JPH11291009A - Device for supplying lubricating composition for plunger tip - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lubricating composition supplying device for uniformly supplying and coating the lubricating composition on the outer peripheral surface, etc., of a plunger tip. SOLUTION: This lubricating composition supplying device for plunger tip is provided with an annular base body 1 which is cut off at the lower portion and where plural lubricating composition supplying holes 13 are arranged so as to be mutually faced at a prescribed interval on the outer peripheral surface of the plunger tip 3. The annular base body 1 is disposed so as to surround the outer peripheral surface except the lower portion of the plunger tip 3 near the outer part at the rear end of a plunger sleeve 2. The lubricating composition is not limited, but is desirable to be an emulsion type water soluble lubricating composition containing 10-50 pts.wt. of silicone oil. Further, the lubricating composition is particularly desirable to have 80-100% modified ratio with an alkyl group having 10-16 number of carbons and contain the silicone oil having 500-4000 pa.s viscosity at 25 deg.C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a plunger tip lubricant supply device for supplying a lubricant composition to an outer peripheral surface of a plunger tip of a die casting machine. The lubricant supply device of the present invention can supply the lubricant composition efficiently and uniformly to the entire outer peripheral surface of the plunger tip while having a simple structure. As the lubricant composition, an emulsion-type water-soluble lubricant composition is preferable, which can sufficiently prevent seizure and wear of the plunger tip, and also suppress dirt around the lubricant supply device.

[0002]

2. Description of the Related Art The die casting method is widely used for parts and products in various fields such as vehicles and electric equipment because a high quality molded product can be efficiently produced. In this die casting method, a number of lubricant supply devices for sufficiently supplying a lubricant composition to an inner peripheral surface of a plunger sleeve or an outer peripheral surface of a plunger tip and suppressing seizure and wear of the sleeve and the tip have been proposed. Have been. However, many devices have considerably complicated structures, and they are not easy to operate. Furthermore, it cannot be said that sufficient consideration is given to dirt around the device.

[0003] Conventionally, water-insoluble and water-soluble lubricant compositions have been used as plunger tip lubricant compositions. However, the water-insoluble lubricant composition has problems in that, in addition to the generation of a large amount of gas, the periphery of the plunger tip and the plunger sleeve and the like are easily contaminated and smoke is generated. In addition, there is a problem that there is a danger of fire and the like. At present, the lubricant composition is being shifted to a water-soluble lubricant composition.
On the other hand, the use of the water-soluble lubricant composition surely reduces smoke and the like, and eliminates the risk of fire. On the other hand, the lubricating performance is not always sufficient, and a wax or the like is often used in combination for the purpose of improving the lubricating property.
For this reason, non-volatile components accumulate on the periphery of the plunger tip and the plunger sleeve and the like, which may cause contamination.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and comprises an annular base having a specific structure provided at or near a rear end face of a plunger sleeve, An object of the present invention is to provide a plunger tip lubricant supply device for efficiently and uniformly supplying a required amount of a lubricant composition to the entire outer peripheral surface of a plunger tip. By the lubricant supply device of the present invention, in particular, an emulsion-type water-soluble lubricant composition is supplied to the outer peripheral surface of the plunger tip, and applied, thereby sufficiently preventing seizure and wear of the plunger tip, In addition, the generation of dirt around the lubricant supply device is sufficiently suppressed.

[0005]

According to a first aspect of the present invention, there is provided a lubricant supply device for a plunger tip, comprising a plurality of lubricant supply holes having an annular base opening on an inner peripheral surface thereof. The hole is provided at a portion of the base except for a portion below the inner peripheral surface, and the base is circumferentially arranged on the rear end surface of the plunger sleeve or near the outside thereof so as to surround the outer peripheral surface of the plunger tip. It is characterized by being provided.

