Gap-adjustable hot forming flat plate mold

Abstract

The utility model discloses a thermoforming flat plate die capable of adjusting a gap, which comprises an upper die and a lower die, the upper die is provided with an upper die holder and an upper insert, the lower die is provided with a lower die holder and a lower insert, the upper insert and the lower insert are respectively connected with the upper die holder and the lower die holder through bolts, and the lower die is further provided with a lower movable block and an adjusting gasket. The lower insert is divided into a high side part and a low side part, the high side part is higher than the low side part, and the lower movable block and the adjusting gasket are detachably and sequentially installed on the upper portion of the low side part from top to bottom. According to the gap-adjustable hot forming flat plate die, flat plate hot forming of equal-thickness high-strength steel plates can be achieved, flat plate hot forming of different-thickness laser tailor-welded blanks with different thickness differences can also be achieved, the die is used for earlier-stage process exploration, corresponding dies do not need to be manufactured independently, and the dies do not need to be replaced frequently; the hot forming can be realized on the same set of die, the application range is wide, the production cost and the die changing frequency are reduced, and the production efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of hot forming technology for high-strength steel flat plates used in the early stages of process exploration, and specifically to a hot forming flat plate mold with adjustable gap for laser-welded high-strength steel plates of unequal thickness. Background Technology

[0002] Thermoforming technology has a wide range of applications. In the process of exploring thermoforming process parameters, flat plate thermoforming tests play a very important role. Among them, thermoforming flat plate molds are key equipment to ensure the quality of the tests.

[0003] Currently, in traditional hot forming flat plate mold technology, the mold surfaces are all planar, which can only achieve flat hot forming of high-strength steel plates of uniform thickness for early process exploration. However, with the development of hot forming technology, the application of unequal thickness laser-welded plates is becoming increasingly widespread. Unequal thickness laser-welded plates are made by joining two or more high-strength steel plates of different thicknesses together through laser welding. Traditional hot forming flat plate molds, due to their planar surface characteristics, cannot meet the process exploration requirements for unequal thickness laser-welded plates (in addition to process exploration of the plates themselves, process exploration of the laser weld seam is also required). At the same time, because high-strength steel plates of different thicknesses are welded together, the thickness difference between different unequal thickness laser-welded plates is different. If a corresponding hot forming flat plate mold is manufactured for each type of unequal thickness laser-welded plate, it will increase production costs, and frequent mold changes will lead to a decrease in production efficiency. Therefore, how to achieve flat plate thermoforming of laser-welded plates with different thicknesses for preliminary process exploration, in order to overcome the limitations of traditional thermoforming flat plate molds, is an urgent problem to be solved in this field.

[0004] In summary, in view of the problems existing in the prior art, there is an urgent need in the field for a thermoforming plate mold that can realize the thermoforming of laser-welded plates with different thicknesses for the early process exploration, so as to reduce production costs and improve production efficiency. Utility Model Content

[0005] In view of this, the purpose of this utility model embodiment is to propose an adjustable gap thermoforming plate mold, which can solve the problem of limited application of existing thermoforming plate molds, realize the thermoforming of laser-welded plates with different thicknesses for early process exploration, thereby reducing production costs and improving production efficiency.

[0006] To achieve the above objectives, one aspect of this utility model provides an adjustable-gap thermoforming flat plate mold, including an upper mold and a lower mold. The upper mold is provided with an upper mold base and an upper insert, and the lower mold is provided with a lower mold base and a lower insert. The upper insert and the lower insert are respectively connected to the upper mold base and the lower mold base by first bolts.

[0007] The lower mold is also provided with a lower movable block and an adjusting shim. The lower insert is divided into a high side and a low side, with the high side being higher than the low side. The lower movable block and the adjusting shim are detachably installed from top to bottom on the upper part of the low side.

[0008] Preferably, the adjustable gap thermoforming flat mold described above has a groove provided on the upper surface at the junction of the high side and the low side.

