JP2533967Y2 - Vertical molding equipment for resin molded products - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION INDUSTRIAL APPLICABILITY The present invention relates to a resin molded product, in particular, a resin molded product having a rib protruding in a band shape on the back surface of a molded product main body and having a hole in an intermediate portion of the rib. It relates to a molding device.

2. Description of the Related Art FIG. 9 is a perspective view showing a side portion of a synthetic resin bumper used for an automobile, which has a band-shaped rib B formed on the back surface of a bumper body A as a molded article body. Holes C such as a bumper stay mounting hole, a license plate lamp mounting hole, and a grill mounting hole are formed in an intermediate portion of the rib B.

FIGS. 5 to 8 show a vertical molding apparatus used for molding such a resin molded article. In these figures, reference numeral 1 denotes an upper molding die, on which a rib forming groove 2 and a nest receiving hole 3 are formed in a molded product main body forming wall surface 1a. The nest receiving hole 3 communicates with a part of one wall surface which constitutes a wall surface facing each other in the longitudinal direction of the rib forming groove 2. Reference numeral 4 denotes a nest, which is housed in the nest receiving hole 3. The rib forming groove side wall surface of the insert 4 is substantially flush with one wall surface of the rib forming groove 2 and is exposed to the rib forming groove 2. A hole forming projection 5 is formed on the rib forming groove side wall surface of the insert 4. Reference numeral 6 denotes an ejector member, which is formed from a guide hole 7 formed in a portion of the molding die 1 opposite to the nest 4 of the rib forming groove 2 on the side opposite to the nest 4 so as to form a molded product main body forming wall of the upper molding die 1. By protruding to 1a, the bumper main body A protrudes. Reference numeral 8 denotes an ejector driving mechanism, which includes an ejector plate 9. The ejector plate 9 is arranged above the upper mold 1 and is driven to move up and down by a driving source (not shown). The upper end of the ejector member 6 is fixed to the ejector plate 9, and a connecting rod 10 is assembled to be vertically movable. The connecting rod 10 includes an intermediate shaft portion 10a vertically penetrating through a through hole 11 formed in the ejector plate 9, a small-diameter distal shaft portion 10b coaxially projecting downward from the intermediate shaft portion 10a, and an intermediate shaft portion 10b. The head 10c includes a large-diameter head 10c protruding from the upper end of the shaft 10a, and a pin 10d coaxially protruding upward from the head 10c. This connecting rod 10
The tip shaft portion 10b is inserted into a guide hole 12 formed in the upper mold 1 and is different from the above-described one, and the lower end of the tip shaft portion 10b is connected to the nest 4. A spring case 13 is attached around the connecting rod arrangement portion on the ejector plate 9. A spring 14 for urging the connecting rod 10 downward is inserted between the inner surface of the upper wall of the spring case 13 and the head 10c of the connecting rod 10. An escape hole 15 for the pin portion 10d is formed in the upper wall of the spring case 13. A stopper hole 16 is formed above the guide hole 12 of the upper mold 1.

Here, in order to mold a molded article, first, the upper mold 1
By forming a product space portion (not shown) by clamping with a lower molding die (not shown), a molding material of a synthetic resin is injected into the product space portion and solidified to form a rib B having a hole C formed therein. The bumper main body A including the above is molded.

Next, the upper mold 1 is driven to move up together with the ejector drive mechanism 8 to stop at the position of the upper limit as shown in FIG. At this time, since the hole forming projections 5 are fitted into the holes C of the ribs B, the bumper main body A rises together with the upper molding die 1 while releasing from the lower molding die.

Thereafter, as shown in FIG. 7, the ejector plate 9 of the ejector drive mechanism 8 is driven downward while the upper mold 1 is stopped at the upper limit position, so that the nest 4 and the ejector member 6 are lowered together. Protruding towards
The rib B and the bumper body A are released from the upper mold 1,
At the position where the rib B is pulled out from the rib forming groove 2, the lower end of the intermediate shaft portion 10 a of the connecting rod 10 contacts the bottom surface of the stopper hole 16.

Subsequently, as shown in FIG. 8, the ejector plate 9 is driven to the lower limit position while the upper mold 1 is stopped at the upper limit position. Then, the spring 14 is compressed while the connecting rod 10 is in contact with the stopper hole 16, the nest 4 remains stopped, and the ejector member 6
The rib B is bent more in the direction away from the insert 4. Due to the deflection of the rib B, the engagement between the hole C and the hole forming projection 5 is released. Then, the bumper body A including the rib B having the hole C is dropped by its own weight onto a take-out mechanism (not shown) and taken out of the molding apparatus. At the same time, the ejector plate 9 of the ejector driving mechanism 8 is driven to rise from the lower limit position in FIG. 8 and stopped at the upper limit position shown in FIG. As a result, the insert 4 and the ejector member 6 are returned, and one cycle of the molding operation is completed.

Problems to be Solved by the Invention In the above-described vertical molding apparatus, when removing the resin molded product, the ejector plate 9 moves from the upper limit position shown in FIG. 5 to the lower limit position shown by the solid line in FIG. On the way, between the time when the connecting rod 10 comes into contact with the stopper hole 16 and the time when the ejector plate 9 stops at the lower limit position, the ejector member 6 projects more than the nest 4. Stroke difference L
(See FIG. 8), the rib B is deflected in a direction away from the nest 4 to release the engagement between the hole C and the hole forming projection 5, and the bumper main body A is dropped by its own weight onto the take-out mechanism. It has a structure. In addition, the ejector member 6 is separated from the insert 4 so as not to interfere with the rib B which is deformed and deformed. Because of this, the downward pressure of the ejector member 6 causes the entire belt-shaped rib B to bend in a direction away from the nest as shown in FIG. Is slightly different for each molding cycle, and the timing at which the hole C comes out of the hole forming protrusion 5, that is, the timing at which the bumper body A starts to fall under its own weight is slightly different for each molding cycle, and the bumper which falls on its take-out mechanism by its own weight There is an inconvenience that the balance of the main body A is lost, and the posture of taking out the bumper main body A out of the molding apparatus is unstable.

Means for Solving the Problems Therefore, in the present invention, the ejector member is positioned on the opposite side of the nest receiving hole of the rib forming groove of the upper mold, on both sides of the nest receiving hole, and away from the rib nest. It is arranged at a portion separated by a dimension smaller than the amount of deflection of the deflection.

When releasing a resin molded product from the upper mold,
Due to the protrusion stroke larger than the nesting of the ejector member by the ejector drive mechanism, the area around the hole arrangement portion of the rib bends in both the protruding direction and the direction intersecting the same, and the nest and the ejector members located on both sides of the nest. Will be retained. Then, the hole is completely removed from the hole-forming convex portion, and both deflections generated in the rib are restored by the elastic force of the rib itself. The resin molded article main body falls by its own weight toward the takeout mechanism while falling out from between the ejector member.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the drawings, in which the same reference numerals are given to the same parts as those of the conventional structure.

 First, the structure of the embodiment will be described.

In this embodiment, as shown in FIGS. 1 and 2, a rib forming groove 2 and a nest receiving hole 3 are formed on a molded product body forming wall surface 1a of an upper molding die 1. In the nest receiving hole 3, a nest 4 in which a hole forming projection 5 is formed is housed. A guide hole of the upper mold 1 is provided at an upper end of the nest 4.
The lower end of the distal end shaft portion 10b of the connecting rod 10 into which the 12 has been inserted is connected. This connecting rod 10 is the head of the connecting rod 10.
It is urged downward by a spring 4 inserted between 10c and the inner surface of the upper wall of a spring case 13 mounted on the ejector plate 9. The intermediate shaft portion 10a of the connecting rod 10 comes into contact with the bottom surface of the stopper hole 16 formed in the upper mold 1 while the ejector plate 9 is descending from the upper limit position to the lower limit position. .

Here, a plurality of ejector members 20 and 21 located on both sides of the insert 4 are mounted on the upper mold 1. Specifically, these ejector members 20 and 21 are connected to the upper mold 1.
On the side opposite to the nesting receiving hole 3 of the rib forming groove 2 of
The ribs B are housed in guide holes 22 and 23 formed on both sides of the nest receiving hole 3 and at a portion separated by a dimension smaller than the amount of change H of the deflection of the rib B in the direction away from the nest 4. The lower ends of the rods 24, 25 are individually connected to the upper ends of the ejector members 20, 21, respectively. These rods 24 and 25 are inserted into guide holes 26 and 27 which are formed in the upper mold 1 and are different from those described above. The upper ends of the rods 24 and 25 are fixed to the ejector plate 9.

 Next, the operation of the embodiment will be described.

First, a product space (not shown) is formed by clamping the upper mold 1 with a lower mold (not shown), and a molding material of a synthetic resin is injected into the product space and solidified to form a hole C. The bumper main body A including the formed rib B is formed.

Next, the upper mold 1 is driven to move up together with the ejector drive mechanism 8 to stop at the position of the upper limit as shown in FIG. At this time, since the hole forming projections 5 are fitted into the holes C of the ribs B, the bumper main body A rises together with the upper molding die 1 while releasing from the lower molding die.

Thereafter, as shown in FIG. 3, the ejector plate 9 of the ejector drive mechanism 8 is driven downward while the upper mold 1 is stopped at the ascending limit position, so that the insert 4 and the ejector members 20 and 21 come together. At a position where the rib B and the bumper main body A are released from the upper mold 1 and the rib B is pulled out from the rib forming groove 2.
The lower end of the intermediate shaft portion 10a of the connecting rod 10 contacts the bottom surface of the stopper hole 16.

Subsequently, as shown in FIG. 4, the ejector plate 9 is driven to the lower limit position while the upper mold 1 is stopped at the upper limit position. Then, while the connecting rod 10 is in contact with the stopper hole 16 and compresses the spring 14, the nest 4 remains stopped, and the ejector members 20, 21 are protruded more than the nest 4 by the stroke difference L from the nest 4. , The rib B bends away from the nest 4. Due to the deflection of the rib B, the engagement between the hole C and the hole forming projection 5 is released. At this time, the area around the hole arrangement portion of the rib B is held by the nest 4 and the ejector members 20 and 21 while being bent in a direction intersecting with the bending, as indicated by a virtual line in FIG. You. Then, the hole C is completely removed from the hole forming convex portion 5, and both the bendings generated on the rib B are restored by the elastic force of the rib B itself. The bumper main body A including the rib B having the hole C is dropped by its own weight onto a take-out mechanism (not shown) while being removed from between the nest and the ejector members 20 and 21 by its own weight, and taken out of the molding apparatus.
At the same time, the ejector plate 9 of the ejector drive mechanism 8 is driven up and down from the lower limit position shown in FIG. 4 to stop at the upper limit position shown in FIG. As a result, the insert 4 and the ejector members 20 and 21 are returned, and one cycle of the molding operation is completed.

The present invention can be applied to a vertical molding device for a synthetic resin molded product other than a bumper.

According to the present invention as described above, according to the present invention, when the resin molded product is released from the upper molding die, the ejector drive mechanism has a protrusion stroke larger than the nesting of the ejector member, so that the periphery of the hole arrangement portion of the rib is Since it is held by the nest and the ejector members located on both sides of the nest while bending in both the protruding direction and the direction intersecting with it, the reaction force generated by the deflection of the ribs is slightly different for each molding cycle. Can be eliminated. In addition, since the holes are completely removed from the hole forming projections and both the deflections generated in the ribs are restored by the elastic force of the ribs themselves, the area around the hole arrangement portions of the ribs is nested due to the weight of the resin molded body. Since it comes out from between the ejector member, it is possible to solve the problem that the timing at which the molded article main body starts to fall under its own weight is slightly different for each molding cycle. Therefore, the balance of the molded article body that falls by its own weight is stabilized, and the posture of taking out the molded article outside the molding apparatus is stabilized.

[Brief description of the drawings]

FIG. 1 is a bottom view showing an upper mold according to an embodiment of the present invention;
FIG. 2 is a longitudinal sectional view showing a state in which the ejector plate of the embodiment is stopped at the ascending limit position, FIG. 3 is a longitudinal sectional view showing a state in which the connecting rod of the embodiment is in contact with a stopper hole,
FIG. 4 is a longitudinal sectional view showing a state in which the ejector plate of the embodiment is stopped at the lower limit position, and FIG. 5 is a longitudinal sectional view showing a state in which the ejector plate of the conventional vertical molding apparatus is stopped at the upper limit position. 6, FIG. 6 is a bottom view showing the upper molding die of the conventional example, FIG. 7 is a longitudinal sectional view showing a state in which the connecting rod of the embodiment is in contact with a stopper hole, and FIG. 8 is an ejector of the conventional example. FIG. 9 is a longitudinal sectional view showing a state in which the plate has stopped at the lower limit position, and FIG. 9 is a perspective view showing a side of the bumper. 1 ... upper mold, 1a ... wall surface on which molded product body is formed, 2 ...
Groove for forming rib, 3 ... Nest receiving hole, 4 ... Nest, 5
...... Hole forming projections, 8 ... Ejector drive mechanism, 20, 21
... Ejector member, A... Bumper body (molded product body), B... Rib, C... Hole, H.

Claims (1)

(57) [Scope of request for utility model registration] A groove for forming a rib and a nest receiving hole communicating with one side wall of the groove for forming a rib are formed on a wall surface of a molded article body of the upper mold, and a convex for forming a hole is formed in the nest receiving hole. The ejector member of the molded article main body is mounted on the upper molding die while the nest formed with the portion is housed, and the ejector member and the nest are protruded from the upper molding die by an ejector driving mechanism to form a molded article including ribs. The main body is released from the upper mold, and the rib is formed in the rib by projecting the ejector member more than the nest at the position where the rib is extracted from the groove for forming the rib and bending the rib in the direction away from the nest. In the vertical molding apparatus for a resin molded product in which the engagement between the hole and the projection for forming a hole is released, the ejector member is located on the opposite side of the nest receiving hole of the groove for forming a rib of the upper molding die. Nested receiving hole both sides a and rib of the vertical molding apparatus deflection of the resin molded article characterized by being arranged in a small size portion distant than the displacement amount in the direction away from the nesting.