CN104707927B - A kind of improve variable cross-section aluminum alloy die forgings tissue and the hot-working method of performance - Google Patents
A kind of improve variable cross-section aluminum alloy die forgings tissue and the hot-working method of performance Download PDFInfo
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Abstract
The invention belongs to the technical field of hot working of variable cross-section aluminum alloy die forgings, particularly relate to a kind of improve variable cross-section aluminum alloy die forgings tissue and the hot-working method of performance.The present invention designs according to the structure of aluminum alloy die forgings variable cross-section and manufactures loose tool, with loose tool, blank is carried out sub-material and shaping；Design according to the profile of aluminum alloy die forgings variable cross-section and manufacture blocker, the size of blocker to leave certain distortion allowance for the forging of lower step, utilize blocker that blank is carried out blocking, it is achieved to carry out positioning and locally-shaped by blank with blocker, and make the deformation of each variable cross-section uniformly；Design according to the final size of aluminum alloy die forgings variable cross-section and manufacture finisher, being shaped forging to blank with finisher.The present invention makes cross section, variable cross-section aluminum alloy die forgings each position reach unanimity, and both ensure that the quenching degree of heat treatment and the uniformity of structure property, makes again variable cross-section aluminum alloy die forgings overall performance be greatly improved.
Description
Technical field
The present invention relates to the technical field of hot working of variable cross-section aluminum alloy die forgings.
Background technology
The variable cross-section aluminum alloy die forgings changes of section developed is bigger, and representative section maximum becomes
Change amount is 3.12 times, and equivalent altitude maximum variable quantity is 13 times, and the biggest changes of section will
Causing deflection in forging process to be very different, the tissue formed also has the most very much not
With, so that same forging part different parts mechanical performance also is difficult to identical, so, it is right to need
Appropriate design base structure in variable cross-section aluminum alloy die forgings forging process, optimizes deflection, and
To variable cross-section aluminum alloy die forgings during variable cross-section aluminum alloy die forgings is with after-baking
Tissue be adjusted reducing as far as possible variable cross-section aluminum alloy die forgings different cross section tissue and
Performance difference.
Generally variable cross-section aluminum alloy die forgings is to use ingot casting, bar or sheet material, is directly over certainly
By the method forged to be manufactured into blank, then through finisher die-forging forming, then to variable cross-section aluminum
Alloy die forgings carries out heat treatment, then variable cross-section aluminum alloy die forgings is carried out machining.Former
Some hot-working methods are primarily present problems with:
(1), in original variable cross-section aluminum alloy die forgings thermal processing molding method, open die forging is utilized
Making direct base, on the one hand base difficulty is big, and work efficiency is low, and batch supply is restricted,
And dimensional discrepancy is big between the blank produced, deflection is inconsistent, causes final production
Variable cross-section aluminum alloy die forgings structure property concordance poor.
(2) in original variable cross-section aluminum alloy die forgings thermal processing molding method, straight after base
Tap into the final die forging of row, owing to variable cross-section aluminum alloy die forgings section thickness changes greatly, lead
Mutagens cross-sectional aluminum alloy forging part local deformation is excessive or too small, easily produces coarse-grain or whirlpool occurs
Flow, wear the forging defects such as muscle；Sometimes result in variable cross-section aluminum alloy die forgings local to be not fully filled.
(3) in original variable cross-section aluminum alloy die forgings thermal processing molding method, straight after forging
Tap into row heat treatment, owing to variable cross-section aluminum alloy die forgings section thickness changes greatly, thickness is cut
At face, quenching degree is poor, is easily caused structure property uneven, it is impossible to meet variable cross-section forge die
Part uses requirement.
Summary of the invention
The technical problem to be solved is: optimize variable cross-section aluminum alloy die forgings base knot
Structure, improves base efficiency, it is ensured that dimensional uniformity；Reasonable distribution variable cross-section aluminum alloy die forgings
The deflection in each cross section in forging process, it is ensured that deformation uniformity, variable cross-section aluminium alloy mould
Forging is full of in order；Variable cross-section aluminum alloy die forgings takes machining before heat treatment
Method reduces thick large part sectional dimension, makes each position quenching degree in heat treatment process keep one
Cause, it is ensured that variable cross-section aluminum alloy die forgings even tissue, performance is consistent.
The technical scheme is that
A kind of improve variable cross-section aluminum alloy die forgings tissue and the hot-working method of performance, including system
Base, blocking, finish-forging and heat treatment, wherein forge the procedure of processing before step, heat treatment
As follows:
1. forging step
Step 1.1: use through the plate of prefabricated stretching as forging blank, then according to aluminum
The structure of alloy die forgings variable cross-section designs and manufactures loose tool, with loose tool, blank is carried out sub-material
And shaping, according to equivalent volume method, blank is divided into head and afterbody two parts, and closes according to aluminum
The structure of gold forging part variable cross-section carries out local shaping, to stay enough to follow-up blocking and finish-forging
Deflection.
