JP2008188958A - Manufacturing method of molded wire harness - Google Patents

Abstract

The present invention provides a method for manufacturing a molded wire harness in which the thickness of an exterior member is substantially uniform.
In a first step using a primary molding die 8, resin molding is performed in which a primary molding convex portion 10 is provided on the outside of a wire bundle 3 set inside the primary molding die 8. On the outside of the wire bundle 3, the primary molded portion 4 including the primary molded convex portion 10 is resin-molded to obtain a primary molded product 6. Then, after the resin molding of the primary molded product 6 in the primary molding die 8 is completed, the primary molded product 6 is taken out from the primary molding die 8 and transferred into the secondary molding die 9. In the second step using the secondary molding die 9, the secondary molding portion 5 is provided outside the primary molded product 6 positioned inside the secondary molding die 9 due to the presence of the primary molding convex portion 10. Perform resin molding. Thereby, a secondary molded product to be the molded wire harness 1 is obtained, and when taken out from the secondary molding die 9, a series of manufacturing steps is completed.
[Selection] Figure 1

Description

  The present invention relates to a method for manufacturing a molded wire harness obtained by performing resin molding on the outside of one or a plurality of electric wire bundles.

For example, the following Patent Document 1 discloses a method for forming an exterior member on the outside of an electric wire bundle by performing resin molding after wiring the electric wire bundle inside the molding die. ing.
Japanese Patent Laid-Open No. 2004-6129

  Although not limited to the technology disclosed in Patent Document 1, when the resin bundle is simply molded in a state where the wire bundle is laid inside the molding die, as shown in FIG. A partially formed molded wire harness 53 may be manufactured. For example, in the case of FIG. 3, since the position of the wire bundle 51 is not in the center, it can be seen that the thickness of the exterior member 52 is partially different. The thin portion has a problem that performance such as wear resistance cannot be ensured.

  This invention is made | formed in view of the situation mentioned above, and makes it a subject to provide the manufacturing method of the shaping | molding wire harness which makes it possible to make the thickness of an exterior member substantially uniform.

  The method for manufacturing a molded wire harness of the present invention according to claim 1 made to solve the above-mentioned problem includes at least two steps using a primary molding die and a secondary molding die, and the primary molding die. In the first step using the resin, resin molding is performed by providing a primary molding convex portion on the outside of a wire bundle composed of one or a plurality of electric wires set inside the mold, and resin molding of the primary molded product in the primary molding die Is completed, the primary molded product is taken out from the primary molding die and transferred into the secondary molding die, and in the second step using the secondary molding die, the primary molding is performed. A secondary molded product that becomes a molded wire harness is obtained by performing resin molding in which a secondary molded portion is provided outside the primary molded product positioned in the mold due to the presence of the convex portion.

  According to the present invention having such a feature, the electric wire bundle is positioned at the center by dividing the molding twice. That is, when a primary molded product having a primary molding convex portion is resin-molded using the primary molding die, and then the primary molding convex portion contacts the mold inside the secondary molding die, the secondary molding die The position of the primary molded product is determined. If the secondary molding is performed in this positioned state and a secondary molding part is provided, a molded wire harness in which the thickness of the exterior member is substantially uniform can be obtained.

  The method for manufacturing a molded wire harness according to a second aspect of the present invention is the method for manufacturing a molded wire harness according to the first aspect, wherein the primary molded convex portion includes a plurality of protrusions provided in the longitudinal direction of the electric wire, or the longitudinal direction of the electric wire. It is characterized in that it is formed into a plurality of ridges extending in the direction.

  According to the present invention having such characteristics, protrusions and ridges are given as an example of better shapes of the primary molding convex portions that contact the secondary molding die. There is no need for the primary molding convex portion to be on the entire outer side of the electric wire bundle, and there is no problem even if the electric wire bundle is visible after forming the primary molded product. Since the outer shape of the molded wire harness can be the secondary molded part, the primary molded convex part has a shape that can position the wire bundle in the secondary molding die, that is, the thickness of the exterior member is substantially reduced. Any shape that is uniform may be used.

  According to the first aspect of the present invention, there is an effect that the thickness of the exterior member can be made substantially uniform. As a result, it is possible to sufficiently ensure performance such as wear resistance. According to the present invention, it is possible to provide a better method of manufacturing a molded wire harness.

  According to the second aspect of the present invention, there is an effect that a better shape of the primary molding convex portion can be provided.

  Hereinafter, description will be given with reference to the drawings. FIG. 1 is a diagram showing an embodiment of a method for producing a molded wire harness according to the present invention, where (a) is an explanatory view of a first step, (b) is a sectional view of a primary molded product, and (c) is a first view. Explanatory drawing of two processes, (d) is sectional drawing of a shaping | molding wire harness. FIG. 2 is a diagram showing another example of the primary molding convex portion, (a) is a perspective view of the primary molding convex portion of another example, and (b) is a cross-sectional view of the primary molding convex portion of another example. It is.

  In FIG. 1, reference numeral 1 indicates a molded wire harness of the present invention. The molded wire harness 1 is manufactured by performing resin molding to provide a primary molded portion 4 on the outer side of a wire bundle 3 composed of a plurality of electric wires 2, and further forming resin molding on the outer side to provide a secondary molded portion 5. It has come to be. As will be described later, the molded wire harness 1 becomes a primary molded product 6 in a state in which the primary molded portion 4 is provided outside the wire bundle 3, and the manufacture is completed by the second resin molding.

  The molded wire harness 1 is a kind of wire harness routed in a vehicle such as an automobile, for example, and the thickness of the exterior member 7 including the primary molded portion 4 and the secondary molded portion 5 is substantially uniform. It is manufactured. In the molded wire harness 1, the exterior member 7 is composed of the primary molded part 4 and the secondary molded part 5 so that the thickness of the exterior member 7 is substantially uniform, and performance such as wear resistance is sufficiently secured. It has become.

  In order to configure the exterior member 7 with the primary molding part 4 and the secondary molding part 5, a method of performing resin molding in two steps is employed. In the present invention, since the resin molding is performed twice, the primary molding die 8 and the secondary molding die 9 are used for manufacturing.

  What is important with respect to the exterior member 7 is not simply the primary molded part 4 and the secondary molded part 5, and it is important to provide the primary molded convex part 10 in the primary molded part 4. The primary molding convex part 10 is formed so that it may become a plurality of protrusions extending in the electric wire longitudinal direction or a plurality of protrusions provided in the electric wire longitudinal direction (see reference numeral 10 ′ in FIG. 2). Further, the primary molding convex portion 10 is formed in a shape such that the protruding tip contacts the inner surface of the secondary molding die 9 in a state where the wire bundle 3 is arranged at the center. Six primary molded convex portions 10 of this embodiment are formed at an equal pitch in a sectional view (assumed to be an example).

  The primary molding convex part 10 is an important part for positioning of the wire bundle 3. On the other hand, the secondary molding part 5 is a part contributing to control of the thickness of the exterior member 7.

  The primary molding die 8 has a two-part mold structure so that the wire bundle 3 can be wired therein. Further, the primary molding die 8 has a structure in which the primary molding convex portion 10 can be provided on the outer side of the wire bundle 3 in a state where the wire bundle 3 is arranged at the center. On the inner surface of the primary molding die 8, a plurality of concave portions 11 for providing the primary molding convex portions 10 are formed. In this embodiment, the gate for injecting the resin is set in the concave portion 11 at a predetermined position.

  In the primary molding die 8, the portion on the inner surface of the die other than the recess 11 is formed in a size that can suppress the variation of the wire bundle 3. When viewed from the cross section of the mold, the primary mold 8 is formed so that the wire bundle 3 is contained in a circle having a predetermined diameter.

  The secondary mold 9 has a split mold structure so that the primary molded product 6 can be set therein. Further, the secondary molding die 9 has a structure for providing a secondary molding portion 5 that can ensure the outer diameter and appearance necessary for the molded wire harness 1. In the drawing, at least the lower primary molding convex portion 10 is in contact with the inner surface of the secondary molding die 9 (in this embodiment, the upper primary molding convex portion 10 is not in contact and has a slight gap. This is because the primary molded product 6 slightly floats when the resin is injected (material injection), and the resin enters between the lower primary molding protrusion 10 and the inner surface of the mold. Because it is).

  Next, manufacture of the molded wire harness 1 will be described based on the above configuration.

  The molded wire harness 1 is manufactured including at least two steps using a primary molding die 8 and a secondary molding die 9.

  In the first step using the primary molding die 8, resin molding is performed in which the primary molding convex portions 10 are provided outside the wire bundle 3 set (wired) inside the primary molding die 8. On the outside of the wire bundle 3, the primary molded portion 4 including the primary molded convex portion 10 is resin-molded to obtain a primary molded product 6. Then, after the resin molding of the primary molded product 6 in the primary molding die 8 is completed, the primary molded product 6 is taken out from the primary molding die 8 and transferred into the secondary molding die 9.

  In the second step using the secondary molding die 9, the secondary molding portion 5 is provided outside the primary molded product 6 positioned inside the secondary molding die 9 due to the presence of the primary molding convex portion 10. Perform resin molding. Thereby, a secondary molded product to be the molded wire harness 1 is obtained, and when taken out from the secondary molding die 9, a series of manufacturing steps is completed.

  As described above, according to the present invention, the thickness of the exterior member 7 can be made substantially uniform. Thereby, performance such as wear resistance can be sufficiently secured.

  In addition, it goes without saying that the present invention can be variously modified without departing from the spirit of the present invention.

It is a figure which shows one Embodiment of the manufacturing method of the shaping | molding wire harness of this invention, (a) is explanatory drawing of a 1st process, (b) is sectional drawing of a primary molded product, (c) is a 2nd process. Explanatory drawing, (d) is sectional drawing of a forming wire harness. It is a figure which shows the other example of a primary shaping | molding convex part, (a) is a perspective view of the primary shaping | molding convex part of another example, (b) is sectional drawing of the primary shaping | molding convex part of another example. It is sectional drawing of the shaping | molding wire harness of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Molding wire harness 2 Electric wire 3 Wire bundle 4 Primary molding part 5 Secondary molding part 6 Primary molded product 7 Exterior member 8 Primary molding die 9 Secondary molding die 10, 10 'Primary molding convex part 11 Concave part

Claims (2)

Including at least two steps of using a primary molding die and a secondary molding die, and in the first step of using the primary molding die, the outer side of the wire bundle composed of one or a plurality of electric wires set inside the die After the resin molding of the primary molding with the primary molding die is completed, the primary molding product is taken out from the primary molding die and the secondary molding die is removed. In the second step using the secondary molding die, the secondary molding part is placed outside the primary molded product positioned in the mold due to the presence of the primary molding convex part. A method for producing a molded wire harness, comprising: obtaining a secondary molded product to be a molded wire harness by performing resin molding to be provided. In the manufacturing method of the shaping | molding wire harness of Claim 1,
The said primary shaping | molding convex part is shape | molded so that it may become several protrusion provided in the electric wire longitudinal direction, or several protrusion extended in the said electric wire longitudinal direction. The manufacturing method of the shaping | molding wire harness characterized by the above-mentioned.

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