JPH0464420A - Injection molding machine - Google Patents

Abstract

PURPOSE:To manufacture easily a resin product comprised of a case member such as a fin duct and a blade member, by a method wherein the second resin material is fed to the second molding space formed within a mold from which a core rod is taken out and the second injection device forming a blade member is provided. CONSTITUTION:A case member 14 is formed by injecting and filling the first resin material 76 into the first molding space under a state where a core rod 54 is inserted. In this instance, a through hole 17 through which a support shaft 18 of a blade member 16 is pierced is formed into a wall part of a case member 14 by the core rod 54. Then after formation of the case member 14 like this the second molding space 44 is formed by taking out the core rod 54 from molds 20, 22. Then the blade member 16 is formed by injection and filling of the second resin material 78 into the second molding space 44.

Description

Detailed Description of the Invention (Technical Field) The present invention relates to a resin product having a structure in which at least one blade member is rotatably mounted inside a cylindrical case member, such as a fin duct for in-vehicle cooling and heating. This invention relates to an injection molding machine that can be manufactured easily and at low cost.

(Background Art) Air vents for heating and cooling in the interior of a vehicle such as an automobile usually include a plurality of blades straddled between opposing surfaces inside a cylindrical case member having a through hole as an air passage. A so-called fin duct, which is a resin product with a structure in which members are arranged, is attached. In such a fin duct, support shafts extending through the case member are integrally formed with both ends of each blade member, and
Each blade member is supported by these support shafts so as to be rotatable around one axis with respect to the case member, and the direction of air blowing from the air outlet can be changed based on the rotation operation. It looks like this.

By the way, fin ducts with such a structure have conventionally been manufactured by molding the case member and the blade member in separate processes, and then assembling the blade member to the case member. This manufacturing method requires a lot of manpower for the assembly process, resulting in high manufacturing costs and low mass productivity. In addition, in the fin duct thus obtained, the difference in dimension between the outer diameter of the support shaft formed in the blade member and the inner diameter of the through hole formed in the case member through which the support shaft is inserted is As a result, variations in the movement (rotation resistance) of the blade members tend to occur (and the quality of the product is unstable).

Therefore, in recent years, in order to deal with this problem, a mold rotating plate is attached to the movable platen side, and two sets of molds are supported on the mold rotating plate and the fixed platen, thereby making it possible to fix the fixed platen. A mold clamping device that can change the combination of a mold and a movable mold, and two injection devices that inject predetermined resin materials into the molding spaces formed in the two sets of molds. Using a so-called two-color injection molding machine,
A method of forming a fin duct having the structure described above has also been proposed.

In other words, in order to form a fin duct using such a two-color injection molding machine, a fixed mold is used that is fitted with a movable mold to define a molding space for forming a case member. One fixed mold and a second fixed mold that define a molding space for forming the blade member by being matched with the movable mold are used. First, a case member is formed by injecting and filling a predetermined resin material into a molding space formed by a first fixed mold and a movable mold using a first injection device, and then the mold is opened. The mold rotary plate is rotated with the case member attached to the movable mold to match the movable mold to the second fixed mold. As a result, a molding space for forming the blade member is formed inside the case member, and therefore, by injecting and filling the predetermined resin material into the molding space using the second injection device. At the same time that the blade member is formed, the blade member is assembled to the case member.

However, when forming a fin duct using such a two-color injection molding machine, the structure is complicated because the two-color injection molding machine itself is equipped with a mold rotating plate and its drive mechanism. In addition, two sets of molds are required, one for forming the molding space for the case member and the other for forming the molding space for the blade member, which reduces capital investment costs. There were major problems in implementation, such as bulkiness and troublesome maintenance.

(Problem to be solved) Here, the present invention has been made against the background of the above-mentioned circumstances, and the problem to be solved is:
It is an object of the present invention to provide an injection molding machine with a simple structure that can easily and inexpensively manufacture a resin product consisting of a case member such as a fin duct and a blade member.

