JP2000108162A - Manufacture of resin product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture quickly a resin product comprising a holding member constituted of a prescribed resin material and a sliding member constituted of the same material as the holding member and held slidably in relation to the holding member, by simplified manufacturing processes. SOLUTION: A first molding cavity giving either one of a holding member and a sliding member and a second molding cavity giving the other of them are formed. A resin material is filled in the first molding cavity and one member is molded. In a state wherein the molded member is disposed in the second molding cavity, thereafter, the resin material is introduced into the second molding cavity and the other member is molded in such a fashion that it is not fusion-bonded to the foregoing member, with the surface temperature of this member set not to be equal to or higher than the melting temperature of the resin material giving it. By this method, the sliding member and the holding member can be manufactured in a state wherein the former is held slidably in relation to the latter.

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 holding member made of a predetermined resin material, and the same resin material as the holding member, and slidable with respect to the holding member. The present invention relates to a method for advantageously manufacturing a resin product including a sliding member held by a sliding member.

[0002]

2. Description of the Related Art Conventionally, resin products including a holding member and a sliding member slidably held on the holding member have been used for various purposes. For example, a product having a cylinder and a piston movably held in the cylinder in the axial direction is used as a damper, a piston pump, or the like. A handle having a handle rotatably held around a rotation axis is used as a door inside handle or a door outside handle of a vehicle, and further includes a housing and a predetermined rotation with respect to the housing. A product having a blade rotatably held around a moving axis has been used as a vehicle register or the like.

By the way, when such a resin product is manufactured, if the holding member and the sliding member are formed of the same kind of resin material, only one kind of resin material needs to be prepared. The time and effort for preparing the resin material can be effectively reduced, the manufacturing process of the intended resin product can be advantageously simplified, and as a result, the resin product can be manufactured more quickly. Become.

However, in a conventional method of manufacturing a resin product in which the holding member and the sliding member are made of the same kind of resin material, the holding member and the sliding member are not fixed to each other without being fixed. In order to ensure that a good sliding state between both members can be ensured, the holding member and the sliding member are each separately molded, and then the molded sliding member is moved with respect to the holding member. An assembling process is employed in which the holding member and the sliding member are molded using the same type of resin material so that the manufacturing process can be simplified. Therefore, the above-mentioned large merits associated with the above-mentioned processes have been significantly impaired by the use of such an assembling process.

[0005]

Under such circumstances, the present invention has been made in view of the above-described circumstances, and a solution thereof is to provide a holding member made of a predetermined resin material, When manufacturing a resin product made of the same resin material and including a sliding member slidably held with respect to the holding member, an assembling step of the holding member and the sliding member may be omitted, Accordingly, it is an object of the present invention to provide a method in which a target resin product can be rapidly manufactured in a simpler manufacturing process.

[0006]

In order to solve such a problem, in the course of various studies conducted by the present inventor, a conventionally known insert molding method, that is, a resin insert part is arranged in a predetermined molding cavity. By introducing a resin material into the molding cavity under the
It is well known that a resin material is introduced into the molding cavity so as not to melt the surface of the insert component when performing a method of manufacturing a resin product in which the insert component is integrated. Attention was paid to the fact that the insert part was not fused (fixed) to the resin material introduced into the molding cavity, and this was changed to a holding member made of the same kind of resin material and a slidable member. The idea was to use the method for manufacturing a resin product having a sliding member to be held.

Here, the present invention has been completed as a result of further intensive studies by the present inventors based on the above-described idea, and the feature of the present invention is that it is made of a predetermined resin material. In a method of manufacturing a resin product including a holding member and a sliding member made of the same resin material as the holding member and slidably held on the holding member, the holding member and the sliding member Forming a first molding cavity for providing one of the members, and a second molding cavity for providing the other of the members, and forming the resin material in the first molding cavity. And after molding the one member, under the condition that the one molded member is arranged in the second molding cavity, the surface temperature of the one member is the resin material constituting the same. Melting The sliding member is formed by introducing the resin material into the second molding cavity so that the temperature does not exceed the temperature, and molding the other member without fusing it to the one member. Is to obtain the sliding member and the holding member in a state of being slidably held with respect to the holding member.

