Comparison Between Front-Loading and back-Loading (Movable extrusion stem) of Short-Stroke Aluminum Extrusion Presses

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Comparison Between Front-Loading and back-Loading (Movable extrusion stem) of Short-Stroke Aluminum Extrusion Presses: Advantages and Disadvantages

1. Short-Stroke Front-Loading Aluminum Extrusion Press

1.1 Structural Features:

1.1.1 Loading Position: Billets are fed between the container and front platen. The container retracts to allow billet insertion, then advances to clamp the billet.

1.1.2 Stroke Optimization: Extrusion stroke reduced by 50% vs. Traditional aluminum extrusion presses, enabling compact design.

1.2 Advantages of Short-Stroke Front-Loading Aluminum Extrusion Press

1.2.1 High Precision:Excellent billet alignment (±0.1mm), ideal for precision tubes (e.g., automotive applications).

1.2.2 Efficiency:

1.2.2.1 Higher 20%-30% output due to shorter non-extrusion time;

1.2.2.2 Lower energy consumption with reduced hydraulic oil usage.

1.2.3 Automation: Servo-controlled billet loader ensures high repeatability.

1.3 Disadvantages of Short-Stroke Front-Loading Aluminum Extrusion Press

1.3.1 Billet Requirements: Poor compatibility, ask for smooth cut view face of billets (unevern end faces is not friendly.

1.3.2 Maintenance: Frequent replacement of container heating elements.

2.Short-Stroke back-Loading (Movable extrusion stem) aluminum Extrusion Press

2.1 Structural Features:

2.1.1 Loading Method: extrusion stem retracts from centerline, billet is pushed into container, then extrusion stem returns for extrusion.

2.1.2 Stroke Efficiency: Extrusion stroke slightly exceeds the length of extrusion billet, cutting traditional stroke by >50%.

2.2 Advantages of Short-Stroke back-Loading (Movable extrusion stem) aluminum Extrusion Press

2.2.1 Versatility:

2.2.1.1 Two sections of aluminum billets can be connected to use at the billet loader, reducing scrap rate by 25%-30%;

2.2.1.2 Tolerates hot-shear billets without precision cutting.

2.2.1.3 Stability: Pre-stressed columns minimize deflection, enabling 15%-20% faster extrusion speeds.

2.3 Disadvantages: of Short-Stroke back-Loading (Movable extrusion stem) aluminum Extrusion Press

2.3.1 Surface Quality: Higher roughness (Ra 3.2-6.3μm) requiring post-processing.

2.3.2 Flexibility: Longer die-changing times and it will increase auxiliary time.

3. Selection Guidelines

3.1 Precision-Critical: Front-loading (e.g., aerospace/automotive).

3.2 Cost-Sensitive Mass Production: back-loading (e.g., construction profiles).
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