200L steel barrel injection port and venting ring screw locking process and mold improvement
Qingjiang Metal Container Factory
In the past, the locking process of the top inlet and the vent coil of the 200-liter small-open steel drum of our factory was as follows: first punching the flange and pressing out the octagonal pocket (as shown in Figure 1-a), then Perform a spiral lock. During the locking process, the octagonal flange of the coil often appears to be misaligned with the octagonal pocket of the top of the barrel formed in the previous process. When the airtight test is performed after the lock is installed, the leak rate of the sealer is high. The reason for the leakage is that the relative position of the coil and the top of the barrel is determined by visual observation, and it is difficult to ensure the accuracy of the positioning.
Figure 1 Shape after punching and flanging
a. Before improvement b. After improvement
To this end, we have made appropriate improvements in the mold structure. In the process of punching and burring (as shown in Figure 1-b), the process of first pressing the octagonal pocket and then locking the coil is cancelled, and the new process in the production process has obtained satisfactory results. The specific process is introduced as follows:
After the top of the barrel is formed, the shape shown in Figure 1-b is punched on the top of the barrel by the punching and flanging die (the height and inner diameter of the through hole are the same as the corresponding size of the original process), and then the screw is locked by the mold. Locking and molding, and pressing the corresponding octagonal pocket on the top of the barrel to prevent the coil from rotating under the action of external torque. The characteristics of this process: lock and press the octagonal pocket once. The positioning of the octagonal flange of the coil at the same station and the pressing of the octagonal pocket of the barrel top are realized. In fact, the octagonal flange of the top of the bucket is punched out by the octagonal flange of the coil, thereby ensuring the accuracy of positioning. The current process not only improves production efficiency, but also controls the scrap rate.
The structure and working process of the punched edging octagonal cavity die and the improved locking die (compressed octagonal pocket) before the improvement are introduced.
The structure of the original punching and crimping octagonal concave cavity mold is shown in Fig. 2. The top of the bucket is positioned using a locating pin (not shown). Down the slider, the punching punch 2 first contacts the convex and concave die 4, and punches a small hole into the top of the bucket. The slider continues downward, and the workpiece 5 descends along with the die 3 and the discharge plate 6, and the small hole is turned into a straight wall hole by the action of the die 3 and the convex die. Finally, the outer octagonal shape of the male and female mold 4 and the inner octagonal shape of the female mold 3 press the barrel into the octagonal recess shown in Fig. Ia. The slider is advanced, and the unloading plate 6 causes the workpiece to move away from the male and female mold 4, and the workpiece is taken out, and one stroke ends.
Figure 2 venting mouth punching and crimping octagonal cavity mold
1-die shank; 2 one-hole punch; 3-die; 4-convex die; 5-1; 6-discharge plate; 7-spring; 8--die holder.
The improved lock mode structure is shown in Figure 3. First, the coil is placed on the positioning core 5, and the center is positioned, and the straight line segment of the waist hole in the middle of the unloading plate 6 is used for angular positioning. Downstream of the slider, the male die 4 first contacts the workpiece and descends with the discharge plate 6. As the slider continues to descend, the spring force is getting larger and larger. An octagonal pocket is formed at a corresponding position on the top of the bucket by the action of the octagonal flange of the coil and the profiled die 4. The upper part of the circumference of the coil (unthreaded part) is circled under the action of the locking die 2, the top of the barrel is hooked, the slider reaches the bottom dead center, and the locking of the coil and the forming of the octagonal pocket are completed. . Slider return, in the spring? The lowering plate 6 acts to eject the workpiece. Remove the workpiece and complete the lock work.
Figure 3 venting lock mold
1-die shank; 2-locking die; 3-fixing ring; 4-pressing die; 5-position die; 6-discharge plate; 7-spring; 8--die holder.
There are two points to note in mold manufacturing and production:
1. The torsion factor of the spring on the vent lock mold must be greater than the yaw coefficient of the lower mold spring. This structure is also suitable for the locking of the injection port coil.
2. During the production process, note that any diagonal of the spheroidal octagonal bulge cannot coincide with the diameter of the steel drum. The requirements are the same as those shown in GB325 “Packing Container Steel Barrelâ€, and the sealing device still has good sealing performance when the crimping is impacted. It is very important for sealing the barrel of the steel drum during transportation.
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