CN100361762C - Mild hot formation method for making magnesium alloy shell of cell phone and mould specially for the same - Google Patents

Mild hot formation method for making magnesium alloy shell of cell phone and mould specially for the same Download PDF

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Publication number
CN100361762C
CN100361762C CNB2005100469602A CN200510046960A CN100361762C CN 100361762 C CN100361762 C CN 100361762C CN B2005100469602 A CNB2005100469602 A CN B2005100469602A CN 200510046960 A CN200510046960 A CN 200510046960A CN 100361762 C CN100361762 C CN 100361762C
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China
Prior art keywords
blank
die
punch
magnesium alloy
forming
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Expired - Fee Related
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CNB2005100469602A
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CN1903473A (en
Inventor
任丽梅
张士宏
徐永超
王忠堂
李章刚
郑文涛
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Institute of Metal Research of CAS
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Institute of Metal Research of CAS
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Abstract

A thermal shaping method for the Mg-alloy shell of mobile telephone features use of draw technology with a dedicated die set, which includes such steps as heating edge pressing ring and female die to 170-180 deg.C, coating lubricant onto die set and raw black of said Mg-alloy shell, heating the raw black, pre-heating the male die to 70-100 deg.C, and die pressing at 170-180 deg.C for drawing.

Description

A kind of mild hot formation method of magnesium alloy shell of cell phone
Technical field
The present invention relates to the sheet alloy stamp forming technology, be specially a kind of mild hot formation method and particular manufacturing craft thereof of magnesium alloy shell of cell phone, be mainly used in the warm deep-drawing technique of magnesium alloy plate and be shaped.
Background technology
Magnesium metal and alloy thereof are the lightest structural metallic materials of using in engineering so far, with light weight, good rigidly, metallic luster is good, electromagnetic wave shielding good and easy to be recycled be the magnesium alloy of characteristics, become Hyundai Motor, electronics, the preferred material of industries such as communication, magnesium-alloy material is to obtain by casting method at present, its shortcoming is that yield rate is low, product has more hole and loose, intensity is low, poor ductility, can not satisfy the serviceability of product requirements at the higher level, and cast member itself can not satisfy the compact requirement of magnesium alloy electronic product because the technological requirement wall thickness can not be too thin.
Sheet material drawing and forming processing mode has significant advantage aspect raising parts quality, productivity ratio, the saving material, and can process the thin-walled parts that casting can't process.For common metal and alloy thereof, drawing and forming has been mature technique very, but for magnesium alloy, the history of pull and stretch is also shorter.Mainly be because the close-packed hexagonal crystal structure of magnesium metal, cause the Plastic Forming at room temperature of most magnesium alloys very poor, elevated temperature, can improve its forming property effectively, usually need in 250-400 ℃ temperature range, shape, this will bring the drawback of mold system relative complex, the cost of product is also relatively more expensive simultaneously, and when heat time heating time is long, cause the inner crystal grain of sheet material thick easily, like this can the serious plastic deformation ability that reduces sheet material, this moment, blank was very crisp, during pull and stretch very easily in the place's drawing crack of drift fillet.In addition, magnesium alloy has significant sensitiveness to deformation velocity, and forming speed and lubricating process also are the important technical parameters of magnesium alloy plastic deformation.
Summary of the invention
The object of the present invention is to provide a kind of mild hot formation method and particular manufacturing craft thereof of magnesium alloy shell of cell phone, solve the quality problems that exist in the magnesium alloy drawing and forming, it can reduce production costs, and improves the quality and the production efficiency of product.
Technical scheme of the present invention is:
A kind of mild hot formation method of magnesium alloy shell of cell phone, its technological process is: heating blank holder and die → mould are coated with lubricant → blank and are coated with lubricant → blank heating → punch preheating → drawing and forming.Concrete warm forming step is as follows:
1) heating blank holder and die
10 of the resistor rods that even placement power is the 300W/ root in die are heated to 170 ℃~180 ℃ with blank holder and die;
2) mold lubrication and blank heating
On die, blank holder and blank, evenly smear lubricant, blank is put into mould, be heated to 170 ℃~180 ℃, and be incubated 2~5min;
3) punch is preheated to 70~100 ℃;
4) drawing and forming, forming speed are 0.5~2 mm/second;
Punch moves downward under the hydraulic press effect, speed is controlled at 0.5~2mm/s, behind the punch contact blank, the shaping cushion block that promotes in the die moves downward jointly, and the spring of shaping cushion block below is compressed, and the cushion block that is shaped simultaneously applies opposition to blank, after drawing and forming reaches the predetermined deformation amount, rise punch, spring reset ejects drip molding.
The PTFE (polytetrafluoroethylene (PTFE)) that adopts liquid is as lubricant, and this lubricant is not volatile, easy to use, and the drawback of bringing in the time of can avoiding using some conventional lubricant is as easy cleaning and lubricating layer are not inhomogeneous.It is evenly spread upon on die, blank holder and the blank, and the part that punch and blank contact with punch is not coated with lubricant.
A kind of warm forming particular manufacturing craft of magnesium alloy shell of cell phone has punch, blank holder, pull and stretch die, and the pull and stretch die of this mould adopts sectional type combination pull and stretch die, comprise fixedly die, fixedly can upper and lower mobile shaping cushion block in the die center drilling.
This mould only in die, be equipped with uniform heater finish blank and mould common add heat request.Described fixedly die sidewall radially evenly is equipped with resistor rod.
Described fixedly die bottom is provided with backing plate, and the connecting bolt external part that passes backing plate places fixedly die center drilling, is set with spring on the connecting bolt, and the shaping cushion block is installed on the connecting bolt external part, and the shaping cushion block is held by spring, constitutes automatic head part device.
The invention has the advantages that:
(1) stock utilization height.
(2) products surface quality is good, adopts the present invention, and the magnesium alloy shell of cell phone surface quality of manufacturing is good, rigidity strong, good hand touch, dimensionally stable.
(3) the present invention adopts warm drawing and forming, and 170 ℃~180 ℃ of forming temperatures are lower than 250 ℃ of the dark temperature of common magnesium alloy hot-drawn, and low forming temperature can reduce the complexity of operation, enhances productivity and has alleviated die wear, prolongs its service life.
(4) the present invention PTFE (polytetrafluoroethylene (PTFE)) of adopting liquid is lubricated the privileged site of die, blank holder and blank, this lubricant is not volatile, easy to use, the drawback of bringing in the time of can avoiding using some conventional lubricant is as easy cleaning and lubricating layer are not inhomogeneous.
(5) apparatus of the present invention are simple, and production cost is low, improve Mg alloy formed performance.The present invention adopts sectional type combination pull and stretch die on mould structure, make die change simple, can improve 3 times die life, and the shaping cushion block that makes up the pull and stretch die has simultaneously improved the stress of drip molding, improves yield rate.
(6) mould of the present invention only in die, be equipped with uniform heater finish blank and mould common add heat request, reduced the blank temperature reduction, and reduced die cost.
Description of drawings
Fig. 1 is a die structure dwg of the present invention.Among the figure: 1, backing plate; 2, fixing die; 3, resistor rod bottoming hole; 4, blank holder; 5, alignment pin; 6, punch; 7, fixed head; 8, blank; 9, connecting bolt; 10, shaping cushion block; 11, spring.
Fig. 2 is the section of structure of punch.
Fig. 3 is the upward view of Fig. 2.
Fig. 4 is the fixing vertical view of die.
Fig. 5 is the A-A profile of Fig. 4.
Fig. 6 is the section of structure of the shaping cushion block in the die.
Fig. 7 is the vertical view of Fig. 6.
The specific embodiment
As shown in Figure 1, the warm forming particular manufacturing craft of magnesium alloy shell of cell phone comprises backing plate 1, fixedly die 2, resistor rod bottoming hole 3, blank holder 4, alignment pin 5, punch 6, fixed head 7, blank 8, connecting bolt 9, shaping cushion block 10, spring 11 etc., punch 6 is fixed on the upper bolster by fixed head 7, sectional type combination pull and stretch die is by backing plate 1, fixedly die 2, resistor rod bottoming hole 3, shaping cushion block 10 are formed, and shaping cushion block 10 passes through connecting bolt 9 and is connected with backing plate 1 with spring 11.
The invention provides a kind of mild hot formation method of magnesium alloy shell of cell phone, its flow process is as follows: heating blank holder and die → mould are coated with lubricant → blank and are coated with lubricant → blank heating → punch preheating → drawing and forming.Concrete warm forming step is as follows:
1) heating blank holder and die
10 of the resistor rods that even placement power is the 300W/ root in die are heated to 170 ℃~180 ℃ with blank holder and die;
2) mold lubrication and blank heating
Blank holder and die are heated to 170 ℃~180 ℃, evenly smear lubricant PTFE (polytetrafluoroethylene (PTFE)) on die, blank holder and blank, the part that punch and blank contact with punch is not coated with lubricant; Blank is put into mould, be heated to 170 ℃~180 ℃, insulation 2~5min;
3) punch is preheated to 80~100 ℃;
4) drawing and forming, forming speed are 0.5~2mm/s;
Punch 6 moves downward under the hydraulic press effect, speed is controlled at 0.5~2mm/s, behind the punch contact blank 8, promote shaping cushion block 10 associated movements in the die, spring 11 is compressed, and the cushion block that is shaped simultaneously applies opposition to blank, after drawing and forming reaches the predetermined deformation amount, rise punch 6, spring 11 resets, and ejects drip molding; Put blank holder and continue the next part of heating shaping.
Embodiment
Choose magnesium alloy AZ31 rolled sheet metal, be machined to 120mm * 70mm, radius of corner is the 30mm blank.After above-mentioned technology drawing and forming reaches the predetermined deformation amount, rise punch, spring reset ejects drip molding, and the magnesium alloy shell of cell phone surface quality of employing manufacturing of the present invention is good, rigidity strong, shape and size precision height.The process technological parameter is as shown in the table:
Sotck thinkness/mm Blank holder and die heating-up temperature/℃ Blank temperature retention time/min The punch preheat temperature/℃ Pull and stretch speed/mm/s
0.6 170 5 70 0.5
0.7 175 4 90 1
0.7 180 2 100 2

Claims (3)

1. the mild hot formation method of a magnesium alloy shell of cell phone is characterized in that technological process is: heating blank holder and die → mould are coated with lubricant → blank and are coated with lubricant → blank heating → punch preheating → drawing and forming, and concrete warm forming step is as follows:
1) heating blank holder and die
In die, evenly place resistor rod, blank holder and die are heated to 170 ℃~180 ℃;
2) mold lubrication and blank heating
On die, blank holder and blank, evenly smear lubricant, blank is put into mould, be heated to 170 ℃~180 ℃, and be incubated 2~5min;
3) punch is preheated to 70~100 ℃;
4) drawing and forming, forming speed are 0.5~2mm/s;
Punch moves downward under the hydraulic press effect, speed is controlled at 0.5~2mm/s, behind the punch contact blank, the shaping cushion block that promotes in the die moves downward jointly, and the spring of shaping cushion block below is compressed, and the cushion block that is shaped simultaneously applies opposition to blank, after drawing and forming reaches the predetermined deformation amount, rise punch, spring reset ejects drip molding.
2. according to the mild hot formation method of the described magnesium alloy shell of cell phone of claim 1, it is characterized in that: described lubricant adopts the polytetrafluoroethylene (PTFE) of liquid, evenly spreads upon on die, blank holder and the blank.
3. according to the mild hot formation method of the described magnesium alloy shell of cell phone of claim 1, it is characterized in that: resistor rod is 10 in the described step 1) die, and power is the 300W/ root.
CNB2005100469602A 2005-07-29 2005-07-29 Mild hot formation method for making magnesium alloy shell of cell phone and mould specially for the same Expired - Fee Related CN100361762C (en)

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CN100361762C true CN100361762C (en) 2008-01-16

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CN102133594A (en) * 2010-12-16 2011-07-27 重庆大学 Cold working forming method for magnesium alloy stamped mobile phone shell
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
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CN102397929B (en) * 2011-08-05 2014-06-11 北京广灵精华科技有限公司 Method for processing magnesium alloy plate
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CN103286182B (en) * 2013-05-09 2014-12-24 重庆大学 Magnesium alloy stamping process
CN103586354B (en) * 2013-12-02 2015-12-30 中国兵器工业第五九研究所 A kind of lubricating method of multistation hot-forming die
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CN105170765A (en) * 2015-10-29 2015-12-23 无锡桥阳机械制造有限公司 Magnesium alloy machining process
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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
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CN109834181B (en) * 2017-11-24 2020-10-23 比亚迪股份有限公司 Hot-press forming device and hot-press forming method for magnesium alloy plate, magnesium alloy plate and application of magnesium alloy plate
CN108543849B (en) * 2018-04-26 2021-04-09 沈阳航空航天大学 Forming method and equipment of magnesium alloy box-shaped part
CN110000321B (en) * 2019-04-22 2020-05-22 福建省石狮市通达电器有限公司 Forging and pressing forming process of aluminum alloy mobile phone shell

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