The treatment technology knowledge of aluminium alloy

7g/cm3. Its density is the 1/3 of iron or copper only. 2, plasticity is tall. It is good to extend a gender aluminously, can make all sorts of articles for use through the forming method such as extruding, drawing. 3, anti-corrosive. Aluminium is the metal with very strong sex of a negaive electricity, the surface falls to be able to make the oxidation film of protection in natural condition or zincous oxidation, having is better than iron and steel much corrosion resistance. 4, easy aggrandizement. The intensity of aluminium is not high, but its strength can increase after oxidizing through positive pole. 5, easy finishing. Finishing can rise further or change aluminous exterior property. Technology of aluminous zincous combustion is quite mature, the operation is stable, apply already extensively in process of aluminous goods treatment. 6, electric conduction is good, easy reclaim. What aluminous goods machines technology aluminous products is strong make 1, Leng Chong uses material aluminous bead. Use extruder stage and mould to shape, suit columnar form product or drawing technology are bad accomplished product figure, be like product of elliptical, quadrate, rectangle. (if pursue 1 machine stage, graph 2 aluminium bead, graph 3 goods) the tonnage that uses machine station and product cut area are concerned, the wall that upper mould drift and clearance of lower mould wolfram steel are a product namely is large, upper mould drift and lower mould wolfram steel press the top that adds up to the perpendicular clearance that next dead center reach when finishing to be a product namely thick. (if pursue 4) advantage: Cycle flying a model is shorter, development cost is relative drawing mould is inferior. Defect: Manufacturing process is longer, wave motion of measure of the product in making Cheng is bigger, labour cost is high. 2, aluminous skin of drawing use material. Use stage of progressive die machine and mould to undertake those who make for many times is out of shape achieve the demand of the appearance, suit to be not columnar body (aluminous material has bent product) . (if pursue 5 machine stage, graph 6 moulds, graph 7 goods) advantage: More complex stabilize with the size control in be out of shape the product makes Cheng in production for many times, product surface is more bright and clean. Defect: Mould cost tall, development cycle is relatively longer, to machine stage choose and precision demand is high. The finishing of aluminous goods 1, sandblast (gush bolus) use high speed arenaceous drifting concussion effect clears and thick the course that changes metallic face. The aluminium of this kind of method finishing can make the surface of workpiece obtains the surface roughness that certain cleanness is spent and differs, make the mechanical function of workpiece surface gets ameliorative, because this increased the fatigue resistance of workpiece, increased the adherent power between it and coating, lengthened the wear of film, also be helpful for coating flow gentle adornment. We often see this technology in the of all kinds product in malic company. 2, the function that polishing uses mechanical, chemistry or electrochemistry, make workpiece surface surface roughness is reduced, in order to obtain the treatment method of surface of shining, level off. Main component is polishing craft: Mechanical polish, chemical polish, electroanalysis polishing. Aluminous use mechanical polish + electroanalysis effect of side of stainless steel lens can is close to after polishing, this craft, give a person the sense with high-grade and contracted, fashionable future. 3, the metal that pull silk pulls silk is to use sand paper general repeatedly the production process that aluminium board blows a line. Pull silk to be able to be divided pull silk, random grain to pull silk, grain coming back to pull silk, whorl to pull silk for straight grain. The metal helps filar technology, OK and clear show trace of each subtle silk, make the extensive in metallic dumb light gives the close luster that send silk thereby, the product has both vogue and feeling of science and technology. 4, tall smooth cutting uses machine of carve of essence of life to rotate diamond knife consolidate in high speed (general rotate speed is 20000 turn / cent) cutting spare parts goes on main shaft of machine of carve of essence of life, local tall bright district arises in product surface. The brightness of cutting tall light suffers the effect of milling broach speed, broach speed jumps over the tall Guang Yueliang of fast cutting, jump over grain of knife of dark easy generation conversely. Tall smooth tall smooth cutting is in of the mobile phone in applying particularly much, be like Iphone5, in recent years rim of metal of television of partial high end used Gao Guangxi to cut craft, oxidation of together with positive pole reachs the craft that pull silk to make the sharp move that television whole was full of fashionable feeling and science and technology. 5, zincous oxidation positive pole oxidizes is the electrochemistry oxidation that points to metal or alloy, aluminium and its alloy fall in corresponding electrolyte and specific craft requirement, because the action of impressed current falls, in aluminous goods (zincous) go up the process that forms an oxidation film. Zincous oxidation not only the blemish that can solve the respect such as sex of caustic of aluminous surface hardness, wear-resisting, can prolong aluminous service life more and increase beautiful degree, already made the one ring with aluminous indispensable finishing, it is current application is the widest and very successful craft. 6, positive pole of double color of double lubricious positive pole is to show in a product aspirant travel positive pole oxidizes to gift the color with different location. Technology of double lubricious zincous combustion applies lesser in television industry, because technology is sophisticated, cost is high; But pass the contrast between double color, can reflect the high end that gives a product, distinctive outward appearance more. Reduce aluminium to machine metabolic technology measure and operation skill aluminium reason of metabolic of spare parts treatment is very much, condition of appearance of as qualitative as material, spare parts, production relative. Basically have the following sides: Semifinished product internal stress causes be out of shape, cutting force, heat in metal cutting causes be out of shape, clamping force causes be out of shape. Reduce measure of treatment metabolic technology 1, reduce Mao Pei internal stress to use nature or artificial effectiveness for a given period of time and oscillatory processing, all can eliminate the internal stress of semifinished product partly. Process the technique that also is effective beforehand. To the semifinished product of fat head big on both sides, because surplus is large, after reason is machined, be out of shape big also. If machine the spare part of semifinished product beforehand, the surplus of contractible and departmental cent, after can decreasing not only, the treatment of working procedure is out of shape, and period of time is set after be being machined beforehand, still can release one part internal stress. 2, parameter of the material of the cutting ability cutting tool that improves cutting tool, geometry has main effect to cutting force, heat in metal cutting, choose cutting tool correctly, crucial to reducing spare parts treatment to be out of shape. (1) parameter of geometry of logical choice cutting tool. The horn before ① : Below the requirement that retains edge strength, horn chooses appropriately before a few bigger, can grind a sharp point on one hand, can reduce cutting to be out of shape additionally, make a bits successful, drop cutting force and cutting temperature then. Avoid by all means uses cutting tool of the horn before losing. The horn after ② : Face of the knife after horny size is opposite after wears away reach treatment surface quality to have immediate effect. Cutting ply is the fundamental condition of the horn after the choice. When thick mill, because feed is big, cutting load is heavy, calorific amount is large, requirement cutting tool comes loose hot condition is good, accordingly, horn should choose after a few smaller. When mill of essence of life, requirement point is sharp, face of the knife after reducing chafes with what machine the surface, reduce flexibility to be out of shape, accordingly, horn should choose after a few bigger. ③ helix angle: To make milling smooth, reduce milling force, helix angle should choose as far as possible a few bigger. ④ tool cutting edge angle: Reduce tool cutting edge angle to be able to be improved appropriately medicinal powder hot condition, make the average temperature that machines an area drops. (2) improve cutting tool composition. ① reduces mill tooth to count, increase the space that hold bit. As a result of aluminium material plasticity is bigger, the cutting in treatment is out of shape bigger, need the larger space that hold bit, because this allows radius of bits bottom land,tooth of should bigger, mill is counted less had better. ② essence wears tooth. The surface roughness value of ministry of tooth cutting blade should be less than Ra=0.

4um. Before using new knife, should be with fine oilstone before tooth, from the back grind a few times gently, in order to eliminate the burr of the remain when blade wears tooth and slight toothed grain. Such, not only can reduce heat in metal cutting and cutting is out of shape smaller also. ③ controls cutting tool strictly wear away standard. After cutting tool wears away, the value increases workpiece surface surface roughness, cutting temperature rises, workpiece is out of shape increase subsequently. Accordingly, outside dividing the cutting tool stuff with choose wearability good, cutting tool wears away the standard should not is more than 0.

2mm, produce the tumor that accumulate bits easily otherwise. When cutting, the temperature of workpiece does not exceed 100 ℃ commonly, with preventing to be out of shape. 3, the Bao Bi with the clip outfit poorer to tigidity method that improves work is aluminous a workpiece, can use the following clip to install a method, be out of shape in order to decrease: ① to thin wall lining kind spare parts, if use 3 claw,place from centering chuck or bedspring first from radial clamp, once treatment hind is loose, workpiece happens necessarily be out of shape. Right now, should use the method of the impaction of axial end panel with better tigidity. With fixed position of the opening inside the spare parts, abstain to take whorl wear arbor, cover a part inside aperture, screw cap of reoccupy of end panel of impaction of a cover board is used on its the back is close. Clamp can avoid to be out of shape when the circle outside treatment, get satisfactory treatment precision thereby. When ② undertakes machining to workpiece of thin wall thin plate, had better choose vacuum sucking disk, in order to obtain distributing even clamping force, be machined again with lesser cutting dosage, can prevent workpiece to be out of shape well. Additional, still can use ram method. To increase the craft tigidity of thin wall workpiece, can be in medium of workpiece interior fill, be out of shape with reducing the workpiece in installing clip and cutting process to amount to. For example, enter to the fill inside workpiece contain 3% ～ the urea melt content of 6% potassium nitrate, after treatment, workpiece water intrusion or alcohol in, can dissolve this filler teem. 4, when cutting of high speed of reasonable arrangement working procedure, because mental allowance is big and interrupted cutting, because this milling process often produces vibration, the influence machines precision and exterior surface roughness. So, process of treatment of cutting of numerical control high speed can divide commonly for: Rough machining - semifinishing machining - clear part is machined - the working procedure such as finish machining. To the spare parts with precision high demand, need to undertake semifinishing machining 2 times sometimes, have precision work again next. After rough machining, the spare parts can cool naturally, eliminate the internal stress that rough machining produces, reduce be out of shape. The surplus that leaves after rough machining should be more than deflection, it is 1 ～ 2mm commonly. When finish machining, surface of spare parts finish machining should maintain even mental allowance, general with 0.

2 ～ 0.

5mm is advisable, make cutting tool is in smooth condition in machining a process, can reduce cutting to be out of shape greatly, obtain good appearance to machine quality, assure the precision of the product. Reduce treatment metabolic to operate skill aluminium the spare parts of material is out of shape in machining a process, besides afore-mentioned reason, in be operated actually, operation method also is very important. 1, large to mental allowance part, come loose to make its have those who had compared in machining a process hot condition, prevent concentration of quantity of heat, when treatment, appropriate uses symmetrical treatment. If have a 90mm,deep board makings need machines 60mm, after be like mill good one side instantly milling other one side, machine final measure, criterion if use,flatness amounts to 5mm; repeatedly feed semmetry is machined, every one side divides second treatment to final measure, can assure flatness to achieve 0.

3mm. 2, if there is many on plank spare parts model antrum, when treatment, unfavorable use model antrum model the order of antrum machines a method, cause a spare parts so easily to get power inhomogenous and generation is out of shape. Use statified machine for many times, each are machined at the same time as far as possible all model antrum, next administrative levels of rework the next, make the spare parts gets power equably, reduce be out of shape. 3, will reduce cutting force, heat in metal cutting through changing cutting dosage. In the 3 element of cutting dosage, amount of back penetration of a cutting tool is very large to the influence of cutting force. If mental allowance is too big, the cutting power that takes a knife is too great, can make the spare parts is out of shape not only, and still can affect the tigidity of machine tool main shaft, durability that reduces cutting tool. If reduce amount of back penetration of a cutting tool, can make produce efficiency to sell at a discount greatly again. Nevertheless, high speed milling is in CNC Machining, can overcome this one difficult problem. Reducing a back while penetration of a cutting tool is measured, want to increase feed accordingly only, increase the rotate speed of the machine tool, can reduce cutting force, assure to machine efficiency at the same time. 4, order taking a knife also wants to pay attention to. What rough machining emphasizes is to improve treatment efficiency, seek the excision rate inside unit time, can use commonly go against mill. Excise the redundant material of semifinished product surface with the the rapiddest rate, shortest time namely, form the geometrical outline that finish machining place asks basically. And what finish machining place emphasizes is high accuracy high quality, appropriate uses suitable mill. Because arrange the cutting ply of the tooth when mill from the biggest decrease successively gradually to 0, machine sclerotic degree to be reduced greatly, reduce the deformation of the spare parts at the same time. 5, when thin wall workpiece is being machined, be out of shape as a result of the generation that hold clip, although finish machining also is,avoid hard. Reduce lowermost limit to make workpiece is out of shape, can be in before finish machining is about to achieve final measure, impaction loosen, make workpiece freedom reinstates original state, next again slight impaction, allow with just can clipping workpiece to be (complete by feel) , can achieve ideal treatment result so. Anyhow, the action point of clamping force had better be on bearing face, clamping force should the way with good in workpiece tigidity function, below the premise that makes sure workpiece does not become loose, clamping force Yue Xiaoyue is good. 6, when machining belt antrum spare parts, milling cutter does not let direct like broach plunge into a spare parts downward as far as possible when treatment antrum, bring about milling cutter to allow bits space insufficient, platoon bits is not smooth, cause spare parts overheat, expand and collapse knife, break the adverse phenomenon such as the knife. Should use first be the same as dimension with milling cutter or big broach gets next tool bore, milling of reoccupy milling cutter. Or, can produce program of the knife below helix with CAM software. CNC Milling CNC Machining