CN114433780A

CN114433780A - Surface mount nut, method and apparatus for manufacturing the same, and method for manufacturing bottomed cylindrical body

Info

Publication number: CN114433780A
Application number: CN202110706387.2A
Authority: CN
Inventors: 高木孝司
Original assignee: Tps Corp
Current assignee: Tps Corp
Priority date: 2020-11-02
Filing date: 2021-06-24
Publication date: 2022-05-06
Also published as: KR20220059394A; JP2022073911A; JP6955123B1; KR102660378B1

Abstract

The invention provides a surface mount nut, a method and an apparatus for manufacturing the same, and a method for manufacturing a bottomed cylindrical body, which can easily reduce the number of steps and improve the dimensional accuracy of a hole even when a relatively deep hole is provided. A manufacturing method of manufacturing a bottomed tubular surface mount nut from a metal material, the bottomed tubular surface mount nut having a screw hole opened upward and being capable of welding a bottom surface portion to a mounting surface, the manufacturing method including: a hole forming step of driving a punch from above into the metal material provided with a base having a hole portion at a lower side thereof, and forming a hole having an upper surface of the pressed portion as a bottom in the metal material by causing a part of the pressed portion to protrude from a lower surface of the metal material into the hole portion; and a screw hole machining step of machining the formed hole into the screw hole.

Description

Surface mount nut, method and apparatus for manufacturing the same, and method for manufacturing bottomed cylindrical body

Technical Field

The present invention relates to a method for manufacturing a surface mount nut, an apparatus for manufacturing a surface mount nut, a method for manufacturing a bottomed cylindrical body, and a surface mount nut.

Background

Surface mount nuts have been conventionally used for, for example, applications of connecting substrates to each other. The surface mount nut is provided with a screw hole, is fixed to one of the connection objects (mounting surfaces) by welding, and can connect the two by screwing the other connection object. Patent document 1 discloses a surface mount nut mounted on a printed wiring board of an electronic device, in which a film is attached to a lower surface of the surface mount nut including a screw hole.

[ Prior art documents ]

[ patent document ]

[ patent document 1] Japanese patent laid-open No. 2007-35992

Disclosure of Invention

[ problems to be solved by the invention ]

In the aspect of firmly fixing the bottom surface of the surface mount nut to the mounting surface by welding, a bottomed cylindrical shape capable of enlarging the area of the bottom surface is desired as compared with a cylindrical shape having a hole penetrating through the bottom surface. Such a surface mount nut can be considered as one of metal bottomed cylinders.

As a method for producing a metal bottomed tubular body, for example, a method of forming a bottomed hole by deep drawing and drawing is cited. However, in the deep drawing, when a relatively deep hole is provided, many steps are required to gradually increase the deep hole. Further, the deep drawing press working may cause a problem in terms of the dimensional accuracy of the hole.

In view of the above-described problems, an object of the present invention is to provide a method for manufacturing a surface mount nut, an apparatus for manufacturing a surface mount nut, and a method for manufacturing a bottomed cylindrical body, in which the number of steps can be easily reduced and the dimensional accuracy of a hole can be improved even when a relatively deep hole is provided.

[ means for solving problems ]

A method of manufacturing a surface mount nut according to the present invention is a method of manufacturing a bottomed tubular surface mount nut from a metal material, the bottomed tubular surface mount nut having a screw hole opened upward and being capable of welding a bottom surface portion to a mounting surface, the method including: a hole forming step of driving a punch from above into the metal material provided with a base having a hole portion at a lower side thereof, and forming a hole having an upper surface of the pressed portion as a bottom in the metal material by causing a part of the pressed portion to protrude from a lower surface of the metal material into the hole portion; and a screw hole machining step of machining the formed hole into the screw hole. According to the manufacturing method, even when a relatively deep hole is provided, the number of steps can be reduced and the dimensional accuracy of the hole can be improved easily.

More specifically, the manufacturing method may be a manufacturing method in which the outer edge of the hole is disposed inward of the outer edge of the punch in a plan view. According to the present manufacturing method, it is easy to appropriately provide a portion of the bottom while utilizing a portion of the pressed portion as the bottom of the hole.

More specifically, the manufacturing method may be a manufacturing method in which the outer edge of the hole has a polygonal shape in a plan view. More specifically, the manufacturing method may include a cutting and removing step of cutting and removing the protruding portion of the metal material, and a step of pressing a predetermined region of the lower surface of the metal material including a portion where the cutting is performed upward in a front view.

More specifically, the manufacturing method may include a cutting and removing step of cutting and removing a lower portion of the metal material at a position above the lower surface and below the upper surface, and the surface to be cut may be the bottom surface portion. According to the present manufacturing method, it is easy to appropriately provide a portion of the bottom while utilizing a portion of the pressed portion as the bottom of the hole. The phrase "the surface subjected to the cutting is the bottom surface portion" also includes the case where the "cut surface" is subjected to a surface treatment such as a plating treatment, and the case where the "cut surface" is the bottom surface portion ".

