JP7073464B2 - Injection molding equipment - Google Patents

Description

The present invention relates to an injection molding apparatus.

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 a first and second molds and a hot runner apparatus.

The hot runner device has a nozzle for injecting resin into the cavity between the first and second molds. The first mold is provided with a resin passage for guiding the resin from the discharge port at the tip of the nozzle to the cavity. The tip of the nozzle is pressed against the peripheral edge of the entrance (nozzle side opening) of the resin passage. As a result, the discharge port at the tip of the nozzle faces the entrance of the resin passage.

Japanese Unexamined Patent Publication No. 2001-30300

In the above-mentioned conventional injection molding apparatus, the inlet of the resin passage is displaced from a predetermined position due to a manufacturing error of the first mold, and a part of the discharge port at the tip of the nozzle is located at the peripheral edge of the inlet of the resin passage. It may face each other. In such a state, if the resin is discharged from the discharge port at the tip of the nozzle, there is a problem that resin leakage occurs.

Therefore, an object of the present invention is to provide an injection molding apparatus capable of suppressing resin leakage.

The injection molding apparatus of one aspect of the present invention is
The first and second molds for forming the cavity,
A hot runner device having a main body, a nozzle having a discharge port for discharging resin at the tip, and a floating jacket physically connected to the nozzle.
A holding member that holds the floating jacket so that it is not physically connected to the floating jacket and allows the floating jacket to move in the radial direction of the nozzle.
It is provided in the first mold, and is provided with a hot sprue to which the tip of the nozzle is abutted and has a first resin passage.
The first resin passage has an inlet for receiving the resin from the discharge port on the nozzle side and an outlet for pouring the resin in the first resin passage into the cavity on the cavity side. ,
The nozzle has the tip on the hot sprue side, while the nozzle has a root on the floating jacket side.
The root portion of the nozzle is slidably fitted into the through hole of the floating jacket with respect to the peripheral surface of the through hole of the floating jacket, and the nozzle moves in the radial direction of the nozzle together with the floating jacket. In addition to being possible, the floating jacket can be moved in the axial direction of the nozzle .

According to the above configuration, the floating jacket and the holding member allow the nozzle to move in the radial direction. Therefore, when the position of the entrance of the first resin passage deviates from a predetermined position, the nozzle can be moved in the radial direction to offset the deviation of the entrance of the first resin passage. As a result, resin leakage can be suppressed.
In one aspect of the injection molding machine,
The nozzle can be moved in the axial direction of the nozzle together with the floating jacket .
In one aspect of the injection molding machine,
The main body portion has a second resin passage for guiding the resin to the nozzle, and a through hole formed on the nozzle side of the main body portion and communicating with the second resin passage.
The nozzle extends from the base end side of the nozzle to the tip end side of the nozzle and has a third resin passage for guiding the resin to the hot sprue.
The third resin passage has an inlet for receiving the resin from the through hole on the base end side of the nozzle, while the discharge port is on the tip end side of the nozzle.
The nozzle is attached to the main body so that the entrance of the third resin passage faces the through hole of the main body.
The diameter of the entrance of the third resin passage is smaller than the diameter of the through hole of the main body.
In one aspect of the injection molding machine,
The end surface of the hot sprue on the nozzle side is provided with a concave surface recessed on the cavity side.
The surface of the concave surface has a tapered surface located on the nozzle side and shrinking in diameter toward the cavity, and a curved surface having an arcuate cross section located on the cavity side and connected to the tapered surface.
The tip surface of the nozzle is provided on the side surface of the truncated cone that tapers toward the tip end side of the nozzle, and the surface of the spherical cap that is provided on the tip end side of the nozzle from the side surface of the truncated cone and is continuous with the side surface of the truncated cone. And have
The side surface of the truncated cone is formed to have the same inclination as the tapered surface, while the surface of the spherical crown is formed to have the same curvature as the curved surface.
One aspect of the injection molding device is
It is equipped with a rod member provided around the nozzle.
When the tip of the nozzle is abutted against the hot sprue, the end of the rod member on the first mold side abuts on the surface of the first mold on the hot runner device side.

In one aspect of the injection molding machine,
An elastic member is arranged between the main body and the nozzle.

According to the above aspect, when the tip end portion of the nozzle is abutted against the hot sprue, the elastic member is located between the main body portion and the nozzle, so that the possibility of damage to the nozzle and the hot sprue can be reduced.

In one aspect of the injection molding machine,
The end surface of the hot sprue on the nozzle side has a shape complementary to the tip surface of the nozzle.

