CN211161504U - Bent pipe forming die - Google Patents
Bent pipe forming die Download PDFInfo
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- CN211161504U CN211161504U CN201922004931.XU CN201922004931U CN211161504U CN 211161504 U CN211161504 U CN 211161504U CN 201922004931 U CN201922004931 U CN 201922004931U CN 211161504 U CN211161504 U CN 211161504U
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Abstract
The utility model relates to a return bend forming die, in particular to can process the radial return bend forming die of small curvature. The bending die comprises a clamping die, an outer pressing die and an inner pressing die, wherein a bent pipe die cavity is arranged in the clamping die, and the bent pipe die cavity comprises a first outer forming end surface matched with the shape of the outer diameter wall surface of a bent pipe of a target bent pipe; the outer die is internally provided with an inner die mounting hole, the inner die mounting hole is internally provided with an inner die, the inner die is provided with a first inner forming end surface matched with the pipe bend outer diameter wall surface of the target bent pipe in shape, the first inner forming end surface extends out of the outer die, and the first outer forming end surface and the first inner forming end surface can be mutually matched to carry out cold press forming on the pipe bend outer diameter wall surface. The utility model discloses a press from both sides interior moulding-die of tight mould cooperation, can process and produce the metal return bend that bend radius is greater than 0.4D, satisfy the demand of arranging business turn over water pipe in exhaust gas recirculation cooler's narrow and small installation space, manufacturing cost greatly reduced simultaneously.
Description
Technical Field
The utility model relates to a return bend forming die, in particular to can process the radial return bend forming die of small curvature.
Background
In the process of bending a pipe workpiece, a pipe bending die is required, and the pipe bending die comprises a clamping die, a profiling die, a bending die and the like and is used for bending a plate according to the size. The exhaust gas recirculation cooler needs to be provided with water inlet and outlet bent pipes with small curvature radius due to the narrow installation space.
In the prior art, the traditional pipe bending die can only process the bent pipe with a large curvature radius, and the bent pipe with a small curvature radius is generally preliminarily formed by a die casting process and then finally formed by a machining mode. The existing bending pipe forming process with small curvature radius has high processing cost, so that the product is expensive and is not suitable for large-scale popularization and application.
Chinese patent No. CN200510019283 discloses a method for forming a bend pipe with a small radius, which adopts a cored bending mode, namely, a sheet-shaped multidirectional core shaft, wherein a raw pipe blank to be bent is inserted into the core shaft, one end of the raw pipe blank is fixed with a bending die by a clamping force, and the bending die is driven by a pipe bender to rotate; in the process of bending and deforming the original pipe blank, two auxiliary thrusts in different directions are added to the pipe wall of the original pipe blank, wherein the thrusts in the same direction of internal stress generated by metal shrinkage are applied to the avoidance of the inner diameter of the pipe bend, the thrusts in the same direction of the internal stress generated by metal stretching are applied to the wall surface of the outer diameter of the pipe bend, and the mandrel is pulled out after the original pipe blank is bent to a specified angle. The method depends on the delicate structure that the sheet-shaped multi-directional core shaft can manufacture the metal bent pipe with the bent pipe wall thickness not less than 0.5mm and the bending radius more than 0.5D (D represents the diameter of the bent pipe body), but the sheet-shaped multi-directional core shaft consists of a plurality of hemispherical metal sheets, has the advantages of delicate structure and higher processing cost, and is not suitable for large-scale popularization and application.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a return bend forming die can process and produce the metal return bend that bend radius is greater than 0.4D, satisfies the demand of arranging business turn over water pipe in exhaust gas recirculation cooler's narrow and small installation space, manufacturing cost greatly reduced simultaneously.
