JP2015168105A - Mold method of wire harness member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mold method of a wire harness member which can cope with various kind and small amount production inexpensively according to a harness attachment component.SOLUTION: A mold method of a wire harness member comprises: a cavity 17 and a harness storage part 43 for molding a harness attachment component to an outer periphery of a wire harness. The mold method comprises: a resin mold molding step for molding an upper resin mold 31 and a lower resin mold 33 in which the cavity 17 is formed on an inner surface 45 for forming the harness storage part 43 by a master metal mold, respectively; and a component molding step for storing an intermediate part of the wire harness in the harness storage part 43, and injecting the molten thermoplastic resin into the cavity 17 by low pressure injection for low pressure injection molding of the harness attachment component on the outer periphery of the wire harness by the upper resin mold 31 and the lower resin mold 33 which are mold closed by a mold closing device.

Description

  The present invention relates to a method for molding a wire harness member in which a harness-mounted component is molded on the outer periphery of the wire harness member.

A method of manufacturing a wire harness molded with resin is disclosed in Patent Document 1. This wire harness manufacturing method is a method of manufacturing a wire harness (wire harness member) in which a plurality of electric wire groups 501 are bundled while branching at a branch portion, as shown in FIG.
For the manufacture of the wire harness, first, a branching part forming die 507 is prepared in which a mold surface is formed that forms an accommodation space in which the branching part can be accommodated in a state where at least two lower molds 503 and 505 are combined. . Next, branch portions of the plurality of electric wire groups 501 are housed in the housing space of the branch portion molding die 507. Then, heat-softened resin is injected into the accommodation space using an injection device 511 such as a hot gun through an injection port 509 formed so as to open at the intersection portion of the branch portion of the branch portion mold 507.
The lower mold 503 and the upper mold 505 of the branching partial mold 507 are formed of a heat-resistant resin that can withstand the temperature of the heat-softened resin, such as an ABS resin. According to this method for manufacturing a wire harness, the resin can be spread evenly so as to cover the branched portion of the wire harness.

JP 2013-45678 A

However, in general, a harness mounting part that covers the periphery of a predetermined portion of a wire harness member such as a wire harness or a wire protection member (corrugated tube, protector) is properly used depending on the harness diameter, the presence or absence of a clip, the clip shape, and the like. Therefore, a molding die corresponding to these harness mounting parts is required. In general, an injection molding machine including a molding die is used to mold a molding member on a predetermined portion of a conventional wire harness member. An injection mold of an injection molding machine is generally expensive and has low versatility. Therefore, preparing a plurality of such injection molds according to the harness diameter, the presence / absence of a clip, the clip shape, and the like has a problem in that the equipment cost increases.
In addition, a resin lower mold 503 and an upper mold 505 have been proposed, such as a branched partial mold 507 used in the method for manufacturing a wire harness disclosed in Patent Document 1. However, the lower mold 503 and the upper mold 505 are installed on a drawing board or the like for assembling the wire harness, and the guide convex portions 513a and 513b of the lower mold 503 are fitted into the guide concave portions 515a and 515b of the upper mold 505. It is used while injecting a resin into the accommodation space of the combined branching part forming die 507 using an injection device 511 such as a hot gun.
Therefore, it is difficult to use in the case where a large number of harness mounting parts that cover the periphery of a predetermined portion of the wire harness member are injection-molded. That is, in order to injection-mold a harness-fitted part having a functional part such as a clip, it is necessary to securely fill and cure the molten resin in a small cavity for molding the functional part. Therefore, it is almost impossible to injection-mold the harness-mounted component using the branch portion molding die 507 that is not equipped with a mold clamping device.

  The present invention has been made in view of the above situation, and an object of the present invention is to provide a method for molding a wire harness member that can easily cope with a small variety production of harness-mounted components.

