CN117816293A - A wear-resistant part and a method for preparing the same - Google Patents

Abstract

The invention discloses a wear-resistant part and a preparation method thereof, wherein the wear-resistant part comprises a roller sleeve body, a grinding part is arranged on the roller sleeve body, one end of the grinding part is arranged in the roller sleeve body, and the other end of the grinding part is arranged at one side of the outer peripheral wall of the roller sleeve body; the grinding piece comprises a plurality of first grinding parts and a plurality of second grinding parts, and the first grinding parts and the second grinding parts are respectively and correspondingly arranged on the upper part and the lower part of the circumferential side wall of the roller sleeve body so as to form a rough grinding part and a fine grinding part on the roller sleeve body. According to the technical scheme, ceramic particles are used as materials to manufacture the corresponding wear-resistant layer, wherein the roller sleeve body is used as a framework, a plurality of grinding parts made of ceramic particle materials are arranged on the roller sleeve body, meanwhile, the circumferential wall of the whole roller sleeve is divided into a fine grinding part and a rough grinding part according to actual conditions, and the grinding parts with different specifications and sizes are respectively arranged on the fine grinding part and the rough grinding part, so that pulverized coal of the fine grinding part can be further refined, and the coal grinding effect is improved.

Description

A wear-resistant part and a method for preparing the same

Technical Field

The invention relates to the technical field of coal mills, and in particular to a wear-resistant part and a preparation method thereof.

Background technique

As the power market requires coal-fired units to accelerate the application of energy-saving and low-carbon technologies in high-energy-consuming industries, higher requirements are placed on the pulverizing system. At present, most of the coal is burned with low-quality coal, the wear parts of the coal mill are worn out, the wear parts are frequently welded, and the maintenance workload is large. With the change of wear of the wear parts, the grinding force changes greatly. In the long run, there is insufficient supply of pulverized coal, resulting in low boiler efficiency and other problems.

Summary of the invention

The main purpose of the present invention is to provide a wear-resistant part and a preparation method thereof, aiming to solve the problem that the conventional coal mill roller sleeve has poor wear resistance, resulting in frequent maintenance and affecting production.

To achieve the above object, the wear-resistant part proposed by the present invention comprises:

The roller sleeve body is provided with a first portion and a second portion along its axial direction; and

The grinding piece includes a plurality of first grinding parts and a plurality of second grinding parts, wherein one ends of the plurality of first grinding parts and the plurality of second grinding parts are respectively installed inside the first part and the second part, and the other ends of the plurality of first grinding parts and the plurality of second grinding parts are respectively located outside the peripheral walls of the first part and the second part, so as to form a coarse grinding area and a fine grinding area at the first part and the second part respectively.

Preferably, the roller sleeve body includes an installation base, and the installation base is provided with a first installation part and a second installation part corresponding to the first part and the second part, and a plurality of the first grinding parts and a plurality of the second grinding parts are respectively installed on the first mounting part and the second mounting part correspondingly.

Preferably, the outer peripheries of the first mounting portion and the second mounting portion are coated with a fixing layer;

A ceramic grinding layer is provided on the outer side of the fixed layer corresponding to one side of the outer peripheral wall of the roller sleeve body;

One end of each of the plurality of first grinding parts and the plurality of second grinding parts is arranged outside the ceramic grinding layer; the outer periphery of the first mounting part and the second mounting part is covered with a fixing layer;

A ceramic grinding layer is provided on the outer side of the fixed layer corresponding to one side of the outer peripheral wall of the roller sleeve body;

One end portion of the plurality of first grinding portions and one end portion of the plurality of second grinding portions are all arranged outside the ceramic grinding layer.

Preferably, the first mounting portion and the second mounting portion are each provided with a plurality of mounting holes that are evenly spaced, one ends of the plurality of first grinding portions and the plurality of second grinding portions are respectively correspondingly installed in the plurality of mounting holes on the first mounting portion and the second mounting portion, and a fixing component is provided at the mounting holes to fix one end of the first grinding portion and the second grinding portion corresponding to the mounting hole.

Preferably, the first grinding part and the second grinding part are both configured as regular polygonal cylinders, the circumscribed circle radius of the first grinding part is 12-15 mm, the circumscribed circle radius of the second grinding part is 5-8 mm, and the distance between two adjacent second grinding parts is smaller than the distance between two adjacent first grinding parts; and/or,

The thickness of the ceramic grinding layer is 10-25 mm, and the thickness of the fixing layer is 15-30 mm.

