JPS6241827B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an apparatus for spraying a mold release agent onto a core in a die-casting mold.

(Prior art) In the case of a die-casting mold, a fixed insert and a movable insert are supported inside the mother mold, and a core is provided between the fixed insert and the movable insert to perform molding. Become. After molding, the core is lifted up and removed from the product, and the product is pushed out using an extrusion pin that passes through the mother mold and the movable insert. In this case, in order to reduce mold release resistance when pulling out the core from the product, apply the mold release agent to the fixed insert, movable insert, and core (on the parting surface side) from the parting surface side before mold clamping in the previous cycle. ), and also spray a mold release agent on the back side of the core (the side opposite to the cutout surface) to ensure smooth mold release.

By the way, the nozzle for spraying mold release agent onto the back side (opposite the parting surface) of the core of conventional die-casting molds was located at a fairly high position on the movable insert, so the spray nozzle was far from the target position of the core. There was a problem with not being able to aim accurately. There was also the problem that burrs were generated from the mating surfaces of the cores, causing them to clog the nozzle. Furthermore, with the core spray installed on the top side, there was a problem in that after the spraying was finished, the mold release agent remaining in the piping dripped into the cavity, causing dryness defects.

(Object of the Invention) The present invention has been made to solve these problems.

(Structure of the Invention) In order to achieve the above object, the present invention provides a die-casting mold provided with an extrusion pin that passes through a mother mold and a movable insert supported inside the mother mold. A spray nozzle pin is attached at the outer end of the extrusion plate to be attached in parallel with the extrusion pin so that the extrusion pin advances and retreats simultaneously with the mother die and the movable insert located inside the mother die, and the spray nozzle A groove is formed in a part of the pin with the tip facing the core inside the movable insert, while the spray nozzle pin protrudes toward the core side and the groove is movably inserted in the mother die and the movable insert. A liquid passage is provided which communicates with the groove when the liquid protrudes from the child toward the core.

(Embodiment) An embodiment of the present invention will be described with reference to FIG. 1. 1 is a matrix, and 2 is a movable insert supported inside the matrix 1. As shown in FIG. The mother die 1 and the movable insert 2 are provided with aligned holes 3 and 4 at appropriate intervals when viewed from above, and a spray nozzle pin 5.
are slidably fitted. An extrusion plate 6 consisting of a front plate 6a and a rear plate 6b is integrally attached to the outer end of the spray nozzle pin 5. Although not shown, the mother die 1 and the movable insert 2 are provided with a plurality of holes parallel to the holes 3 and 4, and extrusion pins 14 are inserted and inserted alternately in parallel with the spray nozzle pin 5, so that the outer ends It is connected to the extrusion plate 6 (see FIG. 4). As a result, the spray nozzle pin 5 is
At the same time, it moves forward and backward relative to the matrix 1 and the movable insert 2.

The spray nozzle pin 5 has a second
A notch-shaped groove 5a as shown in the figure is provided. The cutout groove 5a has a cross-sectional shape at the tip thereof at an angle α with respect to the longitudinal direction of the spray nozzle pin 5 (see FIG. 3). A hole 7 is provided in a portion of the mother die 1 above the spray nozzle pin 5, and a pipe 9 having an L-shaped pipe (elbow) 8 connected to the outer end thereof is fitted into the hole 7. The inner end of the pipe 9 is connected to a liquid path 10 provided in the movable insert 2. The liquid path 10 has its tip open toward the hole 4 and the other end connected to an intermediate portion of a liquid path 12 that is closed with a plug 11 . Liquid path 12
When the spray nozzle pin 5 protrudes toward the core 13 and the groove 5a protrudes from the movable insert 2 toward the core 13, it communicates with the groove 5a.

Next, the operation of this device configured as described above will be explained. 1 and 3, 13 is a core that moves up and down between the lowered state shown in FIG. 1 and the raised state shown in FIG. 3, and moves between the movable insert 2 and the molded object. This is what we do. This core 13
rising state where the material has come out of the molded object (state shown in Figure 3)
In this step, a mold release agent is sprayed onto the back side of the core 13 (the side opposite to the parting surface).

To explain step by step, first, after molding is completed and the mold is opened, the core 13 is raised. When the core 13 rises, in order to push out the molded product (not shown), the push-out plate 6, which had been in the position shown in FIG. It will be pushed out. At this time, like the push-out pin 14, the spray nozzle pin 5 whose outer end is fixed to the push-out plate 6 also moves to the left in the figure.

As described above, the spray nozzle pin 5 is provided with the notch groove 5a, so when the spray nozzle pin 5 moves to the left, one end (tip side) of the notch groove 5 will touch the movable insert 2. It protrudes from the core mating surface 2a and communicates with the liquid path 12 at the same time. At this time, from the L-shaped pipe 8 to the pipe 9
When a mold release agent is supplied, the mold release agent enters the notch groove 5a through the L-shaped pipe 8, pipe 9, and liquid channels 10, 12, and is released from the tip of the notch groove 5a at an angle α. This means that the spray is directed toward the required location on the elevated core 13. This ensures that the mold release agent is applied properly.

The spraying time of the mold release agent is controlled by setting the opening time of a solenoid valve (not shown) using a timer. When the spraying time has elapsed, the injection of the mold release agent is stopped, and the compressed air flows through the same sulfur passage to drive out the mold release agent remaining in the flow passage. Thereafter, the spray nozzle pin 5 moves to the right in the figure together with the push-out plate 6, returning to the state shown in FIG. In this state, the notch groove 5a of the spray nozzle pin 5 comes out of the flow path 12. Thereafter, the core 13 is lowered and the mold is clamped.

In the embodiment described above, the spray nozzle pin 5 and the push-out pin 14 were provided alternately in parallel when viewed from above.
This is just an example, and it goes without saying that the present invention can be applied to other positional relationships between the spray nozzle pin 5 and the push-out pin 14.

(Effects of the Invention) Since the present invention is configured as described above, the mold release agent can be sprayed at the position on the back side of the core (opposite the parting surface side), that is, the position where seizing and galling are likely to occur. Another advantage is that it is possible to aim from a relatively close distance, and the effects of the mold release agent (reduction of mold release resistance, cooling effect, etc.) can be utilized to the maximum.

In addition, there is no nozzle clogging due to cast burrs blowing out from the mating surface of the core, and there is no dripping that occurs when the nozzle is installed on the top core, thus preventing hot water wrinkle defects caused by this. becomes possible. Furthermore, by changing the angle α and clearance of the notch groove provided on the spray nozzle pin, as well as the shape and size of the notch groove, there is an advantage that the spraying range of the mold release agent can be adjusted.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of an embodiment of the present invention, Fig. 2 is a sectional view of the spray nozzle pin taken along the - line in Fig. 1, and Fig. 3 shows the operating state of the one in Fig. 1. The vertical sectional view, FIG. 4, is a plan view of FIG. 1. 1...Mother mold, 2...Movable insert, 3, 4, 7...
Hole, 5...Spray nozzle pin, 6...Extrusion plate, 9...Pipe, 10, 12...Liquid path, 14...
...Extrusion pin.

Claims (1)

[Claims] 1. In a die-casting mold provided with an extrusion pin that passes through a mother die and a movable insert supported inside the mother die, a spray nozzle pin is installed in parallel with the extrusion pin on an extrusion plate attached to the outer end of the extrusion pin. The extrusion pin is attached at the outer end so that it moves forward and backward at the same time as the mother mold and the movable insert located inside the mother mold, and the tip is attached to a part of the spray nozzle pin inside the movable insert. A groove is formed in the mother die and the movable insert when the spray nozzle pin protrudes toward the core and the groove protrudes from the movable insert toward the core. A device for spraying a mold release agent onto a core, characterized in that a communicating liquid passage is provided.