CN102225447B - Cylinder head cover breather pipe machining die - Google Patents
Cylinder head cover breather pipe machining die Download PDFInfo
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- CN102225447B CN102225447B CN 201110124377 CN201110124377A CN102225447B CN 102225447 B CN102225447 B CN 102225447B CN 201110124377 CN201110124377 CN 201110124377 CN 201110124377 A CN201110124377 A CN 201110124377A CN 102225447 B CN102225447 B CN 102225447B
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Abstract
The invention discloses a cylinder head cover breather pipe machining die which is characterized by comprising a primary bending die and a secondary bending die; the primary bending die consists of an ejector rod, and a primary upper die and a primary lower die that are matched with each other, a primary bent cavity matched with a breather pipe is arranged between the primary upper die and the primary lower die, the bending angle of the primary bent cavity ranges from 100 degrees to 130 degrees, and the ejector rod can extend in the primary bent cavity; the secondary bending die consists of a secondary bending fixed sleeve and a secondary bending handle which are both provided with secondary bent cavities matched with the breather pipe, and an external camber surface similar to the internal camber surface at the bent part of the breather pipe is arranged at the end of the secondary bent cavity of the secondary bending fixed sleeve. By using the cylinder head cover breather pipe machining die effectively, the technical problem that due to thin wall and large bending angle, the breather pipe is easy to cause cracks at the bent part after being directly bent and can not meet the technical requirements can be solved, and the breather pipe of an automobile engine cylinder covers of the series technical requirements is localized, thus lowering the cost.
Description
Technical field
The present invention relates to valve mechanism cover breather pipe processing technique field, particularly a kind of valve mechanism cover breather pipe processing mold.
Background technology
Cylinder cover of automobile engine cover breather pipe is generally steel pipe, and according to its job requirement, its surfaces externally and internally has not allowed crackle, folds, rolls folding, absciss layer, scabbed and corrosion, in air pressure is to keep 30s not have leakage under the situation of 9.8kpa.When common steel tube is processed into breather pipe, need steel pipe is bent into 90 degree bend pipes, behind the tube bending, the outer peripheral wall thickness in its knee reduces and can not surpass 30%.
When processing breather pipe at present, all adopt the processing technology of direct bending, namely by steel pipe is applied moment of flexure, once steel pipe is bent into 90 degree bend pipes.But adopt the processing technology of direct bending, when bending, the tube bending position is equivalent to be subjected to pulling force, wall thickness reduces, because airway wall thick extremely thin (1mm is only arranged), angle of bend big (90 °), and must guarantee the interior curved arc degree (radian is very little) after the bending, the pipe outward flange is easy to form crackle and pipe and loses circle (the tube bending position becomes ellipse) behind the bending, and can not guarantee the crooked position wall thickness reduce 30% with the profile at interior and expansion position must be concentric with tube axis the specification requirement of (center of circle of tube bending place, center of circle axis of outward flange cambered surface that is crooked position is concentric).
How solving owing to adopt direct bending technology to cause that crackle appears in the breather pipe crooked position, wall thickness change is big and do not satisfy the technical barrier of specification requirement, is those skilled in the art's problem demanding prompt solutions.
Summary of the invention
In view of this, the invention provides a kind of valve mechanism cover breather pipe processing mold, to solve owing to adopt direct bending technology to cause the breather pipe crooked position crackle to occur, lose circle and do not satisfy the technical barrier of specification requirement.
For achieving the above object, the invention provides following technical scheme:
A kind of valve mechanism cover breather pipe processing mold comprises bending mould and secondary bending mould;
A described bending mould comprises push rod and a patrix and a counterdie of cooperatively interacting, be provided with the first order buckling die cavity that cooperates with breather pipe between a described patrix and a counterdie, its angle of bend is 100 °～130 °, and described push rod can stretch in the described first order buckling die cavity;
Described secondary bending mould comprises two curved fixed cover and two bending of the hand handles, described two curved fixed covers and two bending of the hand handles are equipped with the second order buckling die cavity that cooperates with described breather pipe, and the port of the second order buckling die cavity of described two curved fixed covers is provided with the extrados identical with breather pipe crooked position inner arc surface.
Preferably, in above-mentioned valve mechanism cover breather pipe processing mold, a described bending mould also comprises a guide pillar that passes a described patrix and a counterdie respectively.
