Expendable pattern graphite chilling gravity casting technology for railway cast steel wheels

A lost foam casting and gravity casting technology, applied in manufacturing tools, casting equipment, molds, etc., can solve the problems of waste sand discharge, low recycling rate of sodium silicate sand, affecting the surrounding ecological environment, etc., and reduce consumption. And the discharge of waste sand, the effect of good chilling effect and high thermal conductivity

Active Publication Date: 2018-01-12
信阳同合车轮有限公司
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  • Summary
  • Abstract
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  • 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 gravity casting process for railway cast steel wheels, which solves the problems of low water glass sand recovery and utilization rate in the traditional railway cast steel wheel production process, and the problem that a large amount of waste sand discharge affects the surrounding ecological environment

Method used

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  • Expendable pattern graphite chilling gravity casting technology for railway cast steel wheels

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0015] like figure 1 As shown, a lost foam graphite chilled gravity casting process for railway cast steel wheels combines the advantages of lost foam casting technology and graphite chilled process, and the graphite ring 4 that is ready to be formed is fixed on the lost foam casting sand by bolts 3 In the box 6, the molded pouring riser foam pattern 1 and the wheel foam pattern 2 are bonded and placed in the graphite ring 4, and dry sand 5 is filled into the lost foam casting sand box 6. Under a certain negative pressure state, the wheel is poured out with a bottom casting ladle.

[0016] In this example, in figure 1 Among them, the thread roots at both ends of the bolt 3 are provided with positioning bosses, and the two ends of the bolt 3 are respectively connected with the graphite ring 4 and the lost foam casting sand box 6, and are supported and positioned by the positioning bosses at both ends to ensure that the graphite ring 4 The height from the bottom of the lost fo...

specific Embodiment 2

[0017] like figure 1 As shown, this embodiment is further described on the basis of specific embodiment 1. The graphite ring 4 is located on the outer side of the corresponding wheel rim, and the formed pouring riser foam pattern 1 is located at the center above the wheel hub. The formed wheel Foam pattern 2 hub hole is designed as a concave shape to reduce the machining allowance of the axle hole of the wheel blank.

specific Embodiment 3

[0018] This example further explains the pouring process on the basis of specific example 1. Bottom pouring ladle is used for pouring, molten steel is injected through the foam pattern 1 of the pouring riser, and the foam pattern 1 of the pouring riser and the foam pattern 2 of the wheel meet the molten steel. After gasification, the gas is sucked away by the vacuum pump connected to the lost foam casting sand box 6, and the molten steel replaces the space of the foam pattern. The wheel body is fed, and the rim of the wheel is rapidly solidified under the action of graphite ring chilling to form a dense structure. After the end, the sand box is depressurized, the box is turned over to shake off the sand, and the wheel is taken out. The waste sand is recycled online after magnetic separation, dust removal, and cooling. After the graphite ring 4 is forced to cool, it is also recycled online.

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Abstract

The invention discloses an expendable pattern graphite chilling gravity casting technology for railway cast steel wheels, and the expendable pattern graphite chilling gravity casting technology integrates an expendable pattern casting technology and a graphite chilling technology. A formed graphite ring is prepared and fixed in an expendable pattern casting sand box with bolts, and a formed casting head foam pattern and a wheel foam pattern are bonded, and then placed in the graphite ring; an expendable pattern casting sand box is filled with dry sand; through compaction by vibration, a wheelis formed by casting with a bottom pouring ladle under the set negative pressure; the problems of water glass sand regeneration and low recovery rate in the traditional casting technology for the railway cast steel wheels are solved, and the consumption of quartz sand and discharge of waste sand are reduced effectively; and the casting technology facilitates of controlling the wheel manufacturingcost and reducing the influence on ecological environment.

Description

technical field [0001] The invention relates to the technical field of railway cast steel wheel production, in particular to a lost foam graphite quenching 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 centralized feeding, which can realize the 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. [0003] In the long run, quartz sand is a non-renew...

Claims

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Application Information

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IPC IPC(8): B22C9/28B22C9/04B22D15/00
Inventor 严成群左跃刘彦磊彭俊汪耀张志邱风斌
Owner 信阳同合车轮有限公司
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