[0009] Preferably, in the adjustable gap thermoforming flat plate mold described above, the lower movable block and the adjusting shim are mounted on the upper part of the lower side by a second bolt.

[0010] Preferably, in the adjustable gap thermoforming flat plate mold described above, straight holes are respectively machined at the four corners of the lower part of the upper insert and the four corners of the upper part of the lower insert, and two straight holes with the same diameter as the lower movable block and the adjusting shim are respectively machined on the lower movable block and the adjusting shim, and positioning pins are respectively inserted into the corresponding straight holes and the through holes at each corner.

[0011] Preferably, in the adjustable gap thermoforming flat plate mold described above, vertical plunger holes are machined on the upper part of the high side of the lower insert and the lower movable block, and a plunger is inserted into each plunger hole.

[0012] Preferably, in the adjustable gap thermoforming flat mold described above, the upper mold base and the lower mold base are respectively provided with side threaded holes, and a third bolt is installed in the side threaded holes.

[0013] Beneficial effects

[0014] The adjustable gap thermoforming plate mold provided by this utility model can not only realize the thermoforming of high-strength steel plates of equal thickness, but also realize the thermoforming of laser-welded plates of unequal thickness for early process exploration by adjusting the height of the lower movable block. Furthermore, for laser-welded plates of unequal thickness with different thickness differences, it is not necessary to manufacture corresponding molds separately or frequently change molds. The thermoforming can be realized on the same set of molds, which makes the application range of thermoforming plate molds wider, reduces production costs and the frequency of mold changes, and improves production efficiency. Attached Figure Description

[0015] Figure 1 This is a schematic cross-sectional view of an adjustable-gap thermoforming flat plate mold according to an embodiment of the present invention;

[0016] Figure 2 for Figure 1 A schematic perspective view of a thermoforming flat plate mold with adjustable gap;

[0017] Figure 3 for Figure 1 Top view of the lower die of a thermoforming flat plate mold with adjustable clearance;

[0018] Figure 4 for Figure 1 A partially exploded view of the lower die of a thermoforming flat plate mold with adjustable clearance; and

[0019] Figure 5 This is a side view of the lower die of an adjustable-gap thermoforming flat plate mold according to another embodiment of the present invention. Detailed Implementation

[0020] The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention. Unless otherwise specified, the technical means used in the embodiments are conventional means well known to those skilled in the art.

[0021] It should be noted that all expressions such as "first" and "second" used in the embodiments of this utility model are for the purpose of distinguishing multiple entities or parameters with the same name but different names. It can be seen that "first" and "second" are only for the convenience of expression and should not be construed as limiting the embodiments of this utility model. Subsequent embodiments will not explain this in detail.

[0022] Based on the above objectives, this utility model provides an embodiment of an adjustable gap thermoforming flat plate mold. Figure 1 This is a schematic cross-sectional view of the adjustable-gap thermoforming flat plate mold of this embodiment; Figure 2 This is a schematic perspective view of the adjustable gap thermoforming flat plate mold of this embodiment;

[0023] Figure 3 This is a top view of the lower die of the adjustable-gap thermoforming flat plate mold in this embodiment; Figure 4 This is a partially exploded view of the lower die of the adjustable-gap thermoforming flat plate mold in this embodiment, wherein... Figure 1 and Figure 2 The mold shown is in an open state. Figures 1 to 4As shown, the adjustable-gap thermoforming flat plate mold includes an upper mold and a lower mold. The upper and lower molds can be connected to a pressure device, which is used to drive the upper mold and / or the lower mold to move, thereby achieving the separation or closing of the upper and lower molds. The upper mold is provided with an upper mold base 1 and an upper insert 2, and the lower mold is provided with a lower mold base 8 and a lower insert 6. The upper insert 2 and the lower insert 6 are respectively connected to the upper mold base 1 and the lower mold base 8 by a first bolt 9. The lower mold is also provided with a lower movable block 4 and an adjusting shim 7. The lower insert 6 is divided into a high side and a low side, with the high side being higher than the low side. The lower movable block 4 and the adjusting shim 7 are detachably installed sequentially from top to bottom on the upper part of the low side. Figure 1 As shown, the high side and low side of the lower insert 6 are centered on a plane perpendicular to its shape. However, this centered division may not be used depending on the actual situation. It should be noted that the high side and low side are defined here for ease of distinction, but in reality, they are not independent parts. In other words, the lower insert 6 is a whole.

