Method for directly processing threads with dies

Step 2 rotate

The invention relates to a processing method for obtaining the plastic deformation of a threaded workpiece by forming a rolling die.

Step 3 cut

Refers to the method of machining threads on workpieces with forming tools or grinding tools.

Thread milling: milling with disc milling cutter or comb milling cutter on thread milling machine. Disc milling cutter is mainly used for milling trapezoidal external thread on screw, worm and other workpieces.

Thread grinding: it is mainly used to process the precision thread of hardened workpiece on the thread grinding machine. According to the different cross-sectional shapes of grinding wheels, grinding can be divided into single-line grinding wheels and multi-line grinding wheels.

Thread grinding: Nut-type or screw-type thread grinding tools made of soft materials such as cast iron are used to grind forward and backward the parts with pitch errors of the processed thread to improve the pitch accuracy. Hardened internal threads are usually ground to eliminate deformation and improve accuracy.

Tapping: Tapping is to screw a tap into a pre-drilled bottom hole on a workpiece with a certain torque to process internal threads. Turning thread is to cut the external thread on the rod (or tube) workpiece with a mold.

Step 4 rotate

Matters needing attention in thread turning: Considering the enlargement of thread profile, the major diameter (nominal diameter D) of external thread should be turned to be 0.2~0.4mm (about 0. 13P) smaller than the basic size, and the width of tooth tip after thread turning should be 0. 125 P(P is the pitch). When boring the bottom hole of internal thread, ensure that the diameter of the bottom hole is-p.

Extended data

Thread measuring method

① Measurement of included angle of thread

Thread angle is also called tooth angle. The measurement of thread included angle can be realized by measuring the side angle, which is the included angle between the thread side and the vertical plane of the thread axis. The approximate profile of the thread teeth is sampled on the straight line segments on both sides of the thread, and the sampling points are fitted by linear least square method.

② pitch measurement

Pitch refers to the distance between a point on a thread and a corresponding point on an adjacent thread. The measurement must be parallel to the thread axis.

③ Measurement of thread pitch diameter

The pitch diameter of thread is the distance along the axis perpendicular to the pitch diameter line, which is an imaginary line.

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