CN114669361A - Bimetal wear-resistant roller sleeve with ultrahigh embedded stud surface density and manufacturing method thereof - Google Patents
Bimetal wear-resistant roller sleeve with ultrahigh embedded stud surface density and manufacturing method thereof Download PDFInfo
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- CN114669361A CN114669361A CN202210330565.0A CN202210330565A CN114669361A CN 114669361 A CN114669361 A CN 114669361A CN 202210330565 A CN202210330565 A CN 202210330565A CN 114669361 A CN114669361 A CN 114669361A
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- stud
- wear
- roller sleeve
- resistant
- rows
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C4/00—Crushing or disintegrating by roller mills
- B02C4/28—Details
- B02C4/30—Shape or construction of rollers
- B02C4/305—Wear resistant rollers
Abstract
The invention relates to a bimetal wear-resistant roller sleeve with ultrahigh cast-in stud surface density and a manufacturing method thereof, wherein the ultrahigh cast-in stud surface density is as follows: the sum of the sectional areas of the studs accounts for the proportion of the wear-resistant area of the roller sleeve, namely, the surface density exceeds 50 percent, the studs are closely arranged without gaps in one-dimensional direction such as the bus direction or the contour direction of the roller sleeve to form stud rows, the studs are connected by brazing, the space between the stud rows is smaller than the width of the stud rows, namely, the surface density of the stud inlaid in the roller sleeve is larger than 50 percent; the bimetal wear-resistant roller sleeve with ultrahigh surface density of the cast-in stud consists of three parts: the double metals are metals with two different components and different performances, namely the wear-resistant alloy body and the matrix between the stud rows; the connection among the stud, the wear-resistant alloy body and the base body of the bimetal wear-resistant roller sleeve with ultrahigh embedded stud surface density is realized by heating and melting the brazing alloy by utilizing the overheating heat capacity and the solidification heat capacity of molten steel.
Description
Technical Field
The invention discloses a bimetal wear-resistant roller sleeve with ultrahigh embedded stud surface density and a manufacturing method thereof, relates to wear-resistant performance design of a roller sleeve working surface for crushing powder of a roller press and a casting method thereof, and belongs to the technical field of metal material forming and controlling.
Background
The method for improving the wear-resisting service life of the roller sleeve by utilizing the high wear-resisting property of the hard alloy to cast the hard alloy stud in the surface layer of the roller sleeve of the roller press is a universal method, the surface density of the hard alloy stud determines the wear-resisting property of the roller sleeve, and the surface density of the stud refers to the proportion of the sum of the sectional areas of the studs to the wear surface area of the roller sleeve; under the condition of no external field such as heating, centrifugal force, vibration and electromagnetic field, the surface density of the cast-in cemented carbide stud has a certain critical value, namely: when the heat capacity absorbed by the studs and the overheat heat capacity of the molten steel are balanced in the process that the molten steel flows into gaps among the studs and fills the gaps, the surface density of the cast-in studs is critical surface density and also maximum surface density, and the molten steel can keep liquid fluidity to enter the gaps among the studs and completely fill the gaps under the critical surface density condition; when the surface density of the stud is greater than the critical surface density, the molten steel cannot completely fill the gap between the studs, namely, the solidified base body of the molten steel cannot completely fix the stud, the stud is easy to crack and break in the early stage in the using process, and the service life of the roller sleeve is greatly shortened.
The distribution structure of studs cast-in on the surface layer of the roller sleeve of the existing roller press is independently distributed, namely, a certain distance is reserved among all studs, so that the specific surface area of the studs contacting with molten steel for absorbing heat is increased, the cooling speed of the studs on the molten steel is increased, and the critical surface density of the studs cast-in on the roller sleeve is reduced.
Based on the restriction of critical surface density, the surface density of studs cast in the surface layer of the roller sleeve of the existing roller press is smaller than the critical surface density, and the service life of the roller sleeve cannot be prolonged in a mode of increasing the surface density of hard alloy studs, so that the method of casting studs in and surfacing a layer of wear-resistant alloy between studs is adopted to prolong the service life of the wear-resistant layer of the roller sleeve, but the wear-resistant performance of the roller sleeve is insufficient due to low surface density of the studs and low wear resistance of a surfacing alloy layer, and the surfacing maintenance of the roller surface is still required in the using process.
The invention relates to a bimetal wear-resistant roller sleeve with ultrahigh cast-in stud surface density, which is characterized in that: the sum of the sectional areas of the studs accounts for the proportion of the wear-resistant area of the roller sleeve, namely, the surface density exceeds 50%, the studs are closely arranged in a gapless way in one-dimensional direction such as the bus direction or the contour direction of the roller sleeve to form stud rows, the studs are connected by brazing, the space between the stud rows is smaller than the width of the stud rows, namely, the surface density of the stud cast in the roller sleeve is larger than 50%.
The bimetal wear-resistant roller sleeve with ultrahigh cast-in stud surface density consists of three parts: the double metals refer to the wear-resistant alloy body and the base body between the stud rows which are two metals with different components and different performances;
the stud rows are formed by closely arranging a certain number of studs in a one-dimensional direction, such as the bus direction or the peripheral direction of the roller sleeve and the gaps among the studs, the peripheral surface of each stud is coated or coated with a brazing alloy plate or a brazing alloy powder coating or a hot-dip brazing alloy precoat for brazing connection among the studs, between the stud and a wear-resistant alloy body and between the stud and a roller sleeve substrate, and the brazing connection is realized by heating and melting the brazing alloy by utilizing the overheating heat capacity and the solidification heat capacity of molten steel;
the wear-resistant alloy body is formed by filling wear-resistant alloy powder with the melting point lower than that of a matrix or wear-resistant alloy powder generated by exothermic reaction into a thin-wall steel pipe, wherein the wear-resistant alloy powder core pipe which is always kept sealed and has the vacuum degree of less than 1 Pa in the pipe is heated and melted by utilizing the overheating heat capacity and the solidification heat capacity of molten steel;
the cross section of the wear-resistant alloy powder core pipe is in a trapezoid shape capable of forming a cylinder with a roller sleeve circular wear-resistant layer at intervals with the stud row, and the length of the bottom edge of the trapezoid is smaller than the width of the stud row, so that the surface density of the cast-in stud is larger than 50%.
The trapezoidal wear-resistant alloy powder core tubes and the stud rows are alternately formed into a roller sleeve, the roller sleeve is circumferentially and annularly fixed in a roller sleeve casting cavity, and the brazing alloy and the wear-resistant alloy powder are heated and melted by using the overheating heat capacity and the solidification heat capacity of the molten steel after the molten steel is poured to obtain the bimetal wear-resistant roller sleeve with ultrahigh embedded stud surface density.
Disclosure of Invention
The invention relates to a bimetal wear-resistant roller sleeve with ultrahigh cast-in stud surface density and a manufacturing method thereof, wherein the ultrahigh cast-in stud surface density is as follows: the sum of the cross sections of the studs accounts for the proportion of the wear-resistant area of the roller sleeve, namely, the surface density exceeds 50%, the studs are closely arranged without gaps in one-dimensional directions such as the bus direction or the contour direction of the roller sleeve to form stud rows, the studs are connected by brazing, the space between the stud rows is smaller than the width of the stud rows, namely, the surface density of the stud inlaid in the roller sleeve is larger than 50%.
The bimetal wear-resistant roller sleeve capable of ultrahigh cast-in stud surface density consists of three parts: the double metals refer to the wear-resistant alloy body and the base body between the stud rows which are two metals with different components and different performances;
the stud rows are formed by closely arranging a certain number of studs in a one-dimensional direction, such as the bus direction or the peripheral direction of the roller sleeve and the gaps among the studs, the peripheral surface of each stud is coated or coated with a brazing alloy plate or a brazing alloy powder coating or a hot-dip brazing alloy precoat for brazing connection among the studs, between the stud and a wear-resistant alloy body and between the stud and a roller sleeve substrate, and the brazing connection is realized by heating and melting the brazing alloy by utilizing the overheating heat capacity and the solidification heat capacity of molten steel;
the wear-resistant alloy body is formed by filling wear-resistant alloy powder with the melting point lower than that of a matrix or wear-resistant alloy powder generated by exothermic reaction into a thin-wall steel pipe, wherein the wear-resistant alloy powder core pipe which is always kept sealed and has the vacuum degree of less than 1 Pa in the pipe is heated and melted by utilizing the overheating heat capacity and the solidification heat capacity of molten steel;
the cross-sectional shape of wear-resisting alloy powder core pipe is for can form the trapezoidal of roller cover ring shape wearing layer cylinder with the stud row is alternate, and its trapezoidal base length is less than the width of stud row.
A bimetal wear-resistant roller sleeve with ultrahigh cast-in stud surface density and a manufacturing method thereof are disclosed, wherein the implementation method comprises the following steps: and fixing the trapezoidal wear-resistant alloy powder core tubes and the stud rows in the casting cavity of the roller sleeve alternately to form a circular cylinder of the wear-resistant layer of the roller sleeve, and heating and melting the brazing alloy and the wear-resistant alloy powder by using the overheating heat capacity and the solidification heat capacity of the molten steel after the molten steel is poured to obtain the bimetal wear-resistant roller sleeve with ultrahigh embedded stud surface density.
