What is the hole making process for steel construction machining?

In the machining and welding of steel structures, hole making inevitably leads to welding shrinkage and deformation. Therefore, in the manufacturing process, knowing when to open the hole can greatly affect the accuracy of the product. So, how much do you know about the hole making process in steel construction machining?

The specification accuracy of the hole group at the site connection position of the column-beam project directly affects the accuracy of the installation of the steel structure, and it is very important to grasp the opening time.

• 1. Drill holes on one end of the component to be assembled. After welding and deformation correction, the other end is drilled.
• 2. When processing steel structure components, first delineate the hole spacing, and then scribe the lines to determine the drilling process after assembly, welding, and deformation correction.
• 3. After the steel construction components are welded and the deformation is corrected, the inner hole is finished, and then the finished surface is used as the standard, and the line is marked.
• 4. When scribing, consider the steel structure welding pressure strength, deformation capacity, allowable tolerance, etc., and drill directly. There are electric drills and pneumatic drills, vertical drilling machines, radial drilling machines, truss radial drilling machines, multi-axis drilling machines, and NC drilling machines.

For gas opening, the simple method is to install a simple auxiliary device on the gas nozzle to make a φ30 hole. Drill die and plate stack drilling, a method of making holes that is not yet popular in China. Fix it with a fixture, and the drill sleeve should be made of carbon steel or alloy steel.

The two planes of the drilling template should be parallel, and the error should not exceed 0.2mm. The drilling sleeve should be perpendicular to the plane of the drilling template, and the error should not exceed 0.15mm. The overall allowable error in the production of drilling dies conforms to relevant regulations.