CN101068636A - Method for production of a seamless hot-finished steel tube and device for carrying out said method - Google Patents
Method for production of a seamless hot-finished steel tube and device for carrying out said method Download PDFInfo
- Publication number
- CN101068636A CN101068636A CN 200580041393 CN200580041393A CN101068636A CN 101068636 A CN101068636 A CN 101068636A CN 200580041393 CN200580041393 CN 200580041393 CN 200580041393 A CN200580041393 A CN 200580041393A CN 101068636 A CN101068636 A CN 101068636A
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- forming step
- tile fragment
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- 238000000034 method Methods 0.000 title claims description 81
- 238000004519 manufacturing process Methods 0.000 title claims description 23
- 229910000831 Steel Inorganic materials 0.000 title claims description 8
- 239000010959 steel Substances 0.000 title claims description 8
- 238000005242 forging Methods 0.000 claims description 54
- 239000012634 fragment Substances 0.000 claims description 21
- 238000005096 rolling process Methods 0.000 claims description 14
- 238000004080 punching Methods 0.000 claims description 11
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- 238000000227 grinding Methods 0.000 claims description 2
- 239000000314 lubricant Substances 0.000 claims description 2
- 238000003754 machining Methods 0.000 claims description 2
- 230000003647 oxidation Effects 0.000 claims 2
- 238000007254 oxidation reaction Methods 0.000 claims 2
- 239000007788 liquid Substances 0.000 abstract 3
- 238000010438 heat treatment Methods 0.000 description 11
- 238000009749 continuous casting Methods 0.000 description 6
- 238000012546 transfer Methods 0.000 description 4
- 230000002349 favourable effect Effects 0.000 description 3
- 238000003801 milling Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012857 repacking Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000009785 tube rolling Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 229910000754 Wrought iron Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
Disclosed is a speaker including a speaker enclosure having a liquid chamber to mount and enclose a speaker driver. The speaker enclosure includes a front mounting portion and a body portion. The front mounting portion has an opening to mount the speaker driver and the body portion extends rearwardly from the mounting portion and the speaker driver is enclosed by the front mounting portion and the body portion within an interior of the speaker enclosure. Particularly, the body portion includes a liquid chamber that may be filled with a liquid to affect the tuning of the speaker enclosure to enhance lower frequencies.
Description
Technical field
The present invention relates to a kind of method as described in the preamble according to claim 1 in order to make seamless hot-finished steel tube.
Background technology
Make the hollow pipe fitting of a heavy wall by the blank of a heating according to the invention of Br ü der Mannesmann, different suggestions is provided, this hollow pipe fitting is extended in another hot-working stage with identical temperature, to this keyword is continuous tube rolling method, usefulness push-bench rolling seamless steel pipe method, plug roll process and Pi Geershi pilger mill method (steel pipe handbook, the 10th edition, III. manufacture method, Vulkan publishing house, Essen 1986).
Whole described methods have its advantage for different size ranges and material, and intersection is wherein also arranged.Adopt continuously and the mandrel rolling method for 5 to 18 inches of medium size ranges, reach 26 inches for size range and adopt Pi Geershi pilger mill method.For the thicker wall in＞30mm scope continuously and the mandrel rolling method more or less be suitable for, though and Pi Geershi pilger mill method is out of question to wall thickness, be slowly aspect the manufacturing beat.The repacking time of disadvantageously when size change over, more or less growing in whole described methods.
Show that the feature by a blank manufacturing seamless pipe that heats is three step punching-extension-undergauges rolling (H.Biller: the problem that rolling-method of seamless pipe is selected, steel and iron 106 (1986) No.9,431-437 page or leaf).
People have attempted to save a step since long term, make and equipment cost so that reduce.So far effect is little in fact in these effort.
DE 1 908 961 A1 disclose a kind of method in order to make seamless pipe by the hollow body of making in continuous casting.In this known method, ingot casting is cut apart and extended each corresponding bulk-breaking in advance by an in-house tool and hot forge rolling.Then the bulk-breaking that will extend in advance is rolled into a prefabricated pipe (pipe) and produces a production tube by follow-up extension undergauge by it on a continuous rolling mill, and the method for this suggestion is intended using in a large amount of productions of the pipe of being made minor diameter in continuous casting by the hollow body of making.The problem of the strong load of cross roll when this suggestion should help to overcome pre-the extension.
