CN102069357A - Numerical control processing method of elastic bracket - Google Patents
Numerical control processing method of elastic bracket Download PDFInfo
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- CN102069357A CN102069357A CN 201010617555 CN201010617555A CN102069357A CN 102069357 A CN102069357 A CN 102069357A CN 201010617555 CN201010617555 CN 201010617555 CN 201010617555 A CN201010617555 A CN 201010617555A CN 102069357 A CN102069357 A CN 102069357A
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Abstract
The invention relates to a numerical control processing method of an elastic bracket, which comprises the following steps: (1) carrying out rough turning to bar stocks to be processed according to the design drawing of the elastic bracket; (2) seasoning workpieces obtained after rough turning to eliminate stress; (3) clamping a process chuck, finely turning the workpieces processed in step (2) in a numerical control mode to remove surplus in step (1), finely boring six uniformly distributed milling mounting holes at an excircle end surface, and cutting off the process chuck after processing; (4) processing the workpieces processed in step (3) circularly at high and low temperatures, stabilizing the sizes of the workpieces and further eliminating stress exerted by machines; (5) arranging the workpieces processed in step (4) on a mould to be finely milled in a numerical control mode with the cutting depth not larger than 0.2mm, the fine milling surplus not higher than 0.05mm, the cutter diameter less than phi3, the spindle rotation speed higher than 5000r/min and the feeding speed lower than 250mm/min in the fine milling process; and (6) disassembling the workpieces from the mould, and finely milling a conical surface of a hollow shaft of the elastic bracket on an ordinary fine turning lathe.
Description
Technical field
The present invention relates to a kind of numerical-control processing method of elastic support, especially relate to the key method that high orbit satellite optical sensor product axle module is realized long-life, high reliability.
Background technology
The swing type infrared earth sensor is applied to the numerous satellites on the high orbit satellite platform, and demand is big.Axle system is the important component part on the type infrared earth sensor.Improve axle system a long-life, highly reliable be the Fifth Academy of Aerospace Industry " 15 " reliability growth project.And elastic support is the strength member in the swing type infrared earth sensor axle module, supports the pendulum mirror, and can its quality be realize that whole infrared earth sensor realizes long-life, highly reliable key.
1) elastic support is complex-shaped, and (as shown in Figure 1), the spring leaf thin thickness, yielding, critical size is the tolerance strictness of the thickness of spring leaf, size Control is difficult.
2) inside and outside circular arc need process fillet with off-gauge profile milling cutter, and (as shown in Figure 2), and require inside and outside circular arc place and plane to seamlessly transit.
3) because the demand of elastic support grows with each passing day, produce in batches, this just requires stable technology, and higher qualification rate is arranged, and the accessory size high conformity of processing.
Elastic support once carried out the processing of a plurality of bouts in the past, was to adopt traditional manual processing mode always.But owing to limit by objective condition, and the part that processes, no matter be qualification rate, or quality all can not satisfy the needs of model far away.
1) traditional processing dimension control is unstable, and fluctuation is big, and overproof serious, qualification rate is low.
We once analyzed 123 metering results with thickness 1, thickness 2 and the thickness 4 (seeing Table 1) of the spring leaf of certain batch of elastic support of conventional method processing.
Result: X
Max=48mm, X
Min=35mm, extreme difference R=13mm is divided into 14 groups with data, and promptly k=14mm then organizes apart from h=R/k=13/14=0.92 ≈ 1, because minimum measurement unit is 1, is 0.5 so get boundary value, and each continuous data is sat in the right seat, and gets each packet size frequency distribution table:
Table 1 traditional diamond-making technique batch elastic support critical size frequency distribution table
Draw abscissa and ordinate in data value and frequency value ratio respectively, draw histogram, as shown in Figure 3, as can be seen from the figure, size fluctuation is big, and has most to drop on outside the margin of tolerance.By statistics, qualified size accounts for 66%.But take all factors into consideration other factors, then this batch qualification rate less than 20%.
2) tradition processing is difficult to guarantee the wall thickness requirement of corner, also is difficult to guarantee seamlessly transitting of inside and outside circular arc place.
3) influenced by human factor bigger for tradition processing, and factors such as processor's experience, health, mood all can have influence on the quality of processing.Because the dimension precision requirement height of elastic support, processor's notice need keep high concentration for a long time, can produce fatigue unavoidably.Add the requirement of mass, be difficult to guarantee the uniformity of size and the qualification rate of part.
