The CNC lathe chuck fixture equipment mainly refers to the fixture installed on the spindle of the lathe. This fixture is connected with the main shaft of the lathe and drives the workpiece to rotate with the main shaft.
Lathe chuck fixtures are mainly divided into two categories: various chucks, which are suitable for the processing of disc parts and short-axis parts of the fixture. The center hole and the center center are used to locate and install the workpiece. They are suitable for shaft parts with larger lengths or more machining programs. CNC turning processing requires that the fixture should have high positioning accuracy and rigidity, simple structure, strong versatility, easy installation of the fixture on the machine tool, rapid disassembly and assembly of parts, and automation.
1. Various workshop CNC lathe fixtures. In CNC lathe processing, most of the cases use workpieces or blank cylinders for positioning. The following fixtures are the circumference of the positioning fixture.
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The characteristics of the three-jaw chuck The three-jaw chuck is the most commonly used common clamping tool for lathes. The three-jaw chuck is the biggest advantage of automatic centering. It has a large clamping range and fast clamping speed, but the accuracy of the centering error is large. It is suitable for the secondary clamping of the workpiece with coaxiality requirements. In order to prevent the workpiece from deforming and vibrating during turning and affecting the processing quality, when the workpiece is clamped in the three-jaw self-centering chuck, the protruding length should not be too long.
For example: if the diameter of the workpiece is less than or equal to 30mm, the overhang length should not be greater than 3 times the diameter; if the diameter of the workpiece is> 30mm, the overhang length should not be greater than 4 times the diameter. At the same time, it can avoid bending of the top of the workpiece due to the rotating tool, and the top falling and causing a cutter accident. There are two commonly used standard chuck jaws for CNC lathes, namely hard jaws and soft jaws.
2. When the claw clamp is on an unprocessed surface, such as a casting or rough bar surface, a larger clamping force is required, and a hard claw is used; usually, to ensure rigidity and wear resistance, a hard claw is used for heat treatment , The hardness is higher. When two or more parts are required to reduce the diameter runout deviation, and when the workbench is processed and no clamping marks are desired, soft jaws should be used.
The soft jaws are usually made of low-carbon steel. Before use, the soft jaws are boring in order to match the processed workpiece. The biggest feature of soft jaw clamping is that it can maintain a certain position accuracy even if it is clamped multiple times.