JPH0737035B2 - Method for molding door for air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Industrial field of application) The present invention relates to a method for molding a door provided in an air flow passage constituting an air conditioner for an automobile.

(Prior Art) Inside an air flow passage of an air conditioner for a vehicle, a mix door for adjusting the amount of air flowing into a heater core, a differential door for closing each air outlet opening in the air flow passage, a vent door and a foot door. However, since each of these doors is required to have high airtightness, for example, as shown in Japanese Utility Model Publication No. 60-96107, a foam made of a rubber material is used. The packing is stuck on the surface.

This packing is attached to a door made of resin through the steps shown in FIG.
The door has the desired airtightness. The manufacturing process of this door will be described below with reference to FIG.

First, a predetermined resin material is poured into a mold to form the door body 10 (S1). Next, the rubber in which the foamed material has been injected is placed in a heating furnace and heated to foam it to form foamed rubber 2 (S2). This foamed rubber is sliced into a preferable thickness as packing (S3), and the sliced packing 3 The double-sided tape 4 is attached to one side of the (S4), the packing 3 is sliced again into a predetermined width, and a notch K is made so that it can be easily bent (S5).
Sticking along the end of 10 (S6), the door for the air conditioner for automobiles is formed.

(Problems to be Solved by the Invention) However, in such a conventional door forming method, many steps are required until the packing 5 is attached to the door body 10, which naturally leads to a manufacturing cost. Since the number of steps is large, the cost is high. Further, in the processed surface, if dust or the like adheres to the adhesive surface of the double-sided tape 4, the adhesive force is reduced.
Not only is it important to manage dust adhesion on the surface of the double-sided tape, but it is also possible that the adhesive strength of the double-sided tape 4 deteriorates with age. Further, depending on the cutting accuracy of the packing 5, there are many uncertain factors such as having a great influence on the airtightness, and there are many problems such as the difficulty of managing these.

An object of the present invention is to solve the above-mentioned conventional problems, and a foaming rubber is applied to a packing forming portion of a door body, and the applied rubber is inserted into a high frequency electric field. By forming the packing by foaming by doing so, it is an object of the present invention to provide a method for forming a door for an air conditioner, which is inexpensive and has extremely high airtightness and reliability.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above-mentioned object, in the present invention, one end of a flat plate is
A rotary member that serves as a rotation axis of the flat plate is formed, and a predetermined number of holes are formed in at least one end of the flat plate.
The flat plate was housed in a mold made of a material with extremely low dielectric loss and having a mold hole for closely forming a packing on the surface of the flat plate, and a foaming rubber material with large dielectric loss was injected into this mold hole. It is to be inserted into a rear high frequency electric field for a predetermined time, and a foaming packing is closely formed on a predetermined surface of the flat plate.

(Operation) When the door is formed as described above, the step of slicing the foamed rubber, the step of attaching the double-sided tape to the sliced foamed rubber (packing), and the packing having a predetermined width as in the conventional case The step of slicing and the step of making a notch in this packing are unnecessary, and the number of steps for molding the door can be reduced. Further, since this packing can be integrally formed in close contact with the door body instead of being attached to the door body, there is no risk of peeling due to secular change of the packing. Further, since the sealing surface can be machined with high precision, it is possible to form a door for an air conditioner having an extremely high airtightness and reliability while significantly reducing the processing cost.

(Example) Hereinafter, the Example of this invention is described in detail based on drawing.

FIG. 1 shows a process diagram of a method for forming a door for an air conditioner according to the present invention.

According to the door forming method of the present invention, in the first step, resin is injected into the door molding die, the flat plate 1 has the rotating member 1a at one end, and a predetermined number of ends are provided at the end thereof. A door body 10 having holes 6 is formed (S1).

Next, the door body 10 is provided with an injection port 11 for injecting a foamable rubber (for example, chloroprene rubber [CR] or ethylene propylene diene terpolymer [EPDM] belonging to ethylene propylene rubber) which is a material of the packing 7. It is stored in the mold 9 that is provided with the upper mold and the lower mold (S2). The mold 9 is preferably made of a hard material such as polyimide having a small dielectric loss.

Then, a foaming rubber (rubber compound) injector 12 is set in the injection port 11, and the foaming rubber is injected into the mold cavity 8 (S3).

