JP2017047672A - Heat caulking device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat caulking device capable of heating and cooling a caulking target promptly while saving the power.SOLUTION: A heat caulking device includes: a metal chip 3 having a pressing part 3a for pressing a caulking target, a heating rod 3c erected in a center part of the pressing part 3a, and a wall part 3b erected from an outer periphery of the pressing part 3a; a heating means 10c which has a coil wound around the heating rod on an inner side of the wall part 3b of the metal chip 3 and a power source for supplying a high frequency current to the coil, and heats the heating rod 3c with high-frequency induction heating by the coil through supplying the high frequency current to the coil from the power source; a cooling pipe 9 for cooling the heating rod 3c; a cooling fluid supply means 4 for supplying a cooling fluid to the cooling pipe 9; a holder 1 for holding the metal chip 3 and the cooling pipe 9 such that the cooling pipe 9 feeds the cooling fluid toward the heating rod 3c; and a control means 6 for controlling the heating means 10c and the cooling fluid supply means 4.SELECTED DRAWING: Figure 2

Description

  The present disclosure relates to a heat caulking device, and more particularly to a heat caulking device that caulks plastic parts with a metal chip heated by high-frequency induction heating or current heating.

  In general, as a method of fixing a metal plate or the like to a plastic part, a method of caulking a boss is widely performed. In this method, columnar protrusions (hereinafter referred to as “bosses”) of appropriate sizes are provided at predetermined positions on the plastic part side, while the metal plate or plastic plate on the side fixed to the plastic part has Make a hole to insert the boss. Then, after fitting the two together, the boss protruding from the hole is melted and deformed by applying ultrasonic vibration or heat, and crimped.

  Compared with the method using ultrasonic vibration, the method using heat is (1) the finish is clean, (2) there is no influence on the parts due to vibration, and (3) the maintenance is easy because the principle is simple. (4) Since the cost of the apparatus is relatively low with respect to ultrasonic vibration, it is widely used even today. The heater for crimping the boss uses a nichrome plate or a metal with a relatively large electrical resistance, but the heating uses Joule heat generated by passing a large current. doing.

  An example of a conventional heat caulking device is shown in FIG. In the heat caulking device shown in FIG. 22, a metal plate 8 'with a hole is fitted into a boss 7a' which is a columnar protrusion of the plastic part 7 '. The heat caulking device presses the metal tip 30 heated to the softening temperature or more of the plastic part 7 ′ against the tip of the boss 7 a ′ to perform heat caulking.

  As shown in FIG. 22, lead wires 31a and 31b are respectively welded or screwed to the flange portions 30e and 30f of the metal tip 30 serving as a caulking heater and electrically connected thereto. In the cavity 30c of the metal chip 30, a plastic cooling pipe 32 for sending cooling air cooled to room temperature or lower is arranged so that the opening end thereof is positioned in the vicinity of the pressing portion 30a. The metal chip 30, the lead wires 31a and 31b, and the cooling pipe 32 are molded with, for example, an epoxy resin 34 so as to maintain a desired position.

  In addition, in FIG. 23, the external appearance perspective view of the metal chip 30 single item is shown. The metal chip 30 shown in FIG. 23 has a pressing portion 30a having a convex spherical surface, a cylindrical wall portion 30b rises from the periphery of the pressing portion 30a, and a cavity 30c is formed inside. The wall part 30b is divided | segmented into right and left by the slit 30s, and the flange parts 30e and 30f are formed in the upper end of the wall part 30b.

  In FIG. 22, the pressing portion 30a of the metal tip 30 is drawn at a position above the boss 7a '. When the heat caulking operation is performed, current flows from the lead wires 31a and 31b to the metal chip 30, and the metal chip 30 is heated by Joule heat. When the metal tip 30 reaches a predetermined temperature, the metal tip 30 is lowered as indicated by the Y arrow to bring the pressing portion 30a into contact with the tip of the boss 7a '. Then, the tip of the boss 7 a ′ is softened and melted by the heat of the metal tip 30. Thereafter, energization of the lead wires 31a and 31b is stopped, and cooling air is blown from the cooling pipe 32 to the pressing portion 30a of the metal chip. The cooling air flows out from the slit 30s. Then, the tips of the metal tip 30 and the boss 7a 'are cooled to a temperature below the softening point of the plastic, and the tip of the boss 7a' is solidified. And the metal chip | tip 30 is raised again and the crimping operation | work is completed.

  24A and 24B are cross-sectional views showing the situation at the start of thermal caulking work and the situation at the end of thermal caulking. FIG. 24A shows a stage in which the lead wires 31a to 31b are energized to heat the metal tip 30 and press the pressing portion 30a against the tip of the boss 7a 'to melt and deform it. Specifically, in FIG. 24A, power is supplied from a power supply unit (not shown) to the lead wire 31a, and the flange portion 30e, the wall portion 30b, the pressing portion 30a, the wall portion 30b, the flange portion 30f of the metal chip 30 are supplied from the lead wire 31a, A current flows to the lead wire 31b. As a result, heat is generated in the order of the flange portion 30e, the wall portion 30b, the pressing portion 30a, the wall portion 30b, and the flange portion 30f along the current flow. Then, when the pressing portion 30a reaches a temperature exceeding the softening point of the plastic, deformation of the tip of the boss 7a ', that is, caulking work starts. And the front-end | tip of boss | hub 7a 'is pressed by the press part 30a, and becomes a predetermined shape.

  FIG. 24B shows that after the tip of the boss 7a ′ is melted and deformed, the energization from the lead wires 31a to 31b is stopped, and cooling air is sent from the cooling air blowing means (not shown) through the cooling pipe 32 into the cavity 30c. This shows a situation where the metal tip 30 and the molten boss 7a ′ are discharged from the slit 30s and cooled by being sprayed on the pressing portion 30a. The flow of cooling air in the cavity 30c of the metal tip 30 is indicated by arrows in FIG. 24B. The cooling air hits the pressing portion 30a in the cavity 30c, rises along the wall portion 30b, and exits from the slit 30s to the outside of the metal chip 30. That is, the heat of the metal tip 30 and the molten boss 7a 'is exhausted from the slit 30s. As a result, the boss 7a 'of the plastic part 7', which is a molded product, is melted, deformed, cooled and solidified, and the metal plate 8 'with holes is fixed to the plastic part 7' (see, for example, Patent Document 1).

  FIG. 25 is a schematic cross-sectional view of another conventional heat caulking apparatus for plastic parts in which the metal chip heating means is a high frequency induction heating means. In the heat caulking apparatus shown in FIG. 25, a plurality of metal tips 40 each having a cooling fluid circulation cavity 60 formed under a cooling pipe 70 are attached, and an induction heating coil 51 is wound around the outer periphery of each metal tip 40. It is disguised. The high frequency induction power supply 50 causes a high frequency current to flow through the coil 51 and causes the metal chip 40 to generate an induced current, thereby heating the metal chip 40. Then, the pressing portion 45 of the heated metal tip 40 is pressed against the tip of the boss 7a 'to melt and deform the tip of the boss 7a'. After melting and deforming the tip of the boss 7a ′, the coil 51 is turned off, and a cooling fluid such as cooling air is blown from the cooling pipe 70 toward the pressing portion 45 in the cavity 60 of the metal chip 40. Then, the metal tip 40 and the heated / molten boss 7a 'are cooled. As a result, the boss 7a 'of the plastic part 7', which is a molded product, is melted, deformed, cooled and solidified, and the metal plate with holes (fixed object) 8 'is fixed to the plastic part 7'. Since the high frequency induction heating can instantaneously heat the metal tip 40, there is an advantage that the time required for the caulking process is shortened compared to the energization heating (for example, see Patent Document 2).

  By the way, heat caulking of plastic parts can be applied to heat caulking of smaller plastic parts in addition to bosses and caulking of shaft parts having a diameter of about several millimeters, such as heat caulking against the rotating shaft of daily plastic scissors. Used. For example, in the forceps-type electric processing device shown in FIG. 26, the first forceps piece 12b and the second forceps piece 14b are incorporated into a support 67 attached to the distal end of a catheter tube 47 that can be inserted into the body. The forceps piece 12b and the second forceps piece 14b are supported by a support shaft 80 made of plastic. The support shaft 80 is crimped by heat after passing through the support tool 67, the first forceps piece 12b, and the second forceps piece 14b, whereby the first forceps piece 12b and the second forceps piece 14b are assembled to be freely opened and closed. (For example, see Patent Document 3).

  FIG. 27 schematically shows a process of pressing the heated rod-shaped metal tip 110 against both ends of the support shaft 80 of the support 67 attached to the distal end of the catheter tube 47 for heat caulking. The catheter tube 47 is inserted into a body such as a blood vessel, and the support 67 and the support shaft 80 attached to the tip of the catheter tube 47 are small parts. During the operation, the first forceps piece 12b and the second forceps piece 14b at the distal end of the catheter tube 47 inserted into the body need to be opened and closed as intended by the practitioner (doctor). It is not preferable that the first forceps piece 12b and the second forceps piece 14b move badly because the caulking is tight, or the first forceps piece 12b and the second forceps piece 14b come off because the caulking is sweet.

