CN110227750B - Hydraulic blocking and blank pressing forming device and forming method for tailor-welded blank - Google Patents
Hydraulic blocking and blank pressing forming device and forming method for tailor-welded blank Download PDFInfo
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- CN110227750B CN110227750B CN201910400946.XA CN201910400946A CN110227750B CN 110227750 B CN110227750 B CN 110227750B CN 201910400946 A CN201910400946 A CN 201910400946A CN 110227750 B CN110227750 B CN 110227750B
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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
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/20—Deep-drawing
- B21D22/22—Deep-drawing with devices for holding the edge of the blanks
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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
- B21D24/00—Special deep-drawing arrangements in, or in connection with, presses
- B21D24/04—Blank holders; Mounting means therefor
- B21D24/08—Pneumatically or hydraulically loaded blank holders
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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
- B21D24/00—Special deep-drawing arrangements in, or in connection with, presses
- B21D24/10—Devices controlling or operating blank holders independently, or in conjunction with dies
- B21D24/14—Devices controlling or operating blank holders independently, or in conjunction with dies pneumatically or hydraulically
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
Abstract
The invention provides a hydraulic blocking and blank pressing forming device of a tailor-welded blank and a forming method thereof, the device comprises an upper die holder, a male die, a blank pressing mechanism, a hydraulic cylinder cavity and a lower die holder, the male die is fixed on the upper die holder, the hydraulic cylinder cavity is fixedly arranged on the lower die holder, the blank pressing mechanism comprises an upper blank holder, an upper blank holder fixing column and four groups of blank pressing assemblies with the same structure, each group of blank pressing assemblies comprises a blocking blank holder, a guide pillar and a piston, before forming, hydraulic oil enters the hydraulic cylinder cavity to drive the blank pressing assemblies to eject, the four blank pressing assemblies are used for clamping the tailor-welded blank, during forming, the upper die holder and the male die move downwards, a control system controls the magnitude of the blank pressing force in real time by adjusting the change of the oil pressure in the hydraulic cylinder, the smooth forming of the tailor-welded blank is ensured, after the forming, the upper die and the blank pressing mechanism move upwards and move downwards to, the mechanical structure has high integration level, is suitable for the block and edge pressing experiment of the tailor-welded blank, and is beneficial to the forming of the tailor-welded blank.
Description
Technical Field
The invention belongs to the field of experimental devices, and particularly relates to a hydraulic blocking and edge pressing forming device and a hydraulic blocking and edge pressing forming method for a tailor-welded blank.
Background
In the modern automobile industry, tailor welded blanks have many advantages in terms of weight reduction of automobiles, reduction of the types and number of molds, and the like. Therefore, with the attention of more and more widespread attention, a large number of tailor-welded blanks are used in automobile production by many automobile manufacturers, and the latest research results show that: in the latest steel car body structure, more than 50% is manufactured by adopting tailor welded blanks.
However, although the tailor welded blank has many advantages, many difficulties which are difficult to solve technically appear, and the study on the tailor welded blank still cannot meet the requirements of people on the forming process of the tailor welded blank. In the tailor-welded blank forming process, the blank holder force is an important factor influencing the tailor-welded blank forming, the reasonable blank holder force can effectively inhibit wrinkling and cracking of parts, and the blocking blank holder is more and more emphasized by people as a means for effectively solving the problem in the tailor-welded blank forming process, but no experimental device suitable for researching the tailor-welded blank forming exists at present, so that the research on the blocking blank holder forming process of the tailor-welded blank is greatly limited.
Disclosure of Invention
The hydraulic blocking and blank pressing forming device and the hydraulic blocking and blank pressing forming method for the tailor-welded blank are designed by utilizing hydraulic pressure to provide power and adopting a blocking and blank pressing method. Specifically, the hydraulic blocking and blank-pressing forming device for the tailor-welded blank divides the blank holder into four blocks along the axial direction, and realizes independent and real-time online control on each blocking and blank holder, thereby solving the problem of better realizing effective blank-pressing control on the whole deformation area when the thickness of the plate material in the deformation area is not uniformly distributed along the circumferential direction.
