CN114669361B - Bimetal wear-resistant roller sleeve with ultrahigh imbedding post nail surface density and manufacturing method thereof - Google Patents
Bimetal wear-resistant roller sleeve with ultrahigh imbedding post nail surface density and manufacturing method thereof Download PDFInfo
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- CN114669361B CN114669361B CN202210330565.0A CN202210330565A CN114669361B CN 114669361 B CN114669361 B CN 114669361B CN 202210330565 A CN202210330565 A CN 202210330565A CN 114669361 B CN114669361 B CN 114669361B
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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
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Abstract
The invention relates to a bimetal wear-resistant roller sleeve with ultra-high insert casting post nail surface density and a manufacturing method thereof, wherein the ultra-Gao Xiangzhu post nail surface density refers to: the sum of the sectional areas of the posts accounts for more than 50% of the wear-resistant area of the roller sleeve, namely the surface density, the posts are closely arranged in a one-dimensional direction such as the bus direction or the circumferential direction of the roller sleeve, no gaps are formed among the posts to form post rows, the posts are connected through brazing, the distance among the post rows is smaller than the width of the post rows, namely the surface density of the roller sleeve embedded casting post is larger than 50%; the bimetal wear-resistant roller sleeve with the super Gao Xiangzhu post nail surface density consists of three parts: the double-metal is that the abrasion-resistant alloy body between the column nail rows and the roller sleeve base body are two metals with different components and performances; the connection among the stud, the wear-resistant alloy body and the matrix of the bimetal wear-resistant roller sleeve with the stud surface density exceeding Gao Xiangzhu is realized by utilizing the overheat heat capacity and the solidification heat capacity of molten steel to heat and melt the brazing alloy.
Description
Technical Field
The invention discloses a bimetal wear-resistant roller sleeve with ultrahigh imbedded stud surface density and a manufacturing method thereof, relates to wear-resistant performance design of a roller sleeve working surface for crushing of a roller press and a casting method thereof, and belongs to the technical field of metal material forming and control.
Background
The method for improving the wear-resistant life of the roller sleeve by embedding hard alloy column nails on the surface layer of the roller sleeve of the roller press by utilizing the high wear-resistant performance of the hard alloy is a general method, and the surface density of the hard alloy column nails determines the wear-resistant performance of the roller sleeve, wherein the column nail surface density refers to the proportion of the sum of the sectional areas of the column nails to the area of the wear surface 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 embedded hard alloy column nail has a certain critical value, namely: the surface density of the cast-in stud nails is critical surface density and is the maximum surface density when the heat capacity absorbed by the stud nails and the overheat heat capacity of the molten steel are balanced in the process that the molten steel flows into the gaps between the stud nails and fills the gaps, and the molten steel can keep liquid fluidity to enter the gaps between the stud nails and completely fill the gaps under the critical surface density condition; when the surface density of the column nails is larger than the critical surface density, the gaps among the column nails cannot be fully filled with molten steel, namely, the matrix after solidification of the molten steel cannot realize complete fixing of the column nails, early-stage fragmentation and fracture of the column nails are easy to occur in the use process, and the service life of the roller sleeve is greatly reduced.
The distribution structure of the column nails cast in the surface layer of the roller sleeve of the existing roller press is independently distributed, namely, certain intervals are reserved among all the column nails, so that the specific surface area of the column nails, which is contacted with molten steel and absorbs heat, is increased, the cooling speed of the column nails to the molten steel is increased, and the critical surface density of the column nails cast in the roller sleeve is reduced.
Based on the restriction of critical surface density, the surface density of post nails cast in the surface layer of the existing roller sleeve of the roller press is smaller than the critical surface density, and the service life of the roller sleeve cannot be prolonged in a mode of improving the surface density of hard alloy post nails, so that a method of casting post nails in an inlaid manner and overlaying a layer of wear-resistant alloy between the post nails is adopted to prolong the service life of a 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 post nails and low wear resistance of an overlaying alloy layer, and overlaying maintenance is still needed to be carried out on the roller surface in the use process.
The invention relates to a bimetal wear-resistant roller sleeve with ultra-high insert casting column nail surface density, which is as follows: the sum of the sectional areas of the posts accounts for more than 50% of the wear-resistant area of the roller sleeve, namely the surface density, the posts are closely arranged in a one-dimensional direction such as the bus direction or the circumferential direction of the roller sleeve, no gaps are formed among the posts to form post rows, the posts are connected through brazing, the distance among the post rows is smaller than the width of the post rows, namely the surface density of the roller sleeve embedded casting post is larger than 50%.
The bimetal wear-resistant roller sleeve with the super Gao Xiangzhu post nail surface density consists of three parts: the double-metal is that the abrasion-resistant alloy body between the column nail rows and the roller sleeve base body are two metals with different components and performances;
the column nails are arranged in a certain number in a one-dimensional direction, such as the bus direction or the circumferential direction of the roller sleeve, and the column nails are closely arranged without gaps, and each column nail circumferential surface is coated or coated with a brazing alloy plate or brazing alloy powder coating or a hot dip brazing alloy precoat for brazing connection among the column nails, between the column nails and the wear-resistant alloy body and between the column nails and the roller sleeve matrix, and brazing connection is realized by utilizing the overheat heat capacity and the solidification heat capacity of molten steel to heat and melt brazing alloy;
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, and 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 overheat heat capacity and the solidification heat capacity of molten steel;
the cross section of the wear-resistant alloy powder core tube is trapezoid which can form a roller sleeve annular wear-resistant layer cylinder with the column nail row alternately, and the length of the bottom edge of the trapezoid is smaller than the width of the column nail row, so that the surface density of the cast-in column nail is greater than 50%.
