CN108714623A - A kind of process for solving the problems, such as large gauge ribbed bar clod wash and splitting - Google Patents
A kind of process for solving the problems, such as large gauge ribbed bar clod wash and splitting Download PDFInfo
- Publication number
- CN108714623A CN108714623A CN201810457413.0A CN201810457413A CN108714623A CN 108714623 A CN108714623 A CN 108714623A CN 201810457413 A CN201810457413 A CN 201810457413A CN 108714623 A CN108714623 A CN 108714623A
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- China
- Prior art keywords
- water
- cooling
- cross rib
- solving
- clod wash
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- 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.)
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
- B21B1/163—Rolling or cold-forming of concrete reinforcement bars or wire ; Rolls therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
-
- 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
- B21B45/02—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 lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B45/0224—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for wire, rods, rounds, bars
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Abstract
The present invention relates to steel rolling field more particularly to a kind of processes for solving the problems, such as large gauge ribbed bar clod wash and splitting comprising following steps：The first step reduces cross rib bevel angle α, cross rib bevel angle α is improved to 55 ° by original 60 °；Second step reduces the angle β of cross rib and axis, β is improved to 50 ° by original 67 °；Third walks, and carries out reconditioning to the root of groove, improves the circular arc degree of groove root transition portion；4th step is improved cooling technique, is transformed to former Water cooling device, transforming original polycyclic cooling as three-stage wears water pipe Quick-gasifying cooling system；5th step is increased reverse compression air nozzle in the front end for wearing water pipe, the water and other attachments of steel surface after water is worn with cleaning.Process provided by the invention can solve the problems, such as that large gauge ribbed bar clod wash is split.
Description
Technical field
The present invention relates to steel rolling field more particularly to a kind of processes for solving the problems, such as large gauge ribbed bar clod wash and splitting.
Background technology
Big specification spiral often will appear fine crack, cause during building site uses especially in clod wash
User throws doubt upon to steel bar quality, to influence the sales volume of reinforcing bar.
Invention content
Technical problem to be solved by the invention is to provide a kind of processes for solving the problems, such as large gauge ribbed bar clod wash and splitting.
The present invention is to be achieved by the following technical programs：
A kind of process for solving the problems, such as large gauge ribbed bar clod wash and splitting comprising following steps：
The first step reduces cross rib bevel angle α, cross rib bevel angle α is improved to 55 ° by original 60 °；
Second step reduces the angle β of cross rib and axis, β is improved to 50 ° by original 67 °；
Third walks, and carries out reconditioning to the root of groove, improves the circular arc degree of groove root transition portion；
4th step improves cooling technique, is transformed to former Water cooling device, transform original polycyclic cooling as three
Segmentation wears water pipe Quick-gasifying cooling system；
5th step increases reverse compression air nozzle in the front end for wearing water pipe, with clean wear after water the water of steel surface and
Other attachments.
Further, the water pipe of wearing for wearing water pipe Quick-gasifying cooling system is discharged equipped with Water cooling water inlet, Water cooling
Mouth and the Water cooling air inlet being opened in front of Water cooling water inlet, the Water cooling air inlet, which is passed through high pressure gas, to be made
Wear the cooling water vapor in water pipe.
Further, reverse compression air nozzle circumferential direction is equipped with multiple water spray channels.
Further, water spray channel and the angle of reverse compression air nozzle center line are 45 °.
Beneficial effects of the present invention
By using a kind of process for solving the problems, such as large gauge ribbed bar clod wash and splitting that the present invention is protected, keep screw thread horizontal
Cold Bending Crack greatly reduces at rib, and average elongation obtains a degree of raising, such as:<25 spiral index A are (disconnected
Elongation afterwards) improve nearly 2%.
The method for specifically changing screw thread cross rib α, β angle by taking, effectively improves spiral cross rib root
Stress state, the cracked situation of finished product cold bending test process are effectively controlled, and product quality significantly improves；
And in Roller Machining, reconditioning is carried out to the root of groove by making tooling, it is excessive to improve groove root
Partial circular arc degree improves reinforcing bar during the rolling process so as to reduce groove in the rolling resistance of the transverse bar of the operation of rolling
Root Stress concentration problem；
In addition cooling technique is improved, former Water cooling device is transformed, transform original polycyclic cooling as three sections
Formula wears the cooling of water pipe Quick-gasifying, and the cooling of reinforcing bar can be made more uniformly without dead angle, further prevent steel in cooling procedure
Middle reinforcing bar root inhomogeneous cooling and cause stress concentration；Increase reverse compression air nozzle in the front end for wearing water pipe, it can be with
The water and other attachments for cleaning steel surface after wearing water, are further ensured that the quality of steel.
