JP5022309B2 - Welding machine and multilayer printed wiring board manufacturing method - Google Patents

Description

  The present invention relates to a welding machine for welding a member to be welded (for example, a constituent member of an inner layer of a multilayer printed wiring board) at a predetermined location, and a method for manufacturing a multilayer printed wiring board using the welding machine.

Conventionally, an inner-layer plate welding machine is known as a welding machine (for example, refer patent document 1). The inner plate welding machine usually includes a plurality of pairs of upper and lower welding bits for heating and pressurizing the prepreg in a dotted manner. An air cylinder is assembled to the frame of the inner layer welding machine as an actuator for reciprocating at least one of the pair of upper and lower welding bits in the vertical direction. A pair of upper and lower welding bits, that is, a first welding bit (upper bit) or a second welding bit (lower bit) is attached to the tip of the air cylinder via an appropriate attachment member. The welding head in the inner layer welding machine is composed of an air cylinder and first and second welding bits. Such a welding head usually has a heater for heating the welding bit, for example, and the temperature of each welding bit is maintained at, for example, about “280 to 350 ° C.” by the heater.
Japanese Patent No. 3883736

  As described above, the inner-layer plate welding machine presses and heats a predetermined location with a welding bit and bonds the structure (welded member) including, for example, a plurality of double-sided substrates and an adhesive inserted therebetween. A multilayer printed wiring board is produced by melting the material and bonding the double-sided substrates together. When welding the adhesive, the interval between the upper and lower welding bits (the limit interval at which the bits can approach each other) becomes important.

  Specifically, the adhesive material is melted by pressurizing and heating the member to be welded (the above structure made of the double-sided substrate and the adhesive material) with the first welding bit (upper bit) and the second welding bit (lower bit). As a result, the portion in contact with the welding bit is crushed and dented by the pressure of the welding bit (thickness is reduced). Then, in the process where the welded portion is melted, crushed and recessed, the recessed portion of the double-sided substrate is dragged into the recessed portion by the welding bit. For this reason, the relationship between the double-sided substrates adjusted to a predetermined positional relationship in advance may be shifted. If such a shift occurs in the positional relationship between the double-sided boards, a shift also occurs in the positional relationship of the wiring and the like according to the shift, and as a result, the quality as a multilayer printed wiring board may deteriorate. Be concerned.

  In order to prevent or suppress such a problem, that is, for example, to adjust the distance between the first welding bit and the second welding bit so that the first and second welding bits do not crush the multilayer printed wiring board more than necessary. An inner layer welding machine having a position adjusting unit has also been proposed. As such a position adjusting portion, for example, an adjustment screw provided for each welding bit is in contact with each other to regulate the approach of the first welding bit and the second welding bit at a predetermined interval. It has been. Here, the interval between the first and second welding bits (more strictly, the limit interval at which these bits can approach each other) can be adjusted, for example, based on the tightening amount of the adjusting screw.

  However, as described above, when the welding bit is normally heated to about “280 to 350 ° C.” and the heat is transferred to, for example, a component around the welding bit, the component may be deformed by the heat. When the peripheral parts are deformed, the position of the welding bit is also shifted according to the deformation, and there is a concern that the welding portion of the member to be welded is excessively pressurized due to the positional shift. It becomes like this. In fact, in the experiment of the inventor, it was confirmed that the heater mounting part (corresponding to the peripheral part of the first welding bit) was extended by heat, and the first welding bit was shifted by about “0.5 mm” below the initial position. It was done.

  In order to make an adjustment that also takes into account the influence of the thermal deformation of these parts, it is conceivable to operate the adjustment screw of the position adjustment portion while the welding bit is heated. However, such adjustment work (screw operation) is a work at a high temperature part, and workability is poor.

  The present invention has been made in view of such circumstances, and is capable of suppressing or preventing excessive pressurization to a member to be welded during welding even when the member to be welded is welded at a high temperature. It is a main object to provide a manufacturing method of a multilayer printed wiring board using the welding machine and the welding machine.

  In order to solve the above-described problem, a welding machine according to a first aspect of the present invention is a welding machine that welds a welded member at a predetermined location, and is disposed so as to face each other, and the welded member is disposed from both sides. A first welding bit and a second welding bit which are welded by pressurization and heating so as to be sandwiched, and at least one of the first welding bit and the second welding bit includes the first welding bit and the second welding bit. The heater is mounted on the first welding bit by a heater mounting component, and the heater mounting component is provided with a position adjusting member, and the position adjusting member is movable in a direction approaching each other. Regulates the approach of the first welding bit and the second welding bit at a predetermined adjustable interval by contacting a predetermined member arranged on the second welding bit side. Ri, the position adjusting member includes at least one temperature regions, have similar heat distortion characteristics and the first weld bit, characterized in that.