Summary of the invention
The objective of the invention is, a kind of manufacture method that is used for seamless hot-finished steel tube is provided, and it is for the size range of 5 to 30 inches external diameters with for 5 to＜16 inches external diameter scope wall thickness 〉=0.1 * external diameters, for 16 to 30 inches external diameter scope wall thickness 〉=40mm, also more superior in the method than known aspect output and the productivity ratio for small lot batch manufacture.
This purpose reaches in conjunction with its characteristic according to the preamble of claim 1.Favourable further formation is the theme of all dependent claims.
In accordance with the teachings of the present invention, under the situation of using the forging tile fragment on the outer surface that at least two of inserting the in-house tool of hollow blank and a forging machine affact hollow blank, it is the forming step (extends rolling and undergauge rolling) of feature with rolling that forming step by a radial forging process form replaces the known so far the second and the 3rd, hollow blank is rotated in the stage of the idle stroke of forging tile fragment periodically and moves axially.According to the mode of control can be simultaneously or the time go up rotation and the axial advance that hollow blank is implemented on dislocation ground.
The advantage of the method for suggestion is that pipe and the repacking time that also can make heavy wall best are not long.Still can reach high progradation even be similar to the pipe in by the extension process of forging of Pi Geershi to very thick wall.Even therefore in the pipe of heavy wall, also can have big length of tube.
Another advantage can find out and be, the precision mill that connects after can saving under the overwhelming majority's the situation that other need is because have the production tube quality at the hot-rolled pipe of producing so later on by the extension process of forging.
The forging process of suggestion need not two with altogether four then be especially effectively with favourable qualitatively when forging tile fragments, they affact on the outer surface of hollow blank in a plane inter-sync.In order particularly to distribute thermic load better, can be advantageously, same direction or rightabout motion that in-house tool is advanced in forging process vertically.
Big percentage elongation (＞4) and little wall thickness (＜can be essential 30mm) time be before forging, in hollow blank, to apply the release agent and the lubricant of phosphate for example or graphite-based.The hollow blank of avoiding whereby forging takes place fixed on in-house tool.
First forming step selectively can be a punch process or a punching by means of cross roll.Cut off later on or dash and wear the bottom in punch process.Can realize cutting off via flame cutting or hot saw.Will by punch process or by means of the hollow blank that the punching of cross roll is produced it obtains its production tube size by forging before, can directly forge or by after the cross roll that connects extend in advance.
In this processing method, can cancel in punch process and cut off later on or dash and wear the bottom.Use a two roller machine or three-roller for cross roll.The oxide skin of removing outer surface and/or inner surface according to preliminary treatment is favourable.
The production tube that forges is at common calibration steps, as after customized cut-off, visual examination, the marking etc. or can deliver goods immediately or at first through heat-treated and/or undamaged test.Heat treatment can be normalizing or modified.Need to require calibration according to linearity.In corresponding delivery requirements, need comprehensive grinding or another suitable machining of outer surface equally, so that eliminate the little unevenness that causes because of forging process.
The part of an employed former blank or a continuous casting rod, a preferred continuous casting pole or an ingot casting (ingot).Under the situation that is difficult to plastic material, need continuous casting by preformed rolling or that forge according to the punch process of using.The heating of former blank is in the known manner in rotatable heating furnace on the one or realize in a walking beam furnace.Also can imagine other heating furnace, for example soaking pit for big weight.
The device of implementing this method is characterised in that a radial forging, and it has one and forges the forging tile fragment of frame and at least two replaceable settings therein.Rotatablely move and the axial advance of hollow blank realize at input side with at the manipulator of outlet side setting by each one.Reduce to minimum and proved advantageously for possible calibration is expended, at least at outlet side at manipulator and forge between the frame guide rail is set.This guarantees, the production tube that leaves the forging of forging frame is remained on the center line as far as possible.
