JP2808050B2 - Method and apparatus for measuring hot water temperature in vertical injection die casting - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for measuring the temperature of a molten metal, which can accurately measure the temperature of molten metal in vertical injection die casting.

[0002]

2. Description of the Related Art Conventionally, when performing vertical injection die casting, the temperature of a molten metal (5a ') in an injection sleeve (4') must be accurately measured. As a temperature measuring method, as shown in FIG. 6, a thermocouple (7 ') is inserted into a hole (4a') formed in the side surface of the injection sleeve (4 '), and the temperature of the injection sleeve (4') is measured. Then, the temperature of the molten metal in the injection sleeve (4 ') was estimated.
However, there are various types of metals such as Al, Zn, and Mg, and the melting temperature and thermal conductivity are different, so the injection sleeve
It was very difficult to know the temperature of the molten metal in (4 ') accurately.

Therefore, a method of directly inserting a thermocouple (7 ') into the molten metal (5a') has been considered. However, if the solid raw material (5 ') is not melted, it is necessary to insert the thermocouple (7'). When the thermocouple (7 ') is inserted after melting, a thermowell (7') is inserted into the thermocouple (7 ').
Since a ′) was adhered, the reaction to the temperature change due to immersion in the molten metal (5a ′) was slow, and it was not possible to accurately measure the molten metal temperature in real time.

[0004] Immediately after the solid material (5 ') is dissolved, a thermocouple (7')
It was very difficult to insert this, and it was considered impossible to automate it.

Further, when the solid raw material (5 ') is dissolved in the atmosphere as shown in FIG. 5, the dissolved metal reacts with oxygen in the atmosphere to generate a hard oxide (5b'). When the oxide (5b ′) is mixed in the casting, casting defects are caused. For example, in the case of a strength component, cracks are generated by the oxide (5b '), and in the case of a processed product, the blade is worn by the oxide (5b').

[0006]

The first problem to be solved by the present invention in view of the above problems is to automatically and accurately measure the temperature immediately after the solid raw material is melted. 2 is to dissolve the solid raw material in an inert gas atmosphere,
The purpose is to prevent oxides from being mixed into the molten metal.

[0007]

According to a first aspect of the present invention, there is provided a method according to the present invention, wherein a molten metal (5a) in an injection sleeve (4) communicating with a mold cavity is pushed up by a tip (27) and injected into the mold cavity. In the vertical injection die-casting molding method, the solid material (5) is supplied to the injection sleeve (4) and heated and the temperature measuring terminal (7) is pressed against the solid material (5), and the solid material (5) The temperature of the molten metal (5a) is measured by immersing the temperature measuring terminal (7) in the molten metal (5a) simultaneously with the melting of the molten metal (5a). It can automatically and accurately measure the temperature.

In order to carry out the first method, the apparatus of the present invention comprises: an injection sleeve (4) communicating with the mold cavity; a raw material heating means (9) provided on the injection sleeve (4); sleeve
A tip (27) slidably provided in (4) for pushing up the molten metal (5a) melted in the injection sleeve (4) into the mold cavity.
After the solid raw material (5) is supplied to the injection sleeve (4) when the mold is opened, the temperature measuring terminal (7) is pressed against the solid raw material (5), and the temperature is measured when the solid raw material (5) is melted. Resilient means (11) for immersing the terminal (7) in the molten metal (5a); and the resilient means (11)
And a temperature measuring terminal (7) attached to the device. "

According to a second aspect of the method of the present invention, there is provided "a vertical injection die-casting device which presses up a molten metal (5a) in an injection sleeve (4) communicating with a mold cavity by a tip (27) and injects the molten metal into the cavity. In the molding method, the solid material is added to the injection sleeve (4).
After supplying (5), the solid raw material (5) in the injection sleeve (4) is heated in a heated inert gas atmosphere, and the temperature measuring terminal (7) is pressed against the solid raw material (5) to solidify the solid raw material (5). The temperature measuring terminal (7) is immersed in the molten metal (5a) at the same time that the raw material (5) is melted.
Measuring the temperature of (5a) ”.
Thereby, the temperature of the molten metal (5a) immediately after melting can be automatically and accurately measured without generating the oxide (5b).