The hydraulic blocking and edge pressing forming device comprises an upper die holder, a male die, an upright post, an edge pressing mechanism, a hydraulic cylinder cavity and a lower die holder, wherein the male die is fixed on the upper die holder, and the hydraulic cylinder cavity is fixedly arranged on the lower die holder;
two upright posts are arranged between the upper die holder and the hydraulic cylinder cavity, the first end of each upright post is fixedly connected in the upper die holder, and the second end of each upright post can extend into the hydraulic cylinder cavity in a sliding manner;
the blank pressing mechanism comprises an upper blank pressing ring, an upper blank pressing ring fixing column and four groups of blank pressing assemblies with the same structure, each group of blank pressing assemblies comprises a blocking blank pressing ring, a guide pillar and a piston, the upper blank pressing ring fixing column is used for fixedly connecting the upper blank pressing ring, the upper end of the upper blank pressing ring fixing column is fixed on the upper blank pressing ring, and the bottom end of the upper blank pressing ring fixing column is fixed in a groove in the top of the hydraulic cylinder cavity; the four blocking blank holders are spliced end to end along the circumferential direction to form a circular ring with a through hole in the middle, the first end of each guide pillar is fixedly arranged on one blocking blank holder, the second end of each guide pillar is fixedly connected with a piston, each piston is arranged in a hydraulic cavity of a hydraulic cylinder cavity, and each blank holder assembly can independently move up and down under the action of a hydraulic control system;
the hydraulic cylinder cavity comprises a body and bosses arranged on two sides of the body, the bosses are provided with guide holes for the stand columns to slide in, the body is evenly provided with four hydraulic cavities along the circumferential direction, the four hydraulic cavities can be controlled by a hydraulic control system to output pressure respectively in real time, and different blank pressing forces are provided for the tailor-welded blank.
Preferably, four hydraulic chambers of the hydraulic cylinder chamber are respectively a first hydraulic chamber, a second hydraulic chamber, a third hydraulic chamber and a fourth hydraulic chamber, each hydraulic chamber comprises a rod chamber and a rodless chamber, and the hydraulic control system comprises an oil tank, a filter, a hydraulic pump, a first hydraulic unit, a second hydraulic unit, a third hydraulic unit and a fourth hydraulic unit;
the first hydraulic unit comprises a first electromagnetic overflow valve and a first electromagnetic directional valve; the second hydraulic unit comprises a second electromagnetic overflow valve and a second electromagnetic directional valve; the third hydraulic unit comprises a third electromagnetic overflow valve and a third electromagnetic directional valve; the fourth hydraulic unit comprises a fourth electromagnetic overflow valve and a fourth electromagnetic directional valve; the hydraulic pump is arranged in the oil tank, the filter is arranged at an oil inlet of the hydraulic pump, the first hydraulic unit, the second hydraulic unit, the third hydraulic unit and the fourth hydraulic unit are arranged in parallel, oil inlets of the four hydraulic units are respectively communicated with oil outlets of the hydraulic pump, and oil return ports of the four hydraulic units are respectively communicated with the oil tank;
the first electromagnetic overflow valve is connected with the first electromagnetic directional valve, an oil outlet A1 of the first electromagnetic directional valve is connected with a rodless cavity of a first hydraulic cavity in the hydraulic cylinder cavity, and an oil outlet B1 of the first electromagnetic directional valve is connected with a rod cavity of the first hydraulic cavity in the hydraulic cylinder cavity; the second electromagnetic overflow valve is connected with the second electromagnetic directional valve, the oil outlet A2 of the second electromagnetic directional valve is connected with a rodless cavity of a second hydraulic cavity in the hydraulic cylinder cavity, and the oil outlet B2 of the second electromagnetic directional valve is connected with a rod cavity of the second hydraulic cavity in the hydraulic cylinder cavity; the third electromagnetic overflow valve is connected with a third electromagnetic directional valve, an oil outlet A3 of the third electromagnetic directional valve is connected with a rodless cavity of a third hydraulic cavity in the hydraulic cylinder cavity, and an oil outlet B3 of the third electromagnetic directional valve is connected with a rod cavity of the third hydraulic cavity in the hydraulic cylinder cavity; the fourth electromagnetic overflow valve is connected with the fourth electromagnetic directional valve, the oil outlet A4 of the fourth electromagnetic directional valve is connected with a rodless cavity of a fourth hydraulic cavity in the hydraulic cylinder cavity, and the oil outlet B4 of the fourth electromagnetic directional valve is connected with a rod cavity of the fourth hydraulic cavity in the hydraulic cylinder cavity.
