JPS59100590A - Waxing processor for soldering device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wax processing section of a soldering device that sprays molten wax onto a printed circuit board on which electronic components to be soldered are attached to temporarily fix the soldering device.

Fig. 1 is a block diagram showing an example of conventional soldering equipment, where 1 shows the entire soldering equipment, 2 shows the processing equipment for preliminary soldering, 3 shows the cutting equipment, and 4 shows the processing equipment for final soldering. It is a device. In this apparatus, 5 and 9 are Franks processors, 6110 is a preheater, 7 is a dip type solder bath, 8 and 12 are coolers, and 11 is a jet type solder bath.

FIG. 2 is a partial side cross-sectional view showing a mode in which electronic components are mounted on a printed circuit board, where 13 is a printed circuit board, 14 is an electronic component such as a resistor, capacitor, IC, etc., and 15 is a lead wire of the electronic component 14. (f is a lead terminal), 16 is a through hole through which the lead wire (or lead terminal) 15Y is inserted.

In this way, with conventional soldering equipment, the printed circuit board 13 is heated and molten solder is applied twice, once for preliminary soldering and once for final soldering, resulting in a large amount of solder consumption. and electronic components 14
In addition, when final soldering is performed after inserting the lead terminals 15 of IC components into the through holes 16 of the printed circuit board 13, the IC components may be lifted up by the force of the solder jet. There were drawbacks.

In addition, since processing equipment 2 for preliminary soldering has the same equipment as processing equipment 4 for finishing soldering, equipment 1 for soldering
The whole thing is thicker, and the soldering is done using device 1'? :The disadvantage is that it requires a large space to install and is expensive.This invention was made to solve the above disadvantages.After spraying the melting socks onto the top surface of the printed circuit board, For soldering, in which electronic components are covered with wax and temporarily fixed to a printed circuit board, a wax processing section of the device is provided.

The present invention will be explained below based on the drawings.

FIG. 3 is a schematic configuration diagram showing an embodiment of the present invention.
shows the entire Samurai device with carrier-less soldering. 2
Reference numeral 2A indicates a fixed-side conveying chino, 22B a movable-side conveying chino, 23 a processing device with wax, 24 a wax processing section, and 25 molten wax that has been turned into a liquid fluid by heating. Further, the same reference numerals as in FIGS. 1 and 2 indicate the same parts.

Next, let me explain the operation shown in Figure 3.

Mount the electronic component 14 on the printed circuit board 13 and connect the lead wire 1
5 protrudes downward.

Next, molten wax 25 is sprayed onto the top surface of the printed circuit board 13 in the wax processing section 24, and then the sprayed molten wax 25 is solidified in the cooler 8, so that the electronic components 14 are solidified on the printed circuit board 13. Covered with wax and fixed.

In the case of an IC component, the molten wax 25 also penetrates between the lead terminal 15 and the through pole 16 and is fixed.

The lead wire 15 is cut by the cutting device 3,
Finish soldering is done using processing device 4 and flux processing device 9. Preheater 10. Solder bath11. The cooler 12 is soldered through each processing step.

4(a) and 4(b) show the wax processing section 24 of FIG. 3, FIG. 4(a) is a partially cutaway perspective view, and FIG. 4(b) is a partially cutaway perspective view of FIG. 4(a). FIG. 2 is an enlarged side sectional view taken along the line XX. In these figures, the same reference numerals as in Fig. 1 and 3 are omitted, and 26 indicates a reservoir for storing the molten wax 25.
2T is a gear pump provided on the F side of the wax tank body 26 to pressurize and send out the melting sock 25; 28 is a motor that drives the gear pump 27;
29 is a control valve that adjusts the flow rate and pressure of the melting sock 25; 30 is a passageway for the melted wax 250; 31 is a filter that removes dust mixed in the melted wax 25; and 32 is the melted wax that has been filtered by the filter 31. 2
33 is a plurality of pipes branched from the passage 32 and connected in parallel; 34 is a flexible cape heater wrapped around the outer circumference of the pipe 33; :Trace 7) The bath melting wax 25 is heated to 5 to prevent it from solidifying.

