WO2020022304A1

WO2020022304A1 - Back-spray system and injection piston

Info

Publication number: WO2020022304A1
Application number: PCT/JP2019/028761
Authority: WO
Inventors: ロビンボーガン
Original assignee: 株式会社Moresco
Priority date: 2018-07-26
Filing date: 2019-07-23
Publication date: 2020-01-30
Also published as: EP3827914A1; MX2021000911A; JP6852227B2; US20210162492A1; EP3827914A4; JPWO2020022304A1

Abstract

Provided is a back-spray system comprising an injection piston that has a plunger tip (26) and an ejector rod (24). An ejector rod hole (32) that connects a lubricant supply part and an annular part (30) positioned behind the plunger tip (24) is formed along the entire length of the ejector rod (24). A prescribed number of annular part holes (40) are formed, in the annular part (30), along the circumference of the annular part (30). The annular part holes (40) are of a size and arrangement enabling the distribution of an accurate and uniform quantity of the lubricant into a space between the plunger tip (24) and an ejector sleeve (20). A flow path having two drill holes (38) connecting to the ejector rod hole (40) is formed below the annular part (30).

Description

Back spray system and injection piston

The present invention relates to a back spray system used for an injection piston used in a die casting device. More specifically, the present invention encompasses a system for lubricating the interior of the die casting sleeve and the plunger tip between the mold and the inlet.

In die casting, molten metal such as aluminum is injected into the injection sleeve from the injection port of the injection sleeve. A predetermined amount of molten metal is transferred by an injection piston to an injection sleeve for insertion into a mold cavity to form a casting, the metal is cooled, and the casting is removed from the mold. The injection piston comprises an injection rod and a plunger tip and "injects" the molten metal into the mold cavity by moving axially or extending into the injection sleeve. Molten metal exists on the plunger tip and injection rod, and friction occurs between the plunger tip and the injection sleeve, and the plunger tip and the injection rod become hot. is necessary.

Injection systems tend to have many different problems. Excessive wear and inadequate lubrication are often associated with an enlarged plunger tip and injection sleeve, as well as dripping and wasting lubricant used to minimize wear. Occurs. Applying lubricant to these contact surfaces has heretofore been a disadvantage of inefficiency, and the lubricating tubes and holes result in excessive wear and component fatigue. Cleaning the lubrication holes and outlets continues to be difficult and time consuming, and can also be used when lubricant application is excessive or inappropriate. Presents the problem of generating smoke during the die casting operation.

Various application systems have been developed in an attempt to overcome problems in lubricant application. However, it is difficult to spread the lubricant around the peripheral surface from the gap between the end surface of the injection sleeve and the end surface of the injection piston. Deposits and the like are generated.

An object of one embodiment of the present invention is to provide a system or the like that can allow a lubricant to reach an appropriate position in an injection sleeve.

A back spray system according to one aspect of the present invention is a back spray system for applying a lubricant to an injection sleeve of a die casting apparatus, comprising: an injection sleeve, an injection piston having a plunger tip and an injection rod connected thereto. A groove surrounding the injection rod, and an annular portion covering the groove. The injection rod has an injection rod hole formed over the entire length of the injection rod, and the groove has the injection rod hole. And a predetermined number of annular holes communicating with the groove are formed in the annular portion along the circumference of the annular portion. The lubricant that has flowed into the groove from the groove hole, and from the groove through the annular hole, between the plunger tip and the injection sleeve It is released during.

An injection piston according to one aspect of the present invention is an injection piston used in combination with an injection sleeve, and formed to surround a plunger tip, an injection rod connected to the plunger tip, and the injection rod. A groove portion, and an annular portion covering the groove portion, wherein the injection rod has an injection rod hole formed over the entire length of the injection rod, and the groove portion is connected to the injection rod hole. A predetermined number of annular holes communicating with the groove are formed along the circumference of the annular portion, and the lubricant supplied to the injection rod hole is formed in the annular portion. Flows into the groove from the groove hole, and is discharged from the groove through the annular hole to the space between the plunger tip and the injection sleeve.

潤滑 Lubricant can reach the appropriate position in the injection sleeve.

It is a figure showing a general die casting device. It is a side view of the conventional injection sleeve, and shows the state where the injection plunger is in the pulled-out position. 1 is a side view of an injection piston according to one embodiment of the present invention, showing a plunger tip and an injection rod. It is a side view of the above-mentioned injection piston, and has shown the state where an annular part is arranged so that a slot may be covered. FIG. 5 is a sectional view taken along line AA of the injection piston shown in FIG. 4.

