JP2007016930A - Attachment cylindrical body, and manufacturing method of the cylindrical body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To firmly fix a cylindrical nut to an attachment plate by machining the cylindrical nut having high strength with high machining accuracy. <P>SOLUTION: A ring like groove 5 for fitting a rim of an attachment hole to be attached is formed on a one end side circumferential wall of a cylinder 2, a cylindrical hole 3b in a ring like groove periphery including the ring like groove is formed with a larger diameter than another cylindrical hole 2b, and a cylinder wall is partially thinned. In the manufacturing method, a bottomed cylinder part is formed by carrying out a number of times of drawing of a plate material, the cylinder part is considered as an inner cylinder, its outer circumferential side is folded back toward a tip side of the inner cylinder to form an outer cylinder higher than the inner cylinder, the outer cylinder and the inner cylinder are closely adhered to each other and integrated, and the ring like groove is formed in a position on an outer circumferential face of the outer cylinder, not overlapping the inner cylinder. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a mounting cylindrical body such as a cylindrical nut that is press-fitted onto a mounting plate such as a chassis or a substrate of an engine cover, and a manufacturing method thereof.

  2. Description of the Related Art Conventionally, in a chassis or a substrate of an electric device such as a liquid crystal television or a PDP television, a mounting hole is formed, and a nut is press-fitted into the mounting hole so that other parts can be screwed. As the nut, a so-called T-nut having a caulking flange is known (see Patent Documents 1 and 2). In this T-nut, a cylindrical nut is press-fitted into a mounting hole of a mounting plate, and a caulking flange is caulked to attach the mounting nut to the mounting plate. In addition to this, as shown in FIG. 5, a ring groove 16 is formed on the outer peripheral wall of the cylindrical nut 15, the nut 15 is inserted into the mounting hole 21 of the plate member 20, and the flange 17 of the nut 15 is inserted. It is known that the peripheral edge of the mounting hole 21 is fitted and fixed in the ring groove 16 by pressing the mounting plate 20 and the mounting plate 20.

The nuts are currently manufactured mainly by cutting products, and some forged products are starting to appear. Moreover, it can carry out by press work as shown in Patent Documents 1 and 2. In the press working, the plate member is drawn to form a bottomed cylindrical portion, the bottom of the cylindrical portion is punched to form a cylindrical body, and a female screw is formed in the cylindrical hole to form a cylindrical nut.
Japanese Patent Laid-Open No. 9-300043 Japanese Patent Laid-Open No. 10-54415

  However, when the above-described nut is processed by cutting, it is difficult to keep the processing accuracy constant due to wear of the cutting blade and the like, and there is a problem that a chip removal operation is required. In addition, nuts obtained by conventional press processing have the advantage of high processing accuracy because they do not use a cutting blade, but it is difficult to adjust the height accurately, and when used as a product, Since a plurality of nuts are attached to the attachment plate, there is a problem in that the components and the like are not properly attached when the height varies due to the nuts. Further, when a cylindrical body such as a nut attached to the mounting plate is used as the spacer, the gap accuracy as the spacer cannot be sufficiently obtained if the height accuracy of the cylindrical body is low.

  In addition, the conventional nut described above has a problem that a strength formed by a thin cylindrical wall cannot be sufficiently obtained. On the other hand, as shown in FIG. 5, it can be constituted by a thick cylindrical wall and the mounting plate can be fitted into the ring-shaped groove, but there is a problem that a sufficient fixing force cannot be obtained by caulking.

  The present invention has been made against the background of the above circumstances, and provides an attachment cylindrical body that can increase the strength of the cylindrical body itself, can be attached to a plate material, and can be fixed with sufficient fixing force. An object of the present invention is to provide a method of manufacturing a mounting cylindrical body that can process the cylindrical body with high processing accuracy.

  That is, the invention according to claim 1 of the mounting cylindrical body of the present invention is a cylindrical body that is press-fitted into a mounting hole of a plate material, and is attached to an outer peripheral wall at one end of the cylindrical body. A ring-shaped groove with which the periphery is fitted is formed, a cylindrical hole around the ring-shaped groove including the ring-shaped groove is formed with a relatively large diameter, and the cylindrical body wall is partially formed thin. It is characterized by that.

  The invention of the mounting cylindrical body described in claim 2 is characterized in that, in the invention of claim 1, a flange piece extending toward the outer peripheral side is provided at the one end of the cylindrical body.

