JP2021084129A - Die cast device - Google Patents

Abstract

To provide a die cast device capable of inhibiting galling from occurring at a sleeve bottom part.SOLUTION: A die cast device includes: a sleeve 10 into which a molten metal is poured; and a plunger 20 for pushing the molten metal poured into the sleeve 10 into a die. The plunger 20 includes: a plunger tip 21 attached to a plunger rod 22; tip rings, each of which is attached to the plunger tip 21 and seals a gap formed between the plunger tip 21 and an inner peripheral surface 10a of the sleeve 10; and a bearing which is attached to the plunger tip 21 and makes rolling contact with the inner peripheral surface 10a of the sleeve 10.SELECTED DRAWING: Figure 1

Description

The present invention relates to a die casting device, and more particularly to a horizontal type die casting device in which a sleeve or a plunger (plunger rod or the like) is arranged in a horizontal direction.

In a horizontal die-casting device in which a sleeve or plunger (plunger rod, etc.) is arranged in the horizontal direction, when the plunger tip slides in the sleeve, the lower part of the plunger tip and the sleeve due to the weight of the plunger itself. It is known that the frictional force generated between the bottoms of the plunger causes uneven wear in which the lower part of the plunger tip is worn more than other parts.

On the other hand, there is known a die casting device configured to suppress uneven wear of the plunger tip by rotating the plunger tip by a preset predetermined angle as the plunger tip moves back and forth in the sleeve. (See, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 6-99263

However, in Patent Document 1, although uneven wear of the plunger tip can be suppressed, when the plunger tip to which the tip ring is attached slides in the sleeve, "galling" (molten metal is formed) on the bottom of the sleeve. In the case of molten aluminum, there is a problem that it is not possible to suppress the generation of linear aluminum marks).

The present invention has been made to solve such a problem, and provides a die casting device capable of suppressing the occurrence of "galling" on the bottom of the sleeve.

The die casting device according to the present invention is a die casting device including a sleeve into which molten metal is poured and a plunger for press-fitting the molten metal poured into the sleeve into a mold. Is a tip ring attached to the plunger rod and attached to the plunger tip to seal a gap between the inner peripheral surface of the sleeve, and a sleeve attached to the plunger tip. It is provided with a bearing that rolls into contact with the inner peripheral surface of the.

With such a configuration, it is possible to suppress the occurrence of "galling" on the bottom of the sleeve.

This is because, firstly, a bearing that receives the weight of the plunger (for example, a linear ball bearing) is attached to the plunger tip so that the weight of the plunger does not (or hardly acts) on the tip ring. Secondly, this causes the tip ring (outer peripheral surface) to press the semi-solidified molten metal that has entered between the sleeve (inner peripheral surface) and the tip ring (outer peripheral surface) against the bottom of the sleeve (inner peripheral surface). This is due to the reduction of the dragging force in the state, that is, the frictional force acting between the tip ring (outer peripheral surface) and the sleeve (inner peripheral surface) (friction force due to the weight of the plunger itself).

According to the present invention, it is possible to suppress the occurrence of "galling" on the bottom of the sleeve.

It is a schematic diagram of the die casting apparatus 1. It is a photograph of the die casting device 1 taken from the direction indicated by the arrow 40 in FIG. It is the schematic sectional drawing of the die casting apparatus 1. FIG. It is the schematic sectional drawing of the die casting apparatus 1. FIG.

Hereinafter, the die casting apparatus 1 according to the embodiment of the present invention will be described with reference to the accompanying drawings. Corresponding components in each figure are designated by the same reference numerals, and duplicate description is omitted.

First, the configuration (outline) of the die casting device 1 according to the present embodiment will be described with reference to FIG.

FIG. 1 is a schematic view of the die casting device 1.

As shown in FIG. 1, the die casting device 1 is a horizontal type die casting device in which a sleeve 10 and a plunger 20 (plunger rod 22 and the like) are arranged in the horizontal direction. In the die casting device 1, the plunger tip 21 to which the tip ring 23 is attached advances in the sleeve 10 toward the mold (not shown), so that the molten metal poured into the sleeve 10 enters the mold. It is press-fitted.

At that time, in the die casting device 1, the plunger tip 21 to which the tip ring 23 is attached advances and retreats in the sleeve 10 and repeats injection, so that the bottom portion of the sleeve 10 (inner peripheral surface 10a) (one point in FIG. 1). Refer to the range surrounded by the rectangle A1 of the chain line. Hereinafter, it is referred to as the bottom A1), and "galling" occurs.

Next, with reference to FIG. 2, the details of the “galling” generated on the bottom A1 of the sleeve 10 will be described.

FIG. 2 is a photograph of the die casting device 1 taken from the direction indicated by the arrow 40 in FIG. In FIG. 2, the member indicated by reference numeral 10 is a sleeve, the member indicated by reference numeral 21 is a plunger tip, the member indicated by reference numeral 23 is a chip ring, and the member indicated by reference numeral 30 is connected to the injection port of the sleeve 10. It is a mold that has been made. A plurality of white streaks 11 extending radially in the range surrounded by the rectangular chain A2 of the alternate long and short dash line in FIG. 2 are “scratches” generated on the bottom A1 of the sleeve 10. In FIG. 1, the "kajiri" extends in the left-right direction.

“Kajiri” means that when the plunger tip 21 to which the tip ring 23 is attached moves back and forth in the sleeve 10 and repeats injection, it is between the tip ring 23 (outer peripheral surface 23a) and the sleeve 10 (inner peripheral surface 10a). It is a scratch generated on the bottom A1 (see FIG. 1) of the sleeve 10 (inner peripheral surface 10a) due to the invading semi-solidified molten metal. Specifically, when the molten metal is a molten aluminum, the "kajiri" is a linear aluminum mark.

When "galling" occurs, the smooth injection of the molten metal is hindered, so that the life of the sleeve 10 is shortened, which causes an increase in cost. In addition, when "galling" occurs, the behavior of the molten metal becomes unstable, which causes deterioration in the quality of the molded product (cast product). The die casting device 1 of the present embodiment is intended to suppress the occurrence of this "galling" on the bottom A1 of the sleeve 10.

The causes of "galling" on the bottom A1 of the sleeve 10 are as follows.

That is, when the molten metal poured into the sleeve 10 is press-fitted into the mold, the tip ring 23 attached to the plunger tip 21 slides with respect to the sleeve 10. At that time, the weight of the plunger 20 (and the force that the tip ring 23 expands and tries to seal) acts on the tip ring 23 (see the arrow 41 in FIG. 3), which is caused by the weight of the plunger 20. Then, a frictional force acts between the tip ring 23 (outer peripheral surface 23a) and the sleeve 10 (inner peripheral surface 10a). Due to this frictional force, the semi-solidified molten metal that has entered between the tip ring 23 (outer peripheral surface 23a) and the sleeve 10 (inner peripheral surface 10a) is strongly pressed against the bottom A1 of the sleeve 10 (inner peripheral surface 10a). Dragged. As a result, "galling" occurs on the bottom A1 of the sleeve 10 (inner peripheral surface 10a).

Next, the configuration (details) of the die casting device 1 according to the present embodiment will be described with reference to FIG.

As shown in FIG. 1, the die casting device 1 includes a sleeve 10 into which the molten metal is poured, and a plunger 20 for press-fitting the molten metal poured into the sleeve 10 into a mold. Further, although not shown, the die casting device 1 is an injection cylinder for advancing and retreating the plunger rod 22 (and the plunger tip 21 attached to the die casting device 21), fixed and movable, like a general horizontal type die casting device. It is provided with a mold clamping part for opening and closing the two molds, an extrusion part for extruding a molded product from the mold, and the like.

As shown in FIG. 1, the plunger 20 includes a plunger tip 21 and a plunger rod 22. The plunger tip 21 is attached to the tip of the plunger rod 22. The plunger rod 22 is connected to an injection cylinder (not shown).

FIG. 3 is a schematic cross-sectional view of the die casting device 1.

As shown in FIGS. 1 and 3, a tip ring 23 is attached to the plunger tip 21 in order to seal a gap between the plunger tip 21 and the sleeve 10 (inner peripheral surface 10a).

The tip ring 23 is not a perfect ring, but a C-shaped ring having both ends facing each other with a gap S (see FIG. 3) in between. The tip ring 23 is attached in a state of being fixed to the plunger tip 21, for example, by fitting the plunger tip 21 into the tip ring 23. A plurality of tip rings 23 are attached to the plunger tip 21 in order to increase the sealing force (see FIG. 1).

FIG. 4 is a schematic cross-sectional view of the die casting device 1.

As shown in FIGS. 1 and 4, a bearing 24 is attached to the plunger tip 21 in order to receive the weight of the plunger 20. The bearing 24 is, for example, a linear ball bearing.

The bearing 24 is attached to the plunger rod 22 side with respect to the tip ring 23.

