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A method for near-solid pressure forming of train wheels

A near-solid-state wheel technology, applied in the field of near-solid pressure forming of train wheels, can solve the problems of large equipment investment, high production cost, waste of materials, etc., and achieve the effect of small equipment investment, high production cost and short process flow

Inactive Publication Date: 2016-08-24
TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the technical problems of many processes, large equipment investment, high production cost, material waste and serious energy consumption in the existing steel rolling wheel production method, and to provide a method for train wheel near-solid pressure forming

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] A method for near-solid pressure forming of train wheels, wherein it comprises the steps of:

[0014] 1) Alloy smelting: use 50tUHP electric arc furnace to smelt metal raw materials, the smelting temperature is 1685°C, stop heating after forming molten steel;

[0015] 2) Casting slabs for train wheels: when the temperature of molten steel drops to 1560°C, pour it into a metal mold, and the metal mold is cooled slowly, and the change of its solid phase volume fraction is monitored in real time;

[0016] 3) Compression forming at near-solid temperature: when the solid phase volume fraction of the train wheel slab in the metal mold reaches 70%, the train wheel is pressurized by an 80MN hydraulic press at a pressure of 70MPa and a pressurization speed of 40mm / s.

[0017] The metal raw material in this embodiment is medium-high carbon micro-alloy steel, and the weight percentage of each element is: C is 0.42%-0.64%, Mn is 0.75%-0.80%, Cr is 0.16%-0.3%, and Si is 0.4%. ~0.46...

Embodiment 2

[0019] A method for near-solid pressure forming of train wheels, wherein it comprises the steps of:

[0020] 1) Alloy smelting: use 50tUHP electric arc furnace to smelt metal raw materials, the smelting temperature is 1655℃, stop heating after forming molten steel;

[0021] 2) Casting slabs for train wheels: when the temperature of the molten steel drops to 1540°C, it is poured into a metal mold, and the metal mold is cooled slowly, and the change of its solid phase volume fraction is monitored in real time;

[0022] 3) Compression forming at near-solid temperature: when the solid phase volume fraction of the train wheel billet in the metal mold reaches 60%, the train wheel is pressurized by an 80MN hydraulic press, the pressure is 65MPa, and the pressurization speed is 35mm / s.

[0023] The metal raw materials in this example are the same as those in Example 1.

Embodiment 3

[0025] A method for near-solid pressure forming of train wheels, wherein it comprises the steps of:

[0026] 1) Alloy smelting: use 50tUHP electric arc furnace to smelt metal raw materials, the smelting temperature is 1675℃, stop heating after forming molten steel;

[0027] 2) Casting slabs for train wheels: when the temperature of molten steel drops to 1550°C, pour it into a metal mold, and the metal mold is cooled slowly, and the change of its solid phase volume fraction is monitored in real time;

[0028] 3) Compression forming at near-solid temperature: when the solid phase volume fraction of the train wheel slab in the metal mold reaches 65%, the train wheel is pressurized by an 80MN hydraulic press, the pressure is 67MPa, and the pressurization speed is 36mm / s.

[0029] The metal raw materials in this example are the same as those in Example 1.

[0030] The present invention is not limited to the above-mentioned embodiments, as long as the method of processing train whe...

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PUM

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Abstract

The invention belongs to the field of train wheel forming machining, and particularly relates to a train wheel nearly-solid pressure forming method which aims at solving the technical problems that an existing rolled steel wheel producing method has many procedures, is large in device investment and high in production cost, wastes materials and is high in energy consumption. The method includes the following steps of firstly, conducting alloy smelting, wherein metal raw materials are smelted through a 50tUHP electric arc furnace, the smelting temperature ranges from 1655 DEG C to 1685 DEG C, and heating is stopped after molten steel is formed; secondly, casting a train wheel ingot blank, wherein the molten steel is poured into a metal die after the temperature of the molten steel falls to the range of 1540 DEG C to 1560 DEG C, the metal die slowly cools, and the change of the solid phase size fraction of the molten steel is monitored in real time; thirdly, conducting nearly-solid temperature pressure forming, wherein when the solid phase size fraction of the train wheel ingot blank in the metal die reaches the range of 60% to 70%, a train wheel is formed through pressurizing of an 80MN hydraulic machine, the specific pressure intensity ranges from 65 MPa to 70 MPa, and the pressurizing speed ranges from 35 mm / s to 40 mm / s. The train wheel nearly-solid pressure forming method has the advantages of being short in technological process, simple in procedure, small in device investment, high in raw material utilization rate and capable of saving energy.

Description

technical field [0001] The invention belongs to the field of forming and processing of train wheels, and in particular relates to a near-solid pressure forming method for train wheels. Background technique [0002] Existing train wheel mainly is to be divided into cast steel wheel and rolled steel wheel. The carbon content of the material for cast steel wheels is high, and the production process of cast steel wheels is smelting-graphite casting-heat treatment-machining; the process is simple, the dimensional accuracy is high, and energy consumption is reduced, but the produced wheels have low plasticity and toughness. Poor, unable to meet the requirements of railways for high-speed wheels and heavy-duty wheels. The materials used for rolling steel wheels have reduced carbon content and are alloyed with vanadium. The production process is smelting-continuous casting round billet-heating-upsetting-pre- Forming-punching-rolling-bending. The train wheels produced by this method...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D18/02C22C38/46
Inventor 李永堂秦芳诚闫红红
Owner TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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