KR100628346B1 - Method of supplying process liquid in a machine tool and apparatus therefor - Google Patents

Abstract

The present invention provides a processing liquid supplying method and apparatus for greatly reducing the power consumption and power consumption of the pump 21 while maintaining the utility of the conventional processing liquid. ) And the processing liquid accumulated in the sub tank 20 provided at an appropriate height on the machine tool when intermittently supplying the processing liquid or the processing liquid s, such as the cleaning liquid, to a required location such as the workpiece w fixed thereto. (s) is flowed out by the gravity action and supplied to the required place, and on the other hand, the processing liquid s thus supplied is recovered in the main tank 19, and the processing liquid in the tank 19 is pumped. It carries out so that it may transfer to the sub tank 20 by (21).

Description

Process liquid supply method in a machine tool, and its apparatus TECHNICAL FIELD AND APPARATUS THEREFOR

BRIEF DESCRIPTION OF THE DRAWINGS The front view which abbreviate | omitted a part of process liquid supply apparatus in the machine tool which concerns on this invention.

2 is a side view of a processing liquid supply device in the machine tool.

3 is a view showing a processing liquid supply system of the machine tool.

4 is a view showing a processing liquid supply system of a conventional machine tool.

This invention relates to the processing liquid supply method in a machine tool, and its apparatus. Here, the treatment liquid means a treatment liquid or a washing liquid.

Fig. 4 shows an example of the processing liquid supply apparatus in the conventional machine tool, and recovers the processing liquid s supplied to the processing liquid supply necessary points such as the workpiece holder and the workpiece w fixed thereto. The tank 19 for carrying out the pump, the pump 21 for transferring the processing liquid s in the tank 19, and the processing liquid s transferred from the pump 21 to the processing liquid supply necessary location. A liquid passage means 22a for supplying at any time is provided.

Cut scraps generated during machining by a machine tool are attached to or deposited on the workpiece (w) or the work holder, but the cut scraps are used to accurately fix the next work (w) on the work holder. When the processing of (w) is finished, it is not necessary to remain on the workpiece holder, and in order to meet this need, the debris generated by machining during the processing of the workpiece (w) or at the end of the processing is carried out in the tank (19). In order to wash away the inflow portion of the c), the processing liquid s of a suitable pressure is continuously supplied through the pump 21 and the liquid passage means 22a at a flow rate equal to or greater than the required maximum flow rate. The processing liquid s thus obtained is also supplied to the friction point of the workpiece w and the cutting tool, as necessary.

In the supply of the processing liquid s by the above-described conventional pump 21 and the liquid passage means 22a, the discharge capacity of the pump 21 is at least instantaneous necessary for washing away the scraps. It is required to have a size that can be continuously supplied at a flow rate above the flow rate.

Now, the instantaneous maximum flow rate is Q1, the pressure at the time of outflow from the tip of the processing liquid passage means 22a is P0, and the pressure loss from the outlet of the pump 21 to the end of the passage passage 22a is P1. In this case, the power consumption W1 of the pump 21 is expressed by the following equation, that is,

W1 = kQl (P0 + P1)

Appears. Here, k is an integer and (P0 + P1) is the discharge pressure of the pump 21.

In an actual machine tool example, Q1 is about 200 L / min, and (P0 + P1) is about 0.3 MPa, so the power consumption of the pump is relatively large, and the consumption of the entire machine tool is consumed. More than about 25% of the power is not many.

This invention is made | formed in view of such a situation, and supplying process liquid (processing liquid or washing liquid), maintaining the ability to wash off the crumbs which arises from a machining process, and the lubrication ability to the lubrication required point at the time of processing. The purpose is to reduce the power required for the purpose.

In order to achieve the above object, in the processing liquid supplying method of the present invention, when a processing liquid such as a processing liquid or a cleaning liquid is intermittently supplied to a necessary part such as a workpiece holder or a workpiece fixed thereto, The processing liquid accumulated in the sub tank installed at the height flows out by gravity action to be supplied to the required place, and on the other hand, the processing liquid thus supplied is collected in the main tank, and the processing liquid in the main tank is pumped. To the sub-tank.

