CN114879601B - Numerical control machining method for complex molded panel carbon felt forming die - Google Patents
Numerical control machining method for complex molded panel carbon felt forming die Download PDFInfo
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- 238000003754 machining Methods 0.000 title claims abstract description 66
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 13
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 13
- 238000000034 method Methods 0.000 title abstract description 12
- 238000003801 milling Methods 0.000 claims description 15
- 238000003825 pressing Methods 0.000 claims description 4
- 238000003672 processing method Methods 0.000 claims description 4
- 238000005070 sampling Methods 0.000 claims description 2
- 238000005299 abrasion Methods 0.000 abstract description 4
- 238000005498 polishing Methods 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000002131 composite material Substances 0.000 abstract description 2
- 230000007547 defect Effects 0.000 abstract description 2
- 238000005520 cutting process Methods 0.000 description 6
- 230000007306 turnover Effects 0.000 description 3
- 238000000137 annealing Methods 0.000 description 2
- 230000000295 complement effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
- G05B19/408—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by data handling or data format, e.g. reading, buffering or conversion of data
- G05B19/4083—Adapting programme, configuration
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/35—Nc in input of data, input till input file format
- G05B2219/35356—Data handling
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
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- Engineering & Computer Science (AREA)
- Human Computer Interaction (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Milling Processes (AREA)
Abstract
The invention provides a numerical control machining method of a complex-profile wallboard carbon felt forming die, and belongs to the field of numerical control machining of composite material wallboard tools. The numerical control machining method of the multi-groove, large-plane and small-curvature 'convex' molded panel carbon felt forming die simplifies the numerical control machining process of the molded surface of the template, and the surface of the molded surface after machining is smooth to achieve the Ra1.6 standard and the Ra3.2 standard, so that the method has the defects of hard points, cutter receiving height difference and the like during ball-free cutter machining, high molded surface precision, small deformation, small workload during manual polishing, reduced polishing time, further improved production efficiency, less abrasion of cutters and blades during machining, reduced machining cost, multiple improvement of machining efficiency, shortened occupied machine tool time and high economical efficiency.
Description
Technical Field
The invention relates to the field of numerical control machining of composite material wallboard tools, in particular to a numerical control machining method of a multi-groove, large-plane and small-curvature 'convex' molded surface wallboard carbon felt forming die.
Background
The wallboard type carbon felt moulded die comprises template subassembly and frame subassembly, and template subassembly contains template, shaping dog, apron etc. and template outline size is about 3000mm, and the profile contains a lot of second grade recesses, and the groove upper end opening is the border inclined plane, and other profiles are large tracts of land plane and large tracts of land little camber "protruding" profile, therefore the profile is very complicated.
In actual production, large-diameter R cutters are adopted for rough milling of templates with complex molded surfaces, end mills are used for processing planes, groove bottoms and side vertical surfaces, and spherical cutters are used for semi-finishing and finish machining of curved surfaces. Because the R-cutter rough milling rear plane, the groove bottom and the side elevation allowance are larger, in order to prevent the cutter cutting edge and the cutter body from being broken during the end mill processing, the processing can only be carried out by setting 20% -30% of the processing feed quantity F=100 mm/min, the processing speed is slow, the cutter is continuously worn during the processing, the phenomena of low profile near the feeding near the profile, high profile near the withdrawal and small notch size occur after the end mill bottom edge and the side edge are worn, the deviation is about 0.4mm, and a plurality of new cutters need to be replaced during the processing process in order to ensure the processing precision.
The method for processing the curved surface of the ball cutter is very mature, but the cutter point is easy to wear when processing the large-area small-curvature molded surface, the surface of the molded surface processed after the cutter point is worn is coarser than Ra12.5 and can not meet the standard requirements of Ra1.6 and Ra3.2, so that in order to ensure the surface quality of the molded surface, a new blade needs to be frequently replaced in the processing process, but the joint of the molded surfaces processed by the new blade and the old blade can have a step of about 0.3mm after the new blade is replaced; in order to ensure the machining precision during semi-finishing and finish machining of the ball cutter, the machining step pitch parameter cannot be too large, and the step pitch during finish milling is only 0.3mm, so that the machining time is too long.