More specifically, the manufacturing method may include a step of chamfering an upper end portion of the side wall of the hole by C. The apparatus for manufacturing a surface mount nut according to the present invention is configured to manufacture the surface mount nut by the manufacturing method. According to this configuration, the advantages of the manufacturing method of the present invention can be enjoyed.

A method for manufacturing a bottomed cylindrical body according to the present invention is a method for manufacturing a bottomed cylindrical body having a hole opened upward from a metal material, the method including: a hole forming step of driving a punch from above into the metal material having a base having a hole formed in a lower side thereof, and forming a hole in the metal material with an upper surface of the pressed portion as a bottom, such that a part of the pressed portion protrudes from a lower surface of the metal material into the hole; and a cutting and removing step of cutting and removing a lower portion of the metal material at a position above the lower surface and below the upper surface.

A method for manufacturing a bottomed cylindrical body according to the present invention is a method for manufacturing a bottomed cylindrical body having a hole opened upward from a metal material, the method including: and a hole forming step of driving a punch from above into the metal material having a base having a hole formed in a lower side thereof, and forming a hole in the metal material with a bottom surface of the pressed portion projecting from a lower surface of the metal material into the hole, wherein an outer edge of the hole is disposed more inward than an outer edge of the punch in a plan view. According to the present manufacturing method, it is easy to appropriately provide a portion of the bottom while utilizing a portion of the pressed portion as the bottom of the hole.

The surface mount nut according to the present invention is a bottomed cylindrical surface mount nut having a screw hole opened upward and capable of welding a bottom surface portion to a mounting surface, and is provided with a locking portion capable of removing a portion below the screw hole. According to this configuration, the locking portion can be removed as necessary and used in a state of penetrating the lower side of the screw hole. In the above configuration, more specifically, a boundary between the latch portion and a portion other than the latch portion in the bottom portion may be visible.

[ Effect of the invention ]

According to the method of manufacturing a surface mount nut of the present invention, even when a relatively deep hole is provided, the number of steps can be easily reduced and the dimensional accuracy of the hole can be easily improved.

Drawings

Fig. 1 is a perspective view of a surface mount nut 1 manufactured by the manufacturing method of the present embodiment.

Fig. 2 is an explanatory diagram of an example of a specific form of the surface mount nut 1.

Fig. 3 is a schematic flowchart of a method of manufacturing the surface mount nut 1.

Fig. 4 is an explanatory view of the metal plate material 2 used for manufacturing the surface mount nut 1.

Fig. 5 is an explanatory diagram of the case where the hole forming step S12 is performed.

Fig. 6 is an explanatory diagram of the case where the hole forming step S12 is performed.

Fig. 7 is an explanatory diagram of the respective steps after the cutting removal step S13.

Fig. 8 is an explanatory diagram of the cutting removal step S13.

Fig. 9 is an explanatory diagram of a modification of the manufacturing method of the present embodiment.

Fig. 10 is a perspective view of the metal plate member 2 shown in fig. 9.

Fig. 11 is a perspective view of the metal plate member 2 shown in fig. 9 viewed from another angle.

Fig. 12 is an explanatory view of the size of the metal plate material.

Fig. 13 is an explanatory view of the size of the metal plate member.

Fig. 14 is an explanatory diagram of a case where the form of the through hole of the chassis is changed.

Fig. 15 is an explanatory diagram of a case where the form of the through hole of the chassis is changed.

Fig. 16 is an explanatory diagram of a case where the form of the through hole of the chassis is changed.

Fig. 17 is an explanatory view of a surface mount nut having a portion protruding from a bottom surface portion.

Fig. 18 is an explanatory diagram of the face mount nut to which the pressing step has been applied.

[ description of symbols ]

1: face mounting nut

11: threaded hole

12: c chamfer part

13: locking part

15: bottom surface part

16: upper surface part

2: metal plate material

21: metal material

21 a: push down part

21 b: hole(s)

And Ja: base seat

Ja 1: a first base part

Ja 2: second base part

Jb: demoulding device

Jb 1: a first stripper part

Jb 2: second ejector part

Jc: punch head

Detailed Description

Hereinafter, a method for manufacturing a surface mount nut (reflow nut) according to an embodiment of the present invention will be described with reference to the drawings. The vertical direction of the surface mount nut coincides with the axial direction of the screw hole, and the side of the screw hole opening (the side into which the screw thread is fitted) is set to the upper side.