That is, in the method for producing a resin product according to the present invention, one of the holding member and the sliding member, which has been molded earlier in the first molding cavity, is provided with the other member. Under the condition that the surface of the one member is not melted under the condition of being placed in the second molding cavity, a resin material of the same type as the resin material providing the one member is provided in the second molding cavity. To form the other member without being fused to the one member, so that the sliding member is slidably held on the holding member. When the sliding member and the holding member are manufactured, the state in which the sliding member is slidably held with respect to the holding member is obtained when both the sliding member and the holding member are manufactured. Can be secured Therefore, unlike the conventional method of manufacturing the sliding member and the holding member using one type of resin material, after assembling the sliding member and the holding member, the assembly for assembling the two members to each other is performed. There is no need to use the attaching process.

Therefore, in such a method for manufacturing a resin product, an assembling step of assembling the manufactured holding member and the sliding member to each other can be advantageously omitted, whereby the holding member and the sliding member are made of the same kind of resin material. Advantages obtained by molding the sliding member, namely, the labor required for preparing the resin material can be advantageously reduced, and the amount of the labor is reduced, the desired resin product is reduced. The advantage that it can be manufactured quickly can be effectively enjoyed.

Further, according to the method for manufacturing a resin product according to the present invention, a holding member made of a predetermined resin material and the same resin material as the holding member are slidable with respect to the holding member. Thus, the resin product including the sliding member held in the above-mentioned manner can be manufactured even more quickly in a simpler manufacturing process than when a conventional manufacturing method is adopted.

In the method of manufacturing a resin product, when the resin material is introduced into the second molding cavity under the arrangement state of the one member, the surface temperature of the one member is reduced by the surface temperature of the one member. As a method for preventing the melting temperature of the resin material from giving rise to, for example, lowering the temperature of the molding die in which the first molding cavity is formed, or molding in the first molding cavity By lengthening the cooling time after molding of the one member, or the like, before the one member comes into contact with the resin material introduced therein in the first molding cavity, A method for lowering the surface temperature is advantageously adopted, and further, the temperature of the resin material introduced into the second molding cavity is lowered, or the temperature of the other member molded in the second molding cavity is reduced. By reducing the thickness of the resin material, or when introducing the resin material into the second molding cavity by injection molding, by reducing the injection speed of the resin material, A method of minimizing an increase in the surface temperature of the one member due to the contact with the material is also advantageously employed.

In the method for manufacturing a resin product according to the present invention, preferably, the holding member is first molded in the first molding cavity, and then the sliding member is moved to the second molding cavity. The method of molding in the molding cavity of the above will be adopted. By adopting such a technique, for example, the holding member has a housing portion in which a part or the whole of the sliding member is rotatably or movably housed in a sliding contact state, When manufacturing a resin product in which the sliding member is held by the holding member in a state where a part or the whole of the sliding member is housed in the portion, the inside of the holding portion of the holding member is Due to the molding shrinkage that occurs at the time of molding the sliding member, an appropriate clearance can be reliably formed between the inner surface of the housing portion and the outer surface of the accommodated portion with respect to the housing portion of the sliding member, Thus, the sliding state of the sliding member with respect to the holding member can be further better ensured.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, in order to clarify the present invention more specifically, the structure of 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 to 3 schematically show an example of a resin product manufactured according to the method of the present invention. As is clear from these drawings, the resin product 10 of this example includes a base 12 as a holding member and a handle 14 as a sliding member.

