CN115106389A - EPS treatment method for hot-rolled plate coil with excellent cold bending performance - Google Patents
EPS treatment method for hot-rolled plate coil with excellent cold bending performance Download PDFInfo
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- CN115106389A CN115106389A CN202210840507.2A CN202210840507A CN115106389A CN 115106389 A CN115106389 A CN 115106389A CN 202210840507 A CN202210840507 A CN 202210840507A CN 115106389 A CN115106389 A CN 115106389A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
- B21B45/06—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing of strip material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C43/00—Devices for cleaning metal products combined with or specially adapted for use with machines or apparatus provided for in this subclass
Abstract
The invention discloses a hot-rolled plate coil EPS treatment method with excellent cold bending performance, and relates to the technical field of surface treatment of automobile steel plates. The invention relates to an EPS (expandable polystyrene) treatment method for a hot-rolled plate coil with excellent cold bending performance, which is characterized in that a metal plate passes through a slurry injection impeller device and is subjected to EPS treatment in a vertically symmetrical distribution manner along the metal plate, the slurry injection impeller device comprises slurry impellers fixedly distributed on the upper surface and the lower surface of the metal plate, the impellers are compressed air type shot blasting machines, and the slurry impellers are fixed based on iron oxide layers on the upper surface and the lower surface of the metal plate which can be processed by EPS; according to the strength grade and the cold bending performance requirements of the metal plate material, reasonable EPS process parameters such as slurry injection speed, slurry flow injection angle, strip steel threading speed and the like are further optimized, so that the metal plate obtained after EPS treatment has good cold bending performance; meanwhile, the fatigue performance of the metal plate is improved, and the method has extremely high application value and economic value.
Description
Technical Field
The invention relates to the technical field of surface treatment of automobile steel plates, in particular to an EPS (expanded polystyrene) treatment method for a hot-rolled plate coil with excellent cold bending performance.
Background
Sheet metal production typically requires the passage of heat, rolling and cooling and in most cases the surface of the sheet metal must be treated before it can be used to provide a surface suitable for the product to be worked, in order to paint the metal surface or for other coating purposes such as galvanising, aluminium-silicon plating. The most conventional method for removing the iron oxide layer on the surface of the metal plate is a 'pickling' process, and because the 'pickling' treatment has certain corrosivity and pollution, in recent years, the EPS treatment mode is widely applied, and the iron oxide layer is removed by using a slurry (water and abrasive mixture) spraying device.
EPS is a short name of slurry spraying technology, and the basic principle of the EPS is that a mixture of hard steel grit and water serving as a working medium is used for spraying the upper surface and the lower surface of a steel plate, and iron oxide scales on the surface of the steel plate are removed under the action of impact force, so that the steel plate becomes a smooth and clean surface. The EPS can remove the pretreatment processes of acid washing, shot blasting, painting and the like, green and clean production is realized, but the EPS treatment belongs to a physical mode for removing an iron oxide layer on the surface of a metal, the slurry injection can cause certain damage to the surface of the metal plate, particularly, the cold bending performance can be reduced to a certain extent compared with that of a hot rolled plate, and the normal use of the material can be influenced when the cold bending performance is serious. Particularly in the automobile industry, the cold bending performance is taken as an important index for measuring the toughness of the material, is closely related to the safety performance of the automobile, and has important significance for developing related researches. After EPS treatment, the surface of a hot-rolled plate coil is uneven and has a gully-shaped appearance, the forming performance and the fatigue life of the material are reduced, and the popularization of products after EPS treatment in the market, particularly the application in automobile beam safety parts, is restricted.
Through search, relevant patents have been published for solving the above-mentioned deficiencies. For example, the Chinese patent application number is: 2007800335291, application date is: day 27 of 2007, publication: on 26.8.2009, a slurry blasting apparatus for descaling sheet metal is disclosed, which provides an EPS descaling apparatus for descaling which is simpler and does not require treatment with harmful chemicals, and overcomes the disadvantages associated with the existing apparatus and method for descaling sheet metal, and consists of an uncoiler, a straightener, an EPS processing unit, an oiler, and a coiler. But the selection of equipment process parameters and the performance of the descaled material were not studied.
Also, for example, the Chinese patent application number is: 2011800031220, application date is: 2011, 13 th of 9 and application publication date: on day 19/9/2012, a method is disclosed for preparing rust inhibitive sheet metal by descaling using a slurry cast descaling cell with improved sand flow, by controlling the slurry discharge rate and the type and amount of sand in the slurry mixture, to impart rust inhibitive properties to the sheet metal, eliminating the need to oil the product to rust inhibitive. However, the patent does not mention the influence of the improved slurry on various properties of the material.
