Hydraulically-driven constant-pressure constant-displacement friction stir welding spindle unit

Abstract

The invention discloses a hydraulically-driven constant-pressure constant-displacement friction stir welding spindle unit which is used for solving the problem of constant-pressure constant-displacement control in the heavy-load friction stir welding process. The friction stir welding spindle unit is mounted in a fork-shaped structural part at the end of a ram of a gantry body frame, and welding of a longitudinal seam of the box bottom is completed along a welding track through the gantry body frame and a double-fork piece; the friction stir welding spindle unit is characterized in that an outer sliding box and a main shaft shell are driven by pressing two groups of symmetrical shaft shoulders into a servo oil cylinder, a cylinder body tailstock of the servo oil cylinder is fixedly connected with the outer sliding box, a plunger of the servo oil cylinder is fixedly connected with the main shaft shell through a connecting piece, and the plunger extends out or retracts back through a control oil cylinder, so that the outer sliding box and the main shaft shell move relatively, in other words, the motion is the pressing motion of a shaft shoulder, and the axis is defined as a Z1 axis;sliding blocks are fixedly connected with the outer sliding box, a linear guide rail is fixedly connected with the main shaft shell, and the four sets of symmetrically-arranged sliding blocks and thelinear guide rail form a guide mechanism for shaft shoulder press-in movement; the servo oil cylinder of the Z1 axis is connected with a high-frequency proportional valve.

Description

technical field [0001] The invention relates to a hydraulically driven constant pressure and constant displacement friction stir welding spindle unit, which can be used to solve the problem of constant pressure and constant displacement control in the process of heavy-duty friction stir welding, and belongs to the development technology of friction stir assembly welding automation equipment for large storage tanks of launch vehicles field. Background technique [0002] With the development of my country's aerospace industry, higher requirements are put forward for the carrying capacity of the launch vehicle, so its structural scale has a significant trend of gradually increasing. Taking the heavy-duty launch vehicle (CZ-9) under research in my country as an example, the maximum diameter of the core-level tank reaches 10m, and the maximum wall thickness of the tank reaches 18-24mm. According to the practical experience of welding and forming tanks of existing models in our f...

AI Technical Summary

Problems solved by technology

[0006] The technical solution of the present invention is: a hydraulically driven constant pressure and constant displacement friction stir welding spindle unit, which is used to solve the problem of constant pressure and constant displacement control in the heavy-duty friction stir welding process. The friction stir welding spindle unit is installed on the gantry Inside the fork-shaped structural member at the end of the main frame ram, the longitudinal seam of the box bottom is welded along the welding track through the main frame of the gantry and the double fork; including:

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