Metal roller sleeve

Abstract

The utility model relates to the technical field of roller sleeves, in particular to a metal roller sleeve which comprises a high-strength alloy layer, a low-alloy buffer layer, a wear-resistant layer and a stress release groove, the low-alloy buffer layer is connected with the outer surface of the high-strength alloy layer through melting, and the wear-resistant layer is sprayed on the low-alloy buffer layer; the low-alloy buffer layer is connected with the outer surface of the high-strength alloy layer through melting, and the wear-resistant layer is sprayed on the low-alloy buffer layer, so that fatigue cracks caused by welding are avoided; sufficient supporting strength is provided for the metal roller sleeve through the high-strength alloy layer, the influence of impact loads on the high-strength alloy layer is relieved through the low-alloy buffer layer, the abrasion resistance of the metal roller sleeve is improved through the abrasion-resistant layer, stress generated in the working process is released through the stress releasing grooves, and crack propagation caused by stress concentration is prevented. The fatigue resistance of the roller sleeve is improved; according to the roller sleeve, fatigue cracks caused by welding can be avoided, the anti-fatigue performance of the roller sleeve is improved, and the service life of the whole roller sleeve is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of roller sleeve technology, specifically a metal roller sleeve. Background Technology

[0002] The roller sleeve is nested on the roller core, primarily serving to compensate for wear on the roller body. Chinese Patent CN215783726U discloses a metal-ceramic grinding roller sleeve, comprising: a roller sleeve body, an mounting structure, and an inner ring. The roller sleeve body includes an outermost quartz layer, a stainless steel layer located inside the quartz layer, a steel skeleton located inside the stainless steel layer, and an inner anti-wear layer located at the innermost side of the roller sleeve body. By setting up the roller sleeve body, the internal structure of the roller sleeve is replaced. The harder quartz layer replaces wear, the steel skeleton maintains the shape of the entire roller sleeve body to prevent deformation, and the inner anti-wear layer buffers the friction between the roller sleeve body and the inner ring, reducing damage to the roller sleeve body.

[0003] However, in practical applications, the above-mentioned roller sleeve still has the following shortcomings: Since the top insert and the inner liner, the top insert and the connecting plate, the connecting plate and the insert plate, and the inner liner and the bottom insert are all welded, the welded joints are uneven and not strong enough, and the heat-affected zone is large. During long-term use, fatigue cracks are very likely to appear at the welded joints, which reduces the fatigue resistance of the roller sleeve and affects the overall service life of the roller sleeve. Utility Model Content

[0004] The purpose of this invention is to address the above-mentioned shortcomings by providing a metal roller sleeve that avoids fatigue cracks caused by welding, improves the fatigue resistance of the roller sleeve, and extends the overall service life of the roller sleeve.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A metal roller sleeve includes an innermost high-strength alloy layer, a low-alloy buffer layer disposed outside the high-strength alloy layer, and a wear-resistant layer disposed outside the buffer layer. The low-alloy buffer layer has a plurality of stress-relieving grooves uniformly formed in the circumferential direction. The low-alloy buffer layer is connected to the outer surface of the high-strength alloy layer by melting. The wear-resistant layer is sprayed onto the low-alloy buffer layer.

[0007] Furthermore, the high-strength alloy layer has multiple connecting protrusions evenly distributed in the circumferential direction.

[0008] Furthermore, the connecting protrusion is staggered from the stress relief groove.

[0009] Furthermore, the high-strength alloy layer is made of high-strength alloy steel.

[0010] Furthermore, the high-strength alloy steel is manufactured using a centrifugal casting process.

[0011] Furthermore, the low-alloy buffer layer is made of low-alloy steel.

[0012] Furthermore, the wear-resistant layer is a Wc-Co alloy coating.

[0013] Furthermore, the thickness of the wear-resistant layer ranges from 0.5 to 1 mm, and the microhardness reaches 1200 to 1500 HV.

[0014] The beneficial effects of this utility model are:

[0015] In practical applications, because the low-alloy buffer layer is connected to the outer surface of the high-strength alloy layer through melting, and the wear-resistant layer is sprayed on the low-alloy buffer layer, fatigue cracks that occur during welding are avoided. The high-strength alloy layer provides sufficient support strength to the metal roller sleeve, the low-alloy buffer layer alleviates the impact load on the high-strength alloy layer, the wear-resistant layer improves the wear resistance of the metal roller sleeve, and the stress relief groove releases the stress generated during operation to prevent crack propagation caused by stress concentration, thereby improving the fatigue resistance of the roller sleeve. This invention can avoid fatigue cracks that occur during welding, improve the fatigue resistance of the roller sleeve, and extend the overall service life of the roller sleeve. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a side view of the present invention;

[0018] Figure 3 yes Figure 2 Cross-sectional view at point AA;

[0019] Reference numerals: High-strength alloy layer 1; Connecting protrusion 11; Low-alloy buffer layer 2; Stress relief groove 21; Wear-resistant layer 3. Detailed Implementation

[0020] like Figure 1 , Figure 2 and Figure 3 As shown, a metal roller sleeve includes an innermost high-strength alloy layer 1, a low-alloy buffer layer 2 disposed outside the high-strength alloy layer 1, and a wear-resistant layer 3 disposed outside the buffer layer. The low-alloy buffer layer 2 has a plurality of stress-relieving grooves 21 uniformly formed in the circumferential direction. The low-alloy buffer layer 2 is connected to the outer surface of the high-strength alloy layer 1 by melting. The wear-resistant layer 3 is sprayed onto the low-alloy buffer layer 2.

[0021] Because the low-alloy buffer layer 2 is connected to the outer surface of the high-strength alloy layer 1 by melting, and the wear-resistant layer 3 is sprayed on the low-alloy buffer layer 2, fatigue cracks caused by welding are avoided; the high-strength alloy layer 1 provides sufficient support strength to the metal roller sleeve, the low-alloy buffer layer 2 alleviates the impact load on the high-strength alloy layer 1, the wear-resistant layer 3 improves the wear resistance of the metal roller sleeve, and the stress relief groove 21 releases the stress generated during operation to prevent crack propagation caused by stress concentration, thereby improving the fatigue resistance of the roller sleeve; this utility model can avoid fatigue cracks caused by welding, improve the fatigue resistance of the roller sleeve, and extend the overall service life of the roller sleeve.

[0022] like Figure 1 , Figure 2 and Figure 3 As shown, multiple connecting protrusions 11 are evenly distributed in the circumferential direction of the high-strength alloy layer 1; in this embodiment, the multiple connecting protrusions 11 can enhance the connection strength between the low-alloy buffer layer 2 and the high-strength alloy layer 1 after cooling.

[0023] like Figure 1 , Figure 2 and Figure 3 As shown, the connecting protrusion 11 and the stress relief groove 21 are staggered; in this embodiment, when the connecting protrusion 11 and the stress relief groove 21 are staggered, the metal roller sleeve is subjected to more uniform force.

[0024] like Figure 1 , Figure 2 and Figure 3 As shown, the high-strength alloy layer 1 is made of high-strength alloy steel; in this embodiment, the high-strength alloy layer 1 made of high-strength alloy steel has good comprehensive mechanical properties.

[0025] like Figure 1 , Figure 2 and Figure 3 As shown, the high-strength alloy steel is manufactured by centrifugal casting. In this embodiment, the high-strength alloy steel roller sleeve blank manufactured by centrifugal casting can make the molten metal evenly distributed under the action of centrifugal force, reduce casting defects such as shrinkage cavities and porosity, and improve the overall density and mechanical properties of the metal roller sleeve.

[0026] like Figure 1 , Figure 2 and Figure 3 As shown, the low-alloy buffer layer 2 is made of low-alloy steel; in this embodiment, the low-alloy steel with good toughness can alleviate the impact load on the high-strength alloy layer 1 and extend the service life of the bushing.

[0027] like Figure 1 , Figure 2 and Figure 3As shown, the wear-resistant layer 3 is a Wc-Co alloy coating; in this embodiment, Wc (tungsten carbide) has extremely high hardness, which gives the coating excellent wear resistance, and Co (cobalt) serves as a binder phase to ensure that the Wc particles can bond well with the low alloy buffer layer 2.

[0028] like Figure 1 , Figure 2 and Figure 3 As shown, the thickness of the wear-resistant layer 3 ranges from 0.5 to 1 mm, and the microhardness reaches 1200 to 1500 HV. In this embodiment, when the thickness of the wear-resistant layer 3 ranges from 0.5 to 1 mm and the microhardness reaches 1200 to 1500 HV, the wear resistance of the metal roller sleeve can be significantly improved.

[0029] The processing method of the metal roller sleeve described in this application includes: Step 1, vacuum melting high-strength alloy steel and low-alloy steel respectively to improve the purity and uniformity of the materials; Step 2, centrifugally casting high-strength alloy steel to form the high-strength alloy layer 1 into a substrate, which enables the molten metal to be evenly distributed under centrifugal force, reducing casting defects such as shrinkage cavities and porosity, and improving the overall density and mechanical properties of the metal roller sleeve; Step 3, placing the substrate into a mold, injecting molten low-alloy steel, cooling and forming a roller sleeve blank; Step 4, after thermal spraying a Wc-Co alloy coating, performing high-temperature diffusion treatment to form atomic diffusion bonding between the coating and the roller sleeve blank, further improving the bonding strength; Step 5, grinding and polishing the roller sleeve; Step 6, nitriding the surface of the roller sleeve to form a nitrided layer with high hardness and good wear resistance, further extending the service life of the bushing.

[0030] The specific embodiments described herein are merely illustrative examples of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the scope defined by this utility model.

Claims

1. A metal roller sleeve, characterized in that: It includes an innermost high-strength alloy layer, a low-alloy buffer layer disposed outside the high-strength alloy layer, and a wear-resistant layer disposed outside the buffer layer. The low-alloy buffer layer has multiple stress-relieving grooves uniformly formed in the circumferential direction. The low-alloy buffer layer is connected to the outer surface of the high-strength alloy layer by melting. The wear-resistant layer is sprayed onto the low-alloy buffer layer.

2. The metal roller sleeve according to claim 1, characterized in that, The high-strength alloy layer has multiple connecting protrusions evenly distributed along its circumference.

3. A metal roller sleeve according to claim 2, characterized in that, The connecting protrusion is offset from the stress relief groove.

4. A metal roller sleeve according to claim 1, characterized in that, The high-strength alloy layer is made of high-strength alloy steel.

5. A metal roller sleeve according to claim 4, characterized in that, The high-strength alloy steel is manufactured using a centrifugal casting process.

6. A metal roller sleeve according to claim 1, characterized in that, The low-alloy buffer layer is made of low-alloy steel.

7. A metal roller sleeve according to claim 1, characterized in that, The wear-resistant layer is a Wc-Co alloy coating.

8. A metal roller sleeve according to claim 7, characterized in that, The wear-resistant layer has a thickness of 0.5~1mm and a microhardness of 1200~1500HV.

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