JP2896885B2 - Hot runner type mold applying ultrasonic energy - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot runner with a built-in needle valve in a molding die apparatus which is absolutely indispensable in a so-called synthetic resin molding factory or the like engaged in molding. It is an exaggeration to say that the technical field of the invention in the industrial field covers all fields of synthetic resin molding factories nationwide in Japan since it is such a method mold. Nothing.

[0002]

2. Description of the Related Art In the general synthetic resin molding industry, various problems have been taken up as quite troublesome difficult problems for a long time, and technical studies and investigations have been attempted each time. In spite of the fact that it has been used today, there are still many difficult problems lurking, and the hot runner type mold with a built-in needle valve is the most rational and novelty. The invention is rich and practical. Conventionally, in the synthetic resin injection molding industry, generally, in a so-called needle valve built-in type hot runner system in which a plurality of cavities are provided and molded in large quantities, a cavity for a mold is used. It is clear that the so-called two major functions are provided, in which each piece of the molten resin near the gate, which passes through the plate, must be heated and the temperature must also be adjusted. Where it is. Needless to say, in a limited mold space called a hot runner type mold which has the two major functions described above, the work of assembling various elements and parts with high precision is extremely advanced. In addition to specialized expertise, it also requires a skilled carrier, and of course, the price of these elements and parts and the like, regardless of which one you take, allow for very expensive things, However, in this type of hot runner type mold with a built-in needle valve, there are still a number of troublesome problems that still hurt the head, even if the molding temperature condition adjustment 1 is simply taken up. Was there. Here, the problems based on the conventional technology are roughly picked up as follows. That is,. For each piece near the gate, an extremely complicated electrical circuit is required, and of course, each of these must be equipped with a temperature control device. In the case of a mold, it has to be made momentum and expensive. . Since each of the gates has a very small temperature control method, it is a matter of course that an electrical circuit of extremely low complexity is required. Therefore, a large number of lead wires and / or Depending on the wiring of cords, etc., not only safety in work, but also frequent disconnection accidents at the time of mold replacement or movement of molds, etc., etc.
There are serious problems in workability, productivity, etc. . In the temperature control for each unit, the initial temperature is set, but after a predetermined time, as a result of receiving the thermal interference from the vicinity of the gates located adjacent to each other, the temperature condition greatly increases from the initially set temperature condition. By the end
This can have a significant effect on the quality of the molded product being molded. . Further, each time the molding temperature condition is set, as described above,
In consideration of the influence of temperature interference from the vicinity of the gate positioned adjacent to each other, each molding temperature condition must be set for each, and as described above, abundant carriers and, in addition, A high level of technology based on outstanding inspiration is required. . Needless to say, since the molding temperature condition setting work of such a term itself requires an extremely long time due to the nature of the work,
This has a significant effect on the productivity in plastic molding operations. . As described in detail above, in the hot runner type mold with a built-in needle valve, which is based on the conventional technology, the basic idea is "each individual gate". Because each heater temperature control method ", naturally, it must be equipped with an expensive and bulky temperature control device, and therefore, it is necessary to secure a large work space, etc. On the other hand, there are problems based on the conventional technology, such as disconnection accidents and failure problems, troublesome work problems, safety and work environment problems, etc., associated with the routing of lead wires and cords over a large number of lines. To name a few, there was no time to spare.

[0003]

The hot runner type mold of the conventional type has a number of problems as described above. The present invention has been made in view of the above points, and as a problem to be solved by the present invention, "a kind of hot runner type mold", or more specifically, "built-in needle valve""Hot runner type mold of mold" When thinking about it from the origin, here is a hint to try to clarify. That is, the present invention, in such a "hot runner type mold with a built-in needle valve",
Preceding paragraph

[0002]

2. Description of the Related Art In the section of the prior art, as will be described in detail, electric heat energy (in other words, electric energy is converted into heat energy) is used as a heat source for heating the tip of the needle valve itself. As long as we rely on the conversion, we can call it Joule's heat). They tried to convert. In other words, the starting point of the change of idea is that "electrical heat energy sources must never be used." This is because of the strong promotion of the change of idea. The many difficult problems and issues described above have all been completely cleared.

[0004]

