JP5878026B2 - Pressed part and method for manufacturing pressed part - Google Patents

Description

  The present invention relates to a pressed part and a manufacturing method of the pressed part.

  Conventionally, various press parts have been manufactured by pressing a metal plate such as an iron plate, a steel plate, an aluminum plate, and a phosphor bronze plate using a press working die. Examples of the pressing method include shearing, bending, drawing, and the like, and press parts are manufactured by performing processing while appropriately selecting or combining them.

For example, as shown in FIG. 6, the press component 100 includes a plate-like substrate 101, a pedestal portion 102 disposed at a position recessed with respect to the substrate 101, and a cylindrical shape that connects the pedestal portion 102 and the substrate 101. The throttle part 103 and the through hole 104 formed in the pedestal part 102 are provided, and by inserting a screw or the like through the through hole 104, the press part 100 is fixed to the mounting member. .
As a method for manufacturing such a pressed part 100, first, the substrate 101 is subjected to a drawing process to form a drawn portion 103. Then, the press part 100 mentioned above is completed by giving a shearing process (punching process) with respect to the base part 102, and forming the through-hole 104. FIG.

By the way, for example, Patent Document 1 has a punching process for forming a meat gathering hole around a convex portion before forming the convex portion by drawing, and the convex portion and the meat are formed when the convex portion is formed. The structure which ensures the thickness of a convex part by making the part between the holes for approaching actively retract in a convex part is disclosed.
That is, in the drawing process, a compressive force is generated toward the radially inner side of the drawn portion 103 due to plastic deformation when the substrate 101 is drawn, and a tensile force is generated along the axial direction. There is a possibility that the periphery of the portion 103 may be deformed or local stress concentration may occur. At this time, if there is a hole or shape that is functionally important around the aperture 103 (hereinafter referred to as a functional part), the functional part is displaced from a desired position or deformed, and the product function cannot be satisfied. There is.

  On the other hand, conventionally, for example, a deviation amount due to deformation or the like is calculated in advance, and correction is performed on the die (die, punch, stripper, etc.) so that the functional unit is arranged at a desired position after drawing processing. Measures are being taken.

JP-A 64-62227

  However, the above-described measures require operations such as calculating the amount of deviation and creating a mold in accordance with the relationship between the function unit and the diaphragm unit 103, resulting in a decrease in manufacturing efficiency and manufacturing. This will increase the cost. Further, for example, in the case of a minute press part incorporated in a timepiece or the like, or a complicated press part having a plurality of functional units or a drawing unit 103, the above-described operation is particularly troublesome.

  Therefore, the present invention has been made in view of such circumstances, and provides a pressed part and a pressed part manufacturing method capable of improving manufacturing efficiency while suppressing an increase in manufacturing cost. With the goal.

  The press part of the present invention includes a board having a functional part, a pedestal part that is disposed at a position recessed with respect to the board, and capable of contacting the mounting member when the board is attached to the mounting member, and the pedestal part In the press part having the diaphragm portion connecting the substrate and the substrate, the substrate extends between the pedestal portion and the functional portion of the substrate with a space along the circumferential direction of the pedestal portion. A plurality of throwing windows are formed, and the throttle portion is disposed between the throwing windows.

According to this configuration, since the throwing window between the pedestal part and the functional part is deformed during the throttling step for forming the throttling part, the deformation around the throttling part is absorbed by the throwing window, and the substrate The deformation of itself can be suppressed. Therefore, it is possible to suppress the deformation in the squeezing step from reaching the function part, and thus it is possible to suppress the positional deviation of the function part. Therefore, it is possible to stably manufacture a non-defective product in which the functional unit is arranged at a desired position.
In this case, since the configuration is such that only the discard window is formed around the pedestal portion, it is not necessary to create a mold according to the amount of deviation as in the conventional case. Therefore, it is possible to improve manufacturing efficiency while suppressing an increase in manufacturing cost.

By the way, at the time of drawing, the tensile force in the thickness direction of the substrate that acts when the substrate is drawn down also acts on the outside of the drawn portion, and the outer peripheral portion of the substrate is displaced to the opposite side of the drawn portion. There is a risk of warping in the whole.
On the other hand, according to the structure of this invention, it can suppress that the tension | tensile_strength mentioned above acts outside a throwing window, and can also suppress the curvature of the whole board | substrate.

