JP6851610B2 - Heater tip and joining device and joining method - Google Patents

Description

The present invention relates to a heater tip, a joining device and a joining method used for joining processing of thermal caulking and reflow soldering.

Thermal caulking is often used for joining a resin member and a plate-shaped member of a different material (for example, metal, glass, etc.). In such bonding applications, the thermal caulking method typically forms a large number of bosses (or rivets) and through holes in the same arrangement pattern on the mating or facing surfaces of the resin and dissimilar materials, respectively. Then, both members are overlapped so that each boss penetrates each corresponding through hole, and heating and pressurizing are applied to the boss from above at the same time. Then, the portion protruding above the through hole of the boss is plastically deformed so as to spread thickly, and the resin member is crimped with a plate-shaped member made of a different material.

Conventionally, the heater tip method has been used as one method of heat caulking of resin. The heater tip method is when a current-generating jig or heater tip made of refractory metal such as tungsten or molybdenum is pressed against the boss of the resin member to heat and pressurize it, and the boss is plastically deformed into a predetermined shape. At the same time, the power is turned off to cool and the heater chip is pulled apart. The heater chip type joining device has a simpler device configuration than the infrared type joining device and the ultrasonic type joining device, and is not only for thermal caulking of the resin as described above, but also for soldering reflow. It is often used.

JP-A-2015-51603

Conventional heater tips used for thermal caulking and reflow soldering have a chip structure and function that allows joining to be performed at only one processing point at a time. However, in the joining process of heat caulking or reflow soldering, a large number of processing points (caulked portion, soldered portion, etc.) are usually provided on the member or work to be processed. Therefore, for example, when eight machining points are provided on one work, heating / pressurizing operation by the heater tip (the heater tip is energized to generate heat, pressed against one machining point, and the energization is stopped after a predetermined time. The operation of pulling apart) must be repeated eight times in total at eight machining points, and the problem is that the joining machining tact is low.

The present invention has been made in view of the above-mentioned problems of the prior art, and enables simultaneous joining processing by heat caulking or soldering to a plurality of processing points, and further, heat caulking or soldering. Provided are a heater chip capable of improving processing quality and reliability, a joining device using the same, and a joining method.

The heater chip of the present invention is a heater chip for performing thermal caulking or soldering joining processing to a plurality of processing points, and includes a trowel portion for applying heat and pressure to the plurality of processing points during the joining processing. In order to make a physical and electrical connection with the power supply conductor from the heater power supply, a pair of connection terminal portions that extend symmetrically or asymmetrically from the left and right ends of the iron portion and the iron portion. It has a thermocouple for measuring the temperature, and the iron portion faces the first and second iron heat generating portions extending between the pair of connection terminal portions and the plurality of processing points, respectively. A plurality of iron tip portions provided in the first and second iron heating portions and an intermediate interposition extending between both iron heating portions at the central portion in the longitudinal direction of the first and second iron heating portions. The basic configuration is such that the thermocouple has a portion and is mounted on the intermediate intervening portion.

When the heater chip having the above configuration is energized, the heater power supply (not shown) is routed from one connection terminal to the iron (first and second iron heating units) to the other connection terminal or vice versa. ) Flows. In this way, the current splits in the iron section and flows through the first and second iron heating sections, and a part of the Joule heat generated in both iron heating sections is sent to a plurality of processing points at the same time via the plurality of iron tips. Be supplied. On the other hand, the other part of the Joule heat generated in both iron heating parts gathers in the intermediate interposition part in the center and is transmitted to the thermocouple through this intermediate interposition part, and represents the measured value of the iron temperature from the thermocouple. An electrical signal is obtained. Almost no current flows through the intermediate interposition, only heat flows. With such a configuration and action, the power consumption of the heater chip can be reduced, rapid heat generation (heating) / rapid cooling, and the like can be realized, and the responsiveness or sensitivity of the thermocouple can be improved.

Then, in order to further enhance the action and effect of the above basic configuration, in addition to the above basic configuration,
(a) In the heater tip according to the first aspect of the present invention, the intermediate intervening portion is provided near the back surface of the first and second iron heating portions when viewed from the iron tip portion side, and the first and second iron intervening portions are provided. The iron heating portions are closest to each other near the back surfaces of both iron heating portions, and the separation distance gradually increases toward the plurality of iron tip portions.
(b) In the heater chip according to the second aspect of the present invention, a configuration is adopted in which the first and second iron heat generating portions are combined to have a C-shaped surface shape.
(c) In the heater chip according to the third aspect of the present invention, the cross-sectional areas of the first and second iron heating portions change in the longitudinal direction, are the largest at the central portion, and gradually toward both ends. A smaller configuration is adopted,
(d) In the heater chip according to the fourth aspect of the present invention, the first and second iron heating portions change in size in the vertical direction in the longitudinal direction, are the largest in the central portion, and are directed toward both ends. A structure that gradually becomes smaller is adopted,
(e) In the heater tip according to the fifth aspect of the present invention, the working surface of the first and second iron heat generating portions facing the processing point is flat, and the iron tip portion is the first iron tip portion. And a configuration is adopted in which the second iron heat generating portion protrudes from the working surface.
(f) In the heater chip according to the sixth aspect of the present invention, the connection terminal portion is connected to the terminal portion for being detachably connected to the external conductor, and both ends of the terminal portion and the iron portion are connected. The iron connecting portion has a main connecting portion that extends from the terminal portion toward the iron portion in an arm shape, and the iron connecting portion is branched into two from the main connecting portion to generate heat of the first and second irons. A configuration with a branch connection to connect to the unit is adopted.
(g) In the heater chip according to the seventh aspect of the present invention, the main connection portion has a plate thickness smaller than that of the terminal portion in the plate thickness direction of the terminal portion, and the branch connection portion has a cross-sectional area smaller than that of the main connection portion. The configuration to have is adopted.

