JP2014155952A - Method for manufacturing hollow screw and nut, and hollow screw - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high efficient manufacturing method of a screw while reducing weight of the screw.SOLUTION: A screw is made as a hollow screw 1. A method for manufacturing the hollow screw 1 makes the hollow screw share a male screw and a female screw by pressing a metal plate with a pair of male and female press dies where a plurality of parallel protrusions is disposed and by rounding processing. The hollow screw 1 shares the male screw and the female screw by pressing the metal plate with the pair of male and female press dies where the plurality of parallel protrusions is disposed and by the rounding processing.

Description

  The present invention relates to a method of manufacturing a hollow screw and a nut and a hollow screw, and more particularly, to a hollow screw and a nut that have a light weight, further tightening force, increase manufacturing efficiency, and in addition, can save material. The present invention relates to a manufacturing method and a hollow screw.

  Conventionally, for the manufacture of screws and nuts, taps, dies, and milling cutters are used to screw up the outer circumference of solid round bars and conical bars, or in the case of nuts, to the inner wall surface of the formed central through hole. Made by doing.

  However, especially in the case of screws, according to the manufacturing method described above, it becomes a solid state, and the weight increases accordingly. Because it does not have elasticity, the size of the target to be used is also fixed, and a plurality of screws according to the target are required, and it is possible to obtain a holding force exceeding the fastening force of the screw. Can not.

  Furthermore, since the normal screw is in a solid state as described above, it is limited to use as a male screw, and one screw cannot be used as a female screw mode, and the usage mode is specified.

  In addition, the gazette shown as Patent Document 1 discloses a technique in which a part of a product is rounded and a screw is engraved on the outer surface. In this case, the screw is a part of a component. In addition, the present invention is different from the present invention in which only the external male screw is present and the internal screw is also shared, and the intended purpose thereof is also different.

  Furthermore, the publications shown as Patent Documents 2 and 3 show a technique for rounding a metal plate to make a tube (particularly for an injection needle), but the presence of a screw is not shown, and is not intended. The purpose to do is different.

JP 2008-8469 A JP 2003-136142 A JP 2007-38021 A

  The problem to be solved by the present invention is that since the conventional screw is in a solid state, each of the male screw and the female screw can only have its own action, and particularly in the case of a screw, it is in a solid state. When the weight is increased and many are used, the weight reduction of the target product is hindered.

  Furthermore, conventional screws are in a solid state, and since they are tapped, the efficiency is low and the price increases, and only the specified size can be accommodated. The point was that we could not gain power.

  In order to solve the above-described problems, a method for manufacturing a hollow screw according to the present invention is a method of pressing a metal plate with a pair of male and female press dies provided with a plurality of parallel protrusions, rounding and processing the male screw. The above-described rounding process is characterized in that a pair of half pipes whose side edges are integrally connected are rotated around the connecting portion to form a cylindrical shape. The press using a press die is characterized in that a screw operating head is also formed at the same time.

  The hollow screw manufacturing method according to the present invention is characterized in that the hollow screw described above is rounded, and a slit is formed in the opposite side edge, and the thread of the hollow screw is along the axial direction. It is characterized in that the pitch position is shifted, and the above-mentioned head for operating the screw is molded separately from plastic, and is integrated by press fitting or insert molding into the end of the hollow screw obtained by pressing. In the center of the operation head described above, a through hole communicating with the inside of the hollow screw is formed.

  In the nut manufacturing method according to the present invention, the metal plate is pressed with a press die provided with a plurality of parallel protrusions, and the half pipe with the side edges integrally connected is rotated about the connecting portion as an axis. It is characterized by a cylindrical shape having at least an internal thread on its inner surface, and a metal plate is pressed with a pair of press dies provided with a plurality of parallel protrusions, and rounded to share a short thread and a female thread. A hollow screw is formed, and a plastic head is attached to the outer surface of the hollow screw.

  Furthermore, the hollow screw according to the present invention is characterized in that a metal plate is pressed with a pair of male and female press dies provided with a plurality of parallel protrusions, rounded, and shares a male screw and a female screw, The hollow screw described above is characterized in that a slit is formed along the axial direction, and the screw thread of the hollow screw described above is characterized in that the pitch position is shifted in the axial direction.

  The hollow screw according to the present invention is characterized in that the operation head of the hollow screw is formed of plastic and is press-fitted or insert-molded at the end of the hollow screw. A through-hole communicating with the inside of the hollow screw is formed in the center of the head, and the core member is inserted into the hollow screw from the through-hole of the head and used by the core member. It is characterized in that the state is locked, and at least the outer peripheral surface of the core member is tapered.

