CN114472666A - Forming device and method for tubular hydroforming front fender support - Google Patents
Forming device and method for tubular hydroforming front fender support Download PDFInfo
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- CN114472666A CN114472666A CN202011266297.8A CN202011266297A CN114472666A CN 114472666 A CN114472666 A CN 114472666A CN 202011266297 A CN202011266297 A CN 202011266297A CN 114472666 A CN114472666 A CN 114472666A
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- 238000000034 method Methods 0.000 title claims description 36
- 238000007667 floating Methods 0.000 claims abstract description 45
- 238000007789 sealing Methods 0.000 claims abstract description 11
- 238000005452 bending Methods 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 6
- 230000000712 assembly Effects 0.000 claims description 2
- 238000000429 assembly Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 238000000465 moulding Methods 0.000 description 4
- 238000004080 punching Methods 0.000 description 4
- 208000027418 Wounds and injury Diseases 0.000 description 3
- 230000006378 damage Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 208000014674 injury Diseases 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- 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
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- 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
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- 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
- B21D53/00—Making other particular articles
- B21D53/88—Making other particular articles other parts for vehicles, e.g. cowlings, mudguards
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Abstract
The invention discloses a forming device for tubular hydroforming a front fender support, which comprises a preforming assembly, a hydroforming assembly and a hydroforming device. The preforming upper die of the preforming assembly is connected with the preforming press so as to move towards the preforming lower die under the driving of the preforming press; the upper hydroforming die of the hydroforming assembly is connected with a hydroforming machine so as to move towards the lower hydroforming die under the driving of the hydroforming machine; the upper hydroforming die includes: hydroforming an upper die base; the upper die end part floating insert blocks are arranged at the end parts of the two ends of the upper die base for hydraulic forming; the upper die middle insert is arranged between the upper die end floating inserts; the upper die end floating insert driving element is connected with the upper die end floating insert so as to drive the upper die end floating insert to protrude or retract relative to the upper die middle insert; the first end sealing assembly and the second end sealing assembly can seal two ends of the hydraulic forming pipe when the upper die end floating insert is contacted with the hydraulic forming lower die.
Description
Technical Field
The present invention relates to a forming apparatus and method, and more particularly, to a hydroforming apparatus and method.
Background
In the aircraft, spacecraft and automotive field, weight reduction to save materials and energy consumption in operation is one of the trends in the development of modern manufacturing techniques. Hydroforming is an advanced manufacturing technique for manufacturing hollow lightweight structural members under such a background, which not only can meet the requirement of lightweight manufacturing of parts, but also can manufacture tubular automobile front fender support parts with different cross-sectional structures according to different positions in order to meet the requirement of the appearance of an automobile on the shape.
The automobile front fender supporting piece is an indispensable part of a fender assembly, is connected with a front fender of an automobile and is matched with parts such as an engine hood, a shock absorption tower, a front bumper, an automobile door, a side wall and the like. The fender is the outward appearance part of car, needs fender support piece to provide mounted position and support to different figurative fenders to improve the rigidity of fender assembly, promote car biasing collision performance, the injury that causes the personnel after the better reduction car collision.
Compared with a tubular hydroformed front fender support, the conventional fender support is usually processed by punching a plate at present. For example: chinese patent publication No. CN101700788A, publication No. 5/2010, entitled "a fender mounting structure", discloses a fender mounting structure including a fender support member that is a fender beam, which is a plate stamped part.
The conventional sheet punched fender supports in the prior art still have many defects, and are often formed by welding a plurality of punched parts, and the requirements of rigidity performance, high offset collision performance and support of complex fender modeling design of parts cannot be met while the light weight of an automobile is met.
Based on the above, the present invention is directed to a forming device and method for a tubular hydroformed front fender support, which can meet the requirement of light weight of automobile parts, and also meet the requirements of rigidity performance, high offset collision performance and support of complex fender shape design.
Disclosure of Invention
One of the objects of the present invention is to provide a forming apparatus for a tubular hydroformed front fender support, by which a tubular hydroformed front fender support can be effectively produced which can satisfy the requirement of lightweight of automobile parts, and can satisfy the performance of rigidity, high offset collision performance, and the requirement of supporting the design of a complicated fender shape. The problem of traditional panel punching press fender support piece part quantity many, spatial layout is difficult, the cooperation fender molding degree of difficulty is high and lightweight effect is obscure is solved.