(Solution Means) In order to solve this problem, in the present invention, at least one blade member is disposed inside the cylindrical case member, spanning between the opposing surfaces thereof, and the blade member A pair of support shafts extending through the case member are integrally provided at both ends of the member, and these support shafts support the blade member so as to be rotatable about one axis with respect to the case member. An injection molding machine for manufacturing resin products consisting of (a) a mold clamping device comprising a fixed plate and a movable plate that is moved toward and away from the fixed plate, and (b)
A first molding space for forming the case member and a second molding space for forming the blade member are respectively attached to the fixed platen and the movable platen in the linear mold clamping device and molded together. a mold forming a molding space therein, and a mold that is insertable into the (3g mold) and the support in the second molding space by being inserted into the mold. (d) supplying a first resin material to the first molding space formed in the mold into which the core rod is inserted; supplying a second resin material to the first injection device that forms the case member; and (e) the second molding space formed in the mold from which the core rod is taken out;
The present invention is characterized by an injection molding machine including a second injection device for forming the blade member.

(Operations/Effects) That is, in the injection molding machine configured according to the present invention, in the mold, there are a first molding space for forming the case member and a first molding space for forming the blade member. The second molding space is formed in a communicating state at the part forming the support shaft of the blade member, and by inserting the core rod into the mold, the core rod is connected to the support shaft. By being located at the forming site, the first forming space is made independent from the second forming space. Therefore, the case member can be formed by injecting and filling the first molding space with the first resin material while the core rod is inserted. A through hole through which the support shaft of the blade member is inserted can be formed in the wall of the case member. After the case member is formed, the core rod is removed from the mold to form a second molding space.
By injecting and filling the second resin material into the second molding space, the blade member can be formed, and at the same time as forming the blade member,
The support shaft is inserted into the through hole of the case member and assembled.

Therefore, according to the injection molding machine having the structure according to the present invention, there is no need for the troublesome work of assembling the blade member to the case member. It can be manufactured with high mass productivity, and stability of product quality can also be advantageously achieved.

Furthermore, in such an injection molding machine, a molding space for the case member and a molding space for the blade member are formed integrally inside a set of molds, and the mold is closed and opened at -degrees. Since the desired resin product can be formed using a cycle of operation, the structure is extremely simple and easy to maintain compared to conventional two-color injection molding machines.
It also has the advantage of requiring less capital investment and making it easier to manufacture resin products.

(Examples) Hereinafter, in order to clarify the present invention more specifically, examples of the present invention will be described in detail with reference to the drawings.

First, FIG. 1 shows an overall schematic diagram of an injection molding machine constructed according to the present invention, and FIGS.
The figure shows a vehicle fin duct 10 as a resin product manufactured by such an injection molding machine.

That is, the fin duct 10 manufactured by the injection molding machine of this embodiment has two through holes 12 as air passages extending parallel to each other, as shown in FIGS. 2 and 3.
, 12 are provided inside, and five blade members 16 are arranged in parallel in each through hole 12 in the case member 14. It is said that the structure is as follows. A pair of support shafts 18 are provided at both ends of each of the blade members 16 and extend through through holes 17, 17 provided in the case member 14.
18 are integrally formed, and these support shafts 18.
18, the blade member 16 is attached to the case member so as to be rotatable about the -axis. Although not shown, each through hole 12 is usually
The five blade members 16 arranged inside are connected to each other by links or the like, so that they can be rotated integrally so as to always move in the same direction.

The injection molding machine for manufacturing the fin duct 10 having such a structure is equipped with molds 20 and 22, as shown in FIG.
．． a mold clamping device 24 for closing and opening the mold 22;
A first injection device 26 and a second injection device 28 supply predetermined resin materials to the molding spaces formed in the molds 20 and 22 attached to the mold clamping device 24, respectively.
It is composed of:

More specifically, the mold clamping device 24 includes a fixed platen 30 and an end plate 32 fixedly mounted on a base 29 while facing each other at a predetermined distance. Four tie bars 34 are installed across the space between the plate 32 and the plate 32. In addition, the four tie bars 3
A movable platen 36 is movably supported by 4,
It can be moved between the fixed platen 30 and the end plate 32.