In order to carry out the second method, the apparatus of the present invention comprises: an injection sleeve (4) communicating with the mold cavity; a raw material heating means (9) provided on the injection sleeve (4); sleeve
A tip (27) slidably provided in (4) for pushing up the molten metal (5a) melted in the injection sleeve (4) into the mold cavity.
After the solid material (27) is supplied to the injection sleeve (4) when the mold is opened, the temperature measuring terminal (7) is pressed against the solid material (5), and the temperature measuring terminal ( 7) a resilient means (11) for immersing the molten metal (5a) in the molten metal (5a), a temperature measuring terminal (7) mounted on the resilient means (11), and an inert inside of the injection sleeve (4). And inert gas supply means (12) for supplying an inert gas (12a) to the injection sleeve (4) in order to maintain an atmosphere.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the illustrated embodiments, but the present invention is not limited thereto. 1 and 2 are a partial schematic cross-sectional view and a cross-sectional view taken along line XX of an example of a vertical injection die casting apparatus according to the present invention, centering on an injection apparatus (2). In the figure, (1) shows a mold, (2) shows an injection device, (3) shows a tilting mechanism, and (6) shows a toggle mechanism.

The mold (1) comprises a fixed mold (1a) and a movable mold (1b). The fixed mold (1a) is mounted on a fixed plate (14), and the movable mold (1b ) Indicates the movable mold mounting plate (1
It is fixed to the moving plate (15) via c). (19) is an extrusion pin for extruding a molded product. Moving plate (15)
Is slidably mounted on the tie bar (17), and opens and closes the movable mold (1b) by the action of the toggle mechanism (6). (6a) is a toggle link of the link mechanism. (1
Reference numeral 6) denotes a support roller mounted on the moving plate (15) and reciprocating on the rail under the load of the moving plate (15).

The injection device (2) comprises an injection sleeve (4), a chip (27) slidably driven in the sleeve (4),
The plunger rod (10a) equipped with (27) at the tip and the injection cylinder (1) for operating the plunger rod (10a)
0).

The tilting mechanism (3) is mainly composed of a frame (20) for pivotally supporting the injection device (2) at its center and a tilt cylinder (8) for tilting the injection device (2). (6) is the tilt axis.

The lubricant applying device (21) includes a fixed plate (14)
(22), an arm (23) attached to the post (22), and a lifting cylinder attached to the tip of the arm (23).
(24) and a lubricant injection nozzle (25) mounted at the lower end of the lifting cylinder (24). (27) is a rotary handle for operating the expansion and contraction of the arm.The lubricant injection nozzle is adjusted according to the thickness of the mold (1) and the tilt position of the injection sleeve (4).
(25) is for setting the position.

The raw material heating means (9) provided on the injection sleeve (4) is, for example, a heater or an induction heating coil wound around the outer circumference of the injection sleeve (4). The temperature is adjusted to keep.

As shown in FIG. 1, the inert gas supply means (12) includes a rotary actuator (13) mounted on the frame side, an inert gas supply nozzle (12) mounted on the rotary actuator (13), Active gas supply source (17), pressure reducing valve (29) provided in the supply system connecting inert gas supply source (17) and inert gas supply nozzle (18), solenoid valve for opening and closing (30) , The flow control valve (31) and the copper spiral pipe (32) and the spiral pipe (32),
A tube heater (33) for heating the inert gas flowing in the spiral pipe (32).

The temperature measuring terminal (7) uses a thermocouple in this embodiment, and as shown in FIGS. 3 and 4, a stopper bracket (34) attached to the tip of the inert gas supply nozzle (18). ) Is inserted and fixed in a protective tube (7a) slidably mounted on the protective tube. End stopper (35) at the upper end of protection tube (7a)
A spring receiver (36) is mounted on the lower end, and a compression spring, which is a resilient means (11), is disposed between the spring receiver (36) and the stopper bracket (34). And urges the protective tube (7a) downward. In addition, protection tube (7
The smaller the thickness of a), the better.

Next, the operation of the molding apparatus will be described with reference to the drawings. The movable link (1b) is separated from the fixed mold (1a) by contracting the toggle link (6a) of the toggle mechanism (6), and the mold is opened.
Subsequently, the tilting mechanism (3) is operated to move the injection device (2) to the tilt axis.
Rotate around (6) to tilt the injection device (2).

Next, the lifting cylinder (24) is operated to lower the lubricant injection nozzle (25) so that the injection sleeve (4) is inclined between the parting surfaces (P) of the molds (1a) (1b) and the inclined injection sleeve (4). ), And the lubricant (26) is ejected from the lubricant injection nozzle (25), and the parting surface (P) of the mold (1a) (1b) and the entire inner peripheral surface of the injection sleeve (4) are ejected. Then, a lubricant (26) is applied to the top and side surfaces of the chip (27).

Subsequently, the solid raw material (5) is supplied to the injection sleeve (4), and the tilting mechanism (3) is operated in the reverse direction to cause the injection device (2).
Upright. Next, the rotary actuator (13) is operated, and the compression spring (11) is deflected to cause the thermocouple (7)
The protective tube (7a) is elastically contacted with the solid raw material (5). At the same time, the inert gas (12a) is jetted from the inert gas supply nozzle (18) into the injection sleeve (4) to wrap the solid material (5) in an inert atmosphere.

After that, the heater (9) is energized to heat the injection sleeve (4), and the solid material (5) in the injection sleeve (4) is melted.

When the solid raw material (5) is heated and melted, at the same time, the compression spring (11) is extended by its elastic force until the end stopper (35) comes into contact with the stopper bracket (34), and the thermocouple ( The tip of the protective tube (7a) of (7) is immersed in the molten metal (5a), and the temperature of the molten metal (5a) is measured immediately. During this time, a high-temperature inert gas (12a) is constantly injected from the inert gas supply nozzle (18) into the injection sleeve (4), and the solid material (5) and the molten metal in which the solid material (5) is dissolved
(5a) is wrapped in an inert atmosphere. As a result, the upper end of the injection sleeve (4) is kept at a high temperature without being cooled by the inert gas (12a), and no solidified layer is generated on the surface of the molten metal (5a) in the injection sleeve (4). , As a whole in a molten state.

What is important here is the protection tube (7) of the thermocouple (7).
Since the tip of a) has been in contact with the solid material (5) since it was heated, the temperature of the solid material
Along with melting (5), the tip of the thermowell (7) protective tube (7a) is
The point is that the temperature measurement immediately after immersion can be accurately performed without causing the temperature of the molten metal (5a) to decrease even when immersed in a).

On the other hand, when the thermocouple (7) cooled after the solid raw material (5) is melted is immersed in the molten metal (5a), the thermocouple (7)
It takes a long time to raise the temperature of the sample, and the temperature measurement immediately after immersion cannot be performed accurately.

When the dissolution of the solid raw material (5) is completed, the rotary actuator (13) is operated in the reverse direction so that the thermocouple (7)
And the inert gas supply nozzle (18) from the parting surface (P) of the mold (1), and then the toggle link of the toggle mechanism (6)
(6a) is extended and the moving mold (1b) is closed, and both molds (1a) (1b)
The tip of the injection sleeve (4) is connected to the runner hole provided on the parting surface (P).

Finally, the injection cylinder (10) is operated,
The tip (27) connected to the plunger rod (10a) is quickly raised via the plunger rod (10a), and the molten metal (5a) is pushed up to cast the molten metal (5a) into the mold cavity.

When the injected molten metal (5a) solidifies in the mold cavity, the toggle mechanism (6) is contracted again to separate the movable mold (1b) from the fixed mold (1a), open the mold, and extrude. The molded product is extruded with the pin (19). Hereinafter, the above operation is repeated.

[0029]

According to the first method of the present invention, the solid material is supplied to the injection sleeve and heated, and at the same time, the temperature measuring terminal is pressed against the solid material, and the temperature measuring terminal is placed in the molten metal simultaneously with the dissolution of the solid material. Since the temperature of the molten metal is measured by immersion, the temperature immediately after dissolution of the solid raw material can be directly and automatically measured for each shot, and the temperature control of the casting material can be performed extremely accurately. There is an advantage that the temperature of the molten metal for each shot is stable and defects due to a change in the molten metal temperature for each shot are eliminated. In addition, since the solid raw material is supplied to the injection sleeve and heated, and the temperature measuring terminal is pressed against the solid raw material, the temperature measuring terminal also rises as the temperature of the solid raw material increases. Even if the temperature measuring terminal is immersed in the molten metal, there is an advantage that the temperature of the molten metal does not decrease and the temperature of the molten metal can be measured immediately.

