CN114850618A - Cutting method for reducing edge cracks of steel plate - Google Patents
Cutting method for reducing edge cracks of steel plate Download PDFInfo
- Publication number
- CN114850618A CN114850618A CN202210609409.8A CN202210609409A CN114850618A CN 114850618 A CN114850618 A CN 114850618A CN 202210609409 A CN202210609409 A CN 202210609409A CN 114850618 A CN114850618 A CN 114850618A
- Authority
- CN
- China
- Prior art keywords
- cutting
- steel plate
- flame
- reducing
- edge cracks
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000005520 cutting process Methods 0.000 title claims abstract description 210
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 135
- 239000010959 steel Substances 0.000 title claims abstract description 135
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000010438 heat treatment Methods 0.000 claims abstract description 16
- 244000249914 Hemigraphis reptans Species 0.000 claims abstract description 8
- 235000009781 Myrtillocactus geometrizans Nutrition 0.000 claims abstract description 8
- 240000009125 Myrtillocactus geometrizans Species 0.000 claims abstract description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 21
- 239000001301 oxygen Substances 0.000 claims description 21
- 229910052760 oxygen Inorganic materials 0.000 claims description 21
- 238000005422 blasting Methods 0.000 claims description 19
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 claims description 18
- 238000010791 quenching Methods 0.000 claims description 14
- 230000000171 quenching effect Effects 0.000 claims description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 10
- 239000001294 propane Substances 0.000 claims description 9
- 239000002893 slag Substances 0.000 claims description 6
- 238000007664 blowing Methods 0.000 claims description 5
- 229910052742 iron Inorganic materials 0.000 claims description 5
- 238000005498 polishing Methods 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 4
- 239000007789 gas Substances 0.000 claims description 4
- 238000000227 grinding Methods 0.000 claims 1
- 238000007781 pre-processing Methods 0.000 claims 1
- 238000005336 cracking Methods 0.000 description 6
- 230000001276 controlling effect Effects 0.000 description 4
- 230000010485 coping Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 208000037656 Respiratory Sounds Diseases 0.000 description 3
- 229910000734 martensite Inorganic materials 0.000 description 3
- 239000002344 surface layer Substances 0.000 description 3
- 238000005496 tempering Methods 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K7/00—Cutting, scarfing, or desurfacing by applying flames
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K7/00—Cutting, scarfing, or desurfacing by applying flames
- B23K7/008—Preliminary treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K7/00—Cutting, scarfing, or desurfacing by applying flames
- B23K7/10—Auxiliary devices, e.g. for guiding or supporting the torch
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention relates to the technical field of steel plate cutting, in particular to a cutting method for reducing edge cracks of a steel plate, which comprises the following steps: pretreatment, heat treatment and double-gun thermal state cutting, wherein the double-gun thermal state cutting comprises the following steps: preheating the steel plate by using a previous flame cutting machine, wherein the length ratio of red flame at the head of the flame to blue flame at the root of the flame is 8-9: 1, so that the surface temperature of the steel plate before cutting is more than or equal to 120 ℃; and cutting the edge part of the steel plate by using the latter flame cutting machine, wherein the distance between the cutting nozzle and the steel plate is 6-8mm, and the cutting speed is 270-290 mm/min. The cutting method for reducing the edge cracks of the steel plate can reduce the crack generation condition of the cut steel plate and improve the quality of the steel plate.
Description
Technical Field
The invention relates to the technical field of steel plate cutting, in particular to a cutting method for reducing edge cracks of a steel plate.
Background
The steel plate provided by the related art can obtain a tempered martensite structure after heat treatment; since the martensite structure is hard and brittle, delayed cracking of the steel sheet often occurs after flame cutting, which leads to a reduction in the quality of the steel sheet.
Disclosure of Invention
The invention aims to provide a cutting method for reducing edge cracks of a steel plate, which can reduce the cracks generated after the steel plate is cut and improve the quality of the steel plate.
The invention is realized by the following steps:
the invention provides a cutting method for reducing edge cracks of a steel plate, which comprises the following steps:
pre-treating;
heat treatment; and the number of the first and second groups,
dual-gun thermal cutting, comprising:
preheating the steel plate by using a previous flame cutting machine, wherein the length ratio of red flame at the head of the flame to blue flame at the root of the flame is 8-9: 1, so that the surface temperature of the steel plate before cutting is more than or equal to 120 ℃;
and cutting the edge part of the steel plate by using the latter flame cutting machine, wherein the distance between the cutting nozzle and the steel plate is 6-8mm, and the cutting speed is 270-290 mm/min.
