Bucket tooth of immersion liquid cladding wear-resistant layer

Abstract

According to the bucket tooth of the immersion cladding wear-resistant layer, the immersion cladding wear-resistant layer is characterized in that the part, needing cladding of the wear-resistant layer, of the bucket tooth is immersed in wear-resistant alloy liquid in a furnace to be cladded, and the alloy liquid is adhered to the bucket tooth in a semi-solid and semi-liquid form under the cooling action of the bucket tooth immersed in the alloy liquid, so that the wear-resistant layer is cladded. And the bucket teeth are put into a liquid die forging die to be subjected to extrusion forging forming, pressure maintaining is conducted till the bucket teeth are completely solidified and quenched into quenching liquid to be quenched, or the bucket teeth with the low requirement for the appearance are directly quenched into the quenching liquid to be quenched after being completely solidified.

Description

Technical Field

[0001] A bucket tooth with a liquid-impregnated wear-resistant layer relates to the field of material forming and control engineering technology. Background Technology

[0002] Bucket teeth of loader and excavator are wear-resistant parts that are prone to damage. Castings and forgings made of a single material cannot meet the performance requirements of being both wear-resistant and not easily broken. To improve the wear resistance of bucket teeth, a wear-resistant layer is usually manufactured by welding or laser cladding. However, due to the generation of great residual structural stress and thermal stress, the clad wear-resistant layer is prone to cracking and peeling.

[0003] A bucket tooth with a wear-resistant layer immersed in liquid cladding involves immersing the portion of the bucket tooth's shaped structure that requires the wear-resistant layer to be clad into a molten wear-resistant alloy in a furnace. Under the cooling effect of the bucket tooth immersed in the molten alloy, the alloy adheres to the surface of the bucket tooth in a semi-solid, semi-liquid state. The bucket tooth is then placed in a liquid forging mold for extrusion casting and pressure-held until completely solidified before being quenched in water. Alternatively, for bucket teeth where the surface shape requirements are not high, the teeth can be directly cooled to complete solidification and then quenched in water. Summary of the Invention

[0004] A bucket tooth with a liquid-coated wear-resistant layer is obtained by immersing the portion of the bucket tooth to be coated with the wear-resistant layer into a molten wear-resistant alloy in a furnace. Under the cooling effect of the bucket tooth immersed in the molten alloy, the alloy adheres to the surface of the bucket tooth in a semi-solid, semi-liquid form. The bucket tooth is then placed in a liquid forging mold for extrusion casting and pressure-held until completely solidified before being quenched in water. Alternatively, for bucket teeth with less stringent requirements for surface shape, the bucket tooth can be directly cooled to complete solidification and then quenched in water to obtain a bucket tooth with a liquid-coated wear-resistant layer.

[0005] The forming structure of the bucket teeth to be immersed in the wear-resistant layer has a dimensional allowance for the part to be immersed in the wear-resistant layer, which is beneficial to the forming dimensional accuracy.

[0006] The forming structure of the bucket teeth to be clad with the wear-resistant layer is preheated to 600℃~900℃. The thickness of the cladding wear-resistant layer is controlled by the preheating temperature and immersion time. This also facilitates the formation of a metallurgical bond between the cladding wear-resistant layer and the bucket teeth structure and reduces residual stress.

[0007] The molded structural component of the bucket tooth to be immersed in the wear-resistant layer is pre-plated with a copper alloy layer and then immediately immersed in the wear-resistant alloy liquid in the furnace. This ensures that the wear-resistant layer and the bucket tooth structural component are metallurgically bonded, reduces residual stress, and avoids cracking and peeling of the wear-resistant layer during use.

[0008] During the process of immersing the bucket teeth with the wear-resistant cladding layer into the wear-resistant alloy liquid in the furnace, the medium-frequency electric furnace is kept powered on for heating. This generates electromagnetic stirring in the wear-resistant alloy liquid in the furnace, promoting the wetting of the bucket teeth surface by the wear-resistant alloy liquid to form a metallurgical bond and improving the bonding strength between the cladding wear-resistant layer and the bucket teeth substrate. Specific implementation methods

[0009] Preparation of bucket teeth to be immersed in molten copper alloy for wear-resistant coating: Preheat the formed structural parts of the bucket teeth to be immersed in molten copper alloy for wear-resistant coating to 800℃~900℃, immerse them in molten copper alloy in the furnace to coat a layer of copper alloy, and maintain the temperature of the molten copper alloy until the bucket teeth are removed for molten copper alloy coating.

[0010] Preparation of wear-resistant alloy liquid: Melt the wear-resistant alloy liquid and refine and remove slag.

[0011] Immersion cladding wear-resistant layer: The bucket teeth coated with copper alloy are immersed in the wear-resistant alloy liquid in the furnace. The medium frequency electric furnace is kept powered on for heating, and electromagnetic stirring is generated in the wear-resistant alloy liquid in the furnace to promote the wetting of the bucket teeth surface by the wear-resistant alloy liquid and form a metallurgical bond, thereby improving the bonding strength between the cladding wear-resistant layer and the bucket teeth substrate.

[0012] Liquid forging: The bucket teeth, which are coated with a semi-solid and semi-liquid wear-resistant alloy liquid, are placed into a liquid forging mold and extruded. The pressure is maintained until the wear-resistant alloy is completely solidified. The bucket teeth are then removed and immediately quenched in a quenching liquid to obtain a bucket teeth coated with a wear-resistant layer.

Claims

1. A bucket tooth with a wear-resistant layer immersion cladding, characterized in that the immersion cladding refers to: immersing the part of the bucket tooth to be clad with the wear-resistant layer into the wear-resistant alloy liquid in the furnace to be clad; under the cooling effect of the bucket tooth immersed in the alloy liquid, the alloy liquid adheres to the surface of the bucket tooth in a semi-solid and semi-liquid form; the bucket tooth is then placed in a liquid forging mold for extrusion molding and held under pressure until completely solidified before being quenched in a quenching liquid; or, for bucket teeth with less stringent requirements on surface shape, the bucket tooth is directly cooled to complete solidification and then quenched in a quenching liquid.

2. According to claim 1, the forming structure of the bucket teeth to be impregnated with the wear-resistant layer has a dimensional allowance for the portion to be impregnated with the wear-resistant layer.

3. According to claim 1, the forming structure of the bucket teeth to be immersed in the wear-resistant coating is preheated to 600℃~900℃, which is beneficial to the formation of a metallurgical bond between the wear-resistant coating and the bucket teeth structure and to reduce residual stress.

4. According to claim 1, after the part of the bucket tooth to be immersed in the wear-resistant layer is pre-plated with a copper alloy layer, it is immediately immersed in the wear-resistant alloy liquid in the furnace to ensure that the wear-resistant layer and the bucket tooth structure are metallurgically bonded and to reduce residual stress.

5. According to claim 1, during the process of immersing the bucket teeth of the wear-resistant layer to be coated with the molten wear-resistant alloy in the furnace, the medium-frequency electric furnace is kept powered on for heating, and electromagnetic stirring is generated in the molten wear-resistant alloy in the furnace to promote the wetting of the surface of the bucket teeth by the molten wear-resistant alloy to form a metallurgical bond, thereby improving the bonding strength between the coated wear-resistant layer and the bucket tooth substrate.