Ionic nitrogen is changed and means of processing of PVD film combination applies mediumly in plastic treatment

  • Time:
  • Click:59
  • source:BERO CNC Machining
Machining plastic with elastomer material when, use ionic nitrogen to change the assorted craft processing technique with film of rigid material PVD but effective keep within limits wears away, cold welding, corrode and the problem such as material accumulation. This combination craft besides improve the appearance hardness and outside fighting chemical energy force, still can optimize intensity and tenacity to wait for function. How to when having plastic treatment, avoid to wear away, corrode and the problem that material accumulation is a key. Because this is in specific application, face of surface layer, treatment and mould surface 3 person between must reasonable match. Deposit after plasma nitriding is handled appropriate horniness film is a kind of effective method. Unit cost still can be reduced while the assorted application that plasma assists thermo-chemical treatment layer and coating is improving product performance effectively. In the meantime, use efficient way to undertake to applying at the tool surface of plastic treatment domain modified also has become more and more general. And successful key depends on whether reaching its surface character to have proper understanding to the tool. And the chemical reaction situation that mechanical equipment and mould create a state to be able to affect plastic material and tool surface directly in plastic treatment application. Nitriding of craft characteristic plasma is a kind of very efficient heat treatment way that makes interfacial film layer. The nitrogen in glow discharge plasma diffuses in entering velar layer, enhance workpiece surface hardness thereby. Processing workpiece is waited for to be cathode in process, connect hydric the gas mixture that reachs nitrogen, bias voltage is applied to positive pole below hundreds volt and 50~500Pa pressure. Cathode situation falls in, because matrix surface temperature is as high as 450 ℃ above, azotic ion is obtained quicken and bump matrix surface thereby tool of azotic element infiltration is in-house. Can form through this kind of means contain iron or the layer of nitride chemical combination that chromic, molybdenum, aluminium reachs magnesium to wait and diffusion layer. Its surface hardness can amount to 1000HV, taller even. Normally workpiece surface basically is to be said to regard the iron nitrification of white layer as content. Azotic content can undertake modulatory according to applying need, the horniness material coating that so that be sequel,restrains completely even creates better exterior condition. Generated diffusion layer comes from workpiece surface the hardness of a few millimeter reduces core very gently. In respect of film of industrialized deposit horniness, electric arc evaporates craft because the position with be being held its are simple and convenient and very significant. In process, film metal is in because of the electric arc that produces exterior border moves quickly and obtain evaporate, ionization, negative bias circumstance is connected to fall in workpiece batholith, metallic ion bumps workpiece quickly. Electric arc evaporates craft is pure use physical method to make the metal evaporates, and do not include any intermediary volatile compound, because this is a kind of typical PVD (deposit of physical gas phase) craft. Contain nitrogen through adding or contain carbolic gas, can form nitride and carbide metal film. Film has function of very tall small hardness, low attrition and very good chemical laziness. It is when craft temperature normally when 180 ℃ above, can win the film of high quality. Accordingly, PVD craft also can apply to cementite steel. Nitrogen is changed and the characteristic of coating technology makes the workpiece that amounts to 4m to overall length undertakes assorted handling becoming a possibility. In the meantime, still can combine processing diameter 1.