The bearing 24 is attached in a state of being fixed to the plunger tip 21 by, for example, fitting the plunger tip 21 into the bearing 24.

As shown in FIG. 1, the plunger tip 21 to which the tip ring 23 and the bearing 24 are attached as described above is fitted into the sleeve 10. At that time, the rolling element 24a (sphere) constituting the bearing 24 is in contact (rolling contact) with the inner peripheral surface 10a of the sleeve 10 with the plunger tip 21 fitted in the sleeve 10.

Further, since the diameter of the tip ring 23 is larger than the inner diameter of the sleeve 10 (before the plunger tip 21 is fitted into the sleeve 10), the tip ring 23 is in a state where the plunger tip 21 is fitted into the sleeve 10. Elastically deforms. The outer peripheral surface 23a of the tip ring 23 is in contact with the sleeve 10 (inner peripheral surface 10a) due to the elastic force that tries to return to the shape before the elastic deformation. As a result, the gap between the sleeve 10 and the sleeve 10 is sealed.

As shown in FIG. 4, the elastic force for returning to the shape before the elastic deformation (see the arrow 42 in FIG. 4) works evenly in the circumferential direction of the tip ring 23.

Next, an example of the operation of the die casting device 1 having the above configuration will be described.

When the molten metal poured into the sleeve 10 is press-fitted into the mold, the plunger tip 21 is formed in the sleeve 10 while the bearing 24 (rolling body 24a) is in rolling contact with the sleeve 10 (inner peripheral surface 10a). (See arrow 43 in FIG. 1). At that time, the tip ring 23 is in a state where the gap between the tip ring 23 and the sleeve 10 (inner peripheral surface 10a) is sealed by an elastic force (see arrow 42 in FIG. 4) that tries to return to the shape before elastic deformation. While sliding with respect to the inner peripheral surface 10a), the sleeve 10 advances toward the mold together with the plunger tip 21 (and the bearing 24) (see arrow 43 in FIG. 1). At that time, since the bearing 24 receives the weight of the plunger 20, the frictional force (friction force due to the weight of the plunger 20) is generated between the tip ring 23 (outer peripheral surface 23a) and the sleeve 10 (inner peripheral surface 10a). Does not work (or hardly works).

Therefore, even if the semi-solidified molten metal invades between the tip ring 23 (outer peripheral surface 23a) and the sleeve 10 (inner peripheral surface 10a), the invaded semi-solidified molten metal is strongly pressed against the bottom A1 of the sleeve 10. It is suppressed from being dragged in the state. As a result, it is possible to prevent "galling" from occurring on the bottom A1 of the sleeve 10 (inner peripheral surface 10a).

As described above, according to the die casting device 1 according to the present embodiment, it is possible to suppress the occurrence of "galling" on the bottom portion A1 of the sleeve 10 (inner peripheral surface 10a).

First, the bearing 24 that receives the weight of the plunger 20 is attached to the plunger tip 21 so that the weight of the plunger 20 does not act (or hardly acts) on the tip ring 23. 2. As a result, the tip ring 23 (outer peripheral surface 23a) penetrates between the sleeve 10 (inner peripheral surface 10a) and the tip ring 23 (outer peripheral surface 23a), and the semi-solidified molten metal is transferred to the sleeve 10 (inner peripheral surface). The force that drags the tip ring 23 (outer peripheral surface 23a) and the sleeve 10 (inner peripheral surface 10a) while being pressed against the bottom A1 of 10a) (the frictional force caused by the weight of the plunger 20). ) Has been reduced.

All the numerical values shown in the above embodiments are examples, and it goes without saying that an appropriate numerical value different from this can be used.

The above embodiments are merely exemplary in all respects. The present invention is not limitedly construed by the description of the above embodiment. The present invention can be practiced in various other forms without departing from its spirit or key features.

1 Die casting device 10 Sleeve 10a Inner peripheral surface 11 White streaks (scratch)
20 Plunger 21 Plunger Tip 22 Plunger Rod 23 Tip Ring 23a Outer Peripheral Surface 24 Bearing 24a Rolling Body A1 Bottom S Gap

Claims (1)

A die casting device including a sleeve into which molten metal is poured and a plunger for press-fitting the molten metal poured into the sleeve into a mold.
The plunger is attached to the plunger tip attached to the plunger rod, a tip ring attached to the plunger tip to seal a gap between the inner peripheral surface of the sleeve, and the plunger tip. A die casting device including a bearing that rolls into contact with the inner peripheral surface of the sleeve.

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