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Preparation process of a low-cost hydraulic pump material suitable for copper clad process

A preparation process and technology for hydraulic pumps, applied in the field of pump materials, can solve problems such as low matrix strength, and achieve the effects of improving mechanical properties, good fatigue resistance, and reducing consumption

Active Publication Date: 2017-11-28
袁书强 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the above-mentioned deficiencies, the present invention provides the art with a low-cost hydraulic pump material preparation process suitable for the copper-clad process, so that it solves the problem of pro-eutectoid ferrite in the existing pump material 40Cr using copper clad at 1050 ° C, resulting in matrix Low strength, causing the technical problem of “off-sleeve” of wear-resistant copper sleeve in extrusion assembly of pump body

Method used

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  • Preparation process of a low-cost hydraulic pump material suitable for copper clad process
  • Preparation process of a low-cost hydraulic pump material suitable for copper clad process
  • Preparation process of a low-cost hydraulic pump material suitable for copper clad process

Examples

Experimental program
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Effect test

Embodiment 1

[0016] It is smelted in a 500 kg induction furnace, molded into an ingot with a diameter of 400 mm, and forged into a bar with a diameter of 125 mm by a 750 electro-hydraulic hammer. The material composition is C0.38%, Si1.2wt%, Mn0.70wt%, Cr0 .6wt%, S0.015wt%, P0.015wt%, B0.0015wt%, the balance is Fe.

[0017] The pump body blank is prepared by mechanical processing, using 1050°C ± 50°C copper clad process, 600°C ± 50°C nitriding treatment and induction treatment. The results are as follows: Copper clad at 1050°C, the tensile strength of the pump body sampling material is 915MPa; the nitriding hardness at 550°C is 652HV / 5Kg, and the depth is greater than 0.3mm; the hardness of the induction-treated teeth is greater than 356HV, the depth is greater than 0.5mm, and the hardness of the matrix is ​​346HV / 0.3Kg , to meet the requirements of the hydraulic pump on the mechanical properties of the material, the depth of the nitrided layer and the hardenability.

Embodiment 2

[0019] It is smelted in a 500 kg induction furnace, molded into an ingot with a diameter of 400 mm, and forged into a bar with a diameter of 125 mm by a 750 electro-hydraulic hammer. The material composition is C0.44wt%, Si1.6wt%, Mn1.00wt%, Cr1 .1wt%, S0.010wt%, P0.016wt%, B0.0030wt%, the balance is Fe.

[0020] The pump body blank is prepared by mechanical processing, using 1050°C ± 50°C copper clad process, 600°C ± 50°C nitriding treatment and induction treatment. The results are as follows: Copper clad at 1050°C, the tensile strength of the pump body sampling material is 923MPa, the nitriding hardness at 550°C is 665HV / 5Kg, and the depth is greater than 0.3mm; the hardness of the induction-treated teeth is greater than 534HV, the depth is greater than 0.5mm, and the hardness of the matrix is ​​346HV / 0.3Kg , to meet the requirements of the hydraulic pump on the mechanical properties of the material, the depth of the nitrided layer and the hardenability.

Embodiment 3

[0022] It is smelted in a 50-ton electric arc furnace, then refined in an LF furnace, vacuum degassed (VD), degassed and cast into an ingot, which is forged into a rod for the pump body. The material composition is C0.40wt%, Si1. 4wt%, Mn0.90wt%, Cr0.9wt%, S0.014wt%, P0.020wt%, B0.00165wt%, the balance is Fe.

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Abstract

The invention relates to a low-cost hydraulic pump material and a preparation process thereof. The hydraulic pump material is prepared from, by weigh percent, 0.37% to 0.44% of C, 1.2% to 1.6% of Si, 0.70% to 1.00% of Mn, 0.6% to 1.1% of Cr, not larger than 0.020% of S, not larger than 0.020% of P, 0.0005% to 0.003% of B and the balance Fe. The preparation process of the low-cost hydraulic pump material comprises the steps that the raw materials are formed according to the chemical component proportion and smelted through an electric-arc furnace, and continuous casting or mold casting is carried out to form an ingot blank through LF furnace refining and vacuum degassing (VD); and a bar needed for a hydraulic pump is formed through rolling or forging, the bar is machined into a pump blank, and a pump body is formed through a copper coating process at the temperature of 1,050+ / -50 DEG C. According to the low-cost hydraulic pump material and the preparation process thereof, separated-out proeutectoid ferrite can be avoided or reduced, the strength of the pump can be improved, loosening and extracting of an extruding assembly copper sleeve can be avoided, and the requirement of the hydraulic pump for the mechanical property, nitration layer depth and hardenability of the materials can be met.

Description

technical field [0001] The invention relates to the field of pump materials, and relates to a low-cost hydraulic pump material preparation process suitable for a copper-clad process. Background technique [0002] 42CrMo and 40Cr commonly used in the hydraulic industry are used as pump body materials. After a series of heat treatments such as copper cladding, nitriding, and induction treatment, they are machined to meet the specified precision and performance requirements of the product. Since thermal processes such as copper cladding, nitriding, and induction treatment have a great impact on the structure and properties of the material, 42CrMo is an ideal material with less pro-eutectoid ferrite precipitation during copper cladding, but it contains expensive , Mo element with less reserves, the price fluctuates greatly and the cost is high, which makes it difficult to control the cost of the pump body and brings great risks to the cost control and operation of the enterprise...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/32C22C38/18C22C38/04C22C38/02C22C33/04
CPCC22C33/04C22C38/02C22C38/04C22C38/18C22C38/32
Inventor 袁书强郁浩峰程兴旺
Owner 袁书强
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