CN110576214A - trimming quality control method - Google Patents
trimming quality control method Download PDFInfo
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- CN110576214A CN110576214A CN201910877104.3A CN201910877104A CN110576214A CN 110576214 A CN110576214 A CN 110576214A CN 201910877104 A CN201910877104 A CN 201910877104A CN 110576214 A CN110576214 A CN 110576214A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D19/00—Shearing machines or shearing devices cutting by rotary discs
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D33/00—Accessories for shearing machines or shearing devices
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Abstract
the invention discloses a trimming quality control method, which comprises the following steps: controlling the edge cutting speed of the circle shear to be increased from 0m/min to 120-150m/min, and keeping the edge cutting speed of the circle shear at 120-150 m/min; adjusting the side clearance of the disc shear and the overlapping amount of the disc shear according to the thickness of the strip steel; controlling the circle shear to cut edges of the strip steel, checking the quality of the edge after edge cutting, and adjusting the side clearance of the circle shear and the overlapping amount of the circle shear according to the quality of the edge; after the welding seam of the strip steel passes through the disc shear, the side gap of the disc shear and the overlapping amount of the disc shear are adjusted according to the thickness of the next coil of strip steel. Therefore, the trimming speed is moderate, the trimming quality is ensured, the loss of the shearing edge of the disc shear is reduced, and frequent speed increase and decrease are avoided, so that the production can be stably carried out; the proper shearing force can be provided by adjusting the side clearance of the disc shear and the overlapping amount of the disc shear, and the quality of the trimming production of the strip steel is effectively ensured.
Description
Technical Field
the invention relates to the technical field of acid rolling quality control, in particular to a trimming quality control method suitable for 980 high-strength steel.
background
with the trend of light weight of automobiles, high-strength sheet steel becomes the development direction of various automobile sheet production enterprises, and therefore, various large steel mills are dedicated to the development and production of 980 high-strength steel.
980, the high-strength steel has high strength, and the strip steel can generate huge impact on the shearing edge of the disc shear in the high-speed production process of the strip steel, so that the shearing edge is easy to break, and the defect of fleshiness at the edge is easily caused; if the edge is cut at a low speed, all the edges of the strip steel are cut off under the condition of insufficient inertia, the edges are easy to generate edge wire defects, and the cut-off surfaces are easy to generate sawtooth edge defects after rolling, so that the cutting edge of the disc shear is seriously abraded, and the subsequent production is not facilitated.
In conclusion, how to ensure the trimming quality in the continuous production of 980 high-strength steel strip steel is a problem to be solved urgently by technical personnel in the field at present.
disclosure of Invention
In view of the above, the present invention aims to provide a trimming quality control method, which can effectively control the trimming quality in 980 high-strength steel strip continuous production, and reduce the edge defects of the steel strip and the abrasion damage to a circle shear.
In order to achieve the above purpose, the invention provides the following technical scheme:
A trimming quality control method comprises the following steps:
controlling the trimming speed of the circle shear to be increased from 0m/min to a first trimming speed, and keeping the trimming speed of the circle shear at the first trimming speed, wherein the first trimming speed is 120-150 m/min;
adjusting the side clearance of the circle shear and the overlapping amount of the circle shear according to the thickness of the strip steel;
Controlling the circle shear to cut edges of the strip steel, checking the quality of the edge after edge cutting, and adjusting the side clearance of the circle shear and the overlapping amount of the circle shear according to the quality of the edge;
and after the welding seam of the strip steel passes through the disc shear, adjusting the side gap of the disc shear and the overlapping amount of the disc shear according to the thickness of the next coil of strip steel.
preferably, the controlling the trimming speed of the disc shear to be increased from 0m/min to the first trimming speed comprises:
Controlling the trimming speed of the disc shear to be increased from 0m/min to a second trimming speed, wherein the second trimming speed is 60-75 m/min;
Keeping the trimming speed of the circle shear at the second trimming speed for 5 s;
and controlling the trimming speed of the circle shear to be increased from the second trimming speed to the first trimming speed.
