CN108608044B - Forward-backward feeding spiral hole milling method for composite material and metal laminated structure - Google Patents
Forward-backward feeding spiral hole milling method for composite material and metal laminated structure Download PDFInfo
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- CN108608044B CN108608044B CN201810420280.XA CN201810420280A CN108608044B CN 108608044 B CN108608044 B CN 108608044B CN 201810420280 A CN201810420280 A CN 201810420280A CN 108608044 B CN108608044 B CN 108608044B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C3/00—Milling particular work; Special milling operations; Machines therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2215/00—Details of workpieces
- B23C2215/04—Aircraft components
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2220/00—Details of milling processes
- B23C2220/52—Orbital drilling, i.e. use of a milling cutter moved in a spiral path to produce a hole
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Abstract
The invention discloses a forward-backward feeding spiral hole milling method of a composite material and metal laminated structure, which is characterized by comprising the following steps of: s1, feeding the spiral hole milling cutter forward to mill the pre-machined hole until the rear end cutting area of the cutting part of the cutter extends out of the outlet side; and S2, adjusting the eccentricity of the cutter once or for multiple times, reversely feeding the spiral milling hole from the outlet side, milling a hole with the diameter D coaxial with the pre-processing hole to obtain a through hole to be processed, and finishing processing, wherein D is the diameter of the through hole to be processed. When the method is used for drilling composite materials and metal laminated structural members, the composite material layer is processed from the metal layer, so that the defects of layering, tearing and the like exceeding the processing requirement of the composite materials can be avoided, and the processing quality is improved; the composite material outlet side does not need to use an additional base plate, so that the cost is saved, the processing process is simplified, the production efficiency is improved, the design difficulty of the cutter is reduced, and the service life of the cutter is prolonged.
Description
Technical Field
The invention relates to the technical field of hole making and processing in aerospace craft assembly, in particular to a forward-backward feeding spiral hole milling method for a composite material and metal laminated structure.
Background
In the design of aerospace craft, a great deal of composite materials are used, and the problem of hole making of a composite material and metal laminated structure is often encountered in the process of aircraft assembly. Due to the complex structure of the aircraft, the limited operation space during the assembly and hole making, special design requirements and the like, in the hole making of some composite materials and metal laminated structures, a cutter must be cut into the composite material from the metal side and cut out from the composite material side. A common method for making holes is to use a drill to drill holes, and when using this method, a large axial cutting force is generated. Another new method of making holes is to use a special end mill to perform helical milling, which has a lower axial cutting force than the drilled hole but still exists. The composite material is usually formed by combining a plurality of layers of fibers, the resin matrix material with weaker strength is usually arranged between different fiber layers, axial force in the process is a main cause of processing damage of the composite material, when a cutter cuts out from one side of the composite material, the fiber layer near the outlet side is deformed under the action of axial cutting force of the cutter, the resin matrix between the different fiber layers is pulled apart, processing defects such as layering and tearing are formed, the quality of hole making is influenced, and the processing defects are formed at the outlet side of a drilled hole as shown in fig. 6, and the processing defects are formed at the outlet side of a spiral milled hole as shown in fig. 8. If a layer of backing plate is added at the rear end of the composite material, when a cutter cuts to the side close to the outlet of the composite material, the fiber layer close to the outlet side can be supported by the backing plate without large deformation, and the resin matrix between the fiber layers cannot be damaged, so that the processing defects of layering, tearing and the like are avoided, such as the situation that the backing plate is drilled in fig. 7, and the situation that the backing plate is drilled in a spiral hole milling mode in fig. 9. In actual production, however, a backing plate cannot be additionally arranged on the back surface of the composite material during hole making in some cases; although the base plate can be additionally installed in the hole making process under some conditions, the installation and the disassembly of the base plate greatly increase the production cost and reduce the production efficiency.
Therefore, for the laminated structure of the composite material and the metal which must be cut from the composite material side, how to realize the defect-free high-quality hole making without the backing plate is a technical problem which is urgently needed to be solved at present.
