CNC metal materials suitable for machine tool structural parts, equipment bases, housings, pump and valve housings, bearing seats, guide rails, wear-resistant seats, shock-absorbing structural parts, and ordinary mechanical castings.
Cast Iron is an iron-carbon alloy material processed through CNC turning, milling, drilling, boring, grinding, and other methods. Common types include gray Cast Iron, ductile Cast Iron, and malleable Cast Iron. Cast Iron has good shock absorption, wear resistance, machinability, and dimensional stability, and is commonly used in machine tool bases, equipment bases, housings, pump bodies, valve bodies, bearing seats, guide rails, pulleys, and ordinary mechanical structural components. Compared to ordinary carbon steel, Cast Iron better shock absorption and machinability; Compared to steel, Cast Iron toughness and impact resistance are generally weaker.
By focusing on application scenarios, boundaries of advantages, and non-recommended scenarios, it helps sales, customer service, and quoting staff quickly determine whether the material meets current part requirements.
It has good shock absorption performance, good wear resistance, good machinability, good dimensional stability, relatively controllable cost, suitable for large structural parts, housing and base parts, suitable for withstanding compressive loads, and can produce good flat surfaces and hole positional accuracy.
Machine tool bases, equipment bases, mechanical housings, pump bodies, valve bodies, bearing seats, guide rails, slides, pulleys, flywheels, flange seats, support seats, pressure plates, counterweight blocks, fixture bases, Cast Iron platforms, mechanical housings, wear-resistant seat bodies, and general industrial equipment structural parts.
High-impact parts, high-toughness structural parts, high-strength tensile parts, high-elasticity snap-fit parts, thin-walled complex-appearance parts, long-term strongly corrosive environment parts, food direct contact parts, medical implant parts, high-precision, high-speed lightweight parts, structural parts requiring welded strength, and parts requiring rust-free maintenance.
The following parameters come from product information and material knowledge fields, used for design review, quotation communication, and preliminary judgment before material selection.
| Material positioning | CNC metal materials suitable for machine tool structural parts, equipment bases, housings, pump and valve housings, bearing seats, guide rails, wear-resistant seats, shock-absorbing structural parts, and ordinary mechanical castings. |
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| Precision performance | CNC Cast Iron can achieve good machining accuracy, suitable for machining flat surfaces, hole positions, bearing seats, guide rail surfaces, and housing mating surfaces. Due to Cast Iron machinability, stable structures can achieve good dimensions and surface quality. Actual accuracy is affected by internal stress in the casting, casting defects, clamping method, machining allowance, aging treatment, and part dimensions. High-precision guide rail surfaces, mounting surfaces, and bearing holes are recommended for grinding, boring, or scraping. |
| Dimensional tolerances | Conventional dimensional tolerances for CNC machining Cast Iron can be referenced ± 0.03mm to ±0.10mm, while ordinary structural parts can be evaluated at ± 0.10mm to ±0.30mm. Large castings, housings, bases, and guide rail parts may need to be evaluated separately based on casting condition, machining allowance, and aging treatment. These values are standard reference ranges and do not guarantee absolute tolerances for all structures. Key hole positions, guide rail surfaces, mounting surfaces, and flatness should be separately marked with tolerance requirements. |
| Minimum Wall Thickness | The wall thickness of ordinary Cast Iron CNC fabricated structures is recommended to be no less than 3.0mm-5.0mm. Castings are not suitable for designs with overly thin walls, as thin-wall areas are prone to under-pouring, shrinkage cavities, deformation, cracking, or chipped edges during processing. The load positions, threaded holes, bearing housings, guide rails, and mounting surfaces should be appropriately thickened to ensure casting quality and machining allowance. |
| Recommended wall thickness | For ordinary small Cast Iron structural components, wall thickness is recommended to be above 5.0mm; for housings, bases, support seats, and bearing seats, it is recommended to design 8.0mm to 20.0mm or higher based on size and load; for large equipment bases and machine tool structural parts, rigidity should be enhanced through rib plates, reinforcing ribs, and reasonable wall thickness distribution, avoiding local overthinning or sudden thickness changes. |
| Minimum aperture | CNC drilling can achieve smaller hole diameters, but Cast Iron small and deep holes, factors such as chip evacuation, Graphite dust, tool wear, and hole wall quality must be considered. For general designs, the recommended aperture is no less than 2.0mm. Threaded holes, positioning holes, bearing holes, and oil holes should ensure sufficient hole margins and machining allowances. For important holes, it is recommended to use drilling, boring, reaming, or finishing to ensure size and coaxiality. |
| Assembly clearance | For ordinary metal assemblies, it is recommended to reserve 0.05mm-0.20mm on one side; for large Cast Iron structural parts, housings, and bases, it is recommended to reserve 0.10mm-0.50mm depending on machining accuracy, positioning method, and paint thickness. Tolerances for bearing holes, positioning pin holes, guide rail sliding surfaces, and machine tool assembly surfaces should be defined separately according to the fit grade. Painted surfaces and unprocessed surfaces should not be used as high-precision positioning surfaces. |
| Detailed performance | Cast Iron suitable for machining holes, grooves, steps, chamfers, threads, oil grooves, mounting surfaces, guide rail surfaces, bearing holes, and housing structural details. CNC machining details are clear, but the surface details of the cast blank are usually rougher. Extremely small sharp corners, thin walls, slender columns, and tiny text are not suitable for Cast Iron design. Logos and markings are recommended to be achieved through casting raised letters, CNC engraving, laser marking, nameplates, or sprayed markings. |
| Surface effect | Cast Iron original casting surface is usually gray-black or dark gray, with a rougher surface, possibly showing sand patterns, scale oxide, and casting textures. The CNC machined surface usually appears gray-silver or dark gray metallic surfaces, with fine machining patterns visible. After sandblasting or shot blasting, a uniform matte gray surface is obtained, and after painting or powder spraying, better protection and appearance are achieved. Cast Iron is usually made of functional materials and does not focus on high-gloss decorative appearances. |
Based on material characteristics and suitable product ranges, customer needs are broken down into easier application directions to determine.
Machine tool bases, equipment bases, mechanical housings, pump bodies, valve bodies, bearing seats, guide rails, slides, pulleys, flywheels, flange seats, support seats, pressure plates, counterweight blocks, fixture bases, Cast Iron platforms, mechanical housings, wear-resistant seat bodies, and general industrial equipment structural parts.
CNC metal materials suitable for machine tool structural parts, equipment bases, housings, pump and valve housings, bearing seats, guide rails, wear-resistant seats, shock-absorbing structural parts, and ordinary mechanical castings.
The main features of Cast Iron are good shock absorption, good wear resistance, and good machinability, making it suitable for manufacturing bases, housings, guide rails, and support parts in mechanical equipment. Gray Cast Iron is more suitable for shock absorption, wear resistance, and ordinary machined structures; Ductile ink Cast Iron has better strength and toughness, making it more suitable for structural components that can withstand higher loads. Cast Iron has better compressive strength, but its tensile, impact, and weldability are generally inferior to steel. Design should avoid sharp corners, thin walls, and severe impact loads.
Based on wall thickness, hole position, assembly clearance, dimensional tolerances, and material usage risks, determine in advance whether the part structure is suitable for Cast Iron.
Post-processing of Cast Iron affects appearance, dimensions, hole position, assembly clearance, and usage validation results, and should be explained in advance during quotation, DFM review, and sample confirmation stages.
Post-processing should focus on appearance display, dimensional fitting, connection assembly, and testing verification. Parts involving assembly positions need to be reserved in advance for machining, coating, and trial assembly allowances.
For common issues such as threads, snaps, strength, temperature resistance, and weather resistance, identify in advance whether the material needs to be replaced or if another processing method should be used.
When customer demand exceeds Cast Iron material boundaries, it is necessary to combine strength, temperature resistance, toughness, long-term stability, and mass production goals to promptly recommend alternative materials or processing technologies.
If higher toughness and impact resistance are required, carbon steel, Q235, Q345, 45# steel, or 40Cr can be chosen; If higher strength and better overall mechanical properties are required, ductile Cast Iron, alloy steel, or quenched and tempered steel can be chosen; If better corrosion resistance is required, 304 stainless steel, 316 stainless steel, or surface protection Cast Iron can be chosen; If lightweight design is needed,6061 Aluminum Alloy, 7075, or aluminum alloy castings can be chosen; If high-precision wear-resistant guide rails are needed, Cast Iron can be selected and then ground and treated with grinding, quenching, or surface treatment.
If customers require materials that are shock-absorbing, wear-resistant, cost-controllable, and suitable for large-scale mechanical structures, CNC Cast Iron is the right choice, especially for machine tool bases, equipment bases, housings, and guide rail parts. If customers require high impact toughness, high tensile strength, lightweight or welded structures, it is not recommended to prioritize ordinary Cast Iron; materials such as steel, aluminum alloy, or ductile Cast Iron should be considered. When selecting materials, it should first be clear whether it is gray Cast Iron, ductilized ink Cast Iron or another Cast Iron grade.
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