  The position adjusting member may have a size equivalent to that of the first welding bit.

  The position adjustment member is an adjustment screw that can be screwed into a screw hole provided in the heater mounting part and adjust the predetermined interval based on the tightening amount into the screw hole. It is good also as a structure.

  A heater is mounted on the second welding bit by a heater mounting component, and the predetermined member disposed on the second welding bit side is provided on the heater mounting component of the second welding bit, and at least the In the temperature region, it may be configured to have the same thermal deformation characteristics as the second welding bit.

  The predetermined member arranged on the second welding bit side may have a size equivalent to that of the second welding bit.

  The predetermined member disposed on the second welding bit side is a screw that is screwed into a screw hole provided in the heater mounting part of the second welding bit, and is based on the tightening amount in the screw hole. In addition to the position adjusting member, the predetermined interval may be adjustable.

  The temperature range may include at least a welding temperature.

  In the method for producing a multilayer printed wiring board according to the second aspect of the present invention, an interlayer adhesive is inserted between the first step of producing a plurality of inner layer boards and the plurality of inner layer boards, and the first of the present invention. The outermost of the second step of welding the inner layer plate and the interlayer adhesive material at a predetermined location by the welding machine according to the aspect, and the inner layer plate welded to the interlayer adhesive material by the second step And a third step of forming a conductor film via an interlayer insulating material on at least one of the positioned inner layer plates.

  A welding machine capable of suppressing or preventing excessive pressurization to a member to be welded at the time of welding even when welding a member to be welded at a high temperature, and a method for producing a multilayer printed wiring board using the welding machine provide.

  Hereinafter, an embodiment embodying a welding machine and a method for manufacturing a multilayer printed wiring board according to the present invention will be described.

  The welding machine of this embodiment is a so-called inner layer welding machine, and as shown in FIG. 1 ((a) is an initial state, (b) is a welding bit proximity state), a C-shaped rack 100 (the frame of the welding machine). And an air cylinder 101 that functions as an actuator for the welding head unit 10. The welding head unit 10 and the air cylinder 101 are each assembled to the C-shaped rack 100. The welding head unit 10 is disposed so as to face each other, and a pair of upper and lower first welding bits 11a and 11b for heating and pressing an adhesive (for example, a prepreg) of a multilayer printed wiring board in a dotted manner, and these Adjustment members 12a and 12b for individually adjusting the positions (vertical positions) of the welding bits 11a and 11b. The air cylinder 101 reciprocates the first welding bit 11a in the vertical direction (the axial direction of the air cylinder 101) so as to approach or separate from the member to be welded. For example, at the time of welding, the air cylinder 101 shown in FIG. By moving the first welding bit 11a downward from the initial state, the welding bit close state shown in FIG. For convenience of explanation, only one set of welding bits is shown, but the inner layer welding machine includes a plurality of pairs of upper and lower welding bits.

  The welding bits 11a and 11b are arranged on the inner surface of each tip portion of the C-shaped rack 100 so as to face each other via the welding head bases 13a and 13b, respectively. More specifically, as shown in an enlarged view of the welding head 10 in FIGS. 2 to 4 (see particularly FIG. 3), the welding bits 11a and 11b have heaters 102a and 102b for heating the welding bits, respectively. Built-in heater bits 131a and 131b (heater mounting parts) are provided. The heaters 102a and 102b are disposed close to the welding bits 11a and 11b (at positions closer to the welding bits 11a and 11b than the adjustment members 12a and 12b). The heaters 102a and 102b are made of, for example, SUS-304, and are formed in a rod shape by attaching a Siegel wire to the tip of the glass tube. However, it is not limited to such a heater, and any heater can be used. Each welding bit can be heated to, for example, about “280 to 350 ° C.” by the heaters 102a and 102b.

  The first welding bit 11a (upper bit) is laminated in order of the heater bit 131a and three rectangular plates, that is, the heater bit 131a side (lower side), the heat insulating material 132a, the heat radiating member 133a, and the heat insulating material 134a. The air cylinder 101 is connected to the laminated structure. The connecting portion between the first welding bit 11a and the air cylinder 101 is provided with a connecting member 101a (an attachment member for the air cylinder 101) that connects both of them.

