JP2009033011A - Connector press-fitting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the following problems: in a connector press-fitting device, it is necessary to exchange a plurality of upper jigs to press-fit connectors, but pressing force of ≥1 ton is required when press-fitting the connector; thus, a solid and heavy press-fitting section must be produced, which impedes a high-speed working from being performed. <P>SOLUTION: The connector press-fitting device is configured such that: the press-fitting section, which moves within a working range, is constituted in a lightweight so that it can perform the high-speed working; and compressive force is always applied to a load cell. Accordingly, insertion pressure can be easily controlled so that a press-fit connector can be securely mounted. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to an apparatus for press-fitting a connector into a board provided with printed wiring frequently used for electronic components, and more particularly to an apparatus for press-fitting a solderless connector called a “press-fit connector” into the board.

In recent years, the number of cases in which a solderless press-fit connector “press-fit connector” is employed in an assembly process of an apparatus using a substrate is increasing. While conventional connectors are connected by soldering when mounted on a substrate, the press-fit connector method can be mounted by a simple method by press-fitting, and the process can be simplified.
In addition, there is an active movement to reduce harmful substances and environmentally hazardous substances in society, and manufacturing industries are required to make products that do not contain these substances regardless of the field. The press-fit connector is a manufacturing method adapted to the times.

  The press-fit connector is energized by inserting a plurality of terminals (press-fit portions) into through-hole portions formed in a printed circuit board (hereinafter referred to as a substrate) and contacting each other. Therefore, the fitting relationship between the press-fit portion of the terminal and the through hole of the printed circuit board is designed to be an interference fit, and contact energization is performed by the restoring force generated by the interference.

For this reason, the press-fit connector press-fitting device needs a sufficient pressure for insertion. Usually, a press-fit connector is set in a connector press-fitting device in a state of being temporarily inserted into a board, and is inserted and mounted by a connector press-fitting device. In order to mount the press-fit connector on the printed circuit board, a dedicated pressure jig is required.
The initial press-fit connector press-fitting device manually press-fits the press-fit connectors temporarily inserted into the board one by one.

  Generally, an upper jig and a lower jig are used as the press-fitting jig, and the upper jig has a shape that can be easily press-fitted according to the shape and direction of the press-fit connector. The lower jig is made so that the board is not distorted and deformed by the pressure when press-fitting the press-fit connector, and when the terminal of the press-fit connector penetrates through the through-hole of the board, The tip of the terminal of the press-fit connector that pops out is protected so as not to hurt.

Conventionally, the substrate was placed on the lower jig, positioned, and then the upper jig was manually press-fitted and assembled. However, in these press-fit connector press-fitting devices using a hydraulic cylinder or a crank mechanism, pressure accuracy such as pressure and insertion distance (stroke amount) cannot be increased, and press-fitting conditions are limited.
In addition, as proposed in Patent Document 1, there has also been proposed a method of automatically setting and press-fitting various conditions that are automatically set when a switch is turned on by motor driving or the like. However, in this method, as shown in FIG. 11, after placing the substrate on the table 90 and positioning, the upper jig 91 is lowered by a motor or the like to press-fit the press-fit connector, and the upper jig 91 is aligned with the press-fit connector. Had to be replaced manually.
That is, the press-fitting portion 92 is configured so that the press-fitting position and direction are not changed by the deflection during press-fitting. Instead, the pressing position is changed by moving the table 90.

  However, as shown in FIG. 7, the shape of the press-fit connector 20 is various, and it is also necessary to assemble a plurality of press-fit connectors 201 and 202 on one substrate 80. In such a case, the upper jig 91 corresponding to the press-fit connectors 201 and 202 had to be replaced with the substrate 80 attached to the lower jig.

  Therefore, the press-fit portion 92 must move to pick up the upper jig 91 and move to a position corresponding to a predetermined press-fit connector 201.202 to press it. To make the press-fit portion 92 and the main body 922 robust so that the press-fit position and direction do not change due to deflection during press-fit, and to pick up the upper jig 91 at high speed and move it onto the press-fit connector 201.202 to stop it accurately Is a contradictory task requiring considerable driving force.

  The press-fit connector 20 changes the pressure input to be pressed depending on the number of terminals 21. When press-fitting the press-fit connector 20 having a large shape and a large number of terminals 21, a pressing force of 1000 kg or more is required. Since the press-fit connector 20 is a precision part, it is necessary to accurately press the press-fit portion 92 without shaking when press-fitted. Therefore, the press-fit portion 92 of the press-fit connector 20 must be made robustly so that distortion does not occur with a pressing force of about 1 ton.

  Therefore, in order to prevent the holding portion of the press-fit portion 92 from being distorted or distorted, the press-fit portion 92 and the portion holding the press-fit portion 92 are large and heavy, and the moving speed of reciprocating the upper jig 91 is not slow. Did not get. Then, even when the press-fitting portion 92 is stopped within the working range or accelerated for movement, a large output is required, resulting in a large apparatus. Also, since the high-speed work cannot be performed, the work speed is slow and the efficiency is not good.

Therefore, an application as shown in Patent Document 2 (Japanese Patent Application No. 2007-142697) has been filed by the present applicant. In this method, as shown in FIG. 10, the reaction force of the pressing force generated by the screw 95 is received when the gear case 94 is brought into pressure contact with the top plate 70.
With this configuration, the press-fitting part 92 and the conventional example main body 922 are constituted by the press-fitting part 100, the holding part 97 and the like, which are manufactured to be lightweight and small, and can be moved at high speed, thereby greatly improving work efficiency. Then, when press-fitting, the reaction case at the time of press-fitting is released by pressing the case case 94 against the top plate 70.
In other words, the moving part and the reaction force receiving part are configured separately, such as the moving press-fitting part 100 and the top plate 70 that receives the reaction force at the time of press-fitting, thereby solving the contradictory problems of high speed and robustness. is there.

  As a result, the entire press-fit portion 100 does not have to be robust, and the reaction force can be released to the top plate 70 even when a pressing force of 1 ton or more is applied. Therefore, the light and small press-fit portion 100 can move at high speed, and the working efficiency can be greatly increased. With the above configuration, the conflicting problems described above can be solved.

However, in the method of FIG. 10, since the gear case 94 is raised by the downward pressing force generated by the screw 95 and brought into contact with the top plate 70, the holding portion 97 and the slide portion 96 are held by rattling or the like. Even if the portion 97 is accurately positioned, the press-fitting portion 100 may be slightly moved during press-fitting, and the position of the press-fitting portion 100 that is accurately positioned may be displaced, causing bending or the like in the terminal 21 of the press-fit connector 20. There was a cause.

  Further, as shown in FIGS. 7 and 8, the press-fit connector 20 inserts a plurality of terminals 21 provided in the press-fit connector 20 into the through holes 81 opened in the substrate 80, and the terminals 21 and the through holes 81 are inserted. When the wall surface plating layer 811 comes into contact with each other, electricity is supplied.

The general inner diameter of the through holes 81 in FIG. 8 is about 0.6 mm, and the interval between the through holes 81 is about 1 mm. The substrate 80 is formed by overlapping layers of printed wiring, and the printed wiring pitch is generally about 0.1 to 0.2 mm.

  The connection process between the terminal 21 of the press-fit connector 20 and the through hole 81 is performed in the order of (1) to (3) in FIG. A through hole 23 is formed at the center of the portion where the terminal 21 is inserted, and the terminal 21 is formed with a bulging portion 22 that is widened in both directions.

  The bulging portion 22 is formed wider than the diameter of the through hole 81 opened in the substrate 80. When the press-fit connector 20 is press-fitted, the bulging portion 22 is deformed so as to be contracted in the direction of the through hole 23 and inserted into the through hole 81. Therefore, the wall surface plating layer 811 and the bulging portion 22 of the through hole 81 are in an interference fit state, and the bulging portion 22 and the wall surface plating layer 811 are in an interference fit state so that they can be reliably contacted and energized. ing.

  For this reason, the press input of the press-fit connector 20 first increases in pressure input as the insertion distance (stroke amount) advances. Next, the bulging portion 22 is contracted and plastically deformed, so that the pressure input is reduced despite the progress of the insertion distance (stroke amount). Thereafter, as shown in (3) of FIG. 8, the convex portion 211 of the main body of the press-fit connector 20 comes into contact with the substrate 80, whereby the pressure input rises again. Usually, the press-fit connector 20 is provided with a convex portion 211 that comes into contact with the substrate 80 so that the terminal 21 is not inserted into the through hole 81 any more. The relationship between the insertion distance (stroke amount) and the pressure input can be expressed by a curve such as the graph of a in (1) of FIG.

However, there is an error in the correlation between the insertion distance (stroke amount) and the pressure input, and there are several patterns as shown in the graphs b and c in (1) of FIG. If the curve is represented by a curve like a, the insertion distance (stroke amount) may be set to a constant value (for example, as in the Z position) and the press-fitting operation may be stopped. The press-fit operation is stopped in a state where the press-fit connector 20 inserted with a curve like b is not completely inserted. Further, in the case of the press-fit connector 20 inserted with a curve like c, there is a possibility that the board 80 may be damaged at the set insertion distance (stroke amount).
JP 2006-73808 Japanese Patent Application No. 2007-142697

As described above, the connector press-fitting device must replace the upper jig 11 in accordance with the shape of the press-fit connector 20. As shown in FIG. 6, the press-fitting part 10 picks up the upper jig 11 (113.114), and stops accurately just above the press-fit connector 20 (203.204) temporarily inserted into the board 80 installed on the lower jig 12. Each press-fit connector 203.204 temporarily inserted must be press-fitted.
Further, the press-fit portion 10 must move between the upper jig 11 and the press-fit connector 20 as fast as possible.

