JPH0466254A - Die casting injection device - Google Patents

Abstract

PURPOSE:To uniformly spread lubricating oil and to achieve stability of injection condition by forming an inclined spiral groove to outer diameter of an injection tip. CONSTITUTION:Casting with die casting is executed with mechanism constituted with a sleeve 4 as molten metal supplying hole for pressing the molten metal into a die 5, the injection tip 3 for pressing the molten metal in the die 5, an injection cylinder 1 for working the injection tip 3, a runner gate 6 to injection of the molten metal at high velocity and a pressure increasing cylinder for executing increased pressure injection. The molten metal in the sleeve 4 is injected to high accurate quality with a tip injection device having the inclined spiral groove 9 under extremely reducing condition of friction with the sleeve 4 and uniformized injection condition. By this method, as the casting in the die casting can be executed under stable injection condition, the stable quality is obtd. Further, the lubricating oil is uniformly spread and extension of the service life to the tip is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a suitable mechanism for obtaining stable injection conditions when press-fitting molten metal into a mold in die casting.

[Conventional technology]

Conventionally, injection tips have been used with the thermally sprayed outer diameter polished, but Japanese Patent Laid-Open No. 56-99062 discloses a method in which a combustible material such as paper is attached to the inner surface of an injection sleeve to act as a solid lubricant. A method is disclosed.

[Problem to be solved by the invention]

In die casting, instability of injection conditions causes variations in quality and reduces stability. This is because even if the settings for low speed and high speed on the die casting machine are correct, the injection speed will differ due to friction between the sleeve and the injection tip, and the expected conditions will not be obtained. Furthermore, the process using paper or the like is complicated.

An object of the present invention is to provide a die casting injection device that satisfies a stable injection speed when the molten metal in the sleeve is press-fitted into the mold by the injection tip.

[Means to solve the problem]

In order to achieve the above object, the present invention provides an inclined helical groove on the outside diameter of the injection tip, thereby allowing lubricating oil to spread uniformly and stabilizing injection conditions.

[Effect]

The stabilization of injection conditions is achieved by uniformly spreading the lubricating oil through the molten metal in the sleeve into the inclined spiral groove, which reduces the friction between the sleeve and the injection tip. This prevents the injection conditions from malfunctioning.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

Die casting involves a sleeve 4 that serves as a feed port for press-fitting the molten metal into the mold 5, an injection tip 3 that presses the molten metal into the mold 5, an injection cylinder 1 that operates the injection tip 3, and a cylinder 1 that operates the injection tip 3 until the molten metal is injected at high speed. This is carried out by a mechanism consisting of a runner gate 6 and a pressure increase cylinder that performs pressure increase injection.

A feature of the present invention is that the molten metal in the sleeve 4 is
With the chip injection device having the following, the quality can be made highly accurate under uniform injection conditions with extremely reduced friction with the sleeve 4.

The helical groove 9 may be one continuous groove or a plurality of closed grooves. The grooves may intersect with each other, and are provided so as not to penetrate the tip and end of the tip for extruding the molten metal. Prevent lubricant from leaking to the tips and ends.

The width and depth of the groove may be such that the lubricating oil can properly penetrate and be retained, and the groove is formed with a depth and width larger than the surface roughness of the finished surface of the chip.

〔Effect of the invention〕

According to the present invention, since die casting can be performed under stable injection conditions, stable quality can be obtained. Furthermore, by determining the depth of the inclined spiral groove, the degree of wear of the injection tip can be determined, and at the same time, the lubricating oil is evenly distributed, which has the effect of extending the life of the tip.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a die-casting injection mechanism according to an embodiment of the present invention, and FIG. 2 is a detailed diagram of the section (■) in FIG. 1. 1... Injection cylinder, 2... Die-casting, 3...
... Inclined helical injection tip, 4... Sleeve, 5...
・Mold, 6...Runner gate, 7...Lubricating oil inlet, 8...Pouring port, 9...Spiral groove.

Claims (1)

[Claims] 1. In a die casting injection device for die casting, in which molten metal poured into a sleeve is press-fitted into a mold by an injection tip into a mold using an injection cylinder, lubricating oil is provided on the outer diameter of the injection tip. A die-casting injection device characterized by having a groove capable of holding.