JP2003205261A - Apparatus and method of applying lubricant on outer circumferential surface of object having cylindrical part - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and apparatus for uniformly applying lubricant thinly and uniformly by feeding a small quantity of particularly the high viscous lubricant on the outer circumferential surface of a sintered compact. <P>SOLUTION: A coating apparatus is composed of 2 divided segments 8a, 8b capable of incorporating and separating around the cylindrical part 2 of the sintered compact 3 and made of a porous material. The coating apparatus is provided with an oil applying means having an oil applying member forming a ring like inner circumferential surface in contact with the outer circumferential surface 4 of the cylindrical part 2 of the sintered compact 3 by the incorporation of the divided segments 8a, 8b, an oil supply means for supplying the fixed quantity of oil to the divided segments constituting the oil applying member and a rotation means for rotating at least one of the sintered compact, and the oil applying member. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and method for uniformly applying lubricating oil to the outer peripheral surface of an object having a cylindrical portion. This invention is a step of putting a sintered body into a die and applying a pressure to perform a kind of plastic working,
It is suitable for thinly and evenly applying a small amount of lubricating oil to the outer peripheral surface of a sintered body having a cylindrical portion during so-called sizing.

[0002]

2. Description of the Related Art An object having a cylindrical portion, for example, a sintered body, is manufactured by molding and sintering raw material powders.
A sintered body made of a material having a large heat shrinkage ratio is difficult to obtain the required shape and dimensional accuracy of a machine component that is a final product only by going through such a manufacturing process. In some cases, it may be necessary to correct the shape of the sintered body to a predetermined shape of the final product by applying the above.

As a means for accurately correcting the dimensions of the sintered body to a desired dimension of the final product, for example, a kind of plastic working is performed by placing the sintered body in a die and applying pressure.
The so-called sizing method is useful.

The sizing method is a method of working a sintered body with a pressing die, in which the frictional force generated between these contact portions is made as small as possible, and the surface of the sintered body is scratched or damaged due to galling or the like. In order to prevent this, it is preferable that a lubricating film such as lubricating oil is interposed between the contact portions.

Therefore, as a method of forming a lubricating film on the outer surface of a sintered body, for example, as described in JP-A-2000-87110, the sintered body is immersed in an oil tank containing oil. A method of forming a lubricating film (immersion method), Japanese Patent Publication No.49-4714
As described in Japanese Patent Publication No. 3, there is a method of spraying oil on the sintered body (spraying method).

However, the above-mentioned dipping method tends to carry away an excessive amount of oil when the sintered body is taken out from the oil tank, and the oil drips downward from the sintered body, causing It is not preferable due to environmental problems such as dirt, and in addition, if some of the oil is accumulated in the corners of the sintered body as shown in FIG. 6, the sintered body is washed in the subsequent washing step. However, the oil cannot be completely removed from the surface of the sintered body, and the oil tends to remain attached to a part of the surface of the sintered body.If annealing is performed as a post-process in this state, Is
A part of the surface of the sintered body is colored white due to the oil oxidation layer, which is not preferable in terms of appearance.

The spraying method cannot spray highly viscous oil and can be used when spraying low viscosity oil, but low viscosity oil has a high function as a lubricating film. Since it is inferior to viscous oil, it is necessary to use high-viscosity oil as a lubricating film, especially when performing strong processing such as sizing, so even if a large amount of low-viscosity oil is sprayed. However, galling could not be sufficiently suppressed.

Further, a method of supplying oil to the pressing die is also conceivable, but in such a case, as shown in FIG. 7, the oil drips downward from the pressing die, which causes environmental problems such as stains around the apparatus, which is preferable. There wasn't.

Therefore, it has been necessary to develop a technique for applying the oil thinly and uniformly to the outer peripheral surface of the sintered body and maintaining the applied state until processing such as sizing is performed.

As such a technique, as shown in FIG.
A method of applying a highly viscous oil to the outer peripheral surface of the sintered body by a worker using a brush or the like may be considered, but such a method is not preferable in terms of workability and safety, and the processing time becomes long. There was a problem.

Therefore, without causing such a problem,
It was necessary to develop a new technique for applying a highly viscous oil thinly and uniformly on the outer peripheral surface of the sintered body.

[0012]

An object of the present invention is to provide an object having a cylindrical portion without the above-mentioned problems.
For example, it is an object of the present invention to provide an apparatus and a method for applying a lubricating oil thinly and uniformly to the outer peripheral surface of a sintered body immediately before sizing by supplying a small amount of a highly viscous lubricating oil.

