CA2539332A1 - Method and device for producing a peripherally closed hollow profiled element - Google Patents
Method and device for producing a peripherally closed hollow profiled element Download PDFInfo
- Publication number
- CA2539332A1 CA2539332A1 CA002539332A CA2539332A CA2539332A1 CA 2539332 A1 CA2539332 A1 CA 2539332A1 CA 002539332 A CA002539332 A CA 002539332A CA 2539332 A CA2539332 A CA 2539332A CA 2539332 A1 CA2539332 A1 CA 2539332A1
- Authority
- CA
- Canada
- Prior art keywords
- slide
- profiled element
- hollow profiled
- forming
- blank
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
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
- B21D35/00—Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
-
- 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
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/02—Stamping using rigid devices or tools
- B21D22/06—Stamping using rigid devices or tools having relatively-movable die parts
-
- 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
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/033—Deforming tubular bodies
- B21D26/047—Mould construction
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
The invention relates to a method and a device (1) for producing a peripherally closed hollow profiled element by means of fluidic internal high pressure. The inventive device comprises an internal high pressure form tool consisting of an upper die (3) and a lower die (4), the cavities (5 and 6) thereof enclosing a form chamber (7) for the hollow profiled element. The diameter of said form chamber is smaller than that of the blank (8) of the hollow profiled element to be inserted into the form chamber (7). The aim of the invention is to enable a reliable internal high pressure forming of a blank of a hollow profiled element (8) inserted into the form chamber (7), to obtain the end shape of the hollow profiled element. To this end, a slide (9) can be displaced transversally to the direction of displacement of the form tool (2) when the blank (8) is compressed in the internal high pressure form tool (2) in order to form an intermediate shape (22).
Description
r DaimlerChrysler AG
Method and device for producing a peripherally closed hollow profiled element The invention relates to a method for producing a peripherally closed hollow profiled element according to the preamble of patent claim 1 and to a device for this purpose according to the preamble of patent claim 2.
A generic device and a generic method are known from EP 0 621 091 B1. An internal high-pressure forming tool, which consists of an upper die and of a lower die, may be gathered from said publication. The lower die has a forming space which introduction slopes adjoin upwardly. The upper die has on its underside a ram-like extension which is beveled laterally according to the introduction slopes. To produce a hollow profiled element, then, a hollow profiled element blank is laid onto the introduction slopes, after which the ram-shaped extension squeezes the hollow profiled element blank into the forming space of the lower die.
During the squeezing operation, creases, corrugations and edges having different wall thicknesses and inherent stresses arise in an uncontrolled way in the hollow profiled element which has, in terms of its height, an oversize, as compared with the forming space. When the hollow profiled element blank lies completely in the forming space, then, the latter has an intermediate form which possesses a rough contour approximating to the contour of the forming space. When the forming tool is in the closed position, a fluidic internal high pressure is then generated within the hollow profiled element blank preprofiled in this way and expands the hollow profiled element blank until it comes to bear against the walls of the forming space which are formed by the impression of the lower die. On account of the abovementioned creases, corrugations and edges with different wall thicknesses and inherent stresses and high degrees of hardening, during the known preprofiling weak points are generated, at which the risk of bursting of the hollow profiled element blank is particularly high in the subsequent expanding forming by means of internal high pressure.
Furthermore, the hollow profiled element blank is spaced relatively far apart from the impression wall of the forming space in the region of the creases, so that the reduced expandability of the material still available after squeezing is not sufficient to allow complete expansion with a high degree of process reliability.
The object on which the invention is based is to develop a generic method to the effect that it becomes possible to have internal high-pressure forming of a hollow profiled element blank introduced with oversize into the forming space and to be preprofiled into a final form of the hollow profiled element with a high degree of process reliability. A device which serves for carrying out the method is likewise to be specified.
The object is achieved, according to the invention, by means of the features of patent claim 1 with regard to the method and by means of the features of patent claim 2 with regard to the device.
