Install the four axis square gear box. 1. The casting shall be subject to artificial aging treatment, and the surface shall be smooth and smooth, without any casting defects such as air holes, sand holes, slag inclusions, etc. 2. Casting shall comply with GB6414. 3. Surface sandblasting. 4. Undeclared chamfer: 0.5X45 ° 5. Undeclared fillet R1-3. 6. Castings shall be free of edges, corners, burrs, etc. 7. Surface painting. 8. Casting