Mould control realizes nicety to note model

Nicety notes model to be able to get the influence of a lot of relevant elements and ambient conditions, and the basiccest is the plastic material, Injection Mold Tooling, craft that note model is mixed the equipment that note model these 4 main factors. Designing the early days of plastic products, the project that should use environmental choosing to decide corresponding function to need according to its above all is plastic. Next, the precision of dimension of the plastic material that should choose according to place, finished product, mould structure that makes requirement of a weight, quality and forecast will choose the proper engine that note model. Among the relevant factor that notes model in influence nicety, the mould is the key that obtains the accurate and plastic products that accords with quality requirement. The design mould of the mould designs whether reasonable meeting to affect the quality of plastic products directly. Because mould antrum dimension is the shrinkage that adds place to use data by measure of plastic products requirement,must come, and shrinkage often the numerical value inside a range that by plastic production manufacturer or project plastic manual recommends, it not only position of the runner form with the mould, runner and distributing about, and as plastic as the project crystallization orientaton sex (anisotropy) , the appearance of plastic products, dimension is concerned to the distance of runner and position. The main factor that affects plastic shrinkage includes to heat up contractive, photograph to change systole, orientaton systole, compress systole and stretch reply to wait, and these influencing factor and nicety fix model product shape condition or operation condition are concerned. Accordingly, the architect of the mould must have rich design and Injection Molding experience, must consider these influencing factor and the relation of the condition that note model and its apparent factor, if note structure of temperature of fuse-element of model pressure and modular antrum pressure and filling velocity, inject and mould temperature, mould,reach runner form and distributing, and the crystallization of the content that wall of runner cut area, goods enhances filling in thick, plastic material, plastic material spends the influence that waits for an element with orientaton sex. The influence of afore-mentioned elements also because of plastic material different, or other shapes the condition if temperature, humidity, continue to crystallize change, of the internal stress after shaping, machine that note model change and differ. Because note model procedure,be plastic from solid state (pink expects or bead expects) to liquid state (fuse-element) to solid state (goods) the process of change. From bead expect fuse-element, arrive by fuse-element again goods, the temperature field, stress field, effect that spreads field and density field to wait should be passed among. Below the joint action of these field, those who differ is plastic (hot solid sex or sex of crystallization of thermoplastic, crystallization sex or blame, increase model or blame increase model etc) have different polymer structural configuration and shed denaturation can. Always affect afore-mentioned " " the physics that the element is sure to be able to affect plastic products is mechanical function, dimension, appearance, precision and exterior quality. Such, the immanent connection between configuration of the function of craft element and polymer, structure and plastic products can pass plastic products expression to come out. The analysis is clear about these immanent connection, right reasonably protocol notes model to machine craft, be designed reasonably and create a pattern by blueprint, and even logical choice notes model to machine equipment to have important sense. Nicety is noted model and common note model to there also is distinction on the pressure that note model and inject rate, nicety notes model to often use high pressure or extrahigh voltage inject, high speed inject to shape lesserly in order to obtain shrinkage. Integrated afore-mentioned all sorts of reasons, outside element is being designed except what consider general pattern when designing accurate Injection Mold Tooling, still must consider the following ﹕ 1 use proper mould dimension common difference; 2 prevent generation to shape shrinkage error; 3 prevent to happen note model to be out of shape; 4 prevent to produce drawing of patterns to be out of shape; 5 make the mould makes an error fall to the smallest; The 6 errors that avoid mould precision; 7 maintain mould precision. Prevent generation to shape shrinkage error because shrinkage can produce change because of noting model pressure, accordingly, to monotype antrum mould, model the modular antrum pressure inside antrum should agree as far as possible. As to how model antrum mould, model the modular antrum pressure between antrum should differ very small. In monotype antrum much runner or much model below the circumstance of antrum much runner, must inject with the same pressure that note model, make model antrum pressure is consistent. For this, must ensure make runner position balanced. To make model the modular antrum pressure inside antrum is consistent, the pressure that had better make runner entrance is in keeps consistent. What runner handles pressure is balanced with flow path obstruction of medium going from place to place is concerned. So, achieve in runner pressure balanced before, answer to make flow path balanced first. Because fuse-element temperature and mould temperature are right actual shrinkage produces an effect, because this is when design nicety Injection Mold Tooling antrum, shape certainly to facilitate condition, must the permutation of attention antrum. Because melt is plastic,take quantity of heat into the mould, and the temperature gradient of the mould distributings is commonly around be in model of antrum all round, submit the homocentric round form that is a center with mainstream path. Accordingly, flow path is balanced, model antrum is arranged and with mainstream path shape forms the homocentric circle that is a center wait for design measure, to reducing each model the shrinkage error between antrum, expand shape conditional limit and reducing cost is necessary. Of accurate Injection Mold Tooling model antrum arranges means to should satisfy flow path balanced ask with what rank two sides for the center with mainstream path, and must collect