CN113020524A - Forging seat for forming high-L-shaped wear-resistant lining plate and lining plate forming method - Google Patents
Forging seat for forming high-L-shaped wear-resistant lining plate and lining plate forming method Download PDFInfo
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- CN113020524A CN113020524A CN202110226389.1A CN202110226389A CN113020524A CN 113020524 A CN113020524 A CN 113020524A CN 202110226389 A CN202110226389 A CN 202110226389A CN 113020524 A CN113020524 A CN 113020524A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J13/00—Details of machines for forging, pressing, or hammering
- B21J13/02—Dies or mountings therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
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Abstract
The invention discloses a forging seat for forming a high-L-shaped wear-resistant lining plate and a lining plate forming method, wherein the forging seat comprises an upper seat and a lower seat, the upper seat and the lower seat are matched for use, the upper surface of the lower seat is provided with a first groove, and the lower surface of the upper seat is provided with a second groove; the first groove and the second groove enclose to form a high-L-shaped wear-resistant lining plate forming space, and the lining plate forming method utilizes the high-L-shaped wear-resistant lining plate forming forging seat to forge and press the high-L-shaped wear-resistant lining plate into the high-L-shaped wear-resistant lining plate. The forging seat for forming the high-L-shaped wear-resistant lining plate solves the problems that a larger press is required, the variety of die forging dies is large, and the price investment is high in the prior art, and the forging seat for forming the lining plate has the advantages that the yield is more than 70%, the rough material processing is less, and the production cost is low. The lining plate obtained by the method has high mechanical property, good wear resistance and reduced breakage rate.
Description
Technical Field
The invention belongs to the technical field of wear-resistant lining plate processing, relates to wear-resistant lining plate processing equipment and a method, and particularly relates to a forging seat for forming an L-shaped wear-resistant lining plate and a forming method of the L-shaped wear-resistant lining plate.
Background
The common semi-autogenous mill and autogenous mill have dozens of models, the diameter is 3-15 meters, the length is 2-10 meters, and the cylinder body of each diameter comprises an annular mill cylinder body consisting of 20-70 lining plates. The diameter and length of each semi-autogenous mill cylinder are different, and each semi-autogenous mill has dozens of liner plates with different sizes and shapes. According to the functional division, the lining plates are divided into a cylinder lining plate, an angle lining plate, a feeding end lining plate, an ore pulp lifter, an intermediate discharging plate, a discharging grid plate and the like.
The inventor finds that the technology has at least the following technical problems in the long-term use process:
(1) the thickness of the lining plate of the semi-autogenous mill is 30-400 mm, the length is about 2m, the section is large, the structural shape is complex, the existing wear-resistant lining plate is cast and formed and is easy to break and lose efficacy, and therefore the service life is about 4 months.
(2) The steel forging and forming includes free forging and die forging.
The basic processes of free forging include upsetting, drawing, punching, cutting, bending, twisting, misalignment, and the like. The working surface of the free forging machine comprises an upper seat and a lower seat. The upper seat and the lower seat have the same length, and the working surfaces are both planes. In the conventional technology, if the upper seat and the lower seat are set to be non-planar, the forging is lengthened but not concentric in the production process, the machining allowance of the non-concentric forging must be increased, the later machining allowance is increased, and the cost is increased.
The die forging is open die forging and closed die forging, and a metal blank is pressed and deformed in a die cavity with a certain shape to obtain a forge piece, so that a die is required for each model of die forging. However, the semi-autogenous mill wear-resistant lining plate has the defects of multiple models, complex configuration, large die forging pressure, transition angle and the like, so that a large amount of finish machining is needed after free forging, and a large amount of dies are needed for die forging.
Fig. 2 is a schematic end profile view of a high L wear liner of the present invention. The left side low part is the crushing part, the right side bulge part is the lifting part, the height of the lifting part is more than 2 times of the height of the crushing part, and the bottom surface is the mounting surface. According to fig. 2, when viewed from the mounting surface counterclockwise, the surfaces of the high L-shaped wear-resistant lining plate are respectively a mounting surface, a first splicing surface, a first lifting surface, a lifting top surface, a second lifting surface, a transition surface, a crushing surface and a second splicing surface. The mounting surface is the surface of connecting the wear-resistant lining plate and the mill outer cylinder body. In the mill inner cylinder body, an annular mill cylinder body is formed by 20-70 lining plates, namely, a first splicing surface of one wear-resistant lining plate is attached to a second splicing surface of an adjacent wear-resistant lining plate. The second lifting surface makes a linear transition to the crushing surface, the transition part being a transition surface. In the prior art, a forging seat for forming a high-L-shaped wear-resistant lining plate does not exist.
