JP2008036699A - Thin wall metallic structure, and method of and apparatus for forging thin metallic plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thin wall metallic structure which can be formed by forging without applying a heavy load to a thin metallic plate so as to have high geometric accuracy, and further to provide its forging method and apparatus. <P>SOLUTION: A thin metallic plate M is extrudedly forged by applying a force to the peripheral region of the thin metallic plate M by means of the punch portion 104 of an upper die 100. In this case, the metal flows from the peripheral region outward because the force is applied to the central region of the thin metallic plate M by means of a blank holding portion 105. At that time, a back pressure plate 206 is lifted by hydraulic pressure, and a die guiding portion 204 is lifted along the side surface of a die portion 203. Following lifting, a die guiding surface 204b is lifted with a required clearance between the die guiding surface 204b and the side surface 104c of the punch portion 104. As a result, the metal flowed from the peripheral region of the thin metallic plate M outward is flowed into the clearance between the side surface 104c and the die guiding surface 204b by being introduced by the lift of the die guiding surface 204b. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a thin metal structure integrally formed by forging using a thin metal plate, and a forging forming method and apparatus thereof.

Examples of a processing method for forming a thin metal structure such as a casing or a container using a thin metal plate include bending, overhanging, deep drawing, and the like, and a method using forging is also proposed. For example, Patent Document 1 describes a method of manufacturing a magnesium alloy forged thin-walled molded body, in which the radius of the punch shoulder (or die corner) of the rough forging die is set to be equal to that of the finish forging die. Using a die with a radius of 2-7 times the radius of the punch shoulder (or die corner), the thickness of the main part can be increased by high-temperature forging of the magnesium alloy sheet material in at least multiple steps of rough forging and finish forging. The point which shape | molds in a molded object of about 1.5 mm or less is described. Further, in Patent Document 2, a magnesium alloy thin plate material having a plate thickness of 3 mm or less is made of a chamfer or radius of a rising inner corner portion and / or outer corner portion of a wall portion of 1 mm or less, and a punch or die having a hollow portion. After rough forging at a material temperature of 200 to 540 ° C., a forming load of 1 to 30 ton / cm ² , a forging speed of 1 to 500 mm / second, and a reduction rate of 75% or less, finish forging at a reduction rate of 30% or less, The point which makes main part thickness 1.5mm or less is described.
JP 2000-246386 A JP 2001-170734 A

  When a thin metal structure is formed using a thin metal plate, it can be easily formed by bending with the plate thickness. However, when thinning the plate, Defects such as wrinkles are likely to occur. Further, when press forming is performed also in forging, it is necessary to apply a large load to reduce the plate thickness and increase the processing cost.

  Therefore, for example, when molding a thin metal structure using a magnesium alloy material, die casting, which is a type of casting, and thixomolding, which is similar to resin injection molding, are commonly used. There is a problem that there are many processes such as many welding processes.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a thin metal structure that can be formed by forging without applying a large load to a thin metal plate, and has a high dimensional accuracy, and a forging forming method and apparatus thereof. is there.

  The thin metal structure according to the present invention is a thin metal structure formed by forging and extruding a peripheral region of a thin metal plate, and is integrally formed around a bottom surface portion where the peripheral region is thinner than the central region. It is characterized by having a peripheral wall part.

  In the method for forging and forming a thin metal plate according to the present invention, the die guide surface arranged around the thin metal plate is crossed with the processed surface of the thin metal plate in a state where a predetermined load is applied to the central region of the thin metal plate. The peripheral wall portion is integrally formed by applying an extrusion load to a peripheral region other than the central region of the metal thin plate while being moved. Further, the peripheral region of the thin metal plate is defined inward from the outer peripheral end of the thin metal plate corresponding to the volume of the peripheral wall portion to be molded. Furthermore, it is performed in the temperature range of warm forging.

