Fixed Base

Fixed Base for Machinery — Technical Specification

1. General Information

Industry Sector:

Machinery Manufacturing

Component Name:

Fixed Base

Manufacturing Process:

CNC Metal Spinning + Hot-Dip Galvanizing

Base Material:
Q235B Carbon Structural Steel, compliant with GB/T 700-2006

Mechanical Properties:

• Yield Strength: ≥235 MPa
• Tensile Strength: 370–500 MPa
• Elongation: ≥26%
• Density: 7.85 g/cm³
• Melting Range: 1450–1500 °C

2. Dimensional & Surface Specifications

Nominal Wall Thickness: 1.5 mm

Thickness Tolerance: ±0.1 mm

Overall Dimensions: Ø500 mm × H120 mm

Geometrical Tolerances (GB/T 1804-2000, Grade m):

• Roundness: ≤0.3 mm
• Perpendicularity: ≤0.2 mm/m

Surface Finish:

• After galvanizing: Ra ≤1.6 μm

3. Surface Treatment

Coating Method: Hot-Dip Galvanizing

Standard: GB/T 13912-2020

Coating Performance Requirements:

• Zinc Layer Thickness: ≥85 μm
• Adhesion: ≥Class 1 (Cross-cut test)
• Corrosion Resistance: ≥96 h Neutral Salt Spray (NSS), no red rust

A post-galvanizing chromate passivation treatment is applied to further enhance corrosion resistance and coating stability.

4. Manufacturing Process Description

4.1 CNC Metal Spinning Forming

The fixed base is formed using precision CNC metal spinning, ensuring high concentricity, uniform wall thickness, and controlled material flow.

Equipment:

• CNC Metal Spinning Lathe (KMS-800 series)

Typical Process Parameters:

• Spindle Speed: 600–1000 rpm
• Roller Feed Rate: 4–8 mm
• Single-Pass Thickness Reduction: 0.3–0.5 mm
• Total Forming Reduction: 1.4–1.6 mm

This controlled deformation strategy ensures wall thickness consistency and minimizes residual stress.

4.2 Raw Material Pretreatment

Q235B steel sheets undergo a standardized pretreatment sequence:

• Alkaline degreasing
• Acid pickling for oxide and rust removal
• Water rinsing and neutralization
• Thermal drying
• Precision leveling (flatness ≤0.2 mm/m)

This process guarantees clean surfaces, uniform grain structure, and defect-free material prior to forming.

4.3 CNC Finishing Operations

• CAD/CAM-based toolpath programming
• Real-time dimensional monitoring during spinning (sampling rate: 12 Hz)
• CNC milling of mounting and interface surfaces

Machining Accuracy:

• End-face perpendicularity: ≤0.1 mm/m
• Mounting surface flatness: ≤0.15 mm/m

4.4 Post-Processing

• Mechanical deburring (1500# abrasive)
• Compressed-air cleaning
• Hot-dip galvanizing
• Chromate passivation
• Final dimensional and visual inspection

5. Quality Assurance & Inspection

5.1 Quality System

Manufactured under:

• ISO 9001:2015
• GB/T 700-2006 (Carbon Structural Steel)
• GB/T 13912-2020 (Galvanized Coatings)

5.2 Inspection Regime

Raw Material Inspection:

• Chemical composition by spectrometry
• Mechanical property testing
• Ultrasonic testing for internal defects

In-Process & Final Inspection:

1. Forming profile verification (≥98% template conformity)
2. Full-circumference wall thickness inspection (UT, ±0.01 mm)
3. Dimensional verification by CMM (±0.005 mm)
4. Pre-galvanizing surface condition assessment
5. Zinc coating thickness and adhesion testing
6. Salt spray corrosion testing (sample-based)
7. Edge condition and chamfer inspection (R ≥1.5 mm)
8. Internal integrity verification by X-ray testing (RT, JB/T 4730.2 Level II)

Final Acceptance:
Sampling per GB/T 2828.1-2012, AQL 2.5
Each unit is supplied with full traceability documentation.

6. Production Capacity & Logistics

Equipment Configuration:

• CNC Metal Spinning Machines: 5 units
• Hot-Dip Galvanizing Lines: 2
• CNC Milling Machines: 3

Production Output:

• Approx. 80 pcs/day per line (two-shift operation)
• Maximum monthly capacity: 4,800 pcs

Lead Time:

• Small batches (10–50 pcs): 6–8 working days
• Large batches (≥100 pcs): 10–15 working days
• Expedited orders: 3–5 working days (subject to capacity confirmation)

7. Application Scope

Primary Applications

Used as a protective fixed base cover for:

• Electric motors
• Gear reducers
• Pumps
• Automation and machinery frames

Functions include bottom protection, dust and moisture shielding, positioning support, and auxiliary vibration damping.

Operating Conditions:

• Temperature range: –20 °C to 120 °C
• Load-bearing pressure: ≤2.0 MPa
• Suitable for indoor industrial and limited outdoor environments

8. Extended Applications

Applicable to:

• New energy equipment bases (energy storage, PV systems)
• Automated warehousing systems
• Heavy machinery auxiliary supports
• Agricultural machinery chassis
• Rail transit equipment foundations

The galvanized structure ensures durability under humid, dusty, and mechanically demanding conditions.

9. After-Sales & Technical Support

Warranty Period: 24 months from acceptance

Support Scope:

1. Technical consultation and selection guidance
2. Installation documentation and inspection reports
3. Remote or on-site technical support for bulk projects

Post-Warranty Services:

1. Re-galvanizing, dimensional correction, structural modification
2. Long-term maintenance and inspection agreements

Contact us and Request A Quote