JP2008018692A - Molding apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a molding apparatus which keeps structure and work sequence simple, and is also applicable to molding a mold part with a lead whose cross section and external diameter are not consistent. <P>SOLUTION: The molding apparatus 1 includes a bottom mold 10 and a top mold 20 each having cavities 11, 21 and peripheral side parts 12, 22 encircling them. The peripheral side part 12 has a receiving hole 15 to receive resilient members 41, the receiving hole 15 having peripheral walls 27. The front wall 27a and the back wall 27a of the peripheral wall 27 have recess 27e so that a litz wire 32 goes through it in the closed form. The resilient member 41 protrudes beyond the peripheral wall 27 into the closing direction in the open form. In the closed form, the counter resilient members 41, 43 and 42, 44 being compressed in contact with each other in the opening and closing directions, the recess 27e is sealed and the litz wires 32 and 33 are clamped therein. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a mold apparatus for molding a molded part with a leader line, and in particular, enables prevention of mold resin outflow while protecting the leader line.

  In molding of a molded part with a leader line having a leader line such as a litz wire, it is required to prevent damage to the leader line due to mold resin outflow from the leader line part and pinching during mold clamping. As a countermeasure, a technique using a plastic collar is known. Here, it installs in the state which covered the base end vicinity of the litz wire pulled out from the mold component main body in the open mold apparatus, and removes this collar after shaping | molding.

In addition, for example, a technique using an elastic member is known for molding a terminal connection portion such as a covered electric wire with a mold resin (see, for example, Patent Document 1). Here, in the mold apparatus, a portion where a leader line is drawn is opened, and two rubber members facing vertically are installed in the opening portion. In the closed state, molding is performed with the covered electric wire held between the elastic members. Further, an urging means is provided outside the rubber member. By pressing the rubber member inward during molding by this urging means, movement and damage of the rubber member due to pressure during molding are prevented.
JP 2001-162647 A

  However, the above-described technique has the following problems. That is, in the technique using the collar, the work process becomes complicated because the work for attaching and removing the collar is required. In addition, a lead wire whose cross-sectional shape or outer diameter is not constant, such as a litz wire formed by twisting a plurality of conductors, has a gap between the collar and it is difficult to reliably prevent the resin from flowing out.

  Further, in the technique of installing the rubber member in the mold, a separate urging means is used to cope with the pressure in the outer direction, so that the molding apparatus and the work process become complicated. In addition, here, a rubber member formed so as to be in close contact with the periphery of the covered electric wire is used. However, since the cross-sectional shape such as a litz wire and the shape of the lead wire whose outer diameter is not constant cannot be surely matched. It was difficult to apply in some cases.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a mold apparatus that is simple in structure and work procedure, and that can cope with molding of a molded part having a leader line whose cross-sectional shape and outer diameter are not constant.

  A mold apparatus according to an example of the present invention is a mold apparatus for molding a mold part including a main body part and a lead line drawn from the main body part, and includes at least two molds that open and close each other. Each of the two molds includes a cavity in which the main body portion is disposed and a side portion that surrounds the cavity, and is elastically deformable at a position in the side portion where the leader line is disposed. An accommodation portion for accommodating the configured elastic member is formed, and the accommodation portion includes a peripheral wall having an outer wall that supports at least the outer side of the elastic member, and the side portions of the two molds are in contact with the peripheral wall. A concave portion through which the lead wire passes in the closed state is formed, and the elastic member protrudes in the closing direction in which the mold is closed from the peripheral wall in the open state in which the two molds are separated from each other, In the closed state, In a state in which serial two of the elastic members between which are provided in the mold is compressed in contact with each other in the closing direction, with closing the recess, characterized in that sandwich the lead wire.

  In addition to the above, in the mold apparatus according to another example of the present invention, a relief portion capable of accommodating the end portion of the elastic member compressed in the closed state is formed inside the accommodation portion. Features.

  A mold apparatus according to another example of the present invention is characterized in that, in addition to the above, the elastic member is made of a stretchable fluorine-based resin material.

  A mold apparatus according to another example of the present invention is characterized in that, in addition to the above, the elastic member is screwed to the housing portion.

  According to the mold apparatus according to the present invention, it is possible to reliably realize leader line protection and resin outflow prevention with a simple configuration and work procedure, and to cope with a leader line whose cross-sectional shape and outer diameter are not constant. Can do.

  Hereinafter, the configuration of the mold apparatus 1 according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 5. 1, 3 and 4 schematically show an open state of the mold apparatus 1 according to the present embodiment. 2 and 5 schematically show the closed state. In each drawing, the configuration is appropriately enlarged, reduced and omitted. In each figure, three directions, front, back, left, right, up and down, orthogonal to each other are indicated by arrows.

  The mold apparatus 1 includes a lower mold 10 as a fixed mold and an upper mold 20 as a movable mold. The upper mold 20 moves forward and backward relative to the lower mold 10 between an open state and a closed state by a mold clamping mechanism (not shown). By this movement, mold closing, mold clamping, and mold opening are performed.

  The litz wire coil 30 before forming includes a coil body 31 as a main body portion and litz wires 32 and 33 as lead lines drawn out from the coil body 31. The coil body 31 is configured by assembling a bobbin, a coil, and a core, for example.

  The lower mold 10 is made of, for example, a metal material having excellent heat resistance, and includes a lower cavity 11 formed at the center of the upper surface as an example of the cavity, and a lower part as an example of a peripheral side portion surrounding the front, rear, left, and right of the lower cavity 11. And a peripheral side portion 12. A coil main body 31 is disposed in the lower cavity 11, and a lead line is installed on the front side portion 12 a located on the front side in FIG. 1 in the upper surface of the lower peripheral side portion 12.

  A first engaging convex portion 13 and a second engaging convex portion 14 are formed on the upper surface of the front side portion 12a. The first engagement convex portion 13 and the second engagement convex portion 14 are a first accommodation hole 15 and a second accommodation hole 16 as an example of an accommodation portion that accommodates the first elastic member 41 and the second elastic member 42, respectively. have. The front, rear, left and right sides of the first accommodation hole 15 and the second accommodation hole 16 are surrounded by a first peripheral wall 17 and a second peripheral wall 18, respectively. The first peripheral wall 17 includes a front wall 17a, a rear wall 17b, a right wall 17c, and a left wall 17d, and the first elastic member 41 is supported by these. Similarly, the second peripheral wall 18 includes a front wall 18a, a rear wall 18b, a right wall 18c, and a left wall 18d, and the second elastic member 42 is supported by these.

  The outer surface (left side surface) of the left wall 17d that supports the left side of the first elastic member 41 is formed in a curved surface that is curved so as to be positioned outward as it goes downward. The outer surface (right side surface) of the right wall 18c that supports the right side of the second elastic member 42 forms an inclined surface that is inclined so as to be located outward as it goes downward.

  The upper mold 20 includes an upper cavity 21 as an example of a cavity formed in the center of the lower surface, and an upper peripheral side portion 22 as an example of a peripheral side portion surrounding the front, rear, left and right periphery of the upper cavity 21. In the closed state, the upper portion of the coil body 31 is located in the upper cavity 21. Moreover, a leader line is installed in the front side part 22a located ahead among the upper peripheral side parts 22 formed in the front, rear, left and right. The lower surface of the upper peripheral side portion 22 is formed so as to fit with the upper surface of the lower peripheral side portion 12.

  A first engagement recess 23 that fits with the first engagement protrusion 13 in the closed state is formed on the left side of the lower surface of the front side portion 22a. Further, a second engagement recess 24 that fits with the second engagement protrusion 14 in the closed state is formed on the lower right side of the front side portion 22a. At the bottoms of the first engagement recess 23 and the second engagement recess 24, a third accommodation hole 25 and a fourth accommodation hole as an example of an accommodation portion for accommodating the third elastic member 43 and the fourth elastic member 44, respectively. 26 is formed.

  Moreover, the inner surface rear side 23a on the left side of the first engagement recess 23 is formed to protrude to the right side from the inner surface front side and constitutes a step portion in the front-rear direction. The inner surface rear side 23a is formed in a curved surface curved so as to be positioned outward as it goes downward. In the closed state, the inner rear surface 23 a comes into contact with the outer surface of the left wall 17 d of the first peripheral wall 17. The right inner surface 24a of the second engagement recess 24 forms a slope that is inclined so as to be located outward as it goes downward. In the closed state, the outer surface of the right wall 18c of the second engagement convex portion 14 comes into contact with the right inner surface 24a.

  The front, rear, left and right of the third housing hole 25 and the fourth housing hole 26 are surrounded by a third peripheral wall 27 and a fourth peripheral wall 28, respectively. The third peripheral wall 27 includes a front wall 27a, a rear wall 27b, a right wall 27c, and a left wall 27d, and the third elastic member 43 is supported by these. Similarly, the fourth peripheral wall 28 includes a front wall 28a, a rear wall 28b, a right wall 28c, and a left wall 28d, and the fourth elastic member 44 is supported by these.

  A front wall 17a as an outer wall positioned on the front side of the elastic members 41 to 44, that is, on the outside of the cavity portion, of the four peripheral walls 13, 14, 23, 24 formed on the left and right of the upper mold 20 and the lower mold 10, Recesses 17e, 18e, 27e, and 28e into which leader lines can be inserted are formed in 18a, 27a, and 28a. In addition, recesses 17e, 18e, 27e, and 28e through which leader lines can be inserted are formed in the rear walls 17b, 18b, 27b, and 28b as inner walls that are the inside as viewed from the cavity. The depths of the recesses 17e, 18e, 27e, and 28e are larger than the maximum radius of the litz wires 32 and 33, and the litz wire 32 is between the upper recesses 27e and 28e and the lower recesses 17e and 18e in the closed state. 33 can be inserted.

  Furthermore, at the end of each peripheral wall 17, 18, 27, 28, a relief portion 15a whose inner surface is formed in a slope shape so that the inside of each accommodation hole 15, 16, 25, 26 expands in a tapered shape. 16a, 25a, and 26a are provided. When the end portion of the elastic member is compressed in the closed state, the elastic member is accommodated in the escape portions 15a, 16a, 25a, and 26a.

  As shown in FIGS. 4 and 5, screw holes 15c, 16c, 25c, and 26c are formed in the bottom portions 15b, 16b, 25b, and 26b of the receiving holes 15, 16, 25, and 26, respectively. The receiving holes 15, 16, 25, 26 and the elastic members 41 to 44 are respectively fitted and screwed into the screw holes 15c, 16c, 25c, 26c. The elastic members 41 to 44 are formed in a plate shape from a fluorine-based resin material having a heat resistant temperature of 280 to 300 ° C., a pressure resistance of 100 to 180 MPA, and a hardness (Asker) of 50 to 90 degrees. The elastic members 41 to 44 have a function of closing the recesses 17e, 18e, 27e, and 28e. The upper surface of the first elastic member 41 protrudes slightly upward (closed direction) from the upper end portion of the first peripheral wall 17, and the upper surface of the second elastic member 42 is slightly higher than the upper end surface of the second peripheral wall 18 (close direction). ). Similarly, the third elastic member 43 and the fourth elastic member 44 also protrude slightly downward (in the closing direction) from the lower end surfaces of the respective peripheral walls 27 and 28. The amount of protrusion of the elastic members 41 to 44 from the peripheral walls 17, 18, 27, and 28 is about 0.5 mm, and the protrusions compressed the elastic members 41 to 44 in the opening / closing direction (vertical direction) in the closed state. It becomes a state. As shown in FIG. 3, the upper mold 20 is formed with an injection gate 29 that communicates with the upper cavity 21. By injecting the resin in a closed state via the injection gate 29, the resin can be filled into the cavity portion formed of the lower cavity 11 and the upper cavity 21.

Next, a molding procedure using the mold apparatus 1 according to the present embodiment will be described.
In a state where the elastic members 41 to 44 are screwed in advance and supported by the peripheral walls 17, 18, 27, 28, the coil body 31 is set in a half-assembled state in the cavity of the lower mold 10 in the opened state. The first litz wire 32 drawn out from the coil body 31 is disposed on the first elastic member 41 located in the recess 17e. Similarly, the second litz wire 33 is disposed on the second elastic member 42 located in the recess 18e.

  Next, the upper mold 20 is lowered by a mold clamping device (not shown). At this time, the outer surface of the left wall 17d of the first engaging recess 23 is in contact with and guided by the curved inner surface rear surface 23a of the first engaging convex portion 13, and the upper peripheral side portion 22 and the lower peripheral side portion 12 Are combined with each other. Further, the sloped right inner surface 24a of the second engagement recess is guided to the sloped right wall 18c of the second engagement projection. At this time, the elastic members 41 to 44 are elastically deformed according to the cross-sectional shape and the outer diameter of the litz wires 32 and 33, and the first elastic member 41, the third elastic member 43, the second elastic member 42, and the second elastic member that face each other. The four elastic members 44 come into contact with each other and are compressed in the vertical direction. In the closed state shown in FIGS. 2 and 5, the upper peripheral side portion 22 and the lower peripheral side portion 12 are in contact with each other. Further, the first engaging convex portion 13 is located inside the first engaging concave portion 23, and the second engaging convex portion 14 is located inside the second engaging concave portion 24. The first litz wire 32 passes through an opening formed by the recesses 17e and 27e while being sandwiched between the first elastic member 41 and the third elastic member 43. Similarly, the second litz wire 33 passes through the opening formed by the recesses 18e and 28e while being sandwiched between the second elastic member 42 and the fourth elastic member 44. At this time, the opening formed of the recesses 17e and 18e is closed by the elastic members 41 and 43. Further, the opening formed of the recesses 27e and 28e is closed by the elastic members 42 and 44. The protruding portions of the compressed elastic members 41 to 44 are located in the escape portions 15a, 16a, 25a, and 26a. The elastic members 41 to 44 are elastically deformed according to the shape of the litz wires 32 and 33, respectively, and cover the periphery of the litz wires 32 and 33 without any gap, thereby sealing the cavity from the outside.

  In this closed state, molten mold resin is injected through the injection gate 29. As a result, the mold resin covers the coil body 31 and spreads into the cavity portion formed by the upper cavity 21 and the lower cavity 11 without a gap. Next, the mold resin is cured by cooling, and is formed into a predetermined shape while covering the coil body 31. Thus, the litz wire coil 30 is completed.

  The mold apparatus 1 according to the present embodiment has the following effects.

  The recesses 17e, 18e, 27e, and 28e are formed in the peripheral walls 17, 18, 27, and 28 of the elastic member accommodation holes so that the litz wires 32 and 33 can be inserted. It is not sandwiched between the lower peripheral side portion 12 and the upper peripheral side portion 22. Therefore, it is possible to prevent the litz wires 32 and 33 from being damaged at the time of mold clamping and to maintain good electrical characteristics.

  Further, by holding the Litz wires 32 and 33 with the elastic members 41 to 44 made of a fluororesin material having excellent elasticity and heat resistance, it is highly sealed by elastically deforming according to the shape of the Litz wires 32 and 33. It becomes possible to maintain sex. Therefore, resin outflow can be effectively prevented even when used for a lead wire having a non-constant cross-sectional shape and outer diameter. Furthermore, by projecting the elastic members 41 to 44 in the open state and molding them in a state compressed in the opening and closing direction over the entire surface, it is possible to prevent movement with pressure from the inside due to a strong pressing force in the vertical direction, Further, since the opposing elastic members 41 and 43 and the elastic members 42 and 44 are in contact with each other without any gap, it is effective for preventing resin outflow.

  Furthermore, since it is configured to withstand the pressure from the inside applied during molding due to the presence of the front walls 17a, 18a, 27a, and 28a as outer walls, there is no need for a separate means for pressing and energizing the mold. The structure of the device 1 can be simplified. Further, the first engagement convex portion 13, the second engagement convex portion 14, the first engagement concave portion 23, the second engagement concave portion 24, the step portion formed by the inner surface rear surface 23a, etc. Since the upper mold 20 and the lower mold 10 are configured to be locked to each other, positional displacement can be prevented and high pressure during molding can be dealt with. Furthermore, the engagement convex portions 13 and 14 and the engagement concave portions 23 and 24 have a part of the outer surface formed into a curved surface or an inclined surface, thereby enabling smooth opening and closing with a simple configuration.

  In carrying out the present invention, it goes without saying that the constituent elements of the present invention, such as the material and specific shape of each constituent member, can be variously changed without departing from the gist of the invention.

For example, in the above embodiment, the case where the litz wire coil 30 is applied as a molded product has been illustrated. However, the mold apparatus according to the present invention can be used for molding various other molded parts with lead wires. Moreover, although illustrated about the case where there are two litz wires, any number can be applied.
Of course, various modifications can be made without departing from the scope of the present invention.

The perspective view which shows an open state, when accommodating the litz wire coil of the metal mold | die apparatus concerning 1st Embodiment of this invention. The perspective view which shows the closed state at the time of accommodating the litz wire coil of the metal mold | die apparatus. The side view which shows the open state in the case of accommodating the litz wire coil of the metal mold | die apparatus. The front view which shows the open state in the case where the litz wire coil of the metal mold | die apparatus is not accommodated. The front view which shows the closed state in the case where the litz wire coil of the metal mold | die apparatus is not accommodated.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Mold apparatus, 10 ... Lower mold, 11 ... Lower cavity (cavity), 12 ... Lower peripheral side part, 20 ... Upper mold, 21 ... Upper cavity (cavity), 22 ... Upper peripheral side part (circumferential side part) ,
15.16.25.26 ... accommodation hole (accommodating part), 17.18.27.28 ... peripheral wall, 17a. 18a. 27a. 28a ... front wall (outer wall), 17e. 27e. 18e. 28e ... recess, 30 ... litz wire coil, 31 ... coil body (main body), 32.33 ... litz wire (leader),
41 to 44: elastic members.

Claims (4)

A mold apparatus for molding a molded part having a main body part and a lead line drawn from the main body part,
With at least two molds that open and close each other,
Each of the two molds includes a cavity in which the main body portion is disposed, and a side portion surrounding the cavity,
In the side portion, a housing portion that houses an elastic member configured to be elastically deformable is formed at a position where the lead wire is disposed,
The accommodating portion includes a peripheral wall having an outer wall that supports at least the outer side of the elastic member,
In the closed state where the side portions of the two molds are in contact with each other on the peripheral wall, a recess is formed through which the lead wire passes,
The elastic member protrudes in a closing direction in which the mold closes, rather than the peripheral wall, in an open state where the two molds are separated from each other.
In the closed state, the elastic members provided respectively in the two molds are in contact with each other in the opening and closing direction and compressed, and close the recess and sandwich the lead wire. Mold equipment to do.   2. The mold apparatus according to claim 1, wherein an escape portion capable of accommodating an end portion of the elastic member compressed in the closed state is formed inside the accommodation portion. The mold apparatus according to claim 1, wherein the elastic member is made of a stretchable fluorine-based resin material.   The mold apparatus according to claim 1, wherein the elastic member is screwed to the housing portion.

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