  According to a third aspect of the present invention, in the invention according to the first or second aspect, the thin portion is formed at a height of 1/5 to 1/2 of the total cylindrical body height. It is characterized by that.

  The invention of the mounting cylindrical body according to claim 4 is the invention according to any one of claims 1 to 3, wherein the thick portion excluding the thin portion of the cylindrical body has a plurality of cylindrical portions stacked coaxially. It is characterized by being thick.

  According to a fifth aspect of the present invention, in the invention according to the fourth aspect, the thick portion includes a partition portion that blocks the cylindrical hole.

  The invention of the mounting cylindrical body according to claim 6 is the invention according to any one of claims 1 to 5, wherein a plurality of ribs along the radial direction are formed at intervals in the ring-shaped groove. It is characterized by that.

  The invention of the mounting cylindrical body according to claim 7 is the invention according to any one of claims 1 to 6, wherein a female screw portion is formed in the cylindrical hole of the cylindrical body to form a cylindrical nut. Features.

  The invention of the manufacturing method of the mounting cylindrical body according to claim 8 forms a bottomed cylindrical portion in a plate material by several-order drawing processing, and uses the cylindrical portion as an inner cylinder, and the outer peripheral side thereof is the front end side of the inner cylinder. The outer cylinder is folded back toward the inner cylinder to form a taller outer cylinder than the inner cylinder, the outer cylinder and the inner cylinder are brought into close contact with each other, and are located on the outer peripheral surface of the outer cylinder so that the inner cylinders do not overlap with each other It is characterized in that a ring-shaped groove is formed.

  The invention of the manufacturing method of the mounting cylindrical body according to claim 9 is characterized in that, in the invention of claim 8, the bottom of the inner cylinder is removed.

  The invention of the manufacturing method of the mounting cylindrical body according to claim 10 is the invention according to claim 8 or 9, wherein the end of the outer cylinder extended to a position where the inner cylinder does not overlap is folded back to the outer peripheral side. And a flange piece is formed by punching the outer peripheral side.

  According to an eleventh aspect of the present invention, there is provided a manufacturing method of a mounting cylindrical body, wherein in the invention according to any one of the eighth to tenth aspects, an internal thread portion is formed on an inner peripheral surface of the inner cylinder.

  That is, according to the mounting cylindrical body of the present invention, the inner peripheral diameter of the cylindrical hole is different between the periphery of the ring-shaped groove and the other portion, and the periphery of the ring-shaped groove is a large-diameter cylindrical hole. The cylindrical wall around the groove is relatively thin. When the mounting cylindrical body is inserted into the mounting hole of the plate member and caulked, the peripheral edge of the mounting hole is deformed so as to be pressed toward the inner peripheral side. The thin portion is elastically deformed to the inner peripheral side by the deformation force at the periphery of the mounting hole. When the caulking is finished, the deformation force at the periphery of the attachment hole is lost, and the thin portion of the attachment cylindrical body returns to the outer peripheral side by elastic deformation, and the ring-shaped groove and the inner peripheral surface of the attachment hole are firmly fitted. Moreover, the attachment cylindrical body is formed thick except for the thin-walled portion, and high strength can be obtained as the entire cylindrical body.

  Moreover, according to the manufacturing method of the mounting cylindrical body of this invention, the cylindrical body from which thickness differs can be manufactured, without requiring a cutting process by superimposing an inner cylinder and an outer cylinder, In the height correction of the cylindrical body, the folding position of the inner cylinder and the outer cylinder is finely adjusted by applying a pressing force to the cylindrical body along the axial direction, and high height accuracy can be obtained. Note that ribs can be provided along the radial direction in the ring-shaped groove in order to further strengthen the fitting between the peripheral edge of the mounting hole and the ring-shaped groove. By providing the ribs at equiangular intervals, the fixing with the peripheral edge of the mounting hole can be made uniform and stronger. The number is preferably 2 to 4. If this number is small, the effect of strengthening the fitting cannot be obtained sufficiently. On the other hand, if the number is too large, the fitting becomes insufficient.

The mounting cylindrical body of the present invention is preferably provided as a cylindrical nut, but can also be used as a self-clinching spacer or the like.
Moreover, the cylindrical body of this invention has a thin part and a thick part by a cylinder hole diameter differing as mentioned above. As described above, it is desirable that the thin portion is provided around the ring-shaped groove, preferably on the tip. The thin portion is preferably in the range of 1/5 to 1/2 with respect to the total height of the cylindrical body. This is because if the thin portion is provided exceeding 1/2, the strength of the entire cylindrical body cannot be obtained sufficiently. Further, when the ratio of the thin-walled portion is less than 1/5, there is little elastic deformation of the mounting cylindrical body and the fixing force of the cylindrical body becomes small when it is inserted into the mounting hole and caulked.

When the mounting cylindrical body of the present invention is used as a nut, an internal thread portion is formed in the cylindrical hole. By forming the female screw portion in the thick portion of the cylindrical wall, high strength can be obtained.
Further, in order to further fix the mounting cylindrical body of the present invention by caulking, it is desirable to provide a flange piece extending outward from the ring-shaped groove at the end of the cylindrical body located at the tip.

  In addition, the manufacturing method of the present invention described above is suitable for the manufacturing method of the mounting cylindrical body, but the manufacturing method of the mounting cylindrical body of the present invention is not limited to a specific one. As in the manufacturing method of the present invention, the thick portion and the thin portion may be integrally formed without overlapping the inner cylinder and the outer cylinder. However, the manufacturing method of the present invention is advantageous in that the mounting cylindrical body is manufactured with low cost and high processing accuracy.

  As described above, according to the mounting cylindrical body of the present invention, it is a cylindrical body that is press-fitted and attached to the mounting hole of the plate material, and the inner peripheral edge of the mounting hole on the outer peripheral wall on one end side of the cylindrical body A ring-shaped groove is formed, the cylindrical hole around the ring-shaped groove including the ring-shaped groove is formed with a relatively large diameter, and the cylindrical body wall is partially formed thin. When fixing the mounting cylindrical body to the plate material, the inner peripheral edge of the mounting hole of the plate material can be closely fitted and fitted into the ring-shaped groove of the mounting cylindrical body, and the mounting cylindrical body can be securely and firmly attached to the plate material. Can be fixed. Therefore, when used as a caulking cylindrical body, the mounting cylindrical body is reliably fixed even when the caulking plate material is thin.

  Further, according to the method for manufacturing a mounting cylindrical body of the present invention, a bottomed cylindrical portion is formed on the plate material by several-stage drawing, and if desired, the bottom of the inner cylinder is removed, and the cylindrical portion is The outer cylinder is folded back toward the tip end side of the inner cylinder to form an outer cylinder that is taller than the inner cylinder, and the outer cylinder and the inner cylinder are brought into close contact with each other, and the outer circumference of the outer cylinder is integrated. Since the ring-shaped groove is formed at a position where the inner cylinder does not overlap, the mounting cylindrical body can be manufactured with high machining accuracy without depending on the cutting process. Moreover, it can process efficiently by a series of press work, and it becomes possible to reduce manufacturing cost.

Below, one Embodiment of this invention is described based on FIGS. 1-3.
The mounting cylindrical body 1 has a nut cylinder portion 2 as a main component, and the nut cylinder portion 2 includes a thick cylinder portion 2a and a thin cylinder portion 2b, which are made thick by a double cylinder portion, and are connected in the axial direction. Each cylindrical portion has the same outer diameter, and the large diameter cylindrical hole 3b of the thin cylindrical portion 2b is larger than the small diameter cylindrical hole 3a of the thick cylindrical portion 2a. A female screw portion 4 is formed on the inner peripheral surface of the large-diameter cylindrical hole 3a of the thick-walled cylindrical portion 2a.

On the other hand, a ring-shaped groove 5 is formed on the outer peripheral surface at a front end side of the thin-walled cylindrical portion 2b at a depth that is approximately half the wall thickness, and four ribs are equiangularly spaced in the ring-shaped groove 5. 5a is formed along the radial direction. In this embodiment, the rib 5a is formed at the entire depth of the ring-shaped groove 5, but the depth can be appropriately determined within the depth of the ring-shaped groove 5, and if desired, the ring-shaped groove It may protrude beyond 5 to the outer peripheral side. In addition, the width of the ring-shaped groove 5 needs to be smaller than the plate thickness in consideration of the plate thickness of the plate material to be attached.
Further, a flange piece 6 extending to the outer peripheral side is formed at the tip of the thin-walled cylinder part 2b, and a tooth part 6a is formed on the outer peripheral edge of the flange piece 6 over the entire circumference.
In addition, in the mounting cylindrical body 1 of this embodiment, as shown in FIG.1 (d), the height h of the thin cylindrical part 2b is within the range of the ratio of 30 to 40% with respect to the total cylindrical body height H. It has become. Note that the height h of the thin-walled cylindrical portion 2b is slightly higher than the thickness of the plate member to which the mounting tubular body 1 is attached.

