JP6135496B2 - Insert molded product - Google Patents

Description

  The present invention relates to an insert molded product.

  Patent Document 1 discloses a technique for integrally forming an insert molded product by injecting a molten resin into a mold in which an insert sheet metal is set. As an insert molded product of a form different from Patent Document 1, a primary molded product made of synthetic resin is molded in advance, and the primary molded product and a metal member are assembled and set in a secondary molding die. Some are formed by integrating a secondary molded part made of a synthetic resin, a primary molded product, and a metal member.

  An example of a technique for forming the secondary molded part, the primary molded product, and the metal member integrally is shown in FIGS. A space 102 is formed in the primary molded product 101 set in the secondary molding die 100, and in the secondary molding die 100, the metal member 103 is in the space 102 on the surface of the primary molded product 101. It arrange | positions so that the opening part 104 may be plugged up. A positioning recess 105 is formed in a region including the opening 104 in the surface of the primary molded product 101, and the metal member 103 is positioned so as not to be detached from the opening 104 by fitting into the positioning recess 105. . The pressing portion 106 of the secondary molding die 100 presses the surface of the metal member 103 toward the opening 104 and also presses the region near the positioning recess 105 in the surface of the primary molded product 101.

JP 2012-245692 A

A gap 107 (exaggerated in FIGS. 7 and 8) may be generated between the outer surface 103S of the metal member 103 and the inner surface 105S of the positioning recess 105 due to dimensional tolerance. The molten resin (not shown) enters the gap 107 on the side surface. On the other hand, the depth dimension of the positioning recess 105 and the thickness dimension of the metal member 103 may also vary due to dimensional tolerances. Therefore, there is a gap between the bottom surface of the positioning recess 105 and the back surface of the metal member 103 in a state where the pressing portion 106 of the mold 100 for secondary molding presses the surface of the primary molded product 101 and the surface of the metal member 103. If this occurs, the molten resin that has entered the gap 107 on the side surface may pass through the gap on the bottom surface due to the injection pressure and enter the space 102 from the opening 104. If it becomes like this, an insert molded product will become inferior goods.
The present invention has been completed based on the above circumstances, and an object thereof is to prevent molding defects.

The insert molded product of the present invention is
By injecting a molten resin into a secondary molding die in which a primary molded product and a metal member are set, a secondary molded portion, the primary molded product, and the metal member are integrated and molded,
In the primary molded product, a space opened on the surface of the primary molded product, and a positioning recess in a form in which a region including the opening of the space in the surface of the primary molded product is recessed, are formed.
In the secondary molding step, the metal member that is accommodated in the positioning recess and closes the opening is pressed toward the opening by the pressing portion of the secondary molding die, and the outer peripheral surface of the metal member In an insert molded product in which a peripheral surface gap between the inner peripheral surface of the positioning recess and the positioning recess is covered with the pressing portion,
Within the range covered by the pressing portion of the peripheral surface gap, there is a protrusion that contacts the other peripheral surface on at least one peripheral surface of the inner peripheral surface of the positioning recess and the outer peripheral surface of the metal member. Formed,
The peripheral gap is configured to include a pair of side gaps positioned so as to sandwich the opening, and the protrusions are arranged in pairs in the pair of side gaps,
When the positioning recess side is plastically deformed at the abutting portion of the protrusion, the molten resin is located downstream of the protrusion in the flow direction of the molten resin in the region covered with the pressing portion of the circumferential clearance. It is characterized in that resin penetration is restricted.

Even if there is a variation in the facing distance between the inner peripheral surface of the positioning recess and the outer peripheral surface of the metal member, the variation is absorbed by the plastic deformation of the positioning recess at the abutting portion of the protrusion. Intrusion of molten resin into can be reliably prevented. Moreover, compared with the case where the protrusion is disposed only in one of the side surface gaps, the penetration of the molten resin into the circumferential surface gap can be more reliably regulated.

Plan view of the primary molded product of Example 1 Plan view showing the state where the primary molded product and metal member are set in the secondary molding die AA line sectional view of FIG. BB sectional view of FIG. Top view of molded inserts CC sectional view of FIG. Plan view showing a state in which a primary molded product and a metal member are set in a secondary molding die in a conventional example DD sectional view of FIG.

  (1) In the insert molded product of the present invention, the projection may be formed on the inner peripheral surface of the positioning recess. According to this configuration, since the protrusion is easily deformed, the resistance when the metal member is accommodated in the positioning recess can be reduced.

<Example 1>
A first embodiment of the present invention will be described below with reference to FIGS. In the present embodiment, with respect to the front-rear direction, the lower side in FIGS. 1, 2 and 5 is the front, the left-right direction is based on the direction shown in FIGS. The direction that appears in As shown in FIGS. 5 and 6, the insert molded product 10 of the present embodiment is obtained by injecting molten resin (not shown) into a secondary molding die 30 in which the primary molded product 11 and the metal member 20 are set. The secondary molded part 19, the primary molded product 11, and the metal member 20 are integrally molded.

  The primary molded product 11 is made of a synthetic resin, and is molded into a predetermined shape in advance before performing secondary molding. As shown in FIG. 4, the primary molded product 11 integrally includes a flat plate portion 12 that is long in the front-rear direction with the plate surface oriented horizontally and a bulging portion 13 that protrudes downward from the front end portion of the flat plate portion 12. Formed and configured. A space 14 is formed at the front end portion of the primary molded product 11 so as to open to the surface (upper surface) of the flat plate portion 12 and to have the inside of the bulging portion 13 recessed. In the space 14, the compression coil spring 15 whose axis is directed in the vertical direction is accommodated in an elastic state.

  As shown in FIGS. 1 and 3, the primary molded product 11 is formed with a positioning recess 16 in which the surface of the flat plate portion 12 is shallowly recessed. The formation range of the positioning recess 16 at the front end portion of the primary molded product 11 is a region including the opening 17 of the space 14 and the entire peripheral region along the outer peripheral edge of the opening 17. As shown in FIG. 1, the planar view shape of the positioning recess 16 at the front end portion of the primary molded article 11 is a rectangle elongated in the front-rear direction. The left and right inner side surfaces 16S of the positioning recess 16 (inner peripheral surfaces of the positioning recess described in the claims) face each other in parallel with the opening 17 interposed therebetween. Further, the front end of the positioning recess 16 is a front wall surface 16F (inner peripheral surface of the positioning recess described in the claims) that is connected to the front end of the inner surface 16S at a right angle. The depth dimension of the positioning recess 16 is constant.

  The metal member 20 is formed by punching a metal plate material having a predetermined thickness into a predetermined shape, and is called a bus bar and has a function as a conductive path. As shown in FIGS. 2 and 5, the plan view shape of the front end portion of the bus bar is a rectangle that is long in the front-rear direction, like the front end portion of the primary molded product 11 and the front end portion of the positioning recess 16. Accordingly, the left and right outer surfaces 20S (the outer peripheral surfaces of the metal members recited in the claims) at the front end of the metal member 20 are parallel to each other. Further, the front end surface 20F of the metal member 20 (the outer peripheral surface of the metal member recited in the claims) is connected to the front ends of the left and right outer surfaces 20S at a right angle. The thickness dimension of the metal member 20 is the same as the depth dimension of the positioning recess 16. As shown in FIGS. 2 to 4, the metal member 20 is accommodated in the positioning recess 16 in a state of closing the opening 17 of the space 14. The metal member 20 accommodated in the positioning recess 16 is positioned in the left-right direction with respect to the primary molded product 11 (opening 17). By being positioned, the metal member 20 is held in a state of closing the entire region of the opening 17.

  As illustrated in FIGS. 3 and 4, the secondary molding die 30 includes a lower die 31 and an upper die 32 that are opened in the vertical direction. The lower mold 31 is formed with a lower molding concave portion 33 whose upper surface is shallowly recessed and a holding concave portion 34 that opens to the bottom surface of the lower molding concave portion 33. The upper mold 32 is formed with an upper molding recess 35 whose bottom surface is shallowly recessed and a pressing portion 36 which bulges downward from the lower surface of the upper molding recess 35 into a block shape. As shown in FIG. 2, the planar view shape of the pressing portion 36 is a square. The pressing portion 36 is disposed so as to correspond to the holding recess 34 in the front-rear direction and the left-right direction, that is, to face the holding recess 34 from above.

