JP3874280B2 - Vibrating parts feeder design method, vibrating parts feeder, and parts conveying apparatus using the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vibratory part feeder, particularly a vibratory part feeder used for supplying chip parts and the like that require high supply position accuracy, a design method thereof, and a component conveying apparatus using the vibratory part feeder.
[0002]
[Prior art]
Conventionally, for chip components such as multilayer capacitors and multilayer inductors, when performing characteristic defect inspection and appearance inspection before shipment, it is necessary to accurately supply the chip components to predetermined positions. As a device for this purpose, a vibration in a certain direction is generated in the component passage by applying vibration to the component passage for transferring the chip component at an excitation frequency of 50-60 Hz or 100-120 Hz from the vibration source. In general, vibration-type parts feeders that supply chip components in a certain direction by this vibration are widely used.
[0003]
Examples of the vibration type parts feeder include the following. That is, a spiral track is formed on the inner peripheral wall, a bowl-shaped bowl that discharges components along the track, and a horizontal passage that communicates with the discharge end of the bowl and corresponds to the component passage of the present invention. It is a vibration type parts feeder provided with a trough (part passage) to perform and a vibration source for applying linear vibration to the trough. The vibration source and trough are attached by a pair of front and rear inclined leaf springs, and the vibration source and base block (base) are attached by another pair of front and rear inclined leaf springs, and the base block is attached to the base. It is directly fixed (see Patent Document 1).
[0004]
In addition, there is a type in which a flexure vibrator is attached to a tray as a vibration source, the vibration source is supported and fixed on a bed (base), and the bed is held on a base via a coil spring (vibration suppression spring) ( Patent Document 2).
[0005]
With these vibration type parts feeders, with the miniaturization of the chip parts that are the supplies, higher supply accuracy has been required for delivery from the component supply port to the next process, etc. The demand is getting stronger. At the same time, there is a strong demand to supply at a higher speed.
[0006]
[Patent Document 1]
Japanese Patent Laid-Open No. 9-75846 [Patent Document 2]
Japanese Patent Application Laid-Open No. 5-246526
[Problems to be solved by the invention]
A vibration-type parts feeder in which a vibration source as disclosed in Patent Document 1 is supported via a leaf spring can sufficiently exhibit its inherent component supply capability when mounted on a strong surface plate. However, when it is mounted on a metal frame used in an actual process, the frame is vibrated greatly when vibration from the vibration source is transmitted to the frame. As a result, the reaction force of the frame vibration is transmitted to the parts passage as unnecessary vibrations, thus obstructing vibrations that should originally contribute to the parts supply, which causes a reduction in the parts supply capability of the vibratory parts feeder. Yes. In addition, when an apparatus for the next process is placed on the same frame, the processing performed by the apparatus may be adversely affected. This is because, since the leaf spring is used in an inclined state, the horizontal vibration is well absorbed, but the vertical vibration is hardly absorbed.
[0008]
Moreover, since the vibration-type parts feeder in which the vibration source as disclosed in Patent Document 2 is supported via the coil spring is provided with a coil spring that can absorb vibration in the vertical direction on the lower surface of the base, Vibration from the vibration source is hardly transmitted to the frame, and the parts supply capability of the vibration type part feeder due to unnecessary vibration from the frame is hardly hindered. This is because a coil spring having a low spring constant that can sufficiently absorb the vibration from the vibration source is used. However, when the component storage portions are arranged side by side on the base, the mass corresponding to the supplied component of the total mass supported by the vibration suppression spring varies as the component is supplied. Usually, in order to sufficiently absorb the vibration from the vibration source, a vibration suppression spring having a sufficiently low spring constant is used, and the amount of bending of such a vibration suppression spring is the mass on the vibration suppression spring. Be susceptible to fluctuations. As a result, the height of the component supply port varies depending on the amount of deflection of the vibration suppressing spring, which causes a new problem that the supply position of the component is not constant. In addition, the amount of deflection of the vibration suppression spring is affected not only by the mass on the vibration suppression spring, but also by the impact at the time of replenishment of the component into the component storage part and the physical impact due to the external contact with the parts feeder. . Therefore, when used for the supply of minute electronic components that require strict supply position accuracy, it is not possible to employ a coil spring with a spring constant that has a sufficient vibration suppression effect, so unnecessary vibration from the frame is suppressed. I could n’t finish it.
