JP2019051650A - Insert molding mold and resin molding product obtained by the same - Google Patents

Abstract

To provide an insert molding mold that can cope not only with the variation in dimensions of metal members disposed in a resin but also with the variation in shapes.SOLUTION: An insert molding mold for injection molding a resin molding product in which a cylindrical metal member 5 having a central through hole 4 is disposed on the inner circumferential surface of a bolt insertion hole by insert molding includes: a stationary mold 10; a movable mold 20; a pressing member 30 movable into/out of a cavity; and a stopper member 35 arranged orthogonally to the pressing member 30 such as to move forward/backward. The pressing member 30 is always energized toward the metal member 5 side by a spring 31, and, in the clamped state, has a contact surface 30a coming into contact with the outer circumferential edge 5b on the bolt receiving surface 5a side of the metal member 5 such as to cover the whole of it. The contact surface 30a is a tapered surface inclining from the outer circumferential edge 5b of the metal member 5.SELECTED DRAWING: Figure 4

Description

  The present invention provides an insert molding die for injection molding of a resin molded product in which a cylindrical metal member having a central through hole is disposed on the inner peripheral surface of a bolt insertion hole by insert molding. The present invention relates to a resin molded product.

  An example of such a resin molded product is a housing (case) of an electronic component for automobiles. As an insert molding die for molding the resin molded product, for example, there is Patent Document 1 below. Patent Document 1 discloses a mold that can absorb variations in height and manufacturing tolerances of a metal member (color) disposed in a resin molded product. Specifically, it comprises a pair of fixed mold (lower mold) and movable mold (upper mold), and a nest for inserting and placing a collar. The nest is allowed to enter and exit from the fixed mold into the cavity, and is always urged toward the opposed movable mold side. This nesting consists of a columnar upper part inserted through the central through-hole of the collar and a dish-shaped bottom part that serves as a mounting base for the collar. When the mold is clamped, the nesting is performed so that the upper surface of the collar abuts the movable mold. The height dimension is designed. In this manner, the nest for placing the collar is provided so as to be movable in and out of the cavity, and is always urged toward the opposed movable mold, thereby corresponding to variations in the height of the collar.

JP 2012-250419 A

  However, in Patent Document 1, the upper surface of the collar and the movable mold are in contact with each other when the mold is clamped. That is, the upper surface of the collar and the movable die are in surface contact with each other, and the contact area is large. At this time, prevention of inflow of the molten resin between the upper surface of the collar and the movable mold depends only on the spring biasing force of the nest. However, in injection molding, molten resin is injected into the cavity at a relatively high inflow pressure. Therefore, there is a limit to the pressing force when the upper surface of the collar is in surface contact with the movable mold, and the molten resin flows between the upper surface of the collar and the movable mold against the spring biasing force of the nesting. The upper surface may be covered with resin.

  Further, in Patent Document 1, it is possible to deal with variations in the height of the color, but it is impossible to deal with variations in shape. Specifically, the inflow of the molten resin can be prevented if the upper surface of the collar and the movable mold are completely flat and in close contact with each other, but manufacturing variations are unavoidable on the upper surface of the collar or the movable mold. In this case, if there is any gap between the upper surface of the collar and the movable mold due to the shape variation, the molten resin flows into the gap and the upper surface of the collar is covered with the resin. If the outer diameter of the collar is larger than the bottom of the insert, the molten resin flows into the portion protruding from the insert and is covered with the resin.

  If the upper surface of the collar is covered with the resin in this manner, the fastening force of the bolt inserted into the central through hole of the collar may be hindered by the resin and may be reduced, or the resin molded product may be damaged.

  Further, in Patent Document 1, in the obtained resin molded product, the color upper surface and the surface of the resin surrounding the color upper surface are at least flush with each other, and in some cases, the color upper surface is covered with resin, so that the resin surface is higher than the color upper surface. There is a possibility. As a result, the bolt fastening force cannot be effectively received by the collar.

  Therefore, the present invention solves the above-described problem, and is an insert molding die that can cope with not only dimensional variation but also shape variation of a metal member disposed in the resin, and resin molding obtained thereby. The purpose is to provide goods.

