Mechanical clamping device for rotary workbench

Abstract

The invention discloses a mechanical clamping device for a rotary workbench. The device comprises a sliding seat body on the lower part and a workbench on the upper part, and a sliding guide rail surface is positioned between the sliding seat body and the workbench; a piston shaft passes between the sliding seat body and the workbench, the lower part of the piston shaft is connected with a piston, an oily cylinder is matched with the piston, the bottom end face of the piston and the bottom of the oil cylinder form a lower cavity are connected with a hydraulic oil port, and the upper end of the piston shaft is connected with a clamping nut by screw thread; and a disc spring sleeved on the piston shaft is arranged in an upper cavity formed between the upper part of the piston and the upper part of the oil cylinder. By using the mechanical clamping mode of the disc spring, the device has large clamping force, is safe and reliable, and can adjust the amplitude of the clamping force; and the clamping force is directly acted on the sliding guide rail surface, so the device has simple structure and flexible action, does not cause additional deformation of the workbench surface, and can ensure reliable clamping and cannot cause related accidents even if hydraulic faults occur.

Description

technical field [0001] The invention relates to a mechanical clamping device for a rotary table of a horizontal machining center. Background technique [0002] The rotary table is the key functional component of the horizontal machining center. It completes the rotary indexing of the workpiece while realizing the linear motion of the machine tool, and realizes the processing of all surfaces of the workpiece in one clamping. During workpiece processing, the rotary table should be reliably positioned and clamped on the worktable, and the rotary table should release the worktable when it is necessary to rotate the index or exchange the worktable. [0003] At present, the commonly used positioning and locking methods for the rotary table of the horizontal machining center at home and abroad mainly include T-shaped pallet tensioning type, steel ball rod locking type, elastic inclined plane locking type, and lever flat pressing type, etc. The clamping mechanisms of the T-shaped p...

AI Technical Summary

Problems solved by technology

The clamping mechanisms of the T-shaped pallet tensioning type, the elastic slope locking type and the lever plane pressing type are widely used by machine tool manufacturers, but these three clamping mechanisms mostly adopt the four-cone positioning support or the center support method. The force and the support point of the worktable are often not concentric, which causes additional deformation of the worktable under the action of the clamping force, which directly affects the precision of the rotary table and further affects the machining accuracy of the machine tool

Although the steel ball pull rod locking type clamping mechanism realizes the clamping force acting on the positioning support surface, the force action point is reasonable, and the rigidity of the working table is good, but the locking of the working table is realized by the steel ball, and the clamping force Relatively small

At the same time, the above-mentioned clamping mechanisms all adopt hydraulic clamping and hydraulic release. The failure rate of the hydraulic system itself is high, and problems such as pipeline leakage often cause the clamping failure of the above-mentioned mechanisms, and the reliability is low.

[0004] The load of the rotary workbench of large horizontal machining centers is relatively large, often above 10t. The rotary motion usually adopts the type of sliding rotary guide rail, which requires a large clamping force and high reliability of the clamping device, which is difficult for ordinary clamping devices to meet the requirements.

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