In an alternative embodiment, the distance between the previous torch cutter and the next torch cutter is 20-30 cm; the heap cooling time after cutting is more than or equal to 36h to room temperature.
In an alternative embodiment, when the steel plate is preheated by the previous flame cutting machine, the method further comprises adjusting the flame, and mixed gas of oxygen and propane is adopted, and the volume ratio of the oxygen to the propane is 5: 2.
In an alternative embodiment, the cutting oxygen flow is controlled to be within 5 ° of the vertical cutting torch when the steel plate is preheated by the previous torch cutting machine.
In an alternative embodiment, the latter torch cutting machine is used for cutting the edge of the steel plate, and specifically, the method further includes: when the cutting speed is too high, adjusting the spark bundles to deflect in the opposite direction, determining the normal cutting speed when the spark bundles are adjusted to be parallel to the cutting oxygen flow, and blowing the generated cutting slag by the air flow in the cutting process; after cutting, the cutting width is set to be 10-15mm, and the cutting length is set to be 25-35 mm.
In an alternative embodiment, the temperature of the heat treatment is 910 ± 10 ℃.
In an alternative embodiment, the step of heat treating specifically comprises:
quenching for H +30min when the thickness of the steel plate is more than or equal to 10mm and less than 20 mm;
quenching for 1.5 XH + (25-30) min when the thickness of the steel plate is more than or equal to 20mm and less than or equal to 50 mm; wherein H is the thickness of the steel plate.
In an alternative embodiment, the step of pre-treating specifically includes: and performing shot blasting on the steel plate to treat the iron scale on the surface.
In an alternative embodiment, the method further comprises: the cutting bench is leveled prior to the step of performing the two-gun thermal state cutting.
In an alternative embodiment, the method further comprises: and before the step of carrying out double-gun thermal state cutting, carrying out coping and polishing on the cutting track.
The invention has the following beneficial effects:
the cutting method for reducing the edge cracks of the steel plate comprises the following steps of carrying out double-gun thermal state cutting after heat treatment, wherein the steel plate is preheated by a previous flame cutting machine, the length ratio of red flame at the head of flame to blue flame at the root of flame is 8-9: 1, so that the surface temperature of the steel plate before cutting is more than or equal to 120 ℃; and cutting the edge part of the steel plate by using the latter flame cutting machine, wherein the distance between the cutting nozzle and the steel plate is 6-8mm, and the cutting speed is 270-290 mm/min. With through two flame cutting machines respectively when preheating and cutting, the flame condition when controlling respectively to and the interval of cutting torch and steel sheet during the cutting, and the speed of cutting, can reduce the problem of blasting effectively, and then improve the quality of cutting, the problem of the limit portion crackle of the steel sheet of reduction cutting appears.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed 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 first diagram showing the cracking of a steel sheet cut in example 1 of the present invention;
FIG. 2 is a second diagram showing the cracking of the cut steel sheet in example 1 of the present invention;
FIG. 3 is a third view showing the cracking of the cut steel sheet in example 1 of the present invention;
FIG. 4 is a first diagram showing the cracking of the cut steel sheet in example 2 of the present invention;
fig. 5 is a second diagram showing the cracking of the steel sheet after cutting in example 2 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, as 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. 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.
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 need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present invention, it should be noted that the terms "vertical", "parallel", and the like refer to the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship which the product of the present invention is usually placed in when used, and are only used for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
The invention provides a cutting method for reducing cracks on the edge of a steel plate, which can reduce the cracks generated on the steel plate when the steel plate is cut.
The cutting method for reducing edge cracks of a steel sheet according to the present invention can be applied to a steel sheet having a slab thickness of from 250 × 2000 × 3000 to 30 × 2200 × 10000 by rolling.
The cutting method for reducing the edge cracks of the steel plate comprises the following steps: pretreatment, heat treatment and double-gun thermal state cutting.
A step of pretreatment comprising: and (4) performing shot blasting on the steel plate, and treating the surface iron oxide.
