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lingua italianaThe guide post and guide bush are important components of the injection mold, and the structure of the guide post generally has two forms:
1) Single-section guide post: The size of the fixed part of this guide post is the same as that of the guide part, and there are two oil grooves in the guide part to store lubricating oil. For molds with low requirements, no oil groove is required. This guide post has a simple structure and is easy to manufacture, but if the guide post is deformed and bent, the guide post hole will be damaged when withdrawing. Generally suitable for simple molds.
2) Stepped guide post: The size of the fixed part of the guide post and the formwork is larger than that of the guide part, and it is in the shape of a step-because of the existence of this step, the guide post hole will not be damaged when the guide post is bent and withdrawn. Generally suitable for large molds with high precision requirements.
Design principles of guide pillars
1) The length of the guide post must be 6.8mm higher than the end face of the punch to ensure that the punch enters the cavity after the guide post is guided.
2) In order to make the guide post enter the guide hole smoothly, the front end of the guide post should be made into a conical or spherical pilot part.
3) The diameter of the guide post should be determined according to the size of the mold, and the guide post should have sufficient bending strength.
4) The diameter of the fixed section of the guide post should be equal to the outer diameter of the guide sleeve to facilitate assembly and processing to ensure coaxiality.
5) The guide post should have a hard and wear-resistant surface, and a tough and not easy-to-break inner core, which can be treated with low carbon steel through carburizing and quenching, or carbon tool steel through annealing treatment.
6) In order to facilitate the demoulding of plastic parts, the guide post is generally installed on the fixed mold.
