CN101633020A - Processing technique for manufacturing housing of digital camera by magnesium alloy stamping part - Google Patents
Processing technique for manufacturing housing of digital camera by magnesium alloy stamping part Download PDFInfo
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- CN101633020A CN101633020A CN200910069954A CN200910069954A CN101633020A CN 101633020 A CN101633020 A CN 101633020A CN 200910069954 A CN200910069954 A CN 200910069954A CN 200910069954 A CN200910069954 A CN 200910069954A CN 101633020 A CN101633020 A CN 101633020A
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- magnesium alloy
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Abstract
The invention discloses a processing technique for manufacturing a housing of a digital camera by a magnesium alloy stamping part. The processing technique comprises steps of; firstly a magnesium alloy sheet material is blanked and punched with a blanking die and a punching die to be manufactured into a housing fabricated part, and then the housing fabricated part is heated up and the temperature maintains between 360 DEG C to 390 DEG C, and finally the preheated housing fabricated part is put on a crank pressing machine for deep drawing and molding. The processing technique realizes that the magnesium alloy stamping part is used for manufacturing the housing of the digital camera; the punching forming is the processing technique with higher difficulty which has great market advantage and vast potential for further development as the processing technique has high production efficiency and can directly use the rolling sheet material with excellent performances.
Description
Technical field
The present invention relates to the housing of digital camera manufacture field, in particular, relate to utilize the processing technology of manufacturing housing of digital camera by magnesium alloy stamping part.
Background technology
Magnesium alloy is one of the lightest engineering metal material, has performances such as good specific strength, specific stiffness, be particularly suitable for making in light weight, intensity is high, the engineering structure parts of damping noise reduction requirement and the shell part of certain requirement of strength is arranged.
The essential element of magnesium alloy is a magnesium, and mix a spot of magnesium or other technologies add strong hardness.Characteristics such as magnesium alloy has light weight, be easy to heat radiation, crushing resistance is stronger.Therefore pursue now the age ultra-thin, the fashion type, the magnesium alloy notebook computer makes with the most use.It also has shortcoming, and magnesium alloy is not very firm wear-resisting, and grown service time, and the color on surface can be worn away, and the surface easily is scratched.Moreover magnesium alloy has certain requirement on producing, and its moulding needs the collaborative complexity of moulding of carrying out of technologies such as punching press or die casting, causes cost higher relatively.
Along with magnesium alloy and development of technologies thereof, magnesium alloy has also obtained further popularization in the application of Chinese every field.The manufacturing process that magnesium alloy is commonly used has die casting, semi-solid casting, extrusion casint, extruding and rolling etc., and wherein 80% of magnesium-alloy material is to obtain by casting method.
Summary of the invention
Technical problem to be solved by this invention is, utilizes the stamp forming technology of magnesium alloy that a kind of processing technology of manufacturing housing of digital camera by magnesium alloy stamping part is provided.
The processing technology of manufacturing housing of digital camera by magnesium alloy stamping part of the present invention, carry out according to following step:
(1) magnesium alloy plate is carried out blanking with blanking die and punching die and the shell prefabricated component is made in punching;
(2) above-mentioned shell prefabricated component is heated up, temperature remains between 360 ℃-390 ℃;
(3) the shell prefabricated component after the preheating is positioned on the crank press, adopting nominal pressure is 1000KN, and the slide block number of strokes per minute is 65 times a drawing process at a slow speed, use have electrothermal tube around cupping tool stretch; Described cupping tool has temperature control system guaranteeing the temperature constant of cupping tool, in the drawing process cupping tool plug temperature at 120 ℃～150 ℃, cupping tool die temperature at 350 ℃～380 ℃; Between shell prefabricated component in the pull and stretch production after the preheating and blank holder and the cupping tool die Molykote is set.
The present invention has realized utilizing magnesium alloy stamping part to make housing of digital camera, the drawing of magnesium alloy is the higher production technology of a kind of technical difficulty, but with its production efficiency height, rolled plate that directly serviceability is good and have the very big market advantage and vast potential for future development.