Disclosure of Invention
Aiming at the problems, the invention researches and designs a forward-backward feeding spiral hole milling method of a composite material and metal laminated structure, and solves the problems that the composite material outlet is easy to have the defects of layering, tearing and the like and the cushion plate is time-consuming and labor-consuming to install. The invention adopts the following technical means:
a forward-backward feeding spiral hole milling method for a composite material and metal laminated structure comprises the following steps:
s1, the cutter forwards feeds to mill a pre-processing hole in a spiral hole milling mode, the aperture of the pre-processing hole is D1, D1 is smaller than D, and D is the final aperture of the through hole to be processed until the rear end cutting area of the cutting part of the cutter extends out of the outlet side;
and S2, adjusting the eccentricity of the cutter once or for multiple times, and reversely feeding the cutter from the outlet side (the material of the outlet side is a composite material) to mill a through hole with the hole diameter D.
The step S1 includes the steps of:
s11, calculating the aperture D1 of the pre-processing hole;
s12, selecting a cutter;
s13, clamping the workpiece to be machined and the cutter;
and S14, adjusting the eccentricity of the cutter to e1 ═ D1-D)/2, wherein D is the diameter of the cutting part of the cutter, and driving the cutter to feed the spiral milling hole from the inlet side in the forward direction to mill a pre-machined hole with the diameter of D1 until the rear end cutting area of the cutting part of the cutter extends out of the outlet side.
The step S2 includes the steps of:
s21, if D-Di is less than D-D0, adjusting the eccentricity of the cutter to e-2, (D-D)/2, reversely feeding the spiral milling hole from the outlet side, milling a hole with the diameter D coaxial with the pre-processing hole to obtain a through hole to be processed, and finishing processing, wherein Di is the diameter of the outlet side after the previous spiral milling hole, D is the diameter of the cutting part of the cutter, D0 is the diameter of the neck part of the cutter, and i-1, 2, 3 and 4 … …;
if D-Di is larger than or equal to D-D0, adjusting the eccentricity of the cutter to e (i +1) to meet ei < e (i +1) < ei + (D-D0)/2, reversely feeding the spiral milling hole from the outlet side, milling a through hole coaxial with a pre-processing hole, adjusting the eccentricity of the cutter to e0< e (i +1), and forwardly feeding to enable the rear end cutting area of the cutting part of the cutter to extend out of the outlet side, wherein Di is the diameter of the outlet side after the previous spiral milling hole, D is the diameter of the cutting part of the cutter, D0 is the diameter of the neck of the cutter, ei is the diameter of the hole with Di generated on the outlet side, the eccentricity of the cutter, and e (i +1) is the current spiral milling hole, the eccentricity of the cutter, i is 1, 2, 3, 4 … …;
and S22, repeating the step S21.
In step S11, the calculation method of D1 is: according to the aperture D of the through hole to be machined, the radial unilateral maximum width K of the damaged area required by machining and the radial unilateral maximum width K1 of the damaged area generated by the spiral milling pre-machining hole determined by the previous experimental data and production experience, then D1 meets the requirements:
d1< D +2 xK-2 xK 1, and the specific value of D1 is determined according to actual conditions.
In step S12, the tool selection method includes: the cutter comprises a cutting part, a neck part and a handle part, wherein the cutting part comprises a front end cutting area, a circumference cutting area and a rear end cutting area, the diameter D of the cutting part meets D1/2< D < D1, the diameter D0 of the neck part meets D0< D, the length H of the neck part is greater than H, H is the hole depth of a through hole to be processed, and when the rear end cutting area of the cutting part of the cutter is positively fed to extend out of an outlet side, the handle part does not enter the hole.
The workpiece to be processed is of a laminated structure and comprises at least one layer of composite material and at least one layer of metal material.
The driving device of the cutter is a machining center or special spiral milling equipment with an automatic eccentricity adjusting function or other machining equipment capable of driving the cutter to realize the required movement.
In step S21, the method of feeding the spiral milled holes from the outlet side in the reverse direction includes: the cutter rotates at a high speed and simultaneously feeds to the outlet side along a spiral track, and the outlet side is subjected to spiral milling by utilizing the rear end cutting area of the cutting part of the cutter.