Further, the discard window is opposed to the substrate along the radial direction of the substrate with the pedestal portion interposed therebetween.
According to this configuration, the tensile force in the thickness direction of the substrate and the compressive force in the radial direction that are applied when the substrate is narrowed easily act along the radial direction of the substrate. By making it oppose along a direction, the tensile force and compressive force which were mentioned above can be absorbed effectively.

Moreover, the said discard window is formed in two places at intervals along the circumferential direction of the said base part, It is characterized by the above-mentioned.
According to this configuration, by forming the two discard windows at intervals along the circumferential direction of the pedestal portion, the pedestal portion is stably supported by the squeezed portion, and the deformation in the squeezing process is changed to the substrate. It can be surely suppressed that it extends to the functional part. In addition, since the complexity of the mold can be suppressed as compared with a case where there are too many throttle portions (in the case of a plurality of three or more locations), further improvement in manufacturing efficiency and cost reduction can be achieved.

Further, the narrowed portion is characterized in that it is disposed symmetrically with the pedestal portion interposed therebetween.
According to this configuration, by arranging the throttle portions symmetrically with the pedestal portion interposed therebetween, the deformation of the throwing window becomes uniform in the throttle step. Therefore, the drawing process can be performed with high accuracy, and the distortion of the pedestal and the deformation of the substrate can be reliably suppressed.

Moreover, the outer side edge part along the extension direction of the said aperture | diaphragm | squeeze part is arrange | positioned inside the outer periphery of the said discard window, It is characterized by the above-mentioned.
According to this configuration, by arranging the outer peripheral edge of the throttle portion on the inner side of the outer peripheral edge of the throwing window, it is possible to reliably suppress the deformation in the throttle process from reaching the substrate and the functional portion.

In addition, the discard window is configured to be capable of accommodating parts when the attachment member is attached.
According to this configuration, it is possible to improve the layout as well as the complexity of the mold by making it possible to accommodate the components in the discard window, as compared with the case where the discard window and the accommodating hole for accommodating the components are formed separately. Can be suppressed. Therefore, further improvement in manufacturing efficiency and cost reduction can be achieved.

In addition, a plurality of the pedestal portions are formed on the substrate, and the extending direction of the throttle portion in one of the pedestal portions is a position that avoids the extending direction of the throttle portion in the other pedestal portion. It is characterized by being set.
According to this configuration, in the drawing process, the drawn parts are not pulled between the drawn parts of each pedestal part, so that the distortion of the pedestal part and the deformation of the substrate can be reliably suppressed.

The method for manufacturing a pressed part according to the present invention includes a board having a functional part, and a pedestal part that is disposed at a position recessed with respect to the board and is capable of contacting the attachment member when the board is attached to the attachment member. And a drawing part manufacturing method for connecting the pedestal part and the substrate, comprising: a drawing step of forming the drawing part by drawing the substrate; Before the drawing step, there is a punching step of forming a plurality of throwing windows at intervals along the circumferential direction of the pedestal portion forming region between the pedestal portion and the functional portion of the substrate. It is characterized by having.
According to this configuration, since the throwing window between the pedestal part and the functional part is deformed during the throttling step for forming the throttling part, the deformation around the throttling part is absorbed by the throwing window, and the substrate The deformation of itself can be suppressed. Therefore, it is possible to suppress the deformation in the squeezing step from reaching the function part, and thus it is possible to suppress the positional deviation of the function part. Therefore, it is possible to stably manufacture a non-defective product in which the functional unit is arranged at a desired position.
In this case, since the configuration is such that only the discard window is formed around the pedestal portion, it is not necessary to create a mold according to the amount of deviation as in the conventional case. Therefore, it is possible to improve manufacturing efficiency while suppressing an increase in manufacturing cost.

Moreover, it has the through-hole formation process which forms a through-hole in the said base part in the back | latter stage of the said narrowing-down process, It is characterized by the above-mentioned.
According to this configuration, by forming the through hole in the pedestal portion after the drawing step, the deformation of the substrate can be reliably suppressed when the through hole is formed.

