JP3705595B2 - Molding method of synthetic resin handle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for forming a handle made of synthetic resin, and is used for doors and drawers of houses, furniture, home appliances and vehicles, transport containers such as baskets and tool boxes, or cooking utensils and tableware, In particular, the present invention relates to a method for molding a synthetic resin handle having a mounting hole used for building materials such as doors, sliding doors, hinged doors and drawers.
[0002]
[Prior art]
Synthetic resin handles (handles and knobs) are often attached to doors and drawers with metal bolts or nuts. For this reason, there is a problem in strength when the screw portion is formed of a synthetic resin. Therefore, after the handle is formed, a mounting hole for attaching a female screw or a male screw is provided. (For example, refer to Patent Document 1).
[0003]
Therefore, in a method for forming a synthetic resin handle having a mounting hole, a protrusion such as a pin for forming the mounting hole is provided in the mold, and a molten synthetic resin raw material is injected from the gate into the mold. Molding methods have been employed.
[0004]
[Patent Document 1]
Registered Utility Model No. 3045509 (first page, summary)
[0005]
[Problems to be solved by the invention]
In such a synthetic resin grip molding method of the prior art, the molten synthetic resin material injected from the gate is diverted by the projection for forming the mounting hole, wraps around the projection, and the resin material joins again. However, since the temperature of the resin raw material is lowered before joining, the joined resin raw materials are not sufficiently fused, so that a refuse mark called a weld line remains. Therefore, there is a problem that the mechanical strength of the handle decreases in the vicinity of the weld line.
[0006]
Moreover, when metallic resin such as aluminum powder is mixed and glossy metallic resin is used as a raw material, there is a problem that unevenness in gloss occurs and the appearance is impaired. Therefore, the gate position has to be determined so that the weld line is not conspicuous, and the degree of freedom in gate design is reduced. Further, after molding, post-processing called gate cut is required to remove the resin remaining in the vicinity of the gate.
[0007]
An object of the present invention is to provide a method for forming a synthetic resin handle that does not generate a weld line, and to provide a handle that has excellent mechanical strength and does not impair the appearance.
[0008]
[Means for Solving the Problems]
As a result of intensive studies to solve the above problems, the present invention is a method for forming a synthetic resin handle having a mounting hole.
Filling the mold with the synthetic resin material melted from the gate of the mold, moving the pin forming the mounting hole in the mold direction, and pushing the resin material remaining in the vicinity of the gate into the mold, and A synthetic resin grip molding method is adopted, in which the pin is moved inward of the mold to mold the mounting hole.
[0009]
After the molten resin material is filled in the mold, the gate is cut by moving the pin forming the mounting hole in the mold direction and pushing the resin material remaining in the vicinity of the gate into the mold. Further, the pin is moved toward the inside of the mold to form a mounting hole. Therefore, since the resin raw material is not shunted by protrusions such as pins, no weld line is generated in the vicinity of the mounting hole. Further, since the gate is cut at the time of molding, there is no need to remove the molded resin remaining in the vicinity of the gate by post-processing after molding.
[0010]
Moreover, in the molding method of the synthetic resin handle having a mounting hole,
The synthetic resin raw material melted from the gate of the mold is filled in the mold, the first pin is moved in the mold inner direction to form a mounting hole, and the mold inner direction with respect to the first pin A synthetic resin handle characterized in that a second pin externally movably moved is moved inward of the mold, the resin material remaining in the vicinity of the gate is pushed into the mold, and the mounting hole is formed. The molding method can also be adopted.
[0011]
Furthermore, in the molding method of the synthetic resin handle having a mounting hole,
The synthetic resin raw material melted from the gate of the mold is filled in the mold, the second pin is moved inward of the mold, the resin raw material remaining in the vicinity of the gate is pushed into the mold, and the second Also adopts a synthetic resin grip molding method, wherein the mounting hole is molded by moving the first pin inserted in the mold so as to be movable in the mold inner direction with respect to the two pins. it can.
[0012]
The pin for forming the mounting hole is divided into a first pin for forming the mounting hole and a resin raw material remaining in the vicinity of the gate into the mold, and the second pin is divided into the second pin. The structure is interpolated and can move toward the inside of the mold without being limited to each other.
