KR101063665B1 - Coolant heat exchanger for machine tools - Google Patents

Abstract

The present invention relates to a coolant heat exchanger of a machine tool, and more particularly, to a coolant heat exchanger of a machine tool in which the coolant injected between the tool and the workpiece is exchanged with a plurality of heat exchange tubes to cool.

The present invention has a cylindrical inner space of the upper and lower open while the one side is a heat exchange with the cutting oil inlet port is formed with a cutting oil discharge port is discharged coolant discharged temperature rises; A plurality of through passages crossing both ends of the main body; It is a passage through which the cooling fluid circulates and is detachably inserted into the inner space of the main body, and the cutting oil circulating flow path allows the cutting oil introduced into the main body through the cutting oil inlet of the main body to circulate inside the main body and be discharged through the cutting oil outlet. Forming a cooling cassette; Upper and lower body covers respectively fixed to upper and lower ends of the main body, and a connecting channel formed at an inner edge of the main body to communicate with the through flow passage and the cooling cassette to complete a series of cooling fluid circulation passages; A cooling fluid inlet tube installed in the upper body cover to introduce a cooling fluid into the cooling cassette or a through passage; And a cooling fluid discharge pipe installed at the upper body cover to discharge cooling fluid into the cooling cassette or the through flow path.

Coolant, Cooling, Heat Exchanger, Machine Tool, Cutting

Description

Cutting oil heat exchanger for machine tools

The present invention relates to a coolant heat exchanger of a machine tool, and more particularly, to a coolant heat exchanger of a machine tool in which the coolant injected between the tool and the workpiece is exchanged with a plurality of heat exchange tubes to cool.

In general, during cutting of a machine tool, high heat is generated due to strong friction between the tool and the workpiece, and the heat decreases the precision of machining due to the deformation of the workpiece itself as well as the change in the relative dimensions of the tool and the workpiece. Accordingly, in order to prevent such a problem, the cutting oil is supplied to the front end of the cutting tool to cool the tool. At this time, the cutting oil has a circulating supply structure that is supplied again in a cooled state through a predetermined path.

In the general coolant supply structure, the coolant stored in the tank is pumped by the pump motor to be sprayed between the tool and the workpiece through the supply pipe, and the injected coolant is exchanged with the workpiece to be heated on the bed of the workpiece to raise the temperature. After cooling through, it is recovered to the tank again. And the cutting oil pumped from the tank is to filter foreign matter by a filter installed in the tank.

As shown in Figure 1 and 2, the heat exchanger 10 according to the prior art is made of a cylinder having an open top and bottom and the coolant in which the temperature is increased by heat exchange with the coolant inlet (12a) and the coolant inlet coolant flows The main plate 12 having the discharged coolant outlet 12b formed therein, upper and lower plates 14 and 14a provided at upper and lower portions of the main body 12, and a cutting oil inflow pipe 16a into which cutting oil to be heat-exchanged is provided is provided with an upper plate ( 14 is provided with an upper cover 16 installed above the lower cover, a coolant outlet pipe 18a through which heat-cooled coolant flows out, and a lower cover 18 and an upper plate 14 installed below the lower plate 14a. It is composed of a plurality of heat exchange tubes (20) installed in communication with the lower plate (14a) to flow the cutting oil to be heat exchanged from the cutting oil inlet pipe (16a) to the lower portion of the lower plate (14a).

In addition, an upper space portion 22 is formed between the upper plate 14 and the upper cover 16 to store the cutting oil to be exchanged with the cutting oil inflow pipe 16a, and the lower plate 14a and the lower cover ( 18, a lower space portion 22a in which heat-exchanged cutting oil is stored is formed.

Looking at the heat exchange process of the conventional heat exchanger 10 configured as described above are as follows.

First, the coolant is introduced into the main body 10 through the coolant inlet 12a of the main body 12, and the cutting oil flows into the upper space 22 through the cutting oil inlet pipe 16a of the upper cover 16. It flows into the lower space part 22a through the heat exchange tube 20. The coolant is discharged through the coolant discharge pipe 18a in a state in which heat is exchanged with the heat exchange tube 20 during the flow of the heat exchange tube 20, and then flows back into the tank, and the coolant is heat-exchanged with the coolant and the temperature is increased. The furnace is discharged through the coolant outlet 12b and flows back into the coolant inlet 12a in a cooled state through a separate cooling cycle.

However, conventional heat exchangers have the following problems.

First, since a heat exchanger tube is integrally formed with an upper plate and a lower plate, various maintenance such as replacement and repair of each heat exchanger tube, as well as cleaning, is not possible, thus increasing the maintenance cost of the heat exchanger.

Second, since the heat exchanger follows a method in which the coolant moves inside the heat exchange tube while the heat exchange is performed, there is a problem in that the amount of cutting oil is small and the heat exchange area is small so that the heat exchange rate is low. In addition, in view of the recent rapid increase in the temperature of the coolant due to the high-speed rotation as the precision processing is required, the conventional heat exchanger does not sufficiently cool the coolant due to the low throughput of the coolant and the low heat exchange rate. The problem is that the tank becomes larger.

Third, since the conventional heat exchanger does not have a filtering device for removing foreign substances contained in the cutting oil by itself, foreign matter contained in the cutting oil circulates the heat exchanger with the cutting oil to damage the heat exchanger or block the flow path, thereby greatly improving the heat exchanger performance. There is a problem of dropping.

Fourth, in the conventional heat exchanger, the coolant remaining inside the heat exchanger which has been in operation in the winter is frozen, and the heat exchange tube is blocked, so that the coolant cannot circulate normally. Therefore, when the heat exchanger is restarted, an accident that the heat exchange tube bursts due to the pressure of the cooling water supplied to the heat exchange tube is performed without a separate warming process. Therefore, in winter, the user must bear the inconvenience of using the warming process when restarting.

The purpose of the present invention is to easily exchange and repair heat exchange tubes as well as various maintenance, such as cleaning is made individually, the throughput of the cutting oil is large, the cooling efficiency is high, and the foreign matter contained in the cutting oil is made easy to remove, In order to provide a coolant heat exchanger for machine tools that can be used without a separate warming process in winter.

