JP3042341U - Split type piston - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To provide a piston which is easy to assemble and has strength in manufacturing a piston part of a die casting machine. SOLUTION: Up to now, what has been manufactured as an integrated type is divided into three parts, that is, a piston body 1a, a piston groove protruding flange 1b, and a piston groove protruding flange 1c, and the piston ring 2 is fitted. Assemble with piston assembly bolt 1d and nut 1e.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a piston part of a magnesium die casting machine, and more particularly to a piston and a piston ring.

[0002]

[Prior art]

 Conventionally, as a piston of this type, a conventional piston 1 of a magnesium die casting machine shown in FIG. 3 has a piston ring 2 fitted on a cylindrical piston of an integral body. A piston ring receiving groove A is cut out by a lathe or the like, and a special tool Then, the sleeve 2b of the piston ring 2 was expanded and fitted into the conventional piston 1.

[0003]

[Problems to be solved by the device]

 When the piston ring 2 is fitted into the conventional piston 1, the outer diameter of the conventional piston 1 is larger than the inner diameter of the piston ring 2. Therefore, the piston ring sleeve 2b should be expanded with a special tool. Open to C and increase the inner diameter of the piston ring 2 to fit it in the conventional piston 1. This work is inefficient, and the piston ring 2 is made of quenched special steel and the piston There was a problem that the widened ring width 2a could not be used.

For the work in the die casting machine, it is of the utmost importance to guide the molten metal 5 to the molten metal outlet 6 mechanically by vertically moving the piston 1 and applying a pressure action.

At present, the magnesium die casting machine operates at high pressure and high temperature (600 ° C. to 700 ° C.) because the melting temperature of magnesium is as high as 650 ° C. due to its nature.

However, due to the fact that the wide piston ring width 2a cannot be used for the above reason, the piston ring receiving groove A inevitably becomes shallow, and the shallow groove means that the piston 1 is the piston. The strength itself that receives the ring 2 becomes weaker, the piston ring receiving groove A is destroyed by repeated work of high temperature and high pressure, and the piston ring 2 is sandwiched between the piston 1 and the plunger 3 that functions as a cylinder, causing a galling phenomenon. There was also a problem that a large loss would occur due to machine stoppages, plunge 3 repairs, etc.

The present invention has been made in view of the above problems of the prior art. The purpose of the present invention is to easily fit the piston ring in the piston, and to reduce the piston ring width. The purpose is to provide a piston that can be used in a wide range and has excellent strength.

[0008]

[Means for Solving the Problems]

 In order to achieve the above object, the piston according to the present invention has a piston body divided into three parts, and two types of flanges with split piston grooves are fitted with respective piston rings. Assemble to, and tighten the piston assembly bolt and nut.

Since the piston ring can be easily inserted into the split type piston grooved flange, the assembly time can be shortened, and the assembly can be easily performed and the piston ring width can be freely set.

The fact that a wide piston ring can be used makes it possible to make the piston ring receiving groove large, so that the strength of the piston is increased and the piston ring receiving groove is not broken and the galling phenomenon is eliminated.

[0011]

[Embodiment of the invention]

 Embodiments of the invention will be described with reference to the drawings. In FIG. 2, the conventional piston 1 is divided into a split type piston body A1a, a split type piston grooved flange B1b, and a split type piston grooved flange C1c into two bodies. After fitting in the groove portions of the flanges 1b to 1c, assembling as shown in the figure, the piston assembly bolt 1d is put through the center of the assembled split type pistons 1a to 1c, and fixed with the nut 1e.

The reason why the conventional piston 1 is divided into three parts and assembled is to prevent the galling phenomenon as described above.

The cause of the galling phenomenon is that when the piston ring 2 is fitted into the conventional piston 1 as shown in FIG. 3, the outer diameter of the conventional piston 1 is larger than the inner diameter of the piston ring 2, so that a special machine is used. Push the groove of the piston ring sleeve 2b to the left and right with a tool to open it and insert it into the conventional piston 1. The piston ring 2 is hardened and hardened due to its nature and uses steel material. Therefore, it cannot be fitted into the conventional piston 1.

Further, as shown in FIG. 4, the piston ring width 2a cannot be increased in order to push the piston ring 2 to the left and right. This leads to breakage of the tip of the special tool, which means that the piston ring receiving groove A of the conventional piston 1 becomes shallow, and the strength of the piston ring receiving groove A of the conventional piston 1 is inevitably low.

When the strength becomes low, the piston ring receiving groove A of the conventional piston 1 becomes incapable of withstanding the repeated motion which is the motion function of the piston and is destroyed as shown in FIG. 5, and the conventional piston 1 and the plunger 3 are destroyed. The piston ring 2 was sandwiched between them, causing a galling phenomenon.

Therefore, the piston body 2 is divided into three parts, and the piston ring 2 is easily fitted to the split type piston grooved flanges 1b to 1c without opening the piston ring 2 left and right, and the thickness of the piston ring width 2a is reduced. The piston ring receiving groove B can be made larger by making it larger, which greatly improves the strength of the piston and eliminates the galling phenomenon.

[0017]

[Effect of the invention]

 Since the present invention is configured as described above, it has the following effects.

According to the split type piston of the first aspect, the assembly is easy, the piston ring can be easily fitted to the piston, and the piston can have strength.

[Brief description of the drawings]

FIG. 1 is a sectional view for explaining a piston operation of a die casting machine.

FIG. 2 is an assembled sectional view of a split type piston.

FIG. 3 is a perspective view showing a state where a piston ring is fitted to a conventional integrated piston.

FIG. 4 is a perspective view of a piston ring.

FIG. 5 is a cross-sectional view showing a galling phenomenon of a piston ring.

[Explanation of symbols]

 1 Conventional Piston 1a Split Piston Body A 1b Split Piston Groove Flange B 1c Split Piston Groove Flange C 1d Piston Assembly Bolt 1e Nut 2 Piston Ring 2a Piston Ring Width 2b Piston Ring Slewiwa 3 Plunger 4 Connecting Rod 5 Molten Metal 6 Molten metal outlet direction 7 Molten metal interface 8 Piston operating direction A Piston ring receiving groove B Piston ring fitting direction C Piston ring inner diameter expanding direction

Claims (1)

[Utility model registration claims] 1. In a magnesium die casting machine, a conventional piston (1) for extruding molten metal (5) is used as a split type piston, and the piston body is divided into three parts, with a split type piston body (1a) and a split type piston groove. Flange (1b), split type piston grooved flange (1c)
A split type piston in which the piston ring (2) can be easily fitted by assembling the split type piston parts and tightening them with bolts (1d) and nuts (1e).