Super plastic forming method for plate type heat converter special titanium plate

A plate heat exchanger and superplastic technology, applied in heat treatment furnaces, heat treatment equipment, heat treatment process control, etc., can solve problems such as unfavorable processing of various types of products, complicated steps, etc., to achieve small temperature errors and reduce impurity content , the effect of reducing the inspiratory volume

Inactive Publication Date: 2008-02-13
上海桦厦实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology is not easy to draw and deform tubular materials from the inside to the outside, and uses high-temperature water to generate greater pressure to cause deep-drawing deformation. However, a production line can only process a single part, and each part needs to be processed. Water filling, sealing, heating, deformation, cooling, and disassembly can only be completed, and the steps are complicated
When encountering products with different calibers, it is necessary to redesign the jacket and sealing device to ensure its tightness, which is not conducive to processing various types of products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0030] 1. Titanium sponge is used as the smelting raw material;

[0031] Its mass percentages are: oxygen = 0.05%, iron = 0.05%, nitrogen = 0.01%, carbon = 0.015%, hydrogen = 0.005%, other impurities nickel, silicon, aluminum, vanadium, zinc, molybdenum, zirconium content 0.39%, The balance is titanium, HB=100.

[0032] 2. Vacuum plasma beam melting furnace is directly cast into slabs after melting.

[0033] Slab specification: H×B×L=220mm×900mm×1000mm.

[0034] 3. Heat to 900°C in a heating furnace, and then roll it into a plate with a thickness of 8 mm.

[0035] 4. After acid-alkali washing and grinding, the 8mm-thick plate is heated to 820°C in a heating furnace, and hot-rolled to a 2.0mm-thick plate.

[0036] 5. The 2.0mm thick plate is annealed in a vacuum furnace after acid and alkali washing and grinding. Annealing specification: 710°C, 2h.

[0037] 6. After annealing in a vacuum furnace, the 2.0mm thick plate is cold rolled to a 1.0mm plate.

[0038] 7. After the...

example 2

[0044] 1. Titanium sponge is used as the smelting raw material;

[0045] Its mass percentages are: oxygen = 0.08%, iron = 0.08%, nitrogen = 0.008%, carbon = 0.03%, hydrogen = 0.007%, other impurities nickel, silicon, aluminum, vanadium, zinc, molybdenum, zirconium content 0.39%, The balance is titanium. HB=110.

[0046] 2. Vacuum plasma beam melting furnace is directly cast into slabs after melting.

[0047] Slab specification: H×B×L=240mm×900mm×1000mm.

[0048] 3. Heat to 920°C in a heating furnace, and then roll it into a plate with a thickness of 9 mm.

[0049] 4. After acid-alkali washing and grinding, the 9mm-thick plate is heated to 830°C in a heating furnace, and hot-rolled to a 2.3mm-thick plate.

[0050] 5. The 2.3mm thick plate is annealed in a vacuum furnace after acid and alkali washing and grinding, annealing: 720°C, 2h.

[0051] 6. After annealing in a vacuum furnace, the 2.3mm thick plate is cold rolled to a 1.2mm plate.

[0052] 7. After the 1.2mm plate i...

example 3

[0058] 1. Titanium sponge is used as the smelting raw material;

[0059] Its mass percentages are: oxygen = 0.07%, iron = 0.06%, nitrogen = 0.009%, carbon = 0.02%, hydrogen = 0.006%, other impurities nickel, silicon, aluminum, vanadium, zinc, molybdenum, zirconium content 0.39%, The balance is titanium. HB=105.

[0060] 2. Vacuum plasma beam melting furnace is directly cast into slabs after melting.

[0061] Slab specification: H×B×L=200mm×900mm×1000mm.

[0062] 3. Heat to 900°C in a heating furnace, and then roll it into a plate with a thickness of 8 mm.

[0063] 4. After acid-alkali washing and grinding, the 8mm thick plate is heated to 800°C in a heating furnace, and hot rolled to a 2.0mm thick plate.

[0064] 5. The 2.0mm thick plate is annealed in a vacuum furnace after acid and alkali washing and grinding. Annealing: 700°C, 2h.

[0065] 6. After annealing in a vacuum furnace, the 2.0mm thick plate is cold rolled to a 1.0mm plate.

[0066] 7. After the 1.0mm plate ...

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Abstract

The present invention relates to a superplastic forming method for the titanium plate specially used for the plate type heat exchanger, which belongs to the field of mechanical processing technology. The present invention comprises the following steps that spongy titanium is chosen to be the melted raw material; the spongy titanium is placed in a vacuum plasma smelting furnace to be directly cast into plate base; the plate base forms a plate of a thickness of 2.0 to 2.4 mm after the process of heating, hot rolling, acid and alkali washing; second heating, hot rolling and acid and alkali washing and annealing; the plate of a thickness of 2.0 to 2.4 mm after the annealing in the vacuum smelting furnace forms a titanium plate of a thickness of 0.5 to 0.6 mm after the process of cold rolling, cleaning, second annealing and cold rolling, acid and alkali washing and third annealing. The present invention adopts the process that the spongy titanium which contains oxygen, iron and nitrogen of comparatively high content is directly processed into the titanium plate base in the plasma smelting furnace and directly rolled into the plate without forging and pressing.

Description

technical field [0001] The invention relates to a method in the technical field of mechanical processing, in particular to a method for superplastic forming of a special titanium plate for a plate heat exchanger. Background technique [0002] Currently, superplastic forming of titanium alloys is a globally recognized standard industrial technique. Superplasticity refers to the ability of metal materials to produce extremely large plastic strain without macroscopic necking at a reasonable (high) forming temperature and (small) strain rate. Superplasticity has the following requirements: the deformation temperature should reach the melting temperature about half of ; the deformation rate must be low. Superplastic forming is to use the phenomenon that the material has a large plastic strain capacity under certain conditions to process and deform the material. For the titanium plate slab with grade GR1, its plasticity is only 40-50% at room temperature, but when the temperatur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/46B21B37/16C22C14/00C21D9/70C21D11/00C21D9/46C21D1/26C23G1/00
Inventor 林健李涛袁秦峰
Owner 上海桦厦实业有限公司
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