JPS62137162A - Nozzle device for hot chamber type die casting machine - Google Patents

Abstract

PURPOSE:To improve the durability and thermal efficiency of a nozzle heater by providing plural hollow grooves to a nozzle body in the longitudinal direction thereof and freely attachably and detachably fitting heater cases contg. sheathed heaters into said hollow grooves. CONSTITUTION:The plural longitudinal hollow grooves 6 are circumferentially bored to the cylindrical nozzle body 3 having a passage 2 for a molten metal. The sheathed heaters 8 having exposed terminals are freely attachably and detachably fitted and fixed into the heater cases 7 fitted into such hollow grooves 6 and the terminals are connected to a connecting terminal board 9. The cases 7 are constituted of a heat resisting alloy having the coefft. of thermal expansion equal to the coefft. of thermal expansion of the material forming the nozzle body 3. A heat insulating cylinder 10, a reflecting cylinder 11, and a cover 12 are respectively coated and fixed to the outside of the body 3. The heat conductivity to the nozzle is improved and the overheating of the heaters 7 is prevented by the above-mentioned mechanism. The durability and thermal efficiency of the nozzle heater are thus improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a nozzle device for a hot chamber die-casting machine (hereinafter simply referred to as a die-casting device).

[Technical background of the invention and its problems] In general, a die casting device includes a melting furnace that stores molten metal, an injection pump immersed in the molten metal melted in the melting furnace, and a molten WO"l outlet of the injection pump. A nozzle device joined to the nozzle device, a fixed mold with a molten metal inlet joined to the nozzle device, and a fixed mold that can be combined with the fixed mold to form a predetermined cavity. It consists of a mold device made of ilJ type.

In this die-casting device, the molten metal in the melting furnace is press-fitted into the cavity of the mold device by an injection pump through a nozzle device, and is solidified by cold IA to obtain a molded product.

In addition, in such a die-casting device, a heating device is installed in the nozzle device so that the molten metal in the nozzle neck does not solidify.

Conventionally, this heating device has used a sheathed heater or a band heater, and these have been wrapped around the outer periphery of the nozzle body of the nozzle device to perform heating.

However, simply wrapping the sheathed heater or the like around the nozzle body in this way is difficult and rarely maintains close contact between the nozzle body and the sheathed heater.

In other words, although normally a sheathed heater is initially close to the nozzle body, it separates from the body as the temperature rises, resulting in poor heat conduction and overheating, which easily breaks and has a short service life. There was a problem.

Furthermore, when using a band heater, it is impossible to make complete contact with the nozzle body from the beginning, so it cannot be used for nozzle devices for die-casting materials such as aluminum and magnesium that need to be heated to high temperatures. The problem was that I couldn't do it. Generally speaking, this band heater requires fastening fittings and large-scale wiring equipment, so even if you try to increase the thermal efficiency of the band heater by covering it with a heat insulating cover, etc., the problem is that the external size becomes large and difficult to handle. There was also.

[Object of the Invention] The present invention has been made in order to solve such conventional problems. The present invention aims to provide a nozzle device for a hot chamber die-casting machine that enables efficient heating, improves durability, and is compact and easy to handle, as well as easy to maintain.

[Summary of the Invention] A nozzle device for a hot chamber die-casting machine of the present invention includes a nozzle body having a molten metal passage, and a sheathed heater attached to the outer periphery of the nozzle body to heat the molten metal passage. In a nozzle device for a mold die-casting machine, a heater case is provided with a plurality of grooves along the longitudinal direction at predetermined intervals in the circumferential direction on the circumferential surface of the nozzle body, and has an outer shape that can fit into these grooves. By installing a sheathed heater inside the groove and removably fitting and fixing them into the groove, efficient heating is possible, the durability of the sheathed heater is improved, and it is compact, easy to handle, and easy to maintain. It is also designed to be easy to manage.

[Embodiments of the invention] Embodiments of the present invention shown in the drawings will be described below.

1 to 3 are a sectional view and a side view showing the appearance of a nozzle device according to an embodiment of the present invention.

As shown in these figures, the nozzle device of this example is
The main portion is composed of a cylindrical nozzle body 3 having a molten metal passage 2, a heat insulating nozzle case 4 fitted around the outer periphery of the nozzle body 3, and an electrical wiring connection portion 5.

As shown in FIGS. 1 and 2, on the outer circumferential surface of both ends of the nozzle body 3, at predetermined intervals in the circumferential direction,
A plurality of concave grooves 6,6, parallel to the axes of the rectangular cross sections are bored.

In each of these grooves 6, 6, a sheathed heater 8, which is attached to a heater case 7 with terminals 8q exposed, is detachably attached to the heater case 7 which fits into the groove 6 as shown in FIG. The mating is fixed. The terminals 8a of these sheathed heaters 8 are located on the outer periphery of the center of the nozzle body 3! It is connected to a connecting terminal block 9 attached to A, and is connected to the electrical wiring connecting part 5 via this connecting terminal block 9. The heater case 7 is made of a heat-resistant alloy having a coefficient of thermal expansion approximately equal to that of the material forming the nozzle body 3.

