CN109622840A - A kind of complicated 7075 aluminum alloy casing isothermy die forging methods of the more muscle classes of large size - Google Patents
A kind of complicated 7075 aluminum alloy casing isothermy die forging methods of the more muscle classes of large size Download PDFInfo
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- CN109622840A CN109622840A CN201811511258.2A CN201811511258A CN109622840A CN 109622840 A CN109622840 A CN 109622840A CN 201811511258 A CN201811511258 A CN 201811511258A CN 109622840 A CN109622840 A CN 109622840A
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- forging
- die forging
- isothermy
- aluminum alloy
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/002—Hybrid process, e.g. forging following casting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
- B21J1/06—Heating or cooling methods or arrangements specially adapted for performing forging or pressing operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J3/00—Lubricating during forging or pressing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
- B21J5/08—Upsetting
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- Forging (AREA)
Abstract
The present invention relates to a kind of complicated 7075 aluminum alloy casing isothermy die forging methods of the more muscle classes of large size.Forging is changed by systematic upsetting pull first, improves the included remaining as-cast structure of 7075 rodss and bars of aluminium alloy, then carry out die-forging forming, the service performance of casing forging can be increased substantially.For complex-shaped more 7075 aluminum alloy casings of muscle class, common die forging method is difficult to produce qualified product, and main problem is: filling that type difficulty is big, final forging temperature is low, depanning is difficult, surface quality is poor, tissue and performance are poor.The present invention changes the technique thinking of forging, loose tool system famine, isothermal die forging process molding (with mixed lubrication and default ejection) using open die forging upsetting pull, Forming Quality, tissue and the performance quality of complicated 7075 aluminum alloy casings of large-scale more muscle classes can be effectively improved, and increases substantially qualification rate and production efficiency.
Description
Technical field
The invention belongs to the technical field of hot working of aluminium alloy, are related to a kind of complicated 7075 aluminum alloy casings of the more muscle classes of large size
Isothermy die forging method.
Background technique
7075 alloys are aluminium-zinc-heat-treatable strengthened high-strength deformation aluminium alloys of magnesium-copper system, it can obtain various
The product of kind, size is current most popular high-strength aluminum alloy.It has several condition of heat treatment types: T6, T73
And T76.T6 state strength highest, fracture toughness is relatively low, sensitive to stress corrosion cracking, and drops because its toughness is reduced with temperature
It is low, therefore T6 state is not recommended generally for low temperature situation；T73 state strength is minimum, but has quite high fracture toughness and excellent
Good stress corrosion dehiscence resistant and anti-strip corrosive nature；T76 state has the intensity higher than T73 state and higher than T6 state
The comprehensive performance of anti-stress corrosion performance.The alloy long-term use temperature is usually no more than 125 DEG C.
Helicopter with the molding of complicated 7075 aluminum alloy casings of more muscle classes generally use casting and forming or common hot forging at
Type method.It is more to cast 7075 aluminum alloy casing defects, such as fleshiness hole, crackle, cold shut, incompleteness, is mingled with, ingredient unevenness
Equal as-cast structures inherent defect, leads to that properties of product are low, service life is shorter.Using common die forging method fill type difficulty compared with
Greatly, final forging temperature is low, and forging depanning difficulty is big, and surface quality is poor, and tissue and performance are also poor.
The present invention changes forging, loose tool system famine, isothermal die forging process molding (with mixed lubrication and default top using open die forging upsetting pull
Technique thinking out) can effectively improve Forming Quality, tissue and the performance matter of complicated 7075 aluminum alloy casings of large-scale more muscle classes
Amount, and increase substantially qualification rate and production efficiency.
Summary of the invention
The technical problems to be solved by the present invention are: in order to solve the complicated 7075 aluminum alloy casing forging of large-scale more muscle classes at
Type is difficult, tissue and performance quality is poor, qualification rate and production efficiency are low problem.
The technical scheme is that
A kind of complicated 7075 aluminum alloy casing isothermy die forging methods of the more muscle classes of large size are provided, comprising the following steps:
Step 1 heats 7075 aluminium alloy alloy bars, and heating temperature is 420 DEG C~450 DEG C, passes through after heat preservation
Repeatedly upsetting, pull out and change forging (can rationally be increased according to supplied materials virtual condition fiery time repeat to forge), upsetting/pull out single deflection is
40%~60%, obtain intermediate blank；
Step 2 heats intermediate blank to 420 DEG C~430 DEG C, carries out forging famine using dedicated loose tool after heat preservation, deflection is
30%~50%, obtain waste shape；
Step 3 is machined waste shape, to ensure surface quality；
Step 4 heats waste shape to 420 DEG C~430 DEG C, and isothermal die forging process is carried out after heat preservation, carries out 5 fire altogether；
Further comprise following steps:
Upsetting pull in step 1 changes forging, the loose tooling forging famine in step 2 is all made of 3T pneumatic hammer and (same type impact also can be used
Deform hammering equipment), preheating hammer anvil and operational instrument are to 200~250 DEG C before forging.