Disclosure of Invention
In view of the above, the present invention aims to provide a forging seat for forming a high L-shaped wear-resistant lining plate.
The invention also aims to provide a forming method for forging the high-L-shaped wear-resistant lining plate by using the forging seat.
The invention provides a forging seat for forming a high L-shaped wear-resistant lining plate, which comprises an upper seat and a lower seat, wherein the upper seat and the lower seat are matched for use, a first groove is formed in the upper surface of the lower seat, and a second groove is formed in the lower surface of the upper seat; the first groove and the second groove enclose to form a high L-shaped wear-resistant lining plate forming space.
According to one embodiment of the forging seat for forming the high-L-shaped wear-resistant lining plate, the first groove is formed by sequentially connecting a mounting surface forming surface, a first splicing surface forming surface and a first lifting surface forming surface.
According to an embodiment of the forging seat for forming the high-L-shaped wear-resistant lining plate, the second groove is formed by sequentially connecting a second splicing surface forming surface, a crushing surface forming surface, a transition surface forming surface, a second lifting surface forming surface and a lifting top surface forming surface.
According to one embodiment of the forging press seat for forming the high-L-shaped wear-resistant lining plate, the lifting angle of the first lifting surface formed by the first lifting surface forming surface is 10-50 degrees, the lifting angle of the second lifting surface formed by the second lifting surface forming surface is 10-50 degrees, and the width of the mounting surface forming surface is 100-800 mm.
According to one embodiment of the forging seat for forming the high-L-shaped wear-resistant lining plate, the forming surface of the lifting top surface is a curved surface, a plane or a surface formed by two planes with an acute included angle or an obtuse included angle; the lead of the curved surface is a line segment obtained from a circle, an ellipse, a parabola or a wavy line; the width of the lifting top surface forming surface is 1-200 mm.
According to one embodiment of the forging seat for forming the high-L-shaped wear-resistant lining plate, the forming surface of the crushing surface is a plane, a curved surface or a concave-convex surface; the generating line of the curved surface is a straight line or an arc line, and the conducting wire of the curved surface is a sawtooth line, a wavy line or an arc line.
According to one embodiment of the forging seat for forming the high-L-shaped wear-resistant lining plate, the first lifting surface forming surface, the lifting top surface forming surface and the second lifting surface forming surface form one or a combination of two of a trapezoid, a triangle, a rectangle, a herringbone and a semicircle with the height of 100-500 mm in an enclosing mode.
According to one embodiment of the forging seat for forming the high-L-shaped wear-resistant lining plate, the forming surface of the transition surface is an arc surface or a plane.
According to an embodiment of the forging seat for forming the high-L-shaped wear-resistant lining plate, the second lifting surface forming surface and the crushing surface forming surface are in linear transition forming through the transition surface forming surface.
The invention also provides a liner plate forming method based on the forging seat for forming the high-L-shaped wear-resistant liner plate, which comprises the following steps:
A. forging and pressing the steel billet into a square billet by using a forging press;
B. replacing and installing the lower seat with the first groove, forging and pressing the lower seat into a primary blank, and finishing the molding of the installation surface, the first splicing surface and the first lifting surface;
C. and replacing and installing the upper seat with the second groove, and mutually matching the upper seat and the lower seat to continue extending and precisely forming the primary blank until the second splicing surface, the crushing surface, the transition surface, the second lifting surface and the lifting top surface are formed, so that the forming of the high-L-shaped wear-resistant lining plate is completed.
Compared with the prior art, one of the technical solutions has the following advantages:
the forging seat for forming the high-L-shaped wear-resistant lining plate solves the problems that a larger press is required, the variety of die forging dies is large, and the price investment is high in the prior art, and the forging seat for forming the lining plate has the advantages that the yield is more than 70%, the rough material processing is less, and the production cost is low. The lining plate obtained by the method has high mechanical property, good wear resistance and reduced breakage rate.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic structural view of a preferred embodiment of a forging seat for forming a high-L-shaped wear-resistant lining plate according to the present invention.