  As for the caulking of the plastic parts related to the catheter, in addition to the above, the caulking of the stent that is attached to the distal end of the balloon catheter and put into the body, the caulking of the plastic part at the distal end of the endoscope, and the like are known.

  FIG. 28A shows the stent 17 attached to the tip of the balloon catheter and extended into the body. FIG. 28B shows a state in which the stent 17 shown in FIG. 28A is ring-shaped and covered with the caulking ring 18. FIG. 28C schematically shows a process of caulking the caulking ring 18 shown in FIG. 28B from above and below with a pair of heated metal tips 120 (see, for example, Patent Document 4).

  In FIG. 29, an endoscope mounting tool is described in which the fixing member 41 is fixed inside the tube 37 by press-fitting and heat caulking at the distal end portion of the endoscope (see, for example, Patent Document 5). .

  For such heat-caulking of plastic parts, especially plastics for medical use, the heat-caulking device itself strictly controls the heating / pressing conditions of the metal tip, and performs heat caulking under the best heating / pressing conditions required. It is required to perform stably and accurately.

JP 2005-1268 A JP-A-57-195616 JP 2004-229976 A International Publication No. 2009-050888 Japanese Patent Laid-Open No. 11-56753

  In the conventional example of energization heating shown in FIG. 22, (1) since the electric resistance of the heater (metal chip 30) is small (0.05 to 0.1Ω), a thick electric wire for flowing a large current of 20A to 50A is used. I need. In addition, since a transformer for large current is required, the power supply becomes large. (2) Although it is possible to increase the resistance value by thinning the heater material, the thickness of the metal tip is limited to 0.2 mm to 0.5 mm because the mechanical strength is insufficient. (3) Heating of the heater is possible only at the central part where the boss first contacts, but with the structure as shown in FIG. 22, it is heated up to an unnecessary part. It takes time to heat and cools after caulking work. (4) In the case of the conventional example of FIG. 22, it is impossible to replace only the metal tip 30 when the metal tip 30 and the lead wires 31a and 31b, which are heaters, are damaged. (5) Current flows from the lead wire 31a to the lead wire 31b, and the metal tip 30 generates heat along the direction of current flow. Further, since the metal chip 30 is provided with the slit 30s for exhaust heat, a temperature difference can be made with the slit 30s as a boundary. Then, due to the temperature difference of the pressing part 30a of the metal tip, heating / melting of the boss 7a 'becomes non-uniform, and the caulking force becomes non-uniform, which is not preferable. When the center of the boss 7a 'is cooled and solidified before the periphery, an increase in caulking force when the center of the boss 7a' is solidified cannot be expected.

  Further, in the conventional caulking device for plastic parts using high frequency induction heating of FIG. 25, (1) the metal chip 40 is thick and the metal chip 40 has a large heat capacity. Even if the thickness of the metal chip 40 is reduced to reduce the heat capacity, the coil 51 is wound around the outside of the metal chip 40, so that the coil 51 has a large diameter and a high-power induction heating power source with high output. Cost. Moreover, heating time is also required. (2) When the diameter of the boss increases, the outer diameter of the metal tip 40 needs to be increased. As a result, the outer diameter of the coil 51 also increases. If the outer diameter of the metal tip 40 differs according to the outer diameter of the boss, the coil 51 having a size corresponding to the outer shape of the metal tip 40 must be replaced. (3) The space occupied by the coil 51 interferes with the caulking operator, and the space is limited. When replacing the metal tip 40, there is a drawback that the coil 51 becomes an obstacle.

  In addition, in the heat caulking apparatus such as a plastic part having a small catheter-related or endoscope distal end portion described with reference to FIGS. 26 to 29, the heat capacity of the metal tip is small, and the compact and light weight can be set with fine heating and pressing conditions. There is a need for a thermal caulking device.

The present invention has been made to solve such problems, and the object of the present invention is to provide a thermal caulking device capable of quickly heating and cooling a caulking object with low power consumption. is there. More specifically, as an embodiment of the present invention,
(1) The thermoplastic resin boss can be sufficiently crimped in a short time with a small output device.
(2) To provide a heat caulking device for plastic parts having good response to heating and cooling.
(3) In particular, the caulking force can be increased by heating and melting the central portion of the boss to the maximum temperature and cooling and solidifying from the periphery of the boss toward the central portion.
(4) Even if the outer diameter of the boss is larger or smaller, by heating from the center of the boss toward the outer periphery, the necessary amount of heat can be given by changing the length of the heating time while maintaining the same metal tip. The same metal tip can be shared by heat caulking of bosses with different diameters.
(5) Only the metal tip can be easily attached and detached.
(6) To provide a compact and lightweight thermal caulking device.
(7) In particular, in the high-frequency induction heating system, a high-frequency induction heating coil is provided inside the metal chip instead of the outside, and the object is to provide a thermal caulking device for plastic parts that does not interfere with the caulking operator.

  In order to achieve the above-described object, a thermal caulking device according to the present invention is a thermal caulking device that caulks a part of a plastic part as an object to be caulked, and includes a pressing portion that presses the caulking object, and the pressing portion. A metal tip having a heating rod standing at the center and further having a wall portion standing from the outer periphery of the pressing portion, and a coil wound around the heating rod inside the wall portion of the metal tip And a power supply for supplying a high-frequency current to the coil, heating means for energizing the high-frequency current from the power supply to the coil and heating the heating rod by high-frequency induction heating by the coil, and the heating rod A cooling pipe for cooling, a cooling fluid supply means for supplying a cooling fluid to the cooling pipe, and the metal tip and the cooling pipe are held so that the cooling pipe sends out the cooling fluid toward the heating rod. A holder, and a control means for controlling the heating means and the cooling fluid supply means. The control means heats the pressing portion from the heating rod by the heating means, and the caulking object by the pressing portion. After the heat caulking, the cooling fluid is supplied from the cooling fluid supply means to the cooling pipe, and the pressing portion is cooled from the heating rod.

According to the present invention using the above means, the heating rod provided upright at the center of the pressing portion of the metal tip is heated and cooled. Therefore, the central part of the pressing part of the metal tip used for heat caulking can be rapidly heated and cooled. Thermal caulking work that is efficient in terms of both time and heat can be performed without unnecessary heating and cooling of unnecessary portions that do not directly contribute to thermal caulking of the metal chip. There is a unique effect that has never been seen before.
According to the present invention, it is possible to quickly heat and cool a caulking object with power saving. The embodiment of the present invention specifically solves the problems listed above. That is, (1) the thermoplastic resin boss can be sufficiently crimped with a low output device. (2) To provide a heat caulking device for plastic parts having good response to heating and cooling. (3) In particular, the caulking force can be increased by heating and melting the central portion of the boss to the maximum temperature and cooling and solidifying from the periphery of the boss toward the central portion. (4) Even if the outer diameter of the boss is larger or smaller, by heating from the center of the boss toward the outer periphery, the necessary amount of heat can be given by changing the length of the heating time while maintaining the same metal tip. The same metal tip can be shared by heat caulking of bosses with different diameters. (5) Only the metal tip can be easily attached and detached. (6) To provide a compact and lightweight thermal caulking device. (7) Particularly, in the high frequency induction heating type, the high frequency induction heating coil is not inside the metal chip but inside, so that it does not disturb the caulking worker. A heat caulking device for plastic parts can be provided.

Further, the advantages of the heat caulking device according to the present invention are as follows: (1) Since heat from the heated metal rod is transmitted only near the contact portion with the boss, the heat efficiency is good. (2) Since the wall portion of the metal tip is not directly heated, the cooling time is short. (3) Since the current flowing through the high frequency induction heating coil is 2A to 5A, a thin electric wire having a cross-sectional area of about 1 mm ² may be used. (4) The power source need only be an electronic circuit and an electronic component that generate a high frequency, and does not require a large transformer, so it is small and lightweight. (5) When the metal tip becomes dirty or damaged, there is an effect that the replacement of the metal tip is easy.

