JP4054193B2 - Solenoid manufacturing apparatus and manufacturing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a manufacturing apparatus and a manufacturing method for a solenoid.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a solenoid of a type that energizes a coil wound around the outer periphery of a spool through a terminal is known. In this solenoid, a base end portion of a terminal is connected to a coil, a concave portion such as a connector is opened outside a resin molding member covering the spool, the coil, and the terminal, and a distal end portion of the terminal projects into the concave portion.
[0003]
[Problems to be solved by the invention]
The solenoid is manufactured by insert molding a spool, a coil, and a terminal with resin. For this insert molding, a molding die 1 as shown in FIG. 7 is used. The molding die 1 protrudes into the cavity 2 in a shape corresponding to the inner shape of the concave portion of the resin molding member, and a cavity forming portion 3 that forms the cavity 2 in a shape corresponding to the outer shape of the resin molding member. And a projection 7 that forms an insertion hole 6 into which the portion 5a is inserted. In order to manufacture a solenoid using the molding die 1, as shown in FIG. 7, the tip 5 a of the terminal 4 is inserted into the insertion hole 6, the spool, the coil, and the terminal 4 are accommodated in the cavity 2, and then the cavity 2 Resin material is injected into At this time, there is a problem that the terminal 4 is moved and deformed by the injection pressure of the resin material due to the distal end portion 5a of the terminal 4 being loosely inserted into the insertion hole 6. In particular, in the case of the terminal 4 having a shape in which the distal end portion 5a is bent with respect to the proximal end portion 5b as shown in FIG. 7, the distal end portion 5a is pulled out from the insertion hole 6 by the injection pressure, and the proximal end portion 5b is easily bent in the withdrawal direction X. . In that case, the amount of protrusion of the tip 5a into the recess becomes short, resulting in a product defect.
The objective of this invention is providing the manufacturing apparatus and manufacturing method of the solenoid which prevent a deformation | transformation of a terminal.
[0004]
[Means for Solving the Problems]
According to the solenoid manufacturing apparatus of the first aspect of the present invention, the molding die has the holding portion, and the holding portion protrudes into the cavity in a shape corresponding to the inner shape of the concave portion of the resin molding member. When the distal end portion of the terminal is inserted into the insertion hole, the distal end portion of the terminal is pushed and elastically deformed, and the distal end portion of the terminal is held by the elastic force. Therefore, the movement of the terminal due to the injection pressure can be suppressed by injecting the resin material into the cavity of the molding die in a state where the distal end portion of the terminal is inserted into the insertion hole of the protrusion and held by the holding portion. Therefore, deformation of the terminal can be prevented.
[0005]
According to the solenoid manufacturing apparatus of the second aspect of the present invention, the holding portion brings the tip of the terminal into pressure contact with the inner wall of the protrusion forming the insertion hole by an elastic force. Thereby, the retention strength of a terminal front-end | tip part can be obtained with a simple structure.
According to the solenoid manufacturing apparatus of the third aspect of the present invention, the holding portion sandwiches the distal end portion of the terminal by applying an elastic force to the distal end portion of the terminal from both sides of the extending shaft. Thereby, the retention strength of a terminal front-end | tip part can be obtained with a simple structure.
[0006]
According to the solenoid manufacturing apparatus of the fourth aspect of the present invention, since the holding portion is constituted by a leaf spring, a relatively large holding force can be obtained with a small amount of elastic deformation.
According to the solenoid manufacturing apparatus of the fifth aspect of the present invention, the protrusion is constituted by two nested molds formed separately and joined to each other, and the insertion hole is between the two nested molds. The leaf springs that are formed and that constitute the holding portion are interposed between the two nested joint interfaces and project into the insertion hole. Thereby, the shaping | molding die which has a leaf | plate spring as a holding | maintenance part can be formed easily.
[0007]
According to the solenoid manufacturing apparatus of the sixth aspect of the present invention, since the solenoid having the terminal formed in the shape in which the distal end portion is bent with respect to the base end portion is manufactured, the effect of preventing the terminal deformation by the holding portion is sufficiently obtained. Can enjoy.
