Two injection molded parts that can be assembled and disassembled are commonly known as male parts and female parts.
When the injection pressure and injection time of the male part increase, or the injection pressure and injection time of the female part decrease, the outer diameter of the male part increases, the inner diameter of the female part decreases, and the assembly and disassembly force required to cooperate with each other Increase.
Conversely, when the injection pressure and injection time of the male part decrease, or the injection pressure and injection time of the female part increase, the outer diameter of the male part becomes smaller, the inner diameter of the female part increases, and the assembly and disassembly force decreases .
Therefore, once the size of the mold is determined, it is necessary to adjust the matching assembly and disassembly force between the injection molded parts by adjusting the machine during production to ensure that the assembly and disassembly force is controlled within the range of specifications. However, the range of the machine that can be adjusted is limited. If the strength that can be adjusted cannot meet the product specifications, a mold change is required.
Due to various reasons, the injection pressure and injection time of the injection molding machine will fluctuate to varying degrees, and the assembly and disassembly force of the injection molded part will also fluctuate， then will need to improve the design of molding.
If two injection molded parts that need to cooperate with each other are on the same set of molds, the situation becomes more complicated. At this time, it is necessary to study the pressure and time of injection, which has a greater influence on the size of the piece to determine whether the assembly and disassembly force is too large or too small, whether to increase or decrease the pressure. It is better to adjust the pressure obtained by distributing each injection molded part by blocking the gate or runner of a part, so that it can be easily controlled during production.
In the same way, the size of injection molded parts can also be adjusted by adjusting the pressure and time. Adjusting the injection and holding time is the most commonly used and effective means.
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