[0013]
Therefore, first the first pin is moved inward of the mold to form the mounting hole, then the second pin is moved inward of the mold and the resin material remaining in the vicinity of the gate is pushed into the mold for mounting. Holes can be formed. On the contrary, first, the second pin is moved in the mold direction, the resin material remaining in the vicinity of the gate is pushed into the mold, and then the first pin is moved in the mold direction to form the mounting hole. You can also.
[0014]
Moreover, since the depth which pushes in the 1st and 2nd pin which shape | molds an attachment hole can be changed, the molded article from which the depth of an attachment hole differs can be shape | molded, without replacing | exchanging a pin.
[0015]
A synthetic resin grip molding method in which the synthetic resin grip is a synthetic resin grip for building materials can also be employed.
[0016]
When attached to building materials such as doors, sliding doors, hinged doors and drawers, a mechanical load is applied to the handle, particularly in the vicinity of the attachment hole, when the door is opened and closed. Since the handle formed by the present invention has no weld line and is excellent in mechanical strength, it can be suitably used as a handle for building materials.
[0017]
A synthetic resin grip forming method in which the synthetic resin raw material is a metallic resin can also be employed.
[0018]
A handle may be formed on the glossy metallic resin. The metallic resin is a resin in which a metal powder such as aluminum is mixed in a synthetic resin, and the metal powder has a gloss. When the weld line is generated, the gloss is uneven, which may impair the beauty. For this reason, the gate position is determined so that the weld line is not conspicuous. However, according to the method of the present invention, the necessity is eliminated, and the degree of freedom in gate design increases. As a result, more products can be molded simultaneously with one mold.
[0019]
In addition, the handle molded by the molding method of the present invention includes a generally U-shaped handle (handle) and a knob having a substantially circular shape attached to a hinged door or a drawer.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a forming method according to the present invention will be described with reference to the drawings. FIG. 1 is a schematic perspective view showing a handle and a knob according to the present invention. FIG. 1A is a view showing a handle, and has attachment holes 11 at both ends of a substantially U-shaped handle 10. FIG. 1B is a diagram showing a knob. The knob 20 has a substantially circular shape, and has a mounting hole 21 at the center of one end. After the molding, if necessary, a female screw or a male screw is inserted into the mounting holes 11, 21, and then the handle 10 or the knob 20 is attached to a door, a sliding door, a hinged door, a drawer, or the like.
[0021]
2 to 5 are schematic cross-sectional views of the main part of the mold showing the molding method according to the present invention, and show a part for molding the vicinity of the mounting hole. Although not shown in the drawing, in the case of a mold for forming the handle 10, a substantially U-shaped cavity is continuous, a protrusion for forming the mounting hole 21 is provided at the other end, and the mold 1 is closed. . Since the mounting hole at the other end is molded without the resin raw material 3 being diverted, the projection hole may be provided in the mold 1 as usual. Further, in the case of a mold for molding the knob 21, cavities corresponding to the shape of the knob 21 are connected, and the mold 1 is closed.
[0022]
FIG. 2 shows a state in which the molten resin material 3 is filled into the mold 1 through the gate 2. In this state, the resin raw material 3 remains in the vicinity of the gate 2, and the pin 4 for forming the attachment hole is not inserted into the mold 1. Incidentally, 3a is a metal powder mixed in the resin raw material, and metal powder such as aluminum, flakes and the like are used.
[0023]
Next, as shown in FIG. 3, when the pin 4 moves into the mold 1, the resin raw material 3 remaining in the vicinity of the gate 2 is pushed into the mold 1 by the pin 4. That is, the resin raw material 3 in the vicinity of the gate 2 is eliminated, and gate cutting is performed.
[0024]
Further, as shown in FIG. 4, when the pin 4 moves to a predetermined position in the mold 1, an attachment hole is formed by the pin 4. Therefore, since the pin 4 is pushed into the resin material 3 and the mounting hole is formed, the resin material 3 is not divided or joined. As a result, a molded product without a weld line is molded.
[0025]
Then, as shown in FIG. 5, when the mold is released after cooling, a molded product of the handle 10 in which the attachment hole 11 is formed is completed. Further, the mold may be released by moving the pin 4 further into the mold 1. The filling of the resin raw material 3 and the movement of the pins 4 can be performed by a known injection molding apparatus.
