Withdrawal Unit for Continuous Casting | Non-Ferrous Metal Component

Product Specifications

Technical details and manufacturing context for Withdrawal Unit

Definition

The withdrawal unit is a critical component of a continuous casting machine for non-ferrous metals, responsible for pulling the solidified metal strand from the mold at a precisely controlled speed. It ensures the continuous, stable formation of the cast product by coordinating with the solidification process, maintaining proper tension, and guiding the strand into subsequent cooling and straightening sections. The unit typically consists of motor-driven pinch rolls or caterpillar-type extractors that grip the solidified strand. It operates by applying a controlled pulling force, with the speed synchronized to the casting speed and solidification rate. This precise control prevents breakouts, ensures uniform product dimensions, and facilitates continuous operation of the casting line. Key parameters include traction force (50–200 kN), withdrawal speed (0.5–5.0 m/min), roller diameter (200–400 mm), roller width (150–300 mm), roller gap adjustment range (0–50 mm), motor power (15–75 kW), speed control accuracy (±0.5%), operating temperature (0–60 °C), cooling water flow rate (50–150 L/min), cooling water pressure (0.3–0.6 MPa), electrical supply (380–480 V AC, IEC 60038), degree of protection (IP54–IP65, IEC 60529), and weight (3000–8000 kg). The unit is typically made of alloy steel. These values are reference ranges and must be verified for the specific model and application. The withdrawal unit is essential for maintaining product quality and operational efficiency in non-ferrous metal casting. It must be selected based on strand dimensions, casting speed, and required traction force. Proper maintenance, including monitoring of roller wear, cooling system performance, and alignment, is critical to avoid downtime and ensure consistent output. Always consult the manufacturer for model-specific specifications and compliance with applicable standards.

Working Principle

The withdrawal unit uses motor-driven pinch rolls or caterpillar-type extractors to grip the solidified metal strand. It applies a controlled pulling force, with speed synchronized to the casting speed and solidification rate. This precise control prevents breakouts, ensures uniform dimensions, and guides the strand into subsequent sections. The unit's traction force must exceed the strand weight to avoid slippage, and the speed control accuracy ensures consistent product quality. Cooling water prevents overheating of rollers, and the roller gap adjustment accommodates different strand thicknesses.

Common Materials

Alloy Steel

Technical Parameters

Parameter	Typical range	Notes & selection driver
Traction Force	50–200 kN	Must exceed strand weight to avoid slippage
Withdrawal Speed	0.5–5.0 m/min	Higher speeds require larger motor and cooling
Roller Diameter	200–400 mm	Affects strand surface quality
Roller Width	150–300 mm	Must match strand width
Roller Gap Adjustment Range	0–50 mm	For different strand thicknesses
Motor Power	15–75 kW	Depends on traction force and speed
Speed Control Accuracy	±0.5 %	Ensures uniform strand quality
Operating Temperature	0–60 °C	Above 60°C may damage seals
Cooling Water Flow Rate	50–150 L/min	Prevents overheating of rollers
Cooling Water Pressure	0.3–0.6 MPa	Below 0.3 MPa insufficient cooling
Electrical Supply	380–480 V AC	Three-phase, 50/60 HzIEC 60038
Degree of Protection	IP54–IP65	IP65 for dusty environmentsIEC 60529
Weight	3000–8000 kg	Depends on size and configuration

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Pinch Rolls
Apply gripping force to the metal strand for controlled extraction

Material: Alloy Steel with hardened surface
Drive Motor
Provides rotational power to the pinch rolls

Material: Electrical components and steel housing
Speed Control System
Regulates withdrawal speed through feedback mechanisms

Material: Electronic components and sensors
Frame Structure
Provides structural support and alignment for all components

Material: Structural Steel
Roller Cooling Water System
Keeps the pinch rolls from overheating against the hot strand.
Roll Gap Adjustment
Sets the pinch-roll opening for different strand thicknesses.

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Frequently Asked Questions

What is the function of a withdrawal unit in continuous casting?

The withdrawal unit extracts the solidified metal strand from the mold at a controlled speed, ensuring continuous and stable casting. It maintains proper tension and guides the strand to subsequent cooling and straightening sections.

What are the key parameters to consider when selecting a withdrawal unit?

Key parameters include traction force, withdrawal speed, roller dimensions, motor power, speed control accuracy, cooling requirements, and electrical supply. These must match the specific casting application and strand dimensions.

How does the withdrawal unit prevent breakouts?

By precisely controlling the pulling speed and force, synchronized with the solidification rate, the unit prevents the strand from sticking or tearing, reducing the risk of breakouts.

What maintenance is required for a withdrawal unit?

Regular inspection of rollers for wear, checking cooling water flow and pressure, verifying alignment, and monitoring motor and drive components. Always follow manufacturer guidelines.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Hydraulic system: 10-20 MPa, Roll contact: 50-200 kN/m²
other spec:	Strand speed: 0.5-6 m/min, Withdrawal force: 50-500 kN, Cooling water flow: 20-200 L/min
temperature:	Ambient to 400°C (mold contact zone)

Withdrawal Unit

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Reliability & Engineering Risk Analysis

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