Plastic pattern provides polishing means

Polish of machinery of 1 mechanical polish is to rely on plasticity of surface of cutting, material to be out of shape take out gets the polishing means of flowing face by the protruding ministry after polishing, general use oilstone, abb annulus, sand paper, give priority to with manual operation, special spare parts is like swing tower surface, can use the auxiliary tool such as revolving stage, exterior quality requirement can be used high exceed essence of life to grind the method that cast. Exceed essence of life to grind casting is to use grind tailor-madely, grind in what contain abrasive in throwing liquid, press closely in workpiece to be machined apparently, make high speed whirligig. Use this technology to be able to achieve Ra0.

The exterior surface roughness of 008 μ M, it is all sorts of polishing methods in highest. Optical lens mould often uses this kind of method. 1.

2 chemistry cast actinic polish is to let material be in chemical medium the part with microcosmic and bulgy surface is sunkener the part is preferential and deliquescent, get flowing area thereby. The main good point of this kind of method is not to require sophisticated equipment, can the workpiece with polishing complex form, can polishing is very much at the same time workpiece, efficiency is tall. The core problem of chemical polish is polishing fluid make up. The exterior surface roughness that chemical polish gets is general amount to 10 μ M. 1.

3 electroanalysis polishing electroanalysises polishing fundamental and chemical polish are identical, rely on alternative deliquescent material surface namely tiny and bulgy part, make the surface slick. Compare with chemical polish photograph, can remove the effect that cathode reacts, the effect is better. Cent of electrochemistry polish process is two paces: (1) macroscopical full smooth deliquescent production diffuses to the middle of electrolyte, material surface geometry is coarse drop, 1 μ of Ra ＞ M. (2) polarization of positive pole of crepuscular level off, exterior brightness rises, 1 μ of Ra ＜ M. 1.

4 ultrasonic polish puts work into fluid of abrasive in suspension and ultrasonic of a park in field, rely on the oscillation action of ultrasonic, make abrasive is in polish of workpiece surface grinding. Ultrasonic machines macroscopical force small, won't cause workpiece to be out of shape, but it is more difficult to tool is made and be installed. Ultrasonic treatment can be united in wedlock with chemistry or electrochemistry method. Corrode in solution, on electrolytic foundation, bring to bear on again solution of ultrasonic vibration agitate, make deliquescent child breaks away from workpiece surface, near the surface corrode or electrolyte is even; Ultrasonic still can be restrained in the cavitation action in the liquid corrupt a process, benefit is changed at exterior brightness. 1.

The liquid that polish of fluid of 5 fluids polish is flow of support high speed reachs what its carry to grind bead to erode the goal that workpiece surface achieves polishing. Commonly used method has: Motivation of abrasive eject treatment, liquid eject treatment, fluid is abrade wait. Fluid motivation is abrade be by hydraulic pressure drive, make carry the move back and forth of liquid medium high speed that wears bead to had shed workpiece surface. Medium basically uses the special compound with the gender passes good in inferior pressure indelicacy (polymer form substance) and the abrasive on mix into is made, abrasive can use carborundum powder. 1.

6 magnetism are abrade polishing magnetism is abrade polishing is to use magnetic abrasive to form abrasive to brush below magnetic field action, to workpiece grinding treatment. Efficiency of treatment of this kind of method is tall, quality is good, treatment condition is controlled easily, working requirement is good. Use appropriate abrasive, exterior surface roughness can achieve Ra0.

1 μ M. The exterior polish that 2 mechanical polish ask in the polish that basic method provides the place in treatment to say in plastic pattern and other industry has very big different, strictly speaking, the polish of the mould should call lens face treatment. It has very high demand to polishing itself not only and flatness, smooth to the surface degree and geometrical accuracy also has very high level. The surface that exterior polish asks to obtain brightness only commonly can. The standard cent that lens face machines is 4 class: AO=Ra0.

008 μ M, a1=Ra0.

016 μ M, a3=Ra0.

032 μ M, a4=Ra0.

063 μ M, because electroanalysis,the method such as polishing, fluid polish controls the geometrical accuracy of the spare parts accurately very hard, and chemical polish, ultrasonic polish, magnetism is abrade the exterior quality of the method such as polishing short of requirement, so the lens face of exact pattern is machined or give priority to with mechanical polish. 2.

