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One, bakelite brief introduction
Bakelite, common weighs bakelite, model of formal name phenolic aldehyde is plastic, it is hot solid model a plastic kind, also be the earliest devoted industry those who produce is plastic. The bakelite powder that bakelite pours model to be used is by phenolic aldehyde colophony, curium wooden pink, and stiffening agent, solidify agent, plasticizer, colorant, lubricant, the additive such as solidify intensifier forms. Can undertake the modified of all sorts of need to bakelite pink more, there are the 40% additives that order about in bakelite pink. Phenolic aldehyde colophony is the condensation polymerization content of phenol and formaldehyde, have mechanical strength tall, the function is smooth and steady, acid-proof alkaline, high temperature resistant microtherm, caustic of hardness tall wear-resisting, do not kiss water, electric equipment insulating properties is good the insulation heat-insulating material that is a kind of aspiration. The model of bakelite pink changes temperature to be in 90 ℃ of 70 ～ , optimal solidify temperature orders about in 160 ℃ , bakelite arrives at the Russia when 160 ℃ in temperature like that solidify, the nicety with lukewarm to the model reason is held charge pair of model entity very crucial point. The good of bakelite: Electric equipment switch, knob, handle of kitchen utensils and appliances, electric equipment crust, come in electric equipment fittings this year, car a replacement, the technology is tasted in get more and more extensive apply.

2, bakelite notes model technology
1, bakelite notes model technology key to summarize. Pink of A, bakelite is planted in the makings canister after warm-up the frit makings state that is viscosity lowestB, because the filling of 40% is contained in bakelite pink, the resistance that note model is very great, reason should bring to bear on the greater pressure that note modelC, beforehand before model need not and cannot undertake stoving to bakelite pink
The as a result of bakelite solidify process in the D, process that note model is accompanying the happening of lunt and chemical gas, the mould should open air discharge duct, and even should add modular exhaust working procedure. E, model changes a condition: Back pressure, screw rotate speed, makings is lukewarm

1, back pressure is great, can make frit expects abundant model is changed, model is changed even, but make because temperature passes,frit expects easily tall and fluidity of lose of in advance solidify, cannot note model; Back pressure is little, frit makings model is changed not abundant, frit expects fluidity is poor, cannot fill model. Should carry out state and screw makings canister according to material wear away state, tone sets appropriate back pressure.

2, screw rotate speed is bigger, model spends hour shorter, frit expects cannot abundant model is changed; Screw rotate speed is less, the conflict when model is changed is feraller, make frit expects temperature is exorbitant and in advance solidify, produce gas, the influence is filled model still can expect to screw the canister is formed corrode, wear away aggravating.

3, makings is lukewarm exorbitant, frit makings is in of screw cut next nimble solidify, make screw expects the canister wears away aggravating, cannot inject more, jam shoot chew; Makings is lukewarm too low, frit makings model is changed not abundant, inject is slow, cannot circumfuse antrum, frit lapping defect is apparent. General, expect Wen Yingcao accuses to be in 70 ～ between 90 ℃ , if material PF-161J makings is lukewarm,should be in 78 ℃ of 72 ～ are advisable.

Fill modular requirement: Shoot glue speed, shoot glue pressure, protect press hour
1, rate ejaculation glue is too rapid, the conflict heat that frit makings and mould produce is bigger, make frit expects local and premature solidify, and even scorch, gentle style cannot discharge the lunt of a solidify happening clean, produce acne shape stoma probably light blanks; Speed ejaculation glue is too busy, produce flow mark and frit lapping defect simply.

2, pressure ejaculation glue is too great, make frit glue model crackajack, mechanical function is crackajack, but added model internal stress, make wool edge thickening greatens (Mao Bian with can be being penetrated by sunlight advisable) ; Pressure ejaculation glue is too little, finished product is simple light blanks, frequently light blanks causes a mould simply to stick makings is nigrescent, make burnish of commodity appearance lose hoar.

3, protect press hour to grow more, model weight is greater, model more close-grained, but protect press hour too long meeting forms hardship of drawing of patterns, protect after pressing hour to surmount 25 seconds, model heft will be added no longer; Protect pressure hour is shorter, shorten rate add, protect pressure when hour is too short, produce cycle shortens, premature drawing of patterns will be formed sticking to mould and be out of shape.

Solidify shapes condition: Mould temperature, cooling hour
1, mould temperature is higher, the mould shapes cycle is shorter, rose to produce power, but the model is lukewarm exorbitant when, bakelite pink scorchs simply, present pinhole, still make the frit stuff that charges rapid solidify and the gas that has not enough time to will happen is complete eduction and form tired gas, burn yellow mould, produce sticking to mould, hoar wait for blemish; The model is lukewarm too low, fluidity of frit glue forward becomes poor, cannot circumfuse core, more make connection of frit makings solidify not close, mechanical intensity is poor, glossiness is poor. If cooling hour is changeless, simple sticking to mould or hair are angry when drawing of patterns bubble.

2, cooling hour, mould temperature is high, cooling hour can be in ensure model measure is appropriate below the condition inside tolerancepublic errand limits decrease; Model the wall is large bigger, cooling hour is about corresponding accretion.




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