CN102159339A - Pressed body - Google Patents
Pressed body Download PDFInfo
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- CN102159339A CN102159339A CN2009801368145A CN200980136814A CN102159339A CN 102159339 A CN102159339 A CN 102159339A CN 2009801368145 A CN2009801368145 A CN 2009801368145A CN 200980136814 A CN200980136814 A CN 200980136814A CN 102159339 A CN102159339 A CN 102159339A
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- stampings
- bight
- thickness
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- angle radius
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/02—Stamping using rigid devices or tools
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D51/00—Making hollow objects
- B21D51/16—Making hollow objects characterised by the use of the objects
- B21D51/18—Making hollow objects characterised by the use of the objects vessels, e.g. tubs, vats, tanks, sinks, or the like
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/20—Deep-drawing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D51/00—Making hollow objects
- B21D51/16—Making hollow objects characterised by the use of the objects
- B21D51/52—Making hollow objects characterised by the use of the objects boxes, cigarette cases, or the like
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12382—Defined configuration of both thickness and nonthickness surface or angle therebetween [e.g., rounded corners, etc.]
Abstract
Provided is a pressed body (F) which is formed by pressing a metal plate (1). The pressed body (F) has a corner section (12) which connects two surfaces among the outer peripheral surfaces constituting the pressed body (F), and the corner section (12) is sharp with an outer bending radius (R) equivalent to the thickness (t) of the metal plate (1) or less.
Description
Technical field
The present invention relates to a kind of stampings that for example are used for the housing of portable electric appts, relate in particular to a kind of stampings with sharp corner.
Background technology
Will be such as the metal of aluminium or its alloy as the material that be used for such as the housing of the portable electric appts of cell phone and notebook-PC etc.Usually, compare with resin, metal has higher intensity and more shock-resistant.
As the above-mentioned material that is used for housing, used by add the magnesium alloy that various elements form to magnesium.Although magnesium alloy has excellent specific strength and specific stiffness, because it has hexagonal crystal structure (hexagon close packed structure), so it has poor plastic working at normal temperatures.Thus, this housing etc. mainly is by using the casting product by die casting process or fusion-casting process manufacturing to form.In recent years, the engineer is studying magnesium alloy is being carried out press process (patent documentation 1 and 2).
Summary of the invention
Technical problem
The common shape of housing is to be provided with rectangular-shaped top plate and the box of four sidewalls forming from the edge of top board.For the box formed body, the market expectation obtains a kind of like this housing: promptly, all have certain acutance at the place, bight that top board is linked to each other with sidewall with the place, bight that two sidewalls are linked to each other.Possible is when using resin injection moulding or casting, can form the housing with sharp corner.Yet resin product and casting product have the intensity lower than metal crimp goods usually.
When the box formed body fell and bump against ground etc., the impact during collision was all acting on above-mentioned bight in a lot of situations.Thus, in having low intensive resin product and casting product, the bight deforms (breaking) or otherwise damage, thereby this bight is difficult to the state that keeps sharp keen.
The solution of problem
In view of said circumstances has been made the present invention, and the invention provides and a kind ofly have sharp corner and have high-intensity formed body.More specifically, the invention provides a kind of stampings by pressing metal plates is shaped and makes.These stampings have outer surface, and this outer surface has the bight that two surfaces in the outer surface are linked to each other.This bight has the lateral angle radius R, and this lateral angle radius is smaller or equal to the thickness t of metallic plate.
According to said structure, by metallic plate is carried out press forming, the hardness in bight increases by the work hardening that produces owing to plastic working.Thus, even when percussion during in the bight etc., distortion also takes place not too easily, thereby sharp corner can be maintained for a long time.In addition, because the press forming of stampings of the present invention by metallic plate forms,, make whole stampings have high strength so except the intensity of material itself, can also gain in strength by plastic working.In addition, because stampings of the present invention have aforementioned sharp corner,, it gives the impression of fashion so relying on refining design.Thus, expect that these stampings have excellent outward appearance as commodity, and therefore have the commercial value of raising.
For example, above-mentioned stampings with sharp corner of the present invention can be made by the slab that is made of metal being carried out following multistage press process.More specifically, this manufacture method will be made the stampings with bight by metallic plate is carried out press process, and this manufacture method has the following step:
The step of preparation slab: the slab that this step preparation is made of metal.