  The forging forming apparatus for a thin metal plate according to the present invention includes a plate holding portion disposed to face the central region of the thin metal plate and a punch portion disposed to face a peripheral region other than the central region of the thin metal plate. A predetermined portion is provided between the upper die provided, a die portion disposed to face the plate pressing portion and the punch portion, and a vertically movable portion around the die portion and the side surface of the punch portion. A lower mold having a mold guide portion on which a mold guide surface is formed with a space between the upper mold and the lower mold are relatively moved, and an extrusion load is applied between the punch section and the die section. It is characterized by comprising a processing load application means, a press load application means for applying a predetermined load by pressing the plate pressing portion against a central region of the thin metal plate, and a moving means for moving the die guide portion up and down. To do. Furthermore, the upper mold and the lower mold are provided with heating means for heating the metal thin plate. Further, the presser load applying means includes a spring member for applying a load.

  Since the present invention has the above-described configuration, only the peripheral region of the thin metal plate is formed by forging extrusion, so that forging can be performed with a small load, and metal with low cost and high dimensional accuracy is provided. A thin-walled structure can be obtained. And it becomes a lightweight and high intensity structure without a defect by shape | molding by a forge extrusion process from a bottom face part to a surrounding wall part.

  In other words, when press forming is performed by forging, it cannot be processed unless a large load is applied to the thin metal plate, but it is necessary to apply such a large load in the central region of the thin metal plate, and press the peripheral region. In the case of molding, it can be processed with a relatively small load. If the peripheral wall portion is formed by making the peripheral region flow while being thinned by forging extrusion, the casing and the container-like thin metal structure can be easily forged and formed with high accuracy. In other words, since only the peripheral region for supplying the amount necessary for forming the peripheral wall portion needs to be forged and extruded, it is sufficient to apply a load only to a small region, and the forging load can be reduced.

  And in a thin metal structure such as a metal casing, stress tends to concentrate on the curved part from the bottom surface part to the peripheral wall part, and breakage tends to occur.However, sufficient strength is achieved even by thinning by forming by forging extrusion processing. It can be set as the structure which has.

  In the method for forging and forming a thin metal plate according to the present invention, an extruding load is applied to the peripheral region in a state where a predetermined load is applied to the central region of the thin metal plate. It goes to the outside without heading, and the peripheral wall portion can be formed efficiently. And, by performing forging extrusion while moving the mold guide surface arranged around the thin metal plate in the direction intersecting with the processing surface of the thin metal plate, the metal material that has flowed outward by forging extrusion processing is The peripheral wall portion can be formed by flowing in a direction intersecting with the processing surface of the metal thin plate by being guided by the mold guide surface. In this way, since the fluid flows almost uniformly outward from the peripheral region, forging extrusion can be performed smoothly, and defects such as cracks and wrinkles hardly occur.

  If the peripheral region of the thin metal plate is defined inward from the outer peripheral end of the thin metal plate corresponding to the volume of the peripheral wall portion to be formed, the height of the peripheral wall portion can be forged as designed.

  In addition, by performing forging extrusion in the temperature range of warm forging, it is possible to easily perform forging molding of materials that are difficult to forge extrusion at room temperature, such as magnesium alloy materials.

  The forging and forming apparatus for a thin metal plate according to the present invention applies a predetermined load by pressing the upper plate pressing portion to the central region of the thin metal plate by the pressing load applying means, and the peripheral region of the thin metal plate by the processing load applying means. Is sandwiched between the punch portion and the die portion so as to apply an extruding load, so that the flow by forging extruding can surely be directed outward without going to the central region. And since the lower mold guide part is configured to move up and down by the moving means, the punch part while the mold guide surface of the mold guide moves the metal material that flows outward by forging extrusion. It can guide | induct between the side surfaces of and can shape | mold reliably on a surrounding wall part. Therefore, a thin metal structure can be formed by one press forming, and forging can be efficiently performed.

