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Comprehensive analysis of six elements of injection molding processing shape of injection molded parts

by:Vowin Rapid Prototyping     2023-02-13
For the analysis of the six elements of injection molded parts, Shanghai Mulan Injection Molding Factory initially analyzed the six elements separately, and it should be implemented in the analysis. The specific shape analysis process can be carried out item by item, but it still needs to be summed up. This is the comprehensive analysis of the 'six elements' of the shape of injection molded parts.





1. The distinction between the six elements and the twelve sub-elements


The shape analysis of injection molded parts is summarized into six major elements, which are further divided into twelve sub-elements, and the contents of each two sub-elements are both similar and different. Such as 'shape' and 'obstacle body' elements, they are all factors belonging to the shape of injection molded parts. The 'shape' element only affects the shape, size and quantity of the cavity and core of the injection mold, and will not affect the movement of the mold mechanism, while the 'obstacle' element does the opposite. In other words, the 'body' is the macroscopic shape of the injection molded part, and the 'obstacle body' element is the microscopic shape. Another example is the 'hole and groove' element, which all belong to the shape of the hole and groove on the injection molded part. The 'hole' is a hole with a complete shape, and the 'groove' hole can have gaps. Another example is the 'appearance and defect' elements, which are all trace factors. The 'appearance' element refers to the molding traces of the mold structure, which can be retained, but it is not allowed on the surface with appearance requirements. The element of 'defect' refers to traces of defects or traces of ills, which are traces that are not allowed to exist. Another example is the 'Movement and Intervention' element, they all have elements about movement. 'Motion' refers to the form of a single movement of the mold mechanism, such as parting movement, core pulling movement, demoulding movement and auxiliary movement, etc. 'Interference' is the result of the collision between the two movements. Another example is the 'plastic and batch' element. The 'plastic' element refers to the model of the polymer material of the injection molded part, while the 'batch' element refers to the output of the injection molded part within a certain period of time.


2. Graphic method for comprehensive analysis of six elements of injection molded parts


For the analysis of the six elements of injection molded parts, Shanghai Mulan Injection Molding Factory can use the graphic method to mark for the convenience of analysis and inspection. Specifically, on the 2D part drawing of the injection molded part, the found elements are marked on the drawing with element symbols. It is good to mark some relevant dimensions. Such as a hole or a groove, the symbol of a hole or groove can be marked below the dimension line of the hole or groove. Such as 'obstacle body', the symbol of the obstacle body can be marked below the height dimension line of the obstacle body. For features without dimensions, you only need to label the feature symbol.





3. Cases of comprehensive analysis of the shape elements of injection molded parts


The comprehensive analysis of the shape elements of the injection molded parts is to analyze all the six elements of the injection molded parts in place, and mark them on the 2D part drawing of the injection molded parts with the element symbols.


Comprehensive element analysis of pipe joint shape. The pipe joint has a 40mm bow height 'obstacle body', boss 'obstacle body', 'type hole', 'deformation', 'dislocation' on the cylindrical surface, 'interference' between core pulling and reset movement, ABS 'plastic' and medium The 'batch' element, the influence of the shape elements of the pipe joint needs to be considered when formulating the structural scheme of the injection mold. Only by dealing with the relationship between the structure of the injection mold and the shape elements, can a high-quality mold be designed and a qualified product be processed by injection molding.


Analysis of the comprehensive elements of the main part of the lock with light box, the 'obstacle body' element: it is a dominant 'obstacle body', these two dominant 'obstacle bodies' prevent the normal demoulding of the main part, and the holes and grooves cause the main part to be removed obliquely Due to the oblique off-line of the 'obstacle body', the mold core of the main part that is often demoulded becomes an 'obstacle body' that blocks its demoulding.


Movement and interference elements, the core-pulling and reset movement of the square hole core formed by injection molding and the movement of the molding hole insert will produce interference when they are carried out at the same time. It is because the core-pulling distance of the core is greater than 52mm. If the core and the insert move at the same time, the core will not have time to complete the movement, resulting in interference. Appearance elements, the main components are installed on the front of the car so that people can see it, and the orange peel pattern on the front needs to have appearance requirements. However, the bottom surface of the front groove can allow demoulding traces of the ejector pin, because the two grooves are equipped with cover plates to cover the demoulding traces. Plastic parts processing and batch factors The material of plastic parts processing is 30% glass fiber reinforced polyamide, and the shrinkage rate is 1%; the projected area of ​​the target part is 23034m㎡; the net weight is 310g, and the gross weight is more than 320 grams; the injection volume of plastic is large; use XS -ZY-230 injection machine, the batch is very large.





The design of the injection mold of Shanghai Mulan Injection Molding Processing Factory is based on the shape, size and characteristics of the injection molded parts, so the shape, size and characteristics of the injection molded parts must have some factors that determine the structure of the injection mold. There are six major elements in the shape analysis of injection molded parts, which are obtained on the basis of summarizing the shape and size characteristics of injection molded parts. The first step in mold structure design is to analyze the shape of injection molded parts. Only after the shape analysis of injection molded parts is thorough and complete can a good injection mold structure be designed. In other words, the mold structure design can be complete and in place only if the analysis of the six major elements on the injection molded parts is complete and in place. If the analysis of the six major elements on the injection molded parts is missing, then the mold structure will definitely be missing. If there is an error in the analysis of the six major elements on the injection molded part, then the mold structure must be wrong.
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