JPH11340689A - Component mounting device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a component mounting apparatus capable of detecting a suction nozzle abnormality at an arbitrary interval without stopping the apparatus. A component supply unit that supplies a component, and a component mounting unit that positions a mounting target at a component mounting position.
The suction nozzle 5 is mounted so as to be able to move up and down and is rotated intermittently, so that the component suction at the component supply position A of the component supply unit 2 and the component mounting at the component mounting position B of the component mounting unit 4 are repeatedly performed. In the component mounting apparatus provided with the head 6, a flow rate measuring unit 7 for measuring the air flow rate of the suction nozzle 5 by the flow meter 12 is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a component mounting apparatus which suctions and holds various components such as electronic components by a suction nozzle and automatically mounts them at predetermined positions on various mounting objects such as a printed circuit board.

[0002]

2. Description of the Related Art In an electronic component mounting apparatus for manufacturing an electronic circuit board, when a large number of electronic components are repeatedly suctioned and mounted by a suction nozzle, foreign matter enters or clogs in the suction nozzle, or the pipes may be clogged. Air leaks may cause poor suction or inability to suck electronic components.

As a conventional electronic component mounting apparatus which copes with this, there is known an apparatus disclosed in Japanese Patent Application Laid-Open No. 4-177896. As shown in FIG. 8, the electronic component mounting apparatus includes a component supply unit 31 having component supply means 33 for supplying electronic components on a moving table 32, and a component mounting unit for positioning a printed circuit board 34 on which electronic components are mounted. Part 3
5 and a rotary head 38 for moving a transfer head 37 equipped with a suction nozzle 36 for suctioning and holding an electronic component at a component supply position of the component supply unit 31 and mounting the electronic component at a predetermined position on a printed circuit board 34 on a circumference. In the provided electronic component mounting device, a detection device 40 that measures nozzle pressure is mounted on a moving table 32 of the component supply unit 31.

As shown in FIG. 9, the detecting device 40 includes a pedestal 41 installed on a moving table 32, and a space 42 is formed in a front portion thereof.
Are arranged. The seat 43 has a hole 44 and a pressure sensor 46 provided on the base 41 through a tube 45.
It is connected to the. Reference numeral 47 denotes a cushion spring material for elastically supporting the seat body 43. Reference numeral 48 denotes a pneumatic device, which is connected to the suction nozzle 36 via a tube 49. When the suction nozzle 36 sucks the electronic component, the suction nozzle 36 sucks the vacuum, and when the electronic component is mounted, it blows out the air.

When measuring the air pressure of the suction nozzle 36, the feed screw 39 of the moving table 32 is driven to move the moving table 32, and the seat 43 is stopped at the suction position A. Next, the suction nozzle 36 is lowered to bring its lower end into close contact with the seating body 43, and air is blown out or vacuum sucked from the air pressure device 48, and the air pressure is detected by the pressure sensor 4.
6, the clogging of the suction nozzle 36 is detected.
If the suction nozzle 36 is clogged, the suction nozzle 36 is replaced or maintained.

[0006]

However, in the above-mentioned conventional configuration, the clogging of the suction nozzle 36 is detected by air pressure. However, the final arrival air pressure when clogging or the like occurs and the air in a normal state. The difference with pressure is small,
There was a problem that there were many judgment errors.

The state of the suction nozzle 36 is checked only when the power of the apparatus is turned on and when an operator performs a key operation for checking the state of the suction nozzle 36. For this reason, it is necessary for the operator to always be careful during the operation of the apparatus and to judge the acceptability of the suction nozzle 36 in a timely manner in order to find out the abnormality of the suction nozzle 36 at which time it occurs, which is troublesome. there were.

Further, if the pass / fail judgment operation is frequently performed, production during that time is interrupted and the judgment operation is often wasted, and the operation rate of the apparatus is reduced. When the detection is delayed and a foreign substance enters or becomes clogged in the suction nozzle 36, a failure of the printed circuit board 34 due to poor suction of the electronic component or inability to suck the electronic component occurs. However, there is a problem that the yield of electronic components and printed circuit boards is reduced, and the productivity is reduced due to the stoppage of the apparatus including the trouble recovery time.

Further, since the detection device 40 is disposed in the component supply unit 31 and can be moved only in the horizontal direction, the suction nozzle 3
When a plurality of the nozzles 6 are provided, the vertical position cannot be corrected for the variation in the center position of each of the suction nozzles 36, so that the suction nozzle 36 and the seat 43 are displaced from each other, and the measurement can be performed correctly. However, there is a problem that the normal suction nozzle 36 may be determined to be abnormal.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and can detect an abnormality of a suction nozzle at an arbitrary interval without causing a determination error and without stopping the apparatus. It is an object of the present invention to provide a component mounting apparatus capable of taking measures and automatically determining whether or not the nozzle is defective or not, and automatically replacing a defective nozzle.

[0011]

A component mounting apparatus according to the present invention is provided with a component supply unit for supplying components, a component mounting unit for positioning a mounting target at a component mounting position, and a suction nozzle capable of moving up and down. In the component mounting device, which intermittently rotates and repeatedly mounts the component at the component supply position of the component supply unit and mounts the component at the component mounting position of the component mounting unit, the flowmeter measures the suction nozzle. It is equipped with a flow rate measurement unit that measures the air flow rate, and can accurately detect various defects of the suction nozzle due to entry of foreign matter into the suction nozzle, clogging, and air leaks in the piping route, etc. It is possible to prevent a decrease in the yield of the component and the mounting object due to the inability to be sucked, to reduce a time loss including a recovery measure time when a trouble occurs, and to improve productivity.

Further, by providing a flow rate measuring section at a position where the suction nozzle temporarily stops during a range in which the suction nozzle moves from the component mounting position to the component supply position, the suction nozzle is moved intermittently by the mounting head to move the suction nozzle to the component supply position. When the suction nozzle pauses at the flow rate measurement unit after component mounting during the mounting operation that repeatedly intermittently moves between and the component mounting position and mounts the component to the mounting target, the air flow rate of the suction nozzle is Measurement can be performed, and measures such as finding various defects of suction nozzles and replacing defective nozzles or recovering abnormalities can be taken at an early stage, and the yield of components and mounting objects decreases due to poor suction or inability to suction components. In addition, it is possible to reduce a time loss including a recovery time when a trouble occurs, thereby improving productivity.

Further, even if a flow rate measuring section is provided in the component mounting section for holding and moving the mounting object in the X and Y directions, the air flow rate of the suction nozzle can be measured during the mounting operation without interrupting the component mounting operation. The same effect can be achieved by performing the above operation, and even if there is a variation in the center position of a plurality of suction nozzles, a correction value is individually set for the variation and the component mounting portion is suctioned by the correction value. By correcting the position for each nozzle, it is possible to prevent measurement errors due to air leaks in the flow rate measurement unit, and eliminate errors in the quality judgment.

[0014] Further, if a control unit for judging pass / fail by comparing the air flow rate of the suction nozzle measured by the flow meter with a reference air flow rate registered in advance is provided, the pass / fail judgment can be made automatically. Can be determined more quickly than in the case of the determination, no special time is required in addition to the normal mounting operation of the components, and there is no omission or error in the quality determination operation.

Further, when a plurality of suction nozzles are provided and a reference air flow rate corresponding to each suction nozzle is set,
It is possible to provide a range of quality judgment criteria for variations due to the processing and assembly of the suction nozzle, so that there is no mistake in quality judgment.

Further, at least one of the number of component mounting points, the number of component suction points, the production amount, and the operation time is registered in advance, and the air flow rate of the suction nozzle is measured at each registration interval. It is no longer necessary for an operator to make a pass / fail judgment by key operation, and the pass / fail judgment can be performed at appropriate intervals in accordance with production conditions. It is possible to prevent the occurrence of a failure due to a suction failure or a mounting failure due to a delay in finding an abnormality due to not performing the determination for a long time, and to prevent a decrease in yield.

If the control unit determines that the measured suction nozzle is in a defective position at a position where the suction nozzle temporarily stops during the range of movement of the suction nozzle from the flow rate measurement unit to the component supply unit, the failure is determined. If a nozzle replacement unit that automatically replaces a suction nozzle that has been determined to be a new suction nozzle is provided, the defective suction nozzle can be quickly and reliably replaced before the next component suction operation, and normal component mounting is performed. The component can be reliably sucked and mounted by the appropriate suction nozzle at the component supply position without requiring a special time for the cycle.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An electronic component mounting apparatus according to one embodiment of the present invention will be described below with reference to FIGS. The electronic component mounting apparatus according to the present embodiment mounts electronic components at predetermined positions on a printed circuit board to manufacture an electronic circuit board, as shown in FIG. 1, but the present invention is not limited to this. Instead, the present invention is applied to various component mounting apparatuses that mount various components on various mounting objects.

As shown in FIG. 1, the electronic component mounting apparatus according to the present embodiment includes a component supply unit 2 for supplying an electronic component 1 and a printed board 3 on which the electronic component 1 is to be mounted. B, and a mounting head 6 equipped with a suction nozzle 5 capable of moving up and down and intermittently rotating to repeatedly move circumferentially between a component supply position A and a component mounting position B. ing. The mounting head 6
While controlling the suction nozzle 5 to a required height in accordance with the movement position, the suction of the electronic component 1 at the component supply position A and the mounting of the electronic component 1 at the component mounting position B are performed. To move the suction nozzle 5 downward for measurement of the air flow rate.

The component supply unit 2 stores various electronic components 1 and, if necessary, supplies a component supply cassette 8 for supplying the stored electronic components 1 in accordance with the type and number of necessary electronic components 1. A plurality of component supply cassettes 8 each containing the necessary electronic components 1 are moved to a component supply position A corresponding to, for example, P1 among the respective stop positions P1 to P10 of the suction nozzle 5 shown in FIG. The necessary electronic components 1 are supplied each time.

The component mounting section 4 is mounted on a suction nozzle 5 at a component mounting position B set at, for example, a stop position P6 shown in FIG. 2 so that a predetermined electronic component 1 can be mounted at a predetermined position on the printed circuit board 3. An XY table 9 is provided that moves in the XY2 directions orthogonal to each other when viewed from above, such that predetermined component mounting positions face each other.

The mounting head 6 includes a rotating body 6 that is intermittently rotated.
Nozzle unit 1 having suction nozzle 5 around a
The cam followers 10a of the nozzle units 10 are provided around the rotary body 6a so as to be able to move up and down at equal intervals on the circumference corresponding to each of the stop positions P1 to P10 shown in FIG. By engaging with the cam groove 11a of the cam 11, each of the nozzle units 10 is controlled to have a required height at each rotational position due to the intermittent rotation of the rotating body 6a. Position A
Of the electronic component 1 at the position and the electronic component 1 at the component mounting position B
The suction nozzle 5 is attached to each nozzle unit 10
The electronic component 1 can be moved down or rotated to correct the rotational position of the sucked electronic component 1.

The flow rate measuring section 7 is disposed at a stop position P7 shown in FIG. 4, for example, in which the suction nozzles 5 temporarily stop during a range from the component mounting position B of the suction nozzle 5 to the component supply position A. The flow meter 12 is configured to measure the air flow rate of the suction nozzle 5. In addition, data of the air flow rate of the suction nozzle 5 measured by the flow meter 12 is taken into the control unit 13, and is compared with a reference air flow rate registered in advance by the control unit 13 to determine pass / fail. If it is determined to be defective, it is displayed on the operation screen 14,
The workers are informed.

In this embodiment, when the suction nozzle 5 mounted on the mounting head 6 is defective at each of the two stop positions P8 and P9 shown in FIG. A nozzle replacement unit 15 for replacement is provided. The nozzle replacement unit 15 includes a nozzle receiving table 16 and a nozzle supply table 17 for supplying a new suction nozzle 5.

Next, with reference to FIG.
The structure of will be described. The flow rate measuring unit 7 is provided with a measurement block 18 at a position facing the suction nozzle 5, a space portion 19 that opens upward in the measurement block 18, and a sealing material 20 is attached around the space portion 19. Further, a hole 21 communicating with the space 19 is formed in the measurement block 18, and is connected to the flow meter 12 through a tube 22.

