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A kind of processing method of the workpiece of retracting and expanding pipe section

A processing method and workpiece technology, which are applied in the field of processing workpieces in a pipe-retracting and expanding section, can solve the problems of difficulty in assembling the primary parts of an outer cylinder and an inner cylinder, cannot guarantee the machining accuracy, and the volume of the pipe-receiving and expanding section is large and difficult to process. Effects of Feasibility and Assembly Accuracy

Active Publication Date: 2022-07-26
XIAN YUANHANG VACUUM BRAZING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a processing method for the shrinkage and expansion pipe section workpiece, which solves the problems that the shrinkage and expansion pipe section is difficult to process due to its large volume, and the difficulty in assembling the initial parts of the outer cylinder and the inner cylinder, so that the processing accuracy cannot be guaranteed.

Method used

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  • A kind of processing method of the workpiece of retracting and expanding pipe section
  • A kind of processing method of the workpiece of retracting and expanding pipe section
  • A kind of processing method of the workpiece of retracting and expanding pipe section

Examples

Experimental program
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Effect test

Embodiment 1

[0054]A processing method for retracting and expanding a pipe section workpiece, comprising the following steps:

[0055] A1. Roughly machine a ring groove on the outer surface of the first prefabricated part made of 06Cr19Ni10 to ensure the annular ridges formed at both ends of the ring groove, and ensure that the size of the annular ridges is the same as the thickness of the inlet flange and the outlet flange, which is convenient for import Flange and outlet flange assembly; CNC lathe is used to finish machining the first curved surface composed of the arc-shaped tapered surface and the arc-shaped tapered surface inside the first prefab, and then finish the first curved surface. get as figure 1 The outer cylinder shown; specifically, after processing, ensure that the diameter of the outer cylinder is 620 mm, the length is 1230 mm, and the weight is about 2.5t; lobe, and milling the split face;

[0056] A2. A second curved surface that fits the first curved surface is finis...

Embodiment 2

[0070] On the basis of Example 1, vacuum brazing can also be performed by the following steps:

[0071] Vacuuming: cold vacuuming, so that the pressure in the furnace reaches 1x10 -2 Pa or more;

[0072] Heating and heating: Heating to 300-400°C at a rate of 30-40°C / h and holding for 100min;

[0073] Heating to 800-870°C at a rate of 20-30°C / h and holding for 1200min;

[0074] Heating to 1020°C-1030°C at a rate of 50-60°C / h;

[0075] Vacuum brazing: brazing at 1020-1030℃, partial pressure 3Pa, keep for 240min;

[0076] Cooling out of the furnace: cooling to 600 °C at a temperature of 60 °C / h, vacuum cooling to 200 °C and filling with high-purity gas, so that the pressure in the furnace reaches 9x10 4 Pa, cooled to 50-60 ℃ with the furnace, and released.

[0077] The workpiece of the retracted and expanded section processed under the above steps can bear a pressure of 5MPa, which meets the pressure requirements of the workpiece.

Embodiment 3

[0079] On the basis of Example 1, vacuum brazing can also be performed by the following steps:

[0080] Vacuuming: cold vacuuming, so that the pressure in the furnace reaches 1x10 -2 Pa or more;

[0081] Heating and heating: Heating to 400-500°C at a rate of 50-60°C / h for 100min;

[0082] Heating to 900-950°C at a rate of 40-50°C / h and holding for 1200min;

[0083] Heating to 1040°C-1050°C at a rate of 90-100°C / h;

[0084] Vacuum brazing: brazing at 1040-1050℃, partial pressure 3Pa, keep for 240min;

[0085] Cooling out of the furnace: cooling to 600 °C at a temperature of 60 °C / h, vacuum cooling to 200 °C and filling with high-purity gas, so that the pressure in the furnace reaches 9x10 4 Pa, with the furnace cooled to 70-80 ℃, out of the furnace.

[0086] The workpiece of the retracted and expanded section processed under the above steps can bear a pressure of 5MPa, which meets the pressure requirements of the workpiece.

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Abstract

The invention relates to the field of precision workpiece processing, and discloses a processing method for retracting and expanding a pipe section workpiece. The outer cylinder is equally divided into three parts; A2. A second curved surface is machined on the outer surface of the second prefab, a third curved surface is machined inside, and fixed positions are reserved at both ends; a plurality of grooves are machined on the second curved surface A3. The lower end face of the third preform is machined to match the second curved surface, and the upper end face is machined to match the outer The outer surface of the cylinder has the same structure, and the front and rear surfaces are processed with solder grooves to obtain reinforcement blocks; A4. Assemble the three-lobed outer cylinder and inner cylinder preliminary parts, and assemble the reinforcement blocks in the assembly gap to obtain the preliminary workpieces; A5. Vacuum brazing the primary workpiece; A6. Assemble flanges and water jacket ring plates on both sides of the outer cylinder after being released from the furnace; process the third curved surface;

Description

technical field [0001] The present invention relates to the technical field of precision workpiece processing, in particular to a processing method for retracting and expanding a pipe section workpiece. Background technique [0002] The expansion section is an important part of the high temperature and high pressure components of the supersonic test bench test equipment, which includes a special-shaped inner cylinder, a special-shaped outer cylinder, and the inlet and outlet flanges connected to it. [0003] There are the following difficulties and problems in the processing of the retracted and expanded section: the overall volume is large, and it is not easy to assemble the outer cylinder and the inner cylinder; the outer cylinder has a large shape and cannot be installed on the tooling table for cutting; It is complex and has 100 thin-walled prefabricated channels with different widths. It requires high precision, is not easy to process, and the surface of the inner cylin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 任耀文刘洋任军李淑芳王程成李俊峰王伟
Owner XIAN YUANHANG VACUUM BRAZING TECH
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