Hydraulic mandrel for grinding end surfaces of slender pipe fittings

Abstract

Disclosed is a hydraulic mandrel for grinding end surfaces of slender pipe fittings. An elastic sleeve is sleeved on the outside of a mandrel, semi-solid media are filled between the elastic sleeve and the mandrel, a plug is disposed at the outer end of the elastic sleeve, a plunger is connected with the mandrel by a screw, and a screw-plug is further mounted on the plunger. The plunger is a thin-walled part made of non-metal abrasion-resistant materials. An outer circle of the elastic sleeve and center holes of two ends of the mandrel are coaxial when in a free state. The characteristic that a semi-solid body has compressibility and fluidity under the effect of external force and can uniformly transmit the external force is utilized, the thin-walled part can plastically deform under certain external force to clamp a workpiece, a workpiece clamping range is large, the workpiece is clamped reliably, machining quality can be effectively guaranteed, the quantity of tools is reduced, machining cost is lowered, and the service lives of the tools are prolonged.

Description

technical field [0001] The invention relates to a mandrel in a grinding fixture for grinding the end faces of slender pipes by an external grinder, which is used for processing the end faces of the slender pipes whose inner holes and end faces require perpendicularity within 0.002 mm. Background technique [0002] Cylindrical grinder processing and grinding of slender pipe fittings is generally done by placing the workpiece on the round rod mandrel, grinding the end face of the workpiece, or using other auxiliary tools such as plugs. These methods are not suitable for end grinding of slender pipe fittings, especially for large When batch processing, there are mainly the following points: [0003] 1. The use of tooling such as round bar mandrel is time-consuming to set up, inconvenient to operate, and has poor reliability. Turn-around processing must be re-clamped, resulting in changes in the benchmark; tooling is frequently loaded and unloaded, and the tooling is severely wo...

AI Technical Summary

Problems solved by technology

[0003] 1. The use of tooling such as round bar mandrel is time-consuming to set up, inconvenient to operate, and the reliability is poor. The turning process must be re-clamped, resulting in a change in the benchmark; frequent loading and unloading of the tooling, serious wear and tear of the tooling, not suitable for mass production

[0004] 2. There are tolerances in the workpiece, and the actual size of each piece is inconsistent. In mass production, the number of tooling required is large, resulting in an increase in processing costs; and the contact surface between the tooling and the parts is small, which affects the processing accuracy

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