Fig. 1 is a perspective view of a surface mount nut 1 manufactured by the manufacturing method of the present embodiment. The surface mount nut 1 is a bottomed tubular component having a threaded hole 11 opened upward in a rectangular metal body having upper, lower, left, right, front, and rear surfaces, and having a bottom surface portion 15 weldable to a mounting surface. The center axis of the screw hole 11 passes through the center position in the plan view of the surface mount nut 1 and extends in the vertical direction. The upper end of the side wall of the screw hole 11 is a portion (C-chamfered portion 12) subjected to C-chamfering of about C0.15.

As an example of a method of using the surface mount nut 1, a connection substrate provided with a through hole is connected to a mounting substrate. In this case, the surface mount nut 1 first fixes the bottom surface portion 15 to the upper surface (mounting surface) of the mounting substrate by welding. Then, the connection substrate is mounted on the upper surface portion 16 so that the through hole is positioned on the screw hole 11. In the assembled state, screws are inserted from the connection substrate into the threaded holes 11 and tightened. Thereby, the connection substrate is fixed to the upper surface portion 16 of the surface mount nut 1 by screwing.

Here, focusing on the fixation between the mounting board and the surface mount nut 1, since the fixation is achieved by welding, it is not necessary to provide a hole for screwing the surface mount nut 1 on the mounting board, for example. Therefore, restrictions such as component mounting in the mounting substrate provided with the hole do not occur, and the degree of freedom in product design is improved.

In the surface mount nut 1, the screw hole 11 does not penetrate through to the bottom surface portion 15, and accordingly, the area of the bottom surface portion 15 increases. Therefore, compared to the case where the screw hole 11 is assumed to penetrate to the bottom surface portion 15, the area of the mounting surface to which the welding is performed is increased, and the peel strength (difficulty in peeling) of the welding is improved. Further, even when the solder paste is applied to the bottom surface portion 15 and soldered, the screw hole 11 does not penetrate through the bottom surface portion 15, and therefore, the solder paste is prevented from entering the screw hole 11 from below. Further, since the screw hole 11 does not penetrate through the bottom surface portion 15, the surface mount nut 1 is easily lifted from the upper side by vacuum suction, and workability in transportation and the like is also excellent.

Further, since the surface mount nut 1 has a large contact area with the mounting substrate, the resistance therebetween can be reduced or the heat dissipation characteristics can be improved. Even when these components are mounted on a communication device such as a smartphone, the ground (ground) performance can be improved by reducing the resistance as much as possible, and the effect of reducing noise in a high frequency band is exerted. In addition, since the lower side of the screw hole 11 is locked, the screw inserted into the screw hole 11 can be prevented from being mistakenly contacted with the mounting substrate and damaged.

Fig. 2 shows a front view, a plan view, and an X-X cross-sectional view (a view of an X-X cross section shown in the front view) of an example of a specific form of the surface mount nut 1. As shown in the sectional view, the lower side of the screw hole 11 is closed by a closing portion 13.

In the example shown in fig. 2, the surface mount nut 1 has a vertical dimension S1 of about 1.5mm, a horizontal dimension S2 of about 2mm, and a longitudinal dimension S3 of about 1.2 mm. The depth S4 of the screw hole 11 is about 1.3mm, and the thickness S5 of the latch 13 forming the bottom of the screw hole 11 is about 0.2 mm. Further, the threaded hole 11 is formed in a size of M0.8. However, the specific shape and size of the surface mount nut 1 are not particularly limited.

Next, a method for manufacturing the surface mount nut 1 will be described. Here, a description of surface treatment including plating treatment and the like is omitted.

Fig. 3 is a schematic flowchart of a method of manufacturing the surface mount nut 1. The manufacturing method shown in fig. 3 is a manufacturing method for manufacturing the surface mount nut 1 from a metal material, and is a method for sequentially performing the fitting step S11, the hole forming step S12, the cutting and removing step S13, the C chamfering step S14, the screw hole machining step S15, and the finishing step S16. However, a part of the manufacturing method may be modified within a range that does not affect the manufacturing of the surface mount nut 1.

The mounting step S11 is a step of mounting the metal plate member 2 shown in fig. 4 on a manufacturing apparatus (hereinafter, sometimes referred to as a manufacturing apparatus J) for the surface mount nut 1. For ease of understanding, the light-colored portion of the metal plate member 2 shown in fig. 4 and later indicates a portion of the metal member 21 that is the base of the surface mount nut 1. A hole 22 for fitting a base Ja described later is provided in the metal plate member 2 below the metal member 21. The metal plate member 2 is formed such that portions having the same shape as the metal member 21 and the holes 22 are arranged in the left-right direction.

In the example of the present embodiment, the manufacturing apparatus J automatically performs a series of steps after the hole forming step S12 so that the regions in which one or more steps are performed are sequentially arranged and the portion of the metal sheet 2 on which the step is performed in a certain region is fed to the region of the next step.

