JP2002011560A - Mechanism and method for supplying plunger lubricator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a supplying mechanism by which plunger lubricator can surely can supplied into the tip portion of a sleeve where a load is applied especially. SOLUTION: The mechanism for supplying the plunger lubricator to the inner surface of the sleeve 1 in a cold chamber die casting machine, is provided with a lubricator supplying nozzle 7 arranged in a flow divider 6. The plunger lubricator supplied to the sleeve 1 from the flow divider 6 side by the nozzle 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a mechanism and a method for supplying a plunger lubricant to an inner surface of a sleeve of a cold chamber die casting machine.

[0002]

2. Description of the Related Art As shown in FIG. 3, a plunger lubricant such as water-soluble, oil-based or powder-based lubricant is conventionally sprayed from a hot water supply port 11 of a sleeve 1 or air-blown after dripping from a hot water supply port 11. It is supplied into the sleeve 1 by diffusing. In FIG. 3, 21 is a plunger, 22 is a plunger tip,
31 is a fixed plate, 32 is a fixed die, 41 is a movable plate, 42 is a movable die, 5 is a cavity, 51 is a runner, and 6 is a shunt. The shunt 6 is usually provided on the movable die 42 so as to fit to the tip of the sleeve 1.

[0003]

However, in the above-described conventional supply method of supplying the plunger lubricant from the hot water supply port 11, since the hot water supply port 11 is located at the end of the sleeve 1, the plunger lubricant is supplied to the end of the sleeve 1. In some cases, the lubricant did not spread. In such a case, since the lubricant does not exist at the place where the load is most applied particularly in high-speed injection, the plunger tip 22 is deteriorated due to galling, abrasion, and the like, and the life thereof is shortened. There is a problem that adversely affects the system. In particular, the larger the clamping force, the larger the diameter and the length of the sleeve 1 and the plunger tip 22 to be used.

[0004] It is an object of the present invention to provide a supply mechanism and a supply method capable of reliably supplying a plunger lubricant to a tip portion of a sleeve to which a load is particularly applied.

[0005]

According to the first aspect of the present invention,
In a mechanism for supplying a plunger lubricant to the inner surface of the sleeve of the cold chamber die casting machine, a lubricant supply nozzle provided on the shunt is provided.
It is characterized in that a plunger lubricant is supplied into the sleeve from the side of the shunt.

According to a second aspect of the present invention, in the first aspect of the present invention, the lubricant supply nozzle is provided so as to penetrate the shunt and move forward and backward, and has a valve at a tip thereof. At the time of forward movement, the supply port is located in the inner space of the sleeve, and at the time of retreat, the valve closes the opening of the shunt which faces the inner space of the sleeve and is the same as the surface of the shunt which faces the inner space of the sleeve. It is intended to constitute a plane.

According to a third aspect of the present invention, there is provided a method of supplying a plunger lubricant to the inner surface of a sleeve of a cold chamber die casting machine, wherein the plunger lubricant is supplied into the sleeve from a shunt side.

[0008]

FIG. 1 is a longitudinal sectional view showing a main part of a cold chamber die casting machine employing a plunger lubricant supply mechanism according to the present invention. The basic configuration of this die casting machine is the same as the machine shown in FIG.
, The same reference numerals as those in FIG. 3 indicate the same or corresponding components. Also in this die casting machine, the diverter 6 is provided on the movable die 42 so as to fit to the tip of the sleeve 1.

The supply mechanism of the present invention includes a lubricant supply nozzle 7 provided on the diverter 6. Nozzle 7
Is provided so as to penetrate the shunt 6 from the movable die 42 side toward the inner space 12 of the sleeve 1 and is movable forward and backward. The nozzle 7 has a valve 71 at the front end, and is supported by the rod 81 of the air cylinder 8 at the rear end. The valve 71 closes the opening 61 of the shunt 6 facing the inner space 12 of the sleeve 1 when the nozzle 7 is not operated (retracted), as shown in FIG.
It is provided so as to form the same plane as the surface 62 of the shunt 6 facing the inner space 12. When the nozzle 7 is operated, as shown in FIG.
When 1 is retracted in the direction of arrow A, the ejection hole (supply port) 72 at the tip moves to a position where it is exposed to the inner space 12. Piping for a plunger lubricant supply source and a blow air supply source (both not shown) are connected to the connection hole 73 at the rear end of the nozzle 7.

[0010] The die casting machine provided with the supply mechanism having the above-described structure operates as follows. (1) With the start of mold clamping, the air cylinder 8 operates to advance the nozzle 7, and the ejection hole 72 is moved into the inner space 1 of the sleeve 1.
It is located at 2. (2) At the same time as the completion of the mold clamping, the supply source connected to the nozzle 7 is operated, and the plunger lubricant is ejected from the ejection hole 72. (3) After the ejection of the plunger lubricant is completed, air blowing is performed on the inner space 12. (4) The air cylinder 8 operates and the nozzle 7 retreats,
The valve 71 closes the opening 61 of the shunt 6 and forms the same plane as the surface 62. (5) The molten metal is supplied from the hot water supply port 11 into the sleeve 1,
The plunger 21 operates and the molten metal is pressed into the cavity 5 by the plunger tip 22. (6) The molten metal is solidified, the mold is opened, the cast product is taken out, and the inner surface of the mold is cleaned. (7) A release agent is applied to the inner surface of the mold. Then, the step (1) starts again.

In the above step (2), as shown in FIG. 2, the plunger lubricant is ejected on the side of the shunt element 6. For this reason, the plunger lubricant is reliably supplied near the tip of the sleeve 1. Therefore, the plunger lubricant surely exists at the position where the load is most applied particularly at the time of high-speed injection, so that the life of the plunger tip 22 is improved, and the productivity and cost are improved.

In the step (5), since the valve 71 closes the opening 61 of the shunt 6 and forms the same plane as the surface 62 in the step (4), the shunt 6
The function of dividing the molten metal is not impaired, and the molten metal flows smoothly along the shunt 6 and is pressed into the cavity 5.

[0013]

EXAMPLES The supply method of the present invention and a conventional supply method were compared under the following conditions. Table 1 shows the results. [Common conditions]-Die casting machine 350 ton horizontal cold chamber-Casting case-Material ADC12-Casting temperature 680 ° C-Casting weight 440g-Plunger tip diameter 50φ At the start of casting, use a new plunger tip. .・ Low-speed plunger speed 0.18 m / sec ・ High-speed plunger speed 2.30 m / sec ・ Plunger lubricant Commercial oil-based lubricant, 2 cc / 1 shot [Conventional method] Plunger lubricant was sprayed from hot water supply port 11 . [Method of the Present Invention] The plunger lubricant was supplied using the supply mechanism having the above-described structure. The material of the valve 71 is JIS
Standard SKD61, material of nozzle 7 body is JIS standard SU
This was set to S430.

[0014]

[Table 1]

As can be seen from Table 1, the life of the plunger tip is improved by about 20% according to the method of the present invention using the supply mechanism having the above-described structure. Moreover, generation of abnormal noise and blow noise was also prevented.

[0016]

According to the first or third aspect of the present invention, the plunger lubricant is supplied from the side of the shunt, so that the plunger can be surely provided particularly at the tip end of the sleeve where a load is applied. A lubricant can be supplied. Therefore, the deterioration of the plunger tip due to galling, abrasion and the like can be prevented, the life of the plunger tip can be improved, and productivity and cost can be improved.

According to the second aspect of the present invention, when the lubricant supply nozzle is retracted, the valve closes the opening of the shunt which faces the inner space of the sleeve and makes the same plane as the surface of the shunt which faces the inner space of the sleeve. With this configuration, it is possible to prevent the function of dividing the hot water of the splitter from being impaired, and to flow the molten metal smoothly along the splitter and press-fit the molten metal into the cavity.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a main part of a cold chamber die casting machine employing a plunger lubricant supply mechanism of the present invention.

FIG. 2 is a longitudinal sectional view showing an operation state of the supply mechanism of FIG.

FIG. 3 is a longitudinal sectional view showing a conventional general cold chamber die casting machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sleeve 12 Inner space 6 Shunt 61 Opening 62 Surface 7 Lubricant supply nozzle 71 Valve

Claims (3)

[Claims] 1. A mechanism for supplying a plunger lubricant to an inner surface of a sleeve of a cold chamber die casting machine, comprising: a lubricant supply nozzle provided on a shunt, the nozzle configured to insert a plunger into the sleeve from the shunt side. A plunger lubricant supply mechanism for supplying a lubricant. 2. A lubricant supply nozzle is provided so as to penetrate a shunt and move forward and backward, has a valve at a tip, and has a supply port located in a space in the sleeve when the lubricant is advanced. The valve according to claim 1, wherein, when the valve is retracted, the valve closes an opening of the shunt which faces the inner space of the sleeve and forms the same plane as a surface of the shunt which faces the inner space of the sleeve. Plunger lubricant supply mechanism. 3. A method of supplying a plunger lubricant to an inner surface of a sleeve of a cold chamber die casting machine, wherein the plunger lubricant is supplied into the sleeve from a shunt side.