Preferably, the blocking blank holders are arranged in a quarter-ring shape, and each blocking blank holder is provided with a blind hole for the guide pillar to penetrate through.
Preferably, the male die has an initial position and a preset position.
Preferably, one ends of the upper parts of the two stand columns are symmetrically welded to the upper die base near the outer edge.
Preferably, the invention also provides a hydraulic blocking and blank pressing forming method for the tailor-welded blank, which comprises the following steps: s1, preparing for forming the tailor-welded blank: after hydraulic oil enters a hydraulic cylinder cavity, adjusting the heights of the four blocking blank holders to enable the upper surfaces of the four same blocking blank holders to be in a parallel and level state, placing a tailor-welded blank on the upper surfaces of the four parallel and level blocking blank holders, enabling the hydraulic oil to enter a rodless cavity below a piston in a hydraulic cavity through four lower oil inlet holes of the hydraulic cylinder cavity, pushing the piston, a guide pillar and the blocking blank holders to move upwards, enabling the tailor-welded blank to be clamped between the upper blank holders and the blocking blank holders, and completing preparation work for forming the tailor-welded blank;
s2, the upright post fixed on the upper die holder and the male die move downwards together through the downward movement of the upper die holder, and when the male die is contacted with the tailor-welded blank, the tailor-welded blank starts a forming process;
s3, adjusting the edge pressing force of the blocking edge pressing ring, enabling the upper die holder and the male die to move downwards, and completing the forming process of the tailor-welded blank when the male die reaches a certain preset position;
and S4, moving the upper die base and the male die upwards, moving the piston, the guide post and the blocking blank holder downwards, returning to the initial position, and waiting for the next operation.
Preferably, in step S3, the hydraulic control system controls the blank holder force in real time by adjusting the change of the oil pressure of the hydraulic chamber, so as to ensure the formation of tailor-welded blanks with different thicknesses.
Compared with the prior art, the invention has the following beneficial effects:
1. the hydraulic cylinder is compact in structure, four hydraulic cavities can be combined and designed in one hydraulic cylinder cavity, and manufacturing cost is reduced.
2. The device realizes blocking and edge pressing, and the edge pressing force is adjustable.
3. The invention has simple and convenient integral processing, simple part structure and convenient processing, and does not have parts with complex structures and difficult processing. The manufacturing period is shortened, and the manufacturing cost is reduced.
Drawings
FIG. 1 is a schematic view of the overall structure of a hydraulic blocking and edge pressing forming device for a tailor-welded blank according to the present invention;
FIG. 2 is a schematic diagram of a right-view structure of the overall structure of the hydraulic blocking and edge-pressing forming device for tailor-welded blanks according to the present invention;
FIG. 3 is a schematic sectional view A-A of FIG. 2;
FIG. 4 is a schematic diagram of a hydraulic control system;
FIG. 5 is a schematic perspective view of the present invention;
FIG. 6 is a schematic structural view of an upper die base and its components according to the present invention;
FIG. 7 is a schematic structural view of an upper binder ring of the present invention;
FIG. 8 is a schematic view of the construction of the blank holder assembly and the hydraulic cylinder chamber of the present invention;
FIG. 9 is a schematic structural view of a male mold of the present invention;
FIG. 10 is a schematic structural view of a blocked blank holder of the present invention;
FIG. 11 is a schematic structural view of a hydraulic cylinder chamber according to the present invention;
FIG. 12 is a schematic sectional view of the structure of FIG. 1B-B.
Detailed Description
The invention is described in further detail below with reference to the figures and example operations. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
The invention provides a hydraulic blocking and edge pressing forming device for a tailor-welded blank, which comprises an upper die holder 1, an inner hexagon bolt 2, an upright post 3, a male die 4, an edge pressing mechanism 100, a hydraulic cylinder cavity 10 and a lower die holder 11, as shown in figures 1 to 6. A hydraulic cylinder cavity 10 is fixedly arranged on the lower die base 11, a blank pressing mechanism 100 is arranged on the hydraulic cylinder cavity 10, and the male die 4 is arranged on the upper die base 1. The tailor welded blank 122 provided in the edge pressing mechanism 100 is drawn and formed as the upper die holder 1 moves up and down.
