CN109731995B - Experiment die and method for hot forming and hot trimming composite process - Google Patents
Experiment die and method for hot forming and hot trimming composite process Download PDFInfo
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- CN109731995B CN109731995B CN201910142570.7A CN201910142570A CN109731995B CN 109731995 B CN109731995 B CN 109731995B CN 201910142570 A CN201910142570 A CN 201910142570A CN 109731995 B CN109731995 B CN 109731995B
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Abstract
The invention provides a hot forming and hot trimming composite process experimental mould and a process method, wherein the hot forming and hot trimming composite process experimental mould comprises a lower template (1), a guide pillar (2), a buffer plate (3), a spring (4), a blank holder supporting plate (5), a male mould (6), a male mould cutter block (7), a blank holder block (8), a female mould cutter block (10), an upper template (11) and a female mould (12); the hot forming and hot trimming process method comprises a plate preparation step, a plate austenitizing step, a plate transferring step, a plate hot forming step, a plate hot trimming step and a pressure maintaining quenching step. The invention has simple and compact structure, integrates two procedures of hot forming and hot trimming, saves a large number of procedures of feeding, blanking and positioning, and improves the production efficiency; the invention can explore the influence of different process conditions on hot forming and hot trimming results.
Description
Technical Field
The invention relates to a hot forming and hot trimming composite process experimental die and a process method, in particular to a high-strength steel hot forming and hot trimming composite process experimental die and a process method.
Background
At present, the high-strength steel hot stamping technology becomes more and more mature and is widely applied to the field of automobiles. Due to the ultrahigh strength of the hot stamping part, the subsequent trimming and punching processing is widely performed by adopting laser cutting, but the laser cutting has the defects of high cost and low efficiency, so that the mechanical trimming and punching process of the hot stamping part is always a key direction for enterprises and college students to break through. However, the strength and hardness of the part after hot stamping are very high, so that the wear and tipping of the cold trimming and punching cutter are very serious, and microcracks and macrocracks are easily formed at the fracture, thus the service performance of the part is seriously influenced, and the development of the cold trimming and punching technology is greatly limited.
The technology has the outstanding advantages that the fracture quality of hot-cut hot-stamped parts in the die is good, the delayed cracking performance is improved, the blanking force required by hot cutting is small, blanking is relatively easy, the service life of a cutter is long, and a set of blanking die does not need to be developed independently. In addition, the hot stamping and the blanking are combined in one process, so that a large number of processes of feeding, blanking and positioning are omitted, and the production efficiency is improved. However, hot cutting is very sensitive to the change of process parameters, and the selection of the process parameters greatly affects the fracture quality and performance, thereby affecting the service performance of parts, so that the determination of the optimal process parameters is very important.
Chinese patents CN103143630A (201306), CN103934360A (201407) and CN108372235A (201808) successively disclose structural forms of high-strength steel hot forming and hot trimming and punching composite dies, and better realize the integration of two processes, and the common feature of the dies is that the die structure is relatively fixed, so that the dies have a strong guiding significance for designing and manufacturing hot stamping dies with known process parameters. However, in the experimental exploration stage of the optimal technological parameters of the hot forming and the hot trimming of the high-strength steel, if the hot forming, trimming and punching experiments are performed by adopting the above die structures, the difficulties of difficult modification of the die structure, low efficiency, higher cost and the like can be encountered, and the feasibility of the die structure in the actual experiments can be greatly reduced.
Therefore, an experimental mold suitable for searching the optimal technological parameters of hot forming and hot trimming of high-strength steel is urgently needed, and the structural form of the experimental mold is flexible enough, so that various working conditions in the hot forming and hot trimming processes can be simulated efficiently and at low cost.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a hot forming and hot trimming composite process experimental die and a process method.
According to one aspect of the invention, the invention provides a thermal forming and thermal trimming composite process experiment mold which comprises a lower mold plate, a guide pillar, a buffer plate, a spring, a blank holder support plate, a convex mold cutter block, a blank holder block, a concave mold cutter block, an upper mold plate and a concave mold.
