WO2008068947A1 - 鋳造方法、上鋳型組立体、および上鋳型に対する中子の固定方法 - Google Patents
鋳造方法、上鋳型組立体、および上鋳型に対する中子の固定方法 Download PDFInfo
- Publication number
- WO2008068947A1 WO2008068947A1 PCT/JP2007/068855 JP2007068855W WO2008068947A1 WO 2008068947 A1 WO2008068947 A1 WO 2008068947A1 JP 2007068855 W JP2007068855 W JP 2007068855W WO 2008068947 A1 WO2008068947 A1 WO 2008068947A1
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- WIPO (PCT)
- Prior art keywords
- core
- saddle type
- upper saddle
- mold
- fitting
- Prior art date
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D23/00—Casting processes not provided for in groups B22D1/00 - B22D21/00
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D18/00—Pressure casting; Vacuum casting
- B22D18/02—Pressure casting making use of mechanical pressure devices, e.g. cast-forging
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C21/00—Flasks; Accessories therefor
- B22C21/12—Accessories
- B22C21/14—Accessories for reinforcing or securing moulding materials or cores, e.g. gaggers, chaplets, pins, bars
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/10—Cores; Manufacture or installation of cores
- B22C9/108—Installation of cores
Definitions
- the present invention relates to a method for manufacturing a forged product (ie, a forging method), an upper saddle type assembly used in this method, and a method for fixing a core to the upper saddle type. More specifically, the present invention relates to a method for forging a forged product by a sand mold press casting process in which an upper mold is overlaid on a lower mold in which a minimum amount of molten metal necessary for obtaining the fabricated product is injected. Is.
- a forging method called a sand-type press casting process has been proposed in order to improve the yield of porridge (see Patent Document 1).
- This method is (1) a mold formed by various mold making methods, which does not have the necessary cavity for achieving the fabrication method, but has only the necessary cavity for building the main body of the structure.
- Lower mold and (2) Mold made by various mold making methods, which do not have the necessary cavity to achieve the production plan, and cooperate with the lower mold This is a method of forging using the upper mold having a protruding part capable of defining the cavity for building the main body, and the amount of molten metal necessary for manufacturing only the main body is After pouring into the lower bowl type cavity, the upper bowl type protruding part is inserted into the poured molten metal so as to define the cavity necessary to manufacture only the main body. Then, the upper saddle mold is overlapped with the lower saddle mold.
- Patent Document 1 JP 2005-52871
- Patent Document 2 JP-A-9 57396
- the sand mold press casting process is a method that can produce a desired forged product with high! /, Molten metal yield, but when this method is used to forge a forged product, the core is lifted.
- the problem arises.
- a recess of the same shape is received so as to receive the core skirting board. It is common to install the receiving part in the lower bowl type, install the core in that place, insert it in the upper bowl type, and then pour hot water (see Patent Document 2), and has a baseboard The core is not lifted by the molten metal.
- the sand mold press casting process uses a method in which the upper iron mold is placed after pouring into the lower iron mold, if a core is installed in the lower iron mold before pouring, The buoyancy of the core causes the core to rise, resulting in a product shape defect. Therefore, in the sand mold press casting process, there is a problem that the core floats when pouring only if the core is placed in the lower mold as usual. Is indispensable.
- a lower collar mold having a recess corresponding to a part of a product contour shape of a forged product, a core supporting the lower collar mold, The following fabrication method is provided which is performed using the upper mold that defines the vertical cavity in cooperation with the above.
- the upper saddle type assembly is moved at a predetermined first speed, and the upper saddle type assembly is moved into the recess. Lowering to a predetermined height position just before contacting the surface of the molten metal, and changing the lowering speed of the upper saddle type assembly from the first speed to the predetermined second speed, Lowering the solid from the predetermined height position;
- the state information of the upper saddle type assembly is a pressure applied by the upper saddle type assembly to the molten metal and / or the lower saddle type in the recess, or The total descending distance of the upper saddle type assembly.
- an upper collar that includes an upper collar and a core fixed to the upper collar, and defines a bowl-shaped cavity in cooperation with the lower collar.
- a mold assembly is provided.
- the core is fixed to the upper saddle type by mechanical means.
- the core is fixed to the upper saddle type by an adhesive.
- the core is raised by a friction fitting relationship between a fitting protrusion provided on the core and a concave fitting portion provided on the upper saddle type. Fixed to a saddle shape. According to the upper saddle type assembly of the present invention, it is preferable that the core has an engagement relationship between the engagement protrusion provided on the core and the upper saddle type crushed sand.
- the upper saddle type assembly is formed by fixing a plurality of cores to the upper saddle type,
- a plurality of recesses corresponding to the number of cores can be provided in the lower mold, and a plurality of fabricated products can be manufactured simultaneously using a single set of upper and lower molds.
- the core-side fitting projection is press-fitted into the collar-side recessed fitting portion provided on the upper collar.
- the core-side fitting protrusion is continued until the information value associated with the press-fitting fitting reaches a predetermined information value. Press-fitting into the vertical recess.
- the core-side fitting protrusion is single or plural, and the single or plural saddle-sides that are fitted with the core-side fitting protrusion are fitted.
- the inner diameter of at least the inner region of the recessed portion is smaller than the outer diameter of the corresponding contact portion of the core-side fitting protrusion.
- the core is fixed to the upper saddle mold to form the upper saddle mold assembly, which is necessary for obtaining the forged product in the lower saddle mold recess.
- lower the upper plate assembly toward the lower plate and place the upper plate assembly on top of the lower plate Adopts a press control method that detects the status information of the vertical assembly, detects that the status information has reached the predetermined status information, and then stops the lowering of the upper vertical assembly and finishes the pressing process. Therefore, the time from the pouring process to the end of the pressing process can be minimized.
- the temperature of the molten metal in the saddle type cavity decreases and the temperature decreases. The pressing process can be finished before the degree distribution becomes non-uniform, thereby making it possible to make the forged metal structure uniform.
- FIG. 1 is a longitudinal sectional view schematically showing a forging device including a lower saddle mold 10 and an upper saddle mold assembly 20 according to an embodiment of the present invention.
- the lower mold 10 has a recess 12 corresponding to a part of the product contour shape of the manufactured product.
- This recess 12 defines a saddle type cavity when the upper saddle type 22 is superimposed on the lower vertical type 10.
- the upper saddle type assembly 20 is assembled by fixing the core 24 to the lower surface of the upper saddle type 22, the core 24 forms a protruding portion 26 of the upper saddle type assembly 20, and the protruding portion 26 is Define the product contour along with recesses 1 and 2.
- the upper saddle type 22 for making the upper saddle type assembly 20 by combining the upper saddle type 22 and the core 24.
- the core 24 can be fixed to the core by mechanical bonding, adhesive bonding, frictional bonding, or bonding by squeezing the m-shaped sand.
- bolts 28a and nuts 28b are used as mechanical coupling means.
- Bolts 28a are pre-installed in the core 24 so that the bolts 28a penetrate the upper collar 22 in the vertical direction, and the core 24 follows the lower surface of the upper collar 22 after completion.
- the upper mold 22 is formed.
- a nut 28b is screwed onto the tip of the bolt 28a to prevent the core from falling off the upper collar 22.
- the core 24 can be fixed along the lower surface of the upper collar 22 by passing the bolts 28a through the already molded upper collar 22.
- the mechanical coupling means not only bolts and nuts but also wires, wedges and the like can be used.
- FIG. 3 shows an example of bonding of the core 24A to the upper collar 22 with an adhesive.
- a plurality of protrusions 24a projecting from one surface of the core 24A are respectively inserted into a plurality of recessed fitting portions 22a provided on the lower surface side of the upper collar 22, and a concave fitting portion is interposed via an adhesive B.
- the protrusion 24a is joined to the inner surface of 22a.
- the type of adhesive B is not particularly limited, and may be either an inorganic adhesive or an organic adhesive. In this example, a fast-drying strong adhesive mainly composed of butyl acetate resin was used. When the weight of the core 24A is large, the bonding area may be increased, or the shape of the bonding surface may be arbitrarily selected to increase the bonding strength.
