Product Shrinkage/Shrinkage Cavities

After demolding, the product dimensions are too small, or surface depressions and internal shrinkage cavities appear. Such defects mostly occur in thick-walled transition areas of the product and at the far end of the gate, gradually appearing during the cooling and setting stage. This problem causes product dimensions to exceed the tolerance range, affecting assembly accuracy and product function.

(1) In terms of shrinkage control: the resin has a large curing volume shrinkage rate, uneven volume shrinkage leads to internal stress and dimensional deviation. (2) Process factors: insufficient feeding compensation of the casting liquid, this factor affects the product's '2079851475616104453 and final quality. (3) In terms of process speed: too fast a curing rate causes shrinkage stress concentration, speed parameters affect the synchronization of material flow state and reaction progress.

(1) Formula optimization: add low-shrinkage additives or fillers to the formula, determine the optimal addition amount through small-batch tests and verify its impact on the comprehensive performance of the product. (2) Process control: control the curing rate, establish an online monitoring mechanism, set upper and lower parameter limits, and implement alarm management. (3) Implementation measures: set up a feeding liquid reservoir at the gate, formulate a specific operation plan based on actual production conditions and verify the implementation effect. (4) Parameter adjustment: appropriately reduce the casting temperature., note that after temperature reduction, it is still necessary to ensure that the material fully reacts or melts; adjust step by step and observe the effect. (5) Preventive measures: establish a shrinkage database, preset shrinkage compensation amounts according to product structure and material type, and regularly calibrate mold dimensions.

The core of shrinkage defects lies in the contradiction between material curing volume change and insufficient process compensation, which needs to be comprehensively controlled through formula optimization and process adjustment.