JP2013107286A - Float-molding control apparatus, and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve yield of a molded article by repeatedly stabilizing the retracting timing of insert-molding accurately wherein a holding pin is retracted into a die in the middle of charging a molten resin into the cavity, and an insert member is made to reside in the resin without being exposed to the external surface.SOLUTION: The float-molding control apparatus is used for a float-molding machine which includes a holding pin, which makes the insert member float from the die in advance, and the float-molding die in which the operating core to be linked with the holding pin has been incorporated. In the float-molding machine, the holding pin and the operating core are made to retract in the middle of charging the resin, and a space of the pin trace which is left on the resin surface accompanying the retracting of the holding pin is filled with the remaining filling resin. The retracting control of the holding pin and the operating core is performed in such a manner that the V(velocity)-P(pressure) switching position or the secondary injection switching position of the molding machine is output as an output signal, the output signal is taken in as an input signal, and a retracting signal is output to the holding pin and the operating core on the basis of the input signal in the float-molding control apparatus. The float-molding control apparatus and the method are provided.

Description

  The present invention relates to a float forming control device and a manufacturing method for retaining an insert member inside a resin without exposing the insert member to the outer surface of the resin in insert molding for wrapping the insert member with resin.

  As a manufacturing method of insert molding that keeps the insert member inside the resin without exposing it to the outer surface of the resin, a mold in which a holding pin that floats the insert member from the mold and an operating core that is interlocked with the holding pin is used in advance. It was. The operating core is operated in the middle of filling the mold with the resin melted by the molding machine, and the holding pins are retracted into the mold. The space of the pin mark remaining on the resin surface with the retraction of the holding pin is filled with the remaining filling resin so that the insert member is not exposed to the outer surface of the resin.

  Conventionally, as described in Japanese Patent No. 4576212, the retraction timing of the holding pin and the operating core is performed at a preset elapsed time from the start of injection of the molding machine filled with molten resin. However, the filling time of the molten resin varies due to various factors such as the viscosity of the resin, the flow resistance in the molding machine screw and the mold, and the influence of the outside air temperature. Performing the above retraction timing with a preset elapsed time from the start of injection aims to retreat the holding pin and the operating core assuming that a certain amount of resin volume is filled in the mold. However, in actuality, the assumed resin volume is insufficient or excessive due to variations in the filling time of the molten resin.

  If the resin volume is insufficient below the assumed resin volume, the remaining filled resin volume increases, so that a large amount of deformation stress is applied to the insert member from the flow of the filled resin, and the insert member is deformed. Thereby, after taking out from a metal mold | die, there exists a possibility that an insert member may be exposed to the resin outer surface of a molded article. On the other hand, if the volume of the resin exceeds the assumed resin volume, the remaining filled resin volume is reduced, so that the flow of the filled resin is reduced, and the space of the retaining pin mark remains in the molded product, and in addition to the resin outer surface of the molded product. The insert member may be exposed. For these reasons, the yield of molded products has been deteriorated.

Japanese Patent No. 4576212

  As shown in FIGS. 5 to 11, conventionally, as shown in FIGS. 5 to 11, the insert member 60 as shown in FIG. 12 is fastened inside the resin without being exposed to the outer surface of the resin 72. In the molding die (lower die) 100 having an operating core such as a holding pin 110 that slides to float the insert member 60 from the die surface, first, the holding pin 110 is as shown in FIG. As shown in FIG. 7, the insert member 60 is set on the upper surface of the tip of the holding pin 110. At this time, the insert member 60 is in a floating state without contacting the surface of the cavity 101 except for the portion in contact with the holding pin 110.

  Next, as shown in FIG. 8, the mold (upper mold) 103 and the lower mold 100 are clamped. Even in this state, the insert member 60 is in the cavity 101 and is not in contact with the surface of the upper mold 103.

  Next, the resin melted by the molding machine is continuously filled into the cavity 101 from the gate 102 of the mold as shown in FIG.

  Here, the main process for injection molding by the injection molding machine is to first heat the resin pellets and pre-set the “metering” process to store the preset molten resin (the amount required to fill the resin in the mold) There is. At this time, the screw position of the molding machine is generally used as a measure of the amount of accumulated resin. The accumulated screw position is also used as the injection start position.

  Next, the mold clamping operation is started from the state where the mold is opened, and the mold closing is completed by closing the mold to a preset position (FIG. 8). Next, the molten resin in the screw is poured into the cavity from the gate side of the mold. First injection process in which a preset molten resin is filled within approximately 80% to 99% of the cavity volume (the process is generally known to those skilled in the art, although the notation varies depending on the manufacturer of the molding machine) In recent years, speed control has been adopted mainly by servo motors).

  In addition, a secondary injection process that fills the remaining space with molten resin and replenishes the shortage caused by resin shrinkage in the cavity (also widely used as a pressure-holding process. Also used mainly as pressure control. ) (FIG. 9).

  Here, it is mainly used to set the timing of switching between the primary injection and the secondary injection according to the passing position of the screw during filling. This passing position, that is, the switching position is generally referred to as a V (speed) -P (pressure) switching position or a secondary injection switching position. Moreover, the time which combined the said primary injection and secondary injection is preset, and it is called injection time. As the injection time increases, the molding machine shifts from the filling process to the cooling process (FIG. 11).

  The molding machine starts the weighing process again in preparation for the next filling. Note that the metering process is usually set in advance so as to be completed within the cooling time.

