Aluminum alloy nuts, chemical nuts, and precision hardware parts' CNC turning services

Application and Characteristics of Aluminum Alloy Positioning Bushes in Chemical Equipment Hardware

I. Core Application Scenarios

1. Pumps and Valves (Most Widely Used)

• Positioning of pump bodies and covers for centrifugal pumps, magnetic pumps and chemical pumps, ensuring coaxiality and reducing vibration and wear.
• Stem guiding bushes for globe valves, ball valves, butterfly valves and control valves, reducing friction and improving switching accuracy and sealing.
• Sealing components: positioning support for stuffing boxes and mechanical seals, adapting to acid-base and solvent conditions.

2. Reactors and Pressure Vessels

• Stirring shaft positioning: guiding for stirring shafts in reactors and autoclaves, ensuring concentricity and reducing swing.
• Manhole/quick-opening structures: positioning and sealing of flanges, combining strength and corrosion resistance.

3. Piping and Fluid Transportation Systems

• Pipe supports and clamps: lightweight and corrosion-resistant positioning for corrosive medium pipelines.
• Expansion joints: bushes provide guidance and positioning to absorb thermal expansion and contraction.

4. Filtration and Separation Equipment

• Centrifuges and filter presses: positioning bushes for drums, filter plates and spindles.
• Membrane separation and ion exchange: component positioning and sealing for acid-base and organic solvent environments.

5. Instruments and Actuators

• Flow meters, level meters and control valves: positioning and guidance for sensors and actuators.
• Pneumatic/electric actuators: connecting rods and shaft bushes with low friction and long service life.

II. Core Characteristics and Advantages

1. Material and Corrosion Resistance

• Natural corrosion resistance: dense Al₂O₃ oxide film formed on the surface, resistant to atmosphere, fresh water, weak acids and alkalis.
• Surface strengthening: anodizing, hard anodizing, PTFE/fluorocarbon coating improve corrosion and wear resistance.
• Medium compatibility: stable to neutral/weak acid-base, alcohols, ketones and partial salt solutions.

2. Light Weight and Mechanical Properties

• Low density (≈2.7 g/cm³): only 1/3 of steel, significantly reducing equipment weight.
• Moderate strength: 6061/7075/2A12 aluminum alloys have tensile strength of 200–500 MPa after heat treatment.
• Good rigidity and toughness: resistant to impact and not easy to crack.

3. Friction and Wear Resistance

• Low friction coefficient: self-lubricating coatings (PTFE, graphite) enable oil-free/low-oil lubrication.
• Controllable wear resistance: hard anodizing (HV 300–600) enhances wear resistance.

4. Machinability and Precision

• Easy to machine: suitable for turning, milling, drilling, CNC and extrusion.
• High precision: dimensional accuracy up to IT6–IT7, coaxiality ≤0.005 mm.
• Good interchangeability: easy installation and replacement.

5. Thermal and Electrical Properties

• High thermal conductivity: beneficial for heat dissipation.
• Non-magnetic: suitable for instruments and electromagnetic-sensitive equipment.
• Insulation: oxide film/coating prevents electrochemical corrosion and leakage.

6. Cost and Environmental Protection

• Cost-effective: lower raw material and processing costs than stainless steel, copper alloy and titanium alloy.
• Recyclable: 100% recyclable, meeting environmental requirements.

III. Selection and Application Guidelines

1. Material Selection

• 6061-T6: general-purpose, good corrosion resistance, easy machining, for medium-light load.
• 7075-T6: high strength, for heavy load, vibration and impact conditions.
• 2A12 (LY12): high strength and heat resistance, for medium-high temperature.
• 5052/5083: high corrosion resistance, for strong corrosion environments.

2. Surface Treatment

• Anodizing: basic protection, corrosion and wear resistance.
• Hard anodizing: for high wear and strong corrosion conditions.
• PTFE/graphite coating: self-lubricating, low friction, anti-adhesion.
• Fluorocarbon/ceramic coating: ultra-high corrosion resistance.

3. Fit and Installation

• Clearance fit: H7/g6, H7/h6 to ensure positioning accuracy.
• Axial positioning: steps, snap rings and retaining rings.
• Prevent dissimilar metal contact: avoid galvanic corrosion.

4. Working Conditions Limits

• Temperature: generally -50℃～150℃; hard anodizing up to 250℃.
• Load: mainly medium-light load; heavy load uses steel-backed aluminum bushes.
• Medium: avoid strong oxidizing acids, concentrated strong alkalis and halogens.

IV. Comparison with Other Materials

V. Summary

We have introduced advanced equipment and technology from Japan and Germany (CNC 5-axis and 6-axis machines) to better serve our customers' needs.

Our maximum processing outer diameter is 60, and the minimum control tolerance is 0.001. We have Japanese CNC Tsugami, CNC Citizen, multi-station cold extrusion forming machines, 500T press machines, casting equipment, and various process equipment, which can effectively provide customers with the best technical solutions.

Our company has a total of 300 employees, including 20 technicians, 10 engineers, and 15 quality control personnel. We have over 300 pieces of equipment.

Our company implements 8S management and has passed ISO9001 and TS16949 automotive certifications.

Our customers include Siemens, bo-sch, Foxconn, Panasonic Motors, Husqvarna, Shimano, NVIDIA, DJI Drones, Siegenia, and Cater-pillar.