Cutting oil heat exchanger of the machine tool according to the present invention in order to achieve the above object has a cylindrical inner space of the upper and lower openings on one side is formed with a cutting oil outlet for heat-exchanging the cutting oil inlet and heat exchanged with the cutting oil inlet; A plurality of through passages crossing the upper and lower ends of the main body; A coolant circulation passage is inserted into the inner space of the main body as a passage through which cooling fluid circulates, and the cutting oil introduced into the main body through the cutting oil inlet of the main body circulates inside the main body to be discharged through the cutting oil outlet. Cooling cassette to form; An upper main body cover fixed to an upper end of the main body and having a connection flow passage formed at an inner edge thereof to communicate with the through flow passages to complete a series of cooling fluid circulation flow passages; A lower main body cover fixed to a lower end of the main body, and having an inner side edge formed with a connecting flow passage communicating with the through flow passage and the cooling cassette to complete a series of cooling fluid circulation passages; A cooling fluid inlet pipe installed in the upper body cover to introduce a cooling fluid into the cooling cassette or a through flow path; And a cooling fluid discharge pipe installed at the upper body cover to discharge the cooling fluid into the cooling cassette or the through flow path.

The cutting oil heat exchanger of the machine tool according to the present invention configured as described above has the following effects.

First, the coolant heat exchanger of the machine tool according to the present invention is configured to be detachably detachable from the heat exchanger main body of the cooling cassette in which the heat exchanger tube is installed so that various maintenance such as replacement and repair of each heat exchanger tube and cleaning can be performed. There is an effect to reduce the maintenance cost.

Second, since the cutting oil heat exchanger of the machine tool according to the present invention follows the manner in which the cutting oil circulates inside the heat exchanger main body, unlike the conventional method in which the cutting oil moves inside the heat exchange tube and performs heat exchange, The large heat exchange area is also increased, and the heat exchange rate is greatly increased. As a result, it is possible to operate with only a small amount of coolant, thereby reducing the size of the heat exchanger and the coolant storage tank.

Third, the coolant heat exchanger of the machine tool according to the present invention has a fine hole is formed in the baffle plate and the foreign material discharge pipe for discharging the foreign matter passing through the fine hole in the lower cover of the cooling cassette to the outside in the process of cutting oil circulating Since foreign matter contained in the cutting oil is naturally filtered, foreign matter contained in the cutting oil circulates the heat exchanger together with the cutting oil, thereby preventing the phenomenon of damaging the heat exchanger or blocking the flow path.

Fourth, the coolant heat exchanger of the machine tool according to the present invention can be used while replacing the cooling cassette for the summer season using the coolant and the winter season using the cold air. Therefore, since the cold air is used in winter, unlike the conventional cooling water in the winter, the warming process, which is essentially performed at the time of restarting the heat exchanger, is not required in order to remove the frozen coolant remaining in the completed heat exchanger in the winter. It is easy to use.

The features and advantages of the present invention will become more apparent from the following detailed description of preferred embodiments with reference to the accompanying drawings. Prior to this, the terms or words used in the present specification and claims are defined in the technical spirit of the present invention on the basis of the principle that the inventor can appropriately define the concept of the term in order to explain his invention in the best way. It must be interpreted to mean meanings and concepts.

As shown in FIGS. 3 and 4, the cutting oil heat exchanger of the machine tool according to the present invention includes a main body 100 through which the cutting oil flows in and out, a through flow path 200 crossing the main body 100, and an interior of the main body 100. Cooling cassette 300 that is removably fitted in the space 110, upper and lower body covers 400 and 500 fixed to the upper and lower ends of the main body 100, and cooling installed in the upper body cover 400 The fluid inlet pipe 600 and the cooling fluid discharge pipe 700 is largely composed.

The main body 100 is vertically installed. The main body 100 has a cylindrical inner space 110 of which the upper and lower sides are open, and the cutting oil inlet 120 and the cutting oil outlet 130 are formed at one side thereof. The cutting oil inlet 120 is introduced into the cutting oil heat exchanged with the workpiece during the cutting operation to increase the temperature, and the coolant is discharged to the cutting oil discharge port 130 by circulating the inside of the main body 100 to exchange heat. In addition, the main body 100 has a plurality of through flow passages 200 crossing the upper and lower ends of the main body 100. The through flow paths 200 are formed at left and right edges of the main body 100 as passages through which cooling fluid circulates. In the present embodiment, the main body 100 is formed of a rectangular cross-section, and the through flow path 200 is formed and a total of four formed at each corner, but an example, but the shape of the main body 100 or the number of the through flow path 200 is Without being limited to this, it can be made in various shapes and numbers as necessary.

The cooling cassette 300 is a passage through which the cooling fluid circulates together with the through passage 200 of the main body 100, and is detachably fitted to the internal space 110 of the main body 100. In addition, the cooling cassette 300 is inserted into the main body 100 and the cutting oil introduced into the main body 100 through the cutting oil inlet 120 of the main body 100 circulates inside the main body 100 to allow the cutting oil discharge port ( The coolant circulation flow path is formed to be discharged through the air 130.

Upper and lower body covers 400 and 500 are fastened by screwing to upper and lower ends of the main body 100, respectively. 5A and 5B, a connection passage 410 is formed at the inner edge of the upper body cover 400 to communicate the through passages 200 to complete a series of cooling fluid circulation passages. In addition, a through hole is formed in the center of the lower body cover 500 so that the cooling cassette is fitted, and an inner side edge connects the through passage 200 and the cooling cassette 300 to complete a series of cooling fluid circulation passages. 510 is formed.

In addition, the upper body cover 400 is coupled to the cooling fluid inlet pipe 600 for introducing a cooling fluid into the cooling cassette 300 or the through flow path 200 on the left side of the center, coupled to the right side The cooling fluid discharge pipe 700 for discharging the cooling fluid heat-exchanged from the inside of the cooling cassette 300 or the through passage 200 is penetrated in a watertight state.

In addition, the upper body cover 400 is formed with a screw hole 401 for fastening the bolt with the upper cover of the cooling cassette 300 to be described later.

The cooling cassette 300 according to the present invention is configured differently as follows according to the type of cooling fluid.

(Embodiment 1)

6 and 8, the cooling cassette 300a according to the present embodiment is suitable when the cooling fluid is cooling water.

The cooling cassette 300a is assembled to the internal space 110 of the main body 100 through a through hole formed in the center of the lower body cover 500.

The cooling cassette 300a is disposed at regular intervals in the vertical direction, and a baffle plate in which the coolant flow passages are formed in different directions so that the coolant introduced into the body 100 through the coolant inlet 120 circulates with a constant orientation. A plurality of heat exchange tubes 320 passing through the assembly 310, a cooling fluid introduced through the cooling fluid inlet pipe 600, and passing through the baffle plate assembly 310, and an upper end of the heat exchange tubes 320. The upper cover is fastened to the upper end of the upper O-ring disc 330 while having upper and lower O-ring discs 330 and 340 respectively fitted to the lower end and an inner space 350b communicating with the open upper ends of the heat exchange tubes 320. And a lower cover 360 which is fastened to the lower end of the lower o-ring disc 340 while having an internal space 360a communicating with an open lower end of the heat exchange tubes 320.

