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A Whole Precision Machining Method for Thin-walled Slender Pipe Fittings

A technology for precision machining and slender tubes, which is applied in the field of overall precision machining of thin-walled slender tubes, and can solve problems such as deformation control, weak rigid parts, and precision machining

Inactive Publication Date: 2022-01-18
SHANGHAI SPACE PRECISION MACHINERY RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide an overall precision machining method for thin-walled slender pipe fittings, which can solve the deformation control of weakly rigid parts and the precision machining of deep and long holes from the aspects of process flow design, clamping method design, machining tool optimization, and machining allowance control. , Thin-wall tolerance size control and other issues

Method used

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  • A Whole Precision Machining Method for Thin-walled Slender Pipe Fittings
  • A Whole Precision Machining Method for Thin-walled Slender Pipe Fittings
  • A Whole Precision Machining Method for Thin-walled Slender Pipe Fittings

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Embodiment

[0058] In the embodiment of the present invention, the inner diameter of the thin-walled slender tube is Φ23.8+0.050mm, the outer diameter is Φ24.4mm, the wall thickness is 0.3+0.030mm, the length is 575.5+0.050mm, the straightness of the outer circle is 0.025mm, and the inner and outer circles are coaxial The degree is 0.025mm, and the perpendicularity between the two ends of the surface and the axis of the inner circle is 0.05mm. The material of the parts is austenitic stainless steel. It is required that the inner and outer surfaces must not have defects such as nicks, scratches, and pits, and splicing is not allowed. The specific process is as follows:

[0059] 1) Cutting

[0060] The blank material is a bar with a diameter of Φ35mm and a length of 605mm.

[0061] 2) heat treatment

[0062] Solution heat treatment temperature 1050℃±10℃, holding time 1h, water cooling.

[0063] 3) Rough turning end face and outer circle

[0064] ①Roughly turn both ends of the surface to...

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Abstract

The invention provides a thin-walled slender pipe integral precision machining method, comprising the following steps: S1, blanking; S2, thermal processing; S3, rough turning end face and outer circle; S4, drilling and boring the inner hole; S5, honing the inner hole Hole; S6, semi-finished turning, finishing outer circle; S7, fine grinding outer circle; S8, micro-extrusion correction; S9, finish turning end face; S10, inspection and packaging. The invention can realize the overall precision machining of thin-walled elongated pipe fittings made of austenitic stainless steel, with a maximum length of 575mm, a minimum pipe diameter of 24mm, a maximum length-to-diameter ratio of 24, and a thinnest wall thickness of 0.3mm. The axiality reaches 0.025mm, the straightness reaches 0.025mm, and the surface roughness reaches Ra0.8. It is an efficient, precise and low-cost processing method for thin-walled slender pipe fittings.

Description

technical field [0001] The invention relates to the technical field of mechanical manufacturing, in particular to an integral precision machining method for thin-walled elongated pipe fittings. Background technique [0002] Due to the large length-to-diameter ratio, thin-walled and slender tube parts are typical weakly rigid parts, which are easy to deform and produce cutting chatter during processing, and it is difficult to control the machining dimensional accuracy and straightness index; the inner hole of the slender tube is a deep long hole, and the processing space Due to the limitation, the traditional drilling method is used for cooling and lubrication, chip removal and chip breaking are difficult, and heat is easy to accumulate, so the tool wears violently, and the high temperature causes thermal expansion and deformation of the parts, which affects the machining dimensional accuracy; in addition, the existence of thin-walled features further reduces the The rigidity...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 郭国强陈明程海林俞玉明安庆龙金路明伟伟
Owner SHANGHAI SPACE PRECISION MACHINERY RES INST
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