JP2010005933A - Method of manufacturing synthetic resin with metal part, and mold - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mold which can prevent a separation of a synthetic resin body from a metal part and at the same time, insert-mold a molded article by a die of a simple structure in the molded article of the synthetic resin with the metal part, and to provide a method of manufacturing the synthetic resin with the metal part. <P>SOLUTION: The mold 1 is for manufacturing a synthetic resin with a metal part 4 by molding integrally a plate nut 3 and a synthetic resin body 2. A screw hole 3h is formed on the plate nut 3 along a direction perpendicular to a takeoff direction E. The screw hole 3h is exposed on the synthetic resin with the metal part 4. The mold 1 has a support part 14 supporting the plate nut 3 so as to cover the screw hole 3h. A cavity of the mold 1 has a shape in which the synthetic resin is supplied so as to cover both ends of a part directed in a direction opposed to the takeoff direction E in the plate nut 3. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for producing a synthetic resin with a metal part, including a metal part in which an undercut is formed, and a molding die.

  Patent Document 1 discloses an example of a conventional synthetic resin with metal parts. In the technique of Patent Document 1, a waterproof pan, which is a synthetic resin molded body, and a nut are integrated by insert molding.

Japanese Patent No. 3661319

  In the technique of Patent Document 1, since the direction of taking out the synthetic resin body from the mold coincides with the direction in which the screw hole of the nut is formed, insert molding is possible with a mold having a simple structure.

  On the other hand, in a molded product of a synthetic resin with a metal part, an undercut (such as a screw hole) may be formed in the metal part along a direction inclined with respect to the direction of taking out the synthetic resin body. In such a case, when a molded product is manufactured by insert molding, a movable mold that moves in a direction different from the take-out direction is separately required to prevent the resin from entering the undercut portion. As a result, the structure of the mold becomes complicated.

  Therefore, conventionally, when manufacturing such a molded product, usually, only the synthetic resin body is formed first without performing the insert molding, and the metal part is attached to the molded synthetic resin body. ing. In this case, after attaching the metal part to the synthetic resin body, in order to prevent the metal part from falling out of the synthetic resin body, the synthetic resin body around the metal part is removed using a soldering iron or the like. The metal parts are fixed by melting and deforming. However, in such a method, the metal part may be detached from the synthetic resin body without being securely fixed.

  Therefore, the object of the present invention is to prevent the separation of the synthetic resin body and the metal part in the synthetic resin molded product with the metal part, and the molded product can be insert-molded with a simple structure mold. It is providing the manufacturing method of a metal mold | die and a synthetic resin with a metal component.

  In order to solve the above-described problems, a molding die according to the present invention is an integrated body of a metal part having an undercut formed along a direction inclined with respect to a direction of taking out a synthetic resin body and the synthetic resin body. A molding die for producing a synthetic resin with a metal part in which the undercut is molded and having a support part that supports the metal part so as to cover the undercut, and is a liquid synthetic A cavity to which resin is supplied is formed, and the synthetic resin is supplied to the cavity so as to cover at least a part of the metal component facing in the opposite direction to the take-out direction. It has a shape.

  According to this configuration, when the synthetic resin with a metal part with the undercut exposed is manufactured by insert molding, the undercut is covered by the support part in a state where the metal part is installed on the support part of the molding die. Therefore, even if the undercut of the metal part is formed along a direction inclined with respect to the take-out direction, the synthetic resin does not enter the undercut. As a result, a movable mold for the undercut portion is not required, and the mold structure can be simplified.

  Moreover, according to this structure, synthetic resin is supplied in a cavity so that at least one part may be covered among the parts which faced the opposite direction with respect to the taking-out direction in metal parts. Therefore, separation of the synthetic resin body and the metal part is prevented in the molded product.

  As described above, according to this configuration, in a synthetic resin molded product with a metal part, separation of the synthetic resin body and the metal part can be prevented, and the molded product can be insert-molded with a simple structure mold. .

  The “removal direction” refers to the direction (mold release direction) in which the synthetic resin body is removed from the molding die. In the present invention, the “undercut” is a through hole or a recess formed in a metal part. Further, in the metal part, the undercut formation direction (direction inclined with respect to the take-out direction) is the through direction of the through hole or the recessed direction of the recess.

