JP2007016986A - Caulking fixed type support pin, and back plate for flat display panel mounted with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the formation of burrs in a caulking process while improving mounting strength in a support pin (a stud pin) caulking-fixed to a plate-like workpiece. <P>SOLUTION: The support pin 1 comprises a fit-in part 2 fitted into a hole S1 of the workpiece S; a flange part 3 provided at one end of the fit-in part 2; and a projecting shank 5 provided at the other end of the fit-in part 2. An annular recess 6 is formed at the end face part of the fit-in part 2 to form a caulking part 4 of triangular cross section. The axial length L1 of the fit-in part 2 is longer than the plate thickness dimension T1 of the workpiece S. In the caulking process using a die 7 and a punch 8, the tip of the caulking part 4 is exposed from the workpiece S from the beginning. Directionality of deforming a part of the caulking part 4 to expand outward is thereby imparted to prevent burring of the part of the caulking part 4. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a caulking fixing type support pin (stud pin) mainly used for holding plate members in a substantially parallel posture , and a back plate for a flat display panel to which the pin is attached .

  In recent years, plasma display panels and liquid crystal display panels are becoming mainstream in place of the cathode ray tube system as a display for displaying images, and the practical use of other types of flat display panels such as the organic EL system is approaching. One of the features of these flat display panels is that they can be easily increased in size, and TV receivers have been remarkably increased in size due to the appearance of flat display panels.

This display panel requires a member that supports the display section regardless of the type, and in the case of a small display panel, for example, a resin housing is used as a support member as disclosed in Patent Document 1, If the display panel becomes larger than a certain size, it becomes difficult to ensure strength and rigidity with only a resin housing. Therefore, as shown in FIG. 7 (A), place the backplate preparative S made of a metal plate such as steel plate or aluminum plate inside or rear portion surrounded by the cover, the display panel P by the backplate S Ensuring the strength and rigidity of the

  Then, as shown in FIG. 7B, a large number of metal support pins 20 project from the back plate S, and the circuit board P is caulked to the back plate S by using the support pins 20. Installation is done.

And as described in Patent Documents 2 and 3, as a form of the support pin 20 that can be attached to the back plate S, a flange portion is formed at one end portion of the shaft, and a root of the shaft adjacent to the flange portion is formed. There is an annular groove formed at the location, the flange part is formed into a non-circular shape like a petal shape, and the flange part is recessed into the thick part of the workpiece, and the inner peripheral part of the workpiece is annular of the pin There are things that let you get into the groove. Further, Patent Documents 4 and 5 exist as other conventional techniques.
JP 11-338371 A JP 2004-316784 A JP 2003-322128 A JP-A-7-269537 JP 2004-197762 A

  The support pin is generally manufactured from a wire. However, in manufacturing the support pins of Patent Documents 2, 3, and 4, the formation of the flange is processed using a header, while the annular groove is rolled or This has to be formed by cutting. For this reason, there is a problem that the number of processing steps increases and the cost increases.

  Further, in attaching the support pin to the back plate S, the flange portion is strongly pressed with a punch while the protruding portion of the support pin is fitted in a cylindrical die (jig). However, since there is a slight gap between the inner periphery of the die and the protruding portion of the support pin, the edge of the back plate or the support pin becomes burrs and enters the gap in the mounting process, and the support pin extends from the die. Sometimes became difficult to remove.

  This invention makes it a subject to improve such a present condition.

The support pin of the present invention includes a fitting portion 2 that fits into a hole S1 formed in a workpiece S made of a metal plate, and a flange that is formed on the outer periphery of one end portion of the fitting portion 2 and overlaps one surface of the workpiece S. And a projecting shaft 5 provided integrally with a portion of the fitting portion 2 opposite to the flange portion 3.

The protruding shaft 5 has a smaller diameter than the insertion portion 2, and thus an annular end surface is exposed at a portion of the insertion portion 2 opposite to the flange portion 3, and the annular end surface of the insertion portion 2 is exposed to the annular end surface. The annular recess 6 is formed in a state in which the inner peripheral surface thereof coincides with the outer peripheral surface of the projecting shaft 5, and a portion outside the annular recess 6 is crushed and deformed when pressed in the axial direction. Is a caulking portion 4 spreading outward, and further, when the insertion portion 2 and the workpiece S are clamped in the axial direction by a die and a punch in a state where the insertion portion 2 is inserted into the hole S1 of the workpiece S, The whole or most of the fitting portion 2 including the flange portion 3 and the caulking portion 4 is inserted into the thickness of the workpiece S.

