JP4393327B2 - Cutting water treatment equipment - Google Patents

Description

  The present invention relates to a treatment apparatus for used cutting water generated during cutting of a product by a machine tool.

  The cutting water used at the time of machining contains a large amount of chips and cutting oil. Conventionally, this cutting water has been purified and reused by collecting chips on a chip conveyor and then passing through a filtration tank partitioned into a plurality of tanks. However, some of the chips that have not been collected by the chip conveyor may pass through the filtration tank and enter the cutting water tank of the processing machine through the liquid feed pump for the recovered cutting water. It is the cause of poor product quality due to powder chewing.

  In addition, the chips that could not be collected by the chip conveyor accumulate in the filtration tank and cause bacterial growth, resulting in a bad smell that the working environment deteriorates. In addition, drugs have been introduced to prevent the generation of rot odors, but it takes time to adjust the drug concentration.

  In Patent Document 1, the recovered coolant liquid (cutting water) is in communication between an inflow tank and an outlet tank by a cylinder bundle having a foreign matter levitation feed gradient formed including these two tanks. An apparatus for separating and recovering a coolant liquid is described that forms a series of tanks and two tanks that communicate with each other through openings having upper and lower edges that prevent stationary floating foreign substances and precipitated foreign substances.

  In Patent Document 2, when a plurality of partition plates partitioning the inside of the filtration tank are used to form a flow path in which liquid alternately flows, and when the metal is dry-cut into the plurality of filtration chambers formed by the partition plates, A grinding fluid filtration device filled with chips with an oil film attached is disclosed. Then, by passing through the filled chips, grinding dust in the grinding fluid is removed, and at the same time, the number of viable bacteria in the grinding fluid is greatly increased, thereby preserving and deodorizing the grinding fluid.

Furthermore, Patent Document 3 is provided with a coolant trough in which coolant (cutting water) circulates in one direction by a fluid jet nozzle so that chips do not settle at the lower part of the machine tool. A chip processing apparatus is described that is connected to a coolant tank that collects powder.
JP 2001-212734 A JP 2002-224959 A JP-A-6-106443

  In the apparatus disclosed in Patent Document 1, the flow rate of the liquid is high because the inflow tank and the next tank communicate with each other through an opening having upper and lower edges, and the precipitation of a large particle size and the small particle size There is a problem that the chips flow into the next tank without being sufficiently floated.

  Moreover, in the apparatus disclosed in Patent Document 2, it is necessary to fill each filtration chamber with chips with an oil film adhering to dry-cut irregularly shaped pieces, and to periodically replace the chips. There is a drawback that filling and exchanging is time-consuming compared to exchanging cutting water.

  Further, in the apparatus disclosed in Patent Document 3, there is no particular device in the coolant tank, and there is no description on how to separate the chips in the recovered coolant.

  The cutting water treatment apparatus of the present invention is a treatment apparatus for used cutting water generated when a product is machined by a machine tool, and this treatment apparatus has a filtration tank composed of a plurality of tanks partitioned by partition plates. The first tank into which the used cutting water is first introduced is divided into an upstream side and a downstream side by a partition plate having a shape in which only the vicinity of the tank bottom can pass water, and the downstream side of the first tank The partition plate that divides the second tank into which the cutting water is transferred has a shape that allows only the cutting water near the water surface to pass therethrough, and further includes the second tank and the third tank into which the cutting water is transferred next. The partition plate to be partitioned was provided with a hole for passing cutting water (for example, a circular hole) in the vicinity of approximately half of the water depth.

  Regarding the third tank, a plurality of continuous tanks are formed, and each of the partition plates partitioning each tank is preferably provided with a hole for passing cutting water in the vicinity of a half of the water depth. Further, it is preferable that the opening position of the hole for passing the cutting water is provided at a position different from the opening position of the adjacent partition plate in the horizontal direction.

  According to the cutting water treatment apparatus of the present invention, the inside of the first tank into which the used cutting water is first introduced is divided into an upstream side and a downstream side by a partition plate having a shape that allows only the vicinity of the tank bottom to pass through. The partition plate that divides the downstream side of the first tank and the second tank to which cutting water is transferred next has a shape that allows only cutting water in the vicinity of the water surface to pass through. The cutting water flowing down sinks in the bottom direction and then floats in the water surface direction. Furthermore, since the water-permeable opening of both partition plates is wide, the cutting water settles and floats relatively slowly. As a result, most of foreign matters such as chips and cutting oil contained in the cutting water can be separated in the first tank.

  Further, the partition plate that partitions the second tank and the third tank to which cutting water is transferred next allows water to pass through only the hole for cutting water passage provided in the vicinity of a half of the water depth. The flow rate of cutting water can be increased, and as a result, fresh air can be drawn in from the liquid surface to suppress the growth of bacteria. It is possible to efficiently distribute the entire system.

  Further, when a plurality of the third tanks are continuously formed, and the partition plate for partitioning each tank is provided with a circular hole for passing cutting water in the vicinity of about 1/2 of the water depth, cutting is performed. The chips in the water can be more completely eliminated, and the generation of bad odor is also improved.

Further, by providing the opening position of the hole for passing the cutting water at a position different from the opening position of the adjacent partition plate in the horizontal direction, even if the flow of the cutting water becomes zigzag in a narrow tank, the flow velocity Can be raised. As a result, it is possible to suppress the growth of the bacteria or to disperse the chemical solution throughout the filtration tank more efficiently.

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 is a conceptual diagram of a cross section showing an example of a cutting water treatment apparatus of the present invention, FIG. 2 is an enlarged cross sectional view of a filtration tank, FIG. 3 is a perspective view of a partition plate partitioning a third tank, and FIG. FIG.

The cutting water treatment apparatus 1 includes a filtration tank 2 and a pump 3 that collects filtered cutting water. The filtration tank 2 is composed of a plurality of tanks formed by being partitioned by a plurality of partition plates 4, and used cutting water generated during the cutting process is upstream separated by a partition plate 4 a of the first tank 5 on the left side of the drawing. Introduced on the side 5a. Then, the cutting water is fed in the direction of arrow A through the water channel provided in each partition plate 4 and finally sent to a cutting water tank (not shown) by the pump 3 and reused during machining.

  As shown in FIG. 2, the filtration tank 2 is partitioned by a partition plate 4 to form a plurality of tanks. The first tank 5 is divided into an upstream side part 5a and a downstream side part 5b by a partition plate 4a. The partition plate 4a has a shape that allows only the vicinity of the tank bottom to pass water. That is, the floating fine chips and cutting oil contained in the used cutting water charged into the upstream side portion 5a are suppressed from moving to the downstream side portion 5b by the partition plate 4a.

  Moreover, the partition plate 4b separating the downstream side portion 5b of the first tank and the second tank 6 has a shape that allows only cutting water near the water surface to pass therethrough. Therefore, the relatively large sedimentary chips contained in the used cutting water are suppressed from moving to the second tank 6 by the partition plate 4b.

  Thus, since the partition plate 4a and the partition plate 4b are combined in a stepped shape, the cutting water flowing from the upstream side portion 5a toward the downstream side portion 5b sinks in the bottom surface direction, and then floats in the water surface direction. To do. Furthermore, since the opening through which the partition plate 4a and the partition plate 4b can pass is wide, the cutting water sinks and floats while flowing relatively slowly. As a result, most of foreign matter such as chips and cutting oil contained in the cutting water can be separated in the first tank 5.

  In addition, the partition plate 4c that partitions the second tank 6 and the third tank 7 and the partition plate 4d that partitions the third tank 7 and the downstream tank are in the vicinity of approximately half the depth of the cutting water. A circular hole h for passing cutting water is formed in the plate.

  Since these partitions have only circular holes in their openings, the flow rate of cutting water can be increased. As a result, the growth of bacteria is suppressed by entraining fresh air from the liquid surface, and the chemical solution for sterilization is used. Can be used, the chemical solution can be efficiently dispersed throughout the filtration tank 2. In addition, since the flow rate of cutting water can be controlled by changing the diameter of the circular hole h, it is also possible to switch the pump 3 to a pump having a different capacity.

  In the present invention, a plurality of tanks similar to the third tank 7 formed by combining the partition plates 4 c and 4 d can be connected to the third tank 7. There is no limitation on the number of these tanks, and the larger the number of tanks, the more the chips in the cutting water can be completely removed and the generation of bad odor is improved, but there is a problem that the cleaning in the tank becomes complicated. Therefore, it is preferable to install 1 to 20 tanks, and further 5 to 10 tanks except for the third tank 7.

  The opening position of the circular hole h is preferably provided at a position different from the opening position of the adjacent partition plate 4 in the horizontal direction, as shown in FIGS. This will be described next. The dirty cutting water that has flowed into the upstream side 5a of the first tank 5 passes through the partition plate 4a and enters the downstream side 5b, passes over the partition plate 4b, and flows into the second tank 6. The cutting water then flows into the third tank 7 through the circular hole h, and this circular hole h is opened at a position near the left end of the partition plate 4c as shown in the figure. And in the partition plate 4d between the next tank, the circular hole h is provided in the position near the right end. That is, in the third tank 7, the cutting water moves from the left end to the right end in the tank.

  Similarly, in each tank after the third tank, the cutting water flowing in from the vicinity of the right end flows out from the vicinity of the left end to the next tank, and in the next tank, it flows in from the left end, so next flows out from the vicinity of the right end to the next tank. Thus, the position of the circular hole h is set so that the flow rate can be increased as much as possible even if the flow of the cutting water becomes zigzag in a narrow tank. Since the linear velocity is further increased by designing in this way, it is possible to suppress the growth of the bacteria or to disperse the chemical solution throughout the filtration tank 2 more efficiently.

  The cutting water treatment apparatus 1 of the present invention will be described in more detail with specific dimensions. In this example, the filtration tank 2 having the shape shown in FIG. 4 was used, and the depth of the filtration tank 2 was maintained at 250 mm and the depth of the cutting water was maintained at about 200 mm. And the circular hole h opened to the partition plates 4c, 4d, etc. was 40 mm in diameter, and the distance from the lower end of the circular hole h to the bottom surface was 80 mm. The pump 3 having a capacity of 130 liters / minute was used, and the flow rate was set to about 9.6 m / minute. And operation was performed for 3 months in this state.

As a result, fluid sludge in the next tank (equivalent to the second tank 6 in the filtration tank 2 of the present invention, which is the next tank after the cutting water input tank), which has accumulated about 40 kg per processing machine in three months in the conventional apparatus, is obtained. 0. Further, in the conventional apparatus, out of a total of 7 units, an average of 5 processing machines stopped per month due to chip biting, but this time it was 0 units. Furthermore, even after 3 months from the start of operation, the number of viable bacteria that cause malodor was normal at 1 × 10 ³ cells / ml or less, and no fungi were detected. For this reason, bad odors such as rot and odor were not generated, and machining could be performed smoothly without exchanging cutting water.

  By using the cutting water treatment device of the present invention, it is possible to prevent product quality defects due to chip biting, to reduce the frequency of cutting water replacement, and to improve the working environment by preventing the occurrence of bad odors such as spoiled odors. can do. Therefore, it can be suitably used for various machining for automobile parts, home appliances, and the like.

Sectional conceptual diagram which shows an example of the cutting water treatment apparatus of this invention Enlarged sectional view of the filtration tank Perspective view of partition plate for partitioning third tank Top view of filtration tank

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Cutting water processing apparatus, 2 ... Filtration tank, 3 ... Pump, 4 ... Partition plate, 5 ... 1st tank, 6 ... 2nd tank, 7 ... 3rd tank, h ... Circular hole.

Claims (1)

A processing apparatus for used cutting water generated during cutting of a product by a machine tool, the processing apparatus having a filtration tank composed of a plurality of tanks partitioned by a partition plate, wherein the used cutting water is first The inside of the first tank to be introduced is divided into an upstream side and a downstream side by a partition plate having a shape in which only the vicinity of the tank bottom can pass water, and the second side to which cutting water is transferred next to the downstream side of the first tank. The partition plate that divides the tank has a shape that allows only cutting water near the water surface to pass therethrough, and the partition plate that partitions the second tank and the third tank to which cutting water is transferred next has a depth of water. A hole for passing cutting water is provided in the vicinity of a depth of about 1/2, and a plurality of the third tanks are continuously formed, and all the partition plates that partition these continuous third tanks are approximately 1 / water depth. Holes for passing cutting water are formed in the vicinity of 2 depths, and these holes are adjacent That the partition plate cutting water treatment apparatus characterized by accelerating the different positions with lengthened flow velocity the flow path length as a flow path of a zigzag by the opening position and horizontal.