JPH0615433A - Punch for pressurization in pressurizing casting apparatus - Google Patents

Abstract

PURPOSE:To make coating of lubricator on a punch unnecessary by filling solid lubricator between a cylindrical body end surface fitted to the out of a punch body so as to be slidable and a pressurizing part end surface of the punch body and forming this apparatus to a constitution for working the lubricator at the time of pressurizing. CONSTITUTION:By pushing the punch 3 for pressurizing with a hydraulic cylinder 4, molten metal A in a pressurizing chamber 2 is pressurized and extruded into a mold. The other end surface 5c of the pressurizing part 5a in the punch body 5 is inclined in tapered shape. The solid lubricator is filled between the one end surface 6a of the cylindrical body 6 fitted to the out of the bar-like part 5b in the punch body 5 so as to be slidable and the other end surface 5c in the punch body 5. As there is a gap delta between a hole part 5d in the punch body 5 and a connecting pin 7, at the time of projecting the cylinder device 4, at first, a rod part 4a is abutted on the end part 6b of the cylindrical body 6 and the cylindrical body 6 is pushed to the pressurizing chamber 2 side. Pressurizing force is acted on the solid lubricator B and this lubricator serves as the lubrication and the sealing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure punch in a pressure casting device.

[0002]

2. Description of the Related Art Generally, a pressure casting apparatus is used when producing a casting such as an aluminum alloy or a magnesium alloy or a metal matrix composite material.

By the way, conventionally, in this type of pressure casting apparatus, a sleeve having a pressure chamber for pressurizing and supplying molten metal into a mold and a sleeve are slidably inserted into the pressure chamber. The press punch and the hydraulic cylinder for pushing and pulling the press punch were provided.

When performing pressure casting, after the molten metal is filled in the pressure chamber in which the pressure punch is inserted, the pressure punch is pushed by the hydraulic cylinder to add the molten metal in the pressure chamber into the mold. Pressure was supplied to produce a casting having a predetermined shape.

In the pressure casting work, in order to prevent seizure with molten metal, lubricity with the wall surface of the pressure chamber, and sealability, the pressure punch is made of molybdenum disulfide or the like. Lubricant was applied.

[0006]

However, as described above, there is a problem in that the work of applying a lubricant such as molybdenum disulfide to the press punch at each press is very troublesome.

Therefore, an object of the present invention is to provide a press punch in a press casting apparatus which can solve the above problems.

[0008]

In order to solve the above-mentioned problems, the press punch in the press casting apparatus of the present invention is slidably inserted into the pressurizing chamber of the molten metal communicated with the mold. A punch body for pressing, wherein a pressurizing portion that slides on the wall surface of the pressurizing chamber is formed at one end, and the other end side is a rod-shaped portion having a smaller diameter than the pressurizing portion, and the rod-shaped portion of the punch main body It is composed of a tubular body that is slidably fitted,
Further, a solid lubricant is filled between the other end surface of the pressurizing portion and one end surface of the tubular body, and when the pressurizing is performed, the punch body is pushed through the tubular body, and the punch body is When pulling, the other end of the punch body is pulled.

[0009]

According to the above construction, the press punch for pressurizing the molten metal in the press chamber is composed of the punch main body and the cylindrical body fitted on the punch main body, and the punch main body is pressed. Between the end surface of the pressure portion and the end surface of the tubular body, a solid lubricant is filled, and since the lubricant is pressurized at the time of pressurization, the solid lubricant is pressed against the inner wall surface of the pressure chamber, The role of preventing seizure of molten metal, lubrication with the inner wall surface of the pressure chamber, and sealing are exerted.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A pressure punch according to an embodiment of the present invention will be described below with reference to FIG. In FIG. 1, reference numeral 1 denotes a sleeve in which, for example, a cylindrical pressurizing chamber 2 that communicates with a mold (not shown) is formed. Inside the pressurizing chamber 2, the molten metal A filled therein is A press punch 3 for pressurizing and pushing into the mold is inserted by a cylinder device (hydraulic cylinder) 4 so as to be able to push and pull.

The pressing punch 3 has a pressing chamber 2 at one end.
The punch body 5 is formed with a pressing portion 5a that slides on the inner wall surface 2a of the punch, and the other end side is a rod portion 5b having a smaller diameter than the pressing portion 5a, and the rod portion 5b of the punch body 5 is slidable. And a tubular body 6 fitted on the outside.

