Method for precisely casting coupler head of high-speed train

Abstract

The invention relates to a motor coupler head accessory, and provides a method for precisely casting a high-speed rail motor coupler head, which mainly comprises the following steps: designing a casting mold, carrying out MAGMA simulation, manufacturing an evanescent mode, manufacturing a mold shell, roasting, smelting, controlling components, deoxidizing, casting sand and pouring, carrying out heat treatment, carrying out physical and chemical detection, carrying out nondestructive detection, carrying out repair welding and carrying out final inspection. The key process is innovated as evanescent mode making: a hook head model is made of foamed plastic; a mold shell is manufactured, specifically, the mold is coated with a silica sol binder and air-dried to form the mold shell; roasting: heating the mold shell to gasify the foamed plastic to obtain a cavity mold shell; sand culture and pouring are conducted, specifically, the cavity mold shell is put into a sand box for sand culture and then pouring is conducted; heat treatment is conducted, specifically, a casting is a new material ZG25CrMoV, water cooling quenching is conducted at the temperature of 920 + / -14 DEG C, air cooling tempering is conducted at the temperature of 680 + / -14 DEG C, and according to the physical and chemical properties, the casting comprises the chemical components of 0.12%-0.26% of C, 0.30%-0.60% of Si, 1.40%-1.60% of Mn, smaller than or equal to 0.025% of P, smaller than or equal to 0.020% of S, 0.30% of Cr, 0.20%-0.40% of Mo, 0.05%-0.10% of V and smaller than or equal to 0.7% of CE; according to the mechanical properties, Rm is 700 MPa, Rp0.2 is larger than or equal to 600 MPa, A is larger than or equal to 20%, and HB is smaller than or equal to 285HBW. And after the casting is completed, the dimensional precision is high, the form and location tolerance is small, and the surface roughness is low.

Description

technical field [0001] The invention relates to a low-alloy steel new material ZG25CrMoV used for a high-speed rail motor vehicle hook head, and provides a method for precision casting a high-speed rail motor vehicle hook head. , The main process parameters of the heat treatment process. Realize physical and chemical properties of castings: chemical composition is C 0.12~0.26%, Si 0.30~0.60%, Mn1.40~1.60%, P≤0.025%, S≤0.020%, Cr 0.30%, Mo 0.20~0.40%, V 0.05~ 0.10%, CE≤0.70%; mechanical properties Rm≥700MPa, Rp0.2≥600MPa, A≥20%, HB≤285HBW. After the casting is completed, the dimensional accuracy is not lower than the national standard GB / T6414 DCTG8 , Surface roughness ≤Ra6.3, to ensure that the shape and position tolerances meet the requirements of the drawings. Improve strength and hardenability. Background technique [0002] The internationally advanced high-speed rail coupler is high-end equipment. The dimensional accuracy of the coupler casting is not lower than DCTG...

AI Technical Summary

Problems solved by technology

Although precision casting can ensure that the dimensional accuracy is not lower than the national standard GB / T6414 DCTG9, the surface roughness ≤ Ra6.3, and the shape and position tolerance meet the requirements specified in the drawings, but it is difficult to make wax patterns, and the deformation is large, and the strength is low and easy to break

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