Description of the drawings
Fig. 1, Fig. 2 are cross rib bevel angle α force analysis schematic diagram；
Fig. 3 is cross rib bevel angle α structural schematic diagram；
Fig. 4 is the angle beta structure schematic diagram of cross rib and axis；
Fig. 5 is to wear water pipe Quick-gasifying schematic diagram of cooling system structure；
Fig. 6 is reverse compression air nozzle structural schematic diagram；
1. Water cooling water outlet in figure, 2. wear water pipe, and 3. Water cooling water inlets, 4. Water cooling air inlets, 5. is anti-
To compressed-air atomizer, 6. water spray channels.
Specific implementation mode
A kind of process for solving the problems, such as large gauge ribbed bar clod wash and splitting comprising following steps：
The first step reduces cross rib bevel angle α, cross rib bevel angle α is improved to 55 ° by original 60 °；
Second step reduces the angle β of cross rib and axis, β is improved to 50 ° by original 67 °；
Third walks, and carries out reconditioning to the root of groove, improves the circular arc degree of groove root transition portion；
4th step improves cooling technique, is transformed to former Water cooling device, transform original polycyclic cooling as three
Segmentation wears water pipe Quick-gasifying cooling system；
5th step increases reverse compression air nozzle in the front end for wearing water pipe, with clean wear after water the water of steel surface and
Other attachments.
Further, the water pipe 2 of wearing for wearing water pipe Quick-gasifying cooling system goes out equipped with Water cooling water inlet 3, Water cooling
The mouth of a river 1 and the Water cooling air inlet 4 being opened in front of Water cooling water inlet, the Water cooling air inlet are passed through high pressure gas
Body makes to wear the cooling water vapor in water pipe.
Further, reverse compression air nozzle 5 is circumferential is equipped with multiple water spray channels 6.
Further, water spray channel and the angle of reverse compression air nozzle center line are 45 °.
Since its cross rib of Rib Reinforced reinforcement and inside diameter surface intersection are without knuckle, in the operation of rolling, cross rib side by
To the effect of normal roll pressure N and frictional force f, make to generate bending stress σ f, compression stress ot x between cross rib root and basic circle surface
With shear stress τ, such as Fig. 1, shown in Fig. 2, wherein σ f play a major role,
σ f=M/W=(N sin α+Nmcos α) L/W
In formula, M is bending moment；W is bending sections modulus；α is cross rib oblique angle (as shown in Figure 3)；L is acting force arm；m
For friction factor.
Reinforcing bar is in Cold Bending, the effect of torque M by bending, generates bending stress and is added on σ f, makes reinforcing bar by curved
The outer surface pulling force of pars convoluta position greatly increases, the presence of this tensile stress so that plasticity, the toughness of cross rib root are much smaller than remaining
Partial plasticity, toughness, Resisting fractre ability are greatly lowered.Therefore using cross rib bevel angle α is reduced, make cross rib bevel angle α by original
60 ° be improved to 55 °, so that it had both been met the pertinent regulations of relevant criterion, (GB 1499-2007 provides, cross rib side and reinforcing bar
The angle α on surface cannot be less than 45 °), and the outer surface pulling force at reinforcing bar position by bending can be made to subtract with the reduction at the angles α
Small, shear stress τ also reduces, and stress concentration is made to be mitigated, to improve the Resisting fractre ability of reinforcing bar.
The angle of cross rib and axis is β, as shown in figure 4, by previous 67 ° be improved to 50 ° (GB1499-2007 provide,
Cross rib and reinforcing bar axis angle β are no less than 45 °, meet the requirements of the standard), it is advancing slip to cross due to rolled piece with the reduction at the angles β
Scratch is significantly mitigated caused by rib, can be effectively prevented the generation in initial crack source.
And in Roller Machining, reconditioning is carried out to the root of groove by making tooling, it is excessive to improve groove root
Partial circular arc degree improves reinforcing bar during the rolling process so as to reduce groove in the rolling resistance of the transverse bar of the operation of rolling
Root Stress concentration problem；
In addition cooling technique is improved, former Water cooling device is transformed, transform original polycyclic cooling as three sections
Formula wears the cooling of water pipe Quick-gasifying, and the cooling of reinforcing bar can be made more uniformly without dead angle, further prevent steel in cooling procedure
Middle reinforcing bar root inhomogeneous cooling and cause stress concentration；Increase reverse compression air nozzle in the front end for wearing water pipe, it can be with
The water and other attachments for cleaning steel surface after wearing water, are further ensured that the quality of steel.
By taking Φ 25,28 reinforcing bars of Φ as an example, specific test data is as follows：
Φ 25, the bend test of Φ 28 and reverse bending test
Tests prove that after by using process provided by the invention, the antiflex cracking ability of reinforcing bar significantly improves.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, any made by repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (4)
1. a kind of process for solving the problems, such as large gauge ribbed bar clod wash and splitting, which is characterized in that include the following steps：
The first step reduces cross rib bevel angle α, cross rib bevel angle α is improved to 55 ° by original 60 °；
Second step reduces the angle β of cross rib and axis, β is improved to 50 ° by original 67 °；
Third walks, and carries out reconditioning to the root of groove, improves the circular arc degree of groove root transition portion；
4th step improves cooling technique, is transformed to former Water cooling device, transform original polycyclic cooling as three-stage
Wear water pipe Quick-gasifying cooling system；
5th step increases reverse compression air nozzle in the front end for wearing water pipe, with clean wear after water the water of steel surface and other
Attachment.
2. a kind of process for solving the problems, such as large gauge ribbed bar clod wash and splitting according to claim 1, which is characterized in that wear
The water pipe of wearing of water pipe Quick-gasifying cooling system is equipped with Water cooling water inlet, Water cooling water outlet and is opened in Water cooling
Water cooling air inlet in front of water inlet, the Water cooling air inlet, which is passed through high pressure gas, makes to wear cooling steam in water pipe
Change.
3. a kind of process for solving the problems, such as large gauge ribbed bar clod wash and splitting according to claim 1 or 2, feature exist
In the reverse compression air nozzle circumferential direction is equipped with multiple water spray channels.
4. a kind of process for solving the problems, such as large gauge ribbed bar clod wash and splitting according to claim 3, which is characterized in that spray
The angle of aquaporin and reverse compression air nozzle center line is 45 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810457413.0A CN108714623A (en) | 2018-05-14 | 2018-05-14 | A kind of process for solving the problems, such as large gauge ribbed bar clod wash and splitting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810457413.0A CN108714623A (en) | 2018-05-14 | 2018-05-14 | A kind of process for solving the problems, such as large gauge ribbed bar clod wash and splitting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108714623A true CN108714623A (en) | 2018-10-30 |
Family
ID=63899908
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810457413.0A Pending CN108714623A (en) | 2018-05-14 | 2018-05-14 | A kind of process for solving the problems, such as large gauge ribbed bar clod wash and splitting |
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| Country | Link |
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| CN (1) | CN108714623A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111191338A (en) * | 2019-11-21 | 2020-05-22 | 张家港宏昌钢板有限公司 | Method for preventing transverse rib in equal-rib-height steel bar from cracking due to stress concentration |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5262120A (en) * | 1975-11-19 | 1977-05-23 | Nippon Steel Corp | Process for producing steel wire of high tensile strength |
| CN201783521U (en) * | 2010-08-30 | 2011-04-06 | 日照钢铁控股集团有限公司 | Novel intensive pressure water cooling device |
| CN102168473A (en) * | 2011-01-30 | 2011-08-31 | 莱芜钢铁股份有限公司 | Large-specification ribbed reinforcing steel bars and machining process thereof |
| CN103551404A (en) * | 2013-11-07 | 2014-02-05 | 山西太钢不锈钢股份有限公司 | Production method of stainless deformed bar |
-
2018
- 2018-05-14 CN CN201810457413.0A patent/CN108714623A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5262120A (en) * | 1975-11-19 | 1977-05-23 | Nippon Steel Corp | Process for producing steel wire of high tensile strength |
| CN201783521U (en) * | 2010-08-30 | 2011-04-06 | 日照钢铁控股集团有限公司 | Novel intensive pressure water cooling device |
| CN102168473A (en) * | 2011-01-30 | 2011-08-31 | 莱芜钢铁股份有限公司 | Large-specification ribbed reinforcing steel bars and machining process thereof |
| CN103551404A (en) * | 2013-11-07 | 2014-02-05 | 山西太钢不锈钢股份有限公司 | Production method of stainless deformed bar |
Non-Patent Citations (1)
| Title |
|---|
| 赵根社等: ""通过孔型改进解决大规格钢筋冷弯裂纹问题"", 《现代冶金》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111191338A (en) * | 2019-11-21 | 2020-05-22 | 张家港宏昌钢板有限公司 | Method for preventing transverse rib in equal-rib-height steel bar from cracking due to stress concentration |
| CN111191338B (en) * | 2019-11-21 | 2023-08-22 | 张家港宏昌钢板有限公司 | Method for avoiding cracking of transverse ribs in equal-rib-height steel bars due to stress concentration |
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| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
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| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20181030 |