FIG. 2 is a schematic view of the profile of the end face of the high L-shaped wear-resistant lining plate formed by forging and pressing the forging seat for forming the high L-shaped wear-resistant lining plate according to the invention.
The labels in the figure are respectively: 1 a lining board is arranged on the base plate,
100 of the lower seat is arranged on the lower seat,
101 a mounting surface forming surface and a mounting surface forming surface,
102 a first splicing surface forming surface of the first material,
103 a first lifting surface forming surface,
200 of the upper seat of the water tank,
201 raising the top-surface forming surface,
202 a second splicing surface-forming surface,
203 a second lifting surface forming surface,
204 of the crushing surface are formed into a surface,
205 transition surface forming surfaces.
Detailed Description
The following description is made with reference to the accompanying drawings and a specific embodiment.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it may not be further defined and explained in subsequent figures.
Example 1
Referring to fig. 1, the forging seat for forming the high-L wear-resistant lining plate described in this embodiment includes an upper seat 200 and a lower seat 100, the upper seat and the lower seat are used in cooperation, the upper surface of the lower seat is provided with a first groove, and the lower surface of the upper seat is provided with a second groove; the first groove and the second groove enclose a high L-shaped wear-resistant lining plate forming space, and the L-shaped wear-resistant lining plate is finally formed in the forming space. The forging seat for forming the high-L-shaped wear-resistant lining plate divides each surface of the high-L-shaped wear-resistant lining plate into two stages for forming by taking the longest diagonal line as a dividing line according to the shape characteristics of the wear-resistant lining plate and forging and demoulding requirements.
The first molding stage is the molding of the lining plate mounting surface, the first splicing surface and the first lifting surface. Specifically, a first groove is formed in the lower base 100, the first groove is an upward-opening groove formed by sequentially connecting the mounting surface forming surface 101, the first splicing surface forming surface 102, and the first lifting surface forming surface 103, and the first groove is an asymmetric V-shaped groove. The mounting surface molding surface 101 is an arc surface or a plane, preferably an arc surface, and may be provided with a concave-convex shape or a corrugated pattern, or may be provided with a convex strip. The specification and the size of the first groove are specifically set according to the specification requirement of the lining plate on the cylinder body of the mill, and generally, the width of the mounting surface forming surface is within the range of 100-800 mm. The mill cylinder is assembled by 44 wear-resistant lining plates, the circular angle of the arc corresponding to the mounting surface of each lining plate is 8.18 degrees, namely the included angle between the first splicing surface and the second splicing surface is 8.18 degrees, or the included angle between the first splicing surface molding surface 102 and the second splicing surface molding surface 202 is 8.18 degrees. For the convenience of forging and pressing, the corner between the mounting surface forming surface 101 and the first splicing surface forming surface 102 is set to be a round corner, and the corner between the mounting surface forming surface 101 and the first splicing surface forming surface 102 is the lowest point of the first groove.
The second molding stage is molding of a second splicing surface, a crushing surface, a transition surface, a second lifting surface and a lifting top surface. Specifically, a second groove is formed in the lower surface of the upper seat 200, and the groove is a downward-opening groove formed by sequentially connecting a second splicing surface forming surface 202, a crushing surface forming surface 204, a transition surface forming surface 205, a second lifting surface forming surface 203 and a lifting top surface forming surface 201.
In a further embodiment, the first lifting surface forming surface forms a lifting angle of the first lifting surface of 10 ° to 50 °, and the second lifting surface forming surface forms a lifting angle of the second lifting surface of 10 ° to 50 °. The lifting angle of the first lifting surface and the lifting angle of the second lifting surface may be equal or unequal. The angle between the first lifting surface forming surface and the second lifting surface forming surface is mainly determined by the requirements of the lifting angle of the first lifting surface and the lifting angle of the second lifting surface.
In a further embodiment, the raised top molding surface 201 is a curved surface, a plane, or a surface formed by two planes having an acute angle or an obtuse angle; the lead of the curved surface is a line segment obtained from a circle, an ellipse, a parabola or a wavy line; the width of the lifting top surface forming surface is 1-200 mm. In this embodiment, the lifting top surface molding surface 201 is a curved surface, and the conducting wire of the curved surface is a line segment obtained from a circle.
