CN109352279A - A kind of die-forging forming method of TC4 titanium alloy circle-T shape Forging - Google Patents
A kind of die-forging forming method of TC4 titanium alloy circle-T shape Forging Download PDFInfo
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- CN109352279A CN109352279A CN201811354977.8A CN201811354977A CN109352279A CN 109352279 A CN109352279 A CN 109352279A CN 201811354977 A CN201811354977 A CN 201811354977A CN 109352279 A CN109352279 A CN 109352279A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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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
- B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K29/00—Arrangements for heating or cooling during processing
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Abstract
The invention discloses a kind of die-forging forming methods of TC4 titanium alloy circle-T shape Forging, the primary alpha phase of blank of the present invention is 55%-90%, and it is heated before blank forging using the primary heating of progress in electric furnace and insulating process twice, method of the invention passes through strict control raw material, forging temperature is determined according to the proportional region of blank primary alpha phase, optimize the bottom shape of forging, be conducive to metal forming, realize the Precise control of forging tissue, and use an igneous shape, it ensure that the streamline of forging, tissue and performance, improve forging tissue and consistency of performance.
Description
Technical field
The invention belongs to the forging and molding fields of titanium alloy forging, and in particular to a kind of TC4 titanium alloy circle-T shape Forging
Die-forging forming method.
Background technique
TC4 is a kind of alpha+beta diphasic titanium alloy of moderate strength, the beta stable element containing 6% α stable element Al and 4%
V.Forging technology and thermomechanical parameter have a significant impact the tissue of TC4 alloy forged piece, performance, process for forging and parameter choosing
It is improper to select, and the clear crystal grain of low power, nonuniform organization, final performance for being easy to produce forging are unqualified, and detects a flaw unqualified etc.
Problem.Secondly, TC4 alloy deformation drag is big, flow difficulties, forging has stringent grain flow line and ultrasonic examination requirement.When
When the local deformation amount of forging falls into critical strain area, due to there are deformation distortion can it is poor, local organization can be caused coarse, caused
Ultrasonic examination is unqualified.
Summary of the invention
The purpose of the present invention is to overcome the above shortcomings and to provide a kind of die-forging forming sides of TC4 titanium alloy circle-T shape Forging
Method realizes the Precise control of tissue, ensure that forging flaw detection is qualified.
In order to achieve the above object, the present invention the following steps are included:
Step 1, prepares blank, and the primary alpha phase of blank is 55%-90%；
Step 2 prepares blank according to size, weight and the forging deformation ratio of forging part；
Blank is cut into required shape, and coats protective coating on the surface of blank by step 3；
Electric furnace is warming up to 800 DEG C by step 4, and the blank after coating protective coating is put into progress first time guarantor in electric furnace
Temperature after heat preservation, with the heating rate of (100~150) DEG C/h, is warming up to 930~950 DEG C, carries out second and keep the temperature, take after heat preservation
Out；
The blank of taking-up is carried out die forging, trimming and machining, blank is processed into and meets roughing requirement by step 5
Forging is finally heat-treated by forging, completes die-forging forming.
In step 2, the weight of blank calculates as follows:
G1=(G2+g2)×1.01
Wherein, G1For the weight of blank, G2For the weight of forging part, g2For the weight of forging part flash.
In step 2, the calculation method of the size of blank is as follows:
The diameter D of blank1Are as follows:
D1=0.9 × D2, wherein D2For the diameter of forging part most big end；
The weight G of blank1Are as follows:
G1=ρ ν, wherein ρ is density, and ν is volume；
The height H of blank1Are as follows:
H1=4 × G1/(π·ρ·D1 2)。
In step 3, when cutting blank, to 2 × 45 ° of blank two ends chamfering.
In step 4, the uniformity of electric furnace is ± 10 DEG C.
In step 4, when keeping the temperature for the first time, soaking time, every millimeter of sotck thinkness heat preservation 0.4 are determined according to sotck thinkness
~0.5 minute；
When second of heat preservation, determine that soaking time, every millimeter of sotck thinkness keep the temperature 0.5~0.7 minute according to sotck thinkness.
In step 4, when keeping the temperature for the second time, when the primary alpha phase of blank is 55%-70%, holding temperature is 930 DEG C, when
When the primary alpha phase of blank is 71%-90%, holding temperature is 950 DEG C.
In step 5, the specific method is as follows for die forging:
Mold is preheating to 250~300 DEG C, using colloidal graphite mixed with water even application mold cavity, will be taken after heat preservation
Blank out is placed in the lower die of mold, and press machine upper mold falls, and stroke terminates, and forging is taken out in forging part molding, stops forging temperature
>=800 DEG C of degree.