The way of blasting the steel sheet is similar to the related art, for example: shot blasting (a cold treatment process) which is divided into shot blasting cleaning and shot blasting reinforcement, wherein the shot blasting cleaning aims to remove impurities such as surface oxide skin and improve appearance quality, and the shot blasting reinforcement is to continuously impact the surface of a workpiece to be reinforced by utilizing the flow velocity of shot (60-110m/s) moving at high speed so as to force the surface of the target and a surface layer (0.10-0.85mm) to change in a cyclic deformation process: 1. the microstructure is modified; 2. residual compressive stress is introduced into the non-uniform plastic deformation outer surface layer, and residual tensile stress is generated in the inner surface layer; 3. the outer surface roughness changes (Ra Rz). Influence: can improve the fatigue fracture resistance of materials/parts, prevent fatigue failure, plastic deformation and brittle fracture and prolong the fatigue life.
A step of heat treatment comprising: a heat treatment mode of quenching and tempering; after heat treatment a tempered martensitic structure is obtained.
Wherein the quenching temperature is 910 +/-10 ℃, for example: 900 deg.C, 905 deg.C, 910 deg.C, 915 deg.C, 920 deg.C, etc.
Further, the quenching time of the steel plate can be determined according to the thickness of the steel plate, wherein when the thickness of the steel plate is more than or equal to 10mm and less than 20mm, the quenching time is H +30 min; quenching for 1.5 XH + (25-30) min when the thickness of the steel plate is more than or equal to 20mm and less than or equal to 50 mm; wherein, H is the thickness of the steel plate, and the unit is as follows: mm.
The quenching time is determined according to different thicknesses of the steel plate, the stability of the steel plate structure can be accurately and reliably improved according to the different thicknesses of the steel plate, the internal stress of the steel plate is effectively eliminated, and the mechanical property of the steel plate is adjusted.
The tempering process after quenching may be established according to the quenching result, and is not particularly limited herein.
It should also be noted that after quenching, the stacks were collected and tempered within 48 hours.
After the steel plate is subjected to heat treatment, a flame cutting machine is adopted to cut the steel plate to length, the height of a cutting rack is confirmed before cutting, and the cutting rack is leveled; and the cutting track can be polished, so that the problems of pause and shake during the movement of the cutting machine are reduced, the phenomenon of blasting caused by the problems of shake and pause during the cutting of the steel plate is reduced, the edge of the cut steel plate is not easy to crack, and the quality of the cut steel plate is improved.
The related art provides a steel plate cutting technique including: controlling the cutting temperature to be 80 ℃, and cooling the cut material to room temperature in air; thus, after the cut steel sheet is left for a certain period of time, the edge of the steel sheet is cracked, resulting in low quality of the steel sheet.
The double-gun thermal state cutting method for reducing the edge cracks of the steel plate comprises the following steps of: the steel plate was cut by two torch cutters.
Wherein the former flame cutting machine is used for preheating the steel plate; firstly, the flame can be adjusted, mixed gas of oxygen and propane is adopted, the volume ratio of the oxygen to the propane is 5:2, the length of the flame is controlled to be 10 +/-2 cm, for example: 8cm, 8.5cm, 9cm, 10cm, 11cm, 12cm, etc.; controlling the length ratio of the red flame at the head part of the flame to the blue flame at the root part of the flame to be 8-9: 1, for example: 8:1 or 9:1, etc.; the cutting oxygen flow is controlled within 5 degrees behind the vertical cutting torch so that the surface temperature of the steel plate before cutting is more than or equal to 120 ℃.
Cutting the edge of the steel plate to length by using the latter flame cutting machine; wherein, the cutting can adopt 7 # cutting nozzles, and the interval between cutting nozzle and steel plate is 6-8mm, for example: 6mm, 7mm, 8mm, etc., and the cutting speed is 270-290mm/min, for example: 270mm/min, 275mm/min, 280mm/min, 285mm/min, 290mm/min, etc.
When the cutting speed is too high, regulating the spark bunch to deflect in the opposite direction, and regulating the spark bunch to be parallel to the cutting oxygen flow to determine the normal cutting speed, wherein the gas flow plays a role in purging the generated cutting slag in the cutting process; after cutting, the cutting width is set to 10-15mm, for example: 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, etc., with lengths ranging from 25-35mm, for example: 25mm, 27mm, 29mm, 30mm, 32mm, 35mm and the like, the cut edge part is smooth, the blasting phenomenon is avoided, the problem that the cut edge part of the steel plate is easy to crack can be effectively reduced, and the cutting quality of the steel plate is improved.