[0024] The lower movable block 4 and the adjusting shim 7 are mounted on the upper part of the lower side by a second bolt 11, such that the adjusting shim 7 is positioned between the lower insert 6 and the lower movable block 4. Specifically, four longitudinal threaded holes are formed on the upper part of the lower side of the lower insert 6; simultaneously, corresponding to the positions of the four threaded holes on the lower side of the lower insert 6, countersunk holes are formed in the lower movable block 4, and through holes are formed in the adjusting shim 7. The lower movable block 4, the adjusting shim 7, and the lower insert 6 are connected and fixed by the second bolt 11 installed into the aforementioned threaded holes, countersunk holes, and through holes, preventing loosening during the thermoforming process.

[0025] Straight holes are machined at the four corners of the lower part of the upper insert 2 and the four corners of the upper part of the lower insert 6, respectively. Two through holes of the same diameter, corresponding to the lower side of the lower insert 6, are machined on the lower movable block 4 and the adjusting shim 7. Positioning pins 3 are inserted into the corresponding straight holes and through holes at each corner. The relative positions of the upper and lower molds are determined by the four positioning pins 3.

[0026] Vertical plunger holes (threaded holes) are machined on the upper left sides of the high side of the lower insert 6 and on the right sides of the lower movable block 4. Each plunger hole is fitted with a plunger 5 for supporting the sheet material. The plunger 5 can prevent the austenitized sheet material from contacting the lower mold too early before the mold is closed, thus avoiding heat loss and more closely resembling the actual production process.

[0027] In the above embodiment, the lower insert 6 is divided into high and low sides, with the lower side being height-adjustable in conjunction with the lower movable block 4 and the adjusting shim 7. When the adjusting shim 7 is not inserted, the lower movable block 4 can also be connected and fixed to the lower insert 6 by bolts. In this case, the upper surface of the lower movable block 4 is flush with the high side of the lower insert 6, enabling experimental exploration of the hot forming process for flat sheet high-strength steel of equal thickness. When the test object is a laser-welded plate of unequal thickness, based on the height difference between the two sides of the plate, an adjusting shim 7 of the same thickness as the height difference is placed between the lower movable block 4 and the lower insert 6 on the lower side. The lower movable block 4, the adjusting shim 7, and the lower insert 6 are then connected and fixed by bolts, enabling experimental exploration of the hot forming process for flat sheet laser-welded plates of unequal thickness.

[0028] Based on the above embodiments, the upper mold base 1 and the lower mold base 8 are respectively provided with side threaded holes, and a third bolt 12 is installed in the side threaded holes. The overall transportation of the mold and the opening and closing of the upper and lower molds are realized by the third bolt 12. For example, symmetrical side threaded holes are provided on two opposite sides of the upper mold base 1 and the lower mold base 8, with two side threaded holes on each side.

[0029] Based on the above embodiments, to achieve interference-free engagement between the lower movable block 4 and the lower insert 6, a groove 10 is provided on the upper surface at the junction of the high and low sides of the lower insert 6. In another embodiment, the groove 10 can be replaced with other forms, such as... Figure 5 As shown, there is no groove on the upper surface at the junction of the high side and the low side of the lower insert 6. Instead, the lower edge of the lower movable block 4 near the high side of the lower insert 6 is chamfered, so that a gap 13 is formed between the lower movable block 4 and the lower insert 6.

[0030] The assembly and operation process of the adjustable-gap thermoforming flat plate mold of this utility model are as follows:

[0031] 1) Select a press of appropriate specifications according to the size of the adjustable gap thermoforming flat mold for mold installation. The mold and the press table are connected and fixed by a pressure plate.

