JPH0261889B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is directed to an adhesive container 21 as shown in the second figure.
Attached to the discharge port 22 etc. of the nozzle tip 20a
A capillary nozzle 20 that can apply a small amount of it to the details of assembled parts etc.
The present invention mainly relates to an integral injection molding method using plastic.

Conventional technology Conventionally, for a capillary nozzle, a hollow body was first formed using a thin straw-like tube, and then the nozzle portion was integrally formed by stretching the hollow body while heating it.

Problems to be Solved by the Invention Conventional capillary nozzles, which process thin tubes by stretching them while heating them, not only have poor productivity, but also have irregular shapes, making it impossible to obtain products with a constant inner diameter, and problems with variations. The main problem was that it lacked stability during use.

Furthermore, even if one attempts to integrally mold this with plastic, as shown in Figure 4, the thin core 23 provided at the tip of the thick core is usually bent by the resin pressure during injection, making molding difficult. It was hot.

In addition, as described in Japanese Patent Application Laid-open No. 53-1984,
In the case of a configuration in which a thin core integrally provided at the tip of a thick core is unilaterally clamped as the mold is clamped and resists the tensile resin pressure, equal clamping force and tensile force cannot be obtained, resulting in a strong If it is too thin, the thin core may be deformed or torn, and if the core is held between elastic members such as heat-resistant rubber, it may not be possible to obtain a sufficiently strong tensile force. In addition to the problems of difficulty and lack of durability, the capillary nozzle is taken out from the outside core while being in close contact with the outer periphery of the inside core after injection molding. However, it was difficult to remove the elongated, tube-shaped, weak nozzle portion with no draft from the inside core at the same time as the thick hollow body portion.

Means for Solving the Problems Therefore, the present invention has been developed to provide an inside capillary nozzle with fine holes as shown in principle in FIG. The core 1 is inserted into the outside core 5 to form an injection space corresponding to the hollow body of the capillary nozzle, and the outside core 5 molds the nozzle part of the capillary nozzle.
A pin 8 penetrating through the inside core is inserted, and the pin 8 is elastically pulled to apply tension to form an injection space 9 in the mold, injection molding is performed, and the pin is removed after cooling. The present invention provides an integral injection molding method for a capillary nozzle, which consists of pulling out a capillary nozzle, and more specifically, a method for molding a capillary nozzle, which integrally has a hollow body part and a nozzle part having a fine nozzle hole, is A method of integrally injection molding a core and an outside core, wherein the outside core has a hollow body, a nozzle, and a fine hole provided in the direction of the tip of the nozzle, and a hole corresponding to the hollow body is placed inside the outside core. means for forming an injection space in a hollow body of a capillary nozzle by inserting an inside core having an external shape and passing through a fine hole in the center; A retractably inserted pin is introduced from inside the fine hole through the nozzle portion of the outside core, through the fine hole at the tip thereof, to the outside of the outside core, and the tip of the pin is gripped by a gripping member. , the rear end of the pin is elastically pulled by a telescopic actuating member on the insertion side of the inside core, and an injection space for the nozzle portion of the capillary nozzle is integrally formed with the injection space of the hollow body within the outside core. and a means for injecting resin into the injection space, and after cooling the resin, releasing the grip on the tip of the pin and retracting the pin into the microhole of the inside core to form a nozzle part of the capillary nozzle. means for separating the inside core with a capillary nozzle integrally having a nozzle portion on the outer periphery of the outside core; and means for removing the hollow body of the capillary nozzle integrally with the nozzle portion from the outer periphery of the inside core. The present invention provides a method for integral injection molding of a capillary nozzle comprising:

Function: Injection molding is performed by applying elastic tension to the pin that passes through the microhole in the inside core and the capillary nozzle part in the outside core, so the pin will not bend due to resin pressure during injection. , and the pins will not break off,
After cooling, if the pin is pulled out, a nozzle part of a capillary nozzle with a constant inner diameter can be easily formed along the pin diameter, and then a capillary nozzle having a nozzle part integrated from the outside core to the outer periphery can be formed. To provide a method for integral injection molding of a capillary nozzle, in which the inside core can be smoothly separated with the help of the inside core, and the hollow body of the capillary nozzle can be easily removed integrally with the nozzle part from the outer periphery of the inside core. There is.

