Large crankshafts are our main competence. GLMW has the manufacturing capacity to produce crankshafts up to 26 tonnes in weight and 13 meters in length. Large crankshafts are manufactured based on exact design specifications.
In order to completely determine all design parameters such as dimension, weight, material composition, external form, radius, oil drilling channels, surface treatment, counterweights and any other parameter that might be specific to a certain crankshaft, we work closely with our customers.
Reverse Engineering:
If our customer requests for manufacture of a crankshaft based on an existing new or used crankshaft, with the use of highest technology scanning machinery our technicians determine all design specifications of the crankshaft. We complete this process at our manufacturing facilities. If the circumstances require an in-situ application, then our technicians travel to the customer’s location and complete this process on site.
Forging and Heat Treatment:
The primary step into the manufacturing process is the production of forgings. We use both open and closed die forging methods depending on the length of the crankshaft. Producing the forgings in house allows us to have complete control over the quality. In the following step, each forging is applied heat treatment in order to achieve the precise material composition that is required for machining.
Surface Treatment and Hardening:
Hardening of the crankshafts is the most crucial step in the manufacturing process. This is achieved by various surface treatment methods such as nitriding, stroke peening or induction hardening. These methods increase the durability of the crankshaft while enabling an increased engine output and reducing wear.
Mechanical Production:
Each step of the mechanical production – interior & exterior form milling, turning, deep hole drilling, gear forming, grinding, balancing and finishing – is again completed in house in order to have full control over quality.