CN116076161A - Heating nozzle and heating nozzle unit - Google Patents

Abstract

A heating tip (2) of the present invention is a plate-shaped heating tip for thermocompression bonding a terminal wire to a terminal member, the heating tip (2) comprising: a soldering iron part (4) which is provided with a soldering iron front end part (7) which is abutted against the lead wire for the terminal on the soldering iron body (6); and a pair of connection arm sections (5) which extend upward from the left and right end sections of the soldering iron body (6) in a state of being separated from each other, and which heat the soldering iron section (4) by passing a current from a power source through the soldering iron body (6), wherein a concave section (13) is formed on at least one surface of the soldering iron body (6) and the connection arm sections (5), and the concave section (13) has wall surfaces (14) which are lowered in a direction intersecting the surface direction of the surface on both sides.

Description

Heating nozzle and heating nozzle unit

technical field

The present invention relates to a nozzle for thermocompression-bonding a lead wire for a terminal to a terminal member, and a nozzle unit provided with a temperature sensor on the nozzle.

Background technique

In the operation of thermocompression-bonding the lead wire for the terminal to the terminal member, for example, in the operation of thermo-compression-bonding the wire to the terminal part of the core when manufacturing electronic components such as chip inductors (chip inductors), heat for thermocompression bonding is used. mouth unit. Specifically, a thermocouple or the like is attached as a temperature sensor to a nozzle whose temperature rises in the soldering iron to form a nozzle unit, and the nozzle unit is attached to a tool holder of a thermocompression bonding device. Then, the thermocompression bonding device is operated, and the lead wire for the terminal placed on the terminal member is rapidly heated by the soldering iron part of the heating tip while pressurizing, thereby the lead wire for the terminal is thermocompression-bonded to the terminal member (for example, refer to Patent No. Literature 1).

In addition, in the process of thermocompression bonding, a part of the coating layer of the lead wire vaporized by heat becomes fume and adheres to the tip surface of the soldering iron. In addition, as the heating tip is repeatedly heated and cooled, the tip surface of the soldering iron is gradually oxidized to form fine unevenness. Therefore, after thermocompression bonding, the adhered coating is peeled off by moving the front end surface of the soldering iron in parallel to the front end surface of the soldering iron while pressing it against a grindstone or abrasive paper, etc., and the front end surface of the soldering iron is removed. Oxide grinding to trim to a clean plane.

prior art literature

patent documents

Patent Document 1: Japanese Patent Laid-Open No. 2001-284781

Patent Document 2: Japanese Patent Laid-Open No. 2012-222316

Contents of the invention

The problem to be solved by the invention

However, in the heater nozzle (heater nozzle unit) described in the above-mentioned patent document, there is a tendency to reduce the cross-sectional area of the portion through which the current passes in order to increase the current density and improve the heat generation efficiency. Specifically, a soldering iron part and a pair of connection arm parts are formed from a conductive plate material, and a thermocouple is attached to the vicinity of the soldering iron part. The front end portion of the soldering iron, and the pair of connecting arms extend upward from the left and right ends of the soldering iron body in a state separated from each other, and allow the current from the power supply to flow through the soldering iron body to heat up the soldering iron portion. In addition, in recent years, there is a tendency to reduce the plate thickness of the heat generating part in order to improve the heat generating efficiency. The cross-sectional area is made smaller. However, if the plate thickness of the heat generating part is reduced, it is difficult to secure rigidity. Therefore, when the operator takes out the heater tip or the holder attached to the device and fastens it, or even polishes the oxide on the front end surface of the soldering iron after thermocompression bonding, cracks or damage may occur near the heat generating part. situation.

In addition, even if the cross-sectional area of the heat-generating part is reduced to improve thermal efficiency, the surface area decreases due to the reduced cross-sectional area, and the cooling time after the current is interrupted becomes longer and the number of operations per unit time decreases. bad situation.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a nozzle and a nozzle unit capable of securing sufficient rigidity even if the cross-sectional area of a portion where current passes and generates heat is reduced.

