JP2016067997A - Processing line of workpiece - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain washing accuracy of a workpiece after cutting without increasing cost.SOLUTION: A manufacturing line of a workpiece includes a processing device 10 for cutting the workpiece, while supplying a coolant thereto, and washing equipment 20 for washing the workpiece to which a cutting work is applied in the processing device 10. The washing equipment 20 has a pre-washing station 23 for washing the workpiece with water, and a final washing station 24 for washing with a cleaning fluid, the workpiece washed in the pre-washing station 23.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a workpiece processing line, and more particularly to a processing line for cutting and cleaning a workpiece.

  For example, a cylinder block and a cylinder head of an engine are formed by casting, and then a predetermined part is cut to finish the part with a desired accuracy. At this time, in order to lubricate and cool the processed part, cutting is performed while supplying coolant to the processed part. Thereafter, the workpiece is cleaned with a cleaning liquid to remove cutting waste, coolant, and the like.

  For example, the following Patent Document 1 discloses a cleaning method and a cleaning apparatus for cleaning a work by spraying a cleaning liquid.

JP 2000-157939 A

  The cleaning liquid for cleaning the workpiece after processing as described above is usually recycled and used. On the other hand, since the coolant adheres to the workpiece after processing, the coolant is mixed with the cleaning liquid by cleaning the workpiece with the cleaning liquid. For this reason, by repeating the cleaning of a large number of workpieces, the concentration of the coolant in the cleaning liquid becomes high, the cleaning ability is lowered, and the cleaning accuracy cannot be maintained. In this case, since it is necessary to frequently replace the cleaning liquid in order to maintain the cleaning accuracy, the waste liquid increases and the cost increases, and the man-hour for cleaning liquid replacement increases, resulting in a decrease in productivity.

  In view of the above circumstances, the problem to be solved by the present invention is to maintain the cleaning accuracy of a workpiece after cutting without incurring high cost and low productivity.

  In order to solve the above-described problems, the present invention provides a machining apparatus including a machining apparatus that performs a cutting process while supplying a coolant to the workpiece, and a cleaning apparatus that cleans the workpiece that has been cut by the machining apparatus. The cleaning apparatus provides a workpiece processing line having a pre-cleaning station for cleaning the workpiece with water and a final cleaning station for cleaning the workpiece cleaned by the pre-cleaning station with a cleaning liquid.

  As the coolant supplied to the workpiece during the cutting process, a liquid having both cooling performance and lubrication performance is used, and oil is mainly used. Accordingly, a cleaning liquid for cleaning the workpiece after processing has a high performance for cleaning a coolant such as oil. For example, water is not suitable as a cleaning liquid because it has a low cleaning ability for removing oil and the like, and also causes water to adhere to a metal workpiece, which causes rust. In the present invention, after the workpiece is cut, the workpiece is pre-cleaned with water having a low cleaning performance, and the coolant adhering to the workpiece is roughly removed. By finally cleaning the workpiece that has been pre-washed with water in this way with the cleaning liquid, the amount of coolant mixed in the cleaning liquid can be greatly reduced, so that an increase in the concentration of the coolant in the cleaning liquid can be suppressed. Thereby, since the replacement frequency of the cleaning liquid can be greatly reduced, it is possible to maintain the cleaning accuracy while avoiding the high cost associated with the increase in the waste liquid and the decrease in productivity due to the increase in the number of man-hours.

  In the above production line, a coolant tank that stores a coolant used in the processing apparatus and a storage tank that stores water used for cleaning a workpiece in the pre-cleaning station are connected, and water in the storage tank is If the coolant tank can be supplied, the water used in the pre-cleaning can be replenished to the coolant for effective use. Further, although some coolant is mixed in the water used in the pre-cleaning, it can be effectively used by returning this coolant to the coolant tank.

  As described above, according to the present invention, it is possible to maintain the cleaning accuracy of a workpiece after cutting without incurring high costs or reducing productivity.

It is a top view showing typically the processing line concerning one embodiment of the present invention.

  As shown in FIG. 1, a processing line according to an embodiment of the present invention is provided with a processing device 10 that performs cutting on a workpiece, a cleaning device 20 that cleans the workpiece, and a conveyance unit that conveys the workpiece. . A conveyor, a robot arm, a transfer bar, or the like can be used as the conveying means. In this embodiment, the work is a cylinder block of an engine.

  The processing apparatus 10 stores processing means (not shown) for performing various types of cutting (honing, milling, drilling, etc.) on the workpiece, supply means (not shown) for supplying coolant to the processing site, and storing the coolant. A coolant tank 11. In the present embodiment, processing means for performing honing processing on the inner surface of the bore of the cylinder block as a workpiece is provided. Although the kind of coolant is not specifically limited, What mixed 7 to 8% of coolant stock solutions (for example, oil, especially water-soluble cutting oil) in water can be used, for example.