Disclosure of Invention
The invention discloses a numerical control processing method of a multi-groove, large-plane and small-curvature 'convex' profile wallboard carbon felt forming die, which is characterized in that a large plane is formed in the range of a central multi-groove, a plurality of secondary grooves are formed in the range of the central multi-groove, as shown in fig. 1 and 2, the primary grooves and the secondary grooves are defined as a primary groove and a secondary groove from top to bottom, wherein the bottom surface of the primary groove is a stop block height positioning surface, the precision requirement is high, the outer ring is a small-curvature 'convex' profile, the processing efficiency is extremely low, and the processing precision is low.
The technical scheme of the invention is as follows:
the numerical control processing method of the complex molded panel carbon felt forming die comprises the following steps:
Step one: the whole profile is roughly machined by a large-diameter 66R cutter, the rotating speed S=1500 turn/min, the feeding amount F=6000 mm/min, the allowance of the profile is firstly aligned during machining, the sampling interval is 200mm, the profile is adjusted until the allowance is uniform, the profile is turned over again after the bottom surface of the tool is turned over and milled, the allowance of one side of the profile is 4mm, and the machining stress is removed by annealing after the machining is completed.
Step two: the whole molded surface is rough machined by a large-diameter 66R cutter again, the rotating speed S=1500 turn/min, the feeding quantity F=6000 mm/min, the single-sided allowance of the molded surface is 1mm, the loose pressing plate is used for checking the state of the base surface of the bottom surface after machining is finished, the flatness is smaller than 0.2mm, machining can be continued, otherwise, the bottom surface of the tool is required to be turned over again and milled until the flatness is smaller than 0.2mm.
Step three: and (3) machining the unprocessed molded surface and the allowance which are in place after the second machining by using a high-precision small-diameter 20R cutter, wherein the rotating speed S=2500 turn/min, the feeding amount F=6000 mm/min and the molded surface allowance of 0.2mm.
Step four: the multi-groove characteristic part molded surface is processed by adopting an end mill, the allowance is only 0.2mm based on the step three, the processing allowance is reduced, the end mill can set the processing rotating speed S=800 turn/min when processing the groove bottom plane and the side elevation, and the feeding quantity F=200 mm/min is used for high-speed milling processing.
Step five: and (3) finish milling the large plane characteristic molded surface part in the molded surface by adopting a high-precision small-diameter 20R cutter, wherein the allowance of the molded surface is only 0.2mm based on the third step, the machining allowance is reduced, the step overlapping is set to be 50%, the rotating speed S=2500 turn/min, and the feeding amount F=3500 mm/min for machining.
Step six: the small curvature 'convex' profile is also finely milled by a high-precision small-diameter 20R cutter, the step distance is 1-3 mm, the rotating speed S=3000 turn/min, the feeding amount F=4500 mm/min, and the one-time processing is finished.
Step seven: the rest types of molded surfaces and the notch in the molded surfaces are machined by adopting a phi 16R8 ball cutter and a phi 10 end mill, the machining rotating speed S of the phi 16R8 ball cutter is=3000 turn/min, the feeding quantity F is=6000 mm/min, the layering machining rotating speed S of the phi 10 end mill is=3000 turn/min, and the feeding quantity F is=2000 mm/min.