In step 1, when jumping-up, every hammer drafts was 50~70mm, and when pulling, every hammer amount of feeding was 80~100mm, between hammering
It is 1.5~2s every the time, Forge Heating temperature is between 420 DEG C~450 DEG C.In step 2, loose tool hammering speed should be delayed, and hammer
Interval time is 2~3s, and every hammer drafts is 40~60mm.
Final forging temperature in step 1 and step 2 is controlled at 350 DEG C or more.
Machining in step 3 includes: defect removal, corner angle are smooth, knuckle is round and smooth.Isothermal mould in step 4
Forging equipment be 31.5MN hydraulic press, pressing speed be 2~3mm/s, and the heating temperature in step 4 be 420 DEG C~430 DEG C it
Between, mould heating-up temperature is set as 420 ± 3 DEG C, and lubricant uses graphite+paraffin mixed lubrication (volume ratio of 1:4), using top
Device is used for forging depanning out.
The beneficial effects of the present invention are: conventional casting manufacturing method defect is more, cause properties of product it is low, using the longevity
It orders shorter.Or fill that type difficulty is larger, and final forging temperature is low using common die forging method, forging depanning difficulty is big, and surface quality is poor, group
It knits and performance is also poor.And use the complicated 7075 aluminum alloy casing forging of the more muscle classes of large size produced by the invention that can make up well
The deficiency of conventional manufacturing method, and greatly improve qualification rate and production efficiency.
Detailed description of the invention
Fig. 1 is to forge waste loose tool reference configuration schematic diagram；
Fig. 2 is waste blank structure schematic diagram；
Fig. 3 isothermal forging dies reference configuration figure；
Fig. 4 liftout attachment reference configuration figure.
Specific embodiment
The manufacture for choosing certain 7075 aluminum alloy casing forging of type helicopter below carries out the process step of the invention
Detailed description.
It forges waste loose tool reference configuration and sees Fig. 1；Final famine shape reference figuration such as Fig. 2；Isothermal forging dies reference configuration is shown in Fig. 3；
Liftout attachment reference configuration is shown in Fig. 4.Manufactured and designed with upper mold according to casing forging products design parameter.
A kind of complicated 7075 aluminum alloy casing isothermy die forging methods of the more muscle classes of large size are provided, comprising the following steps:
Step 1 heats alloy bar, and heating temperature is 450 DEG C, after heat preservation by upsetting repeatedly, pull out and change forging, can root
Rationally increase fiery time according to supplied materials virtual condition to repeat to forge, this example carries out 8 fire altogether, and 1 upsetting 1 of each fire time is pulled out, single
Upsetting/pull out deflection is 45%, obtains intermediate blank；
Step 2 heats intermediate blank to 420 DEG C, carries out forging famine using dedicated loose tool after heat preservation, deflection 40% obtains
To waste shape；
Step 3 is machined waste shape, to ensure surface quality；
Step 4 heats waste shape to 420 DEG C, and isothermal die forging process is carried out after heat preservation, carries out 5 fire altogether；
Further comprise following steps:
Upsetting pull in step 1 changes forging, the loose tooling forging famine in step 2 is all made of 3T pneumatic hammer and (same type impact also can be used
Deform hammering equipment), preheating hammer anvil and operational instrument are to 200 DEG C before forging.
In step 1, when jumping-up, every hammer drafts was 50mm, and when pulling, every hammer amount of feeding was 90mm, hammers interval time and is
1.5~2s, Forge Heating temperature is between 420 DEG C.In step 2, loose tool hammering speed should be delayed, and hammering interval time is 2~3s,
Every hammer drafts is 60mm.
Final forging temperature in step 1 and step 2 is controlled at 350 DEG C or more.
Machining in step 3 includes: defect removal, corner angle are smooth, knuckle is round and smooth.
Isothermal die forging process equipment in step 4 is 31.5MN hydraulic press, pressing speed 3mm/s, and the heating temperature in step 4
Degree is between 420 DEG C, and mould heating-up temperature is set as 420 ± 3 DEG C, and lubricant uses graphite+paraffin mixed lubrication, and this example is medium
Warm the 1st fire time of die forging uses graphite+paraffin 1:4, and intermediate fire time uses 1:8, and last 1 fire is lubricated using paraffin refined wax.Forging depanning
Using dedicated liftout attachment.