[0032] 2) Raise the upper mold, remove the positioning pins 3 at the four corners, and select the adjustment shims 7 with the same thickness value according to the height difference of the laser-welded plates with different thicknesses. Place them between the lower movable block 4 and the lower insert 6 and fix them with bolts to avoid loosening during the test.

[0033] 3) The installed adjustable gap thermoforming flat mold can then be used for thermoforming process exploration and testing;

[0034] 4) During the test, first place the austenitized high-temperature unequal thickness laser-welded sheet on the lower die, with the side with the height difference of the sheet facing down and the thinner side corresponding to one side of the lower movable block 4. Ensure that the weld is placed on the higher side of the lower insert 6. At the same time, try to ensure that the sheet is in contact with the plungers 5 in all four places. The plungers 5 support the sheet to avoid premature heat loss due to contact with the lower die before stamping.

[0035] 5) After adjusting the position of the sheet, start the press to make the upper die descend. After the die is fully closed, hold the pressure for a period of time to ensure that the sheet material completes the transformation from austenite to martensite.

[0036] 6) After the pressure holding is completed, the upper die begins to move upward. When the upper die reaches the top dead center, use clamps or other tools to remove the sheet metal from the lower die.

[0037] At this point, the assembly of the adjustable gap thermoforming flat plate mold and a complete work cycle are completed. When testing laser-welded plates with other height differences and varying thicknesses, replace the adjusting shim 7 as described above, and then conduct process exploration tests according to steps 3), 4), 5), and 6).

[0038] In summary, the adjustable gap thermoforming plate mold provided by this utility model can not only achieve flat thermoforming of high-strength steel plates of uniform thickness by adjusting the height of the lower movable block, but also achieve flat thermoforming of laser-welded plates of unequal thickness for early process exploration. Furthermore, for laser-welded plates of unequal thickness with different thickness differences, it is not necessary to manufacture corresponding molds separately or frequently change molds. The thermoforming can be achieved on the same set of molds, making the application range of the thermoforming plate mold wider, reducing production costs and the frequency of mold changes, and improving production efficiency.

[0039] Although the present invention has been described in detail above with general description and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. An adjustable-gap thermoforming flat plate mold, comprising an upper mold and a lower mold, wherein the upper mold is provided with an upper mold base and an upper insert, and the lower mold is provided with a lower mold base and a lower insert, wherein the upper insert and the lower insert are respectively connected to the upper mold base and the lower mold base by a first bolt, characterized in that, The lower mold is also provided with a lower movable block and an adjusting shim. The lower insert is divided into a high side and a low side, with the high side being higher than the low side. The lower movable block and the adjusting shim are detachably installed from top to bottom on the upper part of the low side.

2. The adjustable gap thermoforming flat plate mold as described in claim 1, characterized in that, A groove is provided on the upper surface at the junction of the high side and the low side.

3. The adjustable gap thermoforming flat plate mold as described in claim 1, characterized in that, The lower movable block and the adjusting shim are mounted on the upper part of the lower side by a second bolt.

4. The adjustable gap thermoforming flat plate mold as described in claim 1, characterized in that, Straight holes are machined at the four corners of the lower part of the upper insert and the four corners of the upper part of the lower insert, respectively. Two straight holes with the same diameter as the lower movable block and the adjusting shim are machined on the lower movable block and the adjusting shim, respectively. A positioning pin is inserted into the corresponding straight hole and the through hole at each corner.

5. The adjustable gap thermoforming flat plate mold as described in claim 1, characterized in that, Vertical plunger holes are machined on the upper part of the high side of the lower insert and the lower movable block, and a plunger is inserted into each plunger hole.

6. The adjustable gap thermoforming flat plate mold as described in claim 1, characterized in that, The upper mold base and the lower mold base are respectively provided with side threaded holes, and a third bolt is installed in the side threaded holes.

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