In process for stamping and forming, drawing and forming is the most complicated, and difficulty is also bigger.Because the magnesium alloy crystal structure is close-packed hexagonal (Hcp), slip system is few, and plasticity is relatively poor under the normal temperature, generally must carry out drawing and forming more than 150 ℃.Magnesium alloy plate when 250 ℃ of left and right sides pull and stretch its pull and stretch than the normal temperature drawing forming limit that surpasses aluminium alloy and low carbon steel plate, the pull and stretch ratio of magnesium alloy plate cup shell pull and stretch can reach 2.0 in the time of 175 ℃, and in the time of 225 ℃, can reach 3.0, surpassed steel plate and aluminium sheet pull and stretch at room temperature than (being respectively 2.2 and 2.6).Magnesium alloy drawing and forming performance and steel plate and aluminium sheet pull and stretch performance at room temperature is close under this temperature.The present invention's employing has the cupping tool of heating and constant temperature function and the blank (shell prefabricated component) of suitable temperature has been realized magnesium alloy success pull and stretch, for housing of digital camera provides a kind of character excellent material.
The specific embodiment
The present invention carries out according to following step:
(1) magnesium alloy plate is carried out blanking with blanking die and punching die and the shell prefabricated component is made in punching;
(2) above-mentioned shell prefabricated component is heated up, temperature remains between 360 ℃-390 ℃;
(3) the shell prefabricated component after the preheating is positioned on the crank press, adopting nominal pressure is 1000KN, and the slide block number of strokes per minute is 65 times a drawing process at a slow speed, use have electrothermal tube around cupping tool stretch; Described cupping tool has temperature control system guaranteeing the temperature constant of cupping tool, in the drawing process cupping tool plug temperature at 120 ℃～150 ℃, cupping tool die temperature at 350 ℃～380 ℃; Between shell prefabricated component in the pull and stretch production after the preheating and blank holder and the cupping tool die Molykote is set.
Below the process for stamping and forming of magnesium alloy plate being produced housing of digital camera elaborates.
1 stamping Die Design
1.1 arrangement of stamping process
The housing of digital camera product is produced with process for stamping needs four procedures, that is: blanking, pull and stretch, deburring and punching.Manufacture and design three cover diels, that is: blanking die, cupping tool and punching die, trimming process step adopt manual mode to carry out.
1.2 stamping Die Design
Housing of digital camera is the part that cooperatively interacts, has strict assembly relation with other multiple little parts, and the interchangeability when considering actual use still will be strict with the cavity dimension precision of mould when carrying out the mould design.
This diel of manufacturing is used for doing experiment, is the complex structure degree of simplifying diel, the cycle of manufacturing that shortens mould, has adopted the single die of tape guide system to sign an undertaking structure so that adjust during design.The standard die set parameter of using is as follows:
1) blanking die mould bases size 700mm * 525mm (material: HT200)
2) cupping tool mould bases size 670mm * 520mm (material: HT200)
3) punching die mould bases size 670mm * 520mm (material: HT200)
1.3.1 choosing of mould structure
For the complex structure degree of simplifying diel, shorten manufacturing the cycle of mould, adopted the single die of tape guide system to sign an undertaking structure so that adjust.Blanking die, cupping tool, punching die mould bases material uses HT200.
1.3.2 blank determining dimensions
Handle by low box part, trimming allowance is got 0.4mm, and crooked straight portion length of run is calculated as follows:
Lz＝H+0.57Rd[5]
In the formula: the straight portion length of run of Lz--bending
H--pull and stretch total height
Garden, Rd--bottom angular radius
1.3.3 the design of blanking die, punching die
The structure of blanking die and punching die is relatively simple.Consider the punching press characteristic of magnesium alloy, get monolateral minimum blade clearance Cmin=0.015mm during design, 0.08mm is got in the monolateral discharging gap between stripper and the punch.
