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Thermal treatment process for plunger of axial plunger pump

A technology of axial plunger pump and plunger, applied in heat treatment furnace, heat treatment equipment, metal material coating process, etc., can solve the problems of long processing time, limited range of material selection, high production cost, etc., and achieve low heat treatment cost, The effect of fast heat treatment and short time

Inactive Publication Date: 2012-01-25
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

[0003] In the past, in order to achieve both wear resistance and good toughness of the plunger, the heat treatment method of nitriding was often used, but the nitriding treatment is suitable for steel types containing alloy elements such as Cr, Mo, Al, W, V, Ti, etc., so that Limited range of material selection
At the same time, the nitriding heat treatment time is as long as more than 20 hours, and the production cost is high

Method used

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  • Thermal treatment process for plunger of axial plunger pump
  • Thermal treatment process for plunger of axial plunger pump

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The invention provides a plunger heat treatment process for an axial plunger pump. The steps are:

[0016] Step 1. Put the semi-finished plunger into a vacuum furnace, and heat it up to 920°C for 15 minutes;

[0017] Step 2, keep warm for 35 minutes;

[0018] Step 3. Cool down to 845°C and release the furnace. Fill the vacuum furnace with acetylene and nitrogen while heating, maintaining and cooling to realize the carbonitriding treatment of the surface layer of the plunger. Nitrogen is used for nitriding. For carburizing treatment, it is divided into 6 stages and each stage lasts for 3 minutes;

[0019] Step 4. After being released from the furnace, quenching treatment is performed, followed by tempering treatment. The tempering temperature is 130° C., and finally air-cooled to room temperature.

Embodiment 2

[0021] The invention provides a plunger heat treatment process for an axial plunger pump. The steps are:

[0022] Step 1. Put the semi-finished plunger into a vacuum furnace, and heat it up to 930°C for 20 minutes;

[0023] Step 2, keep warm for 30 minutes;

[0024] Step 3. Cool down to 850°C and release the furnace. Fill the vacuum furnace with acetylene and nitrogen while heating, maintaining and cooling to realize the carbonitriding treatment of the surface of the plunger. Nitrogen is continuously charged, and acetylene is charged in 6 stages. Enter, each segment lasts 3 minutes;

[0025] Step 4: Quenching treatment is performed after being released from the furnace, followed by tempering treatment. The tempering temperature is 140° C., and finally air-cooled to room temperature.

[0026] The process route of above-mentioned steps is as figure 1 shown.

Embodiment 3

[0028] The invention provides a plunger heat treatment process for an axial plunger pump. The steps are:

[0029] Step 1. Put the semi-finished plunger into a vacuum furnace, and heat it up to 940°C for 25 minutes;

[0030] Step 2, keep warm for 25 minutes;

[0031] Step 3, cooling down to 855°C, and filling the vacuum furnace with acetylene and nitrogen while heating, maintaining, and cooling, to realize the carbonitriding treatment of the surface layer of the plunger, nitrogen is continuously charged, and the acetylene is divided into 6 parts. segment charging, each segment lasts 3 minutes;

[0032] Step 4. After being released from the furnace, quenching treatment is performed, followed by tempering treatment. The tempering temperature is 150° C., and finally air-cooled to room temperature.

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Abstract

The invention provides a thermal treatment process for a plunger of an axial plunger pump, which is characterized by comprising the following steps of: (1) putting a semi-finished plunger into a vacuum furnace, and heating to 920-940 DEG C via 15-25 min; (2) preserving heat for 25-35 min; (3) cooling to 845-855 DEG C, discharging the plunger, and charging acetylene and nitrogen to the vacuum furnace while preserving heat and cooling to realize carbonitriding on the surface of the plunger; (4) quenching the plunger after discharging, subsequently tempering plunger at the temperature of 130-150 DEG C, and finally air-cooling the plunger to room temperature. In the invention, a hardened layer with high hardness and high wear resistance is formed on the surface of the plunger through carbonitriding on the surface of the plunger. Therefore, the invention has the advantages of wide plunger material selection, high thermal treatment speed, short time consumption and low thermal treatment cost.

Description

technical field [0001] The invention relates to a plunger heat treatment process for an axial plunger pump (motor), and belongs to the technical field of manufacture of an axial plunger pump (motor). Background technique [0002] The swash plate piston pump (motor) is widely used in construction machinery due to its advantages of high pressure, high speed, small size and convenient variable control. The plunger is the core part of the swash plate plunger pump (motor). Since the plunger not only reciprocates in the cylinder body, but also rotates together with the cylinder body, so the surface of the plunger is required to be wear-resistant, and the heart The part must have good toughness and high comprehensive mechanical properties. [0003] In the past, in order to achieve both wear resistance and good toughness of the plunger, the heat treatment method of nitriding was mostly used, but the nitriding treatment is suitable for steels containing alloying elements such as Cr,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/00C23C8/32
Inventor 陈超卢宗平李小亮张晓波
Owner 龙工(上海)精工液压有限公司
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