Further, the annular recess 6 has a flat bottom surface 6a continuous to the protruding shaft 5, and the depth becomes shallower from the bottom surface 6a to the outer periphery. Therefore, the annular recess 6 has a substantially trapezoidal shape. The total length of the fitting portion 2 is L0, the thickness dimension of the workpiece S is T1, and the axial length dimension from the top surface of the flange portion 3 to the bottom surface 6a of the annular recess 6 is L2. When the axial length dimension from the seating surface of the flange portion 3 to the tip of the caulking portion 4 is L1, L0> T1> L2 and L1> T1 are satisfied.

The present invention also includes a flat display panel back plate to which the support pins according to claim 1 are attached by caulking . In this back plate, the flange portion 3 and the caulking portion 4 of the support pin 1 are included. The whole or most of the fitting portion 2 is recessed within the wall thickness.

  The mounting method of the support pin of the present invention is the same as that of the conventional product, and the flange portion, the fitting portion and the caulking portion are pressed by punching the flange portion with a punch while the workpiece is supported by a cylindrical die into which the protruding shaft is fitted. A force in the axial direction is applied to the top and the crimped portion is deformed, and the flange is pushed into the workpiece.

And in this invention, the edge part of a crimping | crimped part is exposed from the other surface of a workpiece | work in the state which inserted the insertion part in the hole of the workpiece | work and the flange was piled up on one surface of the workpiece | work. For this reason, a pressing force has acted on the caulking portion from the beginning in the attachment process, and as a result, the caulking portion is crushed and deformed so that a part of the caulking portion extends radially outward and fills the annular recess, The occurrence of burring can be prevented.

Further, since the flat valley portion exists in the annular recess, the caulking portion that has been crushed and deformed can be firmly absorbed in the annular recess, and the occurrence of burrs in the caulking portion can be prevented.

  As described above, the support pin of the present invention can prevent burrs from being generated in the process of attaching to the workpiece, so that the support pin can be pulled out from the die after installation without any trouble. Therefore, it is possible to efficiently attach the support pins to the work, and to significantly reduce the defect rate of the work (product) with the support pins.

Further, when the work is a back plate for a display panel, if burrs remain on the back plate , the burrs may come off and adversely affect the product (for example, an adverse effect such as dropping on a circuit board and short-circuiting). However, if the back plate is configured by attaching the support pins of the present invention, no burrs are generated due to the attachment of the support pins, which can contribute to improving the quality of the final product (display panel).

Next, an embodiment of the present invention will be described with reference to the drawings. This embodiment is applied to a support pin attached to the display panel backplate large screen (of course, can also be used for various other work).

(1) Description of Structure The structure of the support pin 1 is shown in FIGS. 1A is a partially broken front view of the support pin 1, FIG. 1B is a bottom view of FIG. 1A, and FIG. 1C is a partially broken view of the main part and the back plate (workpiece) S. FIG. 2 is an enlarged view, and FIG.

The support pin 1 is manufactured using a metal round bar such as aluminum or steel as a raw material. The support pin 1 is formed on the outer periphery of the fitting portion 2 that fits into the hole S1 of the back plate S and one end portion of the fitting portion 2. A plurality of flange portions 3 overlapping one surface of the insertion portion 2, a caulking portion 4 formed integrally with a portion of the insertion portion 2 opposite to the flange portion 3, and a protruding shaft 5 having a smaller diameter than the insertion portion 2. Each flange 3 is formed in a substantially semicircular shape when viewed in the axial direction and is formed in a petal shape as a whole group, but may be in a shape such as a triangle or a trapezoid.

Since the protruding shaft 5 has a smaller diameter than the fitting portion 2, an annular end surface is exposed on the opposite side of the fitting portion 2 from the flange 3. The caulking portion 4 is formed by forming an annular recess 6 in the end surface of the fitting portion 4. In this case, the annular recess 6 is set so that the inner peripheral surface thereof coincides with the outer peripheral surface of the projecting shaft 5, the bottom surface 6 a is a flat surface, and the groove width increases as the distance from the flange 3 increases. . In other words, the annular recess 6 has a substantially trapezoidal cross section.