Change the work of forging, loose tool system famine, isothermal die forging process molding (with mixed lubrication and default ejection) by open die forging upsetting pull
Skill thinking can achieve Forming Quality, tissue and the performance quality for improving complicated 7075 aluminum alloy casings of large-scale more muscle classes and big
The purpose of width raising qualification rate and production efficiency.
Claims (8)
1. a kind of complicated 7075 aluminum alloy casing isothermy die forging methods of the more muscle classes of large size, which comprises the following steps:
Step 1 heats 7075 aluminium alloy bars, and heating temperature is 420 DEG C~450 DEG C, and upsetting is carried out after heat preservation, pulls out and changes
Forging, carries out 6 fire altogether, and upsetting/pull out single deflection is 40%~60%, obtains intermediate blank；
Step 2 heats intermediate blank to 420 DEG C~430 DEG C, and it is waste using loose tool to carry out forging after heat preservation, and deflection is 30%~
50%, obtain waste shape；
Step 3 is machined waste shape, to ensure surface quality；
Step 4 heats waste shape to 420 DEG C~430 DEG C, and isothermal die forging process is carried out after heat preservation, carries out 5 fire altogether.
2. isothermy die forging method as described in claim 1, which is characterized in that the upsetting pull in step 1 changes forging, the tire in step 2
Die forging famine is all made of 3T pneumatic hammer or same type blastic deformation hammering equipment, and hammer anvil and operational instrument are preheated before forging to 200~250
℃。
3. isothermy die forging method as described in claim 1, which is characterized in that in step 1, when jumping-up every hammer drafts be 50~
70mm, when pulling, every hammer amount of feeding was 80~100mm, and hammering interval time is 1.5~2s, Forge Heating temperature 420 DEG C~
Between 450 DEG C.
4. isothermy die forging method as described in claim 1, which is characterized in that in step 2, the interval time of loose tool hammering is 2
~3s, every hammer drafts are 40~60mm.
5. isothermy die forging method as described in claim 1, which is characterized in that the final forging temperature control in step 1 and step 2 exists
350 DEG C or more.
6. isothermy die forging method as described in claim 1, which is characterized in that the machining in step 3 includes: that defect is gone
It removes, corner angle are smooth, knuckle is round and smooth.
7. isothermy die forging method as described in claim 1, which is characterized in that the isothermal die forging process equipment in step 4 is 31.5MN
Hydraulic press, pressing speed is 2~3mm/s, and the heating temperature in step 4 is mould heating-up temperature between 420 DEG C~430 DEG C
It is set as 420 ± 3 DEG C, lubricant uses graphite+paraffin mixed lubrication, is used for forging depanning using liftout attachment.
8. isothermy die forging method as claimed in claim 7, which is characterized in that the lubricant graphite, paraffin volume ratio be
1:4。
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811511258.2A CN109622840A (en) | 2018-12-11 | 2018-12-11 | A kind of complicated 7075 aluminum alloy casing isothermy die forging methods of the more muscle classes of large size |
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| CN201811511258.2A CN109622840A (en) | 2018-12-11 | 2018-12-11 | A kind of complicated 7075 aluminum alloy casing isothermy die forging methods of the more muscle classes of large size |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111014537A (en) * | 2019-12-06 | 2020-04-17 | 陕西宏远航空锻造有限责任公司 | Forging method of large multi-rib complex 7050 aluminum alloy forging |
| CN112792271A (en) * | 2020-12-22 | 2021-05-14 | 西南铝业（集团）有限责任公司 | 7050 alloy forging production process |
| CN113000756A (en) * | 2019-12-19 | 2021-06-22 | 宝武特种冶金有限公司 | Isothermal forging method of titanium alloy case forging |
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| JPH0433737A (en) * | 1990-05-29 | 1992-02-05 | Mitsubishi Heavy Ind Ltd | Isothermal forging method for frm containing short fiber |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111014537A (en) * | 2019-12-06 | 2020-04-17 | 陕西宏远航空锻造有限责任公司 | Forging method of large multi-rib complex 7050 aluminum alloy forging |
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| CN113000756A (en) * | 2019-12-19 | 2021-06-22 | 宝武特种冶金有限公司 | Isothermal forging method of titanium alloy case forging |
| CN112792271A (en) * | 2020-12-22 | 2021-05-14 | 西南铝业（集团）有限责任公司 | 7050 alloy forging production process |
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Application publication date: 20190416 |