  Here, the heat insulating material 132a, the heat radiating member 133a, and the heat insulating material 134a are composed of the heat insulating material 132a and the heat radiating member 133a from the lower side by, for example, a metal bolt 151, and the heat radiating member 133a and the heat insulating material 134a From, for example, the three pieces are joined together by being connected by a metal bolt 152, for example. By sandwiching the heat radiating member 133a in this way, the amount of heat transferred from the heater bit 131a to the coupling member 101a can be reduced by the heat radiating effect, and the temperature of the coupling member 101a can be lowered. The heat radiating member 133a is made of a material having excellent heat radiating properties such as iron or stainless steel. On the other hand, the heat insulating material 132a and the heat insulating material 134a are made of a material having excellent heat insulating properties such as glass fiber.

  The bolt 151 and the bolt 152 are arranged so as not to be directly connected to each other, that is, to be separated from each other by a predetermined distance. Thereby, when the heat generated from the heater bit 131a is transmitted to the coupling member 101a, the heat always passes through the heat radiating member 133a and is radiated.

  A part of the heat insulating material 134 a is cut out to form a through hole 153. Through the through hole 153, the upper surface of the heat dissipation member 133a is exposed. Thereby, the heat dissipation effect is enhanced.

  Furthermore, the coupling member 101a includes a heat dissipation member 154 made of a material having excellent heat dissipation properties, such as iron and stainless steel, not only in the vertical direction (longitudinal direction) but also on the side (short direction). The coupling member 101a and the heat dissipation member 154 are fastened by, for example, bolts, and the coupling member 101a is cut out at a part of the joint surface. By providing such a notch in the coupling member 101a, the area where heat is transmitted is reduced. Here, the heat radiating member 154 also functions as a part of a frame (C-shaped rack 100) for positioning the air cylinder 101. For this reason, the structure of the welding head can be made compact (simplified).

  On the other hand, the 2nd welding bit 11b (lower side bit) is being fixed to the flame | frame (C-type rack 100) via the heater bit 131b and the heat insulating material 132b.

  As shown in FIGS. 1 and 2, the adjustment member 12a is screwed into a screw hole provided in the heater bit 131a, and is based on the tightening amount (in other words, the protruding amount of the screw) into the screw hole. Thus, the adjusting screw enables adjustment of the distance between the first welding bit 11a and the second welding bit 11b. On the other hand, the adjustment member 12b is a bar fixed at a position facing the adjustment member 12a on the surface of the heater bit 131b. These adjustment members 12a and 12b function as stoppers that restrict the approach of the welding bits 11a and 11b. That is, as shown in FIG. 1B, the adjustment member 12a and the adjustment member 12b are in contact with each other (the heads are in contact with each other), so that the first interval is set by the adjustment member 12a. The approach (drive of the welding bit 11a by the air cylinder 101) with the welding bit 11a and the 2nd welding bit 11b is controlled. Specifically, the adjustment member 12a (adjustment screw) makes the protrusion amount D1 variable according to the tightening amount. Therefore, based on the tightening amount of the adjustment member 12a, the interval between the first welding bit 11a and the second welding bit 11b when the adjustment member 12a and the adjustment member 12b are in contact with each other, in other words, It is possible to adjust the minimum distance D0 between the bits 11a and 11b (the limit distance at which the bits can approach each other).

  With such a configuration, the user can adjust the tightening amount of the adjustment member 12a (adjustment screw) so that the welding bits 11a and 11b do not excessively crush the multilayer printed wiring board in the welding process. As described above, the interval D0 can be adjusted.

  In this welding machine, the first welding bit 11a and the adjustment member 12a are both provided in the heater bit 131a, and the second welding bit 11b and the adjustment member 12b are both provided in the heater bit 131b. The first welding bit 11a and the adjustment member 12a have, for example, one temperature range (for example, a temperature range corresponding to the welding temperature “280 to 350 ° C.”). )). Specifically, the first welding bit 11a and the adjustment member 12a have the same amount of elongation in the direction in which both the bits 11a and 11b approach each other at least at the welding temperature. The first welding bit 11a and the adjustment member 12a are set to have substantially the same dimensions (for example, length and width). Thus, by setting the dimensions of the first welding bit 11a and the adjustment member 12a to be the same, the thermal deformation characteristics of both can be made closer (preferably matched). With such a structure, even if the first welding bit 11a extends due to a temperature change caused by heating the heater, the adjustment member 12a also extends in the same manner (by the same amount), so the adjustment member 12a and the adjustment member 12b. The distance D0 between the first welding bit 11a and the second welding bit 11b when the two come into contact with each other does not change (or changes are small). In order to equalize the thermal deformation characteristics of the first welding bit 11a and the adjustment member 12a, for example, a material having a similar thermal deformation characteristic (preferably a material having the same or the same thermal deformation characteristic) is used for both. Is desirable. In the present embodiment, the material of the welding bits 11a and 11b and the heater bits 131a and 131b is, for example, brass, and the material of the adjusting members 12a and 12b is, for example, SUS (stainless steel).

