Adjustable step drill bit

A step drill bit, adjustable technology, applied in the direction of step drill, repair drill, drilling tool accessories, etc., can solve problems such as inability to adjust, and achieve the effect of ensuring concentricity requirements

Inactive Publication Date: 2014-10-08
遵义长征电器防爆设备有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are certain defects in the existing step drills, which can drill 2 holes or 3 holes at a time, but the hole diameter and the depth of the stepped holes are fixed and cannot be adjusted.
That is to say, a stepped drill can only process a set of stepped holes

Method used

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  • Adjustable step drill bit

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Embodiment Construction

[0009] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0010] Such as figure 1 As shown, an adjustable stepped drill bit includes: a large drill bit 1, an adjusting screw 2, a small drill bit 4, and a sleeve 7. The whole big drill bit 1 is a cylindrical structure, and its center is provided with a circular through hole 11, and the circular through hole 11 runs through the whole big drill bit 1 longitudinally; Hole 10; one end of the big drill bit 1 is provided with a conical surface 5 for tight fit with the machine tool spindle; the other end is the cutting edge of the big drill bit 1. The small drill bit 4 is located in the circular through hole 11 of the large drill bit 1, and can move up and down in the entire circular through hole 11; on the small drill bit 4, 2 to 5 through holes 8 of the same size are evenly and parallelly arranged horizontally. The sleeve 7 is sleeved on the outer surface of the small dr...

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Abstract

The invention relates to an adjustable step drill bit which comprises a large drill bit body, an adjustment screw, a small drill bit body and a sleeve. The whole large drill bit body is of a cylindrical structure, and a circular through hole is formed in the center of the large drill bit body and longitudinally penetrates through the whole large drill bit body; meanwhile, an unthreaded hole and a threaded hole are transversely formed in the two opposite ends of the middle of the large drill bit body respectively. A conical surface is arranged at one end of the large drill bit body, and a cutting edge of the large drill bit body is arranged at the other end of the large drill bit body. The small drill bit body is located in the circular through hole of the large drill bit body and can vertically move in the whole circular through hole. Through holes same in size are transversely and evenly formed in the small drill bit body in parallel. The sleeve is installed on the outer surface of the small drill bit body in a sleeved mode. Kidney-shaped holes are formed in the two opposite ends of the sleeve. A lug hole is formed in one end of the sleeve. The adjustment screw penetrates through the unthreaded hole, the corresponding through hole, the kidney-shaped holes and the threaded hole to enable the large drill bit body, the small drill bit body and the sleeve to be fastened together. According to the adjustable step drill bit, the drilling diameter and the drilling depth can both be changed, and the concentricity of a step hole can be effectively guaranteed.

Description

technical field [0001] The invention belongs to the field of mechanical manufacturing, in particular to an adjustable stepped drill bit. Background technique [0002] In the machinery industry, the processing of stepped holes is very common, so the stepped drill bit came into being. However, existing step drills have certain defects, that is, 2 or 3 holes can be drilled at one time, but the aperture and the depth of the stepped holes are fixed and cannot be adjusted. That is to say, a stepped drill bit can only process one set of stepped holes. Contents of the invention [0003] In order to overcome the above-mentioned defects, the technical problem to be solved by the present invention is to provide a drill bit with simple structure, convenient operation and adjustable hole diameter and hole depth. [0004] An adjustable stepped drill bit, the stepped drill bit includes: a large drill bit, an adjusting screw, a small drill bit, and a sleeve; the entire large drill bit i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23B51/00
CPCB23B51/009
Inventor 唐秋菊
Owner 遵义长征电器防爆设备有限责任公司
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