Embodiment In FIG. 1, reference numeral 1 denotes an inside core having a fine hole 2 at its center, which is integrally fixed to a movable formwork 3. 4 is a mold clamping shaft of the movable formwork 3;
is provided so that it can be moved forward and backward relative to the formwork 6 that forms the outside core 5. 7 is an elastic telescoping member such as an air cylinder, and the movable formwork 3
A pin 8 with a diameter of 0.4 mm provided at the tip of the pin 8 is configured to be able to move forward and backward. The inside core 1 is configured to fit into the center of the outside core 5 at a position where the movable formwork 3 comes into close contact with the mating formwork 6, and to form an injection space 9 for the capillary nozzle around it. It has been done. Reference numeral 10 denotes a nozzle portion with a diameter of 1 mm of the capillary nozzle in the injection space, and the pin 8 passing through the fine hole 2 of the inside core 1 passes through the center thereof, and further passes through the fine hole 11 at the tip of the nozzle portion 10. , so that it can be positioned at the gripping position of the gripping member 13 of the fixed formwork 12. In the case of the embodiment, the movable formwork 3 presses the formwork 6 against the fixed formwork 12 and closes the mold under high pressure, and at the same time, the gripping member 13 holds the tip of the pin 8. There is. 14 is an injection path provided in the formwork 6, and the injection path 15 of the fixed formwork 12 is formed by high-pressure mold clamping.
It is configured to communicate with

In the above configuration, first, at the start of initial mold clamping, the movable formwork 3 and the telescopic actuating member 7 are retracted, the inside core 1 is located outside the outside core 5, and the pin 8 is located outside the inside core. 1 and retreated into the micropores 2 of 1. When the mold clamping shaft 4 advances due to initial mold clamping, the inside core 1 advances to the center of the outside core 5, and the initial mold clamping is completed at the position where the movable mold frame 3 shown in the first diagram comes into contact with the mold frame 6, The injection space of the hollow body of the capillary nozzle is formed within the outside core 5. Here, the telescopic actuating member 7 advances, and the pin 8 at its tip passes from the tip of the inside core 1 to the nozzle portion 10 of the outside core 5, passes through the fine hole 11, and reaches the gripping position of the gripping member 13 of the fixed formwork 12. protrudes until. When the pin 8 finishes advancing, the telescopic operating member 7 such as an air cylinder stops, the mold clamping shaft 4 advances further, the mold 6 is crimped against the fixed mold 12, high-pressure mold clamping is performed, and at the same time the gripping The member 13 grips the tip of the pin 8 in the gripping position. Here, the telescopic actuating member 7 operates in the backward direction, applying elastic tension to the pin 8, and at the same time
Injection is performed from the injection paths 14 and 15 into the injection space 9 of the capillary nozzle, and immediately after the injection, the movement of the telescopic actuating member 7 in the backward direction is stopped. When the cooling in the injection space 9 is completed, the mold clamping shaft 4 retreats to the state shown in the figure for initial mold opening, the gripping member 13 releases the pin 8, and the telescopic actuating member 7 gradually retreats to release the pin 8. The inside core 1 is evacuated to the inside of the fine hole 2.

At this time, nozzle part 1 of the capillary nozzle
0, a nozzle hole is formed by the pin 8, and the substantial molding of the nozzle portion of the capillary nozzle is completed. Next, the mold clamping shaft 4 retreats to open the mold again, and the inside core 1 is separated from the outside core 5 with the capillary nozzle on its outer periphery, and the inside core 1 is moved against the movable mold 3 by hydraulic means (not shown). Due to the backward movement or the like, the product of the capillary nozzle comes off the inside core 1 and falls to a predetermined location.

Effects As described above, according to the method for integral injection molding of a capillary nozzle according to the present invention, a capillary nozzle that integrally has a hollow body part and a nozzle part having a fine nozzle hole is molded into an inside core and an outside core. A method of integral injection molding, in which an outside core having the hollow body part, a nozzle part, and a fine hole provided in the direction of the tip of the nozzle part,
means for forming an injection space of the hollow body of a capillary nozzle by inserting an inside core having an external shape corresponding to the hollow body and having a fine hole penetrated through the center; A pin that is retractably inserted into a microscopic hole is introduced from the microscopic hole through the nozzle portion of the outside core, and is introduced from the microscopic hole at its tip to the gripping member of the outside core, and the tip of the pin is grasped. While gripping the pin with a member, the rear end of the pin is elastically pulled by a telescoping member on the insertion side of the inside core, and the injection space of the nozzle part of the capillary nozzle is formed in the outside core by the injection space of the hollow body part. Since the injection space of the nozzle portion of the capillary nozzle is formed integrally with the space, the injection space of the nozzle portion of the capillary nozzle can be created by elastically pulling a pin that passes through the microhole of the inside core through the inside of the outside core. In addition to being easy to construct, products with a constant inner diameter and wall thickness can be easily molded without being deformed by resin pressure during injection molding, and pins can be easily replaced. By changing the diameter, capillary nozzles with various nozzle inner diameters can be easily molded.Furthermore, resin is injected into the injection space, and after the resin has cooled, the grip on the tip of the pin is released and the pin is removed. means for forming a nozzle part of a capillary nozzle by retracting the inside core into a fine hole of the inside core; The nozzle of the capillary nozzle can be safely removed by simply pulling out the pin without moving the inside core within the outside core, since the hollow body of the capillary nozzle can be removed from the outer periphery of the core together with the nozzle part. Once the die-cutting work of the part has been substantially completed, the capillary nozzle product can be made by simply pulling out the inside core along with the outer periphery of the capillary nozzle from the outside core and removing the hollow body from the inside core. This eliminates the difficult task of removing the nozzle part, which is elongated, tube-shaped, weak, and has no draft, from the inside core at the same time as the thick hollow body. be.

[Brief explanation of drawings]

FIG. 1 is a schematic vertical cross-sectional view of essential parts showing an outline of an apparatus for carrying out the method of the present invention, FIG. 2 is a schematic explanatory view showing how an embodiment of the capillary nozzle according to the present invention is used, and FIG. 4 is an explanatory diagram showing the principle of an embodiment of the method of the present invention, and FIG. 4 is an explanatory diagram for explaining the problems of the prior art. 1... Inside core, 2... Fine pore, 3...
Movable formwork, 5...Outside core, 6...Formwork, 7...Telescopic operating member, 8...Pin, 9...Injection space, 10...Nozzle portion of capillary nozzle, 12...Fixed type Frame, 13... Gripping member, 1
4,15...Ejection path.

Claims (1)

[Claims] 1. A method of integrally injection molding a capillary nozzle that integrally has a hollow body part and a nozzle part having a fine nozzle hole with an inside core and an outside core, the method comprising integrally injection molding the hollow body part, the nozzle part, and the nozzle part. An inside core having an outer shape corresponding to the hollow body and having a fine hole extending through the center is inserted into an outside core having a fine hole provided in the direction of the tip of the capillary nozzle. means for forming an injection space; a pin retractably inserted into the microhole of the inside core from the insertion side of the inside core; is introduced to the gripping member of the outside core through the pin, and the tip of the pin is gripped by the gripping member,
The rear end of the pin is elastically pulled on the insertion side of the inside core by a telescopic actuating member, and an injection space for the nozzle portion of the capillary nozzle is formed in the outside core integrally with the injection space of the hollow body. means and
means for injecting resin into the injection space, releasing the grip on the tip of the pin after the resin has cooled, and retracting the pin into the microhole of the inside core to form a nozzle portion of the capillary nozzle; A capillary nozzle comprising means for separating the inside core from the core with a capillary nozzle integrally having a nozzle part on the outer periphery, and means for removing the hollow body of the capillary nozzle integrally with the nozzle part from the outer periphery of the inside core. One-piece injection molding method.