path of mainstream of in order to to be symmetrical line model antrum ranges way. Because mould temperature is right,shape the impact of shrinkage is very big, at the same time immediate also impact notes the mechanical performance of model goods, still can cause goods surface see things in a blur to wait for all sorts of shaping blemish, because this must make the mould maintains,be inside temperature limits of the regulation, and make mould temperature does not change along with time change even. Much model of antrum mould each model the difference in temperature between antrum also must not produce change. For this, the temperature that pair of moulds must be adopted to heat in mould design or cools controls measure, and to make mould each model the difference in temperature between antrum narrows as far as possible, must notice lukewarm accuse - the design of cooling loop. Be in model antrum, model core is lukewarm in dominating return circuit, basically have series connection refrigeration and shunt-wound refrigeration means of two kinds of join. From the point of hot exchange efficiency, the flow of cooling water should show turbulent flow. But in shunt-wound and cooling loop, the flow-rate ratio in a return circuit that makes billabong cools in series connection the flow in loop is little, may form laminar flow so, and differ also phasing is the same as the discharge in entering every loop actually. Because enter the cooling water temperature of each loop identical, each model the temperature of antrum also answer identical, but because of each loop actually medium discharge differs, and the cooling power of every loop is not same also, the temperature that causes each model antrum agrees impossibly also. The weakness that uses return circuit of series connection refrigeration is the muscularity of block of going from place to place of cooling water, of foremost face model the cooling water temperature that antrum entrance is in is the same as finally model the cooling water temperature that antrum entrance is in has apparent difference. The difference in temperature of cooling water passageway changes because of the size of discharge. To small-sized and accurate Injection Mold Tooling, general from drop mould cost consideration, introduce series cooling return is more appropriate. Mould antrum and model the system of cooling water return with due and respective core. On the design of cooling loop, as a result of from model antrum and model the quantity of heat that absorbs on core is different, the hot obstruction of loop structure is different also, model antrum and model lukewarm meeting produces the water that core entrance is in very big difference in temperature. If use same system, cooling loop design is more difficult also. Additional, when taking the way to deal with a situation that prevents warp to fixing model product, also hope antrum and model the difference in temperature that keeps certain between core. Accordingly design antrum and model the adjustment that temperature should have respectively when the cooling loop of core and control. The maintenance of mould precision is noting the mould precision below the model pressure, force that lock up a model to maintain, when designing mould structure, must consider to be opposite model antrum spare parts undertakes grinding, abrade the feasibility that waits for treatment with polishing. Although model antrum, model the requirement that the treatment of core has achieved high accuracy, and what shrinkage also predicts with place is same, but as a result of the central deflection when shaping, dimension is very inaccessible related the goods inside that its shape, outboard the design requirement of plastic component. Move to maintain, the dimension precision that decides model antrum to go up in cent face, besides center of the guide pillar with commonly used place of setting convention mould, guide-post bushing, still must add outfit taper fixed position is sold or the fixed position such as wedge deputy, in order to ensure fixed position precision is accurate, reliable. The material that makes accurate Injection Mold Tooling should choose mechanical property the tool of high grade alloy of decrescent of tall, hot squirm steel, make model the hardness that the mould material of antrum, runner should choose to pass strict heat treatment tall, wearability good, corrosion resistance is strong, heatproof metabolic material, consider the difficult easy sex that machining, report machines and economy even at the same time. Change to prevent to produce effectiveness for a given period of time and change the dimension precision of the mould, the temper that must stipulate when designing a pattern the remaining austenite that reduces mould material heat treatment is organized is handled or microtherm is handled. To accurate Injection Mold Tooling fragile spare parts, especially model antrum, model core fragile, want to consider repaired possibility when the design, still have in order to maintain a pattern after maintenance relatively high accuracy. Mould exhaust design is reasonable also be to decide mould precision is retentive one main factor. Accurate goods majority is use project plastic shape, in shape the contracts to assure plastic and good liquidity and plastic member consistency in the process asks the model is lukewarm commonly shape in certain limits ability. Pass when mould temperature tall, because mould fittings expands it is difficult to can bring about the aeriform eduction inside the model, cause a product to appear tired gas, scorch, the undesirable phenomenon such as short, because of this mould model antrum part design should be used more enchase fittings, the top gives fittings grinding the face should design air discharge duct to prevent to burn needle phenomenon. Designing accurate Injection Mold Tooling reasonably is the foundation that acquires accurate product and necessary premise. The measure that provides through defining a standard reasonably and public errand, adopt prevent to note model goods to produce shrinkage error, note model to be out of shape, drawing of patterns is out of shape, excessive edge, and ensure the technical measure such as mould precision, use the right accurate technology that note model, applicable project the equipment noting model of plastic material and nicety, make achieve first-rate to match, plastic to raising nicety quality, dependability and function, reduce manufacturing cost, raise manufacturing efficiency to have very important sense. CNC Milling