CN105081019A - Roll-bending process apparatus and roll-bending process method - Google Patents
Roll-bending process apparatus and roll-bending process method Download PDFInfo
- Publication number
- CN105081019A CN105081019A CN201510217346.1A CN201510217346A CN105081019A CN 105081019 A CN105081019 A CN 105081019A CN 201510217346 A CN201510217346 A CN 201510217346A CN 105081019 A CN105081019 A CN 105081019A
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- roll
- roller
- pushed amount
- bend
- promotion roller
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- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000013000 roll bending Methods 0.000 title abstract description 12
- 230000008569 process Effects 0.000 title abstract description 6
- 238000005452 bending Methods 0.000 claims description 30
- 230000015572 biosynthetic process Effects 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 230000001737 promoting effect Effects 0.000 description 24
- 238000004519 manufacturing process Methods 0.000 description 13
- 238000010586 diagram Methods 0.000 description 6
- 230000003584 silencer Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 241001529559 Rhipidura Species 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
- B21D5/14—Bending sheet metal along straight lines, e.g. to form simple curves by passing between rollers
-
- 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
- B21C37/15—Making tubes of special shape; Making tube fittings
- B21C37/16—Making tubes with varying diameter in longitudinal direction
- B21C37/18—Making tubes with varying diameter in longitudinal direction conical tubes
- B21C37/185—Making tubes with varying diameter in longitudinal direction conical tubes starting from sheet material
Abstract
A roll-bending process apparatus (100) including a pushing roll (10) having a cylindrical side surface and two receiving rolls (11 and 12) each having a cylindrical side surface is provided. The roll-bending process apparatus (100) bends a work (20) by pushing the pushing roll (10) toward the receiving rolls (11 and 12). The roll-bending process apparatus (100) forms a taper-shaped bending-formed article by adjusting a pushing amount of the pushing roll (10) so that a first pushing amount on one end side (10a) of the pushing roll (10) is different from a second pushing amount on the other end side (10b) of the pushing roll (10).
Description
Technical field
The present invention relates to roll and bend forming device and roll and bend forming method.Especially, the present invention relates to the roll and bend forming device for the formation of the bending forming goods with tapered shape and roll and bend forming method.
Background technology
The bending forming goods with tapered shape are manufactured by making the plate material with trapezoidal shape or fantail shape bend.Make to use such as roll and bend forming device in the bending process of plate material.
Such as, Japanese uncensored special permission application publication No.2012-236207 discloses the roll and bend forming device comprising three conical butt rollers.Fig. 6 shows the roll and bend forming device 600 of the example as this device.Promotion roller 60 is being pushed to accepted roll 61 and 62 and is thus making plate workpiece 70 bend form tapered tubular molded article while promotion roller 60 and accepted roll 61 and 62 by making roughly trapezoidal plate workpiece 70 by roll and bend forming device 600.
Be to be noted that promote the actuating length that roller 60 promotes workpiece 70 is constant on the longitudinal direction promoting roller 60.Such as, the actuating length promoting the 60a place, one end of roller 60 is substantially equal to the actuating length at the other end 60b place promoting roller 60.When workpiece 70 through promotion roller 60 and accepted roll 61 and 62 time, at one end 60a side is through roller for the upper bottom portion 71 of workpiece 70, and the lower bottom part 72 of workpiece 70 is other end 60b side is through these rollers.Therefore, workpiece 70 is bent to meet the side surface promoting roller 60.Promote the shape that roller 60 has convergent as follows: promote roller 60 and narrow towards 60a side, one end from other end 60b side.Therefore, the side surface promoting roller 60 tilts.Therefore, lower bottom part 72, to be less than the curvature bending of the curvature of upper bottom portion 71, therefore makes it possible to obtain the tapered tubular molded article with predetermined taper angle.
Summary of the invention
The present inventor has been found that following problem.In some cases, expect to obtain the bending forming goods with different taper angle.For these situations, roll and bend forming device disclosed in Japanese uncensored special permission application publication No.2012-236207 can form the tapered tubular molded article with different taper angle by roller being changed into other conical butt rollers with different taper angle.But, need to prepare multiple conical butt roller with different taper angle according to the taper angle of the tapered tubular molded article that will be formed.
In addition, compared with the structure of cylindrical roller, conical butt roller has complicated structure.In addition, conical butt roller does not use widely, is not therefore general roller.Therefore, the conical butt roller preparing to have multiple types of different taper angle needs high equipment cost.
