Diameter expanding conical head working part

Abstract

The invention discloses a diameter expanding conical head working part. The working part comprises a regular frustum-shaped diameter expanding conical head and expansion blocks, a connecting hole coaxial with the diameter expanding conical head is formed in the diameter expanding conical head, lubricating oil holes are machined in the large end of the diameter expanding conical head, lubricating oil grooves are formed in the edge faces of the diameter expanding conical head and communicate with the lubricating oil holes, guide rails are mounted on the edges of the diameter expanding conical head respectively, sliding grooves are formed by the adjacent guide rails and the edge faces of the diameter expanding conical head, the expansion blocks are installed in the sliding grooves, and the expansion blocks can move along the sliding grooves. According to the diameter expanding conical head working part, only the lubricating oil grooves are machined in the edge faces of the diameter expanding conical head, and the lubricating oil grooves communicate with the lubricating oil holes, so that machining is simpler, stress concentration is small, and the manufacturing cost is low. Lubrication of the contact surfaces of the expansion blocks and the diameter expanding conical head is better, abrasion is less, the service life of the whole diameter expanding conical head working part is prolonged, the operation cost is reduced, working time of a diameter expanding machine is prolonged, and production efficiency is improved. The working part is used in the fields of pipeline manufacturing and machining.

Description

technical field [0001] The invention relates to the field of pipeline manufacturing and processing, in particular to an expanding diameter conical head working part. Background technique [0002] The current deep-sea oil and gas steel pipes are concentrated on the LSAW pipes with a diameter between 406mm and 762mm. This LSAW pipe has the characteristics of small diameter, high material quality, and thick wall. Because it is used in deep sea, it is especially important to eliminate the internal stress of the steel pipe. For the diameter expansion of the LSAW pipe, the purpose is to achieve the shaping and straightening of the LSAW pipe by expanding the LSAW pipe to the yield point, and to eliminate the residual stress. The working principle of the diameter expanding machine: the oil cylinder drives the expansion cone to move, and under the guidance of the T-shaped guide rail, the expansion block moves radially along the steel pipe, so that the pipe wall is permanently deform...

AI Technical Summary

Problems solved by technology

But there will be disadvantages: on the one hand, processing will cause stress concentration problems inside the expanding cone, and the expanding cone needs extremely high hardness to achieve wear resistance, so the expanding cone is prone to cracks during heat treatment, resulting in expansion. On the other hand, when the expansion cone is processed with T-shaped grooves or grooves, the contact area between the surface of the expansion cone and the expansion block will become smaller, and the contact surface between the expansion block and the expansion cone will not be sufficient. Lubricated and pressurized, prone to wear

The above two aspects not only affect the normal use of the expanding machine, but also increase the operating cost

Images