Hole depth detector for numerically-controlled machine tool

Abstract

Disclosed is a hole depth detecting device for a numerical control machine tool, the detecting device comprising a housing, a position detecting unit (3), a control unit (11), a main shaft (6), a drill chuck (2), a probe (1) and a spring (5), wherein the position detecting unit (3) and the control unit (11) are provided in the housing, the drill chuck (2) is coaxially provided at the front end of the main shaft (6), the probe (1) is coaxially provided at the front end of the drill chuck (2), the rear part of the main shaft (6) is able to slide coaxially in the housing and passes through the housing, the housing is provided with a positioning block (4) fixedly provided in the middle part of the main shaft (6), the spring (5) is sheathed coaxially onto the main shaft between the rear end face of the positioning block (4) and the inner wall of the housing, and the front end face of the positioning block (4) is in contact with the position detecting unit (3). The device can be used to detect whether the drill for machining a through-hole is broken in a deep hole during machining.

Description

technical field [0001] The invention belongs to the field of numerical control machine tools, and relates to a hole depth detection technology of numerical control machine tools, in particular to a hole depth detector for numerical control machine tools. Background technique [0002] Usually, when the CNC machine tool is processing a threaded hole, the first step is to process a threaded bottom hole with a drill bit, and the second step is to use a tap to process the internal thread of the hole. [0003] However, in the process of actual threaded hole processing, especially for threaded bottom holes with small diameter and long hole depth, the first step of processing is easy to break the drill bit, and the broken part of the drill bit remains in the bottom hole ;In this case, directly proceed to the second step of threaded hole processing, which will cause the tapping tap to be broken by the drill bit left in the threaded bottom hole, thus shortening the service life of the...

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Problems solved by technology

[0003] However, in the process of actual threaded hole processing, especially for threaded bottom holes with small diameter and long hole depth, the first step of processing is easy to break the drill bit, and the broken part of the drill bit remains in the bottom hole ;In this case, directly proceed to the second step of threaded hole processing, which will cause the tapping tap to be broken by the drill bit left in the threaded bottom hole, thus shortening the service life of the tap, and even causing parts to Scrap, reducing the yield of parts; at the same time, replacing taps also prolongs the processing time of parts

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