It is possible utilizing the forging process of straight forging tile fragment in principle, is seeing when having the smooth that an intake section that narrows down gradually and is right after thereafter the decisive surface quality of improving towards the vertical section but forge watt to determine when each on the side of workpiece.See that towards the cross section entrance area has the curvature of a spill, wherein the radius in corresponding cross section is always greater than the radius of the reality of the hollow blank that is in interlocking.Avoid a pinch effect by the bigger curvature in the cross section.But needn't provide an independent forging tile fragment group for each input diameter of hollow blank, utilize one group of scope that just can cover a different input diameter on the contrary.
Interior diameter and interior profile are seen basically by the pattern of in-house tool, are preferably determined with the form of cylindrical plug along the length of the production tube that forges.
Insert a slight conical plug and increase the production tube of forging and the gap between the in-house tool, thereby be convenient to extract production tube out in the instrument internally.But it is small that tapering only allows, because otherwise changed wall thickness in unallowed mode along length.
One has the application of the plug of step can be advantageously used in the tubular axis of making the end with thickening.It also is possible making a plurality of tubular axis according to the mode of step by a hollow blank.Then each is separated.
The Another Application field is a screwed pipe of making the form that connects with integral body.In so-called insertion pipe, also there is possibility, promptly directly utilizes and treat that the sleeve pipe of forging welding replaces its independent manufacturing.
Description of drawings
View by two simplification illustrates in greater detail method of the present invention.Wherein:
Fig. 1 illustrates by method of the present invention, comprises a hole punched device (cross roll);
Fig. 2 illustrates by method of the present invention, comprises the pre-extension apparatus (elongating mill) that connects behind a hole punched device (cross roll) and;
Fig. 3 one is in the longitudinal section of the hollow blank of interlocking;
Fig. 4 is along the cutaway view of the A-A direction among Fig. 3.
The specific embodiment
Fig. 1 illustrates method of the present invention as the view of simplifying, and comprises that only a hole punched device is as first forming step.Exemplarily a blank 1 that is separated in the rod iron by continuous casting is packed in the single-revolution formula heating furnace 2 and be heated to for example 1250 ℃ of forming temperatures.Give a hole punched device with the blank of heating via a roller-way 3 in heating with after leaving swinging heating furnace 2.
In this embodiment hole punched device constitute comprise two cross rolls 5,5 ' cross roll milling train 4.One in-house tool belongs to this device, and it comprises a punching plug 6 and a fixed bar 7.Because by means of the cross roll punching is fully known, saves it is further specified in more detail.
Produce a hollow blank 8 by punching by blank 1, this hollow blank arrives forging machine 10 via a lateral transfer 9.The combination that the extension process of following by radial forging constitutes other the second and the 3rd common forming step according to the present invention replaces other general rolling, and they are to connect the undergauge roll after continuous tube rolling method, plug roll process or the Pi Geershi pilger mill method.
After the in-house tool 11 that moves into a pref. cylindrical mandrel form, hollow blank 8 is passed through a manipulator 13 in the input side setting rotate simultaneously along carrying also by forging frame 14.Such rotation and axial advance are realized in dislocation ground simultaneously or on the time on the stages period ground of the idle stroke of forging tile fragment.
At outlet side, a second operation machine 12 is accepted production tube 16 subsequently, so that can cause forging process to finish.Only simplify forging machine being shown and wherein having unshowned each forging tile fragment of rabbeting hollow blank 8 on every side among the figure, it affacts on the outer surface, so that extend hollow blank 8 by reduced outside diameter and wall thickness.
After by the extension process of forging, hot-rolled pipe 16 is input to finishing line by arrow 15, so that be ready to shipment there.Heat treatment and/or undamaged test that finishing generally includes customized cut-off, visual inspection, marking and at first implements on demand.Owing to the place reason, the hot-rolled pipe 16 that illustrates is shorter than its corresponding elongation.
Exemplarily make the hollow blank 8 of a size 390 external diameters * 123mm wall thickness and length 3.5m later in punching by that have a size 406mm circle and the blank 1 of length 2.8m by the process shown in Fig. 1.After forging, hot-rolled pipe 16 has external diameter and the wall thickness of 50mm and the length of 15m of 203mm.
