JPH0242335B2 - - Google Patents

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. In other words, a large number of molded products were supplied in separate pieces. Therefore, in post-processes such as assembly, parts feeders must be used for each molded product in order to align the molded products.
In addition, molded products with complex shapes cannot be placed on the parts feeder and must be handled manually, leading to an increase in costs.

When parts feeders are used for molded products and molded products are packed in bags,
The molded products may be deformed or damaged due to collision or rubbing between the molded products or between the molded products and the wall of the parts feeder.

When temporarily storing a large number of disjointed molded products, pallets and bags are required, so it is troublesome to store them in the pallets and bags and take out the molded products, and management is also difficult.

There were drawbacks such as:

Therefore, in order to solve this problem, as disclosed in Japanese Patent Application Laid-open No. 51-98763, etc., the molded product is molded in a pair of molds at the same time as a string, etc. A method has been developed that connects it to the conveyed material by integral molding. With this method, a large number of molded products are connected to the conveyed material in an aligned state, which facilitates handling in subsequent steps. However, the generation of defective products cannot be avoided during molding, and this method has the disadvantage that not only good products but also defective products are connected to the conveyed material, and once connected, defective products are removed from the molded product. Unless a part of the material is broken or the string used as the material is cut, it cannot be separated from the material being transported, so defective products also flow to the subsequent process. It was necessary to take care not to process it. Additionally, if a molded product is to be used in a subsequent process, it is necessary to separate the molded product from the transported material by folding or cutting a portion of the molded product or the boundary between the molded product and the transported material. , separation work of molded products is troublesome. Moreover, if the molded product is broken or cut off with excessive force, cracks or deformations occur at the separated portions, resulting in a decrease in the quality and strength of the molded product. Since unevenness and scratches remain on the fractured end face at the separated portion, it is time-consuming to perform finishing work on the end face to remove these unevenness and scratches.

[Purpose of the invention]

Therefore, the present invention makes use of the advantages of the above-mentioned method, does not cause such inconvenience, and makes it easy to handle the molded product when transporting it, storing it, or supplying it to subsequent processes after it has been sent out from the molding device. The purpose is to provide an injection molding method.

[Disclosure of the invention]

In order to achieve the above object, the present invention includes a step of injection molding a molded article within a pair of molds, a step of transferring the molded article obtained by this step to another part within the mold, The gist of this method is an injection molding method in which the molded product is coupled to a conveying material for conveying the molded product by a removable coupling means in the other portion of the mold.

Hereinafter, this will be explained in detail based on drawings showing examples thereof.

FIG. 2 shows an apparatus used in the injection molding method according to the invention. As shown in this figure, a mold section 9 in which a molded product 5 is molded is provided in the molds 3 and 4. The molded product 5 is a molded product main body 6
In addition to the above, there is also a transport coupling part 7 which is detachably connected to the transport material 18 in front of the mold part 9, and a transport pin 11 extending from a transport device 10 behind the mold part 9.
A pin fixing part 9 for fixing is integrally molded. 12 is a sprue, and 13 is an ejector pin for pushing up the molded product 5 from the mold portion 9. Between the molds 3 and 4 in front of the mold part 9, a spring 13 is attached downwardly above the joint part 7 of the molded product 5 and the conveying material 18 so that they can be removably connected. A biased punch 14 is provided. The bonding state between the bonding portion 7 of the molded product 5 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 15 that drives the conveyed material 18 and the gear 15, so that the molded product 5 is taken out from between the molds 3 and 4. A support roller 116 that rotatably presses and supports the molded products 5 is installed. Further in front of these gears 15 and support rollers 16, there is provided a take-up reel (not shown) for winding up the molded products 5 together with the conveyed material 18 as shown by chain lines.

