JP4431440B2 - Resin supply device and resin supply method - Google Patents

Description

  The present invention relates to a resin supply apparatus and a resin supply method suitable for application when supplying an appropriate amount of resin to a cavity such as a resin sealing apparatus.

  Conventionally, for example, as shown in FIG. 5 (a), a predetermined amount of a tablet 36 is inserted in advance into the mold cavity 14 to place the semiconductor mounting substrate 34 between the upper mold 31 and the frame-shaped mold 32. Then, as shown in FIG. 5 (b), the substrate 34 is sandwiched between the upper mold 31 and the frame-shaped mold 32, and the compression mold 33 heated by a heater (not shown) is raised to raise the tablet 36. A resin sealing device 30 that heats and melts the resin is known.

  However, in the resin sealing device 30, when the resin is supplied into the cavity 14 in units of tablets as described above, the resin amount cannot be finely adjusted. Therefore, an appropriate amount of resin cannot be supplied when the number and size of the moldings to be sealed change for each sealing unit.

  Therefore, for example, Patent Document 1 discloses a configuration in which a resin divided into smaller particles is weighed so as to be an amount necessary for one molding, and the weighed resin is supplied into the cavity. ing.

  This configuration will be briefly described with reference to FIG.

  The resin supply device 20 supplies granular resin (granular, granulated, powdery, crushed after tableting, etc.) as a resin, and includes an electronic balance 11, a granular resin charging unit 21, a hopper 22, The shutter 23, the cup transport mechanism 25, and the control device 12 are mainly provided. The measuring shutter 23 is formed with a through hole 23a having a volume slightly smaller than the amount of resin required for molding and a through hole 23b having a minute volume.

  In this resin supply device 20, the cup 24 is transported to the lower part of the hopper 22 by the cup transport mechanism 25 to bring the state shown in FIG. Adjust. Then, as shown in FIG. 7B, the granular resin in the hopper 22 falls into the through hole 23a by an amount corresponding to the volume (a little smaller than the amount of resin required for one molding). To do. When the metering shutter 23 is further moved, the granular resin inside the through hole 23a falls into the cup 24 as shown in FIG.

  Next, the cup transport mechanism 25 transports the cup 24 to the electronic balance 11 to measure the weight of the granular resin inside the cup, and the result is input to the control device 12. In the control device 12, the number of times of opening / closing the measurement shutter 23 for satisfying the shortage is calculated according to the difference.

  When the cup 24 is conveyed again to the lower part of the hopper 22 and the measuring shutter 23 is moved, the through hole 23b is aligned with the hole of the hopper 22 as shown in FIG. The granular resin inside the through hole 23 b falls into the cup 24. The metering shutter 23 repeats the above operation for the calculated number of times of supply. Thereafter, the cup 24 is again conveyed to the electronic balance 11 and the resin weight is measured.

  When the weight falls within the allowable range, the cup 24 is moved onto the charging container 21c where it is tilted and inverted. The charging container 21c charged with the granular resin is moved onto the cavity 14, and the open / close shutter 21d is opened to supply the resin into the cavity 14.

JP 2003-231145 A

  However, in such a device that supplies the measured resin into the cavity via the measuring cup, fine powder may adhere to the weighing pan on the electronic balance and remain in the cavity. Even when the resin is transferred into the container, the resin may remain in the charging container, and there is a problem that the supply amount actually supplied is not always accurate even if the weighing itself is accurately performed.

  Further, the cup has to be reciprocated between the hopper and the electronic balance several times for weighing, and it takes time for weighing. Further, a mechanism for the reciprocation and a mechanism for transferring the resin from the cup to the charging container and from the charging container to the cavity are also required, which complicates the entire apparatus.

The present invention was made to solve such conventional problems, with a simple configuration, accurately weighed actually resin amount to be supplied, of reducing the supply cycle time It is an object of the present invention to provide a resin supply device and a resin supply method that can be used.

The present invention provides a resin supply apparatus for supplying a resin to be molded into a cavity, and can measure a resin supply amount control means having a function of adjusting the resin supply amount and the amount of resin supplied to the cavity. A measuring unit, and a calculating means is attached to the resin supply amount control means, wherein at least one near target value for the final target value of the resin supply amount is set in the calculating means, When it is estimated that the previous target value has been reached, the stability of the weighing value of the measuring instrument is confirmed. After the stability is confirmed , the supply amount up to the present is determined based on the weighing value of the measuring instrument. Based on the difference between the supply amount and the next previous or final target value, the supply mode up to the next target value can be set, and the resin supply amount control means includes two or more types. The supply speed can be set and 1 By feed rate is possible deceleration during the resin supply is obtained by solving the above problems.

