Metallic component, and metallic component manufacturing method

Abstract

To provide a metallic component with a relatively high strength, and a metallic component manufacturing method that can effectively manufacture such a metallic component.SOLUTION: A metallic component 1 has a recessed part 2, and a peripheral edge part 3 continuously formed around the recessed part 2. The recessed part 2 includes a flat bottom 4 which is positioned on a back side with respect to the peripheral edge part 3, and a side part 5 which connects the bottom 4 to the peripheral edge part 3. A surface area of the peripheral edge part 3 is three times or more a planar projection area Ar of the recessed part 2, a depth Dr of the recessed part 2 is two times or more a thickness of the bottom 4, a thickness of the metallic component 1 is 0.1 mm or less, and a thickness Tmin of a thinnest portion of the side part 5 is 70% or more of the thickness of the bottom 4.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] This specification discloses a metal component and a method for manufacturing the metal component. [Background technology]

[0002] In some cases, devices or substrates mounted on electronic devices and the like must be placed on metal parts to be isolated from the outside, which may be in a high-temperature or corrosive environment. In these electronic devices, the metal members used have a recessed portion in which the device or substrate is housed, and a peripheral portion formed around the recessed portion.

[0003] In manufacturing such metal parts, a method for providing the above-mentioned recessed portion in a metal plate includes drawing by pressing.

[0004] For example, Patent Document 1 proposes an example of this type of technology, which aims to "effectively reduce thickness loss at a shoulder curved portion," and which is a "press drawing method for producing a formed body including a bulging portion, the press drawing method comprising: a first step of pressing a plate material, which is a plate-shaped substrate, in a first direction with a first die to produce a first formed body, the formed body including the bulging portion, the portion having a bulging shape; and a second step of pressing, with a second die, at least a part of the shoulder curved portion, which is a portion from the ridge line to a side surface of the bulging portion, in a second direction that is a direction toward the inside of the bulging portion rather than the first direction, while constraining the shape of a central portion of the bulging portion of the first formed body, to produce a second formed body, the formed body having the shoulder curved portion closer to a desired shape than the shape of the shoulder curved portion of the first formed body." [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2022-107452 A Summary of the Invention [Problem to be solved by the invention]

[0006] In the above-mentioned metal parts, from the viewpoint of ease of mounting on a substrate or the like and ensuring the required strength, the peripheral portion may be required to be relatively large relative to the recessed portion. In addition, in recent years, as various electronic devices have become lighter, thinner, and smaller, the thickness of the metal members is also required to be thin. Therefore, from the viewpoint of ensuring the strength of the metal members even when they are lighter, thinner, and smaller, seamless drawing may be required.

[0007] When a metal part with a relatively large peripheral portion with respect to such a recess is manufactured by drawing a thin metal plate, the metal part is often damaged during the forming process. Even if the metal part can be formed without damage, it has been newly discovered that the side of the recess formed by the drawing process has an extremely thin portion, which reduces the strength of the metal part. For this reason, it has been difficult to manufacture metal parts with the required strength by the conventional drawing process.

[0008] Other methods for forming recesses in a metal plate include cutting and casting. However, if the workpiece is thin, cutting can easily cause cracks during processing, and casting can cause shrinkage cavities and insufficient filling.

[0009] This specification provides a metal component having a relatively high strength and a method for manufacturing such a metal component that can effectively manufacture such a metal component. [Means for solving the problem]

[0010] The metal member disclosed in this specification has a recessed portion and a peripheral portion formed continuous with the periphery of the recessed portion, the recessed portion including a flat bottom portion recessed relative to the peripheral portion and a side portion connecting the bottom portion to the peripheral portion, the surface area of ​​the peripheral portion being three times or more the planar projection area of ​​the recessed portion, the depth of the recessed portion being two times or more the thickness of the bottom portion, the thickness of the metal member being 0.1 mm or less, and the thickness of the thinnest point of the side portion being 70% or more of the thickness of the bottom portion.

