Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Subway internal steel frame casting and production technology thereof

A production process and casting technology, which is applied in the field of steel frame castings in subways and its production process, can solve the problems of small difference in strength, high acceptance standards, insufficient pouring, etc., and achieve the effect of reducing hot spots

Active Publication Date: 2015-12-16
HUZHOU ZHONGLIAN MACHINERY EQUIP
View PDF8 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the processing of steel frame castings used in subways has the following difficulties: 1. Compared with domestic 20SiMn, the material has a lower Si content, and the strength is not much different, but the plasticity is higher, mainly because the S and P requirements are low and difficult to control; 2. The structure is complex ;3. Thin-skinned box-shaped structure is the most difficult to produce in the foundry industry and is prone to insufficient pouring and cracks. For example, the thickness of No. 1 piece is 30mm and the length is nearly 6 meters. The pouring temperature of molten steel should not be high or low. , if it is low, there will be insufficient pouring; 3. The acceptance standard is high

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Subway internal steel frame casting and production technology thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Process parameters: the shrinkage rate is all 2%.

[0038] Parting surface: The upper and lower parts are divided into symmetrical points, which is conducive to mold taking and convenient modeling. However, due to the reduced strength of the thin-walled model, it is not conducive to mass production, so the model with a bottom plate is adopted.

[0039] Gating system: The cross-section of the inner runner is smaller than the cross-sectional area of ​​the casting. Enter from both ends of the mold, the number is 6, and there is no inner nozzle in the middle section.

[0040] Riser setting: the middle riser is the main riser, and the upper half of the hole is injected to increase the feeding capacity of the hot joint of the web. The air outlet riser is set on the rib plate, and the auxiliary rib plate is solidified at the same time. A number of small risers are placed at the hot joint of the crosshead. Ensure that each small hot spot is cast densely.

[0041] Anti-crack...

Embodiment 2

[0049] Process parameters: The shrinkage rate of the longer beam is 1.8% in the length direction, and the remaining 2%. All other accessories are 2%.

[0050] Parting surface: The upper and lower parts are divided into symmetrical points, which is conducive to mold taking and convenient modeling. However, due to the reduced strength of the thin-walled model, it is not conducive to mass production, so the model with a bottom plate is adopted.

[0051] Gating system: The cross-section of the inner runner is smaller than the cross-sectional area of ​​the casting. Enter from both ends of the mold, the number is 6, and there is no inner nozzle in the middle section.

[0052] Riser setting: the middle riser is the main riser, and the upper half of the hole is injected to increase the feeding capacity of the hot joint of the web. The air outlet riser is set on the rib plate, and the auxiliary rib plate is solidified at the same time. A number of small risers are placed at the hot ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
elongationaaaaaaaaaa
Login to View More

Abstract

The invention relates to a subway internal steel frame casting and a production technology thereof. The production technology comprises the following steps: parting up and down by a symmetric point, adopting a gating system to enter from two ends of a casting mould so as to pour six pouring gates, and not arranging a flow gate in the middle section, wherein the cross section of a pouring ingate is smaller than that of the casting; arranging a plurality of risers, wherein the middle riser is a main riser, pouring from the first half part of a hole to increase the feeding capacity to a center plate thermal center, and arranging a riser runner in a rib plate; adopting an electric-arc furnace to smelt steel, adding aluminum, rare earth and silicozirconium alloy for forcible deoxidizing, blowing argon on a steel ladle, boiling the molten steel surface on the steel ladle, keeping for a few minutes, purifying to remove impurities, and moulding; controlling the pouring temperature to be within the range of from being equal to or smaller than 1560 to 1570 DEG C to ensure high-quality molten steel pouring, adopting ferrochromium resin sand for foundry sand, ensuring the heat preservation time equal to or greater than 24 hours, adopting an external iron chill auxiliary riser to realize progressive solidification, and after sand shakeout, cutting the riser, and feeding the casting in a furnace for thermal treatment; finally, finishing the casting subjected to the thermal treatment.

Description

technical field [0001] The invention relates to the technical field of metal casting, and more specifically relates to a steel frame casting in a subway and a production process thereof. Background technique [0002] With the development of space structure, the span of the structure is getting bigger and bigger. In the field of construction engineering, new technologies and materials have emerged in large numbers, and the structural forms have also increased accordingly. The connection methods of steel structures are becoming more and more complex, and the traditional joint types such as welded ball joints and steel pipe intersecting joints cannot fully adapt to the development of current steel structures. The quality of the joint structure has a considerable impact on the way of force transmission, fabrication and installation, and project cost of the structure. Therefore, it is in front of the structural designers to find a joint type with reasonable force, simple construc...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/20B22C9/08C22C38/44C22C38/22C22C38/12C22C38/08C22C38/04
Inventor 陈国祥王建国谈永庆李东谢溢鸣
Owner HUZHOU ZHONGLIAN MACHINERY EQUIP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com