CN105107866A - Thermal shaping method and device of high-strength sharp-corner square rectangular tube - Google Patents
Thermal shaping method and device of high-strength sharp-corner square rectangular tube Download PDFInfo
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- CN105107866A CN105107866A CN201510437941.6A CN201510437941A CN105107866A CN 105107866 A CN105107866 A CN 105107866A CN 201510437941 A CN201510437941 A CN 201510437941A CN 105107866 A CN105107866 A CN 105107866A
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- rectangular pipe
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- 238000007493 shaping process Methods 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 25
- 230000006698 induction Effects 0.000 claims abstract description 23
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 14
- 239000010959 steel Substances 0.000 claims abstract description 14
- 238000005452 bending Methods 0.000 claims abstract description 11
- 238000010438 heat treatment Methods 0.000 claims abstract description 9
- 238000000429 assembly Methods 0.000 claims description 9
- 230000000712 assembly Effects 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 7
- 239000002918 waste heat Substances 0.000 claims description 7
- 235000011499 Ferocactus hamatacanthus Nutrition 0.000 claims description 6
- 244000154165 Ferocactus hamatacanthus Species 0.000 claims description 6
- 210000000481 breast Anatomy 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 3
- 238000005336 cracking Methods 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000009966 trimming Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000004044 response Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 238000005482 strain hardening Methods 0.000 description 3
- 238000001192 hot extrusion Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000002407 reforming Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/065—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes starting from a specific blank, e.g. tailored blank
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B19/00—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work
- B21B19/02—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work the axes of the rollers being arranged essentially diagonally to the axis of the work, e.g. "cross" tube-rolling ; Diescher mills, Stiefel disc piercers or Stiefel rotary piercers
- B21B19/06—Rolling hollow basic material, e.g. Assel mills
- B21B19/10—Finishing, e.g. smoothing, sizing, reeling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/78—Control of tube rolling
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
The invention relates to a thermal shaping method and device of a high-strength sharp-corner square rectangular tube. The method comprises the following steps: pre-bending a high-strength steel plate into a pre-shaped square rectangular tube whose corner radius R is 4-10mm by using a cold bending shaping method, sending the pre-shaped square rectangular tube into an induction heating coil and locally heating the four bend-corner parts of the pre-shaped square rectangular tube at the heating temperature of 500-1050 DEG C; after heating, sending the pre-shaped square rectangular tube into a first pass roller pass, extruding out a sharp-corner square rectangular tube; sending the sharp-corner square rectangular tube into a second shaping pass to perform the second thermal shaping and eliminate redundant deformation. The square rectangular tube with the inner sharp corners or outer sharp corners can be prepared, the residual stress on the corners is reduced, the elongation rate is increased, and cracking phenomenon caused by processing hardening is avoided.
Description
Technical field
The invention belongs to hot-pressed field, be specifically related to the hot shaping methods of a kind of high strength wedge angle square and rectangular pipe and device.
Background technology
High strength square and rectangular pipe is the shaped steel of remaining silent that a kind of purposes is extremely wide, compared with the pipe that same cross-sectional is long-pending, it has that intensity is high, module of anti-bending section is large, be easy to assembling and the advantage such as firm, attractive in appearance, be widely used in the industry such as vehicle, building, especially, in Bus Frame, building decoration, high strength square and rectangular pipe also becomes more and more compelling product in world's steel market.
Along with high strength square and rectangular pipe product consumption increases, also more and more higher to the intensity of square and rectangular pipe, size and fillet required precision, when high-strength steel or super-high strength steel draw roll o ing technique, square and rectangular pipe is produced and is run into various problem, as uneven in inside and outside bent angle and easily produce angle of collapsing; Percentage elongation obviously reduces; Its yield tensile ratio is high simultaneously, and namely shaping interval is relatively little, especially the shaping of sharp corner square rectangular tube, is easy to produce cracking.So, adopt conventional roll o ing explained hereafter high strength wedge angle square and rectangular pipe almost cannot complete.
Summary of the invention
The object of the present invention is to provide a kind of high-strength steel sharp corner square rectangular tube manufacturing process and device, localized heat shaping technique is introduced in reforming process, by induction coil, local induction heating is carried out to square and rectangular pipe four bent angles, eliminate corner residual stress concentrations phenomenon, improve the forming property of material; Avoid the cracking phenomena produced due to work hardening simultaneously.