The above object of the present invention is achieved by the following configuration.
(1) The harness includes a cavity for forming a harness mounting component on the outer periphery of a long wire harness member, and a harness housing portion that houses a middle portion of the wire harness member on a pair of divided surfaces. A resin mold forming step in which a set of resin molds in which the cavity is formed on the inner surface forming the housing portion is molded with a master mold, respectively;
The wire harness member is housed in a set of the resin molds clamped by a mold clamping device by accommodating an intermediate part of the wire harness member in the harness accommodating part and injecting a molten thermoplastic resin into the cavity at a low pressure. A component molding step of low-pressure injection molding the harness-mounted component on the outer periphery of
A method of molding a wire harness member, comprising:

According to the method for molding a wire harness member having the above configuration (1), first, a harness housing part for housing an intermediate part of the wire harness member on a pair of split surfaces and a harness mounting part are molded by a master mold. A set of resin molds is formed in which cavities are formed. And a wire harness member is arrange | positioned at a set of resin-type harness accommodating parts. The resin mold is clamped by a mold clamping device with the wire harness member interposed therebetween. Therefore, a cavity corresponding to the resin mold is disposed between the wire harness member disposed inward and the inner surface of the harness housing portion. The thermoplastic resin melted in this state is injected into the cavity at a low pressure. By supplying a predetermined amount of the thermoplastic resin, the cavity is filled with the thermoplastic resin. The thermoplastic resin is cured to form a harness mounting component having an outer shape of the inner surface of the cavity on the outer periphery of the wire harness member.
The master mold can mold another resin mold having a cavity having a shape different from that of the resin mold. Then, by molding a thermoplastic resin on the outer periphery of the wire harness member using the same procedure as described above using another resin mold, a different type of harness-mounted component can be formed on the outer periphery of the wire harness member. it can.
That is, the resin mold molded by the master mold is easy to produce in a wide variety and in small quantities compared to the metal mold. Therefore, it is possible to supply a large number of resin molds of the same shape to resin molding machines installed in a plurality of wire harness production lines at the same time, and quickly supply a plurality of types of resin molds having different cavities. Can do.
Therefore, the method for molding the wire harness member can easily cope with a variety of small-quantity production of harness-mounted components formed on the outer periphery of the wire harness member.

(2) A method for molding a wire harness member having the configuration of (1) above, wherein the master mold selectively uses a plurality of inserts having different shapes for forming at least a part of the cavity. A method of molding a wire harness member, wherein a plurality of types of resin molds having different cavities for molding different types of harness-mounted components are molded.

According to the method for molding a wire harness member having the configuration of (2) above, by selectively using a plurality of nestings having different shapes, the master mold has a plurality of cavities having different shapes while sharing the mold body. A seed resin mold can be formed relatively easily.
Therefore, it is possible to easily cope with a variety of small-quantity production of harness mounting parts formed on the outer periphery of the wire harness member.

(3) A method for molding a wire harness member configured as described in (2) above, wherein the insert corresponds to the cavity for forming a functional part of the harness-mounted component. Mold method.

According to the molding method of the wire harness member having the configuration of (3) above, it is possible to relatively easily mold a plurality of types of resin molds having cavities having different shapes depending on the functional part of the harness-mounted component.
Therefore, a plurality of types of harness mounting parts having different functional parts such as clips can be easily molded into the wire harness member.

  According to the method of molding a wire harness member according to the present invention, it is possible to easily cope with a variety of small-quantity production of harness-mounted components.

  The present invention has been briefly described above. Further, the details of the present invention will be further clarified by reading through a mode for carrying out the invention described below (hereinafter referred to as “embodiment”) with reference to the accompanying drawings. .

