Speed and precision paired with high holding forces
Hybrid drive technology from Rexroth combines the strengths of hydraulic and electric drives.
Rexroth teamed up with Berlin-based Bekum Maschinenfabriken GmbH to develop a hybrid drive for the closing system of blow molding machines. The drive not only meets dynamic axis requirements, but also the need for fast, stroke-independent buildup of force at closure and contemporary (low) energy consumption and noise levels.
The innovative hybrid drive leverages the benefits of hydraulic and electric drives to maintain applied forces over extended periods and gently buffer fast changes in direction. It is also efficient, precise, and minimizes noise emissions. To develop this system, which does without a classic hydraulic setup with tank and displacer unit, both partners had to break new ground.
A hydraulic gearbox was fitted between the electric drive and linear axis for the closing system of blow molding machines and is used to convert rotary to linear movement and provide for targeted switching between rapid and power strokes. This considerably reduces the loads for the drive side and the ball screw drive. A locking function in the hydraulic gearbox enables the closing force to be held without drive torque, similar to a classic hydraulic machine.
Internal tests and initial field applications confirm the everyday suitability of the new development.
The hybrid drive can also be used for closing systems involving other applications, such as presses and injection molding machines. This innovative, customized solution is just one example of the many years of experience Rexroth has gained as an engineering partner in development projects.
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Annual Salary Survey
Before the calendar turned, 2016 already had the makings of a pivotal year for manufacturing, and for the world.
There were the big events for the year, including the United States as Partner Country at Hannover Messe in April and the 2016 International Manufacturing Technology Show in Chicago in September. There's also the matter of the U.S. presidential elections in November, which promise to shape policy in manufacturing for years to come.
But the year started with global economic turmoil, as a slowdown in Chinese manufacturing triggered a worldwide stock hiccup that sent values plummeting. The continued plunge in world oil prices has resulted in a slowdown in exploration and, by extension, the manufacture of exploration equipment.
Read more: 2015 Salary Survey