CN104690198B - Forming method of large GH4169 alloy direct aging disc forging - Google Patents

Abstract

The invention discloses a technology of 'die forging for blank forming plus die forging for forming plus direct aging' for the forming problem of the large GH4169 alloy direct aging disc forging. Since the traditional 'free forging for blank forming' is changed into the 'die forging for blank forming', uncontrollable factors of larger heating number and deformation in a free forging procedure are eliminated; the control of heating and the deformation in a forging technology are guaranteed; a forging after final direct aging treatment can stably meet requirements of a level ten grain size; the production efficiency is improved; and the cost is lowered.

Description

A kind of forming method of large-scale gh4169 alloy direct aging disk forging

Technical field:

The present invention relates to the method for forging and molding of large-scale gh4169 alloy direct aging disk forging part, particularly projected area More than 0.2m²And grain size requires 10 grades of disk forge piece.

Background technology:

Gh4169 alloy is the nickel-base high-temperature conjunction of a kind of γ ＂ with body-centered tetragonal and face-centred cubic γ ＇ phase precipitation strength Gold, is mainly used in the crucial load part of Aero-Space equipment, and these crucial load parts forging used when manufacturing is to property Can there is very high requirement, the crucial load part for some engine core positions is it is desirable to the complete warm of gh4169 alloy forging After grain size after process reaches 10 grades, and routine has been forged, the grain size that solid-solution and aging heat treatment does not almost reach 10 grades will Ask, even if adopting direct aging Technology for Heating Processing, also due to the open die forging base moderate heat of routine time is more, deflection is uncontrollable Former thus result in technique unstable (crystal grain refinement it is critical only that the control to heating and deflection in forging technology, and freely Forging is difficult to control to), therefore according to the technique of traditional " open die forging base+die-forging forming+direct aging ", end product quality Unstable it is impossible to stable reach 10 grades of grain sizes and require.

Traditional gh4169 alloy disc class takes the side of " open die forging base+die forging " in the forging part of direct aging before processing Formula completes, and generally has following two typical process routes: Yi Zhongshi: upsetting cake → punching → horse expansion → reaming (ring billet) → die forging, This technique is more due to forging technology link and fire time, and the multiple small deformation of horse expansion process can lead to the inequality of blank tissue Even require it is more difficult to reach more than 8 grades grain sizes of ring billet.Second is: upsetting cake → punching → reaming (ring billet) → die forging, this side Case advantage is to eliminate horse to expand operation, improves efficiency, simultaneously because the increase of reaming link deflection improves the tissue water of ring billet Flat；Shortcoming is, after removal horse is expanded, to increased the difficulty of reaming, that is, reaming one fire completes more than 40% deflection, equipment energy Power requirement is higher, and the operability of technique needs to consider；Both the above process program due to being related to free forging process, by artificial because Element affects larger, unstable product quality, therefore is difficult to meet forging's block dimension and integrative organization's performance requirement.

The invention discloses a kind of technique of " die forging base+die-forging forming+direct aging ", by by traditional " freely Forging base " is changed to " die forging base ", and it is time more to eliminate open die forging operation moderate heat, and the uncontrollable factor of deflection is it is ensured that forging Make controlling it is ensured that the forging after final direct aging is processed can stably reach 10 grades of crystalline substance to heating and deflection in technique Granularity requirements, improve production efficiency, reduce cost.

The technical problem of the present invention is:

For the forging molding of large-scale gh4169 alloy direct aging disk forging part, according to traditional " open die forging base+ The technique of die-forging forming+direct aging ", end product quality is unstable it is impossible to the stable 10 grades of grain sizes that reach require.

Technical scheme:

Step 1 prefabricated blank, is completed upsetting cake and punching operation by the way of die-forging forming, controls deflection by mould Between 50% to 55%, to remove punching core material by machining, to improve ring billet size and metallurgical quality concordance；

Step 2 preforming, completes reaming operation using the swollen hole of die forging, controls deflection 20% to 25% by mould Between；

Step 3 die-forging forming, using the fiery molding of finish-forging die one, by mould control deflection 30% to 35% it Between；

Enter water in 30s after the completion of step 4 die-forging forming, be cooled to room temperature, complete direct aging and process.

The invention has the beneficial effects as follows:

Open die forging upsetting cake, punching are replaced using die-forging forming, improves technology stability；Ring is replaced using the swollen hole of die forging Roll, reasonable distribution and control deflection, improve ring billet performance；

On the whole, by traditional " open die forging base " is changed to " die forging base ", eliminate open die forging operation moderate heat Secondary more, the uncontrollable factor of deflection it is ensured that in forging technology to the control of heating and deflection it is ensured that finally directly when The grain size that forging after effect process can stably reach 10 grades requires, and improves production efficiency, reduces manufacturing cost.

Concrete case embodiment

Below with reference to embodiment, technical solution of the present invention is further described:

Large-scale gh4169 alloy direct aging disk forging of the present invention, external diameter φ 681mm, internal diameter φ 374mm, projection Area is about 0.25m², all round properties index of forging and grain size require to meet the requirement of xx-0515 standard (grain size will Ask 10 grades).

Its forging step is as follows in detail:

The first step designs the pattern of upsetting cake, increases drift in the centre up and down of pattern, bar is directly put into pattern In, hammer to certain height, make blank just be full of die cavity (not going out burr), complete prefabricated blank molding.

The web portion extension set at prefabricated blank center is added to fall by second step by mach mode, so far realizes traditional handicraft The work to be done of middle upsetting cake, two operations of punching, this operation deflection reaches more than 50%, and grain size can improve 2～2.5 Level.

3rd step design preforming tool, the lower mould of this mould has the fuse of a taper, and fuse has two kinds of gradients, Top is 15 degree, and lower section is 10 degree it is therefore an objective to by the gradient of taper fuse in swollen hole, realize traditional reaming operation to be done Work, this operation deflection is less, controls deflection between 20% to 25% by mould, mainly makes crystal grain no longer long Greatly.

After 4th step completes preforming operation, waste base is directly placed in finish-forging die die cavity, completes die forging final molding, This operation deflection reaches more than 30%, and crystal grain can refine 1～1.5 grade.

Enter water after the completion of 5th step die-forging forming in 30s, be cooled to room temperature, complete direct aging and process.

The homogeneous fire of forging process of this technique completes, and on the basis of meeting forging molding, after tested, finally can stablize To the microscopic structure (10 grades of grain sizes) meeting standard requirement.

Claims (1)

1. a kind of forming method of large-scale gh4169 alloy direct aging disk forging is it is characterised in that comprise the steps,

Step 1 prefabricated blank, completes upsetting cake and punching operation by the way of die-forging forming, controls deflection 50% by mould To between 55%, to remove punching core material by machining, to improve ring billet size and metallurgical quality concordance；

Step 2 preforming, completes reaming operation using the swollen hole of die forging, controls deflection between 20% to 25% by mould；

Step 3 die-forging forming, using the fiery molding of finish-forging die one, controls deflection between 30% to 35% by mould；

Enter water in 30s after the completion of step 4 die-forging forming, be cooled to room temperature, complete direct aging and process.