  According to the press part and the press part manufacturing method according to the present invention, it is possible to improve manufacturing efficiency while suppressing an increase in manufacturing cost.

It is a top view of the press component in this embodiment. (A) is a perspective view of a pressed part, and (b) is an enlarged perspective view of part A of (a). It is sectional drawing which follows the BB line of FIG. It is explanatory drawing which shows the manufacturing method of a press component, Comprising: It is a perspective view of a board | plate material. It is explanatory drawing for demonstrating a drawing process, Comprising: It is sectional drawing of a board | plate material. It is sectional drawing of the conventional press part. It is a figure which shows the result of having analyzed the displacement to a Z direction, Comprising: It is a top view of the model A. FIG. It is a figure which shows the result of having analyzed the displacement to a Z direction, Comprising: It is a top view of the model B. FIG. It is a figure which shows the result of having analyzed the displacement to radial direction, Comprising: It is a top view of the model A. FIG. It is a figure which shows the result of having analyzed the displacement to radial direction, Comprising: It is a top view of the model B. FIG. It is a figure which shows the result of having analyzed the residual stress (equivalent stress), Comprising: It is a top view of the model A. FIG. It is a figure which shows the result of having analyzed the residual stress (equivalent stress), Comprising: It is a top view of the model B. FIG.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
(Press parts)
First, the press part in this embodiment is demonstrated. FIG. 1 is a plan view of a pressed part. 2A is a perspective view of a pressed part, and FIG. 2B is an enlarged perspective view of a portion A in FIG.
As shown in FIGS. 1 and 2, the press part 1 of the present embodiment is a date indicator holder that holds a date dial incorporated in, for example, a mechanical timepiece, a quartz timepiece, or the like, and is, for example, a disc shape made of phosphor bronze or the like. Is formed. Specifically, the press component 1 includes a disk-shaped substrate 2, a plurality of functional units (not shown) formed on the substrate 2, and a plurality of mounting portions 4 for fixing the press component 1 to a mounting member (not shown). Are integrally formed. The functional part is a hole or shape that is functionally important for incorporating the date indicator press as the press part 1 into the timepiece, and is formed in a state of being positioned at a desired position on the substrate 2.

(Mounting part)
FIG. 3 is a sectional view taken along line BB in FIG.
As shown in FIGS. 1-3, the attachment part 4 of this embodiment is formed in five places (attachment parts 4a-4e) in the position which avoided the radial direction center part of the board | substrate 2. As shown in FIG. In addition, since each attachment part 4a-4e is the substantially the same structure, when it is not necessary to distinguish each attachment part 4a-4e, it demonstrates as the attachment part 4 collectively. Moreover, in the following description, the attachment part 4a is demonstrated to an example among each attachment part 4a-4e.

The mounting portion 4 includes a pedestal portion 11 disposed at a position recessed with respect to the surface of the substrate 2 (front side in FIG. 1), a pair of bridge portions 12 that bridge the pedestal portion 11 and the substrate 2, and a pedestal. A plurality of throwing windows 13 surrounding the periphery of the portion 11.
The pedestal portion 11 is a disc-shaped member whose surface direction is arranged in parallel to the surface direction of the substrate 2, and a through hole 14 that penetrates along the thickness direction (axial direction) in the center portion in the radial direction. Is formed. A screw (not shown) is inserted into the through hole 14 from the surface side of the substrate 2. The press part 1 is fixed to the mounting member in a state where the back surface side of the pedestal portion 11 is in contact with the mounting member by screwing the screw into the female thread portion (not shown) of the mounting member described above. At this time, the head of the screw is housed inside the mounting portion 4 so as not to protrude from the surface side of the substrate 2. Further, there is a gap between the substrate 2 and the mounting member, and various components are arranged in this gap.

