JP2000061603A - Vertical injection device and vertical injection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sufficiently fill molten metal even in a cavity having thin thickness for casting the thin product and to execute the fine adjustment of supplying quantity of the molten metal even after supplying the molten metal into a vertical injection device. SOLUTION: The vertical injection device is provided with dies 32a, 32b having the cavity 31 and a vertical injection sleeve 33 communicated with the cavity 31. In the side wall at the lower part of the vertical cylinder sleeve 33, a molten metal supplying hole 34 is opened, and a molten metal supplying tube 35 is communicated with the molten metal supplying hole 34. In the side wall at the upper part of the vertical injection sleeve 33, a supplied molten metal recovering hole 37 is opened, and a recovering connecting hole 38 is communicated with the supplied molten metal recovering hole 37 through a seal plug 45. The other end of the recovery connecting hole 38 is connected with the molten metal supplying tube 35. In the vertical injection sleeve 33, a plunger tip 40 is slidingly arranged in the vertical direction and the plunger tip 40 is vertically driven with a driving cylinder.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical injection device and a vertical injection method for injecting a molten metal into a cavity of a mold, and more particularly, to reliably fill the molten metal into a thin-walled cavity. Vertical injection device and vertical injection method.

[0002]

2. Description of the Related Art A conventional vertical injection device is, for example, Japanese Patent Publication Sho 56
-26509 publication. This conventional vertical injection device is shown in FIGS.

As shown in FIGS. 5A to 5D, in a conventional vertical injection device 20, an upper mold 1 and a lower mold 2 correspond to each other, and the mold is opened / closed and tightened by hydraulically driving. It is like this. A cavity 3 is formed by the upper die 1 and the lower die 2.

A plunger sleeve 4 is connected and fixed to the lower mold 2, and a plunger tip 5 is connected to a hydraulic cylinder (not shown) via a plunger rod 6 in the plunger sleeve 4 so as to slide. .

Further, the limit switch 7 is adapted to come into contact with a projection 8 attached to the plunger rod 6 at a fixed position when the plunger rod 6 moves up and down.

A molten metal holding furnace 9 is installed below these devices to heat and hold the molten metal 10 used for casting. The molten metal 10 of the heat insulation furnace 9 is passed through the hot water supply pipe 12 by the electromagnetic pump 11, and is supplied from the hot water supply port 13 of the side wall of the plunger sleeve 4 to the plunger sleeve 4 and the cavity 3.
It will be supplied inside.

The conventional vertical injection apparatus 20 having such a structure is used in the following vertical injection method. That is, as described in Japanese Examined Patent Publication No. 56-26509, first, the molten metal 10 is opened and closed freely (see FIG. 5 (d)) from a heat insulation furnace 9 communicating with a hot water supply port 13 by a hot water supply pipe 12. The cavity 3 and the plunger sleeve 4 formed by 2 are supplied and filled by the electromagnetic force (or pressurized gas) of the electromagnetic pump 11 through the hot water supply port 13 of the side wall of the plunger sleeve 4 (FIG. 5 (b)). )reference).

Next, the plunger tip 5 slidable in the plunger sleeve 4 is raised (advanced), and the hot water inlet 13
The excess molten metal 10 is discharged from the hot water supply port 13 to the hot water supply pipe 12 by the stroke up to. The hot water supply 10 discharged from the plunger sleeve 4 into the hot water supply pipe 12 is circulated to the warming furnace 9 by operating the electromagnetic pump 11 in the opposite direction.

Thereafter, the plunger tip 5 is further raised to close the hot water supply port 13, and the hot water supply 10 filled in the cavity 3 is solidified by applying a high pressure by the plunger tip 5 (see FIG. 5 (c)).

The structure and operation similar to those of the vertical injection device described above are also described in Japanese Patent Laid-Open No. 9-323144.

