CN201076897Y - Counter-die of integral closed flash forging die - Google Patents

Abstract

The utility model provides a lower die of an integrally closed flash forging die, which includes a die body, a cavity and a ejector rod. The rod hole communicates with the mold cavity, and the upper part of the mold cavity is provided with an extrusion cylinder whose periphery is closed as a whole. The utility model has the advantages of low cost, good forging quality and the like. During the pre-forging process of mechanical parts, there is an overall closed flash around the pre-forging, and the closed flash generates resistance, forcing the metal to fill the mold cavity. The forming process increases the flash resistance and improves the metal filling cavity. ability.

Description

A Whole Closed Flash Forging Die Lower Die

technical field

The utility model relates to a forging die capable of producing closed flash, which belongs to the technical field of dies.

Background technique

Mechanical parts with complex structures, high strength, toughness, mechanical properties and dimensional accuracy, such as rear axle brackets of automobiles, are usually produced by forging dies. Different forging processes use different forging die structures. The current forging process includes an open forging process and a closed forging process. In the open forging process, the forging die is provided with a flash groove, and the flash groove is open. During the forging process, the forging produces flash, and the flash plays a role in promoting metal The role of filling the cavity, but it is difficult to achieve one-fire forging, that is, the entire forging process can be completed by heating the blank only once, and the material utilization rate is low, and the quality of the forging is poor; in the closed forging process, the forging mold has no flash groove In the forging process, the forgings are directly formed in the closed cavity without flash. The forging quality and material utilization rate of closed forging are high, but the requirements for preform, forging temperature control and preform precision are high, and special forging equipment is required , high investment, high mold cost, low life, and high overall production cost.

Contents of the invention

Aiming at the shortcomings of the existing open forging and closed forging dies, the utility model provides an integrally closed flash forging lower die with low cost and good forging quality.

The lower mold of the overall closed flash forging die of the utility model includes a mold body, a cavity and a ejector rod. The cavities are connected, and the upper part of the cavity is provided with an extrusion cylinder whose periphery is closed as a whole.

The utility model has the advantages of low cost, good forging quality and the like. During the pre-forging process of mechanical parts, there is an overall closed flash around the pre-forging. The closed flash generates resistance, forcing the metal to fill the mold cavity. The forming process increases the flash resistance and improves the metal filling cavity. ability.

Description of drawings

Accompanying drawing is the forging mold structure schematic diagram of the utility model.

Among them: 1. Die body, 2. Cavity, 3. Ejector, 4. Extrusion cylinder.

Detailed ways

The forging process of mechanical parts including automobile rear axle brackets is generally: blanking - billet making - pre-forging - final forging - trimming - shaping. The billet making process is to hot forge the initial billet, and obtain a preform with a reasonable metal volume distribution after 2 to 3 billet making steps. The preform is then subjected to pre-forging, which is achieved through forging dies and hot forging presses. The pre-forging die includes an upper die and a lower die. The lower die adopts the closed flash forging die of the present utility model. Its structure is shown in the accompanying drawings, including a die body 1, a cavity 2 and a push rod 3. The inner upper part of the die body 1 There is a mold cavity 2, and the ejector pin 3 is installed in the ejector pin hole at the bottom of the mold body 1, and the ejector pin hole communicates with the mold cavity 2, and the upper part of the mold cavity 2 is provided with an extrusion cylinder 4 with an integrally closed periphery. Pre-forging is the most complicated process of deformation. During pre-forging, the pre-forging is pressed down with the upper die of the mold to produce flashes and flow to the outer edge. When it hits the side wall of the extrusion cylinder 4 on the upper part of the lower mold cavity 2 Hold; when the pressure is continued, the upper and lower molds of the mold form a closed cavity, and the resistance of the closed burr becomes larger and larger until the metal completely fills the cavity between the upper and lower molds. When the pre-forging ends, the ejector pin 3 pushes the forging out of the die body 1 . The key points of the design of the closed flash forging die of the utility model are as follows: the principle of the cavity design is to focus on the parts affecting the metal flow in the cavity, and simplify the shape to reduce the metal flow resistance and facilitate cavity filling. Parameters such as the lateral gap between the upper and lower dies of the mold, the slope of the side wall of the extrusion cylinder, and the distance from the extrusion cylinder wall to the contour of the forging should be considered based on factors such as forging equipment, mold precision, and metal flow during the forming process. For example, the main parameters of the pre-forging die for a certain type of automobile rear axle bracket are: the value of the lateral gap between the upper and lower dies is 1mm, and the inclination of the side wall of the extrusion cylinder is 1.5°; the side wall of the extrusion cylinder 4 to The average distance of the forging profile is 30mm.

Claims (1)

1. A lower die of an integrally closed flash forging die, comprising a mold body, a cavity and a push rod, the inner upper part of the die body is provided with a cavity, and the push rod is installed in the bottom push rod hole of the mold body, and the push rod hole and The mold cavity is connected, and the characteristic is that: the upper part of the mold cavity is provided with an extrusion cylinder whose periphery is closed as a whole.

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