What is the function and structure of leader pin in mould?What are the requirements?
When working, the moving template often slides back and forth on the pull rod and opens and closes the mould, so that the motion can run normally and the contact position of the moving and fixed template is correct.Leader pin and guide sleeve are set on the moving and fixed formwork to ensure the correct alignment of the cavity between two moving and fixed formwork.
The front end of the leader pin should be 3 ° ~ 5 ° taper Angle.If the guide cylinder is designed to be conical, the position of the two templates will be more accurate.Because the sliding coordination between leader pin and guide sleeve is a frequent sliding in and out, the following requirements should be put forward.
The leader pin shall have good lubrication performance and shall be provided with lubricating oil groove if necessary.
In order to ensure the working strength of guide column, it is required that the fixed part diameter of guide column is 1.5 ~ 2 times the diameter of the working part of leader pin.
The roughness Ra of the working face of the waveguide column should not be greater than 0.63pm.The workface should be wear-resistant, and at the same time should have a certain degree of hardness, surface hardness after heat treatment
For 50 to 55 HRC.