JPH07214279A - Horizontal type sleeve for die casting machine - Google Patents

Abstract

PURPOSE:To provide a horizontal type sleeve for die casting machine which has an excellent heat insulating property of molten metal, is capable of suppressing generation of a solidified layer, is hardly deformed and is long in life. CONSTITUTION:This sleeve 1A has a three-layered structure consisting of an inside cylinder 4A, an intermediate cylinder 3A and an outside cylinder 2A. This inside cylinder 4A is formed of a ceramic material, a metallic material or a metallic composite material having erosion resistance, wear resistance and thermal impact resistance. The intermediate layer 3A is formed of a metallic material having the coefft. of thermal expansion equal to or higher than the coefft. of thermal expansion of the inside cylinder 4A. The outside cylinder 2A. is formed of a metallic material having low thermal expansion and high strength characteristics. A groove 5A extending in the circumferential direction of the intermediate cylinder 3A is formed on its outer peripheral surface. The boundary surfaces between the respective layers and the groove 5A suppress heat transfer from the inside cylinder to the outside cylinder and, therefore, the heat insulating property of the molten metal is improved and the generation of the solidified layer is suppressed. In addition, deformation is substantially prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die casting machine sleeve for injecting molten metal into a mold with a plunger tip, and more specifically, a die casting machine with its axis extending horizontally. Horizontal injection horizontal cold chamber type die casting machine sleeve (hereinafter referred to as "die casting machine horizontal sleeve")
Regarding

[0002]

2. Description of the Related Art A die casting machine sleeve has a cylindrical body, and is adapted to receive a molten metal therein. A plunger tip is slidably provided inside the sleeve body, and the molten metal supplied is injected into the mold. In the die casting machine, in order to suppress the formation of a solidified layer in the molten metal supplied in the sleeve, a so-called hot sleeve method has been conventionally used for heating the sleeve to improve the heat retaining property of the molten metal. In this hot sleeve method,
There are a heating medium system in which a circulation hole is provided in the sleeve and a heating medium such as oil is circulated, and a heater heating system in which a heater is embedded in the sleeve.

[0003]

However, the hot sleeve method has a problem in that manufacturing of the sleeve and installation of a heater are costly, the heat retaining effect is not sufficient, and a solidified layer is likely to be formed. Further, the sleeve is apt to be eroded from the molten metal when heated, and its hardness is lowered at a high temperature, so that the sleeve is easily worn. Therefore, when the sleeve is made of the SKD61 material as in the conventional case, there is a problem in terms of life.

Further, the heater heating method has a problem that it is difficult to install a heater having a large capacity due to the restriction of the heater installation location, and a sufficient heating effect cannot be achieved. On the other hand, in the heating medium method, when the sleeve temperature becomes equal to or higher than that of the heating medium, the medium acts as a cooling medium on the contrary, and thus the heat retention of the molten metal is rather lowered by circulating the medium. There is also a problem.

In addition to the above problems, the horizontal sleeve in which the shaft is arranged so as to extend horizontally has the following problems. FIG. 5 shows the horizontal sleeve 11 installed on the die casting machine. The horizontal sleeve 11 has a cylindrical main body partially supported by the platen 12 in the axial direction X, and is arranged so that the axis X extends horizontally. One end of the sleeve body 11 is the cavity 1 of the mold 13.
4, a plunger tip 15 is reciprocally slidably provided in the sleeve body 11.
A hot water supply hole 17 is formed in the upper part of the sleeve body 11 in the vertical direction, and molten metal is poured from the hot water supply device 16.

In the horizontal sleeve 11 having such a structure, when it is heated by the hot sleeve method, the platen 12 is heated.
The inner diameter of the portion constrained by the contracts from the expansion of the sleeve to the distorted shape. Therefore, galling of the plunger tip 15 is likely to occur. On the other hand, the sliding portion of the plunger tip 15 is complicatedly deformed by heat, such as the inner diameter of the portion not constrained by the platen 12 is increased. For this reason, it becomes difficult to maintain the clearance between the plunger tip and the sleeve at an appropriate value, wear of the sleeve and the plunger tip is likely to occur, and their life is shortened.