Therefore, if the work speed is increased, the press-fit portion 10 must be reduced in size and weight. Further, it is necessary to reduce the weight of the portion that holds the press-fitting portion 10 to reduce the inertia. However, it is necessary to generate a pressure input of 1 ton or more during press-fitting so that no deflection occurs. Therefore, as shown in Japanese Patent Application No. 2007-142697, the press-fit part 10 is made small and light and can move at high speed, and the top plate 70 that receives the reaction force at the time of press-fitting is fixed at the press-fitting position. The press fitting part 10 and the top plate 70 are brought into contact with each other, and the top plate 70 and the press fitting part 10 are separated at the time of movement so that they can be moved only by the press fitting part, so that the conflicting problems can be solved.
However, in the structure of the conventional press-fit portion 100 as shown in FIG. 10, the press-fit portion 100 as a whole rises through the slide portion 96 due to the reaction force that comes into contact with the press-fit connector 203.204 into which the upper jig 98 is temporarily inserted.

If the press-fit connector 203.204 is tilted and temporarily inserted, an oblique force is generated in the holding part 97, the press-fitting part 100 is slightly moved, or the slide part 96 is rattled or deformed, and the top plate 70 and the gear case An error may occur in the press-fitting direction due to the slight movement of the contact position of 94.

Further, in the case of the conventional press-fitting portion 100 as shown in FIG. 10, when the upper jig 98 is attached, a load is applied to the load cell (pressing force measuring means) 99, so that a tensile load is generated in the load cell 99. Only when the upper jig 98 is in contact with the temporarily inserted press-fit connector 203.204, a compressive load is applied, so that the measurement of the pressure input is not sufficient, and an error occurs in the measurement result of the pressure input.
This is because immediately after the upper jig 98 comes into contact with the temporarily inserted press-fit connector 203.204, the weight of the upper jig 98 itself is applied to the press-fit connector 203.204, and the actual actual pressure input cannot be measured.

The load cell is a load converter that converts the weight of an object, that is, a load into an electric signal. In order for weight to be output as a change in voltage, the strain body deforms, strain occurs and the strain gauge attached to the strain body replaces the strain with a change in electrical resistance, which is then bridged into a voltage change. It is measured by replacing with. It is described as a pressing force measuring means in the claims of this application.

In order to measure within a range in which the load cell changes from stretching to shrinking, there are many errors and the size increases. Therefore, it is desirable to measure only by stretching or shrinking if possible. In the case of the device of the present application, in order to accurately measure the insertion distance (stroke amount), it is preferable to measure in the contraction direction of the load cell. This is because the strain body has a smaller strain amount in the contraction direction and is suitable for accurately measuring the insertion distance (stroke amount).

  In addition, since the upper jig 11 needs to be changed for each type of press-fit connector 20, the weight changes depending on the size of the upper jig, the initial load of the pressure input changes as a tensile load, and accurate pressure input Was being measured without being measured.

Since accurate press input is not measured, even if it is set to stop press-fitting when the set pressure is reached, the press-fit operation is stopped with the press-fit connector 20 not fully inserted. Or press-fitting until the substrate 80 is damaged, and it is necessary to measure the relationship between the accurate insertion distance (stroke amount) and the pressure input.

The pressure input during the insertion work of the press-fit connector 20 increases as the insertion distance (stroke amount) increases, but after the bulging part 22 of the terminal 21 is inserted into the through hole 81, the bulging part 22 becomes plastic. Since it is inserted in a deformed state, it is lowered once, and then the pressure input starts to rise after the convex portion 211 of the press-fit connector 20 comes into contact with the substrate 8 again. In addition, since an error is caused by each press-fit connector 20, it is difficult to control the timing to stop pressing.

The board 80 is stacked in many layers, and fine wiring is printed inside. When pressure is applied more than necessary, the convex part 211 of the press-fit connector 20 changes the wiring pattern inside the board 80. In some cases, it is necessary to perform press-fitting work by controlling the press-fitting to be stopped at a timing when the press-fitting is accurately measured and the substrate 80 is not pressed as much as possible.

Therefore, a pick-up part having a work range between the pick-up position and the press-fitting position of the upper jig, and a press-fit connector temporarily inserted into the board by pressing the upper jig at the press-fitting position by the jack part are attached to the board. In a press-fitting device for press-fitting, a holding plate provided with a moving means for moving the pickup unit within the working range, and a jack part that receives a reaction force when the jack part is pressed at a press-fitting position are provided. The jack portion is formed by pressing a top plate, a first guide fixed to the holding plate and vertically moving the jack portion, and an upper portion of the jack portion and a lower portion of the top plate. And a push-up cylinder for fixing the press-fit position to the press-fit position, and the jack portion is pressed against the top plate and presses the pickup portion. When the upper jig is pressed and the connector is press-fitted into the substrate, the press-fitting reaction force is supported by the top plate, and a connector press-fitting device is provided. .
The jack portion includes a movable portion that moves up and down, a vertically moving flange that moves up and down as the movable portion moves up and down, and a pressing force measurement that measures the pressing force of the jack portion attached to the lower end portion of the vertically moving flange. Means, a pickup plate pressing plate for transmitting the pressing force to the pickup unit via the pressing force measuring unit, and a crimping spring for always pressing the pickup plate pressing plate to the vertically moving flange. The connector press-fitting device according to claim 1 is provided.

The jack unit includes a stroke measuring unit that measures a movement distance of the pickup unit in the press-fitting direction, a calculation reset unit that resets a measurement value of the pressing force measuring unit when the jack unit starts to be pressed, and the pressing unit. The pressure measuring unit includes a pressing force control unit that controls the pressing force of the jack unit based on the pressing force and the stroke amount measured by the stroke measuring unit, and the stroke measuring unit measures When the pressing force that has risen as the stroke amount increases once decreases and the pressing force increases again to reach the set pressing value, the press-fitting operation of the pickup unit is stopped and finished. A connector press-fitting device characterized by being controlled as described above is provided.
Further, a linear approximation formula is obtained for a pressure change when the stroke amount measured by the stroke measuring unit is increased and the increased pressing force is once decreased and the pressing force is increased again, and the linear approximation formula is increased. The connector press-fitting device is characterized in that when the angle reaches a set angle, the press-fitting operation of the pickup unit is controlled to be stopped and finished.
Further, the stroke amount measured by the stroke measuring unit is increased and the average value in the designated stroke when the raised pressing force is once lowered is calculated, and the pushing force is increased again to increase the stroke in the designated stroke. The connector press-fitting device is characterized in that when the average value is reached, the press-fitting operation of the pickup section is controlled to be stopped and finished.

In the present invention, the push-in cylinder 37 is extended before the press-fit portion 10 starts press-fitting, and the push-up pin 38 is pushed up to press the jack portion 50 against the top plate 70. A more accurate insertion operation can be performed by generating a tension during this period and fixing the press-fitting portion 10 so as not to slightly move.
Then, the reaction force when the press-fitting is started is transmitted from the pickup part 30 to the jack part 50 so as to be released to the top plate 70, and the holding plate 36 of the press-fitting part 10 is not deformed, distorted or moved by the pressure input. I was able to.
When the press-fit portion 10 moves, the push-up cylinder 37 is shrunk to provide a gap between the jack portion 50 and the top plate 70. As a result, despite the lightweight and compact press-fit portion 10, high-speed work is possible and a large press-fit can be generated.

The load cell 99 is attached to the pressing portion 58 at the lower end of the vertically moving flange 53 that moves up and down by the rotation of the screw 57 and the movable portion 533, the pickup portion 30 is suspended from the vertically moving flange 53 by the pipe-up guide 33, and the pickup portion by the pressure spring 52. The load cell 99 is configured so that a compressive force is always generated even if the weight of the upper jig 11 changes, and the load cell 99 measures only the compressive force. Measured pressure input with less error can be measured.
Also, by limiting the load cell 99 only to compression measurement, the strain amount of the strain generating body becomes minute and changes that do not reflect the insertion distance (stroke amount), so the insertion distance (stroke amount) is more accurate than before. ) Can be measured.

Since the compression force generated in the load cell 99 is reset to zero by the calculation reset unit 62 before the jack unit 50 starts pressing, the correlation between the pressure input and the insertion distance (stroke amount) is calculated. It became easy to express and became easier to control.

The calculation mode unit 61 detects a pressure input that increases as the insertion distance (stroke amount) advances, and a pressure input that decreases once the insertion distance (stroke amount) further advances, and then the insertion distance (stroke amount) advances. By judging the progress of the pressure input and making it possible to judge by several calculation methods so that the pressing force control unit 63 does not press more than necessary, the press-fit connector 20 is securely inserted, The substrate 80 can be mounted without damaging it.

An overall view of the connector press-fitting device of the present invention is shown in FIG. However, the top plate 70 is indicated by virtual lines. FIG. 1 is a view of the press-fit portion 10 as viewed from above with the cover removed. 2 and 3 depict a cross-section FF and a cross-section EE of the top view of the press-fitting portion 10 of FIG.
FIG. 4 is a view showing a state before the push-up cylinder 37 raises the push-up pin 38 to bring the jack plate convex portion 511 into contact with the top plate 70, fix it at the stop position, and start the press-fitting operation. A hatched portion indicates a portion lifted upward by the push-up cylinder 37.

  (1) in FIG. 5 is a diagram in which a portion where pressure is generated by the rotation of the screw 57 is indicated by oblique lines, and a load cell 99 is attached to the lower end. (2) in FIG. 5 is a portion that is lowered by the rotation of the screw 57, and a portion that is suspended from the vertically moving flange 53 is indicated by diagonal lines. A compression force is always applied to the load cell 99, and the pickup unit 30 A portion where the press-fit connector 20 is press-fitted by the upper jig 11 picked up at the lower end of the is shown.

  FIG. 7 shows a state in which the press-fit connector 20 is inserted into the board 80, and (1) to (3) in FIG. 8 show the state in which the terminal 21 is inserted into the through hole 81 step by step. Is. (1) to (4) in FIG. 9 are graphs showing the threshold values used as the determination criteria in the calculation mode 61. FIG. 10 shows a conventional press-fitting part, and FIG. 11 shows a conventional connector press-fitting device.

  The overall structure of the present invention will be described with reference to FIG. A control unit 60 for controlling the whole, a calculation mode unit 61, a calculation reset unit 62, and a pressing force control unit 63 are built in the cover of the main body 1, and the upper jigs 113 and 114 are picked up by the press-fitting unit 10 and predetermined. The press-fit connectors 203 and 204 are controlled so as to move and press-fit. The press-fit connector 203.204 has already been temporarily inserted into the board 80 in the upstream work process. The substrate 80 is installed at a predetermined position of the lower jig 12.

The movement of the press-fit portion 10 in the Y direction can be moved by the Y direction guide 14. Similarly, the movement in the X direction can be moved by the X direction guide 25. With these guides, the press-fit portion 10 is installed so that it can be moved within the work range between the pick-up position and the press-fit position of the upper jig 11 by the control of the control portion 60. The power for movement is moved by a motor or a cylinder built in the main body 1 and the X direction guide 25. (Power source not shown)

  The press-fitting unit 10 moves to a place where the upper jig 11 is placed, and picks up the upper jigs 113 to 114. As a pick-up method, there is a case in which a clamp 322 as shown in FIG. 3 is used in addition to adsorption by air or electromagnetic force. In this application, a pickup by a clamp is adopted. Since the pickup of the upper jig 11 by the clamp 322 is described in detail in Japanese Patent Application No. 2007-159971 filed by the same applicant as the present application, the description thereof will be omitted.

  In FIG. 6, the press-fit portion 10 that picks up the predetermined upper jig 11 (113, 114) moves immediately above the temporarily inserted press-fit connector 20 (203, 204) and stops, and lowers the upper jig 11 to lower the upper jig 11 ( The press-fit connector 20 (203, 204) suitable for 113, 114) is press-fitted. At this time, there is a fixed top plate 70 above the press-fitting portion 10 that moves so that the reaction force of the press-fitting portion 10 can be received. These operations are controlled by the control unit 60.

  The press-fitting portion 10 is configured as shown in FIGS. FIG. 1 is a top view of the press-fitting portion 10 of FIG. The circular shape from the center left plays the role of generating a pressing force by rotating the screw 57 of the jack portion 50 by the screw gear 571. The screw gear 571 is connected to the motor gear 552 by a belt 56, and a pressing force is generated by driving the motor 55. When viewed from above, a push-up cylinder 37 is installed between the screw gear 571 and the motor gear 552.

  FIG. 2 shows a state of the section FF in FIG. When the motor 55 is driven, the motor gear 552 is rotated, the screw gear 571 is also rotated by the belt 56, and the screw 57 is driven through the screw shaft portion 572 fixed to the screw gear 571. As the screw 57 rotates, the movable part 533 containing the ball screw moves up and down, and the vertical movement flange 53 integrated with the movable part 533 also moves up and down.

  The motor 55 has a built-in stroke measurement unit (rotary encoder) 551. By measuring the pulses output from the stroke measurement unit 551, it is possible to measure how much the motor 55 has rotated in which direction. Thus, the position of the vertical movement flange 53 in the Z direction can be determined.

  FIG. 3 shows a state of the cross section EE of FIG. The up-and-down moving flange 53 is moved up and down vertically by being guided by the first guide 54 together with the movable portion 533 that is moved up and down by the rotation of the screw 57. The pressing force generated when the vertically moving flange 53 is lowered is transmitted to the pressing unit 58 by the flange pin 532, and is transmitted to the load cell (pressing force measuring unit) 99 to measure the pressing force generated in the pickup unit 30. ing.

The mechanism of the push-up cylinder 37 will be described with reference to FIGS. The press-fit portion 10 is installed on the X direction guide 25 and moves in the X direction. The X direction guide 25 and the holding plate 36 are attached via an X direction guide roller 26.
The press-fitting portion 10 stopped at the press-fitting position extends the push-up cylinder 37 and pushes the push-up pin 38 before starting pressing. The push-up pin 38 pushes up the jack plate 51 and presses the jack plate convex portion 511 against the top plate 70, so that the holding plate 36 is fixed so as not to slightly move.

