Method for manufacturing stabilizer

A method for manufacturing a stabilizer,

• the stabilizer including:
• a main body bar that is elastically deformable
• a pair of connecting plates that are configured to be separately connected to a pair of left and right suspension devices;
• a pair of transition portions that connect both end portions of the main body bar and the pair of the connecting plates;
• and
• a sealing material that is arranged in each of the pair of the connecting plates;
• the method comprising:
• a forging step of forming the connecting plate by forging both end portions of a material tube, wherein
• the forging step includes:
• a first step of disposing a sealing metal plate inside both end portions of the material tube;
• a second step of integrally heating the both end portions of the material tube and the sealing metal plate at a temperature lower than a melting point of a material of the material tube and equal to or higher than a melting point of a material of the sealing metal plate in a state where the sealing metal plate is disposed inside the both end portions of the material tube,
• a third step of crushing the both end portions of the material tube in a radial direction to form the both end portions of the material tube into the pair of connecting plates and form a portion of the material tube other than the both end portions of the material tube into the main body bar and the pair of transition portions in a state where the heated sealing metal plate remains disposed between the both end portions of the heated material tube, and
• a fourth step of compressing and deforming the sealing metal plate in a thickness direction to form the sealing metal plate into a sealing material by following the third step, and
• the melting point of the material of the material tube is higher than the melting point of the material of the sealing metal plate.