The trapezoid wear-resistant alloy powder core tube and the column nail rows alternately form a roll sleeve circumference ring shape to be fixed in a roll sleeve casting cavity, and the brazing alloy and the wear-resistant alloy powder are heated and melted by utilizing the overheat heat capacity and the solidification heat capacity of molten steel after molten steel is poured to obtain the bimetal wear-resistant roll sleeve with ultra-high insert casting column nail surface density.
Disclosure of Invention
The invention relates to a bimetal wear-resistant roller sleeve with ultra-high insert casting post nail surface density and a manufacturing method thereof, wherein the ultra-Gao Xiangzhu post nail surface density refers to: the sum of the sectional areas of the posts accounts for more than 50% of the wear-resistant area of the roller sleeve, namely the surface density, the posts are closely arranged in a one-dimensional direction such as the bus direction or the circumferential direction of the roller sleeve, no gaps are formed among the posts to form post rows, the posts are connected through brazing, the distance among the post rows is smaller than the width of the post rows, namely the surface density of the roller sleeve embedded casting post is larger than 50%.
The bimetal wear-resistant roller sleeve capable of exceeding the surface density of Gao Xiangzhu posts consists of three parts: the double-metal is that the abrasion-resistant alloy body between the column nail rows and the roller sleeve base body are two metals with different components and performances;
the column nails are arranged in a certain number in a one-dimensional direction, such as the bus direction or the circumferential direction of the roller sleeve, and the column nails are closely arranged without gaps, and each column nail circumferential surface is coated or coated with a brazing alloy plate or brazing alloy powder coating or a hot dip brazing alloy precoat for brazing connection among the column nails, between the column nails and the wear-resistant alloy body and between the column nails and the roller sleeve matrix, and brazing connection is realized by utilizing the overheat heat capacity and the solidification heat capacity of molten steel to heat and melt brazing alloy;
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, and 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 overheat heat capacity and the solidification heat capacity of molten steel;
the cross section of the wear-resistant alloy powder core tube is trapezoid which can form a roller sleeve annular wear-resistant layer cylinder with the rows of the posts alternately, and the length of the bottom edge of the trapezoid is smaller than the width of the rows of the posts.
A bimetal wear-resistant roller sleeve with ultra-high insert casting post nail surface density and a manufacturing method thereof are implemented by the following steps: the trapezoidal wear-resistant alloy powder core pipe and the column pin rows are alternately fixed in a roll sleeve casting cavity to form a roll sleeve wear-resistant layer annular cylinder, and the brazing alloy and the wear-resistant alloy powder are heated and melted by utilizing the overheat heat capacity and the solidification heat capacity of molten steel after molten steel is poured to obtain the bimetal wear-resistant roll sleeve with ultrahigh embedded casting column pin surface density.
Claims (2)
1. The bimetal wear-resistant roller sleeve with the ultra-high insert casting post nail surface density is characterized in that the ultra-Gao Xiangzhu post nail surface density is as follows: the sum of the sectional areas of the posts accounts for more than 50% of the wear-resistant area of the roller sleeve, namely the surface density of the posts is higher than 50%, the posts are closely arranged in a one-dimensional direction without gaps to form post rows, the posts are connected through brazing, the distance between the post rows is smaller than the width of the post rows, namely the surface density of the roller sleeve embedded casting posts is higher than 50%;
the bimetal wear-resistant roller sleeve with the super Gao Xiangzhu post nail surface density consists of three parts:
the double-metal is that the abrasion-resistant alloy body between the column nail rows and the roller sleeve base body are two metals with different components and performances;
the column nails are arranged in a one-dimensional direction, the column nails are closely arranged in a gapless manner to form column nails, the peripheral surface of each column nail is coated or coated with a brazing alloy plate or a brazing alloy powder coating or a hot dip brazing alloy precoating layer for brazing connection among the column nails, between the column nails and the wear-resistant alloy body and between the column nails and the roller sleeve matrix, and the brazing connection is realized by heating and melting the brazing alloy through the overheat 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, and 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 overheat heat capacity and the solidification heat capacity of molten steel;
the cross section of the wear-resistant alloy powder core tube is trapezoid capable of forming a roller sleeve annular wear-resistant layer cylinder with the column pin rows alternately, and the length of the bottom edge of the trapezoid is smaller than the width of the column pin rows;
alternately fixing the trapezoid wear-resistant alloy powder core tube and the column pin rows in a roll sleeve casting cavity to form a roll sleeve wear-resistant layer annular cylinder, and heating and melting brazing alloy and wear-resistant alloy powder by utilizing overheat heat capacity and solidification heat capacity of molten steel after casting the molten steel to obtain the bimetal wear-resistant roll sleeve with ultrahigh imbedded column pin surface density;
the stud shape structure of the bimetal wear-resistant roller sleeve with the stud surface density exceeding Gao Xiangzhu comprises two parts:
the length of the wear-resistant alloy body of the bimetal wear-resistant roller sleeve with the super Gao Xiangzhu post surface density in the radial direction of the roller sleeve is smaller than the length of the rectangular cylindrical body part of the post pin in the radial direction of the roller sleeve.
2. The bi-metallic wear roller sleeve of super Gao Xiangzhu post areal density of claim 1, wherein said one-dimensional direction comprises a roller sleeve generatrix direction or a roller sleeve circumferential direction.
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| 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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| 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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| CN114669361A CN114669361A (en) | 2022-06-28 |
| CN114669361B true CN114669361B (en) | 2023-09-26 |
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