FIG. 4 shows the entire portion pushed up at this time in diagonal lines. By this action, the press-fit portion 10 is fixed between the X-direction guide 25 and the top plate 70 by the tension due to the extension of the push-up cylinder 37.
The distance by which the push-up cylinder 37 is pushed up is the gap e between the top plate 70 and the gap plate projection 511. The clearance between the jack plate 51 and the first guide nut 541 at the upper end of the first guide 54 is f, and f is larger than e (f> e). The convex portion 511 is configured to be in pressure contact with the top plate 70 without fail.

The second guide 33 suspended from the vertically moving flange 53 is guided through the holding plate guide portion 361, and the pickup portion 30 is also pushed up by the gap e. Both the first guide 54 and the second guide 33 are configured so as not to tilt when pressed. In reality, the gap e is a very small gap of about 0.5 to 2 mm.
After the state shown in FIG. 4 is reached and the holding plate 36 does not slightly move, the control unit 60 controls so that the motor 55 is driven and the press-fitting operation is started.

(1) of FIG. 5 is a diagram in which only the portion that is pressed and integrated with the vertically moving flange 53 is represented by hatching. The movable portion 533 is raised and lowered by the rotation of the screw 57. The movable part 533 moves up and down without using a ball bearing and smoothly shaking.
The vertically moving flange 53 integrated with the movable portion 533 is guided by the four first guides 54 and descends horizontally to generate a pressing force. The pressing force generated by the vertically moving flange 53 is transmitted to the pressing portion 58 via the flange pin 532 and measured by the load cell 99.

  (2) of FIG. 5 is a diagram in which only the portion suspended from the vertical movement flange 53 is represented by hatching. The pickup unit 30 is suspended from the vertically moving flange 53 via the four second guides 33. The second guide 33 penetrates the holding plate guide part 361 and is held horizontally. A crimp spring 52 is attached to the upper end of the second guide 33 and is always suspended so that a lifting tension is generated with respect to the vertical movement flange 53.

  The four second guides 33 are always lifted upward by the tension of the crimp spring 52 and serve to lift the pickup unit 30 upward. The lifting force with which the pickup unit 30 is pulled up is transmitted to the load cell 99 via the crimping bolt 59. By this action, the load cell 99 always generates a compressive force.

  The crimp spring 52 is strong enough to allow the crimp bolt 59 to be crimped to the load cell 99 even if the weight of the pick-up section 30 is changed and the weight is increased or decreased. Even if the upper jig 11 is replaced, the crimp spring 52 is crimped. The bolt 59 and the load cell 99 are configured to be always crimped.

With the above-described configuration, when the press-fitting portion 10 stops at the press-fitting position, the push-up cylinder 37 pushes up the portions other than the holding plate 36 and the four first guides 54 as shown in FIG. It is fixed to the plate 10 so that it does not move finely, and displacement at the time of pressing is prevented.
When the insertion operation is completed, the motor 55 rotates reversely under the control of the control unit 60 to raise the vertical movement flange 53 to the set position, and then the push-up cylinder 37 is contracted to retract the top plate 70 and the jack plate projection 511. There is a gap e between them. The press-fitting portion 10 can move within the working range at high speed without being affected by the top plate 70.

  The load cell 99 attached to the tip of the pressing portion 58 is subjected to a compressive force regardless of the weight of the upper jig 11 due to the tension of the crimp spring 52, and the load cell 99 measures strain generated only in the compression direction. The error in measuring the pressing force can be reduced.

  Since the deformation amount due to the compressive force of the load cell 99 is very small, an error in the insertion distance (stroke amount) can be reduced. Therefore, even if the actual insertion distance (stroke amount) of the pickup unit 30 is not measured, the insertion distance (stroke amount) of the pickup unit 30 is measured by the stroke measurement unit (rotary encoder) 551 attached to the motor 55. It can be controlled without any problems.

Next, as shown in FIG. 9, a configuration for controlling the pressing force using the correlation between the insertion distance (stroke amount) and the pressure input will be described. A graph showing the relationship between the pressing force measured by the load cell (pressing force measuring unit) 99 and the insertion distance (stroke amount) measured by the stroke measuring unit (rotary encoder) 551 is shown as (1) in Fig. 9. The

a is a standard graph, and b and c are graphs when an error occurs. The compression force generated by the lifting force of the crimp spring 52 on the load cell 99 before the pickup unit 30 is lowered is reset by the calculation reset unit 62 and set to a no-load state, and then the measured pressure input is set by the calculation mode unit 61. Calculation is performed to create a graph such as a in (1) of FIG.
The graph can be displayed by the display unit 64.

