JPH11291285A - Production of resin product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method capable of always advantageously producing a resin product having good appearance by abutting first and second members mutually to integrally fusing them by the molten resin charged in the gap between the flange provided to the first member and the second member. SOLUTION: The flange part of a first member and a second member are positioned so as to be mutually opposed relationship and the projection having the height imparting the gap between the flange part of the first member and the second member provided to the region on at least one of or both of the leading end side among the opposed surfaces of the flange part of the first member and the second member is brought into contact with the other opposed surface provided with no projection and, in this state, the first and second members are arranged in a mutually abutted state. After the gap is filled with the molten resin, the mutual opposed surfaces of the flange part of the first member and the second member are fused by the molten resin to integrate the first and second members.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a resin product, and more particularly to a method for partially forming a target resin product.
A first member and a second member having an outwardly extending flange portion are filled in a gap between the flange portion of the first member and the second member under a state where they abut against each other. The present invention relates to a method for advantageously producing a resin product integrally formed by being fused to a molten resin to be produced.

[0002]

2. Description of the Related Art Conventionally, various methods have been employed in the production of a resin product made of a thermoplastic resin. As one type of the resin product, a so-called fusion method is used to produce a desired resin product. Are known.

[0003] A method of manufacturing a resin product using this fusion method is, for example, as disclosed in Japanese Patent Publication No. 2-38377, first of all, by dividing a target resin product into two parts. After each molding, the two divided bodies are arranged in a receiving cavity in which they can be accommodated in a mutually abutting state, and then formed at respective abutting portions of the two divided bodies. By filling the gap with the molten resin and fusing the molten resin to the surface of each abutting portion of the two divided bodies providing such a gap, the two divided bodies are integrated, thereby achieving the purpose. To obtain a resin product.

Further, in such a resin product manufacturing method, generally, a molding die having a movable die and a fixed die for forming a molding cavity of two divided bodies is used. In each of the molding cavities, after molding each of the two divided bodies, while holding each divided body in a movable mold or a fixed mold, open the mold for molding, and then,
The movable mold and the fixed mold are re-moulded at a position where the two molded bodies can be abutted with each other, whereby the movable mold and the fixed mold are inserted into a predetermined receiving cavity formed between the movable mold and the fixed mold. Then, the two divided bodies are accommodated and arranged in a state where they abut against each other, and thereafter, the gap is filled with the molten resin.

However, in such a conventional method of manufacturing a resin product using a fusion method, as is well known, one of two divided bodies faces the other divided body, Further, when molding is performed with a flange portion that is fused to the molten resin on the opposing surface, the one divided body is formed by the vibration during opening and closing of the molding die as described above after molding of the two divided bodies. Is separated from the movable mold or the fixed mold cavity surface that holds the one divided body so that the two divided bodies are put into the receiving cavity. When housed, the front end portion of the flange portion is separated from the cavity surface of the housing cavity, and is formed between the flange portion of one divided body and the other divided body. It is than had been the often induced to position with gap is narrowed. Under such a condition, when the gap is filled with the molten resin, a part of the molten resin does not completely enter the narrowed gap and the tip of the flange portion peeled off from the cavity surface of the housing cavity. Flows between the site and the cavity surface,
As it solidifies, burr-like projections are formed on the surface of the flange opposite to the gap forming surface, that is, on the outer surface of the flange that provides the outer surface of the product, and as a result, the final product is obtained. This has caused a serious problem that the appearance of the glass has deteriorated remarkably.

[0006]

Here, the present invention has been made in view of the circumstances described above, and the object of the present invention is to provide a first resin product which partially constitutes a target resin product. The member and the second member are abutted against each other, and the molten resin filled in a gap formed between the flange portion provided on the first member and the second member. When manufacturing a resin product that is integrated by being fused, when the molten resin flows into the flange member of the first member on the surface opposite to the surface on which the gap is formed, the resin material flows to the outer surface of the product. It is an object of the present invention to provide a method by which the formation of burr-like projections can be reliably prevented, and a resin product having a good appearance can be advantageously produced.