[0013]

In order to achieve the above object, the apparatus of the present invention is a device for applying lubricating oil to the outer peripheral surface of an object having a cylindrical portion, which is provided around the cylindrical portion of the object. An oil coating that is composed of two divided segments made of a porous material that can be merged and separated, and that forms a ring-shaped inner peripheral surface that contacts the outer peripheral surface of the cylindrical portion of the object by the combination of the divided segments. An oil applying means having a member, an oil supplying means for supplying a fixed amount of oil to each divided segment forming the oil applying member, and a rotating means for rotating at least one of the object and the oil applying member. A device for uniformly applying lubricating oil to the outer peripheral surface of an object having a characteristic cylindrical portion.

The refueling means is a syringe, a dropper or a nozzle, the object is a sintered body, the porous material forming the divided segments is a sponge, and the rotating means for rotating the object is the It is a rotary cylinder having a plurality of clamp members for supporting an object from its inner peripheral surface side, and / or the viscosity of the lubricating oil is
It is preferably 30 cSt or more.

Further, the method of the present invention is a method for applying a lubricating oil to the outer peripheral surface of an object having a cylindrical portion by using any one of the above-mentioned devices, wherein the two divided segments constituting the oil applying member. In a state where they are separated, a certain amount of lubricating oil is supplied by the oil supply means, and then these divided segments are united around the cylindrical portion of the object, and the outer peripheral surface of the cylindrical portion of the object is covered with the oil application member. Lubricating oil is applied by bringing the inner peripheral surfaces into contact with each other, and then the oil applying member is separated into two divided segments, and then the object is rotated by a predetermined angle, and a certain amount of lubricating oil is applied by the lubricating means. , Then two segments are combined around a cylindrical object, and the inner peripheral surface of the oil application member is contacted with the outer peripheral surface of the cylindrical portion of the object to re-apply the lubricating oil, Oil application member 2 And separating the segments, a method of uniformly applying a lubricant to the outer peripheral surface of an object having a cylindrical portion.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described below with reference to the drawings. 1 and 2
FIG. 1 shows a lubricating oil application device according to the present invention, and FIGS. 1 (a) and 1 (b) show a state in which divided segments constituting an oil application member of the oil application device are separated. FIGS. 2 (a) and 2 (b) show a state when the divided segments forming the oil applying member of the oil applying device are combined.

The coating device 1 shown in FIGS. 1 (a) and 1 (b) is a device for applying lubricating oil to the outer peripheral surface 4 of the cylindrical portion 2 of the sintered body 3 which is an object having the cylindrical portion 2. An oil applying means 5,
It comprises refueling means 6 and rotating means 7.

The oil applying means 5 is a cylindrical portion 2 of the sintered body 3.
A porous material capable of coalescing and separating around, preferably 2 sponge segments 8a, 8b with sponge,
By combining the divided segments 8a and 8b, as shown in FIG. 2 (a), an oil application member 5 that forms a ring-shaped inner peripheral surface 9 that contacts the outer peripheral surface 4 of the cylindrical portion 2 of the sintered body 3. have.

Incidentally, in FIG. 1, each of the divided segments 8a, 8b
Shows the case where the ring-shaped oil applying member 5 is divided into two equal parts at a position of 180 ° and is formed into a semicircular shape. However, the oil applying member 5 is composed of at least two divided segments. It suffices to use a segment segment that is segmented at a position other than 180 °, or it may be composed of three or more segment segments and can be appropriately selected as necessary.

Further, in FIG. 1, the oil applying means 5 mounts the oil applying members 8a and 8b on the jig 14 attached to the tip of the shaft 13 of the oil applying cylinder 12 through the spring relief holder 10, Although the case where the oil application member 5 is combined and separated by moving the shaft 13 of the cylinder 12 (left and right direction in FIG. 1) is shown, the present invention is not limited to this configuration.

The oil supply means 6 may be of any structure as long as it supplies a fixed amount of oil to each of the divided segments 8a, 8b constituting the oil application member 5, and is not particularly limited.
In order to distribute the lubricating oil thinly and evenly on the inner and outer surfaces of the cylindrical portion 2 of the sintered body 3, particularly the outer peripheral surface 4 which is particularly difficult to process, by using a small amount of oil, for example, injection as shown in FIG. Needle 1
It is preferable that a small amount of oil can be supplied by a single refueling, such as a syringe 16 (injection device) having 5 or a dropper.

For supplying oil to the oil applying member 5 by the oil supplying means 6, as shown in FIG. 1 (b), the oil supplying means 6 is provided for each of the divided segments 8a, 8b constituting the oil applying member 5. Preferably, it is preferable to refuel the divided segments 8a and 8b in the uncombined state.

The rotating means 7 may have a structure that rotates at least one of the sintered body 3 and the oil coating member 5.
For example, FIG. 1 shows an example of the rotating means 7 for rotating the sintered body 3, but the rotating means 7 shown in this figure includes a plurality of clamps for supporting the sintered body 3 from the inner peripheral surface side thereof. The rotary cylinder 18 has a three-jaw chuck 17 as a member and can rotate up to 180 °. By rotating the rotary cylinder 18, the sintered body can be rotated.

Further, in the present invention, the outer peripheral surface 4 of the sintered body 3 is
It is necessary to apply a highly viscous oil thinly and evenly to the outer peripheral surface 4 and to have a viscosity of the oil such that the oil can be maintained in a uniform state until the subsequent processing such as sizing. Therefore, the viscosity of the lubricating oil is preferably 30 cSt or more. Further, if the viscosity of the lubricating oil is too high, it is not preferable from the viewpoint of variation in the coating amount. Therefore, the upper limit of the viscosity of the lubricating oil is preferably 400 cSt.

Next, an example of a method for applying a lubricating oil using the above-mentioned application device will be described below with reference to FIGS. 3 (a) to (f) and FIG. 3 (a) to 3 (f) show a series of steps for applying the lubricating oil to the outer peripheral surface 4 of the sintered body 3, and FIG. 4 shows the steps shown in FIG. It is a case where the sintered body 3 after applying the oil is moved to a predetermined position of the sizing die pressing machine 19.

To apply the lubricating oil to the outer peripheral surface 4 of the sintered body 3, first, as shown in FIG. 3 (a), two divided segments 8a, 8b constituting the oil applying member 5 are In a separated state, by a syringe 16 which is an oil supply means disposed above each divided segment 8a, 8b, a fixed amount, preferably 0.1
Supply a small amount of ~ 0.5 g, more specifically about 1-2 drops of lubricating oil with a syringe 16.

Then, the refueled divided segments 8a, 8a
As shown in FIG. 3 (b), b is united around the cylindrical portion 2 of the sintered body 3 and the ring-shaped oil applying member 5 is formed on the outer peripheral surface 4 of the cylindrical portion 2 of the sintered body 3. By bringing the inner peripheral surface 9 into contact, the lubricating oil exuded from the inner peripheral surface 9 of the oil applying member 5 is applied to the outer peripheral surface 4 of the sintered body 3, and then the oil applying member is divided into two divided segments 8a. , 8b are separated.

As a result, the lubricating oil is thinly and uniformly applied to most of the outer peripheral surface 4 of the sintered body 3, but the dividing surface positions 20 of the dividing segments 8a, 8b constituting the oil applying member 5 are divided.
The lubricating oil was not sufficiently applied to only the portion of the outer peripheral surface 4 of the sintered body 3 corresponding to the above, and there was a case where oil shortage occurred during such sizing and galling occurred.

Therefore, in the coating method of the present invention, the dividing position of the divided segment is shifted, and the lubricating oil is applied again in the same process.

That is, after the oil application member 5 is separated into the two divided segments 8a and 8b, the divided position 20 of the divided segments 8a and 8b when the above-mentioned merging is performed is sintered when the merging is performed again. Since the body 3 is arranged so as to be displaced from the oil-depleted portion, the sintered body 3 is arranged at a predetermined angle, for example, as shown in FIG.
In 3 (c), it is rotated by 90 ° in the direction of arrow 21, and before and after this, a constant amount is supplied by the oil supply means 6, preferably 0.1 to
A small amount of 0.5 g of lubricating oil was supplied to the two segments 8a and 8b, and then the two segments 8a and 8b as shown in FIG. 3 (d).
After a and 8b are united again around the sintered body 3, the outer peripheral surface 4 of the cylindrical portion 2 of the sintered body 3 is brought into contact with the inner peripheral surface 9 of the oil applying member 5 to apply the lubricating oil again, As shown in FIG. 3 (e), by separating the oil application member 5 into two segments 8a and 8b, the lubricating oil is applied thinly and uniformly to the outer peripheral surface 4 of the cylindrical portion 2 of the sintered body 3. In this case, if a highly viscous lubricating oil is used as the lubricating oil to be applied, the sintered body 3 is lifted in the arrow direction 22 as shown in FIG. 3 (f) while maintaining this applied state. Then, it becomes possible to set the sintered body 3 shown in FIG. 4 at a predetermined position of the stamping machine 10 for sizing, by using another conveying means (not shown).

When the lubricating oil is applied to the outer peripheral surface 4 of the sintered body 3 through the above steps using sponges for the divided segments 8a and 8b constituting the oil applying member 5, as shown in FIG. The lubricating oil is applied to the entire outer peripheral surface in the form of a large number of bubble-shaped oil droplets 23 containing air.
23 is more preferable in terms of lubricity.

The above description is merely an example of the embodiment of the present invention, and various modifications can be made within the scope of the claims.

[0033]

According to the present invention, a small amount of lubricating oil, particularly a highly viscous lubricating oil, can be used to thinly and uniformly coat the outer peripheral surface of a sintered body having a cylindrical portion, and the sintering Since the tied body does not need to remove excess oil or supply oil to the die, the environment around the device is not contaminated with oil and the environment is greatly improved. In addition, the coating method of the present invention can be performed in a short time of about 1 to 2 seconds when applying the lubricating oil to one sintered body, and when performing manual work using a brush or the like. Compared with, the workability is dramatically improved.

[Brief description of drawings]

FIG. 1 is a view showing a state in which a divided segment of an oil applying member of a typical oil applying device according to the present invention is separated, where (a) is a plan view and (b) is a side view.

FIG. 2 is a view showing a state where the divided segments of the oil applying member of the oil applying device shown in FIG. 1 are united,
(a) is a plan view and (b) is a side view.

3 (a) to 3 (f) are diagrams showing a series of steps of a coating method according to the present invention.

FIG. 4 is a perspective view showing a state in which a stamping machine that performs sizing by the coating method shown in FIG. 3 is set at a predetermined position.

FIG. 5 is a diagram for explaining a method of manually applying lubricating oil to the outer peripheral surface of the sintered body using a brush.

FIG. 6 is a diagram for explaining a problem caused by the immersion method.

FIG. 7 is a diagram for explaining a problem of a conventional oil applying device.

[Explanation of symbols]

1 coating device 2 Cylindrical part 3 object (or sintered body) 4 outer peripheral surface 5 Oil application means 6 Refueling means 7 rotation means 8a, 8b split segment 9 Inner peripheral surface of oil application member 10 Holder with spring relief 11 Oil coating member 12 Oil application cylinder 13 Shaft of oil application cylinder 14 jig 15 injection needle 16 syringes 17 3-jaw chuck 18 rotary cylinder 19 Stamping machine Position of 20-segment segment 21,22 arrow direction 23 oil drops

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Claims (7)

[Claims] 1. A device for applying a lubricating oil to an outer peripheral surface of an object having a cylindrical portion, comprising two divisions made of a porous material capable of coalescing and separating around the cylindrical portion of the object. An oil application means having an oil application member formed of a segment and forming a ring-shaped inner peripheral surface that comes into contact with the outer peripheral surface of the cylindrical portion of the object by combining the divided segments; Lubricating oil on the outer peripheral surface of an object having a cylindrical portion, characterized in that it comprises an oil supply means for supplying a fixed amount of oil to the segment, and a rotating means for rotating at least one of the object and the oil applying member. A device for uniformly applying. 2. The device for uniformly applying lubricating oil to the outer peripheral surface of an object having a cylindrical portion according to claim 1, wherein the oil supply means is a syringe, a dropper or a nozzle. 3. The object according to claim 1, which is a sintered body.
An apparatus for uniformly applying a lubricating oil to the outer peripheral surface of an object having a cylindrical portion as described. 4. The device for uniformly applying lubricating oil to the outer peripheral surface of an object having a cylindrical portion according to claim 1, 2 or 3, wherein the porous material forming the divided segments is a sponge. 5. The cylindrical shape according to claim 1, wherein the rotating means for rotating the object is a rotary cylinder having a plurality of clamp members for supporting the object from the inner peripheral surface side thereof. A device that evenly applies lubricating oil to the outer peripheral surface of an object having parts. 6. An apparatus for uniformly applying a lubricating oil to the outer peripheral surface of an object having a cylindrical portion according to claim 1, wherein the lubricating oil has a viscosity of 30 cSt or more. 7. A method for applying lubricating oil to an outer peripheral surface of an object having a cylindrical portion by using the apparatus according to claim 1, wherein the two oil-applying members are provided. After supplying a certain amount of lubricating oil to the divided segments by the oil supply means in the separated state, these divided segments are united around the cylindrical portion of the object, and oil is applied to the outer peripheral surface of the cylindrical portion of the object. Lubricating oil is applied by bringing the inner peripheral surfaces of the members into contact with each other, then the oil applying member is separated into two divided segments, and then the object is rotated by a predetermined angle, and a certain amount of lubricating oil is applied by the oil supply means. Feeding two segments, then merging the two segments around a cylindrical object,
It has a cylindrical portion, characterized in that after the inner peripheral surface of the oil applying member is brought into contact with the outer peripheral surface of the cylindrical portion of the object and the lubricating oil is applied again, the oil applying member is separated into two segments. A method of uniformly applying lubricating oil to the outer peripheral surface of an object.