Applications of Self-lubricating Bearings in Punch Press Equipment

"We replaced three sets of connecting rod bearings last month. Each replacement led to 4 hours of production downtime and a loss of 200,000 punched parts!"
"The guide rail brass bushings require greasing every three days, and the grease that leaks into the dies results in a 37% scrap rate of parts..."

These real complaints from a manager of an auto parts stamping factory expose the common bearing dilemmas in traditional punch presses. With 300 impacts per minute, phenomena such as grease being flung off, brass bushings being crushed, and roller elements shattering have become the norm. However, graphite-inlaid self-lubricating bearings (brass bushings/plates) are offering a groundbreaking solution:

Oil-free Self-lubrication: Graphite releases a lubricating film upon impact, enabling lifetime maintenance-free operation.

Impact Absorption: The copper matrix absorbs 80% of the vibration energy, extending the service life by 5-8 times.

Elimination of Hidden Costs: Reduces losses from production downtime, scrap parts, and oil leakage, leading to an annual comprehensive cost reduction of over 40%.

As a self-lubricating bearing solution provider serving dozens of manufacturing enterprises, Mingxu Machinery explains how graphite brass bushings/plates can make punch presses "more efficient and worry-free with every punch."

I. Crankshaft Suppor

II. t Bearings: The Terminator of Millions of Impacts

Pain Points:

200-ton punching force → 2 sets of needle roller bearings fracture monthly → Each replacement requires 8 hours of machine disassembly.

Solution:

Multi-layer composite brass bushing: Steel backing reinforcement layer + copper-based sintered body + 30% graphite inlay.

Anti-fatigue design: Pre-stress treatment (residual compressive stress ≥ 200 MPa).

Actual Effects:

Case Study: On the motor housing stamping line of Gree Electric, annual downtime losses were reduced by RMB 3.2 million.

II. Connecting Rod Hinge Bushings: The Noise Suppressor for Vibration and Rattling

Harsh Working Conditions:

300 reciprocating impacts per minute + lateral offset forces.

Technological Breakthroughs:

Directed Graphite Arrangement: Gradient densification along the force direction (30% on the surface layer → 15% in the inner layer).

Self-compensating Structure: Spherical brass bushings adapt to ±1.5° angular deviations.

Data Comparison:

Benefits: At a brake pad stamping factory, annual scrap losses were reduced by RMB 1.8 million.

III. Guide Rail Wear Plates: The Precision Guardian

Pain Points:

Slider vibration causes guide rail wear → Punching precision deteriorates from ±0.1mm to ±0.8mm.

Innovative Solution:

Sandwich Copper Plate: Stainless steel base plate + copper-based graphite layer + PTFE surface film.

Micro-oil Groove Design: Laser-engraved grease-storage micro-pits (Φ0.3mm × depth 0.1mm).

Actual Test Data:

Case Study: On the relay stamping press of Bosch, 20 million punching operations were achieved with zero precision compensation.