Integral forming method for large aluminum alloy welding plate sealing head with uniform performance

An integral forming, aluminum alloy technology, applied in welding equipment, non-electric welding equipment, metal processing equipment, etc., can solve the problems of uneven distribution of wall thickness and mechanical properties, and achieve improved mechanical properties, uniform wall thickness, and uniform mechanical properties Effect

Active Publication Date: 2018-06-15
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of uneven distribution of wall thickness and mechanical properties of the aluminum alloy tailor welded blank head obtained by integral forming, and to provide a method for integrally forming a large aluminum alloy tailor welded blank head with uniform performance

Method used

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  • Integral forming method for large aluminum alloy welding plate sealing head with uniform performance
  • Integral forming method for large aluminum alloy welding plate sealing head with uniform performance
  • Integral forming method for large aluminum alloy welding plate sealing head with uniform performance

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specific Embodiment approach 1

[0020] Specific implementation mode one: combine Figures 1 to 4 , this embodiment is a method for integrally forming a large-scale aluminum alloy tailored welded blank head with uniform performance, which is completed according to the following steps:

[0021] 1. Friction stir welding: Large-scale aluminum alloy tailor welded blanks are prepared by adopting the friction stir welding method with a welding advance speed of 200 mm / min to 400 mm / min and a rotation speed of 800 rpm to 1000 rpm, and the width of the large aluminum alloy tailor welded blanks is ≥ 4000 mm ;

[0022] 2. Partial bulging: Local bulging of large aluminum alloy tailor-welded blanks is carried out by using a local pre-expansion mold, which includes a local bulging die 1, a pre-expansion die 2, and a liquid-filled chamber 3. 3 is provided with a cylindrical inner cavity 3-1, and the cylindrical inner cavity 3-1 of the liquid-filled chamber 3 communicates with the liquid medium cavity of the hydraulic syste...

specific Embodiment approach 2

[0026] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that in step 2, the inner diameter of the end of the large-scale aluminum alloy tailor welded blank head is set to be A, and the distance between adjacent welds on the large aluminum alloy tailor-welded blank is For B, when A-B>2500mm, two auxiliary cavities are stacked on both sides of the dome-shaped cavity 1-1 of the partial bulging mold 1, and the distance between the outer edges of the two auxiliary cavities is H≤Large aluminum alloy tailored welded blank The inner diameter of the end of the head is A, and the width of the weld platform between the dome-shaped cavity 1-1 and the auxiliary cavity is h, and the weld width of the large aluminum alloy tailored welded blank is b, then h≥2b; the large The aluminum alloy tailor welded blank is placed between the local bulging die 1 and the pre-expansion die 2 of the partial pre-expansion mold, and the weld of the large aluminum alloy...

specific Embodiment approach 3

[0027] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: in step 1, a large-scale aluminum alloy tailor welded blank is prepared by adopting a friction stir welding method with a welding advance speed of 200 mm / min and a rotation speed of 800 rpm. Others are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses an integral forming method for a large aluminum alloy welding plate sealing head with uniform performance, and relates to a forming method for the aluminum alloy welding platesealing head. The invention aims to solve the problem that an existing integrally formed aluminum alloy welding plate sealing head is not uniform in wall thickness and mechanical property distribution. The method comprises the following steps of: I, performing friction stir welding; II, locally expanding to obtain a prefabricated member; III, performing thermal treatment; IV, performing secondaryformation on a liquid-filling drawing mould to obtain a formed sealing head; and V, performing solid-solution treatment to obtain the large aluminum alloy welding plate sealing head. The formed aluminum alloy welding plate sealing head has the advantage of being uniform in wall thickness and mechanical property distribution, has thickness distribution difference smaller than or equal to 10%, and has strength distribution difference smaller than or equal to 30 MPa. The integral forming method is mainly used for integrally forming the large aluminum alloy welding plate sealing head with uniformperformance.

Description

technical field [0001] The invention relates to a forming method of an aluminum alloy tailor welded blank head. Background technique [0002] Heads are widely used in the manufacture of large containers in aerospace, petrochemical and other fields. Since the opening diameter is usually more than 2 meters, the current manufacturing method generally adopts multiple curved surface flaps assembled and then tailor-welded. As an important component of a large vessel, the head is subjected to complex loads such as internal pressure, vibration, and impact. Manufacturing standards require its organization and performance to be uniform, so as to meet the service performance requirements of large devices. However, the strength of traditional tailor-welded structure welds is only 70% of the base metal, and the plasticity is only 30% of the base metal, resulting in a decrease in the overall strength and toughness of the head, and large welding residual stress, which has become the main f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00B23K20/12
CPCB23K20/12B23P15/00
Inventor 刘伟徐永超苑世剑
Owner HARBIN INST OF TECH
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