Preferably, in above-mentioned valve mechanism cover breather pipe processing mold, a described counterdie is provided with the counterdie guide hole that cooperates with a described guide pillar;
A described patrix is provided with the patrix guide hole, is provided with guide pin bushing in this patrix guide hole, and described guide pin bushing is provided with the mating holes that cooperates with a described guide pillar.
Preferably, in above-mentioned valve mechanism cover breather pipe processing mold, described first order buckling die cavity specifically comprises the first crooked half mould chamber that is arranged on the described patrix and the second crooked half mould chamber that is arranged on the described counterdie.
Preferably, in above-mentioned valve mechanism cover breather pipe processing mold, the described first crooked half mould chamber is opened on the hard alloy blocks on the described patrix;
The described second crooked half mould chamber is opened on the hard alloy blocks on the described counterdie.
Preferably, in above-mentioned valve mechanism cover breather pipe processing mold, a described guide pillar is two, and being plugged on a described patrix and the counterdie of becoming that the diagonal angle distributes.
Preferably, in above-mentioned valve mechanism cover breather pipe processing mold, also comprise shaping mould, this shaping mould comprises shaping patrix and the shaping counterdie that cooperatively interacts, and described shaping patrix is provided with the shaping die cavity identical with the breather pipe external structure with the shaping counterdie.
Preferably, in above-mentioned valve mechanism cover breather pipe processing mold, described shaping mould also comprises the shaping guide pillar that passes described shaping patrix and shaping counterdie respectively;
Described shaping patrix is provided with the patrix guide hole that cooperates with described shaping guide pillar;
Described shaping counterdie is provided with the counterdie guide hole that cooperates with described shaping guide pillar.
Preferably, in above-mentioned valve mechanism cover breather pipe processing mold, described shaping guide pillar is two, and becomes being plugged on described shaping patrix and the shaping counterdie that the diagonal angle distributes.
Preferably, in above-mentioned valve mechanism cover breather pipe processing mold, described shaping mould also comprises the die shank that is connected with described shaping patrix by screw.
From above-mentioned technical scheme as can be seen, the present invention includes bending mould and secondary bending mould, one time the bending mould comprises push rod and a patrix and a counterdie of cooperatively interacting, be provided with the first order buckling die cavity that cooperates with breather pipe between a described patrix and a counterdie, by earlier pipe being put into the first order buckling die cavity, during bending, push rod withstands the upper surface of pipe, along with moving down of push rod, pipe moves down gradually along the first order buckling die cavity, and formation extruding in the first order buckling die cavity, because extruding also is a progressive process, so the variation of the wall thickness of the bending of pipe is little and very even, can satisfy fully the crooked position wall thickness can not reduce 30% and the profile at expansion position must be concentric with tube axis specification requirement.
Secondary bending mould comprises two curved fixed cover and two bending of the hand handles, two curved fixed covers and two bending of the hand handles are equipped with the second order buckling die cavity that cooperates with breather pipe, and the port of the second order buckling die cavity of two curved fixed covers is provided with the extrados identical with breather pipe crooked position inner arc surface.Breather pipe semi-finished product one end of bending to 100 °～130 ° is inserted in the second order buckling die cavity of two curved fixed covers, design has the extrados identical with breather pipe crooked position inner arc surface on the two curved fixed covers, the half-finished other end of breather pipe is inserted in the second order buckling die cavity of two bending of the hand handles, this operation bending angle only has 10～40 °, the breather pipe angle reaches 90 ° behind the bending, and breather pipe crooked position inner arc surface also can guarantee; Because the bending angle is little, bending can't cause that crackle appears in the tube bending position, the crooked position wall thickness change is very little.