By virtue of the invention, the hollow profiled element blank having oversize can be inserted in a simple way into a lower portion of the forming space, without the latter at the same time being deformed. During the movement of closing the forming tool, then, at least one slide is activated, which is guided laterally onto the hollow profiled element blank by a drive means of the device. Since the hollow profiled element blank already lies in part of the forming space, the blank can be pressed uniformly by the slide, thus avoiding a flow of substance of the blank material over an edge of the forming tool, which causes creases and frictional wear on the hollow profiled element blank. During the pressing operation, the hollow profiled element blank can spread out freely toward the upper die until the upper die comes to lie on the lower die and closes off the forming space upwardly. As a result of the free spread of the hollow profiled element blank, the latter comes on all sides relatively close to the impression of the upper die, so that, during subsequent expansion by means of internal high pressure, only a little expandability of the hollow profiled element blank is necessary in order to come to bear completely against the impression. Since, during the preprofiling of the hollow profiled element blank, no creases and similar phenomena which are an impediment to forming occur on the hollow profiled element blank, and the degree of forming of the preprofiled intermediate form of the hollow profiled element blank into the final form of the hollow profiled element is low, a hollow profiled element blank provided with oversize, as compared with the forming space, can, on the one hand, be preprofiled with a high degree of process reliability and, on the other hand, be shaped into the final form of the hollow profiled element with a high degree of process reliability.
In a preferred development of the device according to the invention, as claimed in claim 3, the pressing surface of the slide forms an impression which at least partially delimits the forming space laterally. The device is thereby simplified in structural terms, since the subsequent arrangement of an impression-carrying tool segment may be dispensed with. Moreover, if appropriate, after the preprofiling pressing operation, the forming tool would have to be opened once again in a complicated and time-consuming way in order to replace the slide for the tool segment.
In a further preferred development of the invention, as claimed in claim 4, during the internal high-pressure forming of the blank into the final form, the slide is held at the rear by a supporting means. Although it is conceivable that the slide can be detained by means of a stop pin which can pass through a transverse bore of the slide, a rear support is advantageous in that, on the one hand, access to the rear side of the slide from outside is very good and, on the other hand, the design of the support can be kept simple in structural terms .
In this case, it is conceivable, for example, that the support is taken over by a ram which is led up to the slide from outside. A further simplification would be that the drive means of the slide at the same time affords the support.
In a preferred development of the device according to the invention, as claimed in claim 5, the drive means is an oblique tension column which is fixed in the upper die and projects obliquely downward toward the lower die, the column being inclined toward the forming space. The slide in this case has a reception bore, the run of which corresponds to the oblique extent of the column and which is arranged with respect to the column such that the latter penetrates into the reception bore during the movement of closing the forming tool.
Although the drive means may have a pneumatic or hydraulic basis, a mechanical solution is preferred here, since it is far less complicated in terms of apparatus. In this case, of course, it is conceivable that the mechanical drive means is, for example, a ram which, with regard to the internal high- pressure forming tool, constitutes a separate component and possesses a separate control. However, with the proposed oblique tension column which is integrated into the forming tool and which penetrates into a reception bore of the slide during the closing movement, the slide is displaced in a structurally simple way between a position of non-use and a position of use solely as a result of the movement of closing or opening the forming tool, so that separate controls and the energy sources necessary for these may be dispensed with so as to achieve a saving in outlay and in resources. In order to bring about the automatic movement of the slide, however, the oblique tension column must be arranged so as to be inclined obliquely toward the forming space and the reception bore of the slide must be coordinated with the oblique run of the column. As a result of the movement of penetration or extraction of the guide column into or out of the reception bore, the column acts upon the slide according ~ to the wedge principle, so that the slide is moved by positive control. For an ordered displacement of the slide, it is in this case beneficial if the slide is guided laterally. It may be stressed once more, at this juncture, that, in said embodiment of the invention as claimed in claim 5, by the function of the drive means for the slide being transferred to the forming tool, the outlay in terms of apparatus for the device is reduced considerably and there is a saving in construction space for the device.
In a further preferred embodiment of the invention, as claimed in claim 6, the supporting means is the upper die which engages behind the slide in the closed position of the forming tool. By the supporting function of the slide being taken over by the forming tool, separate supporting means may be dispensed with, thus leading to a structural simplification of the device, and the outlay in terms of apparatus and in terms of control can be reduced.
In a further preferred embodiment of the invention, as claimed in claim 7, the upper die has, in its region engaging behind the slide, a wedge surface, the angular position of which corresponds to the angle of slope of the oblique tension column and which, in the closed position of the forming tool, bears against an identically angled wedge surface formed on the rear side of the slide. By a wedge surface being arranged in that region of the upper die in which the latter engages behind the slide and by the wedge surface bearing, in the closed position, against a wedge surface which is formed on the rear side of the slide, there is no risk of jamming between the slide and the upper die of the forming tool. Furthermore, the wear between the wedge surfaces, that is to say between the upper die and the slide on its rear side, is minimized.