Solution to the problem

The present invention is proposed in order to achieve the above object, and the heating nozzle according to the first aspect is a plate-shaped heating nozzle for thermocompression bonding the lead wire for the terminal to the terminal member, and is characterized in that,

The heating nozzle has:

a soldering iron part, which is provided with a soldering iron front end that abuts on the lead wire for the terminal on the soldering iron body; and

a pair of connection arms extending upward from left and right ends of the soldering iron body in a state of being apart from each other, and allowing current from a power source to flow through the soldering iron body to raise the temperature of the soldering iron portion,

A recessed portion is formed on at least one surface of the soldering iron body and the connecting arm portion, and the recessed portion has a wall surface descending in a direction intersecting with a surface direction of the surface at an edge.

The heating nozzle according to the second aspect is the heating nozzle according to the first aspect, characterized in that a section in a direction perpendicular to the direction of current flow is formed in a range from the connecting arm portion to the soldering iron portion. A heat generating portion whose area is set to be smaller than a cross-sectional area of other portions through which current flows includes a part of the recess and a part of the wall surface.

The heating tip according to the third aspect is a plate-shaped heating tip for thermocompression-bonding the lead wire for the terminal to the terminal member, and is characterized in that,

The heating nozzle has:

a soldering iron part, which is provided with a soldering iron front end that abuts on the lead wire for the terminal on the soldering iron body; and

a pair of connection arms extending upward from left and right ends of the soldering iron body in a state of being apart from each other, and allowing current from a power source to flow through the soldering iron body to raise the temperature of the soldering iron portion,

A groove portion is formed on at least one surface of the soldering iron body and the connecting arm portion, and the groove portion has wall surfaces descending in a direction intersecting a surface direction of the surface on both sides.

The heating tip according to the fourth aspect is the heating tip according to the third aspect, characterized in that, in the range from the connecting arm portion to the soldering iron portion, a section in a direction perpendicular to the direction of current flow is formed. The heat generating portion whose area is set to be smaller than the cross-sectional area of other portions through which current flows includes part of the groove portion and part of the wall surface.

The heating nozzle according to the fifth aspect is the heating nozzle according to the second or fourth aspect, wherein an oxidation-resistant coating layer is formed at least on the surface of the heat generating part.

The heating nozzle unit according to the sixth aspect is provided with a temperature sensor in the heating nozzle according to any one of the first to fifth aspects, and is characterized in that an oxidation-resistant coating layer is formed on the surface of the temperature sensor.

Invention effect

The present invention has the following excellent effects.

According to the invention of claim 1, a recessed portion is formed on at least one surface of the soldering iron body and the connecting arm portion, and the recessed portion has a wall surface descending in a direction intersecting with the surface direction of the surface at the edge, so that it is recessed. The outer portion of the wall surface of the portion functions as a rib, whereby rigidity can be ensured. In addition, by forming a wall around the recessed portion, the surface area of the nozzle can be increased accordingly, thereby increasing the area in contact with air and improving the heat dissipation function. Therefore, the cooling time can be shortened to shorten the production tact time (takt time), thereby improving the production efficiency.

According to the invention of claim 2, in the range from the connecting arm portion to the soldering iron portion, the area of the cross section in the direction perpendicular to the direction in which the current flows is formed to be smaller than the area of the cross section of other portions through which the current flows. The heat generating part includes a part of the recessed part and a part of the wall surface, so it can contribute to shortening the cooling time of the heat generating part and improve production efficiency.

According to the third aspect of the invention, a groove portion is formed on at least one surface of the soldering iron body and the connecting arm portion, and the groove portion has wall surfaces descending in a direction intersecting with the surface direction of the surface on both sides, so that the groove portion The outer portion of the wall surface of the portion functions as a rib, whereby rigidity can be ensured. In addition, the formation of wall surfaces on both sides of the groove along with the formation of the groove can increase the surface area of the nozzle accordingly, thereby increasing the area contacting air and improving the heat dissipation function. Therefore, the cooling time can be shortened to shorten the tact time, thereby improving the production efficiency.

According to the invention of Claim 4, in the range from the connecting arm portion to the soldering iron portion, the area of the cross section in the direction perpendicular to the direction in which the current flows is formed to be smaller than the area of the cross section of other portions through which the current flows. The heat generating part includes a part of the groove part and a part of the wall surface, so it can contribute to shortening the cooling time of the heat generating part and improve production efficiency.

According to the invention of claim 5, since the oxidation-resistant coating layer is formed at least on the surface of the heat generating portion, easy oxidation can be suppressed and durability can be improved.