  Next, the manufacturing method of the attachment cylindrical body 1 of this invention is demonstrated based on FIG. In addition, the attachment cylindrical body 1 demonstrated above is not limited to what is manufactured by the manufacturing method demonstrated below, The following manufacturing methods are shown as an example.

First, a plate material 1a made of a general steel material, an aluminum alloy material or the like is prepared, and the plate material 1a is subjected to several-stage drawing using punches 30a to 30f and wrinkle pressers 31a to 31f (steps 1 to 7). The bottomed tube portion 200 is formed on the plate 1a. In the next step, the bottom of the cylindrical portion 200 is punched (step 8). It is also possible to leave this bottom without punching.
Next, in step 9, burring is performed using the punch 32, and further, the outer peripheral side of the cylindrical portion 200 is folded back by drawing to form a cylindrical portion 201 that is taller than the cylindrical portion 200 (step). 11 and 12), the cylinder part 2 which stuck both cylinder parts is obtained (process 12). Next, the tip of the cylindrical body 2 is flattened by the punch 33 (step 13). Further, the ring-shaped groove 5 is formed on the outer peripheral surface on the proximal end side of the cylindrical portion 2 using the cam 34 (step 14). At this time, ribs are formed at equal intervals in the ring-shaped groove 5. Next, height adjustment (dimensioning) of the cylindrical portion 2 is performed using the punch 33 (step 15). After finishing (step 16), punching is performed leaving a flange piece on the outer peripheral side of the cylindrical body 2 (step 17). At this time, the tooth portion 6a is formed by a die. Thereafter, an internal thread portion is formed on the inner surface of the cylindrical portion 2 by punching (not shown).

  In the above process, the mounting cylindrical body can be manufactured by a series of press work without cutting, that is, without generating chips. The process is a single process and excellent in productivity, and an attachment cylinder can be obtained at low cost. Further, since no cutting blade is used, the shape is stable and the processing accuracy is excellent.

Next, the mounting of the mounting cylindrical body 1 will be described with reference to FIG.
The plate member 20 is formed with a mounting hole 21 that fits into the ring-shaped groove 5 of the mounting tubular body 1, and the thickness h of the thin tube portion is slightly larger than the thickness of the mounting plate 20. Yes.
When attaching the mounting cylindrical body 1, the mounting cylindrical body 1 is inserted into the mounting hole 21 from the end side of the thick cylindrical portion 2a (FIG. 3A).

  Then, the flange piece 6 is brought into contact with one side of the plate member 20, and is sandwiched between the back side of the flange piece 6 and the other side of the plate member 20 by ring-shaped dies 25 and 26, and a pressing force for caulking is applied from both sides. . Then, the plate material 20 around the mounting hole 21 is crushed toward the inner peripheral side, and a deformation force of the plate material 20 is applied from the outer peripheral side to the inner peripheral side of the mounting cylindrical body 1. As a result, as shown in FIG. 3B, the thin cylindrical portion 2 b is elastically deformed toward the inner peripheral side, and a part of the plate material 20 is press-fitted into the ring-shaped groove 5.

  Thereafter, when the caulking is stopped and the molds 25 and 26 are removed, the deformation force of the plate member 20 is reduced, and the thin cylindrical portion 2a of the mounting cylindrical body 1 returns to its original shape by elastic deformation. At this time, the ring-shaped groove 5 is strongly adhered to the plate material 20 press-fitted into the ring-shaped groove 5 by an elastic force, and as a result, the plate material 20 and the mounting cylindrical body 1 are firmly fixed (FIG. 3 (c)). In addition, the rib 5a provided in the ring-shaped groove 5 is strongly pressed by the periphery of the attachment hole 21, and the attachment cylindrical body 1 is fixed more firmly. The mounting cylindrical body 1 is used as a cylindrical nut, and other members can be mounted by screwing a screw into a female screw portion 4 formed in the thick cylindrical portion 2a. At this time, the mounting cylindrical body 1 has high strength by having the thick cylindrical portion 2a.

In the above embodiment, the mounting cylindrical body has been described as having a cylindrical hole penetrating, but the present invention may be such that the cylindrical hole is partially closed. The embodiment will be described below with reference to FIG. In addition, about the structure similar to the said embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.
The mounting cylindrical body 10 of this embodiment has a thick cylindrical portion 2a and a thin cylindrical portion 2b, as in the above-described embodiment, and the cylindrical hole 3b of the thin cylindrical portion 2b has a thick cylindrical portion 2a. The diameter is larger than that of the cylindrical hole 3a. And the cylindrical hole 3a has the partition part 11 formed in the edge part which reaches the cylindrical hole 3b, and the cylindrical hole 3a is obstruct | occluded. The partition portion 11 prevents entry of foreign matter from the cylindrical hole 3b side to the cylindrical hole 3a side, and conversely, entry of foreign matter from the cylindrical hole 3a side to the cylindrical hole 3b side.

  Although the present invention has been described based on the above embodiment, the present invention is not limited to the description of the above embodiment, and can be appropriately changed within the scope of the present invention.

It is a figure which shows the attachment cylindrical body of one Embodiment of this invention, (a) A figure is a top view, (b) A figure is the bb sectional view taken on the line of a figure, (c) A figure is c of figure b. -C sectional drawing, (d) is a figure explaining the relationship of the height of a cylinder part. It is process drawing which shows one Embodiment of the manufacturing method of the attachment cylindrical body of this invention. It is a figure which shows the attachment process of the attachment cylindrical body of one Embodiment of this invention. It is sectional drawing which shows the attachment cylindrical body in other embodiment of this invention. It is a figure which shows the attachment process of the conventional attachment cylinder.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Attachment cylindrical body 2 Nut cylinder part 2a Thick cylinder part 2b Thin cylinder part 3a Small diameter cylindrical hole 3b Large diameter cylindrical hole 4 Female thread part 5 Ring-shaped groove 5a Rib 6 Flange piece 6a Tooth part 10 Attachment cylindrical body 11 Partition part 20 Plate material 21 Mounting hole

Claims (11)

  A cylindrical body that is press-fitted into a mounting hole of a plate material and is attached to an outer peripheral wall on one end side of the cylindrical body, and includes a ring-shaped groove that fits the inner peripheral edge of the mounting hole. A mounting cylindrical body characterized in that a cylindrical hole around the ring-shaped groove is formed to have a relatively large diameter, and a cylindrical body wall is partially formed to be thin.   The mounting cylindrical body according to claim 1, wherein a flange piece extending toward an outer peripheral side is provided at the one end of the cylindrical body.   The mounting cylindrical body according to claim 1 or 2, wherein the thin portion is formed at a height of 1/5 to 1/2 of a total cylindrical body height.   The mounting cylindrical body according to any one of claims 1 to 3, wherein the thick portion excluding the thin portion of the cylindrical body is formed by thickening a plurality of cylindrical portions coaxially.   The mounting cylindrical body according to claim 4, wherein the thick portion includes a partition portion that blocks the cylindrical hole.   The mounting cylindrical body according to any one of claims 1 to 5, wherein a plurality of ribs along the radial direction are formed in the ring-shaped groove at intervals.   The mounting cylindrical body according to claim 1, wherein a female screw portion is formed in a cylindrical hole of the cylindrical body to form a cylindrical nut.   Forming a cylindrical part with a bottom by several-stage drawing on the plate material, with the cylindrical part as an inner cylinder, the outer peripheral side thereof is folded back toward the distal end side of the inner cylinder, and an outer cylinder that is taller than the height of the inner cylinder is formed. The outer cylinder and the inner cylinder are formed in close contact with each other, and a ring-shaped groove is formed on the outer peripheral surface of the outer cylinder at a position where the inner cylinder does not overlap. Body manufacturing method.   The method for manufacturing a mounting cylindrical body according to claim 8, wherein the bottom of the inner cylinder is removed.   The end of the outer cylinder extended to a position where the inner cylinder does not overlap is folded back to the outer peripheral side, and a flange piece is formed by punching out the outer peripheral side. A manufacturing method of a mounting cylindrical body.   The method for manufacturing a mounting cylindrical body according to any one of claims 8 to 10, wherein a female screw portion is formed on an inner peripheral surface of the inner cylinder.

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