The joining device of the present invention supports the heater tip of the present invention and the heater tip, and when the joining process of heat caulking or soldering to a plurality of machining points is performed at the same time, the plurality of iron tips are subjected to the plurality of iron tips. It has a heater head that pressurizes and contacts each processing point, and a heater power supply that supplies a current for resistance generation to the heater tip.

The first joining method of the present invention is a joining method in which heat caulking is performed on a plurality of crimped portions of a resin member by using the joining device of the present invention, and the plurality of crimped portions of the resin member are crimped. A first step of applying the plurality of iron tips of the heater chip to the portions, a second step of controlling the heater head to press the heater chip against the resin member with a predetermined pressing force, and the heater. A third step of controlling the power supply to energize the heater chip and plastically deforming each of the crimped portions by heating and pressurizing from each of the iron portions, and controlling the heater power supply to control the heater chip. A fourth step of stopping the energization of the resin member at a predetermined timing and controlling the heater head after a predetermined time to simultaneously pull the plurality of iron tip portions of the heater chip from the plurality of crimped portions of the resin member. Have.

The second joining method of the present invention is a joining method of soldering a plurality of first metal members and a plurality of second metal members using the joining device of the present invention, and the plurality of first metal members. The first step of stacking the plurality of second metal members corresponding to each of the metal members of one via solder, and the heater chip being controlled to the plurality of second metal members of the heater chip. A second step of applying a predetermined pressing force by applying a plurality of iron tips to each other, and a third step of controlling the heater power supply to energize the heater chip and melting the solder by heating from the iron portion. Then, the heater power supply is controlled to stop the energization of the heater chip at a predetermined timing, and after a predetermined time, the heater head is controlled to press the plurality of iron tips of the heater chip to the plurality of second portions. It has a fourth step of simultaneously pulling away from the metal member.

According to the heater tip of the present invention, it is possible to enable simultaneous joining processing by heat caulking or soldering to a plurality of processing points by the above configuration and operation, and further, heat caulking or soldering. It is also possible to improve the processing quality and reliability of soldering.

Further, according to the joining apparatus or joining method of the present invention, by using the heater insert of the present invention, tact and quality can be improved in the joining process of heat caulking or soldering to a workpiece having a large number of machining points. It can be measured.

It is an exploded perspective view which shows the basic structure of the main part of the heater chip of this invention. It is an exploded perspective view which shows the structure of the comparative example. It is a perspective view which shows the appearance structure of the heater chip in 1st Embodiment of this invention. It is a front view, a side view and a bottom view of the heater chip. It is sectional drawing about the line AA of FIG. It is a partial cross-sectional top view of the line BB of FIG. It is a figure which shows the whole structure of the joining apparatus in the said embodiment. It is a perspective view which shows the state of one Example of the processing which joins the member of a different material to a resin member by thermal caulking using the above-mentioned joining device. It is a partial cross-sectional front view which shows each stage of the said heat caulking joint processing. It is a figure which shows typically the heat flow around a thermocouple in the said heater chip which is energized. It is a perspective view which shows the state immediately after the batch heat caulking process with respect to a set of processing points in the said joining process is completed. It is a perspective view which shows the state when the processing of thermal caulking for all processing points is completed in the said joining processing. It is a perspective view which shows the appearance structure of the heater chip in 2nd Embodiment. It is a top view which shows an example work piece which joins a lead wire to a terminal member by reflow soldering using the joining apparatus in the said embodiment. It is a partial cross-sectional front view which shows each stage of the said reflow soldering.

[Basic configuration and operation of the present invention]

FIG. 1A shows the basic configuration of the main part of the heater chip of the present invention. As shown in the figure, the iron portion 2 of the present invention includes first and second iron heating portions 6 and 8 extending between a pair of connection terminal portions 4L and 4R, and a plurality of processing points (not shown), respectively. Multiple (for example, 4) iron tip portions m ₁ , m ₂ , m ₃ , m _{4 provided} on both iron heating portions 6 and 8 so as to face each other, and the central portion of both iron heating portions 6 and 8 in the longitudinal direction. It has an intermediate intervening portion 5 extending between the heat generating portions 6 and 8 of both irons, and the thermocouple 9 is mounted on the intermediate interposing portion 5. An empty space S is provided between the heat generating portions 6 and 8 of both irons according to the distance between adjacent machining points in the opposite direction (horizontal direction orthogonal to the longitudinal direction).

While the heater chip is energized, the heater power supply (not shown) is in the path of one side connection terminal 4L → iron part 2 (iron heat generating parts 6 and 8) → the other connection terminal 4R or the opposite direction. Current I flows from. Here, assuming that the shapes and sizes of both iron heating portions 6 and 8 are the same, branch currents I / 2 and I / 2 flow through both iron heating portions 6 and 8, respectively. A part of the Joule heat generated in both iron heat generating portions 6 and 8 is simultaneously supplied to a plurality of processing points via the _{iron tip portions m 1} , m ₂ , m ₃ and m _4. On the other hand, the other part of the Joule heat generated in the iron heating portions 6 and 8 is collected in the intermediate intervening portion 5 in the central portion and transmitted to the thermocouple 9 through the intermediate intervening portion 5, and is transmitted from the thermocouple 9 to the thermocouple 9. An electrical signal representing the measured value of the iron temperature is obtained. Almost no current flows through the intermediate interposition portion 5, and only heat flows through the intermediate interposition portion 5.