Fig. 2 illustrates a flexible program by the method for Fig. 1, and wherein identical parts are selected identical Reference numeral.First forming step is identical up to making a hollow blank 8 with forming step illustrated in fig. 1.Before by the extension process of forging, second forming step is set, but still is a pre-extension apparatus, so-called elongating mill.Elongating mill also constitutes the cross roll milling train and comprises two cross rolls 18,18 ' and in-house tool in this embodiment, and it comprises that one is connected in the chock plug 19 of a fixed bar 20.
Leave the hollow blank 8 of hole punched device and supply with elongating mill 17 input sides via a lateral transfer 9.By cross roll pre-extend hollow blank 8 and make a hollow blank 8 that narrows down to wall thickness '.Hollow blank 8 ' diameter can be identical, littler or bigger after pre-the extension.
After this with hollow blank 8 ' via a lateral transfer 9 ' supply at forging machine 10 illustrated in fig. 1.Because the step of following is the identical repetition of saving.
Exemplarily make the hollow blank 8 of a size 500mm external diameter * 180mm wall thickness and length 4.3m later in punching by that have a size 500mm circle and the blank 1 of length 4m by the process shown in Fig. 1.
By after the elongating mill, provide a hollow blank 8 with size 480mm external diameter * 120mm wall thickness and 5.8m length '.
Fig. 3 illustrates a longitudinal section that is in the hollow blank 8 to be forged of interlocking, and this hollow blank enters forging machine and leaves forging machine as hot-rolled pipe 16 on the right from the left side.In forging the zone, go up outside in this embodiment four forge tile fragments 21,21 ', 21 ", 21 and in inner face one cylindrical plug 22 mating reactions.Plug 22 passes through a fixed bar 23 fixed positions, but also can be by selecting that it is moved forwards, backwards at the forging process axis.
Each forges the intake section 26 and that has a main tapered formation in the vertical section of tile fragment 21-21 and is right after thereafter smooth 27.Intake section 26 also can be the slight convex bending.
See that towards cross section (Fig. 4) whole forging tile fragment 21-21 has a recessed curved surface.Usually this curved surface is a circular arc, and its radius is greater than the radius of the reality of part to be forged.
Mark the corresponding radial stroke of forging tile fragment 21-21 of motion arrow 28 explanations among Fig. 3 and 4.
List of numerals
1 blank
2 swinging heating furnaces
3,3 ' roller-way
4 cross roll milling trains
5,5 ' cross roll
6 punching plugs
7 fixed bars
8 hollow blanks
9,9 ' lateral transfer
10 forging machines
11 in-house tools
12 manipulators, outlet side
13 manipulators, input side
14 forge frame
15 carry arrow
16 hot-rolled pipes
17 elongating mills
18,18 ' cross roll
19 chock plugs
20 fixed bars
21,21 ', 22 ", 22 forge tile fragment
22 plugs
23 fixed bars
24 rotation arrows
25 axial arrow
26 intake sections
27 smooths
28 motion arrows
Claims (27)
1. the manufacture method of seamless hot-finished steel tube, wherein make the hollow blank of a heavy wall in first forming step by punching since a blank that is heated to forming temperature, it is then extending into prefabricated pipe (pipe) and making a production tube by undergauge is rolling by it in the 3rd forming step by rolling in second forming step with identical temperature under the change of diameter and wall thickness; It is characterized in that, using at least two of inserting the in-house tool of hollow blank and a forging machine to affact under the situation of the forging tile fragment on the outer surface of hollow blank, it is the forming step of feature with rolling that forming step by a radial forging process form replaces the second and the 3rd, wherein makes hollow blank periodically in the rotation of the stage of the idle stroke of forging tile fragment with move axially.
2. in accordance with the method for claim 1, it is characterized in that while or time are gone up rotation and the axial advance that dislocation ground carries out hollow blank.
3. according to claim 1 and 2 described methods, it is characterized in that use four to forge tile fragment, these forge tile fragment and affact on the outer surface of hollow blank in a plane inter-sync.
4. according to the described method of claim 1-3, it is characterized in that in-house tool is slack in forging process.