- FIG. 4 shows an example of coupling of the core 24B to the upper saddle mold 22 using frictional force.
- a plurality of protrusions 24b projecting from one surface of the core 24B are respectively inserted into a plurality of concave fitting portions 22b provided on the lower surface side of the upper collar 22.
- the protrusion 24b and the recessed fitting portion 22b have substantially the same shape and the same dimensions, and when the protrusion 24b is inserted into the recessed fitting portion 22b, the inner wall surface of the recessed fitting portion 22b is scraped and scraped off. The sand is clogged between the two, and friction is generated, and the friction force causes the projection 24b to be securely held in the recessed fitting portion 22b, so that the core 24B is fixed to the upper mold 22.
- FIG. 5 shows an example of coupling of the core 24C to the upper saddle mold 22 by using the sand sand.
- the core 24C having a plurality of protrusions 24c having a large diameter on the front end side is integrally formed with the upper mold 22 so that the protrusion 24c is embedded in the stuffed sand and the core 24C is Securely fixed to upper bowl 22
- the upper saddle mold assembly 20 shown in FIG. 1 is connected to the lifting means 32 and is moved up and down with respect to the lower saddle mold 10 while being guided by the guide rod 30 to the machine frame.
- the lifting / lowering means 32 may employ any means such as an electric type, a hydraulic type, and a pneumatic type.
- an electric servo system that can control the height position and the lifting speed of the upper saddle type assembly 20 with high accuracy. Used.
- This electric servo cylinder includes a screw mechanism, a drive motor, a rotary encoder as a position detector, and the like.
- the electric servo cylinder that can control the height position and the ascending / descending speed of the upper saddle type assembly instead of the electric servo cylinder that can control the height position and the ascending / descending speed of the upper saddle type assembly, the electric servo cylinder that can control the speed of the upper saddle type assembly and the position of the upper saddle type assembly are detected. Use a linear scale to control the height position.
- the minimum amount of molten metal necessary to obtain the main body is poured into the recess 12 of the lower mold 10 (Fig. 6).
- the amount of molten metal poured into the recess 12 is appropriately determined as necessary.
- the temperature of the molten metal poured is preferably 100 ° C higher than the liquidus temperature.
- the upper mold assembly 20 is quickly overlapped with the lower mold 10 and the molten metal in the recess 12 is pressed. Therefore, as shown in Fig. 7, the upper saddle type assembly 20 is moved at a predetermined first speed to contact the surface of the molten metal in the recess.
- the upper saddle type assembly is lowered at a high speed to the predetermined height position immediately before.
- the lowering speed is, for example, 375 mm / second, but is not limited to this value, and is set to a value within a speed range in which the entire apparatus does not shake due to the movement of the upper saddle type assembly 20.
- the appropriate range for the first speed (descent speed) is 300 to 1000 mm / sec.
- the height position immediately before the upper saddle type assembly 20 comes into contact with the surface of the molten metal in the recess is the upper vertical type 22 or
- the minimum distance to the core 24 is 1 to 100 mm.
- the appropriate range for the second speed is 1 to 100 mm / sec.
- the core 24 is fixed to the upper iron mold 22, so there is no possibility of floating in the molten metal.
- the upper saddle mold assembly 20 is lowered at a predetermined second speed, and the upper saddle mold assembly 20 is overlaid on the lower saddle mold 10 as shown in FIG.
- the state information of the upper saddle type assembly 20 that affects the condition is detected.
- the pressure applied to the lower saddle mold 10 by the upper saddle mold assembly 20 or the total descending distance of the upper saddle mold assembly can be used.
- the applied pressure can be detected by a load cell provided at the tip of the rod.
- the lowering of the upper saddle type assembly 20 is stopped.
- the applied pressure reaches lkPa
- the lowering of the upper plate type assembly 20 is stopped, and the state is maintained for the time necessary for the molten metal to completely solidify, and the forging is performed.