On the other hand, if the horizontal sleeve is not heated, the following problems occur. When the molten metal is poured into the horizontal sleeve 11 from the hot water supply hole 17, a significant temperature difference occurs between the lower portion of the sleeve 11 in the vertical direction in contact with the molten metal and the upper portion in the vertical direction in which the molten metal does not contact. As a result, the portion not constrained by the platen 12 is deformed to warp. Due to such warping, the sleeve 11 and the plunger tip 1
5 wear is accelerated and their life is reduced.

The present invention has been made to solve the above problems, and an object thereof is a horizontal sleeve for a die casting machine which is excellent in heat retention of a molten metal and can suppress the formation of a solidified layer, and is hard to be deformed and has a long life. To provide.

[0009]

In order to achieve the above object, the invention of claim 1 is for a die casting machine having a cylindrical sleeve main body capable of receiving a molten metal therein and having a plunger tip slidable therein. In the horizontal sleeve,
The sleeve body includes an innermost layer (4A, 4D) and an intermediate layer (3
A, 3D) and the outermost layer (2A, 2D) are formed into a three-layer structure, and the innermost layer is made of a ceramic material, a metal material having erosion resistance and wear resistance and thermal shock resistance, erosion resistance and wear resistance. Formed of any one of a metal-based composite material having heat resistance and thermal shock resistance, the intermediate layer is formed of a metal material having a thermal expansion coefficient equal to or greater than that of the innermost layer,
The outermost layer is formed of a metal material having low thermal expansion and high strength characteristics, and at least one of the outer peripheral surface of the intermediate layer and the inner peripheral surface of the outermost layer has at least one of a circumferential direction and an axial direction. Provided is a horizontal sleeve for a die casting machine, which is characterized by forming grooves (5A, 5D) extending in the direction.

According to a second aspect of the present invention, in a horizontal sleeve for a die casting machine, which has a cylindrical sleeve body capable of receiving a molten metal therein and having a plunger tip slidable therein, the sleeve body has an inner layer ( 4B, 4C)
And a two-layer structure composed of outer layers (2B, 2C), wherein the inner layer is made of a metal material having erosion resistance, wear resistance and thermal shock resistance, and a metal base having erosion resistance, wear resistance and heat shock resistance. It is formed of any one of the composite materials, the outer layer is formed of a metal material having low thermal expansion and high strength characteristics, and the outer peripheral surface of the inner layer and at least one of the inner peripheral surface of the outer layer have a circumferential direction. And a horizontal sleeve for a die casting machine, characterized in that grooves (5B, 5C) extending in at least one axial direction are formed.

[0011]

According to the horizontal sleeve for die-casting machine of the present invention having the above-mentioned structure, since the sleeve body has a three-layer structure, the sleeve is formed by the boundary between the innermost layer and the intermediate layer and the boundary between the intermediate layer and the outermost layer. Heat transfer from the inner layer to the outermost layer can be suppressed. Moreover, the groove formed in the intermediate layer or the outermost layer plays a role of a heat insulating layer that blocks the heat conduction from the intermediate layer to the outermost layer and reduces the contact area between the intermediate layer and the outermost layer. Heat transfer to the outermost layer can be further suppressed.

According to the horizontal sleeve for a die casting machine of the second aspect of the present invention, since the sleeve body has a two-layer structure, heat transfer from the inner layer to the outer layer can be suppressed by the boundary between the inner layer and the outer layer. Moreover, the groove formed in the inner layer or the outer layer serves as a heat insulating layer that blocks the heat conduction from the inner layer to the outer layer, and the contact area between the inner layer and the outer layer is reduced, so that the heat transfer from the inner layer to the outer layer is further reduced. Can be suppressed.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A horizontal sleeve for a die casting machine according to a first embodiment of the present invention will be described below with reference to FIG.

As shown in FIG. 1, the horizontal sleeve 1A for die-casting machine of the present embodiment has a cylindrical body whose outer body is an outer cylinder 2A, an intermediate cylinder 3A, and an inner cylinder 4A. It has a three-layer structure. On the outer peripheral surface of the intermediate cylinder 3A, that is, the contact surface with the outer cylinder 2A, annular grooves 5A extending in the circumferential direction are formed at equal intervals in the axial direction. The inner cylinder 4A is incorporated into the intermediate cylinder 3A by shrink fitting, and the intermediate cylinder 3A is incorporated into the outer cylinder 2A by shrink fitting or welding. A hot water supply hole 6A is formed in the upper portion in the vertical direction near one end of the sleeve body 1A.

