JPS5820669B2 - Rikeizaino Spray Hohou Oyobi Souchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a spray method and apparatus for supplying a spray of a mold release agent to the inner surface of a mold for die casting, forging, plastic molding, etc.

In conventional die-casting machines, in order to spray mold release agent onto the inside of the mold, the space between the fixed mold and the movable mold is opened, the product is taken out, and then a spray nozzle is inserted between the two molds from the outside. There is a way.

However, in this case, it is not possible to sufficiently supply the spray to the shaded areas such as the back side of the core, which tends to cause uneven adhesion, increases consumption of mold release agent, and is not only uneconomical but also has low workability. There were problems such as deterioration of the working environment.

Conventionally, a stand is attached to the frame of a die-casting machine, an atomizer is fixed to the tip of the stand, the nozzle at the tip of the atomizer is directed toward the inside of the mold, and after the mold is opened and the casting is removed, the mold is removed from the nozzle. A spraying method is also known, which provides a spray of mold release agent to the inner surface.

However, in this case as well, the spray nozzle tends to be located away from the mold mating surface, and uneven adhesion tends to occur in areas shaded by the core, etc., and the required number of atomizers increases, which tends to increase costs.

In the present invention, a nozzle insertion hole is provided in the movable mold in parallel or almost parallel to the ejection pin hole, and a cylindrical spray nozzle fitted into the hole is extruded in the same manner as the ejection pin when taking out the product, and the mold is aligned with the pin. By protruding from the surface, the mold release agent can be reliably sprayed to the required location from a position close to the inner surface of the mold.

Further, at least two nozzles in mutually different directions are provided at a distance from each other on the side wall of the cylindrical tip end of the spray nozzle incorporated in the movable mold, and a movable valve is fitted to the cylinder surface within the cylindrical portion. At the same time, by changing the position of the moving valve, the nozzle can be switched, making it possible to supply mold release agent to both molds using only the spray nozzle on the movable mold side.

The invention will now be described with reference to the drawings.

FIG. 1 shows a state in which the fixed mold 1 and the movable mold 2 are brought together at the mating surface 3, and the molten metal in the injection sleeve 6 is press-fitted into the cavity 7 by the inner and outer plungers 4 and 5. The tip end surface (right end surface) of 8 forms a part of the inner surface 9 of the movable mold 2 .

A fixed mold 1 is attached to a holder 10 on the frame, and has tie rods 11 for attaching cylinders for operating the inner and outer plungers 4 and 5.

The movable mold 2 is fixed to the right side of the holder 12, and the holder 12 has a horizontal tie bar 13 fixed to the holder 10.
It is supported on top of the tie bar 13 and can freely slide from side to side in the figure on the tie bar 13 by means of a toggle mechanism (not shown) or the like.

A plurality of ejector pins 8 are integrally fixed to the ejector plate 14, and are closely fitted into horizontal ejector pin holes provided at corresponding positions in the movable mold 2, so that the mold is closed as shown in FIG. 1,2
When it is closed, the tip surface is aligned with the inner surface 9 of the mold.

A plunger 15 integral with the extrusion plate 14 is supported by a bearing 16 of the holder 12, and faces a stopper (not shown) provided on the left side of the figure.

The movable mold 2 has a plurality of nozzle insertion holes 1 parallel to the extrusion pins 8 so as to open on the mating surface 3 surrounding the mold inner surface 9.
8 is provided, and a cylindrical spray nozzle 1 is inserted into this hole 18.
9 are slidably fitted together, and at the time of casting as shown in FIG. The end face (left end face) of the cut portion is in contact with the extrusion plate 14.

Each spray nozzle 19 is connected to an atomizer via a pipe 20.
21, and the atomizer 21 communicates with a solenoid valve 23 via a pipe 22.

24 is a pressurized release agent tank, 25 is a pressurized air tank, 26
is the control section.

For example, the control unit 26 applies an open signal to the electromagnetic valve 23 when a predetermined time required for taking out the cast product has elapsed after the movable mold 2 moves back as shown in FIG. 2 and the space between the molds 1 and 2 is opened. Specifically, it can be an electric circuit including a limit switch and a timer for detecting the position of the holder 12.

As shown in Figure 1, with molds 1 and 2 closed, plunger 4,
When the holder 12 is slid to the left in FIG. 1 in order to force the molten metal into the cavity γ and open the rear molds 1 and 2 for a predetermined time necessary for solidifying the molten metal, the plunger 15 integrated with the extrusion plate 14 hits the stopper, and the ejector pin 8 protrudes from the inner surface 9 of the movable mold 2 as shown in FIG. 2, whereby the casting is separated from the inner surface 9 of the mold 2 and falls downward.

On the other hand, the spray nozzle 19 is also pushed by the extrusion plate 14 and
As shown in the figure, it protrudes onto the mating surface 3 surrounding the mold inner surface 9, and the nozzle at the tip is exposed.

When the mold is opened as shown in Fig. 2 and a predetermined time required for taking out the casting has elapsed, the solenoid valve 23 is opened for a predetermined time in response to a command from the control unit 26, and the pressurized tanks 24 and 25 are released from the mold. The agent and air are supplied to the atomizer 21 via the electromagnetic valve 23 and the pipe 22, where they are mixed and atomized, and then passed through the pipe 20 and sprayed onto the inner surfaces of the molds 1 and 2 from the nozzle at the tip of each spray nozzle 19.

The nozzle of some spray nozzles 19 or the inner surface 9 of the moving mold 2
The nozzles of the remaining spray nozzles 19 are directed toward the inner surface of the fixed mold 1, so that the mold release agent is supplied to the inner surface of each mold only from the spray nozzle 19 incorporated in the movable mold 2. Ru.

When the preset time has elapsed, the solenoid valve 23 closes in response to a signal from the control unit 26, the spray from each nozzle stops, and the movable mold 2 continues to move to the right from the state shown in FIG. 2 to the state shown in FIG. The mold is then fitted with the fixed mold 1, and the next casting process begins.

In this way, the cylindrical spray nozzle 19 is fitted into the nozzle insertion hole 18 opened in the mold mating surface 3 surrounding the mold inner surface 9, and its tip is opposed to the mating surface of the fixed mold 1. When the base end face faces the extrusion plate 14, the mold can be opened in conjunction with the movement of the movable mold 2 (when the spray nozzle 19 can be protruded as shown in FIG. 2, and the spray nozzle 19 can be extended as shown in FIG. 1). When the mold is closed, it can be automatically retracted into the hole 18.

Therefore, the spray nozzle 19 can be provided at a position close to the inner surface 9 of the mold, making it easy to accurately spray a predetermined amount of mold release agent from a predetermined position when the mold is opened.

Also, the angle of the nozzle of the spray nozzle 19 is partially changed by moving the mold 2.
By directing the spray nozzle 19 toward the inner surface 9 of the fixed mold 1 and the other toward the inner surface of the fixed mold 1, it becomes possible to supply the mold release agent to the inner surfaces of both molds simply by incorporating the spray nozzle 19 into the movable mold 2.

Since the operator does not need to approach the mold, the working environment is improved, work efficiency is improved, and by automatically controlling the solenoid valve 23, waste of mold release agent can be avoided.

Since the nozzle insertion hole 18 is open to the mold mating surface 3, there is no risk that the spray nozzle 19 will be damaged by the molten metal, and the life of the spray nozzle will be extended.

The structure shown in FIG. 3 is suitable for the spray nozzle 19 in FIG. 1.

Reference numeral 31 in FIG. 3 denotes a cylindrical socket with an outer diameter that fits the nozzle insertion hole 18, the pipe 20 is connected to the base 32, and the socket is prevented from rotating by a key 34 fitted in a keyway 33.

35 is a holding plate, 36 is a bolt, and 31 is a plug.

38 is a pin having the same diameter as the socket 31, and the male threaded portion 39 is screwed into the corresponding female thread of the socket 31, and the lock nut 4
0, the axial position and the angle of the pin 38 are fixed.

The cylindrical portion 38' of the pin 38 is provided with two nozzles 41, 41', and the angle α of each nozzle with respect to the center line O-0 of the spray nozzle 19 is set.

β is different from each other, for example, α-45° and β-135°.

The cylinder surface 42 inside the pin 38 has a bottom portion 43 on the tip side.
A moving valve 43 having a diameter of 1.5 is tightly fitted and is prevented from rotating by a pin 44.

45 is a keyway.

The moving valve 43 has two communication holes 46 and 46', and when one nozzle 41 is aligned with the communication hole 46, the other nozzle 41' is not aligned with the communication hole 46'.
6' is offset from the nozzle 41' in the axial direction.

