between the chips and the surface of the cutting edge 3 and the bonding abrasion at the cutting edge 3 of the drill 2 are reduced, and the chips are smoothly discharged.
As shown in fig. 5 and 6, a straight hole is taken as a jet hole, the straight hole 7, the straight hole 8, the straight hole 9, the straight hole 10, the straight hole 11 and the outlet 4 are selected for flow and flow rate detection, and the drill bit 2 with the conventional cooling channel 6 is compared with the drill bit 2 in the embodiment, wherein the cross-sectional area of the cooling channel 6 of the conventional round-section inner cooling drill bit 2 is equal to that of the cooling channel 6 of the drill bit 2 in the embodiment.
Fig. 6 and 5 show the cooling fluid flow rates at the outlet 4 position of the jet hole and the drill point in the flute 3 in comparison with the cooling fluid flow rates at the jet holes of the drill bit 2 and the conventional round-section internal cooling channel drill bit 2 in the present embodiment under different cooling fluid inlet pressure conditions (20 bar and 30bar for example). The result shows that under the same inlet pressure condition, the flow rate of the cooling liquid of each jet hole and each outlet 4 in the embodiment is higher than that of the conventional circular-section inner-cooling drill bit 2, the flow rate of the cooling liquid is larger, and the flow rate of the cooling liquid can be improved by more than 30% at most.
Fig. 7 shows the flow rate distribution of the coolant at the cross section of each outlet 4 of the drill 2 and the conventional round-section cold drill 2 in this embodiment when the pressure of the inlet coolant is 20bar, and it can be seen that the flow rate of the coolant at the outlet 4 of the drill 2 in this embodiment is significantly higher than that of the conventional round-section cold drill 2 at the position of each coolant outlet 4, and the flow rate is highest in the area of the outer contour of the cooling channel 6 near the cutting edge.
By integrating the above results, the cooling channel 6 disposed in the drill bit 2 in the embodiment can bring better cooling effect to the machining process, and the cooling efficiency is higher, which will help to ensure the machining efficiency and surface quality of the drilling of the deep hole difficult-to-machine structure and the difficult-to-machine material.
Compared with the prior art, the drill bit 2 of the embodiment is provided with the conformal cooling channel 6 and the straight holes at the cutting edge grooves 3, high-pressure cooling liquid can respectively reach the drill point and the cutting edge grooves 3, a good cooling and lubricating effect is achieved on a drilling area, and meanwhile chips accumulated at the drill point and the cutting edge grooves 3 can be timely discharged, so that the abrasion of the drill bit 2 is favorably reduced.
The cross-sectional shape of the cooling channel 6 of the drill bit 2 is of a conformal special-shaped structure, the outline of the inner cooling channel is similar to the outlines of the cutting edge and the cutting edge groove 3 of the drill bit 2, the cooling effect of the cooling liquid on the cutting edge and the drill tip of the drill bit 2 can be improved, and better and reasonable cooling liquid flow distribution can be realized.
The drill bit 2 of the embodiment has the advantages of simple structure, convenient use, lower production and manufacturing cost of the drill bit 2, and contribution to large-scale popularization and application. Meanwhile, the cooling channel 6, the straight hole channel 5 and the jet hole structure provided in the embodiment can also be applied to the integral drill bit 2 and the replaceable drill bit 2 such as a crown drill, a shovel drill and the like, and can be expanded and applied to other cutter structures for rotary machining.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A cutter with an internal cooling jet structure is characterized by comprising a drill bit, wherein a spiral cooling channel is arranged in the drill bit, and one end of the cooling channel extends to the drill point of the drill bit to be used as an outlet; the cooling channel is communicated with the outside through a jet hole preset in the side face of the drill bit, a contraction part is arranged in the cooling channel close to the outlet, and the radial sectional area of the contraction part is smaller than the radial sectional areas of other areas of the cooling channel, so that cooling liquid is atomized at the outlet.
2. The tool with an internal cooling jet structure as set forth in claim 1, wherein said cooling passage has a trajectory identical to the land trajectory of the bit, the cooling passage being spaced from the bit side.
3. The tool with an internally cooled fluidic structure as set forth in claim 2, wherein said cooling channel path is arranged parallel to the land path, and the cooling channel has a cross-sectional shape similar to the cross-sectional shape of the drill flutes in the radial direction of the drill.
4. The tool with the internally cooled fluidic structure of claim 1, wherein said fluidic orifice is located in the flute, the fluidic orifice communicating axially at one end with the cooling channel and extending axially at the other end to the flute.
5. The tool with the internally cooled jet structure according to claim 1 or 4, wherein a jet hole is provided in each of the flutes, and a plurality of jet holes are arranged at intervals in sequence in the extending direction of the flutes.
6. The tool with the internally cooled fluidic structure of claim 1, wherein a plurality of cooling channels are provided in said drill bit, said cooling channels being arranged in a one-to-one correspondence with said lands.
7. The tool with the internally cooled fluidic structure of claim 1, wherein the cooling channel between the converging portion and the outlet forms an expanding section and the cooling channel between the converging portion and the drill shank forms a conveying section; the cross-sectional area of the conveying section is larger than that of the expanding section along the radial direction of the drill bit.
8. The tool with internal cold jet configuration of claim 7, wherein said outlets are located on the rear face of the drill tip of the drill, and outlets are located on the rear face on both sides of the axis of the drill.
9. The tool with the internally cooled fluidic structure as claimed in claim 1, wherein said drill bit shank has a straight bore channel therein, one end of the straight bore channel being in abutting communication with the end of the spiral channel remote from the outlet, the other end of the straight bore channel extending to the end of the drill bit shank as the inlet.
10. The tool with internal cooling fluidic structure of claim 9, wherein said straight bore passages communicate with said helical passages in a one-to-one correspondence, and a plurality of straight bore passages are spaced around the bit axis.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210698598.0A CN114932253B (en) | 2022-06-20 | 2022-06-20 | Cutter with internal cooling jet structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210698598.0A CN114932253B (en) | 2022-06-20 | 2022-06-20 | Cutter with internal cooling jet structure |
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| CN114932253A true CN114932253A (en) | 2022-08-23 |
| CN114932253B CN114932253B (en) | 2024-06-18 |
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| JP2001334409A (en) * | 2000-05-30 | 2001-12-04 | Osg Corp | Rotating tool with fluid supply passage |
| CN201020545Y (en) * | 2006-05-08 | 2008-02-13 | 沈强 | Internal cooling knife with atomized jet |
| CN101524769A (en) * | 2009-04-20 | 2009-09-09 | 刘新平 | Inner-cooling indexable step drill and method for fabricating step hole |
| CN102581356A (en) * | 2012-03-21 | 2012-07-18 | 锑玛(苏州)精密工具有限公司 | Internal cold drill |
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| CN105033291A (en) * | 2014-04-17 | 2015-11-11 | 钴碳化钨硬质合金公司 | Cutting tool and method for producing a cutting tool |
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| RU198358U1 (en) * | 2020-02-03 | 2020-07-02 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Саратовский государственный технический университет имени Гагарина Ю.А." (СГТУ имени Гагарина Ю.А.) | Drilling tool |
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| CN114932253B (en) | 2024-06-18 |
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