Wear-resistant bimetallic plate structure

Abstract

The utility model relates to a wear-resistant bimetallic plate structure which comprises a tungsten-cobalt alloy wear-resistant plate and a steel substrate, and a brazing layer or a high-temperature-resistant epoxy structural adhesive layer is arranged between the tungsten-cobalt alloy wear-resistant plate and the steel substrate. A plurality of bolts are pre-buried in the tungsten-cobalt alloy wear-resisting plate, and one end of each bolt extends to the steel base plate and is pre-tightened through a nut; the embedded depth of the bolt is 1 / 3-1 / 2 of the wall thickness of the tungsten-cobalt alloy wear-resisting plate and is not less than 3 times of the diameter of the bolt; the surface of the bolt is coated with a high-temperature-resistant coating, and the thickness of the high-temperature-resistant coating ranges from 0.1 mm to 0.3 mm. According to the utility model, through the bolt and brazing / cementing composite structure design, the problem that the traditional tungsten-cobalt alloy bimetallic plate is easy to peel off and lose efficacy due to insufficient interface bonding force is solved, the connection strength, reliability and applicability are obviously improved, and the bimetallic plate can stably operate under various complex working conditions.

Description

Technical Field

[0001] This utility model relates to the field of bimetallic plate technology, specifically a wear-resistant bimetallic plate structure. Background Technology

[0002] In modern industrial production, there are extremely high requirements for the wear resistance of various mechanical equipment. Bimetallic plates, as a key material that can significantly improve the wear resistance of equipment, have been widely used in many fields.

[0003] In the field of electric shovel buckets, the harsh operating environment makes the buckets highly susceptible to wear, severely impacting their service life and work efficiency. Applying bimetallic plates to electric shovel buckets effectively increases their wear resistance and reduces equipment wear costs. In sugar mills, hammers face severe wear issues during continuous striking operations; the use of bimetallic plates significantly extends their service life. Similarly, bimetallic plates play a crucial role in components such as chute liners in steel mills and mining companies, as well as side plates (liners) in crushing equipment. By replacing high-manganese castings or alloy castings, they significantly improve the wear resistance of these components, thereby enhancing the overall operational stability and service life of the equipment.

[0004] Currently, bimetallic plates are generally formed using vacuum brazing. When high-chromium cast iron is used as the wear-resistant plate and carbon steel as the substrate, the good wettability of the high-chromium cast iron allows for a metallurgical bond between the bimetallic plates, achieving a weld strength of approximately 150 MPa, which meets the requirements of most applications. However, with the increasing demands for wear resistance in industrial production, serious problems have arisen when tungsten-cobalt alloys (such as YG10 and YG11) are used as the wear-resistant plate, carbon steel as the substrate, and vacuum brazing is still employed. Due to the wettability issues between the tungsten-cobalt alloy and the flux, a metallurgical bond cannot be formed between the bimetallic plates, resulting in unreliable weld strength. In practical applications, the failure mode of such bimetallic plates is mostly spalling rather than wear failure, which severely limits their application in demanding wear-resistant conditions. Therefore, developing a novel technology to solve the bonding problem of tungsten-cobalt alloy bimetallic plates and meet the growing demands of industrial production has become an urgent challenge. Utility Model Content

[0005] To address the aforementioned problems, this utility model provides a wear-resistant bimetallic plate structure that offers a stable connection, improved brazing strength, and meets the operational requirements of complex working conditions.

[0006] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a wear-resistant bimetallic plate structure, including a tungsten cobalt alloy wear-resistant plate and a steel substrate, wherein a brazing layer or a high-temperature resistant epoxy structural adhesive layer is provided between the tungsten cobalt alloy wear-resistant plate and the steel substrate; a plurality of bolts are pre-embedded in the tungsten cobalt alloy wear-resistant plate, one end of each bolt extends to the steel substrate and is pre-tightened by a nut; the surface of the bolt is coated with a high-temperature resistant coating, the thickness of which is 0.1 to 0.3 mm.

[0007] Preferably, the brazing layer is a copper sheet and is vacuum brazed, and the thickness of the copper sheet is 0.2 to 0.5 mm.