The hole forming step S12 is a step of: a punch is driven from above into a metal material 21 provided with a base having a hole portion on the lower side, a part of a pressed portion (hereinafter, sometimes referred to as a "pressing portion") is projected from the lower surface, and a hole having the upper surface of the pressing portion as the bottom is formed in the metal material 21.

Fig. 5 schematically shows a case where the hole forming process S12 is performed. Fig. 5 shows the steps in order from the upper side, and a side view, a front view, and a cross-sectional view (a cross-sectional view when the metal plate member 2 is cut along a plane that divides the front and rear portions into two parts) in order from the left side. As shown in this figure, the manufacturing apparatus J includes a base Ja including a first base portion Ja1 and a second base portion Ja2, an ejector Jb including a first ejector portion Jb1 and a second ejector portion Jb2, and a punch Jc. Fig. 6 schematically shows a state where the second pedestal portion Ja2 and the second ejector portion Jb2 are moved forward from the state of fig. 5 (c).

First, as shown in fig. 5 (a), a base Ja, a knockout Jb, and a punch Jc of a manufacturing apparatus J are attached to a metal plate member 2. The base Ja is assembled such that the first base portion Ja1 moves backward and the second base portion Ja2 moves forward, and they are brought into contact with the inside of the hole 22 and closely contact the lower side of the metal member 21. The ejector Jb is assembled by bringing the first ejector part Jb1 into backward movement and the second ejector part Jb2 into forward movement, into contact with each other on the upper side of the metal material 21.

The punch Jc is formed in a cylindrical shape, a through hole Jah (corresponding to a hole of the present invention) having a circular cross section and a diameter substantially equal to that of the punch Jc is formed in the base Ja to which the punch Jc is attached, and a through hole Jbh having a circular cross section and a diameter substantially equal to that of the punch Jc is formed in the ejector Jb to which the punch Jc is attached. The central axes of the punch Jc and the through holes Jah and Jbh coincide with each other, and the central axis passes through the center of the metal material 21 in a plan view.

In this state, as shown by a dotted arrow in fig. 5 (a), the manufacturing apparatus J drives the punch Jc downward through the through hole Jbh. Thereby, as shown in fig. 5 (b), the lower portion of the punch Jc in the metal material 21 is pushed out to the through hole Jah. The punch Jc is driven to stay above the lower surface of the metal material 21, and the lower portion (pressing portion 21a) of the punch Jc in the metal material 21 is pressed down more than the other portions of the metal material 21.

Then, the manufacturing apparatus J moves the punch Jc upward as indicated by a dotted arrow in fig. 5 (b), and returns to the original position as shown in fig. 5 (c). Further, a hole 21b is formed in the metal material 21 by being extruded from the lower portion 21 a. Then, as shown in fig. 5 (d), the combination of the base Ja, the ejector Jb, and the punch Jc is released. The portion of the metal sheet member 2 subjected to the hole forming step S12 is subjected to the subsequent steps in sequence. This will be described in more detail with reference to fig. 7 and the like. Fig. 7 is a plan view, a front view, and a cross-sectional view (a cross-sectional view when the metal plate member 2 is cut along a plane that bisects the front and rear portions) in this order from the top.

Fig. 7 (a) shows a portion of the metal plate member 2 after the hole forming step S12 is performed. In the cutting and removing step S13, the manufacturing apparatus J cuts and removes the portion of the metal plate-like material 2 corresponding to the dotted frame β by cutting with the cutter moving in the front-rear direction. Here, the upper edge of the dotted line frame β is positioned above the lower surface of the metal material 21 and below the upper surface of the pressing portion 21 a. That is, the cutting and removing step S13 is a step of cutting and removing a lower portion of the metal material 21 (including the pressed portion 21a and other portions) at a position above the lower surface of the metal material 21 and below the upper surface of the pressed portion 21 a. Thus, a part of the push-down portion 21a can be used as the bottom (the locking portion 13) of the hole 21b, and the bottom surface 15 of the surface mount nut 1 can be formed by flattening the lower surface of the metal material 21.

If it is assumed that the cutting-out step S13 is performed by a general method, the portion of the dotted line frame β shown in fig. 7 is cut out instead of the portion of the dotted line frame β shown in fig. 8, for example, so that only the unnecessary portion 21a is removed. However, in this case, it may be difficult to appropriately provide the latch portion 13 corresponding to the bottom of the hole 21 b.

That is, if only the excess push-down portion 21a is cut and removed, a step or the like is generated between the cut surface generated by the cutting and the lower surface (excluding the cut surface) of the metal material 21, and the bottom surface portion 15 (surface for welding) of the surface mount nut 1 becomes uneven, and there is a possibility that the welding of the surface mount nut 1 cannot be performed properly. In this respect, in the present embodiment, since the entire lower portion of the metal material 21 including the excess pressed portion 21a is cut off, the entire lower surface of the metal material 21 is easily flattened, and the flat bottom surface portion 15 is easily obtained.

