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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 first mix the alloy powder and adhesive to form a paste, brush and adhere to the surface of the casting mold, and then cast. This preparation method is simple and low in cost, but it also faces many problems: if the adhesive volatilizes during the casting process, pores will be generated and black residue will be left; Melt the alloy powder completely, resulting in poor bonding between the alloy powder and the surface of the substrate, and the surface of the reinforcement layer is uneven

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The plunger matrix of the plunger in this embodiment is composed of the following components in weight percentage: C 0.4%, Mn 0.8%, Cr 5.0%, Cu 0.9%, Ti 1.2%, V: 0.8%, Nb: 0.5%, Al 1.2 %, the balance is Fe. Weigh the alloy steel raw material according to the above ratio, put it into a vacuum melting furnace, heat it 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 on the In the mold of the plug base, cool naturally; heat up to 1500°C, keep warm for 1.5h, place in cold water for quenching, then heat to 400°C at a speed of 0.3°C / s, keep warm for 4h, and cool naturally to get the 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 silicon dioxide particles. Weigh each component, put Fe, Hf, Os, B, Sc and V into a ball mill and mill for 3 hours, vacuum dry for 40 minutes, sieve to obtain a 40...

Embodiment 2

[0021] The plunger matrix of the plunger in this embodiment is composed of the following components in weight percentage: C 0.4%, Mn 0.8%, Cr 5.0%, Cu 0.9%, Ti 1.2%, V: 0.8%, Nb: 0.5%, Al 1.2 %, the balance is Fe. Weigh the alloy steel raw material according to the above ratio, put it into a vacuum melting furnace, heat it 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 on the In the mold of the plug base, cool naturally; heat up to 1500°C, keep warm for 1.5h, place in cold water for quenching, then heat to 400°C at a speed of 0.3°C / s, keep warm for 4h, and cool naturally to get the 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 silicon dioxide particles. Weigh each component, put Fe, Hf, Os, B, Sc and V into a ball mill and mill for 3 hours, vacuum dry for 40 minutes, sieve to obtain a 10...

Embodiment 3

[0023] The plunger matrix of the plunger in 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 material according to the above ratio, put it into a vacuum melting furnace, heat it 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 on the In the mold of the plug base, cool naturally; heat up to 1500°C, keep warm for 1.5h, place in cold water for quenching, then heat to 400°C at a speed of 0.3°C / s, keep warm for 4h, and cool naturally to get the 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 silicon dioxide particles. Weigh each component, put Fe, Hf, Os, B, Sc and V into a ball mill and mill for 3 hours, vacuum dry for 40 minutes, sieve to obtain a 400-mesh mixture, t...

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PUM

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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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