I can give you a lot of tips but the best advice will come if you post a video of yourself playing. We'd be able to see exactly what you are doing and probably give you a few tips to get you in the right direction.
What Toni said about having the hair too tight is a good point.
At what point in the bow does the bow bounce? Is it towards the tip? If so, it has to do with the tension that builds up when your arm is stretched with your hand in a certain position. The easiest solution for that is to get your violin higher up so that your arm doesn't have to travel as far to use that part of the bow.
I'd like to see how you are holding the bow and how much flexibility you have in your hand and fingers. The grip can be a big factor. Extra tension can cause bounce....