Accordingly, the thickness t in the radial direction of the caulking portion 4 gradually changes so as to be the largest at the base portion close to the flange portion 3 and the thinnest at the distal end side far from the flange portion 3. To put it directly, in this embodiment, the caulking portion 4 is formed in a cross-sectional triangle shape (right-angled triangle shape) (may be a trapezoidal cross-section having a flat portion at the tip ).

As shown in FIG. 2B, the length dimension L1 of the portion of the fitting portion 2 excluding the flange portion 3 is a dimension slightly larger than the plate thickness dimension T1 of the back plate S by a slight dimension E1. A specific value of the dimension E1 may be about 0.1 to 0.5 mm.

As shown in FIG. 1 (C), the dimension L2 from the top surface of the flange portion 3 to the bottom surface of the annular recess 6 that has become somewhat dimension E2 only smaller than the thickness T of the backplate S. The thickness dimension of the flange part 3 is indicated by T2, and the protruding dimension in the axial direction of the caulking part 4 is indicated by L3.

Overall length L0 of the insertion portion 2 is larger than the thickness dimension T1 of the server Kkupureto S. Accordingly, if it is assumed that only the flange 3 is completely indented into the back plate S, the caulking portion 4 partially protrudes from the back plate S (therefore, the caulking portion 4 is crushed and deformed reliably). Secured).

  The support pin 1 can be manufactured by cutting, but from the viewpoint of manufacturing efficiency, it is preferable to manufacture the support pin 1 by forming using a header or a die. Further, as a means for attaching a member such as a circuit board to the support pin 1, the protruding shaft 5 is formed with a female screw hole 5a opened at its end surface (therefore, the substrate is fixed to the end surface of the protruding shaft 5 with a screw). )

  The method of attaching the support pin 1 to the back plate S is the same as in the prior art. As shown in FIG. 2, the back plate S is supported by a cylindrical die 7 into which the protruding shaft 5 is fitted, and the flange portion 5 is fixed in this state. By applying strong pressure with the punch 8, the flange portion 5 is sunk into the thick portion of the back plate S and the caulking portion 4 is crushed and deformed. The die 7 is fixed to the base plate 9. In FIG. 2 and subsequent figures, the flange portion 3 is shown in a simplified manner.

  FIG. 3 shows how each part is deformed in the caulking process. That is, since the tip end portion of the caulking portion 4 partially protrudes (exposes) from the back plate S with the support pin 1 set, at the initial stage of the caulking step (clamping step), as shown in FIG. Thus, the caulking portion 4 is crushed, but since the caulking portion 4 has a substantially triangular cross-section with a narrow lower end in the drawing, the caulking portion 4 is in a state in which the front end portion escapes radially outward. That is, the caulking portion 4 is given a direction of crushing deformation so that a part thereof escapes radially outward.

Further, when further pinched, the flange portion 3 is sunk into the back plate S, while the staking portion 4 closes the annular recess 6 and is crushed and deformed so as to be sunk into the back plate S. Finally, FIG. As shown in FIG. 4, the flange portion 3 and the caulking portion 4 are completely indented (the flange portion 3 and the caulking portion 4 may protrude slightly with a thickness of, for example, about 0.1 mm. To a certain extent ).

As described above, in the present invention, it is ensured that a part of the caulking portion 4 spreads radially outward and deforms, and the caulking portion 4 is absorbed by the annular recess 6 and escapes to the inner diameter portion of the die 7. by the absence, and reliably prevent the occurrence of burrs, Ru Nodea which can be withdrawn to ensure the support pins 1 from the die 7 after the mounting as shown in FIG. 5 (a).

By the way, since there is a small gap 10 between the inner peripheral surface of the die 7 and the protruding shaft 5, if the end surface of the caulking portion 4 is flat, as shown in the comparative example of FIG. In addition, a part of the caulking portion 4 enters the gap 10 and becomes a burr 4a. Therefore, there is a possibility that the die 7 cannot be removed or the burr 4a is peeled off after being manufactured as a display panel D , thereby adversely affecting the product .