According to the sixth aspect of the invention, since the temperature sensor is provided on the heating nozzle, and the oxidation-resistant coating layer is formed on the surface of the temperature sensor, even if heating and cooling are repeated, easy oxidation can be suppressed, and the durability of the heating nozzle unit can be improved. sex.

Description of drawings

FIG. 1 is a perspective view of a nozzle unit in which a linear recess is formed in a lower half of a connection arm.

Fig. 2 is a perspective view of a heating nozzle with a recess formed from the lower half of the connecting arm to the body of the soldering iron.

Fig. 3 is a front view of a heating nozzle in which a recess is formed from a soldering iron part to a lower end portion of a connecting arm part.

Fig. 4 is a front view of a heater nozzle unit equipped with a thermocouple.

Fig. 5 is a cross-sectional view of another embodiment of a groove portion ((a) to (c) are conventional examples, and (d) to (r) are examples).

Fig. 6 is a perspective view of a heating nozzle in which a concave portion is also formed in the middle of a connecting arm portion.

Fig. 7 is a perspective view of a heating nozzle in which a groove is formed in the middle of a connection arm.

Detailed ways

Embodiments for implementing the present invention will be described below with reference to the drawings.

The nozzle unit 1 is configured to include: a plate-shaped nozzle 2 for thermocompression-bonding a lead wire for a terminal to a terminal member; and a thermocouple 3 attached as a temperature sensor.

The heating nozzle 2 is a nozzle formed by processing a plate of a conductive material (tungsten, molybdenum, superhard material, etc.) by wire discharge machining, and as shown in FIG. 2 (the front end portion on the side of the workpiece (terminal lead or terminal member)); and a pair of left and right connecting arm portions 5, which become the upper portion (base portion). Moreover, when the soldering iron part 4 is energized through the connecting arm part 5, the resistance, especially the lower part of the connecting arm part 5 to the soldering iron part 4 whose cross-sectional area is set to be smaller than that of other parts, functions as a heat generating part, which can effectively The temperature of the soldering iron part 4 is raised due to the ground heat, and the temperature of the soldering iron part 4 can be measured by the thermocouple 3 by adopting the above-mentioned structure.

The soldering iron part 4 has a horizontally long soldering iron body 6 that connects the lower parts of the connecting arm parts 5, and a box-shaped soldering iron front end 7 protrudes downward from the bottom of the soldering iron body 6 protruding slightly downward, and the The bottom surface (tip surface) of the soldering iron tip portion 7 can be used as a soldering iron tip surface 8 to be in contact with the lead wire for a terminal. Furthermore, a substantially V-shaped or substantially U-shaped soldering iron concave portion 9 is formed on the upper portion (connecting arm portion 5 side) on the opposite side to the soldering iron front end portion 7 of the soldering iron body 6, and a soldering iron concave portion 9 is formed in the soldering iron concave portion 9. The temperature measuring contact (temperature measuring part) of the thermocouple 3 is fixed in a state where two points of the surface of 9 are in contact with the support.

The connecting arm portions 5 are vertically long components extending upward from the left and right ends of the soldering iron body 6 , and are provided in a state where the connecting arm portions 5 are separated from each other. In addition, an installation hole 11 for attaching to a nozzle holder (not shown) of a thermocompression bonding device penetrates through the upper portion (extended end portion) of the connecting arm portion 5 in the plate thickness direction of the heating nozzle 2, And the installation bolt (not shown) passing through the installation hole 11 is screwed to the nozzle holder, thereby placing the nozzle unit in a posture with the front end portion 7 of the soldering iron facing downward (towards the joining platform (stage) side). 1 Attach to the mouth holder.

In addition, in the heating nozzle unit 1 attached to the nozzle holder, one connecting arm part 5 is electrically connected to one end of a heater power supply (not shown) of the thermocompression bonding device, and the other connecting arm part 5 is electrically connected to Connect to the other end of the power supply for the heater. Furthermore, it is configured such that when the electric current flows from the power supply (power supply for the heater) to the heating tip 2, the electric current flows through the connecting arm parts 5, 5 in the soldering iron body 6, and the soldering iron body 6 is connected to the soldering iron body from the lower end of the connecting arm part 5 to the soldering iron body. The resistance in the soldering iron 6 generates heat, and the tip portion 7 of the soldering iron heats up due to the heat. In addition, although the current in the soldering iron body 6 flows from one connecting arm portion 5 side to the other connecting arm portion 5 side, the cross-sectional area of the reduced-diameter portion located on both sides of the soldering iron concave portion 9 in the path of current flow Since the cross-sectional area is narrower than other parts, the current density becomes highest at the narrowed part, and Joule heat due to resistance tends to be generated around this part.

