WO2008007593A1 - Screw fixing device and method of manufacturing screw fixing device - Google Patents

Screw fixing device and method of manufacturing screw fixing device Download PDF

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Publication number
WO2008007593A1
WO2008007593A1 PCT/JP2007/063399 JP2007063399W WO2008007593A1 WO 2008007593 A1 WO2008007593 A1 WO 2008007593A1 JP 2007063399 W JP2007063399 W JP 2007063399W WO 2008007593 A1 WO2008007593 A1 WO 2008007593A1
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WO
WIPO (PCT)
Prior art keywords
screw
formed
groove
portion
hole
Prior art date
Application number
PCT/JP2007/063399
Other languages
French (fr)
Japanese (ja)
Inventor
Yoshihiro Miura
Original Assignee
Ochiai Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to JP2006188840 priority Critical
Priority to JP2006-188840 priority
Priority to JP2007-000753U priority
Priority to JP2007000753U priority patent/JP3131207U/en
Priority to JP2007000752U priority patent/JP3131392U/en
Priority to JP2007-000752U priority
Priority to JP2007-113483 priority
Priority to JP2007113483A priority patent/JP5019593B2/en
Application filed by Ochiai Co., Ltd. filed Critical Ochiai Co., Ltd.
Publication of WO2008007593A1 publication Critical patent/WO2008007593A1/en

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16BDEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS, WEDGES, JOINTS OR JOINTING
    • F16B37/00Nuts or like thread-engaging members
    • F16B37/02Nuts or like thread-engaging members made of thin sheet material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/20Deep-drawing
    • B21D22/206Deep-drawing articles from a strip in several steps, the articles being coherent with the strip during the operation
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21KMAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K23/00Making other articles
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16BDEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS, WEDGES, JOINTS OR JOINTING
    • F16B37/00Nuts or like thread-engaging members
    • F16B37/04Devices for fastening nuts to surfaces, e.g. sheets, plates
    • F16B37/06Devices for fastening nuts to surfaces, e.g. sheets, plates by means of welding or riveting
    • F16B37/062Devices for fastening nuts to surfaces, e.g. sheets, plates by means of welding or riveting by means of riveting
    • F16B37/068Devices for fastening nuts to surfaces, e.g. sheets, plates by means of welding or riveting by means of riveting by deforming the material of the support, e.g. the sheet or plate

Abstract

A screw fixing device (1) has a flange part (13) capable of being fixed to a flat plate (body frame (50)) by staking (45) of the flange part to a hole (51) formed in the flat plate (body frame (50)), and also has a circular tube part (10) contiguous to the flange part (13) and having a space (15) in it. One turn of a screw groove (20) is formed by press working in that top face (11) of the circular tube part (10) that closes the tube part on the opposite side of the flange part. Thus, a series of manufacturing steps including the step of forming the screw groove can be performed by press working. The construction enables the series of steps, including the step of forming the screw groove, for manufacturing the screw fixing device to be performed by press working. This in turn prevents a worker from forgetting screw thread cutting to provide a product definitely provided with a screw thread.

Description

 Specification

 Technical field

 TECHNICAL FIELD [0001] The present invention relates to a screw fixing tool for fixing a screw to a main body frame side, for example, when a circuit board is mounted on a main body frame of a liquid crystal television using a screw, and a method for manufacturing the same.

 Background art

 Conventionally, for example, a circuit board has been mounted on a main body frame of a liquid crystal television using a fixing tool and a screw.

 As shown in FIG. 18, the fixing tool 40 has a screw groove 42 spirally cut from the upper surface at the center of the cylindrical portion 41 and a flange portion 43 having a diameter larger than that of the cylindrical portion 41 at the lower end. In addition, a cutting groove 44 is formed around the end of the cylindrical portion 41 on the flange portion side by a cutting process.

 [0003] Then, as shown in FIG. 19, the flange portion 43 of the fixture 40 is caulked 45 to a plurality of holes 51 formed in the main body frame 50, thereby fixing the fixture 40 to the main body frame 50. After fixing and integrating, the circuit board 60 is arranged on the upper surface side of the fixture 40, and the screw 70 is inserted into the hole 61 of the circuit board 60 and the screw groove 42 of the fixture 40. It was fixed to frame 50. Further, during the crimping process 45, the bulging part on the main body frame 50 side enters the cutting groove part 44 formed in the cylindrical part 41 so that the fixing is ensured.

 Disclosure of the invention

 Problems to be solved by the invention

[0004] The fixture 40 described above has a problem in that it takes time and effort to manufacture because each cylindrical portion 41 requires a thread groove 42 to be manually or threaded by a secondary cage. . In addition, since it is necessary to thread the thread grooves 42 one by one for a large amount of fixtures 40, several of the manufactured fixtures are cut into the thread grooves 42 due to mishandling (forgetting threading). There was a case where things were not done. Then, when the fixing tool 40 is caulked 45 to the main body frame 50, if the screw groove 42 is not cut into one of the fixing tools 40, the circuit board 60 can be mounted. In addition, there was a problem that the integrated main body frame 50 was treated as a defective product. Also, the cutting groove portion 44 formed around the cylindrical portion 41 was formed by a cutting process, so the work was complicated. There is also a problem that it becomes a factor of high cost.

