CN110315286B - Welding process of integrated drill rod for blast furnace - Google Patents
Welding process of integrated drill rod for blast furnace Download PDFInfo
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- CN110315286B CN110315286B CN201910452350.4A CN201910452350A CN110315286B CN 110315286 B CN110315286 B CN 110315286B CN 201910452350 A CN201910452350 A CN 201910452350A CN 110315286 B CN110315286 B CN 110315286B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
Abstract
The invention discloses a welding process of an integrated drill rod for a blast furnace, which is used for welding a drill bit, the drill rod and a drill rod tail, and comprises the steps of integrally carrying out heat treatment on the drill bit, the drill rod and the drill rod tail to be welded, polishing the welding part, preheating the welding part at 300-400 ℃, vertically welding from the bottom of a butt joint surface along the circumferential direction of the drill rod from inside to outside by using an electric welding rod, and transversely welding along the length direction of the drill rod by using the electric welding rod when welding to 1/2 of the depth of a weld crater, wherein the welding surface is in a semi-circular arc shape; preserving the temperature and cooling the welding part; and performing shot blasting on the welding part. The drill rod, the drill bit and the drill shank are welded into a whole, so that assembly accessories are reduced, and the problem that a thread part is easy to break is solved; the optimized combination of the welding process obviously improves the fatigue strength and the service life of the welding part of the drill rod, realizes that one set of tapping drill can be repeatedly used, improves the working efficiency and reduces the production cost.
Description
Technical Field
The invention relates to the technical field of blast furnace ironmaking equipment processing in the metallurgical industry, in particular to a welding process of an integrated drill rod for a blast furnace.
Background
At present, the connection form of a drilling tool used for a blast furnace tapping hole of domestic iron and steel smelting enterprises adopts components such as a drill bit, a drill rod, a connecting sleeve, a drill bit shank and the like which are respectively connected with each other and finally connected with a tapping machine impactor. The integral drill rod is an advanced drilling tool form, the drill rod, a drill bit and a drill shank are connected into the integral drill rod through threads, due to the fact that a plurality of connecting parts are arranged, sealing is not tight, the thread part at the connecting part is relatively weak, the thread part is easy to break under the action of impact force of a tapping machine, the drill rod connected through the threads is easy to break due to high temperature and high torque during tapping operation, the drill rod falls into an iron hole and is difficult to take out, all parts of a blast furnace tapping system are scrapped in advance, the consumption of the parts is large, the drill rod is difficult to dismount due to high-temperature deformation and the like after scrapping, a series of problems are brought to actual production, and meanwhile, the production cost is increased.
Disclosure of Invention
The invention aims to provide a welding process of an integrated drill rod for a blast furnace, which aims to solve the problems that the connection part of the integrated drill rod is easy to break and the connection is not firm enough.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a welding process of an integrated drill rod for a blast furnace is used for welding a drill bit, the drill rod and a drill shank to form a set of blast furnace tapping hole drilling tool, and comprises the following steps:
step one, carrying out heat treatment on the whole of a drill bit, a drill rod and a drill shank to be welded to ensure that the Rockwell hardness HRC of the surfaces of the drill bit, the drill rod and the drill shank reaches 38-42;
polishing the welding parts of the drill rod, the drill bit and the drill shank to be welded to ensure that the welding parts have no interlayer and no crack and the surface finish reaches Ra1.6;
thirdly, preheating the welding parts of the bit to be welded, the end part of the drill rod and the drill shank at 300-400 ℃, and preventing the surface from generating an oxidation phenomenon;
fourthly, vertically welding the drill rod to be welded, the drill bit and the drill bit tail from the middle of the butt joint surface of the drill rod to be welded from inside to outside along the circumferential direction of the drill rod by using an electric welding rod, wherein the welding thickness of each layer is less than 0.5 mm;
fifthly, when the welding is carried out to 1/2 of the depth of the crater according to the method in the fourth step, the electric welding rod starts to carry out transverse welding along the length direction of the drill rod, the welding length of two ends exceeds the crater by 4.5-5.0mm, the welding thickness of each layer is less than 0.5mm, the welding position is 0.5-0.8mm higher than the circumference base surface of the drill rod, and the welding surface is in a semi-circular arc shape;
step six, wrapping the periphery of the welding part with heat preservation cotton, preserving heat, and naturally cooling to room temperature;
seventhly, shot blasting is carried out on the welding part, the shot is cast steel shot, the diameter of the shot is 0.4-1.0mm, and the density is 5500kg/m3The spraying speed is 120-200m/s, and the spraying angle is 15 ︒ -90 ︒, so that the residual compressive stress generated on the surface layer of the welding part is eliminated, and the generation of fatigue cracks of the welding part is inhibited.
