Due to the thermal stress caused by the temperature difference on the cross section of the die body, the forging die will suddenly break during work, especially the complicated forging die with a deep inner die cavity, which is more dangerous due to uneven preheating temperature. . Under the premise of ensuring the production of qualified forgings, the minimum number of die forging steps should be used. Although more appropriate forging steps can make the billet more accurate and the metal distribution is more reasonable, the disadvantage is that if there are more steps, the time will be longer, the metal temperature will decrease, the fluidity will decrease, and the number of blows will increase. Reduce forging die life. The working rhythm of the forging die is the beat of the forging die, which not only affects the productivity of the forging, but also affects the life of the forging die. Each type of forging die has its best forging rhythm.

At this time, the service life is the highest. If the working rhythm of the forging die is too slow, the cavity surface temperature is too low, and the forging die undergoes repeated thermal cycles in the case of large temperature differences. Reduced fatigue life. If the production rhythm of the forging die is too fast, the surface of the cavity is overheated, and the mechanical properties of the forging die will be reduced prematurely at this time. Therefore, any inconsistency with the production of forging dies, such as the inconsistency of the front and back processes, frequent failures, and blind pursuit of productivity, will not only affect the normal progress of forging production, but also reduce the life of the mold. Only in continuous production to ensure that the forging die works under neither cold nor hot conditions, the life of the forging die can reach the optimal value. Forging die repair Forging die repair can greatly improve the forging die life, and the repaired forging die life can be increased by 1.52 times. The repair effect of the forging die depends on the repairing process, time, and number of times. After the new forging die is put into use, after a certain number of forgings are completed, it should be repaired compulsively even if it is not damaged. Value, it is difficult to get the best results for the first repair too early or too late. The structure of the forging die is different and the first repair is different. It can be determined after analysis and comparison based on the experience accumulated in production practice. The forging die can be repaired multiple times. The more times it is repaired, the higher the life. However, because the forging die repair process is more complicated and requires a certain amount of money, it is necessary to grasp the reasonable number of repairs of various forging dies during the production process. Concluding remarks There are many factors that affect the life of forging dies. To improve the life of forging dies, we must first rationally select the parting surface, die slope, fillet radius, and flash groove during design. At the same time, we must carefully manufacture and use them correctly.

And maintenance. In order to obtain excellent impact toughness and fatigue resistance, it is also important to choose the mold material and use the best heat treatment process. By discussing the design and use of forging dies for tooth picks and sockets, the life of forging dies has been significantly improved. For example, the number of forging dies for picks has increased from more than 3,000 pieces per pair to more than 8,000 pieces, up to about 10,000 pieces, which greatly reduces The cost of forgings is increased, and the economic benefits are improved. Design scheme The mold is designed as 1 mold and 2 cavities, and the oblique guide column is cored. Considering the manufacturing process and reasonable parting, the lock core is divided into 3 parts along the vertical direction of the axis as the parting surface, the head of the lock core in between, and the core pulling part in between. Because the part J has a side recess, the gate is set here, and the side recess can be milled when the gate trace is removed, eliminating a core pulling. The grid on the lock core and the cavity of the cross section of the key and the undercut of the tail of the lock core are formed by pulling the left and right sliders. Whether the structure is reasonable or not is the key to the success of the mold design. The arc surface of the sliding plate is processed by electric spark after the slider assembly is assembled. The arc surface is a part of a 12mm cylindrical surface. The radius is intentionally made copper elbow smaller by 0.1mm to form a void and is conducive to the lock cylinder. It can rotate freely on the lock body, which meets the technical requirements of parts.