Preparation process of modern track low-floor motor train large-scale integral forging axle

Abstract

Provided is a preparation process of a modern track low-floor motor train large-scale integral forging axle. The preparation process includes that 34CrNiMo6 is taken as the raw material and is subjected to arc furnace melting and vacuum smelting to obtain steel ingot, and a blank material is obtained through electroslag re-dissolving; after the two ends of the blank material are drawn to be pre-forging blank materials by a free forging hammer, the pre-forging blank materials are preheated by an electrothermal far-infrared heating furnace and then is heated and insulated by a natural gas furnace; an axel head and axel shoulders are forged on the heated pre-forging blank materials, leftover material edges are removed, the heated pre-forging blank materials with the axel head and axel shoulders are returned to the furnace to be heated, the waist part is drawn out by the free forging hammer, and then the heated pre-forging blank materials with the drawn-out waist part are returned to the furnace to be heated, the heated pre-forging blank materials with the axel head, the axel shoulders, and the drawn-out waist part are put into an axel forging forming die to be integrally forged and formed to obtain a product. The preparation process is advantageous in that the raw material components are strictly controlled to meet the mechanical performance indexes of the product; and the integral forging forming is carried out after the local pre-forging, the forging quality is guaranteed, the waste can be reduced, the yield is improved, and the product performance meets the national standard.

Description

technical field

[0001] The invention relates to a preparation process of a large integral forged axle bridge of a modern track low-floor motor vehicle. Background technique

[0002] The axle bridge is an important component on the bogie of a low-floor train. At present, low-floor axle bridges are mainly produced by casting. There are many kinds of defects in the casting axle bridge production process, and the reasons for the defects are also very complicated. It is not only related to the casting process, but also related to the properties of the casting alloy. , Alloy smelting, performance of molding materials and other factors, it is difficult to guarantee the stability of the process, and quality problems such as shrinkage porosity and pores are prone to occur. With the development of urban rail trains, the continuous pursuit of safety, stability, high speed, and low-floor axle bridges with excellent mechanical properties is an inevitable trend in the development of axle...

Examples

Embodiment 1

[0033] 1. Raw material preparation

[0034] Using low-alloy high-strength steel 34CrNiMo6 as raw material, the steel ingot is obtained by electric arc furnace melting and vacuum smelting, and then the low-alloy high-strength steel 34CrNiMo6 billet with a specification of Ф365mm×1100mm is obtained through electroslag remelting; among them, the composition of the low-alloy high-strength steel 34CrNiMo6 billet It is: the mass fraction of C element in the low-alloy high-strength steel 34CrNiMo6 billet is 0.30%, the mass fraction of Si is 0.40%, the mass fraction of Mn is 0.80%, the mass fraction of Cr is 1.30%, and the mass fraction of Mo is 0.30% , the mass fraction of Ni is 1.30%; the mass fraction of the P element in the low-alloy high-strength steel 34CrNiMo6 blank is 0.025%, and the mass fraction of the S element is 0.013%;

[0035] 2. Blank pre-forging

[0036] Use a three-ton free forging hammer to pull the blank into a pre-forged blank with three parts: the shaft head 1, ...

Embodiment 2

[0047] 1. Raw material preparation

[0048] Using low-alloy high-strength steel 34CrNiMo6 as raw material, the steel ingot is obtained by electric arc furnace melting and vacuum smelting, and then the low-alloy high-strength steel 34CrNiMo6 blank with a specification of Ф400mm)×1400mm is obtained through electroslag remelting. Among them, the low-alloy high-strength steel 34CrNiMo6 blank is The composition is: the mass fraction of C element in the low-alloy high-strength steel 34CrNiMo6 billet is 0.38%, the mass fraction of Si is 0.38%, the mass fraction of Mn is 0.50%, the mass fraction of Cr is 1.70%, and the mass fraction of Mo is 0.15% %, the mass fraction of Ni is 1.70%; the mass fraction of the P element in the low-alloy high-strength steel 34CrNiMo6 blank is 0.022%, and the mass fraction of the S element is 0.015%;

[0049] 2. Blank pre-forging

[0050] Use a three-ton free forging hammer to pull the blank into a pre-forged blank with three parts: the shaft head, the s...