1.3.4 the design of cupping tool
Because the pull and stretch height of housing of digital camera is less, therefore drawing coefficient M＞M 1 has adopted the once drawing forming technology.In mould structure, adopted the rubber type elastic blank holding device of (spacing height is S=0.6mm) with stopper, apply axial force σ 2 for the flange deformed area, to prevent that product is wrinkling in the drawing process; Smooth and the pull and stretch product of bottom surface is not trapped in the concave die cavity when having adopted the rubber type bullet to push up mechanism with the assurance pull and stretch; With the 220V electrothermal tube be looped around that pull and stretch is protruding, die around, provide suitable thermograde to cupping tool.
2 punching production technology and products
2.1 choosing of material
The magnesium sheet material material that uses is AZ31B, and thickness is 0.6mm, and (%) is as shown in table 1 for its chemical composition.
The chemical composition of the magnesium sheet material material that table 1 uses
2.2 stamping-out production
AZ31B magnesium plate stamping-out performance at room temperature is relatively good, carries out blanking, punching with blanking die and punching die, and the ring-type burr of product is very little, repairs deburring a little and gets final product.
2.3 pull and stretch production
The pull and stretch production of AZ31B magnesium alloy plate is the critical process of punching production magnesium alloy housing of digital camera, technical difficulty is very high, main technologic parameters has drawing pressure, pull and stretch speed, blank temperature, mold preheating temperature, lubricating system, mould fillet, die clearance, pressure-pad-force etc., and these factors all have in various degree influence to the drawing and forming of blank.
2.3.1 pull and stretch speed
Magnesium alloy AZ31B sheet material has plasticity preferably under hot, even also can be out of shape under some are unfavorable for the stress, strain regime of other material forming, but that deformation velocity is difficult for is excessive.This is that the flow stress of magnesium alloy can increase thereupon because of the increase along with deformation velocity, and the fracture resistance of material is subjected to the influence of deformation velocity very little, and this makes plate early arrive the fracture stage, thereby produces the drawing crack defective.Therefore should adopt deep-drawing technique at a slow speed when pull and stretch, the measures such as size that can also take to repair pull and stretch gap and die entrance simultaneously improve the stress of material, make it that pull and stretch goes out qualified product under higher deformation velocity.For the thick AZ31B thin plate material of 0.6mm, the slide block number of strokes per minute is proper when being 65 times.
2.3.2 blank temperature
Though temperature is very big to the influence of the plasticity of wrought magnesium alloy, temperature is higher, plasticity better, resistance of deformation is lower, more is easy to drawing and forming, and is unsuitable too high.When the magnesium alloy temperature is higher than 400 ℃, because grain growth makes its plasticity reduce on the contrary, be unfavorable for the drawing and forming of sheet material, also be easy to generate oxide etch simultaneously, thereby the temperature range of blank should be selected in room temperature to 400 ℃ this interval.Through relatively learning repeatedly, blank temperature is best in the time of 360 ℃-390 ℃ during pull and stretch production experiment.
2.3.3 mold temperature
Because magnesium alloy has good thermal conductivity, when contacting with cold mould, blank temperature can reduce rapidly, the deformation temperature scope that adds magnesium alloy is narrow, thereby very easily produce the pull and stretch defective, be unfavorable for the carrying out of drawing and forming, so must carry out preheating to mould.Cupping tool adopts electrothermal tube to heat around mould, and is equipped with temperature control system to guarantee the temperature constant of cupping tool.Pull and stretch production when experiment, when plug temperature at 120 ℃～150 ℃, die temperature during at 350 ℃～380 ℃, the effect of drawing and forming is fine.
2.3.4 lubricant
The scuffing degree of magnesium alloy increases with the increase of temperature, and lubricant selects for use than even more important in cold forming in the hot forming of magnesium alloy.Adopt molybdenum bisuphide reagent to do lubricant when pull and stretch is produced, reduced the friction between blank and blank holder and the pull and stretch die effectively, strengthened the flowability of metal, prevent sticking to mould, and guarantee good part presentation quality.