SUMMARY OF THE INVENTION The present invention has not been fundamentally solved, not to mention theoretically, but most rationally, in light of the details set forth in the sections above. It is a proposal. If so, at this stage, in order to make the most ideal and perfect "hot runner type mold" appear, what kind of problems must be cleared in the current situation We started from the starting point and picked up a solution to the problem based on the answer. . First of all, no electrical heater circuit is used. . Thus, an equivalent heat energy corresponding to the heating value of the heater is generated by a completely different system. . If so, how to make the equivalent thermal energy work without using any electrical circuit.
.., But as a result of proceeding with such an idea, the following items were obtained.
That is,. In order to generate heat without using electricity, the local portion (in the present invention, indicating a tip needle portion in a needle valve) is vigorously rubbed. . Excessive physical rubs can cause exothermic phenomena. . . Thus, in order to rub violently, a vibrating phenomenon may be applied to the local part. . Speaking of violent vibration phenomena, that is, the application of ultrasonic energy. The means for solving the problem has been through the steps as described, and has now come to the appearance of a hot runner type mold to which ultrasonic energy is applied. Today, ultrasonic energy is commonly referred to as ultrasonic machining and is widely used to cut, grind, wrap, weld, weld, braze,
Electrolysis, electroforming, plating, discharging, washing, etc., etc., besides, the application field is extremely wide and fortunately, fortunately, the instantaneous of the very small part such as the needle at the tip of the needle valve For heating, it can be described as a bitter lifting device. Therefore, in order to heat the ultrasonic energy most effectively and in a form limited to only the needle portion at the tip of the needle valve, the base of the upper end of the needle valve is fixed to the ultrasonic transducer, and From the base part, the exponential (forming an exponential curve) was gradually reduced in cross-sectional area, and a needle was formed at the tip part to form an exponential type nozzle horn, which was mounted on the gate. According to the present invention, the entire energy of the ultrasonic wave is made to converge on the needle portion, thereby increasing the amplitude, ie, increasing the instantaneous heating effect. As described above, it has become clear that various difficulties related to the hot runner type mold can be solved all at once by referring to the items to be described in detail.
Therefore, the specific means regarding the terms (1) to (6) are as follows. A fixed half block (F, H, B) formed by combining a top base plate (T), a manifold block (M, B), a manifold (M, H), and a plate (P); Moving side cavity plate (M,
C, P), a hot runner mold device (H,
R, S) for the molten resin (L) that can communicate with each of a plurality of cavities (C)... Drilled at appropriate locations on the moving side cavity plate (M, C, P). The upper end base is integrally fixed to the ultrasonic vibrators (U, B) with respect to the temperature control in the vicinity (K) of the gates (G). Needle valves (N) are formed at the front end so as to reduce the cross-sectional area and maintain an appropriate positional relationship corresponding to each of the gates (G). Hot runner type molds (H, R, R) to which ultrasonic energy is applied where exponential type nozzle horns (E, N, H) are attached to each gate (G). C), many difficult problems already detailed All of them have been cleared at once, and the structure is simple, so the number of components is small and easy to manufacture, so the price is low, low, and low. , To enable the use of existing existing injection molding machines, and even when setting temperature conditions,
There is no need for a high level of technical skill or intuition, and so on.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The "hot runner type mold applying ultrasonic energy" according to the present invention is described in the preceding section.

[0004]

In the present invention, it is possible to make use of a construction mechanism as described in detail.
If the present invention "hot runner type mold applying ultrasonic energy" is mounted on an existing injection molding machine, etc., all the conventional problems can be cleared all at once. It's no longer a doubt. As described above, what can be definitely asserted is that the energy of the ultrasonic wave, which is completely unrelated to the electric heat energy, is adopted. That is, while the basic in the conventional technology is “Joule heat”, the technical basic base according to the present invention is a physical “ultrasonic wave”. In addition, if it is expressed simply, it can be regarded as "a kind of vibration phenomenon". Now, the embodiment of the present invention will be described as follows. That is, the base of the conventional needle valve (which is generally equivalent to the upper shank portion), which is disposed and mounted at an appropriate position in the runner of a general hot runner type mold, is superposed. At the same time, the cross-sectional area is gradually reduced exponentially from the base of the needle valve, and the tip is formed into a needle. The invention provides an exponential nozzle horn. Therefore, if an ultrasonic oscillator element is electrically connected to the ultrasonic transducer to be described and a low-voltage DC power supply is connected and applied to a power supply terminal of the element, all of the elements are obtained. Is completed, and here, in setting the most important molding temperature condition, from the transmitted ultrasonic oscillator element,
The ultrasonic frequency can be finely adjusted very easily by turning the knob, which is installed on an operation panel or the like. Thus, all the troublesome headaches to date have been solved all at once, and the molding temperature condition set value is stable in a more accurate temperature range, and its It is the result of sustainability.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
And FIG. First, in FIG. 1 of this embodiment, a general hot runner system, that is, a top base plate (T), a manifold block (M,
B), fixed half block (F, H, B) formed by combining manifold (M, H) and plate (P)
On the other hand, a so-called hot runner mold device (H, R, S) comprising a movable cavity plate (M, C, P) in which a plurality of cavities (C) are formed. , A part of which is partially cut away, showing a cross-sectional front view of the main part, and each of the plurality of cavities (C).
Regarding temperature control in the vicinity (K) of the gates (G) for the molten resin (L) which can communicate with each other, the upper end base (F) is integrally fixed to the ultrasonic transducers (U, B). At the same time as the base (F), the cross-sectional area of which is reduced exponentially (forming an exponential curve), and the front end corresponds to each of the gates (G). Exponential type nozzle horns (E, N, H), which are formed by molding the needle valves (N) so as to maintain an appropriate positional relationship, face each of the gates (G). It is characterized by being attached by
In the hot runner type mold (H, R, C) to which ultrasonic energy is applied, (W) ... in the figure is a molten resin runner, (H) ... is a pipe heater for a manifold,
(B)... Represent bushings, and (S, P)... Represent spacer blocks. FIG. 2 shows the exponential type nozzle horn (E,
3A and 3B show a front view of an essential part of a partially omitted notch showing a main part of the present invention, and FIG. 3 shows an exponential nozzle horn (E, N, H) according to the present invention. And the layout of the ultrasonic vibrating stems (U, B) and the ultrasonic oscillators (U, T) in the form of an embodiment diagram, and FIG. (M) shows the plus terminal of the DC power supply, and (M) shows the minus terminal.