  In the secondary molding step, the primary molded product 11 is set on the lower mold 31 in advance. At this time, the bulging portion 13 is fitted into the holding recess 34, whereby the primary molded product 11 is positioned in the vertical direction and the horizontal direction. The metal member 20 is accommodated in the positioning recess 16 of the primary molded product 11 set in the lower mold 31. When the lower mold 31 and the upper mold 32 are closed, the central portion in the left-right direction of the pressing portion 36 comes into contact with the upper surface of the metal member 20 so that the metal member 20 is brought into contact with the opening 17 side by the pressing portion 36. Pressed downward. Further, the left and right side edges of the pressing part 36 abut against the area along the left and right side edges of the positioning recess 16 in the upper surface of the primary molded article 11 in a surface contact state. Due to the abutting action of the pressing portion 36, the upward displacement of the primary molded product 11 and the metal member 20 is restricted.

  Moreover, the cavity 37 for shape | molding the secondary shaping | molding part 19 is comprised because the lower shaping | molding recessed part 33 and the upper shaping | molding recessed part 35 unite | combine. In the front end portion of the primary molded product 11, the cavity 37 is incompatible with the pressing portion 36 of the metal member 20 and the outer peripheral edge of the flat plate portion 12 of the primary molded product 11, the entire circumference of the outer peripheral surface of the pressing portion 36. The area is facing. After the mold is closed, molten resin (not shown) is injected into the cavity 37 from the gate 38 provided at a position behind the positioning recess 16 in the upper mold 32, and the secondary molding part 19 is molded. The molded secondary molded part 19 is integrated in close contact with the region of the primary molded product 11 and the metal member 20 that faces the cavity 37. If the mold is opened after the molten resin is cured, the insert molded product 10 in which the secondary molded part 19, the primary molded product 11, and the metal member 20 are integrated is molded.

  Now, in the above-described forming step, the metal member 20 is accommodated in the positioning recess 16 of the primary molded product 11, so that the width dimension (dimension in the left-right direction) of the metal member 20 is taken into account in consideration of dimensional tolerances. The width is set smaller than the width dimension of the positioning recess 16 (the distance between the left and right inner side surfaces 16S). As a result, a side gap 40S (exaggerated in FIGS. 2 to 6) is formed between the outer side surface 20S of the metal member 20 and the inner side surface 16S of the positioning recess 16. A front gap 40F (exaggerated in FIGS. 2 to 6) is also formed between the front wall surface 16F of the positioning recess 16 and the front end surface 20F of the metal member 20 in consideration of dimensional tolerances. The left and right side surface gaps 40 </ b> S and the front surface gap 40 </ b> F constitute a circumferential surface gap 40 between the inner circumferential surface of the positioning recess 16 and the outer circumferential surface of the metal member 20.

  The left and right gaps between the left and right side gaps 40 </ b> S and the left and right ends of the opening 17 are narrower than the front and rear gaps between the front gap 40 </ b> F and the front end of the opening 17. Therefore, when a gap communicating from the side gap 40S to the opening 17 is formed between the lower surface of the left and right side edges of the metal member 20 and the bottom of the positioning recess 16, the molten resin that has flowed into the side gap 40S (Not shown) may enter the space 14 from the opening 17 through the gap on the bottom surface. When the molten resin that has entered the space 14 adheres to the compression coil spring 15, the smooth elastic deformation operation of the compression coil spring 15 is hindered.

  As a countermeasure, in this embodiment, two pairs of protrusions 18F and 18R that form a pair on the left and right are formed on the left and right inner side surfaces 16S of the positioning recess 16 with a space in the front and rear direction. The height of the protrusions 18F and 18R is the same as the depth of the positioning recess 16. The lower ends of the protrusions 18F and 18R are continuous with the bottom surface of the positioning recess 16, and the upper surfaces of the protrusions 18F and 18R are continuous with the upper surface of the primary molded article 11.