[0005] As for the fixture for fixing the screw, there are no structures suitable for fixing the circuit board 60 to the main body frame 50 as shown in the following patent documents. It was.

 Patent Document 1: JP-A-10-285720

 Patent Document 2: JP 09-137816

[0006] The present invention has been proposed in view of the above circumstances, and by performing a series of manufacturing processes including the formation of screw grooves in the screw fixture by a press process, the forgetting of thread cutting can be prevented and reliably performed. For the purpose of providing a structure of a screw fixture that can produce a threaded product and a method of manufacturing the screw fixture! Speak.

 Means for solving the problem

[0007] In order to achieve the above object, the invention of claim 1 is a flange that can be fixed to the flat plate (main body frame 50) by being caulked 45 in a hole 51 formed in the flat plate (main body frame 50). A screw fixing device 1 including a portion 13 and a cylindrical portion 10 which is continuous with the flange portion 13 and has a space portion 15 therein, and includes the following configuration.

 A screw groove 20 for one round is formed on the top surface 11 that closes the non-flange portion of the cylindrical portion 10 by press-cage processing.

 [0008] The invention of claim 2 is characterized in that, in the screw fixture of claim 1, a mountain shape 13a and a valley shape 13b in which irregularities are continuous are formed around the flange portion.

 A third aspect of the invention is characterized in that, in the screw fixture of the first aspect, a groove portion 14 is formed at an end portion on the flange portion side of the cylindrical portion by press-cage processing.

A fourth aspect of the invention is characterized in that, in the screw fixture of the first aspect, a plurality of the groove portions 14 are formed, and the groove portions 14 are arranged at positions facing each other. The invention of claim 5 is characterized in that, in the screw fixture of claim 1, a step is formed by providing a small diameter cylindrical portion having a diameter smaller than that of the cylindrical portion on the side opposite to the flange portion of the cylindrical portion.

 [0009] The invention of claim 6 is a cylindrical shape having a flange portion 13 at one end and a thread groove 20 at the other end by press-carrying the belt-like plate 30 a plurality of times by the upper mold and the lower mold in a flow operation. A method of manufacturing the screw fixture 1, which includes the following steps.

 Body forming process. In this step, the cylindrical body is formed by a plurality of press forces so that one end is open and the other end has a top surface 11.

 Hole formation process. In this step, a hole 34 is formed in the top surface 11 of the cylindrical body by press working.

 Thread groove machining process. In this step, the screw groove 20 for one round provided with the step absorption hole 21 is formed on the top surface 11 in which the hole 34 is formed by a pressing force.

 Cutting process. In this step, the cylindrical body on which the thread groove is formed is cut off so as to have the flange portion 13 around it to obtain a screw fixture.

 According to the seventh aspect of the present invention, the vertical movement of the corresponding upper mold plate with respect to the predetermined lower mold plate is performed after the thread groove adding step in the method of manufacturing the screw fixture according to the sixth aspect. By incorporating a cam mechanism that converts the movement into a horizontal movement and facing it, and pressing from the horizontal direction facing the cylindrical body, a groove is formed on the side surface of the base of the cylindrical body by pressing. It is characterized by performing a groove processing step.

 The invention method of claim 8 is characterized in that, in the groove processing step in the method of manufacturing a screw fixture of claim 7, two pairs of the cam mechanisms are arranged, and four grooves are simultaneously formed in the cylindrical body. .

 According to the ninth aspect of the present invention, in the hole forming step of the method of manufacturing the screw fixture according to the sixth aspect, the hole to be drilled in the top surface of the cylindrical body is formed by connecting a long hole portion to the circular portion. This shape is a basic shape, and is asymmetrical in the vicinity of the connection between the circular portion and the long hole portion.

[0010] According to the screw fixture 1 of the present invention, the thread groove into which the screw 70 is screwed is formed by pressing. Since the screw groove 20 for one round is formed, the entire manufacturing process can be performed by pressing, and the structure of the screw fixture 1 in which the screw groove 20 is reliably formed can be obtained.

 In addition, in the screw fixing device 1, by providing a small-diameter cylindrical portion 19 that can be fitted into the hole 62 of the circuit board 60, the positioning screw fixing device 1 that facilitates alignment between the main body frame 50 and the circuit board 60 is provided. The structure can be as follows.