In this invention, the processing liquid of the quantity which roughly corresponded to the said one time supply amount is accumulate | stored in the sub tank at the start of processing liquid supply every time. Then, under the condition that the accumulated treatment liquid has a total head (for example, about 0.5 to 10 m) corresponding to the required discharge pressure, by the gravitational action, the workpiece holder or the workpiece fixed thereto. It is also supplied while maintaining flow above the maximum flow rate required. This supply works particularly effectively to wash away any work debris or cut debris attached to the work.

In addition, even when the supply of the processing liquid from the sub tank to the workpiece holder or the workpiece is stopped, the processing liquid can be transferred to the sub tank by the pump, and therefore, even a pump having a relatively small discharge capacity, the processing liquid of the required amount Is transported into the sub tank until it is needed.

Therefore, in the present invention, even if the pump has only a relatively small discharge capacity and the total head of the treatment liquid at any point in the sub tank is relatively small, washing and flowing out of the debris is performed exactly as in the prior art, and Lubrication of the required lubrication point is also performed exactly as in the prior art. For this reason, while the utility of the conventional process liquid is maintained, the power consumption of a pump will be drastically reduced compared with the past.

At this time, in the present invention, when the required amount of the processing liquid is accumulated in the sub tank, it is preferable to stop the transfer of the processing liquid by the pump. In this way, excess processing liquid is not transferred to the sub tank, and further, the power consumption of the pump is reduced.

In the apparatus of this invention which concerns on the above, the main tank which the process liquid, such as a process liquid and a washing | cleaning liquid supplied to the process liquid supply required part of the workpiece | work fixed stand and this fixed, flows into, and is identified from the said workpiece holder. A sub tank provided at a position as high as a distance to accumulate a processing liquid of an amount substantially matched to a one-time supply amount to the processing liquid supply necessary point, a pump for sending the processing liquid in the main tank to the sub tank; A liquid passage means for letting the processing liquid in the sub tank out by gravity action at any time toward the processing liquid supplying required portion is provided.

In the present invention, the processing liquid is supplied in such a manner that the processing liquid of the amount substantially coinciding with the one-time supply accumulated in the sub tank passes through the liquid passage means and flows out under the state having a relatively small total head and above the maximum flow rate at the required moment. It is supplied to the required place. This supply acts particularly effectively to wash away the workpiece holder or the cut debris attached to the workpiece, as already described.

After the one-time supply of the processing liquid in the sub tank flows out, the supply of the processing liquid from the sub tank is paused, but on the other hand, the pump continuously or continuously processes the processing liquid in the main tank into the sub tank. Transfer discontinuously. At this time, the transfer into the sub tank by the pump can be carried out even when the supply of the processing liquid from the sub tank is stopped. Therefore, even if the pump has a relatively small discharge capacity, the sub tank is capable of supplying the processing liquid more than once by the pump. It is conveyed until the supply start.

Therefore, even if the pump has only a relatively small discharge capacity, and the total head of the processing liquid in the sub tank is relatively small, the pumped wastes are washed off and lubricated as necessary. While the utility of the treatment liquid is maintained, the power consumption of the pump is significantly reduced as compared with the prior art.

The above invention can be embodied as follows.

In other words, the device is T1 for the one-time supply amount of the processing liquid when the intermittent processing liquid supply to the processing liquid supply necessary point is performed, and the outflow time for the processing liquid with the one-time supply amount to flow out from the sub tank toward the workpiece. And when the time from the outflow of the process liquid of the said one time supply amount to the outflow of the process liquid of the next one time supply amount is T2, the discharge flow volume Q of a pump is more than the value computed by the formula Qmin = Q1 * T1 / T2. In addition, it is set as the structure smaller than the maximum flow volume of the process liquid of the said one time supply amount.

According to this, the pump transfers the processing liquid in the main tank to the sub tank until the start of supply thereof after the outflow of the processing liquid of the one-time supply amount. At this time, the discharge flow rate Q of the pump being smaller than the maximum flow rate of the processing liquid of the one-time supply amount contributes to reducing the unnecessary power consumption of the pump.

In addition, the sub tank is set so that the bottom surface thereof may be raised about 0.5 m to about 10 m from the upper surface of the workpiece holder. In this case, the discharge pressure when the pump transfers the processing liquid from the main tank to the sub tank is reduced to about 1/10, for example, and in this case, the processing liquid to the processing liquid supply necessary point Supply is performed without any trouble. In addition, the reduction of the discharge pressure of the pump at this time contributes greatly to the reduction of the power consumption of the pump.

(Example)

In order to explain this invention in more detail, it demonstrates with reference to drawings.

1 to 3 show a processing liquid supply apparatus in a machine tool according to the present invention, FIG. 1 is a front view with a part omitted, FIG. 2 is a side view, and FIG. 3 shows a processing liquid supply system.

In these drawings, 1 is a base stand, 2 is a work fixture fixed on the base stand 1, 3 is a jig for fixing the work w on the work holder 2, And 4 is a workpiece processing means formed on the base 1.

The workpiece holder (2) is to fix the supporting members (5, 5) for supporting the workpiece (w) on the upper surface, and the processing liquid (s) flowing down the upper surface of the workpiece (w) or the holder (2) ) Is composed of a structure that collects by gravity and flows to another place.

The jig 3 is a horizontal member 9 which is constructed between left and right standing members 6 and 6 and upper ends of these members 6 and 6 with a shaft 7 and a fastening means 8 interposed therebetween. In addition to forming a pressing structure, the pressing beam member 10 in the front-rear direction is attached to the lower surface of the center of the length of the horizontal member 9, and the workpiece contact member at the front and rear ends of the pressing beam member 10. (11, 11) is attached, and when fixing the workpiece (w) on the workpiece holder (2) by fastening the fastening means (8) to the workpiece contact member (11, 11) the workpiece (w Press and attach to the upper surface and, on the other hand, when bringing or unloading the workpiece (w) onto the workpiece holder (2), swing the workpiece (w) by swinging the horizontal member (9) around the shaft (7). It consists of a configuration that makes it moveable.

And the workpiece processing means 4 is a guide track 12 in the front and rear direction fixed on the base 1, and a gang head (13) guided to the guide track 12 and moved back and forth The gang head 13 is rotatably mounted with a plurality of front and rear spindles 14, and has a motor 15 for driving the spindles 14 at the same time. 14) is fixed to the cutting tool (16).

17 is a processing liquid supply device in which the processing liquid is supplied to the upper surface of the workpiece holder 2 or the processing liquid supply necessary portion of the workpiece w fixed on the workpiece holder 2, and the workpiece It is for washing away the debris generated by the processing and for lubricating the friction points between the workpiece (w) and the cutting tool (16).

The processing liquid supply device 17 includes a filter box 18 through which the processing liquid s supplied to the workpiece w fixed to the workpiece holder 2 and the cut debris flow, and the filter box 18. The processing liquid s from which the debris cut out from the gas flows into the main tank 19 and the work fixing base 2 at a position high by a specific distance, A pump for sending the processing tank s of which the amount of processing liquid s approximately matches the one-time supply amount and the processing liquid s in the main tank 19 to the sub tank 20 ( 21 and a liquid passage means 22 in which the processing liquid s in the sub tank 20 is caused to flow out at any time toward the processing liquid supply necessary point by gravity action.

23 is a pipeline in which the filter box 18 and the main tank 19 communicate with each other, and the processing liquid s in the filter box 18 is introduced into the main tank 19 by gravity action. And 24 is a suction pipe of the pump 21, 25 is a bell mouse fixed to the lower end of the suction pipe (24).

The discharge flow rate Q of the pump 21 is determined as follows, that is, Q1 is the one-time supply amount of the processing liquid s when the intermittent processing liquid supply to the processing liquid supply necessary point is performed. The outflow time for the supply amount of the processing liquid s to flow out from the sub tank 20 toward the workpiece w is T1 and the processing amount of the next one supply amount from the outflow of the processing liquid s of the one-time supply amount. When the time to outflow of (s) is T2, it is larger than the Qmin value computed by Formula Qmin = Q1 * T1 / T2, and smaller than the supply flow volume of the process liquid of the said one time supply amount, Preferably, Qmin The size is almost equal to the value.

