JP2003103404A - Rolling center with center drill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tool having the function of detecting the center of a work and a rolling center with a single tool. SOLUTION: Each of the inside of a rolling center main body 1 and a drive shaft 3 into which a center drill 4 is fitted at the end, is provided with a fixed gear. A spring 5 is fitted into the rear of the drive shaft 3. The drive shaft 3 is capable of sliding back and forth inside the rolling center main body 1 by the expansion and contraction of the rear spring 5.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centering tool for a workpiece and a rolling center tool serving as a center support shaft. 2. Description of the Related Art Heretofore, a work was found by a center drill using a lathe or the like with a center drill, then replaced with a rolling center, and the work was supported and cut. [0003] This has the following disadvantages. Cutting of a workpiece with a lathe or the like required machining the center support of the workpiece with a center drill, replacing it with a rolling center to support the workpiece, and then required two steps and tools for external cutting. . The present invention has been made to solve the above drawbacks. According to the present invention, a gear fixed to the inside of the rolling center body 1 and a drive shaft 3 having a drill 4 provided at a tip thereof is provided. Then, the drive shaft 3 is slid into the inside of the cylindrical rolling center 1, and the spring 5 is installed and installed at the rear portion. The gear 2 fixed inside the rolling center main body 1 and the gear 6 fixed on the drive shaft 3 are pressed and integrated by the pressure of the spring 5. The present invention is a rolling center configured as described above. An embodiment of the present invention will be described below. (A) The drill 4 at the front part of the rolling center of the present invention is pressed against a workpiece, one of which is gripped by a machine tool such as a lathe. (B) Due to the rotation of the lathe, the drive shaft 3 incorporating the center drill 4 at the tip is pressed inside the rolling center main body 1 by the rear spring 5 pressure when the rolling center main body internal gear 2 and the drive shaft gear 6 mesh with each other. , The rolling center body 1 and the drive shaft 3 rotate simultaneously. (C) At the same time that the center drill 4 finishes cutting the center hole of the work, the drive shaft 3 inside the main body pressed by the work presses the spring 5 and slides backward. (D) When the drive shaft 3 slides backward,
The gear 2 fixed to the tip of the inside of the rolling center and the gear 6 fixed to the drive shaft, which have been crimped, come off. At the same time, according to the rotation of the workpiece, only the drive shaft 3 incorporated inside the rolling center starts to rotate. The present invention has the above configuration. By using the present invention, the center of the workpiece is automatically found and worked as a rolling center, so that the work efficiency can be greatly improved.

[Brief description of the drawings] FIG. 1 is a sectional view of a rolling center according to the present invention. [Explanation of symbols] 1 Rolling center body 2 Fixed gear at the tip inside the rolling center 3 Drive shaft 4 Drive shaft tip drill 5 Drive shaft rear spring 6 Drive shaft fixed gear 7 Needle bearing 8 Thrust bearing

Claims (1)

Claims 1. A gear fixed to each of a rolling center body and a drive shaft provided with a drill at a tip is provided so that the drive shaft slides back and forth inside the rolling center body by spring pressure. Rolling center characterized by incorporating.