The suction nozzle 5 temporarily stopped on the flow rate measuring unit 7 is moved down on the nozzle unit 10, and the tip of the suction nozzle 5 enters the space 19 provided in the measurement block 18, The flange portion 5a and the sealing material 20 come into close contact with each other to form a sealed state in the space portion 19, and the suction flow rate or the blow flow rate of the suction nozzle 5 is measured by the flow meter 12.

In the present embodiment, an example in which the suction nozzle 5 is moved downward for measurement is shown. However, the entire flow rate measuring unit 7 or the measurement block 18 may be moved upward for measurement.
May move downward, and the entire flow measuring unit 7 or the measuring block 18 may move upward for measurement. The flange 5 a of the suction nozzle 5 and the sealing material 20 of the measuring block 18 are tightly closed to the space 19. It only has to be a state.

In this embodiment, the flow rate measuring unit 7 is provided only at the position P7 where the suction nozzle 5 is temporarily stopped, and the suction flow rate and the blow flow rate are measured.
The suction nozzles 5 during the range of moving from the component mounting position B to the component supply position A are sequentially temporarily stopped. For example, the flow rate measuring units 7 are provided at two positions of stop positions P7 and P8 shown in FIG.
For example, the suction flow rate of the suction nozzle 5 may be measured by the flow rate measurement unit 7 provided at the stop position P7, and the blow flow rate of the suction nozzle 5 may be measured by the flow rate measurement unit 7 provided at the stop position P8.

FIG. 4A shows the result measured by the flow rate measuring section 7 of this embodiment. In the case where the air pressure is measured as in the conventional example, as shown in FIG. 4B, the difference between the final arrival air pressures is small and a determination error is likely to occur.
As is clear from (a), the normal nozzle and the abnormal nozzle have different final arrival flow rates, and thus can be correctly determined.

Next, a series of operations of the electronic component mounting apparatus according to the present embodiment will be described with reference to a flowchart shown in FIG. 5. After power is turned on, production is started after necessary initial work is completed. The process starts (step # 1), and the suction and mounting of the electronic component 1 by the suction nozzle 5 is sequentially performed by the plurality of nozzle units 10 (steps # 2 and # 3). 1
The air flow rate of the suction nozzle 5 attached to the zero is measured by the flow rate measurement unit 7 (Step # 4), and the measured value is taken into the control unit 13 and compared with a reference air flow rate registered in advance. Then, the quality of the suction nozzle 5 is determined (step # 5).

Only when this determination is defective, the nozzle is replaced with a new suction nozzle 5 by the nozzle replacing unit 15 (step # 6). next,
It is determined whether or not a trouble has occurred in nozzle replacement or the like (step # 7). If no trouble has occurred, the operations following the component suction are repeated again. If a trouble occurs, the apparatus is stopped (step # 8), and other processing is performed (step # 9), and the operations after component picking-up are repeated again.

Further, in the example of FIG. 5, the nozzle replacement unit 15 immediately replaces the suction nozzle 5 with a new suction nozzle 5 when the quality of the suction nozzle 5 is determined to be defective. However, as shown in the flowchart of FIG. If it is the first time that the nozzle is determined to be defective, the suction nozzle 5 is not replaced by the nozzle replacement unit 15 and the steps # 2 and # 3 are jumped to skip the suction operation at the component supply position A. Without performing the component mounting operation at the component mounting position B, the air flow rate of the suction nozzle 5 is measured again by the flow rate measuring unit 7 in steps # 4 and # 5, The cycle of determining good or bad may be repeated (step # 10), and the nozzle replacement unit 15 may replace the suction nozzle 5 with a new suction nozzle 5 only when the failure is determined two or more times in succession.

In the above description, during the normal mounting cycle of the electronic component 1 by the suction nozzle 5, every time the mounting of the electronic component 1 is completed, the air flow rate of the suction nozzle 5 is measured by the flow rate measuring unit 7, Although the example of performing the pass / fail judgment by the control unit 13 has been described, the number of sucked electronic components is counted, and the air flow rate of the suction nozzle 5 is sent to the flow rate measurement unit 7 every time the number reaches a preset value. May be determined by the control unit 13, and the number of suction parts, the number of mounted parts,
Either the number of printed circuit boards produced or the machine operating time
The timing at which the flow rate of the air flow rate of the suction nozzle 5 is measured by the flow rate measurement unit 7 may be determined by using one or two or more of them.

