CN110964894A - Preparation process of external thread steel pipe for anchor rod - Google Patents
Preparation process of external thread steel pipe for anchor rod Download PDFInfo
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- CN110964894A CN110964894A CN201911355370.6A CN201911355370A CN110964894A CN 110964894 A CN110964894 A CN 110964894A CN 201911355370 A CN201911355370 A CN 201911355370A CN 110964894 A CN110964894 A CN 110964894A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
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Abstract
The invention discloses a preparation process of an external thread steel pipe for an anchor rod, which comprises the following steps: step one, a round pipe blank is made into a round workpiece through hot piercing and reducing diameter and wall continuous rolling; step two, heating the workpiece to the temperature required by the process, then putting the workpiece into a heat-preservation electric furnace for heat preservation and homogenization, and then, putting the workpiece into a processing station of the external thread three-roller hot rolling forming device for rolling; and step three, quenching, cooling and dewatering the rolled workpiece, and then tempering and tempering to obtain a finished product, wherein in the step two and the step three, the roller set is used for driving the workpiece to advance to finish the feeding action, and the rollers in the roller set form an included angle of 30-60 degrees with the advancing direction of the workpiece in the tempering step. Through the mode, the forming quality of the external thread steel pipe for the anchor rod can be obviously improved, meanwhile, the workpiece is effectively prevented from bending and deforming under the action of gravity, the finishing and straightening process in the traditional production is omitted, and the investment of a production line is reduced.
Description
Technical Field
The invention relates to the field of production of special-shaped steel pipes, in particular to a preparation process of an external thread steel pipe for an anchor rod.
Background
The anchor rod as a common production process of the external thread steel pipe generally comprises the steps of pipe blank manufacturing, external thread forming, tempering, finishing and straightening to obtain a satisfactory product, the whole production process is long in flow, the related equipment types are more, and the investment amount is larger. In addition, in the actual production, the steel pipe is rapidly heated by the high-frequency inductor in the step of forming the external thread, and then the external thread is rolled by the three-roller forming device, so that the rolling of the external thread is unqualified sometimes, and the anchor rod cannot meet the friction requirement when the anchor rod is required to be anchored in use.
Disclosure of Invention
The invention mainly solves the technical problem of providing a preparation process of an external thread steel pipe for an anchor rod, which can improve the production efficiency and the product quality of the anchor rod.
In order to solve the technical problems, the invention adopts a technical scheme that: the preparation process of the external thread steel pipe for the anchor rod comprises the following steps:
firstly, a round pipe blank is made into a round workpiece through hot piercing and reducing diameter and wall continuous rolling;
step two, molding, namely transferring the workpiece obtained in the step one to an external thread molding production line, heating the workpiece to a process required temperature through a molding superaudio induction heating coil, then putting the workpiece into a heat-preservation electric furnace for heat preservation and homogenization, and after the heat preservation and homogenization, putting the workpiece into a processing station of an external thread three-roll hot rolling molding device to obtain a workpiece with an external surface rolled with a regular external thread;
and step three, tempering, namely heating the workpiece obtained in the step two to a critical quenching temperature by using a superaudio induction heating coil, then rapidly cooling by using cooling water, removing water stains inside and outside the workpiece from the cooled workpiece by using a water removal device, tempering and tempering by using a high-frequency induction coil for tempering, and cooling to the normal temperature after tempering.
In the second step and the third step, the roller set is used in each process to drive the workpiece to advance to finish the feeding action, wherein the included angle of 30-60 degrees is formed between the rollers in the roller set used in the third step and the advancing direction of the workpiece.
In a preferred embodiment of the invention, the distance between any two adjacent rollers in the roller set does not exceed 1/3 the length of the workpiece.
In a preferred embodiment of the invention, the heat preservation homogenization time of the heat preservation electric furnace is not less than 3 min.
In a preferred embodiment of the present invention, the temperature of the workpiece of the ultrasonic induction heating coil for forming in the second step is 820 ℃ to 840 ℃.
In a preferred embodiment of the invention, the quenching temperature in the third step is 850 ± 5 °.
In a preferred embodiment of the invention, the cooling manner of the water-cooling quenching in the third step is to arrange an annular water-cooling ring in the advancing direction of the workpiece, and the water-cooling ring sprays cooling water to the outer surface of the workpiece.
In a preferred embodiment of the present invention, an angle between a spraying direction of the cooling water in the water cooling ring and the workpiece is 45 ° to 75 °.
In a preferred embodiment of the present invention, the temperature of the cooling water is 25 ° -30 °.
In a preferred embodiment of the present invention, the water removing device in the third step is a high pressure air jacket.
