Titanium alloy thin-wall seamless lining straight cylinder section superplastic forming wall thickness uniformity control method

A superplastic forming and titanium alloy technology, applied in forming tools, manufacturing tools, metal processing equipment, etc., can solve problems such as failure to meet precision requirements, excessive wall thickness, and uneven distribution of wall thickness in the straight section of the lining, and achieve wall thickness Good control accuracy and stability, short forming time, and reduced mold cost

CN112974614AActive Publication Date: 2021-06-18AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2021-06-18

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Abstract

The invention discloses a titanium alloy thin-wall seamless lining straight cylinder section superplastic forming wall thickness uniformity control method, and belongs to the technical field of plastic processing. According to the method, a small-caliber lining spinning part with the variable wall thickness is adopted for conducting superplastic bulging, firstly, a thinning area is machined on a straight cylinder section of the lining spinning part, an original equal-thickness straight cylinder section is machined into a variable-wall-thickness pipe with the same annular direction and axial gradient distribution, and then superplastic bulging is conducted. According to the method of the invention, through the special wall thickness gradient design, the wall thickness distribution of the straight cylinder section of the bulged titanium alloy lining can be adjusted, a large-diameter lining blank with the thickness of the straight cylinder section being evenly distributed is obtained, the requirement for subsequent machining thinning wall thickness tolerance is met, meanwhile, control measures are taken for cooling of the lining blank, and the dimensional stability of the formed titanium alloy lining is ensured. The method is suitable for titanium alloy thin-wall seamless linings with various diameters, which are integrally formed by spinning / superplastic.
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Description

technical field

[0001] The invention belongs to the technical field of superplastic forming, and in particular relates to a preparation method of a novel titanium alloy thin-walled seamless lining. Background technique

[0002] As a key component of the pressurized delivery system of aerospace models such as launch vehicles, strategic / tactical missiles, and deep space probes, the titanium alloy lining for composite gas cylinders usually adopts the "forging + welding" method, but with the development of aerospace models, It cannot meet the requirements in terms of reliability, weight reduction and advancement, so a new process is urgently needed to realize the continuous integrated forming of titanium alloy lining to replace the current process route.

[0003] The titanium alloy lining precision spinning / superplastic forming integrated technology uses small-sized pipes as raw materials, and the two ends are closed and spun to form a weldless lining blank, and then superplasti...

Examples

Embodiment 1

[0065] A specific example is given below. In this example, the cylindrical inner lining is TC4 titanium alloy, with a volume of 12L and a length of 408mm. , the head is ellipsoidal, the semi-major axis of the inner surface of the head is 118mm, the semi-minor axis is 76mm, the semi-major axis of the outer surface of the head is 119.5mm, the semi-minor axis is 80mm, the length of the nozzle is 14mm, and the outer surface of the nozzle is 14mm. The circle is φ38mm, the inner hole of the nozzle is φ16mm, and the thickness of the R corner is ~9mm. The specific process is as follows:

[0066] (1) Mold design and manufacture: design according to the requirements of the product's external dimensions, and design symmetrically distributed upper and lower molds. The material is high-temperature-resistant cast steel Ni7N. After the upper and lower molds are closed, the diameter of the straight section of the inner surface is:

[0067] D=0.998×(236mm+1.2mm+3mm)≈239.7mm (0.998 is the diff...