Explore Xinxinke’s specialized range of Indirect Extrusion Presses (also known as backwards extrusion machines), engineered for high-precision aluminum, copper, and hard alloy processing. By moving the billet and container together against a stationary die, our indirect extrusion equipment eliminates friction along the container wall, reducing extrusion force by 25% to 30% and significantly lowering energy consumption.

Available in capacities from 600T up to 20,000T, Xinxinke indirect extrusion presses deliver uniform mechanical properties, exceptional wall-thickness consistency, and minimal internal defects—making them the ideal choice for high-value tubes, rods, and complex alloy profiles used in aerospace, automotive, power systems, and precision mechanical engineering.

Engineering Principle & Core Advantages of Indirect Extrusion

Unlike traditional direct extrusion, the indirect extrusion process keeps the die stationary on a hollow stem while the container and billet move in unison toward it. Because there is no relative movement—and thus zero frictional force—between the billet outer surface and the container liner, the process yields distinct manufacturing advantages:

l Lower Extrusion Pressure & Energy Savings: Eliminating wall friction reduces total press effort by 25% to 30%. This allows plants to process larger billets, handle difficult-to-extrude hard alloys, or run at higher speeds without over-sizing the press tonnage.

l Uniform Metallurgical Structure & Dimensional Stability: Frictional heating is drastically diminished, preventing localized thermal spikes. As a result, extrusions exhibit a more uniform grain structure from head to tail, preventing sub-surface pipe defects and ensuring consistent mechanical properties for downstream high-precision machining.

l Reduced Die Wear & Longer Liner Life: Minimizing friction and thermal strain extends the operational lifespan of container liners and extrusion dies, dropping tooling maintenance costs over continuous production runs.

When to Choose Indirect Extrusion vs. Direct Extrusion

Selecting between direct and indirect press technology depends on your profile geometry, alloy selection, and surface finish requirements:

Best Applications for Indirect Extrusion

• Precision Tubes & Small-Diameter Rods: Superior concentricity and tight wall-tolerance control make indirect presses ideal for high-pressure seamless tubing, hard alloy rods, and drawn stock.

• Hard Alloys & Aerospace Materials: Highly suitable for 2xxx, 7xxx series aluminum, copper alloys, and materials with low formability where uniform temperature distribution is critical to prevent surface cracking.

• High-Machinability Stock: Eliminates process variation along the extrusion length, ensuring uniform hard-spot-free material ideal for CNC turning and milling.

Technical Trade-offs to Consider

• Cross-Sectional Limits: Max profile dimensions are constrained by the column strength and internal bore of the hollow stem supporting the die.

• Billet Surface Preparation: Because surface skin on the billet can draw into the outer shell of the extrusion, billets must be scalped, wire-brushed, or peeled prior to loading—especially if profiles are intended for high-aesthetic anodizing.

Full Line Integration & Equipment Considerations

Achieving optimal productivity from an indirect extrusion press requires seamless coordination across the entire extrusion line:

1. Billet Heating Uniformity: Multi-zone billet heating furnaces or continuous gas-fired heaters must maintain consistent thermal profiles across the length of the billet to maximize flow symmetry into the stationary die stem.

2. Integrated Auxiliary Support: Combine your indirect press with specialized double-pullers, high-efficiency quenching systems, and precision cooling beds to lock in grain structure and maintain tight profile straightness.

3. In-House Heavy Machining & Customization: Built backed by Xinxinke’s 30+ years of heavy manufacturing capability, every press platen, main cylinder, and container housing is FEA-optimized and internally machined to ensure absolute axis alignment under full working pressure.