As shown in FIG. 7, the conveyed material 18 has a pilot hole 19 for receiving the sprocket of the gear 15 shown in FIG.
Holes 23 for receiving the convex portions 17 formed on the lower surface of the joint portion 7 are provided at regular intervals in the traveling direction. The joint part 7 of the molded product 5 is connected to the conveyed material 1 by fitting the convex part 17 into the hole 23.
Combined with 8. That is, the fitting structure formed by the convex portion 17 and the hole 23 serves as a detachable coupling means for coupling the molded product 5 to the conveyed material 18. The molded product 5 combined with the carrier material 18 can be handled, transported, or stored as one unit with the carrier material 18. In addition, the joint part 7 of the molded product 5 and the conveying material 18
If the fitting with the hole 23 is released, the molded product 5 can be easily removed from 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, and a molded article 5 as shown in FIG. 3 is molded. The molded product 5, together with the molded product main body 6,
The connecting portion 7 to the conveyed material 18 and the pin fixing portion 8 are integrally molded. Further, at this time, the tip of the transfer pin 11 described above is embedded in the pin fixing portion 8 and is integrally molded at the same time. A convex portion 17 is formed on the lower surface of the joint portion 7. Simultaneously with the molding of the molded product 5, in front of the molded product 5, the already formed molded product 5 and the conveyed material 18 are joined together. That is, in other parts of the mold in front of the mold part 9, the joint part 7 of the molded product is joined to the conveyed material 18 in conjunction with the opening and closing operations of the molds 3 and 4. .

Next, as shown in FIG.
Extruded by 3. At this time, the pin fixing part 8 of the molded product is fixed to the transfer device 10 more than when molding the molded product.
The transfer pin 11 is in a fixed state. Therefore,
As shown in FIG. 5, when the transfer pin 11 is extended forward, the molded product 5 supported by the transfer pin 11 is transferred to another part of the molds 3 and 4 in front of the mold section 9. It will be done. At the same time, the molded products 5, 5 on the conveyed material 18 are moved by the gear 15 shown in FIG.
By engaging the pilot hole 8 (not shown) and moving the carrier material 18, one molded product is sent out toward the outside (front) of the mold. Note that the molded products 5 that are sent out may be sent to a subsequent process as they are, or may be wound up on a reel and provided for transportation or temporary storage. On the other hand, the molded product 5 sent to another part within the molds 3 and 4
As seen in FIG. 6, the molded product support block 21 is always urged upward by a spring 20 as the molds 3 and 4 begin to close. After that, when the extending transfer pin 11 retreats, the transfer pin 1 moves from the pin fixing part 11 of the molded product 5.
1 is pulled out, and the support of the molded product 5 by the transfer pin 11 is released.

After that, the molds 3 and 4 are made as shown in FIG.
When the molded product 5 is completely closed and pressed by the punch 18, the convex portion 17 on the molded product 5 side is fitted into the hole 17 on the conveyed material 18 side, and the joint portion 7 of the molded product 5 is conveyed. material 18. In this way, the molded product 5 is attached to the carrier material 18, and at the same time, a new molded product 5 is molded by injection molding of molten resin in the mold section 9.

Note that the molded product that is 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 that has an insert component.

In the embodiment, the transfer pin was designed to support the rear part of the molded product as a means for transferring the molded product 5 from the mold part 9 to the joining position to the conveying material 18, but the point where the molded product is supported by the transfer pin is It is not limited to the above 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 transfer pins (not shown). Further, the structure of the molded product supported by the transfer pin is not limited to the above-mentioned structure, and may be a pin hole-like structure.

In the above embodiment, the means for removably joining the molded product to the conveyed material was such that the joint portion of the molded product had a convex portion on its lower surface, and the conveyed material had a hole corresponding to the convex portion. . However, it is not limited to this. For example, as shown in FIG. 8a, a convex portion 24' on the lower surface of the joint portion 24 is bulged downward, and a concave portion 26 corresponding to the convex portion 24' is formed on the upper surface of the conveyed material 25. As shown in FIG. 8B, there is a structure in which a concave portion is formed in the joint portion 27 and a convex portion 30 is formed on the upper surface of the conveyed material 29.