More specifically, the resin product 1 of such an example
The base 12 constituting the base member 0 is made of a polyamide resin (here, 6,6-nylon is used), and two support portions 16 having a substantially semi-disc shape are arranged to face each other. In this state, the two support portions 16, 16 are integrally connected to each other by two large and small connection portions 18, 20 formed integrally at both ends in the radial direction at the base portions of the two support portions 16, 16, respectively. In addition, a shaft hole 22 that penetrates the two support portions 16 in the thickness direction is formed substantially in the center of each of the two support portions 16.

On the other hand, the handle 14 is also made of the same polyamide resin (6,6-nylon) as the constituent material of the base 12. The handle 14 includes a grip portion 24 having a substantially rod-like shape and two shaft portions 26 projecting from both side surfaces of one end portion of the grip portion 24 in the longitudinal direction at a predetermined height. I have. The handle 14 is connected to one end of the grip 24 by the base 12.
With the two support portions 16, 16 positioned between the opposing surfaces and the other end portion protruding outward from the space between the opposing surfaces, the two support portions 16, 16 are supported by the two support portions 16, 16. The shaft portions 22 and 22 are rotatably inserted into shaft holes 22 and 22 provided in the portions 16 and 16, respectively. Thus, the resin product 10 includes the base 12 and the handle 14 supported rotatably about the shafts 26, 26 with respect to the base 12.
It is configured as an integrated product consisting of

When the resin product 10 is manufactured, for example, an injection molding die 28 as shown in FIG. 4 is used.

That is, the injection molding die 28 used here is made to contact the mounting plate 30 with the mounting plate 30, as is apparent from FIG. A fixed die 32 disposed slidably on the mounting board 30 in the vertical direction, and a movable die disposed in the left-right direction with respect to the fixed die 32 and movably disposed in the opposing direction. A mold 34, and a slide core 36 disposed between the fixed mold 32 and the movable mold 34 so as to be vertically slidable with respect to the fixed mold 32.
Further, two slide pins 40, 40 (only one is shown in FIG. 4), which are arranged to protrude and retract, respectively, into two slide pin insertion holes 38, 38 provided in the fixed mold 32. )).

The mounting plate 30 constituting the injection mold 28 has a thick flat plate shape, and has a sprue bush 42 at one end thereof which is brought into contact with a nozzle of an injection molding machine (not shown). Is attached and made up.

The fixed mold 32 has a rectangular block shape, and the movable mold 34 has a surface facing the movable mold 34.
And a cavity forming recess 44 that opens in the direction facing the slide core 36 and the direction facing the slide core 36. In the cavity forming recess 44, the slide core 36 and a part of the movable mold 34 have a size and a depth that can be inserted, and both side surfaces and a part of the bottom surface have: While the fixed-side base forming portion 46 is formed, a fixed-side handle forming portion 48 is formed in the remaining bottom surface portion excluding the part of the bottom surface. In addition, the fixed-type base forming portion 46 of the cavity forming concave portion 44 is connected to an outer portion of the base 12 of the target resin product 10 including the surfaces of the supporting portions 16, 16 on the opposite side to the opposing surfaces. It has a shape corresponding to a part of each of the parts 18 and 20, and further, the fixed side handle forming part 48 is provided with the handle 14 of the resin product 10.
Has a shape corresponding to the upper half of each of the grip portion 24 and the shaft portions 26, 26. Then, such a fixed mold 32 is moved up and down (FIG. 4) at right angles to the direction facing the movable mold 34 by a known hydraulic mechanism (not shown).
(In the direction indicated by the arrow in the middle, arrow a)).

