Partitioned controllable vacuum clamp for weakly-rigid thin-walled planar workpieces

Abstract

The invention belongs to the technical field of mechanical machining, and relates to a partitioned controllable vacuum clamp for weakly-rigid thin-walled planar workpieces. The partitioned controllable vacuum clamp comprises a PC upper computer, a circuit, vacuum solenoid valves, vacuum pressure sensors, a PLC, a vacuum pump, vacuum pipelines, rubber sealing rings, a manual switch, an unloading valve, a silencer, a throttling valve and a vacuum suction device, wherein the PC upper computer performs machining data simulation on a workpiece, optimizes to obtain a pressure preset value, and communicates with the PLC through a built-in data interface; the PLC controls opening and closing of the vacuum solenoid valves on the vacuum pipelines and receives feedback of the vacuum pressure sensorsin vacuum cavities according to data signals transmitted by the PC upper computer; and stable unloading of the system is realized through the manual switch and an unloading loop after machining is finished. By adopting the partitioned controllable vacuum clamp, suction force of different positions is adjusted in real time according to partial deformation conditions of the workpiece, so that the workpiece fully clings to the clamp; stability of workpiece clamping is ensured; and partial deformation of the workpiece is controlled and compensated.

Description

technical field [0001] The invention belongs to the technical field of mechanical processing, and relates to a partition controllable vacuum fixture for weakly rigid thin-walled plane parts. Background technique [0002] At present, there are still many problems in the precision machining of weakly rigid thin-walled planar parts that require extremely high precision in precision physics experiments in our country. The first thing that needs to be solved is the problem of clamping. The clamping of weakly rigid and difficult-to-machine thin-walled planar parts is directly related to the machining accuracy, machining efficiency, surface quality and machining stability of the workpiece. In the process of processing, due to the joint action of clamping force and cutting force, the weakly rigid thin-walled planar parts are easily deformed, such as warping and edge collapse, which directly affect the surface processing quality of the workpiece. By researching and designing fixture...

AI Technical Summary

Problems solved by technology

During the clamping process, due to the severe local deformation of the weakly rigid thin-walled plane parts, the fit between the workpiece and the fixture is poor, and the overall grooved vacuum fixture can only exert the same adsorption force on the workpiece, making it difficult to ensure that the workpiece is effectively adsorbed on the fixture The surface directly affects the clamping stability of the workpiece

Due to the difficulty in processing the groove shape, the groove shape of most grooved vacuum fixtures is wide and the accuracy is low, which directly affects the processing accuracy of weakly rigid thin-walled planar components

When the groove shape of the grooved vacuum fixture is too wide, the supporting force on the workpiece is small, and the adsorption force is large, which can easily cause local deformation of the workpiece along the groove shape.

Therefore, the grooved vacuum fixture cannot meet the clamping requirements for weakly rigid thin-walled planar parts, and the local deformation control and compensation for weakly rigid thin-walled planar parts is always a difficult point in the design of vacuum fixtures

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