CN109794522A - A kind of preparation method of fine grain magnesium alloy right-angled trapezium part - Google Patents
A kind of preparation method of fine grain magnesium alloy right-angled trapezium part Download PDFInfo
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- CN109794522A CN109794522A CN201910238499.2A CN201910238499A CN109794522A CN 109794522 A CN109794522 A CN 109794522A CN 201910238499 A CN201910238499 A CN 201910238499A CN 109794522 A CN109794522 A CN 109794522A
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Abstract
The invention discloses a kind of preparation methods of fine grain magnesium alloy right-angled trapezium part, this method is plastically deformed blank, then 180 ° of rotary billets continue to deform by applying pressure to the blank being placed in cavity plate, and by the control of blank temperature, the preparation of right-angled trapezium part is realized.This method can preparation engineering application large scale right angle ladder shape part, right-angled trapezium part surface quality is good, crystal grain is tiny, and mechanical property significantly improves, and mold preparation and technological operation it is simple, it is at low cost, can large-scale industrial production.
Description
Technical field
The invention belongs to Metal Forming fields, and in particular to a kind of preparation side of fine grain magnesium alloy right-angled trapezium part
Method.
Background technique
Magnesium resource is very abundant on earth, and magnesium alloy has density small, and specific strength and specific stiffness are high, and damping shock absorption is cut
It cuts processability and the features such as thermal conductivity is good, and electromagnetic shielding capability is strong, and product is easily recycled, is known as the green work of 21 century
Journey material, before the fields such as aerospace, defence and military, automobile, electronics all have important application value and wide market
Scape.With the expansion of magnesium alloy application range, demand of the relevant industries to magnesium alloy increasingly increases.
Compared with cast magnesium alloy, wrought magnesium alloy crystal grain is tiny, cast sturcture's defect is eliminated, thus the synthesis of product
Mechanical property greatly improves, but as structural material, and compared with steel etc., the ductility and intensity of magnesium alloy are relatively low.Research
Show that grained material shows very good performance, in recent years, develops such as high ratio extrusion, big strain rolling, channel
The deformation techniques such as corner extrusion, high pressure torsion, but high ratio extrusion and big strain rolling are limited by the limitation of technique, can only prepare
The bar or plate of small size, and apparent change occurs for front and back sample, and Equal-channel Angular Pressing specimen size is smaller, makes
Industrial application is extremely limited.For large-sized right-angled trapezium class magnesium alloy member, mainly added at present using extruding+machinery
The manufacture of work method, but it is squeezed the limitation of ratio, coarse grains, performance is low, and is machined after squeezing, waste of material
Seriously, therefore, based on the above deficiency, a kind of preparation method of fine grain magnesium alloy right-angled trapezium part is provided.
Summary of the invention
In view of the problems of the existing technology, the object of the present invention is to provide a kind of fine grain magnesium alloy right-angled trapezium parts
Preparation method.
Realize that the object of the invention technical solution follows the steps below:
(1) before deforming by blank and mold at 350 DEG C ~ 420 DEG C, 3h ~ 5h is kept the temperature；
(2) blank is placed in cavity plate, punch-pin downlink applies pressure to blank, is plastically deformed blank；
(3) lift punch-pin, rotate 180 ° along the punch-pin direction of motion after blank is taken out, be then placed in cavity plate, make punch-pin downlink
Pressure is applied to blank, is plastically deformed blank；
(4) 2-3 step is repeated；
(5) lift punch-pin, after blank is taken out in 350 DEG C ~ 420 DEG C of stove, keep the temperature 30min；
(6) 2-5 is repeated to walk 3 times.
Effect of the invention is:
1. large scale right angle ladder shape part can be prepared, right-angled trapezium part crystal grain is tiny, and mechanical property significantly improves；
2. drip molding surface quality is good, avoids conventional forging easily appearance cracking, edge and the deformation defects such as cydariform occur；
3. mold preparation and technological operation are simple, at low cost, can large-scale industrial production.
Detailed description of the invention
Fig. 1 the device of the invention overall structure diagram；
Fig. 2 is the microscopic structure of magnesium alloy right-angled trapezium part in embodiment 2；
Fig. 3 is the microscopic structure that extruding+machining process prepares magnesium alloy right-angled trapezium part.
Specific embodiment
The present invention will be further described in the following with reference to the drawings and specific embodiments.
Embodiment 1
A kind of preparation method of fine grain magnesium alloy right-angled trapezium part, using AZ80 magnesium alloy, the scantling are as follows: upper bottom 100mm,
Go to the bottom 200mm, high 250mm.The step of preparing magnesium alloy right-angled trapezium part using technical solution of the present invention is as follows:
(1) by blank heating to 400 DEG C before deforming, 3h is kept the temperature；Die punch is come downwards in cavity plate, realizes that mold integrally adds
Heat, 380 DEG C of heating temperature, soaking time 5h.
(2) lift punch-pin, blank is put into cavity plate, punch-pin downlink applies pressure to blank, makes blank that plasticity occur and becomes
Shape.
(3) lift punch-pin, rotate 180 ° along the punch-pin direction of motion after blank is taken out, be then placed in cavity plate, by punch-pin
Downlink applies pressure to blank, is plastically deformed blank.
(4) 2-3 step is repeated.