Preferably, the aperture of the opening end of the mounting hole is smaller than the aperture of the inner cavity thereof;

The fixing assembly comprises:

A fixing liquid, a plurality of notches are provided on the periphery of one end of the first grinding part and the second grinding part corresponding to the mounting hole, and the fixing liquid is filled in the mounting hole and the notches correspondingly; and,

A fixing bolt is installed at the installation hole, and one end of the first grinding part and the second grinding part are both provided with a threaded hole corresponding to the fixing bolt.

Preferably, a mounting rib is provided on the annular end of the second mounting portion, an adapting groove matching the mounting rib is provided at one end of the first mounting portion, and the mounting rib is fixed in the adapting groove by a bolt member; and/or,

The first mounting portion and the second mounting portion are both integrally cast metal structure prefabricated parts; and/or,

One end of the first grinding part and one end of the second grinding part are both higher than the ceramic grinding layer by 4 to 6 mm.

The present invention also provides a method for preparing a wear-resistant part, which is used for preparing the wear-resistant part. The method for preparing the wear-resistant part comprises the following steps:

S1: Ceramic particles with a diameter of 4 to 30 meshes are mixed with titanium carbide fine powder and a binder, and the mixed materials are placed in a preform mold, and the preform mold is transferred to a high-temperature resistance furnace, and the temperature is slowly increased to 500 to 600° C., and the temperature is kept for 3 hours for heating and molding to form a ceramic particle preform with a particle size of 2 to 4 mm;

S2: preheating the grinding tool of the grinding part to 500°C, placing the ceramic particle preform into the grinding part mold after the heating is completed, injecting molten alloy iron at 1600-1650°C into the mold, and then maintaining the pressure of the grinding part mold for 5-10 minutes;

S3: when the temperature in the grinding part mold drops to 500-600°C, the first grinding part and the second grinding part formed in the grinding part mold are taken out and quickly placed in a heat treatment furnace, the furnace temperature of the heat treatment furnace is set to 1000°C, after keeping the temperature for 12 hours, the first grinding part and the second grinding part are allowed to drop to 200°C along with the furnace temperature, and then taken out of the furnace and naturally cooled to room temperature;

S4: The prefabricated first mounting part and the second mounting part are connected and fixed into a whole by bolts, and then the first grinding part and the second grinding part are respectively installed in the mounting holes on the first mounting part and the second mounting part by the fixing bolts;

S5: injecting alloy iron liquid at 1540-1590° C. into the mounting hole, and making the alloy iron liquid level 2-5 mm higher than the mounting hole opening. After the pouring is completed, waiting for the alloy iron liquid in the mounting hole to cool naturally to room temperature;

S6: placing the roller sleeve body with the first grinding part and the second grinding part fixed thereon into a casting mold, injecting alloy iron liquid at 1540-1590°C into the casting mold, and pressurizing it, maintaining the pressure for 4-6 minutes, and when the temperature in the casting mold drops to 700-800°C, opening the mold, and quickly placing the semi-finished product after forming into a heat treatment furnace, wherein the furnace temperature of the heat treatment furnace is set to 1000°C, and after keeping the temperature for 5 hours, the semi-finished product is allowed to drop to 200°C along with the furnace temperature, and then taken out of the furnace and naturally cooled to room temperature to form the fixed layer;

S7: preheating the ceramic layer mold to 500°C, placing the semi-finished product into the ceramic layer mold, placing the ceramic particle preform into the cavity of the ceramic layer mold, and then injecting 1600-1650°C alloy iron liquid into the cavity of the ceramic layer mold, and pressurizing it, maintaining the pressure for 4-6 minutes, and when the temperature in the casting mold drops to 500-600°C, opening the mold, and quickly placing the formed grinding roller sleeve into a heat treatment furnace, the furnace temperature of the heat treatment furnace is set to 1000°C, and after keeping warm for 12 hours, the semi-finished product is allowed to drop to 200°C along with the furnace temperature, and then taken out of the furnace and naturally cooled to room temperature to form the ceramic grinding layer;

S8: Processing the length of the exposed ends of the first grinding part and the second grinding part so that the exposed ends are 4 to 6 mm higher than the ceramic grinding layer.

Preferably, the alloy iron liquid has a metal element content of 22% to 35%, and the metal elements include copper, nickel, molybdenum, chromium, and iron, wherein the alloy iron liquid also contains 2% to 4% carbon.

Preferably, the ceramic particles are composed of TiO2, Fe2O3, SiO2 and Al2O3.

