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Technological method for improving friction pair between plunger pump cylinder and valve plate

A technology of plunger pump and friction pair is applied in the field of improving the friction pair between the cylinder block of the plunger pump and the valve plate, which can solve the problems of easy falling off of sintered copper, high processing difficulty and high cost, so as to increase the stability of the product and prolong the service life. , cost saving effect

Inactive Publication Date: 2013-12-25
龙工(上海)精工液压有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, it also has the disadvantages of difficult processing, sintered copper is easy to fall off, and high cost.

Method used

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  • Technological method for improving friction pair between plunger pump cylinder and valve plate
  • Technological method for improving friction pair between plunger pump cylinder and valve plate
  • Technological method for improving friction pair between plunger pump cylinder and valve plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) smelting: the copper 62wt%, nickel 2.6wt%, iron 0.85wt%, cobalt 0.4wt%, aluminum 3.8wt%, lead 0.05wt% and the zinc of surplus are mixed by weight percentage, drop into smelting furnace, After melting at 1023°C, keep the temperature for 22 minutes, vacuumize the container, and fill it with nitrogen; heat the mixture to 340°C, keep it warm for 40 minutes, the ammonia decomposition rate is 18%, and the ammonia flow rate is 4Nm 3 / h; heat the mixture in the second step to 570°C, keep it warm for 300min, the decomposition rate of ammonia gas is 50%, and the flow rate of ammonia gas is 8Nm 3 / h. While raising the temperature and feeding ammonia, it is necessary to feed CO 2 , other flows are 5Nm in the first 300min 3 / h, the last 90min is 6Nm 3 / h. Then keep it warm for 90 minutes, the ammonia gas decomposition rate is >80%, and the ammonia gas flow rate is 2Nm 3 / h;

[0018] (2) Vertical semi-continuous casting: the smelted liquid copper alloy is poured into the ve...

Embodiment 2

[0022] (1) smelting: the copper 65wt% by weight percentage, nickel 3.0wt%, iron 1.1wt%, cobalt 0.6wt%, aluminum 4.2wt%, lead 0.15wt% and the zinc of surplus are mixed, drop into smelting furnace, After melting at 1053°C, the temperature is maintained for 24 minutes. After the container is evacuated, nitrogen is filled; the mixture is heated to 340°C and kept for 40 minutes. The ammonia decomposition rate is 25%, and the ammonia flow rate is 6Nm. 3 / h; heat the mixture in the second step to 570°C, keep it warm for 300min, the decomposition rate of ammonia gas is 60%, and the flow rate of ammonia gas is 10Nm 3 / h. While raising the temperature and feeding ammonia, it is necessary to feed CO 2 , other flows are 5Nm in the first 300min 3 / h, the last 90min is 6Nm 3 / h. Then keep it warm for 90 minutes, the ammonia gas decomposition rate is >80%, and the ammonia gas flow rate is 4Nm 3 / h;

[0023] (2) Vertical semi-continuous casting: the smelted liquid copper alloy is poured...

Embodiment 3

[0027] (1) Smelting: 63wt% of copper, 2.8wt% of nickel, 0.9wt% of iron, 0.5wt% of cobalt, 4.0wt% of aluminum, 0.10wt% of lead and the zinc of the balance are mixed in copper, and put into the smelting furnace. After melting at 1108°C, keep the temperature for 26 minutes, vacuumize the container, and fill it with nitrogen; heat the mixture to 340°C, keep it warm for 40 minutes, the ammonia decomposition rate is 20%, and the ammonia flow rate is 5Nm 3 / h; heat the mixture in the second step to 570°C, keep it warm for 300min, the decomposition rate of ammonia gas is 55%, and the flow rate of ammonia gas is 9Nm 3 / h. While raising the temperature and feeding ammonia, it is necessary to feed CO 2 , other flows are 5Nm in the first 300min 3 / h, the last 90min is 6Nm 3 / h. Then keep it warm for 90 minutes, the ammonia decomposition rate is >80%, and the ammonia flow rate is 3Nm 3 / h;

[0028] (2) Vertical semi-continuous casting: the smelted liquid copper alloy is poured into t...

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Abstract

The invention discloses a technological method for improving the friction pair between a plunger pump cylinder and a valve plate. The alloy material used for the valve plate is characterized by including the following components by weight part: 62-65wt% of copper, 2.6-3.0wt% of nickel, 0.85-1.1wt% of iron, 0.4-0.6wt% of cobalt, 3.8-4.2wt% of aluminum, 0.05-0.15wt% of lead and the balance zinc. A thermal treatment process used for the plunger pump cylinder is characterized by comprising: placing the raw materials in a container in proportion, performing vacuum pumping to the container, and introducing nitrogen into the container; heating the mixture to 340DEG C, and performing thermal insulation for 40min; heating the mixture to 570DEG C, and conducting thermal insulation for 300min; then performing thermal insulation for 90min; and conducting thermal insulation on the mixture for 23min at 80DEG C, then implementing discharge. According to the invention, the friction pair can tolerate high temperature and high pressure, and has high fatigue resistance toughness, thus prolonging the service life of parts.

Description

technical field [0001] The invention relates to a process method for improving the friction pair between a cylinder body of a plunger pump and a distribution plate, and belongs to the technical field of engineering materials. Background technique [0002] The cylinder body and valve plate of various high-pressure plunger pumps are generally used in combination with copper alloy and nitrided alloy steel, such as figure 1 As shown, the valve plate 2 is located at the bottom of the cylinder body 1 . The friction pair between the two is one of the three important friction pairs of the entire plunger pump. During the use of the plunger pump, the cylinder body 1 and the valve plate 2 are subjected to high temperature, high pressure and impact, so the surface of the cylinder body 1 or the valve plate 2 is required to have high strength, high hardness, high wear resistance and certain toughness. [0003] At present, the cylinder body of the high-tonnage plunger pump on the market ...

Claims

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Application Information

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IPC IPC(8): C22C9/04C23C8/24
Inventor 赵宁鲁启立张双红
Owner 龙工(上海)精工液压有限公司
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