First pressing step: in the state of this slab of heating more than or equal to 200 ℃ but under smaller or equal to 300 ℃ temperature, this step produces following pressed material, and this pressed material has at least one bight that two surfaces in the outer surface are linked to each other.Especially, carry out first press process, make and to have shoulder can make the stamping machine of (its angular radius Rp actual be 0mm) at least one bight have reality and be the medial angle radius r of 0mm by using.
Second pressing step: by under the situation of the aforementioned pressed material of heating more than or equal to 200 ℃ but under, carrying out second press process smaller or equal to 300 ℃ temperature, this step produces the stampings with at least one bight, and this bight has the lateral angle radius R smaller or equal to the thickness t of metallic plate.Especially, carry out second press process, make bight by using rank shape stamping machine to suppress the end face of described pressed material and formed and had actual medial angle radius r as 0mm in first pressing step on inner surface, above-mentioned bight with medial angle radius r of the actual 0mm of being can have the lateral angle radius R smaller or equal to aforementioned thicknesses t.
When slab to be pressed has the minimal thickness of possibility, can easily form the sharp corner that has smaller or equal to the lateral angle radius R of the thickness t of metallic plate.Yet when slab itself was thin excessively, the intensity of stampings reduced, thereby it can not satisfy the required strength and stiffness of housing of portable electric appts.On the other hand, for the hardness in the bight of when falling, being impacted easily that increases stampings by work hardening, it is contemplated that with height processing ratio to form the bight.Yet when carrying out bending or deep draw with height processing ratio, the bight shaping in the slab is prolonged by the part, thereby has reduced its thickness.This thickness reduces to cause the reduction of intensity.
Consider aforementioned phenomenon, above-mentioned manufacture method is by being divided into this process aforesaid a plurality of stage, rather than comes to carry out press forming with height processing ratio by the process in a stage.Thus, prevent that the bight from becoming too thin, thereby can suppress because the intensity that thickness reduces to cause reduces.Thus, above-mentioned manufacture method can not only be made the stampings with sharp corner, and can keep described sharp corner for a long time.
In addition, above-mentioned manufacture method is carried out press process under heated condition.Thus, even the metal (magnesium alloy that for example has about 20% percentage elongation at normal temperatures at the most) that has poor plastic working and therefore in cold working, produce resilience, break etc., when compacting, also the percentage elongation of object to be processed (slab and pressed material) can be increased to 100% or more than.In addition, because object to be processed has enough percentage elongations, so can have stampings with the high accuracy manufacturing with the bight of minimum lateral angle radius R.
Advantageous effects of the present invention
Stampings of the present invention have sharp corner and high strength.
According to above-mentioned manufacture method, the bight that forms on outer surface (promptly forming the bight of outward appearance) is sharp keen.In addition, the bight that forms on inner surface also is sharp keen.Thus, stampings have broad inner space.Thus, when the stampings that obtain by aforementioned manufacture method were used for housing, various parts can be contained in this housing fully.
Description of drawings
Fig. 1 is used for illustrating the schematic sectional elevation of program that has process, the press process of the stampings of sharp corner in manufacturing.(A) part of Fig. 1 has shown that slab places the state of mould.(B) part of Fig. 1 has shown the state that forms pressed material by first press process.(C) part of Fig. 1 has shown that stamping machine is carried out the state of suppressing in second press process.Fig. 1 (C ') partly be the partial enlarged view in the bight of demonstration in (C) part.(D) part of Fig. 1 has shown the state that forms the stampings with sharp corner by second press process.(E) part of Fig. 1 has shown the stampings that obtained.
The specific embodiment
Hereinafter will describe embodiments of the invention.In the description of the drawings, identical parts indicate identical mark to avoid repeat specification.The ratio of the size in the accompanying drawing needn't with the explanation consistent.
Stampings
Form
Can be by using more than or equal to 200 ℃ but the various metals that have excellent press formability in smaller or equal to 300 ℃ temperature range form stampings of the present invention.Especially, because magnesium and alloy thereof be lightweight, have high strength and an excellent in impact resistance, so expectation uses magnesium or its alloy to be used as being used to form for example to need the case material of the portable electric appts with light weight.