The tailor welded blank 122 of the present invention can be two sheets of different thickness t1 and t2, or a plurality of tailor welded blanks of different thickness and material properties. For the tailor welded blank 122 of such non-axisymmetric part, the blank pressing effect is not good when the conventional blank pressing device is used for deep drawing. The invention provides a hydraulic blocking and edge pressing forming device with a novel structure for tailor-welded blanks. The device divides the blank holder into four blocks along the axial direction, and realizes independent and real-time online control on each block blank holder, thereby solving the problem of implementing effective blank holder control on the whole deformation area when the thickness of the plate material in the deformation area is not uniformly distributed along the circumferential direction.
Specifically, the punch 4 is fixed to the upper die holder 1 by a bolt structure, and in the present embodiment, the punch 4 is fixed to the upper die holder 1 by two hexagon socket head bolts 2. When the upper die holder 1 moves up and down, the male die 4 can move up and down along with the upper die holder 1, the male die 4 is provided with an upper initial position and a lower tailor-welded blank forming preset position, and when the male die 4 moves to the lower tailor-welded blank 122 forming preset position, the tailor-welded blank forming process is completed.
Two upright posts 3 with the same structure are respectively arranged between the upper die base 1 and the hydraulic cylinder cavity 10, the first ends of the two upright posts 3 positioned at the upper part are fixed on the upper die base 1, and the second ends of the two upright posts 3 positioned at the bottom part slide into the guide holes 104 of the hydraulic cylinder cavity 10 and can move up and down in the guide holes 104. The two upright posts 3 are symmetrically arranged at the through holes of the upper die holder 1 relative to the longitudinal central line of the upper die holder 1.
As shown in fig. 8, four sets of the blocking and blank holder 7, the guide post 8, and the piston 9 are provided for blocking and blank-holding the tailor welded blank 122, respectively. Each blocking blank holder 7, each guide post 8 and each piston 9 form a group of blank holding assemblies, and the four blocking blank holders 7, the guide posts 8 and the pistons 9 form four groups of blank holding assemblies which are uniformly distributed along the circumferential direction. Each guide post 8 and each piston 9 can be moved up and down independently under the control of the hydraulic control system.
The first end of each guide post 8 is fixedly arranged on one blocking blank holder 7, and the second end of each guide post 8 is fixedly connected to one piston 9. The four identical pistons 9 are arranged in four hydraulic cavities 103 of the hydraulic cylinder cavity 10, and the hydraulic cylinder cavity 10 is welded on the lower die base 11.
As shown in fig. 9, the punch 4 includes a circular base 41 and a cylindrical body 42, two threaded holes 43 are provided on the circular base 41, and the punch 4 is fixed on the upper die holder 1 by means of the threaded holes 43 and the hexagon socket head cap screw 2.
As shown in fig. 10, the blocking blank holders 7 are arranged in a quarter-circle shape, and each blocking blank holder 7 is provided with a blind hole 71 for the guide post 8 to penetrate. The four blocking blank holders 7 with the same structure can be spliced end to form a circular ring with a through hole 81 in the middle.
As shown in fig. 11 and 12, the cylinder chamber 10 includes a main body 101 having a cylindrical structure and bosses 102 provided on both sides of the main body 101, the main body 101 is provided with a hydraulic chamber 103 into which the guide post 8 moves up and down, and the bosses 102 are provided with guide holes 104 into which the column 3 slides. As shown in fig. 3, in a preferred embodiment, the body 101 is uniformly provided with four hydraulic chambers 103 along the circumferential direction, and the four pistons 9 are respectively disposed in the four hydraulic chambers 103. The bottom of each hydraulic chamber 103 is provided with an oil inlet hole 105. The four hydraulic chambers 103 can be independently controlled by the control system to perform hydraulic pressure control so as to provide different edge pressing forces to the tailor welded blank 122 as required.