[0008] Preferably, the vacuum degree of the vacuum brazing is maintained at 10. -3 -10 -4 Pa, the brazing temperature is 1100-1180℃, the holding time is 10-15 minutes, so that the copper sheet melts and forms a strong connection between the tungsten cobalt alloy wear-resistant plate and the steel substrate.

[0009] Preferably, the thickness of the high-temperature resistant epoxy structural adhesive layer is 0.1-0.3 mm, the pre-curing temperature is 80-120℃, the pre-curing time is 1-2 hours, the high-temperature curing temperature is 120-180℃, and the high-temperature curing time is 2-3 hours.

[0010] Preferably, the pre-embedded depth of the bolt is 1 / 3 to 1 / 2 of the wall thickness of the tungsten cobalt alloy wear-resistant plate and not less than 3 times the bolt diameter.

[0011] Preferably, the high-temperature resistant coating is an alumina-based ceramic coating, which can effectively insulate against high temperatures and prevent the bolts from being damaged during the sintering of the tungsten-cobalt alloy.

[0012] Preferably, the bolt spacing is matched with the prestress of the bimetallic plate.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. This utility model solves the problem of easy peeling failure caused by insufficient interfacial bonding force of traditional tungsten cobalt alloy bimetallic plates through the design of bolt + brazing / adhesion composite structure, significantly improving the connection strength, reliability and applicability, and ensuring that the bimetallic plate can operate stably under various complex working conditions;

[0015] 2. This utility model improves shear strength through the synergistic effect of bolt mechanical locking and brazing / bonding layer, and the shear strength is 30% to 50% higher than that of traditional pure brazing or pure bonding solutions.

[0016] 3. This utility model optimizes the failure mode, changing the failure mode from interface peeling to local fracture of the brazing / bonding layer or substrate wear failure, which meets the design expectations of wear-resistant parts.

[0017] 4. The structural design of this utility model not only enables efficient connection of bimetallic plates using traditional brazing technology, but also allows for synergistic use with structural adhesive. This combination of structure and structural adhesive fully leverages the reinforcing effect of the structure on the connection of bimetallic plates, enabling the bimetallic plates to meet the original requirements for brazed wear-resistant bimetallic plates while further expanding their application range and performance. It also reduces investment in brazing equipment and is suitable for small to medium batch production.

[0018] 5. This utility model allows for partial replacement of the wear-resistant plate through the detachable bolt design, thereby reducing maintenance costs. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0020] Figure 2 This is a top view of the present invention;

[0021] Figure 3 yes Figure 2 Sectional view along the middle AA. Detailed Implementation

[0022] The following will combine Figure 1-3 The present invention will be described in detail below. The illustrative embodiments and descriptions of the present invention are used to explain the present invention, but are not intended to limit the present invention.

[0023] A wear-resistant bimetallic plate structure includes a tungsten-cobalt alloy wear-resistant plate 1 and a steel substrate 2. A brazing layer or a high-temperature resistant epoxy structural adhesive layer is provided between the tungsten-cobalt alloy wear-resistant plate and the steel substrate. Multiple bolts 3 are pre-embedded in the tungsten-cobalt alloy wear-resistant plate, with one end of each bolt extending to the steel substrate and pre-tightened by a nut 4. The pre-embedding depth of the bolts is 1 / 3 to 1 / 2 of the wall thickness of the tungsten-cobalt alloy wear-resistant plate and not less than 3 times the bolt diameter. In special cases, such as thin walls (thickness T ≤ 50 mm), the minimum depth of 3 times the bolt diameter is prioritized to avoid anchoring failure due to insufficient wall thickness. For thick walls (thickness T > 50 mm), the wall thickness ratio is the main consideration, while also taking into account processing costs and structural stability. The bolt spacing is matched with the prestress of the bimetallic plate. The bolt surface is coated with a high-temperature resistant coating with a thickness of 0.1 to 0.3 mm. In this application, the high-temperature resistant coating is an alumina-based ceramic coating.

[0024] Specifically, the brazing layer is a copper sheet and is vacuum brazed, with a copper sheet thickness of 0.2–0.5 mm. The vacuum level for vacuum brazing is maintained at 10. -3 -10 -4Pa, brazing temperature is 1100-1180℃, and holding time is 10-15 minutes.

