JP3400707B2 - Undercut molds and mold parts - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an undercut molding die and a die part.

[0002]

2. Description of the Related Art An undercut molding core is obliquely penetrated through a lower mold, and when the upper mold is opened and a molded product is pushed up from the lower mold, the undercut molding core is pushed up at the same time and the tilted posture of the core is used. FIG. 13 shows a conventional mold in which the undercut molding surface is removed from the undercut portion of the molded product. That is, 100 is an upper mold, 101 is a lower mold, 102 is a core for undercut molding, 103 is a protruding member, 104 is a slide base, 105 is a guide rod, 106 is a guide plate, 107 is a holding base, 1
Reference numeral 08 is a molded product, and 109 is a protrusion means.

FIG. 13 shows a state where the molding is completed. Molded product 1
When taking out 08, the upper die 100 is opened with respect to the lower die 101, and then the molded product 108 is pushed up by the ejection means 109 and separated from the lower die 101. In this case, the ejecting member 103 is moved simultaneously with the ejecting means 109 to raise the core 102 in the inclined direction, so that the undercut molding surface 110 is slid and separated from the undercut portion 108a of the molded product 108. In such a lifting operation of the core 102, when the protruding member 103 is lifted, the slide base 104 slides in the direction of the arrow along the longitudinal direction of the guide rod 105, whereby the core 10 is moved.
The core 102 is pushed up while guiding the rear end of 2.
The core 102 returns to its original position when the protruding member 103 is retracted.

As described above, since the guide rod 105 guides the rear end side of the core 102, the core 102 can be smoothly slid, and the lower mold 1 for penetrating the core 102 is provided.
It is possible to prevent the sliding surface on the rear end side of the guide through hole 101a of No. 01 from being worn away.

[0005]

However, in this conventional example, a space for providing the guide rod 105 is required on the side of the core 102, the mold becomes large, the number of parts increases, and There is a drawback that the mold assembly becomes complicated. Therefore, an object of the present invention is to provide a mold for undercut molding and a mold part that can reduce the size of the mold, reduce the number of parts, and facilitate assembly.

[0006]

An undercut molding die according to claim 1 has an upper die and a guide through hole inclined with respect to an opening / closing direction of the die on a molding surface and faces the upper die. And a lower die that is slidably inserted in the guide through hole and has an undercut molding surface at the tip and a guide at the rear end.
Core with receiving part and mounting on the rear end of this core
Section, a protrusion member for slidably mounting the mounting section to slide the core along the guide through hole, and a rear end side of the core with the rear end side thereof slidably inserted into the guide receiving section. And a guide rod for guiding in the moving direction of the core.

According to the undercut molding die of the first aspect, since the guide receiving portion is provided on the core to guide the guide rod, the guide rod is located on the moving direction line of the core. And the mold can be made smaller,
Moreover, the number of parts can be reduced, and therefore, the assembling can be facilitated. The undercut molding die component according to claim 2, wherein a core having a guide receiving portion at a rear end thereof is slidably inserted into an inclined guide through hole of a lower die facing the upper die, and A mounting portion that is slidably mounted to a protruding member that is provided at a rear end portion and that protrudes the core toward the tip, and a rear end side of the core that is inserted into the guide receiving portion in the moving direction of the core. And a guide rod for guiding.

According to the undercut molding die component of the second aspect, the same effect as that of the first aspect can be obtained. Claim 3
The undercut molding die component described is a core that is slidably inserted into an inclined guide through hole of a lower mold facing the upper mold and has an undercut molding surface at the tip and a guide receiving portion at the rear end. A mounting portion slidably attached to a projecting member that is provided at the rear end portion of the core and projects the core toward the front end; and a rear end side of the core that is inserted into the guide receiving portion. And a guide rod for guiding in the moving direction of the core.

According to the undercut molding die component of the third aspect, the same effect as that of the first aspect can be obtained. Claim 4
The undercut molding die component according to claim 2 or 3, wherein the attachment portion is provided so as to project in a direction orthogonal to a mold opening direction of the rear end portion of the core and an inclination direction of the core. It is composed of a pin and a rail which has a slit through which the pin is slidably inserted and which is attached to the protruding member.