In the present invention, the hydraulic device for controlling the hydraulic chamber 103 is constructed and operated as follows:
the four hydraulic chambers 103 of the hydraulic cylinder chamber 10 are respectively a first hydraulic chamber, a second hydraulic chamber, a third hydraulic chamber and a fourth hydraulic chamber, each hydraulic chamber is provided with a rod chamber 110 and a rodless chamber 111, and the rod chamber 110 and the rodless chamber 111 of the two hydraulic chambers are shown in fig. 3. As shown in fig. 4, the hydraulic control system includes an oil tank 12, a filter 13, a hydraulic pump 14, a first hydraulic unit, a second hydraulic unit, a third hydraulic unit, and a fourth hydraulic unit.
The first hydraulic unit includes a first electromagnetic spill valve 15 and a first electromagnetic directional valve 19; the second hydraulic unit includes a second electromagnetic spill valve 16 and a second electromagnetic directional valve 20; the third hydraulic unit comprises a third electromagnetic overflow valve 17 and a third electromagnetic directional valve 21; the fourth hydraulic unit includes a fourth electromagnetic spill valve 18 and a fourth electromagnetic directional valve 22; the hydraulic pump 14 is installed in the oil tank 12, the filter 13 is arranged at an oil inlet of the hydraulic pump 14, the first hydraulic unit, the second hydraulic unit, the third hydraulic unit and the fourth hydraulic unit are arranged in parallel, oil inlets of the four hydraulic units are communicated with an oil outlet of the hydraulic pump 14 respectively, and oil return ports of the four hydraulic units are communicated with the oil tank 12 respectively.
The first electromagnetic overflow valve 15 is connected with the first electromagnetic directional valve 19, an oil outlet A1 of the first electromagnetic directional valve 19 is connected with a rodless cavity 111 of a first hydraulic cavity in the hydraulic cylinder cavity 10, and an oil outlet B1 of the first electromagnetic directional valve 19 is connected with a rod cavity 110 of the first hydraulic cavity in the hydraulic cylinder cavity 10; the second electromagnetic overflow valve 16 is connected with the second electromagnetic directional valve 20, an oil outlet A2 of the second electromagnetic directional valve 20 is connected with a rodless cavity 111 of a second hydraulic cavity in the hydraulic cylinder cavity 10, and an oil outlet B2 of the second electromagnetic directional valve 20 is connected with a rod cavity 110 of the second hydraulic cavity in the hydraulic cylinder cavity 10; the third electromagnetic overflow valve 17 is connected with the third electromagnetic directional valve 21, an oil outlet A3 of the third electromagnetic directional valve 21 is connected with a rodless cavity 111 of a third hydraulic cavity in the hydraulic cylinder cavity 10, and an oil outlet B3 of the third electromagnetic directional valve 21 is connected with a rod cavity 110 of the third hydraulic cavity in the hydraulic cylinder cavity 10; the fourth electromagnetic overflow valve 18 is connected with the fourth electromagnetic directional valve 22, an oil outlet a4 of the fourth electromagnetic directional valve 22 is connected with a rodless cavity 111 of a fourth hydraulic cavity in the hydraulic cylinder cavity 10, and an oil outlet B4 of the fourth electromagnetic directional valve 22 is connected with a rod cavity 110 of the fourth hydraulic cavity in the hydraulic cylinder cavity 10.
The hydraulic pump 14 is started for supplying oil to the hydraulic control system, and the hydraulic control system controls the oil pressure values of oil outlets of the four electromagnetic overflow valves, so that the four hydraulic cavities 103 of the hydraulic cylinder cavity 10 obtain required pressure values, and further the blocking blank holders 7 obtain respective required real-time blank holding forces. The real-time edge pressing force obtained by the blocking blank holder 7 is used for matching with an external press to drive the upper die holder 1 and the male die 4 thereon to carry out the deep drawing process of the tailor-welded blank 122. The four electromagnetic directional valves are used for controlling the pistons 9 of the four hydraulic cavities 103 of the hydraulic cylinder cavity to be in an extending or contracting state, when the valve cores of the four electromagnetic directional valves are arranged at a left position, the valve cores are attracted to the left end under the action of magnetic force, hydraulic oil enters the rodless cavities 111 of the four hydraulic cavities 103 through hydraulic pipelines, and the guide post 8 is ejected out. When the valve cores of the four electromagnetic directional valves are arranged at the right position, hydraulic oil enters the rod cavities 110 of the four hydraulic cavities through the hydraulic pipelines, so that the guide pillars 8 are retracted; when the valve cores of the four electromagnetic directional valves are arranged in the middle position, the four hydraulic cavities 103 are locked, and the action of the blank pressing assembly is controlled through the states of the four valve cores.
In another aspect of the present invention, a hydraulic blocking and blank-pressing method for tailor-welded blanks is further provided, which includes the following steps:
s1, preparing for forming the tailor-welded blank: after hydraulic oil gets into the pneumatic cylinder cavity, adjust the height of four piecemeal blank holders, make the upper surface of four the same piecemeal blank holders be in the parallel and level state, place the piecemeal blank holder upper surface at four parallel and level, hydraulic oil passes through four inlet port down of pneumatic cylinder cavity, enters into in the middle of four hydraulic pressure chambeies of the inside piston below of pneumatic cylinder cavity, promote the piston, guide pillar and piecemeal blank holder and shift up, make the piece clamp of piecemeal blank holder hold between last blank holder and piecemeal blank holder, accomplish the preparation work that the piece formed.
And S2, moving the upright post fixed on the upper die holder and the male die downwards through the downward movement of the upper die holder, and starting the forming process of the tailor-welded blank when the male die is contacted with the tailor-welded blank.
And S3, fixing the upper blank holder, moving the upper die holder and the male die downwards, and controlling the blank holder force in real time by the blank holder mechanism by means of the change of the oil pressure of the hydraulic cylinder cavity to provide the blank holder force required by the forming of the tailor-welded blank.
And S4, finishing the forming process of the tailor-welded blank when the male die reaches a certain preset position.
And S5, moving the upper die holder and the male die fixed on the upper die holder upwards, moving the piston, the guide pillar and the blocking blank holder downwards to return to the initial position, and waiting for the next operation.
In step S3, the hydraulic control system controls the blank holder force in real time by adjusting the change of the oil pressure of the hydraulic cylinder cavity 10, so as to ensure the formation of tailor-welded blanks of different thicknesses.
The invention is further explained below with reference to specific examples:
and in the drawing preparation stage, firstly, the hydraulic pump 14 is started, the operation is not required to be carried out in the next operation, the four electromagnetic overflow valves are opened, the valve cores of the four electromagnetic directional valves are arranged at the left position, the blank holder assemblies of the four hydraulic cavities are extended, when the four block blank holders 7 are at the same height, the valve cores of the four electromagnetic directional valves are arranged at the middle position to lock the blank holder assemblies, the tailor-welded blank 122 is arranged on the upper surfaces of the four block blank holders 7, the valve cores of the four electromagnetic directional valves are opened again and arranged at the left position, the piston of the hydraulic cylinder cavity 10 is extended to enable the tailor-welded blank 122 to be clamped between the block blank holders 7 and the upper blank holder 5, at the moment, the valve cores of the four electromagnetic directional valves are arranged at the middle position to lock the blank holder.
In the deep drawing forming stage, an external press drives the upper die holder 1 and the male die 4 thereon to press downwards at a constant speed, and when the male die 4 contacts the tailor-welded blank 122, the tailor-welded blank 122 starts the forming process. At the moment, the valve cores of the four electromagnetic directional valves are placed in the left blank pressing assembly again to extend out, and the hydraulic control system controls the oil pressure values of the oil outlets of the four electromagnetic overflow valves so that the blank pressing assembly obtains the required pressure value and the blocking blank pressing rings 7 apply respective real-time blank pressing force. And when the male die 4 reaches a preset process position, the drawing process is completed, and the valve cores of the four electromagnetic directional valves are placed in the middle position locking and edge pressing assembly.
