Clamping method and fixture for grinding hole perpendicular to diagonal plane of beveling cylinder

Abstract

The invention discloses a clamping method and a fixture for grinding a hole perpendicular to a diagonal plane of a beveling cylinder. The method comprises the following steps of: clamping a mandrel on a machine tool, wherein the supporting surface of the mandrel is perpendicular to the axis of the mandrel and a positioning sleeve is hinged on the mandrel; and arranging a workpiece in the positioning sleeve to ensure that the diagonal plane of the workpiece is in fit with the end face of the mandrel; and inserting a positioning pin into positioning slots of the workpiece and the positioning sleeve to position the workpiece, pressing the workpiece with a clamp tightly and then grinding and machining a to-be-machined hole on the workpiece. The fixture comprises the mandrel (1) clamped on themachine tool and is hinged with the positioning sleeve (2); and a threaded hole (3) is formed on the positioning sleeve (2) and is connected with the clamp (5) through a compression screw (4). The clamping method is suitable for grinding and machining an inclined hole on a beveling cylinder workpiece, can eliminate the interference phenomenon during the clamping of the workpiece and improves the machining accuracy. The fixture used in the method is convenient to arrange, is easy to operate and improves the production efficiency.

Description

technical field [0001] The invention relates to a clamping method and a fixture for processing a specific part used in a variable displacement pump, in particular to a clamping method and a fixture for grinding a beveled cylinder perpendicular to a beveled surface. Background technique [0002] There is a workpiece with a complex shape on the variable displacement pump. The shape of the workpiece is a cylinder with a beveled surface on the cylinder. There is a hole perpendicular to the beveled surface on the beveled surface. There is a certain angle β (equal to the bevel angle of the beveled surface) between the vertical end faces of the hole. After the rough machining of the hole, it needs to be ground to ensure the smoothness, dimensional accuracy and positional accuracy of the workpiece. At present, the tooling fixture for processing the workpiece adopts a faceplate structure, which is composed of a faceplate and a positioning plate; the faceplate is used to install the f...

AI Technical Summary

Problems solved by technology

[0003] 1. The accuracy of the fixture is poor

Because the β angle of the fixture is fixed; the positioning accuracy of the fixture is mainly affected by two aspects: 1. There is a tolerance for the β angle of the fixture, and there is also a tolerance for the β angle of the workpiece; reflected in actual production, the β angle of the fixture and The value direction of the β angle of the workpiece cannot be consistent; 2. The positioning hole of the fixture and the positioning outer circle of the workpiece have their own tolerances; the gap between them is too small, it is inconvenient to clamp the workpiece, and the gap value is too large, which affects the processing of the workpiece Accuracy; 3. Under the combined influence of these two sets of tolerances, the workpiece will interfere with the fixture when it is clamped, and the positioning reference surface of the workpiece and the positioning support surface of the fixture cannot be completely tightly fitted, and the workpiece cannot be reliably positioned and clamped, reducing the processing Accuracy, not up to production requirements

[0004] 2. The clamp is large in size and poor in structural balance, which affects the machining accuracy of the workpiece

[0005] 3. It is inconvenient to install the fixture on the machine tool, and the production efficiency is low

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