Step 1.2: design according to the profile of aluminum alloy die forgings variable cross-section and manufacture blocker,
The size of blocker to leave certain distortion allowance for the forging of lower step, utilizes blocker to blank
Carry out blocking, it is achieved carry out positioning and locally-shaped by blank with blocker, and make each variable cross-section
Deformation is uniformly；
Step 1.3: design according to the final size of aluminum alloy die forgings variable cross-section and manufacture end
Forging die, is shaped forging to blank with finisher.
In forging step 1.1-1.3, the deflection of the blank of each step is all higher than 15%.
2. the procedure of processing before heat treatment
Before variable cross-section aluminum alloy die forgings heat treatment, remove variable cross-section aluminum alloy die forgings office
The thick big part in portion, makes cross section, variable cross-section aluminum alloy die forgings each position reach unanimity.
The invention has the beneficial effects as follows:
(1) loose tool is used the blank of variable cross-section aluminum alloy die forgings to be carried out sub-material and shaping, both
Ensure that the accuracy of this blank sub-material, again the blank divided has been carried out size Control, improve
Base efficiency, it is ensured that the concordance of variable cross-section aluminum alloy die forgings billet size；
(2) utilize blocker that variable cross-section aluminum alloy die forgings carries out molding in advance, both cut becoming
Face aluminum alloy die forgings blank is positioned, and variable cross-section aluminum alloy die forgings carries out again local
Molding, and leave uniform deflection to the follow-up final die forging of variable cross-section aluminum alloy die forgings, protect
Card finally give streamline rationally, even tissue, crystal grain position tiny, each full condition good
Variable cross-section aluminum alloy die forgings；
(3) before variable cross-section aluminum alloy die forgings heat treatment, machining process is utilized to remove
The thick major part in variable cross-section aluminum alloy die forgings local, makes each position of variable cross-section aluminum alloy die forgings cut
Reaching unanimity in face, both ensure that the quenching degree of heat treatment and the uniformity of structure property, made again change
Cross-sectional aluminum alloy forging part overall performance is greatly improved.
Detailed description of the invention
Below by specific embodiment, the present invention is described in further detail.
A kind of improve variable cross-section aluminum alloy die forgings tissue and the hot-working method of performance, first adopt
Put into production as raw material with stretched prefabricated slab, become with according to aluminum alloy die forgings
The loose tool that the structure in cross section designs and manufactures carries out sub-material and shaping.Utilize according to aluminium alloy mould
The blocker that the profile of forging variable cross-section designs and manufactures the blank divided is carried out location and
Locally-shaped, finally design with according to the final size of aluminum alloy die forgings variable cross-section and manufacture
The complete molding of finisher, and before variable cross-section aluminum alloy die forgings heat treatment, carry out machinery add
Work removes variable cross-section aluminum alloy die forgings thickness major part, improves variable cross-section aluminum alloy die forgings
Structural homogenity and combination property.
Embodiment:
This variable cross-section aluminum alloy die forgings material is 7050-T74, belongs to ultrahigh-strength aluminum alloy,
Variable cross-section aluminum alloy die forgings overall size is 765mm × 380mm × 240mm, its maximum cross-section
Thickness is 392mm, its smallest cross-sectional a size of 30mm, and sectional dimension changes greatly, belongs to pass
Key load-carrying construction part, bears reversed fatigue load, it is desirable to even tissue, and integrated performance index is excellent
Different, the particularly anti-fatigue performance of variable cross-section aluminum alloy die forgings requires high to adapt to long service
Use requirement.Test with above-mentioned variable cross-section aluminum alloy die forgings totally 3.
(1) cutting a size of 177 × 280 × 718 with wire cutting method, weight is 99.6kg
Stretching precoated plate blank, with according to aluminum alloy die forgings variable cross-section on 1600T forcing press
The loose tool that structure designs and manufactures carries out sub-material and shaping.During sub-material and shaping, add
Hot temperature is 420 DEG C, and totally 5 fire complete sub-material and shaping, and often fire time deformation amount controlling is 17%,
Final forging temperature controls at >=360 DEG C, and loose tool, forging hammer anvil and other forging used tool are pre-
Hot temperature is 300 DEG C～350 DEG C.