The big package of 2m of 5m, length. The tool exhaustion choice when material and heat treatment type change workpiece face with actor when fighting abrasiveness to be able to be a purpose, the hardness of material of core of attaint of constant regular meeting, because this workpiece forms the break of certain level and damaged easily. Ionic nitrogen is changed as method of heat treatment of a kind of attrib border layer, make attrib border layer tall of hardness and core toughness hold concurrently become a possibility. Change technology according to material and nitrogen, exterior hardness can achieve 1000HV above. Nitrogen changes the deepness of hardness to be able to pass craft temperature and time to undertake modulatory, according to its requirement deepness can arrive from a few micron a few millimeter. The mix into of a large number of nitrogen is entered make remains arises to press stress in attrib border layer. Come from the outside hand in change here the static state presses load overlay over stress. The tensile stress that arises on border is reduced. Same, displacement of the greatest leftover tensile stress comes the interstitial not sensitive and in-house area of package. The result curves the fatigue intensity below stress to increase reversely. Because the model wears away,wear away the tall hardness of grain, ionic nitrogen is changed do not provide abiding to tatty protection. Of PVD horniness film microscopical hardness is as high as 2000HV over, accordingly special agree with miniature cutting. Object of macroscopical big grain has horniness normally tall brittleness feature, small fall to break easily in fatigue state, bear the weight of till enough till fatigue bear. For example, window glass is brittleness and easy be damaged, and fibre glass is flexible however, because this often is used at improving the strength of plasticity material. In practice, lesser horniness grain is had taller fight wear away ability. In great machine the circumstance of stress falls, ionic nitrogen is changed and the assorted processing of horniness coating shows huge advantage, because the surface is sufficient sclerotic material may produce plasticity to be out of shape, and the likelihood is pressed into basic level material. Ionic nitrogen is changed and coating craft fights break to wear away for workpiece the improvement of ability, and obtained the horniness face that has core tenacity to create a condition. Workpiece tenacity passes sclerotic craft to obtain, after undertaking nitrogen changes processing hardness increases 1000HV. Hardness grade of the surface is decided directly by film. Wear away for effectively keep within limits, use horniness film normally, the hardness that compares typical horniness grain normally because of their hardness is big. Ionic nitrogen is changed and surface of groove of mould of OK and effective keep within limits is machining the assorted processing means of CrN film fibre glass content is very high plastic when wear away phenomenon (see a picture 1) . This case is use at containing polyamide of material of 35% fibre glass (PA) the Injection Mold Tooling that material makes case character. Very short time is immanent the work area noting model that does not have film appeared bedding face accumulates erosive phenomenon. This tool shapes by what cold heat makes steel material model, mold insert and nozzle composition. Graph 1 use at treatment to contain polyamide of 35% fibre glass the Injection Mold Tooling of material qualitative casing, be changed through ionic nitrogen and CrN is multilayer hardness of the surface after coating combination handles single component to be changed through plasma nitrogen can achieve 700HV1 over (diamond pyramid hardness) . Nitrogen changes deepness to depend on chromic content, interpose at 0.

15~0.

Between 3mm. Ionic nitrogen changes craft temperature to answer to be heated up in order to avoid under the temper temperature of heat treatment steel be out of shape or of matrix hardness reduce. Later, mold insert also had horniness film. Film is normally multilayer structure, ply > 6 μ M. This kind multilayer structure but keep within limits machines what the likelihood when PA happens to corrode spread. Below a lot of circumstances, maintain specific exterior quality, its specific aim each are not identical. Machine for example when fibre glass is plastic, the surface needs to have fight abrasiveness very well can. Below this kind of circumstance, we undertook to heating up steel workpiece ionic nitrogen changes the assorted processing with film. Through the appearance that polishing handles, its surface roughness can achieve Rz<1Rz. From the point of the exterior, such exterior glossiness is admirable, this is crucial to reflector workpiece treatment (see a picture 2) . Means of this combination processing ensured the tall stability of glossiness is reached durative. Contaminant is OK also by easily won't right from exterior purify the surface causes damage. Graph the 2 patterns that are used at machining reflector, change through ionic nitrogen, the feature that CrN film and polishing processing reduce coefficient of friction to note model craft is the surface that be enclothed often and opens sunken model, because this answers to reduce the attrition that sells needle and slide block as far as possible, can increase the difficulty that lubricate and safeguards otherwise. Below a lot of circumstances, must avoid completely to use traditional lubricant, suck the component that note a pattern with preventing lubricant to coil. Accordingly, the appearance that produces opposite clash often uses dry type lubricant. A kind of circumstance is: Superstratum W-C:HThe one fraction of film transfers opposite metallic layer, it is to do lubricant and its oneself to chafe each other actually namely. Have any attrition hardly, also can produce any wearing away scarcely. Steel structure directs selling needle and slide block is W-C:H mediumlyThe representative application case of film. The gear that will visit area of the drive on plastic treatment machine again or spline axis are in film is the following expression: Pass W-C:HFilm, can avoid small corrode and teeth of a cogwheel to burst apart