JP2011056367A - Treating method and apparatus for reducing amount of processing oil adhered to workpiece - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the amount of a processing oil adhered to and remaining on a workpiece during processing by a simple method, make the removed processing oil reusable, reduce the running cost by reducing or eliminating the need of a cleaning solution to clean the workpiece and mitigate the load to the global environment. <P>SOLUTION: The treating method comprises heating the same processing oil 4 as that used in processing the workpiece 12 to a temperature higher than the oil temperature during processing so as to lower the viscosity and bringing the heated processing oil 4 into contact with the workpiece 12 adhered with the processing oil during processing to lower the viscosity of the processing oil adhered to the workpiece 12 so as to reduce the amount of the processing oil adhered. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a processing method and apparatus for reducing the amount of residual working oil adhering to a workpiece during the processing of the workpiece such as cutting, grinding, pressing, drawing, punching, drawing, and forging. It is about.

  Conventionally, when processing a workpiece such as cutting, grinding, pressing, drawing, punching, drawing, forging, etc., the processing oil is attached to the workpiece for the purpose of suppressing friction or cooling. Therefore, a large amount of processing oil remains on the workpiece after the processing operation. The processing oil adhering and remaining on the workpiece needs to be removed or reduced from the surface of the workpiece in preparation for use in the next step. Therefore, as shown in Patent Document 1, cleaning oil is removed from the surface of the workpiece by spraying a cleaning solvent on the workpiece after the above-described processing work or immersing the workpiece in the cleaning solvent. The work to do is generally done.

JP 2001-246335 A

  Conventionally, when cleaning the workpiece as described above, the workpiece to which the processing oil is adhered by the processing operation is put into the cleaning machine as it is, and spray cleaning or immersion using the cleaning solvent as described above is performed. We were cleaning. For this reason, all the processing oil adhering to the workpiece by the machining operation is removed from the workpiece together with the cleaning solvent by the above-mentioned washing operation and taken out, and the consumption of the processing oil becomes intense and the running cost increases. The load on the environment was also high.

  In addition, a large amount of cleaning solvent is required to remove the above large amount of processing oil in order to clean the workpiece in which a large amount of processing oil adheres and remains as it is due to processing operations. Running cost was high. In addition, as described above, by washing a workpiece on which a large amount of processing oil is adhered and remaining with a cleaning solvent, a large amount of processing oil is mixed into the cleaning solvent, which increases the contamination rate of the cleaning solvent. Accordingly, the frequency of replacement of the cleaning solvent is increased, and the running cost is also increased in this respect.

  Accordingly, the present invention is intended to solve the above-described problems. The processing oil adhering to the workpiece by the machining operation is reduced and removed by a simple method so that it can be reused. It is intended to reduce the running cost and reduce the burden on the global environment by reducing the cleaning solvent required for cleaning the workpiece or reducing it to zero in some cases.

  In order to solve the problems as described above, the present invention reduces the viscosity by heating the same processing oil as the processing oil used in the processing operation of the workpiece to a temperature higher than the oil temperature during the processing operation. By bringing the processed oil into contact with the workpiece to which the processing oil is adhered by the processing operation, the viscosity of the processing oil adhering to the workpiece is lowered, and the amount of adhesion is reduced.

  In addition, the apparatus for carrying out the above-described method is a storage tank that stores a workpiece to which the processing oil is attached by a processing operation and that can be contacted with the same processing oil as the processing oil used for the processing operation of the workpiece. And a heating mechanism that is disposed inside or outside the storage tank and reduces the viscosity by heating the same processing oil to a temperature higher than the oil temperature of the processing oil at the time of processing the workpiece. Then, by bringing the workpiece to which the processing oil is adhered into contact with the heated processing oil, the viscosity of the processing oil that has adhered to the workpiece is reduced, and the amount of adhesion can be reduced.

  Further, the contact between the heated processing oil and the workpiece may be performed as a pre-process of a cleaning process using a degreasing cleaner. In this case, cleaning with a degreasing machine is performed after the viscosity of the processing oil adhering to the workpiece is lowered by contact with the heated processing oil and the residual amount of adhesion is reduced. Therefore, it is possible to facilitate the cleaning by the degreasing cleaner as compared with the case where the workpiece after the processing work is put into the degreasing cleaner as it is, and the cleanliness of the workpiece after the degreasing cleaning is achieved. It is also possible to increase. Further, as described above, by reducing the amount of residual processing oil adhered to the workpiece before degreasing, it is possible to reduce the amount of cleaning solvent used for degreasing the workpiece. Therefore, it is possible to reduce the cost of degreasing and cleaning.

  Further, the heated processing oil may be cooled and reused for processing the workpiece. In the present invention, since the processing oil used for processing the workpiece and the heated processing oil are the same, even if the processing oil remaining on the workpiece is mixed into the heated processing oil, it is the same. It can be easily reused as a processing oil.

  The heating of the processing oil and the contact between the heated processing oil and the workpiece may be performed in an inert gas atmosphere such as nitrogen gas or argon gas. In the present invention, as described above, the processing oil is heated and used, and some processing oils are likely to be oxidized and deteriorated by heating in this way. Therefore, in the case of using processing oil that easily undergoes oxidative degradation due to heating as described above, by heating the processing oil and contacting the heated processing oil and the workpiece in an inert gas atmosphere, Since it is possible to block the contact between the processing oil and the atmosphere with an inert gas such as nitrogen gas or argon gas, it becomes possible to suppress the oxidative deterioration of the processing oil and to recycle the processing oil repeatedly. Is possible.

  Further, the heating temperature of the processing oil may be 50 ° C to 200 ° C. The processing oil is usually used for cooling the processed portion, and the temperature may rise to nearly 50 ° C. during processing due to heat exchange with the processed portion. Therefore, if the heating temperature of the processing oil is less than 50 ° C., the heating temperature may be lower than the oil temperature of the processing oil at the time of the processing operation, and in this case, the processing oil is attached to the surface of the workpiece. There is a possibility that the viscosity of the processing oil cannot be lowered sufficiently and the amount of the processing oil deposited cannot be reduced sufficiently. Further, when the heating temperature of the processing oil exceeds 200 ° C., the processing oil is thermally deteriorated due to overheating, and it becomes difficult to reuse the processing oil, and there is a possibility of ignition.

  Further, when the heated processing oil and the workpiece are in contact, the workpiece is rotated, oscillated, ultrasonic vibration, applied to the workpiece while the workpiece is immersed in the heated processing oil. One or a plurality of means for injecting the processing oil or injecting the processing oil heated to the workpiece not immersed in the processing oil may be selectively used. In this case, when the heated processing oil and the workpiece are in contact with each other, the above-described physical force is applied to the workpiece, thereby further reducing the weight loss efficiency of the adhered processing oil and the processing waste from the workpiece. It becomes possible to raise.

  The present invention is configured as described above, and the oil of the processing oil attached to the workpiece is lowered by bringing the heated processing oil into contact with the workpiece and reducing the viscosity of the processing oil attached to the workpiece. This makes it possible to cut well and reduce the amount of residual processing oil adhering to the workpiece without using a cleaning solvent. In addition, by reducing the viscosity of the adhering processing oil as described above and improving its oil drainage, it is possible to reduce the adhesion amount of chips and other processing debris adhering to the workpiece by processing operations. It is what.

  Therefore, by performing the treatment process of the present invention before the cleaning operation using the cleaning solvent, the amount of the cleaning solvent used can be reduced compared to the case where the workpiece after the processing operation is cleaned as it is using the cleaning solvent. The workpiece can be easily cleaned to a high cleanliness while reducing the running cost of cleaning. In addition, if precision cleaning is not required, it is possible to dry the work piece as it is without performing cleaning work using a cleaning solvent after the treatment process of the present invention, and to move to the next process. In this case, no cleaning solvent is required, and the cleaning process can be simplified and the running cost can be reduced.

In addition, the processing oil adhered to the workpiece is mixed with the heated processing oil by contacting the workpiece to which the processing oil is adhered by the processing operation with the heated processing oil, but both are the same processing oil. Therefore, it can be easily reused as it is. Therefore, compared with the case where all the processing oil adhering to the workpiece is removed by the cleaning solvent, the consumption of the processing oil can be reduced and the running cost can be reduced. Further, by making it possible to reuse the processing oil adhering to the workpiece, it is possible to reduce the amount of CO ₂ emission and to reduce the burden on the global environment.