Preferably, the controlling the trimming speed of the circle shear to be increased from 0m/min to a second trimming speed comprises:
and controlling the trimming speed of the disc shear to be increased from 0m/min to the second trimming speed at a constant speed.
preferably, the controlling the trimming speed of the circle shear from the second trimming speed to the first trimming speed comprises:
And controlling the trimming speed of the circle shear to be increased from the second trimming speed to the first trimming speed at a constant speed.
Preferably, the adjusting of the side gap of the circle shear and the overlapping amount of the circle shear according to the thickness of the strip steel comprises:
The side clearance of circle shear with the thickness of belted steel is positive correlation, the overlap amount of circle shear with the thickness of belted steel is negative correlation.
Preferably, the adjusting the side gap of the circle shear and the overlapping amount of the circle shear according to the thickness of the following strip steel comprises:
the side clearance of the disc shear is positively correlated with the thickness of the next coil of strip steel, and the overlapping amount of the disc shear is negatively correlated with the thickness of the next coil of strip steel.
preferably, the inspecting the quality of the trimmed edge and the adjusting the overlap amount of the side gap of the circle shear and the circle shear according to the quality of the edge includes:
when the width ratio of the cut surface to the torn surface of the strip steel is 0.3-0.5, the edge quality is qualified;
When the width ratio of the cut surface to the tearing surface of the strip steel is more than 0.5, gradually increasing the side clearance of the disc by taking 0.05mm as measurement, and gradually reducing the overlapping amount of the disc by taking 0.05mm as measurement until the width ratio of the cut surface to the tearing surface of the strip steel is 0.3-0.5;
When the width ratio of the strip steel cutting surface to the tearing surface is less than 0.3, the side clearance of the disc is gradually reduced by taking 0.05mm as measurement, the overlapping amount of the disc is gradually increased by taking 0.05mm as measurement until the width ratio of the strip steel cutting surface to the tearing surface is 0.3-0.5.
Preferably, the controlling the circle shear to cut the edge of the strip steel comprises:
The total width of the cutting edge is controlled to be 16-60 mm.
Preferably, the controlling the total trimming width to be 16-60mm comprises:
controlling the widths of the two side trimming edges to be the same, and controlling the width of the single side trimming edge to be 8-30 mm.
the invention provides a trimming quality control method, which comprises the following steps:
controlling the edge cutting speed of the circle shear to be increased from 0m/min to 120-150m/min, and keeping the edge cutting speed of the circle shear at 120-150 m/min;
adjusting the side clearance of the disc shear and the overlapping amount of the disc shear according to the thickness of the strip steel;
controlling the circle shear to cut edges of the strip steel, checking the quality of the edge after edge cutting, and adjusting the side clearance of the circle shear and the overlapping amount of the circle shear according to the quality of the edge;
after the welding seam of the strip steel passes through the disc shear, the side gap of the disc shear and the overlapping amount of the disc shear are adjusted according to the thickness of the next coil of strip steel.
The production is carried out by increasing the trimming speed of the circle shear to the first trimming speed and maintaining the speed, so that the trimming speed is moderate, the trimming quality is ensured, and the loss of the shearing edge of the circle shear is reduced; on the other hand, frequent speed increase and reduction are avoided, so that the production can be stably carried out.
The side clearance of the disc shear and the overlapping amount of the disc shear are adjusted according to the edge quality and the thickness of the strip steel, so that a proper shearing force can be provided to cut off the strip steel, and the problem of head buckling caused by an overlarge shearing force is avoided, thereby effectively ensuring the quality of strip steel trimming production.
