JP2000271971A - Sprueless miniature runner type mold applying ultrasonic energy - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve the reduction of equipment cost, the enhancement of the quality and productivity of a product, the saving of a space, the enhancement of safety, the beautification of work environment by the fundamental improvement of various problems related to the heating source in the vicinity of a needle valve in a hot runner type injection mold and the rationalization of molding work, the reduction of the loss of a resin raw material, the preparation of the periphery of a mold apparatus or the like. SOLUTION: In a hot runner type injection mold, a plurality of the cavities (C)... provided to movable side cavity plates (M, C, P) and the nozzle gates (N, G)... bored in the bushing (B) fixed to the plate (P) are allowed to communicate with each other and the temp. of the nozzle horn elements (N, H, E) provided to the nozzle gates (N, G)... in an orthogonally opposed contact state and leading end needle parts (S, N) are solved by the application of an ultrasonic energy source.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding die apparatus, which is an indispensable molding apparatus for molding and processing, which is a so-called general synthetic resin molding factory. Because of the mini-runner type mold, it can be said that the technical field of the invention in industry covers all fields of synthetic resin molding factories all over Japan. But there is no exaggeration.

[0002]

2. Description of the Related Art Now, the present invention has been a very difficult problem in the general synthetic resin molding industry for a long time.
Occasionally taken up, each time, technical examinations and surveys ...
At present, various difficult problems are still lurking, and this is a mini-runner type mold with a built-in needle valve. In addition, it can be said that it is a proposal of the invention which is rich in novelty and excellent in practicality. Conventionally, in the synthetic resin injection molding industry,
Generally, in a so-called mini-runner system with a built-in needle valve, in which a plurality of cavities are installed and molded in a large amount, a portion near a gate of a molten resin, which passes through a cavity plate for a mold, is provided. It is well known that each of the individual units is provided with so-called two major functions, in which heating and fine temperature control must be performed for each individual unit. Of course, in the inevitably limited mold space, such as a mini-runner type mold, which has the two major functions described above, various elements and parts are arranged under high precision. Incorporation work requires extremely skilled professionals, as well as a skilled carrier, and, of course, the price of these elements and parts and the cost of any of them are extremely high. Forgive, for this kind of mini-runner type mold with a built-in needle valve, even if just taking up one adjustment function on the molding temperature condition, it is still a lot of headaches There was a troublesome problem. Here, the problems based on the conventional technology are picked up as follows.
That is,. For each individual near the gate, an extremely complicated electric circuit is required, and of course, each of these must be equipped with a temperature control device. In the case of a system mold, even if it is unpleasant, it must be 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 individual, the initial temperature is set, but after a predetermined time has elapsed, as a result of being subjected to thermal interference from the vicinity of the gate located adjacent to each other,
The temperature condition set at the beginning is greatly reduced, and may eventually have a serious influence on the quality of the molded product to be 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 located adjacent to each other, each molding temperature condition must be set for each, and as described above, abundant carriers and additional Demands for a high level of technology based on outstanding inspiration. . 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,
It can also have a significant effect on productivity in synthetic resin molding operations. . Therefore, on the mini-runner type mold, the sprue (referred to as a so-called spinous projection) is inevitably molded integrally with the hardened part of the runner.
There were many non-negligible losses such as heat energy loss, resin raw material loss, molding work cycle loss, and secondary work loss caused by the bulkiness of the runner. . As described in detail above, in the mini-runner type mold with built-in needle valve, which has the conventional technology, until the end, the basic idea is "Each individual gate. Because each heater temperature control method is adopted, naturally, it is necessary to provide an expensive and bulky temperature control function, and therefore, it is necessary to secure a wide working space, etc. On the other hand, disconnection accidents, failure problems, troublesome work problems, and various non-negligible loss, safety, work environment, etc., associated with the routing of lead wires and cords over many lines. That was because there was no time to enumerate the problems based on the conventional technology.