The process at the time of insertion is demonstrated using the graph of a and (1)-(3) of FIG. The state of (1) in FIG. 8 corresponds to point o in the graph of a. Although some pressure input is generated due to mechanical loss, the pressure input moves horizontally even if the insertion distance (stroke amount) proceeds.
The pressure input at this time indicates a value obtained by dividing the pressure input measured by the load cell 99 by the number of terminals 21. In actual data collection, the pressure and insertion distance (stroke amount) are measured every 0.2 seconds and transmitted to the calculation mode unit 61.

The state of (2) in FIG. 8 shows from point o to point p in the graph of a. Since the bulging portion 22 of the terminal 21 is made wider than the through hole 81, the bulging portion 22 is compressed in the direction of the through hole 23 and plastically deformed. The bulging portion 22 when plastically deformed is deformed by a large force, but after plastic deformation, it is inserted into the wall plating layer 811 of the through hole 81 while resisting the repulsive force generated by the springback, so the insertion distance Although the pressure increases, the pressure input temporarily decreases.
This state is a state from point p to point q in the graph of a.

The state of (3) in FIG. 8 corresponds to the point q in the graph of a. The press-fit connector convex portion 211 is in contact with the substrate 80 and cannot be inserted any more. If the pip-up unit 30 continues to be pressed as it is, the pressure input rises again, and the state is changed from the point q to the point r in the graph of a.

If the insertion distance (stroke amount) is constant, control of the pressing force control unit 63 when it is determined that the tip of the upper jig 11 has reached the position of the insertion distance Z as shown in FIG. 9 (1). Thus, the pressing is stopped, the insertion operation is finished, and the vertically moving flange 53 is raised.
However, there may be a graph of b due to an error in manufacturing accuracy of the terminal 21 or the through hole 81. For the reasons described above, the waveform of the graph due to the change in pressure input is almost similar. However, when the insertion is performed in the state of the graph b, if the pressing is stopped at the insertion distance Z, the press-fit connector 20 is not completely attached.
In this state, it is assumed that a failure occurs due to poor energization.

Similarly, if the pressing is continued to the position of the insertion distance Z in the state of the graph c, the press-fit connector convex portion 211 comes into contact with the substrate 80, presses the substrate 80, and overlaps the layers 80. Internal printed wiring may be damaged.
It is desirable that the insertion operation of the press-fit connector 20 is recognized as soon as possible when the state of (3) in FIG. 8 is reached, the pressing is stopped, the insertion operation is terminated, and the vertical movement flange 53 is raised.

The control method (2) in FIG. 9 is considered so as not to cause the above-described problems. When the specified pressure v is reached within the preset insertion distances Z3 to Z4, the pressing control unit 63 controls the pressing force to stop the insertion work. This control method is suitable when the pressure input error in the set zone Z3 to Z4 is small.

Further considered is the control method (3) in FIG. Differentiating the curve of the graph within the preset insertion distance Z5 to Z6, a linear approximation formula (such as y = ax + b) is obtained by the calculation mode unit 61, and the angle of the linear approximation formula is θ When this happens, the pressing force control unit 63 controls the pressing to stop the insertion operation.
With this method, it is possible to determine when the linear approximation formula has risen within the insertion distance Z5 to Z6, so that pressure control over a wide range is possible. Therefore, it is suitable when there are many variations in the press-fitting distance direction.

Further, as the control method of (4) in FIG. 9, the calculation mode unit 61 obtains the average pressure input w when the pressure input falls within the preset insertion distance M1 to M2, and then inputs the pressure to the average pressure w. When the pressure reaches, the pressing force control unit 63 controls the pressing to stop the pressing operation.
This is a method in which the pressure input is measured and the average pressure input w is set and controlled, which is suitable when there is a large variation in the graph in the pressure input direction.

By the method of inserting and mounting the press-fit connector 20 on the substrate 80 by the control method of the insertion algorithm as described above, the problems can be greatly reduced.

The above graph shows an abnormal waveform when the terminal 20 is bent when the press-fit connector 20 is installed, or when the through hole 81 is not punched. You can also deal with the situation.

Although the present invention must work at high speed, the press-fit portion 10 must be manufactured with a large and strong pressure input. Further, the press-fit connector 20 that must be correctly inserted despite an error is a solution to these contradictory problems.

The present invention can be applied not only to press-fit devices for press-fit connectors but also to press devices that perform press work with several types of jigs.

It is a top view of a press fit part. It is the front view which looked at the press fit part from section FF. It is the side view which looked at the press fit part from section EE. It is the front view seen from the cross section FF when the whole press-fitting part is pressed against the top plate, and the side view seen from the cross section EE. In particular, the portion that is pushed up and moved by the push-up cylinder is hatched. It is a side view seen from the cross-section EE when the entire press-fitted part is pressed against the top plate. (1) is the part where the direct pressure input is transmitted by the screw 57, and (2) is moved up and down. The portion that is suspended from the flange and is always compressed by the load cell is shaded. It is a perspective view of the whole connector press-fitting device of the present invention. It is the figure which showed the state of the assembly of a press fit connector and a board | substrate. It is the figure which showed the state in which the terminal of a press fit connector is inserted in a through hole in steps. It is the graph described so that insertion distance (stroke amount) and pressure input might be correlated. It is a figure of the conventional press fit part. It is a figure of the conventional connector press-fitting device.

Explanation of symbols

1
Body
Ten
Press-in part
11
Upper jig
113
Upper jig (installed on the main body)
114
Upper jig (installed on the main body)
12
Lower jig
14 Y direction guide
20 Press-fit connector
201 Press-fit connector (inserted on board)
202 Press-fit connector (inserted on board)
203 Press-fit connector (temporarily inserted into the board)
204 Press-fit connector (temporarily inserted into the board)
21 terminals
211 Press-fit connector protrusion
22 bulge
23 Through hole
25 X direction guide
26 X direction guide roller
30 Pickup section
31 Press plate for pickup
32 Clamp plate
322 Clamp
33 Second Guide
36 Retaining plate
37 Push-up cylinder
38 Push-up pin
50 Jack section
51 Jack plate
511 Jack plate convex
52 Crimp spring
53 Vertical flange
532 Flange pin
533 moving parts
54 First Guide
541 First guide nut
55 Motor
551 Stroke measurement unit (rotary encoder)
552 motor gear
56 Belt
57 screws
571 screw gear
572 Screw shaft
58 Pressing part
59 Crimp bolt
60 Control unit
61 Calculation mode section
62 Operation reset section
63 Pressure control unit
64 Display
70 Top plate
80 substrates
81 Through hole
811 Wall plating
90 table (conventional connector press-fitting device)
91 Upper jig (for conventional non-moving press-fit parts)
92 Press-fit part (conventional non-moving type)
922 Conventional body
94 Gyacase (conventional)
95 screw (conventional)
96 Slide part (conventional)
97 Holding part (conventional)
98 Upper jig (for conventional moving press-fit parts)
99 Load cell (Pressure measurement unit)
100 Press-fit part (conventional type)

Claims (6)

A pick-up part having a work range between the pick-up position and the press-fitting position of the upper jig, and a press-fitting connector temporarily inserted into the board by pressing the upper jig at the press-fitting position by the jack part are press-fitted into the board. In the press-fitting device to
A holding plate provided with moving means for moving the pickup section within the working range;
A top plate provided above the jack portion that receives a reaction force when the jack portion is pressed at the press-fitting position;
A first guide fixed to the holding plate and vertically moving the jack portion;
A push-up cylinder for fixing the jack portion in a press-fit position by pressing the upper portion of the jack portion and the lower portion of the top plate;
The jack portion is press-fixed to the top plate, and when the upper jig is pressed by pressing the pickup portion to press-fit the connector into the substrate, the press reaction force is supported by the top plate. A connector press-fitting device characterized by being made. The jack part is a movable part that moves up and down;
A vertically moving flange that moves up and down as the movable part moves up and down;
A pressing force measuring means for measuring the pressing force of the jack portion attached to the lower end of the vertical movement flange;
A pickup plate pressing plate for transmitting the pressing force to the pickup unit via the pressing force measuring unit;
A crimping spring for constantly pressing the pressing plate for the pickup section to the vertical movement flange;
The connector press-fitting device according to claim 1, further comprising: The jack part is a stroke measuring part for measuring a movement distance in the press-fitting direction of the pickup part,
An arithmetic reset unit that resets the measurement value of the pressing force measuring means at the start of pressing the jack unit,
3. The pressing force control unit that controls the pressing force of the jack unit based on the pressing force and the stroke amount measured by the pressing force measuring unit and the stroke measuring unit. Connector press-fitting device. When the stroke amount measured by the stroke measuring unit increases and the increased pressing force once decreases and the pressing force increases again to reach a set pressing value,
4. The connector press-fitting device according to claim 3, wherein the press-fitting operation of the pickup unit is controlled to be stopped and finished. A linear approximation formula is obtained for a pressure change when the stroke amount measured by the stroke measuring unit increases and the pressure force that has risen once drops and the pressure force rises again, and the rising angle of the linear approximation formula is When the set angle is reached,
4. The connector press-fitting device according to claim 3, wherein the press-fitting operation of the pickup unit is controlled to be stopped and finished. The average value in the designated stroke when the stroke amount measured by the stroke measuring unit increases and the pressure force that has risen once falls, and the pressure force rises again and the average value in the designated stroke is calculated. When we reach
4. The connector press-fitting device according to claim 3, wherein the press-fitting operation of the pickup unit is controlled to be stopped and finished.

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