Conformal waterway cooling system for plastic impeller mold
Technical Field
The invention relates to a cooling system in the technical field of plastic impeller molds, in particular to a cooling system with a conformal waterway design.
Background
The plastic impeller is widely applied in the fields of 3C electronic products, white household appliances, automobiles and the like, and meanwhile, due to technical innovation and continuous improvement of product quality, the continuous pursuit of high-quality impellers in the fields determines that the plastic impeller is improved in terms of functional index parameters such as product size precision, dynamic balance and the like, and the technology for manufacturing and forming the plastic impeller is also challenged newly. In injection molding of plastic parts, temperature of a mold is regulated by an external mold temperature machine and the like, corresponding media are controlled to flow into a waterway pipeline of the mold through a pipeline, and the temperature of the mold is regulated and controlled through heat transfer, so that whether the heat transfer in the link is balanced or not directly influences the shrinkage deformation of a molded product, and the product quality is influenced. The traditional plastic impeller mould belongs to a circular mould core structure, and because the reinforcing ribs of a plastic impeller product are more, the traditional waterway is generally processed by adopting drilling and milling and other machining modes, the waterway cannot be processed by bypassing and can only be transversely or longitudinally processed along a straight line, and the waterway cannot be designed along with the product equidistantly, so that the waterway is far from the distance of the product, after long-time circulation of water flow, the temperature of each part on the mould core is unbalanced, uneven temperature distribution causes uneven cooling of the product, and the final result causes deformation of the product.
In practical application, the final quality of the impeller type product is directly determined by 2 important parameters, one is the circular outline (end face runout, radial runout) of the product, and it determines whether the volume of the product is uniformly distributed on all angles. And secondly, the rotation unbalance of the product determines whether the quality of the product is uniformly distributed at all angles. At present, the outline (end face runout, radial runout) of a product produced by an impeller die adopting a traditional waterway scheme is basically controlled to be about 0.8mm, and after the tolerance of part of the product exceeds, the product has to be corrected by adopting modes such as post-processing and the like, so that the production cost is further increased; in the aspect of controlling the rotation unbalance value of the plastic impeller product, the rotation unbalance value of the traditional impeller product is generally about 12mg.mm, the ideal value required by the drawing is below 4mg.mm, when the rotation unbalance value exceeds the standard in the production of the product, the dynamic balancing machine is generally adopted for measurement, the balancing weight is added for balance correction, and part of the product always needs to be checked and compensated for correction for 2-3 times, so that the production cost is relatively remarkable due to the production mode of measurement correction.
On the other hand, in order to solve the quality problem that the product is deformed due to uneven cooling, the conventional waterway mold intentionally prolongs the molding cooling time of the plastic part, so that the improvement effect is extremely limited, and the production efficiency of the product is obviously reduced. In the impeller mold of the traditional waterway, the production period of the product is about 60 seconds, sometimes, in order to improve the deformation of the product, the injection molding period is even more than 75 seconds, according to estimation, about 48-60 seconds of the whole period are all spent on cooling, the cooling period of the plastic part occupies about 80% of the whole molding period, and obviously, the cooling time cost is relatively high.
Disclosure of Invention
The invention provides a conformal waterway cooling system for a plastic impeller die, which aims at the defects of the prior art, not only can reduce the injection molding period of a product to about 40-50 seconds in the conventional cooling scheme of about 60-70 seconds, but also can reduce the defective rate of the product caused by uneven cooling.
The invention is realized by the following technical scheme that the die cavity comprises a die cavity, a die core, a die cavity shape-following connecting waterway, a die cavity shape-following shunt waterway, a die cavity inner arc waterway, a die cavity outer side water inlet pipeline, a die cavity outer side water outlet pipeline, a spiral annular waterway, a die cavity inner side water inlet pipeline, a die cavity inner side water outlet pipeline, a die core upper side annular waterway, a die core parallel waterway, a die core bridging waterway, a die core lower side annular waterway, a die core water inlet pipeline and a die core water outlet pipeline, wherein the die cavity and the die core are of circular structures, the die cavity shape-following connecting waterway, the die cavity shape-following shunt waterway, the die cavity inner side arc waterway, the die cavity outer side arc waterway and the spiral annular waterway are all arranged in the die cavity, the die cavity outer side arc waterway is arranged outside the die cavity, the die cavity inner side arc waterway and the spiral annular waterway are arranged in the die cavity, the die cavity outer side water inlet pipeline is connected with the die cavity inner side arc waterway through the die cavity shape-following connecting waterway, the die cavity inner side arc waterway is connected with the die cavity outer side water outlet pipeline through the die cavity shape-following connecting waterway, the die cavity inner side arc waterway is connected with the die cavity water outlet pipeline, and the die cavity inner side arc waterway is connected with the water outlet pipeline; the core upside annular waterway, the core parallel waterway and the core downside annular waterway are sequentially arranged in the core from top to bottom, the core upside annular waterway and the core parallel waterway are connected through a core bridging waterway, the core parallel waterway and the core downside annular waterway are connected through a core bridging waterway, a core water inlet pipeline is connected with a water inlet of the core downside annular waterway, and a core water outlet pipeline is connected with a water outlet of the core upside annular waterway.
