CN205368452U - Cold tandem rolling welding seam heat treatment device of high -carbon high -strength steel - Google Patents
Cold tandem rolling welding seam heat treatment device of high -carbon high -strength steel Download PDFInfo
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- CN205368452U CN205368452U CN201521071961.8U CN201521071961U CN205368452U CN 205368452 U CN205368452 U CN 205368452U CN 201521071961 U CN201521071961 U CN 201521071961U CN 205368452 U CN205368452 U CN 205368452U
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Abstract
The utility model discloses a cold tandem rolling welding seam heat treatment device of high -carbon high -strength steel, including C shape travelling car, laser welder, the input and the power of superaudio switch board are connected, and the output AND operation is carried out an input of cabinet and is connected, another input and PLC control control console connection of cabinet are carried out in the operation, three output respectively with elevating system, super audio -frequency transformer, water circulative cooling headtotail refrigerates, be fixed with infrared temperature probe on moving movable support, super audio -frequency transformer is fixed to the top, and bolt fastening induction heater is used to the below, and a refrigeration water circulative cooling system is connected with super audio -frequency transformer, induction heater's inlet outlet respectively through the pipeline. Adopt PLC control operation deck plate accurate control thermal treatment temperature and thermal treatment time, can eliminate welding stress, reduce substantially the disconnected zoning of welding seam and produce, improved equipment operation rate, effectively reduced the accident handling capacity.
Description
Technical field
This utility model relates to online weld seam heat treatment technics after a kind of Continuous Cold Rolled Strip welds, it is adaptable to weld seam heat treatment after coiled strip steel welding before and after in coupled pickling and tandem mill production process, particularly to a kind of high-carbon high-strength steel cold continuous rolling weld seam annealing device.
Background technology
Continuous rolling in order to ensure coupled pickling and tandem mill, it is necessary to the afterbody of the head of next coiled strip steel Yu previous coiled strip steel is welded together at coupled pickling and tandem mill entrance area welding machine.Usual welding machine is the key equipment that coupled pickling and tandem mill normally produces.Generally have flash of light lap welder and laser welder, for product specification, coupled pickling and tandem mill configuration that kind coverage rate is bigger be import laser welder.The operation principle of laser welder be generating laser under high frequency voltage effect, by high-purity CO2、N2Carry out ion transition with He by the 1:5:24 mixing gas formed and produce laser; by optic path, reflection; under protective gas helium-atmosphere; laser beam is beaten volume before and after strip steel and is passed through on the joint close sheared; melted seam crossing metal; make front and back band steel link into an integrated entity after melted, it is achieved production process endless rolling and produce continuously.
Existing coupled pickling and tandem mill laser welder carries heater, and what take is the heating of side weld edge fit, and this heater and mode of heating can only meet ordinary carbon steel and Medium and low intensity strip steel welding performance and weldquality requirement, keeps weld seam broken belt rate at reduced levels.High strength steel for the high-carbon steel of carbon containing more than 0.40% and more than tensile strength 590MPa, owing to carbon is high or intensity is high, strip steel hardness is big, welding stress is big, although taking Heat artificially measure, strip steel weld joint place yet suffers from stress, at tension force with along embrittlement broken belt under the various bending force effect of journey, processes and bothers very much.Usual weld seam broken belt rate reaches 15～30%, has a strong impact on the properly functioning of production, adds labor intensity and accident treatment workload.
Utility model content
The purpose of this utility model is to increase a set of high-carbon high-strength steel cold continuous rolling weld seam on existing laser welder basis, control heat treatment temperature and heat treatment time, eliminate welding stress, improve high-carbon high-strength steel laser annealing device, a kind of high-carbon high-strength steel cold continuous rolling weld seam burning optimization on line technique is provided simultaneously, and the uniformity of weld strength, is greatly reduced weld seam belt phenomenon and produces after selecting different heat treatment technological parameter to weld according to different steel grade phosphorus content, strength grade, strip steel specification.
