@papito,

To hide the axis line and tick you can set the lineThickness and tickThickness to 0. Please check the below code snippet to hide the axis line and tick –

{
  title: "",
  tickThickness: 0,
  lineThickness: 0,
  labelFormatter: function(){
     return " ";
  }  
}

Also, kindly take a look at this JSFiddle for a working sample.

___________
Indranil Deo
Team CanvasJS