1 mechanical polish is basic the polishing effect that the program wants to acquire high quality, the most important is the oilstone that should have stock high quality, sand paper and diamond abrade cream etc polishing tool and auxiliary article. And the choice of polishing program depends on the exterior state after early days is machined, if machining, electric spark is machined, grind treatment to wait a moment. The common procedure of mechanical polish is as follows: (1) thick cast it is classics mill, electric spark, OK to wear the face after waiting for craft choice rotate speed is in 35000, the whirl of 40000rpm exterior polisher or ultrasonic muller undertake polishing. Commonly used method has the electric spark of wheel purify white that uses diametical Φ 3mm, WA#400 layer. It is manual oilstone next abrade, oil of strip oilstone coal serves as lubricant or refrigerant. Average use order is #180~#240~#320~#400~#600~#800~#1000. A lot of die manufacturer choose for spare time to begin from #400. (2) half essence casts half essence to cast main use sand paper and kerosene. The name number of sand paper is ordinal for: #400~#600~#800~#1000~#1200~#1500. Actually #1500 sand paper is used only comfortable at the mould steel with hard temper by dipping in water (52HRC above) , and do not apply to beforehand hard steel, because may be brought about so beforehand hard steel exterior burn. (3) essence of life casts essence of life to cast main use diamond abrade cream. If with polishing cloth annulus mixes diamond abrade pink or abrade cream have abrade word, criterion normally abrade order is 9 μ M (#1800) ~6 μ M (#3000) ~3 μ M (#8000) . The diamond of 9 μ M is abrade the hair shape that creams with polishing cloth annulus can use purify #1200 and #1500 size sand paper to stay grinds mark. Use then stick felt and diamond abrade cream undertake polishing, it is 1 μ M orderly (#14000) ~1/2 μ M (#60000) ~1/4 μ M (#100000) . Precision asks to be in above of 1 μ M (include 1 μ M) polishing craft is in mould job shops a clean polish is indoor can undertake. If undertake more accurate polish,need an absolutely and clean space. Dirt, aerosol, dander and buccal foam discard as useless likely the face of tall nicety polish that after several hours work, gets. 2.

The issue that the attention wants in 2 mechanical polish should notice the following with sand paper polish: (1) need to use soft wooden club or bamboo stick with sand paper polish. In polishing circle face or spherical when, use cork club but better cooperate round face and spherical radian. And harder batten resembles cherry wood, criterion more the polish that applies to level off surface. The extreme of nap batten makes its can with steel exterior figure maintains be identical, can avoid batten so (or bamboo) acute angle contacts steel the surface and cause deeper nick. (2) when should trading the sand paper that uses different type, polishing direction meet an emergency changes ° of 45 ° ~90, the stripe shadow that leaves after polish of such sand paper of before one kind of model can differentiate come out. Before trading different type sand paper, must touch the clean fluid that takes alcohol and so on to undertake be wipinged carefully to polishing surface with 100 ％ pure cotton, because a very small grit stays in the surface,can destroy accept the whole polish job that go down. Change diamond from sand paper polish abrade cream when polishing, this clean process is likewise important. Before polishing proceed, all grain and kerosene must by complete cleanness clean. (3) to avoid abrade and burn workpiece appearance, when undertaking polishing with #1200 and #1500 sand paper must special caution. Be necessary consequently to load a light load and use law of two paces polish to undertake polishing to the surface. Direction should differ to undertake polishing twice along two when the sand paper that uses model of avery kind of undertakes polishing, turn every time between two direction ° of 45 ° ~90. Abrade polish should notice diamond the following: (1) this kind of polish must undertake below lighter pressure as far as possible especially polishing beforehand hard steel and with fine abrade cream when polishing. Using #8000 abrade cream when polishing, commonly used load is 100~200g/cm2, but the fine that should carry this load is spent definitely accomplish very hard. To accomplish this more easily, one can be done on batten thin and narrow handle, add one sheet copper for instance; Perhaps be in bamboo go up to cut one share and make its more soft. Can help control polish pressure so, in order to ensure mould surface pressure won't be exorbitant. (2) should use diamond when abrade polish, it is working surface not only the requirement is clean, the both hands of worker also must careful cleanness. (3) every time polishing time should not grow too, time is shorter, the effect is better. If polishing process undertakes too longly,will cause " tangerine skin " and " dot corrode " . (4) the polishing effect to acquire high quality, the polishing method that gives out heat easily and tool should avoid. For instance: Rag wheel polish, the quantity of heat that rag wheel produces can be caused very easily " tangerine skin " . (5) when polishing process stops, make sure workpiece surface is clean with careful purify all abrasive are mixed lubricant is very important, should drench in exterior gush subsequently a mould is antirust coating. The element of quality of polish of 3 influences mould still basically relies on to be finished artificially as a result of mechanical polish, so polishing technology still affects the main reason of polishing quality at present. Besides, still wait with craft of the exterior state before mould material, polish, heat treatment about. High grade rolled steel is the premise condition that obtains good polish quality, if hardness of rolled steel surface not all or there is difference on character, often can produce polishing difficulty. All sorts of field trash in rolled steel and stoma go against polishing. 3.

1 different hardness makes to the influence hardness heighten of polishing craft abrade difficulty increases, but the surface roughness after polishing is reduced. As a result of the heighten of hardness, the polishing time that should achieve inferior surface roughness place to need grows accordingly. At the same time hardness heighten, polishing exceeding possibility decreases accordingly. 3.

State of 2 workpiece surface is to the influence rolled steel of polishing craft in the broken process of cutting machining, surface layer can damage because of quantity of heat, internal stress or other factor, undeserved meeting affects cutting parameter polishing effect. The surface after the surface after electric spark is machined compares common machining or heat treatment is more difficult abrade, use energy plan to allow electric spark nap because of before this electric spark machines an end, answering, otherwise the surface can form sclerotic layer. If electric spark essence writes plan accurate option undeserved, the deepness of hot influence layer can be amounted to most 0.

4mm. The hardness of sclerotic layer is taller than matrix hardness, must purify. Because this had better increase a kibble treatment, thoroughly cleared attaint expresses facing, make an average and coarse metal range, for polishing treatment provides a good basis. CNC Milling