For achieving the above object, this utility model takes techniques below scheme: a kind of high-carbon high-strength steel cold continuous rolling weld seam annealing device, including C shape travelling car, laser welder, superaudio switch board, operation performs cabinet, support bracket, elevating mechanism, traversing carriage, superaudio transformator, induction heater, infrared temperature probe, chilled water circulating cooling system, PLC controls operating board, bolt, cable, it is characterized in that, superaudio switch board, operation performs cabinet and is fixed on C shape travelling car platform, the input of superaudio switch board is connected with power supply by cable, the input that outfan performs cabinet by cable with operation is connected；Operation is performed another input of cabinet and is connected with the PLC outfan controlling operating board by cable, and three outfans are connected with elevating mechanism, superaudio transformator, chilled water circulating cooling system respectively by cable；In the upper surface of C shape travelling car, it is connected with support bracket, support is vertically installed with guide rail；With the fixing elevating mechanism of bolt on support bracket；One traversing carriage, the contiguous block in the middle of its side is fixing with the nut seat on elevating mechanism to be connected, and the connector on both sides is flexibly connected with the guide rail on support bracket；Crosspiece is fixed with the infrared temperature probe being connected with power supply, superaudio transformator fixed above, the lower section fixing induction heater of bolt in the middle of traversing carriage, is connected by cable between superaudio transformator and induction heater；One chilled water circulating cooling system, is connected with the intake-outlet of superaudio transformator, induction heater respectively by pipeline.
Described elevating mechanism is made up of motor, shaft coupling, ball screw, nut seat, a bearing.
The connector on described traversing carriage both sides is the concave shaped groove with seam.
Described induction heater is made up of rectangle pipe fitting, ferrite and insulator.
Described ferrite is concave shaped cuboid block.
Described chilled water circulating cooling system is made up of refrigeration machine, water tank, inlet and outlet pipe lines.
A kind of high-carbon high-strength steel cold continuous rolling weld seam Technology for Heating Processing, including high-carbon high-strength steel cold continuous rolling weld seam annealing device, it is characterised in that processing step is:
1) laser weld is complete, presses PLC and controls operating table surface Systemon-board startup button, opens chilled water circulating cooling system；
2) control the prompting step on operating board panel according to PLC, set heat treatment temperature, heat treatment time, heating distance, select mode of operation manually or automatically；
3), manually or automatically under pattern, starting PLC and control induction heater letdown procedure on operating board panel, induction heater drops to lower edge distance strip steel upper surface setpoint distance, and induction heater stops declining；
4), manually or automatically under pattern, start PLC and control heating schedule on operating board panel, infrared temperature probe monitoring heat treatment temperature, after reaching desired temperature, insulation, reaches to set heat treatment time, starts PLC control operating board panel heating and shuts down procedure and climb procedure, induction heater stops heating and rises to 10mm～15mm stopping below elevating mechanism stroke extreme higher position, completes whole weld seam heat treatment step.
Described heat treatment temperature is 600 DEG C～720 DEG C, and heat treatment time is 30 seconds～60 seconds.
It is 0.8mm～1.5mm that described induction heater drops to the distance of lower edge distance strip steel upper surface.
This utility model is compared with prior art, its advantage is to increase a set of high-carbon high-strength steel cold continuous rolling weld seam annealing device on existing laser welder basis, and a kind of high-carbon high-strength steel cold continuous rolling weld seam burning optimization on line technique of corresponding offer, adopt PLC to control operating board panel and accurately control heat treatment temperature and heat treatment time, eliminate welding stress, improve the uniformity of weld strength after high-carbon high-strength steel laser welds, weld seam belt phenomenon is greatly reduced produce, improve equipment operation rate, effectively reduce accident treatment amount.Newly-increased weld seam annealing device is simple to operate, and parameter is easily controlled, and result of use is good.
Accompanying drawing explanation
Fig. 1 is this utility model high-carbon high-strength steel cold continuous rolling weld seam annealing device structural representation.
Fig. 2 is that in Fig. 1, support bracket is connected right view with C shape travelling car, elevating mechanism, traversing carriage.
Fig. 3 is that in Fig. 1, support bracket is connected top view with elevating mechanism, traversing carriage.
Fig. 4 is that this utility model PLC controls operating board panel schematic diagram.
Fig. 5 is this utility model induction heater structural representation.
Fig. 6 is Fig. 5 induction heater A-A to sectional view.
Fig. 7 is Fig. 5 induction heater B-B to sectional view.
