JP6823724B1 - Injection molding equipment - Google Patents

Abstract

The injection molding apparatus includes a first and second molds (21, 22) for forming the cavity (24), a hot runner apparatus (3) having a heating portion (32) and a nozzle (33), and a nozzle. It is movably installed along the axial direction of (33), extends along the axial direction of the nozzle (33) from the inside of the nozzle (33) to the outside of the nozzle (33), and of the nozzle (33). A pin member (4) having a first end portion (4a) on the inner side and a second end portion (4b) on the outer side of the nozzle (33), and a pin member (4) along the axial direction of the nozzle (33). A driving unit (5) for generating a driving force for moving the 4) and a transmission mechanism (6) for transmitting the driving force to the second end portion (4b) of the pin member (4) are provided. The pin member (4) and the drive unit (5) are arranged along the radial direction of the pin member (4).

Description

The present invention relates to an injection molding device.

Conventionally, as an injection molding apparatus, as disclosed in Japanese Patent Application Laid-Open No. 2001-30300 (Patent Document 1), there is an injection molding apparatus provided with first and second molds and a hot runner apparatus.

The hot runner device has a nozzle, and the resin discharged from the nozzle flows into the cavity between the first and second molds.

Japanese Unexamined Patent Publication No. 2001-30300

However, Patent Document 1 does not mention a mechanism for adjusting the amount of resin discharged from the nozzle to the cavity.

Further, the problem that the vertical direction (axial direction of the nozzle) of the injection molding apparatus becomes large when the above mechanism is installed is not disclosed.

Therefore, an object of the present invention is to provide an injection molding apparatus capable of preventing the size from becoming large in the axial direction of the nozzle.

The injection molding apparatus of one aspect of the present invention is
The first and second molds for forming the cavity,
With respect to the first mold, a mounting plate arranged on the opposite side of the second mold,
A nozzle arranged between the mounting plate and the first mold and having a discharge port for discharging resin on the cavity side at the tip, and a nozzle for heating the resin discharged by the discharge port. A hot runner device having a heating unit and
A backup member attached to the surface of the mounting plate on the first mold side, and
It is installed so as to be movable along the axial direction of the nozzle, extends from the inside of the nozzle to the outside of the nozzle along the axial direction, and at the first end on the inner side of the nozzle and the nozzle. A pin member having a second end on the outer side of the
A drive unit that generates a driving force for moving the pin member along the axial direction,
A transmission mechanism for transmitting the driving force to the second end of the pin member is provided.
The first end of the pin member closes the discharge port when the pin member moves toward the discharge port side along the axial direction of the nozzle, while the pin member moves in the axial direction of the nozzle. When moving along the side opposite to the discharge port side, the discharge port is opened and the discharge port is opened.
The pin member and the drive unit are arranged along the radial direction of the pin member .
Between the hot runner device and the drive unit, part of the backup member you intervention.

According to the above configuration, when the pin member moves toward the discharge port side along the axial direction of the nozzle, the first end portion of the pin member closes the discharge port. On the other hand, when the pin member moves along the axial direction of the nozzle to the side opposite to the discharge port side, the first end portion of the pin member opens the discharge port.

In this way, when the discharge port is closed or when the discharge port is opened, the opening ratio of the discharge port can be arbitrarily changed by controlling the axial position of the first end portion. Therefore, the amount of resin discharged from the discharge port can be arbitrarily adjusted.

Further, by arranging the pin member and the drive unit along the radial direction of the pin member, it is not necessary to secure a space for arranging the drive unit on the side opposite to the nozzle side with respect to the pin member. Therefore, it is possible to prevent the size of the injection molding apparatus from becoming large in the axial direction of the nozzle.

In one aspect of the injection molding device,
The transmission mechanism, possess a first pulley disposed on said pin member, a second pulley disposed on the drive unit side, the first, and a belt wound around the second pulley,
The first and second pulleys are housed in the first and second recesses provided on the surface of the mounting plate opposite to the first mold.
The belt, said first and second recesses, and the first mold of the mounting plate Ru housed in groove portion provided on the opposite surface.

According to the above aspect, the drive unit is transmitted to the pin member via the first and second pulleys and the belt. By changing the diameters of the first and second pulleys, the operating torque and moving speed of the pin member can be freely changed.
In one aspect of the injection molding device,
The drive unit is attached to one end of the mounting plate so as not to be located between the first mold and the mounting plate .

In one aspect of the injection molding device,
The heating portion is attached to the outer peripheral surface of the nozzle.

According to the above aspect, the resin in the nozzle can be easily melted by attaching it to the outer peripheral surface of the nozzle with a heating portion.

In the injection molding apparatus of the present invention, since the pin member and the drive unit are arranged along the radial direction of the pin member, it is possible to prevent the size from becoming large in the axial direction of the nozzle.

It is a schematic cross-sectional view of the injection molding apparatus of one Embodiment of this invention. It is a schematic cross-sectional view for demonstrating the operation of the injection molding apparatus. It is a schematic cross-sectional view for demonstrating the mechanism of driving a stem pin. It is a schematic cross-sectional view for demonstrating the adjustment of the resin discharge amount by the said stem pin. It is another schematic cross-sectional view for demonstrating the adjustment of the resin discharge amount by the said stem pin.

Hereinafter, the injection molding apparatus of the present invention will be described in detail with reference to the illustrated embodiment.

FIG. 1 is a schematic cross-sectional view showing the configuration of an injection molding apparatus according to an embodiment of the present invention.

The injection molding device includes a fixed side mounting plate 1, a cassette mold 2, a hot runner device 3, a stem pin 4, a servomotor 5, a transmission mechanism 6, and a movable side mounting plate 7. The stem pin 4 is an example of a pin member. The servomotor 5 is an example of a drive unit.

A backup member 8 is attached to the lower surface of the fixed-side mounting plate 1. A first fixed side support member 9A is installed under one side of the backup member 8. A second fixed side support member 9B is installed under the other side of the backup member 8. The first and second fixed side support members 9A and 9B are integrated with the backup member 8. A part of the cassette mold 2 is arranged so as to be sandwiched between the first and second fixed side support members 9A and 9B.

The backup member 8 is formed so as to surround most of the hot runner device 3 and has a frame shape. The backup member 8 is fixed to the fixed side mounting plate 1 with, for example, bolts.

The cassette mold 2 has a fixed mold 21 fixed to the backup member 8 with a clamp, and a movable mold 22 arranged under the fixed mold 21. The space defined by the recess on the lower surface of the fixed mold 21 and the recess on the upper surface of the movable mold 22 serves as the cavity 24 for forming the product. The molten resin is injected into the cavity 24 via the hot sprue 10. When the product is taken out from the cassette mold 2, an actuator (not shown) such as a hydraulic cylinder moves the movable side mounting plate 7 in a direction away from the fixed side mounting plate 1 as shown in FIG. The fixed mold 21 and the movable mold 22 are examples of the first and second molds.

The hot sprue 10 has a resin passage (not shown). This resin passage guides the molten resin from the nozzle 33 to the cavity 24. Further, the hot sprue 10 is composed of a receiving portion 101 and an injection portion 102. The receiving portion 101 and the injection portion 102 are fitted into the stepped through hole 21a provided in the fixed mold 21. The receiving portion 101 is fixed to the fixing mold 21 with screws, for example. As a result, the injection portion 102 is pressed against the inner surface of the stepped through hole 21a by the receiving portion 101 so as not to come out of the stepped through hole 21a.

The hot runner device 3 includes a manifold block 31, a band heater 32 for heating the resin (shown in FIG. 3), and a nozzle 33 having a discharge port 33a for discharging the resin on the cavity 24 side at the tip portion 33b. Has. The band heater 32 is an example of a heating unit.

The manifold block 31 is provided with a resin passage 31a (shown in FIG. 3) through which a molten resin from a resin supply device (not shown) flows. The space in the resin passage 31a is connected to the space in the nozzle 33. As a result, the molten resin in the resin passage 31a can flow into the space in the nozzle 33.

The band heater 32 is wound around the outer peripheral surface of the nozzle 33 and surrounds the outer peripheral surface of the nozzle 33. The band heater 32 can heat the resin in the nozzle 33 via the nozzle 33.

The discharge port 33a of the nozzle 33 is opened and closed at the lower end portion 4a (shown in FIG. 3) of the stem pin 4. When the discharge port 33a is opened, the molten resin in the nozzle 33 can flow into the resin passage of the hot sprue 10. The discharge port 33a is usually opened when the product is formed. Further, the tip portion 33b of the nozzle 33 is abutted against the receiving portion 101 of the hot sprue 10 and comes into contact with the receiving portion 101 of the hot sprue 10. The lower end portion 4a is an example of the first end portion.

The servomotor 5 generates a driving force for moving the stem pin 4 along the axial direction of the nozzle 33. More specifically, the servomotor 5 is attached to the fixed side mounting plate 1 and is in a state of being suspended from the fixed side mounting plate 1. Further, the servomotor 5 is located on the opposite side of the backup member 8 from the hot runner device 3 side with respect to the other side portion. That is, the other side portion of the backup member 8 is located between the servomotor 5 and the other side portion of the backup member 8. Here, the stem pin 4 and the servomotor 5 are not arranged along the axial direction of the stem pin 4, but are arranged along the radial direction of the stem pin 4.

The transmission mechanism 6 is wound around a first toothed pulley 61A arranged on the stem pin 4 side, a second toothed pulley 61B arranged on the servomotor 5 side, and first and second toothed pulleys 61A and 61B. It has a timing belt 62 and the like. By this transmission mechanism 6, the driving force (rotational force) of the servomotor 5 is transmitted to the stem pin 4. Further, the first and second toothed pulleys 61A and 61B and the timing belt 62 are made of a heat-resistant material (for example, heat-resistant resin). The first toothed pulley 61A is an example of the first pulley. The second toothed pulley 61B is an example of the second pulley. The timing belt 62 is an example of a belt.

The first and second toothed pulleys 61A and 61B are housed in the first and second recesses 1a and 1b provided on the upper surface of the fixed side mounting plate 1.

Most of the timing belt 62 is housed in a groove (not shown) provided on the upper surface of the fixed side mounting plate 1. The space in the groove is connected to the space in the first and second recesses 1a and 1b.

The movable side mounting plate 7 can be moved closer to the fixed side mounting plate 1 or moved away from the fixed side mounting plate 1. On the movable side mounting plate 7, for example, a first support member 12A that supports one side portion of the movable mold 22 and a second support member 12B that supports the other side portion of the movable mold 22 are bolted. It is fixed. A first movable side support member 11A is installed on the first support member 12A. A second movable side support member 11B is installed on the second support member 12B. The first and second movable side support members 11A and 11B are integrated with the first and second support members 12A and 12B.

Further, in the injection molding apparatus, when the product is taken out from the cassette mold 2, an actuator (not shown) such as a hydraulic cylinder is movable on the side opposite to the fixed side mounting plate 1 side as shown in FIG. The side mounting plate 7 is moved. After the product is taken out, the actuator moves the movable side mounting plate 7 to the fixed side mounting plate 1 side as shown in FIG. At this time, the lower ends of the first and second fixed side support members 9A and 9B abut against the upper ends of the first and second movable side support members 11A and 11B.

In addition, the injection molding device includes a product extrusion device 16 for taking out the product formed in the cavity 24 from the cassette mold 2.

The product extrusion device 16 has a first extrusion plate 16a, a second extrusion plate 16b arranged under the first extrusion plate 16a, and a plurality of extrusion pins 16c. The upper end of each extrusion pin 16c can protrude from the recess on the upper surface of the movable mold 22. On the other hand, the lower end of each extrusion pin 16c is connected to the first extrusion plate 161A and the second extrusion plate 161B.

FIG. 3 is a schematic cross-sectional view for explaining the driving mechanism of the stem pin 4.

The stem pin 4 is movably installed along the axial direction of the nozzle 33. The stem pin 4 extends from the inside of the nozzle 33 to the outside of the nozzle 33 along the axial direction of the nozzle 33. Further, the lower end portion 4a of the stem pin 4 is arranged in the nozzle 33. On the other hand, the upper end portion 4b of the stem pin 4 is arranged outside the nozzle 33 and inserted into the stem nut 17. Further, the upper end portion 4b of the stem pin 4 has a thread on the outer peripheral surface. The upper end portion 4b is an example of the second end portion.

A pulley 61A with a first tooth is attached to the stem nut 17. More specifically, a part of the stem nut 17 is fitted into the shaft hole 161A of the first toothed pulley 61A and rotates integrally with the first toothed pulley 61A. Most of the other stem nuts 17 are attached to the fixed side mounting plate 1 via the first and second bearings 18A and 18B. Further, a screw thread is formed on the inner peripheral surface of the stem nut 17. This thread meshes with the thread of the upper end portion 4b of the stem pin 4. As a result, when the stem nut 17 rotates integrally with the pulley 61A with the first tooth, the stem pin 4 moves along the axial direction of the nozzle 33.

Further, a detent block 19 is attached to the lower surface of the fixed side mounting plate 1 so as to cover the stem nut 17. The stem pin 4 can move in the axial direction with respect to the detent block 19, but cannot rotate with respect to the detent block 19. More specifically, the detent block 19 has a through hole 19b at the bottom 19a that has a D-shape in a plan view. A part of the intermediate portion 4c of the stem pin 4 is formed so as to have a D-shaped cross section, and is inserted through the through hole 19b.

Further, the manifold block 31 has a stepped through hole 31b extending from the upper surface of the manifold block 31 to the resin passage 31a. The other portion of the intermediate portion 4c of the stem pin 4 is inserted through the stepped through hole 31b. A seal member 34 seals between the outer peripheral surface of the other portion and the inner peripheral surface of the stepped through hole 31b on the large diameter side.

The servomotor 5 has a main body 51, a boss 52 provided on the upper end surface of the main body 51, and a rotating shaft 53 protruding upward from the boss 52.

The boss portion 52 is fitted into the large diameter portion of the stepped through hole 1c of the fixed side mounting plate 1. The rotating shaft 53 is inserted through the small diameter portion of the stepped through hole 1c.

The rotating shaft 53 is fitted into the shaft hole 161B of the second toothed pulley 61B and rotates integrally with the second toothed pulley 61B. The rotational force of the second toothed pulley 61B is transmitted to the first toothed pulley 61A via the timing belt 62.

In the injection molding apparatus having the above configuration, as shown in FIG. 3, when the lower end portion 4a of the stem pin 4 is sufficiently separated from the discharge port 33a of the nozzle 33 and the opening ratio of the discharge port 33a is 100%, the nozzle 33 The amount of resin discharged is maximized. Further, as shown in FIG. 4, when the discharge port 33a of the nozzle 33 is closed by the lower end portion 4a of the stem pin 4 and the opening ratio of the discharge port 33a is set to 0%, the amount of resin discharged from the nozzle 33 is It becomes the minimum. That is, at that time, the resin is not discharged from the nozzle 33. Further, as shown in FIG. 5, a gap is provided between the peripheral surface of the discharge port 33a of the nozzle 33 and the peripheral surface of the lower end portion 4a of the stem pin 4, so that the aperture ratio of the discharge port 33a is smaller than 100%. When it is made larger than 0%, the amount of resin discharged from the nozzle 33 is smaller than the maximum and larger than the minimum.

By controlling the axial position of the lower end portion 4a of the stem pin 4 in this way, the amount of resin discharged from the discharge port 33a can be arbitrarily adjusted.

Further, since the stem pin 4 and the servomotor 5 are arranged along the radial direction of the stem pin 4, it is not necessary to provide a space for arranging the servomotor 5 on the manifold block 31. Therefore, it is possible to prevent the size of the injection molding apparatus from becoming large in the vertical direction (axial direction of the nozzle 33).

By arranging the stem pin 4 and the servomotor 5 along the radial direction of the stem pin 4, the servomotor 5 can be separated from the hot runner device 3, so that the risk of the servomotor 5 failing due to the heat of the hot runner device 3 is reduced. ..

Since the risk of failure of the servomotor 5 due to the heat of the hot runner device 3 is reduced, the mechanism for cooling the servomotor 5 can be simplified or eliminated.

Further, the servomotor 5 is transmitted to the stem pin 4 via the pulleys 61A and 61B with the first and second teeth and the timing belt 62. By changing the diameters of the first and second toothed pulleys 61A and 61B, the operating torque and moving speed of the stem pin 4 can be freely changed.

Further, since the band heater 32 is attached to the outer peripheral surface of the nozzle 33, the resin in the nozzle 33 can be easily melted.

In the above embodiment, when the product is formed, the fixed mold 21 is arranged on the upper side and the movable mold 22 is arranged on the lower side, but the fixed mold 21 is arranged on one side in the left-right direction. Moreover, the movable mold 22 may be arranged on the other side in the left-right direction.

In the above embodiment, the fixed mold 21 and the movable mold 22 are used to form the resin product, but the fixed mold 21, the movable mold 22, and another mold (for example, a slide core) are used. , A resin product may be formed. That is, the number of molds for forming the resin product is not limited to two, and may be three or more. In this case, the molds other than the fixed mold 21 and the movable mold 22 may be molds that are movable with respect to the fixed mold 21 and the movable mold 22.

In the above embodiment, the number of gate points is one, but for example, the shape of the resin passage 31a may be changed to two or more. In this case, the resin discharge amount may be adjusted at each gate.

In the above embodiment, the band heater 32 is attached to the outer peripheral surface of the nozzle 33, but for example, a cartridge heater may be embedded in the manifold block 31. The cartridge heater is an example of a heating unit.

In the above embodiment, the servomotor 5 is not in contact with the backup member 8, but the servomotor 5 may be supported by a part of the backup member 8.

In the above embodiment, the transmission mechanism 6 has the first and second toothed pulleys 61A and 61B, but instead of the first and second toothed pulleys 61A and 61B, it has a so-called toothless pulley. You may.

In the above embodiment, the transmission mechanism 6 has a timing belt 62, but instead of the timing belt 62, for example, a flat belt, a V-belt, a chain, or the like may be provided.

In the above embodiment, the driving force of the servomotor 5 is transmitted to the stem pin 4 by the first and second toothed pulleys 61A and 61B and the timing belt 62, but is transmitted to the stem pin 4 by a plurality of gears that mesh with each other. You may do so.

In the above embodiment, the servo motor 5 is used, but other motors may be used. In this case, in order to control the position of the lower end portion 4a of the stem pin 4, for example, a rotary encoder or the like may be used to detect the amount of rotation of the stem pin 4.

Although the specific embodiment of the present invention has been described, the present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention. For example, an embodiment of the present invention may be a combination of modifications of the above embodiment as appropriate.

1 Fixed side mounting plate 2 Cassette mold 3 Hot runner device 4 Stem pin 4a Lower end 4b Upper end 5 Servo motor 6 Transmission mechanism 7 Movable side mounting plate 10 Hot sprue 21 Fixed mold 22 Movable mold 24 Cavity 31 Manifold block 31a Resin Passage 32 Band heater 33 Nozzle 33a Discharge port 33b Tip 61A Pulley with first tooth 61B Pulley with second tooth 62 Timing belt

Claims (3)

The first and second molds for forming the cavity,
With respect to the first mold, a mounting plate arranged on the opposite side of the second mold,
A nozzle arranged between the mounting plate and the first mold and having a discharge port for discharging resin on the cavity side at the tip, and a nozzle for heating the resin discharged by the discharge port. A hot runner device having a heating unit and
A backup member attached to the surface of the mounting plate on the first mold side, and
It is installed so as to be movable along the axial direction of the nozzle, extends from the inside of the nozzle to the outside of the nozzle along the axial direction, and at the first end on the inner side of the nozzle and the nozzle. A pin member having a second end on the outer side of the
A drive unit that generates a driving force for moving the pin member along the axial direction,
A transmission mechanism for transmitting the driving force to the second end of the pin member is provided.
The first end of the pin member closes the discharge port when the pin member moves toward the discharge port side along the axial direction of the nozzle, while the pin member moves in the axial direction of the nozzle. When moving along the side opposite to the discharge port side, the discharge port is opened and the discharge port is opened.
The pin member and the drive unit are arranged along the radial direction of the pin member .
The above between the hot runner device and the drive unit, the injection molding apparatus portion of the backup member is characterized that you intervention. In the injection molding apparatus according to claim 1,
The transmission mechanism, possess a first pulley disposed on said pin member, a second pulley disposed on the drive unit side, the first, and a belt wound around the second pulley,
The first and second pulleys are housed in the first and second recesses provided on the surface of the mounting plate opposite to the first mold.
The belt, said first and second recesses, the injection molding apparatus according to claim Rukoto housed in groove portion provided on the surface opposite from the first mold of the mounting plate. In the injection molding apparatus according to claim 1 or 2.
An injection molding apparatus, wherein the drive unit is attached to one end of the mounting plate so as not to be located between the first mold and the mounting plate .

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