JPH0429533B2 - - Google Patents

Description

Detailed Description of the Invention [Technical Field] The present invention relates to ultrasonic wave treatment of a second member such as a metal fitting made of a material having a higher melting point than that of the first member in a first member such as plastic made of a thermoplastic resin material. This invention relates to a device for connecting and fixing members using an ultrasonic welder, which is configured to embed a second member such as a metal fitting into a first member such as plastic by press-fitting the second member using an ultrasonic welder.

[Prior art]

Conventionally, in the above-mentioned device for connecting and fixing components using an ultrasonic welder, metal fittings such as bolts and nuts are embedded and fixed in prepared holes prepared in advance in plastic made of thermoplastic material, and the bolts, nuts, etc. When assembling and connecting a plastic member in which a metal fitting is embedded and fixed with another member, in order to prevent the metal fittings such as bolts and nuts from rotating or coming off, as shown in Fig. 1, the bolts, nuts, etc. By using ultrasonic energy to embed metal fittings, etc., in which the outer periphery of the embedded part has been knurled or has many tapered steps formed in advance, the bolts, nuts, etc. was fixed to the plastic member.

However, as mentioned above, when a metal fitting with knurling on the outer periphery is simply embedded in a prepared hole formed in a plastic member, the adhesion between them is weak and it is difficult to assemble with other parts. It is not possible to reliably prevent rotation or slip-off when connecting, etc., and it is not possible to sufficiently prevent rotation even in the case where a large number of tapered steps are formed. However, the knurling process or the process to form a large number of tapered steps is troublesome and increases the cost of the metal fittings.

〔the purpose〕

The present invention has been made in view of the various problems mentioned above, and when a second member such as a metal fitting is embedded and fixed in a first member made of plastic material using ultrasonic waves, the second member is A recess is formed in at least a portion of the machining surface of the machining horn that is brought into contact with the flat surface of the second member, and at least a portion of the end of the flat surface of the second member is positioned below the recess. When the second member is embedded, the first member melted by ultrasonic waves wraps around the flat surface side of the second member, covering the flat end of the second member and solidifying the second member, such as a metal fitting. It is possible to easily and reliably prevent the second member from coming off from the first member, preventing it from rotating, etc. when the second member is fixed to the first member and connected to another member without applying any special processing to the second member. The object of the present invention is to provide a device for connecting and fixing members using an ultrasonic welder.

〔Example〕

EMBODIMENT OF THE INVENTION Hereinafter, the details will be explained based on the drawings showing an example in which the present invention is embodied in an ultrasonic welder.

In FIG. 2, the processing horn 1 has a substantially cylindrical shape, and its upper end is connected to an ultrasonic transducer (not shown), and is mounted on a machine frame (not shown) together with the ultrasonic transducer so as to be movable up and down. It is fixed to a movable frame (not shown) and is arranged to be movable up and down together with the movable frame. A hollow hole 2 along the cylindrical axis is formed in the lower end of the machining horn 1, and an annular machining surface 3 is formed, and the machining surface 3 is configured to be ultrasonically vibrated in the vertical direction. There is. An annular groove 4 is formed on the annular processed surface 3 along a circumferential line having the same central axis as the hollow hole 2 at a position away from the hollow hole. A receiving jig 5 fixed to the machine frame (not shown) is arranged below the machine frame, and the workpiece made of thermoplastic material placed on the receiving jig 5 can be moved up and down. The processing horn 1 is configured so that various ultrasonic processing can be performed by bringing the processing surface 3 of the processing horn 1 into contact with the horn 1 and applying a pressing force by a pressing means such as an air cylinder (not shown).

The ultrasonic welder configured as described above is used to attach a plastic plate W1 made of a thermoplastic resin material as a first member to a metal flat screw W2 as a second member having a higher melting point than the first member.
The operation will be explained below in case of implantation and fixation.

First, as shown in FIG. 2, a plastic plate W1 is placed on the receiving jig 5, and a flat screw W2 is placed at a desired position on the plastic plate W1 so that its slotted part is positioned downward. After this, the machining horn 1 is lowered by pressing a starting switch (not shown), and the machining surface 3 located on the inner peripheral side comes into contact with the flat surface W2a of the flat screw W2. At this time, when the pressing force of the machining horn 1 against the flat screw W2 based on a pressing means such as an air cylinder (not shown) is increased to a predetermined pressure or more, the vibration of the ultrasonic vibrator (not shown) is started, and the machining surface is The plastic plate W located around the flat screw W2 based on the ultrasonic vibration transmitted from 3 to the flat screw W2.
1 is heated and melted, and the flat screw W2 is press-fitted and lowered together with the machining horn 1 based on the pressing force of the pressing means (not shown). As the machining horn 1 and the flat screw W2 are press-fitted and lowered, the molten plastic plate W1 is raised around the flat screw W2, and is finally located on the outer peripheral side of the lower end of the machining horn 1. While coming into contact with the machined surface 3, the melted portion is pushed out along the annular groove formed in the machined surface 3, and as shown in FIG.
The flat side is completely filled.

In this state, the vibration to the ultrasonic vibrator is stopped, and the processing horn 1 is pressed and held until the molten part of the melted plastic plate W1 is cooled and solidified, and then the next welding process is carried out. In preparation for work, the machining horn 1 is raised to the position shown in FIG.