  On the other hand, the second welding bit 11b and the adjustment member 12b also have the same amount of elongation in the direction in which the first welding bit 11a and the second welding bit 11b approach each other at least at the welding temperature. The second welding bit 11b and the adjustment member 12b are set to have substantially the same dimensions (for example, length and width). With such a structure, the adjustment member 12a and the adjustment member 12a and the adjustment member 12b extend in the same manner (by the same amount) even if the second welding bit 11b extends due to a temperature change caused by heating the heater. The distance D0 between the first welding bit 11a and the second welding bit 11b when 12b abuts each other does not change (or changes are small).

  Thus, in the welding machine of the present embodiment, the welding bit and the adjustment member are arranged on a common heater bit (heater mounting component), and each heater bit has the same thermal deformation characteristics. That is, even when the heater is heated to a high temperature, the welding bit and the adjustment member are both heated to the same temperature in the vicinity of the heater and undergo similar thermal deformation. For this reason, the interval D0 is kept substantially constant regardless of the heater temperature at least at the welding temperature.

  When a multilayer printed wiring board is manufactured by the above-described welding machine, first, as shown in FIGS. 5A and 5B, for example, an insulating material in which a metal foil such as a copper foil having a thickness of about “18 μm” is attached. Using the substrate, a desired conductive circuit is formed on the surface (for example, both surfaces) by a normal etching technique, and the inner layer plates 501 and 502 are manufactured. At this time, dot-shaped metal patterns 501a and 502a are also formed at predetermined locations where welding is performed in a later step. As the insulating substrate, for example, a substrate made of heat-resistant resin such as thermosetting glass / epoxy resin, glass / polyimide resin, or glass / BT (bismaleimide / triazine) resin can be used. The inner layer plates 501 and 502 are provided with a plurality of positioning reference holes 501b and 502b (only one is shown in FIG. 5B).

  Next, an insulating adhesive material 503 made of, for example, a prepreg having a reference hole 503b corresponding to the reference holes 501b and 502b is inserted between the inner layer plates 501 and 502, for example. As shown in FIGS. 6A and 6B, the reference pin 600 is inserted into the reference holes 501b to 503b, and the inner layer plates 501 and 502 and the adhesive 503 are positioned and overlapped. The prepreg is made of glass fiber impregnated with a thermosetting resin such as an epoxy resin or a polyimide resin. For example, the prepreg may be thermoset by heating and pressurizing and bonded to a double-sided wiring board or copper foil. it can.

  Next, the welding bit 11a is driven by the air cylinder 101, and the set of inner layer plates 501 and 502 and the adhesive 503 is sandwiched from above and below by the welding bits 11a and 11b at the metal patterns 501a and 502a and heated and pressed. . At this time, the adjustment members 12a and 12b function as a stopper for restricting the approach of the welding bits 11a and 11b, thereby suppressing excessive pressurization to the member to be welded at the time of welding. The welding temperature (temperature of each welding bit) is, for example, “280 to 350 ° C.”. As a result, the inner layer plates 501 and 502 and the adhesive 503 are welded to obtain a laminate.

  Next, as shown in FIGS. 7A and 7B, insulating adhesives 505 and 506 (both of which are, for example, prepregs) are stacked on the front and back surfaces (each surface of the outermost layer) of this laminate, respectively. Metal foils 507 and 508 for outer layer conductors are overlapped on the outside and molded by heating and pressing to obtain a desired multilayer printed wiring board.

  With such a manufacturing method, a multilayer printed wiring board can be mass-produced with higher reliability.

  The above embodiment may be modified as follows.

  In the above embodiment, the interval D0 between the bits is adjusted only by the adjustment member 12a on the first welding bit 11a side. However, the adjustment is not limited to this, and instead of the adjustment member 12a or together with the adjustment member 12a. The interval D0 may be adjusted by the adjusting member 12b on the second welding bit 11b side. Specifically, for example, the adjustment member 12b is an adjustment screw that is screwed into a screw hole provided in the heater bit 131b, so that the interval D0 is adjusted based on the tightening amount in the screw hole. Will be able to. Also in this case, as in the case of the first welding bit 11a, the above-described structure is adopted for the adjustment member 12b, the heater bit 131b, and the like, thereby suppressing excessive pressurization to the member to be welded at the time of welding. be able to.