  The cooling process is timed up with a preset cooling time, and the process proceeds to a mold opening / closing process. After the mold is opened to a preset position, the mold opening process is completed. Next, as shown in FIG. 12, an extrusion process for taking out the molded product 90 from the mold (lower mold) is performed, and a series of molding is completed.

  Here, as a method of molding without exposing the insert member 60 to the outer surface of the resin, as shown in FIG. 9, as shown in FIG. The holding pin 110 is moved backward 112 in the mold. At the same time, a space 80 is instantaneously generated in the cavity 101 by the backward movement 112 of the holding pin 110. At this time, since the resin 70 in the cavity 101 is in a molten state, the space 80 is filled with the molten resin 70 to be further filled. Thereby, the molded product 90 in which the insert member 60 is not exposed to the outer surface of the resin 72 is formed.

  Conventionally, the timing of the backward movement 112 of the holding pin 110 is performed at a preset elapsed time 18 from 9 at the start of injection of the molding machine filling the molten resin 70, as shown in FIG. However, the filling time of the molten resin 70 varies due to various factors such as the viscosity of the resin, the flow resistance in the molding machine screw and the mold, and the influence of the outside air temperature. Originally, performing at a preset elapsed time 18 from the start of injection 9 is intended to cause the holding pin 110 to retreat 112 assuming that a certain amount of molten resin 70 is filled in the cavity 101. However, as described above, due to variations in the filling time of the molten resin 70, as shown in FIGS. 13 to 17, the assumed resin volume is insufficient or excessive.

  In addition, if the resin volume 70a filled with respect to the assumed resin volume 70 is insufficient, the remaining filled resin volume increases, so that a large amount of deformation stress is applied to the insert member 60 from the flow of the remaining filled resin, and the insert member 60 is It will be molded in the deformed state. As a result, after the mold was taken out, there was a problem that the insert member 60 was exposed 61 on the resin outer surface of the molded product. On the contrary, when an excessive resin volume 70b is filled with respect to the assumed resin volume 70, the remaining filled resin volume is reduced, so that the flow of the filled resin is small and the space 80 of the holding pin mark remains in the molded product. In addition, there was a problem that the insert member was exposed 80 on the resin outer surface of the molded product. In any case, the yield of the molded product was deteriorated.

  The present invention provides a control device that enables repeated filling of the molten resin 70 in a stable manner so as not to cause shortage or excess of the molten resin 70 and a method for manufacturing the same, thereby improving the yield of molded products. is there.

  In order to achieve the above object, in the present invention, as insert molding for retaining the insert member inside the resin without exposing the insert member to the outer surface of the resin, a holding pin for floating the insert member from the mold in advance and an operating core interlocking with the holding pin are provided. In a floating molded product in which an embedded mold is used, the holding pin and the operating core are retracted in the middle of resin filling, and the space of the pin mark remaining on the resin surface is filled with the remaining filling resin as the holding pin is retracted, Control the retraction of the holding pin and the operating core by outputting the V (speed) -P (pressure) switching position of the molding machine (secondary injection switching position as another notation) as an output signal from the molding machine to control the floating molding. On the control device side, the output signal is taken as an input signal, and a float forming control device that outputs a backward signal to the holding pin and the operating core by this input signal.

  In the float forming control device, the V (speed) -P (pressure) switching position (secondary injection switching position as another notation) of the molding machine is 80% to 99% of the total resin amount filled in the mold. Set in the% range, output the switching position as an output signal from the molding machine, take in the output signal as an input signal on the control device side that controls the float forming, and retract to the holding pin and the operating core with this input signal A float forming control device that outputs a signal was used.

  Further, in any of the float forming control devices, the V (speed) -P (pressure) switching position of the molding machine (secondary injection switching position as another notation) is output as an output signal from the molding machine, and the float forming is performed. On the control device side that controls the output, the output signal is taken as an input signal, and the internal delay timer is operated by the control device that controls the float forming by this input signal, and when the internal delay timer expires, the holding pin and the operating core are A float forming control device that outputs a backward signal is provided.

  In any of the float forming control devices, a plurality of operating cores are simultaneously controlled, and an internal delay timer is operated for each operating core, and when the internal delay timer expires, a backward signal is sent to each operating core. Was used as a float forming control device.

  Next, as an insert molding that keeps the insert member inside the resin without exposing it to the outer surface of the resin, a mold in which a holding pin that floats the insert member from the mold in advance and an operating core that works in conjunction with this holding pin is used, In the floating molded product in which the holding pin and the operating core are retracted while the resin is being filled, and the space of the pin mark remaining on the resin surface is filled with the remaining filling resin as the holding pin is retracted, the retracting control of the holding pin and the operating core is performed. Is output as an output signal from the molding machine, and the output signal is taken as an input signal on the control device side that controls the floating molding, and a backward signal is output to the holding pin and the operating core by this input signal. A float forming control device was used.

  Further, in the float molding control device, the screw position of the molding machine is set in the range of 80% to 99% of the total resin amount filled in the mold, and the switching position is output as an output signal from the molding machine, On the control device side for controlling the float forming, the output signal is taken as an input signal, and the float forming control device is configured to output a backward signal to the holding pin and the operating core by this input signal.

  Further, in any one of the float forming control devices, a plurality of actuating cores are controlled simultaneously, and the screw position of the molding machine is fetched as an input signal for each actuating core, and a retraction signal is output to each actuating core. A molding control device was obtained.

  Furthermore, it was set as the float molding control method for manufacturing the insert molded product which hold | maintained inside the resin, without exposing an insert member to the outer surface of resin.