In the technical solution of the present invention, ceramic particles are used as materials to manufacture the corresponding wear-resistant layer, and the grinding roller sleeve is set as a multi-layer structure, wherein the roller sleeve body is used as a skeleton, and a plurality of grinding parts made of ceramic particle material are arranged on the roller sleeve body, which further improves the wear resistance of the entire grinding roller sleeve. At the same time, the circumferential wall of the entire grinding roller sleeve is divided into a fine grinding part and a coarse grinding part according to actual conditions, and grinding parts of different sizes are respectively arranged on the fine grinding part and the coarse grinding part. In the process of coal grinding by the whole machine, the coal powder in the fine grinding part can be further refined, thereby effectively improving the coal grinding effect.

In addition, in the preparation scheme of the grinding roller sleeve, the roller sleeve body is installed in a combined manner, and the first mounting part and the second mounting part can be made into prefabricated parts for direct use during the actual production process, which is more convenient. At the same time, the multi-layer fixing effect not only effectively improves the fixing effect of the grinding part, but also improves the overall strength of the entire grinding roller sleeve, and has a good application prospect.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

FIG1 is a schematic diagram of the three-dimensional structure of an embodiment of a wear-resistant part provided by the present invention;

FIG2 is a cross-sectional structure of the wear-resistant part in FIG1 ;

FIG3 is a partial enlarged view of point A in FIG2;

FIG4 is a structural diagram of the first grinding section and the second grinding section in FIG1 ;

FIG5 is a diagram showing the installation structure of the first installation portion and the second installation portion in FIG1 ;

FIG. 6 is a flow chart of a method for preparing the wear-resistant part in FIG. 1 .

Description of Figure Numbers:

Label name Label name 1000 Wear parts 2 Fixed layer 1 Roller sleeve body 3 Ceramic grinding layer 11 Install the base 4 First grinding section 111 First installation part 5 Second grinding section 1111 Adapter slot 51 Threaded hole 112 Second installation part 52 gap 1121 Installation 6 Fixative 12 Mounting holes 7 Fixing bolts

The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings.

Detailed ways

The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

As the power market requires coal-fired units to accelerate the application of energy-saving and low-carbon technologies in high-energy-consuming industries, higher requirements are placed on the pulverizing system. At present, most of the coal is burned with low-quality coal, the wear parts of the coal mill are worn out, the wear parts are frequently welded, and the maintenance workload is large. With the change of wear of the wear parts, the grinding force changes greatly. In the long run, there is insufficient supply of pulverized coal, resulting in low boiler efficiency and other problems.

In order to solve the above problems, the present invention proposes a wear-resistant part and a method for preparing the same. FIG. 1 to FIG. 6 are schematic structural diagrams of an embodiment of a wear-resistant part and a method for preparing the same provided by the present invention.

Please refer to Figures 1 to 5. The present invention proposes a wear-resistant part 1000. In this embodiment, the wear-resistant part 1000 includes a roller sleeve body 1, and a first grinding part 4 and a second grinding part 5 are provided on the roller sleeve body 1. In the actual coal grinding process, the grinding roller sleeve is installed obliquely inside the coal mill. When the driving device drives the roller sleeve body 1 to rotate, the arc-shaped side wall of the roller sleeve body 1 will contact the coal block and grind it finely. In this process, as the coal block is refined, it moves from one side of the roller sleeve body 1 to the other side, so it is usually divided into coarse grinding and fine grinding along the axial direction of the roller sleeve body 1. The roller sleeve body 1 comprises two parts: a rough grinding zone and a fine grinding zone. Specifically, the coal block is coarsely ground on one side of the roller sleeve body 1 and then moves to the other side of the roller sleeve body 1 for fine grinding. The coal powder after fine grinding moves upward with the hot air and is collected. In this embodiment, in order to further improve the coal grinding efficiency and effect of the fine grinding zone and the coarse grinding zone, the above two grinding parts are arranged in the corresponding grinding areas, wherein one end of the first grinding part 4 and the second grinding part 5 are both higher than one side of the circumferential side wall of the roller sleeve body 1 to increase the contact area with the coal block, thereby further improving the coal block refining effect and efficiency of the roller sleeve body 1.

At the same time, the first grinding part 4 and the second grinding part 5 are made of ceramic material, which strengthens the overall strength of the grinding parts and improves the wear resistance of the entire roller sleeve body 1.

Among them, the roller sleeve body 1 is a multi-layer structure, the middle layer of which is the mounting base layer 11, the mounting base layer 11 is configured as two parts, a first mounting part 111 and a second mounting part 112, the first grinding part 4 and the second grinding part 5 are installed corresponding to the first mounting part 111 and the second mounting part 112 respectively, so as to form two working areas of fine grinding and coarse grinding on the roller sleeve body 1.