For achieving the above object, technical scheme of the present invention is:
The hot shaping methods of a kind of high strength wedge angle square and rectangular pipe, comprises the following steps:
1) preform
Adopt cold bending method, high-strength steel sheet is pre-bent to the preform square and rectangular pipe of radius of corner R=4 ~ 10mm, the yield strength of described high-strength steel sheet is 600 ~ 1400MPa.
2) heat
Preform square and rectangular pipe enters load coil, and carry out local heat to four bent angle positions of preform square and rectangular pipe, heating-up temperature is 500 ~ 1050 DEG C.
3) the first passage shaping
After heating, preform square and rectangular pipe is sent in the first passage roll pass, squeeze out wedge angle type square and rectangular pipe; Described first passage roll is isometrical, and roll surface is provided with groove, and described first passage roll pass is made up of four rolls.
4) the second passage shaping
Wedge angle type square and rectangular pipe after finishing enters the second shaping passage, carries out the hot shaping of second time, eliminates redundancy distortion.
Further, step 3) the indent amount of the first passage roll surface upper groove is 0.1 ~ 0.5mm.
Again, when the interior angle of wedge angle type square and rectangular pipe is wedge angle, step 2) in heating-up temperature be 500 ~ 800 DEG C, preferably 500 ~ 750 DEG C; When the exterior angle of wedge angle type square and rectangular pipe is wedge angle, step 2) in heating-up temperature be 800 ~ 1050 DEG C.
When the exterior angle of wedge angle type square and rectangular pipe is wedge angle, after the second passage shaping, need cooling.
Again, step 4) in wedge angle type square and rectangular pipe enter the second shaping passage, the tension force effect utilizing the speed difference between turks-head roll principle, passage to produce and step 3) waste heat after the first hot-trimming passage, realize the hot shaping operation of second time to wedge angle type square and rectangular pipe, eliminate the redundancy distortion such as warpage, lateral bending, distortion.
Step 4) utilize the poor speed difference caused in the roller footpath of the first passage roll and the second shaping passage roll to produce tension force effect between two passages, wherein, the roller footpath difference of described first passage roll and the second shaping passage roll is 1 ~ 5mm.
Further, after described first passage shaping, waste heat supply temperature is 400 ~ 600 DEG C.
Wedge angle type square and rectangular pipe of the present invention comprises square and rectangular pipe that interior angle is wedge angle and exterior angle is the square and rectangular pipe of wedge angle, and interior angle is that the forming technology of the square and rectangular pipe of wedge angle chooses warm working, and forming temperature is 500 ~ 800 DEG C; Exterior angle is that the forming technology of the square and rectangular pipe of wedge angle chooses hot shaping, and forming temperature is 800 ~ 1050 DEG C.Wherein, in hot shaping process, process for cooling is water-cooled, the intensity of square and rectangular pipe after guarantee shaping.
Step 3 of the present invention) described first passage roll surface band is fluted, extruding force can be delivered to bent angle position, prevent in extrusion process, because the deformation drag of high temperature angle section is less, there is square and rectangular pipe edge indent phenomenon, be isometrical by Roller Design simultaneously, ensure that four-way pressure is consistent, obtain four consistent wedge angles.
Step 3) in, preform square and rectangular pipe is under the active force of the roll of band groove, bent angle position is subject to four-way extruding force, because bent angle position is subject to the impact of temperature, its yield strength is lower than not temperature influence or the very little mother metal of impact, extruding force is delivered to corner, and moulding deformation occurs, and forms wedge angle.Now, the stressed schematic diagram of square and rectangular pipe as shown in Figure 1.
Through step 3) after large deformation extruding, the fillet of square and rectangular pipe can be subject to residual stress heterogeneous, causes the redundancy such as distortion, lateral bending to be out of shape.The invention provides a kind of hot tensile strength system, its principle is, utilize the speed difference that the difference of the roller footpath between two passages causes, certain tension force effect is produced between two passages, again in conjunction with the waste heat after hot shaping, and turks-head roll principle efficiently solves the redundancy such as distortion, warpage deformation after hot-trimming, the stressed schematic diagram of square and rectangular pipe as shown in Figure 1.Specifically the roller footpath difference of first and second passage shaping is 1 ~ 5mm, guarantees that waste heat supply temperature scope is between 400 ~ 600 DEG C by passage spacing or feed speed.