  According to the float molding control apparatus or method of the present invention, it is inexpensive and is performed without retracting the insert member to the outer surface of the resin by retracting the holding pin into the mold in the middle of filling the cavity with a certain amount of molten resin. As molding, it is possible not to cause shortage or excess of the molten resin resulting from the variation in the backward timing, and it is possible to stably and repeatedly stabilize the backward timing, thereby improving the yield of molded products.

1 is a block diagram showing the essential parts of a first embodiment of a float forming control apparatus according to the present invention. The block diagram of the main part of the conventional float forming control apparatus is shown. The principal part block diagram of Example 2 of the float forming control apparatus which concerns on this invention is shown. The block diagram of the main part of the float forming control apparatus according to the third embodiment of the float forming control apparatus of the present invention is shown. The cross section of the molding die for manufacturing an insert molded article is shown. Sectional drawing of the shaping | molding die in the state which made the holding pin 110 advance is shown. Sectional drawing of the shaping die in the state which set the insert member is shown. Sectional drawing of the shaping die which clamps a mold die (upper die) and a lower die is shown. Sectional drawing of the shaping | molding die in the state with which the fuse | melted resin was filled is shown. Sectional drawing of the shaping | molding die which made the holding | maintenance pin reversely move in a metal mold | die is shown. Sectional drawing of the shaping | molding die at the time of transfering from a filling process to a cooling process is shown. Sectional drawing of the insert molding product which wraps a float molding manufacturing apparatus and an insert member with resin is shown. Sectional drawing of the floating mold when the filled resin volume is insufficient is shown. Sectional drawing of the insert floating mold which the insert member has deform | transformed by secondary injection is shown. Sectional drawing of the molded article which the insert member deform | transformed is shown. Sectional drawing of the shaping | molding die which made the holding pin retreat in a metal mold | die when the resin volume with which it filled is excessive is shown. Sectional drawing of the molded article which the insert member exposed is shown. Sectional drawing of the shaping die in the state which provided two holding pins and set the insert member is shown. A sectional view of a floating mold in a state where two holding pins are provided, a molten resin is filled, and the first holding pin is moved backward is shown. FIG. 4 is a cross-sectional view of a floating mold in a state where the second holding pin is moved backward after the first holding pin is moved backward. Sectional drawing of the floating mold of Example 2 is shown. Sectional drawing of the float-molding manufacturing apparatus provided with two holding pins and the insert molded product which wraps an insert member with resin is shown. Sectional drawing of the insert molded product which wraps an insert member with resin is shown (when two holding pins are provided). The block diagram of the main part of the float forming control apparatus of Embodiment 4 of the float forming control apparatus according to the present invention is shown.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

[Example 1]
FIG. 1 is a block diagram of essential parts shown as a first embodiment of a float forming control apparatus according to the present invention.
Fig. 1 shows output from the molding machine as output signals of the mold opening completion position 6, the mold closing completion position 7, and the VP switching position 8 (secondary injection switching position as another notation). input. Note that predetermined numerical values are input to the mold opening completion position 6, the mold closing completion position 7, and the VP switching position 8.

  In the float forming control device, an output signal for causing the operating core 1 to move forward 11 is output in response to the input signal at the mold opening completion position 6, and the operating core 1 is moved backward according to the input signal at the VP switching position 8. Control 10 to be performed.

  Further, here, in order to optimize the timing of the forward movement 11 and the backward movement 15 of the operating core 1 and improve the accuracy, delay timers 12, 14, and 16 are individually incorporated in the control device. In the first embodiment, the delay timer 16 is activated by the input signal at the VP switching position 8 and the control 10 is made to move the operating core 1 backward 15 after the time is up (after 0.10 sec).

  Here, since the mold opening completion position 6 is selected by the backward input signal of the operating core 1, the forward operation 13 of the operating core 1 is not selected by the input signal of the mold closing completion position 7. The numerical values for the mold opening completion position 6, the mold closing completion position 7, the VP switching position 8, the selection of input signals for the forward movement of the core 1, the backward movement of the core 1, and the individual delay timer values are as follows: 1 are not limited to those shown in FIG. 1, and appropriate numerical values and selections can be set in advance according to the mold shape, product shape, insert member, and the size and shape of each.

  Next, a manufacturing method using the float forming control apparatus according to FIG. 1 will be described below with reference to FIGS.

  As shown in FIG. 5 to FIG. 11, a cavity 101, a gate 102, and particularly a manufacturing method of an insert molded product 90 that holds the insert member 60 as shown in FIG. 12 inside the resin 72 without exposing it to the outer surface of the resin 72. In a molding die (lower die) 100 having an operating core such as a holding pin 110 that slides to float the insert member 60 from the die surface, first, as shown in FIG. The insert member 60 is set on the top surface of the tip of the holding pin 110 as shown in FIG. At this time, the insert member 60 is in a floating state without contacting the surface of the cavity 101 except for the portion in contact with the holding pin 110.

  Next, as shown in FIG. 8, the mold clamping operation is started from the state where the mold is open, and the mold closing is completed by closing the mold to a preset position. Even in this state, the insert member 60 does not contact the surface of the cavity 101 of the upper mold 103 and has a space.

  Next, as shown in FIG. 9, the resin melted by the molding machine is continuously filled into the cavity 101 from the gate 102 of the mold.

  Here, the main process of injection molding by the injection molding machine is to first apply heat to the resin pellets and store the molten resin set in advance (the amount required to fill the resin in the mold). There is a process. At this time, the screw position of the molding machine is generally used as a measure of the amount of accumulated resin. The accumulated screw position is also used as the injection start position.