In addition, as in the present embodiment, when the bottom of the hole 21b is made thin in order to sufficiently secure the depth of the hole 21b, if only the excess push-down portion 21a is cut and removed, it is necessary to make the portion of the push-down portion 21a on the upper side of the lower surface of the metal material 21 (the portion remaining as the locking portion 13 without being removed) extremely short. Therefore, when the cutting and removing step S13 is performed, the portion may be accidentally detached from the metal material 21 due to an impact or the like at the time of cutting. In this respect, in the present embodiment, the portion of the hold-down portion 21a on the upper side of the lower surface of the metal material 21 can be made relatively long, and accordingly, when the cutting and removing step S13 is performed, the portion can be prevented from being unintentionally detached.

In the C chamfering step S14, the manufacturing apparatus J performs C chamfering on the upper end portions of the side walls of the holes 21 b. Fig. 7 (b) shows the portion of the metal plate-like material 2 on which the cutting and removing step S13 and the C chamfering step S14 have been performed.

In the screw hole machining step S15, the manufacturing apparatus J performs tapping by using a tool schematically shown by a dotted line γ in fig. 7 to machine the hole 21b into a screw hole. This makes it possible to obtain the screw hole 11 of the surface mount nut 1. In the example of the present embodiment, the tapping process of M0.8 was performed on the hole 21b having a diameter of 0.7 mm. Fig. 7 (c) shows a portion of the metal plate-like material 2 on which the screw hole machining step S15 is completed. In the finishing step S16, the manufacturing apparatus J cuts the metal sheet 2 at a position indicated by a dotted line δ in fig. 7. In this way, the surface mount nut 1 based on the metal material 21 can be obtained.

As a method for manufacturing the surface mount nut 1 from the metal plate member 2, although the steps similar to the steps S11 to S16 are performed, a manufacturing method in which the driving direction of the punch is deviated by 90 ° may be employed. Fig. 9 shows the state of the metal plate member 2 when the above method is employed. Fig. 9 (a) shows a portion of the sheet metal member 2 after the hole forming step S12 is performed, fig. 9 (b) shows a portion of the sheet metal member 2 after the cutting and removing step S13 and the C chamfering step S14 are performed, and fig. 9 (C) shows a portion of the sheet metal member 2 after the screw hole machining step S15 is performed. Fig. 10 is a perspective view of the metal plate member 2 shown in fig. 9, and fig. 11 is a perspective view of the metal plate member 2 viewed from another angle. In the above-described manufacturing method, the thickness direction of the metal plate-like material 2 is the vertical direction (the axial direction of the screw hole 11).

In the manufacturing method, in the hole forming step S12, a punch is driven in the thickness direction of the metal plate-like material 2. In the cutting and removing step S13, the metal plate member 2 is cut and removed at the portion indicated by the dotted line frame β shown in fig. 9. The upper edge of the dotted line frame β is positioned above the lower surface of the metal material 21 and below the upper surface of the pressing portion 21 a.

As described above, the method of manufacturing the surface mount nut 1 according to the present embodiment is a method of manufacturing the bottomed cylindrical surface mount nut 1 from the metal material 21, the bottomed cylindrical surface mount nut 1 having the screw hole 11 opened upward and being capable of welding the bottom surface portion 15 to the mounting surface. The manufacturing method includes a hole forming step S12 (step of driving a punch Jc into the metal material 21 from above to form a hole 21b in the metal material 21 with a part of the hold-down portion 21a protruding from the lower surface of the metal material 21 and the upper surface of the hold-down portion 21a serving as a bottom), a cutting and removing step S13 (step of cutting and removing the lower portion of the metal material 21 at a position above the lower surface of the metal material 21 and below the upper surface of the hold-down portion 21a), and a screw hole machining step S15 (step of machining the hole 21b into the screw hole 11), and the surface subjected to the cutting is set as the bottom surface portion 15.

Therefore, it is easy to appropriately provide a portion of the bottom while using a portion of the hold-down portion 21a as the bottom of the screw hole 11. Further, as a method of forming a bottomed cylindrical body having a hole of the same depth as that of the surface mount nut 1, in the case of using deep drawing, approximately 4 to 5 steps are required for gradually increasing the depth hole, but according to the manufacturing method of the present embodiment, the bottomed cylindrical body can be formed by two steps of the hole forming step and the cutting removal step, and the manufacturing efficiency is excellent.

Further, in the case where the hole is formed in the hole forming step S12 of the present embodiment, the dimensional accuracy of the hole can be further improved as compared with the case where the hole is formed by deep drawing press working, and the formation of the screw hole by tapping can be performed more stably. As described above, according to the manufacturing method of the present embodiment, even when a relatively deep hole is provided, the number of steps can be reduced and the dimensional accuracy of the hole can be improved easily. In addition, in the case of forming the hole in the hole forming step S12, the sheet metal member to be processed can be easily reduced in size as compared with the case of forming the hole by deep drawing press working.

Further, if a hole is formed by cutting, burrs due to cutting are generated on the inner wall of the hole. When the surface mount nut 1 in a state where the burr remains is disposed on a mounting substrate, the burr drops and adheres to a substrate mounting product, which may cause a trouble such as a short circuit. However, it is not easy to remove such burrs reliably, and it is difficult to remove such burrs particularly when the size of the hole is small. In this respect, according to the hole forming step S12 of the present embodiment, since the hole can be formed without generating the burr due to the cutting, the problem due to the burr can be avoided.

Here, fig. 12 (a) illustrates the metal plate material X in the case of manufacturing the surface mount nut Xa by deep drawing to form a hole, and fig. 12 (b) illustrates the metal plate material 2 in the present embodiment (in the case of manufacturing the surface mount nut 1 by forming a hole in the hole forming step S12). Fig. 13 (a) is a perspective view of the metal plate member X, and fig. 13 (b) is a perspective view of the metal plate member 2. In the example of fig. 12, the pitch P1 for the sheet metal material X (the interval between laterally adjacent surface mount nuts) and the pitch P2 for the sheet metal material 2 are both 9 mm. However, the longitudinal dimension L1 of the metal plate member X was 16mm, while the longitudinal dimension L2 of the metal plate member 2 was 7.5 mm. As described above, the sheet metal member 2 of the present embodiment is smaller than the sheet metal member X used for manufacturing the surface mount nut of the same degree by deep drawing and pressing.

The hole forming step S12 is performed in a state where the base Ja is provided on the lower surface of the metal material 21, and a hole Jah having a radial dimension substantially equal to that of the punch Jc is provided at a position overlapping the punch Jc in a plan view of the base Ja. Therefore, the shape and size of the pressed portion 21a pressed downward by the driving of the punch Jc can be restricted by the hole Jah, and the hole forming step S12 can be stably performed.

The through hole Jah of the base Ja used in the hole forming step S12 can be variously modified. This point will be described in more detail below.

Fig. 14 illustrates an example of the form of the surface mount nut 1 manufactured by the steps S11 to S16 in which the shape and the size of the through hole Jah in plan view are set to be equal to those of the punch Jc in plan view. In fig. 14 (fig. 15 and 16 described later), (a) shows an external perspective view viewed from obliquely above, (b) shows an external perspective view viewed from obliquely below, (c) shows a plan view, (d) shows a front view, (e) shows a bottom view, (f) shows a side view, and (g) shows an X-X cross-sectional view (a view of an X-X cross-section shown in a side view).

On the other hand, fig. 15 illustrates an example of the form of the surface mount nut 1 manufactured by the steps S11 to S16 in which the radial dimension of the through hole Jah in plan view is set smaller than the radial dimension of the punch Jc in plan view. On the lower side of fig. 15, (g) an enlarged view within a dotted frame in the X-X sectional view is shown. The through hole Jah is circular and the same shape as the punch Jc in plan view, and the center positions of the through hole Jah and the punch Jc overlap each other in plan view. The outer edge of the through hole Jah is located inward of the outer edge of the punch Jc in plan view. The area of the through hole Jah in plan view is smaller than the area of the punch Jc in plan view.

Here, as the cutting and removing step S13, a step of cutting and removing only a portion of the holding portion 21a protruding downward from the lower surface of the metal material 21 is employed. That is, in the surface mount nut 1 shown in fig. 15, the punch Jc is driven to the position shown by Y1 in the hole forming step S12, and only the push-down portion 21a is cut and removed at the position shown by Y2 in the cutting and removing step S13.

In the surface mount nut 1 shown in fig. 15, the upper portion of the push-down portion 21a remaining without being cut off is also used as the locking portion 13, and the lower side of the screw hole 11 is locked by the locking portion 13. Further, since the diameter of the through hole Jah is made smaller than the diameter of the punch Jc as described above, in the hole forming step S12, the pressing portion 21a is gradually narrowed from a slightly upper side of the opening of the through hole Jah to the opening. Therefore, as shown in fig. 15, a taper TP in cross-sectional view is formed on the outer peripheral portion of the latch portion 13, and the diameter of the upper side is enlarged, so that the latch portion 13 can be prevented from falling downward.

