阅读说明：本技术 一种热冲压方法 (Hot stamping method ) 是由 马闻宇 杨建炜 章军 郑学斌 姚野 张永强 于 2020-05-11 设计创作，主要内容包括：本发明公开了一种热冲压方法,包括：对成形件进行仿真模拟,获得第一冷冲压模具的预冲压成形量和第二冷冲压模中不同位置的冷却水分布信息、冷却水流速信息和冷却水温度信息；基于预冲压成形量控制第一冷冲压模具对板料进行预冲压；将预冲压后的零件放置于加热炉中进行加热保温,使得预冲压件完全奥氏体化；将奥氏体化后的零件转移到第二冷冲压模具中进行冲压成形,并进行冷却淬火；在进行冷却淬火时,基于冷却水分布、流速和温度信息,控制第二冷冲压模具的不同位置的冷却水分布、流速和温度,以使得第二冷冲压模中不同位置的冷却能力不同。如此,零件的性能获得明显分区,零件的不同部位强度明显不同,从而提高零件的抗撞性能和吸能性能。(The invention discloses a hot stamping method, which comprises the following steps: carrying out simulation on a formed part to obtain the pre-stamping forming amount of a first cold stamping die and cooling water distribution information, cooling water flow rate information and cooling water temperature information of different positions in a second cold stamping die; controlling a first cold stamping die to perform pre-stamping on the plate based on the pre-stamping forming amount; placing the pre-stamped part in a heating furnace for heating and heat preservation so that the pre-stamped part is completely austenitized; transferring the austenitized part into a second cold stamping die for stamping and forming, and cooling and quenching; and when cooling quenching is carried out, controlling the distribution, the flow rate and the temperature of the cooling water at different positions of the second cold stamping die based on the distribution, the flow rate and the temperature information of the cooling water, so that the cooling capacities at different positions in the second cold stamping die are different. Therefore, the performance of the part is obviously partitioned, and the strength of different parts of the part is obviously different, so that the anti-collision performance and the energy absorption performance of the part are improved.)

1. A hot stamping method, comprising:

carrying out simulation on a formed part to obtain the pre-stamping forming amount of a first cold stamping die and cooling water distribution information, cooling water flow rate information and cooling water temperature information of different positions in a second cold stamping die;

controlling the first cold stamping die to perform pre-stamping on the plate material based on the pre-stamping forming amount;

placing the pre-stamped part in a heating furnace for heating and heat preservation so that the pre-stamped part is completely austenitized;

transferring the austenitized part into a second cold stamping die for stamping and forming;

cooling and quenching the part subjected to stamping forming through the second cold stamping die; wherein, when the cooling quenching is performed, the cooling water distribution, the cooling water flow rate, and the cooling water temperature at different positions of the second cold press die are controlled based on the cooling water distribution information, the cooling water flow rate information, and the cooling water temperature information, so that the cooling capacities at different positions in the second cold press die are different.

2. The method of claim 1, wherein the simulating the shaped part to obtain the pre-press forming amount of the first cold-press die comprises:

acquiring shape information of the formed piece;

acquiring mechanical property information of the plate, wherein the mechanical property information comprises stress-strain relations of materials at different temperatures and stress-strain relations of materials at different strain rates;

and inputting the shape information and the mechanical property information into simulation software to perform pre-stamping simulation, so as to obtain the pre-stamping forming amount.

3. The method of claim 2, wherein the simulating the formed part to obtain cooling water distribution information, cooling water flow rate information, and cooling water temperature information at different positions in the second cold stamping die comprises:

inputting the shape information and the mechanical property information into simulation software for collision simulation to obtain microstructure distribution information of different positions of the formed part;

and obtaining cooling water distribution information, cooling water flow rate information and cooling water temperature information of different positions in the second cold stamping die based on the microstructure distribution information.

4. The method of claim 1, wherein prior to said controlling said first cold stamping die to pre-stamp the sheet based on said amount of pre-stamping forming, further comprising:

cutting the plate;

and placing the cut plate in the first cold stamping die.

