Method and fixture for controlling welding deformation of igniter

Abstract

The invention discloses a method and fixture for controlling welding deformation of an igniter. A technological threaded hole used for clamping is added in a large joint inner cavity of a boss of theigniter, a hole is designed in the middle part of a traditional positioning bolt, then, the boss is tensioned by employing a screw, so that the boss is fixed onto the bolt, and then, the boss not onlyis positioned but also is clamped; a square hole is formed in a suitable position of a fixture body corresponding to a welding seam, so that a welding gun is prevented from interfering with the fixture body, and an assembly is welded under a rigid constraint state; and a part welding way is changed, i.e., a part is changed into a vertical state from a horizontal state, so that the phenomenon thata welding pool of the welding seam sags due to self gravity to form excrescences making connection unreliable in the inner cavity is avoided.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a method and a fixture for controlling the welding deformation of an aero-engine igniter. Background technique [0002] Such as figure 1 The aero-engine igniter assembly is shown. The assembly is formed by welding the mounting side 1, the lower shell 2, the upper shell 3, and the boss 4. After welding, the inner cavity and the end surface of the two joints of the mounting edge 1 and the boss 4 are machined. Wait. The lower shell 2 and the upper shell 3 are butt-buttoned (the branch is matched with the limit) to form a closed inner cavity of the ignition generator. The inner cavity of the ignition generator is assembled in the "waist-shaped" inner hole of the installation side 1, along the "waist "Type" hole edge welding, so that the ignition generator inner cavity and the installation edge form a permanent connection; the upper end of the ignition generator is provided with a ...

AI Technical Summary

Problems solved by technology

The fixture configured in this process plan, the step pins A4 and A6 only have positioning function, but no clamping function, and the distance between the parts and the clamp is limited, and the welding torch cannot be inserted into the welding, so the fixture only has the function of positioning welding, not welding. , that is, the parts are first positioned on the fixture for welding, and the welding must be removed and welded in a free state. The welding deformation is not controlled, resulting in the position and size of the two joints of the boss 4 not being guaranteed, so that when the joint is machined later, the wall thickness is out of tolerance, or even The problem of "gap" causes the product to be scrapped; in addition, the welding seam of this process method is in a vertical position, and the welding tumor in the inner cavity of the component is difficult to control. If the tumor is combined with the main body of the part, if it is not strong enough, the engine will vibrate violently when it is working. Cause the tumor to fall off, form redundant matter, and cause the engine to fail

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