Further, the distance between the front flame cutting machine and the rear flame cutting machine is 20-30cm, and the heap cooling time after cutting is more than or equal to 36h and reaches the room temperature; the interval with two flame cutting machine adjusts the interval distance to the adaptation, can utilize preceding flame cutting machine to preheat the back to the steel sheet, utilize back flame cutting machine to cut the steel sheet that preheats in time, and then ensure that the steel sheet can keep at suitable temperature when being cut by back flame cutting machine, and then the phenomenon of blasting appears when being favorable to reducing the steel sheet cutting, reduce the crackle of steel sheet, improve the quality behind the steel sheet cutting, and can not discover the crackle when later stage uses.
In addition, the cutting method for reducing the edge cracks of the steel plate does not need the investment of extra process equipment, only needs to firstly adopt the flame cutting machine to control the flame, further controls the preheating of the steel plate, and controls the crack of the cut steel plate by controlling the distance between the cutting nozzle of the flame cutting machine and the steel plate and the cutting speed.
Example 1
And performing shot blasting on the steel plate, and treating the surface iron scale.
And (3) heat treatment: the thickness of the steel plate is 10mm, and the steel plate is quenched for 40min at the temperature of 910 ℃ and tempered.
And leveling the cutting table, and carrying out coping and polishing operation on the cutting track.
Double-gun thermal cutting:
preheating the steel plate by using a previous flame cutting machine; firstly, adjusting flame, wherein the volume ratio of oxygen to propane is 5:2, the length of the flame is controlled to be 10cm, the length ratio of red flame at the head of the flame to blue flame at the root of the flame is 9:1, and the cutting oxygen flow is controlled to be within 5 degrees relative to a vertical cutting torch so as to ensure that the surface temperature of a steel plate before cutting is 120 ℃.
The steel plate is cut to length by a rear flame cutting machine, and the distance between the rear flame cutting machine and the front flame cutting machine is 20 cm; the cutting nozzle is No. 7; the distance between the cutting nozzle and the steel plate is 6mm, and the cutting speed is 280 mm/min; when the cutting speed is too high, adjusting the spark bundles to deflect in the opposite direction, determining the normal cutting speed when the spark bundles are adjusted to be parallel to the cutting oxygen flow, and blowing the generated cutting slag by the air flow in the cutting process; after cutting, the cutting width is set to be 10mm, the cutting length is set to be 25mm, the quality of the cut edge is smooth, and the phenomenon of blasting is avoided.
Example 2
And performing shot blasting on the steel plate, and treating the surface iron scale.
And (3) heat treatment: the thickness of the steel plate is 20mm, quenching is carried out for 55min at the temperature of 920 ℃, and tempering is carried out.
And leveling the cutting table, and carrying out coping and polishing operation on the cutting track.
Double-gun thermal cutting:
preheating the steel plate by using a previous flame cutting machine; firstly, adjusting flame, wherein the volume ratio of oxygen to propane is 5:2, the length of the flame is controlled to be 12cm, the length ratio of red flame at the head of the flame to blue flame at the root of the flame is 8:1, and the cutting oxygen flow is controlled to be within 5 degrees relative to a vertical cutting torch so as to ensure that the surface temperature of a steel plate before cutting is 125 ℃.
The steel plate is cut to length by a rear flame cutting machine, and the distance between the rear flame cutting machine and the front flame cutting machine is 30 cm; the cutting nozzle is No. 7; the distance between the cutting nozzle and the steel plate is 8mm, and the cutting speed is 290 mm/min; when the cutting speed is too high, adjusting the spark bundles to deflect in the opposite direction, determining the normal cutting speed when the spark bundles are adjusted to be parallel to the cutting oxygen flow, and blowing the generated cutting slag by the air flow in the cutting process; after cutting, the cutting width is set at 15mm, the cutting length is set at 35mm, the quality of the cut edge is smooth, and the phenomenon of blasting is avoided.
Example 3
And performing shot blasting on the steel plate, and treating the surface iron scale.
And (3) heat treatment: the thickness of the steel plate is 50mm, and the steel plate is quenched for 105min and tempered at 900 ℃.
And leveling the cutting table, and carrying out coping and polishing operation on the cutting track.
Double-gun thermal cutting:
preheating the steel plate by using a previous flame cutting machine; firstly, adjusting flame, wherein the volume ratio of oxygen to propane is 5:2, the length of the flame is controlled to be 8cm, the length ratio of red flame at the head of the flame to blue flame at the root of the flame is 9:1, and the cutting oxygen flow is controlled to be within 5 degrees relative to a vertical cutting torch so as to ensure that the surface temperature of a steel plate before cutting is 122 ℃.