In order to achieve the above object, the present invention proposes a forming device for tubular hydroforming a front fender support, comprising a preforming assembly, a hydroforming assembly and a hydroforming means;
wherein the preform assembly comprises: a preforming upper die and a preforming lower die; the preforming upper die is connected with the preforming press so as to move towards the preforming lower die in the preforming process under the driving of the preforming press;
wherein the hydroforming assembly comprises: a hydroforming top die, a hydroforming bottom die, a first end seal assembly, and a second end seal assembly; the upper hydroforming die is connected with a hydroforming machine and driven by the hydroforming machine to move towards the lower hydroforming die in the hydroforming process; wherein the upper hydroforming die comprises:
hydroforming an upper die base;
the upper die end part floating insert blocks are arranged at the two end parts of the hydraulic forming upper die base;
the upper die middle insert is arranged between the upper die end floating inserts;
the upper die end floating insert driving element is connected with the upper die end floating insert so as to drive the upper die end floating insert to protrude or retract relative to the upper die middle insert;
wherein the first and second end seal assemblies are configured to: when the upper die end floating insert is in contact with the hydroforming lower die, the two ends of the pipe to be hydroformed are sealed, and the hydroforming equipment establishes internal pressure inside the pipe.
In the technical scheme, in certain preferred embodiments, in the scheme, in some preferred embodiments, the upper die end floating insert driving element can adopt a nitrogen cylinder.
Further, in the molding apparatus of the present invention, the hydroforming lower die includes:
hydroforming a lower die base;
and the lower die insert is arranged on the hydroforming lower die base.
Further, in the forming apparatus of the present invention, the first end seal assembly and the second end seal assembly respectively include:
an end seal;
and the feeding cylinders are respectively connected with the end seals so as to drive the end seals to be fed to the sealing station.
Further, in the forming device of the invention, a first guide sleeve and a first guide pillar which are matched with each other are arranged between the upper hydroforming die and the lower hydroforming die.
Further, in the forming apparatus of the present invention, a second guide sleeve and a second guide post are provided between the pre-forming upper die and the pre-forming lower die, wherein the second guide sleeve and the second guide post are adapted to each other.
Further, in the forming apparatus of the present invention, the preform upper die includes:
preforming the upper die base plate;
the preforming upper die insert is arranged on the preforming upper die base plate;
the upper die resilience adjusting block is arranged on the preformed upper die base plate through a first rotating shaft perpendicular to the preformed upper die base plate;
the upper die resilience adjusting assembly applies force to the head end of the upper die resilience adjusting block to drive the upper die resilience adjusting block to rotate on the preformed upper die base plate by taking the first rotating shaft as a rotating shaft;
the upper die fixing assembly is used for fixing the upper die rebound adjusting block after the upper die rebound adjusting block finishes rotating;
the preforming lower die includes:
preforming a lower die base plate;
the preformed lower die insert is arranged on the preformed lower die base plate;
the lower die resilience adjusting block is arranged on the preformed lower die base plate through a second rotating shaft vertical to the preformed lower die base plate;
the lower die resilience adjusting assembly applies force to the head end of the lower die resilience adjusting block to drive the lower die resilience adjusting block to rotate on the preformed lower die base plate by taking the second rotating shaft as a rotating shaft;
and the lower die fixing component is used for fixing the lower die rebound adjusting block after the lower die rebound adjusting block finishes rotating.
Further, in the forming device of the invention, an end limiting block is further arranged beside the preforming lower die insert.
Accordingly, another object of the present invention is to provide a method for forming a tubular hydroformed front fender support, which is simple and convenient to operate, and is particularly suitable for hydroforming production, wherein the obtained tubular hydroformed front fender support has stable and reliable quality, can meet the requirements of light weight of automobile parts, can meet the requirements of rigidity and high offset collision performance, and can effectively support the design of complex fender shapes.
In order to achieve the above object, the present invention proposes a method of forming a tubular hydroformed front fender support, comprising the steps of:
100: making the straight pipe into a bent pipe;
200: performing the bent pipe by adopting the performing assembly of the forming device;
300: the preformed pipe is hydroformed by the hydroforming assembly of the forming device.