Compared with the prior art, the invention has the following beneficial effects:
1. the defects of layering, tearing and the like exceeding the processing requirements of the composite material can be avoided, and the processing quality is improved. In the spiral hole milling process, as the back surface of the composite material is not provided with the base plate, larger processing defects can be generated, but defective materials can be cut in the subsequent reverse feeding spiral hole milling process, and new processing defects can not be generated in the reverse feeding spiral hole milling process. This is because the axial force direction to which the composite material is subjected is changed during the reverse-feed helical milling process, and deformation which may cause delamination and tearing of the fiber layers is not generated. When the cutter reversely feeds the spiral milling hole to be close to the interface of the composite material and the metal layer, the metal layer can be used as a backing plate, so that the fiber layer of the composite material at the position does not have the defects of layering, tearing and the like.
2. The composite material outlet side does not need to use an additional base plate, so that the cost is saved, the processing process is simplified, and the production efficiency is improved.
3. The design difficulty of the cutter is reduced. When the forward feeding spiral milling is carried out on the cutting area at the front end of the cutter used by the invention, the machining defect within a certain scale is allowed to be generated, which is equivalent to reducing the design requirement of the edge shape of the cutting area at the front end of the cutter, and the usable cutter can be more easily obtained.
4. The service life of the cutter is prolonged. When the forward-feed spiral milling hole is milled by using the front end cutting area, the machining defects within a certain scale are allowed to be generated, so that the front end cutting area can be continuously used even if the machining quality is reduced after the cutting edge of the front end cutting area is abraded to a certain extent until the generated machining defects exceed the allowable value of the invention. When the reverse feeding spiral milling hole of the rear end cutting area is used, the metal layer can be used as a backing plate, so that even if a certain degree of abrasion is generated, the processing defect can not be generated on one side of the composite material, which is close to the metal.
Based on the reasons, the invention can be widely popularized in the fields of hole-making processing technology and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a flow chart of a forward-backward feed helical milling method for a composite material and metal laminate structure according to an embodiment of the present invention.
Fig. 2 is a schematic view of the structure of a cutter in the embodiment of the present invention.
Fig. 3 is a schematic view of a cutter feeding forward from an inlet side to screw mill a prepared hole in an embodiment of the present invention.
FIG. 4 is a schematic diagram of the eccentric adjustment of the cutter according to the embodiment of the present invention.
Fig. 5 is a schematic view of the reverse feed of the cutter from the outlet side for helical milling of holes in the embodiment of the present invention.
Fig. 6 is a schematic diagram illustrating the principle of forming processing damage on the exit side of a composite material by a conventional drilling method in the background art of the present invention.
Fig. 7 is a schematic diagram illustrating a principle of suppressing processing damage when a backing plate is provided on an outlet side of a composite material in a conventional drilling processing method in the background art of the present invention.
Fig. 8 is a schematic diagram illustrating a principle of forming machining damage on an outlet side of a composite material in a conventional spiral hole milling method in the background art of the present invention.
Fig. 9 is a schematic diagram illustrating a principle of suppressing processing damage when a shim plate is provided on an outlet side of a composite material in a conventional spiral hole milling processing method in the background art of the present invention.
FIG. 10 is a graph comparing the exit quality of the final hole obtained by forward-reverse feed helical milling of a composite and metal laminate using the method of the present invention with the exit quality of a pre-machined hole obtained by first forward-feed helical milling from the entrance side.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A forward-backward feeding spiral hole milling method for a composite material and metal laminated structure is suitable for machining composite materials, metals and laminated material structures. The directional terms used herein, such as up, down, left, right, etc., are used with reference to the orientation of the drawings, and thus, are used for purposes of illustration and are not intended to limit the present invention.
The invention is suitable for processing the laminated structure of the composite material and the metal, and is also suitable for drilling single-layer composite materials, composite material laminates, single-layer metals and metal laminated materials so as to avoid the processing defects of flash, burr and the like on the outlet side.
The composite material mentioned in the invention mainly refers to carbon fiber reinforced resin matrix composite material, but also includes other composite materials with different fibers and matrix materials, and the metal material mainly includes but is not limited to titanium alloy, aluminum alloy, high-strength steel and other metal materials.
The processing defects mentioned in the present invention include, but are not limited to, delamination and tearing processing defects. The invention is also applicable to other defects caused by no backing plate support at the outlet side or other processing defects with the same characteristics as delamination and tearing but different names.
