JP3987453B2 - Hot runner nozzle mounting structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention belongs to a technical field related to a hot runner nozzle mounting structure constituting a hot runner system used in runnerless molding.
[0002]
[Prior art]
Runnerless molding using a hot runner system has the advantage of enabling high cycle molding and reducing molding costs, but the construction cost of the hot runner system is complicated and expensive, resulting in a high equipment cost. There is. For this reason, attempts have been made to make the hot runner system usable with other hot runner molds by making the hot runner system easily detachable from the hot runner mold.
[0003]
Conventionally, as a technique for making a hot runner system versatile, for example, those described below are known.
[Patent Document 1]
PCT WO00 / 53388 International Publication.
Patent Document 1 describes a unit in which a heater and a hot runner nozzle constituting a hot runner system are integrally assembled by a holding block.
[0004]
In the technique according to Patent Document 1, the hot runner system can be easily attached to and detached from the hot runner mold by unitization, and the mounting accuracy to various hot runner molds can be obtained by the holding block.
[0005]
[Problems to be solved by the invention]
In the technique according to Patent Document 1, when a tip of a hot runner nozzle is provided with a protruding tip that enters the gate, the relationship between the size of the portion of the tip that enters the gate and the size of the gate is precisely designed. Therefore, there is a problem that even if the mounting accuracy by the holding block is obtained, sufficient molding accuracy cannot be ensured (in other words, it is versatile only within a common gate structure). Further, although the hot runner system is unitized, it is fixedly attached to the hot runner mold, so that it is troublesome to frequently replace the hot runner system.
[0006]
The present invention has been made in consideration of such problems, and includes a hot runner nozzle mounting structure capable of responding to hot runner molds having different gate structures in a timely manner, and injection molding of the hot runner nozzle mounting structure. It is an object of the present invention to provide a method for handling a hot runner nozzle mounting structure, which is suitable for implementation.
[0007]
[Means for Solving the Problems]
In order to solve the above-described problem, the hot runner nozzle mounting structure according to the present invention employs the following means.
[0008]
That is, as described in claim 1, the protruding tip provided at the tip of the hot runner nozzle and entering the gate of the hot runner mold is configured to be detachable from the tip of the hot runner nozzle. A nozzle is attached to the injection molding machine and assembled non-fixed to the hot runner mold. A receiving seat for inserting the hot runner nozzle is interposed between the hot runner nozzle and the hot runner nozzle insertion hole of the hot runner mold, and the hot runner nozzle hot runner is interposed between the hot runner nozzle and the receiving seat. An adjustment member for adjusting the depth of insertion into the nozzle insertion hole is interposed.
[0009]
According to this means, the hot runner nozzle can be detached from the hot runner mold assembled non-fixedly, and a chip corresponding to the structure of the gate of the hot runner mold can be provided in the hot runner nozzle. In this means, the seat is positioned by receiving the insertion pressure of the hot runner nozzle, and the insertion depth of the hot runner nozzle into the hot runner nozzle insertion hole is adjusted by using the adjustment member.
[0010]
According to a second aspect of the present invention, a protruding tip provided at the tip of the hot runner nozzle and entering the gate of the hot runner mold is configured to be detachable from the tip of the hot runner nozzle. Attached to the holding block and assembled non-fixed to the hot runner mold. A receiving seat for inserting the hot runner nozzle is interposed between the hot runner nozzle and the hot runner nozzle insertion hole of the hot runner mold, and the hot runner nozzle hot runner is interposed between the hot runner nozzle and the receiving seat. An adjustment member for adjusting the depth of insertion into the nozzle insertion hole is interposed.
[0011]
According to this means, the hot runner nozzle can be detached from the hot runner mold assembled non-fixedly, and a chip corresponding to the structure of the gate of the hot runner mold can be provided in the hot runner nozzle. In this means, the seat is positioned by receiving the insertion pressure of the hot runner nozzle, and the insertion depth of the hot runner nozzle into the hot runner nozzle insertion hole is adjusted by using the adjustment member.
[0012]
According to a third aspect of the present invention, in the hot runner nozzle according to the first or second aspect, a plurality of chips having different sizes of portions entering the gate are provided for replacement.
[0013]
In this means, a chip to be used is selected from a plurality for replacement.
[0014]
Further, as described in claim 4, in the hot runner nozzle according to any one of claims 1 to 3, an attachment that enables attachment to an injection molding machine is provided at a rear end portion of the hot runner nozzle. It is characterized by that.
[0015]
In this means, the hot runner nozzle is mounted on the injection molding machine using an attachment.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of a hot runner nozzle mounting structure and its handling method according to the present invention will be described below with reference to the drawings.
[0017]
In this embodiment, a heater built-in type hot runner nozzle A is mounted on an injection nozzle B of an injection molding machine and assembled to a hot runner mold C.
[0018]
The hot runner nozzle A has a small diameter portion 1 having a relatively small diameter on the front end portion side and a large diameter portion 2 having a relatively large diameter on the rear end portion side, and is formed in a stepped cylindrical shape as a whole. Has been. A molten resin flow path 3 passes through the shaft center of the small diameter portion 1 and the large diameter portion 2. In the vicinity of the flow path 3 of the small diameter part 1 and the large diameter part 2, coil heaters 4 and 5 of independent heating systems that heat (keep heat) the molten resin in the flow path 3 are incorporated. A threaded portion 7 of a female screw to which the chip 6 is attached is engraved around the flow path 3 at the tip of the small diameter portion 1. The chip 6 includes a screw cylinder 6a in which a male screw screwed into the screw portion 7 is engraved, an end port 6b from which molten resin is discharged, a protrusion 6c that guides the molten resin discharged from the end port 6b, And a flange 6d for preventing the reverse flow of the molten resin discharged from the end port 6b. A coil heater 8 that heats (maintains) the molten resin in the chip 5 is built in the vicinity of the screw portion 7 of the small diameter portion 1. A male screw portion 10 to which a nut-shaped attachment 9 is attached is engraved on the outer peripheral portion of the rear end portion of the large diameter portion 2. The attachment 9 includes a nut portion 9a in which a female screw to be screwed into the screw portion 10 is engraved, a screw cylinder portion 9b in which a male screw is continuously engraved in the nut portion 9a, a nut portion 9a, and a screw cylinder portion. A channel hole 9c that penetrates 9b and communicates with the channel 3 described above, and an expanded portion 9d that is expanded in a tapered shape at the end of the channel hole 9c.
[0019]
The injection nozzle B of the injection molding machine has a spindle-shaped tip structure, and the hot runner nozzle A is mounted by attaching an appropriate member to the screw cylinder portion 9b of the attachment 9. That is, the peripheral portion of the expanded portion 9d of the attachment 9 becomes a touch of the injection nozzle B of the injection molding machine.
[0020]
In the hot runner mold C, a stepped hot runner nozzle insertion hole 11 through which the hot runner nozzle A is inserted communicates with the gate 12 and is opened. A ring-shaped receiving seat 13 is fixed to the hot runner nozzle insertion hole 11 with a screw 14. The seat 13 includes a bottom plate 13a formed in a disk shape with a material having a good thermal insulation and a shock absorbing function, and a ring-shaped receiving plate 13b to which the bottom plate 13a is fitted. The inner diameter of the seat 13 is formed to be slightly larger than the outer diameter of the small diameter portion 1 of the hot runner nozzle A.
[0021]
The hot runner nozzle A of this embodiment is attached to an injection nose B of an injection molding machine by an attachment 9 and is pushed into the hot runner nozzle insertion hole 11 (receiving seat 13) of the hot runner mold C so as not to be fixed. Assembled to.
[0022]
In the injection molding, first, the nozzle 6 of the injection molding machine is moved backward from the hot runner mold C, and the chip 6 is attached to the screw portion 7 of the hot runner nozzle A that is moved back together with the nozzle B of the injection molding machine. This attachment is an easy task in a space where the surroundings are open. Therefore, it is possible to easily and frequently attach and remove the chip 6. As shown in FIG. 2, a plurality of the hot runner nozzles A with different sizes a, b, c of the protrusion 6c of the tip 6 of the chip 6 entering the gate 12 of the hot runner mold C are prepared. Thus, the chip 6 corresponding to the gate 12 can be selectively used. Therefore, it is possible to maintain the relationship between the size of the portion of the chip 6 that is precisely designed to enter the gate 12 and the size of the gate 12, and high molding accuracy can be obtained. In addition, since attachment and removal of the chip 6 can be performed by a screwing rotation operation, the attachment and removal work is not troublesome.
[0023]
Thereafter, the nozzle B of the injection molding machine is advanced into the hot runner mold C. At this time, the receiving seat 13 receives and buffers the insertion pressure of the hot runner nozzle A that has advanced together with the nozzle B of the injection molding machine, and positions the insertion of the hot runner nozzle A. At the time of this advancement, the adjustment member 15 is fitted near the step portions of the small diameter portion 1 and the large diameter portion 2 of the hot runner nozzle A as necessary. The adjusting member 15 includes a small-diameter portion 15a that is externally fitted to the small-diameter portion 1 of the hot runner nozzle A and inscribed-fit to the receiving plate 13b of the receiving seat 13, and a large-diameter portion 2 of the hot runner nozzle A. The whole is formed in a stepped cylindrical shape by the large-diameter portion 15b that circumscribes and fits. Therefore, the insertion depth of the hot runner mold C of the hot runner nozzle C into the hot runner nozzle insertion hole 11 (depth of penetration of the chip 6 into the gate 12) can be adjusted by fitting the adjustment member 15. . As shown in FIG. 4, the adjusting member 15 has a plurality of shaft lengths Lb, Lc, and Ld, so that the adjustment member 15 corresponds to the shaft length La of the small diameter portion 1 of the hot runner nozzle A. It is convenient to select and use. The fitting form of the small-diameter portion 15a of the adjusting member 15 is such that the inflow is solidified between the small-diameter portion 1 (tip 6) of the hot runner nozzle A and the hot runner nozzle insertion hole 11 or the receiving seat 13 of the hot runner mold C. The gap S for enhancing the thermal insulation with the finished resin is secured.
[0024]
When the hot runner nozzle A is assembled to the hot runner mold C, the chip 6 enters the gate 12 to properly regulate the flow rate of the molten resin and to improve the appearance of the product gate.
[0025]
As described above, in addition to the illustrated embodiment, the chip 6 can be detachable with a structure other than screwing (for example, slide engagement).
[0026]
It is also possible to attach the seat 3 to the hot runner nozzle A.
[0027]
Further, it is possible to attach the hot runner nozzle A to another part of the injection molding machine with the attachment 9.
[0028]
Further, by providing the female screw of the injection nozzle B without using the attachment 9 and forming the outer periphery of the rear end portion of the hot runner nozzle A as a nut outer shape, the male screw 10 can be directly screwed and attached.
[0029]
Furthermore, a hot runner nozzle A is attached to a holding block as shown in Patent Document 1, and a tip 6 corresponding to the size and shape of the gate of the hot runner mold C is provided on the tip end side of the hot runner nozzle A. It is also possible to exchange.
[0030]
【The invention's effect】
As described above, in the hot runner nozzle mounting structure according to the present invention, the hot runner nozzle is detached from the non-fixed hot runner mold, and a chip corresponding to the hot runner mold gate structure is provided. Since it can be provided in the hot runner nozzle, there is an effect that it is possible to cope with hot runner molds having different gate structures in a timely manner.
[0031]
Further, the method of handling the hot runner nozzle mounting structure according to the present invention is such that the injection molding machine is moved backward from the hot runner mold to mount the chip, and the injection molding machine is advanced to the hot runner mold to insert the chip into the gate. Therefore, there is an effect that the attachment and removal of the chip can be performed easily in a space where the periphery is open.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a mounting state showing an embodiment of a hot runner nozzle and a hot runner nozzle mounting structure according to the present invention.
2 is a side view showing the structure of the main part of FIG. 1. FIG.
3 is a side view showing a structure of a main part of another main part of FIG. 1. FIG.
4 is a side view showing a structure of a main part of still another main part of FIG. 1. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Small diameter part 2 Large diameter part 3 Flow path 4 Coil heater 5 Coil heater 6 Tip 9 Attachment 11 Hot runner nozzle penetration hole 12 Gate 13 Seat 15 Adjustment member A Hot runner nozzle B Injection nozzle C of injection molding machine Hot runner mold

Claims (4)

A projecting tip provided at the tip of the hot runner nozzle and entering the gate of the hot runner mold is configured to be detachable from the tip of the hot runner nozzle, and the hot runner nozzle is attached to the injection molding machine. A hot runner nozzle mounting structure that is non-fixedly assembled to the mold ,
A receiving seat for insertion of the hot runner nozzle is interposed between the hot runner nozzle and the hot runner nozzle insertion hole of the hot runner mold, and the hot runner nozzle hot runner nozzle is interposed between the hot runner nozzle and the receiving seat. A hot runner nozzle mounting structure, characterized in that an adjustment member for adjusting an insertion depth into the insertion hole is interposed. A projecting tip provided at the tip of the hot runner nozzle and entering the gate of the hot runner mold is configured to be detachable from the tip of the hot runner nozzle, and the hot runner nozzle is attached to the holding block. A hot runner nozzle mounting structure that is non-fixedly assembled to the mold ,
A receiving seat for insertion of the hot runner nozzle is interposed between the hot runner nozzle and the hot runner nozzle insertion hole of the hot runner mold, and the hot runner nozzle hot runner nozzle is interposed between the hot runner nozzle and the receiving seat. A hot runner nozzle mounting structure, characterized in that an adjustment member for adjusting an insertion depth into the insertion hole is interposed.   3. The hot runner nozzle mounting structure according to claim 1, wherein a plurality of chips having different sizes of portions that enter the gate are provided for replacement.   The hot runner nozzle mounting structure according to any one of claims 1 to 3, wherein an attachment that enables attachment to an injection machine is provided at a rear end portion of the hot runner nozzle. .

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