Archway casting is a large-scale frame structure produced through casting processes, named for its shape resembling a traditional archway. The product is mainly made of gray cast iron (HT200/HT250), ductile cast iron (QT400-15/QT500-7), or cast steel (ZG270-500/ZG340-640), and is manufactured through melting, sand mold forming (or resin sand molding), pouring, natural aging treatment, rough machining, and other procedures. Archway castings feature uniform wall thickness, complex structures, large bearing areas, and high stability, effectively meeting the performance requirements of foundational support structures for large machinery.
Product Applications
Archway casting products are widely used in various machinery requiring heavy support frames, with specific application scenarios including:
1. Metal cutting machine tools: Columns, beams, and beds of gantry milling machines, gantry planers, and boring and milling machining centers, providing a high-rigidity base for guide rail installation.
2. Construction machinery: Main support frames, counterweight bases, and operator cabin brackets of excavators, cranes, and pile driving machinery, ensuring operational stability.
3. Mining machinery: Machine body frames of crushers, screening equipment, and elevators, bearing heavy impact loads.
4. Transportation equipment: Bogie frames of railway vehicles and chassis frames of large trucks, providing high-strength connection interfaces.
5. Special equipment: Functional module support structures of printing machines, plastic machinery, and forging equipment, ensuring vibration resistance during processing.
Product Features
1. Complex structure forming capability: Casting processes can directly realize complex structures such as cavities, ribs, and connecting flanges, reducing subsequent machining and shortening manufacturing cycles.
2. Excellent vibration damping performance: The unique graphite flake (or nodular) structure of cast iron materials effectively attenuates vibrations generated during equipment operation, enhancing overall machine stability.
3. High load-bearing and wear resistance: Through material formula adjustments (such as adding alloying elements like Cr, Mo) and heat treatment processes, surface hardness can reach HB180-280, with wear-resistant layer thickness ≥5mm, meeting heavy-duty working conditions.
4. Cost advantage: Compared to forging or welding structures, casting processes have higher material utilization rates, especially suitable for small to medium batch production, reducing unit costs.
5. Personalized customization capability: Based on customer-provided drawings or samples, mold design can be adjusted to achieve customized development of hole positions, bosses, installation interfaces, and other structures.
Product Functions
1. Support and fixation: Provides high-rigidity installation reference surfaces for functional components of equipment (such as slides, worktables, hydraulic cylinders), ensuring overall geometric accuracy.
2. Load transmission: Evenly distributes cutting forces, impact forces, gravity, and other loads during equipment operation to the foundational structure, preventing deformation caused by stress concentration.
3. Guidance and positioning: After machining the casting sides, guide rail mounting surfaces are formed, cooperating with linear guides or plastic-coated plates to achieve precise linear motion of moving parts.
4. Energy absorption: The internal microporous structure of the material can absorb part of the impact energy, enhancing safety margins under sudden loads.
Product Technical Parameters
Parameter Category |
Specific Indicators |
Description |
Material Specifications |
Gray cast iron HT250, ductile cast iron QT400-15, cast steel ZG270-500 |
Material selection based on mechanical performance requirements; material inspection reports can be provided. |
Single Piece Weight |
50kg-10000kg |
Covers production range from small and medium to extra-large castings. |
Dimensional Accuracy |
CT8-CT12 (casting tolerance) |
Reserved machining allowance ≥5mm at key locations. |
Surface Roughness |
Ra=50-125μm (as-cast condition) |
After machining, can reach Ra=1.6-6.3μm. |
Mechanical Properties |
Tensile strength ≥250MPa (HT250), yield strength ≥200MPa (QT400-15), hardness HB180-260. |
Tested according to GB/T 9439 and GB/T 1348 standards. |
Metallographic Structure |
Pearlite + ferrite (cast iron) |
Balanced properties obtained after solution and aging treatment. |
Process Flow
Material selection → melting (medium frequency furnace) → sand mold making (resin sand/sodium silicate sand) → pouring → sand removal → natural aging (≥6 months) → flaw detection (MT/UT) → rough machining → finish machining (according to customer requirements).
Quality Control
1. Raw material testing: Spectral analysis for composition control, element errors for C, Si, Mn ≤0.1%.
2. Non-destructive testing: 100% magnetic particle inspection (MT), ultrasonic testing (UT) at key locations, qualified level II or above.
3. Geometric inspection: Coordinate measuring machine (CMM) inspection of key dimensions, geometric tolerances conforming to GB/T 1182 standard.
Archway casting products, with reliable performance and flexible customization capabilities, have become indispensable core foundational components in the high-end equipment manufacturing field, significantly enhancing the reliability and service life of entire machines.
Keywords
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Archway Casting
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