  In addition, by providing a heating means to heat the thin metal plate in the upper die and the lower die, if the thin metal plate is set between the upper die and the lower die, the thin metal plate is maintained in a stable temperature range for warm forging. can do.

  In addition, since the presser load applying means includes a spring member that applies a load, a constant load is always applied to the plate presser portion, so that the metal thin plate can be held in a stable state by being pressed against the die portion. it can.

  Hereinafter, embodiments according to the present invention will be described in detail. The embodiments described below are preferable specific examples for carrying out the present invention, and thus various technical limitations are made. However, the present invention is particularly limited in the following description. Unless otherwise specified, the present invention is not limited to these forms.

  FIG. 1 is a schematic configuration diagram relating to a forging apparatus according to the present invention. In this example, the servo press 1 is used as a forging molding apparatus. The servo press 1 includes a crown 2 incorporating a driving force transmission mechanism such as a crank mechanism, an eccentric mechanism, and a link mechanism, a slide 3 connected to the driving force transmission mechanism in the crown 2 via a plunger 4, and a bolster 6 And an upright 8 that stands on the upper surface of the bed 7 and supports the crown 2. An upper die 100 is attached and fixed to the lower surface of the slide 3, and a lower die 200 is attached and fixed to the upper surface of the bolster 6.

  FIG. 2 is a schematic configuration diagram relating to the operation control of the servo press 1. The slide 3 is controlled to move in the vertical direction by the slide drive unit 5 driven by the servo motor 9, and the rotation drive control of the servo motor 9 is performed by the drive control signal from the controller 10. The position is adjusted. The servo press 1 is provided with a bottom dead center position correcting device for the slide 3, and the controller 10 drives the position adjusting motor 12 to rotate the position adjusting mechanism 13 based on a detection signal from the slide position detector 11. It is operated to correct the position.

  In the servo press 1 described above, since the position of the slide 3 can be precisely controlled by the servo motor 9, the heating means is attached to the upper mold and the lower mold and the upper mold and the lower mold are brought into contact with the metal thin plate as will be described later. It becomes possible to perform heating by adjusting to the above, and it becomes possible to continuously perform the pressing process from the heating process with one apparatus. Therefore, a highly efficient and low cost forging process can be realized.

  FIG. 3 is a schematic configuration diagram relating to the upper mold 100 and the lower mold 200. FIG. 3 shows a pressed state in which the upper mold 100 fixed to the slide 3 moves downward and is crimped to the lower mold 200.

  The upper mold 100 includes a base 101 attached and fixed to the lower surface of the slide 3, an attachment base 102 fixed to the lower surface of the base 101 via a heat insulating plate T, and a heat insulating plate T attached to the lower surface of the attachment base 102. A spring holding portion 103 fixed in place, a punch portion 104 fixed to the lower surface of the spring holding portion 103 via a heat insulating plate T, and a plate that fits into a mounting hole 106 drilled in a central portion of the punch portion 104 And a presser portion 105. Inside the spring holding portion 103, a housing portion 108 for housing the compression spring member 107 is formed.

  A back pressure rod 110 is inserted into a mounting hole 109 that is drilled in and communicated with the base 101 and the central portion of the mounting base 102, and a lower end portion thereof extends into the accommodating portion 108. A flange portion 105 b is formed at the upper end portion of the plate pressing portion 105, and the flange portion 105 b is disposed on the upper surface of the heat insulating plate T disposed on the upper surface of the punch portion 104. The upper surface of the flange portion 105 is set so that the compression spring member 107 is pressed against and pressed downward via the heat insulating plate T, and the lower end portion of the back pressure rod 110 is in contact. ing.

  A heater H is inserted inside the punch unit 104, and the entire punch unit 104 is heated by heating the heater H.

  The lower mold 200 includes a base 201 attached and fixed to the upper surface of the bolster 6, an attachment base 202 fixed to the upper surface of the base 201 via a heat insulating plate T, and a heat insulating plate T attached to the upper surface of the attachment base 202. And a die guide portion 204 disposed around the die portion 203 so as to be movable up and down.