[0007]

As described above, according to the present invention, the following practical effects are provided. First of all,
The present invention "a hot runner type mold applying ultrasonic energy" is a so-called synthetic resin molding factory and the like which is engaged in molding processing, which is an absolutely indispensable mold molding apparatus. In the hot runner type mold with a built-in needle valve, there is a ripple effect produced by the present invention, and in general, there is an enormous amount that cannot be measured. Concerning the characteristic effects, the fundamental difference from the configuration of the present invention with respect to the conventionally known configuration is as follows. That is, in the conventionally known product, the needle portion of the needle valve is As a heating source, electric heat energy, in other words, Joule heat was used, whereas that of the present invention is an ultrasonic energy fundamentally different from Joule heat, in other words, an ultrasonic wave. To the point using vibration Thus, the adoption of such a heat source based on the ultrasonic vibration has brought about various characteristic effects as described below.
That is,. There is no need for an electric heater around the needle part of the needle valve. . Temperature sensors are not required at all. . Depending on the terms and the terms, the accuracy of such assembling into the mold is greatly relaxed. . The volume or space around the cavity is minimal. . Dramatic reduction in the man-hour for assembling the mold is possible. . There is no need to route complicated leads and cords around the mold. . According to the above items (1) to (4), the elements and parts relating to the above are not required, so that the cost can be greatly reduced in terms of equipment cost. . The setting operation of the molding temperature condition becomes extremely easy. . Therefore, a work can be performed by a less experienced person instead of a conventional skilled person. ▲ 10 ▼. Of course, since the area around the mold is refreshed, it is possible to promote a powerful environment improvement as an ideal workplace for organizing workplaces, for safety measures, etc. It is clear that it has a great effect on the improvement of As can be mentioned, the present invention is based on
Its configuration is simpler than conventional known products, so it is easy to manufacture,
The mechanism is more compact, space-saving, energy-saving, and so on.
Its practical effect is enormous, and the contribution of this species to the industry is immeasurable.

[Brief description of the drawings]

FIG. 1 shows one embodiment of the present invention, in which FIG.
In a general hot runner mold apparatus, the ultrasonic energy of the present invention is applied, and when an exponential type nozzle horn is mounted, a partially omitted partial cutaway main part cross-sectional front view is shown. The ultrasonic oscillator element and the like connected to the transducer for use are omitted.

FIG. 2 is a cross-sectional front view of a main part of the exponential nozzle horn shown in FIG.

FIG. 3 is a diagram showing the relationship between an exponential nozzle horn, an ultrasonic vibration system, an ultrasonic vibrator, and an ultrasonic oscillator according to the present invention. Accordingly, the ultrasonic oscillator is represented by a two-dot chain line.

[Explanation of symbols]

A Positive terminal of low voltage DC power supply B ... Bushing C ... Cavity E, N, H Exponential nozzle horn F Top base F, H, B Fixed half block G ... Gate H ... Pipe heater for manifold H, R, C Hot runner type mold applying ultrasonic energy H, R, S Hot runner mold device L Molten resin K ... Nearby M Negative terminal of low voltage DC power supply M, B Manifold block M, C, P Moving cavity Plate M, H Manifold N ... Needle valve P Plate S, P Spacer block T Top base plate U, B Ultrasonic vibrator U, T Ultrasonic oscillator W Molten resin runner

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B29C 45/26-45/44 B29C 45/73

Claims (1)

(57) [Claims] 1. A fixed half block (F, H, B) formed by connecting a top base plate (T), a manifold block (M, B), a manifold (M, H), a plate (P), and the like. , A moving side cavity plate (M,
C, P), a hot runner mold device (H,
R, S) for the molten resin (L) that can communicate with each of a plurality of cavities (C)... Drilled at appropriate locations on the moving side cavity plate (M, C, P). The upper end base is integrally fixed to the ultrasonic vibrators (U, B) with respect to the temperature control in the vicinity (K) of the gates (G). Needle valves (N) are formed at the front end so as to reduce the cross-sectional area and maintain an appropriate positional relationship corresponding to each of the gates (G). Hot runner type molds (H, R, C) that apply ultrasonic energy, characterized in that the exponential type nozzle horns (E, N, H) are mounted facing each gate. ).