CN111036951A - Skin deep hole machining method with active cooling channel - Google Patents
Skin deep hole machining method with active cooling channel Download PDFInfo
- Publication number
- CN111036951A CN111036951A CN201911358933.7A CN201911358933A CN111036951A CN 111036951 A CN111036951 A CN 111036951A CN 201911358933 A CN201911358933 A CN 201911358933A CN 111036951 A CN111036951 A CN 111036951A
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- China
- Prior art keywords
- skin
- deep hole
- drill
- deep
- cooling channel
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
- B23B35/00—Methods for boring or drilling, or for working essentially requiring the use of boring or drilling machines; Use of auxiliary equipment in connection with such methods
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B49/00—Measuring or gauging equipment on boring machines for positioning or guiding the drill; Devices for indicating failure of drills during boring; Centering devices for holes to be bored
- B23B49/02—Boring templates or bushings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
- B23Q11/10—Arrangements for cooling or lubricating tools or work
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Drilling And Boring (AREA)
Abstract
The invention relates to the technical field of machining, and discloses a skin deep hole machining method with an active cooling channel, which comprises the following steps: s1: marking on the surface of a skin to be processed by adopting a machine tool, determining the upper line of the deep hole and the deflection amount of a side bus and aligning so as to ensure the deflection precision of the deep hole; s2: according to the position of the upper line and the side bus on the rear skin aligned in the step S1, a gun drill is adopted to process the front half section of the deep hole to be processed along one end of the skin, and the skin is kept fixed and the gun drill is kept rotating in the processing process; s3: processing the rear half section of the deep hole from the opposite side by adopting the same deep hole processing mode as that in the step S2 until the front half section is communicated with the rear half section, and finishing the deep hole processing of the skin; s4: performing thermoforming treatment on the skin obtained in the step S3; the invention reduces the drilling difficulty of the skin deep hole with larger major diameter and can ensure the position precision and the size precision of the skin deep hole.
Description
Technical Field
The invention belongs to the technical field of machining, and particularly relates to a skin deep hole machining method with an active cooling channel.
Background
The large-size arc-shaped skin is provided with longitudinal ribs and transverse ribs, deep holes which are distributed side by side are formed in the longitudinal ribs and two longitudinal edges of the skin, the length-diameter ratio of each deep hole is close to 160, the hole diameter is small, the length is long, the deep holes are difficult to process, and the deep holes are difficult to dissipate heat in the machining process, so that the temperature of a cutter and the temperature of the skin are too high. In addition, the diameter is small, the length is long, the processing precision is not high, but the requirement on the dimensional precision of the deep hole is high, and the design requirement that the steel ball with the diameter of 9.5mm can smoothly pass through the steel ball with the wall thickness of more than 2mm around the deep hole is met.
Disclosure of Invention
The technical problem solved by the invention is as follows: the skin deep hole machining method with the active cooling channel is provided, the deep hole with the length-diameter ratio close to 160 can be machined, and the position and size precision of the deep hole can be effectively guaranteed. The method is applied to large-size 5A06 aluminum alloy skins.
The technical solution of the invention is as follows: a skin deep hole machining method with an active cooling channel comprises the following steps:
s1: marking on the surface of a skin to be processed by adopting a machine tool, determining the upper line of the deep hole and the deflection amount of a side bus and aligning so as to ensure the deflection precision of the deep hole;
s2: according to the position of the upper line and the side bus on the rear skin aligned in the step S1, a gun drill is adopted to process the front half section of the deep hole to be processed along the skin, and the skin is kept fixed and the gun drill is kept rotating in the processing process;
s3: processing the rear half section of the deep hole from the opposite side by adopting the same deep hole processing mode as that in the step S2 until the front half section is communicated with the rear half section, and finishing the deep hole processing of the skin;
s4: the skin obtained in step S3 is subjected to a thermoforming process.
