Gear cutting – milling – or planing – Milling – With means to control temperature or lubricate
Reexamination Certificate
2001-10-22
2004-08-10
Ross, Dana (Department: 3722)
Gear cutting, milling, or planing
Milling
With means to control temperature or lubricate
C409S135000, C408S056000, C408S057000, C184S055100, C239S423000
Reexamination Certificate
active
06773212
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a cutting-oil coater for applying cutting-oil to a workpiece or a tool during cutting and a cutting device.
2. Description of the Prior Art
Hitherto, cutting-oil has been applied to a target object, a tool, or the like in order to improve machining accuracy and to extend tool life. When applying oil in a state of droplet, cutting can be carried out with only a necessity minimum amount of oil, thus not only improving machining accuracy and productivity, but also leading to improving a working environment and the simplification of a plant and equipment.
FIG. 6
is a view showing the configuration of one example of a conventional cutting-oil coater. Reference numeral
50
denotes a spray feed device for feeding an oil spray (liquid fine particles of oil). The spray conveying device includes a container
51
forming a main body. The container
51
is provided with a spray discharge nozzle
52
, an air discharge nozzle
53
, a spray conveying pipe
54
and an oil feed port
55
. The air discharge nozzle
53
, which is used to feed the container
51
with air, is connected to a gas source
56
. The flow rate of the discharged air can be regulated by an air flow rate regulating valve
58
b.
The spray conveying pipe
54
is used to convey oil spray inside the container
51
to the outside of the container
51
. The oil spray is injected into the container
51
from a nozzle tip portion
52
c
of the spray discharge nozzle
52
. The spray discharge nozzle
52
has a dual structure formed of a gas tube
52
a
and an oil tube
52
b
that extends inside the gas tube
52
a
. The gas tube
52
a
is connected to a gas source
56
. The flow rate of discharging gas can be regulated by a gas flow rate regulating valve
58
a
. The oil tube
52
b
is connected to an oil pump
57
. The flow rate of oil from the pump
57
can be regulated by an oil flow rate regulating valve
59
.
At the nozzle tip
52
c
, oil fed from the oil pump
57
and gas fed from the gas source
57
are mixed with each other, and thus oil spray is produced and injected into the container
51
. The air pressure from the spray discharge nozzle
52
is applied to the inside of the container
51
, so that fine oil spray residing in the container
51
is affected by the pressure applied and is conveyed to the spray conveying pipe
54
. Furthermore, the gas discharged from the air discharge nozzle
53
can increase the internal pressure in the container
51
.
The oil spray passing through the spray conveying passage
54
finally is discharged from a tip
63
having a narrower diameter. Thereby, the flow velocity of the oil spray increases, and the oil spray is discharged in a state in which it is liquefied in a state of an oil droplet so that it can be attached to a workpiece. This discharged flow can be used as a lubricant in cutting.
The oil
62
inside the container
51
flows into the pump
57
via the oil feed port
55
and is used for producing oil spray. The oil
62
also includes the oil that has dropped inside the container
51
and has not flowed into the conveying passage
54
. The container
51
also serves as an oil storage portion. Oil can be refilled into the container from an oil feed port
61
by uncapping an oil-refilling cap
60
.
However, the above-mentioned conventional cutting-oil coater has following problems. As mentioned above, the container
51
serves as an oil storage portion, and the oil pump
57
and various regulating valves are also arranged together with the container
51
. When such a device is attached to a machining tool, to take the convenience in oil-refilling or regulation of the flow rate into account, such a device is attached to, for example, a side of the machining tool that faces an aisle. Thereby, in general, the distance between the oil coater main body and a position for cutting is increased, and thus the total length of the conveying passage
54
also is increased.
In this case, since the conveying passage
54
is provided in accordance with the shapes of the various portions of the machining tool, the conveying passage
54
has a large number of bend portions between the container
51
and the discharge portion
63
. The presence of the bend portions causes turbulence in the oil spray during conveying. As a result, a part of fine oil spray is liquefied. Such a liquefaction of the oil spray may cause clogging in the conveying passage
54
, thus preventing the conveying of the oil spray.
One of the measures taken for solving such problems may be to take a specification of the shapes of the various portions at the side of the machining tool so that the bend portions in the conveying passage
54
are reduced. In this case, the specification of the machine tool is limited as well as the machining tool becoming larger. Furthermore, space for providing the machining tool has to be increased, which is not realistic.
Furthermore, if the coater itself is provided in the vicinity of cutting portion, the above-mentioned problem is solved. However, in this case, the oil supply becomes inconvenient and the regulation of the device or checking of operation becomes inconvenient. For example, when the coater is provided at a high place in the large size machining tool, work such as an oil supply becomes extremely difficult.
SUMMARY OF THE INVENTION
With the foregoing in mind, it is an object of the present invention to provide a cutting-oil coater capable of preventing the liquefaction of oil spray during conveying and improving the efficiency of work, for example, oil-refilling, etc. by forming a spray feed portion and an oil storage portion separately and enabling the arrangement position thereof to be regulated.
In order to achieve the above-mentioned object, a cutting-oil coater of the present invention includes a spray feed portion, an oil storage portion for storing oil to generate spray, an oil feed means for feeding oil in the oil storage portion to the oil spray feed portion, and a spray conveying passage for conveying the oil spray inside the spray feed portion to the outside of the spray feed portion, wherein the spray feed portion and the oil storage portion are formed separately from each other and can be remote arranged in different positions respectively, and the arrangement position can be adjusted. With such a cutting-oil coater, since the spray feed portion can be attached in the vicinity of the cutting portion and the oil storage portion can be disposed in a place where an oil-refilling work can easily be carried out, it is possible both to prevent liquefaction of the oil spray during conveying and to improve the efficiency of work such as an oil-refilling.
It is preferable that the above-mentioned cutting-oil coater further includes a return passage for allowing the oil in the spray feed portion to return to the oil storage portion. With such a cutting oil coater, oil can be reused.
Furthermore, it is preferable that the pressure inside the spray feed portion is higher than the pressure inside the oil storage portion, and the oil inside the return passage is conveyed to the oil storage portion due to the difference between the pressure inside the spray feed portion and the pressure inside the oil storage portion. With such a cutting-oil coater, since it is not necessary to use an oil pump etc. for conveying a returning oil and it is not necessary to use the gravity drop for return of oil, the degree of freedom in the arrangement of the return passage is enhanced.
Furthermore, it is preferable that an inlet of the return passage in the spray feed portion is an orifice with a narrower diameter with respect to the return passage. With such a preferred cutting-oil coater, it is possible to reduce the gas flow rate inside the spray feed portion while conveying oil to the oil storage portion.
It is preferable that the inlet of the return passage has a narrower diameter portion whose cross-sectional area is in the range from 0.05 mm
2
to 0.15 mm
2
. With such a cutting-oil coater it is possible to
Fuji Koeki Co., Ltd.
Jordan and Hamburg LLP
Ross Dana
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