Take a look at there are various style objects (SChartAxisStyle, SChartTickStyle) - take a look at the 'style' property on your axis. Here you can modify a number of properties, giving you a lot of control over how your axis looks. Here's an example of how to hide your labels & tick marks:
axis.style.majorTickStyle.showTicks = NO;
axis.style.majorTickStyle.showLabels = NO;
Here's some documentation that lists the properties you have available to you:
You may also want to subclass your axes and override the method -spaceRequiredToDrawWithTitle: to return 0 so that the chart doesn't leave any space for the axes.