If holes of the type such as pre-drilled holes, small holes, guide holes, blind holes, inclined holes, defective holes and the like with the diameter smaller than that of the through hole to be processed exist on the workpiece, the hole can be processed and manufactured according to the steps of the method of the invention on the basis of not considering the holes.
If a small through hole is formed in the workpiece, the cutting part of the cutter is allowed to extend out, and the length of the neck part of the cutter is larger than the depth of the through hole to be processed, the reverse reaming can be directly carried out by using the method of the invention under the condition.
The method comprises the following steps:
s1, the cutter forwards feeds to mill a pre-processing hole in a spiral hole milling mode, the aperture of the pre-processing hole is D1, D1 is smaller than D, and D is the final aperture of the through hole to be processed until the rear end cutting area of the cutting part of the cutter extends out of the outlet side;
and S2, adjusting the eccentricity of the cutter once or for multiple times, and milling a through hole with the diameter of D by reversely feeding the spiral milling hole from the outlet side.
The step S1 includes the steps of:
s11, calculating the aperture D1 of the pre-processing hole;
s12, selecting a cutter;
s13, clamping the workpiece to be machined and the cutter;
and S14, adjusting the eccentricity of the cutter to e1 ═ D1-D)/2, wherein D is the diameter of the cutting part of the cutter, and driving the cutter to feed the spiral milling hole from the inlet side in the forward direction to mill a pre-machined hole with the diameter of D1 until the rear end cutting area of the cutting part of the cutter extends out of the outlet side.
The step S2 includes the steps of:
s21, if D-Di is less than D-D0, adjusting the eccentricity of the cutter to e-2, (D-D)/2, reversely milling a spiral milling hole from an outlet side, milling a hole with the diameter D coaxial with a pre-processing hole to obtain a through hole to be processed, and finishing processing, wherein Di is the diameter of the outlet side after the previous spiral milling hole, D is the diameter of a cutting part of the cutter, D0 is the diameter of a neck part of the cutter, and i-1, 2, 3 and 4 … …;
if D-Di is larger than or equal to D-D0, adjusting the eccentricity of the cutter to e (i +1) to meet ei < e (i +1) < ei + (D-D0)/2, reversely feeding the spiral milling hole from the outlet side, milling a through hole coaxial with a pre-processing hole, adjusting the eccentricity of the cutter to e0< e (i +1), and forwardly feeding to enable the rear end cutting area of the cutting part of the cutter to extend out of the outlet side, wherein Di is the diameter of the outlet side after the previous spiral milling hole, D is the diameter of the cutting part of the cutter, D0 is the diameter of the neck of the cutter, ei is the diameter of the hole with Di generated on the outlet side, the eccentricity of the cutter, and e (i +1) is the current spiral milling hole, the eccentricity of the cutter, i is 1, 2, 3, 4 … …;
and S22, repeating the step S21.
In step S11, the calculation method of D1 is: according to the aperture D of the through hole to be machined, the radial unilateral maximum width K of the damaged area required by machining and the radial unilateral maximum width K1 of the damaged area generated by the spiral milling pre-machining hole determined by the previous experimental data and production experience, then D1 meets the requirements:
d1< D +2 xK-2 xK 1, and the specific value of D1 is determined according to actual conditions.
In step S12, the tool selection method includes: the cutter comprises a cutting part, a neck part and a handle part, wherein the cutting part comprises a front end cutting area, a circumference cutting area and a rear end cutting area, the diameter D of the cutting part meets D1/2< D < D1, the diameter D0 of the neck part meets D0< D, the length H of the neck part is greater than H, H is the hole depth of a through hole to be processed, and when the rear end cutting area of the cutting part of the cutter is positively fed to extend out of an outlet side, the handle part does not enter the hole.
The workpiece to be processed is of a laminated structure and comprises at least one layer of composite material and at least one layer of metal material.
The driving device of the cutter is a machining center or special spiral milling equipment with an automatic eccentricity adjusting function or other machining equipment capable of driving the cutter to realize the required movement.
In step S21, the method of feeding the spiral milled holes from the outlet side in the reverse direction includes: the cutter rotates at a high speed and simultaneously feeds to the outlet side along a spiral track, and the outlet side is subjected to spiral milling by utilizing the rear end cutting area of the cutting part of the cutter.