  The “portion facing in the opposite direction with respect to the take-out direction” is a portion whose normal direction is directed in the opposite direction with respect to the take-out direction and other than the undercut.

  Further, the “metal part with an undercut” is, for example, a plate nut. Further, the metal member may be a plate member having a through hole without a screw groove in addition to a plate member having a screw groove formed on the inner surface of an undercut (through hole), such as a plate nut. Further, the undercut of the metal member may be a screw hole (concave portion) that does not penetrate, or a concave portion without a thread groove.

  The molding die according to the present invention may further include an extrusion pin for extruding and removing the synthetic resin with a metal part, and the support portion may be formed at a tip of the extrusion pin.

  According to this configuration, even when the metal part is installed at a deep position in the molding die, the entire synthetic resin with the metal part including the metal part is extruded by the extrusion pin. Therefore, the removal operation of the synthetic resin with metal parts can be reliably performed without cutting the synthetic resin with metal parts in the middle.

  In the molding die according to the present invention, a groove portion is formed in the support portion along the take-out direction, the support portion has a positioning portion, and the metal component is supported by the support portion. In the state, the metal part may enter the groove, the tip of the positioning part may protrude into the undercut, and the protrusion height of the tip may change elastically.

  According to this configuration, (i) since the metal part enters the groove formed in the support part, the metal part is reliably supported by the support part. Further, (ii) in a state where the metal part is supported by the support part, the tip part of the positioning part protrudes into the undercut, so that the position of the metal part with respect to the support part is reliably determined. This also suppresses the change of the position of the metal part in the support part after the metal part is installed on the support part, and further prevents the metal part from coming out of the support part. In addition, (iii) since the protruding height of the tip portion changes elastically, the installation work of the metal part with respect to the support part and the removal work of the metal part from the support part can be performed smoothly.

  Note that only one positioning portion may be provided, or a plurality of positioning portions may be provided. Moreover, the some positioning part may be provided in the both sides on both sides of the groove part.

  In the molding die according to the present invention, the positioning portion may be composed of an elastic body and a sphere attached to the tip of the elastic body.

  According to this configuration, by using the elastic body, the protruding height of the distal end portion of the positioning portion can be reliably adjusted with a simple configuration. Moreover, since the spherical body is attached to the tip of the elastic body, the metal part can be attached to and detached from the support part more smoothly.

  The elastic body only needs to elastically change the position of the sphere. For example, a coil spring, a leaf spring, rubber, or a synthetic resin member can be used as the elastic body. Moreover, as a sphere, a synthetic resin member and a metal material can be utilized, for example.

  In the molding die according to the present invention, the positioning portion may be a synthetic resin member having a rounded tip portion.

  According to this configuration, by using the synthetic resin member, the protruding height of the distal end portion of the positioning portion can be reliably adjusted with a simple configuration. Moreover, since the front end of the synthetic resin member is rounded, the metal part can be attached to and detached from the support part more smoothly.

  Moreover, in order to solve said subject, the manufacturing method of the synthetic resin with a metal component which concerns on this invention uses an undermold along the direction inclined with respect to the taking-out direction of a synthetic resin body using a shaping die. A method of manufacturing a synthetic resin with a metal part in which the formed metal part and the synthetic resin body are integrally molded to expose the undercut, wherein the metal is attached to a support portion formed in the molding die. Installing metal parts, installing metal parts, supplying synthetic resin in liquid form into the cavity formed in the mold, and curing the synthetic resin supplied in the cavity A curing step, a mold dividing step for dividing the molding die, and a removal step of removing the synthetic resin with metal parts from the molding die, and in the metal component installation step, The metal part is installed such that the undercut is covered by the support part, and in the synthetic resin supply step, at least a part of the metal part facing in the opposite direction to the take-out direction The synthetic resin is supplied so as to cover the surface.

  According to this method, it is possible to prevent the synthetic resin body and the metal component from being separated from each other in the molded product of the synthetic resin with the metal component, and it is possible to insert-mold the molded product with a mold having a simple structure.