When a suction error has occurred, the flow rate of the air from the suction nozzle 5 may be measured by the flow rate measuring unit 7 and the control unit 13 may determine whether the air flow is good or bad.

Next, another embodiment of the present invention will be described with reference to FIG. In the present embodiment, a component mounting apparatus in which a flow rate measuring unit 7 that measures an air flow rate of a suction nozzle 5 by a flow meter 12 is provided on a component mounting unit 4 that holds the printed board 3 and moves the XY direction 2 is shown.

The center position data of the space 19 of the measuring block 18 in the flow measuring unit 7 provided in the component mounting unit 4 is registered in advance, and the component mounting unit 4 is moved in the XY2 directions based on the data. The flow measuring unit 7 is moved below the component mounting position B set to, for example, P6 among the respective stop positions P1 to P10 of the suction nozzle 5 shown in FIG. And
The suction nozzle 5 is moved down in the same manner as when the electronic component 1 is mounted on the printed circuit board 3, and the flange 5 a of the suction nozzle 5 and the sealing material 20 are brought into close contact with each other, and a sealed state is created in the space 19. The suction flow rate and the blow flow rate of No. 5 are measured by the flow meter 12. At this time, correction values are individually set in advance for variations in the center position of the plurality of suction nozzles 5, and the component mounting unit 4 is moved in the XY2 directions by the correction values.
The center of the suction nozzle 5 and the center of the space 19 of the measurement block 18 in the flow measurement unit 7 can be aligned.

In the present embodiment, an example is shown in which the suction nozzle 5 is moved downward for measurement. However, the entire flow rate measuring unit 7 or the measurement block 18 may be moved upward. Flow rate measuring unit 7 or measuring block 18
May move upward, and the flange 5a of the suction nozzle 5 and the sealing material 20 of the measurement block 18 may come into close contact with each other to measure the space 1
It is sufficient that a sealed state is created in 9.

[0038]

According to the component mounting apparatus of the present invention, since the flow rate measuring unit for measuring the air flow rate of the suction nozzle by the flow meter is provided, foreign matter enters the suction nozzle, clogs, and air leaks in the piping route. Various failures of the suction nozzle due to such factors can be reliably detected, preventing a decrease in the yield of components and mounting objects due to poor suction or inability to suction components, and reducing time loss including recovery time when trouble occurs. And productivity can be improved.

Further, if a flow rate measuring unit is provided at a position where the suction nozzle temporarily stops during a range in which the suction nozzle moves from the component mounting position to the component supply position, during the component mounting operation,
The suction nozzle measures the air flow rate of the suction nozzle after mounting the component, and can detect various failures of the suction nozzle, and can quickly take measures such as replacing the defective nozzle or recovering from abnormalities. It is possible to improve the productivity by lowering the yield of the component and the mounting object due to the suction failure or the suction failure, and reducing the time loss including the time required for recovery measures when a trouble occurs.

If a flow rate measuring section is provided in the component mounting section for holding and moving the mounting object in the X and Y directions, the air flow rate of the suction nozzle is measured during the mounting operation without interrupting the component mounting operation. In addition to achieving the same effect, even if there is a variation in the center position of a plurality of suction nozzles, a correction value is individually set for the variation, and the component mounting portion is set to the suction nozzle by the correction value. By correcting the position every time, it is possible to prevent a measurement error due to an air leak in the flow rate measuring unit and eliminate an error in the quality judgment.

Further, if a control unit for judging pass / fail by comparing the air flow rate of the suction nozzle measured by the flow meter with a reference air flow rate registered in advance is provided, the pass / fail judgment can be made automatically. Can be determined more quickly than in the case of the determination, no special time is required in addition to the normal mounting operation of the components, and there is no omission or error in the quality determination operation.