35 is a heat insulating material covering the outer periphery of the cape heater 34; 36;
is a spraying device for spraying the molten wax 25, and one sprayer is used to spray the molten wax 25 onto each of the plurality of pipes 33 via the connecting fittings 37'a'.
They are attached one by one, and the soldering shown in Figure 3 is done on device 2.
A plurality of printed circuit boards 130 are arranged in a direction perpendicular to the running direction of the printed circuit boards 130 that are transported by one of the transport chees 722A and 22B. 38 is a thermostat for detecting the temperature of the socks 25 in the wax tank body 26. Note that 39 is a removable lid for removing dust and the like from the filter 31, and 40 is a control panel.

In the gear pump 27, 41 is a drive shaft, and the motor 28
is connected to. 42 is a driven shaft.

In FIG. 4(b), reference numeral 43 indicates a horn id for assembling the gear pump 27, and a semicircular kite shaft 44 is used for fixing the gear pump 27 to the wax tank body 26. 45 is a disc-shaped upper case, 46.47 is a pair of spur gears, as shown in Fig. 4 (b).
) - The spur gear 46 is fixed to the drive shaft 41 and the spur gear 41 is fixed to the driven shaft 42 by meshing with each other. 4B is the spur gear 46, 4 on the lower surface of the upper case 45.
A gear case 49 is housed by enclosing the side surface 2 of γ and is the same as when the gear case 48\2T is assembled. In addition, 44a is formed on the hard fitting 44, and 44a is used for introducing the molten wax 25.
Reference numerals 5a and 48a refer to delivery holes for supplying the molten wax 25 which has been mixed with the liquid from the introduction port 44a, 51 refers to supply holes for supplying the molten wax 25 from the gear pump 2T to the passage 30, and 49b and 52 refer to the above-mentioned Control valve 29 from passage 30.32
The molten wax 25 is refluxed through the reflux hole.

Next, the operations shown in FIGS. 4(a) and 4(b) will be explained.

The wax inserted into the wax tank body 26 is heated by a heater (
(not shown) to become a molten wax 25,
The temperature is detected by the thermostat 38 and the control panel 40
The temperature is maintained at a constant temperature by operation at .

The motor 28 drives the pair of spur gears 4 of the gear pump 2T.
6.47 rotates, the molten wax 25 in the wax tank body 26 is sucked and enters the inlet 44a, and enters the supply hole 4.
5a, 48a'l' (arrow A) spur gear 46.47
, and further enters the passage 30 through the delivery holes 48b, 49a and the supply hole 51 (arrow B).

The molten wax 25 in the passage 30 enters the inside of the filter 31, passes through the passage 32 (arrow C) after removing dust, etc., and branches into a plurality of vibrators 33 (arrow D), each of which has a different injection amount. [Injected from 36 and printed circuit board 13,
Spray the entire electronic component 14 mounted on the top surface.

On the other hand, the molten wax 25 in the passage 32.30 is
9 controls the flow rate and pressure, and from the passage 32.degree. 30, the flow passes through the control valve 29 as shown by arrows E and F in FIG.
．． It is refluxed to 47.

FIG. 5 is an exploded perspective view of the gear pump 27'5r. The same parts as in FIGS. 49c is a support hole for the drive shaft 41; 44d and 45d are insertion holes for the driven shaft 42 to be rotatably inserted; 49d is a support hole for the driven shaft 42; 46;
47c is a small fixing hole for fixing the spur gear 46 to the driven shaft 42; 44e is a fixing hole for fixing the spur gear 47 to the driven shaft 42;

45 e, 48 e, 49 e are the drive shafts 41. when the guide shaft 43 is inserted and assembled. Driven shaft 42
゜Attach the guide shaft 43 to the base 49, and then attach the spur gear 46
．． 47 and drive shaft 41. It is fixed to the driven shaft 42. Next, the gear case 48 is placed on the base 49, and the spur gears 46.47'Y are housed. Next, the upper case 45 is placed over the top of the gear case 48 to seal the spur gears 46.47'Y.
Furthermore, the fixture 44 is placed and the whole is tightened with screws 50 to form the gear pump 27, which is attached to the 4fHMiP wax tank body 26 and connected to the drive shaft 41 and motor 28.

Note that the operation of the gear pump 27 shown in FIG. 5 has been explained in FIGS. 4(a) and 4(b), so it will be omitted here.

FIG. 6 is a side sectional view showing details of the control valve 29, and FIG.
The same reference numerals as in b) indicate the same parts, and 61 is the control valve 2.
9, the wax valve body 26V is fitted.

Reference numeral 62 denotes an adjustment valve screwed into the valve box 61, which adjusts the flow rate of the molten wax 25 by rotating. 63 is a safety valve,
Automatically adjust the pressure of the LD melting wax 25′1″ center.6
4 is a valve seat of the adjustment valve 62, 65 is a valve seat of the safety valve 630, 66 is a spring that presses the safety valve 63 against the valve seat 65Vc, and 67 is a valve seat on the adjustment valve 62 side provided at one longitudinal end of the valve box 61. An introduction hole 68 is a hole on the safety valve 63 side provided at the other longitudinal end of the valve box 61, and 69 is an introduction hole 6.
The discharge hole on the reflux hole 52 side provided in the middle of 7.68, 70 is an O-ring for water and soil.

Next, the operation shown in FIG. 6 will be explained.

The molten wax 25 pressurized by the rotation of the spur gears 46 and 47 of the gear pump 2T flows from the supply hole 511 passage 30 to the fourth
Passage 32 and each pipe 33 through filter 31 in figure (a)
The molten wax 2 in the passage 32 is also injected through the injection device 36, but if you want to adjust the amount of injection, turn the adjustment valve 62 to increase the gap between the adjustment valve 62 and the valve seat 64.
5 is diverted and enters the valve box 61 from the introduction hole 67,
Rough valve seat 64. The water is sent to the reflux hole 52 through the discharge hole 69 and is then used. On the other hand, the flow rate of the molten wax 25 is adjusted.

If the pressure becomes higher than the predetermined pressure before stopping the injection, a part of the molten wax 25 in the passage 30 is diverted to the introduction hole 6.
The safety valve 63 resists the pressing force of the spring 66 and is suppressed, and the valve seat 65 opens, so that it enters the valve box 61 and is sent to the reflux hole 52 via the discharge hole 69.

FIG. 7 is a side view showing details 2 of one of the injection devices 11136 in FIG. 4 Ca), where the same reference numerals as in FIG. The core is screwed together by a threaded portion 72. 73 is an introduction hole for the molten wax 25 provided on the side of the valve box T1, T4 is a valve stem, and T
5 is a valve, T6 is a valve seat, 77 is a connecting fitting that is equipped with the valve seat T6 and is fitted to one end of the valve box T1, 78 and 79 are outlet fittings, 80 is a nozzle edge, and 81 is a mounting of the nozzle 80. 82 is the valve 75
A spring acts in a direction to press the valve seat 76r, 83 is a gasket, 84 is an air cylinder, and 85 is a piston fixed integrally with the valve shaft 74 protruding from the other end of the valve box T1.

Next, the operation shown in FIG. 7 will be explained.

The molten wax 25 pressurized by the gear pump 2T of the wax tank main body 26 in FIG. The filter 312 passes through the passage 32, passes through the vibrator 33 shown in FIG.

When the bullet board 13 passes below the injection device 36,
Pressurized air is introduced into the air cylinder 84 by detection by a detector such as a phototube (not shown), and the piston 85 is actuated to press the valve shaft 74'r against the pressing force of the spring 82, so that the valve T5 is pressed against the valve seat. Released from T6. When the valve seat T6 is opened, the molten wax 25 in the valve box 71 is also injected through the nozzle 80 through the outlet fittings 78 and 79, and is sprayed onto the printed circuit board 13.

