At present, the rapid development of body panel stamping technology is remarkable, mainly in the three aspects of the joining of hydraulic presses, the use of multi-station presses and the maturity of flexible technology.
Hydraulic machine joining
The mechanical press is the main body of the stamping production line, and no other equipment can shake its dominance for a long time. However, with the breakthrough of some key technologies of the hydraulic press, the advantages and potentials of the hydraulic press in the stamping are fully exerted, the productivity is obviously improved, and the problems of the synchronization of the stroke and the linkage with the conveyor are satisfactorily solved, and the trend of the hydraulic press as the main body of the press production line is generated. .
Of course, this does not mean that the hydraulic press will replace the mechanical press. Although the press line can all use hydraulic presses, it can also be used in combination with hydraulic presses and mechanical presses. However, the press line of mechanical presses as the mainframe is still the mainstream.
Multi-station press to get the pass
The stamping line, which was widely used in the early days, consisted of a double-acting mechanical press and several single-acting mechanical presses with a workpiece turning device between them. The emergence of multi-station sheet automatic presses is highly favored by the automotive industry due to its multi-step processing, compact structure and high production efficiency. The multi-station press is used as the main machine for the stamping production line, which is much more difficult than the single machine. It must solve a series of technical problems such as the drive system, the transmission system and the detection system. In recent years, with the above technical problems solved one by one, multi-station presses have become possible as a host into the press line.
Flexible technology is maturing
The flexible technology is becoming more mature and is the most important technological advancement in the production of car body panels. First of all, the numerical control of the equipment that forms the press line has laid the foundation for the automation of the press line. The flexible transfer technology, off-board simulation technology, off-line programming technology are improving day by day, especially the mold system including automatic mold storage, automatic mold recognition and extraction, automatic adjustment of mold working parameters, etc., marking the flexibility of the body cover The technology has matured, making “personalized†production of large-scale covers, order-based production and “just-in-time production†possible.
The introduction of the flexible stamping automatic line indicates that the development of flexible technology is gradually complete. The basic structure of the flexible stamping automatic line is still a double acting press and several single-action presses arranged in series. Before the double acting press, there is a demolition device, which is composed of a loading truck, a hydraulic jacking device, a magnetic layerer, a vacuum chuck lifter, a double material detector, a magnetic roller conveyor, a double material discharger, a cleaning oil coating device and a feeding device. Composition; there is a loading and unloading device between the double-acting press and the single-action press, including a hopper, a turning device, a conveying device and a feeder; a loading and unloading device between the single-action presses, by a hopper, conveying The device and the feeder are composed; the last single-action press is followed by a palletizing device consisting of a feeder, a conveyor and a pallet truck. In addition, automatic quick change systems, automatic quick adjustment systems, fault detection systems, and waste removal and transportation systems are essential. Due to the full application of robotics, microelectronics and hydraulics, not only the automation of the stamping process, but also the flexibility of the production organization is achieved. The large-scale multi-station press automatic stamping production line represents an advanced combination method and should be paid special attention. The continuous improvement of large-scale multi-station presses and the demand for the production of large-size car covers have promoted the development of automatic stamping production lines for large multi-station presses. The more primitive combination consists of a double-action stretching press and a single-action large-scale multi-station press, equipped with a set of turning devices and synchronizing devices, which improves the production cycle to a certain extent. And reduce the floor space.
The configuration of the second-generation production line is greatly simplified. A multi-station press with a double-action stretching station is equipped with a demolition device and a palletizing device in front and rear, respectively, to form an automatic stamping production line. Such multi-station presses are mostly four-column and three-slide structures. The first station under the first slide is a double-acting stretching station, and the boring station is a single-action punching station. Since the stretching station adopts the reverse stretching method, the workpiece is prevented from being turned over, so that the turning device is not required, and the productivity is further improved and the floor space is also reduced.
The emergence of large-scale multi-station presses with CNC hydraulic air cushions has abandoned the traditional double-action stretching process concept and truly combines stretching and other stamping processes onto a single press. The hardware composition of the automatic stamping production line is still a main unit equipped with a demolition device and a palletizing device. The main machine is a multi-station press with a numerical control hydraulic air cushion, and the numerical control hydraulic air cushion is the core of its technology. The CNC hydraulic air cushion is controlled by four corners to adjust the blanking force of the stretching work, thereby achieving single-action deep drawing. The use of digital hydraulic air cushion to replace the single-action press with a single-action press not only simplifies the structure of the press, eliminates the turning device, but also achieves optimal control of the blanking force, improves the quality of the tensile member, and reduces the workpiece. Rejection rate.
At present, China's forging machinery industry can not only provide the traditional configuration of stamping production line, semi-automatic press line and automatic press line, but also the ability to provide flexible stamping automatic line and large multi-station press automatic press line.
With the development of technology, many companies have or will transform the line of manual loading and unloading into semi-automatic press lines and automatic press lines, but there are still few companies using flexible press automatic lines. Due to the high cost and technical problems, the large-scale multi-station press automatic stamping production line will take time to promote it in China.
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