Can use by in Mg, adding the magnesium alloy that various elements (remainder: Mg and impurity) form with various compositions.The type of magnesium alloy comprises Mg-Al base alloy, Mg-Zn base alloy, the basic alloy of Mg-RE (rare earth element) and the alloy that is added with Y.Especially, the Mg-Al base alloy that contains Al has high corrosion resistance.As appointment in the standard of ASTM (ASTM), the type of Mg-Al base alloy comprises AZ family alloy (Mg-Al-Zn base alloy, Zn: mass percent is 0.2% to 1.5%), AM family alloy (Mg-Al-Mn base alloy, Mn: mass percent is 0.15% to 0.5%), AS family alloy (Mg-Al-Si base alloy, Si: mass percent is 0.6% to 1.4%) and the basic alloy of Mg-Al-RE (rare earth element).What expect is that by mass percentage, the content of Al is 1.0% to maximum 11%.Especially, with other Mg-Al base alloy phase ratio such as AZ31 alloy etc., the Mg-Al base alloy of being represented by the AZ91 alloy has excellent corrosion resistance and mechanical performance (for example intensity and anti-plastic deformation), by mass percentage, it contains 8.3% to 9.5% Al and 0.5% to 1.5% Zn.As appointment in the ASTM standard, the type that contains the Mg-Zn base alloy of Zn comprises ZK family alloy (Mg-Zn-Zr base alloy, by mass percentage, Zn:3.5% to 6.2% is more than the Zn:0.45%).
Shape
Stampings of the present invention form by the press process that metallic plate is carried out such as crooked and deep draw.In stampings, outer surface has at least one bight that two surfaces in this outer surface are linked to each other.The side wall portion that the stampings of typical shape have top plate portion (bottom surface sections) and form from the edge of top plate portion.More specifically, the type of this shape comprise top plate portion with rectangular plate shape and only a pair of opposing sidewalls portion box-like body, have the box-like body of two pairs of opposing sidewalls portions and have the top plate portion of circular plate shape and hollow-cylindrical lateral wall portion cover hollow circular cylinder.Top plate portion and side wall portion respectively have outer surface in fact parallel to each other and inner surface.In stampings of the present invention, the bight that two outer surfaces are linked to each other is sharp keen.
Common above-mentioned top plate portion and side wall portion all form flat surfaces; Their shape and size are not particularly limited.They can have lug boss of integrally formed or combination etc.They can have from outer surface and extend through the through hole of inner surface or along the recessed groove of thickness direction.They can have stairstepping.They can have the different part of local thickness, and this part forms by plastic working or cutting.Have lug boss, recess and the thickness different piece except above-mentioned, the part beyond the bight has almost homogeneous thickness.Therefore, the thickness t that forms the metallic plate of stampings is defined as average thickness except the entire portion aforementioned lug boss etc. and the bight.More specifically, from except such as selecting five or more a plurality of measurement point to obtain mean value the part the above-mentioned part of lug boss etc.When top plate portion was formed by flat surfaces, aforementioned thicknesses t can be the average thickness of whole top plate portion.Thickness t depends primarily on the thickness of slab.In the situation of plate without undergoing press process, the thickness t in fact thickness with slab is identical.
Have more than or equal to 0.4mm when above-mentioned metallic plate but during smaller or equal to the thickness t of 2.0mm, obtained to have the stampings of excellent in strength.When thickness during less than 0.4mm, because slab is thinner, so form stampings easily with less lateral angle radius R.Thus, the stampings of very excellent outward appearance (for example stylishness) have been obtained to have.Below metallic plate has 2.0mm, particularly below the 1.5mm, more especially during the thickness t below the 0.6mm, expect that stampings of the present invention can be suitable for for example housing of portable electric appts.
The notable attribute of stampings of the present invention is, in outer surface, at least one bight that two surfaces in the outer surface are linked to each other has the lateral angle radius R smaller or equal to t.Traditional stampings of being made by metallic plate have the lateral angle radius bigger than the thickness of metallic plate; Traditionally, still do not have stampings and satisfy following condition: R is smaller or equal to t.By contrast, this condition is satisfied at least one bight of stampings of the present invention: R is smaller or equal to t.All satisfying this condition when all bights that exist in the stampings of the present invention is R during smaller or equal to t, and expection can further strengthen fashion.
Especially, when the lateral angle radius R satisfied condition " R≤(2/3) * t ", the bight can easily have higher hardness than the part such as top plate portion except this bight, makes the bight can have the resistance to impact of raising.When satisfying condition " R≤(1/2) * t ", can further improve the resistance to impact and the fashion in bight.More specifically, expectation is that the lateral angle radius R is 0.1 to 0.3mm.When the lateral angle radius R is 0.1mm or when above, can reduce the possibility of being cut or destroying by sharp corner.When R is 0.3mm or when following, the bight can have excellent in impact resistance, obtains good surface appearance simultaneously.For example can realize reducing of lateral angle radius R by the pressing pressure that increases in second pressing step.