Reference numeral 26 denotes a conduit guided from the discharge port of the pump 21 to the sub tank 20, and a float open / close valve 27 is attached to the end of the conduit 26. The float open / close valve 27 is for stopping the flow of the processing liquid from the pump 21 into the sub tank 20 when the amount of the processing liquid s in the sub tank 20 reaches the above-mentioned one-time supply amount. 28 is a bypass line for overflowing the excess processing liquid s to the tank 19 when the processing liquid s is excessively supplied into the sub tank 20. As shown in the example of the example (FIGS. 1 and 3), the bypass pipe flows around the jig (workpiece periphery) on the fixed base 2, and contributes to eliminating outflow of cut debris and the like scattered to the periphery. I do it.

The sub tank 20 has a pair of left and right props such that the upper surface is opened to the atmosphere and the bottom surface 20a is positioned as high as a distance h of about 0.5 m to 10 m from the upper surface of the workpiece holder 2. (29, 29) is installed via, in fact, this distance (h) is made of about 2.5m to 3m to reduce the power consumption of the pump 21, and the capacity is made of about 1OL ~ 1OOL. .

The passage passage 22 is a passage extending downward from the passage opening and closing means 30 formed in the bottom surface 20a of the sub tank 20 and the outlet hole a of the passage opening and closing means 30. (31), a pair of branch conduits (32, 32) formed by branching the conduit (31) into two branches, and a nozzle (33) formed at the end of each branch conduit (32). When the furnace opening / closing means 30 is open, the processing liquid s of the one-time supply amount in the sub tank 20 flows into the conduit 31 and the branch conduits 32 and 32 by the gravity action, so that each nozzle ( It is supposed to prevent the processing liquid s in the sub tank 20 from flowing out into the conduit 31 when it is ejected over several tens of seconds from 33) and the flow passage opening and closing means 30 is closed.

At this time, the fluid passage opening and closing means 30 includes a valve body 34 for closing the outlet hole a formed in the bottom surface 20a of the sub tank 20, and a rod fixed with the valve body 34 ( 35 and a pneumatic cylinder device 36 for driving the rod 35 up and down, the valve body 34 is lifted and displaced by the short axis operation of the pneumatic cylinder device 36, and the outflow hole a This valve is in the open state, and the valve body 34 is downwardly displaced by the expansion operation of the pneumatic cylinder device 36, and the outlet hole a is closed.

The pneumatic cylinder device 36 supplies compressed air through an air supply conversion valve (not shown), and converts the air supply conversion valve by the control operation of the control device 37 provided at the rear end of the base 1. It works and stretches.

Each nozzle 33 is a round nozzle having a circular splitter having a diameter of 6 to 8 mm, a flat nozzle having a rectangular splitter composed of 4 mm long and 80 mm long and the like.

Next, the use example and operation | movement of above-mentioned apparatus of this invention are demonstrated.

In this example, it is assumed that the plurality of workpieces w are sequentially processed. Incidentally, the operation of each operating portion is arbitrary whether to be performed automatically or artificially by the control operation of the control device 37.

After fixing the first workpiece w to the workpiece holder 2 through the jig 3, the pump is rotated at all times, and the operation for processing the workpiece is started. Thereby, each spindle 14 is rotated, the gang head 13 is displaced to the left direction in FIG. 2, and the cutting tool 16 fixed to each spindle 14 is carried out of the workpiece | work w. Start cutting.