Preferably, the male die is provided with a male die cooling water channel and a male die temperature measuring hole.
Preferably, the female die is provided with a female die cooling water channel and a female die temperature measuring hole.
Preferably, the male die cutter block is provided with a hole for heating or cooling the male die cutter block and a temperature measuring hole of the male die cutter block.
Preferably, the female die cutter block is provided with a hole for heating or cooling the female die cutter block and a temperature measuring hole of the female die cutter block.
Preferably, the edge pressing block is provided with an edge pressing gap adjusting column which is detachably connected with the edge pressing block; and a blank pressing gap adjusting column limiting plate is arranged at the position, corresponding to the blank pressing gap adjusting column, on the female die.
Preferably, heat insulation plates are arranged between the male die and the buffer plate and between the female die and the upper die plate.
Preferably, a heat insulation plate is arranged between the female die and the blank pressing gap adjusting column limiting plate.
Preferably, the female die cutter block is provided with a groove which is matched with the male die cutter block in shape and can accommodate the male die cutter block.
According to another aspect of the present invention, there is provided a hot forming and hot trimming process method using the experimental mold for hot forming and hot trimming composite process, comprising the steps of:
s1, preparing a plate material: selecting the size of a plate according to the sizes of the male die and the female die, and obtaining the plate from the base material in a linear cutting mode and the like;
s2, austenitizing the plate: putting the cut plate into a heating furnace for heating and heat preservation to ensure that the plate is completely austenitized;
s3, transferring the plate: taking out the completely austenitized plate from the heating furnace and quickly transferring the plate to a hot forming and hot trimming composite process experiment mold, wherein most of the area of the plate is in a suspended state at the moment, and only the edge part of the plate is in lap joint with the edge pressing block;
s4, hot forming of the plate: closing the die according to a set stamping speed, namely, the female die moves downwards along the guide post according to the set stamping speed so that the female die and the male die are closed, and finishing the hot forming process of the plate;
s5, hot trimming of the plate: when the sheet is formed to the position in contact with the male die cutter block and the female die cutter block, hot trimming is started, the female die continues to move downwards along the guide post, and the hot trimming process is completed through the male die cutter block and the female die cutter block;
s6, pressure maintaining and quenching: and after finishing the hot trimming, finishing the pressure maintaining quenching according to the set pressure maintaining pressure and pressure maintaining time to obtain the final part.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention has simple and compact structure, integrates the two procedures of hot forming and hot trimming, saves a large number of procedures of feeding, blanking and positioning and improves the production efficiency.
2. The spring is detachably connected with the lower die plate and the blank holder supporting plate, so that the assembly and disassembly are convenient, different blank holder force conditions can be conveniently realized by replacing springs of different types, and the influence rule of the blank holder force on the hot forming result is convenient to explore.
3. The blank pressing gap adjusting column is detachably connected with the blank pressing block, and is convenient and quick to replace, different blank pressing gap conditions can be realized by using the blank pressing gap adjusting columns with different heights and combining the limiting effect of the blank pressing gap adjusting column limiting plate, and therefore the influence rule of the blank pressing gap on the hot forming result is convenient to explore.
4. The male die cutter block and the female die cutter block can be detached and replaced, and the independent material selection and processing of the cutter blocks are convenient, so that different trimming gap conditions are flexibly realized, and the influence rule of the trimming gap on the hot trimming result is convenient to explore.
5. Heating/cooling holes are distributed on the male die cutter block and the female die cutter block, the temperature is changed by inserting heating rods or introducing cooling water, hot trimming experiments at different trimming temperatures are conveniently realized, and meanwhile, temperature measuring holes are distributed on the cutter blocks, so that real-time monitoring of the trimming temperatures is realized.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
fig. 1 is a schematic perspective view of the present invention.
FIG. 2 is a front view of the present invention.
FIG. 3 is a schematic partial elevational view of the male and female dies of the invention at the beginning of the hot trimming operation.
Fig. 4 is an enlarged view of a portion of fig. 3 within the area of the dashed circle.
FIG. 5 is a schematic partial front view of the male and female dies of the invention after completion of the hot trimming.