In another preferred version of the present invention, also be provided with shaping mould, this shaping mould comprises shaping patrix and the shaping counterdie that cooperatively interacts, the shaping patrix is provided with the shaping die cavity identical with the breather pipe external structure with the shaping counterdie.Because circle is lost in pipe pipe extrusion when bending and secondary bending, so the requirement by product has designed shaping mould, earlier the pipe behind the secondary bending is put into the shaping die cavity, during work, when shaping patrix and the applying of shaping counterdie, pipe is formed shaping, make product reach the specification requirement of regulation.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
The structural representation of the bending mould that Fig. 1 embodiment of the invention provides;
The structural representation of the counterdie that Fig. 2 provides for the embodiment of the invention;
Fig. 3 is that Fig. 2 is along the cutaway view of D-D line;
The structural representation of the patrix that Fig. 4 provides for the embodiment of the invention;
Fig. 5 is that Fig. 4 is along the cutaway view of D-D line;
The structural representation of the secondary bending mould that Fig. 6 provides for the embodiment of the invention;
The structural representation of the shaping mould that Fig. 7 provides for the embodiment of the invention;
The structural representation of the shaping patrix that Fig. 8 provides for the embodiment of the invention;
Fig. 9 is that Fig. 8 is along the cutaway view of B-B line;
The structural representation of the shaping counterdie that Figure 10 provides for the embodiment of the invention;
Figure 11 is that Figure 10 is along the cutaway view of B-B line.
The specific embodiment
The invention discloses a kind of valve mechanism cover breather pipe processing mold, to solve owing to adopt direct bending technology to cause the breather pipe crooked position crackle to occur, lose circle and do not satisfy the technical barrier of specification requirement.
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
See also Fig. 1-Fig. 6, the structural representation of the bending mould that Fig. 1 embodiment of the invention provides; The structural representation of the counterdie that Fig. 2 provides for the embodiment of the invention; Fig. 3 is that Fig. 2 is along the cutaway view of D-D line; The structural representation of the patrix that Fig. 4 provides for the embodiment of the invention;
Fig. 5 is that Fig. 4 is along the cutaway view of D-D line; The structural representation of the secondary bending mould that Fig. 6 provides for the embodiment of the invention.
Valve mechanism cover breather pipe processing mold provided by the invention comprises bending mould 1 and secondary bending mould 2.Wherein, one time bending mould 1 comprises push rod 11 and a patrix 13 and a counterdie 12 of cooperatively interacting, be provided with the first order buckling die cavity that cooperates with breather pipe between a patrix 13 and a counterdie 12, its angle of bend is 100 °～130 °, and push rod 11 can stretch in the first order buckling die cavity.Push rod 11 is used for withstanding an end and stretches into the interior pipe of first order buckling die cavity, under external force pipe is bent into the shape with first order buckling die cavity same flexure angle.
By earlier pipe being put into the first order buckling die cavity, during bending, push rod 11 withstands the upper surface of pipe, along with moving down of push rod 11, pipe moves down gradually along the first order buckling die cavity, and forms extruding in the first order buckling die cavity, because extruding also is a progressive process, so the variation of the wall thickness of the bending of pipe is little and very even, can satisfy fully the crooked position wall thickness can not reduce 30% and the profile at expansion position must be concentric with tube axis specification requirement.
During the secondary bending, breather pipe semi-finished product one end that is folded into 100 °～130 ° during a bending inserts in the second order buckling die cavity of two curved fixed covers 22, design has the extrados identical with breather pipe crooked position inner arc surface on the two curved fixed covers 22, therefore can guarantee that the intrados of breather pipe 3 meets specification requirement.The half-finished other end of breather pipe inserts in the second order buckling die cavity of two bending of the hand handles 21, and this operation bending angle only has 10～40 °, and the breather pipe angle reaches 90 ° behind the bending, and breather pipe crooked position inner arc surface also can guarantee.Because the bending angle is little, bending can't cause that crackle appears in the tube bending position, the crooked position wall thickness change is very little.
When bending in order to limit secondary, the breather pipe semi-finished product rotate along the second order buckling die cavity in the two curved fixed covers 22, influence the half-finished second order buckling of breather pipe, can backing pin be set at the end face of two curved fixed covers 22, expose to an end of two curved fixed covers 22 with restriction breather pipe semi-finished product, rotate along two axis of bending the second order buckling die cavity of fixed covers 22, thus the half-finished rotation of restriction breather pipe.
Bending operation based on bending mould and secondary bending mould, solved the technical barrier that breather pipe easily causes the crooked position crackle to occur after because of wall thickness, the big directly bending of angle of bend and do not satisfy specification requirement effectively, and the used breather pipe production domesticization of the automobile engine cylinder cover that makes this series technique requirement, reduced cost.