Further, a mold clamping cylinder 38 is attached to the end plate 32 on the opposite side to the side facing the fixed platen 30, and a ram 40 of the mold clamping cylinder 38 is connected to the movable platen 36. As a result, the movable platen 36 is moved closer to and separated from the fixed platen 30 by the mold clamping cylinder 38, and mold clamping force or pressure force can be applied to the movable platen 36. It has become.

The fixed mold 20 and the movable mold 22 are respectively mounted on opposing surfaces of the fixed plate 30 and the movable plate 36 in the mold clamping device 24, and the movable plate 36 is clamped by the mold clamping cylinder 38. As the molds 20 and 22 move, they are closed, opened, or clamped.

By the way, when these fixed mold 20 and movable mold 22 are matched, as shown in FIG.
A substantially rectangular cylindrical first molding space 42 for forming the case member 14 is formed extending in the mold matching direction, and the blade member 16 is formed between the mold matching surfaces 48. A substantially plate-shaped second molding space 44 for forming
Multiple pieces are formed. The first molding space 42 and the second molding space 44 are defined as a portion of the case member 14 in which the through hole 17 is formed in the first molding space 42 and a blade member in the second molding space 44. I6
They communicate with each other at the support shaft 18 formation site, and are configured as one continuous space.

Further, in the fixed mold 20, a first runner 46 for supplying resin material to the first molding space 42 is formed with an opening on the fixed platen 30 side. A No. 20 runner 47 for supplying resin material to the second molding space 44 is formed with an upward opening between the mold mating surfaces 48 of the movable mold 22 and the movable mold 22.

Furthermore, between the mold matching surfaces 48 of the fixed mold 20 and the movable mold 22, the blade members 16 are located below the second molding space 44, respectively. Rod installation holes 50 are formed that extend on an extension line of the support shaft 18 forming portion, and rod members 52 are installed in these rod installation holes 50, respectively.

These rod members 52 are inserted into the mold 2022 by being driven by a hydraulic cylinder 56 attached to the head 29 of the mold clamping device 24.
It is said that it can be taken out. Although not clearly shown in the open view, the plurality of rod members 52 are connected to each other and can be driven integrally by a hydraulic cylinder 56.

Each of the rod members 52 is provided with a core rond portion 54 of a predetermined length having a circular cross section at its distal end portion, and when inserted into the mold 20, a fifth core portion 54 is provided.
As shown in the figure, the core rod portion 54 is inserted into the second molding space 44 and the second molding space 44 is inserted into the second molding space 44.
The support shafts 18, 18 of the vane member 16 are formed within the blade members 16, respectively.

That is, by inserting the rod member 52 into the molds 20, 22, the core rod portion 54 is fitted into the communication portion between the first molding space 42 and the second molding space 44, and The second molding space 42 is made independent from the second molding space 44.

Further, the first injection device 26 is disposed so as to face the mold clamping device 24 to which the molds 20 and 22 are attached, facing the outer surface of the fixed platen 3o. .

The first injection device 26 has a structure used in normal injection molding, and as is well known, it includes a heating cylinder 60 with a screw inside and an injection cylinder 62. The first resin material supplied from the hopper 64 is plasticized in the heating cylinder 60 under the compression action of the screw, and is injected from the nozzle portion 66 at the tip thereof. In addition, this first injection device 26 is moved toward and away from the mold clamping device 24 in the horizontal direction by a drive means (not shown) while being guided by a guide rail 58 laid on the base 29. It's like being forced to do something.

That is, when the first injection device 26 is moved toward the mold clamping device 24, the heating tube 60 penetrates the fixed platen 30, and the nozzle portion 66 is inserted into the fixed mold 20. The sprue bushing for guiding the resin material is brought into contact with the first molding space 42 formed by the molds 20 and 22. The structure is such that the first resin material can be injected into 42.