The invention is described in general terms. The brief description of the drawings referred to the accompanying drawings. The drawings are not necessarily to scale.

Hereinafter, the present invention will be described more fully with reference to the accompanying drawings. In this description, a preferred embodiment of the present invention will be described. However, the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. These embodiments are for the purpose of making the present disclosure consistent and complete, and will allow those skilled in the art to become fully aware of the scope of the invention. Throughout this disclosure, each component is referred to by like numbers.

〔Overview〕
It is a general object of at least one embodiment of the present invention to provide a lubricant application system that applies lubricant as far forward as possible within an injection sleeve. Another object is to spray the lubricant sufficiently to cover the entire inner surface of the injection sleeve from the mold to the injection section.

A backspray system with an injection piston having a plunger tip and an injection rod is provided. The injection rod is provided with a gun drill through the entire length of the injection rod, the hole connecting the lubricant supply portion and the annular portion located behind the plunger tip.

所定 A predetermined number of holes or openings are arranged along the circumference of the annular portion. The hole or opening is sized and arranged to distribute a precise and uniform amount of lubricant and air to the space between the plunger tip and the injection sleeve. The number of holes shall correspond to the circumference of the injection rod. A flow path is formed below the annular portion. The channel is provided with two drill holes that connect to the injection rod holes that extend the entire length of the injection rod.

During use of the injection piston, a mixture of lubricant and air is carried from the injection rod bore to the annulus, where the mixture is expelled or sprayed to completely cover the injection sleeve and the plunger tip, and the Apply the lubricant well forward.

Other objects, features, and advantages of the present invention will become apparent to those skilled in the art from the following detailed description based on the drawings.

[Configuration of die casting device]
Reference is now made to FIG. FIG. 1 shows a simplified view of a die casting apparatus 10. The die casting device 10 includes a frame 12. The frame 12 includes a fixed mold 14 and a movable mold 16 mounted on the frame 12. The movable mold 16 functions as a second mold which is driven toward and away from the fixed mold 14 by a reciprocating mechanism (not shown). When the movable mold 16 comes into contact with the fixed mold 14, a cavity 18 is formed therebetween. The injection sleeve 20 communicates with the cavity 18 through the fixed mold 12. In the injection sleeve 20 there is an injection piston 23 with a plunger tip 26 and an injection rod 24. The injection rod 24 is slidably disposed within the injection sleeve 20 and moves back and forth within the injection sleeve 20. The injection sleeve 20 is a symmetrical circular metal sleeve in which the injection rod 24 slides. After the molten metal is injected from the injection hole (opening) 22, the injection rod 24 pushes the molten metal into the cavity 18 of the mold. The injection hole 22 is located at an end of the injection sleeve 20 far from the mold. The injection hole 22 is located above the injection sleeve 20 so that molten metal can be poured into the injection sleeve 20. Molten metal is injected into the injection sleeve 20 when the injection piston 23 is in the withdrawn position.

FIG. 2 shows a conventional injection sleeve 20. In FIG. 2, the injection piston 23 having the plunger tip 26 and the injection rod 24 is in the extended position. In FIG. 2, the injection piston 23 waits for the injection of molten metal such as aluminum into the injection sleeve 20 through the injection hole 22. As the injection piston 23 is pushed toward the mold, a narrow space 25 is created between the surface of the plunger tip 26 and the inside of the injection sleeve 20. The space 25 varies depending on the inner diameter of the injection sleeve 20 and the outer diameter of the plunger tip 26, but is generally about 0.03 to 0.06 mm. This narrow gap results in excessive wear due to poor lubricant.

[Description of back spray system]
The above problem with lubricants is solved by a back spray system with an injection piston 23 shown in FIGS. 3 and 4, according to one embodiment of the present invention. The injection piston 23 of the back spray system includes an injection rod 24 having an annular portion 30 at a front end. The configuration other than the injection piston 23 in the back spray system is the same as that of the conventional die casting apparatus 10 as shown in FIGS.

