Many roll forming lines run in workshops with no climate control. If your machine feels sluggish on cold mornings or runs hot by mid-afternoon in summer, temperature is likely the cause.

Seasonal temperature affects three areas most: the hydraulic system, the sheet material, and the electrical controls. This guide covers each one by season and ends with a checklist you can post on the shop floor.

• In winter, focus on warm-up and moisture. Let the hydraulic oil warm up before running at full load, and let cold coils reach room temperature before forming.
• In summer, focus on cooling and corrosion. Keep oil and cabinet temperatures under control, and protect steel from humidity.
• In any season, using the right oil and following the maintenance schedule in the manual costs far less than repairs.

Hydraulic oil thickens in the cold and flows less easily. Starting the machine at full load right away can lead to:

• Pump noise and, over time, pump wear;
• Slower movement of the cutter and cut-off carriage, which can affect length accuracy;
• Unstable pressure or alarms.

A safe habit is to run the machine with no load for 5 to 10 minutes so the oil can warm gradually before production starts. In very cold regions, an oil tank heater may be worth adding.

Oil choice matters too. In cold climates, use a hydraulic oil with good low-temperature performance and follow the manual and your local minimum temperature. 

Pre-painted and high-strength steels lose some toughness at low temperatures. During forming, bends can show:

• Coating cracks or flaking;
• Fine cracks along sharp edges;
• Uneven panel edges.

Simple ways to reduce the risk:

• Store coils indoors or under cover instead of leaving them outside for long periods;
• After moving a coil from a cold area, let it sit at room temperature for several hours before forming;
• Reduce line speed slightly when running thick or high-strength material.

When a cold coil is brought into a warm workshop, moisture condenses on the surface. If that water is rolled into the sheet, it can cause water marks, white spots, and eventually white rust on the coating. It also speeds up rust on the rollers.

Wipe the strip surface with a dry cloth before decoiling, and make sure the rollers and guides are dry.

Grease stiffens in the cold, and chains and bearings turn with more resistance. To compensate:

• Use a grease with better low-temperature performance in winter;
• Turn the drive parts by hand before starting to check for sticking;
• Check chain tension, since metal contracts in cold weather and the setting may differ from summer.

• Large temperature differences can cause condensation inside the control cabinet and harm the PLC, drives, and other components. Keep the cabinet sealed, and consider a dehumidifier or heater where needed;
• Touchscreens can respond slowly in extreme cold, so let the screen warm up after powering on;
• Cable insulation becomes stiff in the cold, so handle and bend cables with care.

Ice and water on the floor are slip hazards. If operators wear gloves, keep sleeves and gloves away from rotating parts to avoid entanglement.

In hot weather, oil temperature keeps climbing during continuous operation. Overheated oil can:

• Become thinner, which lowers viscosity and makes leaks more likely;
• Age and break down faster;
• Cause unstable pressure and lower motion accuracy.

Keep the working oil temperature within the range in your manual. As a general guide, avoid running much above about 60°C for long periods. In practice:

• Check oil level and temperature regularly;
• Clean dust and lint from the oil cooler and radiator fins;
• When oil runs hot, shorten continuous run time and schedule short breaks;
• Add air or water cooling if conditions require it.

High cabinet temperatures shorten the life of drives, PLCs, and contactors, and can trigger over-temperature trips that stop the line unexpectedly. Recommended steps:

• Check that the cabinet fans work and the filters are clear;
• Keep the area around the cabinet free of clutter for airflow;
• If a motor or gearbox runs unusually hot, check for low oil, overload, or dust buildup;
• Avoid leaving the machine in direct sun for long periods.

In humid or coastal areas, galvanized and aluzinc coils are more prone to white rust. To reduce it:

• Store coils off the ground and away from damp floors;
• Keep wrapped coils sealed until needed;
• Pack or cover finished sheets promptly rather than leaving them out in the rain;
• Wipe the strip dry before forming on rainy days.

Heat can thin grease and let it run out, and hoses, fittings, and seals are more likely to weep oil. On your rounds, look for:

• Lubrication points that are dry or have lost grease;
• Leaks at hoses, fittings, and cylinders;
• Seals that need replacing, ideally before a small seep becomes a serious leak.

Thunderstorms are more frequent in summer. Make sure the machine is properly grounded, and avoid outdoor operation during storms. In damp areas or where wiring is aging, confirm that earth-leakage protection is working.

On hot days, provide drinking water and rest breaks. Heat stress reduces concentration and raises the chance of mistakes at the machine.

Winter, before starting:

1. Check oil level and run without load for 5 to 10 minutes;
2. Turn drive parts by hand to confirm nothing sticks;
3. Wipe moisture from the coil surface;
4. Check the cabinet for condensation;
5. In very cold conditions, start at low speed and increase gradually.

Summer, during operation:

1. Check oil temperature every shift and pause if needed;
2. Clean cabinet filters and cooler fins;
3. Inspect hoses and fittings for leaks;
4. Check lubrication points for missing grease;
5. Cover finished sheets to prevent moisture damage.

• Running at full speed right after a cold start. Cold oil can damage the pump and other components.
• Watching room temperature but not oil temperature. Oil often heats up sooner than operators notice, so use gauges and routine checks.
• Loading a cold coil straight onto the line. Condensation damage often shows up only after forming.
• Using the same oil and grease all year. In regions with big seasonal swings, adjust by season or choose products suited to a wider range.

How long should a roll forming machine warm up in winter?

Typically 5 to 10 minutes with no load, depending on ambient temperature and machine setup. The colder it is, the longer the warm-up. Check your manual for specifics.

Can I form pre-painted steel in cold weather?

Yes, but the coating may become brittle. Let the coil reach room temperature first and consider reducing line speed to avoid cracking.

What oil temperature is normal in summer?

It depends on the machine. Follow the range in your manual, and as a general guide avoid long periods well above 60°C. If temperature stays high, check oil level, the cooler, and oil viscosity.

Do I need to change hydraulic oil between seasons?

In regions with large temperature swings, choose a viscosity suited to the season, or use an oil designed for a wider temperature range. Ask your machine supplier for the right grade.

How should I store a roll forming machine that will sit idle?

Clean it and apply rust-preventive oil before shutdown. In winter, guard against cold and damp; in summer, guard against sun and humidity. Before restarting, check oil, lubrication, and electrical systems, then run without load first.