The hot apparatus for shaping of high strength wedge angle square and rectangular pipe of the present invention, comprise feeding frame, guide roller successively, shaping frame, also comprises, at least one linear response heater coil, is arranged at described guide roller exit; Described shaping frame comprises two frames be arranged in series, and these two frames adopt turks-head roll open frame, and wherein, described first passage breast roller roll surface is provided with groove.
Further, the indent amount of described first passage breast roller roll surface upper groove is 0.1 ~ 0.5mm.
Preferably, described load coil comprises four induction coil assemblies, and four induction coil assemblies are in the rectangular-shaped arrangement in side, and the spacing of four induction coil assemblies is adjustable, make the size adjustable of the middle pass formed.
Preferably, the present invention includes four load coils, four load coils are in the rectangular-shaped arrangement in side, and the spacing of four induction coils is adjustable, make the interstitial hole molded dimension of formation adjustable.
Preferably, apparatus for shaping of the present invention also comprises the temperature measuring equipment and PID feedback control system that are connected with linear response heater coil.
The present invention carries out local heat by four induction coil assemblies in the rectangular-shaped arrangement in side or load coil to four of preform square and rectangular pipe bent angle positions, and other position is temperature influence or influenced very little not; And the power of induction heater is regulated by the temperature measuring equipment that is connected with induction heater and PID feedback control system, ensure the constant of temperature, stablely realize four bent angle homogeneous heatings.Wherein load coil interstitial hole molded dimension is adjustable, is applicable to the square and rectangular pipe bight heating of different specification size.
Beneficial effect of the present invention:
1. the present invention accurately can carry out local heat to four bent angle positions of square and rectangular pipe by induction coil, and it is unaffected to avoid other edge mother metals, thus reduce the intensity at rectangular tube bent angle position, improve the moulding deformation nature at bent angle position, obtain sharp corner square rectangular tube, and improve the work hardening phenomenon at bent angle position, improve its percentage elongation; And this induction coil firing rate is fast, the thermal efficiency is high, and cost is low.
2. the present invention first passage roll surface band is fluted, and extruding force is passed to bight, effectively prevents the recessed phenomenon of square tube plane from occurring.And propose to utilize the speed difference that causes of difference of the roller footpath between two passages to produce tension force effect between two passages, then solve the redundancy such as distortion, warpage deformation after hot-trimming well in conjunction with waste heat.
3. hot apparatus for shaping of the present invention as a module, when needing, can embed production line; When not needing, entirety removes, easy accessibility, quick; Low to the requirement of equipment plastic force, extend the life-span of equipment.
4. the present invention prepares the square and rectangular pipe with square corner or outer wedge angle, and its bight residual stress reduces, and percentage elongation raises, for the following process of high-strength steel square and rectangular pipe provides possibility.
Accompanying drawing explanation
Fig. 1 is the stressed schematic diagram of square and rectangular pipe of the present invention in reforming process.
Fig. 2 is the schematic flow sheet of the embodiment of the present invention.
Fig. 3 is the use schematic diagram of induction heater local heat square and rectangular pipe of the present invention.
Fig. 4 is that wedge angle that the present invention designs is shaped the structural representation of the first passage roll.
Fig. 5 is the structural representation of the embodiment of the present invention 1,2 preform square and rectangular pipe.
Fig. 6 is the structural representation of the embodiment of the present invention 1 square corner square and rectangular pipe product.
Fig. 7 is the structural representation of the embodiment of the present invention 2 outer sharp corner square rectangular tube product.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, the present invention will be further described.
See Fig. 2 ~ Fig. 4, the hot apparatus for shaping of high strength wedge angle square and rectangular pipe of the present invention, comprise feeding frame 1, guide roller 2 successively, shaping frame, also comprise, at least one linear response heater coil 3, and the temperature measuring equipment be connected with linear response heater coil and PID feedback control system 4, be arranged at described guide roller 2 exit; Described shaping frame comprises two frames 5 and 7 be arranged in series, and these two frames 5 and 7 adopt turks-head roll open frame, and wherein, described first passage breast roller 6 roll surface is provided with groove.
Load coil 3 described in the present embodiment comprises four induction coil assemblies 31,32,33,34, and four induction coil 31,32,33,34 unit are in the rectangular-shaped arrangement in side, and interstitial hole molded dimension is adjustable.
