The emulation of lamina of typical spare parts is machined

Time:2023-06-20 14:30:59
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source:YIGAN CNC Machining

The high speed of blade a representative application that 5 axes milling is technology of high speed cutting, this literary grace undertakes to blade with CATIA entity builds a model, the basis machines the material characteristic of blade, the cutting tool with logical choice undertakes machining; basis the appearance characteristic of blade, choose sound process designing strategy, take cutter track diameter and kind of knife of advance and retreat, software of final application PowerMill undertakes emulation machining. Key word: Lamina of typical spare parts emulates the treatment rapid development as science and technology, make in machinery in, like blade the treatment capacity of component of such complex curved surface grows day and day, be in real products plan and in making, constant regular meeting encounters such free curved surface. These curved surface cannot express with clear mathematical expression, often give out only on the design information of a few disperse. Article application CATIA undertakes building a model to blade, get an ideal three-dimensional lamina substance, undertake undertaking emulate and be machininged with PowerMILL after. One, of blade build a model to undertake actual mapping to the lamina of a fan, undertake to fan according to the result application CATIA of mapping three-dimensional substance builds a model. To make sure follow-up treatment work undertakes smoothly, the quality that makes sure CATIA builds a model is very important segment. If be in molding process, the curved surface curvature of blade is discontinuous, appeared sharp drop, the knife can appear in machining a process or jump the phenomenon of the knife, affect the treatment precision of blade surface. If be in blade modelling, the curvature change of blade curved surface is acuteness, with respect to the cutting tool contrail that can produce sharp change, increase a knife to have the impact to workpiece, also can reduce the treatment quality of blade surface. The basic course that blade builds a model is below. Build the disc part among blade above all, draft is built in YOZ plane, if pursue 1. Next 1 draft is to in an attempt to bus, circle Z axis to undertake gyral, make its become entity of a cylindroid, if pursue 2. Apply batten curve to have a description to the edge taking energy of life of blade and exhaust edge again, the reference point that uses 3 batten curve controls the curvature of batten curve, if pursue 3 with the graph 4. After two edges of blade are built, with blade was reference with basic plane, build referenced plane. The 3rd referenced margin is made on referenced plane, if pursue 5. Build a curved surface through these 3 curves, add to this curved surface thick, if pursue 6. Reentry pours horny nap all right, if pursue 7. Build good lamina to this, undertake the array of 3 120 ° , if pursue 8. Have part to the root ministry of blade, avoid midpoint of occurrence stress collect, if pursue 9. Curvature of the oldest law is the blade face that gets right now 0.

875, if pursue 10. Nextpage 　 2, the choice of cutting tool and comparing 5 coordinate CNC Machining is to show 5 coordinate of main shaft of numerical control machine tool and workbench do line form interpolation to move at the same time, make cutting tool walks along the dimensional contrail that the knife asks, complete the treatment of corresponding and complex curved surface. Crop establishs milling cutter photograph of 3 coordinate CNC Machining compares CNC Machining of 5 coordinate Duan Xi and ball head knife, respective main good point depends on the following respects. 1.

Add what work efficiency leads to be in quite equal below the circumstance of rudimental height and cutting tool radius, CNC Machining of mill of 5 coordinate end takes knife step pitch big, machine efficiency thereby tall, this to blade the spare parts treatment of such free curved surface has very important sense, answer to choose crop milling cutter as far as possible in rough machining process. Cursory consideration, the efficiency that uses 5 coordinate to carry mill is equivalent to ball head knife the 3 times above of efficiency of 3 coordinate treatment. Accordingly, below the premise that has 5 coordinate linkage, answer to use crop milling cutter to machine curved surface as far as possible. 2.

Because the comparison that machines exterior quality is opposite with ball head milling cutter when blade surface undertakes machining, ball head knife to blade surface be go approaching with spherical motion. Using the knife that carry mill to machine blade curved surface is the campaign including sth resembling a net that uses plane approach treat treatment lamina surface, and still can assure to machine bit of place to all be high speed cutting, it is better to have accordingly and consistent exterior quality. In the meantime, the cutting tool choice in blade treatment is stricter. When choosing cutting tool, the material of semifinished product of Lv of take an examination, machine tool, cutting dosage that allow, tigidity and durability, precision asks and machine the element such as level, commonly used cutting tool has process of milling of blade numerical control ball head knife and Duan Xi knife. 3.

Cutting tool life is in blade treatment process, when using ball head knife to undertake milling to blade, milling cutter axes is in feed plane just carried out forward bend up with feed of inclined proper point of view drag cut, the opposite life of cutting tool is highest, and exterior surface roughness also is reduced greatly, if pursue 11. 3, the chooses blade complex curved surface of mode taking a knife makes treatment process locates hard and search, and changeful form. Consider pattern of a few kinds of footpath integratedly, helix walks along a knife to machine is the best pattern that blade takes a knife, if express 1. Its advantage depends on: ① reduces the number that hold clip, because repeat fixed position and the man-hour; ② that search to waiting for working procedure and waste in great quantities to machine orbit,saved successive, it is good to suit high speed to machine; ③ to machine quality, treatment efficiency is tall. Applied PowerMill has helix precision work to blade, central position presses computation of position of semifinished product center. The setting of helix radius is to use those who determine pattern of the helix when blade cutting to begin radius of radius and end, when beginning radius and end radius to use control lamina milling, the athletic way of the appearance of helix design and cutting tool. When beginning radius to be less than end radius, blade treatment corkscrewed yarn is the; from indrawn and extra work when beginning radius to be more than end radius, criterion blade treatment corkscrewed yarn is from the treatment inside extroversion. Because blade adds man-hour, answer to machine the denotative ministry of blade first, the root ministry of blade is machined after, with reducing blade be out of shape, means of a kind of treatment after the choice answers in machining a process so, namely from the treatment inside extroversion. Polygonal public errand is to use the parameter of accuracy of design of the helix in deciding cutting tool is machining blade process, setting polygon common difference is so less, criterion helix design jumps over approximate Yuajimide corkscrewed yarn. Directional option is the athletic way that uses affirmatory cutting tool, to assure to arrange mill, choose clockwise treatment. Nextpage 　 4, the milling force that blade machines, milling temperature and exterior surface roughness the article with LF5 and 6063T6 material of two kinds of aluminium alloy is a high speed milling that has blade to analyse. 1.

Rotate speed by if pursue 12 can see, in blade treatment process, when lamina of applied LF5 aluminium alloy is machined, revolution is in 12000 ～ 18000r/min and force of the cutting when 24000 ～ 30000r/min are the smallest, when lamina of applied 6063T6 aluminium alloy is machined, revolution is mixed in 18 000r/min of 12 000 ～ force of the cutting when 36 000r/min of 30 000 ～ is the smallest. 2.

Cut be like a graph greatly with feed 13 with the graph 14 are shown, when application FT5 material undertakes blade adds man-hour, cut deep choose respectively 0.

5mm or 2.

5mm, criterion feed is in 0.

Force of the cutting when 2mm/z is the smallest, when application 6063T6 material undertakes blade adds man-hour, cut deep choose respectively 0.

5mm or 2.

5mm, criterion feed chooses 0.

05mm/z or 0.

Force of the cutting when 2mm/z is the smallest. 3.

Step pitch is in blade treatment process, because be right,aluminium alloy material undertakes machining, step pitch is not so remarkable to the influence of cutting temperature, if pursue 15. When machining blade, big step pitch is helpful for dropping cutting temperature, also be helpful for improving manufacturing efficiency. 4.

Cutting deepness is shown 16 times like the graph, in application FT5 undertakes blade adds man-hour, cut difficult choice 2.

5mm is better. In application 6063T6 undertakes blade adds man-hour, cut difficult choice 1.

5mm surface surface roughness is best. 5, applied PowerMill undertakes emulation machining the analysis according to above, read in the blade model that has built in CATIA above all, if pursue,17 are shown. Define the semifinished product of blade next, undertake through PowerMill optimal semifinished product is calculated, if pursue,18 are shown. Make craft card according to the analysis in front again (it is exemple) with LF5, if express,2 are shown. The graph shows the emulation for rough machining 19 times, if the emulation that helix of semifinishing machining application machines pursues 20 are shown, the method taking a knife of finish machining is shown 21 times like the graph. The article basically introduces Nextpage 　 to machine the technology issue in the process and the means of settlement that encounter a problem in machining a process in blade. According to the typical sex of blade spare parts, the method such as 5 axes treatment solved applied high speed blade treatment is out of shape mediumly problem, fixed position problem and treatment quality problem, basically discussed high speed treatment to process medium actual application in blade. The material that article treatment lamina chooses is LF5 and 6063T6 material of two kinds of aluminium alloy, the to aluminium alloy experiment parameter in drawing lessons from other high speed to process data and conclusion, had development in the light of the treatment of blade appearance spare parts of aluminium alloy discuss and study. The data of two kinds of aluminium alloy that passes make choice of makes blade, consider from the exterior quality respect of cutting force, heat in metal cutting and cutting, optimized cutting parameter, make blade reachs cutting mass while, improve the manufacturing efficiency of blade. CNC Milling CNC Machining