Meanwhile, a through hole 350c is formed in the upper cover 350, and a fastening hole 330a formed corresponding to the through hole 350c is formed in the upper o-ring disc 330 to be firmly coupled through a fastening bolt. It is supposed to be. In addition, the through hole 360b is formed in the lower cover 360 so that the lower O-ring disc 340 and the fastening bolt can be firmly coupled.

The baffle plate assembly 310 includes an intermediate plate 311 for dividing the internal space 110 of the main body 100 into first and second quadrants on the left side and third and fourth quadrants on the right side, and the intermediate plate 311. The first baffle plate 312 is coupled to the upper end of the cutting oil passage portion formed in the first quadrant of the left rear, and spaced apart from the bottom of the first baffle plate 312 so that the cutting oil passage portion is formed in the second and fourth quadrants. A pair of second baffle plates 313 and 313 respectively coupled to the intermediate plate 311 and the intermediate plate at a predetermined interval from below the second baffle plate 313 to form a cutting oil passage portion in the first and third quadrants. A pair of third baffle plates 314 and 314 respectively coupled to 311 and the intermediate plate 311 at a predetermined interval from below the third baffle plate 314 to form a cutting oil passage in the second and fourth quadrants. A pair of fourth baffle plates 315 and 315 respectively coupled to the lower plate and a lower portion of the intermediate plate 311, and the coolant passage portion is formed in the first quadrant. A is composed of a fifth chopping peulpan 316. In this case, the coolant inlet 120 is positioned above the first baffle plate 312, and the coolant outlet 130 is positioned between the first baffle plate 312 and the second baffle plate 313. . Heat exchange tube through-holes 301 are formed on the front surfaces of the baffle plates 312 to 316.

 Therefore, by the baffle plate assembly 310, the internal space 110 of the main body 100 is introduced into the main body internal space 110 through the coolant inlet 120 to allow the main body 100 to be opened by the intermediate plate 311. A cutting oil circulation passage is formed to be circulated by circulating from side to side through the cutting oil outlet 130, and the cutting oil repeats the flow of the cutting oil in the forward and backward directions according to the position of the cutting oil passage. Circulate 110 evenly from left to right.

In the present embodiment, the first quadrant means the left rear portion based on FIG. 3, and the second quadrant, the third quadrant, and the fourth quadrant are located in the counterclockwise direction.

Meanwhile, a plurality of fine holes 317 are formed in the fifth baffle plate 316 positioned at the bottom of the baffle plate assembly 310 so that foreign matters contained in the cutting oil are collected at the lower end of the internal space 110 of the main body 100. To further form, it is preferable that the foreign substance discharge pipe 365 is coupled to the lower O-ring disc 340 so that foreign substances gathered at the lower end of the inner space 110 of the main body 100 can be discharged to the outside. To this end, the lower O-ring disc 340 and the lower cover 360 are formed with a fastening hole 347 and a through hole 361 through which the foreign substance discharge pipe 365 passes. Therefore, the cutting oil, which has passed through the cutting oil passage part of the fifth baffle plate 316 on the left side and moves to the lower end of the internal space 110 of the main body 100, is transferred to the fourth baffle plate 315 on the right side through the micropores 317. Although the foreign matter contained in the cutting oil is collected in the lower portion of the inner space 110 of the main body 100 while not passing through the micro-pores 317, the user periodically opens the foreign substance discharge pipe 365 to the main body 100 The foreign matter gathered at the bottom of the inner space 110 can be easily and quickly discharged to the outside.

The upper and lower O-ring discs 330 and 340 are formed with fitting holes 331 and 341 to which the top and bottom of the heat exchange tubes 320 are fitted. The hole nuts 332 are fastened to the fitting holes 331 and 341 so as to be in close contact with both ends of the heat exchange tube 320. Cooling fluid passes through the hole of the hole nut 332, and a wrench can be inserted into the hole to easily assemble the upper and lower O-ring discs 300 and 340. A watertight packing is disposed between the hole nut 332 and the end of the heat exchange tube 320 to closely maintain the space between the heat exchange tube 320 and the upper and lower O-ring discs 330 and 340. To this end, the conical spaces 331a and 341a are further formed in the fitting holes 331 and 341.

The watertight packing is located between the conical packing 333 inserted into the conical space portions 331a and 341a and between the conical packing 333 and the hole nut 332 so that the hole nut 332 is fitted. When it is fastened to the (331,341) is pushed in the hole nut 332 to enter the fitting holes (331,341) is in close contact with the conical packing 333, the conical packing 333 is elastic to be in close contact with the conical space portion (331a, 341a) It consists of a secondary packing 334 to deform.

On the other hand, as shown in Figure 6 and 7, the main body 100 and the upper, lower O-ring disc 330, 340 to improve the watertightness of the upper, lower O-ring disc 330, 340 on the side of the first annular groove ( 335 and 345 may be further formed, and second and second annular grooves 336 and 346 may be further formed at upper and lower edges of the upper and lower o-ring discs 330 and 340 so as to communicate with the first annular grooves 335 and 345. In this case, a pair of inclined springs 338 disposed to face each other with the O-rings 337 positioned at the center thereof are inserted into and coupled to the first annular grooves 335 and 345, respectively. The upper and lower annular projections can press the inclined spring 338 through the second annular grooves 336 and 346 of the upper and lower o-ring discs 330 and 340 in the process of being fastened to the upper ends of the upper and lower o-ring discs 330 and 340. (351,362) is preferably formed. In this configuration, when the upper and lower covers 350 and 360 are fastened to the upper and lower o-ring discs 330 and 340, respectively, the inclined springs 338 are pressed against the annular protrusions 351 and 362 so as to be in close contact with the inner surface of the main body 100. Since it is deformed (deformed), the watertight between the main body 100 and the upper and lower O-ring discs 330 and 340 is made reliably.

Further, the inclined spring 338 is formed with a cutout 338a. The incision 338a is slightly opened when the inclined spring 338 is pressed to the annular protrusion to induce elastic deformation (bending) of the inclined spring 388, and incline springs when disassembling the upper and lower oval discs 330 and 340 ( The upper and lower O-ring discs 330 and 340 may be easily disassembled by making the upper and lower O-ring discs 330 and 340 and the main body 100 not in close contact with each other.

And, the upper surface of the upper cover 350 is formed with a screw hole (350a) for screwing the upper body cover 400, the cooling fluid inflow cooling fluid flows from the cooling fluid inlet pipe 600 The cooling fluid discharge hole 353 through which the cooling fluid is discharged from the ball 352 and the cooling fluid discharge pipe 700 is formed. Cooling fluid inlet pipe 600 and cooling fluid discharge pipe 700 are fastened to the cooling fluid inlet hole 352 and the cooling fluid outlet hole 353 through screwing, respectively.