In a further preferred development of the invention, as claimed in claim 8, a sliding plate, against which the upper die bears with its region engaging behind the slide, is arranged on the rear side of the slide. By the rear side of the slide having arranged on it a sliding plate which, moreover, may also alternatively be fastened to the wedge surface of the upper die, the friction between the upper die and the slide and therefore the wear between the two is minimized.
The invention is explained in more detail below by means of an exemplary embodiment illustrated in the drawing.
In this case, the figure shows, in a lateral longitudinal section, a device according to the invention with an oblique tension column as drive means of a slide and with an upper die, designed as supporting means, of a forming tool of the device, the figure being split in the illustration into an opening position of the forming tool (on the left) and a closed position of the forming tool (on the right).
The figure illustrates a device 1 for producing a peripherally closed hollow profiled element by means of fluidic internal high pressure, said device containing an internal high-pressure forming tool 2. The latter is composed of an upper die 3 and of a lower die 4, the impressions 5 and 6 of which enclose a forming space 7 for the hollow profiled element. The forming space 7 has inserted into it a hollow profiled element blank 8, the diameter of which is larger than that of the forming space 7. The device 1 comprises, furthermore, a member for pressing the blank 8 in the internal high-pressure forming tool 2, the member being formed by two slides 9 which are seated on the lower die 4 of the internal high-pressure forming tool 2 on the right and left laterally with respect to the hollow profiled element blank 8. Furthermore, the device 1 also contains a fluid high-pressure generation system which is fluidically connected at least to one end of the hollow profiled element blank 8. The underside 10 of the upper die 3 has worked into it oblique bores 11, in which oblique tension columns 12 are arranged and fixed. The oblique tension columns 12, one of which is assigned in each case to a slide 9, project obliquely downward toward the lower die 4, the columns 12 being inclined toward the forming space 7. The oblique tension columns 12 in each case form the drive means for the slide 9, by means of which the slide 9 can be moved between a position of use and a position of non-use during the movement of opening and closing the forming tool 2. The slide 9 has, for this purpose, a reception bore 13 , the run of which corresponds to the oblique extent of the column 12. The reception bore 13 is arranged in relation to the oblique tension column 12 such that the latter penetrates into the reception bore 13 during the movement of closing the forming tool
Method and device for producing a peripherally closed hollow profiled element The invention relates to a method for producing a peripherally closed hollow profiled element according to the preamble of patent claim 1 and to a device for this purpose according to the preamble of patent claim 2.
A generic device and a generic method are known from EP 0 621 091 B1. An internal high-pressure forming tool, which consists of an upper die and of a lower die, may be gathered from said publication. The lower die has a forming space which introduction slopes adjoin upwardly. The upper die has on its underside a ram-like extension which is beveled laterally according to the introduction slopes. To produce a hollow profiled element, then, a hollow profiled element blank is laid onto the introduction slopes, after which the ram-shaped extension squeezes the hollow profiled element blank into the forming space of the lower die.
During the squeezing operation, creases, corrugations and edges having different wall thicknesses and inherent stresses arise in an uncontrolled way in the hollow profiled element which has, in terms of its height, an oversize, as compared with the forming space. When the hollow profiled element blank lies completely in the forming space, then, the latter has an intermediate form which possesses a rough contour approximating to the contour of the forming space. When the forming tool is in the closed position, a fluidic internal high pressure is then generated within the hollow profiled element blank preprofiled in this way and expands the hollow profiled element blank until it comes to bear against the walls of the forming space which are formed by the impression of the lower die. On account of the abovementioned creases, corrugations and edges with different wall thicknesses and inherent stresses and high degrees of hardening, during the known preprofiling weak points are generated, at which the risk of bursting of the hollow profiled element blank is particularly high in the subsequent expanding forming by means of internal high pressure.
Furthermore, the hollow profiled element blank is spaced relatively far apart from the impression wall of the forming space in the region of the creases, so that the reduced expandability of the material still available after squeezing is not sufficient to allow complete expansion with a high degree of process reliability.
The object on which the invention is based is to develop a generic method to the effect that it becomes possible to have internal high-pressure forming of a hollow profiled element blank introduced with oversize into the forming space and to be preprofiled into a final form of the hollow profiled element with a high degree of process reliability. A device which serves for carrying out the method is likewise to be specified.
The object is achieved, according to the invention, by means of the features of patent claim 1 with regard to the method and by means of the features of patent claim 2 with regard to the device.
By virtue of the invention, the hollow profiled element blank having oversize can be inserted in a simple way into a lower portion of the forming space, without the latter at the same time being deformed. During the movement of closing the forming tool, then, at least one slide is activated, which is guided laterally onto the hollow profiled element blank by a drive means of the device. Since the hollow profiled element blank already lies in part of the forming space, the blank can be pressed uniformly by the slide, thus avoiding a flow of substance of the blank material over an edge of the forming tool, which causes creases and frictional wear on the hollow profiled element blank. During the pressing operation, the hollow profiled element blank can spread out freely toward the upper die until the upper die comes to lie on the lower die and closes off the forming space upwardly. As a result of the free spread of the hollow profiled element blank, the latter comes on all sides relatively close to the impression of the upper die, so that, during subsequent expansion by means of internal high pressure, only a little expandability of the hollow profiled element blank is necessary in order to come to bear completely against the impression. Since, during the preprofiling of the hollow profiled element blank, no creases and similar phenomena which are an impediment to forming occur on the hollow profiled element blank, and the degree of forming of the preprofiled intermediate form of the hollow profiled element blank into the final form of the hollow profiled element is low, a hollow profiled element blank provided with oversize, as compared with the forming space, can, on the one hand, be preprofiled with a high degree of process reliability and, on the other hand, be shaped into the final form of the hollow profiled element with a high degree of process reliability.
In a preferred development of the device according to the invention, as claimed in claim 3, the pressing surface of the slide forms an impression which at least partially delimits the forming space laterally. The device is thereby simplified in structural terms, since the subsequent arrangement of an impression-carrying tool segment may be dispensed with. Moreover, if appropriate, after the preprofiling pressing operation, the forming tool would have to be opened once again in a complicated and time-consuming way in order to replace the slide for the tool segment.
In a further preferred development of the invention, as claimed in claim 4, during the internal high-pressure forming of the blank into the final form, the slide is held at the rear by a supporting means. Although it is conceivable that the slide can be detained by means of a stop pin which can pass through a transverse bore of the slide, a rear support is advantageous in that, on the one hand, access to the rear side of the slide from outside is very good and, on the other hand, the design of the support can be kept simple in structural terms .
In this case, it is conceivable, for example, that the support is taken over by a ram which is led up to the slide from outside. A further simplification would be that the drive means of the slide at the same time affords the support.
In a preferred development of the device according to the invention, as claimed in claim 5, the drive means is an oblique tension column which is fixed in the upper die and projects obliquely downward toward the lower die, the column being inclined toward the forming space. The slide in this case has a reception bore, the run of which corresponds to the oblique extent of the column and which is arranged with respect to the column such that the latter penetrates into the reception bore during the movement of closing the forming tool.
Although the drive means may have a pneumatic or hydraulic basis, a mechanical solution is preferred here, since it is far less complicated in terms of apparatus. In this case, of course, it is conceivable that the mechanical drive means is, for example, a ram which, with regard to the internal high- pressure forming tool, constitutes a separate component and possesses a separate control. However, with the proposed oblique tension column which is integrated into the forming tool and which penetrates into a reception bore of the slide during the closing movement, the slide is displaced in a structurally simple way between a position of non-use and a position of use solely as a result of the movement of closing or opening the forming tool, so that separate controls and the energy sources necessary for these may be dispensed with so as to achieve a saving in outlay and in resources. In order to bring about the automatic movement of the slide, however, the oblique tension column must be arranged so as to be inclined obliquely toward the forming space and the reception bore of the slide must be coordinated with the oblique run of the column. As a result of the movement of penetration or extraction of the guide column into or out of the reception bore, the column acts upon the slide according ~ to the wedge principle, so that the slide is moved by positive control. For an ordered displacement of the slide, it is in this case beneficial if the slide is guided laterally. It may be stressed once more, at this juncture, that, in said embodiment of the invention as claimed in claim 5, by the function of the drive means for the slide being transferred to the forming tool, the outlay in terms of apparatus for the device is reduced considerably and there is a saving in construction space for the device.
In a further preferred embodiment of the invention, as claimed in claim 6, the supporting means is the upper die which engages behind the slide in the closed position of the forming tool. By the supporting function of the slide being taken over by the forming tool, separate supporting means may be dispensed with, thus leading to a structural simplification of the device, and the outlay in terms of apparatus and in terms of control can be reduced.
In a further preferred embodiment of the invention, as claimed in claim 7, the upper die has, in its region engaging behind the slide, a wedge surface, the angular position of which corresponds to the angle of slope of the oblique tension column and which, in the closed position of the forming tool, bears against an identically angled wedge surface formed on the rear side of the slide. By a wedge surface being arranged in that region of the upper die in which the latter engages behind the slide and by the wedge surface bearing, in the closed position, against a wedge surface which is formed on the rear side of the slide, there is no risk of jamming between the slide and the upper die of the forming tool. Furthermore, the wear between the wedge surfaces, that is to say between the upper die and the slide on its rear side, is minimized.
In a further preferred development of the invention, as claimed in claim 8, a sliding plate, against which the upper die bears with its region engaging behind the slide, is arranged on the rear side of the slide. By the rear side of the slide having arranged on it a sliding plate which, moreover, may also alternatively be fastened to the wedge surface of the upper die, the friction between the upper die and the slide and therefore the wear between the two is minimized.
The invention is explained in more detail below by means of an exemplary embodiment illustrated in the drawing.
In this case, the figure shows, in a lateral longitudinal section, a device according to the invention with an oblique tension column as drive means of a slide and with an upper die, designed as supporting means, of a forming tool of the device, the figure being split in the illustration into an opening position of the forming tool (on the left) and a closed position of the forming tool (on the right).
The figure illustrates a device 1 for producing a peripherally closed hollow profiled element by means of fluidic internal high pressure, said device containing an internal high-pressure forming tool 2. The latter is composed of an upper die 3 and of a lower die 4, the impressions 5 and 6 of which enclose a forming space 7 for the hollow profiled element. The forming space 7 has inserted into it a hollow profiled element blank 8, the diameter of which is larger than that of the forming space 7. The device 1 comprises, furthermore, a member for pressing the blank 8 in the internal high-pressure forming tool 2, the member being formed by two slides 9 which are seated on the lower die 4 of the internal high-pressure forming tool 2 on the right and left laterally with respect to the hollow profiled element blank 8. Furthermore, the device 1 also contains a fluid high-pressure generation system which is fluidically connected at least to one end of the hollow profiled element blank 8. The underside 10 of the upper die 3 has worked into it oblique bores 11, in which oblique tension columns 12 are arranged and fixed. The oblique tension columns 12, one of which is assigned in each case to a slide 9, project obliquely downward toward the lower die 4, the columns 12 being inclined toward the forming space 7. The oblique tension columns 12 in each case form the drive means for the slide 9, by means of which the slide 9 can be moved between a position of use and a position of non-use during the movement of opening and closing the forming tool 2. The slide 9 has, for this purpose, a reception bore 13 , the run of which corresponds to the oblique extent of the column 12. The reception bore 13 is arranged in relation to the oblique tension column 12 such that the latter penetrates into the reception bore 13 during the movement of closing the forming tool
2. The upper die 3 has, furthermore, on its underside 10, clearances 14, in which the slides are received during the movement of closing the forming tool 2 and in the closed position of the latter. The clearances 14 are open toward the forming space 7 and on the opposite side possess a flank 15 which is designed as a wedge surface. The angular position of the wedge surface corresponds exactly to that of the angle of slope of the oblique tension column 12. On the rear side 16 of the slide 9, said rear side facing away from the forming space 7, a wedge surface 17 is likewise formed, which is angled identically to the wedge surface of the upper die 3. A sliding plate 18 is fastened to this wedge surface 17.
To produce the hollow profiled element, the circular-cylindrical hollow profiled element blank 8, the diameter of which has a continuous oversize, as compared with the diameter of the forming space 7, is inserted into the depression-like impression 6 of the lower die 4, said impression forming a lower portion of the forming space 7. Subsequently, the upper die 3 moves toward the lower die 4, the oblique tension columns 12, which possess an introduction phase at their free end 19, penetrating into the reception bores 13 of the slides 9. On account of the resulting wedging action between the columns 12 and the slide 9, the latter is moved on the lower die 4 onto the tubular hollow profiled element blank 8 transversely with respect to the direction of the closing movement of the forming tool 2. During the movement of closing the forming tool, the slide 9 assumes a position of use upon contact with the blank 8. The hollow profiled element blank 8 which has hitherto remained unformed is pressed together by the pressing surface 21, acting on it, of the slide 9, with the result that the blank assumes a preprofiled intermediate form 22 which has a rough contour approximating to the contour of the about rectangular forming space 7. In the final phase of the movement of closing the upper die 3, the impression 5 of the latter acts upon an upper region of the hollow profiled element blank 8 and presses this upper region inward until the forming space 7 is closed completely.