FIG. 1B shows, as a comparative example, a configuration in which the iron portion 2 is not divided into the iron heating portions 6 and 8 and is used as a single unit. Assuming that the shape and volume of the empty space S are equal to the shape and volume of the iron heating portions 6 and 8, in the configuration of this comparative example, the same current density as that of the present invention is obtained in each portion in the iron portion 2. If this is the case, 1.5 times the current (1.5I) must be supplied from the heater power supply. In this comparative example, it is difficult to realize rapid heat generation (heating) / rapid cooling because the power consumption is large and the volume of the iron portion 2 is large, and the induced magnetic field applied to the surroundings by the heater chip that is energized. There are problems such as being large. Furthermore, the heat flow between the thermocouple _{9 and the iron tip portions m 1} , m ₂ , m ₃ , and m ₄ due to the influence of the heat flowing from the intermediate portion (7) that fills the empty space S to the thermocouple 9. The responsiveness or sensitivity of the thermocouple 9 is not good because the sensitivity of the thermocouple 9 is relatively weakened. According to the present invention, the problem of such a comparative example is successfully solved.

[Preferable Embodiment of the present invention]

Hereinafter, preferred embodiments of the present invention will be described with reference to FIGS. 2 to 10.

2, FIG. 3 and FIGS. 4A and 4B show the configuration of the heater chip according to the first embodiment of the present invention. FIG. 2 is a perspective view showing an external configuration of the heater chip. FIG. 3 is a front view, a right side view, and a bottom view of the heater tip. 4A and 4B are cross-sectional views taken along the lines AA and BB of FIG.

The heater tip 10 in this embodiment is made of, for example, a hard plate-shaped refractory metal having a thickness of about 4 mm, for example, rolled tungsten or sintered tungsten, and is substantially concave in front view as shown by wire electric discharge machining, for example. It is manufactured as a single piece (monosilic body).

The heater tip 10 has a horizontally long iron portion 12 located at the lowermost end in a posture of a normal use mode, and a pair of left and right iron portions that are symmetrically (or asymmetrically) extended upward from the left and right end portions of the upper portion integrally with the iron portion 12. It has connection terminal portions 14L and 14R.

The iron portion 12 is formed by the actions of the rod-shaped or plate-shaped first and second iron heating portions 16 and 18 extending straight in parallel between the pair of left and right connection terminal portions 14L and 14R, and the iron heating portions 16 and 18. _{Multiple, for example, four iron tip portions M 1} , M ₂ , M ₃ , M ₄ provided on the left and right ends of the surfaces (lower surfaces) 16a and 18a, and the longitudinal direction (left-right direction) of both iron heating portions 16 and 18. ) Has an intermediate intervening portion 20 extending between the heat generating portions 16 and 18 of both irons. A thermocouple 24 is mounted on the intermediate interposition portion 20 via a protrusion 22.

In the vertical direction, the heat generating portions 16 and 18 of both irons are in close contact with each other in the vicinity of their back surfaces (upper surface) 16b and 18b via the intermediate intervening portion 20, and the distance between them toward the working surface (lower surface) 16a and 18a. Has a shape that gradually increases, and when viewed from the side, both have a C-shaped cross-sectional shape. Further, in the longitudinal direction (horizontal direction), it has a shape in which the size in the vertical direction is the largest in the central portion and gradually decreases toward both ends (the shape of an isosceles triangle when viewed from the front). The cross-sectional areas of both iron heating portions 16 and 18 are also the largest in the central portion in the longitudinal direction (left-right direction) and become smaller toward both ends. The intermediate intervening portion 20 is locally provided near the top of the isosceles triangle. In this configuration, the volume of the intermediate intervening portion 20 that contributes to the heat transfer from the iron heating portion to the thermocouple 24 can be reduced as much as possible because almost no current flows during energization.

The connection terminal portions 14L and 14R are irons that connect the wide and flat terminal portions 28L and 28R in which the bolt through holes 26L and 26R are formed, and these terminal portions 28L and 28R and both ends of the iron portion 12. It has connecting portions 30L and 30R. These iron connecting portions 30L and 30R have an inverted Y-shaped shape when viewed from the side, and the main connecting portions 32L and 32R extending in parallel from the terminal portions 28L and 28R toward the iron portion 12 in an arm shape. , A pair of branch connection portions 34L / 36L, 34R / that branch from the main connection portions 32L and 32R in the plate thickness direction of the terminal portions 28L and 28R and connect to the first and second iron heating portions 16 and 18. It has 36R.

As shown in FIG. 3, the thickness dimension D ₂₈ of the terminal portions 28L and 28R is substantially the same as the width direction dimension D _{12 of the entire iron portion 12.} In the inverted Y-shaped iron connecting portions 30L and 30R, the thickness dimension (plate thickness) D ₃₂ of the main connecting portions 32L and 32R is much smaller than the _{thickness dimension (plate thickness) D 28} of the terminal portions 28L and 28R. (Approximately 1/3), a tapered portion 29 is formed between the terminal portions 28L and 28R and the main connecting portions 32L and 32R so that the plate thickness gradually decreases downward. _{Further, the thickness dimensions D 34} and D ₃₆ of the branch connection portions 34L / 36L and 34R / 36R _{are further smaller than the thickness dimensions D 32} of the main connection portions 32L and 32R (about 1/2 to 2/3). That is, the cross-sectional area of the branch connection portions 34L / 36L and 34R / 36 is much smaller than the cross-sectional area of the main connection portions 32L and 32R.

In this embodiment, the branch connecting portions 34L / 36L and 34R / 36R have substantially the same cross-sectional shape as the central portion in the longitudinal direction of both iron heating portions 16 and 18 (right side view and FIG. 4B), substantially forming a part, that is, both ends of both iron heating portions 16 and 18.

In the iron portion 12, the four iron tip portions M ₁ , M ₂ , M ₃ , and M ₄ are shown in FIGS. 3 (bottom view of the iron portion 12) and FIG. 4A (top view of the iron portion 12). The intermediate intervening portions 20 are provided at both ends (4 locations) of the iron heating portions 16 and 18, which are point-targeted positions with the center position (mounting position of the thermocouple 24) as a reference (center) point. That is, the distance between the mounting position of the thermocouple 24 and the iron tip portions M ₁ , M ₂ , M ₃ , and M ₄ is substantially the same or equal. When the heater tip 10 is energized, it is substantially the same in the four iron section sections between the thermocouple 24 and both ends of the iron heating portions 16 and 18 (iron tips M ₁ , M ₂ , M ₃ , M _4). Alternatively, uniform heat transfer characteristics can be obtained.