The cooling fluid inlet hole 352 is formed on the left side with respect to the center of the upper cover 350 and the cooling fluid discharge hole 353 is formed on the right side. In addition, the internal fluid 350b of the upper cover 350 communicating with the open upper ends of the heat exchange tubes 320 is discharged through the cooling fluid and the cooling fluid discharge hole 353 introduced through the cooling fluid inlet hole 352. An intermediate plate 354 is formed to partition the cooling fluid. In addition, the inner space 360a of the lower cover 360 communicating with the open lower ends of the heat exchange tubes 320 is provided with an intermediate plate 363 formed on the same plane as the intermediate plate 354 of the upper cover 350, and the side portion thereof. A communication hole 364 is formed in the inner space 360a and the connection passage 510 of the lower body cover 500 to communicate with each other.

The heat exchange tubes 320 are heat exchange tubes 320 communicating with the cooling fluid inlet hole 352 based on the middle plates 354 and 363 of the upper cover 350 and the lower cover 360 (hereinafter, 'left heat exchange tubes'). And heat exchange tubes 320 communicating with the cooling fluid discharge hole 353 (hereinafter referred to as 'right heat exchange tubes').

(Second Embodiment)

The cooling cassette 300b according to the present embodiment is suitable when the cooling fluid is cold air.

9 and 10, the cooling cassette 300b includes a plurality of baffle plate assemblies 310, a plurality of heat exchange tubes 320, upper and lower O-ring discs 330 and 340, and the upper O-ring. An upper cover 370 fastened to the upper end of the disc 330, an upper middle cover 355 fitted into an inner space of the upper cover 370, and a lower cover 380 fastened to the lower end of the lower o-ring disc 340. ) And a lower middle cover 385 fitted into an inner space of the lower cover 380.

Here, the baffle plate assembly 310 and the heat exchange tube 320 and the upper and lower O-ring discs 330 and 340 may be formed on the baffle plate assembly 310 and the heat exchange tube 320 constituting the cooling cassette 300a of the first embodiment. The lower O-ring discs 330 and 340 and the configuration and operation are the same, so detailed description thereof will be omitted.

In the present embodiment, inside the upper middle cover 355, first communication grooves 355a are formed to communicate an open upper end of a pair of adjacent heat exchange tubes 320. The upper cover 370 has an inner space for accommodating the upper middle cover 355, and has the same configuration except that the intermediate plate 354 is excluded as compared with the upper cover of the first embodiment.

In addition, inside the lower middle cover 385, second communication grooves 385a are formed on the inner surface of the lower middle cover 385 so as to communicate the open lower ends of the pair of adjacent heat exchange tubes 320 to form a single flow path. It is. In addition, the side of the lower cover 380 and the connection passage 510 of the lower body cover 500 in communication with the through flow passage 200 connected to the cooling fluid inlet pipe 600, and the first end of the single channel Cooling fluid inlet communication hole (385c) for communicating the two communication grooves (385b), the connecting flow passage 510 of the lower body cover 500 in communication with the through-flow passage 200 connected to the cooling fluid discharge pipe 700 and the single A cooling fluid discharge communication hole 385e communicating with the second communication groove 385d forming the end of the flow path is formed. The lower cover 380 has an inner space for accommodating the lower middle cover 385 and has the same configuration except that the intermediate plate 363 is excluded as compared to the lower cover 360 of the first embodiment. consist of. Reference numeral 385f is a passage hole of the foreign substance discharge pipe 365.

Meanwhile, a through hole 370a is formed in the upper cover 370, and a through hole 356 corresponding to the through hole 370a is formed in the upper middle cover 355 and the upper o-ring disc 330. A fastening hole 330a formed corresponding to the through hole 356 is formed in the upper cover 370 and the upper O-ring disc 330 through the fastening bolt. In addition, a through hole 380a is formed in the lower cover 380, a through hole 386 corresponding to the through hole 380a is formed in the lower middle cover 385, and the through-oring disc 340 is formed through the through hole 380a. A fastening hole (not shown) corresponding to the hole 386 is formed so that the lower cover 380 and the lower O-ring disc 340 can be firmly coupled with the fastening bolt.

On the other hand, the cooling fluid inlet pipe 600 is provided with an air cooler 390 to supply cold air stably and efficiently. A vortex tube is suitable as the air cooler 390. Because the vortex tube is a cooling device that separates the air into cold and warm air streams when it is supplied with compressed air, it is small, light, inexpensive to install and operate, can be freely controlled and does not use refrigerant, electricity or chemicals. It is because there are many advantages that are fundamentally safe.

In addition, the cooling fluid discharge pipe 700 is preferably further provided with a vacuum generator (395) for suctioning the cold air at a constant pressure so that the circulation of cold air smoothly and stably. The vacuum generator 395 is suitable for a conventional E-Vac vacuum generator that is small in size and consumes only a minimum of compressed air while maintaining a constant vacuum degree rather than a mechanical vacuum method in which the degree of vacuum is changed.

FIG. 11 is an exploded perspective view showing another embodiment of the baffle plate assembly, and as shown, the baffle plate assembly 800 includes an inner space 110 of the main body 100 of the first and second quadrants on the left side and the right side. The intermediate plate 810 bisected into third and fourth quadrants, the first baffle member 821 fixed to the upper left end surface of the intermediate plate 810 and the cutting oil passage portion formed in one quadrant, and the intermediate plate 810 The first baffle plate 820 made of a second baffle member 822 fixed to the upper right end surface, and a predetermined interval from the lower side of the first baffle plate 820 so that the cutting oil passage portion is formed in the second and fourth quadrants. A pair of second baffle plates 830 respectively coupled to the intermediate plate 311 and the intermediate plate at regular intervals from below the second baffle plate 830 to form a cutting oil passage in the first and third quadrants. A pair of third baffle plates 840 respectively coupled to 810 and a lower portion of the third baffle plate 840 so that the coolant passage part is formed in the second and fourth quadrants. A pair of fourth baffle plates 850 coupled to the intermediate plate 810 at predetermined intervals, and a ninth baffle member fixed to the left side of the intermediate plate 810 and having a cutting oil passage formed in one quadrant ( 861 and a fifth baffle plate 860 consisting of a tenth baffle member 862 fixed to the right side of the intermediate plate 810. In this case, the coolant inlet 120 is positioned above the first baffle plate 312, and the coolant outlet 130 is positioned between the first baffle plate 312 and the second baffle plate 313. .

