JP3134184B2 - Injection mold equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection mold apparatus.

[0002]

2. Description of the Related Art As is well known, the supply of a molding resin to an injection molding die is performed by connecting a nozzle of a molding machine body to a sprue bush provided on a fixed die. The molding resin supplied from the nozzle is molded by injecting it from a sprue through a runner into a cavity. At this time, the alignment between the center of the nozzle of the molding machine main body and the sprue is performed via a locate ring provided so as to press the rear end of the sprue bush.

[0003] Generally, many of the sprue bushings and the locate ring are commercially available, and the types thereof are diversified. However, as a fixing structure of the locate ring, FIG.
As shown in (1), a screw fixing method in which two to four fastening screws are used to fasten the fixed-side mounting plate 51 is adopted.

In FIG. 3A, a locate ring 52 is fixed to a fixed mounting plate 51 by a plurality of mounting screws 53, and a sprue bush 54 is fixed to the fixed mounting plate 51 by the locate ring 52. An example is shown.

FIG. 3B shows a case where the adapter ring 55 is interposed when the inner circumference of the positioning ring of the molding machine main body is larger than the outer diameter of the locate ring 52. In this example, an example is shown in which the adapter ring 55 is also fixed to the fixed-side mounting plate 51 by a plurality of mounting screws 55 similarly to the locate ring 52.

Further, in FIG. 3 (c), the locate ring 52 is fixed to the fixed side mounting plate 51 by mounting screws 53 similarly to FIGS. 3 (a) and 3 (b).
Reference numeral 5 shows an example in which setscrews 57 are fixed to a plurality of female screw holes 55b provided from the outer peripheral portion toward the center, respectively.

[0007]

As described above, since both the locate ring and the adapter ring in the injection molding die apparatus employ a fixing structure using a plurality of screws, replacement of the locate ring and the sprue bush is required. There is a problem that the trouble in the case of is troublesome. In addition, there is a case that the screw fixing may be forgotten after being covered with the locate ring, etc.In such a case, the locate ring may fall off during the installation of the mold or the rotor ring may not fit into the locate hole of the molding machine body. There is a problem that may cause inadvertent operation, such as leaving behind.

[0008]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention eliminates the need for a plurality of screwing operations as in the case of fixing with a mounting screw, and reduces the opposing surfaces of the two. Multiple permanent magnets are buried on the opposing surface of the fixed-side mounting plate and the locate ring so that high-precision fixing is possible by closely contacting them. The attracting force of these permanent magnets fixes the locate ring to the fixed-side mounting plate. I did it.

Also, in the case of an injection mold apparatus for positioning the nozzle and the sprue bush with an adapter ring interposed on the outer periphery of the locate ring, the adapter ring is embedded in the opposed surface of the fixed side mounting plate and the adapter ring. It may be fixed by the attractive force of a permanent magnet. In this case, in order to eliminate the screwing work, both the locate ring and the adapter ring can be fixed by the attraction force of the permanent magnet.

[0010]

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a nozzle for an injection molding machine.
A sprue bush connected, secured of a solid Jogawa mounting plate
Interposed between the nozzle and the sprue bush
And a b <br/> locate ring for positioning the said nozzle and the sprue bushing, the locating ring is buried in the surface facing the said solid <br/> Jogawa mounting plate and the locating ring the suction force of the permanent magnet is obtained by fixing to the fixed side mounting plate. The permanent magnet may be either embedded in the back of the fixed-side mounting plate or embedded in the front of the locate ring.