And as the Chinese patent application number is: 2015106502932, application date is: the 10 th and 9 th days in 2015 and the application publication date are as follows: 2016, 3, 9 and discloses a nozzle quick-change device in an abrasive slurry jet descaling device for strip steel, wherein a plurality of abrasive slurry nozzles with the same or different types and specifications are arranged on the circumference of a rotatable nozzle disc, and each nozzle can be respectively butted with an abrasive slurry inlet pipe by rotating the nozzle disc, so that the nozzles can be automatically and quickly changed. The descaling process and material properties are not described.
It can be seen that the existing EPS treatment technology focuses more on devices and slurry, and the cold bending performance of EPS products is rarely studied.
Disclosure of Invention
1. Technical problem to be solved by the invention
Aiming at the problems of research on the cold bending performance of EPS products in the existing EPS treatment technology, the invention provides an EPS treatment method of a hot rolled plate coil with excellent cold bending performance.
2. Technical scheme
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
according to the strength grade and the cold bending performance requirements of a metal plate, the metal plate passes through an EPS treatment unit, and the EPS treatment unit comprises slurry injection impeller devices which are symmetrically arranged up and down, so that EPS treatment is performed on the surface of the metal plate to remove an iron oxide layer on the surface of the metal; in the EPS treatment, the slurry spraying speed is 30-60 m/s, the slurry flow is 500-2500 kg/min, the spraying incidence angle is 80-120 degrees, the strip steel threading speed is 0-40 m/min, and the surface roughness of the metal plate after EPS treatment is 2.0-5.0 um.
According to the further technical scheme, in EPS treatment of a metal plate with the strength level of below 700Mpa, the slurry spraying speed is preferably 40-45 m/s, the slurry flow is preferably 800-1500 kg/min, the spraying incidence angle is preferably 85-95 degrees, the strip steel threading speed is preferably 5-25 m/min, and the surface roughness of the metal plate after EPS treatment is 2.5-3.5 microns. According to the strength grade and the cold bending performance requirements of the metal plate material, reasonable EPS process parameters such as slurry injection speed, slurry flow injection angle, strip steel threading speed and the like are further optimized, so that the metal plate obtained after EPS treatment has good cold bending performance; meanwhile, the fatigue property of the metal sheet is improved, and the application value and the economic value are extremely high.
According to a further technical scheme, the slurry injection impeller device comprises slurry impellers, after the slurry impellers are fixedly distributed on the upper surface and the lower surface of a metal plate, strip steel moves at a certain speed, the slurry impellers start to inject slurry to perform EPS treatment on the upper surface and the lower surface of the metal plate, and the metal plate after EPS treatment is coated with oil for corrosion prevention and/or is coiled for subsequent processing.
In a further technical scheme, the impeller equipment is a compressed air type shot blasting machine.
According to the further technical scheme, the slurry is a mixture of water and slurry abrasive, the slurry abrasive is cast steel grit, and the hardness of the cast steel grit is 46-65 HRC.
According to a further technical scheme, the hardness of the cast steel grit is 55-60 HRC.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
(1) according to the EPS treatment method of the hot-rolled plate coil with excellent cold bending performance, the metal plate passes through an EPS treatment unit according to the strength grade and the cold bending performance requirement of the metal plate, the EPS treatment unit comprises slurry injection impeller devices which are symmetrically arranged up and down, and the slurry injection impeller devices are symmetrically distributed up and down along the metal plate to perform EPS treatment; by optimizing reasonable EPS process parameters such as slurry injection speed, slurry flow injection angle, strip steel threading speed and the like, the metal plate obtained after EPS treatment has good cold bending performance; meanwhile, the fatigue property of the metal sheet is improved, and the application value and the economic value are extremely high;
(2) the slurry jet impeller device comprises a plurality of slurry impellers, wherein the slurry impellers are fixedly distributed on the upper surface and the lower surface of a metal plate, the fixing mode is not particularly limited, and the EPS treatment method is based on the EPS treatment of the upper and lower iron oxide layers of the metal plate.
Drawings
FIG. 1 is a photograph of a cold bending test result (a) and a cold bending test arc cross section metallographic phase (b) of example 1 of the present invention;
FIG. 2 is photographs of the results of the cold bending test (a) and the arc cross section metallographic phase (b) of comparative example 1 of the present invention;
FIG. 3 shows the results of the 120 ℃ bending test for the bending angle of comparative example 1;
FIG. 4 shows the results of the 90 DEG bending test of comparative example 1;
FIG. 5 is a metallographic photograph of a circular arc cross section of the cold bending test in example 2;
FIG. 6 is a metallographic photograph showing a circular arc cross section in the cold bending test in comparative example 2.
Detailed Description
For a further understanding of the invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings.