According to the undercut molding die component of the fourth aspect, in addition to the same effect as the second or third aspect, the core is slidably ejected for easy assembly by attaching the rail to the ejection member. It can be attached to a member. The undercut molding die component according to claim 5, wherein the rail penetrates a long hole along one of the opposite sides of the rectangular parallelepiped in the longitudinal direction and is adjacent to the one opposite side. The surface is formed with slits communicating with the elongated holes along the longitudinal direction, and the rear end of the core is slidably inserted into the elongated holes and both ends of the pins are slidable into the slits. Is to be inserted into.

According to the die component for undercut molding of the fifth aspect, in addition to the same effect as that of the fourth aspect, a pair of slits for supporting both ends of the pin are provided in one rail, so that the protrusion member is provided. Easy to install. The undercut molding die component according to claim 6 is the one according to claim 2,
In claim 3, claim 4 or claim 5, the guide rod is attached to a mounting member so that a rear end portion of the guide rod is rotatable, and the mounting member is mounted to a holding base.

According to the undercut molding die component of claim 6, in addition to the same effects as those of claim 2, claim 3, claim 4, or claim 5, the guide rod is rotated through the mounting member. Since it is movably attached to the holding base, the attachment of the attachment member becomes easy. The undercut molding die component according to claim 7 is the mold component according to claim 2, 3, 4, or 5, wherein the guide receiving portion of the core is formed along a longitudinal direction of the core. It is a tubular body with both ends open.

According to the undercut molding die component of claim 7, in addition to the same effect as in claim 2, claim 3, claim 4, or claim 5, a width equal to or greater than the width of the core is provided. It can be used with small cores by inserting a guide rod. An undercut molding die component according to claim 8 is the mold component according to claim 2, 3, 4, or 5, wherein the core has a core piece having an undercut molding surface, and A holding portion having a detachable portion for detachably attaching the end at the front end and the guide receiving portion at the rear end side is provided, and the attachment portion is provided at the rear end side of the holding portion .

According to the undercut molding die component of the eighth aspect, in addition to the same effects as those of the second, third, fourth or fifth aspect, the undercut molding die component is held against a plurality of types of core pieces. Since the parts can be shared, the core can be easily manufactured.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of the present invention will be described with reference to FIGS. That is, this undercut molding die has an upper mold 1, a lower mold 2, a core 3, a protruding member 4, and a guide rod 5. Upper mold 1
Is configured to move downward when the mold is clamped and move upward when the mold is opened. 6 is the molding surface.

The lower die 2 has a guide through hole 9 inclined with respect to the opening / closing direction of the die on the molding surface and faces the upper die 1. The inclination angle of the guide through hole 9 is determined according to the shape of the undercut portion 36a of the molded product 36 (see FIG. 6) to be molded. Reference numeral 7a denotes a molding surface for molding the outer surface side of the undercut portion 36a of the molded product 36, and 8 denotes a template for holding the lower mold 2, which is fixed in the embodiment. Reference numeral 10 is a loose fitting hole communicating with the guide through hole 9.

The core 3 is slidably inserted into the guide through hole 9 and has an undercut molding surface 11 at its tip.
The rear end has a mounting portion 12 and a guide receiving portion 13.
The mounting portion 12 of the embodiment has a pin 14 protruding in a direction orthogonal to the mold opening direction of the rear end portion of the core 3 and the inclination direction of the core 3, and a slit 16 that slidably inserts the pin 14. Rail 17 attached to the protruding member 4
Consists of. The rail 17 penetrates the long hole 15 along one side surface of the rectangular parallelepiped in the longitudinal direction, and has slits 16 on both side surfaces adjacent to the one opposite side surface that communicate with the long hole 15 along the longitudinal direction. Is forming. The rail 17 is attached to the recess 18 of the protruding member 4 so that the rear end of the core 3 is slidably inserted into the elongated hole 15 and both ends of the pin 14 are slidably inserted into the slit 16. In this case, when the rear end of the core 3 is inserted into the elongated hole 15 and the center of the pin 14 is attached to the core 3 through the slit 16, both ends of the pin 14 are supported by the slit 16 to be assembled. Further, the elongated hole 15 of the rail 17 is attached to the protruding member 4 so as to be oriented in the direction orthogonal to the mold opening / closing direction and in the direction in which the core 3 is inclined from the mold opening / closing direction.

The guide receiving portion 13 of the embodiment is a blind hole dug in from the rear end surface of the core 3. When forming the core 3, for example, as shown in FIGS. 3 (e) and 3 (f), the pin hole 30 and the guide receiving portion 13 are formed in a rod-shaped body having a rectangular cross section, for example, and the user can adjust the inclination angle. Then, the rear end surface 35 is horizontally cut to form the inclined surface 35a and the undercut molding surface 11 is processed.

The projecting member 4 has the mounting portion 12 slidably mounted thereon and slides the core 3 along the guide through hole 13. In the embodiment, the rail 17 is housed in the recess 18 of the protruding member 4 and attached and fixed. 33 is core 3
And a loose fitting hole for loosely fitting the guide rod 5.
The guide rod 5 is slidably inserted into the guide receiving portion 13 to guide the rear end side of the core 3 in the moving direction of the core 3.
A rear end portion of the guide rod 5 of the embodiment is rotatably attached to the attachment member 20, and the attachment member 20 is attached to the holding base 19. The mounting member 20 has a groove 34 for inserting the base portion 5a provided at the rear end of the guide rod 5, and has pin receiving holes penetrating both sides of the groove 34 to fit the pins 21.
The screw insertion hole 22 is formed adjacent to the groove 34. The guide rod 5 is rotatably attached to the attachment member 21 by the pin 21, the screw 23 is inserted into the screw insertion hole 22, and the holder 1
When it is screwed into the screw hole 24 formed in 9, the mounting member 20 is mounted in the recess 45 of the holding base 19.

In such an undercut molding die, the undercut molding die component has an inclined guide through hole 9 of the lower mold 2 facing the upper mold 1 as shown in FIG.
A core 3 which is slidably inserted into the underside and has an undercut molding surface 11 at the front end and a guide receiving portion 13 at the rear end.
A mounting portion 12 provided at the rear end of the core 3 and slidably mounted on a projecting member 4 for projecting the core 3 toward the front end; and a rear end side of the core 3 inserted into the guide receiving portion 13. And a guide rod 5 for guiding the core in the moving direction of the core 3.

FIG. 6 shows the releasing operation after molding. FIG. 3A shows a state in which the molding material is injected into the cavity formed by the upper mold 1, the lower mold 2 and the core 3 and cured to mold the molded product 36 having the undercut portion 36a. FIG. 2B shows a state in which the upper die 1 is moved and the die is opened to expose the molded product 36. FIG. 3C shows a state in which the molded product 36 is ejected from the lower mold 2 by the ejecting means (not shown) and the ejecting member 4 is moved upward. At this time, the front end side of the core 3 is guided by the guide through hole 9 of the lower mold 2, the rear end side of the core 3 is guided by the guide rod 5 and the rail 17, and the pin 14 is guided by the slit 16 to guide the core 3
The core 3 smoothly moves in the longitudinal direction while the rear end side moves along the longitudinal direction of the elongated hole 15 of the rail 17. Further, since the molded product 36 moves toward the upper mold 1, the undercut molding surface 17 of the core 3 moves away from the undercut portion 36a of the molded product 36. The same figure (d)
Is in a state where the protruding member 4 is moved to the maximum movement position and the undercut molding surface 17 is completely separated from the undercut portion 36a, and the molded product 36 can be removed from the core 3.

In the next molding, the protrusion member 4 is lowered, the upper mold 1 is lowered to the lower mold 2 and the mold is closed, as shown in FIG. According to the first embodiment, since the core 3 is provided with the guide receiving portion 13 and guided by the guide rod 5, the guide rod 5 is located on the moving direction line of the core 3, so that the guide rod 5 is less expensive than the conventional example. The mold can be downsized, and the number of parts can be reduced, so that the assembly can be facilitated.

Further, the above-mentioned undercut molding die parts can exhibit the same effects. Further, the mounting portion 12 is provided with a pin 1 projecting in a direction orthogonal to the mold opening direction of the rear end portion of the core 3 and the inclination direction of the core 3.
4 and a rail 17 having a slit 16 for slidably inserting the pin 14 and attached to the protruding member 4.
Therefore, by attaching the rail 17 to the protrusion member 4, the core 3 can be slidably attached to the protrusion member 4 easily by assembling.

Further, the rail 17 penetrates the long hole 15 along one longitudinal side on one side face of the rectangular parallelepiped, and the slit 16 on both side faces adjacent to the one side face communicates with the long hole 15 along the longitudinal direction. Since the rear end portion of the core 3 is slidably inserted into the elongated hole 15 and both ends of the pin 14 are slidably inserted into the slits 16, a pair of supporting both ends of the pin 14 is formed. By providing the slit 16 of 1 in one rail 17, the attachment to the protruding member 4 is facilitated.

Further, since the guide rod 5 is rotatably attached to the mounting member 20 at its rear end and the mounting member 20 is mounted to the holding base 19, the mounting member 20 can be easily mounted. FIG. 7 shows a modification of the core. The core is made slightly thinner than that of the first embodiment, and the pin 1 of the mounting portion 12 is used.
Protrusion 3 for forming pin hole 39 in the portion where 4 is attached
8 is provided.

The second embodiment of the present invention is shown in FIG. That is, this undercut molding die is
In the embodiment, the guide receiving portion 13 of the core 3 is a tubular body formed along the longitudinal direction of the core 3 and having both ends opened. Further, the mounting member 20 'has a screw hole 41
Is formed, and the tip of the screw 23 inserted into the screw insertion hole 42 formed in the holding table 19 is screwed in and attached to the recess 43 formed in the holding table 19.

Others are the same as those in the first embodiment. The third embodiment of the invention from 9 is shown in FIG. 12. That is, this undercut molding die is
In the embodiment, the core 3 has the core piece 47 having the undercut molding surface 11 and the attaching / detaching portion 49 for detachably attaching the rear end of the core piece 47, and the attaching portion 12 on the rear end side. And a holding portion 48 having the guide receiving portion 13.

The core piece 47 of the embodiment has, for example, a concave hooking portion 50 formed on the side surface of the rear end thereof, and the holding portion 48 is fitted with a fitting groove 51, preferably a rearward fitting portion, at the rear end of the core piece 47. A fitting groove 51 that closely fits to the three adjacent side surfaces of the end portion is formed, and, for example, a convex hook receiving portion 52 that is hooked on the hook portion 50 is formed, and the attaching / detaching portion 49 is slidable on the holding portion 48. It is a cylindrical body that is fitted onto the
3 is provided, and an inward projection 54 is provided at the tip of the extending piece 53. A recess that slides the attachment / detachment portion 49 onto the fitting groove 51 in which the core piece 47 of the holding portion 48 is fitted to lock the inward projection 54 with the rear end portion of the core piece 47 covered by the attachment / detachment portion 49. Forming 55.

Others are the same as those in the first embodiment. In the present invention, the upper die and the ejection member are movable when the die is opened, but the upper die and the ejection member may be fixed and the lower die may be moved when the die is opened.

[0030]

According to the undercut molding die of the first aspect of the present invention, since the guide receiving portion is provided on the core to guide the guide rod, the guide rod is positioned on the moving line of the core. The die can be downsized and the number of parts can be reduced as compared with the above, and therefore, the assembling can be facilitated.

According to the undercut molding die component of the second aspect, the same effect as that of the first aspect can be obtained. Claim 3
According to the described undercut molding die component, the same effect as that of the first aspect is provided. According to the undercut molding die component of claim 4, in addition to the same effect as in claim 2 or 3, the core is slidably mounted on the protruding member for easy assembly by mounting the rail on the protruding member. be able to.

According to the die component for undercut molding of the fifth aspect, in addition to the same effect as that of the fourth aspect, a pair of slits for supporting both ends of the pin are provided in one rail, so that the protrusion member is provided. Easy to install. According to the undercut molding die component of claim 6, in addition to the same effect as that of claim 2, claim 3, claim 4, or claim 5, the guide rod is rotatable through the mounting member. Since it is attached to the holding base, the attachment member can be easily attached.

According to the undercut molding die component of claim 7, in addition to the same effect as in claim 2, claim 3, claim 4 or claim 5, a width equal to or greater than the width of the core is provided. It can be used with small cores by inserting a guide rod. According to the undercut molding die component according to claim 8, in addition to the same effect as that of claim 2, claim 3, claim 4, or claim 5, a holding portion is shared for a plurality of types of core pieces. This makes it easier to manufacture the core.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a mold clamping state according to a first embodiment of this invention.

FIG. 2 is a partial sectional side view of an undercut molding die component.

FIG. 3 shows the rear end of the core, (a) is a front view,
(B) is its side view, (c) is an end view of the rear end face, (d)
Is an end view of the rear end face as seen in the longitudinal direction, (e) is a side view of the state before the rear end face is cut obliquely, and (f) is its end view.

FIG. 4 shows a rail, (a) is a front view, (b) is a plan view, and (c) is a sectional view.

5A and 5B show a mounting portion, FIG. 5A is a plan view, FIG. 5B is a sectional view, FIG. 5C is a bottom view, and FIG.

FIG. 6 is an explanatory diagram illustrating a mold opening operation.

FIG. 7 shows a rear end portion of a modified embodiment of the core, (a) is a front view, (b) is a front view, and (c) is a rear end view.

FIG. 8 is a partial cross-sectional view of the second embodiment.

FIG. 9 is a cross-sectional view of a mold component according to a third embodiment.

FIG. 10 shows the core piece, (a) is a front view, (b)
Is a side view thereof.

FIG. 11 is a plan view of a detachable part.

FIG. 12 is a side view of the holding section showing a holding section, in which (a) is a cross section of the attachment / detachment section, and (b) is a sectional view thereof.

FIG. 13 is a partial cross-sectional view of a conventional example.

[Explanation of symbols]

1 Upper mold 2 Lower mold 3 core 4 protruding member 5 Guide rod 9 Guide through hole 11 Undercut molding surface 12 Mounting part 13 Guide receiving part 14 pin 15 long holes 16 slits 17 rails 19 holding table 20 Mounting member 47 core pieces 48 holding part 49 Detachable part

Claims (8)

(57) [Claims] 1. An upper die, a lower die having a guide through hole inclined with respect to the opening and closing direction of the die on a molding surface and facing the upper die, and a tip slidably inserted into the guide through hole. A core having an undercut molding surface at its rear end and a guide receiving portion at its rear end, and a mounting portion at the rear end of this core,
This mounting portion is slidably mounted to slide the core along the guide through hole, and the guide receiving portion is slidably inserted to move the rear end side of the core. Mold for undercut molding that has a guide rod that guides in the direction. 2. A core having a guide receiving portion at a rear end portion slidably inserted into a slanted guide through hole of a lower die facing the upper die, and the core provided at the rear end portion of the core. An under part having a mounting part slidably mounted on a projecting member for projecting toward the tip and a guide rod inserted into the guide receiving part and guiding the rear end side of the core in the moving direction of the core. Mold parts for cut molding. 3. A core which is slidably inserted into an inclined guide through hole of a lower mold facing the upper mold and has an undercut molding surface at the front end and a guide receiving portion at the rear end, and the core of the core. A mounting portion that is slidably mounted to a protruding member that is provided at a rear end portion and that protrudes the core toward the tip, and a rear end side of the core that is inserted into the guide receiving portion in the moving direction of the core. Mold parts for undercut molding with guide rods for guiding. 4. The mounting portion has a pin projecting in a direction orthogonal to a mold opening direction of the rear end portion of the core and a tilt direction of the core, and a slit for slidably inserting the pin. The undercut molding die component according to claim 2 or 3, comprising a rail attached to the protrusion member. 5. The slit, wherein the rail penetrates the elongated hole along one longitudinal side of one side surface of the rectangular parallelepiped, and communicates with the elongated hole along the longitudinal direction on both side surfaces adjacent to the one opposite side surface. 5. The undercut molding gold according to claim 4, wherein the rear end of the core is slidably inserted into the elongated hole and both ends of the pin are slidably inserted into the slits. Mold parts. 6. A guide rod, a rear end portion of which is rotatably attached to an attachment member, and the attachment member is attached to a holding base.
Mold parts for undercut molding described. 7. The guide receiving portion of the core is a tubular body which is formed along the longitudinal direction of the core and has both ends opened, according to claim 2, claim 3, claim 4 or claim 5. Undercut molding die parts. 8. The core comprises: a core piece having an undercut molding surface; and a holding portion having a guide receiving portion on the rear end side and a detachable portion for detachably attaching the rear end of the core piece. Tona is, the mounting portion on the rear end side of the holding portion
Claim 2 having, claim 3, claim 4 or claim 5
Mold parts for undercut molding described.