CN102179708B - Multipoint profiling rigid clamp and method for processing thin-wall workpiece by using same - Google Patents

Multipoint profiling rigid clamp and method for processing thin-wall workpiece by using same Download PDF

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Publication number
CN102179708B
CN102179708B CN 201110056204 CN201110056204A CN102179708B CN 102179708 B CN102179708 B CN 102179708B CN 201110056204 CN201110056204 CN 201110056204 CN 201110056204 A CN201110056204 A CN 201110056204A CN 102179708 B CN102179708 B CN 102179708B
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China
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vacuum
workpiece
processing
chuck
machined
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CN 201110056204
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Chinese (zh)
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CN102179708A (en
Inventor
王义强
华顺明
王晓军
郑堤
王龙山
楼应侯
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浙江大学宁波理工学院
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Abstract

The invention discloses a multipoint profiling rigid clamp, comprising a clamp body. The clamp body is provided with a positioning surface for positioning a processed workpiece; the positioning surface is provided with a vacuum sucker; the clamp body is internally provided with a vacuum hole channel; one end of the vacuum hole channel is connected with the vacuum sucker, and the other end of the vacuum hole channel is connected with a vacuum valve island arranged at the outer part of the clamp body; the vacuum valve island is connected with a vacuum system connected with a control system; and the vacuum hole channel is also connected with the control system by a vacuum sensor. A method for processing a thin-wall workpiece by using the multipoint profiling rigid clamp comprises the steps of: modeling, analyzing, determining and optimizing key positioning points, arranging the vacuum sucker, processing the positioning surface of the clamping body and finally carrying out processing on the thin-wall workpiece. The multipoint profiling rigid clamp is used for a high-speed milling finish processing stage of the complex profile of the thin-wall workpiece, the positioning surface of the clamp is consistent to the surface type of the processed workpiece, the uniform distribution of a clamping force is guaranteed and the clamping and the deformation of the thin-wall workpiece are avoided.

Description

Multiple spot profiling rigidity fixture and use the method for the processing thin-walled workpiece of this fixture
Technical field
The present invention relates to the precision cutting process technology of composite material thin wall part, a kind of method that especially relates to multiple spot profiling rigidity fixture and use this fixture processing thin-walled workpiece under condition of high speed milling.
Background technology
Advanced composite material (ACM) is with its high specific strength, high ratio modulus and low thermal coefficient of expansion, extensive use in the fields such as Aeronautics and Astronautics, automobile, medical science.Simultaneously, adopt the modes such as control of two-dimensional braided, three-dimension integrally braiding, local reinforcement and filling, can effectively guarantee the smooth transition of reliable delivery and the rigidity of load, material and structure are fully used.Therefore, composite has become after aluminium, steel, titanium, the fourth-largest Aircraft Structure Materials that emerges rapidly.Ceramic matric composite (CMC) particularly C/SiC composite is the research emphasis of Aero-Space high-temperature structural material in the world today.
In order to adapt to the precision optical machinery processing request of complexity Noodles composite material parts, improve crudy and working (machining) efficiency, adopt high speed/ultrahigh speed numerical control milling machine tool (〉=5 axle) to become main flow from now on.High-speed milling processing (HSM) but decrease cutting force (average more than 30%), smear metal is discharged at a high speed, take away a large amount of heat in metal cutting (〉=90%), the heat of passing to workpiece significantly reduces, and internal stress and thermal deformation are little, improves machining accuracy, and there is not the instrument hardness decline of rising and causing due to cutting temperature, significantly extend life tools, machined surface quality can realize mirror finish.
It is distortion of workpiece that thin wall component, particularly composite material thin wall part, high-speed milling add man-hour distinct issues, affects the surface precision of workpiece.Next is vibration problem, directly affects the surface roughness of workpiece.And the diversity of composite has determined that it has diversified mechanical behavior feature, and its processing technology, machining condition and clamping method (holding method) have different from traditional metal material more.For this reason, Chinese scholars has been done a lot of research work, and has developed corresponding technological equipment.Take comb core material as example: cutting technique has emery cutter cutting, high pressure jer cutting, laser cutting, Technology of High-speed Numerical-control Manufacturing etc.; Clamping method mostly is bonding fixing, and as polyethylene glycol method, double-sided adhesive tape method, vacuum suction method etc., bond effect is not good and follow-up cleaning difficulty is large.The Ke Yinglin of Zhejiang University professor team has researched and developed the holding method based on high-intensity magnetic field and tribology principle, has made curved surface fixing platform and the auxiliary packing equipment of plane machining fixing platform, complexity Noodles cellular material processing use, and success for the production of.
Summary of the invention
In order to solve the not enough problem with vibrating of rigidity in the thin-wall workpiece process, improve machining accuracy and surface quality, a kind of method that the invention provides multiple spot profiling rigidity fixture and use the processing thin-walled workpiece of this fixture.
An aspect of of the present present invention is to provide a kind of multiple spot profiling rigidity fixture, and the technical scheme that adopts is,
Multiple spot profiling rigidity fixture, comprise chuck body, be provided with the locating surface for the location workpiece to be machined on described chuck body, be provided with vacuum cup on this locating surface, chuck body inside is provided with the vacuum duct, and vacuum duct one end is connected with vacuum cup, the other end is connected with the vacuum valve island that is arranged at the chuck body outside, the vacuum valve island is connected in vacuum system, and vacuum system is connected with control system, and the vacuum duct also is connected in control system by vacuum transducer.
Be provided with vacuum hole on described vacuum cup, vacuum hole is connected with work nest on vacuum cup.
Another aspect of the present invention is to provide a kind of method of using the processing thin-walled workpiece of above-mentioned multiple spot profiling rigidity fixture, and the technical scheme that adopts is,
Use the method for the processing thin-walled workpiece of above-mentioned multiple spot profiling rigidity fixture, comprise the following steps,
(1) modeling and analysis.Set up the three-dimensional CAD physical model of workpiece to be machined; The planning cutter path generates the CAM program, machining simulation process, and sophisticated model; Extract the processing profile, carry out the finite element analysis of workpiece force and deformation in the high-speed milling process according to cutter path, again improve and revise model.
(2) determine and optimize crucial anchor point.According to the results, in main force and deformation zone, determine position and the quantity of the crucial anchor point of workpiece to be machined, and optimize distribution, at work nest and the vacuum hole of crucial locating point position processing sucker.
(3) vacuum cup is set.According to the composite type of workpiece to be machined, estimate total cutting force size, determine structure, the form of vacuum cup, determine the spread pattern of vacuum size and vacuum cup;
(4) clamp for machining body locating surface.Require to carry out locating surface design and the processing of chuck body according to the final profile of workpiece to be machined, reserve the surplus of 0.005 ± 0.001mm after the locating surface processing of chuck body, after treating that other parts of chuck body process, whole locating surface is carried out last finished machined;
(5) workpiece processing.Workpiece to be machined is arranged on multiple spot profiling rigidity fixture, by the manual pre-determined bit of workpiece, vacuum clamping, fast detecting and diagnosis, mistake clamps prediction and control, and clamping process is confirmed, the processing beginning, the process of clamped condition exception monitoring and processing is until process finishing.
The invention has the beneficial effects as follows, this multiple spot profiling rigidity profiling jig is used for the high-speed milling fine finishining stage of thin-wall workpiece complex profile, one mould, fixture locating surface and work piece face type are in full accord, guarantee that clamp force distribution is even, avoid clamping distortion, solve rigidity deficiency and vibration problem in workpiece process, improve machining accuracy and surface quality, can reduce the distortion of workpiece in process, reduce vibration, thereby improve surface precision and surface roughness after processing; The raising of multiple spot profiling rigidity fixture installed surface rigidity makes the rigidity of manufacturing process system be improved, after process parameter optimizing, can adopt higher cutting speed, reduce the cutting region temperature, thereby further improve working (machining) efficiency and tool life, cut down finished cost.
Description of drawings
Fig. 1 is the structural representation of multiple spot profiling rigidity fixture of the present invention;
Fig. 2 is the structural representation of vacuum cup in Fig. 1.
The specific embodiment
For technological means, creation characteristic that the present invention is realized, reach purpose and effect is easy to understand, below in conjunction with diagram and specific embodiment, further set forth the present invention.
As shown in Figure 1, the multiple spot profiling rigidity fixture that the present invention proposes comprises chuck body 100, be provided with the locating surface 101 for the location workpiece to be machined on described chuck body 100, be provided with vacuum cup 110 on this locating surface 101, chuck body 100 inside are provided with vacuum duct 120, vacuum duct 120 1 ends are connected with vacuum cup 110, the other end is connected with the vacuum valve island that is arranged at chuck body 100 outsides, the vacuum valve island is connected in vacuum system, vacuum system is connected with control system, and vacuum duct 120 also is connected in control system by vacuum transducer.
As shown in Figure 2, be provided with vacuum hole 111 on described vacuum cup 110, vacuum hole 111 is connected with work nest 112 on vacuum cup.
In the present embodiment, use the method for the processing thin-walled workpiece of above-mentioned multiple spot profiling rigidity fixture, comprise the following steps,
(1) modeling and analysis.Set up the three-dimensional CAD physical model of workpiece to be machined; The planning cutter path generates the CAM program, machining simulation process, and sophisticated model; Extract the processing profile, carry out the finite element analysis of workpiece force and deformation in the high-speed milling process according to cutter path, again improve and revise model.
(2) determine and optimize crucial anchor point.According to the results, in main force and deformation zone, determine position and the quantity of the crucial anchor point of workpiece to be machined, and optimize distribution, at work nest and the vacuum hole of crucial locating point position processing sucker.
(3) vacuum cup is set.According to the composite type of workpiece to be machined, estimate total cutting force size, determine structure, the form of vacuum cup, determine the spread pattern of vacuum size and vacuum cup;
(4) clamp for machining body locating surface.Require to carry out locating surface design and the processing of chuck body according to the final profile of workpiece to be machined, reserve the surplus of 0.005 ± 0.001mm after the locating surface processing of chuck body, after treating that other parts of chuck body process, whole locating surface is carried out last finished machined;
(5) workpiece processing.Workpiece to be machined is arranged on multiple spot profiling rigidity fixture, by the manual pre-determined bit of workpiece, vacuum clamping, fast detecting and diagnosis, mistake clamps prediction and control, and clamping process is confirmed, the processing beginning, the process of clamped condition exception monitoring and processing is until process finishing.
This multiple spot profiling rigidity profiling jig is used for the high-speed milling fine finishining stage of thin-wall workpiece complex profile, one mould, fixture locating surface and work piece face type are in full accord, the assurance clamp force distribution is even, avoids clamping distortion, solves rigidity deficiency and vibration problem in workpiece process, improve machining accuracy and surface quality, can reduce the distortion of workpiece in process, reduce vibration, thereby improve surface precision and surface roughness after processing; The raising of multiple spot profiling rigidity fixture installed surface rigidity makes the rigidity of manufacturing process system be improved, after process parameter optimizing, can adopt higher cutting speed, reduce the cutting region temperature, thereby further improve working (machining) efficiency and tool life, cut down finished cost.
Above demonstration and described basic principle of the present invention, principal character and advantage of the present invention.The technical staff of the industry should understand; the present invention is not restricted to the described embodiments; that describes in above-described embodiment and specification just illustrates principle of the present invention; the present invention also has various changes and modifications without departing from the spirit and scope of the present invention, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.

Claims (1)

1. the method for the processing thin-walled workpiece of multiple spot profiling rigidity fixture, is characterized in that, comprise the following steps,
(1) set up the three-dimensional CAD physical model of workpiece to be machined; The planning cutter path generates the CAM program, machining simulation process, and sophisticated model; Extract the processing profile, carry out the finite element analysis of workpiece force and deformation in the high-speed milling process according to cutter path, again improve and revise model;
(2) according to the results, in main force and deformation zone, determine position and the quantity of the crucial anchor point of workpiece to be machined, and optimize distribution, at work nest and the vacuum hole of crucial locating point position processing sucker;
(3) according to the composite type of workpiece to be machined, estimate total cutting force size, determine structure, the form of vacuum cup, determine the spread pattern of vacuum size and vacuum cup;
(4) require to carry out locating surface design and the processing of chuck body according to the final profile of workpiece to be machined, reserve the surplus of 0.005 ± 0.001mm after the locating surface processing of chuck body, after treating that other parts of chuck body process, whole locating surface is carried out last finished machined;
(5) workpiece to be machined is arranged on multiple spot profiling rigidity fixture, by the manual pre-determined bit of workpiece, vacuum clamping, fast detecting and diagnosis, mistake clamps prediction and control, and clamping process is confirmed, the processing beginning, the process of clamped condition exception monitoring and processing is until process finishing;
described multiple spot profiling rigidity fixture, comprise chuck body, be provided with the locating surface for the location workpiece to be machined on described chuck body, described locating surface and work piece face type are in full accord, be provided with vacuum cup on this locating surface, chuck body inside is provided with the vacuum duct, vacuum duct one end is connected with vacuum cup, the other end is connected with the vacuum valve island that is arranged at the chuck body outside, the vacuum valve island is connected in vacuum system, vacuum system is connected with control system, the vacuum duct also is connected in control system by vacuum transducer, be provided with vacuum hole on described vacuum cup, vacuum hole is connected with work nest on vacuum cup.
CN 201110056204 2011-03-09 2011-03-09 Multipoint profiling rigid clamp and method for processing thin-wall workpiece by using same CN102179708B (en)

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CN102615520A (en) * 2012-03-30 2012-08-01 浙江大学宁波理工学院 Composite material thin-walled piece clamp and method for processing composite material by using clamp
CN103252623A (en) * 2013-05-14 2013-08-21 湖南湖大艾盛汽车技术开发有限公司 Machining method using vacuum sucker to clamp thin-walled piece with variable wall thicknesses
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CN104384825B (en) * 2014-08-01 2017-02-01 中国人民解放军第五七一九工厂 Machining deformation control method of bushing thin-wall part
CN104111625B (en) * 2014-08-22 2016-10-12 南京航空航天大学 A kind of thin wall special-shaped part clamping deformation actively processing method
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CN104841991A (en) * 2015-05-05 2015-08-19 柳州三农科技有限公司 Machining method of H-shaped thin-wall parts
CN104841989A (en) * 2015-05-05 2015-08-19 柳州三农科技有限公司 Machining method of H-shaped thin-wall parts
CN105127786A (en) * 2015-10-13 2015-12-09 太仓市和准电子科技有限公司 Clamping jig used for thin-walled workpiece
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CN106312460B (en) * 2016-09-27 2018-05-11 北京航天新风机械设备有限责任公司 Flatness is less than the carbon fiber magnesium-based composite material thin plate processing method of 0.2mm
CN109581971A (en) * 2017-09-28 2019-04-05 中国商用飞机有限责任公司 The deformation control method of aircraft entirety escape door numerical control processing
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