Reference numeral 801 denotes a heat exchange tube through-hole, and 802 denotes a bolting flange extending from each baffle plate 820 to 860 so that the bolt can be bolted to the intermediate plate 810.

When the baffle plate assembly 800 is configured as described above, all the heat exchange tubes 320 are simultaneously coupled to the baffle plate assembly 800 without being penetrated through the intermediate plate 810 in the horizontal direction. Each baffle plate (820 ~ 860) is easy to absorb the assembly tolerance with the heat exchange tube (320). Therefore, the heat exchange tubes 320 can be easily passed through the baffle plate assembly 800.

On the other hand, in the third and fourth bent members 861 and 862 of the fifth baffle plate 860, a plurality of micropores 863 to allow foreign substances contained in the cutting oil to be moved to the lower end of the inner space 110 of the main body 100. This can be further formed. In this case, the lower O-ring disc 340 of the cooling cassette 300b is coupled with a foreign substance discharge pipe 365 for discharging the foreign substances that have passed through the micropores 863 to the outside.

Meanwhile, each of the baffle plates 820 to 860 may have at least one cut line 870 passing through the heat exchange tube through hole 801 to be developed around the heat exchange tube through hole 801 formed on the front surface. . In this case, the baffle plates (820 to 860) are fixed in advance, and a plurality of heat exchange tubes 320 over 1 meter are fitted into the heat exchange tube through-holes 801 while being fitted into each other. Damage to the 320 or assembly inconveniences can be solved at once. That is, after assembling the baffle plates 820 to 860 to the intermediate plate 810 with screws in advance, the heat exchange tubes 320 are placed on the incision in the state of cutting the respective baffle plates 820 to 860 and the incisions are matched. Since the heat exchange tubes 320 are sequentially assembled from the bottom in such a manner, the heat exchange tubes 320 may be quickly assembled to the baffle plate assembly 800 without any damage.

In this case, it is preferable that the recess 880 is formed at the end of the incision line 870 so that the incision is made more easily. In addition, the baffle plates 820 ˜ 860 are preferably made of a synthetic resin material having excellent heat resistance because the baffle plates 820 to 860 should be re-increased after being cut.

In addition, the baffle plates 820 to 860 may be made of a thin aluminum material, and the material is not necessarily limited thereto.

Cutting oil heat exchanger of the machine tool of the present invention having such a configuration can be used efficiently while replacing with different cooling cassettes 300 according to the summer and winter. That is, in summer, a cooling cassette 300a having a cooling fluid is used, and in the winter, a cooling cassette 300b having a cooling water is used. The reason for using the cooling cassette 300b which uses the cool air as the coolant instead of the coolant in the winter is that when the cool air is used as the coolant, the coolant is frozen inside the heat exchanger which has been finished in the winter, damaging the device and starting work. This is because the warming process for melting the frozen water can be omitted.

Therefore, the cooling fluid inlet pipe 600 and the cooling fluid discharge pipe 700 are installed in the upper body cover 400 to distinguish between summer and winter. That is, the cooling fluid inflow pipe 600 is installed at a position to allow the cooling fluid to flow into the interior of the cooling cassette 300a in the summer, and the position at which the cooling fluid can be introduced into the through flow path 200 during the winter season. Is installed on. In addition, the cooling fluid discharge pipe 700 is installed at a position capable of discharging the cooling fluid from the inside of the cooling cassette 300a in the summer, and is installed at a position capable of discharging the cooling fluid from the inside of the through flow path 200 in the winter season. do.

On the other hand, if the cooling fluid inlet pipe 600 and the cooling fluid discharge pipe 700 is installed in the same manner as described above, since there is a closed end to be produced for the summer and winter, respectively, as shown in FIG. B. The cooling fluid inlet pipe 600 and the cooling fluid discharge pipe 700 communicate with the inside of the cooling cassette 300 and the inside of the through flow path 200 so that the upper body cover 400 can be used as the winter season. It is desirable to form both in position and to be able to selectively open and close according to the summer and winter.

In the summer season, the cooling cassette 300a according to the first embodiment is installed. In this case, the upper cover 350, the left heat exchange tube 320, the lower cover 360, the lower body cover 500, and the left through flow passage 200 are sequentially passed from the cooling fluid inlet tube 600, and then the upper body again. Through the cover 400, the right through passage 200, the lower body cover 500, and the lower cover 360, a series of leads to the cooling fluid discharge pipe 700 through the right heat exchange tube 320 and the upper cover 350 It has a cooling fluid circulation passage.

It looks at in detail the process of circulating the cooling water through the circulation passage as described above.

First, as shown in FIG. 8, when the cooling water flows into the upper cover 350 through the cooling fluid inlet tube 600, the introduced cooling water is introduced into the left heat exchange tube by the middle plate 354 of the upper cover 350. It passes through the inside of the left heat exchange tubes 320 through the open top of the 320. The coolant is first heat exchanged with the cutting oil circulating along the outside of the left heat exchange tube 320 in the course of passing through the left heat exchange tubes 320. Cooling water exiting the open lower portion of the left heat exchange tube 320 is introduced into the inner space of the lower cover 360 and then through the communication hole 364 formed on the left side by the intermediate plate 363 of the lower cover 360. It is introduced into the lower body cover 500.

After the coolant flowing into the lower body cover 500 flows into the lower end of the left through passage 200 formed at the left edge of the main body 100 through the left connection passage 510 formed at the left edge of the lower cover 360. The upper portion of the main body 100 is moved along the left through passage 200 to be discharged into the upper body cover 400 through the left connecting passage 410 of the upper body cover 400. The coolant discharged into the upper main body cover 400 is moved to the right connecting channel 410 formed at the right edge of the upper main body cover 400 by the discharge pressure, and the main body 100 through the connecting channel 410. It is introduced into the through flow path 200 formed at the right edge of the movement to the lower end of the main body 100. The coolant moved to the lower end of the main body 100 is connected to the inside of the lower cover 360 through a communication hole 364 formed at the right side of the lower cover 360 through the right connection passage 510 of the lower body cover 500. The cooling water introduced into the lower cover 360 flows into the lower end of the right heat exchange tube 320 due to the middle plate 363 of the lower cover 360 and then through the open upper portion of the upper cover 350. It is discharged to the internal space 350b. The cooling water is secondarily exchanged with the cutting oil circulating along the outside of the right heat exchange tube 320 in the course of passing through the right heat exchange tube 320. Cooling water discharged to the upper cover 350 in the state of secondary heat exchange is discharged to the outside through the cooling fluid discharge pipe 700 by the intermediate plate 354 of the upper cover 350. Although not shown, the cooling water discharged to the outside is introduced through the cooling fluid inlet pipe 600 while being cooled again through a predetermined cooling cycle to repeat the above circulation.