[0026]
FIG. 6 is a schematic cross-sectional view of a main part of a mold showing another molding method according to the present invention. In the figure, the pin 4 for forming the attachment hole is divided into a first pin 41 for forming the attachment hole and a resin raw material remaining in the vicinity of the gate into the mold to be divided into a second pin 42. The pin 41 is inserted into the second pin 42 and is configured to be movable in the mold 1 without being limited to each other.
[0027]
As shown in FIG. 6, after the resin raw material 3 is filled in the mold 1, first, as shown in FIG. 7, the second pin 42 moves into the mold 1 and remains in the vicinity of the gate 2. The resin raw material 3 is pushed into the mold 1. Next, as shown in FIG. 7, the 1st pin 41 is moved inside the metal mold | die 1, and an attachment hole is shape | molded. As shown in FIG. 5, when the mold is released after cooling, a molded product of the handle 10 in which the attachment hole 11 is formed is completed.
[0028]
On the other hand, as shown in FIG. 9, first, the first pin 41 is moved into the mold 1 to form the mounting hole, and then the second pin 42 is moved into the mold 1 and near the gate 2. The resin raw material 3 remaining in the mold 1 may be pushed into the mold 1 to form a mounting hole.
[0029]
In FIG. 8 showing the completion of molding, the depth of pressing of the pin 4 is shallower than that in FIG. 5, but it can be pushed in as much as in FIG. 5, and the first and second molding holes are formed. Since the depth at which the pins 41 and 42 are pushed in can be changed, it is possible to form molded products having different depths of the mounting holes without replacing the pins 4.
【The invention's effect】
As described above, in the molding method of the present invention, the synthetic resin raw material melted from the gate of the mold is filled in the mold, and the pins for molding the mounting holes are moved inward of the mold and remain in the vicinity of the gate. Since the resin raw material is pushed into the mold and the pin is moved inward to mold the mounting hole, a synthetic resin handle without a weld line can be molded in the vicinity of the mounting hole. It is possible to provide a handle that has excellent mechanical strength and does not impair the beauty.
[Brief description of the drawings]
FIG. 1 (a) is a schematic perspective view showing a handle molded according to the present invention, and FIG. 1 (b) is a schematic perspective view showing a knob molded according to the present invention.
FIG. 2 is a schematic cross-sectional view of a main part of a mold showing a molding method according to the present invention.
FIG. 3 is a schematic cross-sectional view of a main part of a mold showing a molding method according to the present invention.
FIG. 4 is a schematic cross-sectional view of a main part of a mold showing a molding method according to the present invention.
FIG. 5 is a schematic cross-sectional view of a main part of a mold showing a molding method according to the present invention.
FIG. 6 is a schematic cross-sectional view of a main part of a mold showing another molding method according to the present invention.
FIG. 7 is a schematic cross-sectional view of a main part of a mold showing another molding method according to the present invention.
FIG. 8 is a schematic cross-sectional view of a main part of a mold showing another molding method according to the present invention.
FIG. 9 is a schematic cross-sectional view of a main part of a mold showing another molding method according to the present invention.
[Explanation of symbols]
1 Mold 2 Gate 3 Resin material 4 Pin 10 Handle 11, 21 Mounting hole 20 Knob 41 First pin 42 Second pin

Claims (4)

In the molding method of the synthetic resin handle having the mounting hole,
The synthetic resin raw material melted from the gate of the mold is filled in the mold, the first pin is moved in the mold inner direction to form a mounting hole, and the mold inner direction with respect to the first pin A synthetic resin handle characterized in that a second pin externally movably moved is moved inward of the mold, the resin material remaining in the vicinity of the gate is pushed into the mold, and the mounting hole is formed. Molding method. In the molding method of the synthetic resin handle having the mounting hole,
The synthetic resin raw material melted from the gate of the mold is filled in the mold, the second pin is moved inward of the mold, the resin raw material remaining in the vicinity of the gate is pushed into the mold, and the second A method for molding a synthetic resin handle, wherein the mounting hole is formed by moving a first pin, which is inserted in the mold so as to be movable in the mold inner direction, with respect to the two pins . The method for forming a synthetic resin handle according to claim 1 or 2, wherein the synthetic resin handle is a synthetic resin handle for building materials . The method for molding a synthetic resin handle according to any one of claims 1 to 3, wherein the synthetic resin raw material is a metallic resin .

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