  There are various embodiments or variations in the present invention. These will be described in detail below.

In a simple configuration, it can actually resin amount to be supplied accurately weighed to obtain the method the resin supply device and a resin supply capable of shortening the supply cycle time.

  Hereinafter, an example of an embodiment of the present invention will be described in detail based on the drawings.

  FIG. 1 is a schematic perspective view showing a resin supply apparatus 100 according to an example of an embodiment of the present invention.

  This resin supply device 100 is obtained by placing a resin supply amount control means 110 directly on an electronic balance (meter) 112.

  The resin supply amount control means 110 has both a function of adjusting the resin supply amount and a function of conveying and supplying the resin directly into the cavity C. The resin supply amount control means 110 includes a funnel 114, a resin reservoir 116, a supply nozzle 118, and a flat nozzle 120.

  The funnel 114 has a substantially conical shape and can hold a predetermined amount of resin. The resin reservoir 116 has a box shape and is disposed below the funnel 114. The resin reservoir 116 has a function of receiving the resin falling from the funnel 114 and sending it to the supply nozzle 118 side. The supply nozzle 118 is connected to the side surface 116 </ b> A of the resin reservoir 116 and conveys the resin sent from the resin reservoir 116 side to the flat nozzle 120. The supply nozzle 118 is installed in a state where the flat nozzle 120 side is inclined about 15 degrees downward from the resin reservoir 116 side so that the resin on the resin reservoir 116 side can be smoothly conveyed to the flat nozzle 120. The inclination of 15 degrees can be appropriately changed according to the particle state of the resin. The flat nozzle 120 is a flat plate-like tray having a standing wall 120A for preventing the resin from dropping, and is for supplying the resin into the cavity C in a state where the resin is evenly diffused over a wide range. The flat nozzle 120 can also be replaced with various shapes depending on the resin particle state or the shape of the cavity C of the supply destination. Depending on the shape of the cavity C, it can be omitted.

  The resin supply amount control means 110 includes a support 122. The column 122 supports the funnel 114, the resin reservoir 116, the supply nozzle 118, and the flat nozzle 120. A vibrator (vibration generating means) 124 is attached to the support column 122. The vibrator 124 can generate vibrations throughout the funnel 114, the supply nozzle 118, and the flat nozzle 120 via the resin reservoir 116. A weight 126 is attached to the side of the resin reservoir 116 opposite to the supply nozzle. The weight 126 can amplify the vibration generated by the vibrator 124 by resonating with the resin reservoir 116 and the like and repeatedly hitting the rear portion of the resin reservoir 116.

  A vibrating rod (vibrating body) 128 that reaches the center of the resin reservoir 116 is attached to the center of the funnel 114 so as to freely vibrate (or swing) by the vibration of the vibrator 124.

  The support 122 is placed on the electronic balance 112 via the pedestal 130 and the vibration isolator 132. The electronic balance 112 can measure the weight of the resin to be supplied together with the weight of the resin supply amount control means 110.

  An arithmetic unit 136 is attached to the resin supply amount control means 110. The arithmetic device 136 receives the measurement result of the electronic balance 112, and transmits a command for causing the vibrator 124 to vibrate for a predetermined time based on the result of the predetermined calculation. Due to the vibration of the vibrator 124, the entire funnel 114, the resin reservoir 116, the supply nozzle 118, and the flat nozzle 120 vibrate, and the resin existing at each position moves by an amount corresponding to the vibration time, and the cavity C It is configured to be transported by being dropped and supplied inside.

  Next, the operation of the resin supply apparatus 100 according to an example of the embodiment will be described according to the flowchart shown in FIG.

  First, in step 150, m is set to 2. This will be described later. Next, in step 152, a slightly larger amount of resin than the final target value Ae of the supply amount to be supplied to the cavity C is put into the funnel 114, and the weight on the electronic balance 112 when the electronic balance 112 generates a stability signal. Weigh W1. This weight W1 corresponds to the total value of the weight of all the members constituting the resin supply amount control means 110 and the weight of the vibration isolating material in addition to the resin charged into the funnel 114. The weight W1 is recorded in the arithmetic unit 136 as an initial value.

  Next, proceeding to step 154, a vibration command is transmitted to the vibrator 124 in accordance with a command from the arithmetic device 136. As a result, the entire funnel 114, the resin reservoir 116, the supply nozzle 118, and the flat nozzle 120 vibrate, and the resin existing at each position moves by an amount corresponding to the vibration time. Along with this movement, a predetermined amount of resin is supplied from the flat nozzle 120 into the cavity C.