(A) is the top view which looked at the lower mold of the master metal mold | die used for the molding method of the wire harness member which concerns on one Embodiment of this invention from the upper side, (b) is the plane which looked at the upper mold from the downward direction FIG. FIG. 2 is a perspective view of an upper mold and a lower mold shown in FIG. 1. (A) is the top view which looked at the upper resin type | mold of the resin type shape | molded by the master metal mold | die shown in FIG. 1 from the downward side, (b) is the lower resin type | mold combined with the upper resin type | mold shown in (a). It is the top view which looked at from the upper part. It is a disassembled perspective view for demonstrating replacement | exchange of the nest | insert in the lower metal mold | die shown in FIG. It is the top view which looked at the upper metal mold | die from which the nest | exchange was replaced | exchanged from upper direction. It is a perspective view of a pair of resin mold shape | molded by the master metal mold | die. It is a perspective view of a micro molding machine. It is a perspective view of a pair of resin type | mold for shape | molding another harness mounting component. (A) is a front view of the wire harness member in which the harness mounting component with a clip is molded, and (b) is a front view of the wire harness member in which the harness mounting component without a clip is molded. It is a perspective view of a pair of resin mold shape | molded by the master metal mold | die used for the molding method of the wire harness member which concerns on other embodiment of this invention. It is a front view of the wire harness member shape | molded by a pair of resin type | mold shown in FIG. It is a perspective view which shows the branch part shaping | molding die of the conventional wire harness.

Embodiments according to the present invention will be described below with reference to the drawings.
The wire harness member molding method according to an embodiment of the present invention includes, for example, a master mold 13 shown in FIGS. 1 and 2, a resin mold 15 shown in FIG. 3, and a micro molding machine 35 shown in FIG. used. And the harness mounting component 47 as shown to Fig.9 (a) is molded on the outer periphery of the wire harness 41 which is a elongate wire harness member.
The master mold 13 of the present embodiment is a master mold for molding the upper resin mold 31 in the resin mold 15. In the molding method of the wire harness member of the present embodiment, the other master mold (not shown) for molding the lower resin mold 33 in the resin mold 15 is also used, but the configuration substantially the same as that of the master mold 13 of the present embodiment. Therefore, detailed description is omitted.

As shown in FIGS. 1 and 2, the master mold 13 according to this embodiment includes a pair of metal upper mold 23 and lower mold 21. The upper mold 23 is provided with a gate 22 for injecting injection molding resin into the molding space 14 of the master mold 13.
In the lower mold 21, an upper resin mold molding recess 29 is provided in the lower mold dividing surface 25. In the present embodiment, the upper resin mold molding recess 29 is a flat rectangular parallelepiped space (see FIG. 2), and the upper resin mold 31 described later is molded between the upper mold 23 and the upper mold dividing surface 27. Forming space 14 is formed.

  That is, the master mold 13 is for molding the upper resin mold 31 in the resin mold 15 (see FIG. 3). For this reason, an inner surface shape corresponding to the cavity 17 of the upper resin mold 31 for forming the harness mounting component 47 is formed at the bottom of the upper resin mold molding recess 29. That is, at the bottom of the upper resin mold molding recess 29, the first shape portion 36 corresponding to the harness housing portion 43 and the mesh tube body 49, the second shape portion 38 corresponding to the clip portion molding portion 57, and the supply path 19 are supported. The fourth shape portion 44 corresponding to the third shape portion 42 and the mold fixing hole 50 is provided so as to protrude.

Note that the lower mold 21 of the present embodiment has a nested structure, and a nested part 34 is fitted in a nested mounting recess 32 provided in the bottom of the upper resin mold forming recess 29. The nest 34 is provided with a second shape portion 38 and a third shape portion 42. As shown in FIGS. 4 and 5, a nest 34 </ b> A in which a second shape portion 38 </ b> A and a third shape portion 42 are protruded can be fitted into the nest mounting recess 32 of the lower mold 21. That is, by selectively using the plurality of inserts 34 and 34A, the master mold 13 shares the lower mold 21 and has the upper resin molds 31 and 31A having cavities 17 having different shapes (see FIGS. 6 and 8). ) Can be formed.
In addition, the lower mold 21 may be provided with an ejector pin (not shown) that can protrude into the molding space 14 in order to take out the upper resin mold 31.

