Workpiece inner hole machining process

Abstract

The invention relates to the technical field of workpiece drilling, in particular to a workpiece inner hole machining process. A workpiece is provided with an inner hole and a groove, the groove penetrates through the inner hole and divides the inner hole into an upper section hole and a lower section hole which are coaxially arranged, and the upper section hole penetrates through the upper end face of the workpiece and the upper end face of the groove. The workpiece inner hole machining process provided by the invention is simple; in the drilling process, in order to meet the requirement forthe position degree of the inner hole and the groove, a guide hole is formed at a high rotating speed and a low feeding speed through a guide drill, so that the drilling position of a deep hole drillis guaranteed; when the deep hole drill is about to drill the upper end face of the groove, flanging caused by the fact that the deep hole drill drills out of the upper end face of the groove is avoided by reducing the feeding speed of the deep hole drill; and further, when the deep hole drill drills the lower section hole, the deep hole drill makes contact with the lower end face of the groove and drills a positioning hole, so that positioning of the lower section hole is achieved, coaxiality of the formed lower section hole and the formed upper section hole is guaranteed, and the requirementfor the overall position degree of the inner hole is met.

Description

technical field [0001] The invention relates to the technical field of workpiece drilling, in particular to a machining process for the inner hole of a workpiece. Background technique [0002] In the prior art, it is a difficult point to process the inner hole in the osteotomy plate used for knee joint replacement. The inner hole has special features: [0003] 1. The inner hole is divided into two sections by the groove, which leads to the length-to-diameter ratio of the tool for processing the internal control, which increases the difficulty of processing, and at the same time causes the inner hole to form a broken edge structure during processing. Therefore, the processing method of the prior art The accuracy is poor, and it cannot meet the processing requirements of the position of the inner hole relative to the reference of 0.03mm, the height difference of the inner hole relative to the groove of 0.02mm, and the inner hole diameter tolerance of 0.02mm; [0004] 2. The t...

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Problems solved by technology

[0003] 1. The inner hole is divided into two sections by the groove, which leads to the length-to-diameter ratio of the tool for processing the internal control, which increases the difficulty of processing, and at the same time causes the inner hole to form a broken edge structure during processing. Therefore, the processing method of the prior art The accuracy is poor, and it cannot meet the processing requirements of the position of the inner hole relative to the reference of 0.03mm, the height difference of the inner hole relative to the groove of 0.02mm, and the inner hole diameter tolerance of 0.02mm;

[0004] 2. The tool life of the existing processing method is poor, and it cannot meet the requirements of the position of the inner hole and the groove

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