[0025] The thickness of the high-temperature resistant epoxy structural adhesive layer is 0.1-0.3 mm, the pre-curing temperature is 80-120℃, the pre-curing time is 1-2 hours, the high-temperature curing temperature is 120-180℃, and the high-temperature curing time is 2-3 hours.

[0026] During implementation, bolts are pre-embedded in the tungsten-cobalt alloy blank. Before sintering the blank, the portion of the bolts that will be installed on the steel substrate is coated with a high-temperature resistant coating. During the blank fabrication stage, bolt holes are pre-drilled at predetermined positions on the mold using high-precision drilling equipment, according to the design spacing requirements. The design spacing is determined based on the actual operating conditions and mechanical performance requirements of the wear-resistant plate. The drilled hole diameter is 0.5-0.8 mm larger than the bolt outer diameter to ensure smooth bolt insertion during subsequent installation and to guarantee a certain degree of tightness. After sintering the blank, the portion of the bolts that will be installed on the steel substrate is threaded. The fabricated tungsten-cobalt alloy wear-resistant plate is pre-tightened to the steel substrate using bolts and nuts, and copper sheets or high-temperature resistant epoxy structural adhesive are placed between the interfaces. The assembled components are then placed in a vacuum brazing furnace for brazing. The vacuum level is maintained at 10. -3 -10 -4 The brazing temperature is controlled at 1100-1180℃, and the holding time is 10-15 minutes to melt the copper sheet and form a strong connection between the tungsten cobalt alloy wear-resistant plate and the steel substrate, ultimately obtaining the finished bimetallic plate. The tungsten cobalt alloy bimetallic plate of this application can also be brazed using high-temperature resistant epoxy structural adhesive, while still ensuring good bonding performance.

[0027] This utility model patent solves the problem of easy peeling failure caused by insufficient interfacial bonding force in traditional tungsten cobalt alloy bimetallic plates through a bolt + brazing / adhesion composite structure design, significantly improving connection strength, reliability and applicability.

[0028] The technical solutions provided by the embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the embodiments of this utility model. The description of the above embodiments is only for helping to understand the principles of the embodiments of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the embodiments of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A wear resistant bimetallic plate construction comprising a tungsten cobalt alloy wear plate (1) and a steel base plate (2) characterised in that: The tungsten-cobalt alloy wear-resistant plate is provided with a brazing layer or a high-temperature resistant epoxy structural adhesive layer between the plate and the steel base plate; a plurality of bolts (3) are embedded in the tungsten-cobalt alloy wear-resistant plate, one end of each bolt extends to the steel base plate and is pre-tightened through a nut (4); the bolt surface is coated with a high-temperature resistant coating, and the thickness of the high-temperature resistant coating is 0.1-0.3 mm.

2. The abrasion-resistant bimetallic plate structure of claim 1, wherein: The brazing layer is a copper sheet and is vacuum brazed, and the thickness of the copper sheet is 0.2-0.5 mm.

3. The wear-resistant bimetallic plate structure of claim 2, wherein: The vacuum of the vacuum brazing is kept at 10 -3 -10 -4 Pa, the brazing temperature is 1100-1180℃, and the holding time is 10-15 minutes.

4. The abrasion-resistant bimetallic plate structure of claim 1, wherein: The thickness of the high-temperature resistant epoxy structural adhesive layer is 0.1-0.3 mm, the pre-curing temperature is 80-120℃, the pre-curing time is 1-2 hours, the high-temperature curing temperature is 120-180℃, and the high-temperature curing time is 2-3 hours.

5. The wear resistant bimetallic plate structure of claim 1, wherein: The embedded depth of the bolt is 1 / 3-1 / 2 of the wall thickness of the tungsten-cobalt alloy wear-resistant plate and is not less than 3 times the diameter of the bolt.

6. The abrasion-resistant bimetallic plate structure of claim 1, wherein: The high-temperature resistant coating (6) is an alumina-based ceramic coating.

7. The abrasion-resistant bimetallic plate structure of claim 1, wherein: The bolt spacing is matched with the pre-stress of the bimetallic plate.

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