JP3727129B2 - Manufacturing method of resin molded product having embedded material - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a resin molded product in which an embedded material such as a metal part or an electric part is integrally embedded in a resin material and the outer surface thereof is covered with a resin coating material.
[0002]
[Prior art]
Conventionally, metal parts, electric parts, various sensors, and the like are coated with a resin material to improve corrosion resistance, weather resistance, insulation, and the like. However, the conventional one has only the outer surface of these embeddings coated with a resin material, and the thickness of the coating has a limit. Further, in the conventional one, the outer shape of the covering material is substantially the same shape as the outer shape of the implant, and the outer shape of the covering material cannot be different from the shape of the implant, and the dimensions, shapes, etc. The accuracy was also low.
[0003]
[Problems to be solved by the invention]
The present invention has been made on the basis of the above circumstances, and is a resin molded product in which various types of implants are embedded, the outer shape of which can be different from that of the implant, and the outer shape The present invention provides a method for producing a resin molded article having an embedding that is highly accurate in size and shape and that is easy and efficient to produce.
[0004]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided a method of manufacturing a resin molded product according to the first aspect of the present invention, wherein the holding pin protrudes into the cavity of the mold, and the holding pin is fitted into the fitting holding portion of the holding hole penetrating the implant. A step of fitting and holding the embedded in place, a step of closing the mold, a step of injecting a resin material into the cavity of the mold, and an injection step of the resin material And the step of retracting the holding pin before completion of the step .
[0008]
Therefore, since the holding pin is retracted after the resin material is filled in a large part of the space between the outer peripheral surface of the implant and the cavity, the implant remains in a predetermined position in the cavity after the retract. It can be held accurately, the embedding position of the embedding can be regulated accurately, and the production becomes efficient.
[0009]
In the manufacturing method according to the second aspect of the present invention, the cavity of the mold is inserted into the holding hole of the implant with a gap between the inner peripheral surface thereof. The core pin protrudes, and the holding pin is slidably fitted to the outer periphery of the core pin and is formed into a sleeve shape that is slidably closely fitted to the inner peripheral surface of the fitting holding portion of the holding hole. Thus, before the injection of the resin material into the cavity is completed, the sleeve-like holding pin is slid with respect to the core pin to be retracted from the cavity.
[0010]
Therefore, the resin material is filled between the outer peripheral surface of the core pin and the inner peripheral surface of the holding hole, and the inner peripheral surface of the holding hole is coated with the resin material with a predetermined thickness so that the outer surface of the resin coating material is covered. Opening through holes are formed.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 and 2 show an example in which the resin molded product of the present invention is used as a weight-type suction nozzle member of a sprayer.
[0012]
That is, FIG. 1 shows the entire sprayer, which has a container body 1 and a cap part 2, and a pump mechanism 3 is incorporated in the cap part 2. Then, by pulling the lever 4, the liquid in the container body 1 is sprayed from the nozzle 5. Further, a suction pipe 6 is suspended from the lower part of the cap part 2, and the suction pipe 6 is a flexible tube having a large flexibility, and a weight-shaped suction nozzle member 7 is provided at the lower end part thereof. It is attached.
[0013]
The suction nozzle member 7 has a weight sufficient to bend the suction pipe 6 and is configured to always move to the lowest position at the bottom of the container body 1 even when the sprayer is tilted. Has been. Therefore, even when the container body 1 is inclined and sprayed, the suction nozzle member 7 is always located below the liquid surface of the liquid in the container body 1 and can suck the liquid. It is comprised so that all the liquids in 1 can be used.
[0014]
The suction nozzle member 7 needs to have a large weight as described above, and needs to be resistant to liquid such as a chemical solution in the container body 1. For this reason, this suction nozzle member 7 has a structure as shown in FIG.
[0015]
That is, reference numeral 8 in the figure denotes an implant that acts as a weight, and the implant 8 is formed of a metal material having a large specific gravity such as brass. The outer peripheral surface of the embedded material 8 is integrally covered with a resin coating material 9 to improve the corrosion resistance. Further, the embedded body 8 has a simple cylindrical shape in order to reduce the processing cost, and a holding hole 30 is formed through the central portion. As shown in FIG. 5, the lower end portion of the holding hole 30 is formed with a large-diameter portion having a stepped portion 31 and an enlarged diameter. The large-diameter portion is fitted into a holding pin to be described later. The joint holding portion 35 is formed.
[0016]
Further, the outer shape of the resin coating material 9 is different from the outer shape of the embedded material 8, and portions having various functions are formed. That is, a cylindrical suction pipe mounting portion 10 is integrally projected from the upper end portion of the suction nozzle member 7. Further, a skirt portion 11 is formed at the lower end portion, and a plurality of protrusions 12 are formed at the lower edge portion of the skirt portion 11. The skirt portion 11 is in close contact with the bottom surface of the container body 1 and sucks liquid. To prevent it. A groove portion 13 is formed on the outer peripheral surface of the skirt portion 11, and this groove portion 13 is used for holding the suction nozzle member, which will be described later, on one side of the mold. is there.
[0017]
A suction passage 14 is formed through the central portion of the suction nozzle member 7, and the suction passage 14 is filled with resin with a predetermined thickness on the inner peripheral surface of the holding hole 30 at the center of the implant 8. The inner surface of the holding hole 30 of the implant 8 is also configured so as not to come into contact with the liquid. The resin coating material 9 is formed by injection molding a synthetic resin material, and the outer dimensions are formed with high accuracy.
[0018]
Next, an embodiment of a method for manufacturing such a suction nozzle member 7 will be described with reference to FIGS. 3 and 5 show a cross section of a part of a mold when the suction nozzle member 7 is manufactured by injection molding.
[0019]
First, the structure of the mold used for this manufacture will be described with reference to FIG. The mold is composed of a pair of molds 21 and 22 that are divided in the axial direction, and cavities 23 and 24 are formed, respectively. A gate 28 is formed in one mold, for example, the upper mold 22.
[0020]
In addition, the cavities 23 and 24 of these molds 21 and 22 are respectively formed with core pins 25 and 27 for forming the suction passage 14, which slide relative to the molds 21 and 22. It is configured to sink into the cavity. These core pins 25 and 27 are set to have a diameter smaller than the diameter of the holding hole 30 of the implant 8, and a predetermined gap is formed between the outer peripheral surface of these core pins and the inner peripheral surface of the holding hole 30. It is comprised so that.
[0021]
The other mold, for example, the lower mold 21 is provided with a holding pin 26. The holding pin 26 has an inner peripheral surface that is in close contact with the outer peripheral surface of the core pin 25, and an outer peripheral surface that is in close contact with the inner peripheral surface of the fitting holding portion 35 of the holding hole 30 of the implant 8. The peripheral edge portion of the tip is configured to abut on the step portion 31 of the holding hole.
[0022]
As shown in FIG. 5, a conical fitting projection 33 projects from the center of the tip surface of the core pin 27, and the tip surface of the core pin 25 corresponds to the fitting projection 33. A conical recess 32 having a conical shape is formed. Then, when the fitting protrusion 33 and the fitting recess 32 are fitted to each other, the tip portions of the core pins 25 and 27 are positioned concentrically with each other. The diameter of the tip of the upper core pin 27 is slightly smaller than the diameter of the tip of the lower core pin 25.
[0023]
Next, the manufacturing process of this injection molded product will be described. First, as shown in FIG. 3, the core pins 25 and 27 and the holding pin 26 are protruded, the above-described implant 8 is placed in the mold, and the fitting holding portion 35 of the holding hole 30 is held. The pin 26 is fitted. The holding pin 26 is closely fitted to the inner peripheral surface of the fitting holding portion 35, and the front end surface thereof abuts on the step portion 31 of the holding hole 30. Therefore, the implant 8 is accurately positioned and held in the mold cavity in the horizontal and vertical directions.
[0024]
Next, the molds 21 and 22 are closed, and a resin material is injected into the cavities 23 and 24 from the gate 28 of the upper mold 22. In this case, the fitting direction of the holding pin 26 and the fitting holding portion 35 is opposite to the direction of these gates 28. Therefore, even if the injection pressure from these gates 28, the implant 8 does not float or shift, and the implant 8 is accurately positioned and held.
[0025]
Next, before the injection of the resin material is completed, that is, after the resin material is filled in most of the space between the cavities 23 and 24 and the outer periphery of the implant 8, the holding pin 26 is moved backward. The tip end face is positioned on the same plane as the inner face of the cavity 21 of the lower mold 21.
[0026]
In this state, the injection of the resin material is continued, and the space after the holding pin 26 is retracted, that is, the outer peripheral surface of the lower core pin 25 and the inner peripheral surface of the fitting holding portion 35 of the holding hole 30. A resin material is also filled in the space between them. In this way, the resin material is covered so as to completely cover the outer peripheral surface of the implant 8, and the implant 8 is integrally embedded in the resin material, and the resin material is filled in the cavity. Thus, the resin coating material 9 having a predetermined outer shape is formed.
[0027]
Next, when the injection of the resin material is completed, the core pins 25 and 27 are retracted and pulled out, and the molds 21 and 22 are opened. In this case, since the groove portion 13 on the outer periphery of the skirt portion 11 is fitted in the lower mold 21, the injection molded product is held by the lower mold 21. And after a metal mold | die completely opens, the groove part 13 of this skirt part 11 is elastically deformed, and this injection molded product is removed.
