Processing method of deep blind hole

Abstract

The invention discloses a deep blind hole machining method. The deep blind hole machining method comprises the following steps that S1, tool selection is carried out, wherein a center passing tool rodand a common shockproof tool rod are selected as machining tools, the center passing tool rod can be used for center passing machining, and the diameter of an outer circle of the tool rod is larger than half of the hole diameter of a hole to be machined; S2, perforating is carried out, wherein perforating is carried out on a machined piece by using a drill bit, then rough boring is carried out onthe hole, the machining allowance of 3 mm is reserved for the bottom of the hole, and a finish turning allowance of 0.1 mm is reserved for the hole diameter; S3, hole bottom machining is carried out,wherein the two tools are used for machining the hole bottom three times in an alternated mode, each time when machine is carried out, firstly, the center passing tool rod is used for performing machining from the maximum range capable of being machined to the center of the hole, then the common shockproof tool rod is used for machining the rest part to the hole diameter, the depth of the total depth is 1 mm every time when machining is carried out until the depth requirement of the hole is met, and the finish turning allowance of 0.06 mm is reserved; and S4, finish machining is carried out,wherein finish machining is carried out on an inner hole and the hole bottom in sequence so as to finish deep blind hole machining. The deep blind hole machining method solves the problem that a toolis prone to vibration when the hole bottom of the deep blind hole is machined.

Description

Technical field [0001] The invention relates to the technical field of mechanical processing, in particular to a method for processing deep blind holes. Background technique [0002] In mechanical engineering technology, deep blind hole processing has always been a major technical difficulty, and this type of technology has always attracted attention. For the processing method of ordinary holes, several processing steps are required. Generally, the hole is drilled first, then the hole is reamed, and the hole is bored. When the accuracy is high or the roughness is low, reaming and grinding are required. These processing methods can meet the required requirements. However, it is difficult to use these processing methods to meet the requirements for the processing of deep blind holes. [0003] In deep blind hole processing, it is difficult to process due to its deeper hole depth, smaller aperture and large aspect ratio. When selecting a tool, since it rarely processes parts with su...

AI Technical Summary

Problems solved by technology

However, for the processing of deep blind holes, it is difficult to meet the requirements with these processing methods.

[0003] In the processing of deep blind holes, due to the deep hole depth, small hole diameter and large length-to-diameter ratio, it is difficult to process

When selecting tools, since parts with such a large length-to-diameter ratio are rarely processed, ordinary boring tools are used for processing, and it is found that this method cannot be processed at all; and because the boring bar is too long, the rigidity will be poor, and it will Severe tool vibration and tool back phenomenon occur, resulting in the size and roughness of the inner hole of the part that cannot meet the requirements, and the processing cannot continue, which has a serious impact on production

Under normal circumstances, when machining deep blind holes, the length of the tool at the bottom of the hole and the diameter of the tool bar can be as high as 12 times, and it is very difficult to machine the bottom of the hole due to tool vibration.

In order to avoid this kind of tool vibration phenomenon, the selected tool and processing method cannot be selected according to the normal method.

[0004] At present, when the current technology is processing deep blind holes, the tool selection will basically use the super-expensive brand-name anti-vibration tool holder. Even so, it is impossible to achieve the shock-proof effect at the bottom of the hole; The non-standard tool holder is more expensive than the standard anti-vibration tool holder, which increases the cost, and the customization cycle is longer, which delays the production process

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