Double-metal side plate with wear-resistant coating

Abstract

The utility model belongs to hydraulic application parts in the mechanical industry, and particularly relates to a wear-resistant coating bimetallic side plate of a gear pump. A wear-resistant coating is arranged on the surface of a copper alloy layer of the bimetallic side plate, the thickness of the wear-resistant coating is 1.5-2.5 microns, and the physical and chemical properties of the surface of a workpiece are improved under the condition that the original size of the workpiece is almost not influenced; the hardness of the wear-resistant coating is greater than 2100HV and is far higher than that of a metal material, so that the wear-resistant coating can still keep low wear rate even under high load; the friction coefficient is only 0.05-0.1, so that the friction heat and the energy consumption are reduced, and the friction material is suitable for a high-speed environment; the gear pump has good self-lubrication performance, low friction can still be maintained even if lubrication is poor, and the risks of side plate sintering and gear pump failure caused by dry friction are reduced; and the coating is resistant to high temperature and still keeps excellent coating adhesion in repeated heat cycles. Therefore, when the starting rotating speed of the gear pump is too high or in a low-temperature environment in winter, the side plate has self-lubricating property and high surface hardness, the friction coefficient can be reduced, the wear resistance is improved, and the service life of the gear pump is prolonged.

Description

Technical Field

[0001] This utility model pertains to hydraulic application components in the machinery industry, and specifically relates to a wear-resistant coated bimetallic side plate for a gear pump. Background Technology

[0002] As a green alternative to traditional fuel vehicles, new energy vehicles are increasingly widely used in construction, mining, and port industries due to their advantages such as environmental friendliness, high efficiency, and intelligence. To continuously promote the development of new energy, the government has been issuing policies to encourage and support the application of new energy vehicles and promote vehicle electrification. Gear pumps, as a key component, require continuous optimization of product design and improvement of product quality to meet the demands of high-speed start-up and extremely cold operating conditions. The side plate, as a crucial component of the gear pump, primarily ensures the pump's efficient operation and sealing performance; its design directly affects the pump's performance and lifespan. When aluminum alloy side plates are used in gear pumps, their lower hardness makes them prone to wear due to long-term friction with the gear end faces, leading to increased clearance, internal leakage, and decreased pump efficiency. Simultaneously, aluminum alloy and gears are prone to "adhesive wear," especially under poor lubrication, which can cause the friction surfaces to stick and peel off, resulting in surface scratches on the side plate and affecting the gear pump's performance.

[0003] When a gear pump uses bimetallic side plates made of steel and copper alloy, the oil viscosity increases sharply at low temperatures, resulting in poor fluidity. This makes it difficult for the oil to form an effective lubricating film between the side plate and the gear, leading to dry friction, accelerated wear of the copper alloy layer, uneven frictional heating, localized high-temperature oxidation, side plate burning, and decreased pump efficiency. Because copper alloy has limited self-lubricating properties, its coefficient of friction is high under insufficient oil conditions, especially during high-speed starts in electric vehicles, when the oil has not yet been fully delivered to the end faces of the side plate and gear, resulting in boundary lubrication or even dry friction. Rapid wear of the copper layer on the side plate increases internal leakage, ultimately causing gear pump failure. Utility Model Content

[0004] The purpose of this invention is to overcome the above-mentioned technical deficiencies and provide a wear-resistant coated bimetallic side plate with a simple structure, increased wear resistance, and extended service life of gear pumps.

[0005] The technical solution adopted by this utility model to solve the technical problem is as follows: a wear-resistant coated bimetallic side plate includes a steel layer and a copper alloy layer. The characteristic is that a copper alloy layer is sintered on the surface of the steel layer, and a wear-resistant coating is provided on the surface of the copper alloy layer. The thickness of the wear-resistant coating is 1.5~2.5μm. The hardness of the wear-resistant coating is >2100HV. The coefficient of friction of the wear-resistant coating is 0.05~0.1.

[0006] The beneficial effects of this invention are as follows: The wear-resistant coated bimetallic side plate adds a wear-resistant coating to the surface of the copper alloy layer of the bimetallic side plate, preventing the gear end face from directly contacting the copper alloy layer of the side plate, thus avoiding side plate burning, decreased pump efficiency, rapid wear of the copper alloy layer, increased internal leakage, and gear pump failure. Therefore, even at high starting speeds or in low-temperature winter environments, the side plate possesses self-lubricating properties, high surface hardness, reduced friction coefficient, increased wear resistance, and extended service life of the gear pump. Attached Figure Description

[0007] The following description, in conjunction with the accompanying drawings, illustrates specific embodiments.