The iron tip portions M ₁ , M ₂ , M ₃ , and M ₄ in this embodiment have a rectangular cross-sectional area and a flat tip surface, and are slightly from the working surfaces 16a and 18a of the iron heating portions 16 and 18. Although it protrudes (for example, about 1 mm), such a shape / profile of the iron tip portion is an example, and any cross-sectional shape, protruding shape, tip surface shape, and arrangement form can be adopted. As another embodiment, it is also possible to use the flat working surfaces 16a and 18a of the iron heating portions 16 and 18 as the iron tip portion.

FIG. 5 shows the overall configuration of the joining device 40 in this embodiment. The joining device 40 supports the heater chip 10 having the above-described configuration and the iron tips (M ₁ , M) of a plurality (4) of the heater chips 10 when joining the workpiece. _{A heater head 70 that pressurizes 2} , M ₃ , M ₄ ) to a plurality of (4 points) processing points on the workpiece, a heater power supply 42 that supplies a current for resistance generation to the heater tip 10, and a device. It is provided with a control unit 56 that controls the operation of each unit and the entire operation.

The heater power supply 42 uses an AC waveform inverter type power supply circuit. The inverter 44 in this power supply circuit has four transistor switching elements 46, 48, 50, 52 including a GTR (giant transistor), an IGBT (insulated gate bipolar transistor), and the like.

Of these four switching elements 46 to 52, the switching elements 46 and 50 of the first set (positive side) are set to a predetermined inverter frequency by _{the in-phase drive pulses G 1} and G _{3 from the control unit 56 via the drive circuit 54.} Switching (on / off) control is performed simultaneously at (for example, 4 kHz), and the switching elements 48 and 52 of the second set (negative side) are in phase (drive pulses G ₁ and G _{3) from the control unit 56 via the drive circuit 54.} Is switched and controlled at the same inverter frequency by the drive pulses G ₂ and G _{4 (in opposite phase).}

The input terminals (L ₀ , L ₁ ) of the inverter 44 are connected to the output terminals of the three-phase rectifier circuit 58. The three-phase rectifier circuit 58 is composed of, for example, six diodes connected by a three-phase bridge, and full-wave rectifies the three-phase AC voltage of a commercial frequency input from the three-phase AC power supply terminals (R, S, T) to direct current. Convert to voltage. The DC voltage output from the three-phase rectifier circuit 58 is smoothed by the capacitor 60 and then applied to the input terminals [L ₀ , L ₁ ] of the inverter 44.

The output terminals (N ₀ , N ₁ ) of the inverter 44 are connected to both ends of the primary coil of the welding transformer 62, respectively. Both ends of the secondary coil of the welding transformer 62 are connected to the connection terminals 14L and 14R of the heater tip 10 via the secondary conductors 72L and 72R without passing through the rectifier circuit, respectively.

The control unit 56 includes a microcomputer, and performs all controls in the heater power supply 42, such as energization control (particularly inverter control), setting and display processing of various heat conditions, and is also required for the heater head 70. To control.

In this heater power supply 42, the temperature of the iron portion 12 of the heater chip 10 (more accurately, the iron tip portions M ₁ , M ₂ , M _{3 ,, from the thermocouple 24 attached to the iron portion 12 of the heater chip 10} An electric signal (iron temperature measurement signal) representing (a temperature proportional to the temperature of _{M 4) is given to the control unit 56 via the cable 35.} When performing current feedback control, a current sensor 64 including, for example, a current transformer is attached to the conductor of the primary side circuit. From the output signal of the current sensor 64, the measured value of the primary current or the secondary current (for example, the effective value, the average value or the peak value) is obtained in the current measuring circuit 66, and the current measuring signal is given to the control unit 56.

The joining device 40 can maximize the rapid heat generation / rapid cooling function of the heater chip 10 by the high-speed and fine energization control function of the inverter type heater power supply 42.

[Examples of bonding process of resin heat caulking]

Next, with reference to FIGS. 6 to 9B, an embodiment in which a resin member and a member of a different material, for example, a metal member, are joined by thermal caulking will be described using the joining device 40 having the above configuration.

In FIG. 6, the heater head 70 physically connects the left and right connection terminals 14L and 14R of the heater chip 10 with bolts 74L and 74R on one side surface of a pair of power feeding conductors 72L and 72R leading to the output terminals of the heater power supply 42 (FIG. 5). It is physically and electrically coupled, and has an elevating mechanism that moves the heater tip 10 up and down via the power feeding conductors 72L and 72R, and a pressurizing mechanism (not shown) that presses against the work W. There is. An insulator 76 for electrically separating the two is sandwiched between the power feeding conductors 72L and 72R.

In the work W in this embodiment, the plate-shaped metal member 82 is joined and fixed on the plate-shaped resin member 80 by thermal caulking, and a plurality of work W (for thermal caulking) are formed on the peripheral edge of the metal member 82. a through-hole _H 1 to H ₈ of 8) in the illustrated example is formed, the boss _B 1 to the position (8 places) corresponding respectively to the through-hole _H 1 to H ₈ on the upper surface of the resin member 80 .about.B ₈ is integrally formed. When the metal member 82 is aligned and stacked on the resin member 80, as shown in the figure, the bosses B _{1 to} B ₈ of the resin member 80 penetrate through the through holes H _{1 to} H ₈ of the metal member 82 and protrude. It has become like.

