JP2544503Y2 - Synthetic resin injection mold - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a resin injection mold for molding a synthetic resin article having a bent end.

[0002]

2. Description of the Related Art As shown in FIG. 5, for example, a conventional molding die for injection molding a synthetic resin molded product having a terminal bent in a pot bottom cross-sectional shape has a lower die 1 and a lower die 1 as shown in FIG. A main core 3 fixed to the upper mold member 2 moving up and down and forming a gap corresponding to the thickness of the molded product W with the lower mold 1;
As shown in the figure, an undercut boss 7 is formed on the upper surface to form a cutout recess 4a for forming the bent terminal E communicating with the gap, and the cylinder 5 is guided by the main core 3 so as to be movable in the horizontal direction. The slide core 4 moves forward and backward with respect to the side surface of the lower die 1, and the upper die 6 fixed to the upper die member 2 and in planar contact with the upper surface of the slide core 4 and in contact with the side surface of the lower die 1. It is composed.

[0003] The above-mentioned mold moves down the upper mold member 2 and
The slide core 4 is moved to the forward end, and a gap corresponding to the thickness of the molded product W is formed by the lower mold 1 and the main core 3.
The upper surface of the slide core 4 and the upper die 6 contacting the upper surface form the notch recesses 4a for forming the bending terminals E which communicate with the gaps, and the resin is injected into these gaps and the notch recesses 4a for bending. A molded article W having a terminal E is formed.

[0004]

When the molded product W molded by the molding die is released from the lower die 1, the slide core 4 is moved backward by the stroke S as shown in FIG.
Pull in the bending terminal E and insert the bending terminal E into the lower mold 1
Then, the upper mold member 2 is lifted up and removed from the mold so that the bent terminal E does not interfere with the side surface of the lower mold 1 by being separated from the side surface of the lower mold 1.

[0005] However, when the slide core 4 is moved backward to retract the bent terminal E, the upper surface E1 of the bent terminal E and the upper die 6 slide relative to each other, thereby causing a sliding scratch on the upper surface E1 of the bent terminal E. There is a problem that occurs. This problem can be solved by stopping the upper die after moving up by several tens of millimeters (intermediate stop) and moving the slide core 4 backward, but there is a problem that the molding time is increased and the productivity is reduced.

An object of the present invention is to provide a synthetic resin injection mold that solves the above-mentioned conventional problems.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the gist of the present invention is to provide a lower die, an upper die member which moves up and down with respect to the lower die, and a vertical direction with respect to the upper die member. A main core forming a gap corresponding to the thickness of the molded product between the lower mold and the main core, a cutout recess for forming the bent end formed in communication with the gap on the upper surface, and the upper mold member. A guide post protruding with an axis directed in the moving direction, and being guided by the main core so as to be movable in a direction orthogonal to the moving direction of the upper die member, to advance and retreat with respect to a side surface of the lower die by a cylinder. A slide core that is fixed to the upper die member and has a tapered surface that slopes down in the forward direction of the slide core; and a guide block supported and movably supported by the cam block in parallel with the slide core. Guide post staff Hole and the comprises a tapered surface pair contact the tapered surface of the cam block the slide core of the upper surface and the plane contact, and those constructed from contact with the slide upper die and a side surface of the lower mold.

[0008]

[Function] The present invention is designed to remove a molded product from a lower mold.
When the slide core is retracted, the slide upper die is integrally moved backward, and then the upper die member is moved upward to raise the slide upper die together with the upper die member. As a result, there is no relative sliding on the upper surface of the bent end of the molded product, eliminating the cause of the occurrence of sliding flaws and eliminating the need for the intermediate stop operation of the mold.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a lower die, and 2 denotes an upper die member which moves up and down with respect to the lower die 1. Reference numeral 3 denotes a main core that forms a gap corresponding to the thickness of the molded product W with the lower mold 1. The main core 3 has an elongated hole 9 in the vertical direction. The upper die member 2 has a shaft 10 fixedly mounted on a support member 8 integrated therewith. The core 3 is supported by the upper die member 2 so as to be vertically movable relative to the upper die member 2 by the length of the elongated hole 9.

Reference numeral 4 denotes a slide core. The slide core 4 is guided by the main core 3 so as to be movable in a direction perpendicular to the direction of movement of the upper die member 2, and is provided by a cylinder 5 so as to be able to move forward and backward with respect to the side surface of the lower die 1. As shown in FIG. 2, the upper surface of the slide core 4 has a notch concave portion 11 for forming the bending terminal E communicating with a gap corresponding to the thickness of the molded product W and an axis line in the moving direction of the upper die member 2. And a guide post 15 protruding toward it.

Reference numeral 12 denotes a cam block fixed to the upper die member. The cam block 12 has a tapered surface 14 that is inclined downward in the forward direction of the slide core 4. As shown in FIG. 3, a slide upper die 13 is supported by the cam block 12 so as to be movable in parallel with the slide core 4.

The upper slide die 13 has an engagement hole 16 with which a guide post 15 protruding from the slide core 4 is engaged and disengaged, and a tapered surface 14 which is in contact with the tapered surface 14 of the cam block 12. A flat surface contact with the upper surface of the slide core 4 and a slope contact 1 with the side surface of the lower mold 1.
7

Next, the operation of the present invention will be described. At the time of molding the molded product W, as shown in FIG. 1, the upper mold member 2 is located at the lower end, and the main core 3 forms a gap corresponding to the thickness of the molded product W with the lower mold 1. ing. At this time, the shaft 10 fixed to the support member 8 integral with the upper die member 2 is located at the lower end of the elongated hole 9 provided in the main core 3 and is positioned at the lower end of the main core 3 located at the lower end. On the other hand, the upper mold member 2 is in a state of being relatively movable upward.

Further, the slide core 4 moves to the forward end,
The upper slide die 13 engaged with the slide core 4 via the guide post 15 is also moved to the forward end together with the slide core 4, comes into contact with the tapered surface 14 of the cam block 12, and contacts the upper surface of the slide core 4. The flat end is in contact with the side surface of the lower mold 1 so as to contact the inclined surface 17 to communicate with the notch recess 11 for forming the bent end E and the gap corresponding to the thickness of the molded product W. Thus, by injecting the resin into the gap, a molded product W having the bent terminal E is formed.

When the molded article W is released from the lower mold 1, the slide core 4 is moved backward as shown in FIG. As a result, the slide upper die 13 also retreats integrally with the slide core 4, the cam block 12 and the tapered surface 14 of the slide upper die 13 are separated, and the bending end E is sandwiched between the slide core 4 and the slide upper die 13. In this manner, the vicinity of the bending terminal E is temporarily elastically deformed and separated from the side surface of the lower mold 1, so that it is in a demolding state without interfering with the side surface of the lower mold 1.

Next, when the upward movement of the upper die member 2 is started, as shown in FIG. 4B, the shaft 10 located at the lower end of the elongated hole 9 provided in the main core 3 is moved to the elongated hole 9. The upper mold member 2 moves relative to the main core 3 located at the lower end until the upper core member 2 is located at the upper end of the upper die. During this time, the main core 3 is left at the lower end, and the upper slide 13 is the cam block 1.
The slide core 4 is lifted directly upward and separated from the upper surface of the slide core 4.

Thereafter, the main core 3 is lifted by the upper die member 2 by the shaft 10, and the molded product W is released from the lower die 1 and is removed from the main core 3 to temporarily deform the elastically deformed terminal E. The area is elastically restored.

[0018]

As described above, the synthetic resin injection molding die according to the present invention is supported by the upper die member which moves up and down with respect to the lower die so as to be vertically movable relative to the upper die member. A main core forming a gap corresponding to the thickness of the molded product between the mold, a notch recess for forming the bent end formed on the upper surface communicating with the gap, and a projection protruding in the moving direction of the upper mold member. A slide core having a guide post, which is guided by the main core so as to be movable in a direction perpendicular to the moving direction of the upper die member, and which is advanced and retracted with respect to a side surface of a lower die by a cylinder; and A cam block fixedly mounted on the slide core and having a tapered surface having a downward slope with respect to the forward direction of the slide core; and an engagement hole of the guide post, the cam being supported by the cam block so as to be movable in parallel with the slide core. block When the molded product is released from the lower mold, the slide core is formed of a slide upper mold having a taper surface that is in contact with the taper surface, making planar contact with the upper surface of the slide core, and making contact with the side surface of the lower mold. When the bending terminal is retracted, the slide upper die and the slide core are integrally retracted in a form sandwiched between the slide core and the slide upper die, and then the slide upper die is moved directly upward. Eliminates the relative sliding action, prevents the occurrence of sliding scratches on the upper surface of the bent terminal, and eliminates the need for intermediate stopping of the mold, thereby improving productivity.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of the present invention.

FIG. 2 is an enlarged view of a main part of FIG. 1;

FIG. 3 is a sectional view taken along line BB of FIG. 2;

FIG. 4 is a diagram illustrating the operation of the present invention.

FIG. 5 is a cross-sectional view of a conventional main part.

FIG. 6 is an enlarged view of a portion A in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower die 2 Upper die member 3 Main core 4 Slide core 5 Cylinder 9 Slot 10 Shaft 11 Notch recess for bending end forming 12 Cam block 13 Upper slide 14 Tapered surface 15 Guide post 16 Engagement hole W Molded product E Bending Terminal

Claims (1)

(57) [Scope of request for utility model registration] 1. A resin injection molding die for molding a synthetic resin molded article having a bent end, comprising: a lower die; an upper die member which moves up and down with respect to the lower die; A main core which is supported so as to be relatively movable in a direction and forms a gap corresponding to the thickness of a molded product between the lower mold and the notch concave portion for forming the bent terminal which communicates with the gap on the upper surface, and the upper mold member And a guide post protruding with the axis directed in the direction of movement of the upper die member. A moving slide core, a cam block fixed to the upper die member and having a tapered surface inclined downward in the forward direction of the slide core, and guided and supported by the cam block so as to be movable in parallel with the slide core. The guide A synthetic resin injection mold including a slide upper die having a mating hole of a post and a tapered surface that is in contact with a tapered surface of the cam block, in planar contact with an upper surface of the slide core, and in contact with a side surface of the lower die.