  As a means for that purpose, the present invention provides an insert molding die for injection molding of a resin molded product in which a cylindrical metal member having a central through hole is disposed on the inner peripheral surface of a bolt insertion hole by insert molding. A movable mold that can move forward and backward with respect to the fixed mold and forms a cavity together with the fixed mold in a clamped state; and at least one of the fixed mold and the movable mold to enter the cavity And a presser member that presses the metal member that is preset in the cavity. The pressing member is constantly urged in the direction in which the metal member is pressed, and has a contact surface that contacts the entire outer periphery of the metal member when the mold is clamped. In addition, the contact surface is a tapered surface inclined with respect to the outer peripheral edge of the metal member.

  According to this, since the presser member abuts so as to cover the entire outer peripheral edge of the metal member in a state where the mold is clamped, the molten resin to the axial end surface side of the metal member set in advance in the cavity The inflow is blocked by the pressing member. At this time, the presser member is always urged in the direction in which the metal member is pressed and can be moved into and out of the cavity. Therefore, even if there is a variation in the height of the metal member, the cavity of the presser member follows this. The amount of protrusion to the inside varies freely, and the presser member comes into contact with the metal member while maintaining a constant pressing force at all times. Thus, even if the metal member has a variation in height, it can be absorbed effectively.

  In addition, in the present invention, the presser member is in contact with the outer peripheral edge of the metal member, and the contact surface of the presser member with the metal member is an inclined tapered surface. That is, the pressing member abuts against the corner of the metal member obliquely. Therefore, the pressing member and the metal member are in line contact. Even if the outer peripheral edge of the metal member is chamfered (C surface), the contact area is sufficiently small as compared with the case where the metal member comes into contact with the end surface in the axial direction. Therefore, even with the same urging force, in the present invention, the pressing force concentrates more than in the case of surface contact as in Patent Document 1, so that the action of blocking the molten resin by the pressing member is great. Thereby, it can prevent more effectively that the axial direction end surface of a metal member is covered with resin.

  In addition, since the contact surface of the pressing member with the metal member is a tapered surface, even if the metal member has a variation in shape due to manufacturing variation or a variation in radial dimension, this can be absorbed.

  The insert molding die according to the present invention is arranged so as to be able to advance and retreat with respect to the presser member perpendicular to the presser member, and keeps the state of the presser member pressing the metal member in a clamped state. A stopper member is also preferably provided. According to this, it can prevent more effectively that molten resin flows into the axial direction end surface side of a metal member against the urging | biasing force of a pressing member. That is, it is possible to more effectively prevent the axial end surface of the metal member from being covered with the resin.

  It is preferable to form a positioning recess for setting the metal member in the mold facing the presser member. According to this, in addition to facilitating positioning of the metal member set in advance in the cavity, it is possible to prevent displacement of the metal member during injection molding.

  The mold provided with the presser member may be formed with a protruding portion that comes into contact with one axial surface of the metal member or is inserted into the central through hole of the metal member in a clamped state. preferable. According to this, a metal member can be stabilized more at the time of injection molding.

  Moreover, according to this invention, the resin molded product by which the cylindrical metal member which has a center through-hole by the inner peripheral surface of the bolt insertion hole was arrange | positioned by insert molding can also be provided. In this resin molded product, the entire peripheral surface of the metal member is covered with resin, but at least one surface in the axial direction of the metal member does not have resin and is not covered with resin. In addition, the surface of the resin covering the peripheral surface is inclined toward the other surface side in the axial direction of the metal member and is at a position lower than the one surface of the metal member.

  According to this, since at least one surface in the axial direction of the metal member is not covered with the resin and the surface of the resin is at a position lower than the axial end surface of the metal member, the axial end surface is exposed. doing. Therefore, when the bolt is inserted into the bolt insertion hole and fastened, the bolt comes into contact with the metal member, and the fastening force can be accurately received by the metal member. Thereby, the fall of fastening force and the failure | damage of a resin molded product can be prevented.

  On the other hand, the outer peripheral edge of the metal member may be entirely or partially covered with resin in the axial direction. Thereby, the corner | angular part of a metal member becomes difficult to be damaged.