[0007]

According to the present invention, in order to solve such a problem, a part of a target resin product is formed.
A first member having a flange portion extending outward, and a second member constituting the remaining portion of the resin product, after molding, respectively, can accommodate the first and second members In the housing cavity, the first member and the second member are housed and arranged while being abutted against each other, and in the abutted state, the space between the flange portion of the first member and the second member is provided. By filling the molten resin into the gap formed in the first member, and fusing the molten resin to the mutually facing surfaces of the flange portion of the first member and the second member. And the second member are integrated, and in the method of manufacturing the resin product, at least the tip of one or both of the facing surface of the first member facing the second member and the flange portion of the first member facing each other. For the side part, the molten tree A projection having a height that gives a gap to be filled is provided, and the first member and the second member are placed in the housing cavity while the projection is in contact with the other facing surface where the projection is not provided. After that, the space is filled with a molten resin.

That is, in the method for manufacturing a resin product according to the present invention, at least one of the opposing surfaces of the flange portion of the first member and the second member is filled with the molten resin. For example, in the state where the protrusion having a height that provides a gap is provided, for example, the first member is separated from the cavity surface of the accommodation cavity in a state where the distal end portion of the flange portion of the first member is separated from the cavity surface. Even when housed in the housing cavity, in such a housing cavity, the second member is housed, the first member and the second member are butted against each other, and the protrusion is By arranging the flange member of the first member, which is not provided with the flange member, in contact with the opposing surface of the second member, the front end portion of the flange member can be positioned in the housing cavity. Gap between the flange portion of the first member and the second member, which is large enough to accommodate the molten resin to be filled, It can be reliably formed.

Therefore, in such a method for manufacturing a resin product, when the first member and the second member are placed in abutting relationship, the flange portion of the first member and the second member are not connected to each other. Can always ensure that a gap large enough to accommodate the molten resin can be formed, so that a part of the molten resin introduced into the gap does not fit in the gap. In addition, it is possible to effectively eliminate the case where the metal flows into the surface of the flange portion opposite to the surface where the gap is formed and solidifies.

Therefore, according to the method for manufacturing a resin product according to the present invention, a burr-like portion is formed on a part of the outer surface of the product, which is provided on the surface of the first member opposite to the surface on which the gap is formed. The formation of the projections can be effectively prevented, and as a result, the desired resin product can be produced very advantageously and reliably with a good appearance.

In the method for manufacturing a resin product according to the present invention, the projection is advantageously formed to have a greater thickness than a flange portion of the first member. According to such a configuration, for example, since the flange portion of the first member is formed with a small thickness, the cooling operation after molding of the first member immediately cools and solidifies the flange portion. In the case where the flange portion cannot be easily melted at the time of contact with the molten resin and the flange portion is not easily fused to the molten resin, Also, by taking into account the thickness of the projection made thicker than such a flange portion, a state in which the inside of the projection is not completely cooled and solidified can be ensured, and thus, at the time of contact with the molten resin, The surface of the projection can be immediately melted, and can be quickly fused to the molten resin.

Therefore, according to the method of the present invention, it is possible to secure a sufficient fusion strength of the flange portion to the molten resin irrespective of the thickness of the flange portion of the first member, and to obtain the desired resin. The product can be manufactured with more stable quality in terms of the joining strength between the first member and the second member.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, in order to clarify the present invention more specifically, a method for manufacturing a resin product according to the present invention will be described in detail with reference to the drawings.

First, FIGS. 1 and 2 schematically show an example of a resin product manufactured according to the method of the present invention. As is clear from these figures, the resin product 10 of this specific example has an upper divided body 12 as a first member and a lower divided body as a second member, each of which has a cylindrical shape with one side closed. The body 14 is abutted and integrated with each other at respective opening-side edges, and has a generally cylindrical shape having bottoms on both sides in the height direction as a whole.

