Mould design affects aluminous Die Casting quality

Influence Die Casting the element of quality affects Die Casting the element of quality is very much, if type of Die Casting aircraft reachs quality, Die Casting the structure of geometrical structure and the rationality that the technology asks, mould and the technical level that operate personnel. 1.

Die Casting the use requirement that designs an architect to should understand an user adequately above all and working requirement, die Casting circumstance getting power, choose proper material to pledge according to using requirement and working environment next, understand function of its material qualitative Die Casting to wait. When the design, want special attention to be below the premise of contented use requirement, make as far as possible Die Casting the structure is simple. The wall is large proper and even, and leave necessary rake giving a model, can bring about Die Casting otherwise on occurrence indentation, stomatic, shrink loose, owe casting, drawing stamp, crackle, be out of shape wait for blemish. Die Casting the requirement of dimension precision should reasonable, can be opposite otherwise of condition of treatment of mould design, mould, craft make and management causes needless trouble, can create many rejected product again. 2.

The choice Die Casting of precision of mould structure, treatment and Ink> mould material be by mould Die Casting, the choice of material of the design of undoubted mould, treatment, mould have affinity with product quality. Mould structure is unreasonable, why to no matter be adopted from craft,plant measure, make a product very hard eligible. In addition, the surface roughness of the treatment precision of mould material, mould, surface, little gap that machines trace, heat treatment, nitrogen changes a ply and mould to assemble undeserved etc, can affect the quality of the product and mould life. 3.

The shrinkage of the shrinkage cast material of cast material, general with average percentage or when giving out in order to have the percentage form of certain span, choose the average shrinkage of material normally. The Die Casting to high accuracy, when designing a pattern, choose material shrinkage to answer special attention, when necessary, can make experiment pattern first, after the data that obtains need on experiment mould, begin to design and be made again use at mass-produced mould. 4.

Make and carry out what make and implement Die Casting technology of Die Casting craft, the quality with equipment of mould, Die Casting, technology level that operates personnel is concerned. In home condition of equipment of existing Die Casting falls, to Die Casting craft parameter still is hard to realize stable, reliable, accurate control. Implementing technology of main control Die Casting is the process that combine the element such as material of Die Casting equipment, Die Casting and mould and tries to apply. Lax to craft and main parameter carry out, can make Die Casting happen shrink loose, be out of shape, owe casting, dimension unqualified etc. 2.

Die Casting the relation mould of quality and mould is Die Casting main tool, accordingly, when designing a pattern, should notice to make a pattern overall as far as possible structure and construction of mould spare parts are reasonable, facilitate make, facilitate use, on the safe side. Want to make the mould is not out of shape in Die Casting, metallic fluid is stabilized in the flow inside the model, can even ground makes cast cooling, can full automatic Die Casting and without reason barrier. In addition, want to wait to choose appropriate mould data reasonably according to simple case of production lot, lumber. 1.

The structure of mould and mould spare parts wants reasonable in light of the viewpoint from intensity, what design mould part into whole is good, hard usage, in use damages not easily, be out of shape not easily. But, if Die Casting form is complex, mould part is complex also, can make the mould machines difficulty, the precision of treatment is not tall. Be like a combined-type of make it of mould spare parts, machine simplify greatly, easy obtain tall treatment precision, the Die Casting that can acquire high quality then. 2.

Model number of the decision decision that antrum counts antrum, what should consider equipment ability, mould to machine is difficult the precision of size of easy, production lot, cast asks to wait. Especially much model antrum mould, because mould treatment difficulty is great, dimension precision error is big, flow path configuration is obtained not easily balanced, each model antrum cast function is abhorrent. Die Casting claimed accuracy when form of tall, geometry is complex, best one model one antrum. Small-sized cast is decided according to the circumstance. 3.

The design gating system of gating system is liquid metal fills up not only Die Casting passageway, of the rate of going from place to place that returns pair of fuse-element and pressure deliver and exhaust condition, Die Casting heat is smooth wait for an element to have adjust action, so, sort of requirement of the structural characteristic that designs gating system to must analyse cast, technology, alloy and its character, the type that considers Die Casting machine even and characteristic, such ability design sound gating system. 4.