The resin member 80 may be a single plate body as shown in the figure, or may be a part of an assembly (not shown), for example, a lid body. The size of the bosses B _{1 to} B ₈ may be arbitrary, but in the work W of small precision parts mounted on portable electronic devices, the bosses B _{1 to} B ₈ may have a diameter of, for example, 0.3 mm or less. Not unusual. In the heater tip 10, _{the diameters of the iron tips M 1} , M ₂ , M ₃ , and M ₄ are selected to be one size larger (for example, 0.5 mm) than the diameters of the bosses B _{1 to} B _8.

In the thermal caulking of such a small precision component with respect to the work W, fine and highly reproducible performance is required for the heating characteristics or functions given to each processing point (thermal caulking portion) of the heater tip 10. That is, when the heating is insufficient, the boss may be damaged due to insufficient softening, and when the heating is excessive, the boss is likely to melt and cause stringing or burrs. If there is a defect in the thermal caulking process even at one of the plurality of bosses B _{1 to} B _{8 existing on the work W, the entire work W becomes a defective product.}

As described in detail below, the joining device 40 in this embodiment can not only realize a significant improvement in the tact of thermal caulking, but also perform fine, reliable and reproducible thermal caulking at each machining point. It can be applied, and the yield of joining processing can be improved.

In FIG. 6, a predetermined pattern is formed between the arrangement pattern _{of the processing points B 1} / H _{1 to} B ₈ / H ₈ on the work W and the arrangement pattern of the iron tips M _{1 to} M _{4 on the heater tip 10.} There is a correspondence. That is, the four iron tips (M ₁ , M ₂ , M ₃ , M ₄ ) of the heater tip 10 are provided at four processing points (B) at one end (far side) of the work W. _{It has a one-} to-one relationship with 1 / H ₁ , B ₂ / H ₂ , B ₃ / H ₃ , B ₄ / H ₄ ), and is provided at the other end (front side) of the work W. The four machining points B ₅ / H ₅ , B ₆ / H ₆ , B ₇ / H ₇ , and B ₈ / H ₈ are all set to face each other on a one-to-one basis.

The work W is fixed on, for example, an XY table (not shown). As shown in (a) of FIGS. 6 and 7, the machining points (B ₁ / H ₁ , B ₂ / H ₂ , B ₃ / H ₃ , B ₄ / H ₄ ) of the work W are set. The alignment is performed so that the heater tip 10 is located directly below the iron tip portion (M ₁ , M ₂ , M ₃ , M _4).

When the joining device 40 (FIG. 5) is activated after the alignment, the heater head 70 is activated first. In the heater head 70, the heater tip 10 is lowered, and as shown in FIG. 7 (b), the tips of the iron tips M ₁ , M ₂ , M ₃ , and M ₄ are crimped into four workpieces W, that is, bosses. Apply to the tops of B ₁ , B ₂ , B ₃ , and B _{4, respectively.} Next, the heater power supply 42 (FIG. 5) is activated to start energizing the heater tip 10, and the heater head 70 passes a predetermined pressure or load to the _{bosses M 1} , M ₂ , M ₃ , and M _{4 through the heater tip 10.} Add.

When the energization is started, in the heater chip 10, the current I from the heater power supply 42 is generated in the path of the left connection terminal portion 14L → the iron heating portion 16, 18 → the right connection terminal portion 14R or the opposite path. Joule heat is generated in each part where the current I flows (particularly each part in the iron heating parts 16 and 18) in proportion to the square of the effective value of the current I. In this case, since the material of each part of the heater chip 10 is the same and the electrical resistivity is constant, the smaller the cross-sectional area (area orthogonal to the path of the current I) on the path, the more the current is concentrated and the Joule A lot of heat is generated.

In this heater tip 10, _{both ends of the iron heating portions 16 and 18 provided with the iron tip portions M 1} , M ₂ , M ₃ and M ₄ (including the branch connection portions 34L / 36L and 34R / 36). The cross-sectional area in the vicinity is the smallest, and Joule heat is generated most in these parts. As a result, heat is efficiently supplied to the bosses B ₁ , B ₂ , B ₃ , and B ₄ from both ends of the iron heating portions 16 and 18 via the nearest iron tips M ₁ , M ₂ , M ₃ , and M _4. At the same time, heat is collected from all sides at the intermediate interposition portions 20 located at the central portions of the iron heat generating portions 16 and 18, and is absorbed by the thermocouple 24 on the intermediate interposition portions 20.

In this embodiment, the thermocouple 24 is located on the heater chip 10 at the center point of the point object with respect to the _{iron tips M 1} , M ₂ , M ₃ , and M _{4, and is detected by the thermocouple 24.} A uniform and highly accurate correspondence is obtained between the temperature (measurement temperature) and _{the actual temperature (heating temperature) of each iron tip M 1} , M ₂ , M ₃ , and M _4. Moreover, an intermediate intervening portion 20 is provided at the central portion (near the top) in the longitudinal direction of both iron heating portions 16 and 18 having a C-shaped cross-sectional structure, and the thermocouple 24 is mounted on the intermediate interposing portion 20. Therefore, as shown by arrows F ₁ , F ₂ , F ₃ , and F ₄ in FIG. 8, heat from both ends (4 regions) of the iron heating portions 16 and 18 is even and smooth with the shortest heat transfer route. The responsiveness of the thermocouple 24 is very good because it gathers in the thermocouple 24.

In this way, on the work W, the bosses B ₁ , B ₂ , B ₃ , and B ₄ of the resin member 80 simultaneously heat and pressurize from _{the iron tips M 1} , M ₂ , M ₃ , and M _{4 of} the heater chip 10. Upon receiving and softening, as shown in FIG. 7 (c), _{the tip portions of the bosses B 1} , B ₂ , B ₃ and B ₄ are plastically deformed so as to spread thickly on the metal member 82.