 According to the screw fixing device manufacturing method of the present invention, the screw groove 20 into which the screw 70 is screwed is formed by one round of the screw groove 20 provided with the step absorption hole 21 by the press calo process, and the flange portion of the cylindrical portion 10 is formed. Since the plurality of groove portions 14 on the side end are formed by press processing, the entire manufacturing process can be performed by press processing, and the structure of the screw fixture 1 in which the screw groove 20 is reliably formed can be obtained. it can.

 In addition, since the plurality of groove portions 14 at the flange portion side end of the cylindrical portion 10 are formed by press working, the structure of the screw fixture 1 that can secure a sufficient clamping strength due to the presence of the groove portions 14 can be obtained.

 In addition, when manufacturing a screw fixture, the holes that are drilled in the top surface of the cylindrical body by pressing (a shape in which a long hole is connected to a circular part) are made asymmetrical, so that The screw groove 20 formed in the groove-caching process can be made into a screw groove having a larger number of parts in contact with the screw thread, and stability at the time of screw installation can be ensured.

 BEST MODE FOR CARRYING OUT THE INVENTION

 [0011] An example of an embodiment of the present invention will be described with reference to the drawings.

 As shown in FIG. 1, the screw fixture 1 according to the present invention has a cylindrical portion 10 that is open on one side and closed on the other side by a top surface 11. A flange portion 13 that protrudes around the outside of the cylindrical portion 10 is formed at the lower end on the opening side of the cylindrical portion 10.

 [0012] On the peripheral surface of the flange portion 13, irregularities including a mountain shape 13a and a valley shape 13b are continuously formed. This is to make it easier to deform the inner wall of the hole due to unevenness when the flange 13 is pressed into the hole in the flat plate, and to prevent rotation during rotation (prevent rotation). Because.

[0013] Further, four groove portions 14 are formed at the flange portion 13 side end of the cylindrical portion 10 by press-cage processing. The groove portions 14 are formed at equal intervals at positions facing each other in the cylindrical portion 10. Each of which constitutes an arcuate recess. The groove portion 14 is used to make it difficult for the screw fixture 1 to come out of the member to be fixed in the force-caulking process described later.

 The diameter of the flange portion 13 is slightly larger than the diameter of the hole in the main body frame on which the screw fixing tool 1 is mounted in order to perform the force-clamping process. The state in which the screw fixture 1 is attached to the main body frame by the caulking process will be described later.

 [0014] On the top surface 11 of the cylindrical portion 10, a hole serving as a screw groove 20 for one round is formed by press-cage processing. As shown in FIGS. 1 (a) and 1 (c), the thread groove 20 is attached to this portion with respect to a drilled hole (a hole 34 having the shape shown in FIGS. 2 and 3 described later). It is formed by deforming by press working into a shape that fits one screw thread (one round). By providing a step absorption hole 21 in the screw groove 20 (hole), a step corresponding to the screw thread can be formed in the screw groove 20 due to the presence of this portion! RU In other words, the screw groove 20 has a step corresponding to one screw thread across the step absorption hole 21 and a spiral shape corresponding to one screw thread.

 In addition, a space portion 15 in which the tip portion of the screw can be stored is formed inside the cylindrical portion 10. The length of the cylindrical portion 10 is set according to the length of the screw fixed to the screw fixture 1 and the height required for the design.

 Next, a basic manufacturing method of the screw fixture 1 having the above structure will be described with reference to FIGS.

 The screw fixture 1 is a cylindrical body having a flange portion 13 at one end and a thread groove 20 at the other end by press-carrying the strip 30 in the vertical direction by the upper die and the lower die in a flow operation. And formed.

 The series of steps shown in FIG. 2 is performed by bringing the upper and lower mold plates (not shown) arranged above and below the strip 30 made of metal pieces in synchronization with each other and moving toward and away from the strip 30. Each process is performed simultaneously with each plate clamped by each plate, and each plate is separated after the process is completed, and the strip 30 is moved to the right in the drawing by a predetermined distance. Each processing portion is sequentially moved to the next step.

First, a cylindrical body 31 having one end opened and a top surface on the other end is formed on the belt-like plate 30 by a plurality of press workings (sequential die processing) in FIGS. 2 (a) to 2 (d). 32, 33 are molded sequentially, Finally, a pressing process is performed so as to have the cylindrical portion 10 on which the top surface 11 is formed (main body forming step). In this process, a desired cylindrical body cannot be obtained by a single press process. Therefore, a cylindrical body having a cylindrical portion 10 having a desired shape can be formed by sequentially performing a plurality of press processes in a flow manner. (Fig. 2 (d)).

 [0018] Next, the top surface 11 of the molded cylindrical body is punched by a punching punch (not shown), and a long hole portion 34b is formed with respect to the substantially circular portion 34a as shown in FIG. Holes 34 are drilled (hole formation process) (Fig. 2 (e)).