By thus disposing the outer edge of the through hole Jah on the inner side of the outer edge of the punch Jc in plan view, the latch 13 does not come off even if the thickness Ya of the latch 13 is sufficiently reduced, and the bottom of the screw hole 11 can be easily and appropriately set while being sufficiently reduced. In addition, even if only the portion of the holding-down portion 21a protruding from the lower surface of the metal material 21 is cut and removed in the cutting and removing step S13, the latch portion 13 can be appropriately provided without being disengaged. The outer edge shape of the through hole Jah in a plan view may be other than a circle.

Fig. 16 shows an example of the surface mount nut 1 manufactured in the steps S11 to S16, in which the outer edge of the through hole Jah is formed in a square shape (an example of a polygon) in a plan view. The punch Jc has a circular shape in plan view, and the center position of the through hole Jah and the punch Jc overlap in plan view. The length of the diagonal line of the square is shorter than the diameter of the circle, and the outer edge of the through hole Jah is arranged inside the outer edge of the punch Jc in plan view. Here, as the cutting and removing step S13, a step of cutting and removing only a portion of the holding portion 21a protruding downward from the lower surface of the metal material 21 is employed.

In the surface mount nut 1 shown in fig. 16, as in the example shown in fig. 15, the tapered portion TP in cross-sectional view is formed on the outer peripheral portion of the locking portion 13, and the diameter of the upper side is enlarged, so that the locking portion 13 can be prevented from falling off downward. Further, since the through hole Jah is square in plan view, the push-down portion 21a protruding from the lower surface of the metal material 21 is also square in plan view. Therefore, when the protruding hold-down portion 21a is cut off, the cutting blade is vertically aligned with a plane corresponding to one side of the square in a plan view, and thus the cutting can be performed more smoothly. In addition, even when the push-down portion 21a protruding from the lower surface of the metal material 21 is formed in another polygon such as a rectangle or a triangle, the same effect can be obtained by vertically aligning the cutting blade with a plane corresponding to one side of the polygon.

In addition, when the cutting and removing step S13 is performed by cutting and removing only the portion of the depressed portion 21a protruding downward from the lower surface of the metal material 21, the portion to be cut may protrude from the lower surface (corresponding to the bottom surface portion 15) of the metal material 21 and remain due to problems such as machining accuracy. Fig. 17 illustrates a surface mount nut having a region Z projecting from the bottom surface portion 15. In fig. 17 (and also in fig. 18 described later), an external perspective view is shown on the left side as viewed obliquely from below, and a cross-sectional view is shown on the right side (from the same viewpoint as fig. 15 (g)).

If such a protruding portion remains, the surface mount nut may be inclined when it is disposed on the mounting surface, and may adversely affect the welding of the surface mount nut to the mounting surface. Therefore, after the cutting and removing step S13, a step (pressing step) of slightly pressing upward a predetermined region of the lower surface of the metal material 21 including the portion to be cut in the top view may be performed. Fig. 18 shows an example of a surface mount nut (surface mount nut having a slightly compressed region 15 a) to which a compression process has been applied. By such a pressing step, a portion protruding downward from the bottom surface portion 15 is eliminated, and the surface mount nut can be satisfactorily welded to the mounting surface.

The surface mount nut 1 manufactured by the manufacturing method of the present embodiment can be used in various forms such as a form in which substrates are coupled to each other. For example, when the surface mount nut 1 is used as a component of a smartphone, the surface mount nut can be used for an application of connecting a cover for preventing a Board-to-Board (BtoB) connector from floating to a mounting substrate, and can also be used for an application of connecting a Laser Direct Structuring (LDS) antenna to a mounting substrate.

Further, the surface mount nut 1 manufactured by the manufacturing method of the present embodiment is a bottomed cylindrical surface mount nut having a screw hole 11 opened upward and capable of welding a bottom surface portion 15 to a mounting surface, and is configured such that the locking portion 13 below the locking screw hole 11 can be removed.

That is, as described above, the lock portion 13 is formed by driving the punch Jc to move a part of the metal material 21 downward. Therefore, although the outer peripheral portion of the locking portion 13 is in close contact with the portion of the surface-mount nut 1 around the outer peripheral portion, the metal structure is discontinuous (including a divided state) at the boundary between the outer peripheral portion of the locking portion 13 and the periphery thereof, and the bonding between the outer peripheral portion of the locking portion 13 and the periphery thereof is weakened.

Thus, the locking portion 13 of the surface mount nut 1 does not come off accidentally, but the locking portion 13 can be removed relatively easily by applying a force to the locking portion 13 to a certain degree or more upward or downward. As shown in fig. 15, when the tapered portion TP is formed on the outer peripheral portion of the latch portion 13, the latch portion 13 can be removed by applying an upward force to the latch portion 13.

