The machine tool grinds phenomenon and repair technology research

This thing happens daub in surface of soft metal shallow-layer only, the soft metal layer of injury be grindinged the means with daub, change hard metal face. For example: The cupreous daub of the worm wheel surface after moving is in worm apparently. 2.

Abrade destroys kind is an edge athletic way produces petty nick, happen in surface layer of soft metal surface the following easier part. Sometimes hard metal surface also can have cut, common adjust at equipment period. 3.

Agglutination (rip) should chafe deputy do when sliding relatively. Adhesion dot is cut from base metal come down, make its surface generation rips a gender to destroy, occurrence agglutination sex is injured. The matrix of two parts that produce in mutual attrition more relatively in. If machine tool slideway and slide are in,lack lube and bring about belong to this kind to grind more at attrition. 4.

Bite instantaneous of relatively slip spare parts surface dead to show the temperature of hair quite tall, adhesion area big, bit more adhesion intensity is very high also, adhesion cannot cut from matrix come down, create the appearance that stops relative to motion. This is our research in grinding a most serious kind, common saying also says for " hold an axis in the arms " . (3) adhesive wear grind a lot of elements affect influencing factor to grind phenomenal happening, we can have through studying these factors really right of the gender take step, precaution grinds phenomenal happening and development. 1.

Lubricant condition is opposite the element of lube adhesive wear grind the impact is very big, whether the lubricating film that maintains attrition surface to retain enough strength from beginning to end, avoid attrition appearance between be contacted directly and form 1000 attrition of metallic surface or do attrition partly, it is to prevent to produce the adhesive wear hinge that grinds. Ensure of attrition surface good and lubricant it is very important. 2.

Pressure element usually, as the accretion of pressure, adhesive wear grind to also can accentuate. When the hardness that exceeds attrition deputy material when pressure load, film of oxidation of attrition deputy surface is pressed to;burst;ulcerate;fester, the bulgy dot of new student face is mutual and built-in between two surfaces, and mutual shift makes this kind grinds to accentuate, serious when bring about agglutination of attrition deputy surface, bite dead even. Heavy-duty machine tool belongs to this kind to grind more. 3.

Temperature element crosses the quantity of heat that Cheng produces in attrition, it is certain to make attrition surface temperature lifts when degree, light person destroy lubricating film, contact directly and form dry attrition what make belong to the surface or do attrition partly: Serious when can make material is in do temper state and reduce material hardness; More serious phenomenon is local high temperature makes the kind stuff of attrition surface is in dissolve condition. Accordingly, temperature is right generation adhesive wear grind the impact is very big. 4.

When the element pressure of sliding velocity is constant, sliding velocity is small, the action that forms lubricating film is reduced, at this moment the crossing of oily film is lesser, oily film often moves because of cannot bearing pressure and the part is destroyed, cause two metals to see so that contact directly, bring about easily grind. But when sliding velocity reachs certain level. Cause clash easily also deputy temperature is elevatory, easy destroy lube film, bring about then grind. 5.

The element of exterior surface roughness the more slick surface, fight the adhesive wear ability that grinds bigger. It is OK to reduce exterior surface roughness to be worth appropriately precaution grinds this kind. Accordingly, maintaining when the machine tool, often blow in surface of machine tool slideway grind decorative pattern, the purpose is to facilitate an oil storage, precaution grinds. 6.

The element brittleness material of material compares plasticity data fight adhesive wear ability strong: The attrition that the stuff place with great sex of each other dissolve comprises the attrition that the stuff place with little sex of the deputy dissolve that compare each other comprises deputy, easier generation adhesive wear grind. The inclination that metal and the attrition deputy generation that metalloid place comprises grind this kind is little. 　 of 　 of Nextpage 　 2, grind bead to wear away model grind 　 　 pollution enters the grain between two attrition surface, the remarkable cutting effect that produces when the surface moves, cause attrition surface to produce nick and groove to grind type. (One) grind bead to wear away model the mechanism hard grain that grinds to arise enters two attrition surface between hind get the action of two force, one is perpendicular the force at the surface, another is parallel the force at the surface. Hard grain leaves penetrate into outside in former action, and the generation below the action in latter is tangential motion, its bring about the surface to leave nick or groove as a result. (2) grind bead to wear away model the classification that grinds we get on the machine tool to grind bead commonly to wear away model grind to divide roughly it is 3 kinds: 1.