[0009]
An object of the present invention is to design a vibration parts feeder design method capable of suppressing a decrease in parts supply capability caused by unnecessary vibration from a frame and making a change in the supply position of parts below a desired value, and The object is to provide a vibratory parts feeder.
[0010]
[Means for Solving the Problems]
The present invention has been made based on the above problems .
The design method of the vibration type parts feeder of the present invention includes a component passage having a component supply port for supplying a component to be supplied to the outside, and a vibration source having a vibration frequency of 150 Hz or more . A parts feeder body comprising a vibration mechanism engaged with the parts passage so that vibrations move parts on the parts passage toward the parts supply port; and the parts feeder body is disposed. A vibration part feeder design method comprising: a base, a frame that holds the base, and a vibration suppression spring that is disposed between the base and the frame and suppresses vibration in at least a vertical direction, The vibration frequency of the parts feeder body is f (Hz), the spring constant of the vibration suppression spring is K (N / m), and the total mass applied to the vibration suppression spring is M (kg). When I,
[0011]
[Formula 1]
[0012]
, The spring constant of the vibration suppression spring is K (N / m), the maximum mass fluctuation amount applied to the vibration suppression spring is ΔM (kg), the assumed external force applied to the vibration suppression spring is F (N), When the allowable fluctuation amount of the vertical position of the supply port is ΔX (m) and the gravitational acceleration is g (m / s ² ),
[0013]
[Formula 2]
[0014]
It is characterized by satisfying.
[0015]
By setting each parameter to satisfy these conditions, the vibration type part feeder that suppresses the vibration of the frame due to the vibration from the parts feeder main body and the position fluctuation of the part supply port satisfies the desired accuracy. Can be obtained.
[0016]
In the design method of the vibration type part feeder of the present invention, the vibration frequency f (Hz) of the parts feeder body, the spring constant K (N / m) of the vibration suppression spring, and the total mass applied to the vibration suppression spring. M (kg) is [0017]
[Formula 3]
[0018]
It is preferable to satisfy.
[0019]
By setting each parameter so as to satisfy such conditions, the effect of suppressing the vibration of the frame caused by the vibration from the parts feeder main body becomes more remarkable.
[0031]
DETAILED DESCRIPTION OF THE INVENTION
(Function)
In the following, the numerical value limiting operation of each parameter is described. The design method of the vibratory parts feeder of the present invention is to achieve the following two objects. That is, it is to suppress a decrease in component supply capability caused by unnecessary vibration from the frame, and to change a change in the component supply position to a desired value or less.
[0032]
First, for suppressing unwanted vibration from the frame, rather than increasing the resistance to vibration of the frame itself at the vibration frequency of the parts feeder body, the transmission efficiency of the vibration from the parts feeder body to the frame is suppressed. It suppresses unnecessary vibration. The present inventors have found that the transmission efficiency of vibration to the frame is due to the difference between the vibration frequency of the parts feeder main body and the vibration suppression spring and the resonance frequency of the configuration supported by the vibration suppression spring and the configuration supported by the vibration suppression spring. Focusing on the fact that the resonance frequency changes depending on the spring constant of the vibration suppression spring, the conditions for suppressing the vibration transmitted from the parts feeder body to the frame are as follows:
[0033]
[Formula 1]
[0034]
I found out that In the formula (I), the left side corresponds to the vibration suppression spring and the resonance frequency supported by the vibration suppression spring. That is, the expression (I) shows that when the resonance frequency of the vibration suppression spring and the structure supported by the vibration suppression spring is less than 70% of the vibration frequency of the vibration source, a substantial vibration suppression effect from the vibration source to the frame appears. Show. As shown in the formula (III), when the resonance frequency of the vibration suppression spring and the configuration supported by the vibration suppression spring is less than 50% of the vibration frequency of the vibration source, the vibration suppression effect from the vibration source to the frame is particularly remarkable. Therefore, even if a frame having a threaded portion that is relatively easy to vibrate or an aluminum frame is used, it can be sufficiently put into practical use.