For patrix 13 satisfying a bending mould 1 and counterdie 12 guidance quality with to neutrality, a bending mould 1 provided by the invention also comprises a guide pillar 15 that passes a patrix 13 and a counterdie 12 respectively.Realize the centering of the first order buckling die cavity on patrix 13 and the counterdie 12 by guide pillar 15.
Counterdie 12 is provided with 122, the patrixes 13 of counterdie guide hole that cooperate with guide pillar 15 and is provided with patrix guide hole 132, is provided with guide pin bushing 14 in this patrix guide hole 132, and guide pin bushing 14 is provided with the mating holes that cooperates with guide pillar 15.The first order buckling die cavity specifically comprises and is arranged on the first crooked half mould chamber 131 on patrix 13 and is arranged on the second crooked half mould chamber 121 on the counterdie 12 one time.
Based on above-mentioned setting, pass mating holes on the guide pin bushing 14 and the counterdie guide hole 122 on counterdie 12 respectively by guide pillar 15, guarantee that the 131 and second crooked half mould chamber 121, the first crooked half mould chamber forms cross sections and be circular first order buckling die cavity.Reduced the difficulty of centering, and avoided being subjected under the effect of side force at a patrix 13 or a counterdie 12, the 131 and second crooked half mould chamber 121, the first crooked half mould chamber is crooked, loses the drawback of centering effect.
No. one time guide pillar 15 is two, and being plugged on patrix 13 and the counterdie 12 of becoming that the diagonal angle distributes.Centering location by two guide pillars 15 that become the diagonal angle to distribute can satisfy a patrix 13 and a counterdie 12 need not to arrange a more guide pillar 15, avoids causing the waste on the resource, reduces manufacturing cost.
At least one end of first order buckling die cavity exposes to bending mould 1 one time, during bending, one end of breather pipe pipe is stretched in the first order buckling die cavity by an end that exposes to a bending mould 1 of first order buckling die cavity, and act on the breather pipe pipe by push rod 11, under the effect of pressure, the breather pipe pipe moves along the first order buckling die cavity, and will rub this moment with the sidewall of first order buckling die cavity.In order to improve the scuff resistance of first order buckling cavity lateral, the first crooked half mould chamber 131 is opened on hard alloy blocks 133 on the patrix 13, and the second crooked half mould chamber 121 is opened on hard alloy blocks 123 on the counterdie 12.Because carbide alloy has high strength and high-wearing feature, so the first order buckling die cavity can adapt to the repeatedly friction of breather pipe pipe and its sidewall, improved the service life of a bending mould 1.
See also Fig. 7-Figure 11, the structural representation of the shaping mould that Fig. 7 provides for the embodiment of the invention; The structural representation of the shaping patrix that Fig. 8 provides for the embodiment of the invention; Fig. 9 is that Fig. 8 is along the cutaway view of B-B line; The structural representation of the shaping counterdie that Figure 10 provides for the embodiment of the invention; Figure 11 is that Figure 10 is along the cutaway view of B-B line.
In order to solve because circle is lost in pipe pipe extrusion when bending and secondary bending, the present invention also can comprise shaping mould 4, this shaping mould 4 comprises shaping patrix 42 and the shaping counterdie 43 that cooperatively interacts, and shaping patrix 42 and shaping counterdie 43 are provided with the shaping die cavity identical with breather pipe external structure (being interpreted as satisfying the external structure of the breather pipe of specification requirement).Because shaping patrix 42 is provided with the shaping die cavity identical with the breather pipe external structure with shaping counterdie 43, therefore can lose the breather pipe of circle by 4 pairs of extrusions of this shaping mould, be shaped as the breather pipe that satisfies specification requirement.During shaping, earlier the breather pipe behind the secondary bending is put into the shaping die cavity, during work, when shaping patrix and the applying of shaping counterdie, breather pipe is formed shaping, make product reach the specification requirement of regulation.
For the shaping patrix 42 that satisfies shaping mould 4 and shaping counterdie 43 guidance quality with to neutrality, shaping mould 4 also comprises the shaping guide pillar 44 that passes shaping patrix 42 and shaping counterdie 43 respectively, shaping patrix 42 is provided with the patrix guide hole 422 that cooperates with shaping guide pillar 44, and shaping counterdie 43 is provided with the counterdie guide hole 432 that cooperates with shaping guide pillar 44.The shaping die cavity specifically comprises the first shaping half mould chamber 421 and the second shaping half mould chamber 431 that is arranged on the shaping counterdie 43 that is arranged on the shaping patrix 42.
