FAW Car Co., Ltd. Shao Qiming
With the civilianization of the automobile industry, more and more automobile brands have begun to enter the market, and consumers are paying more and more attention to the cost performance of automobiles. This requires the automotive industry to constantly pursue lowering costs. Increasing the production cycle of the production line is an important way to reduce costs in the stamping industry. Therefore, more and more high-speed production lines and multi-station presses have appeared in various stamping workshops in China. The multi-station production line can increase production tempo by reducing the effective transmission distance to maximize production efficiency.
Multi-station production line features
As with the large-scale stamping production line, the multi-station production line has all the automation equipments such as loading, unwinding, centering, transmission and lower parts, which can realize the automatic production process after loading. Figure 1 shows the side view of the multi-station press line.
Figure 1 Multi-station press line side view
Different from the multiple presses of the large press production line, the multi-station production line uses only one press, and the multi-step press and transfer in a single press is realized by installing the progressive die.
Multi-station production parts features
(1) Due to the current multi-station transmission, the clamp or the shovel is used for transmission. The clamping and holding position will be squeezed or rubbed against the surface of the stamping part, which will affect the surface state of the contact surface on the stamping part. In the high-speed production process, the effect will be expanded. Figure 2 shows the multi-station transmission clamp picture.
figure 2
(2) The flat parts on both sides are more easily transported due to the transmission mode, and the flat stamping parts on both sides are easier to transfer. If the edge of the stamping part has a larger angle with the horizontal line, the transport tooling needs to be specially designed according to the specific shape of the stamping part. Such as special angle clamps, pneumatic magnets, etc., Figure 3 is a special large opening and closing transmission clamp, when using special tooling, it takes a long time to debug, and has a certain impact on the production cycle.
image 3
(3) Small and medium-sized stamping parts Generally speaking, the complexity of stamping parts is often proportional to the size, that is, the stamping parts of larger sizes often require more stamping processes to achieve, so when the stamping parts of larger size are used When the mold is designed in the form of progressive die, it often goes far beyond the work surface of the multi-station and cannot be installed.
Optimization of multi-station transmission beats
(1) Increasing the number of processes In the mold design stage, it is necessary to increase the number of mold processes as much as possible. The common method can increase the number of processes by increasing the empty station mode. Figure 4 is a common process plan for multi-station molds. When the number of processes is increased, the transmission distance is reduced accordingly, and the transmission time is reduced at the same acceleration, thereby maximizing the production cycle.
Figure 4
(2) In the optimized transmission process of the transmission curve, the transmission time can be shortened by optimizing the transmission curve from a right angle to a rounded corner. If the transfer arm starts to rise later, the transfer arm will be lowered in advance when the advancement is in place. Figure 5 shows the optimized multi-station transmission curve.
Figure 5
Prospects for multi-station development
With the improvement of equipment manufacturing level, the multi-station tonnage and table size will gradually increase, and the tooling with multi-station transmission will be more and more abundant. More and more stamping parts such as large stamping parts and outer surface parts will be Production in a multi-station production line.
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