  A mounting hole 205 is formed in the central portion of the base 201, and a back pressure plate 206 is fitted into the mounting hole 205. The rod portion 204 a extending from the lower portion of the mold guide portion 204 is set so as to pass through a hole portion drilled in the mounting base 202 and contact the upper surface of the back pressure plate 206.

  A heater H is inserted into the die part 203 and the mold guide part 204, and by heating the heater H, the entire die part 203 and the mold guide part 204 are heated.

  A pressing portion 104a is formed on the lower surface of the punch portion 104 so that the central portion protrudes, and the lower surface of the pressing portion 104a becomes a processed surface 104b of the metal thin plate. The plate pressing portion 105 passes through the inside of the pressing portion 104a, and its lower surface is exposed at the center portion of the processing surface 104b to form a pressure contact surface 105a.

  The upper part of the die part 203 is formed with a pressing part 203a formed so as to face the pressing part 104a, and the upper surface of the pressing part 203a is opposed to the processing surface 104b and the pressure contact surface 105a and has an outer shape of the processing surface 104b. The processed surface 203b is formed so as to substantially match the above. When the mold guide surface 204b formed on the inner surface of the mold guide portion 204 is in contact with the entire circumference of the side surface of the pressing portion 203a, and the mold guide portion 204a rises along the side surface of the pressing portion 203a, the mold guide surface 204b. Rises along the side surface 104c of the pressing portion 104a of the punch portion 104. At that time, a predetermined interval is set between the side surface 104c of the pressing portion 104a and the mold guide surface 204b.

  FIG. 4 is a schematic configuration diagram illustrating an example of a back pressure device that applies pressure to the back pressure rod 110 and the back pressure plate 206. In this example, the compressed air supplied from the air conditioner press 20 is used to operate the hydraulic piston 21 to generate hydraulic pressure to operate the cylinders 24 and 25 to apply pressure to the back pressure rod 110 and the back pressure plate 206, respectively. ing. A valve 22, a hydraulic gauge 23, and a relief valve 24 are attached to the hydraulic line so that a predetermined load is applied to the back pressure rod 110 and the back pressure plate 206 through the cylinder.

  In addition, although the example which uses oil_pressure | hydraulic as a back pressure apparatus was demonstrated, you may make it apply mechanical pressure other than oil_pressure | hydraulic, and it does not specifically limit.

  FIGS. 5 and 6 are explanatory views showing steps in the case of performing forging extrusion of the metal thin plate M by the upper die 100 and the lower die 200. FIG. In FIG. 5, the upper die 100 is set at the raised position, and no hydraulic pressure is applied to the back pressure rod 110 and the back pressure plate 206. In this state, the plate pressing portion 105 is urged downward by the compression spring member 107 and pressed against the upper surface of the heat insulating plate T provided on the upper surface of the punch portion 104. Therefore, the press-contact surface 105a on the lower surface of the plate pressing portion 105 is in a state of slightly projecting downward from the processing surface 104b on the lower surface of the punch portion 104.

  Further, since the back pressure plate 206 is not subjected to hydraulic pressure, the back pressure plate 206 is moved downward due to its own weight and is in contact with the base 201. Accordingly, the die guide portion 204 also moves downward to move below the die portion 203. It is in a state of being locked to the stepped portion. In this state, the upper surface of the die guide portion 204 is slightly protruded from the processed surface 203b of the die portion 203. Then, the metal thin plate M is placed so as to be preliminarily coated with the lubricant and fitted into the processed surface 203b. If heating is required during processing, the heater H is energized in advance.

  Next, as shown in FIG. 6, the upper mold 100 is moved downward, and the position is finely adjusted so that the processed surface 104 b of the punch portion 104 is in contact with the peripheral region on the upper surface of the metal thin plate M. In this state, the pressure contact surface 105a of the plate pressing portion 105 is pressed against the central region of the thin metal plate M, so that the central region of the thin metal plate M is pressed and pressed by the urging force of the compression spring member 107. It is held between the processed surface 203b of the part 203.

