Plunger

The technology of a plunger and a plunger base body is applied to a plunger. It can solve the problems affecting the properties of the reinforcement layer, cracks in the cladding layer, and limited casting waste heat, and achieve excellent wear resistance and mechanical properties, dense reinforcement layer, and reduced thermal stress.

Inactive Publication Date: 2018-06-01
SAIKESI HYDRAULIC TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ordinary laser cladding process easily leads to uneven distribution of the reinforcement layer due to the rapid heating and rapid solidification of the laser, and the presence of large internal tensile stress in the cladding layer causes cracks in the cladding layer, which will affect the strength of the reinforcement layer. Nature presents
In the prior art, there are research reports to form a reinforcing layer on the surface of the substrate by casting alloying, but they fi

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0018] Example 1

[0019] The plunger matrix of the plunger of this embodiment is composed of the following components by weight percentage: C 0.4%, Mn 0.8%, Cr5.0%, Cu 0.9%, Ti 1.2%, V: 0.8%, Nb: 0.5%, Al 1.2 %, the balance is Fe. Weigh the alloy steel raw materials according to the above ratio, put them into a vacuum melting furnace, heat to 800°C to melt, and cast the plunger matrix; place the plunger matrix as an inlay in the mold, heat the alloy powder to 1100°C, and cast it into the column In the mold of the plug matrix, cool naturally; heat up to 1500°C, heat preservation for 1.5h, put it in cold water for quenching, then heat to 400°C at a rate of 0.3°C / s, heat preservation for 4h, and cool naturally to obtain a plunger. The alloy powder is 40 parts by weight of Fe, 3 parts of Hf, 5 parts of Os, 6 parts of B, 3 parts of Sc, 2 parts of V, and 2 parts of silica particles. Weigh each component, put Fe, Hf, Os, B, Sc, and V into a ball mill for 3 hours, dry for 40 minutes, ...

Example Embodiment

[0020] Example 2

[0021] The plunger matrix of the plunger of this embodiment is composed of the following components by weight percentage: C 0.4%, Mn 0.8%, Cr5.0%, Cu 0.9%, Ti 1.2%, V: 0.8%, Nb: 0.5%, Al 1.2 %, the balance is Fe. Weigh the alloy steel raw materials according to the above ratio, put them into a vacuum melting furnace, heat to 800°C to melt, and cast the plunger matrix; place the plunger matrix as an inlay in the mold, heat the alloy powder to 1100°C, and cast it into the column In the mold of the plug matrix, cool naturally; heat up to 1500°C, heat preservation for 1.5h, put it in cold water for quenching, then heat to 400°C at a rate of 0.3°C / s, heat preservation for 4h, and cool naturally to obtain a plunger. The alloy powder is 40 parts by weight of Fe, 3 parts of Hf, 5 parts of Os, 6 parts of B, 3 parts of Sc, 2 parts of V, and 2 parts of silica particles. Weigh each component, put Fe, Hf, Os, B, Sc, and V into a ball mill for 3 hours, dry for 40 minutes, ...

Example Embodiment

[0022] Example 3

[0023] The plunger matrix of the plunger of this embodiment is composed of the following components by weight percentage: C 0.4%, Mn 0.8%, Cr 5.0%, Cu 0.9%, Ti 1.2%, Al 1.2%, and the balance is Fe. Weigh the alloy steel raw materials according to the above ratio, put them into a vacuum melting furnace, heat to 800°C to melt, and cast the plunger matrix; place the plunger matrix as an inlay in the mold, heat the alloy powder to 1100°C, and cast it into the column In the mold of the plug matrix, cool naturally; heat up to 1500°C, heat preservation for 1.5h, put it in cold water for quenching, then heat to 400°C at a rate of 0.3°C / s, heat preservation for 4h, and cool naturally to obtain a plunger. The alloy powder is 40 parts by weight of Fe, 3 parts of Hf, 5 parts of Os, 6 parts of B, 3 parts of Sc, 2 parts of V, and 2 parts of silica particles. Weigh the components, put Fe, Hf, Os, B, Sc, and V into a ball mill for 3 hours, dry in a vacuum for 40 minutes, siev...

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Abstract

The invention relates to the field of hydraulic pumps, in particular to a plunger. The plunger is composed of a plunger matrix and a reinforcing layer formed on the surface of the plunger matrix. Theplunger matrix is composed of, by weight, 0.3%-0.65% of C, 0.5-0.9% of Mn, 4.3%-6.6% of Cr, 0.5%-1.3% of Cu, 0-1.5% of Ti, 0-1.2% of V, 0-0.9% of Nb, 0.5%-2.5% of Al and the balance Fe. The reinforcing layer is alloy powder.

Description

technical field [0001] The present invention relates to the field of hydraulic pumps, more specifically, it relates to a plunger. Background technique [0002] The plunger is an important device in the hydraulic system. It relies on the reciprocating movement of the plunger in the cylinder to change the volume of the sealed working chamber to realize oil absorption and oil pressure. The plunger has the advantages of high rated pressure, compact structure, high efficiency and convenient flow adjustment. Plungers are widely used in high pressure, large flow and occasions where the flow needs to be adjusted, such as hydraulic presses, engineering machinery and ships. [0003] The plunger is the core part of the plunger. The plunger is always under pressure when it is working, so it must have sufficient rigidity; the weight of the plunger is often large, and it is easy to sag from the self-weight surface when it is placed horizontally, causing unilateral wear of the seal and g...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/20C22C38/28C22C38/24C22C38/26C22C38/06C23C6/00F04B53/14
CPCC22C38/04C22C38/06C22C38/20C22C38/24C22C38/26C22C38/28C23C6/00F04B53/14
Inventor 姚广山
Owner SAIKESI HYDRAULIC TECH CO LTD
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