5. according to the described method of claim 1-3, it is characterized in that the same direction motion that in-house tool is advanced vertically in forging process.
6. according to the described method of claim 1-3, it is characterized in that, make in-house tool direction motion in contrast to axial advance in forging process.
7. according to one of claim 1-6 described method, it is characterized in that, applying a release agent and lubricant on the inner face at hollow blank before the beginning radial forging process.
8. according to one of claim 1-7 described method, it is characterized in that first forming step is a kind of punch process.
9. in accordance with the method for claim 8, it is characterized in that, wear the bottom with backlash in punch process.
10. in accordance with the method for claim 8, it is characterized in that, cut off the bottom later in punch process.
11. according to the described method of claim 8-10, it is characterized in that, remove inside and outside oxide skin in punch process with after removing hollow blank bottom.
12. in accordance with the method for claim 8, it is characterized in that, after punch process, realize that by cross roll one extends in advance.
13. in accordance with the method for claim 12, it is characterized in that, removing hollow blank interior oxidation skin later on through cross roll.
14., it is characterized in that first forming step is the punching by means of cross roll according to one of claim 1-7 described method.
15. in accordance with the method for claim 14, it is characterized in that, after punching, realize pre-the extension by means of cross roll.
16. according to claim 14 and 15 described methods, it is characterized in that, remove the hollow blank interior oxidation skin of making.
17. according to one of claim 1-16 described method, it is characterized in that, make production tube through heat-treated.
18., it is characterized in that the alignment production tube according to one of claim 1-17 described method.
19., it is characterized in that the outer surface of machining production tube according to one of claim 1-18 described method.
20. in accordance with the method for claim 19, it is characterized in that described processing is grinding.
21. implement device in accordance with the method for claim 1, has a radial forging, this radial forging comprise one forge that the forging tile fragment of frame and at least two replaceable settings therein and a manipulator and put in the forging frame can axially movable plug; It is characterized in that, input side and each manipulator (12,13) of outlet side setting and at least outlet side have a guide rail.
22., it is characterized in that described guide rail is arranged on manipulator (12) and forges between the frame (14) according to the described device of claim 21.
23. according to claim 21 and 22 described devices, it is characterized in that, see that towards the vertical section each forges tile fragment (21-21 ) and be right after smooth smooth (27) thereafter and see that towards the cross section forging tile fragment (21-21 ) has a recessed curved surface having an intake section that narrows down gradually (26) and on the side of workpiece, wherein the radius in cross section accordingly is always greater than the radius of the reality of the hollow blank that is in interlocking (8,8 ').
24., it is characterized in that plug (22) is columniform according to one of claim 21-23 described device.
25., it is characterized in that plug is conical according to one of claim 21-23 described device.
26., it is characterized in that plug has step according to one of claim 21-23 described device.
27., it is characterized in that input side also has a guide rail according to one of claim 21-26 described device.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102004052406 | 2004-10-25 | ||
| DE102004052406.8 | 2004-10-25 | ||
| DE102005052178.9 | 2005-10-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101068636A true CN101068636A (en) | 2007-11-07 |
| CN100518989C CN100518989C (en) | 2009-07-29 |
Family