 As shown in FIG. 3, the hole 34 is drilled in a shape such that the elongated hole 34b is connected to the substantially circular portion 34a. The hole 34 is formed such that the radius R1 of the hole in the left part of the figure at the connecting part of the substantially circular part 34a and the long hole part 34b that is not symmetrical in the right and left in FIG. 3 is larger than the right radius R2. Thus, the shape is asymmetrical in the vicinity of the connection between the substantially circular portion and the long hole portion. This is because, when a screw is mounted in a screw groove 21 formed by press processing, which will be described later, the screw groove portion is increased in contact with the screw thread, thereby increasing the stability of the screw mounting. This is to ensure.

 [0019] Subsequently, by applying a pressing force to the top surface 11 including the hole 34, the hole 34 is deformed, and the substantially circular portion 34a is deformed as shown in FIG. Further, by forming the step absorption hole 21 in which the long hole portion 34b is deformed, the screw groove 20 for one round is formed (screw groove processing step) (FIG. 2 (f)).

 That is, in the thread groove caching step, the elongated hole portion 34b is deformed, so that the high and low positions of the thread groove 20 as shown in FIGS. 4 (a), (b), and (c) are obtained. A step absorption hole 21 for interposing a space without a thread groove between them is formed, and the substantially circular portion 34a is deformed, whereby a spiral thread groove 20 having a height difference of one round is formed.

In addition, in the thread groove 20, the left side of FIG. 4 is the beginning of the thread pitch and the right side is the end of the thread pitch, and the thread groove 20 having the step absorption hole 21 is formed by pressing force. In this case, it is necessary to increase the number of thread grooves that are in contact with (support) the thread and bend the end side of the right screw pitch high (Figure 4 (c)). Therefore, the end position of the right screw pitch is longer than that of the left side with respect to the bending position, so that the hole 34 is asymmetric in the state of FIG. Next, two pairs (four pieces) of groove portions 14 are formed on the base portion of the cylindrical body (on the belt-like plate 30 side) so as to face each other by pressing (FIG. 2 (g)). The groove 14 is machined by incorporating a cam mechanism in the horizontal direction in the lower die, not in the normal vertical (upper / lower) press carriage, and also pressing the horizontal force (groove machining). Process).

 That is, as shown in FIG. 5, when the strip 30 moves in the direction of the arrow, four pressing plates are used against the predetermined plate 111 of the lower mold 110 that performs the processing of FIG. 2 (g). Two pairs of cam mechanisms 100 in which 103 moves from the horizontal direction with respect to the cylindrical body 10 are disposed. The direction of horizontal movement by the two pairs of cam mechanisms 100 is inclined by 45 degrees with respect to the moving direction of the strip 30, and the horizontal movements are arranged so as to intersect at right angles.

 Each of the cam mechanisms 100 includes a cam mechanism body 101 connected to the lower mold 110, a slide body 102 that moves within the cam mechanism body 101, and a slide body 102, as shown in FIGS. The pressing plate 103 is fixed to the upper die 120, and the interlocking plate 125 is connected to the upper mold 120 and operates in the vertical direction.

 A plate 121 is connected to the upper mold 120 through a buffering means 123 such as a panel so as to be movable together with the guide member 124, and a cylindrical portion 122 formed on the lower surface of the plate 121 and an upper surface of the plate 111 of the lower mold 110. The cylindrical body 10 formed in the belt-like body 30 is sandwiched between the inner side surface and the outer side surface by the cylindrical groove portion 112 formed in the above.

[0022] One end side of the stop shaft 104 is fixed to the end surface of the slide plate 102, with the other end passing through the side portion of the cam mechanism body and facing the outside, and the side portion of the cam mechanism body and the head of the stop shaft 104 are fixed. The panel 106 is pulled between the section 105 and the slide plate 102 is constantly urged outward (state shown in FIG. 7 (a)).

 At the tip of the pressing plate 103, a rectangular protrusion 107 for forming the groove 14 with respect to the base of the cylindrical body 10 is formed.

 The contact surface between the interlocking member 125 and the slide plate 102 is provided with an inclined surface 125a and an inclined surface 102a, respectively, and the vertical movement by the interlocking member 125 can be converted into a horizontal movement by sliding the inclined surfaces. (The state shown in Fig. 7 (b)).

In addition, the interlocking body 125 is a force that descends in conjunction with the plate 121 when the upper mold 120 descends in the vertical direction. The cylindrical portion 122 of the plate 121 is inserted into the cylindrical body 10 of the strip 30. Later, the position of the interlocking member 125 and the plate 121, the buffer means 123, and the like are adjusted so that the lower inclined surface 125a operates so as to contact the inclined surface 102a of the slide body 102.