In figure: 1, C shape travelling car, 2, laser welder, 201, generating laser, 202, optic path, protective gas pipeline, 3, superaudio switch board, 4, operation performs cabinet, 5, support bracket, 501, guide rail, 6, elevating mechanism, 601, motor, 602, ball-screw, 603, nut seat, 604, prop up bearing, 7, traversing carriage, 701, connector, 8, superaudio transformator, 9, induction heater, 901, rectangle pipe fitting, 902, ferrite, 903, insulator, 904, nylon bolt, 10, infrared temperature probe, 11, chilled water circulating cooling system, 12, PLC controls operating board, 13, bolt, 14, strip steel, 15, weld seam, 16, clamp system.
Detailed description of the invention
Below in conjunction with drawings and Examples, this utility model is expanded on further.
Referring to Fig. 1～Fig. 7; such as Fig. 1; a kind of high-carbon high-strength steel cold continuous rolling weld seam annealing device; including C shape travelling car 1; generating laser 201 fixing on C shape travelling car 1 platform and optic path, protective gas pipeline 202 constitute existing laser welder 2; when C shape travelling car 1 advances or retreats, laser exit motion track is on weld seam 15 length direction.Superaudio switch board 3, operation perform cabinet 4 and are fixed on C shape travelling car 1 platform, and the input of superaudio switch board 3 is connected with power supply by cable, and the input that outfan performs cabinet 4 by cable with operation is connected；Operation is performed another input of cabinet 4 and is connected with the PLC outfan controlling operating board 12 by cable, and three outfans are connected with elevating mechanism 6, superaudio transformator 8, chilled water circulating cooling system 11 respectively by cable.In the upper surface of C shape travelling car 1, connect support bracket 5 with bolt 13, support is vertically installed with guide rail 501 (referring to Fig. 2)；With bolt 13 and Interal fixation elevating mechanism 6 on support bracket 5, described elevating mechanism 6 is made up of motor 601, shaft coupling, ball screw 602, nut seat 603, a bearing 604, the spindle nose of motor 601 connects ball screw 602 by shaft coupling, ball screw 602 is provided with nut seat 603, fixing ball screw 602 bearing 604 (referring to Fig. 2, Fig. 3).One traversing carriage 7, the contiguous block in the middle of its side is fixing with the nut seat 603 on elevating mechanism 6 to be connected, and the connector 701 on both sides is the concave shaped groove with seam, is flexibly connected (referring to Fig. 3) with the guide rail 501 on support bracket 5.The middle crosspiece of traversing carriage 7 is fixed with the infrared temperature probe 10 being connected with power supply, superaudio transformator 8 fixed above, induction heater 9 fixed by lower section bolt 13, described induction heater 9 is made up of rectangle pipe fitting 901, ferrite 902 and insulator 903, rectangle pipe fitting 901 is copper pipe fitting, ferrite 902 is concave shaped cuboid block, each small bits of iron oxysome 902 is installed on lower floor's rectangle pipe fitting 901, insulate with insulator 903 between rectangle pipe fitting 901, then fix (referring to Fig. 5, Fig. 6, Fig. 7) with nylon bolt 904.Being provided with patch panel (referring to Fig. 5) on induction heater 9 upper end rectangle pipe fitting 901, be connected with superaudio transformator 8 by cable, after rectangle pipe fitting 901 energising, ferrite 902 produces magnetic field, can carry out sensing heating.One chilled water circulating cooling system 11, is connected with the intake-outlet of superaudio transformator 8, induction heater 9 respectively by pipeline.
Such as Fig. 1, in conjunction with Fig. 5, the two ends of induction heater 9 are provided with intake-outlet, it is connected with the intake-outlet of chilled water circulating cooling system 11 respectively by flexible duct, described chilled water blood circulation 11 is made up of refrigeration machine (not shown), water tank (not shown), inlet and outlet pipe lines, water in water tank is flowed into from one end of induction heater 9 rectangle pipe fitting 901 by pipeline after cryocooled, flow out from the other end of induction heater 9 rectangle pipe fitting 901 after cooling rectangle pipe fitting 901, return to water tank.
As shown in Figure 4, PLC controls to be provided with on the panel of operating board 12 system start-up, parameter settings, formulation data, manual mode, automatic startup, crawl rising, crawl decline, heating starting, heating stopping, cooling-water machine are opened, cold water office, reset, back to zero, use help button, arranged by parameter and can show steel grade, current location, displacement, heat treatment temperature, heat treatment time on panel, and PLC is controlled parameter be transported to operation perform cabinet 4 perform.
