"车削螺纹" can be translated as "turning threads" or more specifically in a machining context, "thread turning".
Both expressions are commonly used in mechanical engineering and manufacturing fields to describe the process of creating threads on a workpiece using a lathe. For example:
"Thread turning is a common machining operation for creating external or internal threads."（车削螺纹是一种常见的加工操作，用于创建外螺纹或内螺纹。）