In the stampings that obtain by above-mentioned manufacture method, at the place, bight of satisfy condition " R is smaller or equal to t ", the actual 0mm that becomes of medial angle radius r.In other words, in inner surface, in fact two surfaces that are positioned at inboard, above-mentioned bight are perpendicular to one another.Compare with the stampings that have greater than zero medial angle radius r, such stampings have broader inner space, therefore can be suitable for holding the housing of various parts.
Manufacture method
The preparation of slab
When using magnesium alloy to form slab, the milled sheet of making by rolling cast sheet is repeatedly used in expectation, and described cast sheet is by the continuous casting process such as two operations of rolling, the casting process of particularly setting forth in WO/2006/003899 and making.Because the continuous casting process can realize rapid solidification, thus the generation of oxide and segregation can be reduced, thus obtain to have the cast sheet of excellent rolling processability.When cast sheet through heat-treated, when for example solution treatment (heating-up temperature: 380 ℃ to 420 ℃, heat time heating time: 60 to 600 minutes) or burin-in process, composition is homogenized.Especially, in the situation of the high magnesium alloy of Al content, solution treatment is carried out in expectation for a long time.The size of cast sheet is not particularly limited.Yet,, tend to produce segregation if plate is blocked up.Therefore, expect that this thickness is 10mm or following, 5mm or following particularly.
When above-mentioned cast sheet is carried out repeatedly rolling operation, can obtain the plate thickness of expectation and can reduce average grain size.In addition,, can eliminate defective for the high magnesium alloy of Al content (for example AZ91 alloy), for example thick impurity in the crystal and slightly precipitated impurities, thus can improve press processability.Rolling operation can be by combining and carry out with known condition (for example, in the situation of magnesium alloy, disclosed controlled rolling in the patent documentation 2).In process, carry out intermediate heat-treatment (heating-up temperature: 250 ℃ to 350 ℃ in rolling operation, heat time heating time: 20 to 60 minutes) removes or reduced before intermediate heat-treatment when being incorporated into strain in the object to be processed, residual stress, set tissue etc., can come to carry out more reposefully follow-up rolling operation by preventing cracking, strain and distortion owing to processing.The milled sheet that is obtained can be experienced 300 ℃ or above heat treatment, to remove the processing strain that causes owing to rolling operation and to realize recrystallization completely.Alternately, the milled sheet that is obtained can obtain strain by using the roll-type press to wait under heated condition, to be recrystallized during press process.
Press process
Be desirably in each stage, more than or equal to 200 ℃ but carry out press process in a plurality of stages in smaller or equal to 300 ℃ temperature range, to improve the plastic working of object to be processed (slab and pressed material).
In first press process, it is zero no better than (ideally that use has angular radius Rp, this angular radius Rp is 0.3mm or following) the stamping machine of shoulder form and have sharp corner the pressed material of (actual be right angle) at inboard place, the pressed material that promptly has inner surface, in this pressed material, the bight is formed by two surfaces that are perpendicular to one another.In second press process, utilize rank shape stamping machine to suppress the end face and the aforementioned inboard bight of described pressed material.Thereby the constituent material of slab is forced to accumulate in the place, bight of mould, and this constituent material that is forced to assemble is out of shape as follows: promptly form sharp corner in the outside of pressed material.When press process, used suitable mould, for example removable mould or concavity mould.
After press forming, can heat-treat, so that remove strain and the residual stress that imports by press process and improve mechanical performance.The example of heat-treat condition is as follows: heating-up temperature: 100 ℃ to 450 ℃; Heat time heating time: about 5 minutes to 40 hours.When the stampings that obtain by press process are provided with that purpose is anticorrosion, protection and during the cover layer decorated, can further improve corrosion resistance and commercial value etc.
Test example 1
Make a plurality of stampings of making by magnesium alloy respectively and having a bight and check the lateral angle radius R in bight and the hardness of stampings.
Prepare a plurality of cast sheet (thickness: 4mm), described cast sheet is by having the composition (Mg suitable with the composition of AZ91 alloy, mass percent is that 9.0% Al and mass percent are 1.0% Zn) magnesium alloy make, and make by two rolling continuous casting processes." rolling temperature: 150 ℃ to 250 ℃ under following rolling condition; Plate temperature: 200 ℃ to 400 ℃; Each rolling reduction: 10% to 50% ", make the cast sheet that is obtained stand repeatedly rolling operation, be reduced to 0.6mm until thickness.The sheet material that is obtained stands stamping-out is used for press forming with preparation slab.
