JP2816874B2 - Injection molding of brackets for focusing and fixing of small diameter piping - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to an injection molding method of a bracket for fixing and converging piping when performing concentrated piping of a thin metal tube or resin tube (hereinafter referred to as piping). Things.

(Prior Art) Conventionally, most of such small-diameter pipes use metal thin-diameter pipes. However, as a method for obtaining a focusing fixed body for centrally piping such small-diameter metal pipes, It is performed by setting a plurality of small metal tubes in parallel on a jig and directly brazing the adjacent metal tubes to each other or brazing them with an appropriate mounting bracket. . In order to sandwich a plurality of parallel metal tubes, a method of fixing a metal tube with a mounting piece that hinges one end of two substantially symmetric members made of resin and supports the other end of the member is widely used. I was

(Problems to be Solved by the Invention) However, in recent years, there has been an increasing tendency to adopt a resin tube made of an appropriate synthetic resin as a small-diameter tube due to a demand for weight reduction. In the method, some results have been obtained when the pipe is formed of a metal pipe, but when the pipe is a resin tube, the former method cannot be adopted at all, and the latter method cannot be used. If the resin tubes to be focused must be arranged in a plane and the resin tubes must be arranged three-dimensionally due to the mounting location, a plurality of mounting pieces must be prepared. The fixing of the mounting piece to the substrate is not only time-consuming but also economical, and the mounting operation in a narrow space is difficult and impractical.

The present invention solves the above-described problems in performing convergence and fixing of small-diameter pipes by injection molding using a split mold,
It is an object of the present invention to provide a method for easily forming a bracket and fixing a small-diameter pipe by injection molding without significantly complicating a mold structure, even for a pipe arranged three-dimensionally. is there.

(Means for Solving the Problems) That is, according to the present invention, a pipe is inserted into a split mold having a cavity so that a bracket having a desired shape can be obtained.
When molding the bracket and fixing the resin tube by injecting the molten resin into the mold, an opening is formed by notching a part of two opposing side walls of the split mold. A plate is installed so as to close this, a resin tube is inserted through the plate, and injection molding of the resin into the mold is performed. In the case of the present invention, the small diameter pipe is divided. Since the pipe is inserted through the plate arranged in the notch opening provided in the mold and the injection molding of the bracket with the molten resin is performed, when removing the bracket molded by this from the mold, The whole plate is taken out with the pipe inserted regardless of the mold dividing line.Therefore, it is not always necessary to arrange the pipe on a plane along the dividing line. It is possible to secure by arranging the body condition.

(Operation) The details and operation of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a perspective view of a pipe insertion plate installed in a mold when obtaining a bracket for fixing and focusing a small diameter pipe according to the present invention, and FIG. 2 is a diagram illustrating the pipe insertion plate of FIG. 1 installed in a mold. Partial sectional open slope view of the main part of the mold showing the situation,
FIG. 3 is a perspective view showing an appearance of a molded product of a pipe focusing and fixing bracket obtained by the present invention, and FIG. 4 is a sectional view showing a partial section of an insertion hole in a plate.

In the figure, reference numeral 1 denotes a small-diameter pipe for forming a flow path for fluids having different diameters or the same for oil supply, air supply, and the like.

A mold 2 is divided into two by a dividing line 2 '. A cavity 2 is formed in the mold 2 so that a bracket 3 having a desired shape is formed by injection molding. Openings 5, 5 'are formed by cutting out predetermined portions of two opposing wall surfaces. It is.

Reference numerals 6 and 6 'denote two plates disposed so as to close the openings 5, 5', respectively. The plates 6, 6 'are provided with insertion holes 7, 7' for inserting the pipes 1 arranged for focusing and fixing.

When the injection pressure is extremely high, when the opening area is large, or when the thickness of the plates 6, 6 'is small, a projecting portion serving as a reinforcing beam can be provided substantially at the center of the opening. (See FIG. 1).

The mold 2 is provided with an injection port (not shown) for injecting the molten resin into the cavity 4 and a cooling water passage 9, and the resin injected and filled into the cavity 4 from the injection port. Are formed so as to be rapidly cooled and solidified in the cavity 4.

In the present invention, when focusing and fixing the small-diameter pipe 1, the insertion holes 7 and 7 ′ are arranged at positions where the pipes 1 to be focused and fixed have a predetermined three-dimensional arrangement as shown in FIG. The two plates 6, 6 'are opposed to each other so that the distance between the two plates is such that the openings 5, 5' of the mold 2 can be closed, and the insertion holes 7, 7 'are formed. The pipe 1 is inserted between the more opposing plates 6 and 6 ', and is clamped and fixed between the opposing plates 6 and 6'. Thereafter, as shown in FIG. 2, the plate is set in the mold 2 so that the plate closes the openings 5, 5 'of the mold 2, and the resin heated and melted from the injection port is filled in the cavity of the mold 2. The molten resin injected into the mold 2 is cooled and solidified by supplying the cooling water to the cooling water passage 9 while injecting the molten resin into the cavity 4. When doing so, the resin is placed on the opposite plate 6,
The bracket 3 in a state in which the pipe 1 is cast-fixed as shown in FIG. It is obtained in an integrated state.

