Views: 146 Author: Site Editor Publish Time: 2023-10-08 Origin: Site
With the rapid development of Chinese automobile industry, the market demand for ultra-thick and ultra-long metal sheets is increasing. Among them, the cutting and blanking method is fast and highly accurate, and it is more and more popular among users. During the feeding process of the CNC front feed shearing machine, most of the hydraulic (pneumatic) clamp clamping methods are used at present. However, when there is warpage in the length direction of the sheet, it does not have a floating function, which will cause errors in the process of aligning and feeding the clamp and affect the accuracy. In addition, the clamp structure is complicated, the cost is high, and the installation space is large. In view of the above problems, this article introduces a hydraulic floating clamp, which realizes that the clamp floats up and down when the surface of the sheet is warped unevenly, and is automatically aligned and reliably clamped.
(1) Clamp structure composition
Figure 1 is a schematic diagram of the clamp structure. The guide rail sub-slider 8 is fixed to the feed beam 1 with screws 9, the linear guide 4 is connected to the clamp seat 6 with screws 5, and the adjustment screw 2 and the lock are installed on the upper part of the clamp seat. Nut 3, the end of the adjusting screw is on the feeding block 25 of the feeding beam, and the lock nut can be locked after the height position of the clamp seat is determined. The jaw pads 10 and 12 are installed at the lower part of the jaw base, and are fixed with screws 11 and 13, respectively. The surface of the jaw pad is quenched, and the thickness of the jaw pad 10 has a grinding allowance.
An oil cylinder body 17 is installed at the front of the clamp base, and the two are fixedly connected by screws 7. The oil inlet of the lower cavity of the clamp base is in communication with the oil port of the cylinder body. An O-ring 24 is installed at the end of the oil port, which serves as a static seal protection for the lower cavity; the cylinder head 23 is installed on the cylinder body through the screw 22, and the oil inlet of the upper cavity is processed on the cylinder head, and the O-ring 21 is used as the upper cavity Static seal protection. A piston 18 is installed inside the cylinder body, which divides the cylinder body into upper and lower chambers. The piston head is equipped with an upper guide ring 19 and a combined seal ring 20 for two-way dynamic sealing protection. The piston rod is equipped with a lower guide ring 15 and a U shape the sealing ring 16 plays the role of one-way dynamic seal protection.
1. Feeding beam 2. Adjusting screw 3. Locking nut 4. Linear guide 5, 7, 9, 11, 13, 22. Screw 6. Clamp seat 8. Guide pair slider 10, 12. Jaw pad 14. Sheet material 15. Lower guide ring 16. U-shaped seal ring 17. Oil cylinder body 18. Piston 19. Upper guide ring 20. Combined seal ring 21, 24. O-shaped seal ring 23. Oil cylinder cover 25. Patch block
Figure 1-Schematic diagram of the clamp structure
As shown in Figure 2, there are several sets of the same clamps installed on the feed beam in actual use. The distribution of clamps meets the requirements of the length of the clamped plates. Each plate should ensure that at least two clamps work. With reference to FIG. 1, the thickness dimension of each group of clamps is ensured to be coplanar by grinding the thickness to play a positioning role.
Figure 2-Clamp layout
(1) Working process when the surface of the sheet is flat
As shown in Fig. 3, adjust the upper surface of the jaw pad 12 to be lower than the lower surface h1 of the sheet material (generally recommended to be 5 to 10 mm) by adjusting the screws, and then tighten the lock nut. The feeding beam moves forward, and the jaw pad 10 on the clamp is close to the side of the sheet to realize the positioning of the sheet. The oil inlet of the upper cavity, the piston presses down the plate, the clamp seat floats up h1, the plate is clamped, and the h1 gap also appears between the end of the adjustment screw and the feed block of the feed beam; the oil inlet of the lower cavity enters With oil, the piston returns upward, releases the sheet, and the clamp seat descends by h1, and the end of the adjustment screw is pressed against the feed block of the feed beam. Due to the flatness of the sheet, the floating rise of each group of clamps is the same.
Figure 3-Clamp working diagram
(2) Working process when the surface of the sheet is warped
If the surface warpage of sheet 14 is h2 (that is, the difference between the highest point and the lowest point of the sheet surface), adjust the upper surface of each group of clamp jaw pads 12 to be lower than the lower surface h1 of the lowest end of the sheet. The action process of clamping and loosening is as mentioned above, but with the amount of warpage of the sheet, the floating amount of each group of clamps is different, the value is h1～h1+h2, but it can float up and down, and it is automatically corrected to ensure Each group of clamps the sheet reliably.
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