The press process in prepared slab two stages of experience.Fig. 1 is the schematic sectional elevation that is used to illustrate the program of press process.Fig. 1 has shown this slab by emphasizing slab.
First press process produces pressed material P (box-like body with external dimensions of 45 * 95 * 6mm), and this pressed material P has as (B) of Fig. 1 and (C) the smooth top plate portion 10 shown in the part and from two pairs of flattened side walls portions 11 of top plate portion 10 formation.More specifically, shown in (A) part of Fig. 1, the slab B that will have the thickness t of 0.6mm places on plate 51 and the Die and mould plate 52, and stamping machine 53 and fixed head 54 are placed on the slab B.Then, under slab B was clipped in situation between plate 51 and the stamping machine 53, stamping machine 53 moved down in Fig. 1 to form pressed material.Stamping machine 53 has that angular radius Rp is actual to be the shoulder of 0mm, and two surfaces that form shoulder are perpendicular to one another.In the pressed material P that produces by this press process, the bight 12 that the outer surface 11o of the outer surface 10o of top plate portion 10 and side wall portion 11 is linked to each other has the thickness t than top plate portion 10
0Big lateral angle radius R
0In addition, the inner surface 11i of the inner surface 10i of top plate portion 10 and side wall portion 11 is perpendicular to one another.In other words, the medial angle radius r in bight 12
0Reality is 0mm.In description above, plate 51, Die and mould plate 52, stamping machine 53, fixed head 54 and stepwise stamping machine 55 described below and mould 56 can both utilize unshowned heater to be heated.In first press process, heating-up temperature be 200 ℃ or more than.
For example, as (C) of Fig. 1 with (D) shown in the part, the mould 56 that second press process is used protruding type stepwise stamping machine 55 and had a concavity portion is suppressed the end face 11e of the side wall portion 11 of pressed material P.This pressing operation has produced stampings F, and these stampings F has sharp corner, and the lateral angle radius R of this sharp corner is smaller or equal to the thickness t of metallic plate 1.Stepwise stamping machine 55 has end press face 55p and shoulder 55s, and this shoulder 55s forms with rectangular inboard bight 12i almost at the inner surface place of pressed material P and contacts, to suppress inboard bight 12i.In the concavity portion of mould 56, bottom surface 56b and side 56s are perpendicular to one another, thereby this bight is the right angle.
Shown in Fig. 1 (C) and (C ') part, pressed material P is being placed under the situation about having with the mould 56 of the concavity portion of the outline coupling of box-shaped pressed material P, utilize the inside of the described pressed material P of stepwise stamping machine 55 compactings.At this moment, the end press face 55p of stepwise stamping machine 55 at first suppresses the end face 11e of side wall portion 11.Then, when stepwise stamping machine 55 continued compacting downwards, the main press face 55m of stepwise stamping machine 55 formed with the inner surface 10i of top plate portion 10 and contacts to suppress this inner surface 10i.When the shoulder 55s that utilizes stepwise stamping machine 55 suppressed the inboard bight 12i of described pressed material P, the constituent material in the part of the part of side wall portion 11 and top plate portion 10 all was forced to accumulate in the place, bight of the concavity portion of mould 56.Thus, according to the bight of concavity portion, in pressed material P, form sharp corner.In description above, for the even compacting of the end face 11e that promotes oppose side wall portion 11, the part of the side wall portion of the pressed material that obtained by first press process is processed by the side cutting, make pressed material have the evenly side wall portion of height of 5.5mm.In this case, carry out second press process.In second press process, the pressure when suppressing by changing changes the size of lateral angle radius R.
By said process, shown in Fig. 1 (E) part, can obtain stampings F, in these stampings F, the bight 22 that the outer surface 21o of the outer surface 20o of top plate portion 20 and side wall portion 21 is linked to each other has the lateral angle radius R smaller or equal to the thickness t of top plate portion 20.When using point micrometer to measure the thickness of top plate portion 20 and side wall portion 21, this thickness is 0.6mm, no better than the thickness of slab B.
The stampings that obtained are carried out the measurement of the hardness of the hardness in lateral angle radius R, bight and top plate portion.The result shows in Table I.