Therefore, as shown in FIGS. 8 (a) and 8 (b), after the cylindrical portion 122 of the plate 121 is inserted into the cylindrical body 10 of the belt-like body 30, the slide body 103 is opposed to the pulling panel 106. The rectangular protrusion 107 at the tip of the cylinder 10 abuts against the base of the cylindrical body 10 and presses while supporting the position of the inner surface with the cylindrical part 122 (FIG. 8 (b)). The groove portion 14 can be formed with high accuracy without being deformed.

 The production of the groove 14 in the cylindrical body 10 by the cam mechanism 100 having the above-described structure also applies a four-way force to the cylindrical body 10, so that the cylindrical body can be obtained by pressing the upper die 120 and the lower die 110 once.

Four grooves 14 can be formed on 10 base side surfaces.

[0024] Then, a cut groove in which irregularities serving as the outer periphery of the flange portion 13 are repeated is formed around the cylindrical body by pressing (FIG. 2 (h)).

 Finally, by punching with a punch (not shown), the strip 30 is threaded 2

By cutting off the cylindrical body on which 0 is formed, the screw fixture 1 as a product is obtained.

(Fig. 2 (i)).

 [0025] In the series of manufacturing processes described above, the series of manufacturing processes including the formation of the thread groove 20 and the groove portion 14 are all performed by press processing (progressive die processing), so that forgetting to cut the thread is prevented and the thread cutting process is surely performed. In addition, the groove 14 can be formed without performing complicated cutting, and the presence of the groove 14 can ensure a sufficient clamping strength (a screw having the screw groove 20 and the groove 14 formed only by pressing). Fixture 1) can be obtained.

 Further, according to the manufacturing method described above, since the groove portion 14 is formed by pressing the cam mechanism 100 from four directions with respect to the cylindrical body 10, it is relatively small and the groove portion 14 is reliably engraved with a pressing force. It becomes possible to do.

[0026] In the manufacturing method described above, the force is generated by operating the cam mechanism 100 from four directions on the cylindrical body 10 to perform pre-scaling. The groove portion 14 is configured by pressing with a cam mechanism having only two opposing forces. You may do it. In this case, by setting the tip shape of the pressing plate 103 to a desired shape, for example, it is possible to form two groove portions 14 in which most of the cylindrical portion 10 is concave as shown in FIG. In this example, the groove 14 of the cylindrical body 10 is On the surface, recesses are formed in portions other than the two surface portions 10a. In each example, a plurality of groove portions are formed. However, the groove portions may be formed by pressing so as to form concave portions over the entire circumference of the cylindrical portion.

 The other parts of the screw fixture in Fig. 9 have the same configuration as the screw fixture in Fig. 1.

The same reference numerals are assigned and the description is omitted.

Next, how to use the above-described screw fixture 1 will be described with reference to FIG. 10 and FIG.

 The screw fixture 1 is for attaching the circuit board 60 to the main body frame 50 of a liquid crystal television or the like, and is used, for example, at a plurality of locations corresponding to four corners of the circuit board 60.

 [0028] First, the screw fixing tool 1 is also inserted into the plurality of holes 51 formed in the main body frame 50, respectively, with the top surface 11 side force (Fig. 10 (a)). Since the diameter of the flange portion 13 of the screw fixture 1 is formed larger than the hole 51, the flange portion 13 comes into contact with the back surface of the main body frame 50. In this state, the flange 13 is pushed into the hole 51 by pressing the screw fixing tool 1 arranged on the backing plate 100 also with the side force of the main body frame 50, and the ridge 13a and valley around the flange 13. 13b is buried on the main body frame 50 side (Fig. 10 (b), Fig. Ll (a)). At this time, the thickness of the plate of the main body frame 50 bulges 55 into the groove portion 14 and enters the groove portion 14, and is fixed to the main body frame 50 with screws so that the lower surface of the flange portion 13 is flush with the back surface of the main body frame 50. It is fixed by tool 1 force S caulking process 45 (Fig. 10 (c), Fig. 11 (b)).

 [0029] The circuit board 60 is installed on the fixed screw fixture 1, the hole 61 provided in the circuit board 60 and the top surface 11 portion of the screw fixture 1 are aligned, and a screw 70 is interposed with a washer 80 interposed therebetween. Install. Since the hole 61 formed in the circuit board 60 is formed to be larger than the screw diameter of the screw 70, the thread of the screw 70 only fits into the screw groove 20 of the screw fixture 1, and the screw 70 is screwed. As a result, the fitting part (one valley) moves to the screw base side, and the screw 70 is fastened between the screw fixture 1 and the circuit board 60 (FIG. 10 (d)).

 As shown in Fig. 10 (d), the screw fitting location is such that one trough portion 71 of the thread is located in the thread groove 20, and the screw thread top line below the trough portion 71 is in the thread groove 20. The screw 70 is fixed to the screw fixture 1 by abutting along.