[0011] The manufacturing method of a metal member disclosed in this specification is a method for manufacturing a metal member having a recessed portion and a peripheral portion formed around the recessed portion, wherein the metal member has a thickness of 0.1 mm or less, the recessed portion includes a flat bottom portion recessed relative to the peripheral portion and a side portion connecting the bottom portion to the peripheral portion, the planar projected area of ​​the peripheral portion is three times or more the planar projected area of ​​the recessed portion, and the depth of the recessed portion is two times or more the thickness of the bottom portion of the metal member, and the metal plate is subjected to a plurality of drawing operations, with at least one of the drawing operations from the second time onwards comprising a pressing step which is a non-constrained drawing operation in which a punch is pressed against the recessed region in the metal plate without constraining the peripheral region around the recessed region. Effect of the Invention

[0012] The above-mentioned metal member has a relatively high strength. Moreover, according to the above-mentioned method for manufacturing a metal member, such a metal member can be effectively manufactured. [Brief description of the drawings]

[0013] [Figure 1] FIG. 2 is a perspective view showing a metal member according to one embodiment. [Diagram 2] FIG. 2 is a plan view of the metal member shown in FIG. [Diagram 3] FIG. 3 is a cross-sectional view taken along line III-III in FIG. [Figure 4] FIG. 4 is a partially enlarged cross-sectional view of FIG. [Diagram 5] FIG. 11 is a cross-sectional view showing a metal member according to another embodiment. [Figure 6] 1 is a cross-sectional view of a press and a metal plate, illustrating non-constrained drawing in a manufacturing method according to one embodiment. FIG. [Figure 7] FIG. 7 is a cross-sectional view showing the operation of the press machine subsequent to FIG. 6. [Figure 8] FIG. 2 is a cross-sectional view of a metal member according to an embodiment. [Figure 9] FIG. 4 is a cross-sectional view of a metal member of a comparative example. [Figure 10] 1 is a diagram illustrating the depth Dr of a recessed portion 2. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, embodiments of the above-mentioned metal member and the method for manufacturing the metal member will be described in detail with reference to the drawings.

[0015] (Metal parts) The metal member 1 illustrated in FIG. 1 has a recessed portion 2 and a brim-like or flange-like peripheral portion 3 that is formed in a continuous manner around the recessed portion 2 and extends outward from the recessed portion 2. The metal member 1 may be made of, for example, copper, aluminum, stainless steel, iron, or alloys thereof. From the viewpoint of high electrical conductivity and strength, the material of the metal member 1 is preferably Cu or a Cu alloy, more specifically, phosphor bronze, brass, Corson copper, oxygen-free copper, tough pitch copper, titanium copper, etc. In particular, the material of the metal member 1 may be C11000, C10200, C19400, C19900, C70250, C26000, C52100, or the like, which are standards set by the Copper Development Association (CDA).

[0016] In this example, as shown in Fig. 2, a square-shaped recessed portion 2 with slightly rounded corners is provided in the center of a metal member 1 having a rectangular outer contour shape in a plan view, and a peripheral portion 3 is formed in a frame shape around the recessed portion 2. The frame-shaped peripheral portion 3 has an inner contour shape that is a square shape corresponding to the shape of the recessed portion 2, and an outer contour shape that is a rectangle corresponding to the outer contour shape of the metal member 1. However, the shapes of the metal member 1, the recessed portion 2, and the peripheral portion 3, the position at which the recessed portion 2 is provided in the metal member 1, etc. may be changed as appropriate.

[0017] As shown in the cross-sectional view of Fig. 3, the recessed portion 2 includes a flat bottom portion 4 recessed from the peripheral portion 3 in the thickness direction of the peripheral portion 3 (vertical direction in Fig. 3), and side portions 5 extending along substantially the thickness direction of the peripheral portion 3 to connect the bottom portion 4 to the peripheral portion 3. More specifically, in the illustrated example, four side portions 5 each having a rectangular plate shape connected to adjacent ones are provided on each of the four sides of the bottom portion 4 having a square flat plate shape, surrounding the bottom portion 4 in a standing state from the bottom portion 4 toward the peripheral portion 3. Here, the flat portion of the bottom surface 4a of the recessed portion 2 (the surface facing upward in Fig. 3) is referred to as the bottom portion 4, and the non-flat portions around the bottom portion 4 are referred to as the side portions 5.

[0018] For example, as described below, by manufacturing the metal member 1 by applying a drawing process to a single metal plate using a press, the entire metal member 1, that is, the recessed portion 2 including the bottom portion 4 and the side portion 5, and the peripheral portion 3 are formed as a single unit. The one-piece metal member 1 has no seams generated by welding or the like, and therefore can achieve high strength.

