JPH03247419A - Molding method for duct - Google Patents

Abstract

PURPOSE:To form the partition wall of a duct at low cost by dividing an inner mold in the axial direction of the branched duct and changing over the pressure of a gap for forming the partition wall by moving one part to the other. CONSTITUTION:An inner mold 6 is divided into a first inner mold 6a and a second inner mold 6b. Furthermore presence of a gap 7a for forming a partition wall 2a is changed over by slidingly moving the first inner mold 6a e.g. to the second inner mold 6b. When the inner mold 6a is slid and moved as shown in an arrow X, and the gap 7a is eliminated, the inner molds 6a, 6b become the same shape as the inner mold 6 and a branched box 1 can be molded. When the first inner mold 6a is slid and moved as shown in an arrow Y and the gap 7a is formed and the molding material such as resin is introduced, this molding material is introduced into a gap 7 and this gap 7a, and the partition wall 2a can be formed in the branched connection part 10a of a branched box 1a.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for forming a branch box used for branching air ducts for ventilation and air conditioning in vehicles and the like into multiple directions.

[Prior art]

Air outlets for ventilation and air conditioning in a vehicle are normally provided at three locations: the left end, the right end, and the center of the instrument panel, but some vehicles of the same model have an outlet only in the center due to differences in specifications.

FIG. 3 shows an example of a branch box that branches air into three directions as described above. In order to have such a branch box 1 with only the outlet in the center, it is necessary to It was necessary to cover the branch connection part 10 with a hole cover 3 having a partition wall 2. Note that 11 is a connection part to the central outlet.

In order to mold the branch box 1, the branch box 1 is divided into upper and lower halves, each of which is molded separately, and then the upper and lower halves are integrated by gluing or the like. FIG. 4 shows a method for molding the upper part of the branch box 1. After injecting a molding material 8 such as resin into the gap 7 between the outer mold 5 and the inner mold 6, the outer mold 5 and the inner mold are The mold 6 is separated and the upper part of the branch box 1 is taken out, and the lower part of the branch box 1 (double-dashed line) is also molded in the same way.

[Problem to be solved by the invention]

In the conventional molding method for the duct 4 described above, the hole cover 3 having the partition wall 2 is molded as a separate part from the branch box 1, which increases the number of parts and requires more effort to attach it to the branch box 1, resulting in higher costs. was.

Therefore, it is an object of the present invention to provide a duct forming method that allows the partition walls of the duct to be formed at low cost.

[Means to solve the problem]

In order to achieve the above object, the present invention provides duct molding in which ducts with and without partition walls are formed in batches by injecting a molding material into the gap between an outer mold and an inner mold for talito molding. In the duct forming method, the inner mold is divided in the axial direction of the branch duct, and presence or absence of a gap for forming a partition wall is switched depending on whether or not one side is moved relative to the other. It is structured as a method.

[Examples] Hereinafter, examples embodying the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention.

In addition, the following example is an example embodying the present invention,
It is not intended to limit the technical scope of the present invention.

Here, FIG. 1 is a schematic cross-sectional view of an outer mold, etc. showing an example of a duct forming method according to an embodiment of the present invention, and FIG. 2 is a schematic cross-sectional view of a duct with a partition wall formed using the same duct forming method. It is a perspective view showing an example.

In addition, the same symbols are used for elements common to the conventional duct and duct forming method shown in FIGS. 3 and 4, and elements that are common to the same duct and duct forming method but have different functions are further indicated. Distinguish by adding a suffix.

The feature of the duct forming method according to this embodiment is that, as shown in FIG. and a second inner mold 6. Furthermore, for example, the partition wall 21 can be formed depending on whether or not the first inner mold 61 is slid relative to the second inner mold 6. The point is that the presence or absence of the gap 7□ can be switched.

That is, in this duct molding method, when the first inner mold 6 is slid in the direction indicated by the arrow X in FIG. 1 to eliminate the gap 71, the inner mold 6°6t becomes The inner mold 6 shown in FIG.

Further, the first inner mold 61 is slid as shown by the arrow Y to create a gap 7 as shown in FIG. When a molding material such as a resin is injected into the gap 7, the molding material is injected into the gap 7 as shown in FIG.
Branch connection part 10 of branch box 11 as shown in FIG.
A partition 9!2° can be formed in 1.

Note that the lower half of the branch box is molded in the same manner as before.

Therefore, in this duct forming method, a unidirectional blowout type duct having a partition wall 21 at the branch connection part 101 of the branch pond 11 as shown in FIG. 2 without using the conventional hole cover 3 (FIG. 3) 4. can be molded.

This reduces the number of parts! It is possible to realize reductions in II and assembly man-hours, leading to cost reductions.

Duct with the above-mentioned unidirectional blowout specification), 4. (branching box 11) and the branching box 1 with the three-way blowout specification are the partition wall 2. It can be immediately distinguished by the presence or absence of
Furthermore, in order to make it easier to identify the branch box 1.1□, when the first inner mold 63 is slid as shown at Y in FIG. A gap 7t is formed in the gap 7b, and the molding material is injected into the gap 7b to form the branch connection part 101 as shown in FIGS. 1 and 2.
A rib 12 protruding outward may be formed at the tip end.

In this way, not only can the branch box 1.1□ be distinguished at a glance, but also the branch connection portion 10.1 on which the rib 12 is formed. Since a branch duct (not shown) is not fitted into the duct, identification can be made even more reliable.

Furthermore, the partition wall may be provided in the lower part of the bisected branch box 11, or may be provided in half in the upper part and in the lower part.

〔Effect of the invention〕

According to the present invention, in a duct forming method in which a molding material is injected into the gap between an outer mold and an inner mold for duct molding to form a duct with and without a partition wall in a punch-like manner, the inner mold is used to form a branch duct. There is provided a duct forming method characterized in that the duct is divided in the axial direction and the gap for forming the partition wall is switched between no gap and no gap depending on whether one side is moved relative to the other.

Therefore, the partition wall of the duct can be formed at low cost.

[Brief explanation of drawings]

FIG. 1 is a schematic cross-sectional view of an outer mold, etc. showing an example of a duct forming method according to an embodiment of the present invention, and FIG. 2 is an example of a duct with a partition wall formed using the same duct forming method. Figure 3 is a perspective view showing an example of a conventional duct; Figure 4 is a perspective view showing an example of a conventional duct;
The figure is a schematic longitudinal cross-sectional view of an outer mold, etc., showing an example of a method of molding the duct. [Explanation of symbols] 111... Branch box 2□... Partition wall 5... Outer mold 61... First inner mold 6b... Second inner mold 7.1&, 7t,... Gap 8...Resin (molding material)

Claims (1)

[Claims] 1. In a duct molding method in which a duct with and without a partition wall is formed in batches by injecting a molding material into the gap between an outer mold and an inner mold for duct molding, the above-mentioned A duct forming method characterized in that a mold is divided in the axial direction of a branch duct, and presence or absence of a gap for forming a partition wall is switched depending on whether one mold is moved relative to the other.