[0003]

The mini-runner type mold based on the conventional technology has a number of problems as described above. Was. The present invention has been made in view of the above point, and the problem to be solved by the present invention is "this kind of mini-runner type mold". Mini-runner type mold "When considering from the original origin of the mold itself, here is a hint to try to elucidate. That is, the present invention relates to such a “mini-runner type mold having a built-in needle valve”.

[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 it relies on the conversion, it can be called Joule heat), in light of the rigorous fact that solving the difficult problems listed in the preceding paragraphs can never be done, it is fundamental and fundamental here. It is a thing that has led to a bold change in thinking. But furthermore,
In order to adopt the instantaneous heating method near the nozzle gate based on a new heat source as described, it is necessary to drastically jump to the idea of `` a sprueless mini-runner type mold '' and finally realize it. exist. Thus,
Due to the drastic promotion of the radical change of ideas as described above, all the various difficult problems and issues mentioned above can be completely cleared at once. You.

[0004]

SUMMARY OF THE INVENTION The present invention, from a point of view, which has been set forth in detail in each of the relevant columns, not only in theory but also in its most rational, fundamentally solution. It is something that can be proposed. If so, in order to realize the most ideal and perfect "mini-runner type mold" in this stage, what kind of problems must be solved in the current situation, Starting from the starting point, the means to solve the problem are sequentially picked up based on the answer.
That is,. First of all, no electrical heater circuit is used. . Therefore, an ultrasonic energy source is newly adopted as an equivalent thermal energy source corresponding to the calorific value of the heater. . By converging the ultrasonic energy of the item to the needle part, which forms a needle valve structure, instantaneous heating with excellent responsiveness can be realized. . In the past, in the history of synthetic resin injection molding, it has been said that "it is absolutely indispensable, and it is impossible to think about eliminating such things, and it is impossible". In addition, “sprue” itself is called “sprueless”. As described above, by taking measures to solve the problems according to the items to be described in detail, it is possible to solve all the various difficult problems related to the mini-runner type mold at once. is there. Therefore, the specific means regarding the terms (1) to (6) are as follows. From the upper part, a fixed half block (F, H, B) formed by fixing a top base plate (T), a manifold block (M, B), a spacer block (S, B), a plate (P).
And, on the other hand, moving-side cavity plates (M, C, P) in which a plurality of cavities (C) are drilled in place, spacer blocks (S, B), etc.
The moving-side cavities (M, H, B), etc., which are fixed, are assembled in a hot runner type mold (H, C, E) for injection molding, and the moving-side cavities are formed as described above. Perforate the tea plate (M, C, P) at an appropriate position, and pierce a plurality of cavities (C)... And a bushing (B) fitted and fixed to the plate (P). And between the nozzle gates (N, G)... So that the molten resin (M) can communicate and flow freely.
Further, regarding the temperature control in the vicinity of the nozzle gates (N, G)... Near the nozzle gate (N), a nozzle horn element capable of instantaneously heating the tip needle portion (S, N) by ultrasonic energy. (N, H, E) are orthogonally connected to the nozzle gates (N, G), respectively, as described above. Mini runner type mold (U,
S, R, C), many of the difficult problems that can be described have all been cleared at once.
Because the structure is simple, the number of component parts is very small, and the processing and manufacturing is very easy. Therefore, the manufacturing cost is low and cheap, which is already known Can be mounted on the injection molding machine mold,
Further, even when setting the temperature conditions, there is no need for a high technical level or intuition, etc., and the practical effects are so large that they cannot be measured.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION "A sprueless mini-runner type mold applying ultrasonic energy" according to the present invention
Is the previous section

[0004]

In the present invention, for example, the present invention employs a new "sprueless mini-runner type mold applying ultrasonic energy". Needless to say, if it is installed in an existing injection molding machine die, etc., various difficult problems and problems until now are
There is no doubt that everything can be cleared at once. Thus, what can be clearly stated is the fact that the energy of the ultrasonic wave, which is completely independent of the electric heat energy, is employed. That is, while the basics in the conventional technology were "Joule heat",
Since the technical basic base according to the present invention is a physical "ultrasonic wave", in other words, "a kind of wave", and if expressed simply, it can be regarded as a "a kind of vibration phenomenon". Nothing else. Here, the embodiment of the present invention will be described as follows. Now, the general molder is using the hot runner type molds used today,
That is, as shown in FIG. 1 of the accompanying drawings, in a conventionally known hot runner type mold, as shown in the drawing, a perforated hole is formed in a manifold block (M, B), and a molten resin branch runner is formed. The molten resin (M) passing through (M, B, W) flows to reach the vicinity of the injection gate hole while flowing, and on the other hand, the gate hole opening / closing needle valve (G, H,
V) Regarding the temperature control in the vicinity of the valve, it is needless to say that it has a fine adjustment temperature control function with high accuracy and extremely complicated as described in detail. Place. As seen from such conventional known products, there is naturally a limit in the high-precision temperature control of the molten resin (M) due to the configuration at the seed level, and therefore, the injection gate holes (I, G, H) and the runner hardened portion (R, H), sprue (S, R). As described in detail above, the embodiment of the present invention is different from the hot runner type mold in that a completely new ultrasonic energy is used as a heat source instead of an electric heater. Seeds, for the molding resin processing industry, can not be expected,
It's no exaggeration to say that epoch making. According to the present invention, when setting the molding temperature condition which is the most important in the synthetic resin molding operation, the operation panel (not shown) relates to the ultrasonic frequency transmitted from the ultrasonic oscillator element (not shown). ), Etc.,
Fine adjustment can be performed very easily by turning the knob. Thus, to date, all the problems and problems of troublesome headaches have been solved all at once, and at the time of setting the molding temperature conditions, the operation is easy, It can be stabilized even in a high-precision temperature range, and its durability is maintained.

[0006]

An embodiment of the present invention will be described with reference to FIG. First, in FIG. 2 of the present embodiment, a partially omitted main part front view in a case where the present invention is used in a general hot runner type mold for injection molding is shown. Things. In the drawings, all electric circuits are omitted. That is, a top base plate (T), a manifold block (M, B), a spacer block (S, B), a plate (P)...
A fixed half block (F, H, B) formed by being fixed;
On the other hand, moving-side cavity plates (M, C, P) for piercing a plurality of cavities (C), spacer blocks (S, B)... Moving side half-blocks (M, H, B), etc., in a hot runner type mold apparatus (H, C, E) for injection molding, which is assembled and configured. (M, C, P) and a plurality of cavities (C)... And a bushing (B) fitted and fixed to the plate (P). The molten resin (M) is configured to be able to communicate and flow between the gates (N, G) for use.
Regarding the temperature control in the vicinity of the nozzle gates (N, G)... (S), a nozzle horn element (N) capable of instantaneously heating the tip needle portion (S, N) by ultrasonic energy. , H, E) are orthogonally opposed to the nozzle gates (N, G), respectively, as described above. A sprueless mini-runner mold for applying ultrasonic energy. (U, S, R, C), (G) in the figure is a molded product, (H) is a fixed pipe heater for a manifold, (L) is a mold parting line, (M) , W) represent the main runners respectively. As described above, with the configuration as described in detail, with respect to the temperature control near the nozzle gate (N, G) (S), which was a long-awaited wish, instantaneous heating with excellent responsiveness can be performed. Therefore, the resin in the main runner (M, W) and the molten resin branch runner (M, B, W) at the time of the synthetic resin molding operation can always keep the molten state, On the other hand, as the hardened portion, only the runner hardened portion (R, H) and the molded product (G)... Remain, and in this case, "sprueless" in the original meaning, a minimal loss approaching the limit as much as possible This has the effect of producing tremendous profits.