Drawings
in order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic flow chart of a first embodiment of the trimming quality control method according to the present invention;
FIG. 2 is a schematic flowchart of a second embodiment of the trimming quality control method according to the present invention;
fig. 3 is a graph showing the trimming speed of the circle shear versus time in the trimming quality control method according to the present invention.
in fig. 1-3:
t is time, V is speed, a is second trimming speed, b is first trimming speed, T1 is the time required for the trimming speed to increase from 0 to the second trimming speed, and T2 is the time required for the trimming speed to increase from 0 to the first trimming speed.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
the core of the invention is to provide a trimming quality control method, which can effectively control the trimming quality in the continuous production of strip steel and reduce the edge defects of the strip steel and the abrasion damage to a circle shear.
referring to fig. 1 to 3, fig. 1 is a schematic flow chart of a first embodiment of the trimming quality control method according to the present invention; FIG. 2 is a schematic flowchart of a second embodiment of the trimming quality control method according to the present invention; fig. 3 is a graph showing the trimming speed of the circle shear versus time in the trimming quality control method according to the present invention.
Referring to fig. 1, the trimming quality control method provided in this embodiment includes:
Step S1, controlling the trimming speed of the circle shear from 0m/min to a first trimming speed, and keeping the trimming speed of the circle shear at the first trimming speed which is 120-;
Step S2, adjusting the side clearance of the disc shear and the overlapping amount of the disc shear according to the thickness of the strip steel;
Step S3, controlling the disc shear to cut edges of the strip steel, checking the quality of the edge after cutting the edges, and adjusting the side clearance of the disc shear and the overlapping amount of the disc shear according to the quality of the edge;
And step S4, after the welding seam of the strip steel passes through the disc shear, adjusting the side gap of the disc shear and the overlapping amount of the disc shear according to the thickness of the next coil of strip steel.
It should be noted that in step S1, the trimming speed of the circle shear is controlled to be increased from 0m/min to the first trimming speed and kept at the first trimming speed, on one hand, the trimming speed is 120-150m/min, and the speed is moderate, so as to avoid the phenomenon that the edge of the strip steel is completely cut off due to too low trimming speed or the edge of the strip steel is excessively cut off due to too high trimming speed, which results in the defect of too much edge of the strip steel; on the other hand, frequent speed increase and reduction is avoided, and stable production is facilitated.
In step S2, since the overlapping amount of the disc shear affects the shearing force of the disc shear and the side gap of the disc shear affects the width ratio of the cut surface to the torn surface, the side gap of the disc shear and the overlapping amount of the disc shear need to be adjusted according to the thickness of the strip steel in order to ensure the quality of the cut edge.
Preferably, the side gap of the disc shear is positively correlated with the thickness of the strip steel, and the overlapping amount of the disc shear is negatively correlated with the thickness of the strip steel.
Preferably, the model of the side gap and the overlap amount of the circle shear can be shown in table 1, when the thickness t of the strip steel is less than or equal to 2.5mm, the side gap of the circle shear is 0.30mm, and the overlap amount is 0.20 mm; when the thickness of the strip steel is more than 2.5mm and t is less than or equal to 3.0mm, the side clearance of the circle shear is 0.35mm, and the overlapping amount is 0.10 mm; when the thickness of the strip steel is more than 3.0mm and t is less than or equal to 3.5mm, the side clearance of the circle shear is 0.40mm, and the overlapping amount is 0.10 mm; when the thickness of the strip steel is more than 3.5mm and t is less than or equal to 4.0mm, the side clearance of the circle shear is 0.50mm, and the overlapping amount is 0.10 mm; when the thickness of the strip steel is more than 4.0mm and t is less than or equal to 4.5mm, the side clearance of the circle shear is 0.60mm, and the overlapping amount is 0 mm; when the thickness of the strip steel is more than 4.5mm and t is less than or equal to 5.0mm, the side clearance of the circle shear is 0.60mm, and the overlapping amount is-0.10 mm; when the thickness of the strip steel is more than 5.0mm and t is less than or equal to 5.5mm, the side clearance of the circle shear is 0.65mm, and the overlapping amount is-0.10 mm; when the thickness of the strip steel is more than 5.5mm and t is less than or equal to 6.0mm, the side clearance of the circle shear is 0.70mm, and the overlapping amount is-0.10 mm.