  Since the thin metal plate M is surrounded by the punch portion 104, the die portion 203, and the die guide portion 204, it is heated by the heat from the heater H so that the whole is uniformly at a predetermined temperature. When it is necessary to set the metal thin plate to the forming temperature in advance, such as in warm forging, it is possible to heat the metal thin plate in advance with the upper die and the lower die, thus enabling efficient processing. Become. When performing cold forging, the heating step shown in FIG. 6 may be omitted and forging extrusion may be performed.

  After heating the metal thin plate to a predetermined temperature, a hydraulic pressure is applied to the back pressure rod 110 and the back pressure plate 206, and a load necessary for forging extrusion processing is applied to the upper die 100 and the lower die 200. FIG. 3 shows a state in which forging extrusion is performed. When the hydraulic pressure is applied to the back pressure rod 110, the plate pressing portion 105 is pressed down and a predetermined load is applied from the pressure contact surface 105a pressed against the central region of the thin metal plate M. The processing surface 104b of the punch portion 104 facing the region is squeezed down, and forging extrusion is performed between the processing surface 203b of the die portion 203.

  FIG. 7 is a partially enlarged view of a portion where forging extrusion is performed. Although the load G1 is applied to the peripheral region of the thin metal plate M by the forging extrusion process, the load G2 is applied to the central region of the thin metal plate M, so that the load G2 is applied outward from the peripheral region. It begins to flow toward. At that time, the back pressure plate 206 is raised by the hydraulic pressure, the die guide portion 204 rises along the side surface of the die portion 203, and accordingly, the die guide surface 204 b is between the side surface 104 c of the punch portion 104 and a predetermined amount. Ascends at intervals. Therefore, the metal that has flowed outward from the peripheral region of the thin metal plate M is guided by the rise of the mold guide surface 204b and flows into the gap between the side surface 104c, as indicated by the dotted arrow. . Thus, the peripheral wall portion is formed around the thin metal plate M by forging extrusion.

  Since the amount of metal flowing between the mold guide surface 204b and the side surface 104c changes depending on the reduction position of the processed surface 104 of the punch portion 104, the height of the peripheral wall portion can be adjusted by adjusting the reduction position. it can.

  FIG. 8 is a plan view showing an example in which a central region M0 and a peripheral region M1 are defined when a rectangular thin metal plate M is used. In this example, the thin metal plate M has a square shape in plan view and four corners rounded, and in such a shape, the peripheral region is a boundary line that enters the distance d1 from the outer peripheral edge corresponding to the four sides. And at the four corners are defined by boundary lines that enter the inside by a distance d2 longer than the distance d1. Such demarcation of the peripheral region may be set corresponding to the volume required for forming the peripheral wall portion. In this example, in order to form a peripheral wall portion having the same height around the periphery, the peripheral region is demarcated at an equal distance from the four sides. However, since the peripheral wall portion at the four corners requires more volume, The width is set large.

  In this way, the volume of the peripheral wall portion to be molded around the thin metal plate M is calculated in advance, and correspondingly, how much volume is required to flow in each part of the peripheral region is calculated and the region is defined. What should I do? Further, the press contact surface 105a of the plate pressing portion 105 is formed so as to match the central region thus defined, and the processing surface 104b of the punch portion 104 is formed so as to match the peripheral region.

  FIG. 9 is a perspective view (FIG. 9A) and a cross-sectional view taken along line AA (FIG. 9B) of a thin metal structure C formed by forging and extruding the thin metal plate M of FIG. In the metal thin-walled structure C, a portion C1 corresponding to the peripheral region that has been forged and extruded at the bottom surface portion is formed thinner than a portion C0 that corresponds to the central region that has not been forged and extruded, and the peripheral wall portion C2 is formed around the periphery. Are formed at a predetermined height. Since the metal flows from the peripheral region by forging extrusion, the peripheral portion C1 becomes thinner than the central portion C0, and the flowed portion is formed as the peripheral wall portion C2. Therefore, since it is forged and extruded from the peripheral portion C1 to the peripheral wall portion C2, the structure has a sufficient strength free from defects due to forging.