More specifically, the upper divided body 12 constituting the resin product 10 has a thin outward flange 16 on the outer peripheral surface of the opening end thereof.
An outer flange 18 having the same length and a greater thickness than the outward flange 16 of the upper divided body 12 is integrally formed on the outer peripheral surface of the lower divided body 14 at the opening end. Has been configured. Further, in the upper divided body 12, an annular projection 20 having an inner diameter slightly larger than the outer diameter of the opening-side end of the lower divided body 14 is provided on the lower surface of the base side portion of the outward flange portion 16. Are provided so as to extend continuously in the circumferential direction, and a plurality of gap forming projections 22 are provided on the lower surface of each of the distal end portion and the intermediate portion.
Are formed integrally at equal intervals in the circumferential direction. Note that the plurality of gap forming projections 22 are
0 and the outward flange portion 1 of the upper divided body 12
6 has a cylindrical shape having a diameter larger than the thickness dimension.

The annular projection 20 of the upper divided body 12 is fitted over the opening end of the lower divided body 14 and the tip surfaces of the plurality of gap forming projections 22 are connected to the lower divided body 14.
The upper divided body 12 and the lower divided body 14 are arranged so as to abut each other on the opening side edges in a state where the upper divided body 12 is in contact with the upper surface of the outward flange portion 18. A plurality of gap forming projections 22 of the upper split body 12 are provided between the facing surfaces of the outward flange portion 16 of the upper split body 12 and the outward flange portion 18 of the lower split body 14.
A fixed plate 24 having an annular shape as a whole, which is inserted and positioned, is fixed to the opposing surfaces of the upper and lower divided bodies 12 and 14 on the upper and lower surfaces thereof, and a gap is formed. At the insertion portion of the projection 22, it is fixed to the outer peripheral surface of the gap forming projection 22. Thereby, the upper divided body 12 and the lower divided body 14 are fixed to the fixed platen 24.
It is integrated through.

When the resin product 10 is manufactured, for example, an injection mold 26 as shown in FIG. 3 is used.

That is, the injection mold 26 used here is mounted on a mounting plate 28 so as to be in contact with the mounting plate 28 and is slidable on the mounting plate 28 in the vertical direction. And a movable mold 32 that is opposed to the fixed mold 30 in the left-right direction and is movably arranged in the facing direction.

The mounting plate 28 constituting the injection molding die 26 has a thick flat plate shape, and has a sprue bush 34 at a substantially central portion thereof which is brought into contact with a nozzle of an injection molding machine (not shown). Is attached and made up.

Further, the fixed mold 30 has a rectangular block shape. On the surface of the fixed die 30 facing the movable die 32, an upper divided body forming recess 36 and a lower divided body forming projection 38 are provided, respectively. The upper divided body forming recess 36 of the fixed mold 30 has a shape corresponding to the outer surface of the upper divided body 12 that provides the upper half of the target resin product 10, and its opening side portion is, An outward flange portion forming portion 37 having a shape corresponding to the outward flange portion 16 of the upper divided body 12 is formed. In addition, the lower divided body forming projection 38 has a shape corresponding to the inner surface of the lower divided body 14 that provides the lower half of the resin product 10.
Then, the fixed mold 30 is mounted on the mounting plate 28 in a vertical direction (direction indicated by an arrow A in FIG. 3) perpendicular to the direction facing the movable mold 32 by a known hydraulic mechanism or the like (not shown). Can be slid.

On the other hand, the movable mold 32 also has the same rectangular block shape as the fixed mold 30. Further, on the surface of the movable mold 32 facing the fixed mold 30, a lower divided body forming recess 40 and an upper divided body forming protrusion 42 are arranged in a vertical direction. An annular projection forming recess 44 and a plurality of gap forming projection forming recesses 46 are formed around the upper divided body forming projection 42. The lower divided body forming recess 40 of the movable mold 32 is provided with the lower divided body 14.
And the opening-side portion thereof is, in particular, an outward flange portion 1 of the lower divided body 14.
The outward flange portion forming portion 41 has a shape corresponding to the shape 8. Further, the upper divided body forming projection 42 has a shape corresponding to the inner surface of the upper divided body 12. FIG.
As shown in FIG. 4, an annular projection forming recess 44 and a plurality of gap forming projection forming recesses 46 formed around the upper divided body forming projection 42 are provided on the lower surface of the outward flange 16 of the upper divided body 12. Each of the provided annular projection 20 and the plurality of gap forming projections 22 has a shape corresponding to the shape. Then, such a movable mold 32 can be moved in both left and right directions (directions indicated by arrows: A in FIG. 3) opposite to the fixed mold 30 by a known hydraulic mechanism or the like (not shown). It is becoming.

The mounting plate 28 and the fixed mold 3
As shown in FIG. 5, when the fixed mold 30 is positioned at the lower limit of the slide movement position, the upper divided body of the fixed mold 30 is provided in the injection mold 26 having the movable mold 32 and the movable mold 32. Forming recess 36 and upper divided body forming projection 4 of movable mold 32
2 are opposed to each other, and the lower divided body forming projection 38 of the fixed mold 30 and the lower divided body forming recess 40 of the movable mold 32 are opposed to each other.
Then, under the state where the fixed mold 30 and the movable mold 32 face each other, the movable mold 32 is moved closer to the fixed mold 30 and the movable mold 32 and the fixed mold 30 are mold-matched. An upper divided body forming cavity 48 having a shape corresponding to the upper divided body 12 is formed between the upper divided body forming recess 36 of the fixed mold 30 and the upper divided body forming projection 42 of the movable mold 32 opposed to each other. On the other hand, between the lower divided body forming projection 38 of the fixed mold 30 and the lower divided body forming recess 40 of the movable mold 32, the lower divided body corresponding to the lower divided body 14 is formed. The molding cavity 50 is formed.

In the state where the upper divided body molding cavity 48 and the lower divided body molding cavity 50 are formed in this manner, the sprue bush 34 of the mounting plate 28 is formed.
Of the two sub sprues 54a and 54b provided in the fixed mold 30 is one of the sub sprue 5
4a, the runner 56 provided on the movable mold 32, and the fixed mold 30 and the movable mold 32, in the upper divided body forming recess 36 and the lower divided body forming recess 40, respectively.
The upper divided body molding cavity 48 and the lower divided molding cavity 50 are communicated with each other through gates 58 and 60 that open to the inside, and are thus injected from an injection molding machine (not shown). Molten resin can be introduced into the upper divided body molding cavity 48 and the lower divided body molding cavity 50 through the communication passage.

On the other hand, when the fixed mold 30 is positioned at the upper limit of the slide movement position, as shown in FIG. 9, the upper divided body forming recess 36 of the fixed mold 30 and the lower divided body 36 of the movable mold 32 are arranged. The forming recesses 40 are opposed to each other. Then, under the facing state, the fixed mold 30 and the movable mold 32 are matched with each other, whereby the upper divided body forming recess 36 of the fixed mold 30 and the lower divided body forming recess 40 of the movable mold 32 are formed. Between the divided body receiving cavity 6
4 are formed, and between the outward flange portion forming portion 37 in the upper split body forming recess 36 and the outward flange portion forming portion 41 in the lower split body forming recess 40, an outward flange portion receiving portion 66 is formed. Is formed.

Also, such a divided body housing cavity 6
Under the state where the 4 is formed, the sprue 52 of the sprue bush 34 of the mounting plate 28 is the other of the two sub-sprues 54a and 54b of the fixed mold 30, the runner 56 of the movable mold 32, and the other. In the movable mold 32, the movable die 32 is communicated with the outward flange portion accommodating portion 66 of the divided body accommodating cavity 64 through the gate 62 opened in the outward flange portion forming portion 41 of the lower divided body forming recess 40. Accordingly, the molten resin injected from the injection molding machine (not shown) can be introduced into the outward flange portion accommodation portion 66 through the communication passage.

When the intended resin product 10 is manufactured by using the injection mold 26 having the above-described configuration, for example, first, as shown in FIG. With the at the lower limit of the slide movement position,
By moving the movable mold 32 closer to the fixed mold 30,
The movable mold 32 and the fixed mold 30 are molded, and an upper divided body molding cavity 48 and a lower divided body molding cavity 50 are formed therebetween.

Next, as shown in FIG. 6, a resin material 68 which gives a desired resin product 10 is melted in a molten state.
A sprue 52, a sub-sprue 54a, a runner 56, and two gates 5 from a nozzle of an injection molding machine (not shown)
Injecting and filling into the upper divided body molding cavity 48 and the lower divided body molding cavity 50 through the flow passages composed of 8, 60.

Thereafter, the resin material 68 filled in each of the molding cavities 48 and 50 is cooled and solidified, and the upper divided body 12 and the lower divided body molding cavity 48 are formed in the upper divided body molding cavity 48. , The lower split body 14,
After each molding, as shown in FIG.
2 is separated from the fixed mold 30, and the molded upper divided body 12 and the lower divided body 14 are inserted into the upper divided body forming recess 36 of the fixed mold 30 and the lower divided body forming recess 36 of the movable mold 32. Place 40
The mold is opened while holding it inside and inside. In the upper divided body 12 thus formed, as shown in FIG. 8, the upper divided body 12 is arranged on the lower surface of the outward flange 16, that is, in the upper divided body forming recess 36 of the fixed mold 30. On the surface facing the movable mold 32, the annular projection 20 is provided at a base side portion thereof, and a plurality of the gap forming projections 22 are circumferentially provided at a tip side portion and an intermediate portion portion thereof. They are formed integrally at equal intervals. Also, although not explicitly shown in FIG.
When the mold is opened, the sprue 52 of the sprue bush 34 of the mounting board 28, the sub-sprue 54a and the gate 58 of the fixed mold 30, and the runner 56 of the movable mold 32 are opened.
The resin material solidified inside each of the gates 60 is discharged.

Subsequently, as shown in FIG. 9, the fixed mold 30 is slid upward to be positioned at the upper limit thereof, while the movable mold 32 is moved closer to the fixed mold 30 again, and the movable mold 32 is moved again. And the fixed mold 30 are matched. Thereby, the upper divided body forming recess 3 of the fixed mold 30 is formed.
6 and the lower divided body forming recess 40 of the movable mold 32, a divided body accommodating cavity 64 is formed, and the upper divided body forming recess 36 and the lower divided body forming recess 40 are formed. The upper divided body 12 and the lower divided body 14 which are respectively held are abutted at their respective opening side edges, and are accommodated in the divided body accommodating cavities 64.

At this time, simultaneously with the formation of the divided body accommodating cavity 64, the outward flange portion forming portion 37 in the upper divided body forming recess 36 and the lower divided body forming recess 40 are formed.
The outer flange portion accommodating portion 66 is formed between the outer flange portion forming portion 41 and the outer flange portion accommodating portion 41. The upper and lower split bodies are fitted to the outer end of the lower split body 14 while the tip surfaces of the gap forming projections 22 are in contact with the upper surface of the outward flange portion 18 of the lower split body 14. The outward flange portions 16 and 18 of the respective 12 and 14 are located in the outward flange housing portions 66.

As a result, as shown in FIG. 10, the outward flange portion 18 of the lower divided body 14 is
Gap forming projections 22 in the outward flange portion 16 of FIG.
The facing surface 67 of the outward flange portion forming portion 41 in the lower split body forming recess 40 with the outward flange portion 18
Side, and is brought into close contact with the opposing surface 67 which constitutes a part of the cavity surface of the divided body housing cavity 64. Further, the outward flange portion 16 of the upper divided body 12 is also formed by the outward flange portion 18 of the upper divided body forming recess 36 by the outward flange portion 18 of the lower divided body 14 with which the plurality of gap forming projections 22 abut. Is pressed against the surface 69 facing the outward flange portion 16 so as to be in close contact with the surface 69 that provides another part of the cavity surface of the split dragon housing cavity 64. As a result, a gap 70 having a shape corresponding to the fixed platen 24 is provided between the facing surfaces of the outward flange 16 of the upper split body 12 and the outward flange 18 of the lower split body 14.
Is formed. As is apparent from this, in this specific example, a plurality of gap forming projections 2 are formed.
2, at least one or both of the opposing surfaces of the flange portion of the first member and the opposing surface of the second member are provided with a height that provides a gap filled with the molten resin. That is, the projection is formed.

