JPS60225725A - Injection molding - Google Patents

Abstract

PURPOSE:To restrain higher cost generated in a later process, to prevent a molded article from being deformed and damage under the easier control by loading molded articles on a conveyor to carry the molded articles from the inner part of a mold to the outer part thereof. CONSTITUTION:The conveyor 18 has the pilot holes 19 to engage with the sprockets of the gear 15 and the holes 23 to engage with the dent 17 provided on the lower surface of the joint part 7 of the molded article at fixed intervals in the advancing direction. The joint 7 of the molded article is connected with the conveyor 18 so that the dent 17 is inseted into the before-mentioned hole 23. Since the molded articles can be taken out of the mold as the molded article is set to the coneyor, the use of the part feeder and the bagging of the molded articles are not executed in a later process. Therefore, the higher cost in the later process can be restrained and the molded article is prevented from being deformed and damaged.

Description

[Detailed description of the invention] 〔Technical field〕 The present invention relates to an injection molding method for molded articles made of synthetic resin.

[Background technology]

Conventionally, synthetic resin molded products have been molded one by one in a pair of molds 1 and 2, as shown in FIG. 1, and then supplied as a single unit to subsequent processes. Therefore, in post-processes such as assembly, it is necessary to use a parts feeder for each molded product in order to align the molded products, and molded products with complex shapes should not be placed on the parts feeder. As a result, it had to rely on human labor, which led to an increase in costs.

■If a parts feeder is used for molded products or if the molded products are packed in bags, the molded products may be deformed or damaged.

■When temporarily storing molded products, pallets and bags are required, making management difficult.

There were drawbacks such as:

[Purpose of the invention]

Therefore, the purpose of this invention is to provide an injection molding method that can suppress the cost increase that occurs during post-processing, does not cause deformation or damage to the molded product, and can be easily managed. [Disclosure of the Invention] In order to achieve the above object, the inventors have made extensive studies and have completed this invention.

The present invention is an injection molding method that includes a step of injection molding a molded article in a pair of molds, and a step of sending the molded article obtained by this step to another part of the mold, The gist thereof is an injection molding method characterized in that the molded product is attached to a conveying member that transports the molded product from inside the mold to outside the mold. Hereinafter, an embodiment thereof will be described in detail based on the accompanying drawings.

FIG. 2 shows an apparatus used in the injection molding method according to the present invention. As shown in this figure, inside the molds 3 and 4, there is a molded product body 6. A mold part 9 is provided in which a connecting part 7 connected to a conveying material 18 at the front and a pin fixing part 8 which fixes a conveying pin 11 extending from a rear conveying device 10 are integrally molded to form a molded product 5. There is. 12 is sprue,
Reference numeral 13 denotes an ejector pin that pushes up the molded product 5 from the mold section 9. Between the molds 3.4 in front of the mold part 9, a punch 14 biased downward by a spring 13 is placed above the molded product connecting part 7 and the conveyed material 18 so as to connect them.
is provided. The connection state between the molded product connecting portion 7 and the conveyed material 18 will be described in detail later. Outside the molds 3 and 4 in front of the punch 14, there is a gear 1 that drives the conveyed material 18 so as to take out the molded product 5 from between the molds 3 and 4 to the outside.
5 and a support roller 16 that rotatably presses and supports the molded products 5 between the gear 15 and the gear 15. Further in front of these gears 15 and support rollers 16, there is provided a take-up reel (not shown) that winds up the molded products 5 along with the conveyed material 18 as shown by chain lines.

As shown in FIG. 7, the conveyed material 18 has a pilot hole 1 for receiving the sprocket of the gear 15 shown in FIG.
9, and holes 23 for receiving the convex portions 17 formed on the lower surface of the molded product connecting portion 7 at regular intervals in the traveling direction. The molded product connection part 7 has a convex part 1
7 is fitted into the hole 23 to be connected to the conveyed material 18.

Next, an injection molding method using the above apparatus will be explained. First, with the mold closed, molten resin flows into the mold,
A molded article 5 as shown in FIG. 3 is molded. The molded product 5, together with the molded product main body 6, has a connecting portion 7 with the conveyed material 18. The pin fixing portion 8 and the tip of the conveying pin 11 are also integrally molded at the same time. The connecting portion 7 has a convex portion 17 formed on its lower surface. Simultaneously with the molding of the molded product 5, the already formed molded product 5 and the conveyed material 18 are connected in front of the molded product 5.

Next, as shown in FIG. 4, when both the molds 3 and 4 are opened, the molded product 5 is ejected by the ejector bin 13. At this time, the molded product pin fixing portion 8 is The conveying pin 11 of the conveying device IO has been in a fixed state for a long time.Therefore, as shown in FIG. The molded products 5, 5 on the conveyed material 1s are sent to another part in the front molds 3, 4. At the same time, the molded products 5, 5 on the conveyed material 1s are moved by the gear 15 shown in FIG. By moving the conveyance material 18, one molded product is sent out in the mold direction (forward).The molded products 5 that are being sent out may be sent to the subsequent process as they are, or
It may also be wound on a reel. On the other hand, as shown in FIG. 6, the molded product 5 sent to another part of the molds 3 and 4 is constantly urged upward by the spring 20 as the molds 3 and 4 begin to close. The conveyor pin 11 is supported by the molded article support block 21 which is located at the molded article support block 21, thereby causing the conveyor pin 11 to retreat.

Thereafter, the mold 3.4 is completely closed, as shown in FIG. At the same time, a new molded product 5 is molded by injection molding of molten resin.

Note that the molded product attached to the conveyance material and transported is not necessarily limited to a molded product molded only from resin, and may be a molded product having an insert component.

In the embodiment, the conveyance pin supported the rear part of the molded product, but the position where the molded product is supported by the conveyance pin is not limited to the above-mentioned locations. For example, as shown in FIG. 7, grooves 22 may be provided on both sides of the molded product body 6 to be supported by conveying pins (not shown). However, the structure supported by the conveyance pin is not limited to the above structure, and may be a structure such as a pin hole.

In the example, the structure in which the molded product is attached to the conveying material is as follows:
The structure was such that the molded product connection portion had a convex portion on its lower surface, and the conveying material had a hole corresponding to the convex portion. However, it is not limited to this. For example, as seen in FIG. 8 (al), a convex portion 24' on the lower surface of the connecting portion 24 is swollen downward, and a concave portion 26 corresponding to the convex portion 24' is formed on the upper surface of the conveyed material 25. Structure being formed, 8th
As shown in FIG.

In the example, the connection portion was formed for each molded unit. However, as shown in FIG. 9, there are cases in which four molded products 31 are molded at once, and the connection part 32 with the conveying material 33 is formed only in the middle part of the four molded products. A connection portion may be formed in a multi-piece molded product that is molded in large numbers, and the structure in which the molded product is attached to the conveyed material is not limited to the above-mentioned fitting structure. For example, as shown in FIG. 10, a conveyed material 35 coated with an adhesive 34
A structure on which the molded product 36 is adhered, or a structure in which the molded product 36 is fitted into the recess 38 of a conveyor 37 provided with a recess 38 corresponding to the shape of the molded product 36, as shown in FIG. etc. is fine. Alternatively, as shown in FIG.
It is also possible to provide a conveying material 40 that is conveyed in a direction perpendicular to the direction in which the material 6 is conveyed.

〔Effect of the invention〕

As described above, the injection molding method according to the present invention includes a step of injection molding a molded product in a pair of molds, and a step of sending the molded product obtained by this step to another part of the mold. This is an injection molding method in which the molded product is attached to a carrier material that transports the molded product from inside the mold to the outside of the mold. Because it is designed to be taken out, in the subsequent process,
Since a parts feeder is not used and the molded product is not packed in bags, it is possible to suppress the increase in cost that occurs during post-processing, and there is an effect that the molded product is not deformed or damaged. Moreover, the effect of easier management is also brought about. Furthermore, when removing a defective molded product, it can be easily removed by simply disconnecting it from the conveyed material, so compared to melt-connected molding of molded products using integral molding, inclusive molding, etc., it has the effect of requiring no effort at all. It is brought about.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of a conventional injection molding apparatus, Fig. 2 is a cross-sectional view of a model of the apparatus used in the injection molding method according to the present invention, and Figs. 7 is a cross-sectional view explaining each step of the injection molding method using the apparatus shown in FIG. 9 and 9 are cross-sectional views, respectively, showing examples of forming the connection portion in the injection molding method according to the present invention, and FIG. 10 and FIG.
Fig. 1 is a plan view showing another example of a structure in which a molded product is attached to a conveying material, and Fig. 12 is a plan view showing a different method of supplying a molded product formed in the injection molding method according to the present invention. . 3.4...Mold 5,29,31.36...Molded product 6...Molded product body? , 23, 27. 32... Connection part 14... Punch 15... Sprocket 17
゜24.30... Convex portion 18, 25, 29, 33, 3
5.37.40... Conveyed material 26... Hole 28...
・Concave Agent Patent Attorney Takehiko Matsumoto Figure 1 17 Figure 3 3 Figure 9 Figure 12 Bow [Masaa, Itorokutsu City] (Spontaneous) June 8, 1980 2, Name of the invention Injection molding Law 3, Relationship with the case of the person making the amendment Patent applicant Location 1048 Kadoma, Kadoma City, Osaka Prefecture Name (5)
83) Matsushita Electric Works Co., Ltd. Representative Iku Kobayashi 4, Agent name (7346) Patent attorney Takehiko Matsumoto 5, No number of inventions to be increased by amendment 6, Description subject to amendment 7, Amendment Contents (1) On page 9, line 17 of the specification, the phrase ``1 injection molding device'' is corrected to read ``injection molding device''.

Claims (2)

[Claims] (1) An injection molding method comprising a step of injection molding a molded article in a pair of molds, and a step of sending the molded article obtained by this step to another part of the mold, the method comprising: An injection molding method characterized in that the molded product is attached to a carrier material that transports the molded product from inside the mold to outside the mold. (2) The injection molding method according to claim 1, wherein the molded article is attached to the conveyed material by fitting the convex portion formed on the lower surface of the molded article into the hole of the conveyed material.