According to the plunger tip lubricant supply device, a required amount of the lubricant composition can be efficiently and uniformly supplied and applied to the entire outer peripheral surface of the plunger tip. The lubricant composition is not particularly limited, and includes a composition having excellent lubricity at high temperatures, including a mineral oil as a base oil, an oil agent and a wax, or various petroleum-based lubricants. Can be used. In addition, when the emulsion-type water-soluble lubricant composition is used, supply and application are easier, the seizure of the plunger chip is sufficiently prevented, and dirt around the lubricant supply device is suppressed.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (1) Structure of Lubricant Supply Apparatus Hereinafter, a plunger tip lubricant supply apparatus according to a second invention will be described in detail with reference to FIGS. 1, 2 and 3. FIG. FIG. 1 shows an annular substrate 1 cut away at the lower part.
Is a schematic view showing a state in which is disposed on the rear end face of the plunger sleeve 2 of the die casting machine. This figure 1
, The plunger tip 3 is connected to and fixed to the plunger rod 4. The plunger tip 3 is retracted, and a molten metal such as aluminum is injected from a pouring port 21 provided above the rear end edge of the plunger sleeve 2.

After the molten metal is injected, casting is performed by advancing the plunger tip 3.
At this time, the base 1 having an annular structure, which is disposed on the outer peripheral surface of the plunger tip 3 that is advancing and on the rear end surface of the plunger sleeve 2 and has a cutout in a lower part, that is, corresponds to the second invention. The lubricant composition is supplied from a lubricant supply hole provided in the base 1 having the structure, and is applied to the outer peripheral surface of the plunger tip 3. Note that a lubricant injection port 11 is opened on a side surface near the upper portion of the annular base 1. And
One end of a pipe 5 provided with a flow meter, a pump and the like is connected to the inlet 11, and the other end of the pipe 5 is connected to a container containing a lubricant composition to constitute a lubricant supply device. Have been.

As described above, the lubricant is supplied to the outer peripheral surface of the plunger tip 3 which is advancing as described above, from the lubricant supply hole provided in the fixed annular base 1 which is disposed on the rear end surface of the plunger sleeve 2. By supplying the composition, the lubricant composition can be uniformly supplied and applied to the entire surface from the front end to the rear end in the length direction of the plunger chip 3. Further, according to the lubricant supply device of the present invention, by adjusting the injection timing of the lubricant composition, the lubricant composition is supplied only to a desired portion in the length direction of the plunger tip 3 and applied. Can be done. Further, by appropriately adjusting the supply amount of the lubricant composition according to the type of the lubricant composition, the required lubricity, or the moving speed of the plunger tip 3, sufficient lubricating performance can always be obtained and required. It can also be ensured that no lubricant composition is supplied in excess.

FIG. 2 is a front view of FIG. 1 viewed from the direction (a). FIG. 3 is a cross-sectional view of X in the annular base 1 of FIG.
It is the expanded sectional view which expanded the -X 'cross section. 2, the annular base 1 is arranged concentrically so that the inner peripheral surface 12 thereof faces the outer peripheral surface 31 of the plunger tip 3 at a predetermined interval. However, this substrate 1
Is not a continuous annular structure, but is notched at the lower part.

The approximate ratio of the length of the notched portion to the entire circumference can be represented by an angle. Although the angle is not particularly limited, it is 60 to 150 °, particularly 80.
The angle is preferably set to about 150 °, more preferably 90 ° to 130 °, and in this embodiment, it is about 120 °. By providing the notch in the lower portion as described above, the lubricant composition is not supplied from the lower portion, and the lubricant composition is excessively applied to the lower portion of the outer peripheral surface 31 of the plunger tip 3. Never. Further, even if the lubricant composition drips from a portion below the outer peripheral surface 31 of the plunger tip 3, the inner peripheral surface 12 of the base 1 is not stained.

Further, as shown in an enlarged cross-sectional view in FIG. 3, a lubricant supply hole 1 is formed in an inner peripheral surface 12 of the annular base 1.
3 is open. And this lubricant supply hole 13 is
The plunger tip 3 is provided obliquely in the forward direction (the direction of the arrow in FIG. 3). Therefore, the lubricant composition is sprayed obliquely forward, and the lubricant composition is reliably supplied to the tip of the plunger tip 3 and applied.

