A Flash-free Forging Forming Process of Long Thick Arm Fork Joint and Its Back Extrusion Die

Abstract

The invention discloses a flash-less forging forming technology for a forked connector with a long and thick arm and a backward extrusion die for the flash-less forging forming technology. The technology comprises the following steps that a, firstly one end of a metal bar to be machined is heated, and after the forging temperature range is reached, a heating part is placed into a forward extrusiondie to be subjected to forward extrusion forming so as to obtain a handle rod part required by a forge piece; b, the part, except the formed handle rod part, of the metal bar obtained in the step a is heated, and after the forging temperature range is reached, the heating part is placed into an upsetting die to be subjected to upsetting forming so as to obtain a required square part; c, a formedblank obtained in the step b is subjected to concurrent heating, after the forging temperature range is reached, the formed blank is placed into the backward extrusion die to enable the square part obtained in the step b to be subjected to backward extrusion forming so as to obtain a forked part, and the forge piece is subjected to die stripping and cooling so as to obtain the required forge piece. The backward extrusion die is characterized in that the square contour in a guide concave die body is larger than the square contour in a lower forming concave die body, a guide groove is formed inthe guide concave die body, and a guide boss which is matched with the guide groove formed in the guide concave die body is arranged on the bulge part at the front side and the rear side of a punch.

Description

technical field [0001] The invention belongs to the field of pressure processing of metal parts, and in particular relates to a flash-free forging forming process of a long thick arm fork joint and a reverse extrusion die thereof. Background technique [0002] There are many varieties of fork-shaped forgings. Common forks include universal joint forks, connecting forks, flange forks, sliding forks, etc. For these forks, most of the forging industry in my country has adopted the open type of horizontal split die so far. Produced by the die forging process, the consumption of the flash metal varies with the complexity of the shape of the fork, and the high one can reach more than 30% of the forging's own weight, resulting in a low material utilization rate, which is accompanied by the heating power utilization rate. decrease. [0003] A long thick arm fork joint is used for the connection of some important parts of some special vehicles. The mechanical properties and quality re...

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