As such, since the cooling water has a long circulation passage that continuously passes through the left and right sides of the main body 100 through the edge of the main body 100, the contact time with the cutting oil is long, and thus the cooling efficiency of the cutting oil is further improved.

On the other hand, the coolant is heat-exchanged with the workpiece while the coolant repeats a series of circulation as described above flows into the internal space 110 of the main body 100 through the cutting oil inlet 120 of the main body 100 do. The cutting oil introduced into the internal space 110 of the main body 100 passes through the cutting oil passage of the first baffle plate 312 and the cutting oil passage of the second baffle plate 313 on the left side and the cutting oil of the third baffle plate 314. Heat exchange tubes 320 which sequentially pass through the baffle plates 312 to 316 while sequentially passing through a passing portion, a cutting oil passage portion of the fourth baffle plate 315, and a cutting oil passage portion of the fifth baffle plate 316; Primary heat exchange takes place. Subsequently, after the second heat exchange while passing through the coolant passage part of the fourth bent plate 315 on the right side, the coolant passage part of the third bent plate 314, and the coolant passage part of the second baffle plate 313, it is cooled. In the state is discharged to the cutting oil outlet 130 of the main body 100.

As such, the cutting oil passes through the internal space 110 of the main body 100 while having a predetermined directionality, and thus heat exchange is performed. Therefore, all the cutting oil passing through the internal space 110 of the main body 100 is a heat exchange tube 320. ) And even heat exchange is achieved. Therefore, the cooling efficiency of the coolant is maximized. In addition, since the cutting oil has a long circulating flow path reciprocating the internal space 110 of the main body 100, the contact time with the heat exchange tube 320 is long, so that the cooling efficiency is further improved.

In the process of passing the cutting oil through the fifth baffle plate 316, foreign substances included in the cutting oil are collected into the lower end of the internal space 110 of the main body 100 through the cutting oil passing part of the fifth baffle plate 316. It is filtered by a plurality of micropores 317 formed in the baffle plate 316. The worker may periodically remove the foreign substances collected in the lower portion of the inner space 110 of the main body 100 through the foreign substance discharge pipe 365 to the outside periodically.

Therefore, there is no need to install a separate debris removal filter in the tank in which the coolant is stored, and the coolant circulates the heat exchanger because foreign matters contained in the coolant introduced immediately after the cutting process are filtered inside the heat exchanger before returning to the coolant tank. The problem of damaging the inside of the heat exchanger can be prevented.

In the case of winter, the cooling cassette 300b according to the second embodiment is used to replace. In this case, as shown in Figure 10, the cooling medium inlet pipe 600 from the air cooler 390 and the lower intermediate through the through-hole 200 formed in the right edge and the communication hole 382 of the lower cover 380 in turn The heat exchange tubes 320 are sequentially passed through the second communication groove 385a of the cover 385, and then pass through the left through flow path 200 through the cooling fluid discharge communication hole 385d of the lower middle cover 385. It has a series of cooling fluid circulation passage leading to the cooling fluid discharge pipe (700).

It looks at in detail the process of circulating cold air through the circulation passage as described above.

First, the cold air generated from the air cooler 390 is introduced into the right through-flow passage 200 formed at the right edge of the upper body cover 400 through the cooling fluid inlet pipe 600. The cold air introduced into the through passage 200 passes through the right connecting passage 410 of the upper body cover 400 and then passes through the cooling fluid inlet communication hole 382 of the lower cover 380 of the lower middle cover 385. It is moved to the cooling fluid inlet communication hole (385c) and the second communication groove (385b). The cold air moved to the second communication groove 385b rises along the heat exchange tube 320 and is adjacent to another heat exchanger through the first communication groove 355a of the upper middle cover 355 connected to the open upper portion of the heat exchange tube 320. It descends along the tube 320 and is moved to another adjacent heat exchange tube 320 through another second communication groove 385a connected to the open lower portion of the heat exchange tube 320. When the cold air all the single flow path formed by the heat exchange tubes 320 in this manner, the lower cover 380 through the cooling fluid discharge communication hole (385e) through the second communication groove (385d) forming the end of the single flow path It is moved to the left connection passage 510 of the lower body cover 500 via the communication hole 382 of the. The cold air introduced into the left connection passage 510 is raised through the left through passage 200 and discharged to the outside through the cooling fluid discharge pipe 700 installed in the upper body cover 400.

The cold air is heat-exchanged with the cutting oil circulating along the outside of the heat exchange tube 320 in a process of circulating the heat exchange tubes 320 to increase the temperature.

Although not shown, the cold air discharged to the outside is introduced through the cooling fluid inlet pipe 600 while being cooled again through a predetermined cooling cycle to repeat the above-described circulation.

As described above, since the cold air has a long circulation passage that continuously passes through the left and right sides of the main body 100 through the edge of the main body 100, the contact time with the cutting oil is long, and the heat exchange rate with the cutting oil is high.

On the other hand, the coolant is heat exchanged with the workpiece while the cold air repeats a series of cycles as described above to the cutting oil to the internal space 110 of the body 100 through the coolant inlet 120 of the main body 100 After flowing through the baffle plate assembly 310 or 800 and then discharged to the coolant outlet 130 of the main body 100, the circulation path of such cutting oil is the same as the circulation path of the cutting oil described above in the first embodiment. Detailed description will be omitted.

Although the present invention has been shown and described as a heat exchanger for cooling the cutting oil of a machine tool, the present invention is not necessarily limited thereto. Of course, the group can be applied.

As described above, preferred embodiments of the present invention are described above with reference to the drawings, but the present invention is not limited to the above-described embodiments, and those skilled in the art to which the present invention pertains can make modifications without departing from the spirit of the present invention. Possible, such modifications will fall within the scope of the invention.

1 is an assembled sectional perspective view showing a cutting oil heat exchanger of a conventional machine tool.

2 is a cross-sectional view of FIG.

Figure 3 is an assembled cross-sectional perspective view showing a cutting oil heat exchanger of the machine tool according to the present invention.

4 is an exploded perspective view of a part of a cutting oil heat exchanger of the machine tool according to the present invention.

5a and 5b is an external perspective view and a bottom perspective view of the upper body cover constituting the present invention, respectively

6 is an exploded perspective view of the cooling cassette of the present invention;

7 is a view showing a process of watertight between the body and the upper O-ring disc.

8 is an assembled sectional view of the cutting oil heat exchanger of the machine tool according to the present invention.

9 is an exploded perspective view showing another embodiment of the cooling cassette of the present invention.

