Lead degausser/demagnetizer

The master degausser is not just equipment. This is a guarantee that after magnetic particle testing, the part will not attract chips to the bearing assembly, will not distort the readings of the sensor in the assembly shop and will not cause false alarms in the automation system. We have encountered a situation more than once: a flaw detector identified a crack, but forgot to completely remove the residual magnetization - and after three days, metal dust accumulated on the gear, damaging the oil filter. That's whyleading degausserceases to be an option. It becomes a mandatory step in the NK chain.

Why is “complete” demagnetization not an advertising slogan?

Many people think: “turn it on, twist it, turn it off - and you’re done.” But in practice, 70% of cases of remarriage are associated with incomplete demagnetization. Residual induction above 3–5 G already disrupts the operation of precision components. The leading degausser solves this problem with three key features:

• Deep multi-frequency decrementation- not just a decrease in the field, but its sequential “reset” along a falling sinusoid from 100 Hz to 0.5 Hz;
• Automatic adaptation to dimensions— the system recognizes the mass and shape of the part (through the built-in current sensor and transit time) and corrects the pulse amplitude;
• Zero hysteresis of the output circuit— the magnetic circuit is made of an amorphous alloy, and not of electrical steel, so it does not “remember” the previous state.

In tests on samples made of 40X steel and SCh20 cast iron, we recorded residual magnetization below 0.8 Gs - even with an initial induction of 120 Gs. This meets the requirements of GOST R ISO 9934-1–2019 and ASTM E1444.

“Demagnetizer” is not a synonym for “demagnetizer.” That's why choice requires attention

Some customers confuse the terms: “demagnetizer” sounds technical, but does not always mean complete clearing of the field. A household or simplified demagnetizer often works only on the surface - it removes magnetization in the contact area with the coil, but leaves “magnetic tails” in the volume of large shafts or cast housings. The leading LONGI demagnetizer is designed for a penetration depth of up to 320 mm at a power of 12 kW and a frequency of 50 Hz. For comparison: a typical stationary demagnetizer on average reaches only 80–100 mm.

We observed how at one plant in Uralmash they replaced an outdated device with a new oneleading degausser, and the number of complaints from the assembly shop fell by 94%. Cause? The parts no longer “catch” chips during transportation. No demagnetizer with a constant field would give such a result - only an alternating damped field provides complete disorientation of the domains.

How is the master degausser integrated into the actual production flow?

Installation does not require redevelopment of the workshop. The device is equipped with:

• Portable or stationary reel (diameter up to 1200 mm);
• Control unit with color LCD screen and storage of up to 64 modes;
• LJM-DM v3.2 software for recording protocols and exporting to PDF/Excel.

On the line for testing crankshafts in Tolyatti, we introduced an automatic cycle: the part enters the zone - the photocell is triggered - demagnetization starts - after 18 seconds - the “ready” signal. Cycle time was reduced from 42 to 21 seconds without loss of quality. The key condition is the presence of a grounded network of 380 V ±5% and an operating temperature from +5 °C to +40 °C. No condensation or forced cooling is required: the system uses natural convection through aluminum radiators.

The cost depends on the configuration: the basic version - from rubles, modification with PLC control and network interface - from rubles. Delivery time is 4–6 weeks from the moment of approval of the technical specifications.

LONGI Corporation: 31 years in electromagnetic flaw detection - without compromise in reliability

Shenyang Longji Scientific Electromagnetic Co., Ltd. was founded in 1993. Today, the enterprise in Fushun occupies an area of ​​140,000 m², produces more than 4,000 units of equipment per year and has its own certification laboratory in accordance with GOST R ISO/IEC 17025. More than 60% of employees are engineers with higher education, many have been working in the company since its inception. It was this experience that made it possible to createleading degausser, who not only fulfills the norm - he sets it.

If your task is not to “remove the magnet”, but to ensure that a part will not interfere with the operation of another part, will not distort the measurement and will not cause a failure in operation, contact the developers directly. Not to the intermediary. Not to the import distributor. To those who know how the magnetic field behaves in cast iron at −25 °C and how the cooling rate after heat treatment affects it. Detailed technical specifications, connection diagrams and protocol examples are on the websiteljmagnet.ru.