Proofreading technology after forming sheet metal welded shell

There are a large number of large stainless steel box shells in the installation project of an important production line undertaken by our unit in the heat affected zone. There are a large number of 3mm thin plate welded parts and one of them (1500mmxl500mmxl500mm) box shell.

How to calibrate the welded shell of the thin plate is the main technical problem in the processing of the shell, and it is also one of the technical problems in the domestic machinery and welding industry.

In order to ensure the smooth progress of the project, we have studied the welding deformation of the shell from the following aspects.

Among them, a is a partial view of the punch of the bending machine, and b is a 3mm stainless steel plate. Based on the stress distribution area and the calculated stress size, we found the main stress concentration is double-sided welding and double-sided forming Welding seams and arc transition bends. ! The stress-relieving heat treatment process has a single austenite structure, and there is no "isomeric transformation with" during heating and cooling. In these two processes, this type of stainless steel will be completely recrystallized to make the grain Refinement improves toughness. Therefore, heat treatment of the shell is technically feasible.

The stress concentration of the welding seam formed by double-sided welding and double-sided forming is mainly at the welding toe (the maximum stress). According to the stress calculation result and, / i is the applied force.

According to the shape correction and multiple times of all shells, it is mainly composed of a drill sleeve 2, a rotatable drill template 11, a drill mold body 12, a bottom plate 14, three claws 17 and so on. The three jaws can be changed or adjusted according to the size of the bearing hole, and the drill sleeve can also be changed according to the size of the screw hole. In use, first move the corresponding drill sleeve to a certain scale position on the bottom surface of the drill template according to the diameter of the circumference of the center of the screw hole and tighten it, then put the drill mold body and the claw into the bearing hole and tighten The taper-end screw 6 makes the jaws contact with the bearing hole wall and tightens, then you can start drilling. After the first hole is drilled, pull up the latch 9 and rotate the drill template to the desired position according to the number of screw holes. Insert the plug into the corresponding pin hole to drill the remaining holes in sequence. Since there are 12 equal distribution holes on the upper surface of the drill mold body, 3, 4, 6 equal parts of threaded bottom holes can be drilled. If the hole end screw distribution has a certain relative position requirement with respect to the shape of the part, that is, it has directionality, for example, the connection between the center of one screw hole and the center of the bearing hole should be perpendicular to the side of the part, then use the slider 1 to Close the edge, insert the indexing pin, and then tighten the taper end screw to make the long claw tighten in the hole and then drill. After drilling this hole, the slider should be removed. Turn the knurled nut 7 to adjust the pressure on the drill template. Using this drilling die, not only can the center of the threaded bottom hole be better ensured on the same circumference, but also its axis is relatively correct, and the effect is good. There is another use for this drilling tool, which is to use it to draw lines or directly guide drilling. If you want to drill the threaded bottom hole of M10, because there is no M10 drill sleeve due to size restrictions, you can only score the hole.

Of course, you can also use the M6 ​​drill sleeve drill first! The 5mm hole is expanded into the M10 spiral bottom hole.

(Edit Yuehua) Postcode: Guangxi 541004: August 1999

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