  Synthetic resins include thermosetting resins (resins that are cured and cannot be restored by heating; phenol resins, epoxy resins, melamine resins, urea resins (urea resins), unsaturated polyester resins, alkyd resins, polyurethanes, polyimides. Etc.) and thermoplastic resins (polyethylene, polypropylene, polyvinyl chloride, polyvinylidene chloride, polystyrene, polyvinyl acetate, etc.) may be used. When the synthetic resin is a thermosetting resin, the curing process is a heating process. Moreover, when the synthetic resin is a thermoplastic resin, the curing step is a cooling step.

  In addition, the metal part installation process, the synthetic resin supply process, the curing process, the mold dividing process, and the removing process may be performed in this order, and different before and after these processes and between each process. A process may be provided.

  Further, in this method, the meanings of “extraction direction”, “part facing the opposite direction to the extraction direction”, “undercut”, and “metal part with undercut” are the same as described above. is there.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing the overall configuration of a molding die according to an embodiment of the present invention. FIG. 2 is a cross-sectional view showing the molding die after the metal part installation step. FIG. 3 is a cross-sectional view showing the molding die after the synthetic resin supply step. FIG. 4 is a cross-sectional view showing the molding die after the curing step and the die dividing step. FIG. 5 is a cross-sectional view showing the molding die after the extrusion process. FIG. 6 is a cross-sectional view showing the removal process. FIG. 7 is a perspective view showing the support part and the metal part before the metal part installation step. FIG. 8 is a perspective view showing the support part and the metal part after the metal part installation step. FIG. 9 is a cross-sectional view taken along arrow B-B ′ showing the support part and the metal part before the metal part installation step. FIG. 10 is a cross-sectional view taken along arrow D-D ′ showing the support part and the metal part after the metal part installation step. FIG. 11 is a plan view (C arrow view) showing the support part and the metal part after the metal part is installed. FIG. 12 is a plan view showing the vicinity of the support portion after the synthetic resin supply step. FIG. 13 is a plan view showing the vicinity of the support portion in the removal step.

(overall structure)
First, the overall configuration of the molding die 1 according to the present embodiment will be described. The molding die 1 is a metal part by insert molding (a molding method in which a metal part to be embedded in a plastic molded body is previously placed in a mold and filled with synthetic resin by injection molding or the like; integral molding). As shown in FIG. 1, a first mold 11, a second mold 12, a first push pin 13a, and two second push pins 13b are formed. Have A support portion 14 is formed on the first push pin 13a.

(About molded products)
The molded product of the synthetic resin 4 with metal parts manufactured by the molding die 1 will be described. The synthetic resin 4 with metal parts includes a plate nut (metal part) 3 and a synthetic resin body 2. Moreover, the synthetic resin 4 with a metal part is manufactured by integral molding (insert molding) of the plate nut 3 which is a metal part and the synthetic resin body 2 (see FIG. 6). In the present embodiment, the synthetic resin body 2 is a thermoplastic resin.

  In the molding die 1, the direction in which the synthetic resin body 2 is taken out (release direction) is represented by an arrow direction E in the figure. That is, the synthetic resin 4 with metal parts is taken out from the molding die 1 along the take-out direction E (see FIGS. 5 and 6).

  The plate nut 3 is formed with a screw hole (undercut) 3h (see FIGS. 6, 7, and 9 to 13). The screw hole 3h is formed along a direction inclined with respect to the take-out direction E. Specifically, when the direction in which the screw hole 3h is formed (penetration direction) is “formation direction”, the formation direction is a direction perpendicular to the take-out direction E (the direction of arrow G in FIG. 9). Yes. In addition, the undercut should just be formed along the direction inclined with respect to the taking-out direction E, and the formation direction of the undercut may not be perpendicular to the taking-out direction E. For example, the undercut formation direction may be the direction of arrow H in FIG.

