JP2006187881A - Transmission device of rotatory power to spin welding pin and spin welding pin - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the shift of a spin welding pin in a spin welding process. <P>SOLUTION: This device for transmitting the rotatory power from a rotary tool to a spin welding pin 30 made of a thermoplastic resin is constituted so as to penetrate the spin welding pin 30 into a base material made of the thermoplastic resin while rotating the same at a high speed to melt and fix both of them by the friction heat due to rotation and comprises a the bit 10 on a rotary shaft capable of being locked with the part to be locked of a pin head part 31, a means 20 for temporarily holding the pin to the bit and a means capable of releasing the holding of the pin in a rotary state. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a device for transmitting a rotational force to a spin welding pin used for spin welding for welding thermoplastic resin members by frictional heat between rotating members and a spin welding pin.

  As a method for joining plastic members, spin welding is known in which a thermoplastic resin pin is brought into contact with a fixed thermoplastic resin substrate while rotating, and both are welded by frictional heat generated by rotation (known) As an example, Patent Document 1). In this type of welding method, the surfaces of the members are in contact with each other and welded, and a pin that rotates at a high speed is pressed into a thick base material, and the base material and the outer wall of the pin are irregularly connected to each other. It has also been proposed to be deformed into a complicated shape, and to be intricately fixed (Patent Document 2 as a known example).

Since the above-mentioned spin welding method can join plastic members without using an adhesive, it is a useful means that can avoid poor appearance and increased process due to whitening of the bonded portion by the adhesive, especially the latter conventional In the technology, the resin at the outer peripheral portion of the pin melted by frictional heat due to rotation is diffused and deformed in the form of a fluff by centrifugal force, and this is a state in which the melted resin of the base material is involved and irregularly shaped with each other The phenomenon that becomes. Therefore, by solidifying at this stage, it is possible to realize joining in a state where both are intricately physically fitted rather than in a fused state in which they are melted and chemically integrated. Therefore, there is an effect that it is possible to firmly join the thermoplastic resins and polypropylene which have been difficult to join due to the problem of compatibility.
JP-A-10-16055 Japanese Patent Application No. 2003-416499

  By the way, in the above-described spin welding method, as a means for imparting rotation to the pin, the pin is locked to the tip of a rotary tool such as an electric drill or a driver and rotated. However, unlike the case where drill teeth or screws are inserted into a rigid member, since both the base material and the pin are softened by melting in spin welding, it cannot be expected to support the pin by the base material, and the rotary tool If the pin is simply locked to the tip, the rotating pin may scatter in the base material, and accurate positioning may not be performed.

  In the above case, it is an easily conceivable matter to firmly fix the pin to the tip of the rotary tool using a known chuck. However, when the fixing by the chuck is released, a relative force is also applied to the pin side, and if the fixing is released in a state where the molten resins are not solidified, the pin may be tilted or shifted, and the pin is completely solidified. There was an inconvenience that had to wait until. In the latter prior art, it is desirable to stop the rotation of the component instantaneously when the melted base material and the outer wall of the pin are involved in an irregular shape. In order to prevent the pin from tilting or shifting due to tilt or movement, it is necessary to immediately pull the rotary tool away from the pin. However, as described above, the fixing by the chuck could not be removed immediately.

  The present invention was created for the purpose of providing a device for transmitting a rotational force to a spin welding pin that has solved the above-mentioned problems of the prior art. That is, the rotational force transmission device to the spin welding pin of the present invention is a spin welding device that melts and fixes both by the frictional heat of rotation by press-fitting into a thermoplastic resin base material while rotating at high speed. A device for transmitting the rotational force from the rotary tool to the pin made of thermoplastic resin, and temporarily holding the pin on the bit on the rotating shaft that can be locked to the locked portion of the pin head and the bit. And means capable of releasing the holding while being rotated.

