CN113579650A - Part machining method for improving one-time clamping success rate of numerically-controlled machining honeycomb - Google Patents
Part machining method for improving one-time clamping success rate of numerically-controlled machining honeycomb Download PDFInfo
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- CN113579650A CN113579650A CN202110844261.1A CN202110844261A CN113579650A CN 113579650 A CN113579650 A CN 113579650A CN 202110844261 A CN202110844261 A CN 202110844261A CN 113579650 A CN113579650 A CN 113579650A
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Abstract
The invention belongs to the technical field of numerical control machining, and particularly relates to a part machining method for improving the one-time clamping success rate of a numerical control machining honeycomb, which comprises the steps of manufacturing a part blank, reserving two encapsulation areas for supporting drill bit drilling during composite material honeycomb forming, respectively machining through holes in the two encapsulation areas, arranging a tool profile and two tool holes corresponding to the part profile on a part tool, placing the part blank on the part tool, ensuring that the two through holes are aligned with the two tool holes one by one, and tightly attaching the part profile to the tool profile by using a double faced adhesive tape; performing finish machining on the full-size characteristics of the part on a numerical control machine tool to obtain a rudiment part; brushing the rudiment part with absolute ethyl alcohol to detach the rudiment part from the part tool; and filling the filling and sealing area where the through hole is located by adopting a filling and sealing mode. The technical scheme can effectively solve the problem that the honeycomb parts with complex structures are difficult to clamp at one time, improves the processing quality and the efficiency success rate of the parts, and ensures the delivery quality of products.
Description
Technical Field
The invention belongs to the technical field of numerical control machining, and particularly relates to a part machining method for improving the one-time clamping success rate of a numerical control machining honeycomb.
Background
The composite material honeycomb core as a filling material has excellent performances such as excellent space geometric structure and excellent mechanical property, and is increasingly popularized in the application of new-generation aviation assembly. With the development of aviation technology, the requirements of new generation aviation equipment are higher and higher, the traditional smooth two-sided honeycomb structure cannot meet the industrial requirements, and more honeycomb core parts with complex curved surface structures are produced at the same time.
The traditional honeycomb core structure part is subjected to numerical control machining, the molded surface is bonded to be used as a datum for clamping and positioning, and the side baffle is used for further alignment. However, for the honeycomb parts with the novel complex curved surface structures, the curved surfaces are complex, so that the adhered positioning molded surfaces are too many, and the phenomenon of over-positioning is easily caused, so that the part parts are not accurately clamped and positioned. The clamping depends on the experience and skill of operators, and generally the precision is more than or equal to 2 mm; the two are fixed by the double-sided adhesive tape in a bonding way, so that the clamping is not accurate once, the double-sided adhesive tape can be taken down again for re-clamping, the operation is complex, reasonable control means and standards are not provided, certain risk exists, and the efficiency is lower.
The investigation refers to the current metal machine adds a clamping alignment mode, mostly is two holes one side scheme, and the precision is steerable within 0.1mm, and its mode method has high reference value and actual maneuverability, but its scheme is transplanted on honeycomb processing, has higher risk and the degree of difficulty in the hole making aspect:
on one hand, the honeycomb core structure is different from general solid metal and is a hollow structure formed by a plurality of hexagonal cells surrounded by aramid paper with the thickness of 0.05-0.1mm, and the vertical drilling can cause the actual processing effect to be not the traditional solid hole but a round hole approximately fitted by six disconnected aramid paper, as shown in fig. 4. And discontinuous aramid paper is extremely easy to damage and damage, and the fixing and aligning effect of the aramid paper is extremely poor.
Compared with metal materials, the mechanical properties of the honeycomb material are greatly different, and the honeycomb material is mainly characterized in that the structure of the material in a plane where the material is located in the transverse direction and the longitudinal direction is discontinuous, so that the structure in the plane direction is poor in rigidity and good in plasticity, the honeycomb material is easy to generate extrusion deformation in the corresponding direction along with external stress, and the honeycomb material can deform along with external force by taking holes in the plane structure where the material is located in the transverse direction and the longitudinal direction as a reference. Such mechanical properties determine their unreliability in relying on planar orientation of the hole wall.