Therefore, this roll and bend forming device and this roll and bend forming method in view of situation described above proposes the present invention, and the object of this invention is to provide following roll and bend forming device and roll and bend forming method: even if still can form the bending forming goods with different taper angle when these apparatus and method have universal architecture.
First illustrative aspects of the present invention is roll and bend forming device, and this roll and bend forming device comprises:
Promote roller, this promotion roller has cylindrical side; And
Two accepted rolls, each accepted roll has cylindrical side, wherein,
Roll and bend forming device makes workpiece bows by pushing promotion roller to accepted roll, and
Roll and bend forming device by regulate promote roller pushed amount with make promote roller end side on the first pushed amount (pushed amount on such as one end 10a side) be different from promote roller another side on the second pushed amount (pushed amount on such as other end 10b side) form tapered bending forming goods.
Configuration described above makes it possible to the pushed amount promoted in the end side of roller to change into the pushed amount different from the pushed amount on another side promoting roller.Therefore, even if device has the universal architecture comprising three rollers separately with cylindrical side, the bending forming goods with different taper angle can still be formed.
In addition, in tapered bending forming goods, when have compared with the part (such as upper bottom portion 21) of deep camber be arranged in promote roller end side and have compared with small curve part (such as, lower bottom part 22) be arranged in when promoting another side of roller, the first pushed amount can be greater than the second pushed amount.In addition, when formation has the bending forming goods of different taper angle, the combination of the first pushed amount and the second pushed amount can be changed.
Even if configuration described above makes still to form the bending forming goods with multiple taper angle when this device has universal architecture.
Another illustrative aspects of the present invention is the roll and bend forming method using the promotion roller with cylindrical side and two accepted rolls separately with cylindrical side, this roll and bend forming method is used for making workpiece bows by pushing promotion roller to accepted roll, and this roll and bend forming method comprises:
By regulate promote roller pushed amount with make promote roller end side on the first pushed amount be different from promote roller another side on the second pushed amount form tapered bending forming goods.
Configuration described above makes it possible to the pushed amount promoted in the end side of roller to change into the pushed amount different from the pushed amount on another side promoting roller.Therefore, even if use the universal architecture comprising three rollers separately with cylindrical side, the bending forming goods with different taper angle can still be formed.
In addition, in tapered bending forming goods, when have be arranged in compared with the part of deep camber the end side that promotes roller and have compared with the part of small curve be arranged in promote another side of roller time, the first pushed amount can be greater than the second pushed amount.In addition, when formation has the bending forming goods of different taper angle, the combination of the first pushed amount and the second pushed amount can be changed.
Even if configuration described above makes still can form the bending forming goods with multiple taper angle when using and having the roller of universal architecture.
In addition, workpiece can be the trapezoidal plate comprising upper bottom portion and lower bottom part, and this upper bottom portion forms the part had compared with deep camber of bending forming goods, and this lower bottom part forms the part had compared with small curve of bending forming goods, and lower bottom part is longer than upper bottom portion.In addition, lower bottom part can be bent with predetermined curvature by carrying out promoting on another side promoting roller, and upper bottom portion can be made by carrying out promoting in the end side promoting roller to bend with the predetermined curvature being greater than the predetermined curvature of lower bottom part.
Even if configuration described above makes still can form the tapered tubular molded article with multiple taper angle when using and having the roller of universal architecture.
This roll and bend forming device and this roll and bend forming method according to the present invention, roll and bend forming device and roll and bend forming method can be provided, even if still can form the tapered tubular molded article with multiple taper angle when these apparatus and method have universal architecture.
According to the detailed description hereinafter provided and the accompanying drawing only illustratively provided, above-mentioned and other objects of the present invention, feature and advantage will be more fully understood, and therefore not be considered to limitation of the present invention.
Accompanying drawing explanation
Fig. 1 is the schematic diagram according to an operation in the manufacture method of the first illustrative embodiments;
Fig. 2 is the schematic diagram according to an operation in the manufacture method of the first illustrative embodiments;
Fig. 3 shows the curve map of the curvature about pushed amount;
Fig. 4 is the schematic diagram according to an operation in the manufacture method of the first illustrative embodiments;
Fig. 5 is the stereogram of secondary silencer; And
Fig. 6 is the schematic diagram of an operation in the manufacture method in correlation technique.
Detailed description of the invention
First illustrative embodiments
Set forth according to the manufacture method of the first illustrative embodiments referring to figs. 1 through Fig. 4.Fig. 1, Fig. 2 and Fig. 4 are the schematic diagrames according to an operation in the manufacture method of the first illustrative embodiments.Fig. 3 shows the curve map of the curvature about pushed amount.Being to be noted that in fig. 2, eliminating the diagram of bearing block 13 and 14 and hydraulic cylinder 16 and 17 in order to make accompanying drawing know.