  According to the mold for insert molding of the present invention, the metal member disposed in the resin by insert molding absorbs not only the variation in height due to the manufacturing variation but also the variation in shape and radial dimension. However, the axial end surface of the metal member can be prevented from being covered with the resin.

  Further, the resin molded product obtained in this way is exposed at least one surface in the axial direction of the metal member is not covered with the resin, and the surface of the resin is lower than the axial end surface of the metal member. Therefore, when the bolt is inserted into the bolt insertion hole and fastened, the bolt comes into contact with the metal member without being obstructed by the resin. Thereby, the fastening force of a volt | bolt can be received with a metal member, and the fall of fastening force and the failure | damage of a resin molded product can be prevented. Moreover, since the outer peripheral edge of the metal member, that is, the corner portion is protected by the resin, the corner portion is hardly damaged.

It is a perspective view of a resin molded product. It is the sectional view on the AA line of FIG. FIG. 2 is a cross-sectional view corresponding to the line AA in FIG. 1 in a mold in an open state. It is sectional drawing of the metal mold | die of the state clamped from the state of FIG. It is a principal part expanded sectional view of the metal mold | die which shows the contact state of the metal member with a shape variation, and a pressing member. It is a principal part expanded sectional view of the resin molded product manufactured in the state of FIG. It is a principal part expanded sectional view of the metal mold | die which shows the contact state of the metal member with another shape variation, and a pressing member. It is a principal part expanded sectional view of the resin molded product manufactured in the state of FIG. It is a principal part expanded sectional view of the metal mold | die which shows the contact state of the outer peripheral edge of the R-shaped metal member and the pressing member. It is a principal part expanded sectional view of the resin molded product manufactured in the state of FIG. It is AA equivalent sectional drawing of FIG. 1 which shows the modification of a metal mold | die.

  Hereinafter, representative embodiments of the present invention will be described. The resin molded product to be manufactured according to the present invention includes, for example, a case (case) for arranging various parts and articles such as electronic parts, sensor parts, small devices, and small mechanisms by bolt fixing at predetermined positions. Terminal block. The object to be fixed is not particularly limited and can be disposed in various machines, devices, structures, and the like. Examples thereof include an electric steering such as an automobile and a power control unit.

  As shown in FIG. 1, such a resin molded product 1 integrally includes a housing body 2 and a plurality of bolt fixing portions 3 provided on the outer surface of the housing body 2. In addition, the shape of the resin molded product 1 shown in FIG. 1 is only an example, and the simplest shape is illustrated. Actually, the resin molded product 1 is manufactured in various shapes according to various parts to be accommodated, installation locations, and the like.

  The housing body 2 has a box shape whose upper surface (reference to the drawing) is open, and various components and the like are accommodated therein. If necessary, the upper surface opening is closed by a lid (not shown). The bolt fixing portion 3 has a bolt insertion hole penetrating in the thickness direction, and a cylindrical metal member 5 having a central through hole 4 is disposed on the inner peripheral surface thereof by insert molding. The axial direction of the metal member 5 (the opening direction of the central through hole 4) coincides with the thickness direction of the bolt fixing portion 3. Further, the axial dimension of the metal member 5 is slightly larger than the thickness dimension of the bolt fixing portion 3.

  And as shown with the imaginary line of FIG. 2, the resin molded product 1 can be fixed to a predetermined location by fastening the volt | bolt B in the state which inserted the volt | bolt B in the center through-hole 4 of the metal member 5. FIG. At this time, the head Bh of the bolt B comes into contact with the upper surface of the metal member 5 (hereinafter referred to as a bolt receiving surface 5a), so that the bolt receiving surface 5a receives the fastening force of the bolt. Thereby, damage to the bolt fixing part 3 and the resin molded product 1 is prevented.

  The metal member 5 typically includes a collar, but may be a female screw (nut). The outer shape of the metal member 5 may be a circle or a polygon such as a triangle or a quadrangle, and is not particularly limited. On the other hand, the inner shape of the metal member 5 (the radial cross-sectional shape of the central through hole 4) is circular. This is because it is a hole for inserting the bolt B. The inner diameter of the metal member 5 (the diameter of the central through-hole 4) is larger than the outer diameter of the screw shaft Bs of the bolt B and smaller than the outer diameter of the head Bh of the bolt B. The axial dimension of the metal member 5 is smaller than the length dimension of the screw shaft Bs of the bolt B.