Further, in the forming method of the present invention, the step 200 includes:
201: placing the bent pipe in a preforming lower die, and driving a die closing process of a preforming upper die through a preforming press to obtain a preliminary preformed pipe fitting;
202: measuring an actual bending angle theta of the preliminary pre-pipe fitting, comparing the actual bending angle theta with a target angle, and adjusting the rotation angles of the upper die resilience adjusting block and the lower die resilience adjusting block according to a comparison result;
steps 201 and 202 are repeated until the actual bending angle θ of the preliminary pre-pipe coincides with the target angle, and the preliminary pre-formed pipe obtained at this time is taken as the pre-formed pipe entering step 300.
Further, in the forming method of the present invention, the step 300 includes:
301: placing the preformed tube into a hydroforming lower die;
302: in the standing state of the upper hydroforming die, the upper die end floating insert driving element drives the upper die end floating insert to float out of the profile of the upper die middle insert by a preset distance L, and the initial pressure of the upper die end floating insert driving element is F1;
303: the hydraulic forming press drives the whole hydraulic forming upper die to press downwards until the floating insert at the end part of the upper die is contacted with the hydraulic forming lower die, at the moment, the first end part sealing assembly and the second end part sealing assembly seal two end parts of a preformed pipe fitting to be subjected to hydraulic forming, and the hydraulic forming equipment injects pressure liquid into the preformed pipe fitting so as to establish a first internal pressure P1 in the preformed pipe fitting and keep the pressure for a first time;
304: when the mold closing pressure F2 of the upper hydroforming mold and the lower hydroforming mold is larger than F1, the floating insert at the end part of the upper mold retracts to the bottom, and the upper hydroforming mold and the lower hydroforming mold are completely closed;
305: the hydroforming equipment injects pressure liquid into the preformed pipe fitting to establish a second internal pressure P2 in the preformed pipe fitting and keep the pressure for a second time, so that the outer surface of the pipe fitting is attached to the cavity of the hydroforming assembly; wherein P2 is greater than P1;
306: and releasing the pressure and opening the hydroforming assembly to hydroform the tube.
Further, in the forming method, the P1 is 20-50 MPa, and the first time is 1-30 s; and/or P2 is 100-180 MPa, and the second time is 1-10 s.
Compared with the prior art that the fender supporting piece is punched and processed by plates, the technical scheme of the invention designs the forming device of the tubular hydraulic forming front fender supporting piece through the structure of the optimizing device. By adopting the forming device, the tubular hydroformed front fender support can be effectively manufactured, which can meet the requirement of light weight of automobile parts, and can also meet the performance of rigidity, high offset collision performance and the requirement of supporting the design of complex fender shapes. The problem of traditional panel punching press fender support piece part quantity many, spatial layout is difficult, the cooperation fender molding degree of difficulty is high and lightweight effect is obscure is solved.
The tubular hydroformed front fender support piece produced by the method can provide mounting positions and supports for fenders with different shapes, improves the rigidity of a fender assembly, and improves the offset collision performance of an automobile, so that the injury to personnel caused by the collision of the automobile is reduced better, and the tubular hydroformed front fender support piece has good popularization prospect and application value.
Drawings
Fig. 1 is a schematic view of a hydroforming top mold of a hydroforming assembly in accordance with one embodiment of a tubular hydroforming front fender support forming apparatus of the present invention.
Fig. 2 is a schematic view of a hydroforming lower die of a hydroforming assembly of a tubular hydroforming front fender support forming apparatus according to an embodiment of the present invention.
Fig. 3 is a schematic view of a preforming upper die of a preforming assembly in one embodiment of the forming apparatus for a tubular hydroformed front fender support according to the present invention.
Fig. 4 is a schematic view of a lower preform mold of a preform assembly in an embodiment of the apparatus for forming a tubular hydroformed front fender support according to the present invention.
Fig. 5 is a top view of a lower preform mold of a preform assembly in accordance with one embodiment of the apparatus for forming a tubular hydroformed front fender support of the present invention.
Figure 6 schematically shows a schematic view of a tubular hydroformed front fender support spring back.
Fig. 7 shows a schematic view of a curved pipe formed by the method of forming a tubular hydroformed front fender support according to the present invention.
Figure 8 shows a schematic view of a preformed tube formed using the method of forming a tubular hydroformed front fender support according to the present invention.