[0019] Here, it was found that if a thin metal plate is simply subjected to drawing to form a relatively deep recess and to manufacture a metal component with a relatively large peripheral portion with respect to the recess, a very thin portion will be formed on the side of the recess. In this case, there is a concern that the strength of the thin portion on the side will be reduced and the metal component will not satisfy the required quality requirements. In the worst case, cracks may occur in the thin portion on the side, making it impossible to manufacture the metal component.

[0020] In response to this problem, the inventors have found, through extensive research, that by performing drawing as in the manufacturing method described below, it is possible to prevent the formation of portions on the sides of the recessed portion where the thickness becomes too thin. The metal member 1 thus manufactured ensures a required thickness on the side portions 5 of the recessed portion 2.

[0021] Specifically, the metal member 1 has a thickness of 0.1 mm or less. In a boundary region Ab (see FIG. 4) between the bottom portion 4 and the side portion 5, which is strongly affected by the drawing process, the thickness of the metal member 1 may locally exceed 0.1 mm. Therefore, the thickness of the metal member 1 refers to the thickness at the center position of the bottom portion 4, which is less affected by such processing. It is often difficult to manufacture a metal member 1 having such a thin thickness by cutting a metal plate or casting. Typically, the thickness of the metal member 1 may be 0.03 mm to 0.1 mm.

[0022] The surface area of ​​the peripheral portion 3 of the metal member 1 is three times or more the planar projection area Ar of the recessed portion 2. Here, the planar projection area Ar of the recessed portion 2 means the area when the recessed portion 2, including the thickness of the side portion 5, is projected onto a plane parallel to the bottom surface 4a of the flat bottom portion 4, as shown in FIG. 3. Here, the surface area of ​​the peripheral portion 3 means the entire area of ​​the surface of the peripheral portion 3 (the upper surface in FIG. 3). The boundary position between the side portion 5 of the recessed portion 2 and the peripheral portion 3 is the position of the corner if the boundary is angular, or is curved, as shown in FIG. 4, when viewed in cross section, the position where the inclination θ of a perpendicular line perpendicular to a tangent drawn on the curved surface on the opposite side to the recessed portion 2 side (the right side in FIG. 4) to the plane parallel to the bottom surface 4a gradually increases from the side portion 5 toward the peripheral portion 3, and the inclination θ becomes 45°. The recessed portion 2 and / or the peripheral portion 3 may have through holes (not shown). In this case, the above-mentioned planar projection area Ar of the recessed portion 2 and the surface area of ​​the peripheral portion 3 are calculated including the area of ​​the through holes without taking the through holes into consideration.

[0023] As shown in FIG. 5, the peripheral portion 13 may further be provided with a ring-shaped protrusion 13a, which protrudes diagonally outward from the same side as the recessed portion 12 (the lower side in FIG. 5), integrally on a part or the whole of the periphery. In this case, the above-mentioned surface area of ​​the peripheral portion 13 includes the area of ​​the surface of the protrusion 13a facing outward. The surface area of ​​the peripheral portion 13 means the entire surface area of ​​the portion that extends continuously around the recessed portion 2, including a bent or curved portion such as the protrusion 13a. The metal member 11 shown in FIG. 5 has substantially the same configuration as the embodiment shown in FIGS. 1 to 4, except that the protrusion 13a is provided.

[0024] Depending on the application of the metal member 1, the surface area of ​​the peripheral portion 3 may be set to 5 times or more, or even 8 times or more, the planar projected area Ar of the recessed portion 2. On the other hand, the surface area of ​​the peripheral portion 3 is preferably set to 20 times or less, or even 18 times or less, the planar projected area Ar of the recessed portion 2. By not making the peripheral portion 3 too large, the peripheral region of the metal plate is well drawn toward the recess-forming region in the non-constrained drawing process during manufacturing, which will be described later, and therefore excessive reduction in the thickness of the side portion 5 of the recessed portion 2 can be more effectively suppressed.

[0025] The depth Dr of the recessed portion 2 is set according to the device or substrate to be accommodated in the recessed portion 2, and may be set to be at least twice, or even at least five times, the thickness of the bottom portion 4. When the recessed portion 2 is so deep, it has been difficult to form a side portion 5 having a certain thickness using conventional manufacturing methods, but this is possible using the manufacturing method described below. From the viewpoint of ensuring the strength of the side portion 5, the depth Dr of the recessed portion 2 may be set to be at most ten times the thickness of the bottom portion 4. In addition, from the viewpoint of ensuring a space for accommodating a device or substrate in the recessed portion 2, the depth Dr of the recessed portion 2 may be set to be at least twice the thickness of the bottom portion 4. A method for measuring the depth Dr of the recessed portion 2 will be described later in the section on examples.