10 is an assembled cross-sectional view of the present invention according to FIG.

11 is an exploded perspective view showing another embodiment of the baffle plate assembly constituting the present invention.

<Explanation of symbols for the main parts of the drawings>

100 ... body 110,350b ... inner space

120 Coolant inlet 130 Coolant discharge

200 ... through flow 300 ... cooling cassette

310,800 Baffle Plate Assembly 311,354,363,810

317,863 ... Micropore 320 ... Heat exchanger tube

322 Slotted nut 330 Upper ring

331,341 ... fitting hole 331a, 341a ... conical space part

333 Cone Packing 334 Secondary Packing

335,345 ... 1 annular groove 336,346 ... 2nd annular groove

337 ... O-ring 338 ... Slant spring

338a ... Incision 340 ... Bottom O-ring disc

350,370 ... Top cover 351,362 ... Round projection

352 Cooling fluid inlet 353 Cooling fluid outlet

355.Top middle cover 355a ... 1st communication groove

360,380 ... Bottom cover 364 ... Communicator

365 Foreign substance discharge pipe 385 Lower middle cover

385a ... 2nd communication groove 382 ... cooling fluid inlet communication hole

383.Cooling fluid exhaust communication hole 390 ... Air cooler

395 Vacuum generator 400 Upper body cover

410,510 Connection Euro 500 Lower Body Cover

600 ... cooling fluid inlet pipe 700 ... cooling fluid outlet pipe

801 ... heat exchange tube through hole 850

880 ... concave groove

Claims (16)