  In the said embodiment, the laminated structure (laminated structure which consists of the heat insulating material 132a, the heat radiating member 133a, and the heat insulating material 134a) was applied to the 1st welding bit 11a (upper side bit). However, the present invention is not limited to this, and a similar laminated structure may be applied to the second welding bit 11b (lower bit). Moreover, you may apply a laminated structure to both the 1st welding bit 11a and the 2nd welding bit 11b.

  Instead of the air cylinder 101, another actuator (for example, an electric motor) may be used. In addition, such an actuator is provided in the second welding bit 11b (lower bit) instead of the first welding bit 11a (upper bit) or in both the first welding bit 11a and the second welding bit 11b. Also good. Furthermore, you may make it provide the actuator which moves both the 1st welding bit 11a and the 2nd welding bit 11b simultaneously, maintaining the positional relationship.

  In the above-described embodiment, the case where a multilayer printed wiring board is manufactured using two inner layer boards 501 and 502 has been described. However, the method for manufacturing a multilayer printed wiring board according to the present invention has more inner layer boards, that is, three or more sheets. The present invention can be applied in the same manner when a multilayer printed wiring board is manufactured using the inner layer board.

(A) is a figure which shows the initial state of this welding machine, (b) is a figure which shows the welding bit proximity | contact state of this welding machine about one Embodiment of the manufacturing method of the welding machine which concerns on this invention, and a multilayer printed wiring board. is there. It is a perspective view which expands and shows a welding head part. It is a front view which expands and shows a welding head part. It is a side view which expands and shows a welding head part. About the 1st process of the manufacturing method of the multilayer printed wiring board concerning this embodiment, (a) is a perspective view of the process, (b) is sectional drawing of the process. About the 2nd process of the manufacturing method of the multilayer printed wiring board concerning this embodiment, (a) is a perspective view of the process, (b) is sectional drawing of the process. About the 3rd process of the manufacturing method of the multilayer printed wiring board concerning this embodiment, (a) is a perspective view of the process, (b) is sectional drawing of the process.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Welding head part 11a 1st welding bit 11b 2nd welding bit 12a, 12b Adjustment member 100 C type frame 101 Air cylinder 101a Connecting member 102a, 102b Heater 131a, 131b Heater bit (heater attachment component)
132a, 132b, 134a Heat insulation material 133a Heat radiation member 151, 152 Bolt 153 Through hole 154 Heat radiation member 501, 502 Inner layer plate 503 Adhesive (interlayer adhesive)
505, 506 Adhesive (interlayer insulation)
507, 508 Metal foil (conductor film)

Claims (8)

A welding machine for welding a member to be welded at a predetermined position,
A first welding bit and a second welding bit which are arranged so as to face each other and are welded by pressurization and heating so as to sandwich the welding member from both sides;
At least one of the first welding bit and the second welding bit is movable in a direction in which the first welding bit and the second welding bit approach each other,
A heater is mounted on the first welding bit by a heater mounting component, and the heater mounting component is provided with a position adjusting member.
The position adjusting member abuts on a predetermined member disposed on the second welding bit side, thereby restricting the approach between the first welding bit and the second welding bit at a predetermined adjustable interval. Is,
The position adjusting member has thermal deformation characteristics similar to those of the first welding bit in at least one temperature region.
A welding machine characterized by that. The position adjusting member has the same dimensions as the first welding bit.
The welding machine according to claim 1. The position adjustment member is an adjustment screw that can be screwed into a screw hole provided in the heater mounting part and adjust the predetermined interval based on the tightening amount into the screw hole.
The welding machine according to claim 1. A heater is mounted on the second welding bit by a heater mounting part,
The predetermined member arranged on the second welding bit side is provided in the heater mounting part of the second welding bit, and has the same thermal deformation characteristics as the second welding bit at least in the temperature region. ,
The welding machine according to claim 1. The predetermined member arranged on the second welding bit side has the same dimensions as the second welding bit.
The welding machine according to claim 4. The predetermined member disposed on the second welding bit side is a screw that is screwed into a screw hole provided in the heater mounting part of the second welding bit, and is based on the tightening amount in the screw hole. Along with the position adjusting member, the predetermined interval can be adjusted.
The welding machine according to claim 4. The temperature region includes at least a welding temperature,
The welding machine according to claim 1. A first step of producing a plurality of inner layer plates;
A second step of inserting an interlayer adhesive between the plurality of inner layer plates, and welding the inner layer plate and the interlayer adhesive at a predetermined location by the welding machine according to claim 1;
A third step of forming a conductor film via an interlayer insulating material on at least one of the outermost inner layer plates among the inner layer plates welded to the interlayer adhesive in the second step;
Comprising
A method for producing a multilayer printed wiring board, comprising:

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