  Further, when the ones of Patent Documents 4 and 5 are applied to the back plate S, the caulking portion 4 is inserted into the hole S1 of the back plate S with the support pin 1 'set on the back plate S as shown in the comparative example of FIG. However, in this structure, in the clamping process, the inner diameter portion of the back plate S escapes and deforms toward the annular recess 6, so that the caulking portion 4 does not expand radially outward and does not expand radially. It is only deformed so as to escape in the direction (in the caulking process, the caulking portion and the meat of the back plate S tend to escape to the annular recess 6 in search of the escape location). Therefore, a part of the caulking portion 4 is It is understood that the phenomenon that the burr 4a is caused to enter the gap 10 between the die 7 and the protruding shaft 5 frequently occurs.

More specifically, in Patent Documents 5 and 6, it can be said that the formation of the caulking portion 4 in a cross-sectional triangle promotes burring instead. In embodiments the contrary, and Turkey protrudes a caulking portion 4 from the rear surface of the back plate S, and that as far as possible the caulking portion 4 from the projection axis 5 to form a flat portion 6a on the annular recess 6 As a result of this synergistic effect, it is possible to reliably prevent the occurrence of burrs and to easily remove the support pin 1 after attachment, and the caulking portion 4 is crushed into a flange shape, so that the attachment strength can be remarkably increased. .

Note that the method of attaching the circuit board P to the back plate S using the support pins 1 is not limited to screwing, but a male screw is formed at the tip of the protruding shaft 5 and screwed into the nut. Various methods can be employed such as a method of fixing with a screw and a method of caulking and fixing the tip of the protruding shaft 5. The support pin 1 can also function as a simple spacer.

(2). Others The present invention can be embodied in various ways other than the above embodiment. For example, the protruding shaft can be formed so that the outer diameter changes in two or three stages. The flange portion does not necessarily have to be formed into a petal shape, and the shape may be selected depending on the application, such as a simple circular shape. Further, the flange portion can be formed in various cross-sectional shapes such as a head shape of a countersunk screw.

The cross-sectional shape of the annular recess is not limited to the trapezoidal shape, but it may also be a state in which the bottom surface is curved loosely.

It is a figure which shows the form of a support pin. It is a figure which shows the attachment process of a support pin. It is a figure which shows the effect | action of a crimping process. It is a partially broken front view after attachment. (A) is a figure which shows a sampling process, (B) is a figure which shows a comparative example. It is a figure which shows another comparative example. It is a schematic diagram of a display panel.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Support pin 2 Insertion part 3 Flange part 4 Caulking part 5 Projection shaft 6 Annular recess 6a Flat bottom face 7 Die 8 Punch S Back plate for flat display panel as an example of workpiece

Claims (3)

A fitting portion that fits into a hole formed in the workpiece, a flange portion that is integrally continuous with the fitting portion and that overlaps one surface of the workpiece, and a portion of the fitting portion that is opposite to the flange portion. It is provided with a crimped portion formed and a protruding shaft provided integrally with a portion of the fitting portion on the side opposite to the flange, and the protruding shaft has a smaller diameter than the fitting portion. A support pin adapted to be fixed to the work by the flange being indented into the work and the caulking part being crushed and deformed,
By forming an annular recess in the end surface of the insertion portion in a state where the groove width of the opening surface portion is larger than that of the bottom portion, the radial thickness at the end surface portion of the insertion portion is closer to the tip side than the root. The caulking portion is thinned, and the dimension from the lower surface of the flange to the tip of the caulking portion is set to be larger than the thickness dimension of the workpiece.
Caulking fixed support pins. A fitting portion that fits into a hole formed in the workpiece, a flange portion that is integrally continuous with the fitting portion and that overlaps one surface of the workpiece, and a portion of the fitting portion that is opposite to the flange portion. It is provided with a crimped portion formed and a protruding shaft provided integrally with a portion of the fitting portion on the side opposite to the flange, and the protruding shaft has a smaller diameter than the fitting portion. A support pin adapted to be fixed to the work by the flange being indented into the work and the caulking part being crushed and deformed,
By forming an annular recess in the end surface of the insertion portion in a state where the groove width of the opening surface portion is larger than that of the bottom portion, the radial thickness at the end surface portion of the insertion portion is closer to the tip side than the root. The caulking portion that is thin is formed, and the annular recess is formed in a substantially trapezoidal shape having a flat bottom surface, and the dimension from the top surface of the flange to the bottom surface of the recess Is set to a dimension smaller than the workpiece thickness dimension,
Caulking fixed support pins. The support pin according to claim 1 or 2 is attached.
Back plate for flat display panel.

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