The steel plate is cut to length by a rear flame cutting machine, and the distance between the rear flame cutting machine and the front flame cutting machine is 25 cm; the cutting nozzle is No. 7; the distance between the cutting nozzle and the steel plate is 7mm, and the cutting speed is 270 mm/min; when the cutting speed is too high, adjusting the spark bundles to deflect in the opposite direction, determining the normal cutting speed when the spark bundles are adjusted to be parallel to the cutting oxygen flow, and blowing the generated cutting slag by the air flow in the cutting process; after cutting, the cutting width is set to be 12mm, the cutting length is set to be 30mm, the quality of the cut edge is smooth, and the phenomenon of blasting is avoided.
After cutting the steel sheets by the methods of examples 1 and 2, the crack condition of each steel sheet is shown in fig. 1 to 5; from the results of fig. 1 to 5, it can be seen that the amount of cracks can be effectively controlled by cutting the steel sheet by the cutting method of the present invention, thereby improving the cutting quality.
In conclusion, the cutting method for reducing the edge cracks of the steel plate can reduce the crack generation condition after the steel plate is cut, and improve the quality of the steel plate.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A cutting method for reducing cracks on the edge of a steel plate is characterized by comprising the following steps:
pre-treating;
heat treatment; and the number of the first and second groups,
dual-gun thermal cutting, comprising:
preheating the steel plate by using a previous flame cutting machine, wherein the length ratio of red flame at the head of the flame to blue flame at the root of the flame is 8-9: 1, so that the surface temperature of the steel plate before cutting is more than or equal to 120 ℃;
and cutting the edge part of the steel plate by using the latter flame cutting machine, wherein the distance between a cutting nozzle and the steel plate is 6-8mm, and the cutting speed is 270-290 mm/min.
2. The cutting method for reducing edge cracks of a steel plate according to claim 1, wherein the distance between the former torch cutter and the latter torch cutter is 20-30 cm; the heap cooling time after cutting is more than or equal to 36h to room temperature.
3. The cutting method for reducing edge cracks of a steel plate according to claim 1, wherein when the previous torch-cutting machine is used for preheating the steel plate, the method further comprises adjusting the flame, and using a mixed gas of oxygen and propane, wherein the volume ratio of the oxygen to the propane is 5: 2.
4. The cutting method for reducing edge cracks of a steel sheet according to claim 1, wherein the cutting oxygen flow is controlled within 5 ° from the vertical cutting torch when the steel sheet is preheated by the preceding torch cutting machine.
5. The cutting method for reducing the edge cracks of the steel plate according to claim 1, wherein the later torch cutting machine is used for cutting the edge of the steel plate, and the method further comprises the following specific steps: when the cutting speed is too high, adjusting the spark bundles to deflect in the opposite direction, determining the normal cutting speed when the spark bundles are adjusted to be parallel to the cutting oxygen flow, and blowing the generated cutting slag by the air flow in the cutting process; after cutting, the cutting width is set to be 10-15mm, and the cutting length is set to be 25-35 mm.
6. The cutting method for reducing edge cracks of a steel plate according to any one of claims 1 to 5, wherein the temperature of the heat treatment is 910 ± 10 ℃.
7. The cutting method for reducing the edge cracks of the steel plate according to claim 6, wherein the heat treatment step specifically comprises:
when the thickness of the steel plate is more than or equal to 10mm and less than 20mm, quenching for H +30 min;
quenching for 1.5 XH + (25-30) min when the thickness of the steel plate is greater than or equal to 20mm and less than or equal to 50 mm; wherein H is the thickness of the steel plate.
8. The cutting method for reducing the edge cracks of the steel plate according to claim 1, wherein the step of preprocessing specifically comprises the following steps: and performing shot blasting on the steel plate to treat the iron scale on the surface.
9. The cutting method for reducing edge cracks of a steel plate according to claim 1, further comprising: leveling the cutting bench prior to performing the step of dual-gun thermal state cutting.
10. The cutting method for reducing edge cracks of a steel plate according to claim 9, further comprising: and before the step of carrying out the double-gun thermal state cutting, grinding and polishing the cutting track.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210609409.8A CN114850618A (en) | 2022-05-31 | 2022-05-31 | Cutting method for reducing edge cracks of steel plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210609409.8A CN114850618A (en) | 2022-05-31 | 2022-05-31 | Cutting method for reducing edge cracks of steel plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114850618A true CN114850618A (en) | 2022-08-05 |
Family
ID=82641893
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210609409.8A Pending CN114850618A (en) | 2022-05-31 | 2022-05-31 | Cutting method for reducing edge cracks of steel plate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114850618A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1299756A (en) * | 1961-06-30 | 1962-07-27 | Union Carbide Corp | Method and apparatus for heat treatment of metal surfaces with a view in particular to their cutting |
| JP2010000511A (en) * | 2008-06-18 | 2010-01-07 | Universal Shipbuilding Corp | Gas cutting method and device for steel sheet |
| CN103170704A (en) * | 2013-03-16 | 2013-06-26 | 南阳汉冶特钢有限公司 | Flame cutting process of steel plate of extremely thick medium and high carbon steel and alloy steel |
| CN104107971A (en) * | 2014-06-17 | 2014-10-22 | 首钢总公司 | Flame cutting method for high-carbon-equivalent thick steel plate steel plate |
| CN105834548A (en) * | 2016-06-07 | 2016-08-10 | 南京钢铁股份有限公司 | Flame cutting technology for thick steel plates |
| CN108044221A (en) * | 2017-12-08 | 2018-05-18 | 高伟红 | A kind of gas flame cuttiug technique of middle, high-carbon steel plate |
-
2022
- 2022-05-31 CN CN202210609409.8A patent/CN114850618A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1299756A (en) * | 1961-06-30 | 1962-07-27 | Union Carbide Corp | Method and apparatus for heat treatment of metal surfaces with a view in particular to their cutting |
| JP2010000511A (en) * | 2008-06-18 | 2010-01-07 | Universal Shipbuilding Corp | Gas cutting method and device for steel sheet |
| CN103170704A (en) * | 2013-03-16 | 2013-06-26 | 南阳汉冶特钢有限公司 | Flame cutting process of steel plate of extremely thick medium and high carbon steel and alloy steel |
| CN104107971A (en) * | 2014-06-17 | 2014-10-22 | 首钢总公司 | Flame cutting method for high-carbon-equivalent thick steel plate steel plate |
| CN105834548A (en) * | 2016-06-07 | 2016-08-10 | 南京钢铁股份有限公司 | Flame cutting technology for thick steel plates |
| CN108044221A (en) * | 2017-12-08 | 2018-05-18 | 高伟红 | A kind of gas flame cuttiug technique of middle, high-carbon steel plate |
Non-Patent Citations (1)
| Title |
|---|
| 聂厚章，: "《焊接技术手册》", 山西科学技术出版社, pages: 272 - 273 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102676752B (en) | Thermal treatment process for die steel H13 of automobile forged piece | |
| CN101608252A (en) | The 2Cr13 thermal treatment process | |
| CN106736326A (en) | Automobile die method for surface hardening | |
| KR20190041729A (en) | Hardfacing method of press die | |
| CN101353772A (en) | Heat treatment process improving two-phase titanium alloy damage tolerance property | |
| CN110656294A (en) | Working roll special for tin-plating finisher and manufacturing method thereof | |
| CN102264512A (en) | Method for manufacturing blasting material for shot-peening | |
| CN113684421B (en) | Production method of steel for ultra-wide disk saw blade of mine | |
| CN114850618A (en) | Cutting method for reducing edge cracks of steel plate | |
| CN110804723A (en) | Heat treatment method for saw blade production | |
| RU2753636C1 (en) | Method for obtaining wear-resistant coating | |
| CN114427091B (en) | High-wear-resistance die steel product for hot stamping and additive manufacturing process thereof | |
| CN104128777A (en) | Turning tool machining technology capable of reducing heat damage and improving tempering quality | |
| CN112008206B (en) | Welding method for quenched and tempered high-strength steel plate | |
| CN110699517B (en) | Vacuum high-temperature quenching heat treatment process for DC53 steel | |
| CN110512064B (en) | Method for preparing laminated material with grain gradient by applying induction normalizing | |
| CN113172089A (en) | Production method of high-carbon martensitic stainless steel steckel mill | |
| CN218093396U (en) | Novel antifriction plate for sludge pump | |
| KR970005418B1 (en) | Method of plasma ion-nitriding treatment | |
| CN115449694B (en) | Cutter of shield machine and production method thereof | |
| CN110539134B (en) | Production process of high-magnetism steel composite blank | |
| CN104325061A (en) | Nickel-based alloy anvil for forging square and flat steels | |
| CN108823387A (en) | A kind of new-energy automobile torsion bar suspension heat treatment method | |
| CN117051333B (en) | Forged steel supporting roller and preparation method thereof | |
| CN108788659A (en) | A kind of manufacturing method of high-precision slitting cutting disc |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |