JPH02173B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an injection mold.

Products such as synthetic resin pipes, gutters, and their joints have a sealing material at the connection end and are joined without using adhesives, but conventionally, pipes,
The main body of the gutter, joint, etc. and the sealing material are manufactured separately, and the sealing material is inserted manually or mechanically into the main body, which results in poor manufacturing efficiency, which increases manufacturing costs and storage management costs. However, there was a problem in that the cost of the product was high due to the high transportation costs.

The present invention has been made in view of the above-mentioned conventional problems, and includes a movable mold that forms a molding cavity for the product body between a fixed mold plate, a slide core, and a movable mold that is moved when the slide core is retracted. A plurality of driven cores are provided, and these cores are slidably fitted so that their opposing end surfaces can be separated in sequence, and a separation distance regulating means is provided, and a means for applying a separation force to the cores that is compressed and expanded by the movement of the sliding core when the sliding core moves back and forth. A spring is provided, and the core forms a product connection molding cavity at the slide core's entry stop position, and at the retracted position of the slide core, the cores are separated from each other by a predetermined distance by the elasticity of the spring, so that the cores are spaced apart from each other by a predetermined distance. By forming a sealing body molding cavity, forming a sealing material injection part in addition to the resin injection part, and providing a needle valve body to open and close the injection part, it is possible to integrate the sealing material into the product in the mold. An object of the present invention is to provide an injection molding mold that can be molded, shorten the manufacturing process of a product with a sealing material, increase manufacturing efficiency, and lower the cost of the product compared to the conventional method.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, reference numeral 1 denotes an injection molding mold for a gutter joint, and since it is symmetrical, one half of the mold is shown in a closed state. Reference numeral 10 denotes a fixed side template, which includes a resin injection part 11 for injecting molten resin, a sealing material injection part 12, a sealing material press-in passage 13 that crosses and communicates with the sealing material injection part 12, and a needle valve body. 1
It has 4. The needle valve body 14 is housed in the sealing material injection part 12 and receives elasticity from the spring 15, and is inserted into and removed from the injection port of the sealing material injection part 12 to open and close the injection port. The spring 15 is interposed in a hole 16 provided in communication with the sealant injection part 12, and imparts elasticity to the base 14a of the needle valve body 14 that tightly blocks the gap between the hole and the sealant injection part 12. . 2
0 is a movable mold plate, and its molding surface is used for molding the main body part A of the product (gutter joint) partially shown in FIG. 4 between the molding surface of the fixed mold plate. A cavity 21 is formed. 22 is a mold receiving plate. 31 is the core body of the slide core 30, 40
50 is a first driven core, and 50 is a second driven core, each of which has a molding surface, and these molding surfaces cooperate to form a product between the molding surface of the stationary template 10. A connecting portion molding cavity 35 is formed to mold the connecting portion B of. A sealing material passage molded part 32 that protrudes in a band shape and extends in the circumferential direction is formed on the molded surface of the core body 31, and the molded part 32 and the molded surface portion of the fixed side mold plate 10 corresponding to the molded part 32 are formed. This means that the connecting portion forming cavity 35 is provided with a sealing material passage forming cavity portion 35a for forming a shallow sealing material groove C of the product. Sealing material injection part 1
The injection port No. 2 opens into the sealing material passage forming cavity portion 35a, and when the injection port is closed, the tip of the needle valve body 14 is pressed against the sealing material passage forming portion 32. The first driven core 40 has fitting convex steps 4 on both sides.
1, 41, one of the convex steps 41 is the core body 3
The second driven core 50 is slidably fitted into a concave step formed on the opposing end surface of the second driven core 50 , and the other convex step is connected to the second driven core 50 .
It is slidably fitted into a recessed step formed on the opposing end surface. Reference numerals 60 and 61 indicate pins serving as separation distance regulating means, and the pin 60 loosely passes through the first driven core 40 and is screwed into the abutting end surface of the core body 31. The distance between the driven core 40 and the core body 31 is regulated to a predetermined distance L smaller than the step height of the convex step portion 41. The second driven core 50 is formed with a hole 51 into which the head can be inserted and removed. The pin 61 loosely passes through the second driven core 50 and is screwed into the opposing end surface of the first driven core 50, and its head part separates the second driven core 50 from the first driven core 40. The distance is regulated to a predetermined distance L smaller than the step height of the convex step portion 41. A hole 20a is formed in the end surface of the movable template 20, into which the head of the pin 61 can be inserted and removed. Reference numeral 62 is a spring (rubber elastic body) that applies a force for separating the cores from each other, and the spring 62 connects the core body 31 and the second driven core 5 through the first driven core 40.
0, and the spring 62 imparts elasticity to the second driven core 50 in a direction opposite to the core body 31. In the illustrated closed state, the slide core 3
0 is pressed against the elasticity of the spring 62 against the side of the movable mold plate 20. 70 is a protruding pin.