  The plate nut 3 is a rectangular plate member in plan view, and the plate nut 3 is formed with a first side surface 3s, a second side surface 3t, a third side surface 3u, and a fourth side surface 3v ( (See FIGS. 7, 8, 11, and 13). In the molded product of the synthetic resin 4 with metal parts, the portion of the plate nut 3 facing in the direction opposite to the take-out direction E is the first side surface 3s (see FIGS. 7 to 10 and FIG. 13). That is, in the synthetic resin 4 with metal parts, the normal direction of the first side surface 3 s is opposite to the take-out direction E. The fourth side surface 3v is a portion of the side surface of the plate nut 3 that faces the take-out direction E.

  In the molded product of the synthetic resin 4 with metal parts, a part of the first side surface 3s is covered with the synthetic resin body 2 (see FIG. 13). In FIG. 13, the portion indicated by F of the synthetic resin body 2 covers a part (both ends) of the first side surface 3s. The portion indicated by F functions as a retaining for the plate nut 3, and as a result, the plate nut 3 is difficult to come off from the synthetic resin body 2.

  Further, in the molded product of the synthetic resin 4 with metal parts, the second side surface 3t, the third side surface 3u, the fourth side surface 3v and the periphery of the plate nut 3 are covered with the synthetic resin body 2. Further, the screw hole 3h of the plate nut 3 and its peripheral region are exposed without being covered with the synthetic resin body 2 (see FIGS. 6 and 13).

(First and second mold)
As described above, the mold 1 includes the first mold 11 and the second mold 12. The first mold 11 is a cavity mold (concave mold), and the second mold 12 is a core mold (convex mold). A convex part 12t is formed on the second mold 12, and a concave part 11t is formed on the first mold 11 (see FIGS. 5 and 6). The first mold 11 is a movable mold, and the second mold 12 is a fixed mold.

  Further, in the state where the first mold 11 and the second mold 12 are closed, a cavity 1c is formed between the concave portion 11t of the first mold 11 and the convex portion 12t of the second mold 12. (See FIGS. 1 to 3). As will be described later, liquid synthetic resin 2p is supplied to the cavity 1c. The cavity 1c has a shape to which the synthetic resin 2p is supplied so as to cover a part of the first side surface 3s of the plate nut 3.

  Further, a synthetic resin passage 11b for supplying the synthetic resin 2p from the end of the first mold 11 to the cavity 1c is formed inside the first mold 11 (see FIG. 1).

(Extruded pin)
The molding die 1 has a first extrusion pin 13a and two second extrusion pins 13b. When the synthetic resin 4 with metal parts is removed from the molding die 1, the first extruding pin 13a and the two second extruding pins 13b are moved forward, so that the synthetic resin 4 with metal parts is extruded from the convex portion 12t. It is.

  The first extrusion pin 13 a and the two second extrusion pins 13 b are provided inside the second mold 12. In the state where these push-out pins are retracted most (the state shown in FIGS. 1 to 4), the tip of the first push-out pin 13a is located deep in the convex portion 12t of the second mold 12, and the two second The tip position of the two push pin 13b coincides with the surface position of the convex portion 12t. Further, in the state where these push pins advance (the state shown in FIGS. 5 and 6), the tip of the first push pin 13a reaches the surface position of the convex portion 12t, and the tips of the two second push pins 13b. Reaches a position protruding from the surface of the convex portion 12t. Further, the first push pin 13a includes a support portion 14 to be described later.

(Support part)
The support portion 14 is formed at the tip of the first push pin 13a (see A in FIG. 1 and FIGS. 11 to 13). The support portion 14 supports the plate nut 3 so as to cover the screw hole 3h (see FIGS. 2, 8, 10, 11, and 12).

  The support portion 14 is formed with a groove portion 14d. More specifically, the support portion 14 has two plate portions, a first plate portion 14b and a second plate portion 14c, and the groove portion 14d has the first plate portion 14b and the second plate portion. 14c (see FIG. 7). And the plate nut 3 is pinched | interposed between the 1st board part 14b and the 2nd board part 14c so that it may mention later. Further, since the groove portion 14 d is formed along the take-out direction E, the plate nut 3 can be detached from the support portion 14 along the take-out direction E.