Fig. 9 shows a schematic view of a tubular hydroformed front fender support formed using the method of forming a tubular hydroformed front fender support according to the present invention.
Detailed Description
The device and method for hydroforming a front fender support according to the invention will be further explained and illustrated with reference to the drawings and the specific examples of the present application, which, however, should not be construed as unduly limiting the technical solution of the invention.
According to the technical scheme, the forming device for the tubular hydraulic forming front fender supporting piece is designed by optimizing the structure of the device. In the present invention, the forming device for tubular hydroforming a front fender support according to the present invention may include: a preform assembly, a hydroforming assembly and a hydroforming apparatus (not shown).
When the forming device is used for manufacturing the tubular hydroformed front fender support, the preforming assembly of the forming device can complete the preforming treatment on the pipe fitting to obtain a preformed pipe fitting (as shown in figure 8); accordingly, the hydroforming assembly of the apparatus can further hydroform the preformed tube to provide a tubular hydroformed front fender support (as shown in fig. 9).
Fig. 1 is a schematic view of a hydroforming top mold of a hydroforming assembly in accordance with one embodiment of a tubular hydroforming front fender support forming apparatus of the present invention.
Fig. 2 is a schematic view of a hydroforming lower die of a hydroforming assembly of a tubular hydroforming front fender support forming apparatus according to an embodiment of the present invention.
As can be seen by referring to fig. 1 and 2 in combination, in the present embodiment, the hydroforming assembly of the forming apparatus of the present invention may include: a hydroforming top die 1, a hydroforming bottom die 2, a first end seal assembly 3, and a second end seal assembly 4.
In the forming apparatus of the present invention, the upper hydroforming die 1 can be connected to a hydroforming machine (not shown in the drawings), and can be moved toward the lower hydroforming die 2 during hydroforming by the hydroforming machine.
As shown in fig. 1, in the hydroforming assembly according to the present invention, the upper hydroforming die 1 may include: hydroforming upper die base 11, upper die end floating insert 12, upper die middle insert 13 and upper die end floating insert driving elements (not shown in the figure). The upper die end floating inserts 12 are arranged at the two end parts of the upper die base 11 for hydroforming; the upper die middle insert 13 is arranged between the upper die end floating inserts 12; the upper die end floating insert driving element is connected with the upper die end floating insert 12 and can drive the upper die end floating insert 12 to protrude or retract relative to the upper die middle insert 13.
Correspondingly, also included in the hydroforming assembly are a first end seal assembly 3 and a second end seal assembly 4 arranged: when the upper die end floating insert 12 contacts the hydroforming lower die 2, the two ends of the pipe to be hydroformed are sealed, thereby ensuring that the hydroforming equipment in the forming device of the present invention builds up internal pressure inside the pipe.
As shown in fig. 2, in the present embodiment, each of the first end seal assembly 3 and the second end seal assembly 4 may include: an end seal 5 and a feed cylinder 6. Wherein a feed cylinder 6 is connected with the end seal 5, the feed cylinder 6 can drive the end seal 5 to feed to the sealing station.
With continuing reference to FIG. 2 and with further reference to FIG. 1, in this embodiment, the hydroforming die 2 of the hydroforming assembly of the present invention may include: the lower die base 21 and the lower die insert 22 are hydroformed. Wherein the lower die insert 22 is provided on the hydroforming lower die base 21.
In addition, in the present embodiment, the upper hydroforming die 1 and the lower hydroforming die 2 of the forming apparatus according to the present invention have a first guide bush 7 and a first guide post 8 fitted to each other. When the upper hydroforming die 1 moves towards the lower hydroforming die 2 in the hydroforming process, the first guide sleeve 7 and the first guide pillar 8 can be matched with each other.
Fig. 3 is a schematic view of a preforming upper die of a preforming assembly in one embodiment of the forming apparatus for a tubular hydroformed front fender support according to the present invention.
Fig. 4 is a schematic view of a lower preform mold of a preform assembly in an embodiment of the apparatus for forming a tubular hydroformed front fender support according to the present invention.
Fig. 5 is a top view of a lower preform mold of a preform assembly in accordance with one embodiment of the apparatus for forming a tubular hydroformed front fender support of the present invention.