[0028]
By the method as described above, an injection-molded article that completely covers such an implant 8 is manufactured. In this case, since the resin coating material 9 is formed by injection molding, the accuracy of its outer shape and dimensions is high. In addition, the resin coating material 9 having an outer shape that is completely different from the outer shape of the above-described implant 8 can be formed. In this embodiment, the hollow suction passage 14 can also be integrally formed by the core pins 25 and 27.
[0029]
In such a method, the structure of a mold or the like to be used is simple, and since the holding pin 26 is merely retracted at an appropriate timing during injection, the manufacturing is easy and efficient. Further, since the holding hole 30 is provided so as to penetrate through the implant 8, the resin material flows into the holding hole 26 from both ends after the holding pin 26 is retracted. The flow is good, and no cavities are formed inside.
[0030]
In addition, in said embodiment, although it is a thing regarding the resin molded product which has the suction passage 14 penetrated, this invention is not necessarily limited to this. For example, FIG. 6 and FIG. 7 show a resin molded product that does not have a through-hole as another embodiment and a manufacturing method thereof.
[0031]
In this case, for example, two holding holes 45 and fitting holding portions 44 that are penetrated in the same manner as described above are formed in the electric component or other embedded material 41, and the inside is filled with a resin material. ing. Further, the resin coating material 42 covering the embedded material 41 has, for example, a shape in which a mounting flange portion 43 or the like is protruded, and has an external shape different from the embedded material 41.
[0032]
In order to manufacture such a resin molded product, the embedded object 41 is disposed in the cavity of the mold 50, 51 as shown in FIG. Then, the projecting and retracting holding pin 52 is fitted into the fitting holding portion 44 of the implant 41 and held in a predetermined position, and thereafter, the resin material is injected in the same manner as in the above-described embodiment. Perform molding. In this embodiment, since no core pin is provided, the holding hole 45 and the fitting holding portion 44 are filled with a resin material.
[0033]
Furthermore, the present invention is not limited to the above embodiment. For example, the embedded material is not limited to the above-described weight and electric parts, but may be various other objects. Further, the shape and material of the resin coating material are not limited to those described above, and may be any other shape.
[0034]
In addition, the shape, number, arrangement, etc. of the above-mentioned embedded holding holes, fitting holding portions, holding pins, gates, etc. are appropriately set according to the shape of the embedded material or resin coating material. Of course, it is not limited to the above.
[0035]
【The invention's effect】
As described above, in the method of manufacturing a resin molded product according to the present invention, the holding pin is retracted after the resin material is filled in a large part of the space between the outer peripheral surface of the embedded material and the cavity. The embedded object can be accurately held at a predetermined position in the cavity, and the embedded position of the embedded object can be accurately regulated, and the production becomes efficient.
[Brief description of the drawings]
FIG. 1 is a side view of a sprayer provided with a suction nozzle member that is a resin molded product according to an embodiment of the present invention.
FIG. 2 is a longitudinal sectional view of a suction nozzle member according to an embodiment.
3 is a longitudinal sectional view of a mold used in an embodiment of a method for manufacturing the suction nozzle member of FIG.
FIG. 4 is a longitudinal sectional view of a mold corresponding to FIG. 3 for explaining a manufacturing method.
FIG. 5 is a longitudinal sectional view of a core pin and a holding pin.
FIG. 6 is a longitudinal sectional view of a resin molded product according to another embodiment.
FIG. 7 is a longitudinal sectional view of a mold showing a method for producing a resin molded product of another embodiment.
[Explanation of symbols]
7 Suction nozzle member (resin molded product)
8 Embedding member 9 Resin coating material 14 Suction passages 25 and 27 Core pin 26 Holding pin 30 Holding hole 35 Fitting holding part 41 Embedding member 42 Resin coating material 44 Fitting holding part 45 Holding hole 52 Holding pin

Claims (2)

A step of projecting the holding pin into the mold cavity;
Fitting the holding pin into a fitting holding portion of a holding hole penetrating the implant and holding the implant in a predetermined position; and
Closing the mold, and
Injecting a resin material into the cavity of the mold, and
Retreating the holding pin before the resin material injection step is completed;
A method for producing a resin molded article having an embedded material, comprising: In the cavity of the mold, a core pin that protrudes into the holding hole of the implant with a gap between the inner peripheral surface protrudes, and the holding pin is formed of the core pin. It is formed in a sleeve shape that fits slidably on the outer periphery and fits slidably tightly on the inner peripheral surface of the fitting holding portion of the holding hole.
Before the injection of the resin material into the cavity is completed, the sleeve-shaped holding pin is slid with respect to the core pin and retracted from the cavity, so that the outer peripheral surface of the core pin and the inside of the holding hole are Filled with a resin material between the peripheral surface, covered the resin material with a predetermined thickness on the inner peripheral surface of this holding hole, and formed a through-hole opened on the outer surface of the resin coating material,
A method for producing a resin molded product having an embedding according to claim 1.

Images