A kind of high-carbon high-strength steel cold continuous rolling weld seam Technology for Heating Processing, including high-carbon high-strength steel cold continuous rolling weld seam annealing device, processing step is:
1) laser weld is complete, presses PLC and controls system start-up button on operating board 12 panel, opens chilled water circulating cooling system 11；
2) control the prompting step on operating board 12 panel according to PLC, set heat treatment temperature, heat treatment time, heating distance, select mode of operation manually or automatically；
3), manually or automatically under pattern, starting PLC and control induction heater 9 letdown procedure on operating board 12 panel, induction heater 9 drops to lower edge distance strip steel 14 upper surface setpoint distance, and induction heater 9 stops declining；
4), manually or automatically under pattern, start PLC and control heating schedule on operating board 12 panel, infrared temperature probe 10 monitors heat treatment temperature, after reaching desired temperature, insulation, reaches to set heat treatment time, starts PLC control operating board 12 panel heating and shuts down procedure and climb procedure, induction heater 9 stops heating and rises to 10mm～15mm stopping below elevating mechanism 6 stroke extreme higher position, completes whole weld seam heat treatment step.Strip steel 14 after weld seam heat treatment enters back into five frame tandem rollings through entry loop, straightening, pickling, hot-air seasoning, middle kink, disk trimming, outlet looping, it is achieved pickling milling train continuous rolling.
According to the steel grade of high-carbon high-strength steel, belt steel thickness, heat treatment temperature is selected within the scope of 600 DEG C～720 DEG C, selecting heat treatment time within the scope of 30 seconds～60 seconds, induction heater 9 drops to the distance of lower edge distance strip steel 14 upper surface and selects within the scope of 0.8mm～1.5mm.
A kind of high-carbon high-strength steel cold continuous rolling weld seam annealing device designed according to the technical solution of the utility model and weld seam Technology for Heating Processing, the high-carbon high-strength steel weld joint burning optimization on line of raw thickness 1.5mm～6.0mm, width 1450mm can be realized, width of heating 30mm, mode of heating is one side plane heating mode.Superaudio transformator 8 selects IGBT superaudio power supply series GGC120 model, rated output power 100KW.According to in-site installation condition, superaudio switch board 3, operation perform cabinet 4 the best and are fixed on C shape travelling car 1 platform.Owing to producing significantly high temperature when the copper pipe fitting of the transformator of superaudio transformator 8, induction heater 9 works, it is therefore desirable to the water-cooled after refrigeration is but.Superaudio transformator 8, induction heater 9 Cooling Design share a chilled water circulating cooling system 11, it is possible to reduce take up an area and be easy to control.The overall dimensions of chilled water circulating cooling system 11 is 700mm (width) × 700mm (thickness) × 1800mm (height), it is arranged near C shape travelling car 1, is connected with the intake-outlet of superaudio transformator 8, induction heater 9 with the cable testing bridge of laser welder 2 by flexible duct.It is also be connected with superaudio transformator 8 by flexible cable that operation performs cabinet 4.
