Cast steel fill shrink the application of rising head material

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  • source:TRIANA CNC Machining
Casting a process is a complex systematic project, the influencing factor that involves is very much, the essence of mold design is the requirement according to cast quality, analyse main influencing factor, seek control way, establish the procedure of technology measure. The computer assists the development of mold design and application, become mold design to optimize form process quality pilot with cast a kind of significant step. The research organization that coins an industry domestic and internationally at present and manufacturer home are developed eagerly and roll out all sorts of cast caky simulation software, curdle technology ration is changed, intelligence is changed, the program is changed. Content includes technology program option, gating system dimension is calculated, rising head type, the position and dimension are decided really, make blemish is forecasted optimize with craft provide scientific sex, rationality more. (1) common rising head is used as a result of common rising head and casting mould same kind of modelling material, after metallic fluid fills rising head, its quantity of heat sends out through flank and end face, rising head is begun to the center by surface layer caky. The metallic fluid in rising head is divided use at filling to shrink outside rising head oneself, occupy 6% ～ only the metallic fluid of 10% is used at filling to shrink cast. To make rising head is in whole and caky during the system that enough metallic fluid compensates cast is contractive, win compact cast, rising head needs a design to get bigger, taller. Although rising head is OK melt down, but still expend much labor power, material resources and the sources of energy, make cast cost rises. (2) heat preservation rising head covers heat preservation rising head comprise by heat insulating materials, fireproof aggregate and binder, have thread commonly usedly compound model, flue is grey (float bead) pearlite is compound model, ceramists is compound model etc. The rising head that becomes with these material covers weight light, fireproof degree tall, hot loss is small, heat preservation performance is good, technology makes rate can raise 10% ～ 20% , have better technical effect and economic benefits. Fiber is compound model heat preservation rising head is covered is to use organic fiber, inorganic fiber, fireproof aggregate to make raw material, it is binder with colophony, use special vacuum figuration technology to be made, rising head forms the network structure of poriferous shape, pile up equably with layer shape. Caused many dispersion sex stoma in insulation material interior so, additional, the action burn carbonization that rising head covers the organic fiber in material to pass fluid of high temperature metal, increased the small hole amount in internal composition further, apparent pore rate is as high as 65% ～ 70% , the heat that prevented high temperature condition to fall is conducted and heat radiation, accordingly, it has good heat preservation performance, more be helpful for cast fill shrink. Flue is grey (float bead) compound model heat preservation rising head is covered float mediumly bead it is a kind of hollow globose fine grained, the function of heat preservation of rising head heat insulation that controls with it more excel fiber compound model heat preservation rising head is covered. (3) rising head of calorific heat preservation is covered give out heat a rising head and a general designation of exothermic mixture rising head are calorific rising head. Make with calorific material rising head is covered, pouring when the metallic fluid in rising head and chemistry of heat build-up of calorific material hair react, the quantity of heat that emit and persistent time, in cast the metallic fluid in rising head can be being kept in caky process is liquid state for long. Exothermic mixture rising head is the rising head that drops exothermic mixture in the end face of common rising head, it rises to heat likewise the action of metallic fluid. Calorific rising head fills shrink efficiency fills than common rising head shrink efficiency is a lot of taller, design of rising head dimension also can compare common rising head small, the technology of cast makes rate is higher. Rising head of calorific heat preservation is covered is the rising head that makes with heat insulating materials, calorific material is covered, it assembled the advantage of heat preservation rising head and calorific rising head, fill shrink 3 times efficiency is common rising head, it is to cast one of engineering technology with the most advanced industry at present. Additional, bright rising head adds coverture to be able to produce optimal result. The sort of coverture basically has: Broken bits of ash of pink of rice husk of plant ash, carbonization, coke, flue, thermit, black lead and compound model coverture of calorific heat preservation. A large number of experiments and manufacturing practice make clear, bright rising head does not add coverture, fill shrink efficiency is very poor, although used heat preservation rising head or rising head of calorific heat preservation, also cannot achieve expectant result. In postponing the process with caky rising head, the action of coverture occupies 30% ～ 50% , the action that heat preservation covers occupies 50% ～ 70% . Coverture and heat preservation rising head or combination of rising head of calorific heat preservation are used, can show result of its heat preservation more, make caky time twice raises rising head. The action of coverture aggrandizement rising head is not wrong at itself of heat preservation rising head, must cause enough attention. Coverture sort is different, action and effect are distinct also, the enterprise needs to reach technical craft to ask character according to cast material logical choice. CNC Milling