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Extrusion moulding method of pure platinum cupped utensil

A technology of extrusion forming and cupping, which is applied in the field of metal plastic forming, can solve the problems of reducing the overall corrosion resistance of cup-shaped parts, unfavorable use of cup-shaped parts, and large differences in plate structure, so as to facilitate the organization of continuous production, The effect of shortening the production cycle and high material utilization

Inactive Publication Date: 2015-10-14
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the seamless cylinder wall is processed, the bottom and side walls still need to be welded by argon arc welding. The defect is that the structure of the weld seam and the heat-affected zone of welding is quite different from that of the plate, which reduces the hardness of the cup. overall corrosion resistance
When the material of the cup-shaped piece is Pt, the disadvantages of the welding process scheme are: 1. The welding performance of Pt is not good, and many welding methods cannot be used for the welding of Pt; The performance is quite different from that of other parts of the cup, which is not conducive to the actual use of the cup

Method used

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  • Extrusion moulding method of pure platinum cupped utensil
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  • Extrusion moulding method of pure platinum cupped utensil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Such as figure 1 As shown, this embodiment includes the following steps:

[0031] 1. Billet making, the pure platinum billet with hollow structure is obtained through casting process, and then annealed.

[0032] 2. The surface is copper-plated, and a layer of 10μm copper coating is plated on the surface of the hollow blank by electroplating. The specific parameters related to the electroplating process are: main salt concentration 60g / L, current density 20A / dm 2 , the temperature of the electroplating solution is 30°C, and the electroplating time is 20min.

[0033] 3. Forward and reverse compound extrusion, at room temperature, using a punch with a mandrel and a cup-shaped die for extrusion, the downward speed of the punch during extrusion is 10mm / s; during the extrusion process, a part of the billet is directed downward Extrude to form the lower end stem of the cup-shaped vessel, and another part of the blank is extruded upward and reversely to form the upper cup of ...

Embodiment 2

[0041] Such as figure 1 As shown, this embodiment includes the following steps:

[0042] 1. Billet making, the pure platinum billet with hollow structure is obtained through casting process, and then annealed.

[0043] 2. The surface is copper-plated, and a layer of 20μm copper coating is plated on the surface of the hollow blank by electroplating. The specific electroplating process parameters are: main salt concentration 60g / L, current density 20A / dm 2 , the temperature of the electroplating solution is 50°C, and the electroplating time is 40min.

[0044] 3. Forward and reverse compound extrusion, at room temperature, using a punch with a mandrel and a cup-shaped die for extrusion, the downward speed of the punch during extrusion is 20mm / s; during the extrusion process, a part of the billet is directed downward Extrude to form the lower stem of the cup-shaped vessel, and another part of the blank is extruded upwards and reversely to form the upper cup of the cup-shaped ves...

Embodiment 3

[0050] Such as figure 1 As shown, this embodiment includes the following steps:

[0051] 1. Billet making, using recycled cup-shaped vessels as raw materials, obtaining pure platinum blanks with hollow structures through casting processes, and annealing them.

[0052]2. The surface is copper-plated, and a layer of 12 μm copper coating is plated on the surface of the hollow blank by electroplating. The specific electroplating process parameters are: main salt concentration 60g / L, current density 20A / dm 2 , the temperature of the electroplating solution is 40°C, and the electroplating time is 25min.

[0053] 3. Forward and reverse compound extrusion, at room temperature, using a punch with a mandrel and a cup-shaped die for extrusion, the downward speed of the punch during extrusion is 15mm / s; during the extrusion process, a part of the billet is directed downward Extrude to form the lower end stem of the cup-shaped vessel, and another part of the blank is extruded upwards and...

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Abstract

The invention belongs to the field of metal plastic forming, and discloses an extrusion moulding method of a pure platinum cupped utensil. The surface of a pure platinum blank is plated with copper so as to improve the malleability and self-lubrication of platinum materials, and then one-time forming is achieved through front-back combined extrusion. The copper on the surface is removed through acid pickling. The pure platinum cupped utensil is obtained through stress relief annealing treatment after cleaning. According to the extrusion moulding method, it can be guaranteed that the cupped utensil free of a weld joint is obtained, the user performance of the cupped utensil is improved, and the defect of weld joint leakage is thoroughly overcome. The utilization rate of the materials is high, and continuous production can be organized conveniently; the production period can be shortened, production efficiency can be improved, and production cost can be lowered.

Description

technical field [0001] The invention relates to a technique in the field of metal plastic forming, in particular to a pure platinum cup-shaped vessel extrusion forming method. Background technique [0002] In practice, there is a class of chemical utensils that need to work at high temperatures, and the working temperature exceeds 1000°C. At this time, platinum is required as the material. Platinum materials have natural characteristics of high temperature resistance and corrosion resistance. For the manufacture of this kind of chemical utensils, platinum sheets can be used at present, which are rolled and welded into shape. However, during actual smelting, this kind of vessel is likely to cause the raw liquid to leak from the weld at high temperature, which will affect the quality of the chemical reaction, cause the product to fail, and fail to meet the use requirements. In addition, because platinum metal is a precious metal, the method of cutting is generally not used, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C23/03
Inventor 胡成亮殷强赵震
Owner SHANGHAI JIAO TONG UNIV
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