Knock against causes in process of our production treatment, the slideway hard to avoid of the machine tool can get the knock against of the tall stress article such as workpiece or tool, the surface that is slideway accordingly appears indentation, and can appear at the same time all round its raised or burr. Be like not seasonable rehabilitate, be in when slide on slideway when Hua Dong, certainly will grinds slide. 2.

Hard bead takes the external world that causes between 8 attrition face cut what bits and molding sand enter a machine tool to arrive return with slide between, grind those who form a type bead to wear away model grind: Cut bits or molding sand to be below perpendicular pressure, pressure break through slideway or slide surface, when slide is mobile, make slideway and slide grind. 3.

The bilge that contamination enters attrition face to cause enters attrition area through lube between, although won't be pressed,break through attrition surface, but the osculatory position that can change attrition face, as a result of the bearing of bilge, with bilge osculatory position susceptive presses stress to increase, after moving for long, also will produce abrade or tiny nick. No matter we take what kind of step, the problem that the machine tool grinds also avoids hard. Accordingly, we study the purpose of the mechanism that grinds to arise and type, want to find out the method that repair grinds namely. Once the machine tool happened to grind, must stop to move instantly, find out a reason, suit the remedy to the case, seasonable rehabilitate. Will tell commonly, to daub a kind slight grind, need not make repair, but must strengthen lubricant, prevent to grind to expand. pair of agglutination, bite dead etc grind, must have repair. Grind deputily with respect to a few kinds of common attrition now repair undertakes discussing: (3) the repair 　 of sliding bearing and axis 1.

After sliding bearing surface is ground, the method of first selection is to blow grind law. Sliding bearing has the surplus that can make repair for tone commonly, one of completely OK and contented machine tool repairs cycle. If grind very serious, when repair surplus cannot be satisfied, be about to change in time bearing. 2.

Have when journal when grinding, can use grind young journal, change the method of sliding bearing. But journal is repaired grind a quantity to should not be too big, for instance machine tool main shaft, long grind a quantity to cannot exceed bearing surface to quench, the cementite, oxidation, nitrogen that reach carbon in all the ply of ooze, repair hardness of surface of the journal after grinding not the floor level under original design hardness: To transmission shaft, journal should not be less than the dimension that directional front journal or protruding stage are assembling when assembling. Also can use of course solder the method that repair comes repair journal, but the influence of the geometrical precision that process countershaft heats when wanting to consider solder to fill, mechanical intensity and exterior hardness. Still a bit need to notice, after journal rehabilitate, need to deserve to do sliding bearing or bearing to cover afresh by journal commonly. (4) worm deputy repair worm pair when produce felt or grinding, the tooth flank of worm all is mixed by sclerosis abrade, worm surface hardness can drop, cementite worm tooth flank can produce chap phenomenon sometimes. In repair worm deputy when, it is repair worm wheel discards as useless worm, still be repair worm discards as useless worm wheel, or repair, besides the damage level according to them, return the configuration of deputy drive of worm of Lv of take an examination. The worm that spurs drive to secure a center when transmission deputy, general can repair, change, be repaired transverse tooth thickness reduces small amount You Zenghou is new compensation of transverse tooth thickness, lest tine of clench the teeth is unoccupied place,increase. Set out from the point of view that considers tine strength, unfavorable reduce transverse tooth thickness of thin worm wheel, and should preferential the method that chooses repair worm. If worm is cementite to quench, criterion tooth flank is repaired grind a quantity to should not be too big. If the value of consideration worm wheel is more expensive, also can choose repair worm wheel, change the method of worm. (5) the rehabilitate of machine tool slideway to machine tool slideway slight grind injury and abrade, want to use drawknife or holystone rehabilitate only, can continue to move. And grind to agglutination sex, need to use solder to repair or fill up stick fill the method comes repair. To machine tool slideway solder repair with stick fill, opposite for technology is relatively sophisticated, especially the rehabilitate of large area, should consider more before repair comprehensive: The first, the repair technology that should consider to use is right the precision of slideway, mechanical function has deny an influence. If suffer the effect of temperature, whether can cause amount to slideway to be out of shape, the mechanical intensity that whether can change slideway breathes out exterior hardness to wait. The 2nd, the repair technology that should consider to use is right the adaptability of slideway material, if the slideway of cast-iron material does not use cast-iron v commonly, because cast-iron solderability is poor, the blemish such as easy generation crackle, stoma, unfavorable also treatment. The 3rd, the mechanical strength that should consider to repair an itself and slideway work actually environment. Norms different, performance is different, economic the machine tool with different environment, should choose when repair applicable solder fills and stick filling material and advanced repair method and new technology. CNC Milling CNC Machining