(5) lift punch-pin, after blank is taken out in 350 DEG C of stove, keep the temperature 30min.
(6) 2-5 is repeated to walk 3 times.
AZ80 magnesium alloy right-angled trapezium part crystallite dimension significantly refines, average grain size 1.2um, tension after timeliness
Intensity is 436MPa, elongation percentage 8.0%.
Embodiment 2
A kind of preparation method of fine grain magnesium alloy right-angled trapezium part should using Mg-8.5Gd-4.5Y-0.7Zn-0.5Zr magnesium alloy
Scantling are as follows: upper bottom 150mm, bottom 250mm, high 300mm.Magnesium alloy right-angled trapezium part is prepared using technical solution of the present invention
The step of it is as follows:
(1) by blank heating to 380 DEG C before deforming, 5h is kept the temperature；Die punch is come downwards in cavity plate, realizes that mold integrally adds
Heat, 400 DEG C of heating temperature, soaking time 5h.
(2) lift punch-pin, blank is put into cavity plate, punch-pin downlink applies pressure to blank, makes blank that plasticity occur and becomes
Shape.
(3) lift punch-pin, rotate 180 ° along the punch-pin direction of motion after blank is taken out, be then placed in cavity plate, by punch-pin
Downlink applies pressure to blank, is plastically deformed blank.
(4) 2-3 step is repeated.
(5) lift punch-pin, after blank is taken out in 380 DEG C of stove, keep the temperature 30min.
(6) 2-5 is repeated to walk 3 times.
Mg-Gd-Y-Zn-Zr magnesium alloy right-angled trapezium part crystallite dimension significantly refines, average grain size 2.4um,
As shown in Fig. 2, tensile strength is 506MPa, elongation percentage 9.0% after timeliness.
Embodiment comparative analysis:
Right-angled trapezium part same as Example 2 is prepared using extruding+machining process, degree of grain refinement is smaller, average
Crystallite dimension is 25um, as shown in figure 3, tensile strength is 426MPa, elongation percentage 7.0% after timeliness.
Claims (2)
1. a kind of preparation method of fine grain magnesium alloy right-angled trapezium part, which is characterized in that it the following steps are included:
(1) before deforming by blank and mold at 350 DEG C ~ 420 DEG C, 3h ~ 5h is kept the temperature；
(2) blank is placed in cavity plate, punch-pin downlink applies pressure to blank, is plastically deformed blank；
(3) lift punch-pin, rotate 180 ° along the punch-pin direction of motion after blank is taken out, be then placed in cavity plate, make punch-pin downlink
Pressure is applied to blank, is plastically deformed blank；
(4) 2-3 step is repeated；
(5) lift punch-pin, after blank is taken out in 350 DEG C ~ 420 DEG C of stove, keep the temperature 30min；
(6) 2-5 is repeated to walk 3 times.
2. the preparation method of fine grain magnesium alloy right-angled trapezium part according to claim 1, which is characterized in that mold includes recessed
Mould and pressure ram, the gradient of pressure ram is consistent with prepared right-angled trapezium part gradient, and female bottom has cushion block.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910238499.2A CN109794522A (en) | 2019-03-27 | 2019-03-27 | A kind of preparation method of fine grain magnesium alloy right-angled trapezium part |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910238499.2A CN109794522A (en) | 2019-03-27 | 2019-03-27 | A kind of preparation method of fine grain magnesium alloy right-angled trapezium part |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5071474A (en) * | 1990-06-15 | 1991-12-10 | Allied-Signal Inc. | Method for forging rapidly solidified magnesium base metal alloy billet |
| CN1827829A (en) * | 2006-03-22 | 2006-09-06 | 西安建筑科技大学 | Method and apparatus for preparing fine-grained material |
| CN201198488Y (en) * | 2008-05-12 | 2009-02-25 | 昆明理工大学 | Equipment for preparing superfine crystal grain by repeated upsetting extrusion deformation |
| CN105568191A (en) * | 2016-03-06 | 2016-05-11 | 哈尔滨理工大学 | Device and method for pulse current assisting multi-directional forging of toughened magnesium alloy |
| CN105970130B (en) * | 2016-05-31 | 2018-02-16 | 东北大学 | A kind of method that alternately backward extrusion prepares fine grain magnesium alloy |
-
2019
- 2019-03-27 CN CN201910238499.2A patent/CN109794522A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5071474A (en) * | 1990-06-15 | 1991-12-10 | Allied-Signal Inc. | Method for forging rapidly solidified magnesium base metal alloy billet |
| CN1827829A (en) * | 2006-03-22 | 2006-09-06 | 西安建筑科技大学 | Method and apparatus for preparing fine-grained material |
| CN201198488Y (en) * | 2008-05-12 | 2009-02-25 | 昆明理工大学 | Equipment for preparing superfine crystal grain by repeated upsetting extrusion deformation |
| CN105568191A (en) * | 2016-03-06 | 2016-05-11 | 哈尔滨理工大学 | Device and method for pulse current assisting multi-directional forging of toughened magnesium alloy |
| CN105970130B (en) * | 2016-05-31 | 2018-02-16 | 东北大学 | A kind of method that alternately backward extrusion prepares fine grain magnesium alloy |
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Application publication date: 20190524 |
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