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One of the more time-consuming tasks in maintaining continuous-caster steel mills is setting the correct caster roll pass line. Unlike using optics that requires at least 2 operators, the L-743 only requires 1 operator, and since the laser automatically sweeps a reference plane, it is a very simple process to measure and set the heights of a caster segment rolls. The heights can be set using precision inserts with our targets, as the tolerance of the centerline of the target to its base has been accurately controlled.

Features:

  Hamar lasers offer the precision and timesavings to meet the ever-tightening tolerances of the steel industry. The L-743 Ultra-Precision Triple Scan( Roll Alignment System is one of only 2 lasers in the world (L-733 is the other) to offer 3 automatically rotating laser planes, which creates a powerful tool to not only MEASURE but also FIX almost any misalignment problem in continuous caster mills.

The results can be impressive as one of the customers stated:

"[Using lasers, Dofasco has] achieved significant segment repair cost and time savings and has resulted in increased segment life and improved as-cast slab quality."
[Source: AISE Steel Technology, January 2002, PDF, 338K]

Set Roll Pass Line Faster with Fewer Technicians

One of the more time-consuming tasks in maintaining continuous-caster steel mills is setting the correct caster roll pass line. Unlike using optics that requires at least 2 operators, the L-743 only requires 1 operator, and since the laser automatically sweeps a reference plane, it is a very simple process to measure and set the heights of a caster segment rolls. The heights can be set using precision inserts with our targets, as the tolerance of the centerline of the target to its base has been accurately controlled.

Another timesavings feature of the L-743 is that all the rolls of a segment can be checked from one setup and the operator who set the laser up can start doing the measurements himself! Furthermore, the laser can be setup between 2 segments and both of them can be checked at the same time from the same setup!

Easy Squareness and Plumb Measurements for Segment Pins

The L-743 has 3 automatically sweeping laser planes, one horizontal and 2 vertical, which are all square to each other to within 1 arc second (0.00006"/ft or 0.005 mm/M). This means that complex tasks like checking the squareness of the pins to the face of the caster is an easy job for the L-743. This greatly reduces the setups needed to measure squareness when using optics. The L-743 can also be used to easily check the plumbness of the segment pins in the mill itself, as the vertical laser planes have 100 feet (30.5 meters) radius and are plumb when the laser is leveled.

Multiple Targets and Laser Planes Reduces Downtime

With multiple laser planes and multiple targets, the L-743 can take the place of at least 2 sets of optics. Once the laser is setup, multiple technicians can each use a target to realign the mill during planned or unplanned outages. This can save tremendous amounts of time and can bring the mill up that much sooner.

Less Manpower Needed for Alignments

The L-743 Roll Alignment System reduces alignment manpower. Wireless targets and automatically rotating laser planes make setting up the laser at each machine section a one-man job, freeing up technicians for other critical work during shut downs. The wireless readout displays both reference/benchmark targets simultaneously, allowing the operator to quickly buck-in to the benchmarks. Traditional optics usually require at least two men to work the instrument.

Laser Technology Reduces Optics' Variability Between Alignment Crews

PSDs, or position sensing detectors, are one of the critical components of our laser alignment systems. It is this PSD that senses the laser beam and turns it into a digital signal. This greatly reduces the man-to-man variability found in optical measurements because sophisticated electronics determine the measurement rather than the human eye.

Anyone with optical experience knows that the quality of the measurement depends on having the same experienced person perform the entire alignment, which can create big problems when the job takes more than one shift to complete. By relying on the PSD to produce highly repeatable measurements, our L-743 makes it much easier to hand off an alignment project from one crew to the next. This greatly reduces the need to have new crews backshoot the previous crews' work to "calibrate" to their readings.

No Need for Optics' Recalibration After Plumb Measurements

Unlike some optics that usually require time-consuming recalibration of the levels each time plumb is checked, the L-743 can simultaneously check level and plumb from a single setup. This is because the squareness measuring capability is built into the instrument. Furthermore, the levels usually only require calibration once a month, not every time you use it!

Laser Planes Have 200' Range

One of the most powerful features of the L-743 is the automatically rotating laser plane with a range of 100 feet (30.5 meters) in radius. That means the horizontal parallelism of rolls at almost any elevation can be measured simultaneously without having to move the laser vertically. This also allows the laser to be moved to more sections without having to change the location of the reference targets.

Competitive Laser Systems Use 10-Year Old Technology

Our competitors' roll alignment lasers use point-and-shoot laser technology, along with remote beam-bending devices that are difficult to set up and re-locate. We abandoned that laser technology 10 years ago with the introduction of our multi-plane, continuously rotating lasers. Not only is this point-and-shoot technology difficult to set up, it also requires extra manpower and about 50% to 70% more time.

Wireless Targets and Readouts

With Hamar's new line of wireless targets (A-1531, A-1532 and A-1533) there is no need to string long extension cords to reference. These targets have a resolution of 0.001" (0.02 mm) and built-in readouts. With up to 3" of measuring range and height gage measuring capabilities, they are perfect for most steel mill alignment applications.

For higher accuracy applications, our second new line of wireless targets (A-1519, A-1519HR and A-1520) is an ideal alternative. The targets have up to a 1" (25 mm) measuring range, resolutions as low as 0.00002" (0.0005 mm) and can be used up to 100 feet (30.5 meters) from the readout (R-1309), which uses a Cassiopeia PDA, color software and a wireless receiver to display up to four targets simultaneously.

Software Quickly Collects and Analyzes Data

The L-719 can also be linked to our new Plane 5 flatness analyzing software. It is a Windows 95/98 based software that can quickly analyze almost any layout for flatness or straightness. Plane 5 will even analyze squareness if used with our squareness lasers (L-743, L-742, L-741, L-733, L-732 & L-731). Squares, rectangles, frames, circles, rings, and up to four sets of ways can all be easily analyzed with Plane5. The alignment data is automatically downloaded by using our wireless data receiver, the A-908.

HOW IT WORKS
Steel Mills

FEATURES

• 3 continuously sweeping laser planes with operational ranges of 100 feet (30.5 meters) in radius.
• Each laser plane is flat to 1/2 an arc second (0.00003"/ft or 0.0025mm/M) in 180º sweep and 1/4 arc second (0.000015"/ft or 0.001 mm/M) in 90º sweep.
• Planes/beams are mutually square to 1 arc second (0.00006"/ft or 0.005 mm/M).
• Includes Pitch/Roll/Yaw base with medium adjustment screws.
• Standard Targets: A-1533 Single-Axis Target with 3" (75mm) Measuring Range and .001" (.025mm) Resolution and Swiveling Readout.
• Backlit levels accurate to 1 arc second (0.00006"/ft or 0.005 mm/M).
• Instant on with virtually no warm-up.
• Factory-built benchmark fixturing.
• Typical setup time 20 minutes or less.
• Battery or AC powered.
• Completely self contained.