Further, the present invention is, with the nozzle of the injection molding machine
A sprue bushing to be sintered, immobilized on a solid Jogawa mounting plate
Interposed between the nozzle and the sprue bush
Serial and a location <br/> Toringu and A <br/> Daputaringu fitted to the outer periphery of the locating ring for positioning the nozzle and the sprue bushing, the adapter ring, the fixed-side mounting plate and the adapter better to be fixed to the fixed side mounting plate by the adsorption force of the permanent magnets are embedded in the surface facing the ring. In this case, the permanent magnet is embedded in the facing surface of the fixed-side mounting plate and the adapter ring, but is desirably embedded in the facing surface of both the fixed-side mounting plate and the locate ring and the adapter ring.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the basic configuration of the injection mold apparatus according to the present invention is the same as that of the prior art. Therefore, the configuration of each part will be described in the range necessary for the description of the present invention, and the description of parts not directly related will be simplified or omitted.

The injection mold apparatus includes a fixed mold P and a movable mold Q, and a cavity C can be formed between the molds when the mold is clamped as shown in the figure.

The fixed mold P has three plates, each of which includes a fixed mounting plate 1, a runner stripper plate 2 in contact with the front surface thereof, and a fixed mold plate 3 in contact with the front surface thereof. A concave portion 1a provided at the center of the fixed side mounting plate 1 and the runner stripper plate 2;
A sprue bush 4 is fitted into 2a so as to penetrate both. A substantially conical concave portion 4a is formed on the back side of the sprue bush 4, and a sprue 4b is provided at the tip thereof. The tip of the sprue 4b is a runner portion 3a formed between the runner stripper plate 2 and the fixed-side mold plate 3 when the mold is clamped.
Can be communicated with.

The rear end of the sprue bush 4 is formed in a step shape, and the end surface of the large diameter portion is made flush with the rear surface of the fixed side mounting plate 1. The cylindrical portion 4c, which is a small-diameter portion, protrudes from the rear surface of the fixed-side mounting plate 1 by a predetermined length. A locate ring 5 for positioning the nozzle of the molding machine main body is provided on the step portion of the sprue bush 4.
Can be fitted. The sprue bush 4 cannot be dropped from the fixed mold P by fixing the locate ring to the fixed mounting plate 1.

The fixing of the locate ring 5 to the fixed side mounting plate 1 is performed by tightening two to four mounting screws from the rear side of the locate ring (not shown).

Since the outer diameter of the locate ring 5 shown in FIG. 1 is smaller than the positioning recess of the nozzle of the molding machine main body, an adapter ring 6 is interposed on the outer periphery of the locate ring. The adapter ring 6 has the same thickness as the locate ring 5, and a locate hole for positioning the nozzle of the molding machine main body can be fitted to the adapter ring.

Two to four permanent magnets 7 (only one is shown) are embedded at equal angular intervals on the surface of the adapter ring 6 facing the fixed mounting plate 1. The fixing of the adapter ring 6 to the fixed side mounting plate 1 is performed by the attraction force of these permanent magnets 7. In the case of this embodiment, each of the permanent magnets 7 is provided with two to four recesses 6a at equal angular intervals on the front side of the adapter ring 6 and is buried in each of these recesses so that the permanent magnet 7 cannot be dropped off with an adhesive or a screw. It is fixed to.

The mounting operation of the adapter ring 6 only requires the outer peripheral portion of the locate ring 5 and the inner peripheral portion of the adapter ring to be aligned and pushed in, and it is necessary to align the screw holes as in the case of screw fixing. In addition, since the screwing operation according to the number of the two to four tightening screws is not required, the attaching / detaching operation becomes extremely simple.

In addition to the above-described configuration, the injection mold apparatus includes a movable-side mold plate Q, a spacer block 9, a receiving plate 10, and a movable-side mold plate 11. A core 12 is attached to the movable mold plate 11. When the mold is clamped, the core and the cavity 3 b of the fixed mold plate 3 are attached.
Thus, the cavity C can be formed. The spacer block 9 has an ejector plate 13 and a projecting mechanism including an ejector pin 14 and a runner ejector pin 15 erected on the ejector plate 13.

The movable mold plate 11 is provided with upright guide pins 16 for positioning the mold plates 3 and 11 when the mold is clamped, and is fixed to the fixed-side mounting plate 1 when the mold is opened. Support pins 17 for guiding the side mold plate 3 and the runner stripper plate 2 are erected so as to be inserted into the movable mold Q.
In addition, general components such as a puller bolt 18 and a runner lock pin 19 are provided.

Next, another embodiment will be described with reference to FIG. FIG. 2A shows a case where an adapter ring is interposed in the locate ring 25 as in the case of FIG.
The locate ring 25 is fixed by screwing, and a permanent magnet 27 for fixing the adapter ring 26 is embedded in the fixed-side mounting plate 21. FIG. 2 (b)
The figure shows the case where the adapter ring is not interposed, but the case where the permanent magnet 37 is embedded on the front side of the locate ring 35. FIG. 2C shows a case where a permanent magnet 47 is buried on the back surface of the fixed-side mounting plate 41. In any case, locate rings 35 and 45 are connected to sprue bush 3
The fixing of the adapter ring is extremely simple because it is fixed only by fitting it into the outer periphery of the cylindrical portion of the 4, 44.

In addition, in the case of FIGS. 1 and 2 (a), permanent magnets are embedded in the opposing surfaces of the fixed side mounting plates 1, 21 and the locate rings 5, 25 to attract the permanent magnets. The locate ring may be fixed by force.

The present invention can be applied not only to the illustrated injection molding apparatus but also to other types of injection molding apparatus such as a cassette type injection molding apparatus.

[0025]

According to the present invention, the locate ring can be fixed to the fixed-side mounting plate by the attraction force of the permanent magnet embedded in the opposite surface of the fixed-side mounting plate and the locate ring. It will be easier. Also,
When the adapter ring is interposed on the outer circumference of the locate ring, permanent magnets are buried in the facing surface of the adapter ring and the fixed-side mounting plate, so that the adapter ring can be easily fixed to the fixed-side mounting plate. become. If permanent magnets are buried in the fixed-side mounting plate and the facing surfaces of both the locate ring and the adapter ring, and both of them are fixed to the fixed-side mounting plate by the attractive force of the permanent magnet, further fixing work is required. Make it easier. Since the fixing work by screwing is eliminated, there is no danger of forgetting the screwing work.Therefore, the locating ring or adapter ring may drop during the mounting work of the mold device, or may remain in the locating hole of the molding machine body. This has the effect of eliminating the inconvenience of doing so.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an overall configuration of an embodiment of the present invention.

FIG. 2 is a partial sectional view showing an example of a structure for fixing a locate ring and an adapter ring in another embodiment.

FIG. 3 is a partial cross-sectional view showing a fixing structure of a locate ring and an adapter ring in a conventional technique.

[Explanation of symbols]

 1,21,31,41 Fixed-side mounting plate 4,24,34,44 Sprue bush 5,25,35,45 Locate ring 6,26 Adapter ring 7,27,37,47 Permanent magnet

Claims (2)

(57) [Claims] 1. A and sprue <br/> over bushing connected to the nozzle of the injection molding machine, the solid Jogawa mounting plate in a fixed the nozzle and the upper
Interposed between the sprue bush and the above nozzle and the above
And locating ring for positioning the sprue bush
A, the locating ring is injection mold, characterized in that the suction force of the permanent magnets are embedded in the surface facing the said fixed side mounting plate and the locating ring is fixed to the stationary side mounting plate Mold device. Wherein the sprue <br/> over bushing connected to the nozzle of the injection molding machine, the solid Jogawa mounting plate in a fixed the nozzle and the upper
Interposed between the sprue bush and the above nozzle and the above
A locate ring for positioning the sprue bush and
An adapter ring fitted to the outer periphery of the above-mentioned locate ring ;
Has, the adapter ring is injection molded, characterized in that the suction force of the permanent magnets are embedded in the surface facing the said fixed side mounting plate and the adapter ring is fixed to the stationary side mounting plate Mold equipment.