  Further, here, as the second invention, in the first invention, there is a bit fixed to the tip of the rotating shaft, and a gripping member for gripping the body of the pin whose head is locked to the bit, The gripping member is provided with a plurality of gripping claws protruding from the base portion slidably inserted in the axial direction of the rotating shaft and extending and contracting in the gripping direction, and is gripped by the gripping claws. The sliding gripping member grips the body of the pin with the tip of the gripping claw positioned in front of the tip of the bit in the forward direction, and in the backward direction. Also disclosed is a device for transmitting a rotational force to a spin welding pin that retreats backward from the tip of the bit while being pushed open in the gripping and releasing direction against the urging force when the back side of the tip of the gripping claw passes over the outer periphery of the bit.

  Further, here, in the first invention as the third invention, the bit is a box bit having a locking hole corresponding to the outer shape of the pin head, and the suction pad is in close contact with the surface of the pin head in the locking hole In addition, a device for transmitting a rotational force to a spin welding pin in which the suction pad is provided with a nozzle hole that performs not only air suction but also ejection is also disclosed.

  According to the present invention configured as described above, since the pin is held by the bit on the rotating shaft, the rotating pin is supported by the rotating tool and is not displaced in the base material, thereby achieving accurate positioning. In addition, since the above holding can be released in the rotating state, if the holding by the rotating tool is released when the melted base material and the outer wall of the pin are in an irregular shape, the rotating tool can be brought into inertia. The rotation of the pin stops instantaneously, and the molten resin gradually cures in the process of gradually decreasing the rotation of the part due to inertia, and the resin that is in an irregular shape with each other may be destroyed. Is prevented.

  Further, according to the second invention, when the pin advances a predetermined amount in the base material, the tip of the gripping claw of the gripping member comes into contact with the surface of the base material or the member to be attached to the base material, and the shaft is rotated. Backward, the back side of the tip of the gripping claw moves over the outer periphery of the bit, so that the pin is automatically released from the tip of the bit while being pushed open in the direction of gripping release against the urging force. Produces an effect.

  According to the third aspect, the pin is held by the bit by suction, and the holding is immediately released by stopping the suction. In this case, the above-described release is performed more quickly by ejecting air from the nozzles in the suction pad, and there is also an effect of promoting the cooling and solidification of the pin melted by the ejected air.

  1 to 8 are views showing an embodiment of the rotational force transmission device 1 of the second invention. In the figure, reference numeral 1 denotes a rotary shaft. Here, a rotational force is applied from the rotary tool by inserting and locking a plug portion 3 provided at one end into a socket D of a rotary tool such as an electric drill or a screwdriver. Reference numeral 10 in the figure is a bit fixed in front of the rotary shaft 1, and here, a box bit having a locking hole portion 11 corresponding to the outer shape of the head portion 31 of the pin 30 is employed. On the other hand, when the guide shaft 5 is inserted into the hole 4 drilled in the axial direction at the tip of the rotary shaft 1 and the pin 30 is inserted into and locked in the locking hole portion 11 of the bit 10, By sliding the guide shaft tip into the guide hole 32 provided in the axial direction, the center of the pin is regulated to the center position of the rotation shaft, thereby preventing the shake of the pin during rotation.

  In the figure, reference numeral 20 denotes a gripping member for holding the pin 30 inserted and locked in the bit 10 so as not to drop off, and is extrapolated through the bush 23 so as to be slidable in the axial direction of the rotary shaft 2. It is. The gripping member 20 is provided with a plurality of gripping claws 22 (two cases shown here) projecting from the distal end of the base 21 so as to grip and detach the pins 30 and expand and contract in the gripping direction. In this embodiment, the gripping member is integrally formed of an elastic material such as plastic, thereby providing the gripping claw with a biasing force in the gripping direction. (See FIG. 5 and FIG. 6 in particular). The gripping claw 22 is bent in a square shape toward the axial direction of the rotary shaft 2 so that the body of the pin 30 fitted and locked in the bit 10 can be gripped.

  1 to 3 are diagrams illustrating the operation of the rotational force transmission device 1. FIG. 1 shows a state in which the pin 30 is held in the above-mentioned device. The head portion 31 of the pin is fitted and locked in the locking hole portion 11 of the bit 10 and the guide shaft 5 is slid into the guide hole 32. Is done. At this stage, when the gripping member 20 is advanced forward, the tip of the gripping claw 22 protruding forward of the bit 10 grips the body of the pin 30 by the urging force.