Measure lateral angle radius R (mm) by the following method.At first, on direction, stampings are cut perpendicular to the crestal line between the outer surface of the outer surface of top plate portion and side wall portion.Grinding and polishing (using diamond abrasive grain No.200) is carried out in the cutting face, observe down at light microscope (400 times) then.Use viewed image to measure radius.Similarly, measure the medial angle radius r (mm) in bight.The result shows that this radius is actual to be 0mm, and in fact the inner surface of the inner surface of top plate portion and side wall portion is perpendicular to one another.
Measure the hardness Hv in bight by the following method.At first, on direction, stampings are cut perpendicular to the crestal line between the outer surface of the outer surface of top plate portion and side wall portion.Use the cutting blade that is obtained to make embedded sample.Mirror finish is carried out in the cutting face.In the cutting face of stampings, slave plate along selecting three measurement points in the central part of thickness direction.Use micro Vickers to measure the hardness of each measurement point.The mean value of three measured values shows in Table I.
Measure the hardness Hv of top plate portion by the following method.At first, the part of top plate portion is downcut from stampings.Use the cutting blade that is obtained to make embedded sample.Mirror finish is carried out in the cutting face.In the cutting face of stampings, slave plate along selecting three measurement points in the central part of thickness direction.Use micro Vickers to measure the hardness of each measurement point.The mean value of three measured values shows in Table I.Alternately, hardness Hv also can not only comprise the bight but also comprise that the embedded sample of top plate portion measures by making.
[Table I]
From Table I, can see, carry out above-mentioned multistage hot pressing processing and can produce the satisfy condition stampings of " R is smaller or equal to thickness t " of its lateral angle radius R with high accuracy.Especially, when metallic plate was carried out above-mentioned press process, bight and top plate portion had suitable hardness.Thus because these stampings have high-intensity bight, so expect they in experience such as unlikely being out of shape owing to falling the impact that produces.
Table I has also shown: when the lateral angle radius R satisfied condition " R is smaller or equal to (2/3) * t ", the hardness in bight increased.Its reason is attributable to the work hardening that is caused by the multistage press process.In addition, when the lateral angle radius R satisfied condition " R is smaller or equal to (1/2) * t ", the hardness in bight obviously increased.Expectable is that the bight of these stampings is very excellent aspect resistance to impact, and therefore can keep sharp keen state for a long time.
In above-mentioned test example 1, be illustrated at following situation: promptly, in the box formed body with two oppose side wall portions, the bight that top plate portion is linked to each other with side wall portion has the lateral angle radius R of satisfy condition " R is smaller or equal to t ".Similarly, can also make such stampings, promptly in these stampings, the bight that connects side wall portion has the lateral angle radius R of satisfy condition " R is smaller or equal to t ".Also can produce the stampings that only have pair of sidewalls portion.In addition, in above-mentioned test example 1, by providing explanation with reference to integrally formed stepwise stamping machine.Yet, also can use by making up the stepwise stamping machine that a plurality of cutting plates form.For example, also can use following stepwise stamping machine: another cutting plate that its part that is provided with the end face that is mainly used in the cutting plate that top plate portion is suppressed and is used for oppose side wall portion and top plate portion is suppressed.
Test example 2
Preparation has the slab of all thickness and makes the stampings of being made by magnesium alloy.Check the intensity and the outward appearance of the stampings of manufacturing.
Preparation and the identical cast sheet (thickness: 4mm) of type that in test example 1, prepares.Prepared cast sheet has the composition suitable with the composition of AZ91 alloy and stands rolling operation by changing rolling number of times, has all thickness (thickness: milled sheet 0.3 to 0.8mm) with manufacturing.As test example 1, the milled sheet that is obtained stands stamping-out with the preparation slab.As test example 1, the hot pressing processing in each slab two stages of experience (heating-up temperature when in 200 ℃ to 250 ℃ scope, suitably selecting compacting).Thereby, make and respectively to have smooth top plate portion and from the stampings of two pairs of flattened side walls portions that this top plate portion forms.
Measure the lateral angle radius R (mm) in the bight of each stampings that obtained by the method identical with the method for use in the test example 1.The result shows in Table II.
In addition, measure the intensity of stampings as described below.Stampings are placed as make the top plate portion of stampings be directed upwards towards, and side wall portion is as supporting member.Under this state, the sintered carbide ball that will have a 38mm diameter is pushed down into the center of top plate portion in the load of 1kgf (9.8N), so that this stampings permanent deformation.Utilize the contact talysurf to measure deflection (ledge in the outer surface of top plate portion and the size between the recess poor).This deflection is assessed as the intensity of stampings.When deflection is 1mm or more for a long time, think these stampings undercapacity and be assessed as " poor ".When deflection during, think that these stampings have enough intensity and are assessed as " very " less than 1mm.When deflection during, think that these stampings have excellent intensity and are assessed as " excellent " less than 0.3mm.The result shows in Table II.