The invention has the beneficial effects that: the invention firstly adopts the large-diameter 66R knife to roughen the integral molded surface, then uses the high-precision small-diameter 20R knife to carry out the compensation processing and replace the ball knife to carry out the finish processing, has high processing efficiency and small processing allowance after the compensation processing, further reduces the tool abrasion when the end mill processes the multi-groove characteristic molded surface, prolongs the service life of the tool, ensures that the end mill can complete the processing of the multi-groove characteristic molded surface with the part of the groove bottom plane and the side elevation molded surface, ensures that the height of the groove bottom plane and the dimensional accuracy of the groove opening meet the tolerance requirement, and improves the processing efficiency of the end mill with larger allowance by about 7 times; after finishing finish milling of the large-plane characteristic molded surface part in the molded surface by adopting a high-precision small-diameter 20R cutter, the phenomenon that the cutter feeding point is low and the cutter retracting point is high can not occur in the large-plane molded surface, and the machining efficiency is improved by about 66 times by using a large-allowance end mill, so that the molded surface precision is within +/-0.02 mm; the small curvature 'convex' profile is also finely milled by adopting a high-precision small-diameter 20R cutter, the step distance is 1-3 mm, the one-time processing is completed, the semi-fine milling and finish milling processing flow of the ball cutter is simplified, the processing efficiency is improved by about 5 times compared with that of the ball cutter, the heat generated by the cutter processing is small, the processing stress is reduced, the deformation of a template is reduced, the abrasion of the cutter is hardly seen by naked eyes after the processing of the cutter without changing the cutter is completed, the surface smoothness of the processed profile can reach the Ra1.6 standard and the Ra3.2 standard, and the profile precision is +/-0.05 mm.
Drawings
Fig. 1 is a schematic perspective view of a wallboard-like carbon felt forming die tooling.
Fig. 2 is a two-dimensional schematic diagram of a wallboard-like carbon felt forming die tooling, wherein (a) is a front view, (b) is a side view, (c) is a top view, and (d) is A-A view.
FIG. 3 is a detailed schematic diagram of a wallboard-like carbon felt forming die tooling groove.
Fig. 4 Φ 20R1.5 a schematic view of a numerical control milling cutter insert.
Detailed Description
1) And selecting a cutter.
Rough machining: 66R knife. The common 66R knife is selected for processing because the allowance is large;
Additional processing based on second rough milling: phi 20R1.5R knife. And selecting cutters with diameters of 20 and below according to the corner of the groove turning part of the molded surface of the mold, wherein the parameters of the cutters must be precise and reversible due to small machining allowance, so that the cutters with phi 20R1.5R are selected for machining. The appearance of the phi 20R1.5 blade is as shown in fig. 4, the blade is in a regular square shape, the rotation diameter D=20mm, the bottom angle R=1.5 mm of the cutting edge of the cutter is regular, the cutter precision is high, and the rotation deviation is 0.01mm;
Finish machining of a groove bottom plane and a side elevation: phi 20 end mill, phi 16 end mill, phi 6 end mill. Selecting a phi 16 end mill for machining according to a round angle primary groove at the turning part of a groove of a multi-groove characteristic part of the template, selecting a phi 20 end mill for machining a secondary groove, and selecting a phi 6 end mill clear angle at the turning part;
Finish machining of a large plane in the molded surface: phi 20R1.5R knife.
Finish machining of a small-curvature 'convex' profile surface: phi 20R1.5R knife.
Finishing the rest of the small part of the molded surfaces and the rest of the molded surfaces and the notch: phi 16R8 ball cutter and phi 10 end mill. And the rest molded surfaces are processed by adopting a phi 16R8 ball cutter, and the air guide grooves are processed by adopting a phi 10 end mill.
2) And (5) performing rough machining for the first time. Aligning the surface allowance, preparing an alignment processing reference surface and a turnover reference block, turning over a tool, setting up the size of the reserved reference, milling the bottom surface of the tool, turning over the tool, selecting a common phi 66R tool for processing, wherein the depth of a cutting layer is=0.5 mm, the surface of the tool is in a blank state, the allowance is large, an oblique feeding mode is adopted, the feeding amount F=6000 mm/min and the rotating speed S=1500 turn/min, rough machining is carried out on the top surface of the surface and the inner groove, the allowance is 4mm, and the processing reference is prepared. Annealing for stress relief after the first rough machining.