[0026] As described above, even if the metal member 1 is thin, has a relatively large peripheral portion 3, and has a relatively deep recessed portion 2, in this embodiment, the required thickness of the side portion 5 is ensured. Specifically, the thickness Tmin of the thinnest portion 5a, which is the thinnest portion of the side portion 5, is 70% or more of the thickness of the bottom portion 4. The thickness of the bottom portion 4 means the thickness at the center position of the bottom portion 4. To obtain the thickness Tmin of the thinnest portion 5a, a cross section obtained by an optical microscope as shown in FIG. 4 is taken as a reference point of the side portion 5 that is considered to be the thinnest, and thicknesses are measured along the bottom parallel direction for a total of 19 points, 9 points spaced apart at intervals of 0.01 mm on both sides of the reference point in a direction perpendicular to a plane parallel to the bottom surface 4a of the flat bottom portion 4 (also called the "bottom parallel direction"; corresponding to the left-right direction in FIG. 4). The smallest measured value among these is taken as the thickness Tmin of the thinnest portion 5a. In setting 19 measurement points on both sides of the part of side 5 that is considered to be the thinnest, if the measurement points extend beyond the area of ​​side 5 in the direction perpendicular to the bottom surface and reach the bottom surface 4a of bottom 4 or the back surface of peripheral portion 3 (the lower surface in Fig. 4), no measurement points are set further toward bottom 4 or peripheral portion 3. For this reason, there may be fewer than 19 measurement points.

[0027] From the viewpoint of ensuring the required strength, it is preferable that the thickness Tmin of the thinnest part 5a of the side part 5 is 70% or more, and even more preferably 75% or more, of the thickness of the bottom part 4. Note that the thickness Tmin of the thinnest part 5a is often equal to or less than the thickness of the bottom part 4, that is, 100% or less of the thickness of the bottom part 4.

[0028] (Manufacturing method) To manufacture the above-mentioned metal member 1, for example, a flat metal plate is first prepared. This metal plate is made of the same material as the above-mentioned material of the metal member 1 to be manufactured, and can have a thickness of 0.1 mm or less, similar to the metal member 1.

[0029] Then, a pressing process is performed in which the metal plate is subjected to a plurality of drawing processes. At least one of the drawing processes from the second drawing process onward is a non-constrained drawing process. The non-constrained drawing process refers to a drawing process in which a punch is pressed against a recess-forming region in the metal plate without constraining a peripheral region around the recess-forming region.

[0030] More specifically, for example, as shown in FIG. 6, a press machine having a punch 101 and a stripper 102 may be used to perform non-constrained drawing on a metal sheet 51 that has already been subjected to one or more rounds of drawing.

[0031] In the non-constrained drawing, the punch 101 can be pressed against the recess formation region 52 as shown by the white arrow in Fig. 6 while the stripper 102 is maintained at a position separated from the peripheral region 53 without being pressed against the peripheral region 53 around the recess formation region 52 of the metal sheet 51. At this time, the peripheral region 53 of the metal sheet 51 is not pressed against by the stripper 102, and is therefore not constrained by the stripper 102. For this reason, in many cases, the peripheral region 53 jumps up toward the stripper 102 due to the pressing of the punch 101 against the recess formation region 52, and at this time, it is considered that the material constituting the metal sheet 51 is easily drawn from the peripheral region 53 side into the side corresponding region 55 of the recess formation region 52.

[0032] As a result, in the finally obtained metal component 1, the recess-forming region 52 of the metal plate 51 becomes the recessed portion 2, and the peripheral region 53 of the metal plate 51 becomes the peripheral portion 3, and the required thickness of the side portion 5 of the recessed portion 2 is ensured by, for example, the material being drawn into the side corresponding region 55 of the recess-forming region 52 by the above-mentioned unconstrained drawing process. This prevents a decrease in strength at the side portion 5, making it possible to manufacture a metal component 1 having a relatively high strength.

[0033] As shown in Fig. 6, after punch 101 is pressed against depression formation region 52 of metal plate 51, it is preferable to press peripheral region 53 around depression formation region 52 with stripper 102 while pressing punch 101 in this manner, as shown by the white arrow in Fig. 7. In this way, peripheral region 53 is pressed down by stripper 102 as shown by the solid black arrow in the figure, and jumping up when punch 101 is pressed against depression formation region 52 is corrected.