Next, the operation of this molding die will be explained.

In molding the product S shown in Figure 4,
The mold is closed as shown in FIG. 1, and molten resin is injected from the resin injection port 11. At this time, the needle valve body 14 is pressed down by the spring 15 to close the injection port of the sealant injection part 12 and is in pressure contact with the sealant passage forming part 32 of the core body 31.

After the above-mentioned injection injection, when a predetermined period of time (the time required for the injection-injected molten resin to solidify) has elapsed, the movable side mold plate 20 etc. move back a little and the mold opens slightly, and the slide core 30 moves to the second It is driven to retreat in the direction of the arrow shown in the figure to the position shown in the figure. When the slide core 30 retreats, the first driven core 40 follows this through the pin 60, the second driven core 50 follows the first driven core through the pin 61, and the slide core 30 When the illustrated retracted position is reached, the first driven core 40 is in a position facing the sealing material passage (sealing material groove) C formed by the core body 31. Furthermore, when the retracting movement of the slide core 30 begins, the spring 62 is decompressed and expanded, so when the slide core 30 reaches the retracted position, the first driven core 40
Sealing material molding cavities 34 and 45 having a width L are formed between the first and second driven cores 50.

When the slide core 30 is driven to the retracted position, the movable mold plate 20 and the like move forward as shown in FIG. 3 to close the mold. This time, the sealant is injected into the sealant press-fitting portion 12 through the sealant press-fitting passage 13 . The injected sealant pushes up the needle valve body 14 against the elasticity of the spring 15 to open the injection port of the sealant injection part 12, and the tip of the needle valve body 14 passes through the hole d formed in the product. The sealing material passage C is press-fitted, and the two sealing body molding cavity parts 34 and 45 are filled from the sealing material passageway. After press-fitting the sealing material, when the time required for the sealing material to solidify and become the sealing body D has elapsed,
The mold is opened and the product shown in FIG. 4, in which the sealing body D is integrally molded, is taken out.

Although the above embodiment is a case of a gutter joint, the present invention is not limited thereto, and can be applied to the molding of products such as pipes and gutter having a sealing body on the end side.

As described above, according to the present invention, a cavity is formed in cooperation with the slide core to form the product connection part between the fixed mold and the product connection part is formed by the slide core at a predetermined position after being driven. By providing a plurality of driven cores that form a sealing material molding cavity communicating with a sealing material passage, and by configuring a structure in which molding of a product and molding of a seal body are performed continuously in one mold, Compared to conventional methods, it is possible to reduce manufacturing costs by reducing the number of man-hours and time required to manufacture products with sealants, and there is no need to store products and sealants separately as in the past. Therefore, costs for storage management and transportation can be eliminated, and product costs can be significantly reduced.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of a half part of the embodiment of the present invention in the mold closed state, Fig. 2 is a transverse cross-sectional view of a half part of the slide core of the above embodiment when the slide core is retracted, and Fig. 3 is a seal of the above embodiment. FIG. 4 is a cross-sectional view of a half part of the product molded according to the above embodiment in a released state. 10...Fixed side template, 11...Resin injection part, 1
2... Sealing material injection part, 14... Needle valve body,
15... Spring, 20... Movable side template, 30... Slide core, 31... Core body, 32... Sealing material passage forming part, 40... First driven core, 41...
... Fitting convex step portion, 50 ... Second driven core, 60,
61...Pin serving as distance regulating means, 62...
A spring for applying force to separate the cores from each other.

Claims (1)

[Claims] 1. A fixed side mold plate, a movable mold that forms a molding cavity for the main body of a tube or semi-cylindrical product between the fixed side mold plate, and a movable mold that forms a molding cavity for the connection part of the product between the fixed side mold plate and the fixed side mold plate. It has a slide core and a plurality of driven cores connected through a separation distance regulating means formed by moving, and the driven core is slidably fitted to the slide core and other driven cores so that their mutually facing surfaces can be separated. A spring that applies a force for separating the cores from each other is engaged with the driven core and is compressed and expanded as the sliding core moves back and forth, and when the sliding core moves back and forth, the driven core follows this and at the same time the spring is decompressed. A sealing material molded cavity portion communicating with the space of the sealing material passage is formed between the mutual driven cores and between the driven core and the sliding core, and a sealing material injection needle valve body that can communicate with the molded cavity portion is provided. An injection mold that is characterized by: