CN210523610U - Stamping die and stamping device - Google Patents
Stamping die and stamping device Download PDFInfo
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- CN210523610U CN210523610U CN201921623472.7U CN201921623472U CN210523610U CN 210523610 U CN210523610 U CN 210523610U CN 201921623472 U CN201921623472 U CN 201921623472U CN 210523610 U CN210523610 U CN 210523610U
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- 238000012546 transfer Methods 0.000 claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 64
- 238000010438 heat treatment Methods 0.000 claims description 31
- 239000007788 liquid Substances 0.000 claims description 11
- 238000004891 communication Methods 0.000 claims description 3
- 230000009969 flowable effect Effects 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 26
- 238000000034 method Methods 0.000 abstract description 21
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 229910000831 Steel Inorganic materials 0.000 description 13
- 239000010959 steel Substances 0.000 description 13
- 239000002184 metal Substances 0.000 description 6
- 238000005485 electric heating Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 230000005611 electricity Effects 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000011265 semifinished product Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model provides a stamping die and a stamping device, which relate to the technical field of die manufacturing, wherein the stamping die comprises an upper die, a blank holder and a lower die which are sequentially overlapped; a first circulating channel capable of realizing heat transfer with the lower die is arranged on the lower die; the first circulation passage is internally provided with a flowing medium. During stamping, friction heat and deformation heat can be generated among the upper die, the lower die, the blank holder and the plate; the flowing medium in the first circulation channel can absorb the heat, and the heat is uniformly distributed in the first circulation channel. The first circulation passage is capable of heat transfer with the lower mold. Meanwhile, the lower die can exchange heat with the plate through contact with the plate. The arrangement can ensure that the temperature of the plate material is kept by the friction heat, the contact heat and the heat exchange of the upper die, the lower die, the blank holder and the plate material when the plate material is stably produced in warm forming, so that less energy sources such as power consumption and the like are consumed in the stamping process, the manufacturing cost is reduced, and the environment protection is facilitated.
Description
Technical Field
The utility model belongs to the technical field of the mould manufacturing technique and specifically relates to a stamping die and stamping device are related to.
Background
A stamping die is a special technological device for processing materials (metal or nonmetal) into parts (or semi-finished products). Stamping is a press working method in which a die mounted on a press is used to apply pressure to a material at room temperature to cause separation or plastic deformation of the material, thereby obtaining a desired part.
In the prior art, in order to improve the formability of steel sheets and reduce cracking, increasing the temperature during steel forming is one of the approaches to improve the applicability of steel sheets. Currently, methods for heating steel sheets include induction heating, heating wire heating, and the like. After the steel plate is heated to a proper temperature, the steel plate is placed in a stamping die for processing. However, heating steel sheets requires a large amount of energy such as electricity, and is relatively expensive and environmentally undesirable.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a stamping die and stamping device to having alleviated that exists among the prior art and having heated the steel sheet to suitable temperature after, place the steel sheet again and handle in stamping die. However, heating steel sheets requires a large amount of energy such as electricity, and thus has a problem of high manufacturing cost and environmental pollution.
The utility model provides a stamping die, include: the device comprises an upper die, a lower die and a blank holder; the upper die, the blank holder and the lower die are sequentially overlapped; a first circulating channel capable of realizing heat transfer with the lower die is arranged on the lower die; the first circulation passage is internally provided with a flowing medium.
Furthermore, the stamping die also comprises a heating device and a controller; the heating device is used for heating the flowing medium, and the controller is used for controlling the heating device to be turned on and off.
Further, the stamping die also comprises a temperature sensor; the temperature sensor is connected with the controller; the temperature sensor is used for detecting the temperature value of the flowing medium and transmitting the temperature value to the controller, and when the temperature value is larger than a preset value, the controller controls the heating device to be closed.
Further, the flowing medium is a liquid; a water pump is arranged on the first circulating channel; the water pump is used for driving the liquid to circularly flow in the first circulating channel.
Further, the flowing medium is water; the first circulation channel is also provided with a steam release port; when the water temperature reaches 100 ℃, water vapor flows out from the steam release port.
Further, a second circulation channel capable of realizing heat transfer with the blank holder is arranged in the blank holder; the second circulation passage communicates with the first circulation passage.
Further, the second circulation channel is communicated with the first circulation channel through a water inlet pipe and a water outlet pipe; the water inlet pipe and the water outlet pipe extend along the height direction of the lower die, and the water inlet pipe and the water outlet pipe are telescopic pipes.
Further, a third circulating channel capable of realizing heat transfer with the upper die is arranged in the upper die; a flowing medium is arranged in the third circulating channel.
