Workmanship of mould of brief analyse glass reinforced plastics

3mm (100mm less than) , statified ply is 0.

2mm, generated archetypal the largest measure can achieve 500mm of × of 350mm × 350mm. In the archetypal process that make, want to ask according to products plan above all, through the software of three-dimensional CAD modelling such as Pro/E, UG, CATIA the design gives the three-dimensional model of the product, so that have view model, revise. Pass STL document next changeover, statified the operation such as the processing, design that prop up, use RP technology finally to be able to design a three-dimensional and hypostatic prototype. After prototype has been made, need undertakes cleaning, purify is propped up, hind the processing such as solidify. The paste of FRP mould hand that is based on RP prototype shapes the choice matrix colophony of 1 material uses technology the WSP6101 that Inc. of new material of blue star chemical industry produces without stannic colophony factory epoxy resin, shrinkage of solidify of this epoxy resin is low, dielectric protecties is wonderful, very stable to all sorts of soda acid and organic dissolvent, tensile strength can amount to 450 ～ 700kg/cm2, fight flexural strength to be able to amount to 900 ～ 1200kg/cm2. The agent of solidify of E-999 of epoxy resin normal temperature that solidify agent uses Shenyang city to revitalize practical technology institute to produce. Thinner uses acetone (or aether of butyl of annulus oxygen propane) . Mould gel coat uses high temperature resistant, hardness the mould with tall, good tenacity is special gel coat. The fiber of mould of the FRP that make enhances material to use 300g/m2 to not have alkaline short cut felt and 0.

Cloth of pane of 2mm fibre glass. 2 procedure use RP prototype to shape for paste of master mold hand the technological process of mould of glass reinforced plastics. This kind of method is the epoxy resin with liquid state and organic or inorganic material mix to be base material, the method of a kind of patternmaking that pursues a burnt patternmaking to provide for fiducial handiwork with prototype. Hand paste shapes the specific process of mould of glass reinforced plastics is as follows: (1) the prototype that the solidify of finishing ultraviolet light of RP prototype designs folds a direction to go up in its, because every section is sectional,have certain ply, step phenomenon can produce in the hypostatic surface after shaping, this will affect the hypostatic on size error after shaping and exterior surface roughness directly. Accordingly, must undertake the processing such as burnish, polish to archetypal surface, in order to raise the smooth rate of archetypal surface, make archetypal surface enough and slick only, what just can assure pattern of assuring glass reinforced plastics antrum is bright and clean degree. (2) design of cent of choice and perfect cent face face is reasonable, the paste that operates difficult easy degree, mould to craft is made and make a quality have very big effect. Usually, according to feature of archetypal substance body, in ensure archetypal can successful drawing of patterns reachs a mould to go up, below the premise of precision of installation of below two parts, the position of cent face reachs appearance to answer as far as possible simple. Accordingly, want the correct and reasonable seat that selects cent face and runner, forbidden appear to unplug modular rake, lest appear cannot drawing of patterns. Secure prototype along aquaplane of cent face consumed, so that undertake the apart paste of fluctuation model,make. When the besmear on prototype and cent face brushs agent of drawing of patterns, must Tu Junyun, considerate, besmear repeatedly brush 2 ～ 3 times, after the agent of drawing of patterns that before waiting for one besmear brushs is dry, fangke undertakes below one times besmearing brushing. Nextpage (3) besmear brushs gel coat layer to wait for drawing of patterns after the agent is completely dry, the mould special gel coat brushs minute of second besmear with wool, besmear is brushed should even, need ground floor after coagulating first, besmear again brush the 2nd. Gel coat color is black, total ply of gel coat layer should be controlled in 0.

6mm left and right sides. Should notice gel coat cannot besmear here too thick, with preventing to produce the appearance crackle is mixed corrugate. (4) because viscosity of normal temperature colophony is very big,colophony glue fluid is made up, can heat epoxy resin in box of 60 ℃ constant temperature first 30min, in order to reduce its viscosity, mix with 100 WSP6101 epoxy resin next 8 ～ 10 (weight is compared) acetone (or aether of butyl of annulus oxygen propane) mix in clean container, with report after beater or manual mix are even, rejoin 20 ～ 25 solidify agent (the affiliation of solidify agent is measured should according to temperature of the air temperature at that time, spot proper increase and decrease) , rapid agitate, undertake vacuum deaeration 1 ～ 3 minutes, with the bleb in fluid of eliminate colophony glue, can use. (5) fibre glass chases a paste to make wait for gel coat coagulate first, feel is soft and when be not being stuck, on the mould gel coat that brushs the besmear of fluid of epoxy resin glue that has allocated classics gel, immediately spreads one layer weak point to cut felt, squeezing ramming, eduction bleb. Fibre glass with GC, M, M, R, M, R, M... (GC shows gel coat, m states 300g/m2 is not had alkaline short cut felt, r expresses 0.

Cloth of pane of 2mm fibre glass) accumulate a method to undertake paste is made chasing a layer, need ply till place. The process is controlled in paste in, want to control the dosage of fluid of every colophony glue strictly, want fiber of can sufficient soak already, cannot pass again much. The volume that contain gum is high, bleb eliminates not easily, and cause solidify exothermic is big, shrinkage is big. Whole paste makes a process be executed for many times shape, paper every time make 2 ～ 3 layer hind, after wanting to waited for solidify exothermic height to pass (namely when colophony glue fluid is ropier, in 20 ℃ general 60min is controlled) , fang Kejin issues paste to make all right. Cloth of the fibre glass when paste is made must spread Fu level, the juncture between vitreous cloth should stagger each other, do not build in place of edges and corners as far as possible receive. Should notice to be brushed with wool tighten cloth lamination, make the amount that contain gum even, evict bleb, below some circumstances, need uses pointed shape thing, carry bleb. After solidify of the first mould, excise redundant flash, clear mould and prototype of other in part are apparently sundry, can play agent of drawing of patterns, layer of the gel coat that make, place inject aperture and steam vent, undertake the paste of the 2nd mould is made. After waiting for solidify of the 2nd mould, excise redundant flash. Have enough strength to assure a standard, avoid a mould to be out of shape. But a few brace, fastener, fixed position sells proper felt wait to have a structure in order to perfect a model. (6) nap of drawing of patterns is in normal temperature (20 ℃ are controlled) the pattern that next paste had made, general 48 hours of basic solidify finalize the design, namely can drawing of patterns. Use as far as possible when drawing of patterns compress air intermittent blow air, in order to make mould and master mold depart gradually. The use of mould of backsight of drawing of patterns asks, the machining such as some of bore can be done on the mould, shed full blind angle point not easily in a few colophony especially, below the circumstance that does not have obligate stoma, must drill some of air hole. Undertake mould aftertreatment next, use waterproof abrasive paper of 400# ～ 1000# commonly surface of ordinal burnish mould, use polisher undertakes exterior polish to the mould. After all working procedure are finished mould can consign is used. Hand paste shapes the common flaw in craft analyses bleb: When burnt patternmaking is provided, often pass as a result of colophony dosage much, content of the bleb in glue fluid is much, viscosity of colophony glue fluid is too big, enhance material the choice is undeserved, cloth lay up did not press spun glass to wait for a reason to cause a mould to reach cheek by jowl model antrum surface has a large number of bleb to arise, this affected the quality of the mould and exterior surface roughness badly. Often use control to contain glue amount at present, deaeration of vacuum of colophony glue fluid, add right amount thinner (like acetone) , choose soak resinous spun glass easily the generation that the measure such as cloth reduces bleb. Shed glue: When manual burnt patternmaking is provided, often appear the phenomenon that glue current drips. Cause the cause that sorts glue to basically behave for: ① colophony viscosity is too low; ② burden is inhomogenous; Dosage of ③ solidify agent is less. Often use join filler to raise resinous viscosity (like 2 oxidation silicon) , adjust the measure such as the dosage of solidify agent appropriately, shed the occurrence of glue phenomenon in order to avoid. Statified: As a result of colophony dosage inadequacy and lay up of spun glass cloth were not pressed close together, heat prematurely or heat temperature is too advanced, can cause a mould statified. Accordingly, when paste is made, want to control enough glue fluid, make lay lamination fact as far as possible. Colophony does not heat as far as possible before gel, proper control heats temperature. Crackle: When make and using a pattern, we often can see in the mould the surface has crackle phenomenon to appear, because gel coat layer is too thick,the main reason that causes this one appearance is and the effect that suffers force of inhomogenous drawing of patterns. Accordingly, the ply of mould gel coat should be controlled strictly. When drawing of patterns, forbidden beat a mould with good thing, had better use compress air drawing of patterns. The last word can see from inside the treatise above, the paste of hand of mould of glass reinforced plastics that is based on fast prototype shapes the technology has forthright of fast sex, high accuracy, craft, operation handy wait for an advantage, can transform design thought quickly inside very short time for real product, shortened greatly the development cycle of new product, reduced manufacturing cost already, realized the big batch of the product to produce again, satisfied an enterprise to respond the development tendency of market demand quickly. But its also are put in the limitation with particular move, if the size range of pipe bent of fast prototype is finite, this greatly demarcate the application that fast and archetypal technology makes a field in mould of glass reinforced plastics. Accordingly, current and fast archetypal technology is confined to certain measure, precision the pattern of glass reinforced plastics with taller, mixedder appearance is made. Bigger to those dimension, precision the mould of glass reinforced plastics with inferior, simpler appearance, can use the material such as cement, gesso, lumber to design master mold, can reduce cost effectively so, shorten time limit for a project. Accordingly, in shape when mould of glass reinforced plastics, we should ask according to particular product and produce a condition, use specific technology, explore new technology, new material ceaselessly, ability achieves more good practice and manufacturing result. CNC Milling CNC Machining