  FIG. 10 is a plan view showing an example in which a central region M0 ′ and a peripheral region M1 ′ are defined when a thin metal plate M ′ having a circular shape in plan view is used. In this example, it is demarcated by a boundary line that enters inward from the outer periphery of the metal thin plate M ′ by a distance d1 ′. By forming the press contact surface 105a of the plate pressing portion 105 and the processing surface 104b of the punch portion 104 in accordance with the central region M0 ′ and the peripheral region M1 ′ thus defined, forging and extruding, a peripheral wall portion is formed around the periphery. be able to.

  The planar shape of the thin metal plate can also correspond to shapes other than the rectangular shape and the circular shape described above, and in a portion where a large volume of metal is required for forming a peripheral wall portion such as a corner portion, A wide width may be set.

  FIG. 11 is a schematic diagram showing a modification example regarding the plate pressing portion 105. In this example, the plate presser portion 105 is divided into a peripheral presser portion 105A and a central presser portion 105B, and the central presser portion 105B is fitted into the peripheral presser portion 105A having a donut-shaped cross section and is slidably attached. It has been. As described above, hydraulic pressure is applied to the peripheral pressing portion 105A from the back pressure rod 110, but the central pressing portion 105B is urged downward by an elastic member (not shown) and pressed with a constant pressing force G3. It is supposed to be. Therefore, the region where the load is applied by the hydraulic pressure is only around the plate pressing portion 105, and the region where the load is applied can be reduced.

  When the central region pressed by the plate pressing portion 105 becomes wider, it is necessary to apply a larger load to the plate pressing portion 105 in order to maintain the state where the entire central region is pressed with a predetermined load. However, in order to suppress the flow to the central region when forged and extruded by the punch portion 104, a predetermined load may be applied to the periphery of the pressing region, and it is not always necessary to add the entire region. . In the modification shown in FIG. 11, the area to which the load is applied by the hydraulic pressure can be reduced, so that even if the area to be pressed by the plate pressing portion 105 widens, it is not necessary to apply a large load correspondingly.

  In addition, as a material of a metal thin plate, stainless steel material, aluminum and its alloy material, magnesium alloy material, copper and its alloy material, titanium and its alloy material, etc. are mentioned. In the case of aluminum and its alloy material, forging and extruding can be performed at room temperature, the heating step described with reference to FIG. 6 is not necessary. In the case of a magnesium alloy material, the material may be heated and forged and extruded by warm forging.

  A thin metal plate made of a magnesium alloy material (ASTM standard; AZ31B) and formed into a rectangular shape having a thickness of 1.2 mm and a 45 mm square was used. Using a servo press (manufactured by Komatsu Industries Co., Ltd., H1F45; press capacity 45 tonf, maximum processing speed 530 mm / sec), the upper die and the lower die shown in FIG. The central region of the metal thin plate was set to a rectangular shape.

  The metal thin plate was heated by being held between the upper mold and the lower mold for 10 seconds. The heating temperature was set to 350 ° C. The measurement of temperature confirmed the temperature of the metal sheet surface using infrared thermography.

The reduction ratio R (%) of the punch portion was defined as follows using the thickness t ₀ before processing and the thickness t after processing of the peripheral region of the metal thin plate, and was varied from 0 to 60%. .
R = (t ₀ −t) / t ₀ × 100
Further, the load p applied to the back pressure rod and the back pressure plate was changed to 1.02 to 5.86 MPa.