In this embodiment, after the first grinding part 4 and the second grinding part 5 are installed, in order to increase the fixing strength of the internal skeleton of the roller sleeve body 1, a fixing layer 2 is provided on the periphery of the first mounting part 111 and the second mounting part 112 to strengthen the overall strength thereof, and at the same time, the positions of the first grinding part 4 and the second grinding part 5 are further fixed, and a ceramic grinding layer 3 is provided on the periphery of the fixing layer 2 to further improve the peripheral strength of the roller sleeve body 1. The fixing layer 2 and the ceramic grinding layer 3 are both integrally cast. During the casting process, it is necessary to ensure that the outward end of the first grinding part 4 and the second grinding part 5 is 4 to 6 mm higher than the ceramic grinding layer. Specifically, after the pouring is completed, the length of the leakage end can be processed. After the processing is completed, not only the contact strength of the leakage end when contacting the coal block can be guaranteed, but also the stability of its movement and the consistency of the coal output size can be guaranteed.

The radius of the circumscribed circle of the first grinding part 4 is 12-15 mm, and the radius of the circumscribed circle of the second grinding part 5 is 5-8 mm.

Specifically, a plurality of mounting holes 12 are provided on the first mounting portion 111 and the second mounting portion 112 to mount the first grinding portion 4 and the second grinding portion 5. During installation, one end of the first grinding portion 4 and the plurality of second grinding portions 5 are respectively mounted in the plurality of mounting holes 12 on the first mounting portion 111 and the second mounting portion 112, and then one end of the first grinding portion 4 and the second grinding portion 5 are fixedly mounted in the mounting holes 12 through fixing components at the mounting holes 12, thereby completing the installation of the first grinding portion 4 and the second grinding portion 5. After the installation is completed, the grinding portion and the roller sleeve body 1 can form a whole to constitute the internal skeleton of the grinding roller sleeve.

Among them, the preparation materials and methods of the first grinding member and the second grinding member are the same, and the two have the same installation method. In order to form two different grinding effects on the first mounting part 111 and the second mounting part 112, the transverse cross-section of the second grinding part 5 is smaller than the transverse cross-section of the first grinding part 4. At the same time, after the second grinding part 5 is installed, the multiple second grinding parts 5 are installed in a more dense state. The extension distance of the two is the same, specifically set to be 4 to 6 mm higher than the outside of the ceramic grinding layer 3. During the rotation of the roller sleeve body 1, a coarse grinding area and a fine grinding area are formed on the upper and lower parts of its circumferential wall. The first grinding part 4 can fully contact with the coal block during the coarse grinding process to accelerate the crushing of the coal block. At the same time, the second grinding part 5 in the fine grinding area is relatively dense, which can further improve the degree of coal powder refinement.

Because the force exerted by the roller sleeve body 1 when in contact with the coal block is relatively large, in order to further enhance the fixing effect of the first grinding part 4 and the second grinding part 5 and ensure the consistency of the distance between the two adjacent grinding parts after installation, the first grinding part 4 and the second grinding part 5 need to be fixed at their ends by the fixing bolts 7 installed at the mounting hole 12 when installing. After the installation is completed, a fixing agent 6 is injected into the mounting hole 12 at the open end of the mounting hole 12. After the fixing agent 6 is fully injected, it forms a solid shape. At this time, a connecting structure for connecting the notch 52 and the inner cavity of the mounting hole 12 is formed inside the mounting hole 12. At the same time, since the aperture of the open end of the mounting hole 12 is smaller than the aperture of its inner cavity, the fixing agent 6 will not fall off from the mounting hole 12 after curing, which further enhances the fixing effect of the first grinding part 4 and the second grinding part 5 and ensures that the first grinding part 4 and the second grinding part 5 will not loosen or fall off during the strong contact between the roller sleeve body 1 and the coal block.

The fixing agent 6 is a high temperature resistant material that can be molten when heated and solidified when cooled, and can be preferably an alloy metal solution, such as alloy iron solution.

In the present embodiment, the first mounting portion 111 and the second mounting portion 112 are configured as detachable and fixed mounting structures, mainly because the first mounting portion 111 and the second mounting portion 112 can be configured as prefabricated parts, which can be prefabricated before production and directly assembled when used. Combined with the ring-mounted tire structure of the roller sleeve body 1, if the roller sleeve body 1 is prefabricated by an integrated casting process, the demolding process of the inner ring structure is relatively difficult to operate. In the present solution, the roller sleeve body 1 is separated along the highest arc line of its circumferential side wall. Whether it is integrated casting or extrusion molding, a good demolding effect can be achieved, thereby helping to improve the convenience of its production.