Preferably, the welding rod in the fourth step is a steel welding rod with the diameter of 3.2mm, and the welding rod is placed in a heat preservation box in advance and is subjected to heat preservation for 2 hours at the temperature of 400 ℃ and taken at any time.
Preferably, the welding rod used in the transverse welding in the fifth step is a steel welding rod with the specification of phi 4.0mm, and the welding rod is placed in a heat preservation box in advance and is subjected to heat preservation for 2 hours at 400 ℃ and taken at any time.
The drill rod, the drill bit and the drill shank are welded into a whole, so that assembly accessories are reduced; the thread connection of the common connection part is designed into a welding form, so that the problem that the thread part is easy to break is avoided; the optimized combination of the welding process obviously improves the fatigue strength and the service life of the welding part of the drill rod, and greatly improves key technologies such as impact resistance, wear resistance and the like. The average service life of the drill rod welded by the process reaches 10-15 heats, which is 3-5 times of that of the drill rod welded by the common welding process, so that the production efficiency is improved, and the production cost is reduced.
Drawings
FIG. 1 is a schematic view of the construction of two drill rods welded to each other in the present invention;
FIG. 2 is a schematic view of two shank rod connection surfaces being welded vertically;
FIG. 3 is a schematic view of two shank link faces being welded transversely;
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The welding process of the integrated drill rod for the blast furnace as shown in figure 1 is used for welding a drill bit, a drill rod and a drill shank to form a set of blast furnace tapping hole drilling tool, and comprises the following steps:
step one, carrying out heat treatment on the whole of a drill bit, a drill rod and a drill shank to be welded to ensure that the Rockwell hardness HRC of the surfaces of the drill bit, the drill rod and the drill shank reaches 38-42;
polishing the welding parts of the drill rod, the drill bit and the drill shank to be welded to ensure that the welding parts have no interlayer and no crack and the surface finish reaches Ra1.6;
thirdly, preheating the welding parts of the bit to be welded, the end part of the drill rod and the drill shank at 300-400 ℃, and preventing the surface from generating an oxidation phenomenon;
step four, as shown in figure 2, welding rods with the diameter of 3.2mm are used for vertically welding from inside to outside along the circumferential direction of the drill rods from the middle parts of the butt joint surfaces of the drill rods to be welded, the drill bits and the drill tails, and the welding thickness of each layer is less than 0.5 mm; the welding rod is placed in a heat preservation box in advance and is preserved for 2 hours at 400 ℃, and the welding rod can be taken at any time.
Step five, as shown in fig. 3, when welding to 1/2 of the depth of the welding crater according to the method of the step four, welding electrodes with the specification of phi 4.0mm are used for carrying out transverse welding along the length direction of the drill rod, the welding length of two ends exceeds the welding crater by 4.5-5.0mm, the welding thickness of each layer is less than 0.5mm, the welding part is 0.5-0.8mm higher than the circumferential basal plane of the drill rod, and the welding surface is in a semi-arc shape; the welding rod is placed in a heat preservation box in advance and is preserved for 2 hours at 400 ℃, and the welding rod can be taken at any time.
Step six, wrapping the periphery of the welding part with heat preservation cotton, preserving heat, and naturally cooling to room temperature;
seventhly, shot blasting is carried out on the welding part, the shot is cast steel shot, the diameter of the shot is 0.4-1.0mm, and the density is 5500kg/m3Injection velocity of 120200m/s and a spray angle of 15 ︒ -90 ︒, residual compressive stress generated on the surface layer of the welding part is eliminated, and fatigue cracks of the welding part are inhibited.
The drill rod, the drill bit and the drill shank are welded into a whole, so that assembly accessories are reduced; the thread connection of the common connection part is designed into a welding form, so that the problem that the thread part is easy to break is avoided; the optimized combination of the welding process obviously improves the fatigue strength and the service life of the welding part of the drill rod, and greatly improves key technologies such as impact resistance, wear resistance and the like. The average service life of the drill rod welded by the process reaches 10-15 heats, which is 3-5 times of that of the drill rod welded by the common welding process, so that the production efficiency is improved, and the production cost is reduced.