  Next, as described above, after the mold mold (upper mold) 103 and the lower mold 100 are clamped (FIG. 8), the molten resin in the screw is poured into the cavity from the gate side of the mold. First injection that fills a preset molten resin within about 80% to 99% of the cavity volume (notation varies depending on the molding machine manufacturer, but it is a process name generally known to experts. In recent years, speed control has been adopted mainly by servo motors).

  In addition, secondary injection that fills the remaining space with molten resin and replenishes the shortage caused by resin shrinkage in the cavity (also widely used as a pressure-holding process. Also used mainly as pressure control. ) Start the process (FIG. 9).

  Here, as the switching between the primary injection and the secondary injection, setting based on the passing position of the screw during filling is mainly used. This passage position, that is, the switching position is generally expressed as a V (speed) -P (pressure) switching position or a secondary injection switching position. It is also widely known that a time obtained by combining the primary injection and the secondary injection is set in advance and used as the injection time. As the injection time increases, the molding machine shifts from the filling process to the cooling process (FIG. 11).

  At the same time, the molding machine starts the weighing process again in preparation for the next filling. Note that the metering process is usually set in advance so as to be completed within the cooling time. The cooling process is timed up with a preset cooling time, and the process proceeds to a mold opening / closing process. After the mold is opened to a preset position, the mold opening process is completed.

  Next, as shown in FIG. 12, an extrusion process for taking out the molded product 90 from the mold (lower mold) is performed, and a series of molding is completed.

  Here, as a method of performing molding without exposing the insert member 60 to the outer surface of the resin, as shown in FIG. 9, while the cavity 101 is filled with a certain amount of molten resin 70, as shown in FIG. 110 is retracted 112 into the mold. At the same time, a space 80 is instantaneously generated in the cavity 101 due to the retreat 112. At this time, since the resin 70 in the cavity 101 is in a molten state, the space portion 80 is filled with the molten resin 72 to be further filled. As a result, the molded product 90 in which the insert member 60 is not exposed to the outer surface of the resin 72 is formed.

  Here, conventionally, as shown in FIG. 2, the timing of the backward movement 112 of the holding pin 110 is performed at a preset elapsed time 18 from the start 9 of injection of the molding machine filling the molten resin 70.

  However, the time required for filling the molten resin 70 varies due to various factors such as the viscosity of the resin, the flow resistance in the molding machine screw and the mold, and the influence of the outside air temperature.

  Originally, performing at a preset elapsed time 18 from the start of injection 9 is intended to retract the holding pin 110 112 assuming that a certain amount of molten resin 70 is filled in the cavity 101. However, as described above, due to variations in the filling time of the molten resin 70, as shown in FIGS. 13 to 17, the assumed resin volume is insufficient or excessive.

  In addition, when the filled resin volume 70a is insufficient to the assumed resin volume 70, the remaining filled resin volume increases, so that a large amount of deformation stress is applied to the insert member 60 from the flow of the filled resin, and the insert member 60 is deformed 61. Will be molded. As a result, after the mold is taken out, a defective product 91 in which the insert member 60 is exposed 61 on the resin outer surface of the molded product is generated.

  On the contrary, if the filled resin volume 70b is larger than the assumed resin volume 70, the remaining filled resin volume is reduced, so the flow of the filled resin is small, and the space 80 of the retaining pin remains in the molded product. As a result, a defective product 92 in which the insert member is exposed to the resin outer surface of the molded product is generated. In any case, the yield of the molded product was deteriorated.

  In order not to cause the shortage or excess of the molten resin 70, in the first embodiment, the insert member 60 is fixed in advance to the mold 100, 103 as insert molding in which the insert member 60 is held inside the resin without being exposed to the outer surface of the resin 72. The molds 100 and 103 in which the holding pin 110 to be floated from above and the operating core 1 linked to the holding pin 110 are incorporated are used.

  Floating molding in which the holding pin 110 and the operating core are moved backward 112 during the filling of the resin 70, and the pin mark space 80 remaining on the resin surface is filled with the remaining filled resin 72 in accordance with the backward movement 112 of the holding pin 110. In the product 90, the holding pin 110 and the retracting operation 112 of the operating core 1 are controlled, and the molding machine V (speed) -P (pressure) switching position 8 (secondary injection switching position as another notation) is molded. The output signal is output as an output signal, and the control device that controls the float forming takes the output signal as an input signal. The delay timer 16 is activated by this input signal, and after the time is up (after 0.10 sec), the holding pin 110 And a float forming control device that outputs a signal of the backward movement 112 to the operating core 1.

  Further, in the float molding control device, the V (speed) -P (pressure) switching position 8 (secondary injection switching position as another notation) of the molding machine is 80% to 80% of the total resin amount filled in the mold. The 99% range is set, the switching position 8 is output as an output signal from the molding machine, and the control device that controls the float forming takes the output signal as an input signal. With this input signal, the holding pin 110 and A float forming control device that outputs a signal of the backward movement 112 to the operating core 1 is provided.

  In any one of the float forming control devices, the V (speed) -P (pressure) switching position 8 (secondary injection switching position as another notation) of the molding machine is output as an output signal from the molding machine, and the float is controlled. On the control device side that controls molding, the output signal is taken as an input signal, and the internal delay timer 16 is operated by the control device that controls float molding by this input signal. And a float forming control device that outputs a signal of the backward movement 112 to the operating core 1.

  With the above float forming control, the molten resin 70 and 72 are filled and the timing of the holding pin 110 and the retracting operation 112 of the operating core 1 is accurately performed, enabling repeated and stable float forming, and improving the yield of molded products. be able to.

[Example 2]
FIG. 3 shows a block diagram of the essential points of the embodiment 2 of the float forming control apparatus according to the present invention.
In FIG. 3, the control device controls two operating cores simultaneously. From the molding machine, output is made as output signals of the mold opening completion position 6, the mold closing completion position 7, and the VP switching position 8 (secondary injection switching position as another notation), and the float molding control apparatus inputs it as an input signal. Note that predetermined numerical values are input to the mold opening completion position 6, the mold closing completion position 7, and the VP switching position 8.

  In the operating core 1, an output signal for causing the operating core 1 to move forward 11 is output by the input signal at the mold opening completion position 6, and the operating core 1 is moved backward by the input signal at the VP switching position 8. Control 10 to be performed.

  Further, here, in order to optimize the timing of the forward movement 11 and the backward movement 15 of the operating core 1 and improve the accuracy, delay timers 12, 14, and 16 are individually incorporated in the control device. The delay timer 16 is actuated by the input signal at the VP switching position 8 and the control 10 is made to move the actuating core 1 backward 15 after the time is up (after 0.10 sec).

  In the operating core 2, the output signal for moving the operating core 2 forward 23 is output by the input signal at the mold closing completion position 7, and the operating core 2 is moved back 25 by the input signal at the VP switching position 8. 20.

  Further, here, in order to optimize the forward 23 and backward 25 timings of the operating core 2 and improve the accuracy, delay timers 22, 24, and 26 are individually incorporated in the control device. The delay timer 26 is activated by the input signal at the VP switching position 8 and the control 20 is made to move the operating core 2 backward 25 after the time is up (after 0.15 sec).

  Selection of numerical values for the mold opening completion position 6, mold closing completion position 7, VP switching position 8, input signals for the core 1 and core 2 forward movement, and the core 1 and core 2 reverse movement The individual delay timer values are not limited to those shown in FIG. 3, and appropriate values and selections are set in advance according to the mold shape, product shape, insert member, and the size and shape of each. Can do.

Next, a manufacturing method using the float forming control apparatus according to FIG. 3 will be described below with reference to FIGS.
As shown in FIGS. 18 to 21, the insert member 60 as shown in FIG. 22 is secured to the inside of the resin 72 without being exposed to the outer surface of the resin 72. In the molding dies 100 and 103 having operating cores such as the holding pin 110 and the holding pin 120 that slide to float the insert member 60 from the die surface, the holding pin 110 and the holding pin 120 are advanced to the cavity 101. The insert member 60 is set on the top surfaces of the holding pins 110 and the front ends of the holding pins 120. At this time, the insert member 60 is in a floating state without contacting the surface of the cavity 101 except for the portions that are in contact with the holding pin 110 and the holding pin 120.

  Next, as shown in FIG. 19, the resin melted by the molding machine is continuously filled into the cavity 101 from the gate 102 of the mold. Here, as a method of performing molding without exposing the insert member 60 to the outer surface of the resin, as shown in FIG. 19, the holding pin 110 is retracted into the mold while a certain amount of molten resin 70 is filled into the cavity 101. Operation 112 is performed. At the same time, a space 80 is instantaneously generated in the cavity 101 by the backward movement 112. At this time, since the resin 70 in the cavity 101 is in a molten state, the molten resin 71 to be further filled fills the space portion 80 as shown in FIG.

  At this time, the holding pin 120 is moved backward 122 with a slight delay from the timing of the backward movement 112 of the holding pin 110. At the same time, a space 81 is instantaneously generated in the cavity 101 by the backward movement 122. At this time, since the resin 71 in the cavity 101 is in a molten state, the molten resin 72 to be further filled fills the space portion 81 as shown in FIG.

  Thus, the insert member 60 forms a molded product 90 as shown in FIG. 22 that is not exposed to the outer surface of the resin 72.

  In the second embodiment, as insert molding for retaining the insert member 60 inside the resin without exposing the insert member 60 to the outer surface of the resin 72, the holding pins 110 and 120 for floating the insert member 60 from the molds 100 and 103 in advance, the holding pins 110 and 120 The molds 100 and 103 in which the operating cores 1 and 2 interlocked with the motor were incorporated were used.

  In the floating molded article 93 in which the holding pin 110 and the operating core 1 are retracted 112 during the filling of the resin 70 and the space 80 of the pin mark remaining on the resin surface is filled with the remaining filling resin 71 as the holding pin 110 is retracted 112. The retraction control of the holding pin 110 and the operating core 1 is performed by outputting the V (speed) -P (pressure) switching position 8 (secondary injection switching position as another notation) of the molding machine as an output signal, The control device that controls the float forming takes the output signal as an input signal, and the delay timer 16 is activated by this input signal. After the time is up (after 0.10 sec), the holding pin 110 and the operating core 1 are retracted. A float forming control device that outputs 112 signals was used.

  Further, the holding pin 120 and the operating core 2 are moved backward 122 during the filling of the resin 71 slightly behind the timing of the backward movement 112 of the holding pin 110, and a pin mark space 81 remaining on the resin surface as the holding pin 120 moves backward 122. In the floating molded product 93 in which the remaining filling resin 72 is filled, the retraction control of the holding pin 120 and the operating core 2 is performed using the V (speed) -P (pressure) switching position 8 (secondary injection as another notation). The switching position is output as an output signal from the molding machine, and the control device that controls the float forming takes the output signal as an input signal. The delay timer 26 is activated by this input signal, and the time is up (after 0.15 sec) After that, the float forming control device which outputs the backward 122 signal to the holding pin 120 and the operating core 2 was obtained.

  In the float forming control device, the V (speed) -P (pressure) switching position 8 (secondary injection switching position as another notation) of the molding machine is 80% to 99% of the total resin amount filled in the mold. In the control range that controls the float forming, the output signal is captured as an input signal, and the input signal is used to hold the holding pins 110 and 120. A float forming control device that outputs the backward 112 and 122 signals to the operating cores 1 and 2 is provided.

  The above-described float forming control enables the repeated filling and stable float forming of the molten resin 70, 71, 72 and the timing of the retraction 112, 122 of the holding pins 110, 120 and the operating cores 1, 2 with high accuracy. The yield can be improved.

[Example 3]
FIG. 4 is a block diagram of essential parts shown as Example 3 of the float forming control apparatus according to the present invention.
In the present block diagram 4, it is a control device that simultaneously controls five operating cores. From the molding machine, output is made as output signals of the mold opening completion position 6, the mold closing completion position 7, and the VP switching position 8 (secondary injection switching position as another notation), and the float molding control apparatus inputs it as an input signal. Note that predetermined numerical values are input to the mold opening completion position 6, the mold closing completion position 7, and the VP switching position 8.

  In the operating core 1, an output signal for moving the operating core 1 forward 11 is output by the input signal at the mold opening completion position 6, and the operating core 1 is moved back 15 by the input signal at the VP switching position 8. It was set to 10.

  Further, here, in order to optimize the forward 11 and reverse 15 timing of the operating core 1 and improve the accuracy, delay timers 12, 14, and 16 are individually incorporated in the control device. The delay timer 16 is actuated by the input signal at the VP switching position 8 and the control 10 is made to retract the actuating core 1 after the time is up (after 0.10 sec).

  In the operating core 2, the output signal for moving the operating core 2 forward 23 is output by the input signal at the mold closing completion position 7, and the operating core 2 is moved back 25 by the input signal at the VP switching position 8. 20.

  Further, here, in order to optimize the forward 23 and backward 25 timing of the operating core 2 and improve the accuracy, delay timers 22, 24 and 26 are individually incorporated in the control device. The delay timer 26 is actuated by the input signal at the VP switching position 8 and the control 20 is made to move the actuating core 2 backward 25 after the time is up (after 0.15 sec).

  In the operating core 3, an output signal for moving the operating core 3 forward 31 is output by the input signal at the mold opening completion position 6, and the operating core 3 is moved back 35 by the input signal at the VP switching position 8. 30.

  Further, here, in order to optimize the forward 31 and reverse 35 timing of the operating core 3 and improve the accuracy, delay timers 32, 34 and 36 are individually incorporated in the control device. The delay timer 36 is operated by the input signal at the VP switching position 8 and the control 30 is made to move the operating core 3 backward 35 after the time is up (after 0.20 sec).

  In the operating core 4, an output signal for moving the operating core 4 forward 43 is output by the input signal at the mold closing completion position 7, and the operating core 4 is moved back 45 by the input signal at the VP switching position 8. 40.

  Further, here, in order to optimize the forward 43 and backward 45 timing of the operating core 4 and improve the accuracy, delay timers 42, 44 and 46 are individually incorporated in the control device. The delay timer 46 is operated by the input signal at the VP switching position 8 and the control 40 is made to move the operating core 4 backward 45 after the time is up (after 0.25 sec).

  In the operating core 5, an output signal for causing the operating core 5 to move forward 51 is output by the input signal at the mold opening completion position 6, and the operating core 5 is moved back 55 by the input signal at the VP switching position 8. 50.

  Further, here, in order to optimize the forward 51 and backward 55 timings of the operating core 5 and improve the accuracy, delay timers 52, 54 and 56 are individually incorporated in the control device. The delay timer 56 is operated by the input signal at the VP switching position 8 and the control 50 is made to retract 55 the operating core 5 after the time is up (after 0.30 sec).

  The numerical values for the mold opening completion position 6, the mold closing completion position 7, the VP switching position 8, the selection of input signals for the cores 1 to 5 forward and the cores 1 to 5 backward, and the individual delay timer values are as follows: It is not limited to what is described in FIG. 4, and appropriate numerical values and selections can be set in advance depending on the mold shape, product shape, insert member, and the size and shape of each.

Next, a manufacturing method using the float forming control apparatus according to this block diagram 4 will be described below.
As a method of manufacturing an insert-molded product that keeps the insert member inside the resin without exposing it to the outer surface of the resin, there are five holding pins that slide to float the insert member from the mold surface, especially the cavity and gate. In a molding die having an operating core, the holding pins (5) are advanced to the cavity, and the insert member is set on the top surface of the tip of the holding pins (5). At this time, the insert member is in a state of floating without contacting the cavity surface except for the part in contact with the holding pins (five).

Next, the resin melted by the molding machine is continuously filled into the cavity from the gate of the mold.
Here, as a method of performing molding without exposing the insert member to the outer surface of the resin, the delay timers 16, 26, 36, 46, 56 are sequentially installed with holding pins (five) in the middle of filling the cavity with a certain amount of molten resin. Operate, time is up and then retracted into the mold. At the same time, a space is generated instantaneously and sequentially in the cavity due to the retreat.

At this time, since the resin in the cavity is in a molten state, the space portions are sequentially filled with the molten resin to be further filled.
Thus, a molded product in which the insert member is not exposed to the resin outer surface is formed.

  In the float forming control device, the V (speed) -P (pressure) switching position 8 (secondary injection switching position as another notation) of the molding machine is 80% to 99% of the total resin amount filled in the mold. Set in the% range, output the switching position 8 as an output signal from the molding machine, take the output signal as an input signal on the control device side that controls the float forming, and hold pins (5 pins) with this input signal The float forming control device outputs a backward signal to the operating cores 1 to 5.

  By the above-described float forming control, the molten resin filling and the retraction timing of the holding pins (5) and the operating cores 1 to 5 can be performed repeatedly and stably, and the float can be stably formed, and the yield of the molded product can be improved.

[Example 4]
FIG. 23 is a block diagram of essential parts shown as Example 4 of the float forming control apparatus according to the present invention.
FIG. 23 shows a control device that simultaneously controls five operating cores. A mold opening completion position 6, a mold closing completion position 7, and screw positions 19, 29, 39, 49, 59 are output from the molding machine, and the float forming control apparatus inputs them as input signals. Note that predetermined numerical values are input to the mold opening completion position 6, the mold closing completion position 7, and the screw positions 19, 29, 39, 49, 59.

  In the operating core 1, a control 10 for outputting an output signal for causing the operating core 1 to move forward 11 by the input signal of the mold opening completion position 6 and for causing the operating core 1 to move backward 15 by the input signal of the screw position 19. It was.

  In the operating core 2, an output signal for causing the operating core 2 to move forward 23 by the input signal at the mold closing completion position 7 is output, and a control 20 for causing the operating core 2 to move backward 25 by the input signal of the screw position 29. It was.

  In the operating core 3, an output signal that causes the operating core 3 to move forward 31 by the input signal of the mold opening completion position 6 is output, and a control 30 that causes the operating core 3 to move backward 35 by the input signal of the screw position 39. It was.

  In the operating core 4, an output signal that causes the operating core 4 to move forward 43 by the input signal of the mold closing completion position 7 is output, and a control 40 that causes the operating core 4 to move backward 45 by the input signal of the screw position 49. It was.

  In the operating core 5, an output signal that causes the operating core 5 to move forward 51 by the input signal at the mold opening completion position 6 is output, and a control 50 that causes the operating core 5 to move backward 55 by the input signal at the screw position 59. It was.

  In addition, selection of numerical values to the mold opening completion position 6, mold closing completion position 7, screw positions 19, 29, 39, 49, 59, input signals for the core 1-5 forward movement, and the core 1-5 reverse movement The individual delay timer values are not limited to those shown in FIG. 23, and appropriate values and selections are set in advance according to the mold shape, product shape, insert member, and the size and shape of each. Can do.

Next, a manufacturing method using the float forming control apparatus shown in FIG. 23 will be described below.
As a method of manufacturing an insert-molded product that keeps the insert member inside the resin without exposing it to the outer surface of the resin, there are five holding pins that slide to float the insert member from the mold surface, particularly the cavity and gate. In the molding die provided with the operating core, the holding pins (5) are advanced to the cavity, and the insert member is set on the top surface of the tip of the holding pins (5). At this time, the insert member is in a floating state without being in contact with the cavity surface except for the portion in contact with the holding pins (five).

  Next, the resin melted by the molding machine is continuously filled into the cavity from the gate of the mold. Here, as a method of performing molding without exposing the insert member to the outer surface of the resin, the holding pins (five) are sequentially placed at screw positions 19, 29, 39, 49, and 59 while a certain amount of molten resin is filled in the cavity. Retract into the mold by signal. At the same time, a space is generated instantaneously and sequentially in the cavity due to the retreat. At this time, since the resin in the cavity is in a molten state, the space portions are sequentially filled with the molten resin to be further filled. Thus, a molded product in which the insert member is not exposed to the resin outer surface is formed.

  Further, in the float forming control device, the screw positions 19, 29, 39, 49, 59 of the molding machine are set to values within the range of 80% to 99% of the total resin amount filled in the mold. The screw positions 19, 29, 39, 49, 59 are outputted as output signals from the molding machine, and the output signal is taken as an input signal on the control device side which controls the float forming, and the holding pin (5 And a float forming control device that outputs a backward signal to the operating cores 1 to 5.

  According to the float forming control apparatus of the present invention, it is an inexpensive manufacturing method, and further, the above-described float forming control enables the filling of the molten resin and the retraction timing of one or more holding pins and each operating core to be performed more precisely and accurately. Thus, it is possible to repeatedly perform stable float forming, and to improve the yield of the molded product.

  As described above, the present invention provides a mold in which a holding pin for floating the insert member from the mold in advance and an operating core that is linked to the holding pin are incorporated as insert molding for retaining the insert member inside the resin without exposing the insert member to the outer surface of the resin. Used.

  The present invention also relates to an insert molded product that holds the insert member inside the resin without exposing the insert member to the outer surface of the resin, and a manufacturing method thereof.

  In particular, an airflow sensor that measures the inflow air amount in the automobile field, a throttle position sensor that adjusts the air amount, an accelerator opening sensor that adjusts the accelerator opening, an electromagnetic coil molded product in which an annular coil is embedded, and multiple metal products There are a wide variety of products such as bus bar molded products for inserting wiring boards and various sensors for controlling and configuring these insert molded products in series. In addition, any product that solves the problems of the present invention can be applied without being limited to the products listed above.

  Further, the float forming control device of the present invention may be in the form of either a control device separate from the control device of the molding machine or an integrated control device incorporated in the control device of the molding machine, and is an object of the present invention. There is no particular limitation as long as the float forming control is achieved.

  The present invention can be widely used for manufacturing an airflow sensor, a throttle position sensor, an accelerator opening sensor, and the like in the automobile field, and for manufacturing a plastic processed product using a resin or the like in other technical fields.

1, 2, 3, 4, 5 ... operating core, 6 ... mold opening completion position, 7 ... mold closing completion position, 8 ... VP switching position, 9 ... injection start,
10, 20, 30, 40, 50 ... operating core control,
11, 13, 15, 21, 23, 25, 31, 33, 35, 41, 43, 45, 51, 53, 55 ...
12, 14, 16, 22, 24, 26, 32, 34, 36, 42, 44, 46, 52, 54, 56 ... delay timer selection setting point,
19, 29, 39, 49, 59… delay timer setting point,
60 ... insert member, 61 ... deformed part, exposed part of insert member,
70, 70a, 70b, 71, 72 ... resin, 80, 81 ... space,
90, 91, 92, 93 ... insert molding, 99 ... screw position
100, 103 ... mold, 101 ... cavity, 102 ... gate,
110, 120 ... holding pin, 111, 112, 121, 122 ... holding pin (forward or backward) operation

Claims (12)

For insert molding that keeps the insert member inside the resin without exposing it to the outer surface of the resin, it has a floating mold in which a holding pin that floats the insert member from the mold in advance and an operating core that interlocks with the holding pin are incorporated, A control device for a floating molding machine that retracts the holding pin and the operating core during resin filling, and fills the space of the pin mark remaining on the resin surface with the remaining filling resin as the holding pin moves backward,
For the backward movement control of the holding pin and the operating core, the V (speed) -P (pressure) switching position or the secondary injection switching position of the molding machine is output as an output signal from the molding machine, and the output signal is used as an input signal. A float forming control apparatus that takes in and outputs a backward signal to the holding pin and the operating core based on the input signal. In the float forming control apparatus according to claim 1,
The V (speed) -P (pressure) switching position or the secondary injection switching position of the molding machine is set to a value within a range of 80% to 99% of the total resin amount filled in the mold. Floating molding control device. The float molding control device according to claim 1 or 2, further comprising an internal delay timer,
When the output signal from the V (speed) -P (pressure) switching position or the secondary injection switching position of the molding machine is taken as an input signal, the internal delay timer is activated, and the internal delay timer is timed up, A float forming control device that outputs a backward signal to the holding pin and the operating core. In the float forming control apparatus according to claim 1 or 2,
The holding pin and the operating core are composed of a plurality, and the control device includes an internal delay timer for each operating core, and each holding pin and each operating core are provided by the time-up of each internal delay timer. A float forming control device that outputs a backward signal. For insert molding that keeps the insert member inside the resin without exposing it to the outer surface of the resin, it has a floating mold in which a holding pin that floats the insert member from the mold in advance and an operating core that interlocks with the holding pin are incorporated, A control device for a floating molding machine that retracts the holding pin and the operating core during resin filling, and fills the space of the pin mark remaining on the resin surface with the remaining filling resin as the holding pin moves backward,
Retraction control of the holding pin and the operating core is performed by outputting the screw position of the molding machine as an output signal from the molding machine, taking the output signal as an input signal, and based on the input signal, the holding pin and the operating core Floating molding control device that outputs a reverse signal. In the float forming control apparatus according to claim 5,
The float molding control apparatus, wherein the screw position of the molding machine is set to a value within the range of 80% to 99% of the total amount of resin filled in the mold. The float molding control device according to claim 5 or 6, further comprising an internal delay timer,
When the output signal from the screw position of the molding machine is taken as an input signal, the internal delay timer is activated, and when the internal delay timer expires, a backward signal is output to the holding pin and the operating core. Floating molding control device. In the float forming control apparatus according to claim 5 or 6,
The holding pin and the operating core are composed of a plurality, and the control device includes an internal delay timer for each operating core, and each holding pin and each operating core are provided by the time-up of each internal delay timer. A float forming control device that outputs a backward signal. Using a molding machine including a holding pin that floats the insert member from the mold in advance and a floating molding die in which an operating core that is interlocked with the holding pin is incorporated, the holding pin and the operating core are retracted during resin filling, An insert molding method for retaining the insert member inside the resin without exposing it to the outer surface of the resin by filling the space of the pin trace remaining on the resin surface with the retraction of the holding pin with the remaining filling resin,
The backward movement control of the holding pin and the operating core is performed by sending a backward signal to the holding pin and the operating core based on the V (speed) -P (pressure) switching position, the secondary injection switching position, or the screw position of the molding machine. Floating molding control method to output. In the float forming control method according to claim 9,
The V (speed) -P (pressure) switching position or the secondary injection switching position of the molding machine is set to a value within a range of 80% to 99% of the total resin amount filled in the mold. Floating molding control method. In the float forming control method according to claim 9 or 10,
An internal delay timer is operated based on a V (speed) -P (pressure) switching position, a secondary injection switching position, or a screw position of the molding machine, and the holding pin and the operating core are activated when the internal delay timer expires. A float forming control method, wherein a reverse signal is output to In the float forming control method according to claim 9 or 10,
A plurality of internal delay timers are operated based on a V (speed) -P (pressure) switching position, a secondary injection switching position, or a screw position of the molding machine, and the plurality of internal delay timers are timed up. A float forming control method for outputting a backward signal to a plurality of holding pins and a plurality of operating cores.

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