In the closed position of the forming tool 2, the pressing surface 21 of the slide 9 forms the impression which delimits the forming space 7 laterally. This may, depending on the design of the slide 9, be a local boundary or a boundary which is extended virtually over the entire longitudinal extent of the hollow profiled element blank 8. In the closed position of the forming tool 2, the underside 10 of the upper die 3 lies on the top side 23 of the slide 9. At the same time, the slide 9 is held outwardly, on its rear side 16, by the flank of the clearance 14 of the upper die 3. The flank 15 of the upper die 3 in this case engages behind the rear side 16 of the slide 9 and bears against the sliding plate 18 of the slide 9. The rear support of the slide 10 9 by that region of the upper die 3 which engages behind said slide and is designed as a flank 15 is, however, necessary in that, during the subsequent internal high-pressure forming of the intermediate form 22 of the hollow profiled element, the slide 9 is not 15 driven outward and therefore the forming space 7 is not opened laterally, the result of which would be that the hollow profiled element blank 8 would expand laterally outward out of the forming space 7 in an undesirable way.
A fluidic internal high pressure is then generated within the intermediate form 22 of the hollow profiled element blank 8 via the fluid high-pressure generation system, after which the intermediate form 22 is formed by expansion into the final form of the hollow profiled element. In this case, those regions 24 of the blank 8 which were still just spaced apart from the blank 8 in the intermediate form 22 of the latter also come to bear against the impressions 5, 6 and 21. Moreover, it is also conceivable that the hollow profiled element blank 8 is filled with pressure fluid even before the pressing operation by the slide 9, thus leading, during the pressing operation, to an internal support of the blank 8. This internal support additionally counteracts a creasing of the hollow profiled element blank 8 during the pressing operation and thus also contributes to the high degree of process reliability of the forming operation and therefore to the desired formation of the hollow profiled element.
After the forming of the hollow profiled element blank 8 into the desired final form of the hollow profiled element has taken place, the pressure fluid within the hollow profiled element is depressurized and the forming tool 2 is opened. In this case, the upper die 3 is moved away from the lower die 4, the flank 15 sliding along, free of jamming, on the sliding plate 18 of the slide 9. At the same time, as a result of the wedging action which the tension column 12 exerts on the slide 9, the latter is moved into a position of non-use outwardly away from the forming space 7 and transversely with respect to the direction of movement of the upper die 3. After the opening of the forming tool 2, the ready-formed hollow profiled element can then be extracted from the tool 2.
To produce the hollow profiled element, the circular-cylindrical hollow profiled element blank 8, the diameter of which has a continuous oversize, as compared with the diameter of the forming space 7, is inserted into the depression-like impression 6 of the lower die 4, said impression forming a lower portion of the forming space 7. Subsequently, the upper die 3 moves toward the lower die 4, the oblique tension columns 12, which possess an introduction phase at their free end 19, penetrating into the reception bores 13 of the slides 9. On account of the resulting wedging action between the columns 12 and the slide 9, the latter is moved on the lower die 4 onto the tubular hollow profiled element blank 8 transversely with respect to the direction of the closing movement of the forming tool 2. During the movement of closing the forming tool, the slide 9 assumes a position of use upon contact with the blank 8. The hollow profiled element blank 8 which has hitherto remained unformed is pressed together by the pressing surface 21, acting on it, of the slide 9, with the result that the blank assumes a preprofiled intermediate form 22 which has a rough contour approximating to the contour of the about rectangular forming space 7. In the final phase of the movement of closing the upper die 3, the impression 5 of the latter acts upon an upper region of the hollow profiled element blank 8 and presses this upper region inward until the forming space 7 is closed completely.
In the closed position of the forming tool 2, the pressing surface 21 of the slide 9 forms the impression which delimits the forming space 7 laterally. This may, depending on the design of the slide 9, be a local boundary or a boundary which is extended virtually over the entire longitudinal extent of the hollow profiled element blank 8. In the closed position of the forming tool 2, the underside 10 of the upper die 3 lies on the top side 23 of the slide 9. At the same time, the slide 9 is held outwardly, on its rear side 16, by the flank of the clearance 14 of the upper die 3. The flank 15 of the upper die 3 in this case engages behind the rear side 16 of the slide 9 and bears against the sliding plate 18 of the slide 9. The rear support of the slide 10 9 by that region of the upper die 3 which engages behind said slide and is designed as a flank 15 is, however, necessary in that, during the subsequent internal high-pressure forming of the intermediate form 22 of the hollow profiled element, the slide 9 is not 15 driven outward and therefore the forming space 7 is not opened laterally, the result of which would be that the hollow profiled element blank 8 would expand laterally outward out of the forming space 7 in an undesirable way.