The back spray system applies a lubricant so as to cover the entire inner surface of the injection sleeve 20 when the plunger tip 26 is pushed into the injection sleeve 20 and pulled out. As the lubricant, any conventional lubricating oil can be used. An injection rod hole 32 is formed in the injection rod 24 over the entire length of the injection rod 24 to reach just before the front end of the injection rod 24 so that the lubricant can reach an appropriate place. . The size of the injection rod hole 32 varies depending on the size of the injection sleeve 20 and the injection piston 23 and the amount of lubricant used. Typically, the diameter of the injection rod hole 32 is between about 6.5 mm and 19.05 mm (about 1/4 inch to 3/4 inch). The lubricant is supplied from the rear end of the injection rod 24 under pressure by equipment known to those skilled in the art.

The plunger tip 26 is connected to the end of the injection rod 24 by, for example, providing a screw thread 34 and screw-connecting. A recessed groove 36 is provided behind the plunger tip 26. In the examples of FIGS. 3 and 4, the distal end of the injection rod 24 is reduced in diameter, and the groove 36 is provided in the reduced diameter portion. However, the injection rod 24 necessarily has a reduced diameter portion. It is not necessary, and the groove 36 does not necessarily need to be provided in the reduced diameter portion. As shown in FIGS. 3 and 4, the groove portion 36 is configured to be covered by the annular portion 30. A channel is formed by the groove 36 and the inner wall surface of the annular portion 30. As shown in FIG. 5 which is a cross-sectional view taken along the line AA in FIG. The groove hole 38 is a through hole that connects the surface of the injection rod 24 and the injection rod hole 32. The groove 38 allows the lubricant to pass from the injection rod hole 32 to the annular hole 40. It should be understood that the number of slot holes 38 may be different. Typically, the diameter of the slot hole 38 is between about 6.5 mm and 19.05 mm (about 1/4 inch to 3/4 inch). However, it need not be the same size as the injection rod hole 32, and typically the diameter of each groove hole 38 is made smaller so that the amount of the mixture of lubricant and air in the injection rod hole 32 is reduced. Equal to the amount of lubricant and air mixture in the interior.

では In the embodiment shown in FIG. 4, the annular portion 30 is disposed so as to cover the recessed groove portion. The annular portion 30 has a cylindrical configuration, and has an outer diameter smaller than the diameter of the plunger tip 26 and larger than the diameter of the injection rod 24 around the groove 36. From the viewpoint of allowing the lubricant to reach the inner side of the injection sleeve 20, the annular portion 30 is preferably arranged as close as possible to the plunger tip 26 (for example, immediately behind the plunger tip 26). The annular portion 30 may be fixed, for example, by inserting and fitting the annular portion 30 into a portion where the groove 36 is formed. The annular portion 30 may be removable from the groove 36. By removing the annular portion 30 from the groove 36 as shown in FIG. 3, the inside of the groove 36 and the groove 38 can be easily cleaned. The groove 36 can be formed by various methods. For example, it may be formed by providing two annular members on the surface of the injection rod 24, or may be formed as a part of the injection rod 24 (for example, by shaving the surface of the injection rod 24). A plurality of holes (annular portion holes) 40 are formed in the annular portion 30 symmetrically around the annular portion 30. The annular portion hole 40 is a through hole connecting the outer surface and the inner surface of the annular portion 30. The number of the annular holes 40 depends on the circumference of the injection rod 24. The diameter of the annulus hole 40 is preferably about 1.81 to 6.5 mm (about 1/14 to 1/4 inch). Typically, the annular hole 40 is smaller than the groove hole 38 such that the amount of the lubricant and air mixture in the groove hole 38 is equal to the amount of the lubricant and air mixture in the annular hole 40. Make it smaller. Preferably, the annular hole 40 extends conically. This makes it easier for the lubricant supplied into the injection sleeve 20 to spread radially.

As apparent from FIGS. 4 and 5, the lubricant supplied from the end of the injection rod hole 32 (the end on the side where the plunger tip 26 is not connected) passes through the injection rod hole 32 and forms an annular portion. The groove hole 38 at the bottom of 30 is entered, and then the lubricant (mixed with air) proceeds into the groove 36 and finally exits through the annular hole 40. This design allows the maximum range to be covered with a minimal amount of lubricant. Further, according to the back spray system, it is possible to make the lubricant reach the farthest position in the injection sleeve 20 and also make it possible to reach just behind the plunger tip 26. When the plunger tip 26 is pulled rearward within the injection sleeve 20 over the entire length of the injection sleeve 20, the function of adding a lubricant at an arbitrary position as needed allows a function from the mold to the injection injection position. Evenly covered with lubricant. During retraction of the injection rod 24, a mixture of lubricant and air is forced out of the injection rod hole 32 in the injection rod 24 into a slot 38 hidden in the annulus 30. Then, the mixture of the lubricant and the air is sprayed out in a mist from the annular hole 40 and sprayed radially, thereby covering the injection sleeve 20 with the lubricant while the injection rod 24 is completely retracted. .

