How much do you know about the little-known casting process of large cast iron platforms?
The working surface of a large cast iron platform must not have defects such as sand holes, blowholes, cracks, slag inclusions, shrinkage porosity, scratches, bumps, or rust spots that severely affect its appearance and performance. Construction of the refractory lining for the large cast iron platform furnace: Check whether the furnace bottom ring, furnace mouth ring, and coil refractory materials are intact, and whether the ejection block is in good condition. If there are issues such as cracks or fissures, repair or replace them. Remove debris from the furnace and blow away surface dust. Use A76 material to construct the iron outlet and slag removal port, shaping it according to the required form. Poke several holes in the material surface to allow gas discharge, and seal the vent holes with dry material. Hole size: ~50mm. Install the furnace bottom leakage spider web. First, lay the separation surface material, tilt the furnace to a certain angle, and have one person inside the furnace pass a stainless steel rod through the reserved hole to the furnace bottom to secure the leakage spider web. Lay the furnace bottom material for the large cast iron platform in layers of 80–120 mm,

Production requirements and usage instructions for large cast iron platforms: Suitable for various inspection tasks, serving as a reference plane for precision measurements, primarily used as a reference surface for inspecting mechanical workpieces, checking dimensional accuracy or behavior. Large cast iron platforms are indispensable planar reference tools for layout and inspection in mechanical manufacturing. Due to the small actual contact area, even under very light loads, significant unit pressure can occur. Surface roughness varies.
To prevent overall deformation of the large cast iron platform, after use, remove the workpiece from the platform to avoid prolonged heavy pressure. When the platform is not in use, promptly clean the working surface, apply a layer of rust-proof oil, cover it with anti-rust paper, and use the platform’s outer packaging to cover it, protecting the working surface from daily damage. The platform should be installed in a ventilated, dry environment, away from heat sources, corrosive gases, and corrosive liquids. The platform should undergo regular periodic inspections according to standards, with the calibration cycle ranging from 6 to 12 months depending on the specific situation.
Seal the mouth of the large cast iron platform mold with a specialized sealing plate to prevent furnace charge from falling into the mold. Place the discharge funnel sieve, and during charging, screen out packaging bags and other debris. Evenly charge 100–120 mm of furnace wall material, compact it four times with a tamping fork to exhaust air, and repeatedly tamp and vibrate the surface charge until it reaches the height of the furnace mouth sealing material.
Under unit pressure, the wear of the large cast iron platform’s contact surface also varies with friction. Under unit pressure, repeated friction and wear follow a curve, as indicated by the curve, where the initial wear is significant. This is because the wear surface of the large cast iron platform is not smooth, the actual contact area is small, and the specific pressure is high. The scraping contact pattern remains in the initial wear stage, which is one of the primary reasons for the wear of the scraping contact pattern.
Since the coated sand for large cast iron platforms has excellent fluidity, the surface quality of the sand core is good, dense without looseness, and even with little or no coating application, the large cast iron platform can achieve good quality. Therefore, there is limited room for improvement in large cast iron platforms. Production verification shows no significant improvement in sticky sand issues.
For charge segregation, level the refractory material at the bottom of the large cast iron platform mold to a smooth surface, and loosen the furnace wall around. Install the sliding plane liner for the furnace wall (mica paper or ceramic fiber, with seams adhered smoothly using adhesive tape. Secure the mouth of the large cast iron platform with heavy objects, and press the material around the furnace bottom to secure the lower mold. Place the adjustment modules at three points 120° apart. Seat the descaled and polished mold steadily on the furnace bottom material. Align the furnace mouth with the mold mouth, and fix it at three points with inclined wooden blocks or welded iron plates.
Weiyue Machinery, Ms. Xie, 15350773479