Embodiment:
The supplied materials that hot continuous rolling factory provides is high-carbon steel or high-strength steel blank, raw material specification is 1.5mm～6.0mm thickness, 1000mm～1450mm width, in conjunction with Fig. 1～Fig. 7, joint close after the cutter (not shown) on C shape travelling car 1 is sheared is rolled up before and after strip steel 14, being clamped by front and back band steel 14 clamp system 16, press down, strip steel 14 is positioned at production line podium level, now, strip steel 14 is in impaction state.C shape travelling car 1 transverse shifting from right to left, drive laser welder 2 traversing, laser gun opening's edge seam direction transverse shifting, laser beam is beaten at strip steel 14 seaming position continuously, constantly melted seam crossing metal, after laser welder 2 light beam transversal moves out strip steel 14 width, front and back band steel 14 is melt into one by the metal that seam crossing melts.Once weld, now strip steel 14 weld seam 15 position is in heating inductor 9 position directly below, press PLC and control system start-up button on operating board 12 panel, open chilled water circulating cooling system 11, control Selection parameter on operating board 12 panel at PLC to arrange, according to concrete steel grade, heat treatment temperature selects to set occurrence within the scope of 600 DEG C～720 DEG C, selected to set concrete heat treatment time within the scope of 30 seconds～60 seconds, within the scope of 0.8mm～1.5mm, select to set induction heater 9 lower edge specifically heat distance with strip steel 14 upper surface.If selection manual mode, pressing PLC and control crawl decline button on operating board 12 panel, induction heater 9 drops to lower edge distance strip steel 14 upper surface and sets heating distance, and induction heater 9 stops declining；Press PLC and control heating starting button on operating board 12 panel, infrared temperature probe 10 monitors heat treatment temperature, after reaching desired temperature, insulation, reaches to set heat treatment time, presses heating stop button, crawl rising button, induction heater 9 rises to below elevating mechanism 6 stroke extreme higher position 15mm to be stopped, and induction heater 9 rises 150mm～200mm, completes whole weld seam heat treatment step.Unclamp clamp system 16, after strip steel 14 tensioning, strip steel 14 is promoted 80mm～100mm, then sends production line startup order, it is achieved pickling milling train continuous rolling.
If selection automatic mode, high-carbon high-strength steel is carried out weld seam heat treatment, then heat treatment step operation is just simple, after laser welder 2 completes weld seam welding and operative employee determines input weld seam heat treatment process parameter, only need to press automatic startup, start automatic heating to process, same steel grade, stack pile blank strip steel 14, same heating-up temperature is set, heat time heating time, induction heater 9 drops to the heating distance of lower edge distance strip steel 14 upper surface, select return-to-zero-time and 2000 pulses per minute speed of elevating mechanism 6 automatic lifting, induction heater 9 declines automatically, heating, automatically rise after completing heat treatment, zero, operative employee checks and sends initial line order, realize pickling milling train continuous rolling.When the steel grade produced, thickness change, click SR, reset weld seam heat treatment process parameter, the automatic weld seam heat treatment of next batch can be carried out.
According to the concrete case of above-mentioned steps in Table 1.
Table 1 different steel grade, thickness blank heat treatment process parameter
This utility model one high-carbon high-strength steel cold continuous rolling weld seam annealing device and weld seam Technology for Heating Processing change because high-carbon high-strength steel weld joint 15 heat treatment time is not enough, temperature is inadequate, the welding drawbacks such as the welding stress that heat treatment is insufficient etc. causes can not eliminate, can according to different phosphorus content, intensity, raw thickness specification sets weld seam treatment temperature, time, welded seam area structure is made to change, metallographic structure is more uniform, improve high-carbon high-strength steel welding performance, ensure that welding quality, meet high-carbon high-strength steel and produce welding process requirement, achieve minimizing high-strength steel high-carbon steel weld seam broken belt rate, improve yield and lumber recovery during machine.By PLC control station 12 touch screen setup parameter, operating objective interface, show eye-catching, a key is clicked can complete whole technological action program, simple and convenient.Weld seam 15 heat treatment time is accurate to the second, makes thermal effectiveness reliably effective, and broken belt rate, below 1%, improves yield 30～35% during machine, improves high-carbon high-strength steel lumber recovery 2%, can ensure that the normal production at cold rolling coupled pickling and tandem mill of the high-carbon high-strength steel.
This utility model high-carbon high-strength steel cold continuous rolling weld seam annealing device adopts the model that Angus group (Hong Kong) Shenzhen Machinery Co., Ltd. produces to be CS-5 kind of refrigeration cycle water cooling system 11, the IT-6 infrared temperature probe that Wuhan company of Di Kai Electro-optical Technology, INC. (US) 62 Martin Road, Concord, Massachusetts 017 produces, the superaudio switch board 3 of selection, superaudio transformator 8, induction heater 9 are public technology international, domestic, all can find pertinent literature and manufacturing firm in the Internet.Ball screw adds the technology that the precision drive of motor is open maturation, also can find pertinent literature and manufacturing firm in the Internet.
Final statement: this utility model protection domain is not limited thereto, is equal to replacement according to the technical solution of the utility model and inventive concept thereof or is changed, all should be encompassed within protection domain of the present utility model.
Claims (6)
1. a high-carbon high-strength steel cold continuous rolling weld seam annealing device, including C shape travelling car, laser welder, superaudio switch board, operation performs cabinet, support bracket, elevating mechanism, traversing carriage, superaudio transformator, induction heater, infrared temperature probe, chilled water circulating cooling system, PLC controls operating board, bolt, cable, it is characterized in that, superaudio switch board, operation performs cabinet and is fixed on C shape travelling car platform, the input of superaudio switch board is connected with power supply by cable, the input that outfan performs cabinet by cable with operation is connected；Operation is performed another input of cabinet and is connected with the PLC outfan controlling operating board by cable, and three outfans are connected with elevating mechanism, superaudio transformator, chilled water circulating cooling system respectively by cable；In the upper surface of C shape travelling car, it is connected with support bracket, support is vertically installed with guide rail；With the fixing elevating mechanism of bolt on support bracket；One traversing carriage, the contiguous block in the middle of its side is fixing with the nut seat on elevating mechanism to be connected, and the connector on both sides is flexibly connected with the guide rail on support bracket；Crosspiece is fixed with the infrared temperature probe being connected with power supply, superaudio transformator fixed above, the lower section fixing induction heater of bolt in the middle of traversing carriage, is connected by cable between superaudio transformator and induction heater；One chilled water circulating cooling system, is connected with the intake-outlet of superaudio transformator, induction heater respectively by pipeline.
2. a kind of high-carbon high-strength steel cold continuous rolling weld seam annealing device according to claim 1, it is characterised in that described elevating mechanism is made up of motor, shaft coupling, ball screw, nut seat, a bearing.
3. a kind of high-carbon high-strength steel cold continuous rolling weld seam annealing device according to claim 1, it is characterised in that the connector on described traversing carriage both sides is the concave shaped groove with seam.
4. a kind of high-carbon high-strength steel cold continuous rolling weld seam annealing device according to claim 1, it is characterised in that described induction heater is made up of rectangle pipe fitting, ferrite and insulator.
5. a kind of high-carbon high-strength steel cold continuous rolling weld seam annealing device according to claim 4, it is characterised in that described ferrite is concave shaped cuboid block.
6. a kind of high-carbon high-strength steel cold continuous rolling weld seam annealing device according to claim 1, it is characterised in that described chilled water circulating cooling system is made up of refrigeration machine, water tank, inlet and outlet pipe lines.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201521071961.8U CN205368452U (en) | 2015-12-20 | 2015-12-20 | Cold tandem rolling welding seam heat treatment device of high -carbon high -strength steel |
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| CN201521071961.8U CN205368452U (en) | 2015-12-20 | 2015-12-20 | Cold tandem rolling welding seam heat treatment device of high -carbon high -strength steel |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105463177A (en) * | 2015-12-20 | 2016-04-06 | 新余钢铁集团有限公司 | Heat treatment device for high-carbon high-strength steel cold continuous rolling weld joint and heat treatment process for weld joint |
| CN106884086A (en) * | 2017-02-17 | 2017-06-23 | 燕山大学 | The device and technique of a kind of bilateral flame heating removal submerged arc pipe weld residual stress |
| CN114178777A (en) * | 2021-12-14 | 2022-03-15 | 大连理工大学 | Bolt rolling strengthening equipment and tool setting method thereof |
-
2015
- 2015-12-20 CN CN201521071961.8U patent/CN205368452U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105463177A (en) * | 2015-12-20 | 2016-04-06 | 新余钢铁集团有限公司 | Heat treatment device for high-carbon high-strength steel cold continuous rolling weld joint and heat treatment process for weld joint |
| CN106884086A (en) * | 2017-02-17 | 2017-06-23 | 燕山大学 | The device and technique of a kind of bilateral flame heating removal submerged arc pipe weld residual stress |
| CN106884086B (en) * | 2017-02-17 | 2018-04-03 | 燕山大学 | A kind of bilateral flame heating removes the device and technique of submerged arc pipe weld residual stress |
| CN114178777A (en) * | 2021-12-14 | 2022-03-15 | 大连理工大学 | Bolt rolling strengthening equipment and tool setting method thereof |
| CN114178777B (en) * | 2021-12-14 | 2023-03-28 | 大连理工大学 | Bolt rolling strengthening equipment and tool setting method thereof |
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