CN104907473A - Method for hot processing of large die flat steel forged piece - Google Patents

Abstract

The invention relates to a method for hot processing of a large die flat steel forged piece. The method comprises the following steps: 1 after finishing steel ingot heating, performing overall upsetting according to the forging process requirements between a preheated plane upsetting plate and a rotating platform; 2 laying down steel ingot blank having undergone upsetting in a mode of capturing through a controller or a mode of hanging through an overhead crane and utilizing the plane upsetting plate to perform drawing out; 3 placing another side to stand in the vertical direction in a mode of capturing through the controller or a mode of hanging through the overhead crane and utilizing the plane upsetting plate to perform drawing out; 4 after leveling four sides, erecting the steel ingot blank and utilizing the plane upsetting plate to perform upsetting; 5 according to the process requirement dimensions, manufacturing flat square blank in the vertical direction on the plane upsetting plate, and choosing to return to a furnace for heating or continue performing drawing out to the dimension of a finished product according to the material temperature conditions. The method for hot processing of the large die flat steel forged piece serves as the optimization of a conventional die flat steel forged piece forging mode to guarantee forging deformation sufficiency and evenness.

Description

A kind of hot-working method of large mold band steel forging

Technical field

The present invention relates to equipment manufacturing field, relate generally to a kind of thermal processing distortion method of hydraulic press production mould steel forgings, particularly a kind of hot-working method of large mold band steel forging.

Background technology

Mould steel, as the main tool of equipment manufacturing, part processing, is broadly divided into cold work die steel by purposes, heat does mould steel and plastic die steel three class, for forging, punching press, cut type, die casting, injection moulding etc.Because mould use is not identical, but condition of work all more complicated, higher requirement is proposed to the performance of mould steel.

Cold work die steel should have higher hardness, intensity, wearability, enough toughness, and high quenching degree, hardenability and other processing performances.The carbon content of cold work die steel is higher, and it organizes major part to belong to hypereutectoid steel or ledeburite steel, and normal steels has high-carbon low-alloy steel, high-carbon high-chromium steel, chrome-molybdenum steel etc.Hot die steel should have higher hardness, intensity, thermohardening, wearability, enough toughness, more will possess good elevated temperature strength, heat fatigue stability, thermal conductivity and rotproofness, also will possess higher quenching degree and require tissue uniformity as far as possible.Cold work die steel generally belongs to sub-eutectoid steel, and normal steels has Chromador, chrome-nickel steel, chrome-tungsten steel etc.Plastic die steel should have certain intensity, hardness, wearability, heat endurance, rotproofness etc., in addition good manufacturability is possessed in addition, as little in thermal deformation, the feature such as good processability, grinding and polishing performance is good, repair welding performance is good, roughness is high, thermal conductivity.Hot die steel generally belongs to sub-eutectoid steel, and normal steels has chrome-molybdenum steel, chrome molybdenum silico-manganese steel, low-carbon high-chromium steel etc.

The specification of Flat Die Steel differs in size by service condition, and gauge is generally at 100mm ~ 1000mm, and width dimensions is generally at 500mm ~ 1500mm, and corresponding forging uses ingot shape generally at 5T ~ 35T.

At present, common Flat Die Steel forging method mainly contains FM method, WHF method and WHF+JTS method.Process route is roughly as follows: one, suppressing Steel ingot feeder head material is jumping-up pincers handles, two, direct jumping-up or pre-pulling is selected to carry out jumping-up according to ingot shape, three, according to the difference selecting forging method, carry out the main transformer shape of blank after jumping-up, make the blank of applicable finished size, four, carry out finished product pulling, ensure the corner angle effect of module forging and the finish of each plane.Sectional dimension due to module is general all comparatively large, and when especially ingot shape is larger, conventional Forging Technology is difficult to the adequacy and the uniformity that ensure good distortion.Often there is the problems such as qualified and uneven microstructure of detecting a flaw after forging.

Summary of the invention

The object of the invention is to overcome above-mentioned deficiency of the prior art provide a kind of as to the Optimal improvements of traditional dies band steel forging process for fuel mode to the hot-working method of the large mold band steel forging of the adequacy and uniformity that ensure forging deformation.