And, as shown in FIG. 1 and FIG. 2, the heating nozzle 2 is on the front and back of the heating nozzle 2, specifically, in FIG. The half part is formed with an elongated recessed part 13. In FIG. A recessed portion 13 is formed within the range. The recessed portion 13 is a recessed portion that is recessed in the plate thickness direction in any of the drawings, and has a wall surface 14 descending in a direction intersecting the surface direction of the front and back surfaces at its edge. The illustrated recess 13 has a wall surface 14 descending in a direction substantially perpendicular to the surface direction of the heating nozzle 2 (plate thickness direction) at its edge, and is surrounded by the wall surface 14 . If the recessed portion 13 is formed in this way, the outer portion of the wall surface 14 functions as a rib, so even if the cross-sectional area of the heat generating portion is set to be small, the rigidity can be improved by the portion that becomes the rib, thereby The required strength can be ensured. Furthermore, when the wall surface 14 is formed by forming the recessed portion 13 at the same time, the surface area increases corresponding to the area of the wall surface 14 compared with the conventional type without the recessed portion 13, so that the cooling efficiency after the energization is cut off can be improved. This will shorten the time required for the crimping process, and work efficiency, especially in terms of automation, can shorten the tact time, thereby contributing to the improvement of work efficiency.

Furthermore, the shape of the recessed portion 13 is not limited to being formed in a straight line, and, in addition, regarding the range to be formed, if it is arranged in the part included in the heat generating portion from the connecting arm portion 5 to the soldering iron portion 4, then the effect is better. , but is not limited thereto, and the range of lowering from the surface is not limited either. For example, if in the past, when the cross-sectional shape of the heat generating part is square as shown in (a) of Figure 5, when the cross-sectional area of this part is set to be small, as shown in (b) of Figure 5 in the past, The cross section is narrowed in the width direction as shown, or the cross section is narrowed in the thickness direction as shown in (c) of FIG. Can.

That is, as shown in (d) of FIG. 5 , wall surfaces 14 (embodiment 1) can be formed on both sides of each recessed portion 13 under the situation of narrowing in the thickness direction as shown in (d) of FIG. Form wall surface 14 (embodiment 2) respectively at an edge portion on the same side of the front and back of two recessed portions 13 like this, can be at an edge portion on the different sides of the front and back of two recessed portions 13 as shown in (f) of Fig. 5 Form wall surface 14 (embodiment 3) respectively, can form wall surface 14 (embodiment 4) respectively in front and back center as shown in (g) of Fig. 5, can form wall surface 14 (embodiment 4) as shown in (h) of Fig. Both sides form wall surface 14 (embodiment 5) respectively, can form wall surface 14 (embodiment 6) respectively at the single side of a face as shown in (i) of Fig. 5, further also can (j) ( k) As shown in (l), the wall surface 14 is connected to the bottom surface with an arc surface (embodiments 7, 8, and 9). In addition, as shown in (m)(n)(o) of FIG. The shape may be, for example, shapes such as (p) and (q) in FIG. 5 . In addition, the area where the recessed portion 13 is formed is not limited to the area formed on the lower half of the connecting arm portion 5 or on the front and back of the soldering iron portion 4 along the longitudinal direction. The wide portion of the upper half of the arm portion 5 is formed with a plurality of horizontally long depressions 13 parallel to each other. In this way, when a plurality of them are arranged side by side in the wide part, the wall surface 14 of the recessed part 13 can be enlarged effectively, and thus the heat radiation effect per unit area can be reasonably and greatly increased.

