Elliptical arc plus circular arc head and molding die of elliptical arc plus circular arc head

A technology of forming molds and elliptical arcs, which is applied to forming tools, manufacturing tools, metal processing equipment, etc., can solve the problems of inconvenient manufacturing and high consumption of materials, and achieve the effect of good stress state and less material.

Active Publication Date: 2018-12-28
张阳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] It consumes more materials; it is not convenient to manufacture, especially for larger diameter heads

Method used

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  • Elliptical arc plus circular arc head and molding die of elliptical arc plus circular arc head
  • Elliptical arc plus circular arc head and molding die of elliptical arc plus circular arc head

Examples

Experimental program
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Effect test

Embodiment 1

[0040] This embodiment provides an elliptical arc plus circular arc type head. The inner surface of the elliptical arc plus circular arc type head is regarded as the middle surface, and the middle surface is formed by rotating the meridian with the preset axis Y as the rotation axis. The meridian includes The transition section is an elliptical arc section and the middle section is a circular arc section, and the elliptical arc section and the circular arc section have a smooth transition. That is, the normal or tangent of the intersection point at the intersection of the two arcs coincides. In production practice, the difference between the inner surface and the middle surface of the head is generally ignored. Compared with the common standard oval head (referred to as the standard oval head) and the standard disc-shaped head (referred to as the standard disc head), this kind of elliptical arc and arc-shaped head has a better stress state. Consumes less material and is more ...

example 1

[0062] Example 1 Design condition: P c =0.9MPa, t=-196°C, D i =2100mm,

[0063] [σ] t =137Mpa, φ=1.0, material S30408, the δ of the standard oval head is 6.9mm, and the δ of the elliptical arc plus arc type head is 6.2mm. If the thickness addition is 0.8mm, the nominal thickness is 8mm, so the blanking thickness can be 10mm and 8mm respectively, and the minimum thickness after forming is 6.9mm and 6.2mm respectively. Their masses are 395.1Kg and 315.3Kg respectively. The latter accounts for about 80% of the former.

example 2

[0064] Example 2 Design condition: P c =1.6MPa, t=50℃, D i =3400mm, [σ] t =185Mpa, φ=1.0, material Q345R, then the δ of the standard elliptical head is 14.7mm, and the δ of the elliptical arc plus arc type head is 13.3mm. If the thickness addition is 2.3mm, the nominal thicknesses are 18mm and 16mm respectively, so the blanking thicknesses can be 20mm and 18mm respectively, and the minimum thicknesses after forming are 16.2mm and 14.8mm respectively. Their masses are 1996.1Kg and 1793.9Kg respectively. The latter accounts for about 90% of the former.

[0065] Example 3 Design condition: P c =2.8MPa, t=80℃, D i =2200mm, [σ] t =137Mpa, φ=1.0, material S30408, the δ of the standard elliptical head is 22.6mm, and the δ of the elliptical arc plus arc type head is 20.3mm. If the thickness addition is 0.8mm, the nominal thicknesses are 24mm and 22mm respectively, so the blanking thicknesses can be 26mm and 24mm respectively, and the minimum thicknesses after forming are 22.6mm...

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Abstract

The invention provides a forming die of an elliptical arc plus circular arc type head and an elliptical arc plus circular arc type head, which relates to the technical field of a pressure vessel head.The middle surface of the elliptical arc plus circular arc type head is formed by rotating the warp line with the preset axis Y as the rotation axis, and the warp line comprises an elliptical arc section of the transition section and an arc section of the middle section, and the smooth transition between the elliptical arc section and the arc section is that the normal or tangent line of the intersection point of the two arcs coincides. The forming die of elliptical arc plus circular arc head is used to make elliptical arc plus circular arc head. Compared with the standard elliptical head andthe standard disc head, the elliptical head and the circular head have better stress state, consume less material, and are more convenient for material preparation because they can be blanked with the same thickness as the barrel. At the same time, the arc head and the molding die can not be limited to stamping as the standard ellipsoidal head, but can only perform spinning or sectioning to forma poor mechanical properties of the standard disc head to replace.

Description

technical field [0001] The invention relates to the technical field of pressure vessel heads, in particular to an elliptical-arc-plus-arc-shaped head and a molding die for an ellipse-arc-plus-arc-shaped head. Background technique [0002] The head refers to the component used to close the end of the container to isolate the internal and external media, also known as the end cap. The heads of cylindrical containers are generally rotary shells. According to the shape of the head surface, it can be divided into convex shape, conical shape, flat shape and combined shape. Convex heads refer to heads whose outer surface is convex, such as hemispherical, elliptical, dish-shaped and non-frilled spherical heads. [0003] As we all know, the standard elliptical head of a pressure vessel cannot be formed by spinning, and can only be replaced by a disc-shaped head with poor mechanical properties R=0.9D, r=0.17D, that is, a standard disc head, where D is the head or cylinder body diam...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50F17C13/06B21D37/10
CPCF17C13/06B21D37/10G06F30/17G06F30/23
Inventor 李业勤涂善东王宁苏文献凌一玮张阳张玉玲傅卫国王健王涛
Owner 张阳
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