On the other hand, the movable mold 34 has a substantially thick flat plate shape, and the fixed mold 32
The cavity forming projection 50 having a size capable of protruding into the cavity forming recess 44 is integrally formed.
In the cavity forming convex portion 50, a movable mold side base forming portion 52 is formed by four side surfaces excluding the distal end surface, and a movable mold side handle forming portion 54 is formed on the distal end surface. , Is provided. Furthermore, the movable mold side base forming portion 52 of the cavity forming convex portion 50
In this case, of the four side surfaces that constitute the same, two side surfaces opposed to each other in the length direction of the movable mold 34 (vertical direction in FIG. 4) are connected to the connecting portion 18 of the base 12 of the resin product 10. , 20 corresponding to each other's opposing surfaces, and two side surfaces opposing each other in the thickness direction (the direction perpendicular to the paper surface in FIG. 4) of the base 12. It has a shape corresponding to the 16 opposing surfaces. On the other hand, the movable mold side handle forming portion 54 provided on the distal end surface of the cavity forming convex portion 50 is formed of a stepped recess whose central portion is one step lower (deeper) than the outside. The handle 14 of the resin product 10 has a shape corresponding to a substantially lower half of the shafts 26, 26, and a recess at the center thereof has the handle 1.
The four grips 24 have a shape corresponding to a substantially lower half of the shaft forming portion. The movable mold 34 is configured to be movable in a direction facing the fixed mold 32 (a direction indicated by an arrow A in FIG. 4) by a known hydraulic mechanism or the like (not shown). is there.

The slide core 36 has a substantially thick flat plate shape, and has a size such that the entire slide core 36 can be inserted into the cavity forming recess 44 of the fixed die 32.
It is configured. In the slide core 36, one side in the width direction (the left-right direction in FIG. 4)
A slide core side handle forming portion 56 is provided,
A slide core side base forming portion 58 is provided on the other side. The slide core side handle forming portion 56 of the slide core 36 has a concave portion corresponding to a substantially lower half portion of the grip portion 24 of the handle 14 of the resin product 10, and a handle 14 provided at a distal end portion thereof. And a notch corresponding to a part of each of the shaft portions 26, 26. On the other hand, the slide core side base forming portion 58
Is formed by a notch corresponding to a part of the connecting portion 20 in the base 12 of the resin product 10. Then, such a slide core 36 is provided with a cavity forming recess 4 of the fixed mold 32 by a known hydraulic mechanism or the like (not shown) similar to the one mounted on the fixed mold 32 and the movable mold 34.
4 in the direction in which it enters and retracts (FIG. 4
It is configured to be slidable in the direction indicated by an arrow (C).

Further, the slide pins 40, 40 are large enough to be inserted into the slide pin insertion holes 38, 38 of the fixed die 32, and correspond to the shaft portions 26, 26 of the handle 14 of the resin product 10. It has a round bar shape. The positions of the slide pins 40, 40 which are removed from the slide pin insertion holes 38, 38 by a known hydraulic mechanism or the like (not shown)
A position where the distal end face is inserted into the slide pin insertion holes 38, 38 and is flush with a surface of the cavity forming recess 44 of the stationary mold 32 that provides the stationary mold side handle forming section 48 (see FIG. 5); And the cavity forming recess 44
Between the slide pin insertion holes 38, 38 between the surface on which the fixed die side base forming portion 46 is provided and the position (see FIG. 11). I have.

The mounting plate 30 and the fixed die 3
2. In the injection mold 28 having the movable mold 34, the slide core 36, and the slide pin 40, as shown in FIGS. 5 to 7, the fixed mold 32 is positioned at the upper limit of the slide movement position. In this state, the movable mold 34 and the slide core 36 are moved closer to and fixed to the fixed mold 32, and the mold is closed.
6, a base molding cavity 60 having a shape corresponding to the base 12 of the resin product 10 is formed between the movable mold side base forming portion 52 and the slide core side base forming portion 58, while a fixed mold side handle is formed. Part 48, movable-type handle formation part 54, and slide core-side handle formation part 56
A handle molding cavity 62 having a shape corresponding to the handle 14 of the resin product 10 is formed between the handle molding cavity 62 and the handle molding cavity 62. Here, the first molding cavity is constituted by the base molding cavity 60,
In addition, a cavity formed by combining the base molding cavity 60 and the handle molding cavity 62 constitutes a second molding cavity.

