Lasys

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10.03.2020 - 13:46

Lightweight Design for Commercial Vehicles: EMAG LaserTec is developing a holistic production solution for large truck differentials

When the catch phrase “lightweight design” is used for the automobile production, it typically refers to passenger cars, rarely commercial vehicles. However, there is an enormous amount of potential for weight reduction and cost savings when considering the large, heavy parts needed for the drivetrain in trucks. Recently, a supplier in North America demonstrated the possibilities and benefits that a complete laser welding production system from EMAG LaserTec can provide.

The commercial vehicle specialist currently uses an EMAG production system that welds three different parts together to manufacture a large truck differential – eliminating approximately 40 costly screwed connections. What type of processes take place in this production line?

A Shell Commercial Vehicle Study predicts that the number of commercial vehicles on the road will continue to rise, very quickly, until 2040. The study claims that the number of new registrations in Germany each year will increase from the current 290,000, all the way up to 344,000, and that the rolling stock of vehicles will reach nearly 3.5 million in 2040 (currently 2.9 million). We will also continue to see the same push for energy efficiency in an effort to achieve climate goals, as well as political pressure on manufacturers to develop vehicles that are more economical. Based on this, a system that will allow manufacturers to achieve a lightweight design in the commercial vehicle sector will be a game changer. Many truck manufacturers have naturally been focusing on well-established light weighting systems from the passenger vehicle sector, that have allowed for massive cost savings with enormous decreases in weight - and that’s precisely where laser welding comes into play. 

For years, laser welding has been essential in the development of drive train workpieces for passenger vehicles. Welded joints now replace screwed connections in many places. Even if a workpiece cannot be made lighter, it can be produced more cost-effectively by eliminating expensive screwed connections. For instance, some modern double-clutch transmissions have no less than 16 laser weld seams — on the various transmission wheels, the double clutch and the differential. With that in mind, it is not surprising that a North American supplier to commercial vehicle manufacturers called EMAG LaserTec. The experts, headquartered in Heubach, Germany, specialize in the development of complete laser welding systems. “The customer knew us, since they already use a variety EMAG machines in other application areas. Their goal is to produce a considerably lighter and more cost-effective large-sized truck differential. This is an ideal task for us, even though we are implementing it for the first time in the truck sector,” explains Dr. Andreas Mootz, Managing Director of EMAG LaserTec. “Having a high level of expertise as a system provider was an absolutely crucial factor for the customer. We develop complete process chains revolving around laser welding, which in principle simplifies planning at the customer end and simultaneously guarantees safe and effective processes.”

Cleaning, Pressing, Welding and Checking in a Single Line

A perfectly timed sequence becomes apparent for truck differentials, it consists of three individual parts before production starts: two housing parts and the ring gear. These each weigh up to 130 kilos (287 lbs) and have a diameter of up to 600 millimeters (24 in). The detailed sequence is as follows:

After being fed by two separate loading stations, the two housing parts and the ring gear run through an EMAG laser cleaning system — a new in-house development that already looks and feels like a standard machine. The process is extremely fast and removes all residues, such as coolants or preservatives, using a focused laser beam.

Robots then remove the parts from the laser cleaning machines. The ring gear is first preheated with induction heating and is then transported to the joining station (preheating is performed using a low-frequency generator by EMAG eldec). The two halves of the housing are directly fed into the joining station and press-fitted together with the ring gear. The process is performed under force/path monitoring.

The subassembly is now ready for welding — a robot loads it into the EMAG ELC 600. After axial clamping, the housing is closed, and the ring gear is joined with the housing using two welds. An EMAG ultrasonic testing system automatically checks the quality of the welded joint — a key step in the process that is just as important to specialists as is the machining of the workpiece.

Within 12 months, the development of this process was completed! The specialists at EMAG LaserTec had to overcome a number of process-related challenges during this time—after all, the weld seams are cast steel/case-hardened steel connections with great depth, which are welded with an 8 kW (11 hp) solid-state laser and with welding additives. Aside from that, the dimensions of the manufacturing system are impressive: The whole system consists of two laser cleaning stations, a heating station, a joining station, the ELC 600, and the ultrasonic testing station, which are interlinked with complex feeding technology and two industrial robots.

A Unique Position in the Market

“This development project perfectly illustrates how we work,” says Mootz about the holistic laser production system. “We always start out with the workpiece and its constituents to develop the matching process with optimal timing and control. This results in customized solutions that stand for productivity and process reliability.” EMAG LaserTec excels in this respect with its tremendous experience and knowledge about transmission and drive components — it has already delivered more than 160 ELC systems in total. EMAG is a global market leader in the area of laser-welded differentials. Another deciding factor is the development based on modular EMAG engineering, which relies on a variety of proven components. Last, but not least, the empirical knowledge gained from automating machine tools provides an even greater advantage when designing and producing such systems. The experts in Heubach are convinced that the current trend in the commercial vehicle sector is converging towards this technology, since the general pressure on cost in production and the need for economical vehicles keep rising. “In any case, we consider ourselves to be well positioned,” concludes Mootz. “Developing holistic production systems based on laser welding is what makes EMAG LaserTec unique in the market.” 

https://www.emag.com/

back to overview
10.03.2020 - 13:46

Lightweight Design for Commercial Vehicles: EMAG LaserTec is developing a holistic production solution for large truck differentials

When the catch phrase “lightweight design” is used for the automobile production, it typically refers to passenger cars, rarely commercial vehicles. However, there is an enormous amount of potential for weight reduction and cost savings when considering the large, heavy parts needed for the drivetrain in trucks. Recently, a supplier in North America demonstrated the possibilities and benefits that a complete laser welding production system from EMAG LaserTec can provide.

The commercial vehicle specialist currently uses an EMAG production system that welds three different parts together to manufacture a large truck differential – eliminating approximately 40 costly screwed connections. What type of processes take place in this production line?

A Shell Commercial Vehicle Study predicts that the number of commercial vehicles on the road will continue to rise, very quickly, until 2040. The study claims that the number of new registrations in Germany each year will increase from the current 290,000, all the way up to 344,000, and that the rolling stock of vehicles will reach nearly 3.5 million in 2040 (currently 2.9 million). We will also continue to see the same push for energy efficiency in an effort to achieve climate goals, as well as political pressure on manufacturers to develop vehicles that are more economical. Based on this, a system that will allow manufacturers to achieve a lightweight design in the commercial vehicle sector will be a game changer. Many truck manufacturers have naturally been focusing on well-established light weighting systems from the passenger vehicle sector, that have allowed for massive cost savings with enormous decreases in weight - and that’s precisely where laser welding comes into play. 

For years, laser welding has been essential in the development of drive train workpieces for passenger vehicles. Welded joints now replace screwed connections in many places. Even if a workpiece cannot be made lighter, it can be produced more cost-effectively by eliminating expensive screwed connections. For instance, some modern double-clutch transmissions have no less than 16 laser weld seams — on the various transmission wheels, the double clutch and the differential. With that in mind, it is not surprising that a North American supplier to commercial vehicle manufacturers called EMAG LaserTec. The experts, headquartered in Heubach, Germany, specialize in the development of complete laser welding systems. “The customer knew us, since they already use a variety EMAG machines in other application areas. Their goal is to produce a considerably lighter and more cost-effective large-sized truck differential. This is an ideal task for us, even though we are implementing it for the first time in the truck sector,” explains Dr. Andreas Mootz, Managing Director of EMAG LaserTec. “Having a high level of expertise as a system provider was an absolutely crucial factor for the customer. We develop complete process chains revolving around laser welding, which in principle simplifies planning at the customer end and simultaneously guarantees safe and effective processes.”

Cleaning, Pressing, Welding and Checking in a Single Line

A perfectly timed sequence becomes apparent for truck differentials, it consists of three individual parts before production starts: two housing parts and the ring gear. These each weigh up to 130 kilos (287 lbs) and have a diameter of up to 600 millimeters (24 in). The detailed sequence is as follows:

After being fed by two separate loading stations, the two housing parts and the ring gear run through an EMAG laser cleaning system — a new in-house development that already looks and feels like a standard machine. The process is extremely fast and removes all residues, such as coolants or preservatives, using a focused laser beam.

Robots then remove the parts from the laser cleaning machines. The ring gear is first preheated with induction heating and is then transported to the joining station (preheating is performed using a low-frequency generator by EMAG eldec). The two halves of the housing are directly fed into the joining station and press-fitted together with the ring gear. The process is performed under force/path monitoring.

The subassembly is now ready for welding — a robot loads it into the EMAG ELC 600. After axial clamping, the housing is closed, and the ring gear is joined with the housing using two welds. An EMAG ultrasonic testing system automatically checks the quality of the welded joint — a key step in the process that is just as important to specialists as is the machining of the workpiece.

Within 12 months, the development of this process was completed! The specialists at EMAG LaserTec had to overcome a number of process-related challenges during this time—after all, the weld seams are cast steel/case-hardened steel connections with great depth, which are welded with an 8 kW (11 hp) solid-state laser and with welding additives. Aside from that, the dimensions of the manufacturing system are impressive: The whole system consists of two laser cleaning stations, a heating station, a joining station, the ELC 600, and the ultrasonic testing station, which are interlinked with complex feeding technology and two industrial robots.

A Unique Position in the Market

“This development project perfectly illustrates how we work,” says Mootz about the holistic laser production system. “We always start out with the workpiece and its constituents to develop the matching process with optimal timing and control. This results in customized solutions that stand for productivity and process reliability.” EMAG LaserTec excels in this respect with its tremendous experience and knowledge about transmission and drive components — it has already delivered more than 160 ELC systems in total. EMAG is a global market leader in the area of laser-welded differentials. Another deciding factor is the development based on modular EMAG engineering, which relies on a variety of proven components. Last, but not least, the empirical knowledge gained from automating machine tools provides an even greater advantage when designing and producing such systems. The experts in Heubach are convinced that the current trend in the commercial vehicle sector is converging towards this technology, since the general pressure on cost in production and the need for economical vehicles keep rising. “In any case, we consider ourselves to be well positioned,” concludes Mootz. “Developing holistic production systems based on laser welding is what makes EMAG LaserTec unique in the market.” 

https://www.emag.com/

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Photos of LASYS

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    LASYS 2020: PM Nr. 5

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    LogoBILDNACHWEIS MESSE STUTTGART
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    LASYS 2020: PM Nr. 4

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    LASYS 2020: PM Nr. 4

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LASYS 2018