- forging is performed by lowering the upper collar mold assembly 20 in which the core 24 is fixed to the upper collar mold 22 toward the lower collar mold 10, so that the core 24 is It will not float up. Further, since the time for the core 24 to move in the molten metal can be minimized, the deformation of the core 24 due to the heat and pressure of the molten metal and the poor hot water due to the temperature change of the molten metal do not occur. For this reason, according to the present invention, forging by a sand mold press casting process using a core, forging can be performed without causing product shape defects.
- upper saddle-shaped assemblies can be made and stored in advance, and can be sequentially used during fabrication. Further, the state information of the upper saddle type assembly can be detected in a lowering process other than the state in which the upper saddle type assembly is superimposed on the lower saddle type. Furthermore, in some cases, it is also possible to prepare an upper saddle type assembly in parallel with or after the operation of pouring molten metal.
- the core 40 placed on the core support 58 of the core mounting device 50 is positioned so as to face the upper saddle mold 60 placed on the upper side thereof.
- the core 40 has a rod-like fitting projection 42 at the center of the top surface, and this rod-like fitting projection 42 is pushed into a recessed fitting portion 62 formed at the center of the lower surface of the upper collar 60 to provide a rod-like fitting. Due to the frictional fitting relationship between the mating protrusion 42 and the recessed fitting portion 62, the core 40 is attached and fixed to the upper collar 60.
- the core mounting device 50 is supported by a machine frame 90 supported by a base (not shown), a guide rod 52 disposed on the machine frame 90 so as to slide, and a lower part supported by the machine frame 90.
- the drive cylinder (pneumatic, hydraulic or electric) device 54 is fixed to the tip of the piston rod 56 of the drive cylinder device 54, which is coupled to the frame 100, the upper part of which is installed on the upper end of the guide rod 52.
- the core support 58 is used as a main member.
- the axis of the drive cylinder device 54 (and hence the axis of the piston rod 56) is aligned with the axis of the rod-like fitting protrusion 42 of the core 40, and these axes are also aligned with the axis of the upper saddle type 60 . Therefore, in the state shown in FIG. 10, when the drive cylinder device 54 is operated to raise the core 40, the rod-like fitting protrusion 42 of the core 40 enters the concave fitting portion 62 of the upper collar 60. become.
- FIG. 11 shows a state in which the raised core 40 is in close contact with the upper collar 60 and the rod-like fitting protrusion 42 has entered into the recessed fitting portion 62.
- each of the rod-like fitting protrusion 42 and the recessed fitting portion 62 has a frustoconical shape.
- the rod-like fitting protrusion 42 may have an equal-diameter round bar shape.
- the length of the rod-shaped fitting protrusion 42 is smaller than the depth of the recessed fitting portion 62. And the bottom of the recess 62 (the deepest part).
- the outer diameter of the tip end of the rod-shaped fitting protrusion 42 is a
- the outer diameter of the root portion of the rod-shaped fitting protrusion 42 is b
- the inner diameter of the inlet portion of the recessed fitting portion 62 is A
- the deepest portion of the recessed fitting portion 62 Assuming that the inner diameter of the position where the tip of the rod-like fitting protrusion 42 approaches and reaches is B, the following relationship is established. B ⁇ a ⁇ b ⁇ A
- the shavings are accommodated in the space between the tip of the rod-like fitting protrusion 42 and the bottom surface (the deepest part) of the recessed fitting portion 62, and the rod-like fitting protrusion When 42 is cut, the shavings are accommodated in a space corresponding to the difference between the root outer diameter b of the rod-like fitting protrusion 42 and the inlet inner diameter A of the rod-like fitting protrusion 42.
- the core 40 is securely fixed to the upper collar mold 60 by the frictional contact relationship in which the rod-like fitting protrusion 42 is galvanically engaged and fitted into the recessed fitting portion 62.
- the core 40 has a single rod-like fitting protrusion 42, as another example, it may be provided with a plurality of rod-like fitting protrusions like a core 40A shown in FIG.
- the core 40A has two rod-like fitting protrusions 42a and 42b
- the upper collar 60A also has two concave fitting portions 62a and 62b correspondingly.
- the dimensional relationship between the rod-like fitting projections 42a and 42b and the recessed fitting portions 62a and 62b is the same as the dimensional relationship between the rod-like fitting projection 42 and the recessed fitting portion 62.