Then, an injection molding resin is injected from the gate 22 into the molding space 14 of the master mold 13, and the upper resin mold 31 is injection molded. As the injection molding resin for molding the upper resin mold 31, a resin having heat resistance that can withstand the temperature of the molding resin for molding the harness mounting part 47, for example, ABS resin or the like is used. The injection molding resin is injected into the molding space 14 through the gate 22 by an injection device (not shown).
As a result, the injection molding resin filled in the molding space 14 of the master mold 13 is cured, and as shown in FIG. 3A, the harness housing portion 43 that houses the intermediate portion of the wire harness 41 on the dividing surface 37. The upper resin mold 31 in which the cavity 17 for molding the harness mounting part 47, the supply path 19, and the mold fixing hole 50 are formed is molded. Similarly, to form a harness housing part 43 for housing the intermediate part of the wire harness 41 and the harness mounting part 47 on the dividing surface 39, as shown in FIG. The lower resin mold 33 in which the cavity 17 and the mold fixing hole 50 are formed is also molded.

As shown in FIG. 6, the resin mold 15 of this embodiment includes an upper resin mold 31 and a lower resin mold 33.
The resin mold 15 formed of ABS resin or the like is used for low pressure injection molding using a micro molding machine 35 provided with a low pressure injection device 40 shown in FIG. The upper resin mold 31 and the lower resin mold 33 include a harness accommodating portion 43 that accommodates an intermediate portion of the wire harness 41 (see FIG. 9) on a pair of divided surfaces 37 and 39 to be divided. In the upper resin mold 31 and the lower resin mold 33, the cavity 17 is formed on the inner surface 45 that forms the harness housing portion 43.

  In the cavity 17 of this embodiment, the opening opposite to the inner surface 45 is closed by the outer periphery of the wire harness 41. The cavity 17 is in a state where both ends in the longitudinal direction of the wire harness 41 accommodated in the harness accommodating portion 43 are left open. That is, if the molten thermoplastic resin continues to be supplied, the fluid thermoplastic resin flows out from the open portion.

  In the molding method of the wire harness 41 according to the present embodiment, a plurality of sets of resin molds 15 and 15A in which cavities 17 having different shapes are formed are arranged. That is, a plurality of types of upper resin molds 31 and 31A and lower resin molds 33 and 33A having different cavity shapes are arranged for molding different harness mounting parts 47 (see FIGS. 6 and 8). The plurality of upper resin dies 31, 31A and lower resin dies 33, 33A are all formed by the master die 13 as described above. That is, for example, by selectively using the inserts 34 and 34A of the master mold 13, the upper resin molds 31 and 31A having the cavities 17 having different shapes can be molded while sharing the lower mold 21.

  The cavity 17 formed in the inner surface 45 of the upper resin molds 31 and 31A and the lower resin molds 33 and 33A has an inner surface shape that is the outer shape of the harness mounting component 47 (see FIG. 9). The cavity 17 is supplied with a thermoplastic resin having fluidity along the outer periphery of the wire harness 41. As the thermoplastic resin, nylon, polyolefin, polypropylene or the like can be used. The thermoplastic resin is heated and softened using the low-pressure injection device 40, is made into a flowable state, and is injected into the cavity 17 through the supply path 19.

  By supplying a predetermined amount of the thermoplastic resin, the cavity 17 is filled with the thermoplastic resin. Here, the volume of the thermoplastic resin used for molding is slightly smaller than the volume of the cavity 17. That is, the cavity 17 is designed to be larger (longer) than the range reached by the thermoplastic resin.

