CN114619211A

CN114619211A - Thermal forming processing technology for front pillar plate

Info

Publication number: CN114619211A
Application number: CN202210306074.2A
Authority: CN
Inventors: 李守刚; 耿涛
Original assignee: Tianjin Hengxing Mechanical Equipment Co ltd
Current assignee: Tianjin Hengxing Mechanical Equipment Co ltd
Priority date: 2022-03-25
Filing date: 2022-03-25
Publication date: 2022-06-14

Abstract

The invention relates to a hot forming process for a front column plate, which belongs to the field of hot forming. The feeding and discharging mechanical arm is used for taking the plate from the plate stack to mark, and then the plate which reaches the standard is placed in the heating furnace to be heated by the feeding and discharging mechanical arm. And taking the plate with the austenite heating temperature out of the heating furnace by using a feeding and discharging manipulator, then putting the plate into a die, performing punch forming by using a press, and performing quenching hardening. The formed parts are taken down from the die by utilizing the feeding and discharging manipulator, the steel plate with the temperature added to the austenite temperature is placed into the die to be rapidly formed through stamping, and once the depth reaches a preset position during forming, the parts are only quenched so that the hardening strength of the parts is improved.

Description

Thermal forming processing technology for front pillar plate

Technical Field

The invention belongs to the field of thermoforming, and particularly relates to a thermoforming processing technology for a front pillar plate.

Background

In the existing life, the automobile is visible everywhere, the automobile can be roughly divided into three blocks, namely an engine, a gearbox and an automobile body, the automobile body is divided into a chassis and a framework, the framework comprises a front column, a middle column and a rear column, the upright column plays a role of a door frame besides a supporting role, and the safety performance of the automobile becomes one of important factors considered when a consumer buys the automobile. And counting and finding that the front collision accident is the traffic accident type with the highest occurrence ratio. When frontal collision occurs, the deformation of a vehicle door area needs to be controlled besides ensuring that drivers and passengers have enough living space, so that the vehicle door can be normally opened after an accident occurs, and passengers can be ensured to withdraw from the vehicle in time.

The existing front column forming method mainly comprises welding and direct forming, the strength of the welded front column at a welding point can be influenced, so that subsequent safety problems can exist, the direct forming is not obtained through direct stamping, the integral integrity of the direct stamping forming is guaranteed, and the strength of the direct stamping forming subjected to special treatment is different from that of the direct stamping forming subjected to special treatment.

Disclosure of Invention

The invention aims to provide a vehicle front pillar plate hot forming processing technology, which has the advantages that a hot forming steel plate does not need to be preformed after blanking, the steel plate is directly heated, then the steel plate with the temperature added to the austenite temperature is placed into a die to be rapidly formed through stamping, only parts are quenched once the depth reaches a preset position during forming, so that the parts are hardened, the strength is improved, redundant parts around the parts in a row are removed through laser cutting, and the like.

In order to achieve the purpose, the specific technical scheme of the hot forming processing technology for the front pillar plate is as follows:

a thermoforming processing technology for a front pillar plate comprises the following steps:

firstly, uncoiling and leveling a common high-strength steel plate coil with the tensile strength of 980-1380Mpa, then blanking the leveled steel plate by using a progressive die press machine, and stacking;

secondly, taking a plate from the plate stack by using a feeding and discharging mechanical arm to mark, and then placing the marked plate in a heating furnace by using the feeding and discharging mechanical arm to heat;

thirdly, taking the plate with the austenite heating temperature out of the heating furnace by using a feeding and discharging manipulator, then putting the plate into a die, performing punch forming through a press, and performing quenching hardening;

fourthly, taking the molded part down from the mold by using a feeding and discharging mechanical arm, and cutting redundant parts of the part by using a laser cutting machine;

and fifthly, putting the cut part on a shot blasting line by using a feeding and discharging mechanical arm to perform shot blasting and oil coating on the surface of the part.

Further, the blanking in the step (1) is to cut the coiled steel plate into a plate with a size slightly larger than that of the part.

Further, the sheets are laid together to form a stack.

Further, the temperature of the heated plate in the step (2) is over 950 ℃.

Further, the plate with the temperature exceeding 950 ℃ is austenite.

Further, the press in the step (3) is a 1200-ton servo press or an oil press.

And (3) when the 1200-ton servo press or oil press drives the die to move and the moving depth reaches a preset position, maintaining pressure and cooling, and immediately quenching and hardening the formed part.

Further, the structure after the quench hardening is martensite.

Further, the strength of the ultra-high strength part composed of martensite is about 1500 MPa.

Further, the hardness after quenching is different depending on the quenching method.

The invention has the advantages that:

the hot forming steel plate does not need to be preformed after blanking, the steel plate is directly heated, then the steel plate with the temperature added to the austenite temperature is placed into a die to be rapidly formed through stamping, only parts are quenched once the depth reaches a preset position during forming, so that the parts are hardened and the strength is improved, and redundant parts around the parts in rows are removed through laser cutting.

Drawings

FIG. 1 is a process flow diagram of the present invention

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

A process for thermoforming a front pillar panel is illustrated with reference to fig. 1, the process comprising the steps of:

firstly, uncoiling and leveling a common high-strength steel plate coil with the tensile strength of 980-1380Mpa, blanking the leveled steel plate by using a progressive die press machine, and stacking the steel plate, wherein the blanking is divided into a plurality of small steel plates, so that the grabbing and subsequent forming are facilitated;

secondly, taking a plate from the plate stack by using a feeding and discharging mechanical arm to mark, and then placing the marked plate in a heating furnace by using the feeding and discharging mechanical arm to heat, so that the steel is heated to a proper temperature;

thirdly, taking the plate with the austenite heating temperature out of the heating furnace by using a feeding and discharging manipulator, then putting the plate into a die, performing punch forming through a press, quenching and hardening to increase the hardness of the frame steel;

Referring to fig. 1, the blanking is to cut the coiled steel plate into a plate with a size slightly larger than that of the part.

The sheets are laid together to form a stack, as illustrated in figure 1.

As illustrated with reference to fig. 1, the temperature of the heated sheet exceeded 950 ℃.

As illustrated with reference to fig. 1, the sheet material at temperatures above 950 c is austenitic.

The press is illustrated in fig. 1 as a 1200 ton servo press or oil press.

Referring to fig. 1, when the 1200 ton servo press or hydraulic press drives the mold to move, and the moving depth reaches a predetermined position, the mold is subjected to pressure maintaining cooling, and the molded part is immediately quenched and hardened.

Referring to fig. 1, the structure after quench hardening is martensite.

Referring to fig. 1, the strength of the ultra-high strength martensitic part is about 1500 MPa.

As described with reference to fig. 1, the hardness after quenching is different depending on the quenching method.

The working principle is as follows:

when a front column plate of a vehicle is formed, a multi-purpose plate coil needs to be leveled to avoid the influence of pits on the plate coil on the formed appearance, then a progressive die press is used for blanking the leveled steel pipe to separate the steel pipe into plate blocks with the same size, the plate blocks are stacked together to form a plate stack to facilitate the transfer of the plate, then a feeding and discharging mechanical arm is used for grabbing the blanked plate from the stack, marking is firstly carried out, the plate is placed into a heating furnace to be heated after marking, the temperature is higher than 950 ℃, the plate reaches the austenite temperature, then the plate reaching the austenite temperature is transferred into a die, the die is punched by a 1200-ton servo press or an oil press, after the part punched by the die reaches a fixed position, the part punched by the die is quenched by the current common method, the initial tensile strength of No. 45 steel is 460MPa, the tensile strength of the material after quenching at room temperature is 1168MPa, the strength is remarkably improved, the quenching time is relatively longer, the production period of the part is longer, the strength after quenching in water and in oil is 1525 and 1653MPa respectively, the strength is slightly higher than that at room temperature, the strength difference after quenching in the two modes is not very large, water is safer and more stable relative to oil, water is the best choice, then the three conditions of 40Cr are analyzed, 560MPa is initially obtained, 1213, 1610 and 1724 are sequentially obtained after quenching, and direct hot forming is carried out on the material for workpieces with simpler shapes and less deformation degrees due to the price of 40Cr, so that the processing cost is very wide.

It is to be understood that the present invention has been described with respect to one side embodiment, and that various changes, substitutions of equivalents and changes in the features and embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims

1. A hot forming processing technology for a front pillar plate is characterized by comprising the following steps:

(1) uncoiling and leveling a common high-strength steel plate coil with the tensile strength of 980-1380Mpa,

then, a progressive die press is used for blanking the leveled steel plates and stacking;

(2) taking a plate from the plate stack by using a feeding and discharging mechanical arm to mark, and then placing the marked plate in a heating furnace by using the feeding and discharging mechanical arm to heat;

(3) taking the plate with the austenite heating temperature out of the heating furnace by using a feeding and discharging manipulator, then putting the plate into a die, performing punch forming through a press, and performing quenching hardening;

(4) taking the molded part down from the mold by using a feeding and discharging mechanical arm, and cutting redundant parts of the part by using a laser cutting machine;

(5) and (4) placing the cut parts on a shot blasting line by using a feeding and discharging manipulator to perform shot blasting and oil coating on the surfaces of the parts.

2. The hot forming process for the front pillar panel of claim 1, wherein the blanking in step (1) is to cut the coiled steel plate into a plate with a size slightly larger than that of the part.

3. A process according to claim 2, wherein the sheets are laid together to form a stack.

4. The thermoforming process for manufacturing a vehicle front pillar panel as claimed in claim 1, wherein the temperature of the heated sheet in step (2) is greater than 950 ℃.

5. The hot forming process for a vehicle front pillar panel according to claim 4, wherein the sheet material having a temperature in excess of 950 ℃ is austenitic.

6. The thermoforming process for processing a front pillar panel as claimed in claim 1, wherein the press in step (3) is a 1200 ton servo press or an oil press.

7. The thermoforming processing technology for the front pillar plate of claim 6, wherein in the step (3), when the 1200 ton servo press or oil press drives the mold to move, and after the moving depth reaches a preset position, pressure maintaining cooling is performed, and the formed part is immediately quenched and hardened.

8. The hot forming process of a vehicle front pillar panel according to claim 7, wherein the structure after quench hardening is martensite.

9. The hot forming process for the front pillar panel of claim 8, wherein the martensite constitutes an ultra-high strength part with a strength of about 1500 MPa.

10. The hot forming process for a front pillar panel according to claim 1, wherein the quenching is performed in different manners, so that the hardness of the quenched front pillar panel is different.