Based on above-mentioned setting, pass patrix guide hole 422 on the shaping patrix 42 and the counterdie guide hole 432 on the shaping counterdie 43 respectively by shaping guide pillar 44, guarantee that the first shaping half mould chamber 421 and the second shaping half mould chamber 431 form cross sections and be circular shaping die cavity.Reduced the difficulty of centering, and avoided being subjected under the effect of side force at shaping patrix 42 or shaping counterdie 43, the first shaping half mould chamber 421 and the second shaping half mould chamber 431 are crooked, lose the drawback of centering effect.
Shaping mould 4 also comprises the die shank 41 that is connected with shaping patrix 42 by screw 45, shaping patrix 42 is provided with the screw hole 423 that cooperates with this screw 45, in order to guarantee the connective stability of shaping patrix 42 and die shank 41, screw hole 423 is four altogether, namely realizes being connected of shaping patrixes 42 and die shank 41 by four screws 45.
Each embodiment adopts the mode of going forward one by one to describe in this specification, and what each embodiment stressed is and the difference of other embodiment that identical similar part is mutually referring to getting final product between each embodiment.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be apparent concerning those skilled in the art, and defined General Principle can realize under the situation that does not break away from the spirit or scope of the present invention in other embodiments herein.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the wideest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. a valve mechanism cover breather pipe processing mold is characterized in that, comprises a bending mould (1) and secondary bending mould (2);
A described bending mould (1) comprises push rod (11) and a patrix (13) that cooperatively interacts and a counterdie (12), be provided with the first order buckling die cavity that cooperates with breather pipe between a described patrix (13) and the counterdie (12), its angle of bend is 100 °～130 °, and described push rod (11) can stretch in the described first order buckling die cavity;
Described secondary bending mould (2) comprises two curved fixed cover (22) and two bending of the hand handles (21), described two curved fixed covers (22) and two bending of the hand handles (21) are equipped with the second order buckling die cavity that cooperates with described breather pipe, and the port of the second order buckling die cavity of described two curved fixed covers (22) is provided with the extrados identical with breather pipe (3) crooked position inner arc surface.
2. valve mechanism cover breather pipe processing mold as claimed in claim 1 is characterized in that, a described bending mould (1) also comprises a guide pillar (15) that passes a described patrix (13) and a described counterdie (12) respectively.
3. valve mechanism cover breather pipe processing mold as claimed in claim 2 is characterized in that, a described counterdie (12) is provided with the counterdie guide hole (122) that cooperates with a described guide pillar (15);
A described patrix (13) is provided with patrix guide hole (132), is provided with guide pin bushing (14) in this patrix guide hole (132), and described guide pin bushing (14) is provided with the mating holes that cooperates with a described guide pillar (15).
4. valve mechanism cover breather pipe processing mold as claimed in claim 2, it is characterized in that described first order buckling die cavity specifically comprises and is arranged on the first crooked half mould chamber (131) on the described patrix (13) and is arranged on the second crooked half mould chamber (121) on the described counterdie (12).
5. valve mechanism cover breather pipe processing mold as claimed in claim 4 is characterized in that, the described first crooked half mould chamber (131) is opened on the hard alloy blocks (133) on the described patrix (13);
The described second crooked half mould chamber (121) is opened on the hard alloy blocks (123) on the described counterdie (12).
6. valve mechanism cover breather pipe processing mold as claimed in claim 2 is characterized in that, a described guide pillar (15) is two, and becomes being plugged on a described patrix (13) and the counterdie (12) that the diagonal angle distributes.
7. as each described valve mechanism cover breather pipe processing mold of claim 1-6, it is characterized in that, also comprise shaping mould (4), this shaping mould (4) comprises shaping patrix (42) and the shaping counterdie (43) that cooperatively interacts, and described shaping patrix (42) is provided with the shaping die cavity identical with the breather pipe external structure with shaping counterdie (43).
8. valve mechanism cover breather pipe processing mold as claimed in claim 7 is characterized in that, described shaping mould (4) also comprises the shaping guide pillar (44) that passes described shaping patrix (42) and shaping counterdie (43) respectively;
Described shaping patrix (42) is provided with the patrix guide hole (422) that cooperates with described shaping guide pillar (44);
Described shaping counterdie (43) is provided with the counterdie guide hole (432) that cooperates with described shaping guide pillar (44).