The whole block diagram which shows the thermal crimping apparatus of the plastic component which concerns on 1st embodiment of this invention. The principal part cross section of the crimping part of the thermal crimping apparatus of the plastic component which concerns on 1st embodiment of this invention. Sectional drawing of the metal chip | tip of the heat crimping apparatus of the plastic component which concerns on 1st embodiment of this invention. 1 is an external perspective view of a metal chip of a thermal caulking device for plastic parts according to a first embodiment of the present invention. FIG. 3 is a cross-sectional view taken along line B-B of FIG. The figure which showed the exploded sectional view of the crimping part of the thermal crimping apparatus of the plastic component which concerns on 1st embodiment of this invention with sectional drawing of the metal chip for replacement | exchange. Sectional drawing of the other metal chip for replacement | exchange of the heat crimping apparatus of the plastic component which concerns on 1st embodiment of this invention. Sectional drawing of the other metal chip for replacement | exchange of the heat crimping apparatus of the plastic component which concerns on 1st embodiment of this invention. Sectional drawing of the other metal chip for replacement | exchange of the heat crimping apparatus of the plastic component which concerns on 1st embodiment of this invention. The figure which showed time-dependent transition of the pressing force in a caulking operation | work by the heat caulking apparatus of the plastic component which concerns on 1st embodiment of this invention, a high frequency current, a cooling fluid flow volume, and a metal chip temperature. The figure which showed the state before the crimping operation | work of the modification of the holder of the thermal crimping apparatus of the plastic component which concerns on 1st embodiment of this invention. The figure which showed the state in the crimping operation | work of the modification of the thermal crimping apparatus of the plastic component which concerns on 1st embodiment of this invention. The whole block diagram which shows the thermal crimping apparatus of the plastic component which concerns on 2nd embodiment of this invention. The control block diagram of the thermal crimping apparatus of the plastic component which concerns on 2nd embodiment of this invention. The figure which illustrated the detail of the thermal crimping conditions memorize | stored in the memory of the thermal crimping apparatus of the plastic component which concerns on 2nd embodiment of this invention. The principal part cross section of the crimping part of the thermal crimping apparatus of the plastic component which concerns on 3rd embodiment of this invention. Sectional drawing which showed the principal part and crimping target object of the crimping part of the thermal crimping apparatus of the plastic component which concern on 4th embodiment of this invention. Sectional drawing which shows the modification of the metal chip | tip of the heat crimping apparatus of the plastic component which concerns on 4th embodiment of this invention. Sectional drawing which showed the principal part of the crimping | crimping part of the thermal crimping apparatus of the plastic component which concerns on 5th embodiment of this invention, and the crimping | crimping object side by side. Sectional drawing which showed the principal part of the crimping | crimping part of the thermal crimping apparatus of the plastic component which concerns on 5th embodiment of this invention, and the crimping | crimping object side by side. The external appearance perspective view of the metal chip of the thermal crimping apparatus of the plastic component which concerns on 5th embodiment of this invention. Sectional drawing which showed the principal part of the crimping | crimped part of the thermal crimping apparatus of the plastic component which concerns on 6th embodiment of this invention, and the crimping | crimped object side by side. The figure which showed the exploded sectional view of the crimping | crimped part of the thermal crimping apparatus of the plastic component which concerns on 6th embodiment of this invention with sectional drawing of the metal chip for replacement | exchange. Sectional drawing which connected the lead wire to the metal chip | tip of the thermal crimping apparatus of the plastic component which concerns on 6th embodiment of this invention. The external appearance perspective view which connected the lead wire to the metal chip | tip of the heat crimping apparatus of the plastic component which concerns on 6th embodiment of this invention. The top view of the metal chip | tip of the heat crimping apparatus of the plastic component which concerns on 6th embodiment of this invention. Sectional drawing which showed the principal part of the crimping part of the thermal crimping apparatus of the plastic component which concerns on 7th embodiment of this invention, and the crimping target object side by side. The exploded sectional view of the caulking part of the heat caulking device of the plastic parts concerning a seventh embodiment of the present invention. Sectional drawing which showed the principal part and crimping target object of the crimping | crimped part of the heat crimping apparatus of the 1st conventional plastic part. The external appearance perspective view of the metal chip of the heat crimping apparatus of the conventional 1st plastic component. The principal part sectional drawing which shows the state at the time of the heat caulking start of the heat caulking apparatus of the conventional 1st plastic component. The principal part sectional drawing which shows the state at the time of complete | finishing the heat crimping of the heat crimping apparatus of the conventional 1st plastic component, and exhausting heat. The schematic block diagram of the heat crimping apparatus of the conventional 2nd plastic component. The perspective view of the catheter tube with an opening-and-closing forceps component which is the plastic component by which conventional heat crimping is carried out. The figure which showed the state when carrying out the heat crimping of the support axis | shaft of the catheter tube with an opening / closing forceps component which is the conventional plastic component to be heat crimped. The figure which showed the state before the crimping of the stent which is the conventional plastic component crimped by heat. The figure which showed the preparation state before the crimping of the stent which is the conventional plastic component to be crimped by heat. The figure which showed the state just before starting the crimping of the heat of the crimping process of the stent which is the conventional plastic component to be crimped by heat. The figure which showed the state when the plastic part of the front-end | tip part of the conventional endoscope was crimped by heat.

(First embodiment)
FIG. 1 is an overall configuration diagram showing a plastic part thermal caulking device according to a first embodiment of the present invention. As shown in FIG. 1, in the heat caulking device, a holder cap 2 is provided at the tip of a holder 1 having a hollow bar shape, and a metal chip 3 is held by the holder 1 and the holder cap 2. The holder 1 and the holder cap 2 are made of an insulating material such as plastic, and are held by a worker's hand or held by pressing means of a robot or other production machine. The heat caulking device presses the pressed portion of the heated metal chip 3 against the boss 7a of the plastic part 7, and heats the other metal plate 8 and the like that are stacked on the plastic part 7 and penetrated by the boss 7a. Caulking operation is possible.

  In FIG. 1, a cooling pipe 9, which will be described in detail later, is arranged inside the holder 1, and has a cooling function for forcibly cooling the metal chip 3 after heat caulking. Therefore, the inside of the holder 1 is a cavity 1a. A hole 1b is formed in the side surface of the holder 1, and the hole 1b communicates with the inside of the hose 4a having one end connected to the side surface of the holder 1. The other end of the hose 4 a is connected to the cooling fluid supply machine 4. Further, another hole 1d is formed on the side surface of the holder 1, and a pair of lead wires 10a and 10b are bundled into the hole 1d and passed as one bundled lead wire 10. The lead wires 10a and 10b are connected to the heating power source 5 through the hole 1d on the side surface of the holder 1. The cooling fluid supply unit 4 and the heating power source 5 are assembled together and form a control unit together with the control unit 6. As will be described in detail later, the control unit 6 stores a control circuit for controlling the heat caulking work and various control conditions, and a memory for storing the optimum heat caulking conditions according to a predetermined heat caulking work. In addition, a thermal caulking condition storage / reading unit for storing and reading the thermal caulking conditions in the memory is provided so that the thermal caulking work can be performed.

  FIG. 2 shows the metal chip 3 of the plastic part thermal caulking device according to the first embodiment of the present invention, and the holder 1 and the holder cap 2 that support the metal chip 3 (hereinafter referred to as “thermal caulking device”). 2 is a cross-sectional view of a main portion of the squeezed portion. The metal chip 3 is at the bottom of FIG. 3A is a cross-sectional view of the metal tip 3, and FIG. 3B is an external perspective view of the metal tip 3. As shown in FIG.

  In order to understand the invention, the metal tip 3 will be described first. The metal chip 3 has a cylindrical shape with a bottom as a whole, and the bottom portion functions as a plate-like pressing portion 3a that presses a boss 7a of a plastic part. The plate-like pressing portion 3a has a spherical surface convex upward (on the holder 1 side). A rod-shaped heating rod 3c is erected at the center of the pressing portion 3a by, for example, welding or brazing. A plate-like wall portion 3b rises upward from the outer periphery of the pressing portion 3a, and the wall portion 3b is divided into two regions by a pair of slits 3s in the circumferential direction. Plate-shaped flanges 3e and 3f are formed at the upper end of the wall 3b. The material of the heating rod 3c is preferably a ferromagnetic material such as an iron-based alloy or a nickel-based alloy. This is because when the heating rod 3c is a ferromagnetic material, the Curie temperature can be easily adjusted, as will be described in detail later.

  FIG. 4 is a cross-sectional view taken along line BB in FIG. 2, and shows the positional relationship between the cooling pipe 9, the lead wires 10 a and 10 b in the metal chip 3, and the sealing material 11. As shown in FIG. 4, the sealing material 11 is provided on the bottom surface inside the holder 1. The gap between the outer periphery of the cooling pipe 9 and the lead wires 10a and 10b is filled with a sealing material 11 such as silicon rubber or high density sponge, so that the cooling fluid sent from the cooling pipe 9 is And the lead wires 10a and 10b are not ejected from the gap.

  Referring to FIG. 2, a screw 1 g is cut on the outer periphery of the lower end portion of the holder 1, and a step portion 1 f that fits with the inner wall of the metal chip 3 is formed on the lower end surface. Further, a deformation hole 1c is formed from the center position of the lower end surface of the holder 1 to the inner bottom surface, and the cooling pipe 9 and the lead wires 10a and 10b pass through the deformation hole 1c. The shape of the deformed hole 1c is a shape in which a small-diameter hole through which the lead wires 10a and 10b pass is formed on both sides of the large-diameter hole through which the cooling pipe 9 passes, as viewed in the BB cross section as shown in FIG. It is.

  The lead wires 10a and 10b are originally one lead wire, and are continuously wound around the lower outer periphery in the longitudinal direction of the cooling pipe 9 in advance, and then the respective ends of the lead wires 10a and 10b along the cooling pipe 9 are deformed holes 1c. It is pulled up to the inside of the holder 1 through. The lead wire continuously wound around the lower outer periphery of the cooling pipe 9 becomes the high frequency induction coil 10c. When a high frequency current is passed through the lead wires 10a and 10b, the induction current flows through the high frequency induction coil 10c. The heating rod 3c in the high frequency induction coil 10c generates heat to a high temperature by induction heating.