The present invention further provides a method for preparing a wear-resistant part. Referring to FIG. 1 to FIG. 6 , in order to better illustrate the method for preparing a wear-resistant part according to an embodiment of the present invention, further examples are given below.

Example 1

The present invention also provides a method for preparing a wear-resistant part, wherein the method is used for preparing the wear-resistant part, and the method for preparing the wear-resistant part comprises the following steps:

S1: Ceramic particles with a diameter of 4 to 30 meshes (the ceramic particles in this embodiment are composed of TiO2, Fe2O3, SiO2 and Al2O3) are mixed with titanium carbide fine powder and a binder, and the mixed materials are placed in a preform mold, and the preform mold is transferred to a high-temperature resistance furnace, and the temperature is slowly increased to 500° C., and the temperature is kept for 3 hours for heating and molding to form a ceramic particle preform with a particle size of 2 mm;

S2: preheating the grinding tool of the grinding part to 500°C, placing the ceramic particle preform into the grinding part mold after heating, injecting 1600°C alloy iron liquid into the mold (the metal element content of the alloy iron liquid in this embodiment is 22% to 35%, and the metal elements include copper, nickel, molybdenum, chromium, and iron, wherein the alloy iron liquid also contains 2% to 4% carbon content), and then maintaining the pressure of the grinding part mold for 5 minutes;

S3: when the temperature in the grinding part mold drops to 500°C, the first grinding part and the second grinding part formed in the grinding part mold are taken out and quickly placed in a heat treatment furnace, the furnace temperature of the heat treatment furnace is set to 1000°C, after keeping the temperature for 12 hours, the first grinding part and the second grinding part are allowed to drop to 200°C along with the furnace temperature, and then taken out of the furnace and naturally cooled to room temperature;

S4: The prefabricated first mounting part and the second mounting part are connected and fixed into a whole by bolts, and then the first grinding part and the second grinding part are respectively installed in the mounting holes on the first mounting part and the second mounting part by the fixing bolts;

S5: injecting molten alloy iron at 1540° C. into the mounting hole, and making the level of the molten alloy iron 2 mm higher than the opening of the mounting hole. After the pouring is completed, waiting for the molten alloy iron in the mounting hole to cool naturally to room temperature;

S6: placing the roller sleeve body with the first grinding part and the second grinding part fixed thereon into a casting mold, injecting 1540°C alloy iron liquid into the casting mold, and pressurizing it, maintaining the pressure for 4 minutes, and when the temperature in the casting mold drops to 700°C, opening the mold, and quickly placing the semi-finished product after forming into a heat treatment furnace, wherein the furnace temperature of the heat treatment furnace is set to 1000°C, and after keeping the temperature for 5 hours, the semi-finished product is allowed to drop to 200°C along with the furnace temperature, and then taken out of the furnace and naturally cooled to room temperature to form the fixed layer;

S7: preheating the ceramic layer mold to 500°C, placing the semi-finished product into the ceramic layer mold, placing the ceramic particle preform into the cavity of the ceramic layer mold, and then injecting 1600°C alloy iron liquid into the cavity of the ceramic layer mold, and pressurizing it, maintaining the pressure for 4 minutes, and when the temperature in the casting mold drops to 500°C, opening the mold, and quickly placing the formed grinding roller sleeve into a heat treatment furnace, the furnace temperature of the heat treatment furnace is set to 1000°C, and after keeping warm for 12 hours, the semi-finished product is allowed to drop to 200°C along with the furnace temperature, and then taken out of the furnace and naturally cooled to room temperature to form the ceramic grinding layer;

S8: Processing the length of the exposed ends of the first grinding part and the second grinding part so that the exposed ends are 4 mm higher than the ceramic grinding layer.