As shown in fig. 3, 4 and 5, in the forming apparatus of the present invention, the preform assembly may include a preform upper die 9 and a preform lower die 10. The preforming upper die 9 may be connected to a preforming press (not shown) to move toward the preforming lower die 10 during preforming by the preforming press.
In the present embodiment, a second guide bush 14 and a second guide post 15 are provided between the preforming upper die 9 and the preforming lower die 10 so as to be fitted to each other. The second guide sleeve 14 and the second guide post 15 can be adapted to each other when the preforming upper die 9 is moved towards the preforming lower die 10 during preforming.
As shown in fig. 3, in the present embodiment, the preforming upper die 9 includes: a preformed upper die base plate 91, a preformed upper die insert 92, an upper die rebound adjusting block 93, an upper die rebound adjusting assembly (not shown) and an upper die fixing assembly (not shown). Wherein, the preforming upper die insert 92 is arranged on the preforming upper die base plate 91; the upper die rebound adjustment block 93 may be provided on the pre-formed upper die base plate 91 by a first rotation shaft (not shown in the drawings) perpendicular to the pre-formed upper die base plate 91; an upper die rebound adjusting assembly (not shown in the drawing, which has a similar structure to that of the lower die rebound adjusting assembly described below) capable of applying a force to the head end of the upper die rebound adjusting block 93, thereby driving the upper die rebound adjusting block 93 to rotate on the preformed upper die base plate 91 about a first rotating shaft (not shown in the drawing, which has a similar structure to that of the second rotating shaft described below); the upper die fixing assembly ((not shown in the drawing, which has a similar structure to the lower die fixing assembly described below)) may fix the upper die rebound adjusting block 93 after it has completed its rotation.
Accordingly, as shown in fig. 4 and 5, in the present embodiment, the preforming lower die 10 includes: a preformed lower die base plate 101, a preformed lower die insert 102, a lower die rebound adjusting block 103, a lower die rebound adjusting assembly 104 and a lower die fixing assembly 105. Wherein, the preforming lower die insert 102 is arranged on the preforming lower die base plate 101; the lower die resilience adjusting block 103 is arranged on the preformed lower die base plate 101 through a second rotating shaft 106 perpendicular to the preformed lower die base plate 101; the lower die rebound adjusting assembly 104 can apply a force to the head end of the lower die rebound adjusting block 103 to drive the lower die rebound adjusting block 103 to rotate on the preformed lower die base plate 101 by taking the second rotating shaft 106 as a rotating shaft; the lower die fixing assembly 105 may fix the lower die rebound adjusting block 103 after it is rotated.
In this embodiment, the upper die rebound adjusting assembly and the lower die rebound adjusting assembly 104 may be screws, and an operator may adjust and adjust the angle of the pipe in the preforming step by rotating the screws to adjust the rotation angles of the upper die rebound adjusting block 93 and the lower die rebound adjusting block 103.
In addition, as can be seen from further referring to fig. 4, in this embodiment, an end stopper 107 is further disposed beside the preformed lower die insert 102 in the forming apparatus according to the present invention, and may be used to limit the position of the preformed lower die insert 102 for hydroforming the front fender on the preformed lower die base plate 101, so as to prevent the preformed lower die insert 102 from displacing and moving on the preformed lower die base plate 101.
Figure 6 schematically shows a schematic view of the tubular support springback.
As shown in fig. 6, after the pipe is preformed by the preforming component in the forming device of the present invention, a preliminary preformed pipe can be obtained. It is important to note that the preformed tube produced may spring back, resulting in the actual bend angle θ of the actual preformed tube being different from the desired target angle.
Therefore, the upper die rebound adjusting assembly and the lower die rebound adjusting assembly 104 are respectively arranged in the preforming upper die 9 and the preforming lower die 10. An operator can rebound adjusting assembly and lower mould adjusting assembly 104 through adjusting last mould, mould adjusting block 93 is kick-backed in the drive and uses first pivot to rotate on preforming last mould bottom plate 91 as the axis of rotation, adjusting block 103 is kick-backed in the drive lower mould with second pivot 106 rotates on preforming lower mould bottom plate 101 as the axis of rotation, adjusting last mould adjusting block 93 and the turned angle of lower mould adjusting block 103 of kick-backing, actual bending angle theta and the target angle of pipe fitting up to preforming are unanimous, after the adjustment is accomplished, utilize last mould fixed component and the fixed 105 fixed position of lower mould to guarantee production quality.