The invention adopts a drilling mode of drilling holes from two sides in sections aiming at the skin deep hole with a larger long diameter, reduces the drilling difficulty, and marks and aligns the drilling position of the skin deep hole before drilling so as to ensure the position precision and the size precision of the skin deep hole.
Further, in step S1, before marking, the surface with high precision requirement is milled flat by a machine tool to ensure the marking precision, thereby ensuring the machining precision of the skin deep hole.
Further, in step S2, before the drill of the gun drill contacts the skin, a cutting fluid is introduced into the skin, and the gun drill and the skin are cooled and lubricated by the cutting fluid.
Further, in step S2, when the gun drill is used to machine a deep hole, the drill is guided by the drill bushing to ensure machining along the axis of the deep hole, so as to ensure the machining accuracy of the deep hole, and chips are discharged from the machined hole along the gun drill chip groove.
Further, in step S2, the drill point of the drill bit of the drill gun is staggered by about 1/4 of the drill diameter relative to the axial lead, and the drill point angle is 120 ° -140 °, so as to ensure smoother cutting, reduce the vibration of the tool bit, and facilitate chip removal.
Further, in step S2, the cutting fluid is oil dedicated for gun drilling, the flow rate of the cutting fluid is 280-320L/min, the pressure is 3-4MPa, and the method is suitable for machining deep holes with small hole diameters, and can effectively solve the problems of lubrication of the skin and cooling of the drilling tool.
Further, in step S3, the drill rotation speed of the gun drill is 2500r/min, the feed speed is 12mm/min, and the deep hole processing precision can reach the highest, so that the gun drill speed is not too high to cause deviation of the deep hole drilling.
Further, in step S4, the upper die pressing speed of the thermoforming machine was 0.5mm/S during thermoforming. So as to ensure the precision of hot-press molding of the product.
Compared with the prior art, the invention has the advantages that:
1. the invention adopts a drilling mode of drilling holes from two sides in a segmented manner aiming at the skin deep hole with a larger major diameter, thereby reducing the difficulty of drilling holes.
2. The method marks and aligns the punching position of the skin deep hole before drilling, ensures that the sectional punching can be communicated, and can ensure the position precision and the size precision of the skin deep hole.
3. By adopting the processing method, the deviation precision of the drilling holes of the two sections can be within 0.3mm, and the requirement of the design index that the deviation in each direction is within 0.5mm can be met.
Drawings
FIG. 1 is a schematic view of the gun drill bit of the present invention.
Fig. 2 is a schematic view of deep hole processing of the skin of the present invention.
FIG. 3 is a schematic view of the skin thermoforming of the present invention.
Reference numerals: 1-covering, 1a covering with holes, 2-drilling bit, 3-gun drill rod, 4-drilling sleeve, 5-cutting fluid channel, 6-drilling handle, 7-chip groove, 11-upper die and 12-lower die.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
the product to be processed is a large-size arc-shaped skin, the processing method is suitable for processing a deep hole with a larger length-diameter ratio, namely the length-diameter ratio is close to 160, the deep hole is a through hole, and the processed deep hole is used as a cooling channel.
Taking the 5A06 aluminum alloy arc plate with the skin wall thickness of 2.5mm, the arc diameter of 606mm, the arc angle of 122 degrees and the length of 1658mm as an example, the skin is provided with 3 longitudinal ribs with the width of 18mm and the height of 22.5mm and 7 transverse ribs with the width of 3mm and the height of 22.5 mm. 3 longitudinal ribs and 2 longitudinal edges of the skin are provided with 5 through holes which are distributed side by side and have the diameter of 10mm and the depth of 1586mm, and the length-diameter ratio is close to 160. The processing precision requirement of the through hole is to meet the design requirement that the wall thickness around the deep hole is more than 2mm and the steel ball with the diameter of 9.5mm can smoothly pass through the through hole.
The invention relates to a skin deep hole processing method containing an active cooling channel, which comprises the following steps:
s1: marking on the surface of a skin 1 to be processed by adopting a machine tool, determining the upper line of the deep hole and the deflection amount of a side bus and aligning so as to ensure the deflection precision of the deep hole; specifically, the skin surface is required to be parallel to the upper line and the side generatrix.
The step is preferred, and before the mark is marked, the surface with higher requirement on precision is milled flat through a machine tool to ensure the marking precision and further ensure the processing precision of the skin deep hole.
S2: according to the step S1, the positions of the upper line and the side generatrix on the rear skin 1 are aligned, a gun drill is adopted to process the front half section of the deep hole to be processed along the skin, the skin is kept fixed and the gun drill rotates in the processing process, and the processing schematic diagram of the skin deep hole is shown in figure 2;
specifically, as shown in fig. 2, the gun drill comprises a drill bit 2, a gun drill rod 3 and a drill shank 6 which are connected in sequence, a chip discharge groove 7 is formed in the outer surface of the drill shank 6 along the generatrix thereof, and a through cutting fluid channel 5 is formed in the drill shank 6 along the axial direction thereof. Preferably, the drill bit 2 should be selected with a proper geometric angle, the structure of the drill bit 2 is as shown in fig. 1, the drill tip of the drill gun drill bit is staggered from the axial lead by about 1/4 of the diameter of the drill bit, and the vertex angle of the drill bit is 120-140 degrees to ensure smoother cutting, reduce the vibration of the tool bit and facilitate chip removal.
Preferably, the rotating speed of the drill bit of the gun drill is controlled to be about 2500r/min, and the feeding speed is controlled to be about 12mm/min, so that the precision of deep hole machining can be highest.
Before a drill bit of the gun drill contacts the skin, cutting fluid needs to be introduced into the skin, the gun drill and the skin are cooled and lubricated by the cutting fluid, specifically, the cutting fluid enters from an oil inlet hole of the gun drill and reaches the inside of the skin, and the drill bit keeps a certain rotating speed and a certain feeding speed while the cutting fluid is introduced.
Preferably, the cutting fluid adopts special oil for gun drilling, and reaches the cutting part of the drill bit through the drill handle of the gun drilling and the hole in the drill rod; for the processing of deep holes with small hole diameters, the flow rate and the pressure of the cutting fluid are kept low, so that the flow rate of the cutting fluid is controlled between 280 and 320L/min, and the pressure is controlled between 3 and 4MPa, and the problems of skin lubrication and drilling tool cooling can be effectively solved.
Preferably, when the gun drill is used for processing a deep hole, the drill is guided into the drill through the drill bushing so as to ensure the processing along the axis of the deep hole, thereby ensuring the processing precision of the deep hole, and chips generated in the deep hole are discharged from the processed deep hole along a chip groove of the gun drill while drilling.
S3: processing the rear half section of the deep hole from the opposite side by adopting the same deep hole processing mode as that in the step S2 until the front half section is communicated with the rear half section, and completing the deep hole processing of the skin to obtain the skin with the hole 1 a;
s4: and (3) performing thermoforming treatment on the skin obtained in the step (S3), wherein when the thermoforming machine is used for completing the thermoforming of the large-size arc-shaped skin with the deep hole, the thermoforming machine is provided with an upper die 11 and a lower die 12, the schematic diagram of thermoforming is shown in FIG. 3, the pressing speed of the upper die of the thermoforming machine is 0.5mm/S during thermoforming, and the diameter phi of the deep hole of the arc-shaped skin is 9.59mm according to the measurement result, so that the design index requirement is met.
The invention adopts a drilling mode of drilling holes from two sides in sections aiming at the skin deep hole with a larger major diameter, reduces the difficulty of drilling, and marks and aligns the drilling position of the skin deep hole before drilling so as to ensure the position precision and the size precision of the skin deep hole.
By adopting the processing method, the skin deep hole with the diameter of 10mm, the depth of 1586mm and the length-diameter ratio of 160 is accurately processed, the deviation precision of the drilling holes of two sections can be within 0.3mm, and the requirement of the design index that the deviation in each direction is within 0.5mm is met.
Those skilled in the art will appreciate that those matters not described in detail in the present specification are well known in the art.
Claims (8)
1. A skin deep hole machining method with an active cooling channel is characterized by comprising the following steps:
s1: marking on the surface of a skin to be processed by a machine tool, determining the upper line of a deep hole and the deflection amount of a side bus and aligning;
s2: according to the position of the upper line and the side bus on the rear skin aligned in the step S1, a gun drill is adopted to process the front half section of the deep hole to be processed along one end of the skin, and the skin is kept fixed and the gun drill is kept rotating in the processing process;
s3: processing the rear half section of the deep hole from the opposite side by adopting the same deep hole processing mode as that in the step S2 until the front half section is communicated with the rear half section, and finishing the deep hole processing of the skin;
s4: the skin obtained in step S3 is subjected to a thermoforming process.
2. The method for deep-hole machining of the skin with the active cooling channel according to claim 1, wherein the method comprises the following steps: in step S1, before marking, the surface with high precision requirement is milled flat by a machine tool.
3. The method for deep-hole machining of the skin with the active cooling channel according to claim 1, wherein the method comprises the following steps: in step S2, before the drill of the gun drill contacts the skin, the cutting fluid is introduced into the skin.
4. The method for deep-hole machining of the skin with the active cooling channel according to claim 2, wherein the method comprises the following steps: in step S2, the gun drill is guided to the drill through the drill bushing when the gun drill is used to process a deep hole.
5. The method for deep-hole machining of the skin with the active cooling channel according to claim 3 or 4, wherein the method comprises the following steps: in step S2, the drill point of the gun drill is staggered from the axial lead by about 1/4 of the drill diameter, and the drill point angle is 120-140 degrees.
6. The method for deep-hole machining of the skin with the active cooling channel according to claim 5, wherein the method comprises the following steps: in step S2, the cutting fluid is oil special for gun drilling, the flow rate of the cutting fluid is 280-320L/min, and the pressure is 3-4 MPa.
7. The method for deep-hole machining of the skin with the active cooling channel according to claim 6, wherein the method comprises the following steps: in step S2, the drill rotation speed of the gun drill is 2500r/min, and the feed speed is 12 mm/min.
8. The method for deep-hole machining of the skin with the active cooling channel according to claim 1, wherein the method comprises the following steps: in step S4, the upper die pressing speed of the thermoforming machine is 0.5mm/S during thermoforming.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911358933.7A CN111036951A (en) | 2019-12-25 | 2019-12-25 | Skin deep hole machining method with active cooling channel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911358933.7A CN111036951A (en) | 2019-12-25 | 2019-12-25 | Skin deep hole machining method with active cooling channel |
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| CN111036951A true CN111036951A (en) | 2020-04-21 |
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| CN201911358933.7A Pending CN111036951A (en) | 2019-12-25 | 2019-12-25 | Skin deep hole machining method with active cooling channel |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112676597A (en) * | 2020-12-17 | 2021-04-20 | 昆山利东精密工业有限公司 | Deep hole machining process for camera assembly |
| CN113001127A (en) * | 2021-04-29 | 2021-06-22 | 北京航星机器制造有限公司 | Method and device for machining skin with active cooling channel |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112676597A (en) * | 2020-12-17 | 2021-04-20 | 昆山利东精密工业有限公司 | Deep hole machining process for camera assembly |
| CN113001127A (en) * | 2021-04-29 | 2021-06-22 | 北京航星机器制造有限公司 | Method and device for machining skin with active cooling channel |
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Application publication date: 20200421 |
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| RJ01 | Rejection of invention patent application after publication |