Further, with the base molding cavity 60 and the handle molding cavity 62 thus formed, the slide pins 40, 40 are fixed at their distal end surfaces in the cavity forming recesses 44 of the fixed mold 32. The slide pins 40, 40 are pushed into the slide pin insertion holes 38, 38 of the fixed mold 32 to a position flush with the surface on which the mold side handle forming portion 48 is provided.
The distal end portion of the base 40 traverses the supporting portion forming portions 61 and 61 in the base forming cavity 60 and is formed between the fixed type handle forming portion 48, the movable type handle forming portion 54, and the slide core side handle forming portion 56. The shaft forming portions 63 are respectively inserted into the shaft forming portions 63 of the handle forming cavity 62 to communicate the base forming cavity 60 and the handle forming cavity 62.
Are closed, so that both molding cavities 60,
62 is cut off. Then, thereby, the sprue 64 of the sprue bush 42 of the mounting board 30 is connected to one of the two sub-sprues 66a and 66b provided on the fixed die 30,
The molten resin injected from the injection molding machine (not shown) is introduced only into the base molding cavity 60 through the communication passage with the base molding cavity 60 through the runner 68 provided at the tip thereof. You are getting it.

Further, as shown in FIG. 10, in the injection molding die 28, the fixed die 32 is moved to a position where the fixed die 32 reaches the lower limit of the sliding position in the closed state as described above. Along with the mold 32, the movable mold 34, the slide core 36, and the slide pins 40, 40 are configured so as to be integrally movable downward by a predetermined dimension. Under the condition,
As shown in FIG. 11, the slide pins 40, 40 are provided with the cavity forming recess 4
4 is moved from a position flush with the surface providing the fixed mold side handle forming portion 48 to a position flush with the surface providing the fixed mold side base forming portion 46 in the cavity forming concave portion 44, Slide pin 4
0, 40 are disengaged from the shaft forming portions 63, 63 of the handle forming cavity 62 and the base forming cavity 60, and the base forming cavity 60 and the handle forming cavity 62 are passed through the shaft forming portions 63, 63. , So that they can communicate with each other. Then, as shown in FIG.
The sprue 64 of the sprue bush 42 is fixed
Of the handle forming cavity 62 through the other sub sprue 66b of the two sub sprues 66a and 66b provided in the
And the base molding cavity 60, the molten resin injected from the injection molding machine (not shown)
Through such a communication passage, it can be introduced into the handle molding cavity 62 and the base molding cavity 60.

When the intended resin product 10 is manufactured using the injection molding die 28 having the above-described configuration, for example, first, as shown in FIGS. With the fixed mold 32 positioned at the upper limit of the slide movement position, the movable mold 34 and the slide core 36 are moved closer to the fixed mold 32 to close the mold, and a base molding cavity is interposed therebetween. 60 and a handle molding cavity 62 are respectively formed. Also, at this time, the slide pins 40, 40 of the fixed mold 32 are moved until the front end surface thereof is flush with the surface of the cavity forming recess 44 of the fixed mold 32 where the fixed mold side handle forming portion 48 is provided. The slide pins 40, 40 are inserted into the insertion holes 38, 38 so that the slide pins 40, 40 are formed in the support molding portions 61, 61 of the base molding cavity 60 and the shaft molding portions 63, 63 of the handle molding cavity 62. The distal end portions are inserted into the respective insertion positions, and the space between the base molding cavity 60 and the handle molding cavity 62 is shut off.

Next, as shown in FIG. 8, a molten resin material 72 of a polyamide resin (6,6-nylon) which gives a target resin product 10 is injected at a resin temperature of 300 ° C. into an injection molding machine (not shown). The nozzle is injected into the base molding cavity 60 through a flow passage composed of the sprue 64, the sub-sprue 66a, and the runner 68 to be filled. When the molten resin material 72 is injected and filled into the base molding cavity 60, the leading ends of the slide pins 40, 40 are supported by the support molding parts 61, 61 of the base molding cavity 60 in the preceding mold closing step. Inside, and inside the shaft portion forming portions 63 of the handle forming cavity 62,
Since the base molding cavity 60 and the handle molding cavity 62 are shut off by being respectively inserted, the slide pins 40, 40 in the support part molding parts 61, 61 of the base molding cavity 60 are formed.
And the inflow of the molten resin material 72 into the handle insertion cavity 62 and the handle molding cavity 62 is prevented.