In the example, a joint portion was formed for each molded unit. However, as shown in Figure 9, the molded product 31
For molded products that are molded in large numbers at once and have multiple cavities, such as those in which four molded products are molded at once and the joint 32 with the conveying material 33 is formed only in the middle part of the four-cavity molded product, The coupling portion may be formed only in a part.

Furthermore, the means for removably coupling the molded product to the carrier material is not limited to the above-mentioned fitting structure. For example, as shown in FIG. 10, there is a structure in which a molded product 36 is adhered onto a conveyor material 35 coated with an adhesive 34, and a recess 38 corresponding to the shape of the molded product 36 as shown in FIG. The structure may be such that the molded product 36 is fitted into the recess 38 of the conveying material 37 provided with the recess 38 . Therefore, in these embodiments, the lower surface or bottom shape of the molded article 36 itself serves as a connecting portion to be connected to the conveyed materials 35, 37.
Note that when using the adhesive 34, the molded product 36 can be removed from the conveying material 35 by peeling it off.
6 and the conveyed material 35 are released. Furthermore, as shown in FIG. 12, the molded product supply method includes providing a conveying member 40 for transporting the molded product 36 in a direction perpendicular to the direction in which the molded product 36 is sent from the transfer device 39. I don't mind.

〔Effect of the invention〕

As described above, in the injection molding method according to the present invention, after a molded product is injection molded in a pair of molds,
This is an injection molding method in which the molded product is moved to a part other than the molding position and is joined to the conveyed material using a removable joining means. The molded product is taken out from the mold while being bonded to a carrier material that is used to transport and store the molded product. In other words, in the conventional method, a large number of molded products are taken out in a separate state, whereas in the method of this invention, the molded products are taken out in a state in which they are arranged in an orderly manner on a conveying material and temporarily fixed. be.

As a result, in the post-process, there is no need to use a parts feeder or bag the molded product, so it is possible to suppress the cost increase that occurs during the post-process, and there is an effect that the molded product will not be deformed or damaged. be. Further, the molded product can be easily handled and managed.
Furthermore, it is also possible to determine whether the molded product is good or bad in the mold before joining the molded product to the conveyance material, and to avoid joining unnecessary molded products to the conveyance material.

In addition, the bond between the molded product and the conveyed material can be released without damaging the molded product or the conveyed material, so even if a defective molded product is once bonded to the conveyed material, when attempting to remove it, the molded product cannot be removed. It can be easily removed by simply uncoupling the conveyed material. As a result, compared to melt-connected molding of a molded product by integral molding or inclusion molding of the molded product and the conveying material, the process requires no effort at all.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a conventional injection molding device, FIG. 2 is a sectional view showing a model of the device used in the injection molding method according to the present invention, and FIGS. 3 to 6 are the same as those shown in FIG. 7 is a cross-sectional view explaining each step of the injection molding method using the apparatus; FIG. 7 is a partial plan view and partial side view showing an example of a molded product obtained by the apparatus of FIG. 2; FIG. 9th
10 and 11 are plan views showing another embodiment of the means for joining the molded product and the conveyed material, and FIG. FIG. 2 is a plan view showing a different method of supplying a molded article formed in the injection molding method according to the present invention. 3, 4... Mold, 5, 31, 36... Molded product,
6... Molded product body, 7, 24, 27, 32... Joint portion, 14... Punch, 15... Gear, 17, 2
4', 30... Convex portion, 18, 25, 29, 33,
35, 37, 40... Conveyed material, 23, 26...
Hole, 28... recess.

Claims (1)

[Claims] 1 A step of injection molding a molded product within a pair of molds, a step of transferring the molded product obtained by this step to another part within the mold, and a step of injection molding a molded product within a pair of molds. An injection molding method comprising the step of coupling the molded article to a conveying material for conveying the molded article by means of a removable coupling means in the other portion. 2. The injection molding method according to claim 1, wherein the molded product is removably connected to the carrier material by fitting the convex portion formed on the lower surface of the molded product into the hole of the carrier material.