[0030] According to the structure of the screw fixing device 1 described above, the screw groove 20 into which the screw 70 is screwed is formed into a series of pre-sets. Since the screw fixing device 1 in which the screw groove 20 is securely formed can be obtained, and the presence of the groove portion 14 can ensure sufficient force-tightening strength. As described in the conventional example, it is possible to prevent the generation of useless members that do not cause defective products when the screw fixture 1 is attached to the main body frame 50.

[0031] Next, a positioning screw fixture according to another embodiment of the present invention will be described with reference to the drawings.

 In the screw fixture according to this example, as shown in FIG. 12, a step 18 is provided at the tip of the cylindrical portion 10 on the side opposite to the flange portion, and a small-diameter cylindrical portion 19 having a smaller diameter than the cylindrical portion 10 is formed by pressing. Has been. The small diameter cylindrical portion 19 is configured to be blocked by the top surface 11.

 As will be described later, the small-diameter cylindrical portion 19 is formed to facilitate the positioning of the circuit board with respect to the main body frame.

 The configuration of other parts of the screw fixture of FIG. 12 is the same as that of the screw fixture of FIG.

Also, in the positioning screw fixing tool of FIG. 12, as shown in FIG. 13, two groove portions 14 that are mostly concave like FIG. 9 may be formed. That is, the groove portion 14 of the cylindrical body 10 forms a recess in a portion other than the two surface portions 10 a on the surface of the cylindrical portion 10.

 Also, it may be formed by pressing so as to form a recess over the entire circumference of the cylindrical part instead of forming a plurality of grooves! / ヽ

[0033] The positioning screw fixture 1 having the above-described step is formed by a plurality of press carriages (progressive die force force) in FIGS. 14 (a) to 14 (d) in the main body forming step with respect to the belt-like plate 30. Thus, cylindrical bodies 31, 32, and 33 having one end opened and a top surface at the other end are sequentially molded, and finally the cylindrical portion 10 in which the step 18 is formed by the small diameter cylindrical portion 19 having the top surface 11 is molded. Press processing is performed as shown.

The screw fixture 1 is formed by pressing the belt-like plate 30 a plurality of times by a flow operation to form a cylindrical body having a flange portion 13 at one end and a thread groove 20 at the other end. In the series of steps shown in FIG. 14, the plates (not shown) arranged above and below the belt-like plate 30 made of metal pieces are synchronized with each other so as to approach and separate from the belt-like plate 30. Each step is performed simultaneously with the strip 30 clamped by each plate, and after completion of the steps, the plates are separated, and the strip 30 is moved to the right in the drawing by a predetermined distance. It is performed by sequentially moving to the process.

 [0034] In this process, a desired cylindrical body cannot be obtained by a single press process. Therefore, by performing a plurality of press processes sequentially in a flow operation, the small-diameter cylindrical part 19 and the cylindrical part 10 having a desired shape are obtained. It is possible to form a cylindrical body with a step 18 having a height (FIG. 14 (d)).

 Other steps in the manufacturing method of the screw fixture of FIG. 14 are the same as those of the manufacturing method flowchart of FIG.

 Next, how to use the above-described positioning screw fixture 1 will be described with reference to FIG.

 The screw fixing tool 1 is for mounting the circuit board 60 on the main body frame 50 of an LCD TV or the like. The mounting of the screw fixing tool 1 on the main body frame 50 is a diagram illustrating the screw fixing tool of FIG. Performed in the same way as 10

 Then, the circuit board 60 is set on the screw fixture 1 fixed to the main body frame 50, and the screw 70 is attached (FIG. 15 (d)). At this time, since the small-diameter cylindrical portion 19 is configured to fit into the hole 62 of the circuit board 60, the screw 70 is inserted after aligning the hole of the circuit board 60 with the position of the top surface 11 portion of the screw fixture 1. Save time and effort.

That is, the screw fixing tool 1 for positioning according to the present invention is used when the circuit board 60 is fixed to the main body frame 50 as shown in FIG. Among the multiple fixing points X · Y arranged on the Y, use the screw fixing tool IX for positioning of the present invention for the fixing point X located on the diagonal line (Fig. 15 (d)), and to other fixing points Y As shown in Fig. 17, use a screw fixture 1Y of a type that is low in height and does not have step 18 that continues to the diameter flange S side of the small diameter cylindrical part. In the circuit board 60, the hole 61 drilled at the fixing point Y where the screw fixture 1Y without the step 18 is mounted is formed with a smaller diameter than the hole 62 drilled at the fixing point X.

If you use the screw fixing tool IX for positioning at two fixing points on the diagonal, The position of the circuit board 60 with respect to the main body frame 50 is easily determined by fitting the small-diameter cylindrical portion 19 of the fixture 1 into the hole 62, and the circuit board 60 is rotated by its rotation when the screw 70 is attached. Can be prevented from rotating.

[0037] According to the structure of the screw fixture 1 described above, the main body frame 50 and the circuit board 60 can be easily aligned due to the presence of the small-diameter cylindrical portion 19 that can be fitted into the hole 62 of the circuit board 60. it can.