  When the resin in the funnel 114 is sequentially supplied into the cavity C through the flat nozzle 120 by the vibration of the vibrator 124, the measured value (current value) Wp of the electronic balance 112 corresponding to the supplied resin amount decreases. I will do it. In step 156, this reduced state is continuously monitored by the arithmetic device 136, and the supply amount Fp is calculated by subtracting the current value Wp from the initial value W1. At this time, in consideration of the fact that the current value Wp of the electronic balance 112 may be shaken due to vibration and the accurate current value Wp may not be detected, the shake amount is measured in advance and corrected by the arithmetic unit 136. Use as value Wp.

  In step 158, it is determined whether or not the supply amount thus obtained has become larger than the first near target value A1. The first near target value A1 is set so as not to exceed the final target value Ae in the first supply in consideration of the fluctuation of the supply amount Fp and the fluctuation of the current value Wp of the electronic balance 112 touched by vibration. It is the near target value.

  While it is determined that the supply amount Fp is smaller than the first front target value A1, the process returns to step 156 and measurement is continued, and it is determined that the supply amount Fp is equal to or greater than the first front target value A1. In step 160, the vibration of the vibrator 124 is stopped.

  Thereafter, in step 162, the process waits for the vibration to converge and a stable signal to be generated from the electronic balance 112. When the stability signal of the electronic balance 112 is obtained in step 162, the process proceeds to step 164, and the arithmetic unit 136 reads the current value Wp again to calculate the correct supply amount Fp at the present time, and calculates the current supply value Fp from the final target value Ae. The supply amount Fp is subtracted to calculate the unachieved amount (resin amount that is still insufficiently supplied) Up.

  In step 166, it is determined whether or not the unachieved amount Up is within the preset error range of the final target value Ae. If it is determined that it is within the range, the process proceeds to step 168 to complete the supply.

  On the other hand, when it is determined that the error range has not yet been reached, the difference Dm from the unachieved amount Up to the mth previous target value Am is calculated as an additional fee, and the difference Dm is measured in advance. The vibration time Bm is calculated by dividing by the hourly supply speed V. Here, in step 150, since m is initially set to 2, specifically, a difference D2 from the second previous target value A2 is calculated here, and the second value is calculated based on this difference D2. The vibration time B2 for reaching the previous target value A2 is set.

  After the setting, m is incremented by 1. In step 172, the vibrator 124 is turned on again for the calculated vibration time B2, and the additional supply of resin is resumed. Thereafter, the process returns to step 162 and the same operation is repeated. However, since m is incremented by 1 at the time of the previous execution of step 170, in this step 170, a difference D3 from the third previous target value A3 is calculated, and based on this difference D3 The vibration time B3 for reaching the third near target value A3 is set. The third near target value A3 is a value set closer to the final target value Ae by a predetermined amount than the second near target value A2.

  Thus, if the operations of steps 162 to 172 are repeated, it will be determined in step 166 that the unachieved amount Up has fallen within the error range. Therefore, the process proceeds to step 168 at this stage, and the supply is completely terminated.

  According to this embodiment, the metering and additional supply are repeated until the unachieved amount Up falls within the final error range, so that the supply amount Fp always falls within the error range of the final target value Ae. Can be supplied. The resin supply amount Fp is obtained from the difference between the initial initial value W1 and the current value Wp, and this difference corresponds to the total amount that has been introduced into the cavity C so far. Regardless of the amount of resin remaining in any part of the control means 110, the measured and calculated supply amount Fp and the actual supply amount must be consistent (within the range of the measurement error of the electronic balance 112). ing.

  In addition, since the weighing operation and the supply operation are integrated, it is not necessary to transport the cup every time weighing is performed, and the structure is simple.

  Furthermore, finally, vibration for eliminating the difference Dm between the value immediately before falling within the error range and the next target value Am is only generated, and therefore, for example, the influence of the temperature drift of the electronic balance 112 In addition, since the weighing operation can be performed in a state of being commonly received, highly reliable weighing (difference calculation) can be performed.

  In this embodiment, since the resin supply amount control means 110 includes the vibrator (vibration generating means) 124, the structure of the transport system is simple, and further cost reduction can be realized. Further, since the weight 126 for amplifying the vibration generated by the vibrator 124 is attached, even if the vibration generated by the vibrator 124 is small, it can be efficiently amplified. Furthermore, the vibration rod (vibrating body) 128 that prevents or eliminates clogging of the resin is installed in the funnel 114 using the vibration of the vibrator 124, so that the resin is smoothly conveyed without clogging. be able to.