[0034] In the first drawing process before the non-constrained drawing process, although not shown in the figure, for example, by pressing a stripper against the recess formation region 52 and the peripheral region 53 simultaneously, it is possible to press the recess formation region while constraining the peripheral region.

[0035] Preferably, the final drawing is a non-constrained drawing, and a plurality of drawing processes are performed prior to the non-constrained drawing, whereby the metal sheet 51 can be gradually shaped closer to the target shape with each drawing, and the final non-constrained drawing can be formed into the desired shape, thereby more effectively suppressing the occurrence of defective shapes and cracks.

[0036] From the same viewpoint, it is further preferable to gradually decrease the radius of curvature of the curved boundary region Ab between the bottom corresponding region 54 and the side corresponding region 55 of the recess formation region 52 of the metal plate 51 in each drawing process before the final non-constrained drawing process. Specifically, each stripper can be used in each drawing process such that the radius of curvature of the portion pressed against the boundary region Ab gradually decreases with each drawing process.

[0037] The metal member 11 shown in FIG. 5 may be manufactured by further processing the peripheral region after the above-mentioned drawing process is completed. EXAMPLES

[0038] Next, the above-mentioned metal member was prototyped and evaluated, which will be described below. However, the description here is merely for illustrative purposes and is not intended to be limiting.

[0039] An attempt was made to produce a metal component by applying a drawing process to a metal plate using a press, the metal component having a recessed portion located in the center when viewed from above and a peripheral portion formed adjacent to the recessed portion.

[0040] The metal member (metal plate) is made of phosphor bronze and has a thickness of 0.061 mm. The dimensions of the metal member in plan view are 5.8 mm x 6.0 mm, the dimensions of the recess in plan view are 1.7 mm x 1.8 mm, and the surface area of ​​the peripheral part is 31.7 mm. 2 The drawing process was performed so that the surface area of ​​the peripheral portion was 10.4 times the planar projection area Ar of the recessed portion. The punch of the die was adjusted so that the radius of curvature R of the inner surface of the boundary region Ab between the side of the recessed portion of the metal member and the bottom was 0.10 mm.

[0041] As a reference example, when a metal plate was pressed against a stripper in a single drawing process to draw it into the final shape of a metal component, the boundary area between the side and the bottom of the recessed portion suddenly became thin, and a crack occurred there.

[0042] For this reason, in a comparative example, the drawing process was divided into several steps, and in each drawing process, material was gradually supplied from the peripheral region to the depression formation region to suppress cracks on the side of the depression portion. A punch and a stripper were used in each drawing process, and the stripper used had a shape in which the radius of curvature of the boundary region between the side corresponding region of the depression formation region of the metal plate and the bottom corresponding region gradually becomes smaller as the drawing process is repeated. In the final drawing process, the punch was pressed against the depression formation region while the peripheral region was pressed down by the stripper.

[0043] In the embodiment, in the final drawing, a press machine was used in which a punch for pressing the depression formation region of the metal plate and a stripper for pressing the peripheral region could operate independently, as shown in Figures 6 and 7. As a result, in the final drawing, non-constrained drawing was performed in which the punch was pressed against the depression formation region without constraining the peripheral region. The steps other than the final drawing were the same as those in the comparative example.

[0044] A cross section of the metal member of the Example is shown in Figure 8, and a cross section of the metal member of the Comparative Example is shown in Figure 9. For the metal members produced in the Comparative Example and Example above, the thickness Tmin of the thinnest part on the side of the recess (on the left and right sides of the cross section) was measured by the method described above. The results are shown in Table 1. The thickness of the bottom of the recess was 0.061 mm in both the Example and the Comparative Example.

[0045] [Table 1]

[0046] FIG. 10 is a diagram for explaining the depth Dr of the recessed portion. FIG. 10 shows a cross-sectional view of a metal member of a comparative example. The straight line portion inside the recessed portion 2, excluding the boundary region Ab curved between the bottom portion 4 and the side portion 5 and the boundary region Bb curved between the side portion 5 and the peripheral portion 3, of the side portion 5, is defined as the side portion 5b. The straight line portion of the peripheral portion 3, excluding the boundary region Bb, continuing to the inside of the recessed portion 2, is defined as the peripheral portion 3b. When a perpendicular line is drawn from the intersection point X1 generated by extending the side portion 5b and the peripheral portion 3b to the plane formed by the bottom portion 4, which is the flat portion of the bottom surface 4a (a straight line in FIG. 10, which is a cross-sectional view), an intersection point X2 is generated. The distance from the intersection point X1 to the intersection point X2 is defined as the depth Dr of the recessed portion 2.

[0047] As can be seen from Table 1, the metal member of the comparative example had a thickness of 0.039 μm at the thinnest part, which was 63.9% of the thickness at the bottom of the recessed portion. In contrast, the metal member of the example had a thickness of 0.048 μm at the thinnest part, which was 78.7% of the thickness at the bottom of the recessed portion. Furthermore, the depth of the recessed portion of the comparative example measured by the above-mentioned method was 0.382 mm (6.26 times the thickness at the bottom), while the depth of the recessed portion of the example was 0.442 mm (7.24 times the thickness at the bottom). This depth of the recessed portion is the average value of the depths on the left and right sides of the cross section of the recessed portion.

[0048] Thus, the depth of the recessed portion in the Example is deeper than that of the Comparative Example. In other words, the metal member in the Example is more drawn than the metal member in the Comparative Example. Although the thickness of the side of the recessed portion tends to become thinner as it is drawn, the thinnest part of the metal member in the Example was thicker than the thinnest part of the metal member in the Comparative Example. The inventor believes that the reason for this is that in the Example, when the punch was pressed against the recessed region in the final non-constrained drawing process, the peripheral region jumped up, and as a result, material was drawn from the peripheral region into the recessed region, resulting in a metal member with sufficient thickness at the thinnest part.

[0049] From the above, it was suggested that the above-mentioned manufacturing method may enable the manufacturing of metal components having relatively high strength. [Explanation of symbols]

[0050] 1, 11 Metallic parts 2, 12 Recessed part 3, 13 Periphery 13a Projection 4, 14 bottom 4a, 14a bottom 5, 15 Side 5a Thinnest part 51 Metal plate 52 Depression formation area 53 Periphery 54 Bottom Corresponding Area 55 Side Corresponding Area 101 Punch 102 Stripper Ab Side border area with bottom Ar: Planar projection area of ​​the recess Dr Depth of the recess R is the radius of curvature of the inner surface of the boundary region Tmin: Thickness of the thinnest part of the side

Claims

1. A metal member having a recessed portion and a peripheral portion formed in a continuous manner around the recessed portion, the recessed portion includes a flat bottom portion recessed relative to the peripheral portion and a side portion joining the bottom portion to the peripheral portion; The surface area of ​​the peripheral portion is three times or more the planar projected area of ​​the recessed portion, The depth of the recessed portion is at least twice the thickness of the bottom portion, The thickness of the metal member is 0.1 mm or less, and the thickness of the thinnest part of the side is 70% or more of the thickness of the bottom.

2. 2. The metal member according to claim 1, wherein the surface area of ​​the peripheral portion is 20 times or less the planar projected area of ​​the recessed portion.

3. A method for manufacturing a metal component having a recessed portion and a peripheral portion formed in continuity with the recessed portion, comprising the steps of: the metal member has a thickness of 0.1 mm or less, the recessed portion includes a flat bottom portion recessed relative to the peripheral portion and a side portion connecting the bottom portion to the peripheral portion, the planar projected area of ​​the peripheral portion is three times or more the planar projected area of ​​the recessed portion, and the depth of the recessed portion is two times or more the thickness of the bottom portion of the metal member, A manufacturing method for a metal component includes a pressing process in which a metal plate is subjected to multiple drawing processes, and at least one of the drawing processes from the second time onwards is a non-constrained drawing process in which a punch is pressed against a recess formation area in the metal plate without constraining the peripheral area around the recess formation area.

4. 4. The method for manufacturing a metal component according to claim 3, wherein, after a punch is pressed against the depression formation region in the non-constrained drawing, a peripheral region around the depression formation region is pressed with a stripper while the punch is being pressed.

5. 5. The method for manufacturing a metal member according to claim 3, wherein a final drawing in the pressing step is the non-constrained drawing, and a plurality of drawing steps are performed prior to the non-constrained drawing.

6. 6. The method for manufacturing a metal component according to claim 5, wherein in the press process, in each of the drawing processes prior to the non-constrained drawing process, the radius of curvature of the boundary region between the side corresponding region of the recess formation region of the metal plate and the bottom corresponding region is gradually reduced.

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