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Stepped drill capable of preventing 180-dgree stepped angle blade tipping

A step-angle and step-drilling technology, which is applied in the direction of step drilling, drill repairing, drilling tool accessories, etc., can solve the problems of easy chipping, poor strength, large force, etc., and achieve the effect of improving mechanical strength

Active Publication Date: 2020-04-28
苏州锑玛刀具科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention provides a step drill that prevents edge chipping at a step angle of 180°, and its purpose is to solve the problem that the edge of a step drill with a step angle of 180° is poor in strength and easily chipped due to high force during cutting

Method used

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  • Stepped drill capable of preventing 180-dgree stepped angle blade tipping
  • Stepped drill capable of preventing 180-dgree stepped angle blade tipping
  • Stepped drill capable of preventing 180-dgree stepped angle blade tipping

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Example 1: A stepped drill that prevents edge chipping at a step angle of 180°

[0039] This embodiment is a stepped drill designed for 1215 free-cutting steel with hardness ≤ HB160 as the processed material.

[0040] Such as Figure 1-4 and Figure 8-9 As shown, the stepped drill is composed of a handle 1 and a blade 2. The blade 2 is provided with a corner edge 21, a first step 22, a second step 23, a third step 24 and Flutes 29 (see image 3 ). The first step 22 is provided with a first step support margin 221, the second step 23 is provided with a second step support margin 231, and the third step 24 is provided with a third step support margin 241 (see image 3 ). A chamfering edge 25 is provided between the first step 22 and the second step 23 (see image 3 ). A 180° step angle blade 18 is provided between the second step 23 and the third step 24 (see image 3 and Figure 4 ), the 180° stepped angle blade 18 is composed of sequentially arranged inner cham...

Embodiment 2

[0047] Example 2: A stepped drill that prevents edge chipping at a step angle of 180°

[0048] This embodiment is a stepped drill designed for the processed material to be 304 stainless steel with a hardness ≤ HV210.

[0049] Such as Figure 1-4 and Figure 8-9 As shown, the difference between embodiment 2 and embodiment 1 is that the first shear face angle 7 is 22°±2°, the first shear face width 8 is 1.8-2.2mm; the second shear face angle 10 is 4 °±2°, the second shear plane width 11 is 0.2-0.4mm. Others are the same as in Embodiment 1, and will not be described again here.

Embodiment 3

[0050] Embodiment 3: A step drill that prevents chipping of the blade at a step angle of 180°

[0051] This embodiment is a step drill designed for the material to be machined as 42CrMo and the hardness as HB207-255.

[0052] Such as Figure 1-4 and Figure 10 As shown, the difference between embodiment 3 and embodiment 1 is: the third shearing surface 12 is ground at the edge of the side surface 19 of the 180 ° step angle blade 18, and the third shearing surface 12 is in the second shearing Grinding and forming on the basis of the surface 9, the third shearing surface 12 is correspondingly formed with a third shearing rake angle 13 and a third shearing surface width 14 (see Figure 10 ).

[0053] The angle of the third shearing face angle 13 is smaller than the angle of the second shearing face angle 10, and the angle of the third shearing face angle 13 is located in the angle area of ​​the second shearing face angle 10; The third shear plane width 14 is smaller than the ...

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Abstract

The invention provides a stepped drill capable of preventing 180-dgree stepped angle blade tipping. The stepped drill is characterized in that two or more shearing faces are ground at a side-face cutting edge corresponding to front corners of a 180-dgree stepped angle blade, the latter shearing face is ground to be formed in the mode of being close to the cutting edge based on the former shearingface, shearing face widths corresponding to all the shearing faces are gradually contracted in sequence, angles of shearing face front corners corresponding to all the shearing faces are also gradually contracted in sequence, and thus all the shearing faces form sequentially-superposed blade shearing deflection folded faces at the side-face cutting edge. The characteristics of the cutting propertyand the mechanical strength of the blade can be balanced well through the means that the double shearing faces or multiple shearing faces are superposed and combined, the cutting property and the mechanical strength of the blade are ensured, supporting blade belts at the former stage and the current stage are not damaged, it can be guaranteed that tool nose tipping or tool breaking caused by insufficient strength or cutting force is avoided, and the service life of a tool is prolonged.

Description

technical field [0001] The invention belongs to the technical field of machining tools, in particular to a stepped drill capable of preventing blade chipping at a step angle of 180°. Background technique [0002] As an important part of machining tools, drill bits are mainly used for hole processing. With the development of the machinery industry, users have put forward higher requirements for the processing quality, processing reliability, processing efficiency and delivery time of cutting tools. [0003] In step drills, see attached Figure 5 , except for the corner blade (see attached Figure 5 21 in ) and also with a chamfered edge (see attached Figure 5 key 25 in ) and flat-edged blade (see attached Figure 5 number 18 in ). Flat angle blade is also the so-called 180 ° step angle blade in the utility model. For the drilling processing of workpieces with 180° step angle pass, it has become a difficult problem in the field of drilling processing technology. [0004] S...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23B51/00
CPCB23B51/009
Inventor 李振丰奚旭东孔小波张明敏
Owner 苏州锑玛刀具科技有限公司