5. The method of claim 1, wherein the temperature of the heat soak is greater than 830 ℃.

6. The method according to any one of claims 1 to 5, wherein a plurality of cooling ducts are provided in the second cold stamping die, the plurality of cooling ducts are located at different positions, the on-off state of each cooling duct can be controlled individually, the flow rate of cooling water in each cooling duct can be controlled individually, and the temperature of cooling water in each cooling duct can be controlled individually.

7. The method of claim 6, wherein the controlling the cooling water distribution, the cooling water flow rate, and the cooling water temperature for different positions of the second cold press mold based on the cooling water distribution information, the cooling water flow rate information, and the cooling water temperature information comprises:

respectively controlling the on-off state of each cooling pipeline in the second cold stamping die based on the cooling water distribution information;

respectively controlling the flow rate of cooling water in each cooling pipeline in the second cold stamping die based on the flow rate information of the cooling water;

and respectively controlling the cooling water temperature in each cooling pipeline in the second cold stamping die based on the cooling water temperature information.

Technical Field

The invention relates to the technical field of manufacturing, in particular to a hot stamping method.

Background

The hot stamping process has been used for producing automobile parts, but the parts are mainly used in beam parts, and the performance of the stamped parts cannot be obviously divided, and the strength of different parts of the parts is basically the same. In actual application, different parts of the part are often required to have different strengths, so that the collision resistance and the energy absorption performance of the part can be improved.

Therefore, a new hot stamping method is needed to make the strength of different parts of the manufactured part different.

Disclosure of Invention

The embodiment of the application provides a hot stamping method, so that the technical problems that in the hot stamping method in the prior art, the performance of a stamped part cannot be obviously partitioned, and the strengths of different parts of the part are basically the same are solved, the performance of the stamped part is obviously partitioned, and the strengths of different parts of the part are obviously different, so that the technical effects of the collision resistance and the energy absorption performance of the part are improved.

The application provides the following technical scheme through an embodiment of the application:

a hot stamping method, comprising:

carrying out simulation on a formed part to obtain the pre-stamping forming amount of a first cold stamping die and cooling water distribution information, cooling water flow rate information and cooling water temperature information of different positions in a second cold stamping die;

controlling the first cold stamping die to perform pre-stamping on the plate material based on the pre-stamping forming amount to obtain a pre-stamped part;

placing the pre-stamped part in a heating furnace for heating and heat preservation, so that the pre-stamped part is completely austenitized, and an austenitized part is obtained;

transferring the austenitized part into a second cold stamping die for stamping and forming to obtain a stamped part;

cooling and quenching the part subjected to stamping forming through the second cold stamping die; wherein, when the cooling quenching is performed, the cooling water distribution, the cooling water flow rate, and the cooling water temperature at different positions of the second cold press die are controlled based on the cooling water distribution information, the cooling water flow rate information, and the cooling water temperature information, so that the cooling capacities at different positions in the second cold press die are different.

Preferably, the simulation of the formed part to obtain the pre-press forming amount of the first cold-press die includes:

acquiring shape information of the formed piece;

acquiring the mechanical property information of the plate, wherein the mechanical property information comprises the stress-strain relationship of the materials at different temperatures and the stress-strain relationship of the materials at different strain rates;

and inputting the shape information and the mechanical property information into simulation software to perform pre-stamping simulation, so as to obtain the pre-stamping forming amount.

Preferably, the performing simulation on the formed part to obtain cooling water distribution information, cooling water flow rate information, and cooling water temperature information at different positions in the second cold stamping die includes:

inputting the shape information and the mechanical property information into simulation software for collision simulation to obtain microstructure distribution information of different positions of the formed part;

and obtaining cooling water distribution information, cooling water flow rate information and cooling water temperature information of different positions in the second cold stamping die based on the microstructure distribution information.

Preferably, before the pre-stamping the sheet material by controlling the first cold stamping die based on the pre-stamping forming amount, the method further includes:

cutting the plate;

and placing the cut plate in the first cold stamping die.

Preferably, the temperature of the heating and heat preservation is more than 830 ℃.

Preferably, a plurality of cooling pipes are provided in the second cold stamping die, the plurality of cooling pipes are located at different positions, an opening and closing state of each cooling pipe may be individually controlled, a flow rate of cooling water in each cooling pipe may be individually controlled, and a temperature of cooling water in each cooling pipe may be individually controlled.

Preferably, the controlling of the cooling water distribution, the cooling water flow rate, and the cooling water temperature at different positions of the second cold press mold based on the cooling water distribution information, the cooling water flow rate information, and the cooling water temperature information includes:

respectively controlling the on-off state of each cooling pipeline in the second cold stamping die based on the cooling water distribution information;

respectively controlling the cooling water flow rate in each cooling pipeline in the second cold stamping die based on the cooling water flow rate information;

and respectively controlling the cooling water temperature in each cooling pipeline in the second cold stamping die based on the cooling water temperature information.

One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

in an embodiment of the present application, a hot stamping method is disclosed, including: carrying out simulation on a formed part to obtain the pre-stamping forming amount of a first cold stamping die and cooling water distribution information, cooling water flow rate information and cooling water temperature information of different positions in a second cold stamping die; controlling the first cold stamping die to perform pre-stamping on the plate material based on the pre-stamping forming amount to obtain a pre-stamped part; placing the pre-stamped part in a heating furnace for heating and heat preservation, so that the pre-stamped part is completely austenitized, and an austenitized part is obtained; transferring the austenitized part into a second cold stamping die for stamping and forming to obtain a stamped part; cooling and quenching the part subjected to stamping forming through the second cold stamping die; wherein, when the cooling quenching is performed, the cooling water distribution, the cooling water flow rate, and the cooling water temperature at different positions of the second cold press die are controlled based on the cooling water distribution information, the cooling water flow rate information, and the cooling water temperature information, so that the cooling capacities at different positions in the second cold press die are different. Therefore, the performance of the stamped part is obviously partitioned, and the strength of different parts of the part is obviously different, so that the technical effects of the collision resistance and the energy absorption performance of the part are improved. Therefore, the technical problems that the performance of the stamped part cannot be obviously partitioned and the strength of different parts of the part is basically the same in the hot stamping method in the prior art are solved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

Fig. 1 is a flowchart of a hot stamping method according to an embodiment of the present application.

Detailed Description

The embodiment of the application provides a hot stamping method, so that the technical problems that in the hot stamping method in the prior art, the performance of a stamped part cannot be obviously partitioned, and the strengths of different parts of the part are basically the same are solved, the performance of the stamped part is obviously partitioned, and the strengths of different parts of the part are obviously different, so that the technical effects of the collision resistance and the energy absorption performance of the part are improved.

In order to solve the technical problems, the general idea of the embodiment of the application is as follows:

a hot stamping method, comprising: carrying out simulation on a formed part to obtain the pre-stamping forming amount of a first cold stamping die and cooling water distribution information, cooling water flow rate information and cooling water temperature information of different positions in a second cold stamping die; controlling the first cold stamping die to perform pre-stamping on the plate material based on the pre-stamping forming amount to obtain a pre-stamped part; placing the pre-stamped part in a heating furnace for heating and heat preservation, so that the pre-stamped part is completely austenitized, and an austenitized part is obtained; transferring the austenitized part into a second cold stamping die for stamping and forming to obtain a stamped part; cooling and quenching the part subjected to stamping forming through the second cold stamping die; wherein, when the cooling quenching is performed, the cooling water distribution, the cooling water flow rate, and the cooling water temperature at different positions of the second cold press die are controlled based on the cooling water distribution information, the cooling water flow rate information, and the cooling water temperature information, so that the cooling capacities at different positions in the second cold press die are different. Therefore, the performance of the stamped part is obviously partitioned, and the strength of different parts of the part is obviously different, so that the technical effects of the collision resistance and the energy absorption performance of the part are improved. Therefore, the technical problems that the performance of the stamped part cannot be obviously partitioned and the strength of different parts of the part is basically the same in the hot stamping method in the prior art are solved.

In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.

First, it is stated that the term "and/or" appearing herein is merely one type of associative relationship that describes an associated object, meaning that three types of relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.