Example 2

The present invention also provides a method for preparing a wear-resistant part, which is used for preparing the wear-resistant part. The method for preparing the wear-resistant part comprises the following steps:

S1: Ceramic particles with a diameter of 4 to 30 meshes (the ceramic particles in this embodiment are composed of TiO2, Fe2O3, SiO2 and Al2O3) are mixed with titanium carbide fine powder and a binder, and the mixed materials are placed in a preform mold, and the preform mold is transferred to a high-temperature resistance furnace, and the temperature is slowly increased to 550° C., and the temperature is kept for 3 hours for heating and molding to form a ceramic particle preform with a particle size of 3 mm;

S2: preheating the grinding tool of the grinding part to 500°C, placing the ceramic particle preform into the grinding part mold after heating, injecting 1625°C alloy iron liquid into the mold (the metal element content of the alloy iron liquid in this embodiment is 22% to 35%, and the metal elements include copper, nickel, molybdenum, chromium, and iron, wherein the alloy iron liquid also contains 2% to 4% carbon content), and then maintaining the pressure of the grinding part mold for 7 minutes;

S3: When the temperature in the grinding part mold drops to 550°C, the first grinding part and the second grinding part formed in the grinding part mold are taken out and quickly placed in a heat treatment furnace, the furnace temperature of the heat treatment furnace is set to 1000°C, and after keeping the temperature for 12 hours, the first grinding part and the second grinding part are allowed to drop to 200°C along with the furnace temperature, and then taken out of the furnace and naturally cooled to room temperature;

S4: The prefabricated first mounting part and the second mounting part are connected and fixed into a whole by bolts, and then the first grinding part and the second grinding part are respectively installed in the mounting holes on the first mounting part and the second mounting part by the fixing bolts;

S5: injecting molten alloy iron at 1565° C. into the mounting hole, and making the level of the molten alloy iron 3.5 mm higher than the opening of the mounting hole. After the pouring is completed, waiting for the molten alloy iron in the mounting hole to cool naturally to room temperature;

S6: placing the roller sleeve body with the first grinding part and the second grinding part fixed thereon into a casting mold, injecting 1565°C alloy iron liquid into the casting mold, and pressurizing it, maintaining the pressure for 5 minutes, and when the temperature in the casting mold drops to 750°C, opening the mold, and quickly placing the semi-finished product after forming into a heat treatment furnace, wherein the furnace temperature of the heat treatment furnace is set to 1000°C, and after keeping the temperature for 5 hours, the semi-finished product is allowed to drop to 200°C along with the furnace temperature, and then taken out of the furnace and naturally cooled to room temperature to form the fixed layer;

S7: preheating the ceramic layer mold to 500°C, placing the semi-finished product into the ceramic layer mold, placing the ceramic particle preform into the cavity of the ceramic layer mold, and then injecting 1625°C alloy iron liquid into the cavity of the ceramic layer mold, and pressurizing it, maintaining the pressure for 5 minutes, and when the temperature in the casting mold drops to 550°C, opening the mold, and quickly placing the formed grinding roller sleeve into a heat treatment furnace, the furnace temperature of the heat treatment furnace is set to 1000°C, and after keeping warm for 12 hours, the semi-finished product is allowed to drop to 200°C along with the furnace temperature, and then taken out of the furnace and naturally cooled to room temperature to form the ceramic grinding layer;

S8: Processing the length of the exposed ends of the first grinding part and the second grinding part so that the exposed ends are 5 mm higher than the ceramic grinding layer.

Example 3

The present invention also provides a method for preparing a wear-resistant part, which is used for preparing the wear-resistant part. The method for preparing the wear-resistant part comprises the following steps:

S1: Ceramic particles with a diameter of 4 to 30 meshes (the ceramic particles in this embodiment are composed of TiO2, Fe2O3, SiO2 and Al2O3) are mixed with titanium carbide fine powder and a binder, and the mixed materials are placed in a preform mold, and the preform mold is transferred to a high-temperature resistance furnace, and the temperature is slowly increased to 600° C., and the temperature is kept for 3 hours for heating and molding to form a ceramic particle preform with a particle size of 4 mm;

S2: preheating the grinding tool of the grinding part to 500°C, placing the ceramic particle preform into the grinding part mold after heating, injecting 1650°C alloy iron liquid into the mold (the metal element content of the alloy iron liquid in this embodiment is 22% to 35%, and the metal elements include copper, nickel, molybdenum, chromium, and iron, wherein the alloy iron liquid also contains 2% to 4% carbon content), and then maintaining the pressure of the grinding part mold for 10 minutes;

S3: When the temperature in the grinding part mold drops to 600°C, the first grinding part and the second grinding part formed in the grinding part mold are taken out and quickly placed in a heat treatment furnace, the furnace temperature of the heat treatment furnace is set to 1000°C, and after keeping the temperature for 12 hours, the first grinding part and the second grinding part are allowed to drop to 200°C along with the furnace temperature, and then taken out of the furnace and naturally cooled to room temperature;