Since the inner cylinder 4A is directly exposed to the molten metal, it must have excellent erosion resistance, wear resistance, and thermal shock resistance. As a material therefor, ceramics, a metal material excellent in erosion resistance, wear resistance, and thermal shock resistance, and a metal matrix composite material having similar characteristics are preferable.
Specifically, silicon nitride ceramics or SKD61
A metal material such as a surface nitriding material and a metal-based composite material such as a boride-based cermet material are preferable. The intermediate cylinder 3A is
It is desirable that the coefficient of thermal expansion be equal to or larger than that of the inner cylinder 4A in order to prevent shrinkage fit loosening, and the lower the thermal conductivity, the better in order to improve heat retention. For example,
A metal material such as SUS material is preferable. The outer cylinder 2A is preferably a metal material having low thermal expansion and high strength characteristics, for example, a steel material.

Since the horizontal sleeve 1A for die casting machine of this embodiment has a three-layer structure, it has an inner cylinder 4A and an intermediate cylinder 3A.
Due to the boundary between them and the boundary between the intermediate cylinder 3A and the outer cylinder 2A, heat transfer from the inner cylinder 4A to the outer cylinder 2A can be suppressed. Moreover, the groove 5A formed in the intermediate cylinder 3A is
It plays the role of a heat insulating layer that blocks heat conduction from A to the outer cylinder 2A and reduces the contact area between the intermediate cylinder and the outer cylinder, so that heat transfer from the inner cylinder to the outer cylinder can be further suppressed. .
Therefore, the heat retaining effect of the molten metal can be significantly improved, and the formation of a solidified layer in the inner cylinder 4A can be effectively suppressed.

Here, the higher the ratio of the total area of the groove 5A to the entire outer peripheral surface of the intermediate cylinder 3A, the better. This is because the contact area between the intermediate cylinder 3A and the outer cylinder 2A can be reduced and the heat insulating effect can be improved. However, if this ratio is too high, the strength is lowered and the material is easily deformed. Therefore,
This ratio is not particularly limited, but it is desirable to determine it by taking into consideration the heat insulating effect and the strength. Further, the depth of the groove 5A is not particularly limited as long as it is smaller than the thickness of the intermediate cylinder 3A. This is because the effect of the depth of the groove on improving heat insulation cannot be expected.

In the horizontal sleeve 1A of this embodiment, heat conduction from the inner cylinder 4A to the outer cylinder 2A is reduced as described above, so that when the molten metal is poured from the hot water supply hole 6A, the vertical direction of the outer cylinder 2A is increased. The temperature difference between the lower part and the upper part can be reduced. Therefore, it is possible to suppress the deformation of the sleeve due to the warp and reduce the wear of the sleeve and the plunger tip. Further, since the horizontal sleeve 1A of this embodiment has a high heat retaining property, it is not necessary to heat it. Therefore,
No complicated thermal deformation occurs on the inner wall of the sleeve due to heating, and wear of the sleeve and the plunger tip does not occur. Further, since the heat conduction from the inner cylinder to the outer cylinder is suppressed, the temperature increase of the outer cylinder is less than that in the conventional case, and the shrinkage fit is not loosened due to the expansion of the outer cylinder.

Further, since the horizontal sleeve 1A of this embodiment has a multi-layer structure, it is possible to apply a material according to the characteristics required in each layer. Moreover, since the manufacturing is relatively easy, the manufacturing cost can be suppressed.

Next, a horizontal sleeve for a die casting machine according to a second embodiment of the present invention will be described with reference to FIG. It should be noted that members that are the same as or correspond to the members shown in FIG. 1 will be described using the same or corresponding reference numbers.

As shown in FIG. 2, the horizontal sleeve 1B for die casting machine of the present embodiment has a two-layer structure in which the cylindrical main body is composed of an outer cylinder 2B as an outer layer and an inner cylinder 4B as an inner layer. . The outer peripheral surface of the inner cylinder 4B, that is, the outer cylinder 2
On the contact surface with B, annular grooves 5B extending in the circumferential direction are formed at equal intervals in the axial direction. The inner cylinder 4B is incorporated into the outer cylinder 2B by shrink fitting.

The material of the outer cylinder 2B is the same as that of the first embodiment.
The same as A is preferable. As the material of the inner cylinder 4B,
Similar to the first embodiment, it must have excellent erosion resistance, wear resistance, and thermal shock resistance. Further, in this embodiment, since the groove 5B is formed in the inner cylinder 4B, the inner cylinder 4B is
Ceramics with low toughness and difficult to process are not suitable. Therefore, as the inner cylinder 4B, a metal material having excellent erosion resistance, wear resistance, and thermal shock resistance and having a higher toughness than ceramics, a metal matrix composite material having similar characteristics, and the like are preferable. Specifically, a metal material such as a SKD61 surface nitriding material or a metal-based composite material such as a boride-based cermet material is preferable.

Since the horizontal sleeve 1B for die casting machine of this embodiment has a two-layer structure, the heat transfer from the inner cylinder 4B to the outer cylinder 2B can be suppressed by the boundary between the inner cylinder 4B and the outer cylinder 2B. Moreover, the groove 5 formed in the inner cylinder 4B
B serves as an adiabatic layer that blocks heat conduction from the inner cylinder 4B to the outer cylinder 2B and reduces the contact area between the inner cylinder and the outer cylinder, so that heat transfer from the inner cylinder to the outer cylinder is further suppressed. can do. Therefore, the heat retention effect of the molten metal can be significantly improved, and the formation of a solidified layer in the inner cylinder 4B can be effectively suppressed. Therefore, the horizontal sleeve 1B of this embodiment can also achieve various excellent effects similar to those of the horizontal sleeve of the first embodiment.

The groove 5 is formed on the entire outer peripheral surface of the inner cylinder 4B.
The ratio of the total area of B is not particularly limited as in the first embodiment. That is, this ratio is better in order to reduce the contact area between the inner cylinder 4B and the outer cylinder 2B and improve the heat insulating effect, but if it is too high, the strength decreases and the material is easily deformed. It is desirable to set it carefully. Further, the depth of the groove 5B is not particularly limited as long as it is smaller than the thickness of the inner cylinder 4B.

Next, a horizontal sleeve for a die casting machine according to a third embodiment of the present invention will be described with reference to FIG. The same or corresponding members as those shown in FIGS. 1 and 2 will be described with the same or corresponding reference numerals.

Similarly to the second embodiment, the horizontal sleeve 1C of this embodiment also has a two-layer structure in which the cylindrical main body is composed of an outer cylinder 2C as an outer layer and an inner cylinder 4C as an inner layer. However, in this embodiment, the annular groove 5C extending in the circumferential direction is used.
Is the inner peripheral surface of the outer cylinder 2C (that is, the contact surface with the inner cylinder 4C)
Is formed in. Also in this embodiment, the annular grooves 5C are formed at equal intervals in the axial direction. Also,
Similar to the second embodiment, the inner cylinder 4C is incorporated into the outer cylinder 2C by shrink fitting.

The material of the outer cylinder 2C is preferably the same as that of the outer cylinders of the first and second embodiments. When the groove 5C is formed in the outer cylinder 2C as in the present embodiment, if a material having a relatively low toughness is used for the inner cylinder 4C in contact with the outer cylinder 2C, the groove in the inner peripheral surface of the outer cylinder is used. There is a possibility that stress concentration may occur in a portion in contact with the portion where 5C is not formed (inner peripheral surface convex portion) and the inner cylinder may be cracked. Therefore, as for the material of the inner cylinder 4C, as in the second embodiment, erosion resistance, wear resistance,
In addition to being excellent in thermal shock resistance, it must have high toughness and be difficult to crack. Therefore, the inner cylinder 4
The material of C is preferably the same as that of the second embodiment.

Similarly to the groove 5B of the second embodiment, the groove 5C formed in the outer cylinder 2C also serves as a heat insulating layer that blocks heat conduction from the inner cylinder 4C to the outer cylinder 2C, and the inner cylinder and the outer cylinder The contact area with the cylinder is reduced, and heat transfer from the inner cylinder to the outer cylinder is suppressed. Therefore, the horizontal sleeve 1C of this embodiment can also achieve the same effect as that of the second embodiment.

The groove 5 is formed on the entire inner peripheral surface of the outer cylinder 2C.
The ratio of the total area of C is not particularly limited as in the first and second embodiments. That is, this ratio is 4C for the inner cylinder and 2 for the outer cylinder.
In order to reduce the contact area of C and improve the heat insulating effect, the higher the better, the better, but if it is too high, the strength will decrease and the material will be easily deformed. Further, the depth of the groove 5C is not particularly limited as long as it is smaller than the thickness of the outer cylinder 2C.

In the third embodiment, as described above,
The inner cylinder 4C having a certain degree of toughness is used to prevent cracking of the inner cylinder due to stress concentration. However, by interposing the intermediate cylinder between the outer cylinder and the inner cylinder, it is possible to prevent stress concentration from occurring in the inner cylinder, so that a material having relatively low toughness can be used for the inner cylinder.

The fourth embodiment of the present invention shows such a structure. Hereinafter, a horizontal sleeve for a die casting machine according to the fourth embodiment will be described with reference to FIG. The same or corresponding members as those shown in FIGS. 1 to 3 will be described with the same or corresponding reference numerals.

The horizontal sleeve 1D of this embodiment has a three-layer structure in which the cylindrical main body is composed of an outer cylinder 2D which is the outermost layer, an intermediate cylinder 3D which is the intermediate layer, and an inner cylinder 4D which is the innermost layer. Similar to the first embodiment, the inner cylinder 4D is incorporated in the intermediate cylinder 3D by shrink fitting, and the intermediate cylinder 3D is incorporated in the outer cylinder 2D by shrink fitting or welding.

The material of the outer cylinder 2D is preferably the same as that of the outer cylinders of the first, second and third embodiments. The material of the inner cylinder 4D needs to have excellent erosion resistance, abrasion resistance, and thermal shock resistance, but may have relatively low toughness. Specifically, ceramics, for example, silicon nitride ceramics may be used. Further, metal materials having excellent erosion resistance, wear resistance, and thermal shock resistance, and metal matrix composite materials having similar characteristics can be widely used regardless of their toughness. For example, a metal material such as a SKD61 surface nitriding material or a metal matrix composite material such as a boride-based cermet material can be used. In other words, as the material of the inner cylinder 4D, the same material as the inner cylinder 4A of the first embodiment can be adopted. The material of the intermediate cylinder 3D is preferably the same as that of the intermediate cylinder 3A of the first embodiment.

In the horizontal sleeve 1D having the three-layer structure of this embodiment, the groove 5D formed in the outer cylinder 2D is similar to the groove 5A of the first embodiment in that the heat conduction from the intermediate cylinder 3D to the outer cylinder 2D is performed. Plays a role of a heat insulating layer that shuts off heat, reduces the contact area between the intermediate cylinder and the outer cylinder, and suppresses heat transfer from the inner cylinder to the outer cylinder. Therefore, the horizontal sleeve 1D of this embodiment can also obtain the same effect as the sleeve of the first embodiment.

The groove 5 is formed on the entire inner peripheral surface of the outer cylinder 2D.
The ratio of the total area of D is not particularly limited, like the first, second, and third embodiments. That is, this ratio is preferably as high as possible in order to reduce the contact area between the intermediate cylinder 3D and the outer cylinder 2D and improve the heat insulating effect, but if it is too high, the strength is lowered and the material is easily deformed. It is desirable to weigh it in comparison. Further, the depth of the groove 5D is not particularly limited as long as it is smaller than the thickness of the outer cylinder 2D.