  The cleaning device 20 is provided on the downstream side of the processing device 10. In the cleaning apparatus 20, a carry-in station 21, a draining inversion station 22, a pre-cleaning station 23, a final cleaning station 24, an air blow station 25, and a carry-out station 26 are provided in order toward the downstream side.

  The draining reversing station 22 is provided with reversing means (not shown) for holding and reversing the workpiece. In the present embodiment, the cylinder block as the work is rotated around the crankshaft by the reversing means. Specifically, after the cylinder block is reversed 180 ° in one direction around the crankshaft by the reversing means, it is rotated 180 ° in the opposite direction and returned to the original posture. The method of rotating the cylinder block by the reversing means is not limited to this. For example, the cylinder block may be rotated 360 ° or more around the rotation axis.

  The pre-cleaning station 23 is provided with water cleaning means for cleaning the workpiece with water. In the present embodiment, the water washing means includes a water tank storing water and an immersion means for immersing the work in the water tank, and the work is cleaned by immersing the work in the water stored in the water tank. Furthermore, if a rotating means for rotating the workpiece in water is provided, the cleaning effect is enhanced. As the rotating means, one that rotates a workpiece, one that rotates a water tank, one that rotates (flows) water in the water tank, or the like can be adopted. The water washing means is not limited to the above, and for example, a means for spraying water on the workpiece can be adopted. However, in order to reliably remove the coolant at the back of the hole formed in the workpiece, it is preferable to wash the workpiece by immersing it in water as described above.

  A storage tank 27 is connected to the draining inversion station 22 and the pre-cleaning station 23. In the storage tank 27, the coolant discharged from the draining reversing station 22 and the water discharged from the pre-cleaning station 23 are stored. In addition, the storage tank 27 is connected to a coolant tank 11 provided in the processing apparatus 10, so that a liquid mixture of water and coolant in the storage tank 27 can be supplied to the coolant tank 11.

  The final cleaning station 24 is provided with cleaning means for cleaning the workpiece with the cleaning liquid. As the cleaning means, for example, one that sprays the cleaning liquid sprayed from the nozzle onto the work or one that cleans the work by immersing the work in the cleaning liquid stored in the container can be employed. The final cleaning station 24 is provided with a cleaning liquid tank 28 for storing the cleaning liquid supplied to the workpiece. The type and mixing ratio of the cleaning liquid are not particularly limited. For example, a mixture of 3 to 5% of a stock solution of cleaning liquid in water can be used.

  The air blow station 25 is provided with air blowing means for blowing air onto the workpiece.

  Next, a procedure for machining and cleaning the workpiece by the machining line having the above configuration will be described.

  First, a cylinder block as a workpiece is carried into the machining apparatus 10 (see arrow A in FIG. 1). And it cuts with the process means, supplying a coolant with respect to the process part of a workpiece | work. In the present embodiment, honing is performed on the bore of the cylinder block. Specifically, after the rough honing process is performed on the inner surface of each bore of the cylinder block, the finishing honing process is performed.

  At this time, the coolant stored in the coolant tank 11 is supplied to the machining site, and after cooling and lubricating the machining site, the coolant is stored below the workpiece. The used coolant is returned to the coolant tank 11 after removing foreign matters such as cutting chips by a cleaning device (not shown). Thus, in the processing apparatus 10, the coolant is used while being recycled.

  The workpiece that has been subjected to the predetermined processing in this manner is carried into the carry-in station 21 of the cleaning device 20. This work is transferred to the draining reversing station 22, held by the reversing means, and turned upside down. Thereby, the coolant accumulated in the concave portion of the work flows down from the work and is discharged to the storage tank 27.

  Next, the workpiece is transferred to the pre-cleaning station 23, and the workpiece is washed with water by the water washing means. Specifically, the cylinder block as a workpiece is rotated around the crankshaft in water by the rotating means while being immersed in the water in the water tank by the dipping means. By washing the workpiece with water in this way, the coolant adhering to the surface of the workpiece and the coolant accumulated in the concave portion of the workpiece are removed from the workpiece.

  The coolant removed from the workpiece by the pre-cleaning is mixed into the water in the water tank. Therefore, the concentration of the coolant contained in the water in the water tank increases as cleaning is repeated. And if the density | concentration of coolant becomes more than predetermined, or regularly, a part or all of the water (coolant mixed water) in a water tank will be discharged | emitted to the storage tank 27, and new water will be supplied in a water tank. Thus, the concentration of the coolant contained in the water in the water tank is always maintained below a predetermined level, and the cleaning performance in the pre-cleaning is maintained. In the present embodiment, once a day (for example, at the start of daily work), a predetermined amount of water in the water tank is discharged to the storage tank 27 and new water is replenished to the water tank.

  In this manner, the storage tank 27 stores the coolant mixed water obtained by mixing the coolant discharged from the drain drain reversing station 22 and the water discharged from the pre-cleaning station 23 (coolant mixed water). The coolant contained in the water stored in the storage tank 27 is very small, and the concentration of the coolant in the coolant mixed water is, for example, about 1%. And the coolant mixed water stored by the storage tank 27 is supplied to the coolant tank 11 of the processing apparatus 10 as needed. In the present embodiment, when the coolant in the coolant tank 11 is periodically replenished, a new coolant stock solution is supplied to the coolant tank 11, coolant mixed water is supplied from the storage tank 27, and these are mixed. A desired concentration of coolant is created. In this way, new water of the same amount as the coolant mixed water supplied from the storage tank 27 to the coolant tank 11 is supplied to the water tank of the pre-cleaning station 23. Thus, water can be effectively used by mixing the water used in the pre-cleaning station 23 with the coolant used in the processing apparatus 10. Further, the coolant can be effectively used by mixing the coolant removed from the workpiece in the draining reversing station 22 or the pre-cleaning station 23 with the coolant used in the processing apparatus 10.

  Next, the workpiece is transferred to the final cleaning station 24, and the workpiece is cleaned by the cleaning means. Specifically, for example, cleaning is performed by spraying the cleaning liquid stored in the cleaning liquid tank 28 onto the workpiece through the nozzle. The cleaning liquid used for cleaning the workpiece is returned to the cleaning liquid tank 28. Thus, the final cleaning station 24 uses the cleaning liquid while recycling it.

  At this time, the coolant remaining in the workpiece is mixed into the cleaning liquid used for cleaning the workpiece. However, in the present embodiment, as described above, the pre-cleaning station 23 is provided in front of the final cleaning station 24, and most of the coolant adhering to the workpiece is removed by previously cleaning the workpiece with water. Accordingly, the amount of coolant mixed in the cleaning liquid at the final cleaning station 24 is very small, and the replacement frequency of the cleaning liquid in the cleaning liquid tank 28 can be suppressed. In the verification of the present inventors, in the conventional production line that does not perform pre-cleaning with water, the cleaning liquid in the cleaning liquid tank is replaced every one to two months, but pre-cleaning with water is performed as in the present embodiment. Thus, the replacement frequency of the cleaning liquid in the cleaning liquid tank 28 could be extended to 6 months. Further, when the workpiece is washed with the washing liquid, water adhering to the workpiece is mixed into the washing liquid, but since the washing liquid originally contains water, this does not deteriorate the washing performance of the washing liquid.

  Thereafter, the work is transferred to the air blow station 25, and the cleaning liquid adhering to the work is blown off. This work is transferred to the carry-out station 26 and transferred to the next process by a separate transfer means (see arrow B in FIG. 1).

  The present invention is not limited to the above embodiment. For example, in the above embodiment, the draining reversing station 22 is provided in the cleaning device 20, but this may be omitted if not particularly required.

  In the above embodiment, the case where the storage tank 27 that stores the water used in the pre-cleaning station 23 and the coolant tank 11 of the processing apparatus 10 are connected is shown. However, the water in the storage tank 27 is supplied to the coolant tank 11. When not supplying, these do not need to be connected.

  In the above embodiment, the case where the workpiece is a cylinder block has been described. However, the present invention is not limited to this, and the present invention is applied to other metal parts (for example, a cylinder head) that are subjected to cutting and cleaning. be able to.

DESCRIPTION OF SYMBOLS 10 Processing apparatus 11 Coolant tank 20 Cleaning apparatus 21 Carry-in station 22 Drain drain inversion station 23 Pre-cleaning station 24 Final cleaning station 25 Air blow station 26 Carry-out station 27 Storage tank 28 Cleaning liquid tank

Claims (2)

A workpiece processing line comprising a processing device that performs cutting while supplying coolant to the workpiece, and a cleaning device that cleans the workpiece that has been subjected to cutting by the processing device,
The cleaning apparatus is a workpiece processing line having a pre-cleaning station for cleaning the workpiece with water and a final cleaning station for cleaning the workpiece cleaned by the pre-cleaning station with a cleaning liquid.   A coolant tank for storing the coolant used in the processing apparatus and a storage tank for storing water used for cleaning the workpiece at the pre-cleaning station can be connected to supply water from the storage tank to the coolant tank. The workpiece processing line according to claim 1.

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