Fig. 7 shows a schematic view of a curved pipe formed by the method of forming a tubular hydroformed front fender support according to the present invention.
Figure 8 shows a schematic view of a preformed tube formed using the method of forming a tubular hydroformed front fender support according to the present invention.
Fig. 9 shows a schematic view of a tubular hydroformed front fender support formed using the method of forming a tubular hydroformed front fender support according to the present invention.
In the present invention, the above-described apparatus for forming a tubular hydroformed front fender support according to the present invention can be used to carry out the method for forming a tubular hydroformed front fender support according to the present invention.
As can be seen by referring to fig. 7, 8 and 9 in combination, in the present invention, a tubular hydroformed front fender support can be efficiently produced using the apparatus for forming a tubular hydroformed front fender support according to the present invention.
A method of forming a tubular hydroformed front fender support according to the present invention is further illustrated in fig. 7, 8 and 9 with reference to fig. 1-6. The forming method of the invention can comprise the following steps:
100: forming the straight tube into a bent tube 70 as shown in fig. 7;
200: preforming the bent pipe by adopting the preforming component of the forming device for the tubular hydroformed front fender support to obtain a preformed pipe fitting 80 shown in fig. 8;
300: hydroforming a preformed tube using the hydroforming assembly of the tubular hydroformed front fender support forming apparatus of the present invention results in a fender support 90 shown in fig. 9.
In the present embodiment, a straight pipe workpiece is selected for theoretical data of a required fender support, and a bent pipe 70 is obtained by bending the straight pipe workpiece in advance by a pipe bending apparatus. The steel material selected in the step 100 of the invention can be a DP800 material, and the specification of the straight pipe is phi 88mm × 1.5mm (pipe outer diameter × wall thickness).
When the step 200 of preforming the bend using the apparatus for forming a tubular hydroformed front fender support according to the present invention may include the steps of:
201: placing the bent pipe in a preforming lower die 10, and driving a preforming upper die 9 to perform die assembly through a preforming press to obtain a preliminary preformed pipe fitting;
202: measuring an actual bending angle theta of the preliminary pre-pipe fitting, comparing the actual bending angle theta with a target angle, and adjusting the rotation angles of the upper die springback adjusting block 93 and the lower die springback adjusting block 103 according to a comparison result;
the above steps 201 and 202 are repeated until the actual bending angle θ of the preliminary pre-pipe 75 coincides with the target angle, and the preliminary pre-pipe thus obtained is taken as the pre-pipe 80 to be introduced into the subsequent step 300.
In this embodiment, the target angle in step 202 may be calculated by CAE simulation.
Accordingly, in this embodiment, when the step 300 of hydroforming a preformed tube using the apparatus for hydroforming a tubular front fender support according to the present invention may comprise:
301: placing the preformed tube 80 into the hydroformed lower die 2;
302: in a standing state of the upper hydroforming die 1, driving the upper die end floating insert driving element to drive the upper die end floating insert 12 to float out of a profile surface of the upper die middle insert 13 by a preset distance L, wherein the initial pressure of the upper die end floating insert driving element is F1;
303: the hydroforming press drives the whole upper hydroforming die 1 to press downwards until the floating insert 12 at the end part of the upper die is contacted with the lower hydroforming die 2, at the moment, the first end sealing assembly 3 and the second end sealing assembly 4 seal two end parts of a preformed pipe fitting to be hydroformed, and the hydroforming equipment injects pressure liquid into the preformed pipe fitting to establish a first internal pressure P1 in the preformed pipe fitting and keep the pressure for a first time;
304: when the clamping pressure F2 of the upper hydroforming die 1 and the lower hydroforming die 2 is more than F1, the floating insert 12 at the end part of the upper die retracts to the bottom, and the upper hydroforming die 1 and the lower hydroforming die 2 are completely clamped;
305: the hydroforming equipment injects pressure liquid into the preformed pipe fitting to establish a second internal pressure P2 in the preformed pipe fitting and keep the pressure for a second time, so that the outer surface of the pipe fitting is attached to the cavity of the hydroforming assembly; wherein P2 is greater than P1;
306: the pressure is relieved and the hydroforming assembly is opened, hydroforming the tube.
It should be noted that in the step 302, the upper die end floating insert driving element can drive the upper die end floating insert to float out of the profile surface of the upper die middle insert by a preset distance L of 10-30 mm. In the present embodiment, the upper die end floating insert driving element uses a nitrogen cylinder, and the displacement L of the die surface of the nitrogen cylinder is 20 mm.
In addition, in the forming method, the first internal pressure P1 established inside the preformed pipe fitting can be controlled to be between 20 and 50MPa, and the first time is controlled to be 1 to 30 s; correspondingly, the second internal pressure P2 established inside the preformed pipe fitting can be controlled between 100 MPa and 180MPa, and the second time can be controlled to be 1-10 s. In the present embodiment, in the above step 303, a first internal pressure P1 of 28MPa can be established inside the preformed pipe by the hydroforming equipment and kept in the low pressure state for 10 seconds; accordingly, in step 305, a second internal pressure P2 of 150MPa may be established inside the preformed tube by the hydroforming tool and maintained at the high pressure for 2 seconds to conform the outer surface of the preformed tube to the cavity of the hydroforming assembly to achieve the profile requirements of the tubular hydroformed front fender support.
In conclusion, the forming device for the tubular hydroformed front fender support can effectively manufacture the tubular hydroformed front fender support which can meet the requirements of light weight of automobile parts, rigidity performance, high offset collision performance and support of complex fender modeling design. The problem of traditional panel punching press fender support piece part quantity many, spatial layout is difficult, the cooperation fender molding degree of difficulty is high and lightweight effect is obscure is solved.
Compared with the prior art, the tubular hydroformed front fender support produced by the forming method of the tubular hydroformed front fender support can provide mounting positions and supports for fenders with different shapes, improve the rigidity of a fender assembly and improve the offset collision performance of an automobile, thereby better reducing the injury to personnel caused by the collision of the automobile, and having good popularization prospect and application value.
It should be noted that the combination of the features in the present application is not limited to the combination described in the claims of the present application or the combination described in the specific examples, and all the features described in the present application may be freely combined or combined in any manner unless contradicted by each other.
In addition, it should be noted that the above-mentioned embodiments are only specific embodiments of the present invention, and obviously, the present invention is not limited to the above-mentioned embodiments, and many similar variations exist. All modifications which would occur to one skilled in the art and which are, therefore, directly derived or suggested from the disclosure herein are deemed to be within the scope of the present invention.
Claims (11)
1. A device for hydroforming a tubular front fender support comprising a preform assembly, a hydroforming assembly and a hydroforming apparatus;
wherein the pre-forming assembly comprises: a preforming upper die and a preforming lower die; the preforming upper die is connected with the preforming press so as to move towards the preforming lower die in the preforming process under the driving of the preforming press;
wherein the hydroforming assembly comprises: a hydroforming top die, a hydroforming bottom die, a first end seal assembly, and a second end seal assembly; the upper hydroforming die is connected with a hydroforming machine and driven by the hydroforming machine to move towards the lower hydroforming die in the hydroforming process; wherein the upper hydroforming die comprises:
hydroforming an upper die base;
the upper die end part floating insert blocks are arranged at the two end parts of the hydraulic forming upper die base;
the upper die middle insert is arranged between the upper die end floating inserts;
the upper die end floating insert driving element is connected with the upper die end floating insert so as to drive the upper die end floating insert to protrude or retract relative to the upper die middle insert;
wherein the first and second end seal assemblies are configured to: when the upper die end floating insert is in contact with the hydroforming lower die, the two ends of the pipe to be hydroformed are sealed, and the hydroforming equipment establishes internal pressure inside the pipe.
2. The forming apparatus as claimed in claim 1, wherein said hydroforming lower die comprises:
hydroforming a lower die base;
and the lower die insert is arranged on the hydroforming lower die base.
3. The forming apparatus as defined in claim 1, wherein the first end seal assembly and the second end seal assembly each include:
an end seal;
and the feeding cylinders are respectively connected with the end seals so as to drive the end seals to be fed to the sealing station.
4. The forming apparatus as claimed in claim 1, wherein the upper hydroforming die and the lower hydroforming die have a first guide bush and a first guide post fitted to each other therebetween.
5. The forming device as claimed in claim 1, wherein the pre-forming upper die and the pre-forming lower die have a second guide sleeve and a second guide post fitted to each other.