The mold 9 in which the foamable rubber is injected is set in an oven that generates a high frequency electric field, and is exposed to the high frequency electric field at a predetermined frequency for a predetermined time while applying a predetermined pressure to the mold 9 (dielectric heating). In this way, the injected foam rubber will
It will self-heat and foam (S4). in this way,
Since only the foamable rubber must be heated in the high frequency electric field, the constituent material of the door body 1 and the constituent material of the mold 9 have a small dielectric loss, that is, they are hard to be heated even in the high frequency electric field. It goes without saying that a resin material is selected. Further, the frequency of this high-frequency electric field, the strength of the electric field, the irradiation time, etc. are appropriately determined according to the characteristics of the foaming rubber to be injected.

The door 10 thus formed is shown in FIG. The door 10 shown in the figure is formed by an upper mold having a sectional shape as shown in FIG. The cross-sectional view shown in FIG. 3 is a cross-sectional view taken along the line AA of FIG. 1 and is a cross-sectional view in a state where the door body 10 is stored.

A foam rubber 13 is introduced into the injection port 11 of the mold 9 shown in FIG.
Then, the foamable rubber 13 spreads evenly in the mold cavity 8. In this state, the mold 9 is inserted into the high frequency electric field for a predetermined time, and then the mold 9 is removed to form the foamable rubber formed on the flat plate 1. If the packing 7 of the
A packing 7 having a shape as shown in the figure is formed, and the packing 7 has holes 6 formed at various places in the door body 10.
Since it comes in and is fixed in close contact, there is no risk of peeling due to aging, etc. Also, since only the precision of flat surface processing is a factor affecting the airtightness of packing 7, if only this processing accuracy is managed, The airtightness of the packing 7 can be sufficiently ensured.

Further, in this embodiment, the packing 7 has a flat sealing surface, but by changing the shape of the die hole 8 variously, it is possible to match various members to be sealed with which the packing 7 comes into contact. A packing having a shape can be easily formed, and airtightness can be maintained even for a member to be sealed having a complicated shape. If the shape of the member to be sealed is not so complicated, when deburring the packing 7 that has entered the inlet 11, even if the sealing surface of the packing 7 is processed so as to match the shape of the member to be sealed. good. Further, the packing 7 can be formed on the entire surface of the flat plate 1, a part thereof, or both surfaces thereof. The elasticity and the like of the packing can be changed to some extent depending on the type of rubber to be injected, the heating conditions during dielectric heating, and the like.

In this embodiment, in the process of foaming the rubber material,
Although only dielectric heating is used, dielectric heating may be used in the initial stage of foaming, and thereafter heating may be performed in a normal heating furnace.

[Effects of the Invention] As is clear from the above description, in the present invention, a rotating member that serves as a rotation axis of the flat plate is formed at one end of the flat plate, and at least one end of the flat plate is provided with a predetermined number. A hole is opened, and this flat plate is housed in a mold having a die hole made of a material with extremely low dielectric loss to closely form a packing on the surface of the flat plate. After injecting the rubber material, the rubber material was inserted into the high frequency electric field for a predetermined time, and the foaming packing was closely formed on the predetermined surface of the flat plate, so that the steps required for molding the door were significantly reduced. Since it is formed in close contact with the door, the sealing surface can be easily processed, the airtightness can be improved regardless of the shape of the member to be sealed, and the elasticity of the packing can be changed within a certain range. so Therefore, it is possible to form a packing that matches the usage conditions.

[Brief description of drawings]

FIG. 1 is a process drawing of a method for forming an air conditioner door according to the present invention, FIG. 2 is a perspective view of a door formed by the forming method of the present invention, and FIG. 3 is a forming method of the present invention. FIG. 4 is a diagram showing an example of a packing forming mold used in FIG. 4, and FIG. 4 is a process diagram of a conventional method for forming an air conditioner door. 1 ... Flat plate, 1a ... Rotating member, 2 ... Foam rubber, 3 ... Packing, 4 ... Double-sided tape, 5 ... Processed packing, 6 ...
Hole, 7 ... Packing, 8 ... Mold hole, 9 ... Mold, 10 ... Door body,
11 ... inlet, 12 ... injector.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location B29K 105: 04 B29L 31:30

Claims (1)

[Claims] 1. A flat plate (1) is provided with a rotary member (1a) as an axis of rotation of the flat plate (1) at one end thereof, and at least one end of the flat plate (1) has a predetermined number of holes. (6) is opened, and the flat plate (1) is made of a material with extremely low dielectric loss and has a die (9) having a die hole (8) for closely forming a packing (7) on the surface of the flat plate (1). ), A foaming rubber material having a large dielectric loss is injected into the mold cavity (8), and then inserted into a high frequency electric field for a predetermined time to form a foaming packing (on the predetermined surface of the flat plate (1) ( 7) A method for forming a door for an air conditioner, which is configured so as to closely adhere.