  The plan view shapes of the protrusions 18F and 18R are semicircular as shown in FIG. The left and right protrusions 18F and 18R that form a pair have a bilaterally symmetric form, and are disposed so as to face each other with the opening 17 of the space 14 in between. Further, the pair of front projections 18F are disposed at substantially the same position as the front end of the opening 17 in the front-rear direction, and the pair of rear projections 18R are disposed at substantially the same position as the rear end of the opening 17 in the front-rear direction. Is arranged. That is, the two pairs of protrusions 18F and 18R are positioned in the pair of left and right side gaps 40S in a state where the metal member 20 is fitted in the positioning recess 16. The formation positions of the two pairs of protrusions 18F and 18R in the front-rear direction and the left-right direction are within a range corresponding to the pressing portion 36 (a range covered by the pressing portion 36) in plan view.

  In the state in which the metal member 20 is accommodated with the positioning recess 16 aligned with the center in the width direction, the maximum width dimension W (see FIG. 2) within the dimensional tolerance of one side gap 40S is assumed. The protrusion dimension P (see FIG. 1) of the protrusions 18F and 18R from the inner side surface 16S of the positioning recess 16 is set to be larger than the maximum width dimension W of the side surface gap 40S. Due to this dimensional difference, when the metal member 20 is accommodated in the positioning recess 16, the protruding end portions of the two pairs of protrusions 18 </ b> F and 18 </ b> R come into contact with the left and right outer surfaces 20 </ b> S of the metal member 20 and are crushed. Plastically deformed.

  In a state in which the projecting ends of the projections 18F and 18R are crushed, there is no gap between the projections 18F and 18R and the left and right outer surfaces 20S of the metal member 20 so that the molten resin can pass through. Further, since the protrusions 18F and 18R are positioned so as to correspond to the entire region of the side gap 40S in the vertical direction, the molten resin is also interposed between the upper surfaces of the protrusions 18F and 18R and the lower surface of the pressing part 36. There is no gap that can pass through. Therefore, even if the molten resin injected from the gate 38 flows into the rear end portion of the side gap 40S from the rear of the pressing portion 36 in the secondary molding step, the flow of the molten resin is caused by the two pairs of protrusions on the rear side. Stop when it hits part 18R. Similarly, even if it goes around the front of the pressing portion 36 and flows into the front end portion of the side gap 40S, the flow of the molten resin stops when it hits the two pairs of projections 18F on the front side.

  The sealing region 41 constituted by the two pairs of front and rear projections 18F and 18R and the pressing portion 36 in the side clearance 40S is a peripheral clearance 40 between the inner peripheral surface of the positioning recess 16 and the outer peripheral surface of the metal member 20. Of these, it is located in the region closest to the opening 17. However, since there is no possibility that the molten resin flows into the sealing area 41, the molten resin is prevented from flowing into the space 14 from the opening 17 via the sealing area 41. In addition, since the space | interval of the front-back direction between the front clearance 40F and the opening part 17 is wider than the space | interval between the sealing area | region 41 (side surface clearance 40S) and the opening part 17, the molten resin which flowed into the front clearance 40F However, there is no risk of entering the space 14 through the gap between the lower surface of the metal member 20 and the bottom surface of the positioning recess 16.

  As described above, the insert molded product 10 according to the present embodiment is formed by injecting molten resin into the secondary molding die 30 in which the primary molded product 11 and the metal member 20 are set, so that the secondary molded part 19 and the primary molded product 10 are primary. The molded product 11 and the metal member 20 are integrally formed. The primary molded product 11 is formed with a space 14 that opens on the surface of the primary molded product 11 and a positioning recess 16 that is formed by denting a region of the surface of the primary molded product 11 that includes the opening 17 of the space 14. ing. In the secondary molding step, the metal member 20 that is accommodated in the positioning recess 16 and closes the opening 17 is pressed toward the opening 17 by the pressing portion 36 of the secondary molding die 30, and the outer periphery of the metal member 20. The circumferential surface gap 40 (side surface gap 40S) between the surface (outer side surface 20S) and the inner circumferential surface (inner side surface 16S) of the positioning recess 16 is covered with the pressing portion 36.

