A Method for Machining Wave Threads Using Numerical Control Macro Programs

Abstract

The invention discloses a process for machining corrugated threads through a numerical control macroprogram. The process includes the steps that two-dimensional CAD software is used for making a drawing precisely, and a machining profile is converted into a functional equation by taking a workpiece coordinate system formed during machining as a benchmark and data in the drawing as a basis; a portion to be cut off is divided into two parts, one part is efficiently cut off in a rough turning method and the other part is precisely cut off in a finish turning method. The process combines advanced CAD and CAM technologies, and the numerical control macroprogram, the calculus thought and a functional locus equation are introduced creatively. The process has the advantages that equipment is easy to use, programming is simple, applicability is high, and the process can be widely applied to machining R type threads and T type threads.

Description

technical field [0001] The invention relates to a method for processing wave-shaped threads, in particular to a method for processing wave-shaped threads by using a numerical control macro program, and belongs to the technical field of mechanical processing. Background technique [0002] The shank, drill pipe and bit of the hydraulic rock drill are widely used in wave thread connection, which has the advantages of high impact fatigue resistance, fast disassembly and good rigidity under the condition of using the same material. During the drilling process, the threads are subject to high-frequency pulsating impact loads, and at the same time transmit a large torque, which puts forward higher requirements on the quality of wave threads. [0003] The cross-section of the left-handed wave thread is a wavy shape with positive and negative circular arcs tangent. Due to the special thread profile and large pitch, it is very difficult to process. [0004] The traditional processing...

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Problems solved by technology

[0003] The cross section of the left-handed wave thread is a wavy shape tangent to the positive and negative arcs. Due to the special thread profile and large pitch, it is very difficult to process.

[0004] The traditional processing method is the profiling method, which has a large cutting resistance and will lead to insufficient rigidity of the workpiece when the length and diameter are relatively large, and the process system is prone to severe vibration, which restricts the quality and production efficiency of the product;

[0005] In recent years, domestic and foreign drilling tool manufacturers mostly use sharp knife eccentric cyclone milling method to process wave thread. This method greatly improves the quality and production efficiency of thread, but this method requires complicated process tooling and has poor applicability;

[0006] With the rapid development of CAE and CAM technology, some manufacturers have begun to use the thread cutting command G92 to process wave-shaped threads. This method is advanced in thought and can be completed by ordinary CNC machines, but the programming is complicated and the program applicability is poor. Move the whole body with one shot"

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