In step 5, the specific method is as follows for trimming:
After the completion of die forging, upper die of punching press is risen, and the forging with waste heat is placed on the support mould of lower die, and upper mold is fallen,
Cut off extra overlap.
In step 5, the specific method is as follows for heat treatment:
Roughing requirement forging will be met to be fitted into vacuum drying oven, with the heating rate of (100~150) DEG C/h, be warming up to 700
~800 DEG C, keep the temperature cooling after 1~2h.
In step 5, ultrasonic examination inspection is carried out after heat treatment.
Compared with prior art, the primary alpha phase of blank of the present invention is 55%-90%, and before blank forging
Heating carries out once heating and twice insulating process using electric furnace is interior, and method of the invention passes through strict control raw material, according to
The proportional region of blank primary alpha phase determines forging temperature, optimizes the bottom shape of forging, is conducive to metal forming, realizes
The Precise control of forging tissue, and an igneous shape is used, it ensure that the streamline, tissue and performance of forging, improve forging
Tissue and consistency of performance.
Detailed description of the invention
Fig. 1 is flow chart of the invention；
Fig. 2 is the forging schematic diagram in the embodiment of the present invention 1；
Fig. 3 is the forging schematic diagram in the embodiment of the present invention 2；
Fig. 4 is the schematic diagram of roughing part in the present invention.
Specific embodiment
The present invention will be further described with reference to the accompanying drawings and examples.
Referring to Fig. 1, Fig. 2 and Fig. 4, embodiment 1:
The first step, forging G- Design；
Second step, blank are examined
It tests to blank, it is desirable that for blank in addition to meeting relevant criterion, primary alpha phase content is 60%.Alpha+beta/β phase transition
Point is 995 DEG C.
Third step, Blank calculation: according to the geomery of forging part and weight, forging deformation than calculate blank size and
Weight, diameter and length of the forging deformation than blank needed for calculating.Calculation method is as follows:
3.1. the weight of blank calculates:
The G of the weight of steps of manufacturing blanks1, the weight G of forging part2, forging part flash weight g2。
G1=(G2+g2)×1.01
G1=(8.14+0.9) × 1.01=9.13Kg
3.2. the size of blank:
Forging outside diameter D2, blank diameter D1,
D1=0.9 × D2
D1=0.9 × 152=136.8mm is rounded as 137mm.
The height D of blank1, according to metal volume ν, density p and weight G1Conversion relation obtain.
G1=ρ ν
The height H of blank1=4 × G1/(π·ρ·D1 2)
H1=4 × 9.13/ (3.14 × 4.44 × 1372)=139mm
4th step, cutting blank and chamfering: lathe is selected to cut blank and to 2 × 45 ° of blank two ends chamfering.
5th step, blank surface uniformly coat protective coating.
Heating: blank is placed in electric furnace heating, the uniformity requirement to electric furnace is ± 10 DEG C by the 6th step；The tool of heating
Body process is: electric furnace being first warming up to 800 DEG C, places the blanks in dedicated charging tray, 10mm is spaced between blank and blank, will be expected
Disk is put into electric furnace effective heating area, starts to keep the temperature, and calculates soaking time by 0.4 minute/mm of thickness, soaking time 55 is divided
Clock；After heat preservation, with the heating rate of 100 DEG C/h, 930 DEG C are warming up to, heat preservation is calculated by 0.6 minute/mm of thickness and kept the temperature
Time, soaking time 83 minutes.
7th step, hydraulic press die forging:
Die forging is carried out on a hydraulic press.Mold is preheating to 250~300 DEG C.Using colloidal graphite mixed with water even application
The steps of manufacturing blanks heated is placed in the lower die of mold by mold cavity, and press machine upper mold falls, and stroke terminates, forging part at
Type takes out forging with clamp.Forging deflection reaches 30% or more, stops forging temperature >=800 DEG C.
Trimming: 8th step after the completion of forging, carries out trimming using forging waste heat immediately.Remove Burr removal；By upper die of punching press liter
It rises, forging is stably placed on the support mould of lower die, upper mold is fallen, and cuts away extra overlap.
9th step, machining；
By forging process at meeting roughing drawing requirement.
Tenth step, heat treatment；
Forging is placed in vacuum drying oven and is heated, the uniformity requirement to electric furnace is ± 10 DEG C；The specific mistake of the heating
Cheng Shi: placing the blanks in dedicated charging tray, 10mm be spaced between blank and blank, with the heating rate of 100 DEG C/h, is warming up to
700 DEG C, 1h is kept the temperature, it is cooling.
11st step, ultrasonic examination.
