26/03/2025 – New “All-in-One” machine produces up to M 20 bolts directly from the coiled wire
Cold and hot forming of bolts and screws
With the new “BM 12” bolt-making machine, Amba increases the range of products covered by its “All-in-One” series of machines to include wire gages of up to 18mm (~ 0.7“) diameter. It is the most powerful of all machines ever built by Amba and, due to the high upsetting forces involved, the first to use inductive heating for the forming of the bolt head.
Fig. 1: Due to the high forming forces required, the bolt heads are inductively pre-heated before the upsetting process. © Amba
Fig. 1: Due to the high forming forces required, the bolt heads are inductively pre-heated before the upsetting process. © Amba
Fig. 2: At the first upsetting stage, the material is compressed into a preformed head. © Amba
Fig. 3: At the induction stage, the heads of the bolt blanks are heated to more than 1,000°C (~ 1,850°F). © Amba
Fig. 4: After the second forming stage, the bolts are turned over. © Amba
Fig. 5: A finished bolt head that has gone through the two-stage forming process. © Amba
Fig. 6: After rolling of the thread, the finished bolts are discharged from the machine via a belt conveyor. © Amba
Fig. 7: The BM 12 machine ready to be shipped to the customer. © Amba
Fig. 8: The BM 12 machine ready to be shipped to the customer © Amba