The guide pillars mainly plays a guiding role in the mold to ensure that the molding surfaces of the core and the cavity do not touch each other under any circumstances, and the guide pillars cannot be used as a force-bearing part or a positioning part. In the following cases, when the injection is moved, the fixed mold will generate a huge lateral deflection force:

(1) When the wall thickness of the plastic parts is not uniform, the flow rate of the material passing through the thick wall is large, and a large pressure is generated here;

(2) The sides of the plastic parts are asymmetrical, such as a mold with a stepped parting surface, the back pressure on the opposite sides is not equal.