The hot shaping methods of high strength wedge angle square and rectangular pipe of the present invention, comprises the steps:
1) by traditional cold bending process, high-strength steel sheet is pre-bent to the larger rectangular tube of radius of corner, then enter feeding frame 1, in conjunction with guide roller 2, preform square and rectangular pipe is conveyed into induction coil 3 stably, prevent preform square and rectangular pipe and coil contact, destroy induction coil.
2) enter induction coil 3, local heat is carried out at four bent angle positions of four induction coil assemblies, 31,32,33,34 pairs of preform square and rectangular pipes, after being heated to preset temperature, ensures the constant of heating-up temperature by temperature measurer and PID feedback control system 4; Thereupon, enter frame 5, square and rectangular pipe is under the active force of the first passage roll 6 of band concave arc, bent angle position is subject to four-way extruding force, because fillet is subject to the impact of temperature, yield strength is lower than not temperature influence or the very little mother metal of impact, and extruding force is delivered to corner, there is moulding deformation, form wedge angle.
3) the wedge angle type square and rectangular pipe after the first hot-trimming passage enters frame 7, carry out the hot shaping of second time, utilize the speed difference that the difference of the roller footpath between two passages causes, certain tension force effect is produced between two passages, again in conjunction with the waste heat (400 ~ 600 DEG C) after hot shaping, and turks-head roll principle efficiently solves the redundancy such as distortion, warpage deformation after hot-trimming.
Embodiment 1
High-strength steel sheet (material is QSTE700) is pre-bent to the preform square and rectangular pipe (as shown in Figure 5) of radius of corner R=6mm, it is of a size of 40.0 × 40.0 × 2.0mm; 2) with feed speed 10m/min, preform square and rectangular pipe fillet position is heated to rapidly 600 DEG C; 3) after hot extrusion, shaping, obtain and be of a size of 38.0 × 38.0 × 2.0mm, square corner square and rectangular pipe, its structure as shown in Figure 6.
After testing, for QSTE700 material, during cold bending, percentage elongation only has 9%; And bent angle percentage elongation is returned to material performance after the hot shaping of the present embodiment, percentage elongation reaches 20%.
Embodiment 2
High-strength steel sheet (QSTE700 material) is pre-bent to the preform square and rectangular pipe (as shown in Figure 5) of radius of corner R=6mm, it is of a size of 40.0 × 40.0 × 2.0mm; 2) with feed speed 10m/min, preform square and rectangular pipe fillet position is heated to rapidly 800 DEG C; 3) after hot extrusion, shaping, obtain and be of a size of 37.5 × 37.5 × 2.0mm, outer sharp corner square rectangular tube, its structure as shown in Figure 7.
After testing, during cold bending, percentage elongation only has 5%; And bent angle percentage elongation is returned to material performance after the hot shaping of the present embodiment, percentage elongation reaches 18%.
In summary, compared with cold bending technique, square and rectangular pipe work hardening phenomenon of the present invention alleviates, and residual stress reduces, and percentage elongation is well improved.
The above is the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from principle of the present invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. the hot shaping methods of high strength wedge angle square and rectangular pipe, is characterized in that, comprise the steps:
1) preform
Adopt cold bending method, high-strength steel sheet is pre-bent to the preform square and rectangular pipe of radius of corner R=4 ~ 10mm, the yield strength of described high-strength steel sheet is 600 ~ 1400MPa;
2) heat
Utilize load coil to carry out local heat to four of preform square and rectangular pipe bent angle positions, heating-up temperature is 500 ~ 1050 DEG C;
3) the first passage shaping
After heating, preform square and rectangular pipe is sent in the first passage roll pass, squeeze out wedge angle type square and rectangular pipe; Described first passage roll is isometrical, and roll surface is provided with groove;
4) the second passage shaping
Wedge angle type square and rectangular pipe after finishing enters the second shaping passage, carries out the hot shaping of second time, eliminates redundancy distortion;
Wherein, the roller footpath difference of described first passage roll and the second shaping passage roll is 1 ~ 5mm.
2. the hot shaping methods of high strength wedge angle square and rectangular pipe according to claim 1, is characterized in that, step 3) the indent amount of the first passage roll surface upper groove is 0.1 ~ 0.5mm.
3. the hot shaping methods of high strength wedge angle square and rectangular pipe according to claim 1, is characterized in that, step 3) waste heat supply temperature is 400 ~ 600 DEG C after the first passage shaping.