[0035]
As the vibration frequency of the parts feeder main body, basically the vibration frequency of the vibration source can be applied as it is, but another vibration feeder is used to supply the parts to the parts passage, and the vibration energy is the parts. If the frequency is large enough to affect the vibration frequency of the feeder body, the vibration frequency of the vibration source and the vibration frequency of the vibration feeder may be compared to apply the lower frequency as the vibration frequency of the parts feeder body.
[0036]
Next, regarding the suppression of the change in the component supply position, the spring constant of the vibration suppression spring that has been the main factor of the change in the supply position is adjusted in accordance with the required supply position accuracy. And the conditions for making the change of the supply position of the component below a desired value (ΔX) are:
[0037]
[Formula 2]
[0038]
I found out that Here, the amount of deflection ΔX of the vibration suppression spring needs to set the maximum amount of deflection of the vibration suppression spring that can be assumed. Since this ΔX is expressed by (ΔM · g + F) / K, if this is modified, equation (II) can be obtained. Note that F in the formula (II) is a temporary impact force applied to the vibration suppression spring when a large amount of parts to be supplied are thrown in at once or when there is an external contact with the parts feeder. Even if such a force is applied to the vibration suppressing spring, it is incorporated in advance as an assumed external force so that a desired supply position accuracy can be always obtained. In addition, when the impact force which the components thrown in at once gives is sufficiently small, or the contact to the parts feeder from the outside etc. is not assumed, you may design as F = 0 (N).
[0039]
Further, the formula (IV) is obtained by substituting ΔX = 0.0001 (m) (= 100 μm) in the formula (II), and shows a vibration type parts feeder in which the supply position accuracy of the parts is always 100 μm or less. ing. The reason why ΔM is set to 0.01 (kg) or more is that when ΔM is smaller than 0.01 kg, the amount of parts that can be input at one time is small and inefficient.
[0040]
Here, the operating conditions of the vibration type parts feeder of the present invention will be described more specifically. A vibration source having a vibration frequency of approximately 50 to 60 Hz or 100 to 120 Hz is widely used in a general vibration type parts feeder depending on the mass of a component to be supplied. However, in order to suppress vibration from a vibration source having such a vibration frequency, it is necessary to set the spring constant of the vibration suppression spring sufficiently low in consideration of generally assumed operating conditions of the vibration type part feeder. is there. Therefore, there is no vibration suppression spring having a spring constant that satisfies the above expressions (I) and (II) at the same time, or even if there is an effect and supply of suppressing vibration transmitted from the vibration source to the frame. There is a restriction that the effect of improving the positional accuracy cannot be realized at a high level.
[0041]
On the other hand, it is said that it is generally more efficient to use a vibration source having a high vibration frequency of 150 Hz or more in order to stably supply minute parts. If such a vibration source is used, a spring constant that simultaneously satisfies the expressions (I) and (II) can be set.
[0042]
However, when the vibration frequency of the vibration source is high, the amplitude given to the component passage is small, so that the original supply capability is low and it is not very efficient for applications in which components having a relatively large mass are supplied. Further, in the case of such a large component, there is little need for strictly supplying position accuracy.
[0043]
Therefore, the vibration part feeder design method of the present invention can be more effectively applied to a vibration part feeder that supplies minute parts having a mass of 50 mg or less.
(Example)
First, the structure of the vibration type parts feeder of the present invention and a component conveying apparatus using the same will be described. FIG. 1 is a schematic cross-sectional view showing an embodiment of the vibration-type parts feeder of the present invention, FIG. 2 is a cross-sectional view showing the periphery of a vibration suppression spring in the vibration-type parts feeder of one embodiment of the present invention, and FIG. It is sectional drawing which shows the vibration suppression spring periphery in the vibration-type parts feeder of the other Example of invention.