  The inner surface of the wall portion 3b of the metal tip is fitted to the outer peripheral surface of the step portion 1f of the holder 1, and the flanges 3e and 3f of the metal tip are in contact with the outer peripheral edge portion of the step portion 1f. With the metal chip 3 fitted in the step portion 1 f of the holder 1, the holder cap 2, which is also made of plastic and has a female screw cut inside, is screwed. Since the metal tip holding portion 2 a protruding inward is formed at the lower end of the holder cap 2, when the holder cap 2 is tightened against the holder 1, the flanges 3 e and 3 f of the metal tip 3 are attached to the holder 1. The metal tip 3 is held by being sandwiched between the outer peripheral edge of the step portion 1 f and the metal tip holding portion 2 a of the holder cap. When the metal tip 3 is attached to the holder 1 in this way, the heating rod 3c is erected at the center of the pressing portion 3a of the metal tip 3, so that the heating rod 3c is wound around the outer periphery of the cooling pipe 9. It will be located in the coil 10c.

  Hereinafter, an example of a heat caulking method when the boss 7a penetrating the metal plate 8 placed on the plastic component 7 is an object to be caulked by the heat caulking apparatus configured as described above will be described.

  First, a high frequency current is supplied from the heating power supply 5 to the lead wires 10a and 10b under the control of the control unit 6 of the control unit. Then, an induction current flows from the lead wires 10a and 10b to the high frequency induction coil 10c, and the metal tip heating rod 3c generates heat to a high temperature by induction heating. The heat generated by the heating rod 3c is transmitted to the pressing portion 3a of the metal tip. The heat transmitted to the pressing part 3a is transmitted to the wall part 3b, and a part of the heat is radiated from the outer surface of the wall part 3b. However, since heat is supplied to the pressing portion 3a from the heating rod 3c, the pressing portion 3a of the metal tip is always maintained in a state where the temperature at the center of the heating rod 3c is high. Moreover, since the time for which the pressing part 3a is heated uses induction heating, it instantaneously rises to a certain temperature necessary for heat-caulking the plastic part.

  When the amount of heat necessary for heat caulking is generated on the metal chip 3 or in advance, the holder 1 is lowered and the boss 7a is pressed by the pressing portion 3a. The heat of the pressing portion 3a is transmitted to the boss 7a, the boss 7a is melted and softened, and the head of the boss 7a spreads outward along the shape of the pressing portion 3a. A metal plate 8 is sandwiched between the plastic part 7. Thereafter, the control unit 6 stops energization of the high-frequency current to the lead wire 10a, and supplies air at a temperature equal to or lower than normal temperature as cooling air (cooling fluid) from the cooling fluid supply unit 4 to the inside of the holder 1 through the hose 4a. To do. The cooling air supplied into the holder 1 is blown from the cooling pipe 9 toward the heating rod 3c and the pressing portion 3a. Then, the cooling air takes heat from the heating rod 3 c, the pressing portion 3 a, and the high frequency induction coil 10 c and exhausts heat from the slit 3 s that is a heat exhaust hole of the metal tip 3 to the outside of the metal tip 3. As a result, the pressing portion 3a and the heating rod 3c of the metal tip are instantaneously cooled. Therefore, the boss 7a that has been temporarily melted and softened is cooled and solidified, and the heat caulking is completed.

  In the first embodiment of the present invention, the central portion that repeats heat generation and cooling, that is, the heating rod 3 c is inside the metal tip 3 protruding from the holder 1. A cooling pipe 9 protruding from the holder 1 is covered around the heating rod 3 c, and a high frequency induction coil 10 c is disposed on the outer peripheral surface of the cooling pipe 9. During heating, the heating rod 3c generates heat by supplying a high-frequency current to the high-frequency induction coil 10c, and the pressing portion 3a and the wall portion 3b of the metal tip are heated from the heating rod 3c. Further, after the heat caulking, the heating rod 3c is cooled by the cooling air being sent out from the cooling pipe 9 toward the heating rod 3c and the pressing portion 3a, and the pressing portion 3a and the wall portion 3b of the metal chip are cooled. .

  Thus, the heating and cooling responsiveness can be improved by heating and cooling from the heating rod of the metal tip standing from the center of the pressing portion.

  In addition, since the high-frequency induction coil 10c is disposed inside the metal chip 3, the thermal caulking device according to the present embodiment does not interfere with the work of a caulking worker, a robot, or the like. Can be improved.

  Further, since the heating rod 3c, the metal chip pressing portion 3a, the wall portion 3b, and the high frequency induction coil 10c are repeatedly heated and cooled, the temperature of the holder 1 does not rise. Further, the holder 1 and the holder cap 2 have a cooling effect due to the passage of cooling air inside the holder 1 and the inside of the cooling pipe 9, and can be kept at a temperature at which an operator can hold it by hand.

  In the present embodiment, FIG. 2 shows a structure in which the metal chip 3 is attached to the holder 1 by tightening the screw of the holder cap 2. That is, the metal chip 3 fixed to the holder 1 can be easily replaced with another metal chip by removing the screw of the holder cap 2 and removing it from the holder 1.

  The holder 1 and the holder cap 2 can be attached / detached by other methods that can be attached / detached by one touch, other than screw connection in which a male screw and a female screw are provided between the holder 1 and the holder cap 2, respectively. Using a structure in which the pin is protruded, the cam groove engaging with the pin is provided in the holder cap 2, and the pin and cam groove are engaged with each other so that they can be integrated with each other or disassembled. Also good.

  Regarding the replacement of the metal chip, FIG. 5 is an exploded cross-sectional view when the screw of the holder cap 2 of the caulking portion of the plastic part thermal caulking device according to the first embodiment of the present invention is loosened and removed from the holder 1. It was shown with sectional drawing of the other metal tip for replacement | exchange.

  As already described, the caulking portion of the heat caulking device of the present embodiment has a structure in which the flanges 3e and 3f of the metal chip 3 are held between the holder 1 and the holder cap 2 to be screw-coupled. Therefore, as shown in FIG. 5, when the screw of the holder cap 2 is loosened and removed from the holder 1, the metal chip 3 can be removed. Further, in FIG. 5, the metal tip 3 can be replaced with another metal tip as indicated by a double-ended arrow of a chain line or a solid line. For example, heat caulking using a metal tip 23 in which the diameter of the heating rod 3c is large and the base of the heating rod 3c and the pressing portion 3a are connected by a curved surface (corner R), or a metal tip 33 having a short length of the heating rod 3c is used. It can be performed.

  6A to 6C are cross-sectional views of other replacement metal tips of the heat caulking device for plastic parts according to the first embodiment of the present invention. In the metal tip 43 of FIG. 6A, the pressing portion 43a has a curved surface that is convex upward in the range of the diameter D2 of the central portion, the remaining peripheral portion other than this range is a flat surface, and the portion following the wall portion 43b is connected by a curved surface. Is. This metal chip 43 is convenient when the head portion of the boss 7a of the plastic part is made small.

  The metal chip 53 in FIG. 6B is a two-stage metal chip in which the wall 53b has a different diameter. Since the metal tip 53 has a thin tip of the wall portion 53b, the vicinity of the tip of the metal tip 53 is easy to see, and the heat caulking work can be easily positioned.

  The metal chip 63 of FIG. 6C has a pressing portion 63a with the center of the caulking side surface protruding downward and the center of the caulking side surface protruding upward. This metal chip 63 has an effect that it can be caulked in such a manner that the center of the boss 7a is pushed down at the center of the pressing portion 63a.

FIG. 7 shows a time-dependent transition of the pressing force, the high-frequency current, the cooling fluid flow rate, and the metal tip temperature during the caulking operation by the thermal caulking device for plastic parts according to the first embodiment of the present invention. FIG. 7 shows changes with time in pressing force, high-frequency current, cooling fluid flow rate, and metal tip temperature with the horizontal axis as the time axis. In FIG. 7, at time (t ₁ ), the pressing force (F) between the pressing portion 3a of the metal chip and the boss 7a of the plastic part 7 starts to rise to a predetermined pressure (F ₁ ). At the same time, since the high-frequency current (I) starts to flow up to the predetermined current (I ₁ ), heat generation of the metal tip 3 starts and the temperature (T) of the metal tip starts to rise. Thereafter, when the time (t ₂ ) when the temperature of the metal tip reaches the predetermined temperature (T ₁ ), the high-frequency current (I) is stopped, and instead the cooling fluid (Q) is supplied by a fixed amount (Q ₁ ), for a fixed time, Flow until time (t ₃ ). Then, the metal tip is cooled and the temperature is lowered. When the temperature of the metal tip returns to room temperature, the metal tip 3 is lifted away from the boss 7a (time (t ₄ )), assuming that the heat caulking has been completed.

Incidentally, in the temperature control of the present invention, the Curie temperature is automatically adjusted under the control of the control unit 6. In Curie temperature automatic control, when a current is passed through a high frequency coil by a high frequency power source, magnetism is generated around the high frequency coil. Due to this magnetism, an eddy current due to the skin effect flows in the magnetic layer of the heating rod provided on the metal tip, and heat is generated by Joule heat. This heat is transmitted to the pressing portion through a heating rod having high thermal conductivity. In particular, when the magnetic layer of the heating rod is made of a material having a Curie point, when it is heated to a temperature equal to or higher than the Curie point, the magnetism is reduced, and accordingly, the eddy current due to the skin effect is lowered and Joule heat is reduced. When the temperature becomes lower than the Curie point, the magnetism returns to the original and Joule heat rises again. By repeating this, the temperature is maintained at a predetermined temperature. The reason why the metal tip temperature (T) in FIG. 7 is kept constant (T ₁ ) is that Curie temperature automatic adjustment is used.