In the resin mold 15 (15A) of the present embodiment, the temperature is kept below the temperature at which the thermoplastic resin has fluidity. That is, the thermoplastic resin that has flowed into the cavity 17 is deprived of heat by the resin mold 15 (15A) and loses its fluidity to be cured. The thermoplastic resin is cured to form a harness mounting part 47 having an inner shape of the cavity 17 as an outer shape on the outer periphery of the wire harness 41.
Therefore, if the cavity 17 is formed so as to surround the outer periphery of the wire harness 41, the formed harness mounting component 47 is formed in a tube shape into which the wire harness 41 is inserted. The shape of the cavity 17 can be a net structure, for example. As a result, as shown in FIGS. 9A and 9B, a harness mounting part 47 (55) for covering the outer periphery of the wire harness 41 with the mesh tube body 49 is obtained.

The thermoplastic resin undergoes polymerization to form a polymer network structure when heated, and is not cured and restored. If the harness mounting component 47 (55) is a binding material or the like, the wire harness 41 composed of the wire bundle is bound with a predetermined strength. Further, if the clip portion 53 is formed at the same time as the harness mounting component 47, the bundled wire harness 41 can be fixed to the vehicle body panel or the like with a predetermined strength via the clip portion 53.
As the thermoplastic resin, an ultraviolet curable resin can be used instead. In this case, in order to enable the cavity 17 to be irradiated with ultraviolet rays, the resin mold 15 is preferably formed of a transparent resin.

In the resin molds 15 and 15A according to the present embodiment, the upper and lower resin molds 31 and 33 in which the clip part molding part 57 is attached to the cavity 17 shown in FIGS. 3 and 6 or the clip part molding part 57 shown in FIG. 8 is omitted. The upper and lower resin molds 31A and 33A can be aligned. Thereby, the harness mounting component 47 having the clip portion 53 shown in FIG. 9A and the harness mounting component 55 having no clip portion 53 shown in FIG.
As shown in FIG. 3A, the clip portion forming portion 57 of the cavity 17 includes a C-shaped nail forming cavity portion 59, a leg forming cavity portion 61, and a flange portion forming cavity portion 63. The flange forming cavity 63 is connected to the mesh tube forming cavity 65. A runner 67 is connected to the nail forming cavity 59. The runner 67 is connected to the supply path 19.

  A supply path 19 (sprue) is formed in the upper resin molds 31 and 31A of the resin molds 15 and 15A according to the present embodiment. The supply path 19 opens above the upper resin molds 31 and 31A, passes through the upper resin molds 31 and 31A, and communicates with the cavity 17 (see FIGS. 6 and 8). As a result, the thermoplastic resin can flow into the cavity 17 from the outside of the upper resin molds 31 and 31 </ b> A through the supply path 19.

  In addition, the resin molds 15 and 15 </ b> A may be provided with ejector pins (not shown) that can protrude into the cavity 17 in order to take out the harness mounting component 47. However, in this embodiment, the harness mounting components 47 and 55 are molded on the outer periphery of the wire harness 41. For this reason, an ejector pin can be made unnecessary. That is, the mold part can be easily taken out from the resin molds 15 and 15A by using the wire harness 41 led out from both sides of the resin molds 15 and 15A.

For injection of the thermoplastic resin into the cavity 17 in the resin mold 15 (15A), a micro molding machine 35 shown in FIG. 7 is used. The micro molding machine 35 is a resin molding machine that can be operated by one worker without external power such as an electric motor, and is a resin mold 15 (15A) and a mold clamping device (not shown) for opening and closing the resin mold 15 (15A). ) And a low pressure injection device 40 for injecting the molten resin into the resin mold 15 (15A) under pressure.
The low pressure injection device 40 has a heating cylinder 71 provided with a heater for heating and melting synthetic resin such as polypropylene, a plunger 73 for injecting the molten resin of the heating cylinder 71 from a nozzle (not shown), and the plunger 73 is advanced. The injection cylinder 75, a handle 77 that drives the injection cylinder 75, and a temperature controller 79 that maintains the heating temperature of the heating cylinder 71 at a desired temperature are supported by a column 83 that stands on a pedestal 81. Is done.

