Longhole double-spiral inner-cooling drill bit

Abstract

The invention discloses a longhole double-spiral inner-cooling drill bit comprising a drill bit body. The rear end of the drill bit body is further connected with a drill handle, wherein the drill handle is fixed with the drill bit body integrally through welding. The drill bit body comprises a drill bit main body, wherein inner-cooling spiral holes are formed inside the drill bit main body, and meanwhile chip dividing grooves and the inner-cooling spiral holes are further arranged in the drill bit main body. The drill handle comprises a handle body and a connection end which is fixed with the handle body integrally. A blind hole is formed in the middle portion of the connection end. A cooling liquid inlet communicated with the blind hole is further arranged in the connection end, wherein the diameter of the blind hole is identical to the diameter of the lower end of each inner-cooling spiral hole. According to the longhole double-spiral inner-cooling drill bit, abrasive resistance of a titanium alloy deep hole working cutter is improved, rigidity of the cutter is improved, stability in machining is strengthened and cutting resistance in machining is reduced.

Description

technical field [0001] The invention relates to a drill bit, in particular to a deep hole double helix internal cooling drill bit used in the technical field of precision deep hole machining of difficult-to-cut materials. Background technique [0002] At present, titanium alloy precision deep hole processing is a major problem in mechanical processing. During the drilling process, the apex angle is 120°, and the material is YG8 solid carbide standard extended twist drill processing. There are the following processing difficulties: [0003] 1. The cutting temperature is high, the resistance is large, and the bonding phenomenon between the titanium alloy and the cutting tool is serious, resulting in serious bonding wear and abrasive wear of the cutting tool; [0004] 2. Chips are in the form of fragments, which are seriously blocked in deep hole processing and difficult to remove chips, resulting in serious chipping and breaking of the tool; [0005] 3. The cost of tool consu...

AI Technical Summary

Problems solved by technology

[0003] 1. The cutting temperature is high, the resistance is large, and the bonding phenomenon between the titanium alloy and the cutting tool is serious, resulting in serious bonding wear and abrasive wear of the cutting tool;

[0004] 2. Chips are in the form of fragments, which are seriously blocked in deep hole processing and difficult to remove chips, resulting in serious chipping and breaking of the tool;

[0005] 3. The cost of tool consumption is high, and the depth of one-time drilling is about 300 mm

Tool wear and passivation cannot be used, and the processing efficiency is low. It takes 26 minutes to process a 300mm hole depth;

[0006] 4. Poor straightness after deep hole drilling of titanium alloy (straightness is greater than 0.6 mm for 300 mm hole depth), which makes it difficult for precision deep hole follow-up processing to meet precision machining requirements

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