Next, as shown in FIG. 11, the same resin material 68 as the material for forming the upper and lower divided bodies 12 and 14 is used.
In a molten state, sprue 52, sub-sprue 54b, runner 5
6 and the gate 62, and is injected into the gap 70 of the outward flange portion forming portion 66 in the divided body housing cavity 64 to be filled.

At this time, the resin material 68 filled in the outward flange portion forming portion 66 is provided with the facing surfaces of the outward flange portion 16 of the upper divided body 12 and the outward flange portion 18 of the lower divided body 14, Outward flange portion 16 of the upper split body 12
The annular projections 20 formed in contact with the outer peripheral surfaces of the plurality of gap forming projections 22 are brought into contact with each other. As a result, since the outward flange portion 16 of the upper split body 12 is thin, the lower split body 14
Although the surface facing the outward flange portion 18 is not easily melted, the annular projection 2 of the outward flange portion 16 is formed with a greater thickness than the outward flange portion 16.
The outer peripheral surface of each of the zero and the plurality of gap forming projections 22 and the surface of the outer flange portion 18 of the lower split body 14 facing the outward flange portion 16 of the upper split body 12 are immediately melted. The surfaces thus melted are fused to the resin material 68.

After that, the resin material 68 filled in the gap 70 of the outward flange portion forming portion 66 is cooled and solidified.
Thus, as shown in FIG. 12, a plurality of gaps of the upper divided body 12 are provided between the facing surface of the outward flange portion 16 of the upper divided body 12 and the outward flange portion 18 of the lower divided body 14, as shown in FIG. Forming protrusion 22 is formed so as to be located in a state of being inserted, and upper and lower surfaces thereof are fixed to opposing surfaces of upper and lower divided bodies 12 and 14,
In addition, at the insertion portion of the gap forming projection 22, the upper divided body 1 is fixed to the outer peripheral surface of the gap forming projection 22.
Thus, the intended resin product 10 is obtained by integrating the lower part 2 with the lower divided body. Then, the movable mold 32 is replaced with the fixed mold 3
After opening the injection mold 26 at a distance from 0, the molded resin product 10 is removed from the injection mold 26.
It is released from the mold.

As described above, in this specific example, the upper divided body 1
When the lower split body 2 and the lower split body 14 are housed in the split body housing cavity 64, the outward flange portion 1 of the upper split body 12
The lower and upper divided bodies 1 are formed by a plurality of gap forming projections 22 provided on the lower surface of the front end part and the intermediate part of the lower divided body 6 contacting the outward flange portion 18 of the lower divided body 14.
The outward flange portions 16 and 18 of the respective outer flange portions 2 and 14 are disposed so as to be in close contact with the cavity surface of the divided body housing cavity 64 on the upper surface and the lower surface thereof. The resin material 6 between which the opposing surfaces 16 and 18 are fused together.
Since the gap 70 filled with the resin material 8 is formed, the molten resin material 6 is filled in the gap 70.
When the resin material 68 is filled, the resin material 68 is formed between the cavity surface of the divided body housing cavity 64, the upper surface of the outward flange portion 16 of the upper divided body 12, and the lower surface of the outward flange portion 18 of the lower divided body 14. There is absolutely nothing that flows in and solidifies.

Therefore, according to the method of this embodiment, the resin product 10 provided on the upper surface of the outward flange portion 16 of the upper divided body 12 and the lower surface of the outward flange portion 18 of the lower divided body 14 is formed. It is possible to effectively prevent the formation of burr-like projections on a part of the outer surface, and as a result, the target resin product 10 has a favorable appearance, is extremely advantageous and reliably. It can be manufactured.

In this embodiment, the plurality of gap forming projections 22 provided on the outward flange portion 16 of the upper divided body 12 have a diameter larger than the thickness of the outward flange portion 16. Accordingly, under the state in which the upper divided body 12 and the lower divided body 14 are housed in the divided body housing cavity 64, the divided body housing cavity 64
Of the upper and lower divided bodies 12 and 14 in the outward flange portion accommodation portion 66 of FIG.
When the outer peripheral surfaces of the plurality of gap forming projections 22 are immediately melted, the outer peripheral surfaces of the plurality of gap forming projections 22 are melted, and the resin material 68, 18 is contacted with the resin material 68. The outer flange portion 16 of the upper divided body 12 is formed to have a small thickness, so that the surface thereof is less likely to be melted at the time of contact with the resin material 68. Also, the fusion of the plurality of gap forming projections 22 to the resin material 68 as described above causes the outward flange portion 16 of the upper divided body 12 to
8 can be easily and reliably fused.

Therefore, in this specific example method,
Regardless of the thickness of the outward flange portion 16 of the upper split body 12, the fusion of the outward flange portion 16 of the upper split body 12 and the outward flange portion 18 of the lower split body 14 to the resin material 68 on the mutually facing surfaces. The strength can be sufficiently ensured, and therefore, the target resin product 10 can be more advantageously produced with more stable quality in terms of the joining strength between the upper divided body 12 and the lower divided body 14. It is.

Although the specific configuration of the present invention has been described in detail above, this is merely an example, and the present invention is not limited by the above description.

For example, in the specific example, the upper divided body 12 as the first member and the lower divided body 14 as the second member are used as molding dies used for molding the target resin product. In a state in which the upper divided body 12 and the lower divided body 14 that can be simultaneously molded and the molded upper divided body 12 and the lower divided body 14 are arranged to face each other, the outward flange portions 16 and A single injection molding die 26 is used to fuse the resin material 68 to the mutually opposing surfaces of the two and integrate the upper and lower divided bodies 12 and 14. 12 moldings,
The target resin product is formed stepwise by using three types of molds, each of which specializes and separates the molding of the lower divided body 14 and the integration of the two divided bodies 12, 14. You may do it.

In the specific example, the molding of the upper divided body 12, the molding of the lower divided body 14, and the integration of the divided bodies 12, 14 are all performed by the injection molding technique. However, it is of course possible to perform these three types of processes by a method other than injection molding.

Further, in the specific example, the upper divided body 12 as the first member and the lower divided body 14 as the second member are provided with the outward flange portions 16 and
On the opposing surfaces of the upper divided bodies 12, the upper divided bodies 12 are integrated by being fused to the resin material 68 filled in the gap 70 formed between the opposing surfaces. An outward flange portion (16, 18) is provided on only one of the upper and lower divided bodies 14, and the outward flange portion (16, 18) and the outward flange portion (16, 18) opposed thereto are provided. The upper divided body 12 or the lower divided body 14 is fused to the resin material 68 filled in the gap 70 formed between the upper divided body 12 and the lower divided body 14. 14 may be integrated.

Further, in the specific example, a plurality of gap forming projections forming the gap 70 filled with the resin material 68 in a state in which the upper divided body 12 and the lower divided body 14 are arranged to abut each other. 22 is provided only on the outward flange portion 16 of the upper divided body 12, but the gap forming projection 22 may be provided only on the lower divided body 14 or on the upper divided body 1.
Even if it is provided on both the lower part 2 and the lower divided body 14, there is no problem.

Further, such a gap forming projection 22 is
The gap 70 into which the resin material 68 is filled is provided on at least the front end portion of the opposing surfaces of the upper divided body 12 and the lower divided body 14 each provided with the outward flange portion (16, 18). It goes without saying that the shape and the number of arrangements are not limited to those shown in the above specific examples as long as they are provided with a height.

In addition, in the specific example, the upper divided body 1 as a first member, each of which has a cylindrical shape with one side closed.
2 and the lower divided body 14 as a second member are abutted and integrated at their respective opening edges, and have a cylindrical shape having bottoms on both sides in the height direction as a whole. For the manufacturing method of the configured resin product 10,
Although a specific example of what applied the present invention was shown, the present invention
In addition, a first member having an outwardly extending flange portion forming a part of a target resin product, and a second member forming a remaining portion of the resin product are abutted with each other. It is needless to say that the present invention can be advantageously applied to any method of manufacturing a resin product which is fused and integrated with a predetermined resin material in a state where the resin product is assembled.

In addition, although not enumerated one by one, the present invention
Based on the knowledge of those skilled in the art, various changes, modifications, improvements, and the like can be made, and any of such embodiments can be implemented in the present invention without departing from the spirit of the present invention. It is to be understood that they are included within the scope of the invention.

[0047]

As is apparent from the above description, according to the method for manufacturing a resin product according to the present invention, the formation of the gap formed between the first member and the second member in the flange portion. The flow of the molten resin into the surface opposite to the surface can be effectively prevented, whereby the formation of burr-like projections on the outer surface of the product provided on the opposite side can be reliably prevented. As a result, the desired resin product can be produced very advantageously and reliably with a good appearance.

[Brief description of the drawings]

FIG. 1 is an explanatory longitudinal sectional view showing an example of a resin product manufactured according to the method of the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is an explanatory longitudinal sectional view showing an example of a molding die used in the method for producing a resin product according to the present invention, showing a mold opening state;

FIG. 4 is an enlarged explanatory view as viewed from an arrow IV in FIG. 3;

FIG. 5 is an explanatory longitudinal sectional view showing a closed state of the molding die shown in FIG. 3;

FIG. 6 is an explanatory view showing one example of a process in the method for producing a resin product according to the present invention, and illustrates the inside of each of an upper divided body molding cavity and a lower divided body molding cavity formed in a molding die. Shows a state in which a resin material is filled.

FIG. 7 is an explanatory view showing another example of the process in the method for producing a resin product according to the present invention, in which a molding die is used in a state in which a molded upper divided body and a lower divided body are held. This shows an opened state.

FIG. 8 is an enlarged explanatory view taken in the direction of arrow VIII in FIG. 7;

FIG. 9 is an explanatory view showing still another example of the process in the method for producing a resin product according to the present invention, in which the molding die is closed again, and the molded upper divided body and lower molded body are separated. It is in a state where it is positioned in the divided body housing cavity while abutting each other.

FIG. 10 is a partially enlarged explanatory view of FIG. 9;

FIG. 11 is an explanatory view showing another example of the process in the method for producing a resin product according to the present invention, in which the upper divided body and the lower divided body are accommodated in the divided body accommodating cavity of the molding die. This shows a state in which the resin material is filled in the gap in the outward flange portion accommodating portion of the divided body accommodating cavity.

FIG. 12 is an explanatory view showing still another example of the process in the method for producing a resin product according to the present invention, showing a state in which the molding die is opened again and the molded resin product is released. ing.

[Explanation of symbols]

REFERENCE SIGNS LIST 10 resin product 12 upper split body 14 lower split body 16, 18 outward flange portion 22 gap forming protrusion 26 injection mold 30 fixed mold 32 movable mold 48 upper split body forming cavity 50 lower split body forming cavity 64 split body Housing cavity 66 Outward flange housing section 68 Resin material 70 Gap

Claims (2)

[Claims] 1. A part of a target resin product,
A first member having a flange portion extending outward, and a second member constituting the remaining portion of the resin product, after molding, respectively, can accommodate the first and second members In the housing cavity, the first member and the second member are housed and arranged while being abutted against each other, and in the abutted state, the space between the flange portion of the first member and the second member is provided. By filling the molten resin into the gap formed in the first member, and fusing the molten resin to the mutually facing surfaces of the flange portion of the first member and the second member. And the second member are integrated to produce the resin product, wherein at least the tip of one or both of the opposing surfaces of the first member and the second member facing each other. For the side part, the molten tree A protrusion having a height to provide a gap filled with fat, and contacting the first member and the second member with the housing cavity while bringing the protrusion into contact with the other facing surface where the protrusion is not provided. Wherein the molten resin is filled into the gap after being housed and disposed in the resin product. 2. The method for manufacturing a resin product according to claim 1, wherein said projection is formed with a greater thickness than a flange portion of said first member.