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Processing method of casting for manufacturing high-strength intermediate jacking station

A processing method and high-strength technology, applied in the field of mechanical processing, can solve the problems of high safety requirements for workers, high difficulty, high power, etc., and achieve the effect of eliminating the risk of fracture and improving hardness

Pending Publication Date: 2021-01-05
江苏荣耀机械制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] During long-distance pipe jacking construction, it is difficult to precisely control the direction due to many pipe joints and uneven force transmission, and the power to overcome frictional resistance is large; at the same time, it is also faced with high safety requirements for workers entering the excavated soil. Low efficiency and other disadvantages

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A processing method for castings for manufacturing high-strength relay rooms, characterized in that it includes the following specific steps:

[0018] (1) Casting preparation: Choose a casting made of 50Mn steel. The casting is composed of the following components and their mass percentages: C: 0.48-0.56%, Si: 0.17-0.37%, Mn: 0.7-1.0%, P≤0.035% , S≤0.035%, Cr≤0.25%, Ni≤0.3%, Cu≤0.25%, the balance is Fe;

[0019] The role of each chemical element in 50Mn is:

[0020] C: Balance the strength, hardness, plasticity and toughness of steel.

[0021] Si: It can be dissolved in ferrite and austenite to increase the hardness and strength of steel, and increase the elastic limit, yield strength and yield ratio of steel, as well as fatigue strength and fatigue ratio. It has the effect of solid solution strengthening, improves hardenability and tempering resistance, is beneficial to improving comprehensive mechanical properties, improves elastic limit, and increases wear resistan...

Embodiment 2

[0034] Compared with Example 1, the rest of the features remain unchanged. In the step (2) annealing treatment, the casting is heated to 650 ° C and kept for 2 hours; in the step (3) quenching treatment, the quenching temperature is 830 ° C; in the step (4) tempering treatment The casting is heated up to 210°C and held for 2 hours.

Embodiment 3

[0036] Compared with Example 1, the rest of the features remain the same, the temperature of the casting in step (2) annealing treatment is raised to 580 ° C, and it is kept for 3 hours; the quenching temperature in step (3) in quenching treatment is 820 ° C; in step (4) in tempering treatment The casting is heated up to 200°C and kept for 2.5h.

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Abstract

The invention discloses a processing method of a casting for manufacturing a high-strength intermediate jacking station, and relates to the technical field of machining. The processing method sequentially includes the steps of casting preparation, annealing treatment, quenching treatment, tempering treatment, pickling and electroplating as well as painting treatment. According to the method, by means of material selection, heat treatment, chemical treatment and the like of the casting, the produced intermediate jacking station has the high strength, the high hardness, the high wear resistanceand the relatively-good corrosion resistance.

Description

technical field [0001] The invention relates to the technical field of mechanical processing, in particular to a processing method of a casting for manufacturing a high-strength relay room. Background technique [0002] During long-distance pipe jacking construction, it is difficult to precisely control the direction due to many pipe joints and uneven force transmission, and the power to overcome frictional resistance is large; at the same time, it is also faced with high safety requirements for workers entering the excavated soil. Low efficiency and other shortcomings. In order to overcome the above problems, relay rooms are often used in long-distance pipe jacking. [0003] The relay room is generally made of steel. During use, the relay room will be subjected to the propulsion jacking force and the friction with the front and rear pipe sections and the surrounding mud and sand during the forward process. In order to ensure the long service life of the relay room, a relay...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/18C21D1/30C21D1/42C21D6/00C22C38/02C22C38/04C22C38/42C23G1/08C25D3/22
CPCC21D1/18C21D1/30C21D1/42C21D6/004C21D6/005C21D6/008C22C38/02C22C38/04C22C38/42C23G1/08C25D3/22Y02P10/25
Inventor 陈刚
Owner 江苏荣耀机械制造有限公司
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