  Moreover, the support part 14 has the positioning part 14p. The positioning portion 14p includes a coil spring (elastic body) 14s and a sphere 14t attached to the tip of the coil spring 14s (see FIGS. 9 and 10). The sphere 14t is a synthetic resin member. Moreover, the positioning part 14p is arrange | positioned inside the 1st board part 14b. Specifically, a through hole 14h is formed in the first plate portion 14b, and the positioning portion 14p is disposed inside the through hole 14h. The positioning portion 14p is attached to the support plate 14j, and the support plate 14j functions as a lid portion of the through hole 14h.

  In a state before the plate nut 3 is installed with respect to the support portion 14, the tip end portion of the positioning portion 14p protrudes into the groove portion 14d from the inner surface position of the first plate portion 14b (FIGS. 9 and 9). 10). Then, in a state where the plate nut 3 is supported by the support portion 14, the plate nut 3 enters the groove portion 14d, and the tip end portion of the positioning portion 14p protrudes into the screw hole 3h (see FIG. 10). ). Further, since the coil spring 14s can be expanded and contracted, the protruding height (see height J in FIG. 9 and height K in FIG. 10) of the positioning portion 14p changes elastically.

(Production method)
Next, the manufacturing method of FIGS. 1 to 4 will be described. In the initial state, nothing is attached to the molding die 1 (see FIGS. 1, 7 and 9).

  First, the plate nut 3 is installed with respect to the support part 14 formed in the molding die 1 (metal component installation step; see FIGS. 2, 8, 10, and 11). In this step, the plate nut 3 is installed so that the screw hole (undercut) 3h is covered by the support portion 14 (see FIGS. 7 to 11). In this step, since the plate nut 3 and the positioning portion 14p are in contact with each other when the plate nut 3 is installed, a light resistance force is generated by these frictions. After this step, the plate nut 3 is supported by the support portion 14. That is, the plate nut 3 enters the groove portion 14d, and the tip end portion of the positioning portion 14p protrudes into the screw hole 3h (see FIG. 10).

  Next, the liquid synthetic resin 2p is supplied into the cavity 1c formed in the molding die 1 (synthetic resin supply step; see FIGS. 3 and 12). In this step, the synthetic resin 2p heated and melted is supplied to the cavity 1c using an injection device (not shown). In this step, the synthetic resin 2p is sent to the cavity 1c through the synthetic resin passage 11b. At this time, since the screw hole 3h of the plate nut 3 is covered with the support portion 14, the synthetic resin 2p does not enter the screw hole 3h.

  Further, in the synthetic resin supply step, the synthetic resin 2p is supplied so as to cover a part of the first side surface 3s that is a portion facing the direction opposite to the take-out direction E in the plate nut 3 (FIG. 13 F portion).

  Next, the synthetic resin 2p supplied into the cavity 1c is cured (curing process). Specifically, since the synthetic resin 2p is a thermoplastic resin, the synthetic resin 2p in the cavity 1c is cooled and cured over time.

  When the synthetic resin 2p is sufficiently cured, the molding die 1 is divided (mold dividing step; see FIG. 4). Specifically, the movable first mold 11 is moved to expose the synthetic resin 4 with metal parts. In this state, the synthetic resin 4 with metal parts is attached to the second mold 12.

  Next, the synthetic resin 4 with metal parts is removed from the molding die 1 (removal step; see FIGS. 5 and 6). Specifically, the first extruding pin 13a and the two second extruding pins 13b are advanced, and the synthetic resin 4 with metal parts is pulled away from the second mold 12 (see FIG. 5). And the synthetic resin 4 with a metal component which is a molded product is removed from the front-end | tip (support part 14) of the 1st extrusion pin 13a, and the front-end | tip of the two 2nd extrusion pins 13b (refer FIG. 6, FIG. 13).

  Further, as described above, in the synthetic resin 4 with metal parts, a part of the first side surface 3 s is covered with the synthetic resin body 2. Therefore, in the removing step, the plate nut 3 is pulled by the synthetic resin body 2 and moves together with the synthetic resin body 2, so that the plate nut 3 can be reliably and easily separated from the support portion 14. Moreover, in this process, when the plate nut 3 is separated from the support portion 14, the plate nut 3 and the positioning portion 14p come into contact with each other, so that a light resistance force is generated by these frictions.