Furthermore, the third circulating channel is communicated with the first circulating channel through a water inlet connecting pipe and a water outlet connecting pipe.
Further, the utility model also provides a stamping device, stamping device includes stamping die.
The utility model provides a stamping die, in the use, the staff places the sheet material and carries out the punching press between last mould and bed die. In the stamping process, heat can be generated by the friction among the upper die, the lower die, the blank holder and the plate, and meanwhile, the plate can also generate deformation heat when deformed; however, the contact area between the plate and the die is different, so that the generated friction heat and deformation heat are not uniform. The flowing medium in the first circulating channel can absorb friction heat and deformation heat, and the heat is uniformly distributed in the first circulating channel through the flowing of the flowing medium in the first circulating channel. The first circulation channel can realize heat transfer with the lower die, namely heat of the flowing medium can be transferred to the lower die, and the lower die can exchange heat with the plate through contact with the plate in the stamping process, so that the heat is transferred to the plate. Therefore, by absorbing the frictional heat and the deformation heat, the temperature of the fluid medium can be maintained, and the temperature of the steel sheet can be maintained during warm forming. The arrangement of the stamping device can ensure that the temperature of the plate material is kept by the friction heat, the contact heat and the heat exchange of the upper die, the lower die, the blank holder and the plate material when the plate material is stably produced in warm forming, thereby realizing the purpose of using no or less external heat sources when the plate material is stably produced in warm forming.
Therefore, the arrangement of the stamping die can reduce the energy consumption of the sheet material in the stamping process, such as power consumption and the like, reduce the manufacturing cost and is beneficial to environmental protection.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a stamping die provided in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of the matching between the lower mold and the blank holder provided by the embodiment of the present invention;
fig. 3 is a schematic structural view of a blank holder according to an embodiment of the present invention;
fig. 4 is a top view of a lower mold provided in an embodiment of the present invention;
FIG. 5 is an enlarged view taken at A in FIG. 2;
fig. 6 is a schematic structural diagram of an upper mold provided in an embodiment of the present invention.
Icon: 1, mounting a mold; 2-lower mould; 3-blank holder; 4-a first circulation channel; 5-a heating device; 6-thermometer; 7-a steam release port; 8-a second circulation channel; 9-a water inlet pipe; 10-water outlet pipe; 11-a telescopic tube; 12-a third circulation channel; 13-a steam release conduit; 14-a first connection port; 15-a second connection port; 16-a water pump; 17-water channel.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
As shown in fig. 1-4, the embodiment of the present invention provides a stamping die, including: an upper die 1, a lower die 2 and a blank holder 3; the upper die 1, the blank holder 3 and the lower die 2 are sequentially overlapped; a first circulating channel 4 capable of realizing heat transfer with the lower die 2 is arranged on the lower die 2; the first circulation channel 4 is internally provided with a flowing medium.
Wherein, the upper die 1, the lower die 2 and the blank holder 3 are made of metal materials capable of conducting heat.
Specifically, a groove is formed in the lower die 2, and the blank holder 3 is embedded into the groove, so that the lower die 2 is connected with the blank holder 3.
Preferably, the first circulating channel is a first metal pipe, and the first metal pipe penetrates through one end of the lower mold 2 and penetrates out of the other end of the lower mold 2, so that the time for uniformly transferring heat between the lower mold 2 and the flowing medium can be shortened, and the heat transfer efficiency can be improved.
The flowing medium may be a gas that can flow in the first circulation channel 4 to transfer heat.
When the flowing medium is liquid, the liquid should be at a proper water level, so that the flowing medium exists everywhere in the first circulating channel 4, so that the flowing medium can rapidly transfer heat, and the heat can be uniformly distributed in the first circulating channel 4.
The embodiment of the utility model provides a stamping die, include: an upper die 1, a lower die 2 and a blank holder 3; the upper die 1, the blank holder 3 and the lower die 2 are sequentially overlapped; a first circulating channel 4 capable of realizing heat transfer with the lower die 2 is arranged on the lower die 2; the first circulation channel 4 is internally provided with a flowing medium. In the use process, a worker places the plate between the upper die 1 and the lower die 2 for stamping. In the stamping process, heat can be generated by the friction among the upper die 1, the lower die 2, the blank holder 3 and the plate, and deformation heat can be generated when the plate deforms; however, the contact area between the plate and the die is different, so that the generated friction heat and deformation heat are not uniform. The flowing medium in the first circulation passage 4 can absorb frictional heat and deformation heat, and the heat is uniformly distributed in the first circulation passage 4 by the flow of the flowing medium in the first circulation passage 4. The first circulation channel 4 can be in heat transfer with the lower die 2, that is, heat of the flowing medium can be transferred to the lower die 2, and the lower die 2 can exchange heat with the sheet material through contact with the sheet material during the stamping process, so that the heat can be transferred to the sheet material. Therefore, by absorbing the frictional heat and the deformation heat, the temperature of the fluid medium can be maintained, and the temperature of the steel sheet can be maintained during warm forming. The arrangement of the stamping device can ensure that the temperature of the plate can be kept by the friction heat, the contact heat and the heat exchange of the upper die 1, the lower die 2, the blank holder 3 and the plate when the plate is stably produced in warm forming, thereby realizing the purpose of using no or less external heat sources when the plate is stably produced in warm forming.
Therefore, the arrangement of the stamping die can reduce the energy consumption of the sheet material in the stamping process, such as power consumption and the like, reduce the manufacturing cost and is beneficial to environmental protection.
As shown in fig. 1, fig. 2 and fig. 4, on the basis of the above embodiment, further, the stamping die further includes a heating device 5 and a controller; the heating device 5 is used for heating the flowing medium, and the controller is used for controlling the heating device 5 to be switched on and off.
Wherein, the heating device 5 can be an infrared heater or an electric heating tube, etc.
When the heating device 5 is an electric heating tube, the electric heating tube is wound on the outer wall of the first circulation channel 4 to heat the flowing medium. The electric heating pipe has lower installation cost and higher stability during working.
The heating device 5 and the controller may be electrically connected.
Specifically, the stamping die further includes a thermometer 6, and the thermometer 6 is used for detecting the temperature of the flowing medium. The staff can know the temperature of flowing medium in real time through observing the data of thermometer 6, and when the temperature reached preset numerical value, the staff controlled heating device 5 through the controller and closed.
In this embodiment, in the use process, when the stamping die starts to produce, in order to enable the temperature of the flowing medium to reach the working temperature as soon as possible, the controller controls the heating device 5 to be turned on to heat the flowing medium, and when the preset working temperature is reached, the controller controls the heating device 5 to be turned off, so that energy is saved.
On the basis of the above embodiment, further, the stamping die further comprises a temperature sensor; the temperature sensor is connected with the controller; the temperature sensor is used for detecting the temperature value of the flowing medium and transmitting the temperature value to the controller, and when the temperature value is larger than a preset value, the controller controls the heating device 5 to be closed.
Wherein, the temperature sensor is electrically connected with the controller.
In this embodiment, when the stamping die starts to produce, in order to enable the temperature of the flowing medium to reach the working temperature as soon as possible, the controller controls the heating device 5 to be turned on to heat the flowing medium, in the heating process, the temperature sensor detects the temperature value of the flowing medium and transmits the temperature value to the controller, and when the temperature value is greater than the preset value, the controller controls the heating device 5 to be turned off to save energy. The temperature sensor can ensure that the temperature control is more automatic, thereby saving manpower.
As shown in fig. 1 and fig. 2, on the basis of the above embodiment, further, the flowing medium is a liquid; the first circulation channel 4 is provided with a water pump 16; the water pump 16 is used for driving the liquid to circulate in the first circulation passage 4.
In this embodiment, the water pump 16 is used to drive the liquid to circulate in the first circulation path 4 during use. The arrangement of the water pump 16 can accelerate the flowing speed of the liquid in the first circulating channel 4, thereby shortening the time for uniformly distributing the heat of the flowing medium in the first circulating channel 4 and improving the stamping efficiency.
As shown in fig. 1, fig. 2 and fig. 4, in addition to the above embodiment, the flowing medium is water; the first circulation channel 4 is also provided with a steam release port 7; when the water temperature reaches 100 ℃, the water vapor flows out from the steam release port 7.
Specifically, the first circulation passage 4 includes a water passage 17 and a steam release pipe 13. The steam release opening 7 is arranged on the steam release pipe 13, the steam release pipe 13 is arranged perpendicular to the water channel 17, and the horizontal height of the steam release opening 7 is higher than the height of the water channel 17 when the lower die 2 works so as to prevent water from flowing out of the steam release opening 7. In addition, the steam release port 7 should be located outside the lower mold 2 to discharge the steam to the outside of the lower mold 2.
Since the water temperature becomes steam when reaching 100 ℃, the temperature of the first circulation path 4 is always maintained at 95-99 ℃ during the warm forming stable production.
In this embodiment, during the use, the temperature of the water inside the first circulation passage 4 is continuously increased, and when the temperature of the water is increased to 100 ℃, the water is changed into water vapor and flows out from the steam release port 7. The cost of using water as the flowing medium is low, and the water vapor can not cause pollution when being discharged into the atmosphere. In addition, the arrangement of the water and steam release port 7 can set an upper limit on the temperature of the first circulating channel 4, so that the temperature of the first circulating channel 4 cannot exceed 100 ℃, and the function of automatically regulating and controlling the temperature is achieved.
As shown in fig. 3, on the basis of the above embodiment, further, a second circulation channel 8 capable of realizing heat transfer with the blank holder 3 is arranged in the blank holder 3; the second circulation passage 8 communicates with the first circulation passage 4.
The second circulation channel 8 can be a second metal pipeline, the second metal pipeline penetrates from one end of the blank holder 3 and penetrates out from the other end of the blank holder 3, so that the time for uniform heat transfer between the blank holder 3 and a flowing medium can be shortened, and the heat transfer efficiency is improved.
In this embodiment, in the use process, the second circulation channel 8 can realize heat transfer with the blank holder 3, that is, the heat of the flowing medium can be transferred to the blank holder 3, and in the stamping process, the blank holder 3 can exchange heat with the sheet material through the contact with the sheet material, so as to transfer the heat to the sheet material. The second circulation channel 8 can accelerate the heat transfer to the working surface of the die, and the warm forming efficiency of the plate is improved.
As shown in fig. 5, on the basis of the above embodiment, further, the second circulation channel 8 is communicated with the first circulation channel 4 through a water inlet pipe 9 and a water outlet pipe 10; the water inlet pipe 9 and the water outlet pipe 10 extend along the height direction of the lower die 2, and the water inlet pipe 9 and the water outlet pipe 10 are both telescopic pipes 11.
In this embodiment, in the stamping process, because the blank holder 3 and the lower mold 2 can move up and down relatively, that is, the blank holder 3 can move in the direction perpendicular to the lower mold 2, the arrangement of the telescopic tube 11 can ensure the circulation of the flowing medium under the condition of ensuring the normal stamping operation. The water inlet pipe 9 and the water outlet pipe 10 are not interfered with each other, so that the flowing medium can enter and exit, and the flowing medium is favorably circulated.
As shown in fig. 6, in addition to the above embodiment, a third circulation channel 12 capable of realizing heat transfer with the upper die 1 is further provided inside the upper die 1; the third circulation passage 12 is provided with a flowing medium therein.
Specifically, the third circulation channel 12 may be formed by surrounding a plurality of partition plates inside the upper mold 1, and the partition plates are provided with through holes for flowing the flowing medium.
Or the third circulation passage 12 may be an annular third metal pipe.
The flowing medium may be a gas or a liquid.
In this embodiment, in the use process, the third circulation channel 12 can realize heat transfer with the upper die 1, that is, the heat of the flowing medium can be transferred to the upper die 1, and in the stamping process, the upper die 1 can exchange heat with the sheet material through the contact with the sheet material, so as to transfer the heat to the sheet material. The third circulation channel 12 can accelerate the heat transfer to the working surface of the die, and the warm forming efficiency of the plate is improved.
As shown in fig. 1, in addition to the above embodiment, further, the third circulation channel 12 is communicated with the first circulation channel 4 through a water inlet connection pipe and a water outlet connection pipe.
Specifically, the first circulation channel 4 is provided with two first connection ports 14, and the second circulation channel 8 is provided with two second connection ports 15. One end of the water inlet connecting pipe and one end of the water outlet connecting pipe are respectively connected with the two first connecting ports 14, and the other end of the water inlet connecting pipe and the other end of the water outlet connecting pipe are respectively connected with the two second connecting ports 15.
In this embodiment, the third circulation passage 12 is provided in communication with the first circulation passage 4 so that the temperature of the flowing medium in the third circulation passage 12 and the temperature of the flowing medium in the first circulation passage 4 can be kept uniform. In addition, the water inlet connecting pipe and the water outlet connecting pipe are not interfered with each other, so that the flowing medium can enter and exit, and the circulation of the flowing medium is facilitated.
On the basis of the above embodiment, it is further that the embodiment of the utility model provides a stamping device is still provided, and stamping device includes stamping die.
In this embodiment, in the using process, a worker places a plate between the upper die 1 and the lower die 2 to perform stamping. In the stamping process, heat can be generated by the friction among the upper die 1, the lower die 2, the blank holder 3 and the plate, and deformation heat can be generated when the plate deforms; however, the contact area between the plate and the die is different, so that the generated friction heat and deformation heat are not uniform. The flowing medium in the first circulation passage 4 can absorb frictional heat and deformation heat, and the heat is uniformly distributed in the first circulation passage 4 by the flow of the flowing medium in the first circulation passage 4. The first circulation channel 4 can be in heat transfer with the lower die 2, that is, heat of the flowing medium can be transferred to the lower die 2, and the lower die 2 can exchange heat with the sheet material through contact with the sheet material during the stamping process, so that the heat can be transferred to the sheet material. Therefore, by absorbing the frictional heat and the deformation heat, the temperature of the fluid medium can be maintained, and the temperature of the steel sheet can be maintained during warm forming. The arrangement of the stamping device can ensure that the temperature of the plate can be kept by the friction heat, the contact heat and the heat exchange of the upper die 1, the lower die 2, the blank holder 3 and the plate when the plate is stably produced in warm forming, thereby realizing the purpose of using no or less external heat sources when the plate is stably produced in warm forming.
Therefore, the arrangement of the stamping device can reduce the energy consumption of the sheet material in the stamping process, such as power consumption and the like, reduce the manufacturing cost and is beneficial to environmental protection.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled 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; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (10)
1. A stamping die, comprising: the device comprises an upper die, a lower die and a blank holder;
the upper die, the blank holder and the lower die are sequentially stacked; the lower die is provided with a first circulating channel capable of realizing heat transfer with the lower die; the first circulation channel is internally provided with a flowing medium.
2. The stamping die of claim 1, further comprising a heating device and a controller;
the heating device is used for heating the flowing medium, and the controller is used for controlling the heating device to be turned on and off.
3. The stamping die of claim 2, further comprising a temperature sensor;
the temperature sensor is connected with the controller; the temperature sensor is used for detecting the temperature value of the flowing medium and transmitting the temperature value to the controller, and when the temperature value is larger than a preset value, the controller controls the heating device to be closed.
4. The stamping die of claim 1, wherein the flowable medium is a liquid;
a water pump is arranged on the first circulating channel; the water pump is used for driving liquid to circularly flow in the first circulating channel.
5. The stamping die of claim 4, wherein the flowing medium is water; the first circulating channel is also provided with a steam release port;
when the water temperature reaches 100 ℃, water vapor flows out from the steam release port.
6. The stamping die of claim 1, wherein a second circulation channel is disposed within the blankholder capable of heat transfer with the blankholder;
the second circulation passage communicates with the first circulation passage.
7. The stamping die of claim 6, wherein the second circulation channel is in communication with the first circulation channel through a water inlet pipe and a water outlet pipe;
the water inlet pipe and the water outlet pipe extend along the height direction of the lower die, and the water inlet pipe and the water outlet pipe are telescopic pipes.
8. The stamping die of claim 7, wherein the upper die is internally provided with a third circulation channel capable of achieving heat transfer with the upper die;
and a flowing medium is arranged in the third circulating channel.
9. The stamping die of claim 8, wherein the third circulation passage is in communication with the first circulation passage through a water inlet connection pipe and a water outlet connection pipe.
10. A stamping device, characterized in that the stamping device comprises a stamping die according to any of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921623472.7U CN210523610U (en) | 2019-09-26 | 2019-09-26 | Stamping die and stamping device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921623472.7U CN210523610U (en) | 2019-09-26 | 2019-09-26 | Stamping die and stamping device |
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| CN210523610U true CN210523610U (en) | 2020-05-15 |
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| CN201921623472.7U Active CN210523610U (en) | 2019-09-26 | 2019-09-26 | Stamping die and stamping device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110465595A (en) * | 2019-09-26 | 2019-11-19 | 天津职业技术师范大学(中国职业培训指导教师进修中心) | Stamping die and stamping device |
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2019
- 2019-09-26 CN CN201921623472.7U patent/CN210523610U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110465595A (en) * | 2019-09-26 | 2019-11-19 | 天津职业技术师范大学(中国职业培训指导教师进修中心) | Stamping die and stamping device |
| CN110465595B (en) * | 2019-09-26 | 2024-11-01 | 天津职业技术师范大学(中国职业培训指导教师进修中心) | Stamping die and stamping device |
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| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: TIANJIN KAINUO INDUSTRIAL Co.,Ltd. Assignor: TIANJIN University OF TECHNOLOGY AND EDUCATION (CHINA VOCATIONAL TRAINING INSTRUCTOR TRAINING CENTER) Contract record no.: X2024980003825 Denomination of utility model: Stamping molds and stamping devices Granted publication date: 20200515 License type: Common License Record date: 20240402 |
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