Each bridge portion 12 is a thin plate-like member extending radially from the outer peripheral edge of the pedestal portion 11 in plan view, and in the present embodiment, the pair of bridge portions 12 have the radial direction of the pedestal portion 11 as a symmetric line. It extends in line symmetry.
As shown in FIG. 3, each bridge portion 12 is formed in an L shape in a sectional view. Specifically, the bridge portion 12 is formed on one end side (inner side) in the extending direction and extends along the thickness direction of the pedestal portion 11 and on the other end side (outer side) in the extending direction. And an extending portion 16 extending along the radial direction of the pedestal portion 11.

  The drawn portion 15 is a portion of the bridge portion 12 that has been drawn. One end side in the extending direction is connected to the outer peripheral edge of the pedestal portion 11, and the other end side is connected to one end side of the extended portion 16. Yes. Specifically, the diaphragm 15 is gradually inclined outward as it goes from the pedestal 11 side to the substrate 2 side in a cross-sectional view. Furthermore, the connection part with the outer periphery of the base part 11 among the aperture | diaphragm | squeeze parts 15 is formed in the curved surface shape which bulges toward the outer side of the attachment part 4, and the connection part with the extension part 16 is the attachment part 4's. It is formed in a curved shape that bulges inward.

One end of the extending portion 16 in the extending direction is connected to the other end of the throttle portion 15, and the other end is connected to the substrate 2. The extending portion 16 is arranged on the same plane as the substrate 2 and is formed so as to gradually become wider from one end side in the extending direction toward the other end side.
Moreover, as shown in FIGS. 1-3, the bridge parts 12 of one attaching part 4 (for example, attaching part 4a) and the other attaching part 4 (for example, attaching part 4b) are bridge parts 12 respectively. It is arrange | positioned in the position which avoided the line on the extending direction. That is, between each attachment part 4, the bridge | bridging part 12 is arrange | positioned so that it may not oppose along each extension direction.

  Here, each of the above-described thrown-out windows 13 is arranged on the substrate 2 so as to block between the above-described functional unit and the pedestal unit 11. Specifically, each throw-away window 13 is formed in an arc shape extending in the circumferential direction of the pedestal portion 11 in plan view, and is disposed at intervals along the circumferential direction of the pedestal portion 11. Yes. The discard window 13 of the present embodiment is disposed at two locations facing each other in the radial direction with the pedestal portion 11 interposed therebetween, and the bridge portion 12 described above is disposed between the discard windows 13 along the circumferential direction of the pedestal portion 11. It is arranged.

  The angle range in the circumferential direction of the pedestal portion 11 is set equally between the pedestal portions 11 in the throw-away windows 13 of the mounting portions 4. In this case, the remaining ratio with respect to the entire circumferential direction of the pedestal portion 11, that is, the formation range of the bridge portion 12 with respect to the entire circumferential direction of the pedestal portion 11 is set to about 20%. If the formation range of the bridge portion 12 described above with respect to the entire circumferential direction of the pedestal portion 11 is too small, the strength of the bridge portion 12 may be insufficient, which is not preferable. On the other hand, if the above-described bridge portion 12 is formed in an excessively large range with respect to the entire circumferential direction of the pedestal portion 11, there is a possibility that deformation in the drawing step described later may reach the substrate 2.

  Further, among the mounting portions 4, the discard windows 13 of the mounting portions 4 a, 4 b, 4 e extend in line symmetry with the radial direction of the pedestal portion 11 as a symmetric line. On the other hand, in each of the attachment portions 4, each of the discard windows 13 of the attachment portions 4 c and 4 d is formed such that the other discard windows 13 c and 13 d are larger than the one discard window 13. In this case, the other throw-away windows 13c and 13d also have a function as an accommodation hole for accommodating a component (for example, an operating lever or the like) when assembled on the timepiece.

