JPS63137561A - Hot chamber die casting machine - Google Patents

Abstract

PURPOSE:To automatically control various casting conditions strictly, to reduce the generation of a defective product and to quicken the countermeasure against defects by installing two sets of thermocouples whose depth from its heat receiving face varies at the vicinity of the nozzle outlet port of the title machine and detecting the temp. on the inner surface. CONSTITUTION:A temp. sensor 7 measuring the temp. of the inner surface of a nozzle 5 is set up at the vicinity of the outlet port of a molten metal pouring nozzle 5 to a die 6 of a hot chamber die casting machine. Two sets of thermocouples 7a, 7b whose depth dimension from a heat receiving face 7' differ are inserted into this temp. sensor 7 and the temp. including the speed of a heat conduction is measured with its detection. From this detection data a nozzle clogging, the heating of the nozzle 5 and the speed and casting pressure of a plunger chip 2 are automatically controlled, good casting is continued, the generation of defective product is drastically reduced, the countermeasure against defects is quickened and the productivity is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a hot chamber die casting machine.

<Conventional technology> In the casting method using a hot chamber die casting machine,
Molten metal temperature, mold temperature, plunger speed.

Unless casting conditions such as casting pressure are properly set, stable and sound castings (products) cannot be obtained.

However, in reality, each casting condition is currently set based on experience and intuition. That is, for example, even when a nozzle or gooseneck is heated with a gas burner and the molten metal is held so as not to solidify, conventionally, the color change due to heating of the outer surface of the nozzle or gooseneck is adjusted while taking care of it. , so not only is it a waste of gas, but
Naturally, it was difficult to consistently obtain stable and sound castings, as the molten metal would solidify at the nozzle exit due to the heat being carried away at the contact surface between the mold and the nozzle.

<Problems to be Solved by the Invention> The present invention has been made in view of the current situation, and it is an object of the present invention to provide a hot chamber die casting machine that can efficiently produce consistently stable and sound castings through automatic control. It is something to do.

Means for Solving the Problems> The hot chamber die casting machine of the present invention that achieves the above object is characterized by having a temperature sensor installed near the nozzle outlet for measuring the temperature of the inner surface of the nozzle. be.

<Function> The temperature sensor detects and measures the presence or absence of molten metal at the nozzle outlet and the temperature of the nozzle inner surface.Based on the information from the temperature sensor, the mechanism for heating the nozzle or gooseneck is adjusted, and the plunger tip is heated. Control speed and casting pressure, as well as melt temperature and mold temperature.

<Example> Hereinafter, an example of implementing the present invention will be described based on the drawings.

FIG. 1 is a schematic cross-sectional view showing an embodiment of a hot chamber die casting machine according to the present invention, in which 1 is an injection cylinder, 2 is a plunger tip, 3 is a sleeve, 4 is a gooseneck, and 5 is a gold plate from the gooseneck 4. A nozzle for injecting the melt IIa into the cavity of the mold 6, and 7 a temperature sensor for measuring the temperature near the outlet 5a of the nozzle 5.

The temperature sensor 7 is constructed by installing two sets of thermal lightning pairs 1a and 1b with different depths L+ and Lz from their heat receiving surfaces 7°. That is, the inside of one case 7C is partitioned into two in the axial direction to form installation holes 7d and 7e,
A thermal lightning pair 8 is installed on the inner wall surface at the tip of both installation holes 7d and 7e.
A pair of metal wires 1°a, 7 that constitute a, 8b
°b and each installation hole 7d from the heat receiving surface 7'.
, Distance (depth dimension) L+ to the tip inner wall surface of 7e,
The L2 is configured differently.

By configuring the temperature sensor 7 in this way, the heat receiving surface 7
The exact temperature at ' can be determined. The temperature sensor 7 detects and measures the presence or absence of molten metal passing through the outlet 5a of the nozzle 5, the temperature of the molten metal, and the inner surface temperature near the outlet 5a of the nozzle 5.
Place the heat-receiving surface 7' of the nozzle 5 near the nozzle outlet 5a or the electric machine position (locate ring 8).
It is installed so that it faces into the passage hole.

During casting, the injection cylinder 1 is operated to fill the cavity of the mold 6 from the nozzle 5 through the gooseneck 4 with the plunger tip 2 and sleeve 3, and then solidify up to the mouth part. Immediately after this progresses, the injection cylinder 1 is returned, and after waiting for the casting (product) in the cavity to solidify, the mold is opened and the casting (product) is taken out. In this series of steps (casting cycle), the temperature sensor 7 continuously obtains information regarding the presence or absence of molten metal at the outlet 5a of the nozzle 5, the molten metal temperature, and the inner surface temperature near the nozzle outlet.
The mechanism for heating the nozzle or gooseneck, the speed of the plunger tip, casting pressure, mii temperature, mold temperature, and other casting conditions are continuously controlled by automatic control based on information from the machine.

<Effects of the Invention> Since the hot chamber die casting machine of the present invention is configured in this manner, the melting WA 11 degrees, the mold temperature m degrees, and the casting pressure can be controlled automatically based on the information from the 1[t7 sensor.

Casting conditions such as mold opening time, heating temperature of the nozzle or gooseneck, and injection speed can be continuously and strictly controlled with high precision.

Therefore, it is possible to maintain the hot chamber die-casting machine under optimal conditions at all times, and the incidence of defective products can be greatly reduced.Furthermore, 100% inspection and processing method selection are easy, and the process up to the post-process is easy. It is possible to set up a production line for a system with zero defects, and furthermore, it is possible to expect effects such as being able to easily and quickly identify the location where defects occur, and making it easier to take countermeasures against the defects.

Furthermore, it is possible to prevent clogging at the nozzle outlet due to solidification of molten metal, and at the same time, it is possible to prevent wasted energy when heating the nozzle or gooseneck.

Therefore, the intended purpose can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is a sectional view showing an embodiment of the temperature sensor according to the invention. In the figure, 5 is a nozzle, 5a is a nozzle outlet, and 7 is a temperature sensor.

Claims (2)

[Claims] (1) A hot chamber die casting machine characterized in that a temperature sensor for measuring the temperature of the inner surface of the nozzle is installed near the exit of the nozzle. (2) The hot chamber die-casting machine according to claim (1), wherein the temperature sensor is constructed by installing two sets of thermocouples at different depths from the heat receiving surface.