Hebei Juliang Technology Co., Ltd. is one of the leading manufacturers and suppliers of heavy duty cnc plasma cutting machine in China. Please feel free to buy CE approved machinery made in China here from our factory. All customized machines are with high quality and competitive price.

product brief introduction

A heavy duty CNC plasma cutting machine is an industrial thermal cutting system built around a gantry structure, combining computer numerical control with high-amperage plasma arc technology to process thick steel plate. The gantry spans the width of the workpiece, traveling along the bed on precision guide rails, while the cutting torch moves across the gantry. The CNC controller manages motion, torch firing, gas flow, and torch height automatically.

Constituent part

Frame:The bed is welded from structural steel and heat-treated to relieve stress. It's heated to approximately 600°C and cooled slowly to eliminate residual welding stress. The entire frame assembly is then annealed, shot blasted, and painted. Rugged dual-beam construction in heavy-duty frames ensures cutting accuracy even with high production demands.

Gantry and Drive System:Precision linear guide rails, mounted on machined surfaces, carry the gantry. These rails are high-frequency quenched and ground for superior rigidity, precision, and stability. Servo motors drive the gantry through bilateral rack-and-pinion systems. Accurate grinding and installation of the rack are vital to minimize backlash, as any play at cutting speeds of 1,000–2,000 mm/min will result in cut errors.

Torch Height Control: A precision arc voltage height adjustment system dynamically maintains the optimal distance between the torch and the steel plate. This is key for consistent cut quality, especially on uneven surfaces. The system continuously adjusts torch height based on arc voltage feedback.

CNC Controller: This controller manages motion, torch firing, gas flow, and height adjustment. It supports nesting software for efficient part placement and reduced material waste. Stored cutting parameters for different materials and thicknesses are readily available. A 17-inch color LCD touchscreen with a USB interface is standard.

application scenarios

Shipbuilding - Cutting hull plate sections and structural components. The machine handles plates up to 6 meters wide and 20 meters long. Plasma's ability to cut through rusted surfaces makes it a standard tool in shipyards.

Steel service centers - Processing plate for customers. The machine runs batches of parts, cutting multiple shapes from each sheet. Positioning accuracy ensures parts meet customer specifications without rework.

Heavy equipment manufacturing - Cutting components for mining equipment, construction machinery, and agricultural implements. Material thickness ranges from 10mm to 50mm on the same job.

Structural steel fabrication - Cutting plates for building frames, bridges, and structural components. The machine cuts bevels for weld preparation directly on plate edges.

Pressure vessel and boiler fabrication - Cutting thick-walled carbon steel plate, often with beveled edges for welding preparation.

Installation and Commissioning

Days 1-2: Mechanical Setup

This phase focuses on assembling the machine on-site, as it arrives in sections. We'll position, bolt, and level the bed sections across their entire length. Ensuring the frame is perfectly level is crucial, especially for longer beds (six meters or more), as even slight unevenness can impact cutting precision. Please ensure the foundation is ready before delivery; a standard industrial concrete floor with sufficient load capacity usually works well.

Day 3: Electrical and Gas Connections

We'll connect the machine to a three-phase 380V power supply. The required amperage will vary based on the plasma system (e.g., a 300-amp system uses around 66.7KVA at peak). Gas lines will be connected: oxygen for plasma cutting and any additional gases needed for dual-gas setups. The CNC control system will be powered on and its basic settings confirmed.

Days 4-5: Test Cutting and Calibration

This is often the most detailed part, taking an extra day or two, as each material and thickness needs specific settings. We'll use test pieces (usually 10mm, 16mm, 25mm, and 40mm plates) to fine-tune cut speed, amperage, gas pressure, and torch height. Our aim is a clean edge with minimal slag. Once these settings are optimized, they'll be saved into the machine's memory.

faq

What is the difference between recommended cut and edge start?

Recommended cut is the thickness the machine can cut at optimal speed with good quality. Edge start is the maximum thickness the machine can cut when starting from the edge of the plate, at reduced speed. Edge start is significantly thicker because it does not require piercing through the full thickness.

How do I know if the electrode needs replacing?

Check the electrode regularly. The hafnium insert (the silver-colored piece in the center) erodes over time. When the crater is deeper than 1mm, replace the electrode. Signs of a worn electrode include difficult arc starting, unstable arc, and reduced cutting speed. Regular inspection prevents sudden failure during production.

What are the signs that the cooling system needs maintenance?

The machine displays a temperature warning on the CNC screen. The torch may feel hot to the touch. Cutting quality may deteriorate as the power source derates. Check the coolant level and flow rate. Inspect the chiller for proper operation. The system should be inspected monthly - low coolant or poor flow is the most common cause of overheating.

What causes the arc to go out during cutting?

The most common causes are worn consumables, insufficient gas pressure, or a poor ground connection. Check the electrode and nozzle first - if the hafnium insert is worn or the nozzle orifice is enlarged, replace them. Also verify that the ground clamp is attached to clean, bare metal near the cut zone.