Referring to Fig. 1, Fig. 3 and Fig. 4, embodiment 2:
The first step, forging G- Design；
Second step, blank are examined
It tests to blank, it is desirable that blank is in addition to meeting relevant criterion, and primary alpha phase content is 85%, alpha+beta/β phase transition
Point is 992 DEG C.
Third step, Blank calculation: according to the geomery of forging part and weight, forging deformation than calculate blank size and
Weight, diameter and length of the forging deformation than blank needed for calculating.Calculation method is as follows:
3.1. the weight of blank calculates:
The G of the weight of steps of manufacturing blanks1, the weight G of forging part2, forging part flash weight g2。
G1=(G2+g2)×1.01
G1=(19.99+1.9) × 1.01=22.10Kg
3.2. the size of blank:
Forging outside diameter D2, blank diameter D1,
D1=0.9 × D2
D1=0.9 × 197=177.3mm is rounded as 177mm.
The height D of blank1, according to metal volume ν, density p and weight G1Conversion relation obtain.
G1=ρ ν；
The height H of blank1=4 × G1/(π·ρ·D1 2)；
H1=4 × 22.10/ (3.14 × 4.44 × 1772)=202mm.
4th step, cutting blank and chamfering: lathe is selected to cut blank and to 2 × 45 ° of blank two ends chamfering.
5th step, blank surface uniformly coat protective coating.
Heating: blank is placed in electric furnace heating, the uniformity requirement to electric furnace is ± 10 DEG C by the 6th step；The tool of heating
Body process is: electric furnace being first warming up to 800 DEG C, places the blanks in dedicated charging tray, 10mm is spaced between blank and blank, will be expected
Disk is put into electric furnace effective heating area, starts to keep the temperature, and calculates soaking time by 0.5 minute/mm of thickness, soaking time is 89 points
Clock；After heat preservation, with the heating rate of 150 DEG C/h, 950 DEG C are warming up to, heat preservation is calculated by 0.7 minute/mm of thickness and kept the temperature
Time, soaking time are 124 minutes.
7th step, hydraulic press die forging:
Die forging is carried out on a hydraulic press.Mold is preheating to 250~300 DEG C.Using colloidal graphite mixed with water even application
The steps of manufacturing blanks heated is placed in the lower die of mold by mold cavity, and press machine upper mold falls, and stroke terminates, forging part at
Type takes out forging with clamp.Stop forging temperature >=800 DEG C.
Trimming: 8th step after the completion of forging, carries out trimming using forging waste heat immediately.Remove Burr removal；By upper die of punching press liter
It rises, forging is stably placed on the support mould of lower die, upper mold is fallen, and cuts away extra overlap.
9th step, machining；
By forging process at meeting roughing drawing requirement.
Tenth step, heat treatment；
Forging is placed in vacuum drying oven and is heated, the uniformity requirement to electric furnace is ± 10 DEG C；The specific mistake of the heating
Cheng Shi: placing the blanks in dedicated charging tray, 10mm be spaced between blank and blank, with the heating rate of 150 DEG C/h, is warming up to
800 DEG C, 2h is kept the temperature, it is cooling.
11st step, ultrasonic examination.
Claims (10)
1. a kind of die-forging forming method of TC4 titanium alloy circle-T shape Forging, which comprises the following steps:
Step 1, prepares blank, and the primary alpha phase of blank is 55%-90%；
Step 2 prepares blank according to size, weight and the forging deformation ratio of forging part；
Blank is cut into required shape, and coats protective coating on the surface of blank by step 3；
Electric furnace is warming up to 800 DEG C by step 4, and the blank after coating protective coating is put into progress first time heat preservation in electric furnace,
After heat preservation, with the heating rate of (100~150) DEG C/h, 930~950 DEG C are warming up to, second is carried out and keeps the temperature, taken out after heat preservation；
The blank of taking-up is carried out die forging, trimming and machining by step 5, and blank is processed into and meets roughing requirement forging
Forging is finally heat-treated by part, completes die-forging forming.
2. a kind of die-forging forming method of TC4 titanium alloy circle-T shape Forging according to claim 1, which is characterized in that step
In rapid two, the weight of blank calculates as follows:
G1=(G2+g2)×1.01
Wherein, G1For the weight of blank, G2For the weight of forging part, g2For the weight of forging part flash.