S4: The prefabricated first mounting part and the second mounting part are connected and fixed into a whole by bolts, and then the first grinding part and the second grinding part are respectively installed in the mounting holes on the first mounting part and the second mounting part by the fixing bolts;

S5: injecting molten alloy iron at 1590° C. into the mounting hole, and making the level of the molten alloy iron 5 mm higher than the opening of the mounting hole. After the pouring is completed, waiting for the molten alloy iron in the mounting hole to cool naturally to room temperature;

S6: placing the roller sleeve body with the first grinding part and the second grinding part fixed thereon into a casting mold, injecting 1590°C alloy iron liquid into the casting mold, and pressurizing it, maintaining the pressure for 6 minutes, and when the temperature in the casting mold drops to 800°C, opening the mold, and quickly placing the semi-finished product after forming into a heat treatment furnace, wherein the furnace temperature of the heat treatment furnace is set to 1000°C, and after keeping the temperature for 5 hours, the semi-finished product is allowed to drop to 200°C along with the furnace temperature, and then taken out of the furnace and naturally cooled to room temperature to form the fixed layer;

S7: preheating the ceramic layer mold to 500°C, placing the semi-finished product into the ceramic layer mold, placing the ceramic particle preform into the cavity of the ceramic layer mold, and then injecting 1650°C alloy iron liquid into the cavity of the ceramic layer mold, and pressurizing it, maintaining the pressure for 6 minutes, and when the temperature in the casting mold drops to 600°C, opening the mold, and quickly placing the formed grinding roller sleeve into a heat treatment furnace, the furnace temperature of the heat treatment furnace is set to 1000°C, and after keeping warm for 12 hours, the semi-finished product is allowed to drop to 200°C along with the furnace temperature, and then taken out of the furnace and naturally cooled to room temperature to form the ceramic grinding layer;

S8: Processing the length of the exposed ends of the first grinding part and the second grinding part so that the exposed ends are 6 mm higher than the ceramic grinding layer.

The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly/indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims (10)

