JPS603948A - Device for blowing parting material to core - Google Patents

Abstract

PURPOSE:To spray effectively a parting material to a desired position by providing a liquid passage communicating with the groove of a spray nozzle pin when the spray nozzle pin projects to a core side to a matrix and a movable liner. CONSTITUTION:When a core 13 ascends after mold opening upon completion of molding, an ejector plate 6 for ejecting the molding is pushed leftward and a spray nozzle pin 5 is progressed leftward as well. The notch of the pin 5 projects from the core mating surface 2a of a movable liner and communicates at the same time with a liquid passage 12. When a parting material is supplied from the part of an L-shaped pipe 8 to a pipe 9, the parting material enters a notch by flowing through the pipes 8, 9 and the passages 10, 12 and is sprayed from the tip of the notch toward the required part of the asended core 13 at an angle alpha. The parting is thus surely accomplished.

Description

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

(Conventional technique? (ii) In die-casting molds, fixed inserts, [
The movable insert is supported, and a core is provided between the fixed insert and the i1J movable insert to perform molding. 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 the mold release resistance when removing the core from the product, 8! ! Before tightening, apply mold release agent to the fixed insert, movable insert, and core (parting side) from the parting side.
Then, spray a mold release agent on the back side of the core (the side opposite to the cutting edge) to ensure smooth mold release.

By the way, the conventional spray nozzle for spraying mold release agent onto the back side (opposite the parting surface) of the core of a die-casting mold was located quite high on the movable insert, so it was far from the spray target position on the core. , there was a problem with not being able to aim accurately. Furthermore, since casting burrs are generated from the mating surfaces of the cores, there is also the problem that the nozzles are clogged with burrs. 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.

(Objective of the Invention) The present invention has been accomplished in order to determine these 1+'J Mu by 1ljY.

(1F Construction of the Invention) In order to achieve the above object, the present invention provides a die-casting mold equipped with a mother mold and an extrusion bottle through which an Ij moving insert supported inside the mother mold is passed through Pj. In addition to passing through the mother mold and the spray nozzle bin which advances and retreats at the same time as the 011 extrusion bottle in the mother mold, a T with the tip 1111 directed toward the inner core of the Loe movable insert is attached to a part of the spray nozzle bin.
1"4, while on the mother mold and Loe movable insert,
A liquid passage is provided which communicates with the groove marked tj1 of the spray nozzle bin when the spray nozzle bin protrudes toward the core.

(Implementation Liu) An embodiment of the present invention will be described with reference to FIG. 1. 1 is a matrix, 2 is supported inside this matrix 1, and 7'
J motion nest. Holes 3 and 4 are provided in the matrix 1 and the 10-movable insert 2 in alignment, and a spray nozzle bin 5 is slidably mounted on the paper base. 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 bin 5. Although not shown, the matrix 1 and the movable insert 2
is provided with a plurality of holes parallel to the holes 5 and 4, and an extrusion bottle is extended low parallel to the spray nozzle bin 5, and its outer end is connected to the extrusion plate 6.

The spray nozzle bin 5 is provided with a cutout 5a at -171; as shown in FIG.

The shape of the tip of this notch 5 a B has an angle α with respect to the longitudinal direction of the spray nozzle bin 5 (see Fig. 5). A hole l is provided above the spray nozzle bin 5 of the 1v type 1.
t″1″・,=o−1L′ 31・Tat end 1
14 Ri 1 A knob 9 to which a pipe (elbow) 8 is connected is inserted. 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 opened toward the hole 4 and the other end connected to an intermediate portion of a liquid path 12 which is closed with a plug 11.

Next, the operation of this FILJ device will be explained. In FIGS. 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. It performs molding. In this raised state where the core 15 has come out of the molded object (the state shown in FIG. 3), the mold release agent is sprayed onto the back side of the core 13 (the opposite side surface tit!I).

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 extrusion plate 6, which had been in the position shown in FIG. will be pushed out. At this time, the spray nozzle bin 5 whose outer end is fixed to the extrusion plate 6 in the same way as the extrusion bottle also moves to the left in the figure.

The spray nozzle bin 5 has a J notch 5a as described above.
is provided, so when the spray nozzle bin 5 moves to the left, one end (tip side) of this notch 5 protrudes from the core mating surface 2a of the movable insert 2 and simultaneously enters the liquid path 12.
I will pass through JA. At this time, when a mold release agent is supplied from the L-shaped pipe 8 to the pipe 9, the mold release agent passes through the L-shaped pipe 8, the pipe 9, and the liquid passages 10, 12, and enters the notch 5.
a, and is injected from the tip of this notch 5a toward the required location of the core 15, which has risen at an angle α. With this, Pii! , the molding will be done reliably.

The time for spraying the mold release agent is controlled by setting the opening time of the tii valve (not shown) using a timer. As time passes, the injection of the mold release agent is stopped and compressed air flows through the sulfur passage to drive out the mold release agent remaining in the flow passage. After that, the spray nozzle pin 5 moves to the right in the figure together with the push-out plate 6, and the first
Return to the state shown in the figure. In this state, the notch 5a of the spray nozzle bin 5 comes out of the flow path 12.

Thereafter, the core 15 is lowered and the mold is clamped.

(Effect of the invention) Since the present invention is configured as explained above,
It is possible to aim the mold release agent on the back side of the core (on the side facing away from the parting surface) from a relatively close distance, at a position where seizure or galling is likely to occur. Effect (lI
This has the effect of making the most of the reduction in jIE type resistance, cooling effect, etc.).

In addition, there is no nozzle clogging due to cast burrs blowing out from the mating surface of the core, and there is no liquid leakage that occurs when the nozzle is installed on the upper core, thus preventing defects caused by wrinkles. This becomes rzJ Noh. Furthermore, by changing the angle α and clearance of the notch provided in the spray nozzle bin, as well as the shape and size of the notch, 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 cross-sectional view of an embodiment of the present invention, FIG. 2 is a cross-sectional view of a spray nozzle bin cut along line 1 in FIG. 1, and FIG. FIG. 3 is a vertical cross-sectional view showing the operating state of the device. 1...Material mold 2...Movable insert 5.4.7...Hole 5.°.Spray 7 Zulpi/6.
...Extrusion plate 9...Pipe 10.12...Liquid path (1 other person)

Claims (1)

[Claims] (1) In 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 groove is formed in a part of the spray nozzle pin that passes through the mother mold and a spray nozzle pin that moves forward and backward at the same time as the extrusion pin in the mother mold, and whose tip is directed toward the core inside the movable insert; 1 to the core, characterized in that the mother die and the iJ movable insert are provided with a liquid passage that communicates with the T;'t of the spray nozzle bin when the spray nozzle pin protrudes toward the core. A device is used to spray the mold agent.