4) owing to the limitation of manual equipment itself, it is insufficient to add the cooling in man-hour, and the heat that processing produces looses and do not go out, and causes machining stress bigger.Therefore need to carry out repeatedly heat treatment on the technology to eliminate machining stress, this has just caused the process-cycle long, and efficient is low, the requirement of very difficult assurance progress.
Summary of the invention
Technology of the present invention is dealt with problems and is: overcome the deficiencies in the prior art, a kind of numerical-control processing method of elastic support is provided, this method can guarantee that the qualification rate of elastic support reaches 85%, and can produce in batches.
Technical solution of the present invention is: elastic support numerical-control processing method, described elastic support are that an annulus connects three uniform heterotypic spring sheets, and the center is a hollow shaft, and the first half of hollow shaft is the conical surface; Step is as follows:
(1) treat the processing bar and carry out rough turnly according to the design drawing of elastic support, wherein, the monolateral 0.5 ± 0.1mm surplus of staying of excircle dimension is axially stayed 0.75 ± 0.05mm surplus, stays technology chuck length greater than 8mm, hollow shaft endoporus made allowance 0.5 ± 0.01mm;
(2) workpiece that obtains after rough turn is carried out Ageing Treatment, remove stress;
(3) clamp the technology chuck, the workpiece after handling through step (2) is carried out the numerical control finish turning, remove the surplus described in the step (1), and nose circle face right boring outside goes out six uniform miller installing holes, segment technology chuck after machining;
(4) workpiece after step (3) processing is carried out high low temperature circular treatment, stable workpiece size and further elimination machine add stress;
(5) workpiece after step (4) processing is installed in the enterprising line number control of mold finish-milling, round tool mills the interior circular arc of the spring leaf of elastic support in adopting earlier during finish-milling, adopt the external arc of the spring leaf of external arc cutter milling elastic support then, require in the milling process, milling is carried out in three spring leaf circulations, and cutter is in the milling direction unanimity of each spring leaf; Mill three fan sections between the spring leaf at last, the burr that produces when adopting the wedge angle cutter to remove milling;
In the finish-milling process, cutting depth is not more than 0.2mm, and the finish-milling surplus is not higher than 0.05mm, and the speed of mainshaft is higher than 5000r/min, and feed speed is less than 250mm/min;
Described mold comprises base, installation sheet, clamping kit, base has the structure of triangle firm support, six miller installing holes of workpiece are fitted on the center mounting hole of installation sheet, installation sheet is fixed on the base, the clamping kit outer ring is installed on the installation sheet, and the wedge that is fixed on the outer ring is with Work-sheet pressing;
Described cutter adopts molding cutter, comprises interior round tool, external arc cutter and wedge angle cutter, requires the cutter fillet to require consistent with the inside and outside circular arc of elastic support upper spring sheet;
(6) workpiece is pulled down the conical surface of finish turning elastic support hollow shaft on common fine turning lathe from above-mentioned mold.
After in described step (5), removing burr, workpiece is unloaded, detection springs sheet thickness, according to testing result correction numerical control program, the control tool wear is to the influence of workpiece size.
Described step (2) Ageing Treatment is heated to 190 ℃ ± 5 ℃ insulations eight hours for workpiece is put into electric drying oven with forced convection with drying box, is cooled to normal temperature.
High low temperature circulating treatment procedure in the described step (4) is as follows:
The first step is heated to 140～160 ℃ in electric drying oven with forced convection, be incubated 2 hours, workpiece is cooled to room temperature in air after, place SLXII moldeed depth ice chest or self-control liquid nitrogen case to lower the temperature, temperature is lower than-180 ℃ of insulations 2 hours, with workpiece as for rising again in the air to room temperature;
In second step, the above-mentioned first step is repeated once;
The 3rd step placed electric drying oven with forced convection to be heated to 140～160 ℃ workpiece, was incubated after 4～6 hours, was cooled to room temperature in air.
The present invention compared with prior art beneficial effect is:
(1) the inventive method is complex-shaped at elastic support, and the spring leaf thin thickness is yielding, the strictness of critical size tolerance, the technological difficulties that size Control is difficult are by formulating rational numerical control processing technology process, make the thin-walled place of workpiece not have distortion, dimensionally stable meets design requirement.The installation mold of the numerical control finish-milling that design is practical is realized finishing whole processing by a clamping.