1. A wear-resistant part, characterized by comprising: The roller sleeve body is provided with a first portion and a second portion along its axial direction; and The grinding piece includes a plurality of first grinding parts and a plurality of second grinding parts, wherein one ends of the plurality of first grinding parts and the plurality of second grinding parts are respectively installed inside the first part and the second part, and the other ends of the plurality of first grinding parts and the plurality of second grinding parts are respectively located outside the peripheral walls of the first part and the second part, so as to form a coarse grinding area and a fine grinding area at the first part and the second part respectively. 2. The wear-resistant part according to claim 1 is characterized in that the roller sleeve body includes a mounting base, and the mounting base is provided with a first mounting part and a second mounting part corresponding to the first part and the second part, and a plurality of the first grinding parts and a plurality of the second grinding parts are respectively installed on the first mounting part and the second mounting part. 3. The wear-resistant part according to claim 2, wherein the outer peripheries of the first mounting portion and the second mounting portion are coated with a fixing layer; A ceramic grinding layer is provided on the outer side of the fixed layer corresponding to one side of the outer peripheral wall of the roller sleeve body; One end of each of the plurality of first grinding parts and the plurality of second grinding parts is arranged outside the ceramic grinding layer; the outer periphery of the first mounting part and the second mounting part is covered with a fixing layer; A ceramic grinding layer is provided on the outer side of the fixed layer corresponding to one side of the outer peripheral wall of the roller sleeve body; One end portion of the plurality of first grinding portions and one end portion of the plurality of second grinding portions are all arranged outside the ceramic grinding layer. 4. The wear-resistant part according to claim 2 is characterized in that the first mounting portion and the second mounting portion are each provided with a plurality of mounting holes with uniform intervals, one ends of the plurality of first grinding portions and the plurality of second grinding portions are respectively correspondingly mounted in the plurality of mounting holes on the first mounting portion and the second mounting portion, and a fixing component is provided at the mounting holes to fix one end of the first grinding portion and the second grinding portion corresponding to the mounting hole. 5. The wear-resistant part according to claim 3, characterized in that the first grinding part and the second grinding part are both set as regular polygonal cylinders, the radius of the circumscribed circle of the first grinding part is 12-15 mm, the radius of the circumscribed circle of the second grinding part is 5-8 mm, and the distance between two adjacent second grinding parts is smaller than the distance between two adjacent first grinding parts; and/or, The thickness of the ceramic grinding layer is 10-25 mm, and the thickness of the fixing layer is 15-30 mm. 6. The wear-resistant part according to claim 3, characterized in that the aperture of the opening end of the mounting hole is smaller than the aperture of the inner cavity thereof; The fixing assembly comprises: A fixing liquid, a plurality of notches are provided on the periphery of one end of the first grinding part and the second grinding part corresponding to the mounting hole, and the fixing liquid is filled in the mounting hole and the notches correspondingly; and, A fixing bolt is installed at the installation hole, and one end of the first grinding part and the second grinding part are both provided with a threaded hole corresponding to the fixing bolt. 7. The wear-resistant part according to claim 5, characterized in that a mounting rib is provided on the annular end of the second mounting portion, an adapting groove matching the mounting rib is provided at one end of the first mounting portion, and the mounting rib is fixed in the adapting groove by a bolt member; and/or, The first mounting portion and the second mounting portion are both integrally cast metal structure prefabricated parts; and/or, One end of the first grinding part and one end of the second grinding part are both higher than the ceramic grinding layer by 4 to 6 mm. 8. A method for preparing a wear-resistant part, for preparing the wear-resistant part according to any one of claims 1 to 7, characterized in that the method for preparing the wear-resistant part comprises the following steps: S1: Ceramic particles with a diameter of 4 to 30 meshes are mixed with titanium carbide fine powder and a binder, and the mixed materials are placed in a preform mold, and the preform mold is transferred to a high-temperature resistance furnace, and the temperature is slowly increased to 500 to 600° C., and the temperature is kept for 3 hours for heating and molding to form a ceramic particle preform with a particle size of 2 to 4 mm; S2: preheating the grinding tool of the grinding part to 500°C, placing the ceramic particle preform into the grinding part mold after the heating is completed, injecting molten alloy iron at 1600-1650°C into the mold, and then maintaining the pressure of the grinding part mold for 5-10 minutes; S3: when the temperature in the grinding part mold drops to 500-600°C, the first grinding part and the second grinding part formed in the grinding part mold are taken out and quickly placed in a heat treatment furnace, the furnace temperature of the heat treatment furnace is set to 1000°C, after keeping the temperature for 12 hours, the first grinding part and the second grinding part are allowed to drop to 200°C along with the furnace temperature, and then taken out of the furnace and naturally cooled to room temperature; S4: The prefabricated first mounting part and the second mounting part are connected and fixed into a whole by bolts, and then the first grinding part and the second grinding part are respectively installed in the mounting holes on the first mounting part and the second mounting part by the fixing bolts; S5: injecting alloy iron liquid at 1540-1590° C. into the mounting hole, and making the alloy iron liquid level 2-5 mm higher than the mounting hole opening. After the pouring is completed, waiting for the alloy iron liquid in the mounting hole to cool naturally to room temperature; S6: placing the roller sleeve body with the first grinding part and the second grinding part fixed thereon into a casting mold, injecting alloy iron liquid at 1540-1590°C into the casting mold, and pressurizing it, maintaining the pressure for 4-6 minutes, and when the temperature in the casting mold drops to 700-800°C, opening the mold, and quickly placing the semi-finished product after forming into a heat treatment furnace, wherein the furnace temperature of the heat treatment furnace is set to 1000°C, and after keeping the temperature for 5 hours, the semi-finished product is allowed to drop to 200°C along with the furnace temperature, and then taken out of the furnace and naturally cooled to room temperature to form the fixed layer; S7: preheating the ceramic layer mold to 500°C, placing the semi-finished product into the ceramic layer mold, placing the ceramic particle preform into the cavity of the ceramic layer mold, and then injecting 1600-1650°C alloy iron liquid into the cavity of the ceramic layer mold, and pressurizing it, maintaining the pressure for 4-6 minutes, and when the temperature in the casting mold drops to 500-600°C, opening the mold, and quickly placing the formed grinding roller sleeve into a heat treatment furnace, the furnace temperature of the heat treatment furnace is set to 1000°C, and after keeping warm for 12 hours, the semi-finished product is allowed to drop to 200°C along with the furnace temperature, and then taken out of the furnace and naturally cooled to room temperature to form the ceramic grinding layer; S8: Processing the length of the exposed ends of the first grinding part and the second grinding part so that the exposed ends are 4 to 6 mm higher than the ceramic grinding layer. 9. The method for preparing wear-resistant parts according to claim 8 is characterized in that the metal element content of the alloy iron liquid is 22% to 35%, and the metal elements include copper, nickel, molybdenum, chromium, and iron, and the alloy iron liquid also contains 2% to 4% carbon. 10. The method for preparing a wear-resistant part according to claim 8, characterized in that the ceramic particles are composed of TiO2, Fe2O3, SiO2 and Al2O3.