  In FIG. 7, for comparison, for example, values such as pressing force when using the conventional heat caulking device of FIG. 25 are shown by two-dot chain lines. Even if the same high-frequency induction heating and cooling by a cooling pipe are used, the conventional one has a large heat capacity of the metal tip 40, so that it takes time for the temperature rise and cooling of the metal tip 40, as shown by a two-dot chain line in FIG. It took a lot of time to raise the temperature of the metal tip 40 to a predetermined temperature and return it to room temperature. As can be seen from FIG. 7, according to the present invention, the heat capacity of the metal tip 3 is small, rises to a predetermined temperature in a short time, and returns to room temperature in a shorter time than before.

  In this embodiment, the heating rod 3c is provided at the center of the pressing portion 3a of the metal tip 3, and the heating rod 3c is instantaneously heated and cooled. For this reason, the heat capacity of the heating rod 3c may be set to a size necessary for heat caulking. Therefore, the metal chip 3 can be made thin and small, and the apparatus can be reduced in size and weight. Further, by suppressing the heat capacity of the heating rod 3c to the minimum heat capacity required for heat caulking, the power required for heating can also be suppressed, and a reduction in output and power saving can be realized.

  Further, when the boss 7a is cooled and solidified after being melted, it is cooled and solidified sequentially from the periphery of the boss 7a that has been melted, crushed and spread around the center, and the center of the boss 7a is finally cooled and solidified. When the central portion of the boss 7a is solidified, the boss 7a contracts to increase the caulking force. By making the heating rod 3c at the center of the pressing portion 3a larger in heat capacity than the other portions, the central portion of the boss 7a can be surely cooled last, so that the central portion of the boss 7a can be cooled. The effect of increasing the caulking force by contracting when solidifying is obtained.

  If the heating rod 3c is manufactured in advance, it can be easily processed to reduce the heat capacity. In addition, when a large heat capacity is required, it may be replaced with a metal tip having a thick heating rod.

  In the present embodiment, the slit 3s of the metal chip functions exclusively as an opening hole for discharging the cooling air sent into the metal chip. That is, the slit 3s is a heat exhaust hole that takes heat from the heating rod 3c, the pressing portion 3a, and the high-frequency induction coil 10c through cooling air. In the present embodiment, since the pressing portion 3a is heated from the center via the heating rod, the conventional problem that the temperature of the metal tip becomes non-uniform due to the provision of the slit 3s is eliminated.

  Hereinafter, modified examples of the first embodiment will be described. FIG. 8 shows a modification of the first embodiment. The thermal caulking device according to the first embodiment of the present invention already shown in FIG. 1 is used in such a manner that the operator holds the caulking holder 1 by hand and presses the metal chip pressing portion 3a against the tip of the boss 7a. Is done. In this case, there is a possibility that the pressing force varies depending on the worker because the worker works. Therefore, in the modification of the first embodiment, the holder 1 is pressed via the compression spring 150 so that the pressing force does not vary.

  That is, in the modification of the first embodiment of the present invention, as shown in FIG. 8A, a slide holder 200 that is cylindrical and is slidable in the longitudinal direction of the holder 1 is provided on the outer periphery of the holder 1. . A compression spring 150 is provided on the upper end surface of the holder 1. A slide holder cap 201 for restricting the position of the compression spring 150 is integrally attached to the upper portion of the slide holder 200. A flange 1 e is provided at the lower end of the holder 1, and a slide holder stopper 202 whose position is regulated by the flange 1 e is integrally attached to the lower portion of the slide holder 200.

  FIG. 8A shows a state before caulking work. 8A, the compression spring 150 pushes up the slide holder cap 201 above the holder 1, and the lower end of the slide holder stopper 202 is in contact with the flange 1e of the holder. . That is, in this state, a gap (S) is formed between the flange 1e of the holder and the lower end of the slide holder 200.

  In addition, it is preferable to use a screw coupling for each attachment of the slide holder 200 and the slide holder cap 201, and the slide holder 200 and the slide holder stopper 202. This is because the amount of compression of the compression spring 150 and the gap (S) between the flange 1e of the holder and the lower end of the slide holder 200 can be adjusted by adjusting the amount of screw connection. In addition, when adjustment of the compression amount of the compression spring 150 or the clearance (S) between the flange 1e of the holder and the lower end of the slide holder 200 is not necessary, the compression spring 150 may be adhered or welded.

  Next, as shown in FIG. 8B, when the operator holds the slide holder 200 and pushes it down, the pressing portion 3a of the metal tip hits the tip of the boss 7a. Then, the heat of the metal tip 3 is transmitted to the boss 7a, and heat caulking starts. Subsequently, when a pressing force is applied to the slide holder 200, the slide holder cap 201 compresses the compression spring 150, and the holder 1 is pushed down by the urging force of the compression spring 150. On the other hand, when the slide holder 200 is lowered, the tip 200 a of the slide holder hits the flange 1 e of the holder 1. When the operator hits the flange 1e at the lower end of the holder 1 when the tip 200a of the slide holder 200 hits the flange 1e, the pressing force is the pressing force when the compression spring 150 is compressed by a predetermined amount. keep. Further, the heat caulking work can be performed with a substantially constant pressing force. In this way, in the modification of the first embodiment of the present invention, variations in the pressing force during thermal caulking work by an operator are eliminated.

  In the modification of the first embodiment of the present invention, the slide holder 200, the slide holder cap 201, the slide holder stopper 202, and the compression spring 150 are pressed when the operator grips and uses the thermal caulking device of the present invention. Corresponds to means.

  In addition, about using the modification of a metal chip | tip as shown in 1st embodiment, although it abbreviate | omits in description about 2nd embodiment to 7th embodiment described below, it applies similarly in any embodiment. Is possible.

(Second embodiment)
FIG. 9 is an overall configuration diagram showing a plastic part thermal caulking device according to a second embodiment of the present invention. In the heat caulking device for plastic parts according to the second embodiment of the present invention, the holder 1 to which the metal chip 3 is attached is supported by a pressing operation mechanism such as an air cylinder so as to be movable up and down. The second embodiment is characterized in that the pressing portion 3a of the metal tip 3 is pressed to the tip of the boss 7a by the operation of a pressing operation mechanism such as an air cylinder. Since the pressing operation is not performed manually by the operator but by a machine using a heat caulking device, a predetermined pressing force can be uniformly managed and applied.

  In FIG. 9, the housing 100 of the heat caulking device has an L shape in which a support column 100a extending in the vertical direction of the paper and an anvil 100b extending in the horizontal direction of the paper are integrally connected. An air cylinder bracket 101 is attached to the support column 100a. An air cylinder 99 is attached to the air cylinder bracket 101 with the rod 99a facing downward. A slide unit 102 is attached to the tip of the rod 99a and can be moved up and down along the column 100a.

  The slide unit 102 is provided with a heating power source 97 and a cooling fluid supply unit 98 for supplying power to the holder 1 and the high frequency induction coil. Although not shown, the lead wire in the holder 1 is connected to the heating power source 97 and the cooling pipe 9 is connected to the cooling fluid supply unit 98. The metal chip 3 is sandwiched between the holder 1 and the holder cap 2 and is held with the pressing portion 3a facing downward. In FIG. 9, the control unit 6 is disposed on the right side of the housing 100. Although not shown, the control unit 6 is connected to the heating power source 97 and the cooling fluid supply unit 98 in the support column 100a. On the anvil 100b, a plastic part 7 and a metal plate 8 to be heat caulked are placed. The boss 7 a of the plastic part 7 protrudes from the hole of the metal plate 8. Note that the heating power source 97 and the cooling fluid supply unit 98 may be disposed integrally with the control unit 6 on the side of the control unit 6 instead of the slide unit 102.

  When the operator operates the input / output unit 90 of the control unit 6 to select the heat caulking conditions and starts the heat caulking work, the heating is performed by energization from the heating power source 97 under the control of the control unit 6. The metal chip 3 is pushed down together with the slide unit 102 by an air cylinder 99 as a pressing mechanism as shown by an arrow A in the figure. Then, the pressing portion 3a of the metal chip 3 hits the tip of the boss 7a and heat caulks. After a predetermined time, the energization of the heating power source 97 is stopped, the cooling fluid is sent from the cooling fluid supply unit 98 to the cooling pipe 9, and the heating rod 3c, the pressing unit 3a, and the wall 3b of the metal chip 3 are cooled. Thereafter, the metal chip 3 is moved upward together with the holder 1 by the air cylinder 99, and the heat caulking operation is completed. The operator can replace the plastic part 7 and the metal plate 8 on the anvil 100b with new ones, and perform the heat caulking work in the same procedure.

