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Inner-cooling stepped drill

A step drill and flat-bottomed technology, used in repairing drills, drilling tool accessories, drilling/drilling equipment, etc., can solve the problems of tool breakage and easy wear, and achieve the effect of improving strength, reducing wear and saving use costs.

Inactive Publication Date: 2013-04-17
锑玛(苏州)精密工具股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditionally designed internal cooling drill tip adopts a 140° apex angle and a helix angle of 30°, which is prone to severe wear and tool breakage

Method used

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  • Inner-cooling stepped drill
  • Inner-cooling stepped drill

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0014] like figure 1 , 2 As shown, the inner-cooled step drill in this embodiment is processed by using a CNC five-axis linkage grinding machine and independently programming the tool program. The base material is made of cemented carbide, and the surface is provided with a TIALN coating. Specifically, the drill includes a shank 6 and a cutting edge 1, wherein the R angle part on the head 2 is conducive to uniform force on the drill, good impact resistance, and good heat dissipation. At the same time, it is chamfered and removed for the next process. The margin, the chamfer 3 is directly formed by the workpiece, and the helix angle 4 is 25°, the core thickness is relatively large, the drill has a better strength, and it is not easy to break when the diameter of the drill is relatively small.

[0015] During processing, inject cooling water into the drill bit through the water inlet hole 7 provided at the end of the shank, and the cooling water is drained from the drain hole 5...

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Abstract

The invention aims at disclosing an inner-cooling stepped drill, wherein strength and abrasion resistance of the inner-cooling stepped drill can be improved so that service life of the inner-cooling stepped drill can be prolonged and cost of users can be saved. The inner-cooling stepped drill comprises a handle portion and an edge portion and is characterized in that the bottom of the end of the edge portion is flat and the end of the edge portion is provided with an R angle. The end of the edge portion is provided with the R angle so that margins can be removed before hole drilling, the tool nose is protected, abrasion is small, and the inner-cooling stepped drill is favorable for reducing surface roughness of processed holes, the traditional inner-cooling stepped drill is in a tip mode and is unstable in centering, while the bottom of the end of the inner-cooling stepped drill is flat, and the inner-cooling stepped drill is stable in centering and improves position accuracy of the processed holes. The inner-cooling stepped drill enables a tool to have high strength through a small spiral angle and the flat R-angle tool nose, improves abrasion resistance of the tool nose, accordingly prolongs service life of the tool, and saves use cost.

Description

technical field [0001] The invention belongs to the technical field of tool manufacturing, and in particular relates to an internal cooling step drill. Background technique [0002] As an important part of machining tools, drill bits are mainly used for rough machining of holes. With the development of the machinery industry, users have put forward higher requirements for product processing quality, processing reliability, processing efficiency, and tool delivery time. The tip of the traditionally designed internal cooling drill adopts a vertex angle of 140° and a helix angle of 30°, which is prone to severe wear and tool breakage. The internal cooling stepped drill of the present invention has a flat bottom and an R-angle at the tip of the tool, which protects the tip of the tool and improves the wear resistance of the tool. Contents of the invention [0003] The purpose of the present invention is to propose a step drill with internal cooling, which can improve the str...

Claims

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Application Information

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IPC IPC(8): B23B51/06
Inventor 李振丰孔小波周攀科
Owner 锑玛(苏州)精密工具股份有限公司
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