The other end surface 5 of the pressing portion 5a of the punch body 5
c is tapered so that the diameter becomes smaller toward the other end. Further, the connection with the cylinder device 4 for pushing and pulling the pressing punch 3 is performed by connecting the pin 7 provided on the rod portion 4a of the cylinder device 4 to the hole 5d formed on the other end side of the punch body 5. It is done by being inserted.

A solid lubricant, for example, graphite powder B, is filled between the other end surface 5c of the pressing portion 5a and the one end surface 6a of the cylindrical body 6. Further, the length of the tubular body 6 is such that the other end surface 6b of the tubular body 6 in the state where the graphite powder B is filled between the pressing portion 5a and the tubular body 6.
Has a length such that it is separated from the tip surface 4b of the rod portion 4a of the cylinder device 4 by a small distance s.

Furthermore, in the above state, the gap δ between the connecting pin 7 and the hole 5d at the other end of the punch body 5 is larger than the distance s. That is,
When the rod portion 4a is projected, the tubular body 6 is first pushed out before the punch body 5 is pushed.

Therefore, in the case of performing pressure casting with the above configuration, the molten metal A is filled in the pressure chamber 2 and the rod portion 4a of the cylinder device 4 is projected. Then,
First, the rod portion 4a contacts the other end surface 6b of the tubular body 6,
The tubular body 6 is pushed to the pressure chamber 2 side. Therefore, the tubular body 6
The punch body 5 is extruded into the pressurizing chamber 2 via the graphite powder B filled between the one end surface 6a of the pressurizing member 5a and the other end surface 5c of the pressurizing portion 5a.

At the time of this extrusion, since the pressing force acts on the graphite powder B itself as it is, the graphite powder B is pressed against the inner wall surface 2a of the pressurizing chamber 2 to prevent the seizure of the molten metal and the inner wall surface 2a. It will serve to lubricate and seal with.

On the other hand, when pulling out the punch main body 5 from the pressurizing chamber 2, the rod portion 4a of the cylinder device 4 is retracted and the connecting pin 7 is pulled, so that the punch main body 5 is removed through the hole 5d. The tubular body 6 is also pulled to the other end side via the graphite powder B through the graphite powder B.

At this time as well, since the graphite powder B is pressurized, it plays the role of lubrication and sealing with the inner wall surface 2a as in the above. Further, since graphite powder is used as the lubricant, even if the inner wall surface 2a of the pressurizing chamber 2 has scratches or irregularities, reliable sealing can be performed and it can be repeatedly used as a seal material. can do.

Therefore, as in the conventional case, at each pressurization,
There is no need to apply a lubricant such as molybdenum disulfide to the pressure punch. Although graphite powder was used as the solid lubricant in the above-mentioned examples, the lubricant is not limited to this.

[0020]

As described above, according to the structure of the present invention, the press punch for pressurizing the molten metal in the pressurizing chamber is composed of the punch main body and the cylindrical body fitted on the punch main body. At the same time, a solid lubricant is filled between the end surface of the pressing portion and the end surface of the cylindrical body of the punch main body, and this lubricant is also pressurized at the time of pressurization. When pressed against the inner wall surface of the pressurizing chamber, the function of preventing seizure of the molten metal, lubricating and sealing with the inner wall surface of the pressurizing chamber is exerted, and thus it is not necessary to apply a lubricant to the pressurizing punch as in the conventional case.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a main part of a pressure punch according to an embodiment of the present invention.

[Explanation of symbols]

 A Molten metal B Graphite powder 2 Pressurizing chamber 2a Inner wall surface 3 Pressing punch 4 Cylinder device 5 Punch body 5a Pressing part 5b Rod-like part 5c Other end face 6 Cylindrical body 6a One end face

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yuzuru Kobayashi 5-3-3 Nishikujo 5-chome, Konohana-ku, Osaka City, Osaka Prefecture Hitachi Zosen Corporation

Claims (1)

[Claims] 1. A press punch slidably inserted into a pressurizing chamber of molten metal communicated with a mold, wherein a pressurizing portion that slides on a wall surface of the pressurizing chamber is formed at one end. Along with the punch body, the other end is formed into a rod-shaped portion having a diameter smaller than that of the pressing portion,
The punch body is composed of a tubular body slidably fitted on the rod-shaped portion, and a solid lubricant is filled between the other end surface of the pressing portion and one end surface of the tubular body. In addition, when the punch body is pushed, the punch body is pushed through the tubular body at the time of pressurization, and when the punch body is pulled, the other end side of the punch body is pulled. Press punch.