In a preferred embodiment of the present invention, the tempering temperature in the third step is 350 ° -360 °.
The invention has the beneficial effects that: the invention adopts the technical scheme that the production of the external thread steel pipe for the anchor rod is finished by adopting a flow line mode, compared with the production of the conventional external thread special-shaped steel pipe, the production of the external thread steel pipe for the anchor rod has the main two differences, namely, an electric furnace heat preservation process is added in the forming step before forming after heating, the uniform stability of steel pipe heating is improved, the internal and external temperature difference of the steel pipe after heat preservation is actually measured to be within +/-2, the forming quality of the external thread is obviously improved, the second difference is that the feeding mode in the hardening and tempering stage after the forming of the external thread steel pipe for the anchor rod is that an inclined roller is used for driving feeding, the inclined roller can drive the external thread steel pipe for the anchor rod to longitudinally and linearly advance on one hand and also has a transverse driving force when rotating, the movement mode can ensure uniform heating and cooling when quenching and, the ideal metallographic structure is obtained, the workpiece is effectively prevented from bending and deforming under the action of gravity, the finishing and straightening process in the traditional production is omitted, and the investment of a production line is reduced.
Drawings
FIG. 1 is a schematic view of a molding line layout according to a preferred embodiment of the present invention;
FIG. 2 is a schematic view of a tempering line arrangement according to a preferred embodiment of the present invention;
FIG. 3 is a schematic diagram of the roller conveying principle in the tempering line;
the parts in the drawings are numbered as follows:
1. the steel pipe comprises a round steel pipe, 2 parts of an external thread steel pipe, 3 parts of a superaudio induction heating coil for forming, 4 parts of a superaudio induction heating coil for quenching, 5 parts of a tempering high-frequency heating coil, 6 parts of a heat preservation electric furnace, 7 parts of a three-roller hot rolling forming device, 8 parts of a water cooling coil, 9 parts of a high-pressure air sleeve, 10 parts of an oblique roller.
Detailed Description
The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the invention.
Referring to fig. 1, fig. 2 and fig. 3, an embodiment of the present invention includes:
a preparation process of an external thread steel pipe for an anchor rod comprises the following steps:
firstly, a round pipe blank is made into a round steel pipe 1 through hot piercing and reducing diameter and wall continuous rolling;
step two, the round steel tube 1 obtained in the step one is transferred to an external thread forming production line for forming, the round steel tube 1 is heated to the temperature required by the process through a forming superaudio induction heating coil 3 and then enters a heat preservation electric furnace 6 for heat preservation and homogenization, the round steel tube 1 enters a processing station of an external thread hot rolling forming device 7 after the heat preservation and homogenization to obtain an external thread steel tube 2, the heat preservation process of the heat preservation electric furnace 6 can improve the uniformity and stability of the heating of the steel tube, the internal and external temperature difference of the steel tube after heat preservation is actually measured within +/-2, and the forming quality of the external thread is obviously improved compared with the heat preservation of the steel tube which is not heated by the electric;
and step three, tempering, namely heating the external thread steel pipe 2 obtained in the step two to a critical quenching temperature through a supersonic frequency induction heating coil 4 for quenching, then rapidly cooling the external thread steel pipe by using cooling water with the temperature of 25-30 ℃, removing water stains inside and outside the workpiece through a water removal device for the cooled external thread steel pipe 2, tempering and tempering at a medium temperature through a high-frequency induction coil for tempering, and cooling to the normal temperature after tempering.
In the second step and the third step, the roller sets are used in each process to drive the workpieces to advance to finish the feeding action, the distance between any two adjacent rollers 10 in the roller sets does not exceed 1/3 of the length of the workpieces, and if the distance between the rollers 10 is too long, the steel pipe is prone to tilting downwards under the action of gravity in the conveying process due to insufficient force points, so that the steel pipe cannot enter a station exactly.
The roller 10 in the roller set used in the third step forms an included angle of 30-60 degrees with the advancing direction of the workpiece, and because the roller 10 is not perpendicular to the advancing direction of the workpiece, when the roller 10 rotates, the friction force generated between the roller 10 and the external thread steel pipe 2 can be converted into a driving force for driving the external thread steel pipe 2 to advance along the production line direction and a driving force perpendicular to the advancing direction through decomposition, and the driving force perpendicular to the advancing direction drives the external thread steel pipe 2 to do self-rotation motion, and the motion mode can ensure that the external thread steel pipe 2 is uniformly heated and cooled during quenching and cooling, so that an ideal metallographic structure can be obtained, the external thread steel pipe 2 can be effectively prevented from bending deformation under the action of gravity, the pressure of a subsequent finishing straightening process is reduced, and the finishing straightening process can be even replaced.