Technical scheme of the present invention is achieved in that a kind of hot-working method of large mold band steel forging, and this processing method comprises the steps:

After step 1, Heating Steel Ingots complete, not at rising head side pressure system pincers handle, between the plane upsetting plate and rotation platform of preheating in advance, require to carry out overall jumping-up to steel ingot according to Forging Technology;

Step 2, to capture with manipulation machine or overhead traveling crane hangs the mode of getting and fallen by the steel ingot blank after jumping-up, pull out technological requirement size with plane upsetting plate;

Step 3, to capture with manipulation machine or overhead traveling crane hangs the mode of getting and another side is put into vertical direction attentions, pull out technological requirement size with plane upsetting plate;

After step 4, smooth four sides, steel ingot blank is holded up, with plane upsetting plate jumping-up to technological requirement size;

Step 5, according to technological requirement size, the enterprising conduct of plane upsetting plate to making flat square billet, according to material temperature situation select return stove heating or continue pulling to finished size.

The good effect that technical scheme of the present invention produces is as follows: the present invention is by substituting the mode of upper flat anvil, the lower flat anvil forging of rotation platform replacement with plane upsetting plate, in a disguised form increase the size of flat anvil, effectively reduce the distortion initial stage after steel ingot jumping-up, and the unreasonable distortion carried out too small due to anvil width ratio, main deformation process significantly can increase deflection, reduce stagnant zone, to steel ingot center consolidation effect, especially more fully effective to the improvement effect of the defects such as Steel ingot feeder head center porosity, improve the flaw detection qualification rate of Flat Die Steel forging; The radial large deformation of the steel ingot increased, improves the otherness of forging lateral performance and longitudinal performance, improves the structural homogenity of forging, improve product quality level.

Accompanying drawing explanation

Fig. 1 is Flat Die Steel forging of the present invention distortion schematic diagram.

Detailed description of the invention

A hot-working method for large mold band steel forging, 18.5 ton of 718 refining steel ingot (hydrogen content < 2.0ppm) is forged into B*H=(405 ~ 500 by 5000 tons of hydraulic presses) mm*(1110 ~ 1310) heavy die block of mm.Concrete production process is as follows:

After steel ingot performs temperature by special heating schedule, come out of the stove to the rotation platform of preheating in advance by overhead traveling crane, then cover upper planar surface upset plate, the jumping-up height H=1100mm required according to Forging Technology carries out overall jumping-up.After steel ingot jumping-up, plane upsetting plate won by overhead traveling crane, and steel ingot blank is overturn 90 ° by manipulation machine, and overhead traveling crane is cover upper planar surface upset plate again, once depresses to 1200mm; Plane upsetting plate won by overhead traveling crane, and steel ingot blank is overturn 90 ° along other direction by manipulation machine again, and overhead traveling crane cover upper planar surface upset plate, once depresses to 1450mm.Repeat the distortion of the both direction after jumping-up, pressure height is to 1050mm, and flat anvil blank plane also returns stove heating 3 ~ 4 hours after slight chamfered edge.After again coming out of the stove, steel ingot is jumping-up H=1100mm again.On upper plane upsetting plate, lower rotation platform by steel ingot blank along axle, according to final finished size pulling to preformation base size B0*H0, return stove heating 2 ~ 3 hours.After again coming out of the stove, according to technological requirement, by blank pulling to the hot size of finished product module.

Implement 718 modules of the present invention's production compared with the module of producing before, flaw detection qualification rate is high, even tissue, lateral performance is good, indices is better than the technical protocol requirement signed with user, is subject to the height accreditation of user, for enterprise brings good economic benefit.

Claims (1)

1. a hot-working method for large mold band steel forging, is characterized in that: this processing method comprises the steps:

After step 1, Heating Steel Ingots complete, not at rising head side pressure system pincers handle, between the plane upsetting plate and rotation platform of preheating in advance, require to carry out overall jumping-up to steel ingot according to Forging Technology;

Step 2, to capture with manipulation machine or overhead traveling crane hangs the mode of getting and fallen by the steel ingot blank after jumping-up, pull out technological requirement size with plane upsetting plate;

Step 3, to capture with manipulation machine or overhead traveling crane hangs the mode of getting and another side is put into vertical direction attentions, pull out technological requirement size with plane upsetting plate;

After step 4, smooth four sides, steel ingot blank is holded up, with plane upsetting plate jumping-up to technological requirement size;

Step 5, according to technological requirement size, the enterprising conduct of plane upsetting plate to making flat square billet, according to material temperature situation select return stove heating or continue pulling to finished size.