Portable laser 3D scanners simplify closure tube measurements and are designed for them

People familiar with ship engineering and manufacturing processes must know that ship construction mostly adopts the segmented construction method, that is, parts and pre-installed components are combined on the tire frame to weld the component segments or total sections, and then assembled by the ship platform into the construction method
of the whole ship.

At present, the production method of most domestic shipyard closure pipes is basically still stuck in manual mold sampling, making formwork or repairing pipes on ship platforms and shipping sites, completely relying on the experience and skill level of workers, backward technology, high labor intensity but low efficiency, waste of materials and unsafe factors in the on-site operating environment; Some shipbuilders at the forefront of technology will use a more advanced on-site wire to measure the closing tube, although it has been improved, but limited by the interference of narrow operating space and obstacles, the accuracy is not high, and it also particularly affects the measurement efficiency
.

Customer's existing measurement solutions

Use a rope-pull sensor to measure the relative spatial position
of a pair of flanges.

Both ends of the flange to choose 3 bolt holes to install the auxiliary centering reflection target, the measurement site is also arranged a number of reflective targets, the camera is used to shoot multiple pictures from multiple angles, and the software performs picture processing to obtain the spatial position
of a pair of flanges.

Use the stylus measuring machine to measure the relative position of a pair of flanges, each end of the flange select 3 bolt holes to install the auxiliary centering device, through the stylus measuring machine to obtain the spatial coordinates of these 6 points, the relative position
of a pair of flanges is calculated to obtain a pair.

The above methods are to install and disassemble the auxiliary centering device in the bolt hole, need to disassemble and install the pipe end protection, install and erect the measurement equipment on the spot, and the preparation work before the measurement takes more
time.

Although photogrammetry and stylus measurement are relatively limited, they also need to be measured by flange-by-flange, root-by-root closing tube data processing and design
.

CREAFORM recommends handheld 3D scanning measurement solutions

After listening carefully to the customer's underlying appeal, that is, the customer needs to quickly collect the flange data at both ends, and the spaced flange at both ends is connected through the common data of the bottom and the wall, and is directly saved after the scan.

Just after the New Year's Day in 2021, the customer invited us to the door, and when we brought the equipment into the inside of the hull for scanning, although we had made sufficient psychological preparations, when we saw the scene environment, we still inhaled a cool breath
。 Hull space is very limited, the narrow place only allows one person to pass, the surrounding environment is also very bad, so the customer's intention to require fast and high-precision equipment is clear, we only took about 10 minutes to complete the scanning, of course, plus the site environment cleaning and sticking point and other preparations, a total of 40 minutes, compared with the customer's previous full day of measurement time, there is indeed a qualitative leap! In addition, in order to further improve the solution, the CREAFORM team and the customer worked together to study the solution to shorten the preparation time as much as possible, and after in-depth discussion, finally concluded a feasible solution: by presetting the target point on the magnetic film or card, and then adsorbing it in the flange, tube, bracket, bulkhead and other positions, the layout and dismantling of the target point can be quickly completed, and the reuse rate is high; For non-magnetic flanges, they can be quickly fixed
with clips and elastic tabs.

Operating space is limited and only one person can pass through narrow areas

Enables batch measurement and batch design

Use the metrology-grade 3D laser scanner HandySCAN BLACK to perform batch scanning measurements of a multi-pair conjunction flange in a small area (see figure above), obtain a 3D model of the on-site flange tube after the measurement, and then import the scan data into the dimensional inspection software module VXinspect of CREAFORM Shape to extract data features, analyze the data between the measured flanges, and generate a PDF inspection report; Of course, the 3D scan data can also be directly imported into the customer's existing Geomagic ControlX, Polyworks and other reverse engineering software for data processing
.

Data processing for a single flange can be done in less than 2 minutes, i.

Solutions for further convergence

There are many existing closure tube measurement solutions on the market, and the measurement methods, design software, reproducibilizers and control instruction formats of major shipbuilders are all self-contained systems that are independent and cannot be compatible with
each other.

By fusing this 3D scanning measurement solution with the existing solution, i.