  FIG. 10 is a control block diagram of the plastic part thermal caulking device according to the second embodiment of the present invention. A dashed-dotted frame in FIG. 10 indicates a range corresponding to the control unit 6 in FIG. 9. Within the control unit 6, there is an overall control unit 91, a thermal caulking condition storage / reading unit 92 connected thereto, and a memory 93 connected thereto. Further, the heating control unit 94, the cooling control unit 95, and the pressing control unit 96 are connected to the overall control unit 91, respectively, and the control unit 94, 95, 96 controls the heat caulking device in cooperation with each other.

  Specifically, the heating power source 97 is controlled by the heating control unit 94, the cooling fluid supply unit 98 is controlled by the cooling control unit 95, and the air cylinder 99 is controlled by the pressing control unit 96. At the time of thermal caulking, the overall control unit 91 receives information on the thermal caulking conditions selected by the operator at the input / output unit 90, and stores necessary information according to the thermal caulking conditions via the thermal caulking condition storage / reading unit 92. 93 is stored or read, and commands are sent to the heating control unit 94, the cooling control unit 95, and the pressing control unit 96.

FIG. 11 shows an example of the data configuration of the heat caulking conditions stored in the memory 93. Condition 1, condition 2, condition 3, condition for the outer diameter (X) of the caulking boss, the caulking amount (Y) of the boss, and the material (Z) of the boss, in which the plurality of thermal caulking conditions are in descending order of evaluation points. 4 and condition 5 are shown. Each heat caulking condition includes parameters such as a pressing portion shape (K), a wall outer diameter (D), a wall thickness (N), a heating rod diameter (d), and a heating rod height (H) as well as evaluation points. ), Pressing force (F), high frequency current (I), cooling fluid flow rate (Q), metal tip temperature (T), pressing / energization start time (t ₁ ), energization end / cooling start time (t ₂ ), cooling The numerical values of the end time (t ₃ ) and the press end time (t ₄ ) (represented by symbols in FIG. 11) are stored in the memory 93 like a list, and the overall control unit 91 According to the conditions selected by the user, the specifications of each item are read out and heat caulking control is performed.

  For example, when the operator inputs the outer diameter (X), the amount of crimping (Y), and the boss material (Z) of the boss to be caulked to the input / output unit 90, the thermal caulking condition is stored in accordance with an instruction from the overall control unit 91. The / reading unit 92 reads out the condition to be executed from the memory 93 and presents it to the operator in descending order of evaluation. When the operator selects the condition by the input / output unit 90 and starts the heat caulking, the overall control unit 91 instructs the heating control unit 94, the cooling control unit 95, and the pressure control unit 96 according to the selected heat caulking condition. Then, the heating power supply 97, the cooling fluid supply unit 98, and the air cylinder 99 are operated to perform the heat caulking operation.

  9 shows an example in which the holder 1 to which the metal chip 3 is attached is attached to the slide unit 102 and is supported so as to be movable up and down by a pressing operation mechanism such as an air cylinder 99. As shown in FIG. The holder 1 to which the slide holder 200, the slide holder cap 201, the slide holder stopper 202, and the compression spring 150 are attached may be attached to the slide unit 102. If it does so, the heat crimping using the spring force when compressing a compression spring can be performed.

  In the present embodiment, a metal tip that is a welded or brazed metal rod serving as a heating rod is used at the center of the pressing portion, a high frequency induction coil is set on the outer periphery of the heating rod, and a high frequency current is applied to cause heat by induction heating. The basic effect is the same as that of the first embodiment.

(Third embodiment)
FIG. 12 shows a cross-sectional view of the main part of the heat caulking portion of the heat caulking device for plastic parts according to the third embodiment of the present invention.

  As shown in FIG. 12, the third embodiment of the present invention is characterized in that lead wires 310a and 310b that are not winding portions of the high-frequency induction coil 310c are placed in a cooling pipe 309. Each time the cooling fluid is supplied to the cooling pipe 309, the portions of the lead wires 310a and 310b that are not winding portions of the high-frequency induction coil 310c are cooled in the cooling pipe 309, so that heat generated in the high-frequency induction coil 310c is scheduled. There is an effect that it is not transmitted to the part that is not.

  In addition, the metal chip 303 is not provided with a slit (opening) for exhaust heat such as a slit, and instead, a heat exhaust hole 301 a is formed in the holder 301. The exhaust heat hole 301 a is a hole having an L-shaped cross section including a vertical hole extending in the axial direction from the tip of the holder 301 and a horizontal hole extending from the vertical hole to the side surface of the holder 1.

  More specifically, a high-frequency induction coil 310c is wound around the outer periphery of the cooling pipe 309 at the lower part of the cooling pipe 309, and holes are formed in two places on the side surface above the high-frequency induction coil 310c. A pair of lead wires 310a and 310b extending from the high-frequency induction coil 310c are inserted into the cooling pipe 309 through holes formed in the cooling pipe 309. Although not shown in detail in the drawing, the gap between the lead wires 310a and 310b and the hole of the cooling pipe 309 is preferably closed with a heat-resistant adhesive or the like.

  The holder 301 has substantially the same outer shape as the holder 1 of the first embodiment, but the vertical hole portion of the exhaust heat hole 301 a communicating with the cavity inside the metal tip 303 is in the axial direction of the cooling pipe 309. ing. An O-ring 312 fills the gap between the cooling pipe 309 and the holder 301 and seals it.

  In the third embodiment of the present invention, the cooling air that is the cooling fluid that flows into the cavity of the metal tip 303 from the cooling pipe 309 flows along the outer surface of the heating rod 303c and collides with the pressing portion 303a, and then the wall portion. It rises along 303b and flows out of the holder 301 through the exhaust heat hole 301a. As a result, the heat of the metal rod heating rod 303c, the pressing portion 303a, and the high frequency induction coil 310c is exhausted. In the present embodiment, since heat is transferred to the holder 301 and the holder cap 302 during exhaust heat, the heat exhaust time is lengthened to return the temperature of the holder 301 and the holder cap 302 to room temperature.

  In the third embodiment, the same effect as that of the first embodiment can be obtained, and the mechanical strength of the metal tip 303 can be increased by not providing a slit for exhaust heat in the wall 303b of the metal tip 303. Can do. Therefore, there is an advantage that even if the boss 7a is strongly pressed by the metal chip 303 having a thinner plate thickness, the metal chip 303 is not deformed.

(Fourth embodiment)
In the fourth embodiment of the present invention, as shown in FIG. 13, a heating rod 403c is provided at the center of the inside of the pressing portion 403a of the metal tip 403, and the heating rod 403c protrudes outside the pressing portion 403a as a heating rod tip 403g. There is a feature in the point made.

  FIG. 13: is sectional drawing which showed the principal part of the thermal crimping part of the thermal crimping apparatus of the plastic component which concerns on 4th embodiment of this invention, and the crimping target object side by side. Below the heat caulking portion in FIG. 13, the distal end portion of the catheter tube placed on the anvil 460 and positioned and fixed by the press fixing member 465 with a hole is shown. One end 480a of a plastic support shaft 480 at the distal end portion of the catheter tube is supported by the convex portion 460a of the anvil 460, and the other end 480b of the support shaft is protruded from the pressing portion 403a of the metal tip 403g. Is facing.

  The heating rod tip 403g projects the heating rod 403c in the pressing direction from the pressing portion 403a, and the heating rod tip 403g has a pressing surface. When the heating rod 403c is induction-heated by the high frequency induction coil 410c, the heat energy generated by the heating rod 403c is transmitted to the heating rod tip 403g protruding from the pressing portion 403a of the metal tip. Then, when the heating rod tip 403g crimps the other end 480b of the support shaft at the distal end of the catheter tube with the best thermal crimping condition read out from the plurality of thermal crimping conditions stored in the thermal crimping condition storage unit in advance. The other end 480b of the small support shaft is heat crimped to the best condition.

  Thus, according to the structure which used the heating rod front-end | tip 403g as the press surface, while being able to acquire the effect similar to 1st embodiment, a press surface can be made small. As a result, the heat caulking of a small plastic part such as a plastic support shaft at the tip of the catheter tube to be inserted into the body can be stably and accurately caulked under the best pre-stored heat caulking conditions. .

  In the case of precision caulking of plastic parts, the boss diameter (boss diameter) may be 1 mm or less. For example, even if the boss diameter is 0.5 mm, there is a case where it is necessary to form a convex round head. In that case, as shown in a modification of the metal tip of the fourth embodiment in FIG. 14, heat crimping is performed with a metal tip having a pressing surface 403i of the heating rod tip 403h having a convex curved surface.

(Fifth embodiment)
In the first to fourth embodiments, the example of heat caulking with one metal chip has been described. However, the heat caulking object is sandwiched between the two metal chips with the two metal chips facing each other. An example of caulking will be described as a fifth embodiment.

