CN103658498A - Forging method for warm-forging inner star wheel - Google Patents

Abstract

The invention relates to a forging method for a warm-forging inner star wheel. The forging method comprises the following steps of heating the inner star wheel to be at 145-155 DEG C; spraying graphite on the surface of the inner star wheel to enable the surface to be isolated from outside air; feeding the inner star wheel into an intermediate frequency furnace and rising the temperature to be 880-920 DEG C after wind drying; feeding the inner star wheel into a four-station forging-pressing region to be subjected to forging and pressing, wherein the four-station forging and pressing step sequentially includes reshaping operation, rough forging operation, finish forging and forming operation and punching operation. The forging method for the warm-forging inner star wheel has the advantages that the temperature is constant, the time is uniform, the working conditions are consistent, and the surface is provided with a protective layer, so that forging-pressing pressure is stable in the forging process, the forming resistance is moderate, finally the size is stable, the part surfaces are clean and almost free of oxidation and decarburization, the internal organization grain size reaches to the level 7, and metal streamlines are clear and smooth.

Description

The forging method of warm forging star-wheel

Technical field

The present invention relates to a kind of forging method, relate in particular to a kind of forging method of warm forging star-wheel.

Background technology

In prior art, the forging of star-wheel is generally had to two kinds: the first, the forge hot that adopts temperature to be greater than 950 ℃, but its surface oxidation is serious, decarburization bed thickness, and change in size is large, also will just can reach internal organizational structure by normalizing heat treatment; The second, the cold extrusion under normal temperature, shaping resistance is large, rapid wear mould, and need to repeatedly anneal, phospholeum, cost are high, it is large, seriously polluted to consume energy, these two kinds of methods are all unfavorable for the development of modern industry.

Summary of the invention

The technical issues that need to address of the present invention have been to provide a kind of forging method of warm forging star-wheel, are intended to solve the above problems.

In order to solve the problems of the technologies described above, the present invention realizes by following steps:

Star-wheel is heated to 145 ℃-155 ℃;

Star-wheel surface spraying graphite is by its surface and isolate from outer air;

Wind-force enters intermediate frequency furnace and heats to 880 ℃-920 ℃ after drying;

Entering four station forging and stamping regions forges and presses; Four described station forging and stamping are followed successively by: shaping, rough forge, finish forge moulding, punching.

Compared with prior art; the invention has the beneficial effects as follows: temperature constant, time unification, operating mode are consistent, surface matcoveredn again; make to cause in forging process; forging force is stable, and shaping resistance is moderate, and final size is stable; piece surface is clean; almost not oxidation and decarburization, interior tissue grain size reaches 7 grades, and metal streamline is clear, smooth.

The specific embodiment

Below in conjunction with the specific embodiment, the present invention is described in further detail:

The present invention realizes by following steps:

Star-wheel is heated to 145 ℃-155 ℃;

Star-wheel surface spraying graphite is by its surface and isolate from outer air;

Wind-force enters intermediate frequency furnace and heats to 880 ℃-920 ℃ after drying; Because of surperficial matcoveredn, do not have oxidation reaction;

Entering four station forging and stamping regions forges and presses; Four described station forging and stamping are followed successively by: shaping, rough forge, finish forge moulding, punching;

Use mechanical arm transfer components, productive temp 28 times/more than min, within size is strict controlled in 0.2mm, reach the object of finish forge.

First by blank surface ball blast, the sorting of weighing; Enter feed mechanism, by feeding track, enter pre-graphitization district and be heated to 150 ℃ and carry out graphite coating; And then entering intermediate frequency heating blank to 900 ℃, the blank by the qualified temperature of temperature control grouping system enters four stations forging and stamping regions; By mechanical arm transfer components therefrom, finally enter hopper.

The warm forging all processes coordination that must link up in the present invention is carried out by the program of setting simultaneously, first part is heated to 150 ℃, and surface spraying graphite allows surface and isolate from outer air; Wind-force enters intermediate frequency furnace and heats to 900 ℃ after drying, and because of surperficial matcoveredn, does not have oxidation reaction; Production process adopts mechanical type multistation to forge and press simultaneously, uses mechanical arm transfer components, productive temp 28 times/more than min, within size is strict controlled in 0.2mm, reach the object of finish forge; By step, carry out simultaneously, beat be two seconds once, the heat that each extruding produces and the heat of instantaneous distribution loss remain basically stable, the part of four stations is also substantially at same temperature.

When the present invention works, four stations forge in a mould bases and in minute shaping, rough forge, finish forge moulding, four stations of punching, four parts are synchronously carried out, often forge once, by Lifting Device, the part of four stations is ejected in mould simultaneously, manipulator is clamped rapidly four station parts and is sent in next station simultaneously, iterative cycles like this, finish forge goes out qualified products.

Adopting final purpose of the present invention is to obtain net-size forging in production in enormous quantities situation; Adopt warm forging technology, shaping resistance is little simultaneously, and relative pressure is also little, can suitably reduce equipment tonnage, and energy consumption is little, on environment impact useless, is the direction of FMT development.

Claims (1)

1. a forging method for warm forging star-wheel, by following steps, realize:

Star-wheel is heated to 145 ℃-155 ℃;

Star-wheel surface spraying graphite is by its surface and isolate from outer air;

Wind-force enters intermediate frequency furnace and heats to 880 ℃-920 ℃ after drying;

Entering four station forging and stamping regions forges and presses; Four described station forging and stamping are followed successively by: shaping, rough forge, finish forge moulding, punching.