Come outward appearance is assessed by the panel test that is undertaken by the 10 people groups of selecting at random.When five or still less personnel of group judge that these stampings have sharp keen and unique bight, the outside, fashion and excellent designability, these stampings are evaluated as " poor ".When six to eight personnel of group make above-mentioned judgement, these stampings are evaluated as " very ".When nine or more a plurality of personnel of group make above-mentioned judgement, these stampings are evaluated as " excellent ".The result shows in Table II.
[Table II]
Attention: the assessment chump in working strength assessment and the outward appearance assessment is as overall evaluation.
Can see that from Table II along with the thickness t increase of top plate portion, intensity also increases.In addition, when lateral angle radius R during smaller or equal to (1/2) * t, intensity height and outward appearance excellence.
In the case without departing from the gist of the present invention, but appropriate change the foregoing description, and the foregoing description is not limited to above-described structure.For example, the material of metallic plate can become aluminium, aluminium alloy and other various metals from magnesium alloy.
Industrial applicibility
Stampings of the present invention can be applicable to various electronic equipments, and special shi is used for the housing of portable electric appts etc.
Reference numerals list
1: metallic plate
: top plate portion; 10o: the outer surface of top plate portion; 10i: the inner surface of top plate portion;
: side wall portion; 11o: the outer surface of side wall portion; 11i: the inner surface of side wall portion; 11e: the end face of side wall portion;
12: the bight; 12i: inboard bight;
20: top plate portion; 20o: the outer surface of top plate portion; 21: side wall portion; 21o: the outer surface of side wall portion; 22: the bight;
51: plate; 52: Die and mould plate; 53: stamping machine; 54: fixed head; 55: the stepwise stamping machine; 55m: main press face; 55p: end press face; 55s: shoulder; 56: mould; 56b: bottom surface; 56s: side
B: slab; P: pressed material; F: stampings
Reference listing
Patent documentation
Patent documentation 1: the Japanese Patent Application Laid-Open 2002-239644 that has announced
Patent documentation 2: the Japanese Patent Application Laid-Open 2007-098470 that has announced
Claims (9)
1. stampings, described stampings are made by pressing metal plates is shaped;
Described stampings have outer surface, and described outer surface has the bight that two surfaces in the described outer surface are linked to each other;
Described bight has lateral angle radius (R), and described lateral angle radius (R) is smaller or equal to the thickness (t) of described metallic plate.
2. stampings as claimed in claim 1, wherein, described lateral angle radius (R) satisfies following condition: described lateral angle radius (R)≤(2/3) * described thickness (t).
3. stampings as claimed in claim 2, wherein, described lateral angle radius (R) satisfies following condition: described lateral angle radius (R)≤(1/2) * described thickness (t).
4. as each the described stampings in the claim 1 to 3, wherein, the hardness height of the part beyond the described bight of the hardness ratio in described bight.
5. as each the described stampings in the claim 1 to 4, wherein, described bight has the actual medial angle radius (r) of 0mm that is.
6. as each the described stampings in the claim 1 to 5, wherein, described stampings are made by magnesium alloy.
7. as each the described stampings in the claim 1 to 5, wherein, described stampings are made by magnesium alloy, and described magnesium alloy contains Al or Zn or contains Al and Zn simultaneously.
8. stampings as claimed in claim 7, wherein, by mass percentage, described magnesium alloy comprises: more than or equal to 8.3% but smaller or equal to 9.5% Al, more than or equal to 0.5% but smaller or equal to 1.5% Zn and as the Mg and the impurity of remainder.
9. as each the described stampings in the claim 1 to 8, wherein
(a) described lateral angle radius (R) is more than or equal to 0.1mm but smaller or equal to 0.3mm; And
(b) described thickness (t) is more than or equal to 0.4mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510941099.XA CN105537350A (en) | 2008-09-18 | 2009-07-16 | Pressed product and press working method |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008239712A JP2010069504A (en) | 2008-09-18 | 2008-09-18 | Pressed body |
| JP2008-239712 | 2008-09-18 | ||
| PCT/JP2009/062855 WO2010032545A1 (en) | 2008-09-18 | 2009-07-16 | Pressed body |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510941099.XA Division CN105537350A (en) | 2008-09-18 | 2009-07-16 | Pressed product and press working method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102159339A true CN102159339A (en) | 2011-08-17 |
Family
ID=42039387
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009801368145A Pending CN102159339A (en) | 2008-09-18 | 2009-07-16 | Pressed body |
| CN201510941099.XA Pending CN105537350A (en) | 2008-09-18 | 2009-07-16 | Pressed product and press working method |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510941099.XA Pending CN105537350A (en) | 2008-09-18 | 2009-07-16 | Pressed product and press working method |
Country Status (10)
| Country | Link |
|---|---|
| US (2) | US20110165431A1 (en) |
| EP (1) | EP2329897B1 (en) |
| JP (1) | JP2010069504A (en) |
| KR (2) | KR20110069007A (en) |
| CN (2) | CN102159339A (en) |
| AU (1) | AU2009293983A1 (en) |
| BR (1) | BRPI0917892A2 (en) |
| RU (1) | RU2497624C2 (en) |
| TW (1) | TW201014661A (en) |
| WO (1) | WO2010032545A1 (en) |
Cited By (3)
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| CN102553982A (en) * | 2011-12-27 | 2012-07-11 | 苏州三维精密机械有限公司 | Small-fillet high-strength thick plate bending technology |
| CN104136142A (en) * | 2011-12-22 | 2014-11-05 | 新日铁住金株式会社 | Press-formed product |
| CN105537350A (en) * | 2008-09-18 | 2016-05-04 | 住友电气工业株式会社 | Pressed product and press working method |
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| ES2577077T3 (en) * | 2011-07-21 | 2016-07-12 | Kabushiki Kaisha Kobe Seiko Sho | Method for producing a hot pressure molded steel element |
| US8935561B2 (en) * | 2012-02-23 | 2015-01-13 | City University Of Hong Kong | Progressive network recovery |
| JP6019960B2 (en) * | 2012-09-07 | 2016-11-02 | 住友電気工業株式会社 | Metal molded body and method for producing metal molded body |
| JP6029085B2 (en) * | 2012-09-26 | 2016-11-24 | 住友電気工業株式会社 | Metal molded body and method for producing metal molded body |
| GB201217221D0 (en) | 2012-09-26 | 2012-11-07 | Jaguar Cars | Panel bending method |
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| EP2727665B1 (en) * | 2012-10-31 | 2018-06-06 | Airbus Defence and Space GmbH | Method for making a moulded part and use of the method for making a moulded part |
| US9452461B2 (en) * | 2013-01-09 | 2016-09-27 | Nippon Steel & Sumitomo Metal Corporation | Press forming method |
| DE102013103751A1 (en) | 2013-04-15 | 2014-10-16 | Thyssenkrupp Steel Europe Ag | Process for the production of high-volume half-shells and apparatus for producing a half-shell |
| DE102016118418A1 (en) * | 2016-09-29 | 2018-03-29 | Thyssenkrupp Ag | Method for producing a molded component with a dimensionally stable frame area |
| KR101892469B1 (en) * | 2016-12-05 | 2018-08-28 | 경일산업 주식회사 | Forming procedure for aluminum case using press die and mold apparatus being used that |
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- 2009-07-16 BR BRPI0917892A patent/BRPI0917892A2/en not_active IP Right Cessation
- 2009-07-16 AU AU2009293983A patent/AU2009293983A1/en not_active Abandoned
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Also Published As
| Publication number | Publication date |
|---|---|
| CN105537350A (en) | 2016-05-04 |
| EP2329897B1 (en) | 2013-01-09 |
| EP2329897A1 (en) | 2011-06-08 |
| JP2010069504A (en) | 2010-04-02 |
| BRPI0917892A2 (en) | 2015-12-01 |
| EP2329897A4 (en) | 2012-03-07 |
| KR20160020585A (en) | 2016-02-23 |
| WO2010032545A1 (en) | 2010-03-25 |
| TW201014661A (en) | 2010-04-16 |
| KR20110069007A (en) | 2011-06-22 |
| AU2009293983A1 (en) | 2010-03-25 |
| US20110165431A1 (en) | 2011-07-07 |
| US20130104619A1 (en) | 2013-05-02 |
| RU2497624C2 (en) | 2013-11-10 |
| RU2011114987A (en) | 2012-10-27 |
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Application publication date: 20110817 |