Method for balancing a turbomachine rotor

1. A method for balancing a rotor, notably of a turbomachine, comprising:

determining an unbalancing mass and

chemical machining of the rotor, the chemical machining including

arranging a bath containing a chemical machining agent so that the bath has a capacity of heterogeneous material removal as a function of the depth in the bath, an amount of material removal at a first depth in the bath being greater than an amount of material removal at a second depth in the bath,

immersing the rotor in the bath, and

orienting the rotor in the bath taking account of the capacity of heterogeneous material removal so that the quantity of material removed from the rotor in a zone of the unbalancing mass is sufficient to balance the rotor.

2. The method according to claim 1 , further comprising:

identifying the direction of the unbalancing mass by a mark on the rotor;

attaching the rotor to a handling tool; and

suspending the rotor so that the mark is oriented in a vertical plane, then conveying the rotor and submerging the rotor in the chemical machining bath.

3. The method according to claim 2 , further comprising:

keeping the rotor in the bath for a sufficient period to remove a minimum quantity of material from the whole rotor.

4. The method according to claim 1 , wherein the chemical bath is nitric-acid based and hydrofluoric-acid based.

5. The method according to claim 4 , further comprising:

treating the rotor by anodization after the chemical machining.

6. The method according to claim 1 , wherein the capacity of heterogeneous material removal is such that there is a greater removal of material in a top portion of the bath as compared to a lower portion of the bath.