And in the step two, the heat preservation homogenization time of the heat preservation electric furnace 6 is not less than the total time of the circular steel tube 1 staying in the heat preservation electric furnace 6 and is not less than 3min by adjusting the feeding speed of the roller 10, so that the heat penetration internal and external temperature uniformity of the whole steel tube 1 is ensured, and the waste products caused by thread deformation during cooling shrinkage caused by the non-uniform internal and external temperature during the subsequent manufacture of external threads by using the three-roll hot rolling forming device 7 are prevented.
Because the density of austenite is highest, the specific volume is minimum and the linear expansion coefficient is maximum in various metallographic structures of steel, and the quenching of the steel is a heat treatment process for heating the steel to be above the critical temperature to ensure that all or part of the steel is austenitized, and then carrying out martensite transformation by rapid cooling at a cooling speed higher than the critical cooling speed, the temperature for heating the round steel pipe 1 by the ultrasonic induction heating coil 3 for forming in the second step is 820-840 ℃, and the austenite transformation critical temperature of the used material cannot be exceeded, namely the quenching temperature in the third step is as follows: 850 +/-5 deg. ,
and the cooling mode of water-cooling quenching in the third step is that an annular water-cooling ring 8 is arranged in the advancing direction of the workpiece, and the water-cooling ring 8 sprays cooling water to the periphery of the outer surface of the external thread steel pipe 2. The included angle between the spraying direction of the cooling water in the water cooling ring 8 and the external thread steel pipe 2 is 45-75 degrees, and the flow of the water cooling ring is up to 120 liters/min, so that the whole external thread steel pipe 2 can be effectively and rapidly cooled.
The water removing method used in the water removing procedure in the third step is that the high-pressure air sleeve 9 is arranged along the advancing direction of the external thread steel pipe 2, the high-pressure air sleeve 9 surrounds the external thread light pipe 2 to spray compressed air, and redundant water stains are scraped from the external thread steel pipe 2 by utilizing the compressed air, otherwise, the water stains can influence the effect of subsequent tempering treatment, so that the surface hardness of the external thread steel pipe 2 is uneven.
The tempering temperature in the third step is 350-360 degrees, the tempering temperature is used for forming a tempering Torschaum body in the steel, the elastic limit, the yield hardness and the yield ratio of the external thread steel pipe 2 are improved, and meanwhile, the external thread steel pipe has certain plasticity and toughness.
The external thread steel pipe 2 obtained after the treatment of the process steps has good metallographic structure and uniform section hardness, the HRC is controlled to be 30-34, the tensile strength is not less than 720MPa, the overall quality is stable, the straightness required by the process can be achieved under the condition of not carrying out finishing straightening, and the performance requirement of the anchor rod can be met. Compared with the traditional process flow, the whole process flow reduces the equipment investment of the finishing and straightening process and improves the overall benefit.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The preparation process of the external thread steel pipe for the anchor rod is characterized by comprising the following steps of:
firstly, a round pipe blank is made into a round workpiece through hot piercing and reducing diameter and wall continuous rolling;
step two, molding, namely transferring the workpiece obtained in the step one to an external thread molding production line, heating the workpiece to a process required temperature through a molding superaudio induction heating coil, then putting the workpiece into a heat-preservation electric furnace for heat preservation and homogenization, and after the heat preservation and homogenization, putting the workpiece into a processing station of an external thread three-roll hot rolling molding device to obtain a workpiece with an external surface rolled with a regular external thread;
quenching and tempering, namely heating the workpiece obtained in the step two to a critical quenching temperature by using a superaudio induction heating coil, then rapidly cooling by using cooling water, removing water stains inside and outside the workpiece by using a water removal device, tempering and tempering by using a high-frequency induction coil for tempering, and cooling to the normal temperature after tempering; in the second step and the third step, each process uses a roller set to drive the workpiece to advance to finish the feeding action, wherein the rollers of the roller set in the third step form an included angle of 30-60 degrees with the advancing direction of the workpiece.
2. The process for preparing an externally threaded steel pipe for a rock bolt according to claim 1, wherein the distance between any two adjacent rollers in the roller set does not exceed 1/3 the length of the workpiece.
3. The preparation process of the externally threaded steel pipe for the anchor rod according to claim 1, wherein the heat preservation homogenization time of the heat preservation electric furnace is not less than 3 min.
4. The process for preparing an externally threaded steel pipe for an anchor rod according to claim 1, wherein the temperature of the workpiece heated by the ultrasonic induction heating coil in the second step is 820 ℃ to 840 ℃.
