Abstract
This article describes the structure and working principle of the blind hole drilling device through application in the production practice proving its feasibility. At present, electrical discharge machining and welding method are commonly used to solve the problem. However, these methods have low processing efficiency, low manufacturing precision and high cost defect. This paper developed an inner wall of the blind hole drilling device, similar to stand-alone machine accessories and adopted the bevel gear transmission which can directly be mounted on vertical or horizontal milling machine, completing the processing operations in few minutes. This device not only has high processing efficiency and accuracy, but it also greatly reduces the production cost.
Highlights
Drilling is a common process in machining processing
It is divided into through hole drilling and the blind hole drilling, in which the deep hole drilling and the abnormal hole drilling belong to the hard machining process, requiring the use of special equipment and tools
The blind hole drilling possesses the following problems: (1) By the inner aperture (φ76) constraints, the blind hole drilling cannot be processed in the conventional machine, and the design of the special tools becomes more difficult [2]. (2) The overhang of special tool is longer and less rigid, which may cause easy knife fight
Summary
Drilling is a common process in machining processing. Generally, it is divided into through hole drilling and the blind hole drilling, in which the deep hole drilling and the abnormal hole drilling belong to the hard machining process, requiring the use of special equipment and tools. The blind hole drilling possesses the following problems: (1) By the inner aperture (φ76) constraints, the blind hole drilling cannot be processed in the conventional machine, and the design of the special tools becomes more difficult [2]. (1) Firstly, a hole is drilled opposite to the blind hole from the outer wall, and the hole is welded after processing [4] This method is simple and practical, the high temperature of welding causes the machined surface deformation and residual stress, influencing precision and service life of the parts. This study aimed at the inner wall of the blind hole drilling characteristics, to design a drilling device by means of horizontal or vertical milling machine, a convenient location and clamping on the barrel, but efficient completion of the blind hole drilling process reducing the production costs [6]
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