Therefore, how to break through the difficulty in the honeycomb structure hole making technology, the part processing method for improving the one-time clamping success rate of numerical control processing honeycombs is designed, and the method has important significance for guiding the process preparation of process personnel and the field processing of operating personnel aiming at the honeycomb parts with complex curved surface structures.
Disclosure of Invention
In order to solve the technical problems, the invention provides a part machining method for improving the one-time clamping success rate of numerical control machining honeycombs, which can effectively solve the problem of difficulty in one-time clamping of honeycomb parts with complex structures, improve the machining quality and the efficiency success rate of the parts and ensure the delivery quality of products.
The method is realized by the following technical scheme:
the part processing method for improving the one-time clamping success rate of the numerical control machining honeycomb comprises the following steps of:
s1, manufacturing a part blank: determining the size of a blank according to the size of the part structure, and blanking based on the size of the blank to obtain a part blank, wherein the obtained part blank meets the requirements of part processing and design;
s2, performing composite material encapsulation, reserving two encapsulation areas for supporting drill bit drilling during composite material honeycomb forming, wherein the two encapsulation areas are respectively positioned at two ends of a part square blank in the length direction;
s3, installing a drill bit on the numerical control machine, starting the numerical control machine, and respectively processing through holes in two encapsulation areas to be used as a reference for subsequent finish machining alignment;
s4, preparing a part tool, arranging a tool profile corresponding to the part profile on the part tool, and arranging two tool holes corresponding to the through holes one by one on the part tool;
s5, placing the part blank on a part tool, and tightly attaching the part profile and the tool profile by using a double faced adhesive tape under the condition of ensuring that the two through holes are aligned with the two tool holes one by one;
s6, fixing the part blank on a numerical control machine tool based on a part tool, and finely machining the full-size characteristics of the part on the numerical control machine tool to obtain a rudiment part;
s7, brushing the rudiment part with absolute ethyl alcohol to make the adhesive tape between the rudiment part and the part tool lose viscosity, so as to detach the rudiment part from the part tool;
and S8, filling the filling and sealing area where the through hole is located by using foaming adhesive as a material in a filling and sealing mode, so that the structure of the rudiment part is complete, and the final complete part structure is obtained.
Preferably, in the step S1, a machining allowance of at least 30mm is reserved for the size of the part blank relative to the actual size of the part.
Preferably, in step S2, the potting region is a mixed solid structure formed by filling the honeycomb core cells with foam rubber.
Preferably, the encapsulation area is square with the side length of L, the through hole is positioned in the center of the encapsulation area, the diameter of the through hole is d, and d is not more than L-6 mm.
Preferably, the diameter of the tool hole is D, and D = D + n, n =1 ~ 2 mm.
Preferably, in step S3, the through hole is machined by a method that does not cyclically drill, the feeding and retracting values of the cutter are consistent with the machining parameters, and the machining parameters are S =4000r/min and F =200 mm/min.
Preferably, in step S5, the step of closely attaching the part profile to the tool profile by using a double-sided tape includes the steps of:
s51, determining a double-sided adhesive tape pasting area according to the size of the part blank;
s52, adhering and covering a double-sided adhesive tape adhering area by adopting a double-sided adhesive tape with the thickness of 0.6 mm;
and S53, placing the part blank on the double-sided adhesive, and carrying out static pressure for 2-3 hours by adopting a sand bag to ensure that the part profile is tightly attached to the tooling profile.
The beneficial effect that this technical scheme brought:
1) the method provides a scientific, simple and convenient part machining method for improving the one-time clamping success rate of numerically-controlled machining honeycombs, clamping and positioning are achieved in a mode of one surface with two holes, compared with the traditional clamping mode of the parts, the two process holes are added to serve as the alignment reference, the alignment precision is improved to be within 1mm through the matching relation between hole pins, the mode that the original clamping method completely depends on the experience hand feeling of workers is broken, the part clamping alignment and numerical control machining are conducted scientifically and standardly, the clamping difficulty is simplified, and the machining quality and the efficiency success rate of the parts are guaranteed.