Embodiment 3

[0061] 1. Raw material preparation

[0062] Using low-alloy high-strength steel 34CrNiMo6 as raw material, electric arc furnace melting and vacuum smelting are used to obtain steel ingots, and then electroslag remelting is used to obtain low-alloy high-strength steel 34CrNiMo6 blanks with a specification of Ф380mm×1200mm. Among them, the low-alloy high-strength steel 34CrNiMo6 blanks are The composition is: the mass fraction of C element is 0.33%, the mass fraction of Si is 0.35%, the mass fraction of Mn is 0.60%, the mass fraction of Cr is 1.40%, the mass fraction of Mo is 0.20%, and the mass fraction of Ni is 1.50 %; The mass fraction of the P element in the low-alloy high-strength steel 34CrNiMo6 blank is 0.023%, and the mass fraction of the S element is 0.014%;

[0063] 2. Blank pre-forging

[0064] Use a three-ton free forging hammer to pull the blank into a pre-forged blank with three parts: the shaft head, the shaft shoulder and the shaft waist (such as figure 1 shown...

technical field

[0001] The invention relates to a preparation process of a large integral forged axle bridge of a modern track low-floor motor vehicle. Background technique

[0002] The axle bridge is an important component on the bogie of a low-floor train. At present, low-floor axle bridges are mainly produced by casting. There are many kinds of defects in the casting axle bridge production process, and the reasons for the defects are also very complicated. It is not only related to the casting process, but also related to the properties of the casting alloy. , Alloy smelting, performance of molding materials and other factors, it is difficult to guarantee the stability of the process, and quality problems such as shrinkage porosity and pores are prone to occur. With the development of urban rail trains, the continuous pursuit of safety, stability, high speed, and low-floor axle bridges with excellent mechanical properties is an inevitable trend in the development of axle...

Examples

Embodiment 1

[0033] 1. Raw material preparation

[0034] Using low-alloy high-strength steel 34CrNiMo6 as raw material, the steel ingot is obtained by electric arc furnace melting and vacuum smelting, and then the low-alloy high-strength steel 34CrNiMo6 billet with a specification of Ф365mm×1100mm is obtained through electroslag remelting; among them, the composition of the low-alloy high-strength steel 34CrNiMo6 billet It is: the mass fraction of C element in the low-alloy high-strength steel 34CrNiMo6 billet is 0.30%, the mass fraction of Si is 0.40%, the mass fraction of Mn is 0.80%, the mass fraction of Cr is 1.30%, and the mass fraction of Mo is 0.30% , the mass fraction of Ni is 1.30%; the mass fraction of the P element in the low-alloy high-strength steel 34CrNiMo6 blank is 0.025%, and the mass fraction of the S element is 0.013%;

[0035] 2. Blank pre-forging

[0036] Use a three-ton free forging hammer to pull the blank into a pre-forged blank with three parts: the shaft head 1, ...

Embodiment 2

[0047] 1. Raw material preparation

[0048] Using low-alloy high-strength steel 34CrNiMo6 as raw material, the steel ingot is obtained by electric arc furnace melting and vacuum smelting, and then the low-alloy high-strength steel 34CrNiMo6 blank with a specification of Ф400mm)×1400mm is obtained through electroslag remelting. Among them, the low-alloy high-strength steel 34CrNiMo6 blank is The composition is: the mass fraction of C element in the low-alloy high-strength steel 34CrNiMo6 billet is 0.38%, the mass fraction of Si is 0.38%, the mass fraction of Mn is 0.50%, the mass fraction of Cr is 1.70%, and the mass fraction of Mo is 0.15% %, the mass fraction of Ni is 1.70%; the mass fraction of the P element in the low-alloy high-strength steel 34CrNiMo6 blank is 0.022%, and the mass fraction of the S element is 0.015%;

[0049] 2. Blank pre-forging

[0050] Use a three-ton free forging hammer to pull the blank into a pre-forged blank with three parts: the shaft head, the s...

Embodiment 3

[0061] 1. Raw material preparation

[0062] Using low-alloy high-strength steel 34CrNiMo6 as raw material, electric arc furnace melting and vacuum smelting are used to obtain steel ingots, and then electroslag remelting is used to obtain low-alloy high-strength steel 34CrNiMo6 blanks with a specification of Ф380mm×1200mm. Among them, the low-alloy high-strength steel 34CrNiMo6 blanks are The composition is: the mass fraction of C element is 0.33%, the mass fraction of Si is 0.35%, the mass fraction of Mn is 0.60%, the mass fraction of Cr is 1.40%, the mass fraction of Mo is 0.20%, and the mass fraction of Ni is 1.50 %; The mass fraction of the P element in the low-alloy high-strength steel 34CrNiMo6 blank is 0.023%, and the mass fraction of the S element is 0.014%;

[0063] 2. Blank pre-forging

[0064] Use a three-ton free forging hammer to pull the blank into a pre-forged blank with three parts: the shaft head, the shaft shoulder and the shaft waist (such as figure 1 shown...

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