After the forming process is finished, the upper die base 1 and the male die 4 fixed on the upper die base move upwards and return to the initial position, the valve cores of the four electromagnetic directional valves are placed in the right position side pressing assembly to retract, the side pressing assembly returns to the initial position, the valve cores of the four electromagnetic directional valves are placed in the middle position to lock the side pressing assembly, and the next operation is waited.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solution of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (4)
1. The utility model provides a tailor-welded blank hydraulic pressure blocking blank pressing forming device which characterized in that: the stamping die comprises an upper die base, an upright post, a male die, a blank pressing mechanism, a hydraulic cylinder cavity and a lower die base, wherein the male die is fixed on the upper die base, and the hydraulic cylinder cavity is fixedly arranged on the lower die base;
two upright posts are arranged between the upper die holder and the hydraulic cylinder cavity, a first end of each upright post is fixedly connected in the upper die holder, and a second end of each upright post can extend into a guide hole of the hydraulic cylinder cavity in a sliding manner;
the edge pressing mechanism comprises an upper edge pressing ring, an upper edge pressing ring fixing column and four groups of edge pressing assemblies with the same structure, and each group of edge pressing assemblies comprises a blocking edge pressing ring, a guide pillar and a piston; the upper blank holder fixing column is used for fixedly connecting the upper blank holder, the upper end of the upper blank holder fixing column is fixed on the upper blank holder, and the bottom end of the upper blank holder fixing column is fixed in a groove in the top of the hydraulic cylinder cavity; the four blocking blank holders are spliced end to end along the circumferential direction to form a circular ring with a through hole in the middle, the first end of each guide pillar is fixedly arranged on one blocking blank holder, the second end of each guide pillar is fixedly connected with one piston, each piston is arranged in one hydraulic cavity of the hydraulic cylinder cavity, and each blank holder assembly can independently move up and down under the action of the hydraulic cylinder cavity;
the hydraulic cylinder cavity comprises a body and bosses arranged on two sides of the body, the bosses are provided with guide holes for the stand columns to stretch into, the body is evenly provided with four hydraulic cavities along the circumferential direction, the four hydraulic cavities can be controlled by a hydraulic control system to output pressure in real time respectively, and different blank pressing forces are provided for respective tailor-welded blanks.
2. The tailor welded blank hydraulic blocking blank holder forming device according to claim 1, wherein: the blocking blank holder is in a quarter-ring shape, and each blocking blank holder is provided with a blind hole for the guide pillar to penetrate into.
3. The tailor welded blank hydraulic blocking blank holder forming device according to claim 1, wherein: the male die has an initial position and a preset position.
4. The tailor welded blank hydraulic blocking blank holder forming device according to claim 1, wherein: and one ends of the upper parts of the two stand columns are symmetrically welded at the through hole of the upper die base.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910400946.XA CN110227750B (en) | 2019-05-15 | 2019-05-15 | Hydraulic blocking and blank pressing forming device and forming method for tailor-welded blank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910400946.XA CN110227750B (en) | 2019-05-15 | 2019-05-15 | Hydraulic blocking and blank pressing forming device and forming method for tailor-welded blank |
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| CN110227750A CN110227750A (en) | 2019-09-13 |
| CN110227750B true CN110227750B (en) | 2020-08-11 |
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| CN115634993B (en) * | 2022-12-23 | 2023-03-10 | 吉林大学 | Floating type blank pressing hydraulic bidirectional single-mode deep drawing forming device and forming method |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5372027A (en) * | 1989-11-29 | 1994-12-13 | Armco Steel Company, L.P. | Controlled material flow hydroforming |
| CN102029325B (en) * | 2010-11-18 | 2013-01-23 | 江苏大学 | Drawing mold with variable blank holder force with hydraulic linkage control of machine |
| CN102303063A (en) * | 2011-06-28 | 2012-01-04 | 哈尔滨工业大学 | Weld-line movement-controlled tailor-welded blank stamp-forming device |
| CN102527806A (en) * | 2012-01-17 | 2012-07-04 | 燕山大学 | Multi-blank-holder radial blocking-blank pressing method applied to nonaxisymmetrical piece |
| CN204308008U (en) * | 2014-04-29 | 2015-05-06 | 燕山大学 | A kind of radial blocking flange fixing installation of combination of rigidity and flexibility |
| CN204247793U (en) * | 2014-11-05 | 2015-04-08 | 湖南农业大学 | A kind of drawing die with variable blank holding pressure tool with automatic control function |
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