Further, since the metal structure is discontinuous (including a divided state) at the boundary between the outer peripheral portion of the latch portion 13 and the periphery thereof, even if the bottom surface portion 15 is formed in a planar shape, the boundary between the latch portion 13 and the portion other than the latch portion 13 in the bottom surface portion 15 appears as a pattern, and thus can be recognized. For example, in the examples shown in fig. 14, 15, and 18, the boundary in the bottom surface portion 15 appears in a pattern of a circle and can be recognized, and in the example shown in fig. 16, the boundary in the bottom surface portion 15 appears in a pattern of a quadrangle and can be recognized. Therefore, the region of the latch 13 in the bottom surface 15 can be easily recognized, and it is also easy to accurately recognize in advance which kind of hole is opened in the bottom surface 15 when the latch 13 is removed. Even when the surface mount nut 1 is used without removing the locking portion 13, if the boundary between the locking portion 13 and the portion other than the locking portion 13 in the bottom surface portion 15 is visible, the position of the screw hole 11 can be easily recognized when the surface mount nut 1 is viewed from below, which is convenient.

As described above, the surface mount nut 1 is provided with the removable locking portion 13, and therefore can be used in a form having the locking portion 13 (a form in which the screw hole 11 is not penetrated), but can also be used in a form in which the locking portion 13 is removed as necessary and penetrates below the screw hole 11. For example, when the bottom surface portion 15 of the surface mount nut 1 is fixed to a mounting board and a screw inserted into the screw hole 11 from above reaches the mounting board, the locking portion 13 of the surface mount nut 1 may be removed in advance.

The configuration of the present invention can be variously modified in addition to the above embodiments without departing from the scope of the present invention. That is, the described embodiments are to be considered in all respects as illustrative and not restrictive. The technical scope of the present invention is defined by the claims, rather than the description of the embodiments, and should be understood to include the meaning equivalent to the claims and all modifications within the scope. The method of manufacturing a surface mount nut according to the present invention may be regarded as an aspect of the method of manufacturing a bottomed cylindrical body according to the present invention, and main technical features are common.

Claims

1. A method of manufacturing a bottomed tubular surface mount nut having a threaded hole opened upward and having a bottom surface portion weldable to a mounting surface, from a metal material, comprising:

a hole forming step of driving a punch from above into the metal material provided with a base having a hole portion at a lower side thereof, and forming a hole having an upper surface of the pressed portion as a bottom in the metal material by causing a part of the pressed portion to protrude from a lower surface of the metal material into the hole portion; and

and a screw hole machining step of machining the formed hole into the screw hole.

2. The method of manufacturing a surface mount nut according to claim 1, wherein an outer edge of the hole is disposed further inward than an outer edge of the punch in a plan view.

3. The method of manufacturing a surface mount nut according to claim 2, wherein the outer edge of the hole is formed in a polygonal shape in plan view.

4. The method of manufacturing a surface mount nut according to claim 1 or 2, comprising:

a cutting and removing step of cutting and removing the protruding portion of the metal material; and

and a pressing step of pressing upward a predetermined region of the lower surface of the metal material including the portion to be cut when viewed from above.

5. The method of manufacturing a surface mount nut according to claim 1 or 2, comprising a cutting and removing step of cutting and removing a lower portion of the metal material at a position above the lower surface and below the upper surface,

and the surface to be cut is the bottom surface portion.

6. The method of manufacturing a surface mount nut according to claim 1 or 2, comprising a step of performing a C-chamfer on an upper end portion of the side wall of the hole.

7. A manufacturing apparatus of a surface mount nut, characterized in that the surface mount nut is manufactured by the manufacturing method according to claim 1 or 2.

8. A method for manufacturing a bottomed cylindrical body having a hole opened upward from a metal material, comprising:

a hole forming step of driving a punch from above into the metal material having a base having a hole formed in a lower side thereof, and forming a hole in the metal material with an upper surface of the pressed portion as a bottom, such that a part of the pressed portion protrudes from a lower surface of the metal material into the hole; and

and a cutting and removing step of cutting and removing a lower portion of the metal material at a position above the lower surface and below the upper surface.

9. A method for manufacturing a bottomed cylindrical body having a hole opened upward from a metal material, comprising:

a hole forming step of driving a punch from above into the metal material having a base having a hole formed in a lower side thereof, and forming a hole in the metal material with an upper surface of the pressed portion as a bottom, so that a part of the pressed portion protrudes from a lower surface of the metal material into the hole,

and an outer edge of the hole is disposed inside the outer edge of the punch in a plan view.

10. A surface mount nut having a bottomed cylindrical shape having a screw hole opened at an upper side and capable of welding a bottom surface portion to a mounting surface,

a latch portion that latches a lower portion of the screw hole can be removed.

11. The surface mount nut as defined in claim 10, wherein a boundary between said locking portion and a portion other than said locking portion in said bottom surface portion is visible.

12. A surface mount nut produced by the production method according to claim 1 or 2.