JP2015168107A - Mold method of wire harness member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mold method of a wire harness member which does not require a structure or member for sealing a molding resin on an opening end part of a molding mold into which the wire harness member is inserted.SOLUTION: A mold method of a wire harness 17 comprises: a harness storage step for storing the wire harness 17 in a harness storage part 45 on a resin mold 21 comprising: a harness storage part 45 for storing an intermediate part of the wire harness 17; and a cavity 23 formed in an inner surface 47 of the harness storage part 45 and having a volume larger than a resin amount of thermoplastic resin for molding a harness attachment component 15; and a resin injection step for performing low pressure injection of molten resin 49 to the resin mold 21 in which a mold temperature of a vicinity of both end opening parts 67 thereof is equal to or less than a resin melting temperature, from a supply channel 25 disposed on an approximately center of the cavity 23.

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. As shown in FIGS. 8A and 8B, this method of manufacturing a wire harness 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.
For the production of the wire harness, first, a branch part forming die 507 is prepared in which a mold surface is formed that forms an accommodation space 513 that can accommodate a branch part in a state where at least two lower molds 503 and 505 are combined. To do. Next, branch portions of the plurality of electric wire groups 501 are housed in the housing space 513 of the branch portion molding die 507. Then, the heat-softened resin is injected into the accommodation space 513 through an injection port 509 formed so as to open at the intersection of the branch portions 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, when a molding member such as a grommet, a protector, a clip or the like is molded in a predetermined portion of the wire harness using a molding die such as the above-described branching portion molding die 507, the branching portion of the lower die 503 and the upper die 505 is used. As shown in FIG. 8B, an arc-shaped elastic sealing member 511 formed of an elastomer such as rubber is required at a position surrounding the extended electric wire group 501 to suppress resin leakage. The elastic sealing member 511 formed on the inner peripheral surface of the opening of the accommodation space 513 suppresses resin leakage. Therefore, the size (diameter) of the space surrounded by the elastic sealing member 511 is the elastic sealing. It is set smaller than the diameter of the wire group 501 that passes between the members 511. The elastic sealing member 511 is attached to the lower mold 503 and the upper mold 505 by using, for example, an adhesive or a structure that fits into a fitting recess formed in the lower mold 503 and the upper mold 505. For this reason, there existed a problem that the lower mold | type 503 and the upper mold | type 505 became a complicated structure, and caused the raise of manufacturing cost.

  The present invention has been made in view of the above situation, and an object of the present invention is to provide a wire harness member that eliminates the need for a structure or member for sealing molding resin at the opening end of a molding die through which the wire harness member is inserted. It is to provide a molding method.

The above object of the present invention is achieved by the following configuration.
(1) A harness housing portion that is formed on a pair of divided surfaces and that accommodates an intermediate portion of a long wire harness member, and heat that is formed on the inner surface of the harness housing portion to form a harness mounting component A harness housing step of housing an intermediate portion of the wire harness member in the harness housing portion in a set of molds including a cavity having a volume larger than the resin amount of the plastic resin, and at least opening portions at both ends of the harness housing portion A resin injection step of low-pressure injection of the thermoplastic resin melted in the mold that has a mold temperature close to or lower than the resin melting temperature of the thermoplastic resin from a supply path provided substantially in the cavity. A method for molding a wire harness member.

According to the method for molding a wire harness member having the above configuration (1), when the molten thermoplastic resin is injected into the cavity of the molding die in which the long wire harness member is accommodated in the harness accommodating portion, a predetermined amount is obtained. Molten resin (the amount of thermoplastic resin for molding the harness-mounted component) enters the cavity.
The temperature of the molten resin injected into the cavity is lowered as the injection tip is advanced, and curing is accelerated, and the mold temperature in the vicinity of the opening portions at both ends of the harness housing portion is equal to or lower than the resin melting temperature of the thermoplastic resin. The molten resin cured at the injection tip itself has a sealing function. At the same time, the volume of the cavity is set larger than the resin amount of the thermoplastic resin for molding the harness-mounted component. Further, since the molten resin is injected into the cavity at a low pressure, the molten resin has fluidity, but the fluidity to the extent that it flows out beyond the opening portions at both ends of the harness housing portion is suppressed.
As a result, the molten resin does not flow out from the opening portions at both ends of the harness housing portion, and it is not necessary to provide structures and members for sealing the molded resin at the opening portions at both ends of the harness housing portion.
The harness mounting part molded in the middle part of the wire harness member is somewhat disturbed in the molding shape in the part corresponding to the vicinity of both ends of the harness housing part in the cavity, but in the part corresponding to the center of the cavity. Molding is completed into a shape that can exhibit its function, and the purpose of molding is achieved.

(2) The method for molding a wire harness member according to (1) above, wherein an injection tip of the thermoplastic resin injected into the cavity is cooled in the vicinity of both end openings of the harness housing portion in the mold. A method for molding a wire harness member, comprising a cooling mechanism.

  According to the molding method of the wire harness member having the configuration of (2) above, the molten resin injection tip that has been injected into the cavity and has reached the vicinity of both ends of the harness housing is forcibly cooled and cured by the cooling mechanism. To do. That is, it is possible to more reliably cure the molten resin injection tip in the vicinity of both end openings of the harness housing portion. Thereby, the sealing action with respect to the molten resin which arrives later by the molten resin which hardens | cures rapidly at the injection | pouring front | tip further increases. As a result, it is possible to manufacture a higher-quality harness-mounted component in which the molded shape in the portion corresponding to the vicinity of the opening portions at both ends of the harness housing portion is stable.

(3) A wire harness manufactured by the method for molding a wire harness member according to (1) or (2).

  According to the wire harness having the configuration (3), it is possible to obtain an inexpensive wire harness provided with a high-quality harness mounting component.

(4) The electric wire protection member manufactured with the molding method of the wire harness member of said (1) or (2).

  According to the wire harness having the configuration (3), an inexpensive electric wire protection member provided with a high-quality harness mounting part can be obtained.

  According to the method for molding a wire harness member according to the present invention, it is possible to eliminate the need for a structure or member for sealing the molding resin at the opening end of the mold through which the wire harness member is inserted. As a result, an inexpensive wire harness member having a high-quality harness mounting component can be obtained.

  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. .

It is explanatory drawing of the state which looked at the upper mold | type of the shaping | molding die for demonstrating the molding method of the wire harness member which concerns on one Embodiment of this invention from the lower surface side, (a) is explanatory drawing before molten resin injection | pouring, (b) is explanatory drawing in the middle of molten resin injection | pouring, (c) is explanatory drawing after completion of molten resin injection | pouring. (A) is the top view which looked at the upper mold | type of a pair of shaping | molding die used for the molding method of the wire harness member which concerns on one Embodiment of this invention from the downward side, (b) is the top view which looked at the lower mold from the upper side It is. FIG. 3 is a perspective view of an upper mold and a lower mold shown in FIG. 2. It is a perspective view of a micro molding machine. It is a front view of the wire harness member by which the harness mounting part with a clip was fabricated. It is a perspective view of the upper mold | type and lower mold | type 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 the upper mold | type and lower mold | type shown in FIG. (A) is a principal part perspective view of the conventional wire harness using a branching part shaping | molding die, (b) is a perspective view of the branching part shaping | molding die of (a).

Embodiments according to the present invention will be described below with reference to the drawings.
In the molding method of the wire harness member according to the embodiment of the present invention, for example, a resin mold 21 which is a mold shown in FIGS. 2 and 3 and a micro molding machine 13 shown in FIG. 4 are used. And the harness mounting component 15 as shown in FIG. 5 is molded on the outer periphery of the wire harness 17 which is a long wire harness member.
As shown in FIGS. 2 and 3, the resin mold 21 of the present embodiment includes a pair of resin upper mold 37 and lower mold 39.
The upper mold 37 and the lower mold 39 are formed of a heat-resistant resin that can withstand the temperature of the heat-softened molding resin, such as an ABS resin. The upper die 37 and the lower die 39 are used for low pressure injection molding using the micro molding machine 13 provided with the low pressure injection device 40 shown in FIG. The upper mold 37 and the lower mold 39 have a harness housing portion 45 that houses an intermediate portion of the wire harness 17 (see FIG. 5) in an upper mold dividing surface 41 and a lower mold dividing surface 43 that are a pair of divided surfaces. Is provided. In the upper mold 37 and the lower mold 39, the cavity 23 is formed on the inner surface 47 that forms the harness housing portion 45.

  In the cavity 23 of the present embodiment, the opening opposite to the inner surface 47 is closed by the outer periphery of the wire harness 17. The cavity 23 is in a state where both ends in the longitudinal direction of the wire harness 17 accommodated in the harness accommodating portion 45 are left open. That is, if molten thermoplastic resin (hereinafter also referred to as molten resin) 49 (see FIG. 1) continues to be supplied, the molten resin 49 having fluidity flows out from this open portion. The cavity 23 is formed on the inner surface 47 of the harness housing portion 45 that houses the wire harness 17 with a volume larger than the resin amount of the thermoplastic resin for molding the harness mounting component 15.

  A plurality of upper molds 37 and lower molds 39 of the resin mold 21 are arranged so that cavities 23 having different shapes are formed. That is, a plurality of types of upper molds 37 and lower molds 39 having different cavity shapes are prepared for molding different harness mounting parts 15, and a resin mold 21 selected as needed is attached to the micro molding machine 13. Different harness mounting parts 15 can be molded.

  The cavity 23 formed in the inner surface 47 of the upper die 37 and the lower die 39 has an inner shape that is the outer shape of the harness mounting component 15 (see FIG. 5). The cavity 23 is supplied with a molten resin 49 having fluidity along the outer periphery of the wire harness 17. As the molten resin 49, a thermoplastic resin such as nylon, polyolefin, or polypropylene 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 center of the cavity 23 through the supply path 25.

  Accordingly, when the molten resin 49 filled in the cavity 23 is cured, the harness mounting component 15 is formed. Therefore, if the cavity 23 is formed so as to surround the outer periphery of the wire harness 17, the molded harness mounting part 15 is formed in a tube shape into which the wire harness 17 is inserted. The shape of the cavity 23 can be a net structure, for example. Thereby, as shown in FIG. 5, the harness mounting component 15 which coat | covers the net-like tube body 51 on the outer periphery of the wire harness 17 is obtained.

  The clip part molding part 53 of the cavity 23 in the resin mold 21 of the present embodiment includes a C-shaped claw molding cavity 55, a leg body molding cavity 57, and a flange part molding cavity 59. The flange portion forming cavity portion 59 is connected to the mesh tube body forming cavity portion 61. A runner 63 is connected to the nail forming cavity 55. The runner 63 is connected to the supply path 25.

  In addition, the resin mold 21 may be provided with an ejector pin (not shown) that can protrude into the cavity 23 in order to take out the harness mounting component 15. However, in this embodiment, the harness mounting component 15 is molded on the outer periphery of the wire harness 17. For this reason, an ejector pin can be made unnecessary. That is, the mold part can be easily taken out from the resin mold 21 by using the wire harness 17 led out from both sides of the resin mold 21.

A micro molding machine 13 shown in FIG. 4 is used for injecting the molten resin 49 into the cavity 23 in the resin mold 21. The micro molding machine 13 is a resin molding machine that can be operated by one worker without external power such as an electric motor, and includes a resin mold 21, a mold clamping device (not shown) that opens and closes the resin mold 21, and a resin mold 21. And a low-pressure injection device 40 for injecting the molten resin 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 a molten resin 49 of the heating cylinder 71 from a nozzle (not shown), and the plunger 73 is advanced. An injection cylinder 75 to be driven, a handle 77 for driving the injection cylinder 75, and a temperature controller 79 for maintaining the heating temperature of the heating cylinder 71 at a desired temperature. Supported.

Note that the micro molding machine 13 in the present 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 21 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 13, for example, a well-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 21 of this embodiment is disposed on the pedestal 81. As shown in FIG. 3, the resin mold 21 is a cavity in which the cavity 23 can be molded by sandwiching the upper mold 37 and the lower mold 39 so as to accommodate the wire harness 17 in the harness accommodating portion 45. It becomes. And the harness mounting component 15 is injection-molded on the outer periphery of the wire harness 17 by supplying the molten resin 49 from the supply path 25 to the cavity through the runner 63.

Further, a cooling mechanism 85 (see FIG. 2) for cooling the injection tip of the molten resin 49 injected into the cavity 23 may be provided in the vicinity of both end openings 67 of the harness housing portion 45 in the resin mold 21. The cooling mechanism 85 is provided outside the resin mold 21 corresponding to the opening portions 67 at both ends, for example. Examples of the cooling mechanism 85 include an air cooling method using a cooling fin or a cold air blower, a water cooling method using a cooling water pipe, and electronic cooling using a Peltier element. With the cooling mechanism 85, the temperature of the injection tip of the molten resin 49 can be lowered to a temperature lower than normal temperature, and the hardening of the molten resin 49 can be locally promoted.
In this embodiment, the resin mold 21 has been described as having a horizontal split mold, but the resin mold 21 may be a vertical split mold.

Next, a method for molding the wire harness 17 according to this embodiment will be described.
In order to mold the harness mounting component 15 on the wire harness 17 by the molding method of the wire harness 17 of the present embodiment, an intermediate portion of the wire harness 17 is disposed in the harness housing portion 45 of the resin mold 21. The resin mold 21 is clamped by a mold clamping device with the wire harness 17 interposed therebetween (harness accommodating step).

As shown in FIG. 1A, the cavity 23 of the resin mold 21 is disposed between the wire harness 17 disposed inward and the inner surface 47 of the harness housing portion 45. In this state, as shown in FIG. 1B, when the molten resin 49 is supplied from the supply path 25 communicating with the heating cylinder 71 of the low-pressure injection device 40, the inflowing molten resin 49 enters the cavity 23 (resin injection Process).
By supplying a predetermined amount of the molten resin 49, the cavity 23 is filled with the molten resin 49 as shown in FIG. Here, the resin amount of the molten resin 49 used for molding is slightly smaller than the volume of the cavity 23. That is, the cavity 23 is designed to be larger (longer) than the range that the molten resin 49 reaches.

  In the resin mold 21 of the present embodiment, at least the mold temperature in the vicinity of both end openings 67 of the harness housing part 45 is equal to or lower than the resin melting temperature at which the molten resin 49 has fluidity. That is, the mold temperature in the vicinity of the supply path 25 of the resin mold 21 may be heated to a temperature equal to or higher than the resin melting temperature by heating with a heating means such as a heater as necessary in order to allow the molten resin 49 to flow into the cavity 23. However, no heating means is provided in the vicinity of both end openings 67 of the harness accommodating portion 45, and the mold temperature is equal to or lower than the resin melting temperature. In some cases, cooling is performed by the cooling mechanism 85 as described above. That is, the molten resin 49 that has flowed into the cavity 23 is deprived of heat by the resin mold 21 and loses its fluidity to be cured. The molten resin 49 is cured to form the harness mounting component 15 having the inner shape of the cavity 23 as an outer shape on the outer periphery of the wire harness 17. Therefore, the harness mounting component 15 is molded on the outer periphery of the wire harness 17.

  When heated, the molten resin 49 undergoes polymerization to form a polymer network structure, which is cured and cannot be restored. If the harness mounting component 15 is a binding material or the like, the wire harness 17 made of a wire bundle is bound with a predetermined strength. Further, if the clip portion 87 is simultaneously formed on the harness mounting component 15, the bundled wire harness 17 can be fixed to the vehicle body panel or the like with a predetermined strength via the clip portion 87.

Next, the effect | action of the molding method of the said wire harness 17 is demonstrated.
According to the molding method of the wire harness 17 according to the present embodiment, when the molten resin 49 is injected into the cavity 23 of the resin mold 21 in which the wire harness 17 is accommodated in the harness accommodating portion 45, a predetermined amount of the molten resin 49 is injected. (The amount of thermoplastic resin for molding the harness mounting component 15) enters the cavity 23.

  The temperature of the molten resin 49 injected into the cavity 23 is lowered as the injection tip is increased, and curing is promoted. The mold temperature in the vicinity of both end openings 67 of the harness housing portion 45 is equal to or lower than the resin melting temperature of the thermoplastic resin. . The molten resin 49 cured at the injection tip itself has a sealing function. At the same time, the volume of the cavity 23 is set larger than the resin amount of the thermoplastic resin for molding the harness mounting part 15. Further, since the molten resin 49 is injected into the cavity 23 by the low-pressure injection device 40 at a low pressure, the molten resin 49 has fluidity, but the fluidity to the extent that it flows out beyond the both end openings 67 of the harness housing portion 45 is suppressed. .

As a result, the molten resin 49 does not flow out from the opening portions 67 at both ends of the harness housing portion 45, and a structure or member for sealing the molding resin as in a conventional mold is used. 67 is not necessary.
Therefore, the resin mold 21 has a simple structure, and the manufacturing cost of the mold can be reduced. Further, even if the outer diameter of the wire harness 17 accommodated in the harness accommodating portion 45 changes somewhat, the molten resin 49 does not flow out from the both end openings 67 of the resin mold 21. Can respond flexibly. Furthermore, the outer diameter of the wire harness 17 can be made smaller than the inner diameter of the opening 67 at both ends of the resin mold 21 so that the harness biting at the time of mold clamping is less likely to occur.
The harness mounting part 15 molded in the middle part of the wire harness 17 is somewhat disturbed in the molded shape in the part corresponding to the vicinity of the both ends opening 67 of the harness housing part 45 in the cavity 23, but the center of the cavity 23 In the portion corresponding to, molding is completed to a shape that can exhibit its function, and the purpose of molding is achieved.

  Further, in the molding method of the wire harness 17 according to the present embodiment, the injection tip of the molten resin 49 that has been injected into the cavity 23 and has reached the vicinity of the both end openings 67 of the harness housing portion 45 is forcibly cooled by the cooling mechanism 85. And can be cured. That is, it is possible to more reliably cure the injection tip of the molten resin 49 in the vicinity of both end openings 67 of the harness housing portion 45. Thereby, the sealing action with respect to the molten resin 49 which arrives later by the molten resin 49 which hardens | cures rapidly at the injection | pouring terminal end further increases. As a result, it is possible to manufacture a higher-quality harness mounting component 15 in which the molded shape in the portion corresponding to the vicinity of the both-end opening 67 of the harness housing portion 45 is stable.

Therefore, according to the molding method of the wire harness 17 according to the present embodiment, a structure or member for sealing the molten resin 49 is not required at the opening end portion of the resin mold 21 through which the wire harness 17 is inserted. Can do. As a result, an inexpensive wire harness 17 having a high-quality harness mounting component 15 can be obtained.
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 method of molding the wire harness 17 of the above embodiment, the case where the harness mounting component 15 is molded on the linear intermediate portion of the wire harness 17 has been described as an example, but the wire harness 17 for molding the harness mounting component is described. It goes without saying that the position is not limited to a straight intermediate portion, but may be a bent or branched intermediate portion.
Further, the resin mold 21 of the above embodiment has been described by taking as an example the case where the resin upper mold 37 and the lower mold 39 are configured, but the mold may of course be made of metal.

Furthermore, in the said embodiment, although the case where the harness mounting component 15 was shape-molded to the wire harness 17 was demonstrated as an example, as a long wire harness member of this invention, not only the wire harness 17 but a corrugated tube, a protector, etc. The harness mounting component 15A can be molded on the electric wire protection member.
As shown in FIG. 6, the resin mold 21B used in the molding method of the corrugated tube 17A according to another embodiment of the present invention is composed of an upper mold 37B and a lower mold 39B.
The resin mold 21B formed of ABS resin or the like is used for low-pressure injection molding using the micro molding machine 13 provided with the low-pressure injection device 40 shown in FIG. The upper die 37B and the lower die 39B include a harness housing portion 45B for housing an intermediate portion of the corrugated tube 41A on the upper mold dividing surface 41 and the lower mold dividing surface 43 which are a pair of divided surfaces. In the upper die 37B and the lower die 39B, a cavity 23B is formed on an inner surface 47B that forms the harness housing portion 45B. Further, a clip portion molding portion 53B is attached to the cavity 23B.

  In the cavity 23B of the present embodiment, the opening opposite to the inner surface 47B is closed by the outer periphery of the corrugated tube 17A. The cavity 23B is in a state where both ends in the longitudinal direction of the corrugated tube 17A accommodated in the harness accommodating portion 45B are left open. That is, if the molten thermoplastic resin continues to be supplied, the fluid thermoplastic resin flows out from the open portion. The cavity 23B has a volume larger than the resin amount of the thermoplastic resin for molding the harness mounting part 15B on the inner surface 47B of the harness housing part 45B that houses the corrugated tube 17A.

  A plurality of upper molds 37B and lower molds 39B of the resin mold 21B are arranged so that cavities 23B having different shapes are formed. That is, a plurality of types of upper molds 37B and lower molds 39B having different cavity shapes are prepared for molding different harness mounting parts 15B, and a resin mold 21B selected as necessary is attached to the micro molding machine 13. Different harness mounting parts 15B can be molded.

  The cavity 23B formed in the inner surface 47B of the upper mold 37B and the lower mold 39B shown in FIG. 6 has an inner surface shape that is the outer shape of the harness mounting component 15B (see FIG. 7). The cavity 23B is supplied with a thermoplastic resin having fluidity along the outer periphery of the corrugated tube 17A. 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 through the supply path 25 to the approximate center of the cavity 23 </ b> B.

  When the molten resin is heated, it polymerizes to form a polymer network structure, which is cured and cannot return to its original state. When the molten resin filled in the cavity 23B is cured, the harness mounting component 15B having the clip portion 87A is formed. Molded. Therefore, if the cavity 23B is formed so as to surround the outer periphery of the corrugated tube 17A, the formed harness mounting part 15B is formed in a tube shape for inserting the corrugated tube 17A. The shape of the cavity 23B can be a cylindrical structure, for example. Thereby, as shown in FIG. 7, the harness mounting component 15B which coat | covered the cylindrical tube body 51A on the outer periphery of the corrugated tube 17A is obtained. Since the harness mounting part 15B is formed with the clip portion 87A at the same time, the corrugated tube 17A inserted through the wire harness 17 can be fixed to the vehicle body panel or the like with a predetermined strength via the clip portion 87A.

Further, a cooling mechanism (not shown) for cooling the injection tip of the molten resin injected into the cavity 23B may be provided in the vicinity of both end openings of the harness housing portion 45B in the resin mold 21B. The cooling mechanism is provided outside the resin mold 21B corresponding to the opening portions at both ends, for example.
In the resin mold 21B of the present embodiment, at least the mold temperature in the vicinity of both end openings of the harness housing part 45B is equal to or lower than the resin melting temperature at which the molten resin has fluidity. That is, the mold temperature in the vicinity of the supply path 25B of the resin mold 21B may be heated to a temperature equal to or higher than the resin melting temperature by heating with a heating means such as a heater as necessary in order to allow the molten resin to flow into the cavity 23B. However, no heating means is provided in the vicinity of the opening portions at both ends of the harness housing portion 45B, and the mold temperature is equal to or lower than the resin melting temperature. In some cases, it is cooled by the cooling mechanism as described above.
That is, the molten resin that has flowed into the cavity 23B is deprived of heat by the resin mold 21B and loses its fluidity and is cured. By curing the molten resin, the harness mounting component 15B having the inner shape of the cavity 23B as an outer shape is formed on the outer periphery of the corrugated tube 17A. Therefore, the harness mounting component 15B is molded on the outer periphery of the corrugated tube 17A.

Therefore, the resin mold 21B according to the present embodiment has a simple structure, and the manufacturing cost of the mold can be reduced. Further, even if the outer diameter of the corrugated tube 17A accommodated in the harness accommodating portion 45B changes somewhat, the molten resin does not flow out from the opening portions at both ends of the resin mold 21B, so that the corrugated tube 17A can be flexibly changed in diameter. It can correspond to.
The harness mounting part 15B molded in the middle part of the corrugated tube 17A is somewhat disturbed in the molding shape in the part corresponding to the vicinity of both ends of the harness housing part 45B in the cavity 23B, but in the center of the cavity 23B. In the corresponding part, the molding is completed in a shape that can exhibit its function, and the purpose of molding is achieved.
Therefore, according to the molding method of the corrugated tube 17A according to the present embodiment, it is possible to eliminate the need for a structure or member for sealing the molten resin at the opening end of the resin mold 21B through which the corrugated tube 17A is inserted. it can. As a result, an inexpensive corrugated tube 17A provided with a high-quality harness mounting part 15B can be obtained.

13 ... Micro molding machine 15 ... Harness mounting part 17 ... Wire harness 21 ... Resin mold (molding mold)
23 ... Cavity 25 ... Supply path 37 ... Upper mold 39 ... Lower mold 40 ... Low pressure injection device 41 ... Upper mold dividing surface (divided surface)
43 ... Lower mold dividing surface (dividing surface)
45 ... harness accommodating portion 47 ... inner surface 49 ... molten resin (thermoplastic resin)
67 ... Both ends opening 85 ... Cooling mechanism

Claims (4)

A harness housing portion that is formed on a pair of split surfaces and that accommodates an intermediate portion of a long wire harness member, and a thermoplastic resin that is formed on the inner surface of the harness housing portion and that forms a harness mounting component. A harness housing step of housing an intermediate portion of the wire harness member in the harness housing portion in a set of molds including a cavity having a volume larger than the resin amount;
At least low pressure injection of the thermoplastic resin melted in the mold having a mold temperature in the vicinity of the opening at both ends of the harness housing portion equal to or lower than the resin melting temperature of the thermoplastic resin is made from a supply path provided in the approximate center of the cavity. Resin injection process;
A method of molding a wire harness member, comprising:   2. The wire harness according to claim 1, wherein a cooling mechanism for cooling an injection tip of the thermoplastic resin injected into the cavity is provided in the vicinity of both end openings of the harness housing portion in the mold. Method of molding the member.   The wire harness manufactured by the molding method of the wire harness member of Claim 1 or 2.   An electric wire protection member manufactured by the molding method for a wire harness member according to claim 1 or 2.

Images