[0011]

However, the above-mentioned conventional vertical injection apparatus 20 is for supplying and filling the molten metal 10 into the molds 1 and 2 by the electromagnetic force or the pressurized fluid. There is a case where the molten metal 10 is insufficient and the cavity 3 is not sufficiently filled. Especially in thin-walled cavities for casting thin-walled products, such a possibility is high.

Further, the molten metal 10 in the cavity 3 is
Since the plunger tip 5 is not discharged from the cavity 3 after closing the hot water supply port 13, the supply amount of the molten metal 10 is determined by the position of the hot water supply port 13.
It was difficult to finely adjust the supply amount of the molten metal 10 after the vertical injection device 20 was supplied with hot water.

The present invention has been made in consideration of the above points, and it is possible to sufficiently fill the thin metal cavity for casting a thin-walled product with the molten metal and to supply the hot water of the vertical injection device. An object of the present invention is to provide a vertical injection device and a vertical injection method that can finely adjust the supply amount of a molten metal even afterward.

[0014]

According to the present invention, there are provided a mold having a cavity, a vertical injection sleeve communicating with the cavity, a hot water supply opening opened in the vertical injection sleeve, and an upper portion of the hot water supply opening of the vertical injection sleeve. Open hot water recovery port, hot water recovery port opening / closing mechanism with seal plug, hot water pipe communicating with hot water port, plunger tip slidable in vertical injection sleeve, and sliding plunger tip A drive mechanism for driving the hot water supply port and the hot water supply pipe communicating with each other through a recovery connection hole to return the molten metal in the sleeve to the hot water supply pipe, and a heater provided near the recovery connection hole. Is a vertical injection device.

According to the present invention, the hot water supply port is provided above the hot water supply port, and the hot water is filled into the cavity by the pressure applied by the lifting of the plunger tip to reach the hot water supply port. Also, the molten metal can be sufficiently filled. Further, according to the present invention, by returning the molten metal in the sleeve to the hot water supply pipe by the recovery connection hole, it is possible to perform fine adjustment of the supply amount of the molten metal even after the vertical injection device has supplied hot water.

Further, the present invention includes claim 1 in the scope of claims.
In the method for vertically injecting the molten metal by using the vertical injection device described in 1, the step of moving the upper end of the plunger tip to a position lower than the hot water supply port by the drive mechanism, and the vertical injection sleeve from the hot water supply pipe through the hot water supply port The process of supplying the melt above the plunger tip above the cavity volume, the process of raising the plunger chip by the drive mechanism to fill the cavity with the melt in the vertical injection sleeve, and the hot water recovery port to collect the recovery connection hole. Vertical injection method, which comprises a step of returning the excess molten metal to the hot water supply pipe via a step, and a step of further raising the plunger tip by the drive mechanism to increase the pressure of the molten metal filled in the cavity. Is.

According to the present invention, the hot water supply port is provided above the hot water supply port, and the hot water is filled into the cavity by the pressure applied by the rising of the plunger tip to reach the hot water supply port. Also, the molten metal can be sufficiently filled. Further, according to the present invention, by returning the molten metal in the sleeve to the hot water supply pipe by the recovery connection hole, it is possible to perform fine adjustment of the supply amount of the molten metal even after the vertical injection device has supplied hot water.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

1 to 4 are views showing a vertical injection device 30 according to an embodiment of the present invention. As shown in FIGS. 1 to 4, the vertical injection device 30 includes molds 32 a and 32 b that form a cavity 31, and a vertical injection sleeve 33 that communicates with the cavity 31. The mold 32a is a moving mold, and the mold 32b is a fixed mold.

A hot water supply port 34 is opened at the side wall at the bottom of the vertical injection sleeve 33, and a hot water supply pipe 35 is provided at the hot water supply port 34.
Are in communication. As shown in FIG. 1, the other end of the hot water supply pipe 35 communicates with a constant hot water surface holding furnace 50. Around the hot water supply pipe 35, as shown in FIG. 1, FIG. 2 and FIG.
A heater 35h for preventing solidification of the molten metal 10 therein is provided, and further, as shown in FIG. 1, an electromagnetic pump 36 is provided at a substantially middle portion of the hot water supply pipe 35.