According to the strength grade and the cold bending performance requirement of the metal sheet, enabling the metal sheet to pass through an EPS (expandable polystyrene) processing unit, wherein the EPS processing unit comprises slurry injection impeller devices which are symmetrically arranged up and down, so that EPS processing is performed on the surface of the metal sheet to remove an iron oxide layer on the surface of the metal; in the EPS treatment, the slurry spraying speed is 30-60 m/s, the slurry flow is 500-2500 kg/min, the spraying incidence angle is 80-120 degrees, the strip steel threading speed is 0-40 m/min, and the surface roughness of the metal plate after EPS treatment is 2.0-5.0 um; according to the strength grade and the cold bending performance requirement of the metal plate, the metal plate penetrates through a slurry jet impeller device and is distributed and arranged in a vertically symmetrical mode along the metal plate to perform EPS treatment, and therefore an EPS treatment product with excellent cold bending performance is obtained.
For the metal plate with the strength grade of below 700Mpa, in the EPS treatment, the slurry spraying speed is preferably 40-45 m/s, the slurry flow is preferably 800-1500 kg/min, the spraying incidence angle is preferably 85-95 degrees, the threading speed of the strip steel is preferably 5-25 m/min, and the surface roughness of the metal plate after the EPS treatment is 2.5-3.5 um. According to the strength grade and the cold bending performance requirements of the metal plate material, reasonable EPS process parameters such as slurry injection speed, slurry flow injection angle, strip steel threading speed and the like are further optimized, so that the metal plate obtained after EPS treatment has good cold bending performance; meanwhile, the fatigue property of the metal plate is improved, and the application value and the economic value are extremely high. The slurry spraying impeller device comprises slurry impellers, the slurry impellers are fixedly distributed on the upper surface and the lower surface of a metal plate, strip steel moves at a certain speed, the slurry impellers start to spray slurry to perform EPS treatment on the upper surface and the lower surface of the metal plate, and the metal plate subjected to EPS treatment is coated with oil for corrosion prevention and/or is coiled for subsequent processing.
In this embodiment, the impeller device is a compressed air type shot blasting machine, and the fixing mode of the slurry impeller is not particularly limited, so that the upper and lower iron oxide layers of the metal plate can be EPS-treated. The slurry is a mixture of water and a slurry abrasive, the slurry abrasive is cast steel grit, and the hardness of the cast steel grit is 46-65 HRC.
Furthermore, the hardness of the cast steel grit is 55-60 HRC.
Example 1
In the EPS treatment method of the hot rolled coil excellent in cold bending property of this example, the yield strength of the metal plate was 540Mpa, the material thickness was 8mm, and the cold bending property transverse specimen d ═ a (d is the bending diameter, and a is the specimen thickness).
8 slurry impellers are symmetrically distributed up and down along a metal plate by adopting compressed air type slurry impellers, EPS treatment process parameters are that the slurry injection speed is 43m/s, the slurry flow is 950kg/min, the injection incident angle is 90 degrees, the slurry injection strip steel coverage rate is 100 percent, the strip steel threading speed is 15m/min, the slurry abrasive is cast steel sand, the hardness of the cast steel sand is 58HRC, and the surface roughness after EPS treatment is 3.0 um.
Comparative example 1
8 slurry impellers are symmetrically distributed up and down along a metal plate by adopting a compressed air type slurry turbine, EPS treatment process parameters are that the slurry injection speed is 50m/s, the slurry flow is 1200kg/min, the injection incident angle is 90 degrees, the slurry injection strip steel coverage rate is 100 percent, the strip steel threading speed is 10m/min, the slurry abrasive is cast steel sand, the hardness of the cast steel sand is 58HRC, and the surface roughness after EPS treatment is 4.0 um.
The cold bending performance of the metal plates obtained in example 1 and comparative example 1 is tested:
taking a transverse sample 120 x 35mm, and performing a cold bending test according to a bending radius d ═ a and a bending angle of 180 degrees, wherein the outer side of the bending radius of the cold bending sample in the example 1 is smooth and has no crack, the surface texture of the outer side of the bending radius of the cold bending sample in the comparative example 1 is coarsened, and the metallographic analysis is further performed, and as shown in figures 1 and 2, the metal surface layer has micro cracks; the bending angle of the cold bending test of the comparative example 1 is further changed, the test result is shown in figures 3 and 4, and the surface texture coarsening can be seen on the outer side of the bending radius of the cold bending test sample with the bending angle of 120 degrees; the outer side of the bending radius of the cold bending sample with the bending angle of 90 degrees is smooth and has no surface texture coarsening.
Example 2
The basic structure of the EPS processing method for a hot-rolled coil with excellent cold bending performance of the embodiment is the same as that of the embodiment 1, and the difference and the improvement are that: the yield strength of the metal plate is 472MPa, the thickness of the metal plate is 5mm, and a transverse cold bending property sample d is 0.5a (d is the bending diameter and a is the thickness of the sample);
8 slurry impellers are symmetrically distributed up and down along a metal plate by adopting a compressed air type slurry turbine, EPS treatment process parameters are that the slurry injection speed is 40m/s, the slurry flow is 900kg/min, the injection incident angle is 90 degrees, the slurry injection strip steel coverage rate is 100 percent, the strip steel threading speed is 20m/min, the slurry abrasive is cast steel sand, the hardness of the cast steel sand is 58HRC, and the surface roughness after EPS treatment is 2.8 um.
Comparative example 2
8 slurry impellers are symmetrically distributed up and down along a metal plate by adopting compressed air type slurry impellers, EPS treatment process parameters are that the slurry injection speed is 55m/s, the slurry flow is 1500kg/min, the injection incident angle is 90 degrees, the slurry injection strip steel coverage rate is 100 percent, the strip steel threading speed is 12m/min, the slurry abrasive is cast steel sand, the hardness of the cast steel sand is 58HRC, and the surface roughness after EPS treatment is 4.6 um.
The cold bending performance of the metal plates obtained in the example 2 and the comparative example 2 is detected:
a transverse sample with the thickness of 120 × 35mm is taken, and a cold bending test is performed according to the bending radius d ═ a and the bending angle of 180 degrees, as shown in fig. 5 and 6, the outer side of the bending radius of the cold-bent sample in the example 2 is smooth and has no cracks, the surface texture of the outer side of the bending radius of the cold-bent sample in the comparative example 2 is coarsened, and the metal surface layer has microcracks.
The results show that the metal plate obtained by the EPS treatment method for the hot rolled plate with excellent cold bending performance provided by the invention has good cold bending performance, is beneficial to improving the fatigue performance of the material, and has extremely high application value and economic value.
The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the invention, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the invention.
Claims (6)
1. A hot-rolled plate coil EPS treatment method with excellent cold bending performance is characterized in that: according to the strength grade and the cold bending performance requirement of the metal plate, enabling the metal plate to pass through an EPS (expandable polystyrene) processing unit, wherein the EPS processing unit comprises slurry injection impeller devices which are symmetrically arranged up and down, and the slurry injection impeller devices are symmetrically distributed and arranged up and down along the metal plate to perform EPS processing; in the EPS treatment, the slurry spraying speed is 30-60 m/s, the slurry flow is 500-2500 kg/min, the spraying incidence angle is 80-120 degrees, the strip steel threading speed is 0-40 m/min, and the surface roughness of the metal plate after EPS treatment is 2.0-5.0 um.
2. The EPS treatment method of the hot-rolled coil with excellent cold bending property of claim 1, wherein the method comprises the following steps: in the EPS treatment, the slurry injection speed is 40-45 m/s, the slurry flow is 800-1500 kg/min, the injection incident angle is 85-95 degrees, and the strip steel threading speed is 5-25 m/min.
3. The EPS treatment method for hot-rolled plate coils with excellent cold bending performance according to claim 2, characterized in that: the slurry spraying impeller device comprises a slurry impeller, wherein a plurality of slurry impellers are fixedly distributed on the upper surface and the lower surface of a metal plate, strip steel moves forwards at a certain speed, the slurry impellers start to spray slurry to perform EPS treatment on the upper surface and the lower surface of the metal plate, and the metal plate after EPS treatment is coated with oil, is prevented from corrosion and/or is coiled so as to be processed subsequently.
4. The EPS treatment method for hot-rolled plate coils with excellent cold bending performance according to claim 3, characterized in that: the impeller apparatus is a compressed air type shot blasting machine.
5. The EPS treatment method of the hot-rolled coil with excellent cold bending property of claim 3, wherein the method comprises the following steps: the slurry is a mixture of water and a slurry abrasive, the slurry abrasive is cast steel grit, and the hardness of the cast steel grit is 46-65 HRC.
6. The EPS treatment method of the hot-rolled coil with excellent cold bending property of claim 5, wherein the EPS treatment method comprises the following steps: the hardness of the cast steel grit is 55-60 HRC.
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| CN202210840507.2A CN115106389A (en) | 2022-07-18 | 2022-07-18 | EPS treatment method for hot-rolled plate coil with excellent cold bending performance |
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| CN202210840507.2A CN115106389A (en) | 2022-07-18 | 2022-07-18 | EPS treatment method for hot-rolled plate coil with excellent cold bending performance |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115770796A (en) * | 2022-11-14 | 2023-03-10 | 鞍钢股份有限公司 | Method for green and clean surface treatment of steel plate iron scale |
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- 2022-07-18 CN CN202210840507.2A patent/CN115106389A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115770796A (en) * | 2022-11-14 | 2023-03-10 | 鞍钢股份有限公司 | Method for green and clean surface treatment of steel plate iron scale |
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