TABLE 1 circle shear side gap and circle shear overlap data model table
in step S3, the quality of the edge after trimming may be detected manually by an operator or may be detected by a machine using a detection instrument.
it should be noted that in step S4, when the strip steel is continuously produced, the previous strip steel is welded to the next strip steel, and since the thickness of the next strip steel may be different from the thickness of the previous strip steel, the side gap of the circle shear and the overlapping amount of the circle shear need to be readjusted according to the thickness of the next strip steel, so as to ensure the quality of the cut edge of the strip steel.
in the embodiment, the production is carried out by increasing the trimming speed of the circle shear to the first trimming speed and maintaining the speed, so that on one hand, the trimming speed ensures the trimming quality and reduces the loss of the shearing edge of the circle shear; on the other hand, frequent speed increase and reduction are avoided, so that the production can be stably carried out.
Meanwhile, the side clearance of the disc shear and the overlapping amount of the disc shear are adjusted according to the edge quality and the thickness of the strip steel, so that a proper shearing force can be provided for cutting off the strip steel, and the problem of head buckling caused by an overlarge shearing force is avoided, thereby effectively ensuring the quality of strip steel trimming production.
on the basis of the above embodiment, referring to fig. 2, step S1 may include:
step S11, the trimming speed of the disc shear is controlled to be increased from 0m/min to a second trimming speed, and the second trimming speed is 60-75 m/min;
Step S12, keeping the trimming speed of the circle shear at a second trimming speed of 5S;
and step S13, controlling the trimming speed of the circle shear to be increased from the second trimming speed to the first trimming speed.
It should be noted that in the process of increasing the trimming speed of the circle shear from 0 to the second trimming speed in step S11, the trimming speed versus time curve of the circle shear may have any shape as long as the trimming speed of the circle shear increases with time.
preferably, referring to fig. 3, the trimming speed of the circle shear can be increased from 0 to the second trimming speed at a constant speed.
It should be noted that in step S12, the speed of the circle shear is maintained at the second trimming speed 5S to reduce the wear on the cutting edge of the circle shear during the continuous acceleration.
It should be noted that in the process of increasing the trimming speed of the circle shear from the second trimming speed to the first trimming speed in step S13, the trimming speed versus time curve of the circle shear may have any shape as long as the trimming speed of the circle shear increases with time.
Preferably, referring to fig. 3, the trimming speed of the circle shear can be increased from the first trimming speed to the first trimming speed at a constant speed.
On the basis of the above embodiment, referring to fig. 2, step S3 may include:
Step S31, controlling a circle shear to cut edges of the strip steel;
and step S32, checking the quality of the edge after trimming, and adjusting the side clearance of the circle shear and the overlapping amount of the circle shear according to the quality of the edge.
it should be noted that, in step S31, in order to avoid the jamming of the circle shears caused by too small trimming amount and failure to complete trimming or too large trimming amount, the trimming amount of the strip steel needs to be designed reasonably in the trimming process.
Preferably, the total trimming width can be controlled to be 16-60mm so as to ensure the trimming quality.
In order to ensure the quality of the trimming at the two sides of the strip steel, preferably, the widths of the trimming at the two sides can be controlled to be the same, and the width of the trimming at the single side is 8-30 mm.
in step S32, in order to avoid edge cracking of the rolled strip, the ratio of the width of the edge cut surface to the width of the tear surface may be selected as a basis for inspecting the edge quality of the strip.
preferably, when the width ratio of the cut surface to the torn surface of the strip steel is 0.3-0.5, the edge quality can be judged to be qualified;
When the width ratio of the cut surface and the tearing surface of the strip steel is more than 0.5, the side clearance of the disc can be gradually increased by taking 0.05mm as measurement, and the overlapping amount of the disc can be gradually reduced by taking 0.05mm as measurement until the width ratio of the cut surface and the tearing surface of the strip steel is 0.3-0.5;
when the width ratio of the strip steel cutting surface to the tearing surface is less than 0.3, the side clearance of the disc can be gradually reduced by taking 0.05mm as a measure, and the overlapping amount of the disc can be gradually increased by taking 0.05mm as a measure until the width ratio of the strip steel cutting surface to the tearing surface is 0.3-0.5.