  FIG. 15A shows a metal chip 3 of a heat caulking device having the same configuration as that of the first embodiment, in which a tubular heat caulking member 575 is fitted to a rod-shaped stent 570 as described in FIGS. The state before moving 3 like a white arrow and pinching is shown. FIG. 15B shows a state in which a high-frequency current is started to be supplied to the high-frequency induction coil 10c in a state where a tubular heat-caulking member 575 with a rod-shaped stent 570 interposed between the metal chips 3 and 3 is sandwiched. A groove having a U-shaped curved surface is formed on the pressing surface of the metal chips 3 and 3. FIG. 16 is an external perspective view of a metal chip 503 alone in a modification of the fifth embodiment. A groove having a U-shaped curved surface is formed on the pressing surface of the pressing portion 503a of the metal chip 503, and a heating rod 503c is erected on the inner center of the U-shaped curved surface. When the rod-shaped stent 570 is thin and the heat caulking member is small, it is preferable to use a metal tip having a more optimal size and shape instead of the metal tip shown in FIGS. 15A and 15B.

  As shown in FIG. 15B, when a high frequency current is passed through the high frequency induction coil 10c, the heating rods 3c generate heat, and the heat of the heating rods 3c is transmitted to the U-shaped curved pressing portion 3a. 3, the heat crimping member 575 and the stent 570 are heated and crimped.

  By performing heat caulking in this way, the heat caulking device of this embodiment is applied to the heat caulking of the stent shown in FIG. 28 described as a conventional example and the heat caulking of the distal end portion of the endoscope shown in FIG. Thus, there is an effect that heat caulking can be stably and accurately performed under the best heat caulking conditions in which heat caulking of small plastic parts is stored in advance.

(Sixth embodiment)
In the first to fifth embodiments, the example in which the metal chip heating means is the high frequency induction heating means has been described, but the heating means may be an electric heating means. In the sixth embodiment, an example in which the heating means is an energization heating means will be described.

  In the conventional crimping device described with reference to FIG. 22, the lead wires 31a and 31b are electrically connected to the flange portions 30e and 30f of the metal tip 30 by welding or screwing, respectively, and one lead wire 31a is connected to the other lead wire. 31b was energized to generate heat by Joule heat.

  However, in the sixth embodiment, as shown in FIGS. 17, 18, and 19, the main part of the caulking portion and the outer shape of the metal tip are shown in the center of the flange 603 j of the metal tip 603 and the pressing portion 603 a of the metal tip 603. Lead wires 610a, 610b, and 610c are electrically connected to the standing heating rod 603c by welding or screwing, respectively. As can be seen from FIG. 19B in particular, the two lead wires 610a and 610b are connected to the opposed positions of the metal chip flange 603j and the remaining one lead wire 610c is connected to the heating rod 603c. . The current flows from the lead wire 610c connected to the heating rod 603c to the lead wires 610a and 610b connected to the flange 603j.

  The lead wires 610a, 610b, and 610c have a predetermined length as shown in FIG. 17, and one end is connected to the metal chip 603 and the other end is disposed in the cavity of the holder 601. It is made to screw with 613a, 613b. Lead wires 610d and 610e connected to a power source (not shown) are screwed to terminal plates 613a and 613b disposed in the cavity of the holder 601.

  When the heating rod 603c is energized from the power source (not shown) through the one lead wire 610e, the terminal plate 613a, and the lead wire 610c, the heating rod 603c first generates heat. Then, the current flows from the heating rod 603c to the two lead wires 610a and 610b through the pressing portion 603a, the wall portion 603b, and the flange 603j, and then flows to 610d through the terminal plate 613b. Thereby, the center of the pressing part 603a with the heating rod 603c becomes high temperature, and as shown in FIG. 19c, heat diffuses from the center of the pressing part 603a toward the outer periphery.

  As shown in FIGS. 17 and 18, the outer periphery of the portion of the holder 601 where the terminal plates 613 a and 613 b are provided is notched, and a lid 650 is provided so as to close the notched portion. The lid 650 is detachable, and the lead wires 610 a, 610 b, and 610 c can be attached to and detached from the terminal plates 613 a and 613 b disposed in the cavity of the holder 601.

  FIG. 17 is a block diagram showing a heat caulking device for plastic parts according to the sixth embodiment of the present invention. FIG. 17 shows a main part of a heat caulking portion of the heat caulking device, a plastic part 7 in which a boss 7a protrudes, and a metal plate 8 that overlaps the plastic part 7 through a hole in the boss 7a. .

  FIG. 18 is an exploded cross-sectional view of the plastic part heat caulking device according to the sixth embodiment of the present invention when the holder cap 602 is loosened and removed from the holder 601. In the sixth embodiment, the metal chip 603 is held by screwing the holder 601 and the holder cap 602 together. Since the metal chip is not molded with a resin material as in the conventional example, the metal chip can be used by exchanging with another metal chip.

  When replacing the metal chip, in the sixth embodiment of the present invention, the cover 650 of the holder 601 is removed, and the screws fixed to the terminal plates 613a and 613b in the holder 601 are loosened with a screwdriver. It is necessary to remove the lead wires 610a, 610b, and 601c. The lid 650 covering the terminal plates 613a, 613b of the lead wires 610a, 610b, 601c may be removed first from the holder 601, and the lead wires 610a, 610b, 601c on the metal chip side may be removed with a screwdriver. Then, after loosening the screw of the holder cap 602, the lid 650 may be removed first from the holder 601, and the lead wires 610a, 610b, 601c on the metal chip side may be removed with a screwdriver. In any case, the metal tip 603 can be replaced with another metal tip. In FIG. 18, as another metal tip, a cross-sectional view of a metal tip having a large diameter heating rod is shown, and it can be replaced by an arrow.

  19A is a cross-sectional view showing the metal chip 603 to which the lead wires 610a, 610b, and 601c are connected, FIG. 19B is an external perspective view thereof, and FIG. 19C is a plan view of the metal chip 603. In the metal tip 603, a wall portion 603b rises around a pressing portion 603a having a convex spherical surface, and a flange 603j is formed at the upper end of the wall portion 603b. A plurality of opening holes 603k communicating from the cavity to the outside are formed. The perspective view of FIG. 19B shows that four opening holes 603k are formed in the wall portion 603b. One lead wire 610a, 610b is connected to the flange 603j, and the other lead wire 610c is connected to a heating rod 603c erected at the center of the pressing portion 603a.

  The arrow in FIG. 19C indicates an image in which the center where the heating rod 603c of the pressing portion is at a high temperature and heat is diffused from the center toward the outer periphery is indicated by the arrow.

  The metal chip 603 has a cavity through which the cooling fluid flows, an opening hole for discharging the cooling fluid to the outside, and a heating rod 603c at the center of the pressing portion 603a. Although it is the same as the metal tip shown in the embodiment, in the sixth embodiment, power is supplied from the central heating rod 603c and a current flows like a ground around the pressing portion 603a.

  In the above description, an example is shown in which one lead wire 610c is connected to the heating rod 603c, and two lead wires 610a and 610b are connected to the opposite positions of the flange 603j. The reason why the two lead wires 610a and 610b are connected to the opposite positions of the flange 603j is that the current flows radially from one lead wire 610c connected to the heating rod 603c. The number of lead wires connected to positions facing each other may be two or more, and may be three or four if space permits.

  Since the metal chip 603 generates heat when energized, the center of the pressing portion 603a with the heating rod 603c that receives power supply first becomes a high temperature, and the heat diffuses from the center toward the outer periphery. When the boss 7a is pressed by the metal tip 603, it is melted by the heat transmitted from the pressing portion 603a. When cooling air is blown from the cooling pipe 609 toward the heating rod 603c and the pressing portion 603a, the heating rod 603c and the pressing portion 603a are cooled. Then, the heat taken from the heating rod 603c is exhausted out of the metal tip 603 through the opening hole 603k.

  Thus, heating from the center of the pressing part 603a on which the heating rod 603c of the metal tip 603 stands in the sixth embodiment toward the periphery and cooling from the center of the pressing part 603a to the periphery is the first. The same as the fifth to fifth embodiments. Accordingly, in the present embodiment, the boss 7a and the like are rapidly heated and rapidly cooled to perform heat caulking. Since it is the same as the first embodiment to the fifth embodiment that the energization condition and the pressing condition are stored in advance and the optimum condition is read out, the description thereof is omitted here.

  Note that the metal chip 603 is configured to be sandwiched between a holder and a holder cap made of a plastic or wooden insulating material, as in the other embodiments.

(Seventh embodiment)
The plastic part heat caulking device according to the seventh embodiment of the present invention is obtained by replacing the lead wires 610a, 610b, and 610c of the sixth embodiment with sheet metals 740 and 741 having spring properties. That is, in the sixth embodiment, the metal chip 603 previously joined with the lead wires 610a, 610b, and 610c can be replaced. In the seventh embodiment, instead of the lead wires 610a, 610b, and 610c, the spring property The metal plates 740 and 741 having the above are incorporated in the holder 701 so that only the metal tip 703 can be replaced.

  FIG. 20 is a block diagram showing a heat caulking device for plastic parts according to the seventh embodiment of the present invention. FIG. 20 shows a main part of a heat caulking portion of the heat caulking device, a plastic part 7 from which a boss 7a protrudes, and a metal plate 8 that overlaps the plastic part 7 through a hole in the boss 7a. .