According to the second method of the present invention, after the solid material is supplied to the injection sleeve, the solid material in the injection sleeve is heated in a heated inert gas atmosphere, and the temperature measuring terminal is connected to the solid material. And the temperature of the molten metal is measured by immersing the temperature measuring terminal in the molten metal at the same time as the melting of the solid raw material, so that not only the temperature control of the cast material can be performed very accurately as described above, but also the molten metal Can be cast in an extremely clean state without being oxidized by the oxygen in the atmosphere. For example, in the case of strength parts, cracks are generated by oxides, and in the case of processed products, blades are worn by oxides. It has the advantage of eliminating the cause of failure, and has the advantage of heating the inert gas, so that the upper end of the injection sleeve is kept at a high temperature and the solidified layer on the surface of the molten metal is not generated. Ku, can be cast across in solution, casting the solidification layer is never such as mixed.

[Brief description of the drawings]

FIG. 1 is a partial schematic vertical sectional view mainly showing an injection apparatus as an example of a vertical injection die casting apparatus of the present invention.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is a cross-sectional view of an injection sleeve in a state where a temperature measuring terminal is elastically contacted with a solid raw material according to the present invention.

FIG. 4 is a sectional view of an injection sleeve in a state where a temperature measuring terminal is immersed in a molten metal according to the present invention.

FIG. 5 is a plan view of FIG. 3;

FIG. 6 is a sectional view of an injection sleeve showing a method for measuring the temperature of molten metal in a conventional example.

[Explanation of symbols]

(1)… Mold (2)… Injection device (3)…
Tilt mechanism (4)… Injection sleeve (5)… Solid raw material (5a)…
Molten metal (6) Toggle mechanism (7) Temperature measurement terminal (9)
Raw material heating means (10)… Injection cylinder (11)… Spring means (12)…
Inert gas supply means (12a)… Inert gas (27)… Chip

Continued on the front page (72) Inventor Akihisa Inoue 11-806 Kawauchi Housing, Kawauchi, Aoba-ku, Sendai City, Miyagi Prefecture (72) Inventor Hiroaki Kawauchi 523 No. 523 Nishinoyama, Fukusato, Futami-cho, Akashi City, Hyogo Prefecture No.1 Inside Toyo Machine Metal Co., Ltd. (72) Inventor Takao Nakamura 523 No. 1 Nishinoyama, Futami-cho, Futami-cho, Akashi City, Hyogo Prefecture Inside Toyo Machine Metal Co., Ltd. (56) References JP-A-63-306771 JP-A-2-117762 (JP, A) JP-A-1-254364 (JP, A) JP-A-61-46050 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B22D 17/32 B22D 17/12 B22D 17/20

Claims (4)

(57) [Claims] 1. A vertical injection die-casting molding method in which a molten metal in an injection sleeve communicating with a mold cavity is pushed up by a chip and injected into the mold cavity to form a mold. A method for measuring the temperature of hot water in vertical injection die casting, characterized in that a terminal is pressed against a solid raw material and a temperature measuring terminal is immersed in the molten metal at the same time as the solid raw material is melted to measure the temperature of the molten metal. 2. An injection sleeve communicating with the mold cavity,
A raw material heating means provided in the injection sleeve, a chip slidably provided in the injection sleeve, for pushing up molten metal melted in the injection sleeve to the mold cavity, and a solid raw material in the injection sleeve when the mold is opened. After the supply, the temperature measuring terminal is pressed and urged against the solid raw material, and when the solid raw material is dissolved, a resilient means for immersing the temperature measuring terminal in the molten metal, and a temperature measuring terminal mounted on the resilient means A hot water temperature measuring device in vertical injection die casting, characterized by comprising: 3. A vertical injection die-casting molding method in which a molten metal in an injection sleeve communicating with a mold cavity is pushed up by a chip and injected into the mold cavity to form a mold. It is characterized in that the solid material in the injection sleeve is heated in an active gas atmosphere, the temperature measuring terminal is pressed against the solid material, and the temperature measuring terminal is immersed in the molten metal at the same time as the solid material is melted to measure the temperature of the molten metal. Hot water temperature measurement method in vertical injection die casting. 4. An injection sleeve communicating with the mold cavity,
A raw material heating means provided in the injection sleeve, a chip slidably provided in the injection sleeve, for pushing up molten metal melted in the injection sleeve to the mold cavity, and a solid raw material in the injection sleeve when the mold is opened. After the supply, the temperature measuring terminal is pressed against the solid raw material, and when the solid raw material is melted, a resilient means for immersing the temperature measuring terminal in the molten metal, and a temperature measuring terminal mounted on the resilient means, An apparatus for measuring hot water temperature in vertical injection die casting, characterized by comprising inert gas supply means for supplying an inert gas to the injection sleeve so as to maintain the interior of the injection sleeve in an inert atmosphere.