b. In-mold top-out force is small. When the ejected part of the fixed part of the plastic part is small, the spring is usually used as a force source. The top part of the mold is simple in structure, the mold cost is low, and the replacement is convenient, but the spring is easy to fail.
The mold is designed to be ejected in a fixed mold, a small plate is used to connect the top rod and the reset rod, and the spring is fixed to the middle of the connecting plate so that the top rod and the reset rod are subjected to uniform force during ejection and the reset rod is subjected to clamping When the force is reset, the ejector pin is not easy to get stuck. The material can be 45 steel. The selection of the spring must be based on the production of the product.
4 The design of distance-fixing type (automatic design of sprue feeding).
Distance-fixing type mainly restricts the sliding distance of the gate plate during mold opening, so that the gate material can be automatically taken out of the mold gate plate. The mold is poured on the fixed mold plate due to half of the flow passage, and the mold is poured. The port plate is relatively thin, and the gate plate needs to have a large sliding distance. Therefore, the mold is used outside the mold, the spring is used as a power source, and it is easy to install and has a simple structure inside the mold. This method is widely used in mold design. use.
The sprue pull rod must stop rotating, and the return spring should not be too elastic. It can ensure that the pull rod can be reset before closing the mold. Pay attention to the assembly direction of the opening edge of the sprue pull rod 8 so that the spout material falls off automatically.
5 gating system design.
The appearance of the product and the reason for the mold manufacturing. The mold is in the form of a direct spot gate. The glue is fed from the main core. This is due to the appearance of the product. The glue-in point is covered under the small cover and has no appearance effect.
In order to reduce the material for mold making, half of the runners are opened on the fixed mold base plate to serve two purposes.
6 Design points for ejector ejection.
The ejector ejector part is a part of the design features of the mold: using the rules of elliptical and circular geometry, and the principle of inclined roof ejector, the design is optimized, and the movable mold core inclined roof slanted slide ejector is used to release the mold, thereby greatly improving the ejection strength of the product. , To reduce the product's holding force on the mold core during demoulding and the possibility of deformation of the product's top surface when the ejector pin is ejected.
Suggestion: This demoulding method can be used when the product is elliptical or circular, the inner diameter is preferably ≥ φ30mm, the mold release stroke is not large, and the plastic parts shrink well when used.
The reset lever is flip-type, and is fixed on the push plate in the form of threads, and is screwed under the push plate. This mode is mainly to take into account that after the mold release operation is completed, the core is reduced when being reset by the reset lever. The impact force ensures that the threads on the core and the connecting rod are not damaged.
7 Cooling system and exhaust design.
Because polypropylene (PP) material is sensitive to temperature, the product is molded in the fixed part and less, so the fixed part of the mold will not consider the design of the cooling system; dynamic cooling system is designed for series cooling, using copper pipe inlay Cooling in series in the mold cooling hole.
(3) mold work process.
The mold is injection molded on the injection machine. At the same time, the cooling system cools the product in the mold cavity. The holding time of the injection machine ends. When the mold is opened, the I part surface is first opened under the action of the spring 12 on the outside of the mold. The spring force on the distance-feed material feed rod 8 is relatively small, so that it is pulled out under the spout of the spout material and the spout plate, and the stroke of the distance-to-distance sprue material feed rod 8 is completed, and the I parting surface is completed. The mold opening is continued, the water outlet material is taken out of the product, and the outlet material on the drawing rod of the nozzle plate is also pulled out. Since the outlet material is positioned at the opening edge of the drawing rod 8 downwards, the outlet material falls automatically, and the distance is pulled. The rod 8 is reset under the action of the spring 7, the I parting surface is separated, and the distance between the limiting pillar 16 is subdivided; the mold opening of the injection machine continues, the II parting surface is opened, and the movable mold plane is no longer on the reset lever. 33. The force is applied so that the push rod 3 and the reset lever 33 are ejected under the strong force of the spring to eject the product. When the mold opening operation of the injection machine is completed, the ejector starts to eject the mold. The push rod plate 25 of the mold is pushed by the ejector pin of the injection machine. To force the top rod 24 fixed on the core to drive the model Promote product completes the ejection, since the return lever 21 when the reset flip fixed to the push plate, thereby reducing the impact forces suffered when resetting the movable die core in the lower plunger 24 driven by an injection mold to complete the work.
3 mold assembly, processing points and debugging (1) more model core, the need for processing the installation of the core left assembly grinding margin.
(2) Movable core mandrel slanted sliding holes, the two plates need to be fixed together during processing to ensure the coaxiality.
(3) After assembly, make sure that the pusher plate is parked on the limit pin or at a distance of 1 mm just after the reset, so that the movable model core is completely reset, without affecting the internal structure of the product during molding.