  In this embodiment, when the arithmetic unit 136 estimates that the resin supply amount has reached the near target values A1, A2,... Am set to 2 or more with respect to the final target value Ae, Based on the current value Wp in the electronic balance (meter) 112, the supply amount Fp up to the present is calculated, and based on the difference Dm between the supply amount Fp and the next target value A2, A3,. Since the supply mode up to the next previous target values A2, A3,... Am is reset, the supply mode (in this case, the vibration time, the final error is minimized based on the latest information). That is, the supply time) is set. Therefore, the final supply amount can be reliably kept within the error range of the final target value Ae.

  The arithmetic device 136 may be provided separately from the resin supply amount control means 110 as in this embodiment, or may be provided integrally. When attached separately, the weight of the resin supply amount control means 110 placed on the electronic balance 112 can be reduced accordingly, so that the burden on the electronic balance 112 can be reduced and the reliability of the measurement value itself is also achieved. You can increase that much. On the other hand, when the arithmetic unit 136 is provided integrally with the resin supply amount control unit 110, a wire harness or the like is not necessary, and thus handling becomes easier.

  The present invention has various variations.

  FIG. 3 shows another example of the resin supply amount control means. The resin supply amount control means 210 does not convey the resin by vibration and inclination, but conveys it by the screw conveyor 270. That is, the resin dropped from the funnel 214 to the start end 270 </ b> A of the screw conveyor 270 is conveyed by the screw conveyor 270 that is rotationally driven by the driving unit 272 and falls into the cavity C. From the calculation device 236, the drive time of the screw conveyor 270 is calculated (instead of the vibration time of the vibrator 124).

  Since the other configuration is the same as that of the previous embodiment, the same reference numerals are given to the parts corresponding to those in FIG. 1 in FIG. In this embodiment, since the resin is transported by the screw conveyor 270, the correlation between the drive time and the supply amount is strong, and a predetermined amount of resin can be supplied more reliably. In addition, there is very little risk that a larger amount of resin than expected will be supplied when the final target value is approached. Furthermore, since the vibration generated in the resin supply amount control means 210 is also small, it is possible to shorten the time until the electronic balance 212 is stabilized, and it is easy to obtain a stable value for the measured value itself.

  FIG. 4 shows resin supply amount control means 310 according to still another configuration example. The resin supply amount control means 310 is configured to convey the resin by the belt conveyor 370. In other words, in this embodiment, the belt conveyor 370 is driven to carry the resin immediately below the funnel 314, thereby creating a space between the opening 314 </ b> A of the funnel 314 and the belt 370 </ b> A of the belt conveyor 370. The resin is continuously conveyed in such a manner that the resin inside falls. About another structure, it is substantially the same as the example provided with the previous screw conveyor 270. FIG. Accordingly, in this example as well, the same or similar parts are given the same reference numerals, but the duplicated explanation is omitted. Also in this structural example, the effect similar to the example which provided 270 in the previous screw conveyor is acquired.

In the present invention, the specific configuration of the tree butter supply amount control means is not particularly limited. In short, the resin is directly supplied to the cavity by the resin supply amount control means capable of adjusting and discharging the resin supply, and the amount of the supplied resin is measured together with the resin supply amount control means by the meter. If the measured value of the measuring instrument is reflected in the supply amount adjustment by the resin supply amount control means, the resin can be reliably supplied into the cavity by the accurately calculated supply amount.

In the above embodiment, while the resin supply amount control means is supplying the resin, the measurement value obtained by the vibration is not necessarily accurate, so that the supply is stopped every time accurate measurement is performed. that it has to.

  That is, when the resin supply amount control means is placed on the measuring instrument through an effective vibration isolation mechanism using an extremely small vibration system, for example, the tip of the resin discharge portion of the resin supply amount control means A gate is provided to measure the resin supply amount discharged from the gate via a measuring instrument in real time, and the time when the measured value in real time reaches within the error range of the final target value (or considering the response speed). The gate may be closed immediately before the operation).

  In the above-described embodiments, the supply speed is basically constant, and the supply amount is controlled by the vibration time or the drive time. However, for example, when the supply mode is changed at a predetermined near target value, the “supply mode” to be changed includes the concept of supply speed. That is, the resin may be transported and supplied at a faster supply speed up to a specific target value before, and the resin may be transported and supplied at a slower supply speed (as the final target value is approached). If it says in the example of the said embodiment, a supply speed | rate can be controlled by changing the amplitude adjustment of a vibrator | oscillator, the rotational speed of a screw conveyor, or the conveyance speed of a belt conveyor. Alternatively, the supply speed can be changed by having two or more resin transport paths and selecting (or combining) the resin transport paths.

