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Isothermal Local Loading Forming Method for Complex Integral Members of Titanium Alloy Large Ribbed Plates

A technology of isothermal local loading and integral components, applied in the direction of metal processing equipment, etc., can solve the problems of reduced mechanical properties of components, high cost of formed components, low material utilization rate, etc., achieve small metal deformation resistance, improve filling performance, and reduce defects Effect

Inactive Publication Date: 2010-10-06
NORTHWESTERN POLYTECHNICAL UNIV +4
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AI Technical Summary

Problems solved by technology

[0004] In order to overcome the deficiencies of high forming component cost, low material utilization rate, long processing cycle, increased component weight, and reduced mechanical properties of components existing in the prior art, the present invention proposes an isothermal partial load forming method

Method used

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  • Isothermal Local Loading Forming Method for Complex Integral Members of Titanium Alloy Large Ribbed Plates

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preparation example Construction

[0026] Step 2. Preparation of preformed blank. The blank is heated and deformed in the two-phase region, and the alloy is heated to T β -40°C, use free forging and tire die forging to make billets.

[0027] Step 3, isothermal local loading forming. The forming process adopts the local forming method of the workpiece, and carries out isothermal local loading on an 8,000-ton hydraulic press. In order to ensure that the required load does not exceed the maximum tonnage of the equipment during the loading process, the workpiece is loaded in two areas. The total reduction is 30mm, and one loading pass is adopted, in which the loading deformation is 25mm, and the finishing deformation is 5mm. The preform is heated in a box-type resistance furnace to T β -15°C, and keep warm for 1.5h. The mold is heated to T β -40°C, and keep warm for 2h. The middle part of the workpiece is formed by the internal mold. During the forming, it is pressed down at a speed of 0.15 mm / s, and the amo...

Embodiment 2

[0033] In this embodiment, a steel company has 8,000 tons of hydraulic equipment in China, and the production outline size is 1.5×1.5m 2 , the TA15 titanium alloy integral stiffened plate member with a weight of 115 kg adopts an isothermal local loading mold consisting of an inner mold and an outer mold to form an upper mold. The local loading and forming of the forging is realized by controlling the movement of the outer mold and the inner mold. The specific process is :

[0034] Step 1, blank preparation. The selected bar is heated above the phase transition point, water-cooled and homogenized; the electroslag ingot is forged into an alloy billet with a height-to-diameter ratio of 2.4 to 2.7 by using the conventional upsetting method; the surface of the cylinder is polished, and the defect is localized polished.

[0035] Step 2, the preparation of the preformed blank. The blank is heated and deformed in the two-phase region, and the alloy is heated to T β -40°C, use free...

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Abstract

The invention relates to an isothermal local loading forming method for complex integral components such as large-scale ribbed plates of titanium alloys. An isothermal local loading mold consisting of an inner mold and an outer mold as an upper mold is adopted, and the local loading forming of forgings is realized by controlling the movement of the outer mold and the inner mold. During the loading and forming process, the workpiece can be divided into deformed area and undeformed area in each loading pass, and the tonnage required for the deformation of each partition does not exceed the maximum tonnage of the press used, and the weight of each module is also in the casting within tonnage. In each loading pass, local loading is carried out sequentially on different regions until the total deformation is reached. The invention realizes the overall forming of large and complex titanium alloy components, eliminates welds, improves the reliability of the components, and the metal filling performance and mechanical properties of the formed workpiece are good, avoiding the problems that the large superalloy mold cannot be cast at one time and the quality cannot be guaranteed , Partially loaded sub-modules are separated on the ribs, which reduces defects in the transition zone and leaves burrs on the ribs for subsequent cleaning.

Description

1. Technical field [0001] The invention belongs to the field of thermal processing, and relates to thermal processing and forging of difficult-to-deform alloys, in particular to an isothermal local loading forming method for complex integral components such as titanium alloy large-scale rib plates. 2. Background technology [0002] With the rapid development of aviation, aerospace and high-tech industries, a large number of titanium alloy large-scale ribs with significant structural benefits are used in advanced fighter jets and transport aircraft to reduce weight coefficients and improve combat capabilities, especially for new-generation aircraft. For example, titanium alloy bulkheads, which are widely used in aircraft as load-bearing parts, are often high-reinforced, thin-belted, and have bosses. The maximum external dimension reaches 1.5m, and the projected area is nearly 1.7m 2 , the projected area of ​​the frame of the new generation aircraft will reach 4m 2 . These ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21J5/02B21J5/00C22F1/18
Inventor 孙志超杨合李志燕周建华苑世剑王晓英周义刚阮立新王向明吴跃江张磊
Owner NORTHWESTERN POLYTECHNICAL UNIV
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