6. The forming apparatus of any one of claims 1-5, wherein the pre-forming upper die comprises:
preforming the upper die base plate;
the preforming upper die insert is arranged on the preforming upper die base plate;
the upper die resilience adjusting block is arranged on the preformed upper die base plate through a first rotating shaft perpendicular to the preformed upper die base plate;
the upper die resilience adjusting assembly applies force to the head end of the upper die resilience adjusting block to drive the upper die resilience adjusting block to rotate on the preformed upper die base plate by taking the first rotating shaft as a rotating shaft;
the upper die fixing assembly is used for fixing the upper die rebound adjusting block after the upper die rebound adjusting block finishes rotating;
the preforming lower die includes:
preforming a lower die base plate;
the preformed lower die insert is arranged on the preformed lower die base plate;
the lower die resilience adjusting block is arranged on the preformed lower die base plate through a second rotating shaft vertical to the preformed lower die base plate;
the lower die resilience adjusting assembly applies force to the head end of the lower die resilience adjusting block to drive the lower die resilience adjusting block to rotate on the preformed lower die base plate by taking the second rotating shaft as a rotating shaft;
and the lower die fixing component is used for fixing the lower die rebound adjusting block after the lower die rebound adjusting block finishes rotating.
7. The forming device as claimed in claim 6, wherein an end stopper is further provided beside the preform lower die insert.
8. A method of forming a tubular hydroformed front fender support comprising the steps of:
100: making the straight pipe into a bent pipe;
200: preforming the bent tube using a preforming member of the forming apparatus according to any one of claims 1 to 7;
300: hydroforming a preformed tube using a hydroforming assembly of a forming apparatus according to any of claims 1 to 7.
9. The method of forming of claim 8, wherein said step 200 comprises:
201: placing the bent pipe in a preforming lower die, and driving a die closing process of a preforming upper die through a preforming press to obtain a preliminary preformed pipe fitting;
202: measuring an actual bending angle theta of the preliminary pre-pipe fitting, comparing the actual bending angle theta with a target angle, and adjusting the rotation angles of the upper die resilience adjusting block and the lower die resilience adjusting block according to a comparison result;
steps 201 and 202 are repeated until the actual bending angle θ of the preliminary pre-pipe coincides with the target angle, and the preliminary pre-formed pipe obtained at this time is taken as the pre-formed pipe entering step 300.
10. The forming method of claim 8 or 9, wherein the step 300 comprises:
301: placing the preformed tube into a hydroforming lower die;
302: in the standing state of the upper hydroforming die, the upper die end floating insert driving element drives the upper die end floating insert to float out of the profile of the upper die middle insert by a preset distance L, and the initial pressure of the upper die end floating insert driving element is F1;
303: the hydroforming press drives the whole hydroforming upper die to press downwards until the floating insert at the end part of the upper die is contacted with the hydroforming lower die, at the moment, the first end part sealing assembly and the second end part sealing assembly seal the two end parts of a preformed pipe fitting to be hydroformed, and the hydroforming equipment injects pressure liquid into the preformed pipe fitting so as to establish a first internal pressure P1 in the preformed pipe fitting and keep the pressure for a first time;
304: when the mold closing pressure F2 of the upper hydroforming mold and the lower hydroforming mold is larger than F1, the floating insert at the end part of the upper mold retracts to the bottom, and the upper hydroforming mold and the lower hydroforming mold are completely closed;
305: the hydroforming equipment injects pressure liquid into the preformed pipe fitting to establish a second internal pressure P2 in the preformed pipe fitting and keep the pressure for a second time, so that the outer surface of the pipe fitting is attached to the cavity of the hydroforming assembly; wherein P2 is greater than P1;
306: the pressure is relieved and the hydroforming assembly is opened, hydroforming the tube.
11. The forming method according to claim 10, wherein P1 is 20 to 50MPa, the first time is 1 to 30 s; and/or P2 is 100-180 MPa, and the second time is 1-10 s.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011266297.8A CN114472666B (en) | 2020-11-13 | 2020-11-13 | Forming device and method for tubular hydroformed front fender support |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011266297.8A CN114472666B (en) | 2020-11-13 | 2020-11-13 | Forming device and method for tubular hydroformed front fender support |
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| CN114472666B CN114472666B (en) | 2024-07-23 |
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| CN114472666B (en) | 2024-07-23 |
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