  As shown in FIGS. 2 and 3, the outer peripheral edge of the narrowed portion 15 in the bridge portion 12 is disposed on the inner side along the radial direction of the pedestal portion 11 with respect to the outer peripheral edge of the throwing window 13 in plan view. In this case, the distance between the outer peripheral edges of the thrown away windows 13 that pass through the center of the pedestal portion 11 in the radial direction (outer diameter D1 of the thrown away window 13) is the respective diaphragms that pass through the center of the pedestal portion 11 and face in the radial direction. It is preferable to set the distance 15% or more larger than the distance between the outer peripheral edges of the portion 15 (the outer diameter D2 of the throttle portion 15). On the other hand, the distance between the inner peripheral edges of the thrown away windows 13 that pass through the center of the pedestal part 11 in the radial direction (the inner diameter D3 of the thrown away window 13) is the respective throttle parts 15 that pass through the center of the pedestal part 11 and face in the radial direction. Is set equal to the distance between the inner peripheral edges (inner diameter D4 of the throttle portion 15).

(Pressed parts manufacturing method)
Next, the manufacturing method of the press part 1 mentioned above is demonstrated. In addition, the manufacturing method of the press part 1 of this embodiment uses the progressive die which respectively provided the punch and die | dye corresponding to each process in one type | mold. In the following description, a method will be described in which a plate material 51 (hoop material) formed by winding a phosphor bronze plate is sequentially pressed while being conveyed, and finally the pressed part 1 is cut from the plate material 51 and taken out. FIG. 4 is an explanatory view showing a method for manufacturing a pressed part, and is a perspective view of a plate material.
First, as shown in FIG. 4A, an outer shape punching process is performed in which the outer shape of the pressed part 1 is punched from the plate material 51. Thereby, the plate material 51 is in a state in which the product portion 52 of the press part 1 and the outer frame portion 53 surrounding the product portion 52 are connected to each other through the connecting portion 54 in a part in the circumferential direction. Note that the outer shape punching step may be performed before the cutting step described later.

  Next, a punching process for forming each functional unit and the discard window 13 is performed on the product portion 52. Specifically, in the product portion 52, the functional portion in the press part 1 and the area corresponding to the throwing window 13 are punched out. In this case, between the respective disk portions 55 that will later become the pedestal portions 11 of the press part 1 and the functional portions, the discard windows 13 that are opposed in the radial direction with the respective disk portions 55 interposed therebetween are formed. . Furthermore, each disk part 55 will be in the state respectively connected by the pair of bridge parts 12. FIG.

FIG. 5 is an explanatory diagram for explaining the drawing step, and is a cross-sectional view of a plate material.
Next, as shown in FIGS. 4B and 5A, a drawing process is performed in which drawing processing is performed on one end side (inside) in the extending direction of the bridge portion 12 in the product portion 52. Specifically, drawing is performed on one end side in the extending direction of the bridge portion 12 using a punch 61 having a smaller outer diameter than the outer diameter D1 of the throwing window 13 and a die 63 having a die hole 62 having a smaller inner diameter. Do. Then, as shown in FIGS. 4B and 5B, the bridge portion 12 is sandwiched between the punch 61 and the die hole 62, and the bridge portion 12 has an outer surface shape of the punch 61 and an inner surface shape of the die hole 62. It is narrowed down according to. Thereby, the disk part 55 becomes the base part 11 arrange | positioned in the position depressed with respect to the surface of the product part 52.

Subsequently, as shown in FIG. 4C, a through hole forming process for forming the through hole 14 is performed by punching out the radial center portion of the pedestal portion 11 (disk portion 55). Thereby, the attachment part 4 mentioned above is formed.
Finally, the connecting portion 54 is cut to separate the product portion 52 and the outer frame portion 53.
The press part 1 mentioned above is completed by the above.

As described above, in the above-described embodiment, a plurality of the discard windows 13 are formed between the pedestal portion 11 and the functional portion of the substrate 2 at intervals along the circumferential direction of the pedestal portion 11 and discarded. The diaphragm 15 is arranged between the windows 13.
According to this configuration, the throwing window 13 between the pedestal portion 11 and the functional portion is deformed during the throttling step described above, so that the deformation around the throttling portion 15 is absorbed by the throwing window 13. The deformation of the substrate 2 itself can be suppressed. Therefore, it is possible to suppress the deformation in the squeezing step from reaching the function part, and thus it is possible to suppress the positional deviation of the function part. Therefore, it is possible to stably manufacture a non-defective product in which the functional unit is arranged at a desired position.
In this case, since only the discard window 13 is formed around the pedestal 11, work such as creating a mold in accordance with the amount of deviation as in the prior art becomes unnecessary. Therefore, it is possible to improve manufacturing efficiency while suppressing an increase in manufacturing cost.

