Stamping modern production technology
First of all,Light weight body technology
Data show that every 1% reduction in vehicle quality, fuel consumption declines
0.6%~1.0%; steel plate accounts for about 75% of car materials, and the body quality is about
25% to 30% of the car's quality, as the price of oil rises, the body weight will become
For the goal pursued by many manufacturers, the technology that promotes lightweight body will be
To the rapid development of the rapid development.
1. Application of laser tailor welded blank technology
Laser tailor welded blanks are steel pieces of different materials, different thicknesses and different coatings.
Welded into a single piece to meet the different requirements of the material properties of the parts.
The advantages of this process are:
(1) Reduce the quality of structural parts to achieve lightweight body;
(2) reduce the number of structural parts;
In addition, the first domestic production of laser panels, ThyssenKrupp in Wuhan
Li, FAW Baoyou Company is currently the largest laser tailored blank processing enterprise in China.
Technical advantages of laser tailor welded blanks
Reduce the number of workpieces, thereby reducing processing and reducing production costs
Reduce the weight of the workpiece, thus reducing the weight of the vehicle
Improve workpiece quality (reduce cumulative tolerances)
Improve body crash safety
2. Application of high strength steel plate
As oil prices rise and people's demand for safety increases, thinning increases
It is the development trend of steel sheets for automobiles. Therefore, high-strength steel sheets will get more
Plus universal application. The data show that in the early 1980s, the United States, Japan and other countries began to
High-strength steel plates are used for the production of bodywork;
High-strength steel plate can reduce the quality of parts and improve the collision of the whole vehicle
Fullness, improve the appearance quality and anti-concavity of the parts.
Forming characteristics of high-strength steel sheets:
High tensile strength, forming force increases with increasing tensile strength;
The increase in carbon content and alloying elements reduces the forming properties of the material;
High tensile strength and corresponding rebound increase;
When deep drawing, high forming force and deformation will increase the possibility of wrinkling;
High material shear strength and increased shear force.
3. Hot stamping forming technology
Sheet thermoforming is to heat the billet to a temperature above the recrystallization temperature.
Temperature, when the sheet is formed in the austenite state, reducing the sheet forming time
The flow stress increases the formability of the sheet.
The advantages of this process are: optimizing part integration and reducing the number of parts
The amount has a very significant weight loss effect.
Secondly, New technology for stamping equipment
The modern automobile industry has a large-scale production, small batch size, and variety changes.
Quick and multi-model collinear production; at the same time, the body cover is large
The characteristics of integration and integration, thus requiring the punching equipment to be flexible and automated
And the direction of high efficiency.
Third, mold surface strengthening technology - TD surface coating treatment technology
1. Overview of TD surface coating treatment technology
TD surface coating treatment technology is short for Thermal Diffusion Coating Process.
Developed in 1972 by the Toyota Central Research Institute of Japan.
In 1973, Japan's TOYOTA and other American auto companies began to apply this technology to automotive molds.
TD surface coating treatment technology is a general term for surface hardening treatment by molten salt immersion plating, electrolysis and powder method (someone in China: molten metal plating). The principle is: The workpiece is placed in a mixture of borax (or other) molten salt, and a layer of metal carbide coating of several micrometers to several tens of micrometers is formed on the surface of the workpiece by high temperature thermal diffusion. At present, the most widely used at home and abroad is vanadium carbide (VC) coating. Due to the high hardness (HV=2800～3200) and tighter structure of these carbides, the performance of TD-treated automotive molds has been greatly improved. Extremely high wear resistance, seizure resistance (strain), corrosion resistance; according to statistics: More than 85% of the molds produced in large quantities in Japan are processed by TD.
2. Process flow of TD surface coating treatment technology
Appearance and size inspection (with or without defects in appearance, measuring the size of the insert for easy lifting) → Grinding, polishing (polishing defects, polishing when special) → Degreasing and loading (removing the surface grease of the workpiece, loading the workpiece onto the workpiece holder) →Part preheating (changing the matrix structure and reducing the deformation of the workpiece)→TD coating treatment (treatment temperature 850 °C - 1100 °C, using borax salt bath) → quenching (improving the mechanical properties of the matrix, obtaining the necessary hardness) → back Fire (eliminate the stress of the workpiece) → clean (wash) (remove the borax salt on the surface of the workpiece) → polish (removal of oxides and adherends on the surface of the workpiece) → inspection.
3, the advantages of TD processing technology
(1) The surface of the automobile mold after TD treatment has high hardness and low friction coefficient;
(2) The coating treated by TD is metallurgical bonding and has excellent anti-seizure and anti-strain properties;
(3) The life of automobile molds after TD treatment is increased several times, even dozens of times;
(4) The corrosion resistance and oxidation resistance of automobile molds after TD treatment are also greatly improved;