JPH0546898Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to the structure of a resin injection port of a resin molding mold into which thermoplasticized synthetic resin is injected from the tip of the nozzle of a resin molding machine. This prevents various problems caused by stringing of the resin when releasing the resin molded product.

[Prior Art] FIG. 7 is a cross-sectional view schematically showing a contact state between a nozzle tip and a mold in a conventional resin molding machine such as an injection molding machine. That is, the thermoplastic synthetic resin 102 transferred from the resin molding machine main body (not shown) via the cylinder 101 is transferred to the nozzle 103.
The liquid is injected from the tip of the mold through the spout 104 into the injection port 106 of the mold 105 (which is also the tip of the sprue runner portion of the mold). The tip of the nozzle 103 and the mold 105 are brought into close contact with each other at a contact portion 107 without causing any resin leakage, and are capable of being separated from each other. Furthermore, in Figure 7,
108 is a mold mounting die plate;
9 is a rocket ring.

[Problem to be solved by the invention] In the structure of the injection port of the conventional resin molding mold described above, when the molded product is demolded, the cooled and solidified tip of the sprue runner (corresponding to the injection port 106) The separation of the thermoplastic resin in the nozzle spout 104 (resin) and the thermoplastic resin in the nozzle spout 104 is poor, and as shown in FIG. 111 often occurred. Note that 112 is a gate, and 113 is a molded product.

Such threading portions 111 may cause damage to the mold by adhering to the nozzle contact portion 107 of the mold or the mold parting surface, or may cause product defects due to clinging to the product 113. This had the disadvantage of

The present invention has been developed to solve the above-mentioned problems, and provides a mold that allows for good separation of the resin at the tip of the sprue runner when releasing a resin molded product and prevents the occurrence of long strings. The purpose of this invention is to provide a structure for a resin injection port.

[Means for Solving the Problems] In order to solve the above-mentioned problems and achieve the above objectives, the structure of the resin injection port in the resin molding mold of the present invention is designed to be similar to that of the resin molding machine. The nozzle tip is in tight pressure contact with the resin injection port of a resin molding mold, where the tip of the nozzle can be releasably moved, and the outer surface matches the surface shape of the nozzle tip of the resin molding machine, and the inner surface is in tight pressure contact with the nozzle of the mold. A partition body consisting of a plate body that matches the surface shape of the part and has a hole in the center, and a partition that divides the hole of the plate body into a plurality of parts to form a plurality of resin passage holes is detachably attached. The configuration is such that

Further, the partition body may be detachably screwed onto the resin injection port of the mold.

[Example] Hereinafter, the configuration of the present invention will be described in detail based on an example.

FIG. 1 is a schematic sectional view showing an embodiment of the present invention. In Fig. 1, 1 is the nozzle of the resin molding machine, the tip of which is in close contact with the nozzle tight pressure contact area 6 of the mold 3 so as to be releasable, and the thermoplastic composite transferred from the resin molding machine body. The resin is poured into the spout 2 of the nozzle.
The resin is injected into the resin injection port 4 located at the center of the nozzle tight pressure contact area 6 of the mold 3 through the resin.

The resin injection port 4 is provided with a partition body 7 consisting of a partition 5 and a plate 8 for dividing the injection port 4 into a plurality of parts. The partition 5 is divided into two parts by a plate-shaped body.
The structure may be divided into parts, three parts, four parts, etc., or may be composed of a lattice body, a mesh body, or the like.

FIG. 2 relates to another embodiment of the present invention, and FIG. 3 is a sectional view showing its use. That is, the outer surface 8a of the plate 8 constituting the partition 7 matches the surface shape of the tip of the nozzle 1 of the resin molding machine, and the inner surface 8b of the plate 8 matches the nozzle tight pressure contact area 6 of the mold 3.
A hole 9 for resin passage is provided in the center of the plate 8, and the hole 9 has a
A partition 5 is provided to divide the image into a plurality of parts.

The partition 7 is removably attached to the resin injection port 4 of the mold 3, and the thermoplastic synthetic resin that has passed through the injection port 2 of the nozzle 1 is divided into a plurality of parts by the partition 5, and is divided into a plurality of parts by the partition 5. The resin is injected into the mold 3 from the resin injection port 4 onwards.

Reference numeral 10 denotes a fitting member integrated with the partition 5, which is fitted into the injection port 4 of the mold 3 and detachably attaches the partition body 7 to the resin injection port 4 of the mold 3. The partition body 7 and the mold 3 may be attached by detachable adhesive means or other means.

FIG. 4 shows the plate-shaped fitting member 10 in FIG.
Instead, the fitting cylinder 11 is placed on the inner surface 8b of the plate 8.
This shows another embodiment of the partition body 7 provided at the center of the resin injection port 4, in which a fitting cylinder 11 is fitted into the resin injection port 4, and the partition body 7 is detachably attached to the injection port 4.

FIG. 5 relates to another embodiment of the present invention, and FIG. 6 is a sectional view showing its use. That is, the outer surface 13a of the member 13 constituting the partition body 12 matches the surface shape of the nozzle tip of the resin molding machine, and a hole 14 for resin passage is provided in the center of the member 13. A partition 5 is provided to divide the hole 14 into a plurality of parts. The partition body 12 is the mold 3
The thermoplastic resin that has passed through the injection port 2 of the nozzle 1 is divided into a plurality of parts by the partition 5 and then separated into the partition body 12.
The resin is injected from the hole 14 into the resin injection port 4 of the mold 3 and beyond.

[Effects of the invention] In the structure of the resin injection port in the resin molding mold of the invention having the above-mentioned configuration, since a partition is provided in the resin injection port of the mold, the nozzle of the resin molding machine After the thermoplastic synthetic resin is injected into the mold from the tip, when the molded product is released, the heat of the cooled and solidified sprue runner tip (resin corresponding to the resin injection port of the mold) of the molded product is released. The plasticized synthetic resin is divided into multiple parts and separated, the surface area of the divided synthetic resin increases by more than several times, and the divided synthetic resin rapidly cools and solidifies under the action of the surrounding cooling atmosphere. However, the tip of the sprue runner and the injection port of the nozzle are immediately cut and separated, eliminating the occurrence of long strings as described in the conventional example, and accordingly preventing damage to the mold and product defects. It is possible.

Furthermore, since the partition is removable, no special design changes are required, regardless of the size of existing resin molding molds or even for newly manufactured resin molding molds. In addition, the effect of the partition described above can be achieved very easily and at low cost.

In addition, when the partition body is removably screwed to the resin injection port of the mold, the resin injection port of the mold and the partition body are screwed together integrally and without leakage of the thermoplastic synthetic resin. , the nozzle tip of the resin molding machine and the partition body are brought into close pressure contact, and the partition of the partition body causes
It is possible to prevent the occurrence of stringy parts as described above and the various problems caused by them. Furthermore, by simply changing the diameter of the partition, etc., it is possible to easily accommodate resin molding molds of various sizes.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view showing an embodiment of the present invention;
Fig. 2 is a schematic perspective view showing one embodiment of the partition body according to the present invention, Fig. 3 is a sectional view showing the usage state of the partition body shown in Fig. 2, and Fig. 4 is a partition body according to the present invention. FIG. 5 is a schematic perspective view showing another embodiment of the partition body according to the present invention, and FIG. 6 is a cross-sectional view showing the usage state of the partition body shown in FIG. 5. Fig. 7 is a schematic cross-sectional view showing the state of contact between the nozzle tip and the mold in a conventional resin molding machine, and Fig. 8
The figure is a perspective view showing an example of a molded product released from a conventional resin molding die. 1... Nozzle, 2... Inlet, 3... Mold, 4
... Resin injection port, 5 ... Partition, 6 ... Nozzle tight pressure contact area, 7 ... Partition body, 8 ... Plate body, 9 ... ...
Hole, 12... Partition body, 13... Member, 14...
Hole.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) The resin injection port of a resin molding mold, in which the nozzle tip of a resin molding machine is in close pressure contact with the resin molding machine in a releasable manner, has an outer surface that has the surface shape of the nozzle tip of the resin molding machine. A plate body whose inner surface matches the surface shape of the nozzle tight pressure contact area of the mold and has a hole in the center, and a plurality of resin passage holes by dividing the hole of the plate body into a plurality of parts. A structure of a resin injection port in a mold for resin molding, characterized in that a partition body consisting of a partition forming a partition is detachably attached. (2) The structure of a resin injection port in a resin molding mold according to claim 1 of the utility model registration, characterized in that the partition body is removably screwed onto the resin injection port of the mold.