A Cold Extrusion Die for Changing the Position of Converging Marks of Metallographic Streamlines of Product

Abstract

The invention discloses a cold extruding die capable of changing a metallographic streamline mark collecting position of a product. The cold extruding die comprises an upper die (1) and a lower die (2). The upper die adopted by the cold extruding die is formed by an upper die plate, a movable pressing plate, an upper puncher pin, springs, an upper sliding block and an upper air cylinder. The upper sliding block is driven by the upper air cylinder to be inserted into or separated from the upper face of the movable pressing plate. The lower die is formed by a lower die plate, a lower sliding block, a lower air cylinder, a double-linkage oil cylinder and a lower puncher pin. The lower sliding block is driven by the lower air cylinder to be inserted into or separated from the upper face of the lower die plate. During working, by inserting or separating the upper sliding block and the lower sliding block, die closing and die opening are carried out in three times, and a blank B is extruded into a blank C, a blank D and a blank E step by step, so that the technical scheme that a metallographic streamline collecting mark is formed in the internal position of the product is changed, and the purposes of avoiding fractures and prolonging the service life of the product are achieved.

Description

technical field [0001] The invention relates to a cold extrusion molding die, in particular to a cold extrusion die for changing the position of the metallographic streamline converging mark of the product, which is used for cold extrusion molding of a connector product carrying a steering arm vibration damping bracket of an automobile. Background technique [0002] The metal products formed by the press and the cold extrusion die through the cold extrusion process are called cold extrusion products; the connectors used to carry the steering arm vibration damping bracket of the automobile are cold extrusion products made of carbon steel, hereinafter referred to as the connection Connector, the connector is composed of connecting ring 061, shoulder plate 062 and upper column 063, refer to Figure 11 , Figure 12 ; [0003] In actual application, the connectors formed by cold extrusion dies in the prior art have a short service life and are prone to breakage, and the fracture...

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Problems solved by technology

[0003] In actual application, the connectors formed by cold extrusion dies in the prior art have a short service life and are prone to breakage, and the fracture position is concentrated at the shoulder plate 062; The broken positions are all concentrated at the shoulder plate 062;

[0004] Tracing it to its cause, it can be seen from metallographic inspection etching profile, ASTME3-01 (2007) standard, refer to Figure 14 , the metallographic streamlines formed by the metal rheology during the cold extrusion molding process of the connector are collected at the shoulder plate 062 of the connector, that is, the metallographic streamline collection marks 09 of the connector are formed at the shoulder plate 062, because The microstructure of the metallographic streamline converging marks of carbon steel cold extrusion products is easy to delaminate, making this place a fragile link that is easy to break. However, the problem is that the shoulder plate 062 is the main load-bearing part of the connector. ; Therefore, there are problems and deficiencies in the prior art that are prone to breakage and short service life

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