In further embodiments, all or a portion of the crushing surface shaping surface 204 is a flat surface or a curved surface or a concave-convex surface; the generatrix of the curved surface is a straight line or an arc line, or the lead of the curved surface is a sawtooth line, a wavy line or an arc line.
In a further embodiment, the first lifting surface forming surface 103, the lifting top surface forming surface 201 and the second lifting surface forming surface 203 enclose one or a combination of two of a trapezoid, a triangle, a rectangle, a herringbone and a semicircle with a height of 100-500 mm. That is, the lifting portion of the wear liner is one or a combination of two of trapezoidal, triangular, rectangular, herringbone, and semi-circular. In this embodiment, the lifting top molding surface 201 is semicircular.
The transition surface forming surface 205 is an arc surface or a plane surface. In this embodiment, the transition surface forming surface 205 is an arc surface. The second lifting surface forming surface 203 to the crushing surface forming surface 204 are linearly shaped over-formed by a transition surface forming surface 205. Through setting up the transition face, the forging and pressing of being convenient for on the one hand, on the other hand can improve the wearability of wear-resisting welt.
Example 2
In this embodiment, the forging seat for forming the high-L wear-resistant lining plate described in embodiment 1 is used to prepare the high-L wear-resistant lining plate. The forming steps of the high L-shaped wear-resistant lining plate are as follows:
step A, casting the alloy into a steel ingot by adopting a smelting and refining process, carrying out hot delivery to a forging press, and forging and pressing the steel billet into a square billet by using a conventional forging press; specifically, the purposes of refining grains, changing the inclusion state, forging internal defects and eliminating segregation are achieved through at least two upsetting and drawing processes, and the initial section of a square billet is completed; after the rough forging is finished, the lower seat 100 with the first groove is directly replaced. The free forging base is adopted to forge, draw and form for multiple times in a horizontal mode step by step, the horizontal width of the upper base of the free forging machine is about 0.5m, the base is about 1m, the length of the lining plate is more than 1m, the forging piece is firstly drawn and formed for multiple times in a horizontal mode step by step through the stroke of the base.
And step B, replacing and installing the lower seat 100 with the first groove, obliquely placing the square blank manufactured in the step A into the first groove, forging and pressing the square blank into a primary blank with a cross section close to a triangle by using the flat upper seat, and finishing the molding of the installation surface, the first splicing surface and the first lifting surface of the wear-resistant lining plate.
And C, replacing and installing the upper seat 200 with the second groove, wherein the length of the lower seat 100 is not less than that of the upper seat 200, namely the length of the lower seat 100 is equal to that of the upper seat 200 or the length of the lower seat 100 is greater than that of the upper seat 200. The upper seat and the lower seat are matched with each other to enable the primary blank to continue to extend and be subjected to fine forming until the second splicing surface, the crushing surface, the transition surface, the second lifting surface and the lifting top surface are formed. After the pressure forming, promote seat of honour 200, lower 100 adopts the free stroke of machine itself and manipulator to mutually support progressively and move forward, perhaps adopts the manipulator to progressively remove the forging stock, and seat of honour 200 is the pressure forming again, guarantees that whole wear-resisting welt does not take place to deviate on a straight line, and the length of wear-resisting welt extends to and takes out about 3m, cuts into the wear-resisting welt of different length as required after the pressure forming finishes. And forging the forging stock, and then performing mechanical forming processing, including welding and processing forming of the auxiliary part, the mounting hole and the hoisting ring of the wear-resistant lining plate.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the spirit and scope of the invention, and these modifications and adaptations should be considered within the scope of the invention.
Claims (10)
1. A forging seat for forming a high-L-shaped wear-resistant lining plate comprises an upper seat and a lower seat, wherein the upper seat and the lower seat are matched for use; the first groove and the second groove enclose to form a high L-shaped wear-resistant lining plate forming space.
2. The forging seat for forming the high-L-shaped wear-resistant lining plate according to claim 1, wherein the first groove is formed by sequentially connecting a mounting surface forming surface, a first splicing surface forming surface and a first lifting surface forming surface.
3. The forging and pressing seat for forming the high-L-shaped wear-resistant lining plate according to claim 2, wherein the second groove is formed by sequentially connecting a second splicing surface forming surface, a crushing surface forming surface, a transition surface forming surface, a second lifting surface forming surface and a lifting top surface forming surface.