The control unit 56 monitors the output signal (iron temperature measurement value) of the thermocouple 24, and when the iron temperature measurement value reaches the set value (at this time, each iron tip unit M ₁ , M ₂ , M ₃ , The temperature of M ₄ (heating temperature) reaches a predetermined value almost uniformly), and the energization of the heater chip 10 is stopped. Then, the resistance heat generation stops at each part of the heater chip 10, and the main parts from both ends of the iron heat generating parts 16 and 18 having a small heat capacity, which had been generating heat at the highest temperature until then, to the relatively low temperature terminal parts 28L and 28R having a large heat capacity. connection portions 32L, 32R to move heat instantaneously trowel portion through which tip portions _{M 1, M 2, M 3} , M 4 is cooled rapidly and uniformly by, and thus the boss _{B 1, B} 2, B _3, the plastic deformation portion of the _{B 4 [B 1], [} B 2], [B 3], [B 4] also rapidly cooled and uniformly.

Due to this rapid and uniform cooling effect, the heater head 70 may pull up the heater tip 10 immediately after the energization of the heater tip 10 is stopped, and as shown in FIG. 7 (d), the bosses B ₁ , B ₂ , and B may be pulled up. _3, the plastic deformation portion of the _{B 4 [B 1], [} B 2], [B 3], [B 4] tip portion _M 1 without causing stringing from _either, M _{2, M} 3, M ₄ can be pulled apart.

In this way, heat caulking can be simultaneously performed on the work W at four processing points as shown in FIG. 9A by one heating / pressurizing operation using the heater tip 10.

In addition, while the iron tip portions M ₁ , M ₂ , M ₃ , and M ₄ of the heater tip 10 are in pressure contact with the crimped portions (bosses) B ₁ , B ₂ , B ₃ , and B _{4, the heater tip 10} It is also possible to completely stop (end) the energization after repeating the energization (on / off) a plurality of times, and in this case as well, the heating operation is once.

After heat caulking for the set of 4 machining points (B ₁ / H ₁ , B ₂ / H ₂ , B ₃ / H ₃ , B ₄ / H ₅ ) as described above, the XY table operates. Then, the other four processing points (B ₅ / H ₅ , B ₆ / H ₆ , B ₇ / H ₇ , B ₈ / H ₈ ) of the work W are the iron tips (M) of the heater tip 10. Alignment is performed so that they are located directly below ₁ , M ₂ , M ₃ , and M _4). Next, a set of four machining points (B ₅ / H ₅ , B ₆ / H ₆ , B ₇ / H ₇ , B ₈ / H ₈ ) is heated and applied once using the heater tip 10. The pressure operation is performed under exactly the same procedures and conditions as above. As a result, as shown in FIG. 9B, the heat caulking process for joining and fixing the metal member 82 on the resin member 80 is completed by the two heater chip heating / pressurizing operations.

As described above, in this embodiment, heat caulking is simultaneously performed at a plurality of (4 points in the above example) processing points by one heating / pressurizing operation using the heater tip 10 for the work W. As a result, the production tact of the heat caulking process can be significantly improved. Further, as described above, the responsiveness and measurement accuracy of the thermocouple 24 attached to the heater tip 10 are also excellent, and rapid heating and rapid cooling heat caulking can be performed on a plurality of processing points, resulting in a small size. It is also possible to improve the reliability and reproducibility of resin thermal caulking for precision parts.

Although the above-described embodiment relates to heat caulking of a resin member, the heater tip 10 and the joining device 40 in this embodiment can also be applied to heat caulking of a member made of another material.

[Other Embodiments or Modifications]

Hereinafter, other embodiments or modifications according to the heater chip of the present invention will be described with reference to FIGS. 10 to 12.

FIG. 10 shows the configuration of the heater tip 10P according to the second embodiment of the present invention. In the heater chip 10P, the iron portion 12 is divided into the first and second iron heating portions 16 and 18 in the same manner as the heater chip 10 in the first embodiment described above, and the iron heating portions 16 and 18 of both iron heating portions 16 and 18. It has an intermediate interposition portion 20 that is sandwiched or extends over the intervening portion 20, and a thermocouple 24 is mounted on the intermediate intervening portion 20.

However, in this embodiment, the plate thicknesses of the connection terminal portions 14L and 14R (terminal portions 28L and 28R, iron connection portions 30L and 30R) are uniform from the upper end to the lower end, and the side surfaces or plates of both iron heating portions 16 and 18. The surface is parallel and flush with the plate surface of the connection terminal portions 14L and 14R. Further, the distance between the heat generating portions 16 and 18 of both irons is uniform in both the left-right direction and the up-down direction. Therefore, the volume of the intermediate intervening portion 20 is larger than that of the first embodiment described above.

Even if the heater tip 10P in the second embodiment is used, it is possible to simultaneously perform heat caulking at a plurality of (for example, four) processing points by one heating / pressurizing operation, and heat caulking processing is performed. Production tact can be significantly improved compared to the conventional technology. In addition, the reliability and reproducibility of thermal caulking can be improved.

However, in terms of the responsiveness of the thermocouple 24 and thus the temperature control function of the heater power supply 42, the heater chip 10 of the first embodiment described above is superior to the heater chip 10P of the second embodiment. It has been confirmed by experiments.

_{In FIGS. 11 and 12, a large number of conducting wires J 1} , J ₂ , ..... are connected to a large number of terminal members (wiring conductors) K ₁ , K on the ceramic substrate 86 by using the bonding device 40 and the heater chip 10 of the above embodiment. _2, illustrating an embodiment of joining by soldering of reflow in ‥‥. Generally, the material of this type of terminal member K is silver or a silver alloy.

In this case, creamy solder or plated solder 88 is previously applied to the surface of the terminal member K. Each conductor _{J i (i = 1,2, ‥‥} ) placing the tip of the top of each corresponding terminal member K _i, tip portions of the heater chip 10 as shown in (a) of FIG. 11 and FIG. 12 Machining points of a set of four on the work W directly under (M ₁ , M ₂ , M ₃ , M _{4 ) For example, (J 1} / K ₁ , J ₂ / K ₂ , J ₃ / K ₃ , J ₄ / After _{aligning so that K 4} ) is located, the heater tip 10 is lowered by the heater head 70 (FIG. 5).

