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Method for machining extension drill

A processing method and drill technology, applied in the field of mechanical processing, can solve problems such as the inability to meet the processing requirements of extended drill bits

Active Publication Date: 2014-04-02
HARBIN TURBINE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the existing technological scheme cannot meet the processing requirements of the extended drill bit, and to ensure the processing and manufacturing accuracy of the extended drill bit, and further provide a processing method for the extended drill bit

Method used

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  • Method for machining extension drill
  • Method for machining extension drill

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Experimental program
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Embodiment Construction

[0022] The specific implementation method of the present invention is: Step 1: Grinding standard straight shank twist drill bit 60 ° anti-top; 60° anti-top to provide an accurate positioning reference for subsequent sequences;

[0023] Step 2: Turning the welding sleeve; the welding sleeve is an auxiliary part when welding the standard straight shank twist drill and the tool holder to prevent the loss of the flux when it is heated and melted; the inner hole of the welding sleeve and the straight shank outer circle of the straight shank twist drill are 0.2 mm clearance fit to ensure welding precision requirements;

[0024] Step 3: Turning the tool bar; the outer circle of the left end tool bar is matched with the inner hole of the welding sleeve with a clearance of 0.2mm to ensure the welding accuracy requirements; the outer circle of the tool bar taper handle has a grinding allowance of 0.6-0.7mm, and the right end of the tool bar is drilled in the center hole; in order to re...

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Abstract

The invention discloses a method for machining an extension drill, belongs to the field of machining, and aims to solve the problem that the drill coaxiality cannot be met in the conventional process scheme. The method comprises the following steps: welding a straight shank twist bit together with a tool bar by adopting a welding sleeve, and turning the welding sleeve for welding an auxiliary component; grinding the blade excircle and taper shank of the extension drill; grinding a 118-degree taper lead angle and a back angle on a cutter grinding machine. According to the method, the standard straight shank twist bit is welded together with the tool bar, so that the milling stress and deformation of a drill groove are reduced; cutting parameters are optimized, so that the machining efficiency is increased to the maximum extent on the premise of ensuring the machining accuracy; a welding process scheme and the welding parameters are optimized, so that the extension drill has sufficient drill strength and qualified coaxiality and meets the use requirements.

Description

technical field [0001] The invention relates to a processing method for an extension drill bit, which belongs to the field of mechanical processing. Background technique [0002] The extension drill bit is a special tool for processing deep holes (such as processing the axial through hole of the expansion shell of the tube expander, and the axial through hole of the connecting sleeve). For the extension drill bit with a drill diameter less than or equal to Φ12mm, the Welding type, the head adopts the standard straight shank twist drill, the existing processing method is easy to make the extended drill bend. Contents of the invention [0003] The object of the present invention is to solve the problem that the existing technological solutions cannot meet the processing requirements of the extended drill bit, and to ensure the processing and manufacturing accuracy of the extended drill bit, and further provide a processing method for the extended drill bit. [0004] The spe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/32
CPCB23P15/32
Inventor 魏成双崔会彬孙盛丽
Owner HARBIN TURBINE
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