2) During processing, the difficult-to-drill area of the honeycomb part is changed into the drillable area through a foaming glue filling and sealing mode, then the datum hole is formed through numerical control processing, and the datum condition is achieved for clamping and aligning two subsequent holes.
3) During clamping, a reference is given on the part, and an operator can find a rough reference before bonding with the tool, so that the success rate of one-time clamping is improved. The tedious work caused by repeated clamping is avoided, and the working quality and the efficiency success rate are improved.
Drawings
FIG. 1 is a schematic axial view of a part;
FIG. 2 is a schematic structural diagram of a front side of a part;
FIG. 3 is a schematic view of a part and part fixture sticking structure;
FIG. 4 is a schematic view of a composite honeycomb core structure;
FIG. 5 is a list of common cutting tools for numerically controlled milling honeycomb according to the present embodiment;
FIG. 6 is a table showing the setting of the steps of the numerical control milling honeycomb according to the present embodiment;
in the figure:
1. a part blank; 2. an encapsulation area; 3. a through hole; 4. a part is assembled; 5. a tooling hole; 6. and (4) double-sided adhesive tape.
Detailed Description
In order to make the objects, technical solutions and advantages 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 for explaining the present invention and not for limiting 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.
Example 1
The embodiment discloses a part machining method for improving the one-time clamping success rate of numerically-controlled machining honeycombs, which is a basic implementation scheme of the invention and is characterized by comprising the following steps of:
s1, manufacturing a part blank 1: determining the size of a blank according to the size of a part structure, and blanking based on the size of the blank (namely, the part material is a composite honeycomb part, the profile of the honeycomb part is complex and variable and is difficult to clamp and align at one time, the honeycomb part ensures that the local encapsulation treatment of the honeycomb part does not influence the overall strength and structure, the profile is complex and variable and determines that the difficulty of the one-time clamping of the honeycomb part is large, the precision is more than or equal to 2 mm), so as to obtain a part blank 1, the obtained part blank 1 meets the requirements of part processing and design, the size of the part blank 1 generally needs to be ensured to meet the part processing, namely, the size of the part blank 1 is relative to the actual size of the part, and a processing allowance of at least 30mm is reserved;
s2, composite material encapsulation, two encapsulation areas 2 for supporting drill bit drilling are reserved during composite material honeycomb forming, the two encapsulation areas 2 are respectively located at two ends of a part square blank in the length direction, namely, the composite material is subjected to foaming glue encapsulation in a single reserved area (encapsulation area 2) during honeycomb core blank, the encapsulation area 2 is a mixed solid structure formed by filling honeycomb core grids with foaming glue, the cutting characteristic of the solid structure is different from that of the honeycomb structure, the drill bit can be used for drilling, as shown in figure 4, the cutting performance of a conventional honeycomb part in an XY plane (a plane where the transverse and longitudinal directions are located) is good, the Z direction is used as a bearing surface, the cutting performance is poor, and therefore the encapsulation area 2 is used for replacing the honeycomb structure; the positions of the two encapsulation areas 2 can ensure that the subsequent two hole sites envelop the structure of the part as much as possible, thereby ensuring the reality and the accuracy of alignment evaluation;
s3, installing a drill bit on the numerical control machine, starting the numerical control machine, and respectively processing through holes 3 in the two encapsulation areas 2 to be used as a reference for subsequent finish machining alignment; the encapsulation region 2 is required to completely envelop a drilling region (namely the through hole 3), the area is reduced as much as possible, the influence on parts is reduced, the encapsulation region 2 is generally ensured to be a square with the side length of L, the through hole 3 is positioned at the center of the encapsulation region 2, and the side length of the encapsulation region 2 is L and the diameter D1 of the through hole 3 meet the following relation: d is less than or equal to L-6 mm; the diameter of the through hole 3 is generally recommended to be between phi 16 and phi 24, and if the diameter d =18mm of the through hole 3, the encapsulation area 2 can be selected to be 25 × 25 mm; the through hole 3 is processed in a mode of not circularly drilling once, the processing parameters can be S4000r/min and F200mm/min, and the feeding values of the feed and the retreat cutters are consistent with the processing parameters;