In addition, as shown in FIG. 4, when the small projections 8 and 8 'directed inward so as to be in sliding contact with the pipe 1 inserted into the insertion holes 7 and 7' provided in the plates 6 and 6 ', This is preferable from the viewpoint of preventing the molten resin from protruding outside the plate during injection molding.

As shown in FIG. 3, the bracket 3 integrally molded with the pipe 1 and the plate is taken out of the mold 2 with the plates 6 and 6 'still attached thereto, and the bracket is fixed and bundled as it is. The pipes can be used for centralized pipes or the like, or the plates 6, 6 'can be pulled out of the pipes 1 after being taken out, so that they can be used separately from the bracket 3. In this case, it is necessary to apply a sufficient mold release agent to the inner surface of the plates 6, 6 ', that is, the portion facing the injection resin when installing the plates 6, 6' in the mold. The plates 6, 6 'after being separated from the bracket 3 can be used repeatedly in the next injection molding.

As described above, the injection molding of the small-diameter pipe fixing bracket 3 according to the present invention is performed by inserting and holding the pipe through a plate arranged so as to close the opening in the wall face of the mold facing each other. , Obtained bracket 3
Can be taken out of the mold 2 regardless of the arrangement of the dividing lines 2 'in the mold 2 regardless of the arrangement of the pipes 1. Therefore, various three-dimensional arrangements can be adopted for fixing and fixing the pipes. And thus the degree of freedom of the arrangement can be greatly increased.

In the present invention, as the material used for the plates 6 and 6 ', any of a metal plate and a synthetic resin plate can be used. However, when the pipe fixing bracket 3 after injection molding is used with the plate attached, the plate 6
It is desirable to use a synthetic resin plate because the fusion bonding between the injection-molded resin bracket 3 and the injection-molded resin bracket 3 can be reliably performed, and it is also preferable to remove the plates 6, 6 'from the bracket 3 after injection molding. In this case, it is recommended to use a metal plate such as a stainless steel plate from the viewpoint of releasability and durability against repeated use.

In the case where the bracket 3 is used with the plate attached, the injection is performed by providing the inner surfaces of the resin plates 6 and 6 ', that is, the bracket forming surface formed by injection molding, with irregularities, protrusions or claws. Since the formation of the bond with the resin can be further strengthened, there is no possibility that the plate layer may be peeled off during use.

The resin used for injection molding is generally polyethylene, polypropylene,
What is necessary is just to use thermoplastics, such as polyacetal and ABS resin.

(Example) Using a split mold for injection molding having a 60 mm x 60 mm x 20 mm cavity inside, and forming a 30 mm x 30 mm opening in each of the central portions of the wide side walls facing each other, 2mm × insert holes with a diameter of 8.0mm are formed at four places near the center of the board surface
Two polyacetal (POM) resin plates of 50 mm x 50 mm were opposed to each other so that the interval between the inner wall surfaces was 18 mm, and each of the insertion holes was cut into a desired length with an inner diameter of 6.0 mm and an outer diameter of 8.0 mm. Four thin resin tubes made of nylon (PA11) were inserted through the tube, and the tube was set at a position where the opening of the mold was closed by the plate.

Next, polypropylene (PP) resin melted at a temperature of 160 ° C. is injected and filled into the cavity at a mold internal pressure of 250 kgf / cm ² from the injection port of the mold, and then cooling water is poured into a cooling water passage of the mold. By supplying, the molten resin injected into the cavity was cooled and solidified. As a result, 2 is formed in the mold cavity.
A resin tube fixing bracket was formed in which a resin plate, a resin tube inserted therethrough, and a resin solidified so as to fill the space between them were integrated.

Next, the bracket was taken out of the mold, but since the mold has an opening in the wall surface through which the resin tube is inserted, the mold can be opened irrespective of the position of the dividing line. There was no hindrance to taking out the garbage.

(Effect of the Invention) As described above, according to the present invention, when manufacturing a bracket for fixing and fixing a small-diameter pipe by using an injection molding method, the degree of freedom in designing the arrangement of pipes to be arranged for focusing and fixing is greatly increased. Since, for example, a three-dimensional arrangement is also possible, centralized piping in an extremely narrow place such as an engine room of an automobile can be performed with a high volumetric efficiency, and without preparing a complicated and large number of divided molds. Also, the mold structure can be used with a conventional simple two-piece mold with only a slight processing, so that the economic effect is high.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the appearance of a pipe insertion plate inserted and installed in a mold when the bracket for fixing and fixing a small diameter pipe of the present invention is injected, and FIG. 2 is a perspective view showing the pipe insertion plate shown in FIG. FIG. 3 is a perspective view showing the appearance of a bracket for fixing and fixing a pipe obtained by the present invention, and FIG. 4 is a pipe insertion hole in a plate. FIG. 1 ... piping, 2 ... split mold, 2 '... split line, 3
... bracket, 4 ... cavity, 5, 5 '... opening,
6, 6 '... plate, 7, 7' ... insertion hole, 8, 8 '
… Lip-shaped protrusion, 9… cooling water channel.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B29C 45/00-45/84

Claims (1)

(57) [Claims] An opening is formed by cutting out a part of two opposing side walls of a split mold having a cavity so as to obtain a bracket of a desired shape, and each opening is closed. And converging and fixing a small-diameter pipe by injecting a molten resin into a cavity of the mold with a three-dimensionally arranged pipe inserted between the plates. Injection molding method for brackets.