Mandrel alignment tapping device and tapping method

Abstract

The invention discloses a mandrel alignment tapping device and a tapping method. The mandrel alignment tapping device comprises a connection handle and a positioning shaft, wherein the positioning shaft is provided with a cylinder body corresponding to a bottom hole of a screw hole to be tapped, and one end of the positioning shaft is provided with an inner cavity with inner threads; one end of the connection handle is connected with a machine tool, the other end of the connection handle is provided with outer threads which are matched with the inner threads and is provided with a center at the tip, and the center is arranged inside the inner cavity. The method comprises the following steps that: installation: the connection handle and the positioning shaft are installed on a main shaft of the machine tool; correction: the machine tool is controlled to ensure that the cylinder body of the positioning shaft enters into the bottom hole of the screw hole to be tapped, and an angle of the cylinder body is adjusted, so the cylinder body can rotate freely inside the bottom hole; tapping: after the correction, the positioning shaft is unscrewed, and a screw tap is replaced for tapping; or the connection handle and the positioning shaft are unscrewed, and a tapping device is installed to begin the tapping. By utilizing the device and the method to tap, if the screw tap is used for tapping, a ratchet wheel (wrench) is also matched for use, so simplicity in operation can be realized, the efficiency is high, and the tapping verticality is high.

Description

[0001] technical field [0002] The invention relates to a mandrel correction tapping device and a tapping method. Background technique [0003] At present, the thread holes on many large workpieces are tapped at the fitter's place after drilling the bottom hole on the boring hole. The verticality between the tap and the bottom hole is poor when tapping in the existing tapping method, and it is difficult to ensure the thread accuracy requirements. affect work efficiency. [0004] The patent number is 200920294042.5, the name is "self-guiding hand tap", and the announcement date is 2010.11.03. It discloses a self-guiding hand tap, including a tap handle and a tap body. The front end of the tap body is fixed with a guide shaft coaxial with it. . There are following deficiencies in this product: [0005] 1. If the guiding part of the mandrel is too long, it will not be suitable for tapping blind holes; if it is too short, it will not produce a good alignment effect. [0006...

AI Technical Summary

Problems solved by technology

[0005] 1. If the guiding part of the mandrel is too long, it will not be suitable for tapping blind holes; if it is too short, it will not produce a good alignment effect

[0006] 2. It is only suitable for processing small wire holes, and it is a through hole, not suitable for tapping impassable holes

Because when the bottom of the bottom hole is tapped, the effective thread depth cannot be formed, and it is easy to be tightened and broken, resulting in the scrapping of the workpiece

[0007] 3. The above products cannot be aligned with small machine tools such as universal drills, so it is easy to process the hole part of the wire at the entrance, resulting in the out-of-tolerance part of the part hole (if the export product has strict tolerance requirements, it is impossible to produce qualified products )

[0008] 4. Experienced fitters know that when processing large-diameter wire holes, they must be supported by the top; and the above-mentioned products need this product to do auxiliary work to complete.

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