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High-precision machining deformation control method for titanium alloy spherical shell

A technology of deformation control and titanium alloy, which is applied in metal processing, metal processing equipment, manufacturing tools, etc., can solve the problems of lower yield, difficult to meet, processing deformation, etc., to save processing costs, reduce difficulty and workload, The effect of solving the deformation problem

Inactive Publication Date: 2012-02-01
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such a machining process will deform the workpiece due to the residual stress during machining, and the elastic deformation of the workpiece caused by the turning tool pressing the workpiece during the cutting process will also lead to final machining deformation, making it difficult to meet the true sphericity and wall thickness difference, etc. Machining technology requirements, resulting in lower yield
According to statistics, according to traditional machining methods, the machining yield of such large-diameter and wall-thickness ratio workpieces is only about 65%.

Method used

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  • High-precision machining deformation control method for titanium alloy spherical shell
  • High-precision machining deformation control method for titanium alloy spherical shell

Examples

Experimental program
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Effect test

Embodiment 1

[0031] A titanium alloy spherical shell with an inner diameter of 600 mm and a wall thickness of 10 mm is machined with the material TC4 stamping part as a blank. The processing accuracy requires that the wall thickness difference is ±0.8m, and the overall roundness tolerance of the spherical shell shall not be greater than 0.5% of the nominal radius.

[0032] The machining scheme of the titanium alloy spherical shell is as follows:

[0033] 1. First, heat-treat the stamped spherical shell at a temperature of 950°C for 2 hours;

[0034] 2. Mark the blank of the stamping part and give the rough machining allowance;

[0035] 3. Roughly process the outer spherical surface first, and then weld the cylindrical clamping tool on the outer spherical surface after the outer spherical surface is processed in place. The diameter of the cylinder is 250mm and the length is 150mm;

[0036] 4. Rough machining of the inner spherical surface;

[0037] 5. Stress relief heat treatment, heat t...

Embodiment 2

[0045] The titanium alloy pressure-resistant spherical shell with an inner diameter of 500mm and a wall thickness of 9mm is machined with the material TC4 stamping parts as the blank. The machining scheme of the titanium alloy spherical shell is as follows:

[0046] 1. Mark the blank of the stamping part and give the rough machining allowance;

[0047] 2. Roughly process the outer spherical surface first, and then weld the cylindrical clamping tool on the outer spherical surface after the outer spherical surface is processed in place. The diameter of the cylinder is 280mm and the length is 170mm;

[0048] 3. Rough machining of the inner spherical surface, rough machining to the 2mm margin of the inner and outer spherical shells;

[0049] 4. Stress relief heat treatment, heat treatment temperature 650 ℃, time 3 hours;

[0050] 5. Semi-finishing, semi-finishing to a unilateral margin of 0.5mm, the tooling is the same as that of the rough machining inner spherical surface;

[...

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Abstract

The invention discloses a high-precision machining deformation control method for a titanium alloy spherical shell, which comprises the following steps of: performing rough machining, performing stress relief heat treatment for the first time, performing semi finish machining, performing stress relief heat treatment for the second time, and performing finish machining. During finish machining, a special anti-deformation tool is needed to be designed for the finish machining of a semispherical shell. By a processing technology of stage processing and repeated stress relief heat treatment, the problem that a titanium alloy is deformed in the machining forming process is well solved, yield is 100 percent, and quality meets a design requirement. The problem that a large-diameter thin-wall titanium alloy spherical shell is deformed in the machining process is solved, and production cost is saved; and a workpiece machined and formed by a forming method has ideal performance and size, the yield is 100 percent, and the method is suitable to be popularized to large-scale industrial production.

Description

technical field [0001] The invention relates to a non-ferrous metal processing technology, in particular to a high-precision machining deformation control method for a large-diameter and wall-thickness ratio titanium alloy spherical shell. [0002] Background technique [0003] Titanium alloy is a new type of structural material, which has excellent comprehensive properties, such as low density, high specific strength and specific fracture toughness, good fatigue strength and crack growth resistance, good low temperature toughness, and excellent corrosion resistance [1] . Therefore, it has been used more and more in industries such as aviation, aerospace, chemical industry and shipbuilding. The research and application of marine titanium alloys in my country began in the 1960s. Over the past few decades, a relatively complete series of marine titanium alloys has been formed, which can meet the requirements of different strength levels of surface ships, underwater submarine...

Claims

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Application Information

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IPC IPC(8): B23B5/00B23P25/00
Inventor 孙建刚吕逸帆杨瑞
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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