3) And (5) performing rough machining for the second time. After the stress is removed, checking the state of a reference surface of the bottom surface of the tool, referring to a first rough machining reference, aligning the allowance of a molded surface, preparing an alignment machining reference surface and a turnover reference block, turning the tool, starting the size of the reserved reference, milling the bottom surface of the tool, turning the tool, selecting a common phi 66R tool for machining, wherein the depth of a cutting layer is=0.5 mm, the molded surface of the tool has the allowance of 4mm, the tool is large, adopting an oblique feeding mode, the feeding amount is F=6000 mm/min, the rotating speed is=1500 turn/min, carrying out second rough machining on the top surface of the surface and the inner groove, reserving the allowance of 1mm, and preparing the machining reference.
4) And (5) performing compensation machining based on the second rough milling. After the second rough machining is finished, checking the bottom surface state of the tool by the loose pressing plate, continuing to carry out the repair machining when the flatness is less than 0.2mm, compacting the contact position of the bottom surface of the tool and the real point of the workbench by the pressing plate when the flatness is more than or equal to 0.2mm, preparing and aligning the machining reference surface and the turnover reference block, turning over the tool, setting the size by the reserved reference, and milling the bottom surface of the tool again.
And when the flatness is less than 0.2mm, the working procedure of the complementary processing is as follows: and selecting a phi 20R1.5 cutter for machining, adopting an oblique feeding mode, wherein the depth of a cutting layer is=0.3 mm, the feeding amount F is=6000 mm/min, the rotating speed S is=2500 turn/min, and the top surface of the profile, the inner groove and the position where the 66R cutter is not machined are subjected to complementary machining, so that the allowance is 0.2mm.
5) And (5) finishing the groove bottom plane and the side elevation. The primary groove is selected from a phi 16 end mill, the secondary groove is selected from a phi 20 end mill, the surface allowance is smaller and is only 0.2mm, the processing speed can be improved, the feeding amount F=200 mm/min, the rotating speed S=800 turn/min, an oblique feeding mode is adopted when the groove bottom plane is processed, and an arc cutter advancing and retreating mode is adopted when the side elevation is processed; and selecting a phi 6 end mill for layered processing and clearing angles at the corners, adopting an arc cutter feeding and retracting mode, wherein the cutting depth is=0.1 mm, the feeding amount F is=1000 mm/min, and the rotating speed S is=1200 turn/min, so that the processing is in place.
6) And (5) finishing a large plane in the molded surface. Selecting a phi 20R1.5 cutter for processing, adopting an oblique feeding mode, selecting a step distance of 0 < D-2R, namely, overlapping the step distance by 50% when the step distance is 10mm, wherein the feeding amount F is 3500mm/min, and the rotating speed S is 2500turn/min, and processing in place.
7) And (5) finishing the 'convex' profile with small curvature in the profile. Phi 20R1.5 is selected for machining, the step distance is 1.5mm, the feeding amount F is 4500mm/min, the rotating speed S is 3000turn/min, and the machining is in place. Profile accuracy is 0.01mm when step = 1.5mm, and 0.1mm when step = 5 mm. The set value of the step distance is related to the diameter and the profile state of the cutter, the larger the diameter of the cutter is, the set value of the step distance can be properly increased, the 'convex' curvature of the profile is complex, the diameter of the cutter is properly reduced, and the larger the set value of the step distance is, the less processing time is needed.
8) The remaining small portion of the profile is finished with the remaining type of profile and the notch. Selecting a phi 16R8 cutter for processing a curved surface profile, wherein the step distance is 0.3mm, the feeding quantity F is 6000mm/min, and the rotating speed S is 3000turn/min, so that the processing is in place; the air guide groove is a groove with the same depth as the molded surface, the curvature of the groove bottom changes along with the change of the molded surface, a phi 10 end mill is selected for processing, the feeding quantity F=2000 mm/min, the rotating speed S=3000 turn/min, and the layered processing is in place.
The numerical control processing method of the multi-groove, large-plane and small-curvature 'convex' molded panel carbon felt forming die simplifies the numerical control processing process of the molded surface of the template, and the surface of the molded surface after processing is smooth to achieve the standard of Ra1.6 and Ra3.2, has the defects of hard points, cutter receiving height difference and the like during ball cutter processing, has high molded surface precision, small deformation, small workload during manual polishing, reduces polishing time, further improves production efficiency, reduces cutter and blade abrasion during processing, saves processing cost, improves the processing efficiency by a plurality of times, reduces occupied machine tool time and has high economy.