(2) adopt the inventive method, the passing rate of processing of elastic support is from less than 20%, bring up to 95%, be higher than target setting 85% far away, the invention that this technology is described is very successful, can guarantee the demand of model task, for finishing smoothly of reliability growth project general objective made significant contribution to this part.
Description of drawings
Fig. 1 is design of part and appearance and size sketch;
Fig. 2 is inside and outside circular arc key diagram;
Fig. 3 is a traditional diamond-making technique batch elastic support metering report analysis result histogram;
Fig. 4 is a flow chart of the present invention;
Fig. 5 is the rough turn schematic diagram of the embodiment of the invention, and 5a is a front view, and 5b is the A-A cutaway view of 5a;
Fig. 6 is a workpiece schematic diagram behind the embodiment of the invention numerical control finish turning, and 6a is a front view, and 6b is the A-A cutaway view of 6a;
Fig. 7 is the high low temperature circular treatment of a present invention flow chart;
Fig. 8 processes the cutter path schematic diagram of three spring leafs for the present invention;
Fig. 9 is a mold schematic diagram of the present invention;
Figure 10 is the embodiment of the invention and prior art spring leaf critical size comparison diagram.
The specific embodiment
Below in conjunction with concrete example this aspect is elaborated, as shown in Figure 1, elastic support to be processed is the elastic part of duralumin, hard alumin ium alloy.Concrete structure is the heterotypic spring sheet that the annulus of Φ 40 thick 2mm connects three uniform thickness 0.425mm, and the heterotypic spring sheet has a plurality of interior circular arc and external arc as shown in Figure 2; The center director is the hollow shaft of 7mm, and the first half of hollow shaft is the conical surface of 15 degree; At first carry out the difficult point analysis:
1) elastic support is complex-shaped, and the spring leaf thin thickness is yielding, the strictness of critical size tolerance, and size Control is difficult.
2) inside and outside circular arc need process fillet with off-gauge profile milling cutter, and requires inside and outside circular arc place and plane to seamlessly transit.
3) because the demand of elastic support grows with each passing day, produce in batches, this just requires stable technology, and higher qualification rate is arranged, and the accessory size high conformity of processing.Elastic support once carried out the processing of a plurality of bouts in the past, was to adopt traditional manual processing mode always.But owing to limit by objective condition, and the part that processes, no matter be qualification rate, or quality all can not satisfy the needs of model far away.
As shown in Figure 4, elastic support numerical-control processing method of the present invention, concrete steps are as follows:
(1) treat the processing bar carry out according to the design drawing of elastic support as shown in Figure 5 rough turn, wherein, the monolateral 0.5 ± 0.1mm surplus of staying of excircle dimension, axially stay 0.75 ± 0.05mm surplus, stay technology chuck length, diameter 15 ± 0.1mm, endoporus made allowance 0.5 ± 0.01mm;
(2) workpiece that obtains after rough turn is carried out Ageing Treatment, remove stress; Be specially workpiece is put into electric drying oven with forced convection, be heated to 190 ℃ ± 5 ℃ insulations eight hours with drying box, and be cooled to normal temperature;
(3) clamp the technology chuck, the workpiece after handling through step (2) is carried out the numerical control finish turning, remove the surplus described in the step (1), and the right boring of cylindrical end face goes out six uniform miller installing holes, machine back segment technology chuck, as shown in Figure 6;
(4) workpiece after step (3) processing is carried out high low temperature circular treatment, stable workpiece size and further elimination machine add stress; Specifically as shown in Figure 7:
The first step is heated to 140～160 ℃ in electric drying oven with forced convection, be incubated 2 hours, workpiece is cooled to room temperature in air after, place SLXII moldeed depth ice chest or self-control liquid nitrogen case to lower the temperature, temperature is lower than-180 ℃ of insulations 2 hours, with workpiece as for rising again in the air to room temperature;
In second step, the above-mentioned first step is repeated once;
The 3rd step placed electric drying oven with forced convection to be heated to 140～160 ℃ workpiece, was incubated after 4～6 hours, was cooled to room temperature in air.
(5) workpiece after step (4) processing is installed in the enterprising line number control of mold finish-milling, round tool mills the interior circular arc of the spring leaf of elastic support in adopting earlier during finish-milling, adopt the external arc of the spring leaf of external arc cutter milling elastic support then, require in the milling process, three spring leaf circulations are processed, have influence on the size that had before machined with the processing of avoiding the back, and require the cutting direction unanimity of cutter at each spring leaf, three spring leaf uniformity are improved, as shown in Figure 8; Mill three fan sections between the spring leaf at last, the burr that produces when adopting the wedge angle cutter to remove milling;
The present invention can generate the numerical control program in the finish-milling process by create the threedimensional model of elastic support in CAD/CAM software, by UG software optimization cutter path, guarantees the uniformity of three spring leaf sizes in this example.
Cutting depth is not more than 0.2mm, and the finish-milling surplus is not higher than 0.05mm, and the speed of mainshaft is higher than 5000r/min, and feed speed is less than 250mm/min;
Adopt the parameter shown in the following table to carry out finish-milling in this example.
Described mold is as shown in Figure 9: comprise base 1, installation sheet 2, clamping kit 3, base 1 has the structure of triangle firm support, six miller installing holes of workpiece are fitted on the center mounting hole of installation sheet 2, installation sheet 2 is fixed on the base 1, clamping kit 3 outer rings are installed on the installation sheet, and the wedge 32 that is fixed on outer ring 31 is with Work-sheet pressing; This mold is a split-type structural, and with the convenience of raising part installation, and if go into operation later on, this mold is reusable again.
Described cutter adopts molding cutter, comprises interior round tool, external arc cutter and wedge angle cutter, and interior round tool, external arc cutter require the cutter fillet to require consistent with the inside and outside circular arc of elastic support upper spring sheet.
After in above-mentioned steps (5), removing burr, workpiece is unloaded, detection springs sheet thickness, according to testing result correction numerical control program, the control tool wear guarantees that to the influence of workpiece size the workpiece of next processing is qualified.
(6) workpiece is unloaded 15 of the finish turning elastic support hollow shaft degree conical surfaces on common fine turning lathe from above-mentioned mold.
In the actual process, before the processing of every workpiece, judge the abrasion condition of this cutter and whether needs compensate according to the measurement data of last part.
Processing result:
Go into operation altogether 21 of elastic supports, yield rate is 100%.After machining according to above-mentioned technology, be to check implementation result and statistics distribution situation, remove one and do not send outside the metering that remaining 20 finished product is taken metrological service measure, metering the results are shown in Table 2 because of one improperly sized from having detected.
Table 2 processing measured data (unit: mm)
As can be seen from the table, all in the margin of tolerance, consider not censorship 1, the part qualification rate is about 95% to the thickness of the spring leaf of 20 elastic supports of censorship, is higher than the target 85% of previous setting as critical size.In order to compare with the situation that adopts traditional diamond-making technique, the special invention front and back critical size fluctuation comparison diagram of drawing, as shown in figure 10, Tu is that higher limit, the Tm of dimensional tolerance is that size theoretical value, Tl are the lower limit of dimensional tolerance, as can be seen from the figure, and the relative prior art of the present invention, the critical size of spring leaf, the thickness fluctuation that is spring leaf is less, illustrates that processing method of the present invention can effectively control the qualification rate of critical size, good stability.
The success of this invention is carried out, and has both guaranteed the demand of each model task, gained most valuable experience for the processing of this type of part again, and be a well exercise to the technology participant, greatly improved their technical merit.Strengthened the technological reserve of correlative technology field.
The unspecified part of the present invention belongs to general knowledge as well known to those skilled in the art.