4. the hot shaping methods of high strength wedge angle square and rectangular pipe according to claim 1, is characterized in that, when the interior angle of wedge angle type square and rectangular pipe is wedge angle, step 2) in heating-up temperature be 500 ~ 800 DEG C; When the exterior angle of wedge angle type square and rectangular pipe is wedge angle, step 2) in heating-up temperature be 800 ~ 1050 DEG C.
5. the hot shaping methods of high strength wedge angle square and rectangular pipe according to claim 1 or 4, is characterized in that, when the exterior angle of wedge angle type square and rectangular pipe is wedge angle, step 4) also comprise process for cooling after the second passage shaping.
6. the hot apparatus for shaping of high strength wedge angle square and rectangular pipe, comprises feeding frame, guide roller successively, and shaping frame, is characterized in that, also comprises,
At least one load coil, is arranged at described guide roller exit;
Described shaping frame comprises two frames be arranged in series, and these two frames adopt turks-head roll open frame, and wherein, described first passage breast roller roll surface is provided with groove.
7. the hot apparatus for shaping of high strength wedge angle square and rectangular pipe according to claim 6, it is characterized in that, described load coil comprises four induction coil assemblies, and described four induction coil assemblies are in the rectangular-shaped arrangement in side, and the spacing of four induction coil assemblies is adjustable.
8. the hot apparatus for shaping of high strength wedge angle square and rectangular pipe according to claim 6, is characterized in that, comprises four load coils, and described four load coils are in the rectangular-shaped arrangement in side, and the spacing of four induction coils is adjustable.
9. the hot apparatus for shaping of high strength wedge angle square and rectangular pipe according to claim 6, is characterized in that, the indent amount of described first passage breast roller roll surface upper groove is 0.1 ~ 0.5mm.
10. the hot apparatus for shaping of high strength wedge angle square and rectangular pipe according to claim 6 or 7 or 8, is characterized in that, also comprises the temperature measuring equipment and PID feedback control system that are connected with load coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510437941.6A CN105107866A (en) | 2015-07-23 | 2015-07-23 | Thermal shaping method and device of high-strength sharp-corner square rectangular tube |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510437941.6A CN105107866A (en) | 2015-07-23 | 2015-07-23 | Thermal shaping method and device of high-strength sharp-corner square rectangular tube |
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| CN201510437941.6A Pending CN105107866A (en) | 2015-07-23 | 2015-07-23 | Thermal shaping method and device of high-strength sharp-corner square rectangular tube |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108555091A (en) * | 2018-05-12 | 2018-09-21 | 通辽市亿隆科技有限公司 | Building iron template right angle squeezes rib machine |
| WO2020015555A1 (en) * | 2018-07-17 | 2020-01-23 | 欣诺冷弯型钢产业研究院（曹妃甸）有限公司 | Corner-thickened cold/hot composite formation square/rectangular pipe forming system |
| WO2020015557A1 (en) * | 2018-07-17 | 2020-01-23 | 欣诺冷弯型钢产业研究院（曹妃甸）有限公司 | Corner-thickened cold/hot composite formation square/rectangular steel pipe and preparation method therefor |
| CN111229860A (en) * | 2019-12-11 | 2020-06-05 | 江苏顺力冷弯型钢实业有限公司 | Method for forming vehicle sharp-corner square tube |
| CN112588818A (en) * | 2020-11-27 | 2021-04-02 | 中北大学 | Manufacturing method of large rectangular section with inner rib belt guide rail |
| CN112893458A (en) * | 2020-12-25 | 2021-06-04 | 广州众山精密科技有限公司 | Warm rolling process of stainless steel section |
| CN114522981A (en) * | 2022-02-24 | 2022-05-24 | 湖南湘投金天新材料有限公司 | Heating device for round tube square tube and processing system with same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112588818A (en) * | 2020-11-27 | 2021-04-02 | 中北大学 | Manufacturing method of large rectangular section with inner rib belt guide rail |
| CN112588818B (en) * | 2020-11-27 | 2023-01-24 | 中北大学 | Manufacturing method of large rectangular section with inner rib belt guide rail |
| CN112893458A (en) * | 2020-12-25 | 2021-06-04 | 广州众山精密科技有限公司 | Warm rolling process of stainless steel section |
| CN112893458B (en) * | 2020-12-25 | 2023-03-31 | 广州众山精密科技有限公司 | Warm rolling process for stainless steel section |
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Application publication date: 20151202 |