Claims (1)
1. The numerical control processing method of the complex molded panel carbon felt forming die is characterized by comprising the following steps of:
Step one: rough machining is carried out on the overall molded surface by adopting a large-diameter 66R cutter, the rotating speed S=1500 turn/min and the feeding quantity F=6000 mm/min, the allowance of the molded surface is firstly aligned during machining, the sampling interval is 200mm, the molded surface is adjusted until the allowance is uniform, the bottom surface of a tool is turned over again for machining after the turning over is milled flat, the single-surface allowance of the molded surface is 4mm, and the machining stress is removed after the machining is finished;
Step two: rough machining is carried out on the overall molded surface by adopting a large-diameter 66R cutter again, the rotating speed S=1500 turn/min, the feeding quantity F=6000 mm/min, the single-surface allowance of the molded surface is 1mm, the loose pressing plate is used for checking the state of the base surface datum plane after machining is finished, the machining is continued when the flatness is smaller than 0.2mm, otherwise, the bottom surface of the tool is required to be turned over again and milled flat until the flatness is smaller than 0.2mm;
step three: machining the unprocessed molded surface and the allowance which are in place on the basis of the machined molded surface in the second step by using a high-precision small-diameter 20R cutter, wherein the rotating speed S=2500 turn/min, the feeding amount F=6000 mm/min and the molded surface allowance of 0.2mm;
Step four: the multi-groove characteristic part molded surface is processed by an end mill, the allowance of the molded surface is only 0.2mm based on the step three, the processing allowance is reduced, the end mill sets the processing rotation speed S=800 turn/min when processing the bottom plane and the side elevation of the groove, and the feeding quantity F=200 mm/min is processed by high-speed milling;
Step five: the large plane characteristic molded surface part in the molded surface is finely milled by adopting a high-precision small-diameter 20R cutter, the allowance is only 0.2mm based on the third molded surface, the machining allowance is reduced, the set step is overlapped by 50%, the rotating speed S=2500 turn/min, and the feeding amount F=3500 mm/min for machining;
Step six: the small curvature 'convex' profile is also finely milled by a high-precision small-diameter 20R cutter, the step distance is 1-3 mm, the rotating speed S=3000 turn/min, the feeding quantity F=4500 mm/min, and the one-time processing is finished;
Step seven: and the rest types of molded surfaces and the notch in the molded surfaces are processed by adopting a phi 16R8 ball cutter and a phi 10 end mill, the processing rotating speed S=3000 turn/min of the phi 16R8 ball cutter, the feeding quantity F=6000 mm/min and the layering processing rotating speed S=3000 turn/min of the phi 10 end mill, and the feeding quantity F=2000 mm/min.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102591252A (en) * | 2012-03-08 | 2012-07-18 | 沈阳飞机工业（集团）有限公司 | Calculating and optimizing algorithm of numerical control machining tool path of parallel fillet wallboards |
| CN108405941A (en) * | 2018-02-28 | 2018-08-17 | 上海交通大学 | Blade of aviation engine blade type face high-efficiency and precision milling method |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US7451013B2 (en) * | 2004-04-29 | 2008-11-11 | Surfware, Inc. | Engagement milling |
| CN103699055B (en) * | 2013-12-24 | 2016-08-17 | 沈阳飞机工业（集团）有限公司 | Aircraft structure intelligent numerical control machining prgraming system and method |
| CN108762194B (en) * | 2018-05-29 | 2019-08-02 | 沈阳飞机工业（集团）有限公司 | A kind of numerical-control processing method of general-purpose type vacuum fraise jig |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102591252A (en) * | 2012-03-08 | 2012-07-18 | 沈阳飞机工业（集团）有限公司 | Calculating and optimizing algorithm of numerical control machining tool path of parallel fillet wallboards |
| CN108405941A (en) * | 2018-02-28 | 2018-08-17 | 上海交通大学 | Blade of aviation engine blade type face high-efficiency and precision milling method |
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