Moreover, in order to increase the cooling area of the heating nozzle 2, the groove part 15 may be formed in at least one of front and back. For example, as shown in FIG. 7 , horizontally long grooves 15 may be formed in parallel in multiple stages in the wide portion of the upper half of the connecting arm portion 5 . The groove portion 15 has wall surfaces 14 descending in a direction intersecting the surface direction of the front and back surfaces on at least one surface of the soldering iron body 6 and the connecting arm portion 5 on both sides. Moreover, it is different from the recessed part 13 in that the end part in the longitudinal direction is open.

In this way, when a plurality of grooves are formed side by side in the wide portion, the wall surface 14 of the groove portion 15 can be effectively enlarged, and thus the heat radiation effect per unit area can be reasonably and greatly increased. In addition, gas discharge becomes favorable by opening both ends. In addition, the location where this groove part 15 is formed is not limited similarly to the recessed part 13, and also the width and depth are not limited.

Next, the structure of the thermocouple 3 attached to the heating nozzle 2 and the heating nozzle 2 for attaching the thermocouple 3 is demonstrated.

As shown in FIG. 4, the thermocouple 3 welds the front ends of two kinds of core wires to form a spherical temperature measuring junction (temperature measuring part), and each core wire is covered with an electrically insulating core wire covering material, and further The lead wires are bundled together by being covered with an outer covering material.

In addition, in the heating tip 2 , a lead wire storage portion is provided in the gap between the connecting arm portions 5 , and a fixing portion of the temperature measuring contact is provided in the soldering iron portion 4 . Describe specifically, as shown in FIG. The opening extends, and expands the lower end of the lead wire receiving cavity 20 to communicate with the soldering iron recess 9 .

Furthermore, in each connecting arm portion 5, a notch is formed on a part of the side facing the wire receiving hollow portion 20 and a stop recess 21 is formed respectively in a state of being communicated with the lead receiving hollow portion 20, and each stop A part of the concave portion 21 and the wire receiving cavity 20 (the portion between the stopper concave portions 21 ) is provided with a wire stopper by injecting a resin such as an ultraviolet curable resin or a thermosetting resin and then hardening it, and by this wire stopper. The portion prevents the wire from being deviated from the wire receiving space 20 and protruding from the heating nozzle 2 .

In addition, in the above-mentioned embodiment, although the thermocouple 3 was illustrated as the temperature sensor of this invention, the temperature sensor which has arbitrary structures may be employ|adopted and attached to the heating nozzle 2.

The oxidation-resistant coating layer will be described below.

In the heating tip 2, heating and cooling are repeated every time thermocompression bonding is performed, so the surface is easily oxidized, and the oxidation is particularly significant near the soldering iron part 4 (heating part) and the part where the thermocouple 3 is welded. Therefore, the oxidized part near the heat generating part will be peeled off and the strength will be lowered, causing a defect that it will be broken when pressurized. In addition, the welded part of the thermocouple 3 will be corroded and the strength will be lowered. As a result, the thermocouple 3 will come off and become unusable. bad situation.

Therefore, in the present embodiment, an oxidation-resistant coating layer is formed on the surface of the heating nozzle 2 to improve oxidation resistance. The specific description will be given below including the manufacturing process.

First, as for the metal plate used as the material (base material), specifically, it is preferable to use the so-called tungsten (hardness HV about 430) generally used in the past, which is more excellent in abrasion resistance than tungsten alloy (hardness HV about 200 to 400). Superhard material (hardness HV900 to 2400) (official name: superhard alloy, an alloy formed by sintering hard metal carbide powder), and the plate of the superhard material is cut out into predetermined shape. In addition, in the case of forming the recessed portion 13, it can be processed by electrical discharge machining (using a mold), end mill machining, or the like. In addition, if it is the groove portion 15, the angle can be changed by 90 degrees compared with the case of processing the metal plate as the material, that is, by setting the surface direction of the metal plate parallel to the direction of the wire, the wire can be used. Cutting for processing.

Next, the cut-out piece is subjected to pre-plating treatment, and then immersed in a dissolution tank to conduct electricity, thereby forming an oxidation-resistant coating layer made of nickel on the surface of the cut-out piece, that is, performing nickel plating. cover. Thereafter, after pulling up from the dissolution tank, post-processing such as washing is performed.

Then, the temperature-measuring junction of the thermocouple 3 is laser-welded to the V-shaped or U-shaped temperature-measuring fixing part formed on the upper part of the soldering iron part 4 . In this welding, since the coating of the nickel layer is formed on the surface (fixed contact surface) of the temperature measurement fixing part, the wettability is improved, thereby improving the reliability and welding strength of welding. In addition, if the wettability during welding is improved, the laser output can be suppressed more than conventionally, and damage to the base material can be suppressed, and quality improvement and energy consumption saving can be achieved.

If the welding of the thermocouple 3 is completed, the pre-plating treatment is further carried out, the heating nozzle unit 1 equipped with the thermocouple 3 is immersed in the electrolyte, and the entire surface including the temperature measuring junction of the thermocouple 3 is carried out. Nickel plating.

When the heater nozzle unit 1 produced in this way is used, the oxidation resistance is improved, and therefore peeling and strength reduction due to oxidation of the soldering iron part 4 and the mounting part of the thermocouple 3 can be suppressed, thereby improving durability. In particular, when a superhard material is used as the base material and nickel plating is performed, wettability and weldability can be improved, and durability can be reliably improved. In addition, since the main component of the thermocouple 3 is nickel, the affinity for nickel plating is good. In addition, the oxidation-resistant coating is not limited to nickel plating, and may be, for example, gold plating or the like.

All points of view of the above-described embodiments are examples, and should not be considered as limiting the present invention. The present invention is not limited to the above description, but should be shown in the technical claims, and all changes within the meaning and range equivalent to the technical claims are included. For example, as shown in (r) of FIG. 5 , when forming the depressed portion 13 by press working, a punch (punch) may be inserted to raise the edge of the depressed portion 13 to form the edge again. High and large and the height of the wall surface 14 exceeds the plate thickness (embodiment 15).

Explanation of reference signs

1 heating nozzle unit; 2 heating nozzle; 3 thermocouple; 4 soldering iron part; 5 connecting arm part; 6 soldering iron body; Wall surface; 15 slots; 20 lead wire storage spaces.

Claims (6)

1. A heating nozzle, which is a plate-shaped heating nozzle for thermocompression bonding a lead wire for a terminal to a terminal member, characterized in that, The heating nozzle has: a soldering iron part, which is provided with a soldering iron front end that abuts on the lead wire for the terminal on the soldering iron body; and a pair of connection arms extending upward from left and right ends of the soldering iron body in a state of being apart from each other, and allowing current from a power source to flow through the soldering iron body to raise the temperature of the soldering iron portion, A recessed portion is formed on at least one surface of the soldering iron body and the connecting arm portion, and the recessed portion has a wall surface descending in a direction intersecting with a surface direction of the surface at an edge. 2. The heating nozzle according to claim 1, characterized in that, In the range from the connecting arm portion to the soldering iron portion, there is formed a heat generating portion whose cross-sectional area in a direction perpendicular to the direction in which current flows is set to be smaller than the cross-sectional area of other portions through which current flows. , a part of the recessed part and a part of the wall surface are included in the heat generating part. 3. A heating nozzle, which is a plate-shaped heating nozzle for thermocompression bonding a lead wire for a terminal to a terminal member, characterized in that, The heating nozzle has: a soldering iron part, which is provided with a soldering iron front end that abuts on the lead wire for the terminal on the soldering iron body; and a pair of connection arms extending upward from left and right ends of the soldering iron body in a state of being apart from each other, and allowing current from a power source to flow through the soldering iron body to raise the temperature of the soldering iron portion, A groove portion is formed on at least one surface of the soldering iron body and the connecting arm portion, and the groove portion has wall surfaces descending in a direction intersecting a surface direction of the surface on both sides. 4. The heating nozzle according to claim 3, characterized in that, In the range from the connecting arm portion to the soldering iron portion, there is formed a heat generating portion whose cross-sectional area in a direction perpendicular to the direction in which current flows is set to be smaller than the cross-sectional area of other portions through which current flows. , a part of the groove part and a part of the wall surface are included in the heat generating part. 5. The heating nozzle according to claim 2 or 4, characterized in that, An oxidation-resistant coating layer is formed on at least the surface of the heat generating portion. 6. A heating nozzle unit, which is provided with a temperature sensor near the soldering iron portion of the heating nozzle according to any one of claims 1 to 5, characterized in that, An oxidation-resistant coating layer is formed on the surface of the temperature sensor.

Images