  Next, an insert molding die (hereinafter simply referred to as a mold) for manufacturing the resin molded product 1 will be described. As shown in FIGS. 3 and 4, the mold includes a fixed mold 10 and a movable mold 20 that can move forward and backward relative to the fixed mold 10. 3 shows the mold open state, and FIG. 4 shows the mold clamped state. In the clamped state in which the movable mold 20 is abutted against the fixed mold 10, a cavity corresponding to the desired shape of the resin molded product 1 is formed. Although only the cavity corresponding to the bolt fixing portion 3 is shown in each drawing, the cavity for the housing body 2 is also formed continuously with the cavity for the bolt fixing portion 3 shown in the figure. . In these cavities, molten resin injected through a nozzle (not shown) is supplied through a runner.

  The movable mold 20 is provided with a metal pressing member 30. When the mold is clamped, the pressing member 30 comes into contact with the metal member 5 set in advance in the cavity. Specifically, the metal member 5 is set in advance in the cavity so that the bolt receiving surface 5a is on the movable mold 20 side, and when the mold is clamped, the holding member 30 is located on the bolt receiving surface 5a side of the metal member 5. Abuts the outer periphery. At this time, a pressing recess 32 is formed in the center portion in the radial direction on the surface of the pressing member 30 facing the metal member 5, and the peripheral wall of the pressing recess 32 is in contact with the outer peripheral edge 5 b of the metal member 5. It becomes the surface 30a. The presser recessed portion 32 has a divergent shape, and the contact surface 30a is a tapered surface that is inclined outwardly.

  The outer diameter of the pressing member 30 is larger than the outer diameter of the metal member 5. The minimum diameter of the pressing recess 32 (the diameter on the bottom side of the pressing recess 32) is smaller than the outer diameter of the metal member 5, and the maximum diameter of the pressing recess 32 (the diameter on the opening side of the pressing recess 32) is the outer diameter of the metal member 5. Bigger than. The outer shape of the presser member 30 is not particularly limited, but the circumferential shape of the presser recessed portion 32 (contour of the contact surface 30a) matches (exactly resembles) the outer diameter of the metal member 5. Thereby, in the mold clamping state, the contact surface 30a of the pressing member 30 contacts so as to cover the entire outer peripheral edge 5b of the metal member 5 on the bolt receiving surface 5a side.

  The pressing member 30 is always urged in the direction of pressing the metal member 5 by the spring 31, and can be moved into and out of the cavity from the movable die 20. Even in this clamped state, the presser member 30 protrudes into the cavity and has a function of blocking the injected molten resin.

  In addition, a stopper member 35 is disposed on the movable mold 20 so as to be orthogonal to the presser member 30. The stopper member 35 exists in a space independent of the cavity. The stopper member 35 can be advanced and retracted by an advancing / retreating unit (not shown) with respect to the receiving space 33 formed in a recessed shape on the peripheral surface of the pressing member 30. As the advancing / retreating means for advancing / retracting the stopper member 35 with respect to the presser member 30, a servo motor, a hydraulic cylinder, or the like can be used in addition to a cam mechanism for advancing / retreating the stopper member 35 with the opening / closing of the mold. The fixed mold 10 side surface 33a in the receiving space 33 of the pressing member 30 and the fixed mold 10 side surface 35a of the stopper member 35 are inclined surfaces inclined at the same angle.

  On the other hand, a positioning recess 11 corresponding to the outer diameter of the metal member 5 is formed in the fixed mold 10, and the metal member 5 is set in the positioning recess 11. As a result, the positioning of the metal member 5 is facilitated, and the displacement of the metal member 5 is prevented and stabilized during injection molding.

  Then, the effect at the time of insert molding is demonstrated. First, in the mold open state shown in FIG. 3, the metal member 5 is set in the positioning recess 11 of the fixed mold 10 so that the bolt receiving surface 5 a faces the pressing member 30. At this time, the protrusion amount of the pressing member 30 into the cavity is the maximum. Further, the stopper member 35 is in a retracted position where it does not enter the receiving space 33 of the presser member 30. Thereafter, when the movable mold 20 is moved and clamped, a cavity having a predetermined shape is formed between the fixed mold 10 and the movable mold 20 as shown in FIG. Further, as the mold is clamped, the contact surface 30 a of the presser member 30 contacts the outer peripheral edge 5 b of the metal member 5 on the bolt receiving surface 5 a side. At this time, since the contour of the contact surface 30a and the outer shape of the metal member 5 are the same, the metal member 5 contacts the contact surface 30a so that the entire outer peripheral edge 5b on the bolt receiving surface 5a side is covered by the pressing member 30. Touch. Further, when the metal member 5 comes into contact with the corner of the presser member 30, the metal member 5 may be scraped, but the outer peripheral edge 5 b on the bolt receiving surface 5 a side of the metal member 5 is the contact surface 30 a of the presser member 30. Therefore, the metal member 5 is not scraped.

  When the pressing member 30 comes into contact with the metal member 5, the pressing member 30 slightly enters the movable mold 20 against the urging force of the spring 31 by the clamping force. In this state, since the urging force from the spring 31 is acting on the pressing member 30, the metal member 5 is pressed by the pressing member 30. In addition, the stopper member 35 enters the receiving space 33 of the presser member 30 as the mold is clamped. Thereby, the state of the pressing member 30 pressing the metal member 5 is maintained. That is, the pressing member 30 is prevented from being unnecessarily immersed in the movable mold 20 due to the filling pressure of the molten resin. At this time, the inclined surface 35a of the stopper member 35 and the inclined surface 33a of the receiving space 33 are in contact with each other. As described above, since the contact surface between the stopper member 35 and the receiving space 33 is inclined, the variation in the height position of the presser member 30 due to the absorption of the height variation of the metal member 5 can be absorbed. And the receiving space 33 are kept in contact.

  In addition, even if the height dimension of the metal member 5 varies, the contact state between the presser member 30 and the metal member 5 does not change only by changing the amount of squeezing of the presser member 30 into the movable mold 20. That is, the variation in the height of the metal member 5 is absorbed by the amount of penetration of the presser member 30 into the movable mold 20. Further, even if the outer peripheral edge 5b of the metal member 5 has a shape variation or a radial dimension variation, the contact surface 30a of the presser member 30 is inclined with respect to the metal member 5, so that the contact It just changes position. Thereby, the shape variation and radial direction size variation of the metal member 5 are also absorbed.

  After that, molten resin is injected and filled into the cavity. At this time, since the contact surface 30a of the pressing member 30 surrounds the entire outer peripheral edge 5b of the metal member 5, the molten resin is blocked by the pressing member 30 and flows onto the bolt receiving surface 5a of the metal member 5. There is no. Moreover, although the molten resin is filled with a relatively high pressure, the pressing member 30 is pressed by the biasing force of the spring 31 and the stopper member 35, and the contact area between the inclined surface 30a and the outer peripheral edge 5b is small. The molten resin is effectively prevented from flowing onto the bolt receiving surface 5a of the metal member 5.

  When the molten resin is cooled and solidified, if the mold is opened again, the resin molded product 1 shown in FIG. 2 is obtained with the metal member 5 disposed. In the resin molded product 1, the entire peripheral surface of the metal member 5 is covered with resin, but the bolt receiving surface 5 a does not contain resin and is not covered with resin. Moreover, the surface of the resin covering the peripheral surface of the metal member 5 is inclined toward the opposite side of the bolt receiving surface 5a and is at a position lower than the bolt receiving surface 5a. Thereby, the bolt receiving surface 5a is exposed to the outside. Therefore, when the bolt B is inserted into the central through hole 4 and fastened, the head Bh of the bolt B comes into contact with the bolt receiving surface 5a of the metal member 5 without being obstructed by the resin, and the fastening force by the bolt B is increased. It is received by the metal member 5. Thereby, the fall of a bolt fastening force and the damage of the resin molded product 1 are prevented.

  On the other hand, when the outer peripheral edge 5b on the bolt receiving surface 5a side is a chamfered tapered surface, the inclination angle of the contact surface 30a of the pressing member 30 and the outer peripheral edge 5b on the bolt receiving surface 5a side should be the same. In this case, the outer peripheral edge 5b is not covered with the resin. However, as described above, the outer peripheral edge 5b has variations in shape due to manufacturing variations.

  For example, as shown in FIG. 5, when the inclination angle of the outer peripheral edge 5b on the bolt receiving surface 5a side of the metal member 5 is smaller than the inclination angle of the contact surface 30a of the pressing member 30, the outermost edge of the outer peripheral edge 5b. Will come into contact with the contact surface 30a. Also in this case, as shown in FIG. 6, in the obtained resin molded product 1, the outer peripheral edge 5b of the metal member 5 is not covered with resin.

  On the other hand, as shown in FIG. 7, when the inclination angle of the outer peripheral edge 5 b on the bolt receiving surface 5 a side of the metal member 5 is larger than the inclination angle of the contact surface 30 a of the pressing member 30, The innermost edge comes into contact with the contact surface 30a. In this case, as shown in FIG. 8, in the resin molded product 1 to be obtained, the outer peripheral edge 5b of the metal member 5 is covered with the resin over the entire axial direction. As long as the bolt receiving surface 5a is not covered with resin, there is no problem even if the outer peripheral edge 5b is covered with resin. On the contrary, if the outer peripheral edge 5b is covered with resin, the outer peripheral edge 5b is protected by the resin, and the merit that it is hard to be damaged is obtained.

  Some metal members 5 have an outer peripheral edge 5b having an R shape (curved surface). In this case, as shown in FIG. 9, the central portion in the axial direction of the outer peripheral edge 5b comes into contact with the contact surface 30a. Therefore, in the resin molded product 1 obtained in this way, as shown in FIG. 10, a part of the outer peripheral edge 5b in the axial direction is covered with the resin. Even in this case, there is an advantage that a part of the outer peripheral edge 5b is protected by the resin and is hardly damaged.

  As mentioned above, although typical embodiment of this invention was described, it is not restricted to this, A various change is possible in the range which does not deviate from the summary of this invention.

  For example, as shown in FIG. 11, the movable mold 20 can be formed with a protruding portion 20a that abuts against the bolt receiving surface 5a of the metal member 5 in the clamped state. The protrusion 20a has a diameter larger than the diameter of the central through hole 4 of the metal member 5, and is always urged in a direction to hold the metal member 5 by the spring 20b. As a result, the protrusion 20a absorbs the variation in the height of the metal member 5 and presses the metal member 5, and further increases the pressing force for pressing the metal member 5, thereby causing the displacement of the metal member 5 in the radial direction. It is also effective for prevention. In this case, a through hole may be provided in the center portion in the radial direction of the pressing member 30, and the protruding portion 20a may be inserted into the through hole. Further, the spring 31 is also disposed around the protruding portion 20a. It should be noted that the variation in the height of the metal member 5 can be absorbed by allowing the presser member 30 to freely move in and out.

  Alternatively, the length of the projecting portion 20a is made longer and the diameter of the projecting portion 20a is made smaller than the diameter of the central through hole 4 of the metal member 5, so that the projecting portion 20a penetrates the center of the metal member 5 in the clamping state. It can also be designed to be inserted into the hole 4. In this case, displacement of the metal member 5 in the radial direction is prevented.

  In each drawing, the movable mold 20 is shown in a state of moving up and down, but the movable mold 20 may be moved in the left-right direction with the fixed mold 10 and the movable mold 20 turned sideways. Further, the pressing member 30 and the stopper member 35 may be provided in the fixed mold 10 so that the pressing member 30 can be protruded and retracted from the fixed mold 10 into the cavity. In this case, if the movable mold 20 moves in the vertical direction, the metal member 5 is set in the pressing recess 32 of the pressing member 30. Therefore, the outer peripheral edge 5b of the metal member 5 on the bolt receiving surface 5a side and the contact surface 30a of the pressing member 30 are in contact from the mold open state. However, since the presser member 30 remains in and out of the cavity by the mold clamping, the above-described operational effects same as those of the present invention can be obtained. Alternatively, the pressing member 30 can be provided on both the fixed mold 10 and the movable mold 20. In this case, it is possible to effectively prevent the axial end surface of the metal member 5 opposite to the bolt receiving surface 5a from being covered with the resin.

  The pressing member 30 is urged by a spring 31, and a rubber material having a high elastic force is interposed between the mold on the side where the pressing member 30 is provided and the pressing member 30, or a dimension is measured by an air cylinder, a hydraulic cylinder, or the like. It can also be mechanically energized while absorbing variations.

  The stopper member 35 is not always necessary. As long as the stopper member 35 is arranged so as to be orthogonal to the pressing member 30, the stopper member 35 can be provided not only to enter the receiving space 33 of the pressing member 30 but also to be in sliding contact with the upper surface of the pressing member 30. In this case, the inclined surface 33 a is formed on the peripheral edge of the upper surface of the pressing member 30. The stopper member 35 is preferably provided not only at one place but also at a plurality of places. If the presser member 30 is cylindrical, at least two locations facing each other, preferably three locations at equal intervals in the circumferential direction, are provided. Thereby, in addition to the holding force of the pressing member 30 being increased, the holding member 30 can be stably held. The number of the stopper members 35 is preferably four or less. This is because even if it is too much, the structure becomes too complicated. If the pressing member 30 has a prism shape, the same number of stopper members 35 as the side surfaces of the prism can be provided.

  The mold on the side where the pressing member 30 is not provided does not necessarily require the positioning recess 11 for the metal member 5 set. Further, there is no limitation on the relative relationship (shape) between the presser member 30 and the stopper member 35 as long as the presser member 30 can be prevented from entering the movable mold 20 unnecessarily due to the filling pressure of the molten resin. For example, the stopper member 35 can be brought into contact with the side surface or the upper surface of the pressing member 30 without providing the receiving space 33 in the pressing member 30.

DESCRIPTION OF SYMBOLS 1 Resin molded product 3 Bolt fixing | fixed part 4 Center through-hole 5 Metal member 5a Bolt receiving surface 5b Outer peripheral edge 10 Fixed mold | type 11 Positioning recessed part 20 Movable mold | type 20a Protruding part 30 Pressing member 30a Abutting surface 32 Head Bs Screw shaft

Claims (6)

An insert molding die for injection molding a resin molded product in which a cylindrical metal member having a central through hole is disposed by insert molding on the inner peripheral surface of the bolt insertion hole,
A fixed mold, movable with respect to the fixed mold, a movable mold that forms a cavity together with the fixed mold in a clamped state, and can be moved into and out of the cavity from at least one of the fixed mold or the movable mold A pressing member that presses the metal member set in advance in the cavity,
The pressing member is always urged in the pressing direction of the metal member, and has a contact surface that contacts the entire outer peripheral edge of the metal member in a clamped state.
The insert molding die, wherein the contact surface is a tapered surface inclined with respect to the outer peripheral edge of the metal member.   The stopper member according to claim 1, further comprising a stopper member that is arranged so as to be movable forward and backward with respect to the presser member orthogonal to the presser member and that holds the state of the presser member pressing the metal member in a clamped state. Insert molding die.   The insert molding die according to claim 1 or 2, wherein a positioning recess for setting the metal member is formed in the die facing the pressing member.   The mold provided with the presser member is formed with a protruding portion that comes into contact with one axial surface of the metal member in a clamped state or is inserted into a central through hole of the metal member. The insert molding die according to any one of claims 1 to 3. On the inner peripheral surface of the bolt insertion hole is a resin molded product in which a cylindrical metal member having a central through hole is disposed by insert molding,
The entire peripheral surface of the metal member is covered with resin,
There is no resin on at least one surface in the axial direction of the metal member,
The resin molded product in which the surface of the resin covering the peripheral surface is inclined toward the other surface side in the axial direction of the metal member and is lower than the one surface of the metal member. The resin molded product according to claim 5, wherein the outer peripheral edge on one side of the metal member is entirely or partially covered with resin in the axial direction.

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