  Next, when the pin 30 advances a predetermined amount in the base material, the tip of the gripping claw 22 of the gripping member 20 comes into contact with the surface P of the base material or a member to be attached to the base material, and the pin 30 moves backward on the rotary shaft 2. Then, when the back side of the tip of the gripping claw passes over the outer periphery of the bit 10, it is retracted backward from the tip of the bit while being pushed open in the gripping and releasing direction against the urging force (see FIG. 2). In this case, the tip of the gripping claw 22 of the gripping member 20 is stopped at the retracted position when the back side falls into the annular groove 12 recessed in the outer periphery of the bit 10 (see FIG. 3). Further, on the rotating shaft 2, a stopper that abuts the bush 23 at a position where the bush 23 is moved backward by a predetermined amount in order to prevent the gripping claw 22 of the gripping member 20 from going over the annular groove 12 and moving further forward. 6 is fixed.

  9 to 12 are views showing an example of a pin suitable for the rotational force transmission device 1 of the second invention. This pin 30 is molded from a thermoplastic resin, and the outer periphery of the head portion 31 swelled with respect to the body portion has a locking shape (here, the locking hole portion 11 of the bit 10 of the rotational force transmitting device 1). A guide hole 32 in which the guide shaft 5 is slidably fitted is formed in the axial direction. Further, the tip 33 of the pin 30 is configured in a conical shape so as to obtain a positioning effect at the time of spin welding. The pin 30 is provided with a washer 34 fitted to the body portion, and when the washer is held by the rotational force transmission device, the washer is held at the tip of the gripping claw 22 of the gripping member 20 and the base material or base material. By interposing between the surfaces P of the members that are attached to each other, the rotating gripping claw tip is prevented from coming into direct contact with the substrate or the surface of the member that is attached to the substrate.

  13 and 14 show different embodiments of the pins. The pin 40 has a structure having a head 41, a guide groove 41, and a washer (not shown) similar to those in the above-described embodiment, and a hole 43 is provided at the tip in the axial direction. It can be expected that a part of the base material melted at the time of spin welding enters the above-mentioned hole 43, thereby improving the straightness and preventing blurring.

  15 and 16 are views showing an embodiment of the rotational force transmitting device 50 of the third invention. In the figure, reference numeral 51 denotes a rotating shaft. Here, a plug 52 provided at one end is inserted into and locked in a socket (not shown) of a rotating tool such as an electric drill or a screwdriver to give a rotating force from the rotating tool. It is done. Reference numeral 52 in the figure is a bit fixed in front of the rotary shaft 51, and here, a box bit having a locking hole 53 corresponding to the outer shape of the head 71 of the pin 70 is employed. A suction pad 54 in close contact with the surface 72 of the pin head 71 is provided in the locking hole 53. The suction pad 54 is formed in a shape along the surface 72 of the pin head 71 by an elastic material such as an elastomer, and is arranged at a position where the pin head abuts when the pin is inserted into the bit 52 and locked. In addition, a nozzle 55 is provided at the center.

  On the other hand, air circuit members 60 and 61 inserted through the nozzle 55 are rotatably fitted on the rotating shaft 51 to supply and exhaust the nozzle 55.

  FIG. 15 shows a state in which the pin 70 is held by the rotational force transmission device 50, and the head portion 71 of the pin is fitted and locked in the locking hole 53 of the bit 70, and the bit 70 is sucked by the suction pad 54. Retained.

  FIG. 16 is a view showing a state in which the holding of the pin 70 to the rotational force transmission device 50 is released. In order to cancel the suction by the suction pad 54, it is sufficient to eliminate the negative pressure from the nozzle 55, but here, the suction is released more quickly by ejecting air from the nozzle. Further, in this case, a combined effect that promotes cooling and solidification of the melted pin by the ejected air is also produced.

  17 to 20 are views showing an example of a pin suitable for the rotational force transmission device 50 of the third invention. The pin 70 is molded from a thermoplastic resin, and the outer periphery of the head 71 swelled with respect to the trunk portion has a locking shape corresponding to the locking hole 53 of the bit 52 of the rotational force transmitting device 50 (here, The head surface 72 is further formed into a spherical shape in order to enhance the suction action of the suction pad 54. On the other hand, a hole 73 is provided at the tip of the pin 70 in the axial direction. It can be expected that a part of the base material melted at the time of spin welding enters the above-described hole 73, thereby improving the straightness and preventing the blurring.

The partially cutaway side view at the time of pin holding | maintenance of the rotational force transmission apparatus of 2nd invention. The partially notched side view which shows the cancellation | release process of pin holding | maintenance same as the above. FIG. 3 is a partially cutaway side view of the pin holding released state. The side view of the state which removed the holding member and bush of the rotational force transmission apparatus of 2nd invention. The side view of the holding member and bush of the rotational force transmission apparatus of 2nd invention. The top view of the bush of the rotational force transmission apparatus of 2nd invention. The side view at the time of pin holding of the rotational force transmission apparatus of 2nd invention. The side view of the cancellation | release state of pin holding | maintenance same as the above. Pin side view Same as above, sectional view Same as above, top view of washer Pin top view Side view of different embodiment pins Same as above, sectional view The partially notched side view at the time of pin holding | maintenance of the rotational force transmission apparatus of 3rd invention. FIG. 3 is a partially cutaway side view of the pin holding released state. Pin side view Same as above, sectional view Same as above, top view Same as above, bottom view

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotational force transmission apparatus of 2nd invention 2 Rotating shaft 10 Bit 20 Gripping member 22 Gripping claw 30 Pin 50 Rotating force transmission apparatus of 3rd invention 51 Rotating shaft 52 Bit 54 Suction pad 55 Nozzle 70 Pin

Claims (8)

  Rotating force from a rotary tool is transmitted to a spin-welded thermoplastic resin pin that melts and adheres to both by means of frictional heat due to rotation by press-fitting into a thermoplastic resin substrate while rotating at high speed. The device has a bit on the rotating shaft that can be locked to the locked portion of the pin head, means for temporarily holding the pin on the bit, and means that can release the holding while being rotated. A device for transmitting a rotational force to a spin welding pin.   There is a bit fixed to the tip of the rotating shaft, and a gripping member whose head grips the body of the pin locked to the bit, and the gripping member is slidable in the axial direction of the rotating shaft A gripping mechanism that has a structure in which a plurality of gripping claws extending and contracting in the gripping direction are provided at the distal end of the base portion to be extrapolated and a biasing force in the gripping direction is applied to the gripping claws. In the forward direction, the holding member has a tip of the gripping claw positioned in front of the tip of the bit to grip the body of the pin, and in the backward direction, the back side of the tip of the gripping claw gets over the outer periphery of the bit. 2. A device for transmitting a rotational force to a spin welding pin according to claim 1, wherein the rotation force is retracted backward from the tip of the bit while being pushed open in the direction of gripping and releasing.   The bit is a box bit having a locking hole corresponding to the outer shape of the pin head, and a guide shaft that can be inserted into a guide hole drilled in the axial direction from the pin head is disposed in the locking hole. The rotational force transmission device to the described spin welding pin.   4. A device for transmitting a rotational force to a spin welding pin according to claim 2 or 3, wherein the gripping member is integrally formed of an elastic material to apply a biasing force in the gripping direction to the gripping claw.   The bit is a box bit having a locking hole portion corresponding to the outer shape of the pin head, and a suction pad that is in close contact with the surface of the pin head is provided in the locking hole portion. The rotational force transmission device to the spin welding pin according to claim 1, wherein a nozzle hole is also provided.   In a pin made of thermoplastic resin for spin welding, which is melted and fixed by frictional heat due to rotation by press-fitting into a thermoplastic resin base material while rotating at high speed, an axial direction is applied to the head of the pin. A spin welding pin characterized by providing a hole.   In the pin made of thermoplastic resin for spin welding, which is melted and fixed by frictional heat by rotation by press-fitting into a thermoplastic resin base material while rotating at high speed, the tip of the pin has a conical shape A spin welding pin characterized by that. In a pin made of thermoplastic resin for spin welding that is melted and fixed by frictional heat due to rotation by press-fitting into a thermoplastic resin base while rotating at high speed, an axial hole is formed at the tip of the pin. A pin for spin welding characterized by providing a pin.

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