Further, in the invention, the inner diameters of the cavity inner arc-shaped water path, the cavity outer water inlet pipeline and the cavity outer water outlet pipeline are the same.
Further, in the present invention, the core parallel waterway is a double-pipe structure.
Furthermore, in the invention, the cavity shape-following water diversion paths are connected in parallel, and the shape, the number and the spacing of the cavity shape-following water diversion paths can be determined by simulation calculation results.
Compared with the prior art, the invention has the following beneficial effects:
first, the mold of the invention utilizes the existing 3D metal printing molding technology to process the molded part of the plastic impeller mold. Therefore, the waterway can be designed along the contour of a product, the easy-shrinkage position of the rib position can be combined with the analysis results of mold flow software such as Moldflow, the shape and the split diameter of the cooling waterway are optimized, and when part of the mold core part cannot be set due to the fact that iron materials are too thin and a traditional cooling scheme can be adopted, the special-shaped along-shape waterway design scheme can be adopted, and the cooling effect is enhanced.
Secondly, in the aspect of product quality control, the mold core part designed along with the shape waterway is adopted, so that the internal cooling of the mold core part is balanced, the quality of a plastic impeller product is improved, the standard can be controlled to be about 0.4mm in the appearance profile (end face runout and radial runout) of the product, and the quality control aspect of the rotation unbalance of the product also reaches the standard below 4mg.mm required by a drawing.
Thirdly, from the aspect of part processing, the 3D printing technology is adopted to process the part with the shape-following waterway, so that the machining links of a die core part are reduced, the processing efficiency of the part is greatly improved, the development period of a die is shortened, and the productivity of annual production die quantity of a factory is improved.
Fourth, from the effect analysis that follows the shape water route to use, the balanced arrangement of water route in the mould benevolence can guarantee the shaping temperature of optimum product like this, and the balanced regulation and control of mould temperature can reduce the injection moulding cycle of product about 60-70 seconds in traditional cooling scheme to about 40-50 seconds, the production cycle saves the time of adopting traditional cooling scheme 30%, in the aspect of the quality of product, can reduce the defective rate that the product appears because of the uneven cooling, greatly promoted the production yield of product, and can save for the cost of defective products measurement and correction too, very big saving plastic impeller manufacturing cost has promoted the profit rate of product.
Drawings
FIG. 1 is a schematic illustration of the application of the present invention to the cavity side of a plastic impeller mold;
FIG. 2 is a schematic view of a 3D waterway at the cavity side of a plastic impeller mold in accordance with the present invention;
FIG. 3 is a schematic illustration of the application of the present invention to the core side of a plastic impeller mold;
FIG. 4 is a schematic view of a 3D waterway on the core side of a plastic impeller mold in accordance with the present invention;
wherein: 1. the mold cavity comprises a mold cavity, a 21 mold cavity shape-following connecting waterway, a 22 mold cavity shape-following shunt waterway, a 23 mold cavity inner arc waterway, a 24 mold cavity outer arc waterway, a 25 mold cavity outer side water inlet pipeline, a 26 mold cavity outer side water outlet pipeline, a 31, a spiral annular waterway, a 32, a mold cavity inner side water inlet pipeline, a 33, a mold cavity inner side water outlet pipeline, a 4, a mold core, a 51, a mold core upper side annular waterway, a 52, a mold core parallel waterway, a 53, a mold core bridging waterway, a 54, a mold core lower side annular waterway, a 55, a mold core water inlet pipeline, a 56 and a mold core water outlet pipeline.
Detailed Description
The following describes embodiments of the present invention in detail with reference to the accompanying drawings, and the embodiments and specific operation procedures of the present invention are given by this embodiment on the premise of the technical solution of the present invention, but the protection scope of the present invention is not limited to the following embodiments.
Examples
1-4, the invention comprises a cavity 1, a core 4, a cavity follow-up connecting waterway 21, a cavity follow-up shunt waterway 22, a cavity inner arc waterway 23, a cavity outer arc waterway 24, a cavity outer side water inlet pipeline 25, a cavity outer side water outlet pipeline 26, a spiral annular waterway 31, a cavity inner side water inlet pipeline 32, a cavity inner side water outlet pipeline 33, a core upper side annular waterway 51, a core parallel waterway 52, a core bridging waterway 53, a core lower side annular waterway 54, a core water inlet pipeline 55 and a core water outlet pipeline 56, wherein the cavity 1 and the core 4 are all in a circular structure, the cavity follow-up connecting waterway 21, the cavity follow-up shunt waterway 22, the cavity inner side arc waterway 23, the cavity outer arc waterway 24 and the spiral annular waterway 31 are all arranged in the cavity 1, the cavity outer side arc waterway 24 is arranged outside the cavity 1, the cavity inner side annular waterway 31 is arranged inside the cavity 1, the cavity outer side water inlet pipeline 25 is connected with the cavity outer side arc waterway 24 through a pipeline, the cavity outer side water outlet pipeline 26 is connected with the inner side arc waterway 23 through the cavity follow-up connecting waterway 21, the cavity outer side arc waterway 31 is connected with the cavity outer side arc waterway 31 through the cavity follow-up connecting waterway 31, the cavity outer side water inlet pipeline 31 is connected with the cavity outer side arc waterway 31 through the annular waterway 31; the core upper side annular waterway 51, the core parallel waterway 52 and the core lower side annular waterway 54 are sequentially arranged in the core 4 from top to bottom, the core upper side annular waterway 51 and the core parallel waterway 52 are connected through a core bridging waterway 53, the core parallel waterway 52 and the core lower side annular waterway 54 are connected through a core bridging waterway 53, a core water inlet pipeline 55 is connected with a water inlet of the core lower side annular waterway 54, and a core water outlet pipeline 56 is connected with a water outlet of the core upper side annular waterway 51; the inner diameters of the cavity inner arc-shaped waterway 23, the cavity outer arc-shaped waterway 24, the cavity outer water inlet pipeline 25 and the cavity outer water outlet pipeline 26 are the same, and the core parallel waterway 52 is of a double-tube structure.
According to the invention, the design of the conformal waterway at the side of the cavity 1 is combined with the outline of the product, the conformal waterway and the arc waterway are combined for cooling, the cross-sectional area and the shape of the cooling shunt waterway at the inner side and the outer side of the product are adjusted according to the die flow shrinkage analysis results of the software such as Moldflow and the like. The cooling split flow pipeline on the inner side and the outer side of the product is connected by adopting a multi-port connection along with a pipeline waterway, and the number and the interval of ports of the connecting waterway are adjusted according to the shrinkage results of the die flow analysis of the software such as the product Moldflow and the like. The conformal waterway scheme can reasonably carry out a plurality of arrays or rotary copying on the cooling scheme around the center of the product according to the die flow shrinkage analysis results of the software such as Moldflow and the like.
The waterway scheme in the cavity 1 is designed by a conformal waterway scheme, wherein the waterway profile at the inner side of the cavity is designed by a spiral annular waterway scheme of a spiral annular waterway 31, and the top characteristics of the center of the material handle and the impeller are fully cooled; in addition, the design of the waterway at the outer side of the cavity takes the outline of the product into consideration, and the cooling is performed by combining the conformal waterway with the arc waterway. Considering the flow of the shape-following waterway, as shown in fig. 1 and 2, the waterway scheme at the middle position of the product adopts the scheme of the arc waterway 23 at the inner side of the cavity, which has the same cross-sectional area as the water inlet and outlet pipeline, so as to ensure the full cooling of the inside of the product, in addition, the outer side of the product adopts the scheme of the arc waterway 24 at the outer side of the same cavity, and the connecting of the arc waterway 23 at the inner side of the cavity and the arc waterway 24 at the outer side of the cavity is connected with the water outlet of the waterway 21 at the outer side of the cavity through the shape-following connecting waterway 21 of the cavity, and the multi-port flow distribution of the arc waterway 23 at the outer side of the cavity is realized through the shape-following flow distribution waterway 22 of the cavity, thereby avoiding the phenomena of uneven cross-section and uneven internal cooling of the waterway caused by uneven water distribution waterway, which only acts on the partial cooling of the waterway at the outer side of the mold as shown in fig. 1, and the rest of the cavity 1 is cooled through rotating and copying a plurality of the waterway schemes at the outer side of the cavity.
The design of the water path on the side of the core 4 is to consider cooling balance and the space for placing the ejection system of the product, the core 4 adopts the design scheme of the annular layering water path along with the shape, as shown in fig. 3 and 4, the annular water path along with the shape formed by the annular water path 51 on the upper side of the core solves the problem that the die core on the top of the core 4 cannot be arranged due to the thin traditional cooling scheme of the iron material, the middle part of the die core needs to be cooled by adopting a plurality of core parallel water paths 52, a plurality of core parallel water paths 52 are connected with the annular water path 51 on the upper side of the core through the core bridging water paths 53, the joint needs to be smooth and smooth, and the bottom feature of the product needs to be cooled in a reinforced mode, and the cooling is enhanced through the annular water path 54 on the lower side of the core.
The parts with the conformal waterway are manufactured by 3D printing technology, and the conformal waterway design scheme realizes the omnibearing regulation and control of the mold temperature of the product forming part.