〔Example〕
In one embodiment of the present invention, the injection rod 24 has an injection rod hole 32 having a diameter of 7.94 mm (5/16 inch) over the entire length of the injection rod 24. The injection rod holes 32 are for extruding a mixture of lubricant and air into a gun-drilled channel having two groove holes 38 with a diameter of 7.94 mm (5/16 inch). The slot hole 38 is covered by an annular portion 30 having eight annular holes 40 for dispersing the mixture of lubricant and air. The mixture of lubricant and air is pressurized inside the injection rod bore 32 in the injection rod 24 and pushed out into the groove 36 hidden in the annular portion 30 while retracting the injection rod 24 over the entire length of the injection sleeve 20. And was extruded from the eight annular holes 40 under pressure. In order to atomize the lubricant efficiently, the mixture of lubricant and air was pressurized through the injection rod hole 32 while the injection rod 24 was pulled out. The lubricant spread over the entire length of the injection sleeve 20 by spraying, and was pulled out.

では In the conventional example, 2 to 2.5 ml of a mixture of lubricant and air was sprayed from the discharge port for each injection. After the introduction of the backspray system, the usage decreased from 0.75 to 1.0 ml per injection. In the two-month period, eleven plunger tips 26 were replaced by the conventional method of spraying from the discharge port, but four plunger tips 26 were replaced by the back spray system. Further, the life of the injection sleeve 20 has been improved. Thus, consumption of the lubricant was suppressed, and the life of the plunger tip 26 and the injection sleeve 20 was extended. Also, a decrease in the porosity of the die-cast parts was observed.

Those skilled in the art to which these inventions pertain will recognize many variations and other embodiments of the above-described invention which have the benefit of the teachings set forth in the preceding description. Therefore, it is understood that the invention is not to be limited to the specific embodiments disclosed, and that modifications and other embodiments are intended to be included within the scope of the appended claims. Although specific terms are employed herein, they are used only in a generic and descriptive sense, not for purposes of limitation.

(Cross-reference of related applications)
This application claims the benefit of priority to U.S. Provisional Application filed July 26, 2018: 62 / 703,564, the contents of which are hereby incorporated by reference in their entirety. It is.

Reference Signs List 20 injection sleeve 23 injection piston 24 injection rod 26 plunger tip 30 annular part 32 injection rod hole 36 groove 38 groove hole 40 annular part hole

Claims

A back spray system for applying a lubricant to an injection sleeve of a die casting device,
An injection sleeve,
An injection piston having a plunger tip and an injection rod connected thereto;
A groove formed to surround the injection rod,
An annular portion covering the groove,
The injection rod has an injection rod hole formed over the entire length of the injection rod,
In the groove, a groove hole connected to the injection rod hole is formed,
In the annular portion, a predetermined number of annular portion holes communicating with the groove portion are formed along the circumference of the annular portion,
The lubricant supplied to the injection rod hole flows into the groove portion from the groove portion hole, and is discharged from the groove portion through the annular portion hole to a space between the plunger tip and the injection sleeve. , Back spray system.
The backspray system according to claim 1, wherein eight of the annular holes are formed.
The back spray system according to claim 1, wherein at least two of the groove holes are formed.
The backspray system according to claim 1, wherein the annular portion is located behind the plunger tip.
The back spray system according to claim 1, wherein the lubricant is a lubricating oil and is sprayed with air.
An injection piston used in combination with an injection sleeve,
A plunger tip,
An injection rod connected to the plunger tip,
A groove formed to surround the injection rod,
An annular portion covering the groove,
The injection rod has an injection rod hole formed over the entire length of the injection rod,
In the groove, a groove hole connected to the injection rod hole is formed,
In the annular portion, a predetermined number of annular portion holes communicating with the groove portion are formed along the circumference of the annular portion,
Lubricant supplied to the injection rod hole flows into the groove from the groove hole, passes through the annular hole from the groove, and is discharged into the space between the plunger tip and the injection sleeve. Injection piston.
7. The injection piston according to claim 6, wherein eight annular holes are formed.
The injection piston according to claim 6, wherein the lower flow path of the annular portion has at least two holes connected to the injection rod holes.