Furthermore, the above-mentioned mold clamping device 24 has the second injection device 28 positioned above the fixed mold 20 attached to the fixed plate 30 by being supported by the fixed plate 30. is installed.

The second injection device 28 also has a structure used in normal injection molding, and as is well known, it includes a heating cylinder 68 with a screw inside and an injection cylinder 70. A second resin material supplied from a hopper (not shown) is plasticized in the heating cylinder 68 under the compression action of the screw, and is injected from a nozzle portion 72 at the tip thereof. Further, this first injection device 28 is guided by a plurality of guide bars 74 that are fixedly erected with respect to the fixed platen 30 of the mold clamping device 24, and is driven by the mold clamping device 28 by a drive means (not shown). It can be moved toward and away from the device 24 in the vertical direction.

In the second injection device 28, by being moved toward the mold clamping device 24 side, the nozzle portion 72 is provided between the mold matching surfaces of the fixed mold 20 and the movable mold 22. In addition, the second molding space 44 formed by the molds 20 and 22 is brought into contact with a sprue bush for guiding the resin material to the second molding space 44. The structure is such that the second resin material can be injected therein.

By the way, when forming the above-described fin duct 1o using an injection molding machine having such a structure, its operation is performed as follows. First, the fixed mold 20 and the movable mold 22 are mounted on the fixed plate 3o and the movable plate 36 of the mold clamping device 24, and then the movable plate 36
are moved to the fixed platen 30 side, and both molds 20.2
By closing the mold 2, first and second molding spaces 42.44 are formed within the mold 20.22.

Next, the rod member 52 arranged in the rod installation hole 50 formed between the two molds 20 and 22 is driven by the hydraulic cylinder 56 and inserted into the mold.
The core rod portion 54 of the rod member 52 is inserted into the second molding space 44 to make the first molding space 42 independent from the second molding space 44 .

Thereafter, the first injection device 26 is moved to the mold clamping device 24 side, and with the nozzle touching the mold 20, as shown in FIG. , the first resin material 76 is injected and filled into the first molding space 42 . That is, the case member 14 can be injection molded by such an injection operation, and in the case member 14 formed in this way, the through holes 17 are formed at the insertion portions of the core rod portions 54. This is what happens.

After molding the case member 14, the rod member 5
2 is driven by the hydraulic cylinder 56 and taken out from the second molding space 44 formed in the mold to expose the second molding space 44.

After that, the second injection device 28 is moved to the mold clamping device 24 side, and with the nozzle touching the molds 20 and 22,
As shown in FIG. 7, in the second injection device 28, a second resin material 78 is injected into the second molding space 44.
injection filling.

That is, the blade member 16 can be injection molded by such an injection operation, and the blade member 16 formed in this manner has the support shaft 18 simultaneously formed.
is inserted into the through hole 17 of the case member 14 and assembled integrally.

Note that the first injection device 26 fills the first molding space 42 with the first resin material 76 for forming the case member 14, and the second injection device 28 fills the first resin material 76 with the second molding material 76. The material of the second resin material 78 for forming the blade member 16, which is filled in the space 44, is not particularly limited; Fixation to the case member 14 can be prevented, and
An appropriate combination should be set in consideration of imparting appropriate rotational properties (rotation resistance) to the blade member 16. For example, the first resin material 76 may be ABS (
When acrylonitrile-butadiene-styrene copolymer) resin is used, the second resin material is PP(
Polypropylene) resin is preferably used.

Then, the case member 14 and the blade member 16 formed in this way are molded into the molds 20 and 22 according to a normal operation.
After the mold is opened, it is taken out from the mold by an eject means (not shown), and the runner portion is then cut off to obtain the intended fin duct 10.

Therefore, according to the injection molding machine structured as described above,
Since the blade member 16 can be assembled to the case member 14 at the same time as molding, and troublesome assembly work to the case member 14 is not required, the desired fin duct IO can be easily produced with excellent mass productivity. It can be manufactured using

Further, according to this injection molding machine, since the support shaft 18 of the blade member 16 is molded within the through hole 17 formed in the case member 14, the support shaft 18 is formed in the through hole 17.
The blade member 16 can advantageously be formed with a shape that faithfully corresponds to the shape of the blade member 16, thereby making the rotational performance (rotation resistance) of the blade member 16 uniform and advantageously stabilizing the quality of the product. be.