On the other hand, as shown in FIGS. 1, 2 and 4,
On the upper side wall of the vertical injection sleeve 33, there is a hot water recovery port 37.
Is opened, and the hot water recovery port 37 has a recovery connection hole 38.
Are in communication. The other end of the recovery connection hole 38 has a hot water supply pipe 35.
It is connected to the.

As shown in FIGS. 1, 2 and 4, the hot water supply recovery port 37 is provided with a seal plug 45 for opening and closing the hot water supply recovery port 37. A seal plug opening / closing actuator 46 is connected to the seal plug 45. The seal plug opening / closing actuator 46 is the fixed die plate 4.
It is located at 7.

In the vicinity of the hot water recovery connection hole 38,
As shown in FIG. 3, two heaters 38h are provided in parallel with the recovery connection hole 38.

Further, as shown in FIG. 1, a plunger tip 40 is provided in the vertical injection sleeve 33 so as to be slidable in the vertical direction, and the plunger tip 40 is driven to slide the plunger tip 40. The cylinder 41 is connected. As shown in FIG. 1, the plunger tip 4
A magnetic scale 42 is attached below 0, and a stroke sensor 43 that detects the stroke of the plunger tip 40 in cooperation with the magnetic scale 42 is attached to the drive cylinder 41.

In addition, as shown in FIG. 1, the constant melt surface holding furnace 50 contains the melt M, and a melt surface detector 51 for detecting a melt surface S of the melt M, and a melt of the melt M. Connected to the immersion body 52, a part of which is immersed on the surface S, elevating means 53 for elevating and lowering the immersion body 52, melt level detector 51 and elevating means 53,
And a control device 54 for controlling the elevating means 53.

Next, the operation of this embodiment having such a configuration will be described with reference to FIGS. 2 and 4.

First, as shown in FIG. 2, the drive cylinder 4
By 1, the upper end of the plunger tip 40 is moved to the lower limit position lower than the hot water supply port 34. On the other hand, the seal plug 45
Is closed by the seal plug opening / closing actuator 46.

Next, the hot water supply pipe 35 is moved by the electromagnetic pump 36.
From above, the molten metal M is supplied above the plunger tip 40 in the vertical injection sleeve 33 through the hot water supply port 34 in an amount larger than the volume of the cavity 31 (see the dotted line in FIG. 2). The molten metal M is supplied until the molten metal surface reaches S ′ shown in FIG.

Then, the plunger tip 40 is raised by the drive cylinder 41 to fill the cavity 31 with the molten metal M supplied into the vertical injection sleeve 33. Molten metal M
Receives pressure from plunger tip 40 and cavity 3
Since it is filled in the cavity 1, even if the cavity 31 is a thin cavity for casting a thin product, the melt M is sufficiently filled in the cavity 31.

When the stroke sensor 43 detects that the plunger tip 40 has reached a position lower by δ than the lower end position of the molten metal recovery port 37, the seal plug 4
5 is opened by the seal plug opening / closing actuator 46, as shown in FIG. Therefore, a part of the molten metal M is returned to the hot water supply pipe 35 by the hot water supply recovery port 37 via the recovery connection hole 38. At this time, the recovery connection hole 38 shown in FIG.
The two heaters 38h in the vicinity of prevent the molten metal from solidifying in the recovery connection hole 38.

Further, the driving cylinder 41 raises the plunger tip 40 to close the hot water supply recovery port 37, and the molten metal M filled in the cavity 31 is solidified under high pressure.

Then, as shown in FIG. 2 again, the drive cylinder 41 moves the upper end of the plunger tip 40 to a lower limit position lower than the hot water supply port 34. The injection molding of the molten metal is repeated by repeating the above steps.

As described above, according to the present embodiment, the molten metal M is filled with pressure from the plunger tip 40 into the cavity 31, so that the cavity 31 is a thin-walled cavity for casting thin-walled products. However, the molten metal M is surely filled in the cavity 31.