Further, when a plurality of suction nozzles are provided and a reference air flow rate corresponding to each suction nozzle is set,
It is possible to provide a range of quality judgment criteria for variations due to the processing and assembly of the suction nozzle, so that there is no mistake in quality judgment.

If at least one of the number of component mounting points, the number of component suction points, the production amount, and the operation time is registered in advance, and the air flow rate of the suction nozzle is measured at each registration interval, the apparatus can be operated during operation. It is no longer necessary for the operator to make a pass / fail judgment by key operation, and the pass / fail judgment can be made at appropriate intervals in accordance with production conditions. It is possible to prevent the occurrence of a failure due to a suction failure or a mounting failure due to a delay in finding an abnormality due to not performing the determination for a long time, and to prevent a decrease in yield.

In the case where the determination of the measured suction nozzle by the control unit is not good at the position where the suction nozzle temporarily stops during the movement range of the suction nozzle from the flow rate measuring unit to the component supply unit, the fault is detected. If a nozzle replacement unit that automatically replaces a suction nozzle that has been determined to be a new suction nozzle is provided, the defective suction nozzle can be quickly and reliably replaced before the next component suction operation, and normal component mounting is performed. The component can be reliably sucked and mounted by the appropriate suction nozzle at the component supply position without requiring a special time for the cycle.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a schematic configuration of an embodiment of a component mounting apparatus according to the present invention.

FIG. 2 is a layout diagram of components around a mounting head in the embodiment.

FIG. 3 is a cross-sectional view of a flow measurement unit according to the first embodiment.

4A and 4B show measurement data in the same embodiment and a conventional example in comparison, FIG. 4A is an explanatory diagram of flow rate measurement data in the present embodiment, and FIG. 4B is an explanatory diagram of pressure measurement data in a conventional example.

FIG. 5 is an operation flowchart in the embodiment.

FIG. 6 is another operation flowchart in the embodiment.

FIG. 7 is a perspective view showing a schematic configuration of another embodiment of the component mounting apparatus of the present invention.

FIG. 8 is a plan view showing a schematic configuration of a conventional electronic component mounting apparatus.

FIG. 9 is a sectional view of a pressure measuring unit in the conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electronic component (component) 2 Component supply part 3 Printed circuit board (mounting object) 4 Component mounting part 5 Suction nozzle 6 Mounting head 7 Flow rate measuring part 12 Flow meter 13 Control part 15 Nozzle replacement part A Component supply position B Component mounting position

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Minoru Yamamoto 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd.

Claims (7)

[Claims] 1. A component supply unit for supplying components, a component mounting unit for positioning a mounting target at a component mounting position, and a suction nozzle equipped so as to be able to move up and down and intermittently rotated to supply components at the component supply unit. In a component mounting device that has a mounting head that repeatedly performs component suction at a position and component mounting at a component mounting position of the component mounting unit, a flow rate measuring unit that measures an air flow rate of a suction nozzle with a flow meter is provided. A component mounting device characterized by the following. 2. The component mounting apparatus according to claim 1, wherein a flow rate measuring unit is provided at a position where the suction nozzle temporarily stops during a range in which the suction nozzle moves from the component mounting position to the component supply position. 3. The component mounting apparatus according to claim 1, wherein a flow measuring unit is provided in the component mounting unit that holds the mounting object and moves the object in the X and Y directions. 4. The control device according to claim 1, further comprising a control unit for comparing the air flow rate of the suction nozzle measured by the flow meter with a reference air flow rate registered in advance to determine the quality. The component mounting apparatus according to any one of the above. 5. The component mounting apparatus according to claim 4, comprising a plurality of suction nozzles, and a reference air flow rate corresponding to each of the suction nozzles is set. 6. The apparatus according to claim 1, wherein at least one of a component mounting point, a component suction point, a production amount, and an operation time is registered in advance, and an air flow rate of the suction nozzle is measured at each registration interval. The component mounting device according to claim 1. 7. A position where the suction nozzle temporarily stops during a movement range of the suction nozzle from the flow rate measurement unit to the component supply unit.
5. A nozzle replacement unit for automatically replacing a suction nozzle determined to be defective with a new suction nozzle when the determination of the measured suction nozzle by the control unit is defective. Or the component mounting apparatus according to 5.