Furthermore, in such an injection molding machine, the case member 1
The first molding space 42 and the blade member I6 for forming the blade member I6.
A second molding space 44 for forming a mold is formed using a set of molds 22 and 24 integrally formed inside, and a cycle of mold closing and mold opening operations is performed to achieve the desired purpose. Since the fin duct 10 can be formed, the structure is extremely simple and maintenance is easy compared to conventional two-color injection molding machines.

Therefore, if such an injection molding machine is used, the capital investment cost for manufacturing the fin duct 10 can be reduced, and it also has the advantage that it can be easily carried out.

Although the embodiments of the present invention have been described in detail above, these are literal illustrations, and the present invention is not to be construed as being limited only to these specific examples.

For example, the mold clamping device and the second and second injection devices applied to the present invention may be of any conventionally known structure, and are not limited to those illustrated.

Furthermore, the arrangement positions of the first and second injection devices relative to the mold clamping device are not limited to those shown in the example, and can be changed as appropriate by changing the shape of the runner formed in the mold. be.

Further, the direction in which the core rod is inserted into the mold is not limited to the illustrated example, but may be changed as appropriate depending on the position of the support portion in the blade member.

In addition, in the above embodiment, a specific example was shown in which the present invention was applied to an injection molding machine used for manufacturing a fin duct installed in a cooling/heating air outlet in a vehicle interior.
It goes without saying that the present invention can be widely applied to injection molding machines used to manufacture various resin products in which a blade member is rotatably attached to a case member.

In addition, although not listed, the present invention can be implemented in embodiments with various changes, modifications, improvements, etc. based on the knowledge of those skilled in the art, and such embodiments may be different from the present invention. It goes without saying that any of these are included within the scope of the present invention as long as they do not depart from the gist of the invention.

[Brief explanation of drawings]

FIG. 1 is a side view schematically showing an injection molding machine constructed according to the present invention. Moreover, FIG. 2 is a perspective view showing the fin duct manufactured by the injection molding machine shown in FIG. 1, and FIG. 3 is a sectional view taken along the line 2--2 in the second section. Moreover, FIG. 4 is an explanatory cross-sectional view showing an enlarged view of the main parts of the injection molding machine shown in FIG. , is a cross-sectional explanatory diagram. Moreover, FIGS. 6 and 7 are enlarged sectional views of essential parts for explaining the molding operation using the injection molding machine shown in FIG. 1, respectively. 10: Fin duct 14: Case member 16: Blade member 18: Support shaft 20: Fixed mold 22: Movable mold 24: Mold clamping device 26: First injection device 28: Second injection device
30: Fixed plate 36: Movable plate 44: Second molding space 54: Core rod portion 78: Second resin material 42: First molding space 52: Rod member 76: First resin material

Claims (1)

[Claims] At least one blade member is disposed inside the cylindrical case member, spanning between opposing surfaces thereof, and a pair of blade members extending through the case member are provided at both ends of the blade member. An injection molding machine that manufactures a resin product in which support shafts are integrally provided and the blade members are supported rotatably about one axis relative to the case member by these support shafts, the fixed platen and a movable platen that can be moved toward and away from the fixed platen, and a mold clamping device that is attached to the fixed platen and the movable platen of the mold clamping device, respectively, and the molds are matched. A mold for forming a first molding space for forming the case member and a second molding space for forming the blade member, respectively, and insertable into the mold. a core rod that is inserted into the mold and thereby positioned at the formation site of the support shaft in the second molding space; and a core rod formed in the mold into which the core rod is inserted. a first injection device for forming the case member by supplying a first resin material to the first molding space in which the core rod is taken out; An injection molding machine comprising: a second injection device that supplies a second resin material to a second molding space to form the wing member.