【Zhejiang, China】 In the precise manufacturing process of a crankshaft, there is a process that, while not directly determining dimensional accuracy, profoundly impacts the crankshaft's lifespan and reliability-shot peening. This seemingly simple "sandblasting" process is actually forging an invisible "fatigue-resistant armor" on the crankshaft surface. Recently, the technical team of Zhejiang Weilin Mechanical Co., Ltd. conducted an in-depth on-site shooting of the shot peening process for a KOMATSU S6D170 5 crankshaft (example part number: 6245 31 1100) in the workshop, capturing this critical strengthening the process through the lens.
Shot Peening: Injecting "Fatigue-Resistant Genes" into the Crankshaft
In heavy construction machinery and mining equipment, the crankshaft withstands extremely complex alternating loads. The initiation of fatigue cracks often begins at tiny stress concentration points on the surface. The shot peening process is precisely the ultimate solution to this problem:
· Principle Revealed: The shot peening machine propels countless tiny steel or ceramic shots at high speed (up to tens of meters per second) onto the crankshaft surface. Each impact acts as a microscopic "hammer blow," causing minute plastic deformation on the metal surface and forming a residual compressive stress layer.
· Fatigue Resistance Code: The beauty of this compressive stress layer is that when the crankshaft experiences alternating loads, the surface residual compressive stress counteracts a portion of the external tensile stress, thereby significantly delaying the initiation and propagation of fatigue cracks.
Research data shows that shot-peened crankshafts can have their fatigue life increased several times over.
· Surface Cleaning: Beyond strengthening, shot peening thoroughly removes scale, burrs, and minute attachment from the crankshaft surface, creating clean surface conditions for subsequent precision machining or final inspection.
On-Site Shooting: A "Storm of Steel Shots" Under the Lens
Recently, at Zhejiang Weilin Mechanical's production workshop, the technical team conducted a comprehensive shooting session of the shot peening process for a KOMATSU S6D170 5 crankshaft (corresponding to part number 6245 31 1100). Through high-definition lenses, we can clearly observe:
· Enclosed Shot Peening Machine: The crankshaft is fed into a fully enclosed shot peening chamber equipped with multiple high-speed rotating impellers. Through the observation window, countless steel shots can be seen raining down on the crankshaft surface in a intensive storm, producing a continuous, uniform "shushing" sound-a scene of immense industrial impact.
· Multi-Angle Coverage: Our shot peening equipment features multiple adjustable-angle impellers, ensuring every corner of the crankshaft-from main journals to crankpins, from crank webs to fillet transition areas-receives uniform strengthening.
· Precise Process Parameter Control: Key parameters such as shot velocity, flow rate, and duration are displayed in real-time on the control panel. Technicians precisely set process parameters based on the crankshaft's material, size, and intended application, ensuring consistent strengthening the effect.
In the video, after shot peening, the KOMATSU S6D170 5 crankshaft exhibits a uniform, fine matte finish on its surface. Technicians use surface roughness testers and residual stress detector for sampling inspections to verify that the strengthening the effect meets design requirements.
Technical Value: Strengthening from "Surface" to "Essence"
Shot peening may appear simple, but it contains profound engineering wisdom. In shot peening the KOMATSU S6D170 5 crankshaft, Zhejiang Weilin Mechanical employs:
· High-Precision Shot Peening Equipment: Equipped with imported impellers and precise control systems to ensure precise control of shot flow rate, velocity, and angle.
· Multi-Media Process: Depending on material and strengthening requirements, different media (cast steel shots, ceramic shots, stainless steel shots) and shot sizes are selected to achieve customized strengthening effects.
· Process Monitoring and Validation: Real-time monitoring of shot peening intensity (Almen strip testing) and regular sampling for residual stress testing ensure every crankshaft receives a stable, uniform strengthened layer.
· Cleanliness Assurance: Post-shot peening, high-pressure air and specialized cleaning equipment thoroughly remove residual shot fragments from the surface, avoiding secondary contamination.
Customer Value: Longer Life, Lower Costs
For end users in mining, construction machinery, and similar sectors, the value delivered by shot peening is far greater than imagined:
· Extended Overhaul Intervals: Shot-peened crankshafts have significantly improved fatigue life, meaning engine overhaul cycles can be substantially extended, directly reducing annualized maintenance costs.
· Reduced Unexpected Failure Risk: The residual compressive stress layer effectively inhibits fatigue crack initiation, significantly lowering the risk of catastrophic equipment failure due to crankshaft fracture.
· Improved Equipment Availability: A more reliable crankshaft means fewer unplanned outages, ensuring production efficiency in continuous operation scenarios like mines and construction sites.
DIFFERENCE
DIFFERENCE
Video & Image Access: Feel Free to Contact Us
To more intuitively demonstrate the shock spectacle of the shot peening process, we have compiled high-definition videos and images from the on-siteshooting into a technical information package. If you are interested in the manufacturing process of the KOMATSU S6D170 5 crankshaft or wish to obtain technical parameters related to 6245 31 1100, please feel free to contact our technical team anytime. We will provide you with detailed technical support and product solutions.
About Zhejiang Weilin Mechanical Co., Ltd.
Zhejiang Weilin Mechanical Co., Ltd. is a National High-Tech Enterprise specializing in the R&D, manufacturing, and sales of high-performance forged steel crankshafts. Our products are widely used in construction machinery, heavy-duty trucks, generator sets, and marine propulsion. Committed to providing reliable and efficient core powertrain solutions to global customers through excellent materials science, precision manufacturing processes, and a complete quality traceability system.