Further, according to the present embodiment, a part of the molten metal M is controlled by the opening / closing control of the seal plug 45 so that the hot water recovery port 37
Since it can be returned to the hot water supply pipe 35 through the recovery connection hole 38, the fine adjustment of the supply amount of the molten metal M can be easily performed. In this way, by adjusting the supply amount of the molten metal M and controlling the drive cylinder 41, the cavity 3
The molten metal M can be supplied at an injection speed suitable for the shape of No. 1, and as a result, a good cast product can be obtained.

[0035]

As described above, according to the present invention, the hot water supply port is provided above the hot water supply port, and the hot water is filled in the cavity by the pressing force of the plunger tip rising up to the hot water supply port. The molten metal can be sufficiently filled in the product cavity.

Further, according to the present invention, the molten metal in the sleeve is returned to the hot water supply pipe by the recovery connection hole, so that the amount of the molten metal supplied can be finely adjusted even after the hot water is supplied to the vertical injection device.

[Brief description of drawings]

FIG. 1 is a schematic view showing a vertical injection device according to an embodiment of the present invention.

FIG. 2 is a partially enlarged cross-sectional view of the vertical injection device according to the embodiment of the present invention, showing a case where the upper end of the plunger tip is at the lower limit position.

3 is a sectional view taken along the line AA of FIG.

FIG. 4 is a partially enlarged cross-sectional view of the vertical injection device according to the embodiment of the present invention, showing a case where the upper end of the plunger tip is slightly below the hot water supply recovery port.

FIG. 5 is a schematic view showing a conventional vertical injection device.

[Explanation of symbols]

1 Upper mold 2 Lower mold 3 cavities 4 Plunger sleeve 5 Plunger tip 6 Plunger Road 7 Limit switch 8 protrusions 9 Molten metal holding furnace 10 molten metal 11 Electromagnetic pump 12 Hot water supply pipe 13 Hot water supply port 20 Vertical injection device 30 Vertical injection device 31 cavity 32a moving mold 32b fixed mold 33 Vertical injection sleeve 34 Hot water supply port 35 hot water supply pipe 35h heater 36 Electromagnetic pump 37 Hot water collection port 38 Recovery connection hole 38h heater 40 Plunger tip 41 drive cylinder 42 Magnetic scale 43 Stroke sensor 45 seal plug 46 Seal plug open / close actuator 47 Fixed die plate 50 Fixed surface level holding furnace 51 Level Detector 52 Immersion body 53 Lifting means 54 control device

Claims (2)

[Claims] 1. A mold having a cavity, a vertical injection sleeve communicating with the cavity, a hot water supply opening opened in the vertical injection sleeve, and a hot water supply recovery opening opened above the hot water supply opening of the vertical injection sleeve. An opening / closing mechanism provided in the hot water supply port with a seal plug, a hot water supply pipe communicating with the hot water supply port, a plunger tip slidable in the vertical injection sleeve, and a drive mechanism for slidingly driving the plunger tip. A vertical injection device characterized in that the hot water supply recovery port and the hot water supply pipe are connected by a recovery connection hole to return the molten metal in the sleeve to the hot water supply pipe and a heater is provided in the vicinity of the recovery connection hole. 2. A method for vertically injecting molten metal using the vertical injection device according to claim 1, wherein the drive mechanism moves the upper end of the plunger tip to a position lower than the hot water supply port, and hot water is supplied from the hot water supply pipe. A step of supplying a molten metal to the upper side of the plunger tip in the vertical injection sleeve through the mouth in an amount larger than the cavity volume; and a step of raising the plunger tip by the drive mechanism to fill the molten metal in the vertical injection sleeve into the cavity, It has a step of returning excess molten metal to the hot water supply pipe through the recovery connection hole by the hot water supply recovery port, and a step of further raising the plunger tip by the drive mechanism to pressurize the molten metal filled in the cavity with high pressure. A vertical injection method characterized in that