9. valve mechanism cover breather pipe processing mold as claimed in claim 8 is characterized in that, described shaping guide pillar (44) is two, and becomes being plugged on described shaping patrix (42) and the shaping counterdie (43) that the diagonal angle distributes.
10. valve mechanism cover breather pipe processing mold as claimed in claim 9 is characterized in that, described shaping mould (4) also comprises the die shank (41) that is connected with described shaping patrix (42) by screw (45).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110124377 CN102225447B (en) | 2011-05-13 | 2011-05-13 | Cylinder head cover breather pipe machining die |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110124377 CN102225447B (en) | 2011-05-13 | 2011-05-13 | Cylinder head cover breather pipe machining die |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102225447A CN102225447A (en) | 2011-10-26 |
| CN102225447B true CN102225447B (en) | 2013-07-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110124377 Expired - Fee Related CN102225447B (en) | 2011-05-13 | 2011-05-13 | Cylinder head cover breather pipe machining die |
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| CN (1) | CN102225447B (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US11612404B2 (en) * | 2019-08-14 | 2023-03-28 | Biosense Webster (Israel) Ltd. | Jig for straightening and bending a malleable tool |
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|---|---|---|---|---|
| US5407613A (en) * | 1993-11-09 | 1995-04-18 | Schulte; Franz | Process and apparatus for bending plastic pipe |
| JP2000135517A (en) * | 1998-10-28 | 2000-05-16 | Showa Alum Corp | Push-through type bending equipment and bending method |
| JP2001105033A (en) * | 1999-09-30 | 2001-04-17 | Sumitomo Metal Ind Ltd | Pipe bender |
| JP2003170226A (en) * | 2001-12-06 | 2003-06-17 | Mitsubishi Heavy Ind Ltd | Apparatus and method for bending pipe |
| JP2004130345A (en) * | 2002-10-10 | 2004-04-30 | Sanoh Industrial Co Ltd | Bending method for multi-layered tube, and core metal |
| CN1799722A (en) * | 2004-12-31 | 2006-07-12 | 广东工业大学 | Thin-wall tube curvature-variable push-bending process and die |
| CN101147934A (en) * | 2007-11-08 | 2008-03-26 | 上海交通大学 | Tube bending forming processing device |
| CN102009090A (en) * | 2010-10-09 | 2011-04-13 | 江苏华阳管业股份有限公司 | Reforming mould during extrusion molding of bent pipe |
-
2011
- 2011-05-13 CN CN 201110124377 patent/CN102225447B/en not_active Expired - Fee Related
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5407613A (en) * | 1993-11-09 | 1995-04-18 | Schulte; Franz | Process and apparatus for bending plastic pipe |
| JP2000135517A (en) * | 1998-10-28 | 2000-05-16 | Showa Alum Corp | Push-through type bending equipment and bending method |
| JP2001105033A (en) * | 1999-09-30 | 2001-04-17 | Sumitomo Metal Ind Ltd | Pipe bender |
| JP2003170226A (en) * | 2001-12-06 | 2003-06-17 | Mitsubishi Heavy Ind Ltd | Apparatus and method for bending pipe |
| JP2004130345A (en) * | 2002-10-10 | 2004-04-30 | Sanoh Industrial Co Ltd | Bending method for multi-layered tube, and core metal |
| CN1799722A (en) * | 2004-12-31 | 2006-07-12 | 广东工业大学 | Thin-wall tube curvature-variable push-bending process and die |
| CN101147934A (en) * | 2007-11-08 | 2008-03-26 | 上海交通大学 | Tube bending forming processing device |
| CN102009090A (en) * | 2010-10-09 | 2011-04-13 | 江苏华阳管业股份有限公司 | Reforming mould during extrusion molding of bent pipe |
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| CN102225447A (en) | 2011-10-26 |
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Address after: Jiangbei District dashiba 400021 Chongqing City 2 Village Applicant after: Chongqing Jan Sant Auto Parts Co., Ltd. Address before: Jiangbei District dashiba 400021 Chongqing City 2 Village Applicant before: Chong Qing Jan Sant Machine Manufacture Co., Ltd. |
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