CN211915643U - Device for preventing shear stress crack of special steel bar - Google Patents
Device for preventing shear stress crack of special steel bar Download PDFInfo
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- CN211915643U CN211915643U CN202020372509.XU CN202020372509U CN211915643U CN 211915643 U CN211915643 U CN 211915643U CN 202020372509 U CN202020372509 U CN 202020372509U CN 211915643 U CN211915643 U CN 211915643U
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- shear blade
- shearing
- special steel
- shear
- acetylene
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 32
- 239000010959 steel Substances 0.000 title claims abstract description 32
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 29
- 239000001301 oxygen Substances 0.000 claims abstract description 29
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 claims abstract description 28
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 claims abstract description 28
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 26
- 208000037656 Respiratory Sounds Diseases 0.000 claims abstract description 3
- 238000005520 cutting process Methods 0.000 claims description 8
- 238000005336 cracking Methods 0.000 claims description 4
- 238000010008 shearing Methods 0.000 abstract description 58
- 238000000034 method Methods 0.000 abstract description 16
- 230000008034 disappearance Effects 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 11
- 238000010438 heat treatment Methods 0.000 description 8
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910000677 High-carbon steel Inorganic materials 0.000 description 1
- 238000010285 flame spraying Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
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Abstract
The utility model relates to a prevent device of special steel bar shear stress crackle, including cold shears, cold shears includes shear blade device and lower shear blade device, go up shear blade device with be provided with a plurality of rods down between the shear blade device, it installs the flame projecting device on the shear blade device to go up, the flame projecting device lower part is provided with a plurality of alignments the nozzle of rod, flame projecting device inside be provided with the air cavity of nozzle intercommunication, the air cavity is connected with oxygen conveyer pipe and acetylene conveying pipe, oxygen conveyer pipe with be provided with oxygen air control valve and acetylene control valve on the acetylene conveying pipe respectively. The utility model discloses can improve the temperature of special steel bar cold shear section, reduce the stress of section shearing, guarantee that rod shear stress is far less than the intensity of rod, ensure special steel bar at shearing in-process disappearance stress crack.
Description
Technical Field
The utility model relates to a special steel bar production technical field specifically is a prevent special steel bar shear stress crack's device.
Background
At present, most of special steel bar production lines are designed with on-line sizing cold shears. As is known, cold shearing produces a certain shearing stress, once the shearing stress exceeds the limit of the material at a certain temperature, the material can produce stress cracks in the shearing process, and the metal material has huge shearing stress at normal temperature or below 200 ℃, especially high-carbon and high-alloy steel. In general, in order to improve the production efficiency, bars with the specifications of less than 60mm of low-carbon and low-alloy special steel are cut to length by using an online cold shearing machine, particularly bars with small specifications are cut to length by using the online cold shearing machine, the production efficiency of a production line can be exerted to the maximum extent, the production cost is low, and the requirements of most of current low-carbon and low-alloy high-quality special steel production lines can be basically met.
However, the high-carbon and high-alloy special steel small bar has a small specification, so that after the bar is put on a cooling bed, the cooling speed is high, the temperature of the bar is already reduced to below 200 ℃ from the lower cooling bed to a cold shear part, and the temperature difference is large between different bars. If an on-line cold shearing machine is adopted for shearing to length, shear stress cracks can occur, severe shearing can be performed to crack, and stress cracks with different degrees can occur to a shearing section along with the release of stress in the stacking process after shearing under a general condition, so that the quality problem of large-batch shearing is caused.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is: the problem of stress crack of a shear section is solved.
In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a pair of prevent device of special steel bar shear stress crackle, including cold shears, cold shears includes shear blade device and lower shear blade device, go up shear blade device with be provided with a plurality of rods down between the shear blade device, upward install the flame projecting device on the shear blade device, the flame projecting device lower part is provided with a plurality of alignments the nozzle of rod, flame projecting device inside be provided with the air cavity of nozzle intercommunication, the air cavity is connected with oxygen conveyer pipe and acetylene conveying pipe, the oxygen conveyer pipe with be provided with oxygen air control valve and acetylene control valve on the acetylene conveying pipe respectively. The plurality of flames of the nozzles are utilized to instantaneously heat the shearing position of the bar at a fixed point, so that the shearing stress of the shearing end face of the special steel bar is reduced, and the bar is prevented from generating stress cracks in the shearing process and the stacking process.