A fluidic internal high pressure is then generated within the intermediate form 22 of the hollow profiled element blank 8 via the fluid high-pressure generation system, after which the intermediate form 22 is formed by expansion into the final form of the hollow profiled element. In this case, those regions 24 of the blank 8 which were still just spaced apart from the blank 8 in the intermediate form 22 of the latter also come to bear against the impressions 5, 6 and 21. Moreover, it is also conceivable that the hollow profiled element blank 8 is filled with pressure fluid even before the pressing operation by the slide 9, thus leading, during the pressing operation, to an internal support of the blank 8. This internal support additionally counteracts a creasing of the hollow profiled element blank 8 during the pressing operation and thus also contributes to the high degree of process reliability of the forming operation and therefore to the desired formation of the hollow profiled element.
After the forming of the hollow profiled element blank 8 into the desired final form of the hollow profiled element has taken place, the pressure fluid within the hollow profiled element is depressurized and the forming tool 2 is opened. In this case, the upper die 3 is moved away from the lower die 4, the flank 15 sliding along, free of jamming, on the sliding plate 18 of the slide 9. At the same time, as a result of the wedging action which the tension column 12 exerts on the slide 9, the latter is moved into a position of non-use outwardly away from the forming space 7 and transversely with respect to the direction of movement of the upper die 3. After the opening of the forming tool 2, the ready-formed hollow profiled element can then be extracted from the tool 2.
Claims (8)
1. A method for producing a peripherally closed hollow profiled element by means of fluidic internal high pressure, a hollow profiled element blank, the diameter of which has an oversize, as compared with the diameter of a forming space of an internal high-pressure forming tool, being introduced into the forming space, the blank being pressed in the internal high-pressure forming tool into an intermediate form having a rough contour approximating to the contour of the forming space, and the blank preprofiled in this way being formed into the final form of the hollow profiled element by means of internal high pressure, characterized in that the hollow profiled element blank (8) is inserted, unformed, into a depression-like impression (6) of the lower die (4) of the forming tool (2), said impression forming a lower portion of the forming space (7), and in that, during the movement of closing the forming tool (2), the hollow profiled element blank (8) is pressed into the intermediate form (22) by means of at least one slide (9) moveable transversely with respect to the closing movement of the forming tool (2).
2. A device for producing a peripherally closed hollow profiled element by means of fluidic internal high pressure, with an internal high-pressure forming tool which contains an upper die and a lower die and the impressions of which enclose a forming space for the hollow profiled element, the forming space having a diameter which is smaller than that of the hollow profiled element blank to be introduced into the forming space, with a member for pressing the blank in the internal high-pressure forming tool into an intermediate form having a rough contour approximating to the contour of the forming space, and with a fluid high-pressure generation system, by means of which the blank preprofiled in this way assumes the final form of the hollow profiled element by means of internal high pressure, characterized in that the member for producing a rough contour is at least one slide (9) which is connected to a drive means by means of which, during the movement of opening or closing the forming tool (2), the slide (9) can be moved between a position of use and a position of non-use transversely with respect to the direction of movement of the forming tool (2), the slide (9) assuming a position of use during the movement of closing the forming tool (2).
3. The device as claimed in claim 2, characterized in that the pressing surface (21) of the slide (9) forms an impression which at least partially delimits the forming space (7) laterally.
4. The device as claimed in either one of claims 2 and 3, characterized in that, during the internal high-pressure forming of the blank (8) into the final form, the slide (9) is held at the rear by a supporting means.
5. The device as claimed in one of claims 2 to 4, characterized in that the drive means is an oblique tension column (12) which is fixed in the upper die (3) and projects obliquely downward toward the lower die (4), the column (12) being inclined toward the forming space (7), and in that the slide (9) has a reception bore (13), the run of which corresponds to the oblique extent of the column (12) and which is arranged with respect to the column (12) such that the latter penetrates into the reception bore (13) during the movement of closing the forming tool (2).
6. The device as claimed in either one of claims 4 and 5, characterized in that the supporting means is the upper die (3) which engages behind the slide (9) in the closed position of the forming tool (2).
7. The device as claimed in claim 6, characterized in that the upper die (3) has, in its region engaging behind the slide (9), a wedge surface (15), the angular position of which corresponds to the angle of slope of the oblique tension column (12) and which, in the closed position of the forming tool (2), bears against an identically angled wedge surface (17) formed on the rear side (16) of the slide (9).