A main body 100 having a cutting oil discharge port 130 having a cylindrical inner space 110 having an upper and lower open side and heat exchanged with the cutting oil inlet port 120 to discharge the cutting oil whose temperature is increased; A plurality of through passages 200 crossing the upper and lower ends of the main body 100; The coolant flows in the internal space 110 of the main body 100 as a passage through which the coolant circulates, and the cutting oil introduced into the main body 100 through the cutting oil inlet 120 of the main body 100 is the main body ( Cooling cassette 300 for circulating the internal space of the 100 to form a cutting oil circulation flow path to be discharged through the cutting oil outlet 130; An upper body cover 400 fixed to an upper end of the main body 100 and having a connection passage 410 formed at an inner edge thereof to communicate the through passages 200 to complete a series of cooling fluid circulation passages; The lower body cover is fixed to the lower end of the main body 100, the inner side edge is formed with a connection passage 510 for communicating the through passage 200 and the cooling cassette 300 to complete a series of cooling fluid circulation passages ( 500); A cooling fluid inlet pipe 600 installed at the upper body cover 400 to introduce cooling fluid into the cooling cassette 300 or the through passage 200; And Cutting oil heat exchanger of the machine tool, characterized in that it comprises a cooling fluid discharge pipe 700 is installed in the upper body cover 400 to discharge the cooling fluid into the cooling cassette 300 or the through flow path (200). The method of claim 1, The cooling cassette 300 is A plurality of baffle plate assemblies 310 disposed at regular intervals, the cutting oil passages being formed in different directions such that the cutting oil introduced into the main body 100 circulates with a predetermined direction; A plurality of heat exchange tubes 320 passing through the cooling fluid inlet pipe 600 and passing through the baffle plate assembly; Upper and lower o-ring discs 330 and 340 fitted to the upper and lower ends of the heat exchange tubes 320, respectively; It is fastened to the upper end of the upper O-ring disc 330 while having an inner space (350b) in communication with the open upper end of the heat exchange tubes 320, the upper surface of the cooling fluid flowing from the cooling fluid inlet tube 600 Cooling fluid discharge holes 353 through which the cooling fluid is discharged are formed into the fluid inlet hole 352 and the cooling fluid discharge pipe 700, and the cooling fluid introduced through the cooling fluid inlet hole 352 in the internal space 350b. And an upper cover 350 in which an intermediate plate 354 is formed to partition the cooling fluid discharged through the cooling fluid discharge hole 353. And It is fastened to the lower end of the lower O-ring disc 340 while having an inner space in communication with the open lower end of the heat exchange tubes 320, the inner space on the same plane as the intermediate plate 354 of the upper cover 350 Formed intermediate plate 363 is provided, the side portion is a work characterized in that the lower cover 360 is formed with a communication hole 364 formed in communication between the inner passage and the connection passage 510 of the lower body cover 500 Coolant heat exchanger of the machine. The method of claim 1, The cooling cassette 300 is A baffle plate assembly 310 disposed at regular intervals and having a coolant passage portion formed in different directions such that the coolant introduced into the main body 100 circulates with a constant orientation; A plurality of heat exchange tubes 320 passing through the cooling fluid inlet pipe 600 and passing through the baffle plate assembly 310; Upper and lower o-ring discs 330 and 340 fitted to the upper and lower ends of the heat exchange tubes 320, respectively; An upper middle cover 355 positioned at an upper end of the upper o-ring disc 330 and having first communication grooves 355a communicating with an open upper end of a pair of adjacent heat exchange tubes 320 on an inner side thereof; An upper cover 370 fastened to an upper end of the upper O-ring disc 330 while having an inner space accommodating the upper middle cover 355; The second communication groove (385a) is located at the bottom of the lower O-ring disc 340, the inner side surface communicates the open lower end of the pair of heat exchange tubes 320 adjacent to the heat exchange tubes 320 to form a single flow path. Is formed, the side portion is connected to the through flow passage 200 connected to the cooling fluid inlet pipe 600, the connecting passage 510 of the lower body cover 500 and the second communication groove forming the start of the single channel (385b) Cooling fluid inlet communication hole (385c) to communicate with, the connection passage 510 of the lower body cover 500 in communication with the through-flow passage 200 connected to the cooling fluid discharge pipe 700 and the end of the single channel A lower middle cover 385 having a cooling fluid discharge communication hole 385e communicating with the second communication groove 385d; And Communication holes 382 that connect the cooling fluid inlet communication hole 385c of the lower middle cover 385, the cooling fluid discharge communication hole 385e, and the connection passage 510 of the lower body cover 500 and the lower part of the communication hole 382. Cutting oil heat exchanger of the machine tool, characterized in that consisting of a lower cover 380 fastened to the lower end of the lower O-ring disc 330 having an inner space for receiving the intermediate cover (385). The method of claim 3, Cutting oil heat exchanger of the machine tool, characterized in that the cooling fluid inlet pipe 600 is provided with an air cooler (390). The method according to claim 3 or 4, Cutting oil heat exchanger of the machine tool, characterized in that the cooling fluid discharge pipe 700 is further provided with a vacuum generator (395). 3. The method of claim 2, The coolant heat exchanger of the machine tool, characterized in that the cooling fluid is a cooling water. The method of claim 3, The coolant heat exchanger of the machine tool, characterized in that the cooling fluid is cold air. The method according to claim 2 or 3, The baffle plate assembly 310 includes an intermediate plate 311 for dividing the internal space 110 of the main body 100 into first and second quadrants on the left side and third and fourth quadrants on the right side, and the intermediate plate 311. The first baffle plate 312 is coupled to the upper end of the cutting fluid passage portion is formed in the first quadrant of the left rear and the heat exchange tube through-hole 301 is formed in the front, and the cutting oil passage portion is formed in the second and fourth quadrants A pair of second baffle plates 313 coupled to the intermediate plate 311 at a predetermined interval from below the baffle plate 312 and having heat exchange tube through-holes 301 formed thereon, and first and third quadrants; A pair of third baffle plates 314 which are respectively coupled to the intermediate plate 311 with a predetermined interval from below the second baffle plate 313 so that the cutting oil passage part is formed thereon and a heat exchange tube through-hole 301 is formed on the front surface thereof. ) And a predetermined interval from below the third baffle plate 314 so that the cutting oil passage portion is formed in the second and fourth quadrants. A pair of fourth baffle plates 315 respectively coupled to the plates 311 and having heat exchange tube through holes 301 formed thereon, and coupled to a lower end of the intermediate plate 311 and having a cutting oil passage formed in the first quadrant. And a fifth baffle plate 316 having a heat exchange tube through-hole 301 formed on the front surface thereof, The cutting oil inlet 120 is located above the first baffle plate 312, The coolant outlet 130 is a coolant heat exchanger of a machine tool, characterized in that located between the first baffle plate 312 and the second baffle plate (313). The method of claim 8, The fifth baffle plate 316 is further formed with a plurality of micropores 317 so that foreign matter contained in the cutting oil can be moved to the lower end of the inner space 110 of the main body 100, Cutting oil heat exchanger of the machine tool, characterized in that the lower O-ring disc 340 of the cooling cassette 300 is coupled to the foreign matter discharge pipe 365 for discharging the foreign matter passing through the fine hole 317 to the outside. The method of claim 2 or 3, The baffle plate assembly 800 includes an intermediate plate 810 for dividing the internal space 110 of the main body 100 into first and second quadrants on the left side and third and fourth quadrants on the right side, and the intermediate plate 810. It is fixed to the upper left end surface of the cutting oil passage portion is formed in the first quadrant and the heat exchange tube through-hole 801 formed on the front surface of the first baffle member 821 and the middle plate 810 is fixed to the upper right end surface of the heat exchange tube The first baffle plate 820 made of the second baffle member 822 having the through hole 801 and a predetermined interval from below the first baffle plate 820 so that the cutting oil passage part is formed in the second and fourth quadrants. A pair of second baffle plates 830 respectively coupled to the intermediate plate 810 and having a heat exchange tube through hole 801 formed thereon, and a second baffle plate to form a cutting oil passage in first and third quadrants. 830 is coupled to the intermediate plate 810 at a predetermined interval from the bottom of the heat exchange tube through hole 801 is formed in the front The pair of third baffle plate 840 and the second bent plate 840 are respectively coupled to the intermediate plate 810 with a predetermined distance from the bottom of the third baffle plate 840 so that the cutting oil passage part is formed. A pair of fourth baffle plate 850 having a through hole 801 formed thereon is fixed to a left side surface of the intermediate plate 810, and a coolant passage part is formed in one quadrant and a heat exchange tube through hole 801 is formed on the front surface thereof. A fifth baffle plate 860 formed of a third baffle member 861 and a fourth baffle member 862 fixed to a right side surface of the intermediate plate 810 and having a heat exchange tube through hole 801 formed on a front surface thereof, The cutting oil inlet 120 is located above the first baffle plate 820, The coolant outlet 130 is a coolant heat exchanger of a machine tool, characterized in that located between the first baffle plate 820 and the second baffle plate (830). The method of claim 10, A plurality of micropores 863 are further formed in the fifth baffle plate 860 to allow foreign substances contained in the cutting oil to move to the lower end of the internal space 110 of the main body 100. Cutting oil heat exchanger of the machine tool, characterized in that the lower O-ring disc 340 of the cooling cassette 300 is coupled to the foreign matter discharge pipe 365 for discharging the foreign matter that has passed through the fine hole (800c) to the outside. The method of claim 10, The first to fifth baffle plates 820 to 860 have at least one incision line 870 passing through the heat exchange tube through hole 801 to be divided and developed around the heat exchange tube through hole 801 formed on the front surface. Coolant heat exchanger for machine tools. The method of claim 12, Cutting oil heat exchanger of the machine tool, characterized in that the concave groove 880 is formed at the end of the incision line (870). The method of claim 2 or 3, The upper and lower O-ring discs (330, 340) Insertion holes 331 and 341 to which the top and bottom of the heat exchange tubes 320 are fitted are formed. The hole nuts 332 are fastened to the fitting holes 331 and 341 so as to be in close contact with both ends of the heat exchange tube 320. Cutting oil heat exchanger of the machine tool, characterized in that the watertight packing is located between the hole nut (332) and both ends of the heat exchange tube (320). 15. The method of claim 14, Cone spaces 331a and 341a are formed in the fitting holes 331 and 341. Cone packing 333 to be fitted to the conical space (331a, 341a) and the conical packing 333 and the hole nut 332 is located between the hole nut 332 is fastened to the fitting holes (331, 341) When the concave packing 333 is in close contact with the conical packing 333 by being pushed by the hole nut 332 to enter the fitting holes (331,341) is composed of an auxiliary packing (334) in close contact with the conical space (331a, 341a) Coolant heat exchanger of the machine tool, characterized in that. The method of claim 2 or 3, The upper and lower O-ring discs 330 and 340 have first annular grooves 335 and 345 formed on side surfaces and second annular grooves 336 and 346 formed at upper and lower edges thereof so as to communicate with the first annular grooves 335 and 345. The first annular grooves 335 and 345 are fitted with a pair of inclined springs 338 disposed to face each other with the O-rings 337 positioned at the center thereof. In the lower and upper portions of the upper and lower covers 350 and 360, the inclined springs are formed through the second annular grooves 336 and 346 of the upper and lower o-ring discs 330 and 340 in the process of being fastened to the upper ends of the upper and lower o-ring discs 330 and 340. Cutting oil heat exchanger of the machine tool, characterized in that the annular projection (351,362) for pressing the 338 to elastically deform the inclined spring (338) to be in close contact with the inner surface of the main body (100).

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