According to the solenoid manufacturing method described in claim 7 of the present invention, using the solenoid manufacturing apparatus described in any one of claims 1 to 6, the tip of the terminal is placed on the molding die prior to insert molding. Insert it into the insertion hole and hold it in the holding part. Therefore, it is possible to prevent the terminal from being deformed by the injection pressure when the resin material is injected into the cavity.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a plurality of examples showing embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
A solenoid manufacturing apparatus (hereinafter referred to as a solenoid manufacturing apparatus) according to a first embodiment of the present invention is shown in FIGS. The solenoid manufacturing apparatus is an apparatus for manufacturing the solenoid 100 shown in FIG. 4 by insert molding.
[0009]
First, the solenoid 100 will be described. The solenoid 100 includes a spool 101, a coil 102, a core 103, a terminal 104, and a resin molding member 106. The spool 101 is formed of a resin material in a cylindrical shape. The coil 102 is wound around the spool 101. The core 103 is formed of a magnetic material in a cylindrical shape, and is fitted to the inner peripheral side of one end of the spool 101. The terminal 104 is made of a conductive material, and has a shape in which a distal end portion 105a is bent with respect to a proximal end portion 105b. A base end portion 105 b of the terminal 104 is connected to the coil 102. The resin molding member 106 is formed of a resin material in a substantially cylindrical shape, and covers the coil 102, the spool 101, the core 103, and the terminal 104. The resin molding member 106 has a connector 107 at its coil side end. The connector 107 is formed with a recess 108 that opens to the outside of the resin molded member 106. The tip end portion 105 a of the terminal 104 protrudes into the recess 108 of the connector 107. The flange portion 109 of the core 103 protrudes on the outer peripheral side of the resin molded member 106.
[0010]
Next, the solenoid manufacturing apparatus will be described. The solenoid manufacturing apparatus includes a molding die 12 shown in FIGS. The molding die 12 includes an upper die 13, a lower die 14, a pin member 16, a first nested die 17, a second nested die 18, and a leaf spring 20 as a holding portion. As shown in FIG. 2, the upper die 13 and the lower die 14 are matched with each other to form a cavity 15 therebetween. The cavity 15 is formed in a shape corresponding to the outer shape of the resin molded member 106. The cavity 15 can accommodate an insert part 110 (see FIG. 2) in which the spool 101, the coil 102, the core 103, and the terminal 104 are integrated in advance. A gate 22 is formed in the upper mold 13 so as to communicate with the cavity 15 and guide a resin material injected from an injection machine (not shown) to the cavity 15. The flange portion 109 of the core 103 in the insert part 110 is fitted to the fitting portions 23 and 24 provided in the upper die 13 and the lower die 14 respectively. The upper mold 13 and the lower mold 14 constitute a “cavity forming portion” described in the claims. The cylindrical pin member 16 is sandwiched between the upper mold 13 and the lower mold 14 and protrudes into the cavity 15. The protruding end of the pin member 16 is inserted into the spool 101 of the insert part 110 from the non-core side.
[0011]
As shown in FIG. 3, the first nested mold 17 is formed in a rectangular cylindrical shape. The second nested mold 18 is formed in a rectangular column shape, and is fitted and fixed to the inner peripheral side of the first nested mold 17. An insertion hole 28 is formed between one inner peripheral wall portion 26 of the first insert mold 17 and one outer peripheral wall portion 27 of the second insert mold 18. The insertion hole 28 opens to one end portions 29 and 30 of the telescopic molds 17 and 18 and extends in the central axis direction of the telescopic molds 17 and 18. The insertion hole 28 is formed in a size that allows the distal end portion 105a of the terminal 104 of the solenoid 100 to be inserted. The inner peripheral wall portion 26 of the first insert mold 17 is recessed at a portion forming the opposite end of the insertion hole 28 to form a step. As a result, the cross-sectional area of the insertion hole 28 is made larger on the side opposite to the opening than on the opening side, and the elastic deformation of the leaf spring 20 protruding at the end opposite to the opening of the insertion hole 28 is allowed. The opposite opening side of the first nested mold 17 is fitted and fixed to the lower mold 14, and the opening side end 29 of each nested mold 17, 18 is inserted into the cavity 15 formed by the upper mold 13 and the lower mold 14. 30 protrudes. The outer wall of the opening side end portion 29 of the first telescoping mold 17 is formed in a shape corresponding to the inner shape of the concave portion 108 of the solenoid 100. The opening-side end portions 29 and 30 of the telescopic molds 17 and 18 constitute “projections” described in the claims.