  Further, in the seventh embodiment of the present invention, as in the third embodiment already described, a heat exhaust hole 701a is formed in the holder 701 so that heat is exhausted from the heat exhaust hole 701a of the holder 701 together with the cooling fluid. I have to. This increases the mechanical strength of the metal tip without providing openings such as slits in the wall portion 703b of the metal tip. As a result, the tip of the boss 7a may be strongly pressed with the pressing portion 703a of the thin metal chip.

  FIG. 21 is an exploded cross-sectional view of the plastic part heat caulking device according to the seventh embodiment of the present invention when the holder cap 702 of the heat caulking device is loosened and removed from the holder 701. The upper ends 740 b and 741 b of the metal plates 740 and 741 having spring properties are fixed to the terminal plates 713 a and 713 b in the holder 701 with screws. Therefore, when the holder cap 702 is removed from the holder 701 by unscrewing, the metal chip 703 pressed against the metal plates 740 and 741 is separated from the metal plates 740 and 741 and is removed from the holder 701 together with the holder cap 702. In the state shown in FIG. 21, the metal tip 703 can be replaced with another metal tip if necessary.

  According to the seventh embodiment of the present invention, there is no need to connect the lead wires 710a and 710b to the metal chip 703 in advance, and there is a convenience that only the metal chip needs to be replaced.

(Aspect of the present invention)
A first aspect of the present invention is a thermal caulking device that caulks a part of a plastic part as an object to be caulked, and includes a pressing part that presses the caulking object, and a heating rod that is erected from the center of the pressing part. A metal chip having heating means for heating the heating rod, a cooling pipe for cooling the heating rod, a cooling fluid supply means for supplying a cooling fluid to the cooling pipe, and the cooling pipe facing the heating rod. A holder for holding the metal tip and the cooling pipe so as to send out the cooling fluid; and a control means for controlling the heating means and the cooling fluid supply means. The pressing portion is heated from a heating rod, and after the caulking target is caulked by the pressing portion, a cooling fluid is supplied from the cooling fluid supply means to the cooling pipe, and the heating rod The pressure part to cool.

  According to a second aspect of the present invention, in the first aspect, the holder includes the metal tip and the cooling member such that a tip portion of the cooling pipe covers the outer peripheral surface of the heating rod of the metal tip with a gap. The heating means has a coil wound around an outer peripheral surface of a tip portion of the cooling pipe, and a power source that supplies a high-frequency current to the coil, and the control means receives the power from the power source. A high-frequency current is passed through the coil, and the pressing portion is heated from the heating rod by high-frequency induction heating using the coil.

  According to a third aspect of the present invention, in the first aspect, the metal tip has a wall portion erected from an outer periphery of the pressing portion, and one of the heating means is connected to a tip of the heating rod. And the other includes two or more energizing members connected to the tip of the wall portion, and a power source for supplying power to the energizing member, and the control means is configured to transmit the heating rod from the power source through the energizing member. The metal tip is heated from the heating rod by energization heating.

  According to a fourth aspect of the present invention, in the second aspect, the metal tip has a wall portion erected from an outer periphery of the pressing portion.

  According to a fifth aspect of the present invention, in the third or fourth aspect, an opening is formed in the wall portion.

  According to a sixth aspect of the present invention, in the third or fourth aspect, an opening hole that communicates from a cavity formed by the wall portion of the metal tip to the outside of the holder is formed at the tip of the holder. Has been.

  According to a seventh aspect of the present invention, in any one of the first to sixth aspects, a thermal caulking condition including at least a value related to the heating unit and a value related to the flow rate of the cooling fluid is stored. Storage means that reads out one or more thermal caulking conditions stored in the storage means, and controls the cooling fluid supply means and the heating means according to the read thermal caulking conditions.

  According to an eighth aspect of the present invention, in the third or fourth aspect, the metal tip has a flange formed at a tip of the wall portion, and the holder has a tip of the metal tip and a flange of the metal tip. A detachable holder cap is provided for sandwiching the holder.

  According to a ninth aspect of the present invention, in any one of the first to eighth aspects, the pressing portion has a spherical shape in which the pressing surface is concave with respect to the pressing direction.

  According to a tenth aspect of the present invention, in any one of the first to eighth aspects, the pressing portion has a U-shaped groove shape whose pressing surface is concave with respect to the pressing direction.

  According to an eleventh aspect of the present invention, in any one of the first to eighth aspects, the pressing portion uses a heating rod tip protruding from the heating rod in the pressing direction as a pressing surface.

  According to a twelfth aspect of the present invention, in any one of the first to eleventh aspects, the cooling fluid is air, and the cooling fluid supply means is a blower.

  According to a thirteenth aspect of the present invention, in any one of the first to twelfth aspects, a pressing operation means that supports the holder and is movable in a pressing direction is further provided.

  In a fourteenth aspect of the present invention, in any one of the first to thirteenth aspects, the holder is provided with a spring that urges the holder in a pressing direction, and the caulking object is urged by the urging force of the spring. Press.

  The present invention can be widely applied to general caulking devices for plastic parts, and can also be applied to caulking devices for, for example, catheter tubes and other small and precise plastic parts.

DESCRIPTION OF SYMBOLS 1 Holder 2 Holder cap 3 Metal chip 3a Press part 3b Wall part 3c Heating rod 3e, 3f Flange 3s Slit 7 Plastic part 7a Boss of plastic part 8 Metal plate 9 Cooling tube 10, 10a, 10b Lead wire 10c High frequency induction coil

In order to achieve the above-described object, a thermal caulking apparatus according to the present invention is a thermal caulking apparatus that caulks a part of a plastic part as an object to be caulked, and a pressing part that directly presses the caulking object, and the pressing part A metal rod having a solid bar-like heating rod standing upright on the opposite side to the side directly pressing the caulking object , and further having a wall portion standing up from the outer periphery of the pressing portion, A coil wound around the heating rod inside the wall of the metal chip, and a power source for supplying a high-frequency current to the coil. Heating means for heating the heating rod by high-frequency induction heating, cooling pipe for cooling the heating rod, cooling fluid supply means for supplying a cooling fluid to the cooling pipe, and the cooling pipe facing the heating rod Above A holder for holding the metal tip and the cooling pipe and a control means for controlling the heating means and the cooling fluid supply means so as to send out the reject fluid, and the control means is configured to control the heating by the heating means. The pressing portion is heated from the rod, and after the caulking target is caulked by the pressing portion, a cooling fluid is supplied from the cooling fluid supply means to the cooling pipe to cool the pressing portion from the heating rod.

Claims (11)

A heat caulking device that caulks a part of a plastic part for caulking,
A metal tip having a pressing portion for pressing the caulking object, and a heating rod erected at the center of the pressing portion, and further having a wall portion erected from the outer periphery of the pressing portion;
A coil wound around the heating rod inside the wall of the metal tip, and a power source for supplying a high-frequency current to the coil, and applying a high-frequency current from the power source to the coil, Heating means for heating the heating rod by high-frequency induction heating with a coil;
A cooling pipe for cooling the heating rod;
Cooling fluid supply means for supplying a cooling fluid to the cooling pipe;
A holder for holding the metal tip and the cooling pipe so that the cooling pipe sends out the cooling fluid toward the heating rod;
Control means for controlling the heating means and the cooling fluid supply means,
The control means heats the pressing portion from the heating rod by the heating means, and supplies a cooling fluid from the cooling fluid supply means to the cooling pipe after the caulking target is caulked by the pressing portion, A heat caulking device that cools the pressing portion from the heating rod. The holder holds the metal tip and the cooling pipe so that a tip portion of the cooling pipe covers the outer peripheral surface of the heating rod of the metal tip with a gap,
The heating means includes a coil wound around an outer peripheral surface of a tip portion of the cooling pipe, and a power source that supplies a high-frequency current to the coil.
The heat caulking device according to claim 1, wherein the control means causes a high-frequency current to flow from the power source to the coil and heats the pressing portion from the heating rod by high-frequency induction heating by the coil.   The thermal caulking device according to claim 1, wherein an opening is formed in the wall portion.   The thermal caulking device according to claim 1, wherein an opening hole that communicates from a cavity formed by the wall portion of the metal tip to the outside of the holder is formed at a tip portion of the holder. Furthermore, a storage means for storing a heat caulking condition including at least a value related to the heating means and a value related to the flow rate of the cooling fluid is provided,
The control means reads out one or more heat caulking conditions stored in the storage means, and controls the cooling fluid supply means and the heating means according to the read heat caulking conditions. The heat caulking device according to 1.   The thermal crimping apparatus according to claim 1, wherein the pressing portion has a spherical shape with a pressing surface that is concave with respect to the pressing direction.   The thermal crimping apparatus according to claim 1, wherein the pressing portion has a U-shaped groove shape whose pressing surface is concave with respect to the pressing direction.   3. The thermal crimping device according to claim 1, wherein the pressing portion has a heating rod tip protruding from the heating rod in a pressing direction as a pressing surface. 4.   The thermal caulking device according to claim 1, wherein the cooling fluid is air, and the cooling fluid supply means is a blower.   Furthermore, the thermal crimping apparatus in any one of Claim 1 or 2 provided with the press operation means which can support the said holder and can move to a press direction.   The thermal caulking device according to claim 1, wherein the holder is provided with a spring that urges the holder in a pressing direction, and the caulking object is pressed by an urging force of the spring.

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