A hydraulic clamping fixture for grinding machines that uses internal expansion for positioning.

By designing a hydraulic fixture for grinding machines with internal hole expansion and positioning, and utilizing a hydraulic cylinder and injection-molded expansion sleeve structure to eliminate the internal hole positioning gap, the problem of machining accuracy caused by the clamping error of the grinding machine fixture is solved, achieving high-precision part positioning and stable clamping.

CN224425237UActive Publication Date: 2026-06-30DANJIANGKOU DANJIANG AUTO TRANSMISSION SHAFT CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
DANJIANGKOU DANJIANG AUTO TRANSMISSION SHAFT CO LTD
Filing Date
2025-07-14
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing grinding machine fixtures have clamping errors when positioning the inner hole, which affects machining accuracy.

Method used

A hydraulic fixture for grinding machines with internal hole expansion and positioning is designed. It adopts a structure of oil cylinder, tie rod, rotary disk and fixed center. The internal hole of the part is uniformly expanded and tightened by injection molding expansion sleeve at the end of the rotary disk, thus eliminating positioning gap.

Benefits of technology

It improves the positioning accuracy and clamping stability of the fixture, ensures the machining accuracy of parts, and facilitates the loading and unloading of parts.

✦ Generated by Eureka AI based on patent content.

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    Figure CN224425237U_ABST
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Abstract

This utility model discloses a hydraulic chuck for grinding machines with internal hole expansion and positioning. It includes a cylinder, a pull rod, a rotary disk, and a fixed center. The pull rod is connected to the cylinder and passes through the rotary disk and the fixed center. The fixed center is mounted on the grinding machine spindle. The rotary disk is mounted on the fixed center via a tapered roller bearing. A top cover is installed at the center of the end of the rotary disk, and a telescopic rod is installed at the end of the rotary disk via an injection-molded expansion sleeve. One side of the telescopic rod is pressed into the end face of the fixed center. In this hydraulic chuck for grinding machines with internal hole expansion and positioning, the fixed center portion of the chuck is fitted with the Morse taper hole of the machine spindle. The tail cylinder, through the structure of end face bearings, a pull rod, a fixed center, tapered roller bearings, a rotary disk, a telescopic rod, and an injection-molded expansion sleeve, enables the cylinder to drive the injection-molded expansion sleeve to move left and right. This allows the injection-molded expansion sleeve to expand evenly under the movement of the right-end inclined surface of the rotary disk, eliminating the positioning gap in the internal hole.
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