(4) Pay attention to the direction of the sprue pull rod assembly. When the mold is installed on the injection molding machine, the sprue pulls the material opening side down.
4 Conclusion The overall structure of the three-plate mold in the mold design is difficult, using the automatic drop gate, mold distance outside the fixed type, fixed mold ejection, dynamic model core oblique top out of the design, which uses the dynamic model core inclined roof The design is more special, and it is extremely rare in the mold structure, and the design is reasonable. It eliminates the use of ejector sleeve or top plate ejector design, thereby reducing the difficulties in mold manufacturing, and solving the cylindrical and elliptical components in After the formation of a larger top force, for peer reference. Then, the water outlet material falls automatically, and the distance puller rod 8 is reset under the action of the spring 7, the I parting surface is separated, and the distance between the limiting column 16 is subdivided; the mold opening of the injection machine continues, and the II parting surface is opened. At the same time, the movable die plane no longer exerts force on the reset lever 33, so that the push rod 3 and the reset lever 33 spring out under the strong force of the spring to eject the product; when the mold opening operation of the injection machine is completed, the dynamic mold ejection operation starts, and the mold pushes The rod cushion plate 25 is pushed by the ejector jack, so that the top rod 24 fixed on the core is forced to drive the model core to push the product to complete ejecting, and the reset rod 21 is flipped and fixed on the push plate at the time of reset, thereby reducing the The impact force of the dynamic model core under the driving of the top rod 24 is reset, and the mold completes an injection work.
3 mold assembly, processing points and debugging (1) more model core, the need for processing the installation of the core left assembly grinding margin.
(2) Movable core mandrel slanted sliding holes, the two plates need to be fixed together during processing to ensure the coaxiality.
(3) After assembly, make sure that the pusher plate is parked on the limit pin or at a distance of 1 mm just after the reset, so that the movable model core is completely reset, without affecting the internal structure of the product during molding.
(4) Pay attention to the direction of the sprue pull rod assembly. When the mold is installed on the injection molding machine, the sprue pulls the material opening side down.
4 Conclusion The overall structure of the three-plate mold in the mold design is difficult, using the automatic drop gate, mold distance outside the fixed type, fixed mold ejection, dynamic model core oblique top out of the design, which uses the dynamic model core inclined roof The design is more special, and it is extremely rare in the mold structure, and the design is reasonable. It eliminates the use of ejector sleeve or top plate ejector design, thereby reducing the difficulties in mold manufacturing, and solving the cylindrical and elliptical components in After the formation of a larger top force, for peer reference.
The mold is designed to be ejected in a fixed mold, a small plate is used to connect the top rod and the reset rod, and the spring is fixed to the middle of the connecting plate so that the top rod and the reset rod are subjected to uniform force during ejection and the reset rod is subjected to clamping When the force is reset, the ejector pin is not easy to get stuck. The material can be 45 steel. The selection of the spring must be based on the production of the product.
4 The design of distance-fixing type (automatic design of sprue feeding).
Distance-fixing type mainly restricts the sliding distance of the gate plate during mold opening, so that the gate material can be automatically taken out of the mold gate plate. The mold is poured on the fixed mold plate due to half of the flow passage, and the mold is poured. The port plate is relatively thin, and the gate plate needs to have a large sliding distance. Therefore, the mold is used outside the mold, the spring is used as a power source, and it is easy to install and has a simple structure inside the mold. This method is widely used in mold design. use.
The sprue pull rod must stop rotating, and the return spring should not be too elastic. It can ensure that the pull rod can be reset before closing the mold. Pay attention to the assembly direction of the opening edge of the sprue pull rod 8 so that the spout material falls off automatically.
5 gating system design.
The appearance of the product and the reason for the mold manufacturing. The mold is in the form of a direct spot gate. The glue is fed from the main core. This is due to the appearance of the product. The glue-in point is covered under the small cover and has no appearance effect.
In order to reduce the material for mold making, half of the runners are opened on the fixed mold base plate to serve two purposes.
6 Design points for ejector ejection.
The ejector ejector part is a part of the design features of the mold: using the rules of elliptical and circular geometry, and the principle of inclined roof ejector, the design is optimized, and the movable mold core inclined roof slanted slide ejector is used to release the mold, thereby greatly improving the ejection strength of the product. , To reduce the product's holding force on the mold core during demoulding and the possibility of deformation of the product's top surface when the ejector pin is ejected.
Suggestion: This demoulding method can be used when the product is elliptical or circular, the inner diameter is preferably ≥ φ30mm, the mold release stroke is not large, and the plastic parts shrink well when used.
The reset lever is flip-type, and is fixed on the push plate in the form of threads, and is screwed under the push plate. This mode is mainly to take into account that after the mold release operation is completed, the core is reduced when being reset by the reset lever. The impact force ensures that the threads on the core and the connecting rod are not damaged.