゛ Note that the nozzle 80 may be directly attached to the valve seat 76 of the connecting fitting T1.

As explained above, the present invention has a wax tank body that stores molten wax, and a gear pump that drives a pair of spur gears to pressurize and send out the molten wax in the wax tank body. A control valve is provided below to control the flow rate and pressure of the molten wax by returning a portion of the molten wax sent from the gear pump to the gear pump, and the molten wax sent from the gear pump via the control valve is provided with a control valve that controls the flow rate and pressure of the molten wax. A plurality of injection devices are arranged in sequence in a direction perpendicular to the running direction of the printed circuit board.
Pre-soldering, which temporarily fixes electronic components, does not require equipment, and pre-soldering does not consume the solder used in the process (
In addition, since there is no preheating required, damage and deformation of electronic components and printed circuit boards due to heat effects can be prevented. In addition, since molten wax is sprayed onto the entire top surface of the cylinder board to cover it with solidified wax and fix it, it is possible to prevent the IC components from lifting off from the cylinder board due to the force of the jet solder during the final soldering process. This reduces the number of defective products and improves the quality of printed circuit boards. In addition, since a preheating device is not required and the entire wax processing section can be made compact, the entire device for r,9 soldering is compact, and soldering reduces the power consumed by the device, equipment costs, etc. It has the advantage of being able to reduce

[Brief explanation of the drawing]

Fig. 1 is a blank diagram showing an example of a conventional soldering device, Fig. 2 is a partial side cross-sectional view showing how electronic components are mounted on a printed circuit board, and Fig. 3 is an embodiment of the present invention. A schematic diagram showing the configuration, FIG. 4(a). 4(b) shows the wax processing section in FIG. 3, FIG. 4(a) is a partially cutaway perspective view, and FIG.
), Fig. 5 is an enlarged perspective view showing the gear pump disassembled, and Fig. 6 is a detailed view of the control valve #I.
FIG. 7 is an enlarged side sectional view showing details of the injection device. In the figure, 3 is a cutting device, 4 is a processing device for final soldering, 8 is a cooler, 9 ('j-Franks processing device, 1
0 is a preheater, 11 is a soldering bath, 13 is a printed circuit board, 14 is an electronic component, 15 is a lead wire (or lead terminal), 16 is a through hole, 21 is a soldering device, 22
A, 22B are conveyance chains, 23 is a wax processing device, 24 is a wax processing section, 25 is a stone age wax, 26
is wax (3 main body, 2T is gear pump, 28 is Tanabata, 29 is control valve, 30.32 is passage, 31 is filter,
33 is Vine, 34 is a TV heater, 35 is a heat insulator, 3
6 is the injection device, 3T is the connection fitting, 3B is the thermostat, 39 is the main body, 40 is the control panel, 41 is the drive shaft, 42 is the driven shaft, 43 is the guide shaft, 44 is the fixture, 45 is the upper case, 46. 47 is a spur gear, 48 is a gear case, 49 is a base, 50 is a fixed foot screw, 51 is a supply hole, 52 is a return hole, 61
is the valve box, 62 is the adjustment valve, 63 is the safety valve, 64.65 is the valve seat, 6ti is the spring, 67.68 is the introduction hole, 69 is the discharge hole, 71 is the valve box, 12 is the threaded part, 73 is the introduction hole , 14 is a valve shaft, 75 is a valve, T6i'r is a valve seat, 80 is a nozzle, 82
84 is an air cylinder, and 85 is a piston. Figure 4 (b) Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] The molten wax 2 is stored in the wax tank main body 1, and the molten wax is pressurized by a pair of spur gear drives 1llIIvC in the wax tank main body, and the gear pump 7 is installed below the wax tank main body. A control valve is provided for controlling the flow rate and pressure of the molten wax by returning a portion of the molten wax sent from the gear pump to the gear pump, and further includes a control valve for controlling the flow rate and pressure of the molten wax sent from the gear pump via the control valve. The plurality of injection devices for injecting the molten wax intermittently were distributed sequentially in a direction perpendicular to the running direction of the printed circuit board.