Overhead Crane Solutions for Bearing Manufacturing
Bearing manufacturing (ring forgings 5–50 kg/pc, rolling elements — balls/rollers, pressed cages, final assembly) is precision machining. Recommended: LD single-girder electric crane 3–5 t with lifting magnet + KBK 500 kg + jib crane. Kelude's bearing solution is engineered for scratch-free handling across the board.
Bearing manufacturing — covering deep-groove ball, tapered, cylindrical, and spherical roller types — revolves around four core processes: ring forging/turning/grinding, rolling element production, cage stamping, and final assembly. This article provides a targeted crane configuration for each stage.
Ring Forging, Turning & Grinding — Handling Forgings and Semi-Finished Parts
Bearing rings move through forging, turning, heat treatment, and grinding, with multiple inter-stage transfers in between. Individual ring forgings weigh 5–50 kg (small bearings with 30 mm OD weigh about 5 g; large bearings with 2 m OD can reach 500 kg). Ground semi-finished rings have a surface roughness of Ra ≤ 0.2 μm — any impact or scratch means scrapping the part.
Recommended model: LD single-girder electric overhead crane, 3–5 t capacity with a 10–15 m span, fitted with a lifting magnet (adjustable holding force to suit different ring wall thicknesses). The magnet face is lined with a 3 mm polyurethane pad to prevent surface damage. In the grinding area, use nylon slings with plastic pallets.
Price reference: LD single-girder crane, 3 t / 12 m span: approx. $4,500–$8,900 per unit. Lifting magnet: approx. $1,200–$2,200 per set. Kelude's ring-handling package includes polyurethane-faced lifting magnets and scratch-resistant pallets.
Rolling Element Production — Heat Treatment and Grinding of Balls and Rollers
Steel balls (Ø1–50 mm) and rollers (Ø5–80 mm, 10–200 mm long) go through cold heading, heat treatment, grinding, and sorting. These rolling elements are handled in bulk — 500 to 5,000 kg per batch — so they call for lifting and conveying equipment rather than conventional overhead cranes.
Recommended model: A bucket elevator (500 kg/h capacity, 3–5 m lifting height) feeds the heat-treatment furnace. A screw conveyor then moves the ground balls to the sorting machine. At the grinding station, a 250 kg electric hoist handles grinding plates weighing 100–300 kg.
Price reference: A 250 kg electric hoist runs approximately $450–$900 per unit. Kelude's rolling-element package integrates the bucket elevator, screw conveyor, and hopper in a coordinated system.
Cage Stamping: Die Changes and Coil Handling
Bearing cages (stamped from steel plate, copper plate, or nylon) are produced on multi-station progressive dies fed by coil stock (500–2,000 kg per coil). Dies weighing 200–1,000 kg are changed 1–3 times per week, while coil changes occur every 2–4 hours.
Recommended model: A 500 kg KBK flexible modular crane covers coil loading and die changes across the stamping area. A 250 kg jib crane assists with coil reel operation, and a die rack (2 t per shelf) stores dies, retrieved via the KBK system.
Price reference: A 500 kg KBK system costs roughly $3,000–$6,000 per unit. Kelude's cage-stamping package includes hydraulic die clamps and a rapid positioning system.
Final Assembly: Precision Fitting and Inspection
Bearing final assembly — mating inner rings, outer rings, rolling elements, and cages — takes place in a Class 10,000 cleanroom. Large bearings (outer diameter ≥ 500 mm) require scratch-free handling, as mating surfaces hold a roughness of Ra ≤ 0.1 μm. Finished-part inspection covers clearance measurement (0.001 mm accuracy) and vibration testing.
Recommended model: A BZD jib crane (250–500 kg, 2 m slewing radius) handles large bearings in the assembly area, using nylon lifting slings with polyurethane padding. In the precision inspection zone, a 50 kg pneumatic balancer assists in tilting large bearings on the test stand.
Price reference: A 250 kg jib crane is priced at about $1,200–$2,200 per unit. Kelude's bearing assembly package includes a stainless steel cantilever crane purpose-built for cleanroom use.
