What is a double crank press?

Crank press is the most popular stamping and punching power press for industrial area. There are different types, like c frame, h frame, c type, double crank press. Electric motor transfers power to flywheel with belts, flywheel transfer power to second stage gear or directly to the crankshaft. The ram moves along the guides on press body according to the crankshaft rotating. This transmission is simple and stable. Pneumatic type crank press has pneumatic clutch and brake system in the transmission system for more safety. Mechanical type crank press uses conventional rolling key type clutch and mechanisms. Double crank press has two shafts which enable bigger working area for big sheet parts stamping or progressive die stamping.

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Crankshaft material is forged 42CrMo. After machining by CNC lathe, the crankshaft will be rolling treatment to improve the hardness and surface finish. This process improves the resistance of crankshaft, because crankshaft is always rotating inside of the bronze bush. High quality crankshaft ensures the crank press machine service life and precision.

A single crank press and a double crank press are both types of mechanical presses used in metal forming processes, but they differ in design, operation, and applications. Here's a breakdown of the differences between the two:

Single Crank Press

Design:

A single crank press has one crankshaft located at the center of the machine.

The crankshaft is connected to a ram (or slide) that moves up and down to apply force to the workpiece.

Operation:

The single crankshaft provides a central point of force, which is transmitted to the ram to perform the pressing operation.

The ram movement is linear, and the force is concentrated in the center of the ram.

Close Type Single Crank High Precision Presses

Applications:

Single crank presses are typically used for smaller, simpler stamping or punching operations.

They are ideal for producing small to medium-sized parts where the force is applied over a relatively small area.

Commonly used in operations like punching, blanking, and forming.

Advantages:

Simpler design, making them easier to operate and maintain.

Generally less expensive than double crank presses.

Suitable for high-speed production of smaller parts.

Limitations:

The force is concentrated at a single point, which may lead to uneven distribution of pressure across larger workpieces.

Less effective for large, heavy, or complex workpieces.

Double Crank Press

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Design:

A double crank press has two crankshafts, usually positioned on either side of the press.

The crankshafts are connected to a ram that moves up and down, similar to a single crank press.

Operation:

The double crankshafts provide balanced force across a wider area of the ram.

The ram is more stable and less prone to tilting, even when working with large or irregularly shaped workpieces.

Double Crank Press Machine

Applications:

Double crank presses are used for larger and more complex stamping, punching, and forming operations.

They are ideal for producing large parts or components where even force distribution is critical.

Commonly used in the automotive, aerospace, and heavy machinery industries.

Advantages:

More stable and balanced force application, reducing the risk of ram tilting or uneven pressure.

Capable of handling larger and heavier workpieces with precision.

Better suited for complex forming operations that require uniform force distribution.

Limitations:

More complex design, making them more expensive and harder to maintain.

Typically slower in operation compared to single crank presses.

Require more space and a stronger foundation due to their larger size and weight.

Summary

Single crank presses are simpler and more cost-effective, suitable for smaller parts and high-speed operations.

Double crank presses offer better force distribution and stability, making them ideal for larger, heavier, or more complex workpieces.

Choosing between a single crank and double crank press depends on the specific requirements of the metal forming operation, including the size, complexity, and material of the workpiece.

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