5. The process for preparing an externally threaded steel pipe for a rock bolt according to claim 1, wherein the quenching temperature in the third step is 850 ± 5 °.
6. The preparation process of the externally threaded steel pipe for the anchor rod according to claim 1, wherein the cooling manner of the water-cooling quenching in the third step is to arrange an annular water-cooling ring in the advancing direction of the workpiece, and the water-cooling ring sprays cooling water to the outer surface of the workpiece.
7. The preparation process of the externally threaded steel pipe for the anchor rod according to claim 6, wherein an included angle between the spraying direction of the cooling water in the water cooling ring and the workpiece is 45-75 °.
8. The process for preparing an externally threaded steel pipe for an anchor rod according to claim 1, wherein the temperature of the cooling water is 25 ° to 30 °.
9. The process for preparing an externally threaded steel pipe for an anchor rod according to claim 1, wherein the water removal device in the third step is a high-pressure air jacket.
10. The process for preparing an externally threaded steel pipe for an anchor rod according to claim 1, wherein the tempering temperature in the third step is 350 to 360 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911355370.6A CN110964894A (en) | 2019-12-25 | 2019-12-25 | Preparation process of external thread steel pipe for anchor rod |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911355370.6A CN110964894A (en) | 2019-12-25 | 2019-12-25 | Preparation process of external thread steel pipe for anchor rod |
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| CN110964894A true CN110964894A (en) | 2020-04-07 |
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| CN201911355370.6A Pending CN110964894A (en) | 2019-12-25 | 2019-12-25 | Preparation process of external thread steel pipe for anchor rod |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112575150A (en) * | 2020-12-28 | 2021-03-30 | 江苏省镔鑫钢铁集团有限公司 | Deformed steel bar quenching process and quenching equipment |
| CN115612799A (en) * | 2022-10-24 | 2023-01-17 | 江苏利淮钢铁有限公司 | Online normalizing device and online normalizing process for low-alloy high-strength steel |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| UA7091U (en) * | 2004-08-02 | 2005-06-15 | Volodymyr Volodymyrov Ivantsov | Anchor component beam |
| CN203955703U (en) * | 2014-06-18 | 2014-11-26 | 中冶南方工程技术有限公司 | A kind of fine grain screw-thread steel hot rolling line |
| CN108590722A (en) * | 2018-05-24 | 2018-09-28 | 山东安科矿山支护技术有限公司 | A kind of processing unit (plant) and its processing technology of the hollow bolt body of rod |
| CN109022731A (en) * | 2018-08-09 | 2018-12-18 | 江苏星火特钢有限公司 | A kind of high intensity high corrosion resistance two-phase stainless screw-thread steel and its production method |
| CN110026742A (en) * | 2019-04-29 | 2019-07-19 | 成都现代万通锚固技术有限公司 | A kind of manufacturing process of anchor drill steel |
-
2019
- 2019-12-25 CN CN201911355370.6A patent/CN110964894A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| UA7091U (en) * | 2004-08-02 | 2005-06-15 | Volodymyr Volodymyrov Ivantsov | Anchor component beam |
| CN203955703U (en) * | 2014-06-18 | 2014-11-26 | 中冶南方工程技术有限公司 | A kind of fine grain screw-thread steel hot rolling line |
| CN108590722A (en) * | 2018-05-24 | 2018-09-28 | 山东安科矿山支护技术有限公司 | A kind of processing unit (plant) and its processing technology of the hollow bolt body of rod |
| CN109022731A (en) * | 2018-08-09 | 2018-12-18 | 江苏星火特钢有限公司 | A kind of high intensity high corrosion resistance two-phase stainless screw-thread steel and its production method |
| CN110026742A (en) * | 2019-04-29 | 2019-07-19 | 成都现代万通锚固技术有限公司 | A kind of manufacturing process of anchor drill steel |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112575150A (en) * | 2020-12-28 | 2021-03-30 | 江苏省镔鑫钢铁集团有限公司 | Deformed steel bar quenching process and quenching equipment |
| CN112575150B (en) * | 2020-12-28 | 2021-11-26 | 江苏省镔鑫钢铁集团有限公司 | Deformed steel bar quenching process and quenching equipment |
| CN115612799A (en) * | 2022-10-24 | 2023-01-17 | 江苏利淮钢铁有限公司 | Online normalizing device and online normalizing process for low-alloy high-strength steel |
| CN115612799B (en) * | 2022-10-24 | 2024-06-11 | 江苏利淮钢铁有限公司 | Online normalizing device and online normalizing process for low-alloy high-strength steel |
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Application publication date: 20200407 |