7 Cooling system and exhaust design.
Because polypropylene (PP) material is sensitive to temperature, the product is molded in the fixed part and less, so the fixed part of the mold will not consider the design of the cooling system; dynamic cooling system is designed for series cooling, using copper pipe inlay Cooling in series in the mold cooling hole.
(3) mold work process.
The mold is injection molded on the injection machine. At the same time, the cooling system cools the product in the mold cavity. The holding time of the injection machine ends. When the mold is opened, the I part surface is first opened under the action of the spring 12 on the outside of the mold. The spring force on the distance-feed material feed rod 8 is relatively small, so that it is pulled out under the spout of the spout material and the spout plate, and the stroke of the distance-to-distance sprue material feed rod 8 is completed, and the I parting surface is completed. The mold opening is continued, the water outlet material is taken out of the product, and the outlet material on the drawing rod of the nozzle plate is also pulled out. Since the outlet material is positioned at the opening edge of the drawing rod 8 downwards, the outlet material falls automatically, and the distance is pulled. The rod 8 is reset under the action of the spring 7, the I parting surface is separated, and the distance between the limiting pillar 16 is subdivided; the mold opening of the injection machine continues, the II parting surface is opened, and the movable mold plane is no longer on the reset lever. 33. The force is applied so that the push rod 3 and the reset lever 33 are ejected under the strong force of the spring to eject the product. When the mold opening operation of the injection machine is completed, the ejector starts to eject the mold. The push rod plate 25 of the mold is pushed by the ejector pin of the injection machine. To force the top rod 24 fixed on the core to drive the model Promote product completes the ejection, since the return lever 21 when the reset flip fixed to the push plate, thereby reducing the impact forces suffered when resetting the movable die core in the lower plunger 24 driven by an injection mold to complete the work.
3 mold assembly, processing points and debugging (1) more model core, the need for processing the installation of the core left assembly grinding margin.
(2) Movable core mandrel slanted sliding holes, the two plates need to be fixed together during processing to ensure the coaxiality.
(3) After assembly, make sure that the pusher plate is parked on the limit pin or at a distance of 1 mm just after the reset, so that the movable model core is completely reset, without affecting the internal structure of the product during molding.
(4) Pay attention to the direction of the sprue pull rod assembly. When the mold is installed on the injection molding machine, the sprue pulls the material opening side down.
4 Conclusion The overall structure of the three-plate mold in the mold design is difficult, using the automatic drop gate, mold distance outside the fixed type, fixed mold ejection, dynamic model core oblique top out of the design, which uses the dynamic model core inclined roof The design is more special, and it is extremely rare in the mold structure, and the design is reasonable. It eliminates the use of ejector sleeve or top plate ejector design, thereby reducing the difficulties in mold manufacturing, and solving the cylindrical and elliptical components in After the formation of a larger top force, for peer reference. Then, the water outlet material falls automatically, and the distance puller rod 8 is reset under the action of the spring 7, the I parting surface is separated, and the distance between the limiting column 16 is subdivided; the mold opening of the injection machine continues, and the II parting surface is opened. At the same time, the movable die plane no longer exerts force on the reset lever 33, so that the push rod 3 and the reset lever 33 spring out under the strong force of the spring to eject the product; when the mold opening operation of the injection machine is completed, the dynamic mold ejection operation starts, and the mold pushes The rod cushion plate 25 is pushed by the ejector jack, so that the top rod 24 fixed on the core is forced to drive the model core to push the product to complete ejecting, and the reset rod 21 is flipped and fixed on the push plate at the time of reset, thereby reducing the The impact force of the dynamic model core under the driving of the top rod 24 is reset, and the mold completes an injection work.
3 mold assembly, processing points and debugging (1) more model core, the need for processing the installation of the core left assembly grinding margin.
(2) Movable core mandrel slanted sliding holes, the two plates need to be fixed together during processing to ensure the coaxiality.
(3) After assembly, make sure that the pusher plate is parked on the limit pin or at a distance of 1 mm just after the reset, so that the movable model core is completely reset, without affecting the internal structure of the product during molding.
(4) Pay attention to the direction of the sprue pull rod assembly. When the mold is installed on the injection molding machine, the sprue pulls the material opening side down.
4 Conclusion The overall structure of the three-plate mold in the mold design is difficult, using the automatic drop gate, mold distance outside the fixed type, fixed mold ejection, dynamic model core oblique top out of the design, which uses the dynamic model core inclined roof The design is more special, and it is extremely rare in the mold structure, and the design is reasonable. It eliminates the use of ejector sleeve or top plate ejector design, thereby reducing the difficulties in mold manufacturing, and solving the cylindrical and elliptical components in After the formation of a larger top force, for peer reference.
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