[0008] Figure 1 This is the front view of the wear-resistant coated bimetallic side panel structure.

[0009] Figure 2 yes Figure 1 Left sectional view.

[0010] Figure 3 yes Figure 2 Enlarged view of section I in the middle.

[0011] In the diagram: 1 - steel layer; 2 - copper alloy layer; 3 - wear-resistant coating. Detailed Implementation

[0012] For examples, see the appendix. Figures 1-3The steel plate was cleaned, and copper alloy powder was evenly coated onto its surface. It was then placed in a sintering furnace, the temperature was adjusted to the sintering temperature and maintained for a certain time. Finally, it was removed from the furnace and placed in a cold water bath to cool, forming a sintered copper alloy sheet, i.e., a copper alloy layer 2 was sintered onto the surface of steel layer 1. The sintered sheet was then processed into bimetallic side plates through blanking and machining. A wear-resistant coating 3 was then deposited onto the surface of the copper alloy layer 2 of the bimetallic side plate using ion electroplating in a vacuum. Three gear pumps were assembled using side plates with wear-resistant coating 3 thicknesses of 0.7μm, 1.0μm, and 1.5μm, respectively, for testing. The gear pumps were operated in an oil-free state with no oil pipes connected to the inlet and outlet, and the speed was 2100 r / min. The test involved 20 consecutive starts, each run lasting 10 seconds. After the test, the side plates were disassembled and the surface of the side plates was observed. On side plates with a wear-resistant coating thickness of 0.7 μm and 1.0 μm, the coating was worn away in some areas. On side plates with a wear-resistant coating thickness of 1.5 μm, the coating was largely intact. Three gear pumps were assembled using side plates with wear-resistant coating thicknesses of 2 μm, 2.5 μm, and 3.0 μm, respectively. The gear pumps were operated without oil pipes at the inlet and outlet, running at a speed of 2100 r / min for 10 seconds each time, with 20 consecutive starts. After the test, the side plates were disassembled and the surface of the side plates was observed. On side plates with a wear-resistant coating thickness of 2.0 μm and 2.5 μm, the coating was largely intact. On side plates with a wear-resistant coating thickness of 3 μm, the coating peeled off in some areas, with pieces falling off.

[0013] After repeated experiments, when the thickness of the wear-resistant coating 3 was less than 1.5 μm, the coating wore away in some areas. When the coating thickness was greater than 2.5 μm, the excessive thickness caused internal stress concentration and microcracks, making it prone to peeling under external force. Furthermore, the difference in thermal expansion coefficients between the coating and the substrate led to interface separation, localized peeling, and blocky detachment of the coating. Side plates with a wear-resistant coating 3 thickness of 1.5~2.5 μm improved the physical and chemical properties of the workpiece surface with almost no impact on the original dimensions of the workpiece.

[0014] The wear-resistant coating 3 selected in the above test has a hardness >2100HV, which is much higher than that of metal materials. It can maintain a low wear rate even under high load. The coefficient of friction is only 0.05~0.1, which reduces frictional heat and energy consumption and is suitable for high-speed environments. It has good self-lubricating properties and can maintain low friction even if the lubrication is poor, reducing the risk of side plate sintering and gear pump failure caused by dry friction. It is resistant to high temperature and maintains excellent coating adhesion in repeated thermal cycles.

[0015] The working process of the wear-resistant coated bimetallic side plate is as follows: The manufactured wear-resistant coated bimetallic side plate is installed in the gear pump. When the gear pump is working, the gear end face comes into contact with the wear-resistant coating 3 of the side plate and rubs against it. Because the wear-resistant coating 3 has a hardness >2100HV, its surface hardness is high, much higher than that of metal materials, its wear rate is low, and its friction coefficient is only 0.05~0.1, which increases the wear resistance of the side plate and extends the service life of the gear pump. This avoids the gear end face directly contacting the copper alloy layer 2 of the side plate, which could lead to side plate burning, decreased pump efficiency, rapid wear of the copper alloy layer 2, increased internal leakage, and gear pump failure.

Claims

1. A wear-resistant coated bimetallic side plate, comprising a steel layer (1) and a copper alloy layer (2), characterized in that, A copper alloy layer (2) is sintered on the surface of the steel layer (1), and a wear-resistant coating (3) is provided on the surface of the copper alloy layer (2). The thickness of the wear-resistant coating (3) is 1.5~2.5μm, and the hardness of the wear-resistant coating (3) is >2100HV.

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