[0044]
As shown in FIG. 1, the vibratory parts feeder 1 of the present invention is designed to vibrate a trough (component passage) 3 for placing a chip component W and supplying a chip component from a component supply port 3 a and a trough 3. Parts feeder main body 2 including a vibration source 4 and a vibration mechanism 5 engaged with the trough 3 so that vibration from the vibration source 4 can be transmitted to the component passage 3, and a base on which the part feeder main body 2 is disposed 6, a frame 7 that holds the base 6, a coil spring (vibration suppression spring) 8 that is disposed between the base 6 and the frame 7 and suppresses vibration in at least the vertical direction, and chip components are supplied onto the trough 3. And a vibration feeder 10 that performs.
[0045]
The trough 3 is a U-shaped straight passage having a bottom surface portion and a side surface portion, and is disposed so that the bottom surface portion is substantially horizontal. The one end side corresponds to the component supply port 3a for discharging the chip component that has moved on the trough 3, and the arrangement position is adjusted so that the desired component supply position coincides with the component supply port 3a. .
[0046]
The vibration source 4 is a piezoelectric vibrating body that vibrates at a predetermined vibration frequency, and transmits the vibration to the trough 3 to move the chip components on the trough 3 toward the component supply port 3a. In this embodiment, a piezoelectric vibrating body is used as a vibration source, but an electromagnetic vibrating body in which an electric coil and a permanent magnet are combined may be used.
[0047]
The vibration mechanism 5 has one end engaged with the bottom surface of the bottom surface of the trough 3 and a pair of leaf springs 5a arranged in parallel to the longitudinal direction of the trough 3, and the other end of the leaf spring 5a. It comprises a holder 5b that holds the leaf spring 5a. The leaf spring 5a is held in an inclined state so as to bend in the longitudinal direction of the trough 3, and vibration sources 4 are provided on both main surfaces of the leaf spring.
[0048]
The base 6 is a flat plate to which the holder 5b and the vibration feeder 9 are fixed on one main surface side, and a recess for providing the coil spring 8 is formed on the other main surface side.
[0049]
The coil spring 8 is for suppressing the vibration from the vibration source 4 from being transmitted to the frame 7. As shown in FIG. 2, the coil spring 8 is housed in a recess 6 a provided in the base 6. Further, both ends of the coil spring 8 are fixed to a plate 8a on which a female screw is formed. One end of the coil spring 8 is screwed to the base 6 side and the other end is screwed to the frame 7 side by a male screw 8b. Yes.
[0050]
The vibration feeder 10 is for supplying the chip component W onto the trough 3. The configuration of the vibration feeder 10 includes a bowl portion 10a that vibrates in a spiral shape, a bowl portion vibration source (not shown) that vibrates the bowl portion 10a, and a discharge port 10b that communicates with the bowl portion 10a. The chip components W are loaded into the bowl portion 10a by a component loading mechanism (not shown), and are sequentially supplied onto the trough 3 from the discharge port through a passage formed in the bowl portion 10a.
[0051]
In FIG. 3, a U-shaped leaf spring 9 is provided instead of the coil spring. The U-shaped plate spring 9 is composed of a flat plate portion 9a and a curved portion 9b, and the two flat plate portions 9a are connected via the curved portion 9b, and the curved portion 9b provides springiness. The flat plate portions 9a are respectively screwed to the fixing plate 9b, and the two upper and lower fixing plates 4b are screwed to the base 6 and the frame 7, respectively.
[0052]
Next, the parameters of each component of the vibratory parts feeder were set as follows. First, as operating conditions of the vibration type parts feeder, a chip part having a mass of 10 mg is supplied, and when the chip part is replenished, 1 kg is charged at a time (ΔM), and the vibration frequency f of the vibration source is 200 Hz, The assumed external force F was 10N. The total mass M applied to the coil spring was 10 kg. The component supply position accuracy required under the above operating conditions was set within 100 μm. The above conditions were applied to the expressions (I) and (II) to set the spring constant of the coil spring. Among these, the spring constants set so as to satisfy the formula (III) were designated as Examples 1 and 2, and those satisfying the formula (I) but not satisfying the formula (III) were designated as Example 3 .
[0053]
As a comparative example, the vibration frequency of the vibration source is 100 Hz and the spring constant of the coil spring is 1 × 10 ⁶ N / m (Comparative Example 1), and the vibration frequency of the vibration source is 100 Hz and the spring constant of the coil spring is 0. .1 × 10 ⁶ N / m (Comparative Example 2 ), the vibration frequency of the vibration source is 100 Hz and the spring constant of the coil spring is 3 × 10 ⁶ N / m (Comparative Example 3 ), the vibration frequency of the vibration source Is 100 Hz, the spring constant of the coil spring is 5 × 10 ⁶ N / m (Comparative Example 4 ), the vibration frequency of the vibration source is 200 Hz, and the spring constant of the coil spring is 0.05 × 10 ⁶ N / m ( Comparative Example 5 ), a vibration source having a vibration frequency of 200 Hz and a coil spring having a spring constant of 10 × 10 ⁶ N / m (Comparative Example 6 ) was prepared, and under the same conditions as the vibration type parts feeder of the present invention, Supply capacity and supply position of vibratory parts feeder It was to evaluate the maximum error. The results are shown in Table 1. In addition, regarding the supply capacity of the vibration type part feeder, when the supply capacity of the vibration type part feeder using a surface plate instead of the frame is 100%, it is “○” when 95% or more, 80% or more 95 When it is less than%, “Δ” is attached, and when it is less than 80%, “X” is attached.
[0054]
[Table 1]
[0055]
As shown in Table 1, in the vibration type part feeders of Examples 1 to 3 , the decrease in component supply capacity is smaller than that of Comparative Examples 3 , 4 and 6 , and particularly high effects are obtained in Examples 1 and 2. I understand that. Furthermore, it can be seen that the supply position accuracy is suppressed to within 100 μm.
[0056]
On the other hand, the vibration type part feeders of Comparative Examples 2 and 5 are not preferable because an error exceeding 100 μm appears in the supply position accuracy although there is almost no decrease in the parts supply capability. Further, in the vibration type part feeders of Comparative Examples 3 , 4 , and 6 , the supply position accuracy is suppressed to 100 μm or less, but it is not preferable because the parts supply capability is greatly reduced.
[0057]
When Example 1 and Comparative Example 1 are compared, the supply position accuracy is comparable, but there is a difference in supply capability. In addition, as can be seen from a comparison between Example 2 and Comparative Example 3 , when trying to achieve more rigorous supply position accuracy, Comparative Example 3 having a vibration frequency of 100 Hz can exhibit its supply capability of less than 80%. I understand. Therefore, by setting the vibration frequency to 150 Hz or more, it is possible to prevent a reduction in supply capability while realizing high supply position accuracy.
[0058]
Here, the component conveying apparatus using the vibration type parts feeder of this invention is demonstrated. FIG. 4 is a schematic perspective view showing an example of the component conveying apparatus of the present invention. The component conveying apparatus 100 is used for an appearance inspection of a chip component, and includes a conveying plate 11a for conveying the chip component W and a conveying plate driving means 11b on the frame 7 of the vibration type part feeder 1. The mechanism 11, the camera 12 for imaging the appearance of the chip component W placed on the transport plate 11a, and the chip component W placed on the transport plate 11a are removed from the transport plate 11a at a predetermined position. An air blow mechanism (not shown) for collection is provided. The chip components W supplied from the component supply port 3a of the vibration type part feeder 1 onto the conveying plate 11a are aligned in the circumferential direction by an alignment member (not shown), and then the conveying plate 11a is moved in the direction of the arrow in the figure. It is transported as it rotates. The transport plate 11a is made of a transparent member so that the chip component W can be imaged from above and below at a predetermined position. The chip parts W that have been imaged are judged to be good or bad, and are removed and collected from the transport plate 11a by the air blow mechanism according to good or bad at a predetermined position.
[0059]
In the case of a component conveying apparatus such as that used for the appearance inspection of a chip component as described above, it is necessary to supply the chip component with high positional accuracy. Therefore, the vibratory parts feeder as in the present invention is particularly useful. Further, in the present embodiment, the appearance inspection is given as an application of the component conveying apparatus, but the present invention is not particularly limited to this, and can be applied to, for example, component supply to a conveying mechanism having a component suction nozzle.