1 is a conceptual diagram illustrating Example 1. FIG. The graph which shows transition of the oil temperature of process oil and the residual rate of adhesion process oil in Examples 1-3. FIG. 9 is a conceptual diagram illustrating Example 4; FIG. 9 is a conceptual diagram illustrating Example 5.

  Embodiment 1 of the present invention will be described in detail with reference to the drawings. (1) is a storage tank, and an upper entrance / exit (2) is covered with a lid (3) so as to be opened and closed. In this storage tank (1), the processing oil (4) is stored as shown in FIG. 1, and the processing oil (4) can be heated by the heating mechanism (5) disposed in the storage tank (1). It is said. In addition, a temperature sensor (9) is disposed in the storage tank (1), and a processing oil tank (8) is connected via an overflow pipe (7) provided with a first on-off valve (6). The storage tank (1) is provided with a first liquid level sensor (16). When the liquid level of the processing oil (4) in the storage tank (1) becomes equal to or higher than a certain level, the first liquid level sensor (16) is provided. The first on-off valve (6) is opened by a signal from the liquid level sensor (16), and the processing oil (4) can be introduced into the processing oil tank (8) via the overflow pipe (7). Moreover, the inlet (10) for inject | pouring inert gas, such as nitrogen gas and argon gas, is connected to the storage tank (1) through the 2nd on-off valve (11).

  In the configuration as described above, in order to reduce the amount of processing oil adhering to the workpiece (12) by the processing operation, the processing oil (4) of the same type as the processing oil used for the processing operation is stored. The same kind of processing oil (4) is stored in the tank (1) and heated to a temperature higher than the oil temperature of the processing oil during the processing operation by the heating mechanism (5). Then, the workpiece (12) to which the processing oil is adhered by the machining operation is introduced into the storage tank (1) from the entrance (2) where the lid (3) is opened, and the lid (3) is closed. Then, the workpiece (12) is immersed in the heated processing oil (4) in the storage tank (1) as shown in FIG. By soaking the workpiece (12) in the heated processing oil (4) in this way, the processing oil attached to the workpiece (12) is heated and its viscosity is lowered. Then, with the viscosity of the processing oil adhering to the workpiece (12) lowered, the workpiece (12) is pulled up from the processing oil (4) as shown by a two-dot chain line in FIG.

  In this way, the workpiece (12) is pulled up from the heated processing oil (4) in a state where the viscosity of the processing oil adhered to the workpiece (12) is lowered, thereby giving the workpiece (12) It is possible to improve the drainage of the attached processing oil, and to reduce the residual amount of the processing oil attached to the workpiece (12) without using a cleaning solvent. Further, by reducing the viscosity of the processing oil adhering to the workpiece (12) as described above to improve the oil drainage, it is possible to remove chips and other adhering to the workpiece (12) by the processing operation. It becomes possible to reduce the adhesion amount of processing waste.

  Therefore, by performing the treatment process of the present invention before the cleaning operation using the cleaning solvent, compared with the case of cleaning the workpiece (12) after the processing operation as it is using the cleaning solvent, The work piece (12) can be easily cleaned to a high cleanliness while reducing the amount used, and the running cost of cleaning can be reduced. For example, if the treatment process of the present invention is performed as a pre-process of a cleaning process using a degreasing cleaner (not shown), the cleaning operation by the above-described degreasing cleaner can be facilitated. The cleanliness of the workpiece (12) after washing can also be increased.

  If precision cleaning is not required, the workpiece (12) can be directly dried with hot air and transferred to the next step without performing a cleaning operation using a cleaning solvent after the processing step of the present invention. In this case, no cleaning solvent is required, so that the cleaning process can be simplified and the running cost can be reduced.

Further, as described above, when the workpiece (12) to which the processing oil is adhered by the processing operation is brought into contact with the heated processing oil (4), the processing oil adhered to the workpiece (12) by the processing operation is stored in the storage tank. It mixes with the processing oil (4) in (1), and the amount of processing oil (4) in the storage tank (1) increases. This increased amount of processing oil (4) flows into the processing oil tank (8) through the overflow pipe (7) with the first on-off valve (6) opened. In the present invention, as described above, since the heated processing oil (4) in the storage tank (1) and the processing oil used for the processing operation are of the same type, the inside of the processing oil tank (8) By cooling the processing oil (4) that has flowed into the workpiece using a cooling heat exchanger (not shown), the processing oil (4) can be easily reused for processing the workpiece (12) as it is. Therefore, compared with the case where all the processing oil adhering to the workpiece (12) is removed by the cleaning solvent, the consumption of the processing oil can be reduced and the running cost can be reduced. In addition, by making it possible to reuse the processing oil that has adhered to the workpiece (12), it is possible to reduce the amount of CO ₂ emission and to reduce the burden on the global environment.

  Further, in the present invention, as described above, the processing oil (4) is heated and used, and depending on the processing oil (4), some of the processing oil (4) is likely to be oxidized and deteriorated by heating. . Therefore, in the present embodiment, when the processing oil (4) is heated and when the heated processing oil (4) is in contact with the workpiece (12), the second on-off valve ( 11) is opened, and inert gas such as nitrogen gas or argon gas is introduced into the storage tank (1) from the inert gas inlet (10). By introducing the inert gas into the storage tank (1) in this way, the heating of the processing oil (4) and the contact between the heated processing oil (4) and the workpiece (12) are prevented. It becomes possible to perform in the atmosphere of active gas. For this reason, the contact between the processing oil (4) and the atmosphere can be blocked by the inert gas, and the oxidation deterioration of the processing oil (4) can be suppressed. ) Can be reused repeatedly.

  Moreover, the heating of the above-mentioned processing oil (4) is performed at a temperature higher than the oil temperature of the processing oil during the processing operation, and is preferably set to 50 ° C to 200 ° C. The processing oil is usually used for cooling the processed portion, and the temperature may rise to nearly 50 ° C. during processing due to heat exchange with the processed portion. Therefore, if the heating temperature of the processing oil (4) is less than 50 ° C., the heating temperature may be lower than the oil temperature of the processing oil during the processing operation. In this case, the heated processing oil ( Due to 4), the viscosity of the processing oil adhering to the surface of the workpiece (12) cannot be sufficiently reduced, and the amount of the processing oil attached may not be sufficiently reduced. When the heating temperature of the processing oil (4) exceeds 200 ° C., the processing oil (4) is thermally deteriorated due to overheating, making it difficult to reuse the processing oil (4) and the possibility of ignition. Also occurs.

  Further, when the workpiece (12) is immersed in the heated processing oil (4) as described above, the workpiece (12) is rotated or rocked, or ultrasonic vibration is applied to the processing oil (4). If the processing oil (4) is sprayed onto the workpiece (12), the attached processing oil and processing from the workpiece (12) with the physical force by the rotation, swing, ultrasonic vibration or jetting. It is possible to further increase the efficiency of waste reduction.

  Further, if the workpiece (12) whose adhesion amount of the processing oil is reduced by contact with the processing oil (4) as described above is further immersed in hot water, the processing oil adhered to the workpiece (12) and It is possible to further reduce the amount of processing dust attached, to facilitate the drying operation of the workpiece (12), and to increase the amount of processing oil recovered. Moreover, when ethyl alcohol or IPA is mixed with the hot water, it becomes possible to further increase the weight loss efficiency of the processing oil and processing waste adhering to the workpiece (12), and the workpiece (12) The drying operation becomes easier.

  In addition, an experiment was conducted to prove that the amount of residual processing oil adhered to the workpiece (12) can be reduced by heating the processing oil. In this experiment, an iron plate having a square shape with a surface of 100 mm × 100 mm and a thickness of 1 mm was used as the workpiece (12). Details of the processing oil (4) used in this experiment are shown in Table 1. The processing oil 1 is used in Example 1, the processing oil 2 is used in Example 2 described later, and the processing oil 3 is used in Example 3 described later.

  The experimental method of Example 1 of this experiment is as follows. First, the workpiece (12) to which the processing oil is not adhered is immersed in the processing oil (4) at normal temperature (21 ° C.) for 1 minute, and then pulled up from the processing oil (4) to perform oil removal for 3 minutes. The weight of the workpiece (12) was measured. And the weight difference of this weight and the weight before processing oil adheres was made into the amount of adhesion of processing oil in normal temperature. Next, after heating the processing oil (4) to 85 ° C., the workpiece (12) after the above oil draining is immersed in the processing oil (4) for 1 minute, and then pulled up to perform oil draining for 3 minutes. The weight of the workpiece (12) was measured. Then, the weight difference between this weight and the weight before the processing oil is attached is defined as the amount of the processing oil adhering to the heating temperature. Further, the processing oil (4) was further heated to 140 ° C. and 190 ° C., and the same measurement was performed.

  The experimental results of Example 1 of this experiment are shown in Table 2. In Example 1 and Examples 2 and 3 to be described later, the residual rate and weight loss rate of the processing oil at each oil temperature were calculated based on the amount of oil adhering at normal temperature.

  As shown in Table 2, in Example 1, when the oil temperature of the processing oil (4) was increased from 21 ° C. to 190 ° C., the residual rate of the processing oil at 21 ° C. was 100%. In addition, the residual ratio of processing oil could be reduced to 13.9%.

  The experimental method of Example 2 of this experiment is that the oil temperature of the processing oil (4) at normal temperature is 32 ° C, and the oil temperature of the heated processing oil (4) is 72 ° C, 115 ° C, and 153 ° C. Except for this, it is the same as Example 1. The experimental results of Example 2 are shown in Table 3.

  As shown in Table 3, in Example 2, when the oil temperature of the processing oil (4) was raised from 32 ° C. to 153 ° C., the residual rate of the processing oil at 32 ° C. was 100%. Furthermore, the residual ratio of the processing oil could be reduced to 61.5%.

  The experimental method of Example 3 of this experiment is that the temperature of the processing oil (4) at normal temperature is 32 ° C., and the temperature of the heated processing oil (4) is 71 ° C., 113 ° C., and 153 ° C. Except for this, it is the same as Example 1. The experimental results of Example 3 are shown in Table 4.

  As shown in Table 4, in Example 3, when the oil temperature of the processing oil (4) was increased from 32 ° C. to 153 ° C., the residual rate of the processing oil at 32 ° C. was 100%. Furthermore, the residual ratio of the processing oil could be reduced to 25.0%.

  FIG. 2 shows a graph of changes in the oil temperature of the processing oil and the residual ratio of the processing oil in Examples 1 to 3.

  As shown in FIG. 2, in all of Examples 1 to 3, by heating the processing oil (4), the residual ratio of the processing oil to the workpiece (12) was lowered. This is because the processing oil attached to the surface of the workpiece (12) comes into contact with the heated processing oil (4) in the storage tank (1), thereby causing the viscosity of the processing oil attached to the workpiece (12). This is because the removal of the processing oil adhering to the workpiece (12) is promoted. From this, it was proved that the amount of adhesion of the processing oil to the workpiece (12) can be reduced by heating the processing oil (4). Therefore, as in the present invention, by bringing the workpiece (12) to which the processing oil is adhered by the processing operation into contact with the heated processing oil (4) and heating the processing oil adhered to the workpiece (12), It was confirmed that the amount of processing oil attached to the workpiece (12) can be reduced.

  In the above-described Examples 1 to 3, the work oil (4) attached to the work piece (12) can be reduced by immersing the work piece (12) in the heated work oil (4). However, in Example 4, as shown in FIG. 3, the heated processing oil (4) is pressurized by the pump (13) and applied to the workpiece (12) not immersed in the processing oil (4). In contrast, the amount of processing oil adhering to the workpiece (12) can be reduced by injecting it. In this way, by injecting the processing oil (4) onto the workpiece (12), the weight loss efficiency of the processing oil adhering to the workpiece (12) can be further increased with the pressure of the injection. It becomes possible.

  Further, the weight loss treatment of the present invention may be performed under normal pressure or under reduced pressure. If the reduction treatment is performed under a reduced pressure with less oxygen than the normal pressure, oxidation deterioration of the processing oil (4) may occur. It becomes possible to prevent.

  In the fourth embodiment, as shown in FIG. 3, the storage tank (1) is provided with a heating mechanism (5) and a temperature sensor (9) for heating the processing oil (4). In Example 5, as shown in FIG. 4, a heating mechanism (5) and a temperature sensor (9) are provided in a heating tank (14) provided outside the storage tank (1). Then, the third on-off valve (15) is opened by a signal from the second liquid level sensor (17) disposed in the heating tank (14), and a part of the processing oil (4) in the storage tank (1) is removed. After introducing into the heating tank (14), the third on-off valve (15) is closed by a signal from the second liquid level sensor (17). And after heating the processing oil (4) introduce | transduced in the heating tank (14), this heated processing oil (4) shall be pressurized with a pump (13), and shall be injected to a workpiece (12). . By adopting such a configuration, out of the processing oil (4) stored in the storage tank (1), only the amount necessary for contact with the workpiece (12) is stored in the heating tank (14). Therefore, it is possible to save heating energy as compared with the case where all of the processing oil (4) in the storage tank (1) is heated. In this embodiment, as described above, the processing oil (4) is introduced from the storage tank (1) to the heating tank (14). However, in other different embodiments, it is provided separately. It is also possible to introduce the processing oil (1) from the tank into the heating tank (14).

DESCRIPTION OF SYMBOLS 1 Storage tank 4 Processing oil 5 Heating mechanism 12 Workpiece

  The present invention relates to a processing method and apparatus for reducing the amount of residual working oil adhering to a workpiece during the processing of the workpiece such as cutting, grinding, pressing, drawing, punching, drawing, and forging. It is about.

  Conventionally, when processing a workpiece such as cutting, grinding, pressing, drawing, punching, drawing, forging, etc., the processing oil is attached to the workpiece for the purpose of suppressing friction or cooling. Therefore, a large amount of processing oil remains on the workpiece after the processing operation. The processing oil adhering and remaining on the workpiece needs to be removed or reduced from the surface of the workpiece in preparation for use in the next step. Therefore, as shown in Patent Document 1, cleaning oil is removed from the surface of the workpiece by spraying a cleaning solvent on the workpiece after the above-described processing work or immersing the workpiece in the cleaning solvent. The work to do is generally done.

JP 2001-246335 A

  Conventionally, when cleaning the workpiece as described above, the workpiece to which the processing oil is adhered by the processing operation is put into the cleaning machine as it is, and spray cleaning or immersion using the cleaning solvent as described above is performed. We were cleaning. For this reason, all the processing oil adhering to the workpiece by the machining operation is removed from the workpiece together with the cleaning solvent by the above-mentioned washing operation and taken out, and the consumption of the processing oil becomes intense and the running cost increases. The load on the environment was also high.

  In addition, a large amount of cleaning solvent is required to remove the above large amount of processing oil in order to clean the workpiece in which a large amount of processing oil adheres and remains as it is due to processing operations. Running cost was high. In addition, as described above, by washing a workpiece on which a large amount of processing oil is adhered and remaining with a cleaning solvent, a large amount of processing oil is mixed into the cleaning solvent, which increases the contamination rate of the cleaning solvent. Accordingly, the frequency of replacement of the cleaning solvent is increased, and the running cost is also increased in this respect.

  Accordingly, the present invention is intended to solve the above-described problems. The processing oil adhering to the workpiece by the machining operation is reduced and removed by a simple method so that it can be reused. It is intended to reduce the running cost and reduce the burden on the global environment by reducing the cleaning solvent required for cleaning the workpiece or reducing it to zero in some cases.

In order to solve the problems as described above, the present invention reduces the viscosity by heating the same processing oil as the processing oil used in the processing operation of the workpiece to a temperature higher than the oil temperature during the processing operation. Reducing the viscosity of the processing oil adhering to the workpiece by bringing the processed oil into contact with the workpiece to which the processing oil has adhered by the above-mentioned processing operation as a pre-process of the cleaning process using a degreasing cleaner. This reduces the amount of adhesion.

In addition, the apparatus for carrying out the above-described method is a storage tank that stores a workpiece to which the processing oil is attached by a processing operation and that can be contacted with the same processing oil as the processing oil used for the processing operation of the workpiece. And a heating mechanism that is disposed inside or outside the storage tank and reduces the viscosity by heating the same processing oil to a temperature higher than the oil temperature of the processing oil at the time of processing the workpiece. Then, by bringing the workpiece to which the processing oil is adhered into contact with the heated processing oil as a pre-process of the cleaning process using a degreasing cleaner, the viscosity of the processing oil adhered to the workpiece is reduced, and the adhesion The amount can be reduced.

Further, the heated working fluid in contact with the workpiece, Ri by the be performed as a pre-process of the cleaning process using the degreasing cleaner, attached to the workpiece by contact with the working oil is heated above Symbol Since the viscosity of the processing oil is decreased and the residual amount of adhesion is reduced, the degreasing machine is used for cleaning. Compared with the case where the workpiece after processing is put into the degreasing machine as it is. In addition, it is possible to facilitate cleaning with a degreasing machine, and it is also possible to increase the cleanliness of the workpiece after degreasing. Further, as described above, by reducing the amount of residual processing oil adhered to the workpiece before degreasing, it is possible to reduce the amount of cleaning solvent used for degreasing the workpiece. Therefore, it is possible to reduce the cost of degreasing and cleaning.

Further, the heated processing oil may be cooled and reused for processing the workpiece. In the present invention, since the processing oil used for processing the workpiece and the heated processing oil are the same, even if the processing oil remaining on the workpiece is mixed into the heated processing oil, it is the same. It can be easily reused as a processing oil.

  The heating of the processing oil and the contact between the heated processing oil and the workpiece may be performed in an inert gas atmosphere such as nitrogen gas or argon gas. In the present invention, as described above, the processing oil is heated and used, and some processing oils are likely to be oxidized and deteriorated by heating in this way. Therefore, in the case of using processing oil that easily undergoes oxidative degradation due to heating as described above, by heating the processing oil and contacting the heated processing oil and the workpiece in an inert gas atmosphere, Since it is possible to block the contact between the processing oil and the atmosphere with an inert gas such as nitrogen gas or argon gas, it becomes possible to suppress the oxidative deterioration of the processing oil and to recycle the processing oil repeatedly. Is possible.

Further, the heating temperature of the processing oil may be 50 ° C to 200 ° C. The processing oil is usually used for cooling the processed portion, and the temperature may rise to nearly 50 ° C. during processing due to heat exchange with the processed portion. Therefore, if the heating temperature of the processing oil is less than 50 ° C., the heating temperature may be lower than the oil temperature of the processing oil at the time of the processing operation, and in this case, the processing oil is attached to the surface of the workpiece. There is a possibility that the viscosity of the processing oil cannot be lowered sufficiently and the amount of the processing oil deposited cannot be reduced sufficiently. Further, when the heating temperature of the processing oil exceeds 200 ° C., the processing oil is thermally deteriorated due to overheating, and it becomes difficult to reuse the processing oil, and there is a possibility of ignition.

Further, when the heated processing oil and the workpiece are in contact, the workpiece is rotated, oscillated, ultrasonic vibration, applied to the workpiece while the workpiece is immersed in the heated processing oil. One or a plurality of means for injecting the processing oil or injecting the processing oil heated to the workpiece not immersed in the processing oil may be selectively used. In this case, when the heated processing oil and the workpiece are in contact with each other, the above-described physical force is applied to the workpiece, thereby further reducing the weight loss efficiency of the adhered processing oil and the processing waste from the workpiece. It becomes possible to raise.

The present invention is configured as described above, and the oil of the processing oil attached to the workpiece is lowered by bringing the heated processing oil into contact with the workpiece and reducing the viscosity of the processing oil attached to the workpiece. This makes it possible to cut well and reduce the amount of residual processing oil adhering to the workpiece without using a cleaning solvent. In addition, by reducing the viscosity of the adhering processing oil as described above and improving its oil drainage, it is possible to reduce the adhesion amount of chips and other processing debris adhering to the workpiece by processing operations. It is what.

Therefore, by performing the treatment process of the present invention before the cleaning operation using the cleaning solvent, the amount of the cleaning solvent used can be reduced compared to the case where the workpiece after the processing operation is cleaned as it is using the cleaning solvent. The workpiece can be easily cleaned to a high cleanliness while reducing the running cost of cleaning. In addition, if precision cleaning is not required, it is possible to dry the work piece as it is without performing cleaning work using a cleaning solvent after the treatment process of the present invention, and to move to the next process. In this case, no cleaning solvent is required, and the cleaning process can be simplified and the running cost can be reduced.

In addition, the processing oil adhered to the workpiece is mixed with the heated processing oil by contacting the workpiece to which the processing oil is adhered by the processing operation with the heated processing oil, but both are the same processing oil. Therefore, it can be easily reused as it is. Therefore, compared with the case where all the processing oil adhering to the workpiece is removed by the cleaning solvent, the consumption of the processing oil can be reduced and the running cost can be reduced. Further, by making it possible to reuse the processing oil adhering to the workpiece, it is possible to reduce the amount of CO ₂ emission and to reduce the burden on the global environment.

1 is a conceptual diagram illustrating Example 1. FIG. The graph which shows transition of the oil temperature of process oil and the residual rate of adhesion process oil in Examples 1-3. FIG. 9 is a conceptual diagram illustrating Example 4; FIG. 9 is a conceptual diagram illustrating Example 5.

Embodiment 1 of the present invention will be described in detail with reference to the drawings. (1) is a storage tank, and an upper entrance / exit (2) is covered with a lid (3) so as to be opened and closed. In this storage tank (1), the processing oil (4) is stored as shown in FIG. 1, and the processing oil (4) can be heated by the heating mechanism (5) disposed in the storage tank (1). It is said. In addition, a temperature sensor (9) is disposed in the storage tank (1), and a processing oil tank (8) is connected via an overflow pipe (7) provided with a first on-off valve (6). The storage tank (1) is provided with a first liquid level sensor (16). When the liquid level of the processing oil (4) in the storage tank (1) becomes equal to or higher than a certain level, the first liquid level sensor (16) is provided. The first on-off valve (6) is opened by a signal from the liquid level sensor (16), and the processing oil (4) can be introduced into the processing oil tank (8) via the overflow pipe (7). Moreover, the inlet (10) for inject | pouring inert gas, such as nitrogen gas and argon gas, is connected to the storage tank (1) through the 2nd on-off valve (11).

In the configuration as described above, in order to reduce the amount of processing oil adhering to the workpiece (12) by the processing operation, the processing oil (4) of the same type as the processing oil used for the processing operation is stored. The same kind of processing oil (4) is stored in the tank (1) and heated to a temperature higher than the oil temperature of the processing oil during the processing operation by the heating mechanism (5). Then, the workpiece (12) to which the processing oil is adhered by the machining operation is introduced into the storage tank (1) from the entrance (2) where the lid (3) is opened, and the lid (3) is closed. Then, the workpiece (12) is immersed in the heated processing oil (4) in the storage tank (1) as shown in FIG. By soaking the workpiece (12) in the heated processing oil (4) in this way, the processing oil attached to the workpiece (12) is heated and its viscosity is lowered. Then, with the viscosity of the processing oil adhering to the workpiece (12) lowered, the workpiece (12) is pulled up from the processing oil (4) as shown by a two-dot chain line in FIG.

In this way, the workpiece (12) is pulled up from the heated processing oil (4) in a state where the viscosity of the processing oil adhered to the workpiece (12) is lowered, thereby giving the workpiece (12) It is possible to improve the drainage of the attached processing oil, and to reduce the residual amount of the processing oil attached to the workpiece (12) without using a cleaning solvent. Further, by reducing the viscosity of the processing oil adhering to the workpiece (12) as described above to improve the oil drainage, it is possible to remove chips and other adhering to the workpiece (12) by the processing operation. It becomes possible to reduce the adhesion amount of processing waste.

Therefore, by performing the treatment process of the present invention before the cleaning operation using the cleaning solvent, compared with the case of cleaning the workpiece (12) after the processing operation as it is using the cleaning solvent, The work piece (12) can be easily cleaned to a high cleanliness while reducing the amount used, and the running cost of cleaning can be reduced. For example, if the treatment process of the present invention is performed as a pre-process of a cleaning process using a degreasing cleaner (not shown), the cleaning operation by the above-described degreasing cleaner can be facilitated. The cleanliness of the workpiece (12) after washing can also be increased.

If precision cleaning is not required, the workpiece (12) can be directly dried with hot air and transferred to the next step without performing a cleaning operation using a cleaning solvent after the processing step of the present invention. In this case, no cleaning solvent is required, so that the cleaning process can be simplified and the running cost can be reduced.

Further, as described above, when the workpiece (12) to which the processing oil is adhered by the processing operation is brought into contact with the heated processing oil (4), the processing oil adhered to the workpiece (12) by the processing operation is stored in the storage tank. It mixes with the processing oil (4) in (1), and the amount of processing oil (4) in the storage tank (1) increases. This increased amount of processing oil (4) flows into the processing oil tank (8) through the overflow pipe (7) with the first on-off valve (6) opened. In the present invention, as described above, since the heated processing oil (4) in the storage tank (1) and the processing oil used for the processing operation are of the same type, the inside of the processing oil tank (8) By cooling the processing oil (4) that has flowed into the workpiece using a cooling heat exchanger (not shown), the processing oil (4) can be easily reused for processing the workpiece (12) as it is. Therefore, compared with the case where all the processing oil adhering to the workpiece (12) is removed by the cleaning solvent, the consumption of the processing oil can be reduced and the running cost can be reduced. In addition, by making it possible to reuse the processing oil that has adhered to the workpiece (12), it is possible to reduce the amount of CO ₂ emission and to reduce the burden on the global environment.

  Further, in the present invention, as described above, the processing oil (4) is heated and used, and depending on the processing oil (4), some of the processing oil (4) is likely to be oxidized and deteriorated by heating. . Therefore, in the present embodiment, when the processing oil (4) is heated and when the heated processing oil (4) is in contact with the workpiece (12), the second on-off valve ( 11) is opened, and inert gas such as nitrogen gas or argon gas is introduced into the storage tank (1) from the inert gas inlet (10). By introducing the inert gas into the storage tank (1) in this way, the heating of the processing oil (4) and the contact between the heated processing oil (4) and the workpiece (12) are prevented. It becomes possible to perform in the atmosphere of active gas. For this reason, the contact between the processing oil (4) and the atmosphere can be blocked by the inert gas, and the oxidation deterioration of the processing oil (4) can be suppressed. ) Can be reused repeatedly.

Moreover, the heating of the above-mentioned processing oil (4) is performed at a temperature higher than the oil temperature of the processing oil during the processing operation, and is preferably set to 50 ° C to 200 ° C. The processing oil is usually used for cooling the processed portion, and the temperature may rise to nearly 50 ° C. during processing due to heat exchange with the processed portion. Therefore, if the heating temperature of the processing oil (4) is less than 50 ° C., the heating temperature may be lower than the oil temperature of the processing oil during the processing operation. In this case, the heated processing oil ( Due to 4), the viscosity of the processing oil adhering to the surface of the workpiece (12) cannot be sufficiently reduced, and the amount of the processing oil attached may not be sufficiently reduced. When the heating temperature of the processing oil (4) exceeds 200 ° C., the processing oil (4) is thermally deteriorated due to overheating, making it difficult to reuse the processing oil (4) and the possibility of ignition. Also occurs.

  Further, when the workpiece (12) is immersed in the heated processing oil (4) as described above, the workpiece (12) is rotated or rocked, or ultrasonic vibration is applied to the processing oil (4). If the processing oil (4) is sprayed onto the workpiece (12), the attached processing oil and processing from the workpiece (12) with the physical force by the rotation, swing, ultrasonic vibration or jetting. It is possible to further increase the efficiency of waste reduction.

Further, if the workpiece (12) whose adhesion amount of the processing oil is reduced by contact with the processing oil (4) as described above is further immersed in hot water, the processing oil adhered to the workpiece (12) and It is possible to further reduce the amount of processing dust attached, to facilitate the drying operation of the workpiece (12), and to increase the amount of processing oil recovered. Moreover, when ethyl alcohol or IPA is mixed with the hot water, it becomes possible to further increase the weight loss efficiency of the processing oil and processing waste adhering to the workpiece (12), and the workpiece (12) The drying operation becomes easier.

In addition, an experiment was conducted to prove that the amount of residual processing oil adhered to the workpiece (12) can be reduced by heating the processing oil. In this experiment, an iron plate having a square shape with a surface of 100 mm × 100 mm and a thickness of 1 mm was used as the workpiece (12). Details of the processing oil (4) used in this experiment are shown in Table 1. The processing oil 1 is used in Example 1, the processing oil 2 is used in Example 2 described later, and the processing oil 3 is used in Example 3 described later.

The experimental method of Example 1 of this experiment is as follows. First, the workpiece (12) to which the processing oil is not adhered is immersed in the processing oil (4) at normal temperature (21 ° C.) for 1 minute, and then pulled up from the processing oil (4) to perform oil removal for 3 minutes. The weight of the workpiece (12) was measured. And the weight difference of this weight and the weight before processing oil adheres was made into the amount of adhesion of processing oil in normal temperature. Next, after heating the processing oil (4) to 85 ° C., the workpiece (12) after the above oil draining is immersed in the processing oil (4) for 1 minute, and then pulled up to perform oil draining for 3 minutes. The weight of the workpiece (12) was measured. Then, the weight difference between this weight and the weight before the processing oil is attached is defined as the amount of the processing oil adhering to the heating temperature. Further, the processing oil (4) was further heated to 140 ° C. and 190 ° C., and the same measurement was performed.

The experimental results of Example 1 of this experiment are shown in Table 2. In Example 1 and Examples 2 and 3 to be described later, the residual rate and weight loss rate of the processing oil at each oil temperature were calculated based on the amount of oil adhering at normal temperature.

As shown in Table 2, in Example 1, when the oil temperature of the processing oil (4) was increased from 21 ° C. to 190 ° C., the residual rate of the processing oil at 21 ° C. was 100%. In addition, the residual ratio of processing oil could be reduced to 13.9%.

  The experimental method of Example 2 of this experiment is that the oil temperature of the processing oil (4) at normal temperature is 32 ° C, and the oil temperature of the heated processing oil (4) is 72 ° C, 115 ° C, and 153 ° C. Except for this, it is the same as Example 1. The experimental results of Example 2 are shown in Table 3.

As shown in Table 3, in Example 2, when the oil temperature of the processing oil (4) was raised from 32 ° C. to 153 ° C., the residual rate of the processing oil at 32 ° C. was 100%. Furthermore, the residual ratio of the processing oil could be reduced to 61.5%.

The experimental method of Example 3 of this experiment is that the temperature of the processing oil (4) at normal temperature is 32 ° C., and the temperature of the heated processing oil (4) is 71 ° C., 113 ° C., and 153 ° C. Except for this, it is the same as Example 1. The experimental results of Example 3 are shown in Table 4.

As shown in Table 4, in Example 3, when the oil temperature of the processing oil (4) was increased from 32 ° C. to 153 ° C., the residual rate of the processing oil at 32 ° C. was 100%. Furthermore, the residual ratio of the processing oil could be reduced to 25.0%.

FIG. 2 shows a graph of changes in the oil temperature of the processing oil and the residual ratio of the processing oil in Examples 1 to 3.

As shown in FIG. 2, in all of Examples 1 to 3, by heating the processing oil (4), the residual ratio of the processing oil to the workpiece (12) was lowered. This is because the processing oil attached to the surface of the workpiece (12) comes into contact with the heated processing oil (4) in the storage tank (1), thereby causing the viscosity of the processing oil attached to the workpiece (12). This is because the removal of the processing oil adhering to the workpiece (12) is promoted. From this, it was proved that the amount of adhesion of the processing oil to the workpiece (12) can be reduced by heating the processing oil (4). Therefore, as in the present invention, by bringing the workpiece (12) to which the processing oil is adhered by the processing operation into contact with the heated processing oil (4) and heating the processing oil adhered to the workpiece (12), It was confirmed that the amount of processing oil attached to the workpiece (12) can be reduced.

In the above-described Examples 1 to 3, the work oil (4) attached to the work piece (12) can be reduced by immersing the work piece (12) in the heated work oil (4). However, in Example 4, as shown in FIG. 3, the heated processing oil (4) is pressurized by the pump (13) and applied to the workpiece (12) not immersed in the processing oil (4). In contrast, the amount of processing oil adhering to the workpiece (12) can be reduced by injecting it. In this way, by injecting the processing oil (4) onto the workpiece (12), the weight loss efficiency of the processing oil adhering to the workpiece (12) can be further increased with the pressure of the injection. It becomes possible.

Further, the weight loss treatment of the present invention may be performed under normal pressure or under reduced pressure. If the reduction treatment is performed under a reduced pressure with less oxygen than the normal pressure, oxidation deterioration of the processing oil (4) may occur. It becomes possible to prevent.

In the fourth embodiment, as shown in FIG. 3, the storage tank (1) is provided with a heating mechanism (5) and a temperature sensor (9) for heating the processing oil (4). In Example 5, as shown in FIG. 4, a heating mechanism (5) and a temperature sensor (9) are provided in a heating tank (14) provided outside the storage tank (1). Then, the third on-off valve (15) is opened by a signal from the second liquid level sensor (17) disposed in the heating tank (14), and a part of the processing oil (4) in the storage tank (1) is removed. After introducing into the heating tank (14), the third on-off valve (15) is closed by a signal from the second liquid level sensor (17). And after heating the processing oil (4) introduce | transduced in the heating tank (14), this heated processing oil (4) shall be pressurized with a pump (13), and shall be injected to a workpiece (12). . By adopting such a configuration, out of the processing oil (4) stored in the storage tank (1), only the amount necessary for contact with the workpiece (12) is stored in the heating tank (14). Therefore, it is possible to save heating energy as compared with the case where all of the processing oil (4) in the storage tank (1) is heated. In this embodiment, as described above, the processing oil (4) is introduced from the storage tank (1) to the heating tank (14). However, in other different embodiments, it is provided separately. It is also possible to introduce the processing oil (1) from the tank into the heating tank (14).

DESCRIPTION OF SYMBOLS 1 Storage tank 4 Processing oil 5 Heating mechanism 12 Workpiece

  The present invention relates to a processing method and apparatus for reducing the amount of residual working oil adhering to a workpiece during the processing of the workpiece such as cutting, grinding, pressing, drawing, punching, drawing, and forging. It is about.

  Conventionally, when processing a workpiece such as cutting, grinding, pressing, drawing, punching, drawing, forging, etc., the processing oil is attached to the workpiece for the purpose of suppressing friction or cooling. Therefore, a large amount of processing oil remains on the workpiece after the processing operation. The processing oil adhering and remaining on the workpiece needs to be removed or reduced from the surface of the workpiece in preparation for use in the next step. Therefore, as shown in Patent Document 1, cleaning oil is removed from the surface of the workpiece by spraying a cleaning solvent on the workpiece after the above-described processing work or immersing the workpiece in the cleaning solvent. The work to do is generally done.

JP 2001-246335 A

  Conventionally, when cleaning the workpiece as described above, the workpiece to which the processing oil is adhered by the processing operation is put into the cleaning machine as it is, and spray cleaning or immersion using the cleaning solvent as described above is performed. We were cleaning. For this reason, all the processing oil adhering to the workpiece by the machining operation is removed from the workpiece together with the cleaning solvent by the above-mentioned washing operation and taken out, and the consumption of the processing oil becomes intense and the running cost increases. The load on the environment was also high.

  In addition, a large amount of cleaning solvent is required to remove the above large amount of processing oil in order to clean the workpiece in which a large amount of processing oil adheres and remains as it is due to processing operations. Running cost was high. In addition, as described above, by washing a workpiece on which a large amount of processing oil is adhered and remaining with a cleaning solvent, a large amount of processing oil is mixed into the cleaning solvent, which increases the contamination rate of the cleaning solvent. Accordingly, the frequency of replacement of the cleaning solvent is increased, and the running cost is also increased in this respect.

  Accordingly, the present invention is intended to solve the above-described problems. The processing oil adhering to the workpiece by the machining operation is reduced and removed by a simple method so that it can be reused. It is intended to reduce the running cost and reduce the burden on the global environment by reducing the cleaning solvent required for cleaning the workpiece or reducing it to zero in some cases.

In order to solve the problems as described above, the present invention reduces the viscosity by heating the same processing oil as the processing oil used in the processing operation of the workpiece to a temperature higher than the oil temperature during the processing operation. Reducing the viscosity of the processing oil adhering to the workpiece by bringing the processed oil into contact with the workpiece to which the processing oil has adhered by the above-mentioned processing operation as a pre-process of the cleaning process using a degreasing cleaner. The process of reducing the adhesion amount is performed while preventing oxidative deterioration of the processing oil in a reduced pressure state .

In addition, the apparatus for carrying out the above-described method is a storage tank that stores a workpiece to which the processing oil is attached by a processing operation and that can be contacted with the same processing oil as the processing oil used for the processing operation of the workpiece. And a heating mechanism that is disposed inside or outside the storage tank and reduces the viscosity by heating the same processing oil to a temperature higher than the oil temperature of the processing oil at the time of processing the workpiece. It is possible to reduce the amount of adhesion by reducing the viscosity of the processing oil adhering to the workpiece by bringing the workpiece to which the workpiece adheres into contact with the heated processing oil as a pre-process of the cleaning process using a degreasing cleaner. The treatment to be performed is performed while preventing the oxidative deterioration of the processing oil in a reduced pressure state .

  In addition, the contact between the heated processing oil and the workpiece is performed as a pre-process of the cleaning process using the degreasing machine, so that the processing oil adhered to the workpiece due to the contact with the heated processing oil can be reduced. Since the viscosity is reduced and the residual amount of adhesion is reduced, cleaning is performed using a degreasing cleaner. Therefore, compared with the case where the workpiece after processing is put into the degreasing cleaner as it is, the degreasing cleaning is performed. It is possible to facilitate cleaning by a machine and to increase the cleanliness of the workpiece after degreasing cleaning. Further, as described above, by reducing the amount of residual processing oil adhered to the workpiece before degreasing, it is possible to reduce the amount of cleaning solvent used for degreasing the workpiece. Therefore, it is possible to reduce the cost of degreasing and cleaning.

  Further, the heated processing oil may be cooled and reused for processing the workpiece. In the present invention, since the processing oil used for processing the workpiece and the heated processing oil are the same, even if the processing oil remaining on the workpiece is mixed into the heated processing oil, it is the same. It can be easily reused as a processing oil.

  Further, the heating temperature of the processing oil may be 50 ° C to 200 ° C. The processing oil is usually used for cooling the processed portion, and the temperature may rise to nearly 50 ° C. during processing due to heat exchange with the processed portion. Therefore, if the heating temperature of the processing oil is less than 50 ° C., the heating temperature may be lower than the oil temperature of the processing oil at the time of the processing operation, and in this case, the processing oil is attached to the surface of the workpiece. There is a possibility that the viscosity of the processing oil cannot be lowered sufficiently and the amount of the processing oil deposited cannot be reduced sufficiently. Further, when the heating temperature of the processing oil exceeds 200 ° C., the processing oil is thermally deteriorated due to overheating, and it becomes difficult to reuse the processing oil, and there is a possibility of ignition.

  Further, when the heated processing oil and the workpiece are in contact, the workpiece is rotated, oscillated, ultrasonic vibration, applied to the workpiece while the workpiece is immersed in the heated processing oil. One or a plurality of means for injecting the processing oil or injecting the processing oil heated to the workpiece not immersed in the processing oil may be selectively used. In this case, when the heated processing oil and the workpiece are in contact with each other, the above-described physical force is applied to the workpiece, thereby further reducing the weight loss efficiency of the adhered processing oil and the processing waste from the workpiece. It becomes possible to raise.

  The present invention is configured as described above, and the oil of the processing oil attached to the workpiece is lowered by bringing the heated processing oil into contact with the workpiece and reducing the viscosity of the processing oil attached to the workpiece. This makes it possible to cut well and reduce the amount of residual processing oil adhering to the workpiece without using a cleaning solvent. In addition, by reducing the viscosity of the adhering processing oil as described above and improving its oil drainage, it is possible to reduce the adhesion amount of chips and other processing debris adhering to the workpiece by processing operations. It is what.

  Therefore, by performing the treatment process of the present invention before the cleaning operation using the cleaning solvent, the amount of the cleaning solvent used can be reduced compared to the case where the workpiece after the processing operation is cleaned as it is using the cleaning solvent. The workpiece can be easily cleaned to a high cleanliness while reducing the running cost of cleaning. In addition, if precision cleaning is not required, it is possible to dry the work piece as it is without performing cleaning work using a cleaning solvent after the treatment process of the present invention, and to move to the next process. In this case, no cleaning solvent is required, and the cleaning process can be simplified and the running cost can be reduced.

In addition, the processing oil adhered to the workpiece is mixed with the heated processing oil by contacting the workpiece to which the processing oil is adhered by the processing operation with the heated processing oil, but both are the same processing oil. Therefore, it can be easily reused as it is. Therefore, compared with the case where all the processing oil adhering to the workpiece is removed by the cleaning solvent, the consumption of the processing oil can be reduced and the running cost can be reduced. Further, by making it possible to reuse the processing oil adhering to the workpiece, it is possible to reduce the amount of CO ₂ emission and to reduce the burden on the global environment. Moreover, since the weight reduction process is performed in a reduced pressure state in which oxygen is less than that in the normal pressure state, it is possible to prevent oxidative degradation of the processing oil.

1 is a conceptual diagram illustrating Example 1. FIG. Guff which shows transition of oil temperature of processing oil and residual rate of adhesion processing oil in Examples 1-3. FIG. 9 is a conceptual diagram illustrating Example 4; FIG. 9 is a conceptual diagram illustrating Example 5.

  Embodiment 1 of the present invention will be described in detail with reference to the drawings. (1) is a storage tank, and an upper entrance / exit (2) is covered with a lid (3) so as to be opened and closed. In this storage tank (1), the processing oil (4) is stored as shown in FIG. 1, and the processing oil (4) can be heated by the heating mechanism (5) disposed in the storage tank (1). It is said. In addition, a temperature sensor (9) is disposed in the storage tank (1), and a processing oil tank (8) is connected via an overflow pipe (7) provided with a first on-off valve (6). The storage tank (1) is provided with a first liquid level sensor (16). When the liquid level of the processing oil (4) in the storage tank (1) becomes equal to or higher than a certain level, the first liquid level sensor (16) is provided. The first on-off valve (6) is opened by a signal from the liquid level sensor (16), and the processing oil (4) can be introduced into the processing oil tank (8) via the overflow pipe (7). Moreover, the inlet (10) for inject | pouring inert gas, such as nitrogen gas and argon gas, is connected to the storage tank (1) through the 2nd on-off valve (11).

  In the configuration as described above, in order to reduce the amount of processing oil adhering to the workpiece (12) by the processing operation, the processing oil (4) of the same type as the processing oil used for the processing operation is stored. The same kind of processing oil (4) is stored in the tank (1) and heated to a temperature higher than the oil temperature of the processing oil during the processing operation by the heating mechanism (5). Then, the workpiece (12) to which the processing oil is adhered by the machining operation is introduced into the storage tank (1) from the entrance (2) where the lid (3) is opened, and the lid (3) is closed. Then, the workpiece (12) is immersed in the heated processing oil (4) in the storage tank (1) as shown in FIG. By soaking the workpiece (12) in the heated processing oil (4) in this way, the processing oil attached to the workpiece (12) is heated and its viscosity is lowered. Then, with the viscosity of the processing oil adhering to the workpiece (12) lowered, the workpiece (12) is pulled up from the processing oil (4) as shown by a two-dot chain line in FIG.

  In this way, the workpiece (12) is pulled up from the heated processing oil (4) in a state where the viscosity of the processing oil adhered to the workpiece (12) is lowered, thereby giving the workpiece (12) It is possible to improve the drainage of the attached processing oil, and to reduce the residual amount of the processing oil attached to the workpiece (12) without using a cleaning solvent. Further, by reducing the viscosity of the processing oil adhering to the workpiece (12) as described above to improve the oil drainage, it is possible to remove chips and other adhering to the workpiece (12) by the processing operation. It becomes possible to reduce the adhesion amount of processing waste.

  Therefore, by performing the treatment process of the present invention before the cleaning operation using the cleaning solvent, compared with the case of cleaning the workpiece (12) after the processing operation as it is using the cleaning solvent, The work piece (12) can be easily cleaned to a high cleanliness while reducing the amount used, and the running cost of cleaning can be reduced. For example, if the treatment process of the present invention is performed as a pre-process of a cleaning process using a degreasing cleaner (not shown), the cleaning operation by the above-described degreasing cleaner can be facilitated. The cleanliness of the workpiece (12) after washing can also be increased.

  If precision cleaning is not required, the workpiece (12) can be directly dried with hot air and transferred to the next step without performing a cleaning operation using a cleaning solvent after the processing step of the present invention. In this case, no cleaning solvent is required, so that the cleaning process can be simplified and the running cost can be reduced.

Further, as described above, when the workpiece (12) to which the processing oil is adhered by the processing operation is brought into contact with the heated processing oil (4), the processing oil adhered to the workpiece (12) by the processing operation is stored in the storage tank. It mixes with the processing oil (4) in (1), and the amount of processing oil (4) in the storage tank (1) increases. This increased amount of processing oil (4) flows into the processing oil tank (8) through the overflow pipe (7) with the first on-off valve (6) opened. In the present invention, as described above, since the heated processing oil (4) in the storage tank (1) and the processing oil used for the processing operation are of the same type, the inside of the processing oil tank (8) By cooling the processing oil (4) that has flowed into the workpiece using a cooling heat exchanger (not shown), the processing oil (4) can be easily reused for processing the workpiece (12) as it is. Therefore, compared with the case where all the processing oil adhering to the workpiece (12) is removed by the cleaning solvent, the consumption of the processing oil can be reduced and the running cost can be reduced. In addition, by making it possible to reuse the processing oil that has adhered to the workpiece (12), it is possible to reduce the amount of CO ₂ emission and to reduce the burden on the global environment.

  Further, in the present invention, as described above, the processing oil (4) is heated and used, and depending on the processing oil (4), some of the processing oil (4) is likely to be oxidized and deteriorated by heating. . Therefore, in the present embodiment, when the processing oil (4) is heated and when the heated processing oil (4) is in contact with the workpiece (12), the second on-off valve ( 11) is opened, and inert gas such as nitrogen gas or argon gas is introduced into the storage tank (1) from the inert gas inlet (10). By introducing the inert gas into the storage tank (1) in this way, the heating of the processing oil (4) and the contact between the heated processing oil (4) and the workpiece (12) are prevented. It becomes possible to perform in the atmosphere of active gas. For this reason, the contact between the processing oil (4) and the atmosphere can be blocked by the inert gas, and the oxidation deterioration of the processing oil (4) can be suppressed. ) Can be reused repeatedly.

  Moreover, the heating of the above-mentioned processing oil (4) is performed at a temperature higher than the oil temperature of the processing oil during the processing operation, and is preferably set to 50 ° C to 200 ° C. The processing oil is usually used for cooling the processed portion, and the temperature may rise to nearly 50 ° C. during processing due to heat exchange with the processed portion. Therefore, if the heating temperature of the processing oil (4) is less than 50 ° C., the heating temperature may be lower than the oil temperature of the processing oil during the processing operation. In this case, the heated processing oil ( Due to 4), the viscosity of the processing oil adhering to the surface of the workpiece (12) cannot be sufficiently reduced, and the amount of the processing oil attached may not be sufficiently reduced. When the heating temperature of the processing oil (4) exceeds 200 ° C., the processing oil (4) is thermally deteriorated due to overheating, making it difficult to reuse the processing oil (4) and the possibility of ignition. Also occurs.

  Further, when the workpiece (12) is immersed in the heated processing oil (4) as described above, the workpiece (12) is rotated or rocked, or ultrasonic vibration is applied to the processing oil (4). If the processing oil (4) is sprayed onto the workpiece (12), the attached processing oil and processing from the workpiece (12) with the physical force by the rotation, swing, ultrasonic vibration or jetting. It is possible to further increase the efficiency of waste reduction.

  Further, if the workpiece (12) whose adhesion amount of the processing oil is reduced by contact with the processing oil (4) as described above is further immersed in hot water, the processing oil adhered to the workpiece (12) and It is possible to further reduce the amount of processing dust attached, to facilitate the drying operation of the workpiece (12), and to increase the amount of processing oil recovered. Moreover, when ethyl alcohol or IPA is mixed with the hot water, it becomes possible to further increase the weight loss efficiency of the processing oil and processing waste adhering to the workpiece (12), and the workpiece (12) The drying operation becomes easier.

  In addition, an experiment was conducted to prove that the amount of residual processing oil adhered to the workpiece (12) can be reduced by heating the processing oil. In this experiment, an iron plate having a square shape with a surface of 100 mm × 100 mm and a thickness of 1 mm was used as the workpiece (12). Details of the processing oil (4) used in this experiment are shown in Table 1. The processing oil 1 is used in Example 1, the processing oil 2 is used in Example 2 described later, and the processing oil 3 is used in Example 3 described later.

  The experimental method of Example 1 of this experiment is as follows. First, the workpiece (12) to which the processing oil is not adhered is immersed in the processing oil (4) at normal temperature (21 ° C.) for 1 minute, and then pulled up from the processing oil (4) to perform oil removal for 3 minutes. The weight of the workpiece (12) was measured. And the weight difference of this weight and the weight before processing oil adheres was made into the amount of adhesion of processing oil in normal temperature. Next, after heating the processing oil (4) to 85 ° C., the workpiece (12) after the above oil draining is immersed in the processing oil (4) for 1 minute, and then pulled up to perform oil draining for 3 minutes. The weight of the workpiece (12) was measured. Then, the weight difference between this weight and the weight before the processing oil is attached is defined as the amount of the processing oil adhering to the heating temperature. Further, the processing oil (4) was further heated to 140 ° C. and 190 ° C., and the same measurement was performed.

  The experimental results of Example 1 of this experiment are shown in Table 2. In Example 1 and Examples 2 and 3 to be described later, the residual rate and weight loss rate of the processing oil at each oil temperature were calculated based on the amount of oil adhering at normal temperature.

  As shown in Table 2, in Example 1, when the oil temperature of the processing oil (4) was increased from 21 ° C. to 190 ° C., the residual rate of the processing oil at 21 ° C. was 100%. In addition, the residual ratio of processing oil could be reduced to 13.9%.

  The experimental method of Example 2 of this experiment is that the oil temperature of the processing oil (4) at normal temperature is 32 ° C, and the oil temperature of the heated processing oil (4) is 72 ° C, 115 ° C, and 153 ° C. Except for this, it is the same as Example 1. The experimental results of Example 2 are shown in Table 3.

  As shown in Table 3, in Example 2, when the oil temperature of the processing oil (4) was raised from 32 ° C. to 153 ° C., the residual rate of the processing oil at 32 ° C. was 100%. Furthermore, the residual ratio of the processing oil could be reduced to 61.5%.

  The experimental method of Example 3 of this experiment is that the temperature of the processing oil (4) at normal temperature is 32 ° C., and the temperature of the heated processing oil (4) is 71 ° C., 113 ° C., and 153 ° C. Except for this, it is the same as Example 1. The experimental results of Example 3 are shown in Table 4.

  As shown in Table 4, in Example 3, when the oil temperature of the processing oil (4) was increased from 32 ° C. to 153 ° C., the residual rate of the processing oil at 32 ° C. was 100%. Furthermore, the residual ratio of the processing oil could be reduced to 25.0%.

  FIG. 2 shows a graph of changes in the oil temperature of the processing oil and the residual ratio of the processing oil in Examples 1 to 3.

  As shown in FIG. 2, in all of Examples 1 to 3, by heating the processing oil (4), the residual ratio of the processing oil to the workpiece (12) was lowered. This is because the processing oil attached to the surface of the workpiece (12) comes into contact with the heated processing oil (4) in the storage tank (1), thereby causing the viscosity of the processing oil attached to the workpiece (12). This is because the removal of the processing oil adhering to the workpiece (12) is promoted. From this, it was proved that the amount of adhesion of the processing oil to the workpiece (12) can be reduced by heating the processing oil (4). Therefore, as in the present invention, by bringing the workpiece (12) to which the processing oil is adhered by the processing operation into contact with the heated processing oil (4) and heating the processing oil adhered to the workpiece (12), It was confirmed that the amount of processing oil attached to the workpiece (12) can be reduced.

  In the above-described Examples 1 to 3, the work oil (4) attached to the work piece (12) can be reduced by immersing the work piece (12) in the heated work oil (4). However, in Example 4, as shown in FIG. 3, the heated processing oil (4) is pressurized by the pump (13) and applied to the workpiece (12) not immersed in the processing oil (4). In contrast, the amount of processing oil adhering to the workpiece (12) can be reduced by injecting it. In this way, by injecting the processing oil (4) onto the workpiece (12), the weight loss efficiency of the processing oil adhering to the workpiece (12) can be further increased with the pressure of the injection. It becomes possible.

Moreover, since the weight reduction process of this invention is implemented in the pressure reduction state with less oxygen than a normal pressure state, it becomes possible to prevent the oxidative degradation of processing oil (4).

  In the fourth embodiment, as shown in FIG. 3, the storage tank (1) is provided with a heating mechanism (5) and a temperature sensor (9) for heating the processing oil (4). In Example 5, as shown in FIG. 4, a heating mechanism (5) and a temperature sensor (9) are provided in a heating tank (14) provided outside the storage tank (1). Then, the third on-off valve (15) is opened by a signal from the second liquid level sensor (17) disposed in the heating tank (14), and a part of the processing oil (4) in the storage tank (1) is removed. After introducing into the heating tank (14), the third on-off valve (15) is closed by a signal from the second liquid level sensor (17). And after heating the processing oil (4) introduce | transduced in the heating tank (14), this heated processing oil (4) shall be pressurized with a pump (13), and shall be injected to a workpiece (12). . By adopting such a configuration, out of the processing oil (4) stored in the storage tank (1), only the amount necessary for contact with the workpiece (12) is stored in the heating tank (14). Therefore, it is possible to save heating energy as compared with the case where all of the processing oil (4) in the storage tank (1) is heated. In this embodiment, as described above, the processing oil (4) is introduced from the storage tank (1) to the heating tank (14). However, in other different embodiments, it is provided separately. It is also possible to introduce the processing oil (1) from the tank into the heating tank (14).

DESCRIPTION OF SYMBOLS 1 Storage tank 4 Processing oil 5 Heating mechanism 12 Workpiece

Claims (12)

  The same processing oil as the processing oil used for processing the workpiece is heated to a temperature higher than the oil temperature at the time of the processing operation to reduce the viscosity, and the heated processing oil is converted into the processing oil by the processing operation. A process for reducing the amount of processing oil adhering to the workpiece, which reduces the amount of adhesion by reducing the viscosity of the processing oil adhering to the workpiece by bringing it into contact with the adhering workpiece. Method.   Stores the work to which the processing oil is attached by processing work, and places it in the storage tank or outside of the storage tank that enables the same processing oil as the processing oil used for processing the work to be contacted. It consists of a heating mechanism that lowers the viscosity by heating the same processing oil to a temperature higher than the oil temperature of the processing oil at the time of processing the workpiece, and the workpiece to which the processing oil is attached contacts the heated processing oil A processing apparatus for reducing the amount of the processing oil adhering to the workpiece, characterized in that by reducing the viscosity of the processing oil adhering to the workpiece, the amount of adhesion can be reduced.   The contact between the heated processing oil and the workpiece is performed as a pre-process of a cleaning process using a degreasing machine, and the amount of the processing oil adhering to the workpiece according to claim 1 is reduced. Processing method.   The contact between the heated processing oil and the workpiece is performed as a pre-process of a cleaning process using a degreasing machine, and the amount of the processing oil adhering to the workpiece according to claim 2 is reduced. Processing equipment.   The processing method for reducing the amount of the processing oil adhering to the workpiece according to claim 1, wherein the heated processing oil is cooled and reused for processing the workpiece.   The processing apparatus for reducing the amount of processing oil adhering to the workpiece according to claim 2, wherein the heated processing oil is cooled and reused for processing the workpiece.   The heating of the processing oil and the contact between the heated processing oil and the workpiece are performed in an inert gas atmosphere, and the amount of the processing oil adhering to the workpiece according to claim 1 is reduced. Processing method for.   The heating of the processing oil and the contact between the heated processing oil and the workpiece are performed in an inert gas atmosphere, and the amount of the processing oil adhering to the workpiece according to claim 2 is reduced. Processing equipment for.   The processing method for reducing the amount of the processing oil adhering to the workpiece according to claim 1, wherein the heating temperature of the processing oil is 50 ° C. to 200 ° C.   9. The processing apparatus for reducing the amount of processing oil adhering to a workpiece according to claim 2, wherein a heating temperature of the processing oil is 50 to 200 [deg.] C.   At the time of contact between the heated processing oil and the workpiece, the workpiece is rotated, oscillated, ultrasonic vibration, processing oil applied to the workpiece while the workpiece is immersed in the heated processing oil. A workpiece according to claim 1, 3 or 7, wherein one or a plurality of means for selectively injecting heated processing oil onto a workpiece not immersed in the processing oil or processing oil is selectively used. A processing method for reducing the amount of processing oil adhering to the workpiece.   At the time of contact between the heated processing oil and the workpiece, the workpiece is rotated, oscillated, ultrasonic vibration, processing oil applied to the workpiece while the workpiece is immersed in the heated processing oil. 9. The object according to claim 2, 4 or 8, wherein one or a plurality of means for selectively injecting heated processing oil onto a workpiece not immersed in the injection or processing oil is selectively used. Processing equipment to reduce the amount of processing oil adhering to the workpiece.