Claims (3)
1. A welding process of an integrated drill rod for a blast furnace is used for welding a drill bit, the drill rod and a drill shank to form a set of blast furnace tapping hole drilling tool, and is characterized in that: it comprises the following steps:
step one, carrying out heat treatment on the whole of a drill bit, a drill rod and a drill shank to be welded to ensure that the Rockwell hardness HRC of the surfaces of the drill bit, the drill rod and the drill shank reaches 38-42;
polishing the welding parts of the drill rod, the drill bit and the drill shank to be welded to ensure that the welding parts have no interlayer and no crack and the surface finish reaches Ra1.6;
thirdly, preheating the welding parts of the bit to be welded, the end part of the drill rod and the drill shank at 300-400 ℃, and preventing the surface from generating an oxidation phenomenon;
fourthly, vertically welding the drill rod to be welded, the drill bit and the drill bit tail from the middle of the butt joint surface of the drill rod to be welded from inside to outside along the circumferential direction of the drill rod by using an electric welding rod, wherein the welding thickness of each layer is less than 0.5 mm;
fifthly, when the welding is carried out to 1/2 of the depth of the crater according to the method in the fourth step, the electric welding rod starts to carry out transverse welding along the length direction of the drill rod, the welding length of two ends exceeds the crater by 4.5-5.0mm, the welding thickness of each layer is less than 0.5mm, the welding position is 0.5-0.8mm higher than the circumference base surface of the drill rod, and the welding surface is in a semi-circular arc shape;
step six, wrapping the periphery of the welding part with heat preservation cotton, preserving heat, and naturally cooling to room temperature;
seventhly, shot blasting is carried out on the welding part, the shot is cast steel shot, the diameter of the shot is 0.4-1.0mm, and the density is 5500kg/m3The spraying speed is 120-200m/s, and the spraying angle is 15 ︒ -90 ︒, so that the residual compressive stress generated on the surface layer of the welding part is eliminated, and the generation of fatigue cracks of the welding part is inhibited.
2. The welding process of the integrated drill rod for the blast furnace according to claim 1, characterized in that: in the fourth step, the welding rod is made of steel welding rod with the diameter of 3.2mm, and is placed in a heat preservation box in advance for heat preservation at 400 ℃ for 2 hours and taken at any time.
3. The welding process of the integrated drill rod for the blast furnace according to claim 1, characterized in that: and fifthly, adopting a steel welding rod with the specification of phi 4.0mm as the welding rod for transverse welding, putting the welding rod in a heat preservation box in advance, preserving heat for 2 hours at 400 ℃, and taking the welding rod at any time.
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| CN201910452350.4A CN110315286B (en) | 2019-05-28 | 2019-05-28 | Welding process of integrated drill rod for blast furnace |
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| CN111299971A (en) * | 2020-03-02 | 2020-06-19 | 贵州捷盛钻具股份有限公司 | Welding process of drill rod and drill shank |
| CN114633218B (en) * | 2022-03-04 | 2023-09-19 | 贵州捷盛钻具股份有限公司 | Surface treatment method and device for drill rod and drill rod manufacturing method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106283118A (en) * | 2016-08-30 | 2017-01-04 | 云南云铝涌鑫铝业有限公司 | Anode rod and the manufacture method of anode rod |
| CN107138927A (en) * | 2017-07-05 | 2017-09-08 | 泰州市东方传动技术有限公司 | A kind of planet carrier shaft welding assembly technique for welding |
| CN207620738U (en) * | 2017-10-19 | 2018-07-17 | 东营威玛石油钻具有限公司 | A kind of wellbore shaping feature type drilling rod |
| CN108620808A (en) * | 2018-05-09 | 2018-10-09 | 河南鑫轴传动机械有限公司 | A kind of transmission shaft injury repair technique |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106283118A (en) * | 2016-08-30 | 2017-01-04 | 云南云铝涌鑫铝业有限公司 | Anode rod and the manufacture method of anode rod |
| CN107138927A (en) * | 2017-07-05 | 2017-09-08 | 泰州市东方传动技术有限公司 | A kind of planet carrier shaft welding assembly technique for welding |
| CN207620738U (en) * | 2017-10-19 | 2018-07-17 | 东营威玛石油钻具有限公司 | A kind of wellbore shaping feature type drilling rod |
| CN108620808A (en) * | 2018-05-09 | 2018-10-09 | 河南鑫轴传动机械有限公司 | A kind of transmission shaft injury repair technique |
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