Process for improving wall thickness accuracy of medium-thick wall pipe

A thick-walled pipe and high-precision technology, which is applied in the direction of manufacturing tools, metal processing equipment, metal rolling, etc., can solve problems such as the inability to produce special-shaped cross-section pipes, the increase in deformation caused by cold processing, and the difficulty in ensuring the quality of stainless steel pipes, etc.
CN109092900AInactive Publication Date: 2018-12-28LINZHOU FENGBAO PIPE
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Patent Information

Authority / Receiving Office
CN ¡ China
Patent Type
Applications(China)
Current Assignee / Owner
LINZHOU FENGBAO PIPE
Publication Date
2018-12-28
Estimated Expiration
Not applicable ¡ inactive patent
Patent Text Reader

Abstract

The invention discloses a process for improving the wall thickness accuracy of a medium-thick wall pipe, comprising the following steps: S1, steel pipe casting: selecting a suitable steel ingot and melting the steel ingot and pouring the melted ingot to produce a pipe blank; S2, piercing machine correction: setting a keyway of a connecting sleeve at the top of a piercing machine as a semicircularkeyway; S3, cold centering machine punching detection: detecting punching of a perforator; S4, coefficient modification: changing the frame speed and tension coefficient of the hole type to 0.05+ / -0.01; S5, centerline adjustment: ensuring that the rolling centerline of the piercing machine is consistent with the centerline of a piercing trolley, so that the force applied to the pipe blank during piercing is uniform. Through head technical modification, the system specification of the centering hole and the optimization of the tension coefficient of the sizing mill, the yield of the medium-thick wall pipe with the wall thickness of 16 to 35 of 273 pipes can be stabilized at 93 percent or more.
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Description

technical field

[0001] The invention relates to the technical field of steel pipe production and processing, in particular to a process for improving the wall thickness accuracy of medium-thick-wall pipes. Background technique

[0002] Stainless steel seamless pipes are made from solid blanks, and steel pipes are produced by hot piercing, hot rolling or cold working. The type and level of the unit mainly depend on hot working, cold working (the main methods are cold rolling and cold drawing) and heat treatment process. Therefore, the production and product quality of stainless steel seamless pipes mainly depend on the main links of raw materials, hot processing and cold processing. It is in these main links that there is a big gap in the production technology of stainless steel seamless pipes in our country.

[0003] my country's stainless steel smelting process is backward. Not only does it not have the latest "three-step" smelting process equipment, but also uses electri...

Claims

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