  The manufacturing method of the hollow screw and nut according to the present invention is configured as described above. Especially for hollow screws, the weight can be significantly reduced and the material can be saved. In the case of nuts, the production efficiency can be improved and the product cost can be reduced.

  In addition, when a hollow screw is provided with a slit or a so-called guichi structure, the size of the target female screw or male screw is not limited, and even if there is a slight difference in diameter, it will be absorbed and a stronger tightening force The core material is screwed or press-fitted into the hollow screw, whereby a strong lock state can be formed from the hollow screw.

It is a front view which shows a hollow screw. It is a left side view. It is a front view which shows the half pipe shape before rounding. It is a right view. It is a front view which shows before the rounding process which shows another manufacturing method. It is a right view. It is a front view which shows the hollow screw which formed the slit. It is a right view. It is a front view which shows the example which shifted the pitch of the thread. It is a left side view. It is a front view showing an example where a plastic operation head is crowned. It is a left side view. It is a front view which shows the example which made the plastic operation head insert. It is a left side view. It is a front view which shows the example which covered the operation head made from plastic with another structure. It is a left side view. It is a front view which shows the example which provided the through-hole connected to the inside in the head for operation. It is a left side view. It is a front view which shows the nut which carried out the rounding press process. It is a left side view. It is a front view which shows the example which integrated the short hollow screw and nut. It is a front view which shows the nut which attached the plastic operation part to the outer periphery. It is a left side view. It is a front view which shows the core material which has a screw. It is a right view. It is a front view which shows the core material which made the outer surface taper. It is a right view.

  This was realized by configuring as illustrated in the drawings and described in the examples.

  Next, a preferred basic hollow screw and a manufacturing method thereof will be described with reference to FIGS. 1 shows a hollow screw according to the present invention. As will be described later, the hollow screw 1 rounds a metal plate pressed with a male and female press die having parallel protrusions, and has an outer edge thereof. The hollow screw 1 is integrally provided with a hexagonal operation head 2 that receives a rotational operation with a wrench at one end. . Therefore, a straight seam 3 is formed at a part of the outer surface along the axial direction of the hollow screw 1 and at the center of the operation head. The operation head 2 can be molded simultaneously with the threaded portion by providing a male and female press mold with a molding portion.

  The pressed and rounded hollow screw 1 becomes a male screw having a screw thread 4 on the outer peripheral surface, and a female screw in which the screw groove 5 by the screw thread 4 becomes a screw thread is simultaneously formed on the hollow inner surface. It will be.

  For producing the hollow screw 1 described above, a flat metal plate is pressed with a male and female press mold having parallel protrusions as described above, and first, the thread 4 and the thread groove 5 shown as FIGS. And a half pipe 1a integrally having a portion 2a corresponding to the head 2 for operation. Then, the hollow pipe 1 is formed by rounding the half pipe 1a so that both outer edges thereof are in contact with each other. In the case of this embodiment, the abutted seam 3 is fixed by welding.

  In the rounding process described above, the metal thickness of the half pipe 1a is rolled to approximately one half. The portion 2a corresponding to the operation head 2 is formed with five corners in advance, the corners are rolled, and the edges are contact-welded to form a hexagonal operation head 2. .

  Moreover, the method shown as FIG. 5, FIG. 6 as a manufacturing method of the hollow screw 1 can also be used. In the case of this manufacturing method, a pair of half pipes 1b and 1b having a thread 4 and a thread groove 5 are simultaneously formed by pressing, and adjacent side edges of the half pipes 1b and 1b are integrally formed by a connecting portion 6. It is connected. Further, a half-pipe-shaped portion 2b corresponding to the operation head is integrally formed at the end of one half-pipe 1b, and another half-pipe-shaped portion 2b is connected to one edge of 2b. 6a is integrally connected.

  From this state, the half pipe 1b which does not have the half pipe-shaped portion 2b corresponding to the operation head is rotated around the connecting portion 6 and is brought into contact with the other half pipe 1b to form a hollow screw. Further, the half-pipe-shaped portion 2b corresponding to the operation head is formed by rotating and contacting the other portion 2b with the connecting portion 6a as an axis. In this case, it is not necessary to roll and round the material, and the hollow screw 1 can be obtained simply by rotating and matching the half pipes 1b, 1b and 2b, 2b.

