Product Description
A Hard Chrome Plated Piston Rod is a hydraulic system component that undergoes special surface treatment, featuring a hard chrome plating on its surface. Commonly used in hydraulic cylinders, it is typically made of high-strength steel, with a chrome plating thickness of approximately 0.0005 to 0.0015 inches, offering excellent wear resistance, corrosion resistance, and high strength.
Manufacturing Process
1. Material Preparation: Select high-quality steel (CK45, alloy steel) and verify its quality through chemical analysis and mechanical performance testing.
2. Heat Treatment: Perform normalizing, stress relieving, or quenching and tempering treatments to enhance the internal properties of the material.
3. Precision Machining: Utilize CNC turning, centerless grinding, and other processes to meet pre-plating dimensional requirements.
4. Induction Hardening (applicable to hardened products): High-frequency heating to achieve the required hardening depth and surface hardness.
5. Hard Chrome Plating: Electroplate a 20-50 micron chrome layer to improve wear resistance and corrosion resistance.
6. Final Finishing: Precision grinding and polishing to achieve final tolerances (ISO f7) and surface roughness (Ra ≤0.2 μm) requirements.
7. Quality Control: Comprehensive inspection, including dimensional inspection, roughness testing, chrome plating thickness measurement, and straightness verification.
Advantages
A hard chrome plated piston rod is coated with a layer of hard chrome via electroplating, with the chrome layer typically 0.0005–0.0015 inches thick. Its advantages include:
1. Corrosion Resistance: The hard chrome plating creates a tough, durable surface that resists corrosion and wear.
2. Increased Durability: The chrome layer enhances wear resistance, extending the piston rod's service life.
3. Improved Performance: The smooth chrome-plated surface reduces friction, boosting cylinder performance.
4. Reduced Maintenance: Compared to uncoated piston rods, hard chrome plated ones require less maintenance and are easier to clean.
5. Enhanced Aesthetics: The shiny, reflective chrome surface improves the hydraulic cylinder's visual appeal.
Main Application Areas
1. Injection molding machines: Clamping cylinders and injection cylinders, requiring extremely high surface quality to prevent contamination of plastic products.
2. Construction machinery: Hydraulic cylinders for excavators and loaders, facing extreme impact and harsh outdoor environments.
3. Metallurgical equipment: Pressing cylinders for continuous casting machines and rolling mills, subject to high temperature and heavy loads.
4. Automotive manufacturing: Main cylinders of presses on stamping production lines.
5. Marine machinery: Steering gear and deck crane cylinders, requiring strong resistance to salt spray corrosion.
6. Papermaking machinery: Requiring high corrosion resistance and a smooth surface.
Key Selection Points
1. Coating thickness: Specify according to the working environment and wear resistance requirements.
2. Surface roughness: Specify according to sealing requirements (usually Ra 0.2 - 0.4 μm).
3. Hardness value: Confirm that the surface hardness meets the standards.
4. Base material and strength: Select according to the load-bearing capacity.
5. Straightness and dimensional tolerance: Ensure proper fit with the cylinder barrel and seals.
6. Non-destructive testing report: Ensure there are no internal cracks or coating defects.
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