Then, as shown in FIG. 12B, the iron tips M ₁ , M ₂ , M ₃ , and M ₄ of the heater chip 10 are the lead wires J ₁ on the terminal members K ₁ , K ₂ , K ₃ , and K _4. , J ₂ , J ₃ , and J ₄ are brought into contact with each other with an appropriate pressing force. Under this pressurized state, when the heater power supply 42 (FIG. 5) is turned on and the current I is supplied to the heater chip 10, each part of the heater chip 10 (particularly both ends of the iron heating parts 16 and 18 are the most). Heat is generated and heat is supplied to the machining points J ₁ / K ₁ , J ₂ / K ₂ , J ₃ / K ₃ , and J ₄ / K ₄ via the iron tips M ₁ , M ₂ , M ₃ , and M _4. .. As a result, _{the insulating coatings of the wires J 1} , J ₂ , J ₃ , and J ₄ are melted and peeled off by heat, and the solder 88 is quickly melted around the _{wires J 1} , J ₂ , J ₃ , and J _4. As shown in (c) of FIG. 12, the melted solder 80 rises somewhat so as to crawl up along the peripheral surface of the exposed _{conductors of the respective conductors J 1} , J ₂ , J ₃ , and J _4.

The control unit 56 monitors the output signal (iron temperature measurement value) of the thermocouple 24, and sets _{the temperature (heating temperature) of each iron tip portion M 1} , M ₂ , M ₃ , M ₄ on / off control method or feedback. It is controlled by a control method, and the energization of the heater chip 10 is completely stopped at a predetermined timing. Then, after a certain period of time (holding time) has elapsed from the end of energization, the heater head 70 raises the heater chip 10 as shown in (d) of FIG. 12 to process the iron tips M ₁ , M ₂ , M ₃ , and M ₄ . Separate from points J ₁ / K ₁ , J ₂ / K ₂ , J ₃ / K ₃ , and J ₄ / K ₄ , respectively. Then, the solder 88 solidifies, and the processing points J ₁ / K ₁ , J ₂ / K ₂ , J ₃ / K ₃ , and J ₄ / K ₄ are bonded by soldering.

Also in this embodiment, in the heating operation of the heater tip 10, high-speed and uniform temperature rise, stable constant temperature control, and rapid cooling can be performed for _{each of the iron tips M 1} , M ₂ , M ₃ , and M _4. Therefore, the tact and quality of the reflow soldering process can be improved.

As another embodiment or modification, although not shown, in the iron portion 12 of the heater chip 10, the shape or cross-sectional area of the iron heating portions 16 and 18 is arbitrarily changed in the longitudinal direction, and the iron heating portions 16 and 18 A configuration in which a trowel tip portion is provided in the middle portion or a central portion of the above, a configuration in which a third trowel heat generating portion is provided in addition to the first and second trowel heating portions 16 and 18 is also possible.

10 Heater tip 12 Iron part 14L, 14R Terminal connection part 16, 18 Iron heating part 20 Intermediate intervening part 24 Thermocouple 28L, 28R Terminal part 30L, 30R Iron connection part 32L, 32R Main connection part
34L / 36L, 34R / 36R branch connection portion 40 joining apparatus 42 heater power supply 70 the heater head 80 resin member 82 metallic member B ₁ .about.B ₈ bosses H ₁ to H ₈ holes _{J 1,} J _2, ‥‥ conductors K _1, K _2, ‥‥ terminal members

Claims (12)