  About the surrounding wall part and bottom face part of the shape | molded structure, it was provided with sufficient intensity | strength without a defect. The experimental results are shown in FIG. In FIG. 12, the horizontal axis and the vertical axis represent the reduction rate R and the height h of the molded peripheral wall, respectively, and the measurement results for each back pressure load p are graphed. From the experimental results, it can be seen that the change in the height h of the peripheral wall portion due to the back pressure load p is not recognized so much, and the height of the peripheral wall portion can be adjusted by changing the rolling reduction ratio R even with a small load p.

  INDUSTRIAL APPLICABILITY The present invention is suitable for a housing structure of a small electronic device such as a mobile terminal, a mobile phone, and a digital camera, and is lighter and has sufficient strength when used for an electronic device that is required to be lightweight, such as a notebook personal computer. It is possible to forge-mold an excellent casing having Further, by using it in precision equipment such as a copying machine and a printer, a part with high dimensional accuracy can be forged.

It is a schematic block diagram regarding the forge molding processing apparatus which concerns on this invention. It is a schematic block diagram regarding the operation control of a servo press. It is a schematic block diagram regarding an upper mold | type and a lower mold | type. It is a schematic block diagram of the back pressure apparatus regarding a back pressure rod and a back pressure plate. It is explanatory drawing regarding the forge extrusion process of the metal thin plate by an upper mold | type and a lower mold | type. It is explanatory drawing regarding the forge extrusion process of the metal thin plate by an upper mold | type and a lower mold | type. It is a partially expanded view of the portion where forging extrusion is performed. It is a top view which shows the center area | region and peripheral area regarding a rectangular-shaped thin metal plate. It is the perspective view and AA sectional drawing regarding the metal thin structure which shape | molded the metal thin plate of FIG. It is a top view which shows the center area | region and peripheral area | region regarding a circular-shaped thin metal plate. It is the schematic which shows the modification regarding a board pressing part. It is a graph which shows the change of the height h of the surrounding wall part at the time of changing the rolling reduction R.

Explanation of symbols

1 Servo press
100 Upper mold
104 Punch part
105 Plate holder
107 Compression spring member
110 Back pressure rod
200 Lower mold
203 Die part
Type 204 guide
206 Back pressure plate

Claims (7)

  A thin metal structure formed by forging and extruding a peripheral region of a thin metal plate, and including a peripheral wall portion integrally formed around a bottom surface portion where the peripheral region is thinner than the central region. A thin metal structure.   In a state where a predetermined load is applied to the central region of the thin metal plate, the mold guide surface arranged around the thin metal plate is moved in a direction intersecting the processing surface of the thin metal plate, and the peripheral region other than the central region of the thin metal plate is moved. A method for forging and forming a thin metal plate, wherein the peripheral wall portion is integrally formed by applying an extrusion load.   The forging process method according to claim 2, wherein a peripheral region of the thin metal plate is defined inward from an outer peripheral end of the thin metal plate corresponding to a volume of a peripheral wall portion to be formed.   The forging method according to claim 2 or 3, wherein the forging is performed in a temperature range of warm forging.   An upper die provided with a plate holding portion disposed opposite to the central region of the metal thin plate and a punch portion disposed opposite to a peripheral region other than the central region of the metal thin plate, and the plate holding portion and the punch A die portion disposed opposite to the portion, and a die that is disposed so as to be movable up and down around the die portion and has a die guide surface formed at a predetermined interval between the side surface of the punch portion. A lower die provided with a guide portion, a processing load applying means for moving the upper die and the lower die relative to each other to apply an extrusion load between the punch portion and the die portion; and A forging forming apparatus for a thin metal sheet, comprising presser load applying means for applying a predetermined load in pressure contact with the central region of the metal plate, and moving means for moving the mold guide portion up and down.   The forging apparatus according to claim 5, wherein the upper mold and the lower mold are provided with heating means for heating the metal thin plate.   The forging process apparatus according to claim 5 or 6, wherein the presser load applying means includes a spring member for applying a load.

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