- the operation of the drive cylinder device 54 must be stopped in a state where the core 40 is in close contact with the upper collar 60 and the rod-like fitting protrusion 42 enters the recessed fitting portion 62.
- the distance between the initial position of the core 40 on the core support 58 shown in FIG. 10 and the fitting completion position of the core 40 shown in FIG. It is necessary to set the strokes in advance in the control device of the drive cylinder device 54. This will be described below with reference to FIGS.
- FIG. 14 shows a core model 70 having the same shape and the same dimensions as the core 40 except that the rod-like fitting protrusion 42 is not provided on the core support 58 of the core mounting device 50. Indicates the state. Illustrated The position of the core mounting device 50 is a core loading position that is held by the upper saddle type holding device 80 and deviated from the axis of the upper saddle type 60 in a fixed position.
- the core mounting device 50 moves from the position shown in FIG. 14 to a position aligned with the axis of the upper collar 60 in the fixed position (FIG. 15). While being on the common axis, the drive cylinder device 54 is operated to extend the piston rod 56, and the core model 70 on the core support 58 is brought into close contact with the upper collar 60. During this time, when the core model 70 contacts the upper collar mold 60, the pressure received by the piston rod 56 from the upper collar mold 60 starts to increase, and the pressure rapidly increases as the piston rod 56 further expands. The rise of core model 70 after core model 70 contacts upper collar 60 increases the contact pressure on upper collar 60. If this contact pressure becomes excessively high, the upper collar 60 and / or the core model 70 will be damaged. Accordingly, the operation of the drive cylinder device 54 must be stopped when a contact pressure is reached to fix the core model 70 in close contact with the upper collar 60 in an appropriate engagement relationship.
- FIG. 17 shows the stroke of the piston rod 56 (horizontal axis) and the pressure that the piston rod 56 receives from the upper saddle die 60 (vertical axis) when the core model 70 is brought into close contact with the upper saddle die 60. It is a graph which shows the relationship with). Appropriate contact pressure is assumed to be in the vicinity of point X (0.008-0.09MPa). From the graph in Fig. 17, the rod rod 56 required to bring the core model 70 into close contact with the upper saddle mold 60 is shown. The stroke can be confirmed, and when the core 40 is mounted and fixed on the upper collar 60 in the actual forging preparation work, the stroke of the piston rod 56 confirmed above is used as the movement distance of the core 40. If the control unit of the drive cylinder device 54 is set in advance, the core 40 can be fixed to the upper plate 60 while always maintaining an appropriate position. Suitable for mass production system.
- a forging technique capable of performing forging according to a yield without causing a product shape defect when forging is performed by a sand mold press casting process using a core.
- FIG. 1 is a schematic longitudinal sectional view showing the relationship between an upper saddle mold assembly and a lower saddle mold as one embodiment of the present invention.
- FIG. 2 is a schematic longitudinal sectional view of an upper collar type assembly according to an embodiment of the present invention, showing a mechanical coupling relationship between the core and the upper collar type.
- FIG. 3 A schematic longitudinal cross-sectional view of an upper saddle type assembly according to one embodiment of the present invention, showing a bonding relationship between the core and the upper saddle type using an adhesive.
- FIG. 4 A schematic vertical cross-sectional view of the upper saddle type assembly according to one embodiment of the present invention, showing the coupling relationship between the core and the upper saddle type due to frictional force.
- FIG. 5 A schematic longitudinal cross-sectional view of the upper cocoon type assembly according to one embodiment of the present invention, showing the coupling relationship between the core and the upper cocoon type by the sand.
- FIG. 6 A schematic longitudinal sectional view showing the pouring work process using the upper and lower mold assemblies and the lower mold according to one embodiment of the present invention.
- FIG. 7 is a schematic longitudinal sectional view showing a state where the upper saddle type assembly is lowered at the first speed after the pouring step shown in FIG.
- FIG. 8 is a schematic longitudinal sectional view showing a state where the upper saddle type assembly is lowered at the second speed following the state shown in FIG.
