JP2006082152A - Method and device for feeding mist - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the quantity of lubricant unnecessarily used in spraying/feeding oil mist to a worked object. <P>SOLUTION: In the method of feeding mist for spraying the mist with drips blended in a gas flow to an object to be sprayed which relatively moves, the gas flow is continuously sprayed to the object to be sprayed through a continuous gas supply pipe 1, and the mist is intermittently sprayed through a mist supply pipe 9. The mist is sprayed at such intervals that the mist adhesion area in the object to be sprayed by each spray does not overlap with the area by the previous spray or before that. A liquid coat is securely formed on the object to be sprayed by the mist supply, and the quantity of the material for drips used for generating mist is reduced. When the object to be sprayed is worked, the working waste can be removed and the working point can be cooled with the continuous gas flow. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a mist supply method and apparatus capable of efficiently injecting and supplying oil mist to a processed surface during semi-dry processing or the like.

In machining such as cutting, lubrication and cooling of the tool cutting edge is a very important problem in terms of tool life, and conventionally, a large amount of water-soluble or oil-based machining fluid has been supplied to the machining point. However, the method of supplying a large amount of processing liquid not only increases the cost of the oil agent but also causes problems such as waste liquid treatment and environmental deterioration due to spoilage, and the adoption results are decreasing.
For this reason, at present, for the purpose of reducing the amount of oil used, “semi-dry processing” in which a minute amount of cutting oil is atomized and sprayed onto the processing point together with compressed air is often used. In semi-dry processing, the amount of oil used is very small, about 10 cc / h to 100 cc / h, but depending on the processed product, the amount of oil is increased. In the case of semi-dry processing, the oil agent is sprayed in the form of a mist, but it is sprayed from the nozzle at the end of the lubricating oil device, sprayed from the nozzle at the tip after being transported to the processing point by piping with compressed air There are two methods of transporting air and oil to different nozzles, generating mist at the nozzle part, and spraying it.
As mentioned above, in semi-dry processing, the amount of oil used is small, but in the case of difficult-to-cut materials and processing that generates a lot of heat, the fact is that a large amount of mist is supplied to ensure the tool life. Furthermore, it is desired to reduce the amount of oil used.
For example, as a measure for reducing the amount of oil used, there has been proposed one that intermittently supplies air for supplying mist and supplies lubricating oil on the premise of continuous injection of mist from a nozzle (Patent Document 1). reference).
JP 2002-181284 A

However, even when adopting the above-mentioned measures to reduce the amount of oil used, when looking at the tool trajectory in actual machining, even if there are few overlapping machining areas, the oil mist that spreads in a fan-like shape will have the same location. It will be sprayed in duplicate, and the oil agent equivalent to the frequency | count of duplication will adhere to the part.
5 and 6 are views showing a spray state during semi-dry processing, and the cutting blade 25 and the injection nozzle 26 are moved relative to the workpiece 20 with respect to the workpiece 20 (in FIG. The cutting process is performed while making the horizontal direction in FIG. At this time, as shown in FIG. 5, the oil mist 27 is sprayed in a fan shape from the spray nozzle 26, and as the spray nozzle 26 moves, the oil mist adhesion region 28 on the workpiece 20 is as shown in FIG. It will be long. In the oil mist injection, there is a problem that the adhering regions are overlapped by continuous injection, and the lubricating oil is consumed wastefully. For example, in the case of long-time mold processing or the like, an oil agent layer is formed thick on the processed surface, and excessive supply of lubricating oil is observed. Further, as a result of the oil mist injection being diffused, the useless adhesion region 28a that is not a processing target as shown in FIG.

  The present invention has been made against the background of the above circumstances, and an object thereof is to provide a mist supply method and apparatus capable of effectively injecting mist without waste and supplying the mist to an injection target.

  That is, among the mist supply methods of the present invention, the invention according to claim 1 is the mist supply method for injecting the mist, in which droplets are mixed in the gas flow, to the relatively moving object to be injected. A gas flow is continuously injected to an object and the mist is injected intermittently, and the intermittent injection of the mist is caused by the relative movement of the object to be injected in each injection of the object. The mist adhesion region is performed at an interval that does not overlap at least with the previous injection.

  The invention of the mist supply method according to claim 2 is the mist supply method according to claim 1, wherein the mist is an oil droplet, and the mist supply method injects the mist to the workpiece that is an injection target. The intermittent injection of mist is characterized in that the next injection is performed when the processing progresses in 80% or more of the area of the mist adhered to the workpiece in the previous injection.

  The invention for a mist supply method according to claim 3 is the gas according to claim 1 or 2, wherein the gas is continuously ejected by mixing a gas flow continuously ejected onto the object to be ejected and liquid droplets. A gas flow to be combined with the flow, and intermittent injection of the mist is performed by intermittently supplying a gas flow in which the droplets are mixed.

  The invention of the mist supply method according to claim 4 is the invention according to any one of claims 1 to 3, wherein the gas flow mixed with droplets is branched and increased in pressure by the gas flow for continuous injection. It is characterized by being.

  Further, the invention of the mist supply device according to claim 5 is a continuous air supply pipe through which a gas flow is continuously supplied, a gas supply pipe for mist through which a gas flow mixed with droplets is supplied, and the mist supply apparatus. Mist generating means for generating mist by a gas flow supplied by an air supply pipe, a mist air supply pipe for supplying mist generated by the mist generation means, a gas flow supplied by the continuous air supply pipe, and mist supply It is characterized by comprising a nozzle capable of joining the mist fed by the trachea and ejecting it to the outside, and an intermittent air feeding means for intermittently feeding the gas flow mixed with the droplets.

  According to a sixth aspect of the present invention, there is provided the mist supply device according to the fifth aspect, wherein the mist air supply pipe is branched from the continuous air supply pipe, and the gas flow is increased upstream of the mist generating means. It is characterized by comprising a pressure increasing means for pressing.

  According to the present invention, when the mist is intermittently injected, the mist layer is not overlapped with the previous mist (excluding the previous one) injection, so that there is no triple overlap of the mist layers, which is useless. The consumption of mist can be avoided as much as possible. In the present invention, the overlap with the mist adhesion amount region by the previous injection is allowed, but it is desirable to make the overlap range as small as possible. For example, in the relative movement direction of the injection target, the overlapping length with the previous region is set to be 30% or less (more preferably 20% or less). In short, it is desirable to reduce the overlapping range within a range in which the object to be ejected can be adhered to the surface to be adhered. It is also possible to perform intermittent injection so that it does not substantially overlap with the adhesion region from the previous injection. In addition, the said duplication prescribes | regulates what is based on intermittent injection, and does not prescribe the duplication which arises when the relative moving direction of the injection position of a mist and a to-be-injected object changes.

  As described above, the present invention is suitable for an application in which oil mist is supplied as a lubricating oil to a work surface on which cutting or the like is performed. However, the present invention is not limited to this application, and can be applied to various applications in which mist needs to be supplied to an injection target. Accordingly, the type of gas flow and the type of droplet are not limited to specific ones.

  That is, according to the mist supply method of the present invention, in the mist supply method for injecting a mist mixed with droplets in a gas flow to an object to be moved relatively, the gas flow is continuously applied to the object to be injected. The mist is intermittently injected, and the intermittent injection of the mist is caused by the relative movement of the injection target so that the mist adhesion region on the injection target by each injection is at least before the previous time. Therefore, it is possible to prevent the mist from being unnecessarily ejected and the mist droplet material from being consumed more than necessary. Also, mist can be prevented from spreading to the environment. And to a to-be-injected object, mist can be reliably supplied also by intermittent injection, and a desired liquid film layer can be formed in a to-be-injected object. Further, the continuous injection of the gas flow with respect to the injection target does not have an adverse effect on the adhesion of the mist, and has an effect of eliminating the mist supply variation when the mist is intermittently injected. That is, if only mist is intermittently injected, variations in the amount of mist supplied are likely to occur immediately after injection or when injection is stopped, but the above-described adverse effects can be avoided by continuous injection of gas flow. Further, the gas flow continuously ejected onto the ejected object has an effect of effectively removing processing waste and the like generated when the ejected object is processed from the ejected object and cooling the processing point.

  Next, according to the mist supply apparatus of the present invention, a continuous air supply tube through which a gas flow is continuously supplied, a mist air supply tube through which a gas flow for mixing droplets is supplied, and the mist supply device A mist generating means for generating mist by a gas flow supplied by a trachea, a mist air supply pipe for supplying mist generated by the mist generation means, a gas flow supplied by the continuous air supply pipe, and a mist air supply pipe In this way, the mist is supplied intermittently, and the nozzle that can be jetted to the outside by merging with the mist that is fed in and the intermittent air feeding means that intermittently feeds the gas flow that mixes the droplets. The above-described effect due to the intermittent injection of mist is obtained by the operation.

Below, one Embodiment of the mist generator of this invention is described based on FIGS. 1-4.
One end of the continuous air supply pipe 1 is connected to a factory pressure air circuit or the like to which compressed air is supplied, and the other end is connected to the injection nozzle 2. In addition, the supply source of air is not specifically limited as this invention, The said factory pressure air circuit is an example of an air supply source.

On the upstream side of the continuous air supply pipe 1, a mist generating air supply pipe 3 branches from the continuous air supply pipe 1, and an air booster 4 as a pressure increasing means is interposed in the mist generating air supply pipe 3. Yes. An accumulator 5 for temporarily accumulating air is provided on the downstream side of the air booster 4, and an ON-OFF valve 6 is provided on the downstream side thereof. On the downstream side of the ON-OFF valve 6, a lubricating oil supply pipe 7 is connected to the air supply pipe 3 for generating mist, and the connecting portion serves as a mist generating portion 8 corresponding to mist generating means. The mist generating unit 8 may have a structure using a differential pressure between the mist generating air supply pipe 3 and the lubricating oil supply pipe 7, for example. The lubricating oil supply pipe 7 is connected to a lubricating oil supply source (not shown). The oil agent used for the supply source is preferably one having a relatively high viscosity, but one that does not easily form mist is inappropriate, and an appropriate oil agent is selected.
One end of a mist air supply tube 9 is connected to the mist generating section 8, and the other end of the mist air supply tube 9 is connected to the injection nozzle 2. In the injection nozzle 2, the gas flow supplied from the continuous air supply pipe 1 and the mist supplied from the mist air supply pipe 9 merge and can be injected to the outside. The mist generator 8 may be provided in the injection nozzle 2.

  The lubricating oil supply pipe 7 is provided with a metering valve 10 that determines the amount of discharged lubricating oil by one injection. Further, the mist generator includes an intermittent injection control unit 11 for intermittently injecting mist, and a command from the intermittent injection control unit 11 is transmitted to the ON-OFF valve 6 and the metering valve 10 described above. It is configured as follows. That is, the intermittent injection control unit 11 and the ON-OFF valve 6 constitute the intermittent air supply means of the present invention.

Next, the operation of this mist generator will be described. This operation corresponds to an embodiment of the mist supply method of the present invention.
As shown in FIG. 2, compressed air is supplied to the continuous air supply pipe 1 in accordance with the processing timing. Then, the compressed air is jetted from the jet nozzle 2 to the workpiece 20 as the jetted object through the continuous air supply pipe 1. On the other hand, the compressed air is also supplied to the air supply pipe 3 for generating mist. After the pressure is increased by, for example, 2 to 3 times by the air booster 4, the compressed air is accumulated in the accumulator 5. The high-pressure air may be accumulated in the accumulator 5 in advance before the processing timing. In FIG. 2, the supply of compressed air to the continuous air supply pipe 1 is indicated by air ON.

In the intermittent injection control unit 11, the discharge time and the injection interval in the intermittent injection are set in advance according to the moving speed of the injection nozzle 2 and the cutting blade 25, and the setting may be adjustable. In this intermittent injection control 11, the oil adhesion area to the workpiece of each injection is set so as not to overlap with the previous injection. The intermittent injection control part 11 can mainly comprise, for example, a CPU and a program for operating the CPU.
The intermittent injection control unit 11 sends a discharge command to the ON-OFF valve 6 and the metering valve 10 at predetermined intervals for a predetermined time according to the above setting. In the ON-OFF valve 6, the valve is opened for a predetermined time (for example, 0.1 to 1 second). Then, the high-pressure air accumulated in the accumulator 5 is sent to the downstream side of the mist generating pipe 3 through the ON-OFF valve 6 at a stretch. Also in the lubricating oil supply pipe 7, the metering valve 10 is opened by the intermittent injection control unit 11, and a fixed quantity of lubricating oil is supplied from a lubricating oil supply source (not shown) to fill the lubricating oil supply pipe 7. That is, as shown in FIG. 2, high pressure air and lubricating oil are supplied by the above command. In FIG. 2, the supply of high-pressure air is expressed as hydraulic air ON, and the supply of lubricating oil is expressed as lubricating oil ON.

  When the above-described high-pressure air reaches the mist generating section 8, the above-described fixed amount of lubricating oil is drawn into the high-pressure air in the form of droplets from the lubricating oil supply pipe 7 and becomes a mist. This mist is supplied to the injection nozzle 2 through the mist supply pipe 9 according to the movement of the high-pressure air, and as shown in FIG. 3B, the surface of the workpiece 20 such as a mold together with the continuous air described above. To form a lubricating oil film. In addition, since the discharge time of mist also depends on the hole diameter at the tip of the injection nozzle, the discharge time can be adjusted by adjusting the hole diameter.

  After the above-described one-time discharge is performed and the lubricating oil film is formed on the adhesion region 29 on the surface of the workpiece 20, the ON-OFF valve 6 and the metering valve 10 are closed by a command from the intermittent injection control unit 11, Air supply for oil mist and supply of lubricating oil are interrupted for a predetermined time as shown in FIG. At this time, as shown in FIG. 3A, only continuous air is injected from the injection nozzle 2 onto the workpiece 20, but an adverse effect on the lubricating oil film formed by intermittent injection has occurred. Absent. At this time, in the air supply pipe 3 for generating mist, the air is increased in pressure by the air booster 4, and the increased high-pressure air is accumulated in the accumulator 5. The accumulated amount can be intermittently supplied by adjusting a desired amount (including a constant amount) of air each time.

  When the set interval elapses, the intermittent injection control unit 11 opens the ON-OFF valve 6 and the metering valve 10 again, and discharges oil mist for a predetermined time in the same manner as described above. The intermittent operation can be set so that one shot is ejected every 0.5 to 5 minutes, for example, depending on processing conditions. By repeating the above operation, air can be continuously injected and oil mist can be intermittently injected. Note that FIG. 2 also shows a timing chart of a conventional injection method, in which oil mist is continuously injected by continuously supplying air and lubricating oil.

FIG. 4 shows a state in which oil mist is sprayed and cut while moving the spray nozzle 2 and the cutting blade 25 in the longitudinal direction of the workpiece 20 during the intermittent spraying of the mist. It can be seen that in each injection, the oil mist adhesion region is injected at an interval that does not overlap with the previous one. In this intermittent injection, each injection is performed in a state slightly overlapping with the previous adhesion region, and in this example, 20% of the adhesion region overlaps in the moving direction.
In this example, the next oil mist is sprayed after the cutting process has progressed in 80% of the previous adhesion area. This is because if the next injection is performed before reaching 80%, unnecessary double injection occurs and the amount of lubricating oil consumed increases.
Further, even in the intermittent injection of oil mist, the oil mist is diffused and a wasteful adhesion region is generated. However, as shown in FIG. 3, since only the air is injected, the lubricating oil is not injected. In addition, the formation of a useless adhesion region accompanying the relative movement of the workpiece is reduced. Even in the state where only air is sprayed, the tool and the machining point can be effectively cooled, and there is an effect of sufficiently removing machining waste.
As mentioned above, although one Embodiment of this invention was described, this invention is not limited to description of the said embodiment, In the range of this invention, it can change suitably.

It is a lineblock diagram showing the mist generating device of one embodiment of the present invention. Similarly, it is a figure which shows the timing chart at the time of oil mist generation | occurrence | production. Similarly, it is a figure which shows the state which is performing the intermittent injection of oil mist with respect to a workpiece. Similarly, it is a figure which shows the adhesion area | region and intermittent spraying timing at the time of performing the intermittent injection of oil mist with respect to a workpiece. It is a figure which shows the state which is performing the intermittent injection of oil mist with respect to a workpiece by the conventional method. Similarly, it is a figure which shows the adhesion area | region and continuous spray timing at the time of performing intermittent injection of oil mist with respect to a workpiece.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Continuous air supply pipe 2 Injection nozzle 3 Air supply pipe for mist generation 4 Air booster 5 Accumulator 6 ON-OFF valve 7 Lubricating oil supply pipe 8 Mist generation part 9 Mist air supply pipe 10 Metering valve 11 Intermittent injection control part

Claims (6)

In a mist supply method for injecting a mist in which droplets are mixed into a gas flow with respect to an object to be moved relatively,
The gas flow is continuously injected to the injection target object, the mist is intermittently injected, and the intermittent injection of the mist is performed according to the relative movement of the injection target object by each injection. A method for supplying mist, characterized in that the mist adhesion region on the object is performed at an interval that does not overlap at least with the previous injection.   A mist supply method for injecting a mist whose droplets are oil droplets onto a workpiece that is an object to be ejected, wherein the mist is intermittently ejected in a region of the mist that has adhered to the workpiece by the previous injection. The mist supply method according to claim 1, wherein the next injection is performed when the processing progresses at 80% or more.   There is a gas flow that is continuously injected to the object to be injected, and a gas flow that is mixed with a gas flow that mixes the droplets and performs the continuous injection, and the gas flow that mixes the droplets is intermittently supplied. The mist supply method according to claim 1, wherein intermittent injection of the mist is performed.   The mist supply method according to any one of claims 1 to 3, wherein the gas flow mixed with droplets is obtained by branching and increasing the pressure of the gas flow for continuous injection.   A mist is generated by a continuous air supply tube through which a gas flow is continuously supplied, a mist air supply tube through which a gas flow for mixing droplets is supplied, and a gas flow supplied through the mist air supply tube. The mist generating means, the mist air supply pipe for supplying the mist generated by the mist generating means, the gas flow supplied by the continuous air supply pipe and the mist supplied by the mist air supply pipe are joined to the outside. A mist supply device comprising: an injectable nozzle; and intermittent air supply means for intermittently supplying a gas flow in which the droplets are mixed.   6. The mist supply device according to claim 5, wherein the air supply pipe for mist is branched from the continuous air supply pipe, and further includes a pressure increasing means for increasing a gas flow upstream of the mist generating means.

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