Inner screw thread milling technique

Abstract

The invention relates to an internal thread milling technique which comprises the steps as follows: a drill bit is installed on a numerical control miller for processing an underport and then the drill bit is withdrawn to be replaced by an internal thread milling cutter provided with a plurality of teeth, the milling cutter is rotated and pushed into the L position of a cutting point at the bottom of the underport and then rotated by 360 degrees by surrounding the core of the port in a spiral line track in the underport to mill thread that is provided with a plurality of thread pitches on a side wall, then the milling cutter is drawn back to the core of the port along a radial direction and withdrawn for a height H to a direction leaving the underport along the radial direction of the underport so as to lead the point of the milling cutter to be completely tallied with the track points of the prior guide distance thread, thereby correctly connecting the prior and the post guide distances; the steps are repeated to mill the internal thread that meets the requirements for the depth of the thread according to the requirements, then the milling cutter is withdrawn and the processing is finished. The milling technique of the invention can complete a plurality of moving guide distances, process the internal threads with different depth at will according to the design requirement, guarantee correct connection between every two adjacent moving guide distances according to a precise calculation formula and improve processing precision and production efficiency.

Description

technical field [0001] The invention relates to an internal thread milling process, in particular to a process for milling internal threads by a numerically controlled milling machine, which belongs to the technical field of mechanical processing. Background technique [0002] The traditional internal thread processing method is to use ordinary drilling machine or lathe tapping method, but when the product structure is limited, this traditional processing method cannot be used, but the internal thread is processed by CNC milling machine and thread milling cutter. [0003] Compared with traditional thread processing methods, using CNC milling machine to mill threads has great advantages in processing accuracy and processing efficiency, and the processing is not limited by thread structure and thread rotation direction. In addition, the durability of thread milling cutter is that of ordinary taps. More than ten times or even tens of times of that, in the process of CNC milling...

AI Technical Summary

Problems solved by technology

However, at present, the process of machining internal threads with CNC milling machines is only limited to shallow internal threads, that is, one lead can complete the processing of internal threads. For deeper internal threads, one tool movement lead cannot complete processing. It is necessary to move multiple leads, and at this time there will be a problem of how to connect the tool between the two motion leads. The solution to the problem of connection will directly affect the machining accuracy, yield and production efficiency of the internal thread.

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