[0007]

As described above, according to the present invention, the following practical effects are provided. First of all,
The present invention "a sprue-less mini-runner type mold applying ultrasonic energy" is a molding mold that is absolutely indispensable in a so-called synthetic resin molding factory or the like that performs molding processing. In the device, since it is related to a hot runner type mold with a built-in needle valve (in other words, a mini-runner type mold), the ripple effect produced by the present invention is There is something incalculable. Concerning its characteristic effects, the fundamental differences between the conventional configuration and the configuration of the present invention are as follows. As a heating source for the needle portion, electrical heat energy, in other words, Joule heat was used, whereas in the present invention, the energy of ultrasonic waves which is fundamentally different from Joule heat, in other words, The use of a heat source based on such ultrasonic vibration has brought about various characteristics and effects as described below. That is,. There is no need for electric heaters for heating around the needle part of the needle valve. . No temperature sensor for fine adjustment is required at all. . According to the term and the term, the mounting dimensions and the mounting accuracy of the mold can be greatly relaxed. . Achieved "spruelessness", a long-cherished wish in molding work. . 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. ▲ 10 ▼. Therefore, even an inexperienced person can perform the work in place of the conventional skilled person, and therefore, due to the simplification of the secondary work, the simplification of the mold itself, etc., the workplace is arranged, the safety measures, etc. As an ideal workplace, a strong environment can be promoted, which in turn has a great effect on improving productivity. As described above, the present invention has a simpler structure than the conventional known products from the items (1) to (10), so that the manufacturing is easy, the mechanism is compact, the space is saved, the energy is saved, and so on. Because it becomes possible, the price is low, cheap, and so on. Its practical effect is enormous, so the contribution of this kind to the industry is incalculable. .

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional front view of a main part of a generally known hot runner type injection molding die for injection molding, which is omitted in the drawings. All electrical circuits have been omitted.

FIG. 2 shows an embodiment of the present invention, in which a partly omitted cross section of a main part when a general "sprueless mini-runner type mold to which ultrasonic energy is applied" is shown. FIG. It should be noted that, even if the conventional die apparatus is equipped with such an element according to the present invention, it is represented as a completely similar relationship diagram. In the figure, all elements related to the electric system, that is, electric circuit diagrams, ultrasonic-related vibrators, transmitters, and the like are omitted.

[Explanation of symbols]

B Bushing C ... Cavity (plural) F, H, B Fixed half block G, H, V Needle valve for opening and closing gate hole H ... Fixed pipe heater for manifold I, G, H Injection gate hole L Mold parting Line H: Pipe heater for manifold M Molten resin M, B Manifold block M, B, W Molten resin branch runner M, C, P Moving side cavity plate M, H, B Moving side half block M, W Main runner N, G Nozzle gate N, H, E Nozzle horn element P Plate R, H Near runner hardened part S S, B Spacer block S, N Tip needle S, R Sprue T Top base plate U, S, R, C A sprueless mini-runner mold that uses acoustic energy

Claims (1)

[Claims] 1. A top base plate (T), a manifold block (M, B), a spacer block (S, B), a plate (P).
A fixed half block (F, H, B) formed by being fixed;
On the other hand, moving-side cavity plates (M, C, P) for piercing a plurality of cavities (C), spacer blocks (S, B)... The moving side half-blocks (M, H, B), etc. are assembled in a hot runner type mold (H, C, E) for injection molding, and the moving side cavity plate ( M, C, P) and a plurality of cavities (C)... And a bushing (B) fitted and fixed to the plate (P). The molten resin (M) is configured to be able to communicate and flow between the gates (N, G) for use.
Further, regarding the temperature control in the vicinity of the nozzle gates (N, G)... Near the nozzle gate (N), a nozzle horn element capable of instantaneously heating the tip needle portion (S, N) by ultrasonic energy. (N, H, E) are orthogonally connected to the nozzle gates (N, G), respectively, as described above. Mini runner type mold (U,
S, R, C).