First, set forth according to the manufacturing installation used in the manufacture method of the first illustrative embodiments.As shown in fig. 1, roll and bend forming device 100 comprises promotion roller 10, accepted roll 11 and 12, bearing block 13 and 14 and hydraulic cylinder 16 and 17.
Promote roller 10 to be bearing in bearing block 13 and 14 by axle body 15 and to be to enclose the cylinder rotated about the axis.Promote the sidewall surfaces (also referred to as " cylindrical side ") of roller 10 and its axis being parallel.That is, promote roller 10 and not there is tapered shape and its taper angle is roughly 0 °.Promote roller 10 to be raised by hydraulic cylinder 16 and 17 by bearing block 13 and 14 and axle body 15/reduce.Such as, promote roller 10 to reduce towards accepted roll 11 and 12.
Accepted roll 11 and 12 to be bearing on support pedestals (not shown) by corresponding axle body (not shown) and to be to enclose the cylinder rotated about the axis.Similar with the sidewall surfaces promoting roller 10, sidewall surfaces (also referred to as " cylindrical side ") and its axis being parallel of accepted roll 11 and 12.That is, accepted roll 11 and 12 does not have tapered shape and its taper angle is roughly 0 °.Accepted roll 11 and 12 is arranged so that accepted roll 11 and 12 is parallel to each other in the mode between them with predetermined gap.Accepted roll 11 and 12 is fixed to make its axis be positioned at pre-position.
Bearing block 13 is arranged in the other end 10b side promoting roller 10, and bearing block 14 is arranged in the 10a side, one end promoting roller 10.In addition, bearing block 13 and 14 is supported by hydraulic cylinder 16 and 17 respectively, thus bearing block 13 and 14 can be raised/reduce.
Hydraulic cylinder 16 and 17 is separately positioned on below bearing block 13 and 14.Hydraulic cylinder 16 regulates the pushed amount on the other end 10b side promoting roller 10 by bearing block 13, and hydraulic cylinder 17 regulates the pushed amount on the 10a side, one end promoting roller 10 by bearing block 14.Hydraulic cylinder 16 and 17 can regulate its respective pushed amount, thus the actuating length promoting the other end 10b side of roller 10 is different from each other with the actuating length of the 10a side, one end promoting roller 10.Hydraulic cylinder 17 has the output higher than hydraulic cylinder 16, thus hydraulic cylinder 17 can realize the pushed amount larger than the pushed amount of hydraulic cylinder 16.Hydraulic cylinder 16 and 17 can regulate pushed amount by such as using the hydraulic flow of hydraulic control unit 18 hydraulic control cylinder 16 and 17.
Next, set forth according to the manufacture method of the first illustrative embodiments.As shown in Figures 1 and 2, by making trapezoidal plate workpiece 20 perform roll bending operation (roll bending operation S1) through promotion roller 10 and accepted roll 11 and 12 while pushing promotion roller 10 to accepted roll 11 and 12.Workpiece 20 is the trapezoidal plates be made up of the material that can bear roll bending operation.The example can bearing the material of roll bending operation comprises metal material, such as stainless steel.Workpiece 20 comprises: corresponding to the upper bottom portion 21 of trapezoidal upper base, corresponding to the trapezoidal lower bottom part 22 of going to the bottom and the side portion 23 and 24 corresponding to trapezoidal side.In trapezoidal, lower bottom part 22 is the side longer than upper bottom portion 21.
Usually, roll bending operation be executed as make the upper bottom portion 21 of workpiece 20 through the gap on 10a side, one end and the lower bottom part 22 of workpiece 20 through the gap on other end 10b side.When workpiece 20 is through when promoting roller 10 and accepted roll 11 and 12, promote roller 10 be lowered, make promote roller 10 10a side, one end on pushed amount (also referred to as " the first pushed amount ") be greater than promote roller 10 other end 10b side on pushed amount (also referred to as " the second pushed amount ").Be to be noted that as shown in Figure 3, although according to circumstances different, the curvature R of the bending forming goods formed by roll and bend forming device is such as proportional with the pushed amount L promoting roller.In this case, due to upper bottom portion 21 by promote the reduction of roller 10 be pushed into 10a side, one end---pushed amount on 10a side, this one end is greater than the pushed amount on other end 10b side---gap in, therefore upper bottom portion 21 is pushed with the pushed amount that the pushed amount of the lower bottom part 22 than the gap through other end 10b side is larger.Therefore, upper bottom portion 21 is with the curvature bending larger than the curvature of lower bottom part 22.Therefore, the curvature of upper bottom portion 21 is greater than the curvature of lower bottom part 22.Workpiece 20 is bending till side portion 23 and 24 toward each other continuously.Therefore, as shown in Figure 4, workpiece 20 is formed as the tapered tubular molded article (also referred to as " bending forming goods ") with predetermined taper angle.Upper bottom portion 21 becomes one end of tapered tubular molded article and lower bottom part 22 becomes its other end.
In this roll bending operation S1, ratio between the curvature of upper bottom portion 21 and the curvature of lower bottom part 22 can be changed in many ways by changing pushed amount on the 10a side, one end promoting roller 10 and the combination of pushed amount promoted on the other end 10b side of roller 10.Therefore, the taper angle (Fig. 4) of the tapered tubular molded article formed by workpiece 20 can be changed.The taper angle of this tapered tubular molded article is the angle of wall body relative to axis Y0.
Be to be noted that if necessary, the side portion 23 and 24 of workpiece 20 can be welded to one another (welding sequence S2).By side portion 23 and 24 being welded to one another, the tapered tubular molded article not having crack (or not having seam) in circumferential direction can be formed.
As mentioned above, according to the manufacture method according to the first illustrative embodiments, tapered tubular molded article can be formed.According in the manufacture method of the first illustrative embodiments, use the roll and bend forming device with universal architecture, namely comprise the roll and bend forming device of cylindrical promotion roller and cylindrical accepted roll.In addition, the pushed amount in the end side promoting roller and the pushed amount on its another side can be regulated by using hydraulic cylinder etc.Make it possible to manufacture the tapered tubular molded article with different taper angle like this.
Mentioning by way of parenthesis, such as can obtain secondary silencer by the flow path tube etc. that the diameter performed for making one or more ends of the tapered tubular molded article of acquisition shrink reduces operation, arrange the flow path being used as exhaust.Fig. 5 shows the secondary silencer 200 of the example as this secondary silencer.Secondary silencer 200 comprises: the tapered tubular central portion 29 with taper angle, for the flow path tube 30 making exhaust flow into central section 29 and flow out from central section 29, extend from one end of central section 29 and be connected to one end 27 of flow path tube 30 and extend from the other end of central section 29 and be connected to the other end 28 of flow path tube 30.The object that one end 27, the other end 28 and central section 29 are integrated and obtaining (see Fig. 4) by performing diameter reduction operation to one end (upper bottom portion 21) of tapered tubular molded article and the other end (lower bottom part 22).
Be to be noted that the present invention is not limited to the first illustrative embodiments described above, and can modify to the present invention when not deviating from the spirit and scope of the present invention as required.Such as, another roller relative with promoting roller 10 being positioned at accepted roll 11 and 12 sides can also be comprised according to the roll and bend forming device of the first illustrative embodiments.In addition, although use hydraulic cylinder 16 and 17 to promote roller according to the roll and bend forming device of the first illustrative embodiments, the actuator except hydraulic cylinder can also be used.The example of this actuator comprises hydraulic motor.In addition, although using trapezoidal plate workpiece according in the manufacture method of the first illustrative embodiments, also planar fan workpiece can used in other embodiments.In addition, although workpiece 20 only passes once between promotion roller 10 and accepted roll 11 and 12 in roll bending operation S1, it can repeatedly through promotion roller 10 and accepted roll 11 and 12.
According to described the present invention, it is evident that embodiments of the present invention can change in many ways.These modification are not considered to deviate from the spirit and scope of the present invention, and apparent all such modifications are intended to comprise within the scope of the appended claims to those skilled in the art.
Claims (7)
1. a roll and bend forming device, comprising:
Promote roller, described promotion roller has cylindrical side; And
Two accepted rolls, described two accepted rolls have cylindrical side separately, wherein,
Described roll and bend forming device makes workpiece bows by pushing described promotion roller to described accepted roll, and
Described roll and bend forming device forms tapered bending forming goods by the second pushed amount regulating the pushed amount of described promotion roller and to be different from another side of described promotion roller with the first pushed amount of the end side making described promotion roller.
2. roll and bend forming device according to claim 1, wherein, in described tapered bending forming goods, when have compared with the part of deep camber be arranged in described promotion roller described end side and have be arranged in another side described in described promotion roller compared with the part of small curve time, described first pushed amount is greater than described second pushed amount.
3. roll and bend forming device according to claim 1 and 2, wherein, when formation has the bending forming goods of different taper angle, changes the combination of described first pushed amount and described second pushed amount.
4. a roll and bend forming method, described roll and bend forming method uses to be had the promotion roller of cylindrical side and has two accepted rolls of cylindrical side separately, described roll and bend forming method is used for making workpiece bows by pushing described promotion roller to described accepted roll, and described roll and bend forming method comprises:
Tapered bending forming goods are formed by the second pushed amount regulating the pushed amount of described promotion roller to be different from another side of described promotion roller with the first pushed amount of the end side making described promotion roller.
5. roll and bend forming method according to claim 4, wherein, in described tapered bending forming goods, when have compared with the part of deep camber be arranged in described promotion roller described end side and have be arranged in another side described in described promotion roller compared with the part of small curve time, described first pushed amount is greater than described second pushed amount.
6. the roll and bend forming method according to claim 4 or 5, wherein, when formation has the bending forming goods of different taper angle, changes the combination of described first pushed amount and described second pushed amount.
7. the roll and bend forming method according to any one of claim 4 to 6, wherein,
Described workpiece is the trapezoidal plate comprising upper bottom portion and lower bottom part, described upper bottom portion forms the part had compared with deep camber of described bending forming goods, described lower bottom part forms the part had compared with small curve of described bending forming goods, and described lower bottom part is longer than described upper bottom portion, and
Made described lower bottom part bend with predetermined curvature by the promotion of another side described in described promotion roller, and
Made described upper bottom portion bend with the predetermined curvature larger than the predetermined curvature of described lower bottom part by the promotion of the described end side of described promotion roller.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2014-097772 | 2014-05-09 | ||
| JP2014097772A JP2015213944A (en) | 2014-05-09 | 2014-05-09 | Roll bending processor and roll bending processing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105081019A true CN105081019A (en) | 2015-11-25 |
Family
ID=53189631
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510217346.1A Pending CN105081019A (en) | 2014-05-09 | 2015-04-30 | Roll-bending process apparatus and roll-bending process method |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20150321236A1 (en) |
| EP (1) | EP2942120A1 (en) |
| JP (1) | JP2015213944A (en) |
| CN (1) | CN105081019A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112139314A (en) * | 2020-10-27 | 2020-12-29 | 东风佛吉亚排气控制技术有限公司 | Rolling machine is used in blast pipe production |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6056781B2 (en) * | 2013-04-10 | 2017-01-11 | トヨタ自動車株式会社 | Muffler manufacturing method and muffler |
| KR102185523B1 (en) * | 2020-06-22 | 2020-12-02 | 김인철 | the method nanufacturing storeag tank |
| KR102174742B1 (en) * | 2020-06-22 | 2020-11-05 | 김광철 | roll bending machine |
| CN114850258A (en) * | 2022-04-29 | 2022-08-05 | 南通超力卷板机制造有限公司 | High-precision numerical control centrum four-axis roll bending forming machine |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2674294A (en) * | 1953-02-19 | 1954-04-06 | Broderna Ekbergs Platslagerifa | Plate bending machine |
| CH384513A (en) * | 1959-11-16 | 1964-11-30 | Ferranti Albino | Calender for bending sheets |
| JPS5225389B2 (en) * | 1972-02-29 | 1977-07-07 | ||
| US4047411A (en) * | 1977-01-03 | 1977-09-13 | The Boeing Company | Numerically controlled pyramid roll forming machine |
| JP3621957B2 (en) * | 1995-10-04 | 2005-02-23 | 神埼工業株式会社 | Conical bending roll |
| JP2000033426A (en) * | 1998-07-17 | 2000-02-02 | Isel Co Ltd | Roll bending method and device therefor |
| JP5627005B2 (en) | 2011-05-11 | 2014-11-19 | 株式会社栗本鐵工所 | Bending roll device |
-
2014
- 2014-05-09 JP JP2014097772A patent/JP2015213944A/en not_active Withdrawn
-
2015
- 2015-04-29 US US14/699,215 patent/US20150321236A1/en not_active Abandoned
- 2015-04-30 CN CN201510217346.1A patent/CN105081019A/en active Pending
- 2015-05-07 EP EP15166702.9A patent/EP2942120A1/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112139314A (en) * | 2020-10-27 | 2020-12-29 | 东风佛吉亚排气控制技术有限公司 | Rolling machine is used in blast pipe production |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2015213944A (en) | 2015-12-03 |
| US20150321236A1 (en) | 2015-11-12 |
| EP2942120A1 (en) | 2015-11-11 |
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Application publication date: 20151125 |