Reference numeral 47 is an adjustment screw that is screwed into a female thread provided at the tip of the cylinder surface 42, and a diametrically extending protrusion 48 on the tip surface of the moving valve 43 is fitted into a corresponding groove provided on the end surface of the adjustment screw 47. ing.

The mold release agent spray formed by the atomizer 21 is ejected from the nozzle 41 toward the inner surface of the mold via a passage 49 and a communication hole 46 in the nozzle.

When each spray nozzle 19 is assembled into a movable mold, the socket 310 is prevented from rotating using the key 34, and the overall length is adjusted by loosening the lock nut 40.

At this time, in order to use the spray nozzle 19 for spraying on the movable mold side, the position of the nozzle 41, that is, the distance from the mating surface 3, is determined, and the pin 38 is appropriately rotated relative to the socket 31 to direct the nozzle 41. and fix it with a lock nut 40.

Further, the injection amount is determined by screwing in the adjusting screw 47 from the outermost end.

In order to use another spray nozzle for spraying on the fixed mold side, the adjustment screw 47 is further screwed in advance to align the nozzle 41' and the communication hole 46'.

In this way, the nozzle 41 and the communication hole 46 are cut off, and a spray with an injection angle β is obtained.

Adjustment of the injection amount when selecting the nozzle 41' is also possible using the adjustment screw 4.
You can do the same with 7.

According to the structure shown in FIG. 3, one type of spray nozzle 19 can be used as two nozzles with different spray angles.

That is, by sliding the movable valve 43 using the adjusting screw 47, the nozzle opening 41.degree. 41' can be freely selected, and the degree of opening can be easily adjusted.

Since the movable valve 43 is prevented from rotating by the pin 44, the amount can be adjusted while continuing spraying.

Since the moving valve 43 is constantly pushed to the right in FIG. 3 by the internal mixed gas, the protrusion 48 meshes with the groove of the adjusting screw 47, thereby preventing the adjusting screw 47 from loosening.

Also, by screwing the pin 38 into the socket 31 and fixing it with the lock nut 40, you can adjust the overall nozzle length and the posture of the pin 38 (
angle) is easy to adjust.

[Brief explanation of the drawing]

1 and 2 are vertical cross-sectional views of the die-casting machine, and FIG. 3 is a vertical cross-sectional view of the spray nozzle. 2...-Movable mold, 18...-Nozzle insertion hole, 19...Spray nozzle, 8...-...
Push-out pin, 14...- Push-out plate, 3...
・Mating surface, 9...--Inner surface, 41°41'...
...Nozzle port, 38'--Cylindrical part, 42...Cylinder surface, 43'...Bottom, 43...
-Movement valve, 44.45...-Pin and keyway (
Example of anti-rotation mechanism), 47...-adjustment screw, 46
, 46'...Communication hole.

Claims (1)

[Scope of Claims] 1. A spray nozzle fitted into a nozzle insertion hole in a movable mold is made to protrude from the mold mating surface by an extrusion plate of an extrusion pin during extrusion of a casting, and after the casting is removed, the spray nozzle A spray of mold release agent is supplied to the inner surface of the mold, and the above spray is used when closing the mold after the spraying is finished. A method for spraying a mold release agent, characterized in that a Ray nozzle is retracted into a movable mold by a fixed mold. 2. A nozzle insertion hole is provided in the movable mold parallel or almost parallel to the extrusion pin hole, a cylindrical nozzle is fitted into the nozzle insertion hole, and the rear end surface of the nozzle is opposed to the extrusion plate of the extrusion pin, The length of the nozzle is set so that when the mold is closed, the nozzle tip is pushed by the stationary mold and retracted into the movable mold, and at least two nozzles are formed in different directions on the side wall of the cylindrical part of the nozzle tip. The sills in the cylindrical portion are provided at regular intervals. A cup-shaped moving valve having a bottom on the tip side is tightly fitted to the side wall of the valve via a detent mechanism, and the moving valve is brought into abutment with an adjustment screw threaded onto the nozzle tip. A mold release agent spray device characterized in that a communication hole connecting each nozzle to a valve is provided, the positions of the nozzle and the communication hole are shifted, and the nozzle can be switched by changing the position of a moving valve.