The present invention is not limited to the horizontal sleeve of the above embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, in the above-described embodiment, the groove for heat insulation is an annular groove that extends in the circumferential direction, but it is an axial groove that extends linearly in the axial direction and is formed at equal intervals in the circumferential direction. You may do it. Furthermore, both the annular groove and the axial groove may be formed.
The annular grooves and the axial grooves may not be formed at equal intervals. Further, the groove for heat insulation may be formed on both the inner peripheral surface of the outer cylinder and the outer peripheral surface of the intermediate cylinder or the inner cylinder which is in contact with the inner peripheral surface.

[0037]

According to the horizontal sleeve for a die casting machine of the present invention described in detail above, the sleeve body has a two-layer structure composed of an outer layer and an inner layer, or an outermost layer, an intermediate layer, and
The innermost layer has a three-layer structure, and grooves for heat insulation are formed on the inner peripheral surface of the outer layer or outermost layer and the outer peripheral surface of the inner layer or intermediate layer. Therefore, due to the boundary surface between each layer and the groove,
Heat transfer from the inner layer to the outer layer or from the innermost layer to the outermost layer in the horizontal sleeve body can be suppressed. For this reason,
It is possible to improve the heat retention of the molten metal and suppress the formation of a solidified layer on the inner wall of the sleeve body. Also,
Since the amount of heat transfer to the outer layer or the outermost layer is reduced in this way, it is possible to suppress the warpage caused by hot water supply. Furthermore, since it has sufficient heat retention and does not require heating, it is possible to reduce complicated thermal deformation that occurs when heating is performed. Therefore, the wear of the sleeve body and the plunger tip can be reduced, and the service life of them can be improved.

[Brief description of drawings]

FIG. 1 is a transverse sectional view showing a first embodiment of a horizontal sleeve for a die casting machine of the present invention.

FIG. 2 is a transverse sectional view showing a second embodiment of the horizontal sleeve for a die casting machine of the present invention.

FIG. 3 is a cross-sectional view showing a third embodiment of the horizontal sleeve for a die casting machine of the present invention.

FIG. 4 is a cross-sectional view showing a fourth embodiment of the horizontal sleeve for a die casting machine of the present invention.

FIG. 5 is a cross-sectional view showing a state in which a conventional horizontal sleeve is arranged on a die casting machine.

[Explanation of symbols]

1A, 1B, 1C, 1D Horizontal sleeve for die casting machine 2A, 2B, 2C, 2D outer cylinder 3A, 3B, 3C, 3D intermediate cylinder 4A, 4B, 4C, 4D inner cylinder 5A, 5B, 5C, 5D groove 6A, 6B, 6C, 6D Hot water supply hole 11 Horizontal sleeve for conventional die casting machine 12 Platen 13 Mold 14 Cavity 15 Plunger tip 16 Hot water supply device 17 Hot water supply hole

Claims (2)

[Claims] 1. A horizontal sleeve for a die casting machine, comprising a cylindrical sleeve body capable of receiving a molten metal therein and having a plunger tip slidable therein, wherein the sleeve body comprises an innermost layer, an intermediate layer and an outermost layer. Which has a three-layered structure, the innermost layer of which is any one of a ceramic material, a metal material having erosion resistance, wear resistance and thermal shock resistance, and a metal matrix composite material having erosion resistance, wear resistance and heat shock resistance. The intermediate layer is formed of a metal material having a thermal expansion coefficient equal to or larger than that of the innermost layer, and the outermost layer is formed of a metal material having low thermal expansion and high strength characteristics. A die casting machine characterized in that a groove extending in at least one of a circumferential direction and an axial direction is formed in at least one of the outer peripheral surface of the layer and the inner peripheral surface of the outermost layer. Horizontal sleeve. 2. A horizontal sleeve for a die casting machine having a cylindrical sleeve body capable of receiving a molten metal therein and having a plunger tip slidable therein, wherein the sleeve body has a two-layer structure including an inner layer and an outer layer. None, the inner layer is formed of any one of a metal material having erosion resistance, wear resistance and thermal shock resistance, and a metal matrix composite material having erosion resistance, wear resistance and heat shock resistance, and the outer layer Is formed of a metal material having low thermal expansion and high strength characteristics, and a groove extending in at least one of a circumferential direction and an axial direction is formed on at least one of the outer peripheral surface of the inner layer and the inner peripheral surface of the outer layer. A horizontal sleeve for die-casting machines that is characterized by