Unlock instant, AI-driven research and patent intelligence for your innovation.

Safe thread tapping method for numerically-controlled machine tool

A CNC machine tool and safe technology, applied in the field of mechanical processing, can solve the problems of low efficiency and high cost, and achieve the effect of reducing tool costs and preventing taps from collapsing

Inactive Publication Date: 2015-06-17
ANQING CSSC MATING POWER
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the shortcomings of common tapping methods or high cost or low efficiency. The present invention provides a method for safe tapping on a CNC machine tool with a group of taps with an ordinary extended shank.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Safe thread tapping method for numerically-controlled machine tool

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0009] Such as figure 1 For the screw hole shown, the screw hole specification is M36, the screw torque is P=4, the thread calibration depth is 54, the thread bottom hole depth is 70, the counterbore size is φ38×130, the material is 35 steel, and it is in normalizing state.

[0010] Ordinary M36×4×280 long shank group taps (head tapping tap and double tapping tap) are used for processing on a horizontal CNC machine tool. Firstly, use the head tapping cone to tap according to the normal program, and the tapping depth D specified by the program is conventionally the thread calibration depth plus 3 times the pitch, that is, D=54+4×3=66, and then use the second tapping cone to adopt the flexible tapping method, A flexible tapping handle with flexible axial compensation function is selected to hold the tap, and the feed per revolution P′ during tapping is set by the program to be 1 / 6 smaller than the screw torque P, that is, P′=4×(1-1 / 6) = 3.33, so that when the second tapping ta...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a safe thread tapping method for a numerically-controlled machine tool. According to the method, a first hand tap of set taps carries out programmed thread tapping according to normal cutting parameters, a flexible thread tapping mode is adopted when secondary thread tapping is carried out, the feed of every rotation during thread tapping is set to be one sixth smaller than the pitch of threads so that a plug tap can has a guiding process of one sixth circumference when entering a spiral surface formed by the first hand tap, the plug tab is made to follow passively with delayed quantity of one sixth pitch of every rotation in the thread tapping process, and spiral surface dislocation can be effectively prevented. The feed is reduced, and the thread tapping depth needs to be adjusted accordingly. The method is especially suitable for the numerically-controlled machine tool to machine a coarse thread screw hole with a deep counter bore in an opening of the hole, wherein the diameter of the deep counter bore is slightly larger than the diameter of the screw hole.

Description

technical field [0001] The invention belongs to mechanical processing technology, and relates to a method for safely tapping a numerical control machine tool. Background technique [0002] Many threaded holes in mechanical parts are processed by tap tapping. Taps are commonly used tools for machining threaded holes on mechanical parts. There are some coarse-thread screw holes with a diameter of more than 30mm on steel parts, and the hole has a deeper sink hole slightly larger than the diameter of the screw hole. Due to the large tapping torque, large chip volume, and difficult chip removal, it is processed on a CNC machine tool with an ordinary tap. There is a risk of crushing the thread, chipping the tap, and breaking the tap, resulting in the scrapping of the workpiece. The usual solutions are: for screw holes with a ratio of thread depth to thread diameter less than 1.5, use a chip tap with an extended handle, and for screw holes with a ratio of thread depth to thread d...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B23G1/16
CPCB23G1/16B23G2210/04
Inventor 杨基义
Owner ANQING CSSC MATING POWER