The Full Automatic Hydraulic Machine mainly refers to the fixture installed on the spindle of the lathe. The fixture is connected to the spindle of the lathe and drives the workpiece to rotate with the spindle.

Lathe chuck fixtures are mainly divided into two categories: various chucks, suitable for the processing of disc parts and short shaft parts of the fixture. Center holes and center centers are used to position and install workpieces. They are suitable for shaft parts with larger lengths or more machining procedures. CNC turning requires that the fixture should have high positioning accuracy and stiffness, simple structure, strong versatility, easy installation of the fixture on the machine tool and fast unloading of parts, automation and so on.

1, a variety of workshops Full Automatic Hydraulic Machine in CNC lathe processing, most cases are the use of workpiece or blank cylindrical positioning, the following fixtures are positioned around the circumference of the fixture.

The three jaw chuck is the most commonly used ordinary clamping tool for the lathe, the three jaw chuck is the biggest advantage of automatic alignment, the clamping range is large, the clamping speed is fast, but the accuracy error is large, not suitable for the coaxiality requirements of the workpiece twice clamping. In order to prevent the workpiece from deformation and vibration during turning and affect the processing quality, the extension length should not be too long when the workpiece is clamped in the three-jaw self-centering chuck.

For example: workpiece diameter ≤30mm, the overhang length should not be greater than 3 times the diameter; If the workpiece diameter is 30mm, the extension length should not be greater than 4 times the diameter. At the same time, it can also avoid bending the top of the workpiece due to turning the tool, and the top will fall and cause cutting tool accidents. There are two commonly used standard chuck jaws for CNC lathes, which are hard jaws and soft jaws.

2, when the claw is on a raw surface, such as castings or rough rod surface, the need for greater clamping force, the use of hard claws; Usually in order to ensure stiffness and wear resistance, it is necessary to use hard claws for heat treatment, and the hardness is high. Soft claws should be used when two or more parts are needed to reduce the diameter runout deviation, and when the table is machined and no pinch marks are desired. Soft claw is usually made of low carbon steel, soft claw before use, in order to match with the processed workpiece, boring processing. The biggest feature of soft claw clamping is that it can maintain a certain position accuracy even after multiple clamping.

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