s4, preparing a part tool 4, arranging a tool profile corresponding to the part profile on the part tool 4, and arranging two tool holes 5 corresponding to the through holes 3 one by one on the part tool 4;
s5, placing the part blank 1 on a part tool 4, and tightly attaching the part profile and the tool profile by using the double faced adhesive tape 6 under the condition of ensuring that the two through holes 3 are aligned with the two tool holes 5 one by one;
s6, fixing the part blank 1 on a numerical control machine tool based on the part tool 4, and finely machining the full-size characteristics of the part on the numerical control machine tool to obtain a rudiment part; specifically, under the condition of universal five-axis numerical control machining, a special honeycomb cutter is used for machining part features, and the machining mode is generally one-way truss cutting. The machining tool and the process steps are arranged as shown in fig. 5 and 6. The full characteristic size of a processed part generally comprises a profile, a contour and a lower limit area;
s7, brushing the rudiment part with absolute ethyl alcohol to make the adhesive tape between the rudiment part and the part tool 4 lose viscosity, so as to detach the rudiment part from the part tool 4, and further, before that, cleaning the residual dust or processing fragments in the honeycomb core grid by a dust collector or other methods;
and S8, filling the filling and sealing area 2 where the through hole 3 is located by filling and sealing the filling and sealing area with the foaming adhesive as a material, so that the rudiment part has a complete structure to obtain a final complete part structure, and the structural integrity and strength qualification of the part are ensured. The honeycomb part is filled with the foaming adhesive locally, the overall structure and the performance of the honeycomb part are not influenced, and the rear-end assembly requirement is met.
After the parts are machined, the molded surfaces of the parts are measured by a measuring machine or on-line measurement, the peripheral profiles of the honeycomb core parts are inspected according to the profiles of the parts on the tool, and the surface quality of the parts is inspected by visual inspection and comparison of standard parts.
The method provides a scientific, simple and convenient part machining method for improving the one-time clamping success rate of numerically-controlled machining honeycombs, clamping and positioning are achieved in a mode of one surface with two holes, compared with the traditional clamping mode of the parts, the two process holes are added to serve as the alignment reference, the alignment precision is improved to be within 1mm through the matching relation between hole pins, the mode that the original clamping method completely depends on the experience hand feeling of workers is broken, the part clamping alignment and numerical control machining are conducted scientifically and standardly, the clamping difficulty is simplified, and the machining quality and the efficiency success rate of the parts are guaranteed. During processing, the difficult-to-drill area of the honeycomb part is changed into the drillable area through a foaming glue filling and sealing mode, then the datum hole is formed through numerical control processing, and the datum condition is achieved for clamping and aligning two subsequent holes. During clamping, a reference is given on the part, and an operator can find a rough reference before bonding with the tool, so that the success rate of one-time clamping is improved. The tedious work caused by repeated clamping is avoided, and the working quality and the efficiency success rate are improved.
Example 2
The embodiment discloses a part machining method for improving the one-time clamping success rate of numerically-controlled machining honeycombs, and as a preferred embodiment of the invention, in embodiment 1, the diameter of a tool hole 5 is D, and D = D + n, n = 1-2 mm, and the two-hole one-surface positioning is realized through the cooperation of hole pins, so that the one-time clamping precision is controlled to be 0.5-1 mm, for example, the part fabrication hole diameter D1=18mm, and the hole diameter D2=20 mm of the tool hole 5.
Example 3
The embodiment discloses a part processing method for improving the one-time clamping success rate of numerical control processing honeycombs, which is a preferred embodiment of the invention, namely, in step S5 of embodiment 1, the step of tightly attaching the part profile and the tool profile by using a double-sided adhesive tape 6 comprises the following steps:
s51, determining the pasting area of the double-sided adhesive tape 6 according to the size of the part blank 1;
s52, adhering and covering the adhering area of the double-sided adhesive tape 6 by adopting the double-sided adhesive tape 6 with the thickness of 0.6 mm;
and S53, placing the part blank 1 on the double-sided adhesive tape 6, and carrying out static pressure for 2-3 hours by adopting a sand bag to ensure that the part profile is tightly attached to the tooling profile.