Immediately before the cutting tool 16 starts cutting the workpiece w, the fluid passage opening and closing means 30 of the fluid passage means 22 is opened. For this reason, the process liquid s previously accumulated in the sub tank 20 is gravity-actuated from each nozzle 33 through the outlet hole a, the conduit 31, and the branch conduits 32 and 32 by gravity action. It flows out continuously and is supplied toward the processing liquid supply necessary part of the workpiece holder 2 or the workpiece | work w fixed to this. Here, the processing liquid supply necessary point is a location where the supply of the processing liquid s is necessary in order to wash away the debris generated by the cutting of the workpiece w by the cutting tool 16, and the workpiece ( In order to lubricate the friction point of w) and the cutting tool 16, the point where supply of the process liquid s is needed. The flow rate in the supply of the processing liquid s always corresponds to the instantaneous maximum flow rate required in the supply of the processing liquid s to the conventional processing liquid supply required point. s) is supplied continuously during the cutting of the workpiece w by the cutting tool 16.

The supplied processing liquid s washes away the debris adhering to the workpiece holder 2, the workpiece w fixed thereto, and the like into the filter box 18, and at the same time, the friction of the workpiece and the cutting tool. Lubrication is needed at the point. The cut debris and processing liquid s which flowed into the filter box 18 separate and remove the debris cut out here, and the process liquid s after removing the cut debris flows into the main tank 19, and again, the pump It is conveyed in the sub tank 20 by 21.

And when cutting of the workpiece | work w by the cutting tool 16 is complete | finished, the flow path opening-closing means 30 is closed, and supply of the process liquid s in the sub tank 20 is stopped. Thus, the processing liquid s in the sub tank 20 flows out continuously from the opening operation of the opening and closing means 30 to the closing operation of the previous liquid passage, but the flow rate of the continuous single flow is the one-time supply amount. It means.

However, when the supply of the processing liquid s is stopped, the fixing of the workpiece w by the jig 3 is released, and the finished workpiece w is taken out to the next process, and then the next operation. Water (w) is carried in on the workpiece holder (2), and through the jig (3), the workpiece (w) is fixed similarly to the workpiece (w). Thereafter, the same processing is repeated.

In the above embodiment, the required instantaneous maximum flow rate Q1 of the processing liquid s flowing out of the sub tank 20 is 200 L / min, and one time of the processing liquid s flowing out of the sub tank 20. The time T1 required for the supply amount to flow out of the sub tank 20 is 20 seconds, and the time T2 from the outflow of the one-time supply amount of the processing liquid to the outflow of the next one-time supply amount of the processing liquid is 100. It is said to be seconds. The discharge capacity Q of the pump 21 corresponds to the Qmin value calculated by the formula Qmin = Q1 × T1 / T2, that is, 40 L / min, and includes the discharge pressure (the resistance of the pipe) of the pump 21. ) Is 0.06 MPa.

In the conventional processing liquid supply device shown in FIG. 4 corresponding to the above embodiment, the flow rate at the time of supplying the processing liquid s to the processing liquid supply required portion is always 200 L / min, which is the instantaneous maximum flow rate Q1. In addition, the discharge pressure of the pump 21 is about 0.3 MPa.

Under these conditions, the power consumption of the pump 21 is compared with the case of the above embodiment and the conventional case, as follows.

The power consumption (W) (kw) of the pump 21 is expressed by the formula W = k · Pt · Qt when the discharge pressure of the pump 21 is Pt (MPa) and the flow rate is Qt (L / min). appear.

Therefore, the ratio of the power consumption W1 of the conventional pump and the power consumption W2 of the pump of the said embodiment is

W1: W2 = (k × 0.3 × 200): (k × 0.06 × 40)

     = 60: 2.4

Becomes

As is clear from this result, the power consumption W2 of the pump of the above embodiment ends at 4% of the power consumption W1 of the conventional pump.

Next, the modification of the Example in this invention is demonstrated.

In the above embodiment, the processing liquid s is supplied from the sub tank 20 to the friction points of the workpiece w and the cutting tool 16, but lubrication of the friction points of the workpiece w and the cutting tool 16 is performed. In the case where the processing liquid is supplied from the inside of the main shaft 14, the processing liquid s flowing out from the sub tank 20 is not supplied to the friction point between the workpiece w and the cutting tool 16. Only supply the crumbs to wash off and shed.

Moreover, in dry cutting which does not lubricate the friction point of the workpiece | work and the cutting tool 16 at all, it is not necessary to use the processing liquid s which emphasizes lubricity in order to wash off the cut | disconnected debris. In this case, a well-known washing | cleaning liquid in which washing | cleaning is important can also be used as a processing liquid.

