JPH0246138B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a runner exchange device for a multi-cavity mold, and more particularly, a runner exchange device for a multi-cavity mold that allows inserts to be exchanged. can be used to replace the
The present invention relates to a runner exchange device for a multi-cavity mold, which allows the resin flow path from a nozzle to be easily changed depending on the insert.

Conventionally, the resin inlet of the insert to be replaced was opened at a different position on the nozzle facing surface of the insert, or was formed on the side wall surface of the insert as a runner carved into the parting surface. In cases where the insert is inserted and fixed, the mold body into which the insert is inserted and fixed is replaced, in order to reduce the time required to replace the insert.
There is a problem in that the purpose of adapting to high-mix, low-volume production, which has been desired in recent years, cannot be achieved.

The present invention has been made in view of the above problems, and its purpose is to easily connect the resin flow path to the insert even when replacing the insert with a different resin inlet position. To provide a runner exchange device for a multi-cavity molding die, which can be changed over, facilitates the exchange of inserts, and can be adapted to high-mix, low-volume production.

The feature is that the injection nozzle of the molding machine communicates with each resin inlet of the insert, which is replaceably arranged in each of the plurality of insert insertion recesses provided in the mold body, and that the injection nozzle of the molding machine is connected to the mold. A runner exchange device comprising a runner plate in which a runner is carved to guide the molten resin that is injected when the nozzle contacts the mold, and the runner plate is slidable in a direction perpendicular to the direction in which the nozzle contacts the mold. Then, the runner plate has
A plurality of sets of runners are carved at predetermined intervals in the sliding direction of the runner plate so as to correspond to the position of the resin inlet of each insert to be replaced.

Hereinafter, preferred embodiments of the present invention will be described in detail based on the accompanying drawings.

In Fig. 1 showing the parting surface of one mold which is a split mold (the other mold is constructed in the same way), 1 is a mold body, and this mold body 1 includes Four nest insertion recesses 2 are formed leaving a cross-shaped partition wall 1a at the center of the parting surface. The two perpendicular surfaces of the partition wall 1a serve as regulating surfaces 2a of each nest insertion recess 2.

Reference numeral 3 denotes four nests inserted into each of the nest insertion recesses 2, and the outer shapes are the same. That is, the shape of the parting surface of the insert 3 is approximately square, and the corner opposite to the corner 3b formed by the contact surface 3a that contacts the regulation surface 2a is cut off to form a pressing surface 3c facing the corner 3b. It is formed. Note that this pressing surface 3c is a slightly inclined surface toward the bottom surface of the insert inserting recess 2 in order to prevent the insert 3 from floating up.

Reference numeral 4 denotes a fixture for positioning and fixing each insert 3 in the insert inserting recess 2 by having its tip surface abut against the pressing surface 3c, and is guided inside the mold body 1 and is movable in the left and right directions in FIG. It is becoming.

Reference numeral 5 denotes a cylinder that moves two fixtures 4 located vertically in FIG. 1 toward and away from the insert 3 at the same time.
It is placed perpendicular to the direction of advance and retreat. A rotatable arm 7 and an arm 8 extending in the opposite direction of the arm 7 are attached to a shaft 6 attached to the cylinder rod 5a and cylinder case 5b of the cylinder 5, respectively. 4 through a shaft 9, and the arm 8
A shaft 10 provided at the tip of the mold body 1 is guided by a groove provided in the mold body 1 and moves back and forth in the same direction as the moving direction of the fixture 4.

Reference numeral 11 denotes a stop pin that restricts the forward movement of the arm 8, and its tip is connected to the shaft 1 in the forward position of the arm 8.
0, and the base end is pressed by a disc spring 11a.

The cylinder 5 on the right side in FIG.
After that, insert the cylinder 5 on the left side in Figure 1.
When driven to the extension side as shown, the fixture 4 presses the pressing surface 3c of the insert 3, the contact surface 3a of the insert 3 is pressed against the regulating surface 2a, and each insert 3 is positioned and fixed. .

Since each insert 3 has the same shape, it can be placed in any insert insertion recess 2 with compatibility, and when the cylinder 5 is driven to the extension side, the shaft 6 Since the axes of 9 and 10 coincide on the same line, the reaction force from the insert 3 is applied to the cylinder 5.
Since it does not act directly on the disc spring 11a, but only acts on the disc spring 11a, the fixation of the insert 3 is stable.

Next, a runner structure suitable for use in a molding die in which the compatible insert 3 is positioned by the cross-shaped partition wall 1a as described above will be explained.As shown in FIG. A sprue 12 is formed at the center of the partition wall 1a of the nozzle side mold body 1 of the mold which is divided into two parts, and the partition wall 1a of the other mold body 1 has a sprue 12 on its parting surface. Runners 13 are carved that extend from the center in the left-right direction in FIG. .

The runner 1 is placed on the parting surface of each nest 3.
A cavity (not shown) is located corresponding to the tip of 3.
A runner 14 that extends from the top to one contact surface 3a, and a runner 15 that opens to the other contact surface 3a and is located at the same distance from the corner 3b formed by the two contact surfaces 3a.
is carved, and the runners 14 and 15 are in communication.

Therefore, each insert 3 is inserted into any insert insertion recess 2.
Even if it is inserted into the runner 14 or 15 of nest 3,
Either one of them will necessarily communicate with the runner 13 of the mold body 1, making it easy to replace the insert 3.

Next, we will explain a runner exchange device that uses a plurality of inserts 3 and is suitable for use in the aforementioned high-mix, low-volume production by exchanging them.The gate position differs depending on the molded product. In addition to those in which runners are provided on the parting surface as shown in FIG. 1, there are also those in which a gate is formed on the bottom surface of the cavity of the insert.

Therefore, if the mold body is replaced every time inserts with different gate positions are replaced, the purpose of adapting to high-mix, low-volume production by replacing only the inserts cannot be achieved.

Therefore, the runner plate 16 is connected to the nozzle bush 17 and the insert 3 as shown in FIGS. 2 and 3.
The mold body 1 is positioned between the mold body 1 and the nozzle side surface of the mold body 1, and is slidably arranged in a direction parallel to the parting surface.

Then, on the nozzle side of the runner plate 16,
Various flow paths for molten resin are formed at predetermined intervals in the sliding direction of the runner plate 16.

That is, in FIG. 3, 18 is a runner formed in an X-shape, into the center of which molten resin is supplied from a nozzle, and from a through hole 18a bored at each tip to the bottom surface of each insert 3. leak.

Reference numeral 19 denotes a through hole bored at a predetermined interval from the center of the runner 18 in the sliding direction of the runner plate 16, and when the runner plate 16 slides and the through hole 19 comes to a position facing the nozzle. It communicates with the sprue 12 formed in the partition wall 1a of the mold body 1 shown in FIG.

Reference numeral 20 denotes a runner formed in an H shape, the center of which is formed in the sliding direction of the runner plate 16 from the through hole 19 with the same distance as the center of the runner 18 and the center of the through hole 19. There is. The molten resin supplied from the nozzle to the center of the runner 20 flows out to the bottom surface of each insert 3 from through holes 20a formed at each tip of the runner 20.

Reference numeral 21 denotes a through hole for fixing the runner plate 16 at a position where the centers of the runner 18, the through hole 19, and the runner 20 coincide with the nozzle center, and the runner 18,
The through holes 19 and the runners 20 are formed at the same distance from each other, and the positioning pins 22 are inserted therein.

Reference numeral 23 denotes a cylinder that slides and drives the runner plate 16, and the stroke of this cylinder 23 is approximately the same as the distance between the center of the runner 18 and the center of the through hole 19. Therefore, the runner plate 16 can only be slid by one pitch in one reciprocating movement of the cylinder 23.
A progressive mechanism is provided that sequentially slides the runner plate 16 by reciprocating the runner plate.

This sequential feeding mechanism is carried out by the rod 23 of the cylinder 23.
It is rotatably attached to the tip of the rod 23a and biased toward the side of the rod 23a, and the tip shape is
A locking pawl 24 formed in a 90 degree wedge shape,
A groove 25 is formed in the runner plate 16 at a position corresponding to the rod 23a and guides the rod 23a, and a center pitch between the runner 18 and the through hole 19 is formed on the surface of the groove 25 facing the locking pawl 24. A plurality of engaging protrusions 26 that protrude at the same pitch and that the tips of the locking claws 24 engage with when the rod 23a moves forward or backward, and both outer sides of the engaging protrusions 26 at both ends of the engaging protrusions 26. The groove 25 has two widened portions 25a and 25b formed in the groove 25 to switch the direction of the locking pawl 24.

Therefore, the runner 18 of the runner plate 16 in the position shown in FIG. 3 is no longer in use, and when the insert 3 is replaced and the runner 20 is used, the cylinder 23 only needs to be driven back and forth twice. When using the through hole 19, the cylinder 23 is reciprocated once to move the locking pawl 24 to the widened portion 25a, and the direction of the locking pawl 24 is changed and the cylinder 23
It is only necessary to reciprocate once, and the molten resin flow path can be selected according to the insert 3 to be replaced.

In the above-mentioned embodiment, the respective inserts 3 are arranged so that their pressing surfaces 3c form a V-shape, but the invention is not limited to this. For example, the pressing surfaces 3c of adjacent inserts 3 may be arranged in a V-shape. The insert 3 may be fixed with a fixture having a V-shaped tip.

Furthermore, the nest in the above embodiments may be round instead of square.

In this way, according to the present invention, when replacing inserts with different resin inlet positions, it is possible to easily switch the resin flow path to the insert, making it easy to replace inserts, and producing a wide variety of small quantities. It is effective in that it can be adapted to production.

Although the present invention has been variously explained above with reference to preferred embodiments, the present invention is not limited to these embodiments, and it goes without saying that many modifications can be made without departing from the spirit of the invention. It is.

[Brief explanation of the drawing]

The drawings show a preferred embodiment of the present invention; Fig. 1 is a plan view showing one parting surface of a split mold; and Fig. 2 is a cross-sectional view taken along line AA in Fig. 1. , FIG. 3 is a sectional view taken along line BB in FIG. 2. DESCRIPTION OF SYMBOLS 1... Mold body, 1a... Partition wall, 2... Insert insertion recess, 2a... Regulation surface, 3... Insert, 3a...
...Abutting surface, 3b... Corner, 3c... Pressing surface, 4...
...Fixing tool, 5...Cylinder, 5a...Cylinder rod, 5b...Cylinder case, 6...Shaft, 7,
8... Arm, 9, 10... Axis, 11... Stop pin, 11a... Belleville spring, 12... Sprue, 1
3, 14, 15...Runner, 16...Runner plate, 17...Nozzle bush, 18...Runner, 18a...Through hole, 19...Through hole, 20...Runner, 20a...Through hole, 21... ...Through hole, 22...
Positioning pin, 23... Cylinder, 23a... Rod, 24... Locking claw, 25... Groove, 25a, 2
5b... Widening portion, 26... Engaging protrusion.

Claims (1)

[Scope of Claims] 1. The mold body is connected to each resin inlet of the insert which is replaceably arranged in each of the plurality of insert insertion recesses provided in the mold body, and the injection nozzle of the molding machine is connected to the mold body. A runner replacement comprising a runner plate in which a runner is carved to guide the molten resin injected by contacting the mold, and is slidable in a direction perpendicular to the direction in which the nozzle contacts the mold. In the apparatus, a plurality of sets of runners are carved on the runner plate at predetermined intervals in a sliding direction of the runner plate in accordance with the position of the resin inlet of each insert to be replaced. A runner changing device for a multi-cavity molding die.