  Next, a second embodiment of the present invention will be described with reference to FIGS. In the second embodiment, parts common to the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. Any one of the same methods as described above is used as the method of manufacturing the hollow screw 7 in the second embodiment. In the hollow screw 7 of the second embodiment, a slit 8 is formed in a part of the screw portion along the axial direction. Due to the presence of the slit 8, the screw portion is cushioned and can be forcibly screwed to an object having a diameter smaller than the nominal diameter of the hollow screw 7. When 7 is an internal thread, an external thread having a large nominal diameter can be received.

  A third embodiment of the present invention will be described with reference to FIGS. Also in the third embodiment, the same reference numerals are given to the portions common to the above-described embodiments, and the detailed description is omitted. In this third embodiment, the seam 3 is integrated or separated, and the thread 4 and the screw groove 5 are intentionally formed so-called guichi by shifting the pitch position at the seam 3 portion. is there.

  In this third embodiment, the operation head 2c has a flat plate shape, and a receiving groove 10 for receiving the tip of a flathead screwdriver is provided along the joint 3. In this embodiment, the thread portion can be cushioned along the axial direction, and when this hollow screw 7 is used, it is propelled while forcibly correcting the positional deviation of the pitch, so this fastening force is restored. Combined with the power to try, it becomes powerful.

  Next, a fourth embodiment will be described with reference to FIGS. Also in this example, the same reference numerals are given to portions common to the above-described embodiment, and detailed description thereof is omitted. The hollow screw 11 is integrally formed at one end with a receiving portion 12 to which a head 2d for operation formed as a bottomed shape is fitted in a crown. In this case, the operation head 2d is separately molded of plastic, and a fitting hole 14 formed on the back surface is press-fitted or insert-molded into the receiving portion 12. The operation head 2d is formed with a cross groove 13 for receiving the tip of a Phillips screwdriver.

  The fifth embodiment will be described with reference to FIGS. Even in this example, the same reference numerals are given to portions common to the above-described embodiment, and detailed description thereof is omitted. The hollow screw 15 in the fifth embodiment is integrally formed with a receiving portion 16 having a circular cross section for receiving the operating head at one end. The receiving portion 16 accommodates a cylindrical operation head 2e made of plastic by press fitting or insert molding. At the center of the surface of the operation head 2e, a tip of a tool normally used as a nut driver is fitted, and a hexagonal concave hole 17 for operation is formed.

  Further, the sixth embodiment will be described with reference to FIGS. Even in this example, the same reference numerals are given to portions common to the above-described embodiment, and detailed description thereof is omitted. As in the fourth embodiment, the hollow screw 18 is integrally formed with a receiving portion 12 having a bottomed shape at one end, and the fitting hole 14 of the operation head 2f is press-fitted into the receiving portion 12. Yes. A hexagonal concave hole 17 similar to that of the fifth embodiment is formed at the center of the surface of the operating head 2f.

  Next, a seventh embodiment of the present invention will be described with reference to FIGS. Even in this example, the same reference numerals are given to portions common to the above-described embodiment, and detailed description thereof is omitted. The hollow screw 19 is integrally formed with an operation head 2g having a hexagonal shape at one end. A through-hole 20 that communicates with the inside of the hollow screw 19 is provided in the center of the operation head 2g. By providing this through-hole 20, the core material 21 or 22 shown in FIG. 24 to FIG. 27 is fed into the hollow screw 19 from the through-hole 20, and the hollow screw 19 is sent from the inner side by the core materials 21 and 22. The 19 fastening states can be locked.

  The core material 21 shown in FIGS. 24 and 25 has a conical shape (tapered shape) whose one end gradually decreases in diameter, and an external thread 23 is formed on the outer periphery to form the inner groove 4a of the thread 4 of the hollow screw 19. A V-shaped cut groove 24 that gradually decreases in width from the large diameter portion to the small diameter portion is provided on the peripheral surface passing through the center line so as to have an overall cushioning property. is there. A hexagonal hole 25 for operating the core material 21 is formed at the center of the core material 21 in the axial direction, and the V-shaped kerf 24 communicates with the hexagonal hole 25. doing.

  Further, the core material 22 shown in FIGS. 26 and 27 is formed in a truncated cone shape (tapered shape), and a columnar protrusion 26 for operation is integrally projected at the center of the large diameter portion side. . The core material 22 is used by being press-fitted into the through hole 20 of the hollow screw 19 from the small diameter side, and is applied with tension from the inside to lock the fastening state of the hollow screw 19. It becomes.

  Subsequently, an embodiment as a nut will be described with reference to FIGS. 19 and 20. The nut 27 is also formed by the same pressing and rounding as described above, and has a seam 28. A female screw 30 is formed on the inner wall surface of the center hole 29 as the nut 27. Of course, the nut 27 can be used as a female screw corresponding to a male screw depending on the usage mode such as burying.

  Next, a modified embodiment as a nut will be described with reference to FIG. Portions common to the eighth embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. The nut 31 is thinner than the nut 27 in the eighth embodiment, and a short hollow screw 32 is integrally connected to one opening edge of the center hole 29 to ensure the continuous length of the female screw 30. doing. The short hollow screw 32 can be screwed onto an existing female screw or male screw, or used as a male screw fixing member.

  Next, another modified embodiment as a nut of the present invention will be described with reference to FIGS. The nut 33 shown here is obtained by fixing a hexagonal operation portion 36 made of plastic to the outer peripheral surface of a pressed and rounded hollow screw 34 by a technique such as insert. In the figure, reference numeral 35 denotes a female screw formed on the inner peripheral surface of the hollow screw 34 for acting as a nut, and 37 denotes a seam during rounding.

  The embodiment according to the present invention is configured as described above. In particular, coarse screws are intended for hollow screws, but by changing the press die, hollow screws having other configurations such as conical screws, fine screws, trapezoidal screws, and the like can be obtained. The material metal for the hollow screw and nut can be selected from iron, aluminum, duralumin, titanium, stainless steel, etc., and the plastic material used is preferably engineering plastics such as PBT, nylon, polyacetal, PEI, PEEK Super engineering plastics such as PI can also be used.

1, 1a, 1b, 7, 9, 11, 15, 18, 19, 34 Hollow screw 2, 2a, 2b, 2c, 2d, 2e, 2f, 2g Operation head 3, 28, 37 Seam 4 Thread 4a Inner surface groove 5 Thread groove 6, 6a Connecting portion 8 Slit 10 Receiving groove 12 Receiving portion 13 Cross groove 14, 17 Recessed hole 16 Receiving portion 20 Through hole 21, 22 Core material 23 Male thread 24 Cut groove 25 Hole 26 Projection 27, 31 , 33 Nut 29 Center hole 30, 35 Female thread 36 Operating section

Claims (16)

  A method for producing a hollow screw, wherein a metal plate is pressed with a pair of male and female press dies provided with a plurality of parallel protrusions and rounded to share a male screw and a female screw.   2. The method of manufacturing a hollow screw according to claim 1, wherein the rounding is performed by rotating a pair of half pipes whose side edges are integrally connected to each other with the connecting portion as an axis.   3. The method for producing a hollow screw according to claim 1, wherein the press using the press die simultaneously forms a head for operating the screw.   4. The method for manufacturing a hollow screw according to claim 1, wherein the hollow screw is rounded, and a slit is formed at an opposite side edge.   5. The method for manufacturing a hollow screw according to claim 1, wherein the pitch of the screw thread of the hollow screw is shifted along the axial direction. 6.   The operation head of the above-mentioned screw is separately molded with plastic, and is integrated by press-fitting or insert molding into the end of the hollow screw obtained by press working. The method for producing a hollow screw according to any one of Items 2, 4, and 5.   The hollow screw manufacturing method according to claim 1, wherein a through hole communicating with the inside of the hollow screw is formed in the center of the operation head.   The metal plate is pressed with a press die provided with a plurality of parallel ridges, and the half pipe with which side edges are integrally connected is rotated around the connecting portion as an axis to form a cylindrical shape having at least an internal thread on the inner surface. A nut manufacturing method characterized by the above.   A metal plate is pressed with a pair of press dies provided with a plurality of parallel protrusions, rounded to form a short hollow screw that shares a male screw and a female screw, and the outer surface of the hollow screw is made of plastic. A method for manufacturing a nut, comprising attaching a head.   A hollow screw characterized in that a metal plate is pressed with a pair of male and female press dies provided with a plurality of parallel protrusions, rounded, and shares a male screw and a female screw.   The hollow screw according to claim 10, wherein the hollow screw has a slit formed along the axial direction.   The hollow screw according to claim 10 or 11, wherein a pitch position of the thread of the hollow screw is shifted in an axial direction.   The hollow screw according to any one of claims 10 to 12, wherein the operation head of the hollow screw is formed of plastic and is press-fitted or insert-molded at an end of the hollow screw.   The hollow screw according to any one of claims 10 to 13, wherein the hollow screw is formed with a through hole communicating with the inside of the hollow screw at the center of the head.   The hollow screw according to claim 14, wherein a core member is inserted into the hollow screw from the through hole of the head and the use state is locked by the core member.   The hollow screw according to claim 15, wherein at least the outer peripheral surface of the core member is tapered.

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