Claims (7)
1. The part processing method for improving the one-time clamping success rate of the numerical control machining honeycomb is characterized by comprising the following steps of:
s1, manufacturing a part blank (1): determining the size of a blank according to the size of the part structure, and blanking based on the size of the blank to obtain a part blank (1), wherein the obtained part blank (1) meets the requirements of part processing and design;
s2, performing composite material encapsulation, reserving two encapsulation areas (2) for supporting drill bit drilling during composite material honeycomb forming, wherein the two encapsulation areas (2) are respectively positioned at two ends of the blank of the square material of the part in the length direction;
s3, installing a drill bit on the numerical control machine, starting the numerical control machine, and respectively processing through holes (3) in two encapsulation areas (2) to be used as a reference for subsequent finish machining alignment;
s4, preparing a part tool (4), arranging a tool profile corresponding to the part profile on the part tool (4), and arranging two tool holes (5) corresponding to the through holes (3) one by one on the part tool (4);
s5, placing the part blank (1) on a part tool (4), and tightly attaching the part profile and the tool profile by using a double-sided adhesive tape (6) under the condition of ensuring that the two through holes (3) are aligned with the two tool holes (5) one by one;
s6, fixing the part blank (1) on a numerical control machine tool based on a part tool (4), and finely machining the full-size characteristics of the part on the numerical control machine tool to obtain a rudiment part;
s7, brushing the rudiment part with absolute ethyl alcohol to make the adhesive tape between the rudiment part and the part tool (4) lose viscosity, so as to detach the rudiment part from the part tool (4);
and S8, filling the filling and sealing area (2) where the through hole (3) is located by filling and sealing the foaming adhesive serving as a material, so that the rudiment part is complete in structure to obtain a final complete part structure.
2. The part machining method for improving the one-time clamping success rate of the numerical control machining honeycomb according to claim 1, is characterized in that: in the step S1, a machining allowance of at least 30mm is reserved for the size of the part blank (1) relative to the actual size of the part.
3. The part machining method for improving the one-time clamping success rate of the numerical control machining honeycomb according to claim 1, is characterized in that: in the step S2, the potting region (2) is a mixed solid structure formed by filling the honeycomb core cells with the foaming adhesive.
4. The part machining method for improving the one-time clamping success rate of the numerical control machining honeycomb according to claim 1, is characterized in that: the encapsulation area (2) is square with the side length of L, the through hole (3) is located in the center of the encapsulation area (2), the diameter of the through hole (3) is d, and d is smaller than or equal to L-6 mm.
5. The part machining method for improving the one-time clamping success rate of the numerical control machining honeycomb according to claim 4, is characterized in that: the diameter of the tool hole (5) is D, D = D + n, and n =1 ~ 2 mm.
6. The part machining method for improving the one-time clamping success rate of the numerical control machining honeycomb according to claim 1, is characterized in that: in the step S3, the through hole (3) is processed in a mode of not circularly drilling, the feed value of the advancing and retreating cutter is consistent with the processing parameters, and the processing parameters are S =4000r/min and F =200 mm/min.
7. The part machining method for improving the one-time clamping success rate of the numerical control machining honeycomb according to claim 1, is characterized in that: in the step S5, the step of tightly attaching the part molded surface and the tool molded surface by using the double faced adhesive tape (6) comprises the following steps:
s51, determining the pasting area of the double-sided adhesive tape (6) according to the size of the part blank (1);
s52, adhering and covering the adhering area of the double-sided adhesive tape (6) by adopting the double-sided adhesive tape (6) with the thickness of 0.6 mm;
and S53, placing the part blank (1) on a double-sided adhesive tape (6), and carrying out static pressure for 2-3 hours by adopting a sand bag to ensure that the part profile is tightly attached to the tool profile.
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