A heater tip for performing thermal caulking or soldering joining to multiple machining points.
A trowel portion for applying heat and pressure to the plurality of processing points during the joining process,
In order to make a physical and electrical connection with the power supply conductor from the heater power supply, a pair of connection terminal portions that extend symmetrically or asymmetrically from the left and right ends of the iron portion integrally with the iron portion.
It has a thermocouple for measuring the temperature of the iron part,
The iron portions are provided in the first and second iron heat generating portions extending between the pair of connection terminal portions and in the first and second iron heat generating portions so as to face the plurality of processing points, respectively. It has a plurality of iron tip portions and an intermediate intervening portion extending between both iron heating portions at the central portion in the longitudinal direction of the first and second iron heating portions.
The thermocouple is mounted on the intermediate interposition and
The intermediate intervening portion is provided near the back surface of the first and second iron heating portions when viewed from the iron tip portion side.
The first and second iron heating portions are closest to each other in the vicinity of the back surface, and the separation distance gradually increases toward the plurality of iron tip portions.
Heater tip. A heater tip for performing thermal caulking or soldering joining to multiple machining points.
A trowel portion for applying heat and pressure to the plurality of processing points during the joining process,
In order to make a physical and electrical connection with the power supply conductor from the heater power supply, a pair of connection terminal portions that extend symmetrically or asymmetrically from the left and right ends of the iron portion integrally with the iron portion.
It has a thermocouple for measuring the temperature of the iron part,
The iron portions are provided in the first and second iron heat generating portions extending between the pair of connection terminal portions and in the first and second iron heat generating portions so as to face the plurality of processing points, respectively. It has a plurality of iron tip portions and an intermediate intervening portion extending between both iron heating portions at the central portion in the longitudinal direction of the first and second iron heating portions.
The thermocouple is mounted on the intermediate interposition and
The first and second iron heating portions together have a C-shaped vertical cross-sectional shape.
Heater tip. A heater tip for performing thermal caulking or soldering joining to multiple machining points.
A trowel portion for applying heat and pressure to the plurality of processing points during the joining process,
In order to make a physical and electrical connection with the power supply conductor from the heater power supply, a pair of connection terminal portions that extend symmetrically or asymmetrically from the left and right ends of the iron portion integrally with the iron portion.
It has a thermocouple for measuring the temperature of the iron part,
The iron portions are provided in the first and second iron heat generating portions extending between the pair of connection terminal portions and in the first and second iron heat generating portions so as to face the plurality of processing points, respectively. It has a plurality of iron tip portions and an intermediate intervening portion extending between both iron heating portions at the central portion in the longitudinal direction of the first and second iron heating portions.
The thermocouple is mounted on the intermediate interposition and
The cross-sectional area of the first and second iron heating portions changes in the longitudinal direction, is the largest at the central portion, and gradually decreases toward both ends.
Heater tip. A heater tip for performing thermal caulking or soldering joining to multiple machining points.
A trowel portion for applying heat and pressure to the plurality of processing points during the joining process,
In order to make a physical and electrical connection with the power supply conductor from the heater power supply, a pair of connection terminal portions that extend symmetrically or asymmetrically from the left and right ends of the iron portion integrally with the iron portion.
It has a thermocouple for measuring the temperature of the iron part,
The iron portions are provided in the first and second iron heat generating portions extending between the pair of connection terminal portions and in the first and second iron heat generating portions so as to face the plurality of processing points, respectively. It has a plurality of iron tip portions and an intermediate intervening portion extending between both iron heating portions at the central portion in the longitudinal direction of the first and second iron heating portions.
The thermocouple is mounted on the intermediate interposition and
The size of the first and second iron heating portions changes in the longitudinal direction in the longitudinal direction, is the largest in the central portion, and gradually decreases toward both ends.
Heater tip. The first and second iron heating portions, wherein the plurality of iron tips are provided at point-symmetrical positions with the thermocouple mounting position as a center point, according to any one of claims 1 to 4. Heater tip. The heater tip according to any one of claims 1 to 5, wherein the iron tip portions are provided at both ends in the longitudinal direction of the first and second iron heating portions, respectively. A heater tip for performing thermal caulking or soldering joining to multiple machining points.
A trowel portion for applying heat and pressure to the plurality of processing points during the joining process,
In order to make a physical and electrical connection with the power supply conductor from the heater power supply, a pair of connection terminal portions that extend symmetrically or asymmetrically from the left and right ends of the iron portion integrally with the iron portion.
It has a thermocouple for measuring the temperature of the iron part,
The iron portions are provided in the first and second iron heat generating portions extending between the pair of connection terminal portions and in the first and second iron heat generating portions so as to face the plurality of processing points, respectively. It has a plurality of iron tip portions and an intermediate intervening portion extending between both iron heating portions at the central portion in the longitudinal direction of the first and second iron heating portions.
The thermocouple is mounted on the intermediate interposition and
The working surface of the first and second iron heat generating portions facing the processing point is flat.
The iron tip portion protrudes from the working surface of the first and second iron heat generating portions.
Heater tip. A heater tip for performing thermal caulking or soldering joining to multiple machining points.
A trowel portion for applying heat and pressure to the plurality of processing points during the joining process,
In order to make a physical and electrical connection with the power supply conductor from the heater power supply, a pair of connection terminal portions that extend symmetrically or asymmetrically from the left and right ends of the iron portion integrally with the iron portion.
It has a thermocouple for measuring the temperature of the iron part,
The iron portions are provided in the first and second iron heat generating portions extending between the pair of connection terminal portions and in the first and second iron heat generating portions so as to face the plurality of processing points, respectively. It has a plurality of iron tip portions and an intermediate intervening portion extending between both iron heating portions at the central portion in the longitudinal direction of the first and second iron heating portions.
The thermocouple is mounted on the intermediate interposition and
The connection terminal portion has a terminal portion for being detachably connected to an external conductor, and a trowel connection portion for connecting the terminal portion and both ends of the trowel portion.
The iron connecting portion includes a main connecting portion that extends from the terminal portion toward the iron portion in an arm shape, and a branch that branches from the main connecting portion into two and connects to the first and second iron heating portions. Has a connection,
Heater tip. The main connection portion has a plate thickness smaller than that of the terminal portion in the plate thickness direction of the terminal portion.
The branch connection has a smaller cross-sectional area than the main connection.
The heater chip according to claim 8. The heater chip according to any one of claims 1 to 9,
A heater head that supports the heater tip and brings the plurality of iron tips into pressure contact with the plurality of processing points when heat caulking or soldering of the plurality of processing points is simultaneously performed.
A joining device having a heater power supply that supplies a current for heating resistance to the heater chip. A joining method in which heat caulking is performed on a plurality of caulked portions of a resin member by using the joining device according to claim 10.
The first step of applying the plurality of iron tips of the heater tip to the plurality of crimped portions of the resin member, respectively.
A second step of controlling the heater head to press the heater tip against the resin member with a predetermined pressing force, and
A third step of controlling the heater power supply to energize the heater tip and plastically deforming each of the crimped portions by heating and pressurizing from each of the iron portions.
The heater power supply is controlled to stop the energization of the heater chip at a predetermined timing, and after a predetermined time, the heater head is controlled to crimp the plurality of iron tips of the heater chip to the plurality of objects to be crimped on the resin member. A joining method having a fourth step of simultaneously pulling away from the portion. A joining method for soldering a plurality of first metal members and a plurality of second metal members using the joining device according to claim 10.
A first step of stacking the plurality of second metal members corresponding to the plurality of first metal members via solder, and a first step of superimposing the plurality of second metal members.
A second step of controlling the heater head to apply a predetermined pressing force by applying the plurality of iron tips of the heater tip to the plurality of second metal members.
A third step of controlling the heater power supply to energize the heater tip and melting the solder by heating from the iron portion.
The heater power supply is controlled to stop the energization of the heater chip at a predetermined timing, and after a predetermined time, the heater head is controlled so that the plurality of iron tips of the heater chip are respectively subjected to the plurality of second metal members. A joining method comprising a fourth step of simultaneously pulling away from.

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