If holes of the type such as pre-drilled holes, small holes, guide holes, blind holes, inclined holes, defective holes and the like with the diameter smaller than that of the through hole to be processed exist on the workpiece, the hole can be processed and manufactured according to the steps of the method of the invention on the basis of not considering the holes.
If a small through hole is formed in the workpiece, the cutting part of the cutter is allowed to extend out, and the length of the neck part of the cutter is larger than the depth of the through hole to be processed, the reverse reaming can be directly carried out by using the method of the invention under the condition.
The invention can also be used for making holes in metal materials to avoid the generation of flash and burr on the outlet side.
Example 1
Fig. 1-5 show a forward-backward feeding spiral hole milling method for a composite material and metal laminated structure, and fig. 10 shows a comparison graph of the outlet quality of a final hole obtained by forward-backward feeding spiral hole milling of a composite material and metal laminated structure by using the method of the present invention and the outlet quality of a pre-processed hole obtained by forward feeding spiral hole milling from the inlet side for the first time. The hole diameter D of a through hole to be machined is 14mm, the thickness H of a workpiece to be machined is 20mm, and the radial unilateral maximum width K of a damage area required by machining is 0, wherein the method comprises the following steps:
s1, the cutter 9 is fed forward to mill the pre-machined hole in a spiral hole milling manner until the rear cutting area of the cutting part 1 of the cutter 9 extends out of the outlet side, and the specific steps are as follows:
s11, calculating the aperture D1 of the pre-processing hole:
according to the aperture D of the through hole to be machined being 14mm, the radial unilateral maximum width K of the damaged area required by machining is 0 and the radial unilateral maximum width K1 of the damaged area generated by the spiral milling pre-machining hole determined by previous experimental data and production experience is 0.5mm, then D1 satisfies:
d1< D +2 xK-2 xK 1, wherein the specific numerical value of D1 is determined according to actual conditions, and D1 is 12 mm;
s12, selecting a cutter 9:
the tool 9 comprises a cutting part 1, a neck part 2 and a shank part 3, wherein the cutting part 1 comprises a front end cutting area 6, a circumference cutting area 5 and a rear end cutting area 4, the diameter D of the cutting part 1 meets D1/2< D < D1, D is 8mm, the diameter D0 of the neck part 2 meets D0< D, D0 is 7mm, the length H of the neck part 2 is H, H is 30mm, and when the rear end cutting area 4 of the cutting part 1 which is fed forward to the tool 9 extends out of an outlet side, the shank part 3 does not enter a hole;
s13, clamping a workpiece to be machined and the cutter 9, wherein the workpiece to be machined is of a laminated structure and comprises a layer of composite material 7 and a layer of metal material 8, and the cutter 9 is clamped on a device capable of rotating and revolving with a certain eccentric amount, so that the axis of the cutter 9 is parallel to the axis of the through hole to be machined;
and S14, adjusting the eccentricity of the cutter 9 to e1 ═ D1-D)/2 ═ 2mm, driving the cutter 9 to feed the spiral milling hole from the inlet side in the forward direction, milling a pre-processing hole with the hole diameter of D1 until the rear end cutting area 4 of the cutting part 1 of the cutter 9 extends out of the outlet side, and the driving device is a machining center, a spiral milling special device with an automatic eccentricity adjusting function or other machining equipment capable of driving the cutter 9 to realize the required movement of the invention.
S2, milling a through hole with a diameter of D by reversely feeding the spiral milling hole from the outlet side, and the method comprises the following specific steps:
s21, D-D1 is 2mm, D-D0 is 1mm, D-D1 is equal to or larger than D-D0, the eccentricity of the tool 9 is adjusted to e (1+1) ═ 2.4mm, e1< e (1+1) < e1+ (D-D0)/2, the spiral milling hole is fed reversely from the outlet side, a through hole coaxial with the pre-machined hole is milled, the tool 9 is fed to the outlet side along the spiral track while rotating at high speed, the outlet side is spirally milled by using the rear end cutting area 4 of the cutting part 1 of the tool 9, the eccentricity of the tool 9 is adjusted to e0 ═ 2.3mm < e (1+1), and the forward feeding is performed, so that the rear end cutting area 4 of the cutting part 1 of the tool 9 extends out of the outlet side;
s22, D-D2 is 1.2mm, D-D0 is 1mm, D-D2 is equal to or greater than D-D0, the eccentricity of the tool 9 is adjusted to e (2+1) ═ 2.7mm, e2< e (2+1) < e2+ (D-D0)/2, the spiral milling is reversely fed from the outlet side, a through hole coaxial with the pre-machined hole is milled, the tool 9 is fed to the outlet side along the spiral track while rotating at a high speed, the spiral milling is performed by using the rear end cutting area 4 of the cutting part 1 of the tool 9, the eccentricity of the tool 9 is adjusted to e0 ═ 2.3mm < e (2+1), the forward feeding is performed, the rear end cutting area 4 of the cutting part 1 of the tool 9 is extended out of the outlet side, and D2 is the aperture of the outlet side obtained in step S21;
s23, D-D3 is 0.6mm, D-D0 is 1mm, D-D3< D-D0, the eccentricity of the tool 9 is adjusted to e (D-D)/2 is 3mm, a helical milling hole is reversely fed from the outlet side, a hole with a diameter D coaxial with the pre-machining hole is milled to obtain a through hole to be machined, and D3 is the diameter of the outlet side obtained in step S22 after machining.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (5)
1. A forward-backward feeding spiral hole milling method for a composite material and metal laminated structure is characterized by comprising the following steps:
s1, feeding the cutter forward to spirally mill a pre-processing hole, wherein the aperture of the pre-processing hole is D1, D1 is smaller than D, and D is the final aperture of the through hole to be processed until the rear end cutting area of the cutting part of the cutter extends out of the outlet side;
s2, adjusting the eccentricity of the cutter once or for many times, reversely feeding the spiral milling hole from the outlet side, and milling a through hole with the diameter of D;
the step S1 includes the steps of:
s11, calculating the aperture D1 of the pre-processing hole;
s12, selecting a cutter;
s13, clamping the workpiece to be machined and the cutter;
s14, adjusting the eccentricity of the cutter to e1 ═ D1-D)/2, wherein D is the diameter of the cutting part of the cutter, driving the cutter to feed the spiral milling hole from the inlet side in a forward direction, and milling a pre-machining hole with the diameter of D1 until the rear end cutting area of the cutting part of the cutter extends out of the outlet side;
in step S11, the calculation method of D1 is: according to the aperture D of the through hole to be machined, the radial unilateral maximum width K of the damaged area required by machining and the radial unilateral maximum width K1 of the damaged area generated by the spiral milling pre-machining hole determined by the previous experimental data and production experience, then D1 meets the requirements:
d1< D +2 xK-2 xK 1, wherein the specific numerical value of D1 is determined according to actual conditions;
the step S2 includes the steps of:
s21, if D-Di is less than D-D0, adjusting the eccentricity of the cutter to e-2, (D-D)/2, reversely feeding the spiral milling hole from the outlet side, milling a hole with the diameter D coaxial with the pre-processing hole to obtain a through hole to be processed, and finishing processing, wherein Di is the diameter of the outlet side after the previous spiral milling hole, D is the diameter of the cutting part of the cutter, D0 is the diameter of the neck part of the cutter, and i-1, 2, 3 and 4 … …;
if D-Di is larger than or equal to D-D0, adjusting the eccentricity of the cutter to e (i +1) to meet ei < e (i +1) < ei + (D-D0)/2, reversely feeding the spiral milling hole from the outlet side, milling a through hole coaxial with a pre-processing hole, adjusting the eccentricity of the cutter to e0< e (i +1), and forwardly feeding to enable the rear end cutting area of the cutting part of the cutter to extend out of the outlet side, wherein Di is the diameter of the outlet side after the previous spiral milling hole, D is the diameter of the cutting part of the cutter, D0 is the diameter of the neck of the cutter, ei is the diameter of the hole with Di generated on the outlet side, the eccentricity of the cutter, and e (i +1) is the current spiral milling hole, the eccentricity of the cutter, i is 1, 2, 3, 4 … …;
and S22, repeating the step S21.