Here, the complementary shape means a shape for bringing at least a part of the end face of the hot sprue on the nozzle side into close contact with at least a part of the tip surface of the nozzle. For example, when at least a part of the tip surface of the nozzle is a convex surface (a surface formed so as to project toward the hot sprue side), at least a part of the end surface of the hot sprue on the nozzle side is a concave surface (what is the nozzle side). A surface formed so as to be recessed on the opposite side).

According to the above aspect, the nozzle-side end surface of the hot sprue has a shape complementary to the nozzle tip surface, so that the contact area between the nozzle-side end surface of the hot sprue and the nozzle tip surface can be increased. can.

In the injection molding apparatus of the present invention, since the nozzle is attached to the main body so as to be movable in the radial direction, resin leakage can be suppressed.

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 which enlarged the nozzle and its peripheral part. It is a schematic perspective view when the floating jacket is seen from the upper side. It is a schematic perspective view when the floating jacket is seen from the lower side. It is a schematic perspective view when the nozzle, a floating jacket and the 1st and 2nd holding members are seen from the lower side. It is a schematic cross-sectional view for demonstrating the movement of a nozzle at the time of fixing a fixing mold to a backup member. FIG. 5 is a schematic cross-sectional view for explaining the movement of the nozzle following FIG. 7. It is a schematic cross-sectional view for demonstrating the movement of a nozzle following FIG. It is a schematic cross-sectional view for demonstrating the movement of a nozzle following FIG. It is a schematic cross-sectional view for demonstrating the movement of a nozzle following FIG.

Hereinafter, the injection molding apparatus of the present invention will be described in detail with reference to the illustrated embodiment. In this description, the "axial direction" means the axial direction of the nozzle 33 or a direction parallel thereto. Further, the "diametrical direction" means the radial direction of the nozzle 33 or a direction parallel to the radial direction thereof.

FIG. 1 is a schematic cross-sectional view showing the configuration of an injection molding apparatus according to an embodiment of the present invention. Note that in FIG. 1, a part of the injection molding apparatus is not shown.

The injection molding apparatus includes a fixed side mounting plate 1, a cassette mold 2, a hot runner device 3, and a movable side mounting plate 4.

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 exhibits a frame shape. The backup member 8 is fixed to the fixed side mounting plate 1 with, for example, a bolt.

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. 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 10a extending in the axial direction and is provided in the fixed mold 21. More specifically, the hot sprue 10 has a receiving portion 101 and an injection portion 102 arranged under the receiving portion 101. 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, for example, a screw. 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 has a manifold block 31 and a nozzle 33 having a discharge port 33a provided at the tip portion 33b. The manifold block 31 is an example of the main body.

Inside the manifold block 31, a resin passage 31a (shown in FIG. 3) through which the molten resin from the resin supply device (not shown) flows is provided. 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 nozzle 33 is axially aligned with the hot sprue 10. The discharge port 33a of the nozzle 33 discharges the molten resin. This resin is supplied to the cavity 24 via the resin passage 10a of the hot sprue 10. 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 movable side mounting plate 7 can be moved closer to the fixed side mounting plate 1 and can be 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 (for example). (Not shown) 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. Move the side mounting plate 7. 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.

Further, 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 extruder 16 has a first extrusion plate 161A, a second extrusion plate 161B arranged under the first extrusion plate 161A, and a plurality of extrusion pins 162. The upper end of each extrusion pin 162 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 162 is connected to the first extrusion plate 161A and the second extrusion plate 161B.

A band heater 91 (shown in FIG. 6) is wound around the outer peripheral surface of the nozzle 33. The band heater 91 heats the resin in the nozzle 33 via the nozzle 33.

FIG. 3 is a schematic view showing the nozzle 33 of FIG. 1 and its peripheral portion in an enlarged manner. In FIG. 3, the band heater 91 is not shown.

As shown in FIG. 3, a nozzle 33 is attached to the manifold block 31 so as to be movable in the radial direction. Further, a disk-shaped recess 31b is provided on the lower surface of the manifold block 3. The inside of the recess 31b is connected to the resin passage 31a via the through hole 31c.

The nozzle 33 has a resin passage 33c extending along the axial direction of the nozzle 33. The diameter of the resin passage 33c is smaller than the diameter of the through hole 31c of the manifold block 31. Further, the inlet 33d of the resin passage 33c opens on the manifold block 31 side. On the other hand, the outlet (discharge port 33a) of the resin passage 33c opens on the hot sprue 10 side.

Further, the base portion 33e of the nozzle 33 is slidably fitted in the through hole 34a of the floating jacket 34 so as to be slidable with respect to the peripheral surface of the through hole 34a of the floating jacket 34. When the nozzle 33 moves in the radial direction, the floating jacket 34 also moves in the radial direction together with the nozzle 33.

Further, a flange portion 33f projecting outward in the radial direction of the nozzle 33 is provided at an intermediate portion in the axial direction of the nozzle 33. The outer diameter of the flange portion 33f is set to be larger than the diameter of the through hole 34a of the floating jacket 34.

FIG. 4 is a schematic perspective view of the floating jacket 34 when viewed from above. Further, FIG. 5 is a schematic perspective view of the floating jacket 34 when viewed from below.

As shown in FIGS. 3 to 5, the floating jacket 34 is arranged under, for example, a square plate-shaped top plate portion 341, a cylindrical portion 342 provided on the top plate portion 341, and a top plate portion 341. It has legs 343A, 343B, 343C, 343D (only legs 343A, 343B are shown in FIG. 3). Here, the through hole 34a of the floating jacket 34 is composed of a through hole penetrating the top plate portion 341 and a through hole defined by the inner peripheral surface of the cylindrical portion 342.

The upper end of the cylindrical portion 342 of the floating jacket 34 is inserted into the recess 31b of the manifold block 31. Further, a predetermined amount of gap is provided between the outer peripheral surface of the upper end portion of the cylindrical portion 342 and the inner peripheral surface of the concave portion 31b.

The legs 343A, 343B, 343C, 343D are fixed to the corners of the top plate 341 with screws 344A, 344B, 3434, 344D. Further, the lower ends of the legs 343A, 343B, 343C, and 343D are set so as to abut on the upper surface of the fixed mold 21.

Further, the injection molding apparatus includes a ring-shaped disc spring 35 that surrounds the nozzle 33 on the flange portion 33f of the nozzle 33. The disc spring 35 is sandwiched between the flange 33f and the top plate portion 341 of the floating jacket 341, and is held between the flange 33f and the top plate portion 341 of the floating jacket 341. Further, the outer diameter of the disc spring 35 is set so as to substantially match the outer diameter of the flange portion 33f of the nozzle 33. The disc spring 35 is an example of an elastic member.

FIG. 6 is a schematic perspective view of the nozzle 33, the floating jacket 34, and the first and second holding members 36A and 36B when viewed from below.

As shown in FIGS. 3 and 6, the first and second holding members 36A and 36B are composed of vertical portions 361A and 361B extending in the axial direction and horizontal portions 362A and 362B extending in the radial direction. It is made up.

Screws 37A, 37B, 37C, 37D are inserted through the vertical portions 361A and 361B. By tightening the screws 37A, 37B, 37C, 37D, the first and second holding members 36A, 36B are fixed to the lower surface of the manifold block 3 (shown in FIG. 3). Further, a predetermined amount of gap is provided between the vertical portions 361A and 361B and the top plate portion 341 of the floating jacket 34.

The lateral portions 362A and 362B face the flange portion 33f of the nozzle 33 in the radial direction. A predetermined amount of gap is provided between the lateral portions 362A and 362B and the flange portion 33f of the nozzle 33. Further, the end portions of the lateral portions 362A and 362B on the flange portion 33f side face the top plate portion 341 of the floating jacket 34 in the axial direction.

The axis of the resin passage 10a of the hot sprue 10 is substantially aligned with the axis of the resin passage 33c of the nozzle 33. In other words, when viewed from the axial direction, the axis of the resin passage 10a of the hot sprue 10 is located near the axis of the resin passage 33c of the nozzle 33.

The resin passage 10a has an inlet 10b for receiving the resin from the discharge port 33a on the nozzle 33 side, and an outlet 10c for pouring the resin in the resin passage 10a into the cavity 24 on the cavity 24 side.

The upper surface of the receiving portion 101 of the hot sprue 10 (the end surface on the nozzle 33 side) has a shape complementary to the tip surface of the nozzle 33 (the surface of the tip portion 33b on the receiving portion 101 side). A concave surface 101a recessed toward the cavity 24 is provided on the upper surface of the receiving portion 101 of the hot sprue 10. The surface of the concave surface 101a has a tapered surface 1011 and a curved surface 1012 having an arc-shaped cross section that is located deeper than the tapered surface 1011 and is continuous with the tapered surface 1011.

On the other hand, the tip surface of the nozzle 33 is provided on the side surface 331 of the truncated cone that tapers toward the tip side of the nozzle 33 and on the tip side of the nozzle 33 with respect to the truncated cone, and the surface 332 of the spherical cap connected to the truncated cone. And have. The side surface 331 is formed so as to have the same inclination as the tapered surface 1011. Further, the surface 332 is formed so as to have the same curvature as the curved surface 1012. The inclination means an inclination angle with respect to the axial direction, and is preferably in the range of, for example, 5 ° to 10 °.

In FIG. 6, 92 is a stem pin.

Hereinafter, the operation of the injection molding apparatus having the above configuration will be described with reference to FIGS. 7 to 11. In addition, in FIGS. 7 to 11, the same component as the component of FIG. 3 is assigned the same reference number as the reference number of the component of FIG. As in FIG. 3, the band heater 91 is not shown in FIGS. 7 to 11.

In the injection molding apparatus, when the fixing mold 21 is fixed to the backup member 8, for example, as shown in FIG. 7, the axis of the resin passage 10a of the hot sprue 10 and the axis of the resin passage 33c of the nozzle 33 It is assumed that the deviation is large. When the fixed mold 21 is brought close to the backup member 8 from such a state, first, as shown in FIG. 8, the side surface 331 forming a part of the tip surface of the nozzle 33 is a tapered surface on the concave surface 101a of the receiving portion 101. Contact 1011. Then, when the fixed mold 21 is brought closer to the backup member 8, the nozzle 33 moves in the radial direction with respect to the manifold block 31, and as shown in FIGS. 9 and 10, the shaft of the resin passage 10a of the hot sprue 10 The distance between the center and the axis of the resin passage 33c of the nozzle 33 is shortened. Finally, the surface 332, which forms another part of the tip surface of the nozzle 33, comes into contact with the curved surface 1012 on the concave surface 101a of the receiving portion 101. At this time, the nozzle 33 moves toward the manifold block 31 side against the urging force of the disc spring 35, and as shown in FIG. 11, the lower ends of the legs 343A, 343B, 343C, 343D of the floating jacket 34 are fixed. It hits the upper surface of the mold 21.

In this way, when the fixing mold 21 is fixed to the backup member 8, even if the discharge port 33a of the resin passage 33c does not properly face the inlet 10b of the resin passage 10a in the axial direction, the nozzle 33 is radially oriented. The discharge port 33a of the resin passage 33c can be appropriately opposed to the inlet 10b of the resin passage 10a. In other words, the axis of the resin passage 10a of the hot sprue 10 and the axis of the resin passage 33c of the nozzle 33 can be aligned substantially in a straight line. Therefore, it is possible to suppress resin leakage due to the deviation between the axis of the resin passage 10a of the hot sprue 10 and the axis of the resin passage 33c of the nozzle 33.

Further, since the disc spring 35 is arranged between the flange portion 33f of the nozzle 33 and the cylindrical portion 342 of the floating jacket 34, the tip portion 33b of the nozzle 33 is abutted against the receiving portion 101 of the hot sprue 10. The impact at that time can be absorbed by the disc spring 35. Therefore, the possibility of damage to the nozzle 33 and the hot sprue 10 can be reduced.

Further, the position of the nozzle 33 in the axial direction can be adjusted within the range of the amount of deformation of the disc spring 35 in the axial direction.

Further, since the nozzle 33 is pressed against the hot sprue 10 by the resin pressure from the manifold block 31 side and the urging force of the disc spring 35, the receiving portion of the nozzle 33 is partly on the curved surface 1012 on the nozzle 33 side of the receiving portion 101. The surface 332 on the 101 side can be strongly adhered. As a result, the effect of preventing resin leakage from between the curved surface 1012 and the surface 332 can be enhanced.

Further, the surface 332 of the nozzle 33 on the receiving portion 101 side is a convex curved surface formed so as to project toward the receiving portion 101. On the other hand, the curved surface 1012 on the nozzle 33 side of the receiving portion 101 is a concave curved surface formed so as to be recessed on the cavity 24 side. Therefore, the contact area between the surface 332 and the curved surface 1012 can be increased.

Further, since the surface 332 on the receiving portion 101 side of the nozzle 33 is the convex curved surface and the curved surface 1012 on the nozzle 33 side of the receiving portion 101 is the concave curved surface, the radial direction of the nozzle 33 is formed when the product is formed. The effect of preventing the movement of the surface is obtained.

Further, since the concave surface 101a of the receiving portion 101 has the tapered surface 1011 on the nozzle 33 side, the nozzle 33 can be moved reliably and smoothly in the radial direction, so that the function of adjusting the position of the central axis of the nozzle 33 can be adjusted. It can increase reliability.

Further, when the fixing mold 21 is fixed to the backup member 8, the upper end surface of the cylindrical portion 341 of the floating jacket 34 is pressed against the bottom surface of the recess 31b of the manifold block 31. As a result, since the upper end surface of the cylindrical portion 341 is in close contact with the bottom surface of the recess 31b, resin leakage from between the upper end surface of the cylindrical portion 341 and the bottom surface of the recess 31b can be prevented.

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 band heater 91 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.

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 the above embodiment, the disc spring 35 is arranged between the flange portion 33f of the nozzle 33 and the floating jacket 34, but for example, a coil spring may be arranged as an example of an elastic member. In short, any member that can be elastically deformed may be used instead of the disc spring 35.

In the above embodiment, the cross-sectional shape of the concave surface 101a is a shape consisting of two straight lines and one arc, but for example, it may be a shape consisting of only one arc. In other words, the concave surface 101a may be composed of, for example, a concave curved surface defined by one predetermined curvature. Similarly, the tip surface of the nozzle 33 may also be composed of a concave curved surface defined by one predetermined curvature.

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 embodiments as appropriate.

1 Fixed side mounting plate 2 Cassette mold 3 Hot runner device 4 Movable side mounting plate 10 Hot sprue 10a Resin passage 10b, 33d Inlet 10c Exit 21 Fixed mold 22 Movable mold 23A 1st horizontal mold 23B 2nd horizontal mold 24 Cavity 31 Manifold block 31a Resin passage 32 Band heater 33 Nozzle 33a Discharge port (outlet)
33b Tip 33c Resin passage 33e Root 33f, 34c Flange 33g Tip surface 34 Floating jacket 34a, 362a Through hole 34b Cylindrical 35 Leaf spring 36 Holding member 101 Receiving part 101a Concave surface 102 Supply part 361 Ring member 362 Base member

Claims (5)

The first and second molds for forming the cavity,
A hot runner device having a main body, a nozzle having a discharge port for discharging resin at the tip, and a floating jacket physically connected to the nozzle.
A holding member that holds the floating jacket so that it is not physically connected to the floating jacket and allows the floating jacket to move in the radial direction of the nozzle.
It is provided in the first mold, and is provided with a hot sprue to which the tip of the nozzle is abutted and has a first resin passage.
The first resin passage has an inlet for receiving the resin from the discharge port on the nozzle side and an outlet for pouring the resin in the first resin passage into the cavity on the cavity side. ,
The nozzle has the tip on the hot sprue side, while the nozzle has a root on the floating jacket side.
The root portion of the nozzle is slidably fitted into the through hole of the floating jacket with respect to the peripheral surface of the through hole of the floating jacket, and the nozzle moves in the radial direction of the nozzle together with the floating jacket. An injection molding apparatus that is capable of being movable in the axial direction of the nozzle with respect to the floating jacket . In the injection molding apparatus according to claim 1,
The injection molding device is characterized in that the nozzle is movable in the axial direction of the nozzle together with the floating jacket. In the injection molding apparatus according to claim 1 or 2.
The main body portion has a second resin passage for guiding the resin to the nozzle, and a through hole formed on the nozzle side of the main body portion and communicating with the second resin passage.
The nozzle extends from the base end side of the nozzle to the tip end side of the nozzle and has a third resin passage for guiding the resin to the hot sprue.
The third resin passage has an inlet for receiving the resin from the through hole on the base end side of the nozzle, while the discharge port is on the tip end side of the nozzle.
The nozzle is attached to the main body so that the entrance of the third resin passage faces the through hole of the main body.
An injection molding apparatus characterized in that the diameter of the entrance of the third resin passage is smaller than the diameter of the through hole of the main body portion. In the injection molding apparatus according to any one of claims 1 to 3,
The end surface of the hot sprue on the nozzle side is provided with a concave surface recessed on the cavity side.
The surface of the concave surface has a tapered surface located on the nozzle side and shrinking in diameter toward the cavity, and a curved surface having an arcuate cross section located on the cavity side and connected to the tapered surface.
The tip surface of the nozzle is provided on the side surface of the truncated cone that tapers toward the tip end side of the nozzle, and the surface of the spherical cap that is provided on the tip end side of the nozzle from the side surface of the truncated cone and is continuous with the side surface of the truncated cone. And have
The injection molding apparatus is characterized in that the side surface of the truncated cone is formed to have the same inclination as the tapered surface, while the surface of the spherical crown is formed to have the same curvature as the curved surface. .. In the injection molding apparatus according to any one of claims 1 to 4.
It is equipped with a rod member provided around the nozzle.
When the tip of the nozzle is abutted against the hot sprue, the end of the rod member on the first mold side abuts on the surface of the first mold on the hot runner device side. Injection molding equipment.

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