Further, the upper shear blade device comprises an upper shear blade for shearing the bar, the nozzle is arranged on the lower portion of the flaming device along the length direction of the upper shear blade, the length direction of the upper shear blade can be covered, and finally each bar can be effectively heated in the shearing process, and the nozzle is higher than the upper shear blade.
Further, the oxygen conveyer pipe with be provided with oxygen flow valve and acetylene flow valve on the acetylene conveyer pipe respectively, through the flow of controlling acetylene and oxygen respectively, it is right to realize the fixed point heating of terminal surface is cuted to the rod, also conveniently adjusts simultaneously the required target temperature of terminal surface is cuted to the rod.
Further, the use method of the device for preventing the shear stress cracks of the special steel bar comprises the following steps:
s1, placing the bar on a shearing roller way between the upper shearing edge device and the lower shearing edge device;
s2, opening the acetylene control valve and the acetylene flow valve while starting the shearing roller way, and adjusting the flow value of the acetylene flow valve to be 5% -10% so as to ensure that the nozzle has long open fire;
s3, when the part to be sheared of the bar moves to the position right below the upper shearing edge, shutting down the shearing roller way;
s4, opening the oxygen control valve and the oxygen flow valve, adjusting the flow value of the oxygen flow valve and the flow value of the acetylene flow valve to be 50% -100%, heating the shear surface of the bar by flame sprayed by the nozzle for 5-10 seconds, wherein the heating time is the time from the roller way stopping to the shearing clearance;
and S5, enabling the shearing part to reach a certain temperature, and then starting the cold shearing machine to shear the bar (5).
The utility model has the advantages that: the device for preventing the shear stress cracks of the special steel bar can improve the temperature of the cold-shearing section of the special steel bar, reduce the stress of section shearing, ensure that the shear stress of the bar is far lower than the strength of the bar, and ensure that the special steel bar does not have the stress cracks in the shearing process; the production efficiency is improved, the shearing quality of the special steel small bars in China can be greatly improved, the economic benefit is remarkable, and the method has great market popularization and application values on the existing special steel small bar production line.
Drawings
The present invention will be further explained with reference to the drawings and examples.
Fig. 1 is a front view of the present invention;
figure 2 is a front view of the upper cutting edge device of the present invention;
FIG. 3 is a flow chart of the method of using the device for preventing shear stress cracking of special steel bars according to the present invention;
in the figure: 1-upper shear blade device, 2-flame spraying device, 3-nozzle, 4-lower shear blade device, 5-bar, 6-air cavity, 7-acetylene flow valve, 8-oxygen flow valve, 9-acetylene control valve, 10-oxygen control valve, 11-oxygen conveying pipe, 12-acetylene conveying pipe and 13-upper shear blade.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic drawings and illustrate the basic structure of the present invention only in a schematic manner, and thus show only the components related to the present invention.
As shown in fig. 1, the utility model provides a pair of prevent device of special steel bar shear stress crack, including cold shears, cold shears includes shear blade device 1 and lower shear blade device 4, go up shear blade device 1 with be provided with a plurality of rods 5 down between shear blade device 4, it installs flaming device 2 on the shear blade device 1 to go up, flaming device 2 lower part is provided with a plurality of alignments nozzle 3 of rod 5, flaming device 2 inside be provided with air cavity 6 of nozzle 3 intercommunication, air cavity 6 is connected with oxygen conveyer pipe 11 and acetylene conveying pipe 12, oxygen conveyer pipe 11 with be provided with oxygen control valve 10 and acetylene control valve 9 on the acetylene conveying pipe 12 respectively.
And (3) performing fixed-point instantaneous heating on the shearing part of the bar 5 by using flames of the plurality of nozzles 3 to ensure that the temperature of the shearing section reaches 500-700 ℃, so that the plasticity of the shearing section is improved, the shearing stress of the shearing end face of the special steel bar is reduced, the shearing stress generated by shearing is far lower than the strength of the material, and the special steel bar is ensured not to have stress cracks in the shearing process and the stacking process.
As shown in fig. 1 and 2, the upper cutting edge device 1 includes an upper cutting edge 13 for cutting the rod 5, the nozzle 3 is disposed at a lower portion of the flaming device 2 along a length direction of the upper cutting edge 13, so as to ensure that the upper cutting edge 13 can cover the length direction, and finally ensure that each rod 5 can be effectively heated in the shearing process, the portion of the nozzle 3 higher than the upper cutting edge 13 is a height of flame sprayed from the nozzle 3, and the flame sprayed from the nozzle 3 is directed at a shearing end face portion of the rod 5.