The above technical purpose of the present invention can be achieved by the following technical solutions:
a bent pipe forming die comprises a clamping die, an outer pressing die and an inner pressing die, wherein a bent pipe die cavity is formed in the clamping die, and the bent pipe die cavity comprises a first outer forming end face matched with the shape of the outer diameter wall face of a bent pipe of a target bent pipe; an inner pressing die mounting hole is formed in the outer pressing die, an inner pressing die is arranged in the inner pressing die mounting hole, a first inner forming end face matched with the shape of the pipe bend outer diameter wall face of the target bent pipe is arranged on the inner pressing die, the first inner forming end face extends out of the outer pressing die, and the first outer forming end face and the first inner forming end face can be matched with each other to carry out cold press forming on the pipe bend outer diameter wall face; the outer pressing die is provided with a second outer forming end face matched with the shape of the inner diameter wall face of the pipe bend of the target bent pipe, a forming support end face is arranged on one side, facing the second outer forming end face, of the upper face of the inner pressing die, the shape of the forming support end face is matched with the shape of the inner surface of the straight pipe section of the target bent pipe, and the second outer forming end face and the forming support end face can be matched with each other to carry out cold press forming on the inner diameter.
Through adopting above-mentioned technical scheme, the outer compression mold carries out the clod wash shaping with the clamp die compound die, the outer shaping terminal surface of second of outer compression mold is with the pipe bend internal diameter wall cold press molding, shaping support end face forms the support to the side straight tube section, the stability in the cold press molding process is improved, when interior compression mold contacts the return bend inner wall, first outer shaping terminal surface and first interior shaping terminal surface can mutually support with pipe bend external diameter wall cold press molding, final clod wash molding obtains the target return bend that bend radius is greater than 0.4D, satisfy the demand of arranging the business turn over water pipe in waste gas recirculation cooler's narrow and small installation space, manufacturing cost greatly reduced simultaneously.
Furthermore, one end of the outer pressing die facing the elbow die cavity is provided with a straight pipe forming end face matched with the surface shape of the straight pipe section of the target elbow, and the straight pipe forming end face can be matched and connected with the elbow die cavity.
By adopting the technical scheme, when the outer compression mold and the clamping mold are closed, the straight pipe forming end face can be matched and connected with the bent pipe mold cavity, so that the straight pipe section of the bent pipe is not deformed in the cold bending process.
Furthermore, the outlet end of the bent pipe die cavity in the clamping die is provided with a die closing limiting end face, and one end of the external pressing die, facing the clamping die, is a die closing positioning end face matched with the die closing limiting end face in shape.
By adopting the technical scheme, when the outer compression mold and the clamping mold are closed, the closing limiting end face and the closing positioning end face are matched to limit the closing position.
Furthermore, the two sides of the outlet end of the bent pipe die cavity in the clamping die are respectively provided with a first side limit end surface and a second side limit end surface, and the left and right end surfaces of the outer pressing die can be respectively matched and connected with the first side limit end surface and the second side limit end surface.
Through adopting above-mentioned technical scheme, when the outer pressing die got into between the spacing terminal surface in first side and the spacing terminal surface in second side of pressing from both sides tight mould, the spacing terminal surface in first side and the spacing terminal surface in second side can restrict the position of outer pressing die left and right directions.
Furthermore, the rear end of the outer pressing die is connected with a cold pressing driving piece, and the cold pressing driving piece can drive the outer pressing die and the inner pressing die to move towards the direction of the clamping die to be closed.
Through adopting above-mentioned technical scheme, the driving piece of colding pressing provides drive power for the compound die, and the driving piece of colding pressing can drive outer moulding-die and interior moulding-die to pressing from both sides the mould direction removal compound die.
Further, the cold press drive can employ a hydraulic ram.
Through adopting above-mentioned technical scheme, hydraulic cylinder provides reliable and stable drive power for the compound die, and hydraulic cylinder can drive outer moulding-die and interior pressure mould to the mould direction removal compound die of pressing from both sides.
Furthermore, the clamping die comprises an upper clamping die and a lower clamping die which are correspondingly arranged up and down, and the upper end of the upper clamping die is connected with a die closing driving mechanism.
Through adopting above-mentioned technical scheme, compound die actuating mechanism can drive and press from both sides tight mould and press from both sides tight lower mould compound die.
Furthermore, a guide mechanism is arranged between the clamping upper die and the clamping lower die and comprises a guide rod and a guide sleeve, the guide sleeve is fixed on the clamping upper die, one end of the guide rod is fixed on the clamping lower die, and the guide sleeve is connected to the guide rod in a sliding mode.
By adopting the technical scheme, when the upper clamping die and the lower clamping die are assembled, the guide sleeve moves up and down along the guide rod in a guiding manner, so that the accuracy of assembling the upper clamping die and the lower clamping die is ensured.
To sum up, the utility model discloses following beneficial effect has:
1. the metal bent pipe with the bending radius larger than 0.4D can be processed and manufactured by matching the clamping die with the inner pressing die and the outer pressing die, the requirement of arranging a water inlet pipe and a water outlet pipe in a narrow installation space of the exhaust gas recirculation cooler is met, and meanwhile, the manufacturing cost is greatly reduced;
2. the straight pipe molding end face can be matched and connected with the die cavity of the bent pipe, so that the straight pipe section of the bent pipe is not deformed in the cold bending process;
3. the die closing position can be limited by matching the die closing limiting end face with the die closing positioning end face;
4. the position of the outer pressing die in the left and right directions can be limited by arranging the first side limiting end face and the second side limiting end face on the clamping die.
Drawings
Fig. 1 is a perspective view of the first viewing angle of the present invention.
Fig. 2 is a perspective view of the second viewing angle of the present invention.
Fig. 3 is a perspective view of the clamping die.
Fig. 4 is a view showing an installation structure of the outer die and the inner die.
Fig. 5 is a perspective view of the outer stamper.
Fig. 6 is a schematic view of a first step of a forming process using the present invention.
Fig. 7 is a schematic diagram of a second step of the forming process by cold bending according to the present invention.
Fig. 8 is a schematic diagram of a third step of performing a forming process by cold bending according to the present invention.
In the figure, 1, clamping an upper die; 2. clamping the lower die; 3. outer pressing die; 3.1, a second outer forming end face; 4. inner pressing die; 4.1, a first inner forming end surface; 4.2, forming a supporting end face; 5. a pipe bending die cavity; 5.1, a first outer forming end face; 6. forming an end face of the straight pipe; 7. a second profiled end face; 8. a first side limiting end surface; 9. a second side limit end surface; 10. a die assembly limiting end face; 11. closing the die and positioning the end face; A. a bend having a bend radius greater than 0.8D; B. and (5) forming the core rod.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Use the utility model discloses need be greater than 0.8D's return bend A with the first bending centre radius of pipe embryo before the little radius of curvature's of cold-forming return bend, then put into the big radius of curvature's return bend the utility model discloses well cold-forming bending radius is greater than 0.4D return bend, and D is return bend body diameter throughout, and the bending radius that final cold-bending becomes is greater than 0.4D return bend and is called the target return bend.
As shown in fig. 1 and 2, the utility model discloses mainly including pressing from both sides tight mould, outer moulding-die 3 and interior pressure mould 4, be equipped with return bend die cavity 5 in pressing from both sides tight mould, include in return bend die cavity 5 one with the identical first outer shaping terminal surface 5.1 of the pipe bend external diameter wall shape of target return bend.
As shown in fig. 4, an inner die mounting hole is provided in the outer die 3, and an inner die 4 is provided in the inner die mounting hole. The inner pressing die 4 is provided with a first inner forming end surface 4.1 matched with the shape of the outer diameter wall surface of the pipe bend of the target bent pipe, and the first inner forming end surface 4.1 extends out of the outer pressing die 3. When the bent pipe is formed by cold bending, the first outer forming end face 5.1 and the first inner forming end face 4.1 can be matched with each other to carry out cold press forming on the outer diameter wall face of the bent pipe.
As shown in fig. 3 and 5, the outer pressing die 3 is provided with a second outer forming end surface 3.1 matched with the shape of the inner diameter wall surface of the pipe bend of the target bent pipe, the inner pressing die 4 is provided with a forming support end surface 4.2 facing one side of the second outer forming end surface 3.1, the forming support end surface 4.2 is matched with the shape of the inner surface of the straight pipe section of the target bent pipe, and the second outer forming end surface 3.1 and the forming support end surface 4.2 can be matched with each other to carry out cold press forming on the inner diameter wall surface of the pipe. When the second outer forming end face 3.1 is used for cold press forming of the inner wall face of the pipe bend, the forming support end face 4.2 supports the straight pipe section, and stability in the cold press forming process is improved.
As shown in fig. 5, a straight pipe molding end face 6 matched with the surface shape of the straight pipe section of the target bent pipe is arranged at one end of the outer pressing die 3 facing the bent pipe die cavity 5, and the straight pipe molding end face 6 can be matched and connected with the bent pipe die cavity 5 during die assembly.
In order to ensure that the clamping die and the outer pressing die 3 can be matched and connected when the clamping die and the inner pressing die 4 are matched. As shown in fig. 1 and 5, an outlet end of a bent pipe die cavity 5 in the clamping die is provided with a die assembly limiting end face 10, one end of the outer pressing die 3 facing the clamping die is a die assembly positioning end face 11 matched with the die assembly limiting end face in shape, and when the die assembly limiting end face 10 is matched and connected with the die assembly positioning end face 11, the clamping die is matched with the outer pressing die 3 and the inner pressing die 4.
In order to ensure that the outer pressing die 3 accurately enters the die closing position of the clamping die, a first side limiting end surface 8 and a second side limiting end surface 9 are respectively arranged on two sides of the outlet end of the bent pipe die cavity 5 in the clamping die, and the left side end surface and the right side end surface of the outer pressing die 3 can be respectively matched and connected with the first side limiting end surface 8 and the second side limiting end surface 9.
In order to drive the outer pressing die 3 and the inner pressing die 4 to move towards the clamping die for die assembly, the rear end of the outer pressing die 3 is connected with a cold pressing driving piece, the cold pressing driving piece can drive the outer pressing die 3 and the inner pressing die 4 to move towards the clamping die for die assembly, and the bent pipe is extruded and formed. Preferably, the cold press drive can employ a hydraulic ram.
The clamping die comprises an upper clamping die 1 and a lower clamping die 2 which are correspondingly arranged up and down, a guide mechanism is arranged between the upper clamping die 1 and the lower clamping die 2, the upper end of the upper clamping die 1 is connected with a die assembly driving mechanism, and after a bent pipe with the bending center radius larger than 0.8D is placed into the clamping die, the upper clamping die 1 is driven by the die assembly driving mechanism to move downwards and is clamped with the lower clamping die 2.
The guide mechanism comprises a guide rod and a guide sleeve, the guide sleeve is fixed on the clamping upper die 1, one end of the guide rod is fixed on the clamping lower die 2, and the guide sleeve is connected to the guide rod in a sliding mode.
The utility model discloses a theory of operation is: before processing, the clamping upper die of the clamping die is opened, the elbow pipe A which is formed in the last step by cold bending and has the bending center radius larger than 0.8D is placed into the elbow pipe die cavity of the clamping die, then the die is closed, and as shown in fig. 6, the forming core rod B is plugged into the straight pipe section in the elbow pipe A. As shown in fig. 7, the outer pressing die 3 and the inner pressing die 4 are pushed so that the outer pressing die 3 enters between the first side limit end surface 8 and the second side limit end surface 9 of the clamping die, the first side limit end surface 8 and the second side limit end surface 9 can limit the position of the outer pressing die 3 in the left-right direction, and the inner pressing die 4 enters the inner cavity of the elbow pipe a. As shown in fig. 8, the outer press die 3 and the clamping die are combined, the second outer forming end surface 3.1 of the outer press die 3 is used for cold press forming of the inner diameter wall surface of the pipe bend, and the forming support end surface 4.2 is used for supporting the straight pipe section of the side surface, so that the stability in the cold press forming process is improved. When the inner pressing die 4 contacts the inner wall of the bent pipe A, the first outer forming end face 5.1 and the first inner forming end face 4.1 can be matched with each other to carry out cold press forming on the outer diameter wall face of the bent pipe. And finally, performing cold roll forming to obtain the target bent pipe with the bending radius larger than 0.4D.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications to the present embodiment without inventive contribution as required after reading the present specification, but all of them are protected by patent laws within the scope of the claims of the present invention.