Claims (4)
1. elastic support numerical-control processing method, described elastic support are that an annulus connects three uniform heterotypic spring sheets, and the center is a hollow shaft, and the first half of hollow shaft is the conical surface; It is characterized in that step is as follows:
(1) treat the processing bar and carry out rough turnly according to the design drawing of elastic support, wherein, the monolateral 0.5 ± 0.1mm surplus of staying of excircle dimension is axially stayed 0.75 ± 0.05mm surplus, stays technology chuck length greater than 8mm, hollow shaft endoporus made allowance 0.5 ± 0.01mm;
(2) workpiece that obtains after rough turn is carried out Ageing Treatment, remove stress;
(3) clamp the technology chuck, the workpiece after handling through step (2) is carried out the numerical control finish turning, remove the surplus described in the step (1), and nose circle face right boring outside goes out six uniform miller installing holes, segment technology chuck after machining;
(4) workpiece after step (3) processing is carried out high low temperature circular treatment, stable workpiece size and further elimination machine add stress;
(5) workpiece after step (4) processing is installed in the enterprising line number control of mold finish-milling, round tool mills the interior circular arc of the spring leaf of elastic support in adopting earlier during finish-milling, adopt the external arc of the spring leaf of external arc cutter milling elastic support then, require in the milling process, milling is carried out in three spring leaf circulations, and cutter is in the milling direction unanimity of each spring leaf; Mill three fan sections between the spring leaf at last, the burr that produces when adopting the wedge angle cutter to remove milling;
In the finish-milling process, cutting depth is not more than 0.2mm, and the finish-milling surplus is not higher than 0.05mm, and the speed of mainshaft is higher than 5000r/min, and feed speed is less than 250mm/min;
Described mold comprises base, installation sheet, clamping kit, base has the structure of triangle firm support, six miller installing holes of workpiece are fitted on the center mounting hole of installation sheet, installation sheet is fixed on the base, the clamping kit outer ring is installed on the installation sheet, and the wedge that is fixed on the outer ring is with Work-sheet pressing;
Described cutter adopts molding cutter, comprises interior round tool, external arc cutter and wedge angle cutter, requires the cutter fillet to require consistent with the inside and outside circular arc of elastic support upper spring sheet;
(6) workpiece is pulled down the conical surface of finish turning elastic support hollow shaft on common fine turning lathe from above-mentioned mold.
2. elastic support numerical-control processing method according to claim 1, it is characterized in that: after in described step (5), removing burr, workpiece is unloaded detection springs sheet thickness, according to testing result correction numerical control program, the control tool wear is to the influence of workpiece size.
3. elastic support numerical-control processing method according to claim 1 is characterized in that: described step (2) Ageing Treatment is heated to 190 ℃ ± 5 ℃ insulations eight hours for workpiece is put into electric drying oven with forced convection with drying box, is cooled to normal temperature.
4. elastic support numerical-control processing method according to claim 1 is characterized in that the high low temperature circulating treatment procedure in the described step (4) is as follows:
The first step is heated to 140～160 ℃ in electric drying oven with forced convection, be incubated 2 hours, workpiece is cooled to room temperature in air after, place SLXII moldeed depth ice chest or self-control liquid nitrogen case to lower the temperature, temperature is lower than-180 ℃ of insulations 2 hours, with workpiece as for rising again in the air to room temperature;
In second step, the above-mentioned first step is repeated once;
The 3rd step placed electric drying oven with forced convection to be heated to 140～160 ℃ workpiece, was incubated after 4～6 hours, was cooled to room temperature in air.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103506816A (en) * | 2013-09-16 | 2014-01-15 | 常熟天地煤机装备有限公司 | Processing technique of planet carrier of coal cutter |
| CN105414899A (en) * | 2015-12-11 | 2016-03-23 | 湖北三江航天红阳机电有限公司 | Processing method for annular thin-walled structural component with single side cross section to be parabola |
| CN111650880A (en) * | 2020-05-15 | 2020-09-11 | 成都飞机工业（集团）有限责任公司 | Programming method for batch creation of deburring tool path based on UG/NX |
| CN112404910A (en) * | 2020-12-03 | 2021-02-26 | 贵州航天新力科技有限公司 | Processing method of fluid distribution housing |
| CN112475797A (en) * | 2020-11-13 | 2021-03-12 | 中国船舶重工集团公司第七0七研究所 | Efficient machining process method for rotor filling block |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103506816A (en) * | 2013-09-16 | 2014-01-15 | 常熟天地煤机装备有限公司 | Processing technique of planet carrier of coal cutter |
| CN105414899A (en) * | 2015-12-11 | 2016-03-23 | 湖北三江航天红阳机电有限公司 | Processing method for annular thin-walled structural component with single side cross section to be parabola |
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| CN112475797A (en) * | 2020-11-13 | 2021-03-12 | 中国船舶重工集团公司第七0七研究所 | Efficient machining process method for rotor filling block |
| CN112475797B (en) * | 2020-11-13 | 2022-12-09 | 中国船舶重工集团公司第七0七研究所 | Efficient machining process method for rotor filling block |
| CN112404910A (en) * | 2020-12-03 | 2021-02-26 | 贵州航天新力科技有限公司 | Processing method of fluid distribution housing |
| CN112404910B (en) * | 2020-12-03 | 2022-03-04 | 贵州航天新力科技有限公司 | Processing method of fluid distribution housing |
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