  As described above, the synthetic resin 4 with metal parts is manufactured. After this, the first extrusion pin 13a and the two second extrusion pins 13b are retracted and the first mold 11 is moved by moving the first mold 11 and the second mold for the next manufacturing preparation. 12 is closed (preparation step; see FIG. 1).

  In addition, you may install the plate nut 3 of the next molded product with respect to the support part 14 after a removal process and before a preparatory process.

(effect)
Next, the effect of the manufacturing method of the shaping die 1 concerning this embodiment and the synthetic resin with a metal component is demonstrated. The molding die 1 according to the present embodiment includes a plate nut (metal part) 3 in which a screw hole (undercut) 3h is formed along a direction perpendicular to the take-out direction E of the synthetic resin body 2, and a synthetic resin. The body 2 is integrally molded to manufacture the synthetic resin 4 with metal parts in which the screw holes 3h are exposed, and has a support portion 14 that supports the plate nut 3 so as to cover the screw holes 3h. A cavity 1c to which the liquid synthetic resin 2p is supplied is formed, and the cavity 1c is formed at both ends of the portion (first side surface 3s) of the plate nut 3 facing in the opposite direction to the take-out direction E. It has a shape to which the synthetic resin 2p is supplied so as to cover it.

  According to this configuration, when the synthetic resin 4 with a metal part, in which the screw hole 3h is exposed, is manufactured by insert molding, the screw hole 3h is formed in a state where the plate nut 3 is installed on the support portion 14 of the molding die 1. Covered by the support 14. Therefore, even if the screw hole 3h of the plate nut 3 is formed along the direction inclined with respect to the take-out direction E as in this embodiment, the synthetic resin 2p does not enter the screw hole 3h. . As a result, a movable mold for the undercut portion is not required, and the mold structure can be simplified.

  Further, according to this configuration, the synthetic resin 2p is supplied into the cavity 1c so as to cover a part of the portion of the plate nut 3 facing in the direction opposite to the take-out direction E. Therefore, separation of the synthetic resin body 2 and the plate nut 3 is prevented in the molded product.

  As described above, according to this configuration, in the molded product of the synthetic resin 4 with metal parts, the synthetic resin body 2 and the plate nut 3 can be prevented from being separated, and the molded product is insert-molded with a simple mold. be able to.

  The molding die 1 further includes a first extrusion pin 13a for extruding and removing the synthetic resin 4 with a metal part, and the support portion 14 is formed at the tip of the first extrusion pin 13a.

  According to this configuration, even when the plate nut 3 is installed at a deep position in the molding die 1 as in the present embodiment, the metal member including the plate nut 3 is attached by the first push pin 13a. The entire synthetic resin 4 is extruded. Therefore, the removal operation | work of the synthetic resin 4 with a metal component can be performed reliably, without cutting the synthetic resin 4 with a metal component in the middle.

  Further, in the molding die 1, a groove portion 14 d is formed in the support portion 14 along the take-out direction E. The support portion 14 has a positioning portion 14 p, and the plate nut 3 is supported by the support portion 14. In this state, the plate nut 3 enters the groove 14d, the tip of the positioning portion 14p protrudes into the screw hole 3h, and the protruding height of the tip of the positioning portion 14p changes elastically.

  According to this configuration, (i) since the plate nut 3 enters the groove portion 14d formed in the support portion 14, the plate nut 3 is reliably supported by the support portion 14. Further, (ii) in a state where the plate nut 3 is supported by the support portion 14, the tip portion of the positioning portion 14p protrudes into the screw hole 3h, so that the position of the plate nut 3 with respect to the support portion 14 is reliably determined. It is done. In addition, this prevents the position of the plate nut 3 from changing in the support portion 14 after the plate nut 3 is installed on the support portion 14 and further prevents the plate nut 3 from coming out of the support portion 14. . Also, (iii) the projecting height of the tip portion of the positioning portion 14p is elastically changed, so that the installation work of the plate nut 3 with respect to the support portion 14 and the removal operation of the plate nut 3 from the support portion 14 are performed. It can be done smoothly.

  Further, in the molding die 1, the positioning portion 14p includes a coil spring (elastic body) 14s and a sphere 14t attached to the tip of the coil spring 14s.

  According to this configuration, by using the coil spring 14s, which is an elastic body, the protruding height of the distal end portion of the positioning portion 14p can be reliably adjusted with a simple configuration. Moreover, since the spherical body 14t is attached to the tip of the coil spring 14s, the work of detaching the plate nut 3 from the support portion 14 can be performed more smoothly.

  Moreover, according to the molding die 1, a molded product (synthetic resin 4 with metal parts) can be insert-molded. Therefore, compared with the case where the metal part is attached to the molded synthetic resin body and then the metal part is fixed by melting the synthetic resin body using a soldering iron or the like, the plate nut (metal part) 3 and the synthetic resin are used. Separation from the body 2 is reliably prevented regardless of the skill of the operator. Therefore, it is possible to prevent occurrence of defective fixing of metal parts. Moreover, since the process of dissolving the synthetic resin body can be omitted, the number of manufacturing processes can be reduced.

  In the mold 1, the plate nut 3 is sandwiched between two plate portions (first plate portion 14 b and second plate portion 14 c). Therefore, the plate nut 3 is reliably supported by the support portion 14.

  Further, in the method for manufacturing the synthetic resin 4 with a metal part according to the present embodiment, the screw hole 3h is formed along the direction perpendicular to the take-out direction E of the synthetic resin body 2 using the molding die 1. The plate nut 3 and the synthetic resin body 2 are integrally molded to manufacture the synthetic resin 4 with metal parts in which the screw holes 3h are exposed. The plate nut is attached to the support portion 14 formed in the molding die 1. 3, a metal component installation step, a liquid synthetic resin 2 p is supplied into the cavity 1 c formed in the molding die 1, and a synthetic resin 2 p supplied into the cavity 1 c In the metal part installation process, there is a curing process for curing the mold, a mold dividing process for dividing the molding die 1, and a removal process for removing the synthetic resin 4 with metal parts from the molding die 1. The screw hole 3h is supported by the support portion In the synthetic resin supply step, the synthetic resin is so covered as to cover both end portions of the portion (first side surface 3s) facing the opposite direction to the take-out direction E in the synthetic nut supply step. 2p is supplied.

  According to this method, in the molded product of the synthetic resin 4 with metal parts, the synthetic resin body 2 and the plate nut 3 can be prevented from being separated, and the molded product can be insert-molded with a mold having a simple structure.

(Modification)
Next, a molding die according to a modified example of the above-described embodiment will be described with a focus on differences from the above-described embodiment. In addition, about the part same as said embodiment, the same code | symbol is attached | subjected to a figure, and the description is abbreviate | omitted. FIG. 14 is a cross-sectional view showing a support portion and metal parts according to a modification. In FIG. 14, portions denoted by reference numerals 114, 114b, and 114c correspond to portions denoted by reference numerals 14, 14b, and 14c, respectively, in the above-described embodiment.

  In the support part 114 according to this modification, the positioning part 114p is a synthetic resin member having a rounded tip. According to such a configuration, by using a synthetic resin member as the positioning portion 114p, the protruding height of the tip portion of the positioning portion 114p can be reliably adjusted with a simple configuration. Moreover, since the front end of the synthetic resin member is rounded, the work of detaching the plate nut 3 from the support portion 114 can be performed more smoothly.

  Moreover, in this modification, the extrusion pin is thinner than the above embodiment, and accordingly, the first plate portion 114b and the second plate portion 114c are the first plate portion 14b and the second plate portion. The plate thickness (vertical direction in FIG. 14) is thinner than 14c, and the width is also narrower. Thus, even if it is difficult to attach the positioning portion 14p as described above to the first plate portion 114b, a synthetic resin member such as the positioning portion 114p has a simple structure. Attachment to the 1st board part 114b is attained.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the present invention.

  For example, in the above-described embodiment, not only the screw hole (undercut) 3h but also the peripheral region of the screw hole 3h in the plate nut 3 is covered with the support portion 14 after the metal part installation step. And in the synthetic resin 4 with a metal component, the screw hole 3h and its peripheral region are exposed. However, only the undercut may be covered by the support portion after the metal part installation step. That is, in the molded product, only the undercut (the inner surface of the undercut) may be exposed, and the other part may be covered with the synthetic resin body.

  Moreover, in said embodiment, although the separation direction of the 1st metal mold | die 11 and the 2nd metal mold | die 12 and the taking-out direction E correspond, these do not need to correspond.

It is sectional drawing which shows the whole structure of the shaping die based on one Embodiment of this invention. It is sectional drawing which shows the shaping die after a metal component installation process. It is sectional drawing which shows the shaping die after a synthetic resin supply process. It is sectional drawing which shows the shaping | molding die after a hardening process and a metal mold | die division | segmentation process. It is sectional drawing which shows the shaping die after an extrusion process. It is sectional drawing which shows a removal process. It is a perspective view which shows the support part and metal component before a metal component installation process. It is a perspective view which shows the support part and metal component after a metal component installation process. It is B-B 'arrow sectional drawing which shows the support part and metal component before a metal component installation process. It is D-D 'arrow sectional drawing which shows the support part and metal component after a metal component installation process. It is a top view (C arrow view) which shows the support part and metal component after metal component installation. It is a top view which shows the support part vicinity after a synthetic resin supply process. It is a top view which shows the support part vicinity in a removal process. It is sectional drawing which shows the support part and metal component which concern on a modification.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mold 1c Cavity 11 1st metal mold | die 11b Synthetic resin channel | path 11t Concave part 12 2nd metal mold 12t Convex part 13a 1st extrusion pin (extrusion pin)
13b Second push pin 13c Base part 14 Support part 14b First plate part 14h Through hole 14j Support plate 14c Second plate part 14d Groove part 14p Positioning part 14s Coil spring (elastic body)
14t Sphere 114p Synthetic resin member 2 Synthetic resin body 2p Liquid synthetic resin 3 Plate nut (metal part)
3h Screw hole (undercut)
3s first side (portion facing away from the take-out direction)
3t 2nd side surface 3u 3rd side surface 3v 4th side surface (part facing the taking-out direction)
4 Synthetic resin with metal parts

Claims (6)

A metal part with an undercut formed along a direction inclined with respect to the direction of taking out the synthetic resin body and the synthetic resin body are integrally molded to produce a synthetic resin with a metal part with the undercut exposed. A mold for molding,
A support part for supporting the metal part so as to cover the undercut;
A cavity to which liquid synthetic resin is supplied is formed,
The cavity has a shape to which the synthetic resin is supplied so as to cover at least a part of a part of the metal part facing in a direction opposite to the take-out direction. Molding mold. Further having an extrusion pin for extruding and removing the synthetic resin with metal parts;
The molding die according to claim 1, wherein the support portion is formed at a tip of the extrusion pin. A groove portion is formed in the support portion along the extraction direction,
The support part has a positioning part,
In a state where the metal part is supported by the support part, the metal part enters the groove part, and a tip part of the positioning part protrudes into the undercut,
The molding die according to claim 1 or 2, wherein the protruding height of the tip portion changes elastically.   4. The molding die according to claim 3, wherein the positioning portion includes an elastic body and a sphere attached to the tip of the elastic body.   4. The molding die according to claim 3, wherein the positioning portion is a synthetic resin member having a rounded tip portion. Using a molding die, a metal part in which an undercut is formed along a direction inclined with respect to the direction of taking out the synthetic resin body and the synthetic resin body are integrally molded, and the metal in which the undercut is exposed A method for producing a synthetic resin with parts,
A metal part installation step of installing the metal part on a support portion formed on the molding die; and
A synthetic resin supply step of supplying a liquid synthetic resin into a cavity formed in the molding die;
A curing step of curing the synthetic resin supplied into the cavity;
A mold dividing step of dividing the molding mold;
Removing the synthetic resin with metal parts from the molding die, and
In the metal part installation step, the metal part is installed so that the undercut is covered by the support part,
In the synthetic resin supply step, the synthetic resin is supplied so as to cover at least a part of a portion of the metal component facing in the direction opposite to the take-out direction. A method for producing a synthetic resin.

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