 [0038] According to the structure of the screw fixture 1 of each example shown in FIGS. 1, 9, 12, and 13, the screw 70 force S and the screw groove 20 to be screwed are formed by a series of press processing. Therefore, it is possible to obtain the screw fixture 1 in which the screw groove 20 is securely formed. As described in the conventional example, the screw fixture 1 cannot be obtained when the screw fixture 1 is attached to the main body frame 50. A non-defective product is not generated, and generation of a wasted member can be prevented.

 In addition, since the groove 14 formed in the cylindrical portion 10 is also formed by pressing force, the groove 14 is provided in a series of pressing processes without performing complicated cutting that requires processing for each screw fixing tool. Can do.

 Brief Description of Drawings

 [0039] [FIG. 1] An embodiment of the screw fixing device of the present invention is shown, (a) is an explanatory plan view, (b) is an explanatory side view, and (c) is a cross-sectional view taken along line AA in the plan view. It is explanatory drawing.

 [FIG. 2] (a) to (i) are process explanatory views for explaining a manufacturing process of the screw fixture of FIG.

 FIG. 3 is a plan view showing the shape of a hole drilled in the hole forming step in the manufacturing process of the screw fixture.

 [Fig. 4] (a), (b), and (c) show the thread grooves pressed in the thread groove machining process in the manufacturing process of the screw fixture. (b) is an explanatory view taken along the arrow A, and (c) is an explanatory view taken along the line BB of (b).

 FIG. 5 is an explanatory plan view showing the positional relationship of the cam mechanism with respect to the strip in the manufacturing process of the screw fixture of the present invention.

[Fig. 6] (a) and (b) are plan explanatory views showing the operating state of the cam mechanism, (a) showing the state before the horizontal operation, and (b) showing the state after the horizontal operation. [Fig. 7] (a) and (b) are side explanatory views showing the operating state of the cam mechanism. (A) shows the state before the horizontal operation, and (b) shows the state after the horizontal operation.

 [Fig. 8] (a) and (b) are enlarged cross-sectional explanatory views for explaining the engraved state of the belt-like body by the cam mechanism, (a) is a state before horizontal operation, and (b) is a state after horizontal operation. Indicates.

FIG. 9 shows another embodiment of the screw fixture according to the present invention. (A) is an explanatory plan view, (b) is an explanatory side view, and (c) is a sectional view taken along line AA in the plan view. FIG.

 10] (a) to (d) are cross-sectional explanatory views for explaining how to use the screw fixture of FIG. 1 or FIG.

 [FIG. 11] (a) and (b) are partially enlarged cross-sectional explanatory views for explaining how to use the screw fixture of FIG. 1 or FIG.

 [Fig. 12] Another embodiment of the screw fixture of the present invention (for positioning) is shown. (A) is a plan view, (b) is a side view, and (c) is a plan view of A— It is A line sectional explanatory drawing.

 FIG. 13 shows another embodiment of the screw fixture of the present invention (for positioning), (a) is a plan view, (b) is a side view, and (c) is an A— It is A line sectional explanatory drawing.

 [FIG. 14] (a) to (i) are process explanatory views for explaining a manufacturing process of the screw fixture (for positioning) of FIG. 10 or FIG.

 [FIG. 15] (a) to (d) are cross-sectional explanatory views for explaining how to use the screw fixture (for positioning) of FIG. 10 or FIG.

 FIG. 16 is an explanatory plan view showing a state where the circuit board is fixed to the main body frame.

 FIG. 17 is a cross-sectional explanatory view showing a fixing structure when a screw fixing tool not for positioning is used.

 FIG. 18 shows the structure of a conventional screw fixture, wherein (a) is an explanatory plan view, (b) is an explanatory side view, and (c) is an explanatory sectional view.

 FIG. 19 is a cross-sectional explanatory view showing a fixed state between the main body frame and the circuit board using a conventional screw fixing tool.

Explanation of symbols

1 Screw fixing Cylindrical part Top surface Flange part Groove part Space part Step Small-diameter cylindrical part Screw groove Step absorption hole Strip plate hole Flange part Cutting groove part Caulking process Main body frame Circuit board Screw Valley part Cam mechanism Cam mechanism Main body Slide body Press plate Rectangular protrusion Lower plate Plate Cylinder Groove upper mold plate 122 Cylinder 123 Buffering means 125 Interlocking body