prematurely. Come so, gear still can play movement in low noise condition. As a result of the improvement to fatigue intensity, pinion can realize bigger torque, service life also is lengthened greatly. Splash in shooting technical process, temperature is OK and opposite inferior. The pinion of cementite also can use W-C:H of dry lubricant typeFilm, and the hardness that won't damage nuclear duramen expects. The interior of agent of the water portion that corrodes the remain in producing the reason that corrodes a likelihood to include resin, drawing of patterns and plasticity material oneself is corroded. To prevent to corrode, use the data of tall alloy normally; On the other hand, tool cost and finished cost are higher; Moreover, antirust and acid resistant material hardness is normally inferior, when be worn away anti-wear properties is lesser. Accordingly, want to realize anticorrosion, other property are sure can be affected. Use the material with chromic higher content to undertake ionic nitrogen is changed also be not optimal program, because the hardness of expectation was achieved, anticorrosive function was reduced however. When undertaking plasticity material is machined, uses material type is different, its corrode degree to also differ. After ionic nitrogen is changed, nitride of translate into of free chromic element, of material fight chemical function to win improvement accordingly. Can come through combining processing technology the break that keep within limits belongs to electrochemistry to corrode a type is corroded. Horniness film itself is corroded not easily normally, because this can carry deposit as far as possible compact film will decrease corrode odds. The compound coating of the Cr layer of different chromic content and CrN layer, because provided screen function and be become more or less for matrix,reduce one of contributory cause that chemistry corrodes. Finally, the actor bad that corrodes protective function still depends on it is OK to create corroded material the degree of hole of miniature of the remain in infiltration film. PVC material is in treatment process cause one of cankerous typical case by the chemical attribute of plasticity material oneself. PVC material forms chloridize hydrogen after rolled steel surface is decomposed by catalysis, produce reaction with the water portion that remains in plasticity material next, form hydrochloric acid to be caused to rolled steel surface thereby corrode. Because agglutinant and plastic cannot enter CrN multilayer in the miniature hole of film, PVC catalysis decomposes what cause to tool steel to corrode be broken by block, prevented effectively to corrode thereby. CrN is multilayer the applied example of film includes worm, thin plate to shape tool or helix alloter (see a picture 3, 4) . Base material often uses nitrogen to convert steel. Change processing through original nitrogen, after having film next, the influence that break corrodes is reduced, the anti-wear properties of base material can be obtained increase. Graph 3 use ion nitrogen is changed and PVD CrN is multilayer the worm of film, use at PVC extruding to because contain a lot of covalent bond,process film of material accumulation horniness normally expression is tall laziness. Accordingly, horniness film produces chemical reaction not quite easily with other solid, build up not quite easily also plasticity deposit. Often be in plastic on discover material accumulation phenomenon from make clear on the other hand plastic with fusible reaction produced between rolled steel. Typical applied example is polycarbonate (the treatment of PC) material. Get together carbonic acid fat replaces glass in increasing ground. In liquid PC treatment, model changes tool and sunken model surface to form plasticity to pile up easily. These deposit flake often, cause pollution to patternmaking product thereby. This increased percent defective and protect workload character. Graph 4 CrN is multilayer film shapes mould, of the deposit in carrying out experience to confirm TiN film can avoid PC material to machine with what come for years at PVC extruding treatment form (see a picture 5) ensure thereby the success that machines a process. Matrix uses Leng Zungang of 2 class heat treatment or nitrogen to change steel to be able to be offerred for film prop up very well. Be out of shape to prevent heat, the craft temperature of 250 ℃ can be used in film process. Screw of film of graph 5 TiN, use at PC to note model to be in the treatment process of elastomer, often meet those who discover traditional horniness film to fight sticking function is not very ideal. Tall agglutinant deposit often can handle way through much machinery only, if gush is arenaceous,craft comes purify. On the tool wearing away is not by what note model or vulcanization craft itself to cause, cause by the clean craft of these high strenth however. Ionic nitrogen is changed and the assorted processing means of film forms what defer deposit greatly, in ensuring the appearance of sunken model handles a process in cleanness of high strenth machinery, be protected. Already developed new-style CrN at present base film will improve accumulation appearance further. Different point is so that reduce exterior energy,proper other element is added on traditional coat foundation. Be aimed at certain and specific application requirement, can become this new-style coating design without structure of constituent crystal surface. Such surfaces will be particularly slick, because individual and columnar the microcosmic surface roughness that the different increase rate of crystal causes is restricted. In the meantime, the surface is microcosmic of surface roughness reduce the odds that reduced mechanical lock to decide further. This are new-style coating is confirmed to have first-rate effect in a lot of application circumstances. Normally the circumstance falls, can use this kind of film to reduce the accumulation phenomenon of material greatly. Processing was changed to be offerred for coating to the ionic nitrogen of material before coating prop up advantageously. In the meantime, avoided high strenth machinery to clean the craft destruction to tool appearance. CNC Milling CNC Machining