[0060]
【The invention's effect】
If it is a vibration type part feeder based on the design method of the vibration type part feeder of the present invention, a part passage having a part supply port for supplying a part to be supplied to the outside and a vibration source having a vibration frequency of 150 Hz or more are provided. A parts feeder main body, and a parts feeder main body having a vibration mechanism engaged with the part passage so that vibration from the vibration source moves the part on the part passage toward the part supply port A vibration suppression spring that suppresses at least vibration in the vertical direction is disposed between the base that holds the base and the frame that holds the base, and the vibration frequency f (Hz) of the drive source and the spring constant K (N / M), and the total mass M (kg) applied to the vibration suppression spring satisfies the formula (I), so the transmission efficiency from the parts feeder body to the frame is kept low. It can, as a result, it is possible to suppress the reduction of the component supply capability to suppress the vibration of the frame caused by vibration from the parts feeder body. Further, the spring constant K (N / m) of the vibration suppression spring, the maximum mass fluctuation amount ΔM (kg) applied to the vibration suppression spring, the assumed external force F (N) applied to the vibration suppression spring, and the allowable fluctuation of the vertical position of the component supply port Since the amount ΔX (m) and the gravitational acceleration g (m / s2) satisfy the formula (II), the position fluctuation of the component supply port can also achieve a desired accuracy.
[0061]
When the vibration frequency f (Hz) of the drive source, the spring constant K (N / m) of the vibration suppression spring, and the total mass M (kg) applied to the vibration suppression spring satisfy the formula (III), the parts feeder The effect of suppressing the vibration of the frame due to the vibration from the main body becomes more remarkable.
[0063]
In addition, since the component conveying apparatus of the present invention uses the above-described vibration type part feeder, stable component conveyance is possible, and it is possible to cope with processing that requires more accurate positioning.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view showing an embodiment of a vibratory parts feeder according to the present invention.
FIG. 2 is a cross-sectional view showing the periphery of a vibration suppression spring in a vibration part feeder according to an embodiment of the present invention.
FIG. 3 is a cross-sectional view showing the periphery of a vibration suppression spring in a vibration type part feeder according to another embodiment of the present invention.
FIG. 4 is a schematic perspective view showing an example of a component conveying apparatus of the present invention.
[Explanation of symbols]
1 Vibrating parts feeder 2 Parts feeder body 3 Trough (part passage)
4 Vibration source 5 Excitation mechanism 6 Base 7 Frame 8 Coil spring (vibration suppression spring)
9 U-shaped leaf spring 11 Component transport mechanism 100 Component transport device

Claims (2)

A component passage having a component supply port for supplying a component to be supplied to the outside and a vibration source having a vibration frequency of 150 Hz or more, and a component in which vibration from the vibration source is on the component passage A parts feeder main body comprising a vibration mechanism engaged with the component passage so as to be moved in the direction of the supply port;
A base on which the parts feeder main body is disposed;
A frame for holding the base;
A vibration suppressing spring disposed between the base and the frame and suppressing vibrations at least in a vertical direction;
A method for designing a vibratory parts feeder comprising:
When the vibration frequency of the parts feeder body is f (Hz), the spring constant of the vibration suppression spring is K (N / m), and the total mass applied to the vibration suppression spring is M (kg),
[Formula 1]
The filling,
The spring constant of the vibration suppression spring is K (N / m), the maximum mass fluctuation amount applied to the vibration suppression spring is ΔM (kg), the assumed external force applied to the vibration suppression spring is F (N), and the component supply port When the allowable fluctuation amount of the vertical position is ΔX (m) and the gravitational acceleration is g (m / s ² ),
[Formula 2]
A design method for a vibratory parts feeder characterized by satisfying The vibration frequency f (Hz) of the parts feeder body, the spring constant K (N / m) of the vibration suppression spring, and the total mass M (kg) applied to the vibration suppression spring,
[Formula 3]
The method for designing a vibratory parts feeder according to claim 1, wherein: