Lost foam-graphite chilling-antigravity casting process for railway cast-steel wheels

A technology of anti-gravity casting and lost foam casting, which is applied in the manufacture of tools, casting molding equipment, casting molds, etc. It can solve the secondary oxidation of molten steel, the low recycling rate of water glass sand, and the impact of waste sand discharge on the surrounding ecological environment, etc. problems, to achieve the effect of reducing consumption and discharge of waste sand, and reducing the impact on the ecological environment

Inactive Publication Date: 2018-01-16
信阳同合车轮有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a lost foam graphite chilled anti-gravity casting process for railway cast steel wheels, which solves the problem of low recycling rate of water glass sand in the traditional railway cast steel wheel production process, and a large amount of waste sand discharge affects the surrounding ecological environment and bottom. Secondary oxidation of molten steel caused by ladle pouring

Method used

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  • Lost foam-graphite chilling-antigravity casting process for railway cast-steel wheels

Examples

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specific Embodiment 1

[0016] The lost foam graphite chilled anti-gravity casting process for railway cast steel wheels combines the advantages of lost foam casting technology, graphite chilled process and anti-gravity casting technology. In the sand box 7, the molded riser foam pattern 2, the wheel foam pattern 5 and the assembly of the inner runner 6, the pouring tube 9, the plug head 4 and the plug rod 1 are bonded together, and then placed on the graphite ring 8 and fill dry sand 3 into the lost foam casting sand box 7, after vibration, connect the negative pressure system, place the sand box on the top of the prepared pressure tank cover 11, and assemble it on the pressure tank cover 11 The riser pipe 12 communicates with the pouring pipe 9, and a ladle 13 is placed in the pressure tank body 14, and the riser pipe 12 is inserted into the ladle 13, and air or inert gas is pressed into the pressure tank to cast the wheels.

[0017] In this example, in figure 1 Among them, the thread roots at bot...

specific Embodiment 2

[0018] This embodiment is further described on the basis of specific embodiment 1. The graphite ring 8 is located on the outer surface of the corresponding wheel rim, and the formed riser foam pattern 2 is distributed above the wheel hub, and the formed wheel foam pattern 5 is designed in the hub hole. It is in the shape of a through hole to reduce the machining allowance of the axle hole of the wheel blank. The assembly of the plug head 4 and the plug rod 1 is fixed at the center of the hub hole through the inner runner 6, and the pouring tube 9 is also located at the center of the hub hole.

specific Embodiment 3

[0019] This embodiment is based on specific embodiment 1 to further illustrate the pouring process. Air or inert gas is pressed into the pressure tank, and the molten steel in the ladle 13 flows along the riser pipe 12, The pouring pipe 9 and the inner runner 6 are injected, the wheel foam pattern 5 and the riser foam pattern 2 are gasified after meeting molten steel, the gas is sucked away by the vacuum pump connected to the lost foam casting sand box 7, and the molten steel replaces the space of the foam pattern, and the molten steel is When the mold is filled to the set riser height, take down the plug rod 1, the plug head 4 blocks the pouring pipe 9, the pressure tank is released, and the poured mold is removed. The molten steel in the riser continues to feed the wheel body. The wheel rim is rapidly solidified under the chilling effect of the graphite ring 8 to form a dense structure. At the same time, under the action of the riser, the sequential solidification from the ri...

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Abstract

The invention discloses a lost foam-graphite chilling-antigravity casting process for railway cast-steel wheels. The lost foam-graphite chilling-antigravity casting process integrates lost foam casting technology, graphite chilling casting technology and antigravity casting technology into one. According to the process, a graphite ring ready to mold is fixed in a lost foam casting sandbox via bolts; prepared and molded riser foam and wheel foam patterns are bonded with an assembly of an ingate, a casting pipe, a stopper plug and a stopper rod and are then put in the graphite ring; the lost foam casting sandbox is filled with dry sand and is then connected with a negative pressure device after vibration compaction; the sandbox is put on the top of the cover of a prepared pressure tank; a riser tube arranged on the cover of the pressure tank is communicated with the casting pipe; a steel ladle is arranged in the pressure tank; the riser tube is inserted into the steel ladle; air or inertgas is pressed in the pressure tank; and wheel casting is carried out. The lost foam-graphite chilling-antigravity casting process provided by the invention overcomes the problems of the low recoveryand utilization rate of sodium silicate sand in conventional production processes for railway cast-steel wheels, influence of high waste-sand discharge on surrounding ecological environment and secondary oxidation of molten steel caused by casting of bottom-pouring ladles.

Description

technical field [0001] The invention relates to the technical field of railway cast steel wheel production, in particular to a lost foam graphite chilled anti-gravity casting process for railway cast steel wheels. Background technique [0002] At present, domestically produced railway cast steel wheels all adopt the shape of graphite-type hanging sand lining and the technology of bottom pouring ladle pouring. The central riser is centrally fed, which can realize sequential solidification from the rim to the spoke plate and then to the hub, and the rim structure is dense. The technology is mature and the product quality is stable. However, the sand lining of the graphite type is sodium silicate sand, and the average consumption of quartz sand for a single wheel is about 90kg. According to the annual output of 250,000 wheels, the annual consumption of quartz sand is nearly 22,500 tons, and the volume is quite huge. In the long run, quartz sand is a non-renewable resource, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/28B22C9/04B22D15/00
Inventor 张思瑾王浩宋国祥杨召利罗广瑞梁超源时兴东
Owner 信阳同合车轮有限公司
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