Fig. 6 is an enlarged view of a portion of fig. 5 within the area of the dashed circle.
The figures show that:
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.
The invention provides a thermoforming and hot trimming composite process experiment die which comprises a lower die plate 1, a guide pillar 2, a buffer plate 3, a spring 4, a blank holder support plate 5, a male die 6, a male die cutter block 7, a blank holder block 8, a female die cutter block 10, an upper die plate 11 and a female die 12, wherein the male die 6 is sequentially and fixedly connected with the buffer plate 3 and the lower die plate 1, the male die 6 is provided with the male die cutter block 7, the female die 12 is fixedly connected with the upper die plate 11, the female die 12 is provided with the female die cutter block 10 matched with the male die cutter block 7, the guide pillar 2 sequentially penetrates through the lower die plate 1, the blank holder support plate 5 and the upper die plate 11 can slide along the guide pillar 2, the spring 4 is detachably connected between the blank holder support plate 5 and the lower die plate 1, and the blank holder support plate 5 is provided. The middle of the blank pressing block supporting plate 5 is hollow, and the male die 6 penetrates through the hollow in the middle of the blank pressing block supporting plate 5.
And the male die 6 is provided with a male die cooling water channel 61 and a male die temperature measuring hole 62. And the female die 12 is provided with a female die cooling water channel 121 and a female die temperature measuring hole 122. The male die cutter block 7 is provided with a hole 71 for heating or cooling the male die cutter block and a temperature measuring hole 72 of the male die cutter block. The female die cutter block 10 is provided with a female die cutter block heating or cooling hole 101 and a female die cutter block temperature measuring hole 102. The edge pressing block 8 is provided with an edge pressing gap adjusting column 15, and the edge pressing gap adjusting column 15 is detachably connected with the edge pressing block 8; and a blank pressing gap adjusting column limiting plate 14 is arranged on the female die 12 at a position corresponding to the blank pressing gap adjusting column 15. And heat insulation plates 13 are arranged between the male die 6 and the buffer plate 3 and between the female die 12 and the upper die plate 11. And a heat insulation plate 13 is arranged between the female die 12 and the blank pressing gap adjusting column limiting plate 14. And a groove which is matched with the shape of the male die cutter block 7 and can accommodate the male die cutter block 7 is arranged on the female die cutter block 10.
The spring 4 can be quickly replaced according to the experiment requirement so as to realize different blank holder force conditions; the blank holder clearance adjusting column 15 can be quickly replaced to realize different blank holder clearance conditions; the male die cutter block 7 and the female die cutter block 10 can be rapidly replaced according to experimental requirements so as to realize different trimming gap conditions. The heating rod is inserted into the hole 71 for heating or cooling the male die cutter block and the hole 101 for heating or cooling the female die cutter block or cooling water is introduced into the holes to realize the combined processing of different temperatures of the cutter blocks; the temperature of hot forming and hot trimming is monitored in real time through the male die temperature measuring hole 62, the female die temperature measuring hole 122, the male die cutter block temperature measuring hole 72 and the female die cutter block temperature measuring hole 102.
According to the hot forming and hot trimming process method for the experimental die by utilizing the hot forming and hot trimming composite process, which is provided by the invention, the hot forming and hot trimming process method comprises the following steps:
s1, preparing a plate material: selecting the size of a plate material 9 according to the sizes of the male die 6 and the female die 12, and obtaining the plate material from a base material in a wire cutting mode and the like;
s2, austenitizing the plate: putting the cut plate 9 into a heating furnace for heating and heat preservation to ensure that the plate is completely austenitized;
s3, transferring the plate: taking out the completely austenitized plate 9 from the heating furnace and quickly transferring the plate 9 to a hot forming and hot trimming composite process experiment mold, wherein most areas of the plate 9 are in a suspended state at the moment, and only the edge parts are in lap joint with the edge pressing blocks 8;
s4, hot forming of the plate: closing the die according to a set punching speed, namely, the female die 12 moves downwards along the guide post 2 according to a set speed to close the female die 12 and the male die 6, so that the hot forming process of the sheet material 9 is completed;
s5, hot trimming of the plate: when the sheet material 9 is formed to the position contacted with the male die cutter block 7 and the female die cutter block 10, hot trimming is started, the female die 12 continues to move downwards along the guide post 2, and the hot trimming process is finished through the male die cutter block 7 and the female die cutter block 10;
s6, pressure maintaining and quenching: and after finishing the hot trimming, finishing the pressure maintaining quenching according to the set pressure maintaining pressure and pressure maintaining time to obtain the final part.
The preferred embodiment:
a hot forming and hot trimming composite process experiment mould, in particular to a high-strength steel hot forming and hot trimming composite process experiment mould, which is used for solving the problems that the structural form of the existing composite mould is relatively fixed, the change is difficult, and the optimal process parameter exploration and optimization are not facilitated. The high-strength steel is high-strength steel plate and is brand Q460 steel. As shown in fig. 1-6, a high-strength steel hot forming and hot trimming composite process experimental die for exploring the optimal process parameters of the high-strength steel hot forming and hot trimming composite process comprises a lower die plate 1, a guide pillar 2, a buffer plate 3, a spring 4, a blank holder block support plate 5, a male die 6, a male die cooling water channel 61, a male die temperature measurement hole 62, a male die cutter block 7, a male die cutter block heating (cooling) hole 71, a male die cutter block temperature measurement hole 72, a blank holder block 8, a female die cutter block 10, a female die cutter block heating (cooling) hole 101, a female die cutter block temperature measurement hole 102, an upper die plate 11, a female die 12, a female die cooling water channel 121, a female die temperature measurement hole 122, a heat insulation plate 13, a blank holder gap adjusting column limit plate 14 and a blank holder gap adjusting column 15.
The male die 6 is fixed with the lower die plate 1 through the heat insulation plate 13 and the buffer plate 3 by bolts; a male die cooling water channel 61 and a male die temperature measuring hole 62 are formed in the male die 6; the female die 12 is fixed with the upper template 11 through a heat insulation plate 13 by bolts; the male die cutter block 7 is fixed on the male die 6 through a bolt; a hole 71 for heating or cooling the male die cutter block and a temperature measuring hole 72 of the male die cutter block are formed in the male die cutter block 7; a concave die cooling water channel 121 and a concave die temperature measuring hole 122 are formed in the concave die 12; the female die cutter block 10 is fixed on the female die 12 through a bolt; a concave die cutter block heating or cooling hole 101 and a concave die cutter block temperature measuring hole 102 are formed in the concave die cutter block 10; the edge pressing block supporting plate 5 is fixed with the lower template 1 through a spring 4 by using an equal-height bolt; circular grooves are formed in the contact parts of the lower template 1 and the blank holder supporting plate 5 with the springs 4; the edge pressing block 8 is fixed on the edge pressing block supporting plate 5 through bolts; the center of the edge pressing block 8 is provided with a hole for inserting an edge pressing gap adjusting column 15; the blank pressing clearance adjusting column limiting plate 14 is fixed with the female die 12 through the heat insulation plate 14 by bolts; the guide post 2 passes through the lower template 1, the blank holder supporting plate 5 and the upper template 11 through clearance fit.
The spring 4 is movably connected with the lower template 1 and the blank holder supporting plate 5 through circular grooves, so that the assembly and disassembly are convenient, different blank holder force conditions can be conveniently realized by replacing the springs 4 with different types, and the influence rule of the blank holder force on the hot forming result is convenient to explore; the blank pressing clearance adjusting column 15 is inserted into the blank pressing block 8 through hole-shaft clearance fit, is convenient and quick to replace, and different blank pressing clearance conditions can be realized by using the blank pressing clearance adjusting column 15 with different heights and combining the limiting effect of the blank pressing clearance adjusting column limiting plate 14, so that the influence rule of the blank pressing clearance on the hot forming result can be conveniently explored.
The male die cutter block 7 and the female die cutter block 10 are respectively connected with the male die 6 and the female die 12 through bolts, so that the independent material selection and processing of the cutter blocks are facilitated, different trimming gap conditions can be flexibly realized, and the influence rule of the trimming gap on the hot trimming result is conveniently explored; heating/cooling holes are distributed on the male die cutter block 7 and the female die cutter block 10, hot trimming experiments at different trimming temperatures can be conveniently realized by inserting heating rods or introducing cooling water, and meanwhile, temperature measuring holes are distributed on the cutter blocks, so that real-time monitoring of trimming temperatures is realized.
The technological method for testing the hot forming and the hot trimming of the die by utilizing the high-strength steel hot forming and hot trimming composite technology comprises the following steps: firstly, preparing a plate material: determining the proper size of the high-strength steel plate according to the sizes of the male die and the female die, and obtaining the high-strength steel plate from the base material in a wire cutting mode and the like; secondly, austenitizing the plate material: putting the prepared plate into a heating furnace for heating and heat preservation to ensure that the plate is completely austenitized; thirdly, rapidly transferring the plate material: taking out the completely austenitized plate from the heating furnace and quickly transferring the plate to a hot forming and hot trimming composite process experiment mold, wherein most areas of the plate are in a suspended state at the moment, and only the edge part is in lap joint with a blank holder block, as shown in fig. 1 and 2; fourthly, hot forming of the plate: as shown in fig. 2-4, the die is closed according to the set punching speed, and the hot forming process of the plate is completed; fifthly, hot trimming of the plate: as shown in fig. 3-6, when the sheet is formed to the position where the sheet is in contact with the male die cutter block and the female die cutter block, hot trimming starts, and the female die continues to move downwards, so that the hot trimming process is completed; sixthly, pressure maintaining and quenching: and as shown in fig. 5-6, after the hot trimming is finished, the pressure-maintaining quenching is finished according to the set pressure-maintaining force and pressure-maintaining time, and the final part is obtained.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (6)
1. A thermoforming and hot trimming composite process experiment mould is characterized by comprising a lower template (1), a guide post (2), a buffer plate (3), a spring (4), a blank holder support plate (5), a male mould (6), a male mould cutter block (7), a blank holder block (8), a female mould cutter block (10), an upper template (11) and a female mould (12), wherein the male mould (6) is sequentially and tightly connected with the buffer plate (3) and the lower template (1), the male mould (6) is provided with the male mould cutter block (7), the female mould (12) is tightly connected with the upper template (11), the female mould (12) is provided with the female mould cutter block (10) matched with the male mould cutter block (7), the guide post (2) sequentially penetrates through the lower template (1), the blank holder support plate (5) and the upper template (11) can slide along the guide post (2), a spring (4) is detachably connected between the edge pressing block supporting plate (5) and the lower template (1), and an edge pressing block (8) is arranged on the edge pressing block supporting plate (5);
the female die cutter block (10) is provided with a groove which is matched with the male die cutter block (7) in shape and can accommodate the male die cutter block (7);
the male die cutter block (7) is provided with a heating or cooling hole (71) of the male die cutter block and a temperature measuring hole (72) of the male die cutter block;
a concave die cutter block heating or cooling hole (101) and a concave die cutter block temperature measuring hole (102) are formed in the concave die cutter block (10);
the edge pressing block (8) is provided with an edge pressing gap adjusting column (15), and the edge pressing gap adjusting column (15) is detachably connected with the edge pressing block (8); and a blank pressing gap adjusting column limiting plate (14) is arranged on the female die (12) at a position corresponding to the blank pressing gap adjusting column (15).
2. The experimental hot forming and hot trimming composite process die according to claim 1, wherein the male die (6) is provided with a male die cooling water channel (61) and a male die temperature measuring hole (62).
3. The experimental mould for the hot forming and hot trimming composite process according to claim 1, characterized in that the female die (12) is provided with a female die cooling water channel (121) and a female die temperature measuring hole (122).
4. The experimental hot forming and hot trimming composite process die according to claim 1, wherein heat insulation plates (13) are arranged between the male die (6) and the buffer plate (3) and between the female die (12) and the upper die plate (11).
5. The experimental mold for the hot forming and hot trimming composite process according to claim 1, characterized in that a heat insulation plate (13) is arranged between the female mold (12) and the blank holder clearance adjusting column limiting plate (14).
6. A hot forming and hot trimming process using the hot forming and hot trimming composite process experimental mold according to any one of claims 1 to 5, comprising the steps of:
s1, preparing a plate material: selecting the size of a plate (9) according to the sizes of the male die (6) and the female die (12), and obtaining the plate from the base material in a linear cutting mode;
s2, austenitizing the plate: putting the cut plate (9) into a heating furnace for heating and heat preservation to ensure that the plate is completely austenitized;
s3, transferring the plate: taking out the completely austenitized plate (9) from the heating furnace and quickly transferring the plate to a hot forming and hot trimming composite process experiment mold, wherein most areas of the plate (9) are in a suspended state at the moment, and only the edge part is in lap joint with the edge pressing block (8);
s4, hot forming of the plate: closing the dies according to a set punching speed, namely, the female die (12) moves downwards along the guide post (2) according to a set speed to close the female die (12) and the male die (6) so as to finish the hot forming process of the plate (9);
s5, hot trimming of the plate: when the sheet (9) is formed to the position where the sheet is contacted with the male die cutter block (7) and the female die cutter block (10), hot trimming is started, the female die (12) continues to move downwards along the guide post (2), and the hot trimming process is finished through the male die cutter block (7) and the female die cutter block (10);
s6, pressure maintaining and quenching: and after finishing the hot trimming, finishing the pressure maintaining quenching according to the set pressure maintaining pressure and pressure maintaining time to obtain the final part.
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| CN110465573B (en) * | 2019-08-23 | 2020-12-29 | 帝国理工创新有限公司 | Method for manufacturing lightweight thin-wall sheet metal part by taking data as guide |
| CN113134532A (en) * | 2020-01-17 | 2021-07-20 | 宝山钢铁股份有限公司 | Experimental device for be used for preparing gradient quenching tissue sheet material |
| CN111774472B (en) * | 2020-07-31 | 2022-02-11 | 重庆交通大学 | Floating support single-point progressive hot forming device |
| CN114074147A (en) * | 2020-08-18 | 2022-02-22 | 宝山钢铁股份有限公司 | Hot stamping die and method for realizing hot cutting function |
| CN112091051A (en) * | 2020-09-08 | 2020-12-18 | 彭清莲 | Precision punching die for parts |
| CN113042600B (en) * | 2021-03-30 | 2022-08-05 | 马鞍山钢铁股份有限公司 | Hot stamping device and hot stamping method suitable for Zn coating and adjustable in stamping stress |
| CN113909382B (en) * | 2021-08-31 | 2022-08-09 | 盐城诺焱科技有限公司 | Intelligent hardware compression mold suitable for high-end equipment manufacturing |
| CN114871780A (en) * | 2022-05-17 | 2022-08-09 | 南京云海轻金属精密制造有限公司 | Automatic finish trimming tool for die casting of automobile screen products |
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| JP2012143778A (en) * | 2011-01-11 | 2012-08-02 | Unipres Corp | Method for press-forming blank material |
| CN202114160U (en) * | 2011-05-03 | 2012-01-18 | 上海北特科技股份有限公司 | Thermoforming experimental mold with cooling water channel |
| CN202316761U (en) * | 2011-10-20 | 2012-07-11 | 平湖爱驰威汽车零部件有限公司 | Automobile cover die |
| CN103934360A (en) * | 2014-04-25 | 2014-07-23 | 吉林大学 | Hot stamping and warm blanking composite forming technology and mould for ultrahigh-strength steel |
| CN107042264B (en) * | 2017-03-17 | 2018-12-18 | 江苏华强模具科技有限公司 | A kind of drop stamping experiment mould |
| CN108372235B (en) * | 2018-02-12 | 2020-11-13 | 南京星乔威泰克汽车零部件有限公司 | Full-automatic hot stamping die and method for forming edge cutting of martensitic steel |
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