Claims

The scope of the claims
 [1] A screw having a flange portion that can be fixed to the flat plate by being squeezed into a hole formed in the flat plate, and a cylindrical portion that is continuous with the flange portion and has a space inside. A fixture,
 Two screw grooves are formed on the top surface that closes the anti-flange portion of the cylindrical portion by press working.
 A screw fixture characterized by that.
 [2] The screw fixture according to [1], wherein a mountain shape and a valley shape in which irregularities are continuous are formed around the flange portion.
 [3] The screw fixture according to [1], wherein a groove is formed by press working at an end of the cylindrical portion on the flange side.
 [4] The screw fixture according to claim 3, wherein a plurality of the groove portions are formed, and the groove portions are arranged at positions facing each other.
 5. The screw fixture according to claim 1, wherein a step is formed by providing a small-diameter cylindrical portion having a diameter smaller than that of the cylindrical portion on the side opposite to the flange portion of the cylindrical portion.
[6] A method of manufacturing a cylindrical screw fixture having a flange portion at one end and a thread groove at the other end by press-working the strip-like plate multiple times in a vertical direction by a flow operation. There,
 A main body forming step of forming a cylindrical body by a plurality of press operations by the upper mold and the lower mold so that one end is open and a cylindrical shape having a top surface at the other end;
 A hole forming step of drilling a hole in the top surface of the cylindrical body by pressing; and
 A thread groove processing step of forming a screw groove for one round provided with a step absorption hole on the top surface where the hole is formed;
 A cutting process step of cutting off the cylindrical body formed with the thread groove from the belt-like plate cover so as to have a flange portion around it;
 The manufacturing method of the screw fixing tool characterized by the above-mentioned.
[7] After the thread grooving step, a cam mechanism is constructed that opposes the predetermined lower mold plate by converting the vertical movement of the corresponding upper mold into a horizontal movement. Included 7. The screw fixing device according to claim 6, wherein a groove portion machining step is performed in which a groove portion is formed on the base side surface of the cylindrical body by press working by pressing from a horizontal direction facing the cylindrical body. Production method.
8. The method for manufacturing a screw fixture according to claim 7, wherein in the groove portion machining step, two pairs of the cam mechanisms are arranged, and four groove portions are simultaneously formed in the cylindrical body.
[9] In the hole forming step, the hole to be drilled on the top surface of the cylindrical body by a press process has a basic shape in which a long hole is connected to a circular part, and is near the connection between the circular part and the long hole. 7. The method for manufacturing a screw fixture according to claim 6, wherein the screw fixing tool has an asymmetric shape.
PCT/JP2007/063399 2006-07-10 2007-07-04 Screw fixing device and method of manufacturing screw fixing device WO2008007593A1 (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
JP2006188840 2006-07-10
JP2006-188840 2006-07-10
JP2007000753U JP3131207U (en) 2007-02-08 2007-02-08 Screw fixture
JP2007000752U JP3131392U (en) 2007-02-08 2007-02-08 Screw fixture
JP2007-000752U 2007-02-08
JP2007-000753U 2007-02-08
JP2007-113483 2007-04-23
JP2007113483A JP5019593B2 (en) 2007-04-23 2007-04-23 Manufacturing method of screw fixture

Publications (1)

Publication Number Publication Date
WO2008007593A1 true WO2008007593A1 (en) 2008-01-17

Family

ID=38923155

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2007/063399 WO2008007593A1 (en) 2006-07-10 2007-07-04 Screw fixing device and method of manufacturing screw fixing device

Country Status (1)

Country Link
WO (1) WO2008007593A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010260058A (en) * 2009-04-30 2010-11-18 Watoku Co Ltd Method for manufacturing spacer nut
CN101676066B (en) 2008-09-18 2011-05-18 大唐移动通信设备有限公司 Realization process of curved surface mesh metal plate deep notch sculpt

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4930761U (en) * 1972-06-23 1974-03-16
JPS57167508U (en) * 1981-04-15 1982-10-22
JPH0319115U (en) * 1989-07-05 1991-02-25
JP2004138167A (en) * 2002-10-18 2004-05-13 Fukui Byora Co Ltd Press fitted and fixed type fastener
JP2004330208A (en) * 2003-04-30 2004-11-25 Seiko Epson Corp Female screw member, method for manufacturing female screw member, and device for manufacturing female screw member

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4930761U (en) * 1972-06-23 1974-03-16
JPS57167508U (en) * 1981-04-15 1982-10-22
JPH0319115U (en) * 1989-07-05 1991-02-25
JP2004138167A (en) * 2002-10-18 2004-05-13 Fukui Byora Co Ltd Press fitted and fixed type fastener
JP2004330208A (en) * 2003-04-30 2004-11-25 Seiko Epson Corp Female screw member, method for manufacturing female screw member, and device for manufacturing female screw member

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101676066B (en) 2008-09-18 2011-05-18 大唐移动通信设备有限公司 Realization process of curved surface mesh metal plate deep notch sculpt
JP2010260058A (en) * 2009-04-30 2010-11-18 Watoku Co Ltd Method for manufacturing spacer nut
KR101237240B1 (en) * 2009-04-30 2013-02-27 와토쿠 컴퍼니 리미티드 Spacer nut manufacturing method

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