4. The forging seat for forming the high-L-shaped wear-resistant lining plate according to claim 3, wherein a lifting angle of a first lifting surface formed by the first lifting surface forming surface is 10-50 degrees, a lifting angle of a second lifting surface formed by the second lifting surface forming surface is 10-50 degrees, and the width of the mounting surface forming surface is 100-800 mm.
5. The forging seat for forming the high-L-shaped wear-resistant lining plate according to claim 3, wherein the forming surface of the lifting top surface is a curved surface, a plane or a surface formed by two planes with an acute included angle or an obtuse included angle; the lead of the curved surface is a line segment obtained from a circle, an ellipse, a parabola or a wavy line; the width of the lifting top surface forming surface is 1-200 mm.
6. The forging seat for forming the high-L-shaped wear-resistant lining plate according to claim 3, wherein the forming surface of the crushing surface is a plane, a curved surface or a concave-convex surface; the generatrix of the curved surface is a straight line or an arc line, or the lead of the curved surface is a sawtooth line, a wavy line or an arc line.
7. The forging seat for forming the high-L-shaped wear-resistant lining plate according to claim 3, wherein the first lifting surface forming surface, the lifting top surface forming surface and the second lifting surface forming surface enclose one or a combination of two of a trapezoid, a triangle, a rectangle, a herringbone and a semicircle with the height of 100-500 mm.
8. The forging seat for forming the high-L-shaped wear-resistant lining plate according to claim 3, wherein the transition surface forming surface is an arc surface or a plane surface.
9. The high L wear liner swage mount of claim 8 wherein the second lifting surface land to the crushing surface land is formed by a transition surface land linear transition.
10. The liner plate forming method based on the forging seat for forming the high-L-shaped wear-resistant liner plate as claimed in any one of claims 1 to 9 is characterized by comprising the following steps of:
A. forging and pressing the steel billet into a square billet by using a forging press;
B. forging and pressing the square billet into a triangular billet,
C. replacing and installing the lower seat with the first groove, forging and pressing the lower seat into a primary blank, and finishing the molding of the installation surface, the first splicing surface and the first lifting surface;
D. and replacing and installing the upper seat with the second groove, and mutually matching the upper seat and the lower seat to continue extending and precisely forming the primary blank until the second splicing surface, the crushing surface, the transition surface, the second lifting surface and the lifting top surface are formed, so that the forming of the high-L-shaped wear-resistant lining plate is completed.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110226389.1A CN113020524A (en) | 2021-03-01 | 2021-03-01 | Forging seat for forming high-L-shaped wear-resistant lining plate and lining plate forming method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110226389.1A CN113020524A (en) | 2021-03-01 | 2021-03-01 | Forging seat for forming high-L-shaped wear-resistant lining plate and lining plate forming method |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20170312809A1 (en) * | 2014-10-09 | 2017-11-02 | Showa Denko K.K. | Forging method and forging device |
| CN211489477U (en) * | 2019-07-09 | 2020-09-15 | 攀枝花贝氏体耐磨管道有限公司 | Forging and pressing seat for forming wear-resistant lining plate of semi-autogenous mill |
| CN111872293A (en) * | 2020-06-04 | 2020-11-03 | 紫荆浆体管道工程股份公司 | Preparation method of forging-rolling lining plate with longitudinal flow line |
| CN212019281U (en) * | 2020-01-20 | 2020-11-27 | 紫荆浆体管道工程股份公司 | Forming forging seat for L-shaped wear-resistant lining plate of semi-autogenous mill and lining plate |
-
2021
- 2021-03-01 CN CN202110226389.1A patent/CN113020524A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20170312809A1 (en) * | 2014-10-09 | 2017-11-02 | Showa Denko K.K. | Forging method and forging device |
| CN211489477U (en) * | 2019-07-09 | 2020-09-15 | 攀枝花贝氏体耐磨管道有限公司 | Forging and pressing seat for forming wear-resistant lining plate of semi-autogenous mill |
| CN212019281U (en) * | 2020-01-20 | 2020-11-27 | 紫荆浆体管道工程股份公司 | Forming forging seat for L-shaped wear-resistant lining plate of semi-autogenous mill and lining plate |
| CN111872293A (en) * | 2020-06-04 | 2020-11-03 | 紫荆浆体管道工程股份公司 | Preparation method of forging-rolling lining plate with longitudinal flow line |
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