Because the side clearance and the overlapping amount of the disc shear are finely adjusted according to the width ratio of the cut surface to the torn surface, the condition that the width ratio of the cut surface to the torn surface exceeds the qualified range is effectively avoided, and the trimming quality of the strip steel is ensured.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The method for controlling the quality of the cut edge provided by the invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (9)
1. A trimming quality control method is characterized by comprising the following steps:
controlling the trimming speed of the circle shear to be increased from 0m/min to a first trimming speed, and keeping the trimming speed of the circle shear at the first trimming speed, wherein the first trimming speed is 120-150 m/min;
Adjusting the side clearance of the circle shear and the overlapping amount of the circle shear according to the thickness of the strip steel;
Controlling the circle shear to cut edges of the strip steel, checking the quality of the edge after edge cutting, and adjusting the side clearance of the circle shear and the overlapping amount of the circle shear according to the quality of the edge;
And after the welding seam of the strip steel passes through the disc shear, adjusting the side gap of the disc shear and the overlapping amount of the disc shear according to the thickness of the next coil of strip steel.
2. The trimming quality control method according to claim 1, wherein the controlling of the trimming speed of the disc shear to be increased from 0m/min to the first trimming speed comprises:
Controlling the trimming speed of the disc shear to be increased from 0m/min to a second trimming speed, wherein the second trimming speed is 60-75 m/min;
keeping the trimming speed of the circle shear at the second trimming speed for 5 s;
And controlling the trimming speed of the circle shear to be increased from the second trimming speed to the first trimming speed.
3. The trimming quality control method according to claim 2, wherein the controlling of the raising of the trimming speed of the circle shear from 0m/min to a second trimming speed comprises:
And controlling the trimming speed of the disc shear to be increased from 0m/min to the second trimming speed at a constant speed.
4. The trim quality control method of claim 2, wherein the controlling the trim speed of the circle shear from the second trim speed to the first trim speed comprises:
And controlling the trimming speed of the circle shear to be increased from the second trimming speed to the first trimming speed at a constant speed.
5. the cut edge quality control method according to claim 1, wherein the adjusting of the side gap of the circle shear and the overlap amount of the circle shear according to the thickness of the strip steel comprises:
the side clearance of circle shear with the thickness of belted steel is positive correlation, the overlap amount of circle shear with the thickness of belted steel is negative correlation.
6. The scrap edge quality control method according to claim 1, wherein the adjusting of the side gap of the circle shear and the overlapping amount of the circle shear according to the thickness of the subsequent strip includes:
the side clearance of the disc shear is positively correlated with the thickness of the next coil of strip steel, and the overlapping amount of the disc shear is negatively correlated with the thickness of the next coil of strip steel.
7. The cut-edge quality control method according to any one of claims 1 to 6, wherein the checking of the quality of the edge portion after the cut-edge, and the adjusting of the side gap of the circle shear and the overlap amount of the circle shear according to the quality of the edge portion comprises:
When the width ratio of the cut surface to the torn surface of the strip steel is 0.3-0.5, the edge quality is qualified;
When the width ratio of the cut surface to the tearing surface of the strip steel is more than 0.5, gradually increasing the side clearance of the disc by taking 0.05mm as measurement, and gradually reducing the overlapping amount of the disc by taking 0.05mm as measurement until the width ratio of the cut surface to the tearing surface of the strip steel is 0.3-0.5;
when the width ratio of the strip steel cutting surface to the tearing surface is less than 0.3, the side clearance of the disc is gradually reduced by taking 0.05mm as measurement, the overlapping amount of the disc is gradually increased by taking 0.05mm as measurement until the width ratio of the strip steel cutting surface to the tearing surface is 0.3-0.5.
8. the strip edge trim quality control method according to claim 7, wherein the controlling the rotary shears to edge the strip steel comprises:
The total width of the cutting edge is controlled to be 16-60 mm.
9. the cut edge quality control method according to claim 8, wherein the controlling of the total cut edge width to be 16-60mm comprises:
controlling the widths of the two side trimming edges to be the same, and controlling the width of the single side trimming edge to be 8-30 mm.
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Application publication date: 20191217 |