Through the above operations, the flat screw W2 is press-fitted into the plastic plate W1, and the embedding and fixation of both is completed, and the molten part of the plastic plate W1 covers and solidifies both flat sides of the flat screw W2, and the molten part of the plastic plate W1 is solidified. The flat screw W2 is reliably embedded and fixed in the plastic plate W1 by solidifying the molten part after entering the plastic plate W1, and the flat screw W2 can be prevented from rotating and coming off reliably and automatically. .

In the above embodiment, a slotted flat screw is embedded and fixed in a plastic board, but there are various other types of screws, such as round screws, pan head screws, and cross recessed screws, which are commonly available on the market. The present invention can also be carried out using screws such as the one shown in FIG. Further, in the above embodiment, an example was shown in which a metal screw is embedded and fixed in plastic, but if it is made of a material with a higher melting point than plastic, for example,
Plastic screws made of other resin materials may also be used to implement the present invention.
Needless to say, as shown in the figure, a columnar body W3 having an internal thread cut therein may be press-fitted into the plastic member W1 and embedded and fixed therein.

In the above embodiment, an annular groove 4 is provided on the processed surface 3, and the melted plastic plate W is
1 is shown as being configured to be solidified so as to cover the entire circumference of the flat end of the head of the flat screw W2 as the second member, but it does not necessarily cover the entire circumference of the flat end. Needless to say, a recess may be formed in at least a part of the machined surface so that the plastic plate can be melted and solidified by covering at least a portion of its entire circumference.

Further, in the above embodiment, the flat screw W2 is simply placed on the plastic member W1, and then the flat screw is embedded and fixed by ultrasonic press-fitting. A small hole Wa having an outer diameter slightly larger than the flat screw is previously formed on the plastic member W1, and the head of the flat screw W2 is inserted and placed on the small hole Wa.
By fixing a magnet in advance in the hollow hole 2 of the machining horn 1 so that the flat screw W2 is attracted and fixed by the magnet, the positioning work can be easily performed and the positioning work can be easily performed. The structure may be configured such that press-fitting can be performed reliably.

Further, in the above embodiment, an example was shown in which the machining surface 3 of the machining horn 1 was constructed so that the outer circumferential portion and the inner circumferential portion of the annular groove were on the same plane, but this is shown in FIG. By configuring the processed surfaces located on the outer periphery and the processed surfaces located on the inner periphery at different heights to increase the thickness of the molten part of the plastic plate, the thickness of the flat screw can be increased. The retaining force may be increased.

Further, in the above embodiment, the embedding depth based on the press-fitting of the flat screw W2 is such that the flat surface of the flat screw W2 that comes into contact with the machined surface 3 located on the inner periphery of the groove 4 is approximately the same as the upper surface of the plastic plate W1. Although we have shown an example of embedding and fixing both by press-fitting them to the extent that they are located on a flat surface, the depth of embedding of the screws, etc. for embedding may be adjusted depending on the shape of the embedding screws, the presence or absence of pilot holes, etc. It may be selected and adjusted as appropriate.

〔effect〕

As described in detail above, the present invention provides a first and a second member by press-fitting a second member made of a material with a higher melting point than that of the first member into a first member made of a thermoplastic resin material using ultrasonic waves. In an ultrasonic welder configured to connect and fix two members, a recess is formed in the processed surface of the processing horn that contacts the second member, and at least one of the flat surfaces that contact the second member with the processed surface. The first member is positioned below the recess, and the first member that is melted when the second member is press-fitted wraps around the flat surface of the second member and covers at least a portion of the end of the flat surface. It can also be used with various types of screws that are usually commercially available without special processing on the metal fittings etc. as the second member, and the second member made of the screws can be used.
Excellent effects such as being able to easily and reliably prevent the second member from coming off from the first member, preventing rotation, etc. when assembling and connecting with another member after the member is embedded and fixed in the first member. It is something to play.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing various implantable second members used in conventional devices, FIGS. 2 and 3 are both partial sectional views showing the structure and operation of the present device, and FIG. 4 6 to 6 are explanatory diagrams for explaining other embodiments of the present invention. In the figure, 1 is a machining horn, 3 is a machining surface, 4 is a groove, 5 is a receiving jig, W1 is a plastic plate, and W2 is a flat screw.

Claims (1)

[Claims] 1. A second member made of a material having a higher melting point than that of the first member is arranged on a first member made of a thermoplastic resin material and placed on a receiving jig, and The machining surface of the machining horn is brought into contact with the flat surface formed on the second member, and ultrasonic vibration is applied to the machining horn, and a pressing force is applied between the receiving jig and the machining surface of the machining horn. and press fit at least a portion of the second member into the first member which is melted by ultrasonic vibration heat, thereby connecting and fixing the first and second members having different melting points. In the member connecting and fixing device using an ultrasonic welder, a recess is formed in at least a part of the processing surface of the processing horn, and at least a part of the end of the flat end surface of the second member is located below the recess. , and the second member is arranged so that the first member melted during the press-fitting of the second member wraps around the flat surface side of the second member and covers at least a part of the end of the flat surface. A device for connecting and fixing members using an ultrasonic welder, characterized in that: 2. The recess is formed of an annular groove having a substantially semicircular cross-sectional shape, and the first member, which is melted when the second member is press-fitted and wraps around the flat surface thereof, covers approximately the entire circumference of the end of the flat surface. A member connecting and fixing device using an ultrasonic welder according to claim 1, characterized in that the device is configured as follows. 3. The machining horn has a substantially cylindrical shape, and a hollow hole extending in the axial direction is provided in the center thereof from the machining surface side. A device for connecting and fixing members using an ultrasonic welder as described in 2.