Based on the fact that the magnitude and direction of the stress formed by the solidification of bearing Babbitt alloy are important factors that directly affect the bonding strength between Babbitt alloy and matrix, a new water cooling process is formulated. The cooling direction is changed from horizontal sequential cooling to vertical sequential cooling to improve the bonding strength between tungsten and matrix.
During gravity casting, vertical water cooling is adopted from the radial middle of the bearing bush and both ends of the bearing bush at the same time, so that the direction of shrinkage stress changes from radial direction to circumferential direction, and the bonding strength of the joint surface is improved. The cooling direction is shown in Figure 1.
In the process of vertical water cooling of Babbitt bearing alloy, solid phase zone, solidification zone and liquid phase zone along the circumferential direction are formed, and the section is shown in Fig. 2. During liquid solidification of Babbitt alloy, the stress formed in the vertical direction is greater than that in the horizontal order. It can effectively reduce the tire separation between Babbitt and matrix, improve the qualified rate of Babbitt casting and improve the production efficiency.