3. a kind of die-forging forming method of TC4 titanium alloy circle-T shape Forging according to claim 1, which is characterized in that step
In rapid two, the calculation method of the size of blank is as follows:
The diameter D of blank1Are as follows:
D1=0.9 × D2, wherein D2For the diameter of forging part most big end；
The weight G of blank1Are as follows:
G1=ρ ν, wherein ρ is density, and ν is volume；
The height H of blank1Are as follows:
H1=4 × G1/(π·ρ·D1 2)。
4. a kind of die-forging forming method of TC4 titanium alloy circle-T shape Forging according to claim 1, which is characterized in that step
In rapid four, the uniformity of electric furnace is ± 10 DEG C.
5. a kind of die-forging forming method of TC4 titanium alloy circle-T shape Forging according to claim 1, which is characterized in that step
In rapid four, when keeping the temperature for the first time, determine that soaking time, every millimeter of sotck thinkness keep the temperature 0.4~0.5 minute according to sotck thinkness；
When second of heat preservation, determine that soaking time, every millimeter of sotck thinkness keep the temperature 0.5~0.7 minute according to sotck thinkness.
6. a kind of die-forging forming method of TC4 titanium alloy circle-T shape Forging according to claim 1, which is characterized in that step
In rapid four, when keeping the temperature for the second time, when the primary alpha phase of blank is 55%-70%, holding temperature is 930 DEG C, when coming into being for blank
When α phase is 71%-90%, holding temperature is 950 DEG C.
7. a kind of die-forging forming method of TC4 titanium alloy circle-T shape Forging according to claim 1, which is characterized in that step
In rapid five, the specific method is as follows for die forging:
Mold is preheating to 250~300 DEG C, using colloidal graphite mixed with water even application mold cavity, by what is taken out after heat preservation
Blank is placed in the lower die of mold, and press machine upper mold falls, and stroke terminates, and forging is taken out in forging part molding, stop forging temperature >=
800℃。
8. a kind of die-forging forming method of TC4 titanium alloy circle-T shape Forging according to claim 1, which is characterized in that step
In rapid five, the specific method is as follows for trimming:
After the completion of die forging, upper die of punching press is risen, and the forging with waste heat is placed on the support mould of lower die, and upper mold is fallen, excision
Extra overlap.
9. a kind of die-forging forming method of TC4 titanium alloy circle-T shape Forging according to claim 1, which is characterized in that step
In rapid five, the specific method is as follows for heat treatment:
It will meet in the secondary newborn vacuum drying oven of roughing requirement forging, with the heating rate of (100~150) DEG C/h, it is warming up to 700~
800 DEG C, keep the temperature cooling after 1~2h.
10. a kind of die-forging forming method of TC4 titanium alloy circle-T shape Forging according to claim 1, which is characterized in that step
In rapid five, ultrasonic examination inspection is carried out after heat treatment.
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Cited By (6)
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| CN110508734A (en) * | 2019-08-30 | 2019-11-29 | 中国航发动力股份有限公司 | A kind of near-net-shape method with warpage thin plate titanium alloy forging |
| CN111690889A (en) * | 2020-07-08 | 2020-09-22 | 沈阳工业大学 | Method for regulating TC4 titanium alloy phase ratio through heat treatment |
| CN112792273A (en) * | 2020-12-15 | 2021-05-14 | 东莞市新美洋技术有限公司 | Titanium alloy forging method, titanium alloy watch back shell and manufacturing method thereof |
| CN113211006A (en) * | 2021-04-08 | 2021-08-06 | 浙江先导精密机械有限公司 | Machining method for boss inclination angle of mechanical arm |
| CN114472773A (en) * | 2021-12-30 | 2022-05-13 | 遵义航天新力精密铸锻有限公司 | Integral forming process for mounting support points of aero-engine |
| CN114769483A (en) * | 2022-05-25 | 2022-07-22 | 浙江申吉钛业股份有限公司 | Titanium alloy femoral stem artificial limb die forging optimization method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110508734A (en) * | 2019-08-30 | 2019-11-29 | 中国航发动力股份有限公司 | A kind of near-net-shape method with warpage thin plate titanium alloy forging |
| CN111690889A (en) * | 2020-07-08 | 2020-09-22 | 沈阳工业大学 | Method for regulating TC4 titanium alloy phase ratio through heat treatment |
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| CN114472773A (en) * | 2021-12-30 | 2022-05-13 | 遵义航天新力精密铸锻有限公司 | Integral forming process for mounting support points of aero-engine |
| CN114769483A (en) * | 2022-05-25 | 2022-07-22 | 浙江申吉钛业股份有限公司 | Titanium alloy femoral stem artificial limb die forging optimization method |
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Application publication date: 20190219 |