Bearing Manufacturing Crane Configuration Comparison
| Process | recommended model | tonnage | Protectionrequirements | reference price |
|---|---|---|---|---|
| Ring | LD+Lifting magnet | 3~5t | Polyurethane Lining | 3~710,000 |
| Rolling Element | Hoist+Screw Conveying | 250kg | Bulk Material Handling | 0.3~410,000 |
| Cage | KBK+jib crane | 0.5t | Coil≤2t/Reel | 2~410,000 |
| Final Assembly | jib crane+Pneumaticdynamic balancing | 0.25~0.5t | Ra≤0.1μm/Clean | 0.8~1.510,000 |
Key Parameters for Bearing Manufacturing
Kelude Service Advantages for Bearing Manufacturing
Kelude Heavy Industry has extensive experience in the bearing manufacturing sector, backed by a 50,000 m² production facility and an ISO 9001 Quality Management System. We deliver precision anti-damage crane solutions tailored to the four key processes: rings, rolling elements, cages, and final assembly.
Precision Anti-Damage Handling
Our core approach combines LD lifting magnets with nylon slings and polyurethane-coated contact surfaces, providing full-process protection against damage across ring, rolling element, cage, and final assembly operations.
Multi-Process Adaptability
Standard equipment includes polyurethane-faced lifting magnets with adjustable holding force, anti-damage nylon slings, and stainless steel jib cranes for cleanroom areas — all matched to the accuracy requirements of each specific process.
Process Flow Planning
We provide complete bearing workshop layout planning — covering crane type and tonnage for each process, coil and forging transport routes, and cleanroom zoning — to minimize handling-related damage risks.
FAQ
Q: How do you prevent damage to ground rings during handling?
A: Ground rings (Ra≤0.2μm) are extremely sensitive. Recommended handling practices: ① Use lifting magnets with a polyurethane pad (3 mm thick, Shore A60 hardness) bonded to the working face, and reduce the holding force to 1.5 times the load weight; ② Never contact the finished surface with the magnet — only lift by non-machined areas (end faces or outer diameter); ③ For small batches (≤100 pieces), use plastic pallets with separators and transport the entire pallet. Kelude's ring handling solutions include polyurethane-faced magnets with adjustable force regulators.
Q: What equipment is used for loading steel balls and rollers into heat treatment furnaces?
A: Heat treatment furnace loading involves bulk materials, where traditional forklift trucks are inefficient. Recommended options: ① Bucket elevators (500~1000 kg/h capacity) — steel balls drop from the hopper into the elevator buckets and are discharged onto the furnace feed tray; ② Screw conveyors — ideal for rollers (better guidance), with throughput of 300~800 kg/h; ③ Vibratory hoppers — prevent bridging of steel balls in the storage hopper. Kelude provides integrated heat treatment loading systems.
Q: What is the die change frequency for cage stamping presses, and how does crane support work?
A: Die cage progressive dies (500–1000 kg) are typically replaced every 1–2 weeks (when changing product models) and re-ground every 3–6 months. Replacement procedure: ① The KBK hoist lifts the new die from the die rack and positions it beside the press; ② The old die is released with hydraulic clamps and removed via KBK; ③ The new die is lowered into place and secured by hydraulic clamps (positioning accuracy ≤ 0.01 mm). Total changeover time: approximately 30–60 minutes. Kelude Heavy Industry offers a hydraulic quick-change system that reduces die changeover to ≤ 20 minutes.
Q: How is cleanliness maintained in the large bearing final assembly workshop?
A: Final assembly of large bearings (outer diameter ≥ 500 mm) requires Class 10,000 cleanroom conditions (ISO Class 7). Measures include: ① Personnel — cleanroom coveralls, hairnets, and masks are required, with air shower decontamination; ② Materials — bearing components are cleaned, dried, and UV-sterilized before entering the cleanroom; ③ Equipment — the cantilever jib crane used in final assembly is made of stainless steel with dust-free lubrication to prevent particle generation; ④ Air pressure — the cleanroom is maintained under positive pressure (pressure differential ≥ 5 Pa relative to adjacent areas). Kelude Heavy Industry provides an integrated solution combining cleanroom-rated jib cranes with positive-pressure air supply.