Claims (8)
1. The utility model provides a return bend forming die, includes clamping die, outer moulding-die (3) and interior moulding-die (4), its characterized in that: a bent pipe die cavity (5) is arranged in the clamping die, and the bent pipe die cavity (5) comprises a first outer forming end surface (5.1) matched with the shape of the outer diameter wall surface of a bent pipe of a target bent pipe; an inner pressing die mounting hole is formed in the outer pressing die (3), an inner pressing die (4) is arranged in the inner pressing die mounting hole, a first inner forming end face (4.1) matched with the shape of the outer diameter wall face of the pipe bend of the target bent pipe is arranged on the inner pressing die (4), the first inner forming end face (4.1) extends out of the outer pressing die (3), and the first outer forming end face (5.1) and the first inner forming end face (4.1) can be matched with each other to carry out cold press forming on the outer diameter wall face of the pipe bend; the outer pressing die (3) is provided with a second outer forming end face (3.1) matched with the shape of the inner diameter wall face of the target bent pipe, a forming supporting end face (4.2) is arranged on one side, facing the second outer forming end face (3.1), of the inner pressing die (4), the shape of the forming supporting end face (4.2) is matched with the shape of the inner surface of the straight pipe section of the target bent pipe, and the second outer forming end face (3.1) and the forming supporting end face (4.2) can be matched with each other to perform cold press forming on the inner diameter wall face of the bent pipe.
2. The elbow forming mold according to claim 1, wherein: and a straight pipe molding end face (6) matched with the surface shape of the straight pipe section of the target bent pipe is arranged at one end of the outer pressing die (3) facing the bent pipe die cavity (5), and the straight pipe molding end face (6) can be matched and connected with the bent pipe die cavity (5).
3. The elbow forming mold according to claim 1, wherein: the outlet end of the bent pipe die cavity (5) in the clamping die is provided with a die closing limiting end face (10), and one end of the outer pressing die (3) facing the clamping die is provided with a die closing positioning end face (11) matched with the die closing limiting end face in shape.
4. The elbow forming mold according to claim 1, wherein: the two sides of the outlet end of the bent pipe die cavity (5) in the clamping die are respectively provided with a first side limiting end face (8) and a second side limiting end face (9), and the left side end face and the right side end face of the outer pressing die (3) can be respectively matched and connected with the first side limiting end face (8) and the second side limiting end face (9).
5. The elbow forming mold according to claim 1, wherein: the rear end of the outer pressing die (3) is connected with a cold pressing driving piece, and the cold pressing driving piece can drive the outer pressing die (3) and the inner pressing die (4) to move towards the direction of the clamping die to be closed.
6. The elbow forming mold according to claim 5, wherein: the cold press drive can be a hydraulic ram.
7. The elbow forming mold according to claim 1, wherein: the clamping die comprises an upper clamping die (1) and a lower clamping die (2) which are correspondingly arranged up and down, and the upper end of the upper clamping die (1) is connected with a die assembly driving mechanism.
8. The elbow forming mold according to claim 7, wherein: a guide mechanism is arranged between the clamping upper die (1) and the clamping lower die (2), the guide mechanism comprises a guide rod and a guide sleeve, the guide sleeve is fixed on the clamping upper die (1), one end of the guide rod is fixed on the clamping lower die (2), and the guide sleeve is connected to the guide rod in a sliding mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922004931.XU CN211161504U (en) | 2019-11-19 | 2019-11-19 | Bent pipe forming die |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922004931.XU CN211161504U (en) | 2019-11-19 | 2019-11-19 | Bent pipe forming die |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211161504U true CN211161504U (en) | 2020-08-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922004931.XU Active CN211161504U (en) | 2019-11-19 | 2019-11-19 | Bent pipe forming die |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211161504U (en) |
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2019
- 2019-11-19 CN CN201922004931.XU patent/CN211161504U/en active Active
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