JPH038410Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an injection molding apparatus having a hot runner.

[Prior art and its problems] A typical injection molding machine consists of a pressure device that clamps the mold and an injection device in which the nozzle tip is located in the center of the die plate of the pressure device. .
In order to mold a relatively large molded product using this injection molding machine, a gate 501 is usually installed in the center of the mold 500, as shown in FIG. 3, which shows a cross section of the main part, and FIG. make. In this case, gate 5
This may be a problem for molded products in which internal strain is formed due to molecular alignment due to resin flow in areas close to 01. For this reason, conventionally, a long runner 506 is formed in the mold 505, as shown in FIG. 5, which is a plan view of one of the other split molds. In this case, the resin in the long runner 506 is wasted. In order to eliminate wastage of resin in the runner 506 portion, a hot runner mold 510 is used, of which FIG. 6 shows a cross section of the main part and FIG. 7 shows a plan view of one of the split molds. In this case, since the resin in the runner 511 portion does not solidify, the resin in the runner portion is not wasted. However, a hot runner portion 515 must be added to the mold body 516 for each mold, which increases mold cost. Furthermore, in the past, the nozzle tip 52 as shown in FIGS.
A special injection molding machine is known in which the arrangement of 1,531 is in a special position with respect to the pressurizing devices 520,530. However, special injection molding machines have the problem of being high in cost and lacking in versatility.

[Purpose of the invention] The present invention solves the above-mentioned problems and aims to provide an injection molding device having a hot runner that has the function of a special injection molding machine by utilizing a normal injection molding machine.

[Structure of the invention] An injection molding device having a hot runner of the invention includes an injection device having a nozzle for injecting a molten material, a pressurizing device having a fixed die plate and a movable die plate for opening and closing a mold. , a receiving runner part extending substantially parallel to the fixed die plate and having an inlet opening on one surface side of one end for receiving the supply of molten material from the nozzle; A hot runner comprising: a delivery runner portion that protrudes toward the die plate substantially parallel to the nozzle and has an outlet opening that abuts the spool opening of the mold; and a heating means that heats the receiving runner portion and the delivery runner portion. a locking member fixed to the fixed die plate and fixing the vicinity of the inlet opening of the receiving runner part; and a locking member that biases one surface side of the other end of the receiving runner part to close the outlet opening of the dispensing runner part. and a biasing portion for bringing the spool into close contact with the spool opening.

The injection molding device with a hot runner of the present invention is a conventional injection molding machine with a hot runner section, a locking member, and a biasing section added, and can be easily manufactured using a regular injection molding machine and is extremely versatile. Rich in sex.

The hot runner section extends substantially parallel to the die plate and includes a receiving runner section, a dispensing runner section, and a heating means. The receiving runner section has an inlet opening on one side of one end through which the molten material is supplied.
The delivery runner part is integrally formed with the receiving runner part, and has an outlet opening that projects from the surface opposite to the other end of the receiving runner part toward the movable die plate, substantially parallel to the nozzle, and comes into contact with the spool opening of the mold. has. The receiving opening is a portion that comes into contact with the nozzle of the injection device and receives the supply of molten resin and molten rubber from the nozzle. The outlet opening is a part that supplies molten material to the mold, and has a nozzle-like shape. The heating means is a means for keeping the receiving runner section and the delivery runner section warm. As the heating means, an electric heater, a heat medium circulation passage, etc. can be used.

The locking member is a means for fixing the hot runner section to the fixed die plate of the pressurizing device. This locking means must be able to withstand the urging force of the nozzle of the injection device that comes into contact with the receiving portion and the clamping force of the fixed mold. The locking member may be composed of a bolt and a nut if it is simple. It may also be constructed using a stopper, a spacer, etc. Usually, the stationary die of the mold is fixed to the die plate via a locking member, and the clamping force is transmitted to the mold via the locking member.

The biasing portion is a means for biasing the delivery runner portion of the hot runner portion toward the fixed spool opening. This biasing portion is interposed between the fixed die plate to which the locking member is fixed or the locking member and the hot runner portion, and presses the delivery runner portion of the hot runner portion toward the mold side. In order to make the pressing action of the biasing part more effective, it is preferable that the receiving runner part and the delivery runner part of the hot runner part be able to be slightly deformed. That is, it is preferable that the receiving runner part is firmly fixed to the fixed die plate so as to withstand the pressing force of the injection device, and the delivery runner part is deformed so as to be able to move slightly toward the mold side by the pressing force of the urging part. . As the biasing portion, a hydraulic cylinder such as a hydraulic pressure cylinder, an elastic body such as a coil spring, a leaf spring, etc. can be used.

[Operation of the invention] The injection molding apparatus having the hot runner of the invention locks the hot runner portion and the fixed die of the mold to the fixed die plate of the pressurizing device by means of a locking member. Next, the movable mold of the mold is fixed to the movable die plate in the same manner as in the conventional method. In this state, the biasing section is activated to force the delivery runner section of the hot runner section into strong contact with the spool opening of the mold. In this state, the molten material is injected from the nozzle of the injection device. The molten material injected from the nozzle is introduced through the inlet opening of the receiving runner section of the hot runner section, and is introduced into the spool of the mold through the outlet opening of the supply runner section. Note that the hot runner portion is heated to the melting temperature of the molten material by a heating means. Therefore, solidification of the molten material does not occur within the hot runner section. Furthermore, since the dispensing section is pressed by the urging section, there is little risk of molten material leaking from the boundary between the dispensing section and the mold. This allows molding by injecting the molten material into the spool opening of the mold located at a different position from the nozzle of the injection device.

[Embodiment] FIG. 1 shows a cross section of a main part of an injection molding apparatus having a hot runner according to a typical embodiment of the present invention.
The main part 1 of this device is located between a nozzle 3 of an injection device (not shown) that is a supply source of molten material and a mold 2 that forms a molded product, and a fixed die plate of a pressurizing device 4. It is fixed at 41. This main part 1 includes a hot runner part 11, a locking member 12, and a biasing part 1.
It consists of 3.

The hot runner part 11 is L-shaped and has an inlet opening 111 on one side of one end thereof, and a ring-shaped washer 112 surrounding this opening 111 forms a receiving runner part 113. In addition, a nozzle-shaped delivery runner part 114 is provided on the opposite surface of the other end.
is formed, and an outlet opening 115 is opened at the tip of this delivery runner section 114. A runner 116 is formed in the center of the hot runner section to communicate the inlet opening 111 and the outlet opening 115. Furthermore, a heater 117 is buried along the runner 116.

The locking member 12 includes a substrate 121, a spacer 122, a pressure receiving plate 123, and a presser foot 124. The substrate 121 is fixed to the fixed die plate 41 with bolts, and the spacer 122 and the pressure receiving plate 123 are fixed to the substrate 121 with bolts. Hot runner part 1
1 is a substrate 121, a washer 112, and a pressure receiving plate 123.
means that the substrate 121 and the pressure receiving plate 12 are connected via the presser foot 124.
It is sandwiched between 3.

The biasing part 13 includes a rod 131 protruding from the opposite side of the nozzle-shaped delivery runner part 114 of the hot runner part 11, a cylinder 132 provided in the substrate 121, and a cylinder 132 fixed to the other end of the rod 131 and inserted into the cylinder 132. This is a hydraulic device consisting of a piston 133. Incidentally, as the biasing portion, an elastic body such as a disc spring 135 can also be used, as shown in FIG. The biasing portion 13 biases the delivery runner portion 114 of the hot runner portion 11 in a direction away from the fixed die plate 41, that is, toward the spool opening of the fixed mold 21, which will be described next.

The mold 2 is composed of a fixed mold 21 and a movable mold 22. The fixed mold 21 is fixed to the pressure receiving plate 123 with bolts. This stationary mold 21 has a spool opening 211 at the upper end of the side facing the stationary die plate 41, and a short runner and cavity on the other side. The movable mold 22 is slidably held on the movable die plate 42 side. The pressurizing device 4 has the above-described fixed die plate 41, movable die plate 42, and hydraulic device 43 as main components.

In the injection molding apparatus having the hot runner of this embodiment having the above configuration, during injection molding, the molten material is transferred from the nozzle 3 of the injection molding machine to the hot runner section 1.
1 is injected into the inlet opening 111 of the inlet opening 1.
11, passes through the runner 116, enters the spool port 211 through the outlet opening 115, and is press-fitted into the cavity through the runner. Then, it is cooled and solidified in the cavity and molded. During this molding, the nozzle-shaped delivery portion 114 of the hot runner portion 11
The spool opening 211 of the fixed mold 21 is strongly biased by this. For this reason, the spool port 211
No molten material leaks out between the opening 115 and the outlet opening 115.

In addition, in the injection molding apparatus having the hot runner of this embodiment, the molding die is replaced with the main part 1 consisting of the hot runner part 11, the locking member 12, and the biasing part 13 attached, as in the special injection molding machine. Can be used. Further, the main part 1 can be removed from the injection molding apparatus having the hot runner of this embodiment and used as the original ordinary injection molding machine.

[Effects of the Invention] The injection molding apparatus having a hot runner of the present invention is constructed by assembling a hot runner part, a locking member, and a biasing part to the die plate of a normal injection molding machine. This allows the nozzle to be substantially moved to a position different from the nozzle position of the injection device. Therefore, an ordinary injection molding machine can be turned into a special injection molding machine with a special nozzle position relative to the pressurizing device of the injection molding machine. Further, the injection molding apparatus having the hot runner of the present invention is provided with a biasing section, and the biasing section can strongly bias the delivery runner section of the hot runner section that feeds the molten material into the mold against the mold. Therefore, molten material does not leak between the mold and the delivery runner section of the hot runner section.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part of an injection molding apparatus having a hot runner according to an embodiment of the present invention, and FIG. 2 is another modification of the biasing part of an injection molding apparatus having a hot runner according to the embodiment of FIG. FIGS. 3 to 9 show a conventional example, FIG. 3 is a sectional view of a main part showing a state in which an ordinary mold is attached to an ordinary injection molding machine, and FIG. Figure 5 is a plan view of the other mold, Figure 6 is a sectional view of the main part of the mold with a hot runner, and Figure 7 is one of the molds in Figure 6. A plan view of the mold, FIG. 8 is a cross-sectional view of a main part of a special injection molding machine with a mold attached, and FIG. 9 is a cross-sectional view of a main part of another special injection molding machine. 1... Main part, 11... Hot runner part, 11
1... Inlet opening, 113... Receiving runner section, 1
14... Delivery runner part, 115... Outlet opening,
12... Locking member, 13... Urging part, 2... Mold, 21... Fixed mold, 22... Movable type, 3... Nozzle, 4... Pressure device, 41... Fixed die plate , 42...Movable die plate.

Claims (1)

[Claims for Utility Model Registration] (1) An injection device having a nozzle for injecting molten material, a pressurizing device having a fixed die plate and a movable die plate for opening and closing a mold, and the fixed die plate and a receiving runner section extending substantially in parallel and having an inlet opening on one surface side of one end for receiving the supply of molten material from the nozzle; a hot runner part having a delivery runner part having an outlet opening that protrudes substantially parallel to the nozzle and comes into contact with the spool opening of the mold; and a heating means for heating the receiving runner part and the delivery runner part; and the fixed die. a locking member fixed to the plate and fixing the vicinity of the inlet opening of the receiving runner part; An injection molding device having a hot runner comprising: (2) An injection molding apparatus having a hot runner according to claim 1, wherein the biasing portion is a fluid pressure cylinder that generates biasing force by fluid pressure. (3) An injection molding apparatus having a hot runner according to claim 1, wherein the biasing portion is an elastic body that biases with elastic force.