Claims (2)
1. the processing technology of a manufacturing housing of digital camera by magnesium alloy stamping part is characterized in that, carries out according to following step:
(1) magnesium alloy plate is carried out blanking with blanking die and punching die and the shell prefabricated component is made in punching;
(2) above-mentioned shell prefabricated component is heated up, temperature remains between 360 ℃-390 ℃;
(3) the shell prefabricated component after the preheating is positioned on the crank press, adopting nominal pressure is 1000KN, and the slide block number of strokes per minute is 65 times a drawing process at a slow speed, use have electrothermal tube around cupping tool stretch; Described cupping tool has temperature control system guaranteeing the temperature constant of cupping tool, in the drawing process cupping tool plug temperature at 120 ℃～150 ℃, cupping tool die temperature at 350 ℃～380 ℃; Between shell prefabricated component in the pull and stretch production after the preheating and blank holder and the cupping tool die Molykote is set.
2. the processing technology of manufacturing housing of digital camera by magnesium alloy stamping part according to claim 1 is characterized in that, described magnesium alloy plate is AZ31B, and thickness is 0.6mm.
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| CN200910069954A CN101633020A (en) | 2009-07-30 | 2009-07-30 | Processing technique for manufacturing housing of digital camera by magnesium alloy stamping part |
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| CN200910069954A CN101633020A (en) | 2009-07-30 | 2009-07-30 | Processing technique for manufacturing housing of digital camera by magnesium alloy stamping part |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102133594A (en) * | 2010-12-16 | 2011-07-27 | 重庆大学 | Cold working forming method for magnesium alloy stamped mobile phone shell |
| CN102350456A (en) * | 2011-08-05 | 2012-02-15 | 北京广灵精华科技有限公司 | Processing method of magnesium alloy slab |
| CN102601207A (en) * | 2011-01-24 | 2012-07-25 | 福建工程学院 | Method for stamping magnesium alloy in cold state |
| CN102728712A (en) * | 2011-04-07 | 2012-10-17 | 沈阳航空航天大学 | Temperature punching progressive die of magnesium alloy shell piece |
| CN107175297A (en) * | 2017-07-18 | 2017-09-19 | 苏州春秋电子科技股份有限公司 | The hot shaping method of the steep radian of magnesium lithium alloy notebook computer casing |
| CN110560577A (en) * | 2019-08-30 | 2019-12-13 | 富钰精密组件（昆山）有限公司 | magnesium alloy part and preparation method thereof |
-
2009
- 2009-07-30 CN CN200910069954A patent/CN101633020A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102133594A (en) * | 2010-12-16 | 2011-07-27 | 重庆大学 | Cold working forming method for magnesium alloy stamped mobile phone shell |
| CN102601207A (en) * | 2011-01-24 | 2012-07-25 | 福建工程学院 | Method for stamping magnesium alloy in cold state |
| CN102728712A (en) * | 2011-04-07 | 2012-10-17 | 沈阳航空航天大学 | Temperature punching progressive die of magnesium alloy shell piece |
| CN102350456A (en) * | 2011-08-05 | 2012-02-15 | 北京广灵精华科技有限公司 | Processing method of magnesium alloy slab |
| CN102350456B (en) * | 2011-08-05 | 2013-08-14 | 北京广灵精华科技有限公司 | Processing method of magnesium alloy slab |
| CN107175297A (en) * | 2017-07-18 | 2017-09-19 | 苏州春秋电子科技股份有限公司 | The hot shaping method of the steep radian of magnesium lithium alloy notebook computer casing |
| CN110560577A (en) * | 2019-08-30 | 2019-12-13 | 富钰精密组件（昆山）有限公司 | magnesium alloy part and preparation method thereof |
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Open date: 20100127 |