  In this way, when the resin supply amount control means can set two or more types of supply speeds and the supply speed can be changed during one resin supply, the supply time is shortened and the supply amount is reduced. It is possible to achieve both higher accuracy.

  In the above embodiment, a granular resin is used as the resin to be supplied. However, depending on the size of the cavity, the resin may be in a tablet form or before tableting, or may be substantially liquid. Applicable.

  The present invention is applicable in the field of supplying resin into a cavity of a resin supply device.

The perspective view which shows the resin supply apparatus with which the 1st Embodiment of this invention was applied The flowchart which shows the process sequence in embodiment of FIG. The perspective view which shows the resin supply apparatus with which the 2nd Embodiment of this invention was applied. The perspective view which shows the resin supply apparatus with which the 3rd Embodiment of this invention was applied. A perspective view showing an example of a conventional resin sealing device The perspective view which shows the structural example of the resin supply apparatus employ | adopted in the prior art example of FIG. It is explanatory drawing which shows the injection | throwing-in procedure of the powdery resin by the measurement shutter in the prior art example of FIG. 5, (a) at the time of standby, (b) at the time of initial resin discharge from a hopper, (c) is the initial resin to a cup. At the time of charging, (d) shows when additional resin is discharged from the hopper.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 ... Resin supply apparatus 110 ... Resin supply amount control means 112 ... Electronic balance (meter)
114 ... funnel 116 ... resin reservoir 118 ... supply nozzle 120 ... flat nozzle 122 ... support post 124 ... vibrator (vibration generating means)
128 ... Vibrating rod (vibrating body)
130 ... Base 132 ... Antivibration material C ... Cavity

Claims (12)

In the resin supply device for supplying the resin to be molded into the cavity,
A resin supply amount control means having a function of adjusting the resin supply amount; and a meter capable of measuring the amount of resin supplied to the cavity,
A calculating means is attached to the resin supply amount control means,
In the calculation means, at least one near target value for the final target value of the resin supply amount is set,
When it is estimated that the previous target value has been reached, confirm that the measurement value of the measuring instrument is stable ,
After the stability is confirmed, the supply amount up to the present is calculated based on the measured value in the measuring instrument, and the next target is calculated based on the difference between the supply amount and the next previous or final target value. The supply mode up to the value can be set,
Furthermore, the resin supply amount control means can set two or more types of supply speeds, and the supply speed can be decelerated during one resin supply. In claim 1,
The resin supply device is characterized in that the resin supply amount control means decelerates the supply speed with the near target value as a boundary. In claim 1 or 2,
A resin supply device that calculates a supply time to the next target value based on the difference, and continues supply to the next target value for the calculated time. In claims 1 to 3,
The resin supply apparatus, wherein the resin is supplied directly from the resin supply amount control means to the cavity. In any one of Claims 1 thru | or 4,
The resin metering device, wherein the meter can mount the resin supply amount control means as it is, and measures the resin amount supplied to the cavity together with the resin supply amount control means. In any one of Claims 1 thru | or 5,
The resin supply amount control means includes at least one vibration generating means. In claim 6,
A resin supply apparatus, wherein a weight for amplifying the generated vibration is attached to at least one of the vibration generating means. In claim 6 or 7,
At least one of the vibration generating means is provided with a vibrating body that prevents or eliminates clogging of the resin by vibration. In any one of Claims 1 thru | or 8.
The resin supply amount control means comprises a gate at the tip of the resin discharge part,
The resin supply amount discharged from the gate via the meter is measured in real time,
A resin supply device that closes the gate when the supply amount measured in real time reaches the final target value or just before it. In claim 1,
The resin supply amount control means includes a screw conveyor. In claim 1,
The resin supply amount control means includes a belt conveyor. In a resin supply method of a resin supply apparatus, comprising: a resin supply amount control means having a function of adjusting a resin supply amount; and a meter capable of measuring the amount of resin supplied.
A procedure for setting at least one near target value for the final target value of the resin supply amount;
A procedure for confirming the stability of the weighing value of the measuring instrument when it is estimated that the near target value has been reached;
After the stability is confirmed, the supply amount up to the present is calculated based on the measured value in the measuring instrument, and the next target is calculated based on the difference between the supply amount and the next previous or final target value. A procedure for setting the supply mode up to the value,
A procedure for reducing the supply speed during one resin supply;
The resin supply method of the resin supply apparatus containing this.

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