Mould of exhaust system design should set the excessive launder of enough overflow limits and exhaust channel, this pair makes sure product quality is very important. People often ignores overflow passageway to block dead phenomenon up prematurely by the metallic fluid that come in. Want to use reasonable structure, make metallic fluid first the darker place of inpour overflow chamfer, make sure steam vent is in the longest inside connect all the time. In addition, overflow chamfer should set a makings staff, in order to eliminate the metal in overflow chamfer. 5.

The temperature of model of mould temperature Die Casting is a when affect cast quality main factor. The model is lukewarm undeserved, not only influence Die Casting quality of inside and outside (if cast produces stomatic, shrinkage cavity, loose, mucous membrane, grain bulky wait for blemish) , still affect cast dimension precision, even cast is out of shape, make Die Casting model appears chap, make cast surface forms the meshy burr that keeps clear of hard, influence Die Casting exterior quality. It is with aluminium alloy exemple, alloy temperature irrigates casting mould in 670-710 ℃ . In producing practice for a long time, summary reachs optimal temperature should control the mould 40% what irrigating casting mould temperature. Temperature of model of aluminium alloy Die Casting is 230-280 ℃ , mould temperature is helpful for winning cast of high grade high yield inside this one limits. The pattern is general need not gas or report heat, and use warm-up refrigeration device, these device are make medium with oil according to the requirement, undertake warm-up and refrigeration to the mould. 6.

Shape when the dimension of spare parts of decision computation Die Casting of spare parts dimension, the shrinkage that chooses Die Casting material should be accorded with actual, the product that can cause production otherwise is unqualified. When necessary, after passing experiment mould actual measurement, calculate again Die Casting dimension. To the product of high accuracy, the heat that wants a material of spare parts of mould Die Casting even expands and save after product Die Casting, use environment considers the influence of product measure precision inside. 7.

The decides cent face position of cent side position, can affect drawing of patterns of mould treatment, exhaust, product to wait. Normally, cent cover can leave one striation trace on the product, affect the exterior quality of the product and dimension precision. Accordingly, when designing cent face place, divide outside waiting for a problem considering treatment of product drawing of patterns, mould, exhaust, can put cent side position in product surface quality the demand is not high, or the place with dimension not tall precision. 8.

The mould cannot be out of shape often have a structure as a result of the model unreasonable or mould material is chosen undeserved, create rift of mould in use, be out of shape, bring about a product then unqualified, for this, when designing a pattern, must adopt proper measure to assure the quality of the product. Normally, when Die Casting, force of mould internal pressure is 70-100MPa, to make the mould is not out of shape amlposition, model antrum wants sufficient thick, of installation core board reach bolster plate to want sufficient thick, a pad can add below bolster plate when necessary. Model core and model antrum should be installed reliable, model core and surface roughness of installing hole flank want appropriate, surface roughness cannot too low, wear via core to answer both sides is fixed, in order to prevent a product at the same time the wall is large, at the same time the wall is thin. To aperture of the blind on the product model core, also answer from reach into makings opening position, amount model way thinks on core consolidate, make model core gets power balanced. Can be opposite to Die Casting model model antrum, bolster plate undertakes intensity school nucleus. Right model antrum wall is large undertake nucleus of school of intensity, stiffness, undertake stiffness school nucleus to bolster plate. Except adopt on mould structure certain assure measure besides, still must choose be out of shape the mould stuff with small, good strength. Additional, clearance exists between mould guide pillar and guide-post bushing, or the quality that guide pillar, guide-post bushing wears away mediumly to be able to affect a product in use process. Especially the product with dimension expensive precision, to assure product precision, can move in the setting on cent face, fixed die cone cooperates a part, perhaps be in model proper place installs 2-4 all round antrum fixed position lever, fixed position is reached since enhance action, move in order to prevent, fixed die amlposition, it is more important that this uses a model to production of large, big batch. Roll out a system to should install guide pillar, in order to prevent the job such as push rod not smooth, side sufferring sheet wears away, make sure the product gets power even, when the top goes out, do not make the product is out of shape. </DIV> CNC Milling CNC Machining