By the way, at the time of drawing, the tensile force in the thickness direction of the substrate 2 acting on the drawing portion 15 also acts on the outside of the drawing portion 15, and the outer peripheral portion of the substrate 2 is displaced to the side opposite to the drawing portion 15. Therefore, there is a possibility that the entire substrate 2 is warped.
On the other hand, according to this embodiment, it can suppress that the tension | tensile_strength mentioned above acts outside the discarding window 13, and can also suppress the curvature of the board | substrate 2 whole.
In addition, the tensile force in the thickness direction of the substrate 2 and the compressive force in the radial direction that are applied when the substrate 2 is narrowed easily act along the radial direction of the substrate 2. By making it oppose along a radial direction, the tensile force and compressive force which were mentioned above can be absorbed effectively.

In addition, according to the present embodiment, by forming the two discard windows 13 at intervals along the circumferential direction of the pedestal portion 11, the pedestal portion 11 can be stabilized by the throttle portion 15 (bridge portion 12). In addition, it is possible to reliably suppress the deformation in the drawing process from reaching the substrate 2 and the functional unit. In addition, since the complexity of the mold can be suppressed as compared with a case where there are too many throttle portions 15 (a plurality of cases where there are three or more locations), further improvement in manufacturing efficiency and cost reduction can be achieved.
Furthermore, according to the present embodiment, by arranging the throttle part 15 (bridge part 12) symmetrically with the pedestal part 11 in between, the deformation of the throwing window 13 becomes uniform in the throttle process. Therefore, the drawing process can be performed with high accuracy, and the distortion of the pedestal 11 and the deformation of the substrate 2 can be reliably suppressed.

In addition, according to the present embodiment, by arranging the outer peripheral edge of the throttle portion 15 on the inner side of the outer peripheral edge of the throwing window 13, it is possible to reliably suppress the deformation in the throttle process from reaching the substrate 2 and the functional portion. .
Further, since the bridge portions 12 of the attachment portions 4 are arranged at positions avoiding the lines along the extending direction of the bridge portions 12, they are pulled between the drawn portions 15 of the bridge portions 12 in the drawing process. It does n’t fit. Therefore, the distortion of the base part 11 and the deformation | transformation of the board | substrate 2 can be suppressed reliably.

Moreover, in this embodiment, since the discard windows 13c and 13d, for example, of the thrown-out windows 13 function as accommodating holes for accommodating components, compared to the case where the discarded windows 13c and 13d and the accommodated holes are formed separately. Thus, layout can be improved and complexity of the mold can be suppressed. Therefore, further improvement in manufacturing efficiency and cost reduction can be achieved.
Further, in the present embodiment, by forming the through hole 14 in the pedestal portion 11 after the drawing step, the deformation of the substrate 2 can be reliably suppressed when the through hole 14 is formed.

(Example)
The present invention will now be described with reference to examples.
The inventor of the present application has analyzed the influence of the press part 1 when the above-described drawing process is performed depending on the presence or absence of the discard window 13. Specifically, in this analysis, a press part 1 (hereinafter referred to as model A) in which the discard window 13 is formed as in the above-described embodiment and a conventional press part (hereinafter referred to as model A) in which the discard window 13 is not formed. The model B) was subjected to the drawing process described above, and the subsequent displacement in the thickness direction (Z direction) and radial direction of the substrate 2 and the residual stress on the substrate 2 were analyzed. Incidentally, the elongated portion Q in the upper part of FIGS. 7 to 12 described below is likely to cause an error in analysis due to its elongated shape. In particular, the numerical value of the elongated portion Q is large in FIGS. The deviation is large. Therefore, in this analysis, the analysis result of the elongated portion Q is ignored.

The processing conditions of the drawing process in this analysis are as follows.
・ Wrinkle holding force: 42 [kgf]
・ Punch protrusion (drawing depth): 0.24 [mm]
・ Punch material: 64 Brass

7 and 8 are diagrams showing the results of analyzing the displacement in the Z direction, in which FIG. 7 is a plan view of model A, and FIG. 8 is a plan view of model B. In the drawings shown below, the same reference numerals are given to the configurations corresponding to the above-described embodiments. In the following description, the thickness direction of the substrate 2 is the Z direction, and the die 63 side (bottom side of the mounting portion 4) in the Z direction is the + Z direction, and the punch 61 side (opening side of the mounting portion 4) is −. Let it be the Z direction. Furthermore, in the following description, the through hole H is formed in the radial center of the substrate 2 as one of the functional parts. Therefore, among the mounting portions 4, with respect to the mounting portions 4 a, 4 b, and 4 d, a throw window 13 is formed between the pedestal portion 11 and the functional portion.
As shown in FIG. 8, when the drawing process is performed under the above-described processing conditions, the displacement in the −Z direction is large particularly in the outer peripheral portion of the substrate 2, and as a result, the entire substrate 2 is warped in the + Z direction. As a result. In the model B, the maximum displacement in the −Z direction was 0.0316 [mm] in the P1 ′ portion of the outer peripheral portion of the substrate 2. This is because the wrinkle pressing is performed during the drawing process, but the tensile force in the Z direction acting on the drawing portion 15 also acts on the outside of the drawing portion 15, and is on the punch 61 side on the outer peripheral portion of the substrate 2. This is considered to be because warpage occurs in the −Z direction.

  On the other hand, in the model A shown in FIG. 7, the displacement in the −Z direction occurs in the outer peripheral portion of the substrate 2 as in the conventional structure described above, but the displacement is small, for example, 0.021 [ mm]. This is because in Model A, the discard window 13 is formed around the pedestal 11, so that the above-described tensile force can be prevented from acting outside the discard window 13 during the drawing process. It is done.

9 and 10 are diagrams showing the results of analyzing the displacement in the radial direction, in which FIG. 9 is a plan view of model A, and FIG. 10 is a plan view of model B. In the following description, the radial direction of the substrate 2 is the R direction, and among the R directions, the direction toward the outer peripheral portion is the + R direction, and the direction toward the through hole H is the -R direction.
As shown in FIG. 10, when the drawing process is performed under the above-described processing conditions, the displacement of the drawing portion 15 on both sides along the R direction with respect to the pedestal portion 11, the peripheral portion of the pedestal portion 11, etc. is particularly large. As a result, the displacement on the −R direction side with respect to the pedestal portion 11 was increased. This is considered to be because the peripheral portion of the pedestal part 11 is drawn toward the inner side of the pedestal part 11 due to the compressing force acting toward the inner side of the pedestal part 11 by performing the drawing process. In the model B, the maximum displacement in the R direction was +0.0731 [mm] in the P2 ′ portion of the substrate 2.

  On the other hand, in the model A shown in FIG. 9, as in the conventional structure described above, although the displacement in the Z direction occurs in the aperture portion 15 and the peripheral portion of the base portion 11, the displacement is small. Recognize. In particular, the displacement in the −R direction was hardly observed with respect to the attachment portions 4a, 4b, and 4d in which the discard window 13 is formed between the pedestal portion 11 and the functional portion among the attachment portions 4. This is considered to be because, in the model A, the discard window 13 is formed around the pedestal 11, and thus the compression force described above can be prevented from acting outside the discard window 13 in the drawing process. . In the model A, the maximum displacement in the R direction was +0.0638 [mm] at the P2 portion of the mounting portion 4c.

11 and 12 are diagrams showing the results of analyzing the residual stress (equivalent stress), in which FIG. 11 is a plan view of model A and FIG. 12 is a plan view of model B. 11 and 12 show a state after the springback.
As shown in FIG. 12, when the drawing process is performed under the above processing conditions, it can be seen that residual stress is accumulated over a wide range around the mounting portion 4. In Model B, since the entire periphery surrounding the pedestal portion 11 is plastically deformed as the constricted portion 15, it is considered that the residual stress is increased by restraining each other around the periphery. In such a case, it may cause an attempt to restore the original shape or cause a delayed fracture due to a subsequent temperature change or the like. The maximum value of residual stress in model B was 639 [MPa].

