JPS5819002Y2 - Injection device for die casting machine - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an injection device for a die-casting machine.

More specifically, heating the outer periphery of the lower counter sleeve,
This invention relates to an injection device for a die-casting machine that cools the outer periphery of the upper plunger and smoothly fills the plunger, counter, etc. with molten metal without reducing the heat value of the molten metal.

Molten metal is stored in a sleeve between the upper plunger and the lower counter, the upper plunger is lowered to pressurize the hot water, and at a predetermined plunger lowering position, the lower counter is lowered and the cavity provided in the sleeve and Open the opening that connects,
Vertical die casting machines that pressurize and fill hot water into a cavity are known.

In such a molten metal injection device for a die casting machine, the injection sleeve is divided along with the mold for convenience of opening and closing the mold, and the plunger is fitted into the upper plunger sleeve and the counter is fitted into the lower counter sleeve to perform the above operations.

The hot water is stored in a plunger sleeve whose lower side is closed with a counter, and is kept warm by a heating means to ensure liquid phase fluidity of the hot water and to smoothly fill the cavity.

Conventional die-casting machines have the above-mentioned structure, so the heating part and the cooling part are formed on one sleeve, that is, the outer periphery of the sleeve on the plunger side. There is a difference in thermal strain between the parts, and since the sleeve is filled under pressure with a plunger, etc., this strain creates a gap between the plunger tip and the sleeve, causing hot water to blow up when pressurized by the plunger. As a result, this solidifies and causes flashing, etc., which impedes smooth operation of the plunger.

That is, it is difficult to expect smooth molten metal filling work.

The present inventor devised the present invention in view of the above-mentioned problems caused by heating and cooling in the injection device of a die-casting machine, and to solve the problems.

The purpose of the present invention is to heat the outer periphery of the lower counter sleeve and cool the outer periphery of the upper plunger sleeve. To provide an injection device for a die-casting machine capable of smoothly performing molten metal filling work.

Next, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

This reveals further objects and advantages of the present invention.

FIG. 1 shows a first embodiment of the invention.

The die-casting machine 1 consists of an upper mold 2 and a lower mold 3, and the figure shows only a portion including an injection device 4, and omits the cavity and the like.

The injection device 4 includes a plunger sleeve 5 provided on the upper die 2 side, and a plunger 6 slidably fitted into the plunger sleeve 5.

It also includes a counter sleeve 7 that faces the sleeve 5 provided on the lower die 3 side, and a counter 8 that is slidably fitted into the counter sleeve 7.

5, 7, and 8 are configured to have the same diameter.

The upper end 7a of the counter sleeve 7 is located below the mold matching surfaces 2a, 3a of the upper and lower molds 2, 3 by a predetermined amount, while the lower end 5a of the plunger sleeve 5 protrudes downward from the mold matching surfaces 2a, 3a, and is in the mold mating state. At this point, the opposing ends 5a and 7a come into contact with each other.

A communicating recess 9 is provided in a portion of the lower mold 3 adjacent to the counter sleeve 7 and is recessed downward from the mold matching surface 3a. 10, and the upper edge of the opening 10 is located slightly below the mold matching surface 3a.

A runner 11 that partially communicates with the recess 9 is formed in a part of the mold matching surface 2a of the upper mold 2, and in the mold matching state, the runner 11 is on the same horizontal plane as the mold matching surfaces 2a and 3a, or slightly It's above this.

The above-mentioned counter sleeve 7 is provided on its outer periphery so as to surround the frame 12 and the like to house an induction heating coil 13 and the like, and a heating means 14 is attached to the outer periphery of the sleeve, and a jacket is provided on the outer periphery of the plunger sleeve 5. 15, and a cooling water passage 16 is provided between this 15 and the outer wall of the sleeve.
is provided to constitute the cooling means 17.

In the above process, after the upper and lower molds 2 and 3 are matched, the molten metal M is poured from above the upper member 5 of the injection sleeve, and the lower sleeve 7,
That is, within the counter leaf, the counter 8 is at the lowest position as shown in the figure, hot water is stored in the space above the counter 8 in the sleeve 7, and the hot water level M1 is below the mold matching surfaces 2a and 3a.

The counter sleeve 7 is heated by the heating means 14 on the outer periphery, and the hot water stored on the counter 8 is kept warm by the heat.
Liquid phase fluidity is maintained.

- The plunger sleeve 5 on the front lens side is cooled by the cooling means 17, and thermal deformation of the sleeve 5 due to the molten metal is prevented.

Then, the plunger 6 is lowered to fit into the sleeve 5 as shown in the figure, and then lowered.

The plunger 6 is lowered, for example, until it touches the hot water level M1, and is stopped and held at this position.

In this case, since the sleeve 5 is cooled, there is no thermal deformation, and the plunger 6 slides smoothly, and even if the lower surface of the plunger 6 contacts the molten metal M and is heated, the deformation between the two is minimized as much as possible. be done.

Thereafter, the counter 8 is raised, and the hot water M is pushed up by the upward movement of the counter 8, and since the upper surface is restrained by the plunger 6, it is pushed out from the opening 10, and moves through the communication recess 9 and the runner 11 to a cavity (not shown). , filled.

After the primary filling by such extrusion, the plunger 6 is then lowered at the upper limit of the counter 8 to perform secondary pressurized filling.

In this way, since the hot water filled in the injection sleeve is forcibly heated within the counter sleeve, which is a storage section, there is little decrease in the amount of heat, and it is possible to maintain liquid phase fluidity and ensure smooth filling.

Since the counter 8 only pushes up the hot water and moves it into the cavity, no pressurizing force is generated.Therefore, no hot water is inserted between the counter 8 and the sleeve 7, and the hot water is simply pushed up. Therefore, a smooth filling operation can be expected.

On the other hand, since the outer periphery of the plunger sleeve 5 on the pressurizing side is cooled, thermal distortion and deformation of the sleeve 5 are minimal, and the gap between the sleeve and the plunger tip is suppressed as much as possible to ensure stability and smooth filling. The operation will take place.

FIG. 2 shows a second embodiment of the invention.

In the figure, 101 is a die-casting machine, 102 is an upper mold, and 103
104 is a lower mold, 104 is an injection device, 105 is a plunger sleeve, 106 is a plunger, 107 is a counter sleeve, 108 is a counter, 109 is a recess, 110 is an opening,
Reference numeral 111 is a runner, 114 is a heating means, and 117 is a cooling means, and their respective operations and structures are the same as those described above.

However, in this embodiment, the counter sleeve 107 has a large diameter,
The plunger sleeve 105 is made small in diameter, and the counter 108 and plunger 106 fitted therein are set in correspondingly large and small diameters.

The sleeves 105 and 107 are provided concentrically, and the lower end 105a of the plunger sleeve 105 protrudes to a predetermined length into the upper part of the counter sleeve 107 and is recessed therein.

The lower end 105a of the sleeve 105 is provided on the same horizontal plane as the lower end 110a of the opening 110 provided on the counter sleeve 107 side, or at a position substantially close thereto, and the inner wall of the sleeve 107 and the lower outer wall of the sleeve 105 fitted thereto There is a space between.

In this embodiment as well, the pouring, storage, and filling operations of hot water are the same as those described above.The molten metal M is stored in the sleeve 107 on the counter 108, and the plunger 106 is lowered to reach the hot water level M1.
and move the counter 108 upward to move hot water into the cavity and fill it.

By the way, the hot water level M1 is the lower end 1 of the plunger sleeve 105.
The sleeve 105 is cooled because it is above 05a.
, the plunger 106 comes into contact with the molten metal surface M1, and a coagulation film is generated at this part. However, after the primary filling by the push-up movement by the counter 108, the coagulation that occurs on the molten metal surface M1 in contact with the plunger 106 occurs during secondary pressurized filling by the plunger 106. The film is held in the sleeve 105, and the coagulated film is finally extruded during secondary filling, thus preventing the coagulated film from entering the field, and obtaining a die-cast product of good quality without any entanglement of the coagulated film. I can do it.

As is clear from the above, according to the present invention, while heating the molten metal, thermal distortion and deformation of the plunger sleeve on the pressurizing side can be prevented, and the occurrence of hot water being inserted between the sleeve and the plunger can be prevented. It can ensure smooth work.

In addition, the above-mentioned smooth filling operation can be achieved simply by receiving and storing the molten metal in the counter sleeve, heating the sleeve, and providing a cooling section around the plunger sleeve, but there is no need to install special equipment due to the structure. It is simple and has no problems.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a longitudinal cross-sectional view of the first embodiment, and FIG. 2 is a similar view of the second embodiment. In addition, 1,101 in the drawing is a die-casting machine, 4,104
5, 105 is the sleeve of the plunger 6.106, 7.107 is the sleeve on the cowlator 8, 108 side, 14, 114 is the heating means, and 17, 117 is the cooling means.

Claims (1)

[Scope of utility model registration request] In a die casting machine in which the injection sleeve is filled with molten metal and the molten metal is pressurized between a plunger and a counter, a heater such as an induction heating coil is provided on the outer periphery of the injection sleeve on the counter side to heat it, and the molten metal is cooled on the outer periphery of the plunger side. An injection device for a die-casting machine, characterized in that the injection device is configured to provide a cooling passage.