After that, the molten resin material 72 filled in the base molding cavity 60 is solidified by cooling for 20 seconds, and
The base 12 is formed. At that time, as shown in FIG.
The two support portions 16, 16 of the base 12 are molded in the support portion molding portions 61, 61 of the base molding cavity 60, respectively. Circular shaft holes 22, 22 corresponding to the outer shape of the slide pin 40 are provided at positions corresponding to the insertion portions of the slide pin 40 in the support portion forming portion 61.
Are formed respectively. Also, no molded product is molded in the handle molding cavity 62.

Next, the molded base 12 is positioned in the base molding cavity 60, and while the mold is closed, the movable mold is moved together with the fixed mold 32 until the fixed mold 32 reaches the lower limit of the sliding movement position. 34, the slide core 36, and the slide pins 40, 40 are integrally moved downward (see FIG. 10).
0, 40 is pulled and moved to a position flush with the surface of the cavity forming recess 44 of the stationary mold 32 on which the stationary mold base forming portion 46 is provided at the tip end surface thereof, and the shaft molding portion of the handle molding cavity 62 is moved. 63, 63,
The distal ends of the slide pins 40, 40 are respectively separated from the formed shaft holes 22, 22 of the bases 12, 12 (see FIG. 11). Then, in that state or such a fixed mold 32, a movable mold 34, and a slide core 3
6, and prior to the operation of moving the slide pins 40, 40, the injection mold 28 is cooled by a known method.
The temperature of the mold 28 is reduced to 30 ° C., thereby rapidly and sufficiently lowering the surface temperature of the formed base 12.

Subsequently, as shown in FIG. 10, the same polyamide resin (6,6-
A molten resin material 72 made of nylon (Nylon) is supplied to a sprue 6 from a nozzle of an injection molding machine (not shown) at a temperature of 300 ° C.
4, through the flow passage composed of the sub-sprue 66b and the runner 70, is injected into the handle molding cavity 62 to be filled.

At this time, the tips of the slide pins 40, 40 are connected to the shaft forming portions 63, 6 of the handle forming cavity 62.
3 and the shaft holes 22, 22 of the molded bases 12, 12
And the molten resin material 72 injected into the handle molding cavity 62 flows into the shaft holes 22, 22 of the bases 12, 12 through the shaft molding portions 63, 63, respectively. As a result, the base 12 is brought into contact with the high-temperature molten resin material 72 on the inner surfaces of the shaft holes 22, 22.
Since the surface temperature of the base 12 has been sufficiently lowered with the cooling of the
Contact with the shaft holes 22, 22 in the base 12.
It can be advantageously avoided that the temperature of the inner surface becomes higher than the melting temperature and the inner surface is melted.

Thereafter, the molten resin material 72 filled in the handle molding cavity 62 and the shaft holes 22 of the base 12 is cooled and solidified, so that the handle is formed in the handle molding cavity 62 as shown in FIG. 14 and the base portions of the shaft portions 26, 26 are formed, and the handle 1 is inserted into the shaft holes 22, 22 of the base 12.
The front end portions of the shaft portions 26, 26 are formed. As described above, since the inner surfaces of the shaft holes 22, 22 of the base 12 do not melt at all due to contact with the molten resin material 72 introduced into the shaft holes 22, 22, the shaft holes 2 of the base 12 are not melted.
Shafts 26, 26 of handle 14 molded in 2,22
Is formed so as to be rotatably inserted into the shaft holes 22, 22 without being fused to the inner surfaces of the shaft holes 22, 22. Thus, the base 12 and the shafts 26, 26
A handle 14 rotatably supported around,
The intended resin product 10 is obtained.