2. The forward-backward feed helical milling method for composite and metal laminate structures according to claim 1, wherein:
in step S12, the tool selection method includes: the cutter comprises a cutting part, a neck part and a handle part, wherein the cutting part comprises a front end cutting area, a circumference cutting area and a rear end cutting area, the diameter D of the cutting part meets D1/2< D < D1, the diameter D0 of the neck part meets D0< D, the length H of the neck part is greater than H, H is the hole depth of a through hole to be processed, and when the rear end cutting area of the cutting part of the cutter is positively fed to extend out of an outlet side, the handle part does not enter the hole.
3. The forward-backward feed helical milling method for composite and metal laminate structures according to claim 1, wherein: the workpiece to be processed is of a laminated structure and comprises at least one layer of composite material and at least one layer of metal material.
4. The forward-backward feed helical milling method for the laminated structure of the composite material and the metal as claimed in claim 1, wherein: the driving device of the cutter is a machining center or special spiral milling equipment with an automatic eccentricity adjusting function or other machining equipment capable of driving the cutter to realize required movement.
5. The forward-backward feed helical milling method for composite and metal laminate structures according to claim 1, wherein:
in step S21, the method of feeding the spiral milled holes from the outlet side in the reverse direction includes: the cutter rotates at a high speed and simultaneously feeds to the outlet side along a spiral track, and the outlet side is subjected to spiral milling by utilizing the rear end cutting area of the cutting part of the cutter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810420280.XA CN108608044B (en) | 2018-05-04 | 2018-05-04 | Forward-backward feeding spiral hole milling method for composite material and metal laminated structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810420280.XA CN108608044B (en) | 2018-05-04 | 2018-05-04 | Forward-backward feeding spiral hole milling method for composite material and metal laminated structure |
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| Publication Number | Publication Date |
|---|---|
| CN108608044A CN108608044A (en) | 2018-10-02 |
| CN108608044B true CN108608044B (en) | 2020-04-14 |
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| CN111390251B (en) * | 2020-04-17 | 2021-08-06 | 哈尔滨创沃铭机电科技有限公司 | Inclination angle eccentric integrated precise hole milling device and hole milling method |
| CN111390253B (en) * | 2020-04-26 | 2021-02-09 | 兰州理工大学 | Laminated material hole-making machining trajectory planning method |
| CN112317822B (en) * | 2020-09-24 | 2022-06-14 | 成都飞机工业（集团）有限责任公司 | Method for machining small-diameter high-precision hole |
| CN113649632B (en) * | 2021-08-23 | 2023-10-13 | 哈尔滨理工大学 | Ultrasonic bidirectional spiral milling cutter made of carbon fiber composite material and grinding method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1994017944A1 (en) * | 1993-02-05 | 1994-08-18 | Ab Strukturteknologier I Stockholm | HAND TOOL FOR MAKING HOLES IN e.g. FIBRE-REINFORCED COMPOSITES, BY MEANS OF AN ORBITALLY MOVING CUTTER |
| CN101537512A (en) * | 2009-04-17 | 2009-09-23 | 天津大学 | Method for helically milling hole and device thereof |
| CN105728811A (en) * | 2016-04-20 | 2016-07-06 | 南京信息职业技术学院 | Robotized spiral drilling method and system for laminated structure of airframe |
| CN106077774A (en) * | 2016-07-07 | 2016-11-09 | 大连理工大学 | A kind of ultrasonic helical milling device and processing method |
-
2018
- 2018-05-04 CN CN201810420280.XA patent/CN108608044B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1994017944A1 (en) * | 1993-02-05 | 1994-08-18 | Ab Strukturteknologier I Stockholm | HAND TOOL FOR MAKING HOLES IN e.g. FIBRE-REINFORCED COMPOSITES, BY MEANS OF AN ORBITALLY MOVING CUTTER |
| CN101537512A (en) * | 2009-04-17 | 2009-09-23 | 天津大学 | Method for helically milling hole and device thereof |
| CN105728811A (en) * | 2016-04-20 | 2016-07-06 | 南京信息职业技术学院 | Robotized spiral drilling method and system for laminated structure of airframe |
| CN106077774A (en) * | 2016-07-07 | 2016-11-09 | 大连理工大学 | A kind of ultrasonic helical milling device and processing method |
Non-Patent Citations (1)
| Title |
|---|
| 碳纤维复合材料/钛合金叠层结构机翼自动化制孔技术研究;陈光林;《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》;20170615(第06期);第6、24、27、29-30页 * |
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