(2) with the profile according to aluminum alloy die forgings variable cross-section on 8000T fly press
The blocker designing and manufacturing carries out blocking and with according to aluminum alloy die forgings variable cross-section
The finisher that whole size designs and manufactures carries out finish forging.Add during blocking and finish-forging
Hot temperature remains 420 DEG C, and Preform Die and finish-forging die preheating temperature are 250 DEG C, finish-forging
Temperature controls at >=360 DEG C.Blocking deformation amount controlling is about 20%, and 1 fire completes blocking；
Finish-forging deformation amount controlling is about 25%, and 2 fire complete finish forging.
Above-mentioned (1) (2) all heating are all carried out in resistance furnace.
(3) after completing variable cross-section aluminum alloy die forgings molding, and then to variable cross-section aluminium alloy
Forging part carries out heat treatment.Variable cross-section aluminum alloy die forgings heat treatment uses solid solution+twice timeliness
Method.Carry out machining before variable cross-section aluminum alloy die forgings heat treatment and remove variable cross-section aluminum
Alloy die forgings thickness major part, reduces heat treatment effective cross-section thickness, it is ensured that heat treatment is quenched
Property thoroughly.Using resistance furnace that variable cross-section aluminum alloy die forgings is carried out heat treatment, solid solubility temperature is
480 ± 10 DEG C, insulation >=90min, water-cooled of coming out of the stove；After half an hour, to variable cross-section aluminium alloy mould
Forging carries out a timeliness, and aging temp is 121 ± 5 DEG C, and temperature retention time 6～12h, after temperature
Variable cross-section aluminum alloy die forgings is directly come out of the stove air cooling；After half an hour, variable cross-section aluminum is closed
Gold forging part carry out secondary ageing process, aging temp is 175 ± 5 DEG C, temperature retention time 6～
8h, air cooling of after temperature, variable cross-section aluminum alloy die forgings directly being come out of the stove.
The present invention solves variable cross-section aluminum alloy die forgings molding and variable cross-section forge die
Present in part heat treatment process, section thickness changes greatly, deforms uneven, heat treatment quenching degree
The difficulty problem that difference, uneven microstructure, performance difference are big and not high enough, by use loose tool and
Blocker, solves variable cross-section aluminum alloy die forgings formation problems；By at variable cross-section aluminium alloy
It is thick big that the method being machined into before forging part heat treatment removes variable cross-section aluminum alloy die forgings
Portion of material, solves variable cross-section aluminum alloy die forgings heat treatment quenching degree problem.In a word, logical
Cross said method, finally give and fill that type is good, the variable cross-section of even tissue, excellent combination property
Aluminum alloy die forgings.
Claims (3)
1. improve variable cross-section aluminum alloy die forgings tissue and a hot-working method for performance, bag
Include base, blocking, finish-forging and heat treatment, it is characterised in that: forging step, heat treatment it
Front procedure of processing is specific as follows:
1) forging step
Step 1.1: use through the plate of prefabricated stretching as forging blank, then according to aluminum
The structure of alloy die forgings variable cross-section designs and manufactures loose tool, with loose tool, blank is carried out sub-material
And shaping, according to equivalent volume method, blank is divided into head and afterbody two parts, and closes according to aluminum
The structure of gold forging part variable cross-section carries out local shaping, to stay enough to follow-up blocking and finish-forging
Deflection；
Step 1.2: design according to the profile of aluminum alloy die forgings variable cross-section and manufacture blocker,
The size of blocker to leave certain distortion allowance for the forging of lower step, utilizes blocker to blank
Carry out blocking, it is achieved carry out positioning and locally-shaped by blank with blocker, and make each variable cross-section
Deformation is uniformly；
Step 1.3: design according to the final size of aluminum alloy die forgings variable cross-section and manufacture end
Forging die, is shaped forging to blank with finisher；
2) procedure of processing before heat treatment
Before variable cross-section aluminum alloy die forgings heat treatment, remove variable cross-section aluminum alloy die forgings office
The thick big part in portion, makes cross section, variable cross-section aluminum alloy die forgings each position reach unanimity.
2. hot-working method as claimed in claim 1, it is characterised in that: in forging step
Described loose tool, blocker, the preheating temperature of finisher are 300 DEG C～350 DEG C.
3. hot-working method as claimed in claim 1, it is characterised in that: forging step
In 1.1-1.3, the deflection of the blank of each step is all higher than 15%.
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| CN107159831A (en) * | 2017-06-30 | 2017-09-15 | 陕西宏远航空锻造有限责任公司 | A kind of forging method of cross forging part |
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| CN114799004B (en) * | 2022-04-28 | 2023-12-22 | 中国第二重型机械集团德阳万航模锻有限责任公司 | Forming method of thin web forging |
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