Liquid expansion mandrel

Abstract

The invention discloses a liquid expansion mandrel, which comprises a mandrel. The mandrel includes a mounting section and a liquid expansion control section respectively located at two ends, and a workpiece clamping section is arranged between the installation section and the liquid expansion control section. A collar for limiting the workpiece is provided between the workpiece clamping section and the installation section; a liquid expansion center hole is provided in the mandrel, and a liquid expansion thin film is set on the workpiece clamping section. A wall sleeve, a liquid expansion communication hole is provided between the liquid expansion center hole and the liquid expansion thin-walled sleeve; the entrance of the liquid expansion center hole is located on the end surface of the liquid expansion control section, and the liquid expansion center The hole includes a small diameter section corresponding to the workpiece clamping section and a large diameter section corresponding to the liquid expansion control section, the liquid expansion communication hole communicates with the small diameter section, and the large diameter section is provided with There is a piston for controlling the hydraulic expansion pressure. The liquid-expanding mandrel of the invention can not only ensure the matching clearance between the workpiece and the mandrel, but also fix the position of the workpiece on the mandrel.

Description

technical field [0001] The invention relates to a mandrel, in particular to a liquid-expanding mandrel. Background technique [0002] The mandrel is a kind of shaft used to support the rotating parts, which only bears the bending moment and does not transmit the torque. Some mandrels rotate, such as the shafts of railway vehicles, etc., while some mandrels do not rotate, such as the shafts supporting pulleys. According to whether the shaft rotates when it is working, the mandrel can be divided into a rotating mandrel and a fixed mandrel. [0003] It is very common in the manufacturing industry to use mandrels to process parts to ensure the coaxiality of the geometric elements of the parts. However, in order to ensure that the fit gap is minimized, the commonly used mandrels all use tapered mandrels. The taper mandrel has a common disadvantage, that is, the axial positioning position of the workpiece on the mandrel is not fixed. It is very inconvenient; so the design can no...

AI Technical Summary

Problems solved by technology

However, in order to ensure that the fit gap is minimized, the commonly used mandrels all use taper mandrels. The taper mandrel has a common shortcoming, that is, the axial positioning position of the workpiece on the mandrel is not fixed, which brings many problems to the machining on the CNC machine tool. It is very inconvenient; so the design can not only ensure the fit clearance between the workpiece and the mandrel, but also fix the position of the workpiece on the mandrel, and it is necessary to use a new mandrel for CNC machine tools.

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