Roughly, on the outside of this nozzle body 3, a heat-retaining cylinder 10 made of a heat-insulating material, and a heat-retaining cylinder 11 whose inner surface is coated with a coating such as gold plating or tin oxide paint 1 to reflect heat rays are sequentially placed. A roughly metal nozzle cover 12 is fitted and fixed with bolts 13.

FIG. 5 is a sectional view schematically showing a die-casting device to which the nozzle device 1 of the above embodiment is attached.

In FIG. 5, reference numeral 14 indicates a melting furnace, and a melting pot 16 containing a molten metal 15 such as a zinc alloy is installed inside the melting furnace 14. Inside the molten metal 15 of the melting pot 16 is a gooseneck 1 attached to an injection frame 17.
The lower part of gooseneck 8 is immersed, and molten metal 15 is also stored in this gooseneck 18 via a communication port 19. An indexing cylinder 21 with a plunger 20 attached to its lower end is mounted above the injection frame 17, and the plunger r20 connects to the cylinder 18 housed in the gooseneck 18.
It is slidably inserted into a.

At the upper end of the gooseneck 1B, the nozzle device of the above embodiment connects one end of the molten metal passage 2 to the gooseneck 18.
It is attached to the molten metal injection port 22 of the On the other hand, the other end of the nozzle device 1 includes a fixed mold 23 and a movable mold 25 that is combined with the fixed mold 23 to form a predetermined cavity 24.
fixed to a fixed die plate 27 of a mold 26 consisting of
It is also connected to a fixed mold 23 having a molten metal inlet 28 .

In the die casting device constructed as described above (111), the molten metal 15 in the cylinder 18a is pressed by the lowering of the plunger 20 by the injection cylinder 21, and the molten metal 15 is transferred to the molten metal injection port 22J of the gooseneck 18: the molten metal passage of the re-nozzle device 1. 2, the molten metal is press-fitted into the cavity 24 from the molten metal inlet 28 of the fixed mold 23, where it is cooled and solidified, and the molded product is lifted up.

However, in this die-casting device, in the nozzle device 1, the heater case 7 into which the sheathed heater 8 is inserted and the nozzle body 3 are in good contact with each other, and the contact becomes even better as the temperature rises. 8
The heat generated by the nozzle is well transferred to the nozzle body, resulting in efficient heating.

Moreover, the sheathed heater 8 is prevented from overheating, and its service life is extended.

In the above embodiment, the shape of the recess 'ti6 provided on the outer periphery of the nozzle body 3 is rectangular in cross section because it can be easily molded or bored even when ceramics or a difficult-to-cut fully bending material is used. Therefore, the shape is not particularly limited to the above-mentioned shape, and the groove may have a V-shaped cross section or a U-shaped cross section, for example.

Further, the size of the groove is determined by taking into consideration the materials that constitute the nozzle body and the heater case.

For example, in the above embodiment, if the nozzle body is made of ceramics with low thermal conductivity or an alloy such as 5KD6, the width and depth of the groove should be 1.8 to 1.8 of the diameter of the sheathed heater.
About twice as much, or 1 in the case of low carbon steel with high thermal conductivity.
．． It is preferable to set it to about 5 times.

In the above embodiment, an example in which the grooves are provided parallel to the axis of the nozzle body has been described, but the grooves may be provided slightly inclined to the axis.

[Effects of the Invention] As explained above, according to the nozzle device for a hollow L-chamber die-casting machine of the present invention, a plurality of grooves are provided on the outer peripheral surface of the nozzle body, and a sheathed heater is inserted into these grooves. Since the heater case is removably fitted and fixed, heat conduction from the sheathed heater to the nozzle body is good, enabling efficient heating, preventing overheating of the sheathed heater, and improving durability. do. Furthermore, the entire device is small and easy to handle, and can be easily maintained and managed.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view showing an embodiment of a nozzle device for a hot chamber die-casting machine of the present invention, Fig. 2 is a longitudinal sectional view of the embodiment, and Fig. 3 is a side view showing the external appearance of the embodiment. 4 is a perspective view of a sheathed heater and a heater case constituting this embodiment, and FIG. 5 is a sectional view showing a die casting device equipped with a nozzle device. 1... Nozzle device 2... Molten metal passage 3... Nozzle body 6... Concave groove 7. ...... Heater case 8 ...... Sheathed heater 22 ...... Melting Q injection port 23 ...... Fixed type 28.・・・・・・Molten metal inlet agent Patent attorney Sa Suyama - Figure 5

Claims (3)

[Claims] (1) In a nozzle device for a hot chamber die-casting machine comprising a nozzle body having a molten metal passage and a sheathed heater attached to the outer periphery of the nozzle body to heat the molten metal passage, A plurality of longitudinal grooves are provided at predetermined intervals in the circumferential direction, and a sheathed heater is installed in a heater case having an outer shape that can fit into these grooves, and these are attached to and removed from the grooves. A nozzle device for a hot chamber die-casting machine that is characterized by being freely fitted and fixed. (2) A nozzle device for a hot chamber die-casting machine according to claim 1, wherein the groove is provided parallel to the axis of the nozzle body. (3) A nozzle device for a hot chamber die-casting machine according to claim 1, wherein the groove is provided at a slight inclination with respect to the axis of the nozzle body.