  On the other hand, in the model A shown in FIG. 11, as in the conventional structure described above, although the residual stress is accumulated in the mounting portion 4, most of the range is only the pedestal portion 11 and the bridge portion 12. Recognize. For this reason, in the substrate 2, it can be seen that almost no residual stress is accumulated in a region outside the throw window 13 with respect to the pedestal portion 11. This is thought to be because the compressive force and tensile force acting during the squeezing process can be prevented from extending outside the throwing window 13. In addition, since the discard windows 13 are formed on both sides in the circumferential direction of the narrowed portion 15, it is considered that restraining around each other when plastically deforming as the narrowed portion 15 can be suppressed. The maximum residual stress in model A was 573 [MPa].

  As described above, the operational effects of the present embodiment can be actually confirmed by actual analysis, and the special operational effects that cannot be achieved by the conventional structure can be achieved.

As described above, the technical scope of the present invention is not limited to the embodiment described above, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above-described embodiment, the case where the date dial holder is adopted as an example of the press part 1 has been described. However, the present invention is not limited to this and can be adopted for various press parts.
Moreover, although the embodiment mentioned above demonstrated the case where the through-hole 14 for inserting a screw | thread to the base part 11 was formed, the through-hole 14 does not need to be formed. In any case, it is only necessary that the pedestal portion 11 that is recessed with respect to the substrate 2 and the throttle portion 15 that connects the pedestal portion 11 and the substrate 2 are formed.
In addition, the shape and quantity of the throttle part 15 and the discard window 13 can be appropriately changed.
Further, in the above-described embodiment, the case where the progressive die is used and the press part 1 is continuously formed has been described. However, the present invention is not limited to this. For example, a transfer die or a single die may be used. I do not care.

DESCRIPTION OF SYMBOLS 1 ... Press part 2 ... Board | substrate 4, 4a-4e ... Mounting part 11 ... Base part 13 ... Throwing-out window 14 ... Through-hole 15 ... Restriction part 51 ... Plate material

Claims (8)

A substrate having a functional part;
A pedestal portion that is disposed at a position recessed with respect to the substrate and is capable of contacting the mounting member when the substrate is mounted on the mounting member;
In a pressed part having a squeezing part connecting the base part and the substrate,
Between the pedestal portion and the functional portion of the substrate, a plurality of throwing windows extending at intervals along the circumferential direction of the pedestal portion are formed, and the throttle portion is the throwing window. A plurality of the pedestal portions are formed on the substrate,
The pressing part, wherein an extending direction of the throttle part in one of the pedestal parts is set at a position avoiding an extending direction of the throttle part in the other pedestal part.   The press part according to claim 1, wherein the discard window is formed at two positions with a gap along a circumferential direction of the pedestal portion.   3. The press part according to claim 2, wherein the discard window is opposed along the radial direction of the substrate with the pedestal portion interposed therebetween.   The press part according to claim 3, wherein the narrowed portion is disposed symmetrically with the pedestal portion interposed therebetween.   The press part according to any one of claims 1 to 4, wherein an outer end portion along an extending direction of the narrowed portion is disposed inside an outer peripheral edge of the throwing window. .   The press part according to any one of claims 1 to 5, wherein the discard window is configured to be able to receive a part when the attachment member is attached. A substrate having a functional part;
A pedestal portion that is disposed at a position recessed with respect to the substrate and is capable of contacting the mounting member when the substrate is mounted on the mounting member;
Have a a throttle portion for connecting the substrate and the pedestal portion, the extending direction of the narrowed portion of one of said base portion, to avoid the extending direction of the narrowed portion in the other of said base portion A method of manufacturing a pressed part set at a position ,
A drawing process for forming the drawn portion by drawing the substrate;
Before the drawing step, there is a punching step of forming a plurality of throwing windows at intervals along the circumferential direction of the pedestal portion forming region between the pedestal portion and the functional portion of the substrate. A method for producing a pressed part, characterized in that: 8. The method for manufacturing a pressed part according to claim 7 , further comprising a through hole forming step of forming a through hole in the pedestal portion after the drawing step.

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