  Note that the micro molding machine 35 in this embodiment has a maximum amount of resin that can be molded by one injection molding of about several tens of grams, and when the resin mold 15 is clamped, an air cylinder or This can be performed manually using a link or the like. Note that the low pressure injection device 40 may drive the injection cylinder 75 by external power such as an electric motor or air. More specifically, as the micro molding machine 35, for example, a known “injection molding apparatus” disclosed in JP 2010-260297 A, JP 2012-30429 A, JP 2013-103492 A, and the like. Can be used.

The resin mold 15 (15A) of the present embodiment is disposed on the pedestal 81. The resin mold 15 (15A) is formed by the upper resin mold 31 (31A) and the lower resin mold 33 (33A) being sandwiched and fitted so as to accommodate the wire harness 41 in the harness accommodating portion 43. It becomes a possible cavity. And the harness mounting component 47 (55) is injection-molded on the outer periphery of the wire harness 41 by supplying the molten thermoplastic resin from the supply passage 19 via the runner 67 to the cavity.
In the present embodiment, the resin mold 15 (15A) is described as having a horizontal split type, but the resin mold 15 (15A) may be a vertical split mold.

Next, a method for molding the wire harness 41 according to this embodiment will be described.
According to the molding method of the wire harness 41 of the present embodiment, first, the master mold 13 forms the harness housing part 43 and the harness mounting part 47 that house the intermediate part of the wire harness 41 on the pair of split surfaces 37 and 39. A pair of the upper resin mold 31 and the lower resin mold 33 in which the cavities 17 are formed are molded (resin mold molding process).

  And the wire harness 41 which is a long wire harness member is arrange | positioned at the harness accommodating part 43 of the upper resin type | mold 31 and the lower resin type | mold 33. FIG. The upper resin mold 31 and the lower resin mold 33 of the resin mold 15 are clamped by a mold clamping device with the wire harness 41 interposed therebetween. Therefore, the cavity 17 corresponding to the resin mold 15 is disposed between the wire harness 41 disposed inward and the inner surface of the harness housing portion 43. The thermoplastic resin melted in this state is injected into the cavity 17 at a low pressure. By supplying a predetermined amount of the thermoplastic resin, the cavity 17 is filled with the thermoplastic resin. By curing the thermoplastic resin, the harness mounting component 47 having the inner shape of the cavity 17 as the outer shape is molded on the outer periphery of the wire harness 41 (component molding process).

The master mold 13 can mold another resin mold 15 </ b> A having a cavity 17 having a shape different from that of the resin mold 15. Then, by molding a thermoplastic resin on the outer periphery of the wire harness 41 using the resin mold 15A in the same procedure as described above, a different type of harness mounting component 55 can be formed on the outer periphery of the wire harness 41. it can.
That is, the resin molds 15 and 15A molded by the master mold 13 are easy to produce in a variety of types and in small quantities compared to metal molds. Therefore, a plurality of types of resin molds 15 and 15A having different cavities 17 can be supplied to the micro-molding machines 35 installed in a plurality of wire harness production lines in large quantities at substantially the same time. Can be supplied quickly.

According to the molding method of the wire harness 41 of the present embodiment, the master mold 13 is different while sharing the lower mold 21 which is a mold body by selectively using a plurality of nestings 34 and 34A having different shapes. A plurality of types of resin molds 15 and 15A including the upper resin molds 31 and 31A and the lower resin molds 33 and 33A having the shape cavity 17 can be molded relatively easily.
Therefore, it is possible to easily cope with the high-mix low-volume production of the harness mounting parts 47 and 55 formed on the outer periphery of the wire harness 41.

Moreover, according to the molding method of the wire harness 41 of the present embodiment, a plurality of types of resin molds 15 having the cavities 17 having different shapes depending on the presence or absence of the clip portion 53 that is a functional portion of the harness mounting components 47 and 55. 15A can be molded relatively easily.
Accordingly, a plurality of types of harness mounting components 47 and 55 having different presence or absence of the clip portion 53 can be easily molded into the wire harness 41.

Therefore, according to the molding method of the wire harness 41, it is possible to easily cope with a small variety production of the harness mounting parts 47 and 55 formed on the outer periphery of the wire harness 41. In addition, the resin molds 15 and 15A having the same quality can be used at a low cost at a plurality of production bases.
In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably. In addition, the material, shape, dimensions, number, arrangement location, and the like of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.

According to the molding method of the wire harness 41 of the above embodiment, the case where the harness mounting components 47 and 55 are molded in the linear intermediate portion of the wire harness 41 has been described as an example. Needless to say, the position of the harness 41 is not limited to a linear intermediate portion, and may be a bent or branched intermediate portion.
Further, in the master mold 13 according to the above-described embodiment, the nest 34 in which the second shape portion 38 and the third shape portion 42 are protruded, and the second shape portion 38A and the third shape portion 42 are protruded. Although the insert 34A is configured to be selectively fitted into the insert mounting recess 32 of the lower mold 21, the present invention is not limited to this. For example, a master mold that can selectively use a plurality of nestings each projecting from a first shape portion 36 having a different size may be configured so that the wire harnesses 41 having different harness diameters can be easily handled. it can.

Furthermore, in the said embodiment, although the case where the harness mounting components 47 and 55 were mold-formed to the wire harness 41 was demonstrated to the example, as a long wire harness member of this invention, not only the wire harness 41 but a corrugated tube, The harness mounting component 47A can be molded on a wire protection member such as a protector.
As shown in FIG. 10, a resin mold 15B used in a method for molding a corrugated tube 41A according to another embodiment of the present invention is composed of an upper resin mold 31B and a lower resin mold 33B.
A resin mold 15B formed of ABS resin or the like is used for low pressure injection molding using a micro molding machine 35 provided with a low pressure injection device 40 shown in FIG. The upper resin mold 31B and the lower resin mold 33B include a harness accommodating portion 43B that accommodates an intermediate portion of the corrugated tube 41A on a pair of divided surfaces 37 and 39 to be divided. In the upper resin mold 31B and the lower resin mold 33B, a cavity 17B is formed on an inner surface 45B that forms the harness housing portion 43B. Further, a clip portion molding portion 57B is attached to the cavity 17B.

  In the cavity 17B of the present embodiment, the opening opposite to the inner surface 45B is closed by the outer periphery of the corrugated tube 41A. The cavity 17B is in a state in which both longitudinal ends of the corrugated tube 41A accommodated in the harness accommodating portion 43B are left open. That is, if the molten thermoplastic resin continues to be supplied, the fluid thermoplastic resin flows out from the open portion.

  In the molding method of the corrugated tube 41A according to another embodiment of the present invention, a plurality of sets of resin molds (not shown) in which cavities having shapes different from the cavities 17B are formed. That is, a plurality of types of upper resin molds 31B and lower resin molds 33B having different cavity shapes are prepared for molding different harness mounting parts 47B (see FIG. 11). The plurality of upper resin molds 31B and lower resin molds 33B are all formed by the master mold 13 as described above. In other words, for example, by selectively using a nest (not shown) of the master mold 13, the upper resin mold 31 </ b> B having the cavities 17 </ b> B having different shapes can be molded while sharing the lower mold 21.

  In the cavity 17B formed in the inner surface 45B of the upper resin mold 31B and the lower resin mold 33B shown in FIG. 10, the inner surface shape is the outer shape of the harness mounting component 47B (see FIG. 11). The cavity 17B is supplied with a thermoplastic resin having fluidity along the outer periphery of the corrugated tube 41A. As the thermoplastic resin, nylon, polyolefin, polypropylene or the like can be used. The thermoplastic resin is heated and softened using the low-pressure injection device 40, is made into a flowable state, and is injected into the cavity 17 </ b> B through the supply path 19.

  By supplying a predetermined amount of the thermoplastic resin, the cavity 17B is filled with the thermoplastic resin. Here, the volume of the thermoplastic resin used for molding is slightly smaller than the volume of the cavity 17B. That is, the cavity 17B is designed to be larger (longer) than the range reached by the thermoplastic resin.

  The resin mold 15B of the present embodiment is kept below the temperature at which the thermoplastic resin has fluidity. That is, the thermoplastic resin that has flowed into the cavity 17B is deprived of heat by the resin mold 15B and loses its fluidity and is cured. When the thermoplastic resin is heated, it polymerizes to form a polymer network structure, which is cured and cannot return to its original shape, so that the harness mounting component 47B having the outer shape of the inner surface of the cavity 17B becomes the outer periphery of the corrugated tube 41A. To form.

Therefore, if the cavity 17B is formed so as to surround the outer periphery of the corrugated tube 41A, the formed harness mounting part 47B is formed in a tube shape covering the outer periphery of the corrugated tube 41A. The shape of the cavity 17B can be, for example, a cylindrical structure. Thereby, as shown in FIG. 11, the harness mounting component 47B which coat | covered the cylindrical tube body 49A on the outer periphery of the corrugated tube 41A is obtained.
Since the clip portion 53A is formed simultaneously with the harness mounting component 47B, the corrugated tube 41A inserted through the wire harness 41 can be fixed to the vehicle body panel or the like with a predetermined strength via the clip portion 53.

The resin mold according to the present embodiment includes an upper and lower resin mold in which the clip part molding part 57 is omitted in addition to the resin mold 15B having the upper and lower resin molds 31B and 33B provided with the clip part molding part 57B in the cavity 17B shown in FIG. A resin mold (not shown) having the following can be prepared. Thereby, the harness mounting component 47B having the clip portion 53A shown in FIG. 11 and the harness mounting component (not shown) not having the clip portion 53A can be manufactured.
Therefore, according to the molding method of the corrugated tube 41A using the resin mold 15B, it is possible to easily cope with the high-mix low-volume production of the harness mounting component 47B formed on the outer periphery of the corrugated tube 41A. It is also possible to use the resin mold 15B of the same quality at a plurality of production bases at a low cost.

13 ... Master mold 15 ... Resin mold 17 ... Cavity 19 ... Supply path 29 ... Upper resin mold molding recess 31 ... Upper resin mold (a set of resin molds)
33 ... Lower resin mold (a set of resin molds)
34 ... Nest 35 ... Micro molding machine 37 ... Dividing surface 39 ... Dividing surface 40 ... Low pressure injection device 41 ... Wire harness 43 ... Harness accommodating part 45 ... Inner surface 47 ... Harness mounting component 53 ... Clip part (functional part)

Claims (3)

A cavity for forming a harness mounting part on the outer periphery of a long wire harness member; and a harness housing portion for housing an intermediate portion of the wire harness member on a pair of split surfaces to be divided; A resin mold forming step in which a set of resin molds in which the cavity is formed on the inner surface to be formed is respectively molded with a master mold,
The wire harness member is housed in a set of the resin molds clamped by a mold clamping device by accommodating an intermediate part of the wire harness member in the harness accommodating part and injecting a molten thermoplastic resin into the cavity at a low pressure. A component molding step of low-pressure injection molding the harness-mounted component on the outer periphery of
A method of molding a wire harness member, comprising:   The master mold has the cavities of different shapes for molding different types of harness mounting parts by selectively using a plurality of nestings having different shapes for molding at least a part of the cavities. The method for molding a wire harness member according to claim 1, wherein the plurality of types of resin molds are molded.   The method for molding a wire harness member according to claim 2, wherein the nest corresponds to the cavity for molding a functional part of the harness-mounted component.

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