The angle at which the lubricant supply hole 13 is provided forward can be determined according to the type of the lubricant composition, the required lubricity, the moving speed of the plunger tip 3, and the like. it can. In the case of a generally used die-casting machine, the angle P in FIG. 3 can be set to about 45 °, so that the lubricant composition can be reliably supplied to the tip of the plunger tip 3 and applied. it can. Further, the lubricant supply hole 13 does not necessarily need to be provided obliquely forward, and depending on the type of the lubricant composition, etc., the outer peripheral surface 3 of the plunger tip 3 may be provided.
1, and the lubricant composition may be supplied to the outer peripheral surface 31 at a right angle. Further, the lubricant supply hole 13 may be provided obliquely toward the retreating direction of the plunger tip 3.

The lubricant composition contained in the container is supplied to a lubricant injection port 11 provided on a side surface near the upper portion of the annular base 1.
Thus, the lubricant is injected through the pipe 5 and is conveyed to the respective lubricant supply holes 13 by the annular flow passage 14 provided inside the annular base 1. This lubricant supply hole 13 is
As in the present invention, it is preferable to provide one at least above, to the left and to the right of the annular base 1. In particular, 3 to 14 pieces are arranged at substantially equal intervals in the circumferential direction of the annular base 1,
More preferably, about 5 to 12 pieces are provided. In this embodiment, ten annular bases 1 are provided at equal intervals in the circumferential direction. If the number of the lubricant supply holes 13 is less than three, it becomes difficult to uniformly supply and apply the lubricant composition to the entire outer peripheral surface 31 of the plunger tip 3. If 14 lubricant injection holes 13 are provided, the lubricant composition can be easily and evenly supplied to the entire outer peripheral surface 31 of the plunger tip 3 irrespective of the type of the lubricant composition. , Can be applied.

(2) Lubricant composition In the lubricant supply device of the above (1), the lubricant supply device can supply a required amount to the outer peripheral surface of the plunger tip and apply it. If it is, it can be used without particular limitation. As the lubricant composition, an emulsion type and water-soluble one is preferable as in the fourth invention. Further, as in the fifth invention, an emulsion-type water-soluble lubricant composition containing silicone oil is particularly preferable. Further, when the lubricant composition is 100 parts by weight, a composition containing 10 to 50 parts by weight of silicone oil is more preferable. When the content of the silicone oil is less than 10 parts by weight, sufficient lubrication performance cannot be obtained, and seizure may occur.
On the other hand, when the content is 50 parts by weight, a lubricant composition having sufficient lubrication performance can be obtained. If the content is more than 50 parts by weight, problems such as high viscosity of the emulsion and gelation are likely to occur, and the cost is disadvantageous.

The above-mentioned lubricant composition is excellent in fluidity, and can be easily and uniformly supplied and applied to the outer peripheral surface of the plunger tip by the lubricant supply device of the present invention. Furthermore, it has excellent lubrication performance and high heat resistance, so that non-volatile components are not deposited on the periphery of the plunger sleeve and the like, and the lubricant supply device and its surroundings are not stained.

Further, as the silicone oil, an alkyl-modified silicone oil having a modification ratio by an alkyl group of 80 to 100% is more preferable. This modification rate is 80%
If it is less than 3, the lubricating performance of the obtained lubricant composition may not be sufficiently improved. Although the number of carbon atoms of the alkyl group is not particularly limited, a silicone oil modified with an alkyl group having 10 to 16 carbon atoms, particularly an alkyl group having 10 to 14 carbon atoms, and furthermore, an alkyl group having 12 carbon atoms is liquid at room temperature. And a small coefficient of friction. In addition, except for the portion modified by the alkyl group having 10 to 16 carbon atoms, a methyl group or the like has 10 to 1 carbon atoms.
Any modifying group other than 6, such as an alkyl group, a phenyl group, an aralkyl group, and a fatty acid residue may be bonded.

The lubricant composition has a viscosity at 25 ° C. of 500 to 4000 mPa, as in the sixth invention.
The one containing silicone oil of about s is preferable. This viscosity is particularly preferably in the range of 1000 to 2000 mPa · s. With such a lubricant composition containing silicone oil, it can be evenly supplied and applied to the entire outer peripheral surface of the plunger tip, and the stickiness around the device can be further reduced. The viscosity of this silicone oil depends on the type of modifying group,
It can be easily adjusted depending on the degree of polymerization.

Furthermore, in this emulsion type water-soluble lubricant composition, various additives usually used in addition to this kind of lubricant composition are not impaired in appropriate fluidity and lubrication performance. Within the range, the required amount can be added. Examples of such additives include antioxidants such as hindered phenols and aromatic amines, rust inhibitors such as organic amines, and oiliness improvers such as fats and oils and fatty acids.

(3) Performance evaluation of the lubricant supply apparatus of the present invention using the above-mentioned lubricant composition A silicone oil having the viscosity shown in Table 1, and the number of carbon atoms and the modification rate of the alkyl group as the modifying group was used. An emulsion-type water-soluble lubricant composition containing the components in the ratios shown in Table 1 was prepared. Also, 10 parts by weight of oxidized wax and 30 parts by weight
An emulsion-type lubricant composition of Experimental Example 10 in which parts by weight of vegetable oil was emulsified was prepared.

Using these lubricant compositions, three types of die casting machines having the mold clamping force and the diameter of the plunger tip shown in Table 2 were combined with the lubricant supply device of the above-mentioned (1) and operated. Then, the presence or absence of burn-in was observed. Further, when no seizure occurred, the degree of dirt on the periphery of the plunger tip due to the deposit was observed. The supply amount of the lubricant composition was 3 to 5 ml / shot. Table 2 shows the results. In Table 2, ○ indicates that no image sticking was observed, and X indicates that image sticking occurred.

[0022]

[Table 1]

[0023]

[Table 2]

According to the results shown in Table 2, Experimental Examples 3 to 3 using the lubricant compositions containing a predetermined amount of the specific silicone oil were carried out.
In No. 6, it can be seen that, regardless of the type of the die casting machine, seizure does not occur and dirt on the periphery of the plunger chip due to deposits is small. Further, in Experimental Example 1 in which the concentration and viscosity of the silicone oil were low, seizure occurred except for small models. Furthermore, in Experimental Example 2 in which the viscosity of the silicone oil was low and the concentration was relatively low, burn-in occurred in a large model. In these Experimental Examples 1 and 2, burn-in occurred, but dirt due to deposits was small.

On the other hand, in Experimental Example 7 in which the concentration of the silicone oil is still lower, in Experimental Example 8 in which the viscosity of the silicone oil is lower, and in Experimental Example 9 in which the number of carbon atoms of the alkyl group as the modifying group is small, burn-in occurs in all models. There has occurred. Further, in Experimental Example 10 containing a wax similarly to the conventional lubricant composition for a plunger tip, although seizure did not occur except for a large-sized model, there was much dirt on the periphery of the plunger tip due to deposits. I understand.

As shown in the above evaluation results, even with a lubricant composition containing a specific silicone oil and having a predetermined composition, a small amount of dirt is observed on the periphery of the plunger tip, and oxidized wax is removed. In conventional lubricant compositions containing
A lot of deposits and considerable soiling are observed. However, in the lubricant supply device having a specific structure according to the present invention, an excessive amount of the lubricant composition is supplied to a portion below the outer peripheral surface of the plunger tip and is not applied. It can be seen that is kept low.

It should be noted that the present invention is not limited to the above-described embodiment, but may be variously modified within the scope of the present invention depending on the purpose and application. For example,
Although the annular base shown in FIG. 2 is notched at the lower part thereof, the annular base has a structure without this notch and has no lubricant supply hole at the lower part. Can also. Even if the structure has no notch, the same operation and effect can be obtained by supplying and applying the lubricant composition only from above except for a specific portion below.

Even with this notched structure, the required amount of the lubricant composition is evenly applied to the entire outer peripheral surface of the plunger tip, and excess lubricant is applied to a portion below the outer peripheral surface of the plunger tip. No composition is supplied. For this reason, the surplus lubricant composition does not drip, accumulate, and become contaminated below the inner peripheral surface of the plunger tip. However, if the lower portion is notched, for example, even if the lubricant composition having a high fluidity drips, the periphery of the supply device and the like are not stained, and as in the second invention. It is more preferable to adopt a simple structure. Further, in the lubricant supply device of the present invention, the lubricant composition, not only the outer peripheral surface of the plunger tip,
It can be supplied and applied to the inner peripheral surface near the rear end of the plunger sleeve.

[0029]

The lubricating device for a plunger tip according to the first aspect of the present invention has a simple structure and uniformly supplies and applies a predetermined amount of a lubricant composition to the entire outer peripheral surface of the plunger tip. be able to. In particular, in the lubricant supply devices of the second and third inventions, the lubricant composition can be more uniformly supplied and applied to the entire outer peripheral surface of the plunger tip. According to this lubricant supply device, the fourth, fifth
And when the emulsion-type water-soluble lubricant composition, particularly the emulsion-type water-soluble lubricant composition having a specific composition, is used as in the sixth invention, the composition is applied to the entire outer peripheral surface of the plunger tip. Can be easily supplied and applied.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a relative positional relationship between a plunger tip, a plunger sleeve, and an annular base.

FIG. 2 is a front view of FIG. 1 viewed from a direction (a).

FIG. 3 is an enlarged cross-sectional view obtained by enlarging a cross section taken along line XX ′ of FIG. 2;

[Explanation of symbols]

Reference Signs List 1; annular base, 11; lubricant inlet, 12; inner peripheral surface of base, 13; lubricant supply hole, 14; annular flow path, 2; plunger sleeve, 21; pouring opening, 3; plunger tip 31; outer peripheral surface of plunger tip; 4; plunger rod; 5;

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroaki Hirano 3rd Ishin Light Metal Co., Ltd., 12 Nagoe, Shinminato City, Toyama Prefecture (72) Inventor Yasuhiko Yamanaka 1580 Tabata, Samukawa-cho, Koza-gun, Kanagawa Prefecture Yushiro Chemical Industries In-company (72) Inventor Masanori Takao 1580 Tabata, Samukawa-cho, Koza-gun, Kanagawa Prefecture Inside Yushiro Chemical Industry Co., Ltd.

Claims (6)

[Claims] A plurality of lubricant supply holes each including an annular base which is open at an inner peripheral surface thereof, wherein the lubricant supply holes are provided at portions of the base except for a portion below the inner peripheral surface. The lubricant supply device for a plunger tip is characterized in that the base is disposed in the circumferential direction at the rear end face of the plunger sleeve or near the outside thereof so as to surround the outer peripheral face of the plunger tip. 2. The plunger tip lubricant supply device according to claim 1, wherein a lower portion of the base is cut off. 3. The substrate according to claim 1, wherein the lubricant supply hole is provided at least on an upper side, a left side, and a right side of the base, and is opened on an inner peripheral surface of the base. The lubricant supply device for a plunger tip according to the above. 4. A container accommodating a lubricant composition, one end of which is connected to a lubricant composition inlet provided on the base,
The other end is provided with a pipe connected to the container, the emulsion type water-soluble plunger tip lubricant composition contained in the container is supplied to the outer peripheral surface of the plunger tip,
The plunger tip lubricant supply device according to any one of claims 1 to 3, wherein the lubricant supply device is applied. 5. When the above-mentioned lubricant composition for an emulsion-type water-soluble plunger tip is 100 parts by weight,
It contains 0 to 50 parts by weight of silicone oil, and the modification rate of the silicone oil by an alkyl group is 80 to 100.
The lubricant supply device for a plunger tip according to claim 4, wherein the alkyl group has 10 to 16 carbon atoms. 6. The plunger tip lubricant supply device according to claim 5, wherein the viscosity of the silicone oil at 25 ° C. is 500 to 4000 mPa · s.