Finally, as shown in FIG. 12, the movable mold 34 and the slide core 36 are separated from the fixed mold 32, and the injection molding mold 28 is opened. The mold 10 is released from the injection mold 28.

As described above, in this embodiment, after the base 12 is molded with a predetermined polyamide resin in the base molding cavity 60 of the injection mold 28, the handle molding cavity formed in the mold 28 is formed. In 62, the handle 14 is molded from the same polyamide resin that provides the base 12 under conditions where the surface of the molded base 12 is not melted, so that the handle 14 After the base 12 and the handle 14 are molded from the same polyamide resin, respectively, the handle 14 can be rotated with respect to the base 12 because the handle 14 is rotatably supported with respect to the base 12. There is no need to employ a cumbersome assembling process that allows the support.

Therefore, according to the method of the present embodiment, the base 12 and the handle 14 made of the same polyamide resin are provided, and the handle 14 is rotatably supported with respect to the base 12. Becoming a Resin Product 1
0 can be produced even more quickly in a simpler process.

Further, in the present embodiment, the base 12 having the shaft holes 22, 22 is formed first, and thereafter, the shaft portion 2 rotatably inserted into the shaft holes 22, 22.
From the place where the handle 14 having the handles 6 and 26 is formed, the outer surfaces of the shafts 26 and 26 of the handle 14 and the base 12 formed earlier are formed by molding shrinkage inevitably caused when the handle 14 is formed. A suitable clearance can be formed between the inner surfaces of the shaft holes 22, 22 so that the shaft portions 26, 26 of the handle 14 with respect to the base 12.
A favorable turning state can be reliably ensured.

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

For example, in the above embodiment, the base molding cavity 60 for molding the base 12 as the holding member by cooling and solidifying the molten resin material 72 introduced therein, and the handle 14 as the sliding member in the same manner. Although one injection mold 28 having both a handle molding cavity 62 for molding is used, a mold having a base molding cavity for molding the base 12 and the molded base 12 are housed. In this state, a desired resin product may be molded using two types of molds having a handle molding cavity for molding the handle 14.

In the above-described embodiment, the molding of the base 12 and the molding of the handle 14 are performed by using the injection molding technique. Of course, it is also possible to carry out by a method.

Further, in the above-described embodiment, when the high-temperature molten resin material 72 is introduced into the handle molding cavity 62, the surface of the molded base 12 at the contact portion with the molten resin material 72 does not exceed the melting temperature. As described above, the molten resin material 7 is inserted into the handle molding cavity 62.
Prior to the introduction of 2, the injection mold 28 was cooled to about 30 ° C., but the temperature of the injection mold 28 after cooling is particularly limited to this. Instead, the surface temperature of the base 12 located in the base molding cavity 60 of the mold 28 can be sufficiently reduced so that the temperature of the base 12 does not become higher than the melting temperature even by contact with the molten resin material 72. If so, any temperature may be used.

In order to prevent the surface temperature of the base 12 from becoming higher than the melting temperature of the base 12 due to the contact with the molten resin material 72, besides the method shown in the above embodiment, It is also effective to sufficiently lower the surface temperature of the base 12 by lengthening the cooling time after molding of the mold 12, and to reduce the temperature of the molten resin material 72 introduced into the handle molding cavity 62. Lowering the thickness of the handle 14 formed in the handle forming cavity 62,
Alternatively, by lowering the injection speed of the molten resin material 72 injected into the handle molding cavity 62, the base 1 is brought into contact with the molten resin material 72.
It is also effective to suppress the rise in the surface temperature of the contact portion 2 as much as possible.

The type of the resin material used as the constituent material of the base 12 and the handle 14 is not particularly limited to the one shown in the above embodiment, but may be other than the polyamide resin (6,6-nylon). A thermoplastic resin material or a thermosetting resin material such as a phenol resin or a silicone resin can also be advantageously used. In particular, when a thermoplastic resin material is used, the thermoplastic resin material and the molten resin material 72 that provides the handle 14 can be used. Base 1 previously formed by contact
In order to avoid as much as possible that the surface temperature of No. 2 is raised to easily reach the melting temperature, it is desirable to use a high melting point thermoplastic resin material.

In addition, in the above-described embodiment, the method for manufacturing the resin product 10 includes the base 12 as the holding member and the handle 14 as the sliding member rotatably supported by the base 12. On the other hand, a specific example of an embodiment to which the present invention is applied has been described. However, the present invention further includes a resin cylinder as a holding member, and the same resin material as the cylinder, and the shaft of the cylinder is attached to the cylinder. A resin product used for a damper, a piston pump or the like, having a piston held as a sliding member movably held in a direction, a resin housing serving as a holding member, and the same resin material as the housing And a resin such as a resin product used as a vehicle register or the like, having a blade as a sliding member held rotatably around a predetermined rotation axis with respect to the housing. Material and a resin member made of the same resin material as the holding member, and any method of manufacturing a resin product including a sliding member slidably held with respect to the holding member, Of course, it can be applied advantageously.

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.

[0046]

As is apparent from the above description, according to the method for manufacturing a resin product according to the present invention, a holding member made of a resin material and a resin material identical to the holding member are used.
A resin product including a sliding member slidably held with respect to the holding member is manufactured even more quickly in a simpler manufacturing process than when a conventional manufacturing method is adopted. You will get.

[Brief description of the drawings]

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

FIG. 2 is an explanatory plan view of the resin product shown in FIG. 1;

FIG. 3 is an explanatory left side view of the resin product shown in FIG. 1;

FIG. 4 is an explanatory longitudinal sectional view showing an open state of an example of an injection mold used in the resin product manufacturing method according to the present invention.

FIG. 5 is a cross-sectional explanatory view showing a closed state of the injection molding die shown in FIG. 4;

6 is a sectional view taken along the line VI-VI in FIG. 5;

FIG. 7 is an explanatory sectional view taken along the line VII-VII in FIG. 5;

FIG. 8 is an explanatory view showing one example of a process in the method for manufacturing a resin product according to the present invention, and shows a state in which a molten resin material is filled in a base molding cavity formed in an injection mold. .

FIG. 9 is an explanatory view showing another example of the process in the method for producing a resin product according to the present invention, and shows a state where a base is molded in a base molding cavity.

FIG. 10 is an explanatory view showing still another example of the process in the method for manufacturing a resin product according to the present invention, showing a state in which a molten resin material is filled in a handle molding cavity formed in an injection mold. ing.

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 a handle is molded in a handle molding cavity and a desired resin product is molded.

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 an injection mold is opened and the molded resin product is released. ing.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Resin product 12 Base 14 Handle 28 Injection mold 30 Mounting plate 32 Fixed mold 34 Movable mold 36 Slide core 40 Slide pin 60 Base molding cavity 62 Handle molding cavity 72 Molten resin material

Claims (2)

[Claims] 1. A resin product including a holding member made of a predetermined resin material and a sliding member made of the same resin material as the holding member and slidably held on the holding member. In the method, forming a first molding cavity to provide any one of the holding member and the sliding member, and a second molding cavity to provide any other member of them Filling the first molding cavity with the resin material, molding the one member, and then placing the one molded member in the second molding cavity; The surface temperature of the member is not higher than the melting temperature of the resin material constituting the member, the resin material is introduced into the second molding cavity, and the other member is moved relative to the one member. Fusing By molding without the state in which the sliding member is slidably held with respect to the holding member, method for producing a resin product, characterized in that to obtain the holding member and they slide member. 2. The sliding member is molded in the second molding cavity after the holding member is molded in the first molding cavity first. 2. The method for producing a resin product according to item 1.