[0012]
The leaf spring 20 is formed in a substantially rectangular flat plate shape. The leaf spring 20 is interposed on the one end portion 31 side in the longitudinal direction at the joining interface between the inner peripheral wall portion 26 of the first insert mold 17 and the outer peripheral wall portion 27 of the second insert mold 18. The other end 32 in the longitudinal direction of the leaf spring 20 protrudes to the end opposite to the opening of the insertion hole 28 and is curved toward the outer peripheral wall 27 of the second telescopic mold 18. A gap is formed between the protruding end portion 32 of the leaf spring 20 and the outer peripheral wall portion 27 of the second telescopic die 18 so that the tip end portion 105a of the terminal 104 can enter. As shown in FIG. 1, when the distal end portion 105 a of the terminal 104 is inserted into the insertion hole 28, the protruding end portion 32 of the leaf spring 20 is the distal end portion 105 a of the terminal 104 and the inner peripheral wall portion 26 of the first telescoping mold 17. It is pushed to the side and elastically deforms. The elastic force generated by the elastic deformation acts on the distal end portion 105 a of the terminal 104 from the protruding end portion 32 of the leaf spring 20, so that the distal end portion 105 a is pressed against the outer peripheral wall portion 27 of the second telescopic mold 18. As long as the terminal 104 pressed against the second insert mold 18 is not applied with a force of a predetermined magnitude or more in accordance with the elastic coefficient of the leaf spring 20 in the direction of withdrawal from the insertion hole 28 (indicated by X in FIG. 1), It is held so that it cannot escape. In the narrow space of the insertion hole 28, the leaf spring 20 can obtain a relatively large elastic force, that is, a large terminal holding force with a small amount of elastic deformation. The outer peripheral wall portion 27 of the second insert mold 18 constitutes the “inner wall forming the insertion hole” recited in the claims.
[0013]
In this way, the insertion hole 28 is formed by two nesting molds, and the holding portion protruding from the insertion hole 28 can be provided only by interposing the one end 31 of the leaf spring 20 at the joining interface between the two nesting molds 17 and 18. It can be easily realized. Moreover, since the leaf | plate spring 20 is used as a holding | maintenance part, the structure of the shaping die 12 is simplified.
[0014]
Next, a method for manufacturing the solenoid 100 using the solenoid manufacturing apparatus will be described.
(1) The upper mold 13 and the lower mold 14 are opened, and the pin member 16 is inserted into the spool 101 of the insert part 110.
(2) Insert the distal end portion 105a of the terminal 104 into the insertion hole 28 while fitting the flange portion 109 of the core 103 of the insert part 110 to the fitting portion 24 of the lower die 14 and holding the pin member 16 on the lower die 14. To do. As shown in FIG. 1, the distal end portion 105a of the terminal 104 inserted into the insertion hole 28 is pressed against the outer peripheral wall portion 27 of the second nested mold 18 by the protruding end portion 32 of the leaf spring 20 that is elastically deformed by the insertion. And retained.
(3) The upper die 13 and the lower die 14 are matched while fitting the flange portion 109 of the core 103 to the fitting portion 23 of the upper die 13, and the pin member 16 is interposed between the upper die 13 and the lower die 14. Hold it. Thereby, the cavity 15 is formed, and the insert part 110 is accommodated in the cavity 15.
(4) A resin material is injected into the cavity 15 through the gate 22 by an injection machine, and the resin molding member 106 is molded.
[0015]
According to the above-described method, since the distal end portion 105a of the terminal 104 inserted into the insertion hole 28 is held by the leaf spring 20 and the resin material is injected into the cavity 15, the elastic coefficient of the leaf spring 20 is appropriately set. Thus, the movement of the terminal 104 due to the injection pressure can be suppressed. Therefore, it is possible to prevent the distal end portion 105a of the terminal 104 from coming out of the insertion hole 28 and the base end portion 105b from being bent and deformed in the withdrawal direction X.
[0016]
(Second embodiment)
A molding die of the solenoid manufacturing apparatus according to the second embodiment of the present invention is shown in FIGS. The solenoid manufacturing apparatus according to the second embodiment is an apparatus for manufacturing the solenoid 100 shown in FIG. 4 by insert molding, as in the case of the first embodiment. In the following description, substantially the same components as those in the first embodiment are denoted by the same reference numerals.
[0017]
The molding die 52 has two leaf springs 60 as holding parts. One end 61, 61 in the longitudinal direction of each leaf spring 60, 60 has an inner peripheral wall portion 26 of the first telescopic die 17 and an outer peripheral wall portion 64 of the second telescopic die 18 so as to sandwich the hook piece 63 therebetween. It is interposed at the joint interface. The other end portions 62, 62 in the longitudinal direction of the leaf springs 60, 60 protrude at the opposite end of the insertion hole 28 and are curved toward each other. Between the projecting ends 62 and 62 of the leaf springs 60 and 60, a gap is formed through which the tip end portion 105 a of the terminal 104 can enter. The outer peripheral wall portion 64 of the second insert mold 18 is recessed at the portion that forms the opposite end of the insertion hole 28 in the same manner as the inner peripheral wall portion 26 of the first insert mold 17 to form a step. Due to the respective recesses in the inner peripheral wall 26 of the first insert mold 17 and the outer peripheral wall portion 64 of the second insert mold 18, the cross-sectional area of the insertion hole 28 is made larger on the side opposite to the opening than on the opening side. Elastic deformation is allowed. As shown in FIG. 5, when the distal end portion 105 a of the terminal 104 is inserted into the insertion hole 28 and enters the gap, the protruding end portions 62 and 62 of the leaf springs 60 and 60 are the first nests at the distal end portion 105 a of the terminal 104. The mold 17 is pushed and elastically deformed by the inner peripheral wall portion 26 side of the mold 17 and the outer peripheral wall portion 64 side of the second nested mold 18. When the elastic force generated by the elastic deformation of each leaf spring 60, 60 acts on the distal end portion 105 a of the terminal 104 from both sides of the extension shaft, the distal end portion 105 a is sandwiched between the two leaf springs 60, 60. The terminal 104 sandwiched between the two leaf springs 60, 60 causes a force of a predetermined magnitude or more according to the elastic coefficient of each leaf spring 60, 60 in the direction of withdrawal from the insertion hole 28 (indicated by X in FIG. 5). Unless it is added, it will be kept inaccessible. Thus, a large terminal holding force can be easily obtained by using the two leaf springs 60 and 60.
[0018]
With the above configuration, the elastic coefficients of the leaf springs 60, 60 are set as appropriate, and the tip portion 105a of the terminal 104 is inserted into the insertion hole 28 prior to injecting the resin material into the cavity 15, so that the two leaf springs 60, 60 are inserted. , The movement of the terminal 104 due to the injection pressure can be suppressed. Therefore, it is possible to prevent the distal end portion 105a of the terminal 104 from coming out of the insertion hole 28 and the base end portion 105b from being bent and deformed in the withdrawal direction X.
[0019]
In the above-described plurality of embodiments, the holding portion is configured by the leaf spring 20, but the holding portion may be configured by, for example, a coil spring.
Moreover, in the said Example, the 1st insertion type | mold 17 and the 2nd insertion type | mold 18 as a protrusion are fixed to the lower type | mold 14, and the terminal 104 side is moved and the insertion to the insertion hole 28 of the terminal 104 is implemented. On the contrary, the terminal may be inserted into the insertion hole by fixing the position of the terminal side and moving the projection side.
[0020]
Further, in the above embodiments, the example in which the present invention is applied to the manufacture of the solenoid 100 having the core 103 in addition to the spool 101, the coil 102, the terminal 104, and the resin molded member 106 is shown. Any solenoid having at least a spool, a coil, a terminal, and a resin molding member may be used, and a solenoid without a core, for example, a solenoid having a moving core, a yoke, or the like may be used.
[Brief description of the drawings]
FIG. 1 is a sectional view showing a molding die of a solenoid manufacturing apparatus according to a first embodiment of the present invention.
FIG. 2 is a sectional view showing a solenoid manufacturing apparatus according to a first embodiment of the present invention.
3 is a view showing a combined state of the first insert type, the second insert type, and the leaf spring shown in FIG. 1, wherein (A) is a plan view, and (B) is a BB line in (A). It is sectional drawing.
FIG. 4 is a sectional view showing a solenoid manufactured using the solenoid manufacturing apparatus according to the first and second embodiments of the present invention.
FIG. 5 is a sectional view showing a molding die of a solenoid manufacturing apparatus according to a second embodiment of the present invention.
6 is a cross-sectional view showing a combined state of the first nested type, the second nested type, and two leaf springs shown in FIG. 5. FIG.
FIG. 7 is a cross-sectional view showing a conventional molding die.
[Explanation of symbols]
12, 52 Mold 13 Upper mold (cavity forming part)
14 Lower mold (cavity forming part)
15 Cavity 17 First telescopic mold 18 Second telescopic mold 20, 60 Leaf spring (holding portion)
27 Outer peripheral wall (inner wall of insertion hole)
28 Insertion holes 29, 30 Open side end (projection)
DESCRIPTION OF SYMBOLS 100 Solenoid 101 Spool 102 Coil 103 Core 104 Terminal 105a Front-end | tip part 105b Base end part 106 Resin molding member 107 Connector 108 Recessed part 110 Insert part

Claims (7)

A spool, a coil wound around the outer periphery of the spool, a terminal connected to the coil at a base end portion, and a resin molded member that covers the spool, the coil, and the terminal; A solenoid having a resin-molded member in which the tip of the terminal protrudes in a recess that opens, is manufactured by insert molding,
Equipped with a mold,
The molding die includes a cavity forming portion that forms a cavity that accommodates the spool, the coil, and the terminal in a shape corresponding to the outer shape of the resin molding member, and a shape that corresponds to the inner shape of the recess. Projecting into the cavity and forming an insertion hole into which the tip of the terminal is inserted, and projecting into the insertion hole, and when the tip of the terminal is inserted into the insertion hole, it is pushed by the tip of the terminal And a holding portion for holding the tip end portion of the terminal by the elastic force. 2. The solenoid manufacturing apparatus according to claim 1, wherein the holding portion presses the distal end portion of the terminal against the inner wall of the protrusion forming the insertion hole by the elastic force. The said holding | maintenance part applies the said elastic force to the front-end | tip part of the said terminal from the both sides of the extending | stretching axis | shaft, and clamps the front-end | tip part of the said terminal, The manufacturing apparatus of the solenoid of Claim 1 characterized by the above-mentioned. The said holding | maintenance part is comprised with the leaf | plate spring, The manufacturing apparatus of the solenoid of Claim 1, 2, or 3 characterized by the above-mentioned. The protrusion is composed of two nested types formed separately and joined to each other,
The insertion hole is formed between the two nested molds,
The solenoid manufacturing apparatus according to claim 4, wherein the leaf spring is interposed in the joining interface between the two nested types and protrudes into the insertion hole. The said terminal is formed in the shape where the said front-end | tip part bent with respect to the said base end part, The manufacturing apparatus of the solenoid as described in any one of Claims 1-5 characterized by the above-mentioned. A method for manufacturing the solenoid using the solenoid manufacturing apparatus according to any one of claims 1 to 6,
Inserting the tip of the terminal into the insertion hole and holding it in the holding part, and receiving the spool, the coil and the terminal in the cavity;
Injecting a resin material into the cavity;
The manufacturing method of the solenoid characterized by including.

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