ID=38880881
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB200580041393XA Expired - Fee Related CN100518989C (en) | 2004-10-25 | 2005-10-25 | Method for production of a seamless hot-finished steel tube and device for carrying out the method |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN100518989C (en) |
| UA (1) | UA90116C2 (en) |
| ZA (1) | ZA200703246B (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102501000A (en) * | 2011-09-28 | 2012-06-20 | 南阳市红阳锻造有限公司 | Precision forming process for rim supporting shafts of engineering machinery and heavy-duty trucks |
| CN102761045A (en) * | 2012-07-19 | 2012-10-31 | 镇江步云电子有限公司 | Insertion core manufacturing process for radiofrequency coaxial connector |
| CN113118353A (en) * | 2021-04-21 | 2021-07-16 | 西安交通大学 | Surface-strengthened inner-step shaft inner hole precision forming process |
| CN113525012A (en) * | 2021-07-20 | 2021-10-22 | 安徽大昌科技股份有限公司 | Eccentric flaring torsion beam longitudinal arm structure |
| CN114210901A (en) * | 2021-10-26 | 2022-03-22 | 陕西钛博飞特航空制造股份有限公司 | Titanium alloy connecting rod volume forming special die for aero-engine |
| CN114713667A (en) * | 2022-03-18 | 2022-07-08 | 温州英特不锈钢有限公司 | Nonrust steel pipe forming device |
| CN114769352A (en) * | 2022-03-21 | 2022-07-22 | 温州英特不锈钢有限公司 | Stainless steel pipe forming method |
| CN117816882A (en) * | 2024-03-06 | 2024-04-05 | 江苏圣贤锻造有限责任公司 | Petrochemical pressure vessel tube plate forging equipment and process |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT346156B (en) * | 1977-04-01 | 1978-10-25 | Gfm Fertigungstechnik | FORGING MACHINE FOR FORGING LARGE PIPES OVER A LONG THORN |
| CN1003005B (en) * | 1985-04-01 | 1989-01-04 | 国营青岛钢厂 | Manufacture of fin-tube |
| RU2000160C1 (en) * | 1992-06-04 | 1993-09-07 | Московский институт стали и сплавов | Blanks with elongated axis radial reduction method |
| EP0764063B1 (en) * | 1994-06-16 | 1999-02-03 | MANNESMANN Aktiengesellschaft | Method of producing a seamless hot-finished tube |
| EP0787541B1 (en) * | 1994-10-20 | 2002-01-23 | Sumitomo Metal Industries, Ltd. | Method of manufacturing seamless steel pipes and manufacturing equipment therefor |
| CN2530742Y (en) * | 2002-02-07 | 2003-01-15 | 赵金发 | Tube mill mandrel |
| CN1207114C (en) * | 2002-09-21 | 2005-06-22 | 王旭午 | Technology for rolling seamless steel pipe |
-
2005
- 2005-10-25 UA UAA200705651A patent/UA90116C2/en unknown
- 2005-10-25 CN CNB200580041393XA patent/CN100518989C/en not_active Expired - Fee Related
-
2007
- 2007-04-19 ZA ZA200703246A patent/ZA200703246B/en unknown
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102501000A (en) * | 2011-09-28 | 2012-06-20 | 南阳市红阳锻造有限公司 | Precision forming process for rim supporting shafts of engineering machinery and heavy-duty trucks |
| CN102761045A (en) * | 2012-07-19 | 2012-10-31 | 镇江步云电子有限公司 | Insertion core manufacturing process for radiofrequency coaxial connector |
| CN113118353A (en) * | 2021-04-21 | 2021-07-16 | 西安交通大学 | Surface-strengthened inner-step shaft inner hole precision forming process |
| CN113525012A (en) * | 2021-07-20 | 2021-10-22 | 安徽大昌科技股份有限公司 | Eccentric flaring torsion beam longitudinal arm structure |
| CN114210901A (en) * | 2021-10-26 | 2022-03-22 | 陕西钛博飞特航空制造股份有限公司 | Titanium alloy connecting rod volume forming special die for aero-engine |
| CN114713667A (en) * | 2022-03-18 | 2022-07-08 | 温州英特不锈钢有限公司 | Nonrust steel pipe forming device |
| CN114713667B (en) * | 2022-03-18 | 2024-10-01 | 温州英特不锈钢有限公司 | Stainless steel pipe forming device |
| CN114769352A (en) * | 2022-03-21 | 2022-07-22 | 温州英特不锈钢有限公司 | Stainless steel pipe forming method |
| CN117816882A (en) * | 2024-03-06 | 2024-04-05 | 江苏圣贤锻造有限责任公司 | Petrochemical pressure vessel tube plate forging equipment and process |
| CN117816882B (en) * | 2024-03-06 | 2024-05-03 | 江苏圣贤锻造有限责任公司 | Petrochemical pressure vessel tube plate forging equipment and process |
Also Published As
| Publication number | Publication date |
|---|---|
| UA90116C2 (en) | 2010-04-12 |
| CN100518989C (en) | 2009-07-29 |
| ZA200703246B (en) | 2008-06-25 |
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