  Two pairs of protrusions 18F and 18R that contact the outer peripheral surface of the metal member 20 are formed on the inner peripheral surface of the positioning recess 16, and the protrusions 18F and 18R are in contact with the protrusions 18F and 18R. , 18R is plastically deformed so that the protruding end portion (that is, the positioning recess 16 side) is crushed by contact with the outer peripheral surface of the metal member 20. The plastic deformation of the protrusions 18F and 18R restricts the molten resin from entering the side surface gap 40S covered by the pressing part 36 in the peripheral surface gap 40. According to this configuration, even if there is a variation in the facing distance between the inner peripheral surface of the positioning recess 16 and the outer peripheral surface of the metal member 20 (that is, the width dimension of the side surface gap 40S), the variation is the protrusion 18F, Since the protruding end portion of 18R is absorbed by plastic deformation, it is possible to reliably prevent the molten resin from entering the side surface gap 40S of the peripheral surface gap 40.

  The protrusions 18F and 18R are formed on the inner peripheral surface of the positioning recess 16. This means that the protrusions 18F and 18R are made of synthetic resin, have lower rigidity than the metal member 20, and are easily plastically deformed. Therefore, the resistance when the metal member 20 is accommodated in the positioning recess 16 can be small. Further, the circumferential surface gap 40 is configured to include a pair of side surface gaps 40S positioned so as to sandwich the opening 17, and the pair of side surface gaps 40S includes two pairs of front and rear projections 18F and 18R. Has been placed. According to this configuration, the penetration of the molten resin into the peripheral surface gap 40 can be more reliably regulated as compared with the case where the protruding portions 18F and 18R are arranged only in one of the side surface gaps 40S. .

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) In the above embodiment, the protrusion is formed on the inner peripheral surface of the positioning recess and the outer peripheral surface of the metal member is planar. However, the inner peripheral surface of the positioning recess is flat and the outer peripheral surface of the metal member is A protrusion may be formed.
(2) In the above embodiment, the protrusion is formed only on the inner peripheral surface of the positioning recess. However, the protrusion may be formed only on the outer peripheral surface of the metal member. You may form in both outer peripheral surfaces. In the latter case, the protrusions may be brought into contact with the other flat peripheral surface, or the protrusions may be brought into contact with each other.
( 3 ) In the above embodiment, the shape of the projection in plan view is a semicircular shape, but the shape of the projection in plan view may be a shape other than a semicircle, such as a triangle or a trapezoid.

DESCRIPTION OF SYMBOLS 10 ... Insert molded product 11 ... Primary molded product 14 ... Space 16 ... Positioning recessed part 16F ... Front wall surface (inner peripheral surface of positioning recessed part)
16S ... inner surface (inner peripheral surface of positioning recess)
DESCRIPTION OF SYMBOLS 17 ... Opening part 18F ... Protrusion part 18R ... Protrusion part 19 ... Secondary molding part 20 ... Metal member 30 ... Mold for secondary molding 36 ... Press part 20F ... Front end surface (outer peripheral surface of metal member)
20S ... Outer surface (outer peripheral surface of metal member)
40 ... Surface clearance 40S ... Side clearance

Claims (2)

By injecting a molten resin into a secondary molding die in which a primary molded product and a metal member are set, a secondary molded portion, the primary molded product, and the metal member are integrated and molded,
In the primary molded product, a space opened on the surface of the primary molded product, and a positioning recess in a form in which a region including the opening of the space in the surface of the primary molded product is recessed, are formed.
In the secondary molding step, the metal member that is accommodated in the positioning recess and closes the opening is pressed toward the opening by the pressing portion of the secondary molding die, and the outer peripheral surface of the metal member In an insert molded product in which a peripheral surface gap between the inner peripheral surface of the positioning recess and the positioning recess is covered with the pressing portion,
Within the range covered by the pressing portion of the peripheral surface gap, there is a protrusion that contacts the other peripheral surface on at least one peripheral surface of the inner peripheral surface of the positioning recess and the outer peripheral surface of the metal member. Formed,
The peripheral gap is configured to include a pair of side gaps positioned so as to sandwich the opening, and the protrusions are arranged in pairs in the pair of side gaps,
When the positioning recess side is plastically deformed at the abutting portion of the protrusion, the molten resin is located downstream of the protrusion in the flow direction of the molten resin in the region covered with the pressing portion of the circumferential clearance. An insert molded product characterized in that the ingress of resin is restricted.   The insert-molded product according to claim 1, wherein the protrusion is formed on an inner peripheral surface of the positioning recess.

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