Forging of square heads with extra long T-bolts
-250 air hammer forged square head of 400~550mm T-shaped bolt, once fired. :Simple mold; extra long bolt; forged 0刖目Hangzhou Steel Equipment Manufacturing Branch, a workshop, undertakes the task of processing and manufacturing second-class and partial-type spare parts for each branch of the group company. Last year, it received a batch of 400500mm long T Due to the large number of machining instructions for the bolts, if free forging is used, it takes time and labor. On the basis of fully considering the existing equipment and technology, we have partially modified the C41-250 air hammer and designed and manufactured a number of simple molds, which have achieved good results. This article takes the guide bolts (see) of Hangzhou Iron and Steel Co., Ltd. as an example. Hangzhou Iron and Steel Co., Ltd. Guide plate fixing bolt parts equipment modification, mold design and bolt making 1.1 Equipment modification To forge extra long bolts, the existing C41-250 air hammer in our workshop has insufficient working stroke, so it has been modified to remove the lower anvil. Block, re-create a new anvil pad and replace the original anvil pad. The distance between the plane (440mmX 440mm) on the new anvil pad to the upper plane of the station is 50mm, so that the distance from the lower cover of the working cylinder to the new anvil surface is 665mm. 1.2 Making a simple forging die as shown, the simple forging die is divided into upper and lower modules. In part, the inner cavity of the upper die (wrought 45 steel) is quenched, and the groove is cut in the seamless steel pipe of the lower die to remove the workpiece along the anvil surface. The core block is set to prevent the workpiece from tilting and upsetting in the seamless steel pipe. Offset the centerline. The total height of the forging die is 526-528, which can make the square head evenly bear the hammering force on the surface of the outer diameter of 35 and the inner diameter of 30mm. The square head is thickened at the moment when the workpiece sinks slightly to contact the anvil surface, thereby avoiding hammering. Time 1.3 Bolt production process Local heating 35 end part, die forging thickened heating part on C41-250 air hammer, then forging with square head (36-〗mmX56mm) with C41-150 air hammer, and finally air in C41-25Q Hammer upper forging flattened upper end face - processed according to requirements. The air hammer is replaced during forging to form the assembly line. 2 effect significantly improves the forging efficiency. Using the existing equipment and technology of the workshop, in the same case, taking the fixing bolts of the middle rolling mill guide as an example, 50~80 pieces are forged by free forging every day; and the process is used to reduce the processing cost and shorten the processing cycle every day. For example, in the middle rolling mill guide plate fixing bolts, free forging is used, the weight of the forging weight of each bolt is 6.4kg, and the die forging is only 4.6kg. According to 6000 pieces per year, a total of 10.8t of material can be saved, and correspondingly The amount of turning is reduced, and there is no need for the finished fitter to find the center hole of the two drilled lines. The mold consumption is low. After statistics, the upper die is replaced once for 3000 4000 pieces, and the lower die can be replaced for 3~4 years or even longer. -0524 Review: Li Xingyuan Editor: Wu Gentu (Continued from page 24) Elevator Modernization,Elevator Modernisation,Elevator Modification,Lift Modernization Suzhou Stable Trade Co., Ltd , https://www.stable-elevator.com