When the discharge flow rate of the pump 21 is larger than the Qmin, the need for constant rotation of the pump 21 during use of the machine tool is eliminated. In this case, the processing liquid accumulated in the sub tank 20 ( s) automatically stops its rotational operation when it reaches an amount larger than the one-time supply amount of the processing liquid supply from the sub tank 20, and also automatically starts the rotational operation when it becomes less than the one-time supply amount. You may. In this case, the float open / close valve 27 becomes unnecessary. In addition, the pump having a relatively small discharge capacity is continuously operated, and in this operation, the processing liquid is supplied in a slightly larger amount than the one-time supply amount required for the work of the workpiece in the sub tank 20 at all times. The liquid may be refluxed into the main tank through the bypass pipe, and it is within the scope of the practice of the present invention.

According to the present invention configured as described above, even if the pump has only a relatively small discharge capacity, and the total head of any point of the processing liquid in the sub tank is relatively small, it is precisely performed to wash away the debris that has been cut out. Lubrication to the required lubrication point is also performed accurately. Therefore, the rated output of the pump, its power consumption, and power consumption amount are compared with the conventional one, while maintaining the rinsing operation and the lubrication action in the same manner as before. It can greatly reduce.

Claims (6)

In a machine tool, when a processing liquid such as a processing liquid or a cleaning liquid is intermittently supplied to a necessary part such as a workpiece holder or a workpiece fixed thereto, the processing liquid that is accumulated in a sub tank installed at an appropriate height is applied to the gravity action. By flowing it out to be supplied to the required place, on the one hand, recovering the processing liquid thus supplied into the main tank, and transferring the processing liquid in the main tank to the sub tank by a pump; The instantaneous maximum flow rate required when supplying the treatment liquid to the required place is Q1, and the outflow time for the one-time supply amount of the treatment liquid to flow out from the sub tank toward the workpiece is determined from T1 and the outflow of the treatment liquid of the one-time supply amount. When the time until the outflow of the treatment liquid of the one-time supply amount is T2, the discharge flow rate Q of the pump is equal to or more than the value calculated by the formula Qmin = Q1 × T1 / T2, and the maximum of the treatment liquid of the one-time supply amount. The processing liquid supply method in a machine tool characterized by being smaller than the flow volume. The process liquid supply method according to claim 1, wherein when the required amount of process liquid is accumulated in the sub tank, the transfer of the process liquid by the pump is stopped. The processing liquid supply method according to claim 1, wherein when the processing liquid is excessively supplied into the sub tank, the processing liquid overflows and a part of the processing liquid is refluxed into the main tank. The main tank into which the processing liquid such as the processing liquid and the cleaning liquid supplied to the processing liquid supply necessary portion of the workpiece holder and the workpiece fixed thereto flows, and is installed at a position higher by a specific distance from the workpiece holder, and the processing The sub tank which accumulates the process liquid of the quantity which roughly corresponded to the one-time supply amount to a liquid supply required location, the pump for sending the process liquid in the said main tank to the said sub tank, and the process liquid in a sub tank are said process The liquid passage means which flowed out by the gravity action at the arbitrary time toward the liquid supply necessary part is provided, The instantaneous maximum flow rate required when supplying the processing liquid to the processing liquid supply necessary point is Q1, and the flow time for discharging the supply amount of the processing liquid from the sub tank toward the workpiece is T1, and the processing liquid of the processing amount of the one-time supply amount. When the time from the outflow to the outflow of the processing liquid of the next one-time supply amount is T2, the discharge flow rate Q of the pump is equal to or more than the value calculated by the formula Qmin = Q1 × T1 / T2, and the processing of the one-time supply amount The processing liquid supply apparatus in a machine tool characterized by being smaller than the maximum flow volume of the liquid. delete 5. The processing liquid supply device according to claim 4, wherein the sub tank is provided so that the bottom thereof is raised from about 0.5 m to about 10 m from the upper surface of the workpiece holder.

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