Claims (7)
1. The invention relates to a bimetal wear-resistant roller sleeve with ultrahigh cast-in stud surface density and a manufacturing method thereof, which are remarkably characterized in that: the ultrahigh cast-in stud areal density means that: the sum of the sectional areas of the studs accounts for the proportion of the wear-resistant area of the roller sleeve, namely, the surface density exceeds 50 percent, the studs are closely arranged without gaps in one-dimensional direction such as the bus direction or the circumferential line direction of the roller sleeve to form stud rows, the studs are connected by brazing, the space between the stud rows is smaller than the width of the stud rows, namely, the surface density of the stud inlaid in the roller sleeve is larger than 50 percent;
the bimetal wear-resistant roller sleeve with ultrahigh cast-in stud surface density consists of three parts: the double metals refer to the wear-resistant alloy body and the base body between the stud rows which are two metals with different components and different performances;
the stud rows are formed by closely arranging a certain number of studs in a one-dimensional direction, such as the bus direction or the peripheral direction of the roller sleeve and the gaps among the studs, the peripheral surface of each stud is coated or coated with a brazing alloy plate or a brazing alloy powder coating or a hot-dip brazing alloy precoat for brazing connection among the studs, between the stud and a wear-resistant alloy body and between the stud and a roller sleeve substrate, and the brazing connection is realized by heating and melting the brazing alloy by utilizing the overheating heat capacity and the solidification heat capacity of molten steel;
the wear-resistant alloy body is formed by filling wear-resistant alloy powder with the melting point lower than that of a matrix or wear-resistant alloy powder generated by exothermic reaction into a thin-wall steel pipe, wherein the wear-resistant alloy powder core pipe which is always kept sealed and has the vacuum degree of less than 1 Pa in the pipe is heated and melted by utilizing the overheating heat capacity and the solidification heat capacity of molten steel;
the cross section of the wear-resistant alloy powder core pipe is in a trapezoid shape capable of forming a cylinder of the roller sleeve circular wear-resistant layer with the stud rows at intervals, and the length of the bottom edge of the trapezoid is smaller than the width of the stud rows;
and fixing the trapezoidal wear-resistant alloy powder core tubes and the stud rows in the casting cavity of the roller sleeve alternately to form a circular cylinder of the wear-resistant layer of the roller sleeve, and heating and melting the brazing alloy and the wear-resistant alloy powder by using the overheating heat capacity and the solidification heat capacity of the molten steel after pouring the molten steel to obtain the bimetal wear-resistant roller sleeve with ultrahigh embedded stud surface density.
2. The stud of the bimetal wear-resistant roller sleeve with ultrahigh stud areal density according to claim 1 is closely arranged in the roller sleeve generatrix direction without gaps between studs to form stud rows, the connections between studs are braze connections, and the spacing between stud rows is smaller than the width of the stud rows, namely the stud areal density of the roller sleeve insert stud is larger than 50%.
3. The stud of the bimetal wear-resistant roller sleeve with ultrahigh stud areal density according to claim 1 is closely arranged in the circumferential line direction of the roller sleeve without gaps between studs to form stud rows, the connection between studs is a braze connection, and the spacing between stud rows is smaller than the width of the stud rows, namely the stud areal density of the roller sleeve insert stud is more than 50%.
4. The wear-resistant alloy body between the bimetal wear-resistant roller sleeve stud rows with ultrahigh stud surface density according to claim 1 is formed by filling wear-resistant alloy powder with a melting point lower than that of a matrix or wear-resistant alloy powder generated by an exothermic reaction into a thin-walled steel pipe, and a wear-resistant alloy body is obtained by heating and melting a wear-resistant alloy powder core pipe which is always kept sealed and has a vacuum degree of less than 1 Pa in the pipe by using the overheating heat capacity and the solidification heat capacity of molten steel.
5. The connection between the stud, the wear-resistant alloy body and the base body of the bimetal wear-resistant roller sleeve with the ultrahigh insert casting stud surface density according to claim 1 is the brazing connection realized by heating and melting the brazing alloy by utilizing the overheating heat capacity and the solidification heat capacity of molten steel.
6. The stud-shaped structure of the bimetal wear-resistant roller sleeve with ultrahigh stud areal density according to claim 1 is composed of two parts: the working wear-resistant cylinder comprises a rectangular cylinder part with a fillet transition and a conical body part which is cast in a base body, has a crown head and is internally concave and curved, and has a fillet transition to the rectangular cylinder.
7. The wear-resistant alloy body of the bimetal wear-resistant roller sleeve with the ultrahigh stud areal density according to claim 1 has a length in the radial direction of the roller sleeve which is less than or equal to the length of the rectangular cylindrical body part of the stud in the radial direction of the roller sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210330565.0A CN114669361B (en) | 2022-03-31 | 2022-03-31 | Bimetal wear-resistant roller sleeve with ultrahigh imbedding post nail surface density and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210330565.0A CN114669361B (en) | 2022-03-31 | 2022-03-31 | Bimetal wear-resistant roller sleeve with ultrahigh imbedding post nail surface density and manufacturing method thereof |
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| Publication Number | Publication Date |
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| CN114669361A true CN114669361A (en) | 2022-06-28 |
| CN114669361B CN114669361B (en) | 2023-09-26 |
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| CN202210330565.0A Active CN114669361B (en) | 2022-03-31 | 2022-03-31 | Bimetal wear-resistant roller sleeve with ultrahigh imbedding post nail surface density and manufacturing method thereof |
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| CN114669361B (en) | 2023-09-26 |
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