As shown in fig. 1, the oxygen delivery pipe 11 and the acetylene delivery pipe 12 are respectively provided with an oxygen flow valve 8 and an acetylene flow valve 7, and the fixed-point heating of the shearing end face of the bar 5 is realized by respectively controlling the flow of acetylene and oxygen, and the target temperature required by the shearing end face of the bar 5 is also conveniently adjusted. The heating target temperature of the shearing end face can be set according to the performance of each special steel type so as to avoid the blue and brittle temperature range (300-.
As shown in fig. 3, a method for using the device for preventing shear stress cracking of the special steel bar comprises the following steps:
s1, placing the bar 5 on a shearing roller way between the upper shear blade device 1 and the lower shear blade device 4;
s2, opening the acetylene control valve 9 and the acetylene flow valve 7 while starting the shearing roller way, and adjusting the flow value of the acetylene flow valve 7 to be 5% -10% so as to ensure that the nozzle 3 is open fire for a long time;
s3, when the part to be sheared of the bar 5 moves to the position right below the upper shearing edge 13, shutting down the shearing roller way;
s4, opening the oxygen control valve 10 and the oxygen flow valve 8, adjusting the flow value of the oxygen flow valve 8 and the flow value of the acetylene flow valve 7 to 50% -100%, heating the shear surface of the bar 5 by flame sprayed by the nozzle 3 for 5-10 seconds, wherein the heating time is the time from the roller way stop to the shearing clearance;
and S5, enabling the shearing part to reach a certain temperature, and then starting the cold shearing machine to shear the bar (5).
The device for preventing the shear stress cracks of the special steel bar can improve the temperature of the cold-shearing section of the special steel bar, reduce the stress of section shearing, ensure that the shear stress of the bar is far lower than the strength of the bar, and ensure that the special steel bar does not have the stress cracks in the shearing process; the production efficiency is improved, the shearing quality of the special steel small bars in China can be greatly improved, the economic benefit is remarkable, and the method has great market popularization and application values on the existing special steel small bar production line.
In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (3)
1. The utility model provides a prevent device of special steel bar shear stress crackle which characterized in that: including cold shears, cold shears includes shear blade device (1) and lower shear blade device (4), go up shear blade device (1) with be provided with a plurality of rods (5) down between shear blade device (4), it installs flaming device (2) on shear blade device (1) to go up, flaming device (2) lower part is provided with a plurality of alignments nozzle (3) of rod (5), flaming device (2) inside be provided with air cavity (6) of nozzle (3) intercommunication, air cavity (6) are connected with oxygen conveyer pipe (11) and acetylene conveying pipe (12), oxygen conveyer pipe (11) with be provided with oxygen air control valve (10) and acetylene control valve (9) on acetylene conveying pipe (12) respectively.
2. The device for preventing shear stress cracking of special steel bars according to claim 1, characterized in that: go up shear blade device (1) including being used for cutting go up shear blade (13) of rod (5), nozzle (3) are followed go up shear blade (13) length direction sets up flaming device (2) lower part, nozzle (3) are higher than go up shear blade (13).
3. The device for preventing shear stress cracking of special steel bars according to claim 1, characterized in that: the oxygen conveying pipe (11) and the acetylene conveying pipe (12) are respectively provided with an oxygen flow valve (8) and an acetylene flow valve (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020372509.XU CN211915643U (en) | 2020-03-20 | 2020-03-20 | Device for preventing shear stress crack of special steel bar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020372509.XU CN211915643U (en) | 2020-03-20 | 2020-03-20 | Device for preventing shear stress crack of special steel bar |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211915643U true CN211915643U (en) | 2020-11-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020372509.XU Active CN211915643U (en) | 2020-03-20 | 2020-03-20 | Device for preventing shear stress crack of special steel bar |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111299678A (en) * | 2020-03-20 | 2020-06-19 | 中天钢铁集团有限公司 | Device for preventing shear stress cracks of special steel bar and using method thereof |
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2020
- 2020-03-20 CN CN202020372509.XU patent/CN211915643U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111299678A (en) * | 2020-03-20 | 2020-06-19 | 中天钢铁集团有限公司 | Device for preventing shear stress cracks of special steel bar and using method thereof |
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