Cold upsetting forming die of slender bolt

Abstract

The invention discloses a cold upsetting forming die of a slender bolt. The forming die comprises a female die, a dredging bar, a backrack big screw and a back movable connection rod; one end of the dredging bar is arranged in the cavity of the female die; the back part of the female die is provided with the backrack big screw; and the back movable connection rod is arranged at the center of the backrack big screw. The invention is characterized in that the back of the female die is also provided with a safety protection pipe; the safety protection pipe is sleeved on the other end of the dredging bar; and the central hole of the safety protection pipe is opposite to the cavity of the female die. As the safety protection pipe is arranged on the periphery of the dredging bar and the central hole of the safety protection pipe is opposite to the cavity of the female die, the length of the female die can be set to be shorter; as the external diameter of the dredging bar is increased and the dredging bar is supported, the dredging bar is difficult to bend or crack in the driving or retreating process and the work efficiency can not be influenced; and as a starting tringle is added on the front part of the back movable connection rod, the length of the back movable connection rod can be shortened, the weight can be lightened and the defect that the back movable connection rod is difficult to process can be overcome.

Description

technical field [0001] The invention relates to a cold heading forming die, in particular to a cold heading forming die for slender bolts, belonging to the technical field of precision machinery manufacturing. Background technique [0002] figure 1 It is a schematic diagram of the traditional slender bolt cold heading forming die. [0003] like figure 1 Shown: the slender bolt cold heading forming die includes: a female mold 1, a forming inter-module block 2 and a feed rod 3, wherein the forming inter-module block 2 is located at the rear of the female mold 1, and its central through hole is connected to the female mold 1 Cavity docking, feeding rod 3 is set in the cavity of the mother mold 1 and the through hole of the forming module block 2, and the rear part of the feeding rod 3 is also provided with a bolt passing mechanism, which includes a large back screw 4. The rear moving connecting rod 5 and the power source, etc. The rear moving connecting rod 5 is located at t...

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Problems solved by technology

[0003] like figure 1 Shown: the slender bolt cold heading forming die includes: a female mold 1, a forming inter-module block 2 and a feed rod 3, wherein the forming inter-module block 2 is located at the rear of the female mold 1, and its central through hole is connected to the female mold 1 Cavity docking, feeding rod 3 is set in the cavity of the mother mold 1 and the through hole of the forming module block 2, and the rear part of the feeding rod 3 is also provided with a bolt passing mechanism, which includes a large back screw 4. The rear moving connecting rod 5 and the power source, etc. The rear moving connecting rod 5 is located at the center of the rear supporting large screw 4, and it is driven by the power source. The elongated bolt cold heading forming mold with this structure has a long mother mold 1, The feed rod 3 does not have any support. When the diameter of the bolt 0 exceeds 300mm, the feed rod 3 will easily bend and break when it is working, so that the material cannot be returned. Rod 5 also needs to be designed to be very long and heavy, which is not easy to process

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