8. The device as claimed in either one of claims 6 and 7, characterized in that a sliding plate (18), against which the upper die (3) bears with its region engaging behind the slide (9), is arranged on the rear side (16) of the slide (9).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2003142930 DE10342930B4 (en) | 2003-09-17 | 2003-09-17 | Method and device for producing a circumferentially closed hollow profile |
| DE10342930.1 | 2003-09-17 | ||
| PCT/EP2004/009138 WO2005035161A1 (en) | 2003-09-17 | 2004-08-14 | Method and device for producing a peripherally closed hollow profiled element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2539332A1 true CA2539332A1 (en) | 2005-04-21 |
Family
ID=34305835
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002539332A Abandoned CA2539332A1 (en) | 2003-09-17 | 2004-08-14 | Method and device for producing a peripherally closed hollow profiled element |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1663538A1 (en) |
| CA (1) | CA2539332A1 (en) |
| DE (1) | DE10342930B4 (en) |
| WO (1) | WO2005035161A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102005055237B4 (en) * | 2005-11-19 | 2010-08-26 | Daimler Ag | Device for fixing a bearing in a housing |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE69403722T2 (en) * | 1993-04-19 | 1997-09-25 | Gen Motors Corp | Process for forming a tubular element |
| DE19518252C2 (en) * | 1995-05-18 | 1997-05-22 | Schaefer Maschbau Wilhelm | Method and device for producing a metal downpipe using the hydroforming process |
| US6209372B1 (en) * | 1999-09-20 | 2001-04-03 | The Budd Company | Internal hydroformed reinforcements |
| US6257035B1 (en) * | 1999-12-15 | 2001-07-10 | Ti Corporate Services Limited | Compressive hydroforming |
| DE10038717C1 (en) * | 2000-08-09 | 2001-07-19 | Daimler Chrysler Ag | Hollow profile channel formation method e.g. for automobile component, uses high pressure forming tool for deforming hollow profile wall around adjacent body which is subsequently removed |
-
2003
- 2003-09-17 DE DE2003142930 patent/DE10342930B4/en not_active Expired - Fee Related
-
2004
- 2004-08-14 WO PCT/EP2004/009138 patent/WO2005035161A1/en not_active Application Discontinuation
- 2004-08-14 EP EP04764130A patent/EP1663538A1/en not_active Withdrawn
- 2004-08-14 CA CA002539332A patent/CA2539332A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| DE10342930A1 (en) | 2005-04-14 |
| DE10342930B4 (en) | 2005-09-15 |
| WO2005035161A1 (en) | 2005-04-21 |
| EP1663538A1 (en) | 2006-06-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5528815A (en) | Clinching tool for sheet metal joining | |
| JP4086216B2 (en) | Hydroforming method of pipe material | |
| US5865054A (en) | Apparatus and method for forming a tubular frame member | |
| US5979201A (en) | Hydroforming die assembly for pinch-free tube forming | |
| US5239852A (en) | Apparatus and method for forming a tubular frame member | |
| US7596983B2 (en) | Press brake clamp incorporating tool-seating mechanism | |
| US8091201B2 (en) | Stamped tubular member and method and apparatus for making same | |
| GB2319487A (en) | Hydroforming apparatus having in-die piercing capabilities and slug ejection using hydroforming fluid | |
| US10112230B2 (en) | Method for making joints between sheet formed members and an apparatus for carrying out said method | |
| EA001975B1 (en) | Method and apparatus for hydroforming an angled tubular part without inhibiting wrinkles formation | |
| NO173978B (en) | PROCEDURE AND APPARATUS FOR THE FORMATION OF CASH-LIKE FRAME COMPONENTS | |
| DD294438A5 (en) | METHOD AND DEVICE FOR DEFLECTING MATERIALS | |
| US20030046966A1 (en) | Plural sheet superplastic forming equipment and process | |
| CA2539332A1 (en) | Method and device for producing a peripherally closed hollow profiled element | |
| JPS6272441A (en) | Method and apparatus for connecting plate by punch pin | |
| CA2491358A1 (en) | Method and device for securing components on peripherally closed hollow profiles | |
| US2960763A (en) | Method of forging with thin webs | |
| US20100319428A1 (en) | Method for hydroforming hollow profile metal workpieces | |
| EP1531036A1 (en) | Method and apparatus for wrapping flexible materials | |
| US6081995A (en) | Belt Fastener installation Apparatus | |
| DE19832142C2 (en) | Method and device for producing a hollow body from two boards | |
| KR101314353B1 (en) | Multipart punch for hydro piercing | |
| US20070277573A1 (en) | Hydroforming Using High Pressure Pulsation During Fluid Intensification Cycle | |
| US6955070B2 (en) | Device for punching work pieces in an internal high-pressure forming tool | |
| JPH0225224A (en) | Opposed hydraulic forming device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |