JP4324083B2 - Liquid material injection molding equipment - Google Patents

Description

  The present invention relates to a liquid material injection molding apparatus that performs molding by injection filling a mold with a liquid material supplied from a material supply apparatus arranged outside.

  In general, an LIM type injection molding apparatus that exclusively molds a liquid material such as liquid silicone rubber is known. This type of injection molding apparatus is equipped with an injection device having a measuring unit and an injection unit, and supplies a liquid material to a measuring unit from a material supply device separately provided outside, and injects a fixed amount of liquid material measured by the measuring unit. The inside of the injection unit is supplied from a supply port provided in the unit. In this case, when using a plurality of liquid materials (two-component type, three-component type), a plurality of liquid materials are mixed by the mixing unit provided in the measuring unit and then supplied to the injection unit.

  By the way, recently, there is an increasing need for resin materials having properties such as elasticity and heat resistance, or resin materials with high transparency used for molding lenses, and accordingly, the viscosity of resin materials (liquid materials) has been lowered. Yes. The low-viscosity liquid material has the property of easily involving air (bubbles) when the material is supplied, and how to extract (degas) the air entrained in the liquid material is an important issue.

Conventionally, an injection molding machine disclosed in Japanese Patent Application Laid-Open No. 2000-158498 is known as an injection molding apparatus having such a defoaming function for extracting air. The injection molding machine disclosed in the same publication is provided with a liquid material pushing device on the upstream side of the injection device and provided with a liquid material pushing device. It comprises a pot to be communicated, a plunger that slidably moves in the pot, and a deaeration device for degassing the pot.
JP 2000-158498 A

  However, the above-described conventional liquid material injection molding machine (injection molding apparatus) has the following problems.

  First, since a separate deaeration device having an intake function such as a vacuum pump that draws air from the liquid material is required, the cost is significantly increased and the size of the device (equipment) is increased. Also inferior.

  Secondly, it is necessary to provide a separate degassing step in the molding cycle, so the loss of the molding cycle time becomes a bottleneck in shortening the molding cycle, and it is flexible to liquid materials with fast curing time. It is not possible to cope with it, and there is a risk of adverse effects.

  An object of the present invention is to provide a liquid material injection molding apparatus that solves the problems existing in the background art.

  The liquid material injection molding apparatus M according to the present invention includes an injection apparatus 2 having an injection part 3 for injecting and filling a liquid material R into a mold C, and the injection apparatus 2 is supplied with a liquid material R (Ra ...). In an injection molding apparatus including a material supply device 4 arranged outside, a supply port 3i for supplying the liquid material R to the injection unit 3 is attached to the rear portion 3r of the injection unit 3 and the lower side 3d of the injection unit 3. Thus, the measuring unit 11 that supplies the liquid material R measured to the suction port 3i, and the material supply pipe 12 that supplies the liquid material R (Ra ...) from the material supply device 4 to the measuring unit 11 from below. It has the material supply means 5 which has these.

  In this case, according to a preferred aspect of the invention, the metering unit 11 is provided with a backflow prevention valve 13a for preventing the backflow of the liquid material R (Ra ...), and the air present in the passage of the liquid material R (Ra ...). Can be provided to the outside. Further, the weighing unit 11 has a weighing main body 15 for weighing a plurality of liquid materials Ra, Rb... Supplied from a plurality of material supply devices 4... And a plurality of liquid materials supplied from the weighing main body 15. A mixing unit 16 that joins Ra and supplies it to the injection unit 3 can be provided. Furthermore, the injection part 3 can be arranged so as to be inclined upward.

  On the other hand, a liquid material injection molding apparatus M according to another embodiment of the present invention includes an injection apparatus 2 having an injection unit 3 for injecting and filling a liquid material R into a mold C, and the injection apparatus 2 includes a liquid material. In an injection molding apparatus including an external material supply device 4 for supplying R (Ra...), The injection portion 3 is disposed so as to be inclined forward and the liquid material R is supplied to the injection portion 3. 3i is provided on the lower side 3d of the injection unit 3, and the material supply means 5 for supplying the liquid material R to the injection unit 3 from below is provided.

  The liquid material injection molding apparatus M according to another embodiment of the present invention includes an injection apparatus 2 having an injection unit 3 for injecting and filling the liquid material R into the mold C, and the injection apparatus 2 includes the liquid material. In an injection molding apparatus including an external material supply device 4 for supplying R (Ra ...), a supply port 3i for supplying the liquid material R to the injection unit 3 is provided on the lower side 3d of the injection unit 3, and the injection unit 3 The material supply means 5 for supplying the liquid material R from below is provided, and the mold C is provided with a nozzle touch surface Ct offset downward from the center position Sc of the mold C. .

  Furthermore, the liquid material injection molding apparatus M according to another embodiment of the present invention includes an injection apparatus 2 having an injection portion 3 for injecting and filling the liquid material R into the mold C, and the injection apparatus 2 includes the liquid material. In an injection molding apparatus including an external material supply device 4 for supplying R (Ra ...), a supply port 3i for supplying the liquid material R to the injection unit 3 is provided on the lower side 3d of the injection unit 3, and the injection unit 3 The material supply means 5 for supplying the liquid material R from below is provided, and the mold plate 17 that supports the mold C is provided with a long locating hole 18 through which the injection part 3 is inserted. To do.

  Furthermore, the liquid material injection molding apparatus M according to another embodiment of the present invention includes an injection apparatus 2 having an injection portion 3 for injecting and filling the liquid material R into the mold C, and the injection apparatus 2 includes the liquid material. In an injection molding apparatus including an external material supply device 4 for supplying R (Ra ...), a supply port 3i for supplying the liquid material R to the injection unit 3 is provided on the lower side 3d of the injection unit 3, and the injection unit 3 The material supply means 5 for supplying the liquid material R from below is provided, and the mold 19 is provided with a cavity 19 that is offset upward from the center position Sc of the mold C.

  The liquid material injection molding apparatus M according to the present invention having such a configuration has the following remarkable effects.

  (1) Since the liquid material R is supplied from below to the inlet 3i of the injection unit 3, the liquid material R (Ra ...) reaching the injection unit 3 moves from the bottom to the top, and the low viscosity liquid material R ( The bubbles (air) mixed in Ra ...) float and are released from the liquid surface of the liquid material R (Ra ...), and the air is less likely to be caught in the liquid material R (Ra ...). Bubble mixing into the liquid material R (Ra ...) can be effectively avoided.

  (2) When avoiding mixing of bubbles in the liquid material R (Ra ...), it can be realized by a geometric layout configuration without using an additional device such as a deaeration device. (Equipment) can be reduced in size and can contribute to energy saving.

  (3) Since there is no need to provide a separate degassing step in the molding cycle, the molding cycle time can be shortened by eliminating the loss of molding cycle time, and it is possible to flexibly handle liquid materials with fast curing times. .

  (4) A liquid material R measured at the suction port 3i is provided by attaching a supply port 3i for supplying the liquid material R to the injection unit 3 at the rear 3r of the injection unit 3 and at the lower side 3d of the injection unit 3. The material supply device 4 includes a supply unit 5 and a material supply unit 5 having a material supply pipe 12 for supplying the liquid material R (Ra ...) from the material supply device 4 to the measurement unit 11 from below. This kind of general injection molding apparatus provided with the metering unit 11 can reduce the flow resistance and the air entrainment amount by shortening the distance between the metering unit 11 and simplifying the supply pipe path (lowering the position). However, the present invention can be easily applied.

  (5) The injection unit 3 is disposed so as to be inclined forward and a supply port 3i for supplying the liquid material R to the injection unit 3 is provided on the lower side 3d of the injection unit 3 so that the injection unit 3 is viewed from below. Since the material supply means 5 for supplying the liquid material R is provided, it is possible to realize discharge by rising of bubbles mixed (residual) in the liquid material R and prevention of air entrainment in the liquid material R.

  (6) The supply port 3i for supplying the liquid material R to the injection unit 3 is provided on the lower side 3d of the injection unit 3, and the material supply means 5 for supplying the liquid material R to the injection unit 3 from below is provided. Since the nozzle touch surface Ct that is offset downward from the center position Sc of the mold C is provided on the mold C, discharge due to floating of bubbles mixed (residual) in the liquid material R and prevention of air entrainment in the liquid material R Can be realized.

  (7) The supply port 3i for supplying the liquid material R to the injection unit 3 is provided on the lower side 3d of the injection unit 3, and the material supply means 5 for supplying the liquid material R to the injection unit 3 from below is provided. Since the mold placing plate 17 supporting the mold C is provided with a long locating hole 18 in the vertical direction through which the injection section 3 is inserted, it can flexibly cope with the injection device 2 arranged at various positions and angles. The versatility can be further improved.

  (8) The supply port 3i for supplying the liquid material R to the injection unit 3 is provided on the lower side 3d of the injection unit 3, and the material supply means 5 for supplying the liquid material R to the injection unit 3 from below is provided. The mold C is provided with a cavity 19 that is offset upward from the center position Sc of the mold C, so that air bubbles mixed in (residual) in the liquid material R are released by floating and prevention of air entrainment in the liquid material R is realized. it can.

  (9) According to a preferred embodiment, the liquid material R is supplied to the injection unit 3 from below if the metering unit 11 is provided with a backflow prevention valve 13a for preventing the backflow of the liquid material R (Ra ...). Even so, the liquid material R can be supplied stably and reliably.

  (10) According to a preferred embodiment, if the measuring part 11 is provided with an air vent part 14a for discharging the air present in the passage of the liquid material R (Ra ...) to the outside, the liquid material in the section reaching the measuring part 11 Air containing bubbles released from R (Ra...) Can be easily discharged.

  (11) According to a preferred embodiment, if the material supply means 5 including the material supply pipe 12s that supplies the injection unit 3 from below without measuring the liquid material Ra from the material supply device 4 to the injection unit 3 is adopted, separately. It is possible to easily construct a casting molding system that eliminates the need for a measuring section.

  Next, the best embodiment according to the present invention will be given and described in detail with reference to the drawings.

  First, the configuration of the injection molding apparatus M according to this embodiment will be described with reference to FIGS.

  The injection molding apparatus M includes a machine base Mb, and an injection apparatus 2 and a mold clamping apparatus Mc installed on the machine base Mb. The mold clamping device Mc includes a mold placement plate (fixed platen) 17 and a drive unit support plate (not shown) fixedly arranged at spaced positions on the machine base Mb, and between the mold placement plate 17 and the drive unit support plate. Four (see FIG. 2) tie bars 21 are erected. The movable plate 22 is slidably loaded on the tie bars 21. The movable plate 22 supports the movable mold Cm and the mold placing plate 17 supports the fixed mold Cc. A mold C is constituted by the movable mold Cm and the fixed mold Cc. The movable platen 22 is driven forward and backward by the drive unit supported by the drive unit support plate, whereby the mold C can be closed, clamped, and opened.

  Further, the fixed mold Cc of the mold C is provided with a nozzle touch surface (sprue bush) Ct offset downward from the center position Sc (see FIG. 6) of the mold C, and the cavity 19 of the mold C includes The mold C is provided at a position offset upward from the center position Sc. Therefore, one end of the sprue portion Cs in the mold C can face the center of the nozzle touch surface Ct, and the other end of the sprue portion Cs can face near the lower end of the cavity 19. At this time, the sprue portion Cs is desirably inclined so that the cavity 19 side is in the upper position. With such a configuration of the mold C, it is possible to secure a mode in which the liquid material R moves from the bottom to the top, so that the release of bubbles mixed in the liquid material R and the prevention of air entrainment in the liquid material R are realized. It is possible to effectively avoid the mixing of bubbles into the liquid material R.

  Further, as shown in FIG. 2, the mold platen 17 that supports the fixed mold Cc is inserted through the distal end side (injection nozzle 37) of the injection unit 3, which will be described later, and is allowed to be displaced in the vertical direction. A long locating hole 18 is provided in the direction. In general, the nozzle touch surface Ct is provided at the center position Sc of the mold C, and the injection portion 3 is disposed horizontally without being inclined. Therefore, such a locating hole 18 is usually provided in a circular shape. However, in the case of the mold C according to the present embodiment, the nozzle touch surface Ct is offset downward from the center position Sc of the mold C, and the injection unit 3 to be described later may be inclined and disposed. The locate hole 18 has a shape that is long in the vertical direction. Thereby, it can respond flexibly with respect to the injection apparatus 2 arrange | positioned at various positions and angles, and can improve versatility more.

  On the other hand, the injection device 2 is supported by an injection device moving mechanism 32 disposed on a pedestal 31 installed on the machine base Mb. The injection device moving mechanism 32 can move the injection device 2 forward (leftward in FIG. 1) or backward (rightward in FIG. 1), and can move to the nozzle touch position Xt shown in FIG. At the same time, the nozzle can be moved to the nozzle touch release position Xn (see FIG. 8) which is separated from the mold C by retreat.

  The injection device 2 includes an injection device drive unit 35 that is supported by legs 33 and 34 erected from the injection device moving mechanism 32, and the injection unit 3 projects from the tip of the injection device drive unit 35. The injection unit 3 includes a heating cylinder 36, and has an injection nozzle (shutoff nozzle) 37 at the tip of the heating cylinder 36. Each of the leg portions 33 and 34 can be adjusted in height, whereby the injection device 2 (injection portion 3) is disposed so as to be inclined forward. At this time, it is considered that the tip of the injection nozzle 37 is in pressure contact with the center of the nozzle touch surface Ct at the nozzle touch position Xt described above. By inclining the injection part 3 upward, as in the case of the mold C described above, it is possible to secure a mode in which the liquid material R moves from the bottom to the top. In addition, air entrainment prevention with respect to the liquid material R is realized, and the mixing of bubbles into the liquid material R can be effectively avoided. The heating cylinder 36 incorporates a screw that is rotated or moved back and forth by the injection device drive unit 35. The liquid material R is agitated by the rotation of the screw, and injection filling of the liquid material R into the mold C (cavity 19) is performed by the forward movement of the screw.

  Furthermore, a supply port 3 i (see FIG. 3) for supplying the liquid material R into the injection unit 3 is provided on the lower side 3 d of the injection unit 3 at the rear part 3 r of the injection unit 3. And the measurement part 11 which faces this inlet 3i is attached to the rear part 3r of the injection | pouring part 3, and is made to protrude below at right angle. As a result, the liquid material R can be supplied from the measuring unit 11 positioned below the inlet 3 i of the injection unit 3. The measuring unit 11 includes a mixing unit 16 that communicates with the injection unit 3 and a measuring main body unit 15 that communicates with the mixing unit 16. The measurement main body 15 measures two different types of liquid materials supplied from two material supply devices 4 to be described later, that is, the first liquid material Ra and the second liquid material Rb, respectively, to set amounts for one shot. The mixing unit 16 has a function of mixing the first liquid material Ra and the second liquid material Rb supplied from the measurement main body unit 15 and supplying them to the injection unit 3. In this way, when the material supply means 5 is configured, it is only necessary to turn the weighing unit 11 upside down. Therefore, the present invention can be easily applied to this type of injection molding apparatus having the weighing unit 11. it can.

  The configuration of the mixing unit 16 is shown in FIG. The mixing unit 16 includes a first inflow port 41a into which the first liquid material Ra supplied from the metering main body unit 15 flows in and a second inflow port 41b into which the second liquid material Rb flows in, and each of the inflow ports 41a and 41b includes The branch passages 42a and 42b formed inside communicate with one end of the branch passages 42a and 42b, respectively. Further, the other end of each branch passage 42a communicates with and joins to one end of a combined flow path 43 formed therein, and the other end of the combined flow path 43 serves as a feed inlet 3i that faces the injection unit 3 described above. .

  Furthermore, backflow prevention valves 13a and 13b for preventing backflow of the liquid materials Ra and Rb are attached to the inflow ports 41a and 41b. One backflow prevention valve 13a (the same applies to the other backflow prevention valve 13b) is constituted by a ball check valve, and includes a valve seat 45a using a seal ring, a ball valve 46a capable of contacting the valve seat 45a, A coil spring 47a is provided to urge the ball valve 46a in a direction in which the ball valve 46a comes into contact with the valve seat 45a. Thereby, at the time of metering, the ball valve 46a is pushed by the liquid material Ra that is fed and separated from the valve seat 45a against the elasticity of the coil spring 47a, and the backflow prevention valve 13a is opened, and at the time of non-metering The ball valve 46a is pressed against the valve seat 45a by the elasticity of the coil spring 47a or the pressure in the reverse direction, and the backflow prevention valve 13a is closed. Even if the liquid material R (Ra, Rb) is supplied to the injection unit 3 from below by providing such a backflow prevention valve 13a in the mixing unit 16 (metering unit 11), the liquid material R (Ra, Rb) can be supplied stably and reliably.

  In addition, air vents 14a and 14b for discharging air existing in the passages of the liquid materials Ra and Rb to the outside are provided at intermediate positions of the branch passages 42a and 42b. Each air vent 14a ... is provided with a cock that does not appear in the figure. When air is vented, each cock is opened to vent the air. When air is not vented, the cock is closed to shut off the air vent 14a ... To do. By providing such air vents 14a, air containing bubbles released from the liquid material R (Ra ...) can be easily discharged in the section reaching the measuring unit 11.

  On the other hand, by configuring separately from the main body of the injection molding apparatus M, two material supply apparatuses 4 arranged outside the main body of the injection molding apparatus M are provided. Each of the material supply devices 4 has a function of accommodating two different types of liquid materials Ra and Rb and supplying the liquid materials Ra and Rb to the weighing main body 15 described above. FIG. 1 shows only one material supply device 4. One material supply device 4 (the same applies to the other material supply device 4) includes a material tank 51 and a pressure feed pump 52 that pressure-feeds the liquid material Ra accommodated in the material tank 51 as main parts. The material discharge port 4 o of the material supply device 4 is connected to the measuring main body 15 via the material supply pipe 12. In this case, it is desirable that the material supply pipe 12 connects the material discharge port 4o and the measurement main body 15 at the shortest possible distance to avoid unnecessary detours.

  Accordingly, the material supply means 5 for supplying the liquid material R from below to the injection unit 3, that is, the rear portion 3r of the injection unit 3 and the lower side 3d of the injection unit 3 can be attached to the supply port 3i. By providing a measuring unit 11 for supplying the measured liquid material R and a material supply pipe 12 for supplying the liquid material R from the material supply device 4 to the measuring unit 11 from below, the measuring unit 11 is provided below the injection unit 3. The material supply means 5 for supplying the liquid material R from is configured.

  Next, the operation and function of the liquid material injection molding apparatus M according to the present embodiment will be described with reference to FIGS.

  First, the basic operation is as follows. The first liquid material Ra and the second liquid material Rb accommodated in each material supply device 4... Are pumped to the measuring body 15 through the material supply pipes 12. The measuring main body 15 measures the amount of one shot set for each of the liquid materials Ra and Rb and supplies it to the mixing unit 16 at the subsequent stage. In the mixing unit 16, the liquid materials Ra and Rb are mixed by being merged, and the mixed liquid material R is introduced into the injection unit 3 from below via a supply port 3 i disposed on the lower side of the injection unit 3. Supplied. In the injection unit 3, after the liquid material R is uniformly stirred by the rotation of the screw, the cavity 19 of the mold C is injected and filled by the forward movement of the screw, and known injection molding for the liquid material R is performed.

  On the other hand, the injection molding apparatus M according to the present embodiment includes the material supply means 5 that supplies the liquid material R, Ra,... A mode in which the materials R, Ra... Move from the bottom to the top is ensured. When the liquid materials Ra and Rb have a low viscosity, specifically, a low viscosity similar to that of water, the liquid material Ra and Rb have a property of easily involving air when the material is supplied. Release by the rising of bubbles mixed in R and prevention of entrainment of air into the liquid material R are realized. That is, bubbles (air) mixed in the liquid materials R, Ra,... Float up and are released from the liquid surface of the liquid materials R, Ra,... And the air is caught in the liquid materials R, Ra,. It becomes difficult and the bubble mixing with respect to liquid material R, Ra ... is avoided effectively.

  In this regard, if attention is paid to the material supply pipe 12, the material supply pipe 12 arranged in the vertical direction shown in FIG. 4 has a low viscosity (high fluidity) of the liquid materials R, Ra,. The tip A liquid level becomes almost horizontal, and the air A mixed in the liquid materials R, Ra... Is lifted by buoyancy and released from the tip liquid level, but the material supply arranged in the lateral direction shown in FIG. In the pipe 12, the air A mixed in the liquid materials R, Ra,... Cannot float, so that it is not discharged from the liquid materials R, Ra,. In addition, the tip liquid surface of the liquid material R, Ra,... Having a low viscosity (high fluidity) is in an inclined state, and it is easy to entrain the air A heading from the injection unit 3 side. 4 and 5, the arrow Ff indicates the moving direction (supply direction) of the liquid materials R, Ra.

  As described above, when the low-viscosity liquid materials R, Ra,... Are used, the passage formation of the liquid materials R, Ra,. FIG. 6 shows a schematic configuration of the injection molding apparatus M according to the present embodiment by a solid line, and also shows a schematic configuration of a general known injection molding apparatus Mr by a dotted line. In the injection molding apparatus Mr, 3r represents an injection section, 4or represents a material discharge port, 11r represents a metering section, 12r represents a material supply pipe, 16r represents a mixing section, and 35r represents an injection apparatus driving section. The injection molding apparatus M according to the present embodiment is provided with a supply port 3i for supplying the liquid material R to the injection unit 3 on the lower side 3d of the injection unit 3, and supplies the liquid material R to the injection unit 3 from below. Therefore, the flow resistance can be reduced by shortening the distance from the material supply device 4 to the measuring unit 11, and further simplifying (lowering the position) of the material supply pipe 12, and further increasing the amount of air entrained. Can be reduced.

  On the other hand, in a general injection molding apparatus Mr, in addition to the distance between the material supply device 4 and the measuring unit 11r becoming longer, the material supply pipe 12r connected to the measuring unit 11r is in a horizontal state or a material supply pipe. There is a possibility that the measuring unit 11r side in 12r may be lower than the intermediate position, and it is difficult for defoaming to occur, for example, air is easily caught. Although the material supply pipes 12 and 12r have been described above, the passages in the measuring units 11 and 11r are the same. In the injection molding apparatus M according to the present embodiment, the liquid material R is lowered by the material supply means 5. Since the mode of moving upward from the position is ensured, the mixing of bubbles into the liquid material R is effectively avoided.

  Incidentally, the presence of air usually becomes a problem when the liquid materials R, Ra,... Are first supplied from the material supply device 4 to the main body side of the injection molding device M at the time of molding. In this case, before the supply of the liquid materials R, Ra..., Air exists in the passage of the liquid materials R, Ra. Must be discharged to the outside. Therefore, at the time of molding, first, the liquid materials R, Ra,... Are supplied with the cocks in the air vents 14 a. Accordingly, as the liquid materials R, Ra,... Are supplied, the air in the passage is discharged to the outside through the air vents 14a. When the passages are filled with the liquid materials R, Ra,..., The cocks in the air vents 14a are closed. When supplying the liquid materials R, Ra..., Bubbles (air) mixed in the liquid materials R, Ra... Are floated by the material supply means 5 from the front liquid surface of the liquid materials R, Ra. While being released, the air is less likely to be caught in the liquid materials R, Ra,..., And air bubbles are prevented from being mixed into the liquid material R supplied to the injection unit 3.

  The above is the behavior in the initial stage in which the liquid materials R, Ra... Are supplied, but even during the molding operation, bubbles (air) mixed into the liquid materials R, Ra. The air floats and is discharged from the liquid surface of the liquid material R, Ra... And the air is less likely to be caught in the liquid material R, Ra. Further, even after passing through the measuring unit 11, as described above, the injection unit 3 is disposed so as to be inclined upward, and the mold C is offset downward from the center position Sc of the mold C. The configuration in which the nozzle touch surface Ct is provided and the configuration in which the mold 19 is provided with the cavity 19 that is offset upward from the center position Sc of the mold C, release of bubbles mixed (residual) in the liquid material R and Air entrainment prevention with respect to the liquid material R can be realized, and air bubbles mixed into the liquid material R can be effectively avoided.

  Therefore, according to the liquid material injection molding apparatus M according to the present embodiment, the liquid material R (which reaches the injection unit 3) is supplied to the supply port 3i of the injection unit 3 from the lower side. Ra ...) moves from the bottom to the top, and bubbles (air) mixed in the low-viscosity liquid material R (Ra ...) float and are released from the front liquid surface of the liquid material R (Ra ...), Air is less likely to be caught in the liquid material R (Ra ...), and air bubbles can be effectively avoided from entering the liquid material R (Ra ...). In addition, when avoiding the mixing of bubbles into the liquid material R (Ra ...), it can be realized by a geometric layout configuration without using a separate additional device such as a deaeration device. ) Can be reduced in size and can contribute to energy savings. In addition, since it is not necessary to provide a separate degassing step in the molding cycle, the molding cycle can be shortened by eliminating the loss of the molding cycle time, and a liquid material having a fast curing time can be flexibly handled.

  7 and 8 show a modified embodiment according to the present invention. The modified embodiment shown in FIG. 8 employs a material supply means 5 that includes a material supply pipe 12s that supplies liquid material Ra from the material supply device 4 to the injection unit 3 from below without measuring it. There is an advantage that a cast molding system that does not require a separate measuring section can be easily constructed. Further, similarly to the embodiment shown in FIG. 1, the flow resistance and the amount of air entrainment are reduced by shortening the distance between the material supply device 4 and the injection unit 3 and simplifying (lowering) the supply pipe path. In addition, it is possible to effectively avoid air bubbles from being mixed into the liquid material R (Ra ...) in the section reaching the measuring unit 11. Further, FIG. 8 shows an example in which the nozzle touch surface Ct (sprung portion Cs) provided on the mold C is provided at the center position Sc of the mold C. In FIG. 8, the same parts as those in FIG.

  On the other hand, FIG. 7 shows an example of means for inclining the injection unit 3. In the embodiment shown in FIG. 1, the case where the injection unit 3 is disposed so as to be inclined forwardly using the legs 34 and 35 whose heights can be adjusted has been shown. However, the inclination angle of the injection unit 3 is liquid. Since the purpose is to release air from the material Ra ..., there is no need to make it so large. As described above, the injection device 2 is disposed on the pedestal 31 installed on the upper surface of the machine base Mb. The pedestal 31 usually has a plurality of height adjustments as shown in FIGS. 1 and 8. Therefore, the inclination angle of the injection device 2 can be adjusted by adjusting the bolts and nuts 61. FIG. 7 shows a part of the pedestal 31 extracted.

  As mentioned above, although the best embodiment and the modified embodiment have been described in detail, the present invention is not limited to such an embodiment, and departs from the gist of the present invention in the configuration, shape, material and the like of details. It can be changed, added, or deleted as desired. For example, the low-viscosity liquid material in the present invention refers to a viscosity lower than the viscosity at which the effects of the present invention can be obtained to some extent when the material supply means 5 is provided. Moreover, although the case where two types of liquid materials Ra and Rb are used is shown, a single liquid material R may be used, and the same applies to the case where three or more types of liquid materials Ra, Rb... Are used. .

A partial cross-sectional side view of an injection molding apparatus according to the best embodiment of the present invention, Rear view of a mold plate provided in the injection molding device, A partial cross-sectional front view of a mixing section provided in the injection molding device, Action explanatory diagram of the injection molding device, Action explanatory diagram of the injection molding device, Principle explanatory diagram of the injection molding device, The figure which shows an example of the means to incline the injection part which concerns on the modified embodiment of this invention, A partial cross-sectional side view of an injection molding apparatus according to a modified embodiment of the present invention,

Explanation of symbols

  2: injection device, 3: injection unit, 3i: feed inlet, 3d: lower side of injection unit, 3r: rear part of injection unit, 4: material supply device, 5: material supply means, 11: weighing unit, 12: material Supply pipe, 12s: Material supply pipe, 13a ...: Backflow prevention valve, 14a ...: Air venting part, 15: Measuring body part, 16: Mixing part, 17: Mold plate, 18: Locate hole, 19: Cavity, Sc : Center position of mold, Ct: Nozzle touch surface, C: Mold, R: Liquid material, Ra ...: Liquid material, M: Injection molding device

Claims (9)

  In an injection molding apparatus for a liquid material, comprising an injection device having an injection part for injecting and filling a liquid material to a mold, and having an external material supply device for supplying the injection material with the liquid material. A feeding port for supplying the liquid material to the rear of the injection unit and below the injection unit to supply the liquid material measured to the supply port; An injection molding apparatus for a liquid material, comprising: a material supply means having a material supply pipe for supplying the liquid material from the material supply apparatus from below.   The liquid material injection molding apparatus according to claim 1, wherein the metering unit includes a backflow prevention valve for preventing backflow of the liquid material.   3. The liquid material injection molding apparatus according to claim 1 or 2, wherein the metering unit includes an air bleeding unit capable of discharging air existing in the passage of the liquid material to the outside.   The measuring unit is configured to measure a plurality of liquid materials supplied from a plurality of material supply devices, respectively, and a plurality of liquid materials supplied from the measuring main unit to be combined and supplied to the injection unit. The liquid material injection molding apparatus according to claim 1, further comprising a mixing unit.   2. The liquid material injection molding apparatus according to claim 1, wherein the injection portion is disposed so as to be inclined upward.   In an injection molding apparatus for a liquid material, comprising an injection device having an injection part for injecting and filling a liquid material to a mold, and having an external material supply device for supplying the injection material with the liquid material. And a material supply means for supplying a liquid material from below to the injection unit. An injection molding apparatus for liquid material, comprising:   In an injection molding apparatus for a liquid material, comprising an injection device having an injection part for injecting and filling a liquid material to a mold, and having an external material supply device for supplying the injection material with the liquid material. A supply port for supplying a liquid material to the injection unit is provided below the injection unit, and a material supply unit is provided for supplying the liquid material from below to the injection unit. A liquid material injection molding apparatus characterized in that a nozzle touch surface offset downward is also provided.   In an injection molding apparatus for a liquid material, comprising an injection device having an injection part for injecting and filling a liquid material to a mold, and having an external material supply device for supplying the injection material with the liquid material. A supply port for supplying a liquid material to the injection unit is provided below the injection unit, and a material supply unit for supplying the liquid material from below to the injection unit is provided. An injection molding apparatus for a liquid material, wherein a long locating hole is provided in a vertical direction through which an injection part is inserted.   In an injection molding apparatus for a liquid material, comprising an injection device having an injection part for injecting and filling a liquid material to a mold, and having an external material supply device for supplying the injection material with the liquid material. A supply port for supplying a liquid material to the injection unit is provided below the injection unit, and a material supply unit is provided for supplying the liquid material from below to the injection unit. A liquid material injection molding apparatus characterized in that a cavity offset upward is also provided.

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