JPS6026974Y2 - Synthetic resin mold - Google Patents

Description

[Detailed description of the invention] The invention relates to a synthetic leather resin mold, and in particular,
This mold is suitable as a mold for molding a molded product such as an automobile bumper that requires an undercut mold at both longitudinal ends bent portions using urethane polymer or the like.

As shown in FIGS. 1 and 2, the automobile bumper a has undercuts at both ends in the longitudinal direction. A lower mold sliding type is provided with a slide core i that slides on a sliding surface along a guide part g as shown by an arrow f between a lower mold d and an upper mold e supported by C. Although there are known types, it is difficult to adjust the sliding type as shown in Figure 3.

This means that during adjustment, a lot of man-hours are required to complete the adjustment, as the material must be disassembled and removed each time since it is contaminated with dust.

Even after the molding process is complete, if any particles are present, it is necessary to disassemble the mold and remove them. If left as is, the molded product will have a step and galling will occur in the mold.

Furthermore, as shown in Fig. 4, a push-cut type with an upper mold e is known in which a guide pin j is fixed to a slide core i and a coil spring k is interposed between the slide core i and the lower mold d. However, in the method shown in FIG. 4, it is easy to remove the burr, but burr tends to get in there, and the burr must be removed from the molded product and from the mold frequently.

The purpose of this invention is to provide a sliding and rotating mechanism for the slide core used to treat undercuts as described above, to make it difficult for debris to enter the core, and to make it easier to remove debris if it does get in. One embodiment of this will be described with reference to FIGS. 5 to 7.

Fig. 5 shows the slide core actuating plate described below when it is at the forward limit, Fig. 6 shows it when it is in the intermediate position, and Fig. 7 is an elevational view showing when it is at the backward limit. It is.

In the figure, 1 is a mold, 2 is a lower mold, and 3 is an upper mold.

Reference numeral 4 denotes a slide core, which is positioned above the lower mold 2 and is slidable in the lateral direction (horizontal direction in the figure) so that it can approach and separate from the sides of the upper mold 3. An undercut portion is formed between the upper die 3 and the upper die 3.

Reference numeral 5 denotes a slide core actuation plate that moves laterally (in the left-right direction in the figure) from the intermediate position shown in Fig. 6 to the forward movement limit shown in Fig. 5, and from the intermediate position to the reverse movement limit shown in Fig. 7. It is installed so that it can slide and reciprocate on the formwork 1.

A guide plate 6 is fixed to the formwork 1 and has a horizontal guide groove 7 and a diagonal guide groove 8 following it.

9 is a connecting pin with a horizontal axis (in the figure, the axis is perpendicular to the plane of the paper),
The slide core 4 is rotatable with respect to the slide core actuating plate 5, and these two parts 5 and 4 are pivotally connected.

Reference numeral 10 denotes a guide pin, which is fixed to the slide core 4 and has a loose insertion hole so that it can move within the guide grooves 7 and 8 of the guide plate 6.

Reference numeral 11 denotes a slide core holder, which serves to push the slide core 4 toward the sliding surface 13 of the lower mold 2 by coming into contact with the mating surface 12 at the front upper part of the slide core 4 between the vicinity of the forward limit and the forward limit. do.

The horizontal guide groove 7 of the guide plate 6 faces closer to the upper die 3 and has a length corresponding to the moving distance from the intermediate position to the forward limit of the slide core operating plate 5, and also has a diagonal guide groove. 8 faces downward away from the upper mold 3, and the slide core operating plate 5 has a length corresponding to the moving distance from the intermediate position to the retraction limit and an inclination suitable for rotating the slide core 4. There is.

In the synthetic resin molding die configured as described above, when the slide core operating plate 5 is moved from the state shown in FIG. 6 to the state shown in FIG. The slide core 4 connected by the pin 9 also moves in that direction.

That is, the slide core 4 slides on the sliding surface 13 and approaches the upper mold 3.

At this time, the guide pin 10 guides the movement of the slide core 4 along the horizontal guide groove 7 of the guide plate 6.

At the forward limit in FIG. 5, the mating surface 12 of the slide core 4 comes into contact with the slide core holder 11 fixed to the lower mold 2, and the slide core 4 is strongly pressed against the lower mold 2, so that the sliding surface 13 Paris' progress to is prevented.

Next, when the slide core operating plate 5 is moved back from the state shown in FIG. 5 to the state shown in FIG. 6, the slide core 4 is also moved back.

Furthermore, the plate 5 is changed from the state shown in FIG. 6 to the state shown in FIG.
When the slide core 4 is moved backward, the guide pin 10 fixed to the slide core 4 may move backward, or the guide pin 10 fixed to the slide core 4 may move toward the oblique guide groove 8.
7, the slide core 4 rotates around the connecting pin 9 (rotating counterclockwise in FIG. 7) while retreating.

Therefore, even if a burr gets in due to die wear or the like, the burr can be removed without disassembling the slide core 4.

As described above, in the synthetic resin mold of the present invention, the slide core performs not only sliding movement but also rotational movement due to the lateral reciprocating movement of the slide core operating plate, and the slide core moves forward from near the forward limit of the sliding movement. At the limit, the slide core is strongly pressed against the lower die by the slide core holder, which prevents cracks from progressing to the sliding surface with the lower die, and the rotational movement of the slide core is performed from near the retraction limit to the retraction limit. Therefore, even if there is a burr, it can be removed without disassembling the slide core. Moreover, the position of the slide core's advance limit and the force with which it is pressed against the lower mold can be adjusted by using the slide core holder. The effects of the present invention are extremely large, as it can be easily performed by making fine adjustments.

[Brief explanation of drawings]

Figure 1 is a plan view of an automobile bumper, Figure 2 is its front view, Figure 3 is a partial explanatory diagram of the conventional lower mold sliding method, and Figure 4 is a part of the conventional upper mold push-cut method. An explanatory drawing, FIG. 5 is a partially cutaway elevational view showing the forward limit of an embodiment of the present invention, and FIG.
This figure is a partially cutaway elevational view showing the intermediate position, and FIG. 7 is a partially cutaway elevational view similarly showing the retraction limit. 1...Formwork, 2...Bottom mold, 3...
...Upper die, 4...Slide core, 5...
・Slide core operating plate, 6...Guide plate, 7...Horizontal guide groove, 8...Diagonal guide groove, 9...Connection pin, 10・・・・・・
Guide pin, 1 1...Slide core holder.

Claims (1)

[Scope of utility model registration request] a slide core positioned above the lower mold and slidable in the lateral direction so as to be able to move toward and away from the sides of the upper mold, and forming an undercut portion with the upper mold; It has a slide core actuating plate that can slide and reciprocate on the formwork in the lateral direction from the intermediate position to the forward limit and from the intermediate position to the backward limit, and a horizontal guide groove and a diagonal guide groove following this. A guide plate fixed to the formwork, a horizontal shaft-shaped connecting pin that pivotally connects the slide core operating plate so that the slide core can rotate with respect to the guide plate, and the guide plate fixed to the slide core. It consists of a guide pin that is loosely inserted into the guide groove of the plate, and a slide core holder that pushes the slide core toward the lower die between near the forward limit and the forward limit, and the horizontal guide groove of the guide plate is The diagonal guide groove faces toward the upper mold and has a length corresponding to the moving distance of the slide core operating plate from the intermediate position to the forward limit, and the diagonal guide groove faces downward away from the upper mold. A synthetic resin molding die having a length corresponding to the moving distance of the slide core operating plate from an intermediate position to a backward movement limit and an inclination suitable for rotating the slide core.