- FIG. 9 A schematic longitudinal sectional view showing a state in which the upper saddle mold assembly is stopped after the upper saddle mold assembly is overlapped with the lower saddle mold and applied with pressure after the state shown in FIG.
- FIG. 10 A schematic diagram according to one embodiment showing a state where the core placed on the core support of the core mounting device is positioned facing the upper collar placed on the upper side.
- FIG. 11 A schematic diagram showing a state where the core support is raised and the core is brought into close contact with the upper collar type.
- FIG. 14 A schematic diagram for explaining the operation when the core model is used to confirm in advance the distance of movement of the core for fixing the core to the upper saddle type.
- FIG. 15 is a schematic diagram showing a state where the core model is positioned in the lower part of the upper collar type.
- FIG. 17 is a graph showing the relationship between the piston rod stroke (horizontal axis) and the pressure that the piston rod receives from the upper saddle type (vertical axis) in relation to FIGS.
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Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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CN200780044258XA CN101573195B (zh) | 2006-12-01 | 2007-09-27 | 铸造方法、上铸型组装体、及型芯相对于上铸型的固定方法 |
JP2008548186A JP4991755B2 (ja) | 2006-12-01 | 2007-09-27 | 鋳造方法、上鋳型組立体、および上鋳型に対する中子の固定方法 |
US12/516,092 US20100018664A1 (en) | 2006-12-01 | 2007-09-27 | Casting process, upper mold assembly and method of securing core to upper mold |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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JP2006-325303 | 2006-12-01 | ||
JP2006325303 | 2006-12-01 | ||
JP2007152473 | 2007-06-08 | ||
JP2007-152473 | 2007-06-08 |
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WO2008068947A1 true WO2008068947A1 (ja) | 2008-06-12 |
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PCT/JP2007/068855 WO2008068947A1 (ja) | 2006-12-01 | 2007-09-27 | 鋳造方法、上鋳型組立体、および上鋳型に対する中子の固定方法 |
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US (1) | US20100018664A1 (ja) |
EP (1) | EP1927415B1 (ja) |
JP (1) | JP4991755B2 (ja) |
KR (1) | KR20080050307A (ja) |
CN (1) | CN101573195B (ja) |
BR (1) | BRPI0705825A (ja) |
EA (1) | EA012717B1 (ja) |
WO (1) | WO2008068947A1 (ja) |
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KR102185401B1 (ko) * | 2020-07-06 | 2020-12-01 | 주식회사 에치디엘 | 부품 제조 장치 및 부품 제조 시스템 |
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PL241319B1 (pl) * | 2020-11-02 | 2022-09-05 | Lothar Thoni | Forma odlewnicza hybrydowa i sposób wykonania formy odlewniczej hybrydowej zwłaszcza do wytwarzania odlewów ze stopów metali |
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- 2007-09-27 WO PCT/JP2007/068855 patent/WO2008068947A1/ja active Search and Examination
- 2007-09-27 JP JP2008548186A patent/JP4991755B2/ja active Active
- 2007-09-27 US US12/516,092 patent/US20100018664A1/en not_active Abandoned
- 2007-11-14 BR BRPI0705825-0A patent/BRPI0705825A/pt not_active Application Discontinuation
- 2007-11-14 KR KR1020070116217A patent/KR20080050307A/ko not_active Application Discontinuation
- 2007-11-15 EP EP07120818.5A patent/EP1927415B1/en not_active Not-in-force
- 2007-11-16 EA EA200702259A patent/EA012717B1/ru not_active IP Right Cessation
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Also Published As
Publication number | Publication date |
---|---|
KR20080050307A (ko) | 2008-06-05 |
BRPI0705825A (pt) | 2008-07-15 |
EP1927415A1 (en) | 2008-06-04 |
EA200702259A1 (ru) | 2008-06-30 |
JPWO2008068947A1 